CN216741157U

CN216741157U - Driving device for opening and closing member

Info

Publication number: CN216741157U
Application number: CN201990001354.4U
Authority: CN
Inventors: 佐佐木一幸
Original assignee: Mitsui Kinzoku ACT Corp
Current assignee: Mitsui Kinzoku ACT Corp
Priority date: 2019-04-17
Filing date: 2019-08-27
Publication date: 2022-06-14
Anticipated expiration: 2029-08-27
Also published as: WO2020213187A1; JP7024154B2; JP2020176423A

Abstract

The utility model provides a driving device of an opening and closing member. In order to prevent water from entering the inner space of the driving device, the driving device of the opening and closing member comprises: an outer cylinder (5) having one end connected to either the vehicle body or the opening/closing member; an inner cylinder (4) having one end connected to either one of the vehicle body and the opening/closing member, and inserted into the outer cylinder (5) so as to be relatively movable in the axial direction; and a gasket (9) that is provided between the inner peripheral surface of the outer tube (5) and the outer peripheral surface of the inner tube (4) and seals a gap between the inner peripheral surface and the outer peripheral surface. A motor (10) and a spindle (12) which can rotate around an axis by the motor (10) are contained in the inner cylinder (4), a nut (7) which is in threaded connection with the spindle (12) is contained in the outer cylinder (5), an opening (53) which communicates an internal space (S) formed by the inner cylinder (4) and the outer cylinder (5) with the outside is arranged in the outer cylinder (5), and the opening (53) is sealed by a filter (14) which is permeable to air and impermeable to water.

Description

Driving device for opening and closing member

Technical Field

The present invention relates to a drive device for an opening/closing member that opens and closes an opening/closing member supported by a vehicle body so as to be openable and closable.

Background

The drive device for the shutter described in patent document 1 includes: the upper end in the axial direction is connected with the vehicle body; and an inner cylinder, the lower end of the axial direction is connected with the back door, and the inner cylinder is inserted into the outer cylinder in a mode of relatively moving in the axial direction, a motor and a mandrel rotated by the motor are contained in the outer cylinder, a nut in threaded connection with the mandrel is contained in the inner cylinder in a mode of being incapable of rotating and being incapable of moving in the axial direction, and the inner cylinder is relatively moved in the axial direction relative to the outer cylinder by converting the rotating motion of the mandrel into the linear motion of the nut, so that the back door can be opened and closed.

Patent document 1: japanese patent No. 6242355

In the drive device for the shutter described in patent document 1, since the inner cylinder is smoothly movable in the axial direction relative to the outer cylinder, a gap needs to be set between the inner circumferential surface of the outer cylinder and the outer circumferential surface of the inner cylinder that contacts the inner circumferential surface. Therefore, there is a risk that water such as rainwater or cleaning water enters the inner space between the outer cylinder and the inner cylinder through the gap as the inner cylinder moves relative to the outer cylinder in the axial direction (hereinafter referred to as "telescopic operation"). If water enters the inner space, there are problems as follows: water adheres to electric components including a motor, a spindle, and the like disposed in the internal space, and causes malfunction.

As a method for solving the above problem, it is conceivable to provide an annular spacer between the inner circumferential surface of the outer cylinder and the outer circumferential surface of the inner cylinder to completely close the gap. However, if the gap is completely closed, a flow passage of air connecting the inner spaces of the outer and inner cylinders to the outside is cut off. If the air flow passage is cut off, the following problems occur: as the volume of the internal space changes due to the expansion and contraction operation of the drive device, a reaction force due to the compression and expansion of the air in the internal space occurs, which results in a problem that the expansion and contraction operation is heavy and lacks smoothness.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, an object of the present invention is to provide a driving device for a shutter that prevents water from entering an internal space of the driving device and can smoothly perform an expansion and contraction operation.

According to the present invention, the above problems are solved as follows.

