CN212131121U - Brake device of linear actuator and linear actuator - Google Patents

Abstract

The utility model provides a brake device of a linear actuator, which comprises a first friction piece and a second friction piece, the first friction piece is used for being fixed relative to the worm wheel (1), the second friction piece is used for being fixed relative to the shell (2) or being in an integral structure with the shell (2), the worm wheel (1) is used for being positioned circumferentially relative to the screw rod (3), and the worm wheel (1) slides freely along the axial direction relative to the screw rod (3), the worm wheel (1) is used for being meshed with the worm (4), when the worm (4) and the worm wheel (1) move relatively, the worm (4) applies acting force along the axial direction of the worm wheel (1) to the worm wheel (1), additionally, the utility model also discloses a linear actuator who adopts above-mentioned brake equipment, the utility model has the advantages of, adopt this kind of structure for it is more convenient when the user uses.

Description

Brake device of linear actuator and linear actuator

[ technical field ] A method for producing a semiconductor device

The utility model relates to a brake equipment and linear actuator of linear actuator belongs to the linear actuator field.

[ 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.

At present, linear actuator's use is more and more extensive, and wherein, common linear actuator includes electric putter, and common electric putter includes the torsional spring, and when electric putter received axial load, can realize electric putter's auto-lock through the characteristic of torsional spring self, nevertheless, can produce the torsional spring sound and the positive reverse sound difference of push rod is great when using the torsional spring, influences the user and uses for it is inconvenient during the use.

[ Utility model ] content

The utility model aims to solve the technical problem that a brake equipment of linear actuator is provided for it is more convenient during the use.

In order to solve the technical problem, the utility model discloses linear actuator's brake equipment includes first friction piece and second friction piece, first friction piece is used for the worm wheel fixed, the second friction piece is used for fixed or as an organic whole structure with the shell for the shell, the worm wheel is used for lead screw circumference location, just the worm wheel freely slides for the lead screw along its axis direction, the worm wheel is used for meshing mutually with the worm, the lead screw drives when bearing axial load worm wheel and worm motion, the effort along worm wheel axial direction is applyed to the worm wheel during worm wheel and worm relative motion, just the worm wheel passes through the effort drives first friction piece contact second friction piece is in order to produce frictional force or keep away from the second friction piece.

After the structure is adopted, firstly, the brake device comprises a first friction piece and a second friction piece, the first friction piece and the second friction piece are parts for generating friction force, the first friction piece is used for being fixed relative to the worm wheel, namely the worm wheel drives the first friction piece to move when moving, the first friction piece drives the worm wheel to brake when being braked by the friction force, the second friction piece is used for being fixed relative to the shell and is integrated with the shell, the worm wheel is used for being circumferentially positioned relative to the screw rod, the worm wheel freely slides relative to the screw rod along the axial direction of the worm wheel, namely the screw rod is driven to rotate when the worm wheel rotates, the worm wheel is prevented from bearing the axial load of the screw rod due to the axial positioning with the screw rod, and therefore the worm wheel is prevented from driving the first friction piece to contact the second friction piece due to the axial load to influence the normal work of the linear actuator, and is used for being meshed, when the worm and the worm wheel move relatively, the worm applies acting force along the axial direction of the worm wheel to the worm wheel, namely axial component force generated between the worm wheel and the worm when the worm wheel and the worm move relatively, the worm wheel drives the first friction piece to contact the second friction piece through the acting force so as to generate friction force or to be far away from the second friction piece, and when the first friction piece contacts the second friction piece, the worm wheel is subjected to larger friction resistance.

Secondly, among the prior art, influence the user and use when electric putter adopts the torsional spring to carry out the auto-lock, based on above-mentioned structure, adopt the worm wheel to drive first friction piece contact second friction piece in this device, realize the auto-lock through the frictional force between the two, so do not have the torsional spring sound that produces and the great problem of push rod positive and negative rotation sound difference among the prior art during the torsional spring auto-lock to it is more convenient when making the user use.

Based on above-mentioned structure, during worm gear relative motion, can produce the effort between worm wheel and the worm, wherein the worm can apply the effort along worm wheel axis direction to the worm wheel for the worm wheel is drunkenness along axial direction, and the effort along worm axis direction is applyed equally to the worm wheel, makes the worm drunkenness along axial direction, and the internal force drive worm wheel or the worm that produce when moving through worm gear self moves makes device simple structure, the production and processing of being convenient for.

