KR102558291B1 - Tension reducer for seatbelt of automobile - Google Patents

Abstract

A seat belt pressure reducing device according to the present invention is a seat belt pressure reducing device that is connected to a spool into which webbing is wound by a shaft-coupled return spring to reduce the winding force of the webbing, and includes a link part that is shaft-coupled to the spool and transmits a driving force in one direction according to an electrical signal, and a clutch part that is shaft-coupled to the link part and transmits rotational resistance in a direction in which the webbing is pulled into the spool by receiving the driving force, and the link part moves in a first direction toward the clutch part according to the electrical signal to pressurize the clutch part. Alternatively, it is separated from the clutch unit by transmitting power to be moved in the second direction opposite to the first direction.

Description

Seat belt pressure reducing device {TENSION REDUCER FOR SEATBELT OF AUTOMOBILE}

The present invention relates to a seat belt pressure reducing device, and more particularly, to a seat belt pressure reducing device for relieving a wearer's feeling of pressure caused by a retractor winding force when wearing a seat belt.

In the case of wearing a seat belt, since the webbing of the seat belt presses on the occupant's chest to reduce comfort, various types of seat belt compression reducing devices have been developed to relieve the above-described pressure.

As an example of such a seat belt pressure reducing device, Korean Patent Registration No. 10-0506675 uses two pairs of springs to operate two springs before wearing the belt and operate only one spring when the belt is worn.

Vehicles to which such a conventional seat belt pressure reducing device can be applied are also extremely limited.

In particular, due to the use of a plurality of springs, the structure is complicated, and mechanical defects may occur, including a problem that the pressure reduction function does not work properly, and the width of the spring is reduced, resulting in a decrease in durability. There is a problem that can occur frequently.

The present invention is to solve the above problems, and it is an object of the present invention to provide a seat belt pressure reducing device capable of implementing the same function as the conventional seat belt pressure reducing device by using only one spring instead of two pairs of springs, which was the cause of the conventional problem.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

In order to solve the above problems, according to one aspect of the present invention, a seat belt pressure reducing device is connected to a spool into which a webbing is wound by a shaft-coupled return spring to reduce a winding force of the webbing. and a clutch part axially coupled to the link part, receiving the driving force and transmitting a rotation resistance force in a direction in which the webbing is pulled into the spool, wherein the link part may move in a first direction toward the clutch part according to an electrical signal to press the clutch part, or transfer power to be moved in a second direction opposite to the first direction, and may be spaced apart from the clutch part.

Here, the link unit includes a fixing member that is concentrically arranged and fixed to one side of the return spring; and a rotational movement member that is disposed concentrically with the fixing member, rotates according to an electrical signal, and moves along a rotation axis at the same time.

When the rotating member rotates in one direction, it is spaced apart from the fixing member and moves in the first direction to contact the clutch unit, and when it rotates in the opposite direction to the one direction, it moves in the second direction along the rotation axis. Contact with the clutch unit can be released.

In addition, the fixing member may include a first inclined protrusion formed to have an upward slope in the one direction.

In addition, the rotating member may include a second inclined projection having a downward slope in the one direction.

Here, when the rotational member is relatively rotated with the fixing member, the rotational member and the fixing member may be separated from each other while the second inclined projection moves along the surface of the first inclined projection.

In addition, when the rotational member moves in the first direction, a pressing and fixing surface formed at a position facing the clutch unit may protrude one side of the clutch unit.

The pressing and fixing surface may include a first surface in contact with a portion of the clutch part; and a second surface that presses the other part of the clutch part so that the other part of the clutch part concentric with the part of the clutch part protrudes in the first direction.

The link unit may further include a wearing signal member for rotating the rotational member in one direction according to an electrical signal.

The clutch unit may include a clutch shaft disposed concentrically with the spool, protruded in the first direction by the link unit, and engaged with the spool to rotate; a clutch ring disposed concentrically with the clutch shaft and rotating in accordance with rotation of the clutch shaft in a direction in which the webbing is retracted; and a clutch case disposed concentrically with the clutch ring and contacting an outer circumferential surface of the clutch ring to generate frictional force.

