KR820001043B1 - Safety belt retractor with emergency locking mechanism - Google Patents

Abstract

The safety belt retractor comprises a rotary member (20) which is separate from a take-up shaft (9) of theretractor but coaxially with it. This performs a relative movement with respect to the shaft when the acceleration or deceleration of the vehicle reaches a predetermined value. A latch is articulated on the rotary member and an engaging member comes into engagement with it to displace the latch member in a direction away from the center of shaft. A locking device comes into engagement with the latch member (23, 24) when it is displaced to arrest the rotation of the take-up shaft.

Description

Seat belt winding device with emergency locking mechanism

1 is an exploded view of one embodiment of the present invention.

2 is a central cross-sectional view of one embodiment of the present invention.

3 to 6 are principal side explanatory diagrams showing the operation procedure of this embodiment.

7 is a schematic exploded perspective view of a second embodiment of the present invention.

Fig. 8 is a partially cut away partial sectional side view of the above-described two embodiments showing a normal withdrawal or winding state.

FIG. 9 is the same view as in FIG. 8 showing when a certain acceleration of the vehicle is detected with a pendulum to lock the drawing.

FIG. 10 is a diagram showing when the rotational speed of the winding means is detected by centrifugal force to lock the drawing out.

11 is a side view showing the cover of the third embodiment of the present invention with the cover removed.

Fig. 12 is a front view showing the third embodiment partially cut away in the axial direction.

13 is an exploded perspective view of only the main parts of the third embodiment;

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a seat belt winding device for a passenger car, in particular a seat belt winding device having an emergency braking mechanism for restraining a passenger when the vehicle moves at a speed change greater than a predetermined value.

A number of safety belt winding devices with this type of emergency braking mechanism have been proposed so far, but in order to ensure a good and accurate emergency braking, all of the mechanisms require complicated parts, expensive parts, and many parts scores. .

In addition, the conventional emergency braking mechanism detects the acceleration and deceleration of a passenger car through the withdrawal acceleration of the webing to operate the braking mechanism (e.g. USP 3,489,799), and directly detects the acceleration of the passenger vehicle by a pendulum. Two types of actuating instruments (eg USP 3,758,044) have been proposed and are actually used. In order to brake the seat belt winding device more reliably, these two types are actually used as a combination (USP 4,083,511) .But two complex mechanisms must be incorporated to increase the overall size of the device and the number of parts. It is expensive.

It is therefore an object of the present invention to provide a seat belt winding device which is a simple mechanism but operates reliably.

In addition, the present invention comprises a so-called dual type emergency braking mechanism having an emergency braking mechanism operated by webbing pull-out acceleration detection and an emergency braking mechanism operated by acceleration detection of a passenger object having a common component. It is an object of the present invention to provide a seat belt winding device that can be used.

The seat belt winding apparatus of the present invention for achieving the above object is separate from the winding shaft of the seat belt winding apparatus or is installed at the same center as the winding shaft and rotates integrally with the winding shaft, but at a predetermined acceleration rate of the vehicle. A rotating member having a relative movement relative to the winding shaft, at least one latch member supported by the shaft on the rotating member, and installed on the winding shaft to engage with the latch member when at least the rotating member is brought into relative motion with the winding shaft. (Iii) engaging members for moving the latch member in a direction away from the shaft center, and braking means for engaging with the latch member to stop the rotation of the take-up shaft when the latch member moves in a direction away from the shaft center. have.

Another aspect of the present invention for achieving the above object has a means for detecting a predetermined acceleration of the vehicle, and the winding means in the seat belt winding device to brake the webbing take-up means at the time of detection A separate member, which is installed at the same center as the winding means and which rotates together with the winding means in a normal state, stop means for stopping rotation of the rotating member in association with the detection means at a predetermined acceleration of the vehicle, the rotation A support member integrally attached to the winding-up means in parallel with the member, the latch means being provided on the support member to take a braking position and a non-braking position, and typically including at least one latch member in a non-braking position; Is installed on the rotating member, and when the rotating member stops and becomes a relative motion with the take-up shaft, the latch member moves to the braking position. Engaged with the engaging member, wherein the guide latch member to the braking position to allow the seat belt to the retractor with an emergency brake mechanism, which is characterized by being a braking means for stopping the rotation of the take-up means.

Next, a first preferred embodiment of the present invention will be described with reference to FIGS.

