JP3002695U - Transmission device for vehicle steering - Google Patents

Abstract

(57) [Abstract] [Purpose] For example, in a transmission device for transmitting and receiving an electric signal in a steering device of a vehicle equipped with an airbag, the vicinity of the inner end of the strip-shaped electric wire is inverted and bent in an S-shape, and the repetition thereof causes This prevents the strip-shaped electric wire from being cut. [Structure] First housing (2) having outer cylinder (1)
And a second housing (4) having an inner cylinder (3),
A ring-shaped space (5) is maintained between the inner cylinder and the outer cylinder so as to be concentrically rotatable, and the inner end portion of the electrically conductive strip-shaped electric wire (6) formed in a spiral shape is connected to the ring-shaped space. In a vehicle steering transmission device in which the outer end of the band-shaped electric wire is fixed to the outer cylinder while being fixed to the inner cylinder, a tangential direction is penetrated to a position in the inner cylinder that substantially opposes the inner-end fixing portion of the band-shaped electric wire. A guide groove (8) was formed, and the inner end of the strip-shaped electric wire was fixed to the inner cylinder through this guide hole.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transmission device used for transmitting and receiving an electric signal between a fixed body and a rotating body having a finite number of rotations, such as a steering device for a vehicle equipped with an airbag.

[0002]

[Prior art]

 Conventionally, the structure disclosed in FIG. 4 to FIG. 6 is known as a transmission device that transmits and receives an electric signal between the steering wheel side (rotating body) and the vehicle body side (fixed body) of a vehicle. This device comprises a spirally wound strip-shaped electric wire (6), a first housing (2) and a second housing (4) for housing the same.

The first housing (2) is composed of a lower case (12) having an L-shaped cross section and having an outer cylinder (1) provided vertically, and a top plate (13) fitted in the lower case. On the other hand, the second housing (4) is a tubular body whose outer circumference forms the inner cylinder (3), and the upper and lower ends of the outer peripheral edge of the second housing (4) are the inner peripheral edge of the lower case (12) and the top plate (13) ( By being guided by 14) and (15), they are assembled so as to be able to rotate concentrically with respect to the second housing, and a ring shape is formed between the outer cylinder (1) and the inner cylinder (3). It forms a space (5). The first housing (2) is fixed to a fixed shaft on the vehicle body side of the vehicle, and the handle shaft is inserted and fixed in the second housing (3). Only the rotation is possible.

(6) is a spirally wound strip-shaped electric wire, the inner end of which is fixed to the electric wire connection portion (10) of the inner cylinder (3), while the outer end of which is the outer cylinder (3). It is fixed to the electric wire connecting portion (11) of 1) and is electrically connected to, for example, an airbag device or the like by lead wires (not shown). The band-shaped electric wire (6) can be tightened or loosened by the rotation of the inner cylinder (3). That is, the inner cylinder (3) and the outer cylinder (1) can be relatively rotated within a range where the band-shaped electric wire (6) can be tightened and loosened.

By the way, in this transmission device, as shown in FIG. 5, when the inner cylinder (3) is rotated in a direction in which the strip-shaped electric wire (6) is loosened (to the right in the figure), the rotation angle is changed. When it is near the limit, the vicinity of the inner end of the strip-shaped electric wire (6) may be inverted and bent (20) in an S shape. If this phenomenon occurs once, it tends to become a habit, and if it repeats, there is a problem that the strip-shaped electric wire (6) is disconnected due to fatigue.

As a method for solving the above problems, for example, there is a structure disclosed in Japanese Utility Model Publication No. 3-32076. This is because even if the elastic wire tongue whose base is fixed to the inner tubular part runs along the outer surface side of the strip-shaped wire extending from the inner tubular part, even if the rotation in the direction in which the strip-shaped electrical wire winds up is near the limit. The elastic tongue suppresses the deformation of the strip-shaped electric wire near the inner cylindrical portion, and prevents the wire from being inverted and bent.

[0007]

[Problems to be solved by the device]

 In the steering transmission device using the elastic tongue described above, it is necessary to assemble the elastic tongue along the path of the strip-shaped electric wire during assembly, which is troublesome to assemble and the number of parts is increased, resulting in a low product cost. There is a problem of rising.

[0008]

[Means for Solving the Problems]

 The present invention is characterized in that the shape of the inner cylinder is devised so that the strip-shaped electric wire does not reversely bend without using a separate member such as the elastic tongue. That is, the first aspect of the present invention is to provide a first housing (2) having an outer cylinder (1) and a second housing (4) having an inner cylinder (3) with an outer cylinder (1) and an inner cylinder. The ring-shaped space (5) is held between the ring-shaped space (5) and the ring-shaped space (5) so that the ring-shaped space (5) is concentrically rotatable, and the ring-shaped space (5) has an inner end of a spirally-shaped conductive wire (6). In a vehicle steering transmission device in which a portion is fixed to the inner cylinder (3) and the outer end of the strip-shaped electric wire (6) is fixed to the outer cylinder (1), the strip shape of the inner cylinder (3) A guide groove (8) penetrating in a tangential direction is formed at a position substantially facing the inner end fixing portion of the electric wire (6), and an inner tube (3) of the inner end portion of the strip-shaped electric wire (6) is formed through the guide groove (8). It is a transmission device for a steering of a vehicle, characterized in that it is fixed to.

