JPH0441136A - Assembly of suspension for car - Google Patents

Abstract

PURPOSE:To efficiently assemble a suspension by installing a mount block on the upper edge part of a piston rod protruded upward from the upper surface of a spring upper seat and releasing pressure of the spring upper seat after a nut is screwed. CONSTITUTION:In the state where a piston rod 31 is contracted, a bump stopper 34 and coil spring upper seat 21 are set on a damper main body 7. Next, a coil spring 10 is contracted by pressurizing the spring upper seat 21 downward, so that the head edge part of the piston rod 31 is projected upward from the upper surface of the spring upper seat 21. A mount bracket 36 is fitted on the head edge part of this projected piston rod 31, and after a nut is screwed 37, pressure of the spring upper seat 21 is released.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of assembling a strut type suspension for a vehicle.

(Prior art) A strut-type automobile suspension consists of a cylindrical damper (shock absorber) body with a piston rod with a threaded tip protruding from one end in a telescopic manner, and a spring lower seat fixed to the outer periphery of the intermediate portion. , a spring upper seat and a mount block that are fastened to the tip of the piston rod with a nut, a coil spring that is compressed between the spring upper seat and the spring lower seat and surrounds the damper body, and the shortest compression dimension of the piston rod. In order to define this, a rubber bump stopper or the like is fitted onto the tip of the piston rod in contact with the lower surface of the spring upper seat.

Conventionally, the assembly of such a strut type suspension has been carried out in accordance with the procedure described below, as disclosed in, for example, Japanese Utility Model Publication No. 12788/1983.

That is, first, a bump stopper is fitted to the upper end of the piston rod which is in the contracted state, and then the piston rod is pulled upward while pressing the upper end surface of the bump stopper, and as a result of this pulling out, the base of the spring rod which is in the maximum extension state is The piston rod is held at maximum extension by the sliding resistance of the fitted bump stopper against the piston rod, and then the coil spring in the free state is placed on the spring lower seat from above, and this coil spring is slightly compressed to tighten the piston rod. The tip of the piston rod is made to protrude from the upper end of the coil spring, a spring upper seat and a mount block are attached to the tip of the piston rod, a nut is screwed on, and then the pressure on the coil spring is released. Next, the coil spring is recompressed until the upper end of the bump stopper contacts the lower surface of the spring upper seat, thereby engaging the bump stopper with the upper end of the piston rod, and then the coil spring is released from compression to complete the assembly. It is set to be completed.

As is clear from the above explanation, the conventional assembly method
After pulling up the piston rod and assembling the mount block, the coil spring must be recompressed in order to engage the bump stopper with the upper end of the piston rod. The structure is complicated because a means for pulling up the piston rod is required, and it takes time and effort to assemble.

(Objective of the Invention) Therefore, it is an object of the present invention to provide a method for assembling a vehicle suspension that can be efficiently assembled by omitting the recompression work that is performed after the piston rod is pulled up and the mount block is assembled.

(Structure of the Invention) The assembly method according to the present invention includes setting a bump stopper, a coil spring, and a spring upper seat on the damper body with the piston rod contracted, and then pressing the spring upper seat downward. The coil spring is compressed to cause the tip of the piston rod to protrude upward from the upper surface of the spring upper seat, and after fitting the mount block to the tip of the protruding piston rod and screwing the nut, the spring upper seat is removed. The feature is that the pressure is released.

(Effects of the Invention) According to the present invention, there is no need to pull up the piston rod, and if the pressure on the spring upper seat is released after assembling the mount block, the piston rod will also expand as the coil spring expands. However, at this time, the piston rod extends with the damper stopper attached to its tip, so there is no need to recompress the coil spring, which makes it possible to assemble the suspension efficiently and to improve the configuration of the assembly device. It has the effect of making it easier.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

A suspension assembly apparatus applied to the implementation of the present invention is shown in FIGS. 1 and 2, and this assembly apparatus includes:
The main components are a pedestal 1, a damper body holder jig 2, a damper body clamping means 3, and a coil spring compression jig 4.

The pedestal 1 is provided at the lower end of a support 6 erected on a base 5 so as to protrude from the front. A damper body holder 2 for holding the damper body 7 in a vertical position is provided on the pedestal 1, but this holder 2 is fixed to the damper body 7 as shown in FIG. The lower seat seat 9 is provided with a U-shaped planar shape with a recess 9a formed on the upper surface on which the spring lower seat 8 is seated. Generally, the spring lower seat 8 is a sheet metal source with relatively low precision,
In some cases, the angle at which the damper is attached to the damper body 7 is out of alignment. There is a risk of uneven hitting.

