JP2000177677A - Bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the maneuverability of a bicycle by providing an in-wheel motor light in weight, and small in size. SOLUTION: The power transmission mechanism of an assit bicycle is so devised as to be made small in size, and light in weight by compactly housing a power mechanism such as a motor, a reduction gear and the like in a hub supporting the spokes of a front wheel. In addition, in a Corioli's movement gearing, since a great reduction ratio can be obtained, it is sufficiently good enough that the motor to be used herein is small in size, and light in weight, and it can thereby be devised to reduce its weight and electrical consumption as well. This constitution thereby enables a distance obtainable by one time electrical charging to be extended. Furthermore, driving the front wheel 4 by means of an in-wheel motor acting as an auxiliary power device, and driving a rear wheel 105 by means of stepping force in order to stabilize control stability at the time of running over a road surface slippy in particular.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle, such as a motorcycle or an assist bicycle, provided with an electric motor as a main power source or an auxiliary power source.

[0002]

2. Description of the Related Art In recent years, a bicycle capable of running with approximately half the leg force as compared to a bicycle running solely by human power by supplying auxiliary driving force to wheels in accordance with the pedaling force applied to the pedal (the book). In the explanation, it is called "assisted bicycle." FIG. 12 schematically shows a typical structure of a conventional assisted bicycle. This assist bicycle 101 has an auxiliary power unit 102 with a frame 103
It is fixed to. Other, like the normal bicycle, front wheel
104, rear wheel 105, handle 106, saddle 107, front fork 108. In addition, the pedaling force applied to the pedal 112 is transmitted to the driving sprocket 109 via the crank 111 and transmitted to the driven sprocket 110 provided on the rear wheel via the chain 113, as in a normal bicycle. In the figure, portions indicated by reference numerals 114 and 115 are mudguards.

An auxiliary power unit 102 detects a pedaling force applied to a pedal 112 and, in accordance with the pedaling force, auxiliaryally drives a driving sprocket 109 by an electric motor. Therefore, the total force of the pedaling force applied to the pedal 112 and the power generated by the auxiliary power device 102 is transmitted to the driven sprocket 110 via the chain 113, and drives the rear wheel 105.
Also, as shown in FIG.
There is also an assist bicycle of a type that incorporates a so-called direct drive motor 116 into the 05 and directly supplies power to the rear wheels.

[0004]

SUMMARY OF THE INVENTION In order to increase the distance over which assist power can be obtained by one charge, and to improve the handleability of the bicycle, the assist bicycle has been reduced in size and weight. It is necessary to further reduce the power consumption and power consumption. However, in order to obtain a necessary driving torque, there is a limit to downsizing the motor and the like.
The present invention has been made in view of the above problems, and an object of the present invention is to reduce the size and weight of a power source of an electric bicycle such as an assist bicycle having an auxiliary power device. Another object of the present invention is to reduce the power consumption to increase the mileage and contribute to the further spread of the electric bicycle.
Another object is to provide a motorcycle provided with an electric motor as a main or auxiliary power source.

[0005]

According to a first aspect of the present invention, there is provided a motorcycle including a first gear having n ₁ teeth fixed to a housing, and a fourth gear having n ₄ teeth fixed to an output shaft. A rotating body in which the input shaft and the input shaft are aligned with each other and the second gear having the number of teeth n ₂ and the third gear having the number of teeth n ₃ are integrally provided, the second gear meshes with the first gear , The third gear is rotatably supported by the inclined portion of the input shaft so as to mesh with the fourth gear.
On the X-axis of the XY coordinate system, the origin is a point where the center point of the common spherical surface passing through each pitch circle of the second gear and the central point of the common spherical surface passing through each pitch circle of the third and fourth gears coincide. Coriolis motion in which the shaft center of the input shaft is disposed and the mesh point of the first and second gears and the mesh point of the fourth and third gears are placed in the same quadrant or different quadrants of the XY coordinates. A gear device is provided as a speed reducer, and an electric in-wheel motor having a wheel hub driven by the output shaft in an outer housing is used as a power source.

