CN203612162U - Torque sensor, drive unit and electric assisted bicycle - Google Patents
Torque sensor, drive unit and electric assisted bicycle Download PDFInfo
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- CN203612162U CN203612162U CN201320676225.XU CN201320676225U CN203612162U CN 203612162 U CN203612162 U CN 203612162U CN 201320676225 U CN201320676225 U CN 201320676225U CN 203612162 U CN203612162 U CN 203612162U
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Abstract
The utility model relates to a torque sensor, a drive unit and an electric assisted bicycle. The torque sensor comprises a bottom plate; a crankset with a plurality of teeth engaged with a chain at the periphery; a rotation guiding part used for guiding the bottom plate to rotate relative to the crankset; an elastic part which has elastic deformation through the relative rotation of the bottom plate; an inner side magnet part fixed at the bottom part; an outer side magnet part fixed at the crankset; and a detection part used for detecting the circumferential relative position of the inner side magnet part relative to the outer side magnet part; the inner side magnet part includes a first circular yoke and a plurality of first magnets arranged on the first yoke circumferentially and contacted with the first yoke directly or indirectly through binder; the outer side magnet part includes a second circular yoke and a plurality of second magnets arranged on the second yoke at the radial outer side of a plurality of first magnets circumferentially and contacted with the second yoke directly or indirectly through binder.
Description
Technical field
The utility model relates to the torque sensor that a kind of electrically assisted bicycle is used.
Background technology
All the time, use a kind of electrically assisted bicycle of assisting the power of steerman pushes pedals by electro-motor.In Japanese Patent Publication communique 2012-187963 communique, disclosed electrically assisted bicycle comprises the torque master that calculates the pedal force based on manpower.Torque master comprises axial region swivel and tooth portion swivel.Axial region swivel is arranged at the crank shaft of manpower driving system.Tooth portion swivel links by elastic body and axial region swivel.In the time that effect has pedal force, elastic body is compressed, between axial region swivel and tooth portion swivel, produces phase difference.
There is the first support of the first magnetizing part by the arranged in order of the N utmost point, the S utmost point with angle uniformly-spaced in the setting of axial region swivel.There is the second support of the second magnetizing part by the arranged in order of the N utmost point, the S utmost point with angle uniformly-spaced in the swivel setting of tooth portion.Detect the magnetic field of the first magnetizing part by Hall element with roughly sinuous detection signal output.And, also detect the magnetic field of the second magnetizing part with roughly sinuous detection signal output.Calculate the above-mentioned phase difference that is equivalent to pedal force according to these detection signals.
In No. 2675543 specification sheets of Chinese utility model bulletin, disclosed electrically assisted bicycle comprises external cam 7 and cam ring 8.External cam 7 links by spring 11 and cam ring 8.The axis of spring 11 is positioned on the circumference centered by the axle center of axis 2.
But, in the disclosed torque master of Japanese Patent Publication communique 2012-187963 communique, if the skew of the position of magnetizing part causes the accuracy of detection of torque to decline.And, in the time that the magnetic flux from multiple magnetizing parts is at random, also cause the accuracy of detection of torque to decline.
Utility model content
The utility model completes in view of the aforementioned technical background, and its object is to detect accurately the circumferential relative position of inner side magnet portion with respect to outside magnet portion.
The torque sensor that exemplary electrically assisted bicycle of the present utility model is used has: base plate is connected with crank on the central axis of this base plate; Chain wheel, it is circular centered by described central axis, and has the multiple teeth that engage with chain at peripheral part; Rotation guide portion, it guides described base plate that it can be rotated relatively with respect to described chain wheel; Elastic portion, its by described base plate with respect to the relative rotation of described chain wheel and elastic deformation; Inner side magnet portion, it is circular centered by described central axis, and is fixed on described base plate; Outside magnet portion, it is circular centered by described central axis, and is positioned at the radial outside of described inner side magnet portion, and is fixed on described chain wheel; And test section, it detects the circumferential relative position of described inner side magnet portion with respect to described outside magnet portion, wherein, described inner side magnet portion has: the first circular yoke, its centered by described central axis along the Directional Extension vertical with described central axis; And multiple the first magnet, described multiple the first magnet is along being circumferentially configured on the side vertical with described central axis of described the first yoke, and directly or by adhesive agent indirectly contact with described the first yoke, described outside magnet portion has: the second circular yoke, its centered by described central axis along the Directional Extension vertical with described central axis; And multiple the second magnet, described multiple the second magnet is circumferentially disposed on the side vertical with described central axis of described the second yoke on the radial outside edge of described multiple the first magnet, and directly or by adhesive agent indirectly contact with described the second yoke, the number of described multiple the first magnet is even number, the pole orientation of each the first magnet is contrary along the pole orientation of the first circumferentially adjacent magnet separately with them, the number of described multiple the second magnet is even number, and the pole orientation of each the second magnet is contrary along the pole orientation of the second circumferentially adjacent magnet separately with them.
Described inner side magnet portion also has the first magnet accommodation section on the described side of being fixed on described the first yoke, described multiple the first magnet is contained in respectively in the multiple hole portion that is arranged at described the first magnet accommodation section, described outside magnet portion also has the second magnet accommodation section on the described side that is fixed on described the second yoke, and described multiple the second magnet is contained in respectively in the multiple hole portion that is arranged at described the second magnet accommodation section.
Described multiple the first magnet is pressed into respectively in the described multiple hole portion of described the first magnet accommodation section, and described multiple the second magnet is pressed into respectively in the described multiple hole portion of described the second magnet accommodation section.
Described multiple the first magnet contacts at the inside face of the described multiple hole of the multiple positions that are circumferentially separated from each other along hole portion and described the first magnet accommodation section portion respectively, and described multiple the second magnet contacts at the inside face of the described multiple hole of the multiple positions that are circumferentially separated from each other along hole portion and described the second magnet accommodation section portion respectively.
Described elastic portion is axially overlapping with described the first yoke and described the second yoke.
Be positioned at the contact part by the position of radial outside than described elastic portion in described base plate setting, at described chain wheel, the first retainer is set, described the first retainer be positioned at than described elastic portion by the position of radial outside and with described contact part circumferentially opposed, described elastic portion is compressive state, described base plate is not being applied under the state of pedal force, described contact part presses on described the first retainer by the recuperability of described elastic portion, the contact surface contacting with described the first retainer of described contact part and the contact surface contacting with described contact part of described the first retainer are perpendicular to circumferentially.
Described contact part is by forming bending vertically on the vertical wiggle of the described contact surface with respect to contacting with described the first retainer a part for described base plate, or described the first retainer is by forming a part for described chain wheel bending vertically on the vertical wiggle of the described contact surface with respect to contact with described contact part.
The second retainer is also set on described chain wheel, described the second retainer is positioned at than described elastic portion and circumferentially separates by the position of radial outside and with described the first retainer edge, and described the second retainer and described contact part are circumferentially opposed, described contact site is between described the first retainer and described the second retainer, become large along with putting on the pedal force of described base plate, described elastic portion is compressed, described contact part moves along the direction that tends to described the second retainer from described the first retainer, be greater than at the pedal force that puts on described base plate under the state of prescribed level, described contact part presses on described the second retainer, the circumferential lengths of described the second retainer is greater than the circumferential lengths of described the first retainer.
In described base plate, described contact part be formed as than than this contact part by the position of radially inner side axially away from described chain wheel.
Described elastic portion is the coil spring of linearly extension, at described base plate, the first jut is set, described the first jut is along circumferentially giving prominence to and being housed inside in a side the end of described elastic portion, at described chain wheel, the second jut is set, described the second jut and described the first jut are circumferentially given prominence on circumferential opposed and edge, and described the second jut is housed inside in the opposing party's the end of described elastic portion, the edge of the radial outside of the jut of the side in described the first jut and described the second jut is along circumferentially extending, the edge of the radial outside of the jut of the opposing party in described the first jut and described the second jut tends to radially inner side along with the jut near one.
