CN105667697A - Electric power-assisted bike assembly capable of being installed on bike frame - Google Patents

Abstract

The invention provides an electric power-assisted bike and an electric power-assisted bike assembly capable of being installed on a bike frame. By means of the electric power-assisted bike assembly, not only can an auxiliary power mechanism used by the electric power-assisted bike be simplified, but also the electric power-assisted bike assembly can be easily installed on the bike frame. The electric power-assisted bike assembly is characterized in that the assembly comprises the following components of a chain wheel, an electrodynamic force output mechanism, an auxiliary gear, a bolt and a driving shaft which are at least arranged on a common base, wherein the chain wheel is used for transmitting the pedal force to a driving wheel and capable of being rotated; the electrodynamic force output mechanism is used for outputting the electrodynamic force used for assisting the pedal force from an output shaft; the auxiliary gear is connected with the output shaft of the electrodynamic force output mechanism through a gear mechanism; the bolt is used for coaxially connecting the auxiliary gear with the chain wheel; and the driving shaft is contained in a shaft sleeve in a rotating mode by using the pedal force. The shaft sleeve is connected with the common base or integrally formed with the common base.

Description

May be installed the electric assisted bicycle assembly on cycle frame

The divisional application of application for a patent for invention that the application is the applying date, and to be March 28, denomination of invention in 2007 be " electric assisted bicycle and the electric assisted bicycle assembly that may be installed on cycle frame ", application number is 200780052287.0.

Technical field

The present invention relates to a kind of electric assisted bicycle utilizing electric power auxiliary foot legpower and can travelling and the electric assisted bicycle assembly that may be installed on cycle frame.

Background technology

Generally, on the electric assisted bicycle utilizing electric power auxiliary foot legpower and can travel, it is provided with resultant force mechanism pedal force and electric power made a concerted effort. As an example of this resultant force mechanism, develop the electric assisted bicycle with the resultant force mechanism being recorded in (Japan) JP 2002-362468 publication. As shown in Fig. 3 of this publication, this electric assisted bicycle is configured to have: for driving wheel transmit pedal force and the sprocket wheel 2 that can rotate, can and sprocket wheel 2 rotate coaxially equipment gear 30, export the electrodynamic driving assembly corresponding to pedal force under prescribed conditions, utilize the power chain 33 that the electric power of output rotates and the auxiliary chain 32 being hung between equipment gear 30 and power chain 33. There is following advantage in this technology, namely the degree of freedom that arranges of resultant force mechanism expands significantly, does not in fact need special frame.

Patent document 1:(Japan) JP 2002-362468 publication

But, in the resultant force mechanism utilizing above-mentioned prior art, major part and the process auxiliary drive assembly of pedal force sensor become respective construction package, therefore, in the simplification of mechanism and the leeway that there is also improvement in being installed to the easy degree on vehicle frame.

Summary of the invention

The present invention makes in view of above-mentioned problem, it is intended that not only seek the simplification of the auxiliary power mechanism that electric assisted bicycle uses, and can be easily mounted on cycle frame.

In order to solve above-mentioned problem, one embodiment of the present invention provides a kind of electric assisted bicycle utilizing electric power auxiliary foot legpower and can travel, and consists of and has: for transmitting pedal force and the sprocket wheel that can rotate to driving wheel, export electrodynamic electric power output mechanism from output shaft, equipment gear that output shaft via gear mechanism with electric power output mechanism is connected and by the bindiny mechanism that is connected of equipment gear and sprocket coaxiality ground.Being preferably and have elastic component, this elastic component is arranged in the power transfer path of equipment gear, bindiny mechanism and sprocket wheel. Such as, elastic component is arranged at least any one region engaged with the pin in sprocket wheel and equipment gear. One example of bindiny mechanism is pin, this pin through equipment gear in a thickness direction and sprocket wheel and install. Being preferably, equipment gear can be supported by via bearing independently rotatably from sprocket wheel.

According to the present invention, when electric power output mechanism exports the electric power corresponding to pedal force under prescribed conditions, this electric power passes to equipment gear via gear mechanism, makes this equipment gear rotate. The electric power being delivered to equipment gear passes to sprocket wheel via Xiao Deng bindiny mechanism and elastic mechanism. Pedal force and electrodynamic making a concerted effort are passed to driving wheel by sprocket wheel.

