阅读说明：本技术 一种空间用长寿命平面蜗卷弹簧 (Long-life planar spiral spring for space ) 是由 宋佳 咸奎成 顾珏华 袁伟 倪啸枫 王治易 张雷 陈建礼 于 2021-06-29 设计创作，主要内容包括：本发明提供了一种空间用长寿命平面蜗卷弹簧,所述弹簧类型为接触式平面蜗卷弹簧,在自然状态下呈S形,依次为内端、正向曲率段、反向曲率段)和外端；在轨工作状态下,盘绕在圆形弹簧盒内部、呈螺旋线形,内端以弯钩形式与安装心轴连接固定,外端通过紧固件与弹簧盒连接固定；安装心轴朝不同方向旋转时,将对弹簧施加一定的预紧扭矩,弹簧在该预紧状态下小范围内往复转动,弹簧的形状尺寸与安装芯轴相互匹配,使弹簧在承受相同疲劳载荷的工况下,工作应力低。本发明通过对弹簧形状尺寸、材料性能和润滑措施等方面的技术特征进行特别设计,使平面蜗卷弹簧具备疲劳寿命不小于80万次的有益效果,可应用于有长寿命工作要求的空间机构。(The invention provides a long-life planar spiral spring for a space, which is in a contact type planar spiral spring type, is S-shaped in a natural state, and sequentially comprises an inner end, a forward curvature section and a reverse curvature section) and an outer end; in the working state of the rail, the spring box is coiled inside the circular spring box and is in a spiral line shape, the inner end of the spring box is fixedly connected with the installation mandrel in a hook mode, and the outer end of the spring box is fixedly connected with the spring box through a fastener; when the installation mandrel rotates towards different directions, a certain pre-tightening torque is applied to the spring, the spring rotates in a reciprocating mode in a small range in the pre-tightening state, the shape and the size of the spring are matched with those of the installation mandrel, and therefore the working stress of the spring is low under the working condition that the spring bears the same fatigue load. The invention makes the flat spiral spring have the beneficial effect that the fatigue life is not less than 80 ten thousand times by specially designing the technical characteristics of the spring in the aspects of shape and size, material performance, lubricating measure and the like, and can be applied to a space mechanism with long service life and working requirement.)

1. The utility model provides a long-life plane spiral spring is used in space which characterized in that: the spring type is a contact type flat spiral spring, is S-shaped in a natural state, and sequentially comprises an inner end (1), a forward curvature section (2), a reverse curvature section (3) and an outer end (4); in the working state of the rail, the spring box is coiled inside the circular spring box and is in a spiral line shape, the inner end (1) is fixedly connected with the installation mandrel in a hook mode, and the outer end (4) is fixedly connected with the spring box through a fastener;

when the ground is assembled and adjusted, the rotating installation mandrel applies a certain pre-tightening torque to the spring; when the rail works, the installation mandrel rotates in a reciprocating manner under the action of external force to drive the spring to rotate in a reciprocating manner in a small range under the pre-tightening state, so that the spring bears reciprocating alternating fatigue load; the shape and size of the spring are matched with those of the installation core shaft, so that the working stress of the spring is low under the working condition of bearing the same fatigue load.

2. The long life spatial flat spiral spring as claimed in claim 1, wherein: the spring is a strip material, and the ratio of the thickness h of the strip material to the excircle radius of the mandrel is rAs low as 1% -3%.

3. The long life spatial flat spiral spring as claimed in claim 1, wherein: the ratio of the expansion length L from the starting point of the inner end (1) of the spring to the positive and negative curvature transition point to the outer circumference of the mandrel is up to 4-6 times.

4. The long life spatial flat spiral spring as claimed in claim 1, wherein: one-time reciprocating rotation number of turns n of spring in rail working state₂And the total number of turns n of the rotation that can be output₁Ratio ofAs low as 3% -6%.

5. The long life spatial flat spiral spring as claimed in claim 1, wherein: the spring material is an austenitic stainless steel strip.

6. The long life spatial flat spiral spring as claimed in claim 1, wherein: the spring material has a tensile strength of up to 2000 MPa.

7. The long life spatial flat spiral spring as claimed in claim 1, wherein: the surface of the spring adopts a solid-oil mixed lubricating measure, a ceramic-based composite lubricating film is sputtered firstly, and then a layer of lubricating grease is coated.

8. The long life flat spiral spring as claimed in claim 1, wherein the thickness of the ceramic matrix composite lubricating film is 1-3 um.

Technical Field

The invention relates to the technical field of space mechanisms, in particular to a long-service-life planar spiral spring for a space, which can be applied to a space mechanism with long service life working requirements.

Background

In the design of a space mechanism, in order to achieve the purposes of simple structure, reliable movement, light weight and the like, an elastic element is often selected as a power source for the operation of a driving mechanism; flat spiral springs are one of the commonly used elastic elements in space mechanisms. At present, a planar spiral spring used in a space mechanism in China is only basically used for realizing a one-time action task, is difficult to bear long-term alternating fatigue load, and cannot be suitable for the space mechanism with long-life working requirements.

Disclosure of Invention

The technical problem solved by the invention is as follows: the defect of the prior art is overcome, the long-service-life planar spiral spring for the space is provided, the problem of long service life of the planar spiral spring for the space is solved, and the planar spiral spring for the space can be applied to a space mechanism with long service life working requirements.

The technical scheme of the invention is as follows: a long-life planar spiral spring for space use is a contact planar spiral spring, which is S-shaped in a natural state and sequentially comprises an inner end, a forward curvature section, a reverse curvature section and an outer end; under the working state of the rail, the spring box is coiled inside the circular spring box and is in a spiral line shape, the inner end of the spring box is fixedly connected with the installation mandrel in a hook mode, and the outer end of the spring box is fixedly connected with the spring box through a fastener.

