Patent Application
20190085613
The present invention relates to a driving device for a vehicular opening-closing body.
Patent Document 1 discloses a driving device for a vehicular opening-closing body that has a resin supporting structure of a drum housing and a motor unit. The drum housing houses a drive drum for driving a vehicular opening-closing body (a window glass). The drum housing includes a boss portion disposed to protrude. The motor unit includes a fitted portion fitted to the boss portion of the drum housing. The fitted portion of the motor unit has a cylindrical portion that abuts on a peripheral edge portion at a base of the boss portion of the drum housing and covers an outer surface of the boss portion, and an inward flange that forms an insertion hole to cover a distal end surface of the boss portion. A tapping screw is used for coupling the drum housing to the motor unit. This tapping screw has a screw portion movably inserted through an insertion hole of the inward flange to be screwed into the boss portion, and a head that sandwiches the inward flange with the distal end surface of the boss portion. A protrusion is disposed to protrude on the distal end surface of the boss portion, and the protrusion is flatly crushed between the inward flange and the distal end surface of the boss portion when the tapping screw is screwed.
However, the driving device for the vehicular opening-closing body disclosed in Patent Document 1 requires extremely high accuracies: on positioning of the boss portion of the drum housing with the fitted portion of the motor unit, and on positioning of a fitting body of the drum housing with the motor unit and the tapping screw, thus possibly making their assemblability of the respective members poor. Screwing the tapping screw in the state where the assembling properties of the respective members are poor possibly causes damages on the drum housing and the motor unit due to a compressive force generated by this screwing, and this possibly causes man-hour loss or a failure in fastening.
The present invention has been made based on the above-described awareness on the problem, and it is an object of the present invention to provide a driving device for a vehicular opening-closing body configured to stably assemble a drum housing and a motor unit without requiring high positioning accuracy.
A driving device for a vehicular opening-closing body of the present invention includes a drum housing and a motor unit. The drum housing houses a drive drum. The drive drum drives the vehicular opening-closing body. The motor unit includes an output shaft. The output shaft integrally rotates with the drive drum. One of the drum housing and the motor unit includes a plurality of boss portions projecting toward another one of the drum housing and the motor unit. Securing members for securing the drum housing and the motor unit are secured to the plurality of boss portions. The other one of the drum housing and the motor unit includes a plurality of boss receiving portions that receive the plurality of boss portions. At least one of the plurality of boss receiving portions has a reverse tapered surface that has a diameter expanded toward a corresponding boss portion. In a state where the drum housing and the motor unit are supported, a clearance is disposed between the boss portion and the reverse tapered surface.
The plurality of boss portions and the plurality of boss receiving portions may be disposed so as to surround the output shaft of the motor unit.
The plurality of boss portions may be disposed on the motor unit, the plurality of boss receiving portions may be disposed on the drum housing, and the output shaft of the motor unit may project to the drum housing side with respect to the plurality of boss portions of the motor unit.
The securing member and a distal end portion of the boss portion may be made of metallic material, and at least one of abutting portions of both sides may be squashed.
Abutting portions may be disposed on facing surfaces of a drum housing portion of the drum housing and the motor unit in a direction where the plurality of boss portions and the plurality of boss receiving portions face one another.
According to the present invention, a driving device for a vehicular opening-closing body configured to stably assemble a drum housing and a motor unit without requiring high positioning accuracy can be provided.
With reference to
The window regulator 10 includes a guide rail 20 as an elongated member. This guide rail 20 is mounted to an inside of a door panel (not illustrated) of a vehicle via brackets 22 and 24 disposed on different positions in a longitudinal direction. The guide rail 20 is arranged having the longitudinal direction in an almost height direction of the vehicle in a state of being mounted to the door panel of the vehicle.
The window regulator 10 includes a slider base (a glass carrier) 30 that is supported to the guide rail 20 so as to be freely movable up and down, and a window glass is supported to the slider base 30. Respective one ends of a pair of drive wires 32 and 34 are coupled to this slider base 30. The pair of drive wires 32 and 34 are made of conductive materials such as stainless steel, tungsten, titanium, and phosphor bronze.
A pulley bracket 40 is secured adjacent to an upper end in the longitudinal direction of the guide rail 20, and a guide pulley 42 is rotatably supported to this pulley bracket 40 via a pulley support shaft 44. The drive wire 32 extends from the slider base 30 in an upward direction of the guide rail 20 along the guide rail 20, and is supported by a wire guide groove formed on an outer peripheral surface of the guide pulley 42. Corresponding to advance and retreat of the drive wire 32, the guide pulley 42 rotates around the pulley support shaft 44.
