WO2013042319A1 - Human-powered drive force detection apparatus for electric bicycle - Google Patents

Human-powered drive force detection apparatus for electric bicycle Download PDF

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Publication number
WO2013042319A1
WO2013042319A1 PCT/JP2012/005417 JP2012005417W WO2013042319A1 WO 2013042319 A1 WO2013042319 A1 WO 2013042319A1 JP 2012005417 W JP2012005417 W JP 2012005417W WO 2013042319 A1 WO2013042319 A1 WO 2013042319A1
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WO
WIPO (PCT)
Prior art keywords
driving force
human
support member
sensor support
electric bicycle
Prior art date
Application number
PCT/JP2012/005417
Other languages
French (fr)
Japanese (ja)
Inventor
高見　博之
長谷川　昭典
帯田　直樹
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2013042319A1 publication Critical patent/WO2013042319A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
    • B62M6/40—Rider propelled cycles with auxiliary electric motor
    • B62M6/45—Control or actuating devices therefor
    • B62M6/50—Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
    • B62J45/40—Sensor arrangements; Mounting thereof
    • B62J45/41—Sensor arrangements; Mounting thereof characterised by the type of sensor
    • B62J45/411—Torque sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
    • B62J45/40—Sensor arrangements; Mounting thereof
    • B62J45/42—Sensor arrangements; Mounting thereof characterised by mounting
    • B62J45/421—Sensor arrangements; Mounting thereof characterised by mounting at the pedal crank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
    • B62M6/40—Rider propelled cycles with auxiliary electric motor
    • B62M6/60—Rider propelled cycles with auxiliary electric motor power-driven at axle parts
    • B62M6/65—Rider propelled cycles with auxiliary electric motor power-driven at axle parts with axle and driving shaft arranged coaxially

Definitions

  • the present invention relates to a human power driving force detection device for an electric bicycle.
  • a power storage device such as a battery; and an electric motor powered by the power storage device, wherein a human power driving force such as a pedaling force applied to a pedal is detected by a human power driving force detection device including a torque sensor, and the human power driving force
  • a human power driving force detection device including a torque sensor
  • an electric bicycle also referred to as an electric assist bicycle
  • an electric bicycle that can easily travel even on an uphill by applying an auxiliary driving force (assist force) of an electric motor corresponding to the human driving force.
  • the outer peripheral surface of the crankshaft and the cylindrical shaft to which the manpower driving force from the crankshaft is transmitted are used.
  • a magnetostrictive torque sensor in which a magnetostrictive detection layer having magnetic anisotropy is formed on the outer peripheral surface, and a coil is disposed around the outer periphery of the magnetostrictive detection layer.
  • This magnetostrictive torque sensor detects a twisted state of a crankshaft and a twisted state of a cylindrical shaft to which a manual driving force from the crankshaft is transmitted (Patent Document 1, etc.).
  • the crankshaft and the cylindrical shaft (referred to as a manpower transmission rotary shaft) are rotatably supported by bearings or the like.
  • this magnetostrictive torque sensor requires processing of a magnetostriction generating portion and a coil, which requires a lot of manufacturing costs and difficult process management, and has a lot of trouble and time.
  • a driving sprocket also called front sprocket, front gear, or crank sprocket
  • a manpower transmission rotating shaft such as a crankshaft
  • a slave attached to the rear wheel.
  • a driving force transmission body such as a chain is stretched over a driven sprocket as a moving wheel body and the driving sprocket.
  • the manpower driving force is transmitted from the driving sprocket to the driven wheel body via the driving force transmitting body, and the rear wheel is rotated to travel. Therefore, even in an electric bicycle, like a general bicycle, a force that pulls a driving force transmitting body such as a chain forward is generated by the driving sprocket during traveling, and the crankshaft is elastically deformed backward by this reaction force.
  • the torque detection device for an electric bicycle disclosed in Patent Document 2 applies the above structure of the bicycle.
  • a thin plate-like elastic deformation portion (support plate portion) 102 that receives and supports a force from which the crankshaft 101 is elastically deformed rearward from the crankshaft 101.
  • a strain detection sensor (strain gauge) 103 for detecting the amount of elastic deformation is attached to the elastic deformation portion 102.
  • the elastic deformation portion 102 and the strain detection sensor 103 are formed with a box-shaped holding frame portion 105 around a hanger portion 104 (also referred to as a bottom bracket).
  • the elastic deformation part 102 is supported.
  • the elastic deformation portion 102 is supported with the hanger portion 104 having a special shape.
  • the structure itself is simple, but the holding frame part 105 is formed around the hanger part 104, or the hanger part 104 is formed in a special shape. Therefore, there is a difficulty that it is difficult to apply to a general bicycle.
  • Patent Document 3 discloses, as shown in FIGS. 16 to 19, an adapter member 151 having a shape that spreads from the end of the hanger portion 150 to the outer periphery, and the adapter member 151.
  • a main body (sensor main body) 152 to be fitted inside the large-diameter portion 151a, and strain gauges 153, 154, 155, 156 are attached to a part of the sensor main body 152. It is disclosed.
  • FIGS. 16 to 19 an adapter member 151 having a shape that spreads from the end of the hanger portion 150 to the outer periphery, and the adapter member 151.
  • a main body (sensor main body) 152 to be fitted inside the large-diameter portion 151a, and strain gauges 153, 154, 155, 156 are attached to a part of the sensor main body 152. It is disclosed.
  • FIGS. 16 to 19 an adapter member 151 having a shape that spreads from the end of the hanger portion 150 to the outer
  • the adapter member 151 includes an attachment portion 151b that fits into the inner peripheral surface of the end portion of the hanger portion 150, a large diameter portion 151a that has a larger diameter than the hanger portion 150, and And a flange portion 151c for connecting the two.
  • the sensor main body (main body) 152 includes a bearing 159 that rotatably supports an outer ring (outer portion) 152 a attached to the large-diameter portion 151 a of the adapter member 151 and the crankshaft 158.
  • An inner ring (inner portion) 152b assembled to the outer periphery of the outer ring 152b, and connection portions 152c and 152d that connect the upper end portions and the lower end portions of the outer ring 152a and the inner ring 152b.
  • the strain gauges 153 and 154 and the strain gauges 155 and 156 each of which is a set of two on the front surface and the back surface of the side surface of the connecting portion 152d that connects the lower ends of the outer ring 152a and the inner ring 152b, Along the respective side surfaces of the connecting portion 152d, they are attached in a posture orthogonal to each other.
  • the path for supporting the human power driving force from the crankshaft 158 via the bearing 155 forms the outer ring 152a and the inner ring 152b, and the upper ends thereof are And the lower end portions are connected to each other and concentrated on the connection portions 152c and 152d having an extremely small cross-sectional area. Therefore, when the electric bicycle receives a large impact from the ground or the like, the connection portions 152c and 152d may be damaged or deformed. In this case, there is a possibility that the measurement accuracy of the human driving force is greatly reduced or the human driving force cannot be measured, and the reliability as an electric bicycle is also reduced.
  • strain gauges 153 to 156 since four strain gauges 153 to 156 in total need to be attached to each side face in a posture orthogonal to each other on the front surface and the back surface of the side surface of the connecting portion 152d, the strain gauges 153 to 156 in the production process. Assembling man-hours increases. Further, since the strain gauges 153 to 156 must be positioned precisely at the time of assembly, there is a disadvantage that much labor is required.
  • the present invention solves the above-mentioned problems, and can use a general hanger part, can reduce the manufacturing cost, and at the same time, can be easily and quickly assembled, and has good reliability.
  • An object of the present invention is to provide a human-powered driving force detection device for an electric bicycle capable of maintaining the performance.
  • the human-power driving force detection device for an electric bicycle protrudes laterally from the hanger part, and the protruding part spreads to a stepped shape having a diameter larger than that of the hanger part.
  • a small-diameter cylindrical part attached to the inner periphery of the part, a large-diameter side wall extending radially from the end of the small-diameter cylindrical part, and a large-diameter cylindrical part extending in a cylindrical shape laterally from the large-diameter side wall.
  • the mounting member has an annular shape between the outer peripheral surface of the bearing that rotatably supports the crankshaft and the inner peripheral surface of the large-diameter cylindrical portion of the mounting member, and a part of the outer periphery is notched
  • a sensor support member having an elastically deformable portion that is shaped and thinner in the radial direction than a portion adjacent in the circumferential direction, and a strain detection sensor attached to the elastically deformable portion of the sensor support member. It is characterized by.
  • the mounting member having the large-diameter cylindrical portion is mounted so as to protrude laterally from the hanger portion, and between the outer peripheral surface of the bearing and the inner peripheral surface of the large-diameter cylindrical portion of the mounting member. Further, by disposing a sensor support member to which a strain detection sensor is attached, the sensor support member can be easily assembled while a hanger portion having the same shape as a general bicycle can be used. In addition, since the annular sensor support member is disposed inside the large-diameter cylindrical portion having a diameter larger than that of the hanger portion, the sensor support member can be used without any trouble even when the sensor support member has a diameter larger than that of the hanger portion. Can be assembled.
  • the sensor support member has an annular shape, and has a simple structure having an elastically deforming portion that is partially thin in the radial direction. Therefore, as the annular sensor support member, a member having a sufficient thickness in the radial direction including the elastic deformation portion and having a sufficient strength can be used. Even when receiving, the sensor support member is not damaged or deformed as the measurement accuracy of the sensor support member decreases.
  • the strain detection sensor is attached to the elastic deformation portion that is thin in the radial direction in the sensor support member, the number of strain detection sensors can be reduced, and the strain detection sensor can be attached to the elastic deformation portion. Assembly can be done easily and quickly.
  • the electric bicycle to which the human power driving force detection device of the present invention is assembled is a human power driving wheel such as a driving sprocket in which a driving power transmitting body such as a chain for rotating the rear wheel rotates integrally with the crankshaft.
  • the body and a driven wheel attached to the rear wheel and is configured to be able to add an auxiliary driving force based on a human driving force by a pedaling force from a pedal, and the elastic deformation portion includes the driving force.
  • the transmission body is elastically deformed by receiving a force that causes the crankshaft to be deformed rearward by a reaction force of a force pulling substantially forward by the human driving force.
  • the present invention is characterized in that the sensor support member is attached so that the circumferential posture of the sensor support member with respect to the crankshaft can be adjusted.
  • the sensor support member to which the strain detection sensor is attached can be attached in a state adjusted to a good posture.
  • the elastic deformation portion and the strain detection sensor are rearwardly inclined obliquely downward from a line passing through the axis of the crankshaft in parallel with the direction in which the driving force transmission body is pulled forward by the human-powered driving wheel in a side view. It is preferable to be arranged at the position, and by arranging in this way, not only can the force for pulling the driving force transmission body substantially forward be measured better, but also the actual result caused by how the pedal is depressed, etc. In this case, the influence of a force that does not contribute to pulling the upper portion of the driving force transmission body can be suppressed to a very low level, and the reliability is improved.
  • the mounting member includes a first mounting member having a small-diameter cylindrical portion, an enlarged side wall portion, and an outer peripheral portion of the large-diameter cylindrical portion, and an inner peripheral portion of the large-diameter cylindrical portion. It is comprised from the 2nd member for attachment which hold
  • a plurality of concave and convex portions are formed on the surfaces of the first mounting member and the second mounting member that are fitted to each other, and by changing the fitting position of the concave and convex portions, the sensor support member
  • the posture in the circumferential direction with respect to the crankshaft is adjustable. Accordingly, the circumferential posture of the sensor support member with respect to the crankshaft can be easily adjusted with a relatively simple configuration.
  • the present invention provides a mark that indicates a relative direction between a positioning portion that indicates an assembly position with respect to a sensor support member and a portion that is pulled by a manually driven wheel body in the drive force transmission body, on a mounting member to which the sensor support member is attached. And a portion.
  • the sensor support member can be disposed at an appropriate position even when performing an inspection confirmation process in production, repair after sales, and the like, and good reliability can be maintained.
  • three or more fixing members for fixing the sensor supporting member are provided, and at least two of these fixing members are arranged in a state in which the pressing force to the sensor supporting member can be adjusted. It is characterized by that.
  • the present invention provides an exterior member that is sheathed by the first attachment member and the second attachment member, and holds the concave and convex portions of the first attachment member and the second attachment member in a fitted state. And a coupling portion for coupling the exterior member and the second attachment member, and an exterior member fixing portion for securing the exterior member to the first attachment member.
  • the first mounting is not performed unless the fixing of the exterior member and the first mounting member by the exterior member fixing portion is released and the coupling between the exterior member and the second mounting member by the coupling portion is not released.
  • the concavo-convex portions of the working member and the second mounting member do not move in the separating direction, and the posture of the sensor support member to which the strain detection sensor is attached does not change. As a result, it is possible to satisfactorily prevent an unauthorized output variation of the strain detection sensor due to a change in the posture of the sensor support member, and it is possible to maintain good reliability as an electric bicycle.
  • the human power driving force detection device of the present invention is a strain detection sensor in which resin is injected into a portion corresponding to a shape part in which a part of the outer periphery is cut out while a wiring connected to the strain detection sensor is pulled out. Is waterproof. With this configuration, the strain detection sensor can be well waterproofed, and the reliability is improved.
  • a part of the outer periphery is notched inside the large-diameter cylindrical part that spreads in a stepped shape having a larger diameter than the hanger part, and is thinner in the radial direction than the part adjacent in the circumferential direction. Since the annular sensor support member having the elastically deformed portion is arranged, a general hanger portion can be used, and the annular sensor support member is sufficient including the elastically deformable portion. Use one with strength. Therefore, even when the electric bicycle is subjected to a large impact from the ground or the like, it is not damaged or deformed as the measurement accuracy of the sensor support member is lowered, and good reliability can be maintained. .
  • Side view for explaining arrangement positions of a sensor support member, a strain detection sensor and the like of the human power driving force detection device An exploded perspective view of a conventional human power driving force detection device (A) is a plan sectional view of a modified example of the conventional human-power-driving-force detecting device, and (b) is a side sectional view cut along line CC in FIG. 15 (a).
  • Exploded front sectional view of another conventional human power driving force detection device (A)-(c) are the left side view, the front view, and the right side view of the main body of the other conventional human power driving force detection device.
  • the left and right refers to the left and right direction in a state where the user rides on the electric bicycle and faces forward (traveling direction).
  • reference numeral 1 denotes an electric bicycle that is equipped with a human power driving force detection device according to an embodiment of the present invention and is also referred to as an electric assist bicycle.
  • this electric bicycle 1 includes a metal frame 2 including a head pipe 2a, a front fork 2b, a main pipe 2c, a standing pipe 2d, a chain stay 2e, a seat stay 2f, and the like, A front wheel 3 rotatably attached to the lower end of the fork 2b, a rear wheel 4 rotatably attached to the rear end of the chain stay 2e, a handle 5 that changes the direction of the front wheel 3, a saddle 6, and a crankshaft 7a and a crank arm 7b, a left and right pedal 8 to which a pedaling force as a manual driving force is applied, and an electric motor which generates an auxiliary driving force (assist force).
  • a control unit 11 as a control unit that performs various electrical controls including the electric motor 10, and power for driving the electric motor 10
  • a chain cover 21 and the like are provided.
