JP2003054481A - Bicycle with driving unit and unit mounting bracket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and accurately mount a driving unit on an ordinary bicycle frame by eliminating difficulty of adjustment of a mounting position. SOLUTION: A unit mounting bracket 70 includes a bottom part plate 71 and a pair of side part plates 72R, 72L arranged in roughly parallel and roughly vertically extending from a pair of side edges 81R, 81L opposing to the bottom part plate 71 as a base end and provided with side part holes 84R, 84L which a drive shaft can pass through. A reinforcement rib 76, a bend part 79 and dent sections 77R, 77L are formed. The unit mounting bracket 70 is fixed on a support part 145 under a condition that the drive shaft 4 passes through a pair of the side part holes 84R, 84L and that the support part 145 is put between a pair of the side part plates 72R, 72L and the driving unit for a power- assisted bicycle is mounted on the bottom part plate 71 with bolts inserted through mounting holes 74, 75.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive unit-equipped bicycle including a drive unit capable of outputting electric power, and a unit mounting bracket for mounting the drive unit on a bicycle body. More specifically, the drive unit-equipped bicycle is equipped with a drive unit with such a unit mounting bracket, and is capable of traveling by assisting pedaling force with electric force and traveling by both pedaling force and electric force. About electric bicycles.

[0002]

2. Description of the Related Art Generally, an electrically assisted bicycle which is capable of traveling by assisting pedaling force by electric force includes a drive unit having an electric motor, a reduction gear and the like housed in a housing, and a combination mechanism of the electric force and the pedaling force. It is provided. Usually, the drive unit is precisely adjusted in position with respect to the resultant mechanism so that the electric force is accurately applied to the pedaling force, and is mounted so as not to move with respect to the body frame. In addition, when mounting on the vehicle body frame, it is necessary to carefully mount so that the drive unit does not interfere with the rigid frame and the position of the gear inside the unit does not shift. In order to satisfy such conditions, in the past, a dedicated body frame was made,
Some of them have been specially processed, but there is a problem that the cost will increase in the future without making use of the normal frame manufacturing process. Also, when the drive unit is installed without modifying the frame, the drive unit itself and the metal fittings for mounting the unit on the frame tend to be complicated, and even in this case, avoiding difficult positioning. I couldn't do it.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above facts, and makes it possible to easily and accurately attach a drive unit to an ordinary bicycle frame without the difficulty of adjusting the attachment position. An object of the present invention is to provide a unit mounting bracket, an electric assist bicycle to which a drive unit is attached by such a unit mounting bracket, and an electric bicycle.

[0004]

In order to solve the above problems, a bicycle with a drive unit including a drive unit capable of outputting electric power according to the present invention has a drive shaft that rotates by pedaling force and a drive shaft that is pivotally supported. A unit mounting bracket having a support portion and a pair of side plates for fixing the drive unit to the vehicle body and a bottom plate connected to the pair of side plates, and an electric force output from the drive unit to drive wheels. And a transmission means for transmitting the drive shaft to the drive shaft, wherein the unit mounting bracket has the drive shaft passing through the pair of side plates and the support portion being sandwiched between the pair of side plates. The drive unit is fixed to the support portion, and the drive unit is attached to the bottom plate to fix the drive unit to the vehicle body.

According to the present invention, when the drive unit is attached to the bicycle through the unit mounting bracket, the bottom plate to which the drive unit is attached is rotatably held around the side plate through which the drive shaft passes. You can In this case, the unit mounting bracket is tightened inward in the axial direction of the drive shaft with the drive shaft passing through the pair of side plates and the support portion being sandwiched between the pair of side plates. , Is preferably fixed to the support portion.

Thus, an accurate unit mounting position is automatically determined without adjusting the mounting position. In particular, when the resultant force means has a severe positioning like the double chain method, the drive unit mounting method according to the present invention is particularly effective. In this case, the bicycle with the drive unit is equipped with a rotatable main sprocket for transmitting the rotational force of the drive shaft to the drive wheels, and the double-chain type coupling means is a sub-sprocket that is coaxially rotatable with the main sprocket. , A power sprocket rotated by the electric power output from the drive unit, and an auxiliary chain stretched between the auxiliary sprocket and the power sprocket. Coupled with the flexibility of the mounting position of the drive unit by the double chain system, the mounting position adjustment effect of the unit mounting bracket according to the present invention,
The drive unit can be attached at an accurate position regardless of the frame.

[0007] The unit mounting bracket preferably further comprises a sliding means capable of unidirectionally sliding the attached drive unit along the bottom plate. By sliding the drive unit by the sliding means, the tension of the auxiliary chain can be easily adjusted at the time of assembly adjustment and at the time of expansion and contraction due to secular change. The sliding means can be realized by guide means for guiding the drive unit so that it does not deviate from one direction when sliding, and moving means capable of moving and adjusting the drive unit along the one direction.

Further, the bottom plate preferably includes a frame mounting means for fixing an end portion of the bottom plate to the vehicle body frame. Frame attachment means 1
Aspect includes band means for tightening the vehicle body frame, and connecting means for connecting the band means to the bottom plate. More preferably, the bottom plate comprises a pushing means for exerting a pushing force on the body frame at the end provided with the frame mounting means. One aspect of the push-down means is at least two push-screws that are screwed out of the central axis of the bottom plate.

[0009] In the double chain type force producing means, the torque is transmitted from the electric motor to the main sprocket on the transmission path of the electric force from the electric motor in the drive unit to the main sprocket, but vice versa. It is preferable to intervene one-way clutch means configured and arranged so as not to transmit torque in the direction. Also, the output shaft that outputs electric power from the drive unit protrudes, and the power sprocket
It is directly connected to the output shaft.

According to the present invention, the drive unit can be flexibly attached to various frames while preventing interference between the frame and the drive unit. Normally, a drive shaft and a supporting portion supporting the drive shaft are always provided in a bicycle, and since there is usually no frame below the bottom plate of the bracket mounted as described above, The drive unit can be easily attached without reworking the bicycle frame.

Further, the unit mounting bracket has a mounting hole through which a bolt for fixing the drive unit passes through at least the bottom plate, and when the drive unit is mounted, the head of the bolt extends from the side plate. It is preferably on the front side of the bottom plate. In this case, once installed, the frame exists above the head of the bolt, so it is impossible to loosen the bolt and remove the drive unit.

The drive unit preferably includes at least an electric motor for outputting an electric power, a speed reducing means for the electric motor, and a control means for controlling the electric motor in the housing. If the drive unit is housed in one housing, the power assisted bicycle and the electric bicycle can be manufactured more easily due to the ease of mounting the unit mounting bracket according to the present invention.

In another preferred aspect of the unit mounting bracket of the present invention, the bottom plate comprises a main plate section whose two edges are defined by a set of side edges and a side of the main plate section that is different from the side edges. And an extension section extended from one. As a result, the area on which the drive unit is mounted can be increased and stability can be increased. For example,
The main plate section is formed in a rectangular shape and the extension section is
It is formed in an elongated shape that is narrower than the main plate section. Also, the main plate section and the extension section may each have at least one mounting hole for mounting the drive unit.

Since the drive unit outputs electric power,
As a reaction to the bracket that supports the unit, a stress that causes the unit to bend acts. Thus, in order to increase the strength of the bracket against such stresses, a preferred aspect of the present invention is that the bottom plate comprises at least one rib raised from one surface of the bottom plate. More preferably, the ribs extend linearly and extend between a pair of side plates over a substantial width of the bottom plate. For example, the rib is recessed on the surface opposite the raised side. In addition, the bottom plate preferably has a bent section that is bent at least on one of the sides different from the pair of sides and is substantially perpendicular to a plane stretched by the bottom plate.

Further, there is further provided a recessed section that is recessed across the plates from the area where the side plates and the bottom plate intersect to the inside of the bracket. This can prevent distortion of the positional relationship between the side plate and the bottom plate.

With respect to the pair of side plates, the side plates include a partial circular section with a side hole formed in the center of the circular section. The pair of side plates are formed with one or more slit holes for attaching separate members. It should be noted that the side plates are
It may have any shape such as a rectangular section or a polygonal section.

The bicycle with the drive unit combines the pedal effort detection means for detecting the pedal effort, the control means for controlling the electric power of the drive unit based on the detected pedal effort, and the controlled electric force with the rotational force based on the pedal effort. And a transmission means,
It can be configured as an electrically assisted bicycle.

The drive unit-equipped bicycle can be configured as an electric bicycle capable of both traveling by pedaling force and electric power of the drive unit. Other objects and advantages of the present invention will be more clearly understood by considering the preferred embodiments of the present invention described below.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an outline of an electrically assisted bicycle 1 according to a first embodiment of the present invention. As shown in the figure, this power-assisted bicycle 1
The main skeleton part of the vehicle is composed of a body tube 3 made of metal tube as in a normal bicycle. The body frame 3 includes front wheels 20, rear wheels 22, a handle 16, and a saddle 1.
8 and the like are attached in a known manner.

A drive shaft 4 is rotatably supported on the lower central portion of the vehicle body frame 3, and pedals 8L, 8 are provided on both left and right ends of the drive shaft 4 via crank bars 6L, 6R.
Each R is attached. This drive shaft 4
Is a one-way clutch (9 in FIG. 4B described later) for transmitting only rotation in the R direction corresponding to the forward direction of the vehicle body.
The main sprocket 2 is coaxially attached via 9). An endlessly rotatable chain 12 is stretched between the main sprocket 2 and a rear wheel power mechanism 10 provided at the center of the rear wheel 22.

The electrically assisted bicycle 1 of the present embodiment performs control to assist the pedal effort with an assist ratio (auxiliary power / pedal effort) determined at least from the vehicle body traveling speed and the pedal effort. An outline of the control system of the electrically assisted bicycle 1 that executes this control is shown in FIG. The control system of the electric assisted bicycle 1 according to the present embodiment includes one 16-bit 1-chip microcomputer 14 that collectively controls electronic processing of the entire bicycle, an electric motor 37 capable of PWM control, and a 1-chip microcomputer. An amplifier circuit 15 that is directly connected to the amplifier 14 and amplifies the power of the control signal, and a battery 17 that is connected to the amplifier circuit 15 and supplies power to the electric motor 37 are included.

