CN110729847A - Motor self-locking device of linear actuator and linear actuator - Google Patents

Motor self-locking device of linear actuator and linear actuator Download PDF

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Publication number
CN110729847A
CN110729847A CN201910958232.0A CN201910958232A CN110729847A CN 110729847 A CN110729847 A CN 110729847A CN 201910958232 A CN201910958232 A CN 201910958232A CN 110729847 A CN110729847 A CN 110729847A
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China
Prior art keywords
motor
output shaft
outer ring
motor output
locking device
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Pending
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CN201910958232.0A
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Chinese (zh)
Inventor
胡仁昌
陆小健
其他发明人请求不公开姓名
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Zhejiang Jiecang Linear Motion Technology Co Ltd
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Zhejiang Jiecang Linear Motion Technology Co Ltd
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Priority to CN201910958232.0A priority Critical patent/CN110729847A/en
Priority to CN202010512598.8A priority patent/CN111884418A/en
Publication of CN110729847A publication Critical patent/CN110729847A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/102—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction brakes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

The invention discloses a motor self-locking device of a linear actuator, which belongs to the field of linear actuating equipment, wherein the motor self-locking device is sleeved on a motor output shaft and comprises an outer ring member and a cylinder, the outer ring member is sleeved outside the motor output shaft, at least one deflection groove is formed on the outer ring member towards one side of the motor output shaft, the cylinder is arranged in the deflection groove, the radial distance of the deflection groove is gradually reduced along the reverse direction of the motor output shaft, and when the motor output shaft rotates towards the reverse direction, the cylinder is driven to move towards one end with small radial distance, so that the cylinder and the outer ring member form interference fit. The invention also discloses a linear actuator adopting the motor self-locking device. The advantage of the invention is that the self-locking capability of the linear actuator can be increased.