The preferred example of gear mechanism has: the first gear linked with the output shaft of electric power output mechanism engages and be used for the second gear slowed down and the 3rd gear being connected coaxially with this second gear and engaging with equipment gear with this first gear.

So, in the present invention, owing to carrying out power transmission from equipment gear to sprocket wheel via pin, therefore, it is possible to reduce number of components and simplify the internal structure of an organization, and the structure being easily mounted on vehicle frame can be easily achieved. Further, since be provided with elastic component in the power transfer path of equipment gear, bindiny mechanism and sprocket wheel, therefore, it is possible to realize power transmission very wellly.

In another optimal way of the present invention, electric power output mechanism and gear mechanism are fixed on common-base, and sprocket wheel and equipment gear can be rotationally mounted on common-base. According to which, it is possible to electric power output mechanism and resultant force mechanism are assembled in an assembly such that it is able to be easily mounted on vehicle frame. It addition, by common-base is processed such that it is able to this assembly is freely installed on any form of vehicle frame.

Be preferably, electric power output mechanism and gear mechanism be contained in the enclosure at least partially, this shell is connected with common-base or formed integrally with this common-base.

It addition, the electric assisted bicycle of another way of the present invention also has the driving axle utilizing pedal force and rotate, this driving axle can be rotatably supported on common-base. In the manner, it is preferred to driving axle to be accommodated in axle sleeve, this axle sleeve is connected with common-base or formed integrally with this common-base. Now, it is preferred on the vehicle frame of electric assisted bicycle, there is the axis hole of through axle sleeve. That is, axle sleeve is formed as being formed through the axis hole on electric assisted bicycle. Thus, by inserting axle sleeve in axis hole, the integral component of electric power output mechanism and resultant force mechanism becomes very easy to the handling of vehicle frame.

And, in the electric assisted bicycle of another mode of the present invention, sprocket wheel is installed on the driving shaft via one-way clutch, and one-way clutch only drives the single direction rotation of the pedal force of axle to be delivered to sprocket wheel by being applicable to. In this approach, it is more preferably, electric assisted bicycle has testing agency and controlling organization, wherein the physical quantity of the one-way clutch that testing agency's detection changes along with pedal force, and controlling organization controls electric power at least based on the physical quantity detected by testing agency. It is thus impossible to can by electric power output mechanism and resultant force mechanism, additionally it is possible to pedal force testing agency is assembled in integral component as entirety with simple mechanism.

On the other hand, equipment gear can be rotationally mounted on common-base preferably via bearing.Thereby, it is possible to stably transmit electric power to sprocket wheel.

The another way of the present invention relates to the electric assisted bicycle assembly that may be installed on cycle frame. This assembly at least arranges on common-base and constitutes such as lower member: sprocket wheel from pedal force to driving wheel that can rotate for transmitting, the equipment gear being connected for the electrodynamic electric power output mechanism of auxiliary foot legpower, the output shaft via gear mechanism with electric power output mechanism from output shaft output, by the bindiny mechanism that is connected of equipment gear and sprocket coaxiality ground.

The another way of the present invention relates to a kind of assembly, it is for being arranged on the electric assisted bicycle assembly on cycle frame, this assembly is characterised by, at least arranges on common-base and constitutes such as lower component: sprocket wheel, and it is for transmitting pedal force to driving wheel and can rotate; Electric power output mechanism, it is used for the electric power of auxiliary foot legpower from output shaft output; Equipment gear, it is connected via the output shaft of gear mechanism with described electric power output mechanism; Bolt, described equipment gear and described sprocket coaxiality are connected by it; Driving axle, it is accommodated in axle sleeve in the way of utilizing described pedal force to rotate; Described axle sleeve is connected with described common-base or formed integrally with this common-base.

Furthermore it is preferred that the through described equipment gear of described bolt through-thickness and described sprocket wheel.

Furthermore it is preferred that described equipment gear can be supported via bearing independently rotatably from described sprocket wheel.

Furthermore it is preferred that described gear mechanism has: the first gear, its output shaft with described electric power output mechanism links; Second gear, it engages with described first gear and is used for slowing down; 3rd gear, it is connected coaxially with described second gear and engages with described equipment gear.

Furthermore it is preferred that described electric power output mechanism and described gear mechanism are fixed on common-base, described sprocket wheel and described equipment gear can be rotationally mounted on described common-base.

Furthermore it is preferred that described electric power output mechanism and described gear mechanism be contained in the enclosure at least partially, this shell is connected with described common-base or formed integrally with this common-base.

