WO2023219050A1 - Sensor device - Google Patents
Sensor device Download PDFInfo
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- WO2023219050A1 WO2023219050A1 PCT/JP2023/017223 JP2023017223W WO2023219050A1 WO 2023219050 A1 WO2023219050 A1 WO 2023219050A1 JP 2023017223 W JP2023017223 W JP 2023017223W WO 2023219050 A1 WO2023219050 A1 WO 2023219050A1
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- WIPO (PCT)
- Prior art keywords
- bearing
- holder
- sensor device
- strain gauge
- shaft
- Prior art date
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- 230000002093 peripheral effect Effects 0.000 claims description 44
- 230000005540 biological transmission Effects 0.000 claims description 19
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000007704 transition Effects 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000036316 preload Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/067—Fixing them in a housing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
Definitions
- the present invention relates to a sensor device.
- Optical sensor devices and magnetic sensor devices are known as sensor devices for detecting the rotation angle of a rotating body.
- An optical sensor device is disclosed in Patent Document 1, for example.
- a magnetic sensor device is disclosed in Patent Document 2, for example.
- Optical sensor devices and magnetic sensor devices are easily affected by the environment, such as contamination by dust and surrounding magnetism, so there is a need for sensor devices with higher environmental resistance.
- An example of the present invention is to provide a sensor device with excellent environmental resistance.
- the sensor device of the present invention includes a shaft, a bearing having an inner circumferential side and an outer circumferential side, and a strain gauge attached to the outer circumferential side of the bearing directly or via another member.
- the shaft is disposed inside the inner peripheral side of the bearing, and the bearing and the shaft are eccentric with respect to each other.
- FIG. 1 is a sectional view of a sensor device according to a first embodiment, which is an example of the present invention.
- FIG. 1 is a plan view of a sensor device according to a first embodiment, which is an example of the present invention.
- FIG. 3 is a sectional view of a sensor device according to a second embodiment, which is an example of the present invention.
- FIG. 7 is a plan view of a sensor device according to a second embodiment, which is an example of the present invention.
- FIG. 7 is a sectional view of a sensor device according to a third embodiment, which is an example of the present invention.
- FIG. 7 is a cross-sectional view of a sensor device according to a fourth embodiment, which is an example of the present invention.
- FIG. 1 is a plan view of a sensor device according to a first embodiment, which is an example of the present invention.
- FIG. 3 is a sectional view of a sensor device according to a second embodiment, which is an example of the present invention.
- FIG. 7 is a perspective view of a holder and a strain gauge of a sensor device according to a fifth embodiment, which is an example of the present invention.
- FIG. 7 is a sectional view of a sensor device according to a fifth embodiment, which is an example of the present invention.
- the direction of arrow a along the axis X (the central axis of the shaft S) is referred to as the upper side or one side in the axial direction.
- the direction of arrow b along axis X is defined as the lower side or the other axial side.
- the direction of arrow ab is referred to as an up-down direction or an axial direction.
- the vertical direction does not necessarily match the vertical direction.
- the direction of the arrow cd is referred to as the radial direction
- the direction of the arrow c away from the axis X is referred to as the outer side or one side in the radial direction
- the direction of the arrow d approaching the axis X is referred to as the inner side or the other side in the radial direction
- the direction along the tangent of the circle around the axis X is referred to as the tangential direction.
- FIG. 1 is a cross-sectional view of a sensor device 100 according to this embodiment.
- FIG. 2 is a plan view of the sensor device 100.
- the sensor device 100 includes a shaft S, a bearing 101 having an inner circumferential side 101a and an outer circumferential side 101b, and a strain gauge 102 attached to the outer circumferential side 101b of the bearing 101 via a holder 104.
- the bearing 101 is a ball bearing having an inner ring 101i, an outer ring 101o, and rolling elements. Note that the bearing 101 is not limited to a ball bearing, and may be various other bearings such as a sleeve bearing.
- the shaft S is a cylindrical member extending in the axial direction. As shown in FIGS. 1 and 2, in the radial direction, the shaft S is disposed inside the inner peripheral side 101a of the bearing 101 (the other radial side, in the direction of arrow d). In the axial direction, the lower end (the other axial side, the direction of arrow b) of the shaft S projects from the through hole 11 of the external device 10 to the outside of the external device 10 .
- An eccentric member 103 whose axial dimension is the same or substantially the same as that of the bearing 101 is arranged between the inner peripheral side 101a of the bearing 101 and the shaft S. The eccentric member 103 makes the bearing 101 and the shaft S eccentric to each other. In other words, the eccentric member 103 makes the bearing 101 eccentric with respect to the shaft S.
- the eccentric member 103 is a cylindrical member extending in the axial direction, and has a cylindrical through hole having an inner diameter that is the same or substantially the same as the outer diameter (diameter) of the shaft S. That is, the eccentric member 103 is an annular member. In the eccentric member 103, the central axis of the outer circumferential surface (the radially outer surface (radially one side, direction of arrow c)) and the center axis of the inner circumferential surface (radially inner surface) do not coincide. Therefore, the eccentric member 103 has a maximum thickness portion 103a having the maximum thickness in the radial direction and a minimum thickness portion 103b having the minimum thickness in the radial direction.
- the shaft S is bonded or press-fitted to the inner circumferential surface (radially inner surface) of the eccentric member 103. Thereby, the shaft S is fixed integrally with the eccentric member 103.
- the inner ring 101i of the bearing 101 is bonded or press-fitted to the outer peripheral surface (radially outer surface) of the eccentric member 103. Thereby, the inner ring 101i of the bearing 101 is fixed to the eccentric member 103.
- the axis X which is the central axis of the shaft S, is shifted from the central axis Y of the eccentric member 103 and the bearing 101, so that the bearing 101 and the shaft S have an eccentric positional relationship with respect to each other.
- each holder 104 In the radial direction, on the outside of the bearing 101, there are four holders 104 that are approximately L-shaped in side view and are arranged at positions that overlap when rotated by 90 degrees around the axis X and have rotational symmetry (hereinafter referred to as "4-fold symmetry"). is located. Each holder 104 is in contact with the outer peripheral side 101b of the bearing 101. In this way, each holder 104 holds a bearing 101.
- the bearing 101 is arranged above (on one side in the axial direction, in the direction of arrow a) than a fixing part 143, which will be described later.
- Each holder 104 holds a strain gauge 102. That is, the sensor device 100 has a first strain gauge 102a held in a first holder 104a, a second strain gauge 102b held in a second holder 104b, and a third holder 104c in a clockwise direction when viewed from above. It has a total of four strain gauges 102, including a third strain gauge 102c held (hidden in FIG. 2) and a fourth strain gauge 102d held in a fourth holder 104d.
- Two strain gauges 102 adjacent in the circumferential direction are arranged at symmetrical positions with respect to a certain plane containing the axis X.
- the angle between the direction from the axis X toward the first strain gauge 102a and the direction from the axis X toward the second strain gauge 102b is 90 degrees. Since all four holders 104 have the same configuration, only one holder 104 will be described in detail hereafter, and detailed description of the other holders 104 will be omitted unless necessary.
- the holder 104 includes a rectangular plate portion 141 extending in the axial direction, and a rectangular plate portion 141 extending radially outward from the lower end of the plate portion 141 in the axial direction. It has a fixed part 143 having a shape. In the radial direction, a recess 144 that is semicircular in side view and extends in the tangential direction is formed on the inner surface of the plate portion 141 . The recessed portion 144 is formed in the plate portion 141 slightly downward from the center in the axial direction.
- the wall thickness of the portion where the recessed portion 144 is formed is thinner, and becomes an elastic portion 142 that can undergo elastic strain deformation.
- Strain gauge 102 is attached to the radially outer surface of elastic portion 142 . Strain deformation of the elastic portion 142 can be detected as a change in the resistance value of the strain gauge 102.
- the outer peripheral side 101b of the bearing 101 is in contact with the axially inner surface of the plate portion 141 at a portion above the recess 144.
- the strain gauge 102 is installed so as to be able to detect strain in the elastic portion 142 in a direction along a plane perpendicular to the tangential direction. That is, the strain gauge 102 is attached to the elastic portion 142 such that the grid orientation (typically, the longitudinal direction of the strain gauge) is in the axial direction.
- a circular through hole 143h is formed near the center of the fixing part 143 of the holder 104.
- the holder 104 is fixed to the external device 10 via a spacer 106 by a bolt 105 inserted into the through hole 143h.
- the maximum thickness portion 103a of the eccentric member 103 is located close to the third holder 104c, and the minimum thickness portion 103b of the eccentric member 103 is located close to the first holder 104a. Therefore, the plate portion 141 of the third holder 104c is pressed radially outward by the bearing 101. Note that the respective plate portions 141 of the second holder 104b and the fourth holder 104d adjacent to the third holder 104c are also slightly pressed radially outward by the bearing 101.
- the elastic portion 142 of the third holder 104c has undergone the largest strain deformation, and the upper side of the plate portion 141 in the axial direction is warped toward the outside in the radial direction. ing.
- the elastic portions 142 of the second holder 104b and the fourth holder 104d adjacent to the third holder 104c are in a slightly strained state.
- the elastic portion 142 of the first holder 104a is in a state where it is least strained or not strained at all.
- the eccentric member 103 fixed to the shaft S also rotates, and the central axis Y of the bearing 101 also rotates around the axis X accordingly.
- the central axis Y of the bearing 101 rotates around the axis X in a clockwise direction in a plan view.
- the elastic portion 142 of the fourth holder 104d transitions to a state in which it is most strained. .
- the bearing 101 and the shaft S are attached eccentrically to each other.
- the inner ring 101i of the bearing 101 rotates eccentrically with respect to the shaft S, and the rotation angle can be detected by the strain gauge 102 attached to the outer peripheral side 101b of the bearing 101 via the holder 104. ing. Since the sensor device 100 according to the present embodiment does not use an optical or magnetic sensor, it is hardly affected by contamination by dust or the like or by surrounding magnetism. Therefore, the sensor device 100 according to this embodiment has excellent environmental resistance.
- the eccentric member 103 of the sensor device 100 according to the present embodiment is an annular member, it has excellent strength and has a long life compared to a case where a wedge or the like is used. Further, the sensor device 100 according to the present embodiment has a plurality of strain gauges 102 including a first strain gauge 102a and a second strain gauge 102b, and the first strain gauge 102a and the second strain gauge 102b is arranged at a symmetrical position with respect to a plane containing the central axis (axis The angle formed by the direction toward is 90°. Therefore, the sensor device 100 according to this embodiment can detect the rotation angle of the shaft S with higher accuracy.
- FIG. 3 is a cross-sectional view of sensor device 200 according to this embodiment.
- FIG. 4 is a plan view of the sensor device 200.
- the sensor device 200 has the same configuration as the sensor device 100 according to the first embodiment, except that it includes a holder 204 instead of the holder 104.
- members and components having the same functions and configurations as those in the first embodiment will be designated by the same reference numerals as in the first embodiment, and detailed description thereof will be omitted.
- the sensor device 200 includes a shaft S, a bearing 101 having an inner circumferential side 101a and an outer circumferential side 101b, and a strain gauge 102 attached to the outer circumferential side 101b of the bearing 101 via a holder 204.
- annular holder 204 having an L-shape in cross section is arranged outside the bearing 101.
- the holder 204 is in contact with the outer peripheral side 101b of the bearing 101. In this way, the holder 204 holds the bearing 101.
- the bearing 101 is arranged above a fixed portion 243, which will be described later, in the axial direction.
- the holder 204 holds the four strain gauges 102 at four-fold symmetrical positions around the axis X in an unstrained state. That is, the sensor device 200 includes, in clockwise plan view, a first strain gauge 102a, a second strain gauge 102b, a third strain gauge 102c (hidden in FIG. 4), and a fourth strain gauge 102d. It has four strain gauges 102.
- Two strain gauges 102 adjacent in the circumferential direction are arranged at symmetrical positions with respect to a plane containing the axis X.
- the angle between the direction from the axis X toward the first strain gauge 102a and the direction from the axis X toward the second strain gauge 102b is 90 degrees.
- the holder 204 includes a cylindrical portion 241 that extends in the axial direction, and four plate-shaped plates that are rectangular in plan view and extend radially outward from the lower end of the cylindrical portion 241 in the axial direction. It has a fixed part 243.
- the four fixing parts 243 are arranged at four-fold symmetrical positions around the axis X.
- an annular recess 244 having a semicircular cross section is formed on the inner circumferential surface (radially inner surface) 241a of the cylindrical portion 241.
- the recess 244 is formed in the cylindrical portion 241 slightly downward from the axial center.
- the portion where the recess 244 is formed has a thinner wall thickness, and is an elastic portion 242 that can undergo elastic strain deformation.
- Strain gauge 102 is attached to the radially outer surface of elastic portion 242 . Strain deformation of the elastic portion 242 can be detected as a change in the resistance value of the strain gauge 102.
- the outer circumferential side 101b of the bearing 101 is in contact with the inner circumferential surface 241a of the cylindrical portion 241 at a portion above the position where the strain gauge 102 is attached.
- the strain gauge 102 is installed so that it can detect strain in the elastic portion 242 in a direction along a plane perpendicular to the tangential direction. That is, the strain gauge 102 is attached to the elastic portion 242 such that the grid orientation (typically, the longitudinal direction of the strain gauge) is in the axial direction.
- a circular through hole 243h is formed near the center of the fixing part 243 of the holder 204.
- the holder 204 is fixed to the external device 10 via the spacer 106 by a bolt 105 inserted into the through hole 243h.
- the maximum thickness portion 103a of the eccentric member 103 is located close to the third strain gauge 102c, and the minimum thickness portion 103b of the eccentric member 103 is located close to the first strain gauge 102a. . Therefore, the cylindrical portion 241 of the holder 204 is pressed radially outward by the bearing 101 on the side where the third strain gauge 102c is attached. Note that the side of the cylindrical portion 241 of the holder 204 to which the second strain gauge 102b and the fourth strain gauge 102d are attached is also slightly pressed radially outward by the bearing 101.
- the side of the elastic portion 242 of the holder 204 to which the third strain gauge 102c is attached is subjected to the largest strain deformation, and the axially upper side of the cylindrical portion 241 is radially outward. It is in a state where it is curved towards.
- the side of the elastic portion 242 of the holder 204 to which the second strain gauge 102b and the fourth strain gauge 102d are attached is in a slightly deformed state.
- the side of the elastic portion 242 of the holder 204 to which the first strain gauge 102a is attached is in a state where it is least strain-deformed.
- the eccentric member 103 fixed to the shaft S also rotates, and the central axis Y of the bearing 101 also rotates around the axis X accordingly.
- the central axis Y of the bearing 101 rotates around the axis X in a clockwise direction in a plan view.
- the central axis Y of the bearing 101 rotates 90° clockwise in plan view from the state shown in FIG. Transition to the state where
- the elastic portion 242 of the holder 204 sequentially The side to which the third strain gauge 102c is attached, the side to which the fourth strain gauge 102d is attached, the side to which the first strain gauge 102a is attached, and the side to which the second strain gauge 102b is attached have the highest strain. Transition to a transformed state. Therefore, the rotation angle of the shaft S can be detected by the four strain gauges 102 attached to the holder 204.
- the sensor device 200 according to the present embodiment similarly has the characteristics described above for the sensor device 100 according to the first embodiment.
- the holder 204 is composed of one member, so it is superior in strength, the strain gauge 102 can be easily positioned, and the sensor device 200 can be easily attached to an external device. It's easy.
- FIG. 5 is a cross-sectional view of sensor device 300 according to this embodiment.
- the sensor device 300 has the same configuration as the sensor device 100 according to the first embodiment, except that an eccentric member 303 is provided instead of the eccentric member 103.
- members and components having the same functions and configurations as those in the first embodiment will be designated by the same reference numerals as in the first embodiment, and detailed description thereof will be omitted.
- An eccentric member 303 is arranged between the inner peripheral side 101a of the bearing 101 and the shaft S.
- the eccentric member 303 makes the bearing 101 and the shaft S eccentric to each other.
- the eccentric member 303 makes the bearing 101 eccentric with respect to the shaft S.
- the eccentric member 303 is a wedge having a substantially right triangular shape in cross section.
