Three-point contact type bearing

Abstract

The utility model discloses a three-point contact type bearing, which relates to the bearing field, and comprises an outer ring and an inner ring, the inner ring is arranged on the inner side of the outer ring, a plurality of balls are arranged between the outer ring and the inner ring, the inner ring comprises a front inner ring on the front side and a rear inner ring on the rear side, the front side of the rear inner ring is provided with a mounting groove, the mounting groove is internally provided with a connecting ring, and the connecting ring is connected with the outer ring. The inner side of the connecting ring is connected with the inner wall of the mounting groove through threads, and the front end of the rear inner ring and the rear end of the front inner ring are both slopes. The inner ring is divided into the rear inner ring and the front inner ring, the distance between the rear inner ring and the front inner ring can be adjusted, and when the balls are loosened due to abrasion, supporting points of the rear inner ring and the front inner ring on the balls are adjusted by reducing the distance between the rear inner ring and the front inner ring, so that the balls are pushed; therefore, gaps caused by abrasion are made up, and looseness caused by abrasion is avoided.

Description

Technical Field

[0001] The utility model relates to the field of bearings, in particular to a three-point contact bearing. Background Art

[0002] A bearing is a device used to support a mechanical rotating body. It can greatly reduce the friction during rotation, allowing the rotating body of the mechanical equipment to run more smoothly. There are various types of bearings, including three-point contact bearings.

[0003] The three-point contact bearing is a basic component commonly used in the main shaft support of aircraft engines. When subjected to pure radial load, each loaded ball has two points of contact with one groove and one point of contact with another groove, such as a three-point contact bearing with announcement number CN218266793U in the prior art.

[0004] The main components of a three-point contact bearing include an inner ring, an outer ring, and balls. After long-term use, the balls and other components will inevitably wear out. The balls are originally supported between the inner and outer rings of the bearing. When the balls are worn, the supporting strength of the balls decreases, which will cause the bearing to loosen, thereby affecting the normal use of the bearing. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a three-point contact bearing, which adjusts the support points of the rear inner ring and the front inner ring on the ball by reducing the distance between the rear inner ring and the front inner ring, so that the ball is pushed to make up for the gap caused by wear, thereby avoiding looseness caused by wear, and can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the utility model is: a three-point contact bearing, comprising an outer ring and an inner ring, wherein the inner ring is arranged inside the outer ring, a plurality of balls are arranged between the outer ring and the inner ring, and the inner ring comprises a front inner ring on the front side and a rear inner ring on the rear side;

[0007] The front side of the rear inner ring is provided with a mounting groove, the interior of the mounting groove is provided with a connecting ring, the inner side of the connecting ring is connected to the inner wall of the mounting groove by threads, the front end of the connecting ring extends to the front side of the rear inner ring and is fixedly connected to the front inner ring, and the rear inner ring and the front inner ring can be disassembled and separated;

[0008] The rear inner ring and the front inner ring are symmetrically arranged front to back, the front end of the rear inner ring and the rear end of the front inner ring are both slopes, an inner annular groove with adjustable width is provided between the two slopes, the outer end of the ball contacts the upper edges of the front and rear sides of the inner annular groove, the ball can roll along the inner annular groove during operation, and the spacing between the rear inner ring and the front inner ring is proportional to the width of the inner annular groove.

[0009] Furthermore, an outer annular groove is provided on the inner side of the outer ring, and the cross section of the outer annular groove is arc-shaped. The end of the ball away from the inner ring contacts the inner wall of the outer annular groove, and the ball rolls inside the outer annular groove during operation.

[0010] Furthermore, two retaining frames are provided between the outer ring and the inner ring, and the two retaining frames are symmetrically distributed on the front and rear sides of the ball, and the ball is clamped and fixed therein to limit the position of the ball;

[0011] The retaining frame is provided with a plurality of arc grooves on one side facing the balls, the arc grooves correspond to the balls one by one, and the outer ends of the balls are embedded in the corresponding arc grooves to limit the positions of the balls.

