JP4566826B2 - Electric actuator - Google Patents

Description

  The present invention relates to an electric actuator that drives a driven member using an electric motor as a driving source.

  The electric actuator that drives the driven member using an electric motor as a driving source includes a direct acting type that reciprocates the output shaft and table in a linear direction, and a swing that reciprocates the output shaft and disk within a predetermined swing range. Dynamic type and rotary type that drives the output shaft to rotate. As described in Patent Document 1, a linear motion type electric actuator that converts a rotary motion of an electric motor into a linear reciprocating motion of an output shaft and transmits the linear motion to the output shaft is coupled to the output shaft as a screw shaft. There are a type in which the nut is driven by an electric motor, and a type in which a belt connected to a table is driven by an electric motor as described in Patent Document 2. Among the swing type electric actuators, there is one in which the output shaft swings and reciprocates via a speed reduction mechanism.

In these electric actuators, an electric motor as a power source and output members such as an output shaft, a table, and a disc are incorporated into a casing, that is, a case, and are unitized to form a workpiece or a jig. In order to drive a driven member such as the like, it is mounted on various assembling apparatuses and manufacturing apparatuses.
JP 2005-83444 A JP-A-8-226514

  In the case of the electric actuator, there are attached a cable for supplying electric power to the electric motor inside the cable, a cable for sending a signal from a sensor for detecting the position of the output member, and the like. Usually bundled and connected to a control unit or a power supply unit. The cable is usually attached to the case so as to be drawn out from the back surface or side surface of the case of the electric actuator. For this reason, for example, when the electric actuator is mounted on the above-described assembly apparatus, it is necessary to wind the cable around a specific position of the assembly apparatus. However, depending on the positional relationship between the assembling apparatus and the control unit, the layout of the electric actuator and the assembling apparatus may need to be changed in order to avoid interference between the cable and other members. Thus, depending on the type and structure of the device on which the electric actuator is mounted, the electric actuator cannot be mounted as it is, and the structure and shape on the device side may have to be changed.

  On the other hand, when manufacturing an electric actuator, preparing a plurality of cases according to the position where the cable is attached according to the type of device on which the electric actuator is mounted, increases the type of electric actuator, The manufacturing process becomes complicated and increases the manufacturing cost.

  An object of the present invention is to make it possible to easily change the position of a cable attached to a case of an electric actuator.

The electric actuator of the present invention is an electric actuator that drives a driven member using an electric motor that rotationally drives a motor shaft as a drive source, and the output member that is driven by the electric motor and drives the driven member; The first cable lead-out wall of the case is formed with a first opening, and the second cable lead-out wall forms a predetermined angle with respect to the first cable lead-out wall. Forming a second opening that is continuous with the first opening, abutting against one of the cable drawing walls and covering the one opening; and a first cable attaching piece to form a cable attachment member which is attached to the casing by a second cable attachment piece covering is abutted against the cable lead-out wall of the other integrally provided other of said openings, When the cable mounting body is mounted on the case, a protrusion that enters the opening and guides the cable mounting body to the mounting position is provided on the inner surface of the cable mounting body. And a second female screw member is provided inside the other cable lead-out wall, and the first cable mounting piece is abutted against one of the cable lead-out walls. A male screw member that is screw-coupled to the screw hole of the second female screw member and is screwed to the screw hole of the second female screw member in a state where the first cable mounting piece is abutted against the other cable lead-out wall A screw mounting hole is formed in the first cable mounting piece, and the second cable mounting piece is engaged with the case in a state of being abutted against the other cable lead-out wall. An engagement claw that engages with the case under a state in which the second cable mounting piece is abutted against one of the cable drawing walls is formed on the second cable mounting piece, and the electric motor A cable attachment hole through which a cable for supplying electric power passes is formed in one of the first cable attachment piece and the second cable attachment piece, and the position of the cable attachment hole is positioned between the first cable lead-out wall and the first cable attachment piece . It can be set to any of the two cable drawing walls.

In the electric actuator according to the present invention, the screw hole of the first female screw member and the screw hole of the second female screw member are connected to a wall boundary between the first cable lead wall and the second cable lead wall. It is characterized by being set at the same distance from the edge .

  In the electric actuator according to the present invention, the first cable lead-out wall is the back surface of the case, and the second cable lead-out wall is any one of the four side surfaces that are connected at a right angle to the back surface. It is characterized by.

  According to the present invention, the energization cable for supplying electric power to the electric motor incorporated in the electric actuator passes through the case and is drawn out to the two cable lead walls constituting the case. By reversing the direction of the two cable mounting pieces to be abutted, the cable arrangement of the electric actuator can be changed between a type in which the cable is extended from one cable extraction wall and a type in which the cable is extended from the other cable extraction wall. . Thus, by manufacturing one type of electric actuator, two types of electric actuators having different cable arrangements can be obtained.

