JPH0229816Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric drive device equipped with a group of reduction gears, and particularly relates to a motor drive device having a structure capable of driving a driven device by manual operation. It is something.

[Background of the idea]

This type of motor drive mechanism is used, for example, as a drive means for retractable head lamps for automobiles, and is operated by operating the motor in normal times, but in the unlikely event that the motor cannot be operated for some reason, it is operated manually. It has the function of being able to

As a motor drive mechanism having a simple structure and the above functions, a configuration as shown in FIG. 4 (hereinafter referred to as a draft plan) can be considered.

1 is a drive mechanism housing, and 2 is a lid.

FIG. 5 is a plan view with the lid 2 removed.

Next, the above proposal will be explained with reference to FIGS. 4 and 5.

(See FIG. 5) A drive motor 3 drives a worm gear 4 and a worm wheel 5.

(See FIG. 4) The worm wheel 5 is slidably fitted onto the manual operation shaft 6. A handle 6a is fixed to the manual operation shaft 6, and is rotatably supported by the housing 1 and the lid 2.

A second stage reduction gear 7 is fixed to the manual operation shaft 6a. The worm foil 5 and the second
It is connected to the stage reduction gear 7 via a spring clutch 8.

(See FIGS. 4 and 5) Reference numeral 9 denotes a second-stage reduction gear, which is integrally connected to the third-stage reduction gear 10. 11 is a third stage reduction gear.

(See FIG. 5) The third stage reduction gear 11 reciprocates the rack 13 via the eccentric shaft 12, and reciprocates the pinion 14 and output shaft 15.

In the above-mentioned draft motor drive device, when the motor 3 is rotated to drive the worm wheel 5, the worm wheel 5 is connected to the spring clutch 8.
The second stage reduction gear 7 is rotated through the second
The output shaft 15 is driven via the stage and third stage reduction gears.

If the motor 3 cannot be operated for some reason, the second-stage reduction gear 7 is manually rotated in the forward rotation direction using the manual operation shaft 6 via the handle 6a. In the present invention, the normal rotation direction of the reduction gear refers to the rotation direction during normal operation.

The spring clutch 8 has a directionality that transmits the rotation of the worm wheel 5 in the forward direction to the second stage reduction gear 7, but does not transmit the rotational force in the reverse direction.

The normal rotation of the second stage reduction gear 7 causes the second stage reduction gear 9 and subsequent stages to rotate in the normal direction. At this time, since the spring clutch 8 does not transmit rotation to the worm wheel 5, the worm wheel 5, worm gear 4, and motor 3 are not rotated. Therefore, even if the motor 3 is seized, for example, the second stage reduction receiving gear 9 and subsequent stages can be rotated in the normal direction by manual operation.

As a characteristic of the worm transmission mechanism, in general, even if you try to turn the worm gear 4 by turning the worm wheel 5, the worm gear 4 will not turn.However, as mentioned above, the spring clutch 8 cuts off the transmission, so manual operation is possible regardless of the worm gear 4 and the worm wheel 5. can do.

However, the above-mentioned tentative device (Figs. 4 and 5)
, if the handle 6a is turned in the reverse direction by mistake, the spring clutch 8 will move against the worm wheel 5.
The handle 6a has a strong tactile feel because it is tightly wrapped around the handle 6a for transmission purposes. If an erroneous operator turns the handle 6a in the reverse direction with even greater force, there is a risk that one of the transmission members will be damaged.

[Purpose of invention]

This idea was created in view of the above circumstances.
The present invention aims to improve the manually operable motor drive mechanism of the above-mentioned proposal to provide a motor drive mechanism that does not cause damage to the transmission member even when the handle is turned in the opposite direction.

[Summary of the idea]

In order to achieve the above object, the drive mechanism of the present invention includes a motor that rotates in a fixed direction, a multi-stage reduction gear group, a receiving gear of an arbitrary reduction stage in the reduction gear group, and a receiving gear of an arbitrary reduction stage among the reduction gear group. In a motor drive device in which the base gear of the next stage is configured separately and connected via a spring clutch, and a manual operation shaft is attached to the base gear, the receiving gear of the arbitrary reduction stage and the base gear of the above-mentioned A master gear of the next stage configured separately from the gear, and a manual operation shaft rotatably fitted to and supporting the received gear and the master gear are provided, and A first spring clutch is provided for transmitting rotational force to the next stage primary gear, and a second spring clutch is provided for transmitting rotational force in the normal rotation direction from the manual operating shaft to the next stage primary gear.

