JPH05213154A - Belt winder with tension reducing device - Google Patents

Abstract

PURPOSE: To simplify a reducing device, and to improve efficiency by constituting a case provided at the side of a winder case of a sealing structure, and loading a medium for attenuation, and loading a return spring in the medium. CONSTITUTION: A comfortable spring 14 is provided in a spring case 12 provided at the side of a belt winder case 10, and an inner edge 15 is restrained in a slit 17 of a shaft extending part 13, and an outer edge 16 is restrained in a notch 18 of a ratchet 19. The ratchet 19 is supported on a protrusion 20 in the case 12 so as to be freely rotatable, and the internal part of the case 12 is divided into a comfortable spring 14 housing space at the side of the belt winder case 10 and an outer return spring 21 housing space. An extended part 28 is formed in this spring case 12, and interfit through a sealing ring 29 on the shaft extending part 13 of the belt winder shaft 11, and liquid sealed. Then, fluid for attenuation having proper viscosity is packed until a packing level indicated by an area line 30, and the comfortable spring 14 is loaded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension reducing device acting on a safety belt retractor having a strongly constructed return spring and a weakly constructed comfort spring, both springs being a common spring. In the case, they are connected to one another via a control device which is controllable in relation to the winding state of the belt, and in one operating state these springs constitute an integral winding spring,
The invention relates to a detent safety belt retractor with a tension relief device, in which in other operating conditions only the comfort spring acts as a take-up spring and is provided with a damping device which mitigates the shocking coupling action.

[0002]

A belt winder of this kind is known from German Patent DE 38 18 175.
This belt winder first has a return spring, one end of which is hooked on a spring case and the other end of which is hooked on a ratchet wheel, and the ratchet wheel is rotatably provided on the belt winding shaft. ing. A comfort spring, which is constructed weaker than the return spring and serves as an auxiliary spring, has one end attached to the ratchet wheel and the other end attached to the belt winding shaft. At the beginning of the unwinding movement of the belt from the belt take-up shaft, the return spring and the comfort spring act as an integral spring, due to the connection via the freely rotatable ratchet wheel, from the given unwinding condition to a suitable The further rotation of the ratchet wheel is prevented via the control device, so that only the comfort spring then acts on the belt winding shaft.

The drawbacks associated with known belt winders include:
At the time of winding the belt, the return spring is added to the spring action of the comfort spring that was initially acting independently from the predetermined rewinding state through the control device and the ratchet wheel that is acted on by the control device, and the comfort that is weakened first. The spring action of the springs is pressed tightly against one another under the initiation action of the strongly constructed return spring, so that the return spring impacts the comfort spring in a lump. In order to avoid such a winding impact, a known belt winder has a braking device that brakes the rotation of the ratchet wheel, and a braking lever provided on the ratchet wheel so as to be capable of swinging outwardly has an auxiliary spring. At the controlled control position, it is pressed against the belt winder case by friction coupling to dampen the rotational movement of the ratchet wheel.

[0004]

Therefore, the problem underlying the present invention is to improve the belt winder of the first type mentioned above to simplify the construction of the damping device and to operate it efficiently. is there.

[0005]

In order to solve this problem, according to the invention, a hermetically constructed spring case is filled with a suitable medium for damping and at least the return spring is immersed in this medium. , Eg a comfort spring is provided above the filling level of the medium.

[0006]

As an advantage associated with this, when the belt rewinding motion is performed from the belt winding shaft, the return spring expands, thereby creating a gap between the individual spring windings and filling the spring case. These gaps are filled with media as the appropriate media being filled enters these gaps. Now, when the action of the return spring is applied, the medium existing between the spring windings must first be pushed out, so that the entire force of the return spring does not act impulsively, and therefore when the spring action of the return spring starts. The spring action is damped.

In this way no additional damping device or damping device is required to ensure the desired damping effect. Since the spring case is hermetically sealed and thus also sealed against external influences, the functional failure of the comfort spring device due to dust or foreign matter entering the spring case from the outside is also prevented by the configuration of the present invention. .

[0008]

According to a preferred embodiment of the invention, the medium filled in the spring case can consist of a viscous liquid or a high-viscosity liquid, or alternatively a suitable foam material.

