JPH0550976A - Arrangement structure of generator and fuel injection pump on motorcycle - Google Patents

Abstract

PURPOSE:To arrange a generator and a fuel injection pump compactly on a motorcycle and to cool the generator effectively with a simple structure. CONSTITUTION:In an autobicycle provided with a generator 80 interlocked to a crankshaft 34 of an engine 18, on an outer side of the body, and a fuel injection pump 108 supplying pressurized fuel to the engine 18, the fuel injection pump 108 is arranged in a space 80a below the generator 80.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for disposing a generator and a fuel injection pump in a motorcycle.

[0002]

2. Description of the Related Art In some motorcycles, a generator for generating electric power by interlocking with a crankshaft of an engine is provided on the outer side of a vehicle body, while a fuel injection pump for supplying pressurized fuel to the engine is provided. ..

[0003]

By the way, in motorcycles, in particular, since it is desired to make the vehicle body compact, it is required to arrange these generators and fuel injection pumps compactly. ing. Further, since the power generation efficiency of the generator decreases when the temperature becomes high, it is required to cool the generator with a simple structure and efficiently.

[0004]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to the above circumstances, and in a motorcycle, a generator and a fuel injection pump are compactly arranged, and
An object of the present invention is to allow the generator to have a simple structure and to be cooled effectively.

[0005]

The feature of the present invention for achieving the above object is that the fuel injection pump is arranged in the space below the generator provided on the outside of the vehicle body. is there. Further, in the above structure, a drive gear that is always interlocked with the crankshaft may be disposed on the bottom side inside the generator case that forms the outer shell of the generator, and the lubricating oil may be scattered by this drive gear. Further, the drive gear may be for driving a fuel injection pump.

[0006]

[Operation] The operation of the above configuration is as follows. In the motorcycle 1, the flywheel magneto (generator) 80 is usually provided outside the vehicle body. The fuel injection pump 108 is disposed in the space 80a below the flywheel magneto 80. Therefore, the space 80a below the flywheel magneto 80 is effectively used, and accordingly, the flywheel magneto 80 and the fuel injection pump 108 are compactly arranged.

Further, in the above structure, a sixth gear (driving gear) 114 which is always interlocked with the crankshaft 34 is disposed on the bottom side of the generator case 84 forming the outer shell of the flywheel magneto 80. 6-gear (driving gear) 11
4, the lubricating oil accumulated on the bottom side of the generator case 84 is scattered. Therefore, during operation of the engine 18, the lubricating oil is always scattered by the sixth gear (driving gear) 114, and the flywheel magnet 80 is constantly cooled by the scattered lubricating oil. In this case, the sixth gear (driving gear) 114 for driving the other machine is used for cooling the flywheel magneto 80, and the increase in the number of parts is suppressed.

The sixth gear (drive gear) 114 is for driving the fuel injection pump 108, and the sixth gear (drive gear) 114 is the fuel injection pump 10.
Due to the function of 8, it can be rotated at high speed. Therefore, the lubricating oil is effectively scattered.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 1 is a motorcycle, which is a vehicle, and an arrow Fr in the drawing indicates the front thereof. The body frame 2 of the motorcycle 1 has a head pipe 3 at the front end thereof, and a pair of left and right main frames 4 extend downward from the head pipe 3 rearward and downward from the rear end of each main frame 4. The rear arm bracket 5 extends toward. A front fork 7 is rotatably supported on the head pipe 3, a front wheel 8 is supported on the lower end of the front fork 7, and a handle 9 is mounted on the upper end.

The rear arm bracket 5 has a pivot shaft 1
The rear arm 11 is pivotally supported by 0 so that it can swing vertically. A rear wheel 12 is supported on the swinging end of the rear arm 11, and a shock absorber 13 is installed between the rear end of the main frame 4 and the rear arm 11. Further, the seat frame 1 protruding rearward and upward from the rear end of the main frame 4
5 is provided, and the seat 16 is provided on the seat frame 15.
Is attached.

An engine 18 is provided below the main frame 4, and the engine 18 is supported on the main frame 4 and the rear arm bracket 5 by bolts 19 as above. The engine 18 is a two-cylinder two-cycle engine. A left cylinder 21 projects from the left side of the crankcase 20 toward the front upper side, and a right cylinder 22 projects from the right side of the crankcase 20 toward the front lower side. The intersection angle of 21 and the right cylinder 22 is approximately 90 ° in a side view.

