JPH1059265A - Bicycle with electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily step in a pedal by providing a one-way clutch of manually driving system coaxially arranged on a crankshaft and transmitting the rotation to a resultant force shaft, and a one-way clutch of electrically driving system transmitting the rotation of a motor to a driving gear. SOLUTION: Rotation input from a pedal 36 by human power is transmitted to a resultanut force shaft 56 through a crankshaft 32, a one-way clutch 60, and a planetary speed-increasing gear 62, and further transmitted to a rear wheel 14 through the transmission system of the rear wheel constituted of a bevel gear mechanism 58, a drive shaft 30, and the like. The one-way clutch 60 is provided on the upper stream side of a torque reaction mechanism 65, namely, on the crankshaft 32 side. Consequently, when the pedal 36 is reversely rotated during running, because of existence of the one-way clutch 60, the rotation of the crankshaft 32 is not transmitted to the torque reaction mechanism 65 and the resultant force shaft 56, and hence the reverse rotation of the pedal can be lightly operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor in which a drive system using human power and a drive system using an electric motor are provided in parallel, and the driving force of the electric motor is controlled in accordance with the change in driving force due to human power. It is about a bicycle with a stick.

[0002]

2. Description of the Related Art It is known to detect a driving force by human power and operate an electric motor when the driving force exceeds a set value (Japanese Patent Laid-Open No. 57-74285). That is, when the load of human power is large, the load of human power is reduced by adding the driving force of the electric motor.

[0003] However, in this proposed device, a crankshaft driven by human power, a motor shaft (motor shaft),
The resultant shafts to which the human power and the driving force of the motor are transmitted in parallel have been separately arranged side by side in parallel with each other and separated from the front and rear of the vehicle body. For this reason, there is a problem that the driving device becomes large in the longitudinal direction of the vehicle body.

A one-way clutch for a manual drive system for transmitting rotation of a crankshaft to a resultant shaft and a one-way clutch for an electric drive system for transmitting rotation of a motor to the resultant shaft are coaxially arranged with the resultant shaft. Was. For this reason, the axial width of the driving device increases. As a result, the interval between the crank pedals attached to both ends of the crankshaft is widened, and there is also a problem that the stepping operation of the crank pedal is difficult and the operability is deteriorated.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and provides a bicycle with an electric motor that is suitable for reducing the size of the entire driving device and that can reduce the distance between crank pedals and facilitate the pedal depressing operation. The purpose is to do.

[0006]

According to the present invention, it is an object of the present invention to provide a bicycle with an electric motor in which a human-powered driving system and an electric driving system are provided in parallel and the output of the electric driving system is controlled in response to a change in driving power due to human power. , A crankshaft driven by a crank pedal of the manual drive system, a resultant shaft coaxially and rotatably held on the crankshaft and connected to a transmission system of a rear wheel, and coaxially disposed on the crankshaft. A torque response mechanism that is displaced in accordance with a change in drive torque of the crankshaft, a sensor that is disposed close to the outside in the radial direction of the crankshaft, and detects a displacement of the torque response mechanism, and is disposed coaxially with the crankshaft. And a one-way clutch of a manual drive system for transmitting the rotation of the crankshaft to the resultant shaft, a motor-side drive gear for transmitting the motor output of the electric drive system to the resultant shaft, and meshing therewith. A bicycle with an electric motor, comprising: a driven gear on the resultant force shaft side; and an electric drive system one-way clutch disposed on the motor side upstream of the drive gear and transmitting rotation of the motor to the drive gear. Achieved.

If a one-way clutch of a manual drive system is disposed upstream of the torque response mechanism, that is, on the crankshaft side, when the crank pedal is rotated in the reverse direction, the force in the reverse direction is not transmitted to the torque response mechanism or the motor. It is desirable that the reversing operation becomes lighter. In addition, a torque response mechanism is arranged on one side in the vehicle body width direction with a one-way clutch of a manual drive system and a driven gear on the resultant shaft side of the electric drive system interposed therebetween, and a rear side on the other side in the vehicle body width direction. It is desirable to provide a wheel transmission system.

