Moving amount limit device

Abstract

To provide a moving amount limit device which can easily form a structure for releasing a brake of a screw shaft by a brake part.SOLUTION: A moving amount limit device 100 of the present invention comprises a linear movement mechanism 1 including a first moving member 13 and a second moving member 14 which linearly moves in an axial direction together with the first moving member 13, and a brake part 2 for generating a brake force for stopping the rotation of a screw 11 by the abutting second moving member 14 on the basis of the movement of the first moving member 13 to one movement limit position Lp in the axial direction. Instead of screw structures, inclination faces 133 (143) extending in an inclination direction intersecting with the axial direction are formed at opposing faces 136 (145) of the first moving member 13 and the second moving member 14, respectively, in order to release a rotation stop state of the screw 11 caused by the brake part 2 by using a force which is transmitted from the brake part 2 to the second moving member 14 which has abutted thereon at a brake.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a travel limiting device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a movement amount limiting device is known (see, for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses a screw drive device (movement amount limiting device). This screw drive device includes a linear movement mechanism and a brake unit. The linear movement mechanism includes a motor, a driven screw shaft, and a moving nut assembly. The driven screw shaft rotates by motor torque transmitted from the motor. The moving nut assembly is configured to move linearly in accordance with the rotation of the driven screw shaft. The brake unit is configured to brake the rotation of the driven screw shaft when the linearly moving moving nut assembly reaches a movement limiting position.

[0004] The movable nut assembly of the above-mentioned Patent Document 1 includes an inner nut portion, an outer nut portion, and a connecting pin. An inner circumferential surface of the inner nut portion is formed with an inner thread groove that engages with a driven screw shaft. An outer circumferential surface of the inner nut portion is formed with an outer thread groove that engages with the outer nut portion. An inner circumferential surface of the outer nut portion is formed with a thread groove that engages with the outer thread groove on the outer circumferential surface of the inner nut portion. The connecting pin connects the inner nut portion and the outer nut portion.

[0005] The inner screw groove of the inner nut portion of the above-mentioned Patent Document 1 is formed with a fine pitch so that it is firmly tightened to the driven screw shaft by the load applied when the moving nut assembly and the brake portion come into contact at the movement limiting position. This maintains the state in which the moving nut assembly and the brake portion are in contact, so that the brake portion brakes the rotation of the driven screw shaft due to the load transmitted from the moving nut assembly.

[0006] Here, the outer thread groove of the inner nut part and the thread groove of the outer nut part in the above Patent Document 1 are each formed at a wider pitch than the inner thread groove of the inner nut part, so that even when the inner thread groove of the inner nut part is firmly fastened to the driven screw shaft, the inner nut part rotates integrally with the driven screw shaft along the thread groove on the inner peripheral surface of the outer nut part.

[0007] Here, in the screw driving device of the above-mentioned Patent Document 1, when the inner nut portion rotates integrally with the driven screw shaft, the connecting pin also rotates integrally with the inner nut portion. Then, the connecting pin rotates by the amount of the gap with the outer nut portion and abuts against the outer nut portion in the circumferential direction. At this time, due to the circumferential abutment, a circumferential reaction force is transmitted from the outer nut portion to the inner nut portion via the connecting pin. This circumferential reaction force is used to release the tightening of the inner screw groove of the inner nut portion against the driven screw shaft. As a result, the abutment state between the moving nut assembly and the brake unit is released, and the braking of the driven screw shaft by the brake unit is released. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Special Publication No. 57-36459 Summary of the Invention [Problem to be solved by the invention]

[0009] However, in the screw drive device of Patent Document 1, in order to release the braking of the driven screw shaft by the brake unit, a screw groove must be formed on the outer peripheral surface of the inner nut part and the inner peripheral surface of the outer nut part, which are relatively small in area and difficult to machine. Therefore, the screw drive device of Patent Document 1 has a problem that it takes time to form a structure for releasing the braking of the driven screw shaft (screw shaft) by the brake unit (releasing the rotation stop state).

[0010] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a movement limiting device that can easily form a structure for releasing the rotational stop state of the screw shaft caused by the brake section. [Means for solving the problem]

[0011] In order to achieve the above object, a movement amount limiting device in one aspect of the present invention comprises a linear movement mechanism including a screw shaft that rotates by a driving force from a motor, a guide portion extending along the axial direction of the rotation center axis of the screw shaft, a first moving member having a thread groove that engages with the screw shaft and moves linearly in the axial direction as the screw shaft rotates, and a second moving member that engages with the guide portion and moves linearly in the axial direction together with the first moving member as the screw shaft rotates, and a brake portion that generates a braking force to stop the rotation of the screw shaft by the second moving member that abuts against it based on the first moving member moving to one of the axial movement limiting positions, and the opposing surfaces of the first moving member and the second moving member that face each other in the axial direction are formed with an inclined surface that extends in an inclined direction that intersects the axial direction instead of a screw structure, in order to release the rotation stop state of the screw shaft by the brake portion by utilizing the force transmitted from the brake portion to the second moving member that abuts against it during braking. Effect of the Invention