The one-chip microcomputer 14 receives at least a rotation speed signal for calculating a traveling speed and strain gauge signals 1, 2 for calculating a pedaling force. The means for generating these input signals will be described later. The one-chip microcomputer 14 calculates the traveling speed and the pedaling force from these input signals, and performs an electronic process of determining the assist ratio based on a predetermined algorithm. Next, the 1-chip microcomputer 14 commands the electric motor 37 to generate auxiliary power corresponding to the determined assist ratio.
A pulse signal modulated into a pulse width according to the auxiliary power is sequentially output. The amplifier circuit 15 has not only a power amplification function for pulse signals but also a function as a pulse signal buffer.

Since the 1-chip microcomputer 14 is composed of 16 bits for one unit of data and command, it is possible to execute a program having a higher processing function than the 8-bit microcomputer used in the conventional electrically assisted bicycle. It becomes possible to execute faster based on a large amount of data. Therefore, in the present embodiment, the dedicated PWM control I
By omitting C, the electronic processing is collectively performed by the one-chip microcomputer 14, and the PWM control as described above is directly performed on the electric motor 37. This PWM control can be realized by software (including firmware) stored in a memory (not shown) of the 1-chip microcomputer 14.

As described above, in the present embodiment, by using the 16-bit microcomputer having a high processing capacity, the control that has conventionally been performed by using the dedicated IC such as PWM control can be performed without changing the basic design. I tried to do everything with a microcomputer. Therefore, it is possible to reduce the number of parts and the board area as a whole, which contributes to downsizing and total cost reduction. For example, a 16-bit microcomputer is more expensive than an 8-bit microcomputer,
If an IC dedicated to PWM control, an IC that performs other electronic processing such as battery level monitoring, and their peripheral parts are combined as the additional function means of the bit microcomputer, the cost increases when the 8-bit microcomputer is used. Becomes

Further, in the case of the 16-bit microcomputer, various processes can be easily realized by software, so that the circuit can be simplified and the function can be flexibly improved in the future, and the cost can be reduced from this point as well. Further, since the electric assist state can be constantly monitored by software, the electric motor 37 can be immediately stopped in any state. (Combined Force and Auxiliary Power Mechanism) A combined mechanism of the assisted power and the pedaling force in the electrically assisted bicycle 1 and a mechanism for supplying the assisted power will be described with reference to FIGS. 3 to 5.

In FIG. 3, the main sprocket 2 is shown on the back side (see FIG. 1).
(Opposite side of), an example of the resultant force mechanism is shown. The resultant mechanism transmits the auxiliary power from the power sprocket 33 to the auxiliary sprocket 30, the auxiliary sprocket 30 supported coaxially with the main sprocket 2, the power sprocket 33 rotatable by the auxiliary power output under a predetermined condition. To make these sprockets (30, 33)
An endless rotation assist chain 32 stretched between
including. Power sprocket 33 and sub sprocket 30
Have teeth of the same pitch, and preferably, the number of teeth of the power sprocket 33 is smaller than the number of teeth of the auxiliary sprocket 30.

Since the resultant mechanism shown in FIG. 3 is disposed inside the vehicle body with respect to the main sprocket 2, the auxiliary sprocket 30 is used.
Also, the protrusion of the power sprocket 33 to the outside of the vehicle body is eliminated, and the vehicle body can be downsized. Further, as shown in the drawing, the distance between the main sprocket 2 and the power sprocket 33 can be made smaller than the radius of the main sprocket 2, so that the total force mechanism can be made small. Therefore, as shown in FIG. 4A, when viewed from the outside (front side) of the bicycle, most of the resultant mechanism is hidden inside the main sprocket 2 in the axial direction, and there is no fear of impairing the appearance.
By attaching the chain cover 38 to the main sprocket 2 so as to hide the chain 12, the chain can be protected and the appearance can be further improved.

A sectional side view of FIG. 4 (a) is shown in FIG. 4 (b). As shown in the figure, the main sprocket and the sub sprocket 32 are fixed by pins 123 so as not to move relative to each other (that is, so as to rotate integrally), and they are both connected via the one-way clutch 99. Are linked to. The power sprocket 33 is operatively connected to the drive unit 13 via a power shaft 35 a extending parallel to the drive shaft 4. By forming serrations (see FIG. 3) in the center hole 34 of the power sprocket 33, sliding rotation between the power shaft 35a and the center hole 34 is prevented.

The drive unit 13 is attached to a frame similar to a general bicycle, and in its housing is connected to an electric motor 37 which is powered by a battery 17 (FIG. 2) and an output shaft 37a of the motor. Is
And a reduction mechanism 35 that reduces the rotational speed and transmits it to the power shaft 35a of the power sprocket 33. A so-called one-way clutch (not shown) that transmits power only in one direction is provided in the transmission path of the auxiliary power in the reduction mechanism 35. The one-way clutch is configured and connected so that the auxiliary power from the electric motor 37 is transmitted to the power sprocket 33, but the opposite direction, that is, the torque is not transmitted from the power sprocket to the reduction mechanism 35.

Next, the action of the resultant mechanism according to this embodiment will be described. When the electric motor 37 is rotationally controlled under a predetermined condition and the auxiliary power thereof is provided to the power sprocket 33 via the speed reduction mechanism 35, the torque of the power sprocket is changed via the assist chain 12 to the auxiliary sprocket 30.
And is fixed to the sub sprocket 30.
It is immediately transmitted to the main sprocket 2 rotated by the pedaling force. Thus, the resultant force of the auxiliary power and the pedal effort is achieved.

When the electric motor 37 is not rotating,
Due to the one-way clutch (not shown) provided in the speed reduction mechanism 35, the rotational load of the motor is increased by the power sprocket 33.
It is possible to drive lightly without being transmitted to.

As described above, in the present embodiment, the auxiliary power of the power sprocket 33 is not transmitted directly to the chain 12 for pedaling force transmission as in the prior art, but the auxiliary torque of the power sprocket 33 is passed through the separate chain 32. A so-called double chain system is adopted in which transmission is made to the sub sprocket 30 that rotates together with the main sprocket 2. As a result, the degree of freedom in the arrangement of the drive unit 13 is significantly increased as compared with the conventional technique. For example, as shown in FIGS. 3 and 4 (a), since the drive unit can be arranged in the traveling direction of the bicycle, a normal bicycle frame does not have to be a special frame specially prepared for an electrically assisted bicycle. However, the drive unit 13 can be attached.

Of course, the power sprocket 33 can be arranged at any position in the circumferential direction. FIG. 5 shows an example in which the position of the power sprocket 33 is changed by 90 degrees clockwise in the circumferential direction. In this case, the drive unit 13 can be attached to the support frame of the saddle 18 (FIG. 1). Furthermore, by selecting the length of the assist chain 32, the radial position of the power sprocket 33 (the distance from the center of the main sprocket 2 to the center of the power sprocket 33) can be freely adjusted to the outside or the inside. It will be possible. Thus, the minimum ground clearance of the drive unit 13 can be increased or decreased.

As described above, since the double chain system has a degree of freedom in installation, it can be electrified regardless of the type of bicycle. Conversely speaking, the degree of freedom in frame design is extremely high.

In addition, as shown, the power sprocket 3
If the number of teeth of 3 is made smaller than the number of teeth of the auxiliary sprocket 30, deceleration can be achieved only by the resultant mechanism. As a result, the reduction ratio of the reduction mechanism 35 can be reduced, and as a result, the reduction mechanism can be simplified and downsized. As described above, in this embodiment, the degree of freedom in design can be increased with respect to the reduction gear ratio. (First Embodiment of Unit Mounting Bracket) In order to attach the drive unit 13 to the vehicle body frame 3, the unit mounting bracket is used in the embodiment of the present invention.

FIG. 6 shows a first embodiment of the unit mounting bracket 70. The unit mounting bracket 70 is
The bottom plate 71 is formed of a pair of side plates 72R and 72L extending substantially vertically in the same direction with the pair of opposite side edges 81R and 81L of the bottom plate 71 as base ends. The pair of side plates 72R and 72L have side holes 84 through which the drive shaft 4 (see FIG. 14) can pass.
R and 84L are provided respectively.

The bottom plate 71 includes a pair of side edges 81R,
It has a main plate section 71a whose lateral edges are defined by 81L, and an extension section 73 which extends from a front side 81F of the main plate section different from the side edge. The main plate section 71a includes side sides 81R, 81L and front side 8
The entire circumference is demarcated by 1F and the rear side 81B, and is formed in a substantially rectangular shape. Extension section 73 is the main plate section 7
The taper is formed so that the width becomes gradually narrower as it goes away from 1a, and then the width becomes the same. Main plate section 71a and extension section 7
3 includes mounting holes 74 and 75 for passing mounting bolts of the drive unit 13, respectively. Further, in the main plate section 71a, openings 78R and 78L may be formed to allow the projection unit (not shown) of the drive unit 13 to pass therethrough and fix the drive unit 13 so that it does not move.

Further, the main plate section 71a is provided with a rib 76 which is raised from one surface of the bottom plate (the side on which the side plate extends in the illustrated example) and which is recessed on the opposite surface. It The rib 76 extends linearly and extends between the pair of side plates 72R, 72L over the substantial width of the bottom plate 71. The extension axis of the rib 76 in the length direction preferably intersects the pair of side plates 72R, 72L substantially vertically.

Further, the bottom plate 71 further includes a bent section 79 at the rear side 81B, which is bent substantially perpendicular to the plane on which the bottom plate 71 extends. In addition, a pair of recessed sections 77R, 7R, 7R, 7L recessed inward from the area where the pair of side plates 72R, 72L intersect the bottom plate 71 toward the inside of the bracket.
Further has 7L.

The ribs 76, the bent sections 79, and the pair of recessed sections 77R, 77L are formed on the bottom plate 71, the bottom plate 71, and the bottom plate 71 due to the reaction when the mounted drive unit 13 generates an electric force. The unit mounting bracket 70 is significantly strengthened so that the connecting portion between the side plates does not easily bend or deform.

