Crawler traveling device

Abstract

To facilitate work such as supplying / discharging grease to / from a rolling wheel in which a front support portion for supporting a front rolling wheel and a rear support portion for supporting a rear rolling wheel are connected by a rocking frame.SOLUTION: A rolling wheel support device 8 includes: a front support portion 8F rotatably supporting a front rolling wheel 7F; a rear support portion 8R rotatably supporting a rear rolling wheel 7R; and a rocking frame 80 connecting the front support portion 8F and the rear support portion 8R. A lateral first grease passage r1 through which grease can be injected from an outer side in a left-right direction of the front rolling wheel 7F is formed in the front support portion 8F. A lateral second grease passage r2 through which grease can be injected from an outer side in a left-right direction of the rear rolling wheel 7R is formed in the rear support portion 8R. Formed in the swing frame 80 are a third grease passage r3 extending from the lateral first grease passage r1 toward a rear side in a front-rear direction and a fourth grease passage r4 extending from the lateral second grease passage r2 toward a front side in a front-rear direction.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a crawler running device that has crawler belts arranged on the left and right sides of a running body, and a plurality of rollers inscribed on the inner surface of the crawler belt, and a swing frame that connects a front support part that supports the front rollers located on the front side and a rear support part that supports the rear rollers located on the rear side, the swing frame being supported so as to be swingable around a swing axis that runs along the left-right direction at a position midway between the front support part and the rear support part relative to a track frame. [Background technology]

[0002] In Patent Document 1, a grease supply structure is provided for supplying lubricating grease to each of a front support part that supports a front roller and a rear support part that supports a rear roller located on the rear side. This grease supply structure has a grease nipple provided at the front end of the front support portion, a grease passage running along the front-to-rear direction inside the oscillating frame, and an oil plug provided at the rear support portion to close the drain opening. With this type of crawler running device, the tasks of injecting grease through a grease nipple located at the front end of the front support part, and removing the oil plug blocking the opening in the rear support part to check whether grease overflows from the opening, must be carried out within the narrow space between the wheels lined up in the fore-and-aft direction, so tend to be difficult to perform efficiently. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-095186 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the prior art disclosed in the above-mentioned Patent Document 1, a grease nipple is provided at the front end of the front support, and an oil plug for closing the discharge opening is provided at the rear end of the rear support. The multiple rollers are arranged at relatively narrow, predetermined intervals between each other in the fore-and-aft direction so that the ground contact pressure of the crawler belt against the road surface is not concentrated only at the points where the rollers are located, but is distributed and approximated to an average state over the entire contact surface of the crawler belt. Therefore, when a specific location of a roller is used as a reference point among multiple rollers, the distance between the front roller of that specific location and the rear roller of a roller located further forward, and the distance between the rear roller of the roller at that specific location and the front roller of a roller located further back, tend to be quite narrow. This makes it quite cumbersome to insert a grease gun into the narrow gap between the front and rear wheels in the fore-and-aft direction to inject grease, and to remove and attach the oil plug that blocks the drain opening.

[0005] The present invention is intended to facilitate operations such as supplying and draining grease to rollers in which a front support section supporting a front roller and a rear support section supporting a rear roller are connected by a swing frame. [Means for solving the problem]

[0006] The crawler traveling device of the present invention is A crawler belt attached to the traveling body; A plurality of rollers inscribed on an inner peripheral surface of the crawler belt; A track frame extending in a state where the longitudinal direction is along the front-rear direction of the traveling machine body; A wheel support device that supports the wheel on the track frame is provided. The rollers include a front roller located at the front side in the front-to-rear direction and rotate around a rotation axis along the left-to-right direction, and a rear roller located at the rear side in the front-to-rear direction and rotate around a rotation axis along the left-to-right direction. the roller support device comprises a front support part that supports the front roller so as to be rotatable about the rotation axis, a rear support part that supports the rear roller so as to be rotatable about the rotation axis, and a swing frame that connects the front support part and the rear support part, The swing frame is supported by the truck frame so as to be swingable about a swing axis along a left-right direction at a midpoint between the front support portion and the rear support portion, a first lateral grease passage into which grease can be injected from an outer side in the left-right direction of the front roller in a direction along the rotation axis is formed in the front support portion; a second lateral grease passage into which grease can be injected from the outer side in the left-right direction of the rear roller in the direction along the rotation axis is formed in the rear support portion; The present invention is characterized in that a third grease passage extending from the first horizontal grease passage formed in the front support portion toward the rear side in the fore-and-aft direction, and a fourth grease passage extending from the second horizontal grease passage formed in the rear support portion toward the front side in the fore-and-aft direction, are formed within the oscillating frame.