A drive device for a shutter according to the present invention is a drive device for a shutter that opens and closes a shutter supported by a vehicle body so as to be openable and closable, the drive device including: an outer cylinder having a joint provided at one end thereof connected to either the vehicle body or the opening/closing member, the one end being closed and the other end being open; an inner tube having a joint provided at one end thereof connected to the other of the vehicle body and the opening/closing member, the one end being closed and the other end being open, the other end side being inserted into the outer tube so as to be relatively movable in an axial direction; and a packing provided between an inner peripheral surface of the outer tube and an outer peripheral surface of the inner tube, the packing sealing a gap between the inner peripheral surface and the outer peripheral surface, wherein one of the outer tube and the inner tube is a first tube, and the other of the outer tube and the inner tube is a second tube, a motor and a spindle are housed in the first tube, the spindle is rotatable about an axis and immovable in an axial direction by the motor, a nut is housed in the second tube, the nut is immovable in the axial direction and unrotatable about the axis with respect to the second tube, and is screwed to the spindle so as to be movable in the axial direction with respect to the spindle by rotation of the spindle, and an opening for communicating an internal space formed by the first tube and the second tube with an outside is provided in the second tube, the opening is closed with a gas-permeable, water-impermeable filter.

Preferably, the filter is formed of a porous material.

Preferably, the cross-sectional shape of the gasket is trapezoidal.

According to the present invention, the spacer is provided in the gap between the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder, thereby preventing water from entering the inner space of the drive device. Further, by providing an opening in either one of the inner cylinder and the outer cylinder and closing the opening with an air-permeable and water-impermeable filter, water can be prevented from entering the internal space, and the telescopic operation can be performed smoothly without receiving resistance caused by the compression and expansion of air accompanying the change in volume of the internal space.

Drawings

Fig. 1 is a side view of a vehicle rear portion including a drive device for an opening/closing tool according to the present invention.

Fig. 2 is a front view of the extended state of the drive device.

Fig. 3 is a longitudinal sectional view taken along line III-III in fig. 2.

Fig. 4 is a longitudinal sectional view of the contracted state of the drive device.

Fig. 5 is an enlarged view of a V portion in fig. 4.

Fig. 6 is an enlarged view of a VI portion in fig. 3.

Fig. 7 is an enlarged view of a VII portion in fig. 3.

Detailed Description

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a side view of a vehicle rear part including a drive device 1 of an opening/closing tool according to the present invention. The back door 3 as an opening/closing member is supported by the vehicle body 2 at the rear of the vehicle by a pair of left and right door hinges (not shown) so as to be openable and closable in the vertical direction about an axis line oriented in the horizontal direction. By engaging a door lock device (not shown) provided at the center of the lower portion of the back door 3 with a lock pin (not shown) provided on the vehicle body 2, the back door 3 is held at a fully closed position closing the rear opening of the vehicle body 2 as shown by a two-dot chain line in fig. 1, and by releasing the engagement of the door lock device with the lock pin, the lower end portion of the back door 3 is popped up and moved to a fully open position opening the rear opening as shown by a solid line in fig. 1.

Fig. 2 is a front view of the drive device 1 in an extended state (corresponding to the fully open position of the back door 3), fig. 3 is a vertical cross-sectional view taken along line III-III in fig. 2, and fig. 4 is a vertical cross-sectional view of the drive device 1 in a contracted state (corresponding to the fully closed position of the back door 3).

The drive device 1 includes a cylindrical inner tube 4 and a cylindrical outer tube 5, an upper end of the inner tube 4 is connected to the vehicle body 2, a lower end of the outer tube 5 is connected to the back door 3, and the outer tube 5 is inserted so that a lower portion of the inner tube 4 is relatively movable in an axial direction (a telescopic direction), and by converting a rotational motion of a power source such as a motor housed in the inner tube 4 into a linear motion, the outer tube 5 is caused to extend and contract in the axial direction (a longitudinal direction of the inner tube 4 and the outer tube 5) with respect to the inner tube 4, thereby opening and closing the shutter 3.

In addition, the orientation of the drive device 1 used in the present specification is based on a state in which the drive device 1 is substantially oriented in the vertical direction in a state in which the back door 3 is closed.

Since the outer cylinder 5 is cylindrical with a lower end sealed in a sealed state and an upper end open, the door joint 51, which is a ball joint provided at the lower end, is connected to the door 3 so as to be rotatable about a rotation axis directed in the left-right direction.