The pair of side plates 72R, 72L includes a partial circular section 72C whose outer periphery is partially formed in a circular shape,
Each of them has an upright section 72M that continuously connects the circular section and the bottom plate 71. Side holes 84R and 84L are formed in the center of the circular section 72C, respectively.

A plurality of slit holes 80a, 80b, 80 for attaching separate members to the pair of side plates.
c, 80d are formed. In order to improve the convenience of attachment, notches may be provided in these slit holes as illustrated. The separate parts include, for example, covers such as the main sprocket 2 and the chain 12.

Next, a method of mounting the drive unit 13 using the unit mounting bracket 70 will be described with reference to FIG. FIG. 7A shows a state in which the unit mounting bracket 70 is arranged on the support portion 145 before the drive shaft 4 is actually attached to the vehicle body. The support portion 145 (see FIG. 4B) is located in the lower portion of the vehicle body frame 3 and has a shaft hole 9 for receiving the drive shaft 4.
0, and a bearing (Fig.
It is possible to pivotally support the drive shaft 4 via the bearings 138 and 139 in (b).

First, as shown in FIG. 7A, the shaft hole 90 and the side holes 84L and 84R are aligned with the support portion 145 sandwiched between the pair of side plates 72R and 72L.
Next, as shown in FIG. 7B, the drive shaft 4 is penetrated through the shaft hole 90 and the side holes 84L, 84, and the crank rod 6L is attached to the left and right ends thereof (correctly, the pedal shaft 146 of FIG. 10). The pedals 8L and 8R are attached via the pedals 6 and 6R, respectively. At this time, the pair of side plates 72R,
72L is fixed to the support portion 145 because it is tightened from both left and right ends. Actually, at first, the unit mounting bracket 70 is allowed to rotate in the clockwise direction and the counterclockwise direction (M direction in the figure) only when tightened in a state where it is not completely fixed (semi-fixed) in advance. . Then, in order to facilitate the attachment of the bolt, the extension portion 73 is made to stand still in a state in which the extension portion 73 is tilted several tens of degrees counterclockwise from the final attachment position.

Next, the mounting hole 7 of the bottom plate 71
A bolt 85 is passed through 4, 75 and screwed into a corresponding screw hole (not shown) of the drive unit 13 to be completely attached. Then, the unit mounting bracket 70 and the drive unit 13 mounted on the unit mounting bracket 70 are rotated clockwise to the actual mounting position shown in FIG. 7B.

Next, a pair of side plates 72R, 72L
Is completely tightened from both left and right ends. Preferably, the mounting fixture 87 fixed to the vehicle body frame 3 via the band 86 and the protrusion 8 of the frame drive unit 13
8 and 8 are fixedly connected. By further providing at least one fixing portion at another position as described above, the driving unit 13 can be fixed more firmly.

As described above, in the unit mounting bracket of this embodiment, the drive unit 13 can be easily attached without newly processing the frame of the ordinary bicycle. However, once attached, the frame 3 exists above the head of the bolt 85 shown in FIG. 7B, so that it is impossible to loosen the bolt 85 and remove the drive unit 13. Further, with a normal tool, the tightening of the bracket 70 cannot be loosened, and therefore the drive unit 13 cannot be easily removed to modify the vehicle body.

Further, in this embodiment, since the bracket 70 rotates around the side hole 84, an accurate unit mounting position is automatically determined without adjusting the mounting position. This is particularly effective when the bracket 70 is used in the case where the positioning is severe due to the above-described double-chain type resultant force mechanism.

Further, the bracket 70 of this embodiment can flexibly accommodate the drive unit 70 in various frames. Here, FIG. 8A shows an example in which the drive unit 13 is attached in an upright state. Figure 8
In (a), the protrusion 88 is fixed to the vertically extending frame.

FIG. 8B shows another mounting mode. In this example, the drive unit 13 is mounted between the upper and lower frames connected to the handle shaft by the bracket 70, and is mounted on the support frame of the saddle via a fixture such as a band 86 and the frame drive. The projection 88 of the unit 13 is fixedly connected. The cover 91 covers the space between the upper and lower frames and the entire lower part of the saddle support frame to improve the appearance and protect the machinery. At this time, a hole 92 may be provided in the cover 91 so that the drive unit 13 partially projects from this hole, whereby the drive unit 13 itself can be an accent for improving the appearance. (Second Embodiment of Unit Mounting Bracket) FIG.
The unit mounting bracket 250 concerning 2nd Embodiment applicable to a diamond type frame bicycle, such as a mountain bike, is shown. The unit mounting bracket 250 mainly includes a bottom plate 252, a pair of side plates 254R and 254L extending substantially vertically and obliquely rearward from the bottom plate 252, and substantially vertically at the ends of the bottom plate. And a bent end plate 276. A pair of side plates 254R, 254L
Is a partial circular section whose outer periphery is partially circular,
It is formed by a pair of side extension sections 256R, 256L extending from the bottom plate 252 substantially vertically along the length direction of the bottom plate as an extension section of the partial circular section, and at the center of the circular section. Drive shaft 4
(See FIG. 14) through which side holes 264R and 264L can pass.
Each is equipped with. Note that a plurality of slit holes 255 may be formed in the circular section for attaching separate members. Further, one or a plurality of (two in the illustrated example) side guide elongated holes 266 are formed in the side extension sections 256R and 256L.

The bottom plate 252 is used for the drive unit 13
Bottom guide slot 2 which serves as a guide means described later in
60 is formed. A pair of opposing long sides of the bottom guide slot 260 is formed with a pair of guide wall sections 262R, 262L that are bent substantially vertically from the bottom plate and extend in the same direction as the side plates 254R, 254L. Has been done. The guide wall sections 262R, 262L serve both to reinforce the unit mounting bracket 250 and to guide the drive unit 13 and, although not shown, correspond to the side guide slots 266 to guide them side by side. A slot for use is formed. A pair of guide wall sections 262R, 26
The 2L long guide holes are provided at the same height from the bottom plate as the side guide long holes 266, at the same width, and at the same longitudinal position.

For reinforcement, the bottom plate 252 is
The bottom plate is recessed from one surface (in the example shown, the side plate extends), and a raised rib 258 is formed on the opposite surface. The rib 258 extends linearly and extends between the pair of side plates 254R, 254L across the substantial width of the bottom plate 252. Rib 25
The longitudinal extension axis of 8 preferably intersects the pair of side plates substantially perpendicularly. In addition, as a further reinforcement, in a region where the pair of side extension sections 256R, 256L and the bottom plate 252 intersect with each other, a plurality of recesses (in the example of the figure, recessed between the plates toward the inside of the bracket, 6 recessed sections 267 are formed on each side.

The ribs 258, the recessed sections 267 and the end plates 276 are caused by the reaction of the mounted drive unit 13 when an electric force is generated by the bottom plate 252,
And, the connecting portion between the bottom plate and the side plate is
The unit mounting bracket 250 is significantly strengthened so as not to easily bend or deform.

In the bottom plate 252, two passage holes 272R and 272L are provided in the vicinity of the end plate 276 at a distance from the central axis in the length direction of the bottom plate.
Is formed. Two nuts 274R, 274L are fixedly connected to the bottom plate 252, center-aligned with the passage holes 272R, 272L, respectively.

Two passage holes 268R, 268L are formed in the mounting section of the pair of side plates 254R, 254L near the end plates 276. Two nuts 2
70R, 270L are fixedly coupled to the mounting sections of the side plates 254R, 254L, respectively centered with the passage holes 268R, 268L, respectively.

The end plate 276 also includes the passage hole 2
77 is formed. Next, a state in which the drive unit 13 is attached by the unit mounting bracket 250 will be described with reference to FIG.

As shown in FIG. 18, similarly to the unit mounting bracket 70 according to the first embodiment, the pair of side plates 254R, 254L are penetrated by the drive shaft to sandwich the supporting portion. At this time, the body frame 3
To the side extension section 25 of the unit mounting bracket 250.
The upper ends of 6R and 256L are applied from the upper side. A band 280 is wound around the vehicle body frame 3, and the band 280
A pair of mounting holes (not shown) and the side plate 256
Each is centered with two nuts 270R, 270L respectively secured to the R, 256L mounting sections, and bolts 282 are respectively screwed into these nuts, which causes band 280 to tighten the body frame. In addition, the set screws 278 are screwed into the nuts 274R and 274L fixed to the bottom plate 252, respectively.
Screw in until the tip of the pushes against the body frame.

As described above, the unit mounting bracket 250
Is extremely stable because it is fixed at both ends, and since the two push screws 278 are screwed at positions deviated from the central axis of the bottom plate in the lengthwise direction, there is a possibility that the drive unit 13 may be driven by a reaction force. With respect to the bending of the bracket caused by the force, it can bite into the frame 3 due to the reading effect, and the shift on the band side can be reliably prevented.

Next, the partial fine movement mechanism of the unit mounting bracket 250 will be described. The partial fine movement mechanism functions as a chain tension adjusting mechanism when used in combination with the double chain force applying mechanism.

The drive unit 13 includes a raised portion 2 for guiding.
88 is provided on the mounting surface. This guide ridge 2
88 passes through the bottom guide long hole 260 formed in the bottom plate 252. The width of the bottom guide elongated hole 260 is substantially the same as the width of the guide raised portion 288, and the length of the bottom guide elongated hole 260 is larger than the length of the guide raised portion 288. Therefore, the drive unit 13 is mounted on the unit mounting bracket 25 with the outer surface of the guide ridge 288 substantially in contact with the inner wall of the bottom guide elongated hole 260.
It becomes slidable along the length direction of 0.

Further, the ridges 288 are provided with 1
Or a plurality of (two in the example of the figure) guide protrusions 290
Is installed, and the guide protrusion 290 is provided with a side guide elongated hole 266 and a pair of guide wall sections 262R and 262L.
It is constructed and arranged so as to pass through a guide long hole (not shown). The diameter of the guide protrusion 290 is substantially the same as the width of the side guide elongated hole 266.
Less than 6 length. Therefore, in the drive unit 13, the outer surface of the guide projection 290 has the side guide slot 266.
Unit mounting bracket 2 with the inner wall of the unit almost in contact
It is possible to slide so as not to shift vertically with respect to 50.