Description

Motor self-locking device of linear actuator and linear actuator
[ technical field ] A method for producing a semiconductor device
The invention relates to a motor self-locking device of a linear actuator and the linear actuator, and belongs to the field of linear actuating equipment.
[ background of the invention ]
The linear actuator is widely applied to various fields at present, including electric lifting tables, electric beds, electric sofas and the like, and the structure of the linear actuator generally comprises a driving motor, a rotating lead screw and a transmission nut, wherein the driving motor drives the rotating lead screw to rotate, the transmission nut is driven to axially move when the rotating lead screw rotates, and the transmission nut can be connected with a driving object, so that the driving purpose is realized.
However, for such a linear actuator, a self-locking function is essential, such as an electric lifting table, for example, an electric bed, that is, in a state where the motor is not operated, the linear actuator needs to have a self-locking capability to prevent the lifting table from automatically descending or the electric bed from automatically returning. At present, most of the self-locking function of the linear actuator is realized by a braking torsion spring, and the braking torsion spring is driven to be tightly held by utilizing the reverse rotation of a rotating screw rod so as to generate a braking force.
[ summary of the invention ]
The present invention is directed to a motor self-locking device for a linear actuator and a linear actuator, which overcome the disadvantages of the prior art and can increase the self-locking capability of the linear actuator.
The technical scheme adopted by the invention is as follows:
the motor self-locking device of the linear actuator is sleeved on a motor output shaft and comprises an outer ring member and a cylinder, wherein the outer ring member is sleeved outside the motor output shaft, at least one deflection groove is formed in one side, facing the motor output shaft, of the outer ring member, the cylinder is arranged in the deflection groove, the radial distance of the deflection groove is gradually reduced along the reverse direction of the motor output shaft, and when the motor output shaft rotates towards the reverse direction, the cylinder is driven to move towards one end with the small radial distance, so that the cylinder and the outer ring member form interference fit.
The invention has the following beneficial effects:
in the invention, the motor self-locking device is arranged on the motor, the design does not need to change the internal structure of the original linear actuator, only the self-locking device needs to be additionally arranged on the motor, the changed input cost is lower, and the installation structure is suitable for linear actuators of various specifications.
The radial distance of the deflection grooves is gradually reduced along the reverse direction of the motor output shaft, when the motor output shaft has a reverse trend, the cylinder can move towards one end with a small radial distance, when the cylinder moves to the cylinder and the deflection grooves to finally realize interference fit, the cylinder can not move continuously, and the cylinder, the outer ring member and the motor output shaft are mutually extruded and even died, so that the motor output shaft is forced to bear reverse resistance. According to the design, when the motor is used as active output to rotate reversely, the torsion of the motor is enough to overcome the reverse rotation resistance, so that the motor can normally rotate reversely, and under the condition that the motor does not work, if the output shaft of the motor generates a reverse rotation trend due to external force factors, the external force is often not enough to overcome the reverse rotation resistance, so that the linear actuator can realize self-locking, and the self-locking force is relatively rigid, larger and better in self-locking stability compared with the flexible self-locking force generated by the traditional torsion spring structure because the resistance generated by mutual extrusion among the cylinder, the outer ring member and the output shaft of the motor is relied on.
Preferably, one of the cylindrical body and the outer ring member is an elastic body, and the other is a hard body.
Preferably, the outer ring member includes a first outer ring, and the deflection groove is formed between an inner side wall of the first outer ring and an outer side wall of the motor output shaft.
Preferably, a plurality of first grooves are circumferentially arranged on the inner side wall of the first outer ring at intervals, the cylinder is accommodated between the inner wall of the first groove and the outer side wall of the motor output shaft, and the radial distance between the inner wall of the first groove and the motor output shaft is gradually reduced along the reverse direction of the motor output shaft.
Preferably, the cylinder is an elastic body, the first outer ring is a hard body, the motor comprises a motor shell, a motor output shaft extends out of the motor shell, and the first outer ring is mounted at the end of the motor shell.
Preferably, the outer ring member comprises a second outer ring and a sleeve member, the sleeve member is sleeved on the output shaft of the motor, the second outer ring is sleeved outside the sleeve member, and the deflection groove is formed between the second outer ring and the sleeve member.
Preferably, a plurality of second grooves are circumferentially formed in the outer side wall of the shaft sleeve, the second outer ring is a circular ring, the cylinder is accommodated between the second grooves and the second outer ring, and the radial distance between the circumferential side wall of the second grooves and the circumferential side wall of the second outer ring is gradually reduced along the reverse direction of the motor output shaft.
Preferably, the shaft sleeve is a circular ring, the inner side wall of the second outer ring is provided with a third groove, and the radial distance between the circumferential side wall of the third groove and the circumferential side wall of the shaft sleeve is gradually reduced along the reverse rotation direction of the motor output shaft.
Preferably, the cylinder is an elastic body, the second outer ring is a hard body, the motor comprises a motor shell, a motor output shaft extends out of the motor shell, and the second outer ring is mounted at the end part of the motor shell.
In addition, the invention also discloses a linear actuator which comprises an inner tube, an outer tube, a rotating screw rod, a transmission nut and a motor, wherein the motor drives the rotating screw rod to rotate, the transmission nut is driven to axially move when the rotating screw rod rotates, the transmission nut moves to drive the inner tube and the outer tube to relatively extend and retract, and the motor is provided with the motor self-locking device in any scheme.
