JP2008302745A - Hydraulic piping structure for crawler type working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic piping structure for a crawler type working machine capable of preventing interference, such as rubbing of hydraulic hoses and interlacing with other members, even when expansion/contraction movement amount of crawler frames is large, while preventing damage to a protecting tube. <P>SOLUTION: In the crawler type working machine, the pair of right and left crawler frames 7R, 7L having crawlers 9 fitted to the outer peripheries, respectively are provided on both right and left sides of a truck frame 1 so as to be movable between an expansion position and a contraction position, and a plurality of hydraulic hoses are arranged from the truck frame 1 to the respective crawler frames 7R, 7L. Between the truck frame 1 and the respective crawler frames 7R, 7L, the protecting tube 26 bendable to each one face side are arranged in the extended state to the vehicle width direction while being bent astride two upper and lower stages. One end of the protecting tube 26 positioned on the upper stage side is fixed to the truck frame 1, and the other end of the protecting tube 26 positioned on the lower stage side is connected to the crawler frame via a joint member 40 so as to enable angle displacement. The plurality of hydraulic hoses are inserted into the protecting tube 26 and arranged. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hydraulic piping structure of a crawler type work machine such as a crawler crane or a hydraulic excavator, and more particularly to a structure in which hydraulic hoses are arranged from a track frame of a lower traveling body to left and right crawler frames.

  In general, a lower traveling body such as a crawler crane is provided on a left side and a right side of a track frame 101 (also referred to as a car body) 101 that supports an upper turning body as shown in FIGS. 27 and 28, for example. A pair of left and right crawler frames 102, 102, a crawler 104 mounted on the outer periphery of each crawler frame 102 via a drive sprocket 103 and an idler, and a traveling hydraulic motor 105 that rotationally drives the drive sprocket 103 are provided. Yes.

  In such a lower traveling body, the distance between the crawler centers can be expanded in order to increase the stability during the work, and the distance between the crawler centers can be reduced in relation to laws and regulations when transporting the work machine by the trailer. It may be. For example, as shown in FIG. 27, a bendable arm member 107 is provided at the tip of each axle 106 of the track frame 101, and a telescopic hydraulic cylinder 108 is provided between the track frame 101 and each crawler frame 102. Each crawler frame 102 is supported by a contracted position brought close to the base end side of each axle 106 of the track frame 101 and an arm member 107 extended from the distal end of each axle 106 of the track frame 101 by the expansion and contraction operation of the hydraulic cylinder 108. For example, it may be configured to be movable between the extended positions.

  Further, a plurality of hydraulic hoses 111, 111,... For rotating the motor forward and reverse and operating an attached brake are connected to the traveling hydraulic motor 105. In the case where 111, 111,... Are arranged from the central portion of the track frame 101 to the traveling hydraulic motor 105 provided at the rear end portion of the crawler frame 102, conventionally, the same traveling hydraulic motor as shown in FIGS. Each hydraulic hose 111 connected to 105 is bundled with a bundling band 112 or the like, and is extended along the rear side surface of the rear axle 106 and the inner side surface of the rear portion of the crawler frame 102 from the center portion of the track frame 101. A hydraulic piping structure is employed in which the metal fittings 113 and the like are appropriately fixed.

  However, in the above-described conventional hydraulic piping structure, when the crawler frame 102 is moved between the contracted position and the expanded position, the hydraulic hose 111 is greatly bent and rubs between the hydraulic hoses 111 and 111 bundled together with a binding band 112 or the like. There are problems such as wear and entanglement with other members. In particular, in the case of a large crawler crane or the like, this problem is remarkable because the amount of expansion / contraction change of the crawler center distance, that is, the amount of expansion / contraction movement of the crawler frame 102 is large.

