JP2007078678A - Rotation supporting device with displacement measuring unit, and rotation supporting device with load measuring unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure that determines axial displacement or axial load based on the phase difference between detection signals of a pair of sensors 5a and 5a, and can reduce axial dimension of a detected face of an encoder 4a using a combination of both sensors 5a and 5a. <P>SOLUTION: The encoder 4a is provided with a pair of cylinder sections 9 and 10 superimposed on each other concentrically in the radial direction. An outer-diameter-side detected face 11 facing a detecting section 17 of one sensor 5a is disposed on the outer peripheral surface of the cylinder section 9 on the radial outside, and an inner-diameter-side detected face 12 facing a detecting section 17 of the other sensor 5a is disposed on the outer peripheral surface of the cylinder section 10 on the radial inside. The tilting direction of the boundary of characteristic variation is made different between the outer-diameter-side detected face 11 and inner-diameter-side detected face 12. Employing such a constitution, the above-mentioned problem is solved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  A rotation support device with a displacement measuring device and a rotation support device with a load measuring device according to the present invention are incorporated in, for example, a wheel support portion of an automobile or a rotation support portion of various mechanical devices, and are arranged between a stationary side member and a rotation side member. It is used to measure relative displacement and working load in the axial direction.

  For example, automobile wheels are rotatably supported by a rolling bearing unit such as a double-row angular type rolling bearing unit with respect to a suspension device. Also, in order to ensure the running stability of automobiles, vehicle running stabilization devices such as anti-lock brake system (ABS), traction control system (TCS), electronically controlled stability control system (ESC) are used. Yes. In order to control such various vehicle running stabilization devices, signals such as the rotational speed of the wheels and the acceleration in each direction applied to the vehicle body are required. In order to perform higher-level control, it may be preferable to know the magnitude of a load (for example, one or both of a radial load and an axial load) applied to the rolling bearing unit via a wheel.

  As an invention that can cope with such a problem, for example, Patent Document 1 describes a structure for measuring an axial load applied to a rolling bearing unit. In the case of the structure described in Patent Document 1, screw holes for screwing bolts for coupling the fixed side flange to the knuckle are provided at a plurality of locations on the inner surface of the fixed side flange provided on the outer peripheral surface of the outer ring. Load sensors are attached to the surrounding parts. Each load sensor is clamped between the outer surface of the knuckle and the inner surface of the fixed flange in a state where the outer ring is supported and fixed to the knuckle. In the case of such a load measuring device for a rolling bearing unit, the axial load applied between the wheel and the knuckle is measured by the load sensors.

  However, in the case of the structure described in Patent Document 1, it is necessary to provide the same number of load sensors as bolts for supporting and fixing the outer ring to the knuckle. For this reason, coupled with the fact that the load sensor itself is expensive, it is inevitable that the cost of the entire load measuring device of the rolling bearing unit is considerably increased. Further, since a dedicated sensor is provided for measuring the load applied to the rolling bearing unit, it is inevitable that the cost increases from this point.

  As an invention that can eliminate such inconvenience, for example, Japanese Patent Application No. 2005-147642 discloses the magnitude of a load applied to a rolling bearing unit based on the phase difference between the output signals of a pair of sensors arranged in the direction of load application. An invention (prior invention) is disclosed. 20 to 23 show the structure of the present invention. As shown in FIG. 20, the structure of this prior invention has a hub 2 that is a rotating side member that supports and fixes a wheel on the radially inner side of the outer ring 1 that is a stationary side member that does not rotate while being supported by a suspension device. These are rotatably supported via a plurality of rolling elements 3 and 3. Then, an encoder 4 configured in a cylindrical shape by a permanent magnet is externally fitted and fixed to an intermediate portion of the hub 2, and each of the rolling elements 3 and 3 disposed in a double row at an axially intermediate portion of the outer ring 1. A pair of sensors 5 and 5 are provided in the intermediate portion in a state where the respective detection portions are closely opposed to the outer peripheral surface of the encoder 4 which is the detection surface.

  On the outer peripheral surface of the encoder 4, as shown in FIGS. 21 to 23, a portion magnetized in the N pole (first detected portion) and a portion magnetized in the S pole (second detected portion), They are arranged alternately and at equal intervals (equal center angle pitch) in the circumferential direction. The boundary between the part magnetized in the N pole and the part magnetized in the S pole is inclined by the same angle with respect to the axial direction of the encoder 4, and the inclination direction with respect to the axial direction of the encoder 4 is The axial directions are opposite to each other at the intermediate portion. Therefore, the portion magnetized in the N pole and the portion magnetized in the S pole have a “<” shape with the axially middle portion protruding (or recessed) most in the circumferential direction.