Described elastic portion is the coil spring of linearly extension, at described base plate, the first jut is set, described the first jut is along circumferentially giving prominence to and being housed inside in a side the end of described elastic portion, at described chain wheel, the second jut is set, described the second jut and described the first jut are circumferentially given prominence on circumferential opposed and edge, and described the second jut is accommodated in the opposing party's the end of described elastic portion, the edge of the radially inner side of the jut of the side in described the first jut and described the second jut tends to radial outside along with the jut near the opposing party.
Described elastic portion is the coil spring of linearly extension, at described base plate, the first jut is set, described the first jut is along circumferentially giving prominence to and being accommodated in a side the end of described elastic portion, at described chain wheel, the second jut is set, described the second jut and described the first jut are circumferentially given prominence on circumferential opposed and edge, and described the second jut is accommodated in the opposing party's the end of described elastic portion, the edge of the radially inner side of the jut of the side in described the first jut and described the second jut tends to radial outside along with the jut near the opposing party, the edge of the radial outside of described the opposing party's jut tends to radially inner side along with the jut near one.
Described test section has the inner side test section of the described inner side of detection magnet portion and the outside test section of the described outside of detection magnet portion, and the axial distance between described the first magnet and described inner side test section is less than the axial distance between described the second magnet and described outside test section.
The driver element that electrically assisted bicycle is used, it comprises torque sensor, electro-motor and the control part with said structure, described control part is according to from the signal of described torque sensor output, described electro-motor being exported to control signal.
A kind of electrically assisted bicycle, it has front-wheel, trailing wheel, vehicle frame, battery and driver element, described vehicle frame connects described front-wheel and described trailing wheel, in this electrically assisted bicycle, provide auxiliary power from the described electro-motor of described driver element at least one party described front-wheel and described trailing wheel.
According to the utility model, can detect accurately the circumferential relative position of inner side magnet portion with respect to outside magnet portion.
Accompanying drawing explanation
Fig. 1 is the lateral plan of electrically assisted bicycle.
Fig. 2 is the left side view of torque sensor.
Fig. 3 is the right side view of torque sensor.
Fig. 4 is the left side view of base plate.
Fig. 5 is the left side view of chain wheel.
Fig. 6 is the left side view of base plate and chain wheel.
Fig. 7 is the left side view that amplifies the part that base plate and chain wheel are shown.
Fig. 8 is the right side view of inner side magnet portion.
Fig. 9 is the right side view of base plate and inner side magnet portion.
Figure 10 is the cutaway view of inner side magnet portion.
Figure 11 amplifies the right side view that the first magnet is shown.
Figure 12 is the right side view of outside magnet portion.
Figure 13 is the right side view of chain wheel and outside magnet portion.
Figure 14 is the cutaway view of outside magnet portion.
Figure 15 amplifies the right side view that the second magnet is shown.
Figure 16 is the right side view of inner side magnet portion and outside magnet portion.
Figure 17 is the cutaway view of inner side magnet portion, outside magnet portion and test section.
The specific embodiment
In this manual, by the upside of Fig. 1 of the electrically assisted bicycle of standing state referred to as " upside ", by downside referred to as " downside ".And the right side during by electrically assisted bicycle from the vertical state of front side observation station is referred to as " right side ", by left side referred to as " left side ".In addition, the direction parallel with the central axis J1 of torque sensor is called to " axially ", by centered by central axis J1 radially referred to as " radially ", by centered by central axis J1 circumferentially referred to as " circumferentially ".
Fig. 1 is the lateral plan that the related electrically assisted bicycle 1 of an exemplary embodiment of the present utility model is shown.Electrically assisted bicycle 1 is the bicycle of assisting the power of steerman pushes pedals by electro-motor.Electrically assisted bicycle 1 comprises vehicle frame 11, front-wheel 12, trailing wheel 13, handlebar 14, saddle 15, chain 16, crank 31, two pedals 32, torque sensor 2, electro-motor 41, battery 42 and control parts 43.In the following description by electro-motor 41 referred to as " motor 41 ".
Motor 41 is installed on front-wheel 12.Battery 42 is installed on battery pedestal, and described battery pedestal is arranged on vehicle frame 11 below saddle 15.Battery 42 provides electric power to motor 41.Motor 41 is by driving from the electric power of battery 42, and provides auxiliary power to front-wheel 12.Control part 43 is according to the driving of pedal force control motor 41.In other words, control part 43 is exported control signal according to the signal of exporting from torque sensor 2 to motor 41.In the following description, torque sensor 2, motor 41 and control part 43 are referred to as to " driver element 40 ".
Fig. 2 is the left side view of torque sensor 2.Fig. 3 is the right side view of torque sensor 2.Torque sensor 2 comprises base plate 21, chain wheel 22, six elastic portion 23, inner side magnet portion 24 and outside magnet portions 25.Outside magnet portion 25 is disposed at the radial outside of inner side magnet portion 24.Not shown roughly circular plain bearing is set between inner side magnet portion 24 and outside magnet portion 25.This plain bearing is that guiding base plate 21 makes it can counterrotating rotation guide portion with respect to chain wheel 22.The structure of rotation guide portion also can suitably change.
There is elastic deformation by base plate 21 with respect to the relative rotation of chain wheel 22 respectively in six elastic portion 23.Elastic portion 23 is for being tangentially the coil spring that roughly linearity extends.Each elastic portion 23 along centered by the central axis J1 of torque sensor 2 circumferentially with equal angles arranged spaced roughly.
Fig. 4 is the left side view of base plate 21.Base plate 21 is the roughly circular sheet material parts centered by central axis J1.Base plate 21 comprises central portion 211, six male part 212, six contact parts 213 and six the first juts 214.
Each male part 212 is expanded towards radial outside from the neighboring of central portion 211.Six male part 212 configure so that roughly edge, equal angles interval is circumferential around central portion 211.Contact part 213 is outstanding towards radial outside from the edge of the radial outside of each male part 212.Boundary portion between contact part 213 and male part 212 is to be the stage portion of left lateral bending to the front side in Fig. 4.Therefore, contact part 213 is axially being positioned at than the keep left position of side of male part 212.Axially consistent with above-mentioned left and right directions.
Forward edge in the clockwise direction front side of each male part 212 arranges the first jut 214.The first jut 214 is given prominence to along circumferential with the clockwise direction Fig. 3 from this forward edge.Multiple the first juts 214 towards week same direction upwards outstanding.The edge 215 of the radial outside of the first jut 214 circumferentially tends to radially inner side away from male part 212 along with edge.The edge 216 of the radially inner side of the first jut 214 is substantially along circumferentially extending.Because the circumferential lengths at edge 216 is shorter, even if therefore edge 216 tangentially linearly extension substantially also can be regarded edge 216 as substantially along circumferentially extending.
Fig. 5 is the left side view of chain wheel 22.Chain wheel 22 is the roughly circular sheet material parts centered by central axis J1.Chain wheel 22 has with chain 16(with reference to figure 1 at peripheral part) multiple teeth 229 of engaging.The first opening 220 of circular is set in the central authorities of chain wheel 22.Around the first opening 220 with equal angles interval roughly along circumferential six the second openings 221 of configuration.Six the second openings 221 are positioned at the perimembranous of chain wheel 22.Each the second opening 221 is essentially rectangular.The interior perimembranous of chain wheel 22 is by radial outside and than having the peripheral part of multiple teeth 229 by the position of radially inner side than the first opening 220.
