JP3450055B2 - Electric actuator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for use in drive control of movable elements such as an inside / outside air switching damper, an air mix damper or an outlet switching damper of a vehicle air conditioner, and other various elements. It also relates to an electric actuator.

[0002]

2. Description of the Related Art Conventionally, for example, in an electric actuator for driving and controlling an inside / outside air switching damper of an air conditioner for a vehicle, as shown in JP-A-63-28715, the rotation of a motor is disclosed. A gear train that transmits force to the inside / outside air switching damper via a link mechanism, a wiring circuit arranged to control energization to the motor according to the rotational position of the output shaft of this gear train, and this wiring circuit A connector that is connected to form an external circuit, a motor,
A synthetic resin casing for accommodating the gear train and the wiring circuit is provided, and the wiring circuit is constituted by a plurality of good conductive plate materials embedded in the bottom wall of the casing by insert molding. There is a connector in which an end portion is projected into a connector cover integrally formed with a casing to form a connector.

[0003]

By the way, in such a structure, prior to the insert molding of the casing of the wiring circuit, the good conductive plate members of the wiring circuit are adjacent to each other in order to suppress an increase in the number of parts. Preliminarily formed by press working while maintaining a state in which they are partially connected to each other. Further, in each of the good conductive plate members located on both outer sides of each of the good conductive plate members, insert molding auxiliary holes for the casing are preliminarily formed by the press working. Therefore, when insert molding the wiring circuit into the casing, insert molding is performed with the wiring circuit embedded in the bottom wall of the casing while using each auxiliary hole of the wiring circuit for positioning. After that, the connecting portions between the good conductive plate materials of the wiring circuit are punched out by press working. Thereby, the good conductive plate materials are formed as members separated from each other. On the other hand, in the punching process by press working of the connecting portion between the respective good conductive plate materials as described above, the portion corresponding to each connecting portion of the bottom wall of the casing is integrally punched, resulting in the casing. A plurality of punched holes will be formed in the bottom wall of the. Therefore, a state in which foreign matter easily enters the casing through each of the punched holes is brought about. However, in the above configuration, since the wiring circuit is directly insert-molded on the bottom wall of the casing, the invading foreign matter short-circuits each wiring portion of the wiring circuit which should originally be in an electrically insulated state, or intrudes. Foreign matter is caught in the gear train, causing a malfunction of each gear. It is considered that such a situation can be solved by disposing the board on which the wiring circuit is provided separately from the casing. However, simply disposing the board separately cannot deal with the problems described below and is insufficient. is there. That is,
In the above configuration, since the wiring circuit also integrally configures each terminal of the connector, soldering connection between them is unnecessary, but between each terminal between this wiring circuit and the motor. Connection must be made separately. In such cases,
When this connection is made by soldering, the solder particles are scattered during the soldering, and the scattered solder particles remain in the casing and are caught between the gears in the gear train, causing malfunction. It causes trouble.

Further, in the above structure, the structure for holding the motor in the casing is such that the motor is held only by sandwiching the motor at its axial end between a pair of holding plate members standing on the bottom wall of the casing. Therefore, there is also a problem in that the motor is easily displaced by being displaced from between the holding plate members during operation. Therefore, in order to deal with the above, the present invention separately employs a base including a substrate for arranging a wiring circuit in various electric actuators and effectively utilizes this base to prevent foreign matter from entering. It is an attempt to prevent this, to eliminate the need for soldering connection at all, and to always assemble and hold the motor in a proper position by a simple assembly work.

[0005]

