JP2001304913A - Structure of angle detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a transmission of a deflection from a shaft to be detected or a vibration of a wheel-like rotor by coupling a second rotary shaft to a first rotary shaft for supporting the rotor via a coupling. SOLUTION: A structure of an angle detector comprises the second rotary shaft (11) disposed coaxially with the first rotary shaft (4) for supporting the rotor (5), a universal coupling (30) provided between the first shaft (4) and the second shaft (11), and an oily substance (80) provided between the respective shafts (4 and 11).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle detector structure, and more particularly, to a structure in which a rotating shaft for rotating a rotor is made coaxial and biaxial, and a universal coupling is provided between the rotating shafts to thereby detect a shaft to be detected. The side displacement is absorbed by the free coupling, the length between the detected shaft and the detector is shortened, and the angle detection accuracy and reliability are improved.
The present invention relates to a novel improvement for obtaining a smooth rotation by directly joining an oily substance between the rotating shafts.

[0002]

2. Description of the Related Art As a variable reluctance type resolver of this type which has been conventionally used, the configuration of Japanese Patent Application Laid-Open No. 9-103059 shown in FIG. 4 can be mentioned.
That is, what is indicated by reference numeral 1 in FIG. 4 is a ring-shaped stator having a stator winding 2, and the outer periphery of the ring-shaped stator 1 is held by a ring-shaped case 3. Inside the annular stator 1, an annular rotor 5 held by a hollow shaft 4 is rotatably provided.

[0003]

Since the conventional resolver is configured as described above, there are the following problems. That is, the case is provided on the outer periphery of the annular stator, and the detected shaft is directly connected to the hollow shaft provided inside the annular stator. Therefore, when the detected shaft is eccentric, the hollow shaft is directly eccentric. However, there was an error in the accuracy of angle detection. Although not shown, a commercially available universal joint may be interposed between the hollow shaft and the detected shaft. In this case, since the universal joint has a long length and a large shape, the detector and the detected shaft are large. The length between the axis and the detection axis was long.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In particular, the present invention has a rotating shaft for rotating a rotor which is coaxial and biaxial, and a free coupling is provided between the rotating shafts. Thereby, the displacement on the detected shaft side is absorbed by the coupling, and the length between the detected shaft and the detector is shortened.
It is an object of the present invention to provide an angle detector structure in which the angle detection accuracy and reliability are improved, and each rotating shaft is directly joined to an oily substance to obtain smooth rotation.

[0005]

According to the present invention, there is provided an angle detector structure having a structure in which a rotor is rotatably disposed inside a ring-shaped stator provided in a case and having a stator winding. A first rotating shaft supporting the rotor, and a second rotating shaft provided coaxially with the first rotating shaft.
A rotating shaft; first and second flange portions formed on the first and second rotating shafts and extending in a radial direction;
With a universal coupling provided between the flanges,
The first and second flange portions are directly joined to each other, and an oily substance is provided between the first and second flange portions. A part is directly joined to each other, and an oily substance is provided between the first rotation shaft and a part of the case, and the case is provided with a lid, The lid and the second flange are directly joined, and an oily substance is provided between the lid and the second flange.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an angle detector structure according to the present invention will be described below with reference to the drawings. Note that the same reference numerals are used for the same or equivalent parts as in the conventional example. In FIGS. 1 and 2, what is indicated by reference numeral 3 is:
The angle detector 100, which is a VR resolver, a resolver with a rotary transformer, or the like, has a U-shaped cross section and is formed in a ring shape. The inner wall 3a of the case 3 includes:
An annular stator 1 having stator windings 2 for excitation and output is provided. The annular stator 1 is positioned at a predetermined position by a lid 10 provided on an end surface of a case 3.

Inside the ring-shaped stator 1, a hollow first rotation shaft 4 having a ring-shaped rotor 5 made of a magnetic material and having no winding is rotatably provided. , A hollow second rotating shaft 11 is rotatably provided coaxially. A first flange portion 4A extending in a radial direction is formed at an end portion of the first rotating shaft 4, and a second flange portion extending in a radial direction is formed at an end portion of the second rotating shaft 11. A portion 11A is formed. The rotary shafts 4 and 11 and the flanges 4A and 11A are directly joined to each other via an oily substance 80 such as grease, and a part 3b of the case 3 of the first rotary shaft 4 via the oily substance 80. The lid 10 and the second flange 1
1A is directly joined via an oily substance 80 so as to be relatively rotatable.

