JP2759613B2 - Bearing member and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing member which is inserted between a rotating or sliding shaft and a housing for supporting the shaft.

[0002]

2. Description of the Related Art There has been known a bearing member for rotating or sliding, in which an inner peripheral surface which is in sliding contact with a shaft is made of a fluororesin and rubber is coated on an outer periphery thereof. This kind of bearing member is formed by winding a sheet-shaped fluororesin 51 around a core rod 52 once as shown in FIGS. 9 and 10 because the fluororesin is expensive. A rubber sheet 53 is wound around the outer periphery of the fluororesin 51, which is mounted in a mold and vulcanized.

[0003] As described above, the fluorocarbon resin 51 is
In consideration of the characteristic that the fluororesin is softened and stretched when heated when it is wound around the sheet 2, the sheet-like fluororesin 51 is usually wound once when the sheet-like fluororesin 51 is wound once.
The two end portions are wound with a small gap 54 (see FIG. 10), but when the gap is large, a gap 55 is formed in the axial direction of the fluororesin which becomes the inner peripheral surface after molding (see FIG. 11).
If the gap is small, overlapping portions 56 will be formed at both ends of the fluororesin 51 which will be the inner peripheral surface after molding (see FIG. 12). In addition, instead of winding the sheet-like fluororesin 51 around the core rod 52 once and winding the rubber around the outer periphery, there is also a method of squeezing the fluororesin into a rubber cylinder. The diameter and height (length) were limited, and the types of products were limited and unusual.

As described above, if the axial gap 55 is formed in the fluororesin which is the inner peripheral surface of the bearing member, the inner diameter of the bearing member changes when the bearing member is mounted on the housing. However, since the friction coefficient is different between the fluororesin and the rubber, if the shaft comes into contact with the rubber, the friction will vary, and the abrasion powder of the rubber will enter the inner peripheral surface to promote the abrasion. Even if there is no gap in the axial direction, the presence of a seam is inevitable, and such a seam or the like gives directionality to the contact surface with the shaft. May be separated from the overlapping portion 56.

Accordingly, the present invention solves the above-mentioned problems and eliminates the seams, gaps, and the like of the fluororesin, which is the inner peripheral surface of the bearing member, so that the contact surface with the shaft does not have directivity and friction is reduced. It is an object of the present invention to provide a bearing member with little change in durability and improved durability and a method for manufacturing the same.

[0006]

Means for Solving the Problems In order to achieve the above object, a bearing member according to the present invention is provided around the entire surface of a core rod.
A plurality of corrugated portions are formed, and a core on which the corrugated portions are formed.
The rod was fitted with a fluororesin tube and fitted on the core rod
Rubber is coated on the outer circumference of the fluororesin tube and vulcanized with a mold
And integrate the fluororesin tube and rubber
Along with the entire circumference of the inner surface of the fluororesin tube
Characterized by forming a plurality of corrugated portions.
Instead of the wavy part on the surface of the core rod,
Form a large number of grooves, radial direction on the inner peripheral surface of the fluororesin tube
Are formed. And the product
As a fabrication method, use a fluororesin tube with a smooth surface.
Or fitted to the processed core rod, and then to the core rod
The outer circumference of the fluorinated resin tube covered with rubber
Upper and lower dies with grooves formed in the longitudinal direction of the inner circumference
And then vulcanizing.
The fluororesin tube and rubber are integrally bonded
After vulcanization, cut to a predetermined length in the axial direction and remove from the core rod.
Is characterized by the fact that

[0007]

