CN215861421U - Motor with self-locking function and linear actuator - Google Patents

Abstract

The motor with the self-locking function comprises an end cover and a driving shaft, a friction ring is sleeved on the driving shaft, a notch is formed in the friction ring, a limiting part is arranged on the periphery of the friction ring, and the end cover is matched with the limiting part so that the friction ring can tightly hold the driving shaft when the driving shaft rotates along a first direction.

Description

Motor with self-locking function and linear actuator

[ technical field ] A method for producing a semiconductor device

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

[ background of the utility model ]

The driver is a component capable of generating power, outputs rotational power through an output shaft, and is widely applied to various devices. In order to guarantee the stability of equipment, need avoid equipment can change under the exogenic action, and the output shaft can't appear rotating and influence equipment stability under the exogenic action promptly, consequently need carry out the auto-lock to the output shaft. The friction block is arranged on the output shaft in an interference mode, the other friction part is arranged outside the friction block, and the friction force generated between the friction block and the output shaft when the output shaft rotates or the friction force generated between the friction block and the friction part is driven by the output shaft to realize braking.

[ Utility model ] content

The utility model aims to solve the technical problem of overcoming the defects of the prior art and provides the motor with the self-locking function, wherein the motor has the self-locking performance, better stability, low noise in the operation process and good user experience.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the motor with self-locking function, the motor includes end cover and drive shaft, suit friction ring on the drive shaft, be equipped with the breach on the friction ring, the periphery of friction ring is equipped with spacing portion, the end cover with spacing portion cooperation, so that the friction ring is in the drive shaft is held the drive shaft tightly when rotating along the first direction.

On the basis of the scheme, the limiting parts are at least two, and the limiting parts are arranged on two sides of the notch, so that the friction ring can hold the driving shaft tightly when the driving shaft rotates along a second direction opposite to the first direction.

On the basis of the scheme, at least one limiting part is arranged, the limiting part is arranged on one of the two sides of the notch, and the free end is arranged on the other side of the notch.

On the basis of the scheme, the periphery of the friction ring is provided with a convex rib with the width the same as that of the friction ring, and the convex rib is arranged at the free end and the length of the convex rib is not more than half of the length of the friction ring.

On the basis of the scheme, the thickness of the friction ring is gradually reduced from two ends inwards.

On the basis of the scheme, the limiting part is a bulge protruding out of the periphery of the friction ring, and the end cover is provided with a clamping part matched with the bulge.

On the basis of the scheme, the notch is provided with connecting pieces which are respectively connected with two ends of the friction ring.

On the basis of the scheme, the connecting piece is a spring; or the connecting piece is an elastic sheet made of elastic material; or the connecting piece is a rigid piece penetrating through two ends of the friction ring; or, the connecting piece and the friction ring are integrally formed, and the thickness of the connecting piece is smaller than that of the friction ring.

On the basis of the scheme, the protrusion is a blocking handle, the clamping portion is a clamping groove, and the blocking handle is clamped into the clamping groove.

On the basis of the scheme, a limiting sleeve is arranged in the end cover, the clamping part is arranged on the limiting sleeve, and the friction ring is clamped in the limiting sleeve; or, the position limiting part is sleeved with a position clamping sleeve, and the position clamping sleeve is matched with the position clamping part.

On the basis of the scheme, the limiting part is a groove arranged on the periphery of the friction ring, and the end cover is provided with a clamping block matched with the groove.

On the basis of the scheme, the circle center of the friction ring deviates from the axis line of the driving shaft.

The linear actuator comprises the motor with the self-locking function.

On the basis of the scheme, the linear actuator comprises an upright column, a screw rod assembly arranged in the upright column and a worm wheel used for driving the screw rod assembly, the driving shaft is a worm matched with the worm wheel, and the hub of the worm wheel is also provided with the friction ring.

