Unidirectional deflection deformation spherical hinge

Abstract

A one-way deflection deformation spherical hinge comprises a metal core shaft on the innermost layer, a metal outer sleeve on the outermost layer and a rubber body connecting the core shaft and the outer sleeve into a whole, flat squares used for assembling are arranged at the two ends of the core shaft, and limiting mechanisms connected to the outer sleeve are arranged on the two sides of the two flat squares. The connecting line between the two limiting mechanisms on the two sides of the same flat square is perpendicular to the axis of the assembling hole in the flat square. The limiting mechanisms are arranged on the two sides of the flat square part of the mandrel, when the mandrel moves, the flat square part is prevented from moving in certain directions through the limiting mechanisms, and then the mandrel is prevented from deflecting. Meanwhile, the limiting mechanism is connected to the outer sleeve, so that the limiting mechanism and the outer sleeve are relatively limited, displacement of the mandrel and the outer sleeve in the direction is avoided, and the one-way deflection deformation characteristic is achieved.

Description

Technical Field

[0001] This utility model relates to a ball joint, specifically a ball joint with unidirectional deflection deformation characteristics. Background Technology

[0002] Ball joints, as a widely used connection structure, typically consist of an innermost metal core, a middle rubber layer, and an outermost metal sleeve. They generally possess six degrees of freedom of deformation, making them extensively used in flexible connections and vibration damping components of various mechanical devices. However, in certain linkage mechanisms, it is necessary to allow for large deformation in some directions while restricting deformation in others to achieve specific control functions. Current ball joint structures usually prioritize durability to improve lifespan, neglecting the unidirectional deflection characteristic, thus failing to meet usage requirements. Utility Model Content

[0003] This invention addresses the limitation of current ball joints in achieving specific control functions through their structure. It proposes a unidirectional deflection deformable ball joint that prevents deflection in a certain direction, thereby meeting specific usage requirements.

[0004] The technical means adopted by this utility model to solve the above problems is as follows: a unidirectional deflection deformable ball joint, including an innermost metal mandrel, an outermost metal sleeve, and a rubber body connecting the mandrel and sleeve into a whole. The mandrel has flat sections at both ends for assembly. Each of the two flat sections has a limiting mechanism connected to the sleeve on both sides. The line connecting the two limiting mechanisms on both sides of the same flat section is perpendicular to the axis of the assembly hole on the flat section. The limiting mechanisms avoid the ends of the assembly hole to prevent interference during assembly.

[0005] Furthermore, there is a gap between the limiting mechanism and the flat shaft. The limiting mechanism does not interfere with the displacement of the mandrel in the other direction.

[0006] Furthermore, the gap should be less than or equal to 1mm. This is to avoid excessive gap causing excessive displacement of the mandrel in this direction.

[0007] Furthermore, the surface of the flat object near the limiting mechanism is flat, and correspondingly, the surface of the limiting mechanism near the flat object is also flat. This simplifies manufacturing and makes it easier to control the spacing.

[0008] Furthermore, the limiting mechanism includes a wear-resistant limiting block near the flat side and a fixing block away from the flat side. A rubber layer connects the wear-resistant limiting block and the fixing block, and the fixing block is connected to the outer sleeve. This prevents relative displacement between the fixing block and the outer sleeve.

[0009] Furthermore, the middle part of the mandrel is a cylindrical or spherical structure, with two flat squares located at the two ends of the cylindrical or spherical structure, a rubber body located between the outer sleeve and the cylindrical or spherical structure, and a rubber layer located between the flat squares and the fixing block.

[0010] Furthermore, both the fixing block and the rubber layer are arc-shaped, the surface of the wear-resistant limiting block in contact with the rubber layer is also arc-shaped, and the surface of the wear-resistant limiting block away from the rubber layer is flat.

[0011] Furthermore, the widths of the fixing block, the rubber layer, and the wear-resistant limiting block are all equal along the axial direction of the assembly hole.

[0012] Furthermore, the width of the limiting mechanism along the axial direction of the assembly hole is greater than the height of the flat bar along the axial direction of its assembly hole.

[0013] Furthermore, in the free state, both ends of the limiting mechanism extend beyond the two ends of the flat square along the axial direction of its mounting hole.