[0012] In the movement amount limiting device according to the above aspect, the opposing surfaces of the first and second moving members facing each other in the axial direction are formed with inclined surfaces extending in an inclined direction intersecting the axial direction, instead of a screw structure, in order to release the rotation stop state of the screw shaft caused by the brake unit by utilizing the force transmitted from the brake unit to the second moving member that abuts against the first and second moving members during braking. As a result, the inclined surfaces are formed on the opposing surfaces of the first and second moving members, which are relatively easy to secure an area for and easy to process. In addition, the inclined surfaces are not structured to form a large number of relatively small inclined surfaces, as in the screw structure. As a result, in the movement amount limiting device, a structure (inclined surface) for releasing the braking of the driven screw shaft by the brake unit can be easily formed. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a schematic diagram showing a part of an aircraft system of the aircraft of the first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing the movement amount limiting device of the first embodiment. [Diagram 3] 3 is a schematic exploded perspective view of a first moving member, a ball, and a second moving member of the movement amount limiting device of the first embodiment. FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] 4 is a cross-sectional view showing a state in which a second moving member abuts on a brake portion in the movement amount limiting device of the first embodiment. FIG. [Figure 6] 6 is a cross-sectional view showing a state in which the second moving member further compresses the first biasing member in the movement amount limiting device of the first embodiment. FIG. [Figure 7] 11 is a cross-sectional view showing torque transmitted from an engagement portion to a ball ramp portion in a state in which a second moving member further compresses a first biasing member in the movement amount limiting device of the first embodiment. FIG. [Figure 8] 4 is a cross-sectional view showing a state in which the rotation stop state is released by a ball ramp portion in the movement amount limiting device of the first embodiment. FIG. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. [Figure 10] FIG. 10 is a cross-sectional view taken along line XX in FIG. [Figure 11] FIG. 11 is a schematic diagram showing a part of an aircraft system of an aircraft according to a second embodiment. [Figure 12] 11 is a cross-sectional view of a portion of a movement amount limiting device according to a second embodiment, the portion corresponding to that of FIG. 10. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0015] First, the configuration of a movement limiting device 100 according to a first embodiment of the present invention will be described with reference to Figs. 1 to 10.

[0016] [First embodiment] In FIG. 1, a movement amount limiting device 100 is provided in an aircraft system 1000 as a device that limits the movement of a control surface 500 (for example, a slat, etc.) of an aircraft Ar.

[0017] Here, the direction of travel of the aircraft Ar is the X direction, the forward direction of the X direction is the X1 direction, and the backward direction of the X direction is the X2 direction. The left-right direction of the aircraft Ar is the Y direction, the right direction of the Y direction is the Y1 direction, and the left direction of the Y direction is the Y2 direction. The up-down direction of the aircraft Ar is the Z direction, the upward direction of the Z direction is the Z1 direction, and the downward direction of the Z direction is the Z2 direction.

[0018] The aircraft system 1000 includes a movement amount limiting device 100, a motor 200, a pair of first shafts 300, a pair of second shafts 400, a plurality (four) of control surfaces 500, a plurality (eight) of actuators 600, and a control device 700. The first shaft 300 is an example of the "shaft" in the claims. The number of control surfaces 500 may be one to three, or five or more. The number of actuators 600 may be two, four, six, or ten or more, as long as they are symmetrical in a left-right pair.

[0019] The movement amount limiting device 100 is disposed at a connection between the motor 200 and the first shaft 300 on the Y1 direction side of the pair of first shafts 300. The detailed configuration of the movement amount limiting device 100 will be described later in detail.

[0020] The motor 200 is a driving source that generates a driving force for synchronously rotating the pair of first shafts 300 and the pair of second shafts 400 as a unit. The motor 200 is connected to the pair of first shafts 300. The speed of the motor 200 is changed as necessary by a reduction mechanism (not shown) or the like. The motor 200 is disposed in the fuselage of the aircraft Ar.

[0021] One of the pair of first shafts 300 extends along the Y1 direction and is connected to one of the pair of second shafts 400. One of the pair of second shafts 400 is divided into each of the multiple actuators 600 and extends in a connected state to each of the multiple actuators 600.

[0022] The other of the pair of first shafts 300 extends along the Y2 direction and is connected to the other of the pair of second shafts 400. The other of the pair of second shafts 400 is divided into each of the multiple actuators 600 and extends in a connected state to each of the multiple actuators 600.

[0023] Each of the multiple (four) control surfaces 500 has a surface that receives wind to adjust lift. The multiple actuators 600 are configured to move the control surfaces 500 by driving force transmitted from a pair of first shafts 300 and a pair of second shafts 400 rotated by the motor 200, and to hold the moved position of the control surfaces 500. Although not shown, each of the multiple actuators 600 has a speed reduction mechanism, a rotation angle sensor, a brake mechanism, and the like. As an example, two of the multiple actuators 600 are connected to one control surface 500.

[0024] The control device 700 is a flight control computer. The control device 700 is electrically connected to each of the motor 200 and the actuator 600. The control device 700 is configured to control each of the motor 200 and the actuator 600 so that the control surface 500 performs a predetermined operation.

[0025] (Travel limiting device) The movement amount limiting device 100 is configured to limit the amount of rotation of the first shaft 300 connected to the motor 200 of the aircraft Ar. In other words, the movement amount limiting device 100 is a device that prevents the first shaft 300 from being overrun by the motor 200.

[0026] 2, the movement amount restriction device 100 includes a linear movement mechanism 1, a brake unit 2, and a first biasing member 3. The first biasing member 3 is an example of the "biasing member" in the claims.

[0027] (Linear movement mechanism) The linear motion mechanism 1 is a mechanism that realizes linear motion by a motor torque Mt transmitted from a motor 200. Specifically, the linear motion mechanism 1 includes a screw 11, a guide portion 12, a first moving member 13, a second moving member 14, an engagement portion 15, and a second biasing member 16. The screw 11 is an example of a "screw shaft" in the claims. In addition, in the movement amount limiting device 100, instead of the screw 11, a screw shaft of another type, such as a ball screw, may be used.

