CN220711264U - Motor with unidirectional self-locking function and linear actuator - Google Patents

Abstract

The utility model provides a motor with a unidirectional self-locking function and a linear actuator, which comprises a motor body and a self-locking device, wherein the motor body comprises a motor shaft, the self-locking device is arranged on the motor shaft, the self-locking device comprises a unidirectional transmission piece, a first friction piece, a second friction piece and an adjusting piece, the motor shaft is connected with the first friction piece through the unidirectional transmission piece so as to enable the motor shaft to generate relative rotation with the first friction piece in a forward rotation state, the first friction piece is driven to rotate in a reverse rotation state of the motor shaft, the first friction piece is contacted with the second friction piece for self-locking in a reverse rotation state of the motor shaft, and the adjusting piece is movably arranged on the motor body and is used for adjusting the contact pressure between the second friction piece and the first friction piece. The utility model has the advantages that the larger locking torque requirement of the whole motor transmission system can be met only by providing smaller locking torque, the interaction force between friction surfaces is reduced, and the abrasion is reduced; the pressure of the static friction part and the dynamic friction part is adjustable, and the locking torque is adjustable.

Description

Motor with unidirectional self-locking function and linear actuator

Technical Field

The utility model relates to the technical field of unidirectional self-locking mechanisms, in particular to a motor with unidirectional self-locking function and a linear actuator.

Background

In the application process of the transmission mechanism, in order to prevent the transmission mechanism from backing, a unidirectional self-locking mechanism is usually required to be arranged so as to ensure the reliability of driving in place and avoid movement under the action of external force. Such as a linear actuating device, generally comprises a driving motor, a transmission screw driven by the driving motor, and a transmission nut for converting rotation of the transmission screw into linear movement, in order to improve driving stability of the driving motor, a speed reducing assembly, such as a worm gear speed reducing mechanism, is usually arranged between the transmission screw and the driving motor, and at present, self-locking of the linear actuator generally enables a self-locking structure to be arranged on the screw to prevent reverse rotation of the screw.

As in chinese patent document, publication No. CN110778673a, the application for a self-locking device for a linear actuator and a linear actuator, which are issued in the grant of 11 d 2/c 2020, includes a one-way bearing and a friction collar, the one-way bearing includes an inner ring and an outer ring, the inner ring is used for being fitted to a rotating screw rod of the linear actuator, the friction collar is connected to the outer ring, the self-locking device further includes a friction member for cooperating with the friction collar, when the rotating screw rod rotates in the forward direction, the outer ring does not rotate, and when the rotating screw rod rotates in the reverse direction, the outer ring, the inner ring and the friction collar rotate synchronously, and the friction collar contacts with the friction member to generate friction force.

The unidirectional self-locking mechanism of the linear actuator in the prior art has the following defects: 1. the unidirectional self-locking mechanism is arranged at the output end of the motor after the motor is decelerated, the locking torque required by the system for achieving the unidirectional self-locking function is large, the locking torque is directly provided by the friction piece, the interaction force between the friction surfaces is large, the two friction surfaces are seriously heated when sliding, and the abrasion and the failure are extremely easy to cause; 2. the locking moment of the unidirectional self-locking mechanism cannot be adjusted, and the performance of the unidirectional self-locking mechanism cannot be ensured after the abrasion degree of the friction surface is increased.

Disclosure of Invention

The utility model provides a motor with a unidirectional self-locking function and a linear actuator, which aim to overcome the defects in the prior art.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the motor with the unidirectional self-locking function comprises a motor body and a self-locking device, wherein the motor body comprises a motor shaft, the self-locking device is arranged on the motor shaft, the self-locking device comprises a unidirectional transmission piece, a first friction piece, a second friction piece and an adjusting piece, the motor shaft is connected with the first friction piece through the unidirectional transmission piece, so that the motor shaft rotates relatively with the first friction piece in a forward rotation state, the motor shaft drives the first friction piece to rotate in a reverse rotation state, the first friction piece contacts with the second friction piece to be used for self-locking in a reverse rotation state of the motor shaft, and the adjusting piece is movably arranged on the motor body and is used for adjusting the contact pressure between the second friction piece and the first friction piece.

In the motor with the unidirectional self-locking function, the motor body further comprises a motor shell, the end face of the motor shell is provided with the fixing ring seat protruding outwards, and the adjusting piece is sleeved on the fixing ring seat and can axially move relative to the fixing ring seat.

In the motor with the unidirectional self-locking function, the adjusting piece comprises a connecting ring and a pressure part which are fixed relatively, the connecting ring is in threaded connection with the fixed ring seat, the pressure part transmits axial pressure to the second friction piece, and the axial movement of the adjusting piece relative to the fixed ring seat is realized through threads.

In the motor with the unidirectional self-locking function, one of the fixed ring seat and the second friction piece is provided with the axially extending limit groove, the other one is provided with the limit block matched with the limit groove, the limit block is slidably arranged in the limit groove to limit the second friction piece to rotate, and the axial movement guiding of the fixed ring seat and the second friction piece is realized.

