WO2013161687A1

WO2013161687A1 - Linear motion device and drive device for opening/closing body

Info

Publication number: WO2013161687A1
Application number: PCT/JP2013/061583
Authority: WO
Inventors: 弘行稲垣
Original assignee: 株式会社ハイレックスコーポレーション
Priority date: 2012-04-27
Filing date: 2013-04-19
Publication date: 2013-10-31
Also published as: JPWO2013161687A1

Abstract

[Problem] To provide a linear motion device, which has a simple configuration and uses a feed screw mechanism and a gas spring from which gas does not easily leak, and a drive device for an opening/closing body using same. [Solution] The present invention uses a linear motion device, which is provided with: an actuator that has a long member with a helical groove and a nut member that moves on the groove; a gas spring disposed coaxially with the actuator; and an attachment member that is attached to the object. The attachment member is connected to the nut member via a linking member so as to move in synchrony with the nut member. The rod of the gas spring is connected to the attachment member and moves the object as a result of driving by the actuator.

Description

Linear motion device and opening / closing body drive device

The present invention relates to a linear motion device that includes a feed screw mechanism and a gas spring and linearly moves a moving object, and an open / close body drive device including the linear motion device.

For the lift gate and hatch gate opening and closing mechanisms of automobiles, a linear motion device having a feed screw mechanism and a gas spring is often used. In the linear motion device, the gas spring assists the movement of the moving object when moving the moving object (here, lift gate or hatch gate) by the feed screw mechanism.

When using a linear motion device in which a screw / nut structure and a gas spring are provided in series as such a linear motion device, it is easy to apply a force to the mounting portion of the screw / nut structure to the gas spring, and the strength is increased. Cost. Therefore, as a linear motion device combining a screw / nut structure and a gas spring, for example, a gas spring described in JP-T-2008-505286 has a piston head having a thread formed on the outer peripheral portion. This thread engages with a meshing screw formed inside the cylinder. Further, a piston rod is attached to the piston head, and the piston rod is attached to the motor via a connecting portion.

Then, when the piston rod is rotated by the power of the motor, the piston head moves along the cylinder by the interaction between the screw thread and the meshing screw. The movement of the piston head in the cylinder is assisted by the pressure of the compressed gas enclosed in the cylinder (chamber).

The linear motion device having such a configuration forms a feed screw mechanism inside the gas spring by forming a screw thread on the piston head of the gas spring and an engagement screw engaging the screw thread on the inner surface of the cylinder. The device becomes compact.

Special table 2008-505286

However, when a screw is formed on the outer periphery of the piston head and the inner surface of the cylinder, as in the gas spring described in JP-T-2008-505286, the structure becomes complicated and the gas in the gas spring is easily released.

Therefore, an object of the present invention is to provide a linear motion device using a gas spring that has a simple structure and is difficult for gas to escape, and a feed screw mechanism, and an opening / closing body drive device using the linear motion device.

To achieve the above object, the present invention provides an actuator having a long member having a spiral groove, a nut member moving on the groove, a gas spring arranged coaxially with the actuator, and an object. An attachment member to be attached, and the attachment member is connected via an interlocking member so as to operate in synchronization with the nut member, and the rod of the gas spring is connected to the attachment member, and is driven by the actuator. A linear motion device that moves an object is provided.

(1) According to the present invention, the gas spring assists the actuator that operates the mounting member because the gas spring and the actuator are mounted on the mounting member that is mounted on the object so that the force acts in parallel. Thus, a large force is not applied to the mounting portion between the actuator and the gas spring. Therefore, when one end of the gas spring is connected to the mounting member attached to the object and the actuator is connected to the other end of the gas spring, it is easy to ensure the strength of the connection portion between the gas spring and the actuator. It is.

(2) In the case where the present invention has a configuration in which the long member is a cylindrical body and at least a part of the gas spring is housed in the cylindrical body, the gas is contained in the cylindrical body. Since the spring is stored, the storage is easy, and space saving is also easy.

