KR20120083234A - Crawler stretch adjusting device - Google Patents

Abstract

PURPOSE: A caterpillar stretch regulation device is provided to prevent the inflow of foreign materials in a feeding valve mounting portion. CONSTITUTION: A caterpillar stretch regulation device regulates the stretch of a caterpillar by being installed between an idler wheel and a driving wheel. The caterpillar stretch regulation device comprises a valve mounting hole(30) and a feeding valve(31). The valve mounting hole is formed in a grease passage(29) and composed of a female screw hole(30A) and a cylinder hole(30B). The female screw hole is formed in a rod body(25). The cylinder hole is formed in a rod fitting cylinder(26c). The feeding valve comprises a male thread(35), a hook shaped groove, and a seal ring(39). The male thread is coupled with the female screw hole. The hook shaped groove is formed in the rear side behind the male thread portion. The seal ring is mounted in a ring forming groove. The seal ring seals the gap of the exterior of a feeding valve body(32) and the interior of the cylindrical hole of the valve mounting hole.

Description

Caterpillar stretch adjustment device {CRAWLER STRETCH ADJUSTING DEVICE}

The present invention relates to a crawler stretch adjusting device suitably used for crawler-type vehicles provided with crawlers, such as hydraulic excavators and hydraulic cranes, for example.

In general, a hydraulic excavator as a representative example of a construction machine includes a crawler type lower traveling body that can be self-contained, an upper swinging body mounted so as to pivot on the lower traveling body, and the upper swinging body. Consists of a work device installed so that it can float.

In this case, the lower traveling body of the hydraulic excavator includes a track frame having left and right side frames extending in the front and rear directions, and a flow wheel provided on one end of the side frame so as to be able to move forward and backward through the yoke. And an endless track provided between the flow wheel and the drive wheel, and an endless track stretch adjusting device provided between the side frame and the flow wheel to adjust the stretch of the endless track. .

Here, the caterpillar stretch adjusting device includes a tube disposed in the side frame, a yoke-side rod in which the proximal end is slidably inserted in the tube and the proximal side protrudes to the yoke side, and the proximal end is a tube. A frame side rod fitted in the inner side and protruding to the opposite side from the yoke, a spring member provided between the tube and the yoke or between the tube and the side frame, a grease chamber formed in the tube by the yoke side rod and the frame side rod, and the frame A grease passage provided at the side rod, one end of which is opened to the outer circumferential surface of the frame side rod, and the other end of which communicates with the grease chamber, a valve mounting hole provided at one end of the grease passage, and a paper feeder attached to the valve mounting hole ( I) It is provided with a valve (for example, refer patent document 1).

When the endless track is deformed due to the ups and downs of the road surface during travel of the hydraulic excavator, the yoke moves forward and backward with the flow wheel along the expansion and contraction of the spring member. As a result, the distance between the flow wheel and the drive wheel is appropriately changed in accordance with the deformation of the endless track, thereby adjusting the tension of the endless track and protecting the flow wheel and the drive wheel.

On the other hand, when grease is injected by connecting a feed tool such as a grease gun to the feed valve, grease flows into the grease chamber through the grease passage, whereby the frame side rod or yoke side rod extends from the tube. Thereby, the stretch of the endless track wound by the flow wheel and the drive wheel can be strengthened. In addition, when the feed valve is loosened, the grease in the grease chamber is discharged to reduce the frame side rod or the yoke side rod in the tube. This can weaken the stretch of the endless track wound around the flow wheel and the drive wheel.

Japanese Utility Model Publication No. 2-117277

By the way, in the crawler stretch adjusting apparatus by a prior art, the inner side of a valve mounting hole becomes a female thread hole, and the opening end side of a valve mounting hole becomes a cylindrical hole larger in diameter than the said female screw hole. On the other hand, a male screw portion is provided on the outer circumferential surface of the feed valve, and the feed valve is fixed to the frame side rod by spirally inserting the male screw portion into the female screw hole of the valve mounting hole. Therefore, in a state where the feed valve is mounted on the frame side rod, an annular gap is formed between the feed valve and the cylindrical hole of the valve mounting hole over the entire circumference.

For this reason, when the hydraulic excavator performs work in mud etc., mud water etc. penetrate into a valve mounting hole, and the male screw part of a feed valve or the female screw hole of a valve mounting hole becomes rusty. As a result, there is a problem that the feed valve is attached to the valve mounting hole, and the workability at the time of loosening or tightening the feed valve in order to perform the crawl adjustment of the crawler track is reduced. In addition, there is a problem that the life of the feed valve is reduced by premature corrosion of the feed valve.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a crawler stretch adjusting device capable of preventing muddy water or the like from entering a valve mounting hole for mounting a paper feed valve.

MEANS TO SOLVE THE PROBLEM In order to solve the subject mentioned above, this invention provides the tube arrange | positioned in the side frame which comprises a construction machine, the yoke side rod in which the base end side was slidable in the said tube, and the front end side protruded to the yoke side, and the base end. A frame side rod having a side fitted into the tube and a tip side protruding to the opposite side to the yoke, a grease chamber formed in the tube by the base end of the yoke side rod and the base end of the frame side rod, and the frame side rod. A grease passage in which one end is opened to the outer circumferential surface of the frame-side rod and the other end is in communication with the grease chamber, and an end portion of the grease passage is provided in one end of the grease passage and the inner end is a female screw hole. A valve mounting hole that is a cylindrical hole having a diameter larger than that of a female thread hole, and a paper feed screwed to the valve mounting hole in a spiral manner. Applied to the caterpillar stretch adjustment device provided with a valve.

A feature of the invention of claim 1 is that the feed valve is provided with a cylindrical feed valve body whose inner circumferential side is a grease supply passage, and is provided in the middle of a supply passage of the feed valve body, and grease is externally supplied from the supply passage. A check valve mechanism for preventing the flow of water, and a male screw portion provided on the front outer peripheral surface of the feed valve body in the spiral insertion direction to the valve mounting hole and spirally inserted into the female screw hole of the valve mounting hole; Corresponding to the cylindrical hole of the valve mounting hole, the annular groove provided on the outer peripheral surface of the rear side of the feed valve body in the spiral insertion direction from the male screw portion is fitted to the annular groove, and the male screw portion is mounted on the valve. When the screw is inserted into the female threaded hole of the hole, the outer circumferential surface of the feed valve body and the valve mounting hole It is configured as a sealing ring to seal between the inner peripheral surface of the cylindrical hole.

