JPH082452A - Track roller supporting mechanism for crawler type vehicle - Google Patents

Abstract

PURPOSE:To hold the back surface of a crawler by means of a roller on one side even when a roller on the other side runs on a projecting object and the like so as to surely prevent the rollers from falling off by employing a structure by which the track rollers arranged in parallel on the inside and on the outside can be independently oscillated in the vertical direction. CONSTITUTION:Respective track rollers 11, 12 arranged in parallel in the width direction for supporting a crawler are individually supported by means of supporting mechanisms 30, 50 having the same structure. Therefore, the mechanism is explained in the supporting mechanism 30. A swing arm 31, which is oscillational in the vertical direction while setting an oscillation shaft 15 as the center, is arranged. The swing arm 31 consists of a roller side arm 32 and a vehicle body side arm 42. The roller side arm 32 consists of a pair of arm plates 34, 35 on the left and the right sides, and a track roller 11 is installed freely rotationally in a roller shaft 36 suspended between the tip parts of the arm plates 34, 35 via a bearing 37. The vehicle body frame side arm 42 is formed of a single plate, and a coil spring 21 is arranged between the tip of the vehicle body frame side arm 42 and a vehicle body frame 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track roller support mechanism for a crawler type vehicle.
The present invention relates to a track roller support mechanism in which a track roller does not come off from a crawler while traveling on an uneven road surface.

[0002]

2. Description of the Related Art As shown in FIG. 1, a crawler type track 1 has a pair of left and right crawlers 2, 3, which are front and rear driving sprockets 4, 5 and a driven sprocket 6, respectively.
They are bridged between 7 and form an endless orbit. The trajectories of the crawlers 2 and 3 on the side of the traveling road surface are defined by a plurality of track roller groups 9 supported so as to be vertically swingable with respect to the vehicle body frame 8. The track roller group 9 has a configuration in which a plurality of pairs of track rollers are arranged at regular intervals in the longitudinal direction of the crawler, and four pairs are arranged in the illustrated example.

As shown in FIGS. 5 and 6, a pair of track rollers 11 and 12 arranged in the width direction of the crawler are integrally supported in a state of vertically swinging. That is,
A pair of left and right support plates 1 fixed to the lower surface of the body frame 8.
A swing shaft 15 is supported between 3 and 14 in the vehicle width direction. The swing shaft 15 supports a pair of left and right bell cranks 16 and 17 in a swingable state around this. A connecting rod 18 is bridged between the ends of the bell cranks 16 and 17, and track rollers 11 and 12 are rotatably provided on the outer circumference of the connecting rod 18 via bearings 19 and 20, respectively. Are installed respectively. The other ends of the bell cranks 16 and 17 are
It is connected to the body frame 8 side via a coil spring 21.

In this way, each track roller 11, 12 is
Is supported so that it can swing up and down, it is possible to move up and down following the unevenness of the running surface.

Here, the body frame 8 is designed so that such swinging does not occur beyond the expansion and contraction limit of the coil spring 21.
A pair of stoppers (a lower limit stopper and an upper limit stopper) 22 and 23 are attached to the front side and the rear side, respectively, and these limit the vertical swing width.

[0006]

The conventional track roller supporting mechanism having the above-mentioned structure has the following problems to be solved.

First, the pair of track rollers 11 and 12 arranged in the vehicle width direction (width direction of the crawlers) are connected to each other by the bell cranks 16 and 17 supporting them, so that It swings up and down as a unit. Therefore, as shown in FIG. 5, for example, when the inner track roller 12 rides on the protrusion S or the like on the traveling road surface G, the crawler 2 is inclined. But,
Since the track rollers 11 and 12 integrally move upward, the outer track roller 11 is separated from the back surface of the crawler 2. When the amount of movement of the track roller 11 is large, the track roller 11 may move above the upper end of the guide projection 2a formed on the back surface of the crawler 2 and come off the track roller 11.

Second, as described above, the bell crank 1
Since the downward swing amount of 6 and 17 is limited by the lower limit stopper 22, the downward movement limit of the track rollers 11 and 12 supported by these is also determined. Therefore, as shown in FIG. 6, when the track rollers 11 and 12 pass through a deep recess G1 or the like that exceeds the lower limit of movement, the track rollers 11 and 12 of the crawler 2 fitted in the recesses. I can't follow the part. As a result, the track rollers 11 and 12 may come off the guide protrusions 2a and 3a on the back surface of the crawler 2.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to propose a track roller supporting mechanism capable of preventing the track roller from coming off the crawler.

