JP6933027B2 - Electric actuator - Google Patents

Description

The present invention relates to an electric actuator.

When the electric actuator is mounted on a vehicle, the shape of the actuator mounting portion is set according to the mounting specifications of each vehicle type to be mounted. Therefore, the case configuration of the actuator itself was changed if the vehicle type to be mounted was different.
Therefore, it was considered to standardize the actuator for many vehicle models and to make the bracket compatible with each vehicle model.
For example, when attaching a motor to a device, a conventional method has been to set the bracket shape according to the shape of the device (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-231564

Therefore, when considering mounting the electric actuator using a bracket, screw fastening can be considered as a method of fixing the actuator body and the bracket, and a through hole is provided in the flat plate at the portion of the bracket where the actuator body is mounted. The configuration is conceivable. Therefore, it is necessary to tighten the screws while manually aligning the actuator body and the bracket, and the assembly process is complicated with a general bracket.

One aspect of the present invention is to provide an electric actuator having excellent assembly workability.

According to one aspect of the present invention, the actuator main body is provided with a bracket fixed to the actuator main body, and the actuator main body has a housing and a plurality of support portions for connecting the housing to the bracket. the bracket includes a plurality of guide portions projecting a plurality of main fixing portion to which the plurality of support portion is fixed in contact to the body said bracket table surface or these inner fixed portion and the actuator body, wherein When viewed in the direction in which the support portion and the main body fixing portion face each other, there is a protrusion that is adjacent to the main body fixing portion and is located on the side of the support portion and projects from the bracket surface toward the actuator main body. However, an electric actuator is provided in which a plurality of the protrusions are arranged around one support.

According to the aspect of the present invention, an electric actuator having excellent assembly workability is provided.

FIG. 1 is a perspective view showing an electric actuator of an embodiment. FIG. 2 is a plan view of the electric actuator of the embodiment. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a plan view showing the electric actuator of the first modification. FIG. 5 is a cross-sectional view taken along the line BB of FIG. FIG. 6 is a plan view showing the electric actuator of the second modification. FIG. 7 is a cross-sectional view taken along the line CC of FIG. FIG. 8 is a plan view showing the electric actuator of the third modification. FIG. 9 is a plan view showing the electric actuator of the fourth modified example.

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

FIG. 1 is a perspective view showing an electric actuator of the present embodiment. FIG. 2 is a plan view of the electric actuator of the present embodiment. FIG. 3 is a cross-sectional view taken along the line AA of FIG.
As shown in FIG. 1, the electric actuator 10 of this embodiment has an actuator main body 11 and a bracket 50. The actuator main body 11 has a housing 20, an output shaft 21 protruding from the housing 20 and extending in the axial direction of the central shaft J1, a connector 22, and support portions 31, 32, 33. The actuator body 11 has a motor (not shown) and a speed reduction mechanism housed in the housing 20. The output shaft 21 is connected to the reduction mechanism and rotates around the central shaft J1.

In the following description, the axial direction of the central axis J1 is simply referred to as "axial direction", the upper side of FIG. 1 in the axial direction is simply referred to as "upper side", and the lower side of FIG. 1 in the axial direction is simply referred to as "lower side". Called. Further, the radial direction centered on the central axis J1 is simply referred to as "diametrical direction", and the circumferential direction centered on the central axis J1 is simply referred to as "circumferential direction". The upper side and the lower side are simply names for explaining the relative positional relationship of each part, and the actual arrangement relationship and the like may be an arrangement relationship and the like other than the arrangement relationship and the like indicated by these names. ..

The housing 20 has a motor case 20a and a speed reduction mechanism case 20b arranged in the axial direction. Both the motor case 20a and the reduction mechanism case 20b have a cylindrical shape centered on the central axis J1. The internal space of the motor case 20a and the internal space of the reduction mechanism case 20b are continuous in the axial direction. The output shaft 21 projects downward from the lower surface of the reduction mechanism case 20b.

