JP2006169897A - Opening/closing device for opening/closing body for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To positively prevent backlash between members when an opening/closing body is in a totally closed position. <P>SOLUTION: An actuator 4 comprising an electric motor 20, an arm 12 turned receiving the driving force of the electric motor 20, and a rod 13 turnably connected to the arm 12 to transmit the driving force to a rear door 3, comprises a stopper 12a provided between the arm 12 and the rod 13 to lock the arm 12 and the rod 13 by frictional force when the rear door 3 is in the totally closed position. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an opening / closing device for a vehicle opening / closing body.

  As a known opening / closing device for an opening / closing body, there is one described in Patent Document 1 described later. In this opening / closing device, the drive unit (opening / closing device) is provided at the rear portion of the vehicle body. The opening formed in the vehicle body is opened and closed by a back door (opening / closing body). The back door is connected to the vehicle body via a hinge arm. The hinge arm is connected to the rack. The rack is provided with a tooth portion and a guide surface, and the tooth portion of the rack is engaged with the output gear. The guide surface of the rack can be slidably contacted with the guide member. On the guide surface of the rack, an inclined portion is provided on the vehicle rear side.

  When there is a back door in the fully closed position, the inclined portion of the guide surface of the rack comes into contact with the guide member, so that the tooth portion of the rack is pressed toward the output gear. As a result, the gap between the rack tooth portion and the output gear is reduced, and rattling due to vibration or the like during traveling of the vehicle is prevented between these members.

When the drive unit operates in the fully closed position of the back door, the driving force of the motor is transmitted to the output gear via the intermediate gear, and the rack that engages with the output gear is moved to the rear side of the vehicle. Along with this, the back door connected to the rack via the hinge arm pivots upward in the vehicle, and finally reaches the fully open position.
Japanese Patent Laying-Open No. 2003-285643 (see FIGS. 1, 2 and 4)

  By the way, in the drive unit described above, when the back door is in the fully closed position, the tooth portion of the rack is pressed toward the output gear, thereby preventing rattling due to vibrations or the like during vehicle travel between these members. Has been.

  However, since it is necessary to provide a backlash between the rack teeth and the output gear, even if these members are pressed against each other between the rack teeth and the output gear, A gap is always formed. Therefore, the tooth portion of the rack can move relative to the output gear by this gap, and rattling between these members could not be completely prevented.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to more reliably prevent rattling between members when the opening / closing body is in the fully closed position.

  In order to solve the above-described problem, the technical means taken in the present invention includes a drive source, a first member that rotates in response to the drive force of the drive source, and An opening / closing device for a vehicle opening / closing body, comprising: a second member rotatably connected to the first member to transmit a driving force of a driving source to the opening / closing body; and the first member and the second member The first friction member is provided between the first member and the second member by a frictional force provided between the first member and the second member when the opening / closing body is in the fully closed position.

  Preferably, as described in claim 2, the second friction is provided between the first member and the second member, and always applies a friction force between the first member and the second member. It is good to have a member.

  Preferably, the first friction member and the second friction member may be made of an elastic body.

  According to the first aspect of the present invention, the first member and the second member are locked by the frictional force when the opening / closing body is in the fully closed position by the first friction member. According to this structure, no gap is formed between the first member and the second member. As a result, rattling due to vibration or the like during vehicle travel can be more reliably prevented between the first member and the second member.

  According to the second aspect of the present invention, the frictional force always acts between the first member and the second member by the second friction member. According to this structure, when the first member rotates with respect to the second member, a sliding resistance always acts between these members. Thereby, backlash can always be prevented between the first member and the second member.

  According to invention of Claim 3, a 1st friction member and a 2nd friction member consist of elastic bodies. In this case, the magnitude of the frictional force relating to these members is adjusted by changing the elastic modulus of the elastic body. Thereby, the magnitude | size of a desired frictional force can be set easily.

  The best mode for carrying out the present invention will be described below with reference to FIGS.