Furthermore it is preferred that described assembly has the axis hole through for described axle sleeve.

Furthermore it is preferred that described sprocket wheel is arranged on described driving axle via one-way clutch, described one-way clutch is only delivered to described sprocket wheel the single direction rotation of the pedal force suitable in described driving axle.

Furthermore it is preferred that described assembly has: testing agency, the physical quantity of the described one-way clutch that its detection changes along with described pedal force; Controlling organization, it controls described electric power at least based on the physical quantity utilizing described testing agency to detect.

Preferred embodiment by referring to invention as described below, it is possible to be more clearly understood that objects and advantages of the present invention.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the electric assisted bicycle of the present invention;

Fig. 2 indicates that the schematic diagram of the control system of the electric assisted bicycle of the present invention;

Fig. 3 indicates that the figure of the assembly being arranged on electric assisted bicycle of one embodiment of the invention, and (a) is side view, and (b) is drawing in side sectional elevation;

Fig. 4 is an illustration for the schematic diagram of the step being arranged on cycle frame by the assembly of one embodiment of the invention, a axonometric chart that () is seen from right side when being be installed on cycle frame by this assembly, b () is the enlarged drawing of the assembly shown in Fig. 4 (a), c () is that this assembly is installed to the axonometric chart before cycle frame, axonometric chart when () is that a part for this assembly is inserted into cycle frame d, axonometric chart when () is that this assembly is fixed on cycle frame e, f axonometric chart that () is seen from left side when being be installed on cycle frame by this assembly,

Fig. 5 is the exploded perspective view of the one-way clutch shown in Fig. 3;

Fig. 6 illustrates that the pedal force Cleaning Principle of the electric assisted bicycle of the present invention represents the tooth of one-way clutch (ratchet) and the figure of the chimerism of pawl;

Fig. 7 indicates that the figure preventing claw relative to the example preventing rotating mechanism rotated against driving axle, a () indicates that the top view of the general configuration of ball spline, b () indicates that the top view of the general configuration of spline, (c) indicates that the top view of the general configuration of keyway.

Description of reference numerals

1 electric assisted bicycle

2 sprocket wheels

4 drive axle

11 assemblies

12 chains

13 cover of drivers

14 microcomputers

15 amplifying circuits

17 accumulator

22 driving wheels (trailing wheel)

30 equipment gears

37 electro-motors

The output shaft of 37a electro-motor

38 first gears

40 gear mechanisms

42 second gears

45 the 3rd gears

50 common-bases

52 axle sleeves

70 bearings

80 axis holes

99 one-way clutch

100 claws

102 ratchet pawls

112 teeth portion

114 hook tooths

123 pins

124 disk springs

126 strain gauges

129 elastic components

Detailed description of the invention

Below, it is described with reference to the preferred embodiments of the present invention.

Fig. 1 indicates that the schematic diagram of the electric assisted bicycle 1 of first embodiment of the invention. As shown in the drawing, the main skeleton part of this electric assisted bicycle 1 is identical with ordinary bicycle, is made up of the vehicle frame 3 of metal control, is provided with front-wheel 20, trailing wheel 22, handle 16 and vehicle seat 18 etc. on this vehicle frame 3 in a well-known manner.

It addition, drive the rotatable earth's axis of axle 4 to be bearing in the central lower of vehicle frame 3, pedal 8L, 8R are separately mounted to both ends around via toggle-action lever 6L, 6R. On this driving axle 4, having sprocket wheel 2 via one-way clutch (the 99 of Fig. 3 (b) described later) is axially mounted on, this one-way clutch is equivalent to the rotation in the R direction of car body direction of advance for only transmission. Between this sprocket wheel 2 and the rear-wheels power mechanism 10 of the central part being located at trailing wheel 22, it is provided with the chain 12 of cycle rotation.

The electric assisted bicycle 1 of the present embodiment is controlled at least through the assist ratio (auxiliary power/pedal force) determined by car body travel speed and pedal force with auxiliary foot legpower. In the present embodiment, the assembly 11 as auxiliary power mechanism the control of electric assisted bicycle and the action of making a concerted effort of electric power and pedal force are carried out.

