Swing door drive unit

Abstract

To provide a swing door drive unit that uses a linear motor for easily drive a swing door.SOLUTION: A swing door drive unit includes a linear motor and a link member 8. The linear motor is provided on an upper portion of a wall portion 200 on which a swing door 100 is installed so that a movable element 5 moves linearly along the left-right direction of the wall portion 200. The link member 8 is supported at its one end 9 on the side of the wall portion 200 for rotation about an axis in the vertical direction, and the other end 11 is supported on the side of the swing door 100 for movement relatively to the swing door 100. The link member 8 has a cam groove 12. A cam pin 15 as an engagement portion is fitted into the cam groove 12. As the movable element 5 moves, the cam pin 15 moves along the cam groove 12. As the cam pin 15 moves, the link member 8 rotates. The rotation of the link member 8 causes the swing door 100 to rotate.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a hinged door drive unit that drives a hinged door that rotates around an axis in the vertical direction. [Background technology]

[0002] Patent Document 1 below proposes a device for driving a swing door. In the device of Patent Document 1, a linear motor is attached to a stationary member of the door (swinging door). A rotor plate (movable member) of the linear motor is attached to a frame or chassis attached above the door. A roller pin attached to the door is engaged with a cam groove provided in the rotor plate. Then, as the rotor plate moves left and right of the stationary member, the roller pin moves in the cam groove, and the swinging door rotates in accordance with this movement. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 46-29 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the technology of Patent Document 1, the distance between the rotation axis of the hinged door and the point where the driving force of the linear motor acts on the hinged door (the position of the roller pin) is short, so the hinged door cannot be opened or closed unless the driving force of the linear motor is increased.

[0005] Therefore, an object of the present invention is to provide a hinged door drive unit that can easily drive a hinged door using a linear motor. [Means for solving the problem]

[0006] The hinged door drive unit of the present invention comprises: A linear motor is attached to an opening member that forms an opening that is opened and closed by the hinged door, and has a movable element that is linearly movable along the left-right direction of the opening, and drives the movable element; A link member having a cam groove, one end of which is supported on the side of the opening member so as to be rotatable around an axis in the vertical direction, and the other end of which is supported on the side of the hinged door so as to be movable relative to the hinged door; A support portion attached to the hinged door and supporting the other end of the link member so as to be movable relative to the hinged door; an engagement portion supported by the movable member and engaged with the cam groove, As the movable member moves linearly, the engaging portion moves along the cam groove, and as the engaging portion moves, the link member rotates around the axis while causing relative movement between the other end and the hinged door, and as the link member rotates, the hinged door rotates.

[0007] According to this, the link member is rotated by the movement of the mover of the linear motor, and the rotation moment of the link member is applied to the hinged door, thereby rotating the hinged door. This makes it easier to drive the hinged door. [Brief description of the drawings]