According to a second aspect of the present invention, in the male screw portion of the feed valve, the grease in the grease chamber is moved outward when the male screw portion is loosened from the female screw hole of the valve mounting hole and the seal ring is separated from the cylindrical hole of the valve mounting hole. The grease discharge groove for discharging is provided.

According to a third aspect of the present invention, the frame-side rod is provided with a release preventing member that prevents the feed valve from falling out of the valve mounting hole when the male screw portion is loosened from the female screw hole of the valve mounting hole. .

The invention of claim 4 is configured to provide a movement restricting portion on the outer circumferential side of the feed valve body in contact with the release preventing member to regulate the movement amount of the feed valve when the sealing ring is separated from the cylindrical hole of the valve mounting hole. It is in one thing.

According to the invention of claim 1, in order to mount the feed valve in the valve mounting hole of the frame side rod, the feed screw male thread is mounted in the annular groove of the feed valve body in a state of spirally inserted into the female screw hole of the valve mounting hole. By sealing, it is possible to seal between the outer circumferential surface of the feed valve body and the inner circumferential surface of the cylindrical hole of the valve mounting hole. For this reason, for example, even when a construction machine works in mud etc., it can suppress that mud water invades a valve mounting hole by sealing, and the male screw part of a feed valve, the female screw hole of a valve mounting hole, etc. Can prevent rusty. As a result, the feed valve can be prevented from adhering to the valve mounting hole, and the workability at the time of loosening or tightening the feed valve in order to perform the caterpillar stretch adjustment can be improved. In addition, the feed valve can be prevented from prematurely corroding and its life can be extended.

According to the invention of claim 2, the male threaded portion of the feed valve is loosened from the female threaded hole of the valve mounting hole, and the seal ring attached to the annular groove is detached from the cylindrical hole of the valve mounting hole, whereby the grease in the grease chamber is removed. It can be discharged to the outside through the grease discharge groove of the feed valve. In this way, since the grease can be discharged to the outside using the grease discharge groove of the feed valve, there is no need to provide a dedicated discharge passage for discharging grease to the frame side rod, and accordingly, the caterpillar stretch adjusting device Can reduce the production cost.

According to the invention of claim 3, when the male threaded portion of the feed valve is loosened in order to discharge the grease in the grease chamber, the release preventing member prevents the feed valve from being pulled out from the valve mounting hole. As a result, the feeding valve can be prevented from inadvertently falling off from the valve mounting hole, and the loss of the feeding valve can be prevented.

According to the invention of claim 4, when the sealing valve installed in the feeding valve is released from the cylindrical hole of the valve mounting hole by loosening the feeding valve, the movement restricting member contacts the release preventing member to regulate the amount of movement of the feeding valve. can do. As a result, it can suppress that a feed valve becomes loose more than necessary, and the workability at the time of spirally inserting a feed valve into a valve mounting hole can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the hydraulic excavator to which the crawler stretch adjustment apparatus which concerns on 1st Embodiment was applied.
FIG. 2 is an enlarged front view of the lower traveling body in FIG. 1. FIG.
3 is a cross-sectional view illustrating an interior of one side portion of the side frame of FIG. 2.
4 is a cross-sectional view of the crawler stretch adjusting device according to the first embodiment as seen from arrow IV-IV direction in FIG. 3.
FIG. 5 is a cross-sectional view of an enlarged view of an essential part showing an enlarged frame side rod, a grease passage, a valve mounting hole, a feed valve, a seal ring, and the like in FIG. 4.
It is sectional drawing of the same position as FIG. 5 which shows the state which the sealing ring separated from the valve mounting hole.
Fig. 7 is an external view showing a feed valve equipped with a seal ring.
FIG. 8 is a cross-sectional view of the feed valve and the sealing in the direction of arrow VIII-VIII in FIG. 7; FIG.
9 is an exploded perspective view illustrating a frame side rod, a feed valve, a seal ring, a valve release preventing plate, and the like.
It is sectional drawing of the same position as FIG. 3 which shows the crawler stretch adjustment apparatus which concerns on 2nd Embodiment.
FIG. 11 is a cross-sectional view of the crawler stretch adjusting device according to the second embodiment as seen from the arrow XI-XI direction in FIG. 10.
It is sectional drawing of the principal part enlargement which expands and shows the frame side rod, the grease channel | path, the valve mounting hole, the feed valve, the sealing ring, etc. in FIG.

EMBODIMENT OF THE INVENTION Hereinafter, the case where the embodiment of the crawler stretch adjustment apparatus which concerns on this invention is applied to the lower traveling body of a hydraulic excavator is demonstrated in detail according to an accompanying drawing.

First, Figs. 1 to 9 show a first embodiment of the present invention. In FIG. 1, 1 is a hydraulic shovel, and the said hydraulic excavator 1 is a crawler-type lower traveling body 2 which can be used frequently, and the upper part mounted so that it may turn on the said lower traveling body 2. It consists of the revolving body 3 and the work device 4 which is provided so that it can float and float in the front side of the said upper revolving body 3, and performs excavation work of earth and sand etc. substantially. As shown in FIG. 2, the lower traveling body 2 includes a track frame 5, a flow wheel 10, a driving wheel 11, an endless track 13, an endless track stretch adjusting device 21, and the like described later. It consists of.

5 is a track frame constituting the lower traveling body 2, and the track frame 5 includes a center frame 6 on which the upper swing body 3 can pivot and the center frame 6. It is provided in the left and right both sides, and is comprised by the left and right side frames 7 extended in the front and back directions (only the right side is shown).

Here, as shown in FIG. 3 etc., the side frame 7 is an angled cylinder which is enclosed by the upper board 7A, the lower board 7B, the inner board 7C, the outer board 7D, etc., and extends forward and backward. Formed. In addition, a work opening 7E is formed in the outer side plate 7D of the side frame 7 near one side in the front and back directions, and the work opening 7E is an endless track stretch adjusting device (to be described later) ( It is an opening for performing the operation | work which connects a paper feed tool (not shown), such as a grease gun, to the feed valve 31 of 21). In addition, a thick support plate 7F is fixed to the inside of the side frame 7, and a holder mounting hole fitted to the support plate 7F by the holder 26 of the frame side rod 24 to be described later ( 7G) is formed.

