JP6986931B2 - Vehicle door switchgear - Google Patents

Description

The present invention relates to a vehicle door opening / closing device.

The drive device of Patent Document 1 includes a housing tube and a cover tube that slides and guides the housing tube. The housing tube comprises a spindle drive with a threaded spindle and a spindle nut disposed on the threaded spindle, and a rotary drive capable of rotationally driving the spindle drive. The thread spindle is rotatably and non-movably supported in the axial direction by the housing tube and can be rotationally driven by a rotary drive device. The spindle nut is non-rotatably connected to the housing tube. The drive also includes a spindle tube that concentrically surrounds the threaded spindle and a guide tube that is fixed to the housing tube so as to separate and surround the spindle tube. One end of the spindle tube is connected to the spindle nut. In this drive device, when the screw spindle is rotationally driven by the rotary drive device, the cover tube moves in the axial direction together with the spindle nut and the spindle tube.

Further, Patent Document 1 discloses a drive device having a rotation restricting structure that prevents the spindle nut from rotating relative to the guide tube by rotating the spindle nut with the rotation of the screw spindle. .. This rotation control structure is composed of a slider fixed to the spindle tube and an axial slit provided so as to penetrate the guide tube in the radial direction. By plunging the slider into the axial slit, the relative rotation between the spindle tube and the spindle nut connected to the spindle tube and the guide tube and the housing tube fixed to the guide tube is prevented.

Japanese Patent No. 4430044

However, in the drive device of Patent Document 1, the spindle nut, the spindle tube fixed to the spindle nut, and the slider fixed to the spindle tube are formed separately. For this reason, the spindle nut rotates relative to the guide tube due to the mounting condition of each part and variations in machining dimensions, and the rotational drive of the screw spindle efficiently moves the spindle tube and spindle nut in a straight line in the axial direction. It may not be converted.

An object of the present invention is to provide a vehicle door opening / closing device capable of effectively preventing a relative rotation of a spindle nut with respect to a guide tube.

In one aspect of the present invention, the motor drive mechanism, the first housing accommodating the motor drive mechanism, the spindle drive mechanism connected to the motor drive mechanism, and the first housing are arranged coaxially with each other. A second housing that is moved relative to the first housing by the spindle drive mechanism is provided, and the spindle drive mechanism includes a spindle connected to the motor drive mechanism and a spindle nut screwed with the spindle. A push rod having an outer peripheral surface fixed to the spindle nut so as not to rotate relative to the spindle nut and having an outer peripheral surface having a polygonal cross section orthogonal to the longitudinal direction, and a guide tube having a guide portion through which the push rod is inserted. wherein the guide unit have a inner peripheral surface section perpendicular to the longitudinal direction of the guide tube constituting a shape corresponding to the outer peripheral surface of the push rod, the outer peripheral dimension of the spindle nut, of the guide portion Provided is a vehicle door opening / closing device that is larger than the inner peripheral dimension.

According to this vehicle door opening / closing device, the spindle nut is fixed to the push rod so as not to rotate relative to the push rod. Further, when the push rod is inserted into the guide portion of the guide tube, the rotational movement of the spindle is converted into the relative movement of the spindle nut and the push rod with respect to the guide tube. Therefore, it is possible to prevent the spindle nut from rotating relative to the guide tube.

The vehicle door opening / closing device of the present invention can prevent the spindle nut from rotating relative to the guide tube.

The perspective view which shows the rear part of the vehicle body which adopts the door opening / closing device for a vehicle which concerns on 1st Embodiment of this invention. The vertical sectional view of the door opening / closing device for a vehicle which concerns on 1st Embodiment of this invention. An exploded perspective view of the push rod and spindle nut. An exploded perspective view of a guide tube and a push rod integrally provided with a spindle nut. A perspective view of the guide tube and push rod as viewed from the rear. Rear view of guide tube, push rod, and spindle nut. A vertical sectional view of a vehicle door opening / closing device in an extended state.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 1, the vehicle door opening / closing device 1 of the present embodiment has a cylindrical shape and is connected to the door 2a and the body 2b of the vehicle 2. The door 2a is driven to open and close by expanding and contracting the vehicle door opening and closing device 1. In the following description, the "axial direction", "circumferential direction", and "radial direction" indicate the axial direction, the circumferential direction, and the radial direction of the vehicle door opening / closing device 1, respectively.

Referring to FIG. 2, the vehicle door opening / closing device 1 of the present embodiment includes a first housing 10, a second housing 20, a motor drive mechanism 30, and a spindle drive mechanism 40.

