JP2001115850A - Engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lighten weight and reduce a cost in a connecting structure of a generator to a crankshaft also make even miniaturization capable of an engine total unit, in an engine provided with the generator constituted by a rotor formed by securing a magnet to an inner surface of a bowl-shaped flywheel coaxially connected to the crankshaft and a stator fixedly arranged in the inward of this rotor. SOLUTION: A flywheel 65 is integrally formed in a balance weight 37a integrally provided in a crankshaft 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a rotor having a magnet fixed to an inner surface of a bowl-shaped flywheel coaxially connected to a crankshaft, and a stator fixedly disposed inside the rotor. The present invention relates to an engine including a generator to be used.

[0002]

2. Description of the Related Art Conventionally, such an engine is well known, for example, in Japanese Utility Model Laid-Open No. 4-32269.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
The flywheel of the generator is coaxially tapered to one end of the crankshaft and fastened with multiple bolts, so the number of parts is relatively large, and the work of attaching the flywheel to the crankshaft is also required. As a result, the manufacturing cost is increased. In addition, not only is it necessary to control the shape accuracy of the tapered fitting portion in order to prevent the loosening of the fastening portion due to fluctuations in the rotation of the engine, but it is unavoidable to increase the weight for securing the rigidity of the fastening portion. Further, the generator is disposed outside a support member such as a crankcase that supports one end of the crankshaft, which causes an increase in the size of the entire engine.

The present invention has been made in view of the above circumstances, and provides an engine capable of reducing the weight and cost of a structure for connecting a generator to a crankshaft and reducing the size of the entire engine. The purpose is to:

[0005]

In order to achieve the above object, according to the present invention, there is provided a rotor in which a magnet is fixed to an inner surface of a bowl-shaped flywheel coaxially connected to a crankshaft; In an engine provided with a generator including a stator fixedly disposed inside the rotor, the flywheel is formed integrally with a balance weight provided integrally with the crankshaft.

According to this configuration, since the flywheel is formed integrally with the balance weight, the number of parts is small, and the flywheel is not required to be attached. In addition, since the fastening portion is unnecessary, it is not necessary to secure the rigidity of the fastening portion, and it is possible to reduce the weight of the connection structure. In addition, the generator can be arranged on the inner side of a support member such as a crankcase that supports one end of the crankshaft, so that the size of the entire engine can be reduced.

[0007] The invention according to claim 2 provides the above-described claim 1.
In addition to the configuration of the invention described above, at least a part of a bearing provided between one end of the crankshaft and a support member is disposed radially inward of the stator. The axial length of the crankshaft can be reduced, and the size of the entire engine can be further reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on one embodiment of the present invention shown in the attached drawings.

1 to 10 show an embodiment of the present invention. FIG. 1 is a partially cutaway side view of a bicycle with an auxiliary engine, and FIG. 2 is a transverse sectional view of the engine. 2-2
3 is a sectional view taken along the line 3-3 in FIG. 2, FIG. 4 is a sectional view taken along the line 4-4 in FIG. 3, FIG. 5 is a perspective view of the holder, and FIG. 7, FIG. 7 is a longitudinal sectional view of the first one-way clutch, FIG. 8 is a view for explaining power transmission / interruption between the starting driven gear and the input member, and FIG. 9 is an enlarged sectional view along line 9-9 in FIG. 10 is a sectional view taken along line 10-10 of FIG.

Referring to FIG. 1, a body frame 15 of a bicycle with an auxiliary engine has a head pipe 16 at a front end thereof.
A down frame 17 extending rearward and downward from the head pipe 16, and a seat post 18 extending upward from the upper rear end of the down frame 17 in parallel with the head pipe 16.
And a cover 19 fastened to the upper part of the down frame 17
The head pipe 16, the down frame 17, and the seat post 18 are integrally formed of an aluminum alloy or the like.

The head pipe 16 has a front fork 2
A front wheel WF is pivotally supported at the lower end of the front fork 20, and a steering handle 21 is provided at the upper end of the front fork 20. A rear wheel WR is pivotally supported between the rear ends of a pair of left and right rear forks 22 extending rearward from the rear end of the down frame 17. A pair of left and right stays 23 are provided between the rear ends.

