JPH09207833A - Height adjusting device for crawler type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a height adjusting device capable of adjusting the height of a car-body of a crawler type vehicle, and preventing the bottom part of the car-body from being struck against the ground surface, or running on the ground surface during the period of operation. SOLUTION: A height adjusting device is provided with a hydraulic cylinder 3 as an example of a raising and lowering means for raising and lowering a support member 2 provided on a truck frame 1, and a guide member 4 for guiding the support member 2 provided on the truck frame 1 to raise and lower the support member vertically. An expansion rod is expanded by the hydraulic cylinder 3 to move the support member which is supporting the car body while it is guided by the guide means 4, upward in horizontal position, and thus to raise the car-body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adjusting a vehicle height in a crawler-type construction machine or other vehicles by elevating a vehicle body by elevating means such as a hydraulic cylinder.

[0002]

2. Description of the Related Art In general, a suspension system for a crawler vehicle is provided in a pair on the left and right, and a track frame having an idler and a sprocket axially supported back and forth and a crawler belt mounted on the track frame. And a support member for supporting the vehicle body. That is, the support member has a structure in which the vehicle body 70 is directly fixed to the center thereof, or the vehicle body 70 is rotatably supported via a slewing bearing.
Then, conventionally, as shown in FIGS. 2 to 3, the support member 52 supporting the vehicle body 70 and the track frame 51 are
They are fastened and fixed to each other by bolts 60. Here, reference numeral 61 is an idler, 62 is a lower roller, and 63 is an upper roller. However, according to the conventional configuration, since the support member 52 is integrated with the track frame 51, the vehicle body 70 supported by the support member 52 is
Since the minimum ground height from the ground contact surface is constant, depending on the shape of the ground at the work site, there is a risk of hitting the bottom of the vehicle body on the ground or riding on the ground during work.

[0003]

The present invention was devised in view of the above circumstances, and its main problem is to make it possible to adjust the height of a support member in the vertical direction, thereby making it possible to adjust the height of the vehicle body from the ground contact surface. An object of the present invention is to provide a vehicle height adjusting device of a crawler type vehicle whose height can be adjusted.

[0004]

In order to solve this problem, according to the invention of claim 1, a pair of left and right track frames are provided, and an end portion of the track frame is suspended between the pair of track frames. A vehicle height adjusting device for a crawler vehicle comprising a support member connected to a frame and a vehicle body supported by the support member, wherein the track frame and the support member are separated from each other, and both end portions of the support member are separated. A technical means is provided in which an elevating means for vertically moving the truck in parallel with the truck frame is provided. Further, in the invention of claim 2, the lifting means comprises a fluid pressure cylinder, and one of the expandable end and the fixed end is attached to the track frame, and the other is attached to the end of the support member. Are taking appropriate measures. Further, in the invention of claim 3, a technical means is provided in which a guide means for guiding the support member to move vertically is provided. Furthermore, in the invention of claim 4, the guide means is composed of a rod standing upright on the track frame, and a ring fixed to the support member and slidably fitted to the rod. Taking technical measures.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment in which the vehicle height adjusting device for a crawler vehicle of the present invention is applied to a suspension device for a hydraulic excavator will be described below with reference to the drawings. In the vehicle height adjusting device for a crawler type construction machine shown in FIG. 1, a hydraulic cylinder 3 is used as an example of an elevating means provided on a track frame 1 to elevate and lower a support member 2. Further, a vertical direction of the support member 2 provided on the track frame 1 is used. And a guide means 4 for guiding to move up and down.

Here, the track frame 1 has idlers (idling wheels) and sprockets (driving wheels) axially supported at both front and rear ends thereof, and is guided by an upper roller provided at an upper portion at a midway position and a lower roller provided at a lower portion. The endless crawler belt is stretched along the outer periphery and is provided in a pair of left and right, but only one part of one is shown in the figure. The support member 2 is hung and connected to the pair of left and right track frames.

In this embodiment, the support members 2 have a beam-like structure extending horizontally between the track frames 1 and 1 facing each other, and a pair of support members 2 are arranged in front and rear. Since the base of the swing bearing portion, which is the lower portion of the vehicle body, is integrally fixed to the upper center of the pair of support members, the vehicle body is rotatably supported via the swing bearing portion. . The support member 2 may be preliminarily formed integrally with the lower part of the vehicle body. In this case, each arm protruding in the left-right direction serves as a support member and its tip is connected to the track frame 1 or 1, respectively. It Further, in the case of a vehicle in which the vehicle body does not turn, the support member 2 may be directly connected to the lower portion of the vehicle body.