In the present invention, an electric in-wheel motor in which an electric motor and a speed reducer are integrated into a wheel hub is used as a power source of a motorcycle. Further, by using a Coriolis motion gear device as the speed reducer, the speed reducer and the electric motor can both be compactly housed in the wheel hub. Further, since the electric motor used here is small and lightweight, it is possible to reduce the weight of the motorcycle and the power consumption.

[0007] Further, the motorcycle according to claim 2 of the present invention,
The bearing that supports the rotating body with respect to the inclined portion of the input shaft is a four-point contact ball bearing. This four-point contact ball bearing has a reduced number of parts compared to, for example, a double row angular contact ball bearing.
This is advantageous in reducing costs and the like.

Further, in the motorcycle according to a third aspect of the present invention, an outer ring of a bearing that supports the rotating body with respect to the inclined portion of the input shaft, and the rotating body are integrally formed. That is, by forming an outer ring of a bearing that supports the rotating body with respect to the inclined portion of the input shaft as a part of the rotating body, the outer ring is interposed between the inclined portion of the input shaft and the rotating body. Reduce the number of parts.

Further, the motorcycle according to claim 4 of the present invention,
A one-way clutch is interposed between the output shaft and the outer housing. Therefore, when no driving force is generated from the electric motor, only the wheels rotate without receiving a large resistance, and it is possible to prevent an increase in running resistance in the idle running state.

[0010] In addition, the motorcycle according to claim 5 of the present invention is characterized in that the in-wheel motor is provided on a front wheel. According to the present invention, the front wheels are driven by the in-wheel motor according to the present invention, and the rear wheels are driven by other motive power, so that a so-called all-wheel drive two-wheeled vehicle can be obtained, and steering stability can be improved. Moreover, if the in-wheel motor according to the present invention is supplied as an after-part such as replacing the wheel hub of the front wheel which does not normally have a power source with the wheel hub according to the present invention, the electric motor according to the present invention It is also possible to change to a motorcycle having a power source. Further, since the in-wheel motor is small and lightweight as described above, it does not adversely affect the steering performance of the two-wheeled vehicle even when attached to the front wheels. Further, it is easier to change the front wheel hub to the two-wheeled vehicle according to the present invention later than the rear wheel hub around which the chain is hung.

The electric bicycle according to claim 6 of the present invention is a motorcycle, and the electric bicycle according to claim 7 is an assist bicycle. . That is, according to the present invention,
It is possible to freely select whether to use the power generated by the in-wheel motor as the main power or the auxiliary power.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, the same or corresponding parts as in the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted.

First, a Coriolis motion gear device forming a part of the structure of the present invention will be described below with reference to FIGS. 5, 6, and 7. As shown in FIG. 5, the Coriolis motion gear device includes first to fourth gears A as four gears having different numbers of teeth.
It has a ₁ ~A _4. Each gear is a bevel gear. Among them, the first gear A ₁ is integrally fixed to the housing 6,
This is a fixed gear that does not rotate. The second gear A ₂ and the third gear A ₃ are formed on a rotating body 3 that is supported by the input shaft 1. The fourth gear A ₄ is provided on the output shaft 2,
It is rotatably supported by the housing 6. Then, the first gear A ₁ and the second gear A ₂ , and the third gear A ₃ and the fourth gear A ₃
Gear A ₄ Togaotto people are engaged.

