JP2018133938A - Motor cover and actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a motor cover and an actuator that chips do not drop into the motor cover and scatter, when assembling the motor cover with a self-tapping screw.SOLUTION: A motor cover body consists of a first cover member and a second cover member, which are integrated via an engaging part. The engaging part consists of a substantially C-shaped groove, and a protrusion closing an opening thereof. The substantially C-shaped groove is formed on any one of the first and second cover members, and the protrusion is formed on the other of the first and second cover members. A tapped part is provided in the substantially C-shaped groove, and by screwing a self-tapping screw to the tapped part, one of the first and second cover members is fixed to the other of the first and second cover members.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a motor cover and an actuator, and more particularly to a device designed to prevent chips from falling and scattering in the motor cover when the motor cover is assembled with a self-tapping screw.

For example, Patent Document 1 discloses a case structure that houses a circuit board on which electronic components are mounted. The case structure described in Patent Document 1 is generally configured as follows.
First, there is a body having a U-shaped cross section, and a circuit board on which electronic components are mounted is accommodated in the body. A fixing plate is attached to each end opening of the body.
That is, a C-shaped groove opened inward is provided in the lower left and right corners of the body in an extended state in the longitudinal direction, and an internal thread portion is formed on the inner surface thereof. On the other hand, through holes are formed in the lower left and right corners of the fixed plate.

  The left and right assembly screws are screwed into the female threaded portion of the C-shaped groove through the through-holes, thereby fixing the fixing plate to both openings of the body.

JP 2008-270288 A

The conventional configuration has the following problems.
That is, when the assembly screw is screwed into the female screw portion of the C-shaped groove through the through hole, wear powder or the like may fall and scatter in the body, and is mounted on the circuit board or circuit board that is housed. There has been a problem of adversely affecting various electronic components.
The above problem is remarkable when the assembly screw is a self-tapping screw. That is, since the female thread portion is not formed in advance in the C-shaped groove and is screwed into the C-shaped groove by self-tapping with the assembly screw, a large amount of chips are generated and dropped into the body.・ It will be scattered.

  The present invention has been made based on such points, and an object thereof is to provide a motor cover and an actuator in which chips do not fall and scatter in the motor cover when the motor cover is assembled with a self-tapping screw.

In order to solve the above problems, a motor cover according to claim 1 of the present invention includes a motor cover body, and the motor cover body includes a first cover member and a second cover member, and the first cover member and the second cover member. The cover member is integrated through an engaging portion, and the engaging portion includes a substantially C-shaped groove and a convex portion that closes the opening of the substantially C-shaped groove. The substantially C-shaped groove is formed in one of the one cover member and the second cover member, and the convex portion is formed in either one of the first cover member and the second cover member. A tapped portion is provided in the substantially C-shaped groove, and one of the first cover member and the second cover member is fixed to the other by screwing a self-tapping screw into the tapped portion. It is characterized by.
According to a second aspect of the present invention, in the motor cover according to the first aspect, by engaging the two sides of the first cover member with the two sides of the second cover member, the motor cover body is formed into a cylindrical shape. The substantially C-shaped groove is formed on one of the two sides of either the first cover member or the second cover member, and the first cover member and the second cover member The convex portions are formed on either of the other two sides.
According to a third aspect of the present invention, in the motor cover according to the second aspect, the substantially C-shaped groove is formed in the entire area of the two sides, and the convex portion is formed in the entire area of the two sides. It is a feature.
The motor cover according to claim 4 is the motor cover according to any one of claims 1 to 3, wherein the opening of the substantially C-shaped groove is formed toward the outside of the motor cover main body. It is a feature.
A motor cover according to claim 5 is the motor cover according to any one of claims 1 to 3, wherein the opening of the substantially C-shaped groove is formed toward the inside of the motor cover main body. It is a feature.
A motor cover according to a sixth aspect of the present invention is the motor cover according to any one of the first to fifth aspects, wherein the cover member on which the convex portion is formed has a direction of narrowing the opening of the substantially C-shaped groove. A built-up portion for biasing is provided.
A motor cover according to a seventh aspect of the present invention is the motor cover according to any one of the first to sixth aspects, wherein a circuit board is provided in the motor cover main body.
According to an eighth aspect of the present invention, an actuator includes the motor cover according to any one of the first to seventh aspects.

