KR101903616B1 - Step actuator - Google Patents

Abstract

The step actuator is started. After the support bracket is appropriately positioned on the cover coupled to the stator, the step actuator rotates the support bracket in the normal direction so that the support bracket is engaged with the cover. That is, since the physical force does not act when the cover and the support bracket are engaged, the internal components do not flow at all. Therefore, there is no possibility that the centers of the parts are inconsistent, so that the reliability of the product is improved. Further, since the support bracket is engaged with the cover by rotation of the support bracket, the parts are not damaged. Further, since the assembling process of the support bracket and the cover is simple, the productivity is improved.

Description

STEP ACTUATOR {STEP ACTUATOR}

An embodiment relates to a step actuator.

The step actuator is a lightweight, compact, slim and high performance device and is widely used in devices requiring precise control.

1 is a perspective view of a conventional step actuator, which will be described.

As shown in the figure, a rotor (not shown) is rotatably and rotatably installed in a housing 11 constituting a stator, and a lead screw 13, which reciprocates linearly by the rotor, Respectively.

A cover 15 is coupled to the upper surface of the housing 11 and a support bracket 17 for guiding the linear motion of the lead screw 13 is coupled to the cover 15. The cover 15 and the support bracket 17 bend the projections 15a formed on the upper end face of the cover 15 inward and engage with each other.

The conventional step actuator as described above bends the protrusion 15a by applying an external force, so that the parts move when the cover 15 and the support bracket 17 are engaged. As a result, there is a disadvantage that the reliability of the product is deteriorated due to the inconsistency of the centers of the components and errors.

Further, there is a disadvantage that parts are damaged when bending the projection 15a.

Also, since the projections 15a must be bent one by one, the assembling process is troublesome. Therefore, there is a disadvantage that the productivity is lowered.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and an object of the present invention is to provide a step actuator which can improve reliability.

Another object of the present invention is to provide a step actuator capable of preventing parts from being damaged and at the same time improving productivity.

A step actuator according to an embodiment includes: a stator having a housing; a rotor installed inside the stator and rotating in normal and reverse directions with the stator; A lead screw having one side coupled to the rotor side and the other side exposed to the outside of the stator and reciprocating linearly by the rotational motion of the rotor; A cover coupled to the stator; And a support bracket detachably coupled to the cover in accordance with a forward / reverse rotation case and guiding a linear movement of the lead screw by supporting the other side of the lead screw.
The bracket may include a first support tube and a second support tube that is smaller than the first support tube. A first end surface (step surface) may be formed between the first support pipe and the second support pipe.
The cover may include a coupling pipe disposed on a side surface of the bearing and a latching protrusion formed on an upper end of the coupling pipe.
The coupling tube may be disposed in the first support tube.
The coupling pipe and the latching frame may be integrally formed, and the latching frame may extend from the inner circumferential surface of the coupling pipe to the upper side of the bearing.
The upper surface of the latching frame may contact the first end surface (stepped surface).
The lower surface of the latching frame can contact the upper surface of the outer ring of the bearing.

A step actuator according to an embodiment includes: a housing; A stator disposed in the housing and including a bobbin; A rotor disposed within the stator, the rotor including a magnet and a motion transmitting member; A lead screw coupled with the rotor; A cover disposed on the housing; A bearing disposed between the housing and the cover; And a support bracket coupled to the cover.

The motion transmitting member may include a stepped portion disposed between the lead screw and the magnet and facing the support frame and the support frame. The motion transmitting member may include a support frame formed on the outer peripheral surface on the upper end side and a cross section formed on the outer peripheral surface on the central side.

For example, the motion transmitting member may include a support surface protruding in the bearing direction and formed on the outer peripheral surface on the upper end side and a step surface formed on the outer peripheral surface on the central portion side.

The supporting frame may be formed by melting at an end of the motion transmitting member.

The inner ring of the bearing may be disposed between the support frame and the step of the motion transmitting member. The inner ring side of the upper surface of the bearing can contact the support frame. The inner surface of the lower surface of the bearing can contact the end surface.