A wire guide member 50 is disposed adjacent to a lower end in the longitudinal direction of the guide rail 20. The drive wire 34 extends from the slider base 30 in a downward direction of the guide rail 20 along the guide rail 20, and is guided by the wire guide member 50. The wire guide member 50 is secured to the guide rail 20, and the drive wire 34 is supported such that the drive wire 34 is configured to advance and retreat along a wire guide groove formed on the wire guide member 50.
The drive wire 32 coming out from the guide pulley 42 is inserted through a tubular outer tube 32T and wound around a drive drum 70 disposed inside a drum housing 60 to which the outer tube 32T is coupled. The drive wire 34 coming out from the wire guide member 50 is inserted through a tubular outer tube 34T and wound around the drive drum 70 disposed inside the drum housing 60 to which the outer tube 34T is coupled.
As illustrated in
A motor unit 80 is mounted to the drum housing 60. The motor unit 80 includes a motor 81, a gear box 82 having a built-in reduction gear train that transmits rotation of an output shaft of this motor 81 while decreasing the rotation, and a fitting shaft (a rotation shaft, an output shaft) 83 (
The outer tube 32T has one end coupled to the pulley bracket 40 and the other end coupled to the drum housing 60, and the drive wire 32 is configured to advance and retreat in the outer tube 32T having thus determined both end positions. The outer tube 34T has one end coupled to the wire guide member 50 and the other end coupled to the drum housing 60, and the drive wire 34 is configured to advance and retreat in the outer tube 34T having thus determined both end positions.
The drum housing 60 is secured to the door panel (not illustrated) of the vehicle. When the driving force of the motor 81 positively/reversely rotates the drive drum 70, one of the drive wire 32 and the drive wire 34 increases a winding amount around the spiral groove 74 of the drive drum 70, and the other is drawn out from the spiral groove 74 of the drive drum 70, thus causing the slider base 30 to move along the guide rail 20 due to a relationship of pulling and loosening between the drive wire 32 and the drive wire 34. Corresponding to the move of the slider base 30, the window glass moves up and down.
As illustrated in
The bottom portion 61A of the drum housing 60 includes a drum support base 64 formed in an approximately circular shape in plan view. The drive drum 70 is inserted into the drum housing portion 61 in a state where the planar sliding portion (the sliding portion) 76 is placed on the drum support base 64. The drum support base 64 includes a shaft protrusion 64A in a bifurcated shape in the center, and the drive drum 70 includes a smooth cylindrical surface 72A on a part of the shaft fitting hole 72 (
The bottom portion 61A of the drum housing 60 includes a slide bead (a sliding portion, a protrusion) 65 in an approximately circular shape in plan view so as to surround the shaft protrusion 64A of the drum support base 64. This slide bead 65 projects toward the planar sliding portion (the sliding portion) 76 of the drive drum 70 in a state where the drive drum 70 is housed and supported to the drum housing 60. Rotating the drive drum 70 with respect to the drum housing 60 causes the planar sliding portion (the sliding portion) 76 and the slide bead (the sliding portion, the protrusion) 65 as the sliding portions of the drive drum 70 and the drum housing 60 to slide (slidingly contact). A grease (a lubricant) is applied over this sliding portion (a slidingly-contact portion) to ensure smooth performances of the drive drum 70 and the drum housing 60.
With reference to mainly
The motor unit 80 includes three boss portions 85 projecting toward the drum housing 60. The boss portions 85 each have an inner surface on which a small-diameter screw hole (a screw hole) 85A, a medium-diameter through hole 85B, and a large-diameter through hole 85C are formed in an order from a distal end side (a drum housing 60 side). On each distal end side (the drum housing 60 side) of the boss portions 85, a tapered surface (a diameter-reducing tapered surface) 86 having a diameter reduced toward the distal end side (the drum housing 60 side) is formed. This tapered surface 86 has a most distal end portion (a most drum housing 60 side) on which a metallic distal end abutting portion 87 is formed. The metallic distal end abutting portion 87 may be integrally molded with the boss portion 85 of the motor unit 80, or the metallic distal end abutting portion 87 manufactured as a different member may be coupled to the boss portion 85 of the motor unit 80.