As described above, according to the motor cover according to the first aspect of the present invention, the motor cover main body is provided, and the motor cover main body includes the first cover member and the second cover member, and the first cover member and the second cover member. The cover member is integrated through an engaging portion, and the engaging portion includes a substantially C-shaped groove and a convex portion that closes the opening of the substantially C-shaped groove. The substantially C-shaped groove is formed in one of the one cover member and the second cover member, and the convex portion is formed in either one of the first cover member and the second cover member. The substantially C-shaped groove is provided with a tapped portion, and one of the first cover member and the second cover member is fixed to the other by screwing a self-tapping screw into the tapped portion. Since it is configured, the cut that occurs during self-tapping Can be prevented from falling or scattering into the motor cover, and the internal motor can be prevented from being adversely affected by the chips, and if the circuit board is provided, the circuit board and the circuit board can be prevented. It is possible to prevent various electric / electronic components mounted on the board from being adversely affected by chips.
According to the motor cover according to claim 2, in the motor cover according to claim 1, the motor cover main body has a cylindrical shape by engaging the two sides of the first cover member and the two sides of the second cover member. The substantially C-shaped groove is formed on either one of the first cover member and the second cover member, and the first cover member and the second cover member are formed. Since either of the other two sides is configured to have the convex portions, the same effects as described above can be obtained.
According to a motor cover according to claim 3, in the motor cover according to claim 2, the substantially C-shaped groove is formed in the entire area of the two sides, and the convex portion is formed in the entire area of the two sides. Therefore, it is possible to prevent the surroundings from becoming dirty due to the falling and scattering of the chips, and in particular, since the substantially C-shaped groove and the convex portion are provided in the entire area, the chips are scattered around. It can be surely prevented.
According to a motor cover according to claim 4, in the motor cover according to any one of claims 1 to 3, the opening of the substantially C-shaped groove is formed toward the outside of the motor cover main body. The above-described effects can be made more reliable.
Further, according to the motor cover according to claim 5, in the motor cover according to any one of claims 1 to 3, the opening of the substantially C-shaped groove is formed toward the inside of the motor cover main body. Even with such a configuration, the same effect can be obtained.
According to a motor cover according to a sixth aspect, in the motor cover according to any one of the first to fifth aspects, an opening portion of the substantially C-shaped groove is narrowed in the cover member on which the convex portion is formed. Since the built-up portion that is urged in the direction is provided, the opening can be narrowed to obtain a stronger fixed state.
According to a motor cover according to claim 7, in the motor cover according to any one of claims 1 to 6, since the motor cover body includes a circuit board, the circuit cover is mounted on the circuit board. Various electric / electronic components can be prevented from being adversely affected by chips.
Further, according to the actuator of the eighth aspect, since the motor cover according to any one of the first to sixth aspects is provided, an actuator that can provide the above-described effect can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one embodiment of this invention, and is the perspective view which looked at the whole actuator from the motor cover side. FIG. 2 is a diagram showing an embodiment of the present invention, and is a perspective view of the entire actuator as viewed from the non-motor cover side. It is a figure which shows one embodiment of this invention, and is III-III sectional drawing of FIG. It is a figure which shows one embodiment of this invention, and is IV-IV sectional drawing of FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one embodiment of this invention, and is a disassembled perspective view which shows the motor cover main body of a motor cover, and the structure of a periphery. It is a figure which shows one embodiment of this invention, and is an exploded perspective view which shows a mode that a circuit board is internally accommodated in the motor cover main body of a motor cover. It is a figure which shows one embodiment of this invention, and is an exploded perspective view which shows the relationship between the motor cover main body and motor cover cap of a motor cover. It is a figure which shows one embodiment of this invention, and is a front view which shows the state which removed the motor cover cap from the motor cover main body of the motor cover.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
First, there is a base 1, and this base 1 is composed of a bottom wall 3 and side walls 5 and 7 erected on both the left and right sides of the bottom wall 3. A front cap 9 is attached to one end (left end in FIG. 3) of the base 1, and a bearing support member 11 is attached to the other end (right end in FIG. 3). An opening 12 is formed on the upper surface side of the base 1. Stopper screws 4 and 4 are attached to the bottom wall 3.

