JPH08548B2 - Track presser wheel with track adjustment mechanism - 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 belt pressing wheel having a crawler belt tension adjusting mechanism, and more specifically, a suspension mechanism independent of a sprocket suspension mechanism mounted on a rear drive shaft of a vehicle is provided. The present invention relates to a crawler belt pressing wheel.

[0002]

As is well known, a sprocket attached to a rear drive shaft of a vehicle, a crawler belt pressing wheel divided into a front crawler belt pressing wheel and a rear crawler belt pressing wheel, and the sprocket and the crawler belt pressing wheel. A crawler belt pressing wheel in which a suspension mechanism different from the suspension mechanism of the sprocket of the crawler belt drive mechanism composed of The screw is screwed on the outer peripheral surface and is screwed on the inner peripheral surface of the hole through which this screw is inserted, and the screw is engaged with the screw. A support connected to the crawler belt pressing wheel, which is attached and includes a moving pipe that moves in the front-rear direction by rotation of the screw and a connecting body fixed to the moving pipe. The but linked track tension adjustment mechanism,
There is a crawler belt pressing wheel provided on the upstream side of the suspension mechanism of the crawler belt pressing wheel in the process of transmitting the impact force received from the ground.

As a technique provided with a crawler belt pressing wheel of this type, there is a technique disclosed in Japanese Utility Model Publication No. 48-44355. In particular, focusing on the crawler belt tension adjusting mechanism that adjusts the crawler belt tension by moving the crawler belt pressing wheel in the front-rear direction,
In the prior art, the above-mentioned connecting body is directly connected to the support shaft connected to the rear crawler belt pressing wheel of the front and rear crawler belt pressing wheels.

[0004]

According to the above prior art, there are problems in the following points. That is, since the connecting body in the crawler belt tension adjusting mechanism was directly connected to the rear crawler belt pressing wheel, the impact force from the ground received by the rear crawler belt pressing wheel was easily transmitted directly to the moving hype and the screw. That is, the impact force from the ground that the rear crawler belt pressing wheel receives is absorbed by the independent suspension mechanism of the crawler belt pressing wheel, but the impact force is transmitted to the moving pipe and the screw before being transmitted to the suspension mechanism. However, there is a problem in that stress is likely to be generated in the moving pipe and the screw portion, and it tends to be a weak point portion when the crawler belt pressing ring works well in conjunction with the suspension mechanism.

Particularly, when the support shaft is connected to the two crawler belt pressing wheels, the front crawler belt pressing wheel and the rear crawler belt pressing wheel, the impact force becomes even stronger, and the problem becomes serious. It was a thing.

Therefore, an object of the present invention is to properly transmit the crawler belt pressing wheel to the suspension mechanism even if the impact force from the ground is transmitted to the crawler belt tension adjusting mechanism of the crawler belt pressing wheel, and thereby the crawler belt pressing wheel is suspended. It is to provide technology that works well in conjunction with.

[0007]

[Means for Solving the Problems] In order to solve the above object,
The present invention has the following technical means. That is, the present invention will be described with reference to the reference numerals in the accompanying drawings corresponding to the embodiments. According to the present invention, the sprocket 2 mounted on the rear drive shaft of the vehicle, the front crawler belt pressing wheel 4a, and the rear crawler belt pressing wheel 4b are described. A suspension mechanism 17b different from the suspension mechanism 17a of the sprocket 2 in the crawler belt drive mechanism including the crawler belt pressing wheel 4 and the crawler belt 5 mounted over the sprocket 2 and the crawler belt pressing wheel 4. Is an independently arranged crawler belt pressing wheel 4, which extends along the front-rear direction Y, is rotated by adjusting bolts 25 at both ends, and has a screw threaded on the outer peripheral surface, and the screw 24. A screw is threaded on the inner peripheral surface of the hole through which 24 is inserted, and the screw is engaged with and attached to the screw 24. From the ground 20, a crawler belt tension adjusting mechanism 15 including a moving pipe 26 that moves in the rearward direction Y and a connecting body 30 that is fixed to the moving pipe 26, and a supporting shaft 12 that is connected to the crawler belt pressing wheel 4 is connected. In the crawler belt pressing wheel 4 provided on the upstream side of the suspension mechanism 17b of the crawler belt pressing wheel 4 in the process of transmitting the received impact force, the crawler belt tension adjusting mechanism 15 has a groove 29 formed in the front-rear direction Y. A guide rail 27 and a moving body 28 having a convex portion 28a fitted to the guide rail 27 and moving in the front-rear direction Y along the guide rail 27 are provided. The shaft 12 is connected, and the front side crawler belt pressing wheel 4a and the rear side crawler belt pressing wheel 4b are connected by a supporting frame 9 while keeping the front-rear distance S constant. The track tension adjustment mechanism 15 to the frame 9
A crawler belt pressing wheel having a crawler belt tension adjusting mechanism, characterized in that a support shaft 12 connected to the crawler belt is connected.

