JP4285151B2 - VR resolver rotor and rolling bearing device - Google Patents

Description

  The present invention relates to a rotor for a VR (variable reluctance) type resolver having a shaft angle multiplier of 2X and a rolling bearing device with a VR type resolver having a shaft angle multiplier of 2X.

The resolver is composed of a stator and a rotor, and as disclosed in Patent Document 1, etc., its use and development as a rotation detection sensor have been promoted in recent years because of its robust structure and high detection resolution. It is coming. There are various types of resolvers such as 1X and 2X. The shaft double angle represents the double speed ratio of the output angle signal, and is indicated by adding “X” to the double speed number. For example, at the shaft double angle 2X, an output signal corresponding to two rotations is output by one shaft rotation.
Japanese Utility Model Publication No. 56-110304

  By the way, the cross-sectional shape of a rotor for a VR resolver having a shaft angle multiplier of 2X includes an ellipse, an oval, and the like. However, it takes time and cost to form the rotor metal material into an oval or oval shape, and the oval or oval outer peripheral surface must be formed into an accurate symmetrical shape with respect to the major axis. There is also a problem that it is difficult to detect rotation with high accuracy.

  (1) The VR resolver rotor of the present invention has a cross-sectional shape having a shape surrounded by a pair of arcs having arc centers at different positions on the same line and having the same radius. To do.

  According to the rotor of the present invention, since the cross-sectional shape is provided, it is not necessary to take time and cost for its manufacture, and its outer peripheral surface can be easily and accurately formed into a symmetrical shape with respect to the long axis, and has high accuracy. A resolver rotor capable of detecting rotation can be provided.

  (2) The rolling bearing device of the present invention is a rolling bearing device with a VR type resolver having a shaft angle multiplier of 2X, in which a stator is provided on the outer ring and a rotor is provided on the inner ring, and the rotors are different on the same line. It has a cross-sectional shape surrounded by a pair of arcs each having a circular arc center at the position and having the same radius.

  According to the rolling bearing device of the present invention, it is only necessary to turn the outer peripheral portion of the metal material, which is a material of the rotor, into an arc shape twice, so that the outer peripheral surface of the rotor can be detected with high accuracy. As a rolling bearing device equipped with this rotor, a device capable of detecting rotation with high accuracy can be provided at low cost.

  According to the present invention, it is possible to provide a resolver rotor that can save time and cost for manufacturing a rotor, and can easily and accurately form an outer peripheral surface thereof in a symmetrical shape and detect rotation with high accuracy. .

  Hereinafter, the details of the present invention will be described with reference to the illustrated embodiments. FIGS. 1 to 3 relate to the best embodiment of the present invention, and FIG. 2 is a front view thereof, FIG. 3 is an explanatory view showing a manufacturing process of the rotor of FIG. 1, and FIG. 3A is a first-stage turning process. B) shows the second stage turning process, respectively.

  With reference to these drawings, the resolver 1 used in the rolling bearing device of the present invention includes a stator 2 and a rotor 3.

  The stator 2 is attached to a non-rotating member 4 as an outer ring, and is wound around each of the core 21 having a ring shape and n pole teeth 21a, 21a in the inner diameter side circumferential direction, and each pole tooth 21a of the core 21. The winding 22 is mounted. The winding 22 includes an excitation winding wound around each pole tooth 21a, a first detection winding wound around every other pole tooth 21a, and every other pole tooth. And a second detection winding wound around 21a.

  The rotor 3 is made of a metal material such as iron, and is provided coaxially with a rotating member 5 as an inner ring so as to rotate on the inner peripheral side of the stator 2. The rotor 3 is a quasi-elliptical cylindrical body or solid column having a long radial cross section along the one diameter direction so as to have inductor portions 31 and 31 at both ends in one diameter direction. .

In short, the cross-sectional shape of the rotor 3 is _first and _second having arc centers P ₁ and P ₂ at different positions on the same line and having the same radii R ₁ and R ₂ (R ₂ = R ₁ ). The shape is surrounded by arcs C ₁ and C ₂ .

Specifically, of the two arcs C ₁ and C ₂ , the first arc C ₁ has a radius R ₁ with a point P ₁ set at a position separated from the rotation center O of the rotor 3 by a distance s ₁ as the arc center. It is an arc drawn over about 180 degrees. In this case, the rotation center O of the rotor 3 is located between the first arc C ₁ and its arc center P _1.