Based on above-mentioned structure, when linear actuator stretches out, rotate by worm drive worm wheel, the worm wheel and then drives the lead screw motion, at this moment, effort drive worm wheel that the mutual motion produced between worm wheel and the worm moves along the one side of keeping away from the second friction piece, make to have the clearance between first friction piece and the second friction piece and not produce frictional force, linear actuator normally stretches out, when linear actuator shrink, by worm drive worm wheel antiport, the worm wheel and then drives the lead screw motion, at this moment, effort drive worm wheel that the mutual motion produced between worm wheel and the worm moves along the one side that is close to the second friction piece, make first friction piece and second friction piece contact in order to produce frictional force, slow down the slew velocity of worm wheel, and then slow down the speed of mechanism shrink.

Preferably, the brake device comprises a spline, one end of the spline is circumferentially positioned with the screw rod, the other end of the spline is circumferentially positioned with the worm wheel, and the worm wheel is circumferentially positioned with the screw rod through the spline.

Preferably, the worm wheel is provided with a spline groove for conveniently mounting the spline, and the worm wheel is in sliding connection with the spline along the axis direction of the worm wheel.

Preferably, the brake device comprises a positioning shaft, the worm wheel is mounted on the positioning shaft, and gaps exist between the worm wheel and the positioning shaft and the screw rod.

Preferably, the positioning shaft is provided with a protrusion, the first friction piece is a positioning shaft, and the worm wheel drives the protrusion on the positioning shaft to contact with the second friction piece to generate friction force through the acting force.

Preferably, the brake device comprises a bearing fixed relative to the housing, and one end of the positioning shaft is located in the bearing.

Preferably, the outer surface of the positioning shaft is in clearance fit with the inner surface of the bearing.

Preferably, the bearing is used for being mounted on the tail pull, and the tail pull is a second friction piece.

Preferably, the brake device comprises a friction plate, and the friction plate is positioned between the first friction member and the second friction member.

The utility model also discloses a linear actuator, draw and brake equipment including lead screw, worm wheel, driving motor, worm, shell, tail, driving motor drives the worm wheel through the motion of drive worm and rotates, and the worm wheel drives the lead screw and rotates, brake equipment adopt as above the scheme arbitrary above linear actuator's brake equipment.

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 will be described in further detail with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of a brake apparatus according to an embodiment;

FIG. 2 is a schematic view of a worm gear of a brake apparatus according to an embodiment;

FIG. 3 is a schematic view of a spline of a brake apparatus according to an embodiment;

FIG. 4 is a schematic view of a positioning shaft of a brake apparatus according to an embodiment;

FIG. 5 is a schematic view of an embodiment of a linear actuator;

FIG. 6 is an enlarged view of a portion of FIG. 5;

FIG. 7 is a schematic diagram of a motor of an embodiment tri-linear actuator;

fig. 8 is a partially enlarged view of fig. 7.

[ detailed description ] embodiments

The technical solutions of the embodiments of the present invention are explained and explained below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work 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 to indicate orientations or positional relationships based on the drawings, and are only used for convenience in describing embodiments and simplifying the description, but do not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The first embodiment is as follows:

as shown in fig. 1, a preferred structure of the brake device of the linear actuator of the embodiment includes a first friction member and a second friction member, the first friction member is used for being fixed relative to the worm wheel 1, the second friction member is used for being fixed relative to the housing 2 or being an integral structure with the housing 2, the worm wheel 1 is used for being positioned circumferentially relative to the lead screw 3, the worm wheel 1 freely slides relative to the lead screw 3 along the axial direction thereof, the worm wheel 1 is used for being engaged with the worm 4, the lead screw 3 drives the worm wheel 1 and the worm 4 to move when bearing an axial load, the worm 4 applies a force along the axial direction of the worm wheel 1 to the worm wheel 1 when the worm wheel 1 and the worm 4 move relative to each other, and the worm wheel 1 drives the first friction member to contact the second friction member through the force to generate a friction force or to be away from the second friction member.