[0008] [Figure 1] 2 is a front view of a hinged door provided in a wall portion and a hinged door drive unit that drives the hinged door. FIG. [Diagram 2] FIG. 2 is an enlarged view of part A in FIG. [Diagram 3] FIG. 2 is a diagram showing the hinged door, the hinged door drive unit, and the wall portion from above, with the hinged door in a closed state. [Figure 4] 1 is a diagram showing the hinged door, the hinged door drive unit, and the wall portion as viewed from above, illustrating a state in which the hinged door is in the middle of opening or closing. FIG. [Diagram 5] FIG. 2 is a diagram showing the hinged door, the hinged door drive unit, and the wall portion from above, with the hinged door in an open state. [Figure 6] FIG. 2 is a perspective view of the hinged door, the hinged door drive unit, and the wall portion, in a state where the hinged door is closed. [Figure 7] 1 is a perspective view of a hinged door, a hinged door drive unit, and a wall portion, showing a state in which the hinged door is in the middle of opening or closing. FIG. [Figure 8] FIG. 2 is a perspective view of a hinged door, a hinged door drive unit, and a wall portion, showing the hinged door in an open state. [Figure 9] FIG. 2 is a diagram illustrating the hinged door drive unit and the hinged door of the embodiment as viewed from above, and is a diagram for explaining the definition of each variable or constant for calculating the thrust of the linear motor. [Figure 10] 13 is a diagram showing a hinged door drive unit and a hinged door of a comparative example, as viewed from above. FIG. [Figure 11] FIG. 11 is a diagram showing the relationship between the movement amount (linear movement amount) of a mover and thrust force in an example and a comparative example. [Figure 12] FIG. 11 is a diagram showing the relationship between the movement amount (linear movement amount) of a mover and the rate of change of thrust force in an embodiment and a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A hinged door 100 shown in FIG. 1 is attached to a wall 200 as an opening member that divides a space so as to be rotatable about a rotation axis L1 facing in the up-down direction. The rotation axis L1 is set near one end 100a of the hinged door 100 in the left-right direction. The hinged door 100 opens and closes an opening 201 (see also FIGS. 3 to 5, 7, and 8) formed by the wall 200 by rotating about the rotation axis L1. The hinged door 100 is attached to the wall 200 by an attachment part 202 (see FIG. 7) that defines the rotation axis L1. The attachment part 202 is attached, for example, to the upper and lower parts of one end 100a of the hinged door 100 in the left-right direction. The hinged door 100 opens toward the back side of the paper surface of FIG. 1. 3 to 5, the hinged door 100 rotates clockwise around the center O at the position of the rotation axis L1 when opening, and rotates counterclockwise when closing. In addition, in Fig. 3 to 5, a linear motor 2 (movable element 5) described below, which is located above a link member 8 described below, is shown by imaginary lines. Also, the wall portion 200 is shown as a cross section taken below the link member 8 and the support portion 13.

[0010] As shown in FIG. 1, a hinged door drive unit 1 (hereinafter, sometimes simply referred to as a unit) that automatically rotates the hinged door 100 is provided. The unit 1 is, for example, retrofitted to the existing hinged door 100 and wall section 200. As shown in FIG. 2, the unit 1 includes a linear motor 2. The linear motor 2 is a device that obtains a thrust in a linear direction by utilizing attraction and repulsion of magnets. Here, as shown in FIG. 3, of both surfaces 200a, 200b of the wall section 2, the surface 200a facing the opening direction A side of the hinged door 100 is defined as a first surface, and the surface 200b facing the opposite side of the opening direction A is defined as a second surface. The linear motor 2 is configured so that it can be retrofitted to a position above the opening 201 on the second surface 200b by screws or the like.

[0011] 2 shows a front view of the linear motor 2, with portions 3 to 7 inside the housing 3 of the linear motor 2 indicated by dashed lines. As shown in FIG. 2, the linear motor 2 is configured to include the housing 3, a stator 4, a mover 5, rollers 6, and rails 7. The housing 3 is formed in an elongated shape, and houses the stator 4, the mover 5, the rollers 6, and the rails 7. The housing 3 is attached to the wall 200 with screws or the like so that the longitudinal direction faces the left-right direction (frontage direction) of the opening 201.

[0012] The stator 4 is provided at a position facing the mover 5 with a gap therebetween, and generates a magnetic pole at the position facing the mover 5. The stator 4 is composed of, for example, a plurality of electromagnets. These electromagnets are arranged in the housing 3 along the longitudinal direction of the housing 3. Each electromagnet is composed of a coil, an iron core, etc., and switches the magnetic pole on the mover 5 side to an N pole or an S pole depending on the direction of the current flowing through the coil. The stator 4 (each electromagnet) is arranged along the left-right direction of the opening 201 with the linear motor 2 attached to the wall 200. The position of the stator 4 is fixed, that is, the stator 4 does not move regardless of the movement of the mover 5 and the opening and closing operation of the hinged door 100.

[0013] The mover 5 is provided at a position facing the stator 4 with a gap therebetween, and generates a magnetic pole at the position facing the stator 4. The mover 5 is composed of, for example, a plurality of permanent magnets. These permanent magnets are arranged inside the housing 3 along the longitudinal direction of the housing 3. The mover 5 (permanent magnets) is configured so that N poles and S poles appear alternately along the longitudinal direction of the housing 3. The mover 5 is arranged along the left-right direction of the opening 201 with the linear motor 2 attached to the wall 200.

