JP3734046B2 - Upper roller mounting structure of crawler type traveling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a configuration for easily removing a crawler (crawler belt) of a crawler type traveling device.
[0002]
[Prior art]
Conventional crawler type traveling devices are provided with a track frame at the bottom of the fuselage frame, a drive sprocket, a driven wheel, a lower wheel and an upper wheel on the left and right sides of the track frame, respectively, and a crawler is wound around these. The drive sprocket is driven to rotate.
[0003]
[Problems to be solved by the invention]
The driven wheel of the crawler type traveling device in the prior art is configured to be slidable in the front-rear direction. Usually, the crawler is urged in a tensioning direction by a spring or the like, and the tension of the driven wheel is reduced when the crawler is removed. It was configured to relax. However, a step is disposed above the crawler, and this step is made as low as possible so that the operator can easily get on and off. However, if the step is lowered, the distance between the lower surface of the step and the upper roller becomes narrower. It was a lot of work.
[0004]
[Means for Solving the Problems]
The present invention uses the following means in order to solve the above problems.
A drive sprocket 13 is provided on one side in the front-rear direction of the track frame 12, a driven wheel 14 is disposed on the other side, a crawler 17 is wound between the drive sprocket 13 and the driven wheel 14, and the drive sprocket 13 is wound around the crawler 17. A guide body 17a that prevents lateral displacement is projected from the inner periphery, and left and right upper wheels 16 and 16 that guide both sides of the guide body 17a so as not to be laterally displaced, and left and right lower wheels 15 and 15 Are arranged above and below the track frame 12, and the left and right upper rollers 16 and 16 are pivotally supported by bearings 29 and 29 at one ends of left and right support shafts 28 and 28, respectively. the support pipe 26 in the lateral direction of the upper disposed, from opposite sides of the support pipe 26, respectively, inserted the other end of the left and right upper carrier rollers 16, 16 of the support shaft 28, 28 And, between both of the supporting pipe 26 and the support shaft 28, 28 is intended to fix and inserted in a direction perpendicular to the axial direction of the left and right pins 27, 27 support shaft 28, 28.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, the structure of the Example of the crawler type tractor shown to the accompanying drawing is demonstrated.
1 is an overall side view of a crawler type tractor, FIG. 2 is a plan view of the same, FIG. 3 is a side view of a tension portion of a crawler type traveling device, FIG. 4 is a cross-sectional view taken along line XX in FIG. 6 is a cross-sectional view taken along the line Y-Y in FIG. 3, and FIG. 7 is a cross-sectional view taken along the line ZZ in FIG. 3.
[0006]
The overall configuration will be described with reference to FIGS.
The crawler type tractor has an engine E mounted on the front of the body frame 1 and is housed in the hood 2. A three-point link type work machine mounting device A is disposed at the rear end of the machine body frame 1, and a work machine B is mounted at the rear end of the work machine mounting device A so that it can be moved up and down by the lifting means 4. In addition, the working machine B of a present Example is a rotary tiller, and the raising / lowering means 4 is a hydraulic cylinder.
[0007]
A cabin 3 is disposed at the rear of the bonnet 2, and a driving unit C is configured with a handle 5 and a driver's seat 6 inside the cabin 3. Steps 25 and 25, a fuel tank 7, and a hydraulic oil tank 8 are disposed on the left and right sides of the cabin 3. A front mission case 20 is fixed to the rear portion of the engine E via a clutch case, and a pair of hydraulic pumps P1 and P1 and a hydraulic pump P2 for work equipment are arranged in series at the rear portion of the front mission case 20. Thus, the hydraulic pumps P1 and P1 and the left and right hydraulic motors M and M are communicated with each other by pipes to form a closed circuit to form an HST transmission. The hydraulic motors M and M are arranged on the left and right crawler type traveling devices D, and the hydraulic frames are sent from the hydraulic pumps P1 and P1 to the hydraulic motors M and M to drive the hydraulic motors M and M, so that the machine frame The crawler type traveling device D arranged below 1 is driven.