When the raised portion 288 of the drive unit 13 is fitted into the bottom guide elongated hole 260, the area of the bottom plate around the bottom guide elongated hole 260 and the drive unit 13 are surrounded.
It is preferable to provide a contact area between and in order to stabilize the sliding of the drive unit 13. Therefore, the drive unit 13 is a flat surface capable of sliding contact with the flat surface portion of the bottom plate over a portion of the intersection of the raised portion 288 and the drive unit 13, that is, the base end portion of the raised portion 288 or the entire circumference thereof. Stabilized regions (not shown) are formed. This stabilizing region is in sliding contact with the bottom plate if it extends outwardly from the bottom guide elongated hole 260, so that the drive unit 1
When 3 slides, it functions as a so-called stabilizer that prevents the drive unit 13 from falling into the bottom guide long hole 260 and prevents the swinging motion of the drive unit 13.

This stabilizing region can be arbitrarily constructed as long as it functions as a stabilizer during sliding. For example, it may be formed as a planar region integrally formed with the housing of the drive unit 13 so as to project from the base end portion of the constituent raised portion 288. In addition, the drive unit 13
By attaching one or more angle members,
One or more stabilizing regions may be formed that overhang from the proximal end of the ridge 288. Furthermore, the drive unit 1
Such a stabilizing region may be formed by interposing a plane plate between the ridge 3 and the ridge 288 which is separate from the ridge 3. In the case of the unit mounting bracket 250 for the diamond frame as in this embodiment, the latter flat plate is considered to be suitable.

The stabilization area is the bottom plate 252.
It does not necessarily have to be flat as long as it can be slidably contacted with. For example, if the bottom plate has a curved cross-section, it can be shaped to have a matching cross-sectional curve.

The raised portion 288 has a long hole 260 for guiding the bottom portion.
It can be realized by any member capable of sliding contact inside. For example, it may be provided by attaching a separate bracket member, for example, an inverted U-shaped member in cross section to the housing of the drive unit 13, or the drive unit 1
It may be provided as a part integrally formed with the housing of FIG. Further, it may be formed as a plurality of legs that are raised only where the protrusion 290 is attached. Similarly, the protrusion 290 can be realized by any member that can be slidably contacted within the side guide elongated hole 266. For example, a round head screw having approximately the same diameter as the width of the slot 266, which can be screwed into the ridge 288 through the side guide slot 266 after the ridge 288 has been passed through the bottom guide slot 260. You may form as a member. In this case, screws that can be screwed in with a hex key are preferred.

Furthermore, a threaded shaft 284 is attached to the raised portion 288 so as to project from the front end portion thereof. When the drive unit 13 is attached to the bottom plate 252, the threaded shaft 284 extends along the length of the unit mounting bracket 250 and the end plate 27.
6 passes through the through hole 277 and projects. A nut 286 is screwed onto this protruding portion of the threaded shaft 284, and by rotating this nut 286, fine adjustment of partial movement along the length direction of the drive unit 13 is possible.

As described above, in the unit mounting bracket 250 of the second embodiment, since the position of the drive unit 13 in one direction can be finely adjusted, the tension and adjustment of the assist chain 32 on the power sprocket 33 can be performed. , Very easy. Further, the tension of the assist chain 32 can be easily adjusted even when the assist chain 32 expands or contracts over time.

Similar to the first embodiment, the drive unit can be flexibly attached to a frame of a normal bicycle, particularly a diamond type frame without processing. (Third Embodiment of Unit Mounting Bracket) FIG.
The unit mounting bracket 300 according to the third embodiment is applicable to a bicycle having a non-diamond frame, for example, a frame for folding, a light bicycle, or the like. The unit mounting bracket 300 mainly includes the bottom plate 3
02, a pair of side plates 304R and 304L extending substantially vertically from the bottom plate 302, and an end plate 314 bent substantially vertically at the ends of the bottom plate. A pair of side plates 304
R and 304L are a pair of a partial circular section whose outer circumference is partially circular, and an extension section of the partial circular section, which extends substantially vertically from the bottom plate 302 along the length direction of the bottom plate. Side extension sections 306R, 306L
And a side hole 307R through which the drive shaft 4 (see FIG. 14) can pass is formed in the center of the circular section.
Each is equipped with 307L. A plurality of slit holes 305 may be formed in the circular section for attaching separate members. Furthermore, the pair of side plates 304R, 30
Also in 4L, one or a plurality (two in the illustrated example) of the side guide elongated holes 320 are respectively formed.

The bottom plate 302 includes the drive unit 13
Slot for bottom guide 3 which serves as a guide means described later in
10 is formed. A pair of opposing long sides of the bottom guide slot 310 is formed with a pair of guide wall sections 312R, 312L that are bent substantially vertically from the bottom plate and extend in the same direction as the side plates 304R, 304L. Has been done. The guide wall sections 312R, 312L serve both to reinforce the unit mounting bracket 300 and to guide the drive unit 13. Although not shown, a guide long hole is formed in parallel with the side guide long hole 320. A pair of guide wall sections 312R, 31
The 2L long guide holes are provided at the same height from the bottom plate as the side guide long holes 320, at the same width, and at the same longitudinal position.

The bottom plate 302 is provided with reinforcement for reinforcement.
In a region where the pair of side plates 304R, 304L and the bottom plate 252 intersect, a plurality of (four in each of the left and right in the example of the figure) recessed sections that are recessed between the plates toward the inside of the bracket. 308 is formed. Further, a bending section 330 is formed at an end of the bottom plate 302 opposite to the end plate 314 and is bent substantially perpendicularly to the bottom plate 302.

The recessed section 308, the end plate 314 and the folded section 330 are caused by the reaction of the mounted drive unit 13 when an electric force is generated by the bottom plate 302 and between the bottom plate and the side plates. The unit mounting bracket 300 is significantly strengthened so that the connecting portion does not easily bend or deform.

Further, in the bottom plate 302, two passage holes 326R and 326L are provided in the vicinity of the bending section 330 and spaced from the central axis in the length direction of the bottom plate.
Is formed. Two nuts 328R, 328L are fixedly connected to the bottom plate 302, each centered with the passage holes 326R, 326L.

Two passage holes 322R, 322L are formed in the mounting section near the bending section 330 of the pair of side extension sections 306R, 306L. Two nuts 3
24R, 324L are centered with the passage holes 322R, 322L, respectively, to provide a pair of side extension sections 306R, 30R.
Fixedly connected to each of the 6L mounting sections.

The end plate 314 is also provided with the passage hole 3
16 is formed. A nut 318 is centered with the passage hole 316 and fixedly coupled to the end plate 314. Next, a state in which the drive unit 13 is attached by the unit mounting bracket 300 will be described with reference to FIG.

As shown in FIG. 20, similarly to the unit mounting brackets 70 and 250 according to the first and second embodiments, the pair of side plates 304R and 304L are penetrated by the drive shaft to sandwich the support portion. . At this time, the unit mounting bracket 300 is attached to the vehicle body frame 3.
The upper ends of the side extension sections 306R and 306L of are applied from below. A band 338 is wound around the body frame 3, and a pair of mounting holes (not shown) of the band 338 are provided.
Each is centered with two nuts 322R, 322L respectively secured to the mounting sections of the side extension sections 306R, 306L, and bolts 340 are respectively screwed into these nuts, thereby causing the band 338 to tighten the body frame. . In addition, the push screws are respectively screwed into the nuts 326R and 326L fixed to the bottom plate 302, and screwed until the tips of the push screws exert a pushing force on the vehicle body frame.

In this way, the unit mounting bracket 300
Is extremely stable because it is fixed at both ends, and since the two push screws 342 are screwed into positions deviated from the central axis of the bottom plate in the lengthwise direction, there is a problem in driving the drive unit 13. With respect to the bending of the bracket caused by the force, it can bite into the frame 3 due to the reading effect, and the shift on the band side can be reliably prevented.

Next, the partial fine movement mechanism of the unit mounting bracket 300 will be described. The partial fine movement mechanism functions as a chain tension adjusting mechanism when used in combination with the double chain force applying mechanism.

The drive unit 13 has a raised portion 3 for guiding.
34 is provided on the mounting surface. This guide ridge 3
34 passes through the bottom guide slot 310 formed in the bottom plate 302. The width of the bottom guide elongated hole 310 is substantially the same as the width of the guide raised portion 334, and the length of the bottom guide elongated hole 310 is larger than the length of the guide raised portion 334. Therefore, the drive unit 13 can be slid along the length direction of the unit mounting bracket 300 in a state where the outer surface of the guide ridge 334 is substantially in contact with the inner surface of the bottom guide elongated hole 310.

Further, the ridges 334 are provided on the side surfaces with 1
One or a plurality (two in the example in the figure) of the guide protrusions 336.
The guide protrusion 336 is configured and arranged so as to pass through the side guide elongated hole 320 and the guide elongated holes (not shown) of the pair of guide wall sections 312R and 312L. The diameter of the guide protrusion 336 is substantially the same as the width of the side guide elongated hole 320, and the side guide elongated hole 3
Less than 20 lengths. Therefore, the drive unit 13
The outer surface of the guide protrusion 336 is the side guide slot 32.
In a state where it is almost in contact with the inner surface of 0, it can slide with respect to the unit mounting bracket 300 so as not to be vertically displaced.

The structures of the raised portion 334 and the protruding portion 336 are as follows.
As in the case of the unit mounting bracket 250 of the second embodiment, it can be arbitrarily set. Further, also in the unit mounting bracket 300 of the third embodiment, it is preferable to similarly provide a stabilizing region that functions as a stabilizer during sliding.

Further, a push screw 332 is screwed into the nut 318 fixed to the end plate 314, and the wire end portion of the push screw is in contact with the raised portion 334. Therefore,
By rotating the push screw 332, the protrusion 3
34 is pushed by the push screw, and the partial fine movement adjustment along the length direction of the drive unit 13 becomes possible.

