JP6574956B2 - Linear motion actuator using worm gear and linear motion method thereof - Google Patents

Description

  The present invention relates to a linear motion actuator using a worm gear and a linear motion method thereof, and more particularly, to a novel improvement for linear motion while rotating a shaft by orthogonal transformation using a pair of worm gears, spur gears, and worm wheels.

Conventionally used linear actuators of this type include, for example, the configuration disclosed in Patent Document 1.
That is, as shown in FIGS. 5 and 6, for example, a linear actuator for furniture adjustment includes a housing 1 with a reversible electric motor 2, and the motor is a force absorbing bearing via transmissions 11 and 13. The spindle 4 with 16 is driven. There is a nut 5 on the spindle 4 to which an actuating rod 6 surrounded by an outer tube 7 is fixed. The actuator includes an operation lock 6 and a rear mount, and the actuator is built in the rear mount. The motor housing is a part of the support structure, and the console is fixed to the motor housing by the outer tube 7, the spindle bearing, and the rear mounting fixture, and is designed to absorb the force generated there.

JP-T-2004-511194

Since the conventional linear actuator is configured as described above, the following problems exist.
That is, since a plurality of transmission devices, nuts, force absorbing bearings, and the like are required, the number of parts is increased and the number of assembly steps is also increased.
In addition, since the overall shape is a pistol type, the operating rod will appear only on one side, only the mount on the rear end side, and the operating rod will penetrate both sides of the outer tube, and the operating rod will be used on both sides. It was impossible to do.
Although not shown in the figure, conventionally, an orthogonal conversion gear that rotates the worm wheel when the worm gear is rotated using a combination of a worm gear and a worm wheel is generally used. The mechanism was not developed.
Further, as another conventional configuration, a rack and a ball screw mechanism can be used. However, when attachment parts such as a motor are attached, the structure becomes complicated and it is difficult to reduce the size.

  The present invention has been made to solve the above-described problems, and in particular, performs rotation / linear motion conversion in which a pair of worm gears, spur gears, and worm wheels are used to linearly move while rotating a shaft by orthogonal transformation. It is an object of the present invention to provide a linear motion actuator using the worm gear and a linear motion method thereof.

  A linear motion actuator using a worm gear according to the present invention includes a servo motor provided in a frame, a first worm gear rotatably provided in the frame and connected to a rotation shaft of the servo motor, and the frame. A shaft that is rotatably and linearly movable and is positioned along a second axial direction orthogonal to the first axial direction of the first worm gear; and a spur gear that is provided on the shaft and meshes with the first worm gear; A second worm gear provided on the shaft and spaced apart from the spur gear; and an axial direction along the first axial direction provided in the frame and orthogonal to the second axial direction. A rotation of the first worm gear that is rotated by the servo motor is orthogonally transformed via the spur gear, the shaft rotates, and the second worm gear that rotates together with the shaft. When the gear is meshed with the fixedly arranged worm wheel, the shaft is configured to move linearly along the second axial direction while rotating, and at the end of the shaft, A connecting member having a concave cross section is provided, and the connecting member does not rotate with respect to the shaft, and both end portions of the shaft penetrate and project outward from both side plates of the frame body. Further, the both side plates are provided with bearings made of ball splines, the shafts are configured to penetrate the bearings, and the linear actuator using the worm gear according to the present invention The linear motion method includes a servo motor provided in a frame, a first worm gear rotatably provided in the frame and connected to a rotation shaft of the servo motor, and being rotatable and linearly movable on the frame. Provided, before A shaft positioned along a second axial direction orthogonal to the first axial direction of the first worm gear; a spur gear provided on the shaft and meshing with the first worm gear; provided on the shaft; A second worm gear positioned away from the gear, and a worm wheel provided in the frame and having an axial direction along the first axial direction perpendicular to the second axial direction. The rotation of the first worm gear rotated by the motor is orthogonally transformed via the spur gear, the shaft rotates, and the second worm gear rotating together with the shaft meshes with the fixedly arranged worm wheel. The shaft is a method of linearly moving along the second axial direction while rotating, and a connecting member having a concave cross section is provided at an end of the shaft, Above It is a method that does not rotate with respect to the shaft, and both end portions of the shaft are a method of penetrating and projecting outward from both side plates of the frame body. A bearing comprising a ball spline is provided, and the shaft penetrates the bearings.

Since the linear motion actuator using the worm gear and the linear motion method according to the present invention are configured as described above, the following effects can be obtained.
That is, a combination of the first worm gear and the spur gear and a combination of the second worm gear and the worm wheel can be reduced in two stages, and a linear actuator having a simple structure can be obtained at a large speed.
Further, the speed reduction structure described above makes it possible to maintain the shaft insulation position even when an abnormality occurs such as when the motor is stopped or the system is down.
In addition, since the connecting member connected to the end of the shaft is configured not to rotate with respect to the shaft, the connecting member can only move linearly along the second axial direction without rotating.