The utility model has the beneficial effects that:

the utility model discloses a self-locking device, which comprises a friction ring sleeved on a driving shaft, wherein the friction ring is matched with an end cover through a limiting part, used for circumferential limiting of the friction ring, the gap arranged on the friction ring allows the friction ring to have certain deformation or have deformation tendency in the radial direction, when the driving shaft rotates along the first direction, the friction force between the driving shaft and the friction ring can drive the friction ring to rotate towards the first direction, but the friction ring is limited in the circumferential direction, so that the friction force drives one end of the gap of the friction ring to approach the other end, the friction ring tightly embraces the driving shaft, the acting force between the friction ring and the driving shaft is enhanced, thereby generating larger friction force to act on the driving shaft to realize the braking of the driving shaft, after the friction ring holds the driving shaft tightly, when the motor stops running, the friction ring still holds the driving shaft tightly, so that the driving shaft is difficult to rotate under the action of external force;

in the braking process, the friction ring can be deformed under the driving of the driving shaft, so that the inner diameter is reduced, the distance between two ends of the gap is reduced, and the driving shaft is tightly held; or the inner diameter of the friction ring is not changed, but under the action of the driving shaft, the friction ring is more tightly attached to the driving shaft, so that the relative acting force between the friction ring and the driving shaft can be increased;

when the self-locking device is arranged, the self-locking device with different braking forces can be obtained by changing the number of the limiting parts and adjusting the positions of the limiting parts so as to be matched with motors of different types and specifications;

after having set up the breach on the friction ring for can be appropriate in the friction ring assembling process come the suit to the drive shaft through deformation, consequently can not harm the surface of drive shaft in the assembling process, the surface of drive shaft also can not have the burr, thereby can not produce the noise that influences the user and use between friction ring and drive shaft in braking process, user's use experience has been improved, and the dismouting process when the friction ring is comparatively convenient, appear wearing and tearing when the friction ring and lead to behind the braking force decline, it is also comparatively convenient to replace.

Furthermore, spacing portion is equipped with two at least, the breach both sides all are equipped with spacing portion, so that the friction ring is in the drive shaft along with the drive shaft is held tightly when first direction opposite second direction rotates. It should be noted that the first direction and the second direction are two different directions, that is, the driving shaft rotates forward and backward; the limiting part can be used for circumferentially limiting the friction ring, the position of the limiting part is arranged on the friction ring, the position change trend of the friction ring is limited by the end cover, when the driving shaft rotates in the first direction, one end of the notch is limited, and the other end of the notch can be driven by the driving shaft to move in the first direction, so that the driving shaft can be tightly held (the movement of the end part of the friction ring can be explained, the end part of the friction ring can be deformed in one direction, or the friction ring can not be deformed but has the trend of being deformed in one direction); when the drive shaft rotates in the second direction, the condition at the both ends of breach position is just in time opposite, the one end that originally was restricted can move towards the second direction, the other end has then received spacingly, the drive shaft can be hugged closely to the friction ring equally, the two-way auto-lock of self-lock device to the drive shaft has been realized, thereby in the drive shaft rotation process, self-lock device can apply frictional force to the drive shaft all the time, so that the motor can bring to rest sooner, improve motor control accuracy, possess the auto-lock ability again when quiescent condition, keep the stability of motor.

Furthermore, the limiting part is provided with at least one, the limiting part is arranged on one of two sides of the notch, and the other side of the notch is a free end. The position department that has set up spacing portion, can not change along with the drive shaft rotates and appear, the restriction of spacing portion has been lacked to free end department, when the drive shaft rotates in the first direction, the drive free end moves on the first direction, thereby it produces braking force to hold the drive shaft tightly, when the drive shaft rotates in the second direction, the drive free end moves in the second direction, the relative effort between friction ring and the drive shaft has been reduced, frictional force between the two reduces promptly, the power of motor loss is lower, the setting can realize the one-way auto-lock to the drive shaft like this.

Further, the periphery of friction ring is equipped with the protruding muscle that the width is the same with friction ring, protruding muscle sets up free end department and its length is no longer than half of friction ring length. One end of the friction ring is provided with a limiting part to limit the end, and the free end is provided with a convex rib to increase the thickness of the friction ring, so that the strength of the friction ring is improved, the acting force between the friction ring and the driving shaft is improved when the motor is in a static state, and the thickness of the friction ring of the other part is thinner, so that the free end can act under the driving of the driving shaft more easily, and the self-locking device can generate larger braking force during braking.

Further, the thickness of the friction ring is gradually reduced from the two ends to the inside. The thickness at friction ring both ends is the biggest, and therefore the relative effort between free end and the friction ring is also great, and the thickness of the middle section part of friction ring is little, consequently appears deformation more easily, and the both ends of friction ring also move under the drive of drive shaft more easily, can produce bigger brake force, if self-lock device carries out one-way auto-lock to the drive shaft, and the motor is when normal operating, and the power of loss also can be still less.

