JP2009023489A - Crawler type traveling device and vehicle having pair of right and left crawler type traveling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply move a track frame relative to a rear axle case in the right and left direction without requiring a large force in response to a position change in the right and left direction of an outer peripheral part side of a drive wheel. <P>SOLUTION: In a crawler type traveling device, the track frame is rockably supported on the rear axle case through a rocking shaft in the right and left direction, a crawler is wound around drive wheels, front and rear driven wheels and idler wheels, the outer peripheral part sides of the drive wheel is positionally changed in the right and left direction so that the crawler is changed and adjusted in the right and left direction, and the track frame is movably supported on the rear axle case side in the right and left direction. The crawler type traveling device is provided with a drive means which move the track frame in the right and left direction relative to the rear axle case so that the front and rear driven wheels and the idler wheels are positionally changed in the right and left direction in response to the position change in the right and left direction of the outer peripheral part side of the drive wheel. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a crawler type traveling device that can be mounted on the rear portion of a tractor and a vehicle such as a tractor having a pair of left and right crawler type traveling devices.

For example, as a crawler type traveling device, there is one that constitutes a semi-crawler tractor by installing as a rear tire wheel of a tractor or instead of a rear tire wheel.
In this type of crawler type traveling device, a drive wheel is attached to the rear axle of the traveling vehicle body, and the track frame swings around the swinging shaft via the left and right swinging shaft to the rear axle case that supports the rear axle. Front and rear driven wheels are disposed at the front and rear ends of the track frame and idler wheels are provided in the middle, and a crawler is wound around the drive wheels, the front and rear driven wheels and the idler wheels for driving. Some of the crawlers that wrap around the drive wheels circulate and rotate in the circumferential direction by rotating the wheels, and when using a tractor equipped with this crawler type traveling device in the field, Since the widths are different, it is necessary to change the tread corresponding to the width of the gap between the ridge grooves (grooves between the ridges).

Therefore, in this type of conventional crawler type traveling device, the tread can be changed with a simple structure, and the driving wheel (the outer periphery of the driving wheel on which the crawler is wound) is mounted on the rear axle side with the driving wheel mounted on the rear axle side. The outer peripheral side of the drive wheel is positioned in the left-right direction so that the crawler can be adjusted in the left-right direction by offsetting the drive wheel in the left-right direction and flipping the drive wheel left and right and attaching it to the rear axle side mounting part It is configured to be changeable, and the track frame is supported so as to be movable in the left-right direction together with the swing shaft, and the position of the swing shaft is changed in the left-right direction, thereby changing the position in the left-right direction on the outer peripheral side of the drive wheel. Correspondingly, there is one in which front and rear driven wheels and idler wheels can be repositioned in the left-right direction (for example, Patent Document 1).
JP 2003-276657 A JP 2003-095154 A

However, conventionally, the track frame or the swing shaft is manually moved and changed in the left and right direction, so that the front and rear driven wheels and the idler wheel correspond to the change in the left and right position on the outer peripheral side of the drive wheel. It is troublesome to move the track frame in the left-right direction so that the position of the track frame can be changed in the left-right direction, and considerable force is required to move the track frame in the left-right direction with respect to the rear axle case. In addition, the entire change operation of the tread width of the crawler type traveling device is troublesome.
In view of the above problems, the present invention easily moves the track frame with respect to the rear axle case in the left-right direction without requiring a large force in response to the change in the position in the left-right direction on the outer peripheral side of the drive wheel. It is something that can be done.

The technical means of the present invention for solving this technical problem is that a driving wheel is attached to the rear axle of the traveling vehicle body, and the truck frame is oscillated on the rear axle case supporting the rear axle via the left and right oscillating shaft. The front and rear driven wheels are supported at the front and rear ends of the track frame, and idler wheels are provided in the middle, and crawlers are provided on the drive wheels, the front and rear driven wheels, and the idler wheels. The outer periphery of the drive wheels can be repositioned in the left-right direction so that the crawler can be adjusted in the left-right direction when it is wound around, and the track frame is supported so as to be movable in the left-right direction with respect to the rear axle case side. In the crawler type traveling device,
The track frame is moved in the left-right direction with respect to the rear axle case so that the front-rear driven wheel and the idler wheel can be changed in the left-right direction in response to the position change in the left-right direction on the outer peripheral side of the drive wheel. The driving means is provided.

Further, according to another technical means of the present invention, a left and right support cylinder is fixed to the rear axle case, and the swinging shaft is rotatable about the axis and movable in the left and right directions on the support cylinder. The track frame is coupled to the swing shaft, and the drive means is configured to move the swing shaft together with the track frame in the left-right direction.
According to another technical means of the present invention, the swing shaft is formed longer in the left-right direction than the support cylinder, and a pair of support plates are fixedly provided at both ends of the swing shaft. A pair of support plates is selectively interposed between one support plate and the support tube body or between the other support plate and the support tube body so as to restrict lateral movement relative to the support tube body. The spacer member is provided.

