JPH0255548A - wire drive device - Google Patents

Abstract

PURPOSE:To prevent a wire from being twisted, to improve the driving performance of the wire and to attenuate vibration and noise along with the driving by forming the section of the wire and the opening of a rotation-proof means for passing the wire, in non-circular shapes. CONSTITUTION:In a rotor shaft 9, a screw type flexible-wire 13 is inserted and fitted in a female screw section 12. The cross-section of the wire 13 is of a non-circular shape. Guides 14, 15 arranged on both the sides of a driving motor 1 serve also as rotation-proof means, and have non-circular openings corresponding to the shape of the cross-section of the wire 13. As a result, even if the wire 13 receives a rotational force with the driving motor 1, the wire 13 is prevented from rotating, and so the wire is prevented from being twisted in the wire guides 14, 15 and from being moved in the axial direction.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a power source for a vehicle that requires opening and closing of windows and doors of various parts of an automobile, including a skylight commonly known as a sunroof, and other drives. The present invention relates to a wire drive device that can be used as a power source that can be applied to houses, other buildings, and mechanical equipment in general.

[Conventional technology]

2. Description of the Related Art Wire drive devices are conventionally known that directly convert the rotation of a drive motor capable of forward and reverse rotation into reciprocating motion of a wire, and use this wire to directly push and pull a window glass to open and close it.

In this drive device, a screw-type flexible wire is passed through a hollow rotor shaft of a drive motor that can rotate forward and backward, and the wire is inserted into a female thread provided on the inner peripheral surface of the rotor shaft. They are screwed together, a wire is led outside the drive motor to the window side by a wire guide, and the tip of this wire is connected to the window glass. In this conventional device, the screw-type wire has a circular cross section in the direction perpendicular to its axis, and the wire guide through which the wire is inserted to guide its reciprocating motion has an opening. A metal cylindrical tube with a circular cross section was used.

In such a wire drive device, when the drive motor is operated to rotate the rotor shaft, the wire can be moved in the axial direction due to the engagement between the female screw portion and the screw type wire. Therefore, by rotating the drive motor in the forward direction, the wire can be used to push the window glass down, and by rotating the drive motor in the reverse direction, the window glass can be pulled down, thereby automatically opening and closing the window.

[Problem to be solved by the invention]

By the way, as mentioned above, such a wire drive device reciprocates the wire in the axial direction by changing the engagement between the screw-type wire and the rotating internal thread, so it is difficult to convert the movement. Accordingly, a rotational force is applied to the wire.

However, in the conventional configuration, no measures are taken to prevent the rotation of the wire, which has a circular cross section.
The wire is twisted and moved axially within the wire guide. Therefore, there was a problem in that a part of the power of the drive motor was used to twist the wire, and the driving force could not be efficiently transmitted to the wire, reducing the performance of the wire drive device. Second, there was a problem in that large vibrations and noise were generated due to the twisting of the wire within the wire guide.

An object of the present invention is to obtain a wire drive device that can improve wire drive performance and reduce vibration and noise associated with drive.

[Means to solve the problem]

In order to achieve the above object, in the wire drive device of the present invention, a screw type wire driven by a drive motor has a non-circular cross section in the direction perpendicular to the axis, and the wire is inserted through the screw wire. It also includes a detent means having a non-circular opening cross-section corresponding to the non-circular cross-section of the wire. The anti-rotation means can be formed by making the opening cross-section of the wire guide have a non-circular cross-section corresponding to the cross-sectional shape of the wire, or can be formed by forming a wire guide that also serves as the guide, or a wire provided at the end of the motor frame of the drive motor. The insertion hole is provided by making the opening cross section of the insertion hole non-circular so as to correspond to the cross-sectional shape of the wire.

[Effect]

According to the wire drive device configured as described above, the detent means through which the wire is inserted has a non-circular opening cross section corresponding to the non-circular cross section of the wire.
The detent means prevents rotational movement of the wire as it is driven, thereby preventing twisting of the wire.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Reference numeral 1 in FIGS. 1 and 3 denotes a drive motor consisting of a commutator motor capable of forward and reverse rotation by switching the current direction. As shown in FIG. 1, the drive motor has bearings 3 installed inside bearing brackets a formed at both ends of a motor frame 2, and a stator 4 made of a permanent magnet between these bearings 3. A rotor 5 attached to the inner surface of the motor frame 2 and passing through the stator 4 is housed in the motor frame 2, and a pair of brush devices 7 are pressed against a commutator 6 attached to the rotor 5. . The brush device 7 is attached to the inner surface of one end of the motor frame 2 via an insulating member 8.

The rotor 5 has a commutator 6 attached to the outer surface of a rotor shaft 9 whose both ends are rotatably supported by the bearings 3.
A rotor core 10 is attached opposite to the stator 4, and a rotor coil 11 is further wound around the core 10.

