JP3431588B2 - Crawler traveling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler traveling device provided in an agricultural work vehicle, a work vehicle for civil engineering or construction, and the like.

[0002]

2. Description of the Related Art A conventional crawler traveling device is provided with a plurality of grounding wheels for guiding the ground side of a crawler belt and a bearing boss portion for rotatably supporting each grounding roller. In order to inject lubricating oil into the inside of each bearing, a lubricating oil injection passage communicating with the inside of the bearing boss is provided for each bearing boss, and lubricating is performed through the lubricating oil injection passage for each bearing boss. I try to inject oil.

[0003]

Therefore, since lubricating oil must be injected into each bearing boss, maintenance is troublesome.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to reduce the time and effort required for maintenance of a ground roller.

[0005]

According to a first aspect of the present invention, there is provided a fulcrum boss portion rotatably fitted on a fulcrum shaft provided on a track frame, and a ground for guiding a ground side of a crawler belt. By providing a rolling wheel bracket having a plurality of boss portions for bearings that rotatably support the rolling wheels, the grounding rolling wheels that are adjacent in the running direction are supported so that they can swing freely around the fulcrum axis, and A lubricating oil injection passage communicating with the inside of the boss portion is communicated with the inside of the bearing boss portion.

[Operation] A fulcrum boss that is rotatably fitted on a fulcrum shaft provided on a track frame, and a plurality of bearing bosses that rotatably support a ground roller that guides the ground side of the crawler belt. By providing a wheel bracket with
Since the grounding wheels adjacent to each other in the traveling direction are swingably supported around the fulcrum shaft, when the grounding wheels supported on one side sandwiching the fulcrum shaft swing upward, the grounding wheels supported on the other side are moved. It is possible to reduce the vertical movement of the entire crawler traveling device associated with the vertical movement of the grounding wheels while increasing the relative vertical movement of the grounding rollers while swinging downward.

Further, since the lubricating oil injection passage communicating with the inside of the fulcrum boss portion is communicated with the inside of the bearing boss portion, the lubricating oil is injected from the lubricating oil injection passage into the inside of the fulcrum boss portion. At this time, the lubricating oil can be injected into the inside of the bearing boss portion through the lubricating oil injection passage.

[Effect] The vertical movement of the entire crawler traveling device is increased while increasing the relative vertical movement of the grounding wheels adjacent to each other in the traveling direction so that each grounding roller can smoothly follow the unevenness of the traveling surface. It is possible to make the vehicle run stably with less oil and to inject lubricating oil into the bearing boss when injecting lubricating oil into the fulcrum boss. You can reduce the effort.

According to a second aspect of the present invention, the rolling wheel bracket is integrally formed by casting, and a communication passage that connects the inner side of the fulcrum boss portion and the inner side of the bearing boss portion is provided with the rolling wheel. While cutting from one end side of the bracket, a plug for closing the one end side opening of the communication passage is provided,
The lubricating oil injection passage is communicated with the inside of the bearing boss portion.

[Operation] The rolling wheel bracket is integrally formed by casting, and a communication passage that connects the inside of the fulcrum boss portion and the inside of the bearing boss portion is formed by cutting from one end side of the rolling wheel bracket, and the communication passage is formed. Since a plug that closes the opening on one end side is provided to connect the lubricating oil injection path to the inside of the bearing boss, a pipe for lubricating oil injection that connects the lubricating oil injection path and the inside of the bearing boss No members are needed.

[Effect] The structure of the crawler traveling device can be simplified.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. [Overall Configuration] FIG. 1 shows a combine (an example of an agricultural work vehicle) as an example of a crawler traveling type work vehicle, which causes planted grain culms such as rice and wheat to be treated and cut, and a mowed grain culm that has been mowed is placed behind the machine body. And a boarding type operation unit 2, a threshing device 3 for threshing the cut grain culms from the mowing unit 1, and a grain tank 4 for storing grains threshed by the threshing device 3, A traveling machine body A including an engine E located below the driver's seat 5 is provided.
And a pair of right and left crawler traveling devices B are connected via an elevating drive mechanism C, and the traveling machine body A is provided so as to be capable of being driven up and down relative to the crawler traveling device B.