(3) In the case where the mounting member is fixed to the interlocking member and the rod of the gas spring is connected to the mounting member via a bearing, the mounting member is accompanied by a rotation operation of the actuator. And the friction with the gas spring are suppressed.

(4) The present invention can be suitably used as a drive device for an opening / closing body, such as a drive device such as a door that opens and closes by turning around a hinge, particularly a power lift gate used in a back door.

It is sectional drawing which shows the linear motion apparatus concerning this invention. FIG. 2 is a cross-sectional view of the linear motion device shown in FIG. 1 in a long state. It is the schematic which shows the rear part of the vehicle using the opening-closing body drive device concerning this invention.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a linear motion device according to the present invention. As shown in FIG. 1, the linear motion device A includes a power unit 1, an actuator 2 including a sleeve screw 22 (long member) and a nut member 23, a gas spring 3, and an attachment member 4 attached to an object. It has. In the linear motion device A, the actuator 2 expands and contracts in the linear direction by the power from the power unit 1.

The power unit 1 is connected to the housing 10, the motor 11 fixed inside the housing 10, the gear box 12 attached to the output shaft of the motor 11, and the gear box 12 to transmit the output of the motor 11 to the actuator 2. Power transmission shaft 13, a bearing portion 14 (including a radial bearing) that rotatably supports the power transmission shaft 13, and a rotation support portion that is disposed at a distal end portion of the housing 10 where the actuator 2 is not connected. 15.

The housing 10 is a cylindrical member, and is an exterior of the power unit 1 and also an exterior of the linear motion device A. The housing 10 protects the motor 11, the gear box 12, the power transmission shaft 13, and the bearing portion 14 that are disposed inside. Moreover, it also acts as a structural member that supports the load in the axial direction when the linear motion device A operates. Therefore, the housing 10 is formed of a cylindrical body (for example, made of metal such as iron or aluminum alloy) having a sufficient thickness that can obtain strength.

The motor 11 is disposed inside the housing 10 so as to be coaxial with the housing 10, that is, the output shaft 111 rotates around the central axis of the housing 10. The motor 11 can employ a wide range of electric motors such as a DC motor and an AC motor. The motor 11 can be determined according to the operating conditions such as the installation location of the linear motion device A and the size and weight of the operation target. For example, when the linear motion device A is used when opening and closing the door of an automobile, the automobile is equipped with a DC power source, and thus a DC motor is preferable.

The motor 11 is held (fixed) so as not to rotate in the housing 10 and to move in the axial direction in order to reduce output loss from the output shaft 111. Note that the motor 11 may be firmly fixed to the housing 10 so as not to move, and the rotation around the axis is suppressed by using a key, a spline, etc., and a step is formed inside the housing 10 to form an axial direction. You may make it regulate movement of. For mounting the motor 11 to the housing 10, it is possible to widely adopt a method for suppressing rotation around the axis of the motor 11 relative to the housing 10 and movement in the axial direction.

The gear box 12 is also held in the housing 10 like the motor 11. The gear box 12 includes a plurality of gears therein, and one end is an input side and the other end is an output side. An output shaft 111 of the motor 11 is connected to the input side of the gear box 12, and a power transmission shaft 13 is connected to the output side. As shown in FIG. 1, the gear box 12 connects the output shaft 111 of the motor 11 and the power transmission shaft 13 so that the axes of both shafts coincide. The gear box 12 decreases (decelerates) the rotation speed input from the input side, and increases (amplifies) the rotational force (torque) to output from the output side.

In the linear motion apparatus A, when the output (rotation) of the output shaft 111 of the motor 11 is transmitted to the power transmission shaft 13, the gear box 12 transmits the output by decreasing the rotational speed and increasing the torque. In addition, since the gear box 12 is provided, a motor (generally a small motor) having a small generated torque can be adopted as the motor 11 of the linear motion device A. When the motor 11 is capable of generating sufficient torque at low speed, the gear box 12 is omitted and the output shaft 111 and the power transmission shaft 13 are directly connected, or the power transmission shaft 13 is connected to the output shaft 111. A configuration may also be used. The gear box 12 also has an effect as a buffer member that suppresses the axial force input from the power transmission shaft 13 from acting on the motor 11.

