CN219576793U - Self-locking device and lifting motor - Google Patents

Abstract

The utility model relates to the field of machinery, in particular to a self-locking device and a lifting motor. A self-locking device adapted for use with an electric motor, comprising: the self-locking piece is sleeved on the rotor shaft of the motor by a limit sleeve and is provided with a conical outer surface; the elastic piece is sleeved outside the self-locking piece, and the first end of the elastic piece acts on the conical outer surface of the self-locking piece; and the pressing piece presses the second end of the elastic piece, so that the elastic piece is in a compressed state to pinch the self-locking piece on the rotor shaft. A lift motor comprising: a motor including a rotor shaft extending out of an end cap of the motor; the self-locking device is assembled outside the motor, one end with larger outer diameter of the self-locking piece is propped against the end cover, and the pressing piece is fixed on the end cover. The self-locking assembly solves the technical problems that the assembly is complicated and the accuracy is low when the self-locking assembly in the prior art is assembled, and also solves the problem that the self-locking force of the existing self-locking piece is reduced after the existing self-locking piece is used for a period of time.

Description

Self-locking device and lifting motor

Technical Field

The utility model relates to the field of machinery, in particular to a self-locking device and a lifting motor.

Background

In the prior art, the lifting motor is widely used and is applied to structures such as body building equipment, running machines, elliptical machines and spinning, and how to realize self-locking is an important aspect affecting the service performance of the lifting motor.

A motor with braking function for an actuating device is proposed as in the document with application number CN201220011549.7, and specifically discloses: a motor with braking function for an actuation device, comprising: a motor body; the rotating shaft is connected to the center of the motor body in a penetrating way; the braking mechanism comprises a braking ring and a spiral spring, wherein the braking ring consists of a plurality of arc plates, the spiral spring is wound around the outer edge of each arc plate, and each arc plate is sleeved on the outer periphery of the rotating shaft; and a stop mechanism arranged between the motor body and the brake mechanism for limiting the rotation of any one of the arc plates.

In the above document, the braking ring has good braking and decelerating efficiency due to the large contact area between the braking ring and the rotating shaft, but the braking ring consists of a plurality of discrete arc plates, and the plurality of arc plates have no connection relation, so that the plurality of arc plates are required to be assembled respectively during assembly, and the complexity and difficulty of assembly are increased. In addition, a plurality of arc plates of the brake ring are wound by the spiral spring to provide self-locking force, once the arc plates are worn, gaps exist between the brake ring and the rotating shaft, the spiral spring cannot enable the brake ring to be clamped on the rotating shaft, and then the problem of self-locking force reduction occurs.

Disclosure of Invention

In order to solve the problems that a brake structure on a motor in the prior art is complex in assembly and high in assembly difficulty during assembly; the utility model provides a self-locking device and a lifting motor, which solve the technical problem that the self-locking force is reduced after a period of use. The technical scheme of the utility model is as follows:

the utility model provides a self-locking device, which is suitable for a motor and comprises:

the self-locking piece is sleeved on a rotor shaft of the motor by a limiting sleeve and is provided with a conical outer surface;

the elastic piece is sleeved outside the self-locking piece, and the first end of the elastic piece acts on the conical outer surface of the self-locking piece;

and the pressing piece presses the second end of the elastic piece, so that the elastic piece is in a compressed state to pinch the self-locking piece on the rotor shaft.

The self-locking device is provided with the self-locking part which is of an integral structure and sleeved on the rotor shaft of the motor, the elastic part is sleeved on the conical outer surface of the self-locking part, when the elastic part is pressed by the pressing part, the elastic part can uniformly press the conical outer surface, the acting force of the elastic part on the self-locking part has a component force in the radial direction, and further the self-locking part can shrink inwards and is hooped on the rotor shaft, and the self-locking part is limited and cannot rotate, so that the self-locking part can generate self-locking effect on the rotor shaft to stop the rotation of the rotor shaft. The self-locking part is taken as a whole, so that the self-locking part can be assembled integrally, and the complexity of assembly is reduced; the elastic piece is sleeved on the self-locking piece to act on the self-locking piece, so that the elastic piece acts on the self-locking piece uniformly, and the self-locking piece can be ensured to act on the rotor shaft uniformly in the circumferential direction. In addition, the elastic piece is compressed by the compressing piece in an axial compression state, even if the self-locking piece is worn due to friction between the self-locking piece and the rotor shaft, the compressing piece can still be compressed on the conical outer surface of the self-locking piece, so that the self-locking piece is kept in a contracted state and is hooped on the rotor shaft, and the elastic piece with the required specification can be reasonably selected during assembly; compared with the prior art, the spiral spring is wound around the outer edge of each arc-shaped plate, each arc-shaped plate tightly holds the rotating shaft by the radial acting force of the spiral spring, and after the spiral spring is used for a long time, the inner surface of the arc-shaped plate, which is in contact with the rotating shaft, is easy to have a gap after being worn, so that the self-locking effect cannot be achieved.