Another technical means of the present invention is that a hydraulic cylinder is provided as the driving means, and one end side of the hydraulic cylinder is connected to the swing shaft so as to move the swing shaft to the left and right by the expansion and contraction of the hydraulic cylinder. It is in.
Another technical means of the present invention is that the driving wheel is supported on the rear axle of the traveling machine body so that the driving wheel can move left and right and cannot rotate relative to each other, and the driving wheel moves left and right in conjunction with the left and right movement of the swing shaft. Thus, the drive shaft is connected to the swing shaft.
According to another technical means of the present invention, a pair of left and right crawler type traveling devices are provided on the left outer end side of the axle case, and driving wheels, crawlers, and track frames of the pair of left and right crawler type traveling devices are respectively provided. In a vehicle having a pair of left and right crawler type traveling devices that are provided corresponding to the left and right, and provided with a swing shaft in the left and right direction corresponding to the left and right,
A hydraulic cylinder is supported as a drive means between the pair of left and right swing shafts so as to be movable left and right, and the pair of left and right track frames are moved toward and away from each other by the expansion and contraction of the hydraulic cylinder. One end side is connected to one swing shaft, and the other end side of the hydraulic cylinder is connected to the other swing shaft.

  According to the present invention, the track frame is driven by the driving means such as a hydraulic cylinder so that the front and rear driven wheels and the idler wheel are repositioned in the left-right direction in response to the position change in the left-right direction on the outer peripheral side of the drive wheel. Can be easily moved without requiring a large force in the left-right direction, and the tread width changing operation of the crawler type traveling device becomes easy.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, 101 is a semi-crawler tractor (vehicle) in which a crawler type traveling device 1 (semi-crawler 7) is provided independently on the left and right instead of the rear wheel of a four-wheel drive tractor, and a front wheel 107 is a steered wheel. ing.
This tractor 101 is exemplified by a tractor with a cabin in which a cabin 104 is mounted on the rear portion of a vehicle body (traveling vehicle body) 30, and a driver seat 105 is provided in the rear portion of the cabin 104, in front of the driver seat 105. The steering handle 106 is provided.

The traveling machine body 30 is configured by attaching a power transmission case 109 to a rear portion of the engine 108 via a flywheel housing, and the power transmission case 109 includes a clutch housing and a transmission case.
The front wheels 107 are provided on the left and right sides of the front axle case supported by the front axle frame 110, and the front axle case is attached to the front axle frame 110 attached and fixed to the engine 108 so as to protrude forward from the engine 108. It is supported so as to be swingable around the longitudinal axis.
As shown in FIG. 3, the crawler type traveling device 1 has a left and right outer end side of a rear axle case 34 (axle case) provided on the rear end side of a power transmission case (mission case) 31 so as to protrude in the left and right direction. Is attached to. A pair of left and right crawler type traveling devices 1 are provided on the outer end side in the left and right direction of the rear axle case 34. Drive wheels 6, crawlers 7, and track frames 2 of the pair of left and right crawler type traveling devices 1 are provided corresponding to the left and right, respectively, and left and right swing shafts 8 are provided corresponding to the left and right.

2 and 3, the crawler type traveling device 1 includes a track frame 2 formed of a square member, a plate member, a pipe member, etc., a tension adjusting front driven wheel (adjusting wheel) 3, and an idle driven post wheel 4. The intermediate idler wheels 5 are arranged and supported in the front-rear direction, the drive wheels 6 are arranged above the idler wheels 5, the crawlers 7 are wound around these wheels, and the track frame 2 is attached to the drive wheels 6 It is configured to be swingable around a swing shaft 8 that is parallel to and below the shaft core.
The drive wheels 6, the crawler 7, and the track frame 2 of the pair of left and right crawler type traveling devices 1 are provided corresponding to the left and right, respectively. Further, left and right swing shafts 8 of the pair of left and right crawler type traveling devices 1 are also provided corresponding to the left and right.

The front driven wheel 3 is rotatably supported by a free end of a downwardly inclined tension adjusting mechanism 9 provided on the upper surface of the front end of the track frame 2 via a support shaft 3A.
As shown in FIG. 4, the tension adjusting mechanism 9 is supported by a support 11 fixed to an inclined base 2 a that is inclined forward and downward on the upper surface of the track frame 2, and is supported by the support 11 so as to be slidable in the longitudinal direction. A shaft support 10 that supports the support shaft 3A of the front driven wheel 3, a tension spring 12 that repels the shaft support 10 toward the front driven wheel 3, and the shaft support 10 when the crawler 7 is extended. It has slack correction means 13 that moves to the moving wheel 3 side and absorbs elongation. A cover 17 that covers the tension adjusting mechanism 9 is provided above the inclined base 2a. The cover 17 is supported on the support body 11 via an attachment member 19.