In the motor with the unidirectional self-locking function, the fixed ring seat comprises a threaded part and a limiting part, wherein the threaded part and the connecting ring are sequentially arranged outwards from the end face of the motor casing, the threaded part and the connecting ring are provided with matched threads, and the limiting groove is positioned on the limiting part and forms an opening at one end, far away from the threaded part, of the limiting part.

In the motor with the unidirectional self-locking function, the second friction piece is an elastomer.

Or the second friction piece is a rigid part, the self-locking device further comprises an elastic piece, and the adjusting piece transmits acting force to the second friction piece through the elastic piece.

In the motor with the unidirectional self-locking function, the first friction piece is provided with a first axial friction surface, the second friction piece is provided with a second axial friction surface which is abutted against the first axial friction surface, and the self-locking is completed through the contact friction between the first axial friction surface and the second axial friction surface in the motor shaft reversing state.

In the motor with the unidirectional self-locking function, the first friction piece is provided with the first conical friction surface, the second friction piece is provided with the second conical friction surface which is abutted against the first conical friction surface, and the self-locking is completed through the contact friction between the first conical friction surface and the second conical friction surface in the motor shaft reversing state.

In the motor with the unidirectional self-locking function, the unidirectional transmission part is a unidirectional bearing, an inner ring of the unidirectional bearing is fixedly connected with the motor shaft, and an outer ring of the unidirectional bearing is fixedly connected with the first friction part.

The linear actuator comprises a speed reducing mechanism and the motor, the front end of the motor shaft is in transmission connection with the speed reducing mechanism, and the self-locking device is arranged at the front end of the motor shaft.

Or the linear actuator comprises a speed reducing mechanism and the motor, the front end of the motor shaft is in transmission connection with the speed reducing mechanism, and the self-locking device is arranged at the rear end of the motor shaft.

The utility model has the advantages that:

the motor with the unidirectional self-locking function comprises a motor body and a self-locking device, wherein the motor body comprises a motor shaft, the self-locking device is arranged on the motor shaft and comprises a unidirectional transmission piece, a first friction piece, a second friction piece and an adjusting piece, the motor shaft is connected with the first friction piece through the unidirectional transmission piece so as to enable the motor shaft to rotate relatively with the first friction piece in a forward rotation state, the first friction piece is driven to rotate in a reverse rotation state of the motor shaft, the first friction piece is in contact with the second friction piece for self-locking in the reverse rotation state of the motor shaft, and the adjusting piece is movably arranged on the motor body and is used for adjusting the contact pressure of the second friction piece and the first friction piece.

The self-locking device is directly arranged on the motor shaft and positioned at the output end before the motor is decelerated, the torque received by the self-locking device is small, when the self-locking device acts, the contact friction force generated by the first friction piece and the second friction piece is used as self-locking force to realize the unidirectional locking of the motor, the requirement of the whole motor transmission system for larger locking torque can be met only by providing smaller locking torque, the interaction force between the friction surfaces of the first friction piece and the second friction piece, which are contacted with each other, is reduced, the abrasion is reduced, and the unidirectional self-locking performance is more stable; the pressure of the second friction piece and the first friction piece can be adjusted through the arrangement of the adjusting piece, so that the self-locking effect is prevented from being deteriorated due to abrasion of the first friction piece and the second friction piece.

Further, the motor body further comprises a motor shell, the end face of the motor shell is provided with a fixing ring seat protruding outwards, and the adjusting piece is sleeved on the fixing ring seat and can axially move relative to the fixing ring seat. The fixed ring seat is used for accommodating the unidirectional transmission piece, the first friction piece and the second friction piece, and the pressure between the first friction piece and the second friction piece can be conveniently completed by adjusting the axial positions of the adjusting piece and the fixed ring seat.

Further, the adjusting piece comprises a connecting ring and a pressure part which are fixed relatively, the connecting ring is in threaded connection with the fixed ring seat, the pressure part transmits axial pressure to the second friction piece, and axial movement of the adjusting piece relative to the fixed ring seat is realized through threads. The axial positions of the fixed ring seat and the adjusting piece are adjusted through threads, so that the adjustment quantity is convenient to control, and the adjustment efficiency is high; the pressure part is used for adjusting the axial pressure of the second friction piece when the position of the adjusting piece is adjusted on the fixed ring seat, so that the adjustment of the friction resistance between the first friction piece and the second friction piece is realized.

Further, one of the fixed ring seat and the second friction piece is provided with an axially extending limit groove, the other one of the fixed ring seat and the second friction piece is provided with a limit block matched with the limit groove, the limit block is slidably arranged in the limit groove to limit the second friction piece to rotate, and the axial movement guiding of the fixed ring seat and the second friction piece is realized. The sliding fit of the limiting block and the limiting groove enables the second friction piece not to rotate relative to the motor body, the self-locking effect of the second friction piece and the first friction piece during abutting fit is guaranteed to be reliable, meanwhile, axial sliding guiding between the fixed ring seat and the second friction piece is achieved, axial displacement of the second friction piece can be adjusted simultaneously when the axial position of the adjusting piece is adjusted, and pressure adjustment between the second friction piece and the first friction piece is achieved.