  Each of the sensors 5 and 5 incorporates a magnetic detection element such as a Hall IC, a Hall element, MR, or GMR in the detection unit. The positions at which the detection parts of both the sensors 5 and 5 face the outer peripheral surface of the encoder 4 are the same with respect to the circumferential direction of the encoder 4. In other words, the detection parts of the sensors 5 and 5 are arranged on the same virtual plane including the central axis of the outer ring 1. Further, in a state where an axial load is not applied between the outer ring 1 and the hub 2, a circumferential direction is provided at an axial intermediate portion between the portion magnetized at the N pole and the portion magnetized at the S pole. The positions where the members 4, 5 and 5 are installed are such that the most protruding part (the part where the inclination direction of the boundary changes) exists at the center position between the detection parts of the sensors 5 and 5 above. It is regulated. In the structure shown in the figure, since the encoder 4 is made of a permanent magnet, no permanent magnet is incorporated on both the sensors 5 and 5 side.

  In the case of the structure of the prior invention configured as described above, when an axial load is applied between the outer ring 1 and the hub 2, the phase at which the output signals of the sensors 5, 5 change is shifted. That is, in the state where an axial load is not applied between the outer ring 1 and the hub 2, the detecting portions of the sensors 5 and 5 are on the solid lines A and B in FIG. It faces a portion that is shifted by the same amount in the axial direction from the most protruding portion. Accordingly, the phases of the output signals of the sensors 5 and 5 coincide as shown in FIG. On the other hand, when a downward axial load acts on the hub 2 to which the encoder 4 is fixed in FIG. 23A (the outer ring 1 and the hub 2 are relatively displaced in the axial direction), The detection parts of both the sensors 5 and 5 are opposed to the broken lines B and B in FIG. 23A, that is, the parts different from each other in the axial direction from the most protruding part. In this state, the phases of the output signals of the sensors 5 and 5 are shifted as shown in FIG. Further, when an upward axial load is applied to the hub 2 to which the encoder 4 is fixed as shown in FIG. 23A, the detecting portions of both the sensors 5 and 5 are connected to the chain line haf shown in FIG. , C, that is, the deviation in the axial direction from the most projecting portion opposes different portions in the opposite direction. In this state, the phases of the output signals of the sensors 5 and 5 are shifted as shown in FIG.

  Thus, in the case of the structure of the prior invention, the phases of the output signals of the sensors 5 and 5 are shifted in the direction corresponding to the direction of the axial load applied between the outer ring 1 and the hub 2. Further, the degree to which the phase of the output signals of the sensors 5, 5 is shifted by this axial load (displacement amount) increases as the axial load increases. Therefore, in the case of the above-described prior invention, the presence or absence of a phase shift between the output signals of the sensors 5 and 5 and, if there is a shift, based on the direction and size of the outer ring 1 and the hub 2. The direction and magnitude of the relative displacement in the axial direction, and thus the direction and magnitude of the axial load acting between the outer ring 1 and the hub 2 can be obtained. The frequency of the output signals of the sensors 5 and 5 is proportional to the rotational speed of the wheels. Therefore, the rotational speed of the wheel can be obtained based on the frequency of the output signal of at least one sensor 5. Thus, in the case of the structure of the prior invention, not only the axial load acting between the outer ring 1 and the hub 2 but also the rotation of the wheel by the single encoder 4 and the pair of sensors 5 and 5. You can also ask for speed. For this reason, it is possible to reduce the cost of an apparatus for measuring information for driving control of an automobile.

  In Japanese Patent Application No. 2005-147642, the encoder 4 is made of a magnetic material, the first detected portion is a concave portion, the second detected portion is a convex portion, and the pair of sensors 5 It is described that a structure in which a permanent magnet is incorporated on the 5 side can be adopted. Even when such a structure is adopted, the axial load and the rotational speed can be obtained based on the same principle as that of the structure shown in FIGS.

The displacement measuring device including the encoder 4 and the sensors 5 and 5 as described above is a rotation support device that constitutes various machine devices such as a machine tool in addition to the wheel support bearing unit as shown in FIG. It can also be used by incorporating it in
In any case, the encoder 4 of the prior invention having the above-described configuration has a problem that it is difficult to meet the demand for downsizing in the axial direction so that it can be installed in a narrow space. That is, in order to ensure the reliability of the measured values of the axial displacement and the axial load related to the displacement measuring device described above, it is necessary to stabilize the waveform of the output signal of each of the sensors 5 and 5. For this purpose, a pair of detection surfaces {first detected portion (N pole, concave portion) and second detected portion (S pole, convex portion) facing the detection portions of these sensors 5, 5 It is necessary to secure at least a predetermined amount in each of the axial dimensions of a pair of circular ring surfaces with the inclinations of the boundaries opposite to each other. On the other hand, in the case of the encoder 4 of the prior invention described above, a configuration is adopted in which both the detected surfaces are arranged in series in the axial direction on the peripheral surface of the cylindrical portion (the outer peripheral surface of the encoder 4). . For this reason, it is necessary to ensure the axial dimension of the cylindrical portion (the encoder 4) at least twice the predetermined amount. Therefore, in the case of the encoder 4 of the above-described invention, the axial dimension of the cylindrical portion provided with the two detection surfaces is easily bulky, and the axial size reduction requirement (in particular, the axial dimension of the cylindrical portion is the above-described It is difficult to respond to a request that is less than twice the predetermined amount.