As described above, in the unit mounting bracket 300 of the third embodiment, since the position of the drive unit 13 in one direction can be finely adjusted, the tension and adjustment of the assist chain 32 on the power sprocket 33 can be performed. , Very easy. Further, the tension of the assist chain 32 can be easily adjusted even when the assist chain 32 expands or contracts over time.

Similar to the first embodiment, the drive unit can be flexibly attached to an ordinary bicycle frame, particularly a non-diamond type frame, for example, a bicycle having a frame such as a foldable or light bicycle without any processing. is there. (Rotation Speed Sensor) A rotation speed sensor that outputs a rotation speed signal input to the one-chip microcomputer 14 will be described.

FIG. 9 shows an NS polarized ring magnet 200 as one component of the rotation speed sensor. This ring magnet 200 has an opening 2 at its center.
05 is formed into a substantially flat ring. The ring magnet 200 is composed of a plurality of magnet sections that divide the ring at equal angles. In these magnet sections, the N pole section 202 facing the N pole side and the S pole side are facing when viewed from the front thereof. The south pole sections 204 are arranged alternately. In this case, as shown in the side view, the opposite side of the N-pole section 202 becomes the S pole, and the opposite side of the S-pole section 204 becomes the N pole so that the direction of the magnetic force lines is substantially perpendicular to the ring surface. It is preferable to orient the south pole. In the example shown, 1
Although two magnet sections are formed, the number of magnet sections may be larger or smaller than that, and can be arbitrarily changed according to the rotation speed of the detected portion and the required detection accuracy.

If there is a vertical component of the magnetic field with respect to the ring surface, the orientation of the N-S poles of each magnet section can be arbitrarily changed. For example, adjacent N-pole and S-pole sections may be circumferentially arranged as both poles of one magnet. In this case, the opposite side of the N pole section 202 also becomes the N pole and the opposite side of the S pole section 204 also becomes the S pole. However, from the viewpoint of the magnetic field strength, the example of FIG. 9 is considered preferable.

FIG. 10 shows a gear 210 as a portion whose rotational speed is to be detected. The gear 210 is the shaft 2
A ring groove 208 having a size and shape capable of accommodating the ring magnet 200 is formed on one surface thereof by being rotated by the torque transmitted by 14. The ring magnet 200 is housed in the ring groove 208 and attached with an adhesive or the like. At this time, as shown in the figure, it is preferable that the ring magnet 200 and the surface of the gear 210 are flush with each other. As a result, the ring magnet does not protrude from the gear surface, and the reduction in space due to the installation of the rotation speed sensor can be minimized.

A Hall IC 2 for detecting a magnetic field is provided adjacent to the ring magnet 200 installed on the gear 210.
12 are arranged. This Hall IC has a built-in element that produces a resistance value proportional to the current and the magnetic field in the direction perpendicular to the current and the magnetic field due to the Hall effect when the magnetic field is perpendicular to the direction of the current flow in the semiconductor. It is an existing magnetic field detection IC that outputs as a digital signal. The output end of the Hall IC 212 is connected to the one-chip microcomputer 14. A perspective view of the rotation speed sensor 220 shown in FIG. 10 is as shown in FIG. 11.

The 1-chip microcomputer 14 is the Hall IC 21.
The magnetic field detection signal (rotational speed signal) from 2 is analyzed by any suitable method to detect the rotational speed of the gear 210. Here, an example of the magnetic field waveform by the ring magnet 200 at the detection position of the Hall IC 212 is shown in FIG. The Hall IC 212 detects the magnetic field as shown in FIG. 12 (a) and outputs the pulse signal shown in FIG. 12 (b). The pulse signal of FIG. 12B temporally corresponds to the maximum portion on the N-pole side of the magnetic field waveform of FIG. In this case, only the positive value (N-pole side) is taken out and the negative value (S-pole side) is erased, but it is also possible to employ only the negative value or both positive and negative values. The cycle (inter-pulse time) of this pulse signal train is proportional to the rotation speed of the ring magnet 200. Therefore, the 1-chip microcomputer 14 uses the hall I
By detecting the time interval of the pulse signal from C212, the rotation speed of the ring magnet 200 and thus the gear 210 can be immediately obtained.

Of course, a magnetic field detection sensor other than the Hall IC, such as a coil, may be used as long as the magnetic field can be detected. In this case, the output of the magnetic field detection sensor is as shown in FIG.
An analog waveform as shown in (a) is obtained, and in the 16-bit 1-chip microcomputer 14, for example, the zero crossing point of the magnetic field signal (the time when the magnetic field strength is zero), the N pole side peak, or
A function for detecting the S pole side peaks and obtaining their times is further added. N-pole side peak 22 shown in FIG.
The 2nd and S-pole side peaks 224 respectively indicate the time points when the maximum magnetic poles of the N-pole section and the S-pole section have passed through the detection region of the magnetic field detection sensor, so that the gear 210 is determined by the appearance number of each peak and the time. The time T required to rotate can be detected. Thus, the rotation speed (2π / T) of the gear 210 can be immediately obtained. Of course, the rotation speed of the gear 210 may be calculated when the gear 210 rotates by a predetermined angle without waiting for one rotation of the gear 210.

In the rotation speed sensor of this embodiment, since the NS polarized ring magnet 200 has a flat ring shape, it is possible to achieve space saving and weight saving without being bulky. Further, since it has a very simple structure, it is easy to manufacture, so that the cost can be reduced.

Further, since a plurality of magnet sections are put together in one flat ring, it is very easy to assemble the apparatus. For example, as shown in FIG. 10, it is only necessary to dig a ring-shaped groove on the surface of the gear 210, embed a ring magnet therein and fix it with an adhesive or the like. Compared with the work of embedding the individual magnets corresponding to the polarization in the gear, the work efficiency can be improved in each stage. Furthermore, if the depth of the groove and the height of the ring magnet are aligned, they do not project to the outside at all, which contributes to space saving.

Further, the time resolution of the rotation speed can be improved by reducing the angular range occupied by each magnet segment. The rotation speed sensor 220 can be attached to any detected part that rotates so as to reflect the traveling speed of the electrically assisted bicycle 1. As the detected portion, a gear (not shown) in the speed reduction mechanism 35, which is operatively connected to the power sprocket 33 directly or indirectly via another gear, is a rotation speed sensor 220 in the housing of the drive unit 13. Can be accommodated, which is preferable. Examples of other parts include gears (not shown) arranged in the rear wheel power transmission mechanism 10, the sprocket 2, the auxiliary sprocket 30, the power sprocket 33, and the rotating portion of the front wheel axle. The 1-chip microcomputer 14 may have a reference table for converting the rotation speed of the inspected portion obtained as described above into the traveling speed of the electrically assisted bicycle 1. (Treading Force Detection Mechanism) A pedaling force detection mechanism for outputting the strain gauge signals 1 and 2 input to the one-chip microcomputer 14 will be described with reference to FIGS. 13 to 16. The pedal effort detection mechanism according to the present embodiment detects a strain that changes due to the deformation of the one-way clutch 99 according to the pedal effort.

As shown in FIG. 13, the main sprocket 2
Are rotatably supported by the drive shaft 4 via a one-way clutch 99. As shown in FIG. 14, the one-way clutch 99 includes a bridge portion 100 and a tooth portion 112.

In the piece section 100, three ratchet pieces 10 are provided.
2 is the second engaging surface 110 at equal angles along the circumferential direction.
It is located in. The ratchet piece 102 is made of a rigid body and is rotatable about an axis of the second engagement surface 110 that extends substantially in the radial direction. The ratchet piece 102 is
When no force is applied to the ratchet piece 102, it is urged by the piece raising spring 104 so that its lengthwise direction makes a predetermined angle with the second engagement surface 110 (balanced direction 160 in FIG. 15). Has been done. As shown in FIG. 15, when the ratchet piece 102 is deviated from the equilibrium direction 160 in the ascending direction a or the descending direction b, the piece raising spring 104 slightly moves the ratchet piece 102 so as to return the deviation to the equilibrium direction 160. Exerts elastic force.

Further, a piece portion bore 106 for receiving the drive shaft 4 is formed in the central portion of the piece portion 100, and the piece portion bore 106 also penetrates the cylindrical portion 103 protruding from the back surface 101 of the piece portion 100. is doing. A circular groove 155 (FIG. 13) is formed on the outer surface of the cylindrical portion 103 on the back surface 101, and a large number of steel balls 152 are formed in the circular groove 155.
Is rotatably fitted. By this, the back surface 1
At 01, a bearing for axial load bearing and sliding bearing is formed.

The disc spring 124 is brought into contact with the back surface 101 of the piece 100 through the cylindrical portion 103 through the center hole 127. At this time, the disc spring 124 slidably contacts the back surface 101 through the steel ball 152, that is, the load bearing, in a direction that elastically opposes the pressure from the piece 100. Belleville spring 1
On the surface of 24, strain gauges 126 are installed at two locations facing each other in a positional relationship of 180 degrees. These strain gauges 126 are electrically connected to the one-chip microcomputer 14 via lead wires 128. More preferably, three or more strain gauges may be installed on the disc spring 124. At this time, it is preferable to install a plurality of strain gauges on the surface of the disc spring 124 such that the strain gauges are in rotationally symmetrical positions.

The disc spring 124 is housed in the inner bottom portion 132 of the bowl-shaped supporter 130. The supporter 130 is provided with a support bore 133 for allowing the drive shaft 4 to pass therethrough and a support cylindrical portion 134 protruding from the rear surface. The outer peripheral surface of the support cylindrical portion 134 is threaded, and the support 130 is fixed to the vehicle body by screwing this into the threaded inner wall of the support portion 145. This supporting cylindrical portion 134
A bearing 138 for both axial and radial loads is engaged with the inner wall of the bearing 138 (see FIG. 13).
Is a stopper slope 1 formed on the drive shaft 4.
It is locked by 44. Similarly, drive shaft 4
Since the bearing 139 (see FIG. 4B) is mounted on the side opposite to the drive shaft 4, the drive shaft 4 is rotatable with respect to the vehicle body.

