JPH072261Y2 - Motor actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Use of the Invention) The present invention relates to a motor actuator, and in particular, a drive device such as an air mix door, a blower motor, a compressor, an inside / outside air switching door, and a mode switching door in a vehicle air conditioner. The present invention relates to a motor actuator in which hysteresis is provided.

(Prior Art) Conventionally, in an air conditioner for a vehicle, it is desired to mix an inside / outside air switching door, a compressor for sending a refrigerant of a cooler unit, a cool air dehumidified by a cooler unit and a warm air by a heater unit at an arbitrary ratio. It is equipped with various drive devices such as an air mix door for controlling the temperature of the air and a switching door for switching between vent mode, bi-level mode, foot mode and defrost mode.

Such a vehicle air conditioner will be schematically described with reference to FIG.

This vehicle air conditioner is equipped with a duct 1,
An inside / outside air switching door 4 is provided between the inside air inlet 2 and the outside air inlet 3 on the upstream side of the duct 1, and opening / closing of the inside / outside air switching door 4 is controlled by the first motor actuator 5. Air from the inside air introduction port 2 or the outside air introduction port 3 is introduced into the duct 1 by the blower 6, and the evaporator 7 of the cooler unit, the air mix door 8, the heater core 9 of the heater unit, are sequentially provided on the downstream side of the blower 6. Mode switching doors 10 and 11 are provided.

The evaporator 7 includes a compressor 12, a condenser 13,
The liquid receiver 14 and the expansion valve 15 constitute a refrigeration cycle, and the compressor 12 includes an engine pulley.
The rotational force from 16 is transmitted via the magnet clutch 17.

The air mix door 8 adjusts the mixing ratio of the cool air from the evaporator 7 and the warm air from the heater core 9, and is controlled by the second motor actuator 18. The water cock 19 is opened and closed in conjunction with the opening and closing of the air mix door 8 to adjust the heating amount of the heater core 9.

The mode switching doors 10 and 11 adjust the direction and amount of air blown from the face outlet 20, the foot outlet 21, and the defrost outlet 22. It is controlled by the motor actuator 23.

Further, the control unit 24 includes the first motor actuator 5 and the second motor actuator 1 as described above.
8, a third motor actuator 23, a blower motor 6a for driving the blower 6, and a magnet clutch 17 are controlled, and the blower control circuit 25, the compressor control circuit 26, the mode switching door control circuit 27, and the inside / outside air switching door 4 It has a control circuit 28 and an air mix door control circuit 29. Furthermore, in this control unit 24,
Cooling switch 30, temperature setting device 31, air volume setting device 32, blowout mode setting device 33, inside / outside air switching mode setting device 34, automatic control setting switch 35, outside air temperature sensor 36, inside air temperature sensor 37, evaporator temperature sensor 38, etc. The signal from is input.

However, according to such a vehicle air conditioner, the circuit configuration becomes complicated because various control circuits including the blower control circuit 25 as an electric circuit are required, and these control circuits are composed of semiconductor elements. In this case, there is a problem that a malfunction may occur due to thermal influence, external noise, or the like.

In order to solve such a problem, as disclosed in JP-A-58-20969, the motor actuator of the air mix door 8 which is directly related to the temperature in the vehicle is used as a control reference, that is, this air is used. It has been proposed that a movable contact that interlocks with the mix door 8 and a fixed contact that faces the movable contact constitute a switch mechanism, and that output signals of the switch mechanism control other drive devices.

The movable contact is adapted to be interlocked with the air mix door 8. Depending on the rotation angle of the air mix door 8, that is, the state of the air blown to the downstream side after the heater core 9 is from full heat to full cool. Hysteresis is provided in each drive device according to the change in state,
There is also a disclosure of Japanese Patent Application No. 61-92522 by the present applicant in which hunting is prevented and feeling is improved by this hysteresis.

As a preferable temperature control that the occupant actually feels, it is better to perform temperature control as quickly as possible in the cooling state and not feel frequent temperature control in the heating state. In addition, depending on the position and shape of the blowout port, or other characteristics, it is often preferable to change the above-mentioned hysteresis depending on the state depending on various air conditioners.

(Object of the Invention) Therefore, the present invention controls other drive devices such as a blower motor according to the rotation angle of the output shaft of the electric motor for driving the drive device such as the air mix door, that is, according to the opening degree of the air mix door. It is possible to set the hysteresis on the output shaft, and by changing the size of the hysteresis according to the rotational position of the output shaft, it is possible to prevent hunting and change the hysteresis according to the feeling, making it more comfortable. An object is to provide a motor actuator that can be used as an air conditioner.