Further, the fixed ring seat comprises a threaded portion and a limiting portion, wherein the threaded portion and the limiting portion are sequentially arranged outwards from the end face of the motor casing, the threaded portion and the connecting ring are provided with matched threads, and the limiting groove is located on the limiting portion and forms an opening at one end, far away from the threaded portion, of the limiting portion. Screw thread portion and spacing portion separation set up, and the spacing groove opening is in order to make things convenient for the packing into of stopper, and the spacing groove is located the slip direction that is used for the stopper on the spacing portion, does not set up the screw thread on the spacing portion, and the screw thread portion at screw thread place is annular structure, does not have fracture department, can prevent the condition that the screw thread jump tooth from appearing to avoid the spacing groove to produce the interference to the rotation of screw thread, improve the reliability of regulating part axial adjustment.

Further, the second friction member is an elastomer. When the adjusting piece compresses tightly the second friction piece, the pressure effect can be through the elastic deformation of second friction piece self direct with the pressure conversion of adjusting piece for the pressure between first friction piece and the second friction piece, it is convenient to adjust.

Further, the second friction piece is a rigid part, and the self-locking device further comprises an elastic piece, and the adjusting piece transmits acting force to the second friction piece through the elastic piece. The pressure between the first friction piece and the second friction piece is adjusted through the elastic piece in a matched mode, the second friction piece is a rigid part, and therefore the friction piece has higher friction coefficient, wear resistance coefficient and structural strength, elastic requirements are not required to be considered, and the service life of the second friction piece is guaranteed.

Further, the first friction piece is provided with a first axial friction surface, the second friction piece is provided with a second axial friction surface which is abutted against the first axial friction surface, and self-locking is completed through contact friction between the first axial friction surface and the second axial friction surface in a motor shaft reversing state. The arrangement of the first axial friction surface and the second axial friction surface can respond to the pressure change of the second friction piece when the adjusting piece moves axially, the contact pressure between the second friction piece and the first friction piece can be completely converted into locking force, and the locking effect of the first friction piece and the second friction piece is ensured to be reliable.

Further, the first friction piece is provided with a first conical friction surface, the second friction piece is provided with a second conical friction surface which is abutted against the first conical friction surface, and self-locking is completed through contact friction between the first conical friction surface and the second conical friction surface in a motor shaft reversing state. The first friction piece and the second friction piece are matched through the first conical friction surface and the second conical friction force, when the pressure of the adjusting piece born by the first friction piece and the second friction piece is increased, the adjusting piece has axial force and radial acting pressure, and the friction locking performance is remarkably improved.

Further, the unidirectional transmission piece is a unidirectional bearing, an inner ring of the unidirectional bearing is fixedly connected with the motor shaft, and an outer ring of the unidirectional bearing is fixedly connected with the first friction piece. The unidirectional transmission of the motor shaft and the first friction piece is realized through the unidirectional bearing, unidirectional self-locking of the motor shaft is realized, and the structure is convenient to set.

The linear actuator comprises a speed reducing mechanism and the motor, the front end of the motor shaft is in transmission connection with the speed reducing mechanism, and the self-locking device is arranged at the front end of the motor shaft; or the linear actuator comprises a speed reducing mechanism and the motor, the front end of the motor shaft is in transmission connection with the speed reducing mechanism, and the self-locking device is arranged at the rear end of the motor shaft.

The linear actuator combining the motor with the unidirectional self-locking function in any technical scheme has all effects of the motor, the position of the front end and the rear end of the self-locking device on the motor shaft can be determined according to the needs, and the adaptability is strong.

These features and advantages of the present utility model will be disclosed in detail in the following detailed description and the accompanying drawings.

Drawings

FIG. 1 is a schematic diagram of one embodiment of the present utility model;

FIG. 2 is a schematic view of the structure of a one-way bearing according to one embodiment of the present utility model;

FIG. 3 is an exploded view of the structure of one embodiment of the present utility model;

FIG. 4 is a schematic view of the embodiment of FIG. 3 at another angle;

FIG. 5 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 6 is a schematic view of a partial cross-sectional structure of a self-locking device in one embodiment of the utility model;

FIG. 7 is a schematic diagram of one embodiment of the present utility model;

FIG. 8 is a schematic view of a partial cross-sectional structure of a self-locking device in one embodiment of the utility model;

FIG. 9 is a schematic view of a partial cross-sectional structure of a self-locking device in one embodiment of the present utility model.