  • the crank 7 rotates about the crankshaft 7a, and this manpower driving force is transmitted to the rear wheel via the drive sprocket 13, the chain 15, and the driven sprocket 14. 4 is rotated.
  • the electric motor 10 is built in a metal hub 16 (hereinafter also referred to as a front hub) disposed at the center of the front wheel 3.
  • the battery 12 is an example of a capacitor, and a secondary battery is preferable.
  • another example of the capacitor may be a capacitor.
  • the control unit (control unit) 11 includes a bottom bracket disposed at the center lower portion of the electric bicycle 1 so as to connect the rear end portion of the main pipe 2 c and the lower end portion of the standing pipe 2 d.
  • the cylindrical hanger 20 (refer also to FIGS. 3 and 4) and the front end of the chain stay 2e are supported in a suspended position via a support bracket 19 or the like arranged to connect the front end of the chain stay 2e.
  • the control unit 11 includes a control board, a storage circuit, a unit case, and the like that control each component (including the electric motor 10) of the electric bicycle 1.
  • a battery 12 is placed above the support bracket 19, and the battery 12 is disposed in a space between the standing pipe 2 d and the rear wheel 4 while being also locked to the standing pipe 2 d. .
  • a crankshaft 7a is inserted in the hanger portion 20 in the lateral direction (left and right horizontal direction).
  • a bearing 25 that rotatably supports the left side portion of the crankshaft 7 a is disposed inside the left end portion of the hanger portion 20.
  • a human power driving force detection device 30 having a mounting member 31 and a sensor support member 32 to be described later is disposed, and inside the portion where the human power driving force detection device 30 is provided.
  • a bearing 26 that rotatably supports the right side portion of the crankshaft 7a is disposed.
  • C-shaped ring bodies which regulates the position of the bearing 26 in the crankshaft 7a.
  • the drive sprocket 13 is attached to a location near the right side of the location where the manual driving force detection device 30 is provided on the crankshaft 7a.
  • the human-power-driving-force detecting device 30 has a mounting member 31 that protrudes to the right from the hanger part 20 and has a protruding part that has a stepped shape with a diameter larger than that of the hanger part, and a right part of the crankshaft 7a.
  • a sensor support member 32 annularly disposed between the outer peripheral surface of the bearing 26 to be supported and the inner peripheral surface of the large-diameter cylindrical portion 31c formed on the mounting member 31, and an elasticity formed on the sensor support member 32.
  • the strain detection sensor 33 is attached by being attached to the deformable portion 32a and the like, and the exterior member 36 that covers and holds the large diameter portion of the attachment member 31 and the like.
  • the mounting member 31 includes a small-diameter cylindrical portion 31a that is attached to the inner periphery of the right end portion of the hanger portion 20, a wide-diameter side wall portion 31b that extends radially from the end of the small-diameter cylindrical portion 31a, and this wide-diameter side wall portion 31b.
  • a large-diameter cylindrical portion 31c that extends in a cylindrical shape on the right side.
  • the mounting member 31 includes a first mounting member 34 that is a so-called sensor case and a second mounting member 35 that is a so-called sensor cover.
  • the first mounting member 34 is provided with a small-diameter cylindrical portion 31a, an enlarged side wall portion 31b, and an outer peripheral portion of the large-diameter cylindrical portion 31c (hereinafter referred to as the large-diameter cylindrical portion 34a of the first mounting member 34). It has been.
  • the second mounting member 35 has an inner peripheral portion of the large-diameter cylindrical portion 31c of the mounting member 31 (hereinafter referred to as a cylindrical portion 35d of the second mounting member 35), and the sensor support member 32.
  • a side wall covering portion 35a that is held from the outer periphery and extends in a disk shape in the radial direction from the right end portion of the cylindrical portion 35d is formed.
  • the side wall covering portion 35a covers the sensor support member 32, the right side surface of the bearing 26, and the like. Yes.
  • Screw portions 34d and 20a that are screwed to each other are formed on the outer peripheral surface of the small-diameter cylindrical portion 31a of the mounting member 31 (first mounting member 34) and the inner peripheral surface of the right end portion of the hanger portion 20 corresponding thereto.
  • the small diameter cylindrical portion 31 a of the mounting member 31 is coupled by being screwed into the inner periphery of the right end portion of the hanger portion 20.
  • a positioning fixing screw 37 that penetrates the hanger portion 20 and is screwed into the small-diameter cylindrical portion 31 a is provided at one location, and the mounting member 31 (first mounting member) is provided on the hanger portion 20.
  • the positioning fixing screw 37 is provided directly under the hanger portion 20.
  • the positioning position of the positioning fixing screw 37 may be provided at any position in the circumferential direction of the right end portion of the hanger portion 20.
  • the first mounting member 34 is attached and fixed to the hanger portion 20 in advance, and the sensor support member 32 is attached and fixed inside the second mounting member 35.
  • uneven portions 34b and 35b are provided on the inner peripheral surface of the large-diameter cylindrical portion 34a of the first mounting member 34 and the outer peripheral surface of the cylindrical portion 35d of the second mounting member 35.
  • a sealing material 38 or the like for enhancing waterproofness may be provided at a location that is not.
  • a mark portion 35c is formed at a predetermined position on the outer peripheral surface of the side wall covering portion 35a of the second mounting member 35 so that the sensor support member 32 is assembled at a predetermined position (details will be described later).
  • the sensor support member 32 has an elastically deformable portion 32 a having a shape in which a part of the outer periphery is cut out and being thinner in the radial direction than a portion adjacent in the circumferential direction.
  • the two notches 32 b are also formed in the inner peripheral portion of the sensor support member 32.
  • the bearing 26 and the sensor support member 32 abut only at the center part of the rear part, and the force from the crankshaft 7a is provided by the elastic deformation part 32a. It is comprised so that it may be favorably loaded to the location currently provided. Further, a concave groove 32c for determining the position with the second mounting member 35 is formed in one place on the outer peripheral surface of the sensor support member 32, and correspondingly, the second mounting member 35 On the inner peripheral surface of the cylindrical portion 35d, a rib 35e that fits into the groove 32c is formed at one location.
  • the second mounting member 35 is attached to the second mounting member 35.
  • the relative position of the sensor support member 32 is determined.
  • the strain detection sensor 33 is attached to the elastic deformation portion 32a of the sensor support member 32, for example. Therefore, the strain detection sensor 33 is disposed along a surface in contact with a line parallel to the axis of the crankshaft 7a.
  • the elastic deformation portion 32a to which the strain detection sensor 33 is attached is thinner in the radial direction than other adjacent portions in the circumferential direction, the entire sensor support member 32 has a sufficient thickness in the radial direction.
  • the elastic deformation portion 32a also has a sufficient thickness and sufficient strength.
  • the elastic deformation portion 32a of the sensor support member 32 and the strain detection sensor 33 are configured so that the crankshaft 7a is caused by the reaction force of the force that pulls the chain 15 substantially forward by the drive sprocket 13 by the manual driving force (stepping force) applied to the pedal 8. It is disposed at a position where it is elastically deformed by receiving a force to deform backward. Specifically, it is disposed at a position that is approximately behind the crankshaft 7a, but more specifically, is disposed at a position that is inclined slightly downward with respect to the crankshaft 7a. That is, as shown in FIG.
  • the drive sprocket 13 when viewed from the side, is parallel to the direction in which the upper portion of the chain 15 is pulled forward, and is inclined downward with respect to the line H passing through the axis 7b of the crankshaft 7a. More preferably, it is disposed at a rear position inclined downward by an angle ⁇ (for example, the inclination angle ⁇ is about 10 to 15 degrees).
  • ⁇ for example, the inclination angle ⁇ is about 10 to 15 degrees.
  • the line of the mark portion 35 c formed on the side wall covering portion 35 a of the second mounting member 35 is orthogonal to the line of the upper portion of the chain 15 that is in contact with the upper end of the drive sprocket 13. It is described to be. However, the present invention is not limited to this, and a mark may be formed so that the position (posture) of the second mounting member 35 to which the sensor support member 32 is assembled can be recognized.
  • reference numeral 39 in FIGS. 6, 7, 9, 10, etc. denotes a plurality (this embodiment) having one end connected to the strain detection sensor 33 attached to the elastic deformation portion 32a of the sensor support member 32 (this embodiment).
  • the other ends of these wiring portions 39 are connected to the substrate of the control unit 11 via connection cords or the like not shown.
  • An insertion hole 35g through which the wiring portion 39 passes is formed in the side wall covering portion 35a of the second mounting member 35.
  • the wiring part 39 passes through the insertion hole 35g and exits from the side wall covering part 35a of the second mounting member 35, and then bends to the left from the radially outer side along the outer peripheral part of the exterior member 36 and exits to the outside. Has been.
  • the wiring cover 42 is attached so that rainwater, dust, and the like do not enter the location where the strain detection sensor 33 is provided from the outside through the location where the insertion hole 35g is provided. Further, the location where the strain detection sensor 33 is disposed, that is, the elastically deforming portion 32a of the sensor support member 32, the large-diameter cylindrical portion 34a and the enlarged-diameter side wall portion 31b of the first mounting member 34 facing this, and the second mounting portion. A space surrounded by the cylindrical portion 35d and the side wall covering portion 35a of the member 35 is filled with a waterproof resin 41 or the like and sealed. In this embodiment, a part of the inner surface of the cylindrical portion 35d is cut away so that the wiring portion 39 does not contact the cylindrical portion 35d of the second mounting member 35, but the present invention is not limited to this. .
  • screw holes 35f for screwing fixing screws 43 as fixing members for fixing the sensor support member 32 to the second mounting member 35 are provided at three locations on the cylindrical portion 35d of the second mounting member 35. Is provided through the cylindrical portion 35d.
  • the fixing screw 43 is disposed in a state where the sensor support member 32 is shifted from the outer periphery in the circumferential direction by substantially the same angle, and is screwed to be embedded in the cylindrical portion 35d.
  • one screw hole 35f is formed through the rib 35e of the second mounting member 35, but the present invention is not limited to this.
  • the fixing screw 43 for fixing the sensor support member 32 is arranged in a state where the pressing force to the sensor support member 32 can be adjusted. And it is comprised so that the sensitivity adjustment of a distortion
  • the exterior member 36 includes a cylindrical portion 36a that covers the outer peripheral portion of the large-diameter cylindrical portion 34a of the first mounting member 34 and the side wall covering portion 35a of the second mounting member 35, and The side wall part 36b which covers the outer peripheral part in the diameter-expanded side wall part 31b of the 1 attachment member 34 from the side.
  • a threaded portion 36c is formed at a position closer to the right side on the inner peripheral surface of the large diameter cylindrical portion 34a of the exterior member 36.
  • a screw portion 35h is also formed on the outer periphery of the side wall covering portion 35a of the second attachment member 35, and the second attachment member 35 and the exterior member 36 are configured to be screwed together.
  • FIG. 9 no thread portion is formed on the outer periphery of the large-diameter cylindrical portion 34a of the first mounting member 34, and the first mounting member 34 and the exterior member 36 are Do not screw.
  • the exterior member 36 is provided with a fixing screw 44 as an exterior member fixing portion for fixing to the first attachment member 34 at one location.
  • Assembling work of the human power driving force detection device 30 is performed as follows. First, with the exterior member 36 inserted through the hanger part 20, the screw part 34 d of the first attachment member 34 is screwed into the screw part 20 a of the hanger part 20, and the first attachment member 34 is attached to the hanger part 20. . Further, a positioning fixing screw 37 penetrating the small-diameter cylindrical portion 31 a of the first attachment member 34 is screwed into the screw portion 20 a of the hanger portion 20 to fix the position of the first attachment member 34 with respect to the hanger portion 20.
  • the bearing 26 is assembled to the crankshaft 7a using the ring bodies 27A and 27B. Further, the sensor support member 32 having the strain detection sensor 33 attached to the elastic deformation portion 32a in advance is aligned so that the concave groove 32c of the sensor support member 32 fits into the rib 35e of the second attachment member 35. Then, the sensor support member 32 is fitted inside the cylindrical portion 35d of the second mounting member 35. Then, the fixing screws 43 provided at the three locations are screwed in to fix the sensor support member 32 to the second mounting member 35. At this time, the screw is adjusted by adjusting the pressing force of the fixing screw 43, thereby causing distortion. Adjustment is made so that the distortion is detected well from the detection sensor 33. If necessary, a waterproof resin 41 is filled around the strain detection sensor 33 with the seal cover 40 attached.
  • the second mounting member 35 to which the sensor support member 32 and the wiring cover 42 are assembled is fitted to the first mounting member 34 fixed to the hanger portion 20 while the concave and convex portions 35b and 34b formed on each other are fitted together. Assemble. At this time, such a posture that the mark portion 35c of the second mounting member 35 is orthogonal to the upper portion of the chain 15 in contact with the upper end of the drive sprocket 13 so that the strain detection sensor 33 is in an appropriate position. Then, the second mounting member 35 is assembled.
  • the exterior mounting member 36 is assembled while being rotated so that the threaded portion 36c is screwed with the threaded portion 35h of the second mounting member 35, and the sensor support member 32 is housed in the first mounting member. 34 and the second mounting member 35 are brought into close contact with each other. Finally, the positioning fixing screw 44 of the exterior member 36 is screwed to fix the position of the exterior member 36.
  • the strain detection sensor 33 is disposed at a position on the rear side of the annular sensor support member 32 that is inclined slightly lower than the position on the rear side of the crankshaft 7a.
  • the upper portion of the chain 15 that actually acts as the driving force for rotating the rear wheel is reduced while suppressing adverse effects such as the force that does not contribute to pulling the upper portion of the chain 15 due to the way the pedal 8 is depressed.
  • the pulling manpower driving force can be measured well.
  • the mounting member 31 (consisting of the first mounting member 34 and the second mounting member 35) having the large-diameter cylindrical portion 31 c protrudes laterally from the hanger portion 20.
  • the hanger portion 20 having the same shape as a general bicycle is provided by disposing the sensor support member 32 to which the strain detection sensor 33 is attached between the large diameter cylindrical portion 31c of the attachment member 31 and the bearing 26.
  • the sensor support member 32 can be easily assembled with a very simple configuration while using.
  • the sensor support member 32 has an annular shape, and has an extremely simple structure having an elastically deforming portion 32a that is partially thin in the radial direction. That is, as disclosed in Patent Document 3, the upper ends and the lower ends of the outer ring 152a and the inner ring 152b are connected to each other so as to concentrate on the connecting portions 156 and 157 having an extremely small cross-sectional area. The structure is not complicated and has a portion with reduced strength.
  • annular sensor support member 32 As the annular sensor support member 32, a relatively thick and sufficient strength including the elastic deformation portion 32a can be easily used. As a result, even when the electric bicycle 1 is subjected to a large impact from the ground or the like, the sensor support member 32 is not damaged or deformed so that the measurement accuracy of the sensor support member 32 is lowered. Sex can be maintained.
  • the strain detection sensor 33 is attached to the elastic deformation portion 32a that is thin in the radial direction in the sensor support member 32, the number of strain detection sensors 33 is small (one or two). ), And the assembly operation of the strain detection sensor 33 to the elastically deforming portion 32a can be performed easily and quickly.
