JP2003324294A - Brush and motor actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brush which can efficiently dissipate generated heat without adding another member to radiate the heat generated at an electronic circuit board, and to provide a motor actuator. <P>SOLUTION: In the motor actuator 10 comprising: a brush 46 for grounding to detect a rotation angle brought into slide contact with a pulse pattern plate; and a control board 60 for drive-controlling a motor 20; the brush 46 is connected to the board 60, and the brush 46 has a heat sink hole 46e for increasing a heat sink area and fins 46f for the heat sink. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush and a motor actuator, and more particularly to a brush connected to an electronic circuit board for drive control and a motor actuator having the electronic circuit board built in a case.

[0002]

2. Description of the Related Art In a motor or the like in which an electronic circuit board for drive control is built in a motor frame, an electronic component mounted on the electronic circuit board generates a large amount of heat when energized when the motor is driven. In particular, when an IC having a motor control circuit integrated and mounted on a chip is mounted, a large amount of heat is generated in the IC.

Since this heat causes malfunction of electronic parts, measures have been taken to radiate this heat. For example, a dedicated heat sink is provided on the electronic circuit board as a heat radiating means, or the size of the heat generating member such as the IC is increased.

There is also a technique of using another component of the motor instead of the heat sink. For example, an arm-shaped metal bracket, which is a motor case, is placed so as to cover the electronic circuit board on which the electronic components are mounted, and the heat generating portion surface of the electronic component that generates a large amount of heat on the electronic circuit board is interposed with an insulating sheet. There is a technique in which the bracket is brought into contact with the bracket (see Japanese Patent Laid-Open No. 2001-178070). With this configuration, the heat generated in the electronic component can be efficiently dissipated to the metal bracket.

[0005]

However, when a dedicated heat sink is provided, there are problems that the number of parts increases and the parts management cost increases, and the number of assembling steps at the time of manufacturing increases. Further, when the size of the IC is increased, there is a problem that the size of the motor is also increased.

Further, in the technique of using another component member of the motor instead of the heat sink, there is a problem that the other component member is limited to a member having good thermal conductivity, and the arrangement of the electronic circuit board is limited.

In view of the above problems, an object of the present invention is to provide a brush capable of efficiently dissipating the generated heat without adding a separate member for dissipating the heat generated in the electronic circuit board, and the brush. It is to provide a used motor actuator.

[0008]

According to the brush of the present invention, there is provided a brush connected to an electronic circuit board, wherein a heat radiation hole or a heat radiation fin for increasing a heat radiation area is provided. It is solved by providing at least one of.

Although heat is generated in the electronic circuit board during operation, the brush connected to the electronic circuit board is provided with the holes for heat dissipation and the fins for heat dissipation, so that a separate component such as a heat sink is not used. The heat generated is dissipated.

According to another aspect of the motor actuator of the present invention, there is provided a pattern plate for detecting a rotation angle, a brush slidably contacting the pattern plate, and an electronic circuit board for controlling the drive of the motor. In the motor actuator provided with, the brush is connected to the electronic circuit board, and the brush is provided with at least one of a heat dissipation hole or a heat dissipation fin for increasing a heat dissipation area. It

With the above structure, the heat generated in the electronic circuit board due to the operation of the motor actuator is conducted to the brush, and this heat is transferred from the heat radiation holes and the heat radiation fins formed in the brush to the outside. Be dissipated in. This is preferable because it is not necessary to provide a heat sink as a separate member to the motor actuator as in the conventional case, and it is not necessary to increase the size of an electronic component such as an IC for heat dissipation.

Further, since the brush also has a function as a heat sink, it is possible to change the arrangement of members in the motor actuator as in the case of using another component member of the motor actuator as a heat sink as in the conventional example. It is suitable because it does not involve design changes.

According to a third aspect of the present invention, the electronic circuit board is provided with electronic circuit parts, and the electronic circuit board is made of a conductive material for heat dissipation connected to a predetermined terminal of the electronic circuit part. It is preferable that a ground pattern is formed and the brush is connected to the ground pattern.

As described above, since the heat is conducted from the electronic circuit component such as the IC to the ground pattern formed on the electronic circuit board, the heat conducted to the ground pattern is dissipated from the ground pattern to the outside atmosphere. . That is, since the ground pattern serves as a buffer area for diffusing the heat generated in the electronic circuit component, it is possible to prevent the temperature of the electronic circuit component from rising. Further, since the heat is conducted from the ground pattern to the brush, the heat generated in the electronic circuit component can be efficiently dissipated by the ground pattern and the brush.