Therefore, the lower seat seat 9 is supported on the base 1 via a floating mechanism, and this floating mechanism includes a member 11 that has a spherical bottom surface 11a and is fitted onto the lower surface of the lower seat seat 9. and a member 12 fixed on the pedestal 1 with a recess 12a for accommodating this member 11.
and arranged in three recesses 13 (only one recess 13 is shown in FIG. 2) formed at predetermined equal intervals on the upper surface of the recess 12a of this member 12. steel ball 14
and a spring 15 that urges the steel ball 14 upward. Therefore, normally, the lower seat seat 9 is supported by three spring-biased steel balls 14 and held in a floating state, and when the coil spring 10 is compressed by the coil spring compression jig 4, the member 11 compresses the coil spring 15 and the member 12
It is configured to sit on top.

The damper body clamping means 3 is horizontally swingably supported on the pedestal 1 and includes a pair of clamp arms 16 for clamping the damper body 7, and a clamp cylinder 17 for driving the clamp arms 16. 1
The clamp arm 16 opens and closes as the piston rod 18 of No. 7 expands and contracts. Clamp arm 16
A jig 19 for phasing the damper body 7 is provided below.

The coil spring compression jig 4, as shown in FIG.
A movable base 20 is provided above the damper main body holder 3 so as to be movable up and down along the pillar 6, an upper seat holder 22 is attached to the upper surface of the spring upper seat 21 of the damper, and this upper seat holder It is constituted by a pair of opening/closing arms 23 that are supported by the movable base 20 so as to be horizontally rotatable in close contact with the lower surface of the tool 22. The movable base 20 is
It is provided on the front surface of the column 6 so as to be slidable in the vertical direction by engagement between a guide rail 24 provided along the column 6 and a guide pawl 25, and a lifting cylinder operated by air or the like is provided at the upper end of the column. The lower end of the piston rod 27 of 26 is connected to the joint 28 [.

are connected.

As shown in FIG. 2, the upper seat support 22 has an inclined surface 22a and a circumferential wall 22b on its lower surface, which are engaged with the inclined spring upper seat 21, and a pair of opening/closing arms 23 have a third opening/closing arm 23. As is clear from the figure, it is attached to the movable base 20 by a pin 29 so as to be horizontally rotatable, and is driven to open and close by an opening and closing cylinder 30.

This opening/closing arm 23 is connected to the coil spring 10 of the damper.
The spring upper seat 21 placed on the coil spring 10 is centered by holding the outer periphery of the spring upper seat 21 .

Next, the suspension assembly method of the present invention will be explained with reference to FIGS. 4 to 7 as well as an explanation of the operation of the above-mentioned assembly apparatus.

First, the spring lower seat 8 fixed to the damper body 7 is placed on the lower seat seat 9 of the pedestal 1, and after phasing the damper body 7 using the phasing jig 19, the damper body 7 is clamped. Clamp by arm 16. In this case, as shown in FIG. 4, the piston rod 31 of the damper is in a contracted state due to its own weight. The piston rod 31 has a threaded portion 3 formed at its tip.
It has a short intermediate portion 31b with a slightly larger diameter adjacent to 1a, and a longer main body portion 31c below this intermediate portion 31b has an even larger diameter.

Next, the cylindrical bump stopper 34 is inserted into the piston rod 31 and placed on the upper end surface of the damper body 7. The inner diameter of the upper end of the bump stopper 34 is smaller than other parts, and forms an engaging part 34a for the piston rod 31. When no external force is applied to the damper stopper 34, the engaging part 34a is smaller than the other parts. The inner diameter of the piston rod 34a is approximately equal to the outer diameter of the intermediate portion 31b of the piston rod 31.

Next, place the coil spring 10 on the spring lower seat 8.
Further, a spring upper sheet 21 is placed on the upper end of the coil spring 10.

At this time, the axis 32 of the spring upper seat 21 is eccentric with respect to the axis 33 of the piston rod 31.