[0014] The mover 5 is provided so as to be linearly movable along the longitudinal direction of the housing 3. In other words, the mover 5 is provided so as to be linearly movable along the left-right direction of the opening 201 in a state where it is attached to the wall 200. Specifically, a roller 6 is attached to, for example, the lower surface of the mover 5. In addition, a rail 7 for guiding the roller 6 is provided along the longitudinal direction of the housing 3.

[0015] The mover 5 moves in a first direction (specifically, to the right on the paper surface of FIG. 2) in the left-right direction of the opening 201, or moves in a second direction opposite to the first direction (specifically, to the left on the paper surface of FIG. 2) based on attraction or repulsion with respect to the stator 4. The first direction is the moving direction of the mover 5 when the hinged door 100 is opened. The second direction is the moving direction of the mover 5 when the hinged door 100 is closed.

[0016] The unit 1 includes a link member 8 driven by a linear motor 2. The link member 8 is provided at a position facing the upper part of the surface 100c on the opposite side of the hinged door 100 in the opening direction A (see FIG. 3). The link member 8 is formed in a longitudinal plate shape. The link member 8 is configured to be retrofitted so as to connect between the wall part 200 and the hinged door 100. In detail, as shown in FIG. 2, a rotating shaft 9 is attached to one end in the longitudinal direction of the link member 8. The rotating shaft 9 is provided so that its central axis faces the up-down direction. The rotating shaft 9 is provided at a position different from the rotation axis L1 (see FIG. 1) of the hinged door 100. The rotating shaft 9 is supported by a shaft support part 10. The shaft support part 10 is supported by a housing 3 of the linear motor 2. The link member 8 is provided so as to be rotatable around the axis of the rotating shaft 9. In this manner, one end of the link member 8 is supported by the wall part 200 via the rotating shaft 9, the shaft support part 10, and the housing 3.

[0017] A pin 11 is attached to the other longitudinal end of the link member 8 (the end opposite to where the rotation shaft 9 is provided). The pin 11 is provided so that its central axis faces the vertical direction. The pin 11 is provided so as to be rotatable around its own central axis. The pin 11 and the end of the link member 8 to which it is attached are supported on the side of the hinged door 100 and provided so as to be movable relative to the hinged door 100.

[0018] Specifically, the unit 1 includes a support portion 13 that supports the pin 11. The support portion 13 is configured so as to be attachable to the hinged door 100 afterwards. The support portion 13 is attached to an upper portion of a surface 100c of the hinged door 100 on the opposite side of the opening direction A (see FIG. 3) with a screw or the like. In FIG. 3, of both ends 100a and 100b in the left-right direction of the hinged door 100, the end portion 100a on the side of the rotation center O (rotation axis L1 (see FIG. 1)) of the hinged door 100 is defined as the base end of the hinged door 100, and the end portion 100b on the opposite side is defined as the tip end of the hinged door 100. The support portion 13 is attached to a position closer to the tip end 100b than the base end 100a in the left-right direction of the hinged door 100.

[0019] 3 to 5, a longitudinal guide groove 14 is formed in the support part 13. The guide groove 14 is formed so as to penetrate the support part 13 in the up-down direction. The guide groove 14 extends parallel to the left-right direction of the hinged door 100 in a state in which the support part 13 is attached to the hinged door 100.

[0020] The pin 11 is fitted into the guide groove 14 and is provided so as to be movable along the guide groove 14. The pin 11 is provided so as not to be movable relative to the hinged door 100 in any direction other than the direction along the guide groove 14. In this manner, the pin 11 and the end of the link member 8 to which it is attached are provided so as to be slidable in the left-right direction of the hinged door 100 along the surface 100c of the hinged door 100, relative to the hinged door 100.

