JPH073257B2 - Sliding rubber bush and method of manufacturing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle, which is interposed between members to be vibration-isolated and connected to suppress the transmission of vibration while absorbing an input in a twisting direction around an axis. The present invention relates to a sliding type rubber bush that can be suitably used as a suspension bush and the like, and a method for manufacturing the same.

BACKGROUND ART Conventionally, in a vehicle suspension mechanism or the like, a rod, an arm or the like is generally separated by a predetermined distance in a radial direction in order to swingably connect a rod or an arm to a member on a vehicle body side or a wheel side. A rubber bush having a structure in which an inner cylindrical metal member and an outer cylindrical metal member arranged concentrically are integrally connected by a cylindrical elastic member interposed therebetween is used. That is, in such a rubber bush, the elasticity of the elastic member absorbs the input vibration in the direction perpendicular to the axis, and the elastic deformation of the elastic member around the axis causes the relative deformation around the axis between the inner and outer tubular metal fittings. The target rotation is allowed.

However, in a rubber bush having such a structure, the rigidity in the axis-perpendicular direction and the torsional rigidity around the axis are simultaneously determined by the elasticity and shape of the elastic member. It has been difficult to tune the torsional rigidity around the center independently of each other according to the characteristics required for the bush. For that reason, as required for recent automobile suspension bushes, the rigidity in the direction perpendicular to the axis is increased to ensure good vehicle steering stability, while the torsional rigidity around the axis is lowered. It has been extremely difficult to improve the riding comfort of the vehicle.

Therefore, in recent years, Japanese Utility Model Laid-Open No. 60-3335 and Japanese Utility Model Laid-Open No. 62-1740 have been used.
As disclosed in Japanese Patent No. 9 and the like, a tubular race metal fitting is concentrically arranged on the outside of the shaft metal fitting, and is slidably fitted to the outer peripheral surface of the shaft metal fitting by the race metal fitting. While holding the resin sliding cylinder, by fixing a cylindrical rubber elastic body to the outer peripheral surface of such a race fitting, displacement in the twisting direction around the axis or in the twisting direction perpendicular to the axis can be achieved. There has been proposed a sliding type rubber bush having a structure in which it is allowed to slide by sliding between the outer peripheral surface of the shaft fitting and the inner peripheral surface of the sliding cylinder.

Further, the applicant of the present application has previously disclosed that, in Japanese Patent Laid-Open No. 62-8805, a sliding cylinder is formed by directly injection-filling a synthetic resin material between the shaft fitting and the race fitting. A sliding type rubber bush having a structure formed by forming is clarified. That is, in such a rubber bush, the sliding surface of the sliding cylinder can be made to correspond favorably to the shape of the shaft fitting, and the dimensional error of the shaft fitting and the race fitting is absorbed by the sliding cylinder. Therefore, excellent sliding performance can be stably obtained.

However, in all of the conventional sliding type rubber bushes, it is necessary to adhere a rubber elastic body to the outer peripheral surface of the race metal fitting, and sandblasting or shot blasting the race metal fitting. The rubber elastic body must be vulcanized and adhered to the outer peripheral surface of the race metal fitting after the surface is roughened and the adhesive is applied. However, there is a problem in that many steps and time are required, and the manufacturing cost becomes high.

Furthermore, when sandblasting or the like is performed on the race metal fittings, if the sliding surface or the fitting surface of the dust cover is roughened,
The sliding property and durability of the bush will be deteriorated, and when the adhesive is applied to the sliding surface and the fitting surface of the seal member, the sliding property and durability of the bush will deteriorate. Therefore, it is necessary to protect those parts by masking or the like, and therefore, the adhesion process of the rubber elastic body is extremely troublesome.

Further, in order to vulcanize and bond the rubber elastic body to the race metal fitting, usually, after the shaft metal fitting and the race metal fitting are assembled, the assembled body is used for forming a rubber elastic body. Since the rubber elastic body is molded by injecting the rubber material into the molding cavity formed on the outer peripheral surface side of the race fitting while being placed in the mold, the rubber material is molded. It was necessary to completely prevent the rubber from wrapping around to the sliding parts, etc., which required extremely high dimensional accuracy for the molding die of the rubber elastic body. Of.