The first and second flange portions 4A, 11A
Are connected to each other so as to be relatively movable along the axial direction, and a plate-like coupling portion 12 formed in a ring shape is provided between the flange portions 4A and 11A.

As shown in FIG. 3, the first and second rotating shafts 4 and 11 are engaged with the first to fourth concave portions 20 to 23 of the coupling portion 12 to form an Oldham coupling. The universal coupling 30 is constituted. That is, the first and second convex portions 31 and 32 of the first rotating shaft 4 are engaged with the second and fourth concave portions 21 and 23 to move the X-direction moving mechanism 40.
And the third and fourth protrusions 33 and 34 of the second rotation shaft 11.
Is engaged with the first and third concave portions 20 and 22 to constitute a Y-direction moving mechanism 50.

As shown in FIG. 3, the X-direction moving mechanism 40 has a fit of -X due to the engagement between the first convex portion 31 and the fourth concave portion 23, and the second convex portion 32 and the second concave portion 21 And the engagement is + X. As shown in FIG. 3, the Y-direction moving mechanism 50 has a fitting of + Y due to the engagement between the third convex portion 33 and the first concave portion 20, and the engagement between the fourth convex portion 34 and the third concave portion 22. , The fit is -Y. Accordingly, each of the rotating shafts 4 and 11 can be relatively moved in the + -X direction and the + -Y direction by the mechanisms 40 and 50 described above, so that the detected shaft 60 connected to the second rotating shaft 11 is moved in the XY direction. Even when a vibration or vibration occurs in the direction, the vibration or vibration is absorbed by the free coupling 30 and is not transmitted to the first rotating shaft 4 side, that is, the rotor 5 side, and stable angle detection can be performed. Although the present invention has been described in connection with a VR resolver, the present invention can also be applied to a non-VR type resolver and a resolver with a rotary transformer. In addition, although the case of the annular rotor has been described, the rotor may be non-annular, and may or may not include the winding in the rotor.

[0011]

Since the angle detector structure according to the present invention is constructed as described above, the following effects can be obtained. That is, the second rotating shaft is coaxially disposed with respect to the first rotating shaft having the rotor, and a coupling portion is provided between the respective shafts to form a free coupling. Vibration and run-out are not transmitted to the rotor side, achieving high-precision angle detection and long life, and a compact axial length and cost reduction. In addition, since the rotary shafts, the rotary shaft and a part of the case, the flanges, and the lid and the second flange are directly rotatably joined to each other via an oily substance, the anti-friction effect is achieved. It is performed effectively, and the sliding noise is reduced and the life is extended.

[Brief description of the drawings]

FIG. 1 is a front view showing an angle detector structure according to the present invention.

FIG. 2 is a sectional view taken along the line AOA of FIG.

FIG. 3 is an exploded configuration view showing the universal coupling of FIG. 2;

FIG. 4 is a sectional view showing a conventional configuration.

[Explanation of symbols]

 Reference Signs List 1 ring-shaped stator 2 stator winding 3b part 4 first rotating shaft 4A first flange portion 5 rotor 11 second rotating shaft 11A second flange portion 30 universal coupling 80 oily substance

Claims (3)

[Claims] An angle detector structure comprising a rotor (5) rotatably disposed inside a ring-shaped stator (1) having a stator winding (2) provided on a case (3), A first rotating shaft (4) for supporting a rotor (5), and the first rotating shaft;
(4) a second rotary shaft (11) provided coaxially, and first and second flange portions formed on the first and second rotary shafts (4, 11) and extending in the radial direction. (4A, 11A) and the universal coupling (30) provided between the first and second flange portions (4A, 11A).
The first and second flange portions (4A, 11A) are directly joined to each other, and the first and second flange portions (4A, 11A) are connected to each other.
An angle detector structure characterized in that an oily substance (80) is provided between A, 11A). 2. The first rotating shaft (4) and a part (3a) of the case (3) are directly joined to each other, and the first rotating shaft (4) and one part of the case (3) are connected to each other. Oily substance (80) between part (3a)
The angle detector structure according to claim 1, wherein the angle detector is provided. 3. The case (3) is provided with a lid (10),
The lid (10) and the second flange portion (11A) are directly joined, and an oily substance (80) is provided between the lid (10) and the second flange portion (11A). The angle detector structure according to claim 1 or 2, wherein: