JP2002372404A - Rotational sensor and neutral fixing pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotational sensor and neutral fixing pin capable of holding a first and a second rotor in neutral state even with the work of torque. SOLUTION: The rotational sensor 1 and the neutral fixing pin 8 are provided with the first rotor 2, a fixing core 3 having an exiting coil, the second rotor 4 having a main body 4a and a plurality of nonmagnetic conductor layers 4b, and covers 5 and 6 fixed to a fixing core. The rotational sensor 1 is inserted in through holes 5a, 6a, 2c and 4d formed in the first and the second rotors 2 and 4, and hooked to a cover 5. The neutral fixing pin 8 having an insertion part 8a and hooking part 8e for holding the first and the second rotors 2 and 4 in neutral state against the rotational direction of a fixing core 3 are provided with.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rotation sensor and a neutral fixing pin.

[0002]

2. Description of the Related Art A rotation sensor for detecting a rotation angle or a relative rotation angle of a shaft in a non-contact manner, for example, in a motor vehicle in which two relatively rotating shafts are connected via a torsion bar. 2. Description of the Related Art There is known a rotation sensor that detects a rotation torque of a steering shaft and uses the torque for smooth electronic control of a steering device.

In this type of rotation sensor, a first rotor is attached to a first shaft connected to a torsion bar, and a second rotor is attached to a second shaft.
First and second rotors are rotatably arranged inside a fixed core having a coil, and relative rotation of the first and second shafts is detected by a change in inductance of the coil. Is to detect the rotational torque acting between the shaft and the shaft.

At this time, it is necessary to ship the rotation sensor at a position where the rotation in the left-right direction is in a neutral state based on the above detection principle, and to assemble the rotation sensor in a steering device or the like while maintaining the neutral state. For this reason, in the rotation sensor, a neutral fixing pin for maintaining a neutral state is attached in a cantilever state across the first rotor and the second rotor. For this reason, when a torque acts on the first rotor and the second rotor, the rotation sensor may shift the neutral state.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a rotation sensor and a neutral fixing member capable of holding a first rotor and a second rotor in a neutral state even when a torque is applied. The purpose is to provide pins.

[0006]

In order to achieve the above object, a rotation sensor according to the present invention has a plurality of non-magnetic conductors arranged at predetermined intervals in a circumferential direction, and is attached to a first shaft. A first rotor, an excitation coil, a fixed core fixed to a fixed member at a radial distance from the first rotor, a main body formed into a cylindrical shape from an insulating magnetic material, A plurality of non-magnetic conductor layers disposed on the main body at predetermined intervals in a circumferential direction at intervals corresponding to the non-magnetic conductors; and a plurality of non-magnetic conductor layers arranged at predetermined intervals in a radial direction with respect to the first rotor. A second rotor attached to a second shaft that rotates relative to the first shaft, and a cover attached to the fixed core.
A rotation sensor that detects a rotation angle or a relative rotation angle of the two shafts based on an inductance of the exciting coil that fluctuates due to a relative rotation of the first and second rotors; A neutral fixing pin is provided that is inserted into an insertion hole formed in the rotor, is locked to the cover, and holds the first and second rotors in a rotationally neutral state with respect to the fixed core. It was a configuration.

According to another aspect of the present invention, there is provided a neutral fixing pin, comprising:
The configuration includes an insertion portion inserted into insertion holes formed in the first rotor and the second rotor, and a locking portion locked to the cover. Preferably, the insertion portion is molded flat.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a rotation sensor and a neutral fixing pin according to the present invention will be described below in detail with reference to FIGS. The rotation sensor 1 includes a first rotor 2, a fixed core 3, a second rotor 4, an upper cover 5, and a lower cover 6. For example, the first rotor 2 is mounted on a steering wheel connected to a torsion bar on a steering wheel side. Second on the side
The rotors 4 are respectively mounted.

The first rotor 2 is formed of a nonmagnetic conductive metal such as aluminum, aluminum alloy, copper, or copper alloy, and has a plurality of comb-shaped teeth 2b extending downward from the upper flange 2a at predetermined intervals in the circumferential direction. It is formed with. In the upper flange 2a, an elongated insertion hole 2c through which an insertion portion 8a of a neutral fixing pin 8 described later is inserted is formed between the teeth 2b, 2b at positions along the plurality of comb-shaped teeth 2b. ing.