[0028] Here, the circumferential direction around the rotation axis C of the screw 11 is defined as the R direction, one of the R directions is defined as the R1 direction, and the other of the R directions is defined as the R2 direction. The radial direction perpendicular to the extension direction of the rotation axis C is defined as the D direction, the outer side of the D direction is defined as the D1 direction, and the inner side of the D direction is defined as the D2 direction.

[0029] The screw 11 is configured to rotate in each of the R1 and R2 directions by the driving force from the motor 200, and to rotate the first shaft 300 in each of the R1 and R2 directions. The end of the screw 11 on the Y2 direction side is connected to a reduction mechanism of the motor 200. The end of the screw 11 on the Y1 direction side is connected to the first shaft 300.

[0030] The screw 11 has a spline groove 111 and a screw groove 112 .

[0031] The spline groove 111 is a groove extending along the Y direction. The spline groove 111 is formed on the Y2 direction side of the screw 11. A screw shaft side braking member 21 of the brake unit 2, which will be described later, is engaged with the spline groove 111 in the R direction so as to move linearly in each of the Y1 direction and the Y2 direction and rotate in the R1 direction and the R2 direction.

[0032] The screw groove 112 is a groove inclined in a direction intersecting the Y direction. The screw groove 112 is formed on the Y1 direction side of the screw 11. The first moving member 13 is engaged with the screw groove 112 in the Y direction so as to move linearly in each of the Y1 direction and the Y2 direction.

[0033] An engagement portion 15 is formed on the outer circumferential surface along the R direction between the spline groove 111 and the screw groove 112.

[0034] The guide portion 12 guides the movements of the first moving member 13 and the second moving member 14 in the Y1 and Y2 directions caused by the rotation of the screw 11. The guide portion 12 has a guide groove 121 extending along the Y direction (the axial direction of the rotation center axis C of the screw 11). The guide groove 121 is formed on the inner surface on the D2 direction side of the guide portion 12. The second moving member 14 moves linearly in each of the Y1 and Y2 directions and is engaged in the R direction so as not to rotate in the R1 and R2 directions.

[0035] (First moving member and second moving member) The first moving member 13 is configured to move linearly in each of the Y1 direction and the Y2 direction by rotation of the screw 11.

[0036] 3, the first moving member 13 has a main body portion 131, a screw groove 132, a plurality (three) of inclined surfaces 133, an engagement portion 134, and a ball 135. The number of inclined surfaces 133 may be one, two, or four or more.

[0037] 3 and 4, the main body 131 has a cylindrical shape. The screw groove 132 is a groove that engages with the screw 11. The screw groove 132 is inclined in a direction intersecting the Y direction to match the screw groove 112 of the screw 11.

[0038] Each of the plurality of inclined surfaces 133 is a surface that forms a conical space for holding inside the sphere 135. Each of the plurality of inclined surfaces 133 is a surface that abuts against the sphere 135 from the Y1 direction side.

[0039] The engaging portion 134 is configured to engage with the engaging portion 15 in the direction R. The ball 135 is held by the first moving member 13 and the second moving member 14.

[0040] 2, the second moving member 14 is configured to move linearly in each of the Y1 direction and the Y2 direction (axial direction) together with the first moving member 13 by rotation of the screw 11. Such a second moving member 14 is engaged with the guide portion 12 as described above.

[0041] Specifically, the second moving member 14 has a main body portion 141, a spline groove 142, a plurality (three sets) of inclined surfaces 143, and an attachment portion 144. Note that one, two, or four or more sets of inclined surfaces 143 may be provided.

[0042] 3 and 4, the main body 141 has a cylindrical shape. The spline groove 142 is a groove that engages with the guide groove 121 in the R direction. The spline groove 142 extends in the Y direction in accordance with the guide groove 121.

[0043] Each of the plurality of inclined surfaces 143 is a surface that forms a conical space for internally holding the sphere 135. Each of the plurality of inclined surfaces 143 is a surface that abuts against the sphere 135 from the Y2 direction side.

[0044] 2, the attachment portion 144 protrudes so as to cover, from the Y1 direction side, a portion of the first moving member 13 on the Y1 direction side. The attachment portion 144 is a portion for attaching the second biasing member 16 to the second moving member 14.

[0045] (Engagement portion and second biasing member) The engaging portion 15 is configured to engage with the engaging portion 134 of the first moving member 13 at the movement limiting position Lp (see FIG. 5). The engaging portion 15 and the engaging portion 134 configure an engaging dog stop. As a result, when the engaging portion 15 and the engaging portion 134 are engaged with each other, the first moving member 13 rotates integrally with the screw 11 in each of the R1 direction and the R2 direction.

[0046] The second biasing member 16 is composed of a compression spring. The second biasing member 16 biases the first moving member 13 toward the second moving member 14 in order to maintain the relative position of the first moving member 13 in the Y direction with respect to the second moving member 14. As a result, the relative positions of the first moving member 13 and the second moving member 14 are maintained at a position where the ball 135 is held therein by each of the multiple inclined surfaces 133 of the first moving member 13 and the multiple inclined surfaces 143 of the second moving member 14.

[0047] (Brake section) As shown in Figure 5, the brake unit 2 is configured to generate a braking force that stops the rotation of the screw 11 by the abutting second moving member 14 based on the movement of the first moving member 13 to the movement limiting position Lp in the Y direction.

