JP2015051688A - Crawler travel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply adjust tension of a crawler belt even in such a structure that a tension mechanism is exposed to the exterior.SOLUTION: A tension adjustment mechanism 43 includes a first screw part 46 and a second screw part 47 respectively dispersed toward a truck frame 20 and a support body 29. The support body 29 is movable with respect to the truck frame 20 in a vehicle body longitudinal direction by engagement between the first screw part 46 and the second screw part 47. A grease supply part 59 capable of supplying grease to the engaged portion between the first screw part 46 and the second screw part 47.

Description

  The present invention relates to a crawler traveling device used for a work vehicle such as a combine.

  In the crawler traveling device, a track frame supported by the body frame and extending in the longitudinal direction of the vehicle body, a drive wheel disposed on the front side of the track frame, a tension wheel disposed on the rear side of the track frame, and a drive wheel And a crawler belt wound around the tension wheel, and a plurality of wheels are provided between the drive wheel and the tension wheel, and the crawler belt is guided to the ground by the plurality of wheels. (For example, refer to Patent Document 1).

  In the crawler traveling device described in Patent Document 1, the tension wheel is not fixed to the track frame, but the track frame supports the support body that rotatably supports the tension wheel so as to be movable in the longitudinal direction of the vehicle body. ing. In order to adjust the tension of the crawler belt, a tension adjusting mechanism that can adjust the position of the tension wheel in the vehicle longitudinal direction with respect to the track frame is provided.

  The tension adjusting mechanism includes a screw shaft disposed between the track frame and the support body, and a screw portion disposed on the support body through which the screw shaft can be inserted. The screw shaft and the screw portion are screwed. Accordingly, the position of the tension wheel in the longitudinal direction of the vehicle body is adjusted by moving the support body in the longitudinal direction of the vehicle body with respect to the track frame. The screw shaft is provided so as to be rotatable with respect to the track frame. When the operator rotates the screw shaft, the screw shaft and the screw portion are screwed together to support the track frame. Moves in the longitudinal direction of the vehicle body.

JP 2011-20512 A

  In the crawler traveling device described in Patent Document 1, since the screw shaft and the screw portion in the tension mechanism are exposed to the outside, muddy water, foreign matter, etc. are mixed between the screw shaft and the screw portion. There is a possibility that the screw shaft and the screw portion are fixed due to fixing as they are or rusting due to mixing of muddy water. As described above, when the screw shaft and the screw portion are fixed, in order to adjust the tension of the crawler belt, it is necessary to perform an operation of removing the adhered matter or rust between the screw shaft and the screw portion. , It was time consuming.

  In addition, it is conceivable to provide a cover that covers the tension adjusting mechanism between the screw shaft and the screw portion in order to prevent entry of muddy water or foreign matter. This will increase complexity and cost.

  Therefore, there is a demand for a crawler traveling device that can easily adjust the tension of the crawler belt even when the tension mechanism is exposed to the outside.

The crawler traveling device according to the present invention includes a drive wheel that can be driven and rotated, a tension wheel that is spaced from the drive wheel in the longitudinal direction of the vehicle body, and the drive wheel and the tension wheel. A wound crawler belt, a support that rotatably supports the tension wheel, a track frame that supports the support so as to be movable in the vehicle longitudinal direction, and the tension wheel in the vehicle longitudinal direction with respect to the track frame And a tension adjustment mechanism for adjusting the position of
The tension adjusting mechanism includes a first screw portion and a second screw portion dispersed on the track frame side and the support body side, and the track is formed by screwing the first screw portion and the second screw portion. The support body is configured to be movable in the longitudinal direction of the vehicle body with respect to the frame,
There is a grease supply section that is capable of supplying grease to a screwed portion between the first screw section and the second screw section.

  According to this characteristic configuration, since the grease can be supplied to the screwed portion between the first screw portion and the second screw portion by the grease supply portion, mud or foreign matter in the screwed portion can be obtained by supplying the grease. It is possible to prevent the occurrence of adhesion and rust. Accordingly, even when the tension mechanism is exposed to the outside, the first screw portion and the second screw portion can be prevented from being fixed, and the tension of the crawler belt can be easily adjusted.

  According to a further characteristic configuration of the crawler traveling device according to the present invention, the first screw portion is formed on an outer peripheral portion of a rod-like body extending in the vehicle longitudinal direction across the track frame and the support body, The second screw portion is formed in an inner wall portion of a cylindrical body that can be inserted through the rod-shaped body.

  According to this characteristic configuration, the rod-like body having the first screw portion formed on the outer peripheral portion is provided so as to extend in the vehicle body longitudinal direction across the track frame and the support body, and the second screw portion is formed on the inner wall portion. The tension adjusting mechanism can be simply configured only by providing the cylindrical body on the track frame or the support body so that the rod-shaped body is inserted. Moreover, when providing the grease supply section, for example, the rod-shaped body or the cylindrical body can be provided with the grease supply section so that the grease is supplied between the outer peripheral portion of the rod-shaped body and the inner wall portion of the cylindrical body. It is easy to provide a grease supply unit.

  According to a further characteristic configuration of the crawler traveling device according to the present invention, the cylindrical body is disposed on the track frame or the support body, and the first screw portion is at least the cylindrical body in the longitudinal direction of the vehicle body in the rod-shaped body. It exists in the point formed in the penetration part penetrated by a body.

  According to this characteristic configuration, the first screw portion does not need to be formed over the entire length in the longitudinal direction of the vehicle body in the rod-like body, and the second screw of the cylindrical body is formed only by forming the first screw portion in the insertion portion. The screwing with the part can be performed appropriately. Therefore, the first screw portion is not formed longer than necessary, the configuration can be simplified, and the exposure amount of the first screw portion to the outside can be minimized, so that the first screw portion can be reduced. Of mud and the generation of rust at the first screw portion can be suppressed.

  A further characteristic configuration of the crawler traveling device according to the present invention is that the cylindrical body is provided with a guide groove portion that guides and supplies the grease from the grease supply portion to the screwing portion.

  According to this characteristic configuration, when the grease is supplied from the grease supply unit, the grease is guided and supplied to the screwing site by the guide groove portion, so that the grease can be appropriately supplied to the screwing site.