One end in the axial direction of the power transmission shaft 13 is connected to the gear box 12 and the other end is rotatably supported by the bearing portion 14. The power transmission shaft 13 is arranged so that the rotation shaft overlaps the central axis of the housing 10 and is supported by the bearing portion 14, so that the shaft is less likely to shake during rotation. The power transmission shaft 13 protrudes from the power unit 1, and the tip thereof is connected to the sleeve screw 22 of the actuator 2. The power transmission shaft 13 and the sleeve screw 22 are coupled so as not to rotate relatively.

The bearing portion 14 includes a main body portion 141 fitted to an axial end portion of the housing 10 and a bearing 142 disposed at the center of the main body portion 141. In the linear motion device A shown in FIG. 1, a radial bearing is adopted as the bearing 142. As shown in FIG. 1, when the power transmission shaft 13 rotates, the power transmission shaft 13 is supported by the gear box 12 at one end and the bearing portion 14 at the other end. Shaking of the shaft is suppressed.

And the rotation support part 15 is attached to the edge part on the opposite side to which the front-end | tip of the power transmission shaft 13 of the housing 10 protrudes. The rotation support portion 15 is a plate-like member protruding in the axial direction of the housing 10, and a through hole is formed in the central portion. A pin or a screw is passed through the through hole, and the power unit 1, that is, the linear motion device A as a whole is attached to a support object (for example, a car body of an automobile) so as to be rotatable about the through hole. In addition, as a rotation support part 15, it is possible to employ | adopt widely structures, such as a ball socket joint, a clevis, and a pin joint.

The actuator 2 moves on the guide case 21, the sleeve screw 22 disposed in the guide case 21 so as not to contact the guide case 21, and the spiral groove 221 formed on the outer periphery of the sleeve screw 22. And a cylindrical interlocking member 24 that holds the nut member 23 and is arranged inside the guide case 21 so as to be slidable in the axial direction.

The guide case 21 is a cylindrical member, and is the exterior of the actuator 2 and the exterior of the linear motion device A. A sleeve screw 22 is disposed inside the guide case 21, and the sleeve screw 22 rotates so as not to contact the guide case 21.

One end portion of the guide case 21 is firmly connected to the housing 10 of the power unit 1. In the linear motion device A shown in FIG. 1, the end of the guide case 21 is fixed by caulking the housing 10. The connection method is not limited to this. For example, a female screw is formed on the inner side of the guide case 21 and a male screw is formed on the outer side of the housing 10. The screw is fixed by screwing, or by a joining method such as welding. It is possible to widely adopt a method in which the power unit 1 and the actuator 2 can be connected so that the central axes do not shift. In addition, when the member arrange | positioned inside the motive power part 1 and the actuator 2 can be arrange | positioned accurately, you may form the housing 10 and the guide case 21 integrally.

The sleeve screw 22 is a cylindrical member whose one end is closed. The sleeve screw 22 is formed in a spiral groove (male screw) 221 formed in the outer peripheral portion of the cylinder and in the closed portion. A connecting portion 222 to which the tip is connected and a gas spring attaching portion 220 formed inside the cylindrical shape and to which the gas spring 3 (gas cylinder 31) is attached are provided.