The first rotation preventing groove 108 extending in the axial direction 5 is formed at four locations on the inner wall of the piece bore 106. Second rotation prevention grooves 140 extending in the axial direction 5 are formed at four locations on the outer wall portion of the drive shaft 4 that is in sliding contact with the inner wall of the piece bore 106 so as to face the first rotation prevention groove 108. ing. As shown in FIG. 16 (a),
The first anti-rotation groove 108 and the second anti-rotation groove 140 facing the first anti-rotation groove 108 form a cylindrical groove extending along the axial direction, and each of the cylindrical grooves has a large number so as to be buried therein. The steel ball 150 is stored. As a result, the piece 100
Can move along the axial direction 5 with minimum frictional resistance, and can be prevented from rotating relative to the drive shaft 4. This is a kind of ball spline, but other types of ball splines such as an endless rotating ball spline can be applied as such a slidable rotation preventing means.

Further, as a method of attaching the piece portion 100 to the drive shaft 4, it is possible to use means other than the ball spline of FIG. 16 (a). For example, in FIG.
As shown in FIG. 6 (b), the protrusion 140a extending in the axial direction.
The so-called key spline type in which the drive shaft 4 is provided with the third rotation preventing groove 108a for accommodating the protruding portion 140a and formed in the bridge portion 100 is also applicable as the rotation preventing means. Note that, in FIG. 16B, the third rotation preventing groove 108 is provided with the protrusion 140 a on the side of the piece 100.
You may provide a on the drive shaft 4 side. Furthermore, FIG.
As shown in FIG. 6C, the fourth rotation preventing groove 108b extending in the axial direction and the fifth rotation preventing groove 1 facing the fourth rotation preventing groove 108b.
A so-called key groove type in which 40b is provided in each of the piece portion 100 and the drive shaft 4 and the key plate is housed in the rectangular parallelepiped groove formed by these grooves is also applicable as the rotation preventing means.

A plurality of ratchet teeth 114 for engaging with the ratchet piece 102 are formed on the first engaging surface 121 of the tooth portion 112. The ratchet teeth 114 are alternately and periodically formed along the circumferential direction of the tooth portion.
It is composed of a steeper slope 118 and a gentler slope 116 with respect to the engaging surface 121.

The tooth portion 112 is rotatably supported by the drive shaft 4 via the collar 111 so that the first engaging surface 121 of the tooth portion 112 faces the second engaging surface 110 of the bridge portion 100. . At this time, the ratchet piece 102 and the ratchet teeth 112 are engaged (FIG. 15). That is, the drive shaft 4 includes the ratchet piece 102 and the ratchet teeth 112.
Is operatively connected to the tooth portion 112 only through the engaging portion with. A washer 122 is fitted to the end portion 142 of the drive shaft 4 that has passed through the tooth bore 120 via the collar 111 so that the tooth portion 112 does not shift axially outward (FIG. 13). The main sprocket 2 is attached to the tooth portion 112 via a pin 123 (FIG. 13) so as not to move, and the pedal shaft 14 is attached to the tip of the drive shaft 4.
6 is attached. Thus, the ratchet gear that connects the drive shaft 4 and the main sprocket 2 is completed so that only the rotation due to the pedaling force in the vehicle body forward direction is transmitted to the main sprocket 2.

Preferably, the offset spring 136 is
The stopper slope 144 of the drive shaft 4 and the piece 1
It is preferable to interpose it with the back surface 101 of 00. The offset spring 136 is configured to generate a clearance between the steel ball 152 housed on the back surface 101 and the disc spring 124 when the pedal effort is equal to or less than a predetermined value (for example, when it is practically close to zero). 100 is axially biased.

Next, the operation of the main pedal force detecting mechanism will be described.
When an occupant applies pedaling force to the pedals 8R and 8L (FIG. 1) to rotate the drive shaft 4 in the forward direction of the vehicle body, this rotational force is non-rotatably and slidably supported on the drive shaft 4. It is transmitted to the bridge part 100.
At this time, as shown in FIG. 15, the ratchet piece 102
Since a force Fd corresponding to the pedaling force is applied from the bridge portion 100, its tip end contacts the steeper slope 118 of the ratchet teeth of the tooth portion 112, and tries to transmit this force to the ratchet teeth. Since the ratchet teeth 112 are connected to the main sprocket 2, the tip of the ratchet piece 102 receives the force Fp due to the driving load from the steeper slope 118. The ratchet pieces 102, to which the opposite forces Fp and Fd are applied from both ends thereof, rotate in the a direction and stand up. At this time, the piece 100 is moved inward in the axial direction by the rising of the ratchet piece 102, and the disc spring 124 interposed between the piece 100 and the supporter 130 is pushed. The disc spring 124 applies an elastic force Fr to the piece 100 in opposition thereto. This force Fr and the force reflecting the pedaling force that moves the piece 100 in the axial direction balance in a short time. Thus, the stress strain of the disc spring 124, the clearance between the piece portion 100 and the tooth portion 112, the angle of the ratchet piece 102 with respect to the second engagement surface 110,
The position of the piece 100 with respect to the body frame and the disc spring 12
The pressure at which 4 is pushed is a physical quantity that reflects the pedal effort. Therefore, the pedal effort T can be estimated by detecting at least one of these.

In this embodiment, the disc spring 124 is used as an example.
Detects the stress strain of. The one-chip microcomputer 14 performs at least addition calculation of signals from the two strain gauges 126 provided on the disc spring 124 (including average calculation). By averaging and measuring the stress-strain amounts at a plurality of points in this way, it is possible to obtain a large output change and smooth noise components even with the same pedaling force, thus improving the SN ratio and further improving the pedaling force estimation accuracy. Can be made. This effect increases as the number of strain gauges increases.

When the pedaling force is less than a predetermined value, the offset spring 136 is provided on the rear surface 1 of the bridge portion 100.
01 and the disc spring 124, a steel ball 152 is less likely to collide with the disc spring 124 frequently. As a result, the noise component of the strain gauge signal is reduced, and the stability of pedaling force detection and electric assist control can be improved.

Next, the one-chip microcomputer 14 calculates the auxiliary power Te for assisting to be applied based on at least the calculated pedaling force T, and controls the electric motor 37 to rotate with the auxiliary power Te. Calculate and output the signal.
Preferably, the one-chip microcomputer 14 converts the rotation speed signal detected by the rotation speed sensor 220 into a vehicle speed, and based on both the pedal effort T and the vehicle speed, an appropriate auxiliary power Te.
Then, the electric motor 37 is controlled so as to generate the auxiliary power Te.

The pedal effort detection mechanism of this embodiment has the following further excellent effects. Since the ratchet gear and the pedal effort detection mechanism are realized by one mechanism, the number of parts can be reduced, and the size, weight and cost can be reduced. In the part that detects the pedal effort, a disc spring with a receiving load unit and a load detection sensor integrated was used, and two functions were realized in one unit. it can. As described above and in the above, since the pedaling force detecting mechanism has been made smaller, lighter and simpler at a higher level, the possibility of attaching the pedaling force detecting mechanism to an ordinary bicycle is further expanded. For the reasons described in the above items and, the loss of load transmission is reduced as compared with the conventional mechanism, and the assist feeling with good control response can be realized. Because of the above items and the reason, compared to the conventional mechanism (using a coil spring), there is no unnecessary movement (until the sensor detects it) on the pedal, and the feeling when the pedal is depressed is that the conventional mechanism feels elastic when depressed. However, in the present embodiment, the feeling is similar to that of a normal bicycle.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned examples, and can be suitably modified within the scope of the gist of the present invention. For example, the unit mounting bracket according to the embodiment of the present invention is not limited to the power-assisted bicycle, but may be the drive unit 13
The present invention can also be applied to general bicycles of the type including, for example, an electric bicycle that can travel by both pedaling force and electric force. Like an ordinary bicycle, this electric bicycle is capable of traveling only by pedaling force, and is also capable of traveling only by electric force that does not depend on pedaling force by turning on a switch or the like. Of course, an electric assist mode corresponding to the pedaling force may be added to such an electric bicycle.

In the above example, the torque is transmitted from the electric motor 37 to the main sprocket 2 but the torque is not transmitted in the opposite direction. However, it may be provided at any other suitable position on the transmission path of the electric power from the electric motor 37 to the main sprocket 2. For example, although the sub sprocket is pinned to the main sprocket so as to rotate integrally with the main sprocket, the one-way clutch means may be provided on the torque transmission path between the sub sprocket and the main sprocket.

Further, whether one of the bridge and teeth of the one-way clutch 99 is attached to the sprocket and the other is attached to the drive shaft can be arbitrarily changed. For example, the piece 100 may be attached to the sprocket side, the teeth 112 may be attached to the drive shaft 4 slidably and non-rotatably, and the disc spring 124 may be pushed in by the teeth 112.

Further, in the above example, the stress strain of the disc spring was detected as a physical quantity related to the pedal effort, but the present invention is not limited to this, and any one-way clutch 99 that changes depending on the deformation according to the pedal effort is detected. A physical quantity can be detected. For example, the inclination of the ratchet piece, the relative distance between the ratchet piece and the ratchet tooth, the position of the ratchet piece and the ratchet tooth with respect to the vehicle body, and the pressure for pressing the disc spring are selected as physical quantities that reflect the pedaling force. be able to.

Further, the type and shape of the elastic body arranged against the deformation of the one-way clutch 99 can be arbitrarily changed. Other than the disc spring and the coil spring, for example, a rubber elastic body can be used. Further, although a strain gauge is taken as an example of the means for detecting the stress strain, it is not limited to this as long as a physical quantity related to the stress strain can be detected.