[0012] Furthermore, a fixing component is provided between two adjacent balls, and the fixing component includes a through bar, the through bar is located between the two retaining frames, and the two ends of the through bar respectively penetrate the two retaining frames, and the two retaining frames are connected by the through bar so that the two retaining frames are connected as a whole.

[0013] Furthermore, a nut is provided at the outer end of the penetration bar through a thread, and the penetration bar is fixed to the retaining frame through the nut. The tightness of the nut determines the connection strength of the two retaining frames, and the nut is located at the rear side of the rear retaining frame.

[0014] Furthermore, an end plate is fixedly provided at the front end of the penetration strip, a fastening spring is provided between the end plate and the front retaining frame, the front end of the fastening spring is fixedly connected to the end plate, the rear end of the fastening spring is in contact with the front retaining frame, the fastening spring is in a compressed state, and the retaining frame is fixed by its elastic force.

[0015] Compared with the prior art, the utility model provides a three-point contact bearing, which has the following beneficial effects:

[0016] 1. By dividing the inner ring into two parts, the rear inner ring and the front inner ring, and being able to adjust the distance between the two, when the ball becomes loose due to wear, the support points of the rear inner ring and the front inner ring on the ball are adjusted by reducing the distance between the rear inner ring and the front inner ring, so that the ball is pushed, and the gap caused by wear is compensated in this way, thus avoiding looseness caused by wear.

[0017] 2. Connect the two cages and fix the balls through the fixing assembly, and use the elastic force of the tightening spring to control the cage to clamp the balls. Whether the balls become smaller due to wear or become larger due to thermal expansion, it can ensure that the inner wall of the arc groove on the cage is in contact with the outer end of the balls. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the overall structure diagram of the utility model;

[0019] Figure 2 It is a side sectional view of the utility model;

[0020] Figure 3 This is a structural diagram of the cage of the utility model;

[0021] Figure 4 This is a structural diagram of the fixed component of the utility model;

[0022] Figure 5 This is the internal structure diagram of the outer ring of the utility model;

[0023] Figure 6 This is the internal structure diagram of the inner ring of the utility model;

[0024] Figure 7 For the utility model Figure 6 Enlarged view of part A in the middle.

[0025] In the figure: 1. Outer ring; 2. Inner ring; 201. Rear inner ring; 202. Front inner ring; 203. Mounting groove; 204. Connecting ring; 3. Fixing assembly; 301. Through bar; 302. End plate; 303. Fastening spring; 304. Nut; 4. Cage; 5. Ball; 6. Outer annular groove; 7. Inner annular groove. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention will be further described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1-7 As shown, the utility model provides a three-point contact bearing, comprising an outer ring 1 and an inner ring 2, wherein the inner ring 2 is arranged inside the outer ring 1, a plurality of balls 5 are arranged between the outer ring 1 and the inner ring 2, and the inner ring 2 comprises a front inner ring 202 at the front side and a rear inner ring 201 at the rear side;

[0028] The front side of the rear inner ring 201 is provided with a mounting groove 203, and the mounting groove 203 is provided with a connecting ring 204. The inner side of the connecting ring 204 is connected to the inner wall of the mounting groove 203 by threads. The front end of the connecting ring 204 extends to the front side of the rear inner ring 201 and is fixedly connected to the front inner ring 202. The rear inner ring 201 and the front inner ring 202 can be disassembled and separated.

[0029] The rear inner ring 201 and the front inner ring 202 are symmetrically arranged front to back, and the front end of the rear inner ring 201 and the rear end of the front inner ring 202 are both slopes, and an inner annular groove 7 with adjustable width is provided between the two slopes. The outer end of the ball 5 contacts the upper edges of the front and rear sides of the inner annular groove 7, and the ball 5 can roll along the inner annular groove 7 during operation. The spacing between the rear inner ring 201 and the front inner ring 202 is proportional to the width of the inner annular groove 7.