- the eccentric member 303 has a shape in which the radial dimension becomes smaller toward the lower side, and in the axial direction, the eccentric member 303 is inserted from the upper side of the bearing 101 toward the lower side. .
- the eccentric member 303 has a shape in which the radial dimension becomes smaller as it goes upward; It may be inserted.
- the radially inner surface of the eccentric member 303 is bonded or press-fitted to the outer circumferential surface (radially outer surface) of the shaft S. Thereby, the eccentric member 303 is integrally fixed to the shaft S.
- the inner ring 101i of the bearing 101 is bonded or press-fitted to the radially outer surface of the eccentric member 303. Thereby, the inner ring 101i of the bearing 101 is fixed to the eccentric member 303.
- the eccentric member 303 is located close to the third holder 104c. Therefore, the plate portion 141 of the third holder 104c is pressed radially outward by the bearing 101. Note that the respective plate portions 141 of the second holder 104b and the fourth holder 104d adjacent to the third holder 104c are also slightly pressed radially outward by the bearing 101.
- the elastic portion 142 of the third holder 104c has undergone the largest strain deformation, and the axially upper side of the plate portion 141 is warped radially outward.
- the elastic portions 142 of the second holder 104b and the fourth holder 104d adjacent to the third holder 104c are in a slightly strained state.
- the elastic portion 142 of the first holder 104a is in a state where it is least strained or not strained at all.
- the eccentric member 303 fixed to the shaft S also rotates, and the central axis Y of the bearing 101 also rotates around the axis X accordingly.
- the central axis Y of the bearing 101 rotates around the axis X in a clockwise direction in a plan view.
- the elastic portion 142 of the fourth holder 104d transitions to a state in which it is most strained.
- the sensor device 300 according to the present embodiment similarly has the characteristics described above for the sensor device 100 according to the first embodiment.
- the sensor device 300 according to this embodiment is lightweight because the eccentric member 303 is a wedge.
- FIG. 6 is a cross-sectional view of sensor device 400 according to this embodiment.
- the sensor device 400 has the same configuration as the sensor device 100 according to the first embodiment, except that it includes a holder 404 instead of the holder 104.
- members and components having the same functions and configurations as those in the first embodiment will be designated by the same reference numerals as in the first embodiment, and detailed description thereof will be omitted.
- the sensor device 400 includes a shaft S, a bearing 101 having an inner circumferential side 101a and an outer circumferential side 101b, and a strain gauge 102 attached to the outer circumferential side 101b of the bearing 101 via a holder 404.
- each holder 404 In the radial direction, on the outside of the bearing 101, four holders 404 that are approximately L-shaped in side view are arranged at four-fold symmetrical positions around the axis X. Each holder 404 is in contact with the outer peripheral side 101b of the bearing 101 via a radially inner tip portion 445a of a transmission portion 445, which will be described later. In this way, each holder 404 holds the bearing 101. Note that the bearing 101 is arranged above a fixed portion 143, which will be described later, in the axial direction.
- Each holder 404 holds a strain gauge 102. That is, the sensor device 400 has a first strain gauge 102a held by a first holder 404a, a second strain gauge 102b held by a second holder 404b, and a third holder 404c in a clockwise direction when viewed from above. It has a total of four strain gauges 102, including a third strain gauge 102c held and a fourth strain gauge 102d held by a fourth holder 404d.
- Two strain gauges 102 adjacent in the circumferential direction are arranged at symmetrical positions with respect to a plane containing the axis X.
- the angle between the direction from the axis X toward the first strain gauge 102a and the direction from the axis X toward the second strain gauge 102b is 90°. Since all four holders 404 have the same configuration, only one holder 404 will be explained in detail hereafter, and detailed explanations of the other holders 404 will be omitted unless necessary.
- the holder 404 includes a rectangular plate portion 441 extending in the axial direction, and a rectangular plate portion 441 extending radially outward from the lower end of the plate portion 441 in the axial direction. It has a fixed part 143 having a shape. In the radial direction, a recess 144 that is semicircular in side view and extends in the tangential direction is formed on the inner surface of the plate portion 441 . The recessed portion 144 is formed in the plate portion 441 slightly downward from the axial center.
- the portion where the concave portion 144 is formed has a thinner wall thickness, and serves as an elastic portion 142 that can undergo elastic strain deformation.
- Strain gauge 102 is attached to the radially outer surface of elastic portion 142 . Strain deformation of the elastic portion 142 can be detected as a change in the resistance value of the strain gauge 102.
- An opening 441h which is a circular hole penetrating in the radial direction, is formed in the central portion of the plate portion 441 in the tangential direction and above the recess 144 in the axial direction.
- a pin-shaped transmission section 445 is inserted into the opening 441h. The transmission portion 445 is fixed to the opening 441h by adhesive or press fitting.
- the transmission section 445 has a pointed tip 445a.
- the transmission portion 445 is arranged such that the distal end portion 445a protrudes further inward than the plate portion 441 in the radial direction.
- the outer peripheral side 101b of the bearing 101 is in point contact with the tip end 445a of the transmission section 445. Therefore, the transmission portion 445 can transmit the displacement of the bearing 101 to the holder 404 via the tip portion 445a.
- the eccentric member 103 fixed to the shaft S also rotates, and the central axis Y of the bearing 101 also rotates around the axis X accordingly.
- the central axis Y of the bearing 101 rotates around the axis X in a clockwise direction in a plan view.
- the elastic portion 142 of the fourth holder 404d transitions to a state in which it is most strained.
- the sensor device 400 according to this embodiment similarly has the characteristics described above for the sensor device 100 according to the first embodiment.
- the sensor device 400 according to the present embodiment has a transmission section 445, and the outer peripheral side 101b of the bearing 101 is in contact with the tip 445a of the transmission section 445. Therefore, according to the sensor device 400 according to the present embodiment, it is possible to detect the displacement of the bearing 101 as a point, and the detection accuracy of the rotation angle of the shaft S is improved.
- the point pressed by the bearing 101 when the holder 404 is strain-deformed is always constant regardless of the rotation angle of the shaft S. Also from this, according to the sensor device 400 according to the present embodiment, the detection accuracy of the rotation angle of the shaft S is improved.
- FIG. 7 is a perspective view of holder 504, strain gauge 102, and strain sensor 603 of sensor device 500 according to this embodiment.
- FIG. 8 is a cross-sectional view of sensor device 500 according to this embodiment.
- the sensor device 500 has a structure in which a torque sensor 600 is integrated and arranged below the sensor device 400 according to the fourth embodiment in the axial direction.
- members and parts having the same functions and configurations as those in the first and fourth embodiments will be given the same reference numerals as in the first and fourth embodiments, and detailed explanations thereof will be omitted. .
- the sensor device 500 includes a shaft S, a first bearing 501 having an inner circumferential side 501a and an outer circumferential side 501b, a strain gauge 102 attached to the outer circumferential side 501b of the first bearing 501 via a holder 504, and a torque It has a sensor 600. Since the holder 504 is integrally formed with the holder of the torque sensor 600, the holder of the torque sensor 600 will also be referred to as the holder 504 using the same reference numeral. In addition to the holder 504, the torque sensor 600 includes a second bearing 602 and a strain sensor 603.
- the first bearing 501 is a ball bearing having an inner ring 501i, an outer ring 501o, and rolling elements.
- the second bearing 602 is a ball bearing having an inner ring 602i, an outer ring 602o, and rolling elements.
- the first bearing 501 and the second bearing 602 are not limited to ball bearings, and may be various other bearings such as sleeve bearings.
- the first bearing 501 is arranged above the second bearing 602 with a space therebetween.
- the configuration of the first bearing 501 is the same as the configuration of the bearing 101 of the sensor device 100 according to the first embodiment.
- the holder 504 has a substantially square cylindrical shape in plan view, and includes an inner circumferential member 610 and an outer circumferential member 620.
- the inner circumferential member 610 is a cylindrical member having a cylindrical inner circumferential surface 610a around the axis X and extending in the axial direction.
- the outer circumferential member 620 is a member disposed outside the inner circumferential member 610 in the radial direction.
- the dimensions of the inner peripheral member 610 are the same as the dimensions of the outer peripheral member 620.
- the axially upper end surface and the axially lower end surface of the inner peripheral member 610 are on the same plane as the axially upper end surface and the axially lower end surface of the outer peripheral member 620, respectively.
- four connecting portions 630 having a generally rectangular shape in plan view protrude radially outward from the inner circumferential member 610.
- the four connecting parts 630 are arranged at four-fold symmetrical positions around the axis X.
- a strain body 621 having a rectangular shape in plan view and a substantially L-shape in side view is connected to each connection portion 630.
- the strain body 621 is a deformable portion that deforms by receiving stress, and deforms elastically or plastically by receiving stress.
- the four strain bodies 621 constitute the outer peripheral member 620 in this embodiment. Therefore, the connecting portion 630 connects the inner peripheral member 610 and the outer peripheral member 620. Since all four strain bodies 621 have the same configuration, only one strain body 621 will be described in detail hereafter, and detailed explanations of the other strain bodies 621 will be omitted.
- the strain body 621 (outer peripheral member 620) faces the inner peripheral member 610 with a gap 640 extending in the tangential direction.
- the gap 640 connects to the through hole 641, which is circular or approximately circular in side view, on the axially lower side of the through hole 641 and slightly inward in the radial direction, and has a width (radial width) smaller than the diameter of the through hole 641. narrow slit 642.
- a concave portion recessed radially outward is formed in the radially inner surface of the strain body 621 (outer peripheral member 620), and the connecting portion 630 has a recessed portion recessed toward the radially outer side.
- a recess that is recessed upward in the axial direction is formed in the lower surface, and a recess that is recessed inward in the radial direction is formed in the inner peripheral member 610 on the outer surface in the radial direction.
- the strain body 621 (outer peripheral member 620) has a second elastic portion 622. That is, a portion of the strain body 621 (outer peripheral member 620) functions as the elastic portion 622. Of the portion of the strain body 621 extending along a plane perpendicular to the radial direction, a region slightly above the center in the axial direction (the region in which the recess is formed) is the second elastic portion 622. It becomes. In the radial direction, the second elastic portion 622 and the inner peripheral member 610 face each other with a gap 640 in between. The second elastic portion 622 has a radially recessed portion on a surface facing the inner peripheral member 610.
- the second elastic portion 622 Due to the formation of the concave portion, the second elastic portion 622 has a thinner wall thickness (thickness in the radial direction) than other portions of the strain body 621 (outer peripheral member 620), and has elasticity. Strain deformation is more likely to occur.
- the torque sensor 600 includes a plurality (four in this embodiment) of second elastic portions 622 as a whole.
- the plurality of second elastic portions 622 are arranged in four-fold symmetrical positions in line on the outside of the holder 504 (radially outside the inner peripheral member 610) in the circumferential direction (FIG. 7).
- a strain sensor 603 is attached to the radially outer surface of the second elastic portion 622.
- the second elastic portion 622 and the strain sensor 603 each extend along a plane parallel to the axial direction.
- the strain sensor 603 is installed so as to be able to detect strain in the second elastic portion 622 in a direction along a plane perpendicular to the tangential direction. Therefore, when the strain sensor 603 is a strain gauge, it is attached to the second elastic portion 622 such that the grid orientation (typically, the longitudinal direction of the strain gauge) is in the axial direction.
- the strain sensor 603 is a strain gauge, the strain in the second elastic portion 622 is detected as a change in resistance value.
- a fixing portion 623 connected to the external device 10 is arranged outside the second elastic portion 622 of the strain body 621 in the radial direction.
- the fixing portion 623 is a rectangular plate-shaped portion extending radially outward from the axially lower end of the second elastic portion 622 .
- a circular through hole 623h is formed near the center of the fixing portion 623.
- the strain body 621 is fixed to the external device 10 via a spacer 605 by a bolt 604 inserted into the through hole 623h. Thereby, the entire holder 504 is fixed to the external device 10.
- the second bearing 602 is arranged inside the inner peripheral member 610 of the holder 504.
- the second bearing 602 is held by an inner peripheral member 610 of the holder 504.
- the inner ring 602i of the second bearing 602 is bonded or press-fitted to the outer circumferential surface (radially outer surface) of the cylindrical shaft S. Thereby, the inner ring 602i of the second bearing 602 is fixed to the shaft S.
- the outer ring 602o of the second bearing 602 is press-fitted into the inner peripheral surface 610a of the inner peripheral member 610 of the holder 504.
- the second bearing 602 rotatably supports the shaft S with respect to the holder 504.
- the lower end of the shaft S in the axial direction projects from the through hole 11 of the external device 10 to the outside of the external device 10 .
- the holder 504 has an annular contact portion 611 that protrudes radially inward at the lower end in the axial direction.
- the contact portion 611 protrudes radially inward from the inner peripheral member 610 of the holder 504.
- the contact portion 611 is in contact with the axially lower end surface of the outer ring 602o of the second bearing 602. Thereby, the contact portion 611 supports the second bearing 602 in a state in which downward movement in the axial direction is restricted.
- a recess 612 that is semicircular or approximately semicircular in side view is formed near the axially lower end of the inner circumferential surface 610a of the inner circumferential member 610.
- the recess 612 is formed in an annular shape around the axis X above the contact portion 611 in the axial direction.
- the axially lower end of the concave surface of the recessed portion 612 is smoothly connected to the axially upper end surface of the contact portion 611 .
- the shaft S is a crankshaft provided with pedals.
- a force is applied that tends to tilt the shaft S downward in the vertical direction, so the second bearing 602 tends to move in the radial direction, causing a part of the holder 504 to move outward in the radial direction. being pushed towards.
- stress tends to concentrate on the second elastic portion 622 of the strain body 621, so that the second elastic portion 622 undergoes elastic strain deformation.
- the four strain bodies 621 are located at four-fold symmetrical positions around the axis X, so that stress in all directions can be detected more accurately. Depending on the detected stress, the output of the motor of the electrically assisted bicycle can be adjusted.
- the torque sensor 600 does not use a magnetostrictive sensor, but has a simple configuration including a holder 504, a second bearing 602, and a strain sensor 603, and has the detection required when using a magnetostrictive sensor. Since there is no need to arrange a coil or the like around the shaft S, it is possible to downsize the device. Further, since processing such as attaching a magnetic layer to the shaft S is not necessary, manufacturing is easy.
- the strain body 621 (outer peripheral member 620) faces the inner peripheral member 610 with a gap 640 in between. Thereby, in the torque sensor 600, the second elastic portion 622 of the strain body 621 is easily strained and deformed, and stress can be detected with high sensitivity.
- the wall thickness near the axially lower end of the inner circumferential member 610 is thinner due to the formation of the recessed portion 612, so that the contact portion 611 moves toward the axially lower side. Almost deformed elastically. As a result, even when a preload is applied to the second bearing 602 downward in the axial direction, the contact portion 611 is elastically deformed, so that the influence of the preload can be absorbed. Therefore, in the torque sensor 600, the preload on the second bearing 602 is suppressed from appearing as strain in the second elastic portion 622, and the strain sensor 603 can detect stress with high sensitivity.
- a portion of the sensor device 500 above the torque sensor 600 in the axial direction has substantially the same configuration as the sensor device 400 according to the fourth embodiment. However, in the sensor device 500, there is no fixed portion 143 of the holder 404 of the sensor device 400 according to the fourth embodiment, and the four plate portions 541 are arranged in the axial direction of the inner peripheral member 610 of the holder 504. It is erected directly on the upper end face toward the upper side in the axial direction.
- the four plate parts 541 are arranged at four-fold symmetrical positions around the axis X on the outside of the first bearing 501 in the radial direction. In the circumferential direction, the four plate portions 541 are arranged at positions corresponding to the four strain bodies 621. Each plate portion 541 is in contact with the outer peripheral side 501b of the first bearing 501 via the radially inner tip portion 545a of the transmission portion 545. In this way, the holder 504 holds the first bearing 501. Note that the first bearing 501 is arranged above the axially upper end surface of the inner circumferential member 610 in the axial direction.
- Each plate portion 541 holds a strain gauge 102. That is, the holder 504 of the sensor device 500 includes, clockwise in plan view, the first strain gauge 102a held by the first plate part 541a, the second strain gauge 102b held by the second plate part 541b, A total of four strain gauges 102 are held, including a third strain gauge 102c held by a third plate part 541c and a fourth strain gauge 102d held by a fourth plate part 541d.
