JPH0444411Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a resin spring mounting structure in the axle support part of a vehicle, for example, in which a leaf spring made of fiber-reinforced synthetic resin (hereinafter referred to as an FRP spring) is mounted to the axle of a vehicle using a U-shaped bolt. The present invention also relates to an improved structure that allows the FRP spring to be accurately positioned and clamped with an appropriate clamping force using an inexpensive structure.

[Prior art]

Generally, FRP springs have lower surface hardness than steel leaf springs, and are more likely to be crushed (so-called sagging) due to the tightening force in the thickness direction. Conventionally, for example, in the resin spring mounting structure of automobiles, etc., in which FRP springs were attached to the axle of the automobile using U-shaped bolts, in order to prevent the occurrence of such crushing, for example, As disclosed in Publication No. −22540,
Surround the FRP spring with cushioning material and a metal cover,
The structure is such that the tightening force of the U-shaped bolt is absorbed by the elastic deformation of the cushioning material and the cover. Since such a conventional configuration requires a cushioning material and a cover, it is clear that the number of parts is larger, the configuration is more complicated, and the cost is higher than when using steel leaf springs. . In addition, in order to prevent the FRP spring from being crushed when tightening the U-shaped bolt, a plate material that is harder than the FRP spring, such as a steel plate or a hard urethane plate, is bonded to both the top and bottom of the FRP spring, and the material acts on the surface of the FRP spring. Attempts have already been made to lower the surface pressure. This conventional structure has fewer parts than the above-mentioned conventional structure that requires a cushioning material and a cover, and can be implemented easily and inexpensively. However, even in this case, a plate material with higher hardness than the FRP spring is required, so the number of parts is larger, the configuration is more complicated, and the price is higher than when using a steel leaf spring.

[Problem that the invention attempts to solve]

As mentioned above, when using FRP springs, in order to prevent the FRP springs from being crushed when tightening U-shaped bolts, the number of parts is larger and the configuration is more complicated than when using conventional steel leaf springs. It was thought that it was inevitable that they would become more expensive and therefore more expensive. The present invention was devised under the above circumstances, and the problem it seeks to solve is to properly clamp the FRP spring so that it is not crushed by the tightening force of the U-shaped bolt. To provide a resin spring mounting structure in an axle support part of a vehicle that can be accurately positioned and clamped by force, has a small number of parts, is simple in structure, and can be implemented at low cost.

[Means to solve the problem]

The present invention takes the following technical measures to solve the above problems. That is, the present invention provides a retainer for receiving the upper surface of the leaf spring on the upper axle of the leaf spring made of fiber-reinforced synthetic resin, and attaches the leg of the U-shaped bolt suspended from the axle to the lower surface of the leaf spring. In a mounting structure for a resin spring in an axle support part of a vehicle, the leaf spring is fixed to the axle by inserting the leaf spring into a fitted U-bolt seat and screwing a nut onto the leg of the U-shaped bolt from below to fix the leaf spring to the axle. A positioning bolt is passed through the retainer and the U-bolt seat in the vertical direction, and one of the retainer and the U-bolt seat has a recess into which the head of the positioning bolt is fitted in a positioning manner in the front-back and left-right directions, and the other has a recess for the positioning bolt. The legs are respectively formed with recesses into which they are fitted in a positioning manner in the front-back and left-right directions, and both recesses are provided with tightening margin regulating surfaces facing each other. It is characterized by the formation of a support surface that receives the pressure control surface.

[Effect]

The head or leg portion of the positioning bolt is fitted into each recess of the retainer and the U-bolt seat so as to position the head or leg of the positioning bolt in the front-back direction and the left-right direction. The retainer and the U-bolt seat are spaced apart by a predetermined distance or more by the respective tightening control surfaces formed thereon being received by the respective receiving surfaces formed on the head and leg portions of the positioning bolt. will not be allowed to approach. There is no need to insert a cushioning material, a metal cover, a plate material harder than the FRP spring, etc. between the retainer or U-bolt seat and the FRP spring.