In addition, a rotation dependent module may be provided between the clutch shaft and the clutch ring so that the clutch unit rotates in a subordinate manner to the clutch shaft when the webbing rotates in a retracted direction.

In addition, the rotation dependent module may be inserted into an insertion groove formed in a direction from an inner circumferential surface to an outer circumferential surface of the clutch ring, and contact or release contact with the outer circumferential surface of the clutch shaft.

According to the seat belt pressure reducing device of the present invention, the following effects are obtained.

There is an effect that quality problems can be prevented and productivity can be improved through a simple structure using only one spring instead of the conventional method of applying two pairs of springs, which was the cause of problems.

In addition, it can be applied to various types of vehicles through a simple structure, and the width of the spring can be designed to improve durability.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

The above summary, as well as the detailed description of the preferred embodiments of the present application set forth below, will be better understood when read in conjunction with the accompanying drawings. Preferred embodiments are shown in the drawings for the purpose of illustrating the present invention. However, it should be understood that this application is not limited to the precise arrangements and instrumentalities shown.
1 is a view showing a state in which a seat belt pressure reducing device according to an embodiment of the present invention is connected to a spool into which webbing is wound by a shaft-coupled return spring;
2 is a view showing a side view of a seat belt pressure reducing device according to an embodiment of the present invention;
Figure 3 is a view for explaining the link portion of the seat belt pressure reducing device according to an embodiment of the present invention;
4 is a view for explaining the rotational movement member of the link part in the seat belt pressure reducing device according to an embodiment of the present invention;
5 is a view for explaining a state in which a rotating member of a link unit is provided in a state adjacent to a fixing member in a seat belt pressure reducing device according to an embodiment of the present invention;
FIG. 6 is a view for explaining how the rotational member of FIG. 5 moves in a first direction and transmits a driving force to a clutch unit;
7 is an exploded perspective view for explaining a clutch part of a seat belt pressure reducing device according to an embodiment of the present invention;
8 is a view for explaining a state in which a clutch ring is subordinated to a clutch shaft due to a rotation dependent module of a clutch unit in a seat belt pressure reducing device according to an embodiment of the present invention;
9 is a view for explaining how a clutch ring is idling in a seat belt pressure reduction device according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention in which the object of the present invention can be realized in detail will be described with reference to the accompanying drawings. In describing the present embodiment, the same name and the same reference numeral are used for the same configuration, and additional description thereof will be omitted.

1 is a view showing a seat belt pressure reducing device according to an embodiment of the present invention connected to a spool into which webbing is wound by a shaft-coupled return spring, FIG. 2 is a side view of the seat belt pressure reducing device according to an embodiment of the present invention, FIG. 3 is a view for explaining the link portion of the seat belt pressure reducing device according to an embodiment of the present invention, and FIG. FIG. 5 is a view for explaining how the rotational member of the link unit is provided in a state adjacent to the fixing member in the seat belt pressure reducing device according to an embodiment of the present invention, FIG. 6 is a view for explaining how the rotational member of FIG. 5 moves in a first direction and transmits a driving force to the clutch part, and FIG. This is a view for explaining how the clutch ring is subordinated to the clutch shaft due to the rotation dependent module of the clutch unit in the seat belt pressure reducing device, and FIG. 9 is a view for explaining how the clutch ring is idling in the seat belt pressure reducing device according to an embodiment of the present invention.

As shown in FIGS. 1 and 2 , the seat belt pressure reducing device 10 according to an embodiment of the present invention may largely include a link part 100 and a clutch part 200.

The seat belt pressure reducing device 10 of the present invention may be connected to a spool S through which the webbing is wound by a return spring R coupled to the seat belt axis, and the spool S may be arranged so that the webbing connected inside the frame F is unwound to the outside of the frame F or wound inside the frame F.

Here, if the seat belt pressure reducing device 10 of the present invention can relieve the pressure felt by the wearer by reducing the winding force of the webbing to be wound, the shape of the return spring R and the spool S as described above may be as shown in FIG.