In the step actuator according to the embodiment, after the support bracket is appropriately positioned on the cover coupled to the stator, the support bracket is coupled to the cover by rotating the support bracket in the forward direction. That is, since the physical force does not act when the cover and the support bracket are engaged, the internal components do not flow at all. Therefore, there is no possibility that the centers of the parts are inconsistent, so that the reliability of the product is improved.

Further, since the support bracket is engaged with the cover by rotation of the support bracket, the parts are not damaged.

Further, since the assembling process of the support bracket and the cover is simple, the productivity is improved.

1 is a perspective view of a conventional step actuator;
2 is a perspective view of a step actuator according to an embodiment.
3 is a sectional view of Fig. 2;
4 is an exploded perspective view of the cover and support bracket shown in Fig.
Figures 5A-6B are enlarged views of the main assembly showing the coupling of the support bracket to the cover.

Hereinafter, a step actuator according to an embodiment will be described in detail with reference to the accompanying drawings.

FIG. 2 is a perspective view of a step actuator according to an embodiment, and FIG. 3 is a sectional view of FIG. 2. FIG.

As shown in the figure, the step actuator according to the present embodiment is provided with a cylindrical stator having first and second stators 110 and 120, respectively, which are positioned on the upper and lower sides and are coupled to each other.

Refers to the surface and direction of the other components including the stator, and the direction and the direction toward the first stator 110 side are referred to as "upper surface and upper side" and the direction and direction toward the second stator 120 side Quot; lower and lower side ".

The first and second stators 110 and 120 are connected to the first and second housings 111 and 121 and the first and second yokes 113 and 123 and the first and second bobbins 115 and 125 and the first and second coils 118 and 128 Respectively.

The first housing 111 is formed in the form of a double tube with a bottom opened, and the inner tube is formed by a plurality of tooths 111a having mutual gaps.

The first yoke 113 is formed in a ring shape and is coupled to the lower surface of the first housing 111. The first yoke 113 has a plurality of teeth 113a coupled to the inner circumferential surface of the first yoke 113 by being engaged with the teeth 111a of the first housing 111, .

The first bobbin 115 is formed in a cylindrical shape and inserted between the first housing 111 and the first yoke 113 and the first coil 118 is wound on the first bobbin 115.

The second housing 121 is formed in the shape of a double tube with an opened top surface, and the inner tube is formed by a plurality of tooths 121a having mutual gaps. The upper end face of the second housing 121 is in contact with the lower end face of the first housing 111.

The second yoke 123 is formed in a ring shape and is coupled to the upper surface of the second housing 121. A plurality of teeth 123a coupled to the inner circumferential surface of the second yoke 123 in a manner to be engaged with the teeth 121a of the second housing 121, .

The first housing 111 and the second housing 121 are formed in the same shape and are symmetrically formed. The first yoke 113 and the second yoke 123 are formed in the same shape and are symmetrically installed.

The second bobbin 125 is formed into a cylindrical shape and inserted between the second housing 121 and the second yoke 123 and the second coil 128 is wound around the second bobbin 125. A vertical tube 125a is integrally formed in the second bobbin 125. A lower side of a lead screw 140 described later is inserted and supported in the vertical tube 125a.

The first and second bobbins 115 and 125 are provided with first and second terminals 116 and 126 for transmitting external power to the first and second coils 118 and 128, 110 and 120, respectively.

The first and second terminals 116 and 126 are exposed to the outside through recessed grooves 111b and 121b formed opposite to the lower end face of the first housing 111 and the upper end face of the second housing 121, .

A ring-shaped rotor provided in the stator is rotatable in the normal and reverse directions and a lead screw 140 is installed in the magnet 130 to linearly reciprocate by the rotation of the magnet 130 do. The lower side of the lead screw 140 is inserted into the vertical tube 125a, and the upper side is exposed to the outside of the upper portion of the stator.

Between the magnet 130 and the lead screw 140 is coupled a cylindrical motion transmitting member 150 for transmitting the rotational motion of the magnet 130 to the lead screw 140 to linearly move the lead screw 140. The outer circumferential surface of the motion transmitting member 150 is coupled to the inner circumferential surface of the magnet 130, and the inner circumferential surface thereof is in contact with the outer circumferential surface of the lead screw 140. At this time, screw threads interlocking with each other are formed on the inner peripheral surface of the motion transmitting member 150 and the outer peripheral surface of the lead screw 140, respectively.