[0014] The beneficial effects of this utility model are:

[0015] 1. This utility model provides limiting mechanisms on both sides of the mandrel flat side. When the mandrel is displaced, the limiting mechanisms prevent displacement in certain directions, thereby preventing the mandrel from deflecting. Simultaneously, by connecting the limiting mechanisms to the outer sleeve, relative limiting between the limiting mechanisms and the outer sleeve is achieved, thus preventing displacement of the mandrel and outer sleeve in this direction and realizing unidirectional deflection deformation characteristics.

[0016] 2. This utility model, by setting a gap between the limiting mechanism and the flat square, allows the mandrel to still be able to move relative to the outer sleeve along the limiting plane direction, thus ensuring the deformation capability of the ball joint in this direction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0018] Figure 2 for Figure 1 Side view diagram;

[0019] Figure 3 for Figure 2 Enlarged view of a portion;

[0020] Figure 4 This is a schematic diagram of the mandrel structure in Example 1;

[0021] In the diagram: 1. Outer shell, 2. Rubber body, 3. Mandrel, 31. Cylindrical structure, 32. Flat square, 33. Assembly hole, 4. Limiting mechanism, 41. Fixing block, 42. Rubber layer, 43. Wear-resistant limiting block. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings. The drawings are for illustrative purposes only, representing schematic diagrams only, not actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Example 1

[0023] A type of unidirectional deflection deformable ball joint, such as Figure 1 and Figure 2 As shown, it includes an outer sleeve 1, a rubber body 2, a spindle 3, and a limiting mechanism 4. The spindle 3 is located in the innermost layer of the ball joint, the outer sleeve 1 is located in the outermost layer of the ball joint, the rubber body 2 is located between the spindle 3 and the outer sleeve 1, and there are four limiting mechanisms 4 in total, which are symmetrically arranged at both ends of the axial direction of the outer sleeve 1 and on both sides of the flat square of the spindle 3.

[0024] like Figure 4 As shown, the middle part of the mandrel 3 is a cylindrical structure 31 (it could also be a spherical structure, etc.). Each end of the cylindrical structure 31 has a flat square 32, and each flat square 32 has a mounting hole 33 in the middle for mounting a ball joint. In this embodiment, as... Figure 2 As shown, viewed from the end, the flat rectangle 32 is square, with chamfered corners at all four corners to avoid sharp edges. Figure 1 As shown, the line connecting the two limiting mechanisms 4 at the same flat surface 32 is perpendicular to the axis of the mounting hole 33 on the flat surface 32, so that the limiting mechanism 4 will not affect the assembly of the ball joint.

[0025] like Figure 2 and Figure 3 As shown, the limiting mechanism 4 includes an outermost fixing block 41, an innermost wear-resistant limiting block 43, and a rubber layer 42 between the fixing block 41 and the wear-resistant limiting block 43. The fixing block 41 and the wear-resistant limiting block 43 are connected as a whole by the rubber layer 42. Overall, the rubber body 2 adheres the cylindrical outer sleeve 1 to the outside of the cylindrical structure 31 of the mandrel 3, and the fixing block 41 is connected to the outer sleeve 1 to ensure the fixation of the relative position between the fixing block 41 and the outer sleeve 1. In this embodiment, the fixing block 41 is arc-shaped (of course, it can also be other shapes, such as square, etc.) to facilitate processing, reduce production costs, and improve efficiency. The rubber layer 42 is also designed to be a relatively thin arc shape (determined according to the shape of the fixing block), and the thickness of the rubber layer 42 should not be too large, only enough to achieve the connection effect. This is because when the rubber layer 42 is too thick, it will be compressed under load, resulting in a large relative displacement between the wear-resistant limiting block 43 and the fixing block 41, which will not achieve a good limiting effect. The surface of the wear-resistant limiting block 43 near the rubber layer 42 is also arc-shaped, while its surface near the flat square 32 is flat, such as... Figure 3 As shown, there is a small gap between the flat square 32 and the wear-resistant limiting block 43, such as designing the gap dimension D to be 1mm. When the ball joint is under load and the spindle 3 deforms relative to the outer sleeve 1 along the axial direction of the mounting hole 33, a friction pair is formed between the side of the flat square 32 and the surface of its corresponding wear-resistant limiting block 43. The existence of the gap can ensure the deformation capability of the ball joint in the axial direction of its mounting hole 33.