In order to solve the above problems, the present invention includes (a) a casing (10) and a cover (50).
The motor (30) and gear train (40) are arranged in a closed space
And only the output shaft (47) and connector (22) are exposed.
An electric actuator, comprising : (b) projecting upward from the bottom of the inner surface of the casing (10).
A plurality of rod-shaped protrusions (12a, 12a)
a, 12a), and (c) project upward from the rear of the inner surface of the casing (10).
A bifurcated stopper (14) which is provided integrally with the protrusion , and (d) the plurality of rod-shaped projections (12a, 12a, 12a)
The support holes (21a, 21a, 21a) are engaged with
Base (20) fixed to the bottom of the casing (10)
If either (e) said base (20) is a synthetic resin having elasticity
Consisting of a substrate (21), a connector (22), a blocking plate (2)
3), the holding members (24a, 24b) and the receiving shaft (25,
26, 27) are integrally formed, and (f) one of the wiring circuits (28) is provided in the base (20).
That the part is buried, and (g) a pair of plate-shaped connections continuous with the wiring circuit (28).
A terminal (29, 29 ), and (h) a plurality of connectors connected to the wiring circuit (28)
The terminals (22b, 22c, 22d) and (i) the blocking plate (23) is the forked stopper.
The front end face of the motor (30) whose rear end face is in contact with (14)
And it is provided at a position abutting the (j) the clamping member (24a, 24b) is arcuate ne
Then, the blocking plate (23) and the bifurcated stopper (1)
4) Side circle of the motor (30) whose front and rear end surfaces are in contact with each other
It is arranged so that the tube part is sandwiched by its elasticity.
And Rukoto, (k) the nest shaft (25, 26, 27) is a gear (40
b, 40c, 40d) rotatably supported, and (l) the pair of plate-like connection terminals (29, 29)
Contacts the terminals (31, 31) of the motor (30)
With being urchin arranged in (m) the cover (50), said base (20)
The position where the tip comes into contact with the tip of the receiving shaft (25, 26, 27)
Is provided with a shaft-shaped receiving portion (52, 53, 54)
It is characterized by including that. Also, the pair
One plate-shaped connection terminal (29, 29)
Bases (29a, 29a) made of a plate of
The plate width is divided in two from a) and extends in parallel via the bend.
It is characterized in that it is composed of a sandwiching portion (29b, 29b) that projects.
Can be

[0006]

In the present invention thus constructed, the base is separately adopted as an independent component,
This base uses the synthetic resin substrate as a basic constituent member, and when the substrate is molded, the wiring circuit is embedded,
The holding members are molded, the connection terminals are erected, and the connectors are molded integrally. Then, in assembling the electric actuator of the present invention, while holding each motor terminal of the motor by the forked holding portion of each connection terminal, the motor is mounted on the substrate of the base by the outer peripheral surface of the motor. The clamping member resists the elasticity and clamps. After that, the gear train is pivotally supported by the base plate, the casing, and the cover.

[0007]

As described above, since the base having the substrate and the like is adopted as an independent component,
After assembling the motor to the base and at the same time sandwiching and connecting the motor terminals to the connection terminals,
The assembly of the electric actuator can be easily completed only by the work of housing the base in the casing and then assembling the cover to cover the base. In such a case, the assembling of the motor to the base and the connection of each of the motor terminals to each of the connection terminals are performed while holding each of the motor terminals in the bifurcated holding portion of each of the connection terminals against the elasticity thereof. , The motor can be easily and surely held only by holding the motor on its outer peripheral surface against the respective holding members against its elasticity, and the respective states of the assembling and connection may be displaced due to vibration or the like. Instead, it can always be properly maintained by the elastic clamping action.

Further, as described above, since the base having the substrate and the like is separately adopted as an independent component and the base is housed in the casing, an extra hole is formed in the casing when the base is formed. Therefore, foreign matter such as dust does not enter the casing. As a result, foreign matter does not adhere between the wiring portions of the wiring circuit to cause a short-circuit failure, and foreign matter is not caught between the gears of the gear train to cause malfunction. . Further, when the electric actuator is assembled, the electric connection between the motor terminals and the wiring circuit is achieved by sandwiching the motor terminals by the connection terminals.
No need to connect by soldering. Therefore, it is possible to always keep the operation of the gear train smoothly without causing a situation in which the solder particles scattered during the soldering connection are caught between the gears of the gear train.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show an electric actuator according to the present invention which is used for switching control of an inside / outside air switching damper of a vehicle air conditioner. The electric actuator includes a base 20 and a motor 3 in a casing 10.
0 and the gear train 40 are assembled together with the base 2
0, the motor 30, and the gear train 40 are almost covered with a cover 50, and the cover 50 is assembled to the casing 10.

