JPH09327167A - Motor actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a motor actuator which prevents dust particles from entering the bearing part of a stepping motor and in which a cover member can be removed simply by a method wherein a flange part which is installed integrally so as to be extended from the cover member is provided so as to cover a bearing, on the other side, which bears an output shaft. SOLUTION: A flange part 68 which is installed integrally so as to be extended from a cover member 6 is provided so as to cover a bearing, on the other side, which bears an output shaft. Thereby, the connecting terminal of a stepping motor 3 which constitutes a receptacle member in cooperation with a receptacle housing 5 can be protected. At the same time, the bearing, on the other side, of the stepping motor 3 is covered with the flange part 68 which is installed integrally at the cover member 6, and it is possible to effectively prevent dust particles from entering the bearing or to prevent an object from coming into contact with the bearing. Since the cover member 6 is freely detachable, the performance of the stepping motor 3 can be inspected easily when the cover member 6 is removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor actuator adapted to extract the rotational output of a stepping motor through a speed reducer.

[0002]

2. Description of the Related Art For example, a motor actuator used to adjust the positions of various dampers provided in a duct of an air conditioner for an automobile is known. In this conventional motor actuator, a stepping motor is externally attached to the outside of a gear case that incorporates a gear type speed reducer, and the rotation output of this stepping motor is input to the input side gear of the speed reducer that is incorporated in the gear case. To obtain a required low rotation output from the driven shaft.

According to the above structure, the heat dissipation of the stepping motor can be satisfactorily performed, and one of the pair of bearings provided in the motor case for the bearing of the output shaft of the stepping motor is exposed to the outside. However, the performance can be easily measured by attaching a pointer for position recognition to the end surface of the output shaft which is visible from this bearing.

[0004]

However, according to the above-mentioned conventional configuration in which the stepping motor is externally attached to the gear case in consideration of the heat radiation property against the heat generated by the stepping motor and the performance measurement, the following problems occur. Occurs. That is, since one end of the output shaft of the stepping motor enters the gear case and meshes with the input side gear of the reduction gear by a pinion or the like fixed to the output shaft, the bearing portion at one end of the output shaft of the stepping motor Is protected by the close connection between the gear case and the stepping motor, and foreign matter such as dust does not adhere thereto. But,
The bearing part at the other end of the output shaft of the stepping motor is exposed to the outside for performance measurement, so in addition to the problem that dust gets in and the friction at the bearing part increases,
When an object comes into contact with the bearing portion, oil in the bearing portion leaks out, causing various problems, and there is a problem that performance deterioration such as generation of abnormal noise or reduction in output torque occurs.

It is an object of the present invention, therefore, to provide an improved motor actuator which is able to overcome the above mentioned problems in the prior art.

[0006]

The features of the present invention for solving the above-mentioned problems include a gear case incorporating a speed reducer,
In order to connect one end of the output shaft rotatably supported by a pair of bearings to the input side of the speed reducer in the gear case, one bearing supporting the one end is protected by the gear case. A stepping motor externally attached to a gear case, wherein the stepping motor is attached to the gear case to receive a connection terminal fixed to the case of the stepping motor and connect to the connection terminal. A receptacle housing integrally formed with the gear case so as to form a receptacle portion of the connector, a cover member detachably attached to the receptacle housing to protect the connection terminal, and the output shaft. Extending integrally from the cover member so as to cover the other bearing Lies in that a flange portion which is.

According to this structure, by locking the cover member to the receptacle housing, the connection terminal of the stepping motor which is received in the receptacle housing and cooperates with the receptacle housing to form the receptacle member can be protected. At the same time, the other bearing of the stepping motor is covered by the flange portion provided integrally with the cover member, and it is possible to effectively prevent dust from entering the bearing and an object from coming into contact with the bearing. . Since the cover member is removable, the other bearing of the stepping motor is exposed by removing the cover member, and the performance of the stepping motor can be easily measured by using the output shaft visible from this bearing.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an example of an embodiment of a motor actuator according to the present invention, and FIG. 2 is an exploded perspective view of the motor actuator shown in FIG. Referring to FIGS. 1 and 2, the motor actuator 1 includes a gear case 2 having a reduction gear built therein and a stepping motor 3 externally attached to the gear case 2.