Furthermore, the notch is provided with connecting pieces which are respectively connected with two ends of the friction ring. The connecting piece can keep friction ring's stability, and on the drive shaft was installed to the friction ring, can be radially spacing by the connecting piece, avoid the friction ring to drop from the drive shaft at the in-process of assembly end cover.

Further, the connecting piece is a spring; or the connecting piece is an elastic sheet made of elastic material; or the connecting piece is a rigid piece penetrating through two ends of the friction ring; or, the connecting piece and the friction ring are integrally formed, and the thickness of the connecting piece is smaller than that of the friction ring. The connecting piece can be in various different types of structures, and the spring has elasticity and cannot influence the actions of the two ends of the friction ring; the rigid part penetrates through the friction ring and is not in fixed relation with the friction ring, so that the actions of the two ends of the friction ring are not influenced; the friction ring formed integrally with the friction ring is thin, so that the actions of the two ends of the friction ring are not influenced.

Furthermore, the limiting part is a protrusion protruding out of the periphery of the friction ring, and the end cover is provided with a clamping part matched with the protrusion. The protruding position that can restrict behind the screens portion changes of protruding card income, consequently the friction ring can't rotate along with the drive shaft is synchronous to protruding only need block can realize rotating spacing in the screens portion back, consequently do not adopt interference fit's mode between screens portion and the arch, can make things convenient for the installation of friction ring.

Furthermore, the limiting part is a groove arranged on the periphery of the friction ring, and a clamping block matched with the groove is arranged on the end cover. After fixture block and recess cooperation, alright in order to restrict the rotation of friction ring in circumference to the realization is to the auto-lock of drive shaft, fixture block protrusion in the inner wall of end cover, can be through the thickness that increases the fixture block, make the friction ring and the drive shaft interference fit of groove position department, in order to maintain the stable in structure of friction ring here, and can not influence the deformation of other position friction rings.

Further, the center of the friction ring is deviated from the axis of the driving shaft. So, friction ring suit back in the drive shaft, there is the clearance between partial friction ring and the drive shaft, this partial friction ring is because of lacking the support of drive shaft, deformation appears more easily, if the friction ring is set up to be used for realizing the one-way auto-lock to the drive shaft, when needs braking, the drive shaft drives the deformation of friction ring, and the deformation volume is great, can produce great auto-lock power, when normal rotation, the drive shaft drives the reverse deformation of friction ring, reduce the area of contact of friction ring and drive shaft, the very big degree reduces the influence of frictional force to drive shaft pivoted.

The utility model also discloses a linear actuator, which is generally applicable to lifting devices such as lifting tables and lifting beds, wherein the linear actuator adopts the driver and then is configured in the lifting device, when the lifting device bears a large load, the situation that the lifting device retracts due to the fact that the driving shaft does not rotate reversely under the self-locking of the driver is avoided, and the stability of the equipment is kept.

Further, the linear actuator comprises an upright post, a screw rod assembly arranged in the upright post, and a worm wheel used for driving the screw rod assembly, the driving shaft is a worm matched with the worm wheel, and the hub of the worm wheel is also provided with the friction ring. After the friction ring is arranged on the hub of the worm wheel, the worm wheel can be self-locked through the friction ring, and the self-locking performance of the linear actuator is improved through the matching of the friction ring and the driver.

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 utility model is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic structural diagram of a driver according to an embodiment of the present invention;

FIG. 2 is an exploded view of a driver in an embodiment of the present invention;

FIG. 3 is an enlarged schematic view at A in FIG. 2;

FIG. 4 is a schematic view of the engagement structure of the friction ring and the end cap according to the embodiment of the present invention 1;

FIG. 5 is a schematic structural diagram A of a friction ring according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram B of a friction ring according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram C of a friction ring according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram D of a friction ring in an embodiment of the present invention;

FIG. 9 is a schematic structural view E of a friction ring according to an embodiment of the present invention;

FIG. 10 is a schematic structural view F of a friction ring according to an embodiment of the present invention;

FIG. 11 is a schematic structural diagram G of a friction ring in an embodiment of the present invention;

FIG. 12 is a schematic structural view H of a friction ring according to an embodiment of the present invention;

FIG. 13 is a schematic structural diagram I of a friction ring according to an embodiment of the present invention;

FIG. 14 is a schematic structural view J of a friction ring according to an embodiment of the present invention;

FIG. 15 is a schematic structural view K of a friction ring according to an embodiment of the present invention;

FIG. 16 is a schematic view of the engagement structure of the friction ring and the end cap according to the embodiment of the present invention, as shown in FIG. 2;

FIG. 17 is a schematic structural view L of a friction ring according to an embodiment of the present invention;

FIG. 18 is a schematic structural diagram M of a friction ring according to an embodiment of the present invention;

FIG. 19 is a schematic structural diagram of a friction ring according to an embodiment of the present invention;

fig. 20 is an exploded view of a driver in a linear actuator in an embodiment of the present invention.

