CN111668979A - Electric actuator - Google Patents

Abstract

The invention provides an electric actuator, which can reliably perform electric connection between a power supply terminal and a connector terminal of a motor. A brush motor (20) having a power supply terminal (26) and a connector terminal (42) are housed in a housing (1) made of an insulating resin. When a space adjusting part (12d) formed on a housing (10) is clamped between one end part of a power supply terminal (26) and one end part of a connector terminal (42), the one end part of the power supply terminal and the one end part of the connector terminal are clamped by a clamping terminal (50), and the power supply terminal (26) and the connector terminal (42) are electrically connected with each other.

Description

Electric actuator

Technical Field

The present invention relates to an electric actuator having a motor in a housing.

Background

For example, an actuator using an electric motor is known as a drive source of an airflow adjustment valve provided in an air-conditioning passage of a vehicle.

As such a motor actuator, for example, patent document 1 discloses an actuator including a motor, a reduction gear set, a rotation sensor, and an upper case and a lower case that house the motor, the reduction gear set, and the rotation sensor. In the motor actuator, one end of a pair of actuator connector terminals housed in a connector housing is connected to a pair of power supply terminals of a motor.

Patent document 2 describes an actuator device including a motor having a pair of power supply terminals, and a pair of power supply terminals connected to a connector-side terminal and coming into contact with the power supply terminals of the motor while applying an elastic force thereto.

Patent document 1: japanese patent laid-open publication No. 2013-5512

Patent document 2: japanese patent laid-open No. 2012 and 90510

Technical problem to be solved by the invention

In the above-described conventional actuator, although soldering, spot welding, or the like may not be necessary for connecting the connector-side power supply terminal and the motor-side power supply terminal, there is a problem that the contact between the two power supply terminals at the contact portion becomes unstable due to vibration of the motor itself, the vehicle, or the like.

Disclosure of Invention

The present invention aims to provide an electric actuator capable of solving the above-mentioned problems of the conventional actuator.

The electric actuator according to the present invention, which has been accomplished to achieve the above object, is characterized in that a brush motor having a power supply terminal and a connector terminal are provided inside a case made of an insulating resin,

in a state where the space adjusting portion formed in the housing is sandwiched between the one end portion of the power supply terminal and the one end portion of the connector terminal, the one end portion of the power supply terminal and the one end portion of the connector terminal are sandwiched by the clamp terminal, and the power supply terminal and the connector terminal are electrically connected to each other.

The electric actuator of the present invention is further preferably characterized by comprising:

"one end portion of the power supply terminal and one end portion of the connector terminal are formed in a flat plate shape parallel to each other",

"the housing is formed by assembling a lower case and an upper case to each other, and the interval adjustment portion is formed in the lower case",

"a pressing portion for pressing the clamp terminal is formed on the upper case",

"the pressing portion presses the clamping terminal from at least two directions",

"the brush is formed of a plate material having elasticity, and one end side of the plate material serves as the power supply terminal".

The invention has the following effects:

according to the electric actuator of the present invention, in a state where the space adjustment portion formed in the housing is sandwiched between the one end portion of the power supply terminal and the one end portion of the connector terminal, the one end portion of the power supply terminal and the one end portion of the connector terminal are sandwiched by the clamp terminal, whereby the power supply terminal and the connector terminal are electrically connected to each other. Therefore, even the terminals having a small thickness can be stably electrically connected to each other by a sufficient clamping force of the clamping terminals.

Drawings

Fig. 1 is a plan view of an electric actuator according to an embodiment of the present invention.

Fig. 2 is a sectional view II-II in fig. 1.

Fig. 3 is a top view of fig. 1 with the upper housing removed.

Fig. 4 is a plan view of fig. 3 with the intermediate gear and the output gear removed.

Fig. 5 is an enlarged plan view of a portion V in fig. 4.

Fig. 6 is a partial perspective view showing a state before the power supply terminal and the connector terminal are connected in the electric actuator according to the embodiment of the present invention.

Fig. 7 is a partial perspective view showing a state after the power supply terminal and the connector terminal are connected in the electric actuator according to the embodiment of the present invention.

Description of the symbols:

1 electric actuator

10 outer casing

11 upper shell

11a upper wall

11b side wall

11c pressing part

11d pressing groove

12 lower shell

12a bottom wall

12b side wall

12c support part

12d gap adjustment part

12e partition wall

20 Motor

21 motor shell

22 bracket

23 shaft

24 commutator

25 electric brush

26 power supply terminal

26a rising part

30 worm wheel

31. 32 intermediate gear

33 output gear

33a output shaft

33b Pattern substrate (パターン substrate)

40 connector part

41 connector pin

42 connector terminal

42a rising part

43 electric brush for pattern (ブラシ for パターン)

50 clamping terminal

50a contact part

50b connecting part

Detailed Description

Hereinafter, an embodiment of an electric actuator according to the present invention will be described with reference to the drawings. In the present specification, the two cases constituting the housing are an upper case and a lower case, which are not limited to the case disposed above and the case disposed below for convenience of description, and the upper and lower cases may be reversed or left and right. Therefore, for example, the "upper case" may be referred to as a "lower case" instead, and the "lower case" may be referred to as an "upper case" instead.

