Radial limiting structure of a thrust bearing

Abstract

The application relates to the technical field of bearing limiting, and a radial limiting structure of a thrust bearing which comprises a fixed shell, a bearing body and a shaft sleeve. The fixed shell is provided with a containing cavity, the shaft sleeve is embedded in the containing cavity, and the bearing body is embedded in the containing cavity. The bearing body comprises a first connecting ring, a roller and a second connecting ring. The outer wall of the first connecting ring is in close contact with the cavity wall of the containing cavity, the inner wall of the first connecting ring is in close contact with the outer wall of the shaft sleeve, the inner wall of the second connecting ring is in close contact with the outer wall of the shaft sleeve, and the roller is connected between the first connecting ring and the second connecting ring. The bearing is in close contact with the inner walls of the first connecting ring and the second connecting ring, radial cooperation between a dynamic ring and a static ring of the bearing is realized, the problem of lacking radial constraint of a traditional thrust bearing is solved, the stability of a shafting is improved, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of bearing positioning, and in particular to a radial positioning structure for a thrust bearing. Background Technology

[0002] A rivet gun, also known as a rivet gun, is a tool used in the manufacturing industry for fastening and riveting metal sheets, pipes, etc. It is widely used in the riveting of products in various industries.

[0003] Typically, an electric rivet gun consists of a housing containing a gripping unit and a power unit. During operation, the gripping unit grips the shank of the pop rivet, and the power unit moves the gripping unit to break the shank, thus completing the riveting. The gripping unit includes a thrust bearing, which in traditional designs primarily bears axial loads, while the rotor system often experiences radial vibration or eccentric loads. Early thrust bearings lacked radial restraint, leading to insufficient shaft stability and the following problems: Axial-radial coupling failure: Under axial thrust, radial displacement may exacerbate uneven wear between the thrust disc and the bearing plate, reducing lifespan; Degraded dynamic performance: During high-speed rotation, radial wobble can disrupt oil film uniformity, increasing frictional losses.

[0004] To address these issues, radial limiting structures have emerged. In the traditional configuration, the dynamic and stationary rings of the thrust bearing are fixed to the housing and bushing respectively, with no radial fit between the dynamic and stationary rings. Utility Model Content

[0005] In order to achieve radial fit between the dynamic ring and the stationary ring and improve the service life of the bearing, this application provides a radial limiting structure for a thrust bearing.

[0006] The radial limiting structure for a thrust bearing provided in this application adopts the following technical solution: A radial limiting structure for a thrust bearing includes a fixed housing, a bearing body, and a bushing. The fixed housing has a receiving cavity, the bushing is embedded in the receiving cavity, and the bearing body is embedded in the receiving cavity. The bearing body includes a first connecting ring, a roller, and a second connecting ring. The outer wall of the first connecting ring is in contact with the cavity wall, the inner wall of the first connecting ring is in contact with the outer wall of the bushing, and the inner wall of the second connecting ring is in contact with the outer wall of the bushing. The roller is connected between the first connecting ring and the second connecting ring.

[0007] By adopting the above technical solution, the bearing fits into the inner walls of the first and second connecting rings, achieving radial fit between the bearing's moving ring and stationary ring. This solves the problem of lack of radial constraint in traditional thrust bearings, improves shaft system stability, and extends the bearing's service life.

[0008] Preferably, an abutment ring is connected to one end of the bushing along the axial direction of the bushing, and the abutment ring abuts against the surface of the first connecting ring away from the second connecting ring.

[0009] By adopting the above technical solution, the abutting ring abuts against the first connecting ring, thereby achieving relative fixation of the bushing and the bearing body along the axis of the bearing body. This reduces the risk of the bearing body detaching from the bushing during use, which would lead to the loss of constraint of the bushing on the moving and fixed rings in the bearing, and improves the reliability of the equipment.

[0010] Preferably, the outer periphery of the bushing away from the abutment ring is provided with a first annular groove, and the inner wall of the second connecting ring is in contact with the groove wall of the first annular groove.

[0011] By adopting the above technical solution, the inner diameters of the first connecting ring and the second connecting ring are different, which makes it easier to distinguish the installation direction of the bearing body, improves the stability of the shaft system, and increases the service life of the bearing.

[0012] Preferably, it also includes a gun head housing and a ball screw, wherein the gun head housing is embedded in the receiving cavity, one end of the gun head housing abuts against the end of the bushing near the abutment ring, the ball screw is rotatably embedded in the receiving cavity, and one end of the ball screw abuts against the side surface of the second connecting ring away from the first connecting ring.

