JPH0790750B2 - Belt reacher device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention moves one end of a seat belt between a standby position behind the front seat and a use position in front of the backrest of the front seat. The present invention relates to a belt reacher device for performing the operation.

<Prior art> After ensuring the ease of wearing the seat belt in the front seat,
As an auxiliary device to prevent getting in and out of the rear seat of a two-door vehicle, when the door is opened, the end of the seat belt moves near the floor between the front seat and the rear seat, and the door is opened. A belt reacher device configured to move the end portion of the seat belt toward the front side of the backrest of the front seat when closed is already in practical use. As one type of the belt reacher device, an arm having an end portion of a seat belt connected to the free end is pivotally attached to a rear side surface of a front seat, and the arm is pivoted on a side of a backrest. There are known ones (see JP-A-61-110647, etc.).

<Problems to be Solved by the Invention> By the way, when the motor is used for driving the arm, it is considered appropriate to dispose the driving device on the lower surface of the seat. However, according to this, since the drive device and the arm are spaced from each other, the transmission mechanism for transmitting the rotational force of the drive device to the arm tends to be complicated. Therefore, it is difficult to reduce the number of assembling steps, or the cushioning property of the seat has to be sacrificed to some extent in order to secure the accommodation portion of the drive device on the lower surface of the seat.

The present invention has been devised in order to improve such inconvenience, and its main object is to provide an improved belt reacher device so that the structure can be made compact and the assembling process can be reduced. Especially.

[Structure of the Invention] <Means for Solving the Problems> According to the present invention, an object capable of rotating back and forth on the side of the backrest of the front seat is to attach a seat belt. A drive unit for giving rotational force to the arm, a driven member to which the drive force of the drive unit is directly transmitted, an arm connecting member to which the arm is integrally connected, and a lost motion action for interlocking between them. A belt leecher device having a damper unit composed of a spring means for imparting is connected to the output shaft of the drive unit and the driven member with an endless conduction band, and a tamper unit is provided between the damper unit and the drive unit. This is achieved by adopting a configuration in which the are connected by a connecting frame member that rotatably supports. Particularly preferably, the connecting frame member is sandwiched between the driven member and the arm connecting member, and the connecting frame member is provided with a cover-like portion that partially covers the endless conduction band wrapped around the driven member, and Protrusions facing the outer peripheral surface of the conduction band with a minute gap may be formed on the inner peripheral surface of the cover-shaped portion, and further, stopper means for defining the rotation limit of the intermediate member is provided on the connecting frame member. And good.

<Operation> According to the above device, the output of the drive unit is transmitted to the driven member by the endless transmission band, but the drive force from the standby position to the use position is the first spring means from the driven member to the intermediate member. And is transmitted from the intermediate member directly to the arm connecting member, that is, the arm. Therefore,
The resistance acting on the arm is absorbed by the bending of the first spring means. On the contrary, the driving force from the use position to the standby position is directly transmitted from the driven member to the intermediate member, and is transmitted from the intermediate member to the arm connecting member, that is, the arm via the second spring means. Therefore, the resistance acting on the arm is absorbed by the bending of the second spring means.

If an endless transmission belt such as a timing belt is used, the output shaft of the drive unit and the input shaft of the damper unit can be arranged in parallel with each other, so that the drive unit and the damper unit can be shared. It can be mounted on a flat surface. And in this case,
If the connecting frame member is provided between the drive unit and the damper unit, the drive unit and the damper unit can be integrated in advance, so that they can be handled as a sub-assembly.
Further, the endless transmission band can be prevented from coming off from the driven member by the protrusion provided on the inner peripheral surface of the gabber-shaped portion of the connection frame member that connects the damper unit and the drive unit. In addition, since the range of rotation of the intermediate member in the damper unit is defined by the stopper of the connecting frame member, the position of the intermediate member serves as a reference, and the arm position is kept normal even when the Yoshimune electric motor overruns. Be done.

<Examples> The configuration of the present invention will be described in detail below based on specific examples shown in the accompanying drawings.

FIG. 1 shows the entire front seat side to which the belt reacher device 1 is applied. A seat belt 4 pulled upward from a retractor device 3 provided in the vicinity of the root of a center pillar 2 in a vehicle compartment is a center seat. The pillar 2 is folded downward after passing through a through ring 5 provided on the upper portion of the pillar 2, and its end is connected to a guide end of a feeder arm 6.