Near the edge of the radial outside of each the second opening 221, be extruded with vertically the second retainer 223 towards left side.Six the second retainers 223 are with roughly circumferentially configuration of edge, equal angles interval.Six the first retainers 222 and six the second retainers 223 are along circumferential alternate configurations.Each the second retainer 223 is along circumferentially separating with the first retainer 222.The second retainer 223 is by forming a part for the interior perimembranous of chain wheel 22 substantially along bending vertically on the wiggle circumferentially extending.The circumferential lengths of the second retainer 223 is greater than the circumferential lengths of the first retainer 222.
Forward edge in the clockwise direction front side of each the second opening 221 arranges the second jut 224.The second jut 224 is given prominence to along circumferential with the anticlockwise direction Fig. 5 from this forward edge.Multiple the second juts 224 towards week same direction upwards outstanding.The edge 225 of the radial outside of the second jut 224 is substantially along circumferentially extending.Because the circumferential lengths at edge 225 is shorter, even if therefore edge 225 tangentially linearly extension substantially also can be regarded edge 225 as substantially along circumferentially extending.The edge 226 of the radially inner side of the second jut 224 tends to radial outside along with the clockwise direction rear side in Fig. 5.
Fig. 6 is the left side view of base plate 21 and chain wheel 22.Base plate 21 is positioned at the left side of chain wheel 22.Be arranged at each contact part 213 of peripheral part of base plate 21 between first retainer 222 and the second retainer 223 of interior perimembranous that is arranged on chain wheel 22.Contact part 213 is positioned at the clockwise direction front side of the first retainer 222 and the clockwise direction rear side of the second retainer 223.Contact part 213 respectively with the first retainer 222 and the second retainer 223 circumferentially opposed.In Fig. 6, contact part 213 contacts with the first retainer 222.
The interior perimembranous of contact part 213 and chain wheel 22 is at axial overlap.As mentioned above, contact part 213 is axially being positioned at than the keep left position of side of male part 212.Therefore,, in base plate 21, contact part 213 is formed as than leaning on the position of radially inner side in the axial direction away from chain wheel 22 than contact part 213.
Fig. 7 amplifies the left side view that contact part 213, the first retainer 222 and the second retainer 223 are shown.The face of the clockwise direction rear side of contact part 213 is first contact surfaces 217 that contact with the first retainer 222.The face of the clockwise direction front side of the first retainer 222 is the contact surfaces 227 that contact with contact part 213.The first contact surface 217 and contact surface 227 are approximately perpendicular to circumferentially.In other words, the first contact surface 217 is approximately perpendicular to the tangent line of this circumference at the intersection point place of circumference centered by central axis J1 and the first contact surface 217.Also identical at contact surface 227.Contact with the first retainer 222 by contact part 213, can limit the left-hand revolution of base plate 21 with respect to chain wheel 22.In addition, the first contact surface 217 and contact surface 227 needn't be closely perpendicular to circumferentially, also can be with respect to circumferentially tilting a little.
In the time that base plate 21 rotates in a clockwise direction with respect to chain wheel 22, contact part 213, away from the first retainer 222, moves and contacts with the second retainer 223 towards the second retainer 223.Contact part 213 in movement circumferentially separates with the first retainer 222 and the second retainer 223 edges.The face of the clockwise direction front side of contact part 213 is second contact surfaces 218 that contact with the second retainer 223.The face of the clockwise direction rear side of the second retainer 223 is the contact surfaces 228 that contact with contact part 213.The second contact surface 218 and contact surface 228 are approximately perpendicular to circumferentially.In other words, the second contact surface 218 is approximately perpendicular to the tangent line of this circumference at the intersection point place of circumference centered by central axis J1 and the second contact surface 218.Contact surface 228 is also identical.Contact with the second retainer 223 by contact part 213, can suppress the clickwise of base plate 21 with respect to chain wheel 22.In addition, the second contact surface 218 and contact surface 228 needn't be closely perpendicular to circumferentially, also can be with respect to circumferentially tilting a little.
During contact part 213 moves to the second retainer 223 from the first retainer 222, base plate 21 rotates approximately 5.5 ° relatively with respect to chain wheel 22.5.5 ° of the anglecs of rotation are equivalent to test section 26(described later with reference to Figure 16) in 49.5 ° of electric angles.As shown in Figure 2, contact part 213, the first retainer 222 and the second retainer 223 are positioned at the position by radial outside than elastic portion 23.Contact part 213 also can be by forming a part for the peripheral part of base plate 21 substantially along bending vertically on the wiggle circumferentially extending.
As shown in Figure 6, be arranged at first jut 214 of peripheral part of base plate 21 and a part for the second opening 221 of chain wheel 22 at axial overlap.The first jut 214 with the second jut 224 of interior perimembranous that is arranged at chain wheel 22 circumferentially opposed.The first jut 214 is housed inside elastic portion 23(with reference to figure 2) an end be in the end of clockwise direction rear side.The other end that the second jut 224 is housed inside elastic portion 23 is in the end of clockwise direction front side.Thus, elastic portion 23 is configured to the second opening 221 at axial overlap.In base plate 21, it is the position of male part 212 by axial left side that the first jut 214 is positioned at than position around.In chain wheel 22, the second jut 224 is positioned at the position by axial left side than position around.
In the time that base plate 21 is applied to pedal force, base plate 21 is with respect to the relative clickwise of chain wheel 22, and elastic portion 23 is compressed.And contact part 213 separates and close the second retainer 223 from the first retainer 222.After just base plate 21 being applied to pedal force, chain wheel 22 does not rotate, and base plate 21 rotates.In the time that base plate 21 rotates the balanced position of recuperability to pedal force and elastic portion 23, chain wheel 22 starts together to rotate with base plate 21.
In torque sensor 2, become large along with putting on the pedal force of base plate 21, base plate 21 is with respect to the relative clickwise of chain wheel 22, and elastic portion 23 is further compressed.And contact part 213 moves along the direction that tends to the second retainer 223 from the first retainer 222.Be greater than at the pedal force that puts on base plate 21 under the state of pre-sizing, the second contact surface 218(of contact part 213 is with reference to figure 7) along the contact surface 228 that circumferentially presses on the second retainer 223.
Fig. 8 is the right side view of inner side magnet portion 24.Inner side magnet portion 24 is the roughly circular plate-shaped members centered by central axis J1.As shown in Figure 9, the right flank of base plate 21 is fixed in inner side magnet portion 24 by screw etc.In the time that base plate 21 is applied to pedal force, inner side magnet portion 24 together rotates with base plate 21 centered by central axis J1.
Figure 10 is the cutaway view that the A-A position in Fig. 8 cuts off inner side magnet portion 24.As shown in Fig. 8 and Figure 10, inner side magnet portion 24 comprises the first yoke 241, the first magnet accommodation section 242 and multiple the first magnet 243.The first yoke 241 is along the roughly circular plate-shaped member of Directional Extension that is approximately perpendicular to central axis J1 centered by central axis J1.The magnetic substances such as the first yoke 241 is metal.The number of multiple the first magnet 243 is even number.In inner side magnet portion 24,18 the first magnet 243 are for example set.The first magnet 243 is preferably ferrite lattice.As the first magnet 243, also can use other magnet such as neodium magnet.The first yoke 241 and multiple the first magnet 243 and multiple elastic portion 23 are at axial overlap.
The first magnet accommodation section 242 is the roughly circular plate-shaped members centered by central axis J1.The first magnet accommodation section 242 is positioned at the right side of the first yoke 241, and is fixed on the right flank 244 of the first yoke 241.The right flank 244 of the first yoke 241 is expanded in the mode substantially vertical with central axis J1.The first magnet accommodation section 242 is preferably the non-magnetic materials such as resin.The first magnet accommodation section 242 is further preferably formed by resin, and is fixed on the first yoke 241 by insert molding.18 hole portions 245 with the first magnet 243 equal numbers are set in the first magnet accommodation section 242.Each hole portion 245 connects the first magnet accommodation section 242 vertically.The cross section perpendicular to axial direction of hole portion 245 is circular.Multiple hole portion 245 with equal angles interval roughly along circumferentially configuration.The opening in the left side of hole portion 245 is sealed by the right flank 244 of the first yoke 241.