After the structure is adopted, firstly, the brake device comprises a first friction piece and a second friction piece, the first friction piece and the second friction piece are parts for generating friction force, the first friction piece is used for being fixed relative to the worm wheel 1, namely the worm wheel 1 drives the first friction piece to move when moving, the first friction piece drives the worm wheel 1 to brake when being braked by the friction force, the second friction piece is used for being fixed relative to the shell 2 and is integrated with the shell 2, the worm wheel 1 is used for being circumferentially positioned relative to the screw rod 3, the worm wheel 1 freely slides relative to the screw rod 3 along the axial direction, namely the screw rod 3 is driven to rotate when the worm wheel 1 rotates, and the worm wheel 1 is prevented from bearing the axial load of the screw rod 3 due to being axially positioned with the screw rod 3, so that the worm wheel 1 is prevented from driving the first friction piece to contact the second friction piece due to the axial load to influence the normal work of the linear actuator, the worm wheel 1 is used for being meshed with the worm 4, when the worm 4 and the worm wheel 1 move relatively, the worm 4 applies acting force along the axial direction of the worm wheel 1 to the worm wheel 1, namely axial component force generated between the worm wheel 1 and the worm 4 when the worm wheel 1 and the worm 4 move relatively, the worm wheel 1 drives the first friction piece to contact the second friction piece through the acting force so as to generate friction force or keep away from the second friction piece, and when the first friction piece contacts the second friction piece, the worm wheel 1 is subjected to larger friction resistance.

Secondly, among the prior art, influence the user and use when electric putter adopts the torsional spring to carry out the auto-lock, based on above-mentioned structure, adopt worm wheel 1 to drive first friction piece contact second friction piece in this device, realize the auto-lock through the frictional force between the two, so do not have the torsional spring sound that produces and the great problem of push rod positive and negative rotation sound difference among the prior art during the torsional spring auto-lock to it is more convenient when making the user use.

Based on the structure, when the worm wheel 1 and the worm 4 move relatively, acting force can be generated between the worm wheel 1 and the worm 4, wherein the worm 4 can apply acting force along the axis direction of the worm wheel 1 to the worm wheel 1, so that the worm wheel 1 moves along the axial direction, the worm wheel 1 also applies acting force along the axis direction of the worm 4 to the worm 4, so that the worm 4 moves along the axial direction, and the internal acting force generated when the worm wheel 1 and the worm 4 move per se drives the worm wheel 1 or the worm 4 to move, so that the device is simple in structure and convenient to produce and process.

Based on the structure, when the linear actuator extends out, the worm gear 1 is driven by the worm 4 to rotate, the worm gear 1 further drives the screw rod 3 to move, at the moment, acting force generated by mutual motion between the worm gear 1 and the worm 4 drives the worm gear 1 to move along one side far away from the second friction piece, so that a gap is formed between the first friction piece and the second friction piece, friction force is not generated, the linear actuator normally extends out, when the linear actuator contracts, the worm gear 1 is driven by the worm 4 to reversely rotate, the worm gear 1 further drives the screw rod 3 to move, at the moment, acting force generated by mutual motion between the worm gear 1 and the worm 4 drives the worm gear 1 to move along one side near the second friction piece, so that the first friction piece is in contact with the second friction piece to generate friction force, the rotating speed of the worm gear 1 is reduced, the contracting speed of the mechanism is reduced, and meanwhile, the device can, can assist other brake devices to realize further self-locking.

In order to optimize the structure, as shown in fig. 3, the brake device of the embodiment preferably includes a spline 5, one end of the spline 5 is circumferentially positioned with the lead screw 3, and the other end is circumferentially positioned with the worm wheel 1, the worm wheel 1 is circumferentially positioned with the lead screw 3 through the spline 5, and by additionally providing the spline 5, firstly, the worm wheel 1 can drive the lead screw to rotate together when moving, secondly, when the worm wheel 1 moves by acting force along the axial direction, the worm wheel can not be limited by the lead screw 3, and in addition, one end of the worm wheel 1 can be supported, so that the worm wheel can normally rotate.

Besides, a flat hole can be used for circumferential positioning between the worm wheel 1 and the screw rod 3, and when the worm wheel 1 moves under the action of the acting force along the axial direction, the worm wheel is not limited by the screw rod 3.

In order to enable the worm wheel 1 to slide along the axis direction thereof, as shown in fig. 2, it is preferable that the worm wheel 1 is provided with a spline groove for conveniently mounting the spline 5, and along the axis direction of the worm wheel 1, the worm wheel 1 is in sliding connection with the spline 5, when the worm wheel 1 receives an acting force along the axis direction thereof, the worm wheel 1 slides along the axial direction thereof, by providing the spline groove, since the spline is provided with the protruding blocks at intervals in the circumferential direction thereof, when the spline 5 is located in the spline groove, that is, when the protruding blocks are located in the spline groove, the worm wheel 1 can be located in the circumferential direction relative to the spline 5 and can slide along the axial direction thereof, in order to ensure that the worm wheel 1 does not obstruct and does not separate from the spline 5 when sliding, the length of the protruding blocks of the spline 5 is greater than the maximum distance of the worm wheel 1 sliding along the side away from.