[Example of idea]

Next, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

This embodiment is based on the above-mentioned prototype device (Figs. 4 and 5).
This is an example of an improvement made by applying the present invention to Fig.

FIG. 1 is a partial cross-sectional view of this example, and corresponds to FIG. 4 in the above-mentioned draft plan, and members with the same drawing reference numbers as in FIG. 4 are the same or similar structural members as in the above-mentioned draft plan. It is.

The difference from the above-mentioned prototype is that in the prototype, the second stage reduction gear 7 was fixed to the manual operation shaft 6, whereas in this example, the second stage reduction gear 7' is fixed to the manual operation shaft 6. 6', and the second stage reduction gear 7' and manual operation shaft 6' are connected via a second spring clutch 16.

FIG. 2 shows an enlarged sectional view of the manual operating shaft 6' and related members, and FIG. 3 shows an exploded perspective view of the same.

A worm wheel 5 and a second stage reduction gear 7' are slidably fitted onto the manual operation shaft 6', and both gears are connected via a spring clutch 8.

This spring clutch 8 is a component similar to that in the above-mentioned prototype, but is referred to as a first spring clutch in this example.

A spring clutch seat 17 is externally fitted and fixed to the manual operation shaft 6', and a second spring clutch 16 is interposed between the spring clutch seat 17 and the second stage reduction gear 7'. The directionality of the second spring clutch 16 is such that it performs a transmission function in the direction of forward rotation of the second stage reduction receiving gear 7' by the manual operation shaft, and blocks rotation in the reverse direction.

18 is a waterproof cap.

In the motor drive mechanism configured as described above (see Fig. 2), when the motor is operated and the worm wheel 5 is rotated in the normal direction via the worm gear 4, the worm wheel 5 is rotated in the normal direction via the first spring clutch 8 to the second stage reduction gear. 7' is rotated forward, and the second stage reduction receiving gear 9
The subsequent transmission members are caused to rotate normally. At this time,
The second spring clutch 16 is connected to the manually operated shaft 6'
Do not transmit force in the forward rotation direction to the

If the motor cannot be operated for some reason, turning the manual operating shaft 6' in the normal rotation direction via the handle 6a will cause the second spring clutch 1 to rotate.
6, the second stage reduction gear 7' and subsequent transmission members are driven in the normal rotation direction. At this time, the first spring clutch 8 rotates idly without transmitting rotation.

If the operator accidentally turns the handle 6a in the opposite direction, the second spring clutch 16 will slip and there will be no response, and the manual operation shaft 6' and spring clutch seat 17 will simply spin idly, causing other problems. The transmission member does not move. Therefore, the handle 6 due to incorrect operation
There is no risk of damaging the internal mechanism due to the reverse rotation of a.

[Effect of idea]

As detailed above, according to the motor drive mechanism of the present invention, it is possible to quickly manually operate a driven device by rotating the handle in the forward direction, and even if the handle is rotated in the reverse direction by mistake, the power transmission still remains. This has an excellent practical effect in that there is no risk of damaging the members.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention,
FIG. 1 is a partial sectional view, FIG. 2 is a sectional view of a manually operated portion, and FIG. 3 is an exploded perspective view. FIG. 4 is a partial sectional view of the trial device, and FIG. 5 is a plan view of the trial device with the lid removed. 1... Drive mechanism housing, 2... Lid, 3...
...Drive motor, 4...Worm gear, 5...Worm wheel, 6, 6'...Manual operation shaft, 7,
7'... Second stage reduction gear, 8... First spring clutch, 16... Second spring clutch, 17... Spring clutch seat.

Claims (1)

[Claims for Utility Model Registration] A motor that rotates in a certain direction and a multi-stage reduction gear group, a receiving gear of an arbitrary reduction stage in the reduction gear group, and a master gear of the next stage of the above-mentioned arbitrary stage. In a motor drive device in which a manual operation shaft is attached to the main gear and a manual operation shaft is attached to the main gear, a receiving gear of an arbitrary reduction gear and a receiving gear are separately configured from the receiving gear. A manual operation shaft is provided that rotatably fits and supports the received gear and the original gear, and transfers the rotational force of the received gear in the normal rotation direction to the next stage source gear. A first spring clutch that transmits power to the gear, and a second spring clutch that transmits rotational force in the normal rotation direction from the manual operation shaft to the next primary gear. Motor drive mechanism.