[0030] The ball 5 is arranged between the outer ring 1 and the inner ring 2, and the ball 5 can roll along the inner side of the outer ring 1 and the outer side of the inner ring 2, so as to realize the basic function of the bearing. The ball 5 is also supported between the outer ring 1 and the inner ring 2 during operation. During operation, the ball 5 will be subjected to axial or radial force. Long-term operation and force will cause wear of the ball 5 itself and the outer ring 1 and inner ring 2 in contact with the ball 5.

[0031] The inner ring 2 is divided into two parts, a rear inner ring 201 and a front inner ring 202, which are connected by a mounting groove 203 and a connecting ring 204. The slope and gap between the rear inner ring 201 and the front inner ring 202 form an inner annular groove 7. When the ball 5 becomes loose due to wear, the rear inner ring 201 and the front inner ring 202 can rotate relative to each other. Therefore, the connecting ring 204 penetrates into the mounting groove 203 under the action of the thread. The distance between the rear inner ring 201 and the front inner ring 202 is reduced, and the two slopes are close to each other. The support points of the rear inner ring 201 and the front inner ring 202 on the ball 5 are adjusted, so that the ball 5 is pushed and the ball 5 is pushed to be in close contact with the outer ring 1. In this way, the gap caused by wear is compensated, and looseness caused by wear is avoided.

[0032] During operation, the running track of the ball 5 needs to be restricted, such as Figure 2 , 3 As shown in , 5 and 6, an outer annular groove 6 is opened on the inner side of the outer ring 1, and the cross section of the outer annular groove 6 is arc-shaped. The end of the ball 5 away from the inner ring 2 is in contact with the inner wall of the outer annular groove 6, and the ball 5 rolls inside the outer annular groove 6 during operation.

[0033] Two retainers 4 are provided between the outer ring 1 and the inner ring 2. The two retainers 4 are symmetrically distributed on the front and rear sides of the ball 5 to clamp and fix the ball 5 therein and limit the position of the ball 5.

[0034] The retaining frame 4 is provided with a plurality of arc grooves on one side facing the balls 5 , and the arc grooves correspond to the balls 5 one by one. The outer ends of the balls 5 are embedded in the corresponding arc grooves to limit the positions of the balls 5 .

[0035] A fixing assembly 3 is provided between two adjacent balls 5, and the fixing assembly 3 includes a through bar 301, which is located between two retaining frames 4. Both ends of the through bar 301 respectively penetrate the two retaining frames 4, and the two retaining frames 4 are connected by the through bar 301 so that the two retaining frames 4 are connected as a whole.

[0036] An outer annular groove 6 is provided on the inner side of the retaining frame 4. During the operation of the ball 5, the ball 5 rolls along the outer annular groove 6 on the inner side of the retaining frame 4 and rolls along the inner annular groove 7 on the outer side of the inner ring 2, thereby limiting the operation trajectory of the ball 5. Meanwhile, retaining frames 4 are provided on both the front and rear sides of the ball 5, and the two retaining frames 4 are connected and fixed by a fixing assembly 3, so that the ball 5 is clamped between the two retaining frames 4, and the ball 5 is stuck in the arc groove on the retaining frame 4, and the retaining frame 4 is used to keep the balls 5 evenly distributed.

[0037] In order to avoid the gap between the ball 5 and the cage 4 and prevent it from loosening, Figure 1 , 3 As shown in FIG. 4 , a nut 304 is provided at the outer end of the penetration strip 301 through a thread, and the penetration strip 301 is fixed to the retaining frame 4 through the nut 304. The tightness of the nut 304 determines the connection strength of the two retaining frames 4. The nut 304 is located at the rear side of the retaining frame 4 on the rear side.