  A further characteristic configuration of the crawler traveling device according to the present invention is such that the guide groove portion extends radially inward from the outer peripheral portion of the cylindrical body, and an inner wall portion on which the outer peripheral portion and the second screw portion are formed. It is in the point comprised so that it may penetrate.

  According to this characteristic configuration, the insertion hole can be configured as a guide groove portion by including the insertion hole extending radially inward from the outer peripheral portion of the cylindrical body and inserting the outer peripheral portion and the inner wall portion. The guide groove can be simply configured.

  The crawler traveling device according to the present invention is further characterized in that the rod-like body is supported so as to be freely rotatable, and the cylindrical body rotates to the arrangement target member using the track frame or the support body as the arrangement target member. It is in that it is prepared for inoperability.

  According to this characteristic configuration, when the operator rotates the rod-shaped body, the first screw portion of the rod-shaped body and the second screw portion of the cylindrical body are screwed together with the rotation operation, and the rotation target cannot be operated on the arrangement target member. The cylindrical body provided in is moved in the axial direction of the rod-shaped body. Since the rod-shaped body extends in the longitudinal direction of the vehicle body, the axial direction of the rod-shaped body is the longitudinal direction of the vehicle body, and the cylindrical body and the arrangement target member move integrally in the longitudinal direction of the vehicle body. By moving the arrangement target member, the support body can be moved in the longitudinal direction of the vehicle body with respect to the track frame. In adjusting the tension, the operator only needs to rotate the rod-shaped body, and the rotation target is not a cylindrical body, but a rod-shaped body extending in the longitudinal direction of the vehicle body. Therefore, the operation target is long in the longitudinal direction of the vehicle body, and the rotation operation itself is easy to perform.

  A further characteristic configuration of the crawler traveling device according to the present invention is that the arrangement target member includes a rotation restricting portion that abuts on an outer peripheral portion of the tubular body and restricts the rotation of the tubular body. .

  By rotating the rod-like body, the first screw portion of the rod-like body and the second screw portion of the tubular body are screwed together, so that a rotational force acts on the tubular body. Therefore, when the cylindrical body is moved relative to the rod-shaped body, it is required to support the cylindrical body so as to withstand this rotational force. Therefore, according to this characteristic configuration, the rotation restricting portion abuts on the outer peripheral portion of the tubular body to restrict the rotation of the tubular body, so that fixing work such as welding is not required, and the tubular body is prevented from rotating. The structure for supporting can be simplified.

  The crawler traveling device according to the present invention is further characterized in that the rotation restricting portion is constituted by an extending wall portion extending from the arrangement target member, and the cylindrical body is formed on the extending wall portion. It is in the point that is arranged in the enclosed space.

  According to this characteristic configuration, the rotation restricting portion can be configured only by providing the extending wall portion on the arrangement target member, and the configuration of the rotation restricting portion can be simplified. In addition, for example, when the outer peripheral portion of the cylindrical body has a flat surface, when a rotational force acts on the cylindrical body, the flat outer peripheral portion of the cylindrical body and the extending wall portion are in surface contact. The area of the contact portion can be increased as much as possible, and the rotation of the cylindrical body can be appropriately restricted.

  In a further characteristic configuration of the crawler traveling device according to the present invention, the extending wall portion surrounds the outer peripheral portion of the cylindrical body in a state where a part of the outer peripheral portion of the cylindrical body is opened outward. It is comprised and the said grease supply part exists in the point arrange | positioned in the site | part open | released outward among the outer peripheral parts of the said cylindrical body.

  According to this characteristic configuration, a part of the outer peripheral portion of the cylindrical body is opened outward, and the grease supply unit is disposed in the part opened outward, so that the grease supply unit by the operator Therefore, the workability can be improved and workability can be improved.

  A further characteristic configuration of the crawler traveling device according to the present invention is that the cylindrical body is formed separately from the arrangement target member with the track frame or the support body as the arrangement target member. It is in the point where it is arranged.

  According to this characteristic configuration, the cylindrical body and the arrangement target member can be individually manufactured by forming the cylindrical body separately from the arrangement target member, so that the production can be simplified. Can do. In addition, when placing the cylindrical body on the placement target member, it is possible to select a placement position suitable for inserting the rod-like body in consideration of the relative position with the rod-like body, and the degree of freedom of the placement position increases. It will be.

Combine side view Side view of crawler traveling device Enlarged side view showing tension wheel and tension adjustment mechanism Plan sectional view showing tension wheel and tension adjusting mechanism A longitudinal sectional view from the rear side showing the tension wheel and tension adjustment mechanism Disassembled perspective view of tension adjustment mechanism Plan sectional drawing which shows the tension ring and tension adjustment mechanism in another embodiment The top view which shows the tension adjustment mechanism in another embodiment The top view which shows the tension adjustment mechanism in another embodiment

An example of application to an ordinary combine as a work vehicle to which the crawler traveling device according to the present invention is applied will be described with reference to the drawings.
As shown in FIG. 1, the combine includes a pair of left and right crawler traveling devices 1 below a body frame 2 extending in the longitudinal direction of the vehicle body. The pair of left and right crawler traveling devices 1 are disposed below a driver seat 3. It is configured to self-run by being driven by a driving force from an engine (not shown) provided. A cutting part 4 is provided at the front of the machine frame 2, and a threshing device 5 and a grain tank 6 are provided at the rear of the machine frame 2. The mowing unit 4 is configured to be swingable up and down by a hydraulic cylinder 7 between a lowered working position and a raised non-working position. In this combine, harvesting work such as rice and wheat is performed by running the traveling machine body with the cutting unit 4 in the descending work position.

  The mowing unit 4 conveys the rotary reel 8 that scrapes the crop head to be harvested toward the rear, the clipper type mowing device 9 that cuts and harvests the crop stock, and the grain straws to the rear side of the machine body. A conveying device (feeder) 10 that supplies the threshing device 5 is provided. The grain tank 6 collects and stores the threshed grains conveyed from the threshing device 5. The stored threshing grains can be carried out to the outside by the auger 11.

  As shown in FIG. 2, the crawler traveling device 1 includes a track frame 20 supported by the machine body frame 2 of the work vehicle. FIG. 2 illustrates the crawler traveling device 1 on the left side in the forward direction. Hereinafter, the crawler traveling device 1 will be described. Since the crawler traveling device 1 on the left in the forward direction and the crawler traveling device 1 on the right in the forward direction have the same configuration, only the crawler traveling device 1 on the left in the forward direction will be described. .

