JP2007063885A - Drive unit of opening/closing body for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive unit of an opening/closing body for a vehicle which can effectively absorb impact loads applied to tension rollers. <P>SOLUTION: This tension mechanism 14 comprises: the pair of tension rollers 15 which are brought into contact with respective wires 13a and 13b between the opening/closing body and an output rotator 11, and can be moved in the direction of tensioning or loosening the respective wires 13a and 13b; a main urging means 17 for constantly urging the respective tension rollers 15 in the direction of tensioning the respective wires 13a and 13b; and an auxiliary urging means 18 for urging both the tension rollers 15 in the direction of tensioning the respective wires 13a and 13b by coming into pressure-contact with the respective tension rollers 15 when the pair of tension rollers 15 is moved by a predetermined amount in the direction of loosening the respective wires 13a and 13b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a driving device that opens and closes an opening / closing body such as a sliding door of an automobile, and more particularly to a wire tension structure provided on the driving device.

  The drive device that automatically opens and closes the slide door rotates the output drum by a motor that can rotate forward and backward, and winds the two wires connected to the slide door around the output drum so as to be wound and fed out. Thus, it is general that the sliding door can be opened and closed with the driving force of the motor.

Such a drive device is usually provided with a tension device for absorbing the slack of the wire. As a conventional drive device including such a tension device, for example, it is described in Patent Document 1. In addition, there is one in which a compression coil spring is used as an urging means for urging the wire by a tension roller to apply tension to the wire.
JP 2002-227944 A

  When moving an opening / closing body with a relatively large mass, such as a sliding door, from the stationary state to the fully open or fully closed position, it is brought into the winding side of the wire immediately after starting the motor due to its static inertia and frictional resistance of each part. A large tension acts and a large impact load is applied to the tension roller.

  In the case of applying tension to a wire by a single compression coil spring as in the tension device described in Patent Document 1, the compression coil spring bends when an impact load is applied to the tension roller as described above. If the tension roller is cut and the tension roller moves to the extreme position, the impact load may not be absorbed.

  To deal with this problem, it is conceivable to use a compression coil spring with a large spring constant, but in this case, a large tension always acts on the wire, so the sliding door is normally opened and closed by the drive unit. Even when the motor is being operated, not only a large load is applied to the motor, but also the operating force when manually opening and closing the slide door may increase.

  The present invention has been made in view of the above problems, and can effectively absorb the impact load applied to the tension roller, and can reduce the load on the motor and the operating force when manually opening and closing the opening / closing body. An object of the present invention is to provide a drive device for a vehicle opening / closing body.

According to the present invention, the above problem is solved as follows.
(1) The wire connected to the opening / closing body is wound around an output rotating body that is rotated by a motor capable of rotating in the forward and reverse directions, and one of the wires is wound by the output rotating body and the other wire is sent out. In the vehicle opening / closing body drive device that moves the opening / closing body in the opening or closing direction and absorbs the slack of the wire by the tension mechanism, the tension mechanism includes the opening / closing body and the output rotating body. A pair of tension rollers that contact the wire and move in a direction that tensions and relaxes the wire, and a main bias that constantly urges each tension roller in a direction that tensions the wire When the means and the pair of tension rollers move a predetermined amount in the direction of loosening the wire, they are pressed against each tension roller, Nrora and is intended to comprise an auxiliary biasing means for biasing in a direction to tension the wire.

(2) In the above item (1), the main biasing means and the auxiliary biasing means are each composed of a main compression coil spring and an auxiliary compression coil spring whose free length is shorter than that. They are fitted together to form a double spring structure.

(3) In the above item (1) or (2), the support shafts of both tension rollers are pivotally supported by guide members movably supported by a fixed body, and a main compression coil spring is provided at one end of the guide member. A holding portion that fits and holds the end portion on the tension roller side is provided.

(4) In the above item (3), a cylindrical member is loosely fitted between the main compression coil spring and the auxiliary compression coil spring.

(5) In the above item (4), the cylindrical member is provided with a collar portion on which the end surface on the tension roller side of the auxiliary compression coil spring contacts, and the end surface on the tension roller side of the cylindrical member can be pressed by the guide member. .