As shown in FIGS. 4 and 5, the casing 10 is integrally molded of a synthetic resin material so that the peripheral wall 10b extends in an L shape from the outer peripheral edge of the bottom wall 10a. An annular receiving portion 11 for rotatably fitting and supporting a lower end portion of an output shaft 47 of the gear train 40, which will be described later, is provided on the front right side portion (upper right side portion in FIG. 4) of the gear 10a. It is formed as shown by 4. Further, on the inner surface of the bottom wall 10a, receiving portions 12 for receiving the base 20 are projectingly formed in a lattice shape as shown in FIGS. 4 and 5, and the receiving portion 12 has a base. As shown in FIG. 4, three rod-shaped projections 12a to 12a for preventing lateral displacement of 20 are provided so as to be located at each vertex of the triangle. At the right rear end of the peripheral wall 10b of the casing 10,
A notch 13 for inserting a connector 22 of a base 20 described later is formed (see FIGS. 4 and 5). In addition,
4 and 5, reference numeral 14 is a base 2 described later.
0 shows a forked stopper fitted to the central rear end recess 21b of the base plate 21 for fixing the end of the motor 30;
Reference numerals 15 and 16 respectively denote a claw and an annular boss for assembling the cover 50.

As shown in FIGS. 11 and 12, the base 20 is assembled in the casing 10. The base 20 is made of a synthetic resin material having elasticity and electrical insulation so that the base 20 can be installed in the casing 10. A substrate 21 having an outer shape to be accommodated, a connector 22 for connecting to an external circuit, a blocking plate 23 for blocking forward movement of the motor 30, a pair of front and rear sandwiching plates 24a and 24b, and a gear train 40 are received. Receiving shafts 25, 26 and 27 for receiving
Are integrally formed (see FIGS. 6 to 12).
Further, at the time of this integral molding, the wiring circuit 28 (see FIG. 6)
And a pair of left and right plate-like connection terminals 2 for electrically connecting the pair of left and right motor terminals 31, 31 (see FIGS. 1, 13 and 14) of the motor 30 to the wiring circuit 28.
9, 29 (see FIGS. 1 and 6 to 12) are integrally provided. In addition, in the center of the substrate 21, each support hole 2
1a to 21a are the protrusions 12a to 12a as shown in FIG.
12a, and the bottom wall 10 of the casing 10 is provided in each of the support hole portions 21a to 21a.
a is inserted from below by each protrusion 12a of the receiving portion 12 to prevent the substrate 21 from moving in the left and right and front and rear directions. Further, in FIG. 6, reference numeral 21c indicates a through hole through which a lower end portion of an output shaft 47 described later is inserted.

As shown in FIGS. 6, 7, 8 and 9, the connector 22 is integrally formed in a rectangular parallelepiped shape so as to project rightward and upward from the rear portion of the right edge of the substrate 21. The connector 22 extends outward through the notch 13 of the casing 10 (see FIGS. 1 and 11). Further, the connector 22 is configured by providing connector terminals 22b to 22d in a connector member 22a,
As will be described later, the terminals 22b to 22d integrally extend from a part of the wiring circuit 28, pass through the base portion of the connector member 22a, and extend in parallel into the opening of the connector member 22a (see FIGS. 6 to 9). . The blocking plate 23 is the substrate 21.
Is integrally formed so as to extend upward from the center in the front-rear direction of the upper surface of the motor 30. The blocking plate 23 comes into contact with the front end surface of the motor 30 and prevents the motor 30 from moving forward. Play a role in holding.

