JP4248807B2 - Resin thrust washer and manufacturing method thereof - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a resin thrust washer mounted on a shaft portion of a rotating body and a manufacturing method thereof, and more particularly to a resin thrust washer and a manufacturing method thereof capable of obtaining a product with high dimensional accuracy at low cost.
[0002]
[Prior art]
The thrust washer is provided as a protective component around the shaft portion of the rotating body in the mechanical device.
[0003]
FIG. 6 shows a case where such a thrust washer is attached to one rotating body 62 between two relatively rotating rotating bodies 61 and 62. The thrust washer 63 is integrally injection-molded as a donut-shaped annular body 64 with resin, and has a lubricant introduction space 65 extending from the inner peripheral side to the radially outer side, and further from the introduction space 65 to the outside of the back surface. It has a tubular projection 66 that comes off. The tubular protrusion 66 is supported concentrically with the rotating body 62 by inserting it into a fitting hole 70 provided around a shaft portion (not shown) of the rotating body 62.
[0004]
When the rotating body 62 rotates, the lubricating oil flows in the radial direction as indicated by the arrow due to centrifugal force, flows into the introduction space 65 of the thrust washer 63, flows out from the introduction space 65 through the tubular protrusion 66, and the surface of the rotating body 62. Lubricate. The lubricating oil also flows into the gap between the annular body 64 and the other rotating body 61 and lubricates between the rotating bodies 61 and 62.
[0005]
However, since the conventional thrust washer 63 is injection molded as an integral structure, the introduction space 65 of the lubricating oil is formed in a state of being recessed radially outward as described above. 65 must be formed by a mold having a slide mechanism such as a punching die. For this reason, the mold structure is complicated, and a molded product molded with a punching die tends to generate burrs, and there is a problem that post-processing work for correcting the burrs increases. Therefore, the production of the thrust washer having the above structure has a problem that it is generally inevitable that the cost is increased, and that the dimensional accuracy of the molded product is also increased.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a resin-made thrust washer that eliminates the above-described conventional problems and enables a high-dimensional accuracy product to be manufactured at low cost, and a method for manufacturing the same.
[0007]
[Means for Solving the Problems]
The resin thrust washer of the present invention that achieves the above object has the following configuration (1).
(1) In a resin thrust washer forming a donut-shaped annular body, an outer peripheral edge shape is formed inside the donut-shaped annular body and extends radially outward from the inner peripheral side as viewed from the central axis direction of the annular body. Forming an annular introduction space for lubricating oil having a shape formed by combining a plurality of arc shapes that bulge outward in the radial direction, and on the inner side in the vicinity of the outer peripheral edge of the arc shape, from the annular introduction space to the back outer side of the washer together intermittently providing the tubular projection having the cause passage flowing the lubricating oil toward the inside in the circumferential direction of the annular, the annular introduced at a plane perpendicular to the donut-shaped annular body to the central axis of the annular body A resin-made thrust washer comprising two halves having a shape that bisects a space, and the two halves are bonded to each other at the outer periphery.
[0008]
Moreover, the manufacturing method of the resin-made thrust washer by this invention has the structure of the following (2).
(2) A method for producing the resin thrust washer described in (1) above, wherein the two halved members described in (1) are individually injection molded with resin, and then the outer periphery of these halved members A method for producing a resin thrust washer, wherein the parts are bonded together.
[0009]
As described above, in the present invention, the donut-shaped annular body constituting the thrust washer main body is constituted by the half member that divides the introduction space extending in the radial direction on the plane orthogonal to the central axis. Since the introduction space does not have a portion recessed in the radial direction, the half member can be molded with a mold without a die or the like having a slide mechanism. Therefore, it is possible to obtain a molded product with less burrs and less post-correction work, and thereby a molded product with high dimensional accuracy can be obtained at low cost.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the drawings.
[0011]
1 to 5 show an example of the thrust washer of the present invention.
[0012]
The thrust washer shown in the figure has a donut-shaped annular body 1 as a main body. The annular body 1 is formed with a lubricating oil introduction space 2 extending radially outward from the inner peripheral side, and further formed with a tubular protrusion 3 that extends from the introduction space 2 to the outside of the back surface. A plurality of tubular protrusions 3 are provided, and are provided at substantially equal angles in the circumferential direction of the annular body 1 around the central axis A. In addition, a large number of concave grooves 4 extending in the radial direction are provided at equal intervals in the circumferential direction on the outer edge portion of the opposite front surface.
[0013]
The annular body 1 having the above-described configuration is composed of two halved members 10 and 11 that divide the introduction space 2 in a plane perpendicular to the central axis A, and the two halved members 10 and 11. Is formed by adhering the peripheral portions to each other. In the half members 10, 11, a part of the introduction space 2 and the concave groove 4 are formed on the half member 10 side, and the remaining part of the introduction space 2 and the tubular protrusion 3 are formed on the half member 11 side. Is formed.
With the above configuration, for example, as described above with reference to FIG. 6, the lubricating oil is introduced into the annular introduction space 2, and then, by the centrifugal force at the time of rotation of the thrust washer rotating with the rotation of the rotating body 62. The flow of the lubricating oil from the inner peripheral side of the donut-shaped annular body (from the introduction space 2 side) toward the outer back side of the washer is generated in the flow path in the tubular protrusion 3, and the tube tip of the protrusion 3 is After that, the lubricating oil flows out and further flows to the required part.