According to one embodiment of the utility model, the self-locking member comprises a plurality of self-locking split bodies, and two adjacent self-locking split bodies are connected into a whole through a connecting part.

According to one embodiment of the utility model, the self-locking split body is U-shaped, and two branches of the opening end of the self-locking split body are respectively connected with the adjacent self-locking split bodies through connecting parts.

According to one embodiment of the present utility model, the thickness of the opening end of the self-locking split body is greater than the thickness of the other end, and the thickness of the opening end of the self-locking split body is greater than the thickness of the connecting portion.

According to one embodiment of the utility model, the self-locking member is circumferentially limited by the compression member.

According to one embodiment of the utility model, the axial length of at least one self-locking split body is smaller than that of the adjacent self-locking split bodies to form a groove, and the pressing piece is correspondingly formed with a protrusion which can extend into the groove to limit the circumference of the self-locking piece.

According to one embodiment of the utility model, the axial end of the self-locking element is extended with a limiting protrusion, and the limiting protrusion is circumferentially limited.

According to one embodiment of the utility model, the elastic member is a compression spring.

The utility model also provides a lifting motor, comprising:

a motor including a rotor shaft extending out of an end cap of the motor;

the self-locking device is assembled outside the motor, one end with larger outer diameter of the self-locking piece is propped against the end cover, and the pressing piece is fixed on the end cover.

According to one embodiment of the utility model, the self-locking member is extended with a limit protrusion, the end cover is correspondingly formed with a limit groove, and the limit protrusion extends into the limit groove to limit the self-locking member circumferentially.

Based on the technical scheme, the utility model has the following technical effects:

1. the self-locking device is provided with the self-locking part which is of an integral structure and sleeved on the rotor shaft of the motor, the elastic part is sleeved on the conical outer surface of the self-locking part, when the elastic part is pressed by the pressing part, the elastic part can uniformly press the conical outer surface, the acting force of the elastic part on the self-locking part has a component force in the radial direction, and further the self-locking part can shrink inwards and is hooped on the rotor shaft, and the self-locking part is limited and cannot rotate, so that the self-locking part can generate self-locking effect on the rotor shaft to stop the rotation of the rotor shaft. The self-locking part is taken as a whole, so that the self-locking part can be assembled integrally, and the complexity of assembly is reduced; the elastic piece is sleeved on the self-locking piece to act on the self-locking piece, so that the elastic piece acts on the self-locking piece uniformly, and the self-locking piece can be ensured to act on the rotor shaft uniformly in the circumferential direction. In addition, the elastic piece is compressed by the compressing piece in an axial compression state, even if the self-locking piece is worn due to friction between the self-locking piece and the rotor shaft, the compressing piece can still be compressed on the conical outer surface of the self-locking piece, so that the self-locking piece is kept in a contracted state and is hooped on the rotor shaft, and the elastic piece with the required specification can be reasonably selected during assembly; compared with the prior art, the spiral spring is wound around the outer edge of each arc-shaped plate, each arc-shaped plate tightly holds the rotating shaft by the radial acting force of the spiral spring, after long-term use, the inner surface of the arc-shaped plate, which is in contact with the rotating shaft, is worn, gaps are easily reserved, and the self-locking effect cannot be achieved;

2. the self-locking device comprises a plurality of self-locking split bodies, and the adjacent self-locking split bodies are connected into a whole through the connecting part, so that the self-locking device is convenient to assemble; the self-locking split body is U-shaped, so that when the elastic piece acts on the self-locking piece, the self-locking piece can shrink inwards and is hooped on the rotor shaft;

