JPH0452099Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention is a method for controlling air volume and
The present invention relates to a drive device for a wind direction control dial.

Conventional configuration and its problems Conventionally, the air volume used in vehicle air conditioners,
As shown in Figure 1, the wind direction post-mortem damper (hereinafter referred to as a damper) consists of a mixture damper 1 that adjusts the temperature by the mixing ratio of cold air and warm air, and mode dampers 2 and 3 that set the air intake and blowout style. ,4,
Consisting of 5. Since the mix damper 1 sets the temperature arbitrarily, it is necessary to set the position arbitrarily, and the mode dampers 2, 3, 4, and 5 can be set in stages according to the number of intake and blowout modes. is necessary. Normally, these dampers are driven by manually operating a lever through a wire or the like by connecting dampers 1, 2, 3, 4, and 5 with a link system. However, such manual operation cannot support car automatic air conditioners, which have more advanced comfort performance than automatic temperature adjustment and mode setting. Therefore, an actuator is required to automatically open and close each damper.

In recent years, many motor actuators 6 using DC motors have been proposed as actuators for these automatic air conditioners. Referring to FIG. 2, a conventional example of this motor actuator will be described to explain its configuration and problems.

Fig. 2 shows a conventional motor actuator for an automatic air conditioner with output shaft rotation position control type, in which 7 is a driving motor, 8 is a first worm for driving, 9 is a first worm wheel, and 10 is a motor actuator for an automatic air conditioner. The second worm, 11 is the output worm foil, 12 is the output shaft,
13 is a contact piece, 14 is a rotational position control member, 15 is a case, 16 is an output arm, and 17 is a lead wire. In this motor actuator, the rotational force of the motor 7 is transmitted to the output worm wheel 11 at the final stage through each gear train, and the desired rotational force is applied to the output arm 16 via the output shaft 12. In this configuration, movement of the output arm 16 is applied to each damper shown in FIG. 1 by a connecting rod (not shown). Typically, the motion of each damper has a certain rotation angle and direction. In addition, as mentioned above, in the mix damper 1, since it is necessary to set the temperature arbitrarily, it is necessary to set the damper at an arbitrary operating position. Since it becomes necessary to set the operating position in stages, the output shaft 12 in Fig.
The necessary conditions for this operation are: (a) rotation angle, (b) rotational direction, (c) arbitrary movement, and (d) stepwise movement. Generally, in order to obtain each of the above-mentioned operations, the output worm foil 1 shown in FIG.
A contact piece 13 is provided on the case 15, and the contact piece 13 rotates in a predetermined pattern and comes into contact with the rotation position control member 14, which is fixed to the case 15, thereby performing electrical ON-OFF operation. The operation is controlled by an electric control section (not shown) via a lead wire 17.

Normally, a limiter is provided on the contact surface of the rotational position control member with the contact piece 13 for each of the above operations A, B, and D, and a position detection resistor is provided for the above C operation. A printing method has been proposed.

However, in the motor actuator of the above type, the contact piece 13 and the rotational position control member 1
The contact conditions with 4 were extremely severe, resulting in low reliability of output shaft rotational control.

There are the following two factors that can be cited as factors that reduce the reliability described above.

a Due to harsh environmental conditions, gear system lubricant evaporates and adheres to the rotational position control member, resulting in poor electrical insulation, poor continuity, and changes in the resistance value of the resistor.

b Conductive and insulating wear powder, chips, and dust generated from the drive motor 7, first drive worm 8, and first worm foil 9, which have relatively high rotational speeds, enter the rotational position control section. This causes poor electrical insulation, poor continuity, and tears in the contact piece 13 and the rotational position control member 14.

As described above, the motor actuator for the auto air conditioner described above still has many problems in terms of reliability, which has been a factor hindering its practical application.

Purpose of the invention In view of the above drawbacks, the present invention provides a motor actuator for an automatic air conditioner that has an extremely simple structure and is highly reliable.

