JP2016094752A - Resistance generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably release resistance against rotational motion of a rotating body with a simple configuration when rotational motion of a releasing member is transmitted to the rotating body.SOLUTION: A resistance generating device 1 used in a vehicle 150 includes: a releasing member 7 which can be rotated with power applied; a fixing member 4 arranged around the releasing member; an elastic member 3 in which engagement parts 3b1 and 3b2 engaged with the releasing member, contact parts 3a1 and 3a2 capable of being brought into contact with the fixing member, and elastic deformation parts 3c1 and 3c2 disposed between the engagement parts and the contact parts are integrally formed; and an output member 2 holding the elastic member and transmitting the rotational motion of the elastic member to a rotating body 113.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a resistance generator that generates resistance to rotational motion of a rotating body used in a vehicle.

  2. Description of the Related Art Conventionally, a vehicle is provided with a drive device that opens and closes an opening / closing member such as a back door, a swing door, a slide door, or a window glass. For example, a drive device that opens and closes a back door (rear door) has a joint connected to the vehicle body at one end and a joint connected to the opening and closing member at the other end. The driving device includes a threaded spindle that is rotated by the power of the motor or the human power (power) of the user, a spindle nut that is screwed to the threaded spindle, one end fixed to the spindle nut, and the other end connected to the opening / closing member. And a spindle tube fixed to the joint.

  When the threaded spindle is rotated by power, the rotational movement of the threaded spindle is converted into the linear movement of the spindle nut by the threaded spindle and the spindle nut. As a result, the spindle tube fixed to the spindle nut moves linearly to open and close the open / close member. The driving device is configured such that the user can manually open and close the opening / closing member by placing a hand on the opening / closing member. The drive device has a compression coil spring in order to hold the open / close member in an open state. The compression coil spring maintains the open state of the opening / closing member by generating a reaction force balanced with the weight of the opening / closing member.

  In addition, the drive device is provided with a resistance generator that generates resistance to the rotational movement of the threaded spindle in order to maintain the open state of the open / close member even when an external force such as wind or snow acts on the open / close member. (Patent Document 1). Patent Document 1 discloses a resistance generator in a driving device having a threaded spindle and a spindle nut. The resistance generator includes a rotatable power receiver that receives power from a motor, an output member that transmits the rotational motion of the power receiver to a threaded spindle, a hollow cylindrical transmission element that surrounds the power receiver, A fixing member that surrounds the cylindrical transmission element; a first torsion coil spring that frictionally engages the inner peripheral surface of the fixing member; and a second torsion coil spring that frictionally engages the inner peripheral surface of the hollow cylindrical transmission element. Yes. The rotational movement of the power receiver is transmitted to the output member.

  When the power receiving portion is rotated by the motor, the power receiving portion winds up (biases) the second torsion coil spring to reduce the outer diameter of the second torsion coil spring, thereby reducing the second torsion coil spring and the hollow cylindrical transmission element. Reduce frictional engagement. As a result, the power receiving portion can rotate the output member with a small resistance to open and close the open / close member. When the rotation of the motor is stopped, the opening / closing member is opened at an opening degree by friction engagement between the fixing member and the first torsion coil spring and friction engagement between the hollow cylindrical transmission element and the second torsion coil spring. The open state is maintained.

  On the other hand, when the user manually applies a force to the opening / closing member, the output member reduces (biases) the second torsion coil spring, strengthening the frictional engagement between the second torsion coil spring and the hollow cylindrical transmission element, The cylindrical transmission element is rotated. The rotation of the hollow cylindrical transmission element winds up (biases) the first torsion coil spring to reduce the outer diameter of the first torsion coil spring and weakens the frictional engagement between the first torsion coil spring and the fixing member. As a result, the output member rotates with a small resistance, and the user can manually open and close the opening / closing member.

German Utility Model Application Publication No. 202007015597 Specification

  However, in Patent Document 1, when the output member is rotated by the motor to open and close the opening / closing member, the frictional engagement between the second torsion coil spring and the hollow cylindrical transmission element cannot be completely released. The resistance to the rotational movement of the output member due to is not zero.

  Moreover, since frictional resistance is generated by expansion and contraction of the diameters of the first and second torsion coil springs, there is a problem that the resistance force is not stable. When the frictional resistance is adjusted by expanding and contracting the diameters of the first and second torsion coil springs, it is difficult to set the frictional resistance. Since it is difficult to set the frictional resistance force by the first and second torsion coil springs, there is a problem that the opening / closing member may be unintentionally closed only by a slight external force acting on the opening / closing member. Furthermore, even when the output member is rotated by the motor, the second torsion coil spring is frictionally engaged with the hollow cylindrical transmission element, so that the driving force of the motor is lost.

