JPH0999874A - Upper roller fitting structure for crawler type travel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a crawler from being hooked when it is removed by dividing the spindles of upper rollers into two on the right and left, arranging a support pipe in the right and left directions on a truck frame, and inserting and fixing the spindles of the upper rollers into the support pipe from both sides of guide bodies. SOLUTION: Upper rollers 16 are arranged on a truck frame 12. A crawler 17 is made of rubber or the like. Guide bodies 17a, 17a guiding a drive sprocket are protruded at constant intervals along the inner periphery at the center of the right and left of the crawler 17. A support pipe 26 is fixed in the right and left directions on the truck frame 12. The spindles of the upper rollers 16 are divided into two on the right and left. The spindles are inserted into the support pipe 26 from both sides, and the guide bodies 17a are guided by the upper rollers 16. Pins 27 are inserted in the direction perpendicular to the spindles inserted into the support pipe 26 to fix the spindles. When the crawler 17 is to be removed, a pin 27 is removed, and the upper roller 16 on the outside is removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for easily removing a crawler (track) of a crawler type traveling device.

[0002]

2. Description of the Related Art A conventional crawler type traveling device is provided with a track frame at a lower portion of a machine body frame, and a drive sprocket, a driven wheel, a lower roller and an upper roller are provided on both left and right sides of the track frame, respectively. The crawler is wound around and the drive sprocket is rotated to drive the vehicle.

[0003]

The driven wheel of the crawler type traveling device in the prior art is constructed so as to be slidable in the front-rear direction. It was configured to relieve tension on the driven wheel when removed. However, a step is arranged 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 will be narrowed, and when releasing the tension of the crawler, it is difficult for the crawler to get caught. It took a lot of time.

[0004]

The present invention uses the following means in order to solve the above problems. That is, a drive sprocket is provided on one side in the front-rear direction of the track frame, driven wheels are arranged on the other side, and a guide body for preventing lateral displacement of the drive sprocket from the inner periphery is provided between the drive sprocket and the driven wheel. In a configuration in which an upper rolling wheel and a lower rolling wheel that wind a projecting crawler and guide both sides of the guide body so as not to be displaced laterally are arranged above and below the track frame, the spindles of the upper rolling wheel are divided into left and right sides. The support pipes are divided and arranged on the track frame in the left-right direction, and the support shafts of the upper wheel are inserted into and fixed to the support pipes from both sides of the guide body.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The construction of an embodiment of the crawler type tractor shown in the accompanying drawings will be described below. 1 is an overall side view of the crawler type tractor, FIG. 2 is a plan view of the same,
FIG. 3 is a side view of the tension part of the crawler type traveling device,
4 is a cross-sectional view taken along the line XX in FIG. 3, FIG. 5 is a cross-sectional view taken along the mounting portion of the upper roller, FIG. 6 is a cross-sectional view taken along the line YY in FIG. 3, and FIG. FIG.

The overall structure will be described with reference to FIGS. 1 and 2. In the crawler type tractor, the engine E is mounted on the front of the body frame 1 and housed in the hood 2.
A three-point-link type working machine mounting device A is arranged at the rear end of the machine body frame 1, a working machine B is mounted at the rear end of the working machine mounting device A, and the lifting means 4 allows it to move up and down. The working machine B of this embodiment is a rotary tiller, and the elevating means 4 is a hydraulic cylinder.

A cabin 3 is arranged at the rear of the bonnet 2, and a steering wheel 5 and a driver's seat 6 are provided inside the cabin 3 to form a driving section C. Steps 25, 25, a fuel tank 7, and a hydraulic oil tank 8 are arranged on both left and right sides of the cabin 3. Further, a front transmission case 2 is provided at the rear of the engine E via a clutch case.
0 is fixed, and a pair of hydraulic pumps P1 and P1 and a hydraulic pump P2 for working machine are arranged in series at the rear part of the front transmission case 20, and the hydraulic pumps P1 and P1 and the left and right hydraulic motors M and M are arranged. Are connected to each other through a pipe 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,
By sending pressure oil from the hydraulic pumps P1 and P1 to the hydraulic motors M and M, the hydraulic motors M and M are driven to drive the crawler type traveling device D disposed below the machine body frame 1. There is.

A rear mission case 21 is arranged 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 a universal joint 22. A PTO shaft 19 is projected rearward from the rear surface of the rear mission case 21, and a universal joint 23 is attached to the PTO shaft 19.
The power is transmitted to the working machine B via the.

In the crawler type traveling device D, a track frame 12 is fixed to the lower part of the machine body frame 1, and drive sprockets 13 driven by a hydraulic motor M are arranged at the left and right front ends of the track frame 12, A tension portion is arranged at the rear end of each of the left and right sides, and the driven wheel 14 is rotatably supported by the rear end of the tension portion. At the bottom of the truck frame 12, lower wheels 15
15 ... are arranged and the two lower rollers 15 are attached to the support 3
The support body 30 is rotatably supported at 0, and the support body 30 is swingably supported in the lower part of the track frame 12 in the front-rear direction to form an equalizer. The upper roller 16 is pivotally supported on the upper portion of the center of the track frame 12 in the front-rear direction, and the crawler 17 is wound around the drive sprocket 13, the driven wheel 14, the lower roller 15, and the upper roller 16. , The left and right drive sprockets 13, 13 are rotated by hydraulic motors M, M so as to travel.