[0007] According to the present invention, the first lateral grease passage and the second lateral grease passage into which grease can be injected are configured so that grease can be injected from the outer side in the left-right direction of the front roller or from the outer side in the left-right direction of the rear roller. This eliminates the need to insert a grease gun into the narrow space between the wheels in the front-to-rear direction to inject grease, or to remove and install an oil plug that blocks the drain opening. Therefore, grease can be injected from the outside in the left-to-right direction, and the work of injecting grease and the work of removing and installing an oil plug can be performed with good workability in a wide space on the outside in the left-to-right direction without being restricted by the presence of the front and rear wheels, which has the advantage of simplifying the work.

[0008] In addition, the grease injected from the outer side of the roller in the left-right direction is not only injected into the first lateral grease passage along the rotation axis of the front roller and the second lateral grease passage along the lateral rotation axis of the rear roller, but also into the third grease passage and fourth grease passage in the front-to-rear direction formed in the oscillating frame. Therefore, the internal space of the oscillating frame connecting the front support part and the rear support part, along with the first lateral grease passage and the second lateral grease passage, into which grease can be injected from the outside in the left-right direction of the roller, can be effectively utilized as space for storing grease, allowing a large amount of grease to be stored within the roller support device, which is also useful in that it makes it easier to reduce the frequency of maintenance.

[0009] In one preferred embodiment of the present invention, the third grease passage and the fourth grease passage are formed as a series of passages that communicate with each other.

[0010] According to this means, when injecting grease from the first lateral grease passage or the second lateral grease passage, there is no need to adjust the amount of grease stored in the third grease passage or the fourth grease passage while injecting, compared to when the third grease passage and the fourth grease passage are not connected, making it easier to perform the work quickly.

[0011] In one preferred embodiment of the present invention, the roller has an inner wheel located on the inside of the running body in the left-right direction along the rotation axis, and an outer wheel located on the outside of the running body.

[0012] According to this means, grease can be injected accurately even into the front support portion and the rear support portion, which are provided with an inner race and an outer race and which tend to have a long axial length.

[0013] In one preferred embodiment of the present invention, the width in the left-right direction of the outer race that is inscribed in the inner circumferential surface of the crawler belt is formed to be larger than the width in the left-right direction of the inner race.

[0014] According to this measure, the width of the outer ring in the left-right direction is formed larger than the width of the inner ring in the left-right direction, making it easy to ensure that the contact area of ​​the rollers in the left-right direction is as wide as possible.

[0015] In one preferred embodiment of the present invention, the wall thickness of the hub portion of the outer race is greater than the wall thickness of the hub portion of the inner race.

[0016] According to this method, by forming a first lateral grease passage and a second lateral grease passage in the hub portion of the outer ring, which has a greater wall thickness in the hub portion than the inner ring, it is easier to maintain the strength of the front support portion and the rear support portion higher than in the case where a first lateral grease passage and a second lateral grease passage are formed in the hub portion of the inner ring.

[0017] In one preferred embodiment of the present invention, an overflow portion is provided at a midpoint in the fore-and-aft direction of the oscillating frame to allow excess grease that has reached the third grease passage or the fourth grease passage to overflow.

[0018] According to this means, since the overflow part is provided at the middle part in the front-rear direction of the oscillating frame, it is possible to recognize by watching the grease overflowing from the overflow part that the third grease passage or the fourth grease passage has been filled to capacity with grease injected from the outer side in the left-right direction. Therefore, compared to a conventional structure in which the grease overflow is confirmed by looking from behind into an opening with the oil plug removed at the rear side of the rear support part while injecting grease into a grease nipple at the front side of the front support part of the roller, the overflow of grease from the overflow part can be easily and quickly visually confirmed.

[0019] In one preferred embodiment of the present invention, the overflow portion is provided at a location close to the oscillation axis in the front-rear direction.