A power transmission device 24 is connected to the crankcase 20, and an output chain wheel 25 of the power transmission device 24 is provided.
A transmission chain 27 is wound around the input chain wheel 26 attached to the rear wheel 12. The power of the engine 18 is transmitted to the rear wheels 12 via the transmission chain 27 and the like, so that the motorcycle 1 can travel on the road surface 28. In addition, 30 is a fuel tank, 31 is an exhaust pipe, and 32 is a radiator.

In FIG. 3, a crankshaft 34 extending left and right is supported by the crankcase 20. The left cylinder 21 has a cylinder 35 projecting upward and upward from the crankcase 20, and a cylinder head 36 is attached to the projecting end of the cylinder 35. A piston 38 is slidably fitted in the cylinder 35 on its axis 37, and the piston 38 and the crankshaft 34 are connected by a connecting rod 39.

The output chain wheel 25, the cylinder head 36,
A space surrounded by the piston 38 is a combustion chamber 41. An intake port 42 is formed in the crankcase 20, and an intake pipe 43 is connected to the intake port 42. A scavenging port 44 that connects the intake port 42 to the combustion chamber 41 is formed in the cylinder 35. On the other hand, the same as above, an exhaust port 45 for penetrating the combustion chamber 41 to the outside.
The exhaust pipe 31 is connected to the exhaust port 45. The cylinder 35 and the cylinder head 36
A water jacket 46 is formed on the bottom.

A first fuel injection valve 48 is attached to the intake pipe 43. A second fuel injection valve 49 is attached to the cylinder head 36. This second
The fuel injection valve 49 is for injecting fuel into the combustion chamber 41. The combustion chamber 41 is of a so-called wedge type. The fuel injection direction of the second fuel injection valve 49 is substantially parallel to the axis 37. The shaft 37 is slightly deviated forward. Same as above, a first spark plug 50 is screwed to the cylinder head 36 near the rear of the second fuel injection valve 49, and a pair of left and right second fuel injection valves 50 are provided in front of the second fuel injection valve 49.
The spark plugs 51, 51 are screwed.

As shown in FIG. 3, the right cylinder 22 has a cylinder 53 projecting from the crankcase 20 toward the front lower side, and a cylinder head 54 is attached to the projecting end of the cylinder 53. A piston 56 is slidably fitted in the cylinder 53 on its axis 55. Further, as in the case of the left cylinder 21, the connecting rod 3
9, combustion chamber 41, intake port (not shown), intake pipe (not shown), combustion chamber 58, scavenging port 59, exhaust port 6
0, a third fuel injection valve (not shown) attached to the intake pipe, a fourth fuel injection valve 63, a third spark plug 64, and a fourth spark plug 65 are provided. In the above case, the fourth fuel injection valve 63 is for injecting fuel into the combustion chamber 58, and the combustion chamber 58 is of the so-called bathtub type (side blowing), and the fuel injection direction of the fourth fuel injection valve 63 is the same. Is in a direction substantially orthogonal to the axis 55 of the cylinder 53 and is directed downward. The third spark plug 64 extends substantially parallel to the axis 55, and the axis 55
Deviated slightly below.

1 and 3, the crankcase 20 comprises a crankcase body 68, and a left cover 69 and a right cover 70 attached to the left and right side surfaces of the crankcase body 68, respectively. A balancer shaft 72 extending parallel to the crankshaft 34 is provided above the crankshaft 34, and a left bearing 7 is provided on the crankcase body 68.
3 and a right bearing 74. A left weight 75 is attached to the left free end of the balancer shaft 72, and a right weight 76 is attached to the right free end. The first gear 77 attached to the right end of the crank shaft 34 and the second gear 78 attached to the right end of the balancer shaft 72 mesh with each other, and the crank shaft 34 rotates at the same speed and the balancer shaft rotates. 72. Then, the left weight 75 and the right weight 76, which are interlocked with the balancer shaft 72, cancel out vibrations that are about to occur when the engine 18 is driven.