Next, the elevating means has a structure for vertically elevating and lowering the support member, and the hydraulic cylinder 3 as an example in this embodiment has an opening at the top of the track frame 1 having a box-shaped cross section. The cylinder part 5 fixed inside the installation part, the telescopic rod 6 provided so as to be slidable up and down in the cylinder part 5, and the base part of the telescopic rod 6 are integrally provided to vertically move the inside of the cylinder part 5. A partitioning operation part 6b is provided. The hydraulic cylinder 3 is provided with a pressure oil supply / discharge port (not shown) below the cylinder portion 5 for connection to the hydraulic system of the hydraulic excavator and an operation portion (not shown) provided in the operator's cab. Of the vehicle body and the support member 2 by supplying pressure oil to the cylinder portion 5 to raise the telescopic rod 6 steplessly through the operating portion 6b and releasing the pressure oil from the cylinder portion 5.
The retractable rod 6 is lowered by its own weight.

A push-up piece 6a is integrally provided on the upper end of the telescopic rod 6, and the push-up piece 6a may be fixed to the support member 2 or may be abutted against the support member 2 to be pushed up. But it's okay. In the illustrated example, the cylinder portion 5 is provided on the track frame 1 and the telescopic rod 6 is connected to the support member 2. However, conversely, the cylinder portion 5 is fixed to the support member 2 and the tip of the telescopic rod is attached to the track frame 1.
It may be fixed to the side.

In this embodiment, a total of four hydraulic cylinders 3 are provided at the left and right ends of the front and rear support members 2, respectively, and a total of four hydraulic cylinders are operated in the same manner in synchronization with the operation of the operating portion. To do. That is, when the pressure oil is evenly supplied to each cylinder portion 5, each telescopic rod 6 moves up at the same speed (distance), and the pair of front and rear support members 2 are moved up in parallel.

As a result, the vehicle body is smoothly displaced to the high position with respect to the track frame 1. In this embodiment, the guide means 4 is also used so that the support member 2 can be vertically moved. In this embodiment, as the guide means 4, a pair of screw rods 7 are provided upright on the upper portion of the track frame 1 toward both ends in the width direction, while the end portions of the support member 2 correspond to the screw rods 7 described above. A through hole 9 through which the screw rod can be inserted is formed.

That is, in the illustrated example, the support member 2 includes
A ring is integrally provided at the end to form a through hole 9 corresponding to the screw rod 7 near the outer end, and a through hole 9 corresponding to the other screw rod 7 is provided near the inner side of the bottom of the support member 2.
Is transparently installed. Therefore, the support member 2 is guided by the screw rod 7 and vertically slides vertically along the guide rod 7.
Further, since the adjusting nut is screwed on the upper end of the screw rod 7 so as to be able to move up and down, and the rising height of the support member 2 is regulated, the adjusting screw 8 is vertically moved along the screw rod 7. You can move around and set the maximum height of the car body.

In the above embodiment, the support member 2 in the ascended state is held by the hydraulic cylinder 3 as the ascending / descending means, but a spacer is provided to hold the gap between the lifted support member 2 and the track frame 1. Other configurations may be added. Further, although the hydraulic cylinder is provided as the lifting means in the above-described embodiment, the invention is not limited to this, and a link mechanism, a screw type jack or other lifting mechanism can be used.

Further, the guide means may be a guide rail or a guide bar, and the elevating means has a guide function. For example, one of the support member and the track frame is provided with a nut portion and the other is upright by a motor. It is also possible to provide such a screw and raise and lower the nut portion by rotating the screw rod. In short, the present invention is not limited to the above-mentioned embodiments, and various design changes can be made.

[0015]

According to the vehicle height adjusting device for a crawler-type construction machine of the present invention, the height of the vehicle body is adjusted by raising and lowering the vehicle body through the support member by the elevating means. You can Therefore, it is possible to prevent the vehicle body from hitting the bottom of the ground or riding on the ground during work.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a vehicle height adjusting device for a crawler type construction machine according to the present invention, (a) showing a state before ascending, and (b) showing a ascending completed state. is there.

FIG. 2 is a side view illustrating a related structure of a track frame and a support member of a conventional crawler track type construction machine.

FIG. 3 is a front view of the structure of the conventional crawler-type construction machine of FIG. 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Track frame 2 ... Support member 3 ... Hydraulic cylinder (elevating means) 4 ... Guide means 7 ... Screw rod (guide means) 8 ... Adjustment nut (guide means)

Claims (4)

[Claims] 1. A pair of left and right track frames, a support member that is hung between the pair of track frames and has an end connected to the track frame, and a vehicle body supported by the support members. A vehicle height adjusting device for a crawler vehicle, wherein the track frame and the support member are separated from each other, and an elevating means is provided for vertically moving the both ends of the support member in parallel with the track frame. A vehicle height adjusting device for a crawler vehicle, which is characterized in that 2. The elevating means comprises a fluid pressure cylinder, and one of its telescopic end or fixed end is attached to the track frame, and the other is attached to the end of the support member. 1. A vehicle height adjusting device for a crawler vehicle according to 1. 3. The vehicle height adjusting device for a crawler vehicle according to claim 1, further comprising guide means for guiding the support member so as to vertically move up and down. 4. The guide means is composed of a rod member provided upright on the track frame and a ring fixed to a support member and slidably fitted to the rod member. Item 3. A vehicle height adjusting device for a crawler vehicle according to Item 3.