[0021] Hereinafter, the rotation shaft 9 may be referred to as the base end of the link member 8. Also, the pin 11 may be referred to as the tip end of the link member 8. The positions of the base end 9 and the tip end 11 of the link member 8 will be described in more detail. As shown in FIG. 3, when the hinged door 100 is closed, the base end 9 is provided at a position closer to the base end 100a than the tip end 100b of the hinged door 100 in the left-right direction B of the wall portion 200 or the left-right direction C of the hinged door 100. As shown in FIGS. 3 to 5, the base end 9 is provided at a position closer to the center side in the left-right direction B of the opening 201 (the left side of the paper of FIGS. 3 to 5) than the rotation center O of the hinged door 100. Also, when the hinged door 100 is closed (the state of FIG. 3), the base end 9 is provided at a position farther from the surface 100c than the tip end 11 in the normal direction D of the surface 100c of the hinged door 100. That is, when the hinged door 100 is in a closed state, the distance between the surface 100c and the base end 9 is greater than the distance between the surface 100c and the tip end 11.

[0022] In addition, when an imaginary line L2 connecting the base end 9 and the tip end 11 is defined as a longitudinal line of the link member 8, the longitudinal line L2 extends in a direction having an angle with respect to a surface 100c of the hinged door 100 when the hinged door 100 is in a closed state (the state in FIG. 3). The longitudinal line L2 is positioned approximately parallel to the surface 100c when the hinged door 100 is in a fully open state (the state in FIG. 5). In other words, the angle between the longitudinal line L2 and the surface 100c when the hinged door 100 is in a fully open state is smaller than the angle when the hinged door 100 is in a closed state.

[0023] The tip 11 of the link member 8 is disposed near the tip 100b of the hinged door 100 when the hinged door 100 is closed (as shown in FIG. 3). The tip 11 is disposed at a position closer to the tip 100b than the base end 100a of the hinged door 100 in the left-right direction C of the hinged door 100 even when the hinged door 100 is fully open (as shown in FIG. 5). Moreover, the tip 11 may be located at one end 14a of the guide groove 14 when the hinged door 100 is closed as shown in FIG. 3. The tip 11 may be located at the other end 14b of the guide groove 14 when the hinged door 100 is fully open as shown in FIG. 5.

[0024] The distance between the tip 11 and the base end 9 is, for example, greater than 0.5 times the left-right width of the hinged door 100, and preferably greater than 0.7 times. This allows the rotation moment acting on the hinged door 100 from the link member 8 to be large. Also, the distance between the tip 11 and the base end 9 may be, for example, smaller than the left-right width of the hinged door 100. This prevents the link member 8 from becoming too large, and allows the unit 1 to be made smaller in size.

[0025] As shown in Figs. 3 to 5, the link member 8 has a cam groove 12. The cam groove 12 is a groove for converting the linear thrust of the linear motor 2 into a rotational motion about the rotation shaft 9. The cam groove 12 is formed in a form penetrating between the upper and lower surfaces of the link member 8. The cam groove 12 is formed in a longitudinal shape along the longitudinal direction of the link member 8. The cam groove 12 is formed so as to extend in the horizontal direction (a direction perpendicular to the up-down direction) when the link member 8 is supported by the wall portion 200 and the hinged door 100.

[0026] The first end 12a of the cam groove 12 in the longitudinal direction may be provided at a position closer to the base end 9 than the tip 11 of the link member 8. The second end 12b of the cam groove 12 in the longitudinal direction may be provided at a position closer to the tip 11 than the base end 9. The distance between the first end 12a and the base end 9 may be smaller than the distance between the second end 12b and the tip 11. The distance between the tip 11 and the first end 12a may be smaller than the distance between the tip 11 and the base end 9. The distance between the base end 9 and the second end 12b may be smaller than the distance between the base end 9 and the tip 11. The length of the cam groove 12 in the longitudinal direction may be shorter than the distance between the tip 11 and the base end 9 of the link member 8, longer than the distance between the base end 9 and the first end 12a, and longer than the distance between the tip 11 and the second end 12b.

[0027] The area in the upper surface of the link member 8 is divided by the longitudinal line L2 into a first area closer to the surface 100c of the hinged door 100 and a second area on the opposite side. In this case, the first end 12a may be provided in the second area, for example. The second end 12b may be provided on the longitudinal line L2 or in the vicinity of the longitudinal line L2. Most of the cam groove 12 may be located in the second area.