Here, the spiral groove 221 is a male screw and a right-hand screw. A female thread-shaped spiral groove 231 formed in the nut member 23 is screwed into the male thread-shaped spiral groove 221. The connecting portion 222 is connected to the power transmission shaft 13 so as not to rotate relative to the power transmission shaft 13. In addition, the connection part 222 and the power transmission shaft 13 are connected by forming a concave hole of a shape other than a circle in the spline or the connection part 222 and forming the tip of the power transmission shaft 13 in the same shape as the concave hole. It is possible to employ a wide variety of shapes that can reliably transmit the rotation of the power transmission shaft 13 to the sleeve screw 22, such as an insertion configuration, a key, and a key groove. The connecting part 222 may be provided with a reinforcing plate for receiving the axial force of the power transmission shaft 13. Thus, the connection part 222 and the power transmission shaft 13 are connected, whereby the rotation of the power transmission shaft 13 is transmitted to the connection part 222 and the sleeve screw 22 rotates. Details of the movement will be described later.

At least the gas cylinder 31 of the gas spring 3 is mounted inside the gas spring mounting portion 220. The gas spring mounting portion 220 supports the gas cylinder 31 so that the gas cylinder 31 is coaxial with the sleeve screw 22. At this time, the gas spring mounting portion 220 may hold the gas cylinder 31 firmly so as not to move with respect to the sleeve screw 22 or may support it rotatably. The gas cylinder 31 is supported by the gas spring mounting portion 220 as long as the sliding direction of the piston rod 32 described later is the same as the longitudinal direction of the shaft of the sleeve screw 22, and the shaft of the piston rod 32 and the shaft of the sleeve screw 22 are sufficient. Are more preferable.

The nut member 23 is a member provided with an internally threaded spiral groove 231 inside. The female threaded spiral groove 231 is screwed into the male threaded spiral groove 221 of the sleeve screw 22. In the linear motion device A, each of the sleeve screw 22 and the nut member 23 includes a male screw 221 and a female screw 231, but is not limited thereto. As described above, it is possible to widely adopt a configuration in which the rotation of the sleeve screw 22 can be converted into a force for moving the nut member 23 fitted on the sleeve screw 22 in the axial direction. The nut member 23 moves within a range where the spiral groove 221 of the sleeve screw 22 is formed. That is, the operation stroke of the linear motion device A is a length obtained by subtracting the length of the nut member 23 from the axial length of the portion of the sleeve screw 22 where the spiral groove 221 is formed.

The interlocking member 24 is a cylindrical member, and is attached inside the guide case 21 so as to be slidable in the axial direction of the guide case 21. Although not shown, the guide case 21 and the interlocking member 24 are provided with a rotation preventing member that prevents the interlocking member 24 from rotating with respect to the guide case 21. A nut member 23 is fitted into one end of the interlocking member 24. The interlocking member 24 and the nut member 23 do not move relative to each other. That is, the nut member 23 is connected to the end of the interlocking member 24 (in the interlocking member A of the present invention, the end on the power unit 1 side).

Since the interlocking member 24 is restricted from rotating relative to the guide case 21, the nut member 23 fixed to the interlocking member 24 is also restricted from rotating relative to the guide case 21. In this state, when the sleeve screw 22 is rotated by the power from the power unit 1, the sleeve screw 22 rotates with respect to the nut member 23. Accordingly, the nut member 23 and the interlocking member 24 to which the nut member 23 is fixed move along the axis of the sleeve screw 22 by the action of the spiral groove 221 and the spiral groove 231.

The gas spring 3 is a member that urges the force to the outside by the pressure of the gas sealed inside. A gas cylinder 31, a piston head (not shown) slidably disposed inside the gas cylinder 31, and a piston rod 32 having one end attached to the piston head and the other end protruding from the gas cylinder 31. Yes. The configuration of the gas spring 3 is well known in the art and will not be described in detail.

The gas cylinder 31 is a cylindrical member in which a gas is sealed, one end is closed, and the other end has a hole through which the piston rod 32 passes. The gas cylinder 31 is inserted into the gas spring mounting portion 223 of the sleeve screw 22 so that the end on the closed side is the back. The closed end of the gas cylinder 31 is in contact with the innermost part of the gas spring mounting portion 223. The gas cylinder 31 pushes (pulls) the piston head with the pressure of the internal gas, and an axial force acts on the piston rod 32. The tip of the piston rod 32 protruding from the gas cylinder 31 is connected to the mounting member 4 so as to be rotatable.

