JPH10316059A - Suspension device of crawler vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension device by which reduction of size can be achieved, vibration can be restrained and fovarable riding comfortableness is enabled by providing a case fixed to the lower part of the side of a car body and first and second arms, each one end of which is fitted to the case, first and second rolling wheels being rotatably fitted to the other end hereof, and interposing a vibration buffer spring in the respective arms. SOLUTION: Each lower rolling wheel is provided in a pair and the respective central parts are freely rotatably supported on the end parts of a first arm 3 and a second arm 3a for suspension freely rotatably supported on an arm support part 4. A vibration damping spring is interposed between the forward end of each arm 3, 3a and the car body. The central part 32 of the arm 3 and the shaft part 31 of the other arm 3a are installed on the same axis in the case 7, and the arm 3 and the arm 3a are supported in such a manner as to relatively rotate round the axis 22 through bushes 6, 6a, 6b in both shaft support parts. Thus, vibration is damped so that the device can be simplified and reduced in size, and favorable riding comfortableness can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension system for a tracked vehicle, and more particularly to an independent suspension system in which each wheel is independently suspended from a vehicle body.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show an example of a suspension system for a tracked vehicle. The suspension shown in FIG. 3 is a so-called independent suspension. In FIG. 3, reference numeral 20 denotes a vehicle body, reference numeral 21 denotes a crawler belt that is driven by rotation (circulation running), and reference numeral 1 denotes a rolling contact on the crawler belt 21. And a plurality of lower wheels that are rotated.

Each of the lower wheels 1 has one end connected to an arm support 4.
It is rotatably supported at the other end of the suspension arm 3 which is rotatably supported at the other end. Reference numeral 2 denotes a shock-absorbing spring that is interposed between a portion of each of the arms 3 near the tip and the vehicle body and attenuates the vibration of the arms 3.

FIG. 5 shows details of the arm support 4 in the independent suspension shown in FIG. In FIG. 5, reference numeral 23 denotes a frame fixed to the vehicle body 20,
A cylindrical case 7 is fixed to the frame by bolts 8 together with the oil seal box 10. A shaft 31 is protruded from one end of the arm 3, and the shaft 31 is rotatably fitted to the inner periphery of the bush 6 pressed into the inner periphery of the case 7. 5b is an oil seal for sealing the shaft portion 31, and 9a and 9b are nuts for preventing the arm 3 from coming off.

When the tracked vehicle provided with the independent suspension device as described above runs, the crawler belt 21 rotates (circulates).
When the lower rolling wheel 1 is rotated up and down due to the ups and downs of the ground, the arm 3 that supports it swings up and down (vibrates) around the arm support 4, but this vibration is damped by the spring 2. I'm sullen. At this time,
In the arm support portion 4, the swing of the arm 3 causes the shaft portion 31 to move.
Rotate while being supported by the inner periphery of the bush 6. In this way, each lower wheel 1 is independently supported by the arm 3 while receiving the buffering action of the spring 2.

The suspension device shown in FIG. 4 is a device called a so-called coupled suspension device. In this case, a lower rolling wheel is rotated at both ends of an arm 3 whose center is supported by an arm supporting portion 4. Attach freely, near the end of arm 3 and body 2
A spring for buffering is interposed between the zero point and the zero point. FIG. 6 shows details of the arm supporting portion 4 of the coupled suspension. In FIG. 6, reference numeral 31 denotes a supporting shaft protruding from the center of the arm 3 and has a cylindrical shape. Is rotatably fitted to the bush 6 pressed into the case 7. Reference numeral 8 denotes a bolt for fixing the case 7 to the frame 23 together with the oil seal box 10, and 9a and 9b denote arms 3
It is a nut for retaining.

In the above-mentioned combined suspension system, two lower rolling wheels 1 and 1 are coupled and supported by an arm 3 integrated left and right supported by one arm supporting portion 4.

