Tensioning wheel

Abstract

The tensioning wheel comprises a support, a connecting shaft and a bearing assembly, the connecting shaft is connected to the support, the bearing assembly comprises an inner ring, an outer ring and balls, the inner ring is coaxially connected to the periphery of the connecting shaft, the outer ring is coaxially connected to the periphery of the inner ring, the outer wall of the outer ring is used for abutting against a belt, and the balls are connected between the inner ring and the outer ring. The outer ring directly abuts against the belt, the possibility that the belt shakes due to the fact that the belt wheel and the bearing outer ring play is reduced, the stability of the tensioning wheel for tensioning the belt is improved, the reliability of the tensioning wheel is improved, the structure of the tensioning wheel is simplified, the press-fitting procedure of the tensioning wheel is simplified, and the production efficiency of the tensioning wheel is improved.

Description

Technical Field

[0001] The present application relates to the field of tensioning pulleys, and in particular to a tensioning pulley. Background Art

[0002] The tensioner is a belt tensioning device used in automotive transmission systems. It consists primarily of a fixed housing, a tensioning arm, a pulley body, a torsion spring, a rolling bearing, and a spring sleeve. It automatically adjusts the tension according to the varying tightness of the belt, ensuring a stable, safe, and reliable transmission system.

[0003] Reference Figure 1 The existing tensioner includes an existing bearing 01, an existing bracket 02 and a pulley 03. The inner ring of the existing bearing 01 is connected to the existing bracket 02. The existing bearing 01 adopts a double-groove bearing. The pulley 03 is fastened to the outer ring of the existing bearing 01, and the belt is abutted by the pulley 03. The reliability of the tensioner structure is affected by the stability of the connection between the pulley and the double-groove bearing. There is a situation where the pulley moves relative to the double-groove bearing, causing the belt to shake, affecting the normal use of the tensioner. Utility Model Content

[0004] In order to improve the stability of the tensioning belt of the tensioning wheel and improve the reliability of the tensioning wheel, the present application provides a tensioning wheel.

[0005] The present application provides a tensioning pulley adopting the following technical solution:

[0006] A tensioning pulley includes a bracket, a connecting shaft and a bearing assembly, wherein the connecting shaft is connected to the bracket, and the bearing assembly includes an inner ring, an outer ring and balls, wherein the inner ring is coaxially connected to the outer periphery of the connecting shaft, and the outer ring is coaxially connected to the outer periphery of the inner ring, the outer wall of the outer ring is used to abut the belt, and the balls are connected between the inner ring and the outer ring.

[0007] By adopting the above technical solution, the outer ring is directly in contact with the belt, which reduces the possibility of belt shaking caused by the movement of the pulley and the outer ring of the bearing, improves the stability of the tensioning belt of the tensioning wheel, improves the reliability of the tensioning wheel, simplifies the structure of the tensioning wheel, simplifies the pressing process of the tensioning wheel, and improves the production efficiency of the tensioning wheel.

[0008] Preferably, one end of the outer ring along the axis of the outer ring is coaxially connected to a convex ring, and the outer wall of the convex ring is flush with the outer wall of the outer ring.

[0009] By adopting the above technical solution, a convex ring is coaxially connected to one end of the outer ring along the axis of the outer ring, and the outer wall of the convex ring is flush with the outer wall of the outer ring. The outer wall of the convex ring and the outer wall of the outer ring abut the belt, thereby increasing the contact area between the tensioner and the belt, reducing the possibility of the belt deflecting or slipping during use, improving the tensioning effect and stability of the tensioner, and improving the reliability of the transmission system.

[0010] Preferably, two convex rings are provided, and the two convex rings are symmetrically distributed along the axis of the outer ring.

[0011] By adopting the above technical solution, the contact area between the outer ring and the belt is increased, the stability of the connection between the tensioner and the belt is improved, and the two convex rings are symmetrically distributed along the axis of the outer ring, which reduces the possibility of the belt applying unilateral force on the outer ring, causing the outer ring to deflect and causing the bearing to jam, thereby improving the reliability of the tensioner.

