JP2006090501A - Rolling bearing device with power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device with a power generator capable of improving power generation efficiency by a simple configuration. <P>SOLUTION: A magnetized part 9 and a non-magnetized part 36 are formed on a magnetized ring 3 across an equal interval toward the peripheral direction, and a guiding part 13 for guiding magnetic flux is provided on a magnetic ring 4 in a corresponding manner to the magnetized part 9. When the guiding part 13 opposes to the magnetized part 9, a first condition in which magnetic flux guided into a power generation coil 5 exists occurs. When the guiding part 13 opposes to the non-magnetized part 36, a second condition in which magnetic flux guided into the power generation coil 5 is reduced more than that in the first condition occurs. By switching these first and second conditions accompanying with relative rotation of inner and outer rings 32, 30, electromotive force is generated in the power generation coil 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rolling bearing device having a power generation function.

2. Description of the Related Art Conventionally, rolling bearing devices having various structures have been known as rolling bearing devices that rotatably support wheels of automobiles, rotating shafts of industrial machines, and the like and have a power generation function. For example, as used in an antilock brake device of an automobile, a generator having a stator and a rotor, the rotor being a multipolar magnet having a number of magnetic poles arranged in a circumferential direction, and a rotor provided in the stator Some include a magnetic sensor that detects a magnetic pole, and a power supply circuit that uses power generated by the generator as a power source for the magnetic sensor. This rolling bearing device generates electric power with a multipolar magnet attached to an inner ring and a magnetic ring that houses a power generation coil attached to an outer ring, and detects the rotational speed with a magnetic sensor (Patent Document 1). reference).
Japanese Patent Laying-Open No. 2003-262645 (FIG. 3)

However, in the rolling bearing device of Patent Document 1, the power generation coil is housed in a magnetic ring formed in a cross-sectional box shape, and is further positioned by the resin surrounding it. A magnetic sensor is accommodated in the same magnetic ring. Therefore, the structure for detecting the generator and the speed is complicated, and the manufacturing work is very complicated. In addition, there is a problem in that the change in magnetic flux induced in the power generation coil is small and the power generation efficiency is not sufficient.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rolling bearing device with a generator that has improved power generation efficiency with a simple configuration in view of such conventional problems.

In order to achieve the above object, the present invention takes the following technical means.
That is, the present invention provides a pair of race rings that are relatively rotatable with each other via rolling elements, a magnetized ring attached to one of the race rings, and a ring attached to the other race ring side. A magnetic ring facing the magnetic ring, and a power generating coil that circulates between the magnetized ring and the magnetic ring, wherein the magnetized ring has a magnetized portion and a non-magnetized portion in a circumferential direction. The magnetic ring is formed alternately, and the magnetic ring is provided with induction portions for inducing magnetic fluxes at a pitch corresponding to the pitch between the magnetization portions, and when the induction portions are opposed to the magnetization portions, the power generation coil A first state in which there is a magnetic flux induced to the non-magnetized portion, and a second state in which the magnetic flux induced to the power generation coil is less than that in the first state when the induction portion faces the non-magnetized portion. Accompanying relative rotation of both members Serial first, characterized in that to generate an electromotive force to said power generation coil by switching the second state.

In this case, when the magnetic ring and the magnetized ring rotate relative to each other with the both race rings, the magnetic ring guiding portion alternately passes through the magnetized portion and the non-magnetized portion of the magnetized ring facing the magnetic ring. Therefore, the first state in which the induction part faces the magnetized part and the second state in which the induction part faces the non-magnetized part are alternately formed.
In the first state, since the magnetic flux is induced to the induction portion, a large amount of magnetic flux passes through the power generation coil provided between the induction portion and the magnetic ring, and in the second state, the magnetic flux is not induced and is generated in the power generation coil. The magnetic flux passing through is reduced from that in the first state. Accordingly, when the two race rings rotate relative to each other, a change in magnetic flux passing through the power generation coil due to switching between the first and second states occurs, and an electromotive force can be generated in the power generation coil.
Moreover, since the induction | guidance | derivation part and the magnetization part are each formed at equal pitches, if both track rings rotate relatively, the magnetic flux which passes along a power generation coil will be switched simultaneously on the perimeter. Thereby, the power generation efficiency of the power generation coil is improved. Both race rings can be configured as a stationary ring or a rotating ring of the bearing device, respectively, but the magnetic ring or magnetized ring may be attached to any of the stationary ring, the rotating ring, the inner ring, and the outer ring. .