(Means for Solving the Problems) That is, the present invention relates to a motor actuator having a contact fixture to which the movable contact is attached and a printed circuit board having a fixed contact with which the movable contact comes in contact with and separates from each other.
A hysteresis setting tool is provided so as to face the contact mounting tool, and an engaging claw and an engaging groove that can be engaged with each other are formed at a predetermined interval between both members, and the engaging claw and the engaging groove are inclined. By forming a surface and providing cam means for changing the relative positions of the engaging claw and the engaging groove in accordance with the rotation angle of the output shaft, a full-heat state and a full-cool state are provided in accordance with the rotation angle. The motor actuator is characterized in that the hysteresis can be changed appropriately during the period.

(Embodiment) Next, one embodiment of the present invention will be described with reference to FIGS. 2 to 8 by taking as an example the case of being applied to the motor actuator 18 of the air mix door 8. However, the same parts as those in FIG. 1 are designated by the same reference numerals, and the detailed description thereof will be omitted.

FIG. 2 shows the motor actuator 40 according to the present embodiment (first
(Equivalent to the second motor actuator 18 in the figure), which is a longitudinal sectional view of the motor actuator 40, which has an upper case 41 and a lower case 42, and is rotatably forward and reversely rotated by a bearing 43. Is supported.

The output shaft 44 is connected to the air mix door 8, and the air mix door 8 depends on the rotation angle of the output shaft 44.
Opens and closes from a full heat state (phantom line in FIG. 1) to a full cool state (solid line in FIG. 1).

An output gear 45 is integrally provided on the lower portion of the output shaft 44, and the output gear 45 receives the driving force from the electric motor 46 via an appropriate driving force transmission mechanism 47 such as a gear transmission mechanism, It is transmitted to the output shaft 44.

A printed circuit board 48 is fixed to the upper case 41 and the lower case 42 above the output gear 45, and a conductive pattern of fixed contacts 49 as shown in FIG. 3 is formed on the surface of the printed circuit board 48. I am doing it. The fixed contacts 49 are, for example, a fixed contact group 49a for controlling the blower motor 6a, a fixed contact group 49b for controlling the second motor actuator 23 of the mode switching doors 10 and 11, and a fixed contact group 4 for controlling the compressor 12.
9c, and a fixed contact group 49d for a stopper circuit for cutting off the input of the electric motor 46 and preventing its burnout when the air mix door 8 is in a full heat state or a full cool state.

A resistance pattern of the contact 50 of the potentiometer for detecting the position of the air mix door 8 is formed on the back surface of the printed circuit board 48.

A movable contact 51 that contacts the contact 50 is provided on the front surface side of the output gear 45, and a movable contact 52 that contacts and separates from the fixed contact 49 is provided on the rear surface side of the contact fitting 53. This fixed contact 49
And a movable contact 52 form a switch mechanism, and the blower motor 6a, the compressor 12, the inside / outside air switching door 4, the mode switching door 10, other than the air mix door 8, are rotated by the forward / reverse rotation of the output shaft 44. It is designed to control the driving of other driving equipment such as 11.

The contact fitting 53 is rotatably supported by a movable contact 52 provided on the rear surface of the upper case 41 so as to come into contact with a protrusion 54 formed on the inner surface of the upper case 41.

A hysteresis setting tool 56 is provided between the contact fitting 53 and the boss 55 of the upper case 41, and the hysteresis setting tool 56 is moved to the second position by a push spring 57 interposed between the contact mounting tool 53 and the boss 55 of the upper case 41. It is biased upward in the figure and abuts on the boss 55.

The portion of the hysteresis setting tool 56 will be described with reference to FIG. FIG. 4 is an exploded perspective view of the output gear 45, the printed circuit board 48, the contact fitting 53, and the hysteresis setting tool 56, which engage with a pair of keyways 58 formed in the axial direction of the output gear 45. Set the pair of keys 59 to the hysteresis setting tool.
Formed in the central hole of 56. Therefore, the hysteresis setting tool 56 is configured to rotate integrally with the output shaft 44 by the engagement of the key groove 58 and the key 59.

The contact fitting is coaxial with the hysteresis setting tool 56.
53 is loosely fitted to the output shaft 44. This hysteresis setting tool
An engaging claw 60 is formed on the lower outer surface of the 56 so as to project therefrom.
An engaging groove 61 capable of engaging with 60 is formed in the contact fitting 53.

Details of the engaged state of the engaging claws 60 and the engaging grooves 61 are shown in FIGS. 5 and 6. FIG. 5 is a plan view showing the engagement state between the engagement claw 60 and the engagement groove 61, and FIG. 6 is a longitudinal sectional view showing the engagement state. And engaging groove 61
The engagement groove 61 is formed to be larger so that a predetermined space 62 is provided therebetween (FIG. 5). Further, the engaging claw 60 is formed with an inclined surface 63 (FIG. 6) in the longitudinal direction thereof, and the output shaft 44
Due to the difference in the relative position of the engaging claw 60 and the engaging groove 61 in the length direction, the size of the interval 62 until the engaging claw 60 abuts and engages with the inner wall of the engaging groove 61 becomes different. ing.

