Actuator

Abstract

To provide an actuator which enables reduction of an installation area.SOLUTION: An actuator includes: an actuator main part which houses a screw shaft disposed at a center, a nut threadedly engaged with the screw shaft, a rod fixed to the nut, and guide rods which are disposed at both sides of the screw shaft and connected to the rod through a connection member to guide the rod; a motor case which is installed overlapping with the actuator main part and houses a motor; a controller case which is installed overlapping with the actuator main part and houses an electronic circuit board; and a folded member which is installed spanning the actuator main part and the motor case and houses a drive connection mechanism for transmitting power from the motor to the screw shaft. The motor case is installed offset to the side of one of the guide rods to cause an output shaft of the motor to be disposed offset to the side of the one of the guide rods relative to the center and cause the controller case to be disposed at the side of the other of the guide rods.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an actuator, and more particularly to an actuator that is designed to reduce the installation area. [Background technology]

[0002] For example, Patent Document 1 discloses a conventional actuator. The actuator described in Patent Document 1 has an actuator body in which a ball screw shaft is housed in the center in the width direction and guide rods are installed on both sides of the ball screw shaft in the width direction. A ball screw nut is threadedly engaged with the ball screw shaft within the actuator body, and a rod is fixed to the ball screw nut. The front ends of the rod and the guide rod protrude outside the actuator body, and the front ends of the rod and the guide rod are connected to a moving body.

[0003] The actuator has a motor case installed in the widthwise center, superimposed on the actuator body. A motor is housed in the motor case. A transmission mechanism case is installed behind the actuator, spanning the actuator body and the motor case. The transmission mechanism case houses a motor-side timing pulley fixed to the output shaft of the motor, a ball screw shaft-side timing pulley fixed to the ball screw shaft, and a timing belt wound around the motor-side timing pulley and the ball screw shaft-side timing pulley.

[0004] A circuit board case is installed behind the transmission mechanism case. A circuit board is housed in the circuit board case. An external interface connector and a power supply connector are also installed in the circuit board case. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-11233 Summary of the Invention [Problem to be solved by the invention]

[0006] The above conventional configuration has the following problems. In the actuator described in Patent Document 1, a circuit board case is installed behind the transmission mechanism case, which results in a large installation area.

[0007] The present invention has been made based on the above points, and an object of the present invention is to provide an actuator that can reduce the installation area. [Means for solving the problem]

[0008] In order to achieve the above object, the actuator according to claim 1 of the present invention comprises an actuator body that houses a centrally arranged screw shaft, a nut that is threaded onto the screw shaft, a rod that is fixed to the nut, and guide rods that are arranged on both sides of the screw shaft and are connected to the rod via connecting members to guide the rod, a motor case that is installed superimposed on the actuator body and houses a motor, a controller case that is installed superimposed on the actuator body and houses an electronic circuit board, and a folding member that is installed across the actuator body and the motor case and houses a drive connecting mechanism that transmits power from the motor to the screw shaft, and is characterized in that the motor and the motor case are installed offset to one side of the guide rods, so that the output shaft of the motor is positioned offset from the center to one side of the guide rods, and the controller case is located on the other side of the guide rods. Furthermore, the actuator according to claim 2 is the actuator according to claim 1, characterized in that the controller case does not protrude from the end of the actuator body. Furthermore, the actuator according to claim 3 is the actuator according to claim 1, characterized in that the controller case is provided with a connector opening through which a connector installed on the electronic circuit board is exposed, and the connector opening is provided on the side opposite the actuator body. Furthermore, the actuator according to claim 4 is the actuator according to claim 1, characterized in that a heat generating element is mounted on the electronic circuit board, and the heat generated by the heat generating element is dissipated through the motor case. Furthermore, the actuator according to claim 5 is the actuator according to claim 4, characterized in that the electronic circuit board includes a first electronic circuit board on which a heat generating element is mounted and a second electronic circuit board on which a CPU is installed, the first electronic circuit board being arranged on the motor case side and the second electronic circuit board being arranged on the opposite side of the motor case. Furthermore, the actuator according to claim 6 is the actuator according to claim 1, characterized in that the drive connecting mechanism is composed of a first pulley fixed to the output shaft of the motor, a second pulley fixed to the screw shaft, and a belt wound around the first pulley and the second pulley. [Effects of the Invention]