As shown in FIGS. 6 to 9, the pair of plate-shaped holding members 24a and 24b are integrally formed by extending in an arc shape upward from the rear side of the upper surface of the substrate 21. The plate-shaped holding members 24a and 24b extend in parallel with each other in the left-right direction at predetermined intervals in the front-rear direction.
The plate-shaped holding members 24a and 24b are slightly smaller than the outer diameter of the motor 30 as they approach the respective tip portions, and the arc lengths of the holding members 24a and 24b are the same as those of the motor. It is slightly longer than the half circumference of 30. Therefore, the assembling and holding of the motor 30 in the plate-shaped holding members 24a and 24b is performed by the outer peripheral surface of the motor 30 so that the tip ends of the plate-shaped holding members 24a and 24b are resisted to the outside. This is done by inserting the motor 30 into the plate-shaped holding members 24a and 24b from above while pushing the front end surface of the motor 30 along the blocking plate 23 so as to push it open. As a result, the motor 30 is prevented from moving forward by the blocking plate 23 and is blocked from moving backward by the stopper 14 by the plate-shaped holding members 24a and 24b on the outer peripheral surface thereof. It is clamped by elasticity and firmly held to prevent it from coming out upward.
The motor 30 has its output shaft 32 rotatably extending forward through the central portion of the blocking plate 23.
A worm gear 40a of the gear train 40 is coaxially supported on the output shaft 32 of the same so as to be relatively non-rotatable (see FIGS. 1 to 3 and 13).

As shown in FIGS. 7 and 8, the receiving shaft 25 is composed of a base portion 25a extending upward from the substrate 21 and a shaft support portion 25b extending upward from the upper end of the base portion 25a. And the gear 40b of the gear train 40 is the shaft support 2
5b is coaxially and rotatably supported on the upper end of the base portion 25a. In such a case, the gear 40b is
As shown in FIG. 2, the helical gear portion 41 and the spur gear portion 42 are coaxially provided, and the helical gear portion 4
1 is located immediately below the spur gear portion 42 as shown in FIG. 2, and the worm gear 4 is provided as shown in FIGS.
It meshes with 0a. As shown in FIGS. 6 and 7, the receiving shaft 26 has a base portion 26a extending upward from the substrate 21.
And the shaft supporting portion 2 extending upward from the upper end of the base portion 26a.
6b and the gear 40c of the gear train 40.
Is rotatably supported by the rotatably supporting portion 26b so that the base 2
It is received on the upper end of 6a. In such a case, the gear 40
c is both spur gear parts 4 as shown in FIGS.
3, the spur gear 44 is located immediately above the spur gear portion 43 as shown in FIG. 2 and meshes with the spur gear portion 42 of the gear 40b as shown in FIGS. ing.

The receiving shaft 27 is shown in FIG. 6, FIG. 8, FIG. 9 and FIG.
1, the right side of the receiving shaft 26 extends from the base plate 21 and rotatably supports the gear 40d of the gear train 40. In this case, the gear 40d is coaxially provided with both spur gear portions 45 and 46 as shown in FIGS. 1 and 2, and the spur gear 46 is located directly above the spur gear portion 45 as shown in FIG. As shown in FIGS. 1 and 2, the gear 40c meshes with the spur gear portion 43 of the gear 40c.
On the right side of the receiving shaft 27, the output gear 40e of the gear train 40
(See FIG. 15), the lower end of the output shaft 47 is coaxially fitted into the shaft support hole 11 of the substrate 21, and the upper end of the output shaft 47 is inserted into a through hole 51 of a cover 50 described later. Is rotatably supported. This output gear 40e
Meshes with the spur gear portion 45 of the gear 40d as shown in FIGS.

As shown in FIGS. 2, 3 and 15, a brush Br is provided on the lower surface of the output gear 40e to detect the rotational position of the output shaft 47 in cooperation with the wiring circuit 28. The brush Br extends toward the upper surface of the substrate 21 and comes into contact with a part of the wiring circuit 28 at its tip end so as to be relatively movable. In such a case, the brush Br is
It moves along a part of the wiring circuit 28 while rotating in an arc shape with the rotation of e. The wiring circuit 28 has its upper surface exposed upward, and when the base 20 is integrally molded, the wiring circuit 28 shown in FIG.
As shown in FIGS. 9, 11 and 12, the wiring circuit 28 is embedded in the upper surface of the substrate 21, and the wiring circuit 28 has four wirings 28a, 28b, 2 as shown in FIGS.
It is composed of 8c and 28d. The wiring 28a is
The one end portion 28aa is arranged in an arc shape along the outer circumference of the output shaft 47 of the output gear 40e, while the other end portion 28ab is arranged.
At the rear end of the left side of the board 21 at the left side connection terminal 29.
So as to be connected to the lower end of the substrate 21 and extend along the front and left sides of the upper surface of the substrate 21.