Another characteristic is that the sprocket 2 has a rear surface 2b of the sprocket 2 on the rear surface 2b side.
The back side ring 32, which has a disk shape and covers the outer periphery 32b bent at a right angle toward the outside opposite to the sprocket 2, forms a gap 34 between the back surface 2b of the sprocket 2 and the inner surface 32a of the back side ring 32. Is provided and attached.

[0009]

With the above structure, how to use it will be described. That is, in order to drive the vehicle in accordance with the quality of the ground on which the vehicle is running, the situation, etc., the crawler belt pressing wheel 4 is moved in the front-rear direction Y by the adjustment of the crawler belt tensioning mechanism 15 to adjust the tension of the crawler belt 5. Make adjustments.

More specifically, the adjusting bolt 25 is rotated to rotate the screw 24. Screw 2 above
By the rotation of 4, the moving pipe 26 meshed with the screw moves in the front-rear direction Y. By this movement of the moving pipe 26, the moving body 28 moves in the front-rear direction Y along the guide rail 27 via the connecting body 30. And this moving body 28
Crawler belt pressing wheel 4 moves in the front-rear direction Y via the support shaft 12 and the support frame 9.

[0011]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. That is, a sprocket 2 is attached to a rear drive shaft of a truck 1 which is a vehicle, and a crawler belt pressing wheel 4 is attached to a frame 3 of the truck 1, and the crawler belt 5 extends across the sprocket 2 and the crawler belt pressing wheel 4. Is mounted, and the sprocket 2 is provided with a suspension mechanism 17a including a leaf spring 6 and
A suspension mechanism 17b including a spring 7 and a shock absorber 8 is arranged on the crawler belt pressing wheel 4.

More specifically, the sprocket 2 is attached to the rear drive shaft of the truck 1,
The rear drive shaft is rotated by the drive of, and the sprocket 2 is rotated by the rotation of the rear drive shaft.

Next, paying attention to the crawler belt drive mechanism attached to the frame 3 of the track 1, the frame 3 of the track 1 is divided into a left frame 3a and a right frame 3b along the left-right direction N of the track 1. A left subframe and a right subframe 3d are attached to the left frame 3a and the right frame 3b, respectively. Then, the left frame 3a and the right sub-frame 3
d, in each of the right frame 3b and the left sub-frame,
Together with the sprocket 2 and the crawler belt 5, a crawler belt pressing wheel 4 which constitutes a crawler belt drive mechanism is arranged via various parts.

Therefore, the components arranged on the left frame 3a and the right sub-frame 3d and the crawler belt pressing wheel 4 will be described in detail. The crawler belt pressing wheel 4 is a front crawler belt along the front-rear direction Y of the track 1. It is divided into a pressing wheel 4a and a rear crawler belt pressing wheel 4b, and the front crawler belt pressing wheel 4a and the rear crawler belt pressing wheel 4b are connected by a support frame 9. The front crawler belt pressing wheel 4a and the rear crawler belt pressing wheel 4b are rotatably mounted on the support frame 9 via the mounting shaft 10 and the ball bearing 11, respectively.

A support shaft 12 extending from a crawler belt tension adjusting mechanism 15 described later is fixedly connected to the support frame 9, and the support frame 9 is supported by the support shaft 12. One end 13a of the left swing arm 13 is fixedly connected to the crawler belt tension adjusting mechanism 15. On the other hand, the fixed arm 1 is attached to the right sub-frame 3d.
One end 14a of No. 4 is fixedly connected. Then, the other end 13b of the left swing arm 13 and the fixed arm 14
The other end 14b is attached to the fixed arm 14 such that the left swing arm 13 is rotatable.