The outer cylinder 5 is provided with an opening 53, and the opening 53 is used for communicating the internal space S formed by the inner cylinder 4 and the outer cylinder 5 with the outside. Preferably, the opening 53 is provided at a position not closed by the inner cylinder 4 regardless of the state of the drive device 1 between the extended state and the retracted state. Specifically, as is apparent from fig. 4 and 5, in the state where the drive device 1 is in the contracted state, the opening 53 is provided below the lower end 4a of the inner tube 4.

The opening 53 is closed by the filter 14, and the filter 14 is formed of a material that is permeable to air but impermeable to water. Preferably, the filter 14 is formed of a porous material. This prevents water such as rain water and car wash water from entering the internal space S through the opening 53 of the outer tube 5, and allows outside air to be introduced into the internal space S through the opening 53 and air in the internal space S to be discharged to the outside through the opening 53.

A vertically cylindrical spring guide 6 and a nut 7 fixed to the upper portion of the spring guide 6 are housed in the outer cylinder 5.

The spring guide 6 has an upper end opened and a lower end fixed to a lower end in the outer cylinder 5 so as not to rotate around the axis and move in the axial direction, and moves in the axial direction relative to the inner cylinder 4 integrally with the outer cylinder 5. A tapered portion 61 having an outer diameter gradually decreasing upward is provided on the upper outer peripheral surface of the spring guide 6. The tapered portion 61 is provided to prevent the tip end of the spring guide 6 from being caught by the inner side of the coil of the compression coil spring 13 when the compression coil spring 13 described later expands and contracts, and to smoothly expand and contract the compression coil spring 13.

The nut 7 has a female screw hole 71 (see fig. 6) penetrating in the axial direction. The female screw hole 71 is used for screwing with a spindle 12 described later. The nut 7 is fixed to the upper inner peripheral surface of the spring guide 6 in a state of being unable to rotate about the axis and move in the axial direction. Thereby, the nut 7 is fixed to the outer cylinder 5 via the spring guide 6 in a state of being unable to rotate about the axis and move in the axial direction.

As shown in fig. 6 and 7, an annular groove 52 is provided on the upper inner circumferential surface of the outer tube 5. Preferably, the cylindrical end cap 8 is fitted around the upper outer peripheral surface of the outer cylinder 5 without a gap, so that an annular groove 52 is formed between the inner peripheral surface of the end cap 8 and the upper end of the outer cylinder 5.

An annular gasket 9 made of rubber or the like is fitted into the annular groove 52. The gasket 9 is in close contact with the inner circumferential surface of the annular groove 52 and the outer circumferential surface of the inner tube 4, thereby completely closing a gap G (see fig. 7) between the outer circumferential surface of the inner tube 4 and the inner circumferential surface of the outer tube 5. This prevents water from entering the internal space S formed by the inner cylinder 4 and the outer cylinder 5 in the drive device 1, and prevents water from adhering to the motor 10, the speed reduction mechanism 11, the spindle 12, and the like, which are disposed in the internal space S and will be described later.

Preferably, as shown in fig. 7, the cross-sectional shape of the spacer 9 is a trapezoid having a long side on the outer peripheral side and a short side on the inner peripheral side. The opening width of the annular groove 52 in the vertical direction is set to be larger than the long side of the spacer 9. Thus, even if the axial direction of the outer cylinder 5 and the axial direction of the inner cylinder 4 are offset from each other when the drive device 1 extends and contracts in response to the opening and closing operation of the back door 3, the offset can be effectively absorbed.

The inner cylinder 4 is cylindrical with a closed upper end and an open lower end, and a vehicle body joint 41 formed of a ball joint provided at the upper end is connected to the vehicle body 2 so as to be rotatable about a rotation axis extending in the left-right direction, and is inserted into the outer cylinder 5 so as to be relatively movable in the axial direction.

The inner cylinder 4 houses a motor 10 as a power source, a speed reduction mechanism 11 for reducing the rotation speed of the motor 10, and a spindle 12 connected to the speed reduction mechanism 11.