In the figure:

the device comprises a fixed ring seat 1, a limit groove 11, a threaded part 12 and a limit part 13;

the adjusting piece 2, the connecting ring 21, the end plate 22, the convex ring 23, the annular groove 24 and the internal thread 25;

the first friction piece 3, the ring part 31, the outer flange part 32 and the axial ring section 33;

a motor shaft 40, a motor housing 41 and a worm 42;

a one-way bearing 5, an outer race 51, an inner race 52;

an elastic member 6;

the second friction piece 7, the limiting block 71, the first friction plate 701 and the second friction plate 702;

a first axial friction surface 101, a second axial friction surface 102;

a first conical friction surface 111, a second conical friction surface 112.

Detailed Description

The motor with the unidirectional self-locking function comprises a motor body and a self-locking device, wherein the motor body comprises a motor shaft, the self-locking device is arranged on the motor shaft and comprises a unidirectional transmission piece, a first friction piece, a second friction piece and an adjusting piece, the motor shaft is connected with the first friction piece through the unidirectional transmission piece so as to enable the motor shaft to rotate relatively with the first friction piece in a forward rotation state, the first friction piece is driven to rotate in a reverse rotation state of the motor shaft, the first friction piece is in contact with the second friction piece for self-locking in the reverse rotation state of the motor shaft, and the adjusting piece is movably arranged on the motor body and is used for adjusting the contact pressure of the second friction piece and the first friction piece.

Because self-locking device directly sets up on the motor shaft, be located the output before the motor speed reduction, the moment of torsion that receives is little, when self-locking device acts on, the contact frictional force that first friction piece and second friction piece produced is as the unidirectional locking of self-locking force realization motor, first friction piece and second friction piece only need provide less locking moment of torsion just can satisfy the great locking moment of torsion requirement of whole motor drive system, reduce the interaction force between the friction surface, reduce wearing and tearing, make locking performance more stable, and locking moment's size is adjustable, because the locking moment that needs to provide is less, this locking subassembly can miniaturized design, the cost is reduced.

The unidirectional transmission member is used for unidirectional transmission between the motor shaft and the first friction member, wherein the unidirectional transmission refers to unidirectional transmission of rotation between the motor shaft and the first friction member, and axial movement between the motor shaft and the first friction member is not involved. The unidirectional transmission member has two inner peripheral parts and an outer part Zhou Lingjian which can be differentiated, and the inner Zhou Lingjian of the unidirectional transmission member can be fixedly arranged on the motor shaft or can be sleeved on the outer periphery of the motor shaft in a sliding way along the axial direction of the motor shaft. For example, the unidirectional transmission member may be a unidirectional bearing sleeved on the motor shaft, the inner peripheral part and the outer peripheral part of the unidirectional transmission member are respectively an inner ring and an outer ring of the unidirectional bearing, the inner ring is connected with the motor shaft, and the outer ring is connected with the first friction member; for another example, the unidirectional transmission member may be a ratchet wheel that moves with the motor shaft and a toothed collar that cooperates with the ratchet wheel and is fixed with the first friction member, the inner peripheral part and the outer peripheral part of the unidirectional transmission member are the ratchet wheel and the collar, respectively, and unidirectional transmission between the motor shaft and the first friction member is realized by unidirectional transmission in which the ratchet wheel and the collar rotate relatively, and of course, the unidirectional transmission member may be other unidirectional transmission rotation members other than the above two members.

According to the utility model, the first friction piece rotates and moves with the peripheral part of the unidirectional transmission piece, the first friction piece can be fixedly connected with the peripheral part of the unidirectional transmission piece, a limit structure is arranged on the peripheral part of the unidirectional transmission piece in the radial direction, a transmission structure corresponding to the limit structure of the peripheral part is arranged on the first friction piece, and the rotation and the movement of the first friction piece and the peripheral part of the unidirectional transmission piece are realized through the cooperation of the limit structure and the transmission structure.

In the utility model, a friction resistance is arranged between the second friction piece and the first friction piece, a contact friction surface is adopted between the second friction piece and the first friction piece, the friction resistance is not less than the rotation self-locking force of the motor shaft, when the motor is in a forward rotation state, the unidirectional transmission piece does not transmit torque, the motor shaft and the first friction piece relatively rotate, the second friction piece contacts and rubs with the first friction piece, but the motor shaft is not affected by the friction resistance of the first friction piece and the second friction piece, and the rotation of the motor shaft is not affected by the self-locking device. When the motor is in a reverse rotation state, the unidirectional transmission part transmits the torque of the motor shaft to the first friction part, and the first friction part can rotate along with the motor shaft, but the second friction part forms a locking effect on the friction resistance of the first friction part, so that the first friction part cannot rotate, and the motor shaft cannot rotate along with the first friction part, thereby realizing unidirectional self-locking of the motor shaft.