The general configuration of the control system of electric assisted bicycle 1 is shown in Figure 2. The control system of the electric assisted bicycle 1 of the present embodiment, including: the microcomputer 14 controlling the overall electron process of this bicycle in the lump, the electro-motor 37 that can carry out PWM control, is directly connected with microcomputer 14 and amplifies the amplifying circuit 15 of power of its control signal and be connected and supply to electro-motor 37 accumulator 17 of power supply with this amplifying circuit 15.

In microcomputer 14, at least input is used for calculating the tach signal of travel speed and for calculating the strain gauge signal 1,2 of pedal force. Will be described later about the mechanism producing these signals. Microcomputer 14 calculates travel speed and pedal force from these input signals, and is determined the electron process of assist ratio based on the algorithm specified. Then, microcomputer 14 sends instruction to produce the auxiliary power of the assist ratio corresponding to determining to electro-motor 37, is therefore sequentially output the PWM instruction corresponding to this auxiliary power.

Then, utilize Fig. 3 (a) and (b) illustrates in electric assisted bicycle 1 assembly 11 as auxiliary power mechanism.

Fig. 3 (a) and the assembly 11 shown in (b) have equipment gear 30, electro-motor 37 and gear mechanism 40, this equipment gear 30 is connected coaxially with sprocket wheel 2, this electro-motor 37 exports electric power, and this gear mechanism 40 is for being delivered to equipment gear 30 by electric power from the output shaft 37a of this electro-motor via gear. Therefore, when electro-motor 37 rotates, its moment of torsion provides equipment gear 30 via gear mechanism 40, and is directly delivered to sprocket wheel 2 that is fixing relative to this equipment gear 30 and that utilize pedal force to rotate. Hereby it is achieved that the making a concerted effort of auxiliary power and pedal force.

Gear mechanism 40 has the first gear 38 linked of the output shaft 37a with electro-motor 37 and engages with this first gear 38 and for the second gear 42 slowed down and the 3rd gear 45 being connected coaxially with this second gear 42 and engaging with equipment gear 30.

It addition, be provided with so-called one-way clutch (not shown), this clutch only unidirectional delivery power in the midway of the bang path transmitting auxiliary power from electro-motor 37 to equipment gear 30. This one-way clutch constitutes and connects into and transmitted to equipment gear 30 by the auxiliary power from electro-motor 37, but, namely do not transmit moment of torsion from equipment gear 30 to electro-motor 37 in its opposite direction. When electro-motor 37 does not rotate, utilizing not shown above-mentioned one-way clutch, it is possible to operate swimmingly, now the rotary load of motor is not transferred to equipment gear 30.

Sprocket wheel 2, equipment gear 30, electro-motor 37 and gear mechanism 40 are arranged on common-base 50. It addition, electro-motor 37 and gear mechanism 49 are integrally attached to not move on common-base 50. And, electro-motor 37 and the first gear 38 in gear mechanism 40 and the second gear 42 are covered by cover of driver 13. This cover of driver 13 is connected with common-base 50 or is integrally formed with this common-base 50.

Driving on axle 4, sprocket wheel 2 is rotatably installed on common-base 50 via one-way clutch 99. As described later, one-way clutch 99 is only applicable to drive the rotation of the direction of advance of axle 4 to sprocket wheel 2 transmission. Driving axle 4 rotatably to be supported by axle in axle sleeve 52, this axle sleeve 52 is fixed on this vehicle frame with the state being inserted in the axis hole 80 being formed at vehicle frame. Axle sleeve 52 is connected with common-base 50 or is integrally formed with common-base 50.

Sprocket wheel 2 and equipment gear 30 connect coaxially via pin 123 (being disposed on three places with 120 degree in the example of Fig. 3 (a)). Thus, the electric power being delivered to equipment gear 30 is delivered to sprocket wheel 2 via pin 123. As shown in Fig. 3 (b), the through equipment gear 30 of pin 123 through-thickness and sprocket wheel 2 and install. In the example of Fig. 3 (b), the foot of pin 123 is inserted into the hole portion of equipment gear 30 and is fixed, and the head of pin 123 is formed through in the hole of sprocket wheel 2, for preventing the front end of the pin 123 come off to have the diameter more than this bore dia.

It addition, the elastic components such as rubber 129 are arranged on around head and the axle portion of pin 123. That is, elastic component is arranged on the engaging region between sprocket wheel 2 and pin 123. Thus, absorb rocking of equipment gear 30 and sprocket wheel 2, it is possible between equipment gear 30 and sprocket wheel 2, transmit power very wellly.