[0012] Preferably, the bracket is provided with a fixing hole, one end of the connecting shaft is coaxially embedded in the fixing hole, and a first chamfer is provided on the hole wall of the fixing hole away from the end of the bearing assembly.

[0013] By adopting the above technical solution, the connecting shaft and the bracket can be detachably connected, and the connecting shaft and the bracket can be replaced as needed, thereby improving the service life of the tensioning wheel. The first chamfer is used for the connecting shaft to abut and guide the connecting shaft, thereby improving the assembly efficiency of the tensioning wheel.

[0014] Preferably, a first rounded corner is provided at one end of the connecting shaft away from the bracket.

[0015] By adopting the above technical solution, the first fillet is used to abut against the first chamfer or the inner ring, guiding the assembly of the connecting shaft and the bracket and the assembly of the inner ring and the connecting shaft, thereby improving assembly efficiency.

[0016] Preferably, the bearing assembly further includes a sealing ring connected between the inner ring and the outer ring. Two sealing rings are provided, and the two sealing rings are distributed on both sides of the ball along the axis of the outer ring. The two sealing rings, the inner ring and the outer ring together form a cavity.

[0017] By adopting this technical solution, two sealing rings are connected between the inner and outer rings. These two sealing rings are located on either side of the ball, preventing dust and moisture from entering the bearing interior and extending the service life of the bearing assembly. The cavity enclosed by the sealing rings, the inner ring, and the outer ring is used to store grease, reducing wear between the inner and outer rings and extending the service life of the tensioner.

[0018] Preferably, the sealing ring includes a skeleton and an outer layer, the outer layer is connected to the outer periphery of the skeleton, the outer wall of the outer layer is pressed against the inner wall of the outer ring, and the inner wall of the outer layer is pressed against the outer wall of the inner ring.

[0019] By adopting the above technical solution, the skeleton plays a supporting role, the outer layer is wrapped around the outer periphery of the skeleton, the outer wall of the outer layer is pressed against the inner wall of the outer ring, and the inner wall of the outer layer is pressed against the outer wall of the inner ring, thereby improving the sealing effect between the inner ring and the outer ring, improving the service life of the bearing assembly, and thereby improving the service life of the tensioner.

[0020] Preferably, inner ring grooves are provided on the outer wall of the inner ring, the number of the inner ring grooves is the same as the number of sealing rings and corresponds one to one, the inner ring grooves are used for the inner wall of the outer cladding layer to be embedded, and outer ring grooves are provided on the inner wall of the outer ring, the number of the outer ring grooves is the same as the number of sealing rings and corresponds one to one, and the outer wall of the outer cladding layer is embedded in the outer ring grooves.

[0021] By adopting the above technical solution, an inner ring groove is provided on the outer wall of the inner ring, an outer ring groove is provided on the inner wall of the outer ring, and both sides of the outer cladding are respectively embedded in the outer ring groove and the inner ring groove, thereby realizing relative fixation of the sealing ring and the outer ring and the inner ring along the axial direction, improving the stability of the connection between the sealing ring and the outer ring and the inner ring, and improving the reliability of the tensioner.

[0022] Preferably, a second chamfer is provided on the outer wall of the outer cladding, the second chamfer is located on a side of the outer cladding close to the ball, and the second chamfer is used to abut against the inner wall of the outer ring.

[0023] By adopting the above technical solution, the second chamfer abuts the inner wall of the outer ring, and the inner wall of the outer ring squeezes the outer cladding to deform the outer cladding. When the outer cladding is aligned with the outer ring groove, the outer cladding returns to its original shape and is embedded in the outer ring groove, thereby realizing the installation of the sealing ring. The second chamfer plays a guiding role in the installation of the sealing ring, thereby improving assembly efficiency.

