Motor driving device

Abstract

The purpose of the present invention is to efficiently perform component assembly work. A motor drive device (1) according to one embodiment of the present disclosure has a first member (10) and a second member (30). The second member is fixed to the first member by inserting the shaft body (20) into a first hole (13) through which the first member is inserted from a second hole (33) through which the second member is inserted. The first member and the second member are provided with alignment structures 11, 31 for aligning the second member with respect to the first member. In the alignment structure, a margin is provided by taking a range in which the first hole can be visually confirmed through the second hole as a boundary.

Description

Technical Field

[0001] The invention relates to a motor driving device for driving a motor. Background Art

[0002] In the assembly of various devices, including motor drive devices, it is often necessary to fix two components to each other by screwing. The operator or robot responsible for the screw tightening operation aligns the two components so that the screw hole formed on one component overlaps with the through hole formed on the other component, and tightens the screws while pressing them without shifting. However, the alignment of components that are difficult to distinguish between the front and back, up and down, left and right, or the alignment of lightweight components sometimes takes a long time. In addition, sometimes the rotational force of the screw when tightening the screw causes the component to rotate, and the two components must be aligned again.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-229224 Summary of the invention

[0006] Problem that the invention aims to solve

[0007] In order to deal with these situations, it is also possible to prepare a jig for aligning the two parts. However, the introduction of a new jig may increase the man-hours of the assembly work, which may become a factor that impairs the workability. Therefore, it is hoped that the assembly work of the parts can be carried out efficiently.

[0008] Means used to solve problems

[0009] A motor drive device of one embodiment of the present disclosure includes a first component and a second component. The second component is fixed to the first component by inserting a shaft body from a second hole formed in the second component into a first hole formed in the first component. The first component and the second component are provided with a positioning structure for aligning the second component with respect to the first component. In the positioning structure, a margin is provided with a range in which the first hole can be visually confirmed through the second hole as a limit. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a perspective view of the motor drive device according to the present embodiment.

[0011] Figure 2 It is shown Figure 1 A three-dimensional view showing a state in which the substrate is removed relative to the housing.

[0012] Figure 3 It is shown Figure 1 Cross-sectional view of the protrusion and the supporting hole.

[0013] Figure 4 It is shown Figure 1 Cross-sectional view of the screw holes and through holes.

[0014] Figure 5 It is a perspective view schematically showing a housing and a substrate of the motor drive device according to the present embodiment.

[0015] Figure 6 yes Figure 5 A top view of the second component.

[0016] Figure 7 It is a perspective view schematically showing a housing and a substrate of a motor drive device according to a second embodiment.

[0017] Figure 8 yes Figure 7 A top view of the second component.

[0018] Fig. 9 It is a perspective view showing a state in which a motor drive device according to a third embodiment is exploded.

[0019] Fig.10 yes Fig. 9 A top view of the second component.

[0020] Fig.11 It is a perspective view showing a state in which a motor drive device according to a fourth embodiment is exploded. DETAILED DESCRIPTION

[0021] Below, while referring to the attached Figure 1 In the following description, components having substantially the same function and structure are denoted by the same reference numerals, and repeated description is given only when necessary.

[0022] A feature of the motor drive device of the embodiment of the present invention is that a positioning structure is directly provided on the components constituting the motor drive device so that the motor drive device can be easily assembled. Thus, since the components can be easily aligned with each other without using a separate positioning fixture during the assembly operation, the motor drive device can be efficiently assembled.

[0023] In the embodiment of the present invention, a screw is used as a fastening member for fastening two components constituting the motor drive device. However, the fastening member is not limited to a screw, and for example, a shaft body such as a bolt or a rivet can be used.

[0024] In an embodiment of the present invention, one of the first and second components constituting the motor drive device has a screw hole (corresponding to the first hole) for fastening a screw, and the other has a through hole (corresponding to the second hole) for passing the screw. The second component is fixed to the first component by inserting the screw from the through hole penetrated in the second component into the screw hole penetrated in the first component and fastening it. However, in the case of using a rivet as a fastening member, the screw hole is replaced by a through hole for passing the rivet. In this way, depending on the fastening member used, a screw hole, a through hole, etc. can be used as the first hole.

[0025] In the embodiment of the present invention, the motor drive device is described as an example, but the embodiment of the present invention can be widely applied to various devices and mechanisms having two components fixed to each other by using a shaft body such as a screw, a bolt, or a rivet.