The seat post 18 is formed in a tubular shape, and the support pipe 24 is inserted into the seat post 18 from above, and is fixed to the seat post 18 so that the vertical position can be adjusted. In addition, a saddle 25 for the driver to sit on is mounted on the upper end of the support pipe 24.

At the rear of the down frame 17, a pedal shaft 26 is rotatably supported. On both ends of the pedal shaft 26, foot pedals 27 for the driver sitting on the saddle 25 to step on the down frame 17 are provided. 17 so as to be arranged on both sides. In addition, a driving sprocket 28 is arranged coaxially with the pedal shaft 26 on the right side of the down frame 17 in a state where the bicycle with the auxiliary engine faces forward in the running direction, and a driven sprocket 29 coaxially provided with the rear wheel WR is provided. An endless chain 30 is wound around the driving sprocket 28.

Below the down frame 17 in the vehicle body frame 15, an engine 31 for exerting power to drive the rear wheel WR in the forward direction is provided so that a part of the down frame 17 is a component.

Referring to FIGS. 2, 3 and 4 together,
The cylinder block 32 of the engine 31 is arranged such that the axis of a cylinder bore 33 provided in the cylinder block 32 is substantially horizontal along the longitudinal direction of the bicycle. A cylinder head 34 arranged in front of the cylinder block 32 has Crankcase 3 coupled to cylinder block 32 and arranged behind cylinder block 32
5 is connected to the cylinder block 32.

A crankshaft 37 having an axis extending in the width direction of the bicycle is connected to a piston 36 slidably fitted in the cylinder bore 33 via a connecting rod 38. The crankcase 35 accommodating the crankshaft 37 includes an upper case 39 formed at a rear portion of the down frame 17 and a lower case 40 connected to each other via a holder 42. The division surface 41 of 40 is set in parallel with the axis of the cylinder bore 33 and the axis of the crankshaft 37.

Referring also to FIG. 5, the holder 42 includes right and left holder members 43, 44 arranged substantially parallel to the axis of the cylinder bore 33 in the cylinder block 32, and right and left holder members 43, 44. And a connecting member 45 for connecting the front ends of the connecting members 44.

The front ends of the right and left holder members 43 and 44 and the connecting member 45 are connected to each other by two pairs of bolts 4.
6, 46 and nuts 47, 47 are mutually fastened.
The connecting member 45 has an insertion hole 4 through which a part of the cylinder block 33 is formed.
The cylinder block 32 and the cylinder head 34 are arranged around the cylinder bore 33 and
Are screwed into the connecting member 45. That is, the through bolts 49, 49 ...
Thereby, the connecting member 45 of the holder 42, the cylinder block 32, and the cylinder head 34 are fastened together. The cylinder head 34 is fastened to the cylinder block 32 by one or a plurality of sets of bolts 50 and nuts 51 at a position away from the tightening position by the through bolts 49.

On the upper portions of the right and left holder members 43, 44, a plurality of, for example, three, to-be-fastened portions 52, 52,.
Are provided at an interval in the front-rear direction of the bicycle with the auxiliary engine, and these fastened portions 52, 52... Are formed at the rear portion of the down frame 17 in the upper case 39.
Are fastened with bolts 53, 53, respectively. Further, support legs 54, 55 extending downward are provided below the right and left holder members 43, 44, and the lower case 40 is provided with bolts 56, 57 on the support legs 54, 55.
Is concluded. That is, the lower case 40 is connected to the cylinder block 32 and the upper case 3 via the holder 42.
9 supported. Moreover, a gasket 58 interposed between the upper case 39 and the cylinder block 32 is mounted on the upper end of the lower case 40.

Left holder member 44 of holder 42
Has a function as a support member for supporting one end of the crankshaft 37. One end of the crankshaft 37 is supported by a stepped cylindrical shaft support member 59 fixed to the left holder member 44. And is rotatably supported via a ball bearing 60. The other end of the crankshaft 37 rotatably penetrates the right holder member 43 of the holder 42, and a ball bearing 61 is provided between the right holder member 43 and the crankshaft 37.

A generator 62, which is rotationally driven by a crankshaft 37, is disposed inside the left side holder member 44.
And a stator 64 fixedly arranged inside the rotor 63.

The rotor 63 has a bowl-shaped flywheel 65.
The flywheel 65 is formed integrally with the left balance weight 37b of the pair of balance weights 37a and 37b provided integrally with the crankshaft 37.