In the drawing, side plates 2, 3 parallel to each other are integrally formed in the main body 1 of the seat belt winding device, and holes are formed facing the central portions of those side plates 2, 3, respectively. The winding shaft 9 for the webbing 8 is rotatably supported through the bearing plate 4 and the bush 5 inside. Although the winding shaft 9 is conventional, it is preferable that the winding shaft 9 has the cylinder member 10 formed as a metallic strength member, and the shaft member 11 of the synthetic resin material as a main component in this embodiment.

The cylinder member 10 is provided with a webbing insertion slot 10a in the longitudinal direction, and at the right end, four cutouts 10b are arranged at a right angle of 90 degrees, and at the left end thereof, two facing parts 10b are provided. Large cutout portions 10c are formed. On the other hand, the shaft member 11 has a rod portion 11a extending through the cylinder member and has an enlarged portion 11b of an outer diameter suitable for the inner diameter of the cylinder member 10 near the right end thereof. On the main surface of this enlarged portion, four projections 11c fitted to each of the cutout portions 10b of the cylinder member are formed. Further, the shaft member 11 forms a flat portion 11d at the left end, and the flat member 11d has a support member 13 having an inner hole 13a of a shape fitted thereto. ) Is installed to be embedded.

The support member 13 is fitted to the left end cutout 10c of the cylinder member 10, and thus the winding shaft 9 as an assembly of the cylinder member 10, the shaft member 11 and the support member 13. Is formed. The inner end of the webbing 8 is folded and woven in two layers to be inserted into the cylinder member from the axial slot of the cylinder member 10, and the shaft member 11 penetrates the folded end so that the webbing 8 is wound around the winding shaft ( 9). This configuration of the winding shaft 9 greatly simplifies the manufacturing process and further ensures strength by the cylinder member 10.

The inner end of the take-up spring 15 is fixed to the right end extension 11e of the take-up shaft 9, and the outer end of the take-up spring 15 is attached to a spring cover 16 provided on the basin side wall 3. It is fixed by walking, and the winding shaft 9 is urged in the webbing winding direction in this way.

Next, an emergency braking mechanism which is the main part of the present invention will be described.

The shaft member 11 of the take-up shaft 9 extends outward from the bearing plate 4 provided on the side plate 2, and the rotating member 20 is further rotated with respect to this shaft member. 9 is inserted close to the supporting member 13, and the retaining pin 21 is fitted to the shaft member 11 from the outer side in the axial direction to hold the rotating member 20. As shown in FIG.

On the axially inner side of the rotating member 20, the two latch members 23, 24 face the shaft center so as to face the planar portion of the support member 13 so that the bearing pins 25, 26 Is supported by the shaft.

Spring length pins 27 and 28 are provided at the front end portions of the latch members 23 and 24, and these spring hanger pins 27 and 28 are formed so as to face the shaft to the rotating member 20. It protrudes on the opposite side to the rotating member 20 from the two slots 29a and 29b. Tension springs 31 and 32 are disposed between the bearing pin 25 and the spring hanging pin 28 and between the bearing pin 26 and the spring hanging pin 27. The latch members 23 and 24 are at radially inner shaft positions engaged with the support member 13 of the normal winding shaft 9.

Due to this arrangement relationship between the latch members 23 and 24 and the take-up shaft 9 side, the rotating member 20 rotates together with the take-up shaft 9 in either the webbing pull-out direction or the take-up direction. According to the embodiment described later, when the rotating member 20 relatively rotates with respect to the rotation in the webbing pull-out direction of the winding shaft 9, that is, when the rotating member 20 rotates slowly or stops rotating, the latch member 23, 24 are pushed by the support member 13, and rotate clockwise in the range limited to the slots 29a and 29b about the axial point.

In the present embodiment, two latch members are provided, but one or three or more latch members may be provided, and the springs 31 and 32 are not limited to the above examples. In other words, the latch members are radially inward. It is good to be taxable.

Braking means 30 is provided on the radially outer side of the latch members 23 and 24.

The braking means 30 is a ratchet internal gear 30a provided in the basin side plate 2 of the winding apparatus in the present embodiment and is semi-outward with the latch members 23 and 24 described above. When rotated outward, the latch members 23 and 24 are engaged with the ratchet internal gear 30a.

Therefore, the rotation of the webbing pull-out direction of the take-up shaft 9 is braked, but the rotation of the take-up direction is free since the teeth of the ratchet tooth 30a are avoided.

The braking means 30 is not limited to that shown.

For example, the ratchet inner gear 30a is attached to the basin side plate 2 so as to be able to rotate within a certain angle range, and the ratchet inner gear is mounted on the winding shaft by turning over the braking member attached to the bass side plate by the rotation of the ratchet end gear. The winding shaft may be braked by engaging the ratchet gear.