(Problem to be Solved) Here, the present invention has been made in the background of the above circumstances, and the problem to be solved is to:
(EN) Provided is a sliding type rubber bush having an improved structure in which a rubber elastic body can be joined to the outer peripheral surface side of a race metal fitting easily with sufficient workability and with sufficient strength. Another object is to provide an advantageous method for manufacturing a rubber bush.

(Solution) In order to solve such a problem, in the present invention, (a) a shaft fitting having a sliding convex surface projecting outward on an outer peripheral surface of an axially intermediate portion; ) A cylindrical race fitting arranged concentrically outside the shaft fitting and having an inner peripheral surface opposed to the sliding convex surface of the shaft fitting at a predetermined distance in the radial direction, (c) ) Positioned across the inner peripheral surface side and the outer peripheral surface side of the race metal fitting and fixedly attached to the race metal fitting, on the inner peripheral surface side of the race metal fitting with respect to the sliding convex surface of the shaft metal fitting. A tubular sliding part having a sliding concave surface that is slidably fitted with a resin member that forms a joining part that spreads over a predetermined area on the outer peripheral surface side of the race metal fitting; The inner peripheral surface is arranged outside the race metal fitting, and the inner peripheral surface of the joint portion of the resin member is The sliding type rubber bush having a tubular rubber elastic body adhered to the outer peripheral surface is a feature thereof.

In the sliding rubber bush according to the present invention, for example, the sliding convex surface of the shaft fitting and the sliding concave surface of the sliding portion of the resin member are each formed in a spherical shape. As a result, as a so-called spherical sliding type rubber bush, it is possible to allow sliding around the bush axis and sliding in a direction inclined with respect to the bush axis between the sliding surfaces. Will be configured.

Alternatively, in the sliding type rubber bush according to the present invention, for example, the sliding convex surface in the shaft fitting and the sliding concave surface in the sliding portion of the resin member are respectively,
Since it is formed in a cylindrical surface shape, it can be advantageously configured as a so-called rotary sliding type rubber bush in which only sliding around the bush axis can be allowed between the sliding surfaces. Becomes

Further, in the present invention, a tubular sliding cloth made of a fiber material having a small sliding friction coefficient is arranged on the sliding concave surface of the sliding portion of the resin member, and is integrally fixed. The sliding type rubber bush is also a feature thereof.

Furthermore, the present invention is provided with a recess extending circumferentially in a central portion in the axial direction on the inner peripheral surface side of the rubber elastic body, and in the recess with respect to the joint portion of the resin member. The sliding type rubber bush in which the central portion in the axial direction of the rubber elastic body is made thinner than the both side portions in the axial direction due to the provision of the convex portion to enter,
That is the feature.

Furthermore, in the present invention, when manufacturing such a sliding type rubber bush, the shaft metal fitting and the race metal fitting are arranged in a predetermined molding die for forming the resin member, A molding space for forming the sliding portion is defined between the sliding convex surface of the shaft fitting and the inner peripheral surface of the race fitting, and the rubber elastic body is arranged outside the race fitting. At the very least, a molding space for forming the joint is defined between the outer peripheral surface of the race metal fitting and the inner peripheral surface of the rubber elastic body, and at the same time, a molding space for the joint metal is formed on the race metal fitting. A through hole for communicating the molding space with the molding space of the sliding portion is provided, and a predetermined synthetic resin material for forming the resin member is passed through between the race metal fitting and the rubber elastic body to bond the joint. Injection and filling into the molding space of the part At the same time, the synthetic resin material is introduced into the molding space of the sliding portion through a through hole provided in the race fitting to be filled therein, thereby forming the desired resin member and at the same time, forming the resin member. The method of manufacturing a sliding type rubber bush in which the rubber elastic body is adhered to the outer peripheral surface of is also a feature thereof.