In the present invention described above, it is preferable that a yoke for reducing the magnetic flux induced in the power generation coil in the second state is provided.
By providing such a yoke, if the magnetic flux induced in the power generation coil in the second state decreases, the change in the magnetic flux passing through the power generation coil by switching between the first state and the second state increases accordingly. Therefore, power generation efficiency is further improved

  Further, the above-mentioned rolling bearing device with a generator may be provided with a rotational speed detection mechanism for detecting the relative rotational speed of the inner and outer rings. In this case, the rotational speed of the rotating wheel is detected. In this case, a magnetic sensor can be provided as the rotation speed detection mechanism. For example, electric power obtained from the power generation coil can be used as the power source of the magnetic sensor.

  According to the present invention, since the power generating coil that circulates between the magnetized ring in which the magnetized portion is formed and the magnetic ring provided with the guide portion provided corresponding to the magnetized portion is provided, it is simple. The power generation efficiency can be improved by the configuration.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the rolling bearing device 1 with a generator of the present embodiment includes an outer ring 30 (stationary ring), an inner ring 32 (rotating ring) fitted to a rotating shaft (not shown), the inner ring 32 and the outer ring. 30, a plurality of rolling elements 33 provided between the outer ring 30, a magnetized ring 3 fixed to the outer ring 30 via the support portion 2, a magnetic ring 4 fitted to the inner ring 32, and these magnetized rings 3 The power generation coil 5 is provided between the magnetic ring 4 and the power generation coil 5. Further, an outer ring raceway 30b is formed on the outer ring inner peripheral surface 30a, and an inner ring raceway 32b is formed on the inner ring outer peripheral surface 32a so as to face the outer ring raceway 30b. As a result, the outer ring 30 and the inner ring 32 that are relatively rotatable through the plurality of rolling elements 33 constitute a bearing.

As shown in FIG. 1, the annular support portion 2 attached to the outer ring 30 includes an outer casing 6 and a resin 7 filled in the casing 6. The casing 6 includes an inner portion 6a on the rolling wheel side (left side in the figure), a radially outer portion 6b attached to the outermost portion of the inner portion 6a, and an outer portion extending inwardly from the outside of the radially outer portion 6b. 6c. The outer portion 6c is formed with a bent portion a bent at the innermost portion toward the rolling wheel.
The resin is filled in a portion surrounded by the inner portion, the outer diameter portion, and the outer diameter portion of the outer portion, and these members are fixed to each other. The tip of the bent portion a extends to the vicinity of the inner ring so that foreign matter does not enter the bearing device. Furthermore, resin is also provided inside the bent portion a. As shown in the drawing, an accommodation space 8 for accommodating the magnetic ring 4 and the like is formed by the inside diameter of the filled resin, the outside portion 6c, and the bent portion a.

  As shown in FIG. 3, the magnetizing ring 3 has a cylindrical shape, and magnetized portions 9 and non-magnetized portions 10 (neutral areas) are alternately arranged at equal pitches along the circumferential direction. The magnetized portion 9 and the non-magnetized portion 10 have substantially the same circumferential width, and the magnetic poles S and N of the magnetized portion 9 are all directed in the same direction. Therefore, only the S magnetic pole is arranged on one side surface (right side in FIG. 3) of the magnetized ring 3 and only the N magnetic pole is arranged on the other side surface (left side in FIG. 3) at intervals. In order to arrange the magnetized portions 9 and the non-magnetized portions 10 alternately, a method of magnetizing the ring members at regular intervals in the circumferential direction, or a method of alternately connecting the magnets and non-magnetic materials in the circumferential direction. There is. Alternatively, the ring member may be magnetized so that the S magnetic pole and the N magnetic pole circulate around the ring member, and holes may be formed at regular intervals in the circumferential direction. Note that the non-magnetized portion 10 may be slightly magnetized. Further, a power generating coil 5 circulates along the inner peripheral surface 3 a of the magnetized ring 3, and the power generating coil 5 that has been circulated is connected to an external rectifier circuit 11 and a secondary battery 12. Yes.

