KR20040041796A - Tension reducer for seatbelt of automobile - Google Patents

Abstract

PURPOSE: A tension reducer for a seat belt is provided to reduce components and manufacturing cost by changing the structure of a restraint unit. CONSTITUTION: In a tension reducer for a seat belt, a spring restraint unit is interlocked with a clutch unit, and restrains the elasticity of coil springs(130,150). The spring restraint unit includes a first gear(190) coupled to a protrusion(126) formed at a bush shaft(120), a second gear(192) engaged with the first gear and having a pin guide groove, and a bar-shaped pin(194) inserted into the pin guide groove and fixed to a lever(180).

Description

Tension reducer for seatbelt of automobile

The present invention relates to a tension reducer for a seat belt of an automobile, and more particularly, to stop the winding of the winding shaft on one side of the webbing plate constituting the retractor, to stop the winding of the webbing, and at the same time within a predetermined range. In the tension reducer to relieve the pressure by allowing the webbing to be pulled out by enabling the reverse rotation of the winding shaft, the spring restraining means associated with the clutch means is equipped with a conventional mechanical spring restraining means. By changing the configuration, it is possible to reduce the parts and reduce the cost, and to prevent the problems caused by the electrical wiring, that is, disconnection, short circuit, excessive resistance, etc., and can also be applied to the rear seat. Rather, it is possible to reduce the pulling force of the webbing even before fastening the buckle. For a seat belt of the car it relates to a tension reducer.

In general, the seat belt is emphasized for the driver's safety. When the seat belt is worn, webbing of the belt may squeeze the part of the passenger's chest and reduce comfort. Various types of tension reducers for seat belts are known.

4 is a perspective view showing a tension reducer for a seat belt separately disclosed in Japanese Patent Application Laid-Open No. 5-71067.

The tension reducer for the seat belt stops the rotation of the winding shaft 102 on one side of the webbing plate 100 constituting the retractor, restrains the winding of the webbing 106, and also winds it within a predetermined range. It is possible to reverse the rotation of the shaft 102 so that the webbing 106 can be pulled out to reduce the pressure.

However, the tension reducer for a seat belt according to the related art should be configured with a buckle switch 204 on a buckle (not shown), and a wiring for supplying electrical power to the solenoid 190 is configured.

Therefore, a problem caused by the configuration of the electrical wiring, that is, wire breakage, short circuit, excessive resistance, etc. cause problems in the wiring of the pretensioner, which is widely applied these days, and the application of the structure for installing the wiring in the buckle It is not easy to apply only to the driver's seat and the passenger seat, there is a problem that you feel uncomfortable when fastening because the seat belt is given a continuous force until the actual buckle is fastened.

Accordingly, the present invention has been made to solve the above problems, stops the rotation of the winding shaft on one side of the webbing plate constituting the retractor, while restraining the winding of the webbing, within a predetermined range In the tension reducer which enables the reverse rotation of the winding shaft to take out the webbing to relieve the feeling of pressure, it is equipped with a spring restraining means associated with the clutch means, the configuration of the existing electrical spring restraining means, simple mechanical configuration By changing to, it is possible to reduce parts and reduce costs, and to prevent the problems caused by configuring electrical wiring, that is, disconnection, short circuit, excessive resistance, etc., and can be applied to the rear seat as well. New cars that can reduce the pulling force of the webbing even before the buckle is tightened To provide a tension reducer for a seat belt has its purpose.

1 is a side cross-sectional view showing an assembled state of a tension reducer for a seat belt of a vehicle according to the present invention;

2 is an operation diagram showing an operating state of the second gear according to the present invention;

3 is an operation diagram showing an operating state of the lever according to the present invention,

4 is an exploded perspective view showing a tension reducer for a seat belt of a conventional vehicle.

<Explanation of symbols for the main parts of the drawings>

100: webbing plate 102: winding shaft

104: one end 106: webbing

112: base 120: bush shaft

120a: Shoulder 122: Center Boss

124: locking groove 126: projection

128: bush groove 129: disk

130: first coil spring 130a: outer end

130b: inner end 140: coil spring holder

140a: first spring mounting portion 140b: second spring mounting portion

141: intermediate wall 142: central hall

142a: first boss142b: second boss

143: inner wall 144: first locking groove

146: second locking groove 148: latch

150: second coil spring 150a: outer end

150b: inner end 160: stay shaft

160a: inner extension portion 162: center hole

164: locking groove 170: cover

172: Home 173: Boss

180: lever 181: hinge axis

190: first gear 192: second gear

192a: pin guide groove 192b: central axis

194 Pin 202 Tongue

Hereinafter, the features of the present invention for achieving the above object are as follows.