The stator 64 includes the crankshaft 3
A coil 69 is wound around a ring-shaped stator core 67 coaxially surrounding the coil 7 with a bobbin 68 interposed therebetween.
It is fixed to the shaft support member 59 on the more inward side. As a result, at least a part (a part in this embodiment) of the ball bearing 60 interposed between one end of the crankshaft 37 and the left holder member 44 is disposed radially inward of the stator 64. .

The engine 31 is of a so-called side valve type, and a combustion chamber 71 facing a part of the top of the piston 36 is positioned rightward from the axis of the cylinder bore 33 in a posture facing forward in the front-rear direction of the bicycle. It is formed between the cylinder block 32 and the cylinder head 34 such that the center is located at a position shifted from the cylinder block 32. The cylinder head 34 has a spark plug 7 having an inner end facing the combustion chamber 71.
2 is attached.

An intake port 73 that can communicate with the combustion chamber 71 is provided above the cylinder block 32, and an exhaust port 74 that can communicate with the combustion chamber 71 is provided below the cylinder block 32.

An intake valve 75 for switching communication between the intake port 73 and the combustion chamber 71 and an exhaust valve 76 for switching communication between the exhaust port 74 and the combustion chamber 71 are provided.
Opening / closing operation is enabled and supported by the cylinder block 32, and is spring-biased in the valve closing direction.

The intake valve 75 and the exhaust valve 76 are driven to open and close by a valve mechanism 77. The valve train 77
A timing drive gear 78 fixed to a protruding end of the crankshaft 37 from the right holder member 43 and a timing rotatably supported by a support shaft 79 fixed to the right holder member 43 to mesh with the timing drive gear 78. A driven gear 80, a cam 81 formed integrally with the timing driven gear 80, and supported by the cylinder block 32 so as to swing following the cam 81 and interlocked and connected to the intake valve 75. Intake side rocker arm 82
And an exhaust-side rocker arm 83 that is supported by the cylinder block 32 so as to swing in accordance with the cam 81 and is interlocked with and connected to the exhaust valve 76.

The upper end of the cylinder block 32 is connected to a downstream end of an intake pipe 84 communicating with the intake port 73.
The upstream end of the intake pipe 84 is connected to the downstream end of a carburetor 85 that is arranged above the engine 31 so as to partially house the down frame 17 in the body frame 15.

The down frame 17 of the body frame 15 is formed to have a substantially U-shaped cross-sectional shape with the upper part opened, and the cover 19 is closed so as to close the upper open end of the down frame 17. Is fastened to the down frame 17.

Between the down frame 17 and the cover 19, there are formed an intake chamber 86 connected to the upstream end of the carburetor 85 and a storage chamber 87 arranged on the front side of the intake chamber 86. A fuel tank 88 is stored in the storage room 87,
The fuel injection pipe provided in the fuel tank 88 protrudes upward through the cover 19, and a cap 89 is detachably attached to the upper end of the fuel injection pipe.

The cover 19 and the down frame 17 constitute an air cleaner case 91 between the storage chamber 87 and the intake chamber 86. The air cleaner 90 is accommodated in the air cleaner case 91 so that the cleaner cleaner 92 is accommodated therein. Is configured. Thus, the air cleaner 90
Inside, outside air is introduced from the storage chamber 87 side, and the air purified by the air cleaner 90 is guided to the intake chamber 86.

The lower end of the cylinder block 32 is connected to the upstream end of an exhaust pipe 93 communicating with the exhaust port 74.
The exhaust pipe 93 extends rearward below the engine 31 and is connected to an exhaust muffler 94 (see FIG. 1) disposed between the engine 31 and the rear wheel WR.

In FIG. 6, one end of the pedal shaft 26 is connected to the ball bearing 9 on the left side wall of the upper case 39 of the crankcase 35 along the longitudinal direction of the bicycle.
5 is rotatably supported. Also, on the right side wall of the upper case 39 along the longitudinal direction of the bicycle,
An outer end of a rotary cylinder shaft 96 that coaxially surrounds the other end of the pedal shaft 26 is rotatably supported via a ball bearing 97, and an inner end of the rotary cylinder shaft 96 is relatively moved by the pedal shaft 26. A roller bearing 98 is rotatably supported between the outer end of the rotary cylinder shaft 96 and the pedal shaft 26. That is, the coaxial pedal shaft 26 and the rotary cylinder shaft 96 are supported by the upper case 39 of the crankcase 35 so as to be capable of relative rotation, and the driving sprocket 28 is fixed to the outer end of the rotary cylinder shaft 96.

