JPH051633U - Safety belt retractor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a safety belt retractor that does not cause pressure on the occupant when the belt is worn, compensates for insufficient webbing retracting force, and causes less slack. . [Structure] A shaft 5 having an eccentric portion 5a is fixed to an end portion of a winding shaft 2, and an external gear 6 having a central hole 6a with which the eccentric portion 5a engages is fixed so as to be swingable. Through hole 7
An internal gear 7 having a and meshing with the external gear 6 is provided, and a central end portion of the sub-winding spring 10 is fixed to a shaft protrusion 8 of the internal gear 7, and an outer peripheral end portion of the sub-winding spring 10 is fixed to The shaft 5 is fixed to the latch gear 11 passing through it, and the main winding spring 13 is attached to the shaft 5.
Of the main winding spring 13 is fixed to the case 4, and stoppers 17 and 18 respectively facing the latch gear 11 and the internal gear 7 in the rotational direction are formed, Also, the arm 2 that can be engaged with and disengaged from the latch gear 11
An electrical actuator 22 with a zero was electrically connected to the buckle switch.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a safety belt retractor for vehicles such as automobiles.

[0002]

[Prior Art]

 In general, the safety belt retractor stops the feeding of the webbing and restrains the occupant to the seat when the webbing sensor or the vehicle sensor detects an excessive acceleration of the vehicle. In this safety belt winding device, one end of a winding shaft pivotally supported by the retractor and a spring case fixed to the side wall of the retractor are provided with winding springs composed of a spiral spring whose center and outer peripheral ends are fixed, The webbing is pulled out by tightening the take-up spring by pulling out the webbing. Therefore, the force of the take-up spring is set on condition that the webbing is completely taken up, and the webbing is urged to rotate by the take-up spring so that the webbing is always taken up by the reel. Occasionally, the occupant feels pressure and may dislike wearing it.

[0003]

[Problems to be solved by the device]

 However, according to the above-mentioned conventional example, since the force of the winding spring is set so as not to generate a feeling of pressure on the occupant, the winding force of the webbing is always insufficient and slack may occur. When slack occurs, the occupant moves forward in the event of a vehicle collision and the seat restraint performance deteriorates.

In view of this, the present invention provides a safety belt winding device that does not cause the occupant to feel pressure when wearing the belt and compensates for the lack of the winding force of the webbing and reduces slack. With the goal.

[0005]

[Means for Solving the Problems]

 In the safety belt winding device according to the present invention, a shaft having an eccentric portion is fixed to the end of the winding shaft, and an external gear or an internal gear having a central hole with which the eccentric portion engages is fixed so as to be swingable. An external gear or an internal gear or an external gear that meshes with the external gear or an internal gear is provided with a central hole through which the shaft penetrates, and the central end portion of the auxiliary winding spring is fixed to the axial center of the internal gear or the external gear. The outer peripheral end of the take-up spring is fixed to the latch gear through which the shaft passes, the central end of the main take-up spring is fixed to the shaft, and the outer peripheral end of the main take-up spring is fixed to the case. , The latch gear and the internal gear or the external gear adjacent to the latch gear are respectively formed with stoppers which face each other in the rotational direction, and the latch gear and the electrical actuator having an arm capable of being engaged and disengaged are electrically connected to the buckle switch. It is characterized by being done.

[0006]

[Action]

 When the occupant pulls out and wears the webbing, and the buckle switch is turned on, the electric actuator operates and the arm engages with the latch gear to prevent its one-way rotation.When the webbing is subsequently released, the internal gear or the external gear is released. The gear stopper rotates away from the latch gear stopper, compressing the auxiliary winding spring and reducing the winding force of the main winding spring.

When the buckle switch is turned off, the electric actuator operates to move the arm away from the latch gear, and the latch gear becomes rotatable. Therefore, the stoppers of the internal gear or the external gear and the latch gear abut each other, and Use force to wind up the entire webbing.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 is a sectional side view, and FIGS. 2 and 3 are sectional front views. The retractor body 1 has a U-shaped cross section, and rotatably supports a take-up shaft 2 between both side walls of the retractor body 1, and one end of a webbing 30 is fixed to the take-up shaft 2 to wind the remainder. (Not shown) is rotatably supported integrally. A case lid 4 is fixed to the side wall 3 of the retractor body 2, and a shaft 5 having an eccentric portion 5a at the end of the winding shaft 2 protruding from the hole 3a formed in the side wall 3 and the case lid 4 is provided. It is fixed so that it can rotate integrally. An external gear 6 having a central hole 6a with which the shaft 5 engages and an internal gear 7 having a central hole 7a meshed with each other are rotatably provided. The outer gear 6 is formed on the outer peripheral edge, the inner gear 7 is formed on the inner peripheral surface, and teeth are formed in the circumferential direction.

As shown in FIGS. 2 and 3, the external gear 6 has a protruding portion 6 b which is inserted into an elongated hole 4 b formed in the case lid 4. The external gear 6 and the internal gear 7 are meshed with each other with a difference in the number of teeth of one tooth, and the internal gear 7 is a so-called Taumel mechanism (reduction mechanism) capable of eccentric rotation in the external gear 6. Since the projection 6b of the external gear 6 is engaged with the elongated hole 4a, the external gear 6 only swings and does not rotate. Then, as shown in FIG. 4, the central end portion of the auxiliary winding spring 10 is engaged with the locking portion 9 formed on the shaft projection 8 of the external gear 6. Further, a latch gear 11 having a central hole 11a through which the shaft 5 penetrates is provided, and an outer peripheral end portion of the auxiliary winding spring 10 is locked to a locking portion 12 formed on the outer peripheral edge thereof. A locking portion 14 with which the central end portion of the main winding spring 13 is engaged is formed on the shaft 5 passing through the latch gear 11. The outer peripheral end of the main take-up spring 13 engages with a locking portion 16 formed on the case 15. Stoppers 17 and 18 are formed to face the ratchet gear 11 and the internal gear 7, respectively, and a spring 28 is mounted between the stoppers 17 and 18 as shown in FIG. The relationship between the external gear 6 and the internal gear 7 may be reversed.