Reference numeral 80 denotes a flywheel magneto which is a generator, and the flywheel magneto 80 is provided on the left side portion of the vehicle body. This flywheel magneto 80 is attached to the boss 82 and a stator 81 which is a coil coaxial with the crankshaft 34 and is screwed to the left end of the crankcase body 68, a boss 82 which is attached to the left end of the crankshaft 34. A rotor 83 as a magnet,
It is configured with a generator case 84 that covers these from the left outside of the vehicle body. The generator case 84 is formed by bulging a part of the left cover 69 toward the left side outward. Therefore, the flywheel magneto 80 has a shape projecting outward from the left side surface of the crankcase 20, and the space 80a therebelow is a surplus space. The output of the flywheel magneto 80 is used as a power source for each of the spark plugs and batteries.

The power transmission device 24 will be described with reference to FIGS. 1, 3 and 4. The power transmission device 24 has a transmission case 85 integrally formed at the rear end of the crankcase 20, and the transmission case 85 is the case body 8.
6, a left cover 87, and a right cover 88. An input shaft 89 and an output shaft 90 arranged in parallel with the crank shaft 34 are supported by the case body 86,
Both shafts 89, 90 are connected to each other by a speed change gear set 91.

A small reduction gear 93 attached to the right end of the crankshaft 34 and a large reduction gear 94 rotatably supported on the input shaft 89 mesh with each other, and the large reduction gear 94 and the input are connected. Multi-disc clutch 95 between the shaft 89
On the other hand, the output chain wheel 25 is attached to the left end of the output shaft 90. When the multi-disc clutch 95 is connected, the power of the engine 18 is transmitted from the crankshaft 34 to the small reduction gear 93, the large reduction gear 94, the multi-disc clutch 95, the input shaft 89, the transmission gear set 91, the output shaft 90.
To the output chain wheel 2 as described above.
5, transmitted to the front wheels 8 via the transmission chain 27 and the input chain wheel 26.

A pump shaft 97 is provided in front of and below the input shaft 89 in parallel therewith, and the pump shaft 97 is supported by the case body 86. A third gear 98 attached to the input shaft 89 and a fourth gear 99 attached to the right end of the pump shaft 97 mesh with each other, and the input shaft 89
Is transmitted to the pump shaft 97 at substantially the same speed. 1
00 is an oil pump, and this oil pump 100 is composed of a casing 101 and a rotor 102 attached to the pump shaft 97 in the casing 101. Then, the oil pump 100 is rotated by the rotation of the pump shaft 97, and the crankcase 20 and the transmission case 8 are provided.
5 Lubricating oil at the bottom is sucked and discharged, and is supplied to a predetermined lubricated portion.

Reference numeral 104 denotes a water pump.
Is composed of a casing 105 and a rotor 106 attached to the left end of the pump shaft 97 in the casing 105. The water pump 104 sucks the cooling water 107 from the radiator 32 by the amount of rotation of the pump shaft 97, and sucks the cooling water 107 into the water jackets 46, 61.
To cool each cylinder 21, 22. Further, the cooling water 107 after this is returned to the radiator 32 to be air-cooled, and is again sucked into the water pump 104. Reference numeral 108 denotes a trochoidal type fuel injection pump, which includes a casing 109 screwed to the outer surface of the left cover 87, a fuel pump shaft 1 supported by the case body 86 and the left cover 87.
10 and the fuel pump shaft 1 in the casing 109.
The rotor 111 is linked to the left end of the rotor 10.

A fifth gear 112 attached to the left end portion of the pump shaft 97 and a sixth gear 114 attached to the fuel pump shaft 110 via a first one-way clutch 113 mesh with each other. The 6th gear 114 is a drive gear that is always interlocked with the crankshaft 34.
The power of the pump shaft 97 is the fifth gear 11
2, sixth gear 114, and first one-way clutch 1
It is transmitted to the fuel pump shaft 110 via 13 and the fuel injection pump 108 is driven.

When the fuel injection pump 108 is driven,
This sucks the fuel 115 in the fuel tank 30 and discharges the fuel 115 to supply the pressurized fuel 116 to each of the fuel injection valves. In the above case, the pressurized fuel 116 is first supplied to the second fuel injection valve 49 and the fourth fuel injection valve 63, and then depressurized via the regulator (not shown) to make it the first fuel injection valve 48 and the first fuel injection valve 48. 3 fuel injection valve.