According to the present invention, the following effects can be achieved.
(A) According to the first aspect of the present invention, when a large tension acts on the wire immediately after starting the motor or the like, the tension roller moves in a direction to relax the wire against the main biasing means. Since the spring load of the auxiliary biasing means is added to the spring load of the biasing means, and the spring load is combined to obtain a large biasing force, the tension roller does not move to the extreme position and the impact applied to it. The load is absorbed effectively.

Further, in a normal state where no large tension is applied to the wire, the urging force of only the main urging means acts on the tension roller, so that the tensile load applied to the wire is reduced, and the load acting on the motor via the output rotating body is also reduced. It will be reduced.
Further, when manually opening and closing the open / close body, the tension roller is biased only by the main biasing means, and the tensile load applied to the wire is reduced, so that the manual operation force is reduced.

(B) According to the invention described in claim 2, since the main and auxiliary biasing means are both compression coil springs and they are fitted to each other to form a double spring structure, the tension mechanism becomes compact, The structure becomes simple.

(C) According to the invention described in claim 3, the tension roller can be pivotally supported by the guide member and smoothly moved, and the main compression coil spring is guided by the holding portion protruding from the guide member. Since it is compressed, the operation of the main compression coil spring and the tension roller is ensured.

(D) According to the invention described in claim 4, the main compression coil spring and the auxiliary compression coil spring are guided by the cylindrical member and smoothly expand and contract, and the two compression coil springs are prevented from being entangled with each other. The

(E) According to the invention described in claim 5, since the auxiliary compression coil spring moves together with the cylindrical member and is compressed while being guided by this, the operation of the auxiliary compression coil spring becomes more reliable.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a minivan or wagon type vehicle to which the present invention is applied. A slide door (1) as an opening / closing body is provided with guide rails (3) (4) (4) provided on the side of a vehicle body (2). 5) is slidably supported in the front-rear direction, and the driving device (6) of the present invention provided in the rear panel of the vehicle body (2) closes the entrance / exit (2a) on the side surface of the vehicle body (2). It is driven to open and close between the closed position and the fully open position that moves backward along the vehicle body (2) and opens the entrance / exit (2a) while moving slightly outward from the side surface of the vehicle body (2). It is like that.

  In the rear part of the sliding door (1), the sliding door (1) is fully engaged by engaging with a striker (not shown) provided at an appropriate position on the rear edge of the opening of the entrance (2a) on the vehicle body (2) side. A door latch (7) is provided for holding in the closed position.

  As shown in the partially cutaway side view as seen from the vehicle interior side in FIG. 2, the driving device (6) is fixed to the vehicle body and is attached to one surface of a base plate (8) as a fixed body. A motor (9) that can rotate and a pivot (10) that faces in a direction intersecting the rotation axis of the motor (9), and is rotated at a reduced speed by a worm that is fixedly fitted to the rotation shaft of the motor (9). A worm wheel (both not shown), an output drum (11) that is also pivotally fitted to the pivot (10) and can be rotated forward and backward by rotation of the worm wheel, and this output drum (11) Provided between the worm wheel and an electromagnetic clutch (not shown because it is publicly known) that electrically connects and disconnects them. The output drum (11) and the electromagnetic clutch are attached to the other surface of the base plate (8). In a fixed housing (12) To have.

On the outer peripheral surface of the output drum (11), one end is connected to the output drum (11) and the other end is connected to the opening side and the closing side of the sliding door (1). ) And a wire (13b) for opening the door are wound so as to be wound and fed out.
The fixing portions (13c) and (13d) for guiding and holding the wires (13a) and (13b) are disposed below compression coil springs (17) and (18), which will be described later, as shown in FIG. Therefore, the drive device (6) in the vehicle front-rear direction can be reduced in size.

  When the output drum (11) is rotated in the opening direction (clockwise in FIG. 2) by the driving force of the motor (9), the wire (13b) is taken up and the wire (13a) is sent out to slide. The door (1) moves in the opening direction. On the contrary, when the output drum (11) is rotated in the closing direction (counterclockwise in FIG. 2), the wire (13a) is wound and the wire (13b) is sent out, so that the sliding door (1) moves in the closing direction.

  Under the output drum (11), in the housing (12), tension is applied to both the wires (13a) and (13b) to prevent them from loosening, and the impact load to the tension roller (15) described later is absorbed. A pair of front and rear tension mechanisms (14 and 14) described below will be provided.

  Since both tension mechanisms (14) are symmetrical and have the same structure, only the rear (left side in the figure) of FIG. 2 will be described.