3. according to the self-locking device, the self-locking piece can be circumferentially limited by the pressing piece, the pressing piece can be extended with the bulge, the self-locking piece can shorten at least one self-locking split body to form the groove, and the bulge and the groove are matched to achieve the effect of circumferentially limiting the self-locking piece; or the self-locking piece can be extended with a bulge, and the self-locking piece is matched with an end cover or other fixing structures of the motor to realize circumferential limit of the self-locking piece;

4. the lifting motor provided by the utility model has the advantages that the self-locking device is assembled outside the motor, so that the self-locking device can be conveniently disassembled and assembled and maintained in the later period. By arranging the self-locking device, under the condition that the motor is powered off, the rotor shaft can be self-locked, and the lifted object is prevented from suddenly falling.

Drawings

Fig. 1 is a schematic structural diagram of a lifting motor according to a first embodiment of the present utility model;

FIG. 2 is an exploded view of the lift motor;

FIG. 3 is a schematic view of the self-locking device assembled on the motor;

FIG. 4 is a cross-sectional view of the structure shown in FIG. 3;

FIG. 5 is a schematic view of the structure of the self-locking member and the elastic member when assembled together;

FIG. 6 is a schematic structural view of a self-locking member;

FIG. 7 is a schematic view of the structure of the pressing member;

FIG. 8 is a schematic diagram of the structure of the motor;

fig. 9 is a schematic structural diagram of a lifting motor according to a second embodiment of the present utility model;

FIG. 10 is a schematic view of the self-locking device assembled on the motor;

FIG. 11 is a cross-sectional view of the structure shown in FIG. 10;

FIG. 12 is a schematic view of the self-locking member and resilient member assembled to the rotor shaft;

fig. 13 is an enlarged view of a portion a in fig. 12;

FIG. 14 is a schematic view of the structure of the self-locking member and the elastic member when assembled together;

FIG. 15 is a schematic view of the structure of the self-locking member;

in the figure: 1-a self-locking piece; 11-self-locking split; 12-connecting part; 121-limit protrusions; 13-grooves; 2-an elastic member; 3-a pressing member; 31-through holes; 311-bump; 4-an electric motor; 41-rotor shaft; 42-end caps; 421-extensions; 4211-a limit groove; 5-locking member.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

Example 1

As shown in fig. 1-8, the present embodiment provides a self-locking device, which is suitable for a motor 4, and comprises a self-locking member 1, an elastic member 2 and a pressing member 3, wherein the self-locking member 1 is sleeved on a rotor shaft 41 of the motor 4, the elastic member 2 is sleeved outside the self-locking member 1, the pressing member 3 presses the elastic member 2, the elastic member 2 acts on the self-locking member 1, and the self-locking member 1 is hooped on the rotor shaft 41. Since the self-locking member 1 is circumferentially limited and cannot rotate, the self-locking member 1 will exert a braking action on the rotor shaft 41 when the self-locking member 1 is tightened on the rotor shaft 41.

The self-locking part 1 is in a sleeve-shaped structure, the self-locking part 1 comprises a plurality of self-locking split bodies 11, and two adjacent self-locking split bodies 11 are connected into a whole through a connecting part 12. Specifically, the self-locking split bodies 11 are in a U shape, and two branches at the opening end of the self-locking split body 11 are respectively connected with the adjacent self-locking split bodies 11 through connecting parts 12.

As a preferred solution of this embodiment, the self-locking body 1 has a tapered outer surface, i.e. the thickness of each tapered split 11 is set to be variable, specifically the thickness of the open end of the tapered split 11 is greater than the thickness of the other end.

As a preferable solution of the present embodiment, the thickness of the connecting portion 12 is smaller than the thickness of the opening end of the tapered split body 11. Thus, during assembly, the connecting part 12 can be inserted into the end cover 42 of the motor 4, and the opening end of the conical split 11 can be abutted against the end cover 42, so that axial limit is realized.

As a preferred technical solution of this embodiment, the number of the self-locking split bodies 11 is even, the even number of the self-locking split bodies 11 are uniformly distributed along the circumferential direction at intervals, and the connection portion 12 plays a role of connecting two adjacent self-locking split bodies 11.

The elastic member 2 acts on the self-locking member 1, and when the pressing member 3 presses the elastic member 2, the pressing member 3 can provide the elastic member 2 with a force perpendicular to the tapered outer surface, the force having a component in a radial direction, so that the self-locking member 1 can be hooked on the rotor shaft 41 of the motor 4.

