JPH081187Y2 - Crawler wrapping shape changing device for crawler type carrier - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial applications]

The present invention relates to a crawler-wrapping shape changing device for a crawler-type carrier that can smoothly travel regardless of the shape of the road surface.

[0002]

[Prior art]

Since the crawler type traveling device has a large ground contact area and a low ground contact pressure, it can travel on unusual road surfaces, for example, on obstacles such as stairs. However, in order to further improve this running performance, the crawler is wrapped. Japanese Patent Publication No. 63-19391 shows that the shape of a triangle formed by three wheels can be changed according to the type of obstacle.

[0003]

However, in the above-mentioned prior art example, the arm supporting the wheel that swings freely is free, and it is necessary to change the shape to the optimum shape by its own gravity depending on the shape of the traveling road surface. It has become. For this reason, there is a certain time lag until the optimum shape is obtained, and during this time the running capacity may decrease. Rather, the slope of the road, such as stairs,
If the shape is fixed over a certain section, it is better to change the shape quickly and forcibly when you start climbing the stairs.

This invention solves such a problem, and the point is that the lower side of the crawler wound between the center running wheel and the drive wheels and idler wheels arranged in front of and behind it. The bending angle around the center running wheel can be changed and fixed at any angle.

[0005]

[Means for Solving the Problems]

Under the above problems, the present invention has a drive shaft mounted on a track frame pivotally movably up and down (in a vertical plane) on a support shaft supporting a center travel wheel, and the travel wheels are operated by the operation of a hydraulic cylinder. The point at which the lower side of the crawler wound between the front and rear drive wheels and idler wheels can be changed and fixed at any angle below 180 ° centering on the center running wheel. It is a feature.

[0006]

【Example】

1 to 3 are a side view, a plan view and a front view of a crawler type carrier for exclusive use of cylindrical objects showing an embodiment of the present invention, the center of a chassis frame 3 on which an engine 1 and a mission 2 are mounted. A running wheel 5 is loosely fitted to a support shaft 4 that projects toward both sides near the center of gravity and is forcibly driven by the power of the engine 1, and an idle wheel 6 is attached to the upper rear position of the running wheel 5. Two left and right track frames 7 which are rotatable in a vertical plane about the support shaft 4 are forwardly extended and pivotally attached to the support shaft 4.
Drive wheels 8 are attached to the track frame 7. In addition,
In the track frame 7, a chain wheel 10 fixed to a support shaft 4 connected by a chain 9 and a chain wheel 11 connected to a drive wheel 8
And to transmit the power of the support shaft 4 to the drive wheels 8. On the other hand, a hydraulic cylinder 12 is provided between the truck frame 7 and the chassis frame 3 so that the drive wheel 8 can be rotated up and down about the support shaft 4 by expansion and contraction of the hydraulic cylinder 12. The hydraulic cylinders 12 may be provided respectively on the left and right track frames 7 as shown in the figure, but the left and right track frames 7 are connected by a connecting rod (not shown), and one hydraulic cylinder is linked to this. It may be. The crawler 13 is wound around the driving wheel 8, the traveling wheel 5 and the idle wheel 6 described above. The crawler 13 wound in this way is the idle wheel 6
Is on the upper rear side of the traveling wheel 5, the lower side portion between the traveling wheel 5 and the drive wheel 8 serves as a ground contact portion. At this time, it is preferable that the traveling wheel 5 has a large diameter such that there is a slight gap between the upper surface of the crawler 13 and the traveling wheel 5 because the contact area of the traveling wheel 5 becomes large. In addition, a support wheel 14 is appropriately installed between the traveling wheel 5, the drive wheel 8 and the idle wheel 6.

A handle 15 extends upward from the rear end of the chassis frame 3, and a handle lever 15 is provided with a clutch lever 16 and a gear shift lever 17 for connecting and disconnecting the power in the mission 2. A posture changing lever 18 for operating the hydraulic cylinder 12 is also provided below the handle 15. When the posture changing lever 18 is operated, the directional control valve is switched to obtain the expansion / contraction amount of the hydraulic cylinder 12 according to the operation amount. However, these are based on conventionally known means. Will be omitted. A carrier frame 19 is installed above the chassis frame 3 in an upwardly slanted manner, and a cylindrical object (hereinafter referred to as a cargo) 20 is placed thereon. The carrier frame 19 is provided on the chassis frame 3 and is independent of the truck frame 7 (the posture of the carrier frame 19 does not change even if the truck frame 7 is rotated).