Reference numerals:

the end cover 100, the driving shaft 110, the clamping part 120, the limiting sleeve 130 and the clamping block 140;

the friction ring 200, the notch 210, the limiting part 220, the free end 230, the convex rib 240 and the connecting piece 250; an outer race 300, an inner race 310;

a worm gear 400.

[ 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 description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

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

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

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

Referring to fig. 1 to 5, the embodiment of the utility model discloses a motor with a self-locking function, the motor includes an end cover 100 and a driving shaft 110, a friction ring 200 is sleeved on the driving shaft 110, a notch 210 is arranged on the friction ring 200, a limiting portion 220 is arranged on the periphery of the friction ring 200, and the end cover 100 is matched with the limiting portion 220, so that the friction ring 200 embraces the driving shaft 110 when the driving shaft 110 rotates along a first direction.

The self-locking device disclosed by the utility model comprises a friction ring 200 sleeved on a driving shaft 110, wherein the friction ring 200 is matched with an end cover 100 through a limiting part 220 and used for circumferentially limiting the friction ring 200, two end parts are formed on the friction ring 200 through a notch 210 on the friction ring 200, the end parts of the friction ring 200 are allowed to generate certain deformation or have a deformation trend in the radial direction, when the driving shaft 110 rotates along a first direction, the friction force between the driving shaft 110 and the friction ring 200 can drive the friction ring 200 to rotate towards the first direction, but the friction ring 200 is circumferentially limited, so that the friction force can drive one of the two end parts of the friction ring 200 to approach the other end part, the friction ring 200 tightly embraces the driving shaft 110, the acting force between the two parts is enhanced, and thus a larger friction force can be generated to act on the driving shaft 110 to realize the braking of the driving shaft 110, after the friction ring 200 tightly embraces the driving shaft 110, the motor stops running, and at the moment, the friction ring 200 still tightly embraces the driving shaft 110, so that the driving shaft 110 is difficult to rotate under the action of external force;

in the braking process, the friction ring 200 can be deformed under the driving of the driving shaft 110, so that the inner diameter is reduced, the distance between the two end parts is reduced, and the driving shaft 110 is tightly held; alternatively, the inner diameter of friction ring 200 does not change, but friction ring 200 is forced closer to drive shaft 110 by drive shaft 110, which also increases the relative force between the two.

After notch 210 has been set up on friction ring 200, make friction ring 200 assembly in-process can be suitable come the suit to drive shaft 110 through deformation on, consequently can not harm the surface of drive shaft 110 in the assembly process, the surface of drive shaft 110 also can not have the burr, thereby can not produce the noise that influences user's use between friction ring 200 and drive shaft 110 in braking process, user's use experience has been improved, and the dismouting process when friction ring 200 is comparatively convenient, wear and tear appears and lead to behind the braking force decline when friction ring 200, it is also comparatively convenient to replace.

Preferably, friction ring 200 is generally C-shaped with a gap 210 formed between its ends. Referring to fig. 6, friction ring 200 may be formed in the shape of a torsion spring, and may be operated by driving of driving shaft 110 to brake driving shaft 110.

The friction ring 200 is preferably made of plastic with high rigidity, good bearing performance, high temperature resistance and high strength, so that the friction coefficient of the friction ring 200 is not reduced due to the rise of the temperature of the friction ring 200 during working, stable self-locking performance is kept, the friction ring 200 also has good wear resistance and long service life.

When the self-locking device is arranged, the self-locking device with different braking forces can be obtained by changing the number of the limiting parts 220 and adjusting the positions of the limiting parts 220 so as to be matched with motors of different types and specifications. The greater the number of the stopper portions 220, the greater the restraining ability of the friction ring 200, and the less the friction ring 200 is affected by the drive shaft 110. As shown in fig. 5, the friction ring 200 may be enhanced in stability by providing a plurality of stoppers 220 at partial positions of the friction ring 200. Because the friction ring 200 is provided with the position limiting part 220, the friction ring 200 of the position limiting part 220 is limited after the position limiting part 220 is matched with the end cover 100, and the self-locking performance of the friction ring 200 to the driving shaft 110 can be changed by designing and adjusting the position of the position limiting part 220 on the friction ring 200.

