JP2001174472A - Rotation velocity detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate mounting to a gear and to improve the mounting accuracy by circularly arranging six sensors to one holding body. SOLUTION: In this rotation velocity detector, a plurality of sensors 3a-3f are arranged along the circular surface 4a of a holding body 4, and it is possible to set the mounting location of each of the sensors 3a-3f to a gear 1 with high accuracy only by mounting the holding body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational speed detector, and more particularly to a novel rotational speed detector in which a plurality of sensors are arranged in an arc on a single holder to improve positioning accuracy and simplify the structure. About improvement.

[0002]

2. Description of the Related Art Hitherto, as this kind of rotational speed detector that has been used, for example, the configuration shown in FIGS. 9 to 14 has been adopted. That is, what is indicated by reference numeral 1 in FIG. 9 is a gear that is provided on the rotating shaft 2 of a train, an aircraft, or the like and is made of a magnetic material. To 3 f are provided via the holding body 4. Each of the sensors 3a to 3f has a set of lead wires 5 bundled therein, and each of the sensors 3a to 3f is incorporated in a shield type output cable 6 and led to the outside.

As shown in detail in FIG. 10, the sensors 3a to 3f are fixed to the holder 4 with set screws 6A, and are detachably connected between the lead wire 5 and the sensors 3a to 3f by a connector 7. It is connected. Each of the sensors 3a
11 to 12, a sensor mounting screw 10 is formed on the outer periphery of each of the sensors 3a to 3f, and a connector pin 7a is formed at an end of the connector 7. In FIG. 14, the single-phase sensor 3a is mounted on the mounting member 4a, and the gap G between the tip 3aA of the sensor 3a and the outer periphery of the gear 1 is adjusted by changing the position of the set screw 6A. .

[0004]

Since the conventional rotational speed detector is configured as described above, there are the following problems. That is, since a plurality of independent sensors must be provided at predetermined positions along the outer periphery of the gear, it is necessary to adjust the gap for all the sensors, and a great deal of labor is required for the mounting operation. Further, the lead wires of each sensor have to be built in a plurality of cables and attached, which is extremely difficult in a narrow space such as a train or an aircraft.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in particular, by arranging a plurality of sensors in an arc on a single holder, it is possible to improve the positioning accuracy and simplify the structure. It is an object of the present invention to provide a rotational speed detector that obtains the following.

[0006]

SUMMARY OF THE INVENTION A rotational speed detector according to the present invention comprises a holding member provided near a rotating gear and a sensor provided on the holding member. In the rotation speed detector configured to obtain a rotation speed signal from the above, the holder has only one piece and has an arcuate surface formed over a predetermined angular range of the outer periphery of the gear, and along the arcuate surface A plurality of the sensors are arranged, and each of the sensors includes a total of six and forms six phases, and twelve lead wires of each of the sensors are provided on the holding body. One
In this configuration, each sensor is of a non-powered type and has a phase A and a phase B different from each other.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a rotational speed detector according to the present invention will be described below with reference to the drawings. The same or equivalent parts as those in the conventional example will be described using the same reference numerals. In FIG. 1, reference numeral 4 denotes only one holder having an arc-shaped surface 4a formed along the outer peripheral surface of the gear 1 provided on the rotary shaft 2 and formed entirely in an arc shape. The surface 4a is formed over a predetermined angle range of the gear 1 (for example, about 120 degrees in FIG. 1).

The holder 4 is fixed to a mounting member (not shown) such as a train or an aircraft via a mounting hole 4b.
Shielded cable 6 via cable gland 10
Is provided. The holder 4 has the arc-shaped surface 4a
The three sensors 3a to 3f are provided at a predetermined interval along the axis, and the tips 11 of the sensors 3a to 3f protrude inward from the arc-shaped surface 4a and are extremely close to the outer peripheral surface of the gear 1. , A six-phase sensor 12 is constituted.

Each pair of lead wires 5 connected to each of the sensors 3a to 3f is bundled at a cable connection portion 20 and is built in the cable 6 via a cable gland 6a.
The cable 6 is led to the outside in a state where the twelve lead wires 5 are contained therein. The cable connection portion 20 is filled and fixed with an epoxy resin 30.

Each of the sensors 3a to 3f is composed of, for example, A, B, A, B, B, and B phases as shown in FIG.
The sine wave is output to the B-phase rotation speed signal 40.
It goes without saying that the combination of the A phase, the B phase, the A bar phase, and the B bar phase can be freely determined by the combination of the sensor installation position and the coil winding direction.

Each of the sensors 3a to 3f is configured as shown in FIGS. 6 to 8, for example. That is, a bobbin 53 having a permanent magnet 51 and a pole piece 52 is provided in a cup-shaped case 50, and a tip 52 a of the pole piece 52 is connected to an opening 50 a of the case 50.
It is exposed from. A coil 5 is provided around the bobbin 53.
4 and a lead wire 5 connected to the coil 54.
Are provided on terminal pins 55 implanted in the bobbin 53. Accordingly, the rotation of the gear 1 causes each sensor 3 to operate according to the same principle as that of the generator (that is, without power supply).
The rotation speed signal 40 shown in FIG. 5 is output from the coils 54a to 3f. The number of sensors is not limited to six,
Optional. Further, a configuration having a power supply can also be used.

[0012]

The rotational speed detector according to the present invention is configured as described above, so that the following effects can be obtained. That is, since a plurality of sensors are arranged along the arc-shaped surface of one holder, the attachment of each sensor is facilitated, and the accuracy of attachment to the gear is improved. Further, at the time of sensor replacement, each sensor can be replaced at the same time, so that maintainability is greatly improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a rotation speed detector according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a configuration diagram showing the inside of FIG. 1;

FIG. 4 is a connection diagram of FIG. 1;

FIG. 5 is a waveform diagram of a rotation speed signal.

FIG. 6 is a plan view of the sensor of FIG. 1;

FIG. 7 is a sectional view of the sensor of FIG. 1;

FIG. 8 is a sectional view of a main part of FIG. 7;

FIG. 9 is a front view showing a conventional configuration.

FIG. 10 is a front view showing a main part of FIG. 9;

FIG. 11 is a side view showing a conventional sensor.

FIG. 12 is a right side view of FIG.

FIG. 13 is a left side view of FIG.

FIG. 14 is a diagram showing a conventional use state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gear 4 Holder 3a-3f Sensor 4a Arc surface 5 Lead wire 6 Cable 40 Rotation speed signal

Claims (3)

[Claims] A holder (4) provided near a rotating gear (1), and sensors (3a to 3f) provided on the holder (4).
The rotation of the gear (1), the sensor (3a ~
3f) In a rotation speed detector configured to obtain a rotation speed signal (40) from the rotation speed detector (40), the holding body (4) is formed of only one, and is formed in an arc shape formed over a predetermined angular range on the outer periphery of the gear (1). A rotation speed detector having a surface (4a), wherein a plurality of the sensors (3a to 3f) are arranged along the arc-shaped surface (4a). 2. Each of the sensors (3a to 3f) comprises a total of six sensors and forms six phases.
2. The rotating device according to claim 1, wherein the lead wires (5) are collectively incorporated in one cable (6) provided on the holding body (40) and are led out. 3. Speed detector. 3. The rotational speed detector according to claim 1, wherein each of the sensors is of a non-powered type and has an A phase and a B phase having different phases.