According to a preferred embodiment of the invention, the filling level of the medium reaches the outer circumference of the comfort spring. The damping effect is largely related to the viscosity of the medium used, the depth of immersion of the return spring and other co-rotating parts into the medium, and the torque ratio between the return spring and the comfort spring, so The medium filling is performed in consideration of the above-mentioned factors.

Since the hermetically constructed spring case must also be hermetically sealed and connected to the belt winder case, the extension of the spring case fits over the axial extension of the belt take-up shaft and these A sealing ring is provided between both extensions.

Since the damping effect is related to the viscosity of the medium used, it is advisable to choose a medium with the highest possible viscosity. According to an embodiment of the invention, this medium is rustproof, which saves the surface treatment of the metal part and saves in the range of components to be used.

In accordance with another preferred embodiment of the present invention, an electromagnet is provided to control the connection between the comfort spring and the return spring to provide a latch for engaging the external teeth of the ratchet wheel which acts as a control device. In operation, such a principle is known per se from German Patent DE 38 38 175.
Here, according to the invention, the electromagnet and the latch are provided below the filling level of the medium used. The particular advantage with this is that even if the electromagnet is operated with an overcurrent, the heat associated with this overcurrent is conducted through the medium used, so that a particularly small electromagnet is used and the controller is damaged. Absent.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention is shown in the drawings, which will be described below.

A belt winding shaft 11 is supported in the belt winding device case 10, and a safety belt (not shown) is wound on the belt winding shaft. The shaft extension 13 of the belt take-up shaft 11 is inserted into the spring case 12 provided on the side of the belt take-up case 10.

A comfort spring 14 is provided in the spring case 12, an inner end 15 of which is hooked on a slit 17 of the shaft extension 13 and an outer end 16 of which is hooked on a notch 18 of a ratchet wheel 19. The ratchet wheel 19 is freely rotatable on a protrusion 20 provided inside the spring case 12, and the inner space of the spring case 12 is located closer to the belt winder case 10 to accommodate the comfort spring 14. And an outer partial space that houses the return spring 21.

The return spring 21 has a diameter larger than that of the comfort spring 14 and is made stronger. The inner end 31 is attached to the notch 32 of the cylindrical body 33 of the ratchet wheel 19, and the outer end 22 is attached to the spring case 12. It is attached to the key 23.

The ratchet wheel 19 has external teeth 25 on a tubular body 24 that enters into and surrounds the surface of the comfort spring 14, and a latch 27 that can be swung by an electromagnet 26 serves as a controller for the ratchet wheel 19. Synergize with teeth 25. The electromagnet 26 and the latch 27 are provided inside the spring case 12 so that the space given by the diameter of the comfort spring 14 which is smaller than the return spring 21 is axially adjacent to the return spring 21 and radially outside the comfort spring 14. It is used to provide an electromagnet 26 and a latch 26 on one side.

The liquid-tight spring case 12 is mounted on the belt winder case 10, so that its extension 28 is fitted onto the shaft extension 13 and between the shaft extension 13 and the extension 28. Is provided with a sealing ring 29. Since the shaft extension 13 is the only part that enters the spring case 12 from the outside, sealing is performed here.

The spring case 12 is filled with a liquid having an appropriate viscosity up to a filling level 30 shown by a chain line 30,
This liquid can also be rustproof. The filling level 30 is at the height of the outer circumference of the comfort spring 14, which allows the return spring 21 to be immersed as deeply as possible in the liquid.

With respect to the operation of the belt winder, when the belt is unwound from the belt take-up shaft 11, both springs 2
These springs behave like a single take-up spring, since 1, 14 are initially connected via a freely rotatable ratchet wheel 19. After the proper control of the electromagnet 26 in the predetermined rewinding state of the belt, the ratchet wheel 19 is engaged with the latch 27.
Since the rotational movement is blocked by this, only the comfortable spring 14 fulfills the winding function when the belt is retracted and pulled out from this point. At the same time, the return spring 21 remains in this predetermined stretched state, and in this state liquid enters between the windings of the return spring 21 which are separated from each other.