Since the load 20 to be loaded on the carrier has a long and thin cylindrical shape such as a gas cylinder, it has a catch mechanism for surely catching it and dropping it on the carrier frame 19. The catch mechanism is actuated by a hydraulic cylinder 21 interposed between the undercarriage frame 3 and an attitude of standing up around a horizontal shaft 22 that is laterally mounted on the front part of the undercarriage frame 3 (at substantially the same position as the drive wheels 8). It comprises a rotating frame 23 that rotates to a posture in which the cargo frame 19 is laid down, and a catch arm 24 that is provided on the rotating frame 23 to grip and release the load 20. Rotating frame 23 and catch arm
The operation of 24 is a catch lever 25 that extends backward near the handle 15.
When the catch lever 25 is operated up and down, the rotating frame 23 is undulated, and when the catch lever 24 is operated left and right, the catch arm 24 is opened and closed. The opening and closing of the catch arm 24 is linked to the catch lever 25 and operated by a cam or the like.
Although the details of the opening / closing mechanism 26 are not directly related to the gist of the present invention, the description thereof will be omitted here.

When the load 20 is grasped by the catch arm 24, the rotating frame 23 is laid down on the carrier frame 19 and travels to a desired position. At this time, the traveling wheels 5, 5 are moved according to the shape of the traveling road surface or the like.
The winding shape of the crawler 13 wound around the drive wheel 8 and the idle wheel 6 is changed. That is, when traveling on a flat ground, the lower side of the crawler 13 wound between the traveling wheel 5 and the idler wheel 6 and the crawler 13 wound between the traveling wheel 5 and the drive wheel 8.
If the angle with the lower side is set to a bent angle of 180 ° or less, the ground contact length of the crawler 13 is shortened, and the running and steering characteristics are improved. On the other hand, when going up and down a slope or stairs, the lower side of the crawler 13 wound between the running wheel 5 and the idler wheel 6 and the crawler 13 wound between the running wheel 5 and the drive wheel 8.
If the lower side of the crawler 13 is set to 180 ° and the lower side of the crawler 13 is set to a straight line, the absolute posture of the cargo frame 19 with respect to the ground does not change, and the posture of the load 20 is stable. In particular, if this angle is set when ascending and descending the stairs, the number of edges of the stairs in contact with the crawler 13 increases, and stable traveling can be performed.

[0010]

[Effect of device]

As described above, since the present invention has been described above, the following effects can be expected. i) The lower side of the crawler wound around the driving wheels and the idler wheels around the running wheel can be changed and fixed to any angle within a fixed angle range (α) from a straight line of 180 °. It can be optimally adapted according to the shape of any road surface such as flat ground, slopes, stairs or obstacles. At this time, since the position of the drive wheel that sets the bending angle of the lower side of the crawler is changed by the hydraulic cylinder, the operation is quick. ii) Since the running wheels are near the center of gravity of the center of the vehicle body, lowering the handle during turning lifts the drive wheels, and only the tread surface of the running wheels comes into contact with the ground, improving turning performance. Further, since the traveling wheels have a large diameter, the ground contact pressure can be kept low, the role of the carrier roller is also achieved, and the vibration of the crawler is small.

[Brief description of drawings]

FIG. 1 is a side view of a crawler type carrier according to an embodiment of the present invention.

FIG. 2 is a plan view of a crawler type carrier according to an embodiment of the present invention.

FIG. 3 is a front view of a crawler type carrier showing an embodiment of the present invention.

[Explanation of symbols]

 3 ... Chassis frame 4 ... Support shaft 5 ... Running wheel 6 ... Idler wheel 7 ... Truck frame 8 ... Drive wheel 12 ... Hydraulic cylinder 13 ... Crawler 18 ... Posture change lever

Claims (1)

[Scope of utility model registration request] 1. A driving wheel (8) and an idle wheel (6) are arranged in front of and behind the running wheel (5), and the drive wheel (8), the running wheel (5) and the idle wheel (6) are crawler (13). ) In a triangular shape, a hydraulic cylinder (12) interposed between the support shaft (4) of the running wheel (5) and the chassis frame (3) expands and lowers. A pivotable track frame (7) is pivotally attached to the track frame (7), the drive wheel (8) is attached to the track frame (7), and the hydraulic cylinder (12) is expanded and contracted by operating a posture changing lever (18). ，
A crawler-type carrier that can be fixed by changing the bending angle around the traveling wheel (5) on the lower side of the crawler (13) to any angle within a fixed angle range of 180 ° or less. Crawler wrapping shape changing device.