JP7032172B2 - Spring manufacturing method for suspension system - Google Patents

Description

The present disclosure relates to a method of manufacturing a spring used in a vehicle suspension system.

For example, in the invention described in Patent Document 1, a metal coil spring and a plastic holding member are adhered to each other via an adhesive. In the present invention, after the adhesive is applied to the holding member, the coil spring is placed on the applied portion, so that the coil spring is adhered to the holding member.

Japanese Unexamined Patent Publication No. 2017-15249

In the suspension device spring described in Patent Document 1, the coil spring may be damaged at an early stage due to the following reasons.
That is, when the coil spring is placed on the applied portion after the adhesive is applied to the holding member, a part of the applied adhesive protrudes from the adhesive surface between the coil spring and the holding member. It is very likely that it will end up.

Due to vehicle vibration, aging, etc., cracks occur between the adhesive protruding from the adhesive surface (hereinafter referred to as the protruding portion) and the adhesive existing on the adhesive surface (hereinafter referred to as the adhesive layer), and the protruding portion occurs. May break from the adhesive layer.

When the protruding portion is broken and a load is applied to the coil spring to deform the coil spring and the holding member, the protruding portion is displaced relative to the coil spring. When the protruding portion is displaced with respect to the coil spring, the broken portion of the protruding portion and the coil spring rub against each other.

When the broken portion of the protruding portion and the coil spring rub against each other, the coating layer provided on the surface of the coil spring is damaged, so that the coil spring is damaged at an early stage from the damaged portion.
In view of the above points, the present application discloses an example of a spring for a suspension device that can prevent a spring portion made of a metal wire from being damaged at an early stage.

The spring used in the vehicle suspension device is a metal wire rod (2A) constituting the spring portion (2), and acts on the wire rod (2A) having a coating layer on the surface and the spring portion (2). A rubber sheet portion (3) that receives a load to be applied, has a groove portion (3A) into which a wire rod (2A) is fitted, and is a sheet portion (3) bonded to the wire rod (2A) with an adhesive. And prepare.

The inner wall surface of the groove portion (3A) is, for example, a recess (4) having a width dimension (W2) smaller than the groove width (W1) of the groove portion (3A) and can store an adhesive. It is desirable that a possible recess (4) is provided.

As a result, the person who manufactures the spring for the suspension device can place the wire rod (2A) in the groove portion (3A) after placing the adhesive in the recess (4). Therefore, in the suspension device spring, after the adhesive is applied to the entire groove portion (3A), the adhesive material that protrudes from the adhesive surface is compared with the case where the wire rod (2A) is placed on the applied portion. It may be possible to reduce the amount. As a result, it is possible to prevent the protruding portion from breaking from the adhesive layer, so that early damage to the spring portion due to the breaking of the protruding portion is suppressed.

Incidentally, the reference numeral in each of the parentheses is an example showing a correspondence relationship with the specific configuration and the like described in the embodiment described later, and the present invention is limited to the specific configuration and the like shown in the reference numeral in the parentheses. It's not something.

It is a figure which shows the spring which concerns on 1st Embodiment. It is a figure which shows the sheet part in 1st Embodiment. It is a figure which shows the characteristic of the spring which concerns on 1st Embodiment. It is a figure which shows the feature of the sheet part which concerns on 1st Embodiment. A and B are diagrams showing the characteristics of the seat portion according to the first embodiment.

The following "invention embodiment" shows an example of an embodiment belonging to the technical scope of the present invention. That is, the matters specifying the invention described in the claims are not limited to the specific configuration, structure, etc. shown in the following embodiments.

It should be noted that the arrows and the like indicating the directions attached to each figure are described in order to make it easier to understand the relationship between each figure. The inventions described herein are not limited to the directions given in each figure.

At least one member or part described with a reference numeral is provided, except when a notice such as "one" is given. That is, if there is no notice such as "one", two or more of the members may be provided.

(First Embodiment)
In this embodiment, the suspension device spring and the suspension device rubber sheet are applied to the front wheel suspension device of the vehicle.

1. 1. Configuration of Suspension Device Spring and Suspension Device Rubber Sheet The suspension device spring 1 (hereinafter referred to as spring 1) shown in FIG. 1 includes at least a spring portion 2 and a seat portion 3.

The spring portion 2 is a spring made of a metal wire rod 2A. A covering layer 2B covering the entire wire rod 2A is provided on the surface of the wire rod 2A. The spring portion 2 according to the present embodiment is a coil spring formed into a coil shape. The coating layer 2B is a thin film formed of a resin such as a thermosetting resin.

The seat portion 3 is an example of a rubber seat for a suspension device that receives a load acting on the spring portion 2. The sheet portion 3 is made of an elastically deformable resin such as rubber. As shown in FIG. 2, the sheet portion 3 is provided with a groove portion 3A into which the wire rod 2A is fitted.