[0008]

In a vehicle provided with an independent suspension device as shown in FIGS. 3 and 5, each of the lower rolling wheels 1 independently controls the cushioning action of the spring 2. Since it is suspended on the arm 3 supported by the arm support portion 4 and received, the wheels 1 receive a buffering action and have a good ride with little vibration. Since the unit 4 is provided, the structure is complicated and large, and a large space is required for installing the vehicle body 20 on the frame 23.

Further, in a vehicle provided with a coupled suspension device as shown in FIGS. 4 and 6, an arm supporting portion 4 is provided at an intermediate portion between two lower rolling wheels 1 supported by an arm 3. , The arm support 4 is only half that of the independent suspension.

However, in such a coupled suspension device, since the arm 3 for supporting the rolling wheel 1 is provided integrally on both sides of the arm supporting portion 4, the swing of the rolling wheel 1 is restricted, The effect of damping vibration is small, and it is difficult to obtain a sufficiently good ride comfort.

An object of the present invention is to reduce the number of supporting portions of the arm to which the wheels are mounted to the same extent as that of the coupled suspension device, thereby simplifying the structure and reducing the size, and independently suspending the wheels. It is an object of the present invention to provide a tracked vehicle that suppresses vibration as much as possible and has good ride comfort.

[0012]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and the gist of the invention is to provide a case fixed to a lower side portion of a vehicle body and one end rotatably supported by the case. A first arm having a first wheel rotatably attached to the other end, and one end rotatably supported by the case with respect to the case and the first arm, respectively. And a second arm on which a second wheel is rotatably mounted, and a buffer means for damping vibration of each arm between the first arm and the second arm and the vehicle body. A suspension device for a tracked vehicle characterized by being interposed in each case.

[0013] According to the above means, of the plurality of rolling wheels arranged in parallel in the longitudinal direction of the vehicle body and rotated by the crawler belt,
By supporting the support portions of the first and second arms that individually and rotatably support the two wheels on the case so that the two arms can rotate relative to each other, each wheel is independently suspended. At the same time, only one supporting portion of the arm to the case is required for two rolling wheels, as in the case of the coupled suspension device.

Accordingly, each wheel can be independently suspended with a simple, compact, and compact structure equivalent to that of the coupled suspension device, vibrations are suppressed, and good riding comfort is obtained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is an external configuration diagram of a tracked vehicle according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating details of a suspension device of the vehicle.

In FIG. 1, 20 is a vehicle body, 21 is a crawler belt that is driven to rotate (circulate), and 1 is a plurality of lower rolling wheels that are rolled on the crawler belt 21 and rotated. Each of the lower rolling wheels 1 is a set of two, and a center portion is an arm 3 as a first arm for suspension rotatably supported by an arm supporting portion 4 and an arm 3a as a second arm. Are rotatably supported at the ends. 2 is each of the above arms 3,
This is a spring for damping the vibration of the arms 3 and 3a, which is interposed between the portion of the body 3 near the front end of the body 3a and the body 20.

FIG. 2 shows details of the arm supporting portion in the tracked vehicle. In FIG. 2, a frame 23 is fixed to the vehicle body 20, and a cylindrical case 7 is fixed to the frame 23 by bolts 8 with a flange portion thereof fastened together with the oil seal box 10.

In the arm support portion 4, the two
A hollow portion 32 is protruded from a supporting end of an arm 3 that supports one of the rolling wheels 1 as a set, and a middle end is provided at a supporting end of an arm 3a that supports another rolling wheel 1. An actual shaft portion 31 is protruded, and the hollow portion 32 and the shaft portion 31 are concentric (22 is the shaft center) via bushes 6, 6a, 6b described later, and are relatively rotatable. It is supported by.

That is, the cylindrical bush 6 is press-fitted into the inner periphery of the case 7, and the hollow portion 32 of the one arm 3 is rotatably fitted to the inner periphery of the bush 6. Further, on the inner periphery of the hollow portion 32 of the arm 3 on one side,
The bush 6a is press-fitted into the root side, and the bush 6b is press-fitted into the small-diameter hole on the end side. I have.