[0048] Specifically, the brake unit 2 has a screw shaft side braking member 21 and a guide portion side braking member 22. The screw shaft side braking member 21 is attached to the spline groove 111 of the screw 11 so as to move in each of the Y1 direction and the Y2 direction. A plurality of guide portion side braking members 22 are attached to the guide groove 121 of the guide unit 12 so as to move in each of the Y1 direction and the Y2 direction. Each of the screw shaft side braking member 21 and the guide portion side braking member 22 is formed in an annular shape when viewed from the Y1 direction side. The screw shaft side braking member 21 is disposed between two guide portion side braking members 22. As a result, when the guide portion side braking member 22 moves in the Y2 direction together with the second moving member 14, the screw shaft side braking member 21 is clamped by the guide portion side braking member 22, and a braking force that brakes the rotation of the screw 11 is generated by the frictional force generated between the screw shaft side braking member 21 and the guide portion side braking member 22. As a result, the movement of the first moving member 13 in the Y2 direction stops, and the movement of the first moving member 13 in the Y2 direction is restricted at the movement restriction position Lp.

[0049] Here, each of the screw shaft side braking member 21 and the guide portion side braking member 22 has a planar braking surface along the direction D that generates a braking force by abutting against each other. The planar braking surface is a surface where the screw shaft side braking member 21 and the guide portion side braking member 22 come into contact when the screw shaft side braking member 21 is clamped by the guide portion side braking member 22.

[0050] (First biasing member) The first biasing member 3 is made of a compression spring. The first biasing member 3 is configured to be elastically deformed when the first moving member 13 moves to the movement limiting position Lp and the second moving member 14 abuts against the brake unit 2.

[0051] After the second moving member 14 abuts against the brake unit 2, as shown in Figs. 6 and 7, not only the impact force but also the stall torque of the motor 200 and the impact torque of components such as the first shaft 300 caused by the rotation of the first shaft 300 being stopped are transmitted to the first biasing member 3 as a pressing torque Trp via the screw 11, the first moving member 13, the second moving member 14, and the brake unit 2. This causes the first biasing member 3 to be further compressed. In this way, the first biasing member 3 is a buffer member that buffers not only the impact force transmitted from the second moving member 14 to the brake unit 2 when the first moving member 14 abuts against the brake unit 2 but also the stall torque. The stall torque indicates the maximum torque of the motor required to drive the device from a stopped state.

[0052] Here, in the above description, the case where the movement limiting position Lp is provided on the Y2 direction side has been described, but the movement limiting position Lp can be provided not only on the Y2 direction side but also on the Y1 direction side. The structure including the brake unit 2 at each of the movement limiting positions Lp on the Y1 direction side and the Y2 direction side may be the same structure, or a structure including the brake unit 2 may be provided only on one side, and a structure may be provided in which the impact force, the stall torque and the impact torque of the motor 200 applied to the other side are transmitted to the structure on the one side.

[0053] In the following description, only the movement limit position Lp on the Y2 side will be described.

[0054] (Ball lamp section) Here, as shown in FIG. 8, the first moving member 13 and the second moving member 14 of the first embodiment form a ball ramp section 17 in which the inclined surfaces 133 and 143 are in point contact with each other via the ball 135 in an inclination direction that is a direction intersecting with the Y direction. Specifically, the first moving member 13 and the second moving member 14 form the ball ramp section 17 having the inclined surfaces 133 and 143 that face each other in the Y direction (axial direction) to accommodate the ball 135. In the ball ramp section 17, three pairs of the inclined surfaces 133 and 143 that face each other in the Y direction are provided (see FIG. 3), but one, two, or four or more pairs of the inclined surfaces 133 and 143 may be provided. A detailed structure of the ball ramp section 17 will be described below.

[0055] The inclined surfaces 133 and 143 of the ball ramp portion 17 are formed on the opposing surfaces 136 (see FIG. 9) and 145 (see FIG. 9) of the first moving member 13 and the second moving member 14, respectively, in order to release the rotation-stopped state of the screw 11 caused by the brake portion 2 by utilizing the force transmitted from the brake portion 2 to the second moving member 14 that it abuts against during braking. The opposing surface 136 of the first moving member 13 and the opposing surface 145 of the second moving member 14 are surfaces that face each other in the Y direction.

[0056] Moreover, each of the inclined surface 133 and the inclined surface 143 does not have a screw structure. That is, the first moving member 13 and the second moving member 14 are not engaged with each other through thread grooves of a predetermined pitch in the Y direction. Furthermore, the length Le (see FIG. 9) in the inclination direction of the inclined surface 133 of the first moving member 13 and the inclined surface 143 of the second moving member 14 is long enough so that the ball 135 does not come off when the first biasing member 3 is compressed. That is, the length Le is longer than the compression stroke (maximum expansion / contraction amount) when the first biasing member 3 is compressed. The inclination angle θ is generally about 45°, but can be easily changed depending on the balance of the force required for release.

[0057] The inclined surfaces 133 of the first moving member 13 and the inclined surfaces 143 of the second moving member 14 are each disposed at equal angular intervals around the screw 11 along the R direction (see FIG. 3).

[0058] (Released the rotation stop state using the ball ramp) As shown in FIG. 8, the movement amount limiting device 100 is configured to release the rotation stop state caused by the brake section 2 by rotating the inclined surface 133 of the first moving member 13 relative to the inclined surface 143 of the second moving member 14 in the R1 direction (or R2 direction) using the biasing force P from the first biasing member 3 and the motor torque Mt.