The present invention is a clutch means that the webbing 106 is rotated by transmitting the rotational force of the first and second coil springs (130,150) to assist the webbing (106) by its own elastic force at the time of withdrawal and retraction and reduce the feeling of pressure. In the tension reducer for a seat belt of an automobile having a structure including a lever means for stopping rotation of the clutch means when the webbing 106 is no longer pulled out,

It is characterized in that it is possible to restrain the elastic force of the spring by using a spring restraining means including two gear combinations that work together in accordance with the pulling in and out of the webbing 106 and the lever 180 interlocked therewith.

In particular, the spring restraining means includes: a first gear 190 engaged with the protrusion 126 of the bush shaft 120 of the clutch means;

It is meshed with the first gear 190, a relatively small circular trajectory is formed at a position close to the central axis 192b, and a large circular trajectory is formed outside thereof, and at the same time, it continues in a predetermined section and has a spiral trajectory. A second gear 192 having a pin guide groove 192a formed therein;

One side is inserted into the pin guide groove 192a, the other side is characterized in that it comprises a pin 194 of the long bar (bar) shape is fixed to the lever 180.

Hereinafter, the configuration of the present invention with reference to the accompanying drawings in detail.

1 is a side cross-sectional view showing an assembled state of a tension reducer for a seat belt of a vehicle according to the present invention, Figure 2 is an operation diagram showing the operating state of the second gear according to the present invention, Figure 3 is the present invention The operation diagram showing the operating state of the lever according to.

As shown in FIG. 1, when the tension reducer for the seat belt according to the present invention is constructed, in the tension reducer for the seat belt which relieves the tension of the seat belt retractor, the webbing 106 itself is removed at the time of withdrawal and recovery. Clutch means actuated by directly converting the elastic force of the first and second coil springs (130,150) to assist the webbing (106) by the elastic force and reduce the feeling of pressure, and the webbing 106 is no longer drawn out A base 112 which is coupled to a lever means for stopping the rotation of the clutch means, and a cover 170 for fixing the clutch means and the lever means in place and accommodating the clutch means so as to be rotatable to fix the clutch means and the lever means. It consists of).

The clutch means is provided with a coil spring holder 140, as shown in Figure 1, the coil spring holder 140 has an intermediate wall 141 is formed, the center hole 142 at the center thereof The perforations are formed, and the first and second bosses 142a and 142b protrude to the axial length to the left and right of the circumference.

First and second spring mounting portions 140a and 140b are integrally formed on both sides of the intermediate wall 141, and the first spring mounting portion 140a is a cylinder having a diameter smaller than that of the second spring mounting portion. The second spring mounting part 140b is formed in a cylindrical shape around the outer circumferential surface of the intermediate wall 141 with a diameter relatively larger than that of the first spring mounting part 140a.

In addition, when the first coil spring 130 is accommodated in a predetermined position of the inner wall 143, the first spring mounting portion 140a is provided with a first locking groove 144 through which the spring outer end 130a is engaged. On the outer circumferential wall surface, a latch 148 composed of a plurality of teeth is formed.

The second spring mounting portion 140b is provided with a second locking groove 146 to engage the outer end portion 150a when the second coil spring 150 is mounted on the inner wall 143.

When the first coil spring 130 is mounted on the coil spring holder 140, the outer end 130a is caught by the first catching groove 144, and the inner end 130b of the bush shaft 120 is described later. It is inserted into the engaging groove 124 formed in the center boss 122 of the.

When the second coil spring 150 is also mounted on the coil spring holder 140, the outer end portion 150a is caught by the second locking groove 146, and the inner end portion 150b is formed on the stay shaft 160. Supported on the groove 164.

The clutch means may include a bush shaft 120 and a stay shaft cooperating to receive the first and second coil springs 130 and 150 in the left and right first and second spring mounting portions 140a and 140b of the coil spring holder 140, respectively. 160 is provided.

The bush shaft 120 is composed of a disk-shaped disk 129, the disk 129 is stepped on one side and has a shoulder (120a), the other side of the center of the coil spring holder 140 The protrusion 126 and the central boss 122 inserted into the hole 142 and protruding are integrally formed.

The central boss 122 has a locking groove 124 into which the inner end 130b of the first coil spring 130 is inserted.

In addition, a bush groove 128 is formed at the center of the bush shaft 120 and one end 104 of the winding shaft 102 is fitted to a predetermined depth of the central boss 122 so that the webbing 106 is pulled out. If so, it cooperates with the winding shaft 102.

That is, a separate winding force is provided for the webbing 106.

The stay shaft 160 forms a center hole 162 having an “H” shaped cross section as the inner extension portion 160a, and the inner end portion 150b of the second coil spring is caught at a predetermined position on the outer surface. A locking groove 164 is formed.

The stay shaft 160 thus formed is mounted onto the protrusion 126 of the bush shaft 120, at which one side is inserted above the second boss 142b of the coil spring holder 140, the other side of which is described later. It is inserted onto the boss 173 of the cover 170. At this time, the protrusion 126 of the bush shaft 120 is coupled to be seated on the end portion groove (172).

In addition, the clutch means is provided with a lever means for controlling the operation.

