JPS58122242A - Safety belt winding device - Google Patents

Abstract

PURPOSE:To simplify the operation of a titled device by operating a control circuit only with the rotational output of a pulser and an operational output of a buckle switch. CONSTITUTION:When a crewman is at forwardly inclined posture and the like after a safety belt fitting is finished and a safety belt 3 is pulled out, a motor 7 is rotated idly. When the crewman returns to the previous posture, the belt is wound by a subspring 10, a slack portion existing on the belt 3 is absorbed by the rotation of the motor 7 according to a pulse output generated by a W side pulse processing circuit 14A. When the slack is absorbed thoroughly, W side pulse processing circuit 14A is made OFF, its output is lowered from H to L, accordingly, No.1, No.2 memory circuit 16, 18 is cleared and the motor 7 is locked.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety belt retractor installed in a vehicle or the like.

In conventional winding devices used for vehicle safety belts, an unwinding spring (
A return spring (hereinafter also referred to as a return spring) is attached, and the pulled out belt is wound up by the spring force of this spring.

This kind of return spring is designed so that tension is always applied to the safety belt when the belt is pulled out, so for example, if the driver maintains a normal driving posture after tightening the safety belt, This will give a feeling of pressure. For this reason, a safety belt retractor is required that has a mechanism that temporarily relieves the tension of the safety belt due to the return spring (hereinafter also referred to as reso-use) once the safety belt is fastened and the driving posture is maintained.

The present invention has been made in order to meet the above-mentioned demands,
To provide a safety belt retractor that can maintain the safety belt tension (hereinafter also referred to as tension) in an optimal state at all times according to the driver's driving posture by winding the safety belt mainly by motor drive. The purpose is to

The present invention will be specifically explained below using Examples.

FIG. 1 is a schematic exploded perspective view showing one embodiment of the safety belt retractor of the present invention, and FIG. 2 is an assembled side view of the same. In the figure, reference numeral 1 denotes a frame having a U-shaped cross section and is fixed to the vehicle floor or seat by appropriate means. A shaft 2 is rotatably supported between the side plates IA and IB of the frame 1 through an insertion hole 1C, and one end of the safety belt O is fixed to the shaft 2 so that it can be wound. There is. As a result, the direction of the arrow X becomes the rotational direction when the belt is pulled out, and the reverse direction Y becomes the rotational direction when the belt is taken up. In addition, the shirt l-2 protrudes outward (to the left in the figure) from one side plate 1A, and the protrusion 11:l has a rectangular fitting protrusion at its tip for fixing a shaft drive gear, which will be described later. A groove 2B is provided for fixing the portion 2A to one end of a sub-spring to be described later. Furthermore, an insertion hole 4B is provided diagonally below the side plate 1A, into which a shaft portion of a drive gear to be described later is inserted. In addition, this side plate 1A has an insertion hole for the gift 2, and mounting holes 4C and 4C for attaching the gear holding plate, which will be described later.
is provided.

Reference numeral 5 denotes a gear holding plate, which has a convex cross section and has mounting holes 5C and 5C at both ends, and holes 5A and 5B for holding a reduction gear, which will be described later, in the raised middle part.
is provided. The gear holding plate 5 is attached to the frame side plate 1 through the mounting holes 5C and 5C- at both ends.
It is attached to the attachment holes 4C, 4C of A by appropriate means such as screws. The shaft portion 6A of the drive gear 6 is rotatably inserted into the insertion hole 4B of the frame side plate 1A,
A fixing hole is provided in this shaft portion 6A, and a motor 7 attached to the inner bottom surface of the U-shaped frame 1 is inserted into this fixing hole.
A rotating shaft 7A is inserted and fixed therein. This motor 7 is connected via a lead wire 7B to a control circuit block 1 whose details will be described later.
Connected to 2. A reduction gear mechanism 8 is attached to the gear holding plate 5! are doing. This reduction gear mechanism 8
A first reduction gear 8A that meshes with the teeth 6B of the drive gear B, a second reduction gear 8B coaxially fixed to the first reduction gear 8AK, and a second reduction gear 8B that meshes with the second reduction gear 8B. A sixth reduction gear 8C, a fourth reduction gear 8D coaxially fixed to the third reduction gear 8C, and the first and second reduction gears are rotatably mounted in the mounting hole 5B of the holding plate 5. Take it”
a rotating pin 8E, a rotating pin 8F in which the 6th degree fourth reduction gear is rotatably attached to the mounting hole 5A of the holding plate 5, and both rotating pins 8E.