As shown in FIG. 3, FIG. 6 and FIG. 7, the structure of the tension portion is such that the track frame 12 is formed in a quadrangular pipe shape in a sectional view, and a buffer spring 31 is provided in the track frame 12. The grease adjuster 32 is internally connected by being connected in series. That is, the support plate 33 is fixed vertically in the track frame 12, the center of the support plate 33 penetrates the support rod 34, and the slide plate 35 is fixed at the tip of the support rod 34. The buffer spring 31 is provided on the support rod 34 between the moving plate 35 and the support plate 33, and the position of the support rod 34 is adjusted by the nut 36.

A grease adjuster 32 is provided on the opposite side of the support plate 34 of the sliding plate 35. The grease adjuster 32 is composed of a cylinder 32a and a rod 32b, and the base of the cylinder 32a is fixed to the sliding plate 35. A holding plate 39 is provided on the outer periphery of the tip of the cylinder 32a.
Is fixed. The holding plate 39, as shown in FIG.
With a size to be accommodated in the idler fork 41, notches 39a, 39a ... Are provided at four corners of the holding plate 39, and flange portions 39b, 39b ... Are formed in the vertical and horizontal directions. The idler fork 41 is supported on the outer periphery of 39b.

Then, the rod 32b is attached to 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 its outer periphery in the vertical direction and the horizontal direction so that the sand can pass through when the expansion / contraction is performed.
Further, 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 so that the stopper 4 can be pulled out when the grease adjuster 32, the buffer spring 31, etc. are pulled out.
The holding plate 39 hits 0/40 so that it can be easily pulled out. In this way, the grease adjuster 32 and the buffer spring 31 can be easily assembled and disassembled. However, the stoppers 40 '・ 40' on the inner surface in the horizontal direction
Can also be provided (shown in FIG. 6). A bearing portion 41a is provided at the other end of the idler fork 41 to rotatably support the driven wheel 14. Then, when tensioning the crawler 17, grease is injected from the grease nipple 32c to extend the rod 32b.

The upper roller 16 which is the main part of the present invention
Is arranged on the track frame 12 so that the crawler 17 does not hang down without being laterally displaced. That is, as shown in FIGS. 4 and 5, the crawler 17 is made of rubber or the like, and a hole (not shown) into which a tooth portion of the drive sprocket 13 is fitted is formed in the left and right center of the crawler 17 as the drive sprocket. It is opened according to the pitch of 13 teeth, and the drive sprocket 1 is provided on both sides of the hole.
Guide bodies 17a, 17a for guiding both sides of the No. 3 are projected along the inner circumference at regular intervals. On the other hand, a support pipe 26 is fixedly mounted on the track frame 12 in the left-right direction, and a support shaft 28 of the upper roller 16 which is divided into left and right is inserted into the support pipe 26 from both sides. That is, the upper roller 16 is configured symmetrically, and the support shafts 28, 28 are inserted into the support pipe 26 from both sides so that the inner surface of the roller portion of the upper roller 16 guides the guide body 17a. There is.

Then, the support shaft 2 inserted into the support pipe 26
The pin 8 is fixed by being inserted in a direction perpendicular to the both by a pin 27. However, instead of the pin 27, it may be fixed by a bolt. The position of the pin 27 is such that the distance between the end face of the support shaft 28 and the pin insertion hole of the support shaft 28 is L.
1. The distance from the pin insertion hole of the support shaft 28 to the end surface of the support pipe 26 is L1, and the length is the same.
The upper rollers 16 are rotatably supported on the other ends of the support shafts 28 via bearings 29.

In such a structure, the crawler 17
When removing, the nut 36 of the tension portion is tightened, and the idler fork 41 is slid forward to loosen the tension. Conventionally, the crawler 17 was removed in this state, but 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 at the end, and the structure was very difficult to remove. Therefore, according to the present invention, by removing the pin 27 fixing the support shaft 28 of the outer upper rolling wheel 16, the outer upper rolling wheel 16 is removed, and the crawler 17 can be easily moved without the guide body 17a being caught. So that you can remove it.

[0016]

According to the present invention having the above-described structure, the following effects can be obtained. That is, since the upper wheel is divided into two parts on the left and right, without removing the step of the cabin, by removing only one of the outer side of the upper wheel, the guide body of the crawler can be easily removed without being caught, It can also be easily 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 machine can be lowered, and it is easy to get on and off.

[Brief description of drawings]

FIG. 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 the crawler type traveling device.

FIG. 4 is a sectional view taken along the line XX in FIG. 3;

FIG. 5 is a sectional view of a mounting portion of an upper roller.

6 is a sectional view taken along the line YY in FIG.

FIG. 7 is a sectional view taken along line ZZ in FIG.

[Explanation of symbols]

 D Crawler type traveling device 12 Track frame 13 Drive sprocket 14 Driven wheel 15 Lower roller 16 Upper roller 17 Crawler 17a Guide body 26 Support pipe 27 Pin 28 Spindle

Claims (1)

[Claims] 1. A drive sprocket is provided on one side in the front-rear direction of a track frame, and driven wheels are arranged on the other side, and a guide body for preventing lateral displacement of the drive sprocket is provided between the drive sprocket and the driven wheel. In a configuration in which an upper roller and a lower roller that wind a crawler protruding from the inner circumference and guide both sides of the guide body so as not to laterally shift are arranged above and below the track frame, a spindle of the upper roller is provided. Crawler-type running characterized in that the support pipe is divided into left and right, the support pipes are arranged in the left-right direction on the track frame, and the support shaft of the upper wheel is fixed by inserting it into the support pipe from both sides of the guide body. Device upper wheel mounting structure.