[0113]

As described above in detail, according to the unit mounting bracket of the present invention, the unit mounting bracket has the bottom plate and the pair of side plates, and the drive shaft penetrates through the pair of side plates. Since the bracket is fixed to the support portion and the drive unit is attached to the bottom plate while the support portion is sandwiched between the pair of side plates, 1. The drive unit can be easily and easily attached to a bicycle with a normal frame without processing. Around the side plate that passes the drive shaft, the bottom plate to which the drive unit is attached can be held so that the rotational position can be changed, so that the installation position can be automatically adjusted without adjusting the installation position. It is possible to obtain an excellent effect that is determined.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a power-assisted bicycle according to the present invention.

FIG. 2 is a schematic diagram showing a control system of the electrically assisted bicycle of the present invention.

FIG. 3 is an enlarged front view seen from the back side of the main sprocket in order to show a double chain system resultant force mechanism of the electrically assisted bicycle according to the embodiment of the present invention.

4A and 4B are views showing a force combination mechanism of the electric assist bicycle of the present invention, in which FIG. 4A is an enlarged front view of the main sprocket seen from the front side, and FIG. 4B is a side sectional view thereof.

FIG. 5 is a view showing a double-chain type combined force mechanism of an electrically assisted bicycle according to another embodiment of the present invention.
It is an enlarged front view seen from the back side of the main sprocket.

FIG. 6 is a top view and a side view of the unit mounting bracket according to the first embodiment of the present invention for mounting the drive unit to the vehicle body frame, which is used in the electrically assisted bicycle according to the embodiment of the present invention. Is.

7 is a schematic perspective view showing a procedure for attaching the unit mounting bracket shown in FIG. 6 to a vehicle body frame, and FIG. 7 (a) is a state in which the bracket is first aligned with the drive shaft receiving hole; (B) shows a state in which the drive shaft, the crankshaft, and the drive unit are attached from the state of (a).

FIG. 8 is a schematic perspective view showing a state in which a unit mounting bracket is mounted upright on another type of vehicle body frame, (a) without a cover and (b) with a cover. It is a figure.

9A and 9B are a top view and a side view of an NS polarized ring magnet as one component of a rotation speed sensor assembled in the electrically assisted bicycle of the present invention.

10 is a front view showing a state in which the NS polarized ring magnet of FIG. 9 is assembled to the gear surface to form a rotation speed sensor, and a side sectional view taken along a vertical line of the rotation speed sensor. is there.

11 is a perspective view of the rotation speed sensor of FIG.

FIG. 12 is a waveform showing a time change of a magnetic field signal detected by a Hall IC arranged adjacent to an NS polarized ring magnet.

FIG. 13 is a side sectional view around a drive shaft including a one-way clutch that embodies a pedaling force detection mechanism for an electrically assisted bicycle according to the present invention.

FIG. 14 is an exploded perspective view of the one-way clutch shown in FIG.

FIG. 15 is a diagram showing a fitting state of teeth and pieces of a one-way clutch (ratchet gear) for explaining the principle of pedaling force detection of the electrically assisted bicycle of the present invention.

FIG. 16 is a view showing an example of rotation preventing means for preventing relative rotation of the bridge portion with respect to the drive shaft,
(A) is a ball spline, (b) is a spline key,
(C) is a top view showing a schematic configuration of a key groove.

FIG. 17 is a top view and a side view of the unit mounting bracket according to the second embodiment.

FIG. 18 is a diagram showing a state in which a drive unit is attached to a vehicle body frame of a double-chain type power-assisted bicycle using the unit mounting bracket according to the second embodiment.

FIG. 19 is a top view and a side view of a unit mounting bracket according to a third embodiment.

FIG. 20 is a diagram showing a state in which a drive unit is attached to a vehicle body frame of a double-chain type power-assisted bicycle using the unit mounting bracket according to the third embodiment.

[Explanation of symbols]

1 Electric assist bicycle 2 Main sprocket 3 frames 4 drive shaft 12 chains 13 Drive unit 14 1-chip microcomputer (16 bits) 15 Amplification circuit 17 battery 22 Drive wheel (rear wheel) 30 Secondary sprocket 32 Assist chain 33 power sprockets 35 Reduction mechanism 35a output shaft 37 Electric motor 70 unit mounting bracket (first embodiment) 71 Bottom plate 71a Main plate classification 72R, 72L A pair of side plates 73 Extension 74, 75 mounting holes 76 ribs 77R, 77L A pair of recessed sections 78R, 78L opening 79 Bent section 80a, b, c, d slit holes 81R, 81L side 81F front side 81B rear side 84R, 84L side hole 86 fixture 87 Attachment 88 Projection 90 shaft hole 99 one-way clutch 100 pieces 102 ratchet pieces 112 teeth 114 ratchet teeth 124 Belleville 126 strain gauge 145 Support 200 ring magnet 212 Hall IC 220 rotation speed sensor 250 unit mounting bracket (second embodiment) 252 bottom plate 254R, 254L A pair of side plates 255 slit holes 256R, 256L A pair of side extension sections 258 ribs 260 Bottom guide slot 262R, 262L A pair of guide wall sections 264R, 264L A pair of side holes 266 Side guide oblong hole 267 recessed section 276 end plate 268R, 268L passage hole 270R, 270L nuts 272R, 272L through hole 274R, 274L nuts 277 passage hole 278 push screw 280 band 282 band mounting bolt 284 threaded shaft 286 Partial fine adjustment nut 288 Guide ridge 290 Guide projection 300 unit mounting bracket (third embodiment) 302 bottom plate 304R, 304L A pair of side plates 305 slit hole 306R, 306L A pair of side extension sections 307R, 307L A pair of side holes 308 recessed category 310 Long hole for bottom guide 312R, 312L A pair of guide wall sections 314 Edge plate 316 passage hole 318 Nut 320 Side guide slot 322R, 322L through hole 324R, 324L nuts 326R, 326L through hole 328R, 328L nuts 330 Bending section 332 Partial fine adjustment adjustment screw 334 Guide ridge 336 Guide protrusion 338 band 340 band mounting bolt 342 push screw

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kyosuke Ogatsu             7-1 Akita-cho, Takatsuki-shi, Osaka Sunstar             Giken Co., Ltd. (72) Inventor Akiya Yoshiya             7-1 Akita-cho, Takatsuki-shi, Osaka Sunstar             Giken Co., Ltd. (72) Inventor Nitaru             7-1 Akita-cho, Takatsuki-shi, Osaka Sunstar             Giken Co., Ltd.

Claims (64)