  The track frame 20 extends in the longitudinal direction of the vehicle body. Drive wheels 21 are disposed in front of the track frame 20, tension wheels 22 are disposed in the rear of the track frame 20, and the drive wheels 21 and the tension wheels 22 are disposed at intervals in the front-rear direction of the vehicle body. A rubber crawler belt 23 is wound around the drive wheel 21 and the tension wheel 22, and a plurality of lower rolling wheels 24 for guiding the crawler belt 23 in the ground direction are disposed below the track frame 20. An upper roller 25 for guiding and supporting the crawler belt 23 is disposed above the rear portion of the track frame 20.

  The track frame 20 is supported by the body frame 2 in such a manner that it is suspended from the body frame 2 via a front bracket 26 and a rear bracket 27. The drive wheel 21 is supported by the mission case 28 and is configured to be rotationally driven by the driving force from the engine transmitted in the mission case 28. The tension wheel 22 is rotatably supported by a support 29, and the support 29 is supported so as to be movable in the longitudinal direction of the vehicle body with respect to the track frame 20. The plurality of lower rollers 24 are rotatably supported by a mounting unit 30 that is divided into a front side and a rear side, and the mounting unit 30 is fixed to the track frame 20. In this embodiment, the six lower wheels 24 are divided into two front and rear groups consisting of three lower wheels 24, and each group is attached to a mounting unit 30 that is divided into a front side and a rear side. The upper roller 25 is rotatably supported by a support bracket 31, and the support bracket 31 is fixed to the track frame 20.

  As shown in FIGS. 2 and 5, the crawler belt 23 is provided with a plurality of core bars 32 embedded at a constant pitch spaced in the circumferential direction of the belt. A pair of left and right cored bar projections 33 projecting to the peripheral surface side are provided. Although not shown in the drawing, the crawler belt 23 has drive holes formed between the core bars 32 in the belt circumferential direction, and the engagement protrusions 21a of the drive wheels 21 are sequentially engaged with the drive holes. Thus, the forward drive force or the reverse drive force is transmitted to the crawler belt 23.

  Although not shown, the plurality of lower rollers 24 and upper rollers 25 have an outer roller and an inner wheel spaced apart in the belt lateral width direction, and the pair of left and right cored bar protrusions 33 are connected to the outer wheel. In this state, the crawler belt 23 is guided and supported in a state of being sandwiched between the inner ring and the inner ring. The tension ring 22 is configured to pass between a pair of left and right cored bar protrusions 33 in the belt width direction. Further, the crawler traveling device 1 includes a crawler guide 34 fixed to the attachment unit 30. The crawler guide 34 is configured to prevent the crawler belt 23 from coming off by passing between the pair of left and right cored bar projections 33 in the belt width direction.

  Hereinafter, in the figure, the front-rear direction of the vehicle body is defined as the X direction, the vertical direction is defined as the Y direction, and the lateral direction of the vehicle body is defined as the Z direction.

(Tension ring support structure)
As shown in FIGS. 3, 4, and 6, the support body 29 that rotatably supports the tension wheel 22 includes a cylindrical first frame 35 that extends from the front side in the vehicle longitudinal direction (X direction in the figure). A plate-like second frame 36 connected to the rear end portion of the first frame 35 and extending in the vertical direction (Y direction in the figure) and the vehicle body lateral width direction (Z direction in the figure), and rearward from the second frame 36 A pair of left and right plate-like third frames 37 extending to the side are provided, and a tension wheel 22 is rotatably supported at a rear end portion of the third frame 37. By the way, there is an advantage that the weight can be reduced by making the first frame 35 cylindrical.

  The first frame 35 is formed so that the outer peripheral shape of the cross section coincides with the inner peripheral shape of the cross section of the track frame 20, and is configured to be fitted in the track frame 20 formed in a cylindrical shape. For example, the track frame 20 is configured by a square pipe having a square cross section, and the first frame 35 is also configured by a square pipe having a square cross section. The cross-sectional shape is not limited to a quadrangle, and other various shapes such as a polygon can be applied. The first frame 35 is provided so as to be slidable in the longitudinal direction of the vehicle body on the inner wall portion of the track frame 20 while being fitted inside the track frame 20.

  The second frame 36 is formed in a plate shape extending in the up-down direction and the vehicle body lateral width direction than the first frame 35. The first frame 35 is connected so as to extend forward from the front center portion of the second frame 36. The front surface of the second frame 36 is provided with a pair of left and right first upright walls 38 extending forward from the front surface. The pair of left and right first standing wall portions 38 are arranged at intervals in the vehicle body width direction, and the first frame 35 is sandwiched between the pair of left and right first standing wall portions 38 in the vehicle body width direction. ing. Thereby, for example, the first frame 35 can be connected not only to the second frame 36 but also to the pair of left and right first standing wall portions 38, and the first frame 35 can be firmly supported. it can. The pair of left and right first standing wall portions 38 are formed to be wide in the vertical direction and extend forward from the second frame 36. The pair of left and right first standing wall portions 38 are formed in a trapezoidal shape (see FIG. 3) in a side view in which a front side portion is narrower than a rear side portion.

  In addition to the pair of left and right first standing wall portions 38, a pair of upper and lower first connection wall portions 39 is provided on the front surface portion of the second frame 36. The pair of upper and lower first connecting wall portions 39 includes two pairs, one pair on the both sides in the vehicle body width direction, with one pair of the upper and lower pairs spaced in the vertical direction as one pair. The pair of upper and lower first connection wall portions 39 are formed in a plate shape extending in the lateral width direction of the vehicle body so as to connect the front surface portion of the second frame 36 and the first standing wall portion 38. The pair of upper and lower first connecting wall portions 39 are arranged at positions overlapping the first frame 35 in the vertical direction in the second frame 36 (see FIG. 3). It is narrower than the rear part, and is formed in a triangular shape (see FIG. 4) in plan view. By providing such a connecting wall portion, the strength of the support 29 itself is improved, and the tension wheel 22 can be stably and firmly supported by the support 29.

