JPS6246550Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention is mainly used in the assembly production line of vehicles (automobiles) to improve coil springs for independent suspension type rear suspensions, such as full trailing and semi-trailing suspensions. This invention relates to a coil spring compression device for compressing a shock absorber when assembling the shock absorber.

[Prior art]

As schematically shown in FIG. 1, this type of suspension has a structure in which a suspension arm is provided between a frame 11 of a vehicle 10 and a rear axle (suspension arm) 13 rotatably fixed to the frame 11 by a shaft 12. A coil spring 14 is interposed and a shock absorber 15 is installed. When assembling the shock absorber 15 of this suspension, especially the suspension of the vehicle 10 in which the frame 11 is separated from the body 16, as shown in FIG. Currently, the axle 13 is pushed down against the coil spring 14 by the hydraulic cylinder 20 of the push-down device 19 movably suspended from the rail 18 above the conveyor 17. It is. In this way, when the coil spring 14 is compressed by the push-down device 19,
Support for the rail 18 on the ceiling for hanging the push-down device 19, push-down device 19 for the rail 18
support structure, such as support for, and push-down device 19
The conveyor 17 receives a pressing force on the axle 13 of
It is necessary to make the structure of the assembly sturdy, which leads to an increase in the size of the entire assembly device on the production line, including the push-down device 19, and as a result, freedom in arranging other tools may be impaired. Furthermore, the heavy push-down device 19, which is mainly composed of the cylinder 20, moves above the worker's head, which is dangerous for the worker.

[Purpose of invention]

Therefore, the purpose of this invention is to simplify and downsize the device for compressing suspension coil springs in view of the above-mentioned conventional drawbacks, and to simplify and downsize the device for compressing suspension coil springs. It is an object of the present invention to provide a coil spring compression device which can be simplified, can be easily moved, and can improve safety for workers.

[Structure of the idea]

In order to achieve the above-mentioned purpose, this invention is based on the following: a locking member that can be hung on the frame and axle of a vehicle is disposed at both ends of the actuating cylinder, a pneumatic pipe is connected to the extension side port of the actuating cylinder, and A hydraulic line is connected to the shortening side port of the same operating cylinder, and a control circuit is constructed from a pneumatic circuit that applies air pressure to the pneumatic line based on an air source, and an air-hydro booster that converts the air pressure in that circuit into hydraulic pressure. The gist of this invention is to enable the extension operation by pneumatic pressure and the contraction operation by hydraulic pressure of the operating cylinder.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 3 to 8. 3rd showing working cylinder
In the figure and FIG. 4, the actuating cylinder 21 is
A fluid pressure cylinder is used in which a piston rod 23 that protrudes above the cylinder tube 22 expands and contracts by changing its protrusion length. An upper fastening member 25 is disposed at the upper end of the holder. The operating cylinder 21, lower engaging member 24, and upper engaging member 25 will be described in detail below.

The cylinder tube 22 of the working cylinder 21 is
It has an extension side port 26 and has a screw 2 on the outside of the lower part.
7 and the lower tube 2
8, a connecting tube 31 having a shortened side port 30 and screwed to the upper end of the intermediate tube 29, and an upper tube 32 screwed to the upper end of the connecting tube 31. (see Figure 7). The cylinder tube 22 has a piston rod 23 connected to the connecting tube 3.
1 and is slidably inserted in a guided state. Piston 3 of piston rod 23
3 is slidable inside the intermediate tube 29, and divides the inside of the tube 29 into an extension side chamber 34 communicating with the extension side port 26 and a contraction side chamber 35 communicating with the contraction side port 30. The piston rod 23 is also guided by a guide bush 36 fitted within the upper tube 32. A stopper bolt 38 having a hexagonal hole 37 at its lower end (the right end in FIG. 7) is screwed into the lower tube 28, and by screwing the bolt 38 forward and backward, the telescopic stroke of the piston rod 23 can be adjusted. Furthermore, the lower tube 28
Inside has a hexagonal hole 39 and a stopper bolt 3.
8 lock nuts 40 are screwed together. In addition, in FIG. 7, 41 indicates a seal.

A pneumatic line 42 of a control circuit A, which will be described in detail later, is connected to the extension side port 26 of the above-mentioned working cylinder 21, and a hydraulic line 43 of the control circuit A is connected to the contraction side port 30 of the same cylinder 21. has been done. Further, a manual valve 72 that forms part of the control circuit A is attached to the cylinder tube 22.

The lower engagement member 24 disposed at the lower end of the cylinder tube 22 is attached to the male thread 2 of the lower tube 28.
Upper and lower fixing nuts 44, 45 are screwed into the attachment 47, and a bifurcated portion 48 of an attachment 47 is rotatably fixed to a mounting base 46 supported between the nuts 44, 45 with a pin 49. The attachment 47 is provided with an engagement pin 50 that projects laterally, and the engagement pin 50 can be engaged in an engagement hole 51 formed in the frame 11 of the vehicle.

An upper engaging member 25 disposed at the upper end of the cylinder tube 22 is attached to a substantially U-shaped bracket 54 screwed onto the upper end of the piston rod 23.
5 is rotatably attached with a pin 56 (6th
(see figure). The hook 55 can be hooked onto the end of the axle 13 of the vehicle. A ball joint 59 consisting of a convex spherical bush 57 and a concave spherical bush 58 is interposed between the hook 55 and the pin 56.
By allowing the hook 55 to tilt when the coil spring is compressed, the load on the pin 56 is equalized. In FIG. 6, 60 is a lock nut that is screwed onto the piston rod 23 to lock the bracket 54, and 62 is a retaining plate that is attached to the bracket 54 by a bolt 61 to prevent the pin 56 from coming out.