Next, a suspension mechanism 17b including a spring 7 and a shock absorber 8 is arranged on the outer frame 16 of the crawler belt tension adjusting mechanism 15. That is, the suspension mechanism 17b is arranged on the downstream side of the crawler belt tension adjusting mechanism 15 in the process of transmitting the impact force received from the ground 20 via the crawler belt pressing wheel 4. The spring 7 is wound in a coil shape, and one end of the spring 7 is attached to the outer mold 16 via a lower spring receiver 18 fixed to the outer mold 16, and the other end of the spring 7 is also attached. Is attached to the left frame 3a via the upper spring receiver 19 fixed to the left frame 3a. And the spring 7
Is the ground 20 that the crawler belt pressing wheel 4 receives via the crawler belt 5.
It reduces the impact force from and shrinks, and recovers with a repulsive force when the external force disappears. Next, regarding the shock absorber 8, the shock absorber 8 is divided into two, a first shock absorber 8a and a second shock absorber 8b, both of which use a tubular oil damper. It is a thing. One end 21a of the piston rod 21 of the shock absorber 8
Is fixedly connected to the outer mold frame 16, and the other end of the outer cylinder 22 of the shock absorber 8 extends in the left-right direction N around the mounting portion 23 of the shock absorber 8 with the left frame 3a. The shock absorber 8 is attached to the left frame 3a so that the shock absorber 8 is rotatable along the shock absorber 8. The shock absorber 8 moderates the recovery when the spring 7, which is softened by the impact force from the ground 20 that the crawler belt pressing wheel 4 receives via the crawler belt 5, is restored by the repulsive force. Hold down, spring 7
The attenuation of is quickly performed.

Next, the crawler belt tension adjusting mechanism 15 in which the support shaft 12 for supporting the support frame 9 is continuous will be described in detail. In the outer mold frame 16, its surface in the front-rear direction Y of the outer mold frame 16 will be described. The screw 24 is disposed over the front wall 16a and the rear wall 16b forming a right angle.
One end and the other end of are fixed to the outer surfaces of the front wall 16a and the rear wall 16b of the outer formwork 16 by adjusting bolts 25, respectively. The outer peripheral surface of the screw 24 is threaded. A moving pipe 26 is attached to the screw 24, and an inner peripheral surface of a hole of the moving pipe 26 through which the screw 24 is inserted meshes with a screw cut on the outer peripheral surface of the screw 24. Is screwed.

Further, in the outer mold frame 16, the outer mold frame 1
6 of the guide rail 2 from the front wall 16a to the rear wall 16b.
7 are provided. A groove 29 is formed in the guide rail 27 so that the moving body 28 can move in the front-rear direction Y along the guide rail 27, and the convex portion 28 a of the moving body 28 is formed in the groove 29 of the guide rail 27. By being fitted, the moving body 28 is arranged with respect to the guide rail 27.

Then, the moving pipe 26 and the moving body 28.
And are connected by a connecting body 30. The support shaft 12 is fixedly attached to the side surface 28b of the moving body 28. That is, when the adjusting bolt 25 is adjusted to rotate the screw 24, the moving pipe 26 moves in the longitudinal direction of the screw 24, that is, the front-rear direction Y.
By the movement of the moving pipe 26 in the front-rear direction Y, the moving body 28 connected by the connecting body 30 also moves in the front-rear direction Y along the guide rail 27. Then, the support shaft 12 is moved in the front-rear direction Y by the movement of the moving body 28, and the support shaft 1
The support frame 9 fixed to 2 and the crawler belt pressing wheel 4 attached to the support frame 9 also move in the front-rear direction Y.

A crawler belt 5 formed integrally with rubber is mounted over the sprocket 2 and the crawler belt pressing wheel 4. That is, the tension of the crawler belt 5 mounted over the sprocket 2 and the crawler belt pressing wheel 4 can be adjusted by moving the crawler belt pressing wheel 4 in the front-rear direction Y.

A trailing arm 36 is attached across the outer frame 16 of the crawler belt tension adjusting mechanism 15 and the fixed plate 37 attached to the left frame 3a. The trailing arm 36 is rotatably supported with respect to the outer frame 16 and also with a fixed plate 37 so as to be rotatable, and assists in positioning the crawler belt pressing wheel 4. Is to do.

The parts arranged on the left frame 3a and the right sub-frame 3d and the crawler belt pressing wheel 4 have been described above in detail, but the parts arranged on the right frame 3b and the left sub-frame and The same applies to the crawler belt pressing wheel 4, and the suspension mechanism 17b of the crawler belt pressing wheel 4 is independently provided for each of the left and right crawler belt pressing wheels 4 of the track 1.

Next, paying attention to the sprocket 2, the front side ring 31 and the back side ring 32 are provided on the front surface 2a side and the back surface 2b side of the sprocket 2, respectively, via the pin 33 and the collar 38, and the sprocket 2 rear surface 2b. And the inner surface 32a of the back side ring 32 are provided with a gap 34 between them. The front side ring 31 and the back side ring 32 are disc-shaped, and the peripheral portion 32b is bent at a right angle toward the outside on the side opposite to the sprocket 2.
Further, the sprocket 2 has a sediment escape hole 35 penetratingly formed from the front surface 2a of the sprocket 2 to the back surface 2b of the sprocket 2, and the sediment escape hole 3
A plurality of 5 are formed.