8 has shown the flow ring bracket provided in the one end side of the side frame 7 front and back. The flow wheel bracket 8 includes a flange plate 8A joined to an end of the side frame 7 by welding or the like, and a flow wheel 10 protruding forward from the flange plate 8A and described later. In order to support, it consists of the inner support board 8B opposing in the left-right direction, the outer support board 8C, and the upper connection board 8D which integrally connected the upper part of each of these support boards 8B, 8C. In addition, the flange plate 8A is provided with a through hole 8E through which the yoke 9 to be described later and the like are loosely inserted. The yoke described later is provided on the inner surface side of each of the support plates 8B and 8C. Guide portions 8F and 8G for guiding sliding of 9 in the forward and backward directions are provided extending in the front and rear directions.

9 is a yoke provided in the flow wheel bracket 8, and the said yoke 9 is arrange | positioned so that it can move forward and backward along the guide part 8F, 8G of the flow wheel bracket 8, and is the flow wheel 10 mentioned later. ) To be able to move forward and backward.

In this case, the yoke 9 has a bifurcated shape from the annular spring receiving portion 9A receiving one end side of the spring member 27 to be described later and the spring receiving portion 9A, as shown in FIG. 4. It is formed in V shape by the left arm part 9B and the right arm part 9C which branched to the whole. The inner circumferential side of the spring receiving portion 9A is a rod insertion passage hole 9D through which the yoke-side rod 23 to be described later slides so as to slide, and the tip portions of the left and right arm portions 9B and 9C. The bearing part 10B of the flow wheel 10 mentioned later is attached, respectively.

Denoted at 10 is one side of the side frame 7 and shows a flow wheel supported in the flow wheel bracket 8 so as to be rotatable. A support shaft 10A extending in the left and right directions is provided at the center of the flow wheel 10, and both ends of the support shaft 10A can rotate on the left and right bearing portions 10B (only the right side). Is supported. The left and right bearing portions 10B are attached to the distal ends of the left and right arm portions 9B and 9C of the yoke 9 using bolts. As a result, the flow wheel 10 can move forward and backward along the guide portions 8F and 8G of the flow wheel bracket 8 together with the yoke 9.

11 is a drive wheel provided on the other end side of the side frame 7 via the drive wheel bracket 12 at the other end side, The said drive wheel 11 is comprised by the sprocket etc. Then, the drive wheel 11 is rotated by a hydraulic motor (not shown) for travel, thereby causing the crawler to be described later.

13 is an endless track that is wound and mounted between the flow wheel 10 and the drive wheel 11. The crawler 13 is guided by the upper rollers 14 on the upper side of the side frame 7, and guided by the lower rollers 15 on the lower side of the side frame 7. In addition, the caterpillar 13 rotates and drives the drive wheels 11, thereby circulating between the drive wheels 11 and the flow wheels 10, and stably runs the hydraulic excavator 1 even in uneven ground or the like. It is to let.

Next, the tracked stretch adjusting device according to the first embodiment provided between the side frame 7 and the flow wheel 10 will be described.

21 represents the crawler stretch adjusting device provided in the side frame 7, and the crawler stretch adjusting device 21 adjusts the stretch of the crawler 13 between the flow wheel 10 and the driving wheel 11. It is. Here, the crawler stretch adjusting device 21 includes a tube 22, a yoke side rod 23, a frame side rod 24, a spring member 27, a grease chamber 28, and a grease passage 29 which will be described later. And the valve mounting hole 30, the feed valve 31, the valve release preventing plate 42, and the like.

22 is a tube which extends in the front-back direction in the side frame 7, and the said tube 22 is formed in the cylindrical shape with a step as a whole. Here, the inner circumferential side of the tube 22 becomes the rod insertion passage part 22A, and is located on the other side (drive wheel 11 side) in the front and rear directions on the outer circumferential side of the tube 22 and has a flange-shaped spring receiving portion ( 22B) is integrally formed.

23 is a yoke-side rod provided on one side of the tube 22 in the front and rear directions and protrudes toward the yoke 9. The yoke-side rod 23 has a proximal end of the rod insertion passage of the tube 22. It consists of the cylindrical rod main body 23A fitted so that it may slide in the state which prevents it from slipping into 22A, and the nut 23C which spirally couples to the male screw part 23B provided on the front-end | tip of the said rod main body 23A. have.

Here, the front end side of the rod main body 23A is inserted through the rod insertion passage hole 9D provided in the spring receiving portion 9A of the yoke 9 so as to be slidable (movable). The spring receiving portion 9A is prevented from coming off by the nut 23C that is screwed into the male screw portion 23B of the rod main body 23A. Moreover, the nut 23C is prevented from loosening by the loosening prevention member 23D provided in the front-end | tip part of 23 A of rod main bodies. Thus, the yoke side rod 23 and the yoke 9 are integrated, and the front end side of the yoke side rod 23 is inserted and moved so that it can move to the rod insertion passage hole 9D of the yoke 9.

24 is a frame side rod which is provided on the other side in the front and rear directions of the tube 22 and protrudes toward the side opposite to the yoke 9 (the supporting plate 7F side of the side frame 7). ) Is a cylindrical rod main body 25 in which the proximal end is slidably fitted to the rod insertion passage 22A of the tube 22, and means such as press-fitting are used at the distal end side of the rod main body 25. The holder 26 is integrally mounted.

Here, as shown in FIG.5 and FIG.9, the holder 26 has the plate-shaped contact plate part 26A which forms a square shape, and the bottom protruding in one side end surface 26B of the said contact plate part 26A. It consists of a cylindrical rod fitting cylinder part 26C with a hollow, and the hollow tapered mounting protrusion part 26E which protruded in the other end surface 26D of the contact plate part 26A, and is comprised by the holder 26. By inserting the front end side of the rod main body 25 in the press-fit state into the rod fitting cylinder portion 26C, the frame side rod 24 in which the rod main body 25 and the holder 26 are integrated is formed.

The holder 26 of the frame-side rod 24 is fitted to the holder mounting hole 7G of the support plate 7F provided in the side frame 7 to the side frame 7 by fitting the mounting protrusion 26E. It is set as the structure supported by the said support plate 7F in the state which was positioned and the other end surface 26D of the contacting board part 26A abuts on the support plate 7F. In addition, one side end face 26B of the contact plate portion 26A constituting the holder 26 is provided with a spiral threaded hole 26F for mounting the valve release preventing plate 42 described later (see FIG. 9). ).

27 shows a spring member provided between the tube 22 and the spring receiving portion 9A of the yoke 9. This spring member 27 consists of a coiled compression spring, and is contractively mounted between the spring receiving portion 22B of the tube 22 and the spring receiving portion 9A of the yoke 9. And the spring member 27 applies the spring bearing part 9A of the yoke 9 to the nut 23C of the yoke-side rod 23 at all times, and the flow ring 10 supported by the yoke 9 is carried out. ) Is pressurized in the direction away from the drive wheel 11.

