JPH0735275U - Crawler type running body - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent rusting and damage of hydraulic cylinders for adjusting the crawler tension, reduce the number of cylinders, and simplify cylinder piping. A cylinder mounting portion 15 to which a hydraulic cylinder 14 can be detachably mounted is provided at a position facing a push rod 12 connected to a guide shaft 8, while a fixed pipe is provided to a car body as a part of the cylinder pipe. When adjusting the tension of the crawler, the hydraulic cylinder 14 is set on the cylinder mounting portion 15, the cylinder 14 and the fixed pipe are connected by a connection hose, and the hydraulic cylinder 14 and the connection hose can be removed after the tension adjustment.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a crawler type traveling body having an improved structure of a tension adjusting device for adjusting the tension of a crawler (crawler track).

[0002]

[Prior art]

 Conventionally, crawler-type traveling bodies used in crawler cranes and hydraulic excavators have crawler frames attached to the left and right sides of the car body on which the upper structure (in the case of cranes and hydraulic excavators) is mounted. The crawlers are suspended between driving wheels provided on one front and rear sides of both crawlers and a guide wheel provided on the other side.

In such a crawler type traveling body, as a crawler tension adjusting device, a push rod is connected to a guide shaft which is a rotation center shaft of a guide wheel, as shown in Japanese Utility Model Publication No. 1-81391. At the same time, a hydraulic cylinder is attached to the crawler frame so as to face the tip end surface of this push rod, and this hydraulic cylinder presses the push rod to move the guide wheel in the crawler length direction to adjust the crawler tension. I am taking it.

[0004]

[Problems to be solved by the device]

 However, according to this conventional technique, since the hydraulic cylinder is fixed to the crawler frame as a permanent installation, there are the following drawbacks.

The hydraulic cylinder is constantly exposed to mud and water and is in an environment where it is easy to come into contact with stones, etc. Moreover, the frequency of crawler tension adjustment (frequency of use of the hydraulic cylinder) is low, and long-term maintenance is required. Since it may not be received, rust and damage are likely to occur.

Separate hydraulic cylinders are required for both guide wheels. In particular, in the configuration using a pair of left and right hydraulic cylinders for one guide wheel as in the above-mentioned known technique, a total of four cylinders are required for two on each side, and the hydraulic piping for the traveling body increases accordingly. Equipment costs are high.

Therefore, the present invention provides a crawler-type traveling body that can prevent rusting and damage of a hydraulic cylinder that adjusts the tension of a crawler, reduce the number of cylinders, and simplify cylinder piping.

[0008]

[Means for Solving the Problems]

 According to the invention of claim 1, the crawler frames are attached to both left and right sides of the car body, and the crawler is provided between the drive wheels provided on one front and rear sides of the both crawler frames and the guide wheels provided on the other side. The push rod is suspended and is connected to the guide shaft that is the center of rotation of the guide wheel, and the push rod is pressed by the pressing means, whereby the guide wheel moves in the crawler length direction and the crawler tension is increased. In the crawler type traveling body configured to adjust the above, a cylinder mounting portion to which the hydraulic cylinder as the pressing means is detachably mounted is provided at a position facing the push rod in both the crawler frames. The cylinder mounting portion is provided with a reaction force receiving portion that receives a reaction force when the hydraulic cylinder is extended, and controls the hydraulic cylinder. As a hydraulic pipe for connecting to the hydraulic power source and the tank via the valve, a fixed pipe provided on the car body with one end connected to the hydraulic source and the tank and the other end facing the outside of the car body, A connection hose connecting the other end of the fixed pipe and the hydraulic cylinder is provided, and a detachable joint is provided at each of the connection parts of the connection hose and the fixed pipe and the hydraulic cylinder.

According to a second aspect of the present invention, in the configuration of the first aspect, the hydraulic cylinder is provided at a central portion in the width direction of both crawler frames, and the push rod is provided with a guide shaft through a pair of left and right connecting plates. And a window for attaching and detaching the hydraulic cylinder and the connection hose is provided on the side wall of the crawler frame.

[0010]

[Action]

 According to the above configuration, when adjusting the tension of the crawler, set the hydraulic cylinder on the cylinder mounting part of the crawler frame and connect the control valve with the cylinder and the fixed piping on the car body side connected with the connecting hose. By operating to the extension side, the hydraulic cylinder extends. As a result, the push rod is pressed, the guide wheel moves, and the tension of the crawler is adjusted.

After the adjustment, the hydraulic cylinder and the connection hose may be removed and stored in a good environment such as the tool room of the working machine.

Therefore, there is no risk of rusting of the hydraulic cylinder due to the influence of mud or water and damage to the cylinder due to contact with stones or the like.

Further, since one hydraulic cylinder and one connection hose can be shared by a plurality of adjustment points, the number of cylinders can be reduced and the cylinder piping can be simplified.

Further, according to the structure of claim 2, since the adjustment of the tension of one crawler can be performed by one hydraulic cylinder, the cost is low, the storage of the cylinder and the hose is convenient, and the adjustment work is performed. The efficiency of will be good.