[0008]

FIG. 1 is a side view of one embodiment of the present invention, and FIG.
3 is a power system diagram, FIG. 3 is a development view of the power system, FIG. 4 is a side view showing a treading force detecting unit, and FIG. 5 is a cross-sectional view taken along line VV.

In FIG. 1, reference numeral 10 denotes a main frame, which extends rearward from a head pipe 12 obliquely downward and rearward.
4 axles. A seat tube 16 is fixed substantially perpendicular to the main frame 10, and a seat post 20 for supporting a saddle 18 is fixed to an upper end of the seat tube 16.

A lower portion of the seat tube 16 is formed with a cylindrical portion 16a which is opened downward, and accommodates the electric motor 22 therein. The power unit 2 is provided at the lower end of the seat tube 16.
4 is fixed. The power unit 24 includes a bottom bracket case (hereinafter referred to as a BB case) 26 and a rear stay 28 extending rearward from the BB case 26. The rear wheel 14 is fixed to a rear end of the rear stay 28. The drive shaft 30 is inserted through the right rear stay 28 (FIG. 3).

Next, the power unit 24 will be described. Figure 1,
3, a crankshaft 32 is inserted into the BB case 26, and a crank 34 is fixed to both ends of the crankshaft 32. The crank 34 has crank pedals 36 attached thereto.

The left end of the axle 38 of the rear wheel 14 is fixed to an end plate 28a fixed to the left rear stay 28,
The right end of the axle 38 is fixed to a bevel gear case 40 fixed to the right rear stay 28. A hub 42 is rotatably held on the axle 38, and the drive shaft 3
The rotation of 0 is transmitted via the bevel gear mechanism 44. A known freewheel (one-way clutch, not shown) is provided between the bevel gear mechanism 44 and the hub 42.

The electric motor 22 is fitted and fixed to the BB case 26 from above as shown in FIG. 3, and its motor shaft 22a is orthogonal to the crankshaft 32 and located near the center in the vehicle width direction. The BB case 26 is a seat tube 1
The motor 22 is fitted into the cylindrical portion 16a so as to be inserted from below into the cylindrical portion 16a, and is connected by four bolts 46 (see FIG. 3).

As shown in FIG. 3, the rotation of the motor 22 is transmitted to the crankshaft 32 via a one-way clutch 48, a planetary reduction gear 50, a small bevel gear 52 as a driving gear, and a large bevel gear 54 as a driven gear. Is transmitted to a cylindrical resultant shaft 56 which is held coaxially and rotatably. The rotation of the resultant shaft 56 is further transmitted to the drive shaft 30 by the bevel gear mechanism 58, and further transmitted to the rear wheel 14. Here, the one-way clutch 48 is provided in the motor 22. The bevel gear mechanism 58, the drive shaft 30, the bevel gear mechanism 44, and the like form a transmission system for the rear wheels.

When the motor 22 is stopped and the vehicle travels only with the manual drive system by depressing the pedal 36, the rotation of the resultant shaft 56 is not transmitted to the motor 22 because the one-way clutch 48 is provided. The planetary reduction gear 50 is a known one,
Sun wheel (sun gear) rotated by motor 22 and BB
The revolving motion of a planetary wheel (planetary gear) which is located between and meshes with an outer ring (ring gear) fixed to the case 26 is transmitted to the small bevel gear 52.

On the other hand, the rotation input manually from the pedal 36 is transmitted to the resultant shaft 56 via the crankshaft 32, the one-way clutch 60 and the planetary gearbox 62, and further transmitted to the bevel gear mechanism 58, the drive shaft 30 and the like. And transmitted to the rear wheel 14 via a rear wheel transmission system consisting of Here one-way clutch 60
The large bevel gear 54 as the driven gear described above is located near the middle of the crankshaft 32.