As shown in FIG. 1A and the like, the magnetizing ring 3 is fixed so that the outer peripheral surface 3b is aligned with the right side of the lower surface of the resin 7 filled in the support portion 2 and N The magnetic poles are arranged with the left side facing. The power generating coil 5 provided on the inner peripheral surface 3 a of the magnetized ring 3 circulates between the magnetized ring 3 and the magnetic ring 4.
The magnetic ring 4 is fixed so that the inner peripheral surface thereof is fitted to the inner ring 32 and the outer periphery thereof faces the lower surface of the resin 7 and the inner peripheral surface 3 a of the magnetized ring 3. As shown in FIG. 4, the magnetic ring 4 is formed with a large number of protrusions 13 extending from a ring-shaped connecting portion 35 in one direction (in the attached state, the outside direction of the device 1). As a comb shape. The protrusion 13 is configured as a guide portion 13 that guides magnetic flux, and a step 14 is formed in the middle thereof.

  Further, the guide portion 13 is formed with an outermost surface A connected to the outer peripheral surface of the connecting portion 35, a step surface B formed on the step 14, and an opposing surface C extending outward from the step surface B. A side surface D extending from the end of the surface C in the radially inward direction is formed. In addition, the guiding portion 13 and the guiding portion 13 are connected only by the connecting portion 35 and become a non-inducing portion 36. Further, the circumferential width of the guiding portion 13 is substantially the same as the circumferential width of the magnetized portion 9 of the magnetized ring 3, and the guiding portion 13 corresponds to the magnetized portion 9 of the magnetized ring 3. It is formed with such a pitch. The magnetic ring 4 is made of a rust-proof magnetic material such as ferritic stainless steel, but is not limited to this, and other magnetic materials can be used.

As shown in FIG. 1A, in the first state in which the guide portion 13 faces the magnetized portion 9, the outermost surface A of the magnetic ring 4 faces the lower surface of the resin 7, and the stepped surface B is magnetized. The ring 3 is close to the N magnetic pole, and the facing surface C faces the inner peripheral surface 3 a of the magnetized ring 3.
Accordingly, as shown in FIG. 1B, when the first state is established, the guide portion 13 of the magnetic ring 4 overlaps the magnetized portion 9 of the magnetized ring 3 when viewed from the radial direction, The part extending from the N magnetic pole to the inner diameter side of the magnetic part 9 is almost covered with the stepped surface B and the opposing surface C of the guiding part 13. Thereby, at the time of the 1st state, the magnetic flux of the magnetized part 9 is induced | guided | derived to the induction | guidance | derivation part 13, and passes the inside of the generator coil 5. FIG.

On the other hand, as shown in FIG. 2A, in the second state in which the induction portion 13 is opposed to the non-magnetized portion 10 (not opposed to the magnetized portion 9), the non-inductive portion 36 is When the guiding portion 13 is displaced from the magnetized portion 9 when viewed from the radial direction, there is no guiding portion 13 on the inner diameter side of the magnetized portion 9. Therefore, the magnetic flux of the magnetized portion 9 is dispersed without being induced toward the magnetic ring 4. For this reason, the magnetic flux passing into the power generation coil 5 is reduced as compared with the first state.
That is, when the magnetic ring 4 fitted to the inner ring 32 is rotated with respect to the magnetized ring 3, the induction portions 13 of the magnetic ring 4 are in contact with the magnetized portions 9 of the magnetized ring 3. It passes through the magnetic part 10 one after another. With the movement of the magnetic ring 4, the first state and the second state are simultaneously switched in all the magnetized portions 9.