It is sectional drawing which shows the linear motion actuator using the worm gear by this invention. It is a plane block diagram of the principal part of FIG. It is a right view of FIG. It is a left view of FIG. It is an external view which shows a conventional structure. It is AA sectional drawing of FIG.

  An object of the present invention is to provide a linear motion actuator using a worm gear that uses a pair of worm gears, a spur gear, and a worm wheel and that rotates linearly by orthogonal transformation and a linear motion method thereof. .

Hereinafter, preferred embodiments of a linear motion actuator using a worm gear and a linear motion method thereof according to the present invention will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
In FIG. 1, what is denoted by reference numeral 1 is a rectangular frame whose overall shape is a box or a frame, and a servo motor 2 is provided on a top plate 1a as seen in the figure of the frame 1, and this servo The motor 2 is configured so that its rotation operation can be accurately controlled by a known control unit 100.

The pair of side plates 1b and 1c provided on both sides of the frame 1 are provided with bearings 16 and 17 made of ball splines, respectively.
Between the side plates 1b and 1c, a single shaft 6 is disposed so as to protrude through the bearings 16 and 17, and can move linearly along the second axial direction B while rotating. It is configured as follows.

Both ends of the shaft 6, that is, the end portions 6 a and 6 b are positioned so as to penetrate the bearings 16 and 17 and to protrude outside the bearings 16 and 17 and the side plates 1 b and 1 c.
The end portions 6a and 6b are fitted with connecting members 6A and 6B having a concave cross section, and the end portions 6a and 6b are connected to each other even when the shaft 6 is rotating (spinning) and moving linearly. It is comprised so that surfaces may idle in hole part 6aA, 6bB. Accordingly, each of the connecting members 6A and 6B is configured to be able to move linearly along the second axial direction B in a non-rotating state without rotating with respect to the shaft 6.

A spur gear 70 and a second worm gear 71 are disposed on the shaft 6 while being separated from each other by a predetermined distance.
A rotary shaft 2A of the servo motor 2 extends along a first axial direction A orthogonal to the second axial direction B of the shaft 6, and a first worm gear 72 provided on the rotary shaft 2A is It meshes with the spur gear 70.

  As shown in FIG. 2, the spur gear 70 and the first worm gear 72 have their rotations orthogonally converted by the rotation of the first worm gear 72 meshing with the spur gear 70, and The shaft 6 is configured to rotate (spin) by the rotation of the worm gear 72.

The lower surface 1aA of the top plate 1a of the frame 1, the shaft 74 having a rotatable U O Muhoiru 73 is fixed, the worm wheel 73 meshes with the second worm gear 71.
By rotating together with the shaft 6 in a state where the second worm gear 71 is meshed with the worm wheel 73, the worm wheel 73 is fixedly der because the frame 1, the shaft 6 second while rotating the It is configured to be rotatable and linearly movable so that it can linearly move along the axial direction B. Accordingly, as described above, when the shaft 6 moves linearly, the spur gear 70 slides with respect to the first worm gear 72.

  Accordingly, in the configuration described above, when the rotation shaft 2A of the servo motor 2 is rotated via the control unit 100, the rotation of the rotation shaft 2A is orthogonally converted via the first worm gear 72 and the spur gear 70. Then, the shaft 6 rotates, and the rotation of the shaft 6 is converted into the linear motion of the shaft 6 through the second worm gear 71 and the worm wheel 73, thereby obtaining the linear motion of the shaft 6. it can.

The gist of the linear motion actuator using the worm gear and the linear motion method according to the present invention is as follows.
That is, the servo motor 2 provided in the frame 1, the first worm gear 72 rotatably provided in the frame 1 and connected to the rotation shaft 2 A of the servo motor 2, A shaft 6 provided along the second axial direction B perpendicular to the first axial direction A of the first worm gear 72 and provided on the shaft 6 and meshed with the first worm gear 72. A spur gear 70, a second worm gear 71 provided on the shaft 6 and spaced apart from the spur gear 70, and provided in the frame 1, and orthogonal to the second axial direction B A worm wheel 73 having an axial direction along the first axial direction A, and the rotation of the first worm gear 72 rotated by the servo motor 2 is orthogonally transformed via the spur gear 70 to be converted into the shaft 6. The shaft rotates The second worm gear 71 that rotates together with the fixedly arranged worm wheel 73 meshes with the worm wheel 73 so that the shaft 6 rotates in a straight line along the second axial direction B while rotating. In addition, connection members 6A and 6B having concave cross sections are provided at the end portions 6a and 6b of the shaft 6, and the connection members 6A and 6B are configured so as not to rotate with respect to the shaft 6. Further, both end portions 6a and 6b of the shaft 6 have a configuration and a method of penetrating and projecting outward from both side plates 1b and 1c of the frame 1, and the both side plates 1b and 1c The bearings 16 and 17 made of ball splines are provided, and the shaft 6 penetrates the bearings 16 and 17.