The one-way clutch 60 is located upstream of a torque responsive mechanism 65, which will be described later,
It is provided on two sides. Therefore, when the pedal 36 is reversed during running, the rotation of the crankshaft 32 is controlled by the torque response mechanism 65 and the resultant shaft 56 because the one-way clutch 60 is provided.
Does not reach. Here, the transmission system of the rear wheels including the bevel gear mechanism 58, the drive shaft 30, the bevel gear mechanism 44, and the like is located on the right side of the plane A in the vehicle longitudinal direction passing through the motor shaft 22a (see FIG. 3).

The planetary gearbox 62 is, as shown in FIGS.
Outer ring (ring gear) 62a fixed to resultant shaft 56 side
And a sun wheel (sun gear) 62b fixed to the torque responsive lever 64 and a planet wheel (planet gear) interposed therebetween.
62c. The crankshaft 32 is a planetary wheel 62c
Is revolved through the one-way clutch 60. The one-way clutch 60 is provided between the planetary wheel 62 and the crankshaft 32.

The torque responsive lever 64 constitutes a part of a torque responsive mechanism 65 which is displaced in response to a change in driving torque when the pedal 36 is driven manually, and is formed by a reaction force applied to the sun wheel 62b during the manual drive. Rotate. This torque response mechanism 65 is located on the left side of the plane A. The torque responsive mechanism 65 is located on one side in the vehicle width direction with the one-way clutch 60 of the manual drive system and the large bevel gear 54 as a driven gear interposed therebetween, and has a rear wheel on the other side in the vehicle width direction. Transmission system is located.

The lever 64 of the torque response mechanism 65
As shown in FIGS. 4 and 5, one projection 64a has two projections 64a and 64b, and one projection 64a contacts the stopper 66 and rotates clockwise in FIG. 3, in other words, the direction opposite to the direction in which the pedaling force of the pedal 36 is applied. Regulate the rotation of Another second lever 68 abuts on the projection 64b, and the counterclockwise rotation of the lever 64 causes the second lever 68 to rotate clockwise.

The second lever 68 is given a return behavior by a return spring 70, whereby the lever 64 is moved to the position shown in FIG.
With this, return behavior in the clockwise direction is given. And this second
The amount of rotation of the lever 68 is transmitted to a potentiometer 72 as a sensor that is close to the outside of the crankshaft 56 in the radial direction. As a result, the lever 6
4 rotates counterclockwise in FIG. 4 and the second lever 68 rotates clockwise, so that the pedaling force, that is, the driving torque due to human power is obtained from the rotation amount of the potentiometer 72.

In FIG. 1, reference numeral 80 denotes a rechargeable battery such as a lead battery, and reference numeral 82 denotes a controller, which is accommodated between the head pipe 12 and the seat tube 16 of the main frame 10.

The torque T detected by the potentiometer 72
Is input to the controller 82, and the controller 82
Controls the motor current based on the torque T due to the pedaling force to generate the motor torque T _M.

In the above embodiment, the rear wheels 14 are provided by a rear wheel transmission system comprising a shaft drive mechanism using the drive shaft 30.
In the present invention, the rear wheel 14 may be driven by a rear wheel drive system including a chain drive mechanism with the sprocket fixed to the resultant shaft 56.

[0025]

As described above, according to the first aspect of the present invention, since the resultant shaft is provided coaxially with the crankshaft, they do not separate in the longitudinal direction of the vehicle body, and the human-powered drive system and the electric drive system are connected to the crankshaft. Can be placed around. For this reason, the entire drive device can be downsized in the vehicle longitudinal direction. In addition, the one-way clutch of the manual drive system is arranged coaxially with the crankshaft, the one-way clutch of the electric drive system is arranged on the motor side, and both one-way clutches are dispersed, so that the Compared to the one in which these one-way clutches are juxtaposed in the length direction, downsizing in the vehicle body width direction can be achieved. For this reason, the interval between the crank pedals can be reduced, and the pedal depressing operation can be easily performed. Furthermore, since not only the resultant shaft but also the torque responsive mechanism is disposed coaxially with the crankshaft, the torque responsive mechanism can be brought close to both the crankshaft and the resultant shaft, which is suitable for downsizing of the manual drive system.