Further, as shown in FIGS. 5 and 7, a pair of cam surfaces 64 formed by connecting portions having a difference in height between the upper and lower sides is provided on the upper surface of the hysteresis setting tool 56. Further, a cam surface 65 of the same shape that can be engaged with the cam surface 64 is formed on a portion of the inner surface of the upper case 41 facing the boss 55 (FIG. 7). Therefore, in a normal state, the cam surfaces 64 and 65 are engaged with each other over their entire surfaces to stabilize the state shown in FIG. 2. For example, the state shown in FIG. Indicates a cool state.

Next, the operation of the above configuration will be described with reference to FIG.

FIG. 8 shows the drive control state of the blower motor 6a of the blower 6 among the various drive devices. When the air mix door 8 is in the full cool state, the cam surface 64 of the hysteresis setting tool 56, and Cam surface 65 of upper case 41
Is completely engaged as shown in FIG. 2, the engaging claw 60 is deeply engaged with the engaging groove 61 as shown in FIG.
The distance 62 between the engaging claw 60 and the engaging groove 61 is in the minimum state.

In this state, when the electric motor 46 is driven to change the opening degree of the air mix door 8 and the output shaft 44 is rotated via the driving force transmission mechanism 47, the rotational driving force from the output shaft 44 is set to hysteresis. When the engaging claw 60 and the engaging groove 61 are in the engaged state, the electric power is transmitted to the contact fitting 53, and the contact fitting 53 rotates by a predetermined angle. Therefore, the movable contact 52 of the contact fixture 53 slides while being connected to the fixed contact 49 of the printed circuit board 48, and the blower motor 6a of the fixed contact 49 follows the conductive pattern of the fixed contact group 49a for controlling the blower motor 6a. Drive level is high (Hi)
Changes from state to medium state.

However, since a gap 62 of a predetermined size is provided between the engagement claw 60 of the hysteresis setting tool 56 and the engagement groove 61 of the contact attachment tool 53, the hysteresis setting tool 56 of the hysteresis setting tool 56 accompanying the rotation of the output shaft 44 is provided. For rotation, this interval 62 minutes only the contact fitting 53
Does not follow, and therefore the contact fitting 53 does not rotate and the movable contact 52 does not move on the fixed contact 49 despite the rotation of the output shaft 44 or the hysteresis setting tool 56. Therefore, as shown in FIG. A hysteresis having such a dead zone region S1 will be drawn.

In the same manner as described above, the output shaft 44 repeats normal and reverse rotations at any time during the transition from the medium state to the low (Lo) state and while returning to the high state and becoming the full heat state. We will draw a hysteresis with S1, S2, S3, S4.

Then, when the hysteresis setting tool 56 rotates due to the rotation of the output shaft 44, the cam surface 64 is formed on the upper surface of the hysteresis setting tool 56, so that it repels the cam surface 65 of the boss 55 of the upper case 41. The hysteresis setting tool 56 moves downward in FIG. 2 against the urging force of the pushing spring 57 from below.
Therefore, the hysteresis setting tool 56 engagement claw 60 also descends with it, and the interval 62 between the engagement claw 60 and the engagement groove 61 of the contact attachment 53 gradually increases.

That is, due to the separation of the cam surfaces 64, 65 due to the rotation of the hysteresis setting tool 56, the hysteresis setting tool 56
The state of the contact fitting 53 that does not follow the rotation of No. 2 continues for a long time, and the dead band regions S2 to S4 of each hysteresis shown in FIG. 8 gradually expand toward the dead band region S4.

As a result, as the air mix door 8 shifts from the full-cool state to the full-heat state, the dead zone of the hysteresis is expanded. Therefore, not only hunting is prevented by providing the hysteresis, but also the width of the hysteresis can be made variable according to the state of the air mix door 8. It is possible to provide an air conditioner that is more comfortable and comfortable between the conventional state and the full heat state.

The hysteresis setting tool 56, the engaging claw 60 and the engaging groove 61 formed on the contact mounting tool 53 are the hysteresis setting tool 56.
Alternatively, it goes without saying that it may be formed on any member of the contact fitting 53, and the shape of the engaging claws 60 may be various shapes according to the required characteristics and scale of the air conditioner equipped on the vehicle. Can be formed.