The second aspect of the present invention is that the guide groove (8) is larger than the curved surface of the outer periphery of the inner cylinder by leaving a flat elliptical guide portion (7) on the outer periphery of the inner cylinder and providing a narrow gap inside thereof. A transmission device for a vehicle steering, characterized in that both side openings formed by providing a guide surface (9) having a radius of curvature are slightly wider than the center.

[0010]

[Action]

 When the strip-shaped wire is unwound and reaches the final stage, the strip-shaped wire is wound around the outer cylinder side due to the existence of a tangential guide groove that is provided in the tangential direction at a position that almost faces the inner end fixing part. As shown in Fig. 1, three circular arcs are formed between the inner peripheral surface and the inner cylinder. The three circular arcs cause the bending of the strip-shaped electric wire based on the rotational force in the winding loosening direction of the inner cylinder. Since the force is dispersed and absorbed, the stress against reversal bending of the strip-shaped electric wire increases, and it becomes difficult for the reversal bending to occur.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. The parts corresponding to those in FIGS. 4 to 6 are designated by the same reference numerals. As shown in FIG. 1, the characteristic of this transmission device is that the strip-shaped electric wire is prevented from being inverted and bent without using a separate member such as an elastic tongue. Specifically, the inner cylinder (3) A guide groove (8) through which the strip-shaped electric wire (6) passes is provided in the. The guide groove (8) has a flat elliptical guide part (7) at a position substantially opposite to the installation position of the wire connecting part (10) of the inner end fixing part of the strip-shaped wire (6) in the inner cylinder (3). However, it is formed by providing a narrow space inside it and providing a guide surface (9) with a radius of curvature larger than the curved surface of the outer circumference of the inner cylinder, and the openings on both sides are slightly wider than the central part.

As a result, when the inner wire (3) further rotates in the loosening direction of the strip-shaped electric wire (6) (clockwise in the figure), as shown in FIG. ), The strip-shaped electric wires near both sides of the strip-shaped electric wire will already be unwound and will come into contact with the inner peripheral portion of the strip-shaped electric wire that is in close contact with the circumferential portion of the outer tube (1) in a slightly expanded state. . That is, since the strip-shaped electric wire (6) distributes the load due to the rotation of the inner cylinder at three locations between the inner cylinder (3) and the outer cylinder (1), the strength against reverse bending is improved.

The guide groove (8) is not limited to the shape shown in the drawing, but is provided so as to penetrate through the thickness of the inner cylinder (3) in the tangential direction, and both opening edges are rounded (rounded). When the strip-shaped electric wire (6) is contacted and slid, it may be scratched, or the strip-shaped electric wire (6) may be wound so as not to be angular.

[0014]

[Effect of device]

 In the present invention, the strength against the reverse bending of the strip-shaped electric wire against over-rotation can be improved by simply changing the structure of the inner cylinder without using a separate member. Therefore, the disconnection of the band-shaped electric wire is eliminated and the reliability of the transmission device is improved. Further, since no separate parts are required, there is an effect that the assembly can be facilitated.

[Brief description of drawings]

FIG. 1 is an internal plan view showing a state in which the transmission device of the present invention is loosely wound.

FIG. 2 is an internal plan view showing a state in which the transmission device according to the present invention is tightly wound.

3 is a sectional view taken along line AA of FIG.

FIG. 4 is an internal plan view showing a conventional transmission device.

FIG. 5 is an internal plan view showing a bent state of a strip-shaped electric wire in a conventional transmission device.

6 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Outer cylinder 2 ... 1st housing 3 ... Inner cylinder 4 ... 2nd housing 5 ... Ring-shaped space 6 ... Band-shaped electric wire 7 ... Guide part 8 ...・ Guide groove 9 ・ ・ ・ Guide surface

Claims (2)

[Scope of utility model registration request] 1. A first housing (2) having an outer cylinder (1) and a second housing (4) having an inner cylinder (3).
And the outer cylinder (1) and the inner cylinder (3) are rotatably and concentrically combined with each other while maintaining a ring-shaped space (5), and the ring-shaped space (5) is spirally formed. Transmission device for vehicle steering, in which the inner end of the conductive strip-shaped electric wire (6) is fixed to the inner cylinder (3) and the outer end of the strip-shaped electric wire (6) is fixed to the outer cylinder (1). In the inner cylinder (3), a guide groove (8) penetrating in a tangential direction is formed at a position substantially facing the inner end fixing portion of the strip-shaped electric wire (6), and the strip-shaped electric wire (6) is passed through the guide groove (8). The inner end of the inner cylinder (3)
A transmission device for a vehicle steering, which is fixed to a vehicle. 2. A guide face (8) having a larger radius of curvature than the curved surface of the outer periphery of the inner cylinder by leaving a flat elliptical guide portion (7) on the outer peripheral portion of the inner cylinder and providing a narrow gap inside thereof. 9)
The transmission device for a steering of a vehicle according to claim 1, wherein the opening portions on both sides formed by providing the opening are slightly wider than the center portion.