The rotor shaft 9 has a hollow structure, and a female threaded portion 12 is formed in a small diameter portion provided on the inner peripheral surface of the upper portion thereof. A screw-type flexible wire 13 is threaded through the rotor shaft 9 and is threaded into a female threaded portion 12 . The wire 13 used has a non-circular cross section in the direction perpendicular to its axis, for example, a substantially oval shape as shown in FIG. Note that 13a in FIGS. 1 and 2 is a convex portion protruding from the arcuate outer surface of the wire 13, which engages with the female screw portion 12, and is provided at a constant pitch on the outer periphery of the wire 13. There is.

Also, wire guides 14 and 15 are provided on both sides of the drive motor 1.
They are arranged respectively. These guides 1415 also serve as rotation prevention means, and as shown in FIG.
The wire guide 14 is formed of a metal pipe having a non-circular opening cross-section corresponding to the cross-sectional shape of the wire 13, that is, an oval-shaped opening cross-section that is larger in circumference than the cross-section of the wire 13. As shown in FIG. 3, a wire 13 is guided in the - direction, and the upper end of this wire 3 is connected to a load, such as a window glass 16 of an automobile, via a connector 17.

Note that the wire guide 14.15 is provided with a groove 14a along its axial direction, as shown in FIG. ing. In addition, 18 to 20 in FIG. 3 are window glass 16 that do not restrict the position in the front-rear direction and left-right direction in the same figure.
A guide member 21 indicates a window opening.

In the wire drive device having the configuration shown below, the drive motor 1
By operating the rotor shaft 9 to rotate the rotor shaft 9 in the forward direction, the wire 13 is sent to the wire guide 14 side through the engagement between the female screw portion] 2 of the rotor shaft 9 and the screw type wire 13. Therefore, the wire 13 pushes up the window glass 16 and closes the window. Further, by rotating the rotor 5 in the reverse direction, the female threaded portion 12 of the rotor shaft 9 and the screw type wire 13 engage with each other, so that the wire 13 is moved to the wire guide 15.
Since it is sent to the side, the wire 13 pulls down the window glass 16 and opens the window.

In such an operation, the wire 13 receives rotational force from the drive motor 1. However, since the wire] 3 and the fixed wire guides 1.4, 1.5 through which it is inserted have non-circular cross sections, the wire 13 is prevented from rotating by the wire guides 14, 15. As a result, the wire 13
are not twisted axially in the wire guide 14.15.

Therefore, a part of the power of the drive motor 1 is not consumed for twisting the wire 13, so that the wire 13 can be driven more efficiently and the performance of the wire drive device can be improved. Furthermore, by preventing the wires 13 from colliding within the wire guide 1415, vibration and noise can be reduced.

Further, in the present invention, as in other embodiments shown in FIGS. 4 and 5, at least one bearing bracket portion 2a of the motor frame 2 may be provided with a rotation preventing means. This anti-rotation means is formed by a wire insertion hole 25 formed in the end face of the bearing bracket 2a, and the opening cross section of this hole 25 is non-circular (in the illustrated case, a As shown in Figure 5, it has an oval shape. Further, the wire guide is formed of a pipe whose opening cross section is circular. It should be noted that the unintended configuration described above is the same as that of the above-mentioned embodiment, so the same parts are given the same reference numerals and the explanation will be omitted.

In the configuration of this other embodiment, the wire insertion hole 25 prevents the wire 13 from twisting within the wire guide 14 by preventing the wire 13 from rotating as the wire 13 is driven by the drive motor. Therefore, the intended purpose of the present invention can be achieved.

Moreover, as described above, in the drive motor 1, the wire 13
Since the wire guide 14 and the like are prevented from rotating, there is no need to make the wire guide 14 and the like non-circular to correspond to the cross-sectional shape of the wire 13. Therefore, since a pipe having a circular opening cross section can be used for the wire guide 4, the cost of the wire guide 14 and the like can be reduced.

〔Effect of the invention〕

According to the present invention configured as above, the screw wire driven by the drive motor has a non-circular cross section in the direction perpendicular to its axis, and a non-circular wire corresponding to the non-circular cross section is used. The structure is formed with a circular opening cross section and is equipped with a detent means through which the wire is inserted, which prevents twisting of the wire and improves wire drive performance, as well as reducing vibration and noise associated with drive. can be lowered.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention, FIG. 1 is a longitudinal cross-sectional view of the drive motor, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 3, and FIG. 3 is a device It is a partially cross-sectional view schematically showing the entire configuration. 4 and 5 show other embodiments of the present invention, in which FIG. 4 is a longitudinal sectional view of one end of the drive motor, and FIG. 5 is a front view of the same end. DESCRIPTION OF SYMBOLS 1... Drive motor, 9... Rotor shaft, 12... Female thread part, 13... Wire, 14.15... Rotation prevention means (wire guide), 25... Rotation prevention means ( wire insertion hole). Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A screw-type wire is passed through a hollow rotor shaft of a drive motor that rotates in forward and reverse directions, and this wire is screwed into a female thread provided on the inner peripheral surface of the rotor shaft. In a wire drive device that moves the wire in the axial direction by rotation of the rotor shaft, the wire has a non-circular cross section in the direction perpendicular to the axis, and the wire is inserted into the wire and A wire driving device characterized by comprising a detent means having a non-circular opening cross-section corresponding to the non-circular cross-section of the wire.