First, the link unit 100 may be axially coupled to the spool S to transmit driving force to the clutch unit 200 according to an electrical signal.

At this time, the clutch unit 200 axially coupled to the link unit 100 may receive a driving force from the link and transfer a rotation resistance force in a direction in which the webbing is retracted to the spool S.

Specifically, the link unit 100 may be separated from the clutch unit 200 by moving in a first direction toward the clutch unit 200 to press the clutch unit 200 according to an electrical signal such as, for example, a seat belt wearing signal, or by transmitting power to be moved in a second direction opposite to the above-described first direction.

For example, a part of the link part 100 protrudes toward the clutch part 200 to pressurize the clutch part 200, or a part of the link part 100 is returned to the opposite direction of the clutch part 200 again to release the pressure on the clutch part 200. It can be provided in a structure.

The link unit 100 may include, in detail, a fixing member 120 and a rotational moving member 140, and the fixing member 120 may be concentrically arranged and fixed to one side of the return spring R.

Since the first inclined projection 160b is formed in the fixedly arranged fixing member 120, the rotational member 140, which will be described later, can move along the inclined surface of the first inclined projection 160b to move in the first direction.

The rotational member 140 may be disposed concentrically with the fixing member 120 so as to be rotated according to an electrical signal and simultaneously moved in a first direction or a second direction along a rotation axis.

Specifically, when the rotational member 140 rotates in one direction, it may come into contact with the clutch unit 200 by being separated from the fixing member 120 and moving in the first direction.

Conversely, if it rotates in the opposite direction to the one direction, contact with the clutch unit 200 may be released by moving in the second direction along the rotation axis.

A detailed description of the structure in which the fixing member 120 and the rotational member 140 can be spaced apart is as follows.

First, a second inclined projection 160a having a downward slope in one direction may be formed on the rotational member 140 .

At this time, the fixing member 120 may be formed so that the first inclined projection 160b as described above has an upward slope in one direction.

Therefore, when the rotational member 140 rotates relative to the stationary member 120, the rotational movement member 140 and the stationary member 120 may be spaced apart while the second inclined projection 160a is moved along the surface of the first inclined projection 160b.

In other words, the rotational moving member 140 is spaced apart from the fixing member 120 while climbing the inclined surface of the first inclined projection 160b formed on the fixing member 120 so as to have an upward slope in one direction. It can be moved in the first direction.

Here, one direction may be a direction in which the webbing is retracted.

In addition, when the rotational member 140 moves in the first direction, a pressing and fixing surface formed at a position facing the clutch unit 200 may protrude one side of the clutch unit 200 .

Specifically, the pressing and fixing surface of the rotational member 140 may move in a first direction and pressurize the clutch shaft 240 to be described later so as to bring it into close contact with the spool (S).

For example, the press fixing surface may include a first surface 142 and a second surface 144, and in this case, the first surface 142 may be provided to come into contact with a portion of the clutch unit 200.

In addition, the second surface 144 may press the clutch part 200 so that the other part of the clutch part 200 concentric with a part of the clutch part 200, that is, the clutch shaft 240 protrudes in the first direction.

For example, when the rotational member 140 rotates in one direction, it is separated from the fixing member 120 and moves in a first direction. At this time, the first surface 142 of the pressing and fixing surface formed in a ring shape is in contact with the clutch ring 220 of the clutch unit 200 to be described later, and the second surface 144 provided in a ring shape protrudes the clutch shaft 240 of the clutch unit 200 to be described later in the first direction. so that it can adhere to the spool (S).

In this case, the first surface 142 and the second surface 144 may have a step in the rotation axis direction.

The link unit 100 having the configuration as described above may further include a wearing signal member 180 that rotates the rotational member 140 in one direction according to an electrical signal. At this time, the electrical signal may be a wearing signal indicating that the webbing is worn on the seat belt.