The connector 22 is arranged at the upper end of the motor case 20a. The connector 22 extends radially from the outer peripheral surface of the motor case 20a and has a connection terminal 22a at an end portion on the outer side in the radial direction. The motor case 20a may include a control board on which a circuit for controlling the motor is mounted.

The speed reduction mechanism case 20b has a cylindrical shape having a larger diameter than the motor case 20a. The axial length of the reduction mechanism case 20b is shorter than the axial length of the motor case 20a. Three support portions 31 to 33 are arranged at the lower end of the outer peripheral surface of the speed reduction mechanism case 20b. The support portions 31 to 33 have a flat plate shape extending radially outward from the outer peripheral surface of the reduction mechanism case 20b. In the present embodiment, the reduction mechanism case 20b is a cylindrical portion extending along the central axis J1, and the support portions 31 to 33 extend radially outward from the outer peripheral surface of the reduction mechanism case 20b which is a cylindrical portion.

The support portions 31 to 33 come into contact with the bracket 50 on the lower surface. The support portions 31 to 33 have through holes 31a, 32a, 33a penetrating in the axial direction. The support portions 31 to 33 are arranged at equal intervals of 120 ° in the circumferential direction on the outer peripheral surface of the reduction mechanism case 20b.

The bracket 50 has a main body support portion 50a on which the actuator main body 11 is mounted, and L-shaped mounting portions 51 to 53 extending downward from the outer peripheral edge of the main body support portion 50a. The mounting portions 51 to 53 are portions that are fixed to a mounting position of a vehicle or the like by, for example, screwing. Although not shown, the main body support portion 50a has a central through hole that penetrates the central portion in the plan view in the axial direction. The output shaft 21 of the actuator body 11 is passed through the central through hole.

The mounting portions 51 to 53 have mounting holes 51a, 52a, and 53a that penetrate the mounting portions 51 to 53 in the axial direction on a surface that extends in a direction orthogonal to the axial direction. In the case of the present embodiment, the main body support portion 50a and the mounting portions 51 to 53 are manufactured by bending one metal plate.

The main body support portion 50a has main body fixing portions 50A, 50B, and 50C at three corners where the support portions 31, 32, and 33 of the actuator main body 11 are contacted and fixed, respectively. The bracket 50 has screw shafts 55a, 55b, 55c having one end fixed to the main body fixing portions 50A, 50B, 50C. The screw shafts 55a to 55c project from the upper surface of the main body support portion 50a to the upper side in the axial direction.

As shown in FIG. 3, the lower end of the screw shaft 55c is fixed to the main body support portion 50a by welding, adhesion, fastening, or the like. Similar to the screw shaft 55c, the screw shafts 55a and 55b are also fixed by welding, bonding, fastening, or the like. Male screws are provided up to the upper ends of the screw shafts 55a to 55c.

The screw shaft 55a is passed through the through hole 31a of the support portion 31, the screw shaft 55b is passed through the through hole 32a of the support portion 32, and the screw shaft 55c is passed through the through hole 33a of the support portion 33. The nut 60 is tightened to the tips of the screw shafts 55a to 55c, and the actuator body 11 and the bracket 50 are fastened. The screw shafts 55a to 55c guide the actuator body 11 to a predetermined position when fastening the actuator body 11 and the bracket 50. That is, the screw shafts 55a to 55c are guide portions provided on the bracket 50.

According to the above configuration, since the bracket 50 has the screw shafts 55a to 55c as the guide portion, when the actuator main body 11 and the bracket 50 are assembled, the screw shafts 55a to 55c move around the axis of the housing 20. Is suppressed. As a result, the state in which the actuator main body 11 and the bracket 50 are aligned can be easily maintained. As a result, the assembly work of the electric actuator 10 can be efficiently performed.

Further, the assembling worker can align the actuator main body 11 and the bracket 50 simply by passing the screw shafts 55a to 55c through the through holes 31a to 33a of the support portions 31 to 33. Therefore, the assembling work of the electric actuator 10 becomes very easy.