[0010]

In order to solve the above-mentioned problems, the track roller support mechanism for a crawler type vehicle of the present invention has first and second track rollers arranged in the width direction to support the crawler. A track roller, a first swing arm that rotatably supports the first track roller, a second swing arm that rotatably supports a second track roller, and swings of these swing arms. A swing shaft that defines a center of motion is provided, and the first and second swing arms are attached to the swing shaft so as to be rotatable independently of each other.

By adopting this structure, the first and second track rollers arranged in the width direction of the crawler are
They independently rock following the part of the crawler they support. Therefore, when one side of the crawler rides on a protrusion or the like, only the corresponding track roller moves upward. Therefore, the track roller on the other side does not come off from the crawler. When three or more roll rack rollers are arranged in the width direction, they may be separately swingable, or they may be divided into two groups and one group and the other group may be separately separated. It may be swingable.

The track support mechanism for a crawler type vehicle according to the present invention includes a track roller supporting the crawler,
A swing arm that supports the track roller so as to be vertically swingable about a swing axis; and a first restricting member that defines a swing limit of the swing arm in the vertical direction. This swing arm has a vehicle-side arm piece connected to the vehicle frame side via an elastic expansion / contraction member,
A roller-side arm piece that supports the track roller and can swing downward with respect to the vehicle-side arm piece, and a roller-side arm piece that can swing downward with respect to the vehicle-side arm piece. A configuration including a second regulation member that regulates the range is adopted.

With this structure, when the swing arm reaches the lower swing limit, the first swing member restricts the lower swing. However, the arm piece on the track roller side that constitutes the swing arm can swing further downward relative to the arm piece on the vehicle frame side. Therefore, even if the crawler fits into a depression or the like that exceeds the swing limit of the swing arm, the roller-side arm piece supporting the track roller can follow it and swing downward. The track roller will not come off the crawler.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an example in which the present invention is applied to a track roller supporting mechanism of the crawler type vehicle shown in FIG. In this example, each track roller 11, 12
Are supported by supporting mechanisms 30 and 50 having the same structure. Therefore, in the following, the track roller 11
The support mechanism 30 on one side will be described, and the support mechanism 50 on the other side will be described.
Is omitted.

The support mechanism 30 of this embodiment has a swing arm 31 which can be vertically swung about the swing shaft 15. The swing arm 31 includes a roller side arm 32.
And a body frame side arm 42. The roller-side arm 32 is composed of a pair of left and right arm plates 34, 35, and a roller shaft 36 spanned between the tips of these.
A track roller 11 is rotatably attached to the roller via a bearing 37. These arm plates 34,
The base end side of 35 is provided with a bearing (not shown) through the swing shaft 15
It is mounted in a freely rotatable state with respect to.

On the other hand, the body frame side arm 42 is formed of a single plate, and the base end of the arm 42 is rotatable with respect to the swing shaft 15 via a bearing (not shown). Installed. A spring receiver 43 is attached to the tip of the arm 42. A spring bearing 44 is also attached to the body frame 8 side, and the coil spring 21 is bridged between this and the spring bearing 43 on the arm 42 side.

Here, at the base end of the roller side arm 32,
The stop plate 39 is fixed, and the stop plate 39 is fixed so as to extend in the same direction as the body frame side arm 42. When the arm 32 swings up and down about the swing shaft 15, the stop plate 39 rotates together with the stop plate 39 about the swing shaft 15. On the other hand, the body frame side arm 42
A front stop plate 45 and a rear stop plate 46 are fixed to the front and rear of the base end portion on the side of. Stop plate 39 of the roller side arm
Are these front and rear stop plates 45, 4
Located between 6 In this example, the roller side arm 32
In the swinging position where is substantially perpendicular to the body frame side arm 42, the stop plate 39 thereof hits the rear stop plate 46 of the body frame side arm 42,
Above that, it cannot swing upward.

As described above, the support mechanism 50 for the inner track roller 12 has the same structure. However, in this example, the swing arm of each support mechanism is configured to swing independently and independently about the swing shaft 15.

The operation of the track roller support mechanisms 30 and 50 of the present embodiment thus constructed will be described.

First, as shown in FIG. 3, it is assumed that the inner track roller 12 side rides on a protrusion S such as a large stone on the traveling road surface G. In this case, the crawler 2 is inclined so that the inner side thereof faces upward. Following the inclination of the crawler 2, the inner track roller 12 hitting the crawler 2 swings upward. Here, in the present example, the swing arm supporting the inner track roller 12 and the swing arm 31 supporting the outer track roller are attached to the swing shaft 15 so as to be swingable separately. ing. Therefore, unlike the conventional support mechanism shown in FIG. 5, the outer track roller 11 does not swing so much upward, and maintains the state of being in contact with the back surface of the crawler 2. Therefore, in this case, the outer track roller 11
Can be prevented from leaving the crawler 2.