Second circular C ₂ is for about 180 degrees on the first side opposite to the arc C ₁ with respect to the rotational center O of the rotor 3 (the lower side of the rotation center O in FIG. 2), the first radius of the circular arc C ₁ an arc drawn by R ₁ and the same radius _{R 2 (R 2 = R 1} ). The arc center P ₂ is a point set at a position that is point-symmetric with the arc center P _{1 of} the first arc C ₁ with respect to the rotation center O of the rotor 3. Therefore, the distance s ₂ from the rotation center O of the rotor 3 to the arc center P ₂ of the second circular C _2, the distance s ₁ from the rotation center O of the rotor 3 to the arc center P ₁ of the first arc C ₁ equally, the first and the two arc center _P 1, _{P 2} of the second circular _C 1, _{C 2,} arranged in the same straight line from the rotational center O of the rotor 3.

  The rotor 3 may be configured separately from the rotating member 5 and may be attached coaxially to the rotating member 5 or may be formed integrally with the rotating member 5.

  In manufacturing the rotor 3, as shown in FIGS. 3A and 3B, the outer peripheral portion of the material 30 made of a columnar or cylindrical metal material to be the rotor 3 is turned twice in an arc shape. That's fine.

That is, as shown in FIG. 3A, a material 30 made of a columnar or cylindrical metal material having a radius R ₀ is prepared, and the center thereof is set as the rotation center O of the rotor 3. Then, the point P ₁ is set from the rotation center O at a constant distance s ₁ apart position as the arc center, assuming a first arc C ₁ of radius R _1, the material 30 along the arc C ₁ A part of the outer periphery (the upper half in the figure) is turned over a range slightly wider than 180 degrees. This is the first stage of turning, whereby a material 30 is obtained in which about half of the outer periphery 30a is turned.

FIG. 3B shows the second stage of turning. The turning of the second stage, after setting another point P ₂ to the position where the arc center P ₁ and the point symmetry of the first arc C ₁ with respect to the rotational center O of the rotor 3, a circular arc centered on the point P ₂ Assuming a _second arc C ₂ drawn with the same radius as the first arc C ₁ , the remaining half 30 b of the outer peripheral portion of the material 30 is turned along the second arc C ₂ . Thus, each half 30a, 30b of the outer peripheral portion is turned into an arc shape, and the rotor 3 having a cross section of a pseudo-elliptical shape is obtained.

  In the above manufacturing method, it is only necessary to turn the outer peripheral portion of the material 30 in an arc shape twice, and it is not necessary to perform turning along a complicated non-arc curve such as an ellipse. A highly accurate rotor 3 is obtained.

  Note that the rotor 3 may be formed into a pseudo-elliptical shape by casting or forging, or a material having a pseudo-elliptical shape by casting or forging. You may turn the outer peripheral part of.

  The rolling bearing device of the present invention will be described with reference to FIG. FIG. 4 shows an example of a rolling bearing device for supporting a wheel in an automobile or the like with a sensor for detecting the rotational state of the wheel for an anti-skid brake system (ABS), and using a resolver for this sensor. is there. In FIG. 4, the left side is the vehicle outer side, and the right side is the vehicle inner side.

  The rolling bearing device according to the present embodiment is a double-row angular ball bearing type rolling bearing device that supports a driven wheel of an automobile, and includes a rolling element including an outer ring 11, an inner shaft 12, an inner ring 13, and a plurality of balls. 14, 15, two cages 16, 17, a single seal 18, a cover 19, and the resolver 1.

  The outer ring 11 is fixed to a vehicle body side member such as a carrier in a non-rotating manner, and has raceways 11a and 11b in double rows on the inner periphery. The inner shaft 12 has an inlay portion 121 and a wheel mounting flange portion 122 on the vehicle outer side, and on the outer peripheral surface on the vehicle inner side of the flange portion 122, on the track portion 11 a on the vehicle outer side of the outer ring 11. Opposing track portions 12a are formed. A bolt 23 for fixing a wheel or a brake disk rotor (both not shown) is press-fitted and fixed to the flange portion 122 in a state of passing through the flange portion 122.