The rear end of the track frame 2 has a bifurcated shape, and rotatably supports the support shaft 4A of the rear driven wheel 4 via a pair of left and right bearing bodies 18.
The idler wheel 5 has a smaller diameter than the front driven wheel 3 and the rear driven wheel 4, and is arranged on the track frame 2 through the wheel shaft 5A in the front and rear, and exemplifies a freely rotatable Matagi wheel. .
In the idler wheel 5 on the front side of the idler wheel 5, the wheel shaft 5 </ b> A is supported by the track frame 2 via a bracket 24 fixed to the lower surface, and the rearward side of the idler wheel 5. In the idler wheel 5 of the two wheels (middle part and rear part), the wheel shaft 5A is pivotally supported by the equalizer link 20, and the front and rear halfway portions of the equalizer link 20 are pivotally supported by a support bracket 21 fixed to the track frame 2. It is pivotally supported so that the seesaw can swing freely.

  As shown in FIGS. 2, 3, and 5, the support bracket 21 is formed in a U shape with an open lower end, and the upper end portion of the support bracket 21 is fixed to the track frame 2 by welding or the like, and a pivot shaft 22. By fixing the fixing plate 25 fixed to the support bracket 21 with bolts, the pivot shaft 22 is fixed to the support bracket 21, and the support cylinder 26 is fixed to the pivot shaft 22 in the horizontal direction with respect to the pivot shaft 22. The front and rear halfway part of the equalizer link 20 is externally fitted and fixed to the support cylinder 26 so that the front and rear halfway part of the equalizer link 20 is fixed to the track frame 2. The bracket 21 is pivotally supported via a pivot shaft 22 so that the seesaw can swing.

  A mountain-shaped cover body 27 is provided at the rear part of the track frame 2 so as to cover the upper surface of the track frame 2, and a scraper 28 projects from the cover body 27 toward the rear driven wheel 4. Mud or the like adhering to the driven wheel 4 is scraped off during traveling. Scrapers 29 directed toward the idler wheel 5 are provided at both front and rear ends of the equalizer link 20, and the scraper 29 scrapes off mud and the like adhering to the idler wheel 5 of the rear two wheels during traveling. A scraper 30 facing the idler wheel 5 is provided behind the front idler wheel 5 of the bracket 21, and mud or the like adhering to the front idler wheel 5 is scraped off during traveling by the scraper 30.

The drive wheel 6 is composed of a sprocket (a drive transmission body having teeth on the outer periphery of a disc) mounted on the outer end surface of a rear axle (drive shaft) 33. The rear axle 33 is supported by a rear axle case 34 projecting left and right from the rear part of the transmission case 31 constituting the traveling vehicle body 30, and projects outward from the rear axle case 34. In the case of a wheel-type tractor, the rear axle 33 is driven. Tire wheels are mounted instead of the wheels 6.
The pitch circle diameter of the drive wheel 6 is set to be approximately half of the outer circumference circle diameter of the tire wheel. For this reason, the power transmission system to the front wheels has a deceleration for making it approximately equal to the peripheral speed of the drive wheel 6. The device is incorporated. A transmission that increases the peripheral speed of the front wheels more than the peripheral speed of the drive wheels 6 may be provided.

As shown in FIGS. 2, 3, 8, and 9, the drive wheel 6 includes an inner ring body 44 that is detachably attached to a mounting portion 42 on the rear axle 33 side, and an outer ring that is detachably attached to the inner ring body 44. The body 45 and the outer periphery engagement ring | wheel 43 attached to the outer peripheral part of the outer ring body 45 are provided.
The inner ring body 44 integrally includes an inner peripheral side mounting base 46 and an outer peripheral side outer ring mounting part 47 that are displaced in the left-right direction, and the inner ring body 44 has a mounting base 46 and an outer ring mounting part 47 that are respectively left and right. A cylindrical connecting portion in the left-right direction that is formed in a disc ring shape orthogonal to the direction and connects the outer peripheral end side of the mounting base portion 46 of the inner ring body 44 and the inner peripheral end side of the outer ring mounting portion 47 of the inner ring body 44. 48 is provided on the inner ring body 44.

The outer ring body 45 integrally includes an inner peripheral mounting base 51 and an outer peripheral outer peripheral wall 52 that are displaced in the left-right direction. The mounting base portion 51 and the outer peripheral wall portion 52 of the outer ring body 45 are each formed in a disc ring shape orthogonal to the left-right direction, and the outer peripheral end side of the mounting base portion 51 of the outer ring body 45 and the outer peripheral wall portion of the outer ring body 45. A cylindrical connecting portion 53 in the left-right direction that connects the inner peripheral end side of 52 is provided in the outer ring body 45.
The mounting base portion 46 of the inner ring body 44 is attached to and detached from the mounting portion 42 on the front axle 33 side by flipping the inner ring body 44 left and right so that the position of the outer ring mounting portion 47 is changed in the horizontal direction by a fixture 55 such as a bolt and nut. It can be fixed freely. Further, the mounting base portion 46 of the outer ring body 45 can be detachably fixed to the outer ring mounting portion 47 of the inner ring body 44 by flipping the outer ring body 45 left and right with respect to the inner ring body 44 by a fixture 56 such as a bolt and nut. Has been.