Next, the operation of the swing arm 31 when it is fitted in the recess exceeding the swing limit will be described. Roller-side arm 3 that constitutes the swing arm 31 of this example
2 and the body frame side arm 42 move up and down as a unit in a normal swinging state. That is, since the body-body-frame-side arm 42 is pulled by the coil spring 21, a torque that rotates downward about the swing shaft 15 acts. On the other hand, the roller side arm 3
Since the upward force is applied from the side of the crawler 2 to the crawler 2, the upward rotational torque about the swing shaft 15 acts. Therefore, the stop plate 39 is always pressed against the rear stop plate 46 with a predetermined pressing force, so that the arms 32, 42 on both sides are stopped.
Integrally swings up and down about the swing shaft 15.

However, when the crawler 2 is fitted into a large recess or the like and falls below the downward swing limit of the track roller 11 and is dropped downward, it is pressed from the crawler 2 side to the arm 32 side. The force stops working. As a result,
As shown in FIG. 4, the arm 32 can swing downward about the swing shaft 15 separately from the other arm 42. Therefore, as shown in this figure, the track roller 11 supported by the arc 42 does not swing downward while following the claw 2 and separate from it. It should be noted that such independent swinging of the arm 32 downward is possible until the stop plate 39 contacts the front stopper plate 45.

[0024]

As described above, the track roller support mechanism of the present invention has a structure in which the track rollers arranged side by side inside and outside can be vertically swung separately and independently. There is. Therefore, even when one side rides on a protrusion or the like, the other roller can be held while supporting the back surface of the crawler, so that the roller can be prevented from coming off the back surface of the crawler.

Further, in the present invention, after the swing arm swings downward and reaches its limit, only the roller side arm constituting the swing arm is further swung downward by a constant amount. The structure that can be used is adopted. Therefore, if the crawler falls into a deep depression,
It is possible to prevent the track roller from coming off from there.

[Brief description of drawings]

FIG. 1 is a side view showing a crawler type vehicle to which the present invention can be applied.

FIG. 2 is a diagram showing a track roller support mechanism according to an embodiment of the present invention, (A) is a schematic partial plan view thereof,
(B) is a schematic partial side view thereof.

3A and 3B are explanatory views for showing the operation of the support mechanism of FIG.

FIG. 4 is an explanatory view showing the operation of the support mechanism of FIG.

FIG. 5 is an explanatory view showing a problem to be solved in the conventional track roller support mechanism.

FIG. 6 is an explanatory diagram showing a problem to be solved in a conventional track roller support mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Crawler type vehicle 2, 3 ... Crawler 8 ... Body frame 11, 12 ... Track roller 15 ... Oscillation shaft 21 ... Coil spring 22, 23 ... Stopper 30, 50 ... Track roller support mechanism 31 ... Swing arm 32 ... Roller side arm 39 ... Stop plate 42 ... Vehicle frame side arm 45, 46 ... Stop plate

Claims (3)

[Claims] 1. A first and a second track roller arranged in the width direction to support the crawler, a first swing arm rotatably supporting the first track roller, and a second track. A second swing arm that rotatably supports the roller and a swing shaft that defines the swing center of these swing arms are provided, and the first and second swing arms are mutually A track roller support mechanism for a crawler type vehicle, wherein the track roller support mechanism is attached to a swing shaft in an independently rotatable state. 2. The first and second parts according to claim 1.
Each of the swing arms has a first restricting member that defines an upper and lower swing limit of the swing arm, and each swing arm has a vehicle-side arm piece connected to the vehicle frame side via an elastic expansion / contraction member, A roller-side arm piece that supports the track roller and can swing downward with respect to the vehicle-side arm piece, and a roller-side arm piece that can swing downward with respect to the vehicle-side arm piece. A track roller support mechanism comprising: a second restricting member that restricts a range. 3. A track roller that supports the crawler, a swing arm that supports the track roller so as to be vertically swingable about a swing shaft, and a vertical swing limit of the swing arm. This swing arm has a vehicle-side arm piece connected to the vehicle frame side via an elastic expansion / contraction member and a track roller, and also has a first regulation member. A roller-side arm piece that can be swung downward with respect to the arm piece, and a second restricting member that restricts a range in which the roller-side arm piece can be swung downward with respect to the vehicle-side arm piece. A track roller support mechanism for a crawler type vehicle, which is characterized by being provided.