The shock absorber 8 of the suspension mechanism 17b of the crawler belt pressing wheel 4 is a cylindrical oil damper, but an air damper or the like may be used instead. Although the suspension mechanism 17a of the sprocket 2 is the leaf spring 6 in this embodiment, a suspension mechanism 17a including a spring 7 and a shock absorber 8 may be used instead.

With the above-mentioned structure, focusing on the movement during use, the sprocket 2 and the crawler belt pressing wheel 4 are formed by the suspension mechanism 17a composed of the leaf spring 6 and the suspension mechanism 17a composed of the spring 7 and the shock absorber 8, respectively. The weight on the rear side of the truck 1 is evenly applied to both the sprocket 2 and the crawler belt pressing wheel 4. When an impact is applied from the ground 20 while the truck 1 is traveling, the impact force is absorbed by each of the independent suspension mechanism 17a of the sprocket 2 and suspension mechanism 17b of the crawler belt pressing wheel 4. At this time, the left suspension mechanism 17b and the right suspension mechanism 17b of the crawler belt pressing wheel 4 independently receive an impact force from the ground 20 and absorb the impact force.

In order to drive the truck 1 in accordance with the quality and condition of the ground surface 20, the crawler belt pressing wheel 4 is moved in the front-rear direction Y by the adjustment of the crawler belt tension adjusting mechanism 15, and Adjust the tension.

As described above, since the suspension mechanism 17a of the sprocket 2 and the suspension mechanism 17b of the crawler belt pressing wheel 4 are independently arranged, the ground 20 of the sprocket 2 and the crawler belt pressing wheel 4 is provided.
Grounding to can be completed with proper grounding pressure.

[0028]

As described in detail above, according to the first aspect of the present invention, by providing the movable body and the guide rail, the crawler belt pressing wheel can be moved in the front-rear direction,
Even if the impact force from the ground is transmitted to the crawler belt tension adjusting mechanism, it is transmitted to the suspension mechanism through the moving body and the guide rail, and the moving pipe and the screw, and the moving pipe and the screw become weak points. It is difficult, and the impact force can be satisfactorily transmitted to the suspension mechanism, so that the crawler belt pressing wheel can work well in conjunction with the suspension mechanism.

In addition, particularly when the support shaft is connected to the two crawler belt pressing wheels, the front crawler belt pressing wheel and the rear crawler belt pressing wheel, the impact force becomes stronger, but the impact force is also endured. It is easy to be damaged.

Further, the support frame connecting the front crawler belt pressing wheel and the rear crawler belt pressing wheel is connected to the support shaft supported by the moving body which moves in the front-rear direction along the guide rails. The front crawler belt pressing wheel and the rear crawler belt pressing wheel can be moved integrally in the front-rear direction, and the front-rear distance between the front crawler belt pressing wheel and the rear crawler belt pressing wheel is always kept constant. Therefore, the optimum distance between the front and rear crawler belt pressing wheels and the rear crawler belt pressing wheel can always be kept constant.

According to a second aspect of the present invention, since the back side ring is provided with a gap provided on the back side of the sprocket, earth and sand and the like can escape from the gap, and the earth and sand and the like are clogged on the back side of the sprocket. It is possible to reduce clogging of the rear drive shaft on the back side of the sprocket with dirt and the like. In particular, if a substantially similar front side ring is attached to the front side of the sprocket in accordance with the back side ring, and if a plurality of earth and sand escape holes are further formed on the sprocket, the synergistic effect of these causes the sand and the like of the back side ring The extraction effect can be obtained. Further, since the peripheral portion is bent at a right angle, the width becomes large in the left-right direction, and it is easy to prevent splashing of earth and sand etc. from the crawler track, and in addition, it is possible to keep the weight of the back side ring suppressed. .

[Brief description of drawings]

FIG. 1 is a diagram showing a usage state of a crawler belt pressing wheel provided with a crawler belt tension adjusting mechanism according to the present invention.

FIG. 2 is a view showing a use state in which a crawler belt pressing wheel provided with a crawler belt tension adjusting mechanism according to the present invention is partially omitted.

FIG. 3 is a partially omitted plan view of a crawler belt pressing wheel having a crawler belt tension adjusting mechanism according to the present invention.

FIG. 4 is a partially omitted side view of a crawler belt pressing wheel having a crawler belt tension adjusting mechanism according to the present invention.

FIG. 5 is a partially omitted front view of a crawler belt pressing wheel having a crawler belt tension adjusting mechanism according to the present invention.