[0024] Preferably, the bearing assembly adopts a single hook bearing

[0025] By adopting the above technical solution and using a single hook bearing, the production cost of the tensioning pulley is reduced.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The outer ring directly contacts the belt, reducing the possibility of belt shaking caused by the movement of the pulley and the outer ring of the bearing, improving the stability of the tensioning belt of the tensioning pulley, improving the reliability of the tensioning pulley, simplifying the tensioning pulley structure, simplifying the tensioning pulley press-fitting process, and improving the production efficiency of the tensioning pulley;

[0028] 2. A convex ring is coaxially connected to one end of the outer ring along the axis of the outer ring. The outer wall of the convex ring is flush with the outer wall of the outer ring. The outer wall of the convex ring and the outer wall of the outer ring abut the belt, increasing the contact area between the tensioner and the belt, reducing the possibility of belt deviation or slippage during use, improving the tensioning effect and stability of the tensioner, and enhancing the reliability of the transmission system;

[0029] 3. Two sealing rings are connected between the inner and outer rings. The two sealing rings are located on both sides of the ball to prevent external dust and moisture from entering the bearing interior, thereby increasing the service life of the bearing assembly. The cavity enclosed by the sealing ring, the inner ring, and the outer ring is used to store grease, reducing wear between the inner and outer rings and extending the service life of the tensioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a sectional view of an existing tensioning pulley.

[0031] Figure 2 It is a structural diagram of the tensioner.

[0032] Figure 3 It is a cross-sectional view of the tensioner.

[0033] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0034] Description of reference numerals:

[0035] 1. Bracket; 11. Fixing hole; 12. First chamfer; 13. Mounting hole; 14. Arc groove; 15. Pin hole;

[0036] 2. Connecting shaft; 21. First fillet; 22. Adjustment slot;

[0037] 3. Bearing assembly; 31. Inner ring; 311. Second fillet; 312. Inner groove; 313. Second embedded groove; 314. Inner ring groove; 32. Outer ring; 321. Raised ring; 322. Outer groove; 323. First embedded groove; 324. Outer ring groove; 33. Ball; 34. Sealing ring; 341. Skeleton; 3411. Support section; 3412. Abutment section; 342. Outer cladding; 3421. Block; 34211. Second chamfer; 3422. First abutment ring; 3423. Second abutment ring; 3424. Accommodation groove; 35. Cage;

[0038] 4. Positioning pin;

[0039] 01. Existing bearing; 02. Existing bracket; 03. Pulley. DETAILED DESCRIPTION

[0040] The present application is further described in detail below with reference to the accompanying drawings.

[0041] Reference Figure 2 The present application discloses an idler pulley including a bracket 1 and a positioning pin 4. The bracket 1 is provided with a mounting hole 13 that extends through the bracket 1 along its sliding direction. The bracket 1 is provided with an arcuate groove 14 centered about the axis of the mounting hole 13. The bracket 1 is provided with a pin hole 15 located between the mounting hole 13 and the arcuate groove 14. One end of the positioning pin 4 is coaxially embedded in the pin hole 15, and the other end of the positioning pin 4 extends out of the pin hole 15.

[0042] Reference Figure 2 and Figure 3A tensioning pulley also includes a connecting shaft 2. A bracket 1 is provided with a fixing hole 11, which extends through the bracket 1 along its thickness. One end of the connecting shaft 2 is coaxially embedded in the fixing hole 11 and is threadedly connected to the fixing hole 11. The other end of the connecting shaft 2 extends out of the fixing hole 11. An adjustment slot 22 is provided at the end of the connecting shaft 2 near the bracket 1. The cross-section of the adjustment slot 22 is hexagonal. A first chamfer 12 is provided on the wall of the fixing hole 11 near the end of the adjustment slot 22. The first chamfer 12 is used to abut against the end of the connecting shaft 2 away from the adjustment slot 22.