  Therefore, the present invention provides a resistance generator that can reliably release the resistance to the rotational motion of the rotating body with a simple structure when the rotational motion of the release member is transmitted to the rotating body.

In order to solve the above problem, a resistance generator used in a vehicle according to an embodiment of the present invention is:
A release member that can be rotated by receiving power;
A fixing member disposed around the release member;
An elastic member integrally formed with an engagement portion that engages with the release member, a contact portion that can contact the fixing member, and an elastic deformation portion disposed between the engagement portion and the contact portion;
An output member that holds the elastic member and transmits the rotational motion of the elastic member to a rotating body;
Is provided.

  According to the present invention, when the rotational movement of the release member is transmitted to the rotating body, the resistance to the rotational movement of the rotating body can be reliably released with a simple structure.

The figure which shows the drive device provided in the back door of the vehicle. The perspective view of a drive device. Sectional drawing of a drive device. Sectional drawing of the resistance generator arrange | positioned between a motor and a reduction gear. The exploded perspective view of a resistance generator. Sectional drawing taken along the VI-VI line of FIG. The perspective view of a leaf | plate spring. The perspective view of the leaf | plate spring of a modification. Sectional drawing taken along the IX-IX line of FIG. The perspective view of an output member. The perspective view of the output member in which the leaf | plate spring was integrated.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in the following embodiments are not intended to limit the scope of the present invention only to those unless otherwise specified. Absent.

(Driver)
FIG. 1 is a diagram illustrating a driving device 100 provided in a back door (opening / closing member) 200 of a vehicle 150. In this embodiment, the drive device 100 is a so-called spindle power back door drive unit. However, the drive device 100 may be used to open and close an opening / closing member such as a swing door, a slide door, and a window glass of the vehicle. Further, the driving device 100 is not limited to opening and closing of a door, and may be used to raise and lower a vehicle seat.

  The driving device 100 is provided between the vehicle body 150A and the back door 200 on both sides in the width direction of the vehicle body 150A of the vehicle 150. Joints 102 and 104 are provided at both ends of the driving device 100, respectively. The joint 102 at one end of the driving device 100 is connected to the vehicle body 150A. The joint 104 at the other end of the drive device 100 is connected to the back door 200. When the cylindrical cover tube 106 moves relative to the cylindrical housing tube 107 by the motor 110 (FIG. 3) built in the driving device 100, the back door 200 is opened and closed.

  FIG. 2 is a perspective view of the driving device 100. The driving device 100 includes a housing tube 107 and a cover tube 106 that is nested in the housing tube 107. The cover tube 106 can reciprocate in the axial direction with respect to the housing tube 107. The cover tube 106 and the housing tube 107 constitute a telescopic tube. A joint 102 is provided at the end of the housing tube 107. A joint 104 is provided at the end of the cover tube 106. The electric cable 108 supplies power to the motor 110 (FIG. 3) housed in the housing tube 107.

  FIG. 3 is a cross-sectional view of the driving device 100. FIG. 3A is a diagram illustrating the driving device 100 when the back door 200 is fully closed. FIG. 3B is a diagram illustrating the driving device 100 when the back door 200 is fully opened. A motor 110 as a drive source of the drive device 100 is housed in a housing tube 107. A rotating shaft 111 of the motor 110 is connected to the resistance generator 1. The resistance generator 1 is connected to a reduction gear (planetary gear) 112 and transmits the power of the motor 110 to the reduction gear 112. The speed reducer 112 is connected to a threaded spindle (rotary body) 113. The resistance generator 1 is disposed between the motor 1 and the speed reducer 112. The speed reducer 112 reduces the rotational speed of the resistance generator 1 and transmits it to the threaded spindle 113. The resistance generator 1 transmits the rotational motion of the motor 110 to the threaded spindle 113 via the speed reducer 112.

  The spindle nut 114 is screwed onto the threaded spindle 113. The threaded spindle 113 is rotatably held by a housing tube 107. The threaded spindle 113 is inserted into a cylindrical spindle tube 115. One end of the spindle tube 115 is fixed to the spindle nut 114, and the other end is fixed to the joint 104 and the cover tube 106.

  A compression coil spring 116 is accommodated in the cover tube 106. When the back door 200 is opened, the compression coil spring 116 generates a biasing force that balances the weight of the back door 200 in order to hold the back door 200 in an open state. Here, “balance with the weight of the back door 200” means that the back door 200 can be held at the arbitrary position when the back door 200 is opened at the arbitrary position.

