CN113464617A

CN113464617A - Buffer device

Info

Publication number: CN113464617A
Application number: CN202110778797.8A
Authority: CN
Inventors: 李丰军; 周剑光
Original assignee: China Automotive Innovation Co Ltd
Current assignee: China Automotive Innovation Co Ltd
Priority date: 2021-07-09
Filing date: 2021-07-09
Publication date: 2021-10-01

Abstract

The invention discloses a buffer device, and belongs to the technical field of transmission. The buffer device comprises a body, a connecting structure and at least one contact part, wherein the body is arranged between a ball nut and a limiting end face of a hollow shaft; the connecting structure is arranged on the body and can be fixedly connected with one of the ball screw and the limiting end face; at least one contact site sets up in the body, and the ball screw is close to spacing terminal surface's in-process, and the contact site can contact with another one in spacing terminal surface and the ball screw both. Utilize connection structure to fix the body on ball screw or spacing terminal surface, utilize the contact site on the body can reduce the terminal surface of ball screw and the area of contact of spacing terminal surface, and then avoid the two laminating tension to reduce the frictional force between the terminal surface of ball screw and the spacing terminal surface when ball screw starts, the ball screw normal start of being convenient for. And the body structure is simple, the manufacture is convenient, and the cost is low.

Description

Buffer device

Technical Field

The invention relates to the technical field of transmission, in particular to a buffering device.

Background

The pressure control units of the existing mainstream electromechanical hydraulic servo brake system are all provided with ball screw buffer devices, and when the ball screw works, the ball screw axially reciprocates along the axis of the ball screw and simultaneously rotates around the axis of the ball screw. When the ball screw returns to the bottom, under the action of inertia force, the end face of the screw can be attached to the bottom surface of the hollow shaft, if the inertia force is large, the two are attached to each other too tightly, and then the screw assembly cannot be started. The existing products on the market for reducing the starting friction force of the end face of the ball screw nut are complex in structure and high in cost.

Disclosure of Invention

The invention aims to provide a buffer device which can prevent the end face of a ball screw nut from being attached to a limiting end face, is convenient for the normal start of the ball screw nut, and has a simple structure and low cost.

In order to realize the purpose, the following technical scheme is provided:

a cushioning device, comprising:

the body is arranged between the ball screw nut and the limiting end face of the hollow shaft;

the connecting structure is arranged on the body and can be fixedly connected with one of the ball nut and the limiting end face;

the contact part is arranged on the body, and in the process that the ball screw nut is close to the limiting end face, the contact part can be in contact with the other of the limiting end face and the ball screw nut.

As an alternative to the shock-absorbing device, the contact portion has an abutment surface contactable with the other of the stopper end surface and the ball nut.

As an alternative of the buffering device, the number of the contact parts is multiple, and the multiple contact parts are uniformly distributed on the body.

As an alternative to the damping device, the body, the connecting structure and the contact portion are integrally formed by a stamping process.

As an alternative to the damping device, a lead screw through hole is provided in the center of the body.

As an alternative of the buffering device, the body is disposed on the ball screw, the connecting structure includes a plurality of buckles, the plurality of buckles are disposed at intervals on an outer edge of the body, and the buckles are used for being clamped with a clamping groove of the ball screw to limit the axial movement of the body relative to the ball screw along the ball screw.

As an alternative of the buffering device, the buckle comprises a limiting part and a connecting part connected between the limiting part and the body, and the limiting part and the connecting part are arranged in a T-shaped structure.

As an alternative of the buffering device, the connecting structure further comprises a first vertical flanging arranged on the outer edge of the body, and the first vertical flanging is used for being clamped with an anti-rotation clamping groove of the ball screw so as to limit the body to rotate around the axis of the ball screw relative to the ball screw.

As an alternative of the buffering device, the body is arranged on the limiting end face, the connecting structure comprises a plurality of second vertical flanges, the second vertical flanges are arranged on the inner edge of the body at intervals, and the second vertical flanges are used for being clamped with the grooves in the limiting end face to limit the rotation of the body relative to the limiting end face around the axis of the ball screw.