In the linear motion device A, the gas spring 3 has the gas cylinder 31 and the piston rod 32 outside even when the linear motion device A is in the most extended state (that is, the nut member 23 reaches the tip of the sleeve screw 22). It has a structure that urges a force toward (generates a repulsive force).

The attachment member 4 is a member attached to an operation target (for example, a rear door in the case of a vehicle) to be operated by the linear motion device A. The attachment member 4 includes a fitting portion 41 that is fitted to the tip of the interlocking member 24, an engagement portion 42 that is engaged with the above-described operation target, and a bearing 43 that rotatably supports the tip of the piston rod 32. It has.

The fitting portion 41 is a member that is fitted and fixed to the distal end of the interlocking member 24. Thereby, the attachment member 4 operates in synchronization with the interlocking member 24. In the linear motion device A, the fitting portion 41 is fixed to the interlocking member 24 by press-fitting. However, the present invention is not limited to this, and a method that can firmly fix the interlocking member 24 and the fitting portion 41 is widely adopted. be able to.

The engagement portion 42 includes an engagement hole, and a tightening tool such as a screw, a pin, and a rivet is inserted into the engagement hole, and the tightening tool is rotatably attached to the above-described operation object. By being attached in this way, the attachment member 4 is attached to the operation target so as to be rotatable about the binding tool. In the linear motion device A of the present invention, the engagement hole of the engagement portion 42 has a partially opened shape, but is not limited thereto, and may be a closed figure.

In the linear motion device A according to the present invention, the gas spring 3 is configured to push the mounting member 4 with a repulsive force. In this configuration, when the tip of the piston rod 32 is brought into direct contact with the fitting portion 41, the frictional force at the contact portion increases. For this reason, a bearing 43 (thrust bearing) is provided at a portion of the mounting member 4 where the tip of the piston rod 32 contacts. By attaching the bearing 43 in this way, wear between the tip of the piston rod 32 and the fitting portion 41 can be suppressed. In the linear motion device A, a thrust bearing is used as the bearing 43, but the present invention is not limited to this, and a radial bearing may be used. Further, the bearing 43 may be omitted by performing a surface treatment that reduces friction and wear.

Such an operation of the linear motion device A will be described with reference to the drawings. FIG. 2 is a cross-sectional view of the linear motion device shown in FIG. 1 in a long state. As an operation of the linear motion device A of the present invention, a case where the linear motion device A changes from a short state to a long state (from the state of FIG. 1 to the state of FIG. 2) will be described.

As shown in FIG. 1, in the linear motion device A, the nut member 23 is screwed with the portion of the spiral groove 221 of the sleeve screw 22 closest to the drive unit 1. At this time, most of the interlocking member 24 is inserted into the guide case 21, and only the tip portion to which the attachment member 4 is attached protrudes from the guide case 21.

In this state, the axial length between the rotation support portion 15 and the engagement portion 42, that is, the length of the linear motion device A is the shortest. As shown in FIG. 2, when the nut member 23 moves to the most distal end side of the spiral groove 221 of the sleeve screw 22, the length between the rotation support portion 15 and the engagement portion 42, that is, the linear motion device. The length of A is the longest.

As shown in FIG. 1, when the linear motion device A is in a short state, the gas spring 3 is also in a contracted state. The gas spring 3 has the gas cylinder 31 as the sleeve screw 22 and the piston rod 32 as the bearing 43. The attachment member 4 is pushed in the opposite direction along the axis.

In this state, when the motor 11 is driven, rotation (rotational force) is output from the output shaft 111. The rotation of the output shaft 111 is decelerated by the gear box 12 and the torque is amplified and transmitted to the power transmission shaft 13. Since the power transmission shaft 13 is connected to the sleeve screw 22, the rotational force output from the gear box 12 is transmitted to the sleeve screw 22 via the power transmission shaft 13. Thereby, the sleeve screw 22 is rotated.

