JPS6334970Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a drive device for an air volume/air direction control plate (hereinafter referred to as a damper) used in a car heater that constitutes a car air conditioner.

Conventional structure and its problems Conventionally, dampers used in car heaters are
As shown in Fig. 1, it is composed of a mix damper 1 for adjusting the temperature by the mixing ratio of cold air and warm air, and mode dampers 2, 3, 4, and 5 for setting the air intake/blowing style. The mixing damper 1 needs to be set at an arbitrary position in order to adjust the mixing ratio of the cold air blown out from the cooler evaporator 7 and the warm air blown out from the heater core 8. The 2, 3, 4, and 5 mode dampers require stepwise position setting according to the number of settings for suction and blowout modes.

Normally, these dampers are driven to open and close by connecting each of dampers 2, 3, 4, and 5 with a lever link mechanism for the mode damper, and opening and closing them by manual lever operation via a wire or the like.
However, such manual operation requires temperature adjustment,
It is not compatible with car automatic air conditioners that provide a higher level of comfort by automatically setting the intake and blowout styles. Therefore, an actuator is required to automatically open and close each damper.

Conventionally, as a damper drive actuator for this automatic air conditioner, the Mitsu Damper 1 was used.
includes a diaphragm type servo actuator 9 that uses negative pressure air, mode dampers 2, 3, 4,
5, it was customary to install diaphragm actuators 10, 11, 12, and 13, which also utilize negative pressure, corresponding to each drive shaft. Another method is to individually install a motor actuator (not shown) with a built-in deceleration mechanism corresponding to each drive shaft of mix damper 1 and mode dampers 2, 3, 4, and 5. It was getting worse. However, in the above configuration, a considerable number of actuators are required depending on the damper drive shaft, and therefore a large installation space and drive space are required. In addition, in the case of a negative pressure type, piping systems such as a solenoid valve 14 and a vacuum tank 15 are required to control the negative pressure actuator, and when these are included, the weight becomes considerable, which becomes a factor that hinders the reduction in weight and size of cars. was.

OBJECT OF THE DEVICE The present invention has been made in consideration of the above-mentioned drawbacks, and aims to provide a damper drive device that is compact, lightweight, and highly accurate in drive devices for each damper in a mixed mode.

Composition of the invention The present invention includes a drive source consisting of an electric motor, a plurality of output shafts, a reduction gear mechanism that transmits the driving force to the output shafts, and a
A planetary gear mechanism consisting of an inner sun gear, a planet gear, and an outer sun gear, a steel ball is used for the connection between the inner sun gear rotational main shaft and the outer sun gear rotational main shaft, and a second worm that supports the planetary gear and an outer sun gear are used. It consists of an output shaft switching mechanism consisting of a switching lever that selectively stops the rotation of a third worm integrated with a gear,
A single drive motor can provide a plurality of damper drive output shafts, and the structure of the drive actuator is simplified, resulting in a significant reduction in the number of parts, smaller size, lighter weight, and higher precision.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a plan cross section of the drive actuator in the first embodiment of the present invention.

In FIG. 2, 16 is a drive motor which is a drive source, 17 is a first worm integrated with the motor shaft, 18 is a first worm wheel that comes into contact with the first worm, 19 is a second worm, and 20 is a second worm. and the third worm on the coaxial center, respectively 21,
It is in contact with the second and third worm wheels of No. 22. 23 is integrally engaged with the first worm wheel 18 and is a rotation axis of the second worm 19. Further, the rotating shaft 23 is integrally engaged with an inner sun gear 24. 25 and 26 are the bearings of the second worm of 19.
Although it is rotatable in the radial direction on the rotational main shaft of No. 3, it is supported so as not to move in the axial direction. First worm wheel 18 and inner sun gear 24
is integrally connected to the rotating main shaft 23.

One end of the third worm 20 is provided with 27 external sun gears constituting an output shaft switching mechanism.
It meshes with planetary gears 8 and 29. 1st above,
A deceleration transmission mechanism is constituted by the second and third worms, worm wheels, and a planetary gear device consisting of 24, 27, 28, and 29. Furthermore, 30 is axis 2
A bearing 31 is a bearing of the second worm 19 and is held within a rib 33 that is integrated with the housing 32. Similarly, 34 and 35 are bearings for the third worm. Similarly, 36 is a bearing which receives an axial thrust load transmitted from an intermediate ball 37. 1
As shown in FIG. 3, planetary gears 28 and 29 are attached to the end face of the second worm 9, and a number of concave notches 38a are provided on the outer periphery of the end face. Further, as shown in FIG. 4, a large number of concave notches 38b are provided on the outer periphery of the end surface 27 of the 20 third worms, corresponding to the 38a. Reference numeral 39 denotes an output shaft switching lever, which includes a concave notch 38a on the outer periphery of the end face of the second worm supporting the planetary gear of the planetary gear device and a concave notch 3 provided on the outer periphery of the end face of the outer sun gear 27.
8b and stop its rotation. 40 is a solenoid that drives the switching lever 39. The worm whose rotation is not stopped by the switching lever 39 is rotated by the driving force transmitted from the inner sun gear 24. 57 is a spring for returning the solenoid.
41 and 42 are rotation shafts of the second and third worm wheels, which are output shafts that drive the link mechanism. FIG. 5 is a schematic cross-sectional view of the drive actuator constructed as described above. 43 is an upper housing that engages with the housing 32.