The cylindrical connecting portion 53 of the outer ring body 45 is formed to be longer in the left-right direction than the cylindrical connecting portion 48 of the inner ring body 44, and the outer peripheral wall portion 52 of the outer ring body 45 is left and right of the mounting portion 42 on the rear axle 33 side. The lateral displacement difference between the mounting base portion 51 of the outer ring body 45 and the outer peripheral wall portion 52 between the mounting base portion 46 of the inner ring body 44 and the outer ring mounting portion 47 so as to change the position in the left-right direction on the inner side in the direction. It is set larger than the displacement difference in the left-right direction.
The outer peripheral engagement ring 43 is formed in a disk link shape with a large number of engagement teeth 59 protruding on the outer periphery, and the inner periphery thereof is attached to and detached from the outer peripheral wall portion 52 of the outer ring body 45 by a fixture 60 such as a bolt nut. The engagement teeth 59 of the outer peripheral engagement wheel 43 are configured to be freely engageable and disengageable with the engaging portion at the center portion in the width direction (left-right direction) of the crawler 7.

  The outer peripheral engagement wheel 43 is divided into three in the circumferential direction, and three engagement wheel constituent bodies 43a are detachably connected by fasteners 61 such as bolts and nuts, and the crawler 7 wound around the drive wheel 6 is removed. First, the lower engaging wheel constituting body 43a around which the crawler 7 is not wound is removed, and then the driving wheel 6 is moved so that one of the remaining two engaging wheel constituting bodies 43a is detached from the crawler 7. The crawler 7 is rotated by rotating the drive wheel 6 so that the engagement wheel constituting body 43a detached from the crawler 7 is removed and then the remaining one engagement wheel constituting body 43a is removed from the crawler 7. It can be easily removed.

Since the driving wheel 6 is disposed above the idler wheel 5, the front driven wheel 3 and the rear driven wheel 4 are triangularly arranged, and the driving wheel 6 forms an upper apex of the triangle, and the front driven wheel 3 and The rear driven wheels 4 each form a lower vertex. The crawlers 7 (elastic crawler belts) 7 wound around these wheels have a substantially triangular shape (a rice ball shape) in a side view, and the idler wheel 5 is positioned at the bottom of the substantially triangular shape.
The crawler 7 may be an iron crawler, but here, a rubber crawler in which a circumferential tensile body is embedded is used, and the engagement tooth 59 of the drive wheel 6 engages in the center in the width direction. Locking portions such as holes are formed at equal intervals in the circumferential direction, a lug having a pattern such as a horizontal letter or a cross-section is formed on the outer peripheral grounding surface, and a slip-off preventing projection is formed on the inner peripheral surface. The crawler 7 may be formed by embedding a core metal, which is a tensile body in the width direction, at equal intervals in the circumferential direction.

As shown in FIGS. 2, 3, and 6, the track frame 2 is provided with an extending base 66 projecting toward the traveling machine body 30, and the swing support 64 is a bolt nut on the extending base 66. It is detachably fixed by a fastener 67 such as. A mounting frame 68 is bolted to the left and right rear axle cases 34, and a support cylinder 72 is fixed to the lower part of the mounting frame 68. Accordingly, the left and right support cylinders 72 are fixed to the rear axle case 34 via the swing support 64. A cabin support base 70 is provided on the upper stopper plate 68 a of the mounting frame 68.
The swing support body 64 includes a pair of front and rear support members 65 bent in an L shape and a pair of triangular support plates 71 that connect the pair of support members 65, and each pair of support members 65 includes a lower plate. The portion 65 a and the upright plate portion 65 b are fixed by welding or the like, and a support cylinder 72 is disposed between the pair of left and right support plates 71.

  The left-right swing shaft 8 is inserted through the pair of support plates 71 and is inserted and held in the support cylinder 72 so as to be swingable around the left-right axis and movable in the left-right direction. The pair of support plates 71 are fitted and fixed to both ends of the swing shaft 8, and a fixed plate 73 is fixed to the outer end of the swing shaft 8. The fixed plate 73 is fixed with bolts or the like. By fixing to the support plate 71 with the tool 74, the swing support 64 is fixed to the swing shaft 8 via the fixed plate 73 and the support plate 71. As a result, the swing shaft 8 is supported by the mounting frame body 68, the upper portion of the swing support body 64 is supported by the swing shaft 8, and the swing support body 64 attaches the mounting frame body 68 to the rear axle case 34. And the swing shaft 8 are supported so as to be swingable about the center of the swing shaft 8 and movable in the left-right direction. Further, the track frame 2 is connected to the swing shaft 8 via a swing support 64 and an extending base 66, and the track frame 2 is connected to the rear axle case 34 side together with the swing shaft 8. It is supported so as to be swingable around the axis and movable in the left-right direction.