The first housing 10 includes a cylindrical accommodating portion 11 that accommodates the motor drive mechanism 30, and a cylindrical cover portion 12 that is screwed and fixed to the accommodating portion 11. Here, in the first housing 10, the accommodating portion 11 and the cover portion 12 may have an integral structure. One end of the accommodating portion 11 in the axial direction (the end on the right side in the figure) is open and is closed by the shaft end member 13. The first housing 10 is connected to the body 2b of the vehicle 2 via a ball joint (not shown) connected to the shaft end member 13.

The second housing 20 has a cylindrical shape, and the outer diameter of the second housing 20 is smaller than the inner diameter of the first housing 10. The second housing 20 is arranged coaxially with respect to the first housing 10 and is housed inside the first housing 10 so as to be relatively movable in the axial direction with respect to the first housing 10. One end of the second housing 20 is closed by a shaft end member 21. The second housing 20 is connected to the door 2a of the vehicle 2 via a ball joint (not shown) connected to the shaft end member 21. Further, in the radial direction, the coil spring 22 is arranged coaxially with the second housing 20 inside the second housing 20.

One end of the coil spring 22 (the right end in the figure) is in contact with the first housing 10, and the other end of the coil spring 22 (the left end in the figure) is the second housing 20. Is in contact with. The coil spring 22 is arranged in a compressed state, and elastically urges the first housing 10 and the second housing 20 in the direction in which the vehicle door opening / closing device 1 extends.

The motor drive mechanism 30 includes an electric motor 31 as a drive source and a speed reducer 32 that reduces the rotational speed of the electric motor 31. The motor drive mechanism 30 is housed inside the housing portion 11 of the first housing 10.

The spindle drive mechanism 40 includes a spindle 50, a spindle nut 60, a push rod 70, and a guide tube 80. The spindle drive mechanism 40 is arranged inside the coil spring 22 in the radial direction. Specifically, in the radial direction, the guide tube 80 is arranged inside the coil spring 22, and the push rod 70 is housed inside the guide tube 80. Further, the spindle nut 60 is fixed to one end of the push rod 70. The spindle 50 is arranged inside the push rod 70 and the spindle nut 60 in the radial direction.

As most clearly shown in FIG. 2, the spindle 50 is provided with a thread groove 50a on the outer peripheral surface. The spindle 50 is coaxially arranged in the first housing 10. As most clearly shown in FIG. 2, the proximal end portion 50b of the spindle 50 is rotatably supported by a bearing 14 provided in the first housing 10. Further, the spindle 50 is mechanically connected to the rotating shaft of the electric motor 31 via the speed reducer 32, and is rotationally driven by the electric motor 31.

Referring to FIG. 3, the spindle nut 60 has a cylindrical shape and has a diameter larger than the outer peripheral surface 70a of the substantially square tubular push rod 70 described later. Referring to FIG. 2 together, a thread groove 60a is formed on the inner peripheral surface of the spindle nut 60, and is screwed with the thread groove 50a provided on the outer periphery of the spindle 50. The spindle nut 60 of the present embodiment is made of resin.

The push rod 70 has a substantially square cylinder shape, and has a hexagonal outer peripheral surface and a circular inner peripheral surface in a cross section orthogonal to the longitudinal direction of the push rod 70. Specifically, the push rod 70 has six outer peripheral surfaces 70a, each of which is a flat surface. A plurality of (five in the illustrated embodiment) through holes 71 are provided on each outer peripheral surface 70a of the push rod 70 of the present embodiment. The push rod 70 is fixed at one end in the axial direction so as not to rotate relative to the spindle nut 60. In the present embodiment, the spindle nut 60 made of resin and the push rod 70 made of metal are integrally molded by insert molding. As described above, the spindle nut 60 has a larger diameter than the outer peripheral surface 70a of the push rod 70, and when fixed to the push rod 70, the outer peripheral surface of the push rod 70 is most clearly shown in FIG. A wall portion 60b extending from 70a perpendicular to the axial direction of the push rod 70 is formed. Further, as most clearly shown in FIG. 2, the resin material of the spindle nut 60 filled inside the through hole 71 of the push rod 70 is a columnar engaging portion 61 of the spindle nut 60 that engages with the through hole 71. Will be. A resin rotor 72 is provided on the inner circumference of the push rod 70 to rotatably support the tip portion 50c of the spindle 50 on the inner circumference of the push rod 70 without rattling. Both ends of the spindle 50 are supported by a bearing 14 provided in the first housing 10 and a resin rotor 72 provided in the tip portion 50c of the spindle 50, and the spindle 50 is arranged coaxially with the first housing 10.