[0009] As described above, the actuator according to claim 1 of the present invention comprises an actuator body that houses a centrally arranged screw shaft, a nut that screws onto the screw shaft, a rod that is fixed to the nut, and guide rods that are arranged on both sides of the screw shaft and are connected to the rod via connecting members to guide the rod, a motor case that is installed superimposed on the actuator body and houses a motor, a controller case that is installed superimposed on the actuator body and houses an electronic circuit board, and a folding member that is installed across the actuator body and the motor case and houses a drive connecting mechanism that transmits power from the motor to the screw shaft, and by installing the motor and the motor case offset to one side of the guide rods, the output shaft of the motor is positioned offset from the center to one side of the guide rods, and the controller case is positioned on the other side of the guide rods, thereby making it possible to reduce the installation area. Furthermore, since the electronic circuit board is isolated and housed in the controller case, the electronic circuit board can be kept away from the drive unit, thereby reducing the influence of the drive unit on the electronic circuit board. According to the actuator of claim 2, since the controller case does not protrude from the end of the actuator body in the actuator of claim 1, the installation area can be further reduced. Furthermore, according to the actuator of claim 3, in the actuator of claim 1, the controller case is provided with a connector opening through which the connector installed on the electronic circuit board is exposed, and the connector opening is provided on the opposite side of the actuator body, making it easy to connect a cable to the connector. Furthermore, according to the actuator of claim 4, in the actuator of claim 1, a heat generating element is mounted on the electronic circuit board, and the heat generated by the heat generating element is dissipated through the motor case, thereby enabling effective heat dissipation. According to the actuator of claim 5, in the actuator of claim 4, the electronic circuit board includes a first electronic circuit board on which a heat generating element is mounted and a second electronic circuit board on which a CPU is installed, and the first electronic circuit board is disposed on the motor case side and the second electronic circuit board is disposed on the opposite side of the motor case, so that the electronic components mounted on the second electronic circuit board can be protected from the heat of the heat generating element. Furthermore, according to the actuator of claim 6, in the actuator of claim 1, the drive connecting mechanism is composed of a first pulley fixed to the output shaft of the motor, a second pulley fixed to the screw shaft, and a belt wound around the first pulley and the second pulley, making it easy to make design changes to change the positions of the motor case and motor. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of an actuator, showing an embodiment of the present invention. [Figure 2] FIG. 1 is a diagram showing an embodiment of the present invention, and is a plan view of an actuator. [Figure 3] FIG. 3 is a view showing an embodiment of the present invention, taken along the line III-III in FIG. 2. [Figure 4] FIG. 4 is a view showing an embodiment of the present invention, taken along the line IV-IV in FIG. 2. [Figure 5] 5A and 5B are diagrams showing an embodiment of the present invention, in which FIG. 5A is a view taken along the line Va-Va in FIG. 2, and FIG. 5B is a diagram showing a state in which the folding member cover of FIG. 5A has been removed. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 4, showing an embodiment of the present invention. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 4, showing an embodiment of the present invention. [Figure 8] 8A and 8B are diagrams showing an embodiment of the present invention, and are a cross-sectional view taken along line VIIIa-VIIIa in FIG. 3 and a cross-sectional view taken along line VIIIb-VIIIb in FIG. [Figure 9]FIG. 1 is an exploded perspective view of a controller case according to an embodiment of the present invention. [Figure 10] FIG. 1 is a diagram showing an embodiment of the present invention, illustrating a state in which an actuator is used. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5, the actuator 1 according to this embodiment includes an actuator main body 3, a folding member 5 connected to the rear of the actuator main body 3 (on the right side in FIG. 2), a motor case 7 connected to the folding member 5 and arranged on the upper side in FIG. 3 so as to overlap with the actuator main body 3, and a controller case 9 installed on the side of the motor case 7 on the upper side in FIG. 2. In this way, the actuator 1 has a folded structure in which the tip side of the motor case 7 is folded back toward the tip side of the actuator main body 3.

[0012] 6 and 7, for example, a ball screw shaft accommodating portion 10 extending in the axial direction (left-right direction in FIG. 7) is formed in the center in the width direction (up-down direction in FIG. 7) of the actuator main body 3. A connecting protrusion 11 is provided on the left side of the folding member 5 in FIG. 7, and the connecting protrusion 11 engages with the right side of the ball screw shaft accommodating portion 10 in FIG. 7.

