Rectangular spline assembly oil seal lip scratch protection device

Abstract

The utility model relates to the technical field of protection device, concretely relates to a rectangular spline assembly oil seal anti-lip scratch protection device. The utility model discloses an oil seal protection sleeve and rectangular spline shaft sleeved in the inside of oil seal protection sleeve, the arc key groove of oil seal protection sleeve extends along the axial direction and forms arc groove body, and the inner wall of arc groove body is provided with the smooth transition guide curve I, the guide protrusion of rectangular spline shaft and the outer wall of threaded shaft are equipped with the limiting shoulder, and the adjacent limiting shoulder forms the guide recess, and the guide recess is provided with the smooth transition guide curve II, the arc protrusion slides to the guide recess along the guide protrusion, the guide curve II of arc protrusion and the guide curve II of guide recess are adapted, and realize the axial location by the limiting shoulder. The utility model constructs the physical barrier through oil seal protection sleeve, makes oil seal lip avoid the metal sharp edge on rectangular spline shaft, and the oil leakage and air leakage problem caused by the metal sharp edge scratch oil seal lip is eliminated, and the effective guarantee sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of protection device technology, specifically to a protective device for preventing lip scratches on a rectangular spline assembly oil seal. Background Technology

[0002] In the field of automotive parts assembly, the assembly of rectangular splined shafts and oil seals is common and critical, as their sealing effect directly affects the performance and lifespan of mechanical equipment. During assembly, the sharp metal edges on both sides of the guide protrusions and limiting shoulders of the rectangular splined shaft can scratch the soft, shaft-moving lip of the oil seal, causing oil and air leaks and affecting the seal. To solve these technical problems, those skilled in the art have conducted numerous explorations, such as the convenient splined shaft protection tooling disclosed in Chinese Patent Publication No. CN222873745U. However, this assembly method lacks precise guidance and stable limiting structures, making assembly prone to wobbling and inaccuracy, reducing installation efficiency; mismatched curved surfaces between components and uneven stress can easily lead to stress concentration, impact, and wear, increasing the risk of deformation and wear, and shortening service life. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a protective device for preventing lip scratches on the oil seal of a rectangular spline assembly.

[0004] The technical solution adopted in this utility model is as follows: A protective device for preventing lip scratches on a rectangular spline assembly oil seal includes an oil seal protective sleeve and a rectangular spline shaft fitted inside the oil seal protective sleeve, wherein: The oil seal protective sleeve includes a hollow cylindrical sleeve body, with guide openings and arc-shaped keyways at both ends; the guide opening has an inwardly tapered cross-section, and the arc-shaped keyway extends axially to form an arc-shaped groove, with a smoothly transitioning guide curved surface I on the inner wall of the arc-shaped groove. A rectangular spline shaft includes a threaded shaft arranged in a columnar shape. The outer wall of the threaded shaft is provided with a guide protrusion with a rectangular cross section. A limiting shoulder is provided between the guide protrusion and the outer wall of the threaded shaft. A guide groove is formed between adjacent limiting shoulders. The guide groove is provided with a smoothly transitioning guide surface II. In addition, the arc-shaped protrusion slides along the guide protrusion into the guide groove. The guide surface II of the arc-shaped protrusion is adapted to the guide surface II of the guide groove, and the axial limit is achieved by the limiting shoulder.

[0005] This technical solution utilizes an oil seal protective sleeve in conjunction with a rectangular splined shaft. During installation, the oil seal lip transitions through the protective sleeve, avoiding the sharp metal edges on the rectangular splined shaft. This prevents oil and air leaks caused by scratches from sharp metal edges, ensuring a secure seal. Specifically, the guide cone surface of the protective sleeve facilitates quick positioning and insertion into the oil seal lip; the arc-shaped keyway engages with the guide protrusion on the rectangular splined shaft for initial guidance and positioning; the guide protrusion, positioning shoulder, and guide groove of the rectangular splined shaft form a precise assembly track; the fit between the arc-shaped protrusion and the guide groove, along with the axial positioning of the positioning shoulder, ensures stable assembly. This allows the oil seal to smoothly transition through the protective sleeve, avoiding the sharp metal edges on the rectangular splined shaft during installation. The overall structure is simple, lightweight, and highly efficient in installation.

[0006] In addition, the rectangular spline assembly oil seal anti-lip scratch protection device proposed above according to this utility model may also have the following additional technical features: According to one embodiment of the present invention, both sides of the guide protrusion and both sides of the limiting shoulder of the rectangular spline shaft are formed with sharp metal edges perpendicular to the axial direction. These sharp metal edges are prone to scratching the oil seal lip.

[0007] In this technical solution, during the installation of the oil seal, the oil seal needs to move along the shaft. When it comes into contact with a sharp metal edge perpendicular to the axial direction, the oil seal lip is easily scratched due to the sharp edge and the soft texture of the oil seal lip under the action of relative movement.

[0008] According to one embodiment of the present invention, after the rectangular spline shaft is inserted into the oil seal protective sleeve, the limiting shoulder abuts against the sleeve body between adjacent arc-shaped protrusions, the guide protrusion is close to the inner wall of the sleeve body, and the front end of the threaded shaft extends to the guide opening to form an axial positioning structure.

[0009] In this technical solution, the end face of the limiting shoulder matches the size of the main body area between adjacent arc-shaped protrusions; the side of the guide protrusion fits tightly against the inner wall of the main body, and the friction between the two during axial movement prevents the rectangular spline shaft from wobbling in the radial direction.

[0010] According to one embodiment of the present invention, the sharp metal edge is adapted to the arc-shaped protrusion, and the sharp metal edge is completely within the protection range of the oil seal protective sleeve; the oil seal lip is sleeved on the outer wall of the oil seal protective sleeve to avoid direct contact with the sharp metal edge.

[0011] This technical solution involves attaching the oil seal lip to the outer wall of the oil seal protective sleeve, thereby creating a physical barrier that blocks the direct contact path between the oil seal lip and the sharp metal edge, spatially isolating the two and ensuring that the oil seal lip is not scratched by the sharp metal edge.

[0012] According to one embodiment of the present invention, the ratio of the curvature radii of the guide surface I and the guide surface II is 1:0.8-1:1.2, forming a continuous and smooth transition mating surface.

[0013] In this technical solution, the continuous and smooth transition mating surface can reduce stress concentration, avoid impact and wear caused by surface mismatch, and ensure smooth movement between components.

[0014] According to one embodiment of the present invention, the number of the arc-shaped keyways is 4-8, and they are evenly distributed along the circumference of the main body of the sleeve; the number of the guide protrusions corresponds to the number of the arc-shaped keyways, and they are equally spaced along the circumference of the rectangular spline axis.

[0015] In this technical solution, the uniform layout ensures that the rectangular spline shaft and the sleeve body are subjected to uniform force in the circumferential direction, avoiding local stress concentration, reducing the risk of component deformation and wear, and extending service life.

[0016] Compared with the prior art, this utility model has the following advantages: (1) By constructing a physical barrier through the oil seal protective sleeve, the oil seal lip avoids the sharp metal edge on the rectangular spline shaft, thus preventing oil and air leakage caused by the sharp metal edge scratching the oil seal lip and effectively ensuring the sealing effect.

[0017] (2) The guide cone surface facilitates quick positioning and fitting into the oil seal lip; the arc keyway and guide protrusion, and the arc protrusion and guide groove are adapted to each other, and the limit shoulder is used to achieve axial limit, forming a precise assembly track, ensuring assembly stability and reducing shaking.

[0018] (3) The guide surface I and guide surface II form a continuous and smooth transition surface, reducing stress concentration, impact and wear; the arc-shaped keyway and guide protrusion are evenly distributed, so that the force is uniform, reducing the risk of component deformation and wear, and extending the overall service life. Attached Figure Description

[0019] Figure 1 This is an assembly drawing of this utility model.

[0020] Figure 2 This is a cross-sectional view of the present invention.

[0021] Figure 3 This is a cross-sectional view of the oil seal protective sleeve.

[0022] Figure 4 It is a 3D view of a rectangular spline shaft.

[0023] In the figure: 1. Oil seal protective sleeve; 11. Sleeve body; 12. Guide port; 13. Arc keyway; 2. Rectangular spline shaft; 21. Threaded shaft; 22. Guide protrusion; 23. Limiting shoulder; 24. Guide groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1 like Figures 1 to 4 As shown, this embodiment provides a protective device for preventing lip scratches on a rectangular spline assembly oil seal, including an oil seal protective sleeve 1 and a rectangular spline shaft 2 fitted inside the oil seal protective sleeve 1, wherein: The oil seal protective sleeve 1 includes a hollow cylindrical sleeve body 11, with guide openings 12 and arc-shaped keyways 13 respectively provided at both ends; the guide opening 12 has an inwardly tapered cross-section, and the arc-shaped keyway 13 extends axially to form an arc-shaped groove, with a smoothly transitioning guide surface I on the inner wall of the arc-shaped groove. The rectangular spline shaft 2 includes a columnar threaded shaft 21. The outer wall of the threaded shaft 21 is provided with a guide protrusion 22 with a rectangular cross section. A limiting shoulder 23 is provided between the guide protrusion 22 and the outer wall of the threaded shaft 21. A guide groove 24 is formed between adjacent limiting shoulders 23. The guide groove 24 is provided with a smoothly transitioning guide surface II. In addition, the arc-shaped protrusion slides along the guide protrusion 22 into the guide groove 24. The guide surface II of the arc-shaped protrusion is adapted to the guide surface II of the guide groove 24, and the axial limit is achieved by the limiting shoulder 23.

[0026] like Figures 1 to 4 As shown, this technical solution uses an oil seal protective sleeve 1 to cooperate with a rectangular splined shaft 2. During the installation of the rectangular splined oil seal, the oil seal lip transitions through the oil seal protective sleeve 1, avoiding the sharp metal edges on the rectangular splined shaft 2. This prevents oil and air leakage caused by the sharp metal edges scratching the oil seal lip, ensuring a good sealing effect. Specifically, the guide opening 12 of the oil seal protective sleeve 1 has a conical surface, which facilitates quick positioning and insertion into the oil seal lip. The arc-shaped keyway 13 cooperates with the guide protrusion 22 of the rectangular splined shaft 2 to achieve initial guidance and limiting. The guide protrusion 22, the limiting shoulder 23, and the guide groove 24 of the rectangular splined shaft 2 form a precise assembly track. The fit between the arc-shaped protrusion and the guide groove 24, and the axial limiting of the limiting shoulder 23, ensure stable assembly. This allows the oil seal to avoid the sharp metal edges on the rectangular splined shaft 2 during installation, smoothly transitioning through the oil seal protective sleeve 1. The overall structure is simple, lightweight, and has high installation efficiency.

[0027] In addition, the rectangular spline assembly oil seal anti-lip scratch protection device proposed above according to this utility model may also have the following additional technical features: According to one embodiment of the present invention, both sides of the guide protrusion 22 and both sides of the limiting shoulder 23 of the rectangular spline shaft 2 are formed with sharp metal edges perpendicular to the axial direction. These sharp metal edges are prone to scratching the oil seal lip.

[0028] In this technical solution, during the installation of the oil seal, the oil seal needs to move along the shaft. When it comes into contact with a sharp metal edge perpendicular to the axial direction, the oil seal lip is easily scratched due to the sharp edge and the soft texture of the oil seal lip under the action of relative movement.

[0029] According to one embodiment of the present invention, after the rectangular spline shaft 2 is inserted into the oil seal protective sleeve 1, the limiting shoulder 23 abuts against the sleeve body 11 between adjacent arc-shaped protrusions, the guide protrusion 22 is close to the inner wall of the sleeve body 11, and the front end of the threaded shaft 21 extends to the guide port 12 to form an axial positioning structure.

[0030] In this technical solution, the end face of the limiting shoulder 23 matches the size of the sleeve body 11 area between the adjacent arc-shaped protrusions; the side of the guide protrusion 22 is tightly fitted with the inner wall of the sleeve body 11, and the friction between the two during axial movement prevents the rectangular spline shaft 2 from wobbling in the radial direction.

[0031] According to one embodiment of the present invention, the sharp metal edge is adapted to the arc-shaped protrusion, and the sharp metal edge is completely within the protection range of the oil seal protective sleeve 1; the oil seal lip is sleeved on the outer wall of the oil seal protective sleeve 1 to avoid direct contact with the sharp metal edge.

[0032] This technical solution involves attaching the oil seal lip to the outer wall of the oil seal protective sleeve 1, thereby creating a physical barrier that blocks the direct contact path between the oil seal lip and the sharp metal edge, spatially isolating the two and ensuring that the oil seal lip is not scratched by the sharp metal edge.

[0033] According to one embodiment of the present invention, the ratio of the curvature radii of the guide surface I and the guide surface II is 1:0.8-1:1.2, forming a continuous and smooth transition mating surface.

[0034] In this technical solution, the continuous and smooth transition mating surface can reduce stress concentration, avoid impact and wear caused by surface mismatch, and ensure smooth movement between components.

[0035] According to one embodiment of the present invention, the number of the arc-shaped keyways 13 is 4-8, and they are evenly distributed around the circumference of the sleeve body 11; the number of the guide protrusions 22 corresponds to the number of the arc-shaped keyways 13, and they are equally spaced around the circumference of the rectangular spline axis 2.

[0036] In this technical solution, the uniform layout ensures that the rectangular spline shaft 2 and the sleeve body 11 are subjected to uniform force in the circumferential direction, avoiding local stress concentration, reducing the risk of component deformation and wear, and extending service life.

[0037] The usage process of the above embodiments is as follows: Figures 1 to 4 As shown, first align the oil seal lip with the guide opening 12 of the oil seal protective sleeve 1. Since the cross-section of the guide opening 12 is an inwardly tapered surface, it can be quickly positioned, allowing the oil seal lip to be smoothly inserted and moved along it. Next, insert the rectangular spline shaft 2 into the oil seal protective sleeve 1. Its guide protrusion 22 enters the arc-shaped keyway 13. The guide surface I of the arc-shaped keyway 13 cooperates with the guide protrusion 22 to achieve initial guidance and limitation. As it is inserted, the arc-shaped protrusion slides along the guide protrusion 22 to the guide groove 24. Since the curvature radius ratio of the guide surfaces I and II is appropriate, a continuous and smooth transition mating surface is formed, reducing stress and wear, allowing the arc-shaped protrusion to enter smoothly. The limiting shoulder 23 abuts against the sleeve body 11 between adjacent arc-shaped protrusions. The guide protrusion 22 is close to the inner wall of the sleeve body 11, forming axial positioning and preventing the rectangular spline shaft 2 from radially shaking. The sharp metal edge is completely within the protection range of the oil seal protective sleeve 1. The oil seal lip passes through the protective sleeve to avoid the sharp metal edge, completing a stable assembly.

[0038] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, it is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope of the claims.

Claims

1. A protective device for preventing lip scratches on a rectangular spline assembly oil seal, characterized in that, Includes an oil seal protective sleeve (1) and a rectangular splined shaft (2) fitted inside the oil seal protective sleeve (1), wherein: The oil seal protective sleeve (1) includes a hollow cylindrical sleeve body (11), with guide openings (12) and arc-shaped keyways (13) respectively provided at both ends; the guide opening (12) has an inwardly tapered cross section, and the arc-shaped keyway (13) extends axially to form an arc-shaped groove, with a smoothly transitioning guide surface I on the inner wall of the arc-shaped groove. The rectangular spline shaft (2) includes a columnar threaded shaft (21), the outer wall of which is provided with a guide protrusion (22) with a rectangular cross section; a limiting shoulder (23) is provided between the guide protrusion (22) and the outer wall of the threaded shaft (21), and a guide groove (24) is formed between adjacent limiting shoulders (23), and the guide groove (24) is provided with a smoothly transitioning guide surface II; In addition, the arc-shaped protrusion slides along the guide protrusion (22) into the guide groove (24), the guide surface II of the arc-shaped protrusion is adapted to the guide surface II of the guide groove (24), and the axial limit is achieved by the limiting shoulder (23).

2. The rectangular spline assembly oil seal anti-lip scratch protection device as described in claim 1, characterized in that, The rectangular spline shaft (2) has metal sharp edges perpendicular to the axial direction on both sides of the guide protrusion (22) and the limiting shoulder (23). These metal sharp edges can easily scratch the oil seal lip.

3. The rectangular spline assembly oil seal anti-lip scratch protection device as described in claim 1, characterized in that, After the rectangular spline shaft (2) is inserted into the oil seal protective sleeve (1), the limiting shoulder (23) abuts against the sleeve body (11) between adjacent arc-shaped protrusions, the guide protrusion (22) is close to the inner wall of the sleeve body (11), and the front end of the threaded shaft (21) extends to the guide port (12) to form an axial positioning structure.

4. The rectangular spline assembly oil seal anti-lip scratch protection device as described in claim 2, characterized in that, The sharp metal edge is adapted to the arc-shaped protrusion, and the sharp metal edge is completely within the protection range of the oil seal protective sleeve (1); the oil seal lip is sleeved on the outer wall of the oil seal protective sleeve (1) to avoid direct contact with the sharp metal edge.

5. The rectangular spline assembly oil seal anti-lip scratch protection device as described in claim 1, characterized in that, The ratio of the radii of curvature of the guide surface I and the guide surface II is 1:0.8 to 1:1.2, forming a continuous and smooth transition mating surface.

6. The rectangular spline assembly oil seal anti-lip scratch protection device as described in claim 1, characterized in that, The number of the arc-shaped keyways (13) is 4-8, and they are evenly distributed along the circumference of the main body (11); the number of the guide protrusions (22) corresponds to the number of the arc-shaped keyways (13), and they are evenly spaced along the circumference of the rectangular spline shaft (2).

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