Referring to FIG. 2, the guide tube 80 is fixed to the first housing 10. Referring to FIGS. 4 and 5, the guide tube 80 includes a cylindrical main body 81 and a guide portion 82 provided on one end side of the main body 81 through which the push rod 70 is inserted. The inner peripheral surface of the main body 81 of the guide tube 80 is circular in a cross section orthogonal to the axial direction. The push rod 70 is housed in the main body 81 of the guide tube 80, and the inner peripheral surface of the main body 81 of the guide tube 80 faces the outer peripheral surface 70a of the push rod with a sufficient distance. Referring to FIG. 6, the inner peripheral surface of the guide portion 82 has a shape corresponding to the outer peripheral surface 70a of the push rod 70 so that the push rod 70 can slide. In the present embodiment, the inner peripheral surface of the guide portion 82 is hexagonal in a cross section orthogonal to the longitudinal direction of the guide tube 80. Specifically, the guide portion 82 has six inner peripheral surfaces 82a, each of which faces the outer peripheral surface 70a of the push rod 70 and is a flat surface. That is, in the cross section orthogonal to the axial direction, the cross-sectional shape formed by the inner peripheral surface 82a of the guide portion 82 is a similar shape slightly smaller than the cross-sectional shape formed by the outer peripheral surface 70a of the push rod 70. The push rod 70 is attached to the guide tube 80 so as to be relatively movable and non-rotatable by being inserted into the guide portion 82. Further, the guide portion 82 is formed according to the outer shape of the spindle nut 60 so that the spindle nut 60 can be locked. Specifically, as shown most clearly in FIG. 7, in the present embodiment, the inner peripheral dimension D1 of the guide portion 82 is smaller than the outer peripheral dimension D2 of the spindle nut 60. The guide portion 82 of the guide tube 80 is provided with a locking surface 82b that faces the wall portion 60b of the spindle nut 60 and is perpendicular to the axial direction.

When the door 2a of the vehicle 2 is closed, the vehicle door opening / closing device 1 has the coil spring 22 in the most compressed state as shown in FIG. 2, and the spindle nut 60 is the base end portion of the spindle 50. It is located near 50b. When the electric motor 31 is driven from this state, the rotation of the output shaft of the electric motor 31 is decelerated by the speed reducer 32 and transmitted to the spindle 50, and the spindle 50 is rotationally driven. Since the spindle nut 60 and the push rod 70 are engaged with the guide tube 80 and the first housing 10 so as not to rotate relative to each other, the rotational movement of the spindle 50 is a straight line relative to the guide tube 80 of the spindle nut 60. Converted to exercise. Specifically, the spindle nut 60 and the push rod 70 move in the axial direction along the inner circumference of the guide pipe 80. As the push rod 70 moves, the second housing 20 moves relative to the first housing 10. As described above, the relative movement of the first housing 10 and the second housing 20 causes the vehicle door opening / closing device 1 to extend and open the door 2a connected via the shaft end member 21. Drive up to. Here, as most clearly shown in FIG. 7, the relative movement of the push rod 70 with respect to the guide tube 80 is the locking surface formed on the wall portion 60b of the spindle nut 60 and the guide portion 82 of the guide tube 80. It is regulated by contact with 82b.

The spindle nut 60 is fixed to the push rod 70 so as not to rotate relative to the push rod 70. Further, when the push rod 70 is inserted into the guide portion 82 of the guide tube 80, the rotational movement of the spindle 50 is converted into the relative movement of the spindle nut 60 and the push rod 70 with respect to the guide tube 80. Therefore, it is possible to prevent the spindle nut 60 from rotating relative to the guide tube 80.

In the cross section orthogonal to the axial direction, the cross section formed by the inner peripheral surface 82a of the guide portion 82 of the guide tube 80 is a polygon slightly smaller and similar to the cross section formed by the outer peripheral surface 70a of the push rod 70. Therefore, the relative rotation of the push rod 70 with respect to the guide tube 80 can be reliably prevented.

Since the inner peripheral surface of the main body 81 of the guide tube 80 faces the outer peripheral surface 70a of the push rod 70 at a distance, when the push rod 70 and the guide tube 80 move relatively, the main body of the guide tube 80 The 81 does not come into contact with the outer peripheral surface 70a of the push rod 70. Therefore, the sliding resistance when the push rod 70 and the guide tube 80 move relatively can be reduced.

