JP2007210509A - Crawler traveling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crawler traveling device which is superior in riding comfort, and hard to be derailed. <P>SOLUTION: In the crawler traveling device winding and stringing a crawler belt 15 over a driving sprocket 11 at a front end, a tension ring 12 at a rear end, and a plurality of ground rolling wheels 13 arranged between those, a truck frame 23 supporting the ground rolling wheels 13 is divided into a plurality of front and rear truck frame parts 23a, 23b, 23c. The plurality of the front and rear ground rolling wheels 13 are respectively journaled to the truck frame parts 23a, 23b, 23c so as to loosely rotate, and the truck frame parts 23a, 23b, 23c are structured to vertically rock about fulcrums c, d, e at a midpoint in a longitudinal direction thereof. The maximum vertical displacement amount hb, hc of the ground rolling wheels 13 at the truck frame parts 23b, 23c on a rear side is made to be larger than the maximum vertical displacement amount ha of the ground rolling wheel 13 at the truck frame part 23a of the foremost portion. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a crawler traveling device used mainly for various working machines including a combine.

A crawler traveling device of a combine is configured by winding and stretching a crawler belt over a driving sprocket at a front end, a tension wheel at a rear end, and a plurality of grounded wheels disposed therebetween. As disclosed in Document 1, the balance link 12 pivotally connected to the front and rear three locations of the track frame 11 is pivotally mounted with a pair of front and rear grounding wheels 13 or disclosed in Patent Document 2. As described above, there is known one in which three grounding wheels 4 are pivotally mounted on each of the balance arms 41 pivotally connected to two front and rear portions of the track frame 10.
JP 2004-248561 A JP 2001-260957 A

  In the crawler traveling device shown in Patent Document 1 or Patent Document 2, the balance links at the front and rear three locations or the balance arms at the two front and rear locations can swing up and down independently. In this case, it is possible to expect a function of suppressing running vibration and pitching of the aircraft. When the crawler traveling device touches a raised part on the ground, the balance link and the balance arm at the foremost end move up and swing by the ground reaction force, and the impact is reduced, but the balance link and the balance arm are excessive. If the rocker is swung upward, the return rocking of the balance link and the balance arm may be delayed when passing through the raised portion, and the ground contact wheel at the foremost end may be lifted from the crawler belt and easily removed.

  The present invention has been made paying attention to such points, and has as its main object to provide a crawler traveling device that is excellent in riding comfort and difficult to remove.

A first aspect of the present invention is a crawler traveling device in which a crawler belt is wound and stretched across a driving sprocket at a front end, a tension wheel at a rear end, and a plurality of grounded wheels disposed therebetween.
The track frame that supports the grounding wheel is divided into a plurality of front and rear track frame parts, and a plurality of front and rear grounding wheels are pivotally supported on each of the track frame parts, and each track frame part is elongated in the longitudinal direction. It is configured to be able to swing up and down around a fulcrum in the middle of the direction, and the maximum vertical displacement of the grounded wheel in the rear track frame part is larger than the maximum vertical displacement of the grounded wheel in the frontmost track frame part. As described above, the swing range of each track frame portion is set.

  According to the above configuration, the track frame portion divided into a plurality of front and rear parts can independently swing up and down in the form of a balance, so that each grounding wheel moves up and down in accordance with the unevenness of the ground, so that traveling vibration and airframe Suppresses pitching.

  When the crawler traveling device reaches a raised portion on the ground, the track frame portion at the foremost end swings forward and swings due to the ground reaction force, and the ride-up impact is alleviated. In this case, since the swing range of the front track frame portion is limited to a small size, the return swing of the front track frame portion is not delayed when passing through the raised portion, and the ground contact wheel at the foremost end floats from the crawler belt. This phenomenon is suppressed.

  Therefore, according to 1st invention, while being excellent in riding comfort, the crawler traveling apparatus which is hard to take off at the time of the passage of a protruding part can be comprised.

According to a second invention, in the first invention,
The track frame is divided into three parts, a front track frame part, an intermediate track frame part, and a rear track frame part, and the ground track rotation in the intermediate track frame part is larger than the maximum vertical displacement of the ground wheel in the front track frame part. The maximum vertical displacement amount of the wheel is increased.

  According to the above configuration, since the ground contact portion of the crawler traveling device can be deformed up and down in the three regions in the longitudinal direction, each grounding wheel moves up and down suitably corresponding to the unevenness of the ground, so that traveling vibration and airframe Suppresses pitching.