  As shown in FIG. 3, a ball screw shaft 13 is internally provided in the base 1, and a spiral groove 15 is formed on the outer periphery of the ball screw shaft 13. Bearings 17 and 19 are housed in the bearing support member 11, and the other end (right end in FIG. 3) of the ball screw shaft 13 is pivotally supported by these bearings 17 and 19. On the other hand, one end (the left end in FIG. 3) of the ball screw shaft 13 is a free end and is in a so-called cantilever state.

  A ball screw nut 21 is screwed and disposed on the ball screw shaft 13 in a state in which the rotation is restricted. A spiral groove 23 is formed on the inner surface of the ball screw nut 21. The ball screw nut 21 includes a ball screw nut body 25 and end caps 27 and 29 attached to both ends of the ball screw nut 25.

  The ball screw nut body 25 is formed with a no-load circulation path (not shown), and the end caps 27 and 29 are formed with return paths (not shown). Between the spiral groove 15 of the ball screw shaft 13 and the spiral groove 23 of the ball screw nut 21, one return path, no-load circulation path, and the other return path constitute a ball circulation path. A plurality of balls 31 circulate in the circulation path. Thereby, the operation of the ball screw shaft 13 and the ball screw nut 21 is made smooth.

  A slider 33 is attached to the ball screw nut 21. The slider 33 includes a slider body 34 and end caps 36 and 36 at both ends. As shown in FIG. 4, guide rails 32 and 32 are attached to the left and right sides of the slider body 34, and guide rails 40 and 40 are also attached to the side walls 5 and 7 of the base 1. . In addition, unloaded circulation paths 44 and 44 are formed on the left and right sides of the slider body 34, respectively. The end caps 36, 36 also have return paths (not shown) on the left and right.

  And between the left and right guide rails 32, 32 on the slider body 34 side and the guide rails 40, 40 on the side walls 5, 7, the left and right return paths of one end cap, the left and right no-load circulation paths 44 of the slider body, 44, the left and right return paths of the other end cap form a ball circulation path on the left and right, respectively. A plurality of balls 46 are circulated in both the ball circulation paths. Thereby, the operation of the slider 33 is made smooth.

  The opening 12 of the base 1 already described is closed by the stainless sheet 37. The stainless steel sheet 37 is installed in a state of being inserted between the sheet sliders 34 a and 34 a of the slider body 34 and the slider cover 35. Further, one end (left end in FIG. 3) of the stainless steel sheet 37 is fixed to the base 1 inside the front cap 9 and the other end (right end in FIG. 2) is fixed to the fixing plate 46 and fixing screws 48 and 48. The bearing support member 11 has already been fixed. The left and right parts of the slider 33 are exposed upward from the slider cover 35 and serve as device mounting seats 38 and 38. Each of the device mounting seats 38, 38 is provided with three female screw portions 38a. Various devices (not shown) are mounted on these device mounting seats 38, 38 using the female screw portion 38a.

