Actuator

Abstract

This actuator (1) is provided with a motor (3), a driven machine (2), a base plate (16), a belt mechanism (4), and a tension adjustment mechanism (5), in which a through-hole (16b) is formed in the base plate (16), and the tension adjustment mechanism (5) is provided with an adjustment plate (40) and an adjustment screw (50).

Description

Technical Field

[0001] The present invention relates to an actuator. This application claims priority to Japanese Patent Application No. 2022-079669 filed on May 13, 2022, the contents of which are incorporated herein by reference. Background Art

[0002] Patent Document 1 below describes an electromechanical actuator used in various industrial applications such as a mechanical press. The actuator includes a motor (electric motor) and a linear actuator (driven machine) supported adjacent to each other on a mounting plate (base plate).

[0003] The screw shaft (driven shaft) of the linear actuator is connected to the output shaft (drive shaft) of the motor through a belt and pulley system (belt mechanism) so as to rotate together. A plurality of grooves extending in the lateral direction relative to the linear actuator are formed in the mounting plate, and the belt tension can be adjusted by moving the motor in the lateral direction along the grooves.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: U.S. Patent No. 8823229 Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, in the above-mentioned prior art, the main body of the motor is mounted on the plate surface side of the base plate in such a manner that the drive shaft of the motor protrudes toward the plate surface side of one side of the base plate. In this way, when the drive shaft of the motor passes through the base plate, the drive shaft needs a length corresponding to the thickness of the base plate as well as a length for protruding from the base plate. As a result, the drive shaft becomes longer, and the load resistance performance against the radial load received from the belt is reduced, and there is a problem that the drive shaft is easily bent.

[0009] The present invention has been made in view of the above problems, and an object of the present invention is to provide an actuator capable of improving the load resistance performance in the radial direction of a drive shaft of an electric motor and adjusting the tension of a belt that transmits torque to a driven shaft of a driven machine.

[0010] Means for solving problems

[0011] In order to solve the above-mentioned problems, the first scheme of the present invention relates to an actuator, which comprises: an electric motor having a drive shaft; a driven machine having a driven shaft; a base plate on which the electric motor and the driven machine are mounted so that the drive shaft and the driven shaft protrude from one side of the plate surface; a belt mechanism, which is arranged on the plate surface side of one side of the base plate and transmits the torque of the drive shaft to the driven shaft; and a tension adjustment mechanism, which adjusts the tension of the belt mechanism, and a through hole extending in a first direction in which the drive shaft and the driven shaft approach and separate from each other is formed on the base plate, the tension adjustment mechanism comprising: an adjustment plate, which is assembled on the main body of the motor and inserted into the through hole together with the main body; and an adjustment screw, which causes the adjustment plate to move in the through hole along the first direction.

[0012] A second aspect of the present invention is the actuator according to the first aspect, wherein the main body includes a stator and a speed reducer.

[0013] A third aspect of the present invention is the actuator according to the first aspect or the second aspect, wherein the adjustment plate is arranged to be flush with one plate surface of the base plate.

[0014] A fourth aspect of the present invention is the actuator according to the first aspect or the second aspect, wherein the adjustment screw is threadedly engaged with a corner portion of the adjustment plate.

[0015] The fifth scheme of the present invention is based on the actuator described in the fourth scheme, and the adjustment plate has: a first plate portion, which is arranged in the through hole; and a second plate portion, which is connected to the first plate portion and fixed to the base plate, and the corner of the adjustment plate is the portion where the first plate portion and the second plate portion overlap.

[0016] The sixth scheme of the present invention is based on the actuator described in the first scheme or the second scheme, and the adjustment plate has: a first plate portion, which is arranged in the through hole; and a second plate portion, which is connected to the first plate portion and fixed to the base plate, and the second plate portion is fixed to the other plate surface of the base plate on the opposite side of the plate surface on one side.

