JPS58187618A - Bush with elastic body - Google Patents

Abstract

PURPOSE:To reduce variation in the size accuracy of a bush, by a method wherein an outer peripheral surface of an elastic body is brought into contact with an inner peripheral surface of an outer sleeve without joining together of them, and annular locking parts are attached to the ends of the outer sleeve. CONSTITUTION:An adhesive is coated on an outer peripheral surface of a bush body 1 having a solid lubricating layer 11 at an inner surface, and a rubber elastic body 2 is vulcanized for adhesion. Thereafter, the bush body 1 having the rubber elastic body 2 at its outer peripheral surface is pressed in an outer sleeve 3, and the ends of the outer sleeve 3 are drawn to form annular locking parts 31 and 32 at the ends. As noted, the outer sleeve 3 is kept from being adhered to the rubber elastic body 2, and this prevents the size accuracy of the bush body 1 from varying due to deformation caused by adhesion.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bushing 1 having an elastic body, and particularly to a bushing 1 having an elastic body suitable for a part where a shaft swings, such as a steering device of an automobile.

The bushing 1, which has an elastic body, holds the shaft rotatably and movably in the axial direction, and includes a main body of the bushing 1 forming an inner sleeve, an outer sleeve fixed to a fixed part, and a cylindrical bushing interposed between them. It is composed of an elastic body made of rubber, etc., and enables rotation of the shaft and movement in the axial direction.
In addition to the function of the main body, it also has the function of absorbing the vibration of the shaft with an elastic body. For this reason, bushicos having an elastic body are often used for steering wheels of automobiles, specifically, for steering rack supports.

The conventional bushing with an elastic body fixes the elastic body between the bushico main body and the outer sleeve 1, so the contact surface between the outer circumferential surface of the bushico body and the inner circumferential surface of the elastic body, and the contact surface between the outer circumferential surface of the elastic body and the outer sleeve By interposing the adhesive on the contact surface of the inner circumferential surface,
However, both contact surfaces were vulcanized and bonded. In this vulcanization contact [t5, the strain of the shielding agent 41 and the elastic body is concentrated in the reed 1 body, which has weak mechanical strength compared to the outer sleeve, and It was discovered that the roundness and inner diameter change were significant factors.

For this reason, the conventional bushiko with an elastic body has \[
The stability of bamboo is not 1-minute, and sometimes problems such as low roundness of the bush body or 1-minute change occur, and when used as a support device for a Sude I-ring rack, the shaft of There were inconveniences such as H8 occurring between the rack and a certain rack and friction mh becoming high.

The bushing with the elastic body of the present invention has a m structure that does not have the problems of the conventional one. In other words, the elastic bushing of the present invention consists of a cylindrical assembly 2 body, a cylindrical outer three 1 disposed concentrically with the assembly 1 body, and an intermediate portion between the bushing body and the outer sleeve. A cylindrical elastic body interposed between
The outer circumferential surface of the main body of the L bushing 1 and the inner circumferential surface of the elastic body are bonded to form a C body, and the outer circumference of the elastic body and the inner circumferential surface of the outer three 1 are in contact without bonding, and the outer sleeve A ring-shaped locking portion extending in the direction of the central axis is provided at both ends of the elastic body, and the elastic body is held by the locking portion.

In the case of J, -r r'' having an elastic body according to the present invention, the outer circumferential surface of the bush body is covered with the elastic body with an adhesive interposed therebetween, and heated in that state to connect the body of the blur 1 and the elastic body.

In this case, abnormal strain occurs in the elastic body due to heating, and since the outer circumferential surface of the elastic body is deformed, the force does not cause deformation of the 1 series body. The main body of the reed 1 covered with this elastic body is inserted into the outer sleeve I, and both end surfaces of the outer sleeve are squeezed with a press to form a ring-shaped engagement portion 1 extending in the direction of the center axis. Since the engagement between the bullet f1 body and the outer sleeve is made at this locking portion, it is difficult for the bullet f1 body covered with the elastic body to fall out of the outer sleeve.

Bush body (,
1 It is the same as the main body of the Congo Song Dynasty, and there are various known l sills.
can be used as one reed body. Particularly when used as a support device for a snoring rack, it is preferable to refer to the wound bushing 1 having a solid lubricating layer containing a fluororesin on its inner surface as a bushing body.

As the elastic material, synthetic imes such as SBR, NBR, urethane rubber, and natural rubber can be used. The elastic body may be the same as the conventional elastic body.

This differs from conventional outer sleeves in that the outer sleeve l is not joined to the elastic body and that locking portions are provided at both end openings of the outer sleeve.

Although forming the locking JL portion by mechanical drawing is easy and mass-producible, the locking portion may be formed by other methods. With a special large elastic body, the ring-shaped locking part is connected to both ends of the outer sleeve with screws. ? )
This is also possible. Note that it is preferable to provide the locking portion so that the locking portion does not come into contact with the shaft or the main body of the pusher 1 due to swinging of the shaft inserted into the pusher main body I. The outer sleeve according to the present invention is the same as the conventional outer sleeve except that the engaging portion 11 is vulcanized and bonded to the elastic body.