The fixed core 3 includes a core main body 3a made of an insulating magnetic material such as ferrite, an exciting coil 3b housed in the core main body 3a, and a metal shielding case (hereinafter simply referred to as a "case") housing the core main body 3a. 3c). The second rotor 4 is made of Ni-Z having electrical insulation.
Ni-based, Mn-Zn-based, Mg-Zn-based ferrite sintered bodies, nylon, polypropylene (PP), polyphenylene sulfide (PPS), ABS synthetic resin, etc. -Zn and M
A soft magnetic material powder composed of n-Zn based ferrite is provided on the outer surface of a main body 4a formed in a cylindrical shape with an insulating magnetic material in which the soft magnetic material is mixed in a volume of 10 to 70% by volume. A non-magnetic conductor layer 4b made of aluminum, copper, or the like is arranged at a central angle of 30 ° in the circumferential direction, and a lower flange 4c extending radially outward is provided at a lower portion of the main body. However, the plurality of teeth 2b and the nonmagnetic conductor layer 4b are
If they are provided at regular intervals, they need not be provided at intervals of a central angle of 30 °. The lower flange 4c is inserted into the insertion hole 2 of the upper flange 2a.
An insertion hole 4d is formed at a position corresponding to c.

As shown in FIG. 2, the upper cover 5 and the lower cover 6 are ring-shaped covers mounted on the upper and lower sides of the fixed core 3, and are provided at positions corresponding to the insertion holes 2c and 4d.
a, 6a are formed. The upper cover 5 has a locking recess 5b formed on the outer edge. At this time, the insertion holes 2c, 4
When the rotation sensor 1 is assembled, the d and the insertion holes 5a and 6a may be formed so as to coincide with the vertical direction as shown in FIG. Needless to say.

The rotation sensor 1 configured as described above has:
After the teeth 2b are arranged between the fixed core 3 and the second rotor 4 and the first rotor 2 is assembled, the upper cover 5 and the lower cover 6 are attached using the outer edge of the fixed core 3, as shown in FIG. As described above, the neutral fixing pin 8 is inserted into the insertion hole 5a from above to assemble. Here, the neutral fixing pin 8 is, for example, 1
The pin is bent and molded, and as shown in FIGS. 1 to 3, the insertion portion 8a, the first grip portion 8b, the elasticity imparting portion 8c,
It has a second grip portion 8d and a locking portion 8e. Insertion part 8
“a” is a portion formed at one end of the neutral fixing pin 8 and is formed into a flat shape and inserted into the insertion holes 2c to 6a. The first grip portion 8b is provided continuously with the insertion portion 8a, and is formed in a substantially U-shaped curve. The elasticity imparting portion 8c is bent upward in an inverted U-shape and formed between the first gripping portion 8b and the second gripping portion 8d, and is formed between the first gripping portion 8b and the second gripping portion 8d. Elastic force is applied in the direction of spreading. The second grip 8d is
An engaging portion 8e which is bent at a substantially right angle is provided at an end of a portion which is bent at a substantially right angle connected to the elasticity applying portion 8c. As shown in FIGS. 3 and 4A, the locking portion 8e is locked in the concave portion 5b of the upper cover 5 by the elastic force applied from the elasticity providing portion 8c, and the insertion holes 2c to 2c of the neutral fixing pin 8 are provided. 6a is restricted from being pulled out.

In the rotation sensor 1 thus assembled, the insertion portion 8a is inserted into the insertion holes 2c to 6a, and the neutral fixing pin 8 is connected to the upper cover 5, the second rotor 4, and the lower cover 6
It is attached in the state of a doubly supported beam. For this reason, in the rotation sensor 1, even if torque acts on the first rotor 2 or the second rotor 4, the neutral fixing pin 8 restricts the rotation of the first and second rotors 2 and 4, and the neutral state shifts. Nothing.

In the rotation sensor 1, the locking portion 8e is locked in the concave portion 5b of the upper cover 5 by the elastic force applied from the elasticity applying portion 8c. 8 is not pulled out, has an excellent function of maintaining a neutral state, and has high reliability. Further, since the insertion portion 8a of the neutral fixing pin 8 is formed to be flat, the fixing core 3 of the rotation sensor 1 and the main body 4 of the second rotor 4 are formed.
a can be inserted with good workability even if the gap is very narrow.