That is, the crawler stretch adjusting device 21 constantly presses the flow wheel 10 in the direction away from the drive wheels 11 by the spring force of the spring member 27, thereby suitable for the crawler 13. Stretch is given. For example, when the caterpillar 13 is deformed due to the ups and downs of the ground during traveling of the hydraulic excavator 1, the spring member 27 is bent and deformed so that the distance between the flow wheel 10 and the driving wheels 11 is reduced. Is changed suitably, and it is set as the structure which can suppress that an excessive load (tension) acts on the track 13.

28 is a grease chamber formed in the tube 22, and the grease chamber 28 forms a boundary between the yoke side rod 23 and the frame side rod 24. The grease chamber 28 is supplied or disposed with grease passages 29 or the like described later, and the tubes 22 of the frame-side rods 24 are supplied in accordance with the amount of grease to be filled in the grease chamber 28. The amount of protrusion from is adjusted.

29 is a grease passage provided in the frame side rod 24, and the said grease passage 29 is open at the one end side in the outer peripheral surface of the rod fitting cylinder part 26C of the holder 26, and the other end side of the holder 26 is carried out. The radial passage 29A extending through the rod fitting tube portion 26C in the radial direction of the rod main body 25 and the central portion of the rod main body 25 in the axial direction, and one end side is the radial passage 29A. ) And the other end side is constituted by an axial passage 29B in communication with the grease chamber 28. In this case, the valve mounting hole 30 mentioned later is provided in one end side of 29 A of radial paths, and the valve seat 29C which tapered in the boundary part of 29 A of radial paths and the valve mounting hole 30 is tapered. ) Is formed.

30 represents a valve mounting hole provided at one end side of the grease passage 29, and the valve mounting hole 30 is formed concentrically with the radial passage 29A of the grease passage 29 and described later. 31 is mounted. Here, the valve mounting hole 30 is formed over the rod main body 25 and 26 C of the rod fitting cylinder part of the holder 26 which comprise the frame side rod 24, as shown to FIG. 5 and FIG. 30 A of female threaded holes located on the inner side and installed in the rod main body 25, and a hole having a diameter larger than that of the female threaded holes 30A located on the opening end side and installed in the rod fitting tube portion 26C of the holder 26. It is comprised by the cylindrical hole 30B. The screw feed hole 31 is attached to the valve mounting hole 30 by helically coupling the male threaded portion 35 of the feed valve 31 to be described later to the female screw hole 30A of the valve mounting hole 30. It is.

Next, the paper feed valve attached to the valve mounting hole 30 is demonstrated.

In other words, 31 denotes a feeding valve mounted in the valve mounting hole 30 provided on the other end side of the grease passage 29, and the feeding valve 31 supplies grease into the grease chamber 28 of the tube 22. At this time, a paper feed tool (not shown) such as a grease gun is connected, and grease filled in the grease chamber 28 is held in the grease chamber 28. Here, as shown in FIGS. 7 to 9, the feed valve 31 includes a feed valve body 32, a nipple 33, a check valve mechanism 34, a male screw part 35, The grease discharge groove 36, the annular groove 38, the seal ring 39, and the stopper portion 40 are substantially constituted.

32 is a feed valve main body forming the outer shell of the feed valve 31. The feed valve main body 32 is formed in a cylindrical shape with a stage as a whole, and a supply path 32A through which grease flows is formed on the inner circumferential side thereof. . In addition, an inlet port 32B having a hole larger in diameter than the supply passage 32A is provided at one end in the axial direction of the feed valve body 32, and the inlet port 32B is provided with a grease gun or the like. A nipple 33 serving as a connection port is spirally mounted.

On the other hand, on the other end side of the feed valve main body 32 in the axial direction, an outlet 32C having a hole having a diameter larger than that of the supply passage 32A and which grease flows out is provided, and a check valve described later in the outlet 32C. The mechanism 34 is provided. Moreover, the other end part of the feed valve main body 32 is provided with the seat surface 32D which protrudes in a taper shape, and the said seat surface 32D is 29 A of radial paths of the grease channel 29, and a valve mounting hole. It seats on the valve seat 29A formed in the boundary part of 30. As shown to FIG.

34 is a check valve mechanism provided in the outlet 32B of the feed valve main body 32, and the check valve mechanism 34 seats at the valve seat 32E formed in the boundary between the supply passage 32A and the outlet 32B. This is composed of a spherical valve body 34A for closing the supply passage 32A and a spring 34B for applying a force toward the valve seat 32E. The check valve mechanism 34 prevents the flow of grease from the outlet 32C of the feed valve body 32 toward the inlet 32B, thereby preventing the grease from flowing out from the supply passage 32A to the outside. will be.

35 represents a male thread portion provided on the outer circumferential surface of the other end side of the feed valve body 32, that is, the outer circumferential surface of the front side of the spiral insertion direction to the valve mounting hole 30, and the male screw portion 35 represents the valve mounting hole 30. The spiral thread is inserted into the female threaded hole 30A. Therefore, the feed valve 31 is inserted into the valve mounting hole 30 by spirally inserting the male threaded portion 35 into the female threaded hole 30A of the valve mounting hole 30, so that the sheet of the feed valve body 32 is closed. The surface 32D is configured to be fixed to the valve mounting hole 30 by seating on the valve seat 29A formed at the boundary between the radial passage 29A of the grease passage 29 and the valve mounting hole 30. (See FIG. 5).

36 is a grease discharge groove provided in the male screw part 35, and the said grease discharge groove 36 is the other end side of the feed valve main body 32 in which the male screw part 35 was formed, as shown in FIG. The outer peripheral surface is cut out to form a recess groove extending in the axial direction. Therefore, as shown in FIG. 6, the male screw part 35 of the feed valve 31 is loosened from the female screw hole 30A of the valve mounting hole 30, and the seat surface 32D of the feed valve main body 32 is removed. And the grease in the grease chamber 28 is valve-mounted from the grease passage 29 through the grease discharge groove 36 from the grease passage 29 and the valve seat 29A at the boundary of the valve mounting hole 30. It is led to the cylindrical hole 30B of the hole 30, and is discharged | emitted to the exterior from the said cylindrical hole 30B.

37 is a tool catching part provided in the outer peripheral surface of the one end side of the feed valve main body 32, The said tool catching part 37 is formed in the hexagonal plate shape of thick thickness. The tool catching portion 37 catches a tool such as a spanner when tightening or loosening the male screw portion 35 of the feed valve 31 with respect to the female screw hole 30A of the valve mounting hole 30. It is.

Next, reference numeral 38 denotes an annular groove provided on the outer circumferential surface of the feed valve body 32 corresponding to the cylindrical hole 30B of the valve mounting hole 30. The annular groove 38 is arranged in the feed valve body 32 in the rear side of the screw insertion direction than the male screw portion 35, and cuts out the outer circumferential surface of the feed valve body 32 into the required shape over its entire circumference. It is formed as a whole circumferential groove.

39 denotes a seal ring fitted to the annular groove 38, and the seal ring 39 is formed into a ring-shaped circular cross section using a rubber material having excellent oil resistance, for example. (38) is fitted with an appropriate tightening value. Here, as shown in FIG. 5, the feed valve 31 is attached to the valve mounting hole 30, and the seat surface 32D of the feed valve main body 32 has the grease path 29 and the valve mounting hole 30 here. In the state seated on the valve seat 29A of the boundary portion of), the seal ring 39 abuts elastically on the inner circumferential surface of the cylindrical hole 30B of the valve mounting hole 30. As a result, the seal ring 39 seals between the outer circumferential surface of the feed valve body 32 of the feed valve 31 and the inner circumferential surface of the valve mounting hole 30, and muddy water or the like penetrates into the valve mounting hole 30. Stop doing it.

On the other hand, as shown in FIG. 6, the feed valve 31 is loosened from the valve mounting hole 30, and the seat surface 32D of the feed valve main body 32 forms the grease passage 29 and the valve mounting hole 30. As shown in FIG. In the state separated from the valve seat 29A of the boundary part of (), the sealing ring 39 is separated from the cylindrical hole 30B of the valve mounting hole 30 to the outside. As a result, the grease in the grease chamber 28 is led from the grease passage 29 to the cylindrical hole 30B of the valve mounting hole 30 through the grease discharge groove 36, and from the cylindrical hole 30B. It is discharged to the outside.

40 is a stopper part as a movement restricting part provided on the outer circumferential side of the feed valve main body 32, and the stopper part 40 is formed in the same hexagonal plate shape as the tool catching part 37, and the tool catching part 37 It is arrange | positioned between and the annular groove 38, and is provided. The stopper member 40 and the tool engaging portion 37 face each other at intervals in the axial direction, and a valve release preventing plate 42 to be described later is inserted between the stopper member 40 and the tool engaging portion 37. The space 41 is formed. The stopper portion 40 abuts against the valve release prevention plate 42 when the feed valve 31 is loosened from the valve mounting hole 30.

Next, reference numeral 42 denotes a valve release prevention plate as a release prevention member provided on the frame side rod 24. This valve release prevention plate 42 prevents the supply valve 31 from being pulled out of the valve mounting hole 30 when the supply valve 31 is loosened. In this case, as shown in FIG. 9, the valve release preventing plate 42 has a rectangular mounting plate portion 42A facing one end face 26B of the holder 26 constituting the frame-side rod 24. And a rectangular contact affixed to the mounting plate portion 42A and extending in the up and down directions and inserted into the space 41 between the tool catching portion 37 and the stopper portion 40 of the feed valve 31. It consists of the board part 42B. Moreover, 42 C of bolt insertion passage holes through which the bolt 43 mentioned later penetrate is provided in 42 A of mounting board parts. On the other hand, on the lower end side of the contacting plate portion 42B, a two-pronged cutout portion 42D caught between the tool catching portion 37 and the stopper portion 40 on the outer circumferential surface of the feed valve body 32. ) Is formed.

Then, the valve release prevention plate 42 inserts the bolt 43 into the bolt insertion hole 42C of the mounting plate portion 42A, and passes the bolt 43 through the female thread hole 26F of the holder 26. Helix insertion is attached to one end surface 26B of the holder 26. In this state, the abutting plate portion 42B of the valve release preventing plate 42 is inserted into the space 41 between the tool engaging portion 37 and the stopper portion 40 of the feed valve 31 and abuts. The cutout part 42D of the plate part 42B is caught by the outer peripheral surface of the feed valve 31 (feed valve main body 32) in the space 41.

Here, as shown in FIG. 5, the feed valve 31 is attached to the valve mounting hole 30, and the seat surface 32D of the feed valve main body 32 has the grease path 29 and the valve mounting hole 30 here. In the state seated at the valve seat 29A of the boundary portion of (), a gap L is formed between the stopper portion 40 of the feed valve 31 and the abutting plate portion 42B of the valve release preventing plate 42. have. On the other hand, as shown in FIG. 6, by loosening the feed valve 31, while the seat surface 32D of the feed valve main body 32 falls from the valve seat 29A, the sealing ring 39 is a valve mounting hole. When separated from the cylindrical hole 30B of 30, the stopper part 40 of the feed valve 31 abuts against the contact plate part 42B of the valve release prevention plate 42. As shown in FIG. Thereby, it becomes the structure by which the movement amount at the time of loosening the feed valve 31 is regulated.

The crawler stretch adjusting device 21 according to the first embodiment has the configuration as described above, and the operation thereof will be described next.

First, as shown in FIG. 5, the feed valve 31 is fixed to the valve mounting hole 30, and the seat surface 32D of the feed valve body 32 is a grease passage 29 (diameter passage). 29A) and the valve seat 29A formed at the boundary between the valve mounting hole 30. In this state, the sealing ring 39 of the feed valve 31 abuts elastically on the inner circumferential surface of the cylindrical hole 30B constituting the valve mounting hole 30. Moreover, the stopper part 40 of the feed valve 31 is spaced apart from the contact plate part 42B of the valve release prevention plate 42 attached to the holder 26 of the frame side rod 24 at intervals L. As shown in FIG. Face to face.

In this way, the sealing ring 39 attached to the annular groove 38 of the feed valve 31 is elastically abutted against the inner circumferential surface of the cylindrical hole 30B constituting the valve mounting hole 30, thereby supplying the paper. The sealing ring 39 can seal the liquid from leaking between the outer circumferential surface of the feed valve body 32 constituting the valve 31 and the inner circumferential surface of the valve mounting hole 30. Therefore, even when the hydraulic excavator 1 works in the muddy water, the muddy water or the like is reliably prevented from entering the valve mounting hole 30, and the male screw part 35 and the valve mounting hole ( The female screw hole 30A of 30 can be prevented from rusting. As a result, the feed valve 31 can be prevented from adhering to the valve mounting hole 30, and workability at the time of loosening or tightening the feed valve 31 in order to perform the stretch adjustment of the crawler 13 is performed. Can increase. In addition, the feed valve 31 can be prevented from prematurely corroding, and the life thereof can be extended.

Next, in the case where the tension of the crawler 13 is increased by the crawler stretch adjusting device 21, grease is supplied into the grease chamber 28 of the tube 22 to thereby supply the frame side rod to the tube 22. The amount of protrusion of (24) is increased.

In this case, a grease gun (not shown) is inserted into the working opening 7E opened in the outer plate 7D of the side frame 7, and the grease gun is connected to the nipple 33 of the feed valve 31. do. Here, the feed valve 31 is attached to the valve mounting hole 30 formed concentrically with the radial passage 29A of the grease passage 29, and orthogonal to the front and rear directions of the side frame 7. It is arranged in a state. For this reason, since the feeding valve 31 is installed by arranging the nipple 33 toward the working opening 7E, the operator simply inserts the grease gun directly into the working opening 7E and nipples the grease gun. It is possible to easily and reliably connect to (33).

In this way, by discharging grease from the grease gun while the grease gun is connected to the nipple 33 of the feed valve 31, the grease is supplied to the supply passage 32A of the feed valve 31 and the frame side rod. The grease chamber 28 in the tube 22 is filled through the grease passage 29 provided in the 24. Thereby, the frame side rod 24 can be extended from the tube 22 according to the amount of grease filled in the grease chamber 28, and the flow wheel 10 is moved from the drive wheel 11 via the yoke 9. By moving in the direction of separation, the tension of the crawler 13 can be increased.

On the other hand, in the case where the tension of the crawler 13 is weakened by the crawler stretch adjusting device 21 in order to perform maintenance work on the crawler 13, the grease chamber 28 is filled. By discharging the grease, the frame rod 24 is reduced in the tube 22.

In this case, as shown in FIG. 6, the feed valve 31 is loosened from the valve mounting hole 30, and the seat surface 32D of the feed valve main body 32 is made into the grease channel 29 and the valve mounting hole. The sealing ring 39 of the feed valve 31 is detached from the cylindrical hole 30B of the valve mounting hole 30 to the outside while being separated from the valve seat 29A at the boundary portion 30. Thereby, the grease in the grease chamber 28 is led from the grease passage 29 to the cylindrical hole 30B of the valve mounting hole 30 through the grease discharge groove 36, and from the cylindrical hole 30B. Can be discharged to the outside. Thereby, the frame side rod 24 can be reduced in the tube 22 according to the amount of grease discharged from the grease chamber 28, and the flow wheel 10 is connected to the drive wheel 11 via the yoke 9. By moving in the approaching direction, the tension of the crawler 13 can be weakened.

In this way, by loosening the feed valve 31, the grease filled in the grease chamber 28 can be discharged to the outside through the grease discharge groove 36 formed in the male threaded portion 35. It is not necessary to provide a dedicated discharge passage for discharging to the frame side rod 24, and the manufacturing cost of the crawler stretch adjustment apparatus 21 can be reduced by that.

On the other hand, as shown in FIG. 6, when the sealing ring 39 of the feed valve 31 has moved outward from the cylindrical hole 30B of the valve mounting hole 30, the stopper part 40 of the feed valve 31 is carried out. ) Abuts against the abutting plate portion 42B of the valve release preventing plate 42 attached to the holder 26 of the frame-side rod 24, thereby restricting the amount of movement when the feed valve 31 is loosened. have. As a result, the feed valve 31 can be loosened more than necessary and fall off from the valve mounting hole 30, and the loss of the feed valve 31 can be prevented. Moreover, workability at the time of spirally inserting the loose feed valve 31 back into the valve mounting hole 30 can be improved.

Next, FIGS. 10-12 show 2nd Embodiment of this invention, The characteristic of this embodiment is that the front end side of a yoke-side rod abuts on a yoke, and the front end side of a frame side rod is a support plate of a side frame. It is inserted so that it can move, and a spring member is provided between the tube and the support plate of a side frame. In addition, in 2nd Embodiment, the same code | symbol is attached | subjected to the component same as 1st Embodiment mentioned above, and the description is abbreviate | omitted.

50 shows the flow wheel used for 2nd Embodiment, and the said flow wheel 50 is 50 A of support shafts extended in the left-right direction to the center part like the flow wheel 10 which concerns on 1st Embodiment. ) Is provided, and both end sides of the support shaft 50A are rotatably supported by the left and right bearing portions 50B (only the right side is shown). In this case, as for the bearing part 50B of the flow wheel 50, compared with the bearing part 10B of the flow wheel 10 which concerns on 1st Embodiment, the dimension of the front and back direction is formed shortly, This bearing part 50B is attached to the front-end | tip of the arm part 53A of the yoke 53 mentioned later using a bolt.

51 represents a side frame used in the second embodiment, and the side frame 51 is moved forward and backward by an upper plate 51A, a lower plate 51B, an inner plate 51C, an outer plate (not shown), or the like. It is formed as an angular cylinder extended to the inside, and the working opening 51D is formed in the outer side board. In addition, a thick support plate 51E is fixed to the inside of the side frame 51, and a rod insertion passage hole through which the front end side of the frame-side rod 57 to be described later is inserted into the support plate 51E. 51F is formed.

52 is a flow wheel bracket according to the second embodiment provided on one end side of the side frame 51, and the flow wheel bracket 52 is flanged in substantially the same manner as the flow wheel bracket 8 according to the first embodiment described above. The board 52A, the inner support plate 52B, the outer support plate (not shown), the upper connecting plate 52C, the through hole 52D, and the guide portions 52E and 52F are roughly constituted.

53 represents a yoke according to the second embodiment provided in the flow wheel bracket 52, and the yoke 53 is disposed left and right with the flow wheel 50 interposed therebetween, and the guide portion 52F of the flow wheel bracket 52, A through hole formed in the flange plate 52A of the flow ring bracket 52 which connects between the left and right arm parts 53A (right side only) and the respective arm parts 53A so as to be able to slide on the 52G). It is formed in U shape as a whole by the connection part 53B extended into the side frame 51 via 52D). The left and right bearing portions 50B of the flow wheel 50 are attached to the front ends of the left and right arm portions 53A of the yoke 53. In this case, since the bearing part 50B of the flow wheel 50 is formed shorter than the bearing part 10B of the flow wheel 10 which concerns on 1st Embodiment, the arm parts (left and right) of the yoke 53 ( 53A) is formed longer than the arm part 9B, 9C of the left and right of the yoke 9 which concerns on 1st Embodiment. Moreover, the engaging recessed part 53C in which the projection part 56C of the holder 56B mentioned later is attached to the connection part 53B of the yoke 53 is provided.

Next, the tracked stretch adjusting device according to the second embodiment provided between the side frame 51 and the flow wheel 50 will be described.

54 denotes a crawler stretch adjusting device provided inside the side frame 51, and the crawler stretch adjusting device 54 adjusts the stretch of the crawler 13 between the flow wheel 50 and the driving wheel 11. It is. Here, the caterpillar stretch adjusting device 54 includes a feed valve 31, a tube 55, a yoke side rod 56, a frame side rod 57, a spring member 61, and a grease chamber 62 which will be described later. ), A grease passage 63, a valve release preventing plate 65, and the like.

55 is a tube which extends in the front-back direction in the side frame 51, and the inner peripheral side of the said tube 55 is the rod insertion passage part 55A. Further, a flange-shaped spring receiver 55B is integrally formed on one end portion outer circumferential side of the tube 55.

56 is a yoke-side rod provided on one side of the tube 55 in the front and rear directions and protrudes toward the yoke 53. The yoke-side rod 56 has a proximal end with a rod insertion passage of the tube 55. It consists of the cylindrical rod main body 56A fitted so that it can slide to 55A, and the holder 56B integrally attached to the front-end | tip side of the said rod main body 56A by means of press-fitting, etc. In the holder 56B, a projection 56C that is engaged with the locking recess 53C of the yoke 53 is provided. The holder 56B of the yoke-side rod 56 abuts on the connecting portion 53B of the yoke 53 in a state where the protruding portion 56C is caught by the locking recess 53C of the yoke 53. .

57 is a frame side rod which is provided on the other side of the tube 55 in the front and rear directions and protrudes toward the side opposite to the yoke 53 (the side of the support plate 51E of the side frame 51). ) Is a cylindrical rod main body 58 in which the proximal end is slidably fitted to the rod insertion passage 55A of the tube 55, and a male screw 58A is formed at the distal end side, and the rod main body 58. It consists of the nut 59 spirally mounted to the male screw 58A of the (). Moreover, the screw hole 58B for attaching the valve release prevention plate 65 mentioned later is formed in the front end surface of the rod main body 58. As shown in FIG.

60 is a disc-shaped spring receiving plate having a step provided on an outer circumferential side of the rod main body 58 of the frame-side rod 57, and the spring receiving plate 60 is fitted so that the rod main body 58 can slide. It consists of 60 A of cylindrical parts, and 60 B of disk parts enlarged in diameter centering on 60 A of said cylindrical parts. In addition, the spring receiving plate 60 is maintained by the nut 59 attached to the male thread 58A of the frame side rod 57 in the fall prevention state. And the spring receiving plate 60 is a disk part to the said support plate 51E in the state which inserted the cylindrical part 60A through the rod insertion hole 51F formed in the support plate 51E of the side frame 51. It is making contact with 60B. Therefore, the front end side of the frame side rod 57 is inserted through the spring receiving plate 60 so that the support plate 51E of the side frame 51 can move forward and backward.

61 shows a spring member provided between the tube 55 and the support plate 51E of the side frame 51. The spring member 61 is made of a coiled compression spring, and is contracted between the spring receiving portion 55B of the tube 55 and the disc portion 60B of the spring receiving plate 60 abutting on the supporting plate 51E. It is installed. The spring member 61 presses the tube 55 toward the yoke 53 at all times to pressurize the flow wheel 50 supported by the yoke 53 in the direction away from the driving wheel 11. It is to give an appropriate stretch to the caterpillar (13).

62 is a grease chamber formed in the tube 55, and the grease chamber 62 forms a boundary between the yoke side rod 56 and the frame side rod 57. The grease chamber 62 is supplied or discharged with grease through a grease passage 63, described later, and the tube 55 of the yoke-side rod 56 in accordance with the amount of grease to be filled in the grease chamber 62. The amount of protrusion from is adjusted.

63 is a grease passage provided in the frame side rod 57. The grease passage 63 has one end opening at an outer circumferential surface of the nut 59, and the other end side passes through the nut 59 to form a rod main body 58. The radial passage 63A extending in the radial direction of the rod and the central portion of the rod main body 58 extend in the axial direction, and one end side communicates with the radial passage 63A, and the other end side communicates with the grease chamber 62. It consists of one axial passage 63B. In this case, the valve mounting hole 64 mentioned later is provided in the one end side of 63 A of radial paths, and the valve seat 63C which tapered in the boundary part of 63 A of radial paths and the valve mounting hole 64 is tapered. ) Is formed.

64 represents a valve mounting hole provided at one end side of the grease passage 63, and the valve mounting hole 64 is formed concentric with the radial passage 63A of the grease passage 63, and the feed valve 31 is provided. ) Is mounted. Here, the valve mounting hole 64 is formed over the rod main body 58 and the nut 59 constituting the frame side rod 57, and is located on the inner part side and is provided with a female screw hole 64A provided in the nut 59. ) And a cylindrical hole 64B formed on the nut 59 with a hole located at the open end side and having a larger diameter than the female screw hole 64A. Then, by screwing the male threaded portion 35 of the feed valve 31 into the female threaded hole 64A of the valve mounting hole 64, the feed valve 31 is mounted in the valve mounting hole 64. .

Next, reference numeral 65 designates a valve release prevention plate as a release prevention member provided on the frame side rod 57. The valve release preventing plate 65 prevents the feeding valve 31 from falling out of the valve mounting hole 64 when the feeding valve 31 is loosened. In this case, as shown in FIG. 12, the valve release prevention plate 65 folds a rectangular metal plate in an L shape to bend the long mounting plate portion 65A to be the proximal side and the short to be the proximal side. It is formed by the contact plate portion 65B. Moreover, 65 C of bolt insertion passage holes are provided in the base end side of the mounting plate part 65A, and the feed valve main body (B) between the tool engaging part 37 and the stopper part 40 is provided in the upper end side of the contact plate part 65B. The semicircular arc-shaped cutout part 65D which hangs on the outer peripheral surface of 32 is formed.

The valve release prevention plate 65 is a screw hole of the rod main body 58 through the spacer 67 through the bolt 66 inserted through the bolt insertion hole 65C of the mounting plate portion 65A. It is attached to the frame side rod 57 by fastening to 58B). In this state, the abutting plate portion 65B of the valve release preventing plate 65 is inserted into the space 41 between the tool catching portion 37 and the stopper portion 40 of the feed valve 31 and abuts. The cutout part 65D of the plate part 65B is caught by the outer peripheral surface of the feed valve 31 (feed valve main body 32) in the space 41.