Each the first magnet 243 is extend vertically roughly cylindric.Multiple the first magnet 243 is housed inside respectively in the multiple hole portion 245 of the first magnet accommodation section 242.Preferably multiple the first magnet 243 is pressed into respectively in multiple hole portion 245.Thus, multiple the first magnet 243 configures so that roughly edge, equal angles interval is circumferential on the right flank 244 of the first yoke 241.Each the first magnet 243 directly contacts with the right flank 244 of the first yoke 241.Or each the first magnet 243 contacts with the right flank 244 of the first yoke 241 indirectly by adhesive agent.In other words, the thin adhesive layer directly contacting with the first magnet 243 with the right flank 244 of the first yoke 241 is set.The pole orientation of each the first magnet 243 is contrary along the pole orientation of the first circumferentially adjacent magnet 243 separately with them., nine first magnet 243 of the N utmost point towards nine first magnet 243 on a left side and the S utmost point towards a left side are along circumferential alternative arrangements.
Figure 11 amplifies first magnet 243 and near the right side view of this first magnet 243 are shown.At the inside face 246 of hole portion 245, multiple inside face protuberances 247 are set.Multiple inside face protuberances 247 configure along being circumferentially separated from each other of hole portion 245 centered by the central axis J2 of the first magnet 243.Central axis J2 is parallel with central axis J1.For example, three inside face protuberances 247 with equal angles interval roughly along the circumferential configuration of hole portion 245.Inside face protuberance 247 is outstanding to the radially inner side centered by central axis J2 compared with position around.Inside face protuberance 247 contacts with the outer peripheral face of the first magnet 243.The position except multiple inside face protuberances 247 in the inside face 246 of hole portion 245 separates with the first magnet 243., multiple the first magnet 243 respectively the week along centered by central axis J2 the multiple positions that are separated from each other upwards contact with the inside face 246 of multiple hole portion 245.
Figure 12 is the right side view of outside magnet portion 25.Outside magnet portion 25 is the roughly circular plate-shaped members centered by central axis J1.As shown in figure 13, the right flank of chain wheel 22 is fixed in outside magnet portion 25 by screw etc.Outside magnet portion 25 together rotates with chain wheel 22 centered by central axis J1.Outside magnet portion 25 is positioned at the radial outside of inner side magnet portion 24 as shown in Figure 3.As mentioned above, if base plate 21 rotates relatively with respect to chain wheel 22, inner side magnet portion 24 changes with respect to the circumferential relative position of outside magnet portion 25.
Figure 14 is the cutaway view that the B-B position in Figure 12 cuts off by outside magnet portion 25.As shown in Figure 12 and Figure 14, outside magnet portion 25 comprises the second yoke 251, the second magnet accommodation section 252 and multiple the second magnet 253.The second yoke 251 is along the roughly circular plate-shaped member of Directional Extension that is approximately perpendicular to central axis J1 centered by central axis J1.The magnetic substances such as the second yoke 251 is metal.The number of multiple the second magnet 253 is even number.In outside magnet portion 25, for example, 18 the second magnet 253 with the first magnet 243 equal numbers are set.The second magnet 253 is preferably ferrite lattice.As the second magnet 253, also can use other magnet such as neodium magnet.The second yoke 251 and multiple the second magnet 253 are axially overlapping with multiple elastic portion 23.
The second magnet accommodation section 252 is the roughly circular plate-shaped members centered by central axis J1.The second magnet accommodation section 252 is positioned at the right side of the second yoke 251, and is fixed on the right flank 254 of the second yoke 251.The right flank 254 of the second yoke 251 is expanded in the mode that is approximately perpendicular to central axis J1.The second magnet accommodation section 252 is preferably the non-magnetic materials such as resin.The second magnet accommodation section 252 is further preferably formed by resin, and is fixed on the second yoke 251 by inserting moulding.18 hole portions 255 with the second magnet 253 equal numbers are set in the second magnet accommodation section 252.Each hole portion 255 connects the second magnet accommodation section 252 vertically.The cross section perpendicular to axial direction of hole portion 255 is circular.Multiple hole portion 255 with equal angles interval roughly along circumferentially configuration.The opening in the left side of hole portion 255 is sealed by the right flank 254 of the second yoke 251.
Each the second magnet 253 is extend vertically roughly cylindric.Diameter on the cross section perpendicular to axial direction of the second magnet 253 is larger than the diameter on the cross section perpendicular to axial direction of the first magnet 243.Multiple the second magnet 253 is housed inside respectively in the multiple hole portion 255 of the second magnet accommodation section 252.Preferably multiple the second magnet 253 is pressed into respectively in multiple hole portion 255.Thus, multiple the second magnet 253 configures so that roughly edge, equal angles interval is circumferential on the right flank 254 of the second yoke 251.Multiple the second magnet 253 are disposed at the radial outside of multiple the first magnet 243 as shown in Figure 3.
12 and Figure 14 shown in each the second magnet 253 directly contact with the right flank 254 of the second yoke 251.Or each the second magnet 253 contacts with the right flank 254 of the second yoke 251 indirectly by adhesive agent.In other words, the thin adhesive layer directly contacting with the second magnet 253 with the right flank 254 of the second yoke 251 is set.The pole orientation of each the second magnet 253 is contrary along the pole orientation of the second circumferentially adjacent magnet 253 separately with them., nine second magnet 253 of the N utmost point towards nine second magnet 253 on a left side and the S utmost point towards a left side are along circumferential alternative arrangements.
Figure 15 amplifies second magnet 253 and near the right side view of this second magnet 253 are shown.At the inside face 256 of hole portion 255, multiple inside face protuberances 257 are set.Multiple inside face protuberances 257 configure along being circumferentially separated from each other of hole portion 255 centered by the central axis J3 of the second magnet 253.Central axis J3 is parallel with central axis J1.For example, three inside face protuberances 257 with equal angles interval roughly along the circumferential configuration of hole portion 255.Inside face protuberance 257 is outstanding to the radially inner side centered by central axis J3 compared with position around.Inside face protuberance 257 contacts with the outer peripheral face of the second magnet 253.The position except multiple inside face protuberances 257 in the inside face 256 of hole portion 255 separates with the second magnet 253., multiple the second magnet 253 respectively the week along centered by central axis J3 the multiple positions that are separated from each other upwards contact with the inside face 256 of multiple hole portion 255.
Figure 16 is the right side view of inner side magnet portion 24 and outside magnet portion 25.In Figure 16, together draw test section 26 with inner side magnet portion 24 and outside magnet portion 25.And, under the state shown in Figure 16, about being centered close on the straight line radially extending of radially opposed the first magnet 243 and the second magnet 253, the first magnet 243 centers and the second magnet 253.In this case, two tangent lines that extend towards the first magnet 243 from central axis J1 of the first magnet 243 are with radially tangent with opposed the second magnet 253 of the first magnet 243.
Figure 17 is the cutaway view that the C-C position in Figure 16 cuts off by inner side magnet portion 24, outside magnet portion 25 and test section 26.As shown in FIG. 16 and 17, the first detecting element 261 and inner side magnet portion 24 to be configured in discretely than inner side magnet portion 24 be the position on right side by the front side in Figure 16 in the axial direction.Identical with the first detecting element 261, the second detecting element 262 is also configured in the position on the right side in the axial direction than inner side magnet portion 24 discretely with inner side magnet portion 24.The second detecting element 262 is upwards being disposed at the position of departing from approximately 10 ° from the first detecting element 261 week.10 ° of angles between the first detecting element 261 and the second detecting element 262 are equivalent to 90 ° of electric angles in test section 26.
