JP2021154418A - Method for assembling coil spring, and jig for assembling coil spring - Google Patents

Abstract

To prevent a coil spring from collapsing at the time of assembling a shock absorber at a low cost with a simple configuration regardless of the type of the coil spring to reliably assemble the coil spring to the shock absorber.SOLUTION: A jig 10 for assembling a coil spring 5 to a shock absorber 1 includes a mounting portion 11 which can be mounted on an upper end of a rod 2 of the shock absorber 1, a shaft portion 12 which has the mounting portion 11 at one end and to which an upper spring seat 6 can be fitted, and a weight member 13 which can press the upper spring seat 6 fitted to the shaft portion 12 toward the mounting portion 11 side in a state that the mounting portion 11 is mounted to the upper end of the rod 2. The weight member 13 is configured to be slidable in an axial direction with respect to the shaft portion 12.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for assembling a coil spring and a jig for assembling the coil spring, and more particularly to a technique for assembling the coil spring coaxially with a shock absorber.

For example, in an assembly line of a strut suspension among automobile suspensions, a step of assembling a coil spring, which is also a component of the suspension, to a shock absorber, which is a component of the suspension, is carried out.

For example, Patent Document 1 describes an example of a method of assembling a coil spring to a shock absorber. In the assembly method described in this patent document, first, a coil spring in a no-load state is placed on a lower spring seat (flange) of a shock absorber positioned so as to face in the vertical direction. At this time, the upper end of the coil spring is located further above the upper end of the piston rod. In this state, the claw is engaged with the coil spring in the axial direction, the claw is pushed down relatively, and the coil spring is compressed until the upper end of the coil is located below the upper end of the piston rod. , Place the upper support assembly including the upper spring seat on the upper end of the piston rod, and fix it to the piston rod with a nut. By the above procedure, the coil spring compressed to a predetermined length is assembled to the shock absorber while being sandwiched between the lower spring seat and the upper spring seat (Patent Document 1). (See FIG. 7 and the like).

Further, in Patent Document 1, a guide portion having a guide surface extending in the vertical direction is arranged on the side portion of the coil spring in the compressed state to guide the coil spring to extend in the vertical direction when the claw is pulled out. It is described that the coil spring is prevented from falling down (a situation in which the coil spring is detached from the upper spring seat) by guiding the coil spring (see FIG. 1 and the like in Patent Document 1).

Japanese Unexamined Patent Publication No. 2001-62750

By the way, this type of suspension includes not only coil springs having different length dimensions, outer diameter dimensions, pitches, etc. according to the required characteristics of the vehicle, but also coil springs with uneven pitches and coils asymmetrical around the central axis. Various types of coil springs may be used, such as springs (eccentric coil springs) and coil springs that change the outer diameter such as barrel shape. In such a case, if the guide portion is arranged as described in Patent Document 1 to prevent the coil spring from collapsing during assembly, the radial position of the guide portion as well as the claw is determined according to the type of the coil spring. Since it is necessary to make fine adjustments each time, additional equipment such as a servomotor for driving the claws and guides with high accuracy is required, which leads to an increase in equipment cost.

In view of the above circumstances, in the present specification, regardless of the type of coil spring, the coil spring can be reliably assembled to the shock absorber by preventing the coil spring from collapsing at low cost when assembling the shock absorber with a simple configuration. Making it possible to attach is a technical issue to be solved.

The solution to the above problems is achieved by the method of assembling the coil spring according to the present invention. That is, this assembling method is a method for assembling the coil spring to the shock absorber, and the step of mounting the coil spring on the lower spring seat attached to the shock absorber and the weight member can be slidable. In the process of preparing the provided coil spring assembly jig and with the upper spring seat interposed between the weight member and the coil spring, attach the assembly jig to the upper end of the rod of the shock absorber. In the process of pressing the coil spring in the direction of compressing by sliding due to the weight of the weight member, and in the state of pressing in the direction of compressing the coil spring, the upper spring seat and the lower spring seat are brought close to each other to push the coil spring. It is characterized by having a step of compressing to a predetermined size.

