KR20030069438A - Angular ball bearing - Google Patents

Abstract

PURPOSE: An angular ball bearing is provided to prevent a sliding section of the angular ball bearing from being worn and to allow a cage to smoothly deal with an angular variation of the bearing. CONSTITUTION: An angular ball bearing includes a pair of inner wheels, a pair of outer wheels coupled to the inner wheels through balls aligned at an external portion of the inner wheels, a pair of cases(50) installed between the inner and outer wheels so as to maintain an interval between balls. A pair of seals is installed at openings formed in left and right sides of the inner and outer wheels so as to prevent grease oil from being leaked. A plurality of ball receiving sections(51) is formed in the cases(50). A grease filling section(52) is formed between the ball receiving sections(51).

Description

Angular Ball Bearings {ANGULAR BALL BEARING}

The present invention relates to angular ball bearings, and more particularly to angular ball bearings to prevent wear of parts, to reduce operating noise and to prolong life.

Angular ball bearings can support radial loads, thrust loads and composite loads, and have high load capacity, so they are widely used for high precision and high speed rotation. The bearings for wheel bearing units of automobiles are double row angular ball bearings, and these bearings are configured to separate the inner ring and the ball in consideration of the design features and the economics of manufacturing.

As shown in FIG. 1, the conventional angular ball bearing 10 mediates the inner rings 20 and 20 and the balls 30 and 30 arranged in a row or in a double row on the outside of the inner rings 20 and 20. Cages 50 and 50 which are installed between the outer ring 40 and the inner ring 20, 20 and the outer ring 40 that are coupled to each other and maintain the balls 30 and 30 at predetermined intervals. And an annular lip seal 60, 60 provided at both end portions of the opening to prevent water penetration and grease leakage.

As shown in FIG. 3, one side of the cage 50 is formed with a plurality of ball receiving portions 51 at regular intervals so as to open the upper side when referring to the drawing, and the bottom surface is formed in a plane.

As shown in FIG. 1, the lip seals 60 and 60 are installed at both open ends between the inner ring 20 and the outer ring 40 to prevent leakage of grease filled therein and to prevent moisture from leaking inside. It is to prevent inflow. As shown in FIG. 4, the inner diameter side end portion of the lip seal 60 is installed at a lip seal installation portion 21 formed at a height lower than the outer circumferential surface of the inner ring 20 at the outer diameter side end portion of the inner ring 20. The first lip 61 to be in close contact with the inner surface of the lip seal installation portion 21 to prevent grease leakage, and the water formed on the outer side of the first lip 61 and disposed close to the bottom surface of the lip seal installation portion 21. And a second lip 62 for penetration blocking.

As shown in FIG. 2, the angular ball bearing 1 having such a structure is installed and used between the compressor nose part N and the pulley P through which the compressor rotating shaft S of the automobile air conditioning apparatus passes. The inner circumferential surface of the inner ring 20, 20 is in contact with the outer circumferential surface of the nose portion N. Therefore, the pulley P can rotate by the angular ball bearing 1.

However, the angular ball bearing according to the prior art has the following problems.

The cages 50 and 50 contain about 25% of NYLON66 + GLASS FIBER and have considerable strength and brittleness. If the contact angle of the balls 30, 30 and the cage 50, 50 has to be changed by the internal clearance of the bearing 10 and the offset in the load direction, the balls 30, 30 may naturally change, but the cage As the 50 and 50 do not correspond thereto by their own strength, one side of the cage 50 and 50 contacts the balls 30 and 30 with an overload. Thus, abrasion by contact occurs, grease is contaminated by the abrasion, and the bearing 10 is early flaked.

In addition, an overload may be transmitted to the inner ring 20 through a belt (not shown) wound around the pulley P in the installed state of the angular ball bearing 1, and the load may be transmitted to the inner ring 20 and the nose portion N. Since the inner ring 20 and the nose portion N are slid to each other by being concentrated at a portion between them, the temperature of the bearing 10 may rise and be damaged, and the temperature of the bearing 10 may increase. There is also a problem that the life is shortened.

In addition, when the pressure rises due to the temperature increase inside the bearing 10, the difference between the internal pressure and the external pressure increases, and the first and second lips 61 and 62 are pushed outward by the pressure difference. As a result, each of the ribs 61 and 62 is separated from the inner ring, and there is a gap therebetween so that grease leaks to the outside.

An object of the present invention is to provide an angular ball bearing that prevents abrasion of the sliding part and enables the cage to flexibly cope with the angle change of the bearing.

Another object of the present invention is to prevent slippage from occurring between the inner ring and the compressor nose portion to which the inner ring is fixed.

In addition, another object of the present invention is to prevent the grease filled therein from leaking even if the internal pressure increases due to the temperature increase in the bearing.

1 is a cross-sectional view of a typical angular ball bearing.

2 is a perspective view of a cage applied to the angular ball bearing according to the prior art.

3 is a plan view of the inner ring applied to the angular ball bearing according to the prior art.