[0015]

【Example】

 In FIG. 1, reference numeral 1 denotes a car body. Crawler frames 2 and 2 are attached to both left and right sides of the car body 1, and drive wheels 3 are provided on the rear side of the crawler frames 2 and 2, and are provided on the front side. The crawler 5 is suspended between the guide wheel 4 and the guide wheel 4.

6 is a swivel provided in the center of the car body 1, and 7 is a swivel joint for connecting the upper and lower pipes.

A tension adjusting device for the two-sided crawlers 5 and 5 will be described with reference to FIGS.

Connecting plates 9 and 9 are mounted rearward on both left and right sides of a guide shaft 8 serving as a rotation center axis of the guide wheel 4, and the connecting plates 9 and 9 are provided on inner surfaces of both left and right sides of the crawler frame 2. The upper and lower guide plates 10 and 11 are slidably supported in the front-rear direction.

Further, a T-shaped push rod 12 is connected to the rear ends of the two connecting plates 9 by bolts 13 ... And the rear end surface of the push rod 12 is pressed from the rear by the hydraulic cylinder 14. The guide wheel 4 moves forward to tension the crawler 5.

The hydraulic cylinder 14 is detachably attached to a cylinder attachment portion 15 provided at the center of the crawler width direction behind the push rod 12.

The cylinder mounting portion 15 includes a substrate 16 horizontally mounted in the crawler frame 2, a pair of front and rear cylinder support plates 17 and 17 vertically mounted on the substrate 16, and a rear side of the substrate 16. It is formed by the attached rear frame 18 as a reaction force receiving portion.

The hydraulic cylinder 14 has a substantially semicircular recess (see FIG. 4) 17 a provided in the center of both cylinder support plates 17 and 17 in a horizontal posture in which the piston rod 14 a closely faces the rear end surface of the push rod 12. , 17a are fitted into and supported by the rear frame 18.

At the rear end of the push rod 12, there is provided a semicircular guide piece 12a for guiding the piston rod 14a from below.

A downward U-shape is formed between the head portion 12 a of the push rod 12 and the shim receiving member 19 mounted inside the crawler frame 2 so as to face the push rod head portion 12 a. One or a plurality of shims 20 are fitted, and the load applied to the guide wheel 4 except when adjusting the tension is supported by the crawler frame 2 via the connecting plates 9, 9, the push rod 12, the shim 20, and the shim receiving member 19. .

A shim cover 21 is attached to the push rod 12 so as to cover the push rod 12 from above, and a spare shim 20 ′, which is added to the shim 20 as needed when adjusting the tension, is provided below the shim cover 21. It is fitted into the push rod 12.

On the other hand, FIGS. 1 and 5 show traveling body side hydraulic piping for connecting the hydraulic cylinder 14 to the hydraulic pump 22 and the tank 23 (see FIG. 5) as hydraulic sources mounted on the upper structure. Thus, the fixed pipes 24 and 25 are provided in the car body 1.

One end of each of the fixed pipes 24 and 25 is connected to the swivel joint 7, and the fixed pipes 24 and 25 are connected to the upper pipes 26 and 27 via the swivel joint 7.

Further, the upper pipes 26, 27 are provided with a control valve 28 for tension adjustment that controls expansion and contraction of the hydraulic cylinder 14. In FIG. 5, 29 is a relief valve.

On the other hand, the other ends of the fixed pipes 24 and 25 are led out to substantially the center of the front surface of the car body 1, and at the time of adjusting the tension, this lead-out end and the hydraulic cylinder 14 are connected via connection hoses 30 and 31. It

A window hole 32 is formed in the side plate on the hose introduction side (inside the machine) of the crawler frame 2 so that the connection and disconnection operations of the connection hoses 30 and 31 and the hydraulic cylinder 14 can be easily performed from the outside. It is provided.

Further, one-touch type quick couplers 33 ... Are provided at both ends of the connection hoses 30 and 31, the derivation ends of the fixed pipes 24 and 25, and the hydraulic cylinder 14, respectively, to adjust the tension. At this time, the connection and disconnection of the connection hoses 30 and 31, the fixed pipes 24 and 25, and the hydraulic cylinder 14 are performed by the quick coupler 33 ....

In this crawler type traveling body, the hydraulic cylinder 14 and the connection hoses 30 and 31 are stored and stored in an appropriate place such as a tool room of a machine or a tool box except when tension is adjusted.

When adjusting the tension, the hydraulic cylinder 14 is set on the cylinder mounting portion 15 of the crawler frame 2 as shown in each drawing, and the cylinder 15 and the fixed pipes 24, 25 are connected by the connection hoses 30, 31. To do.

In this state, by operating the control valve 28 to the extension side, the hydraulic cylinder 14 is extended and the push rod 12 is pushed forward, and the guide wheel 4 is moved forward to adjust the tension.

After the tension is adjusted, the shim 20 is supplemented according to the size of the gap formed between the push rod head 12a and the shim receiving member 19, and then the control valve 28 is operated to the reduction side to operate the hydraulic cylinder. It is sufficient to reduce 14 and remove the cylinder 14 and the connection hoses 30 and 31.