  As shown in the enlarged sectional views of FIGS. 3 and 4, the tension mechanism (14) includes a tension roller (15) whose outer peripheral surface is recessed, a guide member (16) that supports and guides the tension roller (15), A long main compression coil spring (17) and an auxiliary compression coil spring (18) having a larger diameter and a shorter free length are provided. The auxiliary compression coil spring (18) is fitted on the main compression coil spring (17) to form a double spring structure.

  The guide member (16) has a left and right pair of support pieces (16a) in the center of the front end portion, and has a U-shape facing backward as viewed from the side. Grooves (19) and (19) are formed, and a pair of support shafts (20) and (20) facing in the left-right direction in the tension roller (15) accommodated in the guide member (16) by both support grooves (19) Is pivotally supported.

  One support piece (16a) opposite to the base plate (8) of the guide member (16) is a pair of upper and lower guide ribs (21) (21) (21) ) And a base plate (8) is provided close to the outer surface of the other support piece (16a).

  On the opposing surface of the base plate (8) and the housing (12), there are provided guide long holes (22) and (22) that face in the front-rear direction and project outwardly on the opening edge of the guide piece (22a). The guide long holes (22) have a pair of guide pieces (19a) (19a) projecting from the opening edge of the support groove (19) in the two support pieces (16a) of the guide member (16). Are slidably fitted in the front-rear direction.

  Thus, the guide member (16) and the tension roller (15) supported thereby are supported by the base plate (8) and the housing (12), and move stably in the front-rear direction within the housing (12). It can be done.

  On the rear end surface of the guide member (16), a convex holding part (23) having a hollow inside is integrally connected so as to face the rear, and the convex holding part (23) The front end portion of the main compression coil spring (17) is fitted and held, and the front end abuts on the rear end of the enlarged diameter portion (23a), so that the main compression coil spring (17) is a tension roller (15). As the guide member (16) moves rearward, the guide member (16) is compressed while being guided by the convex holding portion (23).

  On the inner surface of the rear end of the convex holding part (23), an abutment piece (23c) that protrudes toward the tension roller (15) and whose front end is close to the outer peripheral surface of the tension roller (15) is integrally projected. Has been.

  The rear end portion of the main compression coil spring (17) and the auxiliary compression coil spring (18) are accommodated in a recess (24) formed in the lower end of the rear end of the housing (12). ).

  On the inner surface of the rear wall (12a) facing the convex holding portion (23), a stopper protrusion (25) is provided which can contact the rear end of the convex holding portion (23).

  In the recess (24), between the rear end portion of the main compression coil spring (17) and the auxiliary compression coil spring (18), a cylindrical member (26) having an enlarged diameter flange portion (26a) on the outer peripheral surface of the front end portion. ) Is loosely fitted.

  The front end of the auxiliary compression coil spring (18) is in pressure contact with the rear surface of the enlarged diameter flange (26a) of the cylindrical member (26), and the front surface of the enlarged diameter flange (26a) is in the housing (12). In contact with the stopper protrusion (27) projecting inwardly at the front end of the recess (24), in this contact state, the front end of the cylindrical member (26) is forward of the stopper protrusion (27), That is, while projecting toward the guide member (16), the rear end is also spaced apart from the inner surface of the rear wall (12a) by a required dimension.

  The inner diameter of the cylindrical member (26) is slightly larger than the outer diameter so that the enlarged diameter portion (23a) of the convex holding portion (23) is loosely fitted. ) Comes into contact with the rear end surface of the large-diameter flange portion (23b) of the base portion of the convex holding portion (23) before the main compression coil spring (17) is fully bent.

  In the front and rear tension mechanisms (14) and (14) configured as described above, the guide member (16) and the tension roller (15) pivotally supported by the guide member (16) are mutually connected by the urging force of the main compression coil spring (17). It is always urged in the approaching direction, that is, the direction in which the wires (13a) and (13b) are tensioned, and can move independently in the front-rear direction in the direction away from each other, that is, the direction in which the wires (13a) and (13b) are relaxed. it can. On the opposing surface side of the front and rear tension rollers (15) and (15), the closing wire (13a) and the opening door (13b) pulled out from the output drum (11) are hung, respectively. Initial tension is applied to (13a) and (13b).