It addition, the bindiny mechanism between sprocket wheel 2 and equipment gear 30 is not limited to the pin of diagram. For example, it may be bolt, or can also be that the foot of pin 123 is formed on equipment gear 30.It addition, elastic component 129 can also be arranged in the arbitrary power transfer path of equipment gear 30, pin 123 and sprocket wheel 2. For example, it is also possible to individually or additionally be arranged on the engaging region etc. between equipment gear 30 and pin 123.

It addition, equipment gear 30 and sprocket wheel 2 are rotatably installed on common-base 50 via bearing 70 independently. Thereby, it is possible to more stably transmit power from equipment gear 30 to sprocket wheel 2.

As mentioned above, in the present embodiment, sprocket wheel 2, equipment gear 30, electro-motor 37, gear mechanism 40 and driving axle 4 are arranged on common-base 50, and, the circuit of control system as shown in Figure 2 and pedal force sensor described later are separately mounted to cover of driver 13 and one-way clutch 99 is internal, thereby, it is possible to constitute the assembly 11 assembling electric boosted required whole elements. Thus, the simplification that auxiliary power mechanism is overall can not only be realized, and, it is possible to assembly 11 is easily mounted on vehicle frame. Further, it can be appreciated that for by common-base is suitably processed, it is possible to this assembly 11 is installed on any form of vehicle frame.

Utilize Fig. 4 that the step being installed on cycle frame by the assembly 11 of one embodiment of the invention is described. The axonometric chart seen from right side when assembly 11 being installed on cycle frame shown in Fig. 4 (a), at the enlarged drawing of the assembly 11 shown in Fig. 4 (a), the axonometric chart seen from left side when assembly 11 being installed on cycle frame shown in Fig. 4 (f) shown in Fig. 4 (b).

First, as shown in Fig. 4 (c), from the one end of axis hole 80, the driving axle 4 (being covered by axle sleeve 52) of plug-in package 11 in the direction of the arrow. Then, as shown in Fig. 4 (d), from the end plug-in package 11 of the opposition side of axis hole 80 until driving the front end of axle 4 and axle sleeve 52 to highlight, metalwork 82 and fastening metal part 84 are installed in its prominent front end. And, assembly 11 arranges screw threaded hole and is formed at the protrusion at both ends, vehicle frame is arranged and is respectively formed with bolt hole and a pair tab (タ Block) extended parallel to, in the operation of Fig. 4 (b), it is possible to configure this protrusion with the state of bolt hole proper alignment between this pair tab.

Finally, as shown in Fig. 4 (c), fastening metal part 84 is fastened on the leading section driving axle 4 and axle sleeve 52 and they are fixed, and, in the outside of assembly 11, fix the leading section installing metalwork 82 utilizing fastening metal part 84 simultaneously to fasten with bolt. It addition, in the screw threaded hole of the protrusion being configured in a pair tab, fasten bolt from both ends. As mentioned above, it is possible to reliably and simply by assembly 11 be arranged on vehicle frame.

(pedal force testing agency)

Utilizing Fig. 3 to Fig. 7 that the pedal force testing agency of output strain gauge signal 1,2 is described, this strain gauge signal 1,2 is input in microcomputer 14. The strain changed along with the deformation of one-way clutch 99 detects in the pedal force testing agency of the present embodiment, and the deformation of this single file clutch 99 is corresponding to pedal force.

As shown in Fig. 3 (b), sprocket wheel 2 supports via one-way clutch 99 driven shaft 4 axle. As it is shown in figure 5, this one-way clutch 99 has claw (portion) 100 and teeth portion 112.

In claw 100, three ratchet pawls 102 are arranged on its second snap-latch surface 110 circumferentially equiangularly spacedly. This ratchet pawl 102 is made up of rigid body, can rotate around the approximately radial axle along the second snap-latch surface 110. When non-active force on ratchet pawl 102, ratchet pawl 102 to be promoted spring (on vertical Chi げ ス プ リ Application グ) 104 forces by pawl in the way of its length direction and the second snap-latch surface 110 are constituted predetermined angular (the balance direction 160 of Fig. 6).As shown in Figure 6, when ratchet pawl 102 ramps up direction a or descent direction b deviation from balance direction 160, pawl promotes spring 104 makes only small elastic force act on ratchet pawl 102, in order to is deviateed and returns to balance direction 160.