[0017] Effects of the Invention

[0018] According to the present invention, the load resistance performance in the radial direction of the drive shaft of the electric motor can be improved, and the tension of the belt that transmits torque to the driven shaft of the driven machine can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a perspective view of the actuator in the first embodiment of the present invention.

[0020] Figure 2It is an exploded perspective view of the actuator in the first embodiment of the present invention.

[0021] Figure 3 yes Figure 2 The cross-sectional view taken along arrow III-III is shown.

[0022] Figure 4 It is a perspective view of a base plate, a belt mechanism, and a tension adjustment mechanism in the first embodiment of the present invention.

[0023] Figure 5 This is a plan view of the base plate, the belt mechanism, and the tension adjustment mechanism in the first embodiment of the present invention as viewed from the axial direction.

[0024] Figure 6 yes Figure 5 The VI-VI cross-sectional view is shown.

[0025] Figure 7 It is a perspective view of the adjustment plate in the first embodiment of the present invention.

[0026] Figure 8 It is a perspective view of a base plate, a belt mechanism, and a tension adjustment mechanism in a second embodiment of the present invention.

[0027] Fig. 9 This is a plan view of a base plate, a belt mechanism, and a tension adjustment mechanism according to a second embodiment of the present invention as viewed from the axial direction.

[0028] Fig.10 yes Fig. 9 The sectional view in the direction XX is shown.

[0029] Fig.11 It is a perspective view of an adjustment plate in a second embodiment of the present invention.

[0030] Fig.12 It is a perspective view of a base plate, a belt mechanism, and a tension adjustment mechanism in a third embodiment of the present invention.

[0031] Fig.13 This is a plan view of a base plate, a belt mechanism, and a tension adjustment mechanism according to a third embodiment of the present invention as viewed from the axial direction. DETAILED DESCRIPTION

[0032] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0033] (First embodiment)

[0034] Figure 1 It is a perspective view of the actuator 1 in the first embodiment of the present invention. Figure 2 It is an exploded perspective view of the actuator 1 in the first embodiment of the present invention. Figure 3 yes Figure 2 The cross-sectional view taken along arrow III-III is shown.

[0035] like Figure 1 As shown, the actuator 1 includes a driven machine 2 , a motor 3 for driving the driven machine 2 , a belt mechanism 4 for transmitting torque of the motor 3 to the driven machine 2 , and a tension adjustment mechanism 5 for adjusting tension of the belt mechanism 4 .

[0036] like Figure 2 As shown in FIG. 1 , the driven machine 2 includes a linear motion guide device 10, a table 11 moved by the linear motion guide device 10, and a cover 12 mounted on the linear motion guide device 10. Figure 1 As shown, in a state where the cover 12 is mounted on the linear motion guide device 10 , the table 11 is exposed to the outside from a gap between the cover 12 and the linear motion guide device 10 .

[0037] It should be noted that in the following description, an XYZ orthogonal coordinate system is sometimes set, and the positional relationship of each component is described with reference to the XYZ orthogonal coordinate system. Figure 2 The axial direction in which the screw shaft 14 of the linear motion guide device 10 shown extends. The Y-axis direction is orthogonal to the X-axis direction and is the normal direction of the mounting surface of the worktable 11. The Z-axis direction is orthogonal to the X-axis direction and the Y-axis direction and is the direction (first direction) in which the driven machine 2 and the motor 3 are opposite.

[0038] The linear motion guide device 10 has the following Figure 3 As shown in the figure, the track body 13 extending in the X-axis direction and having a concave cross-sectional shape, the screw shaft 14 arranged inside the track body 13 and extending in the X-axis direction, the end plate 15 for axially supporting one end of the screw shaft 14, Figure 2 Shown are a base plate 16 that axially supports the other end of the screw shaft 14 , and a movable body 17 that moves in the X-axis direction between the end plate 15 and the base plate 16 as the screw shaft 14 rotates.