  A motor cover 41 is detachably attached to the right side of the bearing support member 11 in FIG. A drive motor 43 is built in the motor cover 41. The output shaft 45 of the drive motor 43 and the previously described ball screw shaft 13 are connected via an Oldham coupling 47. The Oldham coupling 47 includes a ball screw shaft side element 49, a drive motor side element 51, and an intermediate disk 53 interposed between the ball screw shaft side element 49 and the drive motor side element 51. The drive motor 43 is provided with an encoder 55.

  The motor cover 41 includes a hollow motor cover main body 57 and a motor cover cap 59 attached to and detached from the right end of the motor cover main body 57 in FIG. As shown in FIG. 7, the motor cover main body 57 includes an upper cover member 61 and a lower cover member 63.

  As shown in FIGS. 5 to 7, the upper cover member 61 has an inverted U-shaped cross section, and includes a ceiling wall 65 and left and right side walls 67 and 67. In addition, C-shaped grooves 69 and 69 that open toward the inside are formed in the upper portion of the upper cover member 61 at both left and right corners in an extended state in the longitudinal direction. Further, a T-shaped groove 71 is formed on the left side of the C-shaped groove 69 on the right side in FIG. 6 in a state of extending in the longitudinal direction, and a concave portion 72 is formed on the lower side of the C-shaped groove 69 on the left side in the longitudinal direction. It is formed in an extended state. In addition, C-shaped grooves 73 and 73 opened outward are formed in the lower part of the upper cover member 61 at both left and right ends in a state extended in the longitudinal direction. In the figure, reference numerals 75 and 75 denote outward openings that open outward.

  On the other hand, as shown in FIG. 7, the lower cover member 63 includes a bottom wall 77 and side walls 79, 79 erected on both left and right ends of the bottom wall 77. On the inner side surfaces of the left and right side walls 79, 79, convex portions 81, 81 are projected in the entire region in a state of extending in the longitudinal direction, and these convex portions 81, 81 are formed in the C-shaped grooves 73, 73. It is engaged with the whole area of the outward opening portions 75 and 75 to constitute a so-called labyrinth structure.

  Further, as shown in FIG. 8, on both the left and right ends of the bottom wall 77 of the lower cover 63, the built-up portions 83 and 83 are provided in the entire region in a state of extending in the longitudinal direction. These built-up portions 83 and 83 urge the outward opening portions 75 and 75 of the C-shaped grooves 73 and 73 in the closing direction.

Further, as shown in FIGS. 6 to 8, a circuit board 91 is attached inside the upper cover member 61. A plurality of electrical / electronic components 93 are mounted on the circuit board 91. A through hole 95 is formed in the circuit board 91. The circuit board 91 is attached to the inner surface of the upper cover member 61 by screwing the attachment screw 98 through the through hole 95 and the nut 97 provided in the T-shaped groove 71 already described. It has been.
As shown in FIGS. 6 and 8, a heat radiating sheet 96 is provided on the inner surface of the upper cover member 61 and is in contact with a copper foil pattern (not shown) formed on the circuit board 91. The heat radiating sheet 96 is sandwiched between the circuit board 91 and the upper cover member 61 by fitting one end of the circuit board 91 into a recess 72 formed inside the upper cover member 61. . Then, heat is transferred in the order of the copper foil pattern, the heat dissipation sheet 96, and the motor cover 41 to dissipate heat generated by the electric / electronic components on the circuit board 91.

  Further, as shown in FIG. 5, holes 99 and 99 are formed in the upper and lower ends of the bearing support member 11, and female holes are provided in these holes 99 and 99, respectively. The motor cover main body 57 is screwed into the female threads of the holes 99 and 99 through the two fixing screws 101 and 101 through the left and right C-shaped grooves 69 and 69 of the upper cover member 61 of the motor cover main body 57. By doing so, it is attached to the bearing support member 11.