It addition, the central part at claw 100 is formed for receiving the claw hole 106 driving axle 4, this claw hole 106 is the through cylindrical portion 103 prominent from the back side 101 of claw 100 also. Overleaf 101, round shape groove 155 (Fig. 3 (b)) is formed on the excircle of cylindrical portion 103, is rotatably embedded with multiple steel ball 152 in this round shape groove 155. Thus, 101 it is formed and bears axial load and double as the bearing of sliding bearing overleaf.

Disk spring 124 central hole 127 wherein is passed cylindrical portion 103 and abuts with the back side 101 of claw 100. Now, disk spring 124 with elastic force resistance from the direction of claw 100 pressure, via steel ball 152 namely bear load-carrying bearing slidably with back face. On the surface of disk spring 124, two positions relative with 180 degree of position relationships are provided with strain gauge 126. The two strain gauge 126 electrically connects with microcomputer 14 via lead-in wire 128. It is more preferably, it is also possible to the strain gauge of more than three is set on disk spring 124. Now, it is preferable that be set to multiple strain gauges on the surface of disk spring 124, lay respectively at rotational symmetric position.

Disk spring 124 is accommodated in the inner bottom part 132 of bowl-shape supporter 130. On supporter 130, it is formed with the support holes 133 for through driving axle 4 and supporting cylinder portion 134 prominent from behind. Cutting screw thread on the outer surface in supporting cylinder portion 134, by it being screwed togather with the screw cutting inwall of car body installation portion 145, thus, supporter 130 is fixed on car body. On the inwall in this supporting cylinder portion 134, engaging has tackles the bearing 138 (with reference to Fig. 3 (b)) from axially and radially both direction load-carrying, and bearing 130 is locked by being formed at the stop inclined-plane 144 driving axle 4. Similarly, owing to being also provided with bearing 139 (with reference to Fig. 4 (b)) in the opposition side driving axle 4, therefore, axle 4 is driven to rotate freely relative to car body.

On the inwall in claw hole 106, be formed with 5 extensions vertically at four positions first prevents rotation groove 108. At the outer wall section that drive axle 4 sliding with the inwall in claw hole 106, being also formed with second at four positions and prevent rotation groove 140, this second prevents rotation groove 140 from 5 extending vertically in the way of preventing rotation groove 108 relative with first. As shown in Fig. 7 (a), first prevents rotation groove 108 and the second cylinder groove preventing rotation groove 140 formation from axially extending corresponding thereto, receives multiple steel ball 150 to fill these cylinder grooves in each cylinder groove. Thus, claw 100 can move with minimized friction resistance vertically, and prevents rotating against of relative drive shaft 4. Above-mentioned rotating mechanism is prevented to be configured to a kind of ball spline, but as the ball spline etc. of this ball spline slidably preventing rotating mechanism also to be able to be suitable for other forms such as circulation rotating.

It addition, as claw 100 being installed to the method driven on axle 4, it would however also be possible to employ the mechanism except the ball spline of Fig. 7 (a). Such as, as shown in Fig. 7 (b), as preventing rotating mechanism also applicable key/spline (キ ス プ ラ イ Application) form, so-called key/spline form, refer to and axle 4 arranges the jut 140a axially extended driving, and on claw 100, form the 3rd of storage this jut 140a prevent rotation groove 108a.It addition, in Fig. 7 (b), it is possible to jut 140a is set in claw 100 side, prevents rotation groove 108a driving axle 4 side to arrange the 3rd. And, as shown in Fig. 7 (c), keyway type can also be suitable for as preventing rotating mechanism, so-called keyway type, refer to claw 100 and driving axle 4 is respectively provided with the axially extend the 4th prevent rotation groove 108b and corresponding thereto the 5th prevent rotation groove 140b, the rectangular-shaped groove forming these grooves is received keypad (キ プ レ ト).

On the first snap-latch surface 121 of teeth portion 112, it is formed with the multiple hook tooths 114 for engaging with ratchet pawl 102. Hook tooth 114 is made up of the inclined-plane 118 steeper relative to the first snap-latch surface 121 and milder inclined-plane 116, and wherein, inclined-plane 118 and inclined-plane 116 are different from each other along the circumference of teeth portion and in periodically forming.

