JPH07103242A - Rolling bearing provided with resin coating - Google Patents

Abstract

PURPOSE:To precisely form a resin coating for thermal insulation without requiring cutting of an outer ring inside diameter face so as to reduce production costs and so as to apply a rolling bearing to a place, which is affected by thermal influence from the outside, such as a flywheel damper, for example. CONSTITUTION:A resin coating 3 is integrally formed on the outside diameter face 2a of the outer ring 2 excepting one end part 2aa in the width direction. A bearing 1 consists of a deep groove ball bearing provided with a seal 7. Polyphenylene sulfide resin or the like is used for the resin coating 3. An area provided with no resin coating 3 in the outer ring 2 is the area in which the outer ring 2 can be positioned relatively to a metal mold in the case of integral molding of the resin coating 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing having a resin coating, which is used in a place which is affected by heat from the outside of the bearing, such as a flywheel damper for automobiles.

[0002]

2. Description of the Related Art Conventionally, as a bearing used in a portion which is thermally affected from the outside, an outer ring 51 having an outer diameter surface integrally formed with a heat insulating resin coating 52 is used as shown in FIG. There is. By providing the resin coating 52 in this way, transfer of external heat to the bearing is mitigated, and deterioration due to overheating of the lubricant in the bearing and excessive thermal strain of each part of the bearing are prevented.

[0003]

Since the resin coating 52 covers the outer diameter surface of the outer ring 51, as shown in FIG.
A guide surface for the dies 53, 53 when the resin coating 52 is integrally molded serves as an inner diameter surface 51a of the outer ring 51 (a portion surrounded by a circle a in the figure). This guide has a resin coating 52
In order to prevent uneven thickness, it is necessary to carry out with high accuracy, and it is required to finish the inner diameter surface 51a with high accuracy. Therefore, it is necessary to finish the inner diameter surface 51a by grinding, which causes a cost increase. That is, in the case of a deep groove ball bearing, the raceway surface 51b of the outer ring 51 is generally ground, but the inner diameter surface 51a does not need to be ground. In the bearing of FIG. 4, the inner diameter surface 51a is ground only for positioning during integral molding. Will be done. Therefore, the grinding of the inner diameter surface 51a causes a cost increase.

An object of the present invention is to provide a resin-coated rolling bearing in which the resin coating can be accurately formed without the need to grind the inner diameter surface of the outer ring and the manufacturing cost can be reduced.

[0005]

The rolling bearing with resin coating according to the present invention is formed by integrally molding the resin coating on the outer diameter surface of the outer ring, leaving one end in the width direction.

[0006]

With this structure, by utilizing the portion of the outer ring outer diameter surface where the resin coating is not provided as a guide for the die,
Grinding of the inner surface of the outer ring becomes unnecessary. Therefore, the cost reduction effect can be obtained. The outer diameter surface of the outer ring is generally ground for fitting to the housing and is finished with high accuracy. Therefore, by using this outer diameter surface as a guide for the mold, the resin coating can be made highly precise without uneven thickness.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The resin-coated rolling bearing 1 is a deep groove ball bearing with a seal, in which the resin coating 3 is integrally formed on the outer diameter surface 2a of the outer ring 2 while leaving one end portion 2aa in the width direction. Between the outer ring 2 and the inner ring 4, a rolling element 6 held by a cage 5 is interposed, and a pair of seals 7, 7 contacting the seal groove 8 of the inner ring 4 are provided on the inner circumferential surface of the outer ring 2. It is attached to.

Polyphenylene sulfide resin (hereinafter referred to as "PPS resin") is used as the resin for the resin coating 3.
As will be described later, it is integrally formed with the outer ring 2 by injection molding. The resin coating 3 is provided in a range covering the outer diameter surface 2a of the outer ring 2 and the width surface of the other end, and the outer diameter surface 2a of the outer ring 2 is covered with the resin coating 3
A circumferential groove 8 having a rectangular cross section is provided in order to increase the restraining force of. The resin coating 2 is molded so as to fill the inside of the circumferential groove 8.

FIG. 2 shows a cross section of the molding die. Resin coating 3
Is integrally formed with the outer ring 2 using a pair of molds 10 and 11. At this time, the outer ring 2 is positioned in the mold 10 by using the one end portion 2aa (the portion surrounded by the circle b) of the outer diameter surface 2a where the resin coating 3 is not provided as a guide.

According to this resin-coated rolling bearing 1,
In this way, the portion 2aa of the outer ring outer diameter surface 2a where the resin coating 3 is not provided can be positioned as a guide for the mold 10. Therefore, it is not necessary to grind the inner diameter surface 2b of the outer ring, and the cost reduction effect can be obtained. Outer ring outer diameter surface 2a
Is generally ground for fitting with a housing and finished with high precision. Therefore, by using the one end portion 2aa of the outer diameter surface 2a as a guide of the mold 10, the resin coating 3 can be molded with high precision without uneven thickness. The resin coating 3 prevents heat from being transferred to the bearing 1 from the outside, but since the portion of the outer ring outer diameter surface 2a where the resin coating 3 is not provided is in a small range, reduction of the heat insulating effect is practical. It can be suppressed to a level that does not cause a problem above.

FIG. 3 shows an example in which the resin-coated rolling bearing 1 is used as a buffer mechanism in a torque transmission mechanism of an internal combustion engine. This transmission mechanism uses a flywheel 22
This is a type in which the divided flywheels 23 and 24 are divided, and a damper 25 that allows relative rotation within a certain limit is interposed between the wheels 23 and 24 to buffer against torque fluctuations. The resin-coated rolling bearing 1 is provided between the split flywheels 23 and 24. One split flywheel 23 is used for the crankshaft 2 of the engine.
It is bolted to 6. The clutch cover 32 of the friction clutch 27 is fixed to the other split flywheel 24. A clutch disc 29 is provided between the pressure plate 28 of the friction clutch 27 and the flywheel 24, and the clutch disc 29 is attached to an input shaft 30 of a power transmission device (not shown). The pressure plate 28 is biased to the flywheel 24 by a plate spring 33 rotatably supported by the clutch cover 32.

The inner ring 4 of the resin-coated rolling bearing 1 is fitted into the boss portion 23a of the split flywheel 23, and is fixed in the width direction by the step surface and the plate member 34. The outer ring 2 is press-fitted onto the inner diameter surface of the split flywheel 24, and the plate member 3
It is prevented from coming off at 5.

In this transmission mechanism, a large amount of heat is generated on the friction surface 24a of the split flywheel 24 that is in sliding contact with the clutch disc 29. The heat transfer to the bearing 1 is prevented by the resin coating 3.

[0014]

The rolling bearing with resin coating of the present invention is
Since the resin coating is integrally molded on the outer diameter surface of the outer ring, leaving one end in the width direction, the resin coating can be accurately molded without the need to grind the inner diameter surface of the outer ring, reducing manufacturing costs. Can be achieved.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a mold for integrally molding a resin coating on the outer ring.

FIG. 3 is a schematic cross-sectional view of a torque transmission mechanism using the resin-coated rolling bearing.

FIG. 4 is a sectional view of a conventional example.

FIG. 5 is a sectional view of a mold for integrally molding a resin coating on the outer ring.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Roller bearing with resin coating, 2 ... Outer ring, 2a ... Outer diameter surface, 2aa ... One end part, 3 ... Resin coating, 4 ... Inner ring, 6 ... Rolling element, 10, 11 ... Mold

Claims (1)

[Claims] 1. A rolling bearing with a resin coating, wherein a resin coating is integrally formed on the outer diameter surface of an outer ring, leaving one end in the width direction.