(Examples) Hereinafter, in order to more specifically clarify the present invention, examples of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows a specific example of a sliding type rubber bush having a structure according to the present invention. As shown in this figure, in the sliding type rubber bush in the present embodiment, on the radially outer side of the shaft fitting 10 having a substantially cylindrical shape, a race fitting 12 having a substantially cylindrical shape as a whole, The rubber elastic body 14 having a substantially thick cylindrical shape is arranged concentrically with each other at a predetermined distance in the radial direction, and with respect to the race metal fitting 12, straddling the inner and outer peripheral surfaces thereof. In the positioned state, the resin member 15 is fixed.
The portion of the resin member 15 that is present on the inner peripheral surface side of the race metal fitting 12 constitutes a sliding portion 16 that slidably fits into the shaft metal fitting 10, while the resin member 15 Of the part that exists on the outer peripheral surface side of the race metal fitting 12,
A joint portion 18 fixed to the rubber elastic body 14 is configured.

More specifically, the shaft fitting 10 that constitutes such a sliding rubber bush has a cylindrical shape as a whole as shown in FIG. A spherical convex portion 24 having a spherical shape and projecting outward is integrally formed. The outer peripheral surface of the spherical convex portion 24 is a spherical sliding convex surface 26.

The race metal fittings 12 arranged outside the shaft metal fittings 10 are each composed of a pair of split cylindrical bodies 28, 28 having a substantially cylindrical shape. As shown in FIG. 3, the split cylindrical body 28 has an inner diameter larger than the outer diameter of the spherical convex portion 24 of the shaft fitting 10 by a predetermined dimension, and has an axially intermediate portion. An annular projecting piece 30 projecting radially inward at a predetermined height is integrally provided at the site.

Then, the pair of split cylinders 28, 28 are respectively externally inserted from both sides in the axial direction of the shaft fitting 10, and are combined so as to abut each other at one end face in the axial direction, so that at least the spherical shape of the shaft fitting 10 is obtained. It is formed in a cylindrical shape having a length capable of covering the outer peripheral surface of the convex portion 24, and is concentrically arranged on the outer side in the radial direction of the shaft fitting 10.

Further, the inner diameter of the race metal fitting 12 is larger than the outer diameter of the spherical convex portion 24 of the shaft metal fitting 10 by a predetermined dimension, so that the outer peripheral surface of the spherical convex portion 24 and the inner diameter of the race metal fitting 12 are increased. An annular space is formed between the annular surface and the peripheral surface, and both axial sides of the annular space are narrowed by the projecting pieces 30 to be substantially closed. In addition, in the split cylindrical bodies 28, 28 that form the race metal fitting 12, respectively,
A fitting groove 31 that is continuous in the circumferential direction and opens in an annular space formed between the spherical convex portion 24 and the race metal fitting 12 is formed, and the inside of the annular space is the outer peripheral side of the race metal fitting 12. Is formed with a through hole 32 that extends through the wall portion.

As shown in FIG. 4, the rubber elastic body 14 is preliminarily vulcanized and molded as a member separate from the shaft metal fitting 10 and the race metal fitting 12, and has a substantially thick wall as a whole. It has a cylindrical shape and is concentrically arranged on the outer side in the radial direction of the race metal fitting 12. A cylindrical mounting member 22 is vulcanized and adhered to the outer peripheral surface of the rubber elastic body 14.

The rubber elastic body 14 has an inner diameter larger than the outer diameter of the race metal fitting 12 by a predetermined dimension, whereby the outer peripheral surface of the race metal fitting 12 and the rubber elastic body 14 are made larger.
An annular space is formed between the inner peripheral surface of 14 and the inner peripheral surface of 14. Further, on the inner peripheral surface of the rubber elastic body 14, a recess 34 having a substantially spherical concave surface and continuously extending in the circumferential direction is formed at the central portion in the axial direction. The rubber elastic body 14 is thin. Furthermore, on both axial end surfaces of the rubber elastic body 14, concave grooves 36 each having a substantially semicircular shape and extending in the circumferential direction are provided.