Specifically, the first end of the elastic piece 2 is sleeved at one end with smaller outer diameter of the self-locking piece 1, and the first end of the elastic piece 2 is abutted against the conical outer surface of the self-locking piece 1; the second end of the elastic member 2 is pressed by the pressing member 3, and when the pressing member 3 is fixedly assembled, the pressing member 3 can axially press the elastic member 2, so that the elastic member 2 is axially compressed, the first end of the elastic member 2 acts on the tapered outer surface of the self-locking member 1, and the acting force has a component force in the radial direction, so that the self-locking member 1 is contracted inwards and is hooped on the rotor shaft 41. Since the elastic member 2 is in an axially compressed state at the time of assembly, even if the inner peripheral surface of the self-locking member 1 is worn due to friction, the elastic member 2 can act on the self-locking member 1 to pinch the self-locking member 1 against the rotor shaft 41.

As a preferred solution of this embodiment, the elastic member 2 is optionally but not limited to a compression spring.

The compressing element 3 may be used to compress the elastic element 2, in this embodiment, the compressing element 3 is configured as a cover structure, the compressing element 3 may be covered outside the elastic element 2 and the self-locking element 1, the compressing element 3 is fixedly assembled, specifically, two opposite sides of the compressing element 3 are formed with connecting portions, and the fastening member 5 passes through the compressing element 3 to fixedly assemble the compressing element 3.

As a preferred solution of the present embodiment, the pressing member 3 is formed with a through hole 31, and the rotor shaft 41 may protrude from the through hole 31, i.e., the pressing member 3 and the rotor shaft 41 are not in contact with each other. In this embodiment, the end face of the shaft end of the rotor shaft 41 is substantially flush with the outer end face of the through hole 31 of the pressing member 3, so that space is saved and assembly of the whole structure is facilitated.

In order to limit the circumferential rotation of the self-locking member 1, in this embodiment, the self-locking member 1 is limited circumferentially by the pressing member 3, specifically, the axial length of at least one self-locking body 11 of the self-locking member 1 is shortened, the axial length thereof is smaller than that of the adjacent self-locking body 11 to form a groove 13, and the groove 13 is located at one axial end of the self-locking member 1 with smaller thickness; correspondingly, the inner peripheral surface of the through hole 31 of the pressing piece 3 is extended with a protrusion 311, and when the pressing piece is assembled, the protrusion 311 can extend into the groove 13 to limit the self-locking piece 1, so that the self-locking piece 1 cannot rotate.

As a preferred technical scheme of the embodiment, the number of the grooves 13 is two, the self-locking part 1 comprises an even number of self-locking split bodies 11 which are more than 2, and the two opposite self-locking split bodies 11 axially shorten the stroke of the two grooves 13; correspondingly, the number of the protrusions 311 is two, the two protrusions 311 are oppositely arranged, and the stability and the balance of circumferential limitation can be realized by arranging two limiting positions.

The present embodiment also provides a lifting motor, which comprises the self-locking device and a motor 4, wherein the motor 4 is provided with a rotor shaft 41, an end cover 42 is further arranged at the end part of the motor 4, the rotor shaft 41 extends out of the end cover 42, and the self-locking device is assembled outside the motor 4, in particular on the part of the rotor shaft 41 extending out of the end cover 42.

As a preferred technical solution of this embodiment, one end of the rotor shaft 41 is a driving end, the other end of the rotor shaft 41 is a non-driving end, the non-driving end of the rotor shaft 41 extends out of the end cover 42, and the self-locking device is assembled on the non-driving end of the rotor shaft 41.

As a preferred solution of this embodiment, the middle portion of the end cover 42 is formed with an extension 421 protruding outwards, and a circular opening is formed on the extension 421 to facilitate the rotor shaft 41 to pass through, and a gap is formed between the circular opening and the rotor shaft 41. When the self-locking device is assembled on the motor 4, one end of the self-locking piece 1 with larger outer diameter is abutted against the end cover 42, specifically, the connecting part 12 of the self-locking piece 1 can extend between the circular opening and the rotor shaft 41, and the circumferential edge of the circular opening can be abutted against the end face of one end of all the self-locking split bodies 11 with larger thickness so as to axially limit the self-locking piece 1; the pressing member 3 is fixed on the end cover 42 by the fastener 5, and when the pressing member 3 is assembled, the two protrusions 311 of the pressing member are correspondingly inserted into the two grooves 13 of the self-locking member 1.