[Crawler Traveling Device] As shown in FIGS. 2 to 5, each of the crawler traveling devices B includes a track frame 7 that is connected to a machine body frame 6 through a lifting drive mechanism C so as to be driven up and down, and a track. A tension free wheel 8 supported at the rear end of the frame 7 in the longitudinal direction of the machine body, and a crawler belt 1.
Six grounding wheels 9 for guiding the grounding side of the vehicle body 2, a driving wheel 10 supported on the front side of the machine body frame 6, and an upper guide wheel 1 supported on an intermediate position of the machine body frame 6 in the machine longitudinal direction.
1 is provided, and a rubber crawler belt 12 is wound around the drive wheel 10, the grounding wheel 9, the idle wheel 8 for tensioning, and the upper guide wheel 11.

The track frame 7 has a square pipe-shaped main frame portion 14 and a square pipe-shaped auxiliary frame portion 15 fixed to the lower surface side of the main frame portion 14.
And a rectangular pipe-shaped extension frame portion 16 fitted in the rear end side of the main frame portion 14 in an inscribed state so as to be able to move forward and backward in the machine body. An idle wheel 8 for tensioning is supported at the end.

The tension free wheel 8 is supported by the extension frame portion 16 and is connected to the rear end portion of the main frame portion 14 by a position adjusting mechanism 17 using a screw mechanism, so that the track frame 7 is connected. It is provided to adjust the position of the vehicle in the front-back direction and to fix the position.

The driving wheel 10 is provided so that power is transmitted from a transmission case fixed to the machine body frame 6 and engages with the crawler belt 12 to transmit the driving force. The upper guide wheel 11 is a crawler. The belt 12 is supported by the machine body frame 6 so as to rotate freely by contact with the inner peripheral surface on the upper side of the belt 12.

Then, due to the vertical movement of the track frame 7 relative to the machine body frame 6 in the vertical direction and the change in the posture of forward and backward inclination, the required winding length of the crawler belt 12 slightly changes. The arrangement position on the machine body frame 6 is set so that the slack can be regulated by the upper guide wheel 11.

As shown in FIGS. 6 to 11, the grounding roller 9 has a rotary wheel 21 fixed to both ends of a rotary shaft 20, and each rotary wheel 21 has left and right core metal projections of a crawler belt 12. Two
It is provided so as to contact the inner peripheral surface of the crawler belt 12 at both left and right sides of 2, and is divided into three sets consisting of a combination of two grounding wheels 9 which are adjacent to each other in the machine longitudinal direction (travel direction). , Three caster wheel brackets 19 made of casting, which are swingable around the three fulcrum shafts 18 fixed to the auxiliary frame portion 15, are provided, and two grounding roller wheels 9 of each set are provided.
Is rotatably supported on each of the wheel brackets 19 so that the balance can swing around the fulcrum shaft 18.

The rolling wheel bracket 19 has a fulcrum boss portion 23 rotatably fitted on the fulcrum shaft 18, and two bearing boss portions 24 rotatably supporting the rotary shaft 20 of the grounding roller 9. And a sled-shaped guide 25 for preventing derailment having a T-shaped cross section are integrally cast, and in a side view, each grounding roller 9 of each grounding roller 9 is on a straight line passing through the fulcrum axis X of the fulcrum shaft 18. A fulcrum boss portion 23 and two bearing boss portions 24 are provided so that each ground roller 9 is supported in a symmetrical position with the fulcrum shaft 18 in between when the rotation axis Y is located. .

In other words, by positioning the fulcrum axis X at the center of the line segment connecting the rotation axis Y of the front and rear grounding wheels 9, the relative vertical movement of each grounding roller 9 is increased, and each grounding is performed. While allowing the rolling wheels 9 to smoothly follow the irregularities of the traveling surface, the vertical movement of the traveling machine body A is reduced to allow the vehicle to travel stably with good riding comfort. Further, by integrally casting the sled guide 25 on the wheel bracket 19, the wheel bracket 19 is reinforced and the mounting structure of the sled guide 25 can be simplified.

Further, a fulcrum shaft 18 (18a) for swingably supporting the set of the grounding roller 9 of the three grounding rollers 9 which is provided at an intermediate position in the longitudinal direction of the machine body on the road described later. It is provided so as to be located near the vertical line Z passing through the position of the center of gravity of the traveling body A when traveling (see FIG. 2) so that the riding comfort during turning traveling can be improved.

The sled guide 25 is used for the crawler belt 1.
It is located between the left and right core metal protrusions 22 of the second guide 2, and exerts a function of preventing the crawler belt 12 from moving in the left-right direction. Intermediate portion 2 located between the front and rear grounding wheels 9
The lower surface side of 6 is made higher than the height of the lower surface of the front and rear portions thereof so that the crawler belt 12 can be allowed to enter the machine body side due to traveling of the uneven surface.

