JP3192865B2 - Electric actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric actuator for operating a door such as a mix door of an air conditioner for an automobile.

[0002]

2. Description of the Related Art Recent automobiles are equipped with an air conditioner called a so-called fully automatic air conditioner which automatically air-conditions a vehicle interior to a temperature set by an occupant even when the temperature of the outside air changes.

In such an air conditioner for an automobile, the air conditioner is based on various signals from various sensors for inputting temperature information of various parts of the vehicle and various setting switches for inputting occupant requests for air conditioning. The control device that controls the entire system automatically sets the air outlet temperature, air volume, air outlet mode, etc.
It is supposed to be maintained.

[0004] In order to realize such an outlet temperature, the controller controls a heat exchanger for heating the air of the air conditioner and an electric actuator for changing the opening of a mix door for controlling the amount of air bypassing the heat exchanger. It is done by doing.

In this electric actuator, a motor is driven in accordance with electric power supplied from a control device, so that a rotating plate attached to an output shaft is rotated via a speed reduction mechanism. The connected mix door can be operated.

Further, the brush mounted on the output shaft slides on a pattern for switching the power supply to the motor or a pattern portion composed of a variable resistor according to the rotation of the output shaft. , The motor M can be feedback controlled.

That is, the control device can input a voltage corresponding to the position of the brush, that is, the opening of the mixing door by the variable resistor, and can recognize the opening of the mixing door based on this voltage. The driving power can be accurately supplied to the motor by the electric passage formed by the pattern and the brush. Then, the control device controls the mix door to the optimum opening based on the recognized opening of the mix door and the setting of the control device.

[0008]

The brush which slides on the pattern portion of such a conventional electric actuator has a plurality of fitting holes having caulking projections, and the resin material corresponds to the fitting holes. As shown in FIG. 8, the rivet-shaped projections are provided with
After the rivet-shaped protrusion 22 of the resin material 19 is inserted into the brush 20, the head of the rivet-shaped protrusion 22 of the resin material 19 that extends through the fitting hole 21 of the brush 20 is crushed by applying pressure. Crimping projection 2 around fitting hole 21
1a is cut into the upper and lower surfaces and joined.

Therefore, when the electric actuator operates at a temperature different from the temperature at the time of swaging, as shown in FIG. 9, the difference between the coefficient of thermal expansion of the brush 20 and the resin material 19 causes the brush 20 and the resin material 19 to be separated from each other. A displacement of the joining surface occurs, and the caulking strength is reduced. As a result, the brush 20 is rattled, and the stop position of the electric actuator is displaced, so that the quality may be deteriorated.

The reliability is required because the environment in which the car is used, for example, summer and winter, cold northern Europe, and countries near the equator.

Further, the adhesive strength between the brush 20 and the resin material 19 depends only on the caulking strength, and when the material of the resin material 19 is changed, the caulking pressure is adjusted to set conditions for obtaining sufficient caulking strength. Preparation work is required,
Workability was not good.

The present invention has been made in view of such problems of the prior art, and has a sufficient adhesive strength even when the brush shrinks due to a temperature change, and at the same time, has a good workability. An object of the present invention is to provide a quality electric actuator.

[0013]

According to the present invention, there is provided a motor driven in accordance with electric power supplied from a control device, an actuator output shaft to which a driven object is connected, and A substrate on which a pattern for switching power supply and a pattern portion formed of a variable resistor are formed, a resin material attached to the output shaft, and the pattern portion bonded to the resin material and sliding the pattern portion in accordance with the rotation of the output shaft In an electric actuator having a moving brush and capable of controlling a driven object to an optimum position by feedback-controlling the motor, the resin material has a plurality of rivet-shaped protrusions, and the brush is formed of the resin material. A rivet-shaped projection has a fitting through-hole having a crimping projection, and the rivet-like projection is inserted into the fitting through-hole, and the brush is connected to the resin material by swaging. When a electric actuator, characterized in that a portion of the brush is elastically deformed with a deformation means capable of reinforcing the caulking strength between the resin material.

The deformation means is a rib-like projection provided on the resin material between the rivet-like projections, and can elastically deform the brush member between the fitting holes.

The deforming means is a concave portion provided in the brush between the fitting holes, and can elastically deform the brush member between the fitting holes.

The deforming means is a brush plastically deformed in a convex shape with respect to a cross section passing between the fitting holes, and is capable of elastically deforming a brush member between the fitting holes.