  The third frame 37 is provided in a pair of left and right sides spaced apart in the lateral direction of the vehicle body, and is formed in a plate shape that is wide in the vertical direction extending rearward from the rear surface portion of the second frame 36. In this manner, the pair of left and right third frames 37 are spaced apart in the vehicle body width direction, and the space between them is used as the installation space for the tension wheel 22. The third frame 37 is disposed at a position that is substantially bilaterally symmetric with respect to the central portion in the vehicle body width direction in the second frame 36, and the lateral width of the third frame 37 is narrower at the rear side portion than at the front side portion. It is formed in a triangular shape (see FIG. 3) when viewed. A shaft portion 40 is provided over the rear end portions of the pair of left and right third frames 37, and the tension wheel 22 is rotatably supported by the shaft portion 40 between the pair of left and right third frames 37.

  The rear surface portion of the second frame 36 is also provided with a pair of upper and lower second connection wall portions 41 and a pair of upper and lower third connection wall portions 42. As shown in FIG. 4, the pair of upper and lower second connection wall portions 41 are provided outside the pair of left and right third frames 37 in the vehicle body width direction (Z direction in the drawing), and the pair of upper and lower third connection wall portions 42. Is provided inside the pair of left and right third frames 37 in the vehicle body width direction. The pair of upper and lower second connection wall portions 41 and the pair of upper and lower third connection wall portions 42 are formed in a plate shape extending in the lateral direction of the vehicle body so as to connect the rear surface portion of the second frame 36 and the third frame 37. Yes. In addition, the pair of upper and lower second connection wall portions 41 and the pair of upper and lower third connection wall portions 42 are a pair of upper and lower pairs spaced apart in the vertical direction, one set on each side in the lateral direction of the vehicle body. A set is provided. Further, the pair of upper and lower second connection wall portions 41 and the pair of upper and lower third connection wall portions 42 are triangular in a plan view in which the width in the lateral direction of the vehicle body is narrower in the rear side portion than in the front side portion. It is formed in a shape (see FIG. 4). The length in the longitudinal direction of the vehicle body is such that the pair of upper and lower third connection wall portions 42 is shorter than the pair of upper and lower second connection wall portions 41 so as to avoid interference with the tension wheel 22. .

  In this manner, the tension supported by the support 29 with respect to the track frame 20 is achieved by sliding the first frame 35 in the support 29 in the longitudinal direction of the vehicle body while being fitted inside the track frame 20. The wheel 22 is configured to be movably supported in the longitudinal direction of the vehicle body. Therefore, the crawler traveling device 1 is provided with a tension adjusting mechanism 43 that can adjust the position of the tension wheel 22 in the longitudinal direction of the vehicle body relative to the track frame 20 in order to adjust the tension of the crawler belt 23.

(Tension adjustment mechanism)
As shown in FIGS. 3, 4, and 6, the tension adjustment mechanism 43 is disposed on the support body 29 side, with a rod-shaped body 44 extending in the vehicle longitudinal direction across the track frame 20 and the support body 29. And a cylindrical body 45 through which the rod-shaped body 44 can be inserted. The tension adjusting mechanism 43 is supported to the track frame 20 by screwing a first screw portion 46 formed on the outer peripheral portion of the rod-like body 44 and a second screw portion 47 formed on the inner wall portion of the cylindrical body 45. The body 29 is configured to be movable in the longitudinal direction of the vehicle body. Incidentally, in this embodiment, the tension adjustment mechanism 43 is provided only on one side in the vehicle body width direction with respect to the track frame 20, but the tension adjustment mechanism 43 is provided on both sides in the vehicle body width direction with respect to the track frame 20. You can also.

  The rod-shaped body 44 is provided in a state in which both the first insertion hole 49 on the track frame 20 side and the second insertion hole 50 on the support 29 side are inserted. The rod-shaped body 44 is basically formed in a circular cross section, and the first insertion hole 49 and the second insertion hole 50 are also formed in a circular hole, and the rod-shaped body 44 is rotated. Supports operation freely. The first insertion hole portion 49 is formed at an extended end portion of the screw support 48 provided so as to extend from the rear end portion of the track frame 20 to the outside in the lateral direction of the vehicle body, and the second insertion hole portion 50 is The second frame 36 of the support 29 is formed at an outer portion than the first frame 35 and the third frame 37 in the lateral width direction of the vehicle body. In this manner, the rod-like body 44 is supported so as to be freely rotatable in a posture extending along the longitudinal direction of the vehicle body, positioned outside the track frame 20 and the tension wheel 22 in the lateral width direction of the vehicle body.

  The first insertion hole 49 is rotatable with respect to the screw support 48 in a state where relative movement between the screw support 48 and the rod 44 is not allowed in the axial direction of the rod 44. It is comprised so that it may support. The second insertion hole 50 is configured such that the rod-shaped body 44 can be inserted and removed in the axial direction of the rod-shaped body 44, and the second frame 36 and the rod-shaped body 44 of the support 29 are arranged in the axial direction of the rod-shaped body 44. Relative movement between is allowed.

  The rod-shaped body 44 has a first screw portion 46 formed on the outer peripheral portion thereof. However, the first screw portion 46 is not formed over the entire length of the rod-shaped body 44 in the longitudinal direction of the vehicle body. It is formed only in the insertion part 51 to be inserted into the. Since the rear side portion of the rod-like body 44 is inserted into the cylindrical body 45, the rear side portion is used as an insertion portion 51 as shown in FIG. 3, and the first screw portion 46 is formed in the insertion portion 51. Yes.

  The rod-shaped body 44 has a large-diameter flange portion 52 formed in the middle portion in the longitudinal direction of the vehicle body. The flange-shaped portion 52 abuts on a plate-shaped restricting body 53 inserted through the rod-shaped body 44, thereby The movement of the body 44 in the axial direction is restricted. The restricting body 53 is disposed between the screw support 48 and the flange portion 52 in the axial direction of the rod-shaped body 44.

  The front portion of the rod-shaped body 44 has an operation portion 54 whose cross-sectional shape is, for example, a hexagonal shape, and the operator operates the operation portion 54 with a jig such as a wrench so that the rod-shaped body 44 can be rotated. The operation unit 54 is provided with a plate-like detent 55 arranged so as to pass through the rod-shaped body 44 and a retaining pin 56 for retaining the detent 55. Although illustration is omitted, the rod-like body 44 is prevented from rotating by the outer peripheral portion of the rotation-preventing body 55 coming into contact with the surrounding wall portion or the like. Further, the retaining pin 56 abuts against the anti-rotation body 55, thereby preventing the anti-rotation body 55 from coming off the rod-shaped body 44.