  A large amount of upward deformation of the crawler belt in the middle of the crawler traveling device at the front and rear can be ensured, and when traveling over a ridge or passing through a corner between a slope and a flat surface, the traveling machine body The function of suppressing large pitching fluctuation is high.

According to a third invention, in the first or second invention,
The track frame is divided into a front track frame portion, an intermediate track frame portion, and a rear track frame portion, and the ground rolling rotation in the rear track frame portion is larger than the maximum vertical displacement of the ground rolling wheel in the front track frame portion. The maximum vertical displacement amount of the wheel is increased.

  According to the above configuration, it is possible to ensure a large amount of upward deformation of the crawler belt in the middle of the front and rear in the ground contact portion of the crawler traveling device, so as to get over the ridge and pass through the corner between the slope and the flat portion. In this case, the function of suppressing the large pitching fluctuation of the traveling machine body is high.

According to a fourth invention, in the second or third invention,
The maximum vertical displacement amount of the grounding wheel in the intermediate track frame portion is configured to be larger than the maximum vertical displacement amount of the grounding wheel in the rear track frame portion.

  According to the above configuration, it is possible to secure a sufficient amount of bending deformation of the crawler belt in the middle of the crawler traveling device at the front and rear, so as to pass over the ridge and pass through the corners of the slope and the flat part. In this case, the function of suppressing the large pitching oscillation of the traveling machine body is further enhanced.

A fifth invention is the invention according to any one of the first to fourth inventions,
An elevating track frame that can be driven up and down with respect to the body frame is provided, and the track frame portion divided into a plurality of front and rear is supported on the elevating track frame so as to be swingable up and down.

  According to the above configuration, the aircraft height relative to the crawler grounding part can be changed by moving the lifting track frame up and down, and the left and right inclined posture of the aircraft can be changed by independently changing the aircraft height in the left and right crawler traveling devices Even in a field where the aircraft tilts to the left and right due to undulations and hardness of the ground, it is possible to correct this and perform work traveling in an appropriate posture.

  FIG. 1 shows a side surface of a self-removing combine as an example of a farm work machine provided with a crawler traveling device 1 according to the present invention. In this combine, a cutting unit 3 is connected to a front part of a traveling machine body 2 having left and right crawler traveling devices 1 so as to be movable up and down, and a driving unit 4, a threshing device 5, and a grain unloading device are connected to the traveling machine body 2. The attached grain collection tank 6 is mounted.

  As shown in FIGS. 2 and 3, the crawler traveling device 1 includes a driving sprocket 11 at the front end, a tension wheel 12 at the rear end, and a plurality (eight in this example) of grounded rolling wheels 13 disposed therebetween. Further, the crawler belt 15 made of rubber is wound around the pair of front and rear carrier rollers 14. A pair of left and right cored bar protrusions 16 are projected on the inner peripheral surface of the crawler belt 15 at a constant pitch, and the grounding wheel 13 is configured as an outer ring type straddling the cored bar protrusion 16 from the left and right. The tension ring 12 and the carrier roller 14 are configured as an inner ring type that is engaged between the left and right cored bar protrusions 16.

  A fixed track frame 18 is provided via a pair of front and rear legs 17 on the lower left and right sides of the body frame 7 provided at the lower part of the traveling body 2, and the carrier roller 14 is freely rotatable on the fixed track frame 18. It is attached to. A pair of front and rear swing arms 19 and 20 are pivotally connected to the front and rear of the fixed swing frame 18 so as to swing up and down around the fulcrums a and b. The front part of the track frame 21 is pivotally supported and supported, and the rear part of the lifting track frame 21 is pivotally connected to the free end of the rear swing arm 20 via an auxiliary link 22.

  The tension wheel 12 and the grounding wheel 13 group are supported on the outer side of the elevating track frame 21 via a track frame 23. The track frame 23 is divided into a front track frame portion 23a, an intermediate track frame portion 23b, and a rear track frame portion 23c. The front track frame portion 23a and the intermediate track frame portion 23b that are short in the front and rear are respectively provided with two front and rear grounding wheels 13, and the rear track frame portion 23c that is long in the front and rear is provided with four grounding wheels 13. And the tension wheel 12, and the center-to-axis distance Lc between the front and rear end grounding wheels 13 in the rear track frame portion 23c is equal to the front and rear end grounding wheels 13 in the front track frame portion 23a and the intermediate track frame portion 23b. The center-to-axis distances La and Lb of the front track frame portion 23a are substantially equal to the center-to-axis distance La of the front track frame portion 23a and the center-to-axis distance Lb of the intermediate track frame portion 23b.