Further, of the resin member 15 fixed to the race metal fitting 12, the sliding portion 16 located on the inner peripheral surface side of the race metal fitting 12 has a substantially annular or cylindrical shape. ,
It is arranged in an annular space formed between the spherical convex portion 24 and the race fitting 12, and is interposed between the sliding convex surface 26 of the spherical convex portion 24 and the inner peripheral surface of the race fitting 12. ing. And
The outer peripheral surface of the sliding portion 16 is fitted and fixed in a fitting groove 31 formed in the inner peripheral surface of the race fitting 12, while the inner peripheral surface of the sliding portion 16 has a spherical convex portion 24. With respect to the sliding convex surface 26, the sliding concave surface 38 is positioned with a slight clearance, and the spherical convex portion 24 is held so as to be spherically slidable. Further, the sliding portion 16 integrally has, on the inner peripheral surface side thereof, a cylindrical sliding cloth 39 fixed so as to cover the entire inner peripheral surface. The moving cloth 39 constitutes the sliding concave surface 38.

On the other hand, the joint portion 18 positioned on the outer peripheral surface side of the race metal fitting 12 has a substantially cylindrical shape, and has an annular space formed between the race metal fitting 12 and the rubber elastic body 14. A rubber elastic body disposed inside the race fitting 12 and the outer peripheral surface of the race fitting 12.
It is inserted between the inner peripheral surface of 14. The joint portion 18 has its inner peripheral surface fixed to the outer peripheral surface of the race fitting 12, while its outer peripheral surface is adhered to the inner peripheral surface of the rubber elastic body 14. The rubber elastic body 14 is joined to the race metal fitting 12. Further, the joint portion 18 is integrally formed with a convex portion 40 that protrudes outward in the radial direction and fits into the recess 34 of the rubber elastic body 14 at the central portion in the axial direction.

Further, here, the sliding portion 16 and the joint portion 18,
Connected through the through hole 32 provided in the race metal fitting 12,
It is configured as an integral resin member 15, whereby the sliding portion 16 and the joint portion 18 are mechanically (shapeally) firmly fixed to the race metal fitting 12, and at the same time, the race metal fitting 12 is formed. That is, the divided cylindrical bodies 28, 28 constituting the above are integrally connected.

Furthermore, an annular rubber dust cover 41 is mounted between both axial end portions of the shaft metal fitting 10 and the race metal fitting 12, and the sliding convex surface 26 of the spherical convex portion 24 of the shaft metal fitting 10 is mounted. It is possible to prevent dust and muddy water from entering between the sliding surfaces between the sliding concave surface 38 of the sliding portion 16 and the sliding concave surface 38.

By the way, in the sliding type rubber bush having such a structure, when the resin member 15 is formed, for example, the following manufacturing method is preferably adopted.

First, as shown in FIG. 5, after the split cylinders 28, 28 constituting the race metal fitting 12 are respectively externally inserted from both axial sides of the shaft metal fitting 10, the shaft metal fitting 10 and the split metal cylinders are divided.
28, 28, a predetermined molding die 42 for forming a resin member
Rubber elastic body housed inside and separately vulcanized and molded
14 are housed and arranged outside the split cylindrical bodies 28, 28, and the shaft metal fitting 10, the race metal fitting 12 and the rubber elastic body 14 are arranged.
Are held and set concentrically with each other by the lower mold 44 and the upper molds 46 and 48. That is, under such a set state,
A molding space 56 for forming the sliding portion 16 is formed between the spherical convex portion 24 of the shaft metal fitting 10 and the split cylindrical bodies 28, 28, and the split cylindrical bodies 28, 28 and the rubber elastic body 14 are formed. A molding space 54 for forming the joint portion 18 is defined therebetween.