  The inner ring 13 has a track portion 13b facing the track portion 11b on the vehicle inner side of the outer ring 11 on the outer peripheral surface, and is fitted on the outer periphery of a small diameter portion 123 formed on the vehicle inner side of the inner shaft 12. The nut 24 is fixed to the inner shaft 12 by tightening a nut 24 screwed into a screw portion 124 formed on the vehicle inner side with respect to the small diameter portion 123. The rolling elements 14 and 15 are composed of a plurality of balls, between one raceway portion 11 a of the outer ring 11 and the raceway portion 12 a of the inner shaft 12, and between the other raceway portion 11 b of the outer ring 11 and the raceway portion 13 b of the inner ring 13. And are held by the cages 16 and 17 so as to be freely rollable. The seal 18 is provided between the vehicle outer side end portion of the outer ring 11 and the inner shaft 12.

  The cover 19 closes the opening portion of the outer ring 11 on the vehicle inner side due to the shape of a bottomed cylinder, and the cylindrical portion is the inner periphery of the protruding portion 11 c formed in a cylindrical shape on the vehicle inner side of the outer ring 11. It is fitted by press fitting.

  The resolver 1 includes the stator 2 and the rotor 3 described above, and is configured to detect the rotation of the inner ring 13 inside the cover 19.

  The stator 2 is fitted to the inner periphery of the protruding portion 11c of the outer ring 11 by a clearance fit or an intermediate fit. The above-described cover 19 is fitted on the inner periphery of the protruding portion 11c of the outer ring 11 by press-fitting outside the stator 2 in the axial direction. The stator 2 is sandwiched between the step portion 11d on the inner periphery of the outer ring 11 and the inner end of the cylindrical portion of the cover 19, and the axial position is fixed by the sandwiching. A lead wire 22 a from the winding 22 of the stator 2 is drawn out from a hole 19 a formed in the cover 19 or connected to a connector provided in the hole 19 a of the cover 19.

  The rotor 3 is provided integrally with the inner ring 13 by turning the shoulder portion of the inner ring 13 into a cross-sectional shape as shown in FIG.

  In the above configuration, since the shoulder portion of the inner ring 13 which is an essential element as a rolling bearing device is used, it is possible to manufacture a rolling bearing device with a resolver that is inexpensive and has high rotation detection accuracy without increasing the size of the entire device. it can.

  The rotor 3 of the present invention is not limited to the inner ring 13 of the ball bearing, and may be integrally formed by turning on a shoulder portion of the inner ring corresponding to another rolling element such as a tapered roller. Further, the inner ring 13 in which the rotor 3 is integrally formed may be an inner ring that is attached by caulking a part of the inner shaft 12 to the outer peripheral portion of the inner shaft 12. In addition, the present invention is not limited to the so-called third-generation automobile wheel support rolling bearing device in which the inner ring 13 is provided in a single row on the outer peripheral portion of the inner shaft 12, and the inner ring is double-rowed on the outer peripheral portion of the inner shaft. The present invention can also be applied to a 2.5th generation rolling bearing device provided in the above.

  The VR resolver rotor of the present invention is not limited to a rolling bearing device for supporting a wheel of an automobile, but can also be applied to a general rolling bearing device.

Schematic side view of a resolver used in a rolling bearing device according to an embodiment of the present invention. Front view of the resolver in FIG. FIGS. 2A and 2B are explanatory views showing a process for manufacturing the rotor of the resolver in FIG. 1, in which FIG. 1A shows a first stage turning process, and FIG. 2B shows a second stage turning process. Sectional view of the rolling bearing device

Explanation of symbols

1 Resolver 2 Stator 3 Rotor 11 Outer ring
13 Inner ring

Claims (2)

A rotor for a VR type resolver with a shaft double angle of 2X,
A resolver rotor characterized in that the cross-sectional shape has a shape surrounded by a pair of arcs having arc centers at different positions on the same line and having the same radius. In a rolling bearing device with a VR type resolver having a shaft angle multiplier of 2X, in which a stator is provided on the outer ring and a rotor is provided on the inner ring,
The rotor has a cross-sectional shape surrounded by a pair of arcs having arc centers at different positions on the same line and having the same radius, respectively.

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