JP2023144679A - Compression jig of coil spring and method using the same - Google Patents

Abstract

To prevent a coil spring from coming off in compression work of the coil spring.SOLUTION: A jig for compressing a coil spring disposed between a vehicle body and an arm which is swingably connected to the vehicle body is disclosed. The jig includes: a main shaft which is inserted into the coil spring and whose tip is engaged with one of the vehicle body and the arm; and a pressing mechanism which is provided so as to be movable along the main shaft and presses the other of the vehicle body and the arm from the opposite side of the coil spring.SELECTED DRAWING: Figure 2

Description

The technology disclosed herein relates to a jig for compressing a coil spring in vehicle manufacturing and a method using the jig.

Patent Document 1 describes a jig used for manufacturing vehicles. This jig is used to compress coil springs when assembling a suspension to a vehicle body. The coil spring is arranged between the vehicle body and the trailing arm. The jig has a rod-shaped main body that is suspended from the vehicle body using a wire. The operator connects the distal end of the jig suspended from the vehicle body to the trailing arm, and then pushes down the proximal end located on the opposite side. As a result, the main body of the jig swings on the principle of leverage, and its tip pushes the trailing arm upward while compressing the coil spring.

Japanese Patent Application Publication No. 2001-62749

With the above jig, when compressing the coil spring, there is a risk that the coil spring may fall out from between the vehicle body and the trailing arm. Such problems are not limited to springs for trailing arms, but can similarly occur when compressing coil springs disposed between the vehicle body and various arms (or links). This specification provides techniques for avoiding such coil spring dislodgement.

The technology disclosed in this specification is embodied in a jig for compressing a coil spring disposed between a vehicle body and an arm (also referred to as a link) that is swingably connected to the vehicle body. be converted into This jig includes a main shaft that is inserted into the inside of the coil spring and whose tip is locked to one of the vehicle body and the arm, and a main shaft that is movable along the main shaft. The vehicle includes a pressing mechanism that presses the other of the vehicle body and the arm from the side opposite to the spring.

In the above jig, the main shaft is inserted into the inside of the coil spring, and the tip thereof is locked to the vehicle body (or arm). Then, a pressing mechanism provided on the main shaft presses the arm (or the vehicle body) together with the coil spring from the base end side of the main shaft. According to this configuration, during the work of compressing the coil spring, the main shaft of the jig is placed inside the coil spring and receives the reaction force of the coil spring, so that it is strongly pressed against the vehicle body and the arm. Fixed. This prevents the coil spring from falling off between the vehicle body and the arm when the coil spring is compressed.

The configuration of a vehicle in which jigs 30, 130, and 230 of the embodiments are used is schematically shown. 3 shows a state in which the jig 30 of Example 1 is attached to a vehicle. The jig 30 of Example 1 is shown alone. The shape of the opening 23 of the upper sheet 22 is shown. The main parts of the jig 130 of Example 2 are shown. The main parts of the jig 230 of Example 2 are shown.

In one embodiment of the present technology, the pressing mechanism includes a sheet member that contacts the other of the vehicle body and the arm, and a seat member that contacts the seat member from a side opposite to the other of the vehicle body and the arm. , and a nut member screwed into a thread groove formed in the main shaft. According to such a configuration, the operator can move the nut portion toward the sheet member by rotating the nut portion. Further, it is also possible to prevent the seat member from being pushed back due to the reaction force of the coil spring. In addition, when an operator rotates a nut part, a power tool may be used, a hand tool without a power source may be used, or it is not necessary to use these tools. Note that the "seat" of the seat member herein does not mean its shape, but rather a "seat."

In the above embodiment, each of the contact surfaces of the sheet member and the nut member that contact each other may be curved in a spherical shape. With such a configuration, even if the nut rotates with respect to the main shaft or the attitude (angle) of the seat member with respect to the main shaft changes in response to swinging of the arm, there will be no damage between the seat member and the nut member. Surface contact can be maintained.

In the above embodiment, the jig may further include a crank handle that is connected to the nut member and rotated by the operator. According to such a configuration, an operator can rotate the nut member without using a power tool or a hand tool. That is, the coil spring can be compressed.