[0013] By adopting the above technical solution, the gun head housing is embedded in the receiving cavity and abuts against the bushing, and the ball screw is rotated and embedded in the receiving cavity and abuts against the second connecting ring. This achieves relative fixation between the bearing body, the gun head housing, and the ball screw along the bearing axis, reduces the possibility of relative movement of the bearing body along the bearing body axis during production, improves the service life of the bearing, and enhances the reliability of the equipment.

[0014] Preferably, the cavity wall on the side away from the gun head shell is provided with a first mounting groove, and the outer wall of the first connecting ring fits into the groove wall of the first mounting groove.

[0015] By adopting the above technical solution, it is easy to embed the bearing body and bushing into the first mounting groove. The bottom of the first mounting groove supports the bearing body, which facilitates the subsequent clamping of the gun head housing and roller screw to support the bearing body, thereby improving the convenience of equipment assembly.

[0016] Preferably, a second mounting groove is provided on the groove wall at the end of the first mounting groove away from the gun head housing, and a first chamfer is provided on the groove wall at the end of the first mounting groove near the second mounting groove, the first chamfer being used to abut against the outer wall of the first connecting ring.

[0017] By adopting the above technical solution, the first chamfer abuts against the first connecting ring, and the installation of the bearing body plays a guiding role, making it easier for the bearing to be embedded in the first mounting groove, thereby improving the convenience of equipment assembly.

[0018] Preferably, the end of the gun head housing away from the bushing extends out of the fixed housing, and a positioning ring is connected to the outer periphery of the gun head housing, the positioning ring abutting against the end of the fixed housing near the gun head housing.

[0019] By adopting the above technical solution, the positioning ring can position the gun head housing, ensuring the accuracy of its installation position, reducing the possibility of loosening between the bearing body and the roller screw due to improper installation or causing the bearing to rotate unevenly due to over-installation, and improving the reliability of the equipment.

[0020] Preferably, a first sealing groove is provided on the outer wall of the gun head housing, and the first sealing groove is used for embedding a sealing ring.

[0021] By adopting the above technical solution, the possibility of dust, liquids, etc. entering the receiving cavity through the gap between the gun head housing and the fixed housing is reduced, which could lead to damage to the internal components of the receiving cavity, and the sealing performance between the gun head housing and the fixed housing is improved.

[0022] Preferably, it also includes a cover plate, which is connected to the fixed housing and covers the second mounting slot opening.

[0023] By adopting the above technical solution, the cavity is sealed, reducing the possibility of damage to the internal components caused by external objects directly entering the cavity, and improving the reliability and service life of the equipment.

[0024] Preferably, the cover plate has a second sealing groove on the side near the fixed housing, the second sealing groove is arranged around the second mounting groove, and the second sealing groove is used for embedding the sealing ring.

[0025] By adopting the above technical solution, the possibility of dust, liquids, etc. entering the cavity through the gap between the cover plate and the fixed housing is reduced, which could lead to damage to the internal components of the cavity, and the sealing performance between the cover plate and the fixed housing is improved.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The bearing fits against the inner walls of the first and second connecting rings to achieve radial fit between the bearing's moving ring and stationary ring, solving the problem of lack of radial constraint in traditional thrust bearings, improving shaft system stability, and extending bearing service life; 2. The abutting ring abuts against the first connecting ring to achieve relative fixation of the bushing and the bearing body along the axis of the bearing body, reducing the risk of the bearing body detaching from the bushing during use, which would cause the bushing to lose its constraint on the moving and fixed rings in the bearing, and improving the reliability of the equipment. 3. The inner diameters of the first and second connecting rings are different, which makes it easier to distinguish the installation direction of the bearing body, improves the stability of the shaft system, and increases the service life of the bearing. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the radial limiting structure of a thrust bearing.

[0028] Figure 2 This is a cross-sectional view of the radial limiting structure of the thrust bearing.

[0029] Figure 3 This is a partial sectional view of the radial limiting structure of the thrust bearing, mainly showing the first connecting hole, the second connecting hole, the third connecting hole and the fourth connecting hole.

[0030] Figure 4 yes Figure 2 Enlarged view of point A in the middle.