The drum housing 60 includes three boss receiving portions 66 that receive the three boss portions 85 of the motor unit 80. The boss receiving portions 66 each have an inner surface on which a reverse tapered surface (a diameter-expanding reverse tapered surface) 67 and an insertion hole 68 are formed in an order from a distal end side (a motor unit 80 side). The reverse tapered surface 67 has a diameter expanded toward the boss portion 85 (corresponding boss portion 85). The insertion hole 68 is continuous with a minimum diameter portion of this reverse tapered surface 67, and has an approximately constant diameter.
The tapered surface 86 of the motor unit 80 is configured to have a size and a shape so as to be gotten into the reverse tapered surface 67 of the drum housing 60. The distal end abutting portion 87 of the motor unit 80 is configured to have a diameter approximately identical to the diameters of the minimum diameter portion of the reverse tapered surface 67 and the insertion hole 68 of the drum housing 60.
The reverse tapered surface 67 of the drum housing 60 and the tapered surface 86 of the motor unit 80 mutually face, and have different taper angles. In this embodiment, the reverse tapered surface 67 of the drum housing 60 has the taper angle larger than (steeper than) the taper angle of the tapered surface 86 of the motor unit 80. In this embodiment, a surface connecting a maximum diameter portion of the tapered surface 86 to the most distal end portion of the distal end abutting portion 87 of the motor unit 80 has a taper angle approximately identical to the taper angle of the reverse tapered surface 67 of the drum housing 60.
As apparent in
The motor unit 80 is joined (secured) to the drum housing 60 at the respective three boss portions 85 and boss receiving portions 66 with respective three metallic screw members (the securing member, for example, tapping screws) 90. The screw members 90 each have an engagement head portion 91 engaged with a peripheral edge portion of a surface on an opposite side of the reverse tapered surface 67 of the insertion hole 68 of the drum housing 60, a large-diameter insertion portion 92 inserted through the insertion hole 68 of the drum housing 60, a small-diameter screw portion 93 screwed into the small-diameter screw hole 85A formed on the boss portion 85 of the motor unit 80, and a step abutting portion 94 formed between the large-diameter insertion portion 92 and the small-diameter screw portion 93.
When joining (securing) the motor unit 80 to the drum housing 60 configured as described above, the three boss portions 85 of the motor unit 80 and the three boss receiving portions 66 of the drum housing 60 are roughly positioned, and both are brought closer together. Then, the tapered surfaces 86 and the distal end abutting portions 87 of the respective boss portions 85 are led (guided) to the reverse tapered surfaces 67 of the respective boss receiving portions 66. Accordingly, the motor unit 80 and the drum housing 60 can be stably assembled without requiring a high positioning accuracy. The above-described configuration eliminates a need for forming the three boss portions 85 and the three boss receiving portions 66 with high accuracies, thus ensuring simplification and cost reduction of manufacturing.
In a temporarily assembled state before joining (securing) the motor unit 80 to the drum housing 60 with the screw member 90, the tapered surfaces 86 and the distal end abutting portions 87 of the respective boss portions 85 of the motor unit 80 can contact the reverse tapered surfaces 67 of the respective boss receiving portions 66 of the drum housing 60.
In contrast, in an assembled state after joining (securing) the motor unit 80 to the drum housing 60 with the screw member 90, as illustrated in
The motor unit 80 and the drum housing 60 have “positioning abutting portions” in a direction where both face one another on positions other than between the respective boss portions 85 and the reverse tapered surfaces 67 of the respective boss receiving portions 66 (positioning abutting portions of the motor unit 80 and the drum housing 60 via the screw member 90). The number, the positions, the shapes and the like of the “positioning abutting portions” have freedom of choice, and the design can be variously changed. For example, an aspect in which “the positioning abutting portion” is disposed on a part where a joined body of the motor unit 80 and the drum housing 60 is fixed (fastened together) to a door panel (not illustrated) of a vehicle is employable. An aspect in which “the positioning abutting portions” are disposed on facing surfaces of the drum housing portion 61 of the drum housing 60 and the motor unit 80 is employable.
As illustrated in
As illustrated in
Here, in assembling the motor unit 80 with the drum housing 60, preferably, a serration of the fitting shaft 83 of the motor unit 80 is in a specific (desired) rotation phase with a serration of the shaft fitting hole 72 of the drive drum 70. However, in actual assembling, it is highly likely that displacement of the rotation phase occurs between both serrations. In this embodiment, even if the displacement of the rotation phase has occurred between both serrations, the reverse tapered surface 67 of the boss receiving portion 66 of the drum housing 60 absorbs (accepts) the displacement of the rotation phase when receiving the boss portion 85 of the motor unit 80, thus ensuring the assembling. Then, after once the reverse tapered surface 67 of the boss receiving portion 66 of the drum housing 60 has received the boss portion 85 of the motor unit 80, simply rotatably driving the drive drum 70 by the motor unit 80 ensures the specific (desired) rotation phase between both serrations.
