JPH0650722Y2 - Neutral position detector for rotating body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rotating body having a finite rotation angle such as a rotary connector for connecting a switch attached to a steering wheel of an automobile and electric wiring on the vehicle body side. The present invention relates to a device for detecting the neutral position of.

[Prior art]

A rotating body such as a rotating connector attached to a steering wheel of an automobile must be attached to a device by aligning a neutral point or a zero point of the rotation angle when assembling the rotating body. If the rotator has a code mark for detecting this neutral point or zero, it cannot be used for a rotator that rotates more than one revolution, and if the rotator has only a detent. Has a drawback that the neutral point cannot be detected because the rotating body is not always disassembled according to the work procedure when it is disassembled for maintenance purpose after being put on the market.
Therefore, the rotating body is required to be able to always detect its neutral point. The conventional neutral position detecting device for a rotating body is composed of a display mechanism including an intermittent gear, an eccentric gear, or an eccentric cam.

[Problems to be solved by the invention] However, the intermittent gear generates noise due to disengagement at the intermittent portion of the intermittent gear at every rotation, and the structure becomes large.
In addition, if dust or dirt enters the intermittent gear, it is not possible to ensure a smooth movement of the gear, and the durability is reduced. In addition, the eccentric gear or the eccentric cam has a drawback that it cannot smoothly rotate because it generates sliding friction. In particular, when the rotating body is a steering wheel of an automobile, if this steering wheel cannot rotate due to dust or damage to teeth, there is a risk of causing a serious accident, and it is required to avoid it.

SUMMARY OF THE INVENTION An object of the present invention is to provide a neutral position detecting device for a rotating body, which avoids the above-mentioned drawbacks, produces no sound, and can smoothly operate with a simple structure.

[Means for Solving the Problems]

In order to solve the above problems, the present invention is a device for detecting the neutral position of a rotating body rotatably supported in an outer box, wherein a roller wound around the rotating body for several turns and attached to the outer box is provided. It consists of an endless neutral position detection strip that is provided between the rotating body and the outer box so that it can be observed from the window when the rotating body is in the neutral position with respect to the outer box. A neutral position detecting device for a rotating body, which is characterized in that a body is provided.

[Action]

With this configuration, since the neutral position of the rotating body is detected by the displacement of the neutral position detecting strip, there is no occurrence of sound due to disengagement of the intermittent gear intermittently used in the prior art. Further, unlike the case of using the eccentric gear or the eccentric cam used in other conventional techniques, an extra force such as an eccentric load is not applied, so that the rotation is smoothly performed.

〔Example〕

An embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show one embodiment of a neutral position detecting device 10 for a rotating body according to the present invention. apparatus
Reference numeral 10 is for detecting the neutral position of the rotating body 14 rotatably supported in the outer box 12.

The neutral position detecting device 10 of the rotating body according to the present invention includes a rotating body 14
It is composed of an endless neutral position detecting strip 18 provided between the rotating body 14 and the outer box 12 so as to surround a roller 16 which is wound several turns around and is attached to the outer box 12. In the illustrated embodiment, the neutral position detecting strip 18 is covered by a cover 20 attached to the front end face of the outer box, but the roller 16 is visible through the transparent window 22 of the cover 20.

The neutral position detecting strip 18 is an identifier (mark) observed through the transparent window 22 when the rotating body 14 is in the neutral position with respect to the outer box 12.
24 are provided.

In the illustrated embodiment, the rotating body 14 has a grooved auxiliary guide 26 around which the neutral position detecting strip 18 is wound. Further, the neutral position detecting strip 18 is color-coded into a first color portion 18A and a second color portion 18B by applying different colors on both sides of the discriminator 24 as a boundary. In FIG. 3, reference numeral 18C is a boundary between the color-separated first and second color portions. On the other hand, the outer box 12 is also colored with the same color on both sides with the transparent window 22 as a boundary in accordance with the color portions 18A and 18B of the neutral position detecting strip 18 when the rotating body 14 is in the neutral position. It has color portions 12A and 12B with the second.

Therefore, in this device, when the rotating body 14 is not in the neutral position, either the first or the second color portion 18A, 18B of the neutral position detecting strip 18 is observed in the transparent window 22 of the cover 20,
The neutral position of the rotator 14 can be detected by rotating the rotator 14 to the side of the cover 20 having the same color portion as the colored portion 18A or 18B of the visible neutral position detecting strip 18.

On the other hand, since the prior art intermittent gear is not used to detect the neutral position of the rotating body 14 in this device, no sound is generated due to disengagement or the like at the intermittent portion of the intermittent gear. Unlike the eccentric gear or the eccentric cam used in the related art, no extra force such as an eccentric load is applied, so that the rotation is smoothly performed.

The neutral position detecting strip 14 is wound around the rotating body 14 for several turns, and has a sufficient length so that the boundary 18C cannot be seen no matter how many times the rotating body 14 rotates.
When the required number of rotations of is large, the neutral position detection strip 18 also becomes long and the number of turns also increases. When the number of turns increases, the neutral position detecting strip 18 does not slip, and the neutral position can be smoothly detected by applying sufficient tension by the roller 16. If the neutral position detecting member 18 has a slip, the neutral position detecting member 18 is a toothed string, a belt or a chain, and the roller 16 and the auxiliary guide 26 are fitted with gears, toothed pulleys or sprockets. can do. In addition, the neutral position detection line 14 is the boundary
18C may be fixed to the rotating body 14. In either case, the neutral position detecting member 18 is made of a material and dimensions that can be cut when a strong force is applied, and the neutral position detecting member 18 is normally operated.
Keep it working with little force applied to it. Further, it is more preferable that the number of rotations and the rotation angle of the rotating body 14 can be read by attaching a scale to the neutral position detecting strip 18.

[Effect of device]

According to the present invention, as described above, there is a merit that it can be manufactured inexpensively because it can operate smoothly without generation of sound and has a simple structure.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of a neutral position detecting device for a rotating body according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a front view of a neutral position detecting strip. .. 10 …… Neutral position detecting device for rotating body, 12 …… Outer box, 14 …… Rotating body, 16 …… Roller, 18 …… Neutral position detecting strip, 22 …… Transparent window, 24 …… Identifying body.

Claims (1)

[Scope of utility model registration request] 1. A device for detecting a neutral position of a rotating body rotatably supported in an outer box, wherein the rotating body is wound around the rotating body for a few turns to surround a roller attached to the outer box. And an outer box provided between the outer box and the outer box, the neutral position detecting section is provided with an identification body that is observed from the window when the rotating body is in the neutral position with respect to the outer box. A neutral position detecting device for a rotating body.