  When the motor 110 rotates, the threaded spindle 113 rotates via the resistance generator 1 and the speed reducer 112. The rotational motion of the threaded spindle 113 is converted into linear motion of the spindle nut 114 and the spindle tube 115 by screwing of the threaded spindle 113 and the spindle nut 114. Due to the linear motion of the spindle nut 114 and the spindle tube 115, the cover tube 106 moves relative to the housing tube 107 to open and close the back door 200.

  When the back door 200 is fully closed, as shown in FIG. 3A, the spindle nut 114 is located at the lower part of the threaded spindle 113, and most of the cover tube 106 covers the housing tube 107. Yes. That is, the telescopic tube is in a contracted state. When the motor 110 rotates to open the back door 200, the spindle nut 114 moves upward by the rotation of the threaded spindle 113. When the back door 200 is fully opened, as shown in FIG. 3B, the spindle nut 114 is positioned on the upper part of the threaded spindle 113, and the cover tube 106 moves upward with respect to the housing tube 107. That is, the telescopic tube is in an extended state.

  The cover tube 106 can be stopped at an arbitrary position with respect to the housing tube 107. The cover tube 106 stopped at an arbitrary position receives the weight of the back door 200, and the weight of the back door 200 balances with the urging force of the compression coil spring 116. Thereby, the back door 200 can be stopped at an arbitrary position. The driving device 100 is a door holding device that realizes a free stop that allows the back door 200 to be freely stopped at any opening degree. When an undesired external force such as wind acts on the back door 200 or when the vehicle is stopped on an inclined surface and the balance between the weight of the back door 200 and the biasing force of the compression coil spring 116 is lost, the resistance generator 1 generates resistance to the opening / closing operation of the back door 200 to hold the position of the back door 200.

(Resistance generator)
In order to prevent the back door 200 from being closed by its own weight when the back door 200 is opened, the drive device 100 is provided with a compression coil spring 116. However, when the back door 200 is open and a load such as wind or snow acts on the back door 200, or the vehicle is stopped on an inclined surface, the weight of the back door 200 is balanced with the biasing force of the compression coil spring 116. If the door breaks down, the back door 200 may be closed undesirably. Therefore, the resistance generator 1 is provided in the drive device 100 so that the back door 200 does not close even if a certain amount of external force acts on the opened back door 200. The resistance generator 1 mechanically switches between a stop holding state (holding force application state) and an operation permissible state (holding force release state) according to the operating state of the back door 200 without requiring electrical control. It is a resistance mechanism that can be switched. The resistance generator 1 generates a resistance (holding force) when the back door 200 is stopped at an arbitrary opening and holds the back door 200 at an arbitrary opening, and the motor 110 opens and closes the back door 200. And the function of releasing the resistance and allowing the motor 110 to open and close the back door 200 without any output loss.

  FIG. 4 is a cross-sectional view of the resistance generator 1 disposed between the motor 110 and the speed reducer 112. The resistance generator 1 is housed in the housing tube 107. The input side of the resistance generator 1 is connected to the motor 110. The output side of the resistance generator 1 is connected to the speed reducer 112. The resistance generator 1 receives power from the rotating shaft 111 of the motor 110 and rotates. Since the motor 110 rotates at a high speed, the output member 2 of the resistance generator 1 rotates at a high speed. The reducer 112 reduces the rotation speed of the output member 2 and rotates the threaded spindle 113 at the reduced rotation speed.

  FIG. 5 is an exploded perspective view of the resistance generator 1. The resistance generator 1 includes an output member 2, a leaf spring (elastic member) 3, a case (fixing member) 4, a support plate 5, an outer cylinder (holding member) 6, a release member (power receiving portion) 7, a bearing 8 and a bearing. A holding member 9 is provided. The release member 7 can rotate by receiving power from the motor 110. The release member 7 is locked to the rotating shaft 111 of the motor 110 by press fitting, and rotates integrally with the rotating shaft 111. The release member 7 may be locked to the rotating shaft 111 of the motor 110 by a locking member such as a screw, a pin, or a serration. Further, the release member 7 may be formed integrally with the rotation shaft 111. As shown in FIG. 4, the annular portion 6 c extending radially inward from one end portion of the outer cylinder 6 is disposed between the motor 110 and the support plate 5. The support plate 5 and the outer cylinder 6 are fixed to the motor 110 by two screws 10.