  • the attachment member 31 is attached to the hanger part 20, the 1st attachment member 34 which has the outer peripheral part (large diameter cylinder part 34a) of the large diameter cylinder part 31c, and a large diameter cylinder part It comprises a second mounting member 35 that forms the inner peripheral portion (cylinder portion 35d) of 31c and holds the sensor support member 32 from the outer periphery.
  • the sensor support member 32 to which the strain detection sensor 33 is attached is adjusted to a good posture by using the uneven portions 34b and 35b provided on the first attachment member 34 and the second attachment member 35. Can be installed in the state.
  • the hanger part 20 can respond easily by changing the shape of the small diameter cylindrical part 31a of the member 34 for 1st attachment. Further, even when the diameter dimension of the sensor support member 32 is changed, it can be easily handled by changing the shape of the cylindrical portion 35d of the second attachment member 35. Further, the sensor support member 32 can be favorably held from both sides by the enlarged diameter side wall portion 31 b of the first mounting member 34 and the side wall cover portion 35 a of the second mounting member 35.
  • the mounting member 31 (second mounting member 35 in this embodiment) to which the sensor support member 32 is mounted has a rib 35e as a positioning portion indicating the mounting position with respect to the sensor support member 32, and the chain 15 is mounted. Since the mark portion 35c indicating the position is formed, the sensor support member 32 can be disposed at a suitable position even when performing a production inspection check process, repair after sales, or the like, and has good reliability. Can be maintained.
  • the positioning portion indicating the assembly position of the attachment member 31 (second attachment member 35) with respect to the sensor support member 32 is formed by the rib 35e or the concave groove 32c.
  • the present invention is not limited to this as long as the relative position can be determined.
  • the fixing screws 43 as the fixing members for fixing the sensor support member 32 are provided and the pressing force to the sensor support member 32 can be adjusted by the fixing screws 43. 43, the sensitivity adjustment of the strain detection sensor 33 can be easily performed. In addition, since the number of parts can be reduced as compared with the case where parts for adjusting sensitivity are separately provided, the manufacturing cost can be reduced. In addition, by providing three or more fixing screws 43 as fixing members, it is possible to arbitrarily set the pressing force to the sensor support member 32 to which the strain detection sensor 33 is attached in the circumferential direction. Two or more members that can adjust the pressing force to the sensor support member 32 may be provided. Further, four or more fixing screws 43 may be provided.
  • the exterior member 36 which is exteriorly covered by the 1st attachment member 34 and the 2nd attachment member 35, and hold
  • the fixing screw 44 is loosened and the screw portion 36c of the exterior member 36 is not detached from the screw portion 35h of the second mounting member 35 from the state where the human-power-driving force detection device 30 is completely assembled.
  • the relative positions of the first mounting member 34 and the second mounting member 35 are not shifted, and the concavo-convex portions 34b and 35b are not separated from each other.
  • unauthorized output fluctuation of the strain detection sensor 33 due to a change in the posture of the sensor support member 32 to which the strain detection sensor 33 is mounted. Can be prevented, and good reliability as an electric bicycle can be maintained.
  • the wiring portion 39 connected to the strain detection sensor 33 using the elastic deformation portion 32a of the sensor support member 32 to which the strain detection sensor is attached that is, the cutout portion of the sensor support member 32. Is pulled out from the side wall covering portion 35 a of the second mounting member 35. Then, a waterproof resin 41 is injected into a portion corresponding to the cutout portion of the sensor support member 32, and the connection portion between the strain detection sensor 33 and the wiring portion 39 of the strain detection sensor 33 gets wet with water that has entered from the outside. Prevents dirt and dirt. As a result, the strain detection sensor 33 is well protected and good reliability can be maintained. Further, the signal from the strain detection sensor 33 can be extracted to the outside while using the general hanger 20.
  • the present invention can be suitably applied to an electric bicycle that actually travels, but is not limited to this, and can also be applied to a fixed electric bicycle for training installed in a sports gym or the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

Provided is a human-powered drive force detection apparatus for an electric bicycle, the apparatus such that a general hanger unit can be used, manufacturing cost can be lowered, and high reliability can be maintained. A human-powered drive force detection apparatus (30) is provided with: an attaching member (31) laterally protruding from a hanger unit (20) with a protrusion portion extending in a stepped shape with a diameter greater than the hanger unit (20), and including a small-diameter cylinder portion (31a), an increased-diameter side wall portion (31b), and a large-diameter cylinder portion (31c); a sensor support member (32) disposed in ring shape between an outer peripheral surface of a bearing (26) that rotatably supports a crank shaft (7a) and an inner peripheral surface of the large-diameter cylinder portion (31c) of the attaching member (31), and including a resilient deformation portion (32a) with a radially reduced thickness due to a partially cut-out outer periphery; and a distortion detection sensor (33) attached to the resilient deformation portion (32a).

Description

電動自転車の人力駆動力検出装置Electric bicycle power detection device
　本発明は電動自転車の人力駆動力検出装置に関する。 The present invention relates to a human power driving force detection device for an electric bicycle.
　バッテリなどの蓄電器と、この蓄電器から給電される電動モータと、を有し、ペダルに加えられる踏力などの人力駆動力を、トルクセンサなどからなる人力駆動力検出装置により検出し、前記人力駆動力に、この人力駆動力に対応した電動モータの補助駆動力（アシスト力）を加えることで、上り坂等でも楽に走行できる電動自転車（電動アシスト自転車とも称せられる）は既に知られている。 A power storage device such as a battery; and an electric motor powered by the power storage device, wherein a human power driving force such as a pedaling force applied to a pedal is detected by a human power driving force detection device including a torque sensor, and the human power driving force In addition, there is already known an electric bicycle (also referred to as an electric assist bicycle) that can easily travel even on an uphill by applying an auxiliary driving force (assist force) of an electric motor corresponding to the human driving force.
　前記人力駆動力の検出方法の１例として、左右のペダルを踏み込んだ際にクランク軸が捩れる性質を利用し、クランク軸の外周表面やクランク軸からの人力駆動力が伝達される円筒軸の外周表面に、磁気異方性を付与した磁歪検出層を形成し、その外周に一定の隙間をあけてコイルを配設した磁歪式トルクセンサが知られている。この磁歪式トルクセンサでは、クランク軸の捩れ状態や、クランク軸からの人力駆動力が伝達される円筒軸の捩れ状態を検出している（特許文献１等）。なお、前記クランク軸や前記円筒軸（人力伝達回転軸と称す）は、ベアリング軸受などにより回転自在に支持されている。 As an example of the method for detecting the manpower driving force, by utilizing the property that the crankshaft is twisted when the left and right pedals are depressed, the outer peripheral surface of the crankshaft and the cylindrical shaft to which the manpower driving force from the crankshaft is transmitted are used. There is known a magnetostrictive torque sensor in which a magnetostrictive detection layer having magnetic anisotropy is formed on the outer peripheral surface, and a coil is disposed around the outer periphery of the magnetostrictive detection layer. This magnetostrictive torque sensor detects a twisted state of a crankshaft and a twisted state of a cylindrical shaft to which a manual driving force from the crankshaft is transmitted (Patent Document 1, etc.). Note that the crankshaft and the cylindrical shaft (referred to as a manpower transmission rotary shaft) are rotatably supported by bearings or the like.
　しかし、この磁歪式のトルクセンサは、磁歪発生部の加工やコイルが必要であり、多くの製造コストがかかるとともに工程管理も困難であり、多くの手間や時間がかかる短所がある。 However, this magnetostrictive torque sensor requires processing of a magnetostriction generating portion and a coil, which requires a lot of manufacturing costs and difficult process management, and has a lot of trouble and time.
　人力駆動力を検出する他の例として、特許文献２に開示された電動自転車のトルク検出装置がある。電動自転車を含めた自転車では、クランク軸などの人力伝達回転軸に、人力駆動輪体としての駆動スプロケット（前スプロケットや前ギヤ、クランクスプロケットとも称せられる）が取り付けられ、後輪に取り付けられた従動輪体としての従動スプロケットと、前記駆動スプロケットとにわたって、チェーンなどの駆動力伝達体が掛け渡されている。そして、人力駆動力が、前記駆動スプロケットから前記駆動力伝達体を介して前記従動輪体に伝達され、後輪が回転されることにより走行される。したがって、電動自転車でも、一般の自転車と同様に、走行時に、駆動スプロケットによってチェーンなどの駆動力伝達体を前方に引張る力が発生し、この反力によって、クランク軸が後方に弾性変形する。 Another example of detecting human power driving force is a torque detection device for an electric bicycle disclosed in Patent Document 2. In bicycles including electric bicycles, a driving sprocket (also called front sprocket, front gear, or crank sprocket) as a manpower driven wheel is attached to a manpower transmission rotating shaft such as a crankshaft, and a slave attached to the rear wheel. A driving force transmission body such as a chain is stretched over a driven sprocket as a moving wheel body and the driving sprocket. Then, the manpower driving force is transmitted from the driving sprocket to the driven wheel body via the driving force transmitting body, and the rear wheel is rotated to travel. Therefore, even in an electric bicycle, like a general bicycle, a force that pulls a driving force transmitting body such as a chain forward is generated by the driving sprocket during traveling, and the crankshaft is elastically deformed backward by this reaction force.
　前記特許文献２に開示された電動自転車のトルク検出装置は、自転車の上記構造を応用したものである。図１４や図１５（ａ）、（ｂ）に示すように、クランク軸１０１が後方に弾性変形しようとする力をクランク軸１０１から受けて支持する薄板状の弾性変形部（支持板部）１０２を設け、この弾性変形部１０２に、その弾性変形量を検出する歪み検出センサ（歪みゲージ）１０３を取り付けている。なお、弾性変形部１０２および歪み検出センサ１０３は、図１４に示す構造においては、ハンガ部１０４（ボトムブラケットとも称せられる）の周囲に箱状の保持枠部１０５を形成し、この保持枠部１０５により弾性変形部１０２を支持している。また、図１５（ａ）、（ｂ）に示す構造においては、ハンガ部１０４を特殊な形状として弾性変形部１０２を支持している。 The torque detection device for an electric bicycle disclosed in Patent Document 2 applies the above structure of the bicycle. As shown in FIGS. 14, 15 (a), and 15 (b), a thin plate-like elastic deformation portion (support plate portion) 102 that receives and supports a force from which the crankshaft 101 is elastically deformed rearward from the crankshaft 101. A strain detection sensor (strain gauge) 103 for detecting the amount of elastic deformation is attached to the elastic deformation portion 102. In the structure shown in FIG. 14, the elastic deformation portion 102 and the strain detection sensor 103 are formed with a box-shaped holding frame portion 105 around a hanger portion 104 (also referred to as a bottom bracket). The elastic deformation part 102 is supported. In the structures shown in FIGS. 15A and 15B, the elastic deformation portion 102 is supported with the hanger portion 104 having a special shape.
　ところが、図１４や図１５（ａ）、（ｂ）に示す構造では、構造自体は簡単ではあるものの、ハンガ部１０４の周囲に保持枠部１０５を形成したり、ハンガ部１０４を特殊な形状としたりしているので、一般の自転車に適用することが困難である難点がある。 However, in the structure shown in FIGS. 14 and 15A and 15B, the structure itself is simple, but the holding frame part 105 is formed around the hanger part 104, or the hanger part 104 is formed in a special shape. Therefore, there is a difficulty that it is difficult to apply to a general bicycle.
　この難点に対処可能な構造として、特許文献３には、図１６～図１９に示すように、ハンガ部１５０の端部から外周に広がるような形状のアダプタ部材１５１と、このアダプタ部材１５１に形成された太径部１５１ａの内側に嵌め込まれる主本体（センサ本体部）１５２とを設け、前記センサ本体部１５２の一部に、歪み計１５３、１５４、１５５、１５６を貼り付けた構成のものが開示されている。ここで、図１６～図１８に示すように、アダプタ部材１５１は、ハンガ部１５０の端部内周面に嵌まり込む取付部１５１ｂと、ハンガ部１５０よりも大きい径の太径部１５１ａと、これらを接続するフランジ部１５１ｃとを有する。また、図１９に示すように、センサ本体部（主本体）１５２は、アダプタ部材１５１の太径部１５１ａに取り付けられる外リング（外側部分）１５２ａと、クランク軸１５８を回転自在に支持する軸受１５９の外周に組みつけられる内リング（内側部分）１５２ｂと、これらの外リング１５２ａと内リング１５２ｂとの上端部同士と下端部同士とを接続する接続部１５２ｃ、１５２ｄとを有する。そして、外リング１５２ａと内リング１５２ｂとの下端部同士を接続する接続部１５２ｄの側面における表面と裏面とに、それぞれ２枚組みとなった歪み計１５３、１５４と歪み計１５５、１５６とが、接続部１５２ｄの各側面に沿うとともに互いに直交する姿勢で貼り付けられている。 As a structure that can cope with this difficulty, Patent Document 3 discloses, as shown in FIGS. 16 to 19, an adapter member 151 having a shape that spreads from the end of the hanger portion 150 to the outer periphery, and the adapter member 151. A main body (sensor main body) 152 to be fitted inside the large-diameter portion 151a, and strain gauges 153, 154, 155, 156 are attached to a part of the sensor main body 152. It is disclosed. Here, as shown in FIGS. 16 to 18, the adapter member 151 includes an attachment portion 151b that fits into the inner peripheral surface of the end portion of the hanger portion 150, a large diameter portion 151a that has a larger diameter than the hanger portion 150, and And a flange portion 151c for connecting the two. As shown in FIG. 19, the sensor main body (main body) 152 includes a bearing 159 that rotatably supports an outer ring (outer portion) 152 a attached to the large-diameter portion 151 a of the adapter member 151 and the crankshaft 158. An inner ring (inner portion) 152b assembled to the outer periphery of the outer ring 152b, and connection portions 152c and 152d that connect the upper end portions and the lower end portions of the outer ring 152a and the inner ring 152b. And, the strain gauges 153 and 154 and the strain gauges 155 and 156, each of which is a set of two on the front surface and the back surface of the side surface of the connecting portion 152d that connects the lower ends of the outer ring 152a and the inner ring 152b, Along the respective side surfaces of the connecting portion 152d, they are attached in a posture orthogonal to each other.
　この構造によれば、一般的なハンガ部１５０に、アダプタ部材１５１およびセンサ本体部（主本体）１５２を組み付けることができるので、一般的な自転車のフレーム構造を有する電動自転車を実現できる。 According to this structure, since the adapter member 151 and the sensor main body (main main body) 152 can be assembled to the general hanger 150, an electric bicycle having a general bicycle frame structure can be realized.
特開平９－９５２８９号公報JP-A-9-95289 特開２００２－１９６８３号公報JP 2002-19683 A 欧州特許公開２２４８７１５号公報European Patent Publication No. 2248715
　しかしながら、特許文献３に開示されている構造では、軸受１５５を介してクランク軸１５８からの人力駆動力を支持する経路が、外リング１５２ａと内リング１５２ｂとを形成するとともに、これらの上端部同士と下端部同士とを接続して、極めて小さな断面積である接続部１５２ｃ、１５２ｄに集中する構造である。したがって、電動自転車に対して地面などから大きな衝撃を受けた際に、前記接続部１５２ｃ、１５２ｄが損傷したり、変形したりする恐れがある。この場合には、人力駆動力の測定精度が大きく低下したり、人力駆動力を測定できなくなったりする恐れがあり、電動自転車としての信頼性も低下する。 However, in the structure disclosed in Patent Document 3, the path for supporting the human power driving force from the crankshaft 158 via the bearing 155 forms the outer ring 152a and the inner ring 152b, and the upper ends thereof are And the lower end portions are connected to each other and concentrated on the connection portions 152c and 152d having an extremely small cross-sectional area. Therefore, when the electric bicycle receives a large impact from the ground or the like, the connection portions 152c and 152d may be damaged or deformed. In this case, there is a possibility that the measurement accuracy of the human driving force is greatly reduced or the human driving force cannot be measured, and the reliability as an electric bicycle is also reduced.