Since the outer peripheral dimension of the spindle nut 60 is larger than the inner peripheral dimension of the guide portion 82 of the guide tube 80, the spindle nut 60 is axially locked by the guide portion 82 of the guide tube 80, so that the guide tube 80 and the guide tube 80 are engaged. Relative movement with the push rod 70 can be regulated.

Since the spindle nut 60 is integrally molded with the push rod 70 by insert molding, it is possible to prevent the spindle nut 60 from rotating relative to the push rod 70 and falling off.

Since the push rod 70 and the spindle nut 60 are fixed by the engagement between the through hole 71 of the push rod 70 and the engaging portion 61 of the spindle nut 60, the spindle nut 60 is prevented from falling off from the push rod 70. can.

The vehicle door opening / closing device 1 of the present invention is not limited to the configuration of the above embodiment, and various modifications can be made.

For example, the cross-sectional shape of the spindle nut 60 is not limited to a circle, and may be another shape such as a polygon. Further, if the wall portion 60b of the spindle nut 60 and the locking surface 82b provided on the guide portion 82 of the guide tube 80 are formed, the inner peripheral surface of the guide tube 80 may have another shape such as a polygon. , Not only the inner peripheral surface but also the outer peripheral surface may have other shapes such as polygons.

Further, the first housing 10 may not be divided into the accommodating portion 11 and the cover portion 12.

1 Vehicle door opening / closing device 2 Vehicle 2a Door 2b Body 10 1st housing 11 Housing part 12 Cover part 13 Shaft end member 14 Bearing 20 2nd housing 21 Shaft end member 22 Coil spring 30 Motor drive mechanism 31 Electric motor 32 Reducer 40 Spindle drive mechanism 50 Spindle 50a Thread groove 50b Base end 50c Tip 60 Spindle nut 60a Thread groove 60b Wall 61 Engagement 70 Push rod 70a Outer circumference 71 Through hole 72 Resin rotor 80 Guide tube 81 Main body 82 Guide part 82a Peripheral surface 82b Locking surface

Claims (5)

Motor drive mechanism and
A first housing accommodating the motor drive mechanism and
A spindle drive mechanism connected to the motor drive mechanism and
It is provided with a second housing that is coaxially arranged with respect to the first housing and is moved relative to the first housing by the spindle drive mechanism.
The spindle drive mechanism is
With the spindle connected to the motor drive mechanism,
A spindle nut screwed with the spindle and
A push rod that is fixed so as not to rotate relative to the spindle nut and has an outer peripheral surface whose cross section orthogonal to the longitudinal direction constitutes a polygon.
A guide tube having a guide portion through which the push rod is inserted is provided.
The guide portion may have a inner peripheral surface section perpendicular to the longitudinal direction of the guide tube constituting a shape corresponding to the outer peripheral surface of the push rod,
A vehicle door opening / closing device in which the outer peripheral dimension of the spindle nut is larger than the inner peripheral dimension of the guide portion. The inner peripheral surface of the guide portion is a polygon similar to a polygon whose cross section orthogonal to the longitudinal direction of the guide tube is orthogonal to the longitudinal direction of the push rod on the outer peripheral surface of the push rod. The vehicle door opening / closing device according to claim 1. The guide tube includes a main body in which the guide portion is provided on one end side.
The vehicle door opening / closing device according to claim 1 or 2, wherein the main body has an inner peripheral surface facing the outer peripheral surface of the push rod at a distance. Motor drive mechanism and
A first housing accommodating the motor drive mechanism and
A spindle drive mechanism connected to the motor drive mechanism and
With a second housing that is arranged coaxially with the first housing and moves relative to the first housing by the spindle drive mechanism.
Equipped with
The spindle drive mechanism is
With the spindle connected to the motor drive mechanism,
Spindle nuts that screw into the spindle and
A push rod that is fixed so as not to rotate relative to the spindle nut and has an outer peripheral surface whose cross section orthogonal to the longitudinal direction constitutes a polygon.
With a guide tube having a guide portion through which the push rod is inserted
Equipped with
The guide portion has an inner peripheral surface whose cross section orthogonal to the longitudinal direction of the guide tube forms a shape corresponding to the outer peripheral surface of the push rod.
The guide portion is provided on one end side of the guide tube and is provided.
The inner peripheral surface of the guide portion in the cross section orthogonal to the longitudinal direction of the guide tube has a polygon similar to the polygon formed by the outer peripheral surface of the push rod in the cross section orthogonal to the longitudinal direction of the push rod. A vehicle door opening / closing device to be configured. The vehicle door opening / closing device according to any one of claims 1 to 4, wherein the push rod and the spindle nut are insert-molded.

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