On the other hand, as a case suitable for arranging cables such as cables and hoses between a moving part and a stationary part of an industrial machine, for example, a protective tube (cable protection guide as disclosed in Patent Document 1). Devices or cable bears (registered trademark) are also known. This protective tube is formed by connecting a large number of rectangular link frames so as to be elongated and bendable on one side, and houses and arranges cables therein.
JP 2006-3000271 A

  Therefore, the present inventor firstly expanded and contracted the crawler frame by effectively using the protective tube as described above when arranging a plurality of hydraulic hoses from the track frame of the lower traveling body to the left and right crawler frames, respectively. A hydraulic piping structure of a crawler type work machine that can prevent interference such as friction between hydraulic hoses and entanglement with other members even when the amount is large has been devised. In other words, the proposed hydraulic piping structure is arranged between the track frame and each crawler frame in a state extending in the vehicle width direction while bending a protective tube that can be bent on one surface side over two stages. The upper end of the protective tube is fixed to the track frame, the other end of the lower protective tube is fixed to the crawler frame, and a plurality of hydraulic hoses are arranged through the protective tube. Is.

  However, when the lower end of the protective tube is fixed to the crawler frame with a bolt or the like as in the above-mentioned idea, the track frame may be used when jacking up the track frame side with the attached transformer lifter cylinder during expansion / contraction work of the crawler frame. Due to a gap in the opening of the crawler frame where the axle is inserted, or when the track frame and the crawler frame are displaced in the vertical direction, or when the crawler frame is expanded and contracted by the expansion / contraction hydraulic cylinder If the frame swings on a horizontal plane due to uneven weight of the front and rear portions, an excessive bending load is applied to the fixed portion, and the protective tube may be damaged.

  The present invention has been made in view of such various points, and the problem is that the crawler frame can be expanded and contracted by effectively using the protective tube by further improving the above-described idea. Even if it is large, it prevents interference such as rubbing between hydraulic hoses and entanglement with other members, and breaks the protection tube due to bending load acting on the connection between the protection tube and the crawler frame during expansion / contraction of the crawler frame It is an object of the present invention to provide a hydraulic piping structure for a crawler type work machine that can prevent this from occurring.

  In order to solve the above-described problems, the invention according to claim 1 is characterized in that a pair of left and right crawler frames that mount crawlers on the outer circumference on both the left and right sides of the track frame minimizes the extended position that maximizes the distance between crawler centers In a crawler type work machine that is provided so as to be movable between a reduced position and a plurality of hydraulic hoses are arranged from the track frame to each crawler frame, one surface is provided between the track frame and each crawler frame. A protective tube that can be bent to the side is arranged in a state extending in the vehicle width direction while bending over two upper and lower stages, and one end located on the upper stage side of this protective pipe is fixed to the track frame, while the lower stage of the protective pipe The other end located on the side is connected to the crawler frame via a joint member so as to be angularly displaceable. To construction of arranging through. Here, the angular displacement is meant to include both angular displacement around one axis and angular displacement around one point.

  In this configuration, when the crawler frame moves between the expansion position and the contraction position with respect to the track frame, the protective tube disposed between the both frames is connected to the upper end, which is a fixed end of the track frame, and the crawler frame. The lower end is merely displaced with the movement of the crawler frame while changing the position of the curved portion between the lower end and the connecting end with the plurality of hydraulic pressures arranged in the protective tube. The hoses do not rub against each other nor entangle with other members. In addition, since the lower end of the protective tube is connected to the crawler frame via a joint member so that it can be angularly displaced, an excessive bending load acts on the above-mentioned connecting portion when the crawler frame is expanded or contracted. Neither does it cause damage to the protective tube.

  The invention according to claim 2 provides a preferable specific form of the joint member in the hydraulic piping structure of the crawler work machine according to claim 1. That is, the joint member is a first member fixed to the lower end of the protective tube, a second member fixed to the crawler frame, and one end of which is one of the first and second members. A third member coupled to the other of the first and second members so as to be capable of relative rotational displacement about the horizontal axis in the front-rear direction. To do. Here, the vertical axis means one axis extending in the substantially vertical direction, and the horizontal axis means one axis extending in the substantially horizontal direction.

  In this configuration, since the joint member is simply connected by connecting the three members with a vertical axis or a horizontal axis in the front-rear direction (specifically, a pin or the like), it can be implemented at low cost. it can. In addition, the lower end of the protective tube is connected to the crawler frame so that it can be displaced relative to both the vertical axis and the front-rear horizontal axis. It is possible to reliably prevent the protective tube from being damaged due to an excessive bending load acting on the connecting portion.