In this way, when the inner ring 32 rotates with respect to the outer ring 30 which is a fixed ring and the first state and the second state are switched, a change in magnetic flux passing through the power generation coil 5 occurs, and accordingly the power generation coil An electromotive force is generated at 5. Since the generated electric power is alternating current, this electric power is converted into direct current by the rectifier circuit and then stored in the secondary battery. This power can be used, for example, as a power source for a magnetic sensor described later.
In the rolling bearing device with power generation 1 configured as described above, the first state and the second state are simultaneously switched in accordance with the rotation of the inner ring 32 in all the magnetized portions 9 of the magnetized ring 3, and the power generating coil 5 Since the magnetic flux passing through the inside is changed, extremely high power generation efficiency can be obtained. Further, since the magnetic ring 4 is attached to the inner ring 32 and the magnetized ring 3 is attached to the outer ring 30 and the power generating coil 5 is circulated between them, the production is easy. Further, the power generating coil 5 only circulates the inner peripheral surface 3a of the magnetized ring 3, and for example, it is not necessary to meander or make a complicated winding, so that the production work is not troublesome and the cost is reduced. It is done.

  FIGS. 5A and 5B show a rolling bearing device 15 with a generator according to a second embodiment of the present invention. The bearing device 15 is different from the first embodiment in that a yoke 16 for reducing the magnetic flux induced in the power generation coil 5 in the second state is provided. The yoke 16 has an inverted L-shaped cross section and has an annular shape, and includes a peripheral surface portion 16a extending in the left-right direction in the drawing and a side portion 16b extending radially inward from the right end of the peripheral surface portion 16a. The peripheral surface portion 16 a is fixed in the resin 7 and is disposed along the outer peripheral surface 3 b of the magnetized ring 3. Further, the side portion 16 b is fixed along the inner surface of the outer side portion 6 c of the casing 6. The yoke 16 is made of a magnetic material that can induce magnetic flux, and induces the magnetic flux of the magnetized portion 9.

Further, as shown in FIG. 4A, in the first state, as described above, the guide portion 13 of the magnetic ring 4 faces the inner peripheral surface 3a of the magnetized ring 3, but at this time, the yoke The distance between the tip of the peripheral surface portion 16 a on the rolling wheel side and the N magnetic pole of the magnetized portion 9 is farther than the step surface B of the N magnetic pole and the guide portion 13. The distance between the yoke 16 and the magnetized ring 3 is such that no magnetic flux is induced as shown in FIG. 4 (a) in the first state, and as shown in FIG. 4 (b) in the second state. The dimensions are set so as to guide.
Accordingly, since the yoke 16 guides the magnetic flux to pass outside the coil 5 in the second state, the magnetic flux passing through the power generation coil 5 is further reduced in the second state. Thereby, the change of magnetic flux by switching between the first state and the second state becomes larger, and the power generation efficiency becomes extremely high.

  FIG. 6 shows a rolling bearing device 17 with a generator according to a third embodiment of the present invention. The bearing device 17 is different from the first embodiment in that the support portion 2 is provided with a rotational speed detection mechanism 18, a transmitter 24, and the like. In the casing 6, a permanent magnet 20 having an N magnetic pole formed radially inside and an S magnetic pole formed radially outward, a magnetic sensor 21 disposed between the permanent magnet 20 and the magnetic ring 4, and a rectifier circuit 22. A secondary battery 23, a transmitter 24, and a transmission antenna 25 are incorporated. The magnetic sensor 21 detects a change in magnetic flux of the permanent magnet 20 and outputs this as a rotation speed signal. The magnetic sensor 21 employs a Hall IC incorporating a Hall element, but is not limited to this.