When the rotating member 20 and the latch members 23 and 24 are formed as appropriate inertial means, and the webbing is drawn out above a predetermined acceleration corresponding to the predetermined deceleration of the vehicle, the rotating member 20 has its own inertia. When the motor is rotated later in the take-up shaft, it becomes a so-called webbing acceleration sensing type emergency braking mechanism.

A ratchet gear is formed on the rotating member 20 so that the latch member acting by the predetermined acceleration sensing means of the vehicle is engaged with the ratchet gear to rotate the rotating member 20 relative to the take-up shaft 9. Acceleration sensing emergency braking mechanism.

It is needless to say that the webbing acceleration detection type and the vehicle acceleration detection type can be used as an alternative or a dual type with both.

In the present embodiment, the support plate 35 is provided below the basal side plate 2, and the pendulum member 36 for detecting the predetermined acceleration / deceleration of the vehicle is suspended to the support plate. The swinging latch member 38 is supported by the support plate 35 in an axially swingable manner. A downward projection 38a is formed below the end of the swinging latch member 38 and is mounted on the dish-shaped enlarged portion 36a formed on the upper end of the pendulum member 36.

When the pendulum member 36 detects a predetermined deceleration of the vehicle and inclines the predetermined amount, the latch member 38 is rotated in the counterclockwise direction (FIG. 1) by the dish-shaped enlarged portion 36a, and the rotating member ( Engage in the ratchet gear of 20) to stop the rotation in the webbing pull-out direction.

Therefore, the latch members 23 and 24 are rotated in the clockwise direction as described above by the support member 13 to engage the ratchet internal teeth of the braking means to brake the rotation of the winding shaft in the webbing pull-out direction.

In addition, although the pendulum-type inertial member is exemplified in the present embodiment as the vehicle acceleration detecting means, it is a matter of course that the inertial member may be made to fall when receiving a predetermined type of inertial member or a predetermined acceleration.

Next, a preferred embodiment of the present invention will be described with reference to FIGS. 7 to 10.

In FIG. 7, the main body 101 of the seat belt winding device is integrally formed with the side plates 102 and 103 parallel to each other, and is formed to face almost the central portions of the side plates 102 and 103. The winding means for the webbing 108 is rotatably supported by sandwiching the bushes 105 and 106 in the holes. The winding means is conventional, and in this embodiment, the winding means preferably includes a cylinder member 110 formed as a metallic strength member and a shaft member 111 made of synthetic resin as main components.

The cylinder member 110 has a webbing insertion slot (110a) is dug in the longitudinal direction, and at the right end thereof there is an opposite cutout (110b) and the left end forms two large cutouts (110c) facing each other. It has a pair of axial protrusions 110d and 110e.

On the other hand, the shaft member 111 is a rod member extending through the cylinder member 110, and two projections 111c coupled to each of the opposing cutouts 110b of the cylinder member 110 near the right end thereof. And (111d).

In addition, the shaft member 111 is formed as a cantilever (cantilever) type as the free end, and the inner end of the webbing 108 is double-folded in two layers to form an axial slot 110a of the cylinder member 110. The shaft member 111 is inserted into the cylinder member from the cylinder member, and the webbing 108 is fixed to the winding means through the shaft member 111.

When the winding means is configured in this way, the manufacturing process is greatly simplified, and furthermore, the strength is sufficiently ensured by the cylinder member 110.

The inner end of the winding spring 115 is caught by the right end extension 111e of the shaft member 111, and the outer end of the winding spring 115 is caught by the spring cover 116 set on the basal side wall 103. The winding means are biased in the direction of webbing winding.

Next, the emergency braking mechanism that is the main part of the present invention will be described.

The left end of the cylinder member 110 of the winding means extends outward from the side plate 102, and the support member 120 is provided therein.

In the present embodiment, the curved slots 120a and 120b are formed in the support member 120, and the axial protrusions 110d and 110e of the cylinder member 110 are formed therein. The support member 120 is installed in the cylinder member 110 by inserting the respective members.

The support member 120 has a pair of cutout portions 120e and 120f formed between the outer circumference portions 120c and 120d and their outer circumferences facing each other in a right angle direction.

The continued portions of the outer peripheral portions 120c and 120d of the cutout portions 120e and 120f are formed as recess portions 120g and 120h, and the latch members 121 and 122 are theirs. The main part is rotatably supported. Holes 123 and 124 are formed in the supporting member 120, and leaf springs 125 and end portions 125a and 126a of 126 are inserted therein, and the branch portions ( 125b) and 126b surround the outer periphery, and these leaf springs 125 and 126 are provided in the support member 120. As shown in FIG. Of course, the leaf springs 125 and 126 may be provided to the support member 120 by another method. The spring portions 125c and 126c of the support member 120 contact the latch members 121 and 122 from the inside, respectively, and bias the latch members outward.