[0026] In this embodiment, the outer diameter of the fixing block 41 is slightly smaller than the outer diameter of the outer sleeve 1, while the inner diameter of the fixing block 41 is equal to the inner diameter of the outer sleeve 1. Therefore, when the outer sleeve 1 and the mandrel 3 are vulcanized into a whole, the fixing block 41 and the wear-resistant limiting block 43 can be vulcanized and bonded simultaneously. Furthermore, the design that the fixing block 41 and the outer sleeve 1 have the same inner diameter allows for the use of a simpler vulcanization mold. Of course, the fixing block 41 can also be designed to have the same inner and outer diameters as the outer sleeve 1, which further simplifies the vulcanization mold structure.

[0027] like Figure 1 and Figure 2 As shown, the widths of the fixing block 41, rubber layer 42, and wear-resistant limiting block 43 along the axial direction of the mounting hole 33 are all equal, which simplifies processing. Furthermore, in the free state, the width of the limiting mechanism 4, composed of the fixing block 41, rubber layer 42, and wear-resistant limiting block 43, in this direction is greater than the height of the flat square 32 along the axial direction of its mounting hole 33. Simultaneously, both ends of the limiting mechanism 4 extend beyond the ends of the flat square 32 in this width direction. Thus, when the mandrel 3 undergoes a certain displacement along the axial direction of the mounting hole 33, the flat square 32 still has a large area or its entire surface in contact with the limiting mechanism 4, ensuring the limiting effect. In use, when the ball joint is loaded, the rubber body 2 undergoes elastic deformation, causing the mandrel 3 and the outer sleeve 1 to deflect relative to each other. However, due to the limitations of the friction pair, the deflection can only occur along the friction pair plane, not perpendicular to it, thus achieving the unidirectional deflection deformation characteristic of the ball joint.

[0028] The above embodiments are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the protection scope of the present invention, which should be defined by the claims.

Claims

1. A unidirectional deflection deformable ball joint, comprising an innermost metal mandrel, an outermost metal sleeve, and a rubber body connecting the mandrel and sleeve into a whole, wherein the mandrel has flat squares at both ends for assembly, characterized in that: Both sides of the two flat sections are provided with limiting mechanisms connected to the outer sleeve, and the line connecting the two limiting mechanisms on both sides of the same flat section is perpendicular to the axis of the mounting hole on the flat section.

2. The unidirectional deflection deformable ball joint as described in claim 1, characterized in that: There is a gap between the limiting mechanism and the flat square.

3. The unidirectional deflection deformable ball joint as described in claim 2, characterized in that: The gap is less than or equal to 1 mm.

4. The unidirectional deflection deformable ball joint as described in claim 1, characterized in that: The surface of the flat object near the limiting mechanism is flat, and correspondingly, the surface of the limiting mechanism near the flat object is also flat.

5. The unidirectional deflection deformable ball joint as described in claim 1, characterized in that: The limiting mechanism includes a wear-resistant limiting block near the flat side and a fixing block away from the flat side. There is a rubber layer connecting the wear-resistant limiting block and the fixing block, and the fixing block is connected to the outer sleeve.

6. The unidirectional deflection deformable ball joint as described in claim 5, characterized in that: The middle part of the mandrel is a cylindrical or spherical structure, with two flat squares located at the two ends of the cylindrical or spherical structure, a rubber body located between the outer sleeve and the cylindrical or spherical structure, and a rubber layer located between the flat squares and the fixing block.

7. The unidirectional deflection deformable ball joint as described in claim 5, characterized in that: Both the fixing block and the rubber layer are arc-shaped, the surface of the wear-resistant limiting block in contact with the rubber layer is also arc-shaped, and the surface of the wear-resistant limiting block away from the rubber layer is flat.

8. The unidirectional deflection deformable ball joint as described in claim 5, characterized in that: The widths of the fixing block, rubber layer, and wear-resistant limiting block are all equal along the axial direction of the assembly hole.

9. The unidirectional deflection deformable ball joint as described in claim 2, characterized in that: The width of the limiting mechanism along the axial direction of the assembly hole is greater than the height of the flat bar along the axial direction of its assembly hole.

10. The unidirectional deflection deformable ball joint as described in claim 9, characterized in that: In the free state, both ends of the limiting mechanism extend beyond the two ends of the flat square along the axial direction of its mounting hole.

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