Further, as described in claim 4, the brush may be a position sensor brush or a ground brush. For example, the heat dissipation effect can be improved by forming the heat dissipation holes and the heat dissipation fins for both the position sensor brush and the ground brush.

Further, as described in claim 5, the motor actuator can be used as a damper driving means of a vehicle air conditioning system. Since the motor actuator of the present invention is configured to dissipate the heat generated in the electronic circuit board more efficiently than the brush, the air conditioning in the vehicle can be performed without causing malfunction even when the indoor and outdoor temperatures are high. Is preferable because it can be reliably performed.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to a motor actuator 10 used in a vehicle air conditioning system S will be described below with reference to the drawings. The members, arrangements, etc. described below do not limit the present invention, and it goes without saying that various modifications can be made in accordance with the spirit of the present invention.

FIG. 1 is a schematic diagram of a vehicle air conditioning system, and FIG.
Is a partial sectional view of the motor actuator, FIG. 3 is an explanatory view of a control board of the motor actuator, FIG. 4 is an electrical configuration diagram of the motor actuator, FIG. 5 is a perspective view of a ground brush, and FIG. 6 shows a mounting state of the brush. Schematic diagram, Fig. 7
FIG. 6 is a partial perspective view of a ground brush according to another embodiment.

The motor actuator 10 of this embodiment drives a movable damper member such as an air mix door or a mode switching door of the vehicle air conditioning system S. First, the vehicle air conditioning system S will be described.

As shown in FIG. 1, the upstream side portion of the air-conditioning casing 202 forming the air flow path arranged in the vehicle is
An inside air intake port 203 for inhaling the vehicle interior air and an intake port 204 for inhaling the outside air are formed, and
A suction port switching door 205 that selectively opens and closes these suction ports 203 and 204 is provided. The inlet switching door 205 is opened and closed by a driving means such as a servomotor or a manual operation.

A blower 207 is arranged at the downstream side of the suction port switching door 205, and the air sucked by the blower 207 from both of the suction ports 203, 204 is blown into each of blower outlets 214, 215, which will be described later. The air is blown toward 217. An evaporator 209 serving as an air cooling unit is arranged on the downstream side of the blower 207, and all the air blown by the blower 207 passes through the evaporator 209.

A heater core 210, which serves as an air heating means, is arranged on the downstream side of the evaporator 209. The heater core 210 heats the passing air by using the cooling water of the engine 211 as a heat source.

Further, a bypass passage 212 that bypasses the heater core 210 is formed in the air conditioning casing 202, and an air flow rate of the air volume passing through the heater core 210 and the air volume passing through the bypass passage 212 is formed on the upstream side of the heater core 210. An adjusting air mix door 213 is provided. The air flow rate is adjusted by adjusting the opening of the air mix door 213 by the motor actuator 10 of this example.

A face outlet 214 for blowing out conditioned air to the upper half of the passenger in the passenger compartment and a foot outlet 215 for blowing air to the feet of passengers inside the passenger compartment are provided on the most downstream side of the air conditioning casing 202. And a defroster outlet 217 for blowing air toward the inner surface of the windshield 216.

Then, the outlets 214, 215, 2
Blow-off mode switching doors 218, 219, 220 are arranged at the upstream side portions of 17, and these blow-off mode switching doors 218, 219, 220 are provided.
Are opened and closed by drive means such as a servo motor.

The vehicle air conditioning system S is controlled by an electronic control unit (ECU) 221. The electronic control unit (ECU) 221 is based on a sensor input, a switch operation input of an occupant, and the like.
8, 219, 220, and drive means such as the motor actuator 10 for driving the air mix door 213 and the like.

Next, the motor actuator 10 of this example will be described. As shown in FIG. 2, the motor actuator 10 includes a motor 20, a speed reduction mechanism 30, a terminal unit 40, and a motor case 50 that houses them.

As the motor 20, a small DC brush motor having an armature, a brush and the like inside is used. The motor 20 includes a rotary shaft 2 having a worm gear 22.
1 can be rotated in both forward and reverse directions.

For the motor actuator 10 of this embodiment, the DC brush motor as described above is suitable because of its simple drive control and low cost.
A brushless motor or the like may be used as long as it can rotate in both directions.