The engine 31 is capable of providing forward rotation power to the rear wheel WR. Power transmission means 100 is provided between a crankshaft 37 of the engine 31 and a rotary cylinder shaft 96 which rotates together with the driving sprocket 28. Provided.

The power transmission means 100 includes a primary drive gear 101 fixed to a balance weight 37b of the crankshaft 37, and a primary drive gear 101
, And a centrifugal clutch 105 that connects the input member 103 and the output member 104 that rotate integrally with the primary driven gear 102 according to the rotation speed of the input member 103 that is equal to or higher than the set rotation speed.
A secondary drive gear 106 that rotates integrally with the output member 104; a secondary driven gear 107 that meshes with the secondary drive gear 106; And

Right and left holder members 4 of holder 42
A support shaft 109 having an axis parallel to the crankshaft 37 is provided between the centrifugal clutch 10 and the crankshaft 37.
5 input member 103 and output member 104
It is rotatably supported at 9. Thus, the primary driven gear 102 is formed on the outer periphery of the input member 103, and the secondary drive gear 106 is coaxially fixed to the output member 104.

The first planetary gear mechanism 108 includes a sun gear 110 formed integrally with the secondary driven gear 103 and rotatably supported on the rotary cylinder shaft 96, and a rotary cylinder shaft 96.
A ring gear 111 engaged with the support shaft 109 so as to prevent rotation about the axis of the sun gear 11;
Are rotatably supported by a plurality of, for example, three planetary gears 112 meshing with the ring gear 111.
And a carrier 113 integrally formed.

According to such a power transmission means 100,
After the engine 31 is started, the centrifugal clutch 105 is connected according to the rotation speed of the engine 31 exceeding the set rotation speed, and the rotational power of the engine 31 is transmitted to the power transmission means 1.
At 00, the speed is transmitted to the rotary cylinder shaft 96 and the driving sprocket 28, and the rear wheel WR is driven to rotate in the forward direction by the output of the engine 31.

The input member 103 of the centrifugal clutch 105 is always connected to the engine 31. By transmitting a rotational operating force from the foot pedal 27 in the forward direction to the input member 103, the engine 3
1 can be started. Moreover, the engine 31
In order to switch between a state in which the vehicle is started and a state in which the rear wheel WR is driven in the forward direction only by the rotational operation force of the foot pedal 27, the rotational operation of the foot pedal 27 is performed before the engine 31 is started. The state in which force is transmitted to the input member 103, the foot pedal 27 and the input member 10
The power transmission switching means 115, which can switch between a state in which the three members are shut off by manual operation of the operation rod 151, is provided by the input member 1.
03 and the foot pedal 27.

The power transmission switching means 115 includes a second planetary gear mechanism 117 arranged coaxially with the pedal shaft 26,
First one-way clutch 118 provided between carrier 125 and pedal shaft 26 of second planetary gear mechanism 117
And a second one-way clutch 119 provided between the sun gear 122 of the first planetary gear mechanism 117 and the rotary cylinder shaft 96.
A starting drive gear 120 provided on the ring gear 123 of the second planetary gear mechanism 117, and a starting drive gear supported on the support shaft 109 at a position facing the input member 103 and meshed with the starting drive gear 120. Driven gear 121
And

The second planetary gear mechanism 11 has a sun gear 122 disposed coaxially with the pedal shaft 26 with a second one-way clutch 119 interposed between the rotary planetary shaft 96 and a driving gear 120 for starting. Sun gear 122
A ring gear 123 coaxially surrounding the
And a plurality of planetary gears 12 meshing with the ring gear 123
4 ... and a carrier 125 that rotatably supports them.

In FIG. 7, the first one-way clutch 118
Has a clutch inner 127 splined to the pedal shaft 26, and a number of ratchet teeth 128, 128.
.. On the inner circumference and surrounds the clutch inner 127 and is formed integrally with the carrier 125 of the second planetary gear mechanism 117, and the clutch inner 12 is made engageable with the ratchet teeth 128, 128,.
7 and a pair of engaging pieces 130, 130 arranged between the clutch outer 129 and the engaging pieces 1
A holding ring 131 is provided for holding the clutch members 30 and 130 on the clutch inner 127 side.

According to the first one-way clutch 118, when the pedal shaft 26 rotates in the forward rotation direction (forward direction) indicated by the arrow 132, the two engagement pieces 130, 1
By engaging the ratchet teeth 128, 128 with the ratchet teeth 128, the rotational power in the forward direction from the pedal shaft 26 can be transmitted to the clutch outer 129, that is, the carrier 125. When rotating in the reverse direction (reverse direction), the first one-way clutch 118 is in the power cutoff state, and the pedal shaft 26 idles.

The second one-way clutch 119 is spline-coupled to the sun gear 122 of the second planetary gear mechanism 117 and is rotatably supported on the rotary cylinder shaft 96. The clutch inner 133 is spline-coupled to the rotary cylinder shaft 96. And a clutch outer 134 surrounding the clutch inner 133, and is configured similarly to the first one-way clutch 118, and transmits rotational power of the sun gear 122 in the forward direction to the rotary cylinder shaft 96 and When the rotation of the shaft 96 is forcibly stopped by the braking of the rear wheel WR, the rotation of the sun gear 122 also stops. When the rotation speed of the rotary cylinder shaft 96 exceeds the rotation speed of the sun gear 122, the sun gear 122 It works to idle.

The starting drive gear 12 integrally formed on the outer periphery of the ring gear 123 in the second planetary gear mechanism 117
0 is engaged with the centrifugal clutch 1
Between the input member 103 of the holder 05 and the left holder member 44 of the holder 41 in the axial direction.
09 is rotatably supported.

The input member 10 of the starting driven gear 121
8, a plurality of ratchet teeth 135, 135,... Are provided on an end face facing the start gear 3, and ratchet teeth 136, 136,. . Moreover, the ratchet teeth 135, 135,..., 136, 136... Move the driven member 121 for starting from the position shown in FIG.
As shown in FIG. 8 (b), the gears are formed so as to mesh with each other by advancing to the third side, and the driven gear 121 for rotation rotates in the normal rotation direction indicated by the arrow 137 while meshing with each other. In this case, the input member 103 is
Is transmitted from the starting driven gear 121 to the input member 103.
The starting power is transmitted from the engine 03 to the engine 31. On the other hand, when the engine 31 is started, the input member 1
8 rotates in the direction indicated by the arrow 137 as shown in FIG. 8C, the ratchet teeth 135, 135,.
36, 136... Indicate the start driven gear 121 by an arrow 138.
As shown by, it functions to retreat so as to separate from the input member 103.

A rotation restricting plate 139 is fixed to the inner surface of the left holder member 44. When the driven gear 121 is in a retracted position away from the input member 103, the rotation restricting plate 139 is located on the left side of the driven gear 121. The outer periphery of the end of the holder member 44 is connected to the rotation regulating plate 13 via a spline 140.
9 is fitted. That is, when the driven gear 121 for start moves to the retracted position separated from the input member 103, the rotation of the driven gear 121 about the axis is controlled by the rotation restricting plate 1.
Blocked by 39.

The two ratchet teeth 135, 135,.
36, 136... Are driven forward to the input member 103 side, and the start driven gear 1 is rotated until the rotation is restricted by the rotation restricting plate 139.
In order to obtain a sense of moderation when moving the driven gear 121 for starting in the axial direction between the state in which the driven gear 21 is retracted in the direction away from the input member 103, A click mechanism 141 is provided.

Referring also to FIG. 9, the click mechanism 14
1 is a pair of annular grooves 142, 143 provided at axially spaced positions on the inner surface of the starting driven gear 121;
A sphere 144 held on the support shaft 109 so that a part of the sphere 144 can be fitted into either of the annular grooves 142 and 143.
And a spring 145 provided between the spherical body 144 and the support shaft 109.

Referring also to FIG. 10, an annular engaging groove 14 is formed on the outer surface of the axially intermediate portion of the driven driven gear 121 in the axial direction.
7 are provided, and the shifter 148 is
21 are engaged with the engagement grooves 147 from both sides. A pair of brackets 149, 14 provided on the rotation regulating plate 139
9, a shaft 150 having an axis perpendicular to the axis of the support shaft 109
Are supported at both ends, and the shifter 148 is
It is pivotable about 50 axes.

