U-shaped spring

Abstract

The utility model discloses a U-shaped spring. A line segment BC on the inner side of the upper portion of a U-shaped spring body is perpendicular to the extension line of a line segment DA on the upper surface of the bottom of the U-shaped spring. The thickness of the bottom of the U-shaped spring is t3; the middle side line segment BB2 of the U-shaped spring is parallel to the top line segment CC1, and the thickness of the U-shaped spring BB2 is t2; the thickness of the upper CC1 part of the U-shaped spring is t1; the thickness relation of each part of the U-shaped spring is t3gt; t2gt; t2gt; t1; t1 / t3 is 2 / 3, a line segment C1B1 on the outer side of the upper portion of the U-shaped spring body and an arc A1B1 on the outer side of the U-shaped spring body are tangent to the point B1, the curvature radius of the arc A1B1 segment is gradually decreased from the point A1 to the point B1, and at least two fixing holes are formed in the two sides of the upper portion of the U-shaped spring respectively. According to the utility model, the U-shaped spring is reasonably designed; not only is the sensitivity of the U-shaped spring met, but also a device at the rear end of the U-shaped spring is protected, and the rigidity of the U-shaped spring is increased along with the increase of the compression amount; and the upper end of the U-shaped spring is gradually thinned, so that the self weight of the U-shaped spring is reduced, and the material cost is reduced.

Description

Technical Field

[0001] This utility model relates to a spring, and more particularly to a U-shaped spring. Background Technology

[0002] Springs, as fundamental components in mechanical equipment, are used in many fields of modern industry, especially in the machinery, railway, construction, and nuclear power industries. The demand for spring devices is increasing. In existing technologies, the upper fixed mounting port of a U-shaped spring has a rectangular cross-section, a uniform thickness, and concentric circular arcs on the inner and outer sides of the spring, resulting in constant stiffness and linear force characteristics. However, in practical applications, some special scenarios require U-shaped springs with stiffness increasing with spring compression, while exhibiting non-linear force characteristics. For example, in the application of obstacle detection devices at the front of subway train engines, it is necessary to meet the sensitivity requirements of the detector while protecting the train head at the rear of the U-shaped spring. Therefore, a variable stiffness U-shaped spring is urgently needed. Utility Model Content

[0003] In view of this, the technical problem to be solved by this utility model is to provide a U-shaped spring with a reasonable design and gradually increasing stiffness.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] A U-shaped spring includes a U-shaped spring body. The upper inner line segment BC of the U-shaped spring body is perpendicular to the extension line of the upper surface line segment DA of the bottom of the U-shaped spring. The thickness of the bottom of the U-shaped spring is t3. The middle side line segment BB2 of the U-shaped spring is parallel to the top line segment CC1, and the thickness of the U-shaped spring at BB2 is t2. The thickness of the upper part CC1 of the U-shaped spring is t1. The thickness relationship of each part of the U-shaped spring is t3>t2>t1. The t1 / t3 is 2 / 3. The upper outer line segment C1B1 of the U-shaped spring body is tangent to the outer arc A1B1 of the U-shaped spring body at point B1. The radius of curvature of the arc A1B1 gradually decreases from point A1 to point B1. At least two fixing holes are provided on each side of the upper part of the U-shaped spring.

[0006] Preferably, the radius of curvature of the arc segment A1B1 is 3t3. <RA1B1<4t3 。

[0007] Preferably, the inner arc AB of the middle part of the U-shaped spring is a circular arc.

[0008] Preferably, the radius of the arc AB on the inner side of the middle part of the U-shaped spring is RAB=3t3.

[0009] Preferably, the outer side of the U-shaped spring is linearly thinner between B1 and C1.

[0010] Preferably, four fixing holes are symmetrically arranged on both sides of the upper part of the U-shaped spring respectively, which has higher installation stability.