In the above embodiment, the sheet member may be provided with a grip for the operator to grip with the other hand when operating the crank handle with one hand. According to such a configuration, the operator can easily operate the crank handle.

In one embodiment of the present technology, the pressing mechanism includes a sheet member that contacts the other of the vehicle body and the arm, and a seat member that contacts the seat member from a side opposite to the other of the vehicle body and the arm. a stopper member that holds the seat member in position against the reaction force of the coil spring; and a stopper member that is swingably attached to the main shaft and that is swingably operated by an operator. and a lever member that presses the sheet member toward the sheet member. Even with such a configuration, the operator can compress the coil spring by swinging the lever member.

In one embodiment of the present technology, the coil spring may be a coil spring of a suspension that suspends an axle. In this case, although not particularly limited, the arm may be a trailing arm located forward of the axle. In this case, although not particularly limited, the suspension may be a torsion beam suspension in which a pair of left and right trailing arms are connected by a torsion beam. However, the technology disclosed in this specification is not limited to suspension springs, but can be similarly applied to jigs for compressing various coil springs assembled into a vehicle.

The jig 30 of Example 1 will be described with reference to the drawings. Here, the direction FR in the drawings indicates the front in the longitudinal direction of the vehicle, and the direction RR indicates the rear in the longitudinal direction of the vehicle. Direction UP indicates upward in the vertical direction of the vehicle, and direction DW indicates downward in the vertical direction of the vehicle. Direction LH indicates the left side in the left-right direction of the vehicle, and direction RH indicates the right side in the left-right direction of the vehicle. In this specification, the front FR, rear RR, upper UP, and lower DW of the vehicle may be simply referred to as the front, rear, left, right, upper, and lower, respectively.

The jig 30 of this embodiment is used for manufacturing vehicles. This jig 30 is used to compress the coil spring 20 when assembling the suspension to the vehicle body 12. As shown in FIG. 1, the coil spring 20 is arranged between the vehicle body 12 and the trailing arm 14. The vehicle body 12 is provided with an upper seat 22 that supports the upper end of the coil spring 20, and the trailing arm 14 is provided with a lower seat 24 that supports the lower end of the coil spring 20. The vehicle is provided with a pair of left and right trailing arms 14, and these trailing arms 14 are connected by a torsion beam 16. That is, the suspension in this embodiment is a torsion beam type suspension, although this is just one example.

The suspension is a device for suspending an axle, and includes a shock absorber 26 and a plurality of arms including the trailing arm 14 in addition to the coil spring 20. The trailing arm 14 extends forward from the axle, and is swingably connected to the vehicle body 12 at its front end. In the work of assembling the suspension, it is necessary to connect the lower end 26a of the shock absorber 26 to a predetermined connection position 14a of the trailing arm 14 (or an axle, etc. fixed thereto), and for this purpose, a jig 30 is used. Coil spring 20 is compressed.

As shown in FIGS. 2 and 3, the jig 30 includes a main shaft 40 and pressing mechanisms 50 and 60. The main shaft 40 is a rod-shaped member that extends linearly from its tip 40a to its base end 40b. The main shaft 40 is inserted into the coil spring 20 through an opening 25 formed in the lower seat 24. A tip 40a of the main shaft 40 is inserted into an opening 23 formed in the upper seat 22 and is locked to the upper seat 22 (that is, to the vehicle body 12). Although not particularly limited, the main shaft 40 can be made of metal, for example.

A locking pin 44 is provided at the tip 40a of the main shaft 40. The locking pin 44 is attached perpendicularly to the main shaft 40 and extends radially outward with respect to the main shaft 40. On the other hand, as shown in FIG. 4, a slit 23a having a shape corresponding to the locking pin 44 is formed in the opening 23 formed in the upper sheet 22. With such a configuration, the distal end 40a of the main shaft 40 can be locked to the upper seat 22 by rotating it, for example, 90 degrees after being inserted into the opening 23 of the upper seat 22. Note that the configuration described here is an example of a configuration in which the distal end 40a of the main shaft 40 is removably locked to the upper seat 22, and is not limited to this.