  According to a third aspect of the present invention, in the hydraulic piping structure of the crawler type work machine according to the second aspect, the joint member is provided such that the length in the vehicle width direction is adjustable. In this configuration, since the length of the joint member in the vehicle width direction is adjustable, it is possible to absorb assembly errors and adjust the tension of the hydraulic hose, which is effective for assembly work.

The invention according to claim 4 is the hydraulic piping structure of the crawler type work machine according to claim 3,
A preferred mode for enabling adjustment of the length of the joint member in the vehicle width direction is provided. That is, a through-hole through which the vertical axis passes is provided at a predetermined interval along the vehicle width direction in either the third member of the joint member or the first or second member coupled to the third member around the vertical axis. A configuration is provided in which a plurality are provided in a row for each. In this configuration, the length in the vehicle width direction of the joint member can be easily and reliably adjusted by selecting one through hole from the plurality of through holes and penetrating the vertical shaft.

  The invention according to claim 5 is the hydraulic piping structure of the crawler type work machine according to any one of claims 2 to 4, wherein the third member of the joint member is coupled to the third member around the horizontal axis. A through hole through which the horizontal axis passes is formed in either one of the first or second members formed in a long hole shape so as to allow the vertical displacement of the horizontal axis. In this configuration, the through hole through which the horizontal axis passes is formed in a long hole shape to allow the horizontal axis to be displaced in the vertical direction, so the lower end of the protective tube is connected to the crawler frame via the joint member. In addition to being able to be used for height adjustment, the bending load around the horizontal axis can be applied flexibly to the load by the vertical displacement of the horizontal axis along with the rotational displacement around the horizontal axis. It is possible to prevent the damage of the battery more reliably.

  As described above, according to the hydraulic piping structure of the crawler type work machine in the present invention, when the crawler frame moves between the expansion position and the contraction position with respect to the track frame, the protective tube disposed between the both frames is Since the lower end, which is the connecting end with the crawler frame, is only displaced with the movement of the crawler frame while changing the position of the curved portion, the plurality of hydraulic hoses arranged in the protective tube are mutually connected. There is no strong rubbing or entanglement with other members, and these interferences can be reliably prevented. In addition, since the lower end of the protective tube is connected to the crawler frame via a joint member so that it can be angularly displaced, an excessive bending load acts on the above-mentioned connecting portion when the crawler frame is expanded or contracted. No breakage of the protective tube can be prevented.

  In particular, in the invention according to claim 2, the joint member is a simple joint in which three members are simply connected to each other by a vertical axis or a horizontal axis in the front-rear direction, and the relative angular displacement is made around both the vertical axis and the horizontal axis in the front-rear direction. Since it is possible, it can be implemented at a low cost, and the protection tube can be surely prevented from being damaged, which is advantageous for implementation.

In the invention which concerns on Claim 3, since the vehicle width direction length of a joint member is provided so that adjustment is possible,
Absorption of assembly errors and tension adjustment of the hydraulic hose can be performed, which can contribute to the efficiency of assembly work.

  In the invention according to claim 4, the length in the vehicle width direction of the joint member can be easily and reliably adjusted by selecting one through hole from among the plurality of through holes and penetrating the vertical shaft. This is very advantageous for implementation.

  Further, in the invention according to claim 5, since the through-hole through which the horizontal shaft passes is formed in a long hole shape so as to allow the horizontal shaft to be displaced in the vertical direction, the lower end of the protective tube is connected to the joint member. It can be used for height adjustment when connecting to the crawler frame via the horizontal axis, and when the bending load around the horizontal axis is applied, it responds flexibly to the load by the vertical displacement of the horizontal axis along with the rotational displacement around the horizontal axis As a result, it is possible to prevent damage to the protective tube more reliably.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments that are the best mode for carrying out the present invention will be described below with reference to the drawings.