As an alternative of the buffering device, the connecting structure further comprises a plurality of inclined flanges, the inclined flanges are arranged at intervals on the inner edge of the body and are arranged in a staggered mode with the second vertical flanges, and the inclined flanges are used for being clamped with a limiting table surface of the ball screw so as to limit the axial movement of the body relative to the limiting end surface along the ball screw.

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

the buffer device comprises a body, a connecting structure and at least one contact part, wherein the body is arranged between a ball nut and a limiting end face of a hollow shaft; the connecting structure is arranged on the body and can be fixedly connected with one of the ball screw and the limiting end face; at least one contact site sets up in the body, and the ball screw is close to spacing terminal surface's in-process, and the contact site can contact with another one in spacing terminal surface and the ball screw both. Utilize connection structure to fix the body on ball screw or spacing terminal surface, utilize the contact site on the body can reduce the terminal surface of ball screw and the area of contact of spacing terminal surface, and then avoid the two laminating tension to reduce the frictional force between the terminal surface of ball screw and the spacing terminal surface when ball screw starts, the ball screw normal start of being convenient for. And the body structure is simple, the manufacture is convenient, and the cost is low.

Drawings

Fig. 1 is a schematic structural view of a body and a ball screw nut after assembly in embodiment 1 of the present invention;

fig. 2 is a schematic sectional view of a ball screw with a body assembled therein, a ball screw shaft and a hollow shaft according to embodiment 1 of the present invention;

FIG. 3 is a schematic structural diagram of a main body from a perspective in embodiment 1 of the present invention;

FIG. 4 is a schematic structural diagram of the main body from another perspective in embodiment 1 of the present invention;

FIG. 5 is a schematic structural view of a ball screw viewed from a point of view in embodiment 1 of the present invention;

fig. 6 is a schematic structural view of a ball nut from another perspective in embodiment 1 of the present invention;

FIG. 7 is a schematic view of a hollow mandrel according to example 1 of the present invention;

fig. 8 is a schematic sectional view of a hollow shaft with a body assembled therein, together with a ball screw nut and a ball screw in embodiment 2 of the present invention;

FIG. 9 is a schematic structural view of a main body in embodiment 2 of the present invention;

FIG. 10 is a schematic view of a hollow mandrel according to example 2 of the present invention;

fig. 11 is a schematic structural view of a ball screw according to embodiment 2 of the present invention;

fig. 12 is a schematic structural view of a ball nut in embodiment 2 of the present invention.

Reference numerals:

100. a ball screw nut; 101. an annular neck; 102. clamping the clamping groove; 103. an anti-rotation clamping groove;

200. a ball screw; 201. a limiting table surface;

300. a hollow shaft; 301. a limiting end face; 3011. a kidney-shaped groove;

1. a body; 11. a connecting structure; 111a, a buckle; 1111a and a limiting part; 1112a, a connecting portion; 112a, a first vertical flanging; 111b and a second vertical flanging; 112b, inclined flanging; 12. a contact portion; 121. an abutting surface; 13. and a lead screw is passed through the hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Example 1

As shown in fig. 1 to 7, the present embodiment provides a buffering device for buffering contact between a ball nut 100 and a limiting end surface 301 of a hollow shaft 300, the buffering device includes a body 1, a connecting structure 11 disposed on the body 1, and at least one contact portion 12 disposed on the body 1, the body 1 is disposed between the ball nut 100 and the limiting end surface 301 of the hollow shaft 300; the connecting structure 11 can be fixedly connected with the ball screw nut 100, and the contact part 12 can be in point contact or line contact or surface contact with the limit end surface 301 when the ball screw nut 100 approaches the limit end surface 301. The contact portion 12 may be deformed by being pressed when cushioning, and may form a surface contact. However, the contact form between the contact portion 12 and the stopper end surface 301 is not the important point of the present embodiment, as long as the contact area between the body 1 and the stopper end surface 301 can be reduced by providing the contact portion 12, and the contact form between the contact portion 12 and the stopper end surface 301 is not limited herein.