In the bearing member according to the present invention, the fluororesin tube is fitted on the core rod, the outer periphery of the fluororesin tube fitted on the core rod is coated with rubber, and this is vulcanized in a mold. Molded and integrated with the fluororesin tube at the inner diameter and the rubber at the outer diameter, there is no seam or the like in the fluororesin that forms the inner peripheral surface of the bearing member that slides with the shaft. Since it does not have directionality on the contact surface with the shaft, it can be used for either rotation or sliding. Especially when it is used for sliding, any part of the inner surface is loaded. Also obtained a stable friction,
Since the fluororesin tube is used, the length and diameter can be freely selected.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. Figure
1 and 2 show a bearing member 1 manufactured by the manufacturing method of the present invention. The inner diameter portion of the bearing member 1 is made of a tubular fluororesin 2 and the outer diameter portion thereof is integrally formed with rubber 3. It has been vulcanized. Further, the rubber 3 of the outer diameter portion described above is used.
Are provided in the axial direction on the entire circumference of the surface. And, the above-mentioned grooves 4, 4, 4, 4, ...
Is provided, when the bearing member 1 is inserted into a housing (not shown), the bearing member 1
(1) The variation in outer diameter can be absorbed.

[0009] be described with reference to examples of the manufacturing method of the shaft receiving member 1 described above in <br/> FIGS. 3 to 5, first, fitted a tubular fluororesin 2 to core rod 6, the A sheet-like rubber 7 is wound around the outer periphery, and is mounted in a mold 8 composed of an upper mold 8a and a lower mold 8b having a groove formed in the longitudinal direction of the inner periphery, and vulcanization-molded. 2 and rubber are integrally bonded by vulcanization. In the above-mentioned mold 8, three bearing members 1 can be formed simultaneously in series. Also, the mold
In FIG. 8, a flange portion 5 at the end of the bearing member 1 can be formed. After the vulcanization molding, the flange portion 5 is taken out from the mold 8 and one of the bearing members 1 is cut by the cutter 9 from the flange portion 5.

[0010] bearing member 1 fabricated by the manufacturing method described above, the inner peripheral portion as described above is formed by a tube-shaped fluororesin 2, axial grooves on the outer circumferential surface as the outer diameter 4, 4 Since the rubber 3 provided with,... Is provided, even if the groove 4, 4, 4,. Not only can be easily inserted, but also because the inner peripheral surface of the bearing member 1 is formed of a tube-like fluororesin 2, there is no seam on the inner peripheral surface, so the contact surface with the shaft Since it has no directionality, the change in friction is small and the durability can be improved. In particular, when used for sliding, the friction is stabilized even if a load is applied to any position on the inner surface. In addition, since there is no seam, there is rigidity on the inner surface, and there is little dimensional change in the inner diameter after mounting on the housing.Furthermore, since the inner diameter portion is a fluororesin tube, the diameter and length of the bearing member 1 can be freely adjusted. You can choose.

FIG. 7 shows a first embodiment of a bearing member according to the present invention. In the first embodiment, corrugated portions 11 1, 11 1, 11 1 are formed on the entire circumference of a fluororesin tube 10 having an inner diameter. , ・ ・ ・
Is formed, and the wavy portion 11 1, 1 1, 1
Are formed to extend in the axial direction. In order to form the wavy portions 11 1, 11 1, 11 1, ..., the wavy portions are formed around the entire circumference of the core rod. The corrugated portion is extended in the axial direction, and a tube-shaped fluororesin 10 is fitted on a core rod formed on the entire periphery, and a sheet-like rubber is wound around the outer periphery thereof, and is placed in a mold. By mounting and vulcanizing, the inner peripheral portion of the fluororesin is formed as corrugated portions 11, 11, 11,....

In the first embodiment of the bearing member described above, since the inner peripheral portion of the fluororesin 10 is formed in a wavy shape, the sliding contact with the shaft is reduced, and the friction can be stabilized.
Also, the change in sliding resistance can be suppressed to a small width,
Further, when the shaft is fitted, the undulations can absorb dimensional variations. Further, in the first embodiment, when dust or the like enters the concave portion of the corrugated portion, wear can be reduced. When there is a variation in the dimensions of the fluororesin tube itself, a gap is formed between the core rod and the tube, which tends to wrinkle during molding. However, by forming the corrugated portion, the wrinkles described above can be avoided.