The rotating body 3 is supported by an inclined portion 1a that forms a predetermined angle with respect to the axis of the input shaft 1. The input shaft 1 itself is also rotatably supported by the housing 6. When the input shaft 1 rotates, the inclined portion 1a makes a motion of swinging the head, and the rotating body 3 supported by the tilted portion 1a makes a swing motion as if it were a frame just before stopping. This movement of the rotating body 3 is called Coriolis movement. Then, the rotating body 3 makes a Coriolis motion, thereby meshing the second gear A ₂ with the first gear A ₁ and the third gear A ₃ with the fourth gear A ₄ (FIG. 6A ), (B)). Then
The second gear A ₂ has one cycle of Coriolis motion (1 of the input shaft 1).
Rotation) per rotates relative amount corresponding first gear A ₁ which corresponds to the difference in the number of teeth between the first gear A _1. That is, the first gear A
_1, between the second gear A _2, 1 stage speed reduction is performed.

Here, the number of teeth of the first gear A ₁ is set to 100,
The number of gear A ₂ Consider the case of a 101. When the input shaft 1 rotates forward once, the second gear A ₂ is moved relative to the first gear A ₁ .
Rotates forward by 1/100. Also, the number of teeth of the first gear A ₁ is
Assuming that 100 and the number of teeth of the second gear A ₂ are 99, the first gear A ₁
On the other hand, the second gear A ₂ rotates reversely by 1/100. Movement of the second gear A ₂ is transmitted directly to the third gear A _3, also between the third gear A ₃ and the fourth gear A _4, performs the same engagement. Therefore, even between the third gear A ₃ and the fourth gear A ₄ ,
One-step deceleration is performed. That is, when the rotational motion of the input shaft 1 is transmitted to the output shaft 2, the first and second gears A ₁ ,
And A _2, in the third, and the fourth gear A _3, A _4, will undergo a reduction effect of the two stages.

The reduction ratio of the Coriolis motion gear device is R
Assuming that (the rotation speed of the output shaft 2 when the input shaft 1 makes one rotation), R = 1− (n ₄ × n ₂ ) / (n ₃ × n ₁ ) (i) where n ₁ : first gear a ₁ number of teeth n _2: the second gear a ₂ of the number of teeth n _3: the third gear a ₃ number of teeth n _4: can be obtained in the number of teeth of the fourth gear a _4. Here, n ₁ = 999, n ₂ = 10
00, when _{n 3 = 1001, n 4 =} 1000, the reduction ratio R = 1/1
One million (positive rotation). As described above, the Coriolis motion gear device can obtain a large reduction ratio with only four gears. In addition, the efficiency η ≧ 0.9 can be achieved.

Further, when the second gear A ₂ and the third gear A ₃ engage with the first gear A ₁ and the fourth gear A ₄ while performing the Coriolis motion, sliding occurs on each meshing surface. To prevent image sticking due to noise, vibration and heat generated by the sliding, as shown in FIGS. 5 and 7, the teeth of each gear are provided with a roller 4 and an inscribed surface 5 with the roller. I have. Specifically, as shown in FIG. 7, the first gear A ₁ (the fourth gear A ₁ )
The roller 4 is floatingly supported on the inscribed surface 5 with the roller formed on the gear A ₄ ) to form a semi-cylindrical convex tooth. Also, the second
The gear A ₂ (third gear A ₃ ) is also formed with an inscribed surface 5 with the rollers, and has semicircular groove-shaped concave teeth. When the rotating body 3 makes a Coriolis motion in the direction shown by the arrow B, the second gear A ₂
The (third gear A ₃ ) moves in the direction shown by the arrow C and engages each concave tooth with the convex tooth. Then, the sliding generated between the concave teeth and the convex teeth is absorbed by the rotation of the rollers 4.
(The above is partly excerpted from NIKKEI MECHANICAL 1996.10.28 no.492, paragraphs 12 to 13.) Therefore, not only is it unnecessary to set the backlash, but also by applying a preload between the gears to precisely engage It can be performed.

As described above, when the difference between the number of teeth of the first gear A ₁ and the number of teeth of the second gear A ₂ is 1, when the Coriolis motion advances by one cycle, the first gear A ₁ and the second gear A 2 Between gear A ₂
The meshing teeth are shifted by one. When the number of teeth is two, if the Coriolis motion advances by one cycle, the first gear A ₁ and the second gear A ₁
Between the gear A ₂ , _two meshing teeth are shifted. Similarly, if the difference in the number of teeth is n, the meshing teeth are shifted by n. The same applies to the relationship between the _third and fourth gears A ₃ and A ₄ .

