External eccentric arc roller type clutch

Abstract

The utility model provides an external eccentric arc roller type clutch which comprises an outer ring, an inner ring and a roller, the outer ring is an eccentric arc star wheel, the inner ring is a cylindrical surface, the roller is arranged between the outer ring and the inner ring, an eccentric arc cavity is arranged on an inner hole of the outer ring, a spring groove is arranged in the eccentric arc cavity, a zigzag leaf spring is arranged in the spring groove, and the zigzag leaf spring is arranged in the inner hole of the outer ring. The width of the spring groove is slightly larger than the thickness of the zigzag leaf spring, one end of the zigzag leaf spring is inserted into the spring groove, and the other end of the zigzag leaf spring extends out of the spring groove to make contact with the roller and apply force to the roller. According to the outer eccentric arc roller type overrun clutch adopting the zigzag leaf spring, when the radial size of the clutch is limited, multiple rows of rollers can be adopted, so that the clutch has larger torque, and the zigzag leaf spring can be machined by adopting a simple tool without special spring equipment.

Description

Technical Field

[0001] The utility model relates to a mechanical transmission device, in particular to an external eccentric circular arc roller overrunning clutch with a fixed outer ring and a high-speed inner ring overrunning. Background Art

[0002] There are two types of springs for the existing eccentric circular arc roller clutch. One is a compression spring, which requires diagonal machining of spring holes on the outer ring, and the processing and assembly process is relatively complex, resulting in a higher production cost. The other is a rectangular spring, without spring holes, and the process is simple.

[0003] For example: The utility model patent with the application number 201220359246.4 discloses an external eccentric circular arc roller overrunning clutch, which is an eccentric circular arc roller clutch with a rectangular spring structure. However, this rectangular spring structure has some defects in the application of longer rollers or multi-roller parallel structures:

[0004] (1) When the length of the rectangular spring increases, the stiffness will decrease, and it is necessary to increase the wire diameter for compensation. The increase in wire diameter increases the width and free length of the rectangular spring, occupying more space, reducing the number of rollers arranged, and decreasing the torque of the clutch;

[0005] (2) In the case of multi-roller parallel arrangements such as more than two rows, the spring force application points are often on both sides, and it is basically impossible to ensure the contact between the middle roller and the inner and outer rings, resulting in poor coordination and easy damage to the clutch;

[0006] (3) If multi-row rectangular springs are used, the springs will cross and overlap during use and cannot be used normally. Content of the Utility Model

[0007] The purpose of the utility model is to provide an external eccentric circular arc roller clutch, an external eccentric circular arc roller overrunning clutch with a Z-shaped leaf spring, which can use multi-row rollers when the radial dimension of the clutch is limited, so that the clutch has a greater torque, and the Z-shaped leaf spring does not require special spring equipment and can be processed with a simple tooling.

[0008] To achieve the above purpose, the utility model is realized through the following scheme: An external eccentric circular arc roller clutch includes an outer ring, an inner ring, and rollers. The outer ring is an eccentric circular arc star wheel, the inner ring is a cylindrical surface, and rollers are provided between the outer ring and the inner ring. An eccentric circular arc cavity is provided on the inner hole of the outer ring, a spring groove is provided in the eccentric circular arc cavity, a Z-shaped leaf spring is provided in the spring groove, the width of the spring groove is slightly wider than the thickness of the Z-shaped leaf spring and less than twice the thickness of the Z-shaped leaf spring. One end of the Z-shaped leaf spring is inserted into the spring groove, and the other end extends out of the spring groove to contact the roller and apply force to the roller; Retaining rings and circlips for holes are also provided on both sides of the roller.

[0009] A further improvement lies in that the U-shaped leaf spring is formed by repeatedly bending an elastic sheet material back and forth.

[0010] A further improvement lies in that the U-shaped leaf spring and the rollers are arranged side by side in a single row or multiple rows.