Thus, as the first and second coils 118 and 128 are selectively supplied with electric current, the magnet 130 and the motion transmitting member 150 are integrally rotated in the forward and reverse directions by the action of the stator and the magnet 130.

The lead screw 140 and the motion transmitting member 150 are engaged with each other by the screw thread so that the lead screw 140 is prevented from rotating, Reciprocating.

The linear motion of the lead screw 140 is guided by the support bracket 170.

In detail, a cover 160 is coupled to the upper surface of the first stator 110 to prevent detachment of components, and a support bracket 170 is coupled to the cover 160.

The outer circumferential surface of the upper side of the lead screw 140 is inserted into and supported by the support bracket 170. The inner circumferential surface of the upper side outer circumferential surface of the lead screw 140 and the support bracket 170 into which the lead screw 140 is inserted is Quot; D "shape that is non-circular. Accordingly, when the motion transmitting member 150 rotates in the forward and reverse directions with the screw thread of the motion transmitting member 150 engaged with the screw thread of the lead screw 140, the lead screw 140 does not rotate, do.

A bearing 180 for supporting the rotation of the motion transmitting member 150 is installed at the center side of the cover 160. The upper surface inner ring side and the lower inner ring side of the bearing 180 are engaged with the support frame 151 and the end surface (step surface) 153 respectively formed on the upper end side outer peripheral surface and the central portion side outer peripheral surface of the motion transmitting member 150, The outer ring side is caught by the cover 160 to be described later. As a result, the bearing 180 is not released. The motion transmitting member 150 is formed by injection molding of synthetic resin. The supporting frame 151 is formed by melting the upper end outer peripheral surface of the motion transmitting member 150.

The mounting structure of the bearing 180 supported by the cover 160 and the coupling structure of the lead screw 140 and the support bracket 170 will be described later.

The step actuator according to the present embodiment can detachably connect the support bracket 170 to the cover 160 coupled to the stator. That is, after the support bracket 170 is positioned to surround the outer surface of the cover 160, when the support bracket 170 is rotated in the clockwise direction, the support bracket 170 is engaged with the cover 160, When the bracket 170 is rotated counterclockwise in the reverse direction, the support bracket 170 is separated from the cover 160.

The coupling structure of the cover 160 and the support bracket 170 will be described with reference to Figs. 3 and 4. Fig. 4 is an exploded perspective view of the cover and support bracket shown in Fig.

Hereinafter, the direction corresponding to the longitudinal direction of the lead screw 140 is referred to as "axial direction", the direction corresponding to the radial direction is referred to as "radial direction", and the direction corresponding to the circumferential direction is referred to as "circumferential direction".

As shown in the figure, the cover 160 has a coupling frame 161, a support piece 163, a rotation preventing protrusion 165, a first contact piece 167, and a coupling pipe 169.

The coupling frame 161 is formed in a ring shape having a predetermined width and is coupled to the upper surface of the first housing 111.

The support pieces 163 extend upward from the outer peripheral surface of the coupling frame 161 and are directed toward the upper end side of the lead screw 140 and are provided in a plurality of mutually spaced spaces. At this time, the hypothetical line connecting the support pieces 163 has a substantially circular shape.

The rotation preventing protrusions 165 extend radially outward from the upper end surface of the support piece 163 and are provided on one end face and the other end face in the circumferential direction of the support bracket 163, The engaging piece 175 and the engaging projection 177 of the engaging member 170 engage with each other. Then, when the support bracket 170 is engaged with the cover 160, the support bracket 170 is not rotated in the circumferential direction.

The first and second bending pieces 165a and 165b are formed on one end surface and the other end surface in the circumferential direction of the rotation preventing protrusion 165 so as to face each other and engage with the engaging piece 175 and the locking protrusion 177, respectively. The first and second bending pieces 165a and 165b have a wider contact area between the engaging piece 175 and the engaging protrusion 177 so that the engaging piece 175 and the engaging protrusion 177 are firmly engaged with each other.

The first contact piece 167 extends radially outward from the upper end surface of the support piece 163 and contacts the second contact piece 179 to be described later so that the support bracket 170 is axially .