An electric wire outlet 42 is provided at the upper end of the inner tube 4, and the electric wire outlet 42 is used for leading out an electric wire 101 electrically connected to the motor 10.

The motor 10 is held in the upper part inside the inner drum 4 without rattling. The electric wire 101 electrically connected to the motor 10 is led out from the electric wire outlet 42 to the outside.

The speed reduction mechanism 11 is formed of a planetary gear that reduces the rotation of the motor 10 below the motor 10, and the reduced rotation is output from the output shaft 111.

The spindle 12 is rotatably supported by a bearing 15 supported in the inner cylinder 4 so that an upper end portion in the axial direction of the spindle 12 is connected to an output shaft 111 of the speed reduction mechanism 11, and is accommodated in the inner cylinder 4 so as to be rotatable about the axis and immovable in the axial direction with respect to the inner cylinder 4. The bearing 15 is supported in the inner drum 4 by a spring plate 16, which spring plate 16 is fixed in the inner drum 4 in a rotationally fixed manner. The output shaft 111 is connected to the spindle 12 by directly connecting the upper end portion of the spindle 12 to the output shaft 111, or connecting the upper end portion of the spindle 12 to the output shaft 111 via a clutch and/or a brake mechanism.

The lower portion of the spindle 12 is inserted into the spring guide 6 so as to be movable in the axial direction, and is screwed into a female screw hole 71 of a nut 7 fixed in the spring guide 6, the spring guide 6 being fixed in the outer cylinder 5. Thus, if the spindle 12 is rotated about the axis by the driving force of the motor 10, the nut 7 converts the rotational motion of the spindle 12 into a linear motion, and moves linearly in the axial direction together with the spring guide 6. Accordingly, the outer cylinder 5 moves in the axial direction relative to the inner cylinder 4 integrally with the nut 7.

A compression coil spring 13 is housed between the inner tube 4 and the outer tube 5, and the compression coil spring 13 applies an urging force toward the expansion side in the axial direction to the inner tube 4 and the outer tube 5.

The compression coil spring 13 has an upper end abutting against a spring plate 16 fixed to the inner cylinder 4, a lower end abutting against a lower end in the outer cylinder 5, a lower half disposed in a gap between the outer peripheral surface of the spring guide 6 and the inner peripheral surface of the outer cylinder 5, and an upper half disposed in a gap between the outer peripheral surface of the mandrel 12 and the inner peripheral surface of the inner cylinder 4, and thereby the compression coil spring 13 applies an urging force toward the expansion side in the axial direction to the inner cylinder 4 and the outer cylinder 5. In the contracted state of the drive device 1 shown in fig. 4, the spindle 12 enters the spring guide 6 over substantially the entire length thereof, and the compression coil spring 13 is interposed in a compressed state over substantially the entire length thereof in a gap between the outer peripheral surface of the spring guide 6 and the inner peripheral surface of the outer cylinder 5.

The following description explains the operation of the drive device 1.

When the back door 3 is at the fully closed position, the drive device 1 is in the contracted state shown in fig. 4, and when the back door 3 is at the fully open position, the drive device 1 is in the expanded state shown in fig. 2 and 3.

In the contracted state of the drive device 1 shown in fig. 4, if the spindle 12 is rotated in a predetermined direction by the driving force of the motor 10 and the nut 7 is moved to the expansion side (downward in fig. 4) in the axial direction, the outer cylinder 5 is moved to the expansion side together with the spring guide 6 and the nut 7. By this operation, the drive device 1 is brought into an extended state, and the back door 3 is moved from the fully closed position in the opening direction. In this case, since the gap G between the outer peripheral surface of the inner cylinder 4 and the inner peripheral surface of the outer cylinder 5 is sealed by the packing 9, water is prevented from entering the inner space S.