In order to enable the worm wheel 1 to rotate, as shown in fig. 4, the braking device of the present embodiment preferably includes a positioning shaft 6, the worm wheel 1 is mounted on the positioning shaft 6, gaps exist between the worm wheel 1 and the positioning shaft 6 and the lead screw 3, the positioning shaft 6 is used for supporting the worm wheel 1 so that the worm wheel 1 can rotate, the gaps existing between the worm wheel 1 and the positioning shaft 6 and the lead screw 3 include axial gaps or circumferential gaps, when the positioning shaft 6 is sleeved on the lead screw 3, the gaps existing between the worm wheel 1 and the positioning shaft 6 and the lead screw 3 are circumferential gaps, when the positioning shaft 6 is not sleeved on the lead screw 3, the gaps existing between the worm wheel 1 and the positioning shaft 6 and the lead screw 3 are axial gaps, through which the rotation of the worm wheel 1 and the positioning shaft 6 can be prevented from being influenced by the lead screw 3, and the sliding of the worm wheel 1 can be prevented from being influenced by the lead screw 3, while ensuring that the worm wheel 1 is not subjected to axial loads.

In addition, be equipped with the recess in the circumference of location axle 6, the accessible makes worm wheel 1 and 6 axial positioning of location axle with the mode of jump ring placing in the recess.

In order to prevent the worm wheel 1 from being worn, it is preferable that a protrusion is arranged on the positioning shaft 6 in this embodiment, the positioning shaft 6 is a first friction member, and the worm wheel 1 drives the protrusion on the positioning shaft 6 to be in mutual contact with a second friction member through the acting force so as to generate friction force, so that the worm wheel 1 is prevented from being directly contacted with the second friction member to cause wear.

In order to enable the worm wheel 1 and the positioning shaft 6 to move smoothly, the brake device of the embodiment preferably comprises a bearing 7, the bearing 7 is fixed relative to the housing 2, one end of the positioning shaft 6 is located in the bearing 7, the worm wheel 1 and the positioning shaft 6 can rotate relative to the housing through the bearing 7, one end of the worm wheel 1 is supported through a spline, and the other end of the worm wheel 1 is supported through the bearing, so that the worm wheel 1 and the positioning shaft 6 can move smoothly.

In order to enable the positioning shaft 6 to slide, in this embodiment, it is preferable that a clearance fit is formed between an outer surface of the positioning shaft 6 and an inner surface of the bearing 7, so that the positioning shaft 6 can slide relative to the bearing 7, and in order to prevent the positioning shaft 6 from slipping, a length of the bearing 7 is greater than a maximum distance after the positioning shaft 6 is forced to slide.

In order to optimize the structure, this embodiment is preferred bearing 7 be used for installing on tail pull 9, just tail pull 9 is the second friction piece, the tail is drawn and is equipped with the tail and draws the hole on 9, bearing 7 is installed in the tail pull hole to the effect that the 9 is drawn to the make full use of tail makes the mounting hole of processing out second friction piece and bearing 7 on the shell 2 again, thereby optimizes the structure, material saving, the processing production of the shell 2 of being convenient for.

In order to increase the frictional force between the first friction member and the second friction member, the brake device is preferably selected to include the friction plate 8 in this embodiment, the friction plate 8 is located between the first friction member and the second friction member, the friction plate 8 is clamped between the first friction member and the second friction member, the friction plate 8 is preferably selected to be fixed relative to the tail pull 9 in this embodiment, thermal deformation is prevented when the tail pull 9 rubs, normal work of the brake device and the service life of the tail pull 9 are affected, when the worm wheel 1 is forced to axially float, the first friction member is driven to contact the friction plate 8, the friction plate 8 is driven to contact the second friction member, both sides of the friction plate 8 are all subjected to the frictional force, the frictional force between the first friction member and the second friction member is further increased, and the worm wheel 1 is prevented from rotating.

In addition, in order to enable the screw rod to normally rotate, a supporting bearing 10 is arranged on the screw rod 3, one end of an inner ring of the supporting bearing 10 is in interference fit with the outer surface of the spline 5, the other end of the inner ring is positioned by a key 11, and the key 11 is fixed relative to the screw rod 3.