Next, with the opening/closing arm 23 open, the lifting cylinder 26 is driven to lower the movable base 20, and the movable base 20 is temporarily stopped at the position where the upper seat support 22 is slightly above the spring upper seat 21. At the same time, the opening/closing cylinder 3o is driven to close the opening/closing arm 23 and hold the coil spring 10. By this operation of the opening/closing arm 23, the spring upper seat 21 is centered as shown in FIG. 5, and its axis 32 coincides with the axis 33 of the piston rod 31.

Next, the lifting cylinder 26 is driven again to lower the movable base 20. As the movable platform 20 descends, the coil spring 10 is pressed by the spring upper seat 21 and compressed. And the intermediate portion 31b of the piston rod 31
The movable base 20 is stopped at a position where the coil spring 10 is fully compressed until it slightly protrudes from the upper end of the spring upper seat 21. At this time, the bump stopper 34 is also compressed between the lower surface of the spring upper seat 21 and the upper end surface of the damper body 7. Next, insert the washer 35 and mount bracket 36 into the piston rod 31 (sixth
), the total compression of the coil spring 10 at this time is such that when the washer 35 and the mount bracket 36 are inserted into the piston rod 31, the threaded portion 31a of the washer 35 and the mount bracket 36 are slightly upwardly from the top surface of the mount bracket 36 (the nut seating surface). It is sufficient to make a stroke that protrudes and allows the nut 37 to be screwed on.

Next, the nut 37 is screwed onto the threaded portion 31a of the piston rod 31 protruding from the upper surface of the mount bracket 36.

When the nut 37 is rotated, the piston rod 31 is extended upward, but at this time, the bump stopper 34 is further compressed between the lower surface of the spring upper seat 21 and the upper end surface of the damper body 7. , the engaging portion 34a of the bump stopper 84 is engaged with the lower portion of the intermediate portion 31b of the piston rod 31, resulting in the state shown in FIG. Although not shown, the threaded portion 31a of the piston rod 31 has a slot for preventing rotation, and the piston rod insertion hole of the mount bracket 36 has a cross-sectional shape similar to that of the threaded portion 31a. By fixing the mount bracket 36, the piston rod 31 is prevented from rotating around its axis, allowing the nut 37 to be screwed into the piston rod 31.

After the assembly of each element is completed as described above, the movable base 20 is raised by driving the lifting cylinder 26 upward. As the movable base 20 rises, the spring upper seat 2
1 is released, the coil spring 10 does not extend the piston rod 31, but instead extends into the state shown in FIG. 7. At this time,
The bump stopper 34 is in close contact with the lower surface of the spring upper seat 21 and is elastically engaged with the piston rod 31 by its engagement portion 34a. It rises together with the piston rod 31 while remaining in close contact with the lower surface of the seat 21, completing the suspension assembly.

In the present invention, by adopting the above-described assembly method, the work of pulling up the piston rod 31 and the work of recompressing the coil spring 10 for engaging the bump stopper 34 to the upper end of the piston rod 31 are not necessary.
This has the effect that efficient suspension assembly can be achieved and the configuration of the assembly apparatus can be simplified.

[Brief explanation of drawings]

Fig. 1 is a side view of a suspension assembly device applied to the implementation of the present invention, Fig. 2 is a vertical cross-sectional view of its main parts, Fig. 3 is a bottom view of a coil spring compression jig, and Figs. 4 to 7. The figures are explanatory diagrams illustrating the suspension assembly method according to the present invention step by step. 1... cradle 2... damper body holder jig 3... damper body clamping means 4... coil spring compression jig 7... damper body 8... spring lower seat 9... lower seat holder Seat 10...Coil spring 16...Clamp arm 20...Movable stand 21...Spring upper seat 2...Upper seat support 3...Opening/closing arm...Damper piston rod 4...・Bump stopper 6...Mount bracket 7...Nut

Claims (1)

[Claims] A damper body is fixed, in which a piston rod with a threaded portion formed at the tip extensibly protrudes from the upper end and a spring lower seat is fixed to the outer periphery, and a bump stopper is attached to the damper body with the piston rod contracted. ,
setting a coil spring and a spring upper seat, and then compressing the coil spring by pressing the spring upper seat downward, causing the tip of the piston rod to protrude upward from the upper surface of the spring upper seat; A method for assembling a vehicle suspension, characterized in that a mount block is attached to the upper end of the protruding piston rod, and after a nut is screwed, the pressure on the spring upper seat is released.