JP2019157887A - Spring for suspension device for vehicle - Google Patents

Abstract

To disclose one embodiment of a spring for a suspension device which can suppress the early damage of a spring part constituted of a metal-made wire rod.SOLUTION: In a spring which comprises a seat part 3 having a groove part 3A into which a wire rod 2A is fit, and adhering to the wire rod 2A with an adhesive, a minimum thickness dimension Tb of an adhesion material which protrudes from the groove part 3A is not smaller a thickness dimension Td of an adhesive layer formed in the groove part 3A. By this constitution, it can be suppressed that a wall thickness dimension of a boundary part between a protruded part Bo and the adhesive layer AD becomes excessively small. Therefore, since it is suppressed that the protruded part Bo is fractured, the early damage of a spring part 2 can be suppressed.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a spring used in a vehicle suspension device.

  For example, in the invention described in Patent Document 1, a metal coil spring and a plastic holding member are bonded via an adhesive. In the present invention, after the adhesive is applied to the holding member, the coil spring is mounted on the applied portion, whereby the coil spring is bonded to the holding member.

JP 2017-15249 A

In the suspension device spring described in Patent Document 1, the coil spring may be damaged early for the following reason.
That is, after the adhesive is applied to the holding member, when the coil spring is placed on the applied portion, a part of the applied adhesive protrudes from the bonding surface between the coil spring and the holding member. It is very likely that

  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) due to vehicle vibration or secular change. May break from the adhesive layer.

  In the case where the protruding portion is broken, if the load is applied to the coil spring and the coil spring and the holding member are deformed, 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.

If the breakage 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 early from the damaged portion.
This indication discloses an example of the spring for suspension devices which can control that the spring part comprised with metal wire rods is damaged early in view of the above-mentioned point.

  The vehicle suspension spring is a metal wire (2A) that constitutes the spring portion (2), the wire (2A) having a coating layer on the surface, and a load acting on the spring portion (2). A rubber sheet portion (3) to be received, including a groove portion (3A) into which the wire (2A) is fitted, and a sheet portion (3) bonded to the wire (2A) with an adhesive. .

The minimum thickness dimension (Tb) of the adhesive protruding from the groove (3A) is preferably, for example, equal to or greater than the thickness dimension (Td) of the adhesive layer formed in the groove (3A).
Thereby, it can be suppressed that the thickness dimension of the boundary portion between the protruding portion and the adhesive layer becomes excessively small. Therefore, since the protrusion part is suppressed from breaking, it is possible to suppress the spring part (2) from being damaged early.

  In addition, even if it is the structure where the adhesive pool (4) which controls the flow of the said adhesive agent by storing an adhesive agent in the width direction edge part of a groove part (3A) exists, it is between a protrusion part and an adhesive layer. It can be suppressed that the thickness dimension of the boundary portion becomes excessively small.

Therefore, even if it is the structure where the adhesive reservoir (4) exists, since the protrusion part is suppressed, it can suppress that a spring part (2) is damaged early.
Incidentally, the reference numerals in the parentheses above are examples showing the correspondence with the specific configurations described in the embodiments described later, and the present disclosure is limited to the specific configurations indicated in the reference numerals in the parentheses. It is not something.

It is a figure which shows the spring which concerns on 1st Embodiment. It is a figure which shows the sheet | seat part in 1st Embodiment. It is a figure which shows the contact bonding layer in 1st Embodiment. It is a figure which shows the A section of FIG. 2 which is the characteristic part of 1st Embodiment. It is a figure for demonstrating the characteristic of 1st Embodiment. It is a figure which shows the A section equivalent of FIG. 2 which is the characteristic part of 2nd Embodiment. It is a figure which shows the A section equivalent of FIG. 2 which is the characteristic part of 3rd Embodiment. It is a figure which shows the A section equivalent of FIG. 2 which is the characteristic part of 3rd Embodiment.

  The following “embodiments of the invention” show examples of embodiments belonging to the technical scope of the present disclosure. In other words, the invention specific items described in the claims are not limited to the specific configurations and structures shown in the following embodiments.

  In addition, the arrow etc. which show the direction attached | subjected to each figure were described in order to make it easy to understand the relationship between each figure. The invention described in the present specification is not limited to the directions given to the drawings.

  At least one member or part described with at least a reference numeral is provided, except where “one” or the like is cut off. That is, when there is no notice such as “one”, two or more members may be provided.

The present embodiment is an example in which the above manufacturing method is applied to a manufacturing method of a vehicle suspension spring.
(First embodiment)
1. Configuration of Suspension Device Spring A suspension device spring 1 shown in FIG. 1 (hereinafter referred to as a spring 1) includes at least a spring portion 2, a seat portion 3, and the like. The spring part 2 is a spring composed of a metal wire 2A.

  A coating layer 2B that covers the entire wire 2A is provided on the surface of the wire 2A. In addition, the spring part 2 which concerns on this embodiment is a coil spring shape | molded by the coil shape. The coating layer 2B is a thin film in which a resin such as a thermosetting resin is formed by baking.

  The seat part 3 is a rubber sheet that receives a load acting on the spring part 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 2A is fitted.

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

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

2. Structure of Bonded Part In the bonded part A, as shown in FIG. 4, the minimum thickness dimension Tb of the adhesive protruding from the groove 3A (hereinafter referred to as the protruding part Bo) is the adhesive layer AD formed in the groove 3A. It is comprised so that it may become more than the thickness dimension Td.