These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.
[ description of the drawings ]
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural diagram of a linear actuator according to an embodiment of the present invention;
FIG. 2 is an exploded view of a linear actuator according to one embodiment of the present invention;
FIG. 3 is a schematic view of an internal structure of the self-locking device after the self-locking device is assembled according to the first embodiment of the present invention;
FIG. 4 is a schematic top view of a self-locking device according to a first embodiment of the present invention;
FIG. 5 is an exploded view of the self-locking device according to the second embodiment of the present invention;
FIG. 6 is a schematic view of the internal structure of the self-locking device after the self-locking device is assembled according to the second embodiment of the present invention;
fig. 7 is a schematic top view of a self-locking device according to a second embodiment of the invention.
[ detailed description ] embodiments
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
In the following description, the terms "inside", "outside", "upper", "lower", "left", "right", and the like, which indicate orientations or positional relationships, are used for convenience in describing embodiments and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Example one
As shown in fig. 1 to 4, an application of the motor self-locking device 100 to a linear actuator is shown, the linear actuator has various types, such as a lifting column, an electric push rod, and the like, and the self-locking device 100 of the embodiment is specifically applied to an electric push rod.
The motor self-locking device 100 of this embodiment is sleeved on the motor output shaft 10, the motor self-locking device 100 includes an outer ring member and a cylinder 2, the outer ring member is sleeved outside the motor output shaft 10, it should be noted that the outer ring member in this embodiment is only a general term, the outer ring member may be a single component or may be composed of multiple components, in this embodiment, the outer ring member is preferably a single component, at least one deflection groove is formed on the outer ring member toward the motor output shaft 10 side, the cylinder 2 is arranged in each deflection groove, the radial distance of the deflection grooves is gradually reduced along the reverse direction of the motor output shaft 10, when the cylinder 2 is located at the end with the larger radial distance of the deflection grooves, the cylinders 2 theoretically contact with each other in the deflection grooves and do not generate acting force, that is, the cylinders 2 are in a relatively free state, when the motor output shaft 10 rotates in a reverse direction or has a reverse trend, the cylinder 2 is driven to move towards one end with a small radial distance, so that the cylinder 2 and the outer ring component form interference fit.
It should be noted, however, that when the cylindrical body 2 is located at a larger radial distance from the deflection slots, although it is theoretically best that the cylindrical body 2 and the deflection slots have a zero-zero relationship, because of practical machining errors and assembly errors, a small amount of clearance fit and a small amount of interference fit are allowed between the cylindrical body 2 and the deflection slots, and the normal operation of the motor 1 is not greatly affected. However, when the motor 1 is reversed, the interference between the cylindrical body 2 and the deflection slots must be increased and must be greater than the interference when the cylindrical body 2 is located at the end of the deflection slots having the larger radial distance.
In this embodiment, since the motor self-locking device 100 is installed on the motor 1, the design does not need to change the internal structure of the original linear actuator, and only the motor self-locking device 100 needs to be installed on the motor 1, the changed input cost is lower, and the installation structure is applicable to linear actuators of various specifications, because all the linear actuators all use the motor 1, the motor self-locking device 100 can be applied to a plurality of linear actuators.
Secondly, in the motor self-locking device 100 in this embodiment, the structure of the device adopts the matching change between the cylinder 2 and the deflection slot to realize locking and unlocking, because the deflection slot in this embodiment has a radial distance that gradually decreases along the reverse direction of the motor output shaft 10, when the motor output shaft 10 has a reverse trend, the cylinder 2 will move towards one end with a small radial distance, when the cylinder 2 and the deflection slot are finally in interference fit, the cylinder 2 cannot move continuously, and at this time, the cylinder 2, the outer ring member and the motor output shaft 10 are squeezed or even died mutually, so that the motor output shaft 10 is forced to receive reverse resistance. Such design, when motor 1 reverses as the initiative output, the torsion of motor 1 is enough to overcome this reversal resistance, thereby can let motor 1 normally reverse the operation, and under motor 1 was the inoperative condition, if when letting motor output shaft 10 produce the reversal trend because of external force factor, often these external forces are not enough to overcome this reversal resistance, thereby make linear actuator realize the auto-lock, and this kind of auto-lock power, because it is the resistance that cylinder 2, outer lane component, the conflict produced each other between motor output shaft 10 three, compared with the flexible auto-lock power that traditional torsional spring structure produced, this embodiment auto-lock power is the auto-lock power of relative rigidity, the auto-lock power is bigger, the stability of auto-lock is better.
In order to provide a greater self-locking force, the cylinder 2 and the outer ring member are made of an elastomer and a hard body. The purpose of this design is that when the interference fit occurs between the cylinder 2 and the outer ring member, the portion of the elastic body can be compressed to generate elastic deformation, so that the interference is increased, and the resistance is increased after the interference is increased, so that the self-locking force is finally improved. In the present embodiment, it is preferable that the cylindrical body 2 is an elastic body and the outer ring member is a hard body. Of course, in other embodiments, the cylindrical body 2 may be a hard body and the outer ring member may be an elastic body.