When the sleeve screw 22 is rotated, the spiral groove 221 of the sleeve screw 22 and the spiral groove 231 of the nut member 23 slide. By the action of the spiral groove 221 and the spiral groove 231, a force along the axis acts on the nut member 23, and the nut member 23 and the interlocking member 24 to which the nut member 23 is fixed slides along the axis. Needless to say, the sliding direction of the nut member 23 and the interlocking member 24 varies depending on the rotation direction of the sleeve screw 22.

Further, the fitting portion 41 of the attachment member 4 is attached to the tip of the interlocking member 24, and the piston rod 32 connects the fitting portion 41 via the bearing 43, and the rotation support portion 15 and the engaging portion 42. It pushes in the direction of leaving, that is, the direction in which the length of the linear motion device A is increased. Thereby, the rotational force of the motor 11 and the repulsive force of the gas spring 3 act on the nut member 23 and the interlocking member 24.

The gas spring 3 is used not only for providing an auxiliary force when the nut member 23 and the interlocking member 24 are moved, but also for restricting the movement when stopped halfway. The case where the nut member 23 and the interlocking member 24 are operating against the force acting to shorten the linear motion device A will be described. When the nut member 23 and the interlocking member 24 are sliding, if the rotation from the motor 11 is not transmitted, the rotation of the sleeve screw 22 stops. At this time, the repulsive force of the gas spring 3 acts on the nut member 23 in the axial direction via the fitting portion 41 and the interlocking member 24. The gas cylinder 31 of the gas spring 3 is attached to the gas spring attachment portion 223 of the sleeve screw 22, and the axial repulsive force from the gas spring 3 is also acting on the sleeve screw 22.

That is, a force opposite to the axial direction is applied to the sleeve screw 22 and the nut member 23 by the gas spring 3. Thereby, the spiral groove 221 of the sleeve screw 22 and the spiral groove 231 of the nut member 23 are strongly pressed, and the frictional force restricts the movement of the nut member 23 relative to the sleeve screw 22.

Even when the movement cannot be restricted (when the force acting to shorten the linear motion device A is large), the repulsive force of the gas spring 3 and the spiral groove 231 of the nut member 23 and the spiral groove 221 of the sleeve screw 22 The speed of movement can be reduced by the frictional force.

When the linear motion device A becomes shorter, the operation is the same except that the rotation of the motor 11 is reversed. When the linear motion device A is shortened, the nut member 23 and the interlocking member 24 move against the repulsive force of the gas spring 3, so that the force due to the rotation of the sleeve screw 22 is larger than the repulsive force of the gas spring 3. Thus, the reduction ratios of the motor 11 and the gear box 12 are determined.

As described above, the linear motion device A of the present invention has a configuration in which at least the gas cylinder 31 of the gas spring 3 is disposed inside the sleeve screw 22, so that the external shape of the linear motion device A is reduced. In addition, since the actuator 2 and the gas spring 3 are arranged in series and the force of the actuator 2 and the gas spring 3 acting on the mounting member 4 acts in parallel, the actuator 2 and the gas spring 3 are the objects to be operated. The gas spring 3 assists the operation of the actuator 2 when the mounting member 4 is moved. Thereby, it is difficult to apply a large force to the attachment member 4 to which the actuator 2 and the gas spring 3 are attached, and the configuration of the attachment member 4 can be simplified.

Furthermore, since the gas spring 3 is arranged inside the actuator 2, the outer surface or inner surface of the gas cylinder 31 is not required to be processed with a spiral groove and the structure can be simplified. In addition, since the inner surface of the gas cylinder 31 is not required to be processed, gas leakage can be suppressed, and a decrease in the capacity of the gas spring 3 can be suppressed over a long period of time. Furthermore, since the shape of the gas spring 3 is the same as that of the conventional one, a general-purpose product can be used for the gas spring 3, and the manufacturing cost can be reduced.