The electric actuator 1 according to the first embodiment of the present invention can be used as a drive source of an air flow control valve of an air conditioner for a vehicle, for example, and will be described in detail with reference to fig. 1 to 7.

The electric actuator 1 of this example includes a motor 20, a worm wheel 30, intermediate gears 31 and 32, an output gear 33, a connector portion 40, and the like in a housing 10.

The housing 10 is formed in a box shape having an internal space by assembling an upper case 11 and a lower case 12, which are molded from an insulating resin such as reinforced plastic, to each other. Each of the upper case 11 and the lower case 12 has a substantially rectangular container shape with one surface opened, the upper case 11 having an upper surface wall 11a and 4 side walls 11b, and the lower case 12 having a bottom surface wall 12a and 4 side walls 12 b.

The motor 20 as a driving source is a brush motor, and includes a motor housing 21 accommodating a stator and a rotor, and a bracket 22 attached to an opening end of the motor housing 21, and a shaft (motor shaft) 23 protrudes from the opposite side of the opening end of the motor housing 21. Two brushes 25 that contact a commutator 24 provided in the rotor are held by the bracket 22.

The brush 25 is formed of a plate material of conductive metal having elasticity. One end sides of the two brushes 25 extend from the bracket 22 in a direction substantially perpendicular to the shaft 23, and serve as power supply terminals 26. In addition, a noble metal is bonded to the plate material of the brush 25 at a portion in sliding contact with the commutator.

A worm wheel 30 is mounted on the shaft 23. The rotational driving force of the shaft 23 is transmitted to an output shaft 33a that rotates integrally with the output gear 33 via the worm wheel 30, the two intermediate gears 31, 32, and the output gear 33. A crank or the like, not shown, is attached to the output shaft 33 a.

A pattern substrate 33b for detecting the position of the output shaft 33a is fixed to one surface of the output gear 33.

The intermediate gears 31 and 32 and the output gear 33 are pivotally supported by bearing portions, not shown, formed in the upper case 11 and the lower case 12.

The connector portion 40 is composed of five connector pins 41, two connector terminals 42 electrically connected to the two power supply terminals 26, three pattern brushes 43 in contact with the pattern substrate 33b, and a holder 44 holding them.

The five connector pins 41 constitute sockets into which plugs for electrical connection with the outside are inserted in a state where the upper case 11 and the lower case 12 are assembled with each other.

The two connector terminals 42 are integrated with the two connector pins 41, and are led out from the holding body 44 toward the two power supply terminals 26.

The three pattern brushes 43 are integrated with the remaining three connector pins 41, are drawn out from the holder 44 toward the pattern substrate 33b, and are brought into sliding contact with the pattern substrate 33b, thereby detecting a voltage value corresponding to the position of the output shaft 33 a.

The power supply terminal 26 of this example has a flat plate-like rising portion 26a whose tip portion is bent at a substantially right angle. The connector terminal 42 also has a flat plate-like rising portion 42a whose tip portion is bent substantially at a right angle. These rising portions 26a and 42a have substantially the same shape and face each other with a predetermined gap therebetween.

The connection portion between the power supply terminal 26 and the connector terminal 42 is disposed above the support portion 12c integrally formed to protrude upward from the bottom wall 12a of the lower case 12. The supporting portion 12c has a rectangular parallelepiped shape as a whole, and a convex spacing adjustment portion 12d and a partition wall 12e are provided on the upper surface thereof so as to be orthogonal to each other.

The height of the spacing adjustment portion 12d and the partition wall 12e is formed to be slightly higher than the height of the rising portion 26a of the power supply terminal 26 and the rising portion 42a of the connector terminal 42.

The width of the space adjustment portion 12d can be arbitrarily set according to the shape of the clamp terminal 50 described later, but is preferably several mm or more in order to ensure a sufficient clamping force of the clamp terminal 50.

The width of the partition wall 12e is not particularly limited, but is preferably several mm or more in order to ensure insulation between the two power supply terminals, between the two connector terminals, and between the two clamp terminals.

The rising portions 26a of the two power supply terminals 26 and the rising portions 42a of the two connector terminals 42 are arranged so as to abut on the two opposing side surfaces of the spacing adjustment portion 12d, respectively, and are arranged on the support portion 12c with a gap equal to the width of the spacing adjustment portion 12 d.

The two power supply terminals 26 and the two connector terminals 42 are disposed on the support portion 12c with the partition wall 12e interposed therebetween.

When the spacing adjustment portion 12d is sandwiched between the rising portion 26a and the rising portion 42a, the rising portion 26a and the rising portion 42a are sandwiched by the clamp terminal 50, and the power supply terminal 26 and the connector terminal 42 are electrically connected to each other.

The clamp terminal 50 is formed of a bent product of a conductive metal or the like, and includes a pair of contact portions 50a having a predetermined interval and an elastic connection portion 50b connecting the pair of contact portions 50 a. The rising portion 26a and the rising portion 42a are sandwiched by the clamp terminal 50 and are in contact with the pair of contact portions 50a, and are sandwiched by a predetermined force by the elastic restoring force of the connecting portion 50b and are electrically connected to each other.