4 is a cross-sectional view of a lip seal applied to an angular ball bearing according to the prior art.

5 is a perspective view of a cage applied to the angular ball bearing according to the present invention.

6A and 6B are respectively a front view and a plan view of an inner ring applied to the angular ball bearing according to the present invention.

Figure 7 is a cross-sectional view showing one embodiment of a lip seal applied to the angular ball bearing according to the present invention.

8 is a cross-sectional view showing another embodiment of a lip seal applied to the angular ball bearing according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: bearing, 20: inner ring

22: slit, 30: ball

40: outer ring, 50: cage

52: grease live part, 60: lip seal

In the angular ball bearing according to the present invention for achieving the above object, a plurality of balls are arranged in a circumferential direction through a cage between an outer ring and an inner ring, and lip seals are formed at both opening ends between the outer ring and the inner ring. In each of the angular ball bearings are provided, the ball receiving portion on which the ball is seated is formed at a predetermined interval on one side of the cage, and the grease filling portion is formed so as to open toward the other side between the ball receiving portions on the other side It is done.

The inner circumferential surface of the inner ring is characterized in that a plurality of slits opened inward.

Both inner end portions of the inner circumferential surface of the inner ring are formed with a protrusion having a lower height than the outer circumferential surface of the inner ring, and an inner first recessed portion and an outer second recessed portion are formed, and the lip seal has an end portion in close contact with an inner surface of the first recessed portion. 1 granule; It is preferably made of a second lip contacting the outer surface of the protrusion to form a first space sealed to the outside.

The second lip may be formed of first and second subassemblies forming a second space in contact with an outer surface of the protrusion and a bottom surface of the second recess.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

5 is a perspective view of a cage applied to the angular ball bearing according to the present invention, Figures 6a and 6b are respectively a front view and a plan view of the inner ring applied to the angular ball bearing according to the present invention, Figure 7 is an angular ball bearing according to the present invention 8 is a cross-sectional view showing an embodiment of a lip seal applied to, Figure 8 is a cross-sectional view showing another embodiment of the lip seal applied to the angular ball bearing according to the present invention. The same reference numerals are given to the same components as those used in FIGS. 1 to 4.

The overall configuration of the angular ball bearing according to the present invention is as shown in Figure 1, as in the conventional, the inner ring 20, 20, and the ball 30 arranged in a row or more outside the inner ring (20, 20) ( Cages 50 and 50 installed between the outer ring 40 and the inner ring 20, the outer ring 40, and the outer ring 40 coupled to each other through the medium 30 to maintain the balls 30 and 30 at predetermined intervals. And, the inner ring 20, 20 and the outer ring 40, the left and right openings on both sides of the lip chamber 60, 60 to prevent the infiltration of moisture and leakage of grease is provided, respectively.

As shown in FIG. 5, in the cage 50, a plurality of ball receiving portions 51 having an upper side opening are formed at regular intervals, and the other side is formed in a plane while the other side has a flat surface. The grease filling part 52 with the lower side opened is formed between the two parts. Grease is filled in the grease filling part 52 to increase the cooling effect of the bearing, and as the weight of the cage 50 decreases, movement is possible even with a small force.

As shown in FIG. 6A, the inner circumferential surface of the inner ring 20 has a plurality of slits 22 having one side open along the width direction of the inner ring 20 and toward the compressor nose portion N as shown in FIG. 6B. It is formed at regular intervals.

As shown in FIG. 7, the first lip 63 and the second lip 64 are formed on the inner diameter side of the lip seal 60 to prevent grease leakage and water inflow.

Lip seal mounting portions 23 are formed at both ends of the outer circumferential surface of the inner ring 20. The lip seal installation part 23 consists of the protrusion part 23a whose height is lower than the outer peripheral surface of the inner ring | wheel 20, and the two recessed parts 23b and 23c formed in both inside and outside sides by this protrusion part 23a.

The first lip 63 of the lip seal 60 is disposed on the first recess 23b of the lip seal installation portion 23 and the end thereof is in close contact with the inner surface of the first recess 23b, and the second lip 64 ) Is further divided into two first and second auxiliary ribs 64a and 64b so that the ribs 64a and 64b are respectively disposed on the second recess 23c and the outer surface of the protrusion 23a and the second yaw. The first and second subassembly 64a of the second lip 64 and between the first subassembly 64a of the first lip 63 and the second lip 64 are brought into close contact with the bottom surface of the mouth 23c, respectively. The sealed spaces S1 and S2 are respectively formed between the 64b.

The action of the angular ball bearing according to the present invention configured as described above is as follows.

In order to prevent wear of the sliding part of the bearing 10, grease filled in the bearing is filled between the ball 30 and the cage 50 and in the grease filling part 52 of the cage 50.

In the state where the bearing 10 is installed in, for example, the compressor nose portion N, the load applied to the bearing 10 by the pulley P is distributed through the slits 22 so that the load is concentrated on a part of the inner ring 20. All the parts of the inner ring 20 are in close contact with the compressor nose portion N instead.