[0013] A ball screw shaft 15 is rotatably installed in the ball screw shaft accommodating portion 10. As shown in Fig. 7, the base end side (right side in Fig. 7) of the ball screw shaft 15 is rotatably supported by the folding member 5 via a bearing 17.

[0014] 7, a ball screw nut 19 is threadedly engaged with the ball screw shaft 15. The ball screw nut 19 is held by a nut holder 20, and a rod 21 is fixed to the nut holder 20. The rod 21 is composed of a substantially cylindrical rod body 22 in which the ball screw shaft 15 is disposed, and an adapter 23 fixed to the tip of the rod body 22 (left side in FIG. 7). The rod 21 extends to the tip side (left side in FIG. 7) of the actuator body 3 and is slidably installed inside the ball screw shaft accommodating portion 10. A movable body 25 serving as a connecting member is connected to the tip side of the rod 21 via the adapter 23.

[0015] Guide rod accommodating sections 27, 27 are formed on both sides of the actuator main body 3 in the width direction (vertical direction in FIG. 7). Guide rods 29, 29 are slidably installed within the guide rod accommodating sections 27, 27. The left ends of the guide rods 29, 29 in FIG. 7 are connected to both ends of the moving body 25 in the width direction (vertical direction in FIG. 7). With this configuration, even when the ball screw shaft 15 is rotated, the ball screw nut 19, rod 21, and moving body 25 do not rotate, and the ball screw nut 19 moves back and forth in the left and right direction in FIG. 7, and ultimately the rod 21 moves back and forth in the left and right direction in FIG. 7 together with the guide rods 29, 29.

[0016] As shown in FIG. 6, the motor case 7 includes a cylindrical motor case body 28 and a motor case cover 30 that closes an opening on one side of the motor case body 28 (the left side in FIG. 6). For example, as shown in FIGS. 6 and 8, a motor 31 is housed inside the motor case 7, and an encoder 32 is installed behind the motor 31 (on the left side in FIG. 6) inside the motor case 7. The motor 31 is disposed on the upper side of the actuator body 3 in FIG. 6. A motor-side timing pulley 35 serving as a first pulley is fixed to the output shaft 33 of the motor 31. A ball-screw shaft-side timing pulley 37 serving as a second pulley is fixed to the right end of the ball screw shaft 15 in FIG. 6. A timing belt 39 is wound around the motor-side timing pulley 35 and the ball-screw shaft-side timing pulley 37. As shown in FIG. 5(b), a drive coupling mechanism 40 consisting of the motor-side timing pulley 35, the ball-screw shaft-side timing pulley 37, and the timing belt 39 is housed inside the folding member 5.

[0017] The folding member 5 has a folding member main body 34 that opens at the rear end side (the front side in the direction of the paper surface in FIG. 5) and an end cover 36 that closes the opening of the folding member main body 34. The end cover 36 is fixed by passing fixing screws 38 through the end cover 36 and screwing them into the folding member main body 34. The other opening side (right side in FIG. 6) of the motor case body 28 is fixed to the folding member body 34 .

[0018] As shown in Figure 5, the folding member 5 has a shape in which the side on which the motor case 7 is installed (upper side in Figure 5) is biased toward one of the guide rods 29 (left side in Figure 5) from the center in the width direction (left-right direction in Figure 5), and the motor case 7 and the motor 31 are positioned biased toward one of the guide rods 29 (left side in Figure 5) from the center in the width direction (left-right direction in Figure 5).

[0019] As shown in FIG. 9, the controller case 9 is composed of a controller case element 41 and a controller case element 43. The controller case 9 houses a motor driver board 45 as a first electronic circuit board, a rotation control board 47 as a second electronic circuit board, and a communication circuit board 49. A FET (Field Effect Transistor) 51, which is a heat generating element, is mounted on the motor driver board 45. A heat dissipation pad (not shown) is provided on the surface of the motor driver board 45 opposite to the surface on which the FET 51 is mounted, and a heat dissipation sheet 53 is attached to the heat dissipation pad (not shown). The rotation control board 47 is mounted with a teaching device connector 55, an external interface connector 57, and a CPU 46 that controls the motor driver board 45. The communication circuit board 49 also has a circuit mounted thereon for wireless communication with external devices.