The 3rd detecting element 263 and outside magnet portion 25 are configured in the position on the right side in the axial direction than outside magnet portion 25 discretely.Identical with the 3rd detecting element 263, the 4th detecting element 264 is also configured in the position on the right side in the axial direction than outside magnet portion 25 discretely with outside magnet portion 25.The 4th detecting element 264 is upwards being disposed at the position of departing from approximately 10 ° from the 3rd detecting element 263 week.10 ° of angles between the 3rd detecting element 263 and the 4th detecting element 264 are equivalent to 90 ° of electric angles in test section 26.
The first detecting element 261 and the second detecting element 262 with inner side magnet portion 24 axially opposed.The 3rd detecting element 263 and the 4th detecting element 264 with outside magnet portion 25 axially opposed.The first detecting element 261 and the 3rd detecting element 263 are at diametrically contraposition.The second detecting element 262 and the 4th detecting element 264 are at diametrically contraposition.Detecting element 261～264 is for example fixed on the graphic sheath portion of omission that covers the inner side right flank of magnet portion 24 and the right flank of outside magnet portion 25.Even if this sheath portion is not also rotated in the situation that base plate 21 and chain wheel 22 rotate.
The first detecting element 261 and the second detecting element 262 are the inner side test section 265 that detects the intensity in the magnetic field being formed by inner side magnet portion 24.The 3rd detecting element 263 and the 4th detecting element 264 are the outside test section 266 that detects the intensity in the magnetic field being formed by outside magnet portion 25.If inner side magnet portion 24 rotates centered by central axis J1, detect the intensity in the magnetic field being produced by inner side magnet portion 24 by inner side test section 265, and with roughly sinuous signal output.If outside magnet portion 25 rotates centered by central axis J1, detect the intensity in the magnetic field being produced by outside magnet portion 25 by outside test section 266, and with roughly sinuous signal output.As shown in figure 17, the axial distance L2 between outside test section 266 and multiple the second magnet 253 is greater than the axial distance L1 between inner side test section 265 and multiple the first magnet 243.
In inner side magnet portion 24, identical the first magnet 243 of pole orientation with 40 ° of intervals along circumferential array.If inner side magnet portion 24 rotates 40 °, export the roughly signal of a sinuous wavelength amount by inner side test section 265.Also identical with inner side magnet portion 24 in outside magnet portion 25, identical the second magnet 253 of pole orientation with 40 ° of intervals along circumferential array.If outside magnet portion 25 rotates 40 °, export the roughly signal of a sinuous wavelength amount by outside test section 266.In other words, 40 ° of anglecs of rotation of inner side magnet portion 24 and outside magnet portion 25 are equivalent to 360 ° of electric angles.
In the test section 26 shown in Figure 16, the signal of relatively being exported by inner side test section 265 and the signal of being exported by outside test section 266, and obtain the circumferential relative position of inner side magnet portion 24 with respect to outside magnet portion 25 according to comparative result.This relative position is sent to the control part 43 shown in Fig. 1 from test section 26.Control part 43 is obtained pedal force according to this relative position.Control part 43 is exported control signal according to this pedal force to motor 41, controls and provides to the size of the auxiliary power of front-wheel 12 from motor 41.
In test section 26, because inner side test section 265 comprises the first detecting element 261 and the second detecting element 262, even under the state therefore not rotating in inner side magnet portion 24, also can accurately obtain the circumferential relative position of inner side magnet portion 24 with respect to inner side test section 265.Because outside test section 266 comprises the 3rd detecting element 263 and the 4th detecting element 264, even under the state therefore not rotating in outside magnet portion 25, also can accurately obtain the circumferential relative position of outside magnet portion 25 with respect to outside test section 266.For example, obtain the first detecting element 261 and the circumferential distance between the first magnet 243 of the position of the most close the first detecting element 261 by inner side test section 265.And, obtain the 3rd detecting element 263 and the circumferential distance between the second magnet 253 of the position of the most close the 3rd detecting element 263 by outside test section 266.
In electrically assisted bicycle 1, after just to pedal 32 application of forces, chain wheel 22 and outside magnet portion 25 do not rotate, and base plate 21 and inner side magnet portion 24 rotate.As mentioned above, even under the state not rotating in inner side magnet portion 24 and outside magnet portion 25, test section 26 also can accurately be obtained the circumferential relative position of inner side magnet portion 24 with respect to outside magnet portion 25.Therefore,, even after just to pedal 32 application of forces, test section 26 also can accurately be obtained the circumferential relative position of inner side magnet portion 24 with respect to outside magnet portion 25.
Above, electrically assisted bicycle 1 is illustrated.As mentioned above, in torque sensor 2, inner side magnet portion 24 comprises the first yoke 241 and multiple the first magnet 243 direct or that indirectly contact with the first yoke 241 by adhesive agent.And outside magnet portion 25 comprises the second yoke 251 and multiple the second magnet 253 direct or that indirectly contact with the second yoke 251 by adhesive agent.
The magnetic flux density in the magnetic flux density in the magnetic field being produced by inner side magnet portion 24 thus, and the magnetic field that produced by outside magnet portion 25 increases.Therefore, can detect accurately the circumferential relative position of inner side magnet portion 24 with respect to outside magnet portion 25 by test section 26.Consequently, can obtain accurately the torque that puts on base plate 21 by pedal force, and the auxiliary power providing from motor 41 can be provided accurately.
And, and between the first magnet 243 and the first yoke 241, arrange than compared with the situation of resin component of adhesive agent bed thickness etc., can improve the first magnet 243 positional precision in the axial direction.Equally, can also improve the second magnet 253 positional precision in the axial direction.Thus, can detect more accurately the circumferential relative position of inner side magnet portion 24 with respect to outside magnet portion 25.In addition, because the unit permeance of the first magnet 243 and the second magnet 253 increases by the first yoke 241 and the second yoke 251, therefore can suppress the low temperature demagnetization of the first magnet 243 and the second magnet 253.
In torque sensor 2, even in the case of using the smaller ferrite lattice of magnetic force as the first magnet 243 and the second magnet 253, also can detect accurately as described above the circumferential relative position of inner side magnet portion 24 with respect to outside magnet portion 25.By using ferrite lattice as the first magnet 243 and the second magnet 253, can reduce the manufacturing cost of torque sensor 2.
As mentioned above, multiple the first magnet 243 is housed inside respectively in the multiple hole portion 245 of the first magnet accommodation section 242 of being fixed on the first yoke 241.Multiple the second magnet 253 is housed inside respectively in the multiple hole portion 255 of the second magnet accommodation section 252 of being fixed on the second yoke 251.Thus, can improve the precision of the installation site of the first magnet 243 and the second magnet 253.Consequently, can detect more accurately the circumferential relative position of inner side magnet portion 24 with respect to outside magnet portion 25.
And the first magnet 243 is pressed in the hole portion 245 of the first magnet accommodation section 242, the second magnet 253 is pressed in the hole portion 255 of the second magnet accommodation section 252.Thus, can further improve the precision of the installation site of the first magnet 243 and the second magnet 253.
The first magnet 243 contacts with the inside face 246 of hole portion 245 in the multiple positions that are separated from each other.Thus, the first magnet 243 easily can be pressed in hole portion 245.And, in the time being pressed into the first magnet 243, can suppress the position breakage of the surrounding of hole portion 245.In order to improve the positional precision of the first magnet 243 in hole portion 245, the first magnet 243 preferably contacts with the inside face 246 of hole portion 245 in more than three position being separated from each other.
The second magnet 253 is identical with the first magnet 243, contacts with the inside face 256 of hole portion 255 in the multiple positions that are separated from each other.Thus, the second magnet 253 easily can be pressed in hole portion 255.And, in the time being pressed into the second magnet 253, can suppress the position breakage of the surrounding of hole portion 255.In order to improve the positional precision of the second magnet 253 in hole portion 255, the second magnet 253 preferably contacts with the inside face 256 of hole portion 255 in more than three position being separated from each other.