In this embodiment, the body 1 is a plate-shaped member, the limiting end surface 301 is a bottom surface inside the hollow shaft 300, the hollow shaft 300 is sleeved on the outer side of the ball screw 200, and the ball screw nut 100 is screwed on the ball screw 200. The body 1 is fixed at one end of the ball screw nut 100 through a connecting structure 11, and moves linearly along the axis of the ball screw 200 along with the ball screw nut 100 and rotates around the axis of the ball screw 200; the contact part 12 is used for buffering and limiting when the ball screw 100 returns to the bottom, and meanwhile, the contact area between the body 1 and the limiting end surface 301 can be reduced, so that the starting friction force when the ball screw 100 rotates positively is reduced, and the situation that the ball screw cannot be started due to overlarge friction force is prevented.

Specifically, the center of the body 1 is provided with a lead screw through hole 13. In this embodiment, the screw through hole 13 is a circular hole, and matches with the external shape of the ball screw 200, so that the ball screw 200 can pass through the screw through hole 13 without affecting the normal operation of the ball screw 200.

Specifically, the body 1 is disposed on the ball screw 100, the connecting structure 11 includes a plurality of hooks 111a, the plurality of hooks 111a are disposed at intervals on an outer edge of the body 1, and the hooks 111a are configured to be engaged with a slot of the ball screw 100 to limit axial movement of the body 1 relative to the ball screw 100 along the ball screw 200. The buckle 111a includes a limiting portion 1111a and a connecting portion 1112a connected between the limiting portion 1111a and the body 1, and the limiting portion 1111a and the connecting portion 1112a are arranged in a T-shaped structure. Exemplarily, the draw-in groove of ball screw 100 includes ring groove 101 and joint draw-in groove 102, ring groove 101 sets up in ball screw 100's week side and forms a closed loop, two joint grooves also set up in ball screw 100's week side and set up with the connecting portion 1112a one-to-one of two buckles 111a, connecting portion 1112a joint respectively in the joint draw-in groove 102 that corresponds, spacing portion 1111a all joints in ring groove 101, and spacing portion 1111a be with ring groove 101 assorted cambered surface structure, spacing portion 1111a is the T-shaped structure with connecting portion 1112a simultaneously, and then can carry out axial positioning to body 1, prevent that body 1 is not hard up axially.

Specifically, the connecting structure 11 further includes a first vertical flange 112a disposed on the outer edge of the body 1, and the first vertical flange 112a is used for being clamped with the anti-rotation clamping slot 103 of the ball screw nut 100 to limit the body 1 from rotating around the axis of the ball screw 200 relative to the ball screw nut 100. Correspondingly, the anti-rotation clamping groove 103 is arranged on the peripheral side of the ball screw nut 100 and matched with the first vertical flanging 112a, so that on one hand, the body 1 can be fixed on the ball screw nut 100 through the clamping connection of the first vertical flanging 112a and the anti-rotation clamping groove 103, and on the other hand, the body 1 can be prevented from rotating relative to the ball screw nut 100, so that the body 1 and the ball screw nut 100 are fixed into a whole.

In addition, the connection structure 11 adopts a clamping connection mode to facilitate the disassembly and the replacement of the body 1.

Specifically, the contact portion 12 is convex, and the contact portion 12 has an abutment surface 121, for example, the abutment surface 121 is spherical and can contact with the stopper end surface 301. The contact surface 121 of the spherical structure can further reduce the contact area between the end surface of the body 1 and the limit end surface 301, and further reduce the friction force between the two, so that the ball nut 100 is easier to start. The contact part 12 has a contact surface 12 with a spherical structure, so that the body 1 has a simple structure, is convenient to manufacture and has low cost. For example, the contact portion 12 may be provided in a spherical shape, a semi-spherical shape or a partial spherical shape, so that the contact portion 12 has an abutting surface 121 of a spherical structure. Further, the contact portion 12 may be directly provided on the end surface of the body 1, or may be indirectly provided on a column or the like (the column or the like is directly provided on the end surface of the body 1), as long as the contact portion 12 has the abutting surface 121 of a spherical structure. In other embodiments, the abutting surface may also be an arc shape or another shape (for example, a shape formed by two adjacent surfaces of a polyhedron), as long as the effect of reducing the contact area between the body 1 and the limiting end surface 301 is achieved.