On the other hand, when the neutral fixing pin 8 is detached from the rotation sensor 1 such as when the rotation sensor 1 is used, as shown in FIG. 3, the first gripping portion 8b and the second gripping portion 8d are held by fingers from both sides. Pinch. Then, the first gripper 8b and the second gripper 8
d bends against the elastic force from the elasticity imparting portion 8c, and the width between the gripping portions 8b and 8d is reduced. Accordingly, FIG.
As shown in (b), the locking portion 8e is
Remove from b. Therefore, when the gripping portions 8b and 8d are gripped and pulled upward as indicated by arrows in the drawing, the insertion portion 8a is pulled out from the insertion holes 2c to 6a, and the neutral fixing pin 8 is easily removed from the rotation sensor 1. Can be removed.

The rotation sensor according to the present invention determines the relative rotation angle, rotation angle, and torque between rotating shafts that rotate with each other, such as a robot arm, in addition to the steering shaft of the automobile described in the above embodiment. Anything can be used.

[0017]

According to the first to third aspects of the present invention, a rotation sensor and a neutral fixing pin capable of holding the first rotor and the second rotor in a neutral state even when a torque acts. Can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a rotation sensor and a neutral fixing pin according to an embodiment of the present invention, which is shown together with a neutral fixing pin.

FIG. 2 is a sectional view showing a state where a neutral fixing pin is inserted into the rotation sensor of FIG. 1;

FIG. 3 is a perspective view showing a main part in a state where a neutral fixing pin is removed from the rotation sensor of FIG. 1;

FIG. 4 is a perspective view showing a locking portion of a neutral fixing pin in the rotation sensor of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation sensor 2 1st rotor 2b Teeth (nonmagnetic conductor) 2c Insertion hole 3 Fixed core 3b Excitation coil 4 2nd rotor 4a Main body 4b Nonmagnetic conductor layer 4d Insertion hole 5 Upper cover 5a Insertion hole 6 Lower cover 6a Insertion hole 8 Neutral fixing pin 8a Insertion section 8b First grip section 8c Elasticity imparting section 8d Second grip section 8e Lock section

Continued on the front page (72) Inventor Masahiro Hasegawa 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd. (72) Inventor Fumihiko Abe 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Industry Co., Ltd. (72) Inventor Kim Toji 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Takeshi Taka ▼ 2-6-1 Marunouchi, Chiyoda-ku, Tokyo No. Furukawa Electric Co., Ltd. (72) Inventor Kengo Tanaka 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Kazuhiko Matsuzaki 2-6-1 Marunouchi, Chiyoda-ku, Tokyo No. F-term in Furukawa Electric Co., Ltd. (reference) 2F063 AA35 AA36 BA08 CA22 DA05 DD03 EA03 GA08 KA01 ZA01 2F077 CC02 CC08 FF31 VV02 VV21 3D033 CA28 DB05

Claims (3)

[Claims] A first rotor having a plurality of non-magnetic conductors arranged at predetermined intervals in a circumferential direction, a first rotor attached to a first shaft, and an exciting coil; A fixed core fixed to the fixing member at intervals in the radial direction, a main body formed into a cylindrical shape from an insulating magnetic material, and a predetermined interval in the circumferential direction at an interval corresponding to the plurality of nonmagnetic conductors; A plurality of nonmagnetic conductor layers disposed on the main body, the plurality of nonmagnetic conductor layers being disposed at a predetermined radial distance from the first rotor,
A second rotor attached to a second shaft that rotates relative to the first shaft; and a cover attached to the fixed core, wherein the excitation varies with the relative rotation of the first and second rotors. In a rotation sensor for detecting a rotation angle or a relative rotation angle of the two shafts based on an inductance of a coil, the rotation sensor is inserted into insertion holes formed in the cover, the first and second rotors, and is inserted into the cover. A rotation sensor provided with a neutral fixed pin that is locked and holds the first and second rotors in a rotationally neutral state with respect to the fixed core. 2. The rotation sensor according to claim 1, wherein said cover, said first rotor and said second rotor are inserted through insertion holes formed in said second rotor, and said latch is locked by said cover. And a neutral fixing pin. 3. The neutral fixing pin according to claim 2, wherein said insertion portion is formed flat.