JPS59139515A - Contact structure for motor drive device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to various parts of automobiles, scooters, etc., such as a retractable headlamp drive part, a rearview mirror wiper drive part, and a windshield wiper drive part.

The present invention relates to a contact structure of a motor drive device installed in a headlamp wiper drive unit, a rear window wiper drive unit, and the like.

This type of motor drive device generally includes a reduction gear mechanism that is rotationally driven by a motor, a mechanism that converts rotational motion into reciprocating motion, a printed circuit board that constitutes a control circuit for the motor, and a motor startup.

A contact mechanism for controlling the stop is housed in the housing, and the contact mechanism has a plate with a contact pattern formed on the back surface of the final reduction gear (the surface facing the housing) and is in contact with the plate. A structure is used in which contact terminals are fixed and supported by a housing, and these contact terminals are soldered to a printed circuit board via a harness.

FIG. 1 is a plan view of a wiper drive device as an example of a motor drive device, with the lid of the housing 1 removed.

The rotation of the motor 2 is controlled by the worm gear 3. Warm boil 4. The power is transmitted to the final reduction gear 6 via the secondary gear 5, and this final reduction gear 6 is transmitted via the eccentric cam 7 to the rack 8.
The wiper shaft 10 rotatably mounted on the pinion 9 is rotated reciprocally.

11 is a printed circuit board that constitutes the control circuit of the motor;
Relay 12. It is equipped with electrical components such as a diode 13.

A contact mechanism is provided to control the motor 1 to stop at a predetermined position.

In FIG. 1, the contact mechanism described above is hidden. 14 represented by a hidden line is a contact terminal in the form of a leaf spring.

A contact plate that slides into contact with the contact terminal 14 to establish conduction is fixed to the back surface of the final reduction gear 6.

FIG. 2 is a back view of the final reduction gear 6, to which a plate 15 (hatched for ease of reading) on which a conductive contact pattern is formed is fixed, and this plate 1
The tip of the contact terminal 14 in the form of a leaf spring is in sliding contact with the contact terminal 5.

In the contact mechanism for motor drive as described above, it is quite difficult to incorporate a plurality of contact terminals 14 into the narrow space between the final reduction gear 6 and the housing 1. 6 and the plate 15 to reduce the size and weight of the entire device.

As a mounting member for the above contact terminal 14, conventional
As shown in the figure, a structure is used in which a machine screw 18 is used and a washer-like terminal plate 19 is used to solder the harness to the printed circuit board 11, but (1) the number of components is large; There is a limit to reducing the width of the contact terminal, and (lii) the number of assembly steps is large. As a result, the device cannot be made smaller and lighter, resulting in higher costs.

The present invention has been made in view of the above circumstances, and it is possible to significantly reduce the width of a leaf spring-shaped contact terminal and make it linear.
Moreover, the purpose is to provide a contact structure that is easy to assemble. By reducing the width of the contact terminals, it is possible to increase the number of contact terminals installed and shorten the installation pitch of the contact terminals.

It is possible to downsize the contact plate and other parts, and as a result, it is naturally expected that the entire device will be downsized, lightweight, and cost reduced.

In order to achieve the above object, the contact structure of the motor drive device of the present invention includes a reduction gear mechanism that is rotationally driven by the motor, a mechanism that converts rotational motion into reciprocating motion, and a printed circuit board that constitutes the control circuit of the motor. In a contact structure for a motor drive device in which a contact mechanism for controlling the start and stop of the motor is housed in a housing, a plate with a contact pattern formed on the back side of the final reduction gear is fixed to the back surface of the final reduction gear, and A plate spring or wire spring shaped contact terminal is fitted into the groove provided, and the top of the contact terminal is pressed down with a printed circuit board to fix the contact terminal and to make the contact terminal conductive to the printed circuit board. Features.

Next, an embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. 4 is a plan view of one embodiment of the contact structure of the present invention, and FIG. 5 is a partially sectional side view of the housing 1. Final reduction gear 6. The plate 15 on which the contact pattern is formed is the same or similar component as in the conventional device.

The contact terminal 16 is a member corresponding to the contact terminal 14 in the conventional device, but its width is reduced compared to the conventional device, and it is configured to have a shape closer to a wire spring than a plate spring shape.

The contact terminal 16 has one end 16a formed into a shape suitable for contacting and conducting with the plate 15, and
The other end 16b is formed into a shape suitable for contacting and conducting with the conductive portion 11a of the printed circuit board 11.

A block 17 for attaching a contact terminal is provided on the bottom of the housing 1, and a contact terminal is attached to this block 17]4
Grooves 17a and 17b having a width to fit with the grooves 17a and 17b are formed.

Fit the contact terminals 16 into the grooves 17a and 17b, and press the printed circuit board 11 over them,
The printed circuit board conductive portion 11a is brought into contact with the other end portion 16b of the contact terminal 16. The printed circuit board 11 has a fixing means (
(not shown) is fixed to the bottom surface of the housing 1.

The contact terminal 16 having spring elasticity is pressed against the printed circuit board 11 and is slightly elastically deformed, and its elastic restoring force brings it into close contact with the printed circuit board conduction portion 11a and conducts it.

The contact structure configured as described above does not require any parts such as machine screws or washers, so there are fewer components, and reliable conduction can be obtained without soldering the contact terminals, so the number of assembly steps is reduced. It's over.

Furthermore, since there is no need to provide a screw hole for attachment, the contact terminal 16 can be configured as a thin spring rod in the shape of a wire spring, and the installation pitch dimension P can be reduced. Therefore, by reducing the diameters of the plate 15 and the final reduction gear 6, the entire device can be made smaller and lighter.

As described in detail above, according to the present invention, the width of the contact terminal and its installation pitch can be significantly reduced, and furthermore, the device can be assembled easily and quickly in a narrow space. It greatly contributes to overall compactness, weight reduction, and cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the motor drive device, FIG. 2 is a back view of an example of a contact portion of the motor drive device, and FIG. 3 is a side sectional view of the same. Figures 4 and 5 show one of the contact mechanisms of the present invention.
An example is shown, with FIG. 4 being a plan view and FIG. 5 being a side view. DESCRIPTION OF SYMBOLS 1...Housing, 2...Motor, 6...Final reduction gear, 11...Printed circuit board, 14...Contact terminal, ]5...Plate with contact pattern formed, 16... Contact terminal, 17...Block, 1
7a, 17b... Grooves for fitting contact terminals. Patent Applicant: Ichikoh Industries Co., Ltd. Agent: Patent Attorney Masami Akimoto Figure 1 Condolences 24; Figure 3

Claims (1)

[Claims] The housing houses a reduction gear mechanism that is rotationally driven by the motor, a mechanism that converts rotational motion into reciprocating motion, a printed circuit board that constitutes the motor control circuit, and a contact mechanism that controls the start and stop of the motor. In a motor drive device, a plate with a contact pattern formed on it is fixed to the back of the final reduction gear, a spring rod-shaped contact terminal is fitted into a groove provided in the housing, and the top of the contact terminal is printed. A contact structure for a motor drive device, characterized in that the contact terminal is fixed by being pressed by a circuit board, and the contact terminal is brought into contact with a printed circuit board for electrical conduction.