Further, the deforming means is a plurality of boss-shaped protrusions provided on the resin material around the rivet-shaped protrusion, and can elastically deform the brush member around the fitting hole.

[0018]

According to the present invention, the adhesive strength between the brush and the resin material is reinforced by the stress due to the elastic deformation of the brush member in addition to the strength due to swaging, so that the brush shrinks due to a temperature change. No play is caused even when the occurrence of a wobble, and the quality of the electric actuator does not deteriorate.

Further, even when the material of the resin material is changed, a sufficient bonding strength can be obtained without adjusting the caulking pressure, and the workability can be improved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic diagram used for explaining a method of joining a brush of an electric actuator according to the present invention, and FIG.
FIG. 3 is a cross-sectional view illustrating a joint state of FIG. 1, FIG. 3 is a cross-sectional view illustrating a contracted state due to a temperature change of the joint section of FIG. 2, FIG. 4 is a schematic configuration diagram of an electric actuator according to the present invention, and FIG. 4
6, FIG. 6 is a front view of the periphery of the gear of FIG. 4, and FIG. 7 is a cross-sectional view showing the joined state of another embodiment, in which FIG. 8 and FIG. 9 are shown. The same members as the members are denoted by the same reference numerals.

In the electric actuator according to the present invention, for example, as shown in FIG. 4, the output shaft 2 of the motor M driven in accordance with the electric power supplied from the control device includes the gears 3, 4a,
The output shaft 5 is connected to an output shaft 5 of an electric actuator rotatably mounted on the lower case 1b by a bearing 11 via a speed reduction mechanism composed of a shaft 4b and the like. A rotating plate 6 connected via a connecting rod 7 is attached to a mixing door which is not to be used, and the rotating plate 6 is rotated by driving a motor M by the control device, and the mixing door 6 is rotated. Can be activated.

The tip of the output shaft 5 has a semicircular shape so that the rotating plate 6 can be mounted in alignment with the position of a brush described later.

The lower case 1b to which the motor M, the gear 4a and the output shaft 5 are attached is provided with a board 9
And a pattern unit 10 for controlling the motor M
The brush mounted on the side surface of the substrate 9 of the output shaft gear 4b slides on the pattern portion 10 in accordance with the rotation of the output shaft 5, so that the control device controls the motor M
Can be feedback controlled.

As shown in FIG. 5, the pattern section 10 includes a pattern 12 for switching power supply to the motor M and a variable resistor (hereinafter, referred to as PBR) as the detector.
13

As shown in FIG. 6, the brush 20 moves these patterns 12 and the PBR 1 according to the rotation of the output shaft 5.
3 slides on the substrate 9 on which it is formed.

The control device controls the brush 20 by the PBR 13.
, That is, the voltage corresponding to the opening of the mixing door, the opening of the mixing door can be recognized based on this voltage.
, The driving power can be supplied to the motor M accurately.

Therefore, the control device can control the mix door to the optimum opening based on the recognized opening of the mix door and the setting of the control device described above. The method will be described.

As shown in FIG. 1, the resin material 19 has a plurality of rivet-like projections 22 attached to the output shaft gear.
The brush 20 is provided with a fitting hole 21 having a caulking projection 21 a corresponding to the rivet-shaped projection 22 of the resin material 19. The resin material 19 has a rib-like projection 23 between the rivet-like projections 22.

For joining, the rivet-shaped protrusion 22 of the resin material 19 corresponding to the fitting hole 21 of the brush 20 is inserted, and the brush 2
2, the head of the rivet-shaped projection 22 of the resin material 19 extending through the through hole 21 of the brush 20 is crushed by pressing, and the resin material 19 is wrapped around the through hole 21 of the brush 20 as shown in FIG. The caulking protrusion 21a is cut into the upper and lower surfaces.

For this reason, the adhesive strength between the brush 20 and the resin material 19 is not only the strength by swaging, but also the rib-like projections 23.
The upper brush member is reinforced by stress due to elastic deformation.

Therefore, as shown in FIG. 3, even when deformation occurs due to a difference in the coefficient of thermal expansion between the brush 20 and the resin material 19 due to a temperature change, the brush 20 continues to bite into the resin material 19 due to the spring force of the brush 20. There is no backlash, and the quality such as the displacement of the stop position of the electric actuator does not decrease.