  The support plate 5 is provided with two grooves 5a. One end of the case 4 is provided with two protrusions 4a (only one is shown in FIG. 5) extending in the axial direction. By inserting the protrusion 4a of the case 4 into the groove 5a of the support plate 5, the case 4 is fixed to the support plate 5 so as not to rotate. The leaf spring 3 is incorporated in the output member 2 and is held by the output member 2. A bearing 8 is attached to the bearing portion 2k of the output member 2. The bearing 8 is held by a bearing holding member 9. The output member 2 incorporating the leaf spring 3 is inserted into the case 4. The bearing holding member 9 is provided with two grooves 9a. The other end of the case 4 is provided with two protrusions 4b extending in the axial direction. The two grooves 9 a of the bearing holding member 9 are fitted into the two protrusions 4 b of the case 4, so that the bearing holding member 9 holds the case 4 so that the case 4 does not rotate. The case 4 functions as a cylindrical fixing member disposed around the release member 7, the leaf spring 3, and the output member 2.

  A plurality of protrusions 9 b are provided on the outer peripheral portion of the bearing holding member 9. A plurality of grooves 6 a are provided at the other end of the outer cylinder 6. The plurality of protrusions 9 b of the bearing holding member 9 are fitted into the plurality of grooves 6 a of the outer cylinder 6, and the outer cylinder 6 holds the bearing holding member 9 so that the bearing holding member 9 does not rotate. The output member 2 is provided with a gear 11. The reduction gear 112 is attached to the outer cylinder 6 so that the gear 12 (FIG. 4) of the reduction gear 112 meshes with the gear 11 of the output member 2. A plurality of protrusions 112 a and 112 b are provided on the outer periphery of the speed reducer 112. A plurality of locking holes 6 b are provided at the other end of the outer cylinder 6. The plurality of protrusions 112a of the speed reducer 112 and the plurality of locking holes 6b of the outer cylinder 6 constitute a snap fit fit. The plurality of protrusions 112 a of the speed reducer 112 are locked by the plurality of locking holes 6 b of the outer cylinder 6, and the plurality of protrusions 112 b are fitted into the plurality of grooves 6 a, whereby the speed reducer 112 is fixed to the outer cylinder 6. Is done.

  The output member 2 is held by the bearing 8 so as to be rotatable around the rotation axis X. The leaf spring 3 engages with the release member 7 and can rotate about the rotation axis X together with the release member 7. Therefore, when the rotating shaft 111 of the motor 110 rotates, the output member 2 rotates via the release member 7 and the leaf spring 3. The gear 11 of the output member 2 meshes with the gear 12 of the speed reducer 112 and transmits the rotational motion of the output member 2 to the speed reducer 112.

  6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 6A is a cross-sectional view showing the shape of the leaf spring 3 when the motor 110 is stopped. FIG. 6B is a cross-sectional view showing the shape of the leaf spring 3 when the motor 110 is rotating. The leaf spring 3 has a substantially convex shape as a whole when viewed from the direction along the rotation axis 111 of the motor 110. However, the leaf spring 3 is not limited to a substantially convex shape, and may be a cross shape, an elliptical shape, or the like.

  FIG. 7 is a perspective view of the leaf spring 3. FIG. 7A is a perspective view of the leaf spring 3 with the extending portions 3d1, 3d2 provided with the engaging portions 3b1, 3b2 facing upward. FIG. 7B is a perspective view of the leaf spring 3 with the attachment portion 3c facing upward. The leaf spring 3 includes two contact portions (contact surfaces) 3a1, 3a2 that can contact the inner peripheral surface of the case 4, and two engagement portions (end portions) 3b1, 3b2 that can be engaged with the release member 7. Have One end portions of the two contact portions 3a1 and 3a2 are connected by an attachment portion 3c. At both ends of the attachment portion 3c, there are provided substantially L-shaped elastic deformation portions 3c1 and 3c2 when viewed along the rotation axis X. The leaf spring 3 has elasticity as a whole, and elastic deformation portions 3c1 and 3c2 are provided as the most elastically deforming portions. The elastic deformation portions 3c1 and 3c2 bias the contact portions 3a1 and 3a2 in a contact state where the contact portions 3a1 and 3a2 are in contact with the inner peripheral surface of the case 4 with a predetermined contact pressure. The other end portions of the two contact portions 3a1, 3a2 are connected to the engagement portions 3b1, 3b2 via extension portions 3d1, 3d2 extending beyond the rotation axis X from the contact portions 3a1, 3a2. . As for the leaf | plate spring 3, contact part 3a1, 3a2, engagement part 3b1, 3b2, and attachment part 3c which has elastic deformation part 3c1, 3c2 are integrally formed.