[0039] like Figure 3 As shown in FIG. 1 , a groove is formed on the inner side of a pair of side walls of the track body 13 that are opposite to each other in the Z-axis direction, and a pair of rolling element rolling grooves 13a are formed at the corners of the grooves, which are separated in the Y-axis direction and extend in the X-axis direction. That is, a total of four rolling element rolling grooves 13a are formed in the track body 13. In addition, a mounting hole 13b with a countersunk hole that penetrates in the Y-axis direction is formed in the bottom wall of the track body 13 that connects the pair of side walls.

[0040] The screw shaft 14 is supported by bearings (not shown) provided on an end plate 15 mounted at one end of the track body 13 in the X-axis direction and a base plate 16 mounted at the other end of the track body 13 in the X-axis direction so as to be rotatable about an axis extending in the X-axis direction. A spiral groove (not shown) is formed on the outer peripheral surface of the screw shaft 14.

[0041] In the center of the moving body 17, a threaded hole 17c is formed through the X-axis direction for the screw shaft 14 to be screwed. As a result, the moving body 17 is fed by the screw along the X-axis direction by rotating around the axis extending along the X-axis direction of the screw shaft 14. It should be noted that a rolling body such as a ball not shown is sandwiched between the screw shaft 14 and the threaded hole 17c. A mounting hole 17d for mounting the workbench 11 is formed on the top surface of the moving body 17 on the opening side of the track body 13 facing the Y-axis direction.

[0042] Rolling element load rolling grooves 17a are formed on both sides of the moving body 17 in the Z-axis direction, and are opposed to the rolling element rolling grooves 13a of the track body 13. A pair of rolling element load rolling grooves 17a and rolling element rolling grooves 13a are formed on both sides of the moving body 17 in the Z-axis direction, and a total of four rolling element load rolling grooves 17a are formed corresponding to the rolling element rolling grooves 13a. In addition, on the inner side of both sides of the moving body 17 in the Z-axis direction, a total of four unloaded rolling element rolling paths C2 corresponding to the rolling element rolling grooves 13a are formed to penetrate along the X-axis direction.

[0043] The rolling element load groove 17a is opposite to the rolling element rolling groove 13a of the track body 13, forming a loaded rolling element rolling path C1 for rolling the rolling element 19 such as a ball under a load. The inner diameter of the unloaded rolling element rolling path C2 is larger than the outer diameter of the rolling element 19, so that no load is applied to the rolling element 19. Figure 2 As shown, the movable body 17 has a rolling element direction changing path C3 connecting both ends of the loaded rolling element rolling path C1 and the unloaded rolling element rolling path C2 in the cover body 18 installed on both sides in the X-axis direction, thereby forming an endless circulation path C for the rolling element 19.

[0044] A pair of infinite loops C are formed on both sides of the moving body 17 in the Z-axis direction, and a total of four are formed. As a result, the moving body 17 is stopped from rotating relative to a pair of side walls of the track body 13 that are opposite in the Z-axis direction, and is smoothly guided along the pair of side walls in the X-axis direction. It should be noted that a dust cover 20 is installed on both side surfaces of the moving body 17 in the Z-axis direction to cover the gap with the track body 13 in an extended manner in the X-axis direction.

[0045] Figure 4 It is a perspective view of the base plate 16 , the belt mechanism 4 , and the tension adjustment mechanism 5 in the first embodiment of the present invention. Figure 5 This is a plan view of the base plate 16 , the belt mechanism 4 , and the tension adjustment mechanism 5 according to the first embodiment of the present invention as viewed from the axial direction. Figure 6 yes Figure 5 The VI-VI cross-sectional view is shown. Figure 7 It is a perspective view of the adjustment plate 40 in the first embodiment of the present invention.

[0046] like Figure 4 As shown, the base plate 16 is mounted on the end surface of the rail body 13 in the X-axis direction by a plurality of screws 21 .