The feeder arm 6 is rotatably pivoted at its base end in the vicinity of a pivotal joint between the seat 7a and the backrest 7b of the front seat 7, and is responsive to the opening / closing operation of a door (not shown). However, when the door is closed, it is shown by a solid line, that is, in the use position on the side A of the arrow, and when the door is opened, it is shown by an imaginary line. That is, it is configured to turn and move toward the standby position on the B side of the arrow.

In this way, when the door is opened, the seat belt 4 does not move to the position along the center pillar 2 so as not to interfere with getting in and out of the rear seat, and when the door is closed, the seat belt 4 is held by the front seat occupant's hand. It will move to a position that is easy to reach.

As shown in detail in FIG. 2, the belt reacher device 1 includes a drive unit P in which a speed reducer 11 and an electric motor 12 are integrally connected, a relay circuit unit C for controlling the drive unit P, and a drive circuit. It comprises a damper unit D for transmitting the rotational force of the unit P to the feeder arm 6. Here, the relay circuit unit C is integrated with the drive unit P via an extension member 13 fixed to the housing 11a of the speed reducer 11.

As shown in FIG. 3 as well, the damper unit D includes a driven member 15 having a timing pulley 15a formed therein for transmitting the driving force of the driving unit P to the feeder arm 6 via the timing belt 14, and the driven member 15. An intermediate member 16 that is rotatably fitted to an inner diameter sleeve 15b formed in the center of the feeder member 6, and an intermediate member 16 that is also rotatably fitted to an inner diameter sleeve 15b of the driven member 15, and And an arm connecting member 17 for holding.

Between the driven member 15 and the intermediate member 16, there is a driven member.
A relatively large first torsion coil spring 18 for urging the intermediate member 1 to rotate in the direction of arrow U with respect to 15 is provided. The first torsion coil spring 18 has one end 18a engaged with a protrusion 15d formed on the side wall of the driven member 15 and the other end 18b formed on the flange portion 16a of the intermediate member 16.
It is attached to 16b, and is attached in a slightly retracted state.

Between the intermediate member 16 and the arm connecting member 17, the intermediate member 16
On the other hand, there is provided a second torsion coil spring 19 having a relatively small diameter for biasing the arm connecting member 17 to rotate in the direction of the arrow W. The second torsion spring 19 has its one end 19a engaged with a projection 16c formed on the side wall of the intermediate member 16 and the other end 19b.
Is attached to the protrusion 17a formed on the side wall of the arm connecting member 17, and is mounted in a state in which it is slightly wound.

These driven member 15, intermediate member 16, and intermediate member 16
Arc-shaped grooves 16d and 16e extending over a predetermined angle are provided on both surfaces of the intermediate member 16 on the axially opposed surfaces of the arm connection member 17 and the arm connection member 17, respectively, in order to define the mutual rotation range at a predetermined angle. These grooves 16d and 16e are formed on the arm connecting member 17.
Protrusions 15e and 17b that enter are respectively provided.

Here, the respective ends 18a and 18b of the first torsion coil spring 18, the respective projections 15d and 16b of the driven member 15 and the intermediate member 16, and the second
The joints between the ends 19a and 19b of the torsion coil spring 19 and the protrusions 16c and 17a of the intermediate member 16 and the arm connecting member 17 are hooked so as not to be disengaged not only in the circumferential direction but also in the axial direction. And the claw 15f formed at the diagonal position of the free end of the inner diameter sleeve 15b of the driven member 15
With the elastically engaging with the opening edge of the central hole 17c of the arm connecting member 17, the three members 15, 16 and 17 are integrally coupled and held to each other.

Connecting frame member for connecting between each of these members 15, 16 and 17 and the drive unit P in a state of being combined with each other
20 surrounds an outer diameter sleeve 15c formed adjacent to the timing pulley portion 15a in the driven member 15, and is sandwiched between the timing pulley portion 15a and the flange portion 16a of the intermediate member 16. .

Flange portion 16 of intermediate member 16 in connection frame member 20
Two stopper projections 20a, 20b for defining the rotation limit of the intermediate member 16 are provided on the surface facing the a in the axial direction. The flange portion 16a of the intermediate member 16 is provided with a radial projection 16f that can abut the projections 20a and 20b.

