JP2566348Y2 - 2-axis electric actuator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-axis electric actuator capable of accurately assembling a driven shaft to an output shaft.

[0002]

2. Description of the Related Art Various doors such as intake doors, air mix doors and air distribution doors of recent air conditioners for automobiles, and lock mechanisms for automobile doors are operated by electric actuators.

Conventionally, as such an actuator, there is a single-shaft actuator having one output shaft (Japanese Utility Model Laid-Open No. 2-96064 and Japanese Utility Model Laid-Open No. 3-40856). In such a case, two driven members may be driven very close to each other, and a two-axis actuator having two output shafts has also been developed from the viewpoint of reducing space (Japanese Patent Application Laid-Open No. HEI 9-163442). 6
0-98068).

FIGS. 3 and 4 show an example of such a two-axis actuator. One example of the driven side is a door of an air conditioner, which has a solid first driven shaft 1 and a cylindrical second driven shaft 2 arranged concentrically therewith. . A door (not shown) and a door 3 are integrally formed on the first driven shaft 1 and the second driven shaft 2, respectively. The first and second driven shafts 1 and 2 are arranged concentrically with the two output shafts of the actuator, that is, the first output shaft 4, corresponding to the fact that they are coaxial. The second output shaft 5 is provided. In addition, these first
The upper ends of the first and second output shafts 4 and 5 are formed in a cylindrical shape or a cross-sectional D shape, respectively, and the lower ends of the first and second driven shafts 1 and 2 are press-fitted and fixed to each other. .

In order to drive the first output shaft 4, a semicircular gear 6 is formed integrally with the first output shaft 4, and three gears 7, 8, A first reduction gear train composed of a gear 9 and a gear (not shown) is meshed with the gear 9, and a worm 11 of an output shaft of a motor 10 is meshed with the gear 9. Thereby, the rotation output of the motor 10 is
The speed is reduced and transmitted to the gear 6, the first output shaft 4 is rotated, and the first driven shaft 1 is driven. On the other hand, in the configuration for driving the second output shaft 5, similarly, the semicircular gear 12 is integrally formed on the second output shaft 5, and the three gears 13, 1
A second reduction gear train composed of gears 4, 15 and a gear not shown is meshed with the gear 12, and a worm 17 on the output shaft of the motor 16 meshes with the gear 17. Thus, when the motor 16 is driven, the second output shaft 5 is rotated at a reduced speed, the second driven shaft 2 is driven, and the door 3 is rotated.

[0006]

However, in such a conventional two-axis actuator, as shown in FIG. 4, the upper ends of the first and second output shafts 4 and 5 are respectively formed in a cylindrical shape. The first and second driven shafts 1,
The lower ends of the two are press-fitted and fixed. Therefore, when the first driven shaft 1 is press-fitted into the first output shaft 4, the state of the first driven shaft 1 is blocked by the second driven shaft 2 and cannot be visually observed. Is difficult.

[0007] The present invention has been made in view of such problems of the prior art, and has as its object to provide a two-axis electric actuator that can accurately assemble a driven shaft to an output shaft. I do.

[0008]

According to the present invention, a first output shaft and a second output shaft concentric with the first output shaft are concentric with the first driven shaft of the driven unit. While being arranged coaxially with the second driven shaft, the rotation output of the first motor is transmitted to the first output shaft via the first reduction gear train, and is also transmitted to the second output shaft. In a two-shaft electric actuator in which the rotation output of a second motor is transmitted via a second reduction gear train, the first and second output shafts and the first and second driven shafts are different from each other. Are fixed to each other on the outside on different sides of the case.

[0009]

According to the present invention, the first and second output shafts and the first and second driven shafts are fixed to each other on the outside on different planes. In addition, when the first driven shaft is fixed, the second driven shaft is not obstructed by the second driven shaft and cannot be visually observed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1A is a plan view of a two-axis electric actuator according to an embodiment of the present invention, FIG. 1B is a side sectional view thereof, and FIG. 2 is a sectional view taken along line CC of FIG. 1A. It is.
3 and 4 are denoted by the same reference numerals.

The two-axis electric actuator according to the present embodiment is applicable to an electric actuator that operates various doors of an air conditioner for a vehicle or a lock mechanism of a door of a vehicle.

This electric actuator is housed in a long case 20, as shown in FIGS. The output shaft thereof, that is, the first output shaft 21 and the second output shaft 22 concentric with the first output shaft 21 are arranged near the end of the case 20. Accordingly, when driving the driven shaft of the door 3 provided at the corner of the air conditioner unit, the actuators themselves can be aligned with each other without protruding outside the air conditioner unit. In such a case, the size can be reduced.

The first and second output shafts 21, 22
As shown in FIG. 2, is disposed coaxially with the first driven shaft 1 of the driven unit and the cylindrical second driven shaft 2 concentric with the first driven shaft.

The first output shaft 21 is formed in a cylindrical shape from a resin, and is disposed so as to protrude from one surface of the case 20. A screw hole 23 is formed in the protruding portion. The first driven shaft 1 is fitted in the cylindrical first output shaft 21, and the first output shaft 21 is fixed to the first driven shaft 1 by screws 24 inserted into screw holes 23. .