The main shaft 40 is provided with a thread groove 42 . The thread groove 42 is formed at least in a continuous length section from the base end 40b of the main shaft 40. Note that the thread groove 42 may be formed in a part of the length section of the main shaft 40, or may be formed over the entire length of the main shaft 40.

Returning to FIGS. 2 and 3, the pressing mechanisms 50 and 60 are provided movably along the main shaft 40, and press the trailing arm 14 from the side opposite to the coil spring 20. Although this is just an example, the pressing mechanisms 50 and 60 in this embodiment include a sheet member 50 and a nut member 60. The seat member 50 is a plate-shaped member, and contacts the trailing arm 14 (specifically, the lower seat 24 thereof) from below. A hole 52 through which the main shaft 40 passes is formed in the sheet member 50. The hole 52 of the sheet member 50 is sufficiently larger than the cross section of the main shaft 40 and does not engage with the thread groove 42. Therefore, the seat member 50 can freely move along the main shaft 40 and can freely swing relative to the main shaft 40. Although not particularly limited, the sheet member 50 can be made of metal, for example.

The nut member 60 is screwed into a thread groove 42 formed in the main shaft 40. The nut member 60 is located below the seat member 50 (that is, on the base end 40b side of the main shaft 40), and abuts the contact surface 54 of the seat member 50 from below. The nut member 60 mainly has a hexagonal columnar main body 62 and a head 64 located above the main body 62, and the head 64 is in contact with the sheet member 50. The head 64 has a spherical shape and fits into the hole 52 of the sheet member 50. The hole 52 of the sheet member 50 is provided with an abutting surface 54 that curves into a spherical shape to match the spherical shape of the head 64 of the nut member 60. In this way, when the contact surface 54 of the seat member 50 and the surface of the nut member 60 that contacts it are curved into a spherical shape, the nut member 60 cannot freely rotate with respect to the seat member 50. can. Further, the sheet member 50 can freely swing relative to the nut member 60.

As described above, in the jig 30 of this embodiment, the main shaft 40 is inserted into the inside of the coil spring 20, and its tip 40a is locked to the vehicle body 12. Then, the operator moves the nut member 60 toward the sheet member 50 by rotating the nut member 60. At this time, the operator can use a power tool such as an impact wrench, and in this case, it is preferable to use a deep socket corresponding to the length of the main shaft 40 protruding from the nut member 60. Thereby, the seat member 50 and nut member 60 provided on the main shaft 40 press the trailing arm 14 together with the coil spring 20 from the base end 40b side of the main shaft 40. As a result, the trailing arm 14 moves upward while compressing the coil spring 20.

During the operation of compressing the coil spring 20, the main shaft 40 of the jig 30 is placed inside the coil spring 20. The main shaft 40 is strongly fixed to the vehicle body 12 and the trailing arm 14 by receiving the reaction force of the coil spring 20. This prevents the coil spring 20 from falling off from between the vehicle body 12 and the trailing arm 14 when the coil spring 20 is compressed.

The jig 30 of this embodiment is configured such that the tip 40a of the main shaft 40 is locked to the vehicle body 12. However, as another embodiment, the jig 30 may be inserted into the coil spring 20 from the vehicle body 12 side, and the tip 40a of the main shaft 40 may be configured to be locked to the trailing arm 14. . In this case, the pressing mechanisms 50 and 60 may be configured to press the vehicle body 12 from the side opposite to the coil spring 20. Further, the configuration of the jig 30 described in this embodiment is not limited to the coil spring 20 of a suspension, but is also effective for various coil springs mounted on a vehicle. Regarding these points, the same applies to Examples 2 and 3 described below.

Referring to FIG. 5, the jig 130 of Example 2 will be described. The jig 130 of this embodiment further includes a crank handle 132 and a grip 134, and is different from the jig 30 of the first embodiment in this point. The rest of the configuration is the same as the jig 30 of Example 1, so redundant explanation will be omitted here. Crank handle 132 is connected to nut member 60. The operator can rotate the nut member 60 by rotating the crank handle 132. That is, the coil spring 20 can be compressed. The crank handle 132 may be removably attached to the nut member 60, or may be configured integrally with the nut member 60.