[0020] According to this means, the overflow portion is located at a position close to the oscillating axis of the oscillating frame in the fore-and-aft direction, so that when viewed from the outside of the running body in the left-right direction, there is no risk of the location of the overflow portion being obstructed by the presence of the wheels, making it even easier to see.

[0021] In one preferred embodiment of the present invention, the overflow portion is a breather capable of discharging air that has been present in the third grease passage or the fourth grease passage.

[0022] This means makes it easy to discharge air from the grease as a breather, and also makes it possible to visually check the overflowing state of excess grease.

[0023] In one preferred embodiment of the present invention, the breather has an exhaust port provided in an upper surface portion at a middle portion in the front-rear direction of the oscillating frame.

[0024] According to this means, the overflow portion is provided on the upper surface portion at a midpoint in the fore-aft direction of the oscillating frame, making it easier to see from the outside of the traveling body in the left-right direction. [Brief description of the drawings]

[0025] [Figure 1] Side view of the entire combine harvester [Diagram 2] Side view of the left crawler travel unit [Diagram 3] A longitudinal rear view in the left-right direction at the pivot point of the rollers on the left crawler running device [Figure 4] A longitudinal cross-sectional side view in the front-rear direction at a location along the swing frame of the rollers provided on the left crawler running device [Diagram 5] Cross-sectional plan view of the wheels of the left crawler running device DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a crawler traveling device according to the present invention will be described with reference to the drawings. In addition, unless otherwise specified, the front-rear direction and the left-right direction in the description of this embodiment are described as follows. In other words, the forward traveling direction (see arrow F in FIG. 1) when a head-feeding combine harvester to which the crawler traveling device of the present invention is applied is traveling is "forward", the backward traveling direction (see arrow B in FIG. 1) is "rear", the direction corresponding to the right side based on the forward posture in the front-rear direction (see arrow R in FIG. 2) is "right", and similarly the direction corresponding to the left side (see arrow L in FIG. 2) is "left". Also, the arrow U in the figures indicates the "up" direction, and the arrow D indicates the "down" direction.

[0027] [Overall configuration of the combine] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a vehicle frame 2 supported by a pair of left and right crawler traveling devices 1, 1. A driver's cabin-type driving section 3 and a prime mover (not shown) are disposed on the vehicle frame 2 to form a self-propelled vehicle. The driver's section 3 includes a control section (not shown) inside the driver's cabin 3A, and a driver's seat 3B. The prime mover is provided below the driver's seat 3B. The base end side of the pre-harvesting treatment section frame 4A of the pre-harvesting treatment section 4 is connected to the front of the body frame 2 so as to be freely rotatable about a lateral axis of the machine. A threshing device 5 that threshes the harvested crops and a grain tank 6 are mounted on the body frame 2 behind the pre-harvesting treatment section 4, and the machine is used as a head-feeding combine.

[0028] This head-feeding combine harvester is used to harvest grains such as rice and wheat. The pre-harvesting treatment section 4 is configured to be raised and lowered between a working position lowered close to the ground surface and a raised non-working position raised high above the ground surface by the extension and retraction of a hydraulic lift cylinder 10 connected to the pre-harvesting treatment section frame 4A. By moving the self-propelled machine with the pre-harvesting processing section 4 in the lowered working position, the pre-harvesting processing section 4 raises and processes each of the planted stalks of the multiple planting rows to be harvested using the raising device 4B, and then harvests them using the clipper-type harvesting device 4C. The harvested stalks are transported to the rear of the machine by the transport device 11, which consists of a clamping transport device acting on the base side and a locking transport device acting on the ear side. The harvested stalks from the transport device 11 are transported toward the rear of the machine by the threshing feed chain 12, while the ear side is supplied to a threshing chamber (not shown) for threshing, and the threshed grains from the threshing device 5 are collected and stored in the grain tank 6.

[0029] [Crawler Traveling Device] The crawler traveling device 1 arranged on the left side of the self-propelled vehicle and the crawler traveling device 1 arranged on the right side are configured symmetrically. In this embodiment, for convenience, the description of the right crawler traveling device 1 is omitted, and the left crawler traveling device 1 is described with reference to the drawings. As shown in FIGS. 1 and 2, a transmission case 20 is fixed to the front end of the vehicle frame 2, and a drive shaft 20a protruding from the transmission case 20 on both the left and right sides is provided with a drive sprocket 21.