[0020] As shown in FIG. 9, the controller case element 41 is provided with a motor case side opening element 59. A motor driver board mounting groove 61 is provided inside the controller case element 41 on both left and right sides in Fig. 9 near the motor case side opening element 59. A rotation control board supporting rib 63 is also provided inside the controller case element 41. An engagement protrusion 67 and a female thread portion 69 are provided on a dividing surface 65 on the upper side in Fig. 9 of the controller case element 41. Mounting through holes 71 are also provided on both left and right sides in Fig. 9 on the lower side of the controller case element 41.

[0021] The controller case element 43 is provided with a motor case side opening element 73 . An opening 75 for a teaching device connector and an opening 77 for an external interface connector are provided on the upper side of the controller case element 43 in Figure 9. In addition, the controller case element 43 is provided with an engaging recess (not shown) at a position corresponding to the engaging protrusion 67 of the controller case element 41. The controller case element 43 is provided with a through hole 81 for a fixing screw at a position corresponding to the female thread portion 69 of the controller case element 41. In addition, mounting through holes 83 are provided on both the left and right sides of the upper side of the controller case element 43 in Figure 9.

[0022] The controller case element 41 and the controller case element 43 are integrally configured as the controller case 9 by engaging the engaging protrusion 67 with the engaging recess (not shown) and passing a fixing screw 85 through the fixing screw through hole 81 and screwing it into the female thread portion 69. In addition, the controller case 9 is provided with a motor case side opening 87 formed by the motor case side opening element 59 and the motor case side opening element 73.

[0023] The motor driver board 45 is inserted into the motor driver board mounting groove 61 and is installed near the motor case side opening 87 in the controller case 9. The rotation control board 47 is installed in the controller case 9 with the tip (upper end in FIG. 9) of the teaching device connector 55 inserted into the teaching device connector opening 75, the tip (upper end in FIG. 9) of the external interface connector 57 inserted into the external interface connector opening 77, and the lower end in FIG. 9 of the rotation control board 47 abutting against the rotation control board support rib 63. The rotation control board 47 is also arranged on the side of the controller case 9 opposite the motor driver board 45. The controller case 9 is installed so that the opening 75 for the teaching device connector and the opening 77 for the external interface connector are located on the side opposite to the actuator main body 3 .

[0024] The controller case 9 is fixed to the right side of the motor case main body 28 in FIG. 5 by passing fixing screws 89 through the mounting through holes 71 and 83 and screwing them into the motor case main body 28. The heat dissipation sheet 53 of the motor driver board 45 is in contact with the motor case main body 28 through the motor case-side opening 87, so that heat generated by the motor driver board 45 is effectively dissipated through the motor case main body 28. Further, a wiring opening 90 is provided in the motor case main body 28. The wiring opening 90 is in communication with a motor case side opening 87 of the controller case 9. The motor 31 and the encoder 32 housed in the motor case main body 28 and the motor driver board 45 and the rotation control board 47 housed in the controller case 9 are connected by cables (not shown) via the wiring opening 90 and the motor case side opening 87.

[0025] As described above, the motor case 7 and the motor 31 are arranged offset toward one guide rod 29 side (left side in FIG. 5) from the center in the width direction (left-right direction in FIG. 5), so that the space necessary for the controller case 9 to be placed overlapping the actuator main body 3 and not protruding beyond the actuator main body 3 is secured. In addition, the size of the controller case 9 is set so that it does not protrude upward from the motor case 7 in FIG. 4. The actuator main body 3 is provided with a grease supply port 91, and the controller case 9 and the motor case 7 are arranged so as not to block the grease supply port 91. The grease supply port 91 is in communication with the guide rod accommodating portion 27.

[0026] Furthermore, as shown in Figure 8(a), the actuator body 3 is provided with grease supply passages 93 that communicate with the ball screw shaft accommodating portion 10 from both sides of the width direction (left and right direction in Figure 8(a)) of the ball screw shaft accommodating portion 10. When grease is supplied by inserting a jig (not shown) from one opening (the right side in FIG. 8(a)) on the exterior side of the grease supply path 93, a cutout portion 95 is provided to avoid interference between the jig (not shown) and the lower right portion in FIG. 8(a) of the motor case main body 28. Grease is supplied from the opening (the right side in FIG. 8(a)) on the exterior side of the grease supply path 93 through a gap between the cutout portion 95 and the actuator main body 3.

