A needle roller bearing one-way valve with centrifugal compensation structure

Abstract

This utility model discloses a one-way device for needle roller bearings with a centrifugal compensation structure, including a spline tube and a composite bearing built into it. The composite bearing includes a middle ring and an end ring coaxially fixedly connected. Needles are evenly distributed circumferentially on the inner side of the middle ring. The end ring has radial holes and elastically built-in balls evenly distributed circumferentially. Under normal conditions, the balls extend out of the radial holes under radial elastic force and contact the drive spline shaft of the armature, making the spline tube coaxial with the drive spline shaft and forming a uniform radial clearance between the needle rollers and the drive spline shaft. During rotation, the balls retract into the radial holes under centrifugal force to overcome the radial elastic force, releasing the contact with the drive spline shaft and eliminating the radial clearance, allowing the drive spline shaft to roll into contact with the needle rollers. This utility model solves the problem of balancing assembly tolerance and high-speed transmission accuracy by using centrifugal force to drive the balls to dynamically compensate for the radial clearance, achieving reliable transmission with low vibration and wear.

Description

Technical Field

[0001] This utility model belongs to the field of one-way device technology, and in particular relates to a needle roller bearing one-way device with centrifugal compensation structure. Background Technology

[0002] Existing needle roller bearing one-way actuators require a tolerance clearance (radial clearance) to accommodate assembly tolerances when assembling the armature drive spline shaft, in order to avoid jamming. However, this clearance can lead to transmission eccentricity, vibration, and wear. Reducing the clearance, on the other hand, increases the assembly difficulty. Especially at high speeds, the impact noise caused by the clearance is significant, and traditional structures struggle to balance assembly tolerance with transmission accuracy. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides a one-way device for needle roller bearings with centrifugal compensation structure. It uses centrifugal force to drive the balls to dynamically compensate for radial clearance, solves the problem of difficulty in balancing assembly tolerance and high-speed transmission accuracy, and achieves reliable transmission with low vibration and wear.

[0004] Technical solution: To achieve the above objectives, this utility model provides a one-way device for a needle roller bearing with a centrifugal compensation structure, comprising a spline tube and a composite bearing built into it. The composite bearing includes a middle ring and an end ring coaxially fixedly connected; needle rollers are evenly distributed circumferentially on the inner side of the middle ring; and radial holes and elastically built-in balls are evenly distributed circumferentially on the end ring.

[0005] Under normal conditions, the ball bearings extend out of the radial hole and contact the drive spline shaft of the armature under radial elastic force, making the spline tube coaxial with the drive spline shaft and forming a uniform radial gap between the needle roller and the drive spline shaft.

[0006] During rotation, the ball bearings are subjected to centrifugal force to overcome radial elastic force and retract into the radial hole, releasing the contact with the drive spline shaft and eliminating the radial clearance, so that the drive spline shaft and the needle rollers make rolling contact.

[0007] Furthermore, the end rings are a pair, symmetrically distributed at the two axial ends of the middle ring.

[0008] Furthermore, an internal hexagon screw is provided between the middle ring and the end ring, and the end ring is fastened to the end of the middle ring by the internal hexagon screw.

[0009] Furthermore, the socket head cap screw has an integrally formed shaft;

[0010] The axial end face of the needle roller is provided with a shaft hole at its center;

[0011] When the hex socket screw is screwed in, its shaft is inserted into the shaft hole on the end face of the needle roller, forming the shaft of the needle roller.

[0012] Furthermore, an elastic element is provided inside the radial hole, and the ball provides radial elastic force through the elastic element.

[0013] Furthermore, the radial hole penetrates the end ring, and a flat-mouthed screw plug is provided at the opening of the radial hole on the outside of the end ring to support the elastic element.

[0014] Furthermore, the radial hole located inside the end ring has a closing structure to prevent the ball from falling out.

[0015] Furthermore, the elastic element is a helical spring.

[0016] Beneficial effects: The ball bearings of this one-way valve extend out of the radial hole under elastic force, automatically compensating for tolerances and ensuring that the spline tube and the drive spline shaft of the armature are coaxial, forming a uniform radial clearance to avoid uneven wear; when rotating at high speed, the ball bearings retract under centrifugal force, eliminating the clearance and allowing the drive spline shaft to directly contact the needle rollers, significantly reducing vibration noise and wear; the symmetrical layout of the end rings enhances radial stability, and the integrated design of the screw shaft simultaneously realizes the functions of end ring fastening and needle roller rotation, reducing parts and improving structural compactness. Attached Figure Description

[0017] Figure 1 A schematic diagram of the radial cross-section of the spline tube of a one-way valve;

[0018] Figure 2 for Figure 1 Enlarged structural diagram of region A in the middle;

[0019] Figure 3 A schematic diagram of the axially cut structure of the spline tube of a one-way valve;

[0020] Figure 4 for Figure 3 A magnified schematic diagram of the structure of region B in the middle. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] like Figure 1 , Figure 3 and Figure 4 As shown, a one-way device with a needle roller bearing and centrifugal compensation structure includes a spline tube 1 and a composite bearing 2 built into it. The composite bearing 2 includes a middle ring 3 and an end ring 4 coaxially fixedly connected. Needle rollers 31 are evenly distributed circumferentially on the inner side of the middle ring 3. The end ring 4 is evenly distributed with radial holes 40 and elastically built-in balls 41. This achieves functional integration of the needle rollers 31 and balls 41, with the middle ring 3 undertaking the main drive and the end ring 4 providing dynamic self-alignment.

[0023] Under normal conditions, the ball bearing 41 extends out of the radial hole 40 under radial elastic force, contacting the drive spline shaft of the armature, making the spline tube 1 coaxial with the drive spline shaft, and forming a uniform radial clearance between the needle roller 31 and the drive spline shaft. During rotation, the ball bearing 41 retracts into the radial hole 40 under centrifugal force, releasing its contact with the drive spline shaft and eliminating the radial clearance, allowing the drive spline shaft and needle roller 31 to roll in contact. The ball bearing 41 extends under radial elastic force under normal conditions, automatically compensating for assembly tolerances and ensuring that the spline tube 1 and drive spline shaft are initially coaxial, thus forming a uniform radial clearance and preventing uneven wear. During rotation, the ball bearing 41 retracts under centrifugal force, eliminating the radial clearance and allowing the needle roller 31 to directly contact the drive spline shaft, converting sliding friction into pure rolling friction and reducing high-speed transmission wear.

[0024] More specifically, the end rings 4 are a pair, symmetrically distributed at the two axial ends of the middle ring 3. The double end ring structure provides balanced radial support force, prevents axial wobble of the drive spline shaft, and enhances coaxial stability.

[0025] like Figure 2 As shown, an internal hexagon screw 5 is provided between the middle ring 3 and the end ring 4. The end ring 4 is fastened to the end of the middle ring 3 by the internal hexagon screw 5. The internal hexagon screw 5 fastens both the end ring 4 and the middle ring 3. The internal hexagon screw 5 has an integrally formed shaft body 50. The center of the axial end face of the needle roller 31 is provided with a shaft hole 310. When the internal hexagon screw 5 is screwed in, its shaft body 50 is inserted into the shaft hole 310 on the end face of the needle roller 31, forming the rotating shaft of the needle roller, eliminating the need for an independent bearing structure, reducing parts and simplifying assembly.

[0026] like Figure 4 As shown, an elastic element 42 is provided inside the radial hole 40, and the ball 41 is provided with radial elastic force through the elastic element 42 to ensure the sensitivity of the ball 41's extension and contraction response. The radial hole 40 penetrates the end ring 4, and a flat-mouthed screw plug 43 is provided at the opening of the radial hole 40 on the outer side of the end ring 4 to support the elastic element 42. The opening of the radial hole 40 on the inner side of the end ring 4 is provided with a closing structure to prevent the ball 41 from falling out. The flat-mouthed screw plug 43 limits the elastic element 42, and at the same time, the closing structure prevents the ball 41 from falling out, improving reliability. As a preferred embodiment, the elastic element 42 is a helical spring, which is low in cost and has linearly controllable elastic force.

[0027] In summary, the ball bearing 41 of this utility model extends out of the radial hole 40 under elastic force, automatically compensating for tolerances and ensuring that the spline tube 1 and the drive spline shaft of the armature are coaxial, forming a uniform radial clearance to avoid uneven wear; when rotating at high speed, the ball bearing 41 retracts under centrifugal force, eliminating the clearance and allowing the drive spline shaft to directly roll and contact the needle roller 31, significantly reducing vibration noise and wear; the symmetrical layout of the end ring 4 enhances radial stability, and the integrated design of the screw shaft simultaneously realizes the functions of end ring 4 fastening and needle roller 41 rotation shaft, reducing parts and improving structural compactness; the elastic element 42 and the closing structure ensure the reliability of ball bearing 41 extension and contraction, extending service life.

[0028] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A needle bearing one-way device with centrifugal compensation, comprising a splined tube (1) and a composite bearing (2) built into it, characterized in that: The composite bearing (2) includes a middle ring (3) and an end ring (4) that are coaxially fixedly connected; the middle ring (3) has needle rollers (31) evenly distributed on its inner circumference; the end ring (4) has radial holes (40) and elastically built-in balls (41) evenly distributed on its circumference. Under normal conditions, the ball (41) is subjected to radial elastic force and extends out of the radial hole (40) to contact the drive spline shaft of the armature, so that the spline tube (1) is coaxial with the drive spline shaft and a uniform radial gap is formed between the needle (31) and the drive spline shaft. When rotating, the ball (41) is overcoming the radial elastic force by centrifugal force and retracts into the radial hole (40), releasing the contact with the drive spline shaft and eliminating the radial clearance, so that the drive spline shaft and the needle roller (31) make rolling contact.

2. The one-way roller bearing with centrifugal compensation according to claim 1, characterized in that: The end rings (4) are a pair, symmetrically distributed at the two axial ends of the middle ring (3).

3. The one-way roller bearing with centrifugal compensation according to claim 1 or 2, characterized in that: An internal hexagon screw (5) is provided between the middle ring (3) and the end ring (4), and the end ring (4) is fastened to the end of the middle ring (3) by the internal hexagon screw (5).

4. The one-way roller bearing with centrifugal compensation according to claim 3, characterized in that: The internal hex screw (5) has an integrally formed shaft (50). The axial end face of the needle roller (31) is provided with a shaft hole (310). When the internal hex screw (5) is screwed in, its shaft (50) is inserted into the shaft hole (310) on the end face of the needle roller (31), forming the rotating shaft of the needle roller.

5. The one-way roller bearing with centrifugal compensation according to claim 1, characterized in that: An elastic element (42) is provided inside the radial hole (40), and the ball (41) provides radial elastic force through the elastic element (42).

6. The one-way roller bearing with centrifugal compensation according to claim 5, characterized in that: The radial hole (40) passes through the end ring (4), and a flat-mouth screw plug (43) is provided at the opening of the radial hole (40) on the outside of the end ring (4) to support the elastic element (42).

7. The one-way roller bearing with centrifugal compensation according to claim 6, characterized in that: The radial hole (40) located inside the end ring (4) has a closing structure to prevent the ball (41) from falling off.

8. A needle bearing one-way device with centrifugal compensation according to claim 5 or 6 or 7, characterized in that: The elastic element (42) is a helical spring.

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