[0031] Explanation of reference numerals in the attached figures: 1. Mounting body; 11. Fixed outer shell; 111. Receiving cavity; 112. First mounting groove; 113. Second mounting groove; 114. First chamfer; 115. Third mounting groove; 116. Connecting seat; 1161. First connecting hole; 117. Drive seat; 118. Drive groove; 12. Cover plate; 121. Second sealing groove; 122. Second connecting hole; 123. First connecting port; 124. Fourth sealing groove; 125. Third positioning groove; 13. Sealing plate; 131. Third connecting hole; 132. Sealing ring; 14. Fixed cover; 141. Fourth connecting hole; 142. Cavity; 143. First positioning groove; 144. Second positioning groove; 145. Third sealing groove; 146. Second connecting port; 2. Bushing; 21. First annular groove; 22. Abutment ring; 3. Bearing body; 31. First connecting ring; 32. Roller; 33. Second connecting ring; 4. Ball screw; 41. Gear ring; 5. Gun head housing; 51. Positioning ring; 52. First sealing groove; 6. Screw; 7. Positioning assembly; 71. Collar; 72. First bearing; 73. Washer ring. Detailed Implementation

[0032] The present application will be further described in detail below with reference to the accompanying drawings.

[0033] Reference Figure 1 This application discloses a radial limiting structure for a thrust bearing, including a mounting body 1. The mounting body 1 includes a fixed outer shell 11 with a circular cross-section. A connecting seat 116 with a square cross-section is fixedly connected to the outer wall of the fixed outer shell 11 at one end of its axis.

[0034] Reference Figure 1 and Figure 2 The fixed housing 11 is coaxially provided with a receiving cavity 111, which extends through the fixed housing 11 along its axis. A first mounting groove 112 is provided on the cavity wall near the connecting seat 116. A second mounting groove 113 is provided on the groove wall of the first mounting groove 112 near the connecting seat 116. A third mounting groove 115 is provided on the groove wall of the second mounting groove 113 near the connecting seat 116. A drive seat 117 is fixedly connected to the side wall of the connecting seat 116 perpendicular to the axis of the fixed housing 11. One end of the drive seat 117 is flush with the end of the fixed housing 11 near the connecting seat 116. A drive groove 118 is provided on the surface of the drive seat 117 near the end of the fixed housing 11 near the connecting seat 116, and the drive groove 118 communicates with the third mounting groove 115. The mounting body 1 also includes a cover plate 12, a sealing plate 13, and a fixing cover 14. The cover plate 12 is fixedly connected to the end of the fixing housing 11 near the connecting seat 116 and covers the openings of the third mounting groove 115 and the drive groove 118. A second sealing groove 121 is provided on the side surface of the cover plate 12 near the fixing housing 11. The second sealing groove 121 is arranged around the openings of the third mounting groove 115 and the drive groove 118 and is used for embedding a sealing ring. The sealing plate 13 is fixedly connected to the side surface of the cover plate 12 away from the fixing housing 11, and the fixing cover 14 is fixedly connected to the side surface of the sealing plate 13 away from the cover plate 12.

[0035] Reference Figure 3 The fixed cover 14 is provided with a plurality of fourth connecting holes 141, which are distributed at intervals along the circumference of the fixed cover 14. In this embodiment, there are four fourth connecting holes 141, which are distributed at the four corners of the fixed cover 14. The connecting seat 116 is provided with a first connecting hole 1161, the cover plate 12 is provided with a second connecting hole 122, and the sealing plate 13 is provided with a third connecting hole 131. The number of the second connecting holes 122, the third connecting holes 131 and the first connecting holes 1161 are the same as the number of the fourth connecting holes 141 and correspond one-to-one. The bolt passes through the first connecting hole 1161, the second connecting hole 122, the third connecting hole 131 and the fourth connecting hole 141 in sequence and is then threadedly connected to the nut to realize the fixed connection between the connecting seat 116, the cover plate 12, the sealing plate 13 and the fixed cover 14.