[0047] The driven shaft 14a of the driven machine 2 and the driving shaft 3a of the motor 3 protrude from a plate surface 16a on one side of the base plate 16. The driven shaft 14a is an end portion of the screw shaft 14 of the above-mentioned linear motion guide device 10, and penetrates the base plate 16 in the X-axis direction. The driven shaft 14a is separated from the driving shaft 3a in the Z-axis direction and extends in parallel in the X-axis direction.

[0048] The belt mechanism 4 is arranged on the plate surface 16a side of one side of the base plate 16. The belt mechanism 4 includes a driving side pulley 31 mounted on the driving shaft 3a, a driven side pulley 32 mounted on the driven shaft 14a, and a belt 33 spanned between the driving side pulley 31 and the driven side pulley 32. The belt 33 is, for example, a timing belt meshed with the gear-shaped driving side pulley 31 and the driven side pulley 32. It should be noted that the belt 33 may also be a V-belt, a grooved belt, or the like.

[0049] like Figure 5 As shown, a through hole 16b is formed on the motor 3 side (+Z side) of the base plate 16, and the through hole 16b extends along the Z-axis direction (first direction) in which the drive shaft 3a and the driven shaft 14a approach and separate. Figure 5 The through hole 16b has a rectangular shape with the Z-axis direction as the longitudinal direction in the plan view. The through hole 16b has arc-shaped depressions 16c in the plan view formed at four corners to avoid interference with the adjustment plate 40 described later.

[0050] The tension adjustment mechanism 5 includes an adjustment plate 40 mounted on the main body of the motor 3 and inserted into the through hole 16b together with the main body, and an adjustment screw 50 for moving the adjustment plate 40 in the through hole 16b in the Z-axis direction. Figure 6 As shown, the main body of the motor 3 includes a stator 3c for rotating the drive shaft 3a, and a speed reducer 3b for reducing the rotation of the drive shaft 3a.

[0051] The stator 3c is arranged on the plate surface 16e side of the other side of the base plate 16, opposite to the drive shaft 3a protruding to the plate surface 16a side of one side of the base plate 16. The speed reducer 3b is sandwiched between the stator 3c and the drive shaft 3a, and is arranged in the through hole 16b of the base plate 16. That is, in this embodiment, the speed reducer 3b part of the main body of the motor 3 is inserted into the through hole 16b. It should be noted that, in the absence of the speed reducer 3b, the stator 3c can also be arranged in the through hole 16b.

[0052] The adjustment plate 40 includes a first plate portion 41 disposed in the through hole 16b together with the speed reducer 3b, and a second plate portion 42 connected to the first plate portion 41 and fixed to the other plate surface 16e of the base plate 16. The first plate portion 41 is disposed coplanar with the one plate surface 16a of the base plate 16.

[0053] The first plate portion 41 is Figure 5 The first plate portion 41 is guided along the long sides of the through hole 16b on both sides of the Y-axis direction and can move in the through hole 16b along the Z-axis direction. That is, a small gap is formed between the through hole 16b and the first plate portion 41 on both sides of the Y-axis direction.

[0054] like Figure 7 As shown, an opening 44 is formed in the center of the first plate portion 41. The opening 44 has a size and shape that allows the main body (reducer 3b) of the motor 3 to be inserted. Around the opening 44 of the first plate portion 41, a plurality of (four in this embodiment) countersunk holes 45 and mounting holes 46 are formed at intervals in the circumferential direction.

[0055] like Figure 4 and Figure 5 As shown, the screw 22 is inserted into the mounting hole 46, and the main body (stator 3c) of the motor 3 can be mounted. The countersunk hole 45 has a depth such that the head of the screw 22 inserted into the mounting hole 46 does not protrude from the plate surface 16a of one side of the base plate 16. Thus, interference between the screw 22 and the belt 33 can be avoided.