  The engaging portions 3b1 and 3b2 are alternately arranged in the direction of the rotation axis X. In this embodiment, the engaging portions 3b1, 3b2 do not face each other, but the engaging portions 3b1, 3b2 have engaging surfaces extending in the direction of the rotation axis X so as to face each other. It may be. The extending portions 3d1, 3d2 overlap each other when viewed along the rotation axis X. However, the extending portions 3d1 and 3d2 may be arranged so as not to overlap each other by shifting in the radial direction. According to the present embodiment, one engaging portion 3b1, 3b2 is provided for each of the contact portions 3a1, 3a2. However, the present invention is not limited to this. One contact portion may be provided with a plurality of engaging portions.

  In the present embodiment, the leaf spring 3 is provided with two contact portions 3a1, 3a2 that can contact the inner peripheral surface of the case 4, but the number of contact portions is limited to two. is not. The leaf spring 3 may have one contact portion or may have three or more contact portions.

  A modification of the leaf spring 3 will be described with reference to FIG. FIG. 8 is a perspective view of a leaf spring 13 according to a modification. In the leaf spring 13 shown in FIG. 8, the same structure as that of the leaf spring 3 shown in FIG. FIG. 8A is a perspective view of the leaf spring 13 with the extending portions 3d1, 3d2 provided with the engaging portions 3b1, 3b2 facing upward. FIG. 8B is a perspective view of the leaf spring 13 with the attachment portion 3c facing upward. The leaf spring 13 of the modification shown in FIG. 8 is different from the leaf spring 3 shown in FIG. 7 in that holes 13e1 and 13e2 are provided in the elastic deformation portions 3c1 and 3c2. The spring constant of the leaf spring 3 can be set to a predetermined value by changing the size, number, shape, position, etc. of the holes 13e1, 13e2. The predetermined value of the spring constant of the leaf spring 3 is set so that the resistance generating device 1 generates a predetermined resistance force when the contact portions 3 a 1 and 3 a 2 of the leaf spring 3 come into contact with the inner peripheral surface of the case 4. .

  When the width of the leaf springs 3 and 13 in the direction of the rotation axis X is increased, the contact area with the case 4 increases, so that the surface pressure at the contact surface between the leaf springs 3 and 13 and the case 4 decreases, and the resistance of the contact surface is reduced. Abrasion can be improved. On the other hand, by reducing the width of the leaf springs 3 and 13 in the direction of the rotation axis X, the overall length of the resistance generator 1 can be reduced. In this case, in order to obtain a predetermined resistance, the spring constants of the leaf springs 3 and 13 are set to a predetermined value by changing the shape of the elastic deformation portions 3c1 and 3c2. When the widths of the leaf springs 3 and 13 are reduced, the widths of the extending portions 3d1 and 3d2 that support the engaging portions 3b1 and 3b2 are also reduced. If the widths of the extending portions 3d1 and 3d2 become too small, the rigidity of the engaging portions 3b1 and 3b2 is lowered. Therefore, the leaf springs 3 and 13 may not be able to be released by the rotational force of the releasing member 7. Therefore, the width of the leaf springs 3 and 13 may be set so that the rigidity of the engaging portions 3b1 and 3b2 does not become too small.

  When the width of the leaf springs 3 and 13 is increased, the width of the elastically deforming portions 3c1 and 3c2 of the leaf springs 3 and 13 is also increased, so that the spring constant of the leaf springs 3 and 13 may be too large. If the spring constants of the leaf springs 3 and 13 become too large, the release member 7 may not be able to release the contact between the contact portions 3a1 and 3a2 and the inner peripheral surface of the case 4. In that case, as shown in the modification of FIG. 8, it is effective to adjust the spring constants of the leaf springs 3 and 13 by providing the holes 13e1 and 13e2 in the elastic deformation portions 3c1 and 3c2. Thus, the contact area between the contact portions 3a1, 3a2 and the inner peripheral surface of the case 4, the spring constants of the elastic deformation portions 3c1, 3c2 of the leaf springs 3, 13, the extension portions 3d1, 3d2 and the engagement portions 3b1, 3b2 The width of the leaf springs 3 and 13 in the direction of the rotation axis X may be set in consideration of

  The leaf springs 3 and 13 are made of a thin metal plate such as iron or SUS. However, the leaf springs 3 and 13 may be made of a resin material. The case 4 is made of a cylindrical body made of a resin material. However, the case 4 may be made of a metal such as iron or SUS. When the leaf springs 3 and 13 are made of a thin metal plate such as iron or SUS, the case 4 is preferably made of a resin material. Conversely, when the leaf springs 3 and 13 are made of a resin material, the case 4 may be made of a metal such as iron or SUS.

