JP2012111421A - Actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an actuator capable of reducing an impulsive hitting sound in a thrust direction of a rotary shaft without enhancing accuracy in a dimension error of parts and assembly.SOLUTION: The actuator 1 includes a case 10, a motor 20 arranged in the case 10 and provided with a worm 26 fixed to the rotary shaft 21, and gears 30 engaged with the worm 26. In the case 10, a thrust receiving part 13 restricting thrust movement of the rotary shaft 21 is arranged on a front end side of the rotary shaft 21 of the motor 20. The case 10 and the motor 20 are respectively provided with fixing means adjusting the position in the axial direction of the rotary shaft 21 and fixing the motor 20. The fixing means comprises a motor-side fixing means arranged on the motor 20 and formed into a shape of a linear projection or of a groove formed in the axial direction of the rotary shaft 21, and a case-side fixing means engaged with the motor-side fixing means, arranged in the case 10, and formed into a shape of a groove or a linear projection formed in the axial direction of the rotary shaft 21.

Description

  The present invention relates to an actuator, and more particularly to an actuator that controls opening and closing of each door mounted in an automotive air conditioner.

  For example, Patent Document 1 discloses an actuator in which a motor 102 is placed in a motor housing recess of a lower case 101 and a worm 104 is fixed to a tip (one end) 103 of a rotating shaft as shown in FIG. Has been. The worm 104 is meshed with the first reduction gear 105, and the second reduction gear 106 meshed with the first reduction gear 105 is meshed with the output gear (output shaft) 107. A thrust receiving portion 108 that restricts movement of the rotating shaft in the axial direction is provided on the lower case 101 on the tip 103 side of the rotating shaft, and a gap is provided between the tip 103 of the rotating shaft and the thrust receiving portion 108. Is provided.

  This gap is, for example, when the dimensional tolerance in the longitudinal direction of the rotating shaft, the dimensional tolerance of the position of the thrust receiving portion in the lower case, or the dimensional tolerance of the assembly of the lower case and the motor is maximized. The rotation shaft is set so as not to be pressed by the thrust receiving portion. That is, the tip of the rotating shaft is set so as to have a gap with the thrust receiving portion even when the dimensional tolerance of the above-described parts or assembly is maximum. If it does in this way, the tip of a rotating shaft will not be pressed by a thrust receiving part, and the fall of the endurance of the thrust plate in the motor which receives the other end of a rotating shaft at the time of motor rotation can be reduced.

JP 2005-335519 A

However, depending on the dimensional tolerances of the parts and assemblies described above, the gap becomes large, and when the worm starts to rotate in the direction protruding from the motor, the rotating shaft thrusts and the tip of the rotating shaft collides with the thrust receiving part. Will produce a loud sound. Also, if the load on the output shaft disappears while the rotating shaft is rotating in the direction protruding from the motor, or if the rotating shaft rotates in the reverse direction, the rotating shaft is thrust and the other end of the rotating shaft is moved into the motor. A large hitting sound is also generated by collision with the thrust plate.
Therefore, if the accuracy of the dimensional tolerance of the above-mentioned parts and assembly is increased and the clearance between the tip of the rotating shaft and the thrust receiving part is set small, the hitting sound can be reduced, but the manufacturing cost of the parts becomes high.

  Therefore, the present invention provides an actuator that can reduce the hitting sound without increasing the accuracy of dimensional tolerances of parts and assemblies.

The actuator of claim 1 of the present invention, which is made to achieve the above object, comprises:
An actuator comprising a case, a motor provided in the case and having a worm fixed to a rotating shaft, and a gear meshing with the worm,
In the case, a thrust receiving portion for restricting thrust movement of the rotary shaft is disposed on the tip side of the rotary shaft of the motor,
Each of the case and the motor is provided with a fixing means capable of fixing the motor by adjusting the position in the axial direction of the rotating shaft,
The fixing means includes a motor-side fixing means that is provided on the motor and has a ridge shape or a groove shape formed in the axial direction of the rotating shaft, and is fitted into the motor-side fixing means. And a case side fixing means having a groove shape or a ridge shape formed in the axial direction of the rotating shaft.