[0059] Specifically, the torque obtained by adding the motor torque Mt and the converted torque Ct obtained by converting the biasing force P of the first biasing member 3 in the Y1 direction into a torque in the R direction by the inclined surfaces 133 and 143 is greater than the brake torque Bt generated by the biasing force P of the first biasing member 3 in the brake unit 2. Here, while FIG. 8 shows the motor torque Mt in the R1 direction, the converted torque Ct in the R1 direction, and the brake torque Bt in the R2 direction as examples, the motor torque Mt in the R2 direction, the converted torque Ct in the R2 direction, and the brake torque Bt in the R1 direction are also assumed. In the following description, the motor torque Mt in the R1 direction, the converted torque Ct in the R1 direction, and the brake torque Bt in the R2 direction will be described as examples.

[0060] The motor torque Mt is a torque transmitted from the motor 200 to the screw 11 when moving the first moving member 13 in the Y1 direction (the other axial direction).

[0061] The brake torque Bt is a torque generated by a friction force in the R1 direction generated by the screw shaft side braking member 21 and the guide portion side braking member 22 sandwiched between the first biasing member 3 and the second moving member 14 in a state where the screw shaft side braking member 21 and the guide portion side braking member 22 are biased by the biasing force P of the first biasing member 3. That is, it is calculated by Bt = μB × P × rB. Here, μB is the static friction coefficient of the screw shaft side braking member 21 and the guide portion side braking member 22. rB is the effective radius where the screw shaft side braking member 21 and the guide portion side braking member 22 contact each other.

[0062] Next, the conversion torque Ct will be described with reference to FIG. 9 and FIG.

[0063] The converted torque Ct is a torque in the R2 direction, which is the same direction as the motor torque Mt, and is generated by the assist tangential force of the motor torque Mt. First, the biasing force P of the first biasing member 3 is transmitted to the ball 135 via the brake unit 2 and the second moving member 14, and is also transmitted to the contact point between the ball 135 and the inclined surface 133 of the first moving member 13. At the contact point, the tangential force Fr, which is the X-direction component, is calculated by the biasing force P / tan θ. Then, the converted torque Ct in the R2 direction is calculated by multiplying the tangential force Fr by the radius Rramp in the D direction from the rotation center axis C of the screw 11 (Fr×Rramp).

[0064] 8, when a motor torque Mt in the R2 direction is applied to the screw 11, the motor torque Mt and the converted torque Ct are applied to the first moving member 13. As a result, the sum of the motor torque Mt and the converted torque Ct is greater than the brake torque Bt, so the first moving member 13 rotates in the R2 direction against the brake torque Bt and then moves in the Y1 direction. Therefore, the braking of the screw 11 by the brake unit 2 is released.

[0065] That is, when the first moving member 13 is released from a rotation-stopped state, it rotates integrally with the screw 11 by the engagement portion 15. When the second moving member 14 is released from a rotation-stopped state, its rotation in the R direction is restricted by the guide portion 12. As a result, the first moving member 13 rotates integrally with the screw 11 in the R1 direction by the torque obtained by adding the motor torque Mt and the conversion torque Ct. At this time, the screw shaft side braking member 21 and the guide side braking member 22 each return to their original positions by a spring (not shown).

[0066] (Effects of the first embodiment) In the first embodiment, the following effects can be obtained.

[0067] In the first embodiment, as described above, the opposing surfaces 136 and 145 of the first moving member 13 and the second moving member 14 facing each other in the Y direction (axial direction) are formed with the inclined surfaces 133 and 143 extending in an inclined direction intersecting the Y direction (axial direction) instead of a screw structure in order to release the rotation stop state of the screw 11 by the brake unit 2 using the force transmitted from the brake unit 2 to the second moving member 14 that abuts against them during braking. As a result, the inclined surfaces 133 and 143 are formed on the opposing surfaces 136 and 145 of the first moving member 13 and the second moving member 14, which are relatively easy to secure an area and are easy to process. In addition, the inclined surfaces 133 and 143 are not structured to form a large number of relatively small inclined surfaces like a screw structure. As a result, in the movement amount limiting device 100, a structure (inclined surfaces 133 and 143) for releasing the braking of the screw 11 by the brake unit 2 can be easily formed.

[0068] In the first embodiment, as described above, first moving member 13 and second moving member 14 have ball ramp portion 17 in which inclined surface 133 and inclined surface 143 are in point contact with each other via sphere 135 in a direction perpendicular to the inclination direction. This allows a structure for releasing the rotation-stopped state of screw 11 to be realized by ball ramp portion 17, so that a structure for releasing the rotation-stopped state of screw 11 can be realized relatively easily.

[0069] Furthermore, in the first embodiment, as described above, first moving member 13 and second moving member 14 have ball ramp portion 17 having one or more pairs of inclined surfaces 133 and inclined surfaces 143 facing each other in the Y direction to accommodate ball 135. This makes it possible to suppress an increase in the number of inclined surfaces 133 and inclined surfaces 143 compared to a screw structure having a large number of screw grooves, and therefore makes it possible to suppress an increase in the complexity of the structure of ball ramp portion 17.

[0070] In the first embodiment, as described above, the first moving member 13 and the second moving member 14 have the ball ramp portion 17 having the inclined surface 133 and the inclined surface 143 facing each other in a direction perpendicular to the inclination direction in order to accommodate the ball 135. As a result, since it is only necessary to provide the inclined surface 133 and the inclined surface 143, the angles of the inclined surface 133 and the inclined surface 143 can be set larger on the facing surfaces 136 and 145 of the first moving member 13 and the second moving member 14, respectively, compared to a screw structure having a screw groove. As a result, the converted torque Ct converted from the biasing force P of the first biasing member 3 facing in the Y1 direction to a torque in the R direction can be increased, and the braking of the screw 11 by the brake portion 2 can be reliably released.