  The front track frame portion 23a and the intermediate track frame portion 23b are configured to have the same specifications. A pair of front and rear grounding wheels 13 are supported in a freely swingable manner at positions equidistant from the fulcrums c and d. A derailment prevention guide 24 that enters between the left and right cored bar projections 16 is integrally formed at the lower part of the front track frame portion 23 a and the intermediate track frame portion 23 b, and the crawler belt 15 is connected to the grounding wheel 13. Therefore, it is possible to prevent the lateral displacement and disengagement.

  The front and rear intermediate portions of the rear track frame portion 23c are pivotally connected in a swingable manner in the form of a balance about a fulcrum e shared with the pivot point of the auxiliary link 22 with respect to the lifting track frame 21. Two grounding rollers 13 are pivotally supported on the front side and the rear side, respectively, so as to be freely rotatable. A slide bracket 26 is mounted on the rear upper side of the rear track frame portion 23c via a jack bolt 25 so as to be adjustable in the front-rear direction. The tension wheel 12 is pivotally mounted on the slide bracket 26 so as to be freely rotatable. A pair of front and rear derailment prevention guides 27 that are inserted between the left and right core metal protrusions 16 are also attached and fixed in a row in the lower portion of the rear track frame portion 23c.

  A check link 28 is installed between the front and rear intermediate portions of the lift track frame 21 and the front portion of the rear track frame portion 23c. The check link 28 is connected to the front side surface of the rear track frame portion 23c via a pivot shaft 29 so as to be rotatable up and down, and the elevating track frame 21 is inserted into a front and rear elongated hole 30 formed in the check link 28. The support shaft 31 protruding from the side surface of the support shaft 31 is inserted, and the check link 28 is sandwiched between the collar 32 fitted to the support shaft 31 and the washer 33 attached to the end of the shaft, so that the rear track frame portion 23c moves around the fulcrum e. It is prevented from swinging left and right around the center.

  A pair of stopper bolts 35 that are close to and opposed to the upper surface of the front track frame portion 23a before and after the fulcrum c are provided at the front portion of the elevating track frame 21, and the front track frame is brought into contact with the stopper bolt 35. The vertical swing range of the portion 23a is limited to be small. The intermediate track frame portion 23b is limited in its vertical swing range by the interference between the grounding roller 13 and the front carrier roller 14 and the grounding wheel 13 and the check link 28, and the rear track frame portion 23c The up and down swing range is limited by the contact between the both ends of the long hole 30 of the check link and the support shaft. As a result, the maximum vertical displacement amount ha of the grounding wheel 13 provided in the front track frame portion 23a is the smallest, and the maximum vertical displacement amount hc of the grounding wheel 13 at the front end provided in the rear track frame portion 23c is the smallest. Next, the largest vertical displacement amount hb of the grounding wheel 13 provided in the intermediate track frame portion 23b is the largest (ha <hc <hb). Note that the longitudinal position of the body center of gravity G is set to a position behind the intermediate track frame portion 23b or near the middle between the intermediate track frame portion 23b and the rear track frame portion 23c.

  Operation arms 19b and 20b extend from the inward end portions of the support shafts 19a and 20a connected to the base ends of the front and rear swing arms 19 and 20, respectively, so as to be able to swing together. 20 b is interlocked and connected by a linkage rod 36, and a hydraulic cylinder 37 is installed over the rear operation arm 20 b and the body frame 7.

  According to the above-described configuration, when the hydraulic cylinder 37 is extended, the front and rear swing arms 19 and 20 are swung downward synchronously, and the lifting track frame 21 is moved downward substantially in parallel, so that the airframe frame relatively moves. The ground clearance of 7 increases. On the contrary, when the hydraulic cylinder 37 is shortened, the front and rear swing arms 19 and 20 are swung upward synchronously, and the lifting track frame 21 is moved upward substantially in parallel. Ground clearance is reduced. Therefore, the hydraulic cylinders 37 in the left and right crawler travel devices 1 are independently controlled to change the ground height on the left and right of the body frame 7 to change and adjust the left and right inclined posture of the travel body 2. It is.

  The front, middle, and rear track frame portions 23a, 23b, and 23c with respect to the lift track frame 21 are independently swingable up and down around the fulcrums c, d, and e. When traveling on the ground, each of the track frame portions 23a, 23b, and 23c independently swings so that the vehicle can travel smoothly and comfortably without causing a large vertical movement of the airframe. In addition, the intermediate track frame portion 23b swings up and back, and the rear track frame portion 23c swings up and down, so that the front and rear centers of the crawler grounding portions are greatly recessed upward, and the traveling body 2 is moved up and down. It is possible to smoothly get over bumps on the ground, ridges, corners between slopes and flat surfaces, etc., without greatly pitching and swinging.