[0028] The cam groove 12 extends in a curved shape. More specifically, the cam groove 12 is composed of only curved portions in the entire section from the first end 12a to the second end 12b, and does not include straight portions. The cam groove 12 is formed in an arc shape with a constant curvature. That is, the curvature of the cam groove 12 does not change between the first end 12a and the second end 12b. Here, among the edges extending in the longitudinal direction of the link member 8, the edge 8a (see FIG. 4) farther from the hinged door 100 is defined as the distal edge. The cam groove 12 is formed in an arc shape that bulges toward the distal edge 8a side from a virtual straight line (not shown) connecting the first end 12a and the second end 12b. The cam groove 12 is formed so that the distance from the longitudinal line L2 gradually changes from the first end 12a to the second end 12b. More specifically, in this embodiment, the distance between the first end 12a and the longitudinal line L2 is greater than the distance between the second end 12b and the longitudinal line L2. The distance between the cam groove 12 and the longitudinal line L2 gradually decreases, for example, toward the second end 12b.

[0029] The shape of the cam groove 12 is determined so that the angle φ (see FIG. 4) between the moving direction of the mover 5 and the extending direction of the cam groove 12 becomes larger as the distance between the cam pin 15 and the rotation shaft 9 described later becomes smaller. More specifically, the angle φ when the cam pin 15 is located near the first end 12a of the cam groove 12 (as shown in FIG. 5) is larger than the angle φ when the cam pin 15 is located near the second end 12b (as shown in FIG. 3). The angle φ when the cam pin 15 is located near the first end 12a of the cam groove 12 (as shown in FIG. 5) is determined to be approximately 90°. The angle φ gradually becomes larger as the hinged door 100 opens. The distance between the cam pin 15 and the rotation shaft 9 gradually becomes smaller as the hinged door 100 opens.

[0030] The cam groove 12 may have a shape other than that shown in Figs. 3 to 5. Specifically, the portions of the cam groove 12 near the ends 12a and 12b are defined as the end vicinity portions, and the portions other than the end vicinity portions are defined as the intermediate portion. In this case, for example, the intermediate portion of the cam groove 12 may be an arc shape with a constant curvature, and the end vicinity portions may be curved or straight portions with a different shape or curvature from the intermediate portion. The cam groove 12 may be composed of a plurality of curved portions with different curvatures, or may be composed of a plurality of straight portions with different inclinations. The cam groove 12 may have a shape including both curved portions and straight portions.

[0031] The unit 1 includes a cam pin 15 (see Figs. 2 to 8) as an engagement portion that engages with the cam groove 12. The cam pin 15 is fitted into the cam groove 12. The cam pin 15 is provided so as to be rotatable about an axis in the vertical direction. As shown in Fig. 2, the cam pin 15 is supported by a support portion 16. As shown in Figs. 3 and 6, the support portion 16 includes a first portion 16a extending in the vertical direction and a second portion 16b bent at a right angle from the lower end of the first portion 16a and extending in the horizontal direction. The first portion 16a is located outside the opening 201 in a direction perpendicular to the surfaces 200a and 200b of the wall portion 200. The second portion 16b is provided so as to enter from the outside to the inside of the opening 201 in a direction perpendicular to the surfaces 200a and 200b of the wall portion 200. The first portion 16a is supported by a mover 5 of the linear motor 2. The cam pin 15 is attached to the second portion 16b. The support portion 16 and the cam pin 15 supported thereby move linearly in the left-right direction of the opening 201 as the mover 5 moves.

[0032] As shown in Fig. 3, the cam pin 15 is provided at a position closer to the second end 12b of the cam groove 12 when the hinged door 100 is closed. The cam pin 15 is provided at a position closer to the tip 11 than the base end 9 of the link member 8 when the hinged door 100 is closed. Also, as shown in Fig. 5, the cam pin 15 is provided at a position closer to the first end 12a of the cam groove 12 when the hinged door 100 is fully open. The cam pin 15 is provided at a position closer to the base end 9 than the tip 11 of the link member 8 when the hinged door 100 is fully open.