  The linear motion actuator using the worm gear and the linear motion method according to the present invention can be linearly moved while rotating the shaft, and can be manufactured inexpensively with a simple structure.

DESCRIPTION OF SYMBOLS 1 Frame 1a Top plate 1b, 1c Side plate 1aA Lower surface 2 Servo motor 2A Rotating shaft 6 Shaft 6A, 6B Connection member 6aA, 6bB Hole part 16, 17 Ball spline (bearing)
A First axial direction B Second axial direction 70 Spur gear 71 Second worm gear 72 First worm gear 73 Worm wheel 74 Shaft body

Claims (8)

The servo motor (2) provided on the top plate (1a) of the frame (1) having both side plates (1b, 1c), and the servo motor (2) provided rotatably in the frame (1). A first worm gear (72) connected to a rotating shaft (2A), and a frame (1) that is rotatably and linearly movable and orthogonal to the first axial direction (A) of the first worm gear (72). A shaft (6) positioned along the second axial direction (B), a spur gear (70) provided on the shaft (6) and meshing with the first worm gear (72), and the shaft (6 ) And a second worm gear (71) which is located apart from the spur gear (70), and is provided in the frame (1) and orthogonal to the second axial direction (B). A worm wheel (73) having an axial direction along the first axial direction (A),
The rotation of the first worm gear (72) rotated by the servo motor (2) is orthogonally transformed through the spur gear (70) to rotate the shaft (6) and rotate together with the shaft (6). The second worm gear (71) meshes with the fixedly arranged worm wheel (73), so that the shaft (6) rotates and linearly moves along the second axial direction (B). A linear motion actuator using a worm gear characterized by The end portions (6a, 6b) of the shaft (6 ) that penetrate the both side plates (1b, 1c ) are provided with connection members (6A, 6B) having a concave cross section, and the connection members (6A, 6B) The linear motion actuator using a worm gear according to claim 1, wherein the linear motion actuator does not rotate with respect to the shaft (6). Both end portions (6a, 6b) of the shaft (6), the side plates (1b, 1c) according to claim 1 or 2, characterized in that through-projecting outward from the frame (1) Linear actuator using worm gear.   The both side plates (1b, 1c) are provided with bearings (16, 17) made of ball splines, and the shaft (6) passes through the bearings (16, 17). A linear actuator using the worm gear according to any one of claims 1 to 3. The servo motor (2) provided on the top plate (1a) of the frame (1) having both side plates (1b, 1c), and the servo motor (2) provided rotatably in the frame (1). A first worm gear (72) connected to a rotating shaft (2A), and a frame (1) that is rotatably and linearly movable and orthogonal to the first axial direction (A) of the first worm gear (72). A shaft (6) positioned along the second axial direction (B), a spur gear (70) provided on the shaft (6) and meshing with the first worm gear (72), and the shaft (6 ) And a second worm gear (71) which is located apart from the spur gear (70), and is provided in the frame (1) and orthogonal to the second axial direction (B). A worm wheel (73) having an axial direction along the first axial direction (A),
The rotation of the first worm gear (72) rotated by the servo motor (2) is orthogonally transformed through the spur gear (70) to rotate the shaft (6) and rotate together with the shaft (6). The second worm gear (71) meshes with the fixedly arranged worm wheel (73), so that the shaft (6) rotates and linearly moves along the second axial direction (B). A linear motion method for a linear motion actuator using a worm gear. The end portions (6a, 6b) of the shaft (6 ) that penetrate the both side plates (1b, 1c ) are provided with connection members (6A, 6B) having a concave cross section, and the connection members (6A, 6B) 5. The linear motion method for a linear motion actuator using a worm gear according to claim 4, wherein the linear motion actuator does not rotate with respect to the shaft (6). Both end portions (6a, 6b) of the shaft (6), the side plates (1b, 1c) according to claim 5 or 6, characterized in that through-projecting outward from the frame (1) Of linear actuator using worm gear.   The both side plates (1b, 1c) are provided with bearings (16, 17) made of ball splines, and the shaft (6) passes through the bearings (16, 17). The linear motion method of the linear motion actuator using the worm gear of any one of Claim 5 thru | or 7.

Images