Examples will be described below.

Figure 1 shows a cross-sectional view of the bushing 1 with the elastic body of the tree.

First, the thickness is 1. A solid lubricant layer made of copper powder and fluororesin powder is formed on the surface of a 35 mm iron plate, and a long cedar board-shaped material is cut out and further processed into a ring shape to form a solid lubricant layer 11 on the inner surface. b') Inner diameter 24.7+n
Bush body 1 with an outer diameter of 27.7 mm and a length of approximately 20 mm.
Then, an adhesive is applied to the outer peripheral surface of the bushing S main body 1, and the molding process is completed. length 15
The -f elastic body 2 of 111 m was coated, and in this state (placed in a heating furnace and vulcanized, the ne f elastic body 2 was vulcanized and adhered to the outer circumference of the bushing body 1. Next, the inner diameter was 32 m3 and the outer 1' l 34
mm, length 20mm (1)':), steel ring 4
An outer sleeve material is used, and a reel 1 body 1 with a bullet bullet P1 body 2 joined to the outer peripheral surface is poured into this outer three material. 41 Both ends of the outer three 744 are drawn without '7', and ring-shaped engagement parts 11 and 32 are formed at both ends.
It was set as No. 7, Uta three, and 13.

The inner diameter of the tips of 1 thread 11 parts 31 and 32 is approximately 30+ nm
In this way, one bushi of the elastic body of the present invention was manufactured.

This elastic body is used for the outer sleeve 3.
The holding force of the elastic body 2 is 700 kg/kg.

A bushing having this elastic body is shown in Fig. 2 (bushing for supporting the steering rack) 10.The supporting device for this steering rack includes a rod-shaped rack 4 and a cylinder that houses the rack 4. A bushing 1 having an elastic body according to the present embodiment is interposed between a rank leakage/crusting 5 having a shape, a binion 6 that meshes with the rack 4, and a rack housing 5.
0, a mount rubber 8 interposed between the concave receiver (1 part 7) provided on the vehicle body side, and a Y-shaped metal fitting 9.The rack 4 is a rod with a circular cross section and a length of 1'. A tooth 41 is formed at the center of this axis (1) in the longitudinal direction. This rack 4 is held in a rack housing 5 via a bushing 110 having an elastic body according to this embodiment so as to be freely slidable in the axial direction. The elastic bodies 11014 are press-fitted into the ends of the rack housing 5, and the inner circumferential surface of the rack housing 5 and the outer circumferential surface of the outer sleeve of the six elastic bodies 110 are mechanically coupled. Also, the tip of the rack 4 is inserted into the main body of the rack 1 with an elastic body.

The mounts 1 to 8 are fitted into the outer peripheral surface of the rack housing 5, and in this state, the partially recessed concave receiver is placed with the mounts 1 to 8 semi-immersed in the part 7. - [From ゛l' circular shape 11 ↑ (19 is fixed to the concave receiving part 7 with a bolt, like 4°), and the elastic body of this example is Used in a support device for a 7-ring rack / j o Bush with elastic body of this example + 1 bush of about 10 tons + 41 11 method accuracy variation is small, so the bush body 1σ)
The maximum clearance between the inner diameter and the outside of rack 4 is approximately 45 mm.
In addition, this clearance was about 55 microns at maximum.The elasticity of this example is 1 bushing.
The support device for the steering gear using 10) is 7)
I have been able to make the lance as small as 55 microns at most, so I almost never order it.) I3. Furthermore, no particular increase in the pore force, which often occurs when the Uri 2 lance is small, was observed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a bushing having an elastic body according to an embodiment of the present invention, and FIG. is 1
1 In the figure, 1 is a bushing, 1 is a main body, 2 is an elastic body, and 33 is -j
7 Uta sleeve, 10 elastic body -) 1 shi 1, R+
t,, 1h revision Applicant: Daitoyo ■Gyo Co., Ltd. Kandai Sototo Patent Attorney 1 Hirotoshi Okawa Attorney 1! l! :'t, si valley shudou dialect p
111 Akio Maruyama Figure 1

Claims (1)

[Claims] (1) A cylindrical outer sleeve arranged concentrically with the 11 parts of the bush 1 main body, and a cylindrical cylinder interposed between the bush j main body and the bush 1 main body. In a Bushiko having an elastic body consisting of an elastic body, the outer circumferential surface of the second main body and the inner circumferential surface of the elastic body are in contact with each other. surface and 1-note] louta jl-”7, IFtl rfn is unjunctioned゛(-
contact, and the center axis I of the 7
A ring-shaped retainer 11 extending in the j direction is provided LJ, and the retainer 1
An I series with an elastic body characterized in that one part is configured to hold the elastic body? . (2) The main body of the brake 1 has a solid lubricant layer containing resin on the inner surface wrapped around the elastic body 1 and vulcanized.
C) One layer of elastic material according to claim 1.
fshi1. .