  As shown in FIG. 6, the leaf spring 3 (or the leaf spring 13) is incorporated in the output member 2. The output member 2 is provided with a plurality of mounting projections 2a, 2b, 2c and 2d and two stoppers 2e and 2f extending in the direction of the rotation axis X from the end opposite to the end where the gear 11 is provided. It has been. The attachment portion 3 c of the leaf spring 3 is disposed to face the attachment protrusion 2 a of the output member 2. The elastic deformation portion 3c1 is disposed between the attachment protrusions 2a and 2b so as to face the attachment protrusion 2b. The elastic deformation portion 3c2 is disposed between the attachment protrusions 2a and 2c so as to face the attachment protrusion 2c. The extending portions 3d1, 3d2 are arranged to face the mounting protrusion 2d. The attachment protrusions 2a, 2b, 2c and 2d maintain the posture of the leaf spring 3 incorporated in the output member 2. 9 is a cross-sectional view taken along line IX-IX in FIG. FIG. 10 is a perspective view of the output member 2. FIG. 11 is a perspective view of the output member 2 in which the leaf spring 3 is incorporated. The output member 2 has claws 2m and 2n for preventing the leaf spring 3 from being detached in order to prevent the leaf spring 3 from coming off in the direction of the rotation axis X. The claw 2m extends from the tip end of the mounting projection 2b onto the elastic deformation portion 3c1 of the leaf spring 3 in a direction perpendicular to the rotation axis X. The claw 2n extends from the tip end of the mounting projection 2c onto the elastic deformation portion 3c2 of the leaf spring 3 in a direction perpendicular to the rotation axis X. The claws 2 m and 2 n prevent the leaf spring 3 from being detached from the output member 2 by locking the elastic deformation portions 3 c 1 and 3 c 2 of the leaf spring 3.

  The release member 7 fixed to the rotating shaft 111 of the motor 110 is disposed between the engaging portions 3b1 and 3b2 of the leaf spring 3. The engaging portions 3b1 and 3b2 of the leaf spring 3 sandwich the release member 7 between the engaging portions 3b1 and 3b2 by a tensile force. The release member 7 has a rectangular cross section. The release member 7 is not limited to a rectangular cross section, and may have a narrow portion (short diameter portion L1) and a wide portion (long diameter portion L2). Accordingly, the release member 7 may be square or oval. The release member 7 has a function as a cam that acts on the engaging portions 3 b 1 and 3 b 2 of the leaf spring 3. The engaging portions 3b1 and 3b2 are urged in a direction approaching each other by the elastic force of the elastic deformation portions 3c1 and 3c2. Accordingly, in a state where the motor 110 shown in FIG. 6A is stopped, the engaging portions 3b1 and 3b2 are released so that the distance between the engaging portions 3b1 and 3b2 becomes the short diameter portion L1 of the releasing member 7. The member 7 is in pressure contact. A stopper 2e is disposed on the side of the engaging portion 3b1 opposite to the release member 7. A stopper 2f is disposed on the side of the engaging portion 3b2 opposite to the release member 7. That is, the engaging portions 3b1 and 3b2 are disposed between the stoppers 2e and 2f.

  The output member 2 is provided with openings 2g and 2h on the circumference. In the state where the motor 110 shown in FIG. 6 (a) is stopped, the contact portion 3a1 protrudes radially outward from the opening 2h to contact the inner peripheral surface of the case 4, and the contact portion 3a2 extends from the opening 2g. It protrudes radially outward and contacts the inner peripheral surface of the case 4.

(Operation of resistance generator)
When the motor 110 is stopped and the back door 200 is stopped at an arbitrary position, the resistance generator 1 is in the state shown in FIG. Also, when the user puts his hand on the back door 200 and manually opens and closes the back door 200, the resistance generating device 1 is in the state shown in FIG. At this time, the contact portions 3 a 1 and 3 a 2 are in contact with the inner peripheral surface of the case 4 with a predetermined contact pressure by the spring force of the leaf spring 3. When the leaf spring 3 is to be rotated, a frictional resistance force is generated by the pressure contact between the contact portions 3 a 1 and 3 a 2 of the leaf spring 3 and the inner peripheral surface of the case 4. The resistance generator 1 is in a stopped holding state (holding force application state).