At this time, the sliding cloth 39 is externally arranged on the outer peripheral surface of the spherical convex portion 24 of the shaft fitting 10. The sliding cloth 39 is made of a low-friction material such as polyfluorinated ethylene fiber and has a denier of about 100 to 10,000 denier and 20 per inch.
A material woven with a density of about 200 yarns is preferably used. Further, as the sliding cloth 39, a polyfluorinated ethylene-based fiber on the inner peripheral surface side, a polyester-based fiber on the outer peripheral surface side, a double woven fabric woven so as to appear, or a woven fabric, If an adhesive treatment using a phenol resin, an epoxy resin, or the like, or a material impregnated with a nylon resin or the like is used, bonding with a resin material described later can be performed more reliably and firmly.

Furthermore, it is desirable that an appropriate adhesive, for example, a Chemlock adhesive, be applied in advance to the inner peripheral surface of the rubber elastic body 14 for bonding with a resin material described later. In addition, in the divided cylindrical bodies 28, 28, since the bonding with the resin material is mechanically (shapewise) performed, a special bonding process is not always necessary.

Then, under such a state, as shown in FIG. 6, a predetermined resin material 50 forming the resin member 15 is passed through the sprue 52 of the molding die 42 and the split cylindrical bodies 28, 28 and the rubber elastic body. A molding space 54 formed between 14 and 14 is injected and filled from one axial side thereof. That is,
The resin material 50 fills the molding space 54, and further, through the through holes 32 of each divided cylindrical body 28, the divided cylindrical body 28 and the shaft fitting.
It is guided into the molding space 56 formed between the ten spherical projections 24 and filled in the molding space 56.

Incidentally, as the resin material 50, various thermoplastic or thermosetting synthetic resins including nylon can be adopted, but the mechanical strength of the obtained resin member 15 is ensured, and the bush is formed. In order to improve the load-carrying performance of, a fiber-reinforced resin mixed with glass fiber, carbon fiber, aromatic polyamide (Kevlar) fiber, etc. is preferably used.

The resin member 15 as described above is formed by such an injection molding operation of the resin material 50, the joint portion 18 is formed in the molding space 54, and the sliding portion 16 is formed in the molding space 56. Also there, these joints
The sliding portion 16 and the sliding portion 16 are integrally formed through a through hole 32 provided in each divided cylindrical body 28, and the sliding portion 16 is fitted on the inner peripheral surface of each divided cylindrical body 28. Since it will be fitted in the mating groove 31, at the same time as the molding, the joint 18
The divided metal pipes 28, 28 are connected and integrated by the sliding portion 16 to form the race fitting 12, and the joint portion 18 and the sliding portion 16 are respectively connected to the divided metal pipes 28, 28. It is firmly fixed to the inner and outer peripheral surfaces.

Further, when forming the sliding portion 16 and the joint portion 18,
At the same time as the inner peripheral surface of the sliding portion 16 is formed, the sliding cloth 39 is provided with heat of the resin material 50, injection pressure and sliding cloth 39.
On the outer peripheral surface of the joint portion 18, the dust elastic body 14 is formed simultaneously with the heat of the resin material 50 and the inner peripheral surface of the rubber elastic body 14 while being fixed integrally by an adhesive or the like applied to the. The adhesive applied to the surface makes them adhere integrally.

Then, in the sliding portion 16, since the outer peripheral surface of the sliding portion 16 is fixed to the inner peripheral surface of the race metal fitting 12, contraction due to cooling and solidification is caused. It is generated on the inner peripheral surface side as if it is pulled by the metal fitting 12, so that between the inner peripheral surface (sliding concave surface) 38 of the sliding portion 16 and the outer peripheral surface (sliding convex surface) 26 of the shaft metal fitting 10. In addition, a uniform and small clearance can be formed.