Here, the feed valve 31 is attached to the valve mounting hole 64, and the seat surface 32D of the feed valve main body 32 has a valve seat at the boundary between the grease passage 63 and the valve mounting hole 64. While seating at 63C, the sealing ring 39 is disposed in the cylindrical hole 64B of the valve mounting hole 64, the stopper portion 40 and the valve release preventing plate 65 of the feed valve 31 are closed. The space | interval L is formed between the contact board parts 65B of ().

On the other hand, by loosening the feed valve 31, the seat surface 32D of the feed valve body 32 is separated from the valve seat 63C, and the sealing ring 39 is formed in the cylindrical hole of the valve mounting hole 64. When separated from the outside 64B, the stopper portion 40 of the feed valve 31 abuts against the abutting plate portion 65B of the valve release preventing plate 65. Thereby, the movement amount at the time of loosening the feed valve 31 is regulated, and it is set as the structure which can prevent the feed valve 31 from loosening more than necessary and falling out from the valve mounting hole 64. As shown in FIG.

The crawler stretch adjusting device 54 according to the second embodiment has the configuration as described above, and also in the crawler stretch adjusting device 54, the annular groove 38 of the feed valve 31 is provided. The provided seal ring 39 elastically contacts the inner circumferential surface of the cylindrical hole 64B constituting the valve mounting hole 64, so that the seal ring 39 is provided with the outer circumferential surface of the feed valve body 32 constituting the feed valve 31. The sealing ring 39 can seal the liquid between the inner circumferential surfaces of the valve mounting hole 64 without leaking. Therefore, even when the hydraulic excavator 1 works in the muddy water, the muddy water or the like is reliably prevented from entering the valve mounting hole 64, and the male screw portion 35 and the valve mounting hole of the feed valve 31 are prevented. 64A of female thread holes of 64 can be prevented from rusting. As a result, the feed valve 31 can be prevented from adhering to the valve mounting hole 64, and the workability at the time of loosening or tightening the feed valve 31 in order to perform the stretch adjustment of the crawler 13 is performed. Can increase. In addition, the feed valve 31 can be prevented from prematurely corroding, and the life thereof can be extended.

In addition, in each embodiment mentioned above, the case where the O ring formed in the annular shape with circular cross section shape is used as the seal ring 39 attached to the feed valve 31. As shown in FIG. However, this invention is not limited to this, For example, you may use other sealing rings, such as a square ring of cross-sectional square shape and the X-shaped ring of cross-sectional X shape.

In addition, in each embodiment mentioned above, the case where the one grease discharge groove 36 extended in the axial direction is provided in the male screw part 35 of the feed valve 31 is illustrated. However, this invention is not limited to this, For example, it is good also as a structure which provides a some grease discharge groove with the suitable space | interval at the circumferential direction of the male screw part 35. FIG.

In addition, in each embodiment mentioned above, the tracked stretch adjusting apparatuses 21 and 54 used for the lower traveling body 2 of the hydraulic excavator 1 are demonstrated as an example. However, this invention is not limited to this, For example, it can apply widely to the vehicle which has a crawler-type lower traveling body, such as a hydraulic crane and a bulldozer.

1: Hydraulic Shovel (Construction Machinery) 2: Lower Traveling Body
7, 51: side frame 7F, 51E: support plate
9, 53: yoke 10, 50: flow ring
11: drive wheel 13: caterpillar
21, 54: caterpillar stretch adjustment mechanism
22, 55: tube 23, 56: yoke side rod
24, 57: frame side rod 27, 61: spring member
28, 62: grease chamber 29, 63: grease passage
30, 64: Valve mounting hole 30A, 64A: Female thread hole
30B, 64B: Cylindrical hole 31: Feed valve
32: feed valve body 34: check valve mechanism
35: male thread portion 36: grease discharge groove
38: ring-shaped groove 39: sealing
40: stopper part (moving control part)
42, 65: valve release prevention plate (release prevention member)

Claims (4)

A tube disposed in the side frame constituting the construction machine, a yoke side rod fitted with a proximal end so as to slide in the tube, and a proximal end protruding to the yoke side, and a proximal end fitted into the tube and the proximal end being the yoke. And a grease chamber formed in the tube by the frame side rod protruding to the opposite side, the base end of the yoke side rod and the base end of the frame side rod, and one end side of the frame side rod, A valve passage having an opening and the other end communicating with the grease chamber, and a valve hole provided at one end of the grease passage and having an inner part side as a female screw hole, and an opening end side as a cylindrical hole having a diameter larger than the female screw hole. A caterpillar stretch comprising a bore and a feed valve mounted in a spiral coupling with the valve mounting hole. In the adjusting device,
The feed valve includes a cylindrical feed valve main body having an inner circumferential side serving as a grease supply passage, a check valve mechanism provided in the middle of the supply passage of the feed valve main body, and preventing grease from flowing out from the supply passage. A male screw portion provided on the front outer peripheral surface of the feed valve body in the spiral insertion direction to the valve mounting hole and spirally inserted into a female screw hole of the valve mounting hole, and corresponding to the cylindrical hole of the valve mounting hole; Of the feed valve main body of the feed valve body when the annular groove provided on the outer peripheral surface of the rear side in the spiral insertion direction of the male screw portion is fitted to the annular groove, and the male screw portion is spirally inserted into the female screw hole of the valve mounting hole. Seal sealing between outer peripheral surface and inner peripheral surface of cylindrical hole of said valve mounting hole Caterpillar stretch adjustment apparatus that is configured as characterized. The method of claim 1, wherein
The male screw portion of the feed valve has a grease discharge groove for discharging grease in the grease chamber to the outside when the male screw portion is loosened from the female screw hole of the valve mounting hole and the seal ring is separated from the cylindrical hole of the valve mounting hole. A crawler stretch adjusting device that is configured to be installed. The method according to claim 1 or 2,
The frame-side rod is configured to be provided with a release preventing member that prevents the feed valve from falling out of the valve mounting hole when the male screw portion is loosened from the female screw hole of the valve mounting hole. The method of claim 3,
An endless track stretch formed on the outer circumferential side of the feed valve main body is provided with a movement restricting portion that contacts the release preventing member and regulates the movement amount of the feed valve when the seal ring is separated from the cylindrical hole of the valve mounting hole. Adjustment device.

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