[0026] Below, refer to Figure 1 , Figure 2 , a motor drive device according to a first embodiment is described. Figure 1 It is a perspective view showing the motor drive device according to the first embodiment. Figure 2 yes Figure 1 Exploded perspective view of the motor drive device. Figure 1 , Figure 2 As shown, the motor driving device 1 includes a housing 10 having an upper opening and a rectangular box shape in a plan view, a housing cover 50 covering the upper opening of the housing 10 , and a substrate 30 on which electronic components (not shown) for driving a motor (not shown) are mounted.

[0027] In addition, for the sake of convenience, three orthogonal axes are defined as follows. That is, the axis parallel to the short side of the housing 10 is set as the X1 axis, the axis parallel to the long side of the housing 10 is set as the Y1 axis, and the axis orthogonal to the X1 axis and the Y1 axis and parallel to the thickness direction of the housing 10 is set as the Z1 axis. The direction along the Z1 axis is called the up-down direction. The direction in which the substrate 30 is mounted on the housing 10 (mounting direction) is parallel to the Z1 axis.

[0028] like Figure 1 , Figure 2As shown, the housing 10 has a plurality of protrusions 11 protruding upward, two protrusions in this case, a screw hole 13 for fastening the screw 20 for fixing the substrate 30 to the housing 10, and a screw hole 15 for fastening the screw 40 for fixing the housing cover 50 to the housing 10. The screw hole 13 for fastening the substrate is distinguished as a substrate screw hole 13, and the screw hole 15 for the housing cover is distinguished as a cover screw hole 15. The substrate screw hole 13 and the cover screw hole 15 are arranged in a direction in which their center lines are parallel to the Z1 axis. The substrate 30 has two receiving holes 31 that respectively receive the two protrusions 11 arranged on the housing 10. The receiving hole 31 is a through hole that passes through the substrate 30 from top to bottom, and is arranged in a direction in which its center line is parallel to the Z axis. In addition, the substrate 30 has a circular through hole 33 for inserting the screw for fixing the substrate 30 to the housing 10.

[0029] Reference Figure 3 , Figure 4 , the details of the protrusion 11 and the receiving hole 31 are described.

[0030] like Figure 3 As shown, typically, the protrusion 11 is configured as a cylinder that is longer than the thickness of the substrate 30. Preferably, the outer diameter of the protrusion 11 is larger than the inner diameter of the through hole 33 to prevent the protrusion 11 from being mistakenly inserted into the through hole 33 of the substrate 30. In order to make it easy for the protrusion 11 to pass through the receiving hole 31, the upper part of the protrusion 11 has a tapered shape that tapers toward the front end. Of course, the protrusion 11 can also be configured as a cylinder that tapers gradually toward the front end as a whole. In order to achieve the same effect, the opening of the receiving hole 31 on the back side of the substrate 30 opposite to the housing 10 can be made larger than the opening of the receiving hole 31 on the front side of the substrate 30.

[0031] like Figure 3 (a) Figure 3 As shown in (b), the receiving hole 31 has an inner diameter UD (UDmax, UDmin) greater than the maximum outer diameter TD of the protrusion 11. The larger the inner diameter UD of the receiving hole 31 relative to the outer diameter TD of the protrusion 11, the larger the gap (called margin) between the outer peripheral surface of the protrusion 11 and the inner peripheral surface of the receiving hole 31.

[0032] Since the larger the margin is, the more efficient the alignment operation is, the more efficient the alignment operation is. On the other hand, since the positional offset of the substrate 30 relative to the housing 10 becomes larger, it is sometimes impossible to visually confirm the substrate screw hole 13 of the housing 10 through the through hole 33 of the substrate 30 after the alignment operation. During the screw tightening operation, in order to make the through hole 33 of the substrate 30 consistent with the substrate screw hole 13 of the housing 10, it is necessary to move the substrate 30 to adjust the position of the substrate 30 relative to the housing 10. If the substrate screw hole 13 cannot be visually confirmed through the through hole 33, it is necessary to move the substrate 30 in various directions until the substrate screw hole 13 can be seen through the through hole 33 because it is unknown in which direction the substrate 30 should be moved. This reduces the efficiency of the screw tightening operation.