The gear case 2 is composed of an upper case 21 and a lower case 22. The gear type speed reducer 4 built in the gear case 2 includes the stepped gears 44 to 46 and the output gear 47, which are rotatably supported by the support pins 41 to 43 planted in the lower case 22, respectively. It is configured as a known gear train mechanism. Output gear 4
Reference numeral 7 designates a corresponding support hole 21A formed in the upper case 21 at each end of a cylindrical shaft 47A integrally formed with the lower case 2.
It is mounted on the gear case 2 by being supported by the corresponding support holes (not shown) formed in 2. A plurality of ridges 47B are formed on the inner peripheral wall of the cylinder shaft 47A of the output gear 47 along the axial direction. The rotation output of the output gear 47 can be taken out by being fitted inside. The upper case 21 and the lower case 22 are the through holes 21 provided in the upper case 21.
The screws B1 to 21D are passed through the screws S1 to S3 and screwed into the corresponding screw holes 22B, 22C and 22D of the lower case 22 to be fixed to each other.

A plurality of concentric annular grooves 21F to 21H are formed on the motor mounting surface 21E of the upper case 21, and a through hole 21I for receiving the output shaft 34 of the stepping motor 3 is formed in the center thereof. Has been formed.

The stepping motor 3 is housed in a cylindrical casing 31 as a whole.
The rotating shaft 34 is rotatably supported by a pair of bearings 32 and 33 provided on the outer side surface 31A and the inner side surface 31B. One end 34A of the rotary shaft 34 largely projects from the inner side surface 31B of the casing 31, and the small gear 35 is fixed to the one end 34A. Stepping motor 3
A mounting flange 36 is fixed to the inner side surface 31B of the device by an appropriate means, and the stepping motor 3 is screwed to the upper case 21 by this flange 36 and fixed to the gear case 2.

In the state where the stepping motor 3 is fixed to the gear case 2, the bearing 33 fits snugly into the through hole 21I.
The small gear 35, which is fitted into the gear case 2 and fixed to the one end portion 34 </ b> A of the rotary shaft 34, has a stepped gear 44 in the gear case 2.
Has a configuration in which it meshes with the larger gear portion 44A. As a result, when the rotating shaft 34 of the stepping motor 3 rotates, this rotation is decelerated in the speed reducer 4, and the low speed rotation output can be taken out from the cylinder shaft 47A of the output gear 47 that functions as a low speed driven shaft.

As shown in FIG. 3, an outer peripheral portion 31C of the casing 31 of the stepping motor 3 is provided with a terminal portion 37 for connecting an internal exciting coil (not shown) to an external circuit. The terminal portion 37 includes a plurality of connection terminals 37A to 37 which are electrically connected to the exciting coil internally.
This is a known structure formed by resin-molding F.

Connection terminals 37A-3A extending parallel to each other
7F is a receptacle housing 5 formed integrally with the upper case 21 by screwing the stepping motor 3 onto the motor mounting surface 21E of the gear case 2.
Accepted within. In the present embodiment, as can be seen from FIG. 2, the terminal portion 37 is fitted into the step portions 51 and 52 formed in the receptacle housing 5, and the connection terminal 37
A to 37F are housed in the receptacle housing 5 in a predetermined posture. As a result, a receptacle portion is constituted by the receptacle housing 5 and the connection terminals 37A to 37F, and the connection terminal 37A is connected to an external connector (not shown) inserted through the opening 53 of the receptacle housing 5.
~ 37F can be electrically connected.