For example, when the link unit 100 receives a wearing signal indicating that the occupant's webbing is worn on the seat belt, the rotating member 140 is rotated in one direction through the wearing signal member 180 provided in the form of a solenoid valve. The fixing member 120 and the rotating member 140 may be spaced apart from each other.

Next, the structure of the clutch unit 200 will be described in detail.

The clutch unit 200 may largely include a clutch shaft 240, a clutch ring 220, and a clutch housing 210, and the clutch shaft 240 protrudes in a first direction by the link unit 100 described above.

In addition, as shown in the drawing, the clutch shaft 240 may have a plurality of friction protrusions 240a disposed on the opposite surface of the spool S.

At this time, friction protrusions S1 arranged to be engaged with each other when the clutch shaft 240 moves toward the spool S may be formed on the spool S by being positioned between the aforementioned friction protrusions 240a of the clutch shaft 240.

Next, the clutch ring 220 is disposed concentrically with the clutch shaft 240 so as to be dependent on the rotation of the clutch shaft 240 in the direction in which the webbing is drawn in, and the outer circumferential surface of the clutch shaft 240 may be provided to come into contact with the inner circumferential surface of the clutch ring 220.

In addition, the clutch housing 210 is disposed concentrically with the clutch ring 220 so as to be in contact with the outer circumferential surface of the clutch ring 220 to generate frictional force, and the outer circumferential surface of the clutch ring 220 can be provided to rotate in contact with one side of the inner circumferential surface of the clutch housing 210.

At this time, in the clutch unit 200, a rotation dependent module 260 may be provided between the clutch shaft 240 and the clutch ring 220.

Therefore, when the rotation dependent module 260 rotates in the direction in which the webbing is drawn in, the clutch unit 200 may be rotated dependent on the clutch shaft 240 .

In detail, the rotation dependent module 260 may be inserted into the insertion groove 220a formed in the direction from the inner circumferential surface to the outer circumferential surface of the clutch ring 220 so as to contact or release contact with the outer circumferential surface of the clutch shaft 240 .

In other words, a separation space is formed between the clutch ring 220 and the clutch shaft 240 by the insertion groove 220a, and the rotation dependent module 260 provided in the above-described separation space is provided to selectively contact the outer circumferential surface of the clutch shaft 240, so that when the spool S rotates in the direction in which the webbing is retracted, the clutch ring 220 is dependent on the clutch shaft 240 and rotates together, and the spool S When the webbing rotates in the opposite direction to which the webbing is retracted, the clutch ring 220 may be provided to idle without being dependent on the clutch shaft 240 .

For example, the clutch shaft 240 receives driving force from the rotational member 140 and protrudes in a first direction to contact the spool S while rotating in the same direction and speed as the spool S.

In addition, the insertion groove 220a of the clutch ring 220 is provided with a narrow width in the direction in which the webbing is inserted, and the rotation dependent module 260 is moved from one side of the narrow insertion groove 220a to the other wide side. It may be provided to return to the original position.

Therefore, when the rotational member 140 moves in the first direction by the wearing signal of the seat belt and the clutch shaft 240 engages with the spool S and rotates together, the clutch shaft 240 also rotates in the direction in which the webbing is drawn like the spool S, and friction with the rotation dependent module 260 may continuously occur, as shown in the drawing.

However, since the rotation dependent module 260 cannot move in the rotational direction of the clutch shaft 240 any longer due to the narrow width of the insertion groove 220a, the rotation dependent module 260 is sandwiched between the clutch shaft 240 and the clutch ring 220, and thus the clutch ring 220 is dependent on the clutch shaft 240 and can rotate together.

Accordingly, the torque of the clutch shaft 240 is transmitted to the clutch housing 210 and friction is generated between them, thereby reducing the winding force of the webbing.

At this time, the clutch housing 210 may be provided with a friction ring 280 to maintain a hysteresis characteristic by lengthening the load holding section and to improve durability of the clutch housing 210 .