The wiring 28b has one end 28ba arranged in an arc shape along the arc-shaped one end 28aa of the wiring 28a, while the other end 28bb serves as a connector terminal 22b of the connector 22 from the left rear portion of the substrate 21. It extends along the right front part, the central part, and the right rear part of the upper surface of the substrate 21 so as to extend. The wiring 28c has an arcuate end 28ca, which is one end thereof, arranged along the arcuate end 28ba of the wiring 28b, while the other end 28c is disposed.
b extends along the upper wiring 28b on the upper surface of the board 21 so as to extend from the right rear portion of the board 21 as the connector terminal 22d of the connector 22. The wiring 28d is arranged so that one end 28da thereof is connected to the lower end of the right side terminal 29, while the other end 28db is extended into the connector 22 as a connector terminal 22e, so that the wiring 28d is on the right side of the upper surface of the substrate 21. It extends in an L shape at the rear. Then, the arc-shaped one end portions 28aa, 28ba, 28ca of the wirings 28a, 28b, 28c are connected to the brush Br.
And the brush Br together form a detection mechanism for detecting the inside air introduction position and the outside air introduction position of the inside / outside air switching damper. In the present embodiment, in order to ensure electrical insulation between the motor 30 and the wiring circuit 28, the wiring of the wiring circuit 28 is formed on the rear portion of the upper surface of the substrate 21 so as to cover the broken line portion shown in FIG. The insulating layer L is formed of a resin coating of an electrically insulating material.

Since both connection terminals 29, 29 have the same configuration, the configuration of the left connection terminal 29 will be described as an example. Left connection terminal 29
As shown in FIGS. 1, 6, 8, 9 and 11, the plate width direction is arranged along the front-back direction of the board 21, and the left side terminal 29 of the board 21 is A base portion 29a standing upward from the left rear end portion and the base portion 2
It is composed of two sandwiching portions 29b, 29b which are divided into two parts along the vertical direction at right angles to the plate width direction from 9a and extend upward. In such a case, both clamping parts 29b, 29b are pushed and opened in the left-right direction against the elastic force so that the left terminal 31 of the motor 30 is inserted and clamped between them in FIGS. 9 and 10. As shown, the base portion 29a is used as a reference and is symmetrically configured to the left and right. The right terminal 29 is configured to hold the right terminal 31 of the motor 30 by both holding portions 29b and 29b in the same manner as the left terminal 29.

As shown in FIGS. 16 and 17, the cover 50 is constructed by extending an upper wall 50a to a peripheral wall 50b in an L shape. A through hole portion 51 is coaxially formed in the right front portion (upper left portion in FIG. 16) of the upper wall 50a so as to face the output shaft 47 of the output gear 40e. Is rotatably supported by inserting the upper end portion of the output shaft 47 of the output gear 40e (see FIG. 2).
Each of the receiving portions 52, 53 and 5 is provided on the left front portion of the upper wall 50a.
No. 4 is provided so as to be coaxially opposed to each of the receiving shafts 25, 26 and 27, and these receiving parts 52, 53 and 54 respectively connect the upper ends of the shafts of the gears 40b, 40c and 40d. Each is rotatably received. Also, the cover 50
A pair of pressing parts 55, 5 are provided on the inner surface rear part of the upper wall 50a.
6 is a pair of plate-shaped holding members 24a, 24b of the base 20.
And the pressing portions 55 and 56 are formed in the same shape as each other. In this case, if the holding portion 55 is taken as an example, the cross section in the left-right direction has a shape shown in FIG. 18, and the lower surface of the holding portion 55 (the surface facing the plate-shaped holding member 24a) is the motor 3.
It is formed in an arc shape so as to press the outer peripheral surface of 0 toward the substrate 21 from above. The peripheral wall 5 of the cover 50
0b is provided with a square annular engaging portion 57 at a position corresponding to each claw 15 of the peripheral wall 10b of the casing 10. The corresponding claw 15 is engaged with each engaging portion 57. . Further, the casing 1 is provided on the peripheral wall 50b of the cover 50.
The respective annular boss portions 58 are provided in correspondence with the respective boss portions 16 of 0, and these corresponding boss portions 16 and 58 are, when the electric actuator is mounted on the air conditioner to which they are applied,
They are fastened together by bolts and nuts.