Further, as shown in FIG. 7, through-holes 103 are formed in the lower part of the motor cover cap 59 at both left and right ends. The motor cover cap 59 is attached to the motor cover main body 57 by screwing the fixing screws 105, 105 into the C-shaped grooves 73, 73 through the through holes 103, 103 by self-tapping. . At the same time, the lower cover 63 is fixed to the upper cover 61 by screwing the fixing screws 105, 105 of the motor cover cap 59 into the C-shaped grooves 73, 73.
The fixing screws 105 and 105 in the present embodiment are normal self-tapping screws, but in order to further enhance the chip scattering prevention effect, self-tapping screws whose surface is subjected to chip scattering prevention processing are used. It is also possible. For example, “CP grip (registered trademark)” manufactured by Nitto Seiko Co., Ltd. is available.

The operation will be described based on the above configuration.
First, the general operation as an actuator will be described.
When the drive motor 43 rotates in a proper forward / reverse direction, the ball screw shaft 13 rotates in the same direction via the Oldham coupling 47. The rotation of the ball screw shaft 13 causes the ball screw nut 21 and the slider 33 to move in an appropriate direction in the forward and backward directions. Thereby, the device mounted on the slider 33 performs a desired operation.

Next, assembly of the motor cover 41 will be described.
First, in the motor cover main body 57 of the motor cover 41, the two fixing screws 101, 101 are passed through the left and right C-shaped grooves 69, 69 of the upper cover member 61 and left and right holes 99, 99 of the bearing support member 11. The bearing support member 11 is fixed by being screwed into the female thread portion.
Further, the motor cover cap 59 has two fixing screws 105, 105 passing through the left and right through holes 103, 103 of the motor cover cap 59 and left and right C-shapes of the upper cover member 61 of the motor cover main body 57. The motor cover main body 57 is fixed by screwing into the grooves 73 and 73 by self-tapping.
At that time, the outward openings 75 and 75 of the C-shaped grooves 73 and 73 are urged in the closing direction by the left and right built-up portions 83 and 83 of the bottom wall 77 of the lower cover member 63 of the motor cover main body. The

As described above, according to the present embodiment, the following effects can be obtained.
First, it is possible to prevent chips from falling and scattering in the motor cover 41, and the chips 43 falling and scattering may adversely affect the motor 43, the circuit board 91, and various electric and electronic components mounted on the circuit board 91. It can be prevented from receiving. This is because the C-shaped grooves 73, 73 provided at the left and right ends of the upper cover member 61 of the motor cover main body 57 have the outward openings 75, 75 facing literally outward, and the lower cover member 63 is installed there. This is because the possibility that the chips generated in the C-shaped grooves 73 and 73 fall and scatter into the motor cover 41 is eliminated.
Further, the outward openings 75 and 75 are engaged with the convex portions 81 and 81 provided on the left and right side walls 79 and 79 of the lower cover member 63, so that they are generated in the C-shaped grooves 73 and 73. It is possible to prevent the chips from falling and scattering outside the motor cover 41 and preventing the surroundings from becoming dirty due to the dropping and scattering of the chips.
In particular, since the entire area of the outward opening portions 75 and 75 is covered with the convex portions 81 and 81, it is possible to prevent the chips from being scattered around even if a normal self-tapping screw is used.
Further, the left and right ends of the lower cover member 63 are provided with built-up portions 83 and 83 for urging the outward opening portions 75 and 75 of the left and right C-shaped concave portions 73 and 73 in the closing direction. A stronger fixed state can be obtained.
Further, if the fixing screws 105, 105 having the outer surface subjected to chip scattering prevention treatment are used, chip scattering can be further prevented.
Further, in the mounting structure of the circuit board 91, since the T-shaped groove 71 is provided in the upper cover member 61 of the motor cover 41 and the nut 97 is housed therein, the nut 97 is provided in accordance with the size of the circuit board 91. The position can be changed as appropriate, and the circuit board 91 of various sizes can be handled.
In addition, since the motor cover 41 is composed of two members, the workability of attaching the circuit board 91 and wiring processing with the motor 43 can be improved.