For example, as shown in FIG. 9, (a) shows the inclined surface 63 described in the present embodiment, and (b) shows that the inclined surface 63 has a direction opposite to that of the present embodiment among those having one direction. Showing things. Further, (c) shows a triangular shape with a center protruding, (d) shows a center protruding in an arc shape, and (e) shows a center having a trapezoidal recess. , (F) show a concave portion having a circular arc shape at the center. Of course, it is needless to say that the shapes of the cam surfaces 64 and 65 must be appropriately designed according to the selection of the engaging claws 60.

Further, the inclined surface may be formed on either one of the engaging claw or the engaging groove, or both of them.

Further, the case where the cam means such as the cam surfaces 64 and 65 is formed in the hysteresis setting tool 56 has been described, but it may be formed in the contact fitting 53.

Although the case of drive control of the blower 6 has been described in FIG. 8 as an example, it goes without saying that the present invention can be applied to control of various other drive devices.

(Effects) As described above, according to the present invention, the engaging claw and the engaging groove, and the cam that can change the distance between the hysteresis setting tool and the contact mounting tool. Since the means is provided, the width of the hysteresis changes according to the rotation angle of the output shaft of the air mix door, etc., and the air mix door, blower, compressor, inside / outside air switching door, mode in the vehicle air conditioner Since the hysteresis of driving equipment such as switching doors can be changed according to the rotation angle of the output shaft, not only hunting can be prevented but also the hysteresis can be changed according to the passenger's feeling, and a more comfortable air condition than before. It can be a harmony device.

[Brief description of drawings]

FIG. 1 is a schematic view of a general vehicle air conditioner, FIG. 2 is a longitudinal sectional view of an essential part of an embodiment of the present invention, and FIG. 3 is a plan view of a fixed contact 49 of a printed circuit board 48. 4 is an exploded perspective view of relevant parts of the contact fitting 53 and the hysteresis setting tool 56, FIG. 5 is an enlarged cross-sectional view of relevant parts of the engaging claw 60 and engaging groove 61, and FIG. FIG. 7 is a longitudinal sectional view of the main parts of the engaging claw 60 and the engaging groove 61, and FIG. 7 is a partial sectional side view of the cam surface 64 of the engaging claw 60 and the cam surface 65 of the upper case 41. FIG. 8 is a characteristic diagram including hysteresis of the blower motor 6a, and FIG. 9 is a side view showing another example of the inclined surface of the engaging claw. 1 ... Duct 2 ... Inside air inlet 3 ... Outside air inlet 4 ... Inside / outside air switching door 5 ... First motor actuator 6 ... Blower 6a ... Blower motor 7 ... Evaporator 8 ... Air mix door 9 Heater core 10, 11 Mode switching door 12 Compressor 13 Capacitor 14 Liquid receiver 15 Expansion valve 16 Engine pulley 17 Magnet clutch 18 Second motor actuator 19 … Water cock 20 …… Face outlet 21 …… Foot outlet 22 …… Defrost outlet 23 …… Third motor actuator 24 …… Control unit 25 …… Blower control circuit 26 …… Compressor control circuit 27 …… Mode switching door control circuit 28 …… Inside / outside air switching door control circuit 29 …… Air mix door control circuit 30 …… Cooling switch 31 …… Temperature setter 32 …… Wind Volume setter 33 …… Blowout mode setter 34 …… Inside / outside air switching mode setter 35 …… Automatic control setting switch 36 …… Outside air temperature sensor 37 …… Inside air temperature sensor 38 …… Evaporator temperature sensor 40 …… Motor actuator 41 …… upper case 42 …… lower case 43 …… bearing 44 …… output shaft 45 …… output gear 46 …… electric motor 47 …… driving force transmission mechanism 48 …… printed circuit board 49 …… fixed contact 50 …… contact 51, 52 ...... Movable contact 53 ...... Contact mounting tool 54 ...... Ridge 55 ...... Boss 56 ...... Hysteresis setting tool 57 ...... Push spring 58 ...... Key groove 59 ...... Key 60 ...... Engaging claw 61 ... … Engagement groove 62 …… Spacing 63 …… Inclined surface 64, 65 …… Cam surface S1, S2, S3, S4… Dead zone

Claims (1)

[Scope of utility model registration request] 1. An electric motor, an output shaft that rotates by receiving a driving force of the electric motor, a contact fixture that interlocks with the output shaft, and a fixed contact that a movable contact attached to the contact fixture separates from and contacts. And a printed circuit board having: a hysteresis setting tool provided to face the contact fitting, and the hysteresis setting tool and the contact fitting are provided at a predetermined interval. The engaging claws and the engaging grooves with inclined surfaces that can be engaged with each other, and the relative positions of the engaging claws and the engaging grooves in the axial direction of the output shaft are determined according to the rotation angle of the output shaft. A motor actuator provided with a cam means for changing.