Further, the upper case 11 is provided with a substantially rectangular parallelepiped pressing portion 11c (see fig. 2) at a position facing the support portion 12c of the lower case 12. The pressing portion 11c presses the clamp terminal 50 from above, and has a pressing groove 11d having a triangular cross section on a lower surface.

The coupling portion 50b of the clamp terminal 50 is partially inserted into the pressing groove 11d, and the two inclined surfaces of the pressing groove 11d press the coupling portion 50b of the clamp terminal 50 from two directions.

As described above, in the electric actuator of this example, in a state where the interval adjustment portion 12d is sandwiched between the rising portion 26a and the rising portion 42a, the rising portion 26a and the rising portion 42a are sandwiched by the clamp terminal 50, and the power supply terminal 26 and the connector terminal 42 are electrically connected to each other. Therefore, even if the terminals are thin, the terminals can be electrically connected by a sufficient clamping force of the clamp terminal 50, and the electrical connection can be stably maintained.

In the electric actuator of this example, the rising portion 26a formed at one end of the power supply terminal 26 and the rising portion 42a formed at one end of the connector terminal 42 are formed in flat plate shapes parallel to each other. Therefore, the clamp terminal 50 can be easily attached, and the power supply terminal 26 and the connector terminal 42 can be electrically connected extremely easily.

In the electric actuator of this embodiment, the housing 10 made of insulating resin is formed by assembling the lower case 12 and the upper case 11 to each other, and the distance adjusting portion 12d is integrally formed in the lower case 12, so that the power supply terminal 26 and the connector terminal 42 can be electrically connected to each other reliably without adding a special member.

In the electric actuator of this example, the pressing portion 11c that presses the clamp terminal 50 is formed in the upper case 11. The pressing portion 11c has a pressing groove 11d capable of pressing the clamp terminal 50 from two directions. Therefore, the influence of the vibration is hardly received, and the electrical connection between the power supply terminal 26 and the connector terminal 42 is extremely stably maintained.

In the electric actuator of this example, one end side of the brush 25 formed of a plate material having elasticity is directly used as the power supply terminal 26. Therefore, the board pressure of the power supply terminal 26 is usually about 0.1mm, while the board pressure of the connector terminal 42 is usually about 0.5mm and is very thin. However, since the power supply terminal 26 and the connector terminal 42 sandwich the interval adjustment portion 12d between the rising portion 26a and the rising portion 42a, the interval between the rising portion 26a and the rising portion 42a can be sufficiently secured, and electrical connection can be performed by a sufficient clamping force of the clamp terminal 50.

In the electric actuator of this example, a partition wall 12e is provided in the support portion 12c of the lower case 12, and two power supply terminals 26 and two connector terminals 42 are arranged so as to sandwich the partition wall 12 e. Therefore, there is no fear that the two power supply terminals, the two connector terminals, and the two clamp terminals contact each other, and their short circuit can be reliably prevented.

While the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and it is needless to say that the embodiments described above can be modified as appropriate within a range not departing from the gist of the present invention.

For example, in the above-described embodiment, the one end portion of the power supply terminal 26 and the one end portion of the connector terminal 42 are sandwiched by the clamp terminal 50 from above, but the one end portion and the one end portion of the connector terminal 42 may be sandwiched by the clamp terminal 50 from the lateral direction by changing the shape of the support portion 12 c.

In the above-described embodiment, the one end portion of the power supply terminal 26 and the one end portion of the connector terminal 42 are bent in a flat plate shape, but may be bent in any shape suitable for the shape, for example, depending on the shape of the contact portion 50a of the clamp terminal 50.

In the above-described embodiment, the power supply terminal 26 is provided at one end of the brush 25 formed of an elastic plate material, but a power supply terminal formed of another member may be joined to the brush.

Claims (6)

1. An electric actuator having a brush motor having a power supply terminal and a connector terminal inside a case made of an insulating resin, wherein the electric actuator is provided with the brush motor and the connector terminal

In a state where the space adjusting portion formed in the housing is sandwiched between the one end portion of the power supply terminal and the one end portion of the connector terminal, the one end portion of the power supply terminal and the one end portion of the connector terminal are sandwiched by the clamp terminal, and the power supply terminal and the connector terminal are electrically connected to each other.

2. The electric actuator according to claim 1,

one end portion of the power supply terminal and one end portion of the connector terminal are formed in a flat plate shape parallel to each other.

3. The electric actuator according to claim 1,

the housing is formed by assembling a lower housing and an upper housing, and the interval adjusting part is formed on the lower housing.

4. The electric actuator according to claim 3,

the upper case is provided with a pressing portion for pressing the clamp terminal.

5. The electric actuator according to claim 4,

the pressing portion presses the clamping terminal from at least two directions.

6. The electric actuator according to any one of claims 1 to 5,

the brush is formed of a plate material having elasticity, and one end side of the plate material serves as the power supply terminal.

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