The tension adjustment is performed in order by replacing the pair of hydraulic crawlers 5 and 5 with the pair of hydraulic cylinders 14 and the connection hoses 30 and 31.

As described above, since the hydraulic cylinder 14 for tension adjustment can be removed from the crawl flame 2 and stored in a favorable environment except when tension adjustment is performed, the cylinder 14 can be used to remove mud or water. There is no risk of rusting due to influence or damage due to contact with stones.

Further, since the pair of hydraulic cylinders 14 and the connecting hoses 30, 31 can be shared for adjusting the tension of the two side crawlers 5, 5, the number of the cylinders 14 and the hoses 30, 31 can be reduced.

Furthermore, in this embodiment, since the adjustment of the tension of one crawler 5 can be performed by one hydraulic cylinder 14, the cost is low and it is convenient for storing the cylinder 14 and the hoses 30, 31. The adjustment work becomes efficient.

However, in the present invention, the tension adjustment of the two side crawlers 5 and 5 may be performed by two hydraulic cylinders, as in the known technique disclosed in Japanese Utility Model Laid-Open No. 1-81391. In this case, the ends of the connecting hoses 30 and 31 may be branched and connected to both cylinders.

[0041]

[Effect of device]

 As described above, according to the present invention, the cylinder mounting portion for detachably mounting the hydraulic cylinder is provided at a position facing the push rod connected to the induction shaft, while the hydraulic cylinder is connected to the hydraulic source via the control valve. As part of the hydraulic piping for connecting to the tank, a fixed piping is provided on the car body with one end connected to the hydraulic power source and the tank, and the other end led out to the outside of the car body to adjust the crawler tension. Since the hydraulic cylinder is set in the cylinder mounting part, the other end of the fixed pipe and the hydraulic cylinder are connected by a connecting hose, and the hydraulic cylinder and connecting hose can be removed after tension adjustment, except when adjusting the tension. , Hydraulic cylinders and connecting hoses can be stored in a good environment such as the tool room of working machines.

Therefore, there is no possibility that the hydraulic cylinder will be rusted due to the influence of mud or water or damaged due to contact with stones, etc., so that the cylinder life can be remarkably improved.

Further, since one hydraulic cylinder and one connection hose can be shared by a plurality of adjustment points, the number of cylinders can be reduced and the cylinder piping can be simplified.

Further, according to the invention of claim 2, since the adjustment of the tension of one crawler can be performed by one hydraulic cylinder, the cost is low, it is convenient for the storage of the cylinder and the hose, and the adjustment work is performed. The efficiency of will be good.

[Brief description of drawings]

FIG. 1 is a plan view of an entire traveling body showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a diagram showing a hydraulic circuit configuration of a hydraulic cylinder in the embodiment.

[Explanation of symbols]

1 Car body 2, 2 Both crawler frames 3 Drive wheel 4 Guide wheel 5 Crawler 8 Guide shaft 9 Connecting plate 10 Upper guide plate 11 which supports the connecting plate slidably 11 Lower guide plate 12 Push rod 14 Hydraulic cylinder 15 Cylinder mounting part 17 Cylinder Supporting Part of Cylinder Mounting Part 18 Rear Frame as Same Reaction Force Receiving Unit 22 Hydraulic Pump as Hydraulic Source 23 Tank 28 Control Valve 24, 25 Fixed Piping 30, 31 Connection Hose 33 Joint (Quick Coupler) 32 Window Hole

Claims (2)

[Scope of utility model registration request] 1. Crawler frames are attached to both left and right sides of a car body, and crawlers are suspended between a drive wheel provided on one front and rear sides of both crawler frames and a guide wheel provided on the other side. A push rod is connected to the guide shaft that is the center of rotation of the guide wheel, and the push rod is pressed by the pressing means, whereby the guide wheel moves in the crawler length direction and the tension of the crawler is adjusted. In the crawler type traveling body configured as described above, a cylinder mounting portion to which the hydraulic cylinder as the pressing means is detachably mounted is provided at a position facing the push rod in both the crawler frames, and the cylinder mounting portion is provided. Is provided with a reaction force receiving portion for receiving a reaction force when the hydraulic cylinder is extended, and the hydraulic cylinder is provided with a control valve. As a hydraulic pipe for connecting to the hydraulic power source and the tank via the fixed pipe provided on the car body with one end connected to the hydraulic power source and the tank and the other end facing the outside of the car body, and the fixed pipe. A connecting hose connecting the other end of the pipe and the hydraulic cylinder is provided,
A crawler-type traveling body, wherein detachable joints are respectively provided at connection portions of the connection hose, the fixed pipe, and the hydraulic cylinder. 2. The crawler-type traveling body according to claim 1, wherein a hydraulic cylinder is provided at a central portion in the width direction of both crawler frames, and push rods are provided on both sides of the guide shaft via a pair of left and right connecting plates. A crawler-type traveling body which is connected and has a hydraulic cylinder and a window hole for attaching and detaching a connecting hose provided on a side wall of the crawler frame.