  1 to 3 show a lower traveling body of a crawler type work machine equipped with a hydraulic piping structure according to an embodiment of the present invention, and 1 is a track frame (also referred to as a car body) that supports an upper turning body. The center portion of the track frame 1 is formed by connecting the upper plate 2 and the lower plate 3 with a plurality of vertical plates 4, 4,... A mounting seat 5 is provided, and an upper swing body is rotatably supported on the mounting seat 5 with a swing bearing (not shown) interposed therebetween. In addition, the track frame 1 has a total of four axles 6, 6,... Each extending in the vehicle width direction outward from the center at two front and rear locations, and each axle 6 has a rectangular closed cross-sectional structure. Has been.

  A pair of left and right crawler frames 7L and 7R extending in the front-rear direction are provided on the left and right sides of the track frame 1, respectively, and a drive sprocket and idler (both not shown) are provided on the outer periphery of the crawler frames 7L and 7R. The crawler 9 is attached via the lower roller 8 or the like. Each crawler frame 7L, 7R is provided with rectangular openings 10, 10 penetrating in the vehicle width direction (left-right direction) at two front and rear positions corresponding to the two front and rear axles 6, 6 of the track frame 1, respectively. The crawler frames 7L and 7R are attached to the left and right sides of the track frame 1 with the two axles 6 and 6 of the track frame 1 passing through the openings 10 and 10, respectively.

  Between the central portion of the track frame 1 and the crawler frames 7L and 7R, a total of four telescopic hydraulic cylinders 11 in total, two front and rear extending in the vehicle width direction on both front and rear sides sandwiching each protective tube 16 described later. , 11,... Are provided by the hydraulic cylinders 11, 11,. It is provided to be movable between. Here, in FIG. 1, the left crawler frame 7 </ b> L is located at the contracted position, and the right crawler frame 7 </ b> R is located at the expanded position.

  As shown in FIGS. 4 to 7, the opening 10 of each of the crawler frames 7L and 7R has a vertical dimension that is the same as that of the axle 6 in order to make it easier to move relative to the axle 6 of the track frame 1. The gap δ having a predetermined dimension is formed between the upper surface of the axle 6 and the upper wall surface of the opening 10. A shim 12 made of a rectangular metal plate is inserted into the gap δ so as to fix the axle 6 and the crawler frames 7L and 7R. When the crawler frames 7L and 7R are in the extended position, the shim 12 is fixed to the bracket 13 attached to the front end surface of the axle 6 by pin connection as shown in FIGS. 4 and 5, and the crawler frames 7L and 7R are in the contracted position. In some cases, as shown in FIGS. 6 and 7, it is fixed to a bracket 15 attached to the outer end surface of the upper plate 14 of the crawler frames 7L and 7R by pin connection.

  Further, although not shown in the drawings, a drive sprocket and a traveling hydraulic motor that rotationally drives the crawler frames 7L and 7R are provided at the rear ends of the crawler frames 7L and 7R. 8, four hydraulic hoses 21, 22, 23, and 24 per vehicle, that is, two hydraulic hoses 21 and 22 for rotating the motor in the forward or backward direction, and a motor A hydraulic hose 23 for operating a brake attached to the vehicle and a drain hydraulic hose 24 are connected. These hydraulic hoses 21 to 24 are swivel joints arranged at the center of the mounting seat 5 of the track frame 1. 25 is disposed across the track frame 1 and the crawler frames 7L and 7R of the lower traveling body from the lower end of 25.

  In arranging the hydraulic hoses 21 to 24, as a characteristic point of the present invention, a protective tube 26 that can be bent to one surface side is provided between the central portion of the track frame 1 and the crawler frames 7L and 7R. Is arranged in a state extending in the vehicle width direction while curving over two upper and lower stages, and the four hydraulic hoses 21 to 24 are arranged through the protective tube 26. Further, the four hydraulic hoses 21 to 24 are all first parts 21 a to 24 a from the lower end of the swivel joint 25 to be introduced into the protective pipe 26, and the second parts 21 b arranged in the protective pipe 26. To 24b and third portions 21c to 24c arranged along the crawler frames 7L and 7R. Hereinafter, these structures will be described with reference to FIG.