Referring to fig. 7, based on the above embodiment, in another embodiment of the present invention, the friction ring 200 is capable of bi-directionally self-locking the driving shaft 110.

Specifically, at least two limiting portions 220 are provided, and the two sides of the notch 210 are provided with the limiting portions 220, so that the friction ring 200 can clasp the driving shaft 110 when the driving shaft 110 rotates along a second direction opposite to the first direction.

The first direction and the second direction are two different directions, i.e. the forward and reverse rotation of the driving shaft 110.

Preferably, the engagement between the position-limiting portion 220 and the engagement portion of the end cap 100 is a clearance fit, which facilitates the assembly of the friction ring 200 in the end cap 100, and the engagement portion of the end cap 100 is mainly used for limiting the rotation of the friction ring 200, so that the friction ring 200 is allowed to have a certain rotation angle, when the driving shaft 110 rotates, the friction ring 200 can be driven to rotate synchronously, and after the friction ring 200 rotates by a certain angle, the position-limiting portion 220 abuts against the engagement portion of the end cap 100 to be stopped, so as to limit the rotation of the friction ring 200.

The limiting parts 220 may be disposed on both ends of the friction ring 200, or disposed at positions on the friction ring 200 near the ends, the limiting parts 220 may be used to circumferentially limit the friction ring 200, and the positions of the limiting parts 220 on the friction ring 200 are limited by the end cap 100.

When the driving shaft 110 rotates in the first direction, one end of the friction ring 200 is limited, and the other end of the friction ring can be driven by the driving shaft 110 to move in the first direction, so that the driving shaft 110 can be held tightly; when the driving shaft 110 rotates in the second direction, the two ends of the friction ring 200 are opposite, the originally limited one end can move towards the second direction, the other end is limited, the friction ring 200 can also tightly hold the driving shaft 110, and the bidirectional self-locking of the self-locking device to the driving shaft 110 is realized, so that in the rotating process of the driving shaft 110, the self-locking device can always apply friction force to the driving shaft 110, the motor can stop running more quickly, the control precision of the motor is improved, the self-locking device has self-locking capability in a static state, and the stability of the motor is kept.

In the above description, the driving operation of the end portion of the friction ring 200 by the driving shaft 110 means that the end portion is deformed in the rotation direction of the driving shaft 110 by the driving shaft 110, the length of the notch 210 is increased or decreased (the length of the notch 210 is the length in the circumferential direction of the friction ring 200), and the relative force between the friction ring 200 and the driving shaft 110 is increased or decreased, or the end portion is influenced by the friction force of the driving shaft 110 and tends to be deformed in the rotation direction of the driving shaft 110, and although the length of the notch 210 is not changed, the relative force between the friction ring 200 and the driving shaft 110 can be increased or decreased.

Unlike the above-described embodiment, in another embodiment of the present invention, the friction ring 200 can achieve one-way self-locking of the driving shaft 110.

Referring to fig. 8, specifically, at least one limiting portion 220 is provided, one of two sides of the notch 210 is provided with the limiting portion 220, and the other side is a free end 230.

In the above embodiment, the limiting portion 220 is provided at one of the two ends of the friction ring 200, so that the free end 230 is not limited to move and is driven by the friction force between the driving shaft 110 and the friction ring 200 when the driving shaft 110 rotates.

When the driving shaft 110 normally rotates along the second direction, the free end 230 is driven to move towards the second direction, and the other end is limited by the limiting part 220 to keep the position unchanged, so that the relative acting force between the driving shaft 110 and the friction ring 200 is reduced, the friction force is reduced, the influence on the driving shaft 110 is small, and the power loss of the driver is reduced;

when the driving shaft 110 rotates along the first direction, the free end 230 is driven to move towards the first direction, and the other end is limited by the limiting part 220 to keep the position unchanged, so that the relative acting force between the driving shaft 110 and the friction ring 200 is increased, and the friction force acting on the driving shaft 110 is improved.

The thicker the thickness of the friction ring 200 is, the less deformation is likely to occur, in the scheme of one-way self-locking, the one-way self-locking performance can be improved by designing the thickness of the friction ring 200, referring to fig. 9, in another embodiment of the utility model, a protruding rib 240 with the same width as that of the friction ring 200 is arranged on the outer periphery of the friction ring 200 from the free end 230, and the length of the protruding rib 240 is not more than half of the length of the friction ring 200.