The fuel injection pump 108 is provided by effectively utilizing the space 80a below the flywheel magneto 80, that is, these are compactly arranged. Further, the fuel injection pump 108 is located below the flywheel magneto 80 and is located on the left cover 8.
7 protrudes outward from the outer surface of 7. Therefore, the fuel injection pump 108 is sufficiently cooled by the traveling wind without being hindered by the flywheel magneto 80.

Further, a heat insulating material 117 is provided between the casing 109 of the fuel injection pump 108 and the left cover 87, and in this respect also, the temperature of the fuel injection pump 108 is reliably prevented from becoming high. It Further, the fuel injection pump 108 is adjacent to the water pump 104 and both are provided on the left side of the transmission case 85. Therefore,
There is an advantage that these can be easily maintained and inspected intensively.

A piston type air pump 118 is attached to the outer surface of the right cover 88. The air pump 118 receives power from the large reduction gear 94 and is driven through a speed increasing gear set 119. When the air pump 118 is driven, it sucks outside air and discharges it to supply the pressurized air 122 to the fuel injection valves.

Each fuel injection valve supplied with the pressurized fuel 116 and the pressurized air 122 supplies the pressurized fuel 116 and the pressurized air 122 to the combustion chambers 41, 58 of the engine 18 or the intake pipe in a predetermined manner. The fuel is injected into the combustion stroke of the engine 18 at approximately the same crank angle or with a slight time lag.

In the above case, the cylinder 120 of the air pump 118 is located on the outer side of the crankcase body 68 and protrudes rearward. A cooling fin 121 is formed on the outer surface of the cylinder 120. For this reason,
Since the air pump 118 is sufficiently cooled by traveling wind, the compression efficiency of the air pump 118 is improved. Further, since the air pump 118 serving as a vibration source is arranged on the lower side of the engine 18, the vibration of the rider on the seat 16 is reduced.

In FIG. 1, a starting device 124 for the engine 18 is provided. The starting device 124 has a starter motor 125 which is a starter motor, and the starter motor 125 is attached to a lower portion of the crankcase body 68. A seventh gear 126 is formed on the output shaft of the starter motor 125. On the other hand, an eighth gear 127 is rotatably supported on the crankshaft 34, and the eighth gear 127 is linked to the seventh gear 126 by a reduction gear set 129. In addition, the eighth
A one-way clutch 128 that transmits power only from the gear 127 to the crankshaft 34 via the boss 82 is provided.

Then, when the starter motor 125 is driven at the time of starting the engine 18, the power thereof is transmitted through the seventh gear 126, the reduction gear set 129, the eighth gear 127, the one-way clutch 128, and the boss 82. It is transmitted to the crankshaft 34 and cranking is performed. A second one-way clutch 131 is attached to the fuel pump shaft 110.
The ninth gear 132 is supported via the
The second gear meshes with the seventh gear 126.

When the starter motor 125 is driven as described above when the engine 18 is started, the fuel injection pump 108 is driven via the ninth gear 132, the second one-way clutch 131, and the fuel pump shaft 110. It has become so. At the time of this start, the fuel injection pump 108 supplies the fuel injection valve 108 with a sufficient amount and pressure of the pressurized fuel 116 to each of the fuel injection valves.
The rotation speed is set so that the fuel is prevented from running short at the time of starting and a smooth starting can be obtained. That is, in this embodiment, the fuel injection pump 10
8 is configured to rotate faster at the time of starting than when the normal engine 18 that is driven by the crankshaft 34 is driven. Therefore, even at the time of starting, the pressure of the pressurized fuel 116 overcomes the pressure in each of the combustion chambers 41 and 58 and the pressure of each of the pressurized air so that a predetermined amount of the pressurized fuel 116 can be injected. Has been done.

When the normal driving of the engine 18 is started by the above start, the power of the crankshaft 34 is used instead of the starter motor 125 as described above through the first one-way clutch 113. 1
08 and the air pump 118, the engine 18
The pressurized fuel 116 and the pressurized air 122 corresponding to the number of revolutions are supplied to the combustion chambers 41, 58 and the intake pipe of the same through the fuel injection valves, and in this way from the start to the normal driving state. The transition will be smooth.