The adjusting piece is movably arranged on the motor body, so that the position of the adjusting piece can be adjusted, the contact pressure of the second friction piece relative to the first friction piece can be adjusted through the position adjustment of the adjusting piece, and further the friction resistance between the first friction piece and the second friction piece is adjusted, and the self-locking force of the motor shaft is adjusted. The movable connection means that the adjusting piece is connected to the motor body, when the adjusting piece is not acted by external force and only is acted by the reaction force of the second friction piece in the connected process, the position of the adjusting piece is kept unchanged, so that the reliable adjustment of the contact pressure between the first friction piece and the second friction piece is realized, when the adjusting piece is acted by external force except the reaction force of the second friction piece, the position of the adjusting piece can be changed, the pressure of the changed adjusting piece to the second friction piece is changed, the pressure can correspond to the contact pressure between the first friction piece and the second friction piece, and the change of the friction resistance between the first friction piece and the second friction piece is completed through the change of the position of the adjusting piece.

In order to increase the response of the second friction member to the axial position change of the position of the adjustment member, the second friction member may be an elastic body or the second friction member may be a rigid member and the rigid member is provided with an elastic member to be engaged with the adjustment member.

The technical solutions of the embodiments of the present utility model will be explained and illustrated below with reference to the drawings of the embodiments of the present utility model, but the following embodiments are only preferred embodiments of the present utility model, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The motor with unidirectional self-locking function according to one embodiment of the present utility model, referring to fig. 1 to 5, comprises a motor body and a self-locking device, wherein the motor body comprises a motor shaft 40, the self-locking device is mounted on the motor shaft 40, the self-locking device comprises a unidirectional transmission member, a first friction member 3, a second friction member 7 and an adjusting member 2, the motor shaft 40 and the first friction member 3 are connected through the unidirectional transmission member, so that the motor shaft 40 and the first friction member 3 generate relative rotation in a forward rotation state of the motor shaft 40, the first friction member 3 is driven to rotate in a reverse rotation state of the motor shaft 40, the first friction member 3 is contacted with the second friction member 74 for self-locking in a reverse rotation state of the motor shaft 40, and the adjusting member 2 is movably mounted on the motor body for adjusting contact pressure between the second friction member 7 and the first friction member 3.

In order to facilitate the setting of the self-locking device and the adjusting member 2, in this embodiment, the motor body further includes a motor housing, and the end surface of the motor housing has a fixing ring seat 1 protruding outwards, where the fixing ring seat 1 and the motor shaft 40 are coaxially arranged. The shape of the fixed ring seat 1 is a cylinder which extends outwards from the end face of the motor shell and is provided with an opening at the outer end in the axial direction, one end of the motor shaft 40 extends into the fixed ring seat 1, after the unidirectional transmission piece and the first friction piece 3 are sequentially installed on the motor shaft 40, the second friction piece 7 is arranged in the fixed ring seat 1, the fixed ring seat 1 limits the circumferential rotation of the second friction piece 7, and finally the adjusting piece 2 and the fixed ring seat 1 are installed. The adjusting piece 2 is sleeved on the fixed ring seat 1 and can axially move relative to the fixed ring seat 1. In order to facilitate the adjustment of the axial position of the adjusting piece 2 and control the adjustment quantity, the adjusting piece 2 is in threaded connection with the fixed ring seat 1, and the axial movement of the adjusting piece 2 relative to the fixed ring seat 1 is realized through threads. In this embodiment, the adjusting member 2 includes a relatively fixed connecting ring 21 and a pressure portion, the connecting ring 21 is in threaded connection with the fixed ring seat, the pressure portion transmits axial pressure to the second friction member 7, and as shown in fig. 5, for example, the fixed ring seat 1 is provided with external threads, and the adjusting ring 21 is provided with internal threads 25 matching the external threads. An end plate 22 is provided at one end of the connection ring 21, and an internal thread 25 is provided on an inner circumference of an end of the connection ring 21 opposite to the end plate 22. The end plate 22 is provided with a convex ring 23 on the side facing the inside of the connecting ring 21, and the position of the convex ring 23 corresponds to the position of the second friction member 7 sleeved on the first friction member 3, that is, the convex ring 23 is a pressure part for transmitting axial pressure to the second friction member 7. In order to ensure that the fixing ring seat 1 and the connecting ring 21 can be screwed in place, the connecting effect of the fixing ring seat 1 and the connecting ring 21 is improved, the outer peripheral wall of the convex ring 23 and the inner peripheral wall of the connecting ring 21 are coaxially arranged at intervals, and a ring groove 24 capable of accommodating the end part of the fixing ring seat 1 is formed between the outer peripheral wall of the convex ring 23 and the inner peripheral wall of the connecting ring 21.

