JPH11113219A - Motor with worm gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impact force applied in the thrust direction of an output plate and wear of internal parts of a motor with time in a motor having a speed and a worm gear with a built-in position sensor used in a power window device of an automobile. This solves the problem that the sensor cannot detect the rotation speed and position of the output plate with high accuracy because the pattern plate and the rotary plate are affected by the inclination and shake of the output plate due to the above. SOLUTION: By providing a buffer member formed by a spring material 4 and a preload spring 5 between an output plate 3 and a pattern plate 6 or a rotating plate 6a, it is possible to reduce the impact force applied in the thrust direction of the output plate. A worm gear with a built-in highly reliable sensor because the sensor can accurately detect the rotational speed and position of the output plate 3 by absorbing the influence of the output plate falling or swaying due to wear of the motor internal parts that occur over time. A motor is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor with a worm gear used for a power window device for opening and closing a window glass of an automobile.

[0002]

2. Description of the Related Art In recent years, in order to avoid the danger of shutting down while holding a human body in place, a power window device of an automobile is forcibly applied even when an operation switch requires closing a window under certain conditions. A system for opening a window by reversing a motor has been increasingly used. For this reason, a motor with a worm gear used in a power window device has been required to incorporate a sensor for knowing the rotation speed of the motor and the position of the glass. In response to such demands, various types of motors with built-in worm gears having sensors have been proposed and used.

A conventional motor with a built-in sensor worm gear will be described below with reference to the drawings.

FIG. 5 shows an example of a conventional motor with a built-in worm gear. In FIG. 5, reference numeral 1 denotes a worm gear formed at the end of an armature shaft rotatably supported by a bearing A (not shown) provided on a motor frame (not shown). A worm wheel 2 meshes with the worm gear 1 and transmits the motor torque while reducing the torque. Reference numeral 3 denotes an output plate in which the convex portion 31 and the output shaft 32 are integrally formed, and the convex portion 31 is engaged with the concave portion 21 of the worm wheel to connect with the worm wheel to form the output shaft 32 that is integrally formed. Transmits torque. Reference numeral 6 denotes a pattern plate which has a flat portion on which a predetermined pattern is formed by a conductor and an electrical insulator, is connected to the output plate 3 by a pattern plate holder 8, and rotates together. Reference numeral 7 denotes a contact that slides on the flat surface of the pattern plate 6 and detects the number of rotations and the rotation position of the output shaft. Reference numeral 91 denotes a bearing B that rotatably supports the output plate. 9 is a gear case for storing and holding these parts.

FIG. 6 shows another example of a conventional motor with a built-in sensor and worm gear. 6 is different from FIG. 5 in that a rotating plate 6a having claw portions 61a as switch driving means instead of the pattern plate 6 is
Further, a switch means 7a driven by a claw portion 61a is used instead of the contact 7. The other parts are the same as those in FIG.

[0006]

However, in the above-mentioned conventional configuration, since the pattern plate and the rotary plate are directly connected to the output plate, the impact force applied in the thrust direction of the output plate of the motor and the motor generated over time. Since the pattern plate and the rotary plate are affected by the inclination and runout of the output plate due to the wear of the internal parts, there is a problem that the sensor cannot accurately detect the rotation speed and the position of the output plate.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a motor with a worm gear incorporating a highly reliable sensor.

[0008]

According to a first aspect of the present invention, there is provided a worm gear motor having a structure in which a buffer member is provided between a pattern plate and an output plate. Further, the worm gear motor according to claim 2 of the present invention has a configuration in which a buffer member is provided between the rotary plate and the output plate.

With this structure, the impact member applied in the thrust direction of the output plate of the motor or the effect of the output plate falling or oscillating due to wear of the motor internal parts caused with time is absorbed by the buffer member. Since the sensor can accurately detect the rotational speed and position of the worm gear, a worm gear motor incorporating a highly reliable sensor can be obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides an armature shaft rotatably supported by a bearing A provided on a motor frame, a worm gear formed at the tip of the armature shaft, A worm wheel meshed with the worm gear to transmit a motor torque; an output plate connected to the worm wheel to transmit torque to an output shaft; and a bearing B rotatably supporting the worm wheel and the output plate. A gear case accommodating them, a pattern plate having a flat portion formed with a predetermined pattern of a conductor and an electrical insulator, connected to the output plate and rotating together, and being slidably contactable with the pattern plate. Worm gear equipped with a contact held by the gear case, the output plate and the pattern plate via a buffer member It is obtained by sintering.

According to a second aspect of the present invention, there is provided an armature shaft rotatably supported by a bearing A provided on a motor frame, a worm gear formed at the end of the armature shaft, and a toothed gear on the worm gear. A worm wheel to which the motor torque is transmitted in combination, an output plate connected to the worm wheel for transmitting torque to an output shaft, a bearing B for rotatably supporting the worm wheel and the output plate, and a housing for accommodating them. A motor with a worm gear, comprising: a gear case, a rotating plate having a switch driving unit at a predetermined position and connected to the output plate and rotating together, and switch means driven by a claw of the rotating plate. The output plate and the rotary plate are connected via a buffer member, and both the pattern plate or the rotary plate and the output plate Since the structure has a cushioning member between them, the impact of the impact force applied in the thrust direction of the motor's output plate and the overturning and runout of the output plate due to the wear of the motor's internal parts that occur over time are buffered. Since the member absorbs the rotation, the rotation speed and the position of the output plate can be accurately detected by the sensor.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of a gear portion of a motor with a worm gear showing one embodiment of the present invention, and FIG. 2 is a perspective view of an output plate, a preload spring, a spring material, a pattern plate, and a contact of the motor. FIG.