The present invention is not limited to the one embodiment.
First, in the case of the above-described embodiment, a slider type actuator is taken as an example, and an example in which the present invention is applied to the motor cover has been described. However, the present invention is not limited to this. For example, it can be similarly applied to a motor cover of a rod type actuator.
Further, the present invention is not limited to the motor cover of the actuator, and can be similarly applied to a motor cover of another type of equipment.
In the embodiment, the C-shaped grooves are formed on the left and right ends of the inverted U-shaped upper cover member constituting the motor cover body of the motor cover. C-shaped grooves may be formed at the left and right ends.
In the above embodiment, the motor cover main body has been described with an example in which the cross-sectional shape is composed of an upper cover member having an inverted U shape and a lower cover member on a substantially flat plate. The upper cover member and the lower cover member having a U-shaped cross section are also applicable to the motor cover body.
At this time, it is arbitrary whether the upper cover member on the flat plate or the lower cover member having a U-shaped cross section is formed in the C-shaped groove.
In the embodiment, the motor cover cap is fastened to the motor cover body with a fixing screw. However, the lower cover is fixed to the upper cover with the fixing screw, and the motor cover cap is fixed by another fixing method. You may attach to a motor cover main body.
In the embodiment, the opening of the C-shaped groove faces the outside of the motor cover body, but the C-shaped groove may face the inside of the motor cover body.
In addition, the illustrated configuration is merely an example.

  The present invention relates to a motor cover and an actuator. In particular, the present invention relates to a device that is designed so that chips do not fall and scatter in the motor cover when the motor cover is assembled with a self-tapping screw.

41 Motor Cover 43 Drive Motor 57 Motor Cover Body 59 Motor Cover Cap 61 Upper Cover Member (First Cover Member)
63 Lower cover member (second cover member)
73 C-shaped groove (tapped part)
75 outward opening (opening)
81 Convex part 83 Overlay part 91 Circuit board 93 Electronic component 103 Through-hole 105 Fixing screw (tap screw)

Claims (8)

It has a motor cover body,
The motor cover body includes a first cover member and a second cover member,
The first cover member and the second cover member are integrated via an engaging portion,
The engaging portion includes a substantially C-shaped groove and a convex portion that closes the opening of the substantially C-shaped groove,
The substantially C-shaped groove is formed in any one of the first cover member and the second cover member,
The convex portion is formed on either one of the first cover member and the second cover member,
The substantially C-shaped groove is provided with a tapped portion,
By screwing a tap screw into the tapped part,
One of said 1st cover member and said 2nd cover member is fixed to the other, The motor cover characterized by the above-mentioned. The motor cover according to claim 1,
By engaging the two sides of the first cover member and the two sides of the second cover member,
The motor cover body is formed in a cylindrical shape,
The substantially C-shaped groove is formed on two sides of either the first cover member or the second cover member,
2. The motor cover according to claim 1, wherein the convex portions are formed on the other two sides of the first cover member and the second cover member. The motor cover according to claim 2,
The substantially C-shaped groove is formed in the entire area of the two sides,
The motor cover according to claim 1, wherein the convex portion is formed over the entire area of the two sides. In the motor cover according to any one of claims 1 to 3,
The motor cover according to claim 1, wherein the opening of the substantially C-shaped groove is formed toward the outside of the motor cover main body. In the motor cover according to any one of claims 1 to 3,
An opening of the substantially C-shaped groove is formed toward the inside of the motor cover main body. In the motor cover according to any one of claims 1 to 5,
In the cover member in which the convex portion is formed,
A motor cover, characterized in that a built-up portion for biasing in a direction of narrowing the opening of the substantially C-shaped groove is provided. In the motor cover according to any one of claims 1 to 6,
A motor cover, wherein the motor cover body includes a circuit board.   An actuator comprising the motor cover according to any one of claims 1 to 7.

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