- Two strain gauges 102 adjacent in the circumferential direction are arranged at symmetrical positions with respect to a plane containing the axis X.
- the angle between the direction from the axis X toward the first strain gauge 102a and the direction from the axis X toward the second strain gauge 102b is 90°. Since all four plate parts 541 have the same configuration, only one plate part 541 will be explained in detail hereafter, and detailed explanation of the other plate parts 541 will be omitted unless necessary.
- a recess 544 that is semicircular in side view and extends in the tangential direction is formed on the inner surface of the plate portion 541.
- the recessed portion 544 is formed near the lower end of the plate portion 541 in the axial direction.
- the portion where the recessed portion 544 is formed has a thinner wall thickness, and serves as a first elastic portion 542 capable of elastic strain deformation.
- Strain gauge 102 is attached to the radially outer surface of first elastic portion 542 . Strain deformation of the first elastic portion 542 can be detected as a change in the resistance value of the strain gauge 102.
- An opening 541h which is a circular hole penetrating in the radial direction, is formed in the central portion of the plate portion 541 in the tangential direction and above the recess 544 in the axial direction.
- a pin-shaped transmission portion 545 is inserted into the opening 541h.
- the transmission portion 545 is fixed to the opening 541h by adhesive or press fitting.
- the transmission section 545 has a pointed tip 545a.
- the transmission portion 545 is arranged such that the tip portion 545a protrudes inward from the plate portion 541 in the radial direction.
- the outer peripheral side 501b of the first bearing 501 is in point contact with the tip 545a of the transmission section 545. Therefore, the transmission portion 545 can transmit the displacement of the first bearing 501 to the plate portion 541 via the tip portion 545a.
- the maximum thickness portion 103a of the eccentric member 103 is located close to the third plate portion 541c, and the minimum thickness portion 103b of the eccentric member 103 is located close to the first plate portion 541a. Therefore, the third plate portion 541c is pressed radially outward by the first bearing 501. Note that the second plate portion 541b and the fourth plate portion 541d adjacent to the third plate portion 541c are also slightly pressed radially outward by the first bearing 501.
- the first elastic portion 542 of the third plate portion 541c has undergone the largest strain deformation, and the upper side of the third plate portion 541c in the axial direction is warped toward the outside in the radial direction.
- the situation is as follows.
- the first elastic portions 542 of the second plate portion 541b and the fourth plate portion 541d adjacent to the third plate portion 541c are in a slightly strained state.
- the first elastic portion 542 of the first plate portion 541a is in a state where it is least strained or not strained at all.
- the eccentric member 103 fixed to the shaft S also rotates, and the central axis Y of the first bearing 501 also rotates around the axis X accordingly.
- the central axis Y of the first bearing 501 rotates around the axis X in a clockwise direction in a plan view.
- the central axis Y of the first bearing 501 rotates 90° clockwise in plan view from the state shown in FIG. 8, the first elastic portion 542 of the fourth plate portion 541d undergoes the most strain deformation. Transition to state.
- the sensor device 500 according to the present embodiment similarly has the characteristics described above for the sensor device 400 according to the fourth embodiment. Further, in the sensor device 500 according to this embodiment, the torque sensor 600 and the holder 504 are integrally formed. Therefore, when both a sensor for detecting a rotation angle (cadence sensor, etc.) and a torque sensor are mounted, such as when applied to a power-assisted bicycle, the overall size can be reduced.
- the strain gauge 102 attached to the plate portion 541 and the strain sensor 603 attached to the torque sensor 600 are arranged at corresponding positions in the circumferential direction. Further, when the strain sensor 603 is a strain gauge, all the strain gauges 102 and the strain sensor 603 are oriented in the same direction (typically, the longitudinal direction is oriented in the same direction as the axial direction). As described above, the workability when attaching the strain gauge 102 and the strain sensor 603 is improved.
- the stress generated in the holder 504 due to the force that causes the shaft S to tilt is absorbed by the outer peripheral member 620 of the torque sensor 600 disposed on the lower side in the axial direction. Therefore, it is possible to suppress the stress from affecting the strain gauge 102 disposed on the upper side in the axial direction. Therefore, in the sensor device 500 according to the present embodiment, the rotation angle of the shaft S can be detected with higher accuracy.
- the sensor device of the present invention has been described above with reference to preferred embodiments, the sensor device of the present invention is not limited to the configuration of the above embodiments.
- each sensor device according to the above embodiments is described with the assumption that it will be used as a cadence sensor for an electrically assisted bicycle, but the sensor device of the present invention is one that is used as a cadence sensor for an electrically assisted bicycle. Not limited to.
- an eccentric member is arranged between the bearing and the shaft, but the sensor device of the present invention is not limited to this, and the sensor device of the present invention can connect the bearing and the shaft without using an eccentric member.
- They may be eccentric to each other.
- shafts or bearings that themselves have an eccentric shape may be used.
- the bearing and the shaft may be made eccentric to each other by filling a resin or the like between the shaft and the bearing and hardening the resin.
- the shape of the eccentric member is not particularly limited. For example, a protrusion may be provided on the outer peripheral surface of the shaft, and this may be used as an eccentric member.
- the number of strain gauges may be one, two, or three.
- the number may be five or more. Even when the number of strain gauges is one, it is possible to detect the speed of rotation. However, in order to detect the rotation angle, it is preferable that the number of strain gauges is two or more.
- the first strain gauge and the second strain gauge are arranged at symmetrical positions with respect to a plane including the central axis of the shaft, and
- the angle between the direction toward the second strain gauge and the direction from the central axis of the shaft toward the second strain gauge is 90°.
- the angle may be any angle.
- it is preferable that the angle is not 180°.
- the portion above the torque sensor 600 in the axial direction has substantially the same configuration as the sensor device 400 according to the fourth embodiment, but the torque A portion above the sensor 600 in the axial direction may have substantially the same configuration as the sensor device according to the other embodiments described above.
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Abstract
The present invention provides a sensor device having excellent environmental resistance. A sensor device (100, 200, 300, 400, 500) includes a shaft (S), a bearing (101, 501) that has an inner circumference side (101a, 501a) and an outer circumference side (101b, 501b), and a strain gauge (102) that is attached to the outer circumference side (101b, 501b) of the bearing (101, 501) directly or via another member. The shaft (S) is disposed radially inside the inner circumference side (101a, 501a) of the bearing (101, 501). The bearing (101, 501) and the shaft (S) are eccentric with respect to each other.
Description
本発明は、センサ装置に関する。
The present invention relates to a sensor device.
回転体の回転角度を検出するためのセンサ装置として、光学式のセンサ装置や、磁気式のセンサ装置が知られている。光学式のセンサ装置は、例えば特許文献1に開示されている。磁気式のセンサ装置は、例えば特許文献2に開示されている。
Optical sensor devices and magnetic sensor devices are known as sensor devices for detecting the rotation angle of a rotating body. An optical sensor device is disclosed in Patent Document 1, for example. A magnetic sensor device is disclosed in Patent Document 2, for example.
光学式のセンサ装置や磁気式のセンサ装置は、塵埃等による汚染や周囲の磁気など、環境による影響を受けやすいため、より耐環境性の高いセンサ装置が求められている。本発明は、耐環境性に優れるセンサ装置の提供を課題の一例とする。
Optical sensor devices and magnetic sensor devices are easily affected by the environment, such as contamination by dust and surrounding magnetism, so there is a need for sensor devices with higher environmental resistance. An example of the present invention is to provide a sensor device with excellent environmental resistance.
本発明のセンサ装置は、シャフトと、内周側および外周側を有する軸受と、前記軸受の前記外周側に直接または他の部材を介して取り付けられたひずみゲージと、を有し、径方向において、前記シャフトは、前記軸受の前記内周側の内側に配置され、前記軸受と前記シャフトとは、互いに偏心している。
The sensor device of the present invention includes a shaft, a bearing having an inner circumferential side and an outer circumferential side, and a strain gauge attached to the outer circumferential side of the bearing directly or via another member. , the shaft is disposed inside the inner peripheral side of the bearing, and the bearing and the shaft are eccentric with respect to each other.
本発明の各実施の形態の説明において、説明の便宜上、軸X(シャフトSの中心軸)に沿った矢印a方向を上側または軸方向一方側とする。軸Xに沿った矢印b方向を下側または軸方向他方側とする。ここで、矢印ab方向を上下方向または軸方向と称する。ただし、上下方向は、鉛直方向とは必ずしも一致しない。また、矢印cd方向を径方向と称し、軸Xから離れる矢印c方向を外側または径方向一方側、軸Xに近づく矢印d方向を内側または径方向他方側と称する。さらに、軸Xの周りの円の接線に沿った方向を接線方向と称する。
In the description of each embodiment of the present invention, for convenience of explanation, the direction of arrow a along the axis X (the central axis of the shaft S) is referred to as the upper side or one side in the axial direction. The direction of arrow b along axis X is defined as the lower side or the other axial side. Here, the direction of arrow ab is referred to as an up-down direction or an axial direction. However, the vertical direction does not necessarily match the vertical direction. Further, the direction of the arrow cd is referred to as the radial direction, the direction of the arrow c away from the axis X is referred to as the outer side or one side in the radial direction, and the direction of the arrow d approaching the axis X is referred to as the inner side or the other side in the radial direction. Furthermore, the direction along the tangent of the circle around the axis X is referred to as the tangential direction.
[第1の実施の形態]
以下、本発明の一例である第1の実施の形態について図面を参照しながら説明する。図1は、本実施の形態にかかるセンサ装置100の断面図である。図2は、センサ装置100の平面図である。 [First embodiment]
DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment, which is an example of the present invention, will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of asensor device 100 according to this embodiment. FIG. 2 is a plan view of the sensor device 100.
以下、本発明の一例である第1の実施の形態について図面を参照しながら説明する。図1は、本実施の形態にかかるセンサ装置100の断面図である。図2は、センサ装置100の平面図である。 [First embodiment]
DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment, which is an example of the present invention, will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a
センサ装置100は、シャフトSと、内周側101aおよび外周側101bを有する軸受101と、軸受101の外周側101bにホルダ104を介して取り付けられたひずみゲージ102と、を有する。本実施の形態において、軸受101は、内輪101i、外輪101oおよび転動体を有するボールベアリングである。なお、軸受101は、ボールベアリングに限られず、例えばスリーブベアリング等、その他種々の軸受であってもよい。
The sensor device 100 includes a shaft S, a bearing 101 having an inner circumferential side 101a and an outer circumferential side 101b, and a strain gauge 102 attached to the outer circumferential side 101b of the bearing 101 via a holder 104. In this embodiment, the bearing 101 is a ball bearing having an inner ring 101i, an outer ring 101o, and rolling elements. Note that the bearing 101 is not limited to a ball bearing, and may be various other bearings such as a sleeve bearing.
シャフトSは、軸方向に延びる円柱状の部材である。図1および図2に示すように、径方向において、シャフトSは、軸受101の内周側101aの内側(径方向他方側、矢印d方向)に配置されている。軸方向において、シャフトSの下側(軸方向他方側、矢印b方向)の端部は、外部装置10の貫通孔11から、外部装置10の外部に突出している。軸受101の内周側101aとシャフトSの間には、軸方向の寸法が軸受101と同一または略同一である偏心部材103が配置されている。偏心部材103は、軸受101とシャフトSとを互いに偏心させている。換言すれば、偏心部材103は、シャフトSに対して軸受101を偏心させている。
The shaft S is a cylindrical member extending in the axial direction. As shown in FIGS. 1 and 2, in the radial direction, the shaft S is disposed inside the inner peripheral side 101a of the bearing 101 (the other radial side, in the direction of arrow d). In the axial direction, the lower end (the other axial side, the direction of arrow b) of the shaft S projects from the through hole 11 of the external device 10 to the outside of the external device 10 . An eccentric member 103 whose axial dimension is the same or substantially the same as that of the bearing 101 is arranged between the inner peripheral side 101a of the bearing 101 and the shaft S. The eccentric member 103 makes the bearing 101 and the shaft S eccentric to each other. In other words, the eccentric member 103 makes the bearing 101 eccentric with respect to the shaft S.
偏心部材103は、軸方向に延びる円柱状の部材であり、シャフトSの外径(直径)と同一または略同一の内径からなる円柱状の貫通孔を有している。すなわち、偏心部材103は、環状部材となっている。偏心部材103において、外周面(径方向外側(径方向一方側、矢印c方向)の面)の中心軸と、内周面(径方向内側の面)の中心軸とは一致していない。したがって、偏心部材103は、径方向の厚さが最大となる最大厚部分103aと、径方向の厚さが最小となる最小厚部分103bとを有する。
The eccentric member 103 is a cylindrical member extending in the axial direction, and has a cylindrical through hole having an inner diameter that is the same or substantially the same as the outer diameter (diameter) of the shaft S. That is, the eccentric member 103 is an annular member. In the eccentric member 103, the central axis of the outer circumferential surface (the radially outer surface (radially one side, direction of arrow c)) and the center axis of the inner circumferential surface (radially inner surface) do not coincide. Therefore, the eccentric member 103 has a maximum thickness portion 103a having the maximum thickness in the radial direction and a minimum thickness portion 103b having the minimum thickness in the radial direction.
シャフトSは、偏心部材103の内周面(径方向内側の面)に接着または圧入されている。これにより、シャフトSは、偏心部材103と一体に固定されている。軸受101の内輪101iは、偏心部材103の外周面(径方向外側の面)に接着または圧入されている。これにより、軸受101の内輪101iは、偏心部材103に固定されている。以上の構成により、シャフトSの中心軸である軸Xが、偏心部材103および軸受101の中心軸Yからずれるため、軸受101とシャフトSとが互いに偏心した位置関係になる。
The shaft S is bonded or press-fitted to the inner circumferential surface (radially inner surface) of the eccentric member 103. Thereby, the shaft S is fixed integrally with the eccentric member 103. The inner ring 101i of the bearing 101 is bonded or press-fitted to the outer peripheral surface (radially outer surface) of the eccentric member 103. Thereby, the inner ring 101i of the bearing 101 is fixed to the eccentric member 103. With the above configuration, the axis X, which is the central axis of the shaft S, is shifted from the central axis Y of the eccentric member 103 and the bearing 101, so that the bearing 101 and the shaft S have an eccentric positional relationship with respect to each other.
径方向において、軸受101の外側には、軸Xの周りに90°回転させると重なる回転対称(以下、「4回対称」という)となる位置に、4つの側面視略L字状のホルダ104が配置されている。それぞれのホルダ104は、軸受101の外周側101bに接触している。このようにして、それぞれのホルダ104は、軸受101を保持している。なお、軸方向において、軸受101は、後述する固定部143よりも上側(軸方向一方側、矢印a方向)に配置されている。
In the radial direction, on the outside of the bearing 101, there are four holders 104 that are approximately L-shaped in side view and are arranged at positions that overlap when rotated by 90 degrees around the axis X and have rotational symmetry (hereinafter referred to as "4-fold symmetry"). is located. Each holder 104 is in contact with the outer peripheral side 101b of the bearing 101. In this way, each holder 104 holds a bearing 101. In addition, in the axial direction, the bearing 101 is arranged above (on one side in the axial direction, in the direction of arrow a) than a fixing part 143, which will be described later.
それぞれのホルダ104は、ひずみゲージ102を保持している。すなわち、センサ装置100は、平面視時計回りに第1のホルダ104aに保持された第1のひずみゲージ102a、第2のホルダ104bに保持された第2のひずみゲージ102b、第3のホルダ104cに保持された第3のひずみゲージ102c(図2においては隠れている)、第4のホルダ104dに保持された第4のひずみゲージ102dの合計4つのひずみゲージ102を有している。
Each holder 104 holds a strain gauge 102. That is, the sensor device 100 has a first strain gauge 102a held in a first holder 104a, a second strain gauge 102b held in a second holder 104b, and a third holder 104c in a clockwise direction when viewed from above. It has a total of four strain gauges 102, including a third strain gauge 102c held (hidden in FIG. 2) and a fourth strain gauge 102d held in a fourth holder 104d.