The coupling pipe 169 extends from the inner circumferential surface of the coupling frame 161 to the upper end side of the lead screw 140 and the bearing 180 is inserted and supported on the inner circumferential surface thereof. At this time, on the upper end surface and the lower end surface of the coupling pipe 169, there are provided a latching protrusion 163 which is in contact with the upper surface side of the upper surface of the bearing 180 and the lower surface side of the lower surface, A plurality of stoppers 169a and a plurality of stoppers 169b are formed. The stopper 169b is bent by 90 degrees and is brought into contact with the lower surface of the bearing 180. [

The stopper 169b is opposed to the end face (step face) 153 of the motion transmitting member and the stopping frame 169a is formed to face the supporting frame 151. [

The support bracket 170 has a support pipe 171, an extension frame 173, a retaining piece 175, a locking projection 177 and a second contact piece 179.

The support tube 171 has a first support tube 171a and a second support tube 171b extending upward from the upper end surface of the first support tube 171a. The diameter of the second support tube 171b is smaller than the diameter of the first support tube 171a and protrudes upward from the inside of the first support tube 171a. Therefore, a cross-section (step surface) 171c recessed radially inward is formed at the interface between the first support pipe 171a and the second support pipe 171b.

The lower side of the first support pipe 171a is inserted between the support piece 163 and the coupling pipe 169. [ Therefore, the lower outer circumferential surface of the first support tube 171a is in contact with the inner circumferential surface of the support piece 163, and the inner circumferential surface thereof is in contact with the outer circumferential surface of the coupling tube 169.

The upper side inner peripheral surface of the second support pipe 171b is formed so as to correspond to the shape of the upper side outer peripheral surface of the lead screw 140 as described above and the upper side outer peripheral surface of the lead screw 140 And is inserted and supported. Therefore, the lead screw 140 is supported by the second support tube 171b and is not rotated, as described above.

The latching frame 169a formed on the upper surface of the coupling pipe 169 contacts the end face 171c formed at the boundary between the first support pipe 171a and the second support pipe 171b.

The extension frame 173 is formed in a ring shape extending radially outward from the outer circumferential surface of the first support pipe 171a of the support pipe 171 and has a lower surface formed with the rotation preventing protrusion 165 and the first contact piece 167, As shown in Fig.

The engaging piece 175 is bent downward from the outer circumferential surface of the elongated frame 173 and directed toward the lower end side of the lead screw 140. The engaging pieces 175 are formed as a plurality of mutually spaced apart inner surfaces and oppose the outer peripheral surface of the coupling frame 161.

When the supporting bracket 170 is rotated clockwise in the forward direction, the engaging pieces 175 are positioned between the adjacent supporting pieces 163 and the supporting pieces 163, And is caught on one end face in the circumferential direction of the rotation preventing protrusion 165. [ Then, the support bracket 170 is no longer rotated in the clockwise direction.

The engaging protrusion 177 is formed on the outer peripheral surface of the extended portion 173 between the engaging piece 175 and the engaging piece 175 and has elasticity. The locking protrusions 177 extend from the other end surface in the circumferential direction of the retaining piece 175 along the circumferential direction of the extended protrusion 173 to form a cantilever shape, It is caught on the other end in the circumferential direction.

That is, the locking protrusions 177 are positioned between the adjacent supporting pieces 163 and the supporting pieces 163, and as the supporting bracket 170 rotates in the clockwise direction, the rotation preventing protrusions 165 And is caught on the other end surface in the circumferential direction of the rotation preventing protrusion 165 over the upper surface. Then, the support bracket 170 is no longer rotated in the counterclockwise direction. At this time, a gap between the other end surface of the engaging piece 175 and the free end side of the engaging projection 177 is formed to correspond to the circumferential width of the rotation preventing protrusion 165.

The bottom surface of the free end side of the engaging projection 177 facing the lower end side of the lead screw 140 is moved toward the fixed end so that the engaging protrusion 177 smoothly moves over the upper surface of the rotation preventing protrusion 165, Is formed to be inclined in such a manner as to be closer to the upper end side of the base plate 140.

The second contact piece 179 is bent radially inward from the lower end surface of the engaging piece 175 so that the upper surface thereof contacts the lower surface of the first contact piece 167.