Teeth portion 112 can slip ground axle suspension on driving axle 4 via the axle collar 111 in the way of its first snap-latch surface 121 is relative with the second snap-latch surface 110 of claw 100. Now, ratchet pawl 102 and hook tooth 112 engage (Fig. 6). That is, drive axle 4 only via the snap portions of ratchet pawl 102 and hook tooth 112, be movably connected with teeth portion 112. Having packing ring 122 via the axle collar 111 by chimeric on the end 142 driving axle 4 in teeth portion hole 120, this packing ring 122 makes teeth portion 112 not to axially external disengaging (Fig. 3 (b)). Sprocket wheel 2 does not removably mount within teeth portion 112 via pin 123 (Fig. 3 (b)), and, pedal shaft 146 is arranged on the front end driving axle 4. Thus, the hook tooth that axle 4 and sprocket wheel 2 will be driven to connect is completed, to be configured to only the rotation utilizing pedal force of car body direction of advance be passed to sprocket wheel 2.

Being preferably, skew spring 136 is arranged between stop inclined-plane 144 and the back side 101 of claw 100 driving axle 4. When pedal force is below setting (such as, time in fact close to zero), this skew spring 136 makes claw 100 be axially offset from, to be accommodated between the steel ball 152 at the back side 101 and disk spring 124 and to produce gap.

Then, the effect of this pedal force testing agency is described.

When pedal 8R, 8L (Fig. 1) are applied pedal force by passenger, make driving axle 4 to car body direction of advance rotate time, this revolving force be delivered to relative drive shaft 3 can not rotate and slidably driven shaft 3 axle supporting claw 100. Now, as shown in Figure 6, owing to ratchet pawl 102 is subject to the power Fd corresponding to pedal force from claw 100, therefore its leading section is connected on the steeper inclined-plane 118 of the hook tooth of teeth portion 112, transmits that force to hook tooth. Owing to ratchet teeth portion 112 and sprocket wheel 2 link together, therefore, the leading section of ratchet pawl 102 is subject to from steeper inclined-plane 118 by the power Fp of the load generation for driving. It is subject to the ratchet pawl 102 of power Fp and the Fd in direction opposite each other from its both ends, rotates along a direction and erect. Now, because ratchet pawl 102 erects, claw 100 moves to axially inner side, and extrudes the disk spring 124 being installed between claw 100 and supporter 130. Disk spring 124 is revolted this extruding and elastic force Fr is acted on claw 100. At short notice, the power of the pedal force that this power Fr and reflection are axially moveable claw 100 reaches balance. Thus, gap between the ess-strain of disk spring 124, claw 100 and teeth portion 112, ratchet pawl 102 become the physical quantity of reflection pedal force relative to the angle of the second snap-latch surface 110, claw 100 relative to the position of vehicle frame and the pressure etc. of extruding disk spring 124.Therefore, by detect therein at least one such that it is able to speculate pedal force T.

In the present embodiment, as an example, the ess-strain of detection disk spring 124. Microcomputer 14 is by from being located at the signal of two strain gauges 126 of disk spring 124 at least for addition calculation (including average computation). So, measured by the ess-strain amount equalization by multiple positions, even if identical pedal force, it is also possible to increase exporting change and make interference component smooth, therefore, it is possible to improve SN ratio, improving pedal force further and speculate precision. The quantity of strain gauge is more many, then this effect is more big.

It addition, be when below setting at pedal force, owing to skew spring 136 makes generation gap between the back side 101 of claw 100 and disk spring 124, therefore steel ball 152 reduces with the situation of disk spring 124 collision continually. Therefore, it is possible to reduce the interference component of strain gauge signal, improve the stability of pedal force detection and electric boosted control.

Then, microcomputer 14 calculates the auxiliary power Te of the auxiliary that should apply at least based on the pedal force T calculated, and calculates output and send the control signal of instruction to electro-motor 37, to utilize this auxiliary power to rotate driving. Be preferably, speed probe 220 tach signal detected is converted to speed by microcomputer 14, determines suitable auxiliary power Te based on pedal force T and speed the two key element, and controls electro-motor 37 to produce this auxiliary power Te.

The pedal force testing agency of the present embodiment has more excellent effect as described below.

(1) owing to utilizing a mechanism to achieve one-way clutch and pedal force testing agency, therefore, it is possible to seek to reduce number of components, it may be achieved miniaturization, lightweight and cost degradation.

(2) part owing to pedal force is detected, adopt and will bear load-carrying assembly and the load-carrying detection disk spring that is integrally formed of sensor, an assembly is utilized to achieve two functions, therefore except the effect above, it is possible to realize further miniaturization, lightweight and cost degradation.