  For example, when the motor (9) is operated to open the sliding door (1) in the fully closed position and the output drum (11) is rotated clockwise in FIG. 2, the opening wire (13b ) Is wound around the output drum (11), the wire (13b) is tensioned, and the tension roller (15) tends to move backward. However, the tension roller (15) in the rear tension mechanism (14) and the guide member (16) supporting it are urged forward by the main compression coil spring (17). The large rearward movement is restricted, and as shown in FIG. 5, the main compression coil spring (17) is moved backward by the amount of bending.

  When the sliding door (1) is moved from the stationary state to the opening direction, a large tension acts on the wire (13b) immediately after the start of the motor (9) due to the stationary inertia force and frictional resistance of each part. The roller (15) and the guide member (16) move further rearward from the state of FIG. Then, as shown in FIG. 6, before the main compression coil spring (17) is fully bent, the rear end surface of the large diameter flange (23b) of the convex holding portion of the guide member (16) is the cylindrical member (26). By abutting the front end, this is pushed backward.

  Accordingly, the auxiliary compression coil spring (18) whose front end is in contact with the enlarged diameter flange portion (26a) of the cylindrical member (26) is also compressed at the same time, and the main compression coil spring (17) that has been compressed so far When the spring load of the auxiliary compression coil spring (18) is added to this spring load, a large biasing force can be obtained by the combined spring load.

  As a result, the tension roller (15) does not move to the rear limit position immediately after the start of the motor (9), so that the impact load applied to the tension roller (15) is effectively absorbed, and the wire (13b) and tension The durability of the roller (15) is improved.

  In the unlikely event that the tension roller (15) exceeds a predetermined maximum movement region, the tip of the convex holding portion (23) is not allowed before the main and auxiliary compression coil springs (17) and (18) are fully bent. Is in contact with the stopper protrusion (25) and the front end face of the stopper protrusion (27) is in contact with the rear end face of the large-diameter flange (23a), so that both compression coil springs (17) and (18) There is no fear.

  Further, when a large load is applied to the tension roller (15) and the both support pieces (16a) are bent in the left-right direction (vertical direction in FIG. 2), the outer peripheral surface of the tension roller (15) Since the abutment piece (23c) projecting from the convex holding portion (23) abuts against the tip of the abutment piece (23c) to prevent the tension roller (15) from moving backward, as shown in FIG. ) Is not brought into contact with the rear end of the guide long hole (22), and a load is prevented from being applied to the support shaft (20) of the tension roller (15).

  In a normal state where the motor (9) is not started, that is, in a normal state where the sliding door (1) is moving, a large tension does not act on the wire (13b), so that the tension roller is applied only by the spring load of the main compression coil spring (17). (15) is activated.

  Accordingly, the tensile load applied to the wire (13b) is reduced, and the load acting on the motor (9) via the output drum (11) is reduced. Further, when the sliding door (1) is manually closed, only the main compression coil spring (17) is compressed by the tension acting on the wire (13b), so that the manual operation force is reduced.

  Although a detailed description is omitted, when the door (13a) is wound around the output drum (11) and the slide door (1) is closed, the front tension mechanism (14) is the same as described above. Since it operates, it is possible to prevent an impact load from being applied to the front tension roller (15) immediately after the motor (9) is started.

The present invention is not limited to the above embodiment.
In the embodiment described above, the auxiliary compression coil spring (18) is compressed, the main compression coil spring (17) and the auxiliary compression coil spring (18) are prevented from being entangled and the main compression coil spring (17) is expanded and contracted. In order to make it more reliable, a cylindrical member (26) is provided between them, but this cylindrical member (26) is omitted, and the auxiliary coil spring (18) is connected to the convex holding portion (23). You may make it press directly by a large diameter collar part (23b). At this time, the stopper protrusion (27) provided in the recess (24) of the housing (12) is not necessary.

  Further, the outer diameter of the stopper projection (25) is made substantially equal to the inner diameter of the main compression coil spring (17), or the outer peripheral surface of the auxiliary compression coil spring (18) is placed on the base plate (8) or the housing (12). If the compression coil springs (17) and (18) are restricted from moving in the radial direction by, for example, being brought close to the inner surface of the recess (24), the main compression coil spring (17) and the auxiliary compression coil spring Tangled with (18) can be prevented.

The convex holding portion (23) may be cylindrical, and one end portion of the main compression coil spring (17) may be fitted and held therein.
Further, the auxiliary compression coil spring (18) may have a smaller diameter than the main compression coil spring (17) and may be fitted therein. In this case, the convex holding portion (23) may be short and the auxiliary compression coil spring (18) may be compressed by the tip.