The support bracket 170 is positioned on the upper side of the cover 160. Since the upper surface of the second contact piece 179 formed integrally with the support bracket 170 contacts the lower surface of the first contact piece 167 formed integrally with the cover 160, 160, it does not flow in the axial direction.

An embossing 167a is formed on the lower surface of the first contact piece 167 so as to be in close contact with the upper surface of the second contact piece 179 so that the cover 160 and the support bracket 170 are in close contact with each other. The embossing 167a is brought into close contact with the second contact piece 179 when the support bracket 170 is rotated so that the engagement piece 175 and the engagement projection 177 are engaged with the rotation preventing protrusion 165, (179) to the lower end side of the lead screw (140).

A method of coupling the support bracket 170 to the cover 160 will be described with reference to Figs. 4 to 6B. Figures 5A-6B are enlarged views of the main assembly showing the coupling of the support bracket to the cover.

The first support tube 171a of the support bracket 170 is inserted between the support piece 163 of the cover 160 and the coupling tube 169 so that the support bracket 170 The engaging projection 175 and the engaging projection 177 are positioned between the rotation preventing protrusion 165 of the cover 160 and the rotation preventing protrusion 165. [

5A, since the first contact piece 167 of the cover 160 and the second contact piece 179 of the support bracket 170 are not superposed in the axial direction as shown in Fig. 5B, The lower surface of the first contact piece 167 and the upper surface of the second contact piece 179 do not contact each other.

6A, when the support bracket 170 is rotated clockwise in the state of FIGS. 5A and 5B, the one end surface in the circumferential direction of the retaining piece 175 is in contact with the first bending piece 165a, And the engaging protrusion 177 rides over the upper surface of the rotation preventing protrusion 165 and the free end thereof is held in contact with the second bending piece 165b. Therefore, the support bracket 170 is not rotated in the forward and reverse directions.

6A, since the first contact piece 167 and the second contact piece 179 are overlapped in the axial direction as shown in FIG. 6B, the lower surface of the first contact piece 167 and the lower surface 2 contact pieces 179 are in contact with each other. Since the embossing 167a is formed on the lower surface of the first contact piece 167, the embossing 167a is brought into close contact with the upper surface of the second contact piece 179 and the second contact piece 179 is pushed downward do. Then, since the support bracket 170 is supported downward, the cover 160 and the support bracket 170 do not flow in the axial direction but are firmly coupled.

When the support bracket 170 is to be removed, the free end side of the engagement protrusion 177 is lifted upward, and then the support bracket 170 is rotated in the counterclockwise direction.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, .

Description of the Related Art [0002]
110, 120: first and second stators 130: magnet
140: lead screw 150: motion transmitting member
160: Cover 170: Support bracket

Claims (16)