The swing shaft 8 is formed to be longer in the left-right direction than the support cylinder 72, and is between one support plate 71 and the support cylinder 72 of the pair of support plates 71 or the other support plate 71 and the support cylinder 72. A spacer member 77 that is selectively interposed is provided between the two.
Therefore, by removing the spacer member 77 from between the support plate 71 and the support cylinder 72, the swing shaft 8 is within a range in which the pair of support plates 71 are in contact with the outer ends of the corresponding support cylinders 72. Is movable in the left-right direction with respect to the support cylinder 72, and as shown by a solid line in FIG. 6, the swing shaft 8 is moved in the left-right direction with respect to the support cylinder 72 in the left-right direction. By interposing a spacer member 77 between the support plate 71 and the support cylinder 72 on the outer side, the swing shaft 8 moves in the laterally outward direction with respect to the support cylinder 72. The horizontal movement of the shaft 8 is restricted, and as shown by the chain line in FIG. 6, the support plate on the inner side in the left-right direction in a state where the swing shaft 8 is moved inward in the left-right direction with respect to the support cylinder 72. By interposing a spacer member 77 between 71 and the support cylinder 72, the swing shaft 8 is supported by the support cylinder. While moving in the lateral direction inner side with respect to 2, lateral movement of the pivot shaft 8 is adapted to be regulated.

As shown in FIG. 7, the spacer member 77 includes a pair of half-cylinder-shaped holding bodies 79, and a pair of fastening pieces 80 project from both ends of each holding body 79. 79, the swinging shaft 8 is held in an outer fitting shape, the fastening pieces 80 of the respective holding bodies 79 are overlapped with each other, and tightened with a fastener 81 such as a bolt and nut, whereby the spacer member 77 is moved to the swinging shaft 8. It is configured so as to be detachably attached to.
Driving means for moving the track frame 2 in the left-right direction with respect to the rear axle case 34 is provided at an intermediate position between the pair of left and right crawler type traveling devices 1. This driving means is constituted by a hydraulic cylinder 82 in the present embodiment. The hydraulic cylinder (driving means) 82 is disposed in the left-right direction between the pair of swing shafts 8 in the pair of crawler type traveling devices 1, and is supported by a support cylinder 83 protruding from the rear axle case 34 and the like via a bush. It is supported so that it can move left and right.

  As shown in FIG. 6, one end side (rod 82b) of the hydraulic cylinder 82 is connected and fixed to the swing shaft 8 of the left crawler type traveling device 1 by welding or the like, for example, and the other end side of the hydraulic cylinder 82 (cylinder body). 82a (bottom side) is connected and fixed to the swing shaft 8 of the crawler type traveling device 1 on the right side by welding via a connecting rod 85, and the pair of swing shafts 8 are connected to each other by expansion and contraction of the hydraulic cylinder 82. Correspondingly, the pair of left and right track frames 2 are configured to move toward and away from each other in the left-right direction by moving inward in the left-right direction or outward in the left-right direction. Thus, by removing the spacer member 77 and driving the hydraulic cylinder (driving means) 82, the front and rear driven wheels 3 and 4 and the idler wheel 3 and the idle wheel corresponding to the position change in the left-right direction on the outer peripheral side of the driving wheel 6 are achieved. The swing shaft 8 can be moved in the left-right direction together with the track frame 2 so that the position of the wheel 5 can be changed in the left-right direction.

  According to the above embodiment, when changing the tread of the crawler type traveling device 1 from the state of FIG. 8, as shown in FIG. 9, the inner ring body 44 is reversed left and right to attach the mounting base 46 of the inner ring body 44 to the front axle 33. The outer ring body 45 is then detachably fixed to the mounting portion 42 on the side, and the outer ring 45 is then oriented so that the outer peripheral wall portion 52 on the outer peripheral side is positioned inward in the left-right direction with respect to the mounting base portion 51 on the inner peripheral side. The mounting base portion 51 of the body 45 may be fixed to the outer ring mounting portion 47 of the inner ring body 44. As shown in FIG. 9, the outer ring mounting portion 47 of the inner ring body 44 changes from the state of FIG. Also, the position of the outer peripheral wall 52 of the drive wheel 6 or the central portion of the crawler 7 in the left-right direction is inward in the left-right direction with respect to the mounting portion 43 on the rear axle 33 side. Change position.

  With respect to the change movement of the driving wheel 6, the front and rear driven wheels 3, 4 and the idler wheel 5 of the track frame 2 inward in the left-right direction, the spacer member 77 is removed from between the support plate 71 and the support cylinder 72, and thereafter When the hydraulic cylinder 82 is contracted, the swinging shaft 8 moves inward in the left-right direction with respect to the support cylinder 72 as shown by a chain line in FIG. Since the gap with the support cylinder 72 is increased, a spacer member 77 is externally fitted to the inner end of the swing shaft 8 in the left-right direction so that the support plate 71 and the support cylinder 72 on the inner side in the left-right direction are fitted. It is only necessary to intervene, and the left-right movement of the swing shaft 8 is restricted in a state where the swing shaft 8 is moved inward in the left-right direction with respect to the support cylinder 72. As a result, the pair of left and right track frames 2 move inward in the left-right direction so as to approach each other due to the reduction operation of the hydraulic cylinder 82, corresponding to the change in position in the left-right direction on the outer peripheral side of the drive wheel 6. The front and rear driven wheels 3 and 4 and the idler wheel 5 are repositioned inward in the left-right direction.