Example two:

the embodiment discloses a linear actuator, as shown in fig. 5 and 6, the brake device of the first embodiment is used for being installed in the linear actuator of the first embodiment, the first embodiment mainly comprises a screw rod 3, a worm wheel 1, a driving motor, a worm 4, a shell 2, a tail pull 9 and a brake device, the driving motor drives the worm wheel 1 to rotate by driving the worm 4 to move, the worm wheel 1 drives the screw rod 3 to rotate, and the linear actuator is connected with an external device by the tail pull 9.

Example three:

the difference between this embodiment and the first embodiment is that, as shown in fig. 7 and 8, in this embodiment, the worm 4 is connected to the motor shaft 14, the motor shaft 14 is provided with a first friction member, the motor housing 12 is provided outside the motor shaft 14, the second friction member is fixed relative to the motor housing, when the worm wheel 1 and the worm 4 move relatively, the worm 4 receives a force applied thereto by the worm wheel 1 in the axial direction thereof, and the worm 4 drives the first friction piece to contact the second friction piece by the acting force to generate friction force or to be far away from the second friction piece, in order to increase the friction force, a friction plate of the motor shaft can be added between the first friction member and the second friction member, meanwhile, the surface of the first friction piece or the friction plate contacting with the second friction piece can be set as an inclined surface, by increasing the contact area and thus the friction force, the technical effects of the first embodiment can be achieved.

In addition, the brake device of the first and third embodiments is also mounted on the linear actuator at the same time.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. 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. A brake apparatus of a linear actuator, characterized in that: the worm gear comprises a first friction piece and a second friction piece, wherein the first friction piece is used for being fixed relative to a worm gear (1), the second friction piece is used for being fixed relative to a shell (2) or is of an integral structure with the shell (2), the worm gear (1) is used for being circumferentially positioned relative to a screw rod (3), the worm gear (1) freely slides relative to the screw rod (3) along the axis direction of the worm gear, the worm gear (1) is used for being meshed with a worm (4), when the worm (4) and the worm gear (1) move relatively, acting force along the axial direction of the worm gear (1) is applied to the worm gear (1) by the worm (4), and the worm gear (1) drives the first friction piece to contact the second friction piece through the acting force so as to generate friction force or keep away from the second friction piece.

2. A brake apparatus for a linear actuator according to claim 1, wherein: brake equipment includes spline (5), spline (5) one end with lead screw (3) circumference location, the other end with worm wheel (1) circumference location, worm wheel (1) realizes circumference location through spline (5) and lead screw (3).

3. A brake apparatus for a linear actuator according to claim 2, wherein: worm wheel (1) on be equipped with the spline groove of being convenient for installation spline (5), and along the axis direction of worm wheel (1), worm wheel (1) with be sliding connection between spline (5).

4. A brake apparatus for a linear actuator according to claim 1, wherein: brake equipment includes location axle (6), worm wheel (1) is installed on location axle (6), worm wheel (1) and location axle (6) all with there is the clearance between lead screw (3).

5. The brake apparatus of a linear actuator as claimed in claim 4, wherein: be equipped with the arch on location axle (6), location axle (6) are first friction spare, worm wheel (1) passes through effort drives arch and the second friction spare on location axle (6) are contacted each other in order to produce frictional force.

6. The brake apparatus of a linear actuator as claimed in claim 4, wherein: the brake device comprises a bearing (7), the bearing (7) is fixed relative to the shell (2), and one end of the positioning shaft (6) is located in the bearing (7).

7. The brake apparatus of a linear actuator as claimed in claim 6, wherein: the outer surface of the positioning shaft (6) is in clearance fit with the inner surface of the bearing (7).

8. The brake apparatus of a linear actuator as claimed in claim 6, wherein: the bearing (7) is used for being installed on the tail pull (9), and the tail pull (9) is a second friction piece.

9. A brake apparatus for a linear actuator according to claim 1, wherein: the brake device comprises a friction plate (8), and the friction plate (8) is located between the first friction piece and the second friction piece.

10. A linear actuator, comprising a screw rod (3), a worm wheel (1), a driving motor, a worm (4), a housing (2), a tail pull (9) and a brake device, wherein the driving motor drives the worm wheel (1) to rotate by driving the worm (4), and the worm wheel (1) drives the screw rod (3) to rotate, characterized in that the brake device is the brake device of the linear actuator according to any one of claims 1 to 9.

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