[0071] Furthermore, in the first embodiment, as described above, inclined surfaces 133 and 143 are disposed at equal angular intervals around screw shaft 11 along the R direction (circumferential direction) of rotation center axis C. This makes it possible to arrange ball 135 so as to balance the moment generated in ball 135 accommodated in inclined surfaces 133 and 143 of ball ramp portion 17 as screw 11 rotates, thereby enabling ball ramp portion 17 to rotate smoothly as screw 11 rotates.

[0072] In the first embodiment, as described above, the movement amount limiting device 100 includes the first biasing member 3 that elastically deforms when the first moving member 13 moves to the movement limiting position Lp and the second moving member 14 abuts against the brake section 2. The biasing force P from the first biasing member 3 and the motor torque Mt transmitted from the motor 200 to the screw 11 when moving the first moving member 13 toward the other side of the Y direction (axial direction) rotate the inclined surfaces 133 and 143 of the first moving member 13 relative to the inclined surfaces 133 and 143 of the second moving member 14 in the R direction (circumferential direction) around the rotation center axis C, thereby releasing the rotation stop state by the brake section 2. Here, when the first biasing member 3 is compressed by a strong force obtained by combining the motor torque Mt of the motor 200 and the impact force with the second moving member 14, the biasing force P of the first biasing member 3 becomes stronger, and the brake torque Bt in the R direction (circumferential direction) of the brake unit 2 based on the biasing force P of the first biasing member 3 becomes larger. In such a case, the brake torque Bt may become larger than the motor torque Mt, but by utilizing the biasing force P from the first biasing member 3, the torque resisting the brake torque Bt can be increased by the amount of the biasing force P utilized. As a result, the rotation stop state of the screw 11 by the brake unit 2 can be released more reliably.

[0073] Furthermore, in the first embodiment, as described above, the torque obtained by adding the motor torque Mt and the converted torque Ct obtained by converting the biasing force P of the first biasing member 3 toward the other side in the Y direction (axial direction) into a torque in the R direction (circumferential direction) by the inclined surfaces 133 and 143 is greater than the brake torque Bt generated by the biasing force P of the first biasing member 3 in the brake unit 2. As a result, when moving the first moving member 13 from the movement limiting position Lp toward the other side in the Y direction (axial direction), the torque obtained by adding the motor torque Mt and the converted torque Ct can be applied to the brake unit 2, so that the rotation stop state of the screw 11 by the brake unit 2 can be released more reliably.

[0074] In the first embodiment, as described above, the linear movement mechanism 1 includes the engagement portion 15 that engages with the first moving member 13 at the movement limiting position Lp. When the first moving member 13 is released from the rotation stop state, the engagement portion 15 rotates the first moving member 13 integrally with the screw 11, and when the second moving member 14 is released from the rotation stop state, the guide portion 12 restricts the rotation in the R direction (circumferential direction). As a result, when the first moving member 13 is released from the rotation stop state, the first moving member 13 and the screw 11 can be rotated integrally with respect to the second moving member 14, so that the torque (converted torque Ct) of the first moving member 13 rotated by the biasing force P of the first biasing member 3 can be applied to the screw 11. As a result, by further applying the motor torque Mt from the motor 200 to the screw 11, the motor torque Mt and the converted torque Ct can be applied to the screw 11, so that a sufficient torque can be applied to the screw 11 to release the rotation stop state caused by the brake portion 2 and rotate the screw 11.

[0075] Also, in the first embodiment, as described above, the amount of rotation of the first shaft 300 connected to the motor 200 of the aircraft Ar is limited. This makes it possible to easily form a structure (the inclined surface 133 and the inclined surface 143) for releasing the braking of the screw 11 by the brake unit 2 in the movement limiting device 100 used in the aircraft Ar.

[0076] [Second embodiment] The configuration of a movement amount limiting device 800 according to the second embodiment will be described with reference to Figures 11 and 12. The second embodiment differs from the first embodiment in that the first moving member 813 and the second moving member 814 of the movement amount limiting device 800 constitute a jaw clutch portion 817. Note that in the second embodiment, detailed description of the same configuration as in the first embodiment will be omitted.

[0077] In FIG. 11, a movement amount limiting device 800 of the second embodiment is provided in an aircraft system 2000 as a device for limiting the movement of a control surface 500 of an aircraft Ar.

[0078] Here, the direction of travel of the aircraft Ar is the X direction, the forward direction of the X direction is the X1 direction, and the backward direction of the X direction is the X2 direction. The left-right direction of the aircraft Ar is the Y direction, the right direction of the Y direction is the Y1 direction, and the left direction of the Y direction is the Y2 direction. The up-down direction of the aircraft Ar is the Z direction, the upward direction of the Z direction is the Z1 direction, and the downward direction of the Z direction is the Z2 direction.

[0079] The aircraft system 2000 includes a movement limiting device 800, a motor 200, a pair of first shafts 300, a pair of second shafts 400, a plurality of control surfaces 500, a plurality of actuators 600, and a control device 700. The first shaft 300 is an example of the "shaft" in the claims.

[0080] (Travel limiting device) The movement limiting device 800 is configured to limit the amount of rotation of the first shaft 300 connected to the motor 200 of the aircraft Ar. In other words, the movement limiting device 100 is a device that prevents the first shaft 300 from being overrun by the motor 200.

[0081] 12, the movement amount limiting device 800 includes a linear movement mechanism 801, a brake unit 2, and a first biasing member 3. The first biasing member 3 is an example of the "biasing member" in the claims.