  When the inner ring 32 rotates, the guiding portion 13 and the non-inducing portion 36 of the magnetic ring 4 alternately pass through the place facing the permanent magnet 20. As shown in FIG. 6, in the first state in which the N magnetic pole of the permanent magnet 20 and the outermost surface A of the guide portion (projection portion) 13 are close to each other, the magnetic flux is guided to the guide portion 13 and the magnetic sensor. Go through 21. On the other hand, the magnetic flux is not induced toward the magnetic ring 4 in the second state where the non-inductive portion 36 comes to face the permanent magnet 20. Therefore, the magnetic flux passing through the magnetic sensor 21 changes when the first and second states are switched. The magnetic sensor 21 detects this change in magnetic flux, and a rotation speed signal is sent to the transmitter 19. The signal sent to the transmitter 19 is wirelessly transmitted to a receiver (not shown) outside the apparatus via the transmission antenna 24.

  Further, the electric power generated in the power generation coil 5 is converted from an AC voltage to a DC voltage by the rectifier circuit 22, and this electric power is stored in the secondary battery 23. The electric power stored in the secondary battery 23 serves as a power source for the magnetic sensor 21 and the transmitter 19. Therefore, the bearing device 17 of the present embodiment can detect the rotational speed, and it is necessary to provide a separate power source. There is no self-power generation type. Further, since the signal detected by the magnetic sensor 21 can be transmitted wirelessly, there is no need to lead out a harness from the bearing device 17, and it does not take time to assemble the bearing device 17. The problem of disconnection does not occur.

FIGS. 7A and 7B show a rolling bearing device 25 with a generator according to a fourth embodiment of the present invention. The bearing device 25 is different from each of the above embodiments in that the magnetic ring 26 and the magnetized ring 27 are attached to the opposite race rings of the above embodiments. That is, the magnetic ring 26 is attached to the outer ring 30 and the magnetized ring 27 is attached to the inner ring 32.
The magnetized portion 9 of the magnetized ring 27 is provided with the N magnetic pole facing outward and the S magnetic pole facing the rolling wheel. The inner ring 32 is fitted with a magnetized ring 27 and a ring-shaped contact member 28 with which the magnetized ring 27 is in contact. This abutting member 28 serves as a stopper so that the magnetized ring 3 does not go too far to the rolling wheel side. Therefore, the magnetized ring 3 is positioned by the S magnetic pole side coming into contact with the contact member 28.

  As shown in FIG. 8, the magnetic ring 26 is configured as an annular member, and is configured as a pair of split rings including a left first ring 40 and a right second ring 41 facing in the axial direction. A large number of trapezoidal protrusions 42 that narrow toward the tip are formed on the first ring 40 from the left side surface toward the inner diameter direction. The protrusion 42 is extended to a position where the tip thereof is close to the left end portion of the magnetizing ring 27, and serves as a guide portion 42 that guides the magnetic flux of the magnetized portion 9. Further, the pitch at which the guide portion 42 is provided is the same pitch as the magnetized portion 9 of the magnetized ring 27.

  The second ring 41 has the same outer diameter as the inner diameter of the first ring 40, and a plurality of comb teeth 43 extending toward the left side are formed on the inner diameter portion. The comb teeth 43 are extended along the bent portion a of the casing 6 to a position covering the inner diameter side of the N magnetic pole of the magnetized ring 27 and serve as the yoke 43 of the magnetized portion 9. The pitch at which the comb teeth 43 are provided is the same pitch as that of the magnetized portion 9, that is, the same pitch as that of the guide portion 42 (protrusion) of the first ring 40. The first ring 40 and the second ring 41 are incorporated in the inner and outer rings 32 and 30 in a state where the outer peripheral surface of the second ring is fitted to the inner peripheral surface of the first ring 40 and are magnetic. A ring 26 is formed.

The power generating coil 5 circulates on the inner peripheral surface 26 a of the magnetic ring 26 and is disposed between the magnetic ring 26 and the magnetized ring 27 as shown in the figure. The power generating coil 5 is connected to a rectifier circuit (not shown).
Therefore, as shown in FIG. 7A, when the S magnetic pole of the magnetized portion 9 is in the first state close to the guide portion 42 of the first ring 40, the comb teeth 43 (yoke) of the second ring 41 ) Does not face the magnetized portion 9. On the other hand, as shown in FIG. 7B, when the S magnetic pole of the magnetized portion 9 is not close to the induction portion 42, the comb teeth 43 are opposed to the magnetized portion 9. As described above, in the first state shown in FIG. 7A, the magnetic flux of the magnetized portion 9 is guided to the guiding portion 42 as indicated by the arrow in the figure, and most of the magnetic flux passes through the power generating coil 5.