The actuator according to claim 2 of the present invention is the actuator according to claim 1,
The motor side fixing means is provided in a motor case of the motor.

  According to the present invention, the case and the motor are each provided with fixing means that can fix the motor by adjusting the position of the rotating shaft in the axial direction. Thrust movement can be suppressed and the hitting sound can be reduced.

It is a top view of the finished product of the actuator concerning one embodiment of the present invention. (A) is a top view except the upper case of the actuator which concerns on one Embodiment of this invention, (b) is sectional drawing of the cutting line AA of (a). (A) is a top view of the lower case which concerns on one Embodiment of this invention, (b) is sectional drawing of the cutting line BB of (a). (A) is a front view of the motor which concerns on one Embodiment of this invention, (b) is a side view of (a). The 1st modification of the motor holding part of the actuator which concerns on one Embodiment of this invention, and the groove shape of the lower case which fixes the motor holding part are shown. The 2nd modification of the motor holding part of the actuator which concerns on one Embodiment of this invention, and the groove shape of the lower case which fixes the motor holding part are shown. (A) is a front view of the modification of the motor which concerns on one Embodiment of this invention, (b) is a side view of (a). (A) is related with one Embodiment of this invention, and is a top view except the upper case of the actuator in the state incorporating the motor which has a worm | warm of a modification, (b) is the cutting line C of (a). It is sectional drawing of -C. It is a top view except the upper case of the conventional actuator.

  Hereinafter, an actuator 1 according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of a finished product of an actuator 1 according to an embodiment of the present invention. FIG. 2A is a plan view of the actuator according to the embodiment of the present invention excluding the upper case, and FIG. 2B is a cross-sectional view taken along line AA in FIG. . FIG. 3A is a plan view of a lower case according to an embodiment of the present invention, and FIG. 3B is a cross-sectional view taken along line BB in FIG. FIG. 4A is a front view of a motor according to an embodiment of the present invention, and FIG. 4B is a side view of FIG.
As shown in FIG. 2, the actuator 1 of this embodiment includes a case 10, a motor 20, and a gear 30.

  The case 10 is for housing the motor 20 and the gear 30. As a specific configuration example of the case 10, an accommodation recess formed between the upper case 11 and the lower case 12 is assembled so that the openings of the accommodation recesses included in the upper case 11 and the lower case 12 of the resin material face each other. The motor 20 and the gear 30 are accommodated in the housing.

  A thrust receiving portion 13 is provided in the lower case 12 so as to face the tip 22 of the rotating shaft of the motor 20. The thrust receiving portion 13 is a receiving plate having a flat surface and is formed integrally with the lower case 12, and restricts the thrust movement of the rotating shaft 21 when the rotating shaft 21 moves in the protruding direction from the motor 20.

  The motor 20 is composed of a motor with a brush, and is provided with a bottomed cylindrical motor case 24, a motor case lid 25 that closes the opening end of the motor case 24, and the motor case 24 and the motor case lid 25, respectively. It has a bearing, a rotating shaft 21 rotatably supported by the bearing, and a rotor (not shown) that rotates integrally with the rotating shaft 21. The motor 20 may be a brushless motor.

The rotating shaft 21 protrudes from the bottom 24A of the motor case, and a worm 26 is fixed to the protruding rotating shaft 21.
In the present embodiment, as shown in FIG. 2, the tip (one end) 22 of the rotating shaft protrudes from the worm 26. The base end (the other end) of the rotating shaft 21 is in contact with and supported by a thrust plate (not shown) provided in the motor case lid 25.

  Since the motor 20 usually has variations in the dimensional accuracy and assembly dimensional accuracy of each component, there is a clearance (play amount in the thrust direction) in the axial direction (arrow X direction) between the bearing of the motor case 24 and the rotor. The rotary shaft 21 is provided and can be thrust-moved by a play amount in a direction protruding from the motor case 24.

