JPH0213264Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frame structure for a webbing retractor, which is used in a seat belt device for protecting occupants in vehicle emergencies and constitutes a frame of the webbing retractor.

In a webbing retractor that is used in a seat belt device to wind up the end of occupant restraint webbing, a take-up shaft that winds up the webbing is pivotally supported by a frame, and this frame is fixed to the vehicle body. ing.

However, since the attachment portion of the frame to the vehicle body differs for each type of vehicle, it is necessary to prepare frames of many different shapes, resulting in a problem of high cost.

In order to solve this problem, in Utility Model Application No. 56-28348,
A frame structure has been proposed in which a frame part that supports a winding shaft and a stay part that supports this frame part to a vehicle body are separate bodies, so that parts can be shared.

In the above frame structure, the stay part is inserted into a rectangular through hole provided in the frame part, and the engaging part provided in the stay is brought into contact with the inner wall of the through hole to prevent the stay from coming out of the through hole. To prevent this, the frame portion is reliably supported to the vehicle body even in a vehicle emergency.

However, in the frame structure proposed in the above publication, if the stay is bent or a load is applied diagonally to the stay, the engagement part of the stay and the inner wall of the through hole will be Since they abut linearly, the stay rotates within the through hole in the event of a vehicle emergency. As the stay rotates within the through hole, the inner wall of the through hole and the engaging portion of the stay come into point contact, and stress in the event of a vehicle emergency is concentrated on the stay and the inner wall of the through hole. Therefore, there is a risk that the stay may be deformed.

Therefore, the conventional frame structure cannot reliably support the frame to the vehicle body in a vehicle emergency and cannot be applied to webbing retractors of various vehicles.

The present invention has been made in consideration of the above facts, and an object of the present invention is to provide a frame structure for a webbing retractor that can be used with webbing retractors of various vehicles and has sufficient strength even in a vehicle emergency.

The frame structure for a webbing retractor according to the present invention has a support hole into which the other end of the stay is inserted and an inner wall surface of which is in contact with an arc-shaped bent portion provided on the other end of the stay. It is characterized by having a frame.

Therefore, since the frame and the stay are separate bodies, the frame can be uniformly applied to various vehicles, and the stay is provided with an arc-shaped bent part, and the support hole 22 that this bent part comes into contact with is formed in the support hole 22. Since the contact part of the inner wall is an arc-shaped bent part, if the stay is bent or a load is applied diagonally in a vehicle emergency, the bent part of the stay and the arc-shaped support hole 22 will come into surface contact. However, stress is not concentrated at the bent portion of the stay. This allows the frame to be reliably supported on the vehicle body.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the main portion of the frame structure 10 according to this embodiment is composed of a frame body 12 and a stay 14.

The outer shape of the frame body 12 is formed by punching a thin steel material, and the frame body 12
Both sides of the leg plate 16 and 18 are bent at right angles and extend parallel to each other. A circular hole 20 is coaxially formed in each of these leg plates 16 and 18 to support a winding shaft (not shown). This winding shaft is designed to wind up and store the ends of the occupant restraint webbing in layers.

A support hole 22 is provided in the center of the frame body 12.
is bored and a bent portion 14A formed at the middle portion of the stay 14 is inserted. Similar to the frame body 12, this stay 14 has an outer shape formed by punching out a thin steel plate, and a base part 14B and a tip part 14C, which are arranged to sandwich the bent part 14A, are arranged in parallel, and the tip If the portion 14C is penetrated into the support hole 22, the surface of the tip portion 14C and the base portion 1
The back surface of the portion of the frame 4B near the bent portion 14A is in contact with the surface of the frame body 12.

The tip 14C of this stay 14 has a U in the center.
A groove 24 is formed to receive a locking pin 26 projecting to the back surface of the frame body 12.
Further, a rivet 28 is applied between the stay base 14B and the frame body 12 on the side opposite to the locking pin 26 with respect to the support hole 22, so that the stay 14 and the frame body 12 are engaged.

This rivet 28, locking pin 26 and U-shaped groove 2
4, the frame body 12 and the stay 14 are integrated in the normal state, and the stay base 1
Insert the mounting bolt 3 into the circular hole 30 provided at the tip of 4B.
2 is applied and the stay base 14B is fastened to the vehicle body 34, the frame body 10 can be erected inside the vehicle.