1 and 2, reference numeral 1 denotes a worm gear formed at the end of an armature shaft rotatably supported by a bearing A (not shown) provided on a motor frame (not shown). A worm wheel 2 meshes with the worm gear 1 and transmits the motor torque while reducing the torque. Reference numeral 3 denotes an output plate in which a convex portion 31 having a hollow inside and an output shaft 32 are integrally formed,
The projection 31 is engaged with the recess 21 of the worm wheel to transmit torque to an output shaft 32 integrally formed with the worm wheel. 4 is a leg 41 having a spring property
And a claw portion 42 protruding in a direction opposite to the leg portion 41, and is elastically connected to the output plate by the leg portion 41 and at the same time holds the pattern plate 6 by the claw portion 42. 5 is disposed between the output plate 3 and the spring member 4 so that the output plate 3
A pressurizing force in the thrust direction is generated between the pressure plate and the pattern plate 6. Reference numeral 6 denotes a pattern plate having a flat portion on which a predetermined pattern is formed by a conductor and an electrical insulator, and a notch portion 61 with which the claw portion 42 of the output plate engages on the inner diameter portion. Reference numeral 7 denotes a contact that slides on the flat portion of the pattern plate 6 and detects the number of rotations and the rotation position of the output shaft as an electric pulse. Reference numeral 91 denotes a bearing B that rotatably supports the output plate. 9 is a gear case for storing and holding these parts.

With the above construction, the output plate and the pattern plate are connected by the cushioning material. Therefore, even if a dimensional change occurs due to an external impact or wear of parts, the output plate and the pattern plate are connected. The rotation speed and the position can always be detected with high precision without occurrence of backlash between the two.

(Embodiment 2) FIG. 3 is a sectional view of a gear portion of a motor with a worm gear showing another embodiment of the present invention, and FIG. 4 is an output plate, a preload spring, a spring material, a rotary plate, and switch means of the motor. It is a perspective view of.

3 and FIG. 4 are different from FIG. 1 and FIG. 2 in that a rotary plate 6a having a claw 61a as a switch driving means in place of the pattern plate 6, and a claw 61a in place of the contactor 7. Switch means 7 driven by
a is used. The other parts are the same as those in FIGS. 1 and 3, and thus are denoted by the same reference numerals and description thereof is omitted.

[0018]

As described above, according to the present invention, the impact member applied to the output plate of the motor in the thrust direction and the effect of the output plate falling or swaying due to the wear of the motor internal parts caused with time are buffered. , A motor with a worm gear incorporating a highly reliable sensor capable of accurately detecting the rotation speed and position of the output plate can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a motor with a worm gear according to an embodiment of the present invention.

FIG. 2 is a perspective view of the main components.

FIG. 3 is a sectional view of a motor with a worm gear according to another embodiment of the present invention.

FIG. 4 is a perspective view of the main components.

FIG. 5 is a sectional view of a conventional motor with a worm gear.

FIG. 6 is a sectional view of another conventional motor with a worm gear.

[Explanation of symbols]

 Reference Signs List 1 worm gear 2 worm wheel 3 output plate 31 recess 32 output shaft 4 spring material 41 leg 42, 61a claw 5 preload spring 6 pattern plate 6a rotary plate 7 contact 7a switch means 8 pattern plate holder 8a rotary plate holder 9 gear case 91 Bearing B

Continued on the front page (72) Inventor Michihiro Shimizu 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. An armature shaft rotatably supported by a bearing A provided on a motor frame, a worm gear formed at the end of the armature shaft, and a motor torque transmitted by meshing with the worm gear. A worm wheel, an output plate connected to the worm wheel for transmitting torque to an output shaft, a bearing B for rotatably supporting the worm wheel and the output plate, a gear case for accommodating the worm wheel, and a conductor and electrical insulation. A pattern plate having a flat portion formed with a predetermined pattern on the body and connected to the output plate and rotating together; and a contact held by the gear case so as to be able to slide on the pattern plate. A motor with a worm gear, wherein the output plate and the pattern plate are connected via a buffer member. Motor with gear. 2. An armature shaft rotatably supported by a bearing A provided on a motor frame, a worm gear formed at an end of the armature shaft, and a motor torque transmitted by meshing with the worm gear. A worm wheel, an output plate connected to the worm wheel for transmitting torque to an output shaft, a bearing B for rotatably supporting the worm wheel and the output plate and a gear case for housing them, and a switch in a predetermined position. A motor with a worm gear, comprising: a rotating plate having a driving unit and rotating together with the output plate, and a switch driven by a claw of the rotating plate, wherein the output plate, the rotating plate, Is a motor with a worm gear, which is connected via a buffer member.