  FIG. 4 is a schematic diagram showing the configuration of the electric back door 1 of the present embodiment. As shown in the figure, this electric back door 1 includes a back door 3 (open / close body) hinged to the upper rear portion of the vehicle body 2, an actuator 4 for opening and closing the back door 3 electrically, and a damper stay. And 5.

  An actuator 4 (an opening / closing device for a vehicle opening / closing body) is fixed to the rear pillar 2a of the vehicle body 2 and outputs a driving force via an arm 12 (first member); And a rod 13 (second member) for connecting the base end portion of the back door 3. The rod 13 is rotatably connected to the distal end portion of the arm 12 and the proximal end portion of the back door 3.

  When the back door 3 is in the fully closed position, as shown by a solid line in the figure, the arm 12 is disposed so that the tip side faces downward (downward in FIG. 4) of the vehicle. Folded (closed state). When the back door 3 is in the fully open position, as shown by a two-dot chain line in the figure, the arm 12 is arranged so that the front end side faces the rear of the vehicle (right side in FIG. 4). Is extended (open state). Therefore, the back door 3 is opened (closed) by moving the arm 12 and the rod 13 between these two states by the operation of the drive unit 11.

  The damper stay 5 has a configuration of a gas piston filled with high-pressure gas, and one end and the other end thereof are connected to the rear portion of the vehicle body 2 and the base end portion of the back door 3, respectively. The damper stay 5 generates a resultant force in the closing direction together with its own weight in the first half of the opening of the back door 3 to prevent a sudden door opening. On the other hand, in the latter half of the opening of the back door 3, a resultant force in the opening direction is generated together with its own weight to assist the opening of the door. In other words, the damper stay 5 applies a closing or opening force to the back door 3 before and after the position where the generated force and the weight of the back door 3 are balanced.

  Next, the drive unit 11 will be described with reference to FIGS. 1 to 3 and FIG.

  The drive unit 11 includes an electric motor 20, a clutch mechanism 21, a pinion gear 24, an intermediate gear 25, an output shaft 26, a sector gear 27, and an arm 12. The upper case 23 and the lower case 22 rotatably support the output shaft 26, and the output shaft 26 is fitted to the sector gear 27. A sector gear 27, an intermediate gear 25 that engages with the sector gear 27, and a pinion gear 24 that engages with the intermediate gear 25 are accommodated between the opposing surfaces of the upper case 23 and the lower case 22.

  The electric motor 20 (drive source) generates a driving force for opening (closing) the back door 3 described above. The driving force generated by the electric motor 20 is transmitted to the clutch mechanism 21 via a worm (not shown) and a worm wheel 20a.

  As shown in FIG. 2, the clutch mechanism 21 is a known electromagnetic clutch including a plate 21a, a rotor 21b, an electromagnetic coil 21c, and the like. When the electromagnetic coil 21c is supplied with power, an attractive force is generated between the plate 21a and the rotor 21b, and the plate 21a and the rotor 21b are frictionally engaged (engaged state). In this state, when the worm wheel 20a is rotated by the driving force of the electric motor 20, the plate 21a connected to the worm wheel 20a rotates together with the worm wheel 20a. At this time, the rotor 21b rotates together with the plate 21a by the frictional force acting between the plate 21a and the rotor 21b. Further, the rotor 21b is connected to the output shaft 31 so as to rotate integrally. That is, when the drive unit 11 operates, the clutch mechanism 21 is engaged, and the driving force of the electric motor 20 is transmitted to the output shaft 31 via the clutch mechanism 21.

  The pinion gear 24 is connected to the output shaft 31 inserted through the insertion hole 22 a of the lower case 22 and rotates integrally with the output shaft 31. More specifically, the pinion gear 24 is formed with a through hole 24a penetrating in the axial direction, and a serration 24b corresponding to the serration 31a of the output shaft 31 is formed on the inner peripheral surface thereof. Therefore, the pinion gear 24 rotates integrally with the output shaft 31 when the serration 24b is engaged with the serration 31a of the output shaft 31.