As described above, the outside air flows through the slits 22 of the inner ring 20 while the bearing 10 is installed, and the inner ring 20 is cooled by the outside air.

As the cage 50 moves in accordance with the movement of the ball 30 during operation of the device, the friction force between the ball 30 and the cage 50 is maintained.

On the other hand, when the internal pressure of the bearing 10 is increased by the operation of the device, the grease filled therein due to the pressure difference pushes the first lip 63 and flows into the first space S1. And since the 2nd lips 63 and 64 face the direction which prevents the leakage of grease, the 1st 2nd lips 63 and 64 have little rolling, and there is little grease leakage. The grease leaked into the first space S1 after pushing the first lip 63 has almost no pressure difference between the inside of the first space S1 and the outside air, and the first space S1 is formed in the first auxiliary assembly 64a. Since it is blocked from the second space (S2) by the second space (S2) does not leak.

8 is a cross-sectional view showing a second embodiment of a lip seal applied to an angular ball bearing according to the present invention.

As shown in the figure, a lip seal installation portion 24 made up of two concave portions 24b and 24c partitioned by protrusions 24a is formed at both ends of the outer circumferential surface of each inner ring 20, respectively. The lip chamber 60 is disposed at both openings of the inner ring 20 and the outer ring (not shown), and an inner diameter side end thereof is installed in the lip seal installation unit 24.

The lip seal 60 is composed of a first lip 65 and a second lip 66. The first lip 65 is formed in the horizontal direction and is disposed in the first recessed portion 24b inside the protrusion 24a, and the end thereof is in close contact with the inner surface of the first recessed portion 24b. The silver is in close contact with the outer surface of the protrusion 24a in the same direction as the first lip 65, the closed space (S3) is formed in the interior of the lip chamber (60).

According to the lip seal 60 of the present example, when the internal pressure of the bearing 10 rises, grease filled therein due to the pressure difference tries to push the first lip 65 and flows into the space S3. Since the lip 65 faces the direction of preventing the leakage of grease, the amount of the leakage of the grease is small since the first lip 65 is less pushed. The grease leaked to the space S3 by pushing the first lip 65 does not leak to the outside because there is little pressure difference between the inside of the space S3 and the outside air.

Therefore, grease is filled in the grease filling part 52 of the cage 50, so that a larger amount of grease can be filled than in the prior art, and since there is little leakage of the filled grease, the lubrication and cooling effect can be enhanced.

In addition, since the grease filling part 52 of the cage 50 is made to lose weight, the weight of the cage 50 is reduced, so that movement is possible even with a small force, and the ball 30 is offset by the tolerance in the bearing 10 and the offset in the load direction. Even if the angle of contact with the c) changes, the cage 50 moves flexibly by the force applied from the ball 30, so that the frictional resistance with the ball 30 is reduced.

In addition, the inner ring 20 is firmly fixed to the compressor nose portion N or the rotating shaft by the slit 22 of the inner ring 20, and the inner ring 20 is cooled by the outside air flowing through the slit 22. .

As described above, in the angular ball bearing according to the present invention, the filling amount of the grease increases, so that the lubrication is better, the operation noise is reduced, the cooling effect of the bearing is large, the change in the physical properties of the grease is relatively delayed, and the life of the bearing This is extended.

In addition, even if a small force is transferred from the ball, the cage moves along the ball flexibly, thereby reducing the frictional resistance between the ball and the cage, thereby reducing uneven wear of the cage.

In addition, as the inner ring is firmly fixed to the compressor nose part or the rotating shaft to prevent slip between them, the temperature rise of the bearing is prevented due to the slip, and the outside air flows through the slit to improve the cooling performance of the bearing, thereby improving the bearing life. Can be extended.

In addition, since the grease filled in the bearing does not leak to the outside, it is possible to maintain a high cleanliness of the inside of the bearing and to have a long service life.

Claims (4)

Inner ring; Outer ring; A ball arranged in at least one row between the inner ring and the outer ring; A cage supporting the ball; And, in the angular ball bearing comprising a lip seal provided on both open ends between the inner ring and the outer ring, Angular ball bearing, characterized in that the one side of the cage is formed with the ball receiving portion is seated at a predetermined interval, the grease filling portion is formed to be opened toward the other side between the ball receiving portion of the other side. The angular ball bearing according to claim 1, wherein a plurality of slits opened inward are formed on an inner circumferential surface of the inner ring. The inner periphery of the first recess and the second recess of the outer periphery are formed by protrusions having a height lower than that of the outer periphery of the inner ring. A first lip in close contact with the inner surface of the portion; An angular ball bearing, characterized in that it comprises a second lip contacting the outer surface of the protrusion to form a first space sealed to the outside. 4. The angular ball bearing according to claim 3, wherein the second lip comprises first and second subassemblies which contact the outer surface of the protrusion and the bottom surface of the second recess to form a second space.