[0082] (Linear movement mechanism) The linear movement mechanism 801 includes a screw 11 (see FIG. 2), a guide portion 12 (see FIG. 2), a first moving member 813, a second moving member 814, an engagement portion 15 (see FIG. 2), and a second biasing member 16 (see FIG. 2). The screw 11 is an example of the "screw shaft" in the claims.

[0083] Here, the circumferential direction around the rotation axis C of the screw 11 is defined as the R direction, one of the R directions is defined as the R1 direction, and the other of the R directions is defined as the R2 direction. The radial direction perpendicular to the extension direction of the rotation axis C is defined as the D direction, the outer side of the D direction is defined as the D1 direction, and the inner side of the D direction is defined as the D2 direction.

[0084] (Jaw clutch part) 12, the first moving member 813 and the second moving member 814 of the second embodiment form a jaw clutch portion 817 in which the inclined surfaces 813a and the inclined surfaces 814a are in surface contact with each other in an inclination direction that is a direction intersecting the Y direction. That is, the first moving member 813 and the second moving member 814 form the jaw clutch portion 817 having a pair of opposing inclined surfaces 813a and 814a.

[0085] The other configurations of the second embodiment are similar to those of the first embodiment, so the description will be omitted.

[0086] (Effects of the second embodiment) In the second embodiment, the following effects can be obtained.

[0087] In the second embodiment, similarly to the first embodiment, in the opposing surfaces 136 and 145 of the first moving member 813 and the second moving member 814 facing each other in the Y direction (axial direction), in order to release the rotation stop state of the screw 11 by the brake unit 2 by utilizing the force transmitted from the brake unit 2 to the second moving member 814 that comes into contact during braking, inclined surfaces 813a and 814a extending in an inclined direction intersecting the Y direction (axial direction) are formed instead of a screw structure. This makes it possible to easily form a structure (inclined surfaces 813a and 814a) for releasing the braking of the screw 11 by the brake unit 2 in the movement amount limiting device 800.

[0088] In the second embodiment, as described above, the first moving member 813 and the second moving member 814 have the jaw clutch portion 817 in which the inclined surface 813a and the inclined surface 814a come into surface contact with each other in a direction perpendicular to the inclination direction. This allows the jaw clutch portion 817 to provide a structure for releasing the rotation-stopped state of the screw 11, so that the structure for releasing the rotation-stopped state of the screw 11 can be provided relatively easily.

[0089] In the second embodiment, as described above, the first moving member 813 and the second moving member 814 have a jaw clutch portion 817 having a pair of inclined surfaces 813a and 814a that face each other in a direction perpendicular to the inclination direction. This makes it possible to suppress an increase in the number of inclined surfaces 813a and 814a compared to a screw structure having a large number of thread grooves, and therefore to suppress the complication of the structure of the jaw clutch portion 817. Note that other effects of the second embodiment are similar to those of the first embodiment, and therefore description thereof will be omitted.

[0090] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the description of the embodiments above, and further includes all modifications (variations) within the meaning and scope of the claims.

[0091] For example, in the above first and second embodiments, the movement amount limiting device 100 (800) is configured to limit the amount of rotation of the first shaft 300 connected to the motor 200 of the aircraft Ar, but the present invention is not limited to this. In the present invention, the movement amount limiting device may be applied to an aircraft flap or door, an elevator door, a machine tool, an electric winch and a hoist, etc.

[0092] In the above first and second embodiments, the linear movement mechanism 1 (801) has the second biasing member 16, but the present invention is not limited to this. In the present invention, the linear movement mechanism does not have to have the second biasing member.

[0093] [Aspects] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0094] (Item 1) a linear movement mechanism 1 (801) including a screw 11 rotated by a driving force from a motor 200, a guide portion 12 extending along an axial direction (Y) of a rotation center axis C of the screw 11, a first moving member 13 (813) having a screw groove 132 engaging with the screw 11 and moving linearly in the axial direction (Y) as the screw 11 rotates, and a second moving member 14 (814) engaging with the guide portion 12 and moving linearly in the axial direction (Y) together with the first moving member 13 (813) as the screw 11 rotates; a brake unit 2 that generates a braking force to stop the rotation of the screw 11 by the second moving member 14 (814) that abuts against the first moving member 13 (813) based on the first moving member 13 (813) moving to one of the movement limit positions Lp in the axial direction (Y), The movement amount limiting device 100 (800) has an opposing surface 136 (145) of each of the first moving member 13 (813) and the second moving member 14 (814) facing the axial direction (Y) formed with an inclined surface 133 (143, 813a, 814a) extending in an inclined direction intersecting the axial direction (Y) rather than a screw structure, in order to release the rotation stop state of the screw 11 caused by the brake unit 2 by utilizing the force transmitted from the brake unit 2 to the second moving member 14 (814) that comes into contact with it during braking.

[0095] (Item 2) The movement amount limiting device 100 (800) described in item 1, wherein the first moving member 13 (813) and the second moving member 14 (814) have a ball ramp portion 17 in which the inclined surfaces 133 (143, 813a, 814a) are in point contact with each other via a sphere 135 in a direction perpendicular to the inclination direction, or a jaw clutch portion 817 in which the inclined surfaces 133 (143, 813a, 814a) are in surface contact with each other.

[0096] (Item 3) The movement amount limiting device 100 (800) described in item 3, wherein the first moving member 13 (813) and the second moving member 14 (814) have the ball ramp portion 17 having one or more sets of opposing inclined surfaces 133 (143, 813a, 814a) in a direction perpendicular to the inclination direction to accommodate the ball 135, or the jaw clutch portion 817 having one or more sets of opposing inclined surfaces 133 (143, 813a, 814a) in a direction perpendicular to the inclination direction.

