A dual torsion spring

Abstract

A double torsion spring, comprising a torsion spring body, the torsion spring body comprising an inner torsion spring and an outer torsion spring connected with each other, the outer side of the torsion spring body is respectively provided with a first foot group and a second foot group, the first foot group comprises two first feet with the same stress direction, the second foot group comprises two second feet with the same stress direction, one of the first foot and the second foot is arranged on the inner torsion spring, and the other first foot and second foot are arranged on the outer torsion spring. The double torsion spring of the utility model is provided with the first foot group and the second foot group which are respectively arranged on the outer side of the torsion spring body, the first foot group comprises two first feet with the same stress direction, the second foot group comprises two second feet with the same stress direction, the design of the double feet can greatly improve the structural strength, the feet will not be damaged under long-term stress, the service life of the torsion spring is greatly improved, and the product is more suitable for higher elastic requirements.

Description

Technical Field

[0001] This utility model relates to the field of torsion spring technology, and in particular to a double torsion spring. Background Technology

[0002] Chinese patent document CN215496427U, published on January 11, 2022, discloses a multi-layer bidirectional double torsion spring, comprising an outer torsion spring and an inner torsion spring arranged concentrically. The lower ends of the outer and inner torsion springs are connected by a continuous connecting section. The upper end of the outer torsion spring extends with a first elastic wall arranged at an angle, and the upper end of the inner torsion spring extends with a second elastic wall arranged at an angle. The outer torsion spring consists of at least three helically continuous outer side walls, and the inner torsion spring consists of at least four helically continuous inner side walls, with gaps between the outer and inner side walls. This multi-layer bidirectional double torsion spring bears force through the first and second elastic walls (i.e., support legs), but the structural strength of the first and second elastic walls is generally weak, making them prone to damage under long-term stress and resulting in a short service life.

[0003] Therefore, further improvements are necessary. Utility Model Content

[0004] The purpose of this invention is to provide a double torsion spring that is simple in structure, high in strength, long in service life, highly elastic, and practical, so as to overcome the shortcomings of the prior art.

[0005] A double torsion spring designed for this purpose includes a torsion spring body, which includes an inner torsion spring and an outer torsion spring connected to each other. The torsion spring body is characterized by having a first leg group and a second leg group extending from its outer side. The first leg group includes two first legs with the same force direction, and the second leg group includes two second legs with the same force direction. One of the first legs and the second leg are disposed on the inner torsion spring, and the other first leg and the second leg are disposed on the outer torsion spring.

[0006] The inner torsion spring has several layers of first connecting segments wound around it, and the outer torsion spring has several layers of second connecting segments wound around it. The first connecting segments and the second connecting segments are wound in opposite directions.

[0007] The first connecting segment is wound with its starting end connected to the first foot, the first connecting segment is wound with its ending end connected to the second foot, the second connecting segment is wound with its starting end connected to the second foot, and the second connecting segment is wound with its starting end connected to the first foot.

[0008] A connecting part is provided between the two second legs, and the two second legs are connected through the connecting part to connect the inner torsion spring and the outer torsion spring.

[0009] The angle between the first leg group and the second leg group is c, where c = 110° to 150°.

[0010] An external torsion spring is positioned between the two first legs and between the two second legs.

[0011] The cross-sectional shape of the torsion spring body is rectangular.

[0012] The first and second connecting segments are arranged in a flat configuration.

[0013] The two first legs are arranged parallel to each other and have a first gap between them; the two second legs are arranged parallel to each other and have a second gap between them.

[0014] The portions of the inner and outer torsion springs located between the first and second support groups fit together, while the portions of the inner and outer torsion springs located outside the first and second support groups have gaps between them.

[0015] The double torsion spring of this invention extends a first leg group and a second leg group to the outer side of the torsion spring body, respectively. The first leg group includes two first legs with the same force direction, and the second leg group includes two second legs with the same force direction. The double leg design can greatly improve its structural strength, so that the legs will not be damaged even under long-term force, greatly improving the service life of the torsion spring, and is more suitable for products with high elasticity requirements. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the double torsion spring in one embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the overall structure of the double torsion spring from another position in one embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the overall structure of the third position of the double torsion spring in one embodiment of the present invention.

[0019] Figure 4 This is a front view of a double torsion spring in one embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the overall structure of the double torsion spring in the fourth position in one embodiment of the present invention. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] See Figures 1-5This double torsion spring includes a torsion spring body 1, which includes an inner torsion spring 2 and an outer torsion spring 3 connected to each other. A first leg group a and a second leg group b are respectively extended from the outer side of the torsion spring body 1. The first leg group a includes two first legs 4 with the same force direction, and the second leg group b includes two second legs 5 with the same force direction. The force directions of the first legs 4 and the second legs 5 are opposite. One of the first legs 4 and the second legs 5 are set on the inner torsion spring 2, and the other first legs 4 and the second legs 5 are set on the outer torsion spring 3.

[0023] The inner torsion spring 2 has several layers of first connecting segments 6 wound around it, and the outer torsion spring 3 has several layers of second connecting segments 7 wound around it. The first connecting segments 6 and the second connecting segments 7 are wound in opposite directions. The first connecting segments 6 are wound in a counterclockwise direction, and the second connecting segments 7 are wound in a clockwise direction. This can counteract the radial force generated by the bidirectional torque, improve stability, and prevent overall deflection. In this embodiment, the first connecting segments 6 are wound in 4 layers, and the second connecting segments 7 are wound in 3 layers.