[0033] The unit 1 includes a control unit 17 (see FIG. 2) that controls the magnetic poles and magnetic force of the stator 4 of the linear motor 2. When the hinged door 100 is opened, the control unit 17 controls the magnetic poles of the stator 4 so that the mover 5 moves in a first direction (specifically, to the right in FIG. 2). When the hinged door 100 is closed, the control unit 17 controls the magnetic poles of the stator 4 so that the mover 5 moves in a second direction opposite to the first direction (specifically, to the left in FIG. 2). The control unit 17 also controls the current supplied to the stator 4 to control the magnetic force of the stator 4, and thus the propulsive force of the mover 5. The control unit 17 may be provided inside or outside the housing 3 of the linear motor 2.

[0034] Furthermore, the unit 1 includes a detection unit 18 that detects the operation timing of the hinged door 100. The detection unit 18 may be, for example, a human sensor such as a camera or an infrared sensor that detects a person approaching the hinged door 100. Alternatively, the detection unit 18 may be configured to include an opening / closing switch (operation unit) that outputs a signal instructing the opening or closing operation of the hinged door 100. In this case, the detection unit 18 outputs a signal (a signal instructing the opening operation or the closing operation) based on the operation of the opening / closing switch to the control unit 17. The opening / closing switch may be configured as a wireless unit (remote control) that wirelessly transmits a signal instructing the opening or closing operation to the control unit 17, or may be connected to the control unit 17 by wire.

[0035] The operation of the unit 1 will be described below. When the control unit 17 determines that the conditions for executing the opening operation are satisfied based on the detection unit 18, it controls the current to the stator 4 to move the movable member 5 to the right from the state shown in FIG. 3. The control unit 17 may determine that a person is approaching the hinged door 100, or may determine that a signal instructing the opening operation has been received, as the conditions for executing the opening operation are satisfied. As shown in FIG. 3, FIG. 4, and FIG. 5, as the movable member 5 moves to the right, the cam pin 15 moves along the cam groove 12 in a direction approaching the first end 12a of the cam groove 12. As the cam pin 15 moves, the link member 8 moves the tip 11 along the guide groove 14 in a direction approaching the base end 100a of the hinged door 100, and rotates around the rotation shaft 9 in a clockwise direction on the paper surface of FIG. 4. As the link member 8 rotates, the hinged door 100 rotates around the rotation center O in a clockwise direction on the paper surface of FIG. 4. When the hinged door 100 is in a fully open state (the state shown in FIG. 5), the control unit 17 stops the power supply to the stator 4 and stops the mover 5. In this way, the hinged door 100 automatically opens.

[0036] When the control unit 17 determines that the execution condition for the closing operation is satisfied based on the detection unit 18, it controls the current to the stator 4 to move the movable member 5 to the left from the state shown in FIG. 5. The control unit 17 may determine that the execution condition for the closing operation is satisfied when there is no person around the opening 201, when a signal instructing the closing operation is received, or when a predetermined time has elapsed since the hinged door 100 is opened. As shown in FIG. 5, FIG. 4, and FIG. 3, as the movable member 5 moves to the left, the cam pin 15 moves along the cam groove 12 in a direction approaching the second end 12b of the cam groove 12. As the cam pin 15 moves, the link member 8 moves the tip 11 along the guide groove 14 in a direction approaching the tip 100b of the hinged door 100, and rotates in a counterclockwise direction on the paper surface of FIG. 4 around the rotation axis 9. As the link member 8 rotates, the hinged door 100 rotates in a counterclockwise direction on the paper surface of FIG. 4 around the rotation center O. When the hinged door 100 is in a completely closed state (the state shown in FIG. 3), the control unit 17 stops the power supply to the stator 4 and stops the mover 5. In this way, the hinged door 100 automatically closes.

[0037] The effects of this embodiment will be described below. In this embodiment, the hinged door 100 is opened and closed by the linear motor 2, so that it is possible to realize high quietness and smooth opening and closing compared to the case of opening and closing by a rotary motor. In addition, since the rotation moment of the link member 8 is applied to the hinged door 100, the hinged door 100 can be rotated without excessively increasing the driving force (propulsion force) of the linear motor 2. In particular, the tip 11 of the link member 8 is provided at a position closer to the tip 100b than to the base end 100a of the hinged door 100, and the distance between the tip 11 and the base end 9 of the link member 8 is greater than 0.5 times the left-right width of the hinged door 100, so that the rotation moment applied from the link member 8 to the hinged door 100 can be increased, and thus the driving force of the linear motor 2 can be reduced. By reducing the driving force of the linear motor 2, the linear motor 2 can be prevented from becoming large.