As mentioned above, because the diameter of the second magnet 253 is greater than the diameter of the first magnet 243, the magnetic field therefore being formed by outside magnet portion 25 is stronger than the magnetic field being formed by inner side magnet portion 24.In torque sensor 2, the axial distance L2 between outside test section 266 and multiple the second magnet 253 is larger than the axial distance L1 between inner side test section 265 and multiple the first magnet 243.Thus, can reduce peak value poor in the peak value in the magnetic field of being detected by outside test section 266 and the magnetic field detected by inner side test section 265.Consequently, can easily detect the circumferential relative position of inner side magnet portion 24 with respect to outside magnet portion 25 by test section 26.The peak value in the magnetic field of preferably being detected by outside test section 266 is roughly equal with the peak value in the magnetic field of being detected by inner side test section 265.
In torque sensor 2, multiple elastic portion 23 and the first yoke 241 and the second yoke 251 are at axial overlap.Thus, and be configured to elastic portion 23 and the first yoke 241 and the second yoke 251 compared with the radially overlapping situation, can make torque sensor 2 in radially miniaturization.And, can suppress torque sensor 2 in maximization radially, can strengthen again the radial width of the first yoke 241 and the radial width of the second yoke 251.
In base plate 21, the first contact surface 217 of the contact part 213 contacting with the first retainer 222 is approximately perpendicular to circumferentially.In chain wheel 22, the contact surface 227 of the first retainer 222 contacting with contact part 213 is approximately perpendicular to circumferentially.Therefore,, even if contact part 213 presses on the first retainer 222 repeatedly, also can suppress the first contact surface 217 and contact surface 227 and cut down or be out of shape.Thus, can be suppressed at the circumferential relative position skew with respect to chain wheel 22 of state lower shoe 21 that contact part 213 contacts with the first retainer 222.Consequently, inside detecting, in the process of magnet portion 24 with respect to the relative position of outside magnet portion 25, can suppress accuracy of detection declines.
The first retainer 222 is by forming a part for the interior perimembranous of chain wheel 22 substantially along bending vertically on the wiggle circumferentially extending., the wiggle of the first retainer 222 is substantially vertical with the contact surface 227 of the first retainer 222.Thus, even if contact part 213 presses on the first retainer 222 repeatedly, also can suppress the first retainer 222 along circumferential deformation.Consequently, inside detecting, in the process of magnet portion 24 with respect to the relative position of outside magnet portion 25, can suppress accuracy of detection declines.
In base plate 21, second contact surface 218 contacting with the second retainer 223 of contact part 213 is approximately perpendicular to circumferentially.In chain wheel 22, the contact surface 228 contacting with contact part 213 of the second retainer 223 is approximately perpendicular to circumferentially.Therefore,, even if contact part 213 presses on the second retainer 223 repeatedly, also can suppress the second contact surface 218 and contact surface 228 and be worn or be out of shape.Thus, can be suppressed at the circumferential relative position skew with respect to chain wheel 22 of state lower shoe 21 that contact part 213 contacts with the second retainer 223.Consequently, inside detecting, in the process of magnet portion 24 with respect to the relative position of outside magnet portion 25, can suppress accuracy of detection declines.
The second retainer 223 is by forming a part for the interior perimembranous of chain wheel 22 substantially along bending vertically on the wiggle circumferentially extending., the wiggle of the second retainer 223 is substantially vertical with the contact surface 228 of the second retainer 223.Thus, even if contact part 213 presses on the second retainer 223 repeatedly, also can suppress the second retainer 223 along circumferential deformation.Consequently, inside detecting, in the process of magnet portion 24 with respect to the relative position of outside magnet portion 25, can suppress accuracy of detection declines.
As mentioned above, contact part 213 also can be by forming a part for the peripheral part of base plate 21 substantially along bending vertically on the wiggle circumferentially extending.In this case, the wiggle of contact part 213 is substantially vertical with the first contact surface 217 and the second contact surface 218.Thus, even if contact part 213 presses on the first retainer 222 and the second retainer 223 repeatedly, also can suppress contact part 213 along circumferential deformation.Consequently, inside detecting, in the process of magnet portion 24 with respect to the relative position of outside magnet portion 25, can suppress accuracy of detection declines.
In electrically assisted bicycle 1, under not to the state of pedal 32 application of forces, contact part 213 presses on the first retainer 222, and becomes while being greater than pre-sizing at pedal force, and contact part 213 presses on the second retainer 223., contact part 213 presses on the second retainer 223 with larger strength.In torque sensor 2, the circumferential lengths of the second retainer 223 is larger than the circumferential lengths of the first retainer 222.Thus, compare with the circumferential lengths of the second retainer 223 all shorter situations the same as the first retainer 222, can suppress the distortion of the second retainer 223.
As mentioned above, contact part 213 and the first retainer 222 are positioned at the position by radial outside than elastic portion 23.Thus, by contact part 213 and the first retainer 222 being arranged to the position of distant decentering axis J1, can improve the first retainer 222 in week positional precision upwards.Thus, can improve the positional precision of the contact part 213 of the state contacting with the first retainer 222.Consequently, can detect more accurately the circumferential relative position of inner side magnet portion 24 with respect to outside magnet portion 25.And, can obtain accurately the stress that puts on contact part 213 and the first retainer 222.
The second retainer 223 is also positioned at the position by radial outside than elastic portion 23.Thus, the second retainer 223 can be improved in week positional precision upwards, and the positional precision of the contact part 213 of the state contacting with the second retainer 223 can be improved.Consequently, can detect more accurately the circumferential relative position of inner side magnet portion 24 with respect to outside magnet portion 25.And, can obtain accurately the stress that puts on contact part 213 and the second retainer 223.
At the central portion of base plate 21, the left side connecting crank 31 by riveted joint from base plate 21.Stress during by connecting crank 31, the peripheral part of base plate 21 is likely crooked and near chain wheel 22 to the right.In base plate 21, contact part 213 is positioned at than the position of radially inner side in the axial direction away from the direction of chain wheel 22 as described above.Thus, even if the peripheral part of base plate 21 is crooked to the right, also can prevent that contact part 213 from contacting with chain wheel 22.
The first jut 214 of base plate 21 and the second jut 224 of chain wheel 22 are circumferentially opposed.The edge 225 of the radial outside of the second jut 224 is substantially along circumferentially extending.Thus, elastic portion 23 is easily towards the direction along edge 225 is flexible substantially.And the edge 215 of the radial outside of the first jut 214 is along with tend to radially inner side near the second jut 224.Thus, in the time that elastic portion 23 is flexible, can reduce the friction between the edge 215 of the first jut 214 and the inside face of elastic portion 23.In addition, in the time that elastic portion 23 is compressed, the end that can suppress the first jut 214 hangs on the step of inner side of elastic portion 23.
In torque sensor 2, also can make the edge 215 of the radial outside of the first jut 214 extend along circumferential substantially, and make the edge 225 of the radial outside of the second jut 224 tend to radially inner side along with close the first jut 214.; in the jut of a side in the first jut 214 and the second jut 224; the edge of radial outside is substantially along circumferentially extending; in the jut of the opposing party in the first jut 214 and the second jut 224, the edge of radial outside tends to radially inner side along with the jut near a side.Thus, in the time that elastic portion 23 is flexible, can reduce the friction between the edge of radial outside and the inside face of elastic portion 23 of a side jut.In addition, in the time that elastic portion 23 is compressed, can suppress the wherein end of a side jut and hang on the step of inner side of elastic portion 23.