As shown in FIG. 4, the speed reducer 11 includes a small helical gear 23 fixed to an electric motor shaft 12a, a large helical gear 24 meshed with the small helical gear 23, a worm gear 25 integrally formed with the large helical gear 24, and a worm gear meshed therewith. It consists of wheels 26. The output shaft 27 that is integral with the worm wheel 26 that extends in a direction orthogonal to the motor shaft 12a
A small timing pulley 28 is fixed to the shaft end of the.

When connecting the damper unit D and the drive unit P configured as described above, the electric motor is attached prior to assembly.
12 is driven and preset so that the speed reducer 11 is in the standby position stopped state (the feeder arm 6 is located on the arrow B side in FIG. 1). In parallel with this, the driven member 15
The timing belt 14 is hung on the timing pulley portion 15a, and the position of the radial projection 16f of the intermediate member 16 is aligned with the middle of the mark 20f provided on the outer peripheral portion of the connecting frame member 20 (FIG. 5). Then, while maintaining this state, the small timing pulley 28 of the speed reducer 11 is hung on the timing belt 14. Thereby, the phase angles of the speed reducer 11 and the feeder arm 6 can be matched with each other. The connecting frame member 20 is formed with an extended portion 20d in the radial direction, and an elongated hole 20e provided therein is engaged with a protrusion 11b provided on the housing 11a of the speed reducer 11, and the protrusion 11b is provided. The drive ring 11 and the damper unit D are sub-assembled by fitting the stop ring 29 to the projection 11c provided on the above to prevent the stop ring 29 from coming off.

Next, by attaching the retainer roller 30 to the housing 11a of the speed reducer 11 with a minute gap on the outer peripheral surface of the timing belt 14 wound around the small timing pulley 28, the portion of the connecting frame member 20 that faces the outer peripheral surface of the timing belt 14. The timing belt 14 is prevented from jumping in cooperation with the protrusion 20c formed on the.

In this state, there is an appropriate radial play between the drive unit P and the damper unit D, and the timing belt 14 is in a slightly warm state.

Next, the inner hole of the inner peripheral sleeve 15b of the driven member 15 is fitted to the boss 31a projecting from the bracket 31 fixed to the side surface of the seat, and the anchor bolt 32 is tightened together with the feeder arm 6 to fix the extension member 13 and the bracket. The coil spring 33 is pulled between the locking pieces 13a and 31b formed on the
(Fig. 6). As a result, the drive unit P
Is urged in a direction (arrow T) away from the damper unit D, and accordingly, an appropriate tension is applied to the timing belt 14. As a result, the drive unit P moves together with the damper unit D by twisting the fixing bolts 34 into the tap holes 31c formed in the bracket 31 via the bolt holes 11d (three places) provided in the housing of the speed reducer 11a. The bracket 31 is fixed to the side surface of the seat.

Next, the configuration of the control circuit will be described with reference to FIG.

The anode of the battery B is connected to the first terminal connected to the +12 volt line of the circuit board CB via the fuse F.

One terminal of the door switch DS is connected to the ground line G, and the other terminal is connected to the second terminal of the circuit board CB. A room light RL is connected between the other terminal of the door switch DS and the anode of the battery B.

The 3rd terminal connected to the 0 volt line of the circuit board CB is
It is connected to the earth line G.

Worm wheel 26 which is the final stage gear of drive unit P
Rotor switch LS integrally provided on the axial end face of the
The common contact of is connected to the 4th terminal connected to the +12 volt line of the circuit board CB. The use position side stop contact of the rotary switch LS is connected to the 5th terminal of the circuit board CB, and the standby position side stop contact of the rotary switch LS is connected to the 8th terminal of the circuit board CB.

Both pole terminals of the electric motor 12 are connected to the 6th and 7th terminals of the circuit board CB, respectively.

Between the terminal 2 and the +12 volt line, a diode D8
And the coil of the door switch relay DR are connected in series.

The common terminal of the door switch relay DR is connected to the 0 volt line. The diode D1, the transistor T1, and the coil of the first relay MR1 for motor control are connected in series between the normally closed contact of the door switch relay DR and the fifth terminal. Further, a diode D3, a transistor T2, and a coil of a second relay MR2 for motor control are connected in series between the normally open contact of the relay and the eighth terminal.