FIG. 8 shows a second embodiment of the bearing member of the present invention. In this second embodiment, a large number of independent or spiral grooves 14 are radially provided on the inner periphery of a fluororesin 13. , 1
,... Are formed. In order to form the radial grooves 14, 14,..., A number of circumferential grooves are formed on the outer periphery of the core rod, and the circumferential grooves are formed on the core rod having the outer periphery formed by a tube. -Shaped fluororesin 13 is fitted, and a sheet-like rubber is wound around the outer periphery in the same manner as described above,
By mounting in a mold and vulcanizing, a large number of radial grooves 14, 14,... Described above can be formed on the inner periphery of the fluororesin.

The above-described second embodiment of the bearing member is suitable for use as a bearing member for rotation, and is provided on the shaft by the presence of radial grooves 14, 14,... On the inner periphery of the bearing member. When the fitting is performed, variations in the dimensions of the bearing members can be absorbed, and the friction can be stabilized even when the shaft is rotated.

In each of the above-described embodiments, it has been described that a tube-shaped fluororesin is fitted on a core rod, a sheet-shaped rubber is wound around its outer periphery, and this is mounted on a mold and vulcanized. The rubber is not limited to this, and the rubber may of course be vulcanized and formed by coating the outer periphery of the fluororesin with a pipe-shaped rubber formed by extrusion.

[0016]

According to the bearing member of the present invention, since the inner peripheral surface of the bearing member is formed of a tubular fluororesin,
Since seam like the fluororesin in contact with the shaft is not present at all the change in friction is obtained extremely small stable friction, also, the inner circumference of the fluororesin in contact with the shaft
The wavy part is formed all around the part, reducing sliding contact resistance with the shaft.
Smaller, more stable friction
And the change in sliding resistance can be suppressed to a small width.
When fitting the shaft further,
It can absorb fluctuations. In addition,
With radial grooves formed on the inner periphery of fluororesin
In addition, it is suitable as a bearing for rotation. Also, in the manufacture of the bearing member, so using a fluororesin tube length, diameter can be freely selected, fluororesin Chu
The rubber and rubber are integrally bonded and molded.
There is no fear .

[Brief description of the drawings]

FIG. 1 shows a bearing member manufactured by the manufacturing method of the present invention .

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory view at the time of manufacturing a bearing member.

FIG. 4 is a cross-sectional view before mounting a mold when manufacturing a bearing member .

FIG. 5 is a cross-sectional view at the time of mounting a mold when manufacturing a bearing member .

FIG. 6 is an explanatory view at the time of cutting after removal from a mold.

FIG. 7 is a perspective view of a first embodiment of the bearing member of the present invention.

FIG. 8 is a perspective view of a second embodiment of the bearing member of the present invention.

FIG. 9 is an explanatory view at the time of manufacturing a conventional bearing member.

FIG. 10 is a sectional view of a conventional product before a mold is mounted.

FIG. 11 is a perspective view of a conventional bearing member.

FIG. 12 is a perspective view of another example of a conventional bearing member.

[Explanation of symbols]

 1 Bearing member 2 Fluororesin tube 3 Rubber 4 Core rod

Claims (3)

(57) [Claims] 1. A plurality of wavy portions over the entire surface of a core bar.
Is formed on the core rod on which the wavy portion is formed.
And a fluororesin tube fitted to the core rod
Is coated with rubber and vulcanized with a mold to form the fluorine
While integrating the resin tube and rubber,
Multiple wavy sections around the entire inner surface of the resin tube
A bearing member characterized by being formed. 2. A core rod table in place of a corrugated portion on the surface of the core rod.
A large number of radial grooves are formed on the
2. A radial groove is formed on the peripheral surface.
The bearing member according to any one of the preceding claims . 3. A fluororesin tube having a smooth surface.
Is fitted to the processed core rod and then fitted to the core rod.
The outer circumference of the fluorinated resin tube covered with rubber
The upper and lower dies with a groove formed in the longitudinal direction of the inner circumference
And then vulcanizing and molding.
The above-mentioned fluororesin tube and rubber are integrally bonded and molded
And after vulcanization, cut to a predetermined length in the axial direction.
Manufacturing method of a bearing member.