周方向において隣り合う2つのひずみゲージ102、例えば、第1のひずみゲージ102aと第2のひずみゲージ102bとは、軸Xを含むある平面に関して対称となる位置に配置されている。センサ装置100において、軸Xから第1のひずみゲージ102aへ向かう方向と、軸Xから第2のひずみゲージ102bへ向かう方向とがなす角度は、90°となっている。4つのホルダ104は全て同一の構成を有するため、以降、1つのホルダ104のみを詳細に説明し、他のホルダ104については必要な場合を除いて詳細な説明を省略する。
Two strain gauges 102 adjacent in the circumferential direction, for example, the first strain gauge 102a and the second strain gauge 102b, are arranged at symmetrical positions with respect to a certain plane containing the axis X. In the sensor device 100, the angle between the direction from the axis X toward the first strain gauge 102a and the direction from the axis X toward the second strain gauge 102b is 90 degrees. Since all four holders 104 have the same configuration, only one holder 104 will be described in detail hereafter, and detailed description of the other holders 104 will be omitted unless necessary.
図1に示すように、ホルダ104は、軸方向に延びる長方形状の板部141と、板部141の軸方向下側の端部から径方向外側に延在する、平面視長方形状である板状の固定部143とを有する。径方向において、板部141の内側の面には、接線方向に延びる側面視半円形の凹部144が形成されている。凹部144は、板部141において軸方向中央部から僅かに下側寄りに形成されている。
As shown in FIG. 1, the holder 104 includes a rectangular plate portion 141 extending in the axial direction, and a rectangular plate portion 141 extending radially outward from the lower end of the plate portion 141 in the axial direction. It has a fixed part 143 having a shape. In the radial direction, a recess 144 that is semicircular in side view and extends in the tangential direction is formed on the inner surface of the plate portion 141 . The recessed portion 144 is formed in the plate portion 141 slightly downward from the center in the axial direction.
板部141においては、凹部144が形成された部分の肉厚が薄くなっており、弾性的なひずみ変形が可能な弾性部分142となっている。ひずみゲージ102は、弾性部分142の径方向外側の面に取り付けられている。弾性部分142のひずみ変形は、ひずみゲージ102の抵抗値の変化として検出可能となっている。軸方向において、軸受101の外周側101bは、凹部144よりも上側の部分で、板部141の軸方向内側の面と接触している。
In the plate portion 141, the wall thickness of the portion where the recessed portion 144 is formed is thinner, and becomes an elastic portion 142 that can undergo elastic strain deformation. Strain gauge 102 is attached to the radially outer surface of elastic portion 142 . Strain deformation of the elastic portion 142 can be detected as a change in the resistance value of the strain gauge 102. In the axial direction, the outer peripheral side 101b of the bearing 101 is in contact with the axially inner surface of the plate portion 141 at a portion above the recess 144.
ひずみゲージ102は、弾性部分142の、接線方向に対して垂直な平面に沿った方向のひずみを検出できるように取り付けられている。すなわち、ひずみゲージ102は、グリッドの向き(典型的には、ひずみゲージの長手方向)が軸方向となるように、弾性部分142に取り付けられている。
The strain gauge 102 is installed so as to be able to detect strain in the elastic portion 142 in a direction along a plane perpendicular to the tangential direction. That is, the strain gauge 102 is attached to the elastic portion 142 such that the grid orientation (typically, the longitudinal direction of the strain gauge) is in the axial direction.
ホルダ104の固定部143の中央部付近には、円形の貫通孔143hが形成されている。貫通孔143hに挿通されたボルト105により、ホルダ104は、スペーサ106を介して外部装置10に固定されている。
A circular through hole 143h is formed near the center of the fixing part 143 of the holder 104. The holder 104 is fixed to the external device 10 via a spacer 106 by a bolt 105 inserted into the through hole 143h.
図1および図2において、偏心部材103の最大厚部分103aは、第3のホルダ104cと近い位置にあり、偏心部材103の最小厚部分103bは、第1のホルダ104aと近い位置にある。そのため、第3のホルダ104cの板部141は、軸受101によって径方向外側へ向かって押圧されている。なお、第3のホルダ104cに隣り合う第2のホルダ104bおよび第4のホルダ104dのそれぞれの板部141も、軸受101によって径方向外側へ僅かに押圧されている。
In FIGS. 1 and 2, the maximum thickness portion 103a of the eccentric member 103 is located close to the third holder 104c, and the minimum thickness portion 103b of the eccentric member 103 is located close to the first holder 104a. Therefore, the plate portion 141 of the third holder 104c is pressed radially outward by the bearing 101. Note that the respective plate portions 141 of the second holder 104b and the fourth holder 104d adjacent to the third holder 104c are also slightly pressed radially outward by the bearing 101.
したがって、図1および図2においては、第3のホルダ104cの弾性部分142が最も大きくひずみ変形をしており、板部141の軸方向上側が、径方向外側に向かって反りかえった状態となっている。第3のホルダ104cに隣り合う第2のホルダ104bおよび第4のホルダ104dの弾性部分142は、僅かにひずみ変形した状態にある。第1のホルダ104aの弾性部分142は、最もひずみ変形をしていない状態、または全くひずみ変形をしていない状態にある。
Therefore, in FIGS. 1 and 2, the elastic portion 142 of the third holder 104c has undergone the largest strain deformation, and the upper side of the plate portion 141 in the axial direction is warped toward the outside in the radial direction. ing. The elastic portions 142 of the second holder 104b and the fourth holder 104d adjacent to the third holder 104c are in a slightly strained state. The elastic portion 142 of the first holder 104a is in a state where it is least strained or not strained at all.
シャフトSが回転すると、シャフトSに固定された偏心部材103も共に回転し、それに伴い、軸受101の中心軸Yも軸Xの周りを回転する。例えば、シャフトSが平面視時計回りに回転すると、軸受101の中心軸Yは軸Xの周りに平面視時計回りに回転する。図1および図2の状態から、軸受101の中心軸Yが軸Xの周りに平面視時計回りに90°回転すると、第4のホルダ104dの弾性部分142が最もひずみ変形をした状態へ遷移する。
When the shaft S rotates, the eccentric member 103 fixed to the shaft S also rotates, and the central axis Y of the bearing 101 also rotates around the axis X accordingly. For example, when the shaft S rotates clockwise in a plan view, the central axis Y of the bearing 101 rotates around the axis X in a clockwise direction in a plan view. When the central axis Y of the bearing 101 rotates 90° clockwise in a plan view from the state shown in FIGS. 1 and 2 around the axis X, the elastic portion 142 of the fourth holder 104d transitions to a state in which it is most strained. .
このように、本実施の形態にかかるセンサ装置100においては、軸受101の中心軸Yが軸Xの周りに平面視時計回りに90°回転する度に、順に、第3のホルダ104c、第4のホルダ104d、第1のホルダ104a、第2のホルダ104bの弾性部分142が最もひずみ変形をした状態へ遷移する。したがって、それぞれのホルダ104に取り付けられたひずみゲージ102により、シャフトSの回転角度を検出することができる。
In this way, in the sensor device 100 according to the present embodiment, each time the central axis Y of the bearing 101 rotates 90 degrees clockwise in plan view around the axis X, the third holder 104c, the fourth holder The elastic portions 142 of the holder 104d, the first holder 104a, and the second holder 104b transition to the most strained state. Therefore, the rotation angle of the shaft S can be detected by the strain gauges 102 attached to each holder 104.
本実施の形態にかかるセンサ装置100においては、軸受101とシャフトSとが互いに偏心した状態で取り付けられている。これによりセンサ装置100では、軸受101の内輪101iがシャフトSに対して偏心回転し、軸受101の外周側101bにホルダ104を介して取り付けられたひずみゲージ102によって、回転角度を検出できるようになっている。本実施の形態にかかるセンサ装置100は、光学式や磁気式のセンサを用いないため、塵埃等による汚染の影響や、周囲の磁気による影響をほとんど受けない。したがって、本実施の形態にかかるセンサ装置100は、環境耐性に優れる。
In the sensor device 100 according to the present embodiment, the bearing 101 and the shaft S are attached eccentrically to each other. As a result, in the sensor device 100, the inner ring 101i of the bearing 101 rotates eccentrically with respect to the shaft S, and the rotation angle can be detected by the strain gauge 102 attached to the outer peripheral side 101b of the bearing 101 via the holder 104. ing. Since the sensor device 100 according to the present embodiment does not use an optical or magnetic sensor, it is hardly affected by contamination by dust or the like or by surrounding magnetism. Therefore, the sensor device 100 according to this embodiment has excellent environmental resistance.
本実施の形態にかかるセンサ装置100は、偏心部材103が環状部材となっているため、楔等を用いる場合と比較して強度に優れ、長寿命である。また、本実施の形態にかかるセンサ装置100は、第1のひずみゲージ102aと第2のひずみゲージ102bとを含む複数のひずみゲージ102を有し、第1のひずみゲージ102aと第2のひずみゲージ102bとは、シャフトSの中心軸(軸X)を含む平面に関して対称となる位置に配置されており、軸Xから第1のひずみゲージ102aへ向かう方向と、軸Xから第2のひずみゲージ102bへ向かう方向とがなす角度は、90°となっている。したがって、本実施の形態にかかるセンサ装置100は、シャフトSの回転角度をより精度よく検出することができる。
Since the eccentric member 103 of the sensor device 100 according to the present embodiment is an annular member, it has excellent strength and has a long life compared to a case where a wedge or the like is used. Further, the sensor device 100 according to the present embodiment has a plurality of strain gauges 102 including a first strain gauge 102a and a second strain gauge 102b, and the first strain gauge 102a and the second strain gauge 102b is arranged at a symmetrical position with respect to a plane containing the central axis (axis The angle formed by the direction toward is 90°. Therefore, the sensor device 100 according to this embodiment can detect the rotation angle of the shaft S with higher accuracy.
[第2の実施の形態]
続いて、本発明の一例である第2の実施の形態について図面を参照しながら説明する。図3は、本実施の形態にかかるセンサ装置200の断面図である。図4は、センサ装置200の平面図である。センサ装置200は、ホルダ104の代わりにホルダ204を有する点を除き、第1の実施の形態にかかるセンサ装置100と同様の構成を有する。以下、第1の実施の形態と同一の機能および構成を有する部材および部品については、第1の実施の形態と同一の符号を付して、その詳細な説明を省略する。 [Second embodiment]
Next, a second embodiment, which is an example of the present invention, will be described with reference to the drawings. FIG. 3 is a cross-sectional view ofsensor device 200 according to this embodiment. FIG. 4 is a plan view of the sensor device 200. The sensor device 200 has the same configuration as the sensor device 100 according to the first embodiment, except that it includes a holder 204 instead of the holder 104. Hereinafter, members and components having the same functions and configurations as those in the first embodiment will be designated by the same reference numerals as in the first embodiment, and detailed description thereof will be omitted.
続いて、本発明の一例である第2の実施の形態について図面を参照しながら説明する。図3は、本実施の形態にかかるセンサ装置200の断面図である。図4は、センサ装置200の平面図である。センサ装置200は、ホルダ104の代わりにホルダ204を有する点を除き、第1の実施の形態にかかるセンサ装置100と同様の構成を有する。以下、第1の実施の形態と同一の機能および構成を有する部材および部品については、第1の実施の形態と同一の符号を付して、その詳細な説明を省略する。 [Second embodiment]
Next, a second embodiment, which is an example of the present invention, will be described with reference to the drawings. FIG. 3 is a cross-sectional view of
センサ装置200は、シャフトSと、内周側101aおよび外周側101bを有する軸受101と、軸受101の外周側101bにホルダ204を介して取り付けられたひずみゲージ102と、を有する。
The sensor device 200 includes a shaft S, a bearing 101 having an inner circumferential side 101a and an outer circumferential side 101b, and a strain gauge 102 attached to the outer circumferential side 101b of the bearing 101 via a holder 204.
径方向において、軸受101の外側には、断面視L字状の円環状のホルダ204が配置されている。ホルダ204は、軸受101の外周側101bに接触している。このようにして、ホルダ204は、軸受101を保持している。なお、軸受101は、軸方向において、後述する固定部243よりも上側に配置されている。
In the radial direction, an annular holder 204 having an L-shape in cross section is arranged outside the bearing 101. The holder 204 is in contact with the outer peripheral side 101b of the bearing 101. In this way, the holder 204 holds the bearing 101. Note that the bearing 101 is arranged above a fixed portion 243, which will be described later, in the axial direction.
ホルダ204は、ひずみ変形していない状態において軸Xの周りに4回対称となる位置に、4つのひずみゲージ102を保持している。すなわち、センサ装置200は、平面視時計回りに第1のひずみゲージ102a、第2のひずみゲージ102b、第3のひずみゲージ102c(図4においては隠れている)、第4のひずみゲージ102dの合計4つのひずみゲージ102を有している。
The holder 204 holds the four strain gauges 102 at four-fold symmetrical positions around the axis X in an unstrained state. That is, the sensor device 200 includes, in clockwise plan view, a first strain gauge 102a, a second strain gauge 102b, a third strain gauge 102c (hidden in FIG. 4), and a fourth strain gauge 102d. It has four strain gauges 102.
周方向において隣り合う2つのひずみゲージ102、例えば、第1のひずみゲージ102aと第2のひずみゲージ102bとは、軸Xを含む平面に関して対称となる位置に配置されている。センサ装置200において、軸Xから第1のひずみゲージ102aへ向かう方向と、軸Xから第2のひずみゲージ102bへ向かう方向とがなす角度は、90°となっている。
Two strain gauges 102 adjacent in the circumferential direction, for example, the first strain gauge 102a and the second strain gauge 102b, are arranged at symmetrical positions with respect to a plane containing the axis X. In the sensor device 200, the angle between the direction from the axis X toward the first strain gauge 102a and the direction from the axis X toward the second strain gauge 102b is 90 degrees.
図3に示すように、ホルダ204は、軸方向に延びる円筒部241と、円筒部241の軸方向下側の端部から径方向外側に延在する、平面視長方形状である4つの板状の固定部243とを有する。4つの固定部243は、軸Xの周りに4回対称となる位置に配置されている。径方向において、円筒部241の内周面(径方向内側の面)241aには、環状に断面視半円形の凹部244が形成されている。凹部244は、円筒部241において軸方向中央部から僅かに下側寄りに形成されている。
As shown in FIG. 3, the holder 204 includes a cylindrical portion 241 that extends in the axial direction, and four plate-shaped plates that are rectangular in plan view and extend radially outward from the lower end of the cylindrical portion 241 in the axial direction. It has a fixed part 243. The four fixing parts 243 are arranged at four-fold symmetrical positions around the axis X. In the radial direction, an annular recess 244 having a semicircular cross section is formed on the inner circumferential surface (radially inner surface) 241a of the cylindrical portion 241. The recess 244 is formed in the cylindrical portion 241 slightly downward from the axial center.
円筒部241においては、凹部244が形成された部分は肉厚が薄くなっており、弾性的なひずみ変形が可能な弾性部分242となっている。ひずみゲージ102は、弾性部分242の径方向外側の面に取り付けられている。弾性部分242のひずみ変形は、ひずみゲージ102の抵抗値の変化として検出可能となっている。軸方向において、軸受101の外周側101bは、ひずみゲージ102の取り付けられた位置よりも上側の部分で、円筒部241の内周面241aと接触している。
In the cylindrical portion 241, the portion where the recess 244 is formed has a thinner wall thickness, and is an elastic portion 242 that can undergo elastic strain deformation. Strain gauge 102 is attached to the radially outer surface of elastic portion 242 . Strain deformation of the elastic portion 242 can be detected as a change in the resistance value of the strain gauge 102. In the axial direction, the outer circumferential side 101b of the bearing 101 is in contact with the inner circumferential surface 241a of the cylindrical portion 241 at a portion above the position where the strain gauge 102 is attached.
ひずみゲージ102は、弾性部分242の、接線方向に対して垂直な平面に沿った方向のひずみを検出できるように取り付けられている。すなわち、ひずみゲージ102は、グリッドの向き(典型的には、ひずみゲージの長手方向)が軸方向となるように、弾性部分242に取り付けられている。
The strain gauge 102 is installed so that it can detect strain in the elastic portion 242 in a direction along a plane perpendicular to the tangential direction. That is, the strain gauge 102 is attached to the elastic portion 242 such that the grid orientation (typically, the longitudinal direction of the strain gauge) is in the axial direction.
