JPH0533969Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a rotational direction detection device for detecting one direction of rotation in a device that rotates relative to each other.

[Conventional technology]

Conventionally, this type of rotational direction detection device includes, for example, the technique disclosed in Japanese Utility Model Application Laid-Open No. 59-56137.
This detects the direction of rotation on the rotation side by sliding contact between a plurality of fixed contact surfaces arranged at a predetermined angle on a base on the fixed side and a movable contact placed opposite on the rotation side.

[Problem that the invention attempts to solve]

In the conventional technology as described above, the rotational direction detection device itself is placed separately from other automobile parts devices, etc., so a dedicated space is required, and the rotational direction detection device as a whole becomes large. There's a problem.

Particularly, when the rotational direction detection device is used in, for example, an automatic return device for a turn signal for an automobile, it is difficult to secure space because it is installed in a narrow place such as the lower part of a steering wheel.

[Means for solving problems]

The present invention was devised in view of the above problems, and includes a fixed plate, a rotary plate that is arranged concentrically with the fixed plate and rotates with respect to the fixed plate, and a combination of the fixed plate and the rotary plate. comprising a transmission member that transmits a signal between them, and a detection member that detects the rotation direction of the rotary disk, the transmission member and the detection member being arranged on the same surface to constitute a rotation direction detection device, Solve the above problems.

[Effect]

According to the above configuration, the signal transmission member between the two and the detection member that detects the rotation direction can be arranged in the same space.

Therefore, a dedicated space for arranging only the detection member is not required, resulting in miniaturization.

〔Example〕

As a preferred embodiment of the present invention, an example of an automatic return device for an automobile turn signal will be described in detail with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a rotary disk fixed to the lower surface of a steering handle (not shown), and reference numeral 2 denotes a stationary disk fixedly arranged opposite to the rotary disk 1. 3 is a base fixed to fixed plate 2;
A drive circuit 4, which will be described later, is mounted on the back surface of the substrate 3. Thus, the rotating disk 1, the stationary disk 2, and the base 3 are arranged concentrically passing through a steering shaft (not shown).

On the surface of the base 3 facing the rotary disk 1, there are two facing horn switches 17 for supplying power to a horn switch 17, which will be described later, and is provided on the steering handle.
two arcuate conductive horn contact rings 5;
An annular conductive ground contact ring 6 for grounding the horn switch 17 is fixed to the inside and concentrically thereof. In addition, in the left and right end gaps of the arcuate conductive horn contact ring 5, in order to detect the rotational direction of the rotary disk 1, a pair of three detection contacts 7a to 7f each made of a conductive plate material are provided. It is arranged in series on the same radius as the arcuate conductive horn contact ring 5. 3 detection contacts 7 each on the left and right
For a to 7f, the array pitch P is set at equal intervals.

On the other hand, on the lower surface of the rotating disk 1, a horn contact 8 is provided for the arc-shaped conductive horn contact ring 5,
A ground contact 9 is provided for the annular conductive ground contact ring 6, and a detection contact 10 is provided for each of the detection contacts 7a to 7f arranged on the left and right sides.
11 are arranged facing each other so as to be in sliding contact with each contact. The detection contacts 11 have three contact portions, and their first and second arrangement pitches P ₁ and P ₂ and the arrangement pitch P of the detection contacts 7a to 7f have the following relationship. As shown in FIG. 2, the pitch P ₁ of each detection contact 10 and 11 on the rightward R ₀ rotation side is larger than the other pitch P ₂ . Further, when the first detection contact 10 rotates from the neutral position N ₀ to the R ₀ direction, first the detection contacts 7a and 7c are electrically connected, and then the detection contacts 7a, 7b, and 7c are electrically connected, Finally, conduction is established between the detection contacts 7a and 7b, and when the first detection contact 10 rotates backward in the _L0 direction, each of the first and second array pitch P ₁ and
P ₂ is set. For example, the arrangement pitch relationship is approximately set to P≦P ₂ <P ₁ . Further, the second detection contact 11 is also set in the same manner. The horn contact 8 has two contact portions, and the arrangement pitch thereof is set to be slightly larger than the arrangement pitch P ₃ of the arc-shaped conductive horn contact ring 5.

The arrangement pitch P ₃ of the arcuate conductive horn contact ring 5 is such that the arcuate conductive horn contact ring 5 and the detection contacts 7a to 7f cannot be electrically connected by the detection contacts 10 and 11. Set.

FIG. 3 shows detection contacts 7a to 7 having the above configuration.
FIG. 2 is an electrical circuit diagram configuring an automatic return device for an automobile turn signal having a direction indicator f.

Reference numeral 12 denotes a rotating conduction section shown in FIGS. 1 and 2, which includes a circular conductive horn contact ring 5, a circular conductive earth contact ring 6, a horn contact 8, and a ground contact 9. 13, and a detection conduction section 14 consisting of detection contacts 7a to 7f and detection contacts 10 and 11.

The horn conduction section 13 constitutes a transmission member, and the detection conduction section 14 constitutes a detection member.

The positive terminal of the DC power supply 15 is connected to the coil 1 of the relay 16.
6a, an arc-shaped conductive horn contact ring 5 is connected to a horn operating circuit for grounding via a horn contact 8, a horn switch 17, a ground contact 9, and a circular conductive ground contact 6. Further, the horn 18 is connected to the positive pole of the DC power supply 15 via the normally open contact 16b of the relay 16.

Reference numeral 19 denotes a direction indicator switch, and by operating the direction indicator switch 19 to the right turn direction position R or left turn direction position L, fixed contacts 19a, 19b are connected to the corresponding direction indicator light 20 or 21, respectively. and flasher unit 22
It is composed of a first movable contact 19c connected to the first movable contact 19c, a second movable contact 19d interlocked with the first movable contact 19c, and fixed contacts 19e and 19f that are switched on and off by the second movable contact 19d.