  When the crawler traveling device 1 approaches the raised portion, the front track frame portion 23a swings up and swings due to the ground reaction force, and the impact is reduced. However, the swing range of the front track frame portion 23a is small. Because of the restriction, the foremost ground contact wheel 13 does not move excessively upward, and the front track frame portion 23a quickly returns and swings when passing through the raised portion. It is avoided that it becomes easy to lift off from the wheel.

  [Other Examples]

  (1) In the above-described embodiment, the case where the track frame 23 supporting the grounding wheel 13 group and the tension wheel 12 is divided into three parts in the front and rear is illustrated. It can also be implemented in a form that is supported so as to be swingable up and down.

  (2) The maximum vertical displacement amount hc of the ground contact wheel 13 at the foremost end in the rear track frame portion 23c is equal to or more than the maximum vertical displacement amount hb of the ground contact wheel 13 at the rear side in the intermediate track frame portion 23b. It can also be set to increase.

  (3) In the above-described embodiment, the front and rear swing arms 19 and 20 are swing-driven synchronously by the single hydraulic cylinder 37, so that the lifting track frame 21 supported by these swing arms 19 and 20 is moved. Although the case where it moves up and down substantially in parallel is illustrated, the front and rear swing arms 19 and 20 can be configured to be swingable by separate hydraulic cylinders. According to this, the elevating track frame 21 can be raised and lowered substantially in parallel by swinging the front and rear swing arms 19 and 20 in the same direction by the same amount, and the lift and lower swing frames 19 and 20 can be lifted by making the swing amounts of the swing arms 19 and 20 different. It is also possible to change the front / rear tilt posture of the track frame 21 and to correct the front / rear posture of the traveling machine body 2.

Combine side view Side view of crawler traveling device Top view of crawler traveling device Side view showing the front half of the grounded wheel support structure Side view showing the latter half of the grounded wheel support structure Cross-sectional plan view showing the anti-swaying imagination of the rear track frame part Longitudinal rear view of crawler traveling device Side view showing the displacement operation of the ground wheel

Explanation of symbols

11 Drive sprocket 12 Tension wheel 13 Ground wheel 15 Crawler belt 19 Swing arm 20 Swing arm 21 Lifting track frame 23 Track frame 23a Front track frame portion 23b Intermediate track frame portion 23c Rear track frame portion ha Maximum of ground wheel Vertical displacement amount hb Maximum vertical displacement amount of grounded wheel hc Maximum vertical displacement amount of grounded wheel

Claims (5)

In a crawler traveling device in which a crawler belt is wound and stretched over a driving sprocket at the front end, a tension wheel at the rear end, and a plurality of grounding wheels arranged between them,
The track frame that supports the grounding wheel is divided into a plurality of front and rear track frame parts, and a plurality of front and rear grounding wheels are pivotally supported on each of the track frame parts, and each track frame part is elongated in the longitudinal direction. It is configured to be able to swing up and down around a fulcrum in the middle of the direction, and the maximum vertical displacement of the grounded wheel in the rear track frame part is larger than the maximum vertical displacement of the grounded wheel in the frontmost track frame part. A crawler traveling device in which the swing range of each track frame portion is set as described above.   The track frame is divided into three parts, a front track frame part, an intermediate track frame part, and a rear track frame part, and the ground track rotation in the intermediate track frame part is larger than the maximum vertical displacement of the ground wheel in the front track frame part. The crawler traveling device according to claim 1, wherein the maximum vertical displacement amount of the wheel is increased.   The track frame is divided into a front track frame portion, an intermediate track frame portion, and a rear track frame portion, and the ground rolling rotation in the rear track frame portion is larger than the maximum vertical displacement of the ground rolling wheel in the front track frame portion. The crawler traveling device according to claim 1, wherein the maximum vertical displacement amount of the wheel is increased.   The crawler traveling device according to claim 2 or 3, wherein a maximum vertical displacement amount of the grounding wheel in the intermediate track frame portion is larger than a maximum vertical displacement amount of the grounding wheel in the rear track frame portion.   5. An elevating track frame that can be driven up and down with respect to the body frame is provided, and the track frame portion divided into a plurality of front and rear is supported on the elevating track frame so as to be swingable up and down. The crawler traveling device according to item.

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