In order to inject grease as lubricating oil into the gap between the fulcrum boss portion 23 and the fulcrum shaft 18, as shown in FIG. Grease injection path 27 as a communicating lubricating oil injection path
And a grease nipple 28 are provided.

Further, the grease injected from the grease nipple 28 can be injected into the grease injection space 29 between the rotary shaft 20 of each bearing boss 24 through the gap between the fulcrum boss 23 and the fulcrum shaft 18. So that the boss 23 for the fulcrum
And an arm portion 30 for connecting the bearing boss portion 24 with each other.
In addition, the communication passage 31 that communicates the inside of the fulcrum boss portion 23 and the inside of each bearing boss portion 24 is cut and formed from one end side of the roller bracket 19, and one end of the communication passage 31 that is a cutting start point is formed. A plug 32 for closing the side opening is provided so that the grease injection passage 27 communicates with the inside of each bearing boss portion 24.

[Lifting Drive Mechanism] The lifting drive mechanism C is
As shown in FIGS. 2 to 5, the body frame 6 and the track frame 7 are separately connected by a pair of front and rear swing links 13, and each swing link 13 is connected to a hydraulic cylinder 33 as a fluid pressure cylinder. It is configured such that the traveling machine body A is driven and lifted up and down with respect to the crawler traveling device B by drivingly swinging each by expansion and contraction operation.

The pair of front and rear swing links 13 is composed of a front swing link 34 provided on the front side of the machine body and a rear swing link 35 provided on the rear side of the machine body. A front hydraulic cylinder 36 for driving and rocking the rear rocking link 35 and a rear hydraulic cylinder 37 for driving and rocking the rear rocking link 35 are provided on the machine body frame 6 side, and the rocking links 34, 35 are driven and rocked separately. I am able to do it.

As shown in FIG. 10, the front swing link 34 is provided with a bell crank-shaped link member 38 whose pivot point is pivotally supported on the machine body frame 6 about the horizontal axis in the vicinity of its bending point. A first extending arm portion 39, which is provided and extends in one direction from the pivot point, is connected to the front hydraulic cylinder 36, and a second extending arm portion 40 extending in the other direction is provided on the upper portion of the track frame 7. It is swingably and pivotally connected to the fixed front support shaft 41.

As shown in FIG. 11, the rear swing link 35 has a bell crank-shaped first arm 42 which is pivotally supported by the body frame 6 about the horizontal axis in the vicinity of its bending point. , A second arm 43 pivotally connected to the track frame 7 so as to be swingably connected,
A first extension arm portion 44 extending in one direction from the pivotal support portion of the first arm 42 is connected to the rear hydraulic cylinder 37, and a second extension arm portion 45 extending in the other direction is secondly provided via a rear support shaft 46. It is pivotally connected to the arm 43 so as to be swingable.

The second arm 43 is swingably and pivotally connected to a support shaft 47 which is integrally formed with a fulcrum shaft 18 which supports the rear wheel body wheel bracket 19 (19a) on the track frame 7. It is formed in a curved shape in a side view so as not to interfere with the grounding wheel 6 when swinging.

Then, as shown in FIG. 2, the front hydraulic cylinder 36 is in the most extended state, and the rear hydraulic cylinder 37 is
By holding the vehicle in the most contracted state, the entire traveling machine body A is lowered to the maximum with respect to the crawler traveling device B, the ground height of the machine body frame 6 is the lowest, and the machine body frame 6 is substantially in relation to the traveling surface. By holding the parallel lowest descent posture and the front hydraulic cylinder 36 in the most contracted state and the rear hydraulic cylinder 37 in the most extended state as shown in FIG. 3,
The traveling machine body A as a whole rises with respect to the crawler traveling device B, the ground plane height of the machine body frame 6 is the highest, and the machine body frame 6 is in a maximum ascending posture substantially parallel to the traveling surface. The attitude of the traveling machine body A is provided so as to be freely changeable, and the lowest descending attitude is set as a road traveling attitude when traveling on a ridge or a road.

That is, by adjusting the expansion and contraction amounts of the front hydraulic cylinder 36 and the rear hydraulic cylinder 37, as shown in FIG. 4, the forward leaning posture in which the ground height of the machine body frame 6 is lower toward the front side, and FIG. As shown in FIG. 5, the body frame 6 is provided such that the posture can be freely changed to an intermediate posture between the highest ascending posture and the lowest descending posture, such as a rearward tilting posture in which the ground height is lower toward the rear side, and it corresponds to the left and right crawler traveling devices B. By driving the front hydraulic cylinder 36 and the rear hydraulic cylinder 37 provided by selecting the posture of the crawler traveling device B for each of left and right, it is possible to perform left and right rolling adjustments and pitching adjustments. The height position and posture can be arbitrarily selected according to the work purpose.

