JPH0717147B2 - Electric actuator for automotive air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an improvement in an electric actuator of an air conditioner for a vehicle.

(Prior Art) Generally, in an air conditioner for an automobile, an intake door that switches between air inside the vehicle and air outside the vehicle is introduced, an air mix door that controls a blowout temperature by changing a ratio of cold air and warm air,
Various doors such as a ventilation door for changing the ventilation direction when the air inside the vehicle is blown out are provided.

Conventionally, these various doors have been operated mainly by a negative pressure actuator that performs film movement by utilizing negative pressure of an engine.

However, recent vehicles have come to use a turbocharger for increasing the output torque, and such a turbo vehicle uses exhaust gas to rotate a turbine as is well known, so that negative pressure is unnecessary. However, the negative pressure actuator described above is replaced with an electric actuator depending on the vehicle type.

Here, the electric actuator is, as shown in FIGS. 4 and 5, a reduction mechanism 2 composed of a motor M, a worm gear, a worm wheel, and the like in upper and lower casings 1a and 1b, and an output shaft fixed to a pinion gear 3 of this reduction mechanism 2. 4 and the like, the rotation of the output shaft 4 is transmitted to a rotary link 5 fixed to the output shaft 4, and various doors (not shown) are opened and closed via a control cable 6 connected to the rotary link 5. I am trying.

The motor M of this electric actuator 20 is fixed inside the casing by a motor holder 9. A motor terminal 13 is formed on the motor M, and a wiring circuit for motor control (not shown) is connected to the motor terminal 13. This wiring circuit is wired on the back surface of the substrate 10 by plating or the like, for example, as shown in Japanese Utility Model Laid-Open No. 58-116,407. This wiring circuit is connected to the coupler 11 and the brush 13 installed on the front surface of the substrate 10.

The coupler 11 serves as a connection port with an external power source and other electric circuits. Further, the brush 13 makes appropriate contact with the wiring circuit formed on the back surface of the pinion gear 3 to stop, continue, or reverse the energization of the motor M according to the rotational position of the gear 3. By doing so, the energization of the motor M is controlled, and as a result, the output shaft 4 is rotated by a predetermined angle. The reference numeral “12” in FIG. 4 indicates a bearing for holding the output shaft 4.

(Problems to be Solved by the Invention) However, in such a conventional motor actuator 20, the substrate 10 and the coupler 11 are arranged in the upper and lower casings 1a and 1b.
However, the increase in manufacturing cost has been a problem. The board 10 and the coupler 11 are relatively expensive parts and account for about 20% of the total cost.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric actuator for an air conditioner for an automobile, which is easy to manufacture and inexpensive, while reducing the number of parts.

[Structure of the Invention] (Means for Solving Problems) In order to achieve the above object, the present invention provides a motor that rotates by energization, various gears that transmit the rotational force of the motor to an output shaft, A wiring circuit arranged to control energization of the motor according to the rotational position of the gear, a coupler connected to the wiring circuit and forming a connection port with an external circuit, the motor, various gears and wiring In an electric actuator of an automobile air conditioner having a casing made of synthetic resin for housing a circuit, the wiring circuit is constituted by a plurality of good conducting rod members embedded by insert molding in the casing, It is characterized in that the end portion of the good conducting rod is projected in the coupler cover integrally formed with the casing to form the coupler.

(Operation) In such an electric actuator according to the present invention, a wiring circuit for controlling energization of the motor is integrally formed by insert-molding a plurality of good-conductivity rods in a resin casing. Therefore, the substrate used conventionally is unnecessary. Further, since the end portion of the good conducting rod material thus embedded in the casing also serves as the coupler, the coupler which has been conventionally required as a separate component is not required. Furthermore, since it is not necessary to mount such a board or coupler as a separate component, the number of soldering points is significantly reduced, which also contributes to a reduction in manufacturing cost.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

FIG. 1 is an exploded perspective view of an electric actuator showing an embodiment of the present invention, and FIG. 2 is an assembled state II- shown in FIG.
A sectional view taken along the line II, and Fig. 3 shows the first assembled state in the same manner.
FIG. 3 is a cross-sectional view taken along the line III-III shown in the drawing, in which members common to those shown in FIG. 4 are designated by the same reference numerals.