  The cylindrical body 45 is formed separately from the support body 29 and is configured to move integrally with the support body 29. The cylindrical body 45 is disposed at a position overlapping the second insertion hole 50 in the front surface portion of the second frame 36, and the rod-shaped body 44 includes the first insertion hole 49, the cylindrical body 45 and the second insertion hole 50. The three insertion holes 50 are provided to be inserted. The cylindrical body 45 is composed of, for example, a nut having a square cross-sectional outer shape, and a first screw formed on the outer peripheral portion of the rod-shaped body 44 with a second screw portion 47 formed on the inner wall portion thereof. The portion 46 is screwed. The cross-sectional outer shape of the cylindrical body 45 is not limited to a quadrangular shape, and may be a shape having a flat surface on the outer periphery, such as a polygonal shape.

  The cylindrical body 45 is disposed in a space 57 surrounded by the first standing wall portion 38 and the pair of upper and lower first connection wall portions 39. The space 57 surrounds the inner side in the vehicle body width direction of the outer periphery of the cylindrical body 45 with the first upright wall portion 38 and surrounds both sides in the vertical direction with a pair of upper and lower first connecting wall portions 39. It is out. Accordingly, even if the cylindrical body 45 is also rotated in accordance with the rotation operation of the rod-shaped body 44, the outer peripheral portion of the cylindrical body 45 is at least one of the first standing wall portion 38 and the pair of upper and lower first connecting wall portions 39. It is comprised so that rotation of the cylindrical body 45 may be controlled by contacting. Therefore, the 1st standing wall part 38 and a pair of upper and lower 1st connection wall part 39 are comprised as a rotation control part and an extending wall part. The first upright wall portion 38 and the pair of upper and lower first connecting wall portions 39 are configured to be wider than the cylindrical body 45 in the longitudinal direction of the vehicle body, and appropriately prevent rotation of the cylindrical body 45. I am doing so. In this manner, the cylindrical body 45 is provided on the arrangement target member so that the support 29 is the arrangement target member and cannot be rotated.

  The cylindrical body 45 is provided with a grease supply portion 59 that supplies grease to a screwed portion 58 between the first screw portion 46 of the rod-shaped body 44 and the second screw portion 47 of the cylindrical body 45. This grease supply part 59 is comprised by the grease nipple, for example. Although the cylindrical body 45 is disposed in a space 57 surrounded by an outer peripheral portion thereof, the outer side in the lateral width direction of the space 57 is opened outward. Therefore, the grease supply unit 59 is disposed in the open portion 60 on the outer side of the outer periphery of the cylindrical body 45 and opened outward in the vehicle body width direction so that the worker can easily supply the grease. Yes. The open portion 60 is configured by a flat portion facing outward in the vehicle width direction, and in the flat portion, the grease supply portion 59 protrudes outward in the vehicle width direction at the center in the vertical direction and the vehicle longitudinal direction. Is provided.

  The cylindrical body 45 is provided with a guide groove portion 61 that guides and supplies the grease from the grease supply portion 59 to the screwing portion 58. The guide groove portion 61 is formed in a linear shape extending radially inward from the outer peripheral portion of the cylindrical body 45, and is configured to pass through the outer peripheral portion and the inner wall portion where the second screw portion 47 is formed. Has been. The grease supply portion 59 is provided at the outer diameter side end portion of the guide groove portion 61 in the radial direction of the cylindrical body 45.

(Operation of tension adjustment mechanism)
First, the operator can rotate the rod-shaped body 44 by removing the retaining pin 56 and the rotation-preventing body 55 from the rod-shaped body 44. When the operator rotates the rod-shaped body 44, the cylindrical body 45 is prevented from rotating by the first standing wall portion 38 and the pair of upper and lower first connecting wall portions 39, so the first screw portion 46 and the second screw portion 47. As a result, the cylindrical body 45 moves in the axial direction of the rod-shaped body 44. Here, the cylindrical body 45 is provided so as to come into contact with the second frame 36 of the support 29 from the front side, and the second frame 36 of the support 29 is attached to the cylindrical body 45 by the tension of the crawler belt 23. A force for urging forward is applied so as to be pressed against. That is, the cylindrical body 45 is brought into contact with the second frame 36 in a direction against the force acting by the tension of the crawler belt 23, so that the second frame and the cylindrical body 45 are moved in the longitudinal direction of the vehicle body. Is maintained. Thereby, when the cylindrical body 45 moves to the front side, the cylindrical body 45 and the support body 29 move integrally to the front side, and when the cylindrical body 45 moves to the rear side, the cylinder The body 45 and the support body 29 are moved integrally to the rear side. As described above, the cylindrical body 45 and the support body 29 move integrally in the longitudinal direction of the vehicle body, so that the first frame 35 of the support body 29 is slid in a state of being fitted in the track frame 20 and the track The support 29 moves in the longitudinal direction of the vehicle body relative to the frame 20. As a result, the tension wheel 22 supported by the support 29 moves in the vehicle body longitudinal direction with respect to the track frame 20 to adjust the tension of the crawler belt 23. For example, when the tension wheel 22 moves rearward, the tension of the crawler belt 23 can be adjusted to the tension side. When the adjustment work of the tension of the crawler belt 23 is completed, the retaining pin 56 and the rotation stopper 55 are attached to the rod-shaped body 44 to restrict the rotation of the rod-shaped body 44, thereby maintaining the adjusted tension. . The track frame 20, the support body 29, and the rod-shaped body 44 are arranged so that the centers in the vertical direction are substantially the same position, and the slide movement is performed with the first frame 35 fitted in the track frame 20. It can be done smoothly without drowning.

  Further, the operator supplies the grease with the grease supply unit 59, guides the grease with the guide groove portion 61, and supplies the grease to the screwed portion 58 of the first screw portion 46 and the second screw portion 47. I am doing so. By supplying the grease, it is possible to prevent the muddy water and foreign matters from being fixed and the generation of rust at the screwing portion 58.