　また、接続部１５２ｄの側面における表面と裏面とに、合わせて４枚の歪み計１５３～１５６を、各側面において互いに直交する姿勢で貼り付けられなければならないので、生産工程における歪み計１５３～１５６の組付工数が多くなる。また、組付時の歪み計１５３～１５６の位置決めも厳密に行わなければならないため、多くの手間がかかる短所もある。 In addition, since four strain gauges 153 to 156 in total need to be attached to each side face in a posture orthogonal to each other on the front surface and the back surface of the side surface of the connecting portion 152d, the strain gauges 153 to 156 in the production process. Assembling man-hours increases. Further, since the strain gauges 153 to 156 must be positioned precisely at the time of assembly, there is a disadvantage that much labor is required.
　本発明は上記課題を解決するもので、一般的なハンガ部を用いることができて、製造コストの低減化を図ることができると同時に、組付作業も容易かつ迅速に行え、しかも良好な信頼性を維持することができる電動自転車の人力駆動力検出装置を提供することを目的とする。 The present invention solves the above-mentioned problems, and can use a general hanger part, can reduce the manufacturing cost, and at the same time, can be easily and quickly assembled, and has good reliability. An object of the present invention is to provide a human-powered driving force detection device for an electric bicycle capable of maintaining the performance.
　上記課題を解決するために、本発明の電動自転車の人力駆動力検出装置は、ハンガ部から側方に突出しかつ突出した部分がハンガ部よりも太径の段つき形状に広がり、ハンガ部の端部内周に取り付けられる細径筒部と、この細径筒部の端部から径方向に広がる拡径側壁部と、この拡径側壁部より側方に筒状に延びる太径筒部と、を有する取付用部材と、クランク軸を回転自在に支持する軸受の外周面と前記取付用部材の太径筒部の内周面との間に環状に配設され、外周の一部が切欠かれた形状とされて周方向に隣接する部分よりも径方向に薄肉となった弾性変形部を有するセンサ支持部材と、このセンサ支持部材の弾性変形部に取り付けられた歪検出センサとを備えていることを特徴とする。 In order to solve the above-described problems, the human-power driving force detection device for an electric bicycle according to the present invention protrudes laterally from the hanger part, and the protruding part spreads to a stepped shape having a diameter larger than that of the hanger part. A small-diameter cylindrical part attached to the inner periphery of the part, a large-diameter side wall extending radially from the end of the small-diameter cylindrical part, and a large-diameter cylindrical part extending in a cylindrical shape laterally from the large-diameter side wall. The mounting member has an annular shape between the outer peripheral surface of the bearing that rotatably supports the crankshaft and the inner peripheral surface of the large-diameter cylindrical portion of the mounting member, and a part of the outer periphery is notched A sensor support member having an elastically deformable portion that is shaped and thinner in the radial direction than a portion adjacent in the circumferential direction, and a strain detection sensor attached to the elastically deformable portion of the sensor support member. It is characterized by.
　この構成によれば、太径筒部を有する取付用部材を、ハンガ部から側方に突出するように取付け、軸受の外周面と前記取付用部材の太径筒部の内周面との間に、歪検出センサを取り付けたセンサ支持部材を配設することで、一般の自転車と同様な形状のハンガ部を用いることができながら、容易にセンサ支持部材を組み付けることができる。また、ハンガ部よりも太径の太径筒部の内側に環状のセンサ支持部材を配設する構成であるので、センサ支持部材がハンガ部よりも太径である場合などでも支障なくセンサ支持部材を組み付けることができる。さらに、センサ支持部材が環状であり、一部に径方向に薄肉となった弾性変形部を有する簡単な構造である。したがって、環状のセンサ支持部材として、弾性変形部をも含めて径方向に十分な厚みを有して、十分な強度を有するものを用いることができて、電動自転車に対して地面などから大きな衝撃を受けた際でも、センサ支持部材の測定精度が低下するほど損傷したり、変形したりすることがない。また、センサ支持部材において径方向に薄肉となった弾性変形部に歪検出センサを貼り付ける構成であるので、歪検出センサを少ない枚数で済ますことができるとともに、歪検出センサの弾性変形部への組付け作業も容易かつ迅速に行える。 According to this configuration, the mounting member having the large-diameter cylindrical portion is mounted so as to protrude laterally from the hanger portion, and between the outer peripheral surface of the bearing and the inner peripheral surface of the large-diameter cylindrical portion of the mounting member. Further, by disposing a sensor support member to which a strain detection sensor is attached, the sensor support member can be easily assembled while a hanger portion having the same shape as a general bicycle can be used. In addition, since the annular sensor support member is disposed inside the large-diameter cylindrical portion having a diameter larger than that of the hanger portion, the sensor support member can be used without any trouble even when the sensor support member has a diameter larger than that of the hanger portion. Can be assembled. Further, the sensor support member has an annular shape, and has a simple structure having an elastically deforming portion that is partially thin in the radial direction. Therefore, as the annular sensor support member, a member having a sufficient thickness in the radial direction including the elastic deformation portion and having a sufficient strength can be used. Even when receiving, the sensor support member is not damaged or deformed as the measurement accuracy of the sensor support member decreases. In addition, since the strain detection sensor is attached to the elastic deformation portion that is thin in the radial direction in the sensor support member, the number of strain detection sensors can be reduced, and the strain detection sensor can be attached to the elastic deformation portion. Assembly can be done easily and quickly.
　また、本発明の人力駆動力検出装置が組みつけられる電動自転車は、後輪を回転駆動させるためのチェーンなどの駆動力伝達体が、クランク軸と一体的に回転する駆動スプロケットなどの人力駆動輪体と、後輪に取り付けられた従動輪体とにわたって架け渡され、ペダルからの踏力による人力駆動力に基づいて補助駆動力を付加可能に構成されており、前記弾性変形部は、前記駆動力伝達体を、前記人力駆動力により略前方に引張る力の反力によりクランク軸が後方に変形しようとする力を受けて弾性変形することを特徴とする。 In addition, the electric bicycle to which the human power driving force detection device of the present invention is assembled is a human power driving wheel such as a driving sprocket in which a driving power transmitting body such as a chain for rotating the rear wheel rotates integrally with the crankshaft. The body and a driven wheel attached to the rear wheel, and is configured to be able to add an auxiliary driving force based on a human driving force by a pedaling force from a pedal, and the elastic deformation portion includes the driving force. The transmission body is elastically deformed by receiving a force that causes the crankshaft to be deformed rearward by a reaction force of a force pulling substantially forward by the human driving force.
　この構成により、ペダルを踏み込んだ際にクランク軸などにかけられる人力駆動力における、チェーンなどの駆動力伝達体を介して後輪に伝達されて、実際に走行に寄与する人力駆動力を良好に測定することができる。 With this configuration, the manual driving force that is applied to the crankshaft and the like when the pedal is depressed is transmitted to the rear wheel via a driving force transmission body such as a chain, and the human driving force that actually contributes to running is well measured. can do.
　また、本発明は、センサ支持部材が、センサ支持部材のクランク軸に対する周方向の姿勢を調整可能に取り付けられていることを特徴とする。この構成により、歪検出センサが取り付けられたセンサ支持部材を、良好な姿勢に調整した状態で取り付けることができる。ここで、弾性変形部および歪検出センサは、側面視して、人力駆動輪体により駆動力伝達体を前方に引張る方向と平行でクランク軸の軸心を通る線よりも斜め下方に傾斜した後方位置に配設されていることが好適であり、このように配設することで、駆動力伝達体を略前方に引張る力をより良好に測定できるだけでなく、ペダルの踏み方などに起因する実際には駆動力伝達体の上側部分を引張ることに寄与しない力などの影響を極めて少なく抑えることができて、信頼性が向上する。 Further, the present invention is characterized in that the sensor support member is attached so that the circumferential posture of the sensor support member with respect to the crankshaft can be adjusted. With this configuration, the sensor support member to which the strain detection sensor is attached can be attached in a state adjusted to a good posture. Here, the elastic deformation portion and the strain detection sensor are rearwardly inclined obliquely downward from a line passing through the axis of the crankshaft in parallel with the direction in which the driving force transmission body is pulled forward by the human-powered driving wheel in a side view. It is preferable to be arranged at the position, and by arranging in this way, not only can the force for pulling the driving force transmission body substantially forward be measured better, but also the actual result caused by how the pedal is depressed, etc. In this case, the influence of a force that does not contribute to pulling the upper portion of the driving force transmission body can be suppressed to a very low level, and the reliability is improved.
　また、本発明は、前記取付用部材が、細径筒部と拡径側壁部と太径筒部の外周部分とを有する第１取付用部材と、太径筒部の内周部分をなしてセンサ支持部材を外周から保持する第２取付用部材とから構成されていることを特徴とする。この構成により、ハンガ部の形状などが異なっている場合には、第１取付用部材の細径筒部の形状を変更することで容易に対応できる。また、センサ支持部材の形状が変更された場合でも、第２取付用部材の形状を変更することで容易に対応できる。 Further, according to the present invention, the mounting member includes a first mounting member having a small-diameter cylindrical portion, an enlarged side wall portion, and an outer peripheral portion of the large-diameter cylindrical portion, and an inner peripheral portion of the large-diameter cylindrical portion. It is comprised from the 2nd member for attachment which hold | maintains a sensor support member from outer periphery, It is characterized by the above-mentioned. With this configuration, when the shape of the hanger portion is different, it can be easily handled by changing the shape of the small-diameter cylindrical portion of the first mounting member. Further, even when the shape of the sensor support member is changed, it can be easily handled by changing the shape of the second mounting member.
　また、本発明は、第１取付用部材と第２取付用部材との互いに嵌合する面に、複数の凹凸部が形成され、この凹凸部の嵌合位置を変えることで、センサ支持部材のクランク軸に対する周方向の姿勢を調整可能とされていることを特徴とする。これにより、比較的簡単な構成で、センサ支持部材のクランク軸に対する周方向の姿勢を容易に調整することができる。 Further, according to the present invention, a plurality of concave and convex portions are formed on the surfaces of the first mounting member and the second mounting member that are fitted to each other, and by changing the fitting position of the concave and convex portions, the sensor support member The posture in the circumferential direction with respect to the crankshaft is adjustable. Accordingly, the circumferential posture of the sensor support member with respect to the crankshaft can be easily adjusted with a relatively simple configuration.
　また、本発明は、センサ支持部材が取り付けられる取付用部材に、センサ支持部材に対する組み付け位置を示す位置決め部と、前記駆動力伝達体における人力駆動輪体により引張られる箇所との相対方向をしめす目印部とを設けたことを特徴とする。これにより、生産上の検査確認工程や、販売後の修理等を行う際でも、適した位置にセンサ支持部材を配設できて、良好な信頼性を維持することができる。 Further, the present invention provides a mark that indicates a relative direction between a positioning portion that indicates an assembly position with respect to a sensor support member and a portion that is pulled by a manually driven wheel body in the drive force transmission body, on a mounting member to which the sensor support member is attached. And a portion. As a result, the sensor support member can be disposed at an appropriate position even when performing an inspection confirmation process in production, repair after sales, and the like, and good reliability can be maintained.
　また、本発明は、センサ支持部材を固定する固定部材が３つ以上設けられ、これらの固定部材のうちの少なくとも２つが、センサ支持部材への押圧力を調整可能な状態で配設されていることを特徴とする。この構成により、センサ支持部材を固定する固定部材を用いて、歪検出センサの感度調整も容易に行うことができるとともに、歪検出センサの感度調整用の部品を別途に設ける場合と比較して部品点数を削減することができる。 In the present invention, three or more fixing members for fixing the sensor supporting member are provided, and at least two of these fixing members are arranged in a state in which the pressing force to the sensor supporting member can be adjusted. It is characterized by that. With this configuration, it is possible to easily adjust the sensitivity of the strain detection sensor by using the fixing member that fixes the sensor support member, and also compared to the case where a separate component for adjusting the sensitivity of the strain detection sensor is provided. The score can be reduced.
　また、本発明は、第１取付用部材および第２取付用部材に外装されて、第１取付用部材と第２取付用部材との各凹凸部同士が嵌合した状態に保持する外装部材を設け、この外装部材と前記第２取付用部材とを結合する結合部と、外装部材を前記第１取付用部材に固定する外装部材固定部とを設けたことを特徴とする。この構成によれば、外装部材固定部による外装部材と第１取付用部材との固定が解除され、かつ、結合部による外装部材と第２取付用部材との結合が解除されない限り、第１取付用部材と第２取付用部材との各凹凸部同士が離脱方向に移動して、歪検出センサを取り付けたセンサ支持部材の姿勢が変わることがない。これにより、センサ支持部材の姿勢が変わることによる不正な歪検出センサの出力変動を良好に防止することができ、電動自転車として良好な信頼性を維持することができる。 Further, the present invention provides an exterior member that is sheathed by the first attachment member and the second attachment member, and holds the concave and convex portions of the first attachment member and the second attachment member in a fitted state. And a coupling portion for coupling the exterior member and the second attachment member, and an exterior member fixing portion for securing the exterior member to the first attachment member. According to this configuration, the first mounting is not performed unless the fixing of the exterior member and the first mounting member by the exterior member fixing portion is released and the coupling between the exterior member and the second mounting member by the coupling portion is not released. The concavo-convex portions of the working member and the second mounting member do not move in the separating direction, and the posture of the sensor support member to which the strain detection sensor is attached does not change. As a result, it is possible to satisfactorily prevent an unauthorized output variation of the strain detection sensor due to a change in the posture of the sensor support member, and it is possible to maintain good reliability as an electric bicycle.
　また、本発明の人力駆動力検出装置は、歪検出センサに接続された配線を引き出した状態で、外周の一部が切欠かれた形状部分に相当する箇所に樹脂が注入されて、歪検出センサが防水されていることを特徴とする。この構成により、歪検出センサを良好に防水することができ、信頼性が向上する。 Further, the human power driving force detection device of the present invention is a strain detection sensor in which resin is injected into a portion corresponding to a shape part in which a part of the outer periphery is cut out while a wiring connected to the strain detection sensor is pulled out. Is waterproof. With this configuration, the strain detection sensor can be well waterproofed, and the reliability is improved.