Note that the upper tube 3 of the cylinder tube 22
2 and the bracket 54, a bellows-shaped extensible rubber boot 63 is mounted via clamps 64 and 65. Also, cylinder tube 2
A Z-shaped hanging bracket 66 is fixed to the upper tube 32 of 2, and can be hung on a tool stand in a factory or a hanging hook (not shown) installed on the ceiling through a hole 66a. There is.

Next, the control circuit A for operating the above-mentioned operating cylinder 21 will be explained in detail with reference to FIG. As shown, when the actuating cylinder 21 is in the extended state, air from the air source 67 is supplied to the pneumatic line 42 via the manual valve 72 from a pneumatic circuit 71 including a check valve 68, a filter 69, and a pressure control valve 70. At the same time, it is sent from the pneumatic circuit 71 to the lower chamber 76 of the air-hydro booster 75 via the switching valve 73 and the first variable throttle valve 74.
sent to. The upper chamber 77 of the air-hydro booster 75 is communicated with a muffler 79 via a second variable throttle valve 78 and the switching valve 73. A hydraulic chamber 80 of the air-hydro booster 75 is communicated with the hydraulic conduit 43 through a hydraulic circuit 81. In addition, in Fig. 8, 82 and 83 are check valves;
4 indicates an oil tank, and 85 indicates a pressure gauge.

When the manual valve 72 of the control circuit A is switched from the state shown in FIG. 8, the switching valve 73 is switched by the air from the manual valve 72, and the air from the air source 67 is
3. It is sent to the upper chamber 77 of the air-hydro booster 75 through the second variable throttle valve 78. Then, the piston 86 of the air-hydro booster 75
is moved downward, causing the hydraulic oil in the hydraulic chamber 80 to flow into the contraction side chamber 35 of the working cylinder 21. That is, the shortening of the actuating cylinder 21 is performed using hydraulic pressure converted from air pressure by the air-hydro booster 75. At this time, the air in the lower chamber 76 of the air-hydro booster 75 is exhausted from the silencer 79 through the first variable throttle valve 74 and the switching valve 73, and the air in the extension chamber 34 of the operating cylinder 21 is exhausted through the manual valve 72. It is discharged to the outside. From now on, the working cylinder 2
1, by returning the manual valve 72, air is sent to the extension side chamber 34 of the working cylinder 21, the cylinder 34 is extended, and the hydraulic oil in the contraction side chamber 35 is released from the hydraulic circuit 81. Return to the hydraulic chamber 80 of the air-hydro booster 75. That is, the operating cylinder 21 is operated to extend by pneumatic pressure, and to contract by hydraulic pressure.

Note that the pneumatic pipe line 42 and the hydraulic pipe line 43 are
Formed by a flexible hose, the operating cylinder 2
1 is now available for handheld use.

In the coil spring compression device having the above configuration, in order to assemble the shock absorber of the suspension, first,
The engagement pin 50 of the lower engagement member 24 is inserted into the engagement hole 51 of the
while engaging the hook 5 of the upper engaging member 25.
5 to the axle 13. Next, when the manual valve 72 is switched and the operating cylinder 21 is shortened, the coil spring between the frame 11 and the axle 13 is compressed (see FIG. 5). In this state, after assembling the shock absorber, the manual valve 72 is returned to its original position, the operating cylinder 21 is extended, the hook 55 is removed from the axle 13, and the engagement pin 50 is removed from the frame 11.
Completed the shock absorber assembly work.

[Effect of idea]

In other words, according to this invention, by extending the operating cylinder using pneumatic pressure and retracting it using hydraulic pressure converted from air pressure, it is possible to obtain a large force from hydraulic pressure only when compressing the coil spring of the suspension. This eliminates the need for the normally used large-capacity hydraulic unit, making it possible to create a simple and compact device based on an air-hydro booster that is smaller than the hydraulic unit, and the actuating cylinder can be hand-held. It can be made into any size and weight possible. This makes it possible to simplify the entire assembly-related equipment on the production line, making it easier (and freer) to move it, and improving safety by eliminating equipment that would be placed over workers' heads. .

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the vehicle suspension;
Fig. 2 is a schematic side view showing a conventional coil spring compression operation, Figs. Figure 4 is a right side view of the same, Figure 5 is a front view of the operating cylinder when it is shortened, Figure 6 is an enlarged sectional view of the upper engagement member, Figure 7 is an enlarged sectional view of the operating cylinder, and Figure 8 is the control. It is a circuit diagram. DESCRIPTION OF SYMBOLS 10... Vehicle, 11... Frame, 13... Axle, 14... Coil spring, 21... Operating cylinder, 24, 25... Engaging member, 26...
Extension side port, 30... Shortening side port, 42...
Pneumatic pipe line, 43...Hydraulic pipe line, 67...Air source, 71...Pneumatic circuit, 81...Hydraulic circuit, A
...control circuit.

Claims (1)

[Scope of utility model registration request] Attachment members that can be hung on the vehicle frame and axle are arranged at both ends of the actuating cylinder, and a pneumatic pipe line is connected to the extension side port of the actuating cylinder, and a hydraulic line is connected to the contraction side port of the same actuating cylinder. The control circuit consists of a pneumatic circuit that is connected to the pneumatic pipeline to apply air pressure to the pneumatic pipe from an air source, and an air-hydro booster that converts the air pressure in that circuit into hydraulic pressure. A coil spring compression device for a suspension, which is characterized by being able to perform a shortening operation.