When the ground is assembled and adjusted, the rotating installation mandrel applies a certain pre-tightening torque to the spring; when the rail works, the installation mandrel rotates in a reciprocating manner under the action of external force to drive the spring to rotate in a reciprocating manner in a small range under the pre-tightening state, so that the spring bears reciprocating alternating fatigue load; the shape and size of the spring are matched with those of the installation core shaft, so that the working stress of the spring is low under the working condition of bearing the same fatigue load.

Preferably, the spring is a strip of material having a ratio of the thickness h of the strip to the outer radius r of the mandrelAs low as 1% -3%.

Preferably, the ratio of the expansion length L from the inner end starting point of the spring to the positive and negative curvature transition point to the outer circumference of the mandrel is up to 4-6 times.

Preferably, the spring rotates for n times in a reciprocating way under the rail working state₂And the total number of turns n of the rotation that can be output₁Ratio ofAs low as 3% -6%.

Preferably, the spring material is an austenitic stainless steel strip material, having a tensile strength of up to 2000 MPa.

Preferably, the surface of the spring adopts a solid-oil mixed lubricating measure, a ceramic-based composite lubricating film is sputtered firstly, and then a layer of lubricating grease is coated.

Preferably, the thickness of the ceramic matrix composite lubricating film is 1-3 um.

Compared with the prior art, the invention has the beneficial effects that:

(1) on the basis of reasonably selecting the type of the spring, the invention carries out combined matching design on the shape and the size of the spring; the spring has the beneficial effect of low working stress under the working condition of bearing the same fatigue load.

(2) The spring material of the invention adopts the austenitic stainless steel strip with the tensile strength as high as 2000MPa, so that the spring has the beneficial effect of high fatigue strength.

(3) The surface of the spring adopts a solid-oil mixed lubrication measure under the combined action of the ceramic-based composite lubrication film and the lubricating grease, so that the spring has the beneficial effects of vacuum cold welding prevention, small friction resistance and less wear.

(4) The invention has the beneficial effect that the fatigue life is not less than 80 ten thousand times by specially designing the technical characteristics of the spring in the aspects of shape and size, material performance, lubricating measures and the like, and can be applied to a space mechanism with long service life working requirements.

Drawings

FIG. 1 is a free state diagram of a long life flat spiral spring according to an embodiment of the present invention.

Fig. 2 is a schematic view of the operation state of the long-life flat spiral spring according to the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic view showing a free state of a long-life flat spiral spring, and fig. 2 is a schematic view showing an operating state of the long-life flat spiral spring. As shown in fig. 1, the spring type of the long-life flat spiral spring provided by the invention is a contact flat spiral spring, which is S-shaped in a natural state and comprises an inner end 1, a forward curvature section 2, a reverse curvature section 3 and an outer end 4; under the working state of the rail, the spring box is coiled inside the circular spring box and is in a spiral line shape, the inner end 1 is fixedly connected with the installation mandrel in a hook mode, and the outer end 4 is fixedly connected with the spring box through a fastener.

When the ground is assembled and adjusted, the rotating installation mandrel applies a certain pre-tightening torque to the spring; when the rail works, the installation mandrel rotates in a reciprocating manner under the action of external force to drive the spring to rotate in a reciprocating manner in a small range under the pre-tightening state, so that the spring bears reciprocating alternating fatigue load; the shape and size of the spring are matched with those of the installation core shaft, so that the working stress of the spring is low under the working condition of bearing the same fatigue load.

The fatigue life of the reciprocating rotation of the long-life planar spiral spring for the space is not less than 80 ten thousand times.

As shown in figure 2, the spring is a strip material, and the ratio of the thickness h of the strip material to the excircle radius r of the mandrelAs low as 1 to 3 percent,

the planar spiral spring is used for reducing the working stress of the inner ring of the spring and further ensuring that the planar spiral spring for the space has the fatigue life not less than 80 ten thousand times.

As shown in figure 1, the long-life flat spiral spring has a length L from the starting point of the inner end 1 to the transition point of positive and negative curvature, and the ratio of the length L from the starting point of the inner end 1 to the transition point of positive and negative curvature to the outer circumference of the installation mandrelThe number of the transition points is 4-6, so that the deformation of the transition points during reciprocating rotation of the spring is reduced, the working stress is reduced, and the long-service-life planar spiral spring for the space has the fatigue life of not less than 80 ten thousand.

One-time reciprocating rotation number of turns n of spring in rail working state₂And the total number of turns n of the rotation that can be output₁Ratio ofThe fatigue life of the planar spiral spring for the space is not less than 80 ten thousand times.

The long-life planar volute spring is made of an austenitic stainless steel strip material, has tensile strength up to 2000MPa and high fatigue strength, and further guarantees that the long-life planar volute spring for the space has the fatigue life not less than 80 ten thousand times.

The surface of the long-life planar spiral spring is lubricated by adopting a solid-oil mixed lubricating measure, a ceramic-based composite lubricating film is firstly sputtered, and then a layer of lubricating grease is coated, so that the long-life planar spiral spring is used for preventing vacuum cold welding, reducing the friction resistance and reducing the abrasion during the movement of the spring, and further ensuring that the long-life planar spiral spring for the space has the fatigue life not less than 80 ten thousand times.

The invention makes the flat spiral spring have the beneficial effect that the fatigue life is not less than 80 ten thousand times by specially designing the technical characteristics of the spring in the aspects of shape and size, material performance, lubricating measure and the like, and can be applied to a space mechanism with long service life and working requirement.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.