[0030] Below the vehicle frame 2, a track frame 15 is provided on the left side via a pair of front and rear swing links 13, 14 so that its vertical position can be changed. The track frame 15 extends in the longitudinal direction of the vehicle. This track frame 15 is provided with a plurality of ground contact rollers 7 that are supported in a line in the longitudinal direction of the track frame 15 and are free to rotate. A tensioning idler wheel 16 is provided at the rear end of the track frame 15 via a tension adjustment bolt 16a. Furthermore, an upper idler wheel 22 is provided at a position higher than the track frame 15 on a bracket 2a attached to the middle part of the machine frame 2 in the fore-aft direction, supporting the inner circumferential surface of a crawler belt 23 (described later) from below. A rubber crawler belt 23 is wound around these drive sprockets 21, each roller 7, the tensioning idler wheel 16, and the upper idler wheel 22.

[0031] 2, of the front and rear swing links 13, 14, a piston rod of a double-acting hydraulic lift cylinder 18 is connected to the upper end of the bell crank-shaped swing link 13 located on the front side. Similarly, a piston rod of a double-acting hydraulic lift cylinder 17 is connected to the upper end of the bell crank-shaped swing link 14 located on the rear side. In this structure, when the hydraulic lift cylinders 17, 18 are operated to extend and retract, the front and rear swing links 13, 14 are operated to swing relative to the machine frame 2 around the horizontal axes P1, P2 in the left-right direction provided on the machine frame 2. As a result, the track frame 15 is arranged to move up and down relative to the machine frame 2.

[0032] [Roller wheel] As shown in FIGS. 2 to 5, the ground contact roller 7 is supported on a track frame 15 via a roller support device 8. The roller 7 includes a front roller 7F located at the front side in the fore-and-aft direction and rotating around a rotation axis P3 along the left-right direction, and a rear roller 7R located at the rear side in the fore-and-aft direction and rotating around a rotation axis P4 along the left-right direction. Each of the front roller 7F and the rear roller 7R has an inner roller 71 located on the inner side of the self-propelled body and an outer roller 72 located on the outer side of the self-propelled body in the left-right direction along the rotation axes P3 and P4. The inner ring 71 and the outer ring 72 use a stepped shaft 70 with a large diameter at the center in the longitudinal direction as a rotational support shaft that supports the inner ring 71 and the outer ring 72, and are connected so that they rotate together on the left and right sides via this stepped shaft 70. The axis of this stepped shaft 70 becomes the rotation axis P3 and the rotation axis P4. The stepped support shaft 70 is one of the components of the roller 7 in that it connects the inner wheel 71 and the outer wheel 72 so that they rotate together, but as it supports the inner wheel 71 and the outer wheel 72 so that they can rotate freely, it also serves as part of the roller support device 8.

[0033] The roller support device 8 comprises a front support part 8F that pivots freely around the stepped support shaft 70 of the front roller 7F, a rear support part 8R that pivots freely around the stepped support shaft 70 of the rear roller 7R, and a swaying frame 80 that connects the front support part 8F and the rear support part 8R. The front support portion 8F and the rear support portion 8R are configured to have the same shape, and FIG. 3 shows a vertical cross section of the front support portion 8F in a direction along the rotation axis P3, with the rear support portion 8R not shown. This front support portion 8F is equipped with a ball bearing 82 that holds the stepped support shaft 70 so that it can rotate freely, and a cylindrical boss member 81 that supports the inner race 71 and the outer race 72 via the stepped support shaft 70 in a state where it is fitted onto the ball bearing 82. Similarly, the rear support part 8R is equipped with a ball bearing 82 that holds the stepped support shaft 70 so that it can rotate freely, and a cylindrical boss member 81 that supports the inner wheel body 71 and the outer wheel body 72 via the stepped support shaft 70 in a state where it is fitted onto the outside of the ball bearing 82.

[0034] The front support portion 8F having the boss member 81 and the rear support portion 8R having the boss member 81 are integrally connected by a swing frame 80, as shown in FIGS. In addition, a sled-shaped guide 83 for preventing wheels from coming off is integrally provided across the front support portion 8F and the rear support portion 8R and is located below the oscillating frame 80. The boss members 81, 81 provided on the front support portion 8F and the rear support portion 8R, the oscillating frame 80, and the sled-shaped guide 83 are integrally cast.