The reduction mechanism 30 comprises a worm wheel 31 that meshes with the worm gear 22, a spur gear 32 that meshes with the worm wheel 31, and an output gear 33 that meshes with the spur gear 32. With this configuration, the rotational driving force of the motor 20 is transmitted to the output shaft 34 of the output gear 33 via the reduction mechanism 30.

The output shaft 34 is attached to a crank arm (not shown) connected to the door of the vehicle air conditioning system S. Further, on the back surface side of the output gear 33 in the figure, a pulse pattern plate (not shown) having a pulse pattern made of a conductive material is arranged.

The terminal unit 40 includes a terminal plate 41 made of synthetic resin, a connector terminal 42 connected to the electronic control device 221, a motor power supply terminal 43, a control board 60, and a brush 48. The terminal plate 41 is a metal plate for electrical conduction, which is insert resin molded, or a metal plate for electrical conduction, which is attached to a synthetic resin plate.

The terminal unit 40 in which the connector terminal 42, the motor power supply terminal 43, the control board 60, the brush 48 and the like are integrally assembled is arranged in the motor case 50 (lower case 51) and then heat caulked. Is fixed to the motor case 50 (lower case 51). At this time, the columnar mounting portion formed on the lower case 51 is connected to the terminal unit 40.
Is inserted into a mounting hole (not shown), positioned, and heat-crimped. The columnar mounting portion also serves as a spacer, and when the terminal unit 40 is mounted on the lower case 51,
The lower case 51 and the terminal unit 40 are separated from each other by a predetermined height.

The motor case 50 comprises a lower case 51 and an upper case (not shown) made of synthetic resin, and they are integrally assembled by engaging the respective engaging portions 52.

Printed wiring is provided on the control board 60 for electrical connection. As shown in FIG. 3, an IC 61 for controlling the motor actuator 10 is arranged in the central portion of the surface of the control board 60. . Further, the control board 60 includes
A connection hole 62 is formed, and the connection end of the brush 48 is inserted into the connection hole 62 and fixed by soldering.

The connection holes 62 are connection holes 62a and 62b.
have. The position sensor brushes 47 are connected to the two connection holes 62a, and the three connection holes 62a are connected.
A brush for ground 46 is connected to b.

Further, the IC 61 has a structure in which a terminal including an empty terminal not used for control is used as a heat radiating terminal 61a and heat is radiated from the heat radiating terminal 61a. Then, on the front substrate of the heat dissipation terminal 61a, a ground pattern 60a (hatched portion) made of a conductive material is widely formed in a portion including the connection hole 62b as shown in FIG.

FIG. 4 shows an explanatory diagram of electrical connection of the IC 61. A power terminal and a signal terminal of the connector terminal 42 are connected to the IC 61, and are connected to the electronic control unit 221 by the signal terminal. Further, the IC 61 is the motor 2
Drive power supply terminal to 0 and a connection terminal with the brush 48,
It has a heat dissipation terminal 61a and the like.

The brush 48 has a position sensor brush 47 and a ground brush 46. The two position sensor brushes 47 are respectively connected to the connection holes 6 of the control board 60.
It is inserted through 2a and attached by soldering. As shown in FIG. 5, the ground brush 46 includes three connection terminals 46a, contact portions 46b with two pulse pattern plates, and an extension portion 46 for connecting these.
c, 46d. Then, the extension portions 46c and 46
A slit-shaped heat dissipation hole 46e for heat dissipation is formed in d.

FIG. 6 shows a ground brush 46 (brush 4
It is a schematic diagram which shows the attachment state of 8). The connection terminal 46 a of the ground brush 46 is inserted into the connection hole 62 b of the terminal board 41 and the control board 60 and soldered. Note that a positioning regulating portion may be provided on the back surface of the terminal plate 41 so that the brush 48 can be easily positioned.

In this example, the terminal plate 41 is provided with the brush 4
Although the holes for inserting the connecting terminals of No. 8 are formed, the terminal board 4 is formed so as not to interfere with inserting the connecting terminals of the brush 48 into the connecting holes 62 of the control board 60.
The insertion portion of 1 may be formed in a partially cut shape.