  That is, as shown in FIGS. 19 to 22, the protective tube 26 is formed by connecting a large number of rectangular link frames 31, 31,... The link frame 31 has a pair of left and right link plates 32, 32, a connecting plate 33 on the curved inner peripheral side formed integrally with or fixed to the link plates 32, 32, and one end thereof. The link frame 32 is connected to one link plate 32 so as to be pivotable and the other end is connected to the other link plate 32 so as to be engageable with the other link plate 32. The connecting plate 34 is opened, and the second portions 21b to 24b of the hydraulic hoses 21 to 24 are inserted and arranged therein. The second portions 21b to 24b of the hydraulic hoses 21 to 24 arranged in the protective tube 26 are made of a member such as flexible rubber.

  One end located on the upper side of the protective tube 26 is provided with a bracket 37 and the like on a support rod 36 laid on the upper plate 2 of the track frame 1 as shown in enlarged detail in FIGS. 8, 9, 11 and 13. The portion where the bracket 37 is fixed to the support rod 36 is located almost directly below the swivel joint 25. The first portions 21a to 24a of the hydraulic hoses 21 to 24 are made of metal or the like, and do not interfere with each other from the swivel joint 25 to one end of the protective tube 26, as shown in detail in FIGS. Arranged while curving appropriately.

  On the other hand, the other end located on the lower side of the protective tube 26 can be angularly displaced via a joint member 40 at the lower part of the inner plate of each crawler frame 7L, 7R, as shown in enlarged detail in FIGS. It is connected to. The joint member 40 includes a first member 42 made of a substantially triangular flat plate fixed to the other end (that is, the lower end) of the protective tube 26 by screws 41 at a plurality of locations (four locations in the figure), and a crawler. The second member 44 fixed to the frames 7L and 7R by two bolts (two locations in the figure) with bolts 43 and one end (inner end) can be displaced relative to the first member 42 around the vertical axis 45 by a relative angle. The other end (outer end) is composed of a third member 47 coupled to the second member 44 so as to be capable of relative angular displacement about the horizontal axis 46 in the front-rear direction.

  The second member 44 of the joint member 40 includes a fixed portion 44a fixed to the inner plate of the crawler frames 7L and 7R, and extends inward from the fixed portion 44a and has a predetermined gap in the front-rear direction. And a pair of extending portions 44b, 44b facing each other. Further, the third member 47 of the joint member 40 is inserted between the pair of extending portions 44b, 44b of the second member 44, and is coupled with the horizontal shaft 46 and supported by the first coupling portion 47a. An intermediate plate portion 47b having a lower portion fixed to the first coupling portion 47, and a pair of second coupling portions 47c and 47c fixed to the upper portion of the intermediate plate portion 47b and facing each other with a predetermined gap in the vertical direction. The distal end portion of the first member 42 is inserted between the pair of second coupling portions 47c, 47c and coupled and supported by the vertical shaft 45. Each second coupling portion 47c of the third member 47 is provided with a plurality of (three in the figure) through holes 48 in a row at predetermined intervals along the vehicle width direction. One of these is used. Further, in each extending portion 44 b of the second member 42, a through hole 49 through which the horizontal shaft 46 passes is formed in a long hole shape so as to allow the horizontal shaft 46 to be displaced in the vertical direction. Here, the vertical axis 45 means an axis extending in a substantially vertical direction, and the horizontal axis 46 means an axis extending in a substantially horizontal direction. In this embodiment, the vertical axis 45 and the horizontal axis 46 are both composed of coupling pins. .

  On the end side located on the lower side of the protective tube 26, the second portions 21b to 24b of the hydraulic hoses 21 to 24 are respectively pulled out to the outside of the protective tube 26, and corresponding hose couplers 50a and 50b (2 in the figure). Are connected to the third portions 21c to 24c of the hydraulic hoses 21 to 24. The third portions 21c to 24c of the hydraulic hoses 21 to 24 are not shown in detail in the drawing, but all of the third portions 21c to 24c temporarily extend from the connection points with the hose couplers 50a and 50b to the upper portions of the inner plates of the crawler frames 7L and 7R. After that, the crawler frames 7L and 7R are arranged along the upper portion of the inner plate to the traveling hydraulic motors on the rear end side.