The groove portion 3A is a groove into which the wire rod 2A constituting the end winding portion is fitted. That is, the seat portion 3 is arranged at one end in the axial direction of the spring portion 2 configured in a coil shape, and comes into contact with the wire rod 2A constituting the end turn portion (see FIG. 1). The wire rod 2A according to the following is a portion of the wire rod 2A that constitutes a countersunk portion.

The wire rod 2A is adhered to the inner wall surface of the sheet portion 3, that is, the groove portion 3A with an adhesive. Therefore, as shown in FIG. 3, an adhesive layer AD made of the adhesive is formed between the wire 2A and the inner wall surface of the groove 3A.

Then, as shown in FIG. 4, at least one recess 4 is provided on the inner wall surface of the groove 3A. The width dimension W2 of the recess 4 is smaller than the groove width W1 of the groove portion 3A. In the adhesive application step described later, the adhesive Adh is applied to the recess 4. Therefore, the adhesive is accumulated in the recess 4A.

As shown in FIG. 2, the recess 4 according to the present embodiment is configured to have a first recess 4A, a plurality of second recesses 4B, and the like. The first recess 4A is a groove-shaped recess extending along the groove 3A at the bottom of the groove 3A. Each second recess 4B is a recess extending in the groove width direction from the first recess 4A.

2. 2. Adhesion method between the wire rod and the sheet portion Adhesion between the inner wall surface of the sheet portion 3, that is, the groove portion 3A and the wire rod 2A is performed by an adhesion method including at least the following steps.

(1) The person performing the bonding work or the bonding work device (hereinafter referred to as a worker or the like) first applies a predetermined amount of adhesive to the recess 4, that is, the first recess 4A and the second recess 4B. .. The "predetermined amount" is an amount determined by a test or the like.

(2) Next, the operator places the spring portion 2 on which the coating layer 2B has already been formed so as to bring the wire rod 2A into contact with the inner wall of the groove portion 3A on the sheet portion 3, and then mounts the spring portion 2 on the sheet portion 3. A mounting step of pressing the sheet portion 3 with a predetermined pressing force for a predetermined time is performed.

As a result, the adhesive applied (placed) in the recess 4 spreads over the entire inner wall surface of the groove 3A along the inner wall surface. After that, the operator or the like performs an adhesive curing step of heating the spring 1 for a predetermined time in an atmosphere of a predetermined temperature. The curing step may be performed in an atmosphere at room temperature.

3. 3. Features of the spring or the like according to the present embodiment A person who manufactures the spring 1, that is, an operator or the like, can place the adhesive Adh in the recess 4 and then place the wire 2A in the groove 3A. Therefore, in the spring 1, after the adhesive is applied to the entire groove 3A, the wire 2A protrudes from the adhesive surface as compared with the case where the wire 2A is placed on the applied portion (spring described in Patent Document 1). It may be possible to reduce the amount of adhesive. As a result, it is possible to prevent the protruding portion from breaking from the adhesive layer AD, so that early damage to the spring portion due to the breaking of the protruding portion is suppressed.

(Second Embodiment)
The cross-sectional shape of the recess 4 (particularly, the first recess 4A) according to the above-described embodiment was semicircular. On the other hand, the cross-sectional shape of the recess 4 according to the present embodiment is a shape other than the semicircular shape. Specifically, for example, as shown in FIG. 5A or FIG. 5B, it has a triangular shape or a trapezoidal shape.

Since the same configuration requirements and the like as those in the above-described embodiment are designated by the same reference numerals as those in the above-described embodiment, duplicate description will be omitted.
(Other embodiments)
The first recess 4A according to the above-described embodiment was a groove-shaped recess extending along the groove 3A. However, the invention disclosed in the present specification is not limited to this. That is, for example, the first recess 4A may be composed of a plurality of recesses scattered along the groove 3A. The second recess 4B may be abolished, or the first recess 4A may be composed of one recess.

Furthermore, the present invention is not limited to the above-described embodiment as long as it conforms to the gist of the invention described in the claims. Therefore, at least two of the plurality of embodiments described above may be combined.

1 ... Spring for suspension device 2 ... Spring part 2A ... Wire rod 2B ... Coating layer 3 ... Sheet part 3A ... Groove part 4 ... Recess

Claims (2)

A metal wire that constitutes a spring portion and has a coating layer on its surface.
A rubber sheet portion that receives a load acting on the spring portion, has a groove portion into which the wire rod is fitted, and is provided with a seat portion that is adhered to the wire rod with an adhesive.
In the method for manufacturing a spring for a suspension device, the inner wall surface of the groove is provided with a recess having a width smaller than the groove width of the groove and having a recess in which an adhesive is accumulated.
After applying a predetermined amount of adhesive to the recess, the spring portion on which the coating layer is formed is placed on the seat portion so that the wire rod comes into contact with the inner wall of the groove portion. A featured spring manufacturing method for suspension devices . The spring for a suspension device according to claim 1, wherein after the spring portion is placed on the seat portion, the spring portion is pressed against the seat portion with a predetermined pressing force for a predetermined time. Production method.

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