If the one-way clutch of the manual drive system is disposed on the upstream side of the torque response mechanism, when the crankshaft is rotated in the reverse direction, no manual power is transmitted to the torque response mechanism and the motor, and the reverse operation of the pedal is reduced, and At this time, it is easy to adjust the pedal position to a position where it is easy to pull out (claim 2).

Here, a one-way clutch of a human-powered driving system provided on the crankshaft is sandwiched, and a torque response mechanism is provided on one side in the vehicle width direction, and a transmission system for the rear wheels is provided on the other side in the vehicle width direction. Can be arranged. This torque response mechanism needs to transmit its displacement to a sensor disposed near the radial outside of the crankshaft, so it increases in the radial direction, whereas a one-way clutch is generally easy to reduce the diameter. . Therefore, when a one-way clutch is provided between the torque responsive mechanism and the transmission system for the rear wheels, the small-diameter one-way clutch should be housed inside the torque responsive mechanism or inside the driven gear. , And downsizing in the crankshaft direction can be achieved (claim 3).

A torque responsive mechanism is disposed on one side in the vehicle width direction with a driven gear around the resultant shaft of the electric drive system, and a transmission system for the rear wheels is distributed on the other side in the vehicle width direction. Suitable for miniaturization of the entire drive system. Also, in this case, even if an electric drive system such as a drive gear meshing with the driven gear projects in the radial direction of the crankshaft, the case of the drive device does not increase in diameter near both ends of the crankshaft, and the case can be downsized. In addition, the case hardly hits the driver's foot (claim 4).

[Brief description of the drawings]

FIG. 1 is a side view of one embodiment of the present invention.

Fig. 2 Power system diagram

FIG. 3 is a development view of the power system.

FIG. 4 is a side view showing a treading force detection unit.

FIG. 5 is a sectional view taken along line VV.

[Explanation of symbols]

Reference Signs List 14 rear wheel 22 electric motor 22a motor shaft 30 drive shaft forming rear wheel drive system 32 crankshaft 36 pedal 48 one-way clutch of electric drive system 54 large bevel gear as driven gear 56 resultant force shaft 58 forming rear wheel drive system Bevel gear mechanism 60 one-way clutch of human power drive system 64 torque response lever 65 torque response mechanism 72 potentiometer (torque sensor) as sensor

Claims (4)

[Claims] 1. A bicycle with an electric motor, wherein a human-powered driving system and an electric driving system are provided in parallel, and the output of the electric driving system is controlled in response to a change in driving force due to human power. And a resultant shaft coaxially and rotatably held on the crankshaft and connected to the transmission system of the rear wheel, and according to a change in the driving torque of the crankshaft which is coaxially arranged with the crankshaft. A torque responsive mechanism that is displaced in the radial direction of the crankshaft, a sensor that is disposed close to the outside in the radial direction of the crankshaft, and that detects a displacement of the torque responsive mechanism; A one-way clutch of a human-powered driving system that transmits the electric power to the shaft, a driving gear on the motor side that transmits the motor output of the electric driving system to the resultant shaft, and a driven gear on the resultant shaft that meshes with the driving gear; A bicycle with an electric motor, comprising: an electric drive system one-way clutch disposed on the motor side upstream of the drive gear and transmitting rotation of the motor to the drive gear. 2. The bicycle with an electric motor according to claim 1, wherein the one-way clutch of the manual drive system is disposed upstream of the torque response mechanism. 3. A torque responsive mechanism is disposed on one side in the vehicle width direction with a one-way clutch of a manual drive system interposed therebetween, and a transmission system for a rear wheel is disposed on the other side in the vehicle width direction. The bicycle with an electric motor according to claim 1. 4. A torque responsive mechanism is disposed on one side in the vehicle width direction with a driven gear on a resultant shaft side of the electric drive system interposed therebetween.
The bicycle with an electric motor according to claim 1, wherein a transmission system for a rear wheel is disposed on the other side in the vehicle width direction.