Specifically, the number of the contact portions 12 is plural, and the plural contact portions 12 are uniformly distributed on the body 1. When the ball screw nut 100 returns to the bottom quickly, the plurality of contact parts 12 of the buffer clamping ring are abutted with the limiting end surface 301, and the limiting buffer effect can be achieved. Meanwhile, the contact parts 12 are uniformly distributed on the body 1, so that the body 1 is stressed uniformly, the buffering effect is better, and the service life of the body 1 is prolonged. Illustratively, the number of the contact parts 12 is two, and the two contact parts 12 are located on the same diameter of the body 1, so that the buffer limiting effect is satisfied, and the manufacturing is convenient.

Specifically, the body 1, the connecting structure 11 and the contact part 12 are integrally manufactured by adopting a stamping process, and the connecting structure is small in axial size, compact in structure, small in mass and low in cost.

Example 2

As shown in fig. 8 to 12, the present embodiment provides a buffer device, and the buffer device of the present embodiment is different from embodiment 1 in that: the connecting structure 11 can be fixedly connected with the limiting end surface 301, and the contact part 12 can be contacted with the ball screw nut 100 when the ball screw nut 100 approaches the limiting end surface 301. The body 1 is fixed on the limiting end face 301 through the connecting structure 11, the contact part 12 is utilized to play a role in buffering and limiting when the ball screw nut 100 returns to the bottom, meanwhile, the contact area of the body 1 and the ball screw nut 100 can be reduced, the starting friction force when the ball screw nut 100 rotates positively is further reduced, and the phenomenon that the friction force is too large to start is prevented.

In the present embodiment, the screw passing hole 13 is a kidney-shaped hole.

Specifically, the body 1 is disposed on the limiting end surface 301, the connecting structure 11 includes a plurality of second vertical flanges 111b, the second vertical flanges 111b are disposed at intervals on an inner edge of the body 1, and the second vertical flanges 111b are used for being clamped with a groove on the limiting end surface 301 to limit the body 1 to rotate around the axis of the ball screw 200 relative to the limiting end surface 301. Exemplarily, two second vertical flanges 111b are respectively disposed at two circular arc positions of the waist-shaped hole, the second vertical flanges 111b and the contact portion 12 are respectively located at two sides of the body 1, the second vertical flanges 111b are perpendicular to the end surface of the body 1, and the second vertical flanges 111b are of an arc structure, correspondingly, the groove of the limiting end surface 301 is a waist-shaped groove 3011 matched with the second vertical flanges 111b, and the second vertical flanges 111b are clamped in the waist-shaped groove 3011 for fixing the body 1, and simultaneously can prevent the body 1 from rotating along with the nut when receiving friction force.

Specifically, the connecting structure 11 further includes a plurality of inclined flanges 112b, the inclined flanges 112b are disposed at intervals on the inner edge of the body 1 and are disposed in a staggered manner with the second vertical flange 111b, and the inclined flanges 112b are used for being clamped with the limiting table 201 of the ball screw 200 to limit the axial movement of the body 1 relative to the limiting end surface 301 along the ball screw 200. Illustratively, two inclined flanges 112b are arranged at two straight edge positions of the waist-shaped hole, the inclined flanges 112b and the contact portion 12 are located at the same side of the body 1, correspondingly, two sides of the ball screw 200 are milled with a plane matched with the inclined flanges 112b to form a limiting table 201, so that the body 1 is fixed by the limiting table 201, the body 1 is axially positioned, the body 1 is prevented from moving along the axis of the ball screw 200, and the body 1 is also prevented from rotating along with a nut when being subjected to friction force.