Reference numeral 23 denotes a solenoid that automatically returns the direction indicator switch 19 from the right-turn direction position R or left-turn direction position L, which is the operating direction, to the neutral position N.

In the detection conductive portion 14, the detection contact 7a
is a fixed contact 19e of the direction indicator switch 19;
Similarly, the detection contact 7d is connected to the fixed contact 1
The detection contacts 7b and 7e are connected to the reverse current prevention diode _D1 , the solenoid 23, and the second transistor of the drive circuit 4.
The detection contacts _7c and 7f are connected to the ground through the reverse current prevention diode _D2 .
4. The input terminal 4a of the driver circuit 4 is connected thereto via

In the drive circuit 4, the input terminal 4a is grounded via a Zener diode Dz for setting a constant voltage, a resistor _R1 for setting a charging time constant, and a capacitor C. The first NPN transistor T ₁ has a base connected to the connection point between the resistor R ₁ and the capacitor C and the resistor R ₂
and the collector connects to input terminal 4 through resistor ₃ .
It is connected to a. NPN type transistor _T2
is the base of the first transistor through the resistor _R4
It is connected to the collector of T ₁ and also to resistor R ₅ .

Next, the operation of the above structure will be explained. In the horn operating circuit shown in FIG. 3, the horn conducting portion 13 is always in a conductive state, and the horn 18 sounds every time the horn switch 17 is turned on.

Now, for example, when the direction indicator switch 19 is operated to the right turn direction position R in order to drive the automobile to the right, the right direction indicator light 20 flashes due to the operation of the flasher unit 22. Subsequently, when the steering wheel of the automobile is rotated to the right, the rotary disk 1 attached to the lower surface of the steering wheel is also rotated together, so that the detection contacts 10 and 11 are also rotated together.

Therefore _, as shown in the time chart in which the horizontal axis is time _t in FIG. 7c are electrically connected, and then 7a, 7b, and 7c are electrically electrically connected.

In the drive circuit 4, the first transistor _T1 is turned on after a predetermined delay time t1 (sec) based on the charging time constant of the capacitor c when the detection contacts 7a and 7c are turned on. At this point, the second transistor _T2 is turned OFF. Therefore, even if the detection contacts 7a and 7b are electrically connected, the solenoid 23 cannot be turned on. Therefore, right direction indicator light 2
0 continues blinking operation.

Next, when the right turn of the automobile is completed and the steering wheel is returned to the left direction _L0 and rotated, the conduction order of the detection contacts 7a, 7b and 7c is reversed. Thus, the solenoid 23 is turned ON only during the delay time t1 (sec), and the movable contacts 19c and 19d of the direction indicator switch 19 are automatically returned to the neutral position N shown in FIG. 3.

The right direction indicator light 20 is then turned off.

Also, move the direction indicator switch 19 to the left position L.
Even when the left direction indicator light 21 is operated to the right direction position R, the left direction indicator light 21 turns on and off in the same manner as when the operation is performed to the right direction position R described above.

In the above embodiment, the number of detection contacts 10 and 11 is not limited to two, and only one may be provided.

In addition, a circular conductive earth contact ring 6
is not an essential configuration, and can be omitted, for example, in a configuration in which the horn switch 17 is grounded via the steering shaft.

Further, in the above embodiment, the detection contacts 7a to 7f are arranged in a pair of three each and arranged in series on the same radius as the arcuate conductive horn contact ring 5, but a plurality of detection contacts are arranged in a pair. In addition to the above, it is also possible to arrange them in parallel. In that case, the contact portions of the detection contacts 10 and 11 may be arranged in parallel in the movement radial direction in accordance with the arrangement of the detection contacts 7a to 7f.

Furthermore, the configuration of the detection conduction section 14 consisting of the detection contacts 7a to 7f and the detection contacts 10 and 11 is as follows.
For example, the detection contacts 7a to 7f may be made of a light-reflective material, a photointerrupter or the like may be used in place of the detection contacts 10 and 11, and the input/output of optical signals may be used. It may also be detected by Alternatively, a combination of a magnet and a Hall IC may be used. Furthermore, the signal transmission between the rotary disk 1 and the fixed disk 2 is not limited to the horn 18 activation signal, and the signal form is not limited to electrical signals, but may also be optical signals, for example.

Furthermore, although the above embodiment has been described as an automatic return device for an automobile turn signal, the present invention is not limited to this.

[Effect of idea]

As detailed above, according to the present invention, the transmission member that transmits signals between the fixed plate and the rotary plate and the detection member that detects the rotational direction of the rotary plate can be arranged in the same space. , each does not require its own space, making it compact.

[Brief explanation of drawings]

1 to 4 show an embodiment of the rotational direction detection device according to the present invention, and FIG. 1 is an exploded perspective view;
Figure 2 is an assembled cross-sectional view in the direction of the arrow line A-A in Figure 1, Figure 3 is an electrical circuit diagram of an automatic return device for an automobile turn signal using the configuration shown in Figure 1, and Figure 4 is a It is a time chart explaining the operation of the figure. 1...Rotary plate, 2...Fixed plate, 3...Base, 5
...Arc-shaped conductive horn contact ring, 7a
~7f...Detection contact, 8...Horn contact, 10, 11...Detection contact.

Claims (1)

[Claims for Utility Model Registration] A fixed platen, a rotary plate arranged concentrically with the fixed platen and rotating with respect to the fixed platen, and a transmission for transmitting signals between the fixed platen and the rotary platen. A rotational direction detection device comprising: a member; and a detection member for detecting a rotational direction of the rotary disk, wherein the transmission member and the detection member are arranged on the same surface.