In the annular introduction space 2 of the lubricating oil, the outer peripheral shape thereof is, for example, a broken line in FIG. 2 (a solid line in a partially excerpted cross section) so that the lubricating oil flows effectively by such centrifugal force. As shown in FIG. 2, the outer peripheral line shape of the space 2 is formed to swell outward in the radial direction when viewed from the central axis direction of the annular body 1 , specifically, a shape in which a plurality of arc shapes are combined. Has been. In the example of FIG. 2, the outer peripheral edge shape of the annular introduction space 2 is configured by four arc portions B centered on the central axis A and four arc portions C (12 in space) that swell further outward. ing. The space 12 formed by the four arc portions C swelled further outward than the four arc portions B is as shown in the side sectional views of FIGS. 1 and 5.
Then, inside the vicinity of the outer peripheral edge B~C of the circular arc, the tubular projection 3 is provided to be intermittently arranged in the circumferential direction of the annular introducing space 2. This is because the lubricating oil flows toward the outermost peripheral edge of the introduction space due to the centrifugal force. As described above, in FIG. 2, the shape of the outer peripheral edge is four arcuate portions C bulging in the radial direction and four concentric arcuate portions bulging in the radial direction with the center common to the central axis of the annular body. is formed from B, the tubular projections 3, in each of which a total of eight arcuate portions B-C, the most recent inside a and the flow path of the tubular projections 3 of the outer peripheral edge line B-C is open to the space 2 A total of eight are provided at the positions.
[0014]
In the method for manufacturing the thrust washer, the two half members 10 and 11 are individually injection-molded with a thermoplastic resin, and then the two half members 10 and 11 are overlapped to bond the outer peripheral edges to each other. What should I do? FIG. 5 shows the two halves 10 and 11 individually injection-molded before bonding, and FIG. 1 shows the thrust washer after bonding them.
[0015]
The bonding means for bonding the two halved members 10 and 11 is not particularly limited, but is preferably performed by welding having excellent bonding workability. As the welding means, ultrasonic welding, vibration welding, laser welding, spin welding, or the like can be used. Of course, regardless of the welding means, it is more disadvantageous than welding in terms of workability, but bonding with an adhesive may also be used.
[0016]
As the resin used in the thrust washer of the present invention, a thermoplastic resin used as an injection molding resin can be widely used. Examples thereof include nylon, polyester, polyimide, polyamideimide, acrylonitrile / butadiene / styrene (ABS), polyoxymethylene, polycarbonate, polyethylene, and polypropylene.
[0017]
According to the present invention, as described above, the thrust washer is composed of the two halved members 10, 11, and the inner lubricating oil introduction space 2 is divided into two by a plane orthogonal to the central axis A of the annular body 1. Therefore, it is not necessary to provide a die or the like having a slide mechanism in the direction orthogonal to the central axis A for forming the introduction space 2 as a mold for injection molding the half members 10 and 11. It becomes possible to mold with a typical mold. Therefore, the half members 10 and 11 after the injection molding have few burrs and can be formed into a molded product with little post-correction processing. Further, it is possible to obtain a molded product with low cost and excellent dimensional accuracy.
[0018]
The thrust washer of the present invention is used as a protective component around the shaft portion of a rotating body such as a gear or a wheel in a mechanical device. For example, as shown in FIG. 6, it is used between two rotating bodies that rotate relative to each other or between a rotating body and a stationary body.
[0019]
【The invention's effect】
As described above, according to the present invention, the donut-shaped annular body constituting the thrust washer main body is constituted by the half member that divides the introduction space extending in the radial direction on the plane orthogonal to the central axis. Since the introduction space does not have a portion that is recessed in the radial direction in the half member, the half member can be molded with a mold that does not include a die having a slide mechanism. Therefore, it is possible to obtain a molded product with less burrs and less post-correction work, thereby obtaining a molded product with high dimensional accuracy at low cost.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a thrust washer according to an embodiment of the present invention and corresponding to the direction of arrows XX in FIG.
FIG. 2 is a right side view showing the thrust washer shown in FIG. 1 with a part cut away.
3 is a left side view of the thrust washer shown in FIG. 1. FIG.
4 is a cross-sectional view taken along line YY in FIG. 3;
FIG. 5 is an explanatory view showing a state in which it is separated into two halved members in FIG. 1;
FIG. 6 is an explanatory view showing a main part of a conventional thrust washer in use.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ring body 2 Introduction space 3 Tubular protrusion 4 Concave groove 10, 11 Half member
12 Space A formed by arc portion C bulging outward from arc portion B
B Circular arc centering on central axis A
C Arc part bulging further outward than arc part B

Claims (5)

In a resin thrust washer that forms a donut-shaped annular body, the outer peripheral shape of the resin thrust washer extends radially outward from the inner peripheral side and viewed from the center axis direction of the annular body in the radial direction. An annular introduction space for lubricating oil having a shape formed by combining a plurality of arc shapes that bulge outward is formed, and inside the vicinity of the outer peripheral edge of the arc shape, from the annular introduction space toward the outside of the back surface of the washer provided with a tubular projection having the cause passage flowing the lubricating oil therein intermittently in the circumferential direction of the annular, bisects the annular introduction space at a plane perpendicular to the donut-shaped annular body to the central axis of the annular body A resin thrust washer comprising two halved members having the above-mentioned shape, and the two halved members being bonded to each other at the outer periphery.   The resin thrust washer according to claim 1, wherein the adhesion is welding. The resin thrust washer according to claim 2, wherein the welding is ultrasonic welding, vibration welding, laser welding, or spin welding.   A method for producing a resin thrust washer according to claim 1, wherein the two half members according to claim 1 are individually injection molded with resin, and then the outer peripheral portions of these half members are bonded to each other. A method for producing a resin thrust washer. The manufacturing method of the resin-made thrust washer of Claim 4 which performs the said adhesion | attachment by welding.

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