  A long support plate 51 for protecting and supporting the lower surface of the protective tube 26 is provided in contact with the lower surface of the protective tube 26 at a position located on the lower side of the protective tube 26. As shown in an enlarged detail in FIGS. 23 to 26, the support plate 51 includes a pair of angle members 52 and 52, and three kinds of different sizes for connecting the angle members 52 and 52 at predetermined intervals. The connecting plates 53a, 53b, and 53c, and bar flats 54 and 54 that protrude upward from the two angles 52 and 52 respectively. A small hole 55 is provided at the tip of each bar flat 54, and a pin (not shown) is inserted into the small hole 55 and installed between the pair of bar flats 54, 54. The protective tube 26 is prevented from coming out.

  As shown in FIGS. 14 to 17, one end of the support plate 51 is fixed to the first member 42 of the joint member 4 by screws 41 together with the lower end of the protective tube 26. On the other hand, the other end side of the support plate 51 is provided on the lower plate 3 of the track frame 1 located substantially directly below the swivel joint 25 as shown in FIGS. 2, 3, 8, 9, and 18. The first support portion 61 and the second support portion 62 provided near the inside of the vertical plate 4 on the lower plate 3 of the track frame 1 are supported. Here, the second support portion 62 supports the support plate 51 by contacting the support plate 51 regardless of whether the crawler frames 7L and 7R are in the expanded position or the reduced position, but the first support portion 61 is supported. Is in contact with the support plate 51 and supports the support plate 51 only when the crawler frames 7L and 7R are in the contracted position, and contacts the protective tube 26 when the crawler frames 7L and 7R are in the extended position. 26 is directly supported.

  As shown in FIG. 9, the first support portion 61 includes a support bracket 63 attached to the lower plate 3 of the track frame 1 and two guides that are rotatably supported in parallel with the support bracket 63. The support plates 51 and 51 and the protection tubes 26 and 26 respectively corresponding to the left and right crawler frames 7L and 7R are supported on the guide rollers 64 and 64, respectively. . Further, as shown in FIG. 18, the second support portion 62 includes a support bracket 66 attached to the lower plate 3 of the track frame 1 and a guide roller 67 rotatably supported by the support bracket 66. And has a configuration for supporting the corresponding one support plate 51 and the protective tube 26 on the guide roller 67.

  Next, the operational effects of the above embodiment will be described. Each crawler frame 7L, 7R moves between the expansion position and the contraction position with respect to the track frame 1 by the expansion / contraction operation of the two expansion / contraction hydraulic cylinders 11, 11 respectively. When moving, the protective tube 26 disposed between each of the crawler frames 7L and 7R and the track frame 1 is connected to the upper end, which is a fixed end to the track frame 1, and the end of the crawler frame 7L or 7R. The four hydraulic pressures disposed in the protective tube 26 are merely displaced as the crawler frame 7L or 7R moves while changing the position of the curved portion between the lower end and the lower end. The hoses 21 to 24 do not rub against each other or entangle with other members, and can reliably prevent these interferences.

  In addition, since the lower end of the protective tube 26 is connected to the crawler frame 7L or 7R via the joint member 40 so as to be angularly displaceable, during the expansion / contraction work of the crawler frames 7L, 7R, for example, an attached transformer When jacking up the track frame 1 side with a lifter cylinder (not shown), the track frame 1 and the crawler are caused by a gap δ in the opening 10 of the crawler frames 7L and 7R into which the axle 6 of the track frame 1 is inserted. When a vertical shift occurs between the frames 7L and 7R, or when the crawler frames 7L and 7R are expanded and contracted by the expansion and contraction hydraulic cylinder 11, the crawler frames 7L and 7R have an uneven weight at the front and rear portions thereof. Due to this, even when swaying on a horizontal plane, an excessive bending load does not act on the above-mentioned connection point, Cause the protective tube 26 is not damaged.

  In particular, in the case of the present embodiment, the joint member 40 is a simple member that simply connects the three members 42, 44, 47 to each other by a connecting pin constituting the vertical shaft 45 or the horizontal shaft 46. Can be implemented inexpensively. In addition, since the lower end of the protective tube 26 is connected to the crawler frame 7L or 7R so as to be capable of relative angular displacement around both the vertical axis 45 and the horizontal axis 46, the crawler frames 7L and 7R are expanded or contracted. It is possible to reliably prevent the protective tube 26 from being damaged due to an excessive bending load acting on the above-mentioned connection portion during work.