A groove is formed by connecting plates 1-8G and K, which are rotatably connected to each other. 10 is the insertion hole 4 of the frame side plate 1A
This sub-spring has one end fixed to a groove 9 at the tip of the shaft 2 projecting outward from A, and the other end of this sub-spring 10 is fixed to the inner surface of a spring cover 11 disposed outside of the sub-spring 10. has been done. This spring cover 1
V 1 has a cup shape and is fixed to the side surface of the frame side plate 1A by appropriate means while covering the sub-spring.
, and the tip of the shaft 2 protrudes from an insertion hole 11A formed in the center thereof. A shaft driving gear 9 is fitted into the fitting protrusion 2A at the protruding tip of the shaft 2 through a fitting hole 9A, and this shaft driving gear 9 is connected to the fourth reduction gear 8D of the reduction mechanism 8. It meshes with the Further, a pulser 20 is attached to the tip of the shaft 2 that protrudes outward (to the right in the figure) from the frame side plate 1B.
is fixed. For example, as shown in FIG. 3, this pulser 20 has four electric foil patterns (for example, copper foil) 20B attached to the surface of a disk-shaped substrate (for example, epoxy resin) 2OA that is fixed to the belt winding shaft 2. This copper foil has a circular grounding part 21E on the inner circumference, an intermediate part 21A connected to the circular grounding part 21E and extending radially to the outer circumference, and an outer extension part 21B extending from the intermediate part via a stepped part. ,
For example, contacts E, A, and B fixed to the frame 1 are arranged at positions corresponding to each area (see Figures 2 and 6).Lead wires (not shown) extend from each contact. The tip of the lead wire is connected to the control circuit block 12. This pulser 20 and contacts E, A, and B constitute a shaft rotation direction detection member.

Next, the contents of the control circuit block 12 will be explained with reference to FIG. This control circuit block 12 includes a phase detection circuit 16 that inputs each contact output pulser A and pulser B of the pulser 20 and detects their phase, and a pulser A output and two outputs C and D''e gate of the phase detection circuit 13. and two outputs E each.

Two antgames that generate F) ANI) + , A
NI) 2, the winding side (W) pulse processing circuit 14A, the drawer +011 (D) the pulse processing circuit 14B, the time lag circuit 15 that gives a time lag to the output of the D pulse processing circuit 14B, and the output of this time lag circuit 15. A first memory circuit 16 for storing data, an inverter INI for inverting the output of the D-pulse processing circuit 14B, and a buckle that operates depending on the engagement state between a not-shown tongue and a notch provided at the tip of the safety belt 3. A transition detection circuit 17 that outputs a pulse every time the output signal of the switch SW+ changes.
, a second storage circuit 18 that stores the output of this transition detection circuit 17, and this second storage circuit 18. Said first memory circuit 16. By the output of ORI, which makes each output of the W pulse processing circuit 14A a three-man power, and the AND gate ANT)3, which makes each output of the inverter INI two-man power, and the output of this ant game 1 and ANDa, and a transistor IJIr that is controlled to drive the motor 7. Each of the memory circuits 1621B is cleared at the moment the output of the W-side pulse processing circuit 14A falls from rHJ to rLJK.

The phase detection circuit 1'5 includes, for example, an inverter N2. ■N3 and D type flip-flop FF
It is composed of , and. When the above-mentioned pulser 20 and contacts E, A, and B are in the relationship as shown in FIG. 6, each output A, B, and A as shown in FIG. 7(a) during clockwise (CW) rotation. .

B and Q are obtained and the winding is rotated in 9 directions (Windi rLg
, W), and when rotating in the counterclockwise direction (CCW), an output as shown in FIG. 7(A) is obtained, and rotation in the drawer direction (Dra, wtrJ)) is detected.

As shown in FIG. 8, the transition detection circuit 17 includes, for example, a first exclusive logic game 1-EXORI in which the power supply ycc and the output H of the buckle switch SW1 are powered by two people, and a power supply VC.
A time constant circuit (
A second exclusive logic gate EXO & output J obtained through the resistor & and capacitor CO)
and a third exclusive logic gate EXOR3 that outputs the output of the second exclusive logic gate F2X0& and the output H of the buckle switch SW1), the signal H of the buckle switch SWI changes. Each time, a pulse-like output having a predetermined width T as shown in FIG. 9 is generated.

This predetermined width T can be arbitrarily adjusted depending on how the time constant circuit is set.

Next, the operation of the above-mentioned component will be explained with reference to FIG. 10, which is an explanatory diagram of the operating torque of the control unit 11.