In the present embodiment, the actuator main body 11 has a shape including a cylindrical housing 20 and support portions 31 to 33 arranged at intervals of 120 °. Since the actuator main body 11 has a shape and arrangement that are rotationally symmetric with respect to the central axis J1, when the shape of the bracket 50 is changed for each application, it is unlikely that the actuator main body 11 cannot be mounted on the main body support portion 50a. Therefore, the electric actuator 10 that can be used for various purposes can be manufactured by using the common actuator main body 11.

(First modification)
FIG. 4 is a plan view showing the electric actuator of the first modification. FIG. 5 is a cross-sectional view taken along the line BB of FIG.
The electric actuator 110 of the first modification shown in FIGS. 4 and 5 has an actuator main body 111 and a bracket 150.

The actuator body 111 has a support portion 133. The support portion 133 has a plate shape extending radially outward from the outer peripheral surface of the speed reduction mechanism case 20b, and has a through hole 133a that penetrates the support portion 133 in the axial direction. While the support portion 133 shown in FIG. 4 has the same planar shape as the other two support portions 31 and 32, the direction extending outward from the outer peripheral surface of the reduction mechanism case 20b as compared with the support portions 31 and 32. Is the diagonal direction tilted to the left in the figure.

Specifically, as shown in FIG. 4, in the support portion 133, the straight line L3 passing through the tip P3 and the center of the through hole 133a intersects the radial straight line R3 passing through the center of the through hole 133a. The angle formed by the straight line L3 and the radial straight line R3 is defined in the present specification as the "protrusion angle of the support portion". In the support portion 133, the "protrusion angle of the support portion" is an angle other than 0 °.
Similarly, for the other two support portions 31 and 32, the angle formed by the straight line L1 and the radial straight line R1 and the angle formed by the straight line L2 and the radial straight line R2 are defined as "protrusion angles of the support portions". In the support portions 31 and 32, the center of the tip P1 and the through hole 31a and the center of the tip P2 and the through hole 32a are all aligned in the radial direction. Therefore, in the support portions 31 and 32, the straight line L1 and the radial straight line R1 and the straight line L2 and the radial straight line R2 are parallel to each other, and the “protrusion angle of the support portion” is 0 °.
From the above, the support portion 133 has a different protrusion angle from the outer peripheral surface of the reduction mechanism case 20b with respect to the other two support portions 31 and 32.

With this configuration, the assembly worker can easily grasp the orientation of the actuator main body 111 with respect to the bracket 150 based on the position of the support portion 133. Therefore, erroneous assembly in the assembly work of the electric actuator 110 is suppressed, and the assembly workability is improved.

The bracket 150 has a main body support portion 150a and mounting portions 51 to 53. The main body support portion 150a has a recess 155 having a shape along the outer shape of the actuator main body 111 in a plan view. The actuator main body 111 is arranged inside surrounded by a step portion 155a on the peripheral edge of the recess 155. The support portions 31, 32, 133 of the actuator main body 111 are fixed in contact with the bottom surface of the recess 155. Therefore, the main body fixing portions 50A to 50C of the bracket 150 are located inside the recess 155.

Since the bracket 150 has the recess 155, when the assembling worker places the actuator main body 111 on the main body support portion 150a of the bracket 150, the support portions 31, 32, 133 are formed by the stepped portion 155a to form the main body fixing portions 50A, 50B. , 50C respectively. When the actuator main body 111 is arranged in the recess 155, the step portion 155a restricts the movement of the actuator main body 111 in the direction orthogonal to the central axis J1. Therefore, in this modification, the step portion 155a of the recess 155 is a guide portion arranged adjacent to the support portions 31, 32, 133 of the actuator main body 111.

In this modification, the bracket 150 has screw shafts 55a to 55c fixed to the main body fixing portions 50A to 50C. Therefore, when assembling the actuator main body 111 and the bracket 150, the screw shafts 55a to 55c also function as guides for restricting the movement of the actuator main body 111. As a result, the state in which the actuator main body 111 and the bracket 150 are aligned is stably maintained.

In this modification, the screw shafts 55a to 55c fixed to the bracket 150 and the stepped portion 155a are used in combination as the guide portion, but these guide portions can be used independently. For example, the bracket 150 provided with the step portion 155a may have a through hole penetrating the main body support portion 150a instead of the screw shafts 55a to 55c. In this case, the actuator body 111 and the bracket 150 are fastened with bolts and nuts.