  Further, through holes 48 through which the vertical shaft 45 penetrates in the third member 47 (specifically, the pair of second coupling portions 47c and 47c) of the joint member 40 are arranged in a line at predetermined intervals along the vehicle width direction. A plurality of the first member 42 and the third member 47 of the joint member 40 are coupled around the vertical shaft 45 so as to be capable of relative angular displacement. Therefore, the length of the joint member 40 in the vehicle width direction can be adjusted as necessary, which can contribute to the ease and efficiency of the assembly work.

  Further, since a through hole 49 through which the horizontal shaft 46 penetrates is formed in the second member 44 of the joint member 40 so as to allow the horizontal shaft 46 to be displaced in the vertical direction, It can be used for height adjustment when the lower end is connected to the crawler frames 7L and 7R through the joint member 40, and when the bending load around the horizontal axis 46 is applied, the horizontal axis 46 is rotated. The horizontal displacement of the horizontal shaft 46 along with the rotational displacement of the horizontal shaft 46 can flexibly cope with the load, and the protection tube 26 can be more reliably prevented from being damaged.

  In addition, this invention is not limited to the said embodiment, A various other form is included. For example, in the above-described embodiment, the protective tubes 26 are arranged so as to extend in the vehicle width direction (left-right direction) from the position just below the swivel joint 25 that is the center of the track frame 1 to the left and right crawler frames 7L, 7R. However, the present invention is not limited to this position. For example, the protective tube 26 extends in the vehicle width direction at a position close to the rear axle 6 of the track frame 1 or a position along the rear side surface of the axle 6. You may comprise.

  In the above embodiment, when the lower end of the protective tube 26 is connected to the crawler claims 7L and 7R via the joint member 40 so as to be angularly displaceable, the joint member 40 is connected to the three members 42, 44, 47 are connected to each other by a vertical shaft 45 or a horizontal shaft 46 in the front-rear direction so that they can be displaced relative to each other. However, the present invention is not limited to the joint member 40 having such a configuration, and for example, a ball joint or a universal joint is used. In some cases, a joint member capable of relative angle only around the vertical axis or around the horizontal axis in the front-rear direction may be used.

  Furthermore, in the above embodiment, when the joint member 40 is configured by connecting the three members 42, 44, 47 to each other by the vertical shaft 45 or the horizontal shaft 46 in the front-rear direction, the joint member 40 is provided with the protective tube 26. The first member 42 and the third member 47 fixed to the lower end are coupled so that they can be displaced relative to each other around the vertical axis 45, and the second member 44 and the second member 44 fixed to the crawler frames 7L and 7R are connected. The third member 47 is coupled to the longitudinal axis 46 in the front-rear direction so as to be capable of relative angular displacement. However, in the present invention, the first member 42 fixed to the lower end of the protective tube 26 and the third member The second member 44 fixed to the crawler frames 7L and 7R and the third member 47 can be displaced relative to each other about the vertical axis. May be configured to bind to It goes without saying.

  In addition, in the above-described embodiment, corresponding to the axle 6 of the track frame 1, the pair of left and right crawler frames 7L and 7R are provided with openings 10 penetrating in the vehicle width direction. The crawler type work machine in which the crawler frames 7L and 7R are movable between the extended position that maximizes the distance between the crawler centers and the minimum position that minimizes the distance between the axles 6 with the structure that penetrates the axle 6 has been described. The invention is not limited to such a structure. For example, the crawler frame is expanded and contracted by the structure using the arm member 107 as shown in FIGS. 27 and 28, or the structure in which the axle of the track frame can be expanded and contracted. Needless to say, the present invention can be similarly applied to a crawler type work machine or the like provided to be movable between positions.

  Furthermore, in the above embodiment, the vertical shaft 45 penetrates through the second coupling portion 47c of the third member 47 of the joint member 40 in order to make it possible to adjust the length of the joint member 40 in the vehicle width direction. A plurality of holes 48 are provided in a row at predetermined intervals along the vehicle width direction. However, the present invention is not limited to this, and for example, the first coupling portion 47a of the third member 47 of the joint member 40 is formed in a rod shape. When the first coupling portion 47a is coupled to the second member 44, a long hole is provided in the second member 44 in the vehicle width direction, and the nut is passed through a bolt at an arbitrary position of the long hole. By using this, the length of the joint member 40 in the vehicle width direction may be provided to be adjustable.