ホルダ204の固定部243の中央部付近には、円形の貫通孔243hが形成されている。貫通孔243hに挿通されたボルト105により、ホルダ204は、スペーサ106を介して外部装置10に固定されている。
A circular through hole 243h is formed near the center of the fixing part 243 of the holder 204. The holder 204 is fixed to the external device 10 via the spacer 106 by a bolt 105 inserted into the through hole 243h.
図3および図4において、偏心部材103の最大厚部分103aは、第3のひずみゲージ102cと近い位置にあり、偏心部材103の最小厚部分103bは、第1のひずみゲージ102aと近い位置にある。そのため、ホルダ204の円筒部241は、第3のひずみゲージ102cが取り付けられた側において、軸受101によって径方向外側へ向かって押圧されている。なお、ホルダ204の円筒部241の、第2のひずみゲージ102bおよび第4のひずみゲージ102dが取り付けられた側も、軸受101によって径方向外側へ僅かに押圧されている。
3 and 4, the maximum thickness portion 103a of the eccentric member 103 is located close to the third strain gauge 102c, and the minimum thickness portion 103b of the eccentric member 103 is located close to the first strain gauge 102a. . Therefore, the cylindrical portion 241 of the holder 204 is pressed radially outward by the bearing 101 on the side where the third strain gauge 102c is attached. Note that the side of the cylindrical portion 241 of the holder 204 to which the second strain gauge 102b and the fourth strain gauge 102d are attached is also slightly pressed radially outward by the bearing 101.
したがって、図3および図4においては、ホルダ204の弾性部分242の、第3のひずみゲージ102cが取り付けられた側が最も大きくひずみ変形をしており、円筒部241の軸方向上側が、径方向外側に向かって反りかえった状態となっている。ホルダ204の弾性部分242の、第2のひずみゲージ102bおよび第4のひずみゲージ102dが取り付けられた側は、僅かにひずみ変形した状態にある。ホルダ204の弾性部分242の、第1のひずみゲージ102aが取り付けられた側は、最もひずみ変形をしていない状態にある。
Therefore, in FIGS. 3 and 4, the side of the elastic portion 242 of the holder 204 to which the third strain gauge 102c is attached is subjected to the largest strain deformation, and the axially upper side of the cylindrical portion 241 is radially outward. It is in a state where it is curved towards. The side of the elastic portion 242 of the holder 204 to which the second strain gauge 102b and the fourth strain gauge 102d are attached is in a slightly deformed state. The side of the elastic portion 242 of the holder 204 to which the first strain gauge 102a is attached is in a state where it is least strain-deformed.
シャフトSが回転すると、シャフトSに固定された偏心部材103も共に回転し、それに伴い、軸受101の中心軸Yも軸Xの周りを回転する。例えば、シャフトSが平面視時計回りに回転すると、軸受101の中心軸Yは軸Xの周りに平面視時計回りに回転する。図3の状態から、軸受101の中心軸Yが軸Xの周りに平面視時計回りに90°回転すると、ホルダ204の弾性部分242の、第4のひずみゲージ102dが取り付けられた側が最もひずみ変形をした状態へ遷移する。
When the shaft S rotates, the eccentric member 103 fixed to the shaft S also rotates, and the central axis Y of the bearing 101 also rotates around the axis X accordingly. For example, when the shaft S rotates clockwise in a plan view, the central axis Y of the bearing 101 rotates around the axis X in a clockwise direction in a plan view. When the central axis Y of the bearing 101 rotates 90° clockwise in plan view from the state shown in FIG. Transition to the state where
このように、本実施の形態にかかるセンサ装置200においては、軸受101の中心軸Yが軸Xの周りに平面視時計回りに90°回転する度に、ホルダ204の弾性部分242の、順に、第3のひずみゲージ102cが取り付けられた側、第4のひずみゲージ102dが取り付けられた側、第1のひずみゲージ102aが取り付けられた側、第2のひずみゲージ102bが取り付けられた側が、最もひずみ変形をした状態へ遷移する。したがって、ホルダ204に取り付けられた4つのひずみゲージ102により、シャフトSの回転角度を検出することができる。
In this way, in the sensor device 200 according to the present embodiment, each time the central axis Y of the bearing 101 rotates 90° clockwise in plan view around the axis X, the elastic portion 242 of the holder 204 sequentially The side to which the third strain gauge 102c is attached, the side to which the fourth strain gauge 102d is attached, the side to which the first strain gauge 102a is attached, and the side to which the second strain gauge 102b is attached have the highest strain. Transition to a transformed state. Therefore, the rotation angle of the shaft S can be detected by the four strain gauges 102 attached to the holder 204.
本実施の形態にかかるセンサ装置200は、第1の実施の形態にかかるセンサ装置100について上記した特性を同様に有する。加えて、本実施の形態にかかるセンサ装置200は、ホルダ204が1つの部材から構成されているため、より強度に優れ、ひずみゲージ102の位置決めが容易であり、また、外部装置への取り付けが容易である。
The sensor device 200 according to the present embodiment similarly has the characteristics described above for the sensor device 100 according to the first embodiment. In addition, in the sensor device 200 according to the present embodiment, the holder 204 is composed of one member, so it is superior in strength, the strain gauge 102 can be easily positioned, and the sensor device 200 can be easily attached to an external device. It's easy.
[第3の実施の形態]
続いて、本発明の一例である第3の実施の形態について図面を参照しながら説明する。図5は、本実施の形態にかかるセンサ装置300の断面図である。センサ装置300は、偏心部材103の代わりに偏心部材303を備える点を除き、第1の実施の形態にかかるセンサ装置100と同様の構成を有する。以下、第1の実施の形態と同一の機能および構成を有する部材および部品については、第1の実施の形態と同一の符号を付して、その詳細な説明を省略する。 [Third embodiment]
Next, a third embodiment, which is an example of the present invention, will be described with reference to the drawings. FIG. 5 is a cross-sectional view ofsensor device 300 according to this embodiment. The sensor device 300 has the same configuration as the sensor device 100 according to the first embodiment, except that an eccentric member 303 is provided instead of the eccentric member 103. Hereinafter, members and components having the same functions and configurations as those in the first embodiment will be designated by the same reference numerals as in the first embodiment, and detailed description thereof will be omitted.
続いて、本発明の一例である第3の実施の形態について図面を参照しながら説明する。図5は、本実施の形態にかかるセンサ装置300の断面図である。センサ装置300は、偏心部材103の代わりに偏心部材303を備える点を除き、第1の実施の形態にかかるセンサ装置100と同様の構成を有する。以下、第1の実施の形態と同一の機能および構成を有する部材および部品については、第1の実施の形態と同一の符号を付して、その詳細な説明を省略する。 [Third embodiment]
Next, a third embodiment, which is an example of the present invention, will be described with reference to the drawings. FIG. 5 is a cross-sectional view of
軸受101の内周側101aとシャフトSの間には、偏心部材303が配置されている。偏心部材303は、軸受101とシャフトSとを互いに偏心させている。換言すれば、偏心部材303は、シャフトSに対して軸受101を偏心させている。本実施の形態において、偏心部材303は断面視略直角三角形状の楔である。軸方向において、偏心部材303は、下側に向かうにつれて径方向の寸法が小さくなる形状となっており、軸方向において、偏心部材303は、軸受101の上側から下側へ向かって挿入されている。ただし、反対に、軸方向において、偏心部材303は、上側に向かうにつれて径方向の寸法が小さくなる形状となっており、軸方向において、偏心部材303は、軸受101の下側から上側へ向かって挿入されていてもよい。
An eccentric member 303 is arranged between the inner peripheral side 101a of the bearing 101 and the shaft S. The eccentric member 303 makes the bearing 101 and the shaft S eccentric to each other. In other words, the eccentric member 303 makes the bearing 101 eccentric with respect to the shaft S. In this embodiment, the eccentric member 303 is a wedge having a substantially right triangular shape in cross section. In the axial direction, the eccentric member 303 has a shape in which the radial dimension becomes smaller toward the lower side, and in the axial direction, the eccentric member 303 is inserted from the upper side of the bearing 101 toward the lower side. . However, on the contrary, in the axial direction, the eccentric member 303 has a shape in which the radial dimension becomes smaller as it goes upward; It may be inserted.
偏心部材303の径方向内側の面は、シャフトSの外周面(径方向外側の面)に接着または圧入されている。これにより、偏心部材303は、シャフトSに一体に固定されている。軸受101の内輪101iは、偏心部材303の径方向外側の面に接着または圧入されている。これにより、軸受101の内輪101iは、偏心部材303に固定されている。以上の構成により、シャフトSの中心軸である軸Xが、軸受101の中心軸Yからずれるため、軸受101とシャフトSとが互いに偏心した位置関係になる。
The radially inner surface of the eccentric member 303 is bonded or press-fitted to the outer circumferential surface (radially outer surface) of the shaft S. Thereby, the eccentric member 303 is integrally fixed to the shaft S. The inner ring 101i of the bearing 101 is bonded or press-fitted to the radially outer surface of the eccentric member 303. Thereby, the inner ring 101i of the bearing 101 is fixed to the eccentric member 303. With the above configuration, the axis X, which is the central axis of the shaft S, is shifted from the central axis Y of the bearing 101, so that the bearing 101 and the shaft S have an eccentric positional relationship with respect to each other.
図5において、偏心部材303は、第3のホルダ104cと近い位置にある。そのため、第3のホルダ104cの板部141は、軸受101によって径方向外側へ向かって押圧されている。なお、第3のホルダ104cに隣り合う第2のホルダ104bおよび第4のホルダ104dのそれぞれの板部141も、軸受101によって径方向外側へ僅かに押圧されている。
In FIG. 5, the eccentric member 303 is located close to the third holder 104c. Therefore, the plate portion 141 of the third holder 104c is pressed radially outward by the bearing 101. Note that the respective plate portions 141 of the second holder 104b and the fourth holder 104d adjacent to the third holder 104c are also slightly pressed radially outward by the bearing 101.
したがって、図5においては、第3のホルダ104cの弾性部分142が最も大きくひずみ変形をしており、板部141の軸方向上側が、径方向外側に向かって反りかえった状態となっている。第3のホルダ104cに隣り合う第2のホルダ104bおよび第4のホルダ104dの弾性部分142は、僅かにひずみ変形した状態にある。第1のホルダ104aの弾性部分142は、最もひずみ変形をしていない状態、または全くひずみ変形をしていない状態にある。
Therefore, in FIG. 5, the elastic portion 142 of the third holder 104c has undergone the largest strain deformation, and the axially upper side of the plate portion 141 is warped radially outward. The elastic portions 142 of the second holder 104b and the fourth holder 104d adjacent to the third holder 104c are in a slightly strained state. The elastic portion 142 of the first holder 104a is in a state where it is least strained or not strained at all.
シャフトSが回転すると、シャフトSに固定された偏心部材303も共に回転し、それに伴い、軸受101の中心軸Yも軸Xの周りを回転する。例えば、シャフトSが平面視時計回りに回転すると、軸受101の中心軸Yは軸Xの周りに平面視時計回りに回転する。図5の状態から、軸受101の中心軸Yが軸Xの周りに平面視時計回りに90°回転すると、第4のホルダ104dの弾性部分142が最もひずみ変形をした状態へ遷移する。
When the shaft S rotates, the eccentric member 303 fixed to the shaft S also rotates, and the central axis Y of the bearing 101 also rotates around the axis X accordingly. For example, when the shaft S rotates clockwise in a plan view, the central axis Y of the bearing 101 rotates around the axis X in a clockwise direction in a plan view. When the central axis Y of the bearing 101 rotates 90 degrees clockwise in plan view from the state shown in FIG. 5, the elastic portion 142 of the fourth holder 104d transitions to a state in which it is most strained.
このように、本実施の形態にかかるセンサ装置300においては、軸受101の中心軸Yが軸Xの周りに平面視時計回りに90°回転する度に、順に、第3のホルダ104c、第4のホルダ104d、第1のホルダ104a、第2のホルダ104bの弾性部分142が最もひずみ変形をした状態へ遷移する。したがって、それぞれのホルダ104に取り付けられたひずみゲージ102により、シャフトSの回転角度を検出することができる。
In this way, in the sensor device 300 according to the present embodiment, each time the central axis Y of the bearing 101 rotates 90° clockwise in plan view around the axis X, the third holder 104c, the fourth holder The elastic portions 142 of the holder 104d, the first holder 104a, and the second holder 104b transition to the most strained state. Therefore, the rotation angle of the shaft S can be detected by the strain gauges 102 attached to each holder 104.
本実施の形態にかかるセンサ装置300は、第1の実施の形態にかかるセンサ装置100について上記した特性を同様に有する。加えて、本実施の形態にかかるセンサ装置300は、偏心部材303が楔であるため、軽量である。
The sensor device 300 according to the present embodiment similarly has the characteristics described above for the sensor device 100 according to the first embodiment. In addition, the sensor device 300 according to this embodiment is lightweight because the eccentric member 303 is a wedge.
[第4の実施の形態]
続いて、本発明の一例である第4の実施の形態について図面を参照しながら説明する。図6は、本実施の形態にかかるセンサ装置400の断面図である。センサ装置400は、ホルダ104の代わりにホルダ404を有する点を除き、第1の実施の形態にかかるセンサ装置100と同様の構成を有する。以下、第1の実施の形態と同一の機能および構成を有する部材および部品については、第1の実施の形態と同一の符号を付して、その詳細な説明を省略する。 [Fourth embodiment]
Next, a fourth embodiment, which is an example of the present invention, will be described with reference to the drawings. FIG. 6 is a cross-sectional view ofsensor device 400 according to this embodiment. The sensor device 400 has the same configuration as the sensor device 100 according to the first embodiment, except that it includes a holder 404 instead of the holder 104. Hereinafter, members and components having the same functions and configurations as those in the first embodiment will be designated by the same reference numerals as in the first embodiment, and detailed description thereof will be omitted.
続いて、本発明の一例である第4の実施の形態について図面を参照しながら説明する。図6は、本実施の形態にかかるセンサ装置400の断面図である。センサ装置400は、ホルダ104の代わりにホルダ404を有する点を除き、第1の実施の形態にかかるセンサ装置100と同様の構成を有する。以下、第1の実施の形態と同一の機能および構成を有する部材および部品については、第1の実施の形態と同一の符号を付して、その詳細な説明を省略する。 [Fourth embodiment]
Next, a fourth embodiment, which is an example of the present invention, will be described with reference to the drawings. FIG. 6 is a cross-sectional view of
センサ装置400は、シャフトSと、内周側101aおよび外周側101bを有する軸受101と、軸受101の外周側101bにホルダ404を介して取り付けられたひずみゲージ102と、を有する。
The sensor device 400 includes a shaft S, a bearing 101 having an inner circumferential side 101a and an outer circumferential side 101b, and a strain gauge 102 attached to the outer circumferential side 101b of the bearing 101 via a holder 404.
径方向において、軸受101の外側には、軸Xの周りに4回対称となる位置に、4つの側面視略L字状のホルダ404が配置されている。それぞれのホルダ404は、後述する伝達部445の径方向内側の先端部445aを介して軸受101の外周側101bに接触している。このようにして、それぞれのホルダ404は、軸受101を保持している。なお、軸受101は、軸方向において、後述する固定部143よりも上側に配置されている。
In the radial direction, on the outside of the bearing 101, four holders 404 that are approximately L-shaped in side view are arranged at four-fold symmetrical positions around the axis X. Each holder 404 is in contact with the outer peripheral side 101b of the bearing 101 via a radially inner tip portion 445a of a transmission portion 445, which will be described later. In this way, each holder 404 holds the bearing 101. Note that the bearing 101 is arranged above a fixed portion 143, which will be described later, in the axial direction.