The common terminal of the first relay MR1 is connected to terminal 6, the normally open contact of the relay is connected to the +12 volt line, and the normally closed contact of the relay is connected to the 0 volt line.

The common terminal of the second relay MR2 is connected to terminal 7, the normally open contact of the relay is connected to the +12 volt line, and the normally open contact is connected to the 0 volt line.

It should be noted that diodes D5, D6, and D7 for eliminating the back electromotive force are respectively connected to both ends of the coils of the relays MR1, MR2, and DR.

A resistor R3 is placed between the 5th terminal and the base of transistor T1.
The capacitor C1 and the resistor R1 are connected in series. At the same time, a resistor R4, a zener diode ZD1, a diode D2, and a resistor R1 are connected between each node between them and the emitter of the transistor T1.

A resistor R7 should be placed between pin 8 and the base of transistor T2.
The capacitor C2 and the resistor R6 are connected in series. At the same time, a resistor R8, a zener diode ZD2, a diode D4, and a resistor R5 are connected between each node between them and the emitter of the transistor T2.

Next, the operating procedure of the above embodiment will be described.

First, the state of FIG. 7 shows that the door switch DS is in the off state, that is, the door is in the closed state. Further, the rotary switch LS indicates that the feeder arm 6 is stopped at the use position side.

When the door is opened under this condition, the door switch DS is turned on and the room light RL is illuminated. At the same time, the coil of the door switch relay DR is excited, and the normally open contact of the relay and the common terminal are electrically connected. On the other hand, since the rotary switch LS has continuity between the common contact and the stop contact on the standby position side, from the +12 volt line, terminal 4 to rotary switch LS to terminal 8 to resistor R7 to capacitor C2 to
Current flows from the resistor R6 to the base of the transistor T2, and the transistor T2 becomes conductive. As a result, the coil of the second relay MR2 is excited and the common terminal of the second relay MR2 is electrically connected to the normally open contact.

On the other hand, the common contact of the rotary switch LS and the stop contact on the use position side are open, and the normally closed contact side of the door switch relay is open.
Relay MR1 is demagnetized and its normally closed contact side is closed. Therefore, a circuit in which the 7th terminal side of the electric motor 12 serves as an anode is formed, the electric motor 12 rotates toward the standby position, and the feeder arm 6 pivots rearward.

As the electric motor 12 rotates, the rotary switch LS rotates counterclockwise. Then, when the rotary switch LS is rotated to a position where the common contact of the switch and the stop contact on the use position side are closed and the common contact and the stop contact on the standby position side are opened, the coil of the second relay MR2 is demagnetized. Then, the electric motor 12 is stopped.

On the other hand, when the capacitor C2 is charged by the current to the base of the transistor T2, the base potential becomes high and the transistor T2 is automatically turned off. That is, regardless of the contact state of the rotary switch LS, the coil of the second relay MR2 is demagnetized and the electric motor 12 is stopped after a predetermined time defined by the capacity of the capacitor C2 has elapsed.

Next, when the door is closed, the door switch relay DR is demagnetized, and the normally closed contact side of the relay becomes conductive. At this time, in the rotary switch LS, the stop contact on the use position side is closed and the stop contact on the standby position side is opened, so that the transistor T1 becomes conductive and the coil of the first relay MR1 is excited in the same manner as above. Along with this, a circuit in which the 6th terminal side serves as an anode is formed, and the electric motor 12 rotates in the opposite direction to the above. Then, in the same manner as above, the rotary switch LS rotates clockwise,
Alternatively, the electric motor 12 is stopped depending on the charging time of the capacitor C1.

Now, for example, when trying to drive the feeder arm 6 from the position B to the position A in FIG. 1, if the rotation of the feeder arm 6 is obstructed by some obstacle, the driven member 15 The first torsion coil spring 18 between the intermediate member 16 and the intermediate member 16 is wound tightly, the driving force applied to the driven member 15 is absorbed, and as a result, the feeder arm 6 is held in a stopped state. This prevents the drive unit P or the feeder arm 6 from being damaged. Also, since the electric motor 12 automatically stops in a timed manner as described above,
Burnout due to overload does not occur.