[0035] The swing frame 80 is provided with a boss portion 84 having a cylindrical axis extending in the left-right direction at a midpoint between the front support portion 8F and the rear support portion 8R in the front-rear direction. This boss portion 84 is configured to be fitted onto the left-right swing fulcrum shaft 19 fixed to the track frame 15. Therefore, by fitting the boss portion 84 onto the swing fulcrum shaft 19, the swing frame 80 is supported so as to be swingable up and down like a balance, with the axis of the swing fulcrum shaft 19 fixed to the track frame 15 serving as a swing axis P5.

[0036] 3 and 5, the inner roller 71 and the outer roller 72 constituting the front roller 7F and the rear roller 7R, respectively, are formed such that the width w2 in the left-right direction of the outer roller 72 inscribed in the inner peripheral surface of the crawler belt 23 is larger than the width w1 in the left-right direction of the inner roller 71. Also, the outer roller 72 is formed such that the thickness t2 of the hub portion 72a is larger than the thickness t1 of the hub portion 71a of the inner roller 71.

[0037] [Lubrication path] Lubrication of the ground contact roller 7 is carried out as follows. As shown in FIGS. 3 to 5, inside the roller 7, a lubrication passage Gr is formed for injecting grease.

[0038] The lubrication path Gr is provided with a first lateral grease passage r1, into which grease can be injected from the outer end of the stepped support shaft 70 which also serves as part of the front support portion 8F, on the outer side of the front roller 7F in the left-right direction, a second lateral grease passage r2, into which grease can be injected from the outer end of the stepped support shaft 70 which also serves as part of the rear support portion 8R, on the outer side of the rear roller 7R in the left-right direction, a third grease passage r3 extending from the first lateral grease passage r1 to the rear side in the front-to-rear direction, and a fourth grease passage r4 extending from the second lateral grease passage r2 to the front side in the front-to-rear direction. Furthermore, at the front support portion 8F, a front grease reservoir s1 is formed between the left and right ball bearings 82 that support the stepped support shaft 70, and at the rear support portion 8R, a rear grease reservoir s2 is formed between the left and right ball bearings 82 that support the stepped support shaft 70, and an intermediate grease reservoir s3 is formed between the outer peripheral surface of the oscillating fulcrum shaft 19 and the inner peripheral surface of the boss portion 84 at a midpoint in the fore-and-aft direction of the oscillating frame 80.

[0039] The first lateral grease passage r1 and the second lateral grease passage r2 are formed along the rotation axes P3, P4 of the stepped support shaft 70 in a range extending from the outer end of the stepped support shaft 70 to a location corresponding to the middle portion in the left-right direction of the front grease reservoir s1 and the rear grease reservoir s2. The first lateral grease passage r1 and the second lateral grease passage r2 are formed in the axial center of the stepped support shaft 70 so that the rotation axes P3, P4 are included in the first lateral grease passage r1 and the second lateral grease passage r2 when viewed in the direction along the rotation axes P3, P4, but are not necessarily limited to the axial center and may be formed at a slightly eccentric position deviated from the rotation axes P3, P4.

[0040] As shown in Fig. 5, a grease nipple 73 is attached to the outer ends of the first lateral grease passage r1 and the second lateral grease passage r2, i.e., the outer end of the stepped support shaft 70. This grease nipple 73 is provided in a state where it is located at a lateral outer location of the outer wheel 72 facing laterally outward in the left-right direction in the crawler traveling device 1 when it is attached to the machine body frame 2. A cap 74 is provided on the outer end of the stepped support shaft 70 from which the grease nipple 73 protrudes, so as to cover the grease nipple 73 from the outside. This cap 74 is detachable from the stepped support shaft 70, and is made of a metal or resin member. Therefore, by removing the cap 74, it is possible to inject grease into the first lateral grease passage r1 and the second lateral grease passage r2 from the lateral outer portion of the roller 7 where the grease nipple 73 is located. The cap 74 does not necessarily have to be provided.