In the present embodiment configured as described above,
The assembly sequence of the electric actuator according to the present invention will be described. First, the casing 10, the base 20, the motor 30, the worm gear 40a, the gears 40b to 40e, and the cover 50 are prepared in advance. Then, the base 20 is gripped above the casing 10, the protrusions 12 a to 12 a of the bottom wall 10 b of the casing 10 are inserted into the support hole portions 21 a to 21 a of the substrate 21 from below, and the substrate 2 is inserted.
While inserting the connector 22 of No. 1 into the notch 13 of the casing 10 from above, the base 20 is accommodated in the casing 10 along the peripheral wall 10b thereof. As a result, the base 20 is assembled in the casing 10 as shown in FIGS. 11 and 12.

After that, the worm gear 40a is coaxially supported on the output shaft 32 of the motor 30 coaxially as shown in FIG. In this way, the motor 30 having the worm gear 40a axially supported is gripped in a state of facing the front of the casing 10, and the blocking plate 23 of the substrate 21 and the two plate-shaped holding members 2 are held.
Keep above 4a, 24b. Then, the front end surface of the motor 30 is placed along the rear surface of the blocking plate 23, and the outer peripheral surface of the motor 30 is inserted into both plate-shaped holding members 24a and 24b against the elasticity thereof so that the front end portions of these plate-shaped holding members are removed. Insert it while pushing it outward. As a result, the motor 30 has its front end face prevented from moving forward by the blocking plate 23 and is prevented from moving in the front-rear direction by the stopper 14,
Moreover, both plate-shaped holding members 24a, 24b are provided on the outer peripheral surface thereof.
It is clamped by and is held immovably in the lateral direction and upward. Further, in the process of inserting the outer peripheral surface of the motor 30 into the plate-shaped holding members 24a and 24b as described above, the motor terminals 31 and 31 of the motor 30 are also connected to the connection terminals 2.
The sandwiching portions 29b and 29b of 9 and 29 are inserted and sandwiched while pushing these sandwiching portions outwardly against their elasticity. Thus, the motor terminals 31, 31 of the motor 30 and the connection terminals 29, 29 can be connected at the same time when the motor 30 is inserted into the plate-shaped holding members 24a, 24b. In such a case, each motor terminal 31 of the motor 30,
Since it is not necessary to perform soldering for electrical connection between 31 and each of the connection terminals 29, 29, solder particles do not remain in the casing 10 and cause a short circuit failure between the wirings of the wiring circuit 28. .

After that, the gear 40b is coaxially inserted from the helical gear portion 41 into the receiving shaft 25 of the substrate 21, and the helical gear portion 41 is engaged with the worm gear 40a to be pivotally supported. Then, the output gear 40e is rotatably supported in the annular receiving portion 11 of the casing 10 by inserting the lower end portion of the output shaft 47 through the through hole 21 of the substrate 21, and the gear 40d is attached to the spur gear portion 45 thereof. Output gear 4
It is coaxially inserted into the receiving shaft 27 while being meshed with 0e and is rotatably supported. At this time, the brush Br is connected to the wiring circuit 28.
One end 28aa, 28ba, and 28ca of each wiring are contacted. Then, replace the gear 40c with the spur gear portion 4
3 is coaxially inserted into the receiving shaft 26, and the spur gear portion 43 is meshed with the spur gear portion 46 of the gear 40d while the spur gear 44 is meshed with the spur gear portion 42 of the gear 40b so as to be pivotally supported. This completes the assembly of the gear train 40.