[0033] As the margin is smaller, the substrate 30 and the housing 10 must be positioned more accurately, so the efficiency of the alignment work is reduced. On the other hand, since the positional deviation of the substrate 30 relative to the housing 10 is reduced, the through hole 33 of the substrate 30 may also coincide with the substrate screw hole 13 of the housing 10. In this case, during the screw tightening work, since there is no need to adjust the position of the substrate 30 relative to the housing 10, the reduction in the efficiency of the screw tightening work can be suppressed.

[0034] In this way, if the inner diameter of the bearing hole 31 constituting the alignment structure is too large, the operating efficiency of the screw tightening operation may be reduced, and if it is too small, the operating efficiency of the alignment operation may be reduced. In the motor drive device 1 of the first embodiment, the inner diameter of the bearing hole 31 constituting the alignment structure is designed to take into account both the operability of the alignment operation and the operability of the screw tightening operation. Specifically, the upper limit value (maximum inner diameter UDmax) and the lower limit value (UDmin) of the inner diameter UD of the bearing hole 31 are determined as follows. A feature of the first embodiment is that the upper limit value (maximum inner diameter UDmax) and the lower limit value (UDmin) of the inner diameter UD of the bearing hole 31 are specified not only by the outer diameter TD of the protrusion 11 provided on the housing 10, but also by the inner diameter ND of the substrate screw hole 13 provided on the substrate 30 and the inner diameter SD of the through hole 33 provided on the housing 10.

[0035] like Figure 3 As shown in (a) of FIG. 1 , the maximum inner diameter UDmax of the receiving hole 31 is set to the value of the outer diameter TD of the protrusion 11 plus twice the maximum margin Mmax. The maximum margin Mmax corresponds to the maximum value (maximum allowable offset) Smax of the positional offset allowance of the through hole 33 relative to the screw hole 13 for the substrate. Figure 4As shown in (b), the maximum allowable deviation Smax can be calculated using the calculation formula ((SD+ND) / 2). That is, the maximum inner diameter UDmax of the receiving hole 31 is set to the value obtained by adding the inner diameter SD of the through hole 33 and the inner diameter ND of the substrate screw hole 13.

[0036] In addition, if Figure 4 As shown in (a), the inner diameter SD of the through hole 33 is larger than the inner diameter ND of the substrate screw hole 13. The maximum allowable offset Smax corresponds to the limit value of the positional offset of the through hole 33 relative to the substrate screw hole 13, at which the operator can visually confirm a part of the substrate screw hole 13 through the through hole 33.

[0037] By making the inner diameter UD of the receiving hole 31 smaller than the maximum inner diameter UDmax, the operator can at least visually confirm the substrate screw hole 13 through the through hole 33. Thus, even if the through hole 33 and the substrate screw hole 13 do not coincide with each other after alignment, the operator can immediately understand in which direction the substrate 30 should be moved relative to the housing 10 in order to make the through hole 33 coincide with the substrate screw hole 13. Therefore, compared with the case where the substrate screw hole 13 cannot be visually confirmed through the through hole 33, the reduction in the working efficiency of the screw tightening operation can be suppressed.

[0038] like Figure 3 As shown in (b) of FIG. 1 , the minimum inner diameter UDmin of the receiving hole 31 is set to the value of the outer diameter TD of the protrusion 11 plus twice the minimum margin Mmin. The minimum margin Mmin corresponds to the minimum value (minimum allowable offset) Smin of the positional offset of the through hole 33 relative to the screw hole 13 for the substrate. Figure 4 As shown in (c) in FIG. 1 , the minimum allowable offset Smin can be calculated using the calculation formula ((SD-ND) / 2). That is, the minimum inner diameter UDmin of the receiving hole 31 is set to the value obtained by adding the difference between the inner diameter SD of the through hole 33 and the inner diameter ND of the substrate screw hole 13. The minimum allowable offset Smin corresponds to the maximum value of the positional offset of the through hole 33 relative to the substrate screw hole 13, which allows the operator to visually confirm the entirety of the substrate screw hole 13 through the through hole 33.