(3) shown in and (2) such as above-mentioned (1) with higher level, the miniaturization of pedal force testing agency, lightweight and simplification are realized, therefore, even general bicycle, the probability of installation foot legpower testing agency also improves further.

(4) according to reason as shown in above-mentioned (1) and (2), it is possible to realize the auxiliary sense that the transmission loss of load-carrying reduces compared with existing mechanism and the response that controls is good.

(5) according to the reason as shown in above-mentioned (1) and (2), compared with existing mechanism (use helical spring), pedal is absent from useless movement (before sensor senses), for relative to when trampling there is elastic sensation in existing mechanism, in the present embodiment during pushes pedals sensation with trample general bicycle pedal time feel identical.

It addition, be arranged on sprocket wheel for any one in the pawl of one-way clutch 99 and tooth, and another installs situation on the driving shaft, it is possible to be modified to any appropriate. For example, it is possible to be configured in upper mounting jaw portion, sprocket wheel side 100, driving, axle 4 slidably and not installed teeth portion 112 revolvably, and utilize teeth portion 112 to extrude disk spring 124.

It addition, in the above example, detect the ess-strain of disk spring as the physical quantity relevant to pedal force, but the invention is not restricted to this, it is possible to detect the random physical quantity changed according to the deformation corresponding to pedal force of one-way clutch 99.Such as, as the physical quantity of reflection pedal force, it is possible to select the pressure etc. of the gradient of ratchet pawl, ratchet claw and the relative spacing of ratchet teeth portion, the position of ratchet claw car body relative to any one in ratchet teeth portion and extruding disk spring.

And, the elastomer configured for revolting the deformation of one-way clutch 99, it is also possible to any appropriate ground changes its kind and shape thereof. Except disk spring, helical spring, it is also possible to utilize such as rubber elastomer etc. It addition, as the mechanism of detection ess-strain, illustrate strain gauge, but, as long as the physical quantity relevant to ess-strain can be detected, it is not limited to this.

It is above embodiments of the invention, but, the invention is not limited in above-mentioned example, can be modified to any appropriate in the main scope of the present invention.

Claims (9)

1. an assembly, it is the electric assisted bicycle assembly that can be arranged on cycle frame, and this assembly is characterised by,

At least arrange on common-base and constitute such as lower component:

Sprocket wheel, it is for transmitting pedal force to driving wheel and can rotate;

Electric power output mechanism, it is used for the electric power of auxiliary foot legpower from output shaft output;

Equipment gear, it is connected via the output shaft of gear mechanism with described electric power output mechanism;

Bolt, described equipment gear and described sprocket coaxiality are connected by it;

Driving axle, it is accommodated in axle sleeve in the way of utilizing described pedal force to rotate;

Described axle sleeve is connected with described common-base or formed integrally with this common-base.

2. assembly as claimed in claim 1, it is characterised in that

The through described equipment gear of described bolt through-thickness and described sprocket wheel.

3. assembly as claimed in claim 1, it is characterised in that

Described equipment gear can be supported via bearing independently rotatably from described sprocket wheel.

4. assembly as claimed in claim 1, it is characterised in that

Described gear mechanism has:

First gear, its output shaft with described electric power output mechanism links;

Second gear, it engages with described first gear and is used for slowing down;

3rd gear, it is connected coaxially with described second gear and engages with described equipment gear.

5. assembly as claimed in claim 1, it is characterised in that

Described electric power output mechanism and described gear mechanism are fixed on common-base,

Described sprocket wheel and described equipment gear can be rotationally mounted on described common-base.

6. assembly as claimed in claim 5, it is characterised in that

Described electric power output mechanism and described gear mechanism be contained in the enclosure at least partially, this shell is connected with described common-base or formed integrally with this common-base.

7. assembly as claimed in claim 1, it is characterised in that

There is the axis hole through for described axle sleeve.

8. assembly as claimed in claim 1, it is characterised in that

Described sprocket wheel is arranged on described driving axle via one-way clutch, and described one-way clutch is only delivered to described sprocket wheel the single direction rotation of the pedal force suitable in described driving axle.

9. assembly as claimed in claim 8, it is characterised in that have:

Testing agency, the physical quantity of the described one-way clutch that its detection changes along with described pedal force;

Controlling organization, it controls described electric power at least based on the physical quantity utilizing described testing agency to detect.