　本発明によれば、ハンガ部よりも太径の段つき形状に広がる太径筒部の内側に、外周の一部が切欠かれた形状とされて周方向に隣接する部分よりも径方向に薄肉となった弾性変形部を有する環状のセンサ支持部材を配設する構成であるので、一般的なハンガ部を用いることができるとともに、環状のセンサ支持部材として、弾性変形部をも含めて十分な強度を有するものを用いる。したがって、電動自転車に対して地面などから大きな衝撃を受けた際でも、センサ支持部材の測定精度が低下するほど損傷したり、変形したりすることがなく、良好な信頼性を維持することができる。 According to the present invention, a part of the outer periphery is notched inside the large-diameter cylindrical part that spreads in a stepped shape having a larger diameter than the hanger part, and is thinner in the radial direction than the part adjacent in the circumferential direction. Since the annular sensor support member having the elastically deformed portion is arranged, a general hanger portion can be used, and the annular sensor support member is sufficient including the elastically deformable portion. Use one with strength. Therefore, even when the electric bicycle is subjected to a large impact from the ground or the like, it is not damaged or deformed as the measurement accuracy of the sensor support member is lowered, and good reliability can be maintained. .
本発明の実施の形態に係る人力駆動力検出装置を備えた電動自転車の全体側面図The whole side view of the electric bicycle provided with the manpower driving force detecting device concerning an embodiment of the invention 同電動自転車の後部側面図Rear side view of the electric bicycle 同電動自転車のペダル、クランク、ハンガ部およびその近傍箇所の斜視図Perspective view of pedal, crank, hanger part and its vicinity of the electric bicycle 同電動自転車の人力駆動力検出装置およびその近傍箇所の斜視図Perspective view of human-powered driving force detection device of electric bicycle and its vicinity 同人力駆動力検出装置およびその近傍箇所の背面図Rear view of Doujin force driving force detection device and its vicinity 同人力駆動力検出装置およびその近傍箇所の部分切欠斜視図Doujin force driving force detection device and partially cutaway perspective view of the vicinity thereof 同人力駆動力検出装置およびその近傍箇所の断面図（但し下半部は、歪検出センサが設けられている部分で切断）Cross-sectional view of the human power driving force detection device and the vicinity thereof (however, the lower half is cut at a portion where a strain detection sensor is provided) 同人力駆動力検出装置およびその近傍箇所の縦断面図Longitudinal cross-sectional view of the human power driving force detection device and its vicinity 同人力駆動力検出装置およびその近傍箇所の分解斜視図Disassembled perspective view of the human power driving force detection device and its vicinity 同人力駆動力検出装置およびその近傍箇所の分解斜視図Disassembled perspective view of the human power driving force detection device and its vicinity 同人力駆動力検出装置およびその近傍箇所の、第２取付用部材やセンサ支持部材などを取り付けていない状態での縦断面図Longitudinal sectional view of the human power driving force detection device and the vicinity thereof with no second mounting member or sensor support member attached. 同人力駆動力検出装置およびその近傍箇所の、第２取付用部材やセンサ支持部材などを取り付けていない状態での部分切欠斜視図Partial cutaway perspective view of the same human power driving force detection device and the vicinity thereof with no second mounting member or sensor support member attached. 同人力駆動力検出装置のセンサ支持部材および歪検出センサなどの配設位置を説明するための側面図Side view for explaining arrangement positions of a sensor support member, a strain detection sensor and the like of the human power driving force detection device 従来の人力駆動力検出装置の分解斜視図An exploded perspective view of a conventional human power driving force detection device （ａ）は同従来の人力駆動力検出装置の変形例の平面断面図、（ｂ）は図１５（ａ）のＣ－Ｃ線で切断した側面断面図(A) is a plan sectional view of a modified example of the conventional human-power-driving-force detecting device, and (b) is a side sectional view cut along line CC in FIG. 15 (a). 他の従来の人力駆動力検出装置が設けられているクランク軸およびその近傍箇所の正面断面図Front sectional view of a crankshaft provided with another conventional human-power-driving-force detecting device and its vicinity 同他の従来の人力駆動力検出装置の正面断面図Front sectional view of another conventional human power driving force detection device 同他の従来の人力駆動力検出装置の分解正面断面図Exploded front sectional view of another conventional human power driving force detection device （ａ）～（ｃ）は同他の従来の人力駆動力検出装置の主本体の左側面図、正面図および右側面図(A)-(c) are the left side view, the front view, and the right side view of the main body of the other conventional human power driving force detection device.
　以下、本発明の実施の形態に係る電動自転車および電動自転車の人力駆動力検出装置について図面に基づき説明する。なお、以下の説明における左右とは、電動自転車に搭乗して前方（進行方向）に向いた状態での左右方向をいう。 Hereinafter, an electric bicycle and a human-powered driving force detection device for an electric bicycle according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the left and right refers to the left and right direction in a state where the user rides on the electric bicycle and faces forward (traveling direction).
　図１、図２における１は本発明の実施の形態に係る人力駆動力検出装置を備えており、電動アシスト自転車とも称される電動自転車である。図１、図２に示すように、この電動自転車１は、ヘッドパイプ２ａ、前フォーク２ｂ、メインパイプ２ｃ、立パイプ２ｄ、チェーンステー２ｅ、シートステー２ｆなどからなる金属製のフレーム２と、前フォーク２ｂの下端に回転自在に取り付けられた前輪３と、チェーンステー２ｅの後端に回転自在に取り付けられた後輪４と、前輪３の向きを変更するハンドル５と、サドル６と、クランク軸７ａおよびクランクアーム７ｂからなるクランク７と、クランク７の両端部に回転自在に取り付けられ、人力駆動力としての踏力が加えられる左右のペダル８と、補助駆動力（アシスト力）を発生させる電動モータ１０と、電動モータ１０を含めた各種の電気的制御を行う制御部としての制御ユニット１１と、電動モータ１０に駆動用の電力を供給する二次電池からなるバッテリ１２と、ハンドル５などに取り付けられて、搭乗者などが操作可能な手元操作部（図示せず）と、クランク７と一体的に回転するように取り付けられた人力駆動輪体としての駆動スプロケット（前スプロケットや前ギヤ、クランクスプロケットやクランクギヤとも称せられる）１３と、後輪４のハブ（後ハブとも称せられる）９に取り付けられた従動輪体としての従動スプロケット（後スプロケットや後ギヤ、後輪ギヤとも称せられる）１４と、駆動スプロケット１３と従動スプロケット１４とにわたって架け渡された無端状の駆動力伝達体としてのチェーン１５と、チェーン１５などを側方から覆うチェーンカバー２１などを備えている。 In FIG. 1 and FIG. 2, reference numeral 1 denotes an electric bicycle that is equipped with a human power driving force detection device according to an embodiment of the present invention and is also referred to as an electric assist bicycle. As shown in FIGS. 1 and 2, this electric bicycle 1 includes a metal frame 2 including a head pipe 2a, a front fork 2b, a main pipe 2c, a standing pipe 2d, a chain stay 2e, a seat stay 2f, and the like, A front wheel 3 rotatably attached to the lower end of the fork 2b, a rear wheel 4 rotatably attached to the rear end of the chain stay 2e, a handle 5 that changes the direction of the front wheel 3, a saddle 6, and a crankshaft 7a and a crank arm 7b, a left and right pedal 8 to which a pedaling force as a manual driving force is applied, and an electric motor which generates an auxiliary driving force (assist force). 10, a control unit 11 as a control unit that performs various electrical controls including the electric motor 10, and power for driving the electric motor 10 A battery 12 made of a secondary battery, a hand operation unit (not shown) that is attached to the handle 5 and can be operated by a passenger, and a human-powered drive that is attached to rotate integrally with the crank 7 A drive sprocket (also called a front sprocket or front gear, a crank sprocket or a crank gear) 13 as a ring body and a driven sprocket as a driven wheel body attached to a hub (also called a rear hub) 9 of the rear wheel 4 (Also referred to as a rear sprocket, rear gear, or rear wheel gear) 14, a chain 15 as an endless driving force transmission member spanning the drive sprocket 13 and the driven sprocket 14, and the chain 15 and the like are covered from the side. A chain cover 21 and the like are provided.
　そして、ペダル８に人力駆動力である踏力が加えられると、クランク７がクランク軸７ａを中心に回転し、この人力駆動力が、駆動スプロケット１３、チェーン１５、および従動スプロケット１４を介して後輪４に伝達されて回転される。なお、この実施の形態では、電動モータ１０が、前輪３の中心部に配設されている金属製のハブ（以下、前ハブとも称する）１６に内蔵されている。また、バッテリ１２は蓄電器の一例であり、二次電池が好適であるが、蓄電器の他の例としてはキャパシタなどであってもよい。 When a pedaling force, which is a manpower driving force, is applied to the pedal 8, the crank 7 rotates about the crankshaft 7a, and this manpower driving force is transmitted to the rear wheel via the drive sprocket 13, the chain 15, and the driven sprocket 14. 4 is rotated. In this embodiment, the electric motor 10 is built in a metal hub 16 (hereinafter also referred to as a front hub) disposed at the center of the front wheel 3. In addition, the battery 12 is an example of a capacitor, and a secondary battery is preferable. However, another example of the capacitor may be a capacitor.
　図２に示すように、制御ユニット（制御部）１１は、電動自転車１の中央下部に、メインパイプ２ｃの後端部と立パイプ２ｄの下端部とを連結するように配設されたボトムブラケットとも称せられる円筒形状のハンガ部２０（図３、図４なども参照）とチェーンステー２ｅの前端部とを連結するように配設された支持ブラケット１９などを介して吊り下げられた姿勢で支持されている。制御ユニット１１は、電動自転車１の各構成要素（電動モータ１０を含む）の制御を行う制御基板や記憶回路やユニットケースなどから構成されている。また、支持ブラケット１９の上方にバッテリ１２が載せられており、バッテリ１２は、立パイプ２ｄにも係止された状態で、立パイプ２ｄと後輪４との間の空間に配設されている。 As shown in FIG. 2, the control unit (control unit) 11 includes a bottom bracket disposed at the center lower portion of the electric bicycle 1 so as to connect the rear end portion of the main pipe 2 c and the lower end portion of the standing pipe 2 d. The cylindrical hanger 20 (refer also to FIGS. 3 and 4) and the front end of the chain stay 2e are supported in a suspended position via a support bracket 19 or the like arranged to connect the front end of the chain stay 2e. ing. The control unit 11 includes a control board, a storage circuit, a unit case, and the like that control each component (including the electric motor 10) of the electric bicycle 1. Further, a battery 12 is placed above the support bracket 19, and the battery 12 is disposed in a space between the standing pipe 2 d and the rear wheel 4 while being also locked to the standing pipe 2 d. .
　図３～図７に示すように、ハンガ部２０には、クランク軸７ａが横方向（左右の水平方向）に挿通されている。また、図６、図７に示すように、ハンガ部２０の左端部の内側には、クランク軸７ａの左側部分を回転自在に支持する軸受２５が配設されている。ハンガ部２０の右端部には、後述する取付用部材３１やセンサ支持部材３２などを有する人力駆動力検出装置３０が配設され、この人力駆動力検出装置３０が設けられている箇所の内側に、クランク軸７ａの右側部分を回転自在に支持する軸受２６が配設されている。なお、図６などにおける２７Ａ、２７Ｂは、クランク軸７ａにおける軸受２６の位置を規制するＣ字形状のリング体（いわゆるＣリング）である。また、クランク軸７ａにおける人力駆動力検出装置３０が設けられている箇所の右側近傍箇所に、駆動スプロケット１３が取り付けられている。 As shown in FIGS. 3 to 7, a crankshaft 7a is inserted in the hanger portion 20 in the lateral direction (left and right horizontal direction). As shown in FIGS. 6 and 7, a bearing 25 that rotatably supports the left side portion of the crankshaft 7 a is disposed inside the left end portion of the hanger portion 20. At the right end portion of the hanger portion 20, a human power driving force detection device 30 having a mounting member 31 and a sensor support member 32 to be described later is disposed, and inside the portion where the human power driving force detection device 30 is provided. A bearing 26 that rotatably supports the right side portion of the crankshaft 7a is disposed. In addition, 27A and 27B in FIG. 6 etc. are C-shaped ring bodies (what is called a C ring) which regulates the position of the bearing 26 in the crankshaft 7a. In addition, the drive sprocket 13 is attached to a location near the right side of the location where the manual driving force detection device 30 is provided on the crankshaft 7a.
　人力駆動力検出装置３０は、ハンガ部２０から右側方に突出しかつ突出した部分がハンガ部よりも太径の段つき形状に広がった取付用部材３１と、クランク軸７ａの右側部分を回転自在に支持する軸受２６の外周面と取付用部材３１に形成された太径筒部３１ｃの内周面との間に環状に配設されたセンサ支持部材３２と、センサ支持部材３２に形成された弾性変形部３２ａに貼り付けられるなどして取り付けられた歪検出センサ３３と、取付用部材３１の太径部分などを覆って保持する外装部材３６などから構成されている。 The human-power-driving-force detecting device 30 has a mounting member 31 that protrudes to the right from the hanger part 20 and has a protruding part that has a stepped shape with a diameter larger than that of the hanger part, and a right part of the crankshaft 7a. A sensor support member 32 annularly disposed between the outer peripheral surface of the bearing 26 to be supported and the inner peripheral surface of the large-diameter cylindrical portion 31c formed on the mounting member 31, and an elasticity formed on the sensor support member 32. The strain detection sensor 33 is attached by being attached to the deformable portion 32a and the like, and the exterior member 36 that covers and holds the large diameter portion of the attachment member 31 and the like.
　取付用部材３１は、ハンガ部２０の右端部内周に取り付けられる細径筒部３１ａと、この細径筒部３１ａの端部から径方向に広がる拡径側壁部３１ｂと、この拡径側壁部３１ｂより右側方に筒状に延びる太径筒部３１ｃとを有する。また、この実施の形態では、取付用部材３１は、いわゆるセンサケースである第１取付用部材３４と、いわゆるセンサカバーである第２取付用部材３５とから構成されている。そして、第１取付用部材３４に細径筒部３１ａと拡径側壁部３１ｂと太径筒部３１ｃの外周部分（以下、第１取付用部材３４の太径筒部３４ａと称する）とが設けられている。一方、第２取付用部材３５は、取付用部材３１の太径筒部３１ｃの内周部分（以下、第２取付用部材３５の筒状部３５ｄと称する）を有してセンサ支持部材３２を外周から保持するとともに、筒状部３５ｄの右端部から径方向に円板状に延びる側壁覆い部３５ａが形成され、この側壁覆い部３５ａによってセンサ支持部材３２および軸受２６の右側面などを覆っている。 The mounting member 31 includes a small-diameter cylindrical portion 31a that is attached to the inner periphery of the right end portion of the hanger portion 20, a wide-diameter side wall portion 31b that extends radially from the end of the small-diameter cylindrical portion 31a, and this wide-diameter side wall portion 31b. A large-diameter cylindrical portion 31c that extends in a cylindrical shape on the right side. In this embodiment, the mounting member 31 includes a first mounting member 34 that is a so-called sensor case and a second mounting member 35 that is a so-called sensor cover. The first mounting member 34 is provided with a small-diameter cylindrical portion 31a, an enlarged side wall portion 31b, and an outer peripheral portion of the large-diameter cylindrical portion 31c (hereinafter referred to as the large-diameter cylindrical portion 34a of the first mounting member 34). It has been. On the other hand, the second mounting member 35 has an inner peripheral portion of the large-diameter cylindrical portion 31c of the mounting member 31 (hereinafter referred to as a cylindrical portion 35d of the second mounting member 35), and the sensor support member 32. A side wall covering portion 35a that is held from the outer periphery and extends in a disk shape in the radial direction from the right end portion of the cylindrical portion 35d is formed. The side wall covering portion 35a covers the sensor support member 32, the right side surface of the bearing 26, and the like. Yes.