At two ends of the friction ring 200, one of the two ends is provided with a limiting part 220, the other end is a free end 230, and the periphery of the other end is provided with a convex rib 240, so that the friction ring 200 can realize one-way self-locking of the driving shaft 110. The width of the rib 240 is the same as that of the friction ring 200, so that the portion of the friction ring 200 where the rib 240 is provided is different from the other portion only in thickness, the acting force between the friction ring 200 with increased thickness and the driving shaft 110 is increased, and the friction ring 200 with the thinner thickness of the other portion is more easily deformed, so that the braking force generated during braking is larger, and the friction force generated during normal operation is relatively reduced, thereby further reducing the power consumed by the actuator.

In another embodiment of the present invention, unlike the previous embodiment, another construction of friction ring 200 is also provided.

Referring to fig. 10, the thickness of the friction ring 200 is gradually reduced from both ends to the inside, the thickness of both ends of the friction ring 200 is the largest, so the relative force between the ends and the friction ring 200 is also larger, and the thickness of the middle section of the friction ring 200 is small, so the deformation is more likely to occur, and the braking force generated during braking can be improved, and the friction force generated during normal operation can be reduced. Such a friction ring 200 is suitable for a one-way self-locking scheme of the self-locking device for the driving shaft 110, and is also suitable for a two-way self-locking scheme.

Different from the two embodiments, in another embodiment of the present invention, the center of the friction ring deviates from the axis of the driving shaft, so that after the friction ring is sleeved on the driving shaft, a gap exists between a part of the friction ring and the driving shaft, the part of the friction ring is more easily deformed due to lack of support of the driving shaft, if the friction ring is configured to realize unidirectional self-locking of the driving shaft, when braking is needed, the driving shaft drives the friction ring to deform to generate self-locking force to realize self-locking, when normal rotation is performed, the driving shaft drives the friction ring to reversely deform, the contact area between the friction ring and the driving shaft is reduced, and the influence of the friction force on the rotation of the driving shaft is greatly reduced.

Referring to fig. 11, in another embodiment of the present invention based on the above embodiment, the notches 210 are provided with connecting members 250 respectively connecting both ends of the friction ring 200.

The connecting member 250 can keep the friction ring 200 stable, and when the friction ring 200 is mounted on the driving shaft 110, the friction ring can be radially limited by the connecting member 250, so that the friction ring 200 is prevented from falling off the driving shaft 110 in the process of assembling the end cover 100.

If the self-locking device is a bidirectional self-locking device, the connecting member 250 may also be connected to the position-limiting portions 220 at both ends of the friction ring 200.

The connector 250 has a variety of configurations including, but not limited to, the following.

The connecting piece 250 can be a spring, two ends of the spring are respectively connected with two ends of the friction ring 200, the spring has elasticity, and can be pressed to deform in the radial direction and the axial direction, so that the actions at the two ends of the friction ring 200 cannot be realized, the spring can select a compression spring, the acting force in the direction of the notch 210 can be applied to the two ends of the friction ring 200, the braking force is increased, if the self-locking device is a one-way self-locking device, the spring can also select an extension spring, the acting force far away from the notch 210 can be applied to the two ends of the friction ring 200, and the power loss of the motor in normal operation is reduced.

The connecting piece can be a rigid piece, the rigid piece penetrates through two ends of the friction ring and is in clearance fit with the friction ring, and the rigid piece and the friction ring are not in fixed relation, so that actions at two ends of the friction ring cannot be influenced. The rigid part can be a short shaft, and a pin shaft is inserted in the radial direction of the short shaft, so that the axial displacement distance of the short shaft relative to the friction ring can be limited.

Referring to fig. 12 and 13, alternatively, the connecting member 250 is made of the same material as the friction ring 200 and is integrally formed with the friction ring 200, and the thickness of the connecting member 250 is smaller than that of the friction ring 200, so that a notch 210 is formed in the friction ring 200, and the thickness of the connecting member 250 is thinner, thereby not affecting the movement of the two ends of the friction ring 200. The connecting member 250 may be connected to the outer circumference of the friction ring 200 (as shown in fig. 12) or the inner circumference of the friction ring 200 (as shown in fig. 13), and the two connecting members 250 may be disposed at positions where the openings of the notches 210 are oriented in different directions, or may be disposed at intermediate positions between both end portions.