[0043] A tensioning pulley also includes a bearing assembly 3. The bearing assembly 3 comprises an inner ring 31, an outer ring 32, a retainer 35, and balls 33. The inner ring 31 is coaxially fixedly connected to the outer circumference of the connecting shaft 2, with the inner wall of the inner ring 31 abutting against the outer wall of the connecting shaft 2. In this embodiment, the inner wall of the inner ring 31 and the connecting shaft 2 have an interference fit. A first fillet 21 is provided on the outer circumference of the end of the connecting shaft 2 away from the adjustment groove 22. Second fillets 311 are provided on the inner wall of the inner ring 31 at both ends along the axis of the inner ring 31, which are designed to abut against the first fillet 21. The outer ring 32 is coaxially rotatably connected to the outer circumference of the inner ring 31, with the outer wall of the outer ring 32 abutting against the belt. A raised ring 321 is fixedly connected to one end of the outer ring 32 along the axis of the outer ring 32, with the outer wall of the raised ring 321 flush with the outer wall of the outer ring 32. Two raised rings 321 are provided, symmetrically distributed along the axis of the outer ring 32. A plurality of balls 33 are connected between the outer ring 32 and the inner ring 31. These balls 33 are spaced circumferentially around the axis of the inner ring 31. In this embodiment, nine balls 33 are evenly distributed around the axis of the inner ring 31. An annular inner groove 312 is defined on the outer wall of the inner ring 31, while an annular outer groove 322 is defined on the inner wall of the outer ring 32. The balls 33 are embedded in both the inner groove 312 and the outer groove 322. A retainer 35 is located between the inner ring 31 and the outer ring 32 and is connected to the balls 33. In this embodiment, the bearing assembly 3 utilizes a single-hook bearing.

[0044] Reference Figure 3 and Figure 4The bearing assembly 3 also includes a sealing ring 34 connected between the inner ring 31 and the outer ring 32. Two sealing rings 34 are provided, one on each side of the ball bearing 33 along the axis of the outer ring 32. The two sealing rings 34, the inner ring 31, and the outer ring 32 together form a cavity. The sealing ring 34 comprises a frame 341 and an outer cladding 342. The frame 341 is annular and has an L-shaped cross-section. The frame 341 includes a support section 3411 and an abutment section 3412. One end of the abutment section 3412 is fixed to the end of the support section 3411 near the outer ring 32, while the other end of the abutment section 3412 is located on the side of the support section 3411 near the other sealing ring 34. The inner wall of the outer ring 32 is provided with first annular grooves 323 at each end along the axis of the outer ring 32. The abutment section 3412 is embedded in the first grooves 323. A receiving groove 3424 is defined on the outer surface of the outer covering 342, adjacent to the other sealing ring 34. The frame 341 is embedded in the receiving groove 3424. In this embodiment, the outer covering 342 is made of rubber. One end of the outer covering 342 is embedded in the first embedding groove 323. The outer annular groove 324 is defined on the wall of the first embedding groove 323. A clamping block 3421 is fixedly connected to the outer periphery of the outer covering 342. The clamping block 3421 is embedded in the outer annular groove 324, with the side of the clamping block 3421 facing away from the outer covering 342 abutting the bottom of the outer annular groove 324. A second chamfer 34211 is defined on the outer wall of the clamping block 3421. The second chamfer 34211 is located on the side of the clamping block 3421 adjacent to the bottom of the first embedding groove 323 and is configured to abut the wall of the first embedding groove 323. A second annular groove 313 is defined on the outer wall of the inner ring 31 at each end along the axis of the inner ring 31. A first abutting ring 3422 is fixedly connected to the inner wall of the outer sheath 342, away from the bottom of the second groove 313. The first abutting ring 3422 abuts the wall of the second groove 313. A second abutting ring 3423 is fixedly connected to the other inner wall of the outer sheath 342. An inner groove 314 is defined in the wall of the second groove 313. The wall of the inner groove 314, which is adjacent to the other sealing ring 34, is flush with the bottom of the second groove 313. The second abutting ring 3423 extends into the inner groove 314 on the side away from the outer sheath 342, and the end of the second abutting ring 3423, which is away from the outer sheath 342, abuts the bottom of the second groove 313.