FIG. 6 is a plan view including an internal view of the crawler belt tension adjusting mechanism of the crawler belt pressing wheel including the crawler belt tension adjusting mechanism according to the present invention.

FIG. 7 is a side view of a crawler belt pressing wheel support frame and a crawler belt tension adjusting mechanism having a crawler belt tension adjusting mechanism according to the present invention.

FIG. 8 is a view of a sprocket and a side ring of a crawler belt pressing wheel having a crawler belt tension adjusting mechanism according to the present invention.

[Explanation of symbols]

 1 track 2 sprocket 2a sprocket front surface 2b sprocket back surface 3 frame 3a left frame 3b right frame 3d right subframe 4 crawler track pressing ring 4a front crawler track pressing ring 4b rear crawler track pressing wheel 5 crawler belt 6 leaf spring 7 spring 8 shock absorber 8a First Shock Absorber 8b Second Shock Absorber 9 Support Frame 10 Mounting Shaft 11 Ball Bearing 12 Support Shaft 13 Left Swing Arm 13a Left Swing Arm One End 13b Left Swing Arm Other End 14 Fixed Arm 14a Fixed Arm One End 14b The other end of the fixed arm 15 Crawler belt tension adjusting mechanism 16 Outer formwork 16a Outer formwork front wall 16b Outer formwork rear wall 17a Sprocket suspension mechanism 17b Crawler track pressing wheel suspension mechanism 18 Lower spring support 19 Upper space Ring holder 20 Ground 21 Piston rod 21a One end of piston rod 22 Outer cylinder 22a One end of outer cylinder 23 Mounting part 24 Screw 25 Adjusting bolt 26 Moving pipe 27 Guide rail 28 Moving body 28a Convex part 28b Side surface of moving body 29 Groove 30 Connecting body 31 Front Side Ring 32 Back Side Ring 32a Back Side Ring Inner Side 32b Peripheral Area 33 Pin 34 Gap 35 Sediment Release Hole 36 Trailing Arm 37 Fixing Plate 38 Color N Left / Right Direction Y Front / Back Direction S Front-to-Back Distance

Claims (2)

[Claims] 1. A sprocket 2 mounted on a rear drive shaft of a vehicle, a crawler belt pressing wheel 4 divided into a front crawler belt pressing wheel 4a and a rear crawler belt pressing wheel 4b, the sprocket 2 and abdominal band pressing wheel 4 described above. A crawler belt pressing wheel 4 in which a suspension mechanism 17b other than the suspension mechanism 17a of the sprocket 2 among the crawler belt driving mechanism including the crawler belt 5 mounted over the crawler belt 5 is independently provided in the front-rear direction Y.
A screw 24 that extends along the circumference and is rotated by adjusting bolts 25 at both ends and has a threaded outer peripheral surface.
And a screw is threaded on the inner peripheral surface of the hole through which the screw 24 is inserted, and the screw is engaged with and attached to the screw 24, and is moved in the front-rear direction Y by the rotation of the screw 24. A process in which the impact force received from the ground 20 is transmitted to the crawler belt tension adjusting mechanism 15 including the moving pipe 26 and the connecting body 30 fixed to the moving pipe 26, to which the support shaft 12 connected to the crawler belt pressing wheel 4 is connected. By the way, the suspension mechanism 1 of the crawler belt pressing wheel 4
In the crawler belt pressing wheel 4 provided on the upstream side of 7b, the crawler belt tension adjusting mechanism 15 includes a guide rail 27 having a groove 29 formed in the front-rear direction Y, and a convex portion 2 of the guide rail 27.
8a is fitted and is provided with a moving body 28 that moves in the front-rear direction Y along the guide rail 27. The moving body 28 is connected with the continuous body 30 and the support shaft 12, and the front crawler belt pressing is performed. The wheel 4a and the rear crawler belt pressing wheel 4b are connected by a supporting frame 9 while keeping the front-rear distance S constant, and the supporting shaft 12 connected to the crawler belt tension adjusting mechanism 15 is connected to the supporting frame 9. A crawler belt pressing wheel having a crawler belt tensioning mechanism characterized by being. 2. The sprocket 2 has a disk-shaped back side ring that covers the back surface 2b of the sprocket 2 on the back surface 2b side, and a peripheral portion 32b is bent at a right angle toward the outside on the opposite side of the sprocket 2. 2. The crawler belt pressing wheel having a crawler belt tension adjusting mechanism according to claim 1, wherein 32 is attached with a gap 34 between the back surface 2b of the sprocket 2 and the inner side surface 32a of the back side ring 32.