In addition to the above-mentioned solutions, the self-locking device can also achieve bidirectional self-locking of the driving shaft 110 by the connecting member 250. Referring to fig. 14, in detail, the connection member 250 is a screw penetrating through both ends of the friction ring 200, a nut is connected to the screw, and after the friction ring 200 is assembled to the driving shaft 110, the screw and the nut are installed, and a force is applied to both ends of the friction ring 200 to clasp the driving shaft 110, so that the friction ring 200 can be always in a state of clasping the driving shaft 110, thereby achieving bidirectional self-locking of the driving shaft 110.

Referring to fig. 3 to 14, based on the above embodiments, in another embodiment of the present invention, the limiting portion 220 and the assembling structure on the end cap 100 are specifically described.

Referring to fig. 3 to 15, the limiting portion 220 is a protrusion protruding from the periphery of the friction ring 200, the inner wall of the end cap 100 is provided with a locking portion 120 engaged with the protrusion, and the protrusion is locked into the locking portion 120 to limit the position change of the protrusion, so that the friction ring 200 cannot rotate synchronously with the driving shaft 110, and the protrusion only needs to be locked into the locking portion 120 to realize rotation limitation, so that an interference fit manner is not required between the locking portion 120 and the protrusion, and the friction ring 200 can be conveniently mounted.

Wherein the arch is the shelves handle, screens portion 120 is the draw-in groove, shelves to the card go into in the draw-in groove, shelves have longer length, be difficult to the separation after cooperating with the draw-in groove to guarantee the stability of friction ring 200 structure, this kind of cooperation mode is end cover 100 and friction ring 200's direct contact mode.

Or, protruding overcoat is equipped with the screens piece, and in the screens piece card was gone into the screens portion, the screens piece was two independent structures with the friction ring, can strengthen the cooperation intensity between protruding and the screens portion through the screens piece, and when replacing the friction ring, the screens piece can also continue to use, and this kind of cooperation mode is the indirect contact mode of end cover and friction ring.

Or, as shown in fig. 15, the end cap 100 is provided with the position-limiting sleeve 130, the position-limiting part 120 is provided on the position-limiting sleeve 130, the friction ring 200 is clamped in the position-limiting sleeve 130 to be matched with the end cap 100 through the position-limiting sleeve 130, such a structure is suitable for a case where the structure of the end cap 100 is large, if the specification of the friction ring 200 is increased, the strength of the friction ring 200 is increased, so that the driving effect of the driving shaft 110 on the friction ring 200 is reduced, the braking force is reduced, and the self-locking performance of the self-locking device can be ensured by providing the position-limiting sleeve 130.

Referring to fig. 16, in addition, the limiting portion 220 may also be a groove disposed on the periphery of the friction ring 200, the inner wall of the end cap 100 is convexly provided with a fixture block 140 engaged with the groove, after the fixture block 140 is engaged with the groove, the friction ring 200 may be limited from rotating in the circumferential direction, so as to achieve self-locking of the driving shaft 110, the fixture block 140 protrudes out of the inner wall of the end cap 100, the thickness of the fixture block 140 may be increased, so that the friction ring 200 at the groove position is in interference fit with the driving shaft 110, so as to maintain the structural stability of the friction ring 200 at the groove position, and the deformation of the friction ring 200 at other positions is not affected.

The above embodiments are all different structures of the friction ring 200, and in addition, the friction ring 200 may have other shapes, such as the friction ring 200 shown in fig. 17, the inner circumferential surface of which is serrated, and the outer circumferential surface of the friction ring 200 shown in fig. 18 is provided with the limiting portion 220 and other multiple protruding portions, as long as the main structure is a C-shaped ring body, and the ring body is provided with a member capable of limiting the rotation of the ring body, all of which fall within the scope of the present application.

The friction ring 200 may also be configured as shown in fig. 19, and includes an outer ring 300 and an inner ring 310 that are independent from each other, the stopper portion 220 is provided on the outer circumference of the outer ring 300, the outer ring 300 is fitted around the inner ring 310, the inner ring 310 contacts with the drive shaft 110, the friction ring 200 drives the outer ring 300 to move by the acting force between the inner ring 310 and the drive shaft 110 to hug the drive shaft 110, and the acting force between the inner ring 310 and the drive shaft 110 is increased, so that the outer ring 300 of the friction ring 200 may be made of a material that is easily deformable, and the inner ring 310 may be made of a material having a high friction coefficient.