  As shown in FIG. 4, the motor 20 is attached to the lower case 12 via a motor holding portion 27 having a substantially L-shaped cross section. The holding portion 27 is formed of a resin material or a metal material. A through hole (not shown) through which the rotating shaft 21 of the motor 20 can pass is provided in the upright portion 27A of the motor holding portion 27. It is fixed to the upright part 27A of this with screws 27A1.

  The lower case 12 and the motor 20 are each provided with a fixing means that can fix the motor 20 by adjusting the position of the rotary shaft 21 in the axial direction (arrow X direction).

  The fixing means is provided in the lower case 12 and is fitted to the motor-side fixing means and the motor-side fixing means, which is provided on the motor 20 and has a ridge shape 23 formed in the axial direction of the rotating shaft 21. And a case-side fixing means having a groove shape 14 formed in the axial direction of the rotary shaft 21.

  In the present embodiment, two ridge shapes 23 are provided on the bottom surface of the base portion 27 </ b> B of the motor holding portion 27 along the rotation axis direction of the motor 20, and the groove shape 14 fitted to the ridge shape 23 is: Two are provided in the lower case 12 side by side in the axial direction of the rotating shaft. The groove shape 14 is formed in a direction substantially perpendicular to the plate surface of the thrust receiving portion 13. When the motor 20 is fixed to the lower case 12, the axial direction of the rotary shaft 21 is substantially orthogonal to the plate surface of the thrust receiving portion 13. become.

  The width H1 of the ridge shape 23 is formed substantially the same as the width H2 of the groove shape 14 in the lower case 12, and when the ridge shape 23 of the motor 20 is fitted to the groove shape 14 in the lower case 12, The motor 20 can be fixed (fixed) to the lower case 12.

In the above description, the motor side fixing means has the ridge shape 23 and the case side fixing means has the groove shape 14, but the motor side fixing means has the groove shape and the case side fixing means has the ridge shape. Also good.
In the above description, two ridge shapes 23 and two groove shapes 14 are provided, but one or three or more ridge shapes 23 are provided, and the groove shapes that fit into the ridge shapes 23 are provided. One or three or more 14 may be provided in the lower case 12.

  Further, in the above description, the plate surface of the thrust receiving portion is formed in a direction substantially orthogonal to the axial direction of the rotating shaft, but the rotating shaft only needs to abut against the thrust receiving portion to limit the movement of the rotating shaft, The plate surface of the thrust receiving portion may be provided with an inclination with respect to the axial direction of the rotating shaft, and the thrust receiving portion may have a protruding shape at the portion where the tip of the rotating shaft contacts. .

  The gear 30 includes a plurality of gears, and includes a first gear 31, a second gear 32, and an output gear (output shaft) 33. The gears 30 are rotatably supported by upper and lower cases, respectively. The first gear 31 is meshed with the worm 26 of the rotating shaft 21 of the motor 20. The second gear 32 is meshed with the first gear 31. The output shaft 33 is meshed with the second gear 32. The output shaft 33 is engaged with each door attached in the automobile air conditioner, and when the rotational force of the rotary shaft 21 of the motor 20 is transmitted, the opening / closing of each door can be controlled.

Next, a method for assembling the actuator 1 will be described.
A motor holding unit 27 is attached to the motor 20. The motor 20 is arranged in the lower case 12 so that the tip 22 of the rotating shaft of the motor 20 faces the thrust receiving portion 13 in the lower case 12.

  In the present embodiment, the lower case 12 and the motor 20 are each provided with a fixing means that can fix the motor 20 by adjusting the position of the rotating shaft 21 in the axial direction. Motor-side fixing means having a ridge shape 23 formed in the axial direction of 21 and a groove that fits in the motor-side fixing means and is provided in the lower case 12 and formed in the axial direction of the rotary shaft 21 It is composed of case-side fixing means having a shape 14.

  When the motor 20 is assembled to the lower case 12, the position of the motor 20 is adjusted in the axial direction so that the tip 22 of the rotating shaft and the thrust receiving portion 13 are close to each other. It is press-fitted into and fitted into the groove shape 14 of the lower case 12 along the opening direction (arrow Y direction) of the housing recess.