Specifically, the free end of the inclined flange 112b is inclined towards the axis of the body 1, so that the limiting table 201 can be further held tightly, the inclined flange 112b can be prevented from slipping off the limiting table 201, and the body 1 is ensured to be fixed firmly.

In other embodiments, the connection structure 11 and the ball nut 100 or the limiting end surface 301 may also adopt a plug connection manner. Illustratively, the connecting structure 11 includes an insert, and the ball screw nut 100 or the limiting end surface 301 is provided with a plug hole matched with the insert, and the insert is inserted into the plug hole to fix the body 1 on the ball screw nut 100 or the limiting end surface 301. In order to prevent the body 1 from rotating with respect to the ball screw 100 or the stopper end surface 301, the outer shape of the insert may be set to be non-circular, or the number of inserts may be set to be two or more.

In another embodiment, the connecting structure 11 may be a fastener such as a bolt to fix the body 1 to the ball nut 100 or the limiting end surface 301. In order to avoid the protrusion of the end of the fastener and the interference, a stepped hole may be provided on the body 1 for the fastener to be inserted through so as to hide the fastener.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A cushioning device, comprising:

the body (1) is arranged between the ball screw nut (100) and the limiting end surface (301) of the hollow shaft (300);

the connecting structure (11) is arranged on the body (1), and the connecting structure (11) can be fixedly connected with one of the ball screw nut (100) and the limiting end surface (301);

the contact part (12) is arranged on the body (1), and in the process that the ball screw nut (100) is close to the limiting end surface (301), the contact part (12) can be in contact with the other of the limiting end surface (301) and the ball screw nut (100).

2. A buffer device according to claim 1 wherein the contact portion (12) has an abutment surface (121), the abutment surface (121) being contactable with the other of the stop end surface (301) and the ball screw (100).

3. The cushioning device according to claim 1, characterized in that said contact portion (12) is plural in number, and said plural contact portions (12) are uniformly distributed in said body (1).

4. Cushioning device according to claim 1, characterized in that said body (1), said connecting structure (11), said contact portion (12) are made in one piece using a stamping process.

5. A damping device according to any one of claims 1-4, characterized in that the body (1) is provided with a lead screw through hole (13) in its centre.

6. The buffer device according to claim 5, wherein the body (1) is disposed on the ball screw nut (100), the connecting structure (11) comprises a plurality of buckles (111a), the plurality of buckles (111a) are disposed at intervals on an outer edge of the body (1), and the buckles (111a) are used for being clamped with a clamping groove of the ball screw nut (100) so as to limit axial movement of the body (1) relative to the ball screw nut (100) along the ball screw (200).

7. The damping device according to claim 6, characterized in that the buckle (111a) comprises a limit portion (1111a) and a connection portion (1112a) connected between the limit portion (1111a) and the body (1), and the limit portion (1111a) and the connection portion (1112a) are arranged in a T-shaped structure.

8. The buffer device according to claim 7, wherein the connecting structure (11) further comprises a first vertical flange (112a) arranged on the outer edge of the body (1), and the first vertical flange (112a) is used for being clamped with an anti-rotation clamping groove (103) of the ball screw nut (100) so as to limit the body (1) to rotate around the axis of the ball screw (200) relative to the ball screw nut (100).

9. The buffer device according to claim 5, wherein the body (1) is arranged on the limiting end surface (301), the connecting structure (11) comprises a plurality of second vertical flanges (111b), the second vertical flanges (111b) are arranged on the inner edge of the body (1) at intervals, and the second vertical flanges (111b) are used for being clamped with grooves on the limiting end surface (301) so as to limit the rotation of the body (1) relative to the limiting end surface (301) around the axis of the ball screw (200).

10. The buffer device according to claim 9, wherein the connecting structure (11) further comprises a plurality of inclined flanges (112b), the inclined flanges (112b) are arranged at intervals on the inner edge of the body (1) and are arranged in a staggered manner with the second vertical flange (111b), and the inclined flanges (112b) are used for being clamped with a limiting table surface (201) of the ball screw (200) so as to limit the axial movement of the body (1) relative to the limiting end surface (301) along the ball screw (200).