JP2019157886A - 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: A difference between the hardness of a seat part 3 and the hardness of an adhesive (adhesive layer AD) is larger than a difference between the adhesive (adhesive layer AD) and a coated layer 2B. Normally, since exfoliation is liable to occur at a boundary face having a larger difference of the hardness more than the other boundary face, the boundary face between the seat part 3 and the adhesive layer AD is liable to be exfoliated from the boundary face between the adhesive layer AD and the coated layer 2B. Therefore, even if the adhesive layer AD is exfoliated, the coated layer 2B can be maintained in a state of being coated with the adhesive layer AD, and thereby it can be suppressed that the coated layer 2B is damaged in an early stage. Also, since it is suppressed that a metal-made wire rod 2A is damaged in an early stage, the early damage of a spring part 2 can be suppressed.SELECTED DRAWING: Figure 3

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 said invention, the hardness of an adhesive material is smaller than the hardness of the coating layer of a wire.

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, the suspension device spring described in Patent Document 1 absorbs part of the load energy with the adhesive by reducing the hardness of the adhesive. For this reason, there exists a possibility that an adhesive may peel from the interface surface of an adhesive agent and a coating layer by an aged load.

  When the adhesive is peeled off at the boundary surface between the adhesive and the coating layer, the adhesive comes into contact with the coating layer so as to rub against the coating layer due to load fluctuations, which may cause early damage to the coating layer. When the coating layer is damaged, the metal wire is damaged at an early stage, so that the coil spring is damaged at an early stage.

  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 suspension for a vehicle suspension is a metal wire (2A) constituting the spring portion (2), the wire (2A) having a coating layer (2B) on the surface, and the spring portion (2). A rubber sheet portion (3) that receives an acting load, and includes a sheet portion (3) bonded to the coating layer (2B) with an adhesive. The difference between the hardness of the sheet portion (3) and the hardness of the adhesive is desirably larger than the difference between the hardness of the adhesive and the hardness of the coating layer (2B), for example.

  A boundary surface having a larger difference in hardness is more easily peeled off. For this reason, in the vehicle suspension spring, the boundary surface between the seat portion (3) and the adhesive is more easily peeled off than the boundary surface between the adhesive and the coating layer. Therefore, since the coating layer (2B) can be maintained in a state covered with an adhesive, it is possible to suppress the coating layer (2B) from being damaged early.

Furthermore, since it is suppressed that a metal wire (2A) is damaged early, it can be suppressed 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 embodiment. It is a figure which shows the sheet | seat part in embodiment. It is a figure which shows the contact bonding layer in 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. In this embodiment, as the adhesive, the difference between the hardness of the sheet 3 and the hardness of the adhesive (adhesive layer AD) is the difference between the hardness of the adhesive (adhesive layer AD) and the hardness of the coating layer 2B. Adhesives that are larger than the difference are used.

  Specifically, the adhesive is an adhesive (for example, an epoxy adhesive) having excellent weather resistance. The seat portion 3 is a natural rubber rubber. The coating layer 2B is an epoxy-polyester resin. The thickness dimension of the adhesive layer AD by the adhesive is about 1 mm. The thickness dimension of the coating layer 2B is about 40 μm or more.

  The hardness of the adhesive (adhesive layer AD) refers to the hardness when the adhesive is sufficiently cured. Specifically, for example, in the adhesive according to the present embodiment, it is the hardness when about 8 hours have passed at room temperature, or the hardness when heated in a furnace at 100 ° C. for about 20 minutes.

3. Characteristics of Spring According to this Embodiment Usually, the boundary surface having a larger hardness difference is more easily peeled off. For this reason, in the spring 1 according to the present embodiment, the boundary surface between the sheet portion 3 and the adhesive layer AD is more easily peeled off than the boundary surface between the adhesive layer AD and the coating layer 2B.

  Therefore, even when peeling occurs in the adhesive layer AD, the coating layer 2B can be maintained in a state covered with the adhesive layer AD, and therefore, the coating layer 2B can be prevented from being damaged early. As a result, the metal wire 2 </ b> A is prevented from being damaged early, so that the spring portion 2 can be prevented from being damaged early.

(Other embodiments)
In the above-described embodiment, the adhesive is an epoxy adhesive, the sheet portion 3 is natural rubber rubber, and the coating layer 2B is an epoxy-polyester resin. However, the invention disclosed in the present specification is not limited to this.

  That is, the present invention is configured such that the difference between the hardness of the sheet portion 3 and the hardness of the adhesive (adhesive layer AD) is greater than the difference between the hardness of the adhesive (adhesive layer AD) and the hardness of the coating layer 2B. For example, the specific material may be other than the above materials.

  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. Furthermore, it can be applied to other than the suspension spring.

DESCRIPTION OF SYMBOLS 1 ... Spring for suspension apparatus 2 ... Spring part 2A ... Wire rod 2B ... Cover layer 3 ... Sheet part 3A ... Groove part AD ... Adhesive 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 includes a sheet portion bonded to the covering layer with an adhesive;
The suspension spring according to claim 1, wherein a difference between the hardness of the sheet portion and the hardness of the adhesive is greater than a difference between the hardness of the adhesive and the hardness of the coating layer. The spring portion is a coil spring;
The seat portion is a suspension device spring that is bonded to the end winding portion of the spring portion.

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