The utility model also discloses a linear actuator, which is generally applicable to lifting devices such as lifting tables and lifting beds, wherein the linear actuator is internally provided with the motor with the self-locking function as a power component, and the linear actuator adopts the motor and is then configured in the lifting device, so that when the lifting device bears a large load, the situation that the driving shaft 110 reversely rotates to cause the retraction of the lifting device can not occur under the self-locking of the driver, and the stability of the equipment is kept.

As shown in fig. 20, the linear actuator includes a column, a screw rod assembly disposed in the column, a worm gear 400 for driving the screw rod assembly, the driving shaft 110 is a worm engaged with the worm gear 400, when the motor controls the worm to rotate, the worm gear 400 can be driven to rotate, and the screw rod assembly is driven by the worm gear 400, the screw rod assembly can be extended and retracted by the control column, the friction ring 200 on the worm can realize self-locking thereof, in addition, the friction ring 200 can also be disposed on a hub of the worm gear 400, self-locking is also performed on the worm gear 400, through engagement with the motor, the self-locking performance of the linear actuator is improved, and the screw rod assembly has a great torque, the friction ring 200 cannot be assembled on the screw rod.

The end cap 100 is a part of a cover body of the gear box, a part of the cover body connected with a shell of the motor defines a space for accommodating the self-locking device, and a part of the cover body connected with another part of the gear box defines a space for accommodating the worm wheel 400.

While the utility model has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the utility model is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the utility model 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 (14)

1. The motor with self-locking function, its characterized in that, the motor includes end cover and drive shaft, suit friction ring on the drive shaft, be equipped with the breach on the friction ring, the periphery of friction ring is equipped with spacing portion, the end cover with spacing portion cooperation, so that the friction ring is in the drive shaft is held tightly the drive shaft when rotating along the first direction.

2. The motor with self-locking function according to claim 1, wherein there are at least two limiting portions, and the two sides of the notch are provided with the limiting portions, so that the friction ring can hold the driving shaft tightly when the driving shaft rotates in a second direction opposite to the first direction.

3. The motor with self-locking function as claimed in claim 1, wherein the position-limiting portion is provided with at least one, one of two sides of the notch is provided with the position-limiting portion, and the other side is a free end.

4. The motor with self-locking function according to claim 3, wherein the friction ring is provided at its outer circumference with a rib having the same width as the friction ring, the rib being provided at the free end and having a length not more than half of the length of the friction ring.

5. The motor having a self-locking function according to any one of claims 1 to 3, wherein the thickness of the friction ring is tapered inward from both ends.

6. The motor with self-locking function according to any one of claims 1 to 4, wherein a connecting piece is provided at the notch to connect two ends of the friction ring respectively.

7. The motor with self-locking function according to claim 6, wherein the connecting member is a spring; or the connecting piece is an elastic sheet made of elastic material; or the connecting piece is a rigid piece penetrating through two ends of the friction ring; or, the connecting piece and the friction ring are integrally formed, and the thickness of the connecting piece is smaller than that of the friction ring.

8. The motor with self-locking function as claimed in any one of claims 1 to 4, wherein the position-limiting portion is a protrusion protruding from the outer periphery of the friction ring, and the end cap is provided with a retaining portion engaged with the protrusion.

9. The motor with self-locking function of claim 8, wherein the protrusion is a stopper, the locking portion is a locking groove, and the stopper is locked in the locking groove.

10. The motor with self-locking function as claimed in claim 8, wherein a stop collar is provided in the end cap, the locking portion is provided on the stop collar, and the friction ring is locked in the stop collar; or, the position limiting part is sleeved with a position clamping sleeve, and the position clamping sleeve is matched with the position clamping part.

11. The motor with the self-locking function according to any one of claims 1 to 4, wherein the limiting portion is a groove formed in the outer periphery of the friction ring, and a clamping block matched with the groove is formed in the end cover.

12. The motor with self-locking function according to any one of claims 1 to 4, wherein the center of the friction ring is offset from the axis of the drive shaft.

13. Linear actuator, characterized in that it comprises a motor with self-locking function according to any one of claims 1 to 12.

14. The linear actuator of claim 13, wherein the linear actuator comprises a column, a lead screw assembly disposed in the column, and a worm gear for driving the lead screw assembly, the driving shaft is a worm engaged with the worm gear, and the hub of the worm gear is also provided with the friction ring.

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