And, in the sliding type rubber bush having the above-mentioned structure, although not shown, one member to be vibration-proof coupled is inserted and fixed in the inner hole 20 of the shaft fitting 10. On the other hand, the cylindrical mounting member 22 fixed to the outer peripheral surface of the rubber elastic body 14 is press-fitted and fixed to the other member to be vibration-isolated and connected, whereby the vibration-proofing is performed. Both members to be coupled are vibration-proof coupled to each other so as to be swingable or rotatable with respect to each other around the bush axis and in a direction inclined with respect to the bush axis.

Here, in the sliding type rubber bush configured as described above, the rubber elastic body 14 is adhered to the race metal fitting 12 by the bonding portion 18 fixed on the outer peripheral surface of the race metal fitting 12.
Therefore, it is not necessary to subject the race metal fitting 12 to surface roughening such as sandblasting in order to adhere the rubber elastic body 14 because the rubber elastic body 14 is adhered, and the man-hours and the work for manufacturing the bush can be reduced. Remarkable simplification can be achieved, and problems such as obstruction of slidability resulting from such roughening can be completely avoided.

Further, in the joint portion 18, since it is composed of the resin member 15 integrated with the sliding portion 16 positioned on the inner peripheral surface side of the race metal fitting 12, Without applying special adhesion treatment to the race metal fittings 12
It is possible to advantageously obtain the fixing strength with respect to.

Furthermore, in the sliding type rubber bush in the present embodiment, since the sliding cloth 39 is arranged on the inner peripheral surface of the sliding portion 16 forming the sliding concave surface 38, the sliding concave surface The sliding portion 16 (resin member 1
As the forming material of 5), a fiber reinforced resin having inferior slidability can be adopted, and thereby excellent load bearing performance can be exhibited.

Further, in the sliding type rubber bush in the present embodiment, at the central portion in the axial direction of the joint portion 18, the convex portion 40 that protrudes outward and enters the concave portion 34 provided in the rubber elastic body 14.
Therefore, by adjusting the protruding height, size, etc. of the convex portion 40, the spring ratio between the axial direction and the axial direction or the prying direction in the obtained rubber bush can be appropriately tuned. It also has the advantage of being able to do so.

Furthermore, if the resin member 15 constituting such a sliding portion 16 and the joint portion 18 is formed according to the method as described above, at the same time when the resin member 15 is formed, the split cylindrical bodies 28, 28 are formed. The race fitting 12 can be configured by being connected and integrated, and
The sliding portion 16 and the joint portion 18 are fixed to the race metal fitting 12, further, a sliding surface is formed between the sliding portion 16 and the shaft metal fitting 10, and the joint portion 18 and the rubber elastic body 14 are fixed. It can be advantageously performed with extremely excellent workability.

Further, if the resin member 15 is formed in this way, at the same time as the formation, it is possible to exert a precompression on the rubber elastic body 14 by the injection pressure of the resin member 50. There is also an advantage that is unnecessary. At that time, as shown in FIG. 5, by the groove 36 provided on both axial end surfaces of the rubber elastic body 14,
If the escape space is secured when the rubber elastic body 14 is deformed by the injection pressure of the resin, the pre-compression of the rubber elastic body 14 can be more effectively exerted.

Furthermore, according to the manufacturing means as described above, the race fitting 12
Since the rubber elastic body 14 to be joined to the rubber elastic body 14 can be pre-vulcanized and molded in a separate step, the molding die of the rubber elastic body 14 may be required to have such high dimensional accuracy. There is no.

Although the embodiments of the present invention have been described above in detail, this is a literal example, and the present invention is directed to a specific structure of the sliding rubber bush shown in the embodiments and a specific manufacturing method thereof. However, it should not be construed as limiting.

For example, in the above embodiment, the race metal fitting 12 is composed of a pair of divided cylinders 28, 28, which are connected by the resin member 15, but these divided cylinders 28,
28 may be integrated by a screwing structure or the like,
Furthermore, as shown in FIG.
The 12 may be configured as an integral cylindrical body in which a pair of annular resin stoppers 60, 60 are fitted and fixed on the inner peripheral surfaces on both sides in the axial direction. In addition, the seventh
In the drawings, in order to facilitate the understanding thereof, the same reference numerals are respectively attached to the members and parts having the same structures as those in the above-described embodiment.