On the outside of the support member 120, the latch members 121, and 122, a braking means 128 having a ratchet internal gear 127 is latched to the side plate 102 by a pin 129.

The pitch diameter of the ratchet internal gear 127 is larger than the diameter of the support member 120, and the latch members 121 and 122 are supported by the bias of the leaf springs 125 and 126. When the latch member is in its inner position, that is, in a non-braking position, the latch member is not engaged with the ratchet internal gear, but the outer position due to the bias of the leaf springs 125 and 126, i. In the position, it engages with the ratchet internal gear 127 of the braking means 128, so that rotation of the winding means in the webbing pull-out direction can be braked.

On the left side of the support member 120, a ratchet plate 130 is supported by a rotational material with respect to the shaft 132 of the pressing member 131 in parallel with the support member through the center hole 130a.

The shaft 132 of the pressing member 131 is fitted into the left end cutout 110c of the cylinder member 110 of the winding means, and the pressing member is placed in the cylinder member 110.

Therefore, the pressing member 131 rotates together with the cylinder member 110.

Two slots 130b and 130c are formed in the ratchet plate 130 in the circumferential direction, and the pins 131b and (13) provided in the pressing member 131 in the slots 130b and 130c thereof are formed. 131c) respectively protrude.

The rotation of the winding means is transmitted to the ratchet plate 130 by this pin slot coupling. On the support member 120 side of the ratchet plate 130, projections 135 and 136 are provided in the radially opposite direction, and these projections have radii on the latch members 121 and 122 during normal webbing extraction. The latch members 121 and 122 are held in the non-braking position described above while being supported by the bias of the leaf springs 125 and 126 by engaging from the outside in the direction. A coil spring 134 is sandwiched between the ratchet plate 130 and the support member 120 or the cylinder portion 36, that is, between the ratchet plate 130 and the winding means, and the ratchet plate 130 is shown in FIG. It is clockwise. The ratchet plate 130 takes the first position whereby the projections 135 and 136 normally engage the latch members 121 and 122 and hold this latch member in the non-braking position described above due to this bias. .

At this time, the latch members 121 and 122, on the contrary, prevent the ratchet plate 130 from rotating further by engagement with the projections 135 and 136. When the winding means rotates in the webbing take-up direction, the ratchet plate is engaged by pin slot engagement between the pins 131b and 131c of the pressing member 131 and the slots 130b and 130c of the ratchet plate 130. 130 also rotates in the same direction, but at this time, the projections 135 and 136 hold the latch members 121 and 122 in the non-braking position described above due to the bias of the coil spring 134. Therefore, in the normal state, the protrusions 135 and 136 can wind up and take out the webbing while holding the latch members 121 and 122 in the non-braking position. However, when only the ratchet plate 130 is stopped while the winding means, and thus the ratchet plate 130 is integrally rotated in the webbing pull-out direction, the winding means including the support member 120 continues to rotate. The plate 130 is delayed relative to the rotation of the support member 120, the latch members 121, 122 are released from the projections 135, 136 of the plate springs 125, 126 The biasing force opens outwardly to the above-described braking position and engages the ratchet brace gear 127 of the braking member 128 to brake the winding means.

In order to stop the ratchet plate 130, the acceleration may be performed by detecting a predetermined acceleration of the vehicle, or may be performed by detecting the take-out speed of the webbing or the extraction angle acceleration. It is good to use both together better.

In the present embodiment, the support plate 137 is provided below the basal side plate 102, and the pendulum member 137a for detecting the predetermined acceleration of the vehicle is slidably suspended from the support plate.

The swinging latch member 138 is supported on the support plate 137 by an axis to allow swinging. A downward projection 138a is formed below the end of the swinging latch member 138, and is mounted on the dish-shaped enlarged portion 137b formed at the upper end of the pendulum member 137a.

When the pendulum member 137a detects a predetermined deceleration of the vehicle and inclines the predetermined amount, the latch member 138 is rotated counterclockwise (Fig. 7) by the dish-shaped enlarged portion 137b, and the ratchet plate Engage with the ratchet gear of 130 to stop rotation in the webbing pull-out direction.

Therefore, the latch members 121 and 122 engage with the ratchet internal gears of the braking means as described above to brake the rotation of the winding shaft in the webbing pull-out direction.