In order to avoid the second friction piece 7 and the first friction piece 3 rotating together under the action of the motor shaft 40 and improve the adjusting capability of the second friction piece 7 in response to the adjusting piece 2, one of the fixed ring seat 1 and the second friction piece 7 is provided with an axially extending limiting groove 11, the other one is provided with a limiting block 71 matched with the limiting groove 11, and the limiting block 71 is slidably arranged in the limiting groove 11 to limit the rotation of the second friction piece 7 and realize the axial movement guiding of the fixed ring seat 1 and the second friction piece 7. For example, as shown in fig. 3, the limiting groove 11 is located on the fixed ring seat 1, the limiting groove 11 is disposed along the axial direction of the fixed ring seat 1, the limiting block 71 matched with the limiting groove 11 is disposed on the second friction member 7, and the rotation of the second friction member 7 is limited by the limiting block 71 and the limiting groove 11. Meanwhile, through the sliding fit of the limiting block 71 and the limiting groove 11, the second friction piece 7 can respond to the adjustment of the axial displacement of the adjusting piece 2, and the adjustment reliability of the contact pressure between the second friction piece 7 and the first friction piece 3 is improved. As can be seen from fig. 1 and 3, two groups of two symmetrical central groups of limiting grooves 11 are arranged on two sides of the axis of the fixed ring seat 1, so as to perform symmetrical circumferential constraint limiting and axial guiding functions.

As the simple replacement of this scheme, can set up the stopper on fixed ring seat 1 inner periphery, the stopper sets up along the axial of fixing base, and sets up the spacing groove of cooperation stopper on second friction piece 7.

As simple transformation of the scheme, the limit grooves 11 can be set into one group, three groups or four groups and the like in the circumferential direction of the fixed ring seat 1, and the limit blocks are provided with the corresponding limit grooves. When the plurality of limiting grooves 11 are provided, the limiting grooves may not be arranged symmetrically about the axis center of the fixed ring seat 1.

In this embodiment, as shown in fig. 4, the fixed ring seat 1 includes a threaded portion 12 and a limiting portion 13 which are sequentially disposed outwards from the end face of the motor casing 41, the threaded portion 12 is provided with a matched thread with the connecting ring 21, an external thread is disposed on the threaded portion 12, the external thread is connected with an internal thread 25 in the connecting ring, the limiting groove 11 is located on the limiting portion 13, interference between the limiting groove 11 and the position of the thread during assembly can be avoided, occurrence of the situation of tooth jump is avoided, connection reliability of the adjusting member 2 and the fixed ring seat 1 is ensured, and an opening is formed at one end, away from the threaded portion 12, of the limiting groove 13, and assembly of the limiting block 71 and the limiting groove 11 is facilitated through the opening, so that efficiency of assembling and disassembling the second friction member 7 and the fixed ring seat 1 is improved.

In the present embodiment, the one-way transmission member is a one-way bearing 5, and as shown in fig. 2, the one-way bearing 5 includes an inner race 52 and an outer race 51. The inner ring 52 of the one-way bearing 5 is fixedly connected with the motor shaft 40, and as shown in fig. 1 and 3, the outer ring 51 of the one-way bearing 5 is fixedly connected with the first friction member 3. The first friction member 3 includes a ring portion 31 which is interference fitted with the outer periphery of the outer ring 51, and in order to cope with the pressure of the second friction member 7 in the axial direction of the first friction member 3, the first friction member 3 is prevented from slipping off the one-way bearing 5, and the first friction member 3 includes an axial ring segment 33 corresponding to the end portion of the outer ring 51. The shape of the axial ring segment 33 is circular, the inner circumference of the axial ring segment 33 is positioned outside the inner ring 52, namely, the inner circumference of the axial ring segment 33 is not contacted with the inner ring 52, and the axial ring segment 33 is positioned at one end of the outer ring 51 opposite to the motor casing, so that the reliability of the connection between the unidirectional bearing 5 and the first friction piece 3 is improved.

In order to improve the reliability of the friction between the first friction member 3 and the second friction member 7, the first friction member 3 has a first axial friction surface 101, and the second friction member 7 has a second axial friction surface 102 abutting against the first axial friction surface 101. The self-locking is accomplished by the contact friction of the first axial friction surface 101 and the second axial friction surface 102 in the reversed state of the motor shaft 40. For example, referring to fig. 3 to 5, the first friction member 3 includes a ring portion 31 having an interference fit with the outer circumference of the outer ring 51, an outer protrusion 32 is provided on the ring portion 31, and the ring portion 31 is circular in shape. The outer flange 32 is annular in shape. The external diameter of the outer part 32 is larger than the external diameter of the ring part 31, the axial length of the outer part 32 is smaller than the axial length of the ring part 31, the outer circumferences of the outer part 32 and the ring part 31 are provided with mounting grooves in the form of shaft shoulders, the second friction piece 7 is of a circular ring structure, and the second friction piece 7 is arranged in the mounting grooves. Both the groove bottom and the groove wall of the mounting groove can be used for frictional locking with the second friction member 7. The first axial friction surface 101 is the end surface of the outer flange 32 facing the second friction member 7, i.e., the groove bottom position of the installation groove. The second axial friction surface 102 is an end surface of the second friction member 7 facing the first friction member 3. The outer flange 32 is located at one end of the ring 31 facing the motor casing to obtain a larger peripheral area of the ring 31, and when the multi-layer second friction piece 7 is arranged, the inner Zhou Jun of the multi-layer second friction piece 7 can cooperate with the periphery of the ring 31 to play an auxiliary friction self-locking role.