それぞれのホルダ404は、ひずみゲージ102を保持している。すなわち、センサ装置400は、平面視時計回りに第1のホルダ404aに保持された第1のひずみゲージ102a、第2のホルダ404bに保持された第2のひずみゲージ102b、第3のホルダ404cに保持された第3のひずみゲージ102c、第4のホルダ404dに保持された第4のひずみゲージ102dの合計4つのひずみゲージ102を有している。
Each holder 404 holds a strain gauge 102. That is, the sensor device 400 has a first strain gauge 102a held by a first holder 404a, a second strain gauge 102b held by a second holder 404b, and a third holder 404c in a clockwise direction when viewed from above. It has a total of four strain gauges 102, including a third strain gauge 102c held and a fourth strain gauge 102d held by a fourth holder 404d.
周方向において隣り合う2つのひずみゲージ102、例えば、第1のひずみゲージ102aと第2のひずみゲージ102bとは、軸Xを含む平面に関して対称となる位置に配置されている。センサ装置400において、軸Xから第1のひずみゲージ102aへ向かう方向と、軸Xから第2のひずみゲージ102bへ向かう方向とがなす角度は、90°となっている。4つのホルダ404は全て同一の構成を有するため、以降、1つのホルダ404のみを詳細に説明し、他のホルダ404については必要な場合を除いて詳細な説明を省略する。
Two strain gauges 102 adjacent in the circumferential direction, for example, the first strain gauge 102a and the second strain gauge 102b, are arranged at symmetrical positions with respect to a plane containing the axis X. In the sensor device 400, the angle between the direction from the axis X toward the first strain gauge 102a and the direction from the axis X toward the second strain gauge 102b is 90°. Since all four holders 404 have the same configuration, only one holder 404 will be explained in detail hereafter, and detailed explanations of the other holders 404 will be omitted unless necessary.
図6に示すように、ホルダ404は、軸方向に延びる長方形状の板部441と、板部441の軸方向下側の端部から径方向外側に延在する、平面視長方形状である板状の固定部143とを有する。径方向において、板部441の内側の面には、接線方向に延びる側面視半円形の凹部144が形成されている。凹部144は、板部441において軸方向中央部から僅かに下側寄りに形成されている。
As shown in FIG. 6, the holder 404 includes a rectangular plate portion 441 extending in the axial direction, and a rectangular plate portion 441 extending radially outward from the lower end of the plate portion 441 in the axial direction. It has a fixed part 143 having a shape. In the radial direction, a recess 144 that is semicircular in side view and extends in the tangential direction is formed on the inner surface of the plate portion 441 . The recessed portion 144 is formed in the plate portion 441 slightly downward from the axial center.
板部441においては、凹部144が形成された部分は肉厚が薄くなっており、弾性的なひずみ変形が可能な弾性部分142となっている。ひずみゲージ102は、弾性部分142の径方向外側の面に取り付けられている。弾性部分142のひずみ変形は、ひずみゲージ102の抵抗値の変化として検出可能となっている。板部441の接線方向中央部、かつ凹部144よりも軸方向上側には、径方向に貫通する円形の孔である開口部441hが形成されている。開口部441hには、ピン状の伝達部445が挿入されている。伝達部445は、開口部441hに、接着または圧入により固定されている。
In the plate portion 441, the portion where the concave portion 144 is formed has a thinner wall thickness, and serves as an elastic portion 142 that can undergo elastic strain deformation. Strain gauge 102 is attached to the radially outer surface of elastic portion 142 . Strain deformation of the elastic portion 142 can be detected as a change in the resistance value of the strain gauge 102. An opening 441h, which is a circular hole penetrating in the radial direction, is formed in the central portion of the plate portion 441 in the tangential direction and above the recess 144 in the axial direction. A pin-shaped transmission section 445 is inserted into the opening 441h. The transmission portion 445 is fixed to the opening 441h by adhesive or press fitting.
伝達部445は、先の尖った先端部445aを有する。伝達部445は、径方向において、先端部445aが板部441よりも内側へ突出するように配置されている。軸受101の外周側101bは、伝達部445の先端部445aと点接触している。したがって、伝達部445は、先端部445aを介して、軸受101の変位をホルダ404へ伝達することができる。
The transmission section 445 has a pointed tip 445a. The transmission portion 445 is arranged such that the distal end portion 445a protrudes further inward than the plate portion 441 in the radial direction. The outer peripheral side 101b of the bearing 101 is in point contact with the tip end 445a of the transmission section 445. Therefore, the transmission portion 445 can transmit the displacement of the bearing 101 to the holder 404 via the tip portion 445a.
シャフトSが回転すると、シャフトSに固定された偏心部材103も共に回転し、それに伴い、軸受101の中心軸Yも軸Xの周りを回転する。例えば、シャフトSが平面視時計回りに回転すると、軸受101の中心軸Yは軸Xの周りに平面視時計回りに回転する。図6の状態から、軸受101の中心軸Yが軸Xの周りに平面視時計回りに90°回転すると、第4のホルダ404dの弾性部分142が最もひずみ変形をした状態へ遷移する。
When the shaft S rotates, the eccentric member 103 fixed to the shaft S also rotates, and the central axis Y of the bearing 101 also rotates around the axis X accordingly. For example, when the shaft S rotates clockwise in a plan view, the central axis Y of the bearing 101 rotates around the axis X in a clockwise direction in a plan view. When the central axis Y of the bearing 101 rotates 90° clockwise in a plan view from the state shown in FIG. 6, the elastic portion 142 of the fourth holder 404d transitions to a state in which it is most strained.
このように、本実施の形態にかかるセンサ装置400においては、軸受101の中心軸Yが軸Xの周りに平面視時計回りに90°回転する度に、順に、第3のホルダ404c、第4のホルダ404d、第1のホルダ404a、第2のホルダ404bの弾性部分142が最もひずみ変形をした状態へ遷移する。したがって、それぞれのホルダ404に取り付けられたひずみゲージ102により、シャフトSの回転角度を検出することができる。
In this way, in the sensor device 400 according to the present embodiment, each time the central axis Y of the bearing 101 rotates 90 degrees clockwise in plan view around the axis X, the third holder 404c, the fourth holder The elastic portions 142 of the holder 404d, the first holder 404a, and the second holder 404b transition to the most strained state. Therefore, the rotation angle of the shaft S can be detected by the strain gauges 102 attached to each holder 404.
本実施の形態にかかるセンサ装置400は、第1の実施の形態にかかるセンサ装置100について上記した特性を同様に有する。加えて、本実施の形態にかかるセンサ装置400は、伝達部445を有し、軸受101の外周側101bが、伝達部445の先端部445aに接触している。したがって、本実施の形態にかかるセンサ装置400によれば、軸受101の変位を点で捉えることが可能であり、シャフトSの回転角度の検出精度が向上する。
The sensor device 400 according to this embodiment similarly has the characteristics described above for the sensor device 100 according to the first embodiment. In addition, the sensor device 400 according to the present embodiment has a transmission section 445, and the outer peripheral side 101b of the bearing 101 is in contact with the tip 445a of the transmission section 445. Therefore, according to the sensor device 400 according to the present embodiment, it is possible to detect the displacement of the bearing 101 as a point, and the detection accuracy of the rotation angle of the shaft S is improved.
また、本実施の形態にかかるセンサ装置400においては、ホルダ404がひずみ変形する際に軸受101により押圧される点が、シャフトSの回転角度に依存せず常に一定となる。このことからも、本実施の形態にかかるセンサ装置400によれば、シャフトSの回転角度の検出精度が向上する。
Furthermore, in the sensor device 400 according to the present embodiment, the point pressed by the bearing 101 when the holder 404 is strain-deformed is always constant regardless of the rotation angle of the shaft S. Also from this, according to the sensor device 400 according to the present embodiment, the detection accuracy of the rotation angle of the shaft S is improved.
[第5の実施の形態]
続いて、本発明の一例である第5の実施の形態について図面を参照しながら説明する。図7は、本実施の形態にかかるセンサ装置500のホルダ504、ひずみゲージ102およびひずみセンサ603の斜視図である。図8は、本実施の形態にかかるセンサ装置500の断面図である。センサ装置500は、第4の実施の形態にかかるセンサ装置400の軸方向下側に、トルクセンサ600が一体化されて配置された構造となっている。以下、第1および第4の実施の形態と同一の機能および構成を有する部材および部品については、第1および第4の実施の形態と同一の符号を付して、その詳細な説明を省略する。 [Fifth embodiment]
Next, a fifth embodiment, which is an example of the present invention, will be described with reference to the drawings. FIG. 7 is a perspective view ofholder 504, strain gauge 102, and strain sensor 603 of sensor device 500 according to this embodiment. FIG. 8 is a cross-sectional view of sensor device 500 according to this embodiment. The sensor device 500 has a structure in which a torque sensor 600 is integrated and arranged below the sensor device 400 according to the fourth embodiment in the axial direction. Hereinafter, members and parts having the same functions and configurations as those in the first and fourth embodiments will be given the same reference numerals as in the first and fourth embodiments, and detailed explanations thereof will be omitted. .
続いて、本発明の一例である第5の実施の形態について図面を参照しながら説明する。図7は、本実施の形態にかかるセンサ装置500のホルダ504、ひずみゲージ102およびひずみセンサ603の斜視図である。図8は、本実施の形態にかかるセンサ装置500の断面図である。センサ装置500は、第4の実施の形態にかかるセンサ装置400の軸方向下側に、トルクセンサ600が一体化されて配置された構造となっている。以下、第1および第4の実施の形態と同一の機能および構成を有する部材および部品については、第1および第4の実施の形態と同一の符号を付して、その詳細な説明を省略する。 [Fifth embodiment]
Next, a fifth embodiment, which is an example of the present invention, will be described with reference to the drawings. FIG. 7 is a perspective view of
センサ装置500は、シャフトSと、内周側501aおよび外周側501bを有する第1の軸受501と、第1の軸受501の外周側501bにホルダ504を介して取り付けられたひずみゲージ102と、トルクセンサ600を有する。ホルダ504はトルクセンサ600のホルダと一体に形成されているため、トルクセンサ600のホルダも同じ符号を用いてホルダ504と称する。トルクセンサ600は、ホルダ504に加え、第2の軸受602と、ひずみセンサ603を有する。
The sensor device 500 includes a shaft S, a first bearing 501 having an inner circumferential side 501a and an outer circumferential side 501b, a strain gauge 102 attached to the outer circumferential side 501b of the first bearing 501 via a holder 504, and a torque It has a sensor 600. Since the holder 504 is integrally formed with the holder of the torque sensor 600, the holder of the torque sensor 600 will also be referred to as the holder 504 using the same reference numeral. In addition to the holder 504, the torque sensor 600 includes a second bearing 602 and a strain sensor 603.
本実施の形態において、第1の軸受501は、内輪501i、外輪501oおよび転動体を有するボールベアリングである。第2の軸受602は、内輪602i、外輪602oおよび転動体を有するボールベアリングである。なお、第1の軸受501および第2の軸受602は、ボールベアリングに限られず、例えばスリーブベアリング等、その他種々の軸受であってもよい。軸方向において、第1の軸受501は、第2の軸受602の上側に、間隔を開けて配置されている。第1の軸受501の構成は、第1の実施の形態にかかるセンサ装置100の軸受101の構成と同一である。
In this embodiment, the first bearing 501 is a ball bearing having an inner ring 501i, an outer ring 501o, and rolling elements. The second bearing 602 is a ball bearing having an inner ring 602i, an outer ring 602o, and rolling elements. Note that the first bearing 501 and the second bearing 602 are not limited to ball bearings, and may be various other bearings such as sleeve bearings. In the axial direction, the first bearing 501 is arranged above the second bearing 602 with a space therebetween. The configuration of the first bearing 501 is the same as the configuration of the bearing 101 of the sensor device 100 according to the first embodiment.
まず、トルクセンサ600について説明する。図7に示すように、ホルダ504は、平面視略正方形の筒形状であり、内周部材610および外周部材620を有する。内周部材610は、軸Xの周りに円筒状の内周面610aを有する、軸方向に延びる筒状の部材である。外周部材620は、径方向において、内周部材610よりも外側に配置された部材である。
First, the torque sensor 600 will be explained. As shown in FIG. 7, the holder 504 has a substantially square cylindrical shape in plan view, and includes an inner circumferential member 610 and an outer circumferential member 620. The inner circumferential member 610 is a cylindrical member having a cylindrical inner circumferential surface 610a around the axis X and extending in the axial direction. The outer circumferential member 620 is a member disposed outside the inner circumferential member 610 in the radial direction.
軸方向において、内周部材610の寸法は、外周部材620の寸法と同一である。内周部材610の軸方向上側の端面および軸方向下側の端面は、それぞれ外周部材620の軸方向上側の端面および軸方向下側の端面と同一平面上にある。内周部材610の径方向外側かつ軸方向上側の端部には、4つの平面視略長方形状の接続部630が、内周部材610から径方向外側へ放射状に突出している。4つの接続部630は、軸Xの周りに4回対称となる位置に配置されている。
In the axial direction, the dimensions of the inner peripheral member 610 are the same as the dimensions of the outer peripheral member 620. The axially upper end surface and the axially lower end surface of the inner peripheral member 610 are on the same plane as the axially upper end surface and the axially lower end surface of the outer peripheral member 620, respectively. At the radially outer and axially upper ends of the inner circumferential member 610, four connecting portions 630 having a generally rectangular shape in plan view protrude radially outward from the inner circumferential member 610. The four connecting parts 630 are arranged at four-fold symmetrical positions around the axis X.
それぞれの接続部630には、平面視長方形状かつ側面視略L字状の起歪体621が接続されている。起歪体621は、応力を受けることによって変形する変形部であり、応力を受けることによって弾性変形または塑性変形をする。4つの起歪体621が、本実施の形態における外周部材620となっている。したがって、接続部630は、内周部材610と外周部材620とを接続している。4つの起歪体621は全て同一の構成を有するため、以降、1つの起歪体621のみを詳細に説明し、他の起歪体621については詳細な説明を省略する。
A strain body 621 having a rectangular shape in plan view and a substantially L-shape in side view is connected to each connection portion 630. The strain body 621 is a deformable portion that deforms by receiving stress, and deforms elastically or plastically by receiving stress. The four strain bodies 621 constitute the outer peripheral member 620 in this embodiment. Therefore, the connecting portion 630 connects the inner peripheral member 610 and the outer peripheral member 620. Since all four strain bodies 621 have the same configuration, only one strain body 621 will be described in detail hereafter, and detailed explanations of the other strain bodies 621 will be omitted.
図8に示すように、径方向において、起歪体621(外周部材620)は、内周部材610と、接線方向に延在する間隙640を介して対向している。間隙640は、側面視円形または略円形の貫通孔641と、貫通孔641の軸方向下側の僅かに径方向内側寄りに接続し、貫通孔641の直径よりも幅(径方向の幅)の狭いスリット642とを含む。
As shown in FIG. 8, in the radial direction, the strain body 621 (outer peripheral member 620) faces the inner peripheral member 610 with a gap 640 extending in the tangential direction. The gap 640 connects to the through hole 641, which is circular or approximately circular in side view, on the axially lower side of the through hole 641 and slightly inward in the radial direction, and has a width (radial width) smaller than the diameter of the through hole 641. narrow slit 642.
貫通孔641が形成されていることにより、起歪体621(外周部材620)には、径方向内側の面において、径方向外側に窪む凹部が形成されており、接続部630には、軸方向下側の面において、軸方向上側に窪む凹部が形成されており、内周部材610には、径方向外側の面において、径方向内側に窪む凹部が形成されている。
By forming the through hole 641, a concave portion recessed radially outward is formed in the radially inner surface of the strain body 621 (outer peripheral member 620), and the connecting portion 630 has a recessed portion recessed toward the radially outer side. A recess that is recessed upward in the axial direction is formed in the lower surface, and a recess that is recessed inward in the radial direction is formed in the inner peripheral member 610 on the outer surface in the radial direction.