[0038] An end plate 302 is fixedly provided at the front end of the penetration strip 301, and a fastening spring 303 is provided between the end plate 302 and the front retaining frame 4. The front end of the fastening spring 303 is fixedly connected to the end plate 302, and the rear end of the fastening spring 303 is in contact with the front retaining frame 4. The fastening spring 303 is in a compressed state, and its elastic force is used to fix the retaining frame 4.

[0039] While the two retainers 4 are connected in series through the through-bar 301, the nut 304 is installed on the through-bar 301 through a thread, and a bolt contact is formed between the nut 304 and the through-bar 301. The connection is that the retainer 4 clamps the ball 5 therein and keeps the outer end of the ball 5 in contact with the inner wall of the arc groove. In the fixed state, the fastening spring 303 is in a slightly compressed state, and its elastic force pushes the retainer 4. Even if the retainer 4 or the ball 5 is worn, the ball 5 can be clamped therein without loosening. After the ball 5 is heated and expanded due to long-term operation, the fastening spring 303 can also appropriately increase the distance between the two retainers 4 and buffer the expansion of the ball 5. The elastic force of the fastening spring 303 does not need to be too large, and it can ensure that the inner wall of the arc groove on the retainer 4 is in contact with the outer end of the ball 5. The arc groove does not need to exert excessive force on the ball 5 to avoid obstructing the rolling of the ball 5.

[0040] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A three-point contact bearing, comprising an outer ring (1) and an inner ring (2), wherein the inner ring (2) is arranged inside the outer ring (1), and a plurality of balls (5) are arranged between the outer ring (1) and the inner ring (2), characterized in that: The inner ring (2) comprises a front inner ring (202) on the front side and a rear inner ring (201) on the rear side; The front side of the rear inner ring (201) is provided with a mounting groove (203), the interior of the mounting groove (203) is provided with a connecting ring (204), the inner side of the connecting ring (204) is connected to the inner wall of the mounting groove (203) by means of threads, and the front end of the connecting ring (204) extends to the front side of the rear inner ring (201) and is fixedly connected to the front inner ring (202); The rear inner ring (201) and the front inner ring (202) are symmetrically arranged front and rear, the front end of the rear inner ring (201) and the rear end of the front inner ring (202) are both slopes, an inner annular groove (7) with adjustable width is provided between the two slopes, and the outer end of the ball (5) contacts the upper edges of the front and rear sides of the inner annular groove (7).

2. A three-point contact bearing according to claim 1, characterized in that: An outer annular groove (6) is provided on the inner side of the outer ring (1), the cross section of the outer annular groove (6) is arc-shaped, and the end of the ball (5) away from the inner ring (2) contacts the inner wall of the outer annular groove (6).

3. A three-point contact bearing according to claim 1, characterized in that: Two retaining frames (4) are provided between the outer ring (1) and the inner ring (2), and the two retaining frames (4) are symmetrically distributed on both sides of the front and rear of the ball (5); A plurality of arcuate grooves are formed on one side of the retaining frame (4) facing the balls (5), the arcuate grooves correspond to the balls (5) one by one, and the outer ends of the balls (5) are embedded in the corresponding arcuate grooves.

4. A three-point contact bearing according to claim 3, characterized in that: A fixing assembly (3) is provided between two adjacent balls (5), the fixing assembly (3) comprising a penetration bar (301), the penetration bar (301) being located between two retaining frames (4), and the two ends of the penetration bar (301) respectively penetrating the two retaining frames (4).

5. A three-point contact bearing according to claim 4, characterized in that: The outer end of the penetration strip (301) is provided with a nut (304) through a thread, and the nut (304) is located at the rear side of the rear retaining frame (4).

6. A three-point contact bearing according to claim 5, characterized in that: An end plate (302) is fixedly provided at the front end of the penetration strip (301), a fastening spring (303) is provided between the end plate (302) and the front retaining frame (4), the front end of the fastening spring (303) is fixedly connected to the end plate (302), and the rear end of the fastening spring (303) is in contact with the front retaining frame (4).

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