Further, in the above embodiment, the sliding convex surface 26 of the shaft metal fitting 10 is
The sliding concave surface 38 in the sliding portion 16 and the sliding concave surface 38 are each formed in a spherical shape, a so-called spherical sliding type rubber bush, one specific example of applying the present invention, In addition, for example, the sliding convex surface of the shaft fitting and the sliding concave surface of the sliding portion are each formed in a cylindrical surface shape, and only sliding around the bush axis can be allowed between the sliding surfaces. The present invention can be similarly applied to a so-called rotary sliding type rubber bush thus configured.

Further, it is not always necessary to dispose the sliding cloth 39 on the inner peripheral surface of the sliding portion 16.

Furthermore, a recess 34 formed in the central portion in the axial direction of the rubber elastic body 14 into which the projection 40 provided in the joint portion 18 is inserted.
Is provided according to the spring characteristics required for the rubber bush, and does not necessarily have to be provided.

In addition, the mounting bracket 22 fixed to the outer peripheral surface of the rubber elastic body 14
Is not essential to the present invention. For example, such a rubber elastic body 14 may be directly fitted and mounted in a mounting hole such as an arm eye provided in a suspension rod of an automobile.

Further, the method of forming the resin member 15 is not limited to the method of the above-described embodiment, and for example, the race fitting 12
By providing an injection hole penetrating the protruding piece 30 of the (split cylinder 28) in the axial direction and injecting a resin material from the injection hole,
It is also possible to wrap around the molding space 56 of the sliding portion 16 into the molding space 54 of the joint portion 18 or to fill it, or to provide an injection hole penetrating the rubber elastic body 14 in the radial direction, and the injection hole is formed. By injecting resin material from the
It is also possible to wrap around the molding space 56 of the sliding portion 16 from inside 54 and fill it.

In addition, although not enumerated one by one, the present invention can be carried out in various modified, modified, and improved modes based on the knowledge of those skilled in the art. It goes without saying that all of them are included in the scope of the present invention without departing from the spirit of the invention.

(Effects of the Invention) As is apparent from the above description, in the sliding type rubber bush constructed according to the present invention, the rubber elastic body is joined to the outer peripheral surface of the race fitting on the outer peripheral surface of the race fitting. Since it is done through the joint part fixed to the, it is not necessary to apply bonding treatment such as sandblast to the race metal fitting when joining the rubber elastic body, which reduces man-hours and significantly simplifies work when manufacturing the bush. This can be achieved, and problems such as obstruction of slidability due to such roughening can be completely avoided.

Further, in the sliding type rubber bush according to the present invention, in which the sliding cloth is fixed on the inner peripheral surface of the sliding portion forming the sliding concave surface, the sliding property on the sliding concave surface is sufficient. It is possible to employ a fiber reinforced resin as a material for forming the sliding portion while ensuring the above, and thereby excellent load resistance performance can be exhibited.

Furthermore, in the sliding type rubber bush according to the present invention, a convex portion that protrudes outward and enters a concave portion provided on the inner peripheral surface of the rubber elastic body is formed at the central portion of the joint portion in the axial direction. In this case, the spring ratio between the direction perpendicular to the axis and the axial direction or the twisting direction in the rubber bush can be easily tuned by adjusting the protruding height and size of the convex portion.