Here, the rivet 28 and the locking pin 26 are arranged on the center line of the frame main body 12, but the mounting bolt 32 of the stay 14 is arranged eccentrically from the center of the frame main body 12. That is, the rivet 28 is arranged on one side of the straight line connecting the locking pin 26 and the mounting bolt 32. Therefore, the frame body 1
When a load is applied to the webbing in the longitudinal direction (direction of arrow A in Fig. 2) on the webbing 2, the rivet 28 receives shearing force, and after the rivet 28 is sheared, the stay 14 engages the locking pin against the frame body 12. It has a structure that allows relative rotation around 26 rotations.

In this embodiment, the support hole 22 of the frame body 12
is said to have a bent shape. That is, the peripheral edge of the support hole 22 that the stay bent portion 14A comes into contact with has a substantially arc shape centered on the locking pin 26, and the stay bend portion 14A is also a curved surface that follows this arc shape. I am in face-to-face contact with.

A pair of protrusions 36 protrude from both sides of the tip 14C of the stay 14 toward the bent portion 14A, and these protrusions 36 sandwich the frame body 12 between them and the base 14B.

The frame structure 10 of this embodiment configured as described above is brought into the state shown in FIGS. 1 and 2 by inserting the stay 14 into the frame support hole 22 from the tip 14C,
The locking pin 26 and the U-shaped groove 24 are engaged and the rivet 2 is
Assembly is completed by fitting the frame body 12 and the stay base 14B at step 8.

After installing a take-up shaft for winding up the webbing end into this frame structure 10, and incorporating an inertia lock mechanism that stops the webbing pull-out rotation of the take-up shaft in case of a vehicle emergency, the stay base 14B
Apply the mounting bolts 32 to the vehicle body 34 to erect it.

The occupant drives the vehicle after attaching the wound webbing to the take-up shaft, but in the event of an emergency such as a vehicle collision, the inertia lock mechanism operates and the webbing restrains the occupant, ensuring the safety of the occupant. In this restrained state, a large pulling force (in the direction of arrow A) is exerted on the frame body 12 due to the inertia of the occupant.
acts.

When this tensile force is less than a predetermined value, the frame body 10 maintains the state shown in FIGS. 1 and 2 to ensure that the webbing tension is supported to the vehicle body 34. Also, if the webbing tension exceeds a predetermined value, the rivet 28
As a result, the stay 14 and frame body 12 rotate relative to each other around the locking pin 26, but both sides of the stay 14 abut against both sides of the support hole 22, and this relative rotation is stopped. When the rivet 28 is broken, the stay 14 receives a load in the direction of coming out of the frame body 12 due to the tensile force of the webbing, but since the stay bent portion 14A is an arcuate bent portion, it does not easily deform. , maintains the engaged state with the frame body 12. This stay bending part 14A has surface contact between the bending part 14A and the support hole 22 on an arcuate curved surface, so that deformation prevention is not proven even though a large load is not concentrated on the stay bending part 14A. There is.

Therefore, the occupant is kept securely restrained by the webbing, improving safety.

Note that the positions of the locking pin 26 and the rivet 28 may be interchanged, and in this case, the arc of the bent portion 14A may be made upwardly convex.

As explained above, in the frame structure for a webbing retractor according to the present invention, the frame and the stay are separate bodies, and the other end of the stay is inserted and comes into contact with the arc-shaped bent part provided on the other end of the stay. Since the frame is provided with a support hole in which the inner wall surface is formed in an arc shape, the frame can be used in common with many types of vehicles, and in the event of a vehicle emergency, the bent portion of the stay and the inner wall surface of the support hole are Because of the contact, stress does not concentrate on the stay bending part and the inner wall surface.
This provides an excellent effect in that the frame can be reliably supported on the vehicle body.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view showing an embodiment of a frame structure for a webbing retractor according to the present invention, FIG. 2 is a left side view of FIG. 1, and FIG. 3 is a perspective view showing a stay. 10... Frame structure, 12... Frame body, 14... Stay, 22... Support hole.

Claims (1)

[Scope of utility model registration request] A frame structure for a webbing retractor in which a frame on which a take-up shaft for retracting webbing for occupant restraint is pivotally supported is connected to the other end of the stay, one end of which is connected to the vehicle body, and supported by the vehicle body, wherein the frame structure is supported by the vehicle body. A webbing winding characterized in that the frame is provided with a support hole into which the other end of the stay is inserted and whose inner wall surface is formed in an arc shape and comes into contact with an arc-shaped bent portion provided on the other end side of the stay. Frame structure for extraction equipment.