When the drive device 1 performs the expansion operation, the volume of the internal space S increases with the expansion operation, and therefore, the outside air is introduced into the internal space S through the filter 14 provided in the opening 53 of the outer cylinder 5. Thus, even if the gap G between the outer peripheral surface of the inner tube 4 and the inner peripheral surface of the outer tube 5 is sealed by the gasket 9, the outer tube 5 can be smoothly moved toward the expansion side without receiving resistance caused by the expansion of air in the internal space S. Further, since the opening 53 is closed by the filter 14, water does not enter the internal space S from the opening 53.

In the extended state of the drive device 1 shown in fig. 2 and 3, if the spindle 12 is rotated in the direction opposite to the predetermined direction by the driving force of the motor 10 and the nut 7 moves to the contraction side (upward in fig. 3) in the axial direction, the outer cylinder 5 moves to the contraction side together with the spring guide 6 and the nut 7. By this operation, the driving device 1 is brought into a contracted state, and the back door 3 is moved from the fully open position in the closing direction. Even in this case, since the gap G between the outer peripheral surface of the inner cylinder 4 and the inner peripheral surface of the outer cylinder 5 is sealed by the packing 9, water is prevented from entering the inner space S.

When the driving device 1 performs the contraction operation, the volume of the internal space S is reduced in association with the contraction operation, and therefore the air in the internal space S is discharged to the outside through the filter 14. Thus, even if the gap G between the outer peripheral surface of the inner tube 4 and the inner peripheral surface of the outer tube 5 is sealed by the gasket 9, the outer tube 5 can be smoothly moved toward the contraction side without receiving resistance caused by the air compression in the internal space S.

Although one embodiment of the present invention has been described above, the following modifications and variations may be made to the above embodiment without departing from the scope of the present invention.

(a) The inner tube 4 is connected to the back door 3, and the outer tube 5 is connected to the vehicle body 2.

(b) The motor 10, the speed reduction mechanism 11, and the spindle 12 are disposed in the outer cylinder 5, and the spring guide 6 and the nut 7 are disposed in the inner cylinder 4. In this case, the opening 53 and the filter 14 are also provided in the outer cylinder 5.

(c) The opening/closing member is, for example, a trunk lid or a side door other than the back door.

(f) The combinations (a) to (c) are appropriately selected.

Description of the reference numerals

1 drive unit, 2 car body, 3 back door (opening and closing member), 4 inner cylinder, 4a lower end, 41 car body connector, 42 wire leading-out port, 5 outer cylinder, 51 door connector, 52 annular groove, 53 opening, 6 spring guide, 61 taper, 7 nut, 71 female screw hole, 8 end cover, 9 gasket, 10 motor, 101 wire, 11 speed reducing mechanism, 111 output shaft, 12 mandrel, 13 compression coil spring 14 filter, 15 bearing, 16 spring plate, G gap, R air flow passage, S inner space.

Claims

1. A drive device for an opening/closing member, which opens/closes an opening/closing member supported openably/closably on a vehicle body, comprising:

an outer cylinder having a joint provided at one end thereof connected to either one of the vehicle body and the shutter, the one end being closed and the other end being open;

an inner tube having a joint provided at one end thereof connected to the other of the vehicle body and the opening/closing member, the one end being closed and the other end being open, the other end side being inserted into the outer tube so as to be relatively movable in an axial direction; and

a gasket provided between an inner peripheral surface of the outer cylinder and an outer peripheral surface of the inner cylinder, the gasket sealing a gap between the inner peripheral surface and the outer peripheral surface,

one of the outer cylinder and the inner cylinder is a first cylinder, the other of the outer cylinder and the inner cylinder is a second cylinder,

a motor and a spindle that is rotatable about an axis and immovable in an axis direction by the motor are housed in the first cylinder,

a nut that is received in the second tube, is immovable in an axial direction and is unrotatable about an axis with respect to the second tube, and is screwed to the spindle so as to be movable in the axial direction with respect to the spindle by rotation of the spindle,

an opening for communicating an inner space formed by the first cartridge and the second cartridge with the outside is provided in the second cartridge, and the opening is closed with a filter that is permeable to air and impermeable to water.

2. The driving device of the opening/closing member according to claim 1, wherein the filter is formed of a porous material.

3. The drive device of the shutter according to claim 1 or 2, wherein the cross-sectional shape of the spacer is a trapezoid.