It is a top view which shows the structure of the lower traveling body of the crawler type work machine which concerns on embodiment of this invention. It is sectional drawing in the XX line of FIG. It is sectional drawing in the YY line | wire of FIG. It is an expanded sectional view in the ZZ line of FIG. It is the arrow line view seen from the D direction of FIG. It is an expanded sectional view of the upper part in the EE line of FIG. It is the arrow line view seen along the FF line of FIG. FIG. 4 is an enlarged view around G in FIG. 3. It is sectional drawing in the HH line of FIG. It is the arrow line view seen along the II line of FIG. FIG. 9 is an enlarged view near the lower end of the swivel joint in FIG. 8. FIG. 10 is an enlarged view of the vicinity of the lower end of the swivel joint of FIG. 9. It is the arrow line view seen along the JJ line | wire of FIG. FIG. 4 is an enlarged view around K in FIG. 3. It is an expanded sectional view in the LL line of FIG. It is the arrow view seen from the M direction of FIG. It is sectional drawing in the NN line | wire of FIG. It is an expanded sectional view in the OO line of FIG. It is a side view which shows the whole structure of a protective tube. It is an enlarged side view of a protective tube. It is the enlarged plan view which looked at the protective tube from the curved outer periphery side. It is an expanded sectional view in the PP line of FIG. (A) is a top view of a support plate, (b) is the front view. It is an expanded sectional view in the QQ line of Drawing 23 (b). It is an expanded sectional view in the RR line of Drawing 23 (b). It is an enlarged view of S vicinity of FIG.23 (b). It is a figure equivalent to FIG. 1 which shows a prior art example. It is sectional drawing in the TT line | wire of FIG.

Explanation of symbols

1 Track frame 7L, 7R Crawler frame 9 Crawler 21, 22, 23, 24 Hydraulic hose 26 Protection tube 40 Joint member 42 First member 44 Second member 45 Vertical shaft 46 Horizontal shaft 47 Third member 48, 49 Through Hole

Claims (5)

A pair of left and right crawler frames, each mounted with a crawler on the outer periphery, are provided on both left and right sides of the track frame so as to be movable between an extended position that maximizes the distance between the crawler centers and a reduced position that minimizes the distance between the track frames. In a crawler type work machine in which a plurality of hydraulic hoses are arranged in each crawler frame,
Between the track frame and each of the crawler frames, a protective tube that can be bent on one surface side is arranged in a state extending in the vehicle width direction while bending over two upper and lower stages, and on the upper stage side of the protective tube One end located is fixed to the track frame, and the other end located on the lower side of the protective tube is connected to the crawler frame via a joint member so as to be angularly displaceable. A hydraulic piping structure for a crawler type work machine, wherein the hydraulic piping structure is arranged through the protective pipe.   The joint member includes a first member fixed to the lower end of the protective tube, a second member fixed to the crawler frame, and one end perpendicular to one of the first and second members. And a third member coupled to the other of the first and second members so as to be capable of relative angular displacement about a horizontal axis in the front-rear direction. Item 2. The hydraulic piping structure of the crawler type work machine according to Item 1.   The hydraulic piping structure for a crawler type work machine according to claim 2, wherein the joint member is provided so that a length in a vehicle width direction can be adjusted.   In any one of the third member of the joint member and the first or second member coupled to the third member around the vertical axis, a through hole through which the vertical shaft passes is provided at predetermined intervals along the vehicle width direction. The hydraulic piping structure of the crawler type work machine according to claim 3, wherein a plurality of them are provided in a row.   The through-hole through which the horizontal shaft passes allows the vertical displacement of the horizontal shaft in either the third member of the joint member or the first or second member coupled with the third member around the horizontal shaft. The hydraulic piping structure for a crawler type work machine according to any one of claims 2 to 4, wherein the hydraulic piping structure is formed in a long hole shape.