(Second modification)
FIG. 6 is a plan view showing the electric actuator of the second modification. FIG. 7 is a cross-sectional view taken along the line CC of FIG.
The electric actuator 210 of the second modification shown in FIGS. 6 and 7 has an actuator main body 111 and a bracket 250.

The bracket 250 has a main body support portion 250a and mounting portions 51 to 53. The main body support portion 250a has a plurality of protrusions 255a arranged adjacent to the support portions 31, 32, 133 of the actuator main body 111. The plurality of protrusions 255a are arranged adjacent to the main body fixing portions 50A, 50B, and 50C on the upper surface of the main body supporting portion 250a. Two protrusions 255a are arranged for each of the support portions 31, 32, 133 so as to sandwich the support portions 31, 32, 133 in the circumferential direction.
As shown in FIG. 7, the protrusion 255a can be manufactured by sheet metal processing in which the main body support portion 250a is extruded from the lower surface side. The protrusion 255a may be manufactured by cutting and raising the main body support portion 250a.

Since the bracket 250 has a plurality of protrusions 255a, when the assembling worker places the actuator main body 111 on the main body support 250a of the bracket 250, the support portions 31, 32, 133 are fixed by the protrusions 255a. You will be guided to 50A, 50B, and 50C, respectively. Since the support portions 31, 32, and 133 are arranged so as to be sandwiched between two protrusions 255a, movement in the direction orthogonal to the central axis J1 of the actuator main body 111 is restricted. Therefore, in this modification, the plurality of protrusions 255a are guide portions arranged adjacent to the support portions 31, 32, 133 of the actuator main body 111.

In this modification, the protrusion 255a has a shape extending along the side surfaces of the support portions 31, 32, 133 arranged adjacent to each other. With this configuration, the movement of the support portions 31, 32, and 133 in a plurality of directions is restricted, so that the aligned state of the actuator main body 111 and the bracket 250 can be more easily maintained.

Also in this modification, instead of the screw shafts 55a to 55c, a through hole may be provided to penetrate the main body support portion 250a. In this case, the actuator body 111 and the bracket 250 are fastened with bolts and nuts.

(Third modification example)
FIG. 8 is a plan view showing the electric actuator of the third modification.
The electric actuator 310 of the third modification shown in FIG. 8 has an actuator main body 311 and a bracket 50.

The actuator body 311 has a support portion 333. The support portion 333 has a plate shape extending radially outward from the outer peripheral surface of the speed reduction mechanism case 20b, and has a through hole 333a that penetrates the support portion 333 in the axial direction. The support portion 333 shown in FIG. 8 has a shorter length extending radially outward from the outer peripheral surface of the reduction mechanism case 20b as compared with the other two support portions 31 and 32.

With this configuration, the assembly worker can easily grasp the orientation of the actuator main body 311 with respect to the bracket 50 based on the position of the support portion 333. Therefore, erroneous assembly in the assembly work of the electric actuator 310 is suppressed, and the assembly workability is improved.

Also in this modification, instead of the screw shafts 55a to 55c, a through hole may be provided to penetrate the main body support portion 50a. In this case, the actuator body 311 and the bracket 50 are fastened with bolts and nuts.

(Fourth modification)
FIG. 9 is a plan view showing the electric actuator of the fourth modified example.
The electric actuator 410 of the fourth modification shown in FIG. 9 has an actuator main body 411 and a bracket 50.

The actuator body 411 has a support portion 433. The support portion 433 has a plate shape extending radially outward from the outer peripheral surface of the speed reduction mechanism case 20b, and has a through hole 433a that penetrates the support portion 433 in the axial direction. The support portion 433 shown in FIG. 9 has a different position of the through hole 433a in a plan view with respect to the other two support portions 31 and 32. Specifically, in FIG. 9, the through holes 31a and 32a are located at the central portions of the support portions 31 and 32, respectively, whereas the through holes 433a are displaced from the central portion of the support portion 433 to the right side in the drawing. Be placed.