In this embodiment, since the outer ring member is a single component, specifically, the outer ring member includes the first outer ring 31, and the deflection groove is formed between the inner side wall of the first outer ring 31 and the outer side wall of the motor output shaft 10, when the motor output shaft 10 rotates reversely or tends to rotate reversely, the outer side wall of the motor output shaft 10 directly drives the cylinder 2 to move.
Specifically, a plurality of first grooves 311, specifically 3 first grooves 311, are circumferentially arranged at intervals on the inner side wall of the first outer ring 31, the three first grooves 311 are circumferentially and uniformly arranged, the cylinder 2 is accommodated between the inner wall of the first groove 311 and the outer side wall of the motor output shaft 10, equivalently, a deflection groove is formed between the inner wall of the first groove 311 and the motor output shaft 10, and the radial distance between the inner wall of the first groove 311 and the motor output shaft 10 is gradually reduced along the reverse rotation direction of the motor output shaft 10.
Specifically, as shown in fig. 4, the position shown in fig. 4 is a position where the cylindrical body 2 is located at the end of the larger radial distance of the deflection slot, and at this time, the inner walls of the cylindrical body 2 and the first recess 311 and the peripheral side wall of the motor output shaft 10 are in a state of substantially just contacting, and at this time, if the motor output shaft 10 rotates in the forward direction (i.e., clockwise in the drawing), the cylindrical body 2 does not substantially generate resistance to the motor output shaft 10, or allows a certain interference fit, but when the motor output shaft 10 rotates in the reverse direction or has a movement tendency of rotating in the reverse direction (counterclockwise in the drawing is reverse rotation). At this time, the motor output shaft 10 can drive the cylinder 2 to move counterclockwise, taking the cylinder 2 at the bottom as an example, the radial distance of the deflection slot in the initial state is D1, the radial distance of the deflection slot towards the counterclockwise side is D2, obviously, D2 is less than D1, if the diameter of the cylinder 2 is D0, D0 is theoretically just equal to D1, but is obviously greater than D2, when the cylinder 2 moves to D2, the cylinder 2 and the deflection slot generate interference fit, so that the cylinder 2, the first outer ring 31 and the motor output shaft 10 are mutually extruded or even died, thereby generating resistance on the motor output shaft 10 to prevent the linear actuator from being reset due to external force, and the extension and retraction of the linear actuator can only be realized by the motor 1.
In addition, for the integral installation, it is also described above that the first outer ring 31 is preferably provided as a hard member and the cylindrical body 2 is provided as an elastic body in the present embodiment. Since the first outer ring 31 member of the present embodiment is directly mounted on the end of the housing of the motor 1, and the motor output shaft 10 extends out of the housing of the motor 1, the first outer ring 31 member is made of a hard material, and obviously, the stability after mounting is better. In addition, an end cap 4 is disposed on the top of the first outer ring 31 to enclose the cylindrical body 2 within the first outer ring 31.
Example two
As shown in fig. 5 to 7, the present embodiment is different from the first embodiment in that the structure of the outer ring member of the present embodiment is different, the outer ring member of the first embodiment is a single component, and the outer ring member of the present embodiment includes two parts, that is, the outer ring member includes a second outer ring 32 and a sleeve member 33, the sleeve member 33 is sleeved on the output shaft 10 of the motor, the second outer ring 32 is sleeved on the sleeve member 33, and the deflection groove is formed between the second outer ring 32 and the sleeve member 33.
The shaft sleeve member 33 in this embodiment is designed like a spline, that is, the outer side wall of the shaft sleeve member 33 is circumferentially provided with a plurality of second grooves 331, the second outer ring 32 is a circular ring, the cylindrical body 2 is accommodated between the second grooves 331 and the second outer ring 32, and the radial distance between the circumferential side wall of the second grooves 331 and the circumferential side wall of the second outer ring 32 gradually decreases along the reverse direction of the motor output shaft 10.
Referring specifically to fig. 7, the inner sidewall 3311 of the second groove 331 is sloped such that the radial distance between the deflection slots tends to decrease, and similarly, when the motor output shaft 10 rotates in the reverse direction (i.e., counterclockwise in the figure), the sleeve member 33 drives the cylinder 2 to move counterclockwise, the interference between the cylinder 2 and the deflection slots increases, and in this embodiment, it is also preferable that the cylinder 2 is an elastic body, and in addition, the second outer ring 32 and the sleeve member 33 are preferably hard bodies. Since this embodiment is also mounted at the end of the housing of the electrical machine 1, the second outer ring 32 serves as a base for mounting, preferably as a hard body.
In other embodiments, the cylinder 2 may be a hard body, and at least one of the second outer ring 32 and the sleeve 33 may be an elastic body.
In addition, it should be noted that, in the present embodiment, the second groove is disposed on the shaft sleeve, and a person skilled in the art may also easily think, through the idea of the present embodiment, that the shaft sleeve may be designed as a circular ring, and a third groove is disposed on the inner side wall of the second outer ring, and a radial distance between a circumferential side wall of the third groove and a circumferential side wall of the shaft sleeve is gradually reduced along the reverse rotation direction of the output shaft of the motor, and this embodiment also falls within the protection scope of the present invention.
EXAMPLE III
As described above, referring to fig. 1 and fig. 2, the linear actuator of the present embodiment is preferably an electric push rod, the present embodiment includes an inner tube 51, an outer tube 52, a rotating screw 61, a transmission nut 62, and a motor 1, the motor 1 drives the rotating screw 61 to rotate, the rotating screw 61 drives the transmission nut 62 to move axially when rotating, the transmission nut 62 moves to drive the inner tube 51 and the outer tube 52 to expand and contract relatively, wherein the motor 1 is mounted with the motor self-locking device 100 as in the first embodiment or the second embodiment or an embodiment equivalent thereto.
Other configurations of the power putter are not described herein in any greater detail since they are well known in the art.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims (10)