On the contrary, when the feeder arm 6 does not move from the position B due to the failure of the electric motor 12, the second torsion coil spring 19 between the intermediate member 16 and the arm connecting member 17 is provided.
If the feeder arm 6 is rotated against the spring force of the
Only when the torsion coil spring 19 is tightened, the feeder arm 6
Rotates to the use position side.

Since the relatively weak spring force acts on the bias toward the standby position, the feeder arm 6 can be easily moved to the use position. Further, since the relatively strong spring force acts on the bias toward the use position, the seat belt wearing state at the use position does not become unstable.

As described above, according to the present invention, the damper unit including the feeder arm, the control unit, and the drive unit are provided.
Since they can be sub-assembled with each other, the parts management and the manufacturing process can be simplified. Further, since the output shaft of the drive unit and the input shaft of the damper unit are arranged in parallel with each other, the drive unit can be mounted on the same plane as the damper unit. Therefore, the degree of freedom in seat design is increased, and a seat that is even more comfortable to sit can be provided. In addition, since the protrusion of the connecting frame member suppresses the tooth jump of the timing belt,
The looseness of the belt prevents the rotation angle of the feeder arm from changing, and moreover, the rotation limit of the intermediate member, which serves as a reference for the position of the torsion coil spring, is defined by the stopper protrusion of the connecting frame member, so that the electric motor is overloaded. Even if it runs, the torsion coil spring is tightly wound and the error is absorbed, so there is no concern that the position of the feeder arm will change.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire front seat to which the device of the present invention is applied, FIG. 2 is an exploded perspective view of the device of the present invention, and FIG. 3 is a sectional view of a damper unit. Yes, the fourth
FIG. 5 is a side view of the device of the present invention as seen from a mounting surface for a seat, FIG. 5 is a perspective view of a main part, and FIG.
FIG. 7 is an outside view of the device of the present invention, and FIG. 7 is a control circuit diagram. P ... Drive unit, C ... Relay circuit unit, D ...
… Damper unit, 1… Belt reacher device, 4…
… Seat belt, 6 …… Feeder arm, 7 …… Seat, 11 …… Reducer, 12 …… Motor, 14 …… Timing belt, 15 …… Driven member, 15a …… Timing pulley, 15b …… Inner diameter sleeve, 15c …… Outer diameter sleeve, 15c
…… Claws, 16 …… Intermediate member, 16a …… Flange part, 16f ……
Radial protrusion, 17 ... Arm connecting member, 17c ... Center hole, 1
8 …… 1st torsion coil spring, 19 …… 2nd torsion coil spring, 20 …… connecting frame member, 20a ・ 20b …… stopper protrusion, 20c …… protrusion, 20d …… extension, 28 …… small timing Pulley, 30 …… Retainer roller, 31 …… Bracket, 33
...... Tension coil spring

Claims (3)

[Claims] 1. An arm for pivotally moving a connecting portion of a seat belt between a standby position behind the front seat and a use position on the front side of a backrest of the front seat, an electric motor and a speed reducer. A belt reacher device having a drive unit for giving rotational force to an arm, and a damper unit for transmitting the drive force of the drive unit to the arm, wherein the damper unit has a drive force of the drive unit. The driven member that is directly transmitted is combined with the driven member so as to be rotatable relative to the driven member in a predetermined angle range, and the driving force toward the use position is transmitted through the first spring means to the standby position. The driving force is directly transmitted to the intermediate member and is rotatably combined with the intermediate member within a predetermined angle range, and the driving force to the standby position is transmitted via the second spring means. The driving force to the use position is directly transmitted to the arm connecting member, and the output shaft of the drive unit and the donburi member are connected with an endless transmission band, and the damper unit and the damper unit are connected to each other. A belt reacher device, wherein the belt reacher device is connected to a drive unit via a connecting frame member that rotatably supports the damper unit. 2. The connecting frame member has a cover-shaped portion which is sandwiched between the driven member and the intermediate member and partially covers an endless transmission band wound around the driven member. The belt reacher device according to claim 1, wherein a protrusion that faces the outer peripheral surface of the endless transmission band is formed on the inner peripheral surface of the cover-shaped portion with a minute gap. 3. The belt reacher device according to claim 2, further comprising stopper means provided between the connecting frame member and the intermediate member for defining a relative rotation limit between the connecting frame member and the intermediate member.