Next, a method of obtaining the tooth profile of the Coriolis motion gear device shown in FIG. 5 will be described below. Here, FIG. 8 is a development view showing a method of obtaining the tooth profile of each bevel gear of the Coriolis motion gear device shown in FIG. 5, and FIG. 9 is an enlarged view of a main part thereof. Each bevel gear A ₁ , A ₂ , A ₃ , A ₄ is schematically shown by a pitch cone.

Here, the first bevel gear A ₁ , the second bevel gear A
₂ common spherical surface Cir1 passing through each pitch circle and the third bevel gear A
_3, consider a common spherical Cir2 through each pitch circle of the fourth bevel gear A _4. Then, the center points of the common spherical surfaces are made to coincide with each other, and the coincident point is set as a point O. Further, consider XY coordinates with the point O as the origin. Input axis 1 (FIG. 5) on the X axis of the XY coordinates
Is arranged. Further, the first and second bevel gears A ₁ and A ₂
Point engagement of the C _1, third, the engagement point of the fourth bevel gear A _3, A ₄ and C _2. Then, the engagement points C ₁ and C ₂
In the first and third quadrants or in the second and fourth quadrants.

The axial direction of the input shaft 1 and the inclined portion 1a
(FIG. 5), the first gear A₁ Back cone and pi
Angle between the center of the₁ , The second bevel gear A_Two 
Angle between the spine of the back cone and the center line of the pitch cone is θ_Two Toss
Then, θ₁ + Θ_Two = Θ. Note that θ₁ , Θ_Two Nozomi
It is also possible to make one of the angles zero, in which case
, The bevel gear whose angle is zero is the crown gear. same
Thus, the third and fourth bevel gears A_Three , A_Four Back cone and each pi
The angle formed by the center of the notch cone is the third bevel gear A _Three Is θ
_Three , 4th bevel gear A_Four Is θ_Four And θ_Three + Θ_Four = Θ.

The number of teeth of each of the first to fourth bevel gears is n
₁ , N_Two , N_Three , N_Four And n₁ , N_TwoThe value of n_Three , N_Four 
Are different from each other. Here, the first to fourth umbrellas
Gear A ₁ ~ A_Four Apex O of each pitch cone₁ , O_Two , O
_Three , O_Four From the vertex D of each spine ₁ , D_Two , D_Three , D_Four 
Distance D to₁ O₁ , D_Two O_Two , D_Three O_Three , D_Four O_Four 
Is a cylindrical gear ER having a pitch circle radius₁ , ER_Two , ER
_Three , ER_Four think of. And formed on this pitch circle
Assuming an involute tooth profile or any tooth profile
This is the first to fourth bevel gears A₁ ~ A_Four Equivalent cylindrical gear
You. Here, the equivalent number of teeth of the equivalent cylindrical gear is Z₁ , Z_Two ,
Z_Three , Z_Four Then, Z₁ = N₁ / Sinθ₁ …… (ii) Z_Two = N_Two / Sinθ_Two …… (iii) Z_Three = N_Three / Sinθ_Three …… (iv) Z_Four = N_Four / Sinθ_Four ... (V).

In the equivalent cylindrical gear having the relationship obtained by the above formulas (ii) and (iii), an involute tooth profile or an arbitrary tooth profile is created by using a cutter for creating the first bevel gear A ₁ with a constant tooth profile ( Incidentally, if creating an equal height teeth, becomes also inevitably Toha thick tooth), further, to transfer the tooth-shaped to the second bevel gear a _2. The third and fourth bevel gears A ₃ and A ₄ are formed in the same manner. Furthermore, instead of the tooth profile of the above-mentioned contour tooth,
When the inscribed surface 5 with the rollers is formed, a tooth profile similar to that shown in FIG. 5 can be obtained. FIG. 5 shows a case where the roller 4 and the inscribed surface 5 with the roller are used as the tooth profile. The rollers used here include both cylindrical rollers and needle rollers.