Furthermore, according to the method of the present invention, the resin member can be advantageously formed over the inner and outer peripheral surfaces of the race fitting, and at the same time as the formation of the resin member, the fixing of the sliding portion and the joint portion to the race fitting, Further, the formation of the sliding surface between the sliding portion and the shaft fitting and the fixing of the joint portion and the rubber elastic body 14 can be advantageously performed with extremely excellent workability.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a sliding type rubber bush having a structure according to the present invention. FIG. 2 is a side view showing a shaft fitting which constitutes the sliding rubber bush shown in FIG. FIG. 3 is a vertical cross-sectional view showing a divided cylindrical body which constitutes the sliding type rubber bush shown in FIG. FIG. 4 is a vertical cross-sectional view showing a rubber elastic body forming the sliding type rubber bush shown in FIG. Fifth
FIG. 6 and FIG. 6 are process explanatory views for explaining the method for manufacturing the sliding rubber bush shown in FIG. 1, respectively. FIG. 7 is a longitudinal sectional view corresponding to FIG. 1, showing another embodiment of a sliding type rubber bush having a structure according to the present invention. 10: Shaft bracket, 12: Race bracket 14: Rubber elastic body, 15: Resin member 16: Sliding part, 18: Joining part 24: Spherical convex part, 26: Sliding convex surface 28: Split cylinder, 34: Recess 38: Sliding concave surface, 39: Sliding cloth 40: Convex part, 42: Mold for molding 50: Resin material 54: Molding space for joining part 56: Molding space for sliding part

Claims (6)

[Claims] 1. A shaft fitting having a sliding convex surface projecting outward on an outer peripheral surface of an intermediate portion in an axial direction, and a shaft fitting disposed concentrically on the outer side of the shaft fitting and having an inner peripheral surface. A cylindrical race metal fitting that is opposed to the sliding convex surface of the race metal at a predetermined distance in the radial direction, and is located across the inner peripheral surface side and the outer peripheral surface side of the race metal fitting, and On the inner peripheral surface side of the race fitting, a tubular sliding portion having a sliding concave surface slidably fitted to the sliding convex surface of the shaft fitting is formed, On the outer peripheral surface side of the race metal fitting, a resin member that constitutes a joint portion that spreads in a predetermined area, and an inner peripheral surface that is arranged outside the race metal fitting,
A tubular rubber elastic body adhered to the outer peripheral surface of the joint portion of the resin member, the sliding rubber bush. 2. A bush shaft center is formed between the sliding surfaces of the shaft metal fitting and the sliding concave surface of the resin member by the spherical shape. The sliding type rubber bush according to claim 1, wherein the sliding around and the sliding in a direction inclined with respect to the bush axis are allowed. 3. The bushing shaft is formed between the sliding surfaces of the shaft metal fitting and the sliding concave surface of the sliding portion of the resin member, which are formed in a cylindrical shape. The sliding rubber bush according to claim 1, wherein only sliding around the center is allowed. 4. A tubular sliding cloth made of a fibrous material having a small sliding friction coefficient is disposed on the sliding concave surface of the sliding portion of the resin member and integrally fixed thereto. The sliding rubber bush according to any one of 1) to (3). 5. An inner peripheral surface side of the rubber elastic body is provided with a recess extending in a circumferential direction at a central portion in the axial direction, and a protrusion which enters the recess with respect to a joint portion of the resin member. The sliding type according to any one of claims (1) to (4), wherein the central portion in the axial direction of the rubber elastic body is made thinner than the both side portions in the axial direction by providing the portion. Rubber bush. 6. The shaft fitting and the race fitting are arranged in a predetermined molding die for forming the resin member, and the sliding convex surface of the shaft fitting and the inner peripheral surface of the race fitting are arranged. While defining a molding space for forming the sliding portion, the rubber elastic body is disposed outside the race metal fitting, and the outer peripheral surface of the race metal fitting and the rubber elastic body are formed. A through hole that defines a molding space for forming the joint portion between the inner peripheral surface and the race fitting and allows the molding space of the joint portion to communicate with the molding space of the sliding portion. And injecting a predetermined synthetic resin material for forming the resin member into the molding space of the joint through the race metal fitting and the rubber elastic body.
At the same time as filling, the synthetic resin material is guided into the molding space of the sliding portion through a through hole provided in the race metal fitting so as to be filled, and at the same time, the desired resin member is formed and at the same time The method for manufacturing a sliding rubber bush according to claim 1, wherein the rubber elastic body is adhered to the outer peripheral surface of the member.