【effect】

As described above, the tightening limit surfaces formed on the retainer and the U-bolt seat are received by the receiving surfaces formed on the head and legs of the positioning bolt to regulate the tightening limit of the FRP spring. By doing so, the retainer and the U-bolt seat are
The surface pressure acting on the surface of the FRP spring can be set lower than the surface pressure that would cause the FRP spring to collapse, and it is possible to prevent the FRP spring from being crushed by the tightening force of the U-shaped bolt. Further, each recess of the retainer and the U-bolt seat is fitted with the head or leg of the positioning bolt in a positioning manner in the front-rear direction and left-right direction, so that the FRP spring can be inserted through the positioning bolt.
It can be positioned and held between the retainer and the U-bolt seat in the front-rear direction and the left-right direction. Furthermore, with the above retainer and U bolt seat,
Cushioning material between FRP spring, metal cover, FRP
Since plate materials having higher hardness than the springs can be omitted, the number of parts can be reduced as in the case of using steel leaf springs, and the structure is simple and can be implemented at low cost.

[Explanation of Examples]

Embodiments of the present invention will be specifically described below with reference to the drawings. As shown in FIG. 2, the FRP spring 1 has a front end 1a and a rear end 1b rotatably connected to a chassis S, and an intermediate part 1c connected to a rear axle 2. A steel plate retainer 3 is welded to the lower circumferential surface of the rear axle 2, and is made of FRP
The intermediate portion 1c of the spring 1 is brought into contact with the lower surface of the retainer 3. A U-bolt seat 4 made of iron plate is applied to the lower surface of the intermediate portion 1c of the FRP spring 1.
As shown in FIG. 1, each bolt insertion hole 6 is formed in this U-bolt seat 4 through which both legs 5a of a steel U-bolt 5 suspended from the rear axle 2 can be inserted. Both leg portions 5a of the supported U-bolt 5 pass through these bolt insertion holes 6 and are made to protrude below the U-bolt seat 4. Iron nuts 7 are screwed into both legs 5a of the U bolt 5 that protrudes below the U bolt seat 4, and by tightening these nuts 7, the intermediate portion 1c of the FRP spring 1 is tightened.
is held between the retainer 3 and the U-bolt seat 4. At a predetermined position of the intermediate portion 1c of the FRP spring 1, a center bolt 8 is provided as a positioning bolt that is useful for regulating the tightening of the FRP spring 1 and positioning it with respect to the retainer 3 and the U-bolt seat 4, as will be described later. is passed through in the vertical direction. This center bolt 8 is made of iron and is bonded to the FRP spring 1 as required. A recess 9 is formed in the lower surface of the retainer 3, into which the leg 8a of the center bolt 8 can be fitted in a positioning manner in the front-rear direction and the left-right direction. This recess 9 has a tightening interference regulating surface 1 that is configured at the inner end surface of the recess 9 and that regulates the fitting depth of the leg portion 8a of the center bolt 8.
0 is formed. Further, the U-bolt seat 4 is provided with a recess 11 that faces the recess 9 of the retainer 3 and into which the head 8b of the center bolt 8 can be inserted in a positioning manner in the front-back and left-right directions. A tightness regulating surface 12 is formed to regulate the fitting depth of the head 8b of the center bolt 8. A receiving surface 13 is formed on the tip end surface of the leg portion 8a of the center bolt 8 to receive the tightening interference regulating surface 10 of the retainer 3, and the head portion 8 of the center bolt 8
Tightness regulation surface 10 of U bolt seat 4 with stepped surface b
A receiving surface 14 is formed for receiving. The spacing between the receiving surfaces 13 and 14 is such that the distance between the retainer 3 and the U-bolt seat 4 is such that the respective tightening regulation surfaces 10 and 12 are received by these surfaces.