As described above, the Coriolis motion gear device shown in FIG. 5 uses the meshing point C of the first and second bevel gears A ₁ and A _2.
1 and the meshing point of the third and fourth bevel gears A ₃ and A ₄ with C ₂
Are placed in the first and third quadrants or in the second and fourth quadrants, that is, when they are placed in different quadrants, the meshing points C ₁ and C ₂ are the same as each other. It is also possible to place it in the quadrant.

FIG. 10 is a cross-sectional view of a main part of the gear device when the meshing points C ₁ and C ₂ are placed in the same quadrant as a modification of the Coriolis motion gear device shown in FIG. I have. Note that FIG. 10 shows only parts different from the Coriolis motion gear device shown in FIG. The same or corresponding parts as those in the embodiment shown in FIG. 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 10, the first bevel gear A ₁ is fixed to a portion of the housing (indicated by reference numeral 6). The fourth bevel gear A ₄ is attached to the output shaft 2. The second and third bevel gears A ₂ and A ₃ provided on the rotating body 3 are provided on the same axial direction surface of the rotating body 3 (the left side surface of the rotating body 3 in FIG. 10). The input shaft 1 has the output shaft 2 hollow and the input shaft 1 penetrates the interior thereof. The input shaft 1 is also hollow, and the inside of the hollow is configured as a through passage 1b.

FIG. 11 is a development view of the Coriolis motion gear device shown in FIG. FIG. 11 corresponds to FIG. 9 which shows a development view of the Coriolis motion gear device shown in FIG. 5 into a corresponding cylindrical gear. The method for obtaining the tooth profile of the Coriolis motion gear device shown in FIG. 10 is the same as that of the Coriolis motion gear device shown in FIG. 5, and is an overall view of a development view corresponding to FIG. Is omitted. As apparent from FIG. 11, the Coriolis motion gear device of FIG. 10, first, second bevel gear A _1, engagement point C ₁ of A _2, 3,
Both the fourth bevel gear A _3, engagement point of A ₄ C ₂ is the second quadrant (or the third quadrant) of the XY coordinate, i.e. on the same quadrant.

The Coriolis motion gear device shown in FIG.
Placing the fourth to fourth bevel gears on the same axial surface of the rotating body 3 makes it possible to reduce the axial dimension of the gear device with respect to the Coriolis motion gear device shown in FIG. Also,
It is easy to arrange the output shaft 2 so as to extend in the same direction as the input shaft 1. Therefore, there is an advantage that the applicable range of the Coriolis motion gear device capable of obtaining a large reduction ratio with only four gears can be expanded. Further, both the Coriolis motion gear devices shown in FIGS. 5 and 10 can be configured as helical gears. The present inventor discloses the details of the application to the helical gear in Japanese Patent Application No. 9-65410.

As described above, the Coriolis motion gear device is:
By determining the tooth profile of the gear based on the corresponding cylindrical gears of each bevel gear A ₁ to A _4, by a small respective bevel gears A ₁ to A ₄ of the pitch circle diameter than said phase equivalent cylindrical gear, the corresponding cylindrical gear meshing teeth The same number of meshing teeth as the number can be obtained. Therefore, the Coriolis motion gear device can transmit a large torque for its size. As in the present invention, if the Coriolis motion gear device is used for an in-wheel motor in combination with a light and small motor, a small, light and large output can be obtained. An in-wheel motor can be configured.