　取付用部材３１（第１取付用部材３４）の細径筒部３１ａの外周面と、これに対応するハンガ部２０の右端部内周面とには互いに螺合するねじ部３４ｄ、２０ａが形成され、取付用部材３１の細径筒部３１ａがハンガ部２０の右端部の内周にねじ込まれることで結合される。また、図８に示すように、ハンガ部２０を貫通して、細径筒部３１ａにねじ込まれる位置決め固定ねじ３７が１箇所に設けられ、ハンガ部２０に取付用部材３１（第１取付用部材３４）が固定された後には、取付用部材３１（第１取付用部材３４）の位置がずれないよう図られている。なお、図７の下半部の人力駆動力検出装置３０などの切断面は、図６に示す場合と同様に、歪検出センサ３３や弾性変形部３２ａがある位置での切断面を示す。一方、図８の下半部の人力駆動力検出装置３０などの切断面は、人力駆動力検出装置３０を真下に伸びるように切断した場合の切断面を示す。つまり、この実施の形態では、ハンガ部２０の真下部分に位置決め固定ねじ３７が設けられている。しかし、位置決め固定ねじ３７の配設位置は、ハンガ部２０の右端部の周方向のどの位置に設けられていてもよい。 Screw portions 34d and 20a that are screwed to each other are formed on the outer peripheral surface of the small-diameter cylindrical portion 31a of the mounting member 31 (first mounting member 34) and the inner peripheral surface of the right end portion of the hanger portion 20 corresponding thereto. The small diameter cylindrical portion 31 a of the mounting member 31 is coupled by being screwed into the inner periphery of the right end portion of the hanger portion 20. Further, as shown in FIG. 8, a positioning fixing screw 37 that penetrates the hanger portion 20 and is screwed into the small-diameter cylindrical portion 31 a is provided at one location, and the mounting member 31 (first mounting member) is provided on the hanger portion 20. 34) is fixed so that the position of the mounting member 31 (first mounting member 34) does not shift. 7 shows a cut surface at a position where the strain detection sensor 33 and the elastic deformation portion 32a are located, as in the case shown in FIG. On the other hand, a cut surface such as the human power driving force detection device 30 in the lower half of FIG. 8 shows a cut surface when the human power driving force detection device 30 is cut so as to extend right below. In other words, in this embodiment, the positioning fixing screw 37 is provided directly under the hanger portion 20. However, the positioning position of the positioning fixing screw 37 may be provided at any position in the circumferential direction of the right end portion of the hanger portion 20.
　図９～図１１に示すように、互いに嵌合する、第１取付用部材３４の太径筒部３４ａの内周面と、第２取付用部材３５の筒状部３５ｄの外周面とには、断面三角形状または断面矩形状などの多数（例えば数十から数百個）の凹凸部３４ｂ、３５ｂが形成されている。そして、予め、ハンガ部２０に第１取付用部材３４を取り付けて固定し、第２取付用部材３５の内側にセンサ支持部材３２を取り付けて固定した状態で、この凹凸部３４ｂ、３５ｂの嵌合位置を変えて、第１取付用部材３４に対する第２取付用部材３５の相対位置を調整することで、センサ支持部材３２のクランク軸７ａに対する周方向の姿勢を調整可能とされている。また、必要に応じて、第１取付用部材３４の太径筒部３４ａの内周面と、第２取付用部材３５の筒状部３５ｄの外周面とにおける、凹凸部３４ｂ、３５ｂが設けられていない箇所に、防水性を高めるためのシール材３８などを配設してもよい。また、第２取付用部材３５の側壁覆い部３５ａの外周面所定箇所には、センサ支持部材３２が所定位置に組みつけられるように、目印部３５ｃが形成されている（詳しくは後述する）。 As shown in FIGS. 9 to 11, the inner peripheral surface of the large-diameter cylindrical portion 34a of the first mounting member 34 and the outer peripheral surface of the cylindrical portion 35d of the second mounting member 35, which are fitted to each other, A large number (for example, several tens to several hundreds) of concave and convex portions 34b and 35b such as a triangular cross section or a rectangular cross section are formed. The first mounting member 34 is attached and fixed to the hanger portion 20 in advance, and the sensor support member 32 is attached and fixed inside the second mounting member 35. By changing the position and adjusting the relative position of the second mounting member 35 with respect to the first mounting member 34, the circumferential posture of the sensor support member 32 with respect to the crankshaft 7a can be adjusted. Further, as required, uneven portions 34b and 35b are provided on the inner peripheral surface of the large-diameter cylindrical portion 34a of the first mounting member 34 and the outer peripheral surface of the cylindrical portion 35d of the second mounting member 35. A sealing material 38 or the like for enhancing waterproofness may be provided at a location that is not. In addition, a mark portion 35c is formed at a predetermined position on the outer peripheral surface of the side wall covering portion 35a of the second mounting member 35 so that the sensor support member 32 is assembled at a predetermined position (details will be described later).
　図９、図１０などに示すように、センサ支持部材３２は、外周の一部が切欠かれた形状とされて周方向に隣接する部分よりも径方向に薄肉となった弾性変形部３２ａを有する。また、この実施の形態では、軸受２６の後部における上寄り部分と下寄り部分と、センサ支持部材３２の内周面の後部における上寄り部分と下寄り部分との間に隙間を有する形状となるように、センサ支持部材３２の内周部にも２つの切欠部３２ｂを形成している。そして、軸受２６の後部とセンサ支持部材３２の後部とにおいて、後部の中央部分だけで、軸受２６とセンサ支持部材３２とが当接して、クランク軸７ａからの力が、弾性変形部３２ａが設けられている箇所に良好に負荷されるよう構成されている。また、センサ支持部材３２の外周面には第２取付用部材３５との位置を決めるための凹溝３２ｃが１箇所に形成されているとともに、これに対応して、第２取付用部材３５の筒状部３５ｄの内周面に、凹溝３２ｃに嵌まり込むリブ３５ｅが１箇所に形成されている。すなわち、第２取付用部材３５のリブ３５ｅにセンサ支持部材３２の凹溝３２ｃが嵌合する状態で、第２取付用部材３５にセンサ支持部材３２を組み付けることにより、第２取付用部材３５に対するセンサ支持部材３２の相対位置が決められる。 As shown in FIGS. 9 and 10, the sensor support member 32 has an elastically deformable portion 32 a having a shape in which a part of the outer periphery is cut out and being thinner in the radial direction than a portion adjacent in the circumferential direction. . Further, in this embodiment, there is a shape having a gap between the upper portion and the lower portion in the rear portion of the bearing 26 and the upper portion and the lower portion in the rear portion of the inner peripheral surface of the sensor support member 32. As described above, the two notches 32 b are also formed in the inner peripheral portion of the sensor support member 32. Then, at the rear part of the bearing 26 and the rear part of the sensor support member 32, the bearing 26 and the sensor support member 32 abut only at the center part of the rear part, and the force from the crankshaft 7a is provided by the elastic deformation part 32a. It is comprised so that it may be favorably loaded to the location currently provided. Further, a concave groove 32c for determining the position with the second mounting member 35 is formed in one place on the outer peripheral surface of the sensor support member 32, and correspondingly, the second mounting member 35 On the inner peripheral surface of the cylindrical portion 35d, a rib 35e that fits into the groove 32c is formed at one location. That is, by assembling the sensor support member 32 to the second mounting member 35 in a state where the concave groove 32c of the sensor support member 32 is fitted to the rib 35e of the second mounting member 35, the second mounting member 35 is attached to the second mounting member 35. The relative position of the sensor support member 32 is determined.
　センサ支持部材３２の弾性変形部３２ａに歪検出センサ３３が貼り付けられるなどして取り付けられている。したがって、歪検出センサ３３は、クランク軸７ａの軸心に平行に沿う線に接する面に沿って配設されている。ここで、歪検出センサ３３が取り付けられている弾性変形部３２ａは周方向に対して他の隣接する部分よりは径方向に薄肉であるものの、センサ支持部材３２全体が、径方向に十分な厚みを有する形状であり、弾性変形部３２ａにおいても十分な厚みを有して、十分な強度を有する。また、センサ支持部材３２の弾性変形部３２ａおよび歪検出センサ３３は、ペダル８にかけられた人力駆動力（踏力）によって駆動スプロケット１３によりチェーン１５を略前方に引張る力の反力によりクランク軸７ａが後方に変形しようとする力を受けて弾性変形する位置に配設されている。具体的には、おおよそクランク軸７ａの後方となる位置に配設されているが、より詳細には、クランク軸７ａに対して少し下方に傾斜した後方となる位置に配設されている。つまり、図１３に示すように、側面視して、駆動スプロケット１３によりチェーン１５の上側部分を前方に引張る方向と平行で、クランク軸７ａの軸心７ｂを通る線Ｈに対して、下方に傾斜角度α（例えば傾斜角度αが約１０～１５度）だけ下方に傾斜する後方位置に配設することがより好ましい。このように配設することで、チェーン１５を略前方に引張る力をより良好に測定できるだけでなく、ペダル８の踏み方などに起因する実際にはチェーン１５の上側部分を引張ることに寄与しない力などの影響を極めて少なく抑えることができる。なお、図１２では理解し易いように、チェーン１５の上側部分を引張る方向が水平である場合を示しているが、これに限るものではなく、一般の電動自転車（自転車）では、後方ほど下がるように傾斜している場合が多い。 The strain detection sensor 33 is attached to the elastic deformation portion 32a of the sensor support member 32, for example. Therefore, the strain detection sensor 33 is disposed along a surface in contact with a line parallel to the axis of the crankshaft 7a. Here, although the elastic deformation portion 32a to which the strain detection sensor 33 is attached is thinner in the radial direction than other adjacent portions in the circumferential direction, the entire sensor support member 32 has a sufficient thickness in the radial direction. The elastic deformation portion 32a also has a sufficient thickness and sufficient strength. Further, the elastic deformation portion 32a of the sensor support member 32 and the strain detection sensor 33 are configured so that the crankshaft 7a is caused by the reaction force of the force that pulls the chain 15 substantially forward by the drive sprocket 13 by the manual driving force (stepping force) applied to the pedal 8. It is disposed at a position where it is elastically deformed by receiving a force to deform backward. Specifically, it is disposed at a position that is approximately behind the crankshaft 7a, but more specifically, is disposed at a position that is inclined slightly downward with respect to the crankshaft 7a. That is, as shown in FIG. 13, when viewed from the side, the drive sprocket 13 is parallel to the direction in which the upper portion of the chain 15 is pulled forward, and is inclined downward with respect to the line H passing through the axis 7b of the crankshaft 7a. More preferably, it is disposed at a rear position inclined downward by an angle α (for example, the inclination angle α is about 10 to 15 degrees). With this arrangement, not only can the force for pulling the chain 15 substantially forward be measured better, but also the force that does not actually contribute to pulling the upper part of the chain 15 due to the way the pedal 8 is depressed. Etc. can be minimized. For ease of understanding, FIG. 12 shows a case in which the direction in which the upper portion of the chain 15 is pulled is horizontal. However, the present invention is not limited to this. It is often inclined to.
　また、この実施の形態では、第２取付用部材３５の側壁覆い部３５ａに形成された目印部３５ｃの線が、チェーン１５における駆動スプロケット１３の上端に接している上側部分の線に対して直交するように記載されている。しかしながら、これに限るものではなく、センサ支持部材３２を組み付けた第２取付用部材３５の位置（姿勢）が認識できるように印が形成されていればよい。 In this embodiment, the line of the mark portion 35 c formed on the side wall covering portion 35 a of the second mounting member 35 is orthogonal to the line of the upper portion of the chain 15 that is in contact with the upper end of the drive sprocket 13. It is described to be. However, the present invention is not limited to this, and a mark may be formed so that the position (posture) of the second mounting member 35 to which the sensor support member 32 is assembled can be recognized.
　また、図６、図７、図９、図１０などにおける３９は、センサ支持部材３２の弾性変形部３２ａに貼り付けられた歪検出センサ３３にその一端部が接続された複数（この実施の形態では３本）の配線部である。これらの配線部３９の他端は、図外の接続コードなどを介して、制御ユニット１１の基板と接続されている。第２取付用部材３５の側壁覆い部３５ａには、配線部３９を通過させる挿通孔３５ｇが形成されている。配線部３９は挿通孔３５ｇを通して、第２取付用部材３５の側壁覆い部３５ａから外側に出された後、径方向外側から外装部材３６の外周部分に沿うように左側に屈曲されて外部に出されている。また、挿通孔３５ｇが設けられている箇所を通して、外部から雨水や埃などが歪検出センサ３３の配設箇所へ浸入しないように、配線カバー４２が取り付けられている。さらに、歪検出センサ３３の配設箇所、すなわち、センサ支持部材３２の弾性変形部３２ａとこれに臨む第１取付用部材３４の太径筒部３４ａおよび拡径側壁部３１ｂと、第２取付用部材３５の筒状部３５ｄおよび側壁覆い部３５ａとで囲まれた空間には、防水用の樹脂４１などが充填され、シールされている。なお、この実施の形態では、配線部３９が第２取付用部材３５の筒状部３５ｄに接触しないように筒状部３５ｄの内面の一部が切欠かれているが、これに限るものではない。 Further, reference numeral 39 in FIGS. 6, 7, 9, 10, etc. denotes a plurality (this embodiment) having one end connected to the strain detection sensor 33 attached to the elastic deformation portion 32a of the sensor support member 32 (this embodiment). In this case, there are three wiring portions. The other ends of these wiring portions 39 are connected to the substrate of the control unit 11 via connection cords or the like not shown. An insertion hole 35g through which the wiring portion 39 passes is formed in the side wall covering portion 35a of the second mounting member 35. The wiring part 39 passes through the insertion hole 35g and exits from the side wall covering part 35a of the second mounting member 35, and then bends to the left from the radially outer side along the outer peripheral part of the exterior member 36 and exits to the outside. Has been. Further, the wiring cover 42 is attached so that rainwater, dust, and the like do not enter the location where the strain detection sensor 33 is provided from the outside through the location where the insertion hole 35g is provided. Further, the location where the strain detection sensor 33 is disposed, that is, the elastically deforming portion 32a of the sensor support member 32, the large-diameter cylindrical portion 34a and the enlarged-diameter side wall portion 31b of the first mounting member 34 facing this, and the second mounting portion. A space surrounded by the cylindrical portion 35d and the side wall covering portion 35a of the member 35 is filled with a waterproof resin 41 or the like and sealed. In this embodiment, a part of the inner surface of the cylindrical portion 35d is cut away so that the wiring portion 39 does not contact the cylindrical portion 35d of the second mounting member 35, but the present invention is not limited to this. .