[0045] The working principle of the tensioner according to the embodiment of the present application is as follows: during assembly, the first fillet 21 abuts the first chamfer 12, allowing the connecting shaft 2 to be inserted into the fixing hole 11. The connecting shaft 2 then passes through the fixing hole 11. A hexagonal wrench is inserted into the adjustment groove 22, and the connecting wrench is rotated to rotate the connecting shaft 2, thereby threading the connecting shaft 2 and the bracket 1. The second abutting ring 3423 is inserted into the inner ring groove 314, allowing the first abutting ring 3422 to abut the wall of the second embedding groove 313. The sealing ring 34 is rotated so that the first chamfer 12 abuts the wall of the first embedding groove 323, squeezing the clamping block 3421. When the clamping block 3421 is aligned with the outer ring groove 324, it is inserted into the outer ring groove 324, and the outer wall of the clamping block 3421 abuts the bottom of the outer ring groove 324. The bearing assembly 3 is then sleeved onto the outer circumference of the connecting shaft 2, and the inner wall of the inner ring 31 is interference fit with the connecting shaft 2, thereby achieving relative fixation between the inner ring 31 and the connecting shaft 2. Align the mounting hole 13 and the arc-shaped groove 14 with the connecting hole where the frame is mounted, and thread the bolts through the mounting hole 13 and the arc-shaped groove 14 to connect with the connecting hole. Rotate the bracket 1 around the axis of the mounting hole 13 so that the outer wall of the outer ring 32 abuts against the belt, and tighten the bolts to achieve relative fixation of the tensioner and the frame.

[0046] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A tensioning pulley, characterized in that: The invention comprises a bracket (1), a connecting shaft (2) and a bearing assembly (3); the connecting shaft (2) is connected to the bracket (1); the bearing assembly (3) comprises an inner ring (31), an outer ring (32) and a ball (33); the inner ring (31) is coaxially connected to the outer periphery of the connecting shaft (2); the outer ring (32) is coaxially connected to the outer periphery of the inner ring (31); the outer wall of the outer ring (32) is used to abut against a belt; and the ball (33) is connected between the inner ring (31) and the outer ring (32).

2. The tensioning pulley according to claim 1, characterized in that: One end of the outer ring (32) along the axis of the outer ring (32) is coaxially connected to a convex ring (321); the outer wall of the convex ring (321) is flush with the outer wall of the outer ring (32).

3. The tensioning pulley according to claim 2, characterized in that: Two convex rings (321) are provided; the two convex rings (321) are symmetrically distributed along the axis direction of the outer ring (32).

4. The tensioning pulley according to claim 1, characterized in that: The bracket (1) is provided with a fixing hole (11); one end of the connecting shaft (2) is coaxially embedded in the fixing hole (11); and a first chamfer (12) is provided at a hole wall of the fixing hole (11) at one end away from the bearing assembly (3).

5. The tensioning pulley according to claim 1, characterized in that: An end of the connecting shaft (2) away from the bracket (1) is provided with a first rounded corner (21).

6. The tensioning pulley according to claim 1, characterized in that: The bearing assembly (3) further includes a sealing ring (34); the sealing ring (34) is connected between the inner ring (31) and the outer ring (32); two sealing rings (34) are provided; the two sealing rings (34) are distributed on both sides of the ball (33) along the axis direction of the outer ring (32); the two sealing rings (34), the inner ring (31) and the outer ring (32) together form a cavity.

7. The tensioning pulley according to claim 6, characterized in that: The sealing ring (34) comprises a skeleton (341) and an outer layer (342); the outer layer (342) is connected to the outer periphery of the skeleton (341); the outer wall of the outer layer (342) is pressed against the inner wall of the outer ring (32); and the inner wall of the outer layer (342) is pressed against the outer wall of the inner ring (31).

8. The tensioning pulley according to claim 7, characterized in that: The inner ring (31) is provided with an inner ring groove (314) on the outer wall; the number of the inner ring grooves (314) is the same as the number of the sealing rings (34) and corresponds one to one; the inner ring grooves (314) are used for the inner wall of the outer cladding layer (342) to be embedded; the outer ring groove (324) is provided on the inner wall of the outer ring (32); the number of the outer ring grooves (324) is the same as the number of the sealing rings (34) and corresponds one to one; the outer wall of the outer cladding layer (342) is embedded in the outer ring groove (324).

9. The tensioning pulley according to claim 8, characterized in that: A second chamfer (34211) is provided on the outer wall of the outer cladding (342); the second chamfer (34211) is located on a side of the outer cladding (342) close to the ball (33); the second chamfer (34211) is used to abut against the inner wall of the outer ring (32).

10. The tensioning pulley according to claim 1, characterized in that: The bearing assembly (3) adopts a single hook bearing.

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