Japanese Patent Laid-Open No. 3-209016

  The rotation support device with a displacement measuring device and the rotation support device with a load measuring device according to the present invention have been invented to realize a structure that can sufficiently meet the downsizing requirement in the axial direction of the encoder in view of the above-described circumstances. is there.

The rotation support device with a displacement measurement device or the rotation support device with a load measurement device according to the present invention includes a rotation support device and a displacement measurement device or a load measurement device.
Among these, the rotation support device has a stationary side track on the stationary side circumferential surface and does not rotate during use, and a rotation side member that has a rotation side track on the rotating side circumferential surface and rotates during use. A plurality of rolling elements are provided between the rotation side track and the stationary side track so as to be freely rollable.
The displacement measuring device or the load measuring device includes an encoder and a pair of sensors.
Of these, the encoder has a pair of cylindrical portions arranged concentrically and overlapping in the radial direction. The outer peripheral surface or inner peripheral surface of each cylindrical portion is a detected surface, and the rotation It is supported and fixed concentrically with the rotating side member on a side member or a portion that rotates in synchronization with the rotating side member. Then, the characteristics of both of the detected surfaces are alternately changed with respect to the circumferential direction, and the characteristic change pattern with respect to the circumferential direction of at least one of the detected surfaces is changed in the axial direction, which is the direction of displacement to be measured It is gradually changed with a tendency different from that of the other detected surface.
Further, the pair of sensors includes a detection portion of one sensor in a part of one of the detection surfaces in the axial direction of one detection surface and a detection portion of the other sensor as the other detection surface. Are supported by a portion that does not rotate even when used in a state of being opposed to a part of each of the axial directions. Then, the pattern of the output signal is changed in accordance with the characteristic change pattern of any one of the above-described detection surfaces each facing its own detection unit.

  In the case of the rotation support device with a displacement measurement device and the rotation support device with a load measurement device of the present invention configured as described above, an axial load acts between the stationary side member and the rotation side member. When the member and the rotation side member are relatively displaced in the axial direction, the pattern (for example, phase) of the output signal of at least one of the pair of sensors is changed according to the direction and magnitude of the relative displacement. It changes with the tendency different from the pattern of the output signal of the sensor. Therefore, if the output signals of these two sensors are compared (for example, if the phase difference between them is obtained), the relative displacement in the axial direction and the direction and magnitude of the axial load can be obtained based on the result.

In particular, in the case of the present invention, one detected surface is provided on each of the outer peripheral surface or inner peripheral surface of a pair of cylindrical portions constituting the encoder. Therefore, such an encoder of the present invention and the encoder of the previous invention in which a pair of detected surfaces are arranged in parallel in the axial direction on the outer peripheral surface or inner peripheral surface of one cylindrical portion, If the directional dimensions are the same, the encoder according to the present invention can reduce the axial dimension of the cylindrical portion provided with each of the detected surfaces to half that of the encoder according to the previous invention. In the case of the encoder of the present invention, the pair of cylindrical portions are arranged concentrically and overlapped in the radial direction, so that both the cylindrical portions are not bulky in the axial direction. Therefore, in the case of the present invention, it is possible to easily meet the demand for downsizing the encoder in the axial direction for installing the encoder in a narrow space.
In order to determine the axial load acting between the rotating side member and the stationary side member, it is not always necessary to determine the relative displacement amount between the rotating side member and the stationary side member. That is, the arithmetic unit directly calculates the axial load acting between the stationary member and the rotating member based on the output signals of the pair of sensors (without going through the process of obtaining the relative displacement). It can also have a function to do.

  When carrying out the present invention, for example, as described in claims 2 and 9, a first detected portion and a second detected portion having different characteristics on a pair of detected surfaces provided in the encoder, respectively. Are alternately arranged in the circumferential direction and at the same central angle pitch between the two detection surfaces. Then, the boundary between the first and second detected portions is inclined with respect to the axial direction of the encoder by different angles (including the case where the absolute values are the same and the directions are opposite) on the detected surfaces. .

When carrying out the inventions described in the second and ninth aspects, preferably, as described in the third and tenth aspects, each of the pair of cylindrical portions constituting the encoder is made of a magnetic material, The first detected portion is one of a recess, a through hole, and a notch, and the second detected portion is a portion that exists between the first detected portions adjacent in the circumferential direction. . In addition, the detection units of the pair of sensors are each composed of a combination of a magnetic sensing element and a permanent magnet, and one permanent magnet is shared as the permanent magnet that constitutes the detection unit of both sensors.
By adopting such a structure, the number of parts as a whole can be reduced, so that the cost can be reduced.