As described above, in the coil spring assembling method according to the present invention, an assembling jig in which the weight member is slidably provided is prepared, and the upper spring seat is interposed between the weight member and the coil spring. In this state, an assembly jig was attached to the upper end of the rod of the shock absorber so that the coil spring was pressed in the direction of compression by sliding due to the weight of the weight member. In this way, the assembly jig provided with the weight member slidable is attached to the upper end of the rod, and the coil spring is pressed by the slide by the weight of the weight member, so that the weight of the weight member is used to utilize the weight of the upper spring. The seat can be strongly pressed against the coil spring. As a result, the spring can be automatically pressed in the compression direction when the above-mentioned assembly jig is attached to the upper end of the rod. Therefore, the coil spring is placed on the lower spring seat before the coil spring. The inclination of the coil spring until the start of compression can be suppressed, and the situation where the spring comes off from the upper spring seat can be prevented as much as possible. Therefore, the coil spring and the upper spring seat can be assembled to the shock absorber at appropriate positions and postures, respectively. In addition, since it is sufficient to prepare an assembly jig in which the weight member is slidable, the configuration is simpler than, for example, finely adjusting the coil spring holding member (claw, etc.) with a servomotor or the like. It is possible to take measures to prevent the coil spring from collapsing at low cost.

Further, the solution of the above problems is also achieved by the coil spring assembling jig according to the present invention. That is, this assembling jig is a jig used when assembling a coil spring to a shock absorber, and has a mounting portion that can be mounted on the upper end of the rod of the shock absorber and an upper spring seat that has a mounting portion at one end. The weight member is provided with a shaft portion capable of fitting the shaft portion and a weight member capable of pressing the upper spring seat fitted to the shaft portion toward the mounting portion side with the mounting portion mounted on the upper end of the rod. Is characterized by a point that is slidable in the axial direction with respect to the shaft portion.

As described above, the coil spring assembling jig according to the present invention is configured to be mountable on the upper end of the rod of the shock absorber, and the shaft portion into which the upper spring seat can be fitted and the mounting portion are mounted on the upper end of the rod. The upper spring seat fitted to the shaft portion is provided with a weight member that can be pressed toward the mounting portion, and the weight member can be slid in the axial direction with respect to the shaft portion. bottom. By using the assembling jig having the above configuration, for example, when the assembling jig with the upper spring seat fitted to the shaft is attached to the upper end of the rod of the shock absorber, the weight member slides due to its own weight. Presses the upper spring seat toward the coil spring. Therefore, the weight of the weight member can be used to strongly press the upper spring seat against the coil spring. As a result, the spring can be automatically pressed in the compression direction when the above-mentioned assembly jig is attached to the upper end of the rod. Therefore, the coil spring is placed on the lower spring seat before the coil spring. The inclination of the coil spring until the start of compression can be suppressed, and the situation where the spring comes off from the upper spring seat can be prevented as much as possible. Therefore, the coil spring and the upper spring seat can be assembled to the shock absorber at appropriate positions and postures, respectively. Further, if the weight member is a slideable assembling jig, the coil has a simpler configuration and is less costly than the case where the holding member (claw, etc.) of the coil spring is finely adjusted by, for example, a servomotor. It is possible to take measures to prevent the spring from collapsing.

As described above, according to the present invention, regardless of the type of coil spring, the coil spring can be reliably shock-absorbed by preventing the coil spring from collapsing at low cost when assembling to the shock absorber with a simple configuration. It becomes possible to assemble to.

It is a front view of the jig for assembling the coil spring which concerns on one Embodiment of this invention. It is a top view of the assembling jig shown in FIG. It is a figure for demonstrating an example of the assembling method of the coil spring using the assembling jig shown in FIG. 1, and is the figure which shows the state which put the coil spring on the lower spring seat. It is a figure for demonstrating an example of the assembling method of the coil spring using the assembling jig shown in FIG. 1, and is the figure which shows the state which attached the assembling jig of FIG. be. It is a figure for demonstrating an example of the assembling method of a coil spring using the assembling jig shown in FIG. 1, and is the figure which shows the state which compressed the coil spring by bringing both spring seats close to each other. It is a figure for demonstrating an example of the assembling method of the coil spring using the assembling jig shown in FIG. 1, and is the figure which shows the state which removed the assembling jig in the state which compressed the coil spring.