  The intermediate gear 25 is rotatably supported by the lower case 22 by being inserted through the shaft portion 22 b of the lower case 22. The intermediate gear 25 includes a first gear portion 25a having a larger diameter than the pinion gear 24 and a second gear portion 25b having a smaller diameter than the first gear portion 25a. In the intermediate gear 25, the first gear portion 25 a is meshed with the pinion gear 24, whereby the intermediate gear 25 is rotationally driven by the electric motor 20.

  The output shaft 26 is formed in a substantially stepped cylindrical body, and the base shaft side (lower side in FIG. 1) of the first shaft portion 26 a is inserted into the bearing hole 22 c of the lower case 22. It is supported rotatably. The output shaft 26 has a diameter reduced stepwise from the first shaft portion 26a toward the tip side, and includes a first serration shaft portion 26b, a second shaft portion 26c, a second serration shaft portion 26d, and a screw portion 26e. Is forming. The sector gear 27 is fitted to the first serration shaft portion 26b, and the arm 12 is fitted to the second serration shaft portion 26d.

  The sector gear 27 has a shape of a bowl having only a part of the circumference, and is fitted to the output shaft 26 to rotate integrally with the output shaft 26. More specifically, the sector gear 27 is formed with a through hole 27a penetrating in the axial direction, and a serration 27b is formed on the inner peripheral surface thereof corresponding to the serration of the first serration shaft portion 26b. Therefore, the sector gear 27 rotates integrally with the output shaft 26 when the serration 27b is engaged with the serration of the first serration shaft portion 26b. The sector gear 27 is meshed with the second gear portion 25 b of the intermediate gear 25, whereby the sector gear 27 is rotationally driven by the intermediate gear 25 together with the output shaft 26.

  As shown in FIG. 2, the arm 12 is connected to the second serration shaft portion 26d of the output shaft 26 that is inserted into the bearing hole 23b of the upper case 23 and extends to one side (right side in FIG. 2). It rotates integrally with the shaft 26. More specifically, a sleeve 12a protruding in the axial direction corresponding to the output shaft 26 (second serration shaft portion 26d) is fixed to the base end portion of the arm 12, and the inner peripheral surface thereof is fixed with the sleeve 12a. A serration 12b is formed corresponding to the serration of the second serration shaft portion 26d. Therefore, the arm 12 rotates integrally with the output shaft 26 by fitting the serration 12b to the serration of the output shaft 26 (second serration shaft portion 26d). A nut 32 is fastened to a thread portion 26e of the output shaft 26 that is fitted to the arm 12 and extends to one side (right side in FIG. 2). That is, the arm 12 receives the driving force of the electric motor 20 and rotates between an open state indicated by a solid line in FIG. 3 and a closed state indicated by a two-dot chain line in FIG.

  A distal end portion of the arm 12 is rotatably connected to the rod 13 via the ball joint structure 7. As shown in FIG. 5, the ball joint structure 7 includes a ball 71 fixed to the arm 12 side, a receiving portion 13a formed at the end of the rod 13, and a friction ring 72 (second friction member). . The friction ring 72 is made of an elastic body (for example, resin or rubber), and is sandwiched between the arm 12 and the rod 13 in a state where predetermined elastic deformation has occurred. As a result, a frictional force always acts between the arm 12 and the rod 13.

  A stopper 12 a (first friction member) is provided between the arm 12 and the rod 13. The stopper 12 a is made of an elastic body (for example, resin or rubber) and is fixed to the arm 12. The stopper 12a is pressed against the rod 13 when the back door 3 is in the fully closed position. Thereby, when the back door 3 exists in a fully closed position between the arm 12 and the rod 13, it has a structure where a frictional force acts via the stopper 12a.

  Hereinafter, the action of the stopper 12a when the back door 3 is opened from the fully closed position to the fully opened position will be described with reference to FIGS. 2, 4, 6A, and 6B.