In carrying out the present invention, for example, as described in claims 4 and 11, the rotation side member is provided radially inward of the stationary side member, and the rotation side member or the rotation side member is fitted inside. The encoder can be supported and fixed to the fixed rotating shaft.
Further, for example, as described in claims 5 and 12, the stationary member can be a stationary wheel that is supported and fixed to a suspension device of an automobile, and the rotating member can be a hub that supports and fixes the wheel.
Further, as described in, for example, claims 6 and 13, based on the phase difference between the output signals of a pair of sensors, the relative displacement amount in the axial direction between the stationary member and the rotating member (direction and magnitude of relative displacement). It is also possible to provide an arithmetic unit for calculating (S).
Furthermore, when carrying out the invention of the rotation support device with a displacement measuring device of the present invention, for example, as described in claim 7, the computing unit is operated on the stationary side based on the calculated axial relative displacement amount. A function of calculating an axial load acting between the member and the rotation side member can be provided.

  1 to 9 show a first embodiment of the present invention corresponding to claims 1, 2, 4, 5, 6, 7, 8, 9, 11, 12, and 13. FIG. In the case of the present embodiment, the target rotation support device is a wheel support bearing unit for rotatably supporting the wheel of the automobile with respect to the suspension device. That is, as shown in FIG. 1, a hub 2 that is a rotating side member that supports and fixes a wheel is radially inward of an outer ring 1 that is a stationary side member that does not rotate while being supported by a suspension device. It is rotatably supported via rolling elements 3 and 3. Further, the inner end of the outer ring 1 ("inner" in the axial direction means the center side in the width direction of the vehicle when assembled to the automobile, and is the right side in Fig. 1. On the contrary, the outer side in the width direction of the vehicle. 1 is referred to as “outside” in the axial direction. The same applies throughout the present specification.) A bottomed cylindrical cover 6 is fitted and fixed, and the cover 6 opens the inner end opening of the outer ring 1. It is blocking. An annular encoder 4a is supported and fixed concentrically with the hub 2 at the inner end portion of the hub 2, and a pair of sensors 5a and 5a are provided at the radially outer end portion of the bottom plate portion of the cover 6. I support it.

  The encoder 4a is formed by combining a pair of annular members 7 and 8, each of which is formed into a ring shape by a magnetic metal plate such as a mild steel plate, as shown in FIGS. The outer end portions in the axial direction of the annular members 7 and 8 that are overlapped with each other in the radial direction are externally fitted and fixed to the inner end portion of the hub 2. In addition, a pair of cylindrical portions 9 and 10 are provided in the inner half of the annular members 7 and 8 in the axial direction so as to be concentric with each other and overlap in the radial direction. Then, the outer peripheral surfaces of these radially outer cylindrical portion 9 and radially inner cylindrical portion 10 (the portions shown in FIGS. 1 and 2 with diagonal grids) are respectively referred to as outer diameter detected surface 11 and The inner diameter side detection surface 12 is used. As shown in FIGS. 5 to 6, the outer diameter side detected surface 11 {(A) of FIGS. 5 to 6] and the inner diameter side detected surface 12 {(B) of FIGS. The convex portions 13a (13b) as the detected portions and the concave portions 14a (14b) as the second detected portions are alternately arranged at equal intervals (equal central angle pitch) in the circumferential direction. At the same time, the boundary between each projection 13a (13b) and each recess 14a (14b) is inclined by the same angle with respect to the axial direction of the encoder 4a. In the case of the present embodiment, the absolute value of the inclination angle of the boundary with respect to the axial direction is made equal between the outer diameter side detected surface 11 and the inner diameter side detected surface 12 {| θ | ( In the example shown in the drawing, the inclination direction (±) of the boundary with respect to the axial direction is reversed between the outer diameter side detected surface 11 and the inner diameter side detected surface 12. That is, the inclination angle of the boundary existing on the outer diameter side detection surface 11 is + θ, and the inclination angle of the boundary existing on the inner diameter side detection surface 12 is −θ. In addition, the center angle pitch at which the convex portions 13a (13b) and the concave portions 14a (14b) are alternately arranged in the circumferential direction is set to the outer diameter side detected surface 11 and the inner diameter side detected surface 12. Are equal to each other. Further, the phase of the circumferential arrangement of the convex portions 13a and 13b (the concave portions 14a and 14b) between the outer diameter side detected surface 11 and the inner diameter side detected surface 12 is shown in FIG. On the chain lines α, α, that is, the axially central portions of the outer diameter side detected surface 11 and the inner diameter side detected surface 12 are made to coincide with each other.