  According to the present invention, when interference between the cable and other members occurs when the mounting position of the electric actuator with respect to the assembly apparatus or manufacturing apparatus is changed, the same electric actuator can be left as it is by changing the cable feeding surface. It can be used for assembly equipment and the like.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1A is a perspective view showing the electric actuator in a state where the cable is pulled out from the back surface of the case, and FIG. 1B is a perspective view showing the electric actuator in a state where the cable is drawn out from the side surface of the case. 2 is a cross-sectional view taken along line 2-2 in FIG. 1A, and FIG. 3 is a front view of the electric actuator viewed from the direction of arrow 3 in FIG.

  The electric actuator 10 has a base plate 11 as shown in FIG. 2, and an electric motor 13 is attached to the back side of the support plate 12 fixed to the base plate 11, and a speed reducer 14 is attached to the front side. ing. The speed reducer 14 has an output shaft 16 that decelerates and outputs the rotation of the motor shaft 15 of the electric motor 13, and the output shaft 16 projects toward the front of the electric actuator 10, and is within a predetermined angle range by the electric motor 13. Oscillating reciprocating motion or continuously rotating in the forward direction or the reverse direction.

  A cylindrical rotary block 17 as an output member is attached to the output shaft 16 with a plurality of bolts 18, and a jig or tool as a driven member is attached to the rotary block 17 as shown in FIG. A plurality of mounting holes 19 are provided. Each attachment hole 19 is formed with a female screw, and a bolt for attaching the driven member to the rotary block 17 is screwed to each female screw.

  In order to detect the origin position in the rotation direction of the output shaft 16, a disk 21 is fixed to the output shaft 16, and an origin sensor 22 having a light emitting element and a light receiving element is attached to the base plate 11, and irradiation from the light emitting element is performed. When the emitted light passes through the through hole formed in the disk 21 and reaches the light receiving element, the origin position of the output shaft 16 is detected by a signal from the origin sensor 22. As shown in FIG. 2, an encoder 23 is attached to the electric motor 13, and the encoder 23 detects the rotation angle and the number of rotations of the motor shaft 15.

  A motor cover 24 and an output shaft cover 25 are attached to the base plate 11. As shown in FIGS. 1 and 2, the motor cover 24 includes a back wall 24a, left and right side walls 24b and 24c that are substantially perpendicular to each other and face each other, and the back wall 24a and the left and right side walls. And an upper surface wall 24d substantially perpendicular to the walls 24b and 24c. The output shaft cover 25 has left and right side walls 25a and 25b, an upper surface wall 25c, and a front wall 25d. Each cover 24, 25 and the base plate 11 constitute a case 26 of the electric actuator 10, and the electric motor 13 and the speed reducer 14 are accommodated in the case 26.

  As shown in FIG. 2, the electric motor 13 is connected with an energizing cable 27 for supplying electric power thereto, and the origin sensor 22 is used for a signal for sending a detection signal to an external control unit. A cable 28 is connected, and a signal cable 29 for sending a detection signal to an external control unit is connected to the encoder 23. These cables 27 to 29 are bundled, and their respective ends are connected to external connectors (not shown).

  4 is an enlarged perspective view showing a part of the case 26 shown in FIG. 1, FIG. 5 is a plan view showing the cable mounting body 32 shown in FIG. 4, and FIG. It is an expanded sectional view which follows the 6A-6A line in Drawing 1 (A), and Drawing 6 (B) is an expanded sectional view which follows the 6B-6B line in Drawing 1 (B).

  As shown in FIG. 4, the back wall 24a of the motor cover 24 constituting the case 26 is a first cable lead wall. An opening 31a is formed in the back wall 24a as a first opening, and the opening 31a extends in the horizontal direction in FIG. 4 and extends to the boundary between the back wall 24a and one side wall 24b. It has become. A side wall 24b that is substantially perpendicular to the back wall 24a is a second cable drawing wall, and an opening 31b is formed in the side wall 24b as a second opening. 4 extends in the horizontal direction and continues to the opening 31a. Therefore, an L-shaped opening or notch is formed at the corner of the motor cover 24 by the openings 31a and 31b.

  An L-shaped cable mounting body 32 is detachably mounted on the case 26, and the cable mounting body 32 has a back wall 24a as a first cable leading wall and a second cable leading wall. A first cable mounting piece 32a that selectively abuts against either one of the side walls 24b and covers one opening, and a first cable attachment piece 32a that selectively abuts against either one and covers the other opening. 2 cable mounting pieces 32b. 6A shows a state where the cable mounting piece 32a is abutted against the back wall 24a to cover the opening 31a, and the cable mounting piece 32b is abutted to the side wall 24b to cover the opening 31b. (B) shows a state where the cable mounting piece 32a is abutted against the side wall 24b and covers the opening 31b, and the cable mounting piece 32b is abutted against the back wall 24a and covers the opening 31a.