[0038] In addition, since the cam groove 12 is formed in a shape including a curved portion, it is easy to control the rotation torque of the hinged door 100 or the thrust of the movable member 5 by adjusting the position, curvature, etc. of the curved portion. In addition, since the cam groove 12 is formed in a curved shape (arcuate shape) with a constant curvature over the entire section, the cam groove 12 can be easily formed. In addition, as shown in the embodiment described later, when the thrust of the movable member 5 is controlled so that the rotation torque of the hinged door 100 is constant, it is possible to reduce the fluctuation in the rate of change of the thrust with respect to the amount of movement of the movable member 5. EXAMPLES

[0039] The following verification was carried out on the relationship between the shape of the cam groove and the thrust of the linear motor. FIG. 9 shows a plan view of the hinged door drive unit in the embodiment of the present invention. The structure of the hinged door drive unit in FIG. 9 is the same as that shown in FIG. 1 to FIG. 8, and the same reference numerals are used for each part in the structure in FIG. 9 as those in FIG. 1 to FIG. 8. The relationship between the movement amount of the movable element 5 and the thrust F was obtained when the thrust F of the movable element 5 was controlled so that the rotation torque t (hereinafter sometimes referred to as door torque) of the hinged door 100 was constant (specifically, t=2 N·m) regardless of the movement amount of the movable element 5. Specifically, the thrust F relative to the movement amount (position) of the movable element 5 was obtained based on the following formula 1. t={(FLsinθ) / s}·cosμ·l ···(Equation 1)

[0040] FIG. 9 shows variables or constants used in formula 1. Specifically, t is the torque (door torque) acting on the rotation axis O of the hinged door 100 (hereinafter, sometimes referred to as the door rotation axis). l is the distance between the tip 11 of the link member 8 and the door rotation axis O. F is the thrust of the mover 5. L is the distance between the cam pin 15 and the rotation axis 9 of the link member 8. θ is the angle between an imaginary line connecting the rotation axis 9 and the cam pin 15 and an imaginary line extending from the rotation axis 9 to the end 201a side (left side in FIG. 9) on the opposite side where the door rotation axis O is provided in the left-right direction of the opening 201. μ is the angle between an imaginary line connecting the tip 11 of the link member 8 and the rotation axis 9 and an imaginary line connecting the tip 11 and the door rotation axis O. s is the distance between the tip 11 and the rotation axis 9.

[0041] The distance s is a constant value regardless of the position of the mover 5, specifically, s = 61.81 mm. The angles θ, μ and the distances l, L change according to the position of the mover 5 as shown in Table 1 below. Table 1 shows the thrust F with respect to the position of the mover 5 when the door torque t = 2 N m. In Table 1, the linear movement amount indicates the movement amount of the mover 5 from a predetermined origin in the left-right direction of the opening 201. A linear movement amount = 0 mm indicates the position of the mover 5 where the hinged door 100 is fully closed. A linear movement amount = 380 mm indicates the position of the mover 5 where the hinged door 100 is fully open. Table 1 also shows the door opening angle, which is the opening and closing angle of the hinged door 100.

[0042] [Table 1]

[0043] As shown in Table 1, the angle θ gradually increases as the linear movement amount increases. The distance L gradually decreases as the linear movement amount increases. The angle μ gradually increases as the linear movement amount increases, and conversely decreases from a certain point (after the linear movement amount exceeds 330 mm). The distance l gradually decreases as the linear movement amount increases. The thrust force F gradually increases as the linear movement amount increases. The minimum value of the thrust force F is about 28 N, and the maximum value is about 46 N. The ratio of the maximum value to the minimum value of the thrust force F (= maximum value / minimum value) is about 1.6. In this way, when the thrust force F is controlled so that the door torque t is constant, it can be said that the structure of the hinged door drive unit 1 (the shape of the link member 8, the shape of the cam groove 12, the position of the rotation axis 9 of the link member 8, etc.) is determined so that the ratio of the maximum value to the minimum value of the thrust force F is 2 or less.