  Each of the sensors 5a and 5a has a detection unit 17 formed by combining a permanent magnet 16 and a magnetic detection element 15 such as a Hall IC, a Hall element, MR, or GMR. Then, the detection part 17 of the sensor 5a arranged radially outside is opposed to the outer diameter side detected surface 11, and the detection part 17 of the sensor 5a arranged radially inside is opposed to the inner diameter side detected surface 12, respectively. ing. In the case of the present embodiment, the positions where both the detection portions 17 and 17 face the outer diameter side detected surface 11 and the inner diameter side detected surface 12 are the same position in the circumferential direction of the encoder 4a. In other words, the detection units 17 and 17 are arranged on the same virtual plane including the central axis of the encoder 4a. Further, in a state where an axial load does not act between the outer ring 1 and the hub 2, the detection parts 17, 17 are the axially central parts of the outer diameter side detected surface 11 and the inner diameter side detected surface 12. The installation positions of the encoder 4a and the sensors 5a and 5a are restricted so as to face {on the chain lines α and α in Fig. 5}. The output signals of the sensors 5a and 5a can be sent to a calculator (not shown) provided on the vehicle body side through harnesses 18 and 18, respectively.

  In the case of the rotation support device with a displacement detection device (rotation support device with a load measuring device) of the present embodiment configured as described above, when an axial load acts between the outer ring 1 and the hub 2, both the sensors 5a. 5a is shifted in phase. That is, in a state where an axial load is not applied between the outer ring 1 and the hub 2, the detection portions 17 and 17 of the sensors 5a and 5a are shown by chain lines α and α in FIGS. That is, it faces the central part in the axial direction of the outer diameter side detected surface 11 and the inner diameter side detected surface 12. Accordingly, the phases of the output signals of the two sensors 5a and 5a coincide as shown in FIGS. Note that such an output result coincides with an output result obtained when the axial load is not applied in the above-described prior invention as shown in FIGS.

  On the other hand, when a downward axial load acts on the hub 2 that supports and fixes the encoder 4a in FIGS. 7A and 7A (the outer ring 1 and the hub 2 are relatively displaced in the axial direction). The detectors 17 and 17 of both the sensors 5a and 5a are located on the chain lines β and β in FIGS. 8A and 8A, that is, at portions where the deviations in the axial direction from the central portion in the axial direction are equal to each other. opposite. In this state, the phases of the output signals of the sensors 5a and 5a are shifted as shown in FIGS. Note that such an output result also coincides with the output result obtained when the axial load as described above in the previous invention is applied as shown in FIGS.

  Further, in the case where an upward axial load acts on the hub 2 supporting and fixing the encoder 4a in FIGS. 7A and 7A (the outer ring 1 and the hub 2 are relatively displaced in the axial direction), The detectors 17 and 17 of both the sensors 5a and 5a have the same displacement in the axial direction on the chain lines γ and γ in FIGS. 9A and 9A, that is, from the axial center. Opposite the part. In this state, the phases of the output signals of the two sensors 5a and 5a are shifted as shown in FIGS. Note that such an output result also coincides with the output result obtained when the axial load as described above in the previous invention is applied as shown in FIGS.

  Thus, in the case of the rotation support device with displacement measuring device (rotation support device with load measuring device) of the present embodiment, the phases of the output signals of both sensors 5a and 5a are the same as in the case of the previous invention. The direction of the axial load applied between the outer ring 1 and the hub 2 is shifted according to the direction. Further, the degree of displacement (displacement amount) of the output signals of the sensors 5a and 5a due to the axial load increases as the axial load increases. Therefore, in the case of the present embodiment, the output signals of both the sensors 5a and 5a are transmitted to the calculator through the harnesses 18 and 18, respectively. Then, with this calculator, the relative presence of the outer ring 1 and the hub 2 in the axial direction is determined based on the direction and magnitude of the output signal of the sensors 5a and 5a. Find the direction and magnitude of the displacement. At the same time, based on the direction and magnitude of the relative displacement, the direction and magnitude of the axial load acting between the outer ring 1 and the hub 2 are obtained. The acting direction and magnitude of the axial load can be obtained from the relative displacement or directly from the phase shift of the output signals of the sensors 5a and 5a. The frequency of the output signal of each of the sensors 5a and 5a varies according to the rotational speed of the encoder 4a and the hub 2. Therefore, in the case of the present embodiment, the rotational speed of the hub 2 is obtained by the computing unit based on the frequency of the output signal of at least one of the sensors 5a and 5a.