In this way, the base 20 and the gear train 4 are
0 is completed, the cover 50 is held by the casing 10 and the through hole 51 of the upper wall 50a of the cover 50 is held.
The upper ends of the output shafts 47 of the output gears 40e are inserted into the respective receiving portions 52, 53, 54, and the respective gear shafts 40b, 40
Each pressing portion 5 while coaxially supporting the upper ends of c and 40d
5, 56, the outer peripheral surface of the motor 30 is pressed down from above to be engaged with the casing 10, and the engaging portions 57
Is engaged with each claw 15. After that, at the time of mounting on the air conditioner as an application target, the corresponding bosses of the casing 10 and the cover 50 are fastened with bolts and nuts. This completes the assembly of the electric actuator. When the electric actuator thus assembled is operatively connected to the inside / outside air switching damper to operate, the motor 30 rotates, the gear train 40 rotates, and the output shaft 47 rotates. Along with this, the brush Br becomes the wiring circuit 2
It rotates while being in contact with one end of each wiring of No. 8. As a result, the brush Br detects the inside air introduction position or the outside air introduction position of the inside / outside air switching damper at its rotating end and energizes the motor 30, and the inside / outside air switching damper is driven from the motor 30 via the gear train 40. It operates by receiving torque.

In the present embodiment described above, the base 20 is separately adopted as an independent constituent element, and the base 20 uses the substrate 21 as a basic constituent member and the substrate 2
When molding 1, the wiring circuit 28 is embedded, and each sandwiching member 2 is formed.
4a, 24b, the connection terminals 29, 29 are erected and the connector 22 is integrally formed. When assembling the electric actuator of the present invention, the motor terminals 31, 31 of the motor 30 are
A forked holding part 29b of each connection terminal 29, 29,
29b, the motor 30 is mounted on the substrate 21 of the base 20 on the outer peripheral surface of each of the holding members 24a, 2b.
It is clamped by 4b against its elasticity. After that, the gear train 40 is rotatably supported by the substrate 21, the casing 10 and the cover 50.

Thus, the base 2 having the substrate 21 and the like
Since 0 is separately adopted as an independent component, the motor 30 is assembled to the base 20, and at the same time, the motor terminals 31 and 31 are sandwiched and connected to the connection terminals 29 and 29, and then the base 20 is connected to the casing 10. It is housed inside, and after that, only the work of assembling the cover 50 to the casing 10 so as to cover the base 20,
Assembly of the electric actuator can be completed easily. In this case, the motor 30 is attached to the base 20, and the motor terminals 31 and 31 are connected to the connection terminals 2.
For electrical connection to the motor terminals 9, 29, the motor terminals 31, 31 are connected to the bifurcated holding portions 29 b, 2 of the connection terminals 29, 29.
9b is clamped against its resilience, while the motor 30 is clamped by the clamping members 24a, 24b against its resilience on its outer peripheral surface, the motor 30 can be easily and surely assembled and connected and connected. The respective states can be always maintained properly by the elastic clamping action described above without causing a positional shift due to vibration or the like.

Further, as described above, the base 20 having the substrate 21 and the like is separately adopted as an independent component, and the base 20 is housed in the casing 10.
No extra holes are formed in the casing 10 when the casing 10 is formed, and therefore foreign matter such as dust is not generated.
Never enter inside. As a result, foreign matter does not adhere between wiring portions of the wiring circuit 28 to cause a short-circuit failure, and foreign matter is not caught between the gears of the gear train 40 to cause malfunction. . When assembling the electric actuator, each motor terminal 3
Since the electrical connection between the motor terminals 31 and 31 and the wiring circuit 28 is achieved by sandwiching the connection terminals 29 and 29 of 1 and 31 with each other, the connection by soldering is not necessary at all. Therefore, there is no possibility that the solder particles scattered at the time of soldering connection are bitten into each gear of the gear train 40, and the operation of the gear train 40 can always be maintained smoothly.

In the practice of the present invention, instead of both holding members 24a, 24b, for example, a single wide arc-shaped and plate-shaped holding member is adopted, and the outer peripheral surface of the motor 30 is held by this holding member. You may carry out by pinching by the elasticity. Further, in carrying out the present invention, not only the inside / outside air switching damper of the air conditioner, but also the blower outlet switching damper, the air mix damper, and the electric drive adopted for controlling the movable elements of various devices other than the air conditioner. The present invention may be applied to an actuator for implementation.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an electric actuator according to the present invention without a cover.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG.