[0036] A radial limiting structure for a thrust bearing also includes a ball screw 4, a screw 6, and a positioning assembly 7. The cover plate 12 is provided with a first connecting port 123. The fixed cover 14 is provided with a cavity 142 on one side near the sealing plate 13. The cavity wall of the cavity 142 near one end of the cover plate 12 is provided with a first positioning groove 143. The groove wall of the first positioning groove 143 near one end of the cover plate 12 is provided with a second positioning groove 144. A sealing ring 132 is fixedly connected to the inner wall of the sealing plate 13. The two ends of the sealing ring 132 extend into the second positioning groove 144 and the first connecting port 123, respectively. The outer wall of the sealing ring 132 fits against the groove wall of the second positioning groove 144 and the inner wall of the first connecting port 123. The groove wall of the second positioning groove 144 near one end of the cover plate 12 is provided with a third sealing groove 145 for embedding a sealing ring. A fourth sealing groove 124 is provided on the inner wall of the first connecting port 123 near the fixed cover 14. The fourth sealing groove 124 is used for embedding the sealing ring. The ball screw 4 is coaxially rotatably embedded in the second mounting groove 113. The rotation axis of the ball screw 4 coincides with the axis of the receiving cavity 111. The end of the ball screw 4 away from the first mounting groove 112 passes through the first connecting port 123 and the sealing ring 132 in sequence and extends into the cavity 142. The positioning assembly 7 includes a collar 71, a first bearing 72 and a washer 73. The collar 71 is embedded in the first positioning groove 143. The outer wall of the collar 71 is in contact with the groove wall of the first positioning groove 143. One end of the collar 71 abuts against the bottom of the first positioning groove 143. The inner wall of the collar 71 is in contact with the outer wall of the ball screw 4. A toothed ring 41 is fixedly connected to the outer periphery of the ball screw 4. The toothed ring 41 is embedded in the third mounting groove 115. The surface of the cover plate 12 near the fixed housing 11 has a third positioning groove 125. A washer 73 is embedded in the third positioning groove 125. The surface of the washer 73 away from the toothed ring 41 abuts against the bottom of the third positioning groove 125. The outer wall of the washer 73 fits against the wall of the third positioning groove 125. A first bearing 72 is embedded in the third positioning groove 125. One end of the first bearing 72 abuts against the surface of the washer 73 away from the bottom of the third positioning groove 125. The other end of the first bearing 72 fits against the surface of the toothed ring 41 away from the bottom of the third mounting groove 115. The outer wall of the first bearing 72 fits against the wall of the third positioning groove 125. The inner wall of the first bearing 72 fits against the outer wall of the ball screw 4. The drive groove 118 is used for the gear to rotate and is used to drive the toothed ring 41 to rotate. The screw 6 is coaxially rotated and embedded inside the ball screw 4. The outer wall of the screw 6 is in contact with the inner wall of the ball screw 4. The bottom of the cavity 142 is provided with a second connecting port 146. One end of the screw 6 passes through the first connecting port 123, the sealing ring 132 and the second connecting port 146 in sequence and then extends out of the fixed outer shell 11.

[0037] Reference Figure 2 and Figure 4A radial limiting structure for a thrust bearing also includes a bushing 2, a bearing body 3, and a gun head housing 5. The bushing 2 is embedded in a receiving cavity 111, and one end of the bushing 2 near the ball screw 4 extends into a first mounting groove 112. The bearing body 3 is embedded in the first mounting groove 112. The bearing body 3 includes a first connecting ring 31, a roller 32, and a second connecting ring 33. The inner wall of the first connecting ring 31 fits against the outer wall of the bushing 2, and the outer wall of the first connecting ring 31 fits against the groove wall of the first mounting groove 112. A first chamfer 114 is provided at one end of the groove wall of the first mounting groove 112 near the second mounting groove 113. The first chamfer 114 is used to abut against the outer wall of the first connecting ring 31. The bushing 2 has a first annular groove 21 on its outer periphery near the end of the ball screw 4. The inner wall of the second connecting ring 33 fits against the groove wall of the first annular groove 21. The roller 32 is connected between the first connecting ring 31 and the second connecting ring 33. The surface of the second connecting ring 33 away from the first connecting ring 31 abuts against the end of the ball screw 4 near the bushing 2. An abutting ring 22 is fixedly connected to the outer periphery of the bushing 2 away from the ball screw 4. The abutting ring 22 abuts against the surface of the first connecting ring 31 away from the second connecting ring 33. One end of the gun head housing 5 is threaded to the end of the receiving cavity 111 away from the connecting seat 116. The end of the gun head housing 5 near the ball screw 4 abuts against the end of the bushing 2 away from the ball screw 4. The other end of the gun head housing 5 extends out of the fixed housing 11. A positioning ring 51 is fixedly connected to the gun head housing 5. The positioning ring 51 abuts against the end of the fixed housing 11 away from the connecting seat 116. The outer wall of the gun head housing 5 is provided with a first sealing groove 52. The side wall of the first sealing groove 52 away from the ball screw 4 is flush with the side surface of the positioning ring 51 close to the ball screw 4. The first sealing groove 52 is used for the sealing ring to be embedded.