(Tension ring grease seal configuration)
A grease seal configuration of the tension ring 22 will be described with reference to FIGS. 4 and 5. In FIG. 5, the lateral direction of the vehicle body is illustrated as the Z direction, and in addition, the inner side in the lateral direction of the vehicle body is indicated as Z1 and the outer side in the lateral direction of the vehicle body is indicated as Z2.

  The tension wheel 22 has a cylindrical portion 22 a at the center in the radial direction. The shaft portion 40 is inserted into the cylindrical portion 22 a and is rotatably supported by the shaft portion 40 via a bearing 62. The shaft portion 40 is formed in a columnar shape extending in the lateral width direction of the vehicle body, and is disposed in a state over the bearing portions 63 formed in each of the pair of left and right third frames 37 in the support 29. The shaft portion 40 has a nut 64 that protrudes inward (Z1 side in the Z direction in FIG. 5) and outward (Z2 side in the Z direction in FIG. 5) in the lateral direction of the vehicle body than the pair of left and right third frames 37. And are fixed to each of the pair of left and right third frames 37. A bearing 62 is interposed between the inner peripheral part of the tension ring 22 and the outer peripheral part of the shaft part 40 in the radial direction of the tension ring 22, and a grease storage space 65 is formed. In this embodiment, two bearings 62 are provided, but the number of the bearings 62 may be one or a plurality of two or more. Disposed between the bearings 62 is a discharge permitting member 71 that allows the grease to be discharged from the grease storage space 65 to the outside when the internal pressure of the grease in the grease storage space 65 becomes equal to or higher than the set pressure.

  In order to seal the grease in the grease storage space 65, a first oil seal 66 and a second oil seal 68 are provided. The first oil seal 66 is provided on the outside in the lateral direction of the vehicle body (Z2 side in the Z direction in FIG. 5), and the second oil seal 68 is on the inside in the lateral direction of the vehicle body (Z1 side in the Z direction in FIG. 5). Is provided. Both the first oil seal 66 and the second oil seal 68 are formed in a ring shape, and in the radial direction of the tension ring 22, the inner peripheral portion of the cylindrical portion 22 a of the tension ring 22 and the outer peripheral portion of the shaft portion 40 are formed. It is comprised so that a space may be sealed. The first collar body 67 is provided on the inner periphery of the cylindrical portion 22a of the tension wheel 22 in the radial direction of the tension wheel 22 on the inner side in the lateral direction of the vehicle body (Z1 side in the Z direction in FIG. 5). The second oil seal 68 is configured to seal between the inner peripheral portion of the first collar body 67 and the outer peripheral portion of the shaft portion 40 in the radial direction of the tension ring 22.

  The first collar body 67 is formed in a cylindrical shape, and is secured by bringing the first retaining body 69 into contact with the inner side in the lateral width direction of the vehicle body (Z1 side in the Z direction in FIG. 5). An O-ring 70 is provided between the outer periphery of the first collar body 67 and the inner periphery of the cylindrical portion 22 a of the tension ring 22 in the radial direction of the tension ring 22. The O-ring 70 seals between the outer periphery of the first collar body 67 and the inner periphery of the tension ring 22 in the radial direction of the tension ring 22, and the outer periphery of the first collar body 67 and the tension ring 22. By increasing the sliding resistance between the cylindrical portion 22a and the inner periphery of the tension portion 22 and the first collar body 67, the tension ring 22 and the first collar body 67 can be rotated together.

  The first oil seal 66 is fixed to the inner peripheral portion of the cylindrical portion 22 a of the tension ring 22, and the second oil seal 68 is fixed to the inner peripheral portion of the first collar body 67. As a result, the tension ring 22, the first oil seal 66, the first collar body 67, and the second oil seal 68 are integrally rotatable.

  In order to supply grease to the grease storage space 65, the shaft 40 is supplied from the grease supply unit 72 and the grease supply unit 72 to the outside in the vehicle body lateral width direction (Z2 side in the Z direction in FIG. 5). The grease introduction part 73 which guides the grease to the grease storage space 65 is provided. The grease supply unit 72 is configured by, for example, a grease nipple, and is disposed at the outer end portion (the end portion on the Z2 side in the Z direction in FIG. 5) of the shaft portion 40 in the lateral width direction of the vehicle body. The grease introduction portion 73 is configured by an insertion hole portion formed inside the shaft portion 40, and allows the grease supply space 72 and the grease storage space 65 to be inserted.

  A cover body 74 that covers the end portion of the cylindrical portion 22a and the end portions of the oil seals 66 and 68 in the tension ring 22 is provided on each of the inner side and the outer side in the vehicle body width direction. On the inner side in the vehicle body width direction (Z1 side in the Z direction in FIG. 5), the shaft portion 40, the second oil seal 68, the first collar body 67, and the tension wheel 22 are provided in this order from the radially inner side of the tension wheel 22. Therefore, the cover body 74 on the inner side in the vehicle body width direction (Z1 side in the Z direction in FIG. 5) is fixed to the inner portion of the shaft portion 40 in the vehicle width direction so as to cover the end portions of these members. ing. Since the shaft portion 40, the first oil seal 66, and the tension wheel 22 are provided in this order from the radially inner side of the tension wheel 22 on the outer side in the lateral direction of the vehicle body (Z2 side in the Z direction in FIG. 5). The cover body 74 on the outer side in the lateral width direction (Z2 side in the Z direction in FIG. 5) is fixed to the outer portion of the shaft portion 40 in the lateral direction of the vehicle body so as to cover the end portions of these members. The cover body 74 is formed in a circular shape when viewed from the side, and is provided in a state of contacting the inner wall surface of the third frame 37 in the vehicle body lateral width direction. In the radial direction of the tension wheel 22, the outer peripheral portion of the cover body 74 has a bent portion 75 that is bent away from the third frame 37 in the lateral direction of the vehicle body. The bent portion 75 and the cylindrical portion 22a of the tension ring 22 overlap in the lateral direction of the vehicle body, and the radially outer side of the tension wheel 22 in the cylindrical portion 22a is covered with the bent portion 75. This prevents foreign matter from entering the first oil seal 66 and the second oil seal 68 from between the cylindrical portion 22a of the tension ring 22 and the cover body 74.