[Claims] 1. A bicycle with a drive unit, comprising a drive unit capable of outputting electric power, comprising: a drive shaft which is rotated by a pedaling force; a support portion which pivotally supports the drive shaft; and the drive unit fixed to a vehicle body. In order to do so, a unit mounting bracket having a pair of side plates and a bottom plate connected to the pair of side plates, and a transmission means for transmitting the electric power output from the drive unit to the drive wheels, The unit mounting bracket is fixed to the pair of side plates, with the drive shaft passing through the pair of side plates, and the support portion being sandwiched between the pair of side plates. By attaching the drive unit to the bottom plate, the drive unit is fixed to the vehicle body. Bicycle 2. The unit mounting bracket includes a bottom plate and a side hole that extends substantially vertically with a pair of facing sides of the bottom plate as base ends and through which the drive shaft can pass. The drive unit-equipped bicycle according to claim 1, further comprising a pair of side plates that are provided in parallel with each other. 3. The bottom plate includes a main plate section whose both edges are defined by the pair of side edges, and an extension section extended from one of the sides of the main plate section different from the side edges. The bicycle with a drive unit according to claim 2, which comprises: 4. The bicycle with a drive unit according to claim 3, wherein the main plate section is formed in a rectangular shape. 5. The bicycle with a drive unit according to claim 3, wherein the extension section is formed in an elongated shape narrower than the main plate section. 6. The main plate section and the extension section are at least one for mounting the drive unit.
The drive unit-equipped bicycle according to any one of claims 3 to 5, each having three mounting holes. 7. The unit mounting bracket has a mounting hole through which a bolt for fixing the drive unit passes, at least in the bottom plate, and when the drive unit is mounted, the head of the bolt has the side portion. Bicycle with a drive unit according to any one of claims 1 to 6, which is on the surface side of the bottom plate from which the plate extends. 8. The bicycle with a drive unit according to claim 1, wherein the bottom plate includes a frame mounting means for fixing an end portion of the bottom plate to a vehicle body frame. 9. The bicycle with a drive unit according to claim 8, wherein the frame attaching means includes band means for tightening the body frame, and connecting means for connecting the band means to the bottom plate. 10. A mounting section extending substantially vertically from said bottom plate and having a mounting hole, said coupling means passing through said band means and said mounting hole to connect said band means. The bicycle with a drive unit according to claim 9, which is a fastener for attaching to the attachment section. 11. The bottom plate comprises a pushing means for exerting a pushing force on the vehicle body frame at the end portion where the frame mounting means is provided.
A bicycle with a drive unit according to claim 10. 12. The pressing means is at least 2 screwed into a position off the central axis of the bottom plate.
Bicycle with a drive unit according to claim 11, which is a book push screw. 13. The drive unit according to claim 1, wherein the unit mounting bracket further includes a sliding unit capable of sliding the attached drive unit in one direction along the bottom plate. Bicycle with unit. 14. The sliding means includes guide means for guiding the drive unit so as not to deviate from the one direction when sliding the drive unit, and moving means capable of moving and adjusting the drive unit along the one direction. The bicycle with a drive unit according to claim 13, further comprising: 15. The guide means has a bottom guide elongated hole formed in the bottom plate, and the protrusion protruding from the mounting surface of the drive unit penetrates the bottom guide elongated hole. The bicycle with a drive unit according to claim 14, wherein the drive unit is slidable. 16. The guide means further has a side guide elongated hole formed in at least the pair of side plates, and a protrusion protruding laterally from the ridge is used for the side guide. The bicycle with a drive unit according to claim 15, wherein the drive unit is slidable while penetrating the elongated hole. 17. The pair of side plates further includes a side extension section extending from a base end of the pair of side plates in a length direction of the bottom plate. The bicycle with a drive unit according to claim 16, wherein the bicycle is formed in the extension section. 18. The driving unit is formed with a stabilizing region which is slidably contactable with the bottom plate over a part or the whole of a periphery of a base end portion of the raised portion. A bicycle with a drive unit according to any one of 17 items. 19. The moving means includes an end plate extending from an end of the bottom plate substantially perpendicular to the bottom plate, and a push screw screwed into the end plate, The drive unit-equipped bicycle according to any one of claims 14 to 18, wherein the drive unit is pushed in by the push screw and slides. 20. The moving means includes a threaded shaft attached to the drive unit so as to extend in the one direction, extends from an end of the bottom plate substantially perpendicularly to the bottom plate, and An end plate having an end hole through which the threaded shaft penetrates; and a bolt means screwed into a portion of the threaded shaft projecting from the end hole, wherein the drive unit includes the bolt. A bicycle with a drive unit according to any one of claims 14 to 18, which slides with the threaded shaft by rotation of the means. 21. The bicycle with a drive unit according to claim 1, wherein the bottom plate comprises at least one rib raised from one surface of the bottom plate. 22. The bicycle with a drive unit according to claim 21, wherein the rib extends linearly and extends between the pair of side plates over a substantial width of the bottom plate. 23. The bicycle with a drive unit according to claim 21, wherein a surface of the rib opposite to the raised side is recessed. 24. The bottom plate further comprises a fold section that is folded with respect to the bottom plate on at least one of the sides on which the side plates do not extend. A bicycle with a drive unit as described in. 25. The bicycle with a drive unit according to claim 24, wherein the folding section is substantially perpendicular to the bottom plate. 26. The method according to claim 1, further comprising one or a plurality of recessed sections which are recessed from the intersecting region of the side plate and the bottom plate toward both sides of the bracket toward the inside of the bracket. A bicycle with a drive unit according to any one of 1. 27. The pair of side plates includes a partial circular section, and a side hole for the drive shaft to pass through is formed at the center of the circular section.
A bicycle with a drive unit according to any one of 1. 28. The bicycle with a drive unit according to claim 1, wherein the pair of side plates are provided with one or a plurality of slit holes for attaching separate members. . 29. A main sprocket rotatable to transmit the rotational force of the drive shaft to a drive wheel is provided, wherein the transmission means outputs a sub sprocket coaxially rotatable with the main sprocket and the drive unit. 29. The bicycle with a drive unit according to claim 1, further comprising: a power sprocket that is rotated by an electric power, and an auxiliary chain stretched between the sub sprocket and the power sprocket. . 30. The unit mounting bracket further comprises sliding means capable of sliding the mounted driving unit in one direction along the bottom plate, and sliding of the driving unit by the sliding means. The bicycle with a drive unit according to claim 29, wherein the tension of the auxiliary chain can be adjusted by the. 31. Torque is transmitted from the electric motor in the direction of the main sprocket on the transmission path of electric force from the electric motor in the drive unit to the main sprocket, but torque is transmitted in the opposite direction. 30. The bicycle with a drive unit according to claim 29, wherein one-way clutch means configured and arranged to prevent transmission is interposed. 32. The bicycle with a drive unit according to claim 29, wherein an output shaft for outputting electric power is projected from the drive unit, and the power sprocket is directly connected to the output shaft. 33. The drive unit according to claim 1, further comprising, in its housing, an electric motor that outputs an electric force, a decelerating unit for the electric motor, and a control unit that controls the electric motor. Bicycle with a drive unit according to any one of claims. 34. A pedaling force detecting means for detecting the pedaling force, and a control means for controlling an electric force of the drive unit based on the detected pedaling force. The transmitting means includes a controlled electric force. The drive unit-equipped bicycle according to any one of claims 1 to 33, which is configured as an electrically assisted bicycle that combines a rotational force based on the pedaling force. 35. The bicycle with a drive unit according to any one of claims 1 to 33, which is configured as an electric bicycle which is capable of traveling by both pedaling force and electric power of the drive unit. 36. A bicycle with a drive unit, comprising: a drive shaft that rotates by pedaling force; a support portion that rotatably supports the drive shaft; and a drive unit that can output electric power. The drive unit is fixed to a vehicle body. A unit mounting bracket that can be used for: a pair of side plates; a bottom plate connected to the pair of side plates;
The unit mounting bracket is fixed to the pair of side plates, with the drive shaft passing through the pair of side plates, and the support portion being sandwiched between the pair of side plates. A unit mounting bracket for fixing the drive unit to the vehicle body by attaching the drive unit to the bottom plate. 37. The unit mounting bracket includes a bottom plate, a side hole extending substantially vertically with a pair of opposite sides of the bottom plate as base ends, and a side hole through which the drive shaft can pass. 37. The unit mounting bracket according to claim 36, comprising: a pair of side plates, each of which is provided substantially parallel to each other. 38. The bottom plate includes a main plate section having both edges defined by the set of side edges, and an extension section extending from one of the sides of the main plate section different from the side edges. 38. The unit mounting bracket according to claim 37, comprising: 39. The unit mounting bracket according to claim 38, wherein the main plate section is formed in a rectangular shape. 40. The extension section is formed in an elongated shape narrower than the main plate section.
Unit mounting bracket described in. 41. The main plate section and the extension section are at least one for mounting the drive unit.
The unit mounting bracket according to any one of claims 38 to 40, each having one mounting hole. 42. The unit mounting bracket has a mounting hole through which a bolt for fixing the drive unit passes, at least in the bottom plate, and when the drive unit is mounted, the head of the bolt has the side portion. 42. The unit mounting bracket according to any one of claims 36 to 41, which is on the surface side of the bottom plate from which the plate extends. 43. The unit mounting bracket according to any one of claims 36 to 42, wherein the bottom plate includes a frame attaching means for fixing an end of the bottom plate to a vehicle body frame. 44. The unit mounting bracket according to claim 43, wherein the frame attaching means includes band means for tightening the vehicle body frame, and connecting means for connecting the band means to the bottom plate. 45. Further comprising a mounting section extending substantially perpendicularly from the bottom plate and having a mounting hole, the coupling means passing through the band means and the mounting hole to connect the band means. The unit mounting bracket of claim 44, which is a fastener for attachment to the attachment segment. 46. The bottom plate comprises a pushing means for exerting a pushing force on the vehicle body frame at the end portion where the frame mounting means is provided.
The unit mounting bracket according to any one of claims 3 to 45. 47. The pressing means is at least 2 screwed into a position off the central axis of the bottom plate.
47. The unit mounting bracket of claim 46, which is a book push screw. 48. The unit according to claim 36, wherein the unit mounting bracket further comprises a sliding means capable of sliding the attached drive unit in one direction along the bottom plate. Mounting bracket. 49. The sliding means includes guide means for guiding the drive unit so as not to deviate from the one direction when sliding the drive unit, and moving means capable of moving and adjusting the drive unit along the one direction. 49. The unit mounting bracket of claim 48, having: 50. The guide means includes a bottom guide elongated hole formed in the bottom plate, and the protrusion protruding from the mounting surface of the drive unit penetrates the bottom guide elongated hole. 50. The unit mounting bracket of claim 49, wherein the drive unit is slidable. 51. The guide means further has a side guide elongated hole formed in at least the pair of side plates, and a protrusion protruding laterally from the ridge is used for the side guide. The unit mounting bracket according to claim 50, wherein the drive unit is slidable while penetrating the elongated hole. 52. The pair of side plates are formed with side extension sections extending from a base end of the pair of side plates in a length direction of the bottom plate. The unit mounting bracket according to claim 51, wherein the unit mounting bracket is formed in the partial extension section. 53. The driving unit is formed with a stabilization region capable of sliding contact with the bottom plate over a part or the whole of the periphery of the base end of the raised portion. 52. The unit mounting bracket according to any one of 52. 54. The moving means includes an end plate extending from an end of the bottom plate substantially perpendicularly to the bottom plate, and a push screw screwed into the end plate, The unit mounting bracket according to any one of claims 49 to 53, wherein the drive unit is pushed in by the push screw and slides. 55. The moving means includes a threaded shaft attached to the drive unit so as to extend in the one direction, extends from an end portion of the bottom plate substantially perpendicularly to the bottom plate, and An end plate having an end hole through which the threaded shaft penetrates; and a bolt means screwed into a portion of the threaded shaft projecting from the end hole, wherein the drive unit includes the bolt. 55. A unit mounting bracket according to any one of claims 48 to 54, which slides with the threaded shaft upon rotation of the means. 56. A unit mounting bracket according to any one of claims 36 to 55, wherein the bottom plate comprises at least one rib raised from one surface of the bottom plate. 57. The unit mounting bracket according to claim 56, wherein the rib extends linearly and extends between the pair of side plates over a substantial width of the bottom plate. 58. The unit mounting bracket according to claim 56 or 57, wherein a surface of the rib opposite to a raised side is recessed. 59. The bottom plate of any one of claims 36 to 58, further comprising a fold section that is folded with respect to the bottom plate on at least one of the sides on which the side plates do not extend. Unit mounting bracket described in. 60. The unit mount bracket of claim 59, wherein the fold section is substantially perpendicular to the bottom plate. 61. The method of claim 36, further comprising one or more recessed sections that are recessed across the plates from the intersection of the side plates and the bottom plate toward the inside of the bracket. The unit mounting bracket according to any one of 1. 62. The pair of side plates comprises a partial circular section, and a side hole for the drive shaft to pass through is formed at the center of the circular section.
The unit mounting bracket according to any one of 1. 63. The unit mounting bracket according to claim 36, wherein the pair of side plates are provided with one or more slit holes for mounting separate members. 64. The bicycle with a drive unit comprises a rotatable main sprocket for transmitting the rotational force of the drive shaft to a drive wheel, and the transmitting means includes a sub sprocket coaxially rotatable with the main sprocket. A power sprocket rotated by electric power output from the drive unit; and an auxiliary chain stretched between the sub sprocket and the power sprocket, wherein the unit mounting bracket is attached to the bottom plate. Along the line, there is further provided a sliding means capable of sliding the attached drive unit in one direction, and the tension of the auxiliary chain can be adjusted by sliding the drive unit by the sliding means. Item 36. The unit mounting bracket according to any one of items 36 to 63.