Since the ground brush 46 is constructed in this way, when the motor actuator 10 operates and the IC 61 generates heat, the heat is conducted from the heat dissipation terminal 61a to the ground pattern 60a formed on the substrate. . Since the ground pattern 60a is widely formed on the substrate, the heat generated in the IC 61 is efficiently released to the ground pattern 60a without being covered by the IC 61. At this time, a part of the heat is dissipated from the ground pattern 60a into the atmosphere inside the motor case 50.

The heat conducted to the ground pattern 60a is transferred to the ground brush 4 via the connecting terminal 46a.
6 is transmitted to the output gear 33. At this time, the ground brush 46 has the ground pattern 60.
In order to increase the area to be connected to a, the three connecting terminals 46a are connected to the ground pattern 60a. Therefore, heat can be efficiently transferred from the ground pattern 60a to the ground brush 46.

Further, since the ground brush 46 has two contact portions 46b, the extension portions 46c and 46d are formed wider than the position sensor brush 47, and the ground brush 46 is also formed. Slit-shaped heat dissipation hole 4
6e is formed, and the area in contact with the atmosphere is increased. Therefore, the ground brush 46
It is possible to efficiently dissipate heat into the atmosphere.

In the above structure, the brush 48 is attached to the control board 60 by inserting the terminal plate 41, but not limited to this, a part of the brush 48 is resin-molded on the terminal plate 41. Is also good. In this case, extension 4
6c has a low height and is molded in the terminal board 41. The extension portion 46d is molded in the terminal plate 41 from the lower end portion of the extension portion 46c to the end portion of the terminal plate 41, and the portion from the end portion of the terminal plate 41 to the connection portion with the contact portion 46b is exposed to the atmosphere. It will be composed. Then, heat is radiated from the exposed portion into the atmosphere.

Next, the operation of the motor actuator 10 will be described. From the power terminal of the connector terminal 42,
Power is supplied to the IC 61, and the electronic control unit 221
When a control signal is input to the IC 61 from the signal terminal of the connector terminal 42, a voltage is applied to the motor 20 from the IC 61 via the motor power supply terminal 43 according to the door driving direction of the control signal.

When a voltage is applied to the motor 20, the rotary shaft 21 shown in FIG. 2 rotates in a predetermined direction. When the rotary shaft 21 rotates, the worm gear 22 rotates, and the worm gear 22
Is sequentially transmitted to the worm wheel 31, the spur gear 32, and the output gear 33 to drive the entire reduction gear mechanism 30. The output shaft 34 is rotated by the rotation of the output gear 33, and the door is driven via the crank arm.

When the output gear 33 rotates, the output gear 33
When the brush 48 comes into contact with the pulse pattern plate disposed in the above, a pulse corresponding to the rotation angle of the output gear 33 is output.

The IC 61 detects the rotation angle and the rotation direction of the output gear 33 based on the pulses from the two position sensor brushes 47. As a result, the IC 61 controls the supply of the applied voltage to the motor 20 so that the output gear 33 rotates by the operation control amount based on the control signal.

As described above, according to this embodiment,
It has the following effects. (1) In the motor actuator 10 of this example, since the ground pattern 60a is formed widely on the control board 60 and in front of the plurality of heat dissipation terminals 61a of the IC 61, the heat generated in the IC 61 is generated by the heat dissipation terminal 61a. Is efficiently discharged to the ground pattern 60a via the. This is preferable because malfunction of the IC 61 is not caused by the heat.

(2) Further, the ground brush 46 of this example
Is connected to the ground pattern 60a, and the extension 46c,
Due to the large heat dissipation area of 46d,
The heat radiated to the ground pattern 60a is preferable because it is efficiently radiated from the ground pattern 60a and the ground brush 46 into the atmosphere.

Since the ground pattern 60a and the ground brush 46 are connected by the three connection terminals 46a, the contact area between the two becomes large.
This is preferable because heat conduction from the ground pattern 60a to the ground brush 46 is efficiently performed.

The embodiment of the present invention may be modified as follows. In the above embodiment, since the grounding brush 46 is formed wide and the heat radiation hole 46e is formed, the area in contact with the atmosphere is larger than that of the position sensor brush 47. This improves the heat dissipation effect, but the present invention is not limited to this, and as shown in FIGS. 7A and 7B, the structure may be provided with a heat dissipation fin 46f. By forming the plurality of heat radiation fins 46f in this manner, the area in contact with the atmosphere becomes larger and the heat radiation effect is improved, which is preferable.