Example two

As shown in fig. 9 to 15, this embodiment is basically the same as the first embodiment, except that the structure for circumferentially limiting the self-locking member 1 is different.

In this embodiment, the protrusion 311 is not required to be formed on the inner peripheral surface of the through hole 31 of the pressing member 3, and all the self-locking split bodies 11 of the self-locking member 1 have the same structure, and the groove 13 is not required to be formed. In this embodiment, the self-locking member 1 is circumferentially limited by the end cap 42, specifically, a limiting protrusion 121 is formed on the outer surface of the connecting portion 12 of the self-locking member 1 in a protruding manner, correspondingly, a limiting groove 4211 is formed at a circular opening of the extending portion 421 of the end cap 42, and after assembly, the limiting protrusion 121 can extend into the limiting groove 4211 to realize circumferential limitation of the self-locking member 1.

As the preferable technical scheme of the embodiment, the two limit protrusions 121 and the two limit grooves 4211 are respectively distributed uniformly in the circumferential direction, so that the balance and uniformity of the circumferential limit can be ensured.

In addition to the above structure arrangement, the recess 13 and the protrusion 311 of the first embodiment may be simultaneously arranged with the limiting protrusion 121 and the limiting recess 4211 of the second embodiment, so as to perform a dual circumferential limiting function.

The embodiments of the present utility model have been described in detail with reference to the drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present utility model.

Claims (10)

1. A self-locking device suitable for an electric motor (4), characterized in that it comprises:

the self-locking piece (1), the self-locking piece (1) is sleeved on a rotor shaft (41) of the motor (4) by a limit sleeve, and the self-locking piece (1) is provided with a conical outer surface;

the elastic piece (2) is sleeved outside the self-locking piece (1), and the first end of the elastic piece acts on the conical outer surface of the self-locking piece (1);

the compressing piece (3) compresses the second end of the elastic piece (2), so that the elastic piece (2) is in a compressed state to pinch the self-locking piece (1) on the rotor shaft (41).

2. A self-locking device according to claim 1, characterized in that the self-locking element (1) comprises a plurality of self-locking sub-bodies (11), two adjacent self-locking sub-bodies (11) being connected into a whole by means of a connecting portion (12).

3. A self-locking device according to claim 2, characterized in that the self-locking split (11) is U-shaped, and two branches of the opening end of the self-locking split (11) are connected with adjacent self-locking split (11) through connecting parts (12), respectively.

4. A self-locking device according to claim 3, wherein the thickness of the open end of the self-locking split (11) is greater than the thickness of the other end, the thickness of the open end of the self-locking split (11) being greater than the thickness of the connecting portion (12).

5. A self-locking device according to claim 3, characterized in that the self-locking element (1) is circumferentially limited by the compression element (3).

6. A self-locking device according to claim 5, wherein at least one self-locking split (11) has an axial length smaller than that of an adjacent self-locking split (11) to form a groove (13), and the pressing member (3) is correspondingly formed with a protrusion (311), and the protrusion (311) can extend into the groove (13) to limit the circumference of the self-locking member (1).

7. A self-locking device according to claim 3, characterized in that the axial end of the self-locking element (1) is extended with a limit projection (121), the limit projection (121) being circumferentially limited.

8. A self-locking device according to any one of claims 1-7, wherein said elastic member is a compression spring.

9. A lift motor, comprising:

-an electric motor (4), the electric motor (4) comprising a rotor shaft (41), the rotor shaft (41) extending out of an end cap (42) of the electric motor (4);

the self-locking device according to any one of claims 1 to 8, being assembled outside the motor (4), wherein the end of the self-locking element (1) with the larger outer diameter is abutted against the end cover (42), and the pressing element (3) is fixed on the end cover (42).

10. A lifting motor according to claim 9, wherein the self-locking member (1) is extended with a limiting protrusion (121), the end cover (42) is correspondingly formed with a limiting groove (4211), and the limiting protrusion (121) extends into the limiting groove (4211) to limit the self-locking member (1) circumferentially.