[0056] like Figure 5 and Figure 7 As shown in FIG. 1 , a threaded hole 47 for screwing the adjustment screw 50 is formed on the end surface of the first plate portion 41 facing the +Z side (the side opposite to the driven shaft 14a). The threaded hole 47 is formed at the middle position of the first plate portion 41 in the Y-axis direction. Figure 5 As shown, a communication hole 16 d communicating with the screw hole 47 in the Z-axis direction is formed in the base plate 16 .

[0057] The adjustment screw 50 is screwed into the threaded hole 47 of the first plate portion 41 disposed in the through hole 16b via the communicating hole 16d of the base plate 16. Thus, by rotating the adjustment screw 50 about the axis extending in the Z-axis direction, the adjustment plate 40 can be moved in the Z-axis direction to adjust the tension of the belt 33.

[0058] The second plate portion 42 extends from the first plate portion 41 to both sides in the Y-axis direction. The second plate portion 42 is formed with a long hole 48 for fixing the adjustment plate 40 at any position in the Z-axis direction. The long hole 48 extends in the Z-axis direction. Two long holes 48 are formed in each of the pair of second plate portions 42 on both sides of the first plate portion 41 in the Y-axis direction, and a total of four long holes 48 are formed. The fixing screws 23 screwed with the base plate 16 are inserted into the long holes 48.

[0059] like Figure 6 As shown, the second plate portion 42 is fixed to the other plate surface 16e of the base plate 16 on the opposite side of the plate surface 16a by fixing screws 23. Figure 7 As shown, the second plate portion 42 overlaps the corner portions 43 on both sides of the first plate portion 41 in the Y-axis direction in the X-axis direction. That is, a step-like step is formed on both sides of the adjustment plate 40 in the Y-axis direction, and the second plate portion 42 can be arranged on the other side of the plate surface 16e of the base plate 16 through the step.

[0060] As described above, the actuator 1 of the present embodiment includes: a motor 3 having a drive shaft 3a, a driven machine 2 having a driven shaft 14a, a base plate 16 on which the motor 3 and the driven machine 2 are mounted in a state where the drive shaft 3a and the driven shaft 14a protrude from one plate surface 16a, a belt mechanism 4 that is arranged on the plate surface 16a side of one side of the base plate 16 and transmits the torque of the drive shaft 3a to the driven shaft 14a, and a tension adjustment mechanism 5 that adjusts the tension of the belt mechanism 4, the base plate 16 is formed with a through hole 16b extending in the Z-axis direction (first direction) in which the drive shaft 3a and the driven shaft 14a approach and separate, and the tension adjustment mechanism 5 includes: an adjustment plate 40 that is assembled to the main body of the motor 3 and inserted into the through hole 16b together with the main body, and an adjustment screw 50 that moves the adjustment plate 40 in the through hole 16b in the Z-axis direction.

[0061] According to this structure, Figure 5 As shown, by rotating the adjustment screw 50 about the axis extending in the Z-axis direction, the adjustment plate 40 can be moved in the Z-axis direction together with the motor 3 (drive shaft 3a) to adjust the tension of the belt 33. Figure 6 As shown, the adjustment plate 40 is mounted on the main body of the motor 3 and inserted into the through hole 16b together with the main body (reducer 3b), so that the drive shaft 3a can be shortened by the relative thickness of the base plate 16. As a result, the drive shaft 3a is shortened, the load resistance performance against the radial load received from the belt 33 is improved, and the drive shaft 3a is less likely to bend.

[0062] As described above, according to the actuator 1 of this embodiment, the load bearing performance in the radial direction of the drive shaft 3 a of the motor 3 can be improved, and the tension of the belt 33 that transmits torque to the driven shaft 14 a of the driven machine 2 can be adjusted.

[0063] In this embodiment, the main body of the motor 3 includes the stator 3c and the speed reducer 3b. According to this structure, at least one of the stator 3c and the speed reducer 3b can be inserted into the through hole 16b of the base plate 16 to shorten the drive shaft 3a.