When a part of the brush 48 is resin-molded on the terminal plate 41, the heat dissipation fins 46 similar to those described above are provided on the extending portion 46d extending from the end of the terminal plate 41.
It is better to provide f. Although not shown, the extended portions 46c and 46d of the brush 48 may have an uneven cross section to increase the heat dissipation area.

Further, in the above embodiment, the heat radiation fin 4 is used.
Although 6f is formed in the extension parts 46c and 46d, it is not limited to this and can be formed in the contact part 46b. In this case, the heat radiation fin 46f formed on the contact portion 46b
The heat radiation fins 46f may be formed on the side opposite to the pulse pattern plate so that the heat radiation fin 46f does not contact the pulse pattern plate.

Further, in the above embodiment, the ground brush 46 is attached to the control board 60 by three connecting terminals 46a, but not limited to this, it is attached by four or more connecting terminals 46a. It may be configured as follows. For example, the connection terminal 46a may be formed on the heat dissipation fin 46f shown in FIG. 7B. If you do this,
It is preferable because heat can be more efficiently conducted from the ground pattern 60a to the ground brush 46.

Further, in the above embodiment, the thickness of the ground brush 46 is the same as the thickness of the position sensor brush 47, but the thickness of the ground brush 46 is larger than that of the position sensor brush 47. Then, the heat capacity is increased, so that the heat generated in the IC 61 is more efficiently conducted to the ground brush 46. Further, in order to improve heat conduction, the ground brush 46 may be formed of a material having good heat conductivity.

In the above embodiment, only the grounding brush 46 is used for heat dissipation, but the position sensor brush 47 may be used for heat dissipation.

[0059]

As described above, according to the brush and the motor actuator of the present invention, the heat radiation holes and the heat radiation fins are formed for the heat generated in the control board without adding a heat sink or another separate member. It is possible to dissipate efficiently by the brush for detecting the rotation angle.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a vehicle air conditioning system.

FIG. 2 is a partial cross-sectional view of a motor actuator.

FIG. 3 is an explanatory diagram of a control board of a motor actuator.

FIG. 4 is an electrical configuration diagram of a motor actuator.

FIG. 5 is a perspective view of a ground brush.

FIG. 6 is a schematic diagram showing a mounting state of a brush.

FIG. 7 is a partial perspective view of a ground brush according to another embodiment.

[Explanation of symbols]

10 motor actuator, 20 motor, 21 rotating shaft, 22 worm gear, 30 reduction mechanism, 31 worm wheel, 32 spur gear, 33 output gear, 34
Output shaft, 40 terminal unit, 41 terminal plate, 42
Connector terminal, 43 Motor power supply terminal, 46 Ground brush, 46a connection terminal, 46b contact part, 46
c, 46d extension, 46e heat dissipation hole, 46f heat dissipation fin, 47 position sensor brush, 48 brush,
50 motor case, 51 lower case, 52 engaging part,
60 control board, 60a ground pattern, 61 I
C, 61a Heat dissipation terminal, 62 Connection hole, 62a, 62
b connection hole, 202 air conditioning casing, 203, 20
4 intake port, 205 intake port switching door, 207 blower, 209 evaporator, 210 heater core, 211 engine, 212 bypass passage, 213 air mix door, 214 face outlet, 215 foot outlet, 216 windshield, 217 defroster outlet 218, 219, 220 Air outlet mode switching door,
221 Electronic control unit, S Vehicle air conditioning system

Claims (5)

[Claims] 1. A brush connected to an electronic circuit board, wherein at least one of a heat dissipation hole or a heat dissipation fin for increasing a heat dissipation area is provided. 2. A motor actuator comprising: a rotation angle detection pattern plate; a brush slidably contacting the pattern plate; and an electronic circuit board for controlling the drive of a motor, wherein the brush is connected to the electronic circuit board. At the same time, the brush is provided with at least one of a heat dissipation hole or a heat dissipation fin for increasing a heat dissipation area. 3. The electronic circuit board includes an electronic circuit component, and a conductive ground pattern for heat dissipation connected to a predetermined terminal of the electronic circuit component is formed on the electronic circuit substrate, and the brush is The motor actuator according to claim 2, wherein the motor actuator is connected to the ground pattern. 4. The motor actuator according to claim 2, wherein the brush is at least one of a position sensor brush and a ground brush. 5. The motor actuator according to claim 2, wherein the motor actuator is used as a damper driving unit of a vehicle air conditioning system.