  Specifically, an adhesive reservoir 4 that restricts the flow of the adhesive by storing the adhesive is provided at the end in the width direction of the groove 3A. The adhesive reservoir 4 according to the present embodiment is configured by a planar portion 4A configured in a substantially planar shape provided at an end in the width direction of the groove 3A.

  For example, in the configuration shown in FIG. 4, the minimum thickness dimension Tb of the protruding portion Bo is a dimension that is substantially equal to the distance at the portion where the flat surface portion 4A and the wire 2A are closest to each other. The thickness dimension Td of the adhesive layer AD refers to, for example, the minimum thickness dimension of the adhesive layer AD or the thickness dimension of the adhesive layer AD in a portion close to the minimum thickness dimension Tb.

  In the present embodiment, the size of the adhesive reservoir 4, that is, the width dimension Wo of the flat surface portion 4A is determined so that the minimum thickness dimension Tb of the protruding portion Bo is larger than the thickness dimension Td of the adhesive layer AD. .

3. Characteristics of Spring According to this Embodiment As shown in FIG. 5, when the adhesive reservoir 4 is not provided at the width direction end of the groove 3A, the adhesive protruding to the width direction end of the groove 3A is Since it flows along the upper surface 3B of the sheet part 3, the possibility that the minimum thickness dimension Wb of the protruding part Bo is excessively small is extremely high.

  On the other hand, in the present embodiment, since the adhesive that protrudes to the end in the width direction of the groove 3A is accumulated in the adhesive reservoir 4, it is possible to suppress the minimum thickness dimension Tb of the protruding portion Bo from becoming excessively small. Therefore, since the protruding portion Bd is prevented from breaking, the spring portion 2 can be prevented from being damaged early.

(Second Embodiment)
As shown in FIG. 6, the adhesive reservoir 4 according to the present embodiment is configured by a weir 4 </ b> B provided at the end in the width direction of the groove 3 </ b> A. The weir 4B is constituted by a ridge that extends along the groove 3A in a state of protruding upward in the widthwise end of the groove 3A.

  As a result, the adhesive that protrudes to the end in the width direction of the groove 3A is blocked by the weir 4B, so that the adhesive that protrudes to the end of the groove 3A in the width direction accumulates in the adhesive reservoir 4. Accordingly, it is possible to suppress the minimum thickness dimension Tb of the protruding portion Bo from becoming excessively small.

In addition, the same code | symbol as the above-mentioned embodiment is attached | subjected to the same component requirements as the above-mentioned embodiment. For this reason, in this embodiment, the overlapping description is omitted.
(Third embodiment)
The adhesive reservoir 4 according to the first embodiment is configured by a flat surface portion 4A that extends substantially horizontally from the upper end of the widthwise end portion of the groove portion 3A (see FIG. 4). On the other hand, in this embodiment, as shown in FIGS. 7 and 8, the flat surface portion 4A or the upper surface 3B and the inner wall surface of the groove portion 3A are connected by a curved surface 4C or a flat surface 4D.

Thereby, since it becomes so large that the thickness of contact bonding layer AD approaches the width direction edge part of 3 A of groove parts, it can suppress that the minimum thickness dimension Tb of the protrusion part Bo becomes small too much.
In addition, the same code | symbol as the above-mentioned embodiment is attached | subjected to the same component requirements as the above-mentioned embodiment. For this reason, in this embodiment, the overlapping description is omitted.

(Other embodiments)
In the above-described embodiment, the adhesive reservoir 4 is used to configure the minimum thickness dimension Tb of the protruding portion Bo to be equal to or greater than the thickness dimension Td of the adhesive layer AD. However, the invention disclosed in the present specification is not limited to this. That is, a configuration other than the adhesive reservoir 4 may be used as long as the minimum thickness dimension Tb is equal to or greater than the thickness dimension Td of the adhesive layer AD.

  The weir 4B according to the second embodiment was a protrusion that continuously extended along the groove 3A. However, the configuration of the weir 4B is not limited to the ridge continuously extending along the groove 3A. That is, for example, a plurality of protrusions or the like scattered along the groove 3A, or one protrusion or protrusion may be used.

  Furthermore, the present disclosure is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims. Therefore, you may combine at least 2 embodiment among several embodiment mentioned above.

DESCRIPTION OF SYMBOLS 1 ... Spring for suspension apparatus 2 ... Spring part 2A ... Wire 2B ... Covering layer 3 ... Sheet part 3A ... Groove part 3B ... Upper surface 4A ... Plane part 4B ... Weir 4C ... Curved surface 4D ... Plane AD ... Adhesion layer

Claims (2)

In springs used in vehicle suspension systems,
A metal wire constituting the spring portion, the wire provided with a coating layer on the surface;
A rubber sheet portion that receives a load acting on the spring portion, and has a groove portion into which the wire is fitted, and a sheet portion bonded to the wire with an adhesive,
The suspension spring according to claim 1, wherein a minimum thickness of the adhesive protruding from the groove is equal to or greater than a thickness of an adhesive layer formed in the groove. In springs used in vehicle suspension systems,
A metal wire constituting the spring portion, the wire provided with a coating layer on the surface;
A rubber sheet portion that receives a load acting on the spring portion, and has a groove portion into which the wire is fitted, and a sheet portion bonded to the wire with an adhesive,
The suspension device spring including an adhesive reservoir that restricts the flow of the adhesive by storing the adhesive at an end in the width direction of the groove.

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