[0064] In the present embodiment, the adjustment plate 40 is disposed to be flush with the plate surface 16a of the base plate 16. This configuration avoids interference between the adjustment plate 40 and the belt 33 and reduces the length of the drive shaft 3a to a necessary minimum.

[0065] In addition, in the present embodiment, the adjustment plate 40 includes: a first plate portion 41 disposed in the through hole 16b, and a second plate portion 42 connected to the first plate portion 41 and fixed to the base plate 16, and the second plate portion 42 is fixed to the other plate surface 16e on the side opposite to the one plate surface 16a of the base plate 16. According to this structure, the adjustment plate 40 can be fixed to the base plate 16 without interference between the second plate portion 42 and the belt 33.

[0066] (Second embodiment)

[0067] Next, a second embodiment of the present invention will be described. In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description thereof will be simplified or omitted.

[0068] Figure 8 It is a perspective view of the base plate 16 , the belt mechanism 4 , and the tension adjustment mechanism 5 in the second embodiment of the present invention. Fig. 9 This is a plan view of the base plate 16 , the belt mechanism 4 , and the tension adjustment mechanism 5 according to the second embodiment of the present invention as viewed from the axial direction. Fig.10 yes Fig. 9 The sectional view in the direction XX is shown. Fig.11 It is a perspective view of the adjustment plate 40 in the second embodiment of the present invention.

[0069] As shown in these figures, in the second embodiment, the difference from the above-mentioned embodiment is that the second plate portion 42 of the adjustment plate 40 is fixed to the plate surface 16a of one side of the base plate 16. That is, the driven shaft 14a of the driven machine 2 and the driving shaft 3a of the motor 3 protrude from the plate surface 16a of one side of the base plate 16, and the belt mechanism 4 is arranged, and the second plate portion 42 of the adjustment plate 40 is fixed.

[0070] The second plate portion 42 is fixed to the plate surface 16a of one side of the base plate 16 by means of fixing screws 23. Fig.11As shown, the second plate portion 42 overlaps the first plate portion 41 at the -X side at the corners 43 on both sides of the Y axis direction. That is, a step-like step is formed on both sides of the adjustment plate 40 in the Y axis direction, and the second plate portion 42 can be arranged on the plate surface 16a side of one side of the base plate 16 through the step.

[0071] like Fig.10 As shown, the second plate portion 42 is separated in the Y-axis direction in a manner that does not interfere with the belt 33. According to this structure, it is possible to avoid interference between the adjustment plate 40 and the belt 33 and to make the length of the drive shaft 3a the minimum required. However, Figure 5 In the first embodiment shown, the second plate portion 42 is disposed on the opposite side to the belt 33 across the base plate 16 , so the degree of freedom in design is increased.

[0072] (Third Embodiment)

[0073] Next, a third embodiment of the present invention will be described. In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description thereof will be simplified or omitted.

[0074] Fig.12 It is a perspective view of the base plate 16 , the belt mechanism 4 , and the tension adjustment mechanism 5 in the third embodiment of the present invention. Fig.13 This is a plan view of the base plate 16 , the belt mechanism 4 , and the tension adjustment mechanism 5 according to the third embodiment of the present invention as viewed from the axial direction.

[0075] like Fig.13 As shown, in the third embodiment, the difference from the above-mentioned embodiment is that the adjustment screw 50 is screwed with the corner portion 43 of the adjustment plate 40. The adjustment screw 50 of the third embodiment is inserted into the communication hole 16d that communicates with one side (+Y side) in the Y-axis direction of the through hole 16b of the base plate 16, and is screwed with the threaded hole 47 formed in the corner portion 43 of the first plate portion 41.