[0041] Grease injected from the grease nipple 73 into the first horizontal grease passage r1 and the second horizontal grease passage r2 is supplied to the front grease reservoir s1 and the rear grease reservoir s2 via a connecting passage r5 extending from the inner ends of the first horizontal grease passage r1 and the second horizontal grease passage r2 radially outward of the stepped support shaft 70. The grease supplied to the front grease reservoir s1 and the rear grease reservoir s2 is supplied accurately to the left and right ball bearings 82, 82 which support the stepped support shaft 70 so as to be able to rotate freely.

[0042] When the amount of grease supplied to the front grease reservoir s1 and the rear grease reservoir s2 exceeds the capacity of the front grease reservoir s1 and the rear grease reservoir s2, the grease exceeding the capacity is supplied to the intermediate grease reservoir s3 via the third grease passage r3 and the fourth grease passage r4. Of the outer peripheral surface of the oscillating fulcrum shaft 19 and the inner peripheral surface of the boss portion 84 that constitute the intermediate grease reservoir s3, a breather 85 is provided above the boss portion 84 as an overflow portion that allows excess grease to overflow to the outside. The location where this breather 85 is provided is a location close to the oscillating axis P5 in the front-rear direction, such as directly above the oscillating axis P5, which is the axis of the oscillating fulcrum shaft 19 that serves as the oscillating fulcrum of the oscillating frame 80. In this way, by providing the breather 85 at a location close to the oscillating axis P5, the overflow of excess grease to the outside can be easily detected without visual obstruction due to the presence of many rollers 7.

[0043] [Another embodiment] Other embodiments will be described below. The following embodiments may be combined with the above embodiment as long as no contradiction occurs. The scope of the present invention is not limited to the contents of these embodiments.

[0044] (1) In the above-described embodiment, an example was given of a structure in which each of the front roller 7F and the rear roller 7R of the roller 7 is constructed by combining an inner roller 71 and an outer roller 72, but the present invention is not necessarily limited to such a structure. For example, the inner race 71 and the outer race 72 may be integrally formed. The other configurations may be the same as those of the above-described embodiment.

[0045] (2) In the above-described embodiment, a structure in which the width w2 in the left-right direction of the outer ring 72 is larger than the width w1 in the left-right direction of the inner ring 71 is exemplified, but the present invention is not necessarily limited to such a structure. For example, the structure may be such that the width w1 in the left-right direction of the inner ring 71 is larger than the width w2 in the left-right direction of the outer ring 72, or the width w1 in the left-right direction of the inner ring 71 and the width w2 in the left-right direction of the outer ring 72 may be formed to be equal. The other configurations may be the same as those of the above-described embodiment.

[0046] (3) In the above-described embodiment, a structure in which the thickness t2 of the hub portion 72a of the outer ring 72 is greater than the thickness t1 of the hub portion 71a of the inner ring 71 is exemplified, but the present invention is not necessarily limited to such a structure. For example, the structure may be such that the thickness t1 of the hub portion 71a of the inner ring 71 is greater than the thickness t2 of the hub portion 72a of the outer ring 72, or the thickness t1 of the hub portion 71a of the inner ring 71 and the thickness t2 of the hub portion 72a of the outer ring 72 may be equal to each other. The other configurations may be the same as those of the above-described embodiment.

[0047] (4) In the above-described embodiment, a structure was exemplified in which a ball bearing 82 is interposed between the stepped support shaft 70 serving as a rotating support shaft supporting the inner ring 71 and the outer ring 72 and a boss member 81 to form a large-volume space for grease storage. However, the present invention is not limited to this structure, and for example, a bushing may be used to support the rotating support shaft, thereby forming a small-volume space for grease storage. The other configurations may be the same as those of the above-described embodiment.

[0048] (5) In the above-described embodiment, the third grease passage r3 and the fourth grease passage r4 are formed as a series of passages that communicate with each other, but the present invention is not necessarily limited to this structure. For example, the third grease passage r3 may extend from the horizontal first grease passage r1 toward the rear side in the fore-and-aft direction, with one breather 85 provided at its end as an overflow portion, and the fourth grease passage r4 may extend from the horizontal second grease passage r2 toward the front side in the fore-and-aft direction, with another breather 85 provided at its end as another overflow portion. The other configurations may be the same as those of the above-described embodiment.

[0049] (6) In the above-described embodiment, a breather 85 is used as an overflow portion, but this structure is not necessarily limited to this, and any structure can be used as long as it is capable of discharging excess grease when the internal pressure reaches a predetermined level. The other configurations may be the same as those of the above-described embodiment.