  As shown in FIG. 4, the cable attachment piece 32 a is formed with a cable attachment hole 33 through which the bundling cable 30 formed by bundling the cables 27 to 29 and the male screw member 34 penetrates. A screw attachment hole 35 is formed. A flange 36 projects from the outer surface of the cable attachment piece 32 a, and the inside of the flange 36 is a cable attachment hole 33. However, the cable attachment hole 33 may be formed in one cable attachment piece 32a, and the screw attachment hole 35 may be formed in the other cable attachment piece 32b.

  As shown in FIG. 5, a projection 37 is provided on the inner surface of the cable mounting body 32 so as to enter the openings 31 a and 31 b when the cable mounting body 32 is mounted on the case 26. The width of the projection 37 is set to be slightly smaller than the width of each opening 31a, 31b as shown in FIG. 4 when the cable mounting body 32 is mounted on the case 26. It has a function to guide the mounting position. As shown in FIG. 5, an engagement claw 38 that engages the case 26 at the engagement end portion of the openings 31 a and 31 b is provided on the cable attachment piece 32 b side of the protrusion 37.

  A female screw member 40a in which a screw hole 39a is formed is provided inside the back wall 24a, and a female screw member 40b in which a screw hole 39b is formed is provided inside the side wall 24b, as shown in FIG. The distance D from the wall boundary edge 41 of each screw hole 39a, 39b is set to be the same. Therefore, for example, as shown in FIG. 4, when the cable mounting body 32 is mounted on the case 26 so as to cover the opening 31a by abutting the cable mounting piece 32a against the back wall 24a, the protrusion 37 is opened to the opening. After the engaging claw 38 is engaged with the case 26 so as to be slid into 31b, the male screw member 34 is screwed into the screw hole 39a. Under this state, the screw hole 39b is covered with the cable mounting piece 32b and is not observed from the outside. When the cable mounting body 32 is attached to the case 26 in this way, the cable attachment hole 33 is arranged on the back wall 24a side as shown in FIG. 6A, and the binding cable 30 is rearward from the back side of the electric actuator 10. It will be paid out.

On the other hand, as shown in FIG. 6B, when the cable attachment body 32 is attached to the case 26 so that the cable attachment piece 32a abuts against the side wall 24b to cover the opening 31b, the protrusion 37 is provided. After the engaging claw 38 is engaged with the case 26 so as to be slid into the opening 31a, the male screw member 34 is screwed into the screw hole 39b. Under this state, the screw hole 39a is not to be observed from the outside is covered by a cable attachment piece 32 b.

  As described above, the cable mounting body 32 formed integrally with the cable mounting pieces 32a and 32b having a substantially right angle corresponding to the back wall 24a and the side wall 24b having a substantially right angle includes the two walls 24a, 24b can be attached to the case 26 such that one of the cable attachment pieces is abutted against the selected wall, so that the position of the cable attachment hole 33 provided in the one cable attachment piece Can be set to either the back wall 24a or the side wall 24b. Therefore, when the electric actuator 10 is used, the feeding direction of the bundling cable 30 of the same electric actuator 10 and the direction of the cable mounting body 32 are reversed depending on the assembly apparatus and manufacturing apparatus on which the electric actuator 10 is mounted. By doing so, one of the two walls 24a and 24b can be set, and two types of electric actuators 10 with different cable feeding directions can be obtained by the same electric actuator 10. Further, when it is necessary to change the feeding position of the bundling cable 30 when changing the mounting position of the electric actuator 10, the feeding position of the bundling cable 30 can be easily achieved by reversing the direction of the cable mounting body 32. Can be changed.

  When the cable attachment hole 33 is formed in one cable attachment piece 32a and the screw attachment hole 35 is formed in the other cable attachment piece 32b, the projection 37 is formed on the cable attachment piece 32a on which the cable attachment hole 33 is formed. And the engaging claw 38 are formed. It is also possible to form the screw mounting holes 35 in the respective cable mounting pieces 32a and 32b. In this case, the engaging claws 38 are unnecessary, but two male screw members are required. On the other hand, the screw mounting hole 35 is formed in one cable mounting piece 32a and the engaging claw 38 is formed on the inner surface of the other cable mounting piece 32b as in the present invention, so that one male screw member 34 can reduce the L. The character-shaped cable mounting body 32 can be fixed to the case 26. An opening may be formed in the cable mounting body 32 so as to abut against the back wall 24a and the side wall 24c, and an opening may be formed in the back wall 24a and the top wall 24d. Alternatively, an opening may be formed in one of the side walls 24b and 24c so as to abut against the top wall 24d.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the electric actuator 10 shown in the figure is of a type in which the output shaft 16 and the rotating block 17 are reciprocally oscillated within a predetermined oscillating range or are continuously rotated in the forward or reverse direction. The present invention can be applied to a linear motion type electric actuator that reciprocates an output shaft and a table in a linear direction as long as the electric actuator and an output member driven thereby are accommodated in a case. Can be applied.