[0039] When the inner diameter UD of the receiving hole 31 is the minimum inner diameter UDmin, after the substrate 30 is aligned with the housing 10, since the operator can visually confirm the entirety of the substrate screw hole 13 through the through hole 33, the operator can perform the screw-tightening operation of the substrate 30 with respect to the housing 10 without moving the substrate 30 while maintaining the aligned state. That is, the operator can perform the screw-tightening operation with the same operability as when the inner diameter UD of the receiving hole 31 is consistent with the outer diameter TD of the protrusion 11. On the other hand, since the inner diameter UD of the receiving hole 31 is larger than the outer diameter TD of the protrusion 11, it is easier to insert the protrusion 11 into the receiving hole 31 than when the inner diameter UD of the receiving hole 31 is consistent with the outer diameter TD of the protrusion 11, and the decrease in the operating efficiency of the alignment operation of the substrate 30 with respect to the housing 10 can be suppressed.

[0040] Therefore, by making the inner diameter UD of the receiving hole 31 constituting the alignment structure greater than the minimum inner diameter UDmin and less than the maximum inner diameter UDmax, the reduction in the operating efficiency of the screw tightening operation can be suppressed compared with the case where the substrate screw hole 13 cannot be visually confirmed through the through hole 33, and the reduction in the operating efficiency of the alignment operation can be suppressed compared with the case where the inner diameter UD of the receiving hole 31 is consistent with the outer diameter TD of the protrusion 11. In other words, the operability of the alignment operation and the operability of the screw tightening operation can be taken into account. In addition, for example, if only the operability of the screw tightening operation is considered, such as the case where the alignment operation is performed by a robot and the screw tightening operation is performed by an operator, the inner diameter UD of the receiving hole 31 constituting the alignment structure can be less than the maximum inner diameter UDmax, and may not be greater than the minimum inner diameter UDmin.

[0041] Typically, the two receiving holes 31 provided on the substrate 30 are respectively arranged at positions satisfying the three arrangement conditions. Figure 5 , Figure 6 , the configuration conditions are described. Here, for the sake of simplicity, it is assumed that the second component 90 in the shape of a rectangular plate is aligned with the first component 70. The first component 70 schematically represents the housing 10, and the second component 90 schematically represents the substrate 30. The protrusion 11 of the housing 10 corresponds to the protrusion 71 of the first component 70, and the receiving hole 31 of the substrate 30 corresponds to the receiving hole 91 of the second component 90. The center position C1 of the second component 90 corresponds to the center of the width and the center of the length of the second component 90.

[0042] Arrangement Condition 1. The two receiving holes 91 are arranged at positions that are not line-symmetrical with respect to the axis Xc1 that passes through the center position C1 of the second member 90 and is parallel to the short side of the second member 90 .

[0043] Arrangement condition 2. The two receiving holes 91 are arranged at positions that are not line-symmetrical with respect to an axis Yc1 that passes through the center position C1 of the second member 90 and is parallel to the long side of the second member 90 .

[0044] Arrangement condition 3. The two receiving holes 91 are arranged at positions that are not point-symmetrical with respect to the center position C1 of the second member 90 .

[0045] like Figure 6 As shown, by arranging the two receiving holes 91 at positions that satisfy the above three arrangement conditions, the following effects are achieved. That is, when the second component 90 is arranged upside down or front-to-back with respect to the first component 70, since the protrusion 71 of the first component 70 does not pass through the receiving holes 91 of the second component 90 and interferes with the back side, the second component 90 cannot be fixed to the first component 70 by screws. In other words, it is possible to physically avoid the second component 90 being mounted to the first component 70 in the wrong direction.

[0046] According to the motor drive device 1 of the first embodiment, the following effects can be achieved. That is, by directly providing the protrusion 11 and the receiving hole 31 constituting the alignment structure on the housing 10 and the substrate 30 constituting the motor drive device 1, respectively, the operator can align the housing 10 and the substrate 30 with less working hours without using a separate alignment fixture, thereby improving the working efficiency of the assembly operation of the motor drive device 1.

[0047] In addition, by determining the upper and lower limits of the size of the receiving hole 31 constituting the alignment structure, the size of the receiving hole 31 has a margin, thereby taking into account the operability of the alignment operation and the operability of the screw tightening operation. This also helps to improve the efficiency of the assembly operation of the motor drive device 1.

[0048] In addition, two protrusions 11 and receiving holes 31 constituting the alignment structure are respectively provided on the housing 10 and the substrate 30, and the two receiving holes 31 provided on the substrate 30 are arranged at positions that meet the three arrangement conditions. Thus, it is physically possible to avoid the situation where the substrate 30 is installed in the housing 10 in the wrong direction. This also helps to improve the efficiency of the assembly operation of the motor drive device 1.