  When the tread of the crawler type traveling device 1 is changed from the state shown in FIG. 9, the inner ring body 44 is reversed left and right as shown in FIG. 8, and the mounting base portion 46 of the inner ring body 44 is attached to the mounting portion 42 on the front axle 33 side. After that, the outer ring body 45 is left oriented so that the outer peripheral wall portion 52 on the outer peripheral side is positioned inward in the left-right direction with respect to the mounting base portion 51 on the inner peripheral side, and the mounting base portion 51 of the outer ring body 45 is moved to the inner ring. The outer ring mounting portion 47 of the inner ring body 44 may be fixed to the outer ring mounting portion 47 of the body 44, and the position of the outer ring mounting portion 47 of the inner ring body 44 is changed to the outer side in the left and right directions as shown in FIG. Then, the position of the outer peripheral wall 52 of the driving wheel 6 or the central portion in the left-right direction of the crawler 7 is changed to the outer side in the left-right direction on the inner side in the left-right direction with respect to the mounting portion 43 on the rear axle 33 side.

  Regarding the change movement of the driving wheel 6, the front and rear driven wheels 3, 4 and the idler wheel 5 of the track frame 2 outward in the left-right direction, the spacer member 77 is removed from between the support plate 71 and the support cylinder 72, and thereafter When the hydraulic cylinder 82 is extended, as shown by the solid line in FIG. 6, the swing shaft 8 moves outward in the left-right direction with respect to the support cylinder 72, and the support plate 71 on the outer side in the left-right direction Since the gap with the support cylinder 72 is increased, a spacer member 77 is externally fitted to the inner end of the swing shaft 8 in the left-right direction so that the support plate 71 and the support cylinder 72 on the outer side in the left-right direction are fitted. It is only necessary to intervene, and the left-right movement of the swing shaft 8 is restricted in a state where the swing shaft 8 is moved outward in the left-right direction with respect to the support cylinder 72. As a result, the extension operation of the hydraulic cylinder 82 causes the pair of left and right track frames 2 to move outward in the left-right direction so as to be separated from each other, and corresponds to the position change to the outer side in the left-right direction on the outer peripheral side of the drive wheel 6. Thus, the position of the front and rear driven wheels 3 and 4 and the idler wheel 5 is changed outward in the left-right direction.

Accordingly, it is possible to change the tread of the crawler type traveling device 1 with the simple structure on the inner side in the left-right direction with respect to the normal rear tire mounting position, and the tread change of the crawler type traveling device 1 within an appropriate range. be able to.
Moreover, since a hydraulic cylinder (driving means) 82 for moving the track frame 2 in the left-right direction with respect to the rear axle case 34 is provided, in response to the position change in the left-right direction on the outer peripheral side of the drive wheel 6, The truck frame 2 can be easily moved in the left-right direction with respect to the rear axle case 34 without requiring a large force, and corresponds to the position change to the left-right direction outward on the outer peripheral side of the drive wheel 6. The front and rear driven wheels 3 and 4 and the idler wheel 5 can be easily repositioned outward in the left-right direction, and the entire operation of changing the tread width of the crawler type traveling device 1 becomes very easy.

  10 and 11 show another embodiment, and a support member 91 having a U-shaped cross section is provided at the outer end of the rear axle 33 in the left-right direction. The support member 91 is integrally formed with a disc-shaped mounting portion 92 on the center side and a cylindrical support portion 93 on the outer peripheral side, and the support member 91 is superposed on the outer end surface of the rear axle 33 so as to be bolt nuts or the like. It is fastened and fixed by a fastener 94. The drive wheel 6 is formed in a disc shape with an open central portion, and a cylindrical support tube portion 96 is provided in the central portion. The drive wheel 6 is externally fitted to the support portion 93 of the support member 91 via the support cylinder portion 96 so as to be movable in the left-right direction, and is surrounded between the support cylinder portion 96 of the drive wheel 6 and the support portion 93 of the support member 91. A plurality of keys 97 are fitted at intervals in the direction so that the drive wheel 6 does not rotate relative to the support member 91 or the rear axle 33 around the axis.

  As in the case of the above-described embodiment, the track frame 2 can swing around the axis of the swing shaft 8 with respect to the rear axle case 34 together with the swing shaft 8 and can move in the left-right direction. By supporting the hydraulic cylinder (driving means) 82 by removing the spacer member 77 from between one of the pair of support plates 71 and the support cylinder 72, the outer peripheral side of the swing shaft 8 or the drive wheel 6 is driven. The swing shaft 8 is moved together with the track frame 2 with respect to the support cylinder 72 so that the front and rear driven wheels 3, 4 and the idler wheel 5 can be changed in the horizontal direction. It is configured to move in the left-right direction.