The latch gear 11 has latches 19 formed on its outer peripheral edge at regular intervals. An L-shaped arm 20 that engages and disengages with the latch 19 is loosely fitted to a shaft 21 that is provided so as to project from the case 15. The arm 20 is connected to an actuating piece 23 of an electric actuator 22 such as a solenoid via a hole 24 and a pin 25. The actuator 22 is electrically connected to a buckle switch (not shown) by a wire 27. When the buckle switch is turned on, that is, when the occupant wears a seat belt, the actuator 22 operates. The operating piece 23, which is always protruding, is pulled in, the arm 20 is engaged with the latch 19, and the rotation of the latch gear 11 can be prevented. The arm 20 and the shaft 21 are formed by forming a large diameter hole in the former and inserting the small diameter shaft 21 into the hole, and the shaft 21 is sprinkled so as to come into sliding contact with one side of the hole. One end of the groove 26 is in contact with and biased.

The operation of the above embodiment will now be described. When the webbing 30 is pulled out, the shaft 5 rotates clockwise and the external gear 6 swings, so that the internal gear 7, the auxiliary winding spring 10 and the latch gear 11 move in the same direction. The main winding spring 13 is compressed. If the weaving 30 is released in this state, the main winding spring 13 is unwound and spreads, the shaft 5 rotates left and the external gear 6 swings, and the internal gear 7 and the auxiliary winding spring 10 and The webbing 30 is wound by the latch gear 11 rotating in the same direction.

When the occupant wears the pulled-out webbing 30 and the buckle switch is turned on, the electric actuator 22 pulls the operating piece 23. Therefore, the arm 20 meshes with the latch 19 and the rotation of the latch gear 11 is blocked. When the webbing 30 is mounted and then the webbing 30 is released, the main take-up spring 13 unwinds and spreads, the shaft 5 rotates counterclockwise, the external gear 6 swings, and the internal gear 7 rotates clockwise. When the stopper 18 of the gear 7 is separated from the stopper 17 of the latch gear 11, the auxiliary winding spring 10 is compressed and the winding force of the main winding spring 13 is reduced.

If the buckle switch is turned off in this state, the actuating piece 23 of the electric actuator 22 projects outward, so that the arm 20 rotates counterclockwise and the engagement with the latch 19 is released. As a result, the latch gear 11 rotates counterclockwise, its stopper 17 collides with the stopper 18 of the internal gear 7, the main winding spring 13 unwinds and spreads, and at the same time the shaft 5 rotates counterclockwise and the external gear 6 swings. Then, the internal gear 7, the auxiliary winding spring 10 and the latch gear 11 rotate in the same direction to increase the winding force, and the entire amount of the webbing 30 is wound.

When the webbing 30 is further attached and pulled out, the shaft 5 rotates clockwise, the sub-winding spring 10 unwinds and expands, the pulling force decreases, and the internal gear 7 rotates counterclockwise. The stopper 18 approaches the stopper 17 of the latch gear 11 and collides with it, the latch gear 11 rotates to the right, and the arm 20 moves over the latch 19 and rotates to be displaced. Then, when the webbing 30 is released, the main winding spring 13 unwinds and expands, the shaft 5 rotates counterclockwise, the external gear 6 swings, the internal gear 7 rotates clockwise, and the stopper 18 rotates the stopper 17 of the latch gear 11. The auxiliary winding spring 10 is compressed, and the winding force of the main winding spring 13 is reduced.

[0015]

[Effect of the device]

 According to the invention described above, the winding force of the main winding spring is reduced when the belt is worn, so that it does not give a feeling of pressure to the occupant and is reduced when the belt is released. The webbing can be completely wound up by the force of the main winding spring without. Moreover, since the so-called Taumel mechanism is used, the amount of spring return is small and sliding noise is reduced.

[Brief description of drawings]

FIG. 1 is a sectional side view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA except the case of FIG.

3 is a cross-sectional view taken along the line BB of FIG. 1 excluding the case.

FIG. 4 is a partial cross-sectional side view showing an exploded main part.

FIG. 5 is a cross-sectional view showing the relationship between the external gear and the stopper of the latch gear.

[Explanation of symbols]

2 ... Winding shaft, 5 ... Shaft, 6 ... Internal gear, 7 ... External gear, 10 ...
Sub winding spring, 11 ... Latch gear, 13 ... Main winding spring, 1
7, 18 ... Stopper, 19 ... Latch, 20 ... Arm,
22 ... Electric actuator, 30 ... Webbing

Claims (1)

Claims for utility model registration 1. A shaft having an eccentric portion is fixed to an end of a winding shaft, and an external gear or an internal gear having a central hole with which the eccentric portion engages is swingable. The inner gear or the outer gear that is fixed and has a central hole through which the shaft penetrates is provided, and the inner gear or the outer gear that meshes with the outer gear or the inner gear is fixed, and the central end portion of the auxiliary winding spring is fixed to the axial center portion thereof. An outer peripheral end of the auxiliary winding spring is fixed to a latch gear through which the shaft passes, a central end of the main winding spring is fixed to the shaft, and an outer peripheral end of the main winding spring is fixed to a case. And a latch gear and an internal gear or an external gear adjacent to the latch gear, respectively, to form stoppers that face each other in the rotational direction, and electrically connect the latch gear and an electric actuator equipped with an engageable / disengageable arm to the buckle switch. A safety belt retractor characterized in that