[0044] As a comparative example, the thrust force versus the position of the mover was also obtained when using the structure shown in Fig. 10. In the structure in Fig. 10, the same components as in Fig. 9 are given the same reference numerals. The structure in Fig. 10 differs from the structure in Fig. 9 in that cam groove 12' in link member 8 is formed in a straight line, but is otherwise the same as the structure in Fig. 9. The positions of both ends of cam groove 12' in link member 8 are the same as the positions of both ends of cam groove 12 in Fig. 9.

[0045] Table 2 and Fig. 11 show the relationship between the movement amount (linear movement amount) of the mover 5 and the thrust force F in the example and the comparative example. Fig. 11 also shows an ideal line of the thrust force F.

[0046] [Table 2]

[0047] In order to facilitate control of the mover 5, it is ideal that the rate of change of thrust F with respect to the amount of movement of the mover 5 (hereinafter sometimes referred to as thrust change rate) is constant, as shown by the ideal line in Fig. 11. In Fig. 11, the line showing the change in thrust F in the example is closer to the ideal line than the line showing the change in thrust F in the comparative example.

[0048] Furthermore, Table 3 and Fig. 12 show the relationship between the movement amount (linear movement amount) of the mover 5 and the thrust change rate in the example and the comparative example. Also, Table 4 shows the maximum value, minimum value, and difference therebetween (=maximum value-minimum value) of the thrust change rate in the example and the comparative example.

[0049] [Table 3]

[0050] [Table 4]

[0051] As shown in Table 3 and Fig. 12, in both the embodiment and the comparative example, the thrust change rate gradually increases as the linear movement amount increases. On the other hand, the fluctuation of the thrust change rate with respect to the linear movement amount is smaller in the embodiment than in the comparative example. Specifically, as shown in Table 4, the difference between the maximum and minimum values ​​of the thrust change rate in the embodiment is smaller than that in the comparative example, and is 87.2% of the difference in the comparative example. From this, it can be said that the thrust change rate of the embodiment is closer to the ideal line in Fig. 11 than that of the comparative example.

[0052] In addition, the ratio of the maximum value to the minimum value of the thrust change rate in the comparative example (=maximum value / minimum value) is approximately 33. In contrast, the ratio of the maximum value to the minimum value of the thrust change rate in the example (=maximum value / minimum value) is approximately 17, which is approximately 50% of that in the comparative example.

[0053] In this manner, in the embodiment, when the thrust F is controlled so as to keep the door torque t constant, the structure of the swing door drive unit 1 (the shape of the link member 8, the shape of the cam groove 12, the position of the rotation axis 9 of the link member 8, etc.) is determined so that the difference between the maximum and minimum values ​​of the thrust change rate is 0.2 N / mm or less (more specifically, 0.15 N / mm or less), or the ratio of the maximum value to the minimum value of the thrust change rate is 20 or less.

[0054] It should be noted that the cam grooves of the comparative example (straight-line cam grooves) have advantages such as a simple shape, and therefore straight-line cam grooves are not excluded from the scope of the present invention. [Explanation of symbols]

[0055] 1 Swing door drive unit 2. Linear motor 4 Stator 5 Mover 8 Link member 12 Cam groove 13 Support part 15 Cam pin (engagement part) 100 Swing Door 200 Wall (opening material) 201 Aperture

Claims

1. A linear motor is attached to an opening member that forms an opening that is opened and closed by the hinged door, and has a movable element that is linearly movable along the left-right direction of the opening, and drives the movable element; A link member having a cam groove, one end of which is supported on the side of the opening member so as to be rotatable around an axis in the vertical direction, and the other end of which is supported on the side of the hinged door so as to be movable relative to the hinged door; A support portion attached to the hinged door and supporting the other end of the link member so as to be movable relative to the hinged door; an engagement portion supported by the movable member and engaged with the cam groove, The engaging portion is moved along the cam groove in accordance with the linear movement of the movable member, the link member is rotated around the axis in accordance with the movement of the engaging portion while causing a relative movement between the other end and the hinged door, and the hinged door is rotated in accordance with the rotation of the link member. Swing door drive unit.

2. The hinged door drive unit according to claim 1 , wherein the cam groove is formed in a shape including a curved portion.

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