Then, in the pair of left and right crawler type traveling devices 1, the swing shaft 8 and the drive wheel 6 are connected by the connecting member 98, whereby the drive wheel 6 moves to the left and right in conjunction with the left and right movement of the swing shaft 8. Thus, the tread width of the pair of crawler type traveling devices 1 can be changed in conjunction with each other.
According to the above embodiment, when changing the tread from the state shown by the solid line in FIG. 10 to the inner side in the left-right direction, the spacer member 77 is removed from between the support plate 71 and the support cylinder 72, and then the hydraulic cylinder 82. When the movement is reduced, the swing shaft 8 moves inward in the left-right direction with respect to the support cylinder 72 as indicated by a chain line in FIG. At this time, since the oscillating shaft 8 and the drive wheel 6 are connected by the connecting member 98, a pair of left and right as shown by a chain line in FIG. The drive wheels 6 move inward in the left-right direction with respect to the support members 91. Thereafter, the movement of the rocking shaft 8 inward in the left-right direction opens a space between the support plate 71 and the support cylinder 72 on the inner side in the left-right direction. The spacer member 77 may be externally fitted and interposed between the support plate 71 and the support cylinder 72 on the inner side in the left-right direction. The left-right movement of the rocking shaft 8 is restricted in the state of moving to the side, and the movement of the drive wheel 6 in the left-right direction is also restricted by the restriction of the rocking shaft 8 in the left-right direction. As a result, due to the reduction operation of the hydraulic cylinder 82, the pair of left and right drive wheels 6 change the position inward in the left-right direction, and the pair of left and right track frames 2 move inward in the left-right direction so as to approach each other. Corresponding to the position change inward in the left-right direction on the outer peripheral side of the wheel 6, the front and rear driven wheels 3, 4 and the idler wheel 5 are changed in position in the left-right direction.

  Further, when changing the tread from the state indicated by the chain line in FIG. 10 to the outer side in the left-right direction, the spacer member 77 is removed from between the support plate 71 and the support cylinder 72 and then the hydraulic cylinder 82 is extended. As shown by the solid line in FIG. 10, the swing shaft 8 moves outward in the left-right direction with respect to the support cylinder 72. At this time, a pair of left and right drive wheels 6 move outward in the left-right direction with respect to each support member 91 as shown by a solid line in FIG. Thereafter, the movement of the oscillating shaft 8 outward in the left-right direction opens a space between the support plate 71 and the support cylinder 72 on the outer side in the left-right direction. The spacer member 77 may be externally fitted and interposed between the support plate 71 and the support cylinder 72 on the outer side in the left-right direction, and the swing shaft 8 may be on the outer side in the left-right direction with respect to the support cylinder 72. In this state, the left and right movement of the swing shaft 8 is restricted, and the left and right movement of the drive wheel 6 is also restricted by the restriction of the swing shaft 8 in the left and right direction. As a result, the extension operation of the hydraulic cylinder 82 changes the position of the pair of left and right drive wheels 6 outward in the left-right direction and moves the pair of left and right track frames 2 outward in the left-right direction so as to be separated from each other. The front and rear driven wheels 3 and 4 and the idler wheel 5 are repositioned outward in the left-right direction in response to the position change in the left-right direction outward on the outer peripheral side of the wheel 6.

Accordingly, it is possible to change the tread of the crawler type traveling device 1 with a simple structure. Further, by driving the hydraulic cylinder (driving means) 82, the position change in the left-right direction on the outer peripheral side of the driving wheel 6 and the track frame can be performed. 2 can be easily changed without requiring a large force, and the position of the outer peripheral side of the drive wheel 6 can be changed to the outside in the left-right direction, and the front and rear driven wheels 3, 4 can be changed. And the position change of the idler wheel 5 in the left-right direction can be made at the same time, and the operation of changing the tread width of the crawler type traveling device 1 becomes very easy.
In the present invention, the shape of each member and the positional relationship between the front, rear, left, and right in the above embodiment are not limited to the above embodiment, and various modifications and combinations of members and configurations may be made. You can also.

For example, there may be four idle wheels 5, only the rear two wheels may be supported by the equalizer link 20, and the remaining two front wheels may be individually supported by the track frame 2, or the front two wheels And the rear two wheels may be supported by the equalizer link 20, respectively.
Further, in the above-described embodiment, the swinging shaft 8 is inserted and held in the support cylinder 72 fixed to the rear axle case 34 so as to be movable in the left-right direction, and the swinging shaft 8 is expanded and contracted by the hydraulic cylinder 82. By changing the movement in the left and right direction, the track frame 2 to the front and rear driven wheels 3 and 4 and the idler wheel 5 are moved and changed in the left and right direction. Instead, for example, the track frame 2 is extended. The pedestal 66 is supported so as to be movable left and right, or the extended table 66 is supported movably to the left and right with respect to the support member 65. You may do it.

In the above embodiment, the drive means for moving the track frame 2 in the left-right direction with respect to the rear axle case 34 so that the front and rear driven wheels 3, 4 and the idler wheel 5 can be changed in position in the left-right direction. Although the hydraulic cylinder 82 is used, instead of this, an electric motor, a hydraulic motor or other driving means may be used as the driving means for moving the track frame 2 in the left-right direction.
In the embodiment, the outer peripheral wall portion 52 of the outer ring body 45 has a lateral displacement difference between the mounting base portion 46 of the outer ring body 45 and the outer peripheral wall portion 52, and the mounting base portion 46 of the inner ring body 44 and the outer ring mounting portion. However, instead of this, the horizontal displacement difference between the mounting base portion 46 of the inner ring body 44 and the outer ring mounting portion 47 is set as the mounting base portion 46 of the outer ring body 45. And the displacement difference in the left-right direction between the outer peripheral wall 52 and the outer peripheral wall 52 may be set larger. In this case, the inner ring body 44 is attached to the mounting portion 43 on the rear axle 33 side, and the outer ring body 45 is reversed left and right with respect to the inner ring body 44 and is detachably attached to the outer ring mounting portion 47 of the inner ring body 44. The position of the outer peripheral wall portion 52 of the outer ring body 45 can be changed in the left-right direction on the inner side in the left-right direction with respect to the mounting portion 42 on the rear axle 33 side.