　さらに、第２取付用部材３５の筒状部３５ｄの３箇所には、第２取付用部材３５に対して、センサ支持部材３２を固定する固定部材としての固定ねじ４３をねじ込むためのねじ孔３５ｆが筒状部３５ｄを貫通して設けられている。ここで、固定ねじ４３は、センサ支持部材３２を外周から周方向にほぼ同様の角度ずつずれた状態で配置され、ねじ込むことで、筒状部３５ｄ内に埋め込まれるようになっている。また、この実施の形態では、１つのねじ孔３５ｆが第２取付用部材３５のリブ３５ｅを貫通して形成されているがこれに限るものではない。 Furthermore, screw holes 35f for screwing fixing screws 43 as fixing members for fixing the sensor support member 32 to the second mounting member 35 are provided at three locations on the cylindrical portion 35d of the second mounting member 35. Is provided through the cylindrical portion 35d. Here, the fixing screw 43 is disposed in a state where the sensor support member 32 is shifted from the outer periphery in the circumferential direction by substantially the same angle, and is screwed to be embedded in the cylindrical portion 35d. In this embodiment, one screw hole 35f is formed through the rib 35e of the second mounting member 35, but the present invention is not limited to this.
　さらに、センサ支持部材３２を固定する前記固定ねじ４３は、センサ支持部材３２への押圧力を調整可能な状態で配設されている。そして、各固定ねじ４３の押圧具合を調整することで、歪検出センサの感度調整も容易に行うことができるよう構成されている。 Furthermore, the fixing screw 43 for fixing the sensor support member 32 is arranged in a state where the pressing force to the sensor support member 32 can be adjusted. And it is comprised so that the sensitivity adjustment of a distortion | strain detection sensor can also be easily performed by adjusting the press condition of each fixing screw 43. FIG.
　また、図１１に示すように、外装部材３６は、第１取付用部材３４の太径筒部３４ａおよび第２取付用部材３５の側壁覆い部３５ａの外周部を覆う筒状部３６ａと、第１取付用部材３４の拡径側壁部３１ｂにおける外周寄り部分を側方から覆う側壁部３６ｂとを有する。また、外装部材３６の太径筒部３４ａの内周面における右側寄り箇所にはねじ部３６ｃが形成されている。そして、第２取付用部材３５の側壁覆い部３５ａの外周にもねじ部３５ｈが形成され、第２取付用部材３５と外装部材３６とが螺合するよう構成されている。一方、図９、図１０などに示すように、第１取付用部材３４の太径筒部３４ａの外周にはねじ部が形成されておらず、第１取付用部材３４と外装部材３６とは螺合しない。ただし、図８、図１１に示すように、外装部材３６には第１取付用部材３４に対して固定するための、外装部材固定部としての固定ねじ４４が１箇所に設けられている。 As shown in FIG. 11, the exterior member 36 includes a cylindrical portion 36a that covers the outer peripheral portion of the large-diameter cylindrical portion 34a of the first mounting member 34 and the side wall covering portion 35a of the second mounting member 35, and The side wall part 36b which covers the outer peripheral part in the diameter-expanded side wall part 31b of the 1 attachment member 34 from the side. In addition, a threaded portion 36c is formed at a position closer to the right side on the inner peripheral surface of the large diameter cylindrical portion 34a of the exterior member 36. A screw portion 35h is also formed on the outer periphery of the side wall covering portion 35a of the second attachment member 35, and the second attachment member 35 and the exterior member 36 are configured to be screwed together. On the other hand, as shown in FIG. 9, FIG. 10, etc., no thread portion is formed on the outer periphery of the large-diameter cylindrical portion 34a of the first mounting member 34, and the first mounting member 34 and the exterior member 36 are Do not screw. However, as shown in FIGS. 8 and 11, the exterior member 36 is provided with a fixing screw 44 as an exterior member fixing portion for fixing to the first attachment member 34 at one location.
　人力駆動力検出装置３０の組み付け作業は以下のようにして行う。まず、外装部材３６をハンガ部２０に挿通させた状態で、第１取付用部材３４のねじ部３４ｄをハンガ部２０のねじ部２０ａにねじ込んで、ハンガ部２０に第１取付用部材３４を取り付ける。さらに、第１取付用部材３４の細径筒部３１ａを貫通する位置決め固定ねじ３７をハンガ部２０のねじ部２０ａにねじ込んで、ハンガ部２０に対する第１取付用部材３４の位置を固定する。 Assembling work of the human power driving force detection device 30 is performed as follows. First, with the exterior member 36 inserted through the hanger part 20, the screw part 34 d of the first attachment member 34 is screwed into the screw part 20 a of the hanger part 20, and the first attachment member 34 is attached to the hanger part 20. . Further, a positioning fixing screw 37 penetrating the small-diameter cylindrical portion 31 a of the first attachment member 34 is screwed into the screw portion 20 a of the hanger portion 20 to fix the position of the first attachment member 34 with respect to the hanger portion 20.
　次に、リング体２７Ａ、２７Ｂを用いて、クランク軸７ａに軸受２６を組み付ける。また、予め弾性変形部３２ａに歪検出センサ３３が取り付けられたセンサ支持部材３２を、このセンサ支持部材３２の凹溝３２ｃが第２取付用部材３５のリブ３５ｅに嵌まり込むように位置合わせして、第２取付用部材３５の筒状部３５ｄの内側にセンサ支持部材３２を嵌め込む。そして、３箇所設けられている固定ねじ４３をねじ込んで、第２取付用部材３５にセンサ支持部材３２を固定するが、この際に、固定ねじ４３の押圧力を調整しながらねじ込むことで、歪検出センサ３３から歪が良好に検出されるように調整する。なお、必要に応じて、シールカバー４０を取り付けた状態で、歪検出センサ３３の回りに防水用などの樹脂４１を充填しておく。 Next, the bearing 26 is assembled to the crankshaft 7a using the ring bodies 27A and 27B. Further, the sensor support member 32 having the strain detection sensor 33 attached to the elastic deformation portion 32a in advance is aligned so that the concave groove 32c of the sensor support member 32 fits into the rib 35e of the second attachment member 35. Then, the sensor support member 32 is fitted inside the cylindrical portion 35d of the second mounting member 35. Then, the fixing screws 43 provided at the three locations are screwed in to fix the sensor support member 32 to the second mounting member 35. At this time, the screw is adjusted by adjusting the pressing force of the fixing screw 43, thereby causing distortion. Adjustment is made so that the distortion is detected well from the detection sensor 33. If necessary, a waterproof resin 41 is filled around the strain detection sensor 33 with the seal cover 40 attached.
　この後、センサ支持部材３２や配線カバー４２が組み付けられた第２取付用部材３５を、ハンガ部２０に固定した第１取付用部材３４に、互いに形成された凹凸部３５ｂ、３４ｂを嵌め合わせながら組み付ける。この際、歪検出センサ３３が適正な位置になるように、第２取付用部材３５の目印部３５ｃが、駆動スプロケット１３の上端に接しているチェーン１５の上側部分に対して直交するような姿勢で、第２取付用部材３５を組み付ける。 Thereafter, the second mounting member 35 to which the sensor support member 32 and the wiring cover 42 are assembled is fitted to the first mounting member 34 fixed to the hanger portion 20 while the concave and convex portions 35b and 34b formed on each other are fitted together. Assemble. At this time, such a posture that the mark portion 35c of the second mounting member 35 is orthogonal to the upper portion of the chain 15 in contact with the upper end of the drive sprocket 13 so that the strain detection sensor 33 is in an appropriate position. Then, the second mounting member 35 is assembled.
　さらに、外装部材３６を、そのねじ部３６ｃが第２取付用部材３５のねじ部３５ｈに螺合するように回転させながら組みつけて、センサ支持部材３２を内装した状態で、第１取付用部材３４と第２取付用部材３５とを密着させる。最後に、外装部材３６の位置決め固定ねじ４４をねじ込んで、外装部材３６の位置も固定する。このようにすることで、歪検出センサ３３を取り付けたセンサ支持部材３２を良好な状態で配設しながら、人力駆動力検出装置３０を良好に組み付けることができる。 Further, the exterior mounting member 36 is assembled while being rotated so that the threaded portion 36c is screwed with the threaded portion 35h of the second mounting member 35, and the sensor support member 32 is housed in the first mounting member. 34 and the second mounting member 35 are brought into close contact with each other. Finally, the positioning fixing screw 44 of the exterior member 36 is screwed to fix the position of the exterior member 36. By doing in this way, the human power driving force detection apparatus 30 can be assembled | attached favorably, arrange | positioning the sensor support member 32 which attached the distortion | strain detection sensor 33 in a favorable state.
　上記構成において、人がペダル８を踏み込むと、この際の踏力による人力駆動力が、クランクアーム７ｂを介してクランク軸７ａおよび駆動スプロケット１３に伝達される。そして、駆動スプロケット１３によりチェーン１５を前方に引張る力に変えられて後輪４の従動スプロケット１４に伝達される。さらに、従動スプロケット１４への力が伝達されて後輪４が回転される。この際に、駆動スプロケット１３によりチェーン１５を前方に引張る力の反力として、駆動スプロケット１３およびクランク軸７ａが後方へ弾性変形しようとし、この力が軸受２５、２６により受けられる。この際、クランク軸７ａにおける駆動スプロケット１３が取り付けられている右側の軸受２６によって、より大きな反力が受けられる。そして、この力により、軸受２６とハンガ部２０との間に配設されているセンサ支持部材３２の後部に形成された弾性変形部３２ａが変形するため、この箇所の変形状態（人力駆動力であるトルク）を歪検出センサ３３により検出することができる。なお、この場合に、上記に述べたように、歪検出センサ３３を、環状のセンサ支持部材３２におけるクランク軸７ａの後方となる位置よりも少し下方に傾斜した後方となる位置に配設することで、ペダル８の踏み方などに起因する、チェーン１５の上側部分を引張ることに寄与しない力などの悪影響を極めて少なく抑えながら、実際に後輪を回転する駆動力となるチェーン１５の上側部分を引張る人力駆動力を良好に測定することができる。 In the above configuration, when a person steps on the pedal 8, the manpower driving force generated by the pedaling force at this time is transmitted to the crankshaft 7a and the drive sprocket 13 via the crank arm 7b. Then, the driving sprocket 13 changes the force to pull the chain 15 forward and transmits it to the driven sprocket 14 of the rear wheel 4. Further, the force to the driven sprocket 14 is transmitted and the rear wheel 4 is rotated. At this time, the drive sprocket 13 and the crankshaft 7a tend to elastically deform backward as a reaction force of the force that pulls the chain 15 forward by the drive sprocket 13, and this force is received by the bearings 25 and 26. At this time, a larger reaction force is received by the right bearing 26 to which the drive sprocket 13 is attached in the crankshaft 7a. This force causes the elastic deformation portion 32a formed at the rear portion of the sensor support member 32 disposed between the bearing 26 and the hanger portion 20 to be deformed. A certain torque) can be detected by the strain detection sensor 33. In this case, as described above, the strain detection sensor 33 is disposed at a position on the rear side of the annular sensor support member 32 that is inclined slightly lower than the position on the rear side of the crankshaft 7a. Thus, the upper portion of the chain 15 that actually acts as the driving force for rotating the rear wheel is reduced while suppressing adverse effects such as the force that does not contribute to pulling the upper portion of the chain 15 due to the way the pedal 8 is depressed. The pulling manpower driving force can be measured well.
　ここで、上記構成によれば、太径筒部３１ｃを有する取付用部材３１（第１取付用部材３４と第２取付用部材３５とからなる）を、ハンガ部２０から側方に突出するように取付け、取付用部材３１の太径筒部３１ｃと軸受２６との間に、歪検出センサ３３を取り付けたセンサ支持部材３２を配設することで、一般の自転車と同様な形状のハンガ部２０を用いながら、非常に簡単な構成で、容易にセンサ支持部材３２を組み付けることができる。 Here, according to the above configuration, the mounting member 31 (consisting of the first mounting member 34 and the second mounting member 35) having the large-diameter cylindrical portion 31 c protrudes laterally from the hanger portion 20. The hanger portion 20 having the same shape as a general bicycle is provided by disposing the sensor support member 32 to which the strain detection sensor 33 is attached between the large diameter cylindrical portion 31c of the attachment member 31 and the bearing 26. The sensor support member 32 can be easily assembled with a very simple configuration while using.
　また、センサ支持部材３２が環状であり、一部に径方向に薄肉となった弾性変形部３２ａを有する極めて簡単な構造である。つまり、特許文献３に開示されているような、外リング１５２ａと内リング１５２ｂとの上端部同士と下端部同士とを接続して、極めて小さな断面積である接続部１５６、１５７に集中するような複雑で強度の低下する部分を有する構造ではない。 Also, the sensor support member 32 has an annular shape, and has an extremely simple structure having an elastically deforming portion 32a that is partially thin in the radial direction. That is, as disclosed in Patent Document 3, the upper ends and the lower ends of the outer ring 152a and the inner ring 152b are connected to each other so as to concentrate on the connecting portions 156 and 157 having an extremely small cross-sectional area. The structure is not complicated and has a portion with reduced strength.
　したがって、環状のセンサ支持部材３２として、弾性変形部３２ａをも含めて比較的厚肉で十分な強度を有するものを容易に用いることができる。これにより、電動自転車１に対して地面などから大きな衝撃を受けた際でも、センサ支持部材３２の測定精度が低下するほど損傷したり、変形したりすることがなく、電動自転車１として良好な信頼性を維持することができる。 Therefore, as the annular sensor support member 32, a relatively thick and sufficient strength including the elastic deformation portion 32a can be easily used. As a result, even when the electric bicycle 1 is subjected to a large impact from the ground or the like, the sensor support member 32 is not damaged or deformed so that the measurement accuracy of the sensor support member 32 is lowered. Sex can be maintained.
　また、上記構成によれば、センサ支持部材３２において径方向に薄肉となった弾性変形部３２ａに歪検出センサ３３を貼り付ける構成であるので、歪検出センサ３３を少ない枚数（１枚または２枚）で済ますことができるとともに、歪検出センサ３３の弾性変形部３２ａへの組付け作業も容易かつ迅速に行える。 Further, according to the above configuration, since the strain detection sensor 33 is attached to the elastic deformation portion 32a that is thin in the radial direction in the sensor support member 32, the number of strain detection sensors 33 is small (one or two). ), And the assembly operation of the strain detection sensor 33 to the elastically deforming portion 32a can be performed easily and quickly.
　また、上記構成によれば、取付用部材３１を、ハンガ部２０に取り付けられ、太径筒部３１ｃの外周部分（太径筒部３４ａ）を有する第１取付用部材３４と、太径筒部３１ｃの内周部分（筒状部３５ｄ）をなしてセンサ支持部材３２を外周から保持する第２取付用部材３５とから構成している。これにより、第１取付用部材３４および第２取付用部材３５に設けられている凹凸部３４ｂ、３５ｂを利用して、歪検出センサ３３が取り付けられたセンサ支持部材３２を、良好な姿勢に調整した状態で取り付けることができる。また、ハンガ部２０の直径寸法が異なっている場合でも、第１取付用部材３４の細径筒部３１ａの形状を変更することで容易に対応できる。また、センサ支持部材３２の直径寸法が変更された場合でも、第２取付用部材３５の筒状部３５ｄの形状を変更することで容易に対応できる。また、第１取付用部材３４の拡径側壁部３１ｂと第２取付用部材３５の側壁覆い部３５ａによりセンサ支持部材３２を両側から良好に保持することもできる。 Moreover, according to the said structure, the attachment member 31 is attached to the hanger part 20, the 1st attachment member 34 which has the outer peripheral part (large diameter cylinder part 34a) of the large diameter cylinder part 31c, and a large diameter cylinder part It comprises a second mounting member 35 that forms the inner peripheral portion (cylinder portion 35d) of 31c and holds the sensor support member 32 from the outer periphery. Thereby, the sensor support member 32 to which the strain detection sensor 33 is attached is adjusted to a good posture by using the uneven portions 34b and 35b provided on the first attachment member 34 and the second attachment member 35. Can be installed in the state. Moreover, even when the diameter dimensions of the hanger part 20 differ, it can respond easily by changing the shape of the small diameter cylindrical part 31a of the member 34 for 1st attachment. Further, even when the diameter dimension of the sensor support member 32 is changed, it can be easily handled by changing the shape of the cylindrical portion 35d of the second attachment member 35. Further, the sensor support member 32 can be favorably held from both sides by the enlarged diameter side wall portion 31 b of the first mounting member 34 and the side wall cover portion 35 a of the second mounting member 35.