Hereinafter, the method of assembling the coil spring and the contents of the jig for assembling the coil spring according to the embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the overall configuration of the coil spring assembling jig 10 according to the embodiment of the present invention. This assembly jig 10 is used when assembling a coil spring to a shock absorber constituting a vehicle suspension such as a strut type, and is used at the upper end of a rod 2 of the shock absorber 1 (both see FIG. 3). A shaft with a mountable mounting portion 11 and a shaft portion 12 having the mounting portion 11 at one end and capable of fitting the upper spring seat 6 (see FIG. 4) and the mounting portion 11 attached to the upper end of the rod 2. A weight member 13 capable of pressing the upper spring seat 6 fitted to the portion 12 toward the mounting portion 11 is provided.

In the present embodiment, the mounting portion 11 is composed of a fitting recess 11a that fits with the fitting convex portion 2a provided at the upper end of the rod 2. Further, in a state where the fitting recess 11a is fitted to the fitting convex portion 2a and the mounting portion 11 is attached to the upper end of the rod 2, the center line X1 of the assembling jig 10 and the center line X2 of the rod 2 are parallel to each other. (Preferably matches). Further, the axial dimension t1 of the fitting recess 11a is larger than the axial dimension t2 of the fitting convex portion 2a. Therefore, in the state where the fitting recess 11a is fitted to the fitting convex portion 2a, the mounting portion 11 and the rod 2 are in contact with each other without a gap in the axial direction (see FIG. 4 described later).

The shaft portion 12 has a mounting portion 11 at one end thereof. Further, the outer diameter dimension d1 of the shaft portion 12 including the mounting portion 11 is constant, and is set to the same size as the outer diameter dimension d2 of the rod 2. As will be described later, when the through elongated hole 14 is formed in the shaft portion 12 as in the present embodiment, the outer diameter dimension d1 is constant at least in the axial region from the mounting portion 11 to the through elongated hole 14. Is preferable.

The weight member 13 is configured to be slidable in the longitudinal direction of the shaft portion 12. In the present embodiment, the weight member 13 is composed of one or more annular weights (three annular weights 15 in this illustrated example), and the one or more annular weights 15 can be fitted to the shaft portion 12. Has been done. Further, a through hole 16 penetrating in the radial direction is formed in the annular weight 15, and a through elongated hole 14 extending in the axial direction is formed in the shaft portion 12, and these through hole 16 and the through elongated hole 14 are formed. By inserting a bolt 17 or the like into the shaft portion 12, the annular weight 15 can slide in the axial direction with respect to the shaft portion 12.

The shape of the lower surface of the annular weight 15 is arbitrary, but as will be described later, it covers the entire circumference with the upper spring seat 6 (in this embodiment, the thrust bearing 7 fixed to the upper end of the upper spring seat 6) to be abutted. It is preferable to set the shape of the lower surface of the annular weight 15 so that it can be brought into contact with the weight.

Next, an example of the method of assembling the coil spring 5 to the shock absorber 1 using the assembling jig 10 having the above configuration will be described mainly with reference to FIGS. 3 to 6.

First, as shown in FIG. 3, the shock absorber 1 to be assembled is positioned and held in a posture in which the center line X2 is oriented in the vertical direction. At this time, the cylinder 3 is held by the holding portion 20, and the rod 2 is in a posture of protruding upward. Further, a lower spring seat 4 is attached to a predetermined position in the axial direction on the outer circumference of the cylinder 3. With the shock absorber 1 positioned and held in this way, the coil spring 5 in the no-load state is placed on the lower spring seat 4 attached to the outer periphery of the cylinder 3. In this state, the upper end position of the coil spring 5 is higher than the fitting convex portion 2a at the upper end of the rod 2 (see FIG. 3). Although not shown, a spring insulator may be attached to the upper end of the coil spring 5 at this point.

