JPH0438294Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Purpose of the Invention [Field of Industrial Application] This invention relates to a signal generating device that can directly extract rotational signals from the drive shaft of an automobile.

[Conventional technology]

For example, when extracting a signal from a transmission drive shaft to a fare meter or tachometer attached to a taxi, the signal generating device usually uses a photoelectric element or reed switch, so the mechanism is large. Therefore, it was not possible to directly install it in the transmission part of an automobile, which is particularly narrow. (Utility Model Application No. 56-29467, Utility Model Application Publication No. 1983)
On the other hand, a Hall element can be considered as a relatively small signal generating device, but the Hall element has poor temperature characteristics and cannot be used particularly in high temperature ranges such as the transmission part of an automobile. Ta.

Therefore, in the past, it was necessary to extract the signal indirectly from the flexible cable installed between the drive shaft and the speedometer, but this method of cutting the flexible cable midway does not allow the signal to be extracted. This has many disadvantages, such as not only requiring a lot of effort to connect the generator, but also requiring a large number of joints for the connection.

(b) Structure of the invention [Means for solving the problem] This invention is an attempt to solve the above-mentioned conventional technical problems, and the signal generating device has one end facing the mission side and the other end facing the transmission side. A rear rotor is provided with a key that can be engaged with the drive shaft in a socket that can be connected to each cable side, and a front rotor is equipped with an engagement part that engages with the key on the cable inner. A rotating member integrally connected via a joint inner is installed, a magnet is provided in the electric signal extraction hole of the socket or the rotor, and a magnet is installed in the socket wall at the rotational position of the front rotor. The technical feature is that a resistive element is embedded.

[Effect]

With this configuration, the present invention makes the entire device compact, and at the same time connects the front and rear rotors with a joint inner, allowing for some eccentricity between the drive shaft and the cable shaft. Therefore, this device can be easily installed in a narrow mission area.

〔Example〕

Hereinafter, the structure will be described in more detail based on the embodiment shown in the drawings. 1 is made of a non-magnetic material such as aluminum, and one end is connected to the transmission side, and the other end is connected to the nut (not shown) at the end of the cable. The socket 2 is a rotary member housed in the socket, and has a rear rotor 2a projecting with a key k that can be inserted into the drive shaft, and a cable side inner (not shown) at the other end. 2) is integrally connected to a front rotor 2b provided with an engageable engagement portion 2b' via a joint inner 2c.

Reference numeral 3 designates a magnet built into the electric signal extraction hole 1a of the socket, and 4 designates a magnetoresistive element embedded in the socket wall corresponding to the rotational position of the front rotor 2b.

In this case, the front rotor 2b is made of a magnetic material such as carbon steel, and its outer circumferential surface at least at the position where the magnetic resistance element 4 is buried is cut out to have a cross-sectional shape as shown in FIGS. 2A to 2D. The shape of the front rotor 2b may be a cross shape as shown in the figure, or any other irregular shape commensurate with the desired number of signals, or
(see FIG. 3), pulses are generated by magnetic changes in the magnetoresistive element 4 that occur as the rotating member 2 rotates.

In the figure, 5 is an oil-impregnated metal sleeve that is fitted onto the rotating member 2, and 6 and 6' are the rotors 2a,
The caulking portion of the joint inner 2c in 2b, or 7 indicates a cover plate that closes the opening of the electrical signal extraction hole 1a.

Further, FIG. 4 shows another embodiment of the present device, in which the magnet 3 in the electric signal extraction hole 1a in the above embodiment is buried in the front rotor side.
Similarly to the above, pulses are generated as the rotating member 2 moves, but in this case, the front rotor 2b is required to be made of a non-magnetic material.

(c) Effects of the invention The signal generating device of the present invention with the above configuration extracts the rotational signal directly from the drive shaft, so it is less effective than the conventional device that is installed in the middle of the flexible cable. This eliminates the need for mounting and many joint members, making it possible to significantly downsize the entire device.

Furthermore, in the present device, the front and rear rotors 2a, 2b are
The eccentric error between the drive shaft and the cable shaft and other vibrations are absorbed by the joint inner 2c that connects the cable shafts.This, together with the compactness of the mechanism described above, makes it possible to accommodate narrow transmission areas. It can be easily installed, and the cable shaft can be attached to the socket in the usual way without any machining, so it can demonstrate excellent practicality in improving work efficiency and accuracy. .

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of the central part of the proposed signal generator;
2A to 2D are longitudinal cross-sectional views showing examples of cutouts on the outer peripheral surface of the front rotor, and FIG. 3 is a longitudinal cross-sectional view of the central part of the rotating member showing another embodiment of the front rotor. Furthermore, FIG. 4 is a partial sectional view showing another embodiment of the present device. In the figure, 1...socket, 2...rotating member, 3
... Magnet, 4... Magnetoresistive element.

Claims (1)

[Claims for Utility Model Registration] 1. A rear rotor that can be engaged with the drive shaft and a cable inner that can be freely engaged in a socket that can be connected at one end to the transmission side and at the other end to the cable side. A rotating member integrally connected to the front rotor via a joint inner is installed inside, and a magnetic resistance element sensitive to magnets is embedded in the socket wall at the rotational position of the front rotor. A signal generator characterized by: 2. The signal generating device according to claim 1, wherein the front rotor is a magnetic material and a magnet is provided in the electric signal extraction hole of the socket. 3. The signal generating device according to claim 1, wherein the front rotor is made of a non-magnetic material and a magnet is embedded in the rotor.