[0038] The implementation principle of the radial limiting structure of a thrust bearing in this application embodiment is as follows: During installation, the bearing body 3 is sleeved on the outer periphery of the bushing 2, the inner wall of the first connecting ring 31 is in contact with the outer wall of the bushing 2, the inner wall of the second connecting ring 33 is in contact with the groove wall of the first ring groove 21, the bushing 2 and the bearing body 3 are embedded in the first mounting groove 112, the outer wall of the first connecting ring 31 is in contact with the groove wall of the first mounting groove 112, the first connecting ring 31 abuts against the bottom of the first mounting groove 112, the ball screw 4 and the screw 6 are embedded in the receiving cavity 111, the washer ring 73 and the first bearing 72 are sleeved on the outer periphery of the ball screw 4, the cover plate 12 is connected to the fixed outer shell 11, and the washer ring 73 is sleeved on the outer periphery of the ball screw 4. Ring 73 and first bearing 72 are embedded in third positioning groove 125. Sealing plate 13 is connected to cover plate 12. Sealing ring 132 is embedded in first connecting hole. Collar 71 is sleeved on the outer periphery of ball screw 4. Fixed cover 14 is connected to the side of sealing plate 13 away from cover plate 12. Collar 71 is embedded in first positioning groove 143. Sealing ring 132 fits against the groove wall of second positioning groove 144. Bolt passes through first connecting hole 1161, second connecting hole 122, third connecting hole 131 and fourth connecting hole 141 in sequence and is threaded to nut to realize the fixed connection between fixed housing 11, cover plate 12, sealing plate 13 and fixed cover 14.

[0039] The gun head housing 5 is threaded to the end of the fixed housing 11 away from the cover plate 12. The gun head housing 5 abuts against the bushing 2, pushing the second connecting ring 33 to abut against the end of the ball screw 4 near the gun head housing 5.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A radial limiting structure for a thrust bearing, characterized in that: The assembly includes a fixed housing (11), a bearing body (3), and a bushing (2); the fixed housing (11) has a receiving cavity (111); the bushing (2) is embedded in the receiving cavity (111); the bearing body (3) is embedded in the receiving cavity (111); the bearing body (3) includes a first connecting ring (31), a roller (32), and a second connecting ring (33); the outer wall of the first connecting ring (31) is in contact with the cavity wall of the receiving cavity (111); the inner wall of the first connecting ring (31) is in contact with the outer wall of the bushing (2); the inner wall of the second connecting ring (33) is in contact with the outer wall of the bushing (2); the roller (32) is connected between the first connecting ring (31) and the second connecting ring (33).

2. The radial limiting structure of the thrust bearing according to claim 1, characterized in that: The bushing (2) has an abutment ring (22) connected to one end of its outer periphery along the axis of the bushing (2); the abutment ring (22) abuts against the side surface of the first connecting ring (31) away from the second connecting ring (33).

3. The radial limiting structure of the thrust bearing according to claim 2, characterized in that: The bushing (2) has a first annular groove (21) on its outer periphery away from the abutment ring (22); the inner wall of the second connecting ring (33) is in contact with the groove wall of the first annular groove (21).

4. The radial limiting structure of the thrust bearing according to claim 2, characterized in that: It also includes a gun head housing (5) and a ball screw (4); the gun head housing (5) is embedded in the receiving cavity (111); one end of the gun head housing (5) abuts against the end of the bushing (2) near the abutment ring (22); the ball screw (4) is rotatably embedded in the receiving cavity (111); one end of the ball screw (4) abuts against the side surface of the second connecting ring (33) away from the first connecting ring (31).

5. The radial limiting structure of the thrust bearing according to claim 4, characterized in that: The cavity (111) has a first mounting groove (112) on the side of the cavity wall away from the gun head shell (5); the outer wall of the first connecting ring (31) fits against the groove wall of the first mounting groove (112).

6. The radial limiting structure of the thrust bearing according to claim 5, characterized in that: The first mounting groove (112) has a second mounting groove (113) at the end of the groove wall away from the gun head shell (5); the first mounting groove (112) has a first chamfer (114) at the end of the groove wall near the second mounting groove (113); the first chamfer (114) is used to abut against the outer wall of the first connecting ring (31).

7. The radial limiting structure of the thrust bearing according to claim 4, characterized in that: The end of the gun head shell (5) away from the bushing (2) extends out of the fixed shell (11); a positioning ring (51) is connected to the outer periphery of the gun head shell (5); the positioning ring (51) abuts against the end of the fixed shell (11) near the gun head shell (5).

8. The radial limiting structure of the thrust bearing according to claim 7, characterized in that: The gun head shell (5) has a first sealing groove (52) on its outer wall; the first sealing groove (52) is used for the embedding of the sealing ring.

9. The radial limiting structure of the thrust bearing according to claim 4, characterized in that: It also includes a cover plate (12); the cover plate (12) is connected to the fixed housing (11) and covers the opening of the second mounting groove (113).

10. The radial limiting structure of the thrust bearing according to claim 9, characterized in that: The cover plate (12) is provided with a second sealing groove (121) on the side near the fixed housing (11); the second sealing groove (121) is arranged around the second mounting groove (113); the second sealing groove (121) is used for the sealing ring to be embedded.

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