[0027] Furthermore, when grease is supplied by inserting a jig (not shown) from the other (left side in FIG. 8(a)) external opening of the grease supply path 93, a recess 97 is provided to avoid interference between the jig (not shown) and the lower left portion in FIG. 8(a) of the controller case element 41. Grease is supplied from the other (left side in FIG. 8(a)) external opening of the grease supply path 93 through the gap between the recess 97 and the controller case element 41.

[0028] As shown in Fig. 10, the actuator 1 is used by, for example, attaching a stopper 99 to the moving body 25 and installing it on a conveyor 101. An object 103 is transported by the conveyor 101, and the actuator 1 moves the stopper 99 to appear on the conveyor 101's side of the object 103 (upper side in Fig. 10), thereby restricting the movement of the object 103.

[0029] Next, the operation of the first embodiment will be described. First, the operation of the actuator 1 will be described. When the output shaft 33 of the motor 31 is rotated, the rotation of the output shaft 33 is transmitted by the motor-side timing pulley 35, the timing belt 39, and the ball screw shaft-side timing pulley 37, thereby rotating the ball screw shaft 15. When the ball screw shaft 15 is rotated, the ball screw nut 19 and the rod 21, and therefore the moving body 25, move forward or backward. At this time, the rotation control board 47 controls the motor driver board 45, thereby controlling the rotation speed, rotation direction, etc. of the motor 31. As shown in Figure 10, the actuator 1 is installed, for example, under the conveyor 101, and regulates the movement of the transported object 103 by making the stopper 99 installed on the moving body 25 appear on the upper side of the conveyor 101 in Figure 10.

[0030] The motor case 7 and the motor 31 are overlapped with the actuator main body 3 and are positioned offset toward one of the guide rods 29 (left side in FIG. 5) from the center in the width direction (left-right direction in FIG. 5), and the controller case 9 is fixed to the right side of the motor case 7 in FIG. 5, so that the controller case 9 does not protrude beyond the actuator main body 3. The actuator body 3 is provided with a grease supply port 91, and the grease supply port 91 is not blocked by the controller case 9 or the motor case 7.

[0031] The rotation control board 47 is installed in the controller case 9 with its lower end in FIG. 9 abutting against the rotation control board support rib 63, so that the rotation control board 47 will not move inadvertently when a connector (not shown) is inserted into the teaching device connector 55 or the external interface connector 57. The controller case 9 is installed so that the opening 75 for the teaching device connector and the opening 77 for the external interface connector are positioned on the opposite side of the actuator main body 3, making it easy to insert the connector of a cable (not shown) into the teaching device connector 55 or the external interface connector 57.

[0032] The controller case 9 is fixed to the right side of the motor case 7 in Figure 5 by passing fixing screws 89 through the mounting through holes 71 and 83 and screwing them into the motor case 7, and the heat dissipation sheet 53 of the motor driver board 45 is abutted against the motor case 7 through the motor case side opening 87, so that heat is effectively dissipated through the motor case 7. Furthermore, since the rotation control board 47 is arranged on the opposite side of the motor driver board 45 in the controller case 9, the rotation control board 47 is less susceptible to the influence of the FET 51 as a heat generating element.

[0033] In addition, the motor driver board 45, rotation control board 47, and communication circuit board 49 are housed in the controller case 9, isolated from the folding member 5 in which the drive connection mechanism 40 is housed, so that the motor driver board 45, rotation control board 47, and communication circuit board 49 are kept away from the drive connection mechanism 40, reducing the impact of the drive connection mechanism 40 on the motor driver board 45, rotation control board 47, and communication circuit board 49.

[0034] Next, the effects of this embodiment will be described. The motor case 7 and the motor 31 are arranged overlapping the actuator main body 3 and offset toward one guide rod 29 side (left side in FIG. 5 ) from the center in the width direction (left-right direction in FIG. 5 ), and the controller case 9 is fixed to the right side of the motor case 7 in FIG. 5 and does not protrude from the actuator main body 3, thereby reducing the installation area of ​​the actuator 1. Furthermore, the motor driver board 45, the rotation control board 47, and the communication circuit board 49 are housed in the controller case 9, separated from the folding member 5 in which the drive coupling mechanism 40 is housed. This allows the motor driver board 45, the rotation control board 47, and the communication circuit board 49 to be located away from the drive coupling mechanism 40, thereby reducing the influence of the drive coupling mechanism 40 on the motor driver board 45, the rotation control board 47, and the communication circuit board 49.