A stator including a housing and a bobbin;
A rotor disposed within the stator and including a magnet and a motion transmitting member;
A lead screw coupled with the rotor;
A cover coupled to the upper side of the housing;
A bearing disposed between the motion transmitting member and the cover; And
And a bracket disposed above the cover,
Wherein the bracket includes a first support tube and a second support tube that is smaller than the first support tube,
A first end surface (step surface) is formed between the first support tube and the second support tube,
Wherein the cover includes a coupling pipe disposed on a side surface of the bearing and a latching frame formed on an upper end of the coupling pipe,
Wherein the coupling tube is disposed in the first support tube, the coupling tube and the coupling stem are integrally formed, the coupling stem extends from the inner peripheral surface of the coupling tube and is disposed on the upper surface of the bearing,
An upper surface of the latching frame contacts the first end surface (step surface)
And the lower surface of the latching frame contacts the upper surface of the outer ring of the bearing. The method according to claim 1,
Wherein the motion transmitting member is disposed between the lead screw and the magnet,
Wherein the motion transmitting member includes a support surface formed on an outer peripheral surface of an upper end portion and a second end surface (step surface) formed on an outer peripheral surface of a central portion,
A second end surface (step surface) of the motion transmitting member is in contact with a lower surface of the bearing,
Wherein the support frame of the motion transmitting member is in contact with the upper surface of the inner ring of the bearing. A stator including a housing and a bobbin;
A rotor disposed within the stator and including a magnet and a motion transmitting member;
A lead screw coupled with the rotor;
A cover coupled to the upper side of the housing; And
And a bearing disposed between the motion transmitting member and the cover,
Wherein the motion transmitting member includes a support surface formed on an outer peripheral surface of an upper end portion and a second end surface (step surface) formed on an outer peripheral surface of a central portion,
Wherein the cover includes a stopper formed at a position corresponding to the support frame of the motion transmitting member and a stopper formed at a position corresponding to the second end face (step face) of the motion transmitting member,
And the outer ring of the bearing is disposed between the stopper and the stopper of the cover. 3. The method of claim 2,
Wherein an outer peripheral surface of the motion transmitting member is coupled to an inner peripheral surface of the magnet,
Wherein a screw thread is formed to be engaged with the inner peripheral surface of the motion transmitting member and the outer peripheral surface of the lead screw. 5. The method of claim 4,
Wherein the motion transmitting member has the screw thread formed on a part of the lower side of the second end face (step face)
Wherein the inner peripheral surface of the threaded region of the motion transmitting member is smaller than the inner peripheral surface of the threaded region. The method of claim 3,
Wherein the cover includes a coupling tube disposed on a side surface of the bearing,
And the stopper, the coupling pipe, and the stopper are in contact with the bearing. The method of claim 3,
The stopper is composed of at least two or more,
And the stopper contacts the lower surface of the bearing. The method according to claim 1,
Wherein the cover includes a coupling frame for coupling with the housing and a projection projecting from the coupling frame,
And the protrusion is engaged with the bracket to prevent rotation of the bracket. 9. The method of claim 8,
And the bracket is detachably coupled to the cover. 9. The method of claim 8,
And the coupling pipe extends in the vertical direction on the inner peripheral surface of the coupling frame. The method according to claim 1,
And the outer circumferential surface of the coupling tube is in contact with the inner circumferential surface of the first support tube. delete A stator including a housing and a bobbin;
A rotor disposed within the stator and including a magnet and a motion transmitting member;
A lead screw coupled with the rotor;
A cover coupled to the housing;
A bearing disposed between the motion transmitting member and the cover; And
And a bracket disposed on the cover,
Wherein the bracket includes a first support tube and a second support tube that is smaller than the first support tube,
A first end surface (step surface) is formed between the first support tube and the second support tube,
Wherein the cover includes a coupling frame and a coupling pipe extending from the coupling frame, and a latching frame formed on an upper end of the coupling pipe,
Wherein the coupling tube is disposed in the first support tube,
The latching frame is disposed so as to correspond to the first end face (stepped face)
Wherein the coupling tube and the latching frame are integrally formed, the latching frame extends from the inner circumferential surface of the coupling tube to the upper side of the bearing,
Wherein the upper surface of the retaining frame contacts the first end surface (step surface), the lower surface of the retaining frame contacts the upper surface of the outer ring of the bearing,
Wherein the cover includes a projection projecting from the coupling frame,
And the protrusion is engaged with the bracket to prevent rotation of the bracket. 14. The method of claim 13,
Wherein the motion transmitting member is disposed between the lead screw and the magnet,
Wherein the motion transmitting member includes a support surface formed on an outer peripheral surface of an upper end portion and a second end surface (step surface) formed on an outer peripheral surface of a central portion,
The second end face (stepped surface) of the motion transmitting member is in contact with the lower surface of the bearing,
Wherein the support frame of the motion transmitting member is in contact with the upper surface of the inner ring of the bearing. A stator including a housing and a bobbin;
A rotor disposed within the stator and including a magnet and a motion transmitting member;
A lead screw coupled with the rotor;
A cover coupled to the upper side of the housing; And
And a bearing disposed between the motion transmitting member and the cover,
Wherein the motion transmitting member includes a support surface formed on an outer peripheral surface of an upper end portion and a second end surface (step surface) formed on an outer peripheral surface of a central portion,
Wherein the cover includes a coupling frame, a coupling tube extending from the coupling frame, a latching frame formed at a position corresponding to the support frame of the movement transmitting member, and a second end face And a stopper formed in the position,
And the outer ring of the bearing is disposed between the stopper and the stopper of the cover. 14. The method of claim 13,
And the bracket is detachably coupled to the cover.

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