1. The motor self-locking device of the linear actuator is characterized in that the motor self-locking device is sleeved on a motor output shaft and comprises an outer ring member and a cylinder, the outer ring member is sleeved outside the motor output shaft, at least one deflection groove is formed in the outer ring member towards one side of the motor output shaft, the cylinder is arranged in the deflection groove, the radial distance of the deflection groove is gradually reduced along the reverse direction of the motor output shaft, and when the motor output shaft rotates towards the reverse direction, the cylinder is driven to move towards one end with the small radial distance, so that the cylinder and the outer ring member form interference fit.
2. The electromechanical self-locking device of claim 1, wherein one of the cylindrical body and the outer ring member is an elastomer and the other is a hard body.
3. The motor self-locking device of claim 1, wherein the outer race member comprises a first outer race, and the deflection groove is formed between an inner side wall of the first outer race and an outer side wall of a motor output shaft.
4. The motor self-locking device according to claim 3, wherein a plurality of first grooves are circumferentially spaced on the inner side wall of the first outer ring, the cylinder is accommodated between the inner wall of the first groove and the outer side wall of the motor output shaft, and the radial distance between the inner wall of the first groove and the motor output shaft is gradually reduced along the reverse direction of the motor output shaft.
5. The motor self-locking device of claim 3, wherein the cylindrical body is an elastic body, the first outer ring is a hard body, the motor includes a motor housing, the motor output shaft extends out of the motor housing, and the first outer ring is mounted at an end of the motor housing.
6. The motor self-locking device of claim 1, wherein the outer race member comprises a second outer race and a sleeve member, the sleeve member is sleeved on the motor output shaft, the second outer race is sleeved on the sleeve member, and the deflection groove is formed between the second outer race and the sleeve member.
7. The motor self-locking device according to claim 5, wherein a plurality of second grooves are circumferentially formed on an outer side wall of the shaft sleeve, the second outer ring is a circular ring, the cylinder is accommodated between the second grooves and the second outer ring, and a radial distance between a circumferential side wall of the second grooves and a circumferential side wall of the second outer ring is gradually reduced along a reverse direction of the motor output shaft.
8. The motor self-locking device according to claim 5, wherein the shaft sleeve is a circular ring, the inner side wall of the second outer ring is provided with a third groove, and a radial distance between a circumferential side wall of the third groove and the circumferential side wall of the shaft sleeve is gradually reduced along a reverse direction of the motor output shaft.
9. The motor self-locking device of claim 5, wherein the cylindrical body is an elastic body, the second outer ring is a hard body, the motor includes a motor housing, the motor output shaft extends out of the motor housing, and the second outer ring is mounted at an end of the motor housing.
10. A linear actuator, comprising an inner tube, an outer tube, a rotary screw rod, a transmission nut and a motor, wherein the motor drives the rotary screw rod to rotate, the rotary screw rod drives the transmission nut to move axially when rotating, and the transmission nut moves to drive the inner tube and the outer tube to relatively extend and retract, and the motor is provided with a motor self-locking device as claimed in any one of claims 1 to 9.
CN201910958232.0A 2019-10-10 2019-10-10 Motor self-locking device of linear actuator and linear actuator Pending CN110729847A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201910958232.0A CN110729847A (en) 2019-10-10 2019-10-10 Motor self-locking device of linear actuator and linear actuator
CN202010512598.8A CN111884418A (en) 2019-10-10 2019-10-10 Motor self-locking device of linear actuator and linear actuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910958232.0A CN110729847A (en) 2019-10-10 2019-10-10 Motor self-locking device of linear actuator and linear actuator

Related Child Applications (1)

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CN202010512598.8A Division CN111884418A (en) 2019-10-10 2019-10-10 Motor self-locking device of linear actuator and linear actuator

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CN201910958232.0A Pending CN110729847A (en) 2019-10-10 2019-10-10 Motor self-locking device of linear actuator and linear actuator
CN202010512598.8A Pending CN111884418A (en) 2019-10-10 2019-10-10 Motor self-locking device of linear actuator and linear actuator

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