[0050] (7) In the above-described embodiment, an example was given of a structure in which the breather 85 as an overflow section is provided directly above the oscillating axis P5, which is the axis of the oscillating fulcrum shaft 19, which serves as the oscillating fulcrum of the oscillating frame 80; however, the present invention is not necessarily limited to this structure. For example, it is desirable to have the location close to the oscillating axis P5 in the fore-and-aft direction and on the upper surface side of the oscillating frame 80, but any location corresponding to between the front roller 7F and the rear roller 7R in the longitudinal direction of the oscillating frame 80 may be selected. The other configurations may be the same as those of the above-described embodiment. [Industrial Applicability]

[0051] The present invention has exemplified a crawler traveling device applied to a head-feeding combine as an example of a crawler traveling device, but is not limited to this and can be applied to crawler traveling devices that can be used in normal combines, various harvesters such as corn harvesters, or tractors, construction machines, and transport vehicles. [Explanation of symbols]

[0052] 7. Wheels 7F Front wheel 7R Rear wheel 8 Roller support device 8F front support section 8R rear support part 15 Truck Frame 23 Crawler Belt 71 Medial limbus 71a Hub part t1 wall thickness 72 Lateral orbicularis 72a Hub section t2 wall thickness 80 Swing Frame 85 Breather P3 Rotation axis P4 Rotation axis center P5 Swing axis center r1 First horizontal grease passage r2 Second horizontal grease passage r3 Third grease passage r4 Fourth grease passage

Claims

1. A crawler belt attached to the traveling body; A plurality of rollers inscribed on an inner peripheral surface of the crawler belt; A track frame extending in a state where the longitudinal direction is along the front-rear direction of the traveling machine body; A wheel support device that supports the wheel on the track frame is provided. The rollers include a front roller located at the front side in the front-to-rear direction and rotate around a rotation axis along the left-to-right direction, and a rear roller located at the rear side in the front-to-rear direction and rotate around a rotation axis along the left-to-right direction. the roller support device comprises a front support part that supports the front roller so as to be rotatable about the rotation axis, a rear support part that supports the rear roller so as to be rotatable about the rotation axis, and a swing frame that connects the front support part and the rear support part, The swing frame is supported by the truck frame so as to be swingable about a swing axis along a left-right direction at a midpoint between the front support portion and the rear support portion, a first lateral grease passage into which grease can be injected from an outer side in the left-right direction of the front roller in a direction along the rotation axis is formed in the front support portion; a second lateral grease passage into which grease can be injected from the outer side in the left-right direction of the rear roller in the direction along the rotation axis is formed in the rear support portion; A crawler running device in which a third grease passage extending from the first lateral grease passage formed in the front support portion to the rear side in the fore-and-aft direction, and a fourth grease passage extending from the second lateral grease passage formed in the rear support portion to the front side in the fore-and-aft direction, are formed within the oscillating frame.

2. 2. The crawler travel device according to claim 1, wherein the third grease passage and the fourth grease passage are formed as a series of passages that communicate with each other.

3. The crawler running device of claim 1, wherein the rollers include an inner wheel located on the inner side of the running body in the left-right direction along the rotation axis, and an outer wheel located on the outer side of the running body.

4. 4. The crawler travel device according to claim 3, wherein the width in the left-right direction of the outer race that is inscribed in the inner peripheral surface of the crawler belt is formed to be larger than the width in the left-right direction of the inner race.

5. 5. The crawler travel device according to claim 4, wherein a wall thickness of the hub portion of the outer race is greater than a wall thickness of the hub portion of the inner race.

6. A crawler traveling device as described in any one of claims 1 to 5, wherein an overflow portion is provided at a midpoint in the fore-and-aft direction of the oscillating frame to allow excess grease that has reached the third grease passage or the fourth grease passage to overflow.

7. 7. The crawler travelling device according to claim 6, wherein the overflow portion is provided at a location close to the pivot axis in the front-rear direction.

8. 7. The crawler travel device according to claim 6, wherein the overflow portion is a breather capable of discharging air that has been present in the third grease passage or the fourth grease passage.

9. 9. The crawler traveling device according to claim 8, wherein the breather has an outlet provided in an upper surface portion at a midpoint in the front-rear direction of the oscillating frame.

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