[0049] In the first embodiment, the housing 10 is configured to have the protrusion 11 and the substrate 30 is configured to have the receiving hole 31. However, as a modified example of the first embodiment, the housing 10 may have the receiving hole and the substrate 30 may have the protrusion. Even in such a case, the same effect as the first embodiment is achieved. In this case, it is preferred that the outer diameter of the protrusion is larger than the inner diameter of the screw hole to prevent the protrusion of the substrate 30 from being mistakenly inserted into the screw holes 13 and 15 of the housing 10.

[0050] The motor drive device 1 of the first embodiment has two sets of protrusions and receiving holes as the alignment structure. However, the motor drive device 1 of the first embodiment may also have three or more sets of protrusions and receiving holes as the alignment structure. By having three or more sets of protrusions and receiving holes as the alignment structure, the risk of mistaking the installation direction of the substrate 30 relative to the housing 10 is lower than that of the structure having two sets because the position of the substrate 30 relative to the housing 10 is uniquely determined.

[0051] In the motor drive device 1 of the first embodiment, the protrusion 11 is configured as a cylinder, and the receiving hole 31 is configured as a circle matching the protrusion 11. However, the protrusion 11 is not limited to a cylinder, but may be a cylinder having any cross-sectional shape such as an elliptical cylinder, an elongated cylinder, or a polygonal cylinder.

[0052] Below, refer to Figure 7 , Figure 8 , the motor drive device 2 of the second embodiment is described. Here, in order to simplify the description, it is assumed that the second member 110 in a rectangular plate shape is aligned with the first member 100 as in the first embodiment. Figure 7 , Figure 8 As shown, the first component 100 has a protrusion 101 protruding upward and a screw hole 105 for fastening a screw for fixing the second component 110 to the first component 100. The protrusion 101 is configured as a triangular prism. In order to make it easy for the protrusion 101 to pass through the receiving hole 111, the upper part of the protrusion 101 has a tapered shape that becomes thinner toward the front end. The second component 110 has a triangular receiving hole 111 that receives the protrusion 101 and a through hole 115 for passing a screw for fixing the second component 110 to the first component 100. The center position C of the second component 110 corresponds to the center of the width and the center of the length of the second component 110.

[0053] Similar to the first embodiment, the inner diameter of the receiving hole 111 is larger than the outer diameter of the protrusion 101 , and its maximum value (maximum inner diameter) and minimum value (minimum inner diameter) can be calculated using the same method as the first embodiment.

[0054] The receiving hole 111 is preferably arranged at a position other than the symmetry axis of the second component 110 or the center position of the second component 110. Specifically, the receiving hole 111 is arranged at a position other than the position on the axis Xc2 passing through the center position C2 of the second component 110 and parallel to the short side of the second component 110, the position on the axis Yc2 passing through the center position C2 of the second component 110 and parallel to the long side of the second component, and the center position C2 of the second component 110. Therefore, in order to make the through hole 115 of the second component 110 consistent with the screw hole 105 of the first component 100, when the second component 110 is aligned with the first component 100, if the second component 110 is in an incorrect orientation such as upside down or upside down, the protrusion 101 of the first component 100 cannot be inserted into the receiving hole 111 of the second component 110, and the protrusion 101 of the first component 100 will interfere with the second component 110.

[0055] Since the number of protrusions provided on the first component 100 is one, the second component 110 can be mounted to the first component 100 in a wrong orientation. However, even if the second component 110 is mounted to the first component 100 in a wrong orientation such as upside down or upside down, the second component 110 is significantly offset relative to the first component 100, and the through hole 115 of the second component 110 is not consistent with the screw hole 105 of the first component 100. Since the operator can easily grasp the situation that the second component 110 is aligned in the wrong orientation, the situation that the second component 110 is mounted to the first component 100 in the wrong orientation can be avoided.