  In the above embodiment, the maximum movement amount of the tension roller (15) is regulated by the tip of the convex holding portion (23) coming into contact with the stopper projection (25). When the length of (23) is reduced, the maximum diameter of the tension roller (15) is regulated by bringing the large diameter flange (23b) into contact with the stopper protrusion (27) of the housing (12). You may make it do.

In the above embodiment, the pair of tension rollers (15) are moved in the front-rear direction. However, the tension rollers (15a) (13b) are tensioned from above by making them movable in the vertical direction. Sometimes it does.
Instead of the compression coil springs (17) and (18), the main biasing means and the auxiliary biasing means may be leaf springs with different mounting positions in the front-rear direction.

  As described above, the present invention is not limited to opening and closing the sliding door (1) using the two wires (13a) and (13b), but also to opening and closing the sliding door (1) with one wire. Can be applied. In this case, both ends of the wire are connected to the slide door (1) and wound around the output drum (11), or an engaging portion is provided in the middle portion in the length direction of the wire. The joining portion may be engaged with the slide door (1) and both ends of the wire may be engaged with the output drum (11).

1 is a side view of a vehicle to which the present invention is applied. It is a partially cutaway side view of the drive device of the present invention. FIG. 3 is an enlarged cross-sectional plan view taken along line III-III in FIG. 2. Similarly, it is a side view showing a part of the tension mechanism on the front side. Similarly, it is a side view when the tension roller moves forward by compressing the main compression coil spring. Similarly, it is a side view when the tension roller further compresses the auxiliary compression coil spring and moves further forward.

Explanation of symbols

(1) Sliding door
(2) Body
(2a) Entrance
(3) (4) (5) Guide rail
(6) Drive device
(7) Door latch
(8) Base plate (fixed body)
(9) Motor
(10) Axis
(11) Output drum (output rotating body)
(12) Housing (fixed body)
(12a) Rear wall
(13a) (13b) wire
(13c) (13d) fixed part
(14) Tension mechanism
(15) Tension roller
(16) Guide member
(16a) Support piece
(17) Main compression coil spring
(18) Auxiliary compression coil spring
(19) Support groove
(19a) Guide piece
(20) Spindle
(21) Guide rib
(22) Guide slot
(22a) Guide piece
(23) Convex holding part (holding part)
(23a) Expanded part
(23b) Large diameter buttock
(23c) Contact piece
(24) Recess
(25) Stopper protrusion
(26) Cylindrical member
(26a) Expanded collar (buttock)
(27) Stopper protrusion

Claims (5)

A wire connected to the opening / closing body is wound around an output rotating body that is rotated by a motor capable of rotating in the forward / reverse direction, and one of the wires is wound by the output rotating body and the other wire is sent out, whereby the opening / closing body is In the drive device for a vehicle opening / closing body that is moved in the opening or closing direction and that can absorb the slack of the wire by a tension mechanism,
The tension mechanism is in contact with the wire between the opening / closing body and the output rotating body, and is capable of moving in a direction in which the wire is tensioned and in a direction in which the wire is relaxed, and each tension roller, When the main urging means that constantly urges the wire in the direction of tensioning and the pair of tension rollers move a predetermined amount in the direction of relaxing the wire, the tension rollers are pressed against each tension roller, An auxiliary biasing means for biasing the wire in a tensioning direction is provided.   The main biasing means and the auxiliary biasing means are each composed of a main compression coil spring and an auxiliary compression coil spring whose free length is shorter than the main compression coil spring. A drive device for a vehicle opening / closing body, characterized by having a structure.   The support shafts of both tension rollers are pivotally supported by guide members that are movably supported by the fixed body, and the end portions of the main compression coil spring on the tension roller side are fitted and held at one end of the guide members. The drive device for a vehicle opening / closing body according to claim 1 or 2, wherein a holding portion is provided in a protruding manner.   The drive device for a vehicle opening / closing body according to claim 2 or 3, wherein a cylindrical member is loosely fitted between the main compression coil spring and the auxiliary compression coil spring. 5. The cylindrical member is provided with a collar portion with which the end surface on the tension roller side of the auxiliary compression coil spring contacts, and the end surface on the tension roller side of the cylindrical member can be pressed by the guide member. Drive device for vehicle opening / closing body.

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