[0008]
A rear mission case 21 is disposed at the rear of the body frame 1, and power is transmitted from the front mission case 20 to the rear mission case 21 via the universal joint 22. A PTO shaft 19 protrudes rearward from the rear surface of the rear mission case 21, and power is transmitted to the working machine B via the universal joint 23.
[0009]
In the crawler type traveling device D, a track frame 12 is fixed to the lower part of the body frame 1, and drive sprockets 13 driven by a hydraulic motor M are disposed at the left and right front ends of the track frame 12. A tension portion is disposed at the rear end, and a driven wheel 14 is rotatably supported by the rear end of the tension portion. .. Are disposed below the track frame 12, and the two lower wheels 15 are rotatably supported on the support 30, and the support 30 is positioned below the track frame 12. The equalizer is configured to be supported so as to be swingable in the front-rear direction. Then, an upper roller 16 is pivotally supported on the upper part of the center of the track frame 12 in the front-rear direction, and a crawler 17 is wound around the drive sprocket 13, the driven wheel 14, the lower wheel 15, and the upper wheel 16. The left and right drive sprockets 13 and 13 are rotated by hydraulic motors M and M so as to travel.
[0010]
As shown in FIGS. 3, 6, and 7, the structure of the tension portion is such that the track frame 12 is formed in a square pipe shape in cross-sectional view, and a buffer spring 31 and a grease adjuster 32 are provided in the track frame 12. Are connected in series. That is, the support plate 33 is fixed in the left-right vertical direction in the track frame 12, the support rod 34 passes through the center of the support plate 33, and the slide plate 35 is fixed at the tip of the support rod 34. A buffer spring 31 is interposed on a support rod 34 between the moving plate 35 and the support plate 33, and the position of the support rod 34 is adjusted by a nut 36.
[0011]
A grease adjuster 32 is provided on the side opposite to the support rod 34 of the sliding plate 35. The grease adjuster 32 includes a cylinder 32a and a rod 32b, and a base of the cylinder 32a is fixed to the sliding plate 35. A holding plate 39 is fixed on the outer periphery of the tip of 32a. As shown in FIG. 6, the holding plate 39 is sized to be accommodated in the idler fork 41, and is provided with notches 39a, 39a,... At the four corners of the holding plate 39, and the flanges 39b, 39b in the vertical and horizontal directions. Are formed so that they are supported by the idler fork 41 on the outer periphery of the flanges 39b, 39b,.
[0012]
A rod 32b is inserted into the cylinder 32a, and a holding plate 37 as shown in FIG. 7 is fixed to the tip of the rod 32b. The holding plate 37 is formed with notches 37a, 37a,... In the vertical direction and the horizontal direction of the outer periphery thereof so that earth and sand can pass through during expansion and contraction. The idler fork 41 is formed in a square pipe shape, and stoppers 40, 40 are provided on the inner surface in the vertical direction on the side where the grease adjuster 32 is inserted, and the stoppers 40, 40 are pulled out when the grease adjuster 32, the buffer spring 31, etc. are pulled out. The holding plate 39 hits and can be pulled out easily. In this manner, the assembly and disassembly of the grease adjuster 32 and the buffer spring 31 can be facilitated. However, stoppers 40 'and 40' can be provided on the inner surface in the horizontal direction (shown in FIG. 6). A bearing portion 41a is provided at the other end of the idler fork 41, and the driven wheel 14 is rotatably supported. And when tensioning the crawler 17, grease is inject | poured from the grease nipple 32c and the rod 32b is expanded.
[0013]
And the upper roller 16 which is the principal part of this invention is arrange | positioned on the track frame 12 so that the crawler 17 may not hang down without shifting | deviating to a horizontal direction. That is, as shown in FIGS. 4 and 5, the crawler 17 is made of rubber or the like, and a hole (not shown) in which a tooth portion of the drive sprocket 13 is fitted is formed in the left and right center of the crawler 17. The guide bodies 17a and 17a for guiding both sides of the drive sprocket 13 are projected at regular intervals along the inner circumference. On the other hand, a support pipe 26 is fixed on the track frame 12 in the left-right direction, and a support shaft 28 of the upper wheel 16 that is divided into left and right parts from both sides is inserted into the support pipe 26. That is, the upper rolling wheel 16 is configured to be bilaterally symmetric, the support shafts 28 and 28 are inserted into the support pipe 26 from both sides, and the inner surface of the roller portion of the upper rolling wheel 16 guides the guide body 17a. Yes.