Next, a case where an in-wheel motor having a Coriolis motion gear device as a speed reducer is used for a motorcycle will be described. FIG. 2 shows an electric assist bicycle according to an embodiment of the present invention. FIG. 1 shows an in-wheel motor which is an auxiliary power unit of the electric assist bicycle of FIG. The housing 6 has a disc-shaped portion (provisionally 6L) and a cylindrical portion (provisionally 6R).
), And each of 6L and 6R is non-rotatably supported by the tip 18 of the front fork of the bicycle. And a Coriolis motion gear device is provided as a reduction gear. A motor 13 is provided on one portion 6R of the housing 6.
Is provided. The motor 13 is a so-called "hollow motor" in which the rotating shaft 13a is a hollow shaft. The input shaft 1 of the Coriolis motion gear device is also a hollow shaft.
The axle shaft 19 is inserted through the through-path 13b of the rotating shaft 13a and the through-path 1b of the input shaft 1, and both ends of the axle shaft 19 are fixed to the front fork tip 18 so as not to rotate.

Further, the bearing 20 which supports the rotating body 3 has four points.
By using contact ball bearings, for example, double row angular
Lighter due to reduced number of parts compared to using ball bearings
Quantification, cost reduction, etc. can be achieved. Moreover,
The second gear A is provided on the outer ring of the bearing 20. _Two , The third gear A_Three Directly
The inclined portion 1a of the input shaft 1 and the rotating body
3 and the number of components interposed therebetween is reduced. Soshi
And, as much as the outer ring as a single unit has disappeared,
Second gear A to be formed_Two , The third gear A_Three , And input
The degree of freedom in setting the dimensions of the shaft 1 and the inclined portion 1a is increased. I
Therefore, the rotation of the input shaft 1 and the motor 13 as shown in FIG.
The shaft 13a is a hollow shaft, and an axle is
Even if a structure in which the shaft 19 is inserted is adopted, each gear
It is no longer necessary to increase the diameter of the housing.
The compaction of the Coriolis motion gear device and the motor 13
It becomes possible to put in.

The output shaft 2 is rotatably supported by the housing 6 coaxially with the input shaft 1. Further, an outer housing 21 that covers the housing 6 is provided radially outside the housing 6. The outer housing 21 has a cylindrical shape, and is rotatably supported by the housings 6L and 6R via angular ball bearings 22 and 23. And, by the output shaft 2, the outer housing
21 can be driven. That is, the in-wheel motor has a so-called “outer rotor geared motor” configuration. A disc-shaped flange 21a is formed on an outer peripheral portion of the outer housing 21, and a plurality of holes 21b for fixing a rim (not shown) are provided. In addition, from the output shaft 2 to the outer housing
A one-way clutch 24 is used as a power transmission mechanism to 21. The bearing used for each part can be changed to another type if necessary.For example, if the needle roller bearing denoted by reference numeral 25 is replaced with a four-point contact ball bearing, the input shaft can be changed. The positioning in the axial direction can be performed only by the bearing 25. Further, it can withstand higher-speed rotation.

FIG. 2 schematically shows an overall view of an electric assist bicycle according to an embodiment of the present invention. The electric assist bicycle 101 has the in-wheel motor described with reference to FIG. 1 provided in the hub of the front wheel 104 (FIG. 1 is a cross-sectional view taken along line II of FIG. 2).
Although the portion indicated by reference numeral 27 in the drawing is a battery, the mounting position of this battery is not limited to the illustrated position. The power supply from the battery 27 to the auxiliary power unit 102 can be performed via an electric cable or the like (not shown).

As described above, when the in-wheel motor for a bicycle is formed by using the Coriolis motion gear device according to the embodiment of the present invention, the power mechanisms such as the motor and the reduction gear are compactly mounted in the hub supporting the spokes of the wheels. It is possible to put in. Therefore, the power transmission mechanism of the electrically assisted bicycle can be reduced in size and weight. Also,
If the in-wheel motor according to the present invention is supplied as an after-part, such as exchanging the wheel hub of a bicycle having no ordinary power source and the wheel hub according to the present invention,
It is also possible to later replace a normal bicycle with the electric bicycle according to the present invention. In addition, since the Coriolis motion gear device is used as the reduction gear, a large reduction ratio can be obtained, and the motor 13 used here can be made small and lightweight, and the weight and power consumption can be reduced. be able to. Therefore, the distance over which the auxiliary power can be obtained by one charge can be extended. From the above, the spread of assisted bicycles can be promoted.