As an alternative to this embodiment, the first friction member 3 has a first conical friction surface 111 and the second friction member 7 has a second conical friction surface 112 abutting the first conical friction surface 111. The self-locking is accomplished by the contact friction of the first tapered friction surface 111 and the second tapered friction surface 112 in the reversed state of the motor shaft 41. Illustratively, as shown in fig. 9, the end surface of the outer protrusion 32 facing the second friction member 7 in the first friction member 3 is a first conical friction surface 111, the first conical friction surface 111 is a truncated conical surface, the second conical friction surface 112 is also a truncated conical surface, and the second conical friction surface 112 is in contact with the first conical friction surface 111.

In the motor with the unidirectional self-locking function provided by one embodiment of the utility model, the second friction piece 7 is an elastomer. As shown in fig. 8, the second friction member 7 is in a circular ring shape, two axial ends of the second friction member 7 are respectively abutted against the adjusting member 2 and the first friction member 3, and when the adjusting member 2 is adjusted in axial position, the second friction member 7 is elastically deformed by being axially pressed, so that the pressure of the adjusting member 2 is transmitted to be a locking pressure between the first friction member 3 and the second friction member 7.

The motor with the unidirectional self-locking function provided by one embodiment of the utility model, the second friction piece 7 is a rigid component, the self-locking device further comprises an elastic piece 6, and the adjusting piece 2 transmits acting force to the second friction piece 7 through the elastic piece 6. Illustratively, as shown in fig. 6, the second friction member 7 is circular in shape, the elastic member 6 is a disc spring, and the second friction member 7 and the elastic member 6 are disposed along the axial direction of the motor shaft 40. The end face of the second friction piece 7 facing the first friction piece 3 and the inner peripheral surface of the second friction piece 7 are respectively in contact fit with the first friction piece 3, one second friction piece 7 is arranged, and one disc spring is also arranged. When the axial position of the adjusting piece 2 is adjusted, acting force is transmitted to the second friction piece 7 through the disc spring, so that the contact pressure of the first friction piece 3 and the second friction piece 7 is adjusted.

As another example shown in fig. 4, the second friction member 7 has a ring structure, and the difference from the previous embodiment is that two second friction members 7 are provided, two disc springs and two second friction members 7 are alternately arranged along the axial direction of the motor shaft 403, it can be understood that the second friction member 7 includes a first friction plate 701 and a second friction plate 702 arranged along the axial direction of the motor shaft 40, and a disc spring is provided between the first friction plate 701 and the second friction plate 702, and the second friction plate 702 is provided between two adjacent disc springs.

The elastic piece 6 and the second friction piece 7 can be used singly or in a plurality of overlapped mode, and the expandability is high.

The process of pressure adjustment between the first friction member 3 and the second friction member 7 is illustrated in the embodiments shown in fig. 1 to 5. During assembly, the one-way bearing 5 is sleeved on the motor shaft 40 to be fixed, the first friction piece 3 is sleeved on the outer ring 51 of the one-way bearing 5 through the ring part 31 and locked in an interference mode, the first friction piece 3 and the one-way bearing 5 can be directly preassembled, the second friction piece 7 and the fixed ring seat 1 are assembled, the first friction piece 701 slides into the fixed ring seat 1 through the matching of the limiting block 71 and the limiting groove 11 of the fixed ring seat 1, one end of the first friction piece 701 is attached to one end of the outer lug 32 of the first friction piece 3, after a disc spring is assembled, the second friction piece 702 is assembled, the limiting block 71 of the second friction piece 702 slides into the limiting groove 11 of the fixed ring seat 1, then a disc spring is arranged in the fixed ring seat 7, and finally the adjusting piece 2 and the fixed ring seat 1 are assembled through threads. When the self-locking force of the motor shaft 40 needs to be increased, the adjusting piece 2 is screwed in, the pressure part of the adjusting piece 2 presses the disc spring, so that the deformation amount of the disc spring is increased, the axial pressure of the first friction plate 701 and the second friction plate 702 is increased, and the friction force between the first friction plate 701 and the first friction piece 3 is increased, namely the self-locking force of the motor shaft 40 is increased. And otherwise, the 4 self-locking force of the motor shaft can be reduced.

Referring to fig. 1, the linear actuator according to one embodiment of the present utility model includes a speed reducing mechanism and the above motor, where the front end of the motor shaft 40 is in transmission connection with the speed reducing mechanism, the speed reducing mechanism is exemplified by a worm gear and worm assembly, the motor shaft 40 is connected with a worm 42, the worm 42 drives a worm wheel to rotate, and the self-locking device is located on the motor shaft 40 that is not being reduced, and since the worm gear and worm assembly is a mature prior art in the art, the present application will not be described in detail, in fig. 1, only the worm 42 connected with the motor shaft 40 is illustrated, in fig. 1, the worm 42 is an integral structure with the motor shaft 40, and may also be actually configured as a split structure, as can be seen from fig. 1, the self-locking device is disposed at the rear end of the motor shaft 40. In this embodiment, the end of the adjusting member 2 is closed to achieve protection of the unidirectional locking mechanism, avoiding entry of impurities.