The lever means is configured to rotate about the hinge shaft 186.

The lever means is located immediately below the coil spring holder 140 such that the tip of the lever 184 is engaged with the latch 148 formed on the outside of the first spring mounting portion 140a during assembly.

In addition, the clutch means is inserted in the cover 170 and fixed in position by the base 112.

Such a configuration has the same configuration as a conventional tension reducer, and the configuration described below has the features according to the present invention.

Here, the bush shaft 120 and the first and second coil springs 20 and 40 and the coil spring holder 32 are arranged in series along the axis CL.

Meanwhile, the first gear 190 is axially fixed between the cover 170 where the bush shaft 120 is axially fixed, and the second gear 192 is formed to engage with the first gear 190. Is formed at regular intervals with the lower lever 180.

A pin guide groove 192a having a spiral trajectory is formed in the second gear 192. The pin guide groove 192a has a relatively small circle trajectory at a position close to the central axis 192b. It is provided with a large circle trajectory to the outside, it is continued in a certain section to form a spiral shape.

On the other hand, a long bar (pin) 194 is inserted into the pin guide groove 192a of the second gear 192 to one side, the other side is fixed to the lever 180.

Next will be described the operation of the seat reducer tension reducer according to the present invention having such a configuration.

First, when the occupant sits on the seat and pulls out the webbing 106, the winding shaft 102 rotates while the webbing 106 is released.

The bush shaft 120 is rotated by the rotation of the winding shaft 102, the first coil spring 130 is wound over the center boss 122 in accordance with the rotation of the bush shaft 120, the first coil At the time when the spring 130 is fully wound, the second coil spring 150 is released to provide a winding force to the winding shaft 102.

When the bush shaft 120 rotates, the first gear 190 connected to the bush shaft 120 also rotates, and the second gear 192 engaged therewith also rotates.

When the second gear 192 rotates, the pin 194 moves along the trajectory of the pin guide groove 192a of the second gear 192.

At this time, while moving along the pin guide groove 192a having a small circle and moving to the pin guide groove 192a having a large circle, the lever 180 is rotated about the hinge shaft 181 while the lever 180 is rotated. The tip is engaged with the latch 148 of the coil spring holder 140 to restrain the rotation of the clutch means.

After the tongue 202 is inserted into the buckle (not shown) in the state where the webbing 106 is drawn out according to the passenger's own body, the coil spring holder 140 is restrained because the second coil spring 150 is restrained. Thus, the webbing 106 is not wound, and only the first coil spring 130 connected to the winding shaft 102 acts to reduce the pressure of the seat belt received by the occupant.

At this time, in the state in which the coil spring holder 140 is restrained by the lever 180, only the first coil spring 130 acts, and the bush shaft 120, the first gear 190 and the second gear 192 is freely rotatable as the trajectory of the pin guide groove 192a of the large circle along the pin 194, the webbing 106 can be loosened and pulled by the trajectory.

Next, when the tongue 202 of the seat belt is pulled out and the webbing 106 is rewound, the pin 194 moves from the large circular pin guide groove 192a to the small circular pin guide groove 192a. In this case, the lever 180 is rotated about the hinge shaft 181 to release the engagement state with the latch 148, thereby receiving the elastic force of the first and second coil springs 130 and 150 so that the webbing ( 106) is wound.

As described above, the tension reducer for seat belts of automobiles according to the present invention can achieve component reduction and cost reduction by changing the configuration of the existing electrical restraining means into a simple mechanical configuration, and the electrical wiring Problems caused by the configuration, namely disconnection, short circuit, excessive resistance, etc. can be prevented at the same time, while not only applicable to the rear seat, but also has the effect of reducing the pulling force of the webbing before fastening the buckle.

Claims (2)

Clutch means that the webbing 106 rotates by transferring the rotational force of the first and second coil springs 130 and 150 to the body rotational force, which assists the webbing 106 and reduces the feeling of pressure by its elastic force at the time of withdrawal and withdrawal; In the tension reducer for a seat belt of an automobile having a structure including a lever means for stopping rotation of the clutch means when the 106 is no longer pulled out, An automobile characterized in that it is possible to restrain the elastic force of the spring by using a spring restraining means including two gear combinations that work together according to the drawing-in and drawing-out operation of the webbing 106 and the lever 180 interlocked therewith. Tension reducer for seat belts. The method of claim 1, wherein the spring restraining means comprises: a first gear (190) coupled with the protrusion (126) of the bush shaft (120) of the clutch means; It is meshed with the first gear 190, a relatively small circular trajectory is formed at a position close to the central axis 192b, and a large circular trajectory is formed outside thereof, and at the same time, it continues in a predetermined section and has a spiral trajectory. A second gear 192 having a pin guide groove 192a formed therein; One side is inserted into the pin guide groove (192a), the other side is a tension reducer for seat belts of the vehicle, characterized in that it comprises a pin 194 of the long bar (shaft) is fixed to the lever (180). .