The grip 134 is provided on the sheet member 50. The grip 134 extends downward from the sheet member 50 and is configured to be gripped by an operator. When operating the crank handle 132 with one hand, the operator can strongly rotate the crank handle 132 by grasping the grip 134 with the other hand. Note that in the jig 130 of this embodiment, the grip 134 is not necessarily required and may be omitted as appropriate.

The jig 230 of Example 3 will be described with reference to FIG. 6. The jig 230 of this embodiment has the configurations of the pressing mechanisms 50, 232, and 234 changed, and is different from the jig 30 of the first embodiment in this point. That is, the jig 230 of this embodiment includes a sheet member 50, a stopper member 232, and a lever member 234 as pressing mechanisms 50, 232, and 234. Note that the sheet member 50 is the same as that of the jig 30 of the first embodiment.

The stopper member 232 is configured to abut the seat member 50 from the side opposite to the trailing arm 14 and hold the seat member 50 in position against the reaction force of the coil spring 20. The lever member 234 is swingably attached to the main shaft 40 and is swingably operated by the operator. When the operator swings the lever member 234, the lever member 234 presses the stopper member 232 toward the seat member 50. By repeating this, the stopper member 232 moves upward along the main shaft 40, and the coil spring 20 is compressed.

The specific configurations of the stopper member 232 and the lever member 234 are not particularly limited. Although this is an example, the stopper member 232 may have a check mechanism between it and the main shaft 40 that allows only upward movement. Further, the lever member 234 may have a through hole 234a at its tip, into which the main shaft 40 is inserted, and may be configured to be swingable about a fulcrum S formed on its inner surface.

Although the embodiments of the present technology have been described above in detail, these are merely examples and do not limit the scope of the claims. The techniques described in the claims include various modifications and changes to the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims as filed. Further, the techniques illustrated in this specification or the drawings simultaneously achieve a plurality of objectives, and achieving one of the objectives has technical utility in itself.

12: Vehicle body 14: Trailing arm 16: Torsion beam 20: Coil spring 26: Shock absorber 30, 130, 230: Jig 40: Main shaft 40a: Main shaft tip 40b: Main shaft base end 42: Main shaft screw Groove 50: Sheet member 60 of the pressing mechanism: Nut member 132 of the pressing mechanism: Crank handle 134: Grip 232: Stopper member 234 of the pressing mechanism: Lever member of the pressing mechanism

Claims (10)

A jig for compressing a coil spring disposed between a vehicle body and an arm swingably connected to the vehicle body,
a main shaft that is inserted into the coil spring and whose tip is locked to one of the vehicle body and the arm;
a pressing mechanism that is movably provided along the main shaft and that presses the other of the vehicle body and the arm from the side opposite to the coil spring;
A jig equipped with The pressing mechanism is
a seat member that abuts the other of the vehicle body and the arm;
a nut member that abuts the seat member from a side opposite to the other side of the vehicle body and the arm, and is screwed into a thread groove formed in the main shaft;
The jig according to claim 1. The jig according to claim 2, wherein contact surfaces of the sheet member and the nut member that contact each other are curved in a spherical shape. The jig according to claim 2 or 3, further comprising a crank handle connected to the nut member and rotated by an operator. 5. The jig according to claim 4, wherein the sheet member is provided with a grip for gripping with the other hand when the operator operates the crank handle with one hand. The pressing mechanism is
a seat member that abuts the other of the vehicle body and the arm;
a stopper member that abuts the seat member from a side opposite to the other side of the vehicle body and the arm and holds the seat member in position against the reaction force of the coil spring;
a lever member that is swingably attached to the main shaft and that presses the stopper member toward the seat member when swingably operated by an operator;
The jig according to claim 1. The jig according to any one of claims 1 to 6, wherein the coil spring is a coil spring of a suspension that suspends an axle. The jig according to claim 7, wherein the arm is a trailing arm located forward of the axle. The jig according to claim 8, wherein the suspension is a torsion beam suspension in which the pair of left and right trailing arms are connected by a torsion beam. A method for compressing a coil spring disposed between a vehicle body and an arm swingably connected to the vehicle body using the jig according to any one of claims 1 to 9.

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