It is a side view of the tractor which shows one Embodiment of this invention. It is a side view of the crawler type traveling device. It is a back sectional view of the crawler type traveling device. It is a plane sectional view of the tension adjustment mechanism. It is a back sectional view of the drive wheel portion. It is side surface sectional drawing of the pivot shaft part of the track frame. It is the sectional view on the AA line of the same FIG. It is a back sectional view of the drive wheel portion. It is a back sectional view of the drive wheel part in the state where the tread was changed. It is a back sectional view of a crawler type traveling device showing other embodiments. It is a side view of the drive wheel part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crawler type traveling device 2 Track frame 3 Front driven wheel 4 Rear driven wheel 5 Idle wheel 6 Drive wheel 7 Crawler 8 Oscillating shaft 30 Traveling machine body 33 Rear axle 34 Rear axle case 71 Support body 72 Support cylinder body 77 Spacer member 82 Hydraulic cylinder (drive means)

Claims (6)

A drive wheel (6) is attached to the rear axle (33) of the traveling machine body (30), and a truck is mounted on a rear axle case (34) supporting the rear axle (33) via a left and right swing shaft (8). The frame (2) is supported so as to be swingable around the swing shaft (8), front and rear driven wheels (3, 4) are disposed at the front and rear ends of the track frame (2), and an idler wheel ( 5) is provided, and the crawler (7) is wound around the driving wheel (6), the front and rear driven wheels (3, 4) and the idler wheel (5), and the crawler (7) can be changed and adjusted in the horizontal direction. In this way, the outer peripheral side of the drive wheel (6) can be changed in the left-right direction, and the track frame (2) is supported so as to be movable in the left-right direction with respect to the rear axle case (34) side. In the device
Corresponding to the position change in the left and right direction on the outer peripheral side of the drive wheel (6), the front and rear driven wheels (3, 4) and the idler wheel (5) can be changed in position in the left and right direction. 2. A crawler type traveling device characterized in that driving means for moving 2) in the left-right direction with respect to the rear axle case (34) is provided.   A support cylinder (72) in the left-right direction is fixed to the rear axle case (34), and the swing shaft (8) is rotatable about the axis and movable in the left-right direction on the support cylinder (72). The track frame (2) is connected to the swing shaft (8), and the drive means moves the swing shaft (8) along with the track frame (2) to the left and right with respect to the support cylinder (72). The crawler type traveling device according to claim 1, wherein the crawler type traveling device is configured to move in a direction.   The swing shaft (8) is formed longer in the left-right direction than the support cylinder (72), and a pair of support plates (71) are fixedly provided at both ends of the swing shaft (8). 8) Between the one support plate (71) and the support cylinder (72) of the pair of support plates (71) or the other support plate so as to restrict the right and left movement of the support cylinder (72). The crawler type traveling device according to claim 2, wherein a spacer member (77) selectively interposed is provided between the support cylinder (71) and the support cylinder (72).   A hydraulic cylinder (82) is provided as the drive means, and one end side of the hydraulic cylinder (82) is connected to the swing shaft (8) to move the swing shaft (8) left and right by the expansion and contraction of the hydraulic cylinder (82). The crawler type traveling device according to claim 2, wherein the crawler type traveling device is provided.   The driving wheel (6) is supported on the rear axle (33) of the traveling machine body (30) so as to be movable in the left-right direction and not to be relatively rotatable. The driving wheel (6) is interlocked with the left-right movement of the swinging shaft (8). The crawler type traveling device according to any one of claims 2 to 4, wherein the drive shaft (6) is connected to the swing shaft (8) so as to move left and right. The crawler type traveling device according to any one of claims 2 to 5 is provided on the left and right outer ends of the axle case (34) in a pair of left and right, and the drive wheels (6) and crawlers (7) ) And the track frame (2) are provided corresponding to the left and right respectively, and the vehicle having a pair of left and right crawler type traveling devices provided with the left and right swing shafts (8) corresponding to the left and right,
A hydraulic cylinder (82) is supported as the drive means so as to be movable left and right between the pair of left and right swing shafts (8), and the pair of left and right track frames (2) are moved left and right by expansion and contraction of the hydraulic cylinder (82). One end side of the hydraulic cylinder (82) is connected to one swing shaft (8) and the other end side of the hydraulic cylinder (82) is connected to the other swing shaft (8) so as to move toward and away in the direction. A vehicle having a pair of left and right crawler type traveling devices.

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