Further, the abutment shaft members 48 which enter the lower surface side of the machine body frame 6 into the front support shaft 41 and the rear support shaft 46, respectively.
In the lowest descent position (road running position) shown in FIG. 2, these contacting shaft members 48 are brought into contact with the traveling machine body A from above and below, as shown in FIGS. All or part of the load of the traveling machine body A can be transmitted to the crawler traveling device B.

As described above, the second arm 43 constituting the rear swing link 35 drives and swings the swing links 34 and 35 separately, so that the traveling machine body A is moved relative to the crawler traveling device B. Although it is provided so that it can be driven up and down, it is not suitable for manufacturing errors, assembling errors, or long-term use of the hydraulic cylinders 36 and 37 and the rocking links 34 and 35 themselves that constitute the lifting drive mechanism C. Since it is possible to absorb a slight dimensional accuracy error such as the occurrence of backlash, it is also effective in smoothly operating the up-and-down drive mechanism C.

[Other Embodiments] 1. The crawler traveling device according to the present invention may be provided with a lubricating oil injecting pipe member that connects the lubricating oil injecting passage and the inside of the bearing boss portion. 2. The crawler traveling device according to the present invention may be provided with a wheel bracket in which the fulcrum boss portion and the plurality of bearing boss portions are assembled by welding or the like. 3. The crawler traveling device according to the present invention may support three or more grounding wheels adjacent to each other in the traveling direction on the wheel bracket. 4. The crawler traveling device according to the present invention is not limited to being provided in an agricultural work vehicle such as a combine, but may be provided in a work vehicle for civil engineering or construction, for example.

[Brief description of drawings]

FIG. 1 is a schematic side view of a crawler traveling work vehicle.

FIG. 2 is a side view of a main part for explaining the lowest descent posture of the crawler traveling type work vehicle.

FIG. 3 is a side view of a main part for explaining the most raised posture of the crawler traveling type work vehicle.

FIG. 4 is a side view of a main part for explaining a forward tilted posture of the crawler traveling type work vehicle.

FIG. 5 is a side view of a main part for explaining a rearward tilting posture of a crawler traveling work vehicle.

FIG. 6 is a plan view of the main parts of the crawler traveling device.

FIG. 7 is a side view of a main part of the crawler traveling device.

FIG. 8 is a sectional view of a main part of a crawler traveling device.

FIG. 9 is a sectional view of a main part of a crawler traveling device.

FIG. 10 is an explanatory diagram of a lifting drive mechanism.

FIG. 11 is an explanatory diagram of a lifting drive mechanism.

[Explanation of symbols]

7 truck frame 9 grounding wheels 12 crawler belt 18 fulcrum axis 19 Roller bracket 23 Boss for fulcrum 24 Bearing boss 27 Lubricating oil injection path 31 passages 32 plug

Front page continuation (72) Inventor Yusaku Yoshida 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Inventor Shigeyuki Hayashi 64, Ishizukita-machi, Sakai City Osaka Prefecture Kubota Sakai Factory Co., Ltd. 56) References JP 10-100954 (JP, A) JP 4-25623 (JP, A) Actual opening 3-84288 (JP, U) Actual opening 1-98085 (JP, U) Actual opening Sho 64-50179 (JP, U) Actual development Sho 64-25415 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 55/092 B62D 55/104

Claims (2)

(57) [Claims] 1. A fulcrum boss that is rotatably fitted onto a fulcrum shaft provided on a track frame, and a plurality of bearing bosses that rotatably support a ground roller that guides the ground side of a crawler belt. Is provided to support the grounding wheels adjacent to each other in the traveling direction so as to be swingable by a balance around the fulcrum shaft, and the lubricating oil injection path communicating with the inside of the fulcrum boss is provided to the bearing. Crawler traveling device that communicates with the inside of the boss. 2. The rolling wheel bracket is integrally formed of cast metal, and a communication passage that connects the inside of the fulcrum boss portion and the inside of the bearing boss portion is formed by cutting from one end side of the rolling wheel bracket. The crawler traveling device according to claim 1, wherein a plug that closes an opening on one end side of the communication passage is provided to communicate the lubricating oil injection passage with the inside of the bearing boss portion.