As described above, the adhesive strength between the brush 20 and the resin material 19 is reinforced by the stress due to the elastic deformation of the brush 20. Therefore, even if the material of the resin material 19 is changed, the swaging pressure must be adjusted. Therefore, sufficient bonding strength can be obtained, and workability can be improved.

As shown in FIG. 7A, the effect of reinforcing the bonding strength by the elastic deformation of the brush 20 is that instead of providing the rib-like projection 23 on the resin material 19, the fitting hole 21 of the brush 20 is used.
It can also be obtained by forming a recess 24 between them.

As shown in FIG. 7B, the brush 2
The same effect can be obtained without forming the concave portion 24 in the brush 20 if the cross section passing between the 0 fitting holes 21 is formed in a distorted shape.

Further, as shown in FIG. 7C, the same applies when a plurality of boss-like protrusions 25 are provided around the rivet-like protrusions 22 of the resin material 19 instead of providing the rib-like protrusions 23.

What has been described above is an embodiment of the present invention, and various changes can be made without departing from the scope of the claims. For example, a brush is joined to a resin material by caulking. The present invention can be applied to any electric actuator as long as it adopts the above method.

For example, the present invention is applicable to an actuator for driving an intake door for selecting air to be introduced into an air conditioner and a mode actuator for switching an outlet mode.

[0039]

As described above, in the present invention, the adhesive strength between the brush and the resin material is reinforced by the stress due to the elastic deformation of the brush member in addition to the strength due to the swaging, so that the resin material is reinforced by the temperature change. Even if shrinkage occurs, there is no backlash due to the difference in thermal properties between the resin material and the brush, and the quality of the electric actuator, such as a shift in the stop position, does not deteriorate.

Further, even when the material of the resin material is changed, a sufficient bonding strength can be obtained without adjusting the caulking pressure, and the workability can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view used to explain a method of joining a brush of an electric actuator according to the present invention.

FIG. 2 is a cross-sectional view showing a bonding state of FIG.

FIG. 3 is a cross-sectional view showing a contracted state due to a temperature change of a joint of FIG. 2;

FIG. 4 is a schematic configuration diagram of an electric actuator according to the present invention.

FIG. 5 is a detailed view of a pattern unit of FIG. 4;

FIG. 6 is a front view around the gear of FIG. 4;

FIG. 7 is a cross-sectional view showing a joined state of another embodiment.

FIG. 8 is a cross-sectional view showing a state in which brushes of a conventional electric actuator are joined.

FIG. 9 is a cross-sectional view showing a contracted state due to a temperature change of the bonding portion in FIG.

[Explanation of symbols]

19 ... resin material, 20 ... brush, 21 ... fitting hole, 21a ... crimping projection, 22 ... rivet-like projection, 23 ... rib-like projection, 24 ... concave part,
25 ... boss-like projections.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01R 39/38 H02K 5/14 H02K 13/00

Claims (5)

(57) [Claims] A motor driven in accordance with electric power supplied from a control device, an actuator output shaft to which a driven object is connected, a pattern for switching power supply to the motor, and a pattern portion including a variable resistor are provided. A substrate that is formed, a resin material attached to the output shaft, and a brush that is joined to the resin material and slides on the pattern portion in accordance with the rotation of the output shaft. In an electric actuator capable of controlling a driven object to an optimum position, the resin material has a plurality of rivet-shaped protrusions, and the brush has a fitting hole having a caulking protrusion corresponding to the rivet-shaped protrusion of the resin material. When the rivet-shaped protrusion is inserted into the fitting hole and the brush is joined to the resin material by caulking, a part of the brush is elastically deformed and Electric actuator, characterized in that it comprises a deformable means capable of reinforcing the caulking strength of the resin material. 2. The apparatus according to claim 1, wherein said deforming means is a rib-like projection provided on said resin material between said rivet-like projections, and is capable of elastically deforming a brush member between said fitting holes. 2. The electric actuator according to 1. 3. The device according to claim 1, wherein said deforming means is a concave portion provided in said brush between said fitting holes, and is capable of elastically deforming a brush member between said fitting holes. Electric actuator. 4. The brush according to claim 1, wherein said deforming means is a brush plastically deformed in a convex shape with respect to a cross section passing between said fitting holes, and is capable of elastically deforming a brush member between said fitting holes. 2. The electric actuator according to 1. 5. The deforming means is a plurality of boss-shaped protrusions provided on the resin material around the rivet-shaped protrusions.
The electric actuator according to claim 1, wherein the brush member around the fitting hole can be elastically deformed.