  When an external load such as wind or snow is applied to the open back door 200 and the back door 200 tries to open and close, the threaded spindle 113 tries to rotate. The rotational movement of the threaded spindle 113 attempts to rotate the output member 2 via the speed reducer 112. When the output member 2 tries to rotate, the mounting protrusions 2 a, 2 b, 2 c, 2 d or the stoppers 2 e, 2 f of the output member 2 come into contact with the leaf spring 3. Since the contact portions 3 a 1 and 3 a 2 of the leaf spring 3 are in pressure contact with the inner peripheral surface of the case 4, a frictional resistance is generated against the rotational movement of the threaded spindle 113. Therefore, the resistance generator 1 can hold the open state of the back door 200 at an arbitrary position. On the other hand, the resistance of the resistance generator 1 is set so that the user can open and close the back door 200 by touching the back door 200 even when the resistance generator 1 is generating resistance. The magnitude of the resistance of the resistance generator 1 can be easily set by changing the spring constant of the leaf spring 3 or the initial shape before elastic deformation.

  The leaf spring 3 can generate resistance against the rotational movement of the threaded spindle 113 by the resistance generator 1 in both cases of forward rotation and reverse rotation of the threaded spindle 113 by opening and closing the back door 200. The resistance generator 1 can always generate a substantially stable frictional resistance force both when stopped and when manually rotated.

  When the motor 110 rotates, the release member (holding resistance release member) 7 rotates together with the motor shaft 111. As shown in FIG. 6B, the release member 7 rotates relative to the engaging portions 3b1, 3b2 against the urging force of the elastically deforming portions 3c1, 3c2 of the leaf spring 3. A rotational phase shift occurs between the engagement portions 3b1 and 3b2 and the release member 7, and the long diameter portion L2 of the release member 7 widens the interval between the engagement portions 3b1 and 3b2. Even if the motor 110 rotates forward to open the back door 200 or the motor 110 rotates backward to close the back door 200, the release member 7 spreads the engaging portions 3 b 1 and 3 b 2 of the leaf spring 3.

  When the clearance between the engagement portions 3b1 and 3b2 of the leaf spring 3 is widened by the release member 7 and the engagement portions 3b1 and 3b2 are moved radially outward, the elastic deformation portions 3c1 and 3c2 are deformed. Then, the contact portions 3a1, 3a2 are moved inward in the radial direction. The outer diameter of the leaf spring 3 is reduced, whereby the contact portions 3a1 and 3a2 are in a released state in which the contact between the contact portions 3a1 and 3a2 and the inner peripheral surface of the case 4 is released. Therefore, resistance to the rotational movement of the leaf spring 3 and the output member 2 is eliminated. The resistance generator is allowed to operate by the motor 110 (holding force released state). Since the leaf spring 3 and the case 4 are not in contact with each other, the output loss of the motor 110 is eliminated.

  Since the release member 7 is rotated at a high speed by the motor 110, if the distance between the engagement portions 3b1 and 3b2 is too large, the release member 7 slides against the engagement portions 3b1 and 3b2 and the leaf spring 3 However, only the release member 7 may rotate. Therefore, stoppers 2e and 2f are provided so that the interval between the engaging portions 3b1 and 3b2 does not become larger than a predetermined interval. The stoppers 2e and 2f regulate the deformation amount of the leaf spring 3 so that the leaf spring 3 does not deform too much. This prevents the motor shaft 111 from spinning around the leaf spring 3.

  The difference between the short diameter portion L1 and the long diameter portion L2 of the release member 7 is preferably large. If the difference between the short diameter portion L1 and the long diameter portion L2 is small, the release member 7 may slip and escape with respect to the engagement portions 3b1 and 3b2. By increasing the difference between the short diameter portion L1 and the long diameter portion L2, the release member 7 is prevented from slipping and idling with respect to the engagement portions 3b1 and 3b2. Further, the positional accuracy of the stoppers 2e and 2f can be made rough by increasing the difference between the short diameter portion L1 and the long diameter portion L2. Increasing the long diameter portion L2 of the release member 7 is preferable because the rotational force can be transmitted from the motor shaft 111 to the leaf spring 3 with a large torque. Therefore, the cross-sectional shape of the release member 7 is preferably a rectangle rather than a square.

  When the release member 7 is rotated by the motor 110, the release member 7 widens the distance between the engagement portions 3b1 and 3b2, and the engagement portion 3b1 is brought into contact with the stopper 2e and the engagement portion 3b2 is brought into contact with the stopper 2f. Let The rotation of the release member 7 rotates the output member 2 via the engaging portions 3b1, 3b2 and the stoppers 2e, 2f. At this time, the contact portions 3a1, 3a2 are in a released state in which the contact between the contact portions 3a1, 3a2 and the inner peripheral surface of the case 4 is released, so that the output member 2 can rotate without holding resistance. The stoppers 2e and 2f function as a rotation transmission member that transmits the rotation of the leaf spring 3 to the output member 2.