On the other hand, when the spool (S) rotates in the direction in which the webbing is pulled out, even if the rotation dependent module 260 is moved to the other side of the insertion groove 220a by the clutch shaft 240, it is not caught between the clutch shaft 240 and the clutch ring 220. As a result, the torque of the clutch shaft 240 is not transmitted to the clutch housing 210, so that the winding-in and winding power of the webbing is not affected.

Therefore, the seat belt pressure reducing device of the present invention having the configuration as described above can prevent quality problems and improve productivity through a simple structure using only one spring instead of two pairs of springs, which has been the cause of conventional problems.

As described above, the preferred embodiments according to the present invention have been reviewed, and the fact that the present invention can be embodied in other specific forms in addition to the above-described embodiments without departing from the spirit or scope is common knowledge in the art. It is obvious to those who have. Therefore, the embodiments described above are to be regarded as illustrative rather than restrictive, and thus the present invention is not limited to the above description, but may vary within the scope of the appended claims and their equivalents.

S: spool
F: frame
R: return spring
10: seat belt pressure reducing device
100: link unit
120: fixing member
140: rotating member
180: wearing signal member
200: clutch unit

Claims (10)

A seat belt pressure reducing device connected to a spool into which the webbing is wound by a shaft-coupled return spring to reduce the winding force of the webbing,
a link unit that is axially coupled to the spool and transmits a driving force in one direction according to an electrical signal; and
And a clutch part that is axially coupled to the link part and receives the driving force to transmit a rotation resistance force in a direction in which the webbing is drawn into the spool.
The link part,
Moves in a first direction toward the clutch part according to an electrical signal to press the clutch part or moves in a second direction opposite to the first direction to move away from the clutch part by transmitting a driving force,
It includes a fixing member concentrically disposed and fixed to one side of the return spring and a rotational moving member concentrically disposed with the fixing member and rotating according to an electrical signal and simultaneously moving along a rotating shaft,
The rotational moving member,
When it rotates in one direction, it is separated from the fixing member and moves in the first direction to contact the clutch unit, and when it rotates in the opposite direction to the one direction, contact with the clutch unit is released by moving in the second direction along the axis of rotation,
Characterized in that, when moving in the first direction, a pressing and fixing surface formed at a position facing the clutch unit protrudes one side of the clutch unit,
Seatbelt pressure reducer.
delete delete According to claim 1,
The fixing member includes a first inclined protrusion formed to have an upward slope in the one direction,
The rotational member includes a second inclined projection having a downward slope in the one direction,
When the rotating member is rotated relative to the fixing member, the second inclined projection is moved along the surface of the first inclined projection, characterized in that the rotating member and the fixing member are spaced apart.
Seatbelt pressure reducer.
delete According to claim 1,
The pressure fixing surface,
a first surface in contact with a portion of the clutch part; and
And a second surface for pressing the other part of the clutch part so that the other part of the clutch part concentric with the part of the clutch part protrudes in the first direction.
Seatbelt pressure reducer.
According to claim 1,
The link part,
Characterized in that it further comprises a wearing signal member for rotating the rotating member in one direction according to the electrical signal,
Seatbelt pressure reducer.
According to claim 1,
The clutch part,
a clutch shaft disposed concentrically with the spool, projected in the first direction by the link part, and engaged with the spool to rotate;
a clutch ring disposed concentrically with the clutch shaft and rotating in accordance with rotation of the clutch shaft in a direction in which the webbing is retracted; and
Characterized in that it comprises a clutch case disposed concentrically with the clutch ring and generating frictional force in contact with the outer circumferential surface of the clutch ring.
Seatbelt pressure reducer.
According to claim 8,
The clutch part,
Characterized in that a rotation dependent module is provided between the clutch shaft and the clutch ring so that when the webbing rotates in the retracted direction, the rotation is dependent on the clutch shaft.
Seatbelt pressure reducer.
According to claim 9,
The rotation dependent module,
Characterized in that it is inserted into the insertion groove formed in the direction from the inner circumferential surface to the outer circumferential surface of the clutch ring and contacts or releases contact with the outer circumferential surface of the clutch shaft.
Seatbelt pressure reducer.

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