In the case of the rotation support device with a displacement measuring device (rotation support device with a load measuring device) of the present embodiment constructed and operated as described above, as shown in FIGS. One detected surface (the outer diameter side detected surface 11 or the inner diameter side detected surface 12) is provided on each of the outer peripheral surfaces of the pair of cylindrical portions 9 and 10 constituting 4a. On the other hand, as shown in FIGS. 7-9 (B) (a), in the case of the encoder 4 of the prior invention, a pair of detected surfaces 11, 12 are pivoted on the outer peripheral surface of one cylindrical portion 19. They are arranged in parallel in the direction. Therefore, when the widths of the detected surfaces 11 and 12 are made the same in the case of the present embodiment and the case of the prior invention, as shown in FIGS. In the case of A)}, the cylindrical portions 9, 10 (FIG. 1 to FIG. 1) constituting the encoder 4a of the present invention have the structure that can obtain the same output result as in the case of the previous invention {FIG. the axial dimension W _a of the part) to show 2 are denoted by the cross hatching, in comparison with the axial dimension W of the cylindrical portion 19 constituting the encoder 4 of the prior invention, the half size (W _a = W / 2). In the case of the encoder 4a of the present embodiment, the pair of cylindrical portions 9, 10 are arranged concentrically and overlapped in the radial direction, so that both the cylindrical portions 9, 10 are in the axial direction. There is nothing bulky. Therefore, in the case of the present embodiment, each of the cylindrical portions 9 and 10 can be installed in a narrow space between the hub 2 and the cover 6 and having a small axial dimension.

  Next, FIGS. 10 to 13 show a second embodiment of the present invention that also corresponds to the first, second, fourth, fifth, sixth, seventh, eighth, ninth, eleventh, twelfth and thirteenth aspects. In the case of the present embodiment, of the pair of cylindrical portions 9a and 10a constituting the encoder 4b, the outer diameter side detected surface 11 is provided on the inner peripheral surface of the radially outer cylindrical portion 9a, and the radially inner cylinder. An inner diameter side detection surface 12 is provided on the outer peripheral surface of the portion 10a. In the present embodiment, a pair of sensors are integrated as one sensor unit 20. And the detection parts 17 and 17 of each sensor provided in this sensor unit 20 are made to oppose the said outer diameter side detected surface 11 and the said inner diameter side detected surface 12 one by one. Further, the harness 18 that sends the output signals of the pair of sensors to a calculator (not shown) is also bundled into one. Other configurations and operations are the same as those of the first embodiment described above.

  Next, FIGS. 14 to 15 show a third embodiment of the present invention corresponding to claims 1 to 13. In the case of the present embodiment, one permanent magnet 16a is shared as a permanent magnet constituting the detection units 17a and 17b of the pair of sensors. Specifically, one detection unit 17a is configured by attaching the magnetic detection element 15 to the end face on the N pole side of the permanent magnet 16a, and another magnetic detection element 15 is attached to the end face on the S pole side. The other detection part 17b is comprised by providing. And by adopting such a configuration, the number of parts (the number of permanent magnets) is reduced and the cost is reduced. In the case of the present embodiment, the direction of the magnetic flux passing through each of the magnetic detection elements 15 and 15 is opposite to each other between the detection units 17a and 17b. For this reason, when an axial load is not acting between the outer ring 1 and the hub 2 (see FIG. 1), the phases of the output signals of the pair of sensors are opposite to each other. Other configurations and operations are the same as those of the second embodiment described above.

  When implementing the present invention, the encoder is not limited to those shown in the above embodiments, and various encoders can be adopted as long as the conditions described in the claims are satisfied. For example, encoders 4c to 4f having a cross-sectional shape as shown in FIGS. In this case, which one of the outer peripheral surface and the inner peripheral surface of the pair of cylindrical portions 9c to 9f, 10c to 10f arranged concentrically and overlapping in the radial direction is the detection surface? Can be arbitrarily determined. However, when determining, it should be noted that a sensor installation space is required in a portion facing the detected surface.

  Further, when a pair of cylindrical portions constituting the encoder is made of a magnetic material, as a pair of detected surfaces provided on the outer peripheral surface or inner peripheral surface of each cylindrical portion, for example, as shown in FIG. The first detected portion is the through hole 21a, 21b, the second detected portion is the column portion 22a, 22b, or the first detected portion is notched 23a, 23b as shown in FIG. It is also possible to adopt a configuration in which the two detection target portions are tongue pieces 24a and 24b. Further, as shown in FIG. 19, the first detected portion is made of N as a pair of detected surfaces provided on the outer peripheral surface or inner peripheral surface of each cylindrical portion. It is also possible to adopt a part magnetized in the pole and a part in which the second detected part is magnetized in the S pole. When the pair of cylindrical portions are made of permanent magnets in this way, no permanent magnet is incorporated on the pair of sensor sides.