  Since the rotation of the output member 2 is transmitted from the gear 11 of the output member 2 to the gear 12 of the speed reducer 112, the speed reducer 112 rotates the threaded spindle 113. Thereby, the back door 200 is opened and closed by the motor 110.

  In the present embodiment, the case 4 is fixed to the motor 110 via the support plate 5. The case 4 may be fixed to the housing tube 107 of the drive device 100. In the present embodiment, the elastic deformation portions 3c1 and 3c2 are substantially L-shaped, but the shape of the elastic deformation portions 3c1 and 3c2 is not limited thereto. The elastic deformation portions 3c1 and 3c2 may be arcuate or linear. The elastically deformable portions 3c1, 3c2 and the attaching portion 3c may be formed in a straight line.

  In this embodiment, the stoppers 2e and 2f are provided on the output member 2. However, the stopper may be provided in the leaf spring 3 itself. When the leaf spring 3 is provided with a stopper, the stopper prevents the leaf spring 3 and the release member 7 from slipping, and the rotation of the leaf spring 3 is performed via the mounting protrusions 2a, 2b, 2c, and 2d of the output member 2. It is transmitted to the output member 2.

  In this embodiment, since the release member 7 is rotated integrally with the motor shaft 111 of the motor 110, the resistance generator 1 can be reduced in size. However, the release member 7 may be rotated by a motor or a motor other than the motor via a power transmission member such as a gear or a pulley.

  According to the present embodiment, when the back door 200 is opened, the resistance generator 1 generates a holding resistance that holds the open position of the back door 200 and can prevent the back door 200 from falling. Since the resistance generator 1 does not generate resistance when the back door 200 is opened and closed by the motor 110, the screw lead of the threaded spindle 113 can be set longer and the opening and closing speed of the back door 200 can be increased. . Further, since the resistance generator 1 generates resistance when the back door 200 is manually opened and closed, the holding force of the back door 200 can be maintained even if the screw lead of the threaded spindle 113 is set long. .

  According to the present embodiment, the holding resistance force can be completely released when the back door 200 is opened and closed by the motor 110, so there is no loss of the motor 110, and the motor 110 does not need to be enlarged. Moreover, since the leaf | plate spring 3 and the case 4 leave | separate at the time of the drive by the motor 110, the performance degradation by a friction and the failure | damage of components can be reduced.

  According to the present embodiment, when the rotational motion of the release member is transmitted to the rotating body, the resistance to the rotational motion of the rotating body can be reliably released with a simple structure.

DESCRIPTION OF SYMBOLS 1 ... Resistance generator 2 ... Output member 3 ... Leaf spring (elastic member)
3a1, 3a2 ... contact portions 3b1, 3b2 ... engagement portions 3c1, 3c2 ... elastic deformation portion 4 ... case (fixing member)
7 ... Release member 113 ... Threaded spindle (rotating body)
150 ... Vehicle

Claims (7)

A resistance generator used in a vehicle,
A release member that can be rotated by receiving power;
A fixing member disposed around the release member;
An elastic member integrally formed with an engagement portion that engages with the release member, a contact portion that can contact the fixing member, and an elastic deformation portion disposed between the engagement portion and the contact portion;
An output member that holds the elastic member and transmits the rotational motion of the elastic member to a rotating body;
A resistance generator.   The resistance generator according to claim 1, wherein when the release member is rotated by the power, the elastic member is rotated by the release member.   When the release member is rotated by the power, the engagement member is moved by the release member and the elastic deformation portion is deformed to release the contact between the contact portion and the fixing member. The resistance generator according to 1.   The resistance of the rotary body to a rotational motion is generated by the contact portion in contact with the fixing member when the elastic member is rotated by the rotary body via the output member. The resistance generator as described in any one of Claims.   The elastic member acts as a pair of the engaging portions that sandwich the release member therebetween by a pulling force, a pair of the contact portions, and the engaging portions, and the contact portion as the fixing member. The resistance generator according to any one of claims 1 to 4, wherein the pair of elastically deforming portions that act on the urging force to be contacted are integrally formed leaf springs.   The resistance generation device according to claim 1, wherein the release member is formed integrally with a rotation shaft of a motor.   The resistance generator according to claim 6, wherein the resistance generator is arranged between a reduction gear connected to the rotating body and the motor.

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