Structure of the Invention The present invention includes a motor, a first worm fixed to the motor, a first worm wheel that engages with the first worm and to which the rotational force of the motor is transmitted, and the first worm wheel. a second worm disposed on the same axis, an output worm wheel that engages with and rotates the second worm, an output shaft fixed to the output worm wheel, the motor, the first worm wheel, and the A case that supports a second worm and the output shaft, a contact piece provided on the output worm foil, and a rotational position control unit provided on the output shaft and fixed inside the case. In addition, since the space in which the motor is located, the space in which the first worm and the first worm wheel are located, and the space in which the rotational position control section is located are each partitioned by a wall inside the case, the rotational position cannot be changed. The reliability of the control unit has been improved depending on the environmental conditions.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows a plan view of a mechanical part and a front sectional view of a main part of a motor actuator for driving a damper in a vehicle air conditioner according to a first embodiment of the present invention.

In FIG. 3, 18 is a drive motor, 19 is a first worm for driving, 20 is a first worm wheel,
21 is a second worm, 22 is an output worm foil, 23 is an output shaft, 24 is a contact piece, 25 is a rotational position control member, 26 is a case, 27 is an output arm,
28 indicates a lead wire, and 29 indicates a partition wall.

In the embodiment, the rotational force of the motor is transmitted from the first driving worm 19 fixed to the driving motor 18 to the first worm wheel 20, and from the second worm 21 provided coaxially to the output wheel 2.
2. Since the output shaft 23 is fixed to the output wheel 22, a predetermined rotational force is generated on the output shaft, and the output arm 27 fixed to the output shaft rotates. When the motor actuator according to this embodiment is used in an actual vehicle air conditioner, the movement of the output arm 27 is applied to each damper shown in FIG. 1 through a linkage mechanism (not shown). It's summery. Furthermore, the partition wall 29 is located inside the case 26, and includes a space C that supports the drive motor 18, a space D where the first drive worm 19, and the first worm wheel 20 that engages therewith are located. , the contact piece 24, and the rotational position control member 25 are each partitioned into a space E in which they are located. Further, the partition wall 29 also serves as a reinforcing rib for the case 26.

Therefore, in the motor actuator according to the present invention, during operation, a significant amount of damage occurs in the spaces C and D where the drive motor 18, the first drive worm 19, and the first worm wheel 20 that engages therewith are located. Harmful electrically conductive and insulating wear particles, chips, dust, etc. of the motor, worm, and worm wheel, as well as evaporation and scattering of gear lubricant generated under particularly high-temperature environmental conditions, are generated in spaces C and D, respectively. Since the harmful substances are sealed in the rotary position control section, the harmful substances do not get mixed in or adhere to the rotation position control section, and the structure is extremely simple.
Compared to the past, a motor actuator with significantly higher reliability can be supplied at a lower cost, and its practical effects are significant.

Effects of the invention As described above, according to the invention, a highly reliable motor actuator can be obtained with a simple configuration.

[Brief explanation of the drawing]

Figure 1 is a system configuration diagram of a vehicle air conditioner, Figures 2A and B are a plan view and front sectional view of a conventional output shaft rotation control type motor actuator, and Figures 3A and B are sectional views of main parts. FIG. 1 is a plan sectional view and a front sectional view of a motor actuator in a first embodiment of the present invention. 18... Drive motor, 19... First drive worm, 20... First worm wheel, 21...
Second worm, 22...Output worm foil, 2
3... Output shaft, 24... Contact piece, 25... Rotation position control member, 26... Case, 27... Output arm, 28... Lead wire, 29... Partition wall.

Claims (1)

[Scope of utility model registration request] a motor, a first worm fixed to the motor, a first worm wheel that engages with the first worm and to which rotational force of the motor is transmitted, and a first worm wheel that is disposed on the same axis as the first worm wheel. a second worm, an output worm wheel that engages with and rotates the second worm, an output shaft fixed to the output worm wheel, the motor, the first worm wheel, the second worm, and the output. a case supporting the shaft; a contact piece provided on the output worm foil; and a contact piece provided on the output shaft;
and a rotational position control unit fixed inside the case, and a space in which the motor is located, a space in which the first worm and the first worm wheel are located, and a space in which the rotational position control unit is located. The motor actuator for the damper drive device is separated by walls inside the case.