JPH0614095Y2 - 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 outer tab bushing at a connecting portion between arms, for example, one arm is provided with a mounting hole, the outer pipe 7 is inserted and fitted, and welding is performed by means such as welding. Stick and integrate. Then, the fixing bolt may be inserted into the inner pipe 1 from the one surface of the mounting portion of the other arm, 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. When the sliding bushing is used as the outer bushing, for example, the twisting directions of the arms are not constant, and therefore it is convenient that the sliding member 3 can swing in the direction perpendicular to the axis. However, the conventional cylindrical sliding member 3 has a very small degree of freedom in that direction and lacks smoothness. 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, has a configuration optimal for use as, for example, an outer tubing, and 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 a structure in which a pipe and an 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 peripheral surface side along the axial direction from the end surfaces of the inner pipes that abut each other. The rubber member is provided with a fitting recess having a largest diameter on the contact end face side and having a hemispherical outer peripheral cross section whose diameter gradually decreases along the end. It has a large diameter and is formed into a substantially spherical outer cross-section with a diameter that gradually decreases along both ends. One half of the fitting recess is fitted into the one fitting recess and the other half is projected, and this projection The sliding bushing is characterized in that it is fitted and integrated into the other fitting recess.

(Operation) By configuring the sliding bushing in this manner, the sliding member is completely covered inside to prevent the entry of muddy water and ensure the sealing performance, and the fitting surface of the sliding member and the fitting recess is Since it has a substantially spherical cross section, the degree of freedom of swinging in the axial direction becomes extremely large, and since the sliding member will be assembled after vulcanization and adhesion of the rubber material, grease should be injected into the peripheral surface of the sliding member. However, its characteristics are not damaged. 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 an insert collar 11 is provided at a substantially central portion of an outer peripheral surface of the inner pipe 10. The insert collar 11 has the largest diameter in the substantially central portion and is bent into a substantially spherical shape in which the diameter is gradually reduced toward both ends, and a resin bearing 12 as a sliding member is bent around this. It Therefore, the resin bearing 12
The outer peripheral surface side is formed into a substantially spherical shape. 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 and integrally vulcanized and bonded to the outer peripheral surface of the rubber material 13.
The outer pipe 15 is press-fitted into the slide bushing.

To explain, such a slip bushing is
It is composed of divided bodies Sa and Sb as shown in the figure and a resin bearing 12 (the outer pipe 16 is not shown). 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 and has a deformed cylindrical shape in which the outer peripheral surface side which is not divided is substantially spherical. From this, from the end surfaces of both inner pipe dividers 10a, 10b in contact with each other to the midway portion in the axial direction, the recesses 20a, 20b for fitting are fitted in the rubber material dividers 13a, 13b on the outer peripheral surface side thereof.
Is formed. That is, the fitting recesses 20a, 20b
Is formed in a portion surrounded by the insert collar dividers 11a and 11b and the inner pipe dividers 10a and 10b, and the abutment end surface sides of the dividers Sa and Sb have the largest diameter and face toward the ends. It is formed in a substantially hemispherical cross-section with a gradually decreasing diameter. A substantially half portion of the resin bearing 12 is fitted into the fitting recess 20a formed on one of the divided bodies Sa, and the other half portion 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 1 shown only in FIG.
A sliding bushing is obtained by fitting 5 into the outer cover dividers 14a 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.

When such a sliding bushing is used as, for example, an outer bushing, the fitting surfaces of the resin bearing 12 and the fitting recess 20 are formed into a substantially spherical shape even if the swing angles of the arms connected via the sliding bushing are large. As a result, the swing range in the direction perpendicular to the axis is expanded, and smooth movement of the arms is ensured.

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.

[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. It is possible to improve the sealing property. Furthermore, the swing range in the direction perpendicular to the axis is expanded,
For example, even when it is used as an outer bushing, an extremely smooth operation can be ensured, and it is possible to inject grease to the peripheral surface of the sliding member, so that the assembly is easy 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 a 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 end surfaces of the both inner pipes that come into contact with the rubber material on the outer peripheral surface side along the axial direction from the end surfaces that abut each other. A fitting recess having a substantially hemispherical outer peripheral cross section, which has the largest diameter on the side and is gradually reduced along the end, is provided, and the sliding member has the largest diameter at the substantially central part and extends along both ends. Is formed into a substantially spherical outer cross-section with a gradually decreasing diameter, and approximately half of the fitting recess is fitted into the one fitting recess and the other half is projected, and this projection is fitted into the other fitting recess. A sliding bushing characterized by being integrated into one.