The second output shaft 22 is formed of resin and is slidably disposed with respect to the first output shaft 21. The upper end 25 of the second output shaft 22 protrudes from the case 20 to a side different from the first output shaft 21, is formed in a cylindrical shape, and has a screw hole 26. This cylindrical upper end 25
The second output shaft 22 is fixed to the second driven shaft 2 by a screw 27 inserted into a screw hole 26.

As described above, since the first and second output shafts 21 and 22 and the first and second driven shafts 1 and 2 are fixed by the screws 24 and 27, they are fixed by press fitting as in the related art. When the first driven shaft 1 is fixed, the first driven shaft 1 is not obstructed by the second driven shaft 2 and cannot be visually observed. Further, since the fixing is performed by the screws 24 and 27, it is not necessary to employ a detent structure between the output shafts 21 and 22 and the driven shafts 1 and 2, and the number of processing steps can be reduced. Furthermore, since the fixing is not performed by press-fitting, the possibility that the output shaft side is broken is reduced, and the possibility that rattling occurs is also reduced. Furthermore, screw holes 2 on the output shaft side
By setting the values of 3, 26 to be large, it is possible to perform fine adjustment for absorbing manufacturing variations of the actuator and the driven unit.

As shown in FIG. 1B, the first output shaft 21 is configured to be driven by a first motor 31 via a first reduction gear train 33, and the second output shaft 22 is It is configured to be driven by the second motor 32 via the reduction gear train 34.

The first and second reduction gear trains 33, 34
Is configured as follows. The first motor 31 has a worm 35 on the output shaft.
, The large gear 37 of the double spur gear 36 is meshed.
A small gear 38 of the double spur gear 36 is meshed with a large gear 40 of a double spur gear 39, and a small gear 41 thereof is meshed with a large gear 43 of a double spur gear 42, and a small gear 44 thereof.
And a semicircular spur gear 45 integrally formed with the first output shaft 21 is meshed with the first output shaft 21. Thereby, the first motor 31
Is reduced by the first reduction gear train 33 and transmitted to the first output shaft 21.

The second reduction gear train 34 is also a first reduction gear train 33.
The worm 46, the output shaft of the second motor, the double spur gear 47 composed of the large gear 48 and the small gear 49, the double spur gear 50 composed of the large gear 51 and the small gear 52, It is composed of a double spur gear 53 composed of a gear 54 and a small gear 55, and a semicircular spur gear 56 formed integrally with the second output shaft 22.
As a result, the rotation output of the second motor 32
The speed is reduced by the reduction gear train 34 and transmitted to the second output shaft 22.

Further, the first and second reduction gear trains 33,
The surfaces of the gears 34 in the axial direction are arranged so as to face each other. The double spur gears 36 and 47 are supported by one shaft 57 and the double spur gears 39 and 50
Are supported by one shaft 58, and the double spur gears 42 and 53 are also supported by one shaft 59. 1A and FIG. 3B and FIG.
As is apparent from comparison with the above, there is no useless space for the gear train, and the actuator can be made more compact.

As described above, according to this embodiment, there is no useless space for the gear train, and the actuator can be made more compact. For example, when the driven shaft of the door provided at the corner of the air conditioner unit is driven as the driven side, the actuator itself can be aligned with the air conditioner unit. Compactness can be achieved.

Further, since the first and second output shafts and the first and second driven shafts are fixed on different surfaces,
When the first driven shaft is fixed, the first driven shaft is not obstructed by the second driven shaft and cannot be seen, so that there is no improper assembly, and the assembly can be performed accurately.

Further, since the fixing is performed by screws, it is not necessary to employ a detent structure between the output shaft and the driven shaft, so that the number of processing steps can be reduced. Furthermore, since the fixing is not performed by press-fitting, the possibility that the output shaft side is broken is reduced, and the possibility that rattling occurs is also reduced.
Further, by making the screw holes on the output shaft side large, it is possible to make fine adjustments to absorb manufacturing variations of the actuator and the driven unit.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified.

[0025]

As described above, according to the present invention, the driven shaft can be accurately assembled to the output shaft.

[Brief description of the drawings]

FIG. 1A is a plan view of a two-axis electric actuator according to an embodiment of the present invention, and FIG. 1B is a side sectional view thereof.

FIG. 2 is a sectional view taken along line CC of FIG.

FIG. 3 is a plan view of a conventional two-axis electric actuator.

FIG. 4 is a sectional view taken along line EE in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st driven shaft 2 ... 2nd driven shaft 20 ... Case 21 ... 1st output shaft 22 ... 2nd output shaft 31 ... 1st motor 32 ... 2nd motor 33 ... 1st reduction gear train 34 ... 2nd Reduction gear train

Claims (1)

(57) [Scope of request for utility model registration] 1. A first output shaft (21) and a second output shaft concentric with the first output shaft (21).
(22) are arranged coaxially with the first driven shaft (1) of the driven unit and the second driven shaft (2) concentric with the first driven shaft (1), while the first output shaft (1) 21), the rotational output of the first motor (31) is transmitted via the first reduction gear train (33), and the rotational output of the second motor (32) is transmitted to the second output shaft (22). 2 transmitted through a reduction gear train (34)
In the shaft-type electric actuator, the first and second output shafts (21, 22) and the first and second driven shafts (1, 2) are mutually reciprocally located on different surfaces of the case (20). A two-axis electric actuator, wherein the electric actuator is fixed to the actuator.