JPH0614096Y2 - Slip bushing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a sliding device used in a suspension device of a vehicle, for example, a suspension arm or a link, or a pivot part of a body connected to these arms. Bushing improvements.

(Prior Art) A suspension system of a vehicle is often used in which left and right wheels are independently suspended, and examples thereof include a double wishbone type and a multi-link type. In either configuration, bushings or ball joints are used for the suspension arms, the links, and the pivot portion of the body that connects them. The bushing includes a rubber bushing and a screw bushing, but a rubber bushing having the simplest shape and being inexpensive is often used.

This rubber bushing includes a rubber material made into a simple thick cylinder, or a rubber material vulcanized and bonded between an inner pipe and an outer pipe made of metal. The strain causes the inner pipe and the outer pipe to rotate relative to each other.

However, due to the layout, the above-mentioned suspension device cannot provide a sufficient length of the arm or the link, and is often shorter. Therefore, the twisting force applied to the rubber bushing becomes large. Depending on running conditions, an excessive twisting force may be applied, and if such a state is repeated and deterioration due to aging occurs, the rubber material may be twisted.

Therefore, in order to prevent the rubber material from being twisted, a sliding bushing is used in the pivot portion to which an excessive torsional force is frequently applied. This sliding bushing includes a sliding member having a low friction coefficient together with a rubber material, and when a twisting force of a predetermined value or more is applied, the sliding member performs a sliding action and absorbs the twisting force to prevent the rubber material from breaking.

FIG. 3 shows an example of a sliding bushing conventionally used. In the figure, reference numeral 1 denotes an inner pipe, collars 2 made of a metal material are fitted to both ends of the outer peripheral surface of the inner pipe 1, and a low friction coefficient such as an oil-impregnated resin material is provided between the collars 2 and 2. The sliding member 3 is provided. Oil seals 4 and 4 are fitted to the collars 2 and 2, and insert collar 5 is fitted to the oil seals 4 and 4 and the sliding member 3. A rubber material 6 is integrally vulcanized and bonded to the outer peripheral surface of the insert collar 5, and an outer pipe 7 is integrally vulcanized and bonded to the outer peripheral surface of the rubber material 6. When the sliding bushing configured as described above is used as an inner bushing at a connecting portion between an arm and a body, for example, a mounting hole is provided in the arm, the outer pipe 7 is inserted and fitted, and welding is performed. Stick and integrate. Then, a fixing bolt may be inserted into the inner pipe 1 from the one surface of the mounting portion of the body, and the tip may be projected from the other surface of the mounting portion to fasten the nut.

Therefore, the inner pipe 1 side and the outer pipe 7 side are respectively connected to the body and the arm, and the rubber material 6 between them is caused to perform relative rotation of the inner and outer pipes 1 and 7 due to the shear strain. Further, the friction characteristics of the sliding member 3 having a low friction coefficient cause the inner and outer pipes 1 and 7 to perform a sliding action.

(Problems to be solved by the invention) By the way, a vehicle equipped with a sliding bushing having such a structure may be exposed to muddy water as it travels. The oil seals 4 and 4 are provided to prevent the entry of muddy water so that the action of the muddy water is not impaired by the muddy water entering the fitting portion of the sliding member 3. Therefore, the function and effect are retained, but on the other hand, the cost of parts and the labor of mounting are increased, which adversely affects the cost. Further, since the sliding member 3 made of an oil-containing resin material is expensive, an inexpensive resin bearing may be used instead. In this case, the resin bearing must be installed in a predetermined portion before the rubber material 6 is vulcanized and adhered, and at this time, even if grease is injected to maintain smooth operation, the rubber material 6 is vulcanized and adhered. As a result, the grease characteristics may deteriorate. Furthermore, since the lubricating member 3, the insert collar 5, the rubber material 6 and the outer pipe 7 are fixedly assembled to the outer peripheral surface of the inner pipe 1 in this order, the next work is performed unless one fixing work is completed. It is not possible, and it takes time.

The present invention has been made in view of the above circumstances, and has a relatively simple structure, but it surely prevents the entry of muddy water and the like to improve the sealing property and is a sliding member made of an inexpensive resin bearing. It is an object of the present invention to provide a sliding bushing which can be used as a member, in which grease can be injected without impairing its characteristics, and which is easy to assemble.

[Constitution of device]

(Means for Solving the Problems) The present invention provides a sliding member on the outer peripheral surface of an inner pipe along at least a portion in the axial direction and covers the outer peripheral surface of the sliding member with a rubber material. The outer pipe is integrally fixed along the outer peripheral surface, and the sliding member is a material having a low friction coefficient, and the friction characteristics of the inner pipe and the outer pipe cause a sliding action. In the case where the pipe and the outer pipe are rotated relative to each other, the inner pipe and the rubber material are divided into two parts at substantially central portions in the axial direction, and the outer surfaces of the inner pipe and the outer peripheral surface of the inner pipe come in contact with each other in the axial direction. A certain rubber material is provided with fitting recesses to each other, and the sliding member is fitted into one fitting recess with a part thereof protruding, and the protruding portion is fitted to the other fitting recess. It is a sliding bushing characterized by being fitted and integrated.