[0024] The first connecting segment 6 is wound from the beginning to the first leg 4, and from the end to the second leg 5. The second connecting segment 7 is wound from the beginning to the second leg 5, and from the beginning to the first leg 4, forming a cross force transmission path and optimizing torque distribution. The first leg 4 of the inner torsion spring 2 is wound counterclockwise, and after 4 layers, it extends outward to form the second leg 5 of the inner torsion spring 2. Then, the second leg 5 of the inner torsion spring 2 bends inward, and the bent part forms the second leg 5 of the outer torsion spring 3. After that, the second leg 5 of the outer torsion spring 3 is wound clockwise, and after 3 layers, it extends outward to form the first leg 4 of the outer torsion spring 3. At this point, the entire torsion spring winding is completed.

[0025] A connecting part 8 is provided between the two second legs 5. The two second legs 5 are connected through the connecting part 8 to connect the inner torsion spring 2 and the outer torsion spring 3. The two second legs 5 and the connecting part 8 are integrally set, thereby making the inner torsion spring 2 and the outer torsion spring 3 integrally set. The two second legs 5 and the connecting part 8 together form a U-shape.

[0026] The angle between the first leg group a and the second leg group b is c, where c = 110° to 150°, preferably 130°. The obtuse angle design allows the two legs to generate asymmetrical torque components when subjected to force. The torque outputs of the inner torsion spring 2 and the outer torsion spring 3 complement each other, avoiding local overload caused by the superposition of forces in the same direction.

[0027] The external torsion spring 3 is disposed between the two first legs 4 and between the two second legs 5.

[0028] The cross-sectional shape of the torsion spring body 1 is rectangular. Traditional torsion springs generally have a circular cross-section. Compared with a circular cross-section, a rectangular cross-section has a higher moment of inertia in a specific direction, which can improve the torsion spring's resistance to deformation.

[0029] The first connecting section 6 and the second connecting section 7 are flat, which increases the contact area, improves the connection stability between the support and the connecting section, and reduces stress concentration.

[0030] The two first legs 4 are arranged parallel to each other and there is a first gap 9 between the two first legs 4; the two second legs 5 are arranged parallel to each other and there is a second gap 10 between the two second legs 5; the external torsion spring 3 is arranged on the first gap 9 and the second gap 10.

[0031] The inner torsion spring 2 and the outer torsion spring 3 are in contact with each other between the first support group a and the second support group b. There is a gap 11 between the inner torsion spring 2 and the outer torsion spring 3 outside the first support group a and the second support group b. The gap 11 allows the inner torsion spring 2 and the outer torsion spring 3 to have sufficient deformation space.

[0032] The inner torsion spring 2 has a first foot 4 on one side and a second foot 5 on the other side. The outer torsion spring 3 has a second foot 5 on one side and a first foot 4 on the other side.

[0033] The above describes the preferred embodiments of this utility model, illustrating and describing its basic principles, main features, and advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made without departing from the spirit and scope of this utility model, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dual torsion spring comprising a torsion spring body (1) comprising an inner torsion spring (2) and an outer torsion spring (3) connected to each other, characterized in that: The outer side of the torsion spring body (1) is provided with a first leg group (a) and a second leg group (b). The first leg group (a) includes two first legs (4) with the same force direction, and the second leg group (b) includes two second legs (5) with the same force direction. One of the first legs (4) and the second leg (5) is provided on the inner torsion spring (2), and the other first leg (4) and the second leg (5) are provided on the outer torsion spring (3).

2. The double torsion spring according to claim 1, characterized in that: The inner torsion spring (2) is wound with several layers of first connecting segments (6), and the outer torsion spring (3) is wound with several layers of second connecting segments (7). The first connecting segments (6) and the second connecting segments (7) are wound in opposite directions.

3. The double torsion spring according to claim 2, characterized in that: The first connecting segment (6) is wound at the beginning and connected to the first foot (4). The first connecting segment (6) is wound at the end and connected to the second foot (5). The second connecting segment (7) is wound at the beginning and connected to the second foot (5). The second connecting segment (7) is wound at the beginning and connected to the first foot (4).

4. The double torsion spring according to claim 3, characterized in that: A connecting part (8) is provided between the two second legs (5), and the two second legs (5) are connected through the connecting part (8) to connect the inner torsion spring (2) and the outer torsion spring (3).

5. The double torsion spring according to claim 1, characterized in that: The angle between the first leg group (a) and the second leg group (b) is c, where c = 110° to 150°.

6. The double torsion spring according to claim 1, characterized in that: The external torsion spring (3) is located between the two first legs (4) and between the two second legs (5).

7. The double torsion spring according to claim 1, characterized in that: The cross-sectional shape of the torsion spring body (1) is rectangular.

8. The double torsion spring according to claim 3, characterized in that: The first connecting segment (6) and the second connecting segment (7) are arranged in a flat configuration.

9. The double torsion spring according to claim 1, characterized in that: The two first legs (4) are arranged parallel to each other and there is a first gap (9) between the two first legs (4). The two second legs (5) are arranged parallel to each other and there is a second gap (10) between the two second legs (5).

10. The double torsion spring according to claim 1, characterized in that: The inner torsion spring (2) and the outer torsion spring (3) are in contact with each other between the first leg group (a) and the second leg group (b), and there is a gap (11) between the inner torsion spring (2) and the outer torsion spring (3) outside the first leg group (a) and the second leg group (b).

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