  More specifically, when assembling the motor 20 to the lower case 12, for example, a not-shown thrust gauge for gap adjustment is sandwiched between the tip 22 of the rotating shaft and the thrust receiving portion 13, and the tip 22 of the rotating shaft is attached. After fixing the motor 20 to the lower case 12 while being pressed against the thrust gauge, the thrust gauge is removed, and the ridge shape 23 of the motor 20 is set with the tip 22 of the rotating shaft and the thrust receiving portion 13 set to a predetermined gap. The groove shape 14 of the lower case 12 is fitted.

  Thereafter, the first gear 31 is provided in the lower case 12 so as to mesh with the worm 26 of the rotary shaft 21, the second gear 32 and the output shaft 33 are then provided in the lower case 12, and the upper case 11 is provided in the lower case 12. Cover the case 12.

  As described above, the actuator 1 according to the embodiment is an actuator 1 including the case 10, the motor 20 provided in the case 10 and the worm 26 fixed to the rotating shaft 21, and the gear 30 that meshes with the worm 26. is there. In this case 10, a thrust receiving portion 13 that restricts the thrust movement of the rotating shaft 21 is disposed on the tip 22 side of the rotating shaft of the motor 20. The motor 20 is connected to the rotating shaft 21 in the case 10 and the motor 20, respectively. There is provided a fixing means capable of adjusting and fixing the position in the axial direction. This fixing means is provided in the motor 20 and is fitted in the motor side fixing means and the motor side fixing means which is formed in the shape of a ridge or groove formed in the axial direction of the rotating shaft 21 and is fitted in the case 10. It comprises case-side fixing means having a groove shape or a ridge shape provided in the axial direction of the rotating shaft 21.

  The actuator of this example configured in this way can solve (reduce) the hitting sound generated due to the play amount in the thrust direction of the rotating shaft of the motor and the dimensional tolerances of parts and assembly at once.

In other words, in this example, the case and the motor are each provided with a fixing means that can fix the motor by adjusting the position of the rotating shaft in the axial direction, so that the tip of the rotating shaft comes close to the thrust receiving portion (gap (Slightly), the thrust movement distance of the rotating shaft can be set small regardless of the play amount in the thrust direction of the rotating shaft and the dimensional tolerance of parts and assembly.
For this reason, when the rotating shaft thrust moves by driving the actuator, the rotating shaft contacts the thrust receiving portion or the thrust plate before the moving speed increases. It is possible to reduce the hitting sound that the base end of the shaft collides with the thrust plate.

  Next, a first modification of the motor holding unit will be described. FIG. 5 shows a first modification of the motor holding portion of the actuator according to one embodiment of the present invention and the groove shape of the lower case that fixes the motor holding portion.

  The motor holding portion 28 in FIG. 5 is formed by pressing an iron plate. The motor holding portion 28 is curved as it goes downward, with a flat portion 28A in contact with the outer peripheral top surface of the motor case 24, a side wall 28B in contact with the outer peripheral surface of the motor case 24 following the flat portion 28A, and the lower portion. It has a U-shape 28 </ b> C and a ridge shape 28 </ b> D in which the tip of the constricted portion projects in a direction perpendicular to the axial direction of the motor 20. The lower case 12 is provided with two locking recesses (groove shapes) 15 for locking the protrusions 28D in the axial direction, and the openings 15A of the locking recesses (groove shapes) are arranged to face each other.

  When assembling the motor 20 into the lower case 12, the motor holding portion 28 holds the motor 20 and adjusts the position of the motor 20 in the axial direction of the rotating shaft 21 while pushing both sides of the lower portion of the side wall 28B to form a ridge shape. 28D is locked (fixed) to the groove-shaped opening 15A of the lower case 12. Even if it is such a shape, while having the same effect as the above-mentioned embodiment, screwing becomes unnecessary and there are few parts, cost reduction and working time can be shortened.

  A second modification of the motor holding part will be described. FIG. 6 shows a second modification of the motor holding portion of the actuator according to the embodiment of the present invention and the groove shape of the lower case that fixes the motor holding portion.