[0035] The controller case 9 is fixed to the right side of the motor case 7 in Figure 5 by passing fixing screws 89 through the mounting through holes 71 and 83 and screwing them into the motor case 7, and the heat dissipation sheet 53 of the motor driver board 45 is abutted against the motor case main body 28 through the motor case side opening 87, so that heat generated from the motor driver board 45 is effectively dissipated through the motor case main body 28. Furthermore, since the rotation control board 47 is disposed on the opposite side of the motor driver board 45 in the controller case 9, the rotation control board 47 is less susceptible to the effects of heat from the FET 51 as a heat generating element.

[0036] The controller case 9 is installed so that the opening 75 for the teaching device connector and the opening 77 for the external interface connector are positioned on the opposite side of the actuator main body 3, making it easier to insert a connector (not shown) into the teaching device connector 55 or the external interface connector 57. The rotation control board 47 is installed in the controller case 9 with its lower end in Figure 9 abutting against the rotation control board support rib 63, so that when a cable connector (not shown) is inserted into the teaching device connector 55 or the external interface connector 57, the rotation control board 47 can be stably installed so that it does not move inadvertently.

[0037] The drive coupling mechanism 40 is made up of the motor-side timing pulley 35, the ball screw shaft-side timing pulley 37, and the timing belt 39, so that design changes to change the positions of the motor case 7 and the motor 31 can be easily made.

[0038] The present invention is not limited to the above embodiment. There are various possible arrangements for the motor case and controller case, as long as they are superimposed on the actuator body, the position of the motor case is offset from the center toward the guide rods on both sides, and the controller case does not protrude from the actuator body. The illustrated configuration is merely an example, and various other cases are possible. [Industrial Applicability]

[0039] The present invention relates to an actuator, and in particular to an actuator that is designed to reduce the installation area, and is suitable for use in, for example, an actuator for an industrial robot. [Explanation of symbols]

[0040] 1 actuator 3 Actuator body 5 Folding member 7 Motor case 9 Controller Case 15 Ball screw shaft (screw shaft) 19 Ball screw nut (nut) 21 Rod 25 Moving body (connecting member) 29 Guide rod 31 Motor 33 Output shaft 35 Motor side timing pulley (first pulley) 37 Ball screw shaft side timing pulley (second pulley) 39 Timing belt (belt) 40 Drive coupling mechanism 45 Motor driver board (first electronic circuit board) 47 Rotation control board (second electronic circuit board) 51 FET (heat generating element) 55 Teaching device connector 57 External interface connector 75 Opening for teaching device connector 77 External interface connector opening

Claims

1. an actuator body that houses a centrally disposed screw shaft, a nut that is screwed onto the screw shaft, a rod that is fixed to the nut, and guide rods that are disposed on both sides of the screw shaft and are connected to the rod via connecting members to guide the rod; a motor case that is disposed on the actuator body and that houses a motor; a controller case that is disposed over the actuator body and that houses an electronic circuit board; a folding member that is installed across the actuator body and the motor case and that houses a drive coupling mechanism that transmits power from the motor to the screw shaft; Equipped with The motor and the motor case are disposed offset to one side of the guide rods, so that the output shaft of the motor is disposed offset to one side of the guide rods from the center, The actuator is characterized in that the controller case is disposed on the other side of the guide rod.

2. The actuator according to claim 1, The actuator is characterized in that the controller case does not protrude from an end of the actuator body.

3. The actuator according to claim 1, the controller case is provided with a connector opening through which a connector mounted on the electronic circuit board is exposed; The actuator is characterized in that the opening for the connector is provided on the side opposite to the actuator body.

4. The actuator according to claim 1, A heat generating element is mounted on the electronic circuit board, The actuator is characterized in that heat generated by the heating element is dissipated through the motor case.

5. The actuator according to claim 4, The electronic circuit board includes a first electronic circuit board on which a heat generating element is mounted and a second electronic circuit board on which a CPU is installed, An actuator characterized in that the first electronic circuit board is arranged on the motor case side and the second electronic circuit board is arranged on the opposite side of the motor case.

6. The actuator according to claim 1, The actuator is characterized in that the drive coupling mechanism comprises a first pulley fixed to the output shaft of the motor, a second pulley fixed to the screw shaft, and a belt wound around the first pulley and the second pulley.

Images