起歪体621(外周部材620)は、第2の弾性部分622を有する。すなわち、起歪体621(外周部材620)の一部は、弾性部分622として機能する。起歪体621の、径方向に垂直な平面に沿って延在する部分のうち、軸方向の中央部から僅かに上側の領域(凹部が形成されている領域)が、第2の弾性部分622となっている。径方向において、第2の弾性部分622と、内周部材610とは、間隙640を介して対向している。第2の弾性部分622は、内周部材610と対向する面に、径方向に窪む凹部を有する。凹部が形成されていることにより、第2の弾性部分622は、起歪体621(外周部材620)の他の部分と比較して、肉厚(径方向の厚み)が薄くなっており、弾性的なひずみ変形が起こりやすくなっている。
The strain body 621 (outer peripheral member 620) has a second elastic portion 622. That is, a portion of the strain body 621 (outer peripheral member 620) functions as the elastic portion 622. Of the portion of the strain body 621 extending along a plane perpendicular to the radial direction, a region slightly above the center in the axial direction (the region in which the recess is formed) is the second elastic portion 622. It becomes. In the radial direction, the second elastic portion 622 and the inner peripheral member 610 face each other with a gap 640 in between. The second elastic portion 622 has a radially recessed portion on a surface facing the inner peripheral member 610. Due to the formation of the concave portion, the second elastic portion 622 has a thinner wall thickness (thickness in the radial direction) than other portions of the strain body 621 (outer peripheral member 620), and has elasticity. Strain deformation is more likely to occur.
トルクセンサ600は、それぞれの起歪体621が第2の弾性部分622を有するので、全体としては複数(本実施の形態においては、4つ)の第2の弾性部分622を備えている。複数の第2の弾性部分622は、周方向において、ホルダ504の外側(内周部材610よりも径方向外側)に、4回対称となる位置に並んで配置されている(図7)。
Since each strain body 621 has a second elastic portion 622, the torque sensor 600 includes a plurality (four in this embodiment) of second elastic portions 622 as a whole. The plurality of second elastic portions 622 are arranged in four-fold symmetrical positions in line on the outside of the holder 504 (radially outside the inner peripheral member 610) in the circumferential direction (FIG. 7).
第2の弾性部分622の径方向外側の面には、ひずみセンサ603が取り付けられている。第2の弾性部分622およびひずみセンサ603は、それぞれ軸方向に平行な平面に沿って延在している。ひずみセンサ603は、第2の弾性部分622の、接線方向に対して垂直な平面に沿った方向のひずみを検出できるように取り付けられている。したがって、ひずみセンサ603がひずみゲージである場合、グリッドの向き(典型的には、ひずみゲージの長手方向)が軸方向となるように、第2の弾性部分622に取り付けられている。ひずみセンサ603がひずみゲージである場合、第2の弾性部分622のひずみは、抵抗値の変化として検出される。
A strain sensor 603 is attached to the radially outer surface of the second elastic portion 622. The second elastic portion 622 and the strain sensor 603 each extend along a plane parallel to the axial direction. The strain sensor 603 is installed so as to be able to detect strain in the second elastic portion 622 in a direction along a plane perpendicular to the tangential direction. Therefore, when the strain sensor 603 is a strain gauge, it is attached to the second elastic portion 622 such that the grid orientation (typically, the longitudinal direction of the strain gauge) is in the axial direction. When the strain sensor 603 is a strain gauge, the strain in the second elastic portion 622 is detected as a change in resistance value.
径方向において、起歪体621の第2の弾性部分622よりも外側には、外部装置10と接続される固定部623が配置されている。固定部623は、第2の弾性部分622の軸方向下側の端部から、径方向外側に向かって延在する四角形状の板状部分である。固定部623の中央部付近には、円形の貫通孔623hが形成されている。貫通孔623hに挿通されたボルト604により、起歪体621は、スペーサ605を介して外部装置10に固定されている。これにより、ホルダ504全体は、外部装置10に固定されている。
A fixing portion 623 connected to the external device 10 is arranged outside the second elastic portion 622 of the strain body 621 in the radial direction. The fixing portion 623 is a rectangular plate-shaped portion extending radially outward from the axially lower end of the second elastic portion 622 . A circular through hole 623h is formed near the center of the fixing portion 623. The strain body 621 is fixed to the external device 10 via a spacer 605 by a bolt 604 inserted into the through hole 623h. Thereby, the entire holder 504 is fixed to the external device 10.
径方向において、第2の軸受602は、ホルダ504の内周部材610の内側に配置されている。第2の軸受602は、ホルダ504の内周部材610に保持されている。第2の軸受602の内輪602iは、円柱状のシャフトSの外周面(径方向外側の面)に接着または圧入されている。これにより、第2の軸受602の内輪602iは、シャフトSに固定されている。第2の軸受602の外輪602oは、ホルダ504の内周部材610の内周面610aに圧入されている。第2の軸受602は、シャフトSをホルダ504に対して回転可能に支持している。シャフトSの軸方向下側の端部は、外部装置10の貫通孔11から、外部装置10の外部に突出している。
In the radial direction, the second bearing 602 is arranged inside the inner peripheral member 610 of the holder 504. The second bearing 602 is held by an inner peripheral member 610 of the holder 504. The inner ring 602i of the second bearing 602 is bonded or press-fitted to the outer circumferential surface (radially outer surface) of the cylindrical shaft S. Thereby, the inner ring 602i of the second bearing 602 is fixed to the shaft S. The outer ring 602o of the second bearing 602 is press-fitted into the inner peripheral surface 610a of the inner peripheral member 610 of the holder 504. The second bearing 602 rotatably supports the shaft S with respect to the holder 504. The lower end of the shaft S in the axial direction projects from the through hole 11 of the external device 10 to the outside of the external device 10 .
ホルダ504は、軸方向下側の端部において、径方向内側に突出する円環状の接触部611を有する。本実施の形態において、接触部611は、ホルダ504の内周部材610から径方向内側に突出している。接触部611は、第2の軸受602の外輪602oの軸方向下側の端面と接触している。これにより、接触部611は、第2の軸受602を軸方向において下方への移動を規制した状態で支持している。
The holder 504 has an annular contact portion 611 that protrudes radially inward at the lower end in the axial direction. In this embodiment, the contact portion 611 protrudes radially inward from the inner peripheral member 610 of the holder 504. The contact portion 611 is in contact with the axially lower end surface of the outer ring 602o of the second bearing 602. Thereby, the contact portion 611 supports the second bearing 602 in a state in which downward movement in the axial direction is restricted.
内周部材610の内周面610aの軸方向下側の端部近傍には、側面視半円形または略半円形の凹部612が形成されている。凹部612は、接触部611の軸方向上側において軸Xの周りに円環状に形成されている。凹部612の凹面の軸方向下側の端部は、接触部611の軸方向上側の端面に滑らかに接続している。
A recess 612 that is semicircular or approximately semicircular in side view is formed near the axially lower end of the inner circumferential surface 610a of the inner circumferential member 610. The recess 612 is formed in an annular shape around the axis X above the contact portion 611 in the axial direction. The axially lower end of the concave surface of the recessed portion 612 is smoothly connected to the axially upper end surface of the contact portion 611 .
センサ装置500が電動アシスト自転車に用いられる場合、シャフトSはペダルを備えるクランクシャフトである。一方のペダルが踏まれると、シャフトSの当該ペダル側が鉛直方向下向きに傾こうとする力が作用するため、第2の軸受602が径方向に移動しようとし、ホルダ504の一部が径方向外側に向かって押圧される。ホルダ504においては、起歪体621の第2の弾性部分622に応力が集中しやすくなっているため、第2の弾性部分622に弾性的なひずみ変形が生じる。
When the sensor device 500 is used for an electrically assisted bicycle, the shaft S is a crankshaft provided with pedals. When one pedal is stepped on, a force is applied that tends to tilt the shaft S downward in the vertical direction, so the second bearing 602 tends to move in the radial direction, causing a part of the holder 504 to move outward in the radial direction. being pushed towards. In the holder 504, stress tends to concentrate on the second elastic portion 622 of the strain body 621, so that the second elastic portion 622 undergoes elastic strain deformation.
ひずみセンサ603が取り付けられた第2の弾性部分622が複数存在すると、シャフトSのあらゆる方向の傾きに応じた応力を検出することができる。特に、トルクセンサ600においては、4つの起歪体621が、軸Xの周りに4回対称となる位置に存在しているため、全ての方向の応力をより正確に検出することができる。検出された応力に応じて、電動アシスト自転車のモータの出力を調節することができる。
If there are a plurality of second elastic parts 622 to which strain sensors 603 are attached, it is possible to detect stress according to the inclination of the shaft S in all directions. In particular, in the torque sensor 600, the four strain bodies 621 are located at four-fold symmetrical positions around the axis X, so that stress in all directions can be detected more accurately. Depending on the detected stress, the output of the motor of the electrically assisted bicycle can be adjusted.
トルクセンサ600は、磁歪式のセンサを用いるのではなく、ホルダ504、第2の軸受602およびひずみセンサ603を備える簡素な構成となっており、磁歪式のセンサを用いる場合に必要とされる検出コイル等をシャフトSの周りに配置する必要がないため、装置の小型化が可能となる。また、シャフトSに対する磁性層の貼り付け等の加工が不要であるため、製造が容易である。
The torque sensor 600 does not use a magnetostrictive sensor, but has a simple configuration including a holder 504, a second bearing 602, and a strain sensor 603, and has the detection required when using a magnetostrictive sensor. Since there is no need to arrange a coil or the like around the shaft S, it is possible to downsize the device. Further, since processing such as attaching a magnetic layer to the shaft S is not necessary, manufacturing is easy.
トルクセンサ600においては、径方向において、起歪体621(外周部材620)が、内周部材610と、間隙640を介して対向している。これにより、トルクセンサ600においては、起歪体621の第2の弾性部分622がひずみ変形しやすく、応力を感度よく検出することができる。
In the torque sensor 600, the strain body 621 (outer peripheral member 620) faces the inner peripheral member 610 with a gap 640 in between. Thereby, in the torque sensor 600, the second elastic portion 622 of the strain body 621 is easily strained and deformed, and stress can be detected with high sensitivity.
トルクセンサ600においては、凹部612が形成されていることにより、内周部材610の軸方向下側の端部付近の肉厚が薄くなっているため、接触部611が軸方向下側に向かって弾性変形しやすくなっている。これにより、第2の軸受602に対して軸方向下側に向かって予圧がかけられている場合においても、接触部611が弾性変形することにより、予圧による影響を吸収することができる。したがって、トルクセンサ600においては、第2の軸受602に対する予圧が第2の弾性部分622のひずみとして現れることが抑制され、ひずみセンサ603が応力を高感度に検出することができる。
In the torque sensor 600, the wall thickness near the axially lower end of the inner circumferential member 610 is thinner due to the formation of the recessed portion 612, so that the contact portion 611 moves toward the axially lower side. Easily deformed elastically. As a result, even when a preload is applied to the second bearing 602 downward in the axial direction, the contact portion 611 is elastically deformed, so that the influence of the preload can be absorbed. Therefore, in the torque sensor 600, the preload on the second bearing 602 is suppressed from appearing as strain in the second elastic portion 622, and the strain sensor 603 can detect stress with high sensitivity.
次に、センサ装置500における、トルクセンサ600よりも軸方向上側の部分について説明する。センサ装置500における、トルクセンサ600よりも軸方向上側の部分は、第4の実施の形態にかかるセンサ装置400と略同一の構成を有する。ただし、センサ装置500においては、第4の実施の形態にかかるセンサ装置400のホルダ404の固定部143に相当するものはなく、4つの板部541が、ホルダ504の内周部材610の軸方向上側の端面に、軸方向上側に向かって直接立設されている。
Next, a portion of the sensor device 500 above the torque sensor 600 in the axial direction will be described. A portion of the sensor device 500 above the torque sensor 600 in the axial direction has substantially the same configuration as the sensor device 400 according to the fourth embodiment. However, in the sensor device 500, there is no fixed portion 143 of the holder 404 of the sensor device 400 according to the fourth embodiment, and the four plate portions 541 are arranged in the axial direction of the inner peripheral member 610 of the holder 504. It is erected directly on the upper end face toward the upper side in the axial direction.
4つの板部541は、径方向において、第1の軸受501の外側に、軸Xの周りに4回対称となる位置に配置されている。周方向において、4つの板部541は、4つの起歪体621に対応する位置に配置されている。それぞれの板部541は、伝達部545の径方向内側の先端部545aを介して第1の軸受501の外周側501bに接触している。このようにして、ホルダ504は、第1の軸受501を保持している。なお、第1の軸受501は、軸方向において、内周部材610の軸方向上側の端面よりも上側に配置されている。
The four plate parts 541 are arranged at four-fold symmetrical positions around the axis X on the outside of the first bearing 501 in the radial direction. In the circumferential direction, the four plate portions 541 are arranged at positions corresponding to the four strain bodies 621. Each plate portion 541 is in contact with the outer peripheral side 501b of the first bearing 501 via the radially inner tip portion 545a of the transmission portion 545. In this way, the holder 504 holds the first bearing 501. Note that the first bearing 501 is arranged above the axially upper end surface of the inner circumferential member 610 in the axial direction.
それぞれの板部541は、ひずみゲージ102を保持している。すなわち、センサ装置500のホルダ504は、平面視時計回りに、第1の板部541aに保持された第1のひずみゲージ102a、第2の板部541bに保持された第2のひずみゲージ102b、第3の板部541cに保持された第3のひずみゲージ102c、第4の板部541dに保持された第4のひずみゲージ102dの合計4つのひずみゲージ102を保持している。
Each plate portion 541 holds a strain gauge 102. That is, the holder 504 of the sensor device 500 includes, clockwise in plan view, the first strain gauge 102a held by the first plate part 541a, the second strain gauge 102b held by the second plate part 541b, A total of four strain gauges 102 are held, including a third strain gauge 102c held by a third plate part 541c and a fourth strain gauge 102d held by a fourth plate part 541d.
周方向において隣り合う2つのひずみゲージ102、例えば、第1のひずみゲージ102aと第2のひずみゲージ102bとは、軸Xを含む平面に関して対称となる位置に配置されている。センサ装置500において、軸Xから第1のひずみゲージ102aへ向かう方向と、軸Xから第2のひずみゲージ102bへ向かう方向とがなす角度は、90°となっている。4つの板部541は全て同一の構成を有するため、以降、1つの板部541のみを詳細に説明し、他の板部541については必要な場合を除いて詳細な説明を省略する。
Two strain gauges 102 adjacent in the circumferential direction, for example, the first strain gauge 102a and the second strain gauge 102b, are arranged at symmetrical positions with respect to a plane containing the axis X. In the sensor device 500, the angle between the direction from the axis X toward the first strain gauge 102a and the direction from the axis X toward the second strain gauge 102b is 90°. Since all four plate parts 541 have the same configuration, only one plate part 541 will be explained in detail hereafter, and detailed explanation of the other plate parts 541 will be omitted unless necessary.
径方向において、板部541の内側の面には、接線方向に延びる側面視半円形の凹部544が形成されている。凹部544は、板部541の、軸方向下側の端部近傍に形成されている。板部541においては、凹部544が形成された部分は肉厚が薄くなっており、弾性的なひずみ変形が可能な第1の弾性部分542となっている。ひずみゲージ102は、第1の弾性部分542の径方向外側の面に取り付けられている。第1の弾性部分542のひずみ変形は、ひずみゲージ102の抵抗値の変化として検出可能となっている。板部541の接線方向中央部、かつ凹部544よりも軸方向上側には、径方向に貫通する円形の孔である開口部541hが形成されている。開口部541hには、ピン状の伝達部545が挿入されている。伝達部545は、開口部541hに、接着または圧入により固定されている。
In the radial direction, a recess 544 that is semicircular in side view and extends in the tangential direction is formed on the inner surface of the plate portion 541. The recessed portion 544 is formed near the lower end of the plate portion 541 in the axial direction. In the plate portion 541, the portion where the recessed portion 544 is formed has a thinner wall thickness, and serves as a first elastic portion 542 capable of elastic strain deformation. Strain gauge 102 is attached to the radially outer surface of first elastic portion 542 . Strain deformation of the first elastic portion 542 can be detected as a change in the resistance value of the strain gauge 102. An opening 541h, which is a circular hole penetrating in the radial direction, is formed in the central portion of the plate portion 541 in the tangential direction and above the recess 544 in the axial direction. A pin-shaped transmission portion 545 is inserted into the opening 541h. The transmission portion 545 is fixed to the opening 541h by adhesive or press fitting.