  By adopting the grease seal configuration as described above, a sliding surface is provided between the inner peripheral portion of the first oil seal 66 and the second oil seal 68 and the outer peripheral portion of the shaft portion 40 in the radial direction of the tension ring 22. As a result, the tension wheel 22 is rotatably supported on the outer peripheral portion of the shaft portion 40. In the first oil seal 66 and the second oil seal 68, an elastic member such as rubber is disposed on the radially inner peripheral portion of the tension ring 22 serving as a sliding surface.

  Here, when the internal pressure of the grease in the grease storage space 65 rises, the first oil seal 66 and the second oil seal 68 try to move to the outside of the tension wheel 22 in the left-right direction (vehicle body width direction). Therefore, when the first oil seal 66 and the second oil seal 68 move in this manner, the first oil seal 66 and the second oil seal 68 may come into contact with the cover body 74. As a result, the first oil seal 66 and the second oil seal 68 that rotate relative to the shaft portion 40 slide and wear against the cover body 74 fixed to the shaft portion 40. Therefore, basically, when the internal pressure of the grease in the grease storage space 65 rises, excessive discharge of the internal pressure is prevented by allowing the discharge permitting member 71 to discharge the grease to the outside. In this embodiment, in addition to including the discharge permitting member 71, each of the first oil seal 66 and the second oil seal 68 has a second cylindrical shape that restricts the outward movement of the tension ring 22 in the left-right direction. A color body 76 is provided. The second collar body 76 is provided between the first oil seal 66 and the second oil seal 68 and the cover body 74 in the left-right direction (the vehicle body width direction) of the tension wheel 22. And when the 1st oil seal 66 and the 2nd oil seal 68 move a little outside in the left-right direction of the tension ring 22, the 2nd collar body 76 contacts the 1st oil seal 66 and the 2nd oil seal 68, Further movement of the tension wheel 22 in the left-right direction is restricted. Incidentally, even when the first oil seal 66 and the second oil seal 68 are not moved outward in the left-right direction of the tension ring 22, the second collar body 76, the first oil seal 66, and the second oil seal 68 are in contact with each other. It can also comprise so that it may contact | abut.

[Another embodiment]
(1) In the above embodiment, the cover body 74 prevents foreign matter from entering the first oil seal 66 and the second oil seal 68 side. However, as shown in FIG. 7, the cylindrical third collar By providing the body 77 and the fourth collar body 78, the gap between the pair of left and right third frames 37 and the first oil seal 66 and the second oil seal 68 is eliminated. 2 Foreign matter can be prevented from entering the oil seal 68 side.

  In this alternative embodiment, the shape of the cylindrical portion 22b provided at the central portion in the radial direction of the tension wheel 22 is different from the above-described embodiment, and in the left-right direction of the tension wheel 22 (the vehicle body lateral width direction, the Z direction in FIG. 7). The cylindrical portion 22 b of the tension ring 22 is configured to extend outward from the first oil seal 66 and the second oil seal 68. The third collar body 77 is provided in contact with the outer end portions of the first oil seal 66 and the second oil seal 68 in the left-right direction of the tension wheel 22. The third collar body 77 is disposed so as to fill a gap between the outer peripheral portion of the shaft portion 40 and the inner peripheral portion of the cylindrical portion 22 b in the tension ring 22 in the radial direction of the tension ring 22. Further, in this alternative embodiment, the first collar body 67 and the O-ring 70 are arranged outside the vehicle body width direction (Z2 side in the Z direction in FIG. 7), contrary to the above-described embodiment. As a result, on the inner side in the lateral direction of the vehicle body (Z1 side in the Z direction in FIG. 7), in the radial direction of the tension wheel 22, there is a gap between the inner periphery of the cylindrical portion 22b of the tension wheel 22 and the outer periphery of the shaft portion 40. Sealed by a second oil seal 68. On the outer side in the lateral direction of the vehicle body (Z2 side in the Z direction in FIG. 7), the first collar is disposed between the inner peripheral portion of the cylindrical portion 22b and the outer peripheral portion of the shaft portion 40 in the radial direction of the tension wheel 22. The body 67 is located, and the first oil seal 66 seals between the inner peripheral portion of the first collar body 67 and the outer peripheral portion of the shaft portion 40.

  On the inner side in the lateral direction of the vehicle body (Z1 side in the Z direction in FIG. 7), the third collar body 77 and the cylindrical portion 22b of the tension ring 22 are connected by the first pin 79, and the tension ring 22 and the third color body are connected. 77 is configured to rotate integrally. On the outer side in the vehicle body width direction (Z2 side in the Z direction in FIG. 7), the first color body 67 and the third color body 77 are connected by the first pin 79, and the first color body 67 and the third color body are connected. 77 is configured to rotate integrally. As described in the above embodiment, the provision of the O-ring 70 increases the sliding resistance between the outer peripheral portion of the first collar body 67 and the inner peripheral portion of the tension ring 22, and The one color body 67 is integrally rotatable. Therefore, by connecting the first color body 67 and the third color body 77, the tension ring 22, the first color body 67, and the third color body 77 are configured to rotate integrally.

  By providing the third collar body 77 having such a configuration, the outer sides of the first oil seal 66 and the second oil seal 68 can be covered in the left-right direction of the tension ring 22, and the outer end of the third collar body 77 can be covered. The outer end portion of the cylindrical portion 22b of the portion and the tension ring 22 is flush. The third collar body 77 covers the outside of the first oil seal 66 and the second oil seal 68, so that the tension wheel 22 moves outward in the left-right direction for each of the first oil seal 66 and the second oil seal 68. Can be regulated. Further, since the third collar body 77 rotates integrally with the first oil seal 66 and the second oil seal 68, the third collar body 77 is relatively moved between the first oil seal 66 and the second oil seal 68. Even if the rotation does not occur and the internal pressure of the grease in the grease storage space 65 increases, the first oil seal 66 and the second oil seal 68 do not wear.

  The fourth color body 78 is configured to be thinner than the third color body 77 and to have a smaller diameter in the radial direction than the third color body 77. The fourth color body 78 is disposed between the outer end surface of the third color body 77 and the inner wall surfaces of the pair of left and right third frames 37 in the left-right direction of the tension wheel 22 (the vehicle body width direction). Accordingly, it is possible to prevent foreign matter from entering between the outer end surface of the third collar body 77 and the inner wall surfaces of the pair of left and right third frames 37.