On the other hand, in the second state shown in FIG. 7B, the magnetic flux passing through the power generation coil 5 without being induced by the induction portion 42 is reduced as compared with the first state, as indicated by the arrows in the figure. That is, when the magnetized ring 27 rotates with respect to the magnetic ring 26, the magnetized portions 9 pass through the respective guide portions 42 one after another, and in accordance with this movement, The state and the second state are switched at the same time. Thus, when the first state and the second state are switched, the magnetic flux passing through the power generation coil 5 changes, and accordingly, an electromotive force is generated in the power generation coil 5.
In the rolling bearing device with power generation 25 configured as described above, the first state and the second state are simultaneously switched in all the magnetized portions 9 of the magnetized ring 27 to change the magnetic flux passing through the power generating coil 5. Therefore, extremely high power generation efficiency can be obtained. Further, since the power generating coil 5 is made to circulate on the inner peripheral surface 26a of the magnetic ring 26, the manufacturing is very easy. Although not shown in the figure, a rectifier circuit, a transmitter, or the like may be incorporated in the support unit 2.

  In addition, the said embodiment is an illustration and is not restrictive. For example, the shapes of the magnetic ring 4 and the magnetized ring 3 may be changed, and electric power generated by further incorporating other devices in the bearing device 1 may be used as these power sources. Further, the present invention can be applied not only to the rolling bearing of the above embodiment but also to any type of rolling bearing.

(A) is principal part sectional drawing which shows the 1st state of the rolling bearing apparatus with a generator, (b) is AA sectional view taken on the line of (a). (A) is principal part sectional drawing which shows the 2nd state of a rolling bearing apparatus with a generator, (b) is BB sectional drawing of (a). It is a perspective view of the magnetized ring provided with the power generation coil. It is a partial decision perspective view of a magnetic ring. (A) is principal part sectional drawing which shows the 1st state of the rolling bearing apparatus with a generator of 2nd Embodiment, (b) is principal part sectional drawing which shows the 2nd state. It is principal part sectional drawing of the rolling bearing apparatus with a generator of 3rd Embodiment. (A) is principal part sectional drawing which shows the 1st state of the rolling bearing apparatus with a generator of 4th Embodiment, (b) is principal part sectional drawing which shows the 2nd state. It is a perspective view which shows a magnetic ring and a magnetized ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus with a generator 2 Support part 3 Magnetization ring 4 Magnetic ring 5 Power generation coil 9 Magnetization part 13 Induction part 18 Rotational speed detection mechanism 21 Magnetic sensor 30 Outer ring 32 Inner ring 36 Non-induction part

Claims (3)

A pair of race rings that can rotate relative to each other via rolling elements, a magnetized ring attached to one of the race rings, and a magnet attached to the other race ring and facing the magnetized ring A ring, and a power generation coil that circulates between the magnetized ring and the magnetic ring,
In the magnetized ring, magnetized portions and non-magnetized portions are alternately formed in the circumferential direction, and in the magnetic ring, induction portions for inducing magnetic flux are formed at a pitch corresponding to the pitch between the magnetized portions. Provided,
When the induction part faces the magnetized part, the magnetic flux induced into the power generation coil is in a first state,
When the induction part faces the non-magnetized part, the magnetic flux induced into the power generation coil is in a second state where the magnetic flux is reduced from the first state,
A rolling bearing device with a generator, wherein an electromotive force is generated in the power generation coil by switching between the first and second states accompanying relative rotation of the two race rings.   The rolling bearing device with a generator according to claim 1, wherein a yoke for reducing magnetic flux induced in the power generation coil in the second state is provided.   The rolling bearing device with a generator according to claim 1 or 2, further comprising a rotation speed detection mechanism that detects a relative rotation speed of the both race rings.

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