In addition, although the pendulum-type inertial member is exemplified in this embodiment as the vehicle acceleration sensing means, it is a matter of course that the inertial member may be used as the inertial member when receiving a predetermined acceleration or a bowl type inertial member.

In the present embodiment, the ratchet plate 130 is supported on the shaft by pins 142 and 143 such that the centrifugal force detecting levers 140 and 141 face the shaft.

The centrifugal force detecting levers 140 and 141 are the same, and tension springs 145 and 146 are sandwiched between the other end thereof and the axial pins 143 and 142 of the opposite lever. The centrifugal force detecting lever rotates around the bearing pins 142 and 143 by the centrifugal force acting on itself when the winding means rotates in the webbing pull-out direction.

On the other hand, the swing latch member 138 described above has the rear extension portion 138b integrally, and the pin 138c provided at the end of the rear extension portion 138b has a small centrifugal force detection lever 140, 141. Only the fixed amount protrudes in the rotational trajectory when it is rotated by centrifugal force, and when it comes into contact with the centrifugal force detection lever, the swing latch member 138 is rotated counterclockwise so as to be the ratchet plate 130 as in the case of the pendulum member described above. The rotation of the is stopped.

Next, a third embodiment of the present invention will be described with reference to FIGS. Incidentally, the third embodiment will be described focusing on the parts that differ from the second embodiment.

In the third embodiment, the support members 220 provided on the cylinder member of the winding-up means include leaf springs 325 and 326 for biasing the latch members 221 and 222 for braking. The support pieces 325a and 326a which were attached by this are provided.

The support pieces 325a and 326a are formed with recesses 325b and 326b which overlap with recesses 220g and 220h which form part of cutouts 220e and 220f of the support member 220. The recessed parts 220g, 325b, 220h, and 326b are provided with latch members 221, 222 with the recessed part as the center of rotation.

In the third embodiment, the leaf springs 325, 326 abut against the latch members 221, 222 from the outside, unlike the case of the second embodiment, the latch members 221, 222. Is biased inward into a non-braking position.

Further, in the third embodiment, the projections 335 and 336 of the ratchet plate 230 abut against the latch members 221 and 222 from the inside, and are formed by the leaf springs 325 and 326. Normally, the ratchet plate 230 is integrally formed with respect to the support member 220 so as to be fitted to the edge of the support member 220. The pressing member 331 is formed as a cover provided on the base side plate and has an inwardly axial protrusion 332 for supporting the ratchet plate 230 with a rotating material.

With this arrangement, in the third embodiment, the projections 335 toward the support members 220, the latch members 221, 222, and the ratchet plate 230 when the normal forward or reverse rotation of the winding means are performed. , The ratchet plate 230 is rotated together by an integral engagement with 336.

However, when the rotation of the ratchet plate 230 is prevented by the swinging latch member 138, the projections 335, 336, the latch members 221, 222 of the leaf springs (325), (326) It will open to the braking position while supporting the bias.

In addition, in the third embodiment, the vehicle acceleration detecting means is different from that of the pendulum type in the first embodiment, but the detailed description is omitted since it does not have a direct relation to the nature of the action.

As described above, according to the present invention, it may be used as an emergency braking mechanism that operates by detecting webbing pull-out acceleration in a predetermined acceleration city of a vehicle during a collision or the like, or as an emergency braking mechanism that operates by directly detecting a predetermined acceleration of the vehicle. It can also be a function.

Claims (1)

A webbing belt winding device for a vehicle having a winding shaft 9 which is biased in a winding direction, which is separate from the winding shaft 9 but is installed at the same center as the winding shaft 9 and is usually wound. Rotating member 20, which is integrally rotated with the shaft 9 but has a latch gear portion which is in relative motion with the take-up shaft 9 at a predetermined acceleration and deceleration of the vehicle, is supported by the shaft as a shaft. Installed on at least one latch member 23, 24 and the take-up shaft 9 so that the latch members 23, 24 fall from the shaft center when the rotary member 20 is in a relative motion relationship with the take-up shaft 9. To the braking means 30 for engaging the latch members 23 and 24 to stop the rotation of the take-up shaft 9 when the engaging member and the latch members 23 and 24 moving in the direction move away from the shaft center. Configured to a first normal position and a second at a predetermined deceleration of the vehicle By means of inertial displacement means which can take a position, it is moved from the first position to the second position, in which the rotating member 20 passes through the latch members 23 and 24 to the latch gear portion 30a. Safety belt winding device for a vehicle with an emergency braking mechanism, characterized in that to stop the rotation of the rotating member 20 in engagement with.

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