The operation of the damper drive actuator configured as described above will be explained below.

In FIG. 2, when the drive motor 16 and the solenoid 40 are energized, the first worm 17 rotates the rotating shaft 23 that is integrally engaged with the first worm wheel 18 .

The switching lever 39 is activated by energizing the solenoid 40.
enters the outer peripheral notch 38a of the outer sun gear 27 and stops the rotation of the third worm 20. As the shaft 23 rotates, the inner sun gear 24 coaxially and integrally engaged rotates, and the second worm 19 rotates via the planetary gears 28 and 29. This causes the second worm wheel 21 to rotate, and one output shaft 42 to rotate. The third worm 20 is stationary. At this time,
Although a thrust load is applied in the axial direction of the shaft 23 due to the load of the output shaft 42, the frictional load on the bearing is reduced by the action of the intermediate ball 37.

Next, when the solenoid 40 is de-energized, the switching lever 39 is moved to the end face notch 3 of the second worm 19.
8b and stops the rotation of the second worm 19.
As a result, the outer sun gear 27 rotates via the planetary gears 28 and 29, the third worm 20 integrated with the outer sun gear 27 rotates, and the other output shaft 41 rotates.

The second worm 19 is kept stationary by the switching lever, but the shaft 23 integrated with the inner sun gear 24
rotates and transmits driving force to the outer sun gear 27.
At this time, due to the load on the output shaft 41, the third worm 2
Thrust load is applied in the rotation direction of 0. The third worm 20 rotational friction force due to the thrust load is the shaft 23
Although it fluctuates greatly depending on the direction of rotation, this fluctuation and the frictional force are reduced by the action of the intermediate ball 37.

Further, as mentioned above, the output shaft switching lever 39
By the ON/OFF operation of the solenoid 40, it enters one of the concave notch 38a on the outer periphery of the end face of the second worm 19 and the concave notch 38b also provided on the outer periphery of the end face of the outer sun gear 27, and stops its rotation. At this time, since the concave notches are very close to each other, they follow the solenoid's operation extremely quickly, so the accuracy of the operation and stopping of the output shaft that rotates when it comes into contact with the second and third worms is significantly improved. We are prepared.

Effects of the invention As described above, it is possible to selectively operate multiple output shafts with high precision using a single drive source, and by connecting this output shaft, mix damper shaft, and mode damper shaft with a link mechanism, etc. Compared to conventional damper actuators for automobiles, the structure is simpler, smaller, lighter, and more precise, and the number of parts can be significantly reduced, which has great practical effects.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a system using a damper drive device using a conventional negative pressure actuator, Fig. 2 is a sectional view of a drive actuator in an embodiment of the present invention, and Figs. A front view of each end face of the worm, and FIG. 5 is a sectional view of the drive actuator. 16... Drive motor, 41, 42... Output shaft,
17... First worm, 18... First worm wheel, 19... Second worm, 24... Inner sun gear, 23... Rotating shaft, 28, 29... Planet gear, 27... Outer sun gear, 20...Third worm, 21...Second worm wheel, 22...Third worm wheel, 37...Steel ball, 39...Switching lever, 40...Solenoid, 38a...Concave notch, 38b... Concave notch.

Claims (1)

[Scope of utility model registration request] It is composed of a drive source such as an electric motor, a plurality of output shafts, a mechanism that transmits the driving force generated from the drive source to the output shaft, and an output shaft switching mechanism that selects the output shaft, and the output shaft switching mechanism is an inner sun gear. , a second worm having a planetary gear mechanism including a planetary gear, an external sun gear, etc., and supporting the planetary gear;
A third worm that is integrated with the outer sun gear and a switching lever that selectively stops rotation of the second and third worms, respectively, the switching lever being locked on the outer periphery of the end face of the second and third worms. An automotive damper drive actuator with many concave notches.