The edge 226 of the radially inner side of the second jut 224 is along with tend to radial outside near the first jut 214.Thus, make elastic portion 23 from radial outside near the second jut 224, thereby can make the second jut 224 easily be inserted into the end of elastic portion 23.Consequently, can make elastic portion 23 easily be installed to base plate 21 and chain wheel 22.
In torque sensor 2, also can make the edge 216 of the radially inner side of the first jut 214 tend to radial outside along with close the second jut 224.,, in the jut of the side in the first jut 214 and the second jut 224, the edge of radially inner side tends to radial outside along with the jut near the opposing party.Thus, make elastic portion 23 from radial outside the jut near a side, thereby can easily this side's jut be inserted into the end of elastic portion 23.Consequently, can make elastic portion 23 easily be installed to base plate 21 and chain wheel 22.
And, also in a side's that can be in the first jut 214 and the second jut 224 jut, make the edge of radially inner side tend to radial outside along with the jut near the opposing party, and make the rim of the radial outside of the opposing party's jut tend to radially inner side along with the jut near a side.
Above, embodiment of the present utility model is illustrated, but the utility model is not limited to above-mentioned embodiment and can carries out various changes.
The number of the first magnet 243 is even number, is not limited to 18.The number of the second magnet 253 is also even number, is not limited to 18.The shape of the first magnet 243 and the second magnet 253 needn't be roughly cylindric, can be also various shapes.
In the first magnet accommodation section 242, also can carry out various changes with the cross sectional shape of axial vertical hole portion 245.For example, this cross sectional shape also can be general triangular, contacts with the first magnet 243 at three inside faces corresponding with leg-of-mutton three limits.The hole portion 255 of the second magnet accommodation section 252 is also identical.
The first magnet 243 needn't necessarily be pressed in hole portion 245, also can be received in hole portion 245 by other the whole bag of tricks.The second magnet 253 is also identical, can be inserted in hole portion 255 by the whole bag of tricks except being pressed into.As long as the first magnet 243 positions accurately can be fixed on the first yoke 241, also can omit the first magnet accommodation section 242.And, as long as the second magnet 253 positions accurately can be fixed on the second yoke 251, also can omit the second magnet accommodation section 252.
The first yoke 241 for example also can be by forming roughly circular-arc multiple yoke parts with circular arrangement roughly.Now, the circumferential end of each yoke parts and the first magnet 243 are overlapping.Also identical in the second yoke 251.But from the viewpoint of the ease of manufacture of torque sensor 2, the first yoke 241 and the second yoke 251 are preferably roughly circular parts.
Elastic portion 23 also can be connected with base plate 21 and chain wheel 22 under extended state.In this case, contact part 213 is pressed against the first retainer 222 by the recuperability of elastic portion 23, if base plate 21 is applied to pedal force, base plate 21 rotates relatively with respect to chain wheel 22, and elastic portion 23 is further stretched.Elastic portion 23, as long as there is elastic deformation by base plate 21 with respect to the relative rotation of chain wheel 22, is not limited to coil spring.Also can use other elastomeric elements such as leaf spring as elastic portion 23.The number of elastic portion 23 also can suitably change.Elastic portion 23 for example also can be one.
The detecting element 261～264 of test section 26 is not limited to Hall element, also can be other various elements.And, a detecting element also can be set respectively as inner side test section 265 and outside test section 266.
The structure of above-mentioned embodiment and each variation needs only mutually not contradiction and just can carry out appropriately combined.
The torque sensor utilization that the utility model can be used as electrically assisted bicycle.
Nomenclature
1-electrically assisted bicycle; 2-torque sensor; 11-vehicle frame; 12-front-wheel; 13-trailing wheel; 16-chain; 21-base plate; 22-chain wheel; 23-elastic portion; Magnet portion inside 24-; Magnet portion outside 25-; 26-test section; 31-crank; 40-driver element; 41-electro-motor; 43-control part; 213-contact part; 214-the first jut; The radial outside of 215-(the first jut) edge; The radially inner side of 216-(the first jut) edge; 217-the first contact surface; 222-the first retainer; 223-the second retainer; 224-the second jut; The radial outside of 225-(the second jut) edge; The radially inner side of 226-(the second jut) edge; 227-(the first retainer) contact surface; 229-tooth; 241-the first yoke; 242-the first magnet accommodation section; 243-the first magnet; 244-(the first yoke) right flank; 245-(the first magnet accommodation section) hole portion; 246-(hole portion) inside face; 251-the second yoke; 252-the second magnet accommodation section; 253-the second magnet; 254-(the second yoke) right flank; 255-(the second magnet accommodation section) hole portion; 256-(hole portion) inside face; Test section inside 265-; Test section outside 266-; J1-central axis.
Claims (15)
1. the torque sensor that electrically assisted bicycle is used, has:
Base plate is connected with crank on the central axis of this base plate;
Chain wheel, it is circular centered by described central axis, and has the multiple teeth that engage with chain at peripheral part;
Rotation guide portion, it guides described base plate that it can be rotated relatively with respect to described chain wheel;
Elastic portion, its by described base plate with respect to the relative rotation of described chain wheel and elastic deformation;
Inner side magnet portion, it is circular centered by described central axis, and is fixed on described base plate;
Outside magnet portion, it is circular centered by described central axis, and is positioned at the radial outside of described inner side magnet portion, and is fixed on described chain wheel; And
Test section, it detects the circumferential relative position of described inner side magnet portion with respect to described outside magnet portion,
The torque sensor that this electrically assisted bicycle is used is characterised in that,
Described inner side magnet portion has:
The first circular yoke, it is the edge Directional Extension vertical with described central axis centered by described central axis; And
Multiple the first magnet, described multiple the first magnet edges are circumferentially configured on the side vertical with described central axis of described the first yoke, and directly or by adhesive agent indirectly contact with described the first yoke,
Described outside magnet portion has:
The second circular yoke, it is the edge Directional Extension vertical with described central axis centered by described central axis; And
Multiple the second magnet, described multiple the second magnet is circumferentially configured on the side vertical with described central axis of described the second yoke on the radial outside edge of described multiple the first magnet, and directly or by adhesive agent indirectly contacts with described the second yoke,
The number of described multiple the first magnet is even number, and the pole orientation of each the first magnet is contrary along the pole orientation of the first circumferentially adjacent magnet separately with them,
The number of described multiple the second magnet is even number, and the pole orientation of each the second magnet is contrary along the pole orientation of the second circumferentially adjacent magnet separately with them.
2. the torque sensor that electrically assisted bicycle according to claim 1 is used, is characterized in that,
Described inner side magnet portion also has the first magnet accommodation section on the described side of being fixed on described the first yoke,
Described multiple the first magnet is contained in respectively in the multiple hole portion that is arranged at described the first magnet accommodation section,
Described outside magnet portion also has the second magnet accommodation section on the described side of being fixed on described the second yoke,
Described multiple the second magnet is contained in respectively in the multiple hole portion that is arranged at described the second magnet accommodation section.
3. the torque sensor that electrically assisted bicycle according to claim 2 is used, is characterized in that,
Described multiple the first magnet is pressed into respectively in the described multiple hole portion of described the first magnet accommodation section,
Described multiple the second magnet is pressed into respectively in the described multiple hole portion of described the second magnet accommodation section.
4. the torque sensor that electrically assisted bicycle according to claim 3 is used, is characterized in that,
Described multiple the first magnet contacts at the inside face of the described multiple hole of the multiple positions that are circumferentially separated from each other along hole portion and described the first magnet accommodation section portion respectively,
Described multiple the second magnet contacts at the inside face of the described multiple hole of the multiple positions that are circumferentially separated from each other along hole portion and described the second magnet accommodation section portion respectively.
5. the torque sensor that electrically assisted bicycle according to claim 1 is used, is characterized in that,
Described elastic portion is axially overlapping with described the first yoke and described the second yoke.