Further, in the above case, since the oil pump 100 and the water pump 104 are interposed in the power transmission system from the crankshaft 34 side to the first one-way clutch 113, for example, the engine 18 is suddenly decelerated. At this time, the power of the engine 18 is the oil pump 100.
Also, the power transmitted to the fuel injection pump 108 is rapidly reduced by the amount consumed by the water pump 104, and accordingly, the pressurized fuel 116 supplied to the combustion chambers 41, 58 is also rapidly reduced by the fuel injection pump 108. Thus, the rapid deceleration of the engine 18 is effectively performed.

A rotary encoder 134 is arranged on the right side of the crankcase 20, and the rotary encoder 134 is detachably screwed to the right cover 70 of the crankcase 20 from the outside by a bolt 135. A tenth gear 136 is formed on the right end of the balancer shaft 72, while an eleventh gear 138 is attached to the input shaft 137 of the rotary encoder 134.
The gear 136 and the eleventh gear 138 mesh with each other. In this case, the eleventh gear 138 has a non-backlash mechanism so that rattling does not occur in the mesh.

When the engine 18 is driven, the balancer shaft 72 rotates at the same speed in synchronization with the crank shaft 34, and the rotary encoder 134 operates via the tenth gear 136 and the eleventh gear 138, and the rotary encoder 134 operates. The encoder 134 is adapted to detect the crank angle and the top dead center. Then, based on this detection signal, the injection timing and period of each fuel injection valve are determined, and the ignition timing of each ignition plug is determined.

In the above structure, a structure for cooling or lubricating each part with lubricating oil will be described. A part of the lubricating oil 139 discharged from the oil pump 100 is injected into the flywheel magnet 80 by the nozzle 140 attached to the upper portion of the generator case 84. And this lubricating oil 139
Is the flywheel magneto 80 or the water pump 104
The fifth gear 112, the first one-way clutch 113, the sixth gear 114, and the starter 1
Lubricate each gear of 24 and the like.

A sixth gear 114, which is always interlocked with the crankshaft 34, is provided in the vicinity of a connecting portion between the bottom of the crankcase 20 on the bottom side of the generator case 84 and the bottom of the transmission case 85.
And the sixth gear 114 allows the lubricating oil 1
The lubricating oil accumulated on the bottom of the crankcase 20, the crankcase 20 and the transmission case 85 is scattered. For this reason,
During operation of the engine 18, the lubricating oil is constantly scattered by the sixth gear 114, and the flywheel magnet 80 and the like are constantly cooled and lubricated by the scattered lubricating oil. In this case, since the sixth gear 114 for driving the other machine is used for the cooling and the lubrication, and the increase in the number of parts is suppressed, the cooling and the lubrication are achieved by a simple configuration. ..

The sixth gear 114 is used to drive the fuel injection pump 108.
The gear 114 is rotated at a high speed because of the function of the fuel injection pump 108. Therefore, the lubricating oil is effectively scattered, and thus the cooling and lubrication are effectively performed.

1, 5, and 6, the crankshaft 34 is supported on the crankcase main body 68 by a left bearing 141, a middle bearing 142, and a right bearing 143, and the middle bearing 142 and the right bearing 143 are supported. Further, a part of the lubricating oil discharged from the oil pump 100 is supplied to the lubricating oil 144.

Since the constructions of supplying the lubricating oil 144 to the middle bearing 142 and the right bearing 143 are substantially the same, only those relating to the right bearing 143 will be described in detail with reference to FIGS. 5 and 6. The crankshaft 34 is a crankpin 145 that is rotatably fitted to the connecting rod 57.
And a left web 146 and a right web 147 located on the left and right of the connecting rod 57. The crank pin 14
5 is integrally molded with the left web 146, and the same protruding end as the right end of the crank pin 145 is press-fitted into the right web 147.