Referring to fig. 7, the motor provided in one embodiment of the present utility model includes a speed reducing mechanism and the motor, where the front end of the motor shaft 40 is in transmission connection with the speed reducing mechanism, the speed reducing mechanism is exemplified by a worm gear assembly, the motor shaft 40 is connected with a worm 42, and the self-locking device is located on the motor shaft 40 that is not decelerated, and since the worm gear speed reducing mechanism is a mature prior art in the art, the application is not described in detail, in fig. 7, only the worm 42 connected with the motor shaft 40 is illustrated, the worm 42 in fig. 7 is an integral structure with the motor shaft 40, and may actually be provided as a split structure, in this embodiment, the end of the adjusting member 2 is provided with a through hole for the motor shaft 40 to pass through, the through hole and the motor shaft 40 are sealed by rotation of a sealing ring, and the sealing ring also plays a role in collision buffering between the adjusting member 2 and the motor shaft 40, which not only ensures the extension application of the worm at the end of the motor shaft 40, but also can protect the unidirectional locking mechanism.

The above is only a specific embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and it should be understood by those skilled in the art that the present utility model includes but is not limited to the accompanying drawings and the description of the above specific embodiment. Any modifications which do not depart from the functional and structural principles of the present utility model are intended to be included within the scope of the appended claims.

Claims (10)

1. The motor with the unidirectional self-locking function comprises a motor body and a self-locking device, wherein the motor body comprises a motor shaft, the self-locking device is arranged on the motor shaft, and the motor is characterized in that the self-locking device comprises a unidirectional transmission piece, a first friction piece, a second friction piece and an adjusting piece, the motor shaft and the first friction piece are connected through the unidirectional transmission piece, so that the motor shaft and the first friction piece generate relative rotation in a forward rotation state, the motor shaft drives the first friction piece to rotate in a reverse rotation state, the first friction piece and the second friction piece are in contact for self locking in a reverse rotation state of the motor shaft, and the adjusting piece is movably arranged on the motor body and is used for adjusting the contact pressure of the second friction piece and the first friction piece.

2. The motor with the unidirectional self-locking function according to claim 1, wherein the motor body further comprises a motor shell, an end face of the motor shell is provided with a fixing ring seat protruding outwards, and the adjusting piece is sleeved on the fixing ring seat and can axially move relative to the fixing ring seat.

3. The motor with unidirectional self-locking function as claimed in claim 2, wherein the adjusting member comprises a relatively fixed connecting ring and a pressure part, the connecting ring is in threaded connection with the fixed ring seat, the pressure part transmits axial pressure to the second friction member, and axial movement of the adjusting member relative to the fixed ring seat is realized through threads.

4. The motor with unidirectional self-locking function as claimed in claim 3, wherein one of the fixed ring seat and the second friction member is provided with an axially extending limit groove, the other one is provided with a limit block matched with the limit groove, the limit block is slidably arranged in the limit groove to limit the second friction member to rotate, and the axial movement guiding of the fixed ring seat and the second friction member is realized.

5. The motor with unidirectional self-locking function according to claim 4, wherein the fixed ring seat comprises a threaded portion and a limiting portion which are sequentially arranged outwards from the end face of the motor casing, the threaded portion and the connecting ring are provided with matched threads, and the limiting groove is located on the limiting portion and forms an opening at one end, far away from the threaded portion, of the limiting portion.

6. The motor with unidirectional self-locking function as claimed in claim 1, wherein the second friction member is an elastomer; or the second friction piece is a rigid part, the self-locking device further comprises an elastic piece matched with the second friction piece, and the adjusting piece transmits acting force to the second friction piece through the elastic piece.

7. The motor with one-way self-locking function according to one of claims 1 to 6, wherein the first friction member has a first axial friction surface, the second friction member has a second axial friction surface abutting against the first axial friction surface, and self-locking is accomplished by contact friction of the first axial friction surface and the second axial friction surface in a motor shaft reversal state.

8. The motor with one-way self-locking function according to one of claims 1 to 6, wherein the first friction member has a first tapered friction surface, the second friction member has a second tapered friction surface abutting against the first tapered friction surface, and self-locking is accomplished by contact friction of the first tapered friction surface and the second tapered friction surface in a motor shaft reversing state.

9. The motor with one-way self-locking function according to one of claims 1 to 6, wherein the one-way transmission member is a one-way bearing, an inner ring of the one-way bearing is fixedly connected with the motor shaft, and an outer ring of the one-way bearing is fixedly connected with the first friction member.

10. A linear actuator comprising a speed reducing mechanism and the motor according to any one of claims 1 to 9, wherein the front end of the motor shaft is in transmission connection with the speed reducing mechanism, and the self-locking device is arranged at the front end of the motor shaft; or the self-locking device is arranged at the rear end of the motor shaft.