[0056] According to the motor drive device 2 of the second embodiment, the same effect as the motor drive device 1 of the first embodiment can be achieved. In addition, the motor drive device 2 of the second embodiment has a set of protrusions 101 and receiving holes 111 constituting the alignment structure. On the other hand, the motor drive device 1 of the first embodiment has two sets of protrusions 11-receiving holes 31 constituting the alignment structure. Therefore, from the perspective of minimizing the space for setting the alignment structure, the second embodiment has an advantage over the first embodiment. On the other hand, from the perspective of the durability of the alignment structure, specifically, from the perspective of the resistance to the load that the protrusions 11, 101 receive from the substrate 30 during the alignment operation, since the load can be dispersed by two protrusions 11, the first embodiment has an advantage over the second embodiment having one protrusion 101.

[0057] In the first and second embodiments, the alignment structure is composed of a protrusion and a receiving hole, each of which is provided on two parts of the alignment object. However, the configuration of the alignment structure is not limited to this. For example, in the viewpoint of aligning two parts without using a fixture for alignment, it is possible to configure that only one of the two parts of the alignment object has a structure for alignment.

[0058] Reference Fig. 9 , Fig.10 , a motor drive device according to a third embodiment is described. Fig. 9 As shown, the motor drive device 3 of the third embodiment includes a plate-shaped first component 120 and a rectangular second component 130 in a plan view. The second component 130 is aligned with the first component 120 and fixed by screws 20. Fig. 9 As shown, the first component 120 has a plurality of, here four, protrusions 121 as a positioning structure for aligning the second component 130 relative to the first component 120. Typically, the protrusions 121 are configured as cylinders. The four protrusions 121 are arranged at positions that meet the configuration conditions on the front side of the first component 120 against which the second component 130 abuts.

[0059] Below, refer to Fig.10 , the arrangement conditions of the four protrusions 121 are described. In addition, the outer periphery of the contact surface of the second component 130 that contacts the first component 120 is indicated by reference numeral 130, and the center of the width and the center of the length of the second component 130, that is, the center position of the second component 130 is indicated by reference numeral C3. In addition, the axis passing through the center position C3 and parallel to the long side of the contact surface of the second component 130 is indicated by reference numeral Xc3, and the axis passing through the center position C3 and parallel to the short side of the contact surface of the second component 130 is indicated by reference numeral Yc3.

[0060] Arrangement condition 1: The four protrusions 121 are respectively arranged along the outer periphery 130 a of the contact surface of the second member 130 that contacts the first member 120 .

[0061] Arrangement condition 2: The four protrusions 121 are respectively arranged on four sides of the outer periphery 130 a of the contact surface of the second member 130 that contacts the first member 120 .

[0062] Arrangement condition 3: at least two protrusions 121 are arranged in at least one of the four sections defined by axis Xc3 and axis Yc3, wherein axis Xc3 is an axis passing through the center position C3 and parallel to the long side of the contact surface of the second component 130, and axis Yc3 is an axis passing through the center position C3 and parallel to the short side of the contact surface of the second component 130. Fig.10 In the embodiment, two protrusions 121 are respectively arranged in two of the four partitions.

[0063] By placing the four protrusions 121 at positions satisfying the arrangement condition 1, the second member 130 is inserted into the frame defined by the four protrusions 121 of the first member 120, thereby defining the position of the second member 130 relative to the first member 120. In addition, by placing the four protrusions 121 at positions satisfying the arrangement conditions 1 and 2, the movement of the aligned second member 130 along the axis Xc3 and the axis Yc3 can be stopped. In addition, by placing the four protrusions 121 at positions satisfying the arrangement conditions 1, 2, and 3, the rotation of the aligned second member 130 around the axis orthogonal to the front surface of the first member 120 can be stopped.

[0064] According to the motor drive device 3 of the third embodiment, the second component 130 can be aligned relative to the first component 120 without using a positioning fixture, and the second component 130 can be fixed to the first component 120 by inserting the screw 20 into the screw hole 125 of the first component 120 and the through hole 135 of the second component 130 and tightening them.

[0065] In the third embodiment, the first member 120, one of the two members to be aligned, has a plurality of protrusions 121 as an alignment structure. However, the alignment structure of one of the two members to be aligned is not limited to a plurality of protrusions.

[0066] Reference Fig.11 , a motor drive device 4 according to a fourth embodiment will be described. Fig.11 As shown, the motor drive device 4 of the fourth embodiment includes a plate-shaped first component 140 and a rectangular second component 150 in a plan view. The second component 150 is aligned with the first component 140 and fixed by screws 20. Fig.11 As shown, the first component 140 has a recess 141 for receiving the second component 150 as a positioning structure for positioning the second component 150 relative to the first component 140. The recess 141 has an inner peripheral shape matching the outer peripheral shape of the abutting surface of the second component 150 abutting against the first component 140.