　さらに、センサ支持部材３２が取り付けられる取付用部材３１（この実施の形態では第２取付用部材３５）には、センサ支持部材３２に対する組み付け位置を示す位置決め部としてのリブ３５ｅと、チェーン１５に対する組み付け位置を示す目印部３５ｃとが形成されているので、生産上の検査確認工程や、販売後の修理等を行う際でも、適した位置にセンサ支持部材３２を配設できて、良好な信頼性を維持することができる。なお、上記実施の形態では、リブ３５ｅや凹溝３２ｃにより、取付用部材３１（第２取付用部材３５）のセンサ支持部材３２に対する組み付け位置を示す位置決め部を形成したが、突起と窪み部など、相対位置を決めることができるものであればよく、これに限るものではない。 Further, the mounting member 31 (second mounting member 35 in this embodiment) to which the sensor support member 32 is mounted has a rib 35e as a positioning portion indicating the mounting position with respect to the sensor support member 32, and the chain 15 is mounted. Since the mark portion 35c indicating the position is formed, the sensor support member 32 can be disposed at a suitable position even when performing a production inspection check process, repair after sales, or the like, and has good reliability. Can be maintained. In the above-described embodiment, the positioning portion indicating the assembly position of the attachment member 31 (second attachment member 35) with respect to the sensor support member 32 is formed by the rib 35e or the concave groove 32c. However, the present invention is not limited to this as long as the relative position can be determined.
　また、上記構成によれば、センサ支持部材３２を固定する固定部材としての固定ねじ４３を設けるとともにこれらの固定ねじ４３によりセンサ支持部材３２への押圧力を調整可能としたので、これらの固定ねじ４３により、歪検出センサ３３の感度調整も容易に行うことができる。また、別途に感度調整用の部品を設ける場合と比較して、部品点数を削減することができるので、ひいては製造コストを低減することができる。なお、固定部材としての固定ねじ４３を３つ以上設けることにより、歪検出センサ３３を取り付けたセンサ支持部材３２への押圧力を周方向に対して任意に設定することが可能となる。なお、センサ支持部材３２への押圧力を調整可能なものは、２つ以上設けられていればよい。また、固定ねじ４３を４つ以上設けていてもよい。 Further, according to the above configuration, the fixing screws 43 as the fixing members for fixing the sensor support member 32 are provided and the pressing force to the sensor support member 32 can be adjusted by the fixing screws 43. 43, the sensitivity adjustment of the strain detection sensor 33 can be easily performed. In addition, since the number of parts can be reduced as compared with the case where parts for adjusting sensitivity are separately provided, the manufacturing cost can be reduced. In addition, by providing three or more fixing screws 43 as fixing members, it is possible to arbitrarily set the pressing force to the sensor support member 32 to which the strain detection sensor 33 is attached in the circumferential direction. Two or more members that can adjust the pressing force to the sensor support member 32 may be provided. Further, four or more fixing screws 43 may be provided.
　また、上記構成においては、第１取付用部材３４および第２取付用部材３５に外装されて、これらの部材の各凹凸部３４ｂ、３５ｂ同士が嵌合した状態に保持する外装部材３６を設け、この外装部材３６と第２取付用部材３５とを結合する結合部としてのねじ部３６ｃおよびねじ部３５ｈと、外装部材３６を第１取付用部材３４に固定する外装部材固定部としての固定ねじ４４とを設けている。この構成によれば、人力駆動力検出装置３０を完全に組み付けた状態から、固定ねじ４４が緩み、かつ、外装部材３６のねじ部３６ｃが第２取付用部材３５のねじ部３５ｈから外れない限り、第１取付用部材３４と第２取付用部材３５との相対位置がずれて、凹凸部３４ｂ、３５ｂ同士が離脱することはない。すなわち、外装部材３６が第１取付用部材３４および第２取付用部材３５から外れない限り、歪検出センサ３３を取り付けたセンサ支持部材３２の姿勢が変わることによる歪検出センサ３３の不正な出力変動を防止でき、電動自転車として良好な信頼性を維持することができる。 Moreover, in the said structure, the exterior member 36 which is exteriorly covered by the 1st attachment member 34 and the 2nd attachment member 35, and hold | maintains in the state which each uneven | corrugated | grooved part 34b, 35b of these members fitted, A screw portion 36c and a screw portion 35h as a connecting portion for connecting the exterior member 36 and the second attachment member 35, and a fixing screw 44 as an exterior member fixing portion for fixing the exterior member 36 to the first attachment member 34. And are provided. According to this configuration, the fixing screw 44 is loosened and the screw portion 36c of the exterior member 36 is not detached from the screw portion 35h of the second mounting member 35 from the state where the human-power-driving force detection device 30 is completely assembled. The relative positions of the first mounting member 34 and the second mounting member 35 are not shifted, and the concavo- convex portions 34b and 35b are not separated from each other. In other words, unless the exterior member 36 is detached from the first mounting member 34 and the second mounting member 35, unauthorized output fluctuation of the strain detection sensor 33 due to a change in the posture of the sensor support member 32 to which the strain detection sensor 33 is mounted. Can be prevented, and good reliability as an electric bicycle can be maintained.
　また、上記構成においては、歪検出センサが取り付けられているセンサ支持部材３２の弾性変形部３２ａ、つまり、センサ支持部材３２の切欠部分を利用して、歪検出センサ３３に接続された配線部３９を、第２取付用部材３５の側壁覆い部３５ａから引き出している。そして、センサ支持部材３２の切欠部分に相当する箇所に防水用の樹脂４１が注入されて、歪検出センサ３３や歪検出センサ３３の配線部３９との接続部分が外部から侵入した水で濡れたり、埃で汚れたりすることが防止されている。これにより、歪検出センサ３３が良好に保護されて、良好な信頼性を維持することができる。また、一般的なハンガ部２０を用いながら、歪検出センサ３３からの信号を外部に引き出すことができる。 Further, in the above configuration, the wiring portion 39 connected to the strain detection sensor 33 using the elastic deformation portion 32a of the sensor support member 32 to which the strain detection sensor is attached, that is, the cutout portion of the sensor support member 32. Is pulled out from the side wall covering portion 35 a of the second mounting member 35. Then, a waterproof resin 41 is injected into a portion corresponding to the cutout portion of the sensor support member 32, and the connection portion between the strain detection sensor 33 and the wiring portion 39 of the strain detection sensor 33 gets wet with water that has entered from the outside. Prevents dirt and dirt. As a result, the strain detection sensor 33 is well protected and good reliability can be maintained. Further, the signal from the strain detection sensor 33 can be extracted to the outside while using the general hanger 20.
　本発明は、実際に走行する電動自転車に好適に適用できるが、これに限るものではなく、スポーツジムなどに設置される固定されたトレーニング用の電動自転車にも適用することが可能である。 The present invention can be suitably applied to an electric bicycle that actually travels, but is not limited to this, and can also be applied to a fixed electric bicycle for training installed in a sports gym or the like.

Claims (10)

  1. 　ハンガ部から側方に突出しかつ突出した部分がハンガ部よりも太径の段つき形状に広がり、ハンガ部の端部内周に取り付けられる細径筒部と、この細径筒部の端部から径方向に広がる拡径側壁部と、この拡径側壁部より側方に筒状に延びる太径筒部と、を有する取付用部材と、
    クランク軸を回転自在に支持する軸受の外周面と前記取付用部材の太径筒部の内周面との間に環状に配設され、外周の一部が切欠かれた形状とされて周方向に隣接する部分よりも径方向に薄肉となった弾性変形部を有するセンサ支持部材と、
    このセンサ支持部材の弾性変形部に取り付けられた歪検出センサと
    を備えていることを特徴とする電動自転車の人力駆動力検出装置。     A narrow cylindrical part attached to the inner periphery of the end of the hanger part, and a diameter projecting from the end part of the small diameter cylindrical part. A mounting member having an enlarged side wall portion extending in the direction and a large diameter cylindrical portion extending in a cylindrical shape to the side from the enlarged side wall portion;
    It is annularly arranged between the outer peripheral surface of the bearing that rotatably supports the crankshaft and the inner peripheral surface of the large-diameter cylindrical portion of the mounting member, and a part of the outer periphery is cut out in the circumferential direction. A sensor support member having an elastically deformable portion that is thinner in the radial direction than the portion adjacent to
    An apparatus for detecting a human driving force of an electric bicycle, comprising: a strain detection sensor attached to an elastic deformation portion of the sensor support member.
  2. 　人力駆動力検出装置が組みつけられる電動自転車は、後輪を回転駆動させるためのチェーンなどの駆動力伝達体が、クランク軸と一体的に回転する駆動スプロケットなどの人力駆動輪体と、後輪に取り付けられた従動輪体とにわたって架け渡され、ペダルからの踏力による人力駆動力に基づいて補助駆動力を付加可能に構成されており、
    前記弾性変形部は、前記駆動力伝達体を、前記人力駆動力により略前方に引張る力の反力によりクランク軸が後方に変形しようとする力を受けて弾性変形することを特徴とする請求項１記載の電動自転車の人力駆動力検出装置。     The electric bicycle to which the human driving force detection device is assembled has a driving force transmission body such as a chain for rotationally driving the rear wheel, a manpower driving wheel body such as a driving sprocket that rotates integrally with the crankshaft, and a rear wheel. It is constructed so as to be able to add an auxiliary driving force based on the human driving force by the pedaling force from the pedal,
    The elastic deformation portion is elastically deformed by receiving a force that causes the crankshaft to be deformed rearward by a reaction force of a force pulling the driving force transmission body substantially forward by the human driving force. The human-power driving force detection device for an electric bicycle according to 1.
  3. 　センサ支持部材が、センサ支持部材のクランク軸に対する周方向の姿勢を調整可能に取り付けられていることを特徴とする請求項１記載の電動自転車の人力駆動力検出装置。 2. The human-power driving force detection device for an electric bicycle according to claim 1, wherein the sensor support member is attached so as to be capable of adjusting a circumferential posture of the sensor support member with respect to the crankshaft.
  4. 　弾性変形部および歪検出センサが、側面視して、人力駆動輪体により駆動力伝達体を前方に引張る方向と平行でクランク軸の軸心を通る線よりも斜め下方に傾斜した後方位置に配設されていることを特徴とする請求項１記載の電動自転車の人力駆動力検出装置。 When viewed from the side, the elastically deforming part and the strain detection sensor are arranged at a rear position inclined obliquely downward from a line passing through the axis of the crankshaft parallel to the direction in which the driving force transmitting body is pulled forward by the human-powered driving wheel. The human power driving force detecting device for an electric bicycle according to claim 1, wherein the device is provided.
  5. 　前記取付用部材が、細径筒部と拡径側壁部と太径筒部の外周部分とを有する第１取付用部材と、太径筒部の内周部分をなしてセンサ支持部材を外周から保持する第２取付用部材とから構成されていることを特徴とする請求項１記載の電動自転車の人力駆動力検出装置。 The mounting member includes a first mounting member having a thin cylindrical portion, an enlarged side wall portion, and an outer peripheral portion of the large cylindrical portion, and an inner peripheral portion of the large cylindrical portion, and the sensor support member from the outer periphery. 2. The human-power-driving-force detecting device for an electric bicycle according to claim 1, comprising a second mounting member to be held.
  6. 　第１取付用部材と第２取付用部材との互いに嵌合する面に、複数の凹凸部が形成され、この凹凸部の嵌合位置を変えることで、センサ支持部材のクランク軸に対する周方向の姿勢を調整可能とされていることを特徴とする請求項４記載の電動自転車の人力駆動力検出装置。 A plurality of concave and convex portions are formed on the surfaces of the first mounting member and the second mounting member that are fitted to each other. By changing the fitting position of the concave and convex portions, the sensor support member in the circumferential direction with respect to the crankshaft 5. The human-power driving force detection device for an electric bicycle according to claim 4, wherein the posture is adjustable.
  7. 　センサ支持部材が取り付けられる取付用部材に、センサ支持部材に対する組み付け位置を示す位置決め部と、前記駆動力伝達体における人力駆動輪体により引張られる箇所との相対方向を示す目印部とを設けたことを特徴とする請求項１記載の電動自転車の人力駆動力検出装置。 The mounting member to which the sensor support member is attached is provided with a positioning portion that indicates an assembly position with respect to the sensor support member, and a mark portion that indicates a relative direction between the driving force transmitting body and the portion that is pulled by the manpower driven wheel. The human-power driving force detection device for an electric bicycle according to claim 1.
  8. 　センサ支持部材を固定する固定部材が３つ以上設けられ、これらの固定部材のうちの少なくとも２つが、センサ支持部材への押圧力を調整可能な状態で配設されていることを特徴とする請求項１～７の何れか１項に記載の電動自転車の人力駆動力検出装置。 Three or more fixing members for fixing the sensor supporting member are provided, and at least two of these fixing members are arranged in a state in which the pressing force to the sensor supporting member can be adjusted. Item 8. The human power driving force detection device for an electric bicycle according to any one of Items 1 to 7.
  9. 　第１取付用部材および第２取付用部材に外装されて、第１取付用部材と第２取付用部材との各凹凸部同士が嵌合した状態に保持する外装部材を設け、この外装部材と前記第２取付用部材とを結合する結合部と、外装部材を前記第１取付用部材に固定する外装部材固定部とを設けたことを特徴とする請求項６に記載の電動自転車の人力駆動力検出装置。 An exterior member is provided that is sheathed by the first attachment member and the second attachment member, and that holds the concavo-convex portions of the first attachment member and the second attachment member fitted together. The human-powered drive for an electric bicycle according to claim 6, further comprising: a coupling portion that couples the second attachment member; and an exterior member fixing portion that secures the exterior member to the first attachment member. Force detection device.
  10. 　歪検出センサに接続された配線を引き出した状態で、外周の一部が切欠かれた形状部分に相当する箇所に樹脂が注入されて、歪検出センサが防水されていることを特徴とする請求項１～９の何れか１項に記載の電動自転車の人力駆動力検出装置。 The strain detection sensor is waterproofed by injecting a resin into a portion corresponding to a shape part in which a part of the outer periphery is cut out in a state where the wiring connected to the strain detection sensor is pulled out. 10. The human-power driving force detection device for an electric bicycle according to any one of 1 to 9.
PCT/JP2012/005417 2011-09-21 2012-08-29 Human-powered drive force detection apparatus for electric bicycle WO2013042319A1 (en)

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