In
Thus, according to the embodiment, the motor unit 80 includes a plurality of the boss portions 85 that project toward the drum housing 60, the drum housing 60 includes a plurality of the boss receiving portions 66 that receive the plurality of the boss portions 85, at least one of the plurality of the boss receiving portions 66 has the reverse tapered surface 67 that has the diameter expanded toward the corresponding boss portion 85, and the clearance CL is disposed between the boss portion 85 and the reverse tapered surface 67 in a state where the motor unit 80 and the drum housing 60 are supported. The motor unit 80 and the drum housing 60 have the positioning abutting portions (for example, the locking claw 69 of the drum housing 60 and the locking claw hook portion 88 of the motor unit 80, and/or the distal end abutting portion 87 of the boss portion 85 of the motor unit 80 and the lower end abutting portion 105 of the collar member 100 are included, while the positioning abutting portion is not limited to them) in the direction where the motor unit 80 and the drum housing 60 face one another (the direction where the plurality of the boss portions 85 and the plurality of the boss receiving portions 66 face one another) on the position other than between the boss portion 85 and the reverse tapered surface 67 (the positioning abutting portions of the motor unit 80 and the drum housing 60 via the screw member 90). Accordingly, the drum housing 60 and the motor unit 80 can be stably assembled without requiring the high positioning accuracy.
In the above-described embodiment, an exemplary case has been described where the driving device for the vehicular opening-closing body of the present invention is applied to the supporting structure of the drum housing 60 and the motor unit 80 of the window regulator 10. However, the driving device for the vehicular opening-closing body of the present invention is applicable to another supporting structure of a supporting member and a supported member for a vehicle.
In the above-described embodiment, an exemplary case has been described where the motor unit 80 and the drum housing 60 have the three boss portions 85 and the three boss receiving portions 66 (the reverse tapered surfaces 67), respectively. However, the number of sets of the boss portion and the boss receiving portion (the reverse tapered surface) is not limited to this, and the design can be variously changed. For example, the number of sets of the boss portion and the boss receiving portion (the reverse tapered surface) may be two, or four or more. Note that, for stably supporting the motor unit 80 and the drum housing 60, preferably, the number of sets of the boss portion and the boss receiving portion (the reverse tapered surface) is at least three or more.
In the above-described embodiment, an exemplary case has been described where every (three) boss receiving portion 66 of the drum housing 60 has the reverse tapered surface 67. However, an aspect where only a part (for example, one or two boss receiving portions 66 among the three boss receiving portions 66) of the boss receiving portions 66 of the drum housing 60 includes the reverse tapered surface 67 may be employed.
While, in the above-described embodiment, an exemplary case has been described where the boss portion 85 of the motor unit 80 has the tapered surface 86, an aspect where the tapered surface 86 is omitted and the boss portion 85 of the motor unit 80 has an approximately constant diameter may be employed.
In the above-described embodiment, an exemplary case has been described where, in the assembled state after joining (securing) the motor unit 80 to the drum housing 60 with the screw member 90, the tapered surfaces 86 and the distal end abutting portions 87 of the respective boss portions 85 of the motor unit 80 are not in contact with the reverse tapered surfaces 67 of the respective boss receiving portions 66 of the drum housing 60. However, an aspect where the tapered surfaces 86 and the distal end abutting portions 87 of the respective boss portions 85 of the motor unit 80 are partially in contact with the reverse tapered surfaces 67 of the respective boss receiving portions 66 of the drum housing 60, and the clearance CL is disposed between both sides may be employed.
In the above-described embodiment, an exemplary case has been described where the motor unit 80 includes the boss portion 85 and the drum housing 60 includes the boss receiving portion 66 (the reverse tapered surface 67). However, having the reversed positional relationship, an aspect where the drum housing includes the boss portion and the motor unit includes the boss receiving portion (the reverse tapered surface) may be employed.
The driving device for the vehicular opening-closing body of the present invention is preferably applied to, for example, a window regulator configured to move a window glass of a vehicle up and down.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2016-095307 | May 2016 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2017/011223 | 3/21/2017 | WO | 00 |
