Rolling contact limiting structure between the one-way spline tube and the fixed sleeve

Abstract

This utility model discloses a rolling contact limiting structure between a one-way valve spline tube and a fixed sleeve, including a spline tube, a fixed sleeve, a insert, and a cover. The spline tube has an outer annular groove, the insert is installed on the fixed sleeve and partially extends into the outer annular groove, and the cover covers the outside of the fixed sleeve. The insert is installed on the fixed sleeve through an axial insertion member located between it and the fixed sleeve. A rolling element is provided on the portion of the insert extending into the outer annular groove. The rolling element is located between the insert and the outer annular groove, so that a rolling contact is formed between the insert and the spline tube. This utility model solves the problem of friction and wear between the insert and the spline tube through the rolling contact structure.

Description

Technical Field

[0001] This utility model belongs to the field of one-way device technology, and in particular relates to the rolling contact limiting structure between the one-way device spline tube and the fixed sleeve. Background Technology

[0002] In existing one-way clutches, the insert between the spline tube and the fixed sleeve directly extends into the outer annular groove for sliding contact. Under frequent start-stop or high-speed rotation conditions, continuous friction between the metals can easily lead to abnormal noise and accelerate the wear of the insert and spline groove. Long-term wear can cause deformation and breakage of the insert, and even cause one-way clutch failure. Especially when subjected to combined radial and axial loads, the traditional thick-walled structure of the insert makes it difficult to optimize the friction mode, and it is prone to hard interference with the groove wall during assembly, further aggravating wear. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides a rolling contact limiting structure between the spline tube of the one-way valve and the fixed sleeve. Through the rolling contact structure, the problem of friction and wear between the insert and the spline tube is solved.

[0004] Technical solution: To achieve the above objectives, the rolling contact limiting structure between the one-way spline tube and the fixed sleeve of this utility model includes a spline tube, a fixed sleeve, an insert and a cover. The spline tube is provided with an outer ring groove, the insert is installed on the fixed sleeve and partially extends into the outer ring groove, and the cover covers the outside of the fixed sleeve.

[0005] The insert is mounted on the fixed sleeve via an axial connector located between it and the fixed sleeve; the portion of the insert extending into the outer annular groove is provided with a rolling element; the rolling element is located between the insert and the outer annular groove, so that the insert and the spline tube form a rolling contact.

[0006] Furthermore, the axial insertion member includes insertion posts arranged in a circumferential array at the end of the fixed sleeve; the insertion piece is provided with insertion holes corresponding to the insertion posts; the insertion piece is installed on the fixed sleeve through the insertion engagement of the insertion posts and insertion holes.

[0007] Furthermore, the cover is fixed to the outside of the fixed sleeve, and the cover covers a portion of the insert in the axial direction to limit the insert in the axial direction.

[0008] Further, the rolling element includes a first rolling element and a second rolling element; the insert includes an integrally formed outer thick portion and an inner thin portion; the outer thick portion and the inner thin portion form a step on the axial end face facing the fixed sleeve, and the axial end face facing away from the fixed sleeve is a plane; the outer thick portion fits against the end face of the fixed sleeve and axially limits the rollers and flat springs inside the fixed sleeve; the inner thin portion extends into the outer annular groove; the first rolling element is circumferentially arranged on the inner edge of the inner thin portion and rolls in contact with the bottom of the outer annular groove; the second rolling element is circumferentially arranged on the axial end face of the inner thin portion facing the fixed sleeve and rolls in contact with the groove wall of the outer annular groove adjacent to the fixed sleeve.

[0009] Furthermore, a clearance structure is provided at the boundary between the outer thick portion and the inner thin portion to avoid the groove edge of the outer annular groove.

[0010] Furthermore, the avoidance structure is a rounded corner structure or a chamfered corner structure.

[0011] Furthermore, the rolling element is a steel ball that is movably embedded in the insert.

[0012] Furthermore, the insert consists of two pieces, each in the shape of a semi-circular ring, with the openings of the two semi-circular inserts facing each other to form a ring that encircles and fixes the sleeve.

[0013] Beneficial effects: This utility model, through the design of the rolling element at the insertion end of the insert, transforms the sliding friction between the spline tube and the insert into rolling friction, significantly reducing rotational resistance and metal-scratching noise, and extending service life; the first rolling element rolls in contact with the bottom of the groove to bear the radial load, while the second rolling element rolls in contact with the side groove wall to suppress axial movement friction and disperse composite stress; the inner thin part of the stepped insert provides installation space for the rolling element, while the outer thick part maintains rigid restraint on the internal parts, and the overall structure ensures reliability while reducing friction. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the spline tube and the fixed sleeve of the one-way valve, partially cut apart.

[0015] Figure 2 for Figure 1 Enlarged structural diagram of region A in the middle;

[0016] Figure 3 This is a schematic diagram of the insert structure. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] like Figure 1 As shown, the rolling contact limiting structure between the one-way valve spline tube and the fixed sleeve includes a spline tube 1, a fixed sleeve 2, a insert 3, and a cover 4. The spline tube 1 has an outer annular groove 10. The insert 3 is installed on the fixed sleeve 2 and partially extends into the outer annular groove 10. The cover 4 covers the outside of the fixed sleeve 2. The insert 3 is installed on the fixed sleeve 2 through an axial insertion member 5 located between it and the fixed sleeve 2. The portion of the insert 3 extending into the outer annular groove 10 is provided with a rolling element 6. The rolling element 6 is located between the insert 3 and the outer annular groove 10, so that the insert 3 and the spline tube 1 form a rolling contact. The rolling element 6 converts the sliding friction between the spline tube 1 and the insert 3 into rolling friction, significantly reducing the frictional resistance when the spline tube 1 and the fixed sleeve 2 rotate relative to each other, avoiding abnormal noise caused by direct metal-to-metal scraping, and reducing wear on the contact surface, thus extending the service life.

[0019] like Figure 2 As shown, the axial insertion member 5 includes insertion posts 51 arranged in a circumferential array at the end of the fixed sleeve 2; the insertion piece 3 is provided with insertion holes 31 corresponding to the insertion posts 51; the insertion piece 3 is installed on the fixed sleeve 2 through the insertion of the insertion posts 51 and the insertion holes 31. The circumferential array of insertion posts 51 provides uniform force, ensuring the coaxiality and installation stability of the insertion piece 3 and the fixed sleeve 2, and preventing skewing.

[0020] Regarding the axial connector 5, it should be noted that existing one-way connectors do not have a connecting component similar to the axial connector 5 of this invention between the insert and the fixed sleeve. The fit between the insert and the fixed sleeve is entirely positioned and constrained by the cover 4. Because the insert 3 of this invention is provided with a rolling element 6, the stability of the insert 3 resting on the fixed sleeve 2 (with the insert 3 and the fixed sleeve 2 in contact) is poor before the cover 4 is assembled. Therefore, the axial connector 5 is provided to pre-install the insert 3 with the rolling element 6 on the fixed sleeve 2 before assembling the cover 4, thereby ensuring the stability and accuracy of the coaxial installation of the insert 3 and the fixed sleeve 2.

[0021] like Figure 2 As shown, the cover 4 is fixed to the outside of the fixed sleeve 2, and the cover 4 covers part of the insert 3 in the axial direction to limit the insert 3 in the axial direction. By pressing the insert 3 in the axial direction by the cover 4, its axial movement is restricted, and the insert is prevented from loosening due to vibration. At the same time, it helps to fix the plug-in structure (axial plug-in 5).

[0022] like Figure 2 and Figure 3 As shown, the rolling element 6 includes a first rolling element 61 and a second rolling element 62. The insert 3 includes an integrally formed outer thick portion 3.1 and an inner thin portion 3.2. The inner thin portion 3.2 extends into the outer annular groove 10, and the inner diameter of the inner thin portion 3.2 is smaller than the outer diameter of the spline tube 1 at the bottom of the outer annular groove 10, so that a radial annular gap a is formed between the inner edge of the inner thin portion 3.2 and the bottom of the outer annular groove 10, reserving space for the first rolling element 61. The first rolling element 61 is circumferentially arranged in the radial annular gap a. An axial annular gap b is formed between the axial end face of the inner thin portion 3.2 facing the fixed sleeve 2 and the corresponding side wall of the outer annular groove 10, reserving space for the second rolling element 62. The second rolling element 62 is circumferentially arranged in the axial annular gap b.

[0023] The outer thick portion 3.1 and the inner thin portion 3.2 form a step on the axial end face facing the fixed sleeve 2. The outer thick portion 3.1 fits with the end face of the fixed sleeve 2 and axially limits the rollers and flat springs inside the fixed sleeve 2. The outer thick portion 3.1 ensures rigid limiting of the rollers and flat springs. The thinning structure of the inner thin portion 3.2 provides installation space for the second rolling element 62 and avoids interference with the groove wall. Furthermore, the outer thick portion 3.1 and the inner thin portion 3.2 are flat on the axial end face facing away from the fixed sleeve 2, which facilitates fitting with the cover 4.

[0024] The first rolling element 61 is circumferentially arrayed on the inner edge of the inner thin portion 3.2 and rolls in contact with the bottom of the outer annular groove 10; the second rolling element 62 is circumferentially arrayed on the axial end face of the inner thin portion 3.2 facing the fixed sleeve 2 and rolls in contact with the groove wall of the outer annular groove 10 adjacent to the fixed sleeve 2. The dual rolling elements are designed in separate areas with clear division of labor, specifically: the first rolling element 61 rolls in contact with the bottom of the groove: bearing the radial load of the spline tube 1, transforming the traditional surface contact into point contact rolling, and dispersing stress; the second rolling element 62 rolls in contact with the side groove wall: bearing the axial impact force and suppressing the axial movement friction between the insert 3 and the spline tube 1.

[0025] like Figure 2 As shown, a clearance structure 3.3 is provided at the boundary between the outer thick portion 3.1 and the inner thin portion 3.2 to avoid the edge of the groove of the outer annular groove 10. More specifically, the clearance structure 3.3 is a rounded corner structure or a chamfered structure. When the spline tube 1 and the fixed sleeve 2 rotate relative to each other, the clearance structure 3.3 can prevent the insert from colliding with the edge of the groove.

[0026] Preferably, the rolling element 6 is a steel ball movably embedded in the insert 3. The steel ball has low rolling resistance and high load-bearing capacity.

[0027] like Figure 3 As shown, the insert 3 consists of two pieces, each in the shape of a semi-circular ring. The split structure design reduces the difficulty of assembly. The openings of the two semi-circular insert 3 are arranged opposite each other to form a ring that surrounds the fixed sleeve 2.

[0028] In summary, this invention, through the design of rolling elements at the insert end, transforms the sliding friction between the spline tube and the insert into rolling friction, significantly reducing rotational resistance and metal-on-metal scraping noise, and extending service life. The first rolling element rolls in contact with the bottom of the groove to bear the radial load, while the second rolling element rolls in contact with the side groove wall to suppress axial movement friction and disperse composite stress. The movable steel ball ensures smooth rolling and adapts to changes in the contact surface. The thin inner part of the stepped insert provides installation space for the rolling element, while the thick outer part maintains rigid restraint on internal parts. The overall structure reduces friction while ensuring reliability.

[0029] 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 rolling contact limiting structure between a one-way spline tube and a fixed sleeve, comprising a spline tube (1), a fixed sleeve (2), a insert (3), and a cover (4). The spline tube (1) is provided with an outer ring groove (10). The insert (3) is installed on the fixed sleeve (2) and partially extends into the outer ring groove (10). The cover (4) covers the outside of the fixed sleeve (2). Its features are: The insert (3) is mounted on the fixed sleeve (2) by an axial connector (5) provided between it and the fixed sleeve (2); the portion of the insert (3) extending into the outer ring groove (10) is provided with a rolling element (6); the rolling element (6) is located between the insert (3) and the outer ring groove (10), so that the insert (3) and the spline tube (1) form a rolling contact.

2. The rolling contact limiting structure between the one-way spline tube and the fixed sleeve according to claim 1, characterized in that: The axial connector (5) includes a circumferential array of pins (51) arranged at the end of the fixed sleeve (2); the insert (3) is provided with a socket (31) corresponding to the pin (51); the insert (3) is installed on the fixed sleeve (2) through the insertion of the pin (51) and the socket (31).

3. The rolling contact limiting structure between the one-way spline tube and the fixed sleeve according to claim 2, characterized in that: The cover (4) is fixed to the outside of the fixed sleeve (2), and the cover (4) covers part of the insert (3) in the axial direction to limit the insert (3) in the axial direction.

4. The rolling contact limiting structure between the one-way spline tube and the fixed sleeve according to claim 1, characterized in that: The rolling element (6) includes a first rolling element (61) and a second rolling element (62); the insert (3) includes an integrally formed outer thick part (3.1) and an inner thin part (3.2); the outer thick part (3.1) and the inner thin part (3.2) form a step on the axial end face facing the fixed sleeve (2), and the axial end face facing away from the fixed sleeve (2) is a plane; the outer thick part (3.1) fits against the end face of the fixed sleeve (2) and axially limits the rollers and flat springs in the fixed sleeve (2); the inner thin part (3.2) extends into the outer ring groove (10); the first rolling element (61) is arranged in a circumferential array on the inner edge of the inner thin part (3.2) and rolls in contact with the bottom of the outer ring groove (10); the second rolling element (62) is arranged in a circumferential array on the axial end face of the inner thin part (3.2) facing the fixed sleeve (2) and rolls in contact with the groove wall of the outer ring groove (10) adjacent to the fixed sleeve (2).

5. The rolling contact limiting structure between the one-way spline tube and the fixed sleeve according to claim 4, characterized in that: The outer thick part (3.1) and the inner thin part (3.2) are provided with a clearance structure (3.3) to avoid the groove edge of the outer ring groove (10).

6. The rolling contact limiting structure between the one-way spline tube and the fixed sleeve according to claim 5, characterized in that: The avoidance structure (3.3) is a rounded corner structure or a chamfered corner structure.

7. The rolling contact limiting structure between the one-way spline tube and the fixed sleeve according to claim 1, characterized in that: The rolling element (6) is a steel ball that is movably embedded in the insert (3).

8. The rolling contact limiting structure between the one-way spline tube and the fixed sleeve according to any one of claims 1 to 7, characterized in that: The insert (3) consists of two pieces, each in the shape of a semi-circular ring. The two semi-circular inserts (3) are arranged with their openings facing each other to form a ring that encircles the fixed sleeve (2).

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