(Operation) By constructing the sliding bushing in this manner, the sliding member is completely covered inside to prevent the entry of muddy water to ensure the sealing property, and the sliding member is assembled after the rubber material is vulcanized and bonded. Therefore, even if grease is injected into the peripheral surface of the sliding member, its characteristics are not impaired. Further, at the time of assembling, the sliding member forms a joint between the inner pipe and the rubber material, which is divided into two parts, and the assembling work is facilitated.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.
In FIG. 1, reference numeral 10 denotes an inner pipe, and a resin bearing 12 which is a sliding member surrounded by an insert collar 11 is provided at a substantially central portion of an outer peripheral surface of the inner pipe 10. A rubber material 13 is integrally fixed to the outer peripheral surface of the insert collar 11 and the outer peripheral surfaces of both ends of the inner pipe 10 by vulcanization adhesion. An outer cover 14 is concentrically integrally bonded to the outer peripheral surface of the rubber material 11 by vulcanization, and an outer pipe 15 is press-fitted into the outer cover 14 to form a sliding bushing.

To explain, such a slip bushing is
It is composed of dividers Sa and Sb and a resin bearing 12 (the outer pipe 16 is not shown) as shown in the figure. That is, the inner pipe 10, the rubber material 13, and the insert collar 11 are located at a substantially central portion in the axial direction.
The resin bearing 12 is divided, but is not divided, and has a cylindrical shape. From this, the rubber material dividers 13a, 13 which are on the outer peripheral surface side from the end surfaces of both inner pipe dividers 10a, 10b in contact with each other to the midway portion in the axial direction.
Fitting recesses 20a and 20b are formed in b. That is, the fitting recesses 20a, 20b are formed by the insert collar dividers 11a, 11b and the inner pipe dividers 10a, 10b.
It will be formed in a portion surrounded by b and. One of the split bodies, for example, the fitting recess 20a formed in Sa,
Approximately half of the resin bearing 12 is fitted, and the other half of the resin bearing 12 projects from the end surface of the divided body Sa.
Then, the protruding portion of the resin bearing 12 is fitted into the fitting recess 20b of the other divided body Sb. Finally, the outer pipe 15 shown in FIG.
A sliding bushing is obtained by fitting over 4a and 14b.

If the sliding bushing constructed in this manner is attached to a predetermined pivot portion as, for example, an inner bushing, the inner pipe 10 and the outer pipe 15 are caused to rotate relative to each other by the shear strain of the rubber material 13 and twisted. Absorbs. Even when the twist is extremely large, the resin bearing 12 as the sliding member is made of a material having a low friction coefficient, and therefore the inner pipe 10 and the outer pipe 15 are caused to perform a sliding action due to the frictional characteristics thereof to absorb the twist. Resin bearing 1 depending on driving conditions
Although a force is applied to No. 2, it has a high spring constant and is rigid, so it is not affected by it. Furthermore, since the rubber material 13 is partially vulcanized and adhered to the outer peripheral surfaces of both ends of the inner pipe 10, the limit angle in the torsion direction becomes large, and the spring constant becomes low and soft, so that the torsion torque decreases. effective.

Further, the resin bearing 12 is provided with the fitting recesses 20a, 2
Since it is inserted over 0b and the periphery thereof is bent by the inner pipe 10 and all other members, invasion of muddy water or the like to the peripheral surface of the resin bearing 12 is reliably prevented. Sliding member 1 that is a resin bearing for a long time without change over time
Secures the seal against 2.

When constructing such a sliding bushing, first, the inner pipe divider 10 is divided into respective parts.
a, 10b, insert collar dividers 11a, 11b, and outer cover dividers 14a, 14b by vulcanizing and adhering the rubber material dividers 13a, 13b.
b. Next, the resin bearing 12, which is a sliding member, is inserted into one fitting recess 20a and then fitted into the other fitting recess 20b. That is, the sliding member 12
Will be incorporated after the vulcanization and adhesion work to the rubber material 13, and even if grease is injected into this peripheral surface, its characteristics will not be impaired.

In the above embodiment, the resin bearing 12, which is a sliding member, is formed in a cylindrical shape, but the invention is not limited to this, and it may be partially provided at symmetrical positions in the circumferential direction.

[Effect of device]

As described above, according to the present invention, it is possible to use a sliding member, which is a resin bearing having a relatively simple structure and is inexpensive, which can reduce the cost and surely prevent muddy water from entering the sliding member. As a result, it is possible to improve the sealing performance, and it is also possible to inject grease into the peripheral surface of the sliding member, so that the assembly is simple and the workability can be improved.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention, FIG. 1 is a vertical side view of a sliding bushing, FIG. 2 is an exploded vertical side view thereof, and FIG. 3 shows a conventional example of the present invention. It is a vertical side view of a sliding bushing. 10 ... Inner pipe, 12 ... Sliding member (resin bearing), 13 ... Rubber material, 15 ... Outer pipe, Sa, Sb
... Split bodies, 20a, 20b ... Recesses for fitting.

Claims (1)

[Scope of utility model registration request] 1. A sliding member is provided on an outer peripheral surface of an inner pipe along at least a part in an axial direction, the outer peripheral surface of the sliding member is covered with a rubber material, and an outer pipe is integrally formed along the outer peripheral surface of the rubber material. The sliding member is a material having a low coefficient of friction, and its frictional characteristics cause the inner pipe and the outer pipe to perform a sliding action, and the rubber material causes the relative rotation between the inner pipe and the outer pipe due to the shear strain. In this case, the inner pipe and the rubber material are divided into two parts at substantially central portions in the axial direction, and the inner pipe and the rubber material are axially axially extended from the end surfaces of the two inner pipes, which are in contact with each other, into the fitting recesses. The sliding member is partly projected and fitted into one fitting recess, and this protruding part is fitted and integrated into the other fitting recess. Slip bushing to.