6. the torque sensor that electrically assisted bicycle according to claim 1 is used, is characterized in that,
Be positioned at the contact part by the position of radial outside than described elastic portion in described base plate setting,
At described chain wheel, the first retainer is set, described the first retainer be positioned at than described elastic portion by the position of radial outside and with described contact part circumferentially opposed,
Described elastic portion is compressive state,
Described base plate is not being applied under the state of pedal force, described contact part presses on described the first retainer by the recuperability of described elastic portion,
The contact surface contacting with described the first retainer of described contact part and the contact surface contacting with described contact part of described the first retainer are perpendicular to circumferentially.
7. the torque sensor that electrically assisted bicycle according to claim 6 is used, is characterized in that,
Described contact part is by forming bending vertically on the vertical wiggle of the described contact surface with respect to contacting with described the first retainer a part for described base plate, or described the first retainer is by forming a part for described chain wheel bending vertically on the vertical wiggle of the described contact surface with respect to contact with described contact part.
8. the torque sensor that electrically assisted bicycle according to claim 6 is used, is characterized in that,
The second retainer is also set on described chain wheel, described the second retainer be positioned at than described elastic portion by the position of radial outside and with described the first retainer along circumferentially separating, and described the second retainer and described contact part be circumferentially opposed,
Described contact site between described the first retainer and described the second retainer,
Become large along with putting on the pedal force of described base plate, described elastic portion is compressed, and described contact part moves along the direction that tends to described the second retainer from described the first retainer,
Be greater than at the pedal force that puts on described base plate under the state of prescribed level, described contact part is pressed against described the second retainer,
The circumferential lengths of described the second retainer is greater than the circumferential lengths of described the first retainer.
9. the torque sensor that electrically assisted bicycle according to claim 6 is used, is characterized in that,
In described base plate, described contact part be formed as than than this contact part by the position of radially inner side axially away from described chain wheel.
10. the torque sensor that electrically assisted bicycle according to claim 1 is used, is characterized in that,
Described elastic portion is the coil spring of linearly extension,
At described base plate, the first jut is set, described the first jut is given prominence to and is housed inside in a side the end of described elastic portion along circumferential,
At described chain wheel, the second jut is set, described the second jut and described the first jut be circumferentially opposed and along circumferentially outstanding, and described the second jut is housed inside in the opposing party's the end of described elastic portion,
The edge of the radial outside of the jut of the side in described the first jut and described the second jut extends along circumferential,
The edge of the radial outside of the jut of the opposing party in described the first jut and described the second jut tends to radially inner side along with the jut near one.
The torque sensor that 11. electrically assisted bicycles according to claim 1 are used, is characterized in that,
Described elastic portion is the coil spring of linearly extension,
At described base plate, the first jut is set, described the first jut is given prominence to and is housed inside in a side the end of described elastic portion along circumferential,
At described chain wheel, the second jut is set, described the second jut and described the first jut be circumferentially opposed and along circumferentially outstanding, and described the second jut is accommodated in the opposing party's the end of described elastic portion,
The edge of the radially inner side of the jut of the side in described the first jut and described the second jut tends to radial outside along with the jut near the opposing party.
The torque sensor that 12. electrically assisted bicycles according to claim 1 are used, is characterized in that,
Described elastic portion is the coil spring of linearly extension,
At described base plate, the first jut is set, described the first jut is given prominence to and is accommodated in a side the end of described elastic portion along circumferential,
At described chain wheel, the second jut is set, described the second jut and described the first jut be circumferentially opposed and along circumferentially outstanding, and described the second jut is accommodated in the opposing party's the end of described elastic portion,
The edge of the radially inner side of the jut of the side in described the first jut and described the second jut tends to radial outside along with the jut near the opposing party,
The edge of the radial outside of described the opposing party's jut tends to radially inner side along with the jut near one.
13. torque sensors of using according to the electrically assisted bicycle described in any one in claim 1 to 12, is characterized in that,
Described test section has the inner side test section of the described inner side of detection magnet portion and the outside test section of the described outside of detection magnet portion,
Axial distance between described the first magnet and described inner side test section is less than the axial distance between described the second magnet and described outside test section.
14. 1 kinds of driver elements that electrically assisted bicycle is used, is characterized in that having:
Torque sensor described in any one in claim 1 to 13;
Electro-motor; And
Control part, it is according to from the signal of described torque sensor output, described electro-motor being exported to control signal.
15. 1 kinds of electrically assisted bicycles, is characterized in that having:
Front-wheel;
Trailing wheel;
Vehicle frame, it connects described front-wheel and described trailing wheel;
Battery; And
Driver element described in claim 14,
In this electrically assisted bicycle, provide auxiliary power from the described electro-motor of described driver element at least one party described front-wheel and described trailing wheel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-242906 | 2012-11-02 | ||
| JP2012242906A JP2014092446A (en) | 2012-11-02 | 2012-11-02 | Torque sensor, drive unit and electric power-assisted bicycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203612162U true CN203612162U (en) | 2014-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310522367.5A Pending CN103803005A (en) | 2012-11-02 | 2013-10-29 | Torque sensor, driving unit and electric assisted bicycle |
| CN201320676225.XU Expired - Fee Related CN203612162U (en) | 2012-11-02 | 2013-10-29 | Torque sensor, drive unit and electric assisted bicycle |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310522367.5A Pending CN103803005A (en) | 2012-11-02 | 2013-10-29 | Torque sensor, driving unit and electric assisted bicycle |
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| CN105599857A (en) * | 2014-11-14 | 2016-05-25 | 麦克森发电机股份公司 | Sensor assembly for controlling an auxiliary motor and wheel hub unit having such a sensor assembly |
| CN106574876A (en) * | 2014-06-18 | 2017-04-19 | 新时代技研株式会社 | Sensor for electric assist mobile body, electric assist unit, electric assist mobile body, and torque detection method |
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| WO2016023220A1 (en) * | 2014-08-15 | 2016-02-18 | Cheevc Ltd | Power vector sensor device and bicycle having the same |
| US10625818B2 (en) | 2015-09-17 | 2020-04-21 | Nidec Corporation | Power assist device, and vehicle equipped with said power assist device |
| CN107031784A (en) * | 2017-05-04 | 2017-08-11 | 深圳哥智行科技有限公司 | The chain wheel formula moment sensor of bicycle |
| DE102017121706A1 (en) * | 2017-09-19 | 2019-03-21 | Iwis Antriebssysteme Gmbh & Co. Kg | Device and method for determining the state of wear of a chain |
| CN107917772B (en) * | 2017-12-29 | 2023-11-24 | 深圳市奥酷曼智能技术有限公司 | Point contact torque sensor and electric power-assisted vehicle |
| CN113306665B (en) * | 2021-06-08 | 2023-04-14 | 范文睿 | Magnetic power-assisted rotating shaft driver |
-
2012
- 2012-11-02 JP JP2012242906A patent/JP2014092446A/en active Pending
-
2013
- 2013-10-29 CN CN201310522367.5A patent/CN103803005A/en active Pending
- 2013-10-29 CN CN201320676225.XU patent/CN203612162U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106574876A (en) * | 2014-06-18 | 2017-04-19 | 新时代技研株式会社 | Sensor for electric assist mobile body, electric assist unit, electric assist mobile body, and torque detection method |
| CN105599857A (en) * | 2014-11-14 | 2016-05-25 | 麦克森发电机股份公司 | Sensor assembly for controlling an auxiliary motor and wheel hub unit having such a sensor assembly |
| CN105599857B (en) * | 2014-11-14 | 2018-06-19 | 麦克森发电机股份公司 | For controlling the sensor device of servo-motor and there is the hub unit of this sensor device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2014092446A (en) | 2014-05-19 |
| CN103803005A (en) | 2014-05-21 |
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