The crank pin 145 has a polishing center hole 148 on the axis of the crank pin 145.
The center hole 148 is formed in the crank pin 14
It is open to the right end of 5. In addition, the center hole 14
8, the connecting rod 57 and the crank pin 1
The branch hole 150 extends toward the fitting support portion 149 with the 45. An annular groove 152 centered on the axis of the crankshaft 34 is formed on each of the right end surfaces of the crank pin 145 and the right web 147, and a first annular guide 153 made of sheet metal is fitted into the annular groove 152. There is. The outer peripheral portion of the first annular guide 153 is folded back inward in the radial direction, thereby forming an inner peripheral groove 154. Also,
A communication hole 155 that opens from the inner circumferential groove 154 to the right end of the center hole 148 is formed.

On the other hand, the oil passage 156 is formed in the crankcase body 68 so that the lubricating oil 144 is directed to the right side area of the right bearing 143.
Are formed. The lubricating oil 144 pushed into the oil passage 156 passes through the right bearing 143 and is pushed out to the left side region of the right bearing 143, whereby the right bearing 143 is lubricated. Further, a second annular guide 158 made of sheet metal is provided on the left side surface of the right bearing 143.
Is attached, and the second annular guide 158 allows the lubricating oil 144 to pass through the inner circumferential groove 1 of the first annular guide 153.
I will guide you to 54.

When the crankshaft 34 rotates, the lubricating oil 144 accumulates in the inner peripheral groove 154 over the entire circumference due to the centrifugal force generated therein, and the communication hole 155 is formed.
The lubricating oil 144 passes through the center hole 148 and the branch hole 150 to lubricate the fitting support portion 149. According to the above configuration, the middle bearing 142 and the right bearing 143, which are used under severe conditions, can be effectively lubricated equally. Further, each center hole 148 is effectively used for the above lubrication. Further, although the annular groove 152 is discontinuous in the circumferential direction, the use of the first annular guide 153 allows the above lubrication to be performed without any trouble.

[0045]

According to the present invention, the generator in the motorcycle is usually provided on the outer side of the vehicle body, and focusing on the existence of an extra space below the generator, the fuel injection pump is provided in the space. It was arranged. Therefore, the space below the generator is effectively used, and accordingly, the generator and the fuel injection pump are compactly arranged. Further, in the above configuration, a drive gear that is always interlocked with the crankshaft is provided at the bottom of the generator case that forms the outer shell of the generator, and this drive gear removes the lubricating oil that accumulates at the bottom of the generator case. Since the oil is scattered, the lubricating oil is constantly scattered by the drive gear during operation of the engine, and the generator is always cooled by the scattered lubricating oil. In this case, since the drive gear for driving the other machine is used for cooling the generator, and the increase in the number of parts is suppressed, the cooling of the generator is achieved by a simple configuration. .. Further, since the drive gear is for driving the fuel injection pump, and the drive gear is rotated at a high speed because of the function of the fuel injection pump, the scattering of the lubricating oil is effectively performed. Therefore, the generator is effectively cooled.

[Brief description of drawings]

FIG. 1 is a plan sectional view of an engine.

FIG. 2 is an overall side view of the motorcycle.

FIG. 3 is a partially enlarged partial sectional view of FIG.

FIG. 4 is a plan sectional view of a power transmission device.

5 is a partially enlarged sectional view of FIG.

6 is a view taken along line 6-6 of FIG.

[Explanation of symbols]

 1 Motorcycle 18 Engine 34 Crankshaft 80 Flywheel Magnet (Generator) 80a Space 84 Generator Case 108 Fuel Injection Pump 114 6th Gear (Drive Gear)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Ito 2500 Shinkai, Iwata, Shizuoka Prefecture Yamaha Motor Co., Ltd.

Claims (3)

[Claims] 1. A motorcycle in which a generator for generating power in synchronization with a crankshaft of an engine is provided on an outer side portion of a vehicle body, while a fuel injection pump for supplying pressurized fuel to the engine is provided. Arrangement structure of a generator and a fuel injection pump in a motorcycle in which the fuel injection pump is arranged in a lower space. 2. A drive gear, which is always interlocked with a crankshaft, is arranged on the bottom side inside a generator case forming an outer shell of the generator, and the lubricating oil is scattered by the drive gear. Arrangement structure of a generator and a fuel injection pump in the motorcycle described. 3. The arrangement structure of the generator and the fuel injection pump in the motorcycle according to claim 2, wherein the drive gear is for driving the fuel injection pump.