Arm 14 provided integrally with shifter 148
8a is connected to one end of an operation rod 151 extending in a direction perpendicular to the axis of the support shaft 109 and the shaft 150. The operation rod 151 allows the upper case 39 to move in an airtight and longitudinal direction. An operation knob 152 is provided at the other end of the operation rod 151, that is, at the upper end thereof.

When the operating rod 151 is pushed downward, the shifter 148 rotates around the axis of the shaft 150, and the starting driven gear 121 is driven by the ratchet teeth 135, 135,.
136, 136... Move forward to the input member 103 side so as to mesh with each other.

According to the power transmission switching means 115, the operation rod 151 is pushed downward to move the start driven gear 121 forward toward the input member 103, and the ratchet teeth 135, 135, 136, 136,. When the foot pedals 27 are rotated in the normal rotation direction, that is, in the direction of rotating the rear wheels WR in the forward direction, in a state where the rear wheels WR are braked by the brake operation while being engaged with each other, the rotational power of the foot pedals 27. Is increased by the second planetary gear mechanism 117 and transmitted from the start drive gear 120 to the start driven gear 121, and further to the input member 103 via the ratchet teeth 135, 135, 136, 136,. Will be communicated. That is, in the second planetary gear mechanism 117, the second one-way clutch 119 is attached to the rotary cylinder shaft 96 whose rotation is stopped by braking of the rear wheel WR.
The rotation of the sun gear 122 connected via the pedal is also stopped, and the rotational power from the pedal shaft 26 that rotates together with the foot pedals 27 is input to the carrier 125 via the first one-way clutch 118 to start the vehicle. The ring gear 123 integral with the driven gear 121 is amplified and rotated in the normal rotation direction.

When the input member 103 is the foot pedal 27.
, The rotational power from the input member 103 is transmitted to the crankshaft 37 of the engine 31 via the primary driven gear 102 and the primary drive gear 101, whereby the engine 31 starts.

When the engine 31 is started, the input member 1
When the engine 03 is driven to rotate by the engine 31, the ratchet teeth 135, 135, 136, 136, 136 between the driven driven gear 121 and the input member 103 separate the driven driven gear 121 from the input member 103. The starting driven gear 121 automatically moves backward to a position where rotation is regulated by the rotation regulating plate 139 while pushing up the operating rod 151 upward, so as to release the mutual meshing state.

When the bicycle is to be run only by human power, the foot pedal 2 can be used without pushing the operation rod 151.
7. In this case, the starting driven gear 1
Reference numeral 21 denotes a state in which rotation is stopped by the rotation restricting plate 139, and the ring gear 123 of the second planetary gear mechanism 117 is
The driven driven gear 120 integrated with the ring gear 123
The rotation is stopped by the engagement with the driven gear 121 for start. Therefore, the first from the pedal shaft 26
The rotational power in the normal rotation direction input to the carrier 125 via the one-way clutch 118 is transmitted to the sun gear 122 at an increased speed without being transmitted to the input member 103 side.
The power is transmitted to the rotary cylinder shaft 96 via the one-way clutch 119.

That is, the power transmission switching means 115 transmits the rotational operation force of the foot pedals 27 in the normal rotation direction to the input member 103 connected to the engine 31 before starting the engine 31 and also transmits the rotational operation force to the rotary cylinder shaft 96. , And the input member 1
The state in which the operating rod 151 is manually operated can be switched between a state in which the space between the operating rod 151 and the state in which the rotation operation force of the foot pedals 27 in the normal rotation direction is transmitted to the rotary cylinder shaft 96 is cut off.

Paying particular attention to FIG. 3, the lower end opening of the seat post 18 is closed by a breather cap 154, and the breather cap 154 is
Plate 1 fastened to upper case 39 which is a constituent element of
55 and the upper case 39. In addition, a maze 156 is formed between the breather cap 154 and the holding plate 155 so that one end of the maze 156 communicates with the crankcase 35. The entrained oil of the breather gas generated in the crankcase 35 is separated while passing through the maze 156. Is done. The breather cap 154 has the maze 15
One end of a hose 157 communicating with the hose 6 is connected, and the other end of the hose 157 is connected upstream of the cleaner element 92 in the air cleaner 90.