  The case 26 shown in the figure has a rectangular parallelepiped shape as a whole, and the walls constituting the case 26 adjacent to each other are adjacent to each other at substantially right angles, but adjacent to each other at angles other than the right angle. The present invention can also be applied to the case where the cable mounting body 32 is mounted so as to abut against two matching walls.

  The illustrated electric actuator 10 has an origin sensor 22, and an energization cable 27, a signal cable 28 for the origin sensor 22, and a signal cable 29 for the encoder 23 are bundled outside the case 26. If the origin sensor 22 and the encoder 23 are not provided, but only the cable 27 for energizing the electric motor is delivered to the outside, the origin sensor 22 is not provided and the encoder is provided. When 23 is provided, the energizing cable 27 and the signal cable 29 are extended to the outside. In any case, the cable mounting body 32 of the present invention can be used.

(A) is a perspective view which shows the electric actuator in the state where the cable was pulled out from the back surface of a case, (B) is a perspective view which shows the electric actuator in the state where the cable was pulled out from the side surface of the case. It is sectional drawing which follows the 2-2 line in FIG. It is a front view of the electric actuator seen from the arrow 3 direction in FIG. It is a perspective view which expands and shows a part of case shown by FIG. It is a top view which shows the cable mounting body shown by FIG. (A) is an expanded sectional view which follows the 6A-6A line in FIG. 1 (A), (B) is an expanded sectional view which follows the 6B-6B line in FIG. 1 (B).

Explanation of symbols

11 Base plate 12 Support plate 13 Electric motor 14 Reduction gear 15 Motor shaft 16 Output shaft 17 Rotating block 21 Disk 22 Origin sensor 23 Encoder 24 Motor cover 24a Rear wall (cable drawing wall)
24b Side wall (cable drawer wall)
25 Output shaft cover 26 Case 30 Bundling cables 31a, 31b Opening 32 Cable mounting bodies 32a, 32b Cable mounting pieces 33 Cable mounting holes 34 Male screw members 35 Screw mounting holes 36 Flange 37 Projections 38 Engaging claws 39a, 39b Screw holes 40a, 40b Female thread member 41 Wall boundary edge

Claims (3)

An electric actuator that drives a driven member using an electric motor that rotates and drives a motor shaft as a drive source,
A case for accommodating the electric motor and an output member driven thereby to drive the driven member;
A first opening is formed in the first cable lead-out wall of the case, and a second cable lead-out wall formed at a predetermined angle with respect to the first cable lead-out wall is connected to the first opening. 2 openings are formed,
A first cable mounting piece that is abutted against one of the cable leading walls and covers one of the openings; and a first cable mounting piece that is provided integrally with the first cable mounting piece and is abutted against the other cable leading wall Forming a cable mounting body to be mounted on the case with a second cable mounting piece covering the opening of
Providing a protrusion on the inner surface of the cable mounting body that enters the opening when guiding the cable mounting body to the case and guides the cable mounting body to a mounting position;
A first female screw member is provided inside one of the cable lead walls and a second female screw member is provided inside the other cable lead wall;
The first cable mounting piece is screwed into the screw hole of the first female screw member in a state where the first cable mounting piece is abutted against one of the cable lead-out walls, and the first cable mounting piece is connected to the other cable. Forming a screw mounting hole in the first cable mounting piece through which the male screw member threadedly coupled to the screw hole of the second female screw member in a state of being abutted against the drawer wall;
The second cable mounting piece was engaged with the case in a state of being abutted against the other cable lead wall, and the second cable mounting piece was abutted against one of the cable lead walls. An engagement claw that engages with the case under the condition is formed on the second cable mounting piece;
Forming a cable attachment hole through which a cable for supplying power to the electric motor passes, in one of the first cable attachment piece and the second cable attachment piece;
The electric actuator characterized in that the position of the cable attachment hole can be set to either the first cable lead wall or the second cable lead wall. The electric actuator according to claim 1, wherein the screw hole of the first female screw member and the screw hole of the second female screw member are connected to the first cable lead wall and the second cable lead wall. An electric actuator characterized by being set at the same distance from the wall boundary edge . 3. The electric actuator according to claim 1 , wherein the first cable lead-out wall is a back surface of the case, and the second cable lead-out wall is connected to the back surface at a substantially right angle. An electric actuator characterized by having a side surface.

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