The motor holding portion 29 of the second modification has a substantially L-shaped cross section, and the base portion 27 </ b> B of the motor holding portion 29 is provided with a ridge shape 29 </ b> A that projects in a direction orthogonal to the axial direction of the motor 20. .
The lower case 12 is provided with two locking recesses (groove shapes) 15 for locking the ridge shape 29A in the axial direction, and the openings 15A of the locking recesses (groove shapes) are arranged to face each other. When the motor 20 is incorporated in the lower case 12, the motor 20 is fixed by adjusting the position of the rotary shaft 21 in the axial direction while sliding the protrusion shape 29 </ b> A of the motor holding portion 29 into the groove shape 15. Even if it is such a shape, it has the same effect as the above-mentioned embodiment.

Fig.7 (a) is a front view of the modification of the motor which concerns on one Embodiment of this invention, FIG.7 (b) is a side view of (a).
In the above description, the motor 20 is provided with a motor holding portion. However, as shown in FIG. 7, the protrusion shape 23A is integrally provided on the outer peripheral surface of the motor case 24, and the motor 20 is directly connected to the lower case. 12 may be fixed.
With this configuration, the same effects as those of the above-described embodiment are obtained, and the motor holding portion and screwing are not required, and the number of parts is reduced, so that cost reduction and work time can be reduced.

  FIG. 8A is a plan view of an actuator according to an embodiment of the present invention, excluding an upper case of an actuator in which a motor having a modified worm is incorporated, and FIG. It is sectional drawing of cutting line CC of no. In FIG. 2, the tip 22 of the rotating shaft has a shape protruding from the worm 26. However, as shown in FIG. 8, the rotating shaft 21 may have a shape covered with the worm 26. In the present invention, the tip 22 of the rotating shaft means a shape in which the rotating shaft 21 protrudes from the worm 26 or a shape in which the rotating shaft 21 is covered with the worm 26.

  Note that the gap between the tip of the rotating shaft and the thrust receiving portion may be set as small as possible while the other end of the rotating shaft is in contact with the thrust plate. This gap is extremely small compared to the amount of play in the thrust direction of the rotating shaft of the motor. If comprised in this way, the thrust movement of a rotating shaft will hardly exist and a striking sound can be reduced significantly.

  In addition, when fixing the motor to the lower case, the motor's ridge shape is press-fitted and fitted into the groove shape of the lower case along the opening direction (arrow Y direction) of the housing recess of the lower case. Can be fitted into the lower case without moving in the axial direction (arrow X direction) of the rotary shaft, and it is not necessary to provide a large gap between the motor case lid and the inner surface of the lower case, thereby reducing the size of the case.

DESCRIPTION OF SYMBOLS 1 Actuator 10 Case 11 Upper case 12 Lower case 13 Thrust receiving part 14 Groove shape 15 Locking recessed part (groove shape)
15A Opening of a locking recess (groove shape) 20 Motor 21 Rotating shaft 22 Rotating shaft tip 22A Worm tip 23 Projection shape 23A Projection shape 24 Motor case 24A Motor case bottom 25 Motor case lid 26 Warm 27 Motor holding part 27A Upright part 27A1 Screw 27B Base part 28 Motor holding part 28A Flat part 28B Side wall 28C U-shaped 28D Projection shape 29 Motor holding part 29A Projection shape 30 Gear 31 First gear 32 Second gear 33 Output gear (Output shaft) )

Claims (2)

An actuator comprising a case, a motor provided in the case and having a worm fixed to a rotating shaft, and a gear meshing with the worm,
In the case, a thrust receiving portion for restricting thrust movement of the rotary shaft is disposed on the tip side of the rotary shaft of the motor,
Each of the case and the motor is provided with a fixing means capable of fixing the motor by adjusting the position in the axial direction of the rotating shaft,
The fixing means includes a motor-side fixing means that is provided on the motor and has a ridge shape or a groove shape formed in the axial direction of the rotating shaft, and is fitted into the motor-side fixing means. And a case-side fixing means having a groove shape or a ridge shape formed in the axial direction of the rotating shaft. The actuator according to claim 1, wherein the motor side fixing means is provided in a motor case of the motor.

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