[0014]
The support shaft 28 inserted into the support pipe 26 is fixed by being inserted in a direction perpendicular to both by the pins 27. However, it may be fixed by bolts instead of the pins 27. The position of the pin 27 is such that the distance between the end surface of the support shaft 28 and the pin insertion hole of the support shaft 28 is L1, and the distance between the pin insertion hole of the support shaft 28 and the end surface of the support pipe 26 is L1. Same length. The upper rollers 16, 16 are rotatably supported via bearings 29 at the other ends of the support shafts 28, 28.
[0015]
In such a configuration, when removing the crawler 17, the nut 36 of the tension portion is tightened, and the idler fork 41 is slid forward to relax the tension. Conventionally, the crawler 17 is removed in this state. However, as shown in FIG. 4, the step 25 is disposed above the crawler 17, and the distance L2 between the step 25 and the crawler 17 is narrowed. The guide body 17a was caught on the surface, and the structure was very difficult to remove. Therefore, in the present invention, by removing the pin 27 that fixes the support shaft 28 of the outer upper roller 16, the outer upper roller 16 is removed, and the guide body 17 a portion is not caught and the crawler 17 is easily caught. Can be removed.
[0016]
【The invention's effect】
The present invention configured as described above has the following effects.
That is, because the upper roller is divided into left and right parts, the crawler guide body can be easily removed without being caught by simply removing one of the outer sides of the upper roller without removing the cabin step. . Also, it can be easily done when assembled in reverse.
And even if the gap between the step and the upper surface of the crawler is small, the crawler can be removed, the height of the step can be kept low, the overall height of the airframe can be lowered, and it is easy to get on and off.
[Brief description of the drawings]
FIG. 1 is an overall side view of a crawler tractor.
FIG. 2 is also a plan view.
FIG. 3 is a side view of a tension portion of the crawler type traveling device.
4 is a cross-sectional view taken along the line XX in FIG. 3. FIG.
FIG. 5 is a cross-sectional view of a mounting portion of an upper wheel.
6 is a cross-sectional view taken along arrow YY in FIG. 3;
7 is a cross-sectional view taken along the line ZZ in FIG. 3;
[Explanation of symbols]
D crawler type traveling device 12 track frame 13 drive sprocket 14 driven wheel 15 lower wheel 16 upper wheel 17 crawler 17a guide body 26 support pipe 27 pin 28 support shaft

Claims (1)

A drive sprocket 13 is provided on one side of the track frame 12 in the front-rear direction, a driven wheel 14 is disposed on the other side, a crawler 17 is wound between the drive sprocket 13 and the driven wheel 14, and the drive sprocket 13 is wound around the crawler 17. The guide body 17a that prevents lateral displacement is projected from the inner periphery,
In a configuration in which left and right upper rollers 16 and 16 for guiding both sides of the guide body 17a so as not to be laterally displaced and left and right lower rollers 15 and 15 are arranged above and below the track frame 12,
The left and right upper rollers 16 and 16 are configured to be pivotally supported by bearings 29 and 29 at one ends of left and right support shafts 28 and 28, respectively.
A support pipe 26 is disposed in the left-right direction on the track frame 12, and the other ends of the support shafts 28, 28 of the left and right upper rollers 16, 16 are inserted from both sides of the support pipe 26, respectively. The upper part of the crawler type traveling device characterized in that the left and right pins 27 and 27 are inserted and fixed between the shaft 26 and the support shafts 28 and 28 in a direction perpendicular to the axial direction of the support shafts 28 and 28. Roller mounting structure.

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