Reference numeral 6 denotes a cover member which is detachably attached to the receptacle housing 5 in order to protect the connection terminals 37A to 37F housed in the receptacle housing 5. The cover member 6 is a synthetic resin molded product formed in a substantially U shape as a whole, and includes a plate-shaped portion 61 that covers the upper opening of the receptacle housing 5,
The plate-shaped portion 61 is composed of a pair of leg portions 62, 63 extending integrally from both ends in a direction perpendicular to the plate-shaped portion 61. Leg 6
Locking step portions 66, 6 are provided on the respective tip end portions 64, 65 of 2, 63.
7 are formed.

Referring to FIG. 4, on both sides of the receptacle housing 5, there are frame bodies 54 and 55, and a tip portion 64,
Spaces 56 and 57 that can pass 65 respectively
Are formed. Each tip 64, 6 of the legs 62, 63
When the 5 is passed through the spaces 56 and 57, respectively, the legs 62,
63 is recessed inward, and the locking step portions 66 and 67 are in the space 5
When it escapes from 6, 57, it spreads outward and the locking step 6
6, 67 are locked to the lower edges of the frames 54, 55. As a result, the cover member 6 is hooked on the receptacle housing 5 in the state shown in FIG. 1, but the locking step portions 66 and 67 and the frame body 54 are formed by merely squeezing the tip portions 64 and 65 inward.
The locked state with the lower edge of 55 can be released, and the cover member 6 can be easily removed from the receptacle housing 5 if desired.

The cover member 6 is attached to the receptacle housing 5
In order to prevent dust from adhering to the bearing 32 of the stepping motor 3 and prevent an object from coming into contact with the bearing 32 in the state of being locked to the bearing 32 of the stepping motor 3 in the state of FIG. The flange portion 68 is integrally extended toward. In the present embodiment, the flange portion 68
Is formed as a tongue-shaped thin plate, and its tip portion 68A covers the bearing 32 to prevent dust from entering the bearing 32, and the bearing 32 may be touched or contacted by objects in the vicinity. Can be effectively prevented.

Since the motor actuator 1 is constructed as described above, in normal use, as shown in FIG. 1, the bearing 32 is covered by the tip portion 68A of the flange portion 68, and the bearing 32 is dusted. The cover member 6 can be easily removed from the receptacle housing 5 in addition to being protected from contact with an object. When the cover member 6 is removed from the receptacle housing 5, the bearing 32 is exposed, and the required performance measurement can be performed using the end face of the rotary shaft 34 visible from the bearing 32 in the same manner as in the conventional case. Since the flange portion 68 is simply provided integrally with the cover member 6 so as to be easily provided, the cost can be reduced and the remarkable effect can be expected as described above.

[0020]

According to the present invention, the flange portion is integrally provided on the cover member to prevent dust from entering the bearing portion of the stepping motor externally attached to the gear case, and to contact an object with the bearing portion. Thus, the bearing oil can be prevented from flowing out with a simple structure and at low cost. Since this cover member can be easily removed from the receptacle housing, the performance of the stepping motor can be easily measured at any time.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a motor actuator according to the present invention.

FIG. 2 is an exploded perspective view of the motor actuator shown in FIG.

FIG. 3 is a perspective view of the stepping motor shown in FIG.

FIG. 4 is a plan view of the gear case shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor actuator 2 Gear case 3 Stepping motor 4 Reduction gear 5 Receptacle housing 6 Cover member 32, 33 Bearing 34 Rotating shaft 37 Terminal part 37A-37F Connection terminal 66, 67 Locking step part 68 Flange part

Claims (1)

[Claims] 1. A gear case containing a speed reducer, and one end of an output shaft rotatably supported by a pair of bearings is supported in the gear case to connect the one end to the input side of the speed reducer. A stepping motor externally attached to the gear case so that one of the bearings is protected by the gear case, the stepping motor being attached to the gear case allows the stepping motor to be attached to the case of the stepping motor. A receptacle housing integrally formed with the gear case so as to form a receptacle portion of a connector that receives a fixed connection terminal and should be connected to the connection terminal; and a detachable housing for protecting the connection terminal. A cover member to be latched, and a bearing for the output shaft And a flange portion integrally extending from the cover member so as to cover one bearing.