When the belt is wound, the comfort spring 14 first retracts the belt through the rotation of the belt winding shaft 11, and the latch 27 releases the ratchet wheel 19 at a predetermined time. And the winding movement initiated by the comfort spring 14 is facilitated or taken over. Before the action of the return spring 21 is applied, first, the viscous liquid between the spring windings of the return spring 21 must be pushed out, so that damping is performed at the moment when the action of the return spring is applied, and the strong spring of the return spring 21 is applied. The force acts strongly only as the winding process increases.

Since the spring case 12 can be filled with an amount of liquid such that the filling level 30 reaches above the spring winding of the comfort spring 14, at least part of the spring winding of the comfort spring 14 likewise becomes viscous. In the liquid. Thereby, the damping action can be further improved.

The spring case 12 has two parts, namely a bottom 35.
And both springs 14, 2 configured to have a lid 36
After the insertion of 1 and the filling of the liquid, they can be welded together, for example by ultrasonic welding. The spring case 12 thus filled with liquid is fitted with an extension 28, which serves as a bearing bush, onto the shaft extension 13 via a sealing ring 29, so that it can be properly attached to the belt winder case 10. Can be

The features of the subject matter of this document, which are disclosed in the foregoing description, the claims and the drawings, are important for implementing the invention in different embodiments, both individually and in any combination.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the detent safety belt winder taken along the axis of the spring side.

2 is a front view in which a part of the safety belt winder according to FIG. 1 is cut away. FIG.

[Explanation of symbols]

 10 Belt Winder Case 11 Belt Winding Shaft 12 Spring Case 14 Comfort Spring 21 Return Spring 30 Damping Medium Filling Level 24, 25, 27 Coupling Device

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[Procedure amendment]

[Submission date] January 14, 1993

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 10

[Correction method] Change

[Correction content]

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be amended] Detailed explanation of the invention

[Correction method] Change

[Correction content]

Detailed Description of the Invention

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Michael Gravinsky Hamburg 74 Germany Corfu Elvewek 75 (72) Inventor Ronald Jabtscyuer Federal Republic of Germany Elmshorn am Erlengrund 13

Claims (10)

[Claims] 1. A tension-relieving device acting on a safety belt retractor has a strongly configured return spring and a weakly configured comfort spring, both springs of a belt spring in a common spring case. They are connected to one another via a coupling device which is controllable in relation to the winding state, so that in one operating state these springs form an integral winding spring and in the other operating state only the comfort spring is a winding spring. Which is provided with a damping device which acts as a shock absorber and reduces the shocking coupling action, the spring case, which is hermetically sealed, is filled with a suitable medium for damping and at least the return spring (21) is A detent safety belt retractor with a tension relief device that is submerged in the medium. 2. Safety belt retractor according to claim 1, characterized in that the liquid-tight spring case (12) is filled with viscous liquid as medium. 3. Safety belt retractor according to claim 2, characterized in that the liquid with which the spring case (12) is filled has a high viscosity. 4. Safety belt retractor according to claim 1, characterized in that the spring case (12) is filled with a suitable foam material. 5. A filling spring (14) having a filling level (30).
It reaches to the place of the outer circumference of
To 4 of the safety belt winder 6. The comfort spring (14) also has a partially filled level (3).
Safety belt retractor according to one of claims 1 to 4, characterized in that it is provided below 0). 7. The spring case (12) is fitted onto the shaft extension (13) of the belt winding shaft (11) until the spring case (12) hits the belt winder case (10), and the spring case ( A sealing ring (29) is provided between the belt winding shaft (11) and the belt winding shaft (11).
A safety belt retractor according to any one of 1 to 6. 8. The spring case (12) has two parts (3).
5, 36), characterized in that these parts are hermetically welded together.
1. A safety belt winder according to one of 1. 9. The safety belt retractor according to claim 1, wherein the medium with which the spring case (12) is filled is rustproof. 10. Comfort spring (14) and return spring (21).
A device for controlling the connection with is formed by an electromagnet (26) and a latch (27) operated by this, which latch connects the two springs (14, 21).
9) acting on the outer teeth (25) of the electromagnet (26) and the latch (27) in the spring case (12) below the filling level (30) of the filling medium,
A safety belt retractor according to claim 1.