伝達部545は、先の尖った先端部545aを有する。伝達部545は、径方向において、先端部545aが板部541よりも内側へ突出するように配置されている。第1の軸受501の外周側501bは、伝達部545の先端部545aに点接触している。したがって、伝達部545は、先端部545aを介して、第1の軸受501の変位を板部541へ伝達することができる。
The transmission section 545 has a pointed tip 545a. The transmission portion 545 is arranged such that the tip portion 545a protrudes inward from the plate portion 541 in the radial direction. The outer peripheral side 501b of the first bearing 501 is in point contact with the tip 545a of the transmission section 545. Therefore, the transmission portion 545 can transmit the displacement of the first bearing 501 to the plate portion 541 via the tip portion 545a.
図8において、偏心部材103の最大厚部分103aは、第3の板部541cと近い位置にあり、偏心部材103の最小厚部分103bは、第1の板部541aと近い位置にある。そのため、第3の板部541cは、第1の軸受501によって径方向外側へ向かって押圧されている。なお、第3の板部541cに隣り合う第2の板部541bおよび第4の板部541dも、第1の軸受501によって径方向外側へ僅かに押圧されている。
In FIG. 8, the maximum thickness portion 103a of the eccentric member 103 is located close to the third plate portion 541c, and the minimum thickness portion 103b of the eccentric member 103 is located close to the first plate portion 541a. Therefore, the third plate portion 541c is pressed radially outward by the first bearing 501. Note that the second plate portion 541b and the fourth plate portion 541d adjacent to the third plate portion 541c are also slightly pressed radially outward by the first bearing 501.
したがって、図8においては、第3の板部541cの第1の弾性部分542が最も大きくひずみ変形をしており、第3の板部541cの軸方向上側が、径方向外側に向かって反りかえった状態となっている。第3の板部541cに隣り合う第2の板部541bおよび第4の板部541dの第1の弾性部分542は、僅かにひずみ変形した状態にある。第1の板部541aの第1の弾性部分542は、最もひずみ変形をしていない状態、または全くひずみ変形をしていない状態にある。
Therefore, in FIG. 8, the first elastic portion 542 of the third plate portion 541c has undergone the largest strain deformation, and the upper side of the third plate portion 541c in the axial direction is warped toward the outside in the radial direction. The situation is as follows. The first elastic portions 542 of the second plate portion 541b and the fourth plate portion 541d adjacent to the third plate portion 541c are in a slightly strained state. The first elastic portion 542 of the first plate portion 541a is in a state where it is least strained or not strained at all.
シャフトSが回転すると、シャフトSに固定された偏心部材103も共に回転し、それに伴い、第1の軸受501の中心軸Yも軸Xの周りを回転する。例えば、シャフトSが平面視時計回りに回転すると、第1の軸受501の中心軸Yは軸Xの周りに平面視時計回りに回転する。図8の状態から、第1の軸受501の中心軸Yが軸Xの周りに平面視時計回りに90°回転すると、第4の板部541dの第1の弾性部分542が最もひずみ変形をした状態へ遷移する。
When the shaft S rotates, the eccentric member 103 fixed to the shaft S also rotates, and the central axis Y of the first bearing 501 also rotates around the axis X accordingly. For example, when the shaft S rotates clockwise in a plan view, the central axis Y of the first bearing 501 rotates around the axis X in a clockwise direction in a plan view. When the central axis Y of the first bearing 501 rotates 90° clockwise in plan view from the state shown in FIG. 8, the first elastic portion 542 of the fourth plate portion 541d undergoes the most strain deformation. Transition to state.
このように、本実施の形態にかかるセンサ装置500においては、第1の軸受501の中心軸Yが軸Xの周りに平面視時計回りに90°回転する度に、順に、第3の板部541c、第4の板部541d、第1の板部541a、第2の板部541bの第1の弾性部分542が最もひずみ変形をした状態へ遷移する。したがって、それぞれの板部541に取り付けられたひずみゲージ102により、シャフトSの回転角度を検出することができる。
In this way, in the sensor device 500 according to the present embodiment, each time the central axis Y of the first bearing 501 rotates 90° clockwise in plan view around the axis X, the third plate portion 541c, the fourth plate portion 541d, the first plate portion 541a, and the first elastic portion 542 of the second plate portion 541b transition to the most strained state. Therefore, the rotation angle of the shaft S can be detected by the strain gauges 102 attached to each plate portion 541.
本実施の形態にかかるセンサ装置500は、第4の実施の形態にかかるセンサ装置400について上記した特性を同様に有する。また、本実施の形態にかかるセンサ装置500は、トルクセンサ600とホルダ504とが一体に形成されている。したがって、電動アシスト自転車への適用時等、回転角度の検出のためのセンサ(ケイデンスセンサ等)およびトルクセンサの両方を実装させる場合に、全体として小型化が可能となる。
The sensor device 500 according to the present embodiment similarly has the characteristics described above for the sensor device 400 according to the fourth embodiment. Further, in the sensor device 500 according to this embodiment, the torque sensor 600 and the holder 504 are integrally formed. Therefore, when both a sensor for detecting a rotation angle (cadence sensor, etc.) and a torque sensor are mounted, such as when applied to a power-assisted bicycle, the overall size can be reduced.
本実施の形態にかかるセンサ装置500は、周方向において、板部541へ取り付けられるひずみゲージ102と、トルクセンサ600へ取り付けられるひずみセンサ603とが、対応する位置に配置されている。また、ひずみセンサ603がひずみゲージである場合、全てのひずみゲージ102およびひずみセンサ603が同じ向き(典型的には、長手方向が軸方向に一致する向き)となる。以上より、ひずみゲージ102およびひずみセンサ603を取り付ける際の作業性が向上する。
In the sensor device 500 according to the present embodiment, the strain gauge 102 attached to the plate portion 541 and the strain sensor 603 attached to the torque sensor 600 are arranged at corresponding positions in the circumferential direction. Further, when the strain sensor 603 is a strain gauge, all the strain gauges 102 and the strain sensor 603 are oriented in the same direction (typically, the longitudinal direction is oriented in the same direction as the axial direction). As described above, the workability when attaching the strain gauge 102 and the strain sensor 603 is improved.
さらに、本実施の形態にかかるセンサ装置500においては、シャフトSが傾こうとする力によりホルダ504に発生する応力が、軸方向下側に配置されたトルクセンサ600の外周部材620によって吸収されるため、当該応力が、軸方向上側に配置されたひずみゲージ102に影響を及ぼすことを抑制することができる。したがって、本実施の形態にかかるセンサ装置500においては、シャフトSの回転角度をより精度よく検出することができる。
Furthermore, in the sensor device 500 according to the present embodiment, the stress generated in the holder 504 due to the force that causes the shaft S to tilt is absorbed by the outer peripheral member 620 of the torque sensor 600 disposed on the lower side in the axial direction. Therefore, it is possible to suppress the stress from affecting the strain gauge 102 disposed on the upper side in the axial direction. Therefore, in the sensor device 500 according to the present embodiment, the rotation angle of the shaft S can be detected with higher accuracy.
以上、本発明のセンサ装置について、好ましい実施の形態を挙げて説明したが、本発明のセンサ装置は上記実施の形態の構成に限定されるものではない。例えば、上記実施の形態にかかる各センサ装置は、電動アシスト自転車のケイデンスセンサとして用いられることを想定して記載されているが、本発明のセンサ装置は、電動アシスト自転車のケイデンスセンサとして用いられるものに限られない。
Although the sensor device of the present invention has been described above with reference to preferred embodiments, the sensor device of the present invention is not limited to the configuration of the above embodiments. For example, each sensor device according to the above embodiments is described with the assumption that it will be used as a cadence sensor for an electrically assisted bicycle, but the sensor device of the present invention is one that is used as a cadence sensor for an electrically assisted bicycle. Not limited to.
上記実施の形態にかかる各センサ装置において、軸受とシャフトとの間には偏心部材が配置されているが、本発明のセンサ装置はこれに限られず、偏心部材を用いずに軸受とシャフトとを互いに偏心させてもよい。たとえば、それ自体が偏心した形状を有するシャフトまたは軸受を用いてもよい。また、シャフトと軸受との間に樹脂等を充填して硬化させることで、軸受とシャフトとを互いに偏心させてもよい。さらに、偏心部材を用いる場合であっても、偏心部材の形状は特に限定されない。例えば、シャフトの外周面に突起部を設け、これを偏心部材としてもよい。
In each of the sensor devices according to the embodiments described above, an eccentric member is arranged between the bearing and the shaft, but the sensor device of the present invention is not limited to this, and the sensor device of the present invention can connect the bearing and the shaft without using an eccentric member. They may be eccentric to each other. For example, shafts or bearings that themselves have an eccentric shape may be used. Alternatively, the bearing and the shaft may be made eccentric to each other by filling a resin or the like between the shaft and the bearing and hardening the resin. Furthermore, even if an eccentric member is used, the shape of the eccentric member is not particularly limited. For example, a protrusion may be provided on the outer peripheral surface of the shaft, and this may be used as an eccentric member.
上記実施の形態にかかる各センサ装置においては、4つのひずみゲージが用いられていたが、ひずみゲージの数は、1つであってもよく、2つであってもよく、3つであってもよく、5つ以上であってもよい。ひずみゲージの数が1つの場合であっても、回転の速度を検出することは可能である。ただし、回転角度の検出のためには、ひずみゲージの数は2つ以上であることが好ましい。
In each sensor device according to the above embodiments, four strain gauges were used, but the number of strain gauges may be one, two, or three. The number may be five or more. Even when the number of strain gauges is one, it is possible to detect the speed of rotation. However, in order to detect the rotation angle, it is preferable that the number of strain gauges is two or more.
上記実施の形態にかかる各センサ装置においては、第1のひずみゲージと前記第2のひずみゲージとが、シャフトの中心軸を含む平面に関して対称となる位置に配置され、シャフトの中心軸から第1のひずみゲージへ向かう方向と、シャフトの中心軸から第2のひずみゲージへ向かう方向とがなす角度が、90°となっている。しかしながら、当該角度は、どのような角度であってもよい。ただし、回転角度の検出のためには、当該角度は180°ではないことが好ましい。
In each of the sensor devices according to the above embodiments, the first strain gauge and the second strain gauge are arranged at symmetrical positions with respect to a plane including the central axis of the shaft, and The angle between the direction toward the second strain gauge and the direction from the central axis of the shaft toward the second strain gauge is 90°. However, the angle may be any angle. However, in order to detect the rotation angle, it is preferable that the angle is not 180°.
第5の実施の形態にかかるセンサ装置500においては、トルクセンサ600よりも軸方向上側の部分は、第4の実施の形態にかかるセンサ装置400と略同一の構成を有していたが、トルクセンサ600よりも軸方向上側の部分は、上記他の実施の形態にかかるセンサ装置と略同一の構成となっていてもよい。
In the sensor device 500 according to the fifth embodiment, the portion above the torque sensor 600 in the axial direction has substantially the same configuration as the sensor device 400 according to the fourth embodiment, but the torque A portion above the sensor 600 in the axial direction may have substantially the same configuration as the sensor device according to the other embodiments described above.
その他、当業者は、従来公知の知見に従い、本発明のセンサ装置を適宜改変し、また各種構成の組み合わせを変更することができる。かかる変更によってもなお本発明の構成を具備する限り、勿論、本発明の範疇に含まれるものである。
In addition, those skilled in the art can appropriately modify the sensor device of the present invention and change the combinations of various configurations according to conventionally known knowledge. As long as such changes still have the structure of the present invention, they are, of course, included within the scope of the present invention.
In addition, those skilled in the art can appropriately modify the sensor device of the present invention and change the combinations of various configurations according to conventionally known knowledge. As long as such changes still have the structure of the present invention, they are, of course, included within the scope of the present invention.
S…シャフト、100,200,300,400,500…センサ装置、101,501…軸受(第1の軸受)、101a,501a…内周側、101b,501b…外周側、102…ひずみゲージ、103,303…偏心部材、104,204,404,504…ホルダ、445,545…伝達部、441h,541h…開口部、600…トルクセンサ。
S...Shaft, 100,200,300,400,500...Sensor device, 101,501...Bearing (first bearing), 101a, 501a...Inner circumference side, 101b, 501b...Outer circumference side, 102...Strain gauge, 103 , 303... Eccentric member, 104, 204, 404, 504... Holder, 445, 545... Transmission section, 441h, 541h... Opening, 600... Torque sensor.
Claims (9)
- シャフトと、
内周側および外周側を有する軸受と、
前記軸受の前記外周側に直接または他の部材を介して取り付けられたひずみゲージと、を有し、
径方向において、前記シャフトは、前記軸受の前記内周側の内側に配置され、
前記軸受と前記シャフトとは、互いに偏心している、センサ装置。 shaft and
a bearing having an inner circumferential side and an outer circumferential side;
a strain gauge attached directly to the outer peripheral side of the bearing or via another member;
In the radial direction, the shaft is arranged inside the inner peripheral side of the bearing,
In the sensor device, the bearing and the shaft are eccentric to each other. - 前記軸受の前記内周側と前記シャフトとの間に偏心部材が配置されており、
前記偏心部材は、前記軸受と前記シャフトとを互いに偏心させる、請求項1に記載のセンサ装置。 An eccentric member is disposed between the inner peripheral side of the bearing and the shaft,
The sensor device according to claim 1, wherein the eccentric member makes the bearing and the shaft eccentric to each other. - 前記偏心部材は環状部材である、請求項2に記載のセンサ装置。 The sensor device according to claim 2, wherein the eccentric member is an annular member.
- 前記偏心部材は楔である、請求項2に記載のセンサ装置。 The sensor device according to claim 2, wherein the eccentric member is a wedge.
- 前記ひずみゲージは、第1のひずみゲージと第2のひずみゲージとを含む複数のひずみゲージであり、
前記第1のひずみゲージと前記第2のひずみゲージとは、前記シャフトの中心軸を含む平面に関して対称となる位置に配置される、請求項1に記載のセンサ装置。 The strain gauge is a plurality of strain gauges including a first strain gauge and a second strain gauge,
The sensor device according to claim 1, wherein the first strain gauge and the second strain gauge are arranged at symmetrical positions with respect to a plane containing the central axis of the shaft. - 前記ひずみゲージを保持するホルダを有する、請求項1に記載のセンサ装置。 The sensor device according to claim 1, further comprising a holder that holds the strain gauge.
- 前記軸受の変位を前記ホルダに伝達する伝達部を有し、
前記ホルダは開口部を備え、
前記伝達部は、前記開口部に配置される、請求項6に記載のセンサ装置。 a transmission part that transmits displacement of the bearing to the holder;
the holder includes an opening;
The sensor device according to claim 6, wherein the transmission section is arranged in the opening. - トルクセンサを有し、
前記ひずみゲージは、軸方向の一方側に配置され、
前記トルクセンサは、軸方向の他方側に配置される、請求項1に記載のセンサ装置。 Has a torque sensor,
The strain gauge is arranged on one side in the axial direction,
The sensor device according to claim 1, wherein the torque sensor is arranged on the other side in the axial direction. - 前記ひずみゲージを保持するホルダを有し、前記ホルダは前記トルクセンサのホルダと一体に形成されている、請求項8に記載のセンサ装置。 The sensor device according to claim 8, further comprising a holder that holds the strain gauge, and the holder is formed integrally with a holder of the torque sensor.
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56163410A (en) * | 1980-05-22 | 1981-12-16 | Mitsubishi Electric Corp | Abrasion detector of plain bearing |
JP2001515415A (en) * | 1995-10-09 | 2001-09-18 | オハイオ エレクトロニック イングレイバーズ インク | Engraving method and equipment |
US20210095999A1 (en) * | 2019-10-01 | 2021-04-01 | Infineon Technologies Ag | Sensing of a rotational angle |
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2022
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- 2023-04-25 TW TW112115238A patent/TW202344804A/en unknown
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56163410A (en) * | 1980-05-22 | 1981-12-16 | Mitsubishi Electric Corp | Abrasion detector of plain bearing |
JP2001515415A (en) * | 1995-10-09 | 2001-09-18 | オハイオ エレクトロニック イングレイバーズ インク | Engraving method and equipment |
US20210095999A1 (en) * | 2019-10-01 | 2021-04-01 | Infineon Technologies Ag | Sensing of a rotational angle |
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