In this modification, the support portions 31, 32, 433 of the actuator main body 411 are arranged at equal intervals of 120 ° on the outer peripheral surface of the reduction mechanism case 20b, while the angular pitch of the through holes 31a, 32a, 433a is 120 °. Get out of the way. As a result, the screw shafts 55a to 55c located at the main body fixing portions 50A to 50C are arranged at unequal pitches in the circumferential direction around the central shaft J1. According to this configuration, the actuator main body 411 can be attached to the screw shafts 55a to 55c only in a specific direction, so that erroneous assembly in the assembly work can be prevented.

Also in this modification, instead of the screw shafts 55a to 55c, a through hole may be provided to penetrate the main body support portion 50a. In this case, the actuator body 411 and the bracket 50 are fastened with bolts and nuts.

In each of the above configurations, the case where the support portions 31 to 33, 133, 333, 433 have a shape protruding radially outward from the outer peripheral surface of the reduction mechanism case 20b has been described, but the shape of the support portion is this. Not limited to. For example, in the embodiment, the support portions 31 to 33 may be configured to project downward from the lower surface of the reduction mechanism case 20b. Alternatively, in the embodiment, the support portions 31 to 33 may be arranged radially inside the outer peripheral surface of the speed reduction mechanism case 20b.
In addition, the configurations of the above-described embodiments and modifications can be appropriately combined within a range that does not contradict each other.

10,110,210,310,410 ... Electric actuator, 11,111,311,411 ... Actuator body, 20 ... Housing, 31,32,33,133,333,433 ... Support part, 50,150,250 ... Bracket , 50A ... Main body fixing part, 55a, 55b, 55c ... Screw shaft, 60 ... Nut, 155 ... Recessed part, 155a ... Stepped part, 255a ... Protruding part, J1 ... Central shaft

Claims (11)

The actuator body and the bracket fixed to the actuator body are provided.
The actuator body has a housing and a plurality of supports that connect the housing to the bracket.
The bracket is
A plurality of main body fixing portions in which the plurality of supporting portions are contacted and fixed,
A plurality of guide portions projecting into the bracket table surface or al the actuator body side of the inside of the main body fixed portion,
When viewed in the direction in which the support portion and the main body fixing portion face each other, a protruding portion that is adjacent to the main body fixing portion and is located on the side of the support portion and projects from the bracket surface toward the actuator main body. Have and
A plurality of the protrusions are arranged around one support.
Electric actuator. The guide portion is a screw shaft fixed to the bracket.
The support portion has a penetrating portion through which the screw shaft is passed, and is fixed to the bracket by a nut tightened to the screw shaft protruding from the penetrating portion.
The electric actuator according to claim 1. The bracket has a recess that accommodates at least a portion of the support.
The main body fixing portion is located inside the recess.
The guide portion is a stepped portion on the periphery of the recess.
The electric actuator according to claim 1. The protrusion has a shape extending along at least a part of the side surface of the support.
The electric actuator according to claim 1. The support portion is fixed to the bracket by a bolt penetrating the support portion and a nut tightened to the bolt.
The electric actuator according to claim 3. The support portion is fixed to the bracket by a screw shaft fixed to the main body fixing portion and a nut tightened to the screw shaft.
The electric actuator according to claim 3. The housing has a cylindrical portion that extends along a central axis.
The plurality of support portions extend radially outward of the cylindrical portion.
The electric actuator according to any one of claims 1 to 6. At least two of the supports have different shapes from each other.
The electric actuator according to claim 7. The plurality of support portions are arranged at unequal pitches in the circumferential direction of the cylindrical portion.
The electric actuator according to claim 7. The main body fixing portion has a screw shaft or a bolt for fixing the support portion, and has a screw shaft or a bolt.
The screw shaft or the bolt is arranged at an unequal pitch in the circumferential direction of the cylindrical portion.
The electric actuator according to claim 7. At least two of the supports have different angles of protrusion from the outer peripheral surface of the cylindrical portion.
The electric actuator according to claim 7.

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