Next, the operation of this embodiment will be described. Since the flywheel 65 of the generator 62 is formed integrally with the balance weight 37a provided integrally with the crankshaft 37, the flywheel 65 is connected to the crankshaft 37 of the generator 62. Can be configured at a low cost by reducing the number of parts and by eliminating the work of mounting the flywheel 65. In addition, since the fastening portion of the flywheel 65 to the crankshaft 37 is unnecessary, it is not necessary to secure the rigidity of the fastening portion. As a result, it is possible to reduce the weight of the connection structure and to support one end of the crankshaft 37. The generator 62 is arranged inside the left holder member 44 to reduce the size of the engine 31 as a whole.

Also, a part of the ball bearing 95 provided between one end of the crankshaft 37 and the left holder member 44 is disposed radially inward of the stator 64 in the generator 62, so that the axial length of the crankshaft 37 is increased. Therefore, the overall length of the engine 31 can be further reduced.

Further, between the input member 103 and the foot pedal 27.
Power transmission switching means 115 capable of switching between a state in which the rotational operation force of the foot pedals 27... Is transmitted to the input member 103 and a state in which the foot pedals 27. The engine 31 is started by the depressing operation of the foot pedals 27 unless the power transmission switching means 115 is manually operated to transmit the rotational operation force of the foot pedals 27 to the input member 103. Never. Therefore, the engine 31 can be started by the foot pedals 27 and the engine 31 can be started by a simple operation without special consideration for the operation of the foot pedals 27.

Further, the second planetary gear mechanism 117, which constitutes a part of the power transmission switching means 115, functions to increase the rotational operation force of the foot pedals 27 and transmit the rotational operation force to the rotary cylinder shaft 96 when the vehicle is driven only by human power. By providing the second planetary gear mechanism 117 with two functions, it is possible to reduce the number of components, and to reduce the number of components arranged around the pedal shaft 26 to reduce the number of components. 26, that is, the two-foot pedal 2
7 can be set narrower.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, in the above embodiment, the crankcase 3
5, a crankshaft 3
Although the description has been given of the engine 31 in which the crank 7 is rotatably supported, the present invention can be applied to an engine in which a crankshaft is rotatably supported on a crankcase.

[0065]

As described above, according to the first aspect of the present invention, it is possible to provide a low-cost connection structure of the generator to the crankshaft, which requires a small number of parts and does not require a flywheel mounting operation. It is also possible to reduce the weight of the connection structure. In addition, the generator can be arranged on the inner side of the supporting member that supports one end of the crankshaft, so that the size of the entire engine can be reduced.

According to the second aspect of the present invention, the length of the crankshaft in the axial direction can be reduced, and the size of the entire engine can be further reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a bicycle with an auxiliary engine.

FIG. 2 is a cross-sectional view of the engine, taken along line 2-2 of FIG. 3;

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is a perspective view of a holder.

FIG. 6 is an enlarged view of a main part of FIG. 2;

FIG. 7 is a longitudinal sectional view of a first one-way clutch.

FIG. 8 shows power transmission between a driven gear for starting and an input member.
It is a figure for explaining interruption.

FIG. 9 is an enlarged sectional view taken along line 9-9 of FIG. 2;

FIG. 10 is a sectional view taken along line 10-10 of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 31 ... Engine 37 ... Crankshaft 37a ... Balance weight 44 ... Left holder member as a support member 60 ... Ball bearing as a bearing 62 ... Generator 63 ... Rotor 64 ..Stator 65 ・ ・ ・ Fly wheel 66 ・ ・ ・ Magnet

Claims (2)

[Claims] A magnet (6) is provided on an inner surface of a bowl-shaped flywheel (65) coaxially connected to a crankshaft (37).
6) and a rotor (63) to which the rotor (6) is fixed.
3) In an engine provided with a generator (62) composed of a stator (64) fixedly disposed inward of the flywheel (37) and a balance weight (37a) integrally provided with the crankshaft (37). 65) wherein the engine is formed integrally. 2. A bearing (60) provided between one end of the crankshaft (37) and a support member (44) is disposed radially inward of the stator (64). The engine according to claim 1, wherein: