Fixing structure of a housing for constant velocity joint
By combining the first and second clamping components, the problem of insufficient sealing of the protective cover for the constant velocity joint is solved, the pressing force at the edge is enhanced, grease leakage is prevented, and the fixing strength is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TOYOTA JIDOSHA KK
- Filing Date
- 2025-07-22
- Publication Date
- 2026-07-21
AI Technical Summary
In the existing technology, the sealing performance of the protective cover for constant velocity joint is insufficient, especially at the edges where leakage is easy, and the tightening force is difficult to balance clamping strength and sealing performance.
The fixture design employs a combination of a first clamping member and a second clamping member. When the diameter of the first clamping member is reduced, it generates radial pressing force. The two ends of the second clamping member slide circumferentially, forming an angle of less than 45 degrees and covering the entire irregular concave part, thereby enhancing the pressing force on the edge.
The sealing performance of the protective cover for the constant velocity joint is improved, preventing grease leakage, enhancing the fixing strength, and achieving improved sealing performance.
Smart Images
Figure CN224533292U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a fixing structure for a protective cover for a constant velocity connector, and more specifically, to a fixing structure for a protective cover for a constant velocity connector that uses a clamp to fix the protective cover to an irregularly shaped constant velocity connector housing with a concave surface on its outer periphery. Background Technology
[0002] Previously, there were known constant velocity joint covers that were fixed to a non-circular constant velocity joint housing (hereinafter referred to as the joint housing) with a concave surface on the outer periphery by means of a clamp (see, for example, Patent Document 1).
[0003] Patent Document 1 describes a protective cover having a thick-walled portion corresponding to the aforementioned concave portion and a thin-walled portion corresponding to the outer convex portion. The thick-walled portion has an inner circumferential thick-walled portion and an outer circumferential thick-walled portion. The inner circumferential thick-walled portion is formed corresponding to the concave portion of the connector housing. The outer circumferential thick-walled portion protrudes outward compared to the outer circumferential extension line of the thin-walled portion, and the outer circumferential surface of the outer circumferential thick-walled portion has a flat portion orthogonal to the radial center line and chamfered portions formed on both sides thereof.
[0004] In Patent Document 1, the clamp is circular, while the connector housing is irregularly shaped. Therefore, the clamp is tightened and the protective cover is fixed in a state where the shape of the cover matches the shape of the clamp and the shape of the connector housing.
[0005] Existing technical documents
[0006] Patent documents
[0007] Patent Document 1: Japanese Patent Application Publication No. 2010-139051
[0008] However, in the structure described in Patent Document 1, the rigidity of the protective cover for the irregular part is low, and during clamping, the force only acts radially, thus weakening the force pressing against the edge of the concave part. Consequently, the sealing of the edge becomes insufficient, raising concerns about grease leakage from the joint. Therefore, it is difficult to obtain the force needed to press against the edge, requiring a larger clamping force. However, to balance clamping strength and sealing, narrow-range management of the clamping force is necessary in the factory. Utility Model Content
[0009] The problem to be solved by utility models
[0010] This invention was made in view of the above situation, and its objective is to provide a fixing structure for a constant velocity joint cover that can improve the sealing performance of the edge portion, which is a weak point of sealing, for a cover with an irregularly shaped recess on the outer periphery.
[0011] Methods for solving problems
[0012] To address the aforementioned issues, this utility model provides a fixing structure for a protective cover of an constant velocity connector. This fixing structure secures a shaped constant velocity connector housing with a concave outer surface to a protective cover mounted on the housing via a clamp. The protective cover has a shaped recess corresponding to the concave outer surface. The clamp comprises: a first, strip-shaped clamping member that surrounds the outer peripheral surface of the protective cover and is capable of diameter reduction; and a second clamping member disposed between the first clamping member and the shaped recess, with both ends capable of circumferential sliding relative to the first clamping member. The angle between a line orthogonal to the tangent of the edge of the shaped recess and a line orthogonal to the tangent of the portion of the second clamping member that contacts the edge is set to 45 degrees or less, and the perimeter of the second clamping member is greater than or equal to the perimeter of the clamp contact surface of the shaped recess.
[0013] With this configuration, when the first clamping member is reduced in diameter and the cover is fastened, the first clamping member generates a force that presses only in the radial direction. As the first clamping member is reduced in diameter, the two ends of the second clamping member slide in a direction that approaches each other, generating a force that presses not only the edge portion but also the entire irregular recess.
[0014] Effects of the utility model
[0015] According to this utility model, by constructing it as described above, the sealing performance of the edge portion, which is a weak point in sealing, can be improved for the cover of the constant velocity joint with irregularly shaped recesses on the outer periphery. Attached Figure Description
[0016] Figure 1 (a) is an explanatory diagram showing the fixing structure of the constant velocity joint cover of the present invention, and (b) is an enlarged sectional view of part I of (a).
[0017] Figure 2 The diagram shows the first clamping member and the second clamping member of the present invention. (a) is a schematic cross-sectional view of the contact portion of the second clamping member that contacts the edge portion, and (b) is a schematic cross-sectional view of the sliding portion of the first clamping member and the second clamping member.
[0018] Figure 3 This is a schematic cross-sectional view showing the state in which the first clamping member of the present invention is fastened and the protective cover is fixed.
[0019] Figure 4 This is a schematic cross-sectional view showing another embodiment of the fixing structure of the shield for the constant velocity joint of this utility model.
[0020] Explanation of reference numerals in the attached figures
[0021] 1: Connector housing (constant velocity connector housing); 2: Concave surface; 4: Protective cover; 5: Irregularly shaped recess; 6: Edge; 10: Clamp; 11: First clamping member; 12: Second clamping member; 13: Third clamping member. Detailed Implementation
[0022] The following is a detailed description of the form used to implement this utility model, based on the accompanying drawings.
[0023] like Figure 1 As shown, the constant velocity joint housing 1 (hereinafter referred to as joint housing 1) is formed as an irregular shape with concave portions 2 in three parts of the outer circumference. In this joint housing 1, a three-ball pin assembly (not shown) in which multiple needle rollers are assembled between three trunnions (Japanese: トリポート) and the spherical rollers is housed in three pairs of axially parallel roller grooves 3 on the inner side of the joint housing 1.
[0024] A corrugated rubber cover 4 is fitted around the outer periphery of the connector housing 1 and is secured by a clamp 10. The cover 4 has an irregularly shaped recess 5 that corresponds to the concave portion 2 of the connector housing 1.
[0025] like Figure 1 and Figure 2 As shown, the clamp 10 includes a strip-shaped first clamping member 11 that surrounds the outer peripheral surface of the cover 4 and is capable of being reduced in diameter, and a second clamping member 12 disposed between the first clamping member 11 and the irregular recess 5 and whose two ends are capable of sliding circumferentially relative to the first clamping member 11. Furthermore, the first clamping member 11 is fastened in the reduced-diameter state by the operation of a rod (not shown) mounted on the first clamping member 11.
[0026] In this case, such as Figure 2 As shown, the angle θ formed by the line L1, which is orthogonal to the tangent T1 of the edge portion 6 of the irregular recess 5, and the line L2, which is orthogonal to the tangent T2 of the portion of the second clamping member 12 that contacts the edge portion 6, is set to 45 degrees or less, and the perimeter of the second clamping member 12 is formed to be greater than or equal to the perimeter of the clamping contact surface of the irregular recess 5.
[0027] As described above, the reason for setting the angle θ to 45 degrees or less is that if it exceeds 45 degrees, the second clamping member 12 will deform in the flattening direction and will not be able to tighten. In addition, by forming the circumference of the second clamping member 12 to be greater than or equal to the circumference of the clamping contact surface of the irregular recess 5, the second clamping member 12 generates a force that not only presses the edge portion 6 but also the entire irregular recess 5.
[0028] Regarding the steps of fixing the cover 4 to the connector housing 1, firstly, it is matched to the shape of the connector housing 1, and the irregular recess 5 of the cover 4 is matched with the concave portion 2. After the cover 4 is externally mounted to the connector housing 1, a second clamping member 12 is placed between the first clamping member 11 and the irregular recess 5, surrounding the outer periphery of the cover 4 with the first clamping member 11. In this state, when the first clamping member 11 is reduced in diameter to fasten the cover 4, the first clamping member 11 generates a force that presses only radially. Accompanying the reduction in diameter of the first clamping member 11, the two ends of the second clamping member 12 slide in a direction of mutual approach, generating a force that presses not only the edge portion 6 but also the entire irregular recess (see reference). Figure 3 ).
[0029] Figure 4 This is a schematic cross-sectional view showing another embodiment of the fixing structure of the constant velocity joint cover of the present invention. In this other embodiment, a pair of circular or elliptical third clamping members 13 are provided between the first clamping member 11 and the second clamping member 12. The pair of circular or elliptical third clamping members 13 are in contact with each other and have a rebound force in contact with the first clamping member 11 and the second clamping member 12.
[0030] With this configuration, when the first clamping member 11 is reduced in diameter and the cover 4 is tightened, the two ends of the second clamping member 12 slide in a direction approaching each other as the diameter of the first clamping member 11 decreases. At the same time, the third clamping member 13 is pressed against each other, and the third clamping member 13 is pressed against the first clamping member 11 and the second clamping member 12. Thus, the force of the second clamping member 12 pressing not only the edge portion 6 but also the entire irregular recess 5 becomes strong, making the fixation of the cover 4 more secure.
[0031] According to the fixing structure of the constant velocity connector cover according to the above embodiment, when the first clamping member 11 is reduced in diameter to fasten the cover 4, the first clamping member 11 generates a force that presses only radially. As the diameter of the first clamping member 11 decreases, the two ends of the second clamping member 12 slide in a direction approaching each other, generating a force that presses not only the edge portion 6 but also the entire irregularly shaped recess. Therefore, for the cover 4 with the irregularly shaped recess 5 on its outer periphery, the sealing performance of the edge portion 6, which is a weak point in sealing, can be improved, and leakage of grease inside the connector housing 1 can be prevented.
Claims
1. A fixing structure for a protective cover of an constant velocity joint, wherein the fixing structure secures an irregularly shaped constant velocity joint housing with a concave outer surface to a protective cover mounted on the constant velocity joint housing by means of a clamp, characterized in that, The protective cover has an irregularly shaped recess corresponding to the concave surface. The clamp includes: a strip-shaped first clamping member that surrounds the outer peripheral surface of the cover and is capable of being tapered; and a second clamping member disposed between the first clamping member and the irregular recess, and whose two ends are capable of sliding circumferentially relative to the first clamping member. The angle between the line orthogonal to the tangent of the edge portion of the irregular recess and the line orthogonal to the tangent of the portion of the second clamping member that contacts the edge portion is set to 45 degrees or less, and the perimeter of the second clamping member is formed to be greater than or equal to the perimeter of the clamping contact surface of the irregular recess.