After the coil spring 5 is placed on the lower spring seat 4 in this way, the assembling jig 10 is attached to the upper end of the rod 2 (here, the fitting convex portion 2a). Here, the mounting portion 11 of the assembling jig 10 in which the upper spring seat 6 (upper spring seat 6 having the thrust bearing 7 integrally in the illustrated example) is fitted to the shaft portion 12 is attached to the upper end of the rod 2. Install (see Figure 4). As a result, the upper spring seat 6 comes into contact with the upper end of the coil spring 5, and the upper spring seat 6 is pushed downward by the slide due to the weight of the weight member 13, and the coil spring 5 in contact with the upper spring seat 6 is compressed. Pressed in the direction. In this state, the length dimension L1 of the coil spring 5 is shorter than the length dimension (free length) L0 of the coil spring 5 in the no-load state. Further, the elastic restoring force corresponding to the reduced amount L0-L1 of the coil spring 5 and the weights of the upper spring seat 6 and the weight member 13 are in a balanced state. In this way, the weight of the weight member 13 acts on the coil spring 5 via the upper spring seat 6, so that the coil spring 5 is separated from the upper spring seat 6 and is not easily tilted.

After that, as shown in FIG. 5, the upper spring seat 6 is brought closer to the lower spring seat 4, the upper spring seat 6 is moved to a predetermined position in the axial direction on the outer periphery of the rod 2, and the coil spring 5 is assembled. It is compressed to the time dimension (length dimension L2 shown in FIG. 5). In the present embodiment, the upper spring seat 6 is clamped by one or a plurality of clamp portions 30 to restrict the axial movement of the upper spring seat 6, and the shock absorber 1 is raised together with the holding portion 20 to raise the upper spring. The seat 6 is brought close to the lower spring seat 4, and the upper spring seat 6 is transferred from the outer periphery of the shaft portion 12 of the assembling jig 10 to the outer periphery of the rod 2 of the shock absorber 1. At this time, as in the present embodiment, the outer diameter dimension d1 of the shaft portion 12 and the outer diameter dimension d2 of the rod 2 are made the same, and the mounting portion 11 and the rod 2 are brought into contact with each other without a gap in the axial direction. The upper spring seat 6 is smoothly transferred from the outer circumference of the shaft portion 12 to the outer circumference of the rod 2 described above.

After moving the upper spring seat 6 to a predetermined position in the axial direction on the outer circumference of the rod 2 as described above, the assembling jig 10 is removed from the upper end of the rod 2. As shown in FIG. 5, the assembling jig 10 is removed while the holding portion 20 and the clamp portion 30 hold the shock absorber 1 and the upper spring seat 6. As a result, the upper end of the rod 2 is exposed. Therefore, an upper support (not shown) is placed on the upper end of the rod 2, and a nut is tightened on the upper end of the rod 2 with a nut runner. As a result, the upper support is fixed to the rod 2, and the coil spring 5 and the upper spring seat 6 are fixed to the shock absorber 1 in the state shown in FIG. As described above, the assembly of the coil spring 5 to the shock absorber 1 is completed.

As described above, according to the method of assembling the coil spring 5 according to the present embodiment, the assembling jig 10 in which the weight member 13 is slidably provided is prepared, and the upper spring seat 6 is combined with the weight member 13. Attach the assembly jig 10 to the upper end of the rod 2 of the shock absorber 1 with the coil spring 5 interposed therebetween, and press the coil spring 5 in the direction of compression by sliding the weight member 13 by its own weight. I made it. In this way, the weight of the weight member 13 is weighted by attaching the assembling jig 10 provided so that the weight member 13 is slidable to the upper end of the rod 2 and pressing the coil spring 5 by sliding the weight member 13 by its own weight. The upper spring seat 6 can be strongly pressed against the coil spring 5 by using the above. As a result, the coil spring 5 can be automatically pressed when the above-mentioned assembly jig 10 is attached to the upper end of the rod 2, so that the coil spring 5 is placed on the lower spring seat 4. It is possible to suppress the tilt of the coil spring 5 until the compression of the coil spring 5 is started, and prevent the coil spring 5 from coming off from the upper spring seat 6 as much as possible. Therefore, the coil spring 5 and the upper spring seat 6 can be assembled to the shock absorber 1 at appropriate positions and postures, respectively. Further, since it is sufficient to prepare the assembling jig 10 in which the weight member 13 is slidably provided, it is simpler than the case where the holding member (claw or the like) of the coil spring 5 is finely adjusted by, for example, a servomotor or the like. It is possible to take measures to prevent the coil spring 5 from collapsing at low cost with such a configuration.