  Further, in each of the above-described embodiments, the absolute value of the inclination angle of the boundary between the first detected portion (concave portion and the like) and the second detected portion (convex portion and the like) with respect to the axial direction of the encoder is calculated as one pair The detection surfaces are made equal (| θ |), and the inclination direction (±) of the boundary with respect to the axial direction of the encoder is reversed between the pair of detection surfaces. However, when carrying out the present invention, the absolute value of the inclination angle can be made different between the pair of detected surfaces. Further, when the absolute value of the tilt angle is made different between the pair of detected surfaces in this way, the tilt direction is made equal between the pair of detected surfaces, or any one of the detected surfaces. It is also possible not to incline the boundary of the detection surface with respect to the axial direction. In any case, when the stationary member and the rotating member are relatively displaced in the axial direction, the phases of the output signals of the pair of sensors are shifted from each other by an amount corresponding to the direction and magnitude of the relative displacement. I can do things. However, in order to ensure sufficient measurement sensitivity of the relative displacement amount and the applied load between the stationary side member and the rotating side member, the phase difference between the output signals of both sensors is set to the axial displacement. It is preferable to change the ratio at a high rate. Therefore, regardless of which configuration is used, the boundary between the detected surfaces of one of the detected surfaces should be changed so that the phase difference between the output signals of both sensors can be changed at a high rate with respect to the axial displacement. It is preferable to ensure a sufficient opening angle (angle difference) between the direction and the direction of the boundary existing on the other detected surface.

Sectional drawing which shows Example 1 of this invention. The A section enlarged view of FIG. The figure which looked at a pair of cylindrical part which comprises an encoder, and the detection part of a pair of sensor from the axial direction inner side. The B section enlarged view of FIG. (A) is a development view of the outer diameter side detection surface viewed from the X direction of FIG. 3, and (B) is a development view of the inner diameter side detection surface. (A) is a partial perspective view of an outer diameter side detected surface, (B) is a partial perspective view of an inner diameter side detected surface. It is a figure which shows the output result of a pair of sensor when an axial load is not added, Comprising: (A) is related with Example 1, (B) is related with prior invention. It is a figure which shows the output result of a pair of sensor in case an axial load is added to the predetermined direction, Comprising: (A) is related with Example 1, (B) is related with prior invention. It is a figure which shows the output result of a pair of sensor when an axial load is added to the reverse direction with respect to a predetermined direction, Comprising: (A) is related to Example 1, (B) is related to prior invention. The figure similar to FIG. 2 which shows Example 2 of this invention. Similarly, the same figure as FIG. The C section enlarged view of FIG. (A) is a partial perspective view of an outer diameter side detected surface, (B) is a partial perspective view of an inner diameter side detected surface. The figure similar to FIG. 3 which shows Example 3 of this invention. The D section enlarged view of FIG. Sectional drawing which shows other 4 examples of an encoder. The figure which shows a pair of to-be-detected surface which each arranges a through-hole and a pillar part alternately about the circumferential direction. The figure which shows a pair of to-be-detected surface which each arrange | positions a notch and a tongue piece alternately regarding the circumferential direction. The figure which shows a pair of to-be-detected surface which each arrange | positions N pole and S pole alternately with respect to the circumferential direction. Sectional drawing which shows the structure of a prior invention. The perspective view of the encoder integrated in the structure of this prior invention. Similarly development. The diagram which shows the output signal of the sensor which changes with the fluctuation | variation of an axial load.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Hub 3 Rolling element 4, 4a-4f Encoder 5, 5a Sensor 6 Cover 7 Annular member 8 Annular member 9, 9a-9f Cylindrical part 10, 10a-10f Cylindrical part 11 Outer diameter side detected surface 12 Inner diameter side covered Detection surface 13a, 13b Convex part 14a, 14b Concave part 15 Magnetic detection element 16, 16a Permanent magnet 17, 17a, 17b Detection part 18 Harness 19 Cylindrical part 20 Sensor unit 21a, 21b Through hole 22a, 22b Column part 23a, 23b Notch 24a, 24b tongue

Claims (13)