The dimension A is set to ensure an appropriate untightening dimension B, which is obtained by subtracting an appropriate tightening allowance from the natural thickness of the intermediate portion 1c of the FRP spring 1 so that the surface pressure acting there does not exceed a predetermined value. . When the nut 7 is tightened onto the U-bolt 5, the intermediate portion 1c of the FRP spring 1 receives surface pressure from the retainer 3 and the U-bolt seat 4 due to the tightening force, and is tightened until a predetermined appropriate tightening distance is reached. However, when this tightening amount reaches a predetermined appropriate tightening amount, the receiving surface 13 receives the tightening limit regulating surface 10 of the retainer 3, and the receiving surface 14 receives the tightening limit regulating surface 12 of the U-bolt seat 4. , the nut 7 can no longer be tightened into the U-bolt 5, and the retainer 3
and middle part 1 of FRP spring 1 from U bolt seat 4
It becomes impossible to further increase the surface pressure acting on c. That is, the surface pressure acting on the intermediate portion 1c of the FRP spring 1 will not exceed the above-mentioned predetermined value. In addition, the retainer 3 of the intermediate portion 1c of the FRP spring 1
The longitudinal and lateral positions of the center bolt 8 are determined by fitting the legs 8a of the center bolt 8 into the recesses 9 of the retainer 3. The position in the left-right direction is determined by fitting the head 8b of the center bolt 8 into the recess 11 of the U-bolt seat 4. Furthermore, retainer 3 and U bolt seat 4
Unlike the above conventional examples, there is no cushioning material, metal cover, plate material harder than the FRP spring 1, etc. inserted between the FRP spring 1 and the FRP spring 1, so the number of parts is small.
The structure is simplified and, for example, each FRP spring can be manufactured at a lower cost than these conventional examples. Of course, this invention is not limited to the above-mentioned embodiment, but includes modifications that can be easily made by those skilled in the art within the scope of the above-mentioned utility model registration claims. For example, the positioning bolt has a recess 9
The shape may be any shape as long as it can be combined with the concave portion 11 to position the FRP spring 1 with respect to the retainer 3 and the U-bolt seat 4, and it does not matter what name is used in trade, such as bolt, pin, or rivet. Further, the shape of the head and the shape of the leg of the positioning bolt may be the same. Furthermore, it is not necessary to fix the positioning bolt to the FRP spring 1, and the positioning bolt may be fixed to the retainer 3 or the U-bolt seat 4.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a main part of an embodiment of this invention, and FIG. 2 is a side view showing a structure for attaching the FRP spring 1 to the chassis S. 1...FRP spring, 2...rear axle, 3...
...retainer, 4 ... U bolt seat, 5 ... U bolt, 7 ... nut, 8 ... center bolt (positioning bolt), 9 ... recess, 10 ... tightening limit surface,
DESCRIPTION OF SYMBOLS 11... Recessed part, 12... Tightness regulating surface, 13... Receiving surface, 14... Receiving surface.

Claims (1)

[Claims for Utility Model Registration] A retainer is provided on the upper axle of the leaf spring made of fiber-reinforced synthetic resin to receive the upper surface of the leaf spring, and the leg of the U-shaped bolt suspended from the axle is attached to the upper axle of the leaf spring. In the mounting structure of the resin spring in the axle support part of a vehicle, the above-mentioned resin spring is fixed to the axle by inserting it into a U-bolt seat applied to the lower surface and screwing a nut onto the leg of the U-shaped bolt from below to fix the leaf spring to the axle. A positioning bolt is passed through the leaf spring in the vertical direction, and a recess is formed in one of the retainer and the U-bolt seat into which the head of the positioning bolt is fitted in a positioning manner in the front-back and left-right directions, and the other is provided with a recess for positioning the bolt. A recess is formed into which the leg of the bolt is fitted in a positioning manner in the front-rear direction and left-right direction, and both recesses are provided with tightening margin regulating surfaces facing each other. A mounting structure for a resin spring in an axle support portion of a vehicle, characterized in that a support surface is formed to receive these tightness regulating surfaces.