The electric actuator 30 shown in FIG. 1 is for rotatively driving various air distribution doors mounted in an automobile air conditioner, and has motors M in the upper and lower casings 31a and 31b.
It has a reduction gear mechanism 2 including a worm gear and a worm wheel, and an output shaft 4 fixed to a pinion gear 3 of the reduction gear mechanism 2. The output shaft 4 is rotatably held by a bearing 12 formed in the lower casing 31b,
The rotational force of the output shaft 4 is transmitted to the rotary link 5, and various ventilation doors (not shown) are controlled to open and close via a control cable 6 connected to the rotary link 5.

The upper and lower casings 31a and 31b, which accommodate the motor M and the speed reduction mechanism 2 including various gears, are integrally molded of synthetic resin or the like. Particularly, in the lower casing 31b, the motor holding body 9 for fixing the motor M is formed by integral molding, and a plurality of rods 32a, 32b are embedded by insert molding. The rods 32a and 32b are made of a material of good electrical conductivity such as copper, and constitute a wiring circuit 33 for controlling the energization of the motor M.

A part of the rod member 32 is connected to the terminal 13 of the motor M, and the other part is on the back surface of the pinion gear 3 and is in the lower casing 31.
The surface of the bar is exposed flush with the surface of b, and as shown in FIG. 3, the brush 34 adhered to the back surface of the pinion gear 3
Are in sliding contact with the surface of the bar member 32. With the rotation of the pinion gear 3, the brush 34 does not come into sliding contact with the surface of the bar member 32, so that the electromotive force to the motor M is continued, stopped, or reversed. It is possible to let them do it. Therefore, the energization of the motor M is controlled, and as a result, the output shaft 4
Can be rotated by a predetermined angle.

The end portion 35 of each rod 32 is made to uniformly project from the inside of the coupler cover 36b integrally formed with the lower casing 31b, and the coupler cover 36a integrally formed with the upper casing 31a is assembled. In the attached state, the coupler 37 is configured as shown in FIG.

In such an electric actuator 30, a wiring circuit 33 for integrally controlling the electromotive force to the motor M is integrally formed by insert-molding a plurality of good-conductivity rods 32 in the lower casing 31b made of resin. Therefore, the conventionally used substrate becomes unnecessary. Further, since the end portion 35 of the good-conductivity rod material 32 thus embedded also serves as the coupler 37, the coupler conventionally required as a separate component is also unnecessary. Further, since it is not necessary to mount the board or the coupler as a separate component in this manner, the number of soldering points is significantly reduced, which also contributes to a reduction in manufacturing cost.

[Effects of the Invention] As described above, according to the present invention, it is not necessary to mount a board and a coupler, which are conventionally required, as separate components, which contributes to a reduction in the number of components and a reduction in the number of soldering steps. The excellent effect of contributing to a large reduction in the manufacturing cost of this electric actuator is exhibited.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an electric actuator showing an embodiment of the present invention, and FIG. 2 is an assembled state II- shown in FIG.
A sectional view taken along the line II, and Fig. 3 shows the first assembled state in the same manner.
FIG. 4 is a sectional view taken along the line III-III in the figure, and FIG. 4 is an exploded perspective view of a conventional electric actuator. 2 ... Reduction mechanism, 30 ... Electric actuator, 31a ... Upper casing, 31b ... Lower casing, 32 ... Rod, 33 ... Wiring circuit, 35 ... Ends, 36a, 36b ... Coupler cover, M ... Motor.

Claims (1)

[Claims] 1. A motor (M) that rotates when energized, and various gears (2) that transmit the rotational force of this motor to an output shaft,
A wiring circuit (33) arranged to control energization to the motor according to the rotational position of the gear, and a coupler (37) connected to the wiring circuit and forming a connection port with an external circuit.
And a casing (31a, 31b) made of synthetic resin for housing the motor (M), various gears (2) and a wiring circuit (33)
In the electric actuator of the air conditioner for a vehicle, including the wiring circuit (33), the casing (31
b) is composed of a plurality of good conductive rods (32) embedded by insert molding.
An air conditioner for an automobile, characterized in that the coupler (37) is configured by projecting the end portion of 2) inside the coupler cover (36a, 36b) integrally formed with the casing (31a, 31b). Electric actuator.