First, when the belt O is pulled out, the motor 7 idles and the sub-spring (sub-SPG) 10 is wound up. The belt pull-out resistance at this time is the load when the motor is idling and the torque when winding the sub-spring 10 (for example, 3 to 4 Ky, vr
a), so if the tension of the subspring 10 is set low, the belt can be easily pulled out (state (1) in Fig. 10). At this time, the pulser 20 moves in the so-called direction ( CW), so the pulsar 8 output is generated first, and then the pulsar B output is generated in a partially wrapped state (the state shown in Fig. 7 (α)), so the control circuit shown in Fig. 4 Since the phase detection circuit 16 in 12 generates an output of C-rHJ, D=rLJ, DIIIU is determined by the pulse output F of the AND gate AND2.
The pulse processing circuit 14B operates and issues an rHJ level output. Since this rHJ level is inverted to rLJ level by the output cover inverter INI, the output G of the AND gate ANDg that controls the transistor Tr1 becomes rLJ level, and this transistor Tr I is turned off, so that the motor 7 is rotationally driven. Instead, it will remain idling.

Next, when the occupant pulls out the safety belt 3 to a desired length and engages the tongs in the buckle (not shown), the buckle switch SWI turns on, and at this moment the transition detection circuit 1
7 generates a pulse-like output as shown in FIG. 9, and this is stored in the second memory circuit 18, so that the memory output (
"H" level) is input to the OR gate OR, and the output of the OR gate OR1 becomes rHJ level. Once the tongue is engaged with the buckle, the occupant removes his/her hand from the safety belt 6 (Mj), causing the safety belt to loosen (slap). At this stage, the belt winding shaft 2
begins to rotate in the belt winding direction, so the pulser ~2 starts rotating in the belt winding direction.
0 also rotates in the belt winding direction and generates pulse outputs as shown at A and H in FIG. 7(b).

As a result, the output of the phase detection circuit 16 is C-rLJ.

When D-rHJ occurs, a pulse-like output E is generated from the AND gate ANDI, and an rHJ level output is generated from the pulse processing circuit 14A.On the other hand, the output of the pulse processing circuit 14B on one side falls to the rLJ level, and this The falling state is stored in the first storage circuit 16 via the time lag circuit 15. At this time, the output of the OR gate OR is rHJ.
level, and the output of inverter INI is r
Since it is at HJ level, the output G of AND gate ANT)3
When the voltage is at rHJ level, the transistor 'l' r1 becomes conductive, so that the motor 7 is driven to rotate. The rotation of the motor 7 quickly absorbs the slap of the safety belt 3 (the state shown in FIG. 10 (2)).

When the slap is absorbed and the safety belt 3 is fitted to the occupant (belt attachment complete state),
The pulse processing circuit 14A is turned off and its output becomes
” and falls to rLJ, so the first and second memory circuits 16
．． 18 is cleared and the gate of the AND gate ANDs is closed, so that the motor drive is stopped (state shown in FIG. 10 (4)). Here, after the safety belt 3 has been pulled out, the torque of the sub-spring 10 and the 7927372 of the safety belt 3 are
Even when the weight is balanced and the belt is not wound, the output of the first memory circuit 16 that stores the state of the D1111 pulse processing circuit 14B is at the rHJ level, so the motor 7 is driven to rotate and the safety belt 3 is is wound up and stored. At this time, sub spring 1 at least
If the belt is wound with zero force, the W-side pulse processing circuit 14A generates an output, so that the belt is wound regardless of the operation of the time lag circuit 15.

When the occupant leans forward after the safety belt has been fitted, the safety belt 6 is pulled out, causing the motor 7 to idle as described above, and when the occupant returns to the original position, the sub-spring is used as the base. The belt is wound up by a force of 10, a pulse output is generated from the Wlil pulse processing circuit 14A, the motor 7 is driven to rotate, and the slug generated in the bell 3 is absorbed. That is, the absorption of the slug is performed with a large torque that is the sum of the respective torques of the sub-spring 10 and the motor 7 (states shown in FIGS. 10 (5) and (6)).

When the slap is sufficiently absorbed, the W11111 pulse processing circuit 14A is turned off, and the output is changed from rI (J to "L").
” to fall on the 1st. The second memory circuits 16, 18 are cleared and the motor is locked.

When the buckle is released to release from the attached state, the transition detection circuit 17 is activated by the output of the buckle switch SWI.
A pulse-like output is generated from the second memory circuit 18, and an rHJ level output is generated from the second memory circuit 18. At this time, the output of the D4a pulse processing circuit 14B is at the rLJ level, so the AND gate ANDs is opened and the motor 7 is driven to rotate. As a result, the safety belt 6 is wound with a large torque. At this time,
If the safety belt 6 gets caught on a seat, etc., press W.
Since the output of the side pulse processing circuit 14A falls to the rLJ level, the drive of the motor 7 is stopped. When the cause of the snagging Q of the safety belt 3 is removed, the safety belt 6 is first wound by the sub-spring 10, so the output of the W side pulse processing circuit 14A becomes rHJ level, the motor 7 rotates, and the belt is tightened as described above. is stored (state in FIG. 10 (7)).

When the safety belt 3 is completely retracted and the belt stops moving, W fit! Since the output of the 1-pulse processing circuit 14A falls from rHJ to rLJ, the drive of the motor 7 is stopped and the belt becomes unused (state f8 in FIG. 10, (9)).

In the above operation explanation, if it takes some time to pull out the safety belt and engage the tongue with the buckle to put on the safety belt (in other words, when the predetermined time has elapsed after the belt has been pulled out), The output of the first memory circuit 16 reaches the r 11 J level, the motor 7 is driven, and the n-belt winding operation is performed. time), the output of this W hook pulse processing circuit 14A becomes rHJ
Since the motor 7 is in an idling state, it has no effect on the subsequent drawing operation.

In the above embodiment, when a slap occurs on the belt while the safety belt is attached, it is absorbed by the sum of the sub spring torque and the rotational torque of the motor. If such a high-torque slap absorption mode causes discomfort to the occupant, the motor rotation signal may be gated using a buckle switch, for example, so that the motor does not rotate when the belt is attached.

According to the present invention described in detail above, when the safety belt is worn, only the weak tension of the sub-spring is applied to the Mirabelt, so the occupant can drive comfortably without feeling any pressure from the belt. Furthermore, since the safety belt can be wound up mainly by the motor, the operation can be made faster and the safety belt can be easily operated. Further, since the control circuit is operated only by the rotating blade of the pulser and the operating output of the buckle switch, the circuit configuration is simple, and since the operation is simple, the circuit design is also easy. Furthermore, since the motor utilizes only the idling state and the normal rotation state, a low-cost product can be used, and the cost of the apparatus as a whole can be reduced.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing one embodiment of the device of the present invention;
3 is a front view of the pulsar used in the same embodiment, FIG. 4 is a block diagram showing an example of the control circuit in the same embodiment, and FIG. 5 is an assembled side view of the same main part. Figure 6 is an explanatory diagram showing the relationship between the pulsar and the contact points, Figure 7 (α),
(h) is a time chart for explaining the operation of the phase detection circuit; FIG. 8 is a circuit diagram showing an example of a transition detection circuit used in the control circuit; FIG. 9 is a time chart for explaining the operation; FIG. 10 shows the operating torque for explaining the operation of the embodiment device. 1... U-shaped frame, IA, IB... side plate, 2.
... Shaft, 6... Safety belt, 7... Motor, 8... Reduction mechanism, 10... Sub-spring, 12... Control circuit block, 16... Phase detection circuit, 14A, 14B ...Pulse processing circuit,
15... Time lag circuit, 16.18... Memory circuit, 17... Transition detection circuit M, 20... Pulser, SW,... Buckle switch. αη =22 Fig. 5 IN3 Fig. 6 Fig. 7 (a) (b) Fig. 8

Claims (1)

[Claims] A safety belt, one end of which is fixed to a belt winding shaft interposed between both side plates of the U-shaped frame, is stored so that it can be pulled out and wound up, and the pulled out safety belt is engaged with a buckle and a tongue. A safety belt winding device that is used by being attached to a vehicle includes a motor attached to the side plate of the frame, a deceleration mechanism that decelerates the rotation of the motor and transmits the rotation to the belt winding shaft, and the belt winding device. a sub-spring that applies a relatively weak winding force to the belt winding shaft; and a shaft rotation direction detection member that detects the rotation of the belt winding shaft in the belt pull-out direction and the belt winding direction and generates different signals respectively. a buckle switch means for detecting a state of engagement between the buckle and the tongue and generating a signal each time the state changes; and a control circuit that performs control such that the motor is rotationally driven, and when a belt pull-out direction rotation signal is output from the shaft rotation direction detecting member, the rotation of the motor is stopped and the motor is allowed to idle. Safety belt retractor.