Further, by using a four-point contact ball bearing as the bearing 20 that supports the rotating body 3, the weight and cost can be reduced by reducing the number of parts, for example, as compared with the case of using a double row angular contact ball bearing. Can be achieved.

Further, the output shaft 2 and the outer housing 21
And a one-way clutch 24 is interposed therebetween. Therefore, when no driving force is generated from the motor 13, the front wheel 104 rotates without receiving a large resistance, and it is possible to prevent an increase in running resistance in the idle running state.

The electrically assisted bicycle according to the embodiment of the present invention has a so-called all-wheel drive bicycle in which front wheels 104 are driven by an in-wheel motor, which is an auxiliary power unit 102, and rear wheels 105 are driven by stepping force. Therefore, it is possible to improve the steering stability particularly when traveling on a slippery road surface (such as during snowfall). In addition, since the in-wheel motor is small and light,
Mounting on the 104 does not adversely affect the steering characteristics of the bicycle. Further, the work of changing the wheel hub of the front wheel 104 to the electric bicycle according to the present invention later is easier than the wheel hub of the rear wheel 105 around which the chain is hung.

By incorporating the in-wheel motor according to the present invention into the front wheels, the weight of the front wheels of a normal bicycle may be increased. By adjusting, it is possible to improve the straightness by increasing the so-called gyro effect without spoiling the turning performance and the like.

As described above, in the embodiment of the present invention, the electric assist bicycle using the power of the in-wheel motor as an auxiliary has been described as an example. However, the present invention can also be applied to a so-called electric moped or the like which can travel without human power using the power of the in-wheel motor as a main power. Further, it is also possible to use the in-wheel motor for the hub 31 of the front wheel 30 of a motorcycle having an engine 28 as a power source as shown in FIG. Also, by adopting the same manner for the hub 33 of the front wheel 32 of the scooter shown in FIG. 4 (the rear wheel is also driven by the engine), an all-wheel drive motorcycle and a scooter (including a moped) can be provided. It is possible. In addition, when applied to a motorcycle, the output of the engine itself is relatively large, so it is preferable to use the in-wheel motor according to the present invention as auxiliary power, and when applied to a scooter, the output of the engine itself is relatively large. Because of its small size, the in-wheel motor according to the present invention can be used as both a main power device and an auxiliary power device.

[0040]

According to the present invention, the following effects are obtained. First, according to the two-wheeled vehicle of the present invention, it is possible to reduce the weight of the power source and the power consumption.

Further, according to the second aspect of the present invention, it is possible to provide a two-wheeled vehicle having a low-cost in-wheel motor that can be reduced in size and weight.

Further, according to the third aspect of the present invention, by reducing the number of parts interposed between the input shaft and the gears, it is possible to set the dimensions of the input shaft and the rotating body. Can be expanded. Therefore, application as a power source of various motorcycles is possible. Further, the number of man-hours for assembling the Coriolis motion gear device, which is a speed reducer, is reduced, and the assembling accuracy is improved.
Further, since machining, heat treatment, and the like of the integrally formed portion can be performed in one step, it is also possible to reduce the processing cost of the in-wheel motor. For this reason, the cost of the wheel including the in-wheel motor can be reduced.

According to the motorcycle of the fourth aspect of the present invention, it is possible to prevent an increase in running resistance in an idle running state, thereby improving running performance and improving usability.