  When the back door 3 is in the fully closed position indicated by the solid line in FIG. 4, the arm 12 and the rod 13 are folded. In this case, as shown in FIG. 6A, when the stopper 12a fixed to the arm 12 is pressed against the rod 13, a frictional force acts between the arm 12 and the rod 13 via the stopper 12a. is doing. That is, the arm 12 and the rod 13 are locked by the frictional force by the stopper 12a. Therefore, even under a situation in which the vehicle vibrates due to traveling or the like, no gap is formed between the arm 12 and the rod 13, and these members do not rattle each other.

  In the fully closed position of the back door 3, when the electric motor 20 is supplied with power and the drive unit 11 operates, the driving force of the electric motor 20 is transmitted to the output shaft 31 via the clutch mechanism 21, and the output shaft 31 rotates. Driven. The driving force is transmitted to the arm 12 through the pinion gear 24, the intermediate gear 25 (first gear portion 25a and second gear portion 25b), the sector gear 27, and the output shaft 26, and then back through the rod 13. It is transmitted to the door 3. As a result, the back door 3 is opened to the fully open position indicated by a two-dot chain line in FIG.

  While the back door 3 is opened from the fully closed position to the fully opened position, the arm 12 and the rod 13 are gradually extended. As shown in FIG. 6B, the stopper 12a fixed to the arm 12 is provided. It reaches a state away from the rod 13. At this time, the frictional force does not act between the arm 12 and the rod 13. While the back door 3 is opened from the fully closed position to the fully opened position, a frictional force is constantly applied between the arm 12 and the rod 13 by the friction ring 72 (see FIG. 5). Thereby, when the arm 12 rotates with respect to the rod 13, sliding resistance always acts between these members. Therefore, the arm 12 and the rod 13 do not rattle while the folded arm 12 and rod 13 are gradually extended. In particular, when the back door 3 is in the fully closed position, rattling is more reliably prevented between the arm 12 and the rod 13 by both the stopper 12a and the friction ring 72.

  As described above, according to the actuator 4 of the present invention, the arm 12 and the rod 13 are locked by the frictional force when the back door 3 is in the fully closed position by the stopper 12a fixed to the arm 12. . According to this structure, no gap is formed between the arm 12 and the rod 13. As a result, rattling due to vibrations or the like during traveling of the vehicle can be more reliably prevented between the arm 12 and the rod 13.

  Further, according to the present invention, the frictional force always acts between the arm 12 and the rod 13 by the friction ring 72 of the ball joint structure 7. According to this structure, when the arm 12 rotates with respect to the rod 13, sliding resistance always acts between these members. Thereby, rattling between the arm 12 and the rod 13 can be prevented at all times.

  According to the present invention, the stopper 12a and the friction ring 72 are made of an elastic body. In this case, the magnitude of the frictional force relating to these members is adjusted by changing the elastic modulus of the elastic body. Thereby, the magnitude | size of a desired frictional force can be set easily.

The disassembled perspective view which shows the structure of a drive unit. The fragmentary sectional view of a drive unit. The front view of a drive unit. The figure which shows schematically the example by which the actuator of this invention was applied to the electrically driven back door of a vehicle. AA sectional drawing in FIG. 3 which shows a ball joint structure. The figure which shows the effect | action of a stopper typically.

Explanation of symbols

3 Back door
4 Actuator (Opening / closing device for vehicle opening / closing body)
12 Arm (first member)
12a Stopper (first friction member)
13 Rod (second member)
20 Electric motor (drive source)
72 Friction ring (second friction member)

Claims (3)

A driving source; a first member that rotates in response to the driving force of the driving source; and a second member that is rotatably connected to the first member to transmit the driving force of the driving source to the opening / closing body. An opening / closing device for a vehicle opening / closing body comprising: the friction member that is provided between the first member and the second member, and that friction between the first member and the second member when the opening / closing body is in a fully closed position. An opening / closing device for a vehicle opening / closing body, comprising a first friction member that is locked by force. The first friction member is provided between the first member and the second member, and includes a second friction member that constantly applies a friction force between the first member and the second member. The opening / closing apparatus of the vehicle opening / closing body of description. The opening / closing device for a vehicle opening / closing body according to claim 2, wherein the first friction member and the second friction member are made of an elastic body.

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