[0097] (Item 4) The movement limiting device 100 according to item 3, wherein the inclined surfaces 133 (143, 813a, 814a) are arranged around the screw shaft 11 at equal angular intervals along the circumferential direction R of the rotation center axis C.

[0098] (Item 5) The brake device further includes a biasing member 3 that is elastically deformed when the first moving member 13 (813) moves to the movement limiting position Lp and the second moving member 14 (814) abuts against the brake unit 2, The movement amount limiting device 100 (800) described in item 1 is configured to release the rotation stop state caused by the brake section 2 by rotating the inclined surface 133 (143, 813a, 814a) of the first moving member 13 (813) relatively in the circumferential direction around the rotation center axis C with respect to the inclined surface 133 (143, 813a, 814a) of the second moving member 14 (814) by the biasing force P from the biasing member 3 and the motor torque Mt transmitted from the motor 200 to the screw 11 when moving the first moving member 13 (813) toward the other side of the axial direction (Y).

[0099] (Item 6) The movement amount limiting device 100 (800) described in item 5, wherein the torque obtained by adding together the motor torque Mt and the converted torque Ct obtained by converting the biasing force P of the biasing member 3 toward the other side of the axial direction (Y) into a torque in the circumferential direction by the inclined surface 133 (143, 813a, 814a) is greater than the brake torque Bt generated by the biasing force P of the biasing member 3 in the brake section 2.

[0100] (Item 7) The linear movement mechanism 1 (801) further includes an engagement portion 15 that engages with the first moving member 13 (813) at the movement limiting position Lp, The movement amount limiting device 100 (800) described in item 5, wherein when the first moving member 13 (813) is released from the rotation stopped state, it rotates integrally with the screw 11 by the engagement portion, and when the second moving member 14 (814) is released from the rotation stopped state, its rotation in the circumferential direction is limited by the guide portion 12.

[0101] (Item 8) The movement limiting device 100 (800) according to item 1, which limits the amount of rotation of a shaft 300 connected to a motor 200 of an aircraft Ar. [Explanation of symbols]

[0102] 1, 801 Linear movement mechanism 2 Brake section 3 First biasing member (biasing member) 11 Ball screw (screw shaft) 12 Guide section 13, 813 First moving member 14, 814 Second moving member 15 Engagement part 17 Ball Lamp Section 100, 800 Travel limiter 132 Thread groove 133, 813a Slope 135 balls 136 Opposite Surface 143, 814a Slope 145 Opposite Surface 200 Motor 300 1st shaft (shaft) 817 Jaw clutch part Ar aircraft Bt Brake torque C Rotational axis Ct conversion torque Lp travel limit position Mt Motor Torque P biasing force

Claims

1. A linear movement mechanism including: a screw shaft that rotates by a driving force from a motor; a guide portion that extends along the axial direction of the rotation center axis of the screw shaft; a first moving member that has a thread groove that engages with the screw shaft and moves linearly in the axial direction as the screw shaft rotates; and a second moving member that engages with the guide portion and moves linearly in the axial direction together with the first moving member as the screw shaft rotates; a brake unit that generates a braking force to stop rotation of the screw shaft by the second moving member that abuts against the first moving member based on the first moving member moving to one of the movement limiting positions in the axial direction, A movement amount limiting device in which, on opposing surfaces of the first moving member and the second moving member facing each other in the axial direction, an inclined surface is formed that extends in an inclined direction that intersects the axial direction rather than a screw structure, in order to release the rotation stop state of the screw shaft caused by the brake section by utilizing the force transmitted from the brake section to the second moving member that abuts against it during braking.

2. 2. The movement amount limiting device according to claim 1, wherein the first moving member and the second moving member have a ball ramp portion in which the inclined surfaces are in point contact with each other via a sphere in a direction perpendicular to the inclination direction, or a jaw clutch portion in which the inclined surfaces are in surface contact with each other.

3. 3. The movement amount limiting device according to claim 2, wherein the first moving member and the second moving member have the ball ramp portion having one or more pairs of inclined surfaces opposed to each other in the axial direction to accommodate the ball, or the jaw clutch portion having one or more pairs of inclined surfaces opposed to each other in a direction perpendicular to the inclination direction.

4. 2. The movement limiting device according to claim 1, wherein the inclined surfaces are disposed at equal angular intervals around the screw shaft in a circumferential direction of the central axis of rotation.

5. a biasing member that is elastically deformed when the first moving member moves to the movement limiting position and the second moving member abuts against the brake portion, 2. The movement amount limiting device according to claim 1, wherein the rotation stop state caused by the brake section is released by rotating the inclined surface of the first moving member relative to the inclined surface of the second moving member in a circumferential direction about the rotation center axis by the biasing force from the biasing member and the motor torque transmitted from the motor to the screw shaft when moving the first moving member toward the other side of the axial direction.

6. 6. The movement amount limiting device according to claim 5, wherein a sum of the motor torque and a converted torque obtained by converting the biasing force of the biasing member toward the other side of the axial direction into a torque in the circumferential direction by the inclined surface is greater than a brake torque generated by the biasing force of the biasing member in the brake portion.

7. the linear movement mechanism further includes an engagement portion that engages with the first moving member at the movement limiting position, The movement amount limiting device according to claim 5, wherein when the first moving member is released from the rotation stopped state, it rotates integrally with the screw shaft by the engagement portion, and when the second moving member is released from the rotation stopped state, its rotation in the circumferential direction is limited by the guide portion.

8. 10. The movement limiting device of claim 1, which limits the amount of rotation of a shaft connected to the motor of an aircraft.

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