(2) In the above embodiment, the rod-shaped body 44 is supported so as to be rotatable and the cylindrical body 45 is provided on the support 29 so as not to be rotatable. However, as shown in FIG. The cylindrical body 45 can be provided on the support 29 so as to be freely rotatable. Thus, when the cylindrical body 45 is rotated, the cylindrical body 45 moves in the axial direction of the rod-shaped body 44. Therefore, the cylindrical body 45 and the support body 29 are integrally moved in the longitudinal direction of the vehicle body, and the position of the tension wheel 22 can be adjusted in the longitudinal direction of the vehicle body.

  Further, the rod-like body 44 can be fixed to the support 29 so as not to be rotatable, and the cylindrical body 45 can be supported on the track frame 20 so as to be rotatable. Furthermore, the cylindrical body 45 can be provided on the track frame 20 so as not to be rotated. In other words, the track frame 20 is used as a placement target member, and the cylindrical body 45 is fixed to the placement target member so as not to be rotatable.

(3) In the above-described embodiment, the cylindrical body 45 is prevented from rotating by restricting the rotation of the cylindrical body 45 by the first upright wall portion 38 and the pair of upper and lower first connecting wall portions 39. However, for example, the cylindrical body 45 can also be supported by rotating by fixing the cylindrical body 45 to the support body 29 by welding or the like.

(4) In the above embodiment, the rod-like body 44 is provided so as to extend across the track frame 20 and the support 29 in the longitudinal direction of the vehicle body, but the member provided on the track frame 20 side and the member provided on the support 29 side. These members can also be provided so as to extend across the track frame 20 and the support 29 in the longitudinal direction of the vehicle body. For example, as shown in FIG. 9, a cylindrical body 45 extending in the longitudinal direction of the vehicle body is rotatably provided on the track frame 20 side, and a rod-like body 44 extending in the longitudinal direction of the vehicle body is fixed on the support body 29 side. The cylindrical body 45 is longer than the rod-shaped body 44 in the longitudinal direction of the vehicle body. In FIG. 9, the length in the longitudinal direction of the vehicle body may be the same or substantially the same in the cylindrical body 45 and the rod-shaped body 44, or the rod-shaped body 44 may be longer than the cylindrical body 45. .

(5) In the above-described embodiment, an example in which the present invention is adapted to a normal combine as a work vehicle has been described. is there.

  The present invention includes a drive wheel that can be driven to rotate, a tension wheel that is disposed at an interval in the longitudinal direction of the drive wheel, and a crawler belt wound around the drive wheel and the tension wheel. A support body that rotatably supports the tension wheel, a track frame that supports the support body so as to be movable in the longitudinal direction of the vehicle body, and a tension adjustment mechanism that adjusts the position of the tension wheel in the longitudinal direction of the vehicle body relative to the track frame Even if the tension mechanism is exposed to the outside, the present invention can be applied to various crawler traveling devices that can easily adjust the tension of the crawler belt.

DESCRIPTION OF SYMBOLS 1 Crawler traveling apparatus 2 Airframe frame 20 Track frame 21 Drive wheel 22 Tension wheel 23 Crawler belt 29 Support body 38 1st standing wall part (rotation restriction part, extension wall part)
39 1st connection wall part (rotation control part, extension wall part)
43 Tension adjusting mechanism 44 Rod-like body 45 Cylindrical body 46 First screw part 47 Second screw part 51 Insertion part 57 Space 58 Screwing part 59 Grease supply part 60 Opening part 61 Guide groove part

Claims (10)

A drive wheel that can be driven and rotated, a tension wheel that is spaced from the drive wheel in the longitudinal direction of the vehicle body, a crawler belt wound around the drive wheel and the tension wheel, and the tension wheel. A support body that rotatably supports, a track frame that supports the support body so as to be movable in the longitudinal direction of the vehicle body, and a tension adjustment mechanism that adjusts the position of the tension wheel in the longitudinal direction of the vehicle body relative to the track frame. ,
The tension adjusting mechanism includes a first screw portion and a second screw portion dispersed on the track frame side and the support body side, and the track is formed by screwing the first screw portion and the second screw portion. The support body is configured to be movable in the longitudinal direction of the vehicle body with respect to the frame,
A crawler traveling device provided with a grease supply section capable of supplying grease to a threaded portion between the first screw section and the second screw section.   The first screw portion is formed on an outer peripheral portion of a rod-like body extending in the vehicle front-rear direction across the track frame and the support body, and the second screw portion is a tube that can be inserted through the rod-like body. The crawler traveling device according to claim 1, wherein the crawler traveling device is formed on an inner wall portion of the body.   The cylindrical body is disposed on the track frame or the support body, and the first screw portion is formed at an insertion portion through which the cylindrical body is inserted at least in the longitudinal direction of the vehicle body in the rod-shaped body. The crawler traveling device described in 1.   The crawler traveling device according to claim 2, wherein the cylindrical body is provided with a guide groove portion that guides and supplies the grease from the grease supply portion to the screwing portion.   The said guide groove part is extended in the radial direction inner side from the outer peripheral part of the said cylindrical body, and is comprised so that the outer peripheral part and the inner wall part in which the said 2nd screw part was formed may be penetrated. Crawler travel device.   The rod-shaped body is supported so as to be freely rotatable, and the cylindrical body is provided so as to be non-rotatable to the arrangement target member using the track frame or the support as an arrangement target member. The crawler traveling apparatus of Claim 1.   The crawler traveling device according to claim 6, wherein the arrangement target member includes a rotation restricting portion that abuts on an outer peripheral portion of the cylindrical body and restricts the rotation of the cylindrical body.   The rotation restricting portion is configured by an extending wall portion extending from the arrangement target member, and the cylindrical body is disposed in a space surrounded by the extending wall portion. The crawler traveling device described.   The extending wall portion is configured to surround the outer peripheral portion of the cylindrical body in a state where a part of the outer peripheral portion of the cylindrical body is opened outward, and the grease supply unit is configured to The crawler traveling device according to claim 8, wherein the crawler traveling device is disposed at a portion of the outer peripheral portion that is opened outward.   10. The cylindrical body according to any one of claims 2 to 9, wherein the cylindrical body is formed separately from the arrangement target member with the track frame or the support body as an arrangement target member, and is arranged on the arrangement target member. The crawler traveling device described in 1.

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