[0011] From the above technical solutions, the beneficial effects of the present utility model are as follows:

[0012] Compared with the prior art, the present utility model reasonably designs the U-shaped spring. The extension line of the inner side line segment BC of the upper part of the U-shaped spring body 1 is perpendicular to the upper surface line segment DA of the U-shaped spring bottom. The curvature radius of the arc segment A1B1 gradually decreases from point A1 to point B1. The thickness relationship of each part of the U-shaped spring is t3>t2>t1, and t1 / t3 is 2 / 3. The arc radius RAB of the inner side arc AB in the middle of the U-shaped spring is 3t3. The curvature radius of the arc segment A1B1 is 3t3<RA1B1<4t3, which not only meets the sensitivity of the U-shaped spring but also protects the device at the rear end of the U-shaped spring. The stiffness of the front section of the U-shaped spring during compression is small, and as the compression amount increases, the stiffness also increases. At the same time, since the upper end of the U-shaped spring gradually becomes thinner, the weight of the U-shaped spring itself is reduced, and the material cost is lowered. Description of the Drawings

[0013] Figure 1 is a structural schematic diagram of the present utility model;

[0014] Figure 2 is a schematic diagram of the force value characteristic comparison between the utility model and the conventional U-shaped spring. Detailed Embodiments

[0015] In order to enable those skilled in the art to further understand the features and technical content of the present utility model, please refer to the following detailed description and drawings of the present utility model. <​​​​​

[0017] As Figure 1 shown, the radius of curvature of the arc segment A1B1 is 3t3 < RA1B1 < 4t3; the inner arc AB in the middle of the U-shaped spring is a circular arc, and the arc radius RAB of the inner arc AB in the middle of the U-shaped spring is 3t3.

[0018] As Figure 2 shown, the force value characteristic curve of a conventional U-shaped spring is linear; the force value characteristic curve of the U-shaped spring of this patent gradually increases as the compression amount of the U-shaped spring increases; it not only meets the sensitivity requirements of the U-shaped spring, that is, the stiffness in the front section of the compression amount of the U-shaped spring is small, but also protects the device at the rear end of the U-shaped spring. As the compression amount increases, the stiffness also increases; it meets the characteristics of timely and safe triggering of the U-shaped spring; and has good recovery ability after safe triggering; since the upper end of the U-shaped spring gradually becomes thinner, it also reduces the weight of the U-shaped spring itself and lowers the material cost.

[0019] However, the above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the patent scope of the present invention. Therefore, all equivalent structural changes made by using the content of the specification and drawings of the present invention are similarly included in the scope of the present invention.

Claims

1. A U-shaped spring, comprising a U-shaped spring body, characterized in that: The upper inner line segment BC of the U-shaped spring body (1) is perpendicular to the extension line of the upper surface line segment DA of the bottom of the U-shaped spring; the thickness of the bottom of the U-shaped spring is t3; the middle side line segment BB2 of the U-shaped spring is parallel to the top line segment CC1, and the thickness of the U-shaped spring at BB2 is t2; the thickness of the upper part CC1 of the U-shaped spring is t1; the thickness relationship of each part of the U-shaped spring is t3>t2>t1; the t1 / t3 is 2 / 3, the upper outer line segment C1B1 of the U-shaped spring body (1) is tangent to the outer arc A1B1 of the U-shaped spring body (1) at point B1, and the radius of curvature of the arc A1B1 gradually decreases from point A1 to point B1. At least two fixing holes (2) are provided on both sides of the upper part of the U-shaped spring.

2. A U-shaped spring as described in claim 1, characterized in that: The radius of curvature of the arc segment A1B1 is 3t3 <RA1B1<4t3 。 3. A U-shaped spring as described in claim 1, characterized in that: The inner arc AB in the middle of the U-shaped spring is a circular arc.

4. A U-shaped spring as described in claim 3, characterized in that: The radius of the arc AB on the inner side of the middle part of the U-shaped spring is RAB = 3t3.

5. A U-shaped spring as described in claim 1, characterized in that: The outer side of the U-shaped spring is linearly thinner between B1 and C1.

6. A U-shaped spring as described in claim 1, characterized in that: The upper part of the U-shaped spring is provided with four fixing holes (2) symmetrically on both sides.

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