JPH0334358Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a seat belt retractor used in vehicles, etc.

(b) Technical Background and Problems As a conventional seat belt retractor, there is one shown in FIG. 3, for example. That is, this seatbelt retractor is formed into a U-shaped cross section consisting of a rear wall 101a and left and right side walls 101b integrally bent from the rear wall 101a, and a reinforcing plate 103 is attached to the front opening. Housing 10
1, a seatbelt take-up shaft 107 that is rotatably supported by the housing 101 and biased in the winding direction of the seatbelt 105, and a lock member 109 that locks the seatbelt take-up shaft 107 to the housing 101. , an actuating device 111 that senses an angular velocity of the seat belt take-up shaft 107 of a certain value or more to move the lock member 109 toward the housing 101; and an actuator 111 that senses an acceleration of the vehicle body of a certain value or more to move the lock member 109 toward the housing 101. and an actuating device 113 for moving it to.

However, in such a conventional seat belt retractor, the rear wall 1 of the housing 101 is
01a and the inner surface of the reinforcing plate 103 are formed with edge corner portions as edges perpendicular to the direction of feeding and winding up the seat belt 105. is housing 10
There was a risk that the fibers would come into contact with the edge corners of the rear wall 101a and the reinforcing plate 103 of No. 1 and become fluffed, damaging the appearance.

As a means to prevent such fuzzing of the seat belt, it is known to attach a protector separately from the housing 101, but in this case, not only does the number of parts increase, but also the number of parts increases due to the assembly. There was a problem that the number of man-hours increased and the cost became high.

Further, the housing 101 includes a seat belt 10.
Since a large shock load is applied when the housing 5 is locked, and it is necessary to maintain the same strength, the housing 1 is
01 had to be made thicker, which was disadvantageous for weight reduction and cost reduction.

(c) Purpose of the invention This invention was made in view of the problems of the conventional technology, and is to provide a seat belt retractor that can prevent fuzzing of the seat belt and is advantageous in terms of weight reduction. With the goal.

(d) Structure of the invention In order to achieve the above object, this invention includes a housing that includes a rear wall, left and right side walls, a reinforcing plate that connects the front edges of the left and right side walls, and a structure between the left and right side walls of the housing. In the seat belt retractor, the seat belt retractor includes a retractor shaft rotatably supported by a retractor for retracting the seat belt in a freely retractable manner; The seat belt is characterized by having a protrusion extending over the entire width of the seat belt and being curved toward the seat belt side. (e) Examples This invention will be explained below based on the drawings.

FIG. 1 is an exploded perspective view of a seat belt retractor according to an embodiment of the invention, and FIG. 2 is a side sectional view of the housing shown in FIG. 1.

First, the configuration will be described. The housing 1 accommodates the seat belt 3 wound by the biasing force of a spiral spring (not shown), and is fixed to the vehicle body side (not shown). The housing 1 is formed into a U-shaped cross section, consisting of a rear wall 1a and left and right side walls 1b integrally bent from the rear wall 1a. As shown in FIG. 2, an edge corner portion as an edge of the rear wall 1a of the housing 1 is provided to protrude toward the inside of the housing 1, which is the seatbelt 3 side, and is used for feeding and winding the seatbelt 3. A protruding portion 1c having a rounded tip perpendicular to the taking direction is provided over the entire width of the seat belt in the width direction. A reinforcing plate 5 is attached to the front side of the housing 1, that is, the opening side, and connects the front edge of the side wall 1b. As shown in FIG. 2, this reinforcing plate 5 has a protruding ridge portion that protrudes toward the inside of the housing 1, which is the side of the seat belt 3, and has a rounded tip that is perpendicular to the direction of feeding and winding the seat belt. 5a is formed over the entire width of the seat belt 3 in the width direction. Both side walls 1b of the housing 1
A shaft support hole 1d is formed in the shaft support hole 1d, and a seat belt take-up shaft 7 is rotatably supported in this shaft support hole 1d. Furthermore, this seat belt retractor includes a lock member 9 that locks the seat belt retractor shaft 7 to the housing 1;
The locking member 9 is moved to the housing 1 by sensing the angular velocity of the seatbelt take-up shaft 7 above a certain level.
It is comprised of an actuating device 11 that moves the locking member 9 in the direction of the housing 1, and an actuating device 13 that senses acceleration of the vehicle body above a certain level and moves the locking member 9 in the direction of the housing 1.

Next, the operation of the above embodiment will be explained.

First, when the vehicle body is in a normal running state, the lock member 9 is disengaged from the housing 1 side, and the seat belt take-up shaft 7 is free to rotate. Therefore, the seat belt 3 is freely extended according to the movement of the occupant, and the occupant's body is not restrained by the seat belt 3.

Next, when the seatbelt 3 is about to be let out at a rapid speed in the event of a vehicle collision, etc., the locking member 9 engages and moves toward the housing 1, and the seatbelt take-up shaft 7 is pulled out from the housing via the locking member 9. 1 side, and the rotation of the seat belt take-up shaft 7 is locked. Therefore, the seat belt 3 is prevented from being extended, and the safety of the occupant is ensured.
Except for the load acting on the seat belt 3, the seat belt 3 is wound up by the biasing force of a spring (not shown).

When the seatbelt 3 is fed out and wound up as described above, the seatbelt 3 is attached to the tips formed over the entire width of the seatbelt 3 on the inner surfaces of the rear wall 1a of the housing 1 and the reinforcing plate 5. It contacts the protrusions 1c and 5a having rounded sides. Therefore, the seat belt 3 is prevented from fuzzing, thread breakage, etc., and a decrease in strength is prevented. In addition, even if an impact load is applied to the housing 1 when the seat belt 3 is locked, the section modulus of the housing 1 is increased by the protrusions 1c and 5a, and the rigidity is increased, so the thickness of the housing can be made thinner. However, the device can withstand impact loads sufficiently, and the weight of the device can be reduced.

(f) Effects of the device As is clear from the above, according to this device, the protrusion extends over the entire width of the seatbelt near the edge of the rear wall and reinforcing plate, so that the seatbelt does not extend. Also, during winding, the seat belt is not scraped off by the inner surface of the housing, and fuzzing of the seat belt can be prevented. In addition, the ridges increase the section modulus of the housing and increase its rigidity, so even if the thickness of the housing is made thinner, it can sufficiently withstand the impact load that is applied when the seatbelt is locked, reducing the weight of the device. It is also possible to aim for

Furthermore, separate parts such as a protector for protecting the seat belt are not required, and the number of parts and assembly man-hours can be reduced, and cost reduction can be expected.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a seatbelt retractor according to an embodiment of the invention, FIG. 2 is a side sectional view of the housing shown in FIG. 1, and third is an exploded perspective view of a conventional seatbelt retractor. It is a diagram. Explanation of symbols representing main parts of the drawings: 1...Housing, 1a...Rear wall, 1c, 5a...Protrusion portion, 3
... Seat belt, 5... Reinforcement plate, 7... Seat belt take-up shaft.

Claims (1)

[Scope of utility model registration request] A housing that includes a rear wall, left and right side walls, and a reinforcing plate that connects the front edges of the left and right side walls, and a winder that is rotatably supported between the left and right side walls of the housing and that freely lets out and winds up the seat belt. In the seatbelt retractor including a shaft, a seatbelt retractor is provided near an edge of the rear wall of the housing and the reinforcing plate, and extends over the entire width of the seatbelt in the width direction, and is curved toward the seatbelt side. A seatbelt retractor characterized in that it is provided with a protrusion section.