Further, as in the present embodiment, the weight member 13 is composed of an annular weight 15 that fits into the shaft portion 12, and each annular weight 15 can slide in the axial direction in cooperation with the through slot 14 and the bolt 17. With the configuration, for example, by simply changing the number of annular weights 15 according to the specifications (length, pitch, etc.) and characteristics (spring constant, etc.) of the coil spring 5, a load of an appropriate size is applied to the coil spring 5. Can act. Therefore, it is possible to easily and at low cost for various types of coil springs 5.

Although one embodiment of the present invention has been described above, the coil spring assembling method and the coil spring assembling jig according to the present invention shall have a configuration other than the above as long as the purpose is not deviated. Is also possible.

For example, regarding the slide mechanism of the weight member 13, in the above embodiment, the shaft portion 12 is provided with a through elongated hole 14, the annular weight 15 forming the weight member 13 is provided with a through hole 16 penetrating in the radial direction, and the through elongated hole is provided. The bolt 17 is inserted into the through hole 16 and the through hole 16, and the annular weight 15 slides along the longitudinal direction of the through elongated hole 14, that is, the longitudinal direction of the shaft portion 12, by the cooperation of the bolt 17 and the through elongated hole 14. In addition, the movement of the through slot 14 below the lower end can be restricted, but of course, the annular weight 15 can be slidably configured within a predetermined range by other configurations. For example, although not shown, a member that is axially engaged with a member connected to the annular weight 15 is provided on the outer periphery of the shaft portion 12 and above the position where the weight member 13 and the upper spring seat 6 can be brought into contact with each other. By providing the annular weight 15, it is possible to restrict the sliding of the annular weight 15 downward from the predetermined position. In short, it is possible to define the slidable range of the annular weight 15 without providing the through elongated hole 14 and the through hole 16.

Of course, the weight member 13 is not limited to the annular weight 15 that fits into the shaft portion 12. A weight member as long as it can be attached to the upper end of the rod 2 together with the assembling jig 10 and the upper spring seat 6 mounted on the upper end of the coil spring 5 can be pressed downward by its own weight while being attached to the upper end of the rod 2. 13 can have any configuration.

Further, in the above embodiment, the shock absorber 1 and the lower spring seat 4 are raised by raising the holding portion 20 while the upper spring seat 6 is held at a predetermined position in the vertical direction by the clamp portion 30. The case where the upper spring seat 6 is brought close to the lower spring seat 4 has been illustrated, but of course, the case is not limited to this. For example, in the state shown in FIG. 4, the upper spring seat 6 is lowered together with the clamp portion 30 while the holding portion 20 is held at a predetermined position in the vertical direction, that is, the shock absorber 1 and the lower spring seat 4 are held. Thereby, both spring seats 6 and 4 may be brought close to each other.

1 Shock absorber 2 Rod 2a Fitting convex part 3 Cylinder 4 Lower spring seat 5 Coil spring 6 Upper spring seat 7 Thrust bearing 10 Assembling jig 11 Mounting part 11a Fitting recess 12 Shaft part 13 Weight member 14 Through slot 15 Annular weight 16 Through hole 17 Bolt 20 Holding part 30 Clamp part

Claims (2)

It is a method for assembling a coil spring to a shock absorber.
The process of mounting the coil spring on the lower spring seat attached to the shock absorber, and
The process of preparing a jig for assembling the coil spring provided with a slidable weight member, and
With the upper spring seat interposed between the weight member and the coil spring, the assembly jig is attached to the upper end of the rod of the shock absorber, and the coil spring is slid by the weight of the weight member. The process of pressing in the direction of compression and
A set of coil springs comprising a step of bringing the upper spring seat and the lower spring seat closer to each other in a state of pressing the coil spring in a compression direction to compress the coil spring to a predetermined size. How to attach. A jig used when assembling a coil spring to a shock absorber.
A mounting part that can be mounted on the upper end of the shock absorber rod,
A shaft portion having the mounting portion at one end and capable of fitting the upper spring seat, and a shaft portion.
With the mounting portion mounted on the upper end of the rod, the upper spring seat fitted to the shaft portion is provided with a weight member capable of pressing the upper spring seat toward the mounting portion, and the weight member is the shaft. A jig for assembling a coil spring that is configured to be slidable in the axial direction with respect to the part.

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