Reference numeral 5b denotes an oil seal for sealing oil from the inner surface of the outer bush 6a, which is housed and supported in the oil seal box 10. Reference numeral 5a denotes an oil seal for sealing oil from the inner bushes 6a and 6b, which is housed and supported in an oil seal box 10a fastened to the hollow portion 32 of the arm 3a by bolts 24. .

Numerals 9a and 9b are nuts fastened to the shaft end of the hollow portion 32 of the arm 3, and cooperate with the outer oil seal box 10 to restrict the axial movement of the hollow portion 32. ing. Numerals 9 and 9c are nuts fastened to the shaft end of the shaft portion 31 of the arm 3a, and regulate the axial movement of the shaft portion 31 in cooperation with the inner oil seal box 10a. .

As described above, in this embodiment,
An arm 3 that supports one of the lower wheels 1 as a set of two
3a for supporting the hollow portion 32 of the lower wheel 1 and the other lower wheel 1
And the two arms 3 and 3a are relatively rotated about the shaft center 22 by interposing the bushes 6 and 6a and 6b in both shaft support portions. It is configured to support as much as possible.

When the tracked vehicle provided with the suspension device having the above-described configuration travels, the lower rolling wheel 1 rotated by the rotation (circular movement) of the crawler belt 21 vibrates up and down individually due to ups and downs of the ground. , Arm 3 supporting this
And 3a oscillate (vibrate) up and down around the axis 22 in the arm support portion 4, and this vibration is caused by each of the arms 3 and 3a.
and is attenuated by a spring 2 interposed between the vehicle body a and the vehicle body.

At this time, a hollow portion 32 which is a supporting portion of the arm 3 supporting one of the lower rolling wheels 1 and 1 as a set to the case 7 and an arm supporting the other of the rolling wheels 1 3a is supported by the case 7 so as to be in the same axis 22 as a support portion for the case 7 and to be rotatable relative to the case 7, so that the rolling wheels 1, 1 are independently suspended. In addition to being an independent suspension, the arm support 4 is only required at one place as in the case of the coupled suspension, and is a simple and compact device.

[0025]

The present invention is configured as described above.
According to the present invention, the support portions of the first and second arms for individually and rotatably supporting two of the plurality of wheels are supported by the case so that both arms can rotate relative to each other. As a result, each wheel becomes an independent suspension that is independently suspended, and the case and support portion of each arm need only be one for each two wheels as in the case of the coupled suspension device.

Therefore, with a simple, compact and compact structure equivalent to the combined suspension device, it is possible to provide an independent suspension device for independently suspending each wheel, and vibration is sufficiently suppressed. A tracked vehicle with good ride quality can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a suspension device for a tracked vehicle according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part in the vicinity of an arm support of the suspension device of the tracked vehicle according to the embodiment of the present invention.

FIG. 3 is a schematic side view showing a first example of a conventional suspension device for a tracked vehicle.

FIG. 4 is a schematic side view showing a second example of a conventional suspension device for a tracked vehicle.

FIG. 5 is a cross-sectional view of a main part in the vicinity of an arm support of the first example shown in FIG. 3;

FIG. 6 is a cross-sectional view of a main part in the vicinity of an arm support of the second example shown in FIG. 4;

DESCRIPTION OF SYMBOLS 1 Lower wheel 2 Spring 3, 3a Arm 4 Arm support 5a, 5b Oil seal 6, 6a, 6b Bush 7 Case 9, 9, 9a, 9b, 9c Nut 10, 10a Oil seal box 31 Shaft 32 Hollow

Claims (1)

[Claims] 1. A case fixed to a lower side portion of a vehicle body,
One end is rotatably supported by the case, and the other end is provided with a first wheel rotatably mounted on the other end, and one end is connected to the case, and the case and the first arm are respectively provided. A second arm rotatably supported on the other end and a second wheel rotatably mounted on the other end, and a second arm between the first arm and the second arm and the vehicle body. ,
A suspension device for a tracked vehicle, wherein a buffer means for damping vibration of each arm is interposed.