[0076] As mentioned above Figure 7 As shown, the corner 43 is a portion where the first plate portion 41 and the second plate portion 42 overlap. That is, the screw hole 47 of the third embodiment is formed in a portion where the thickness of the adjustment plate 40 increases. Thus, the strength of the adjustment plate 40 having the screw hole 47 is easily ensured.

[0077] In the third embodiment, by rotating the adjustment screw 50 about the axis extending in the Z-axis direction, the adjustment plate 40 can also be moved in the Z-axis direction to adjust the tension of the belt 33. It should be noted that the first plate portion 41 of the adjustment plate 40 is in sliding contact with the long side of the through hole 16b on one side (+Y side) in the Y-axis direction. As a result, the clearance between the adjustment plate 40 and the through hole 16b in the Y-axis direction only needs to be managed on the other side (-Y side) in the Y-axis direction, so assembly and precision management become easy.

[0078] The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. The shapes and combinations of the components shown in the above embodiments are examples, and various changes can be made based on design requirements, etc. without departing from the scope of the present invention.

[0079] For example, in the above-mentioned embodiment, the linear motion guide device 10 is exemplified as the driven machine 2, but the invention is not limited to this structure. As the driven machine 2, it can be applied to all rotating machines including a driven shaft.

[0080] For example, in the above-described embodiment, the configuration in which the adjustment plate 40 is moved by one adjustment screw 50 is exemplified, but the configuration in which the adjustment plate 40 is moved by a plurality of (two or more) adjustment screws 50 may be used.

[0081] Industrial Applicability

[0082] According to the present invention, the load resistance performance in the radial direction of the drive shaft of the electric motor can be improved, and the tension of the belt that transmits torque to the driven shaft of the driven machine can be adjusted.

[0083] Description of reference numerals:

[0084] 1 Actuator

[0085] 2. Driven machine

[0086] 3. Electric Motor

[0087] 3a Drive shaft

[0088] 3b Reducer

[0089] 3c Stator

[0090] 4 belt mechanism

[0091] 5 Tension adjustment mechanism

[0092] 14a Driven shaft

[0093] 16 Base plate

[0094] 16a One side of the board

[0095] 16b Through hole

[0096] 16e The other side of the board

[0097] 40 Adjustment plate

[0098] 41 First board

[0099] 42 Second board

[0100] 43 corner

[0101] 50 Adjustment screw.

Claims

1. An actuator, wherein: The actuator comprises: an electric motor having a drive shaft; A driven machine having a driven shaft; a base plate on which the motor and the driven machine are mounted so that the drive shaft and the driven shaft protrude from one plate surface; a belt mechanism disposed on one plate surface side of the base plate and transmitting the torque of the drive shaft to the driven shaft; as well as a tension adjustment mechanism, which adjusts the tension of the belt mechanism, The base plate is provided with a through hole extending in a first direction in which the driving shaft and the driven shaft approach and separate from each other. The tension adjustment mechanism comprises: an adjustment plate mounted on the main body of the motor and inserted into the through hole together with the main body; and An adjusting screw enables the adjusting plate to move in the through hole along the first direction.

2. The actuator according to claim 1, wherein: The main body includes a stator and a reducer.

3. The actuator according to claim 1 or 2, wherein: The adjustment plate is arranged to be flush with one plate surface of the base plate.

4. The actuator according to claim 1 or 2, wherein: The adjusting screw is screwed into a corner portion of the adjusting plate.

5. The actuator according to claim 4, wherein: The adjustment plate has: A first plate portion, which is disposed in the through hole; and a second plate portion, which is connected to the first plate portion and fixed to the base plate, The corner portion of the adjustment plate is a portion where the first plate portion and the second plate portion overlap.

6. The actuator according to claim 1 or 2, wherein: The adjustment plate has: A first plate portion, which is disposed in the through hole; and a second plate portion, which is connected to the first plate portion and fixed to the base plate, The second plate portion is fixed to the other plate surface of the base plate on the opposite side to the one plate surface.

Images