In addition, according to the motorcycle according to the fifth aspect of the present invention, it is possible to improve the steering stability. In addition, the operation when changing to a two-wheeled vehicle having the in-wheel motor according to the present invention as a power source later becomes easy. In addition, if the in-wheel motor according to the present invention is supplied as an after-part, a normal bicycle can be changed to the electric bicycle according to the present invention later.
In addition, by attaching it to an existing motorcycle or the like, it becomes possible to make the motorcycle all-wheel drive later.

Furthermore, the two-wheeled vehicle according to the sixth aspect of the present invention can be an all-wheel drive motorcycle, so that high running stability can be provided even on a slippery road surface. Further, since the motorcycle according to claim 7 of the present invention generates power so as to assist human power, it is possible to supply various types of electric bicycles according to the purpose.

[Brief description of the drawings]

FIG. 1 is a view showing an in-wheel motor of an electric assist bicycle according to an embodiment of the present invention, and is a cross-sectional view taken along line II of FIG.

FIG. 2 is a schematic view of the electric assist bicycle according to the embodiment of the present invention.

FIG. 3 is a schematic view of a motorcycle according to an embodiment of the present invention.

FIG. 4 is a schematic view of a scooter according to an embodiment of the present invention.

FIG. 5 is a schematic sectional view of a Coriolis motion gear device.

FIG. 6 is a schematic sectional view showing an operation of the Coriolis motion gear device shown in FIG. 5;

FIG. 7 is a schematic front view showing an operation state of the Coriolis motion gear device shown in FIG. 5;

FIG. 8 is a development view of the Coriolis motion gear device shown in FIG. 7 into an equivalent cylindrical gear.

FIG. 9 is an enlarged view of a main part of FIG. 8;

FIG. 10 is a sectional view of a main part showing an application example of the Coriolis motion gear device shown in FIG. 9;

FIG. 11 is a development view of the Coriolis motion gear device shown in FIG. 10 into an equivalent cylindrical gear.

FIG. 12 is a schematic view showing an example of a conventional assist bicycle.

FIG. 13 is a schematic view showing an example of a conventional assist bicycle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input shaft 1a Inclined part 1c Inner ring 2 Output shaft 3 Rotating body 3a Outer ring 6 Housing 8 Bearing 19 Axle shaft 21 Outer housing 21a Disc-shaped flange 21b Hole for fixing rim 24 One-way clutch

Claims (7)

[Claims] A _{first member} having a number of teeth fixed to the housing;
A fourth gear having a number of teeth n ₄ attached to the output shaft;
Match the respective axis of the input shaft is disposed, a second number of teeth n ₂
A rotating body integrally provided with a gear and a third gear having the number of teeth n ₃ is supported by the inclined portion of the input shaft so that the second gear meshes with the first gear and the third gear meshes with the fourth gear. XY having a point at which a center point of a common spherical surface passing through each pitch circle of the first and second gears coincides with a central point of a common spherical surface passing through each pitch circle of the third and fourth gears. The axis of the input shaft is arranged on the X axis of the coordinates, and the mesh points of the first and second gears and the mesh points of the fourth and third gears are placed on the same quadrant or different quadrants of the XY coordinates. A two-wheeled vehicle, comprising a Coriolis motion gear device as a reduction gear, and an electric in-wheel motor having a wheel hub driven by the output shaft in an outer housing as a power source. 2. The two-wheeled vehicle according to claim 1, wherein the bearing that supports the rotating body with respect to the inclined portion of the input shaft is a four-point contact ball bearing. 3. The two-wheeled vehicle according to claim 1, wherein an outer ring of a bearing that supports the rotating body with respect to the inclined portion of the input shaft is integrally formed with the rotating body. 4. The motorcycle according to claim 1, wherein a one-way clutch is interposed between the output shaft and the outer housing. 5. The motorcycle according to claim 1, wherein the in-wheel motor is provided on a front wheel. 6. The motorcycle according to claim 1, wherein the motorcycle is a motorcycle. 7. The two-wheeled vehicle according to claim 1, wherein the two-wheeled vehicle is an assisted bicycle.