[0067] By fitting the second component 150 into the recess 141 of the first component 140 , the position of the second component 150 relative to the first component 140 can be defined, and the movement of the second component 150 relative to the first component 140 in the X4 direction and the Y4 direction and the rotation around the Z4 axis can be locked.

[0068] According to the motor drive device 4 of the fourth embodiment, the second component 150 can be aligned relative to the first component 140 without using a positioning fixture, and the second component 150 can be fixed to the first component 140 by inserting the screw 20 into the screw hole 145 of the first component 140 and the through hole 155 of the second component 150 and tightening them.

[0069] Although the embodiments of the present disclosure are described in detail, the present disclosure is not limited to the above-mentioned embodiments. These embodiments may be variously added, replaced, changed, partially deleted, etc. without departing from the scope of the invention, or without departing from the idea and purpose of the present invention derived from the contents recorded in the claims and their equivalents. For example, in the above-mentioned embodiments, the order of each action or the order of each process is shown only as an example and is not limited thereto. In addition, the same is true when numerical values ​​or formulas are used in the description of the above-mentioned embodiments.

[0070] Description of Reference Numerals

[0071] 1: Motor drive device,

[0072] 10: Shell,

[0073] 11: protrusion,

[0074] 13: Screw holes for substrate,

[0075] 15: Screw holes for cover,

[0076] 20, 40: screws,

[0077] 30: substrate,

[0078] 31: Socket hole,

[0079] 33: Through hole,

[0080] 50: Shell cover,

[0081] 55: Through hole.

Claims

1. A motor drive device, wherein: having a first component and a second component, The second component is fixed to the first component by inserting the shaft from the second hole formed in the second component into the first hole formed in the first component. The first component and the second component are provided with a positioning structure for aligning the second component with respect to the first component. In the alignment structure, a margin is provided with a limit of a range in which the first hole can be visually confirmed through the second hole.

2. The motor drive device according to claim 1, wherein: The first component or the second component has at least one protrusion as the alignment structure, The second component or the first component has at least one receiving hole as the alignment structure. The receiving hole has an inner diameter that enables visual confirmation of the first hole through the second hole.

3. The motor drive device according to claim 2, wherein: The inner diameter of the receiving hole is greater than the length obtained by adding the maximum outer diameter of the protrusion to the difference between the inner diameters of the first hole and the second hole, and is smaller than the length obtained by adding the maximum outer diameter of the protrusion to the inner diameters of the second hole and the inner diameters of the first hole.

4. The motor drive device according to claim 2 or 3, wherein: The first component has the protrusion, and the second component has the receiving hole. The protrusion has an outer diameter greater than an inner diameter of the second hole.

5. The motor drive device according to claim 2 or 3, wherein: The first component has the receiving hole, and the second component has the protrusion. The protrusion has an outer diameter greater than an inner diameter of the first hole.

6. The motor drive device according to claim 2, wherein: The first component or the second component has two protrusions as the alignment structure, The second component or the first component has two bearing holes as the alignment structure. The two receiving holes of the first component or the second component are respectively arranged at positions that are not point-symmetrical with respect to the center position of the second component and are not line-symmetrical with respect to any axis passing through the center position of the second component.

7. The motor drive device according to claim 2, wherein: The first component or the second component has a protrusion as the alignment structure, The second component or the first component has a bearing hole as the alignment structure, The protrusion is configured as a columnar body with a non-circular cross section, and the receiving hole has a non-circular inner diameter matching the outer diameter of the protrusion.

8. The motor drive device according to any one of claims 2 to 7, wherein: The protrusion has a tapered shape that becomes thinner toward the front end.

9. A motor drive device, wherein: having a first component and a second component, The second component is fixed to the first component by inserting the shaft from the second hole formed in the second component into the first hole formed in the first component. The first member has a plurality of protrusions that receive an outer peripheral surface of the second member as a positioning structure for positioning the second member relative to the first member.

10. A motor drive device, wherein: having a first component and a second component, The second component is fixed to the first component by inserting the shaft from the second hole formed in the second component into the first hole formed in the first component. The first component has a recess for accommodating the second component as a positioning structure for positioning the second component relative to the first component.

Images