The opening / closing body drive device using the linear motion device A according to the present invention will be described with reference to the drawings. FIG. 3 is a schematic view showing a rear portion of a vehicle using the opening / closing body driving apparatus according to the present invention. As shown in FIG. 3, the opening / closing body driving device Op is an apparatus that opens and closes the wq door Dr that is an opening / closing body. The opening / closing body driving device Op is provided on the linear motion device A, the door Dr at the rear of the automobile Cr, and a first support portion L1 that rotatably supports the engaging portion 42 of the mounting member 4 of the linear motion device A, The door frame Fr includes a second support portion L2 that rotatably supports the rotation support portion 15 of the linear motion device A. That is, the door Dr provided with the first support part L1 is an operation target, and the door frame Fr provided with the second support part L2 is a support object.

The upper end of the door Dr is rotatably attached to the upper end edge of the door frame Fr by a hinge Hg. When the door Dr is closed, the linear motion device A is in the shortest state. In the opening / closing body driving device Op, the length between the first support portion L1 and the hinge Hg and the length between the second support portion L2 and the hinge Hg are constant, whereas the first support portion. Since the length of L1 and the 2nd support part L2 is decided by the length of the linear motion apparatus A, when the linear motion apparatus A becomes long, the door Dr will rotate around the hinge Hg and the door Dr will open. And when the linear motion apparatus A is the longest state, the opening degree of the door Dr becomes the maximum. Further, when the linear motion device A is shortened while the door Dr is open, the door Dr is rotated in the closing direction, and when the linear motion device A is in the shortest state, the door Dr is closed.

By using the linear motion device A according to the present invention for such an opening / closing body driving device Op, when the door Dr opens, the door Dr has a gas spring 3 in addition to the direct power due to the rotational force of the motor 11. Since the repulsive force acts, the load on the motor 11 is reduced. Further, even when the rotational force of the motor 11 is weak or no longer acts, the repulsive force from the gas spring 3 acts in the direction of supporting the door Dr, so that the door Dr is prevented from closing suddenly. Can do. Thereby, since it can suppress that a user's hand and body are pinched, it is possible to improve safety.

Further, since the gas spring 3 of the linear motion device A is arranged coaxially with the actuator 2 and inside the actuator 2, the external shape of the linear motion device A is reduced. Therefore, since the opening / closing body driving device Op can be reduced in size, the structure of the door Dr and the door frame Fr can be simplified.

As mentioned above, although embodiment of this invention was described, this invention is not limited to this content. The embodiments of the present invention can be variously modified without departing from the spirit of the invention.

The present invention can be used as a driving device for opening and closing an opening / closing body such as a door of an automobile.

DESCRIPTION OF SYMBOLS 1 Power part 11 Motor 12 Gear box 13 Power transmission shaft 14 Bearing part 15 Rotation support part 2 Actuator 21 Guide case 22 Sleeve screw (long member)
221 Spiral groove (Male thread shape)
222 connecting part 220 gas spring attaching part 3 gas spring 31 gas cylinder 32 piston rod 4 attaching member 41 fitting part 42 engaging part 43 bearing

Claims

An actuator having a long member having a spiral groove and a nut member moving on the groove; a gas spring disposed coaxially with the actuator; and an attachment member attached to an object.
The mounting member is connected to the nut member via an interlocking member so as to operate in synchronization with the nut member,
The rod of the gas spring is connected to the mounting member;
A linear motion device that moves an object by driving the actuator.
The linear motion device according to claim 1, wherein the elongate member is a cylindrical body, and the gas spring is housed inside the cylindrical body.
The linear motion device according to claim 1, wherein the attachment member is fixed to the interlocking member, and a tip end portion of the rod is connected to the attachment member via a bearing.
An opening / closing mechanism characterized in that the linear motion device according to any one of claims 1 to 3 is attached to a vehicle body side, the attachment member is attached to an opening / closing body, and the opening / closing body opens / closes when the linear motion member operates. Body drive device.