  The rotation support device includes a rotation support device and a displacement measurement device, and the rotation support device has a stationary side track on the stationary side circumferential surface, and a stationary side member that does not rotate during use, and a rotation side track on the rotation side circumferential surface. A rotation-side member that rotates when in use, and a plurality of rolling elements that are rotatively provided between the rotation-side track and the stationary-side track. The encoder includes a pair of sensors, and the encoder includes a pair of cylindrical portions disposed concentrically and overlapping in the radial direction, and an outer peripheral surface or an inner peripheral surface of each cylindrical portion. Each of the detected surfaces is concentrically supported and fixed to the rotating side member or a portion that rotates in synchronization with the rotating side member. And alternately changing at least one of The characteristic change pattern related to the circumferential direction of the exit surface is gradually changed with a tendency different from that of the other detected surface over the axial direction that is the direction of displacement to be measured. The detection part of one sensor is opposed to a part in the axial direction of one of the detected surfaces of the pair of detection surfaces, and the detection part of the other sensor is made to face a part in the axial direction of the other detection surface. It is supported by a portion that does not rotate even when used in a state in which it is used, and the pattern of the output signal is changed corresponding to the characteristic change pattern of any of the above-described detected surfaces, each facing its own detection unit. Rotary support device with displacement measuring device.   A first detected portion and a second detected portion having different characteristics from each other on a pair of detected surfaces provided in the encoder are alternately in the circumferential direction, and the detected surfaces are equal to each other. The first and second detected portions are arranged at a central angle pitch, and the boundaries of the first and second detected portions are inclined by different angles between the two detected surfaces with respect to the axial direction of the encoder. The rotation support device with the displacement measuring device described.   Each of the pair of cylindrical portions constituting the encoder is made of a magnetic material, the first detected portion is one of a recess, a through hole, and a notch, and the second detected portion is adjacent in the circumferential direction. The first detection target portions that are in the same position, and the detection portions of the pair of sensors are each composed of a combination of a magnetic sensing element and a permanent magnet, and the detection of these two sensors. The rotation support device with a displacement measuring device according to claim 2, wherein one permanent magnet is shared as the permanent magnet constituting the part.   The rotation-side member is provided radially inward of the stationary-side member, and the encoder is supported and fixed to the rotation-side member or a rotation shaft fitted and fixed to the rotation-side member. The rotation support apparatus with a displacement measuring device described in any one of them.   The rotation with a displacement measuring device according to any one of claims 1 to 4, wherein the stationary member is a stationary wheel that is supported and fixed to a suspension device of an automobile, and the rotating member is a hub that supports and fixes the wheel. Support device.   6. The computing device according to claim 1, further comprising an arithmetic unit that calculates a relative displacement amount in the axial direction between the stationary member and the rotating member based on a phase difference between the output signals of the pair of sensors. The rotation support device with a displacement measuring device described in 1.   The arithmetic unit has a function of calculating an axial load acting between the stationary member and the rotating member based on the calculated axial relative displacement amount. Rotating support device.   The rotary support device includes a rotary support device and a load measuring device, and the rotary support device has a stationary side track on the stationary side peripheral surface, and a stationary side member that does not rotate during use, and a rotary side track on the rotary side peripheral surface. And a rotating side member that rotates when in use, and a plurality of rolling elements provided between the rotating side track and the stationary side track so as to be freely rollable. The encoder includes a pair of sensors, and the encoder includes a pair of cylindrical portions disposed concentrically and overlapping in the radial direction, and an outer peripheral surface or an inner peripheral surface of each cylindrical portion. Each of the detected surfaces is concentrically supported and fixed to the rotating side member or a portion that rotates in synchronization with the rotating side member. And alternately changing at least one of The characteristic change pattern related to the circumferential direction of the exit surface is gradually changed with a tendency different from that of the other detected surface over the axial direction that is the direction of displacement to be measured. The detection part of one sensor is opposed to a part in the axial direction of one of the detected surfaces of the pair of detection surfaces, and the detection part of the other sensor is made to face a part in the axial direction of the other detection surface. It is supported by a portion that does not rotate even when used in a state in which it is used, and the pattern of the output signal is changed corresponding to the characteristic change pattern of any of the above-described detected surfaces, each facing its own detection unit. Rotating support device with load measuring device.   A first detected portion and a second detected portion having different characteristics from each other on a pair of detected surfaces provided in the encoder are alternately in the circumferential direction, and the detected surfaces are equal to each other. It is arranged at a central angle pitch, and the boundary between the first and second detected parts is inclined with respect to the axial direction of the encoder by different angles between the detected surfaces. The rotation support device with the load measuring device described.   Each of the pair of cylindrical portions constituting the encoder is made of a magnetic material, the first detected portion is one of a recess, a through hole, and a notch, and the second detected portion is adjacent in the circumferential direction. The first detection target portions that are in the same position, and the detection portions of the pair of sensors are each composed of a combination of a magnetic sensing element and a permanent magnet, and the detection of these two sensors. The rotation support device with a load measuring device according to claim 9, wherein one permanent magnet is shared as the permanent magnet constituting the part.   The rotation-side member is provided radially inward of the stationary-side member, and an encoder is supported and fixed to the rotation-side member or a rotation shaft fitted and fixed to the rotation-side member. The rotation support apparatus with a load measuring apparatus described in any one of them.   The rotation with a load measuring device according to any one of claims 8 to 11, wherein the stationary side member is a stationary wheel that is supported and fixed to a suspension device of an automobile, and the rotating side member is a hub that supports and fixes the wheel. Support device.   The calculator according to any one of claims 8 to 12, further comprising: an arithmetic unit that calculates an axial load acting between the stationary member and the rotating member based on a phase difference between output signals of the pair of sensors. The rotation support device with a load measuring device described in 1.

Images