[0011] The utility model uses a U-shaped leaf spring to replace a rectangular spring, and a spring groove is provided in the eccentric arc-shaped cavity of the outer ring. The width of the spring groove is slightly wider than the thickness of the U-shaped leaf spring. One end of the U-shaped leaf spring is inserted into the spring groove to ensure that the force application angle of the U-shaped leaf spring is stable and there is no axial movement when multiple rows are installed. The inner ring is a cylindrical surface, and the U-shaped leaf spring applies an initial force to the rollers. The U-shaped leaf spring and the rollers are evenly stressed, which can ensure the uniform stress of multiple rows of rollers. The retaining ring and the hole-type snap ring limit the clutch axially. When the radial dimension of the clutch is limited, multiple rows of rollers can be used, enabling the clutch to have a greater torque, and the U-shaped leaf spring does not require special spring equipment and can be processed using a simple tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural view of the utility model;

[0013] Figure 2 is a left view of the utility model;

[0014] Figure 3 is of the utility model Figure 2 partial cross-sectional view at A;

[0015] Figure 4 is a schematic view of the multi-row side-by-side arrangement of the U-shaped leaf spring and the rollers of the utility model;

[0016] Reference numerals: 1 - outer ring, 2 - inner ring, 3 - roller, 4 - U-shaped leaf spring, 5 - hole-type snap ring, 6 - retaining ring, 7 - spring groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] As Figures 1 to 4 shown, a kind of outer eccentric arc roller clutch of the utility model includes an outer ring 1, an inner ring 2, and rollers 3. The outer ring 1 is an eccentric arc star wheel, the inner ring 2 is a cylindrical surface, and rollers 3 are arranged between the outer ring 1 and the inner ring 2. An eccentric arc-shaped cavity is provided in the inner hole of the outer ring 1, and a spring groove 7 is provided in the eccentric arc-shaped cavity. A U-shaped leaf spring 4 is provided in the spring groove 7. The width of the spring groove 7 is slightly wider than the thickness of the U-shaped leaf spring 4. One end of the U-shaped leaf spring 4 is inserted into the spring groove 7, and the other end extends out of the spring groove 7 to contact the roller 3 and apply force to the roller 3; A retaining ring 6 and a hole-type snap ring 5 are also provided on both sides of the roller 3.

[0018] Among them, the U-shaped leaf spring 4 is formed by repeatedly bending an elastic sheet material back and forth, and is arranged side by side in a single row or multiple rows, and the rollers 3 are arranged side by side in a single row or multiple rows.

[0019] Specifically: an eccentric arc cavity is machined on the inner hole of the outer ring 1, a spring groove 7 is provided on one side of the cavity, the width b of the spring groove 7 is slightly wider than the thickness t of the zigzag leaf spring 4 and less than 2t. One end of the zigzag leaf spring 4 is inserted into the spring groove. The zigzag leaf spring applies force in a stable direction in the spring groove and will not overlap axially. Multiple rows can be arranged side by side, and the corresponding rollers 3 can be arranged in a single row or multiple rows. The zigzag leaf spring 4 applies force to the rollers 3. The rollers 3 are in close contact with the outer circle of the inner ring 2 and the eccentric arc surface of the outer ring 1 to realize the working process of overrunning release. The retaining ring 6 and the hole retaining snap ring 5 axially limit the rollers 3 and the zigzag leaf spring 4.

[0020] In the utility model, the rectangular spring is changed to a zigzag leaf spring 4. A spring groove 7 is provided on one side of the eccentric arc cavity of the outer ring 1 to fix the zigzag leaf spring 4. The length of the clutch roller can be longer than that of the rectangular spring, and multiple rows of rollers can also be used. The clutch has a greater torque, and the zigzag leaf spring 4 does not require special spring equipment and can be processed with a simple tooling, which is very flexible and convenient.

Claims

1. An external eccentric circular arc roller clutch, comprising an outer ring (1), an inner ring (2), and rollers (3). The outer ring (1) is an eccentric circular arc star wheel, the inner ring (2) is a cylindrical surface, and rollers (3) are provided between the outer ring (1) and the inner ring (2), characterized in that An eccentric arc cavity is provided on the inner hole of the outer ring (1). A spring groove (7) is provided in the eccentric arc cavity. A zigzag leaf spring (4) is arranged in the spring groove (7). The width of the spring groove (7) is slightly wider than the thickness of the zigzag leaf spring (4) and less than twice the thickness of the zigzag leaf spring (4). One end of the zigzag leaf spring (4) is inserted into the spring groove (7), and the other end extends out of the spring groove (7) to contact the roller (3) and apply force to the roller (3). A retaining ring (6) and a hole snap ring (5) are also arranged on both sides of the roller (3).

2. The external eccentric circular arc roller clutch according to claim 1, wherein, The zigzag leaf spring (4) is formed by repeatedly bending an elastic sheet material.

3. The external eccentric circular arc roller clutch according to claim 1, characterized in that, The zigzag leaf spring (4) is arranged in a single row or multiple rows side by side.

4. The external eccentric circular arc roller clutch according to claim 1, wherein The roller (3) is arranged in a single row or multiple rows side by side.

Images