4 is a plan view showing the casing of FIG. 1. FIG.

5 is a sectional view taken along the line 5-15 of FIG.

FIG. 6 is a plan view of the base of FIG.

FIG. 7 is a left side view of the base.

FIG. 8 is a right side view of the base.

FIG. 9 is a rear end view of the base.

10 is an enlarged rear end view of a main part of the motor terminal connecting terminal of FIG. 9. FIG.

FIG. 11 is a plan view showing a state in which the base is assembled in the casing.

12 is a sectional view taken along line 12-12 in FIG.

FIG. 13 is a plan view showing a state in which a worm gear is attached to the motor.

FIG. 14 is a rear end view of the motor.

FIG. 15 is a side view showing a state where a brush is attached to the output gear.

16 is a bottom view showing the cover of FIG. 1. FIG.

17 is a cross-sectional view taken along the line 17-117 in FIG.

FIG. 18 is a sectional view taken along the line 18--18 in FIG.

[Explanation of symbols]

10 ... Casing, 20 ... Base, 21 ...
Substrate, 22 ... Connector, 22b-22d ... Connector terminal, clamping member ... 24a, 24b, 28
... Wiring circuit, 29 ... Connection terminal, 30 ...
・ Motor, 31 ・ ・ ・ Motor terminal, 40 ・ ・ ・ Gear train,
47 ... Output shaft, 50 ... Cover, Br ... Brush.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-270246 (JP, A) JP-A-63-28715 (JP, A) Actually open 5-41374 (JP, U) Actually open 2- 85612 (JP, U) Actually opened 58-116407 (JP, U) Actually opened 57-177814 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60H 1/00-3 / 06

Claims (2)

(57) [Claims] 1. A casing (10) and a cover (5)
The motor (30) and the gear train (4
0) is arranged and the output shaft (47) and the connector (22)
An electric actuator in which only a portion of the casing (10) is exposed.
A plurality of rod-shaped protrusions (12a, 12a)
a, 12a), and (c) project upward from the rear of the inner surface of the casing (10).
A bifurcated stopper (14) which is provided integrally with the protrusion , and (d) the plurality of rod-shaped projections (12a, 12a, 12a)
The support holes (21a, 21a, 21a) are engaged with
Base (20) fixed to the bottom of the casing (10)
If either (e) said base (20) is a synthetic resin having elasticity
Consisting of a substrate (21), a connector (22), a blocking plate (2)
3), the holding members (24a, 24b) and the receiving shaft (25,
26, 27) are integrally formed, and (f) one of the wiring circuits (28) is provided in the base (20).
That the part is buried, and (g) a pair of plate-shaped connections continuous with the wiring circuit (28).
A terminal (29, 29), and (h) a plurality of connectors connected to the wiring circuit (28)
The terminals (22b, 22c, 22d) and (i) the blocking plate (23) is the forked stopper.
The front end face of the motor (30) whose rear end face is in contact with (14)
And it is provided at a position abutting the (j) the clamping member (24a, 24b) is arcuate ne
Then, the blocking plate (23) and the bifurcated stopper (1)
4) Side circle of the motor (30) whose front and rear end surfaces are in contact with each other
It is arranged so that the tube part is sandwiched by its elasticity.
And Rukoto, (k) the nest shaft (25, 26, 27) is a gear (40
b, 40c, 40d) rotatably supported, and (l) the pair of plate-like connection terminals (29, 29)
Contacts the terminals (31, 31) of the motor (30)
With being urchin arranged in (m) the cover (50), said base (20)
The position where the tip comes into contact with the tip of the receiving shaft (25, 26, 27)
Is provided with a shaft-shaped receiving portion (52, 53, 54)
Electric actuator, comprising a Rukoto, the. 2. The pair of plate-shaped connection terminals (29,
29) are bases (29a, 2 and 2) each made of one plate.
9a) and the base part (29a) is divided into two plate widths and bent
Holding part (29b, 29b) extending in parallel via the part
2. The electric actuator according to claim 1, characterized in that
The player.