JP6502610B2 - Motorcycle engine - Google Patents

Description

  The present invention relates to an engine of a motorcycle in which an engine starting device and a water pump are disposed behind a cylinder of the engine.

  Some motorcycles are equipped with a water-cooled parallel multi-cylinder engine (see Patent Documents 1 to 3).

  In the parallel four-cylinder engine of the motorcycle described in Patent Document 1, a water pump for circulating coolant is disposed on the cylinder outer surface (in the width direction of the vehicle) near the cylinder and through a sprocket-chain mechanism dedicated to driving the water pump. The water pump is driven. Further, an oil pump for engine lubrication is disposed in the lower part in the crankcase of the engine, and the oil pump is driven along with the rotation of the crankshaft through a sprocket-chain mechanism dedicated for driving the pump.

  Further, a clutch mechanism and a transmission are disposed on the rear side in the crankcase of the engine, and an engine starting device including a starter motor and a starting gear train is disposed on the upper portion of the transmission. By operating the starter motor, the engine can be started by the engine starter.

  On the other hand, many engines of motorcycles are provided coaxially with a water pump for cooling water circulation and an oil pump for engine lubrication on the left side in the vehicle body width direction in the crankcase of the engine as described in Patent Document 2 .

  In the engine of this motorcycle, an engine starting device provided with a starter motor and a starting gear train is disposed on the left front side of the crankshaft in the vehicle body, and a starting pulley shaft (counter An oil pump and a water pump are disposed on the left side shaft end side of the shaft).

  Further, in the engine for a motorcycle according to Patent Document 3, an engine starting device including a starter motor and a starting gear train is provided between the cylinder and the generator on the upper surface of the crankcase, and the engine starting system from the starter motor is a generator drive system. Shared with some of the

JP, 2005-36776, A JP, 2008-163899, A Unexamined-Japanese-Patent No. 4-246276

  In the engine of the motorcycle described in Patent Document 1, the water pump is disposed on the outer surface of the crankcase in the vehicle body width direction near the crankshaft, and the water pump is driven from the crankshaft through a sprocket-chain mechanism dedicated to driving the water pump. Ru. It is difficult to secure a sufficient bank angle of the vehicle, and the water pump and the oil pump are driven through the dedicated sprocket-chain mechanism, respectively, which complicates the pump drive configuration of the water pump and the oil pump. The increase in size leads to an increase in weight and cost.

  Further, in the motorcycle engine described in Patent Document 2, the oil pump and the water pump are coaxially disposed on the rear side of the crankcase of the engine with the oil pump and the water pump coaxially disposed. Because the sprockets, drive chains, gear shift levers, side stands, etc. are closely arranged, it is difficult to secure the space for the water pump.

  For this reason, in the motorcycle engine, the water pump provided at the shaft end is disposed at a position moved from the center of the vehicle in the width direction of the vehicle. There is a problem that the weight increase is caused by the extension of the hose length.

  Furthermore, in the engine for a motorcycle described in Patent Document 3, an engine starting device provided with a starter motor is provided between the cylinder and the generator on the upper surface of the crankcase of the engine to achieve compactness of the engine. Although part of the generator drive system is shared by the engine start system, there is no suggestion or wearing of a technique for always driving the water pump using the engine start system.

  The present invention has been made in consideration of the above-described circumstances, and a starter motor and a water pump are disposed behind the engine cylinder and above the crankcase to make the engine compact and lightweight, and make the bank angle of the vehicle An object of the present invention is to provide an engine of a motorcycle capable of securing a sufficient

  Another object of the present invention is to use an engine starting system from a starter motor as a driving system for a water pump, eliminate the need for a separate pump driving system for the water pump, simplify the configuration, and make the engine compact and lightweight. An object of the present invention is to provide an engine of a motorcycle that can be designed.

An engine of a motorcycle according to the present invention is a motorcycle engine provided with a cylinder of the engine at an upper front portion of a crankcase in order to solve the above-mentioned problems. and a water pump for circulating cooling water between the starter motor to start place, by connecting a portion of the engine starting system from the starter motor to the pump drive shaft of the water pump by driving the water pump, the engine The starting system is connected to the counter shaft from the starter motor via the starting gear train, and is connected to the engine crankshaft from the counter shaft via the primary gear, and the water pump is a transmission gear on the counter shaft And outward in the vehicle width direction than the starter motor, In which characterized in that said starter motor and a portion is provided to overlap.
Further, in order to solve the above-mentioned problems, an engine of a motorcycle according to the present invention has a cylinder of the engine provided on an upper front side of a crankcase, wherein place a water pump for circulating the starter motor and the cooling water to start the engine, by providing a one-way clutch of the engine starting system coaxially with the pump drive shaft of the water pump by driving the water pump, the engine starting system Is connected to the counter shaft from the starter motor via the starting gear train, and is connected to the engine crankshaft from the counter shaft via the primary gear, and the water pump comprises a transmission gear on the counter shaft and Outside in the vehicle width direction than the starter motor In which characterized in that said starter motor and a portion is provided to overlap.
Furthermore, in order to solve the problems described above, an engine of a motorcycle according to the present invention has a cylinder of the engine provided on the front upper portion of the crankcase, wherein the engine is provided on the upper portion of the crankcase behind the cylinder. place a water pump for circulating the starter motor and the cooling water to start the engine, the starter idle gear shaft of the engine starting system, provided coaxially with the pump drive shaft of the water pump by driving the water pump, the The engine starting system is connected to the counter shaft from the starter motor via the starting gear train, and is connected to the engine crankshaft from the counter shaft via the primary gear, and the water pump is a transmission on the counter shaft Outside in the vehicle width direction than the gear and the starter motor , Is characterized in that provided partially overlap with the starter motor in a side view.

  In the engine of the motorcycle according to the present invention, since the starter motor and the water pump are disposed at the rear of the engine cylinder and at the top of the crankcase, the water pump is not positioned outward of the crankcase. Since the bank angle of the vehicle can be sufficiently secured, the water pump can be always driven by utilizing the engine starting system from the starter motor, and an independent pump drive system of the water pump is not required. Simplification can be achieved, and the engine can be made more compact and lighter.

FIG. 1 is a left side view of a motorcycle equipped with an engine of a motorcycle according to the present invention. FIG. 2 is a side sectional view of an engine mounted on the motorcycle of FIG. 1; Sectional drawing in alignment with the III-III line of FIG. The figure which shows the drive system of the water pump using the engine starting system of the starter motor.

  Hereinafter, an embodiment according to the present invention will be described with reference to the attached drawings.

  FIG. 1 is a left side view showing the entire appearance of a motorcycle. In FIG. 1, the front side of the vehicle is indicated by a symbol “F”, and the rear side of the vehicle is indicated by a symbol “R”.

  In the motorcycle 10, a water-cooled parallel multi-cylinder engine 12 is mounted on a vehicle body 11 of a frame structure, and driving wheels are driven by the parallel multi-cylinder engine 12. The motorcycle 10 has a vehicle body 11, a front wheel 13 which is a steered wheel, a steering handle 14 which steers the front wheel 13, and a rear wheel 15 which is a drive wheel. The vehicle body 11 has a pair of left and right main frames 18 extending rearward and downward from a head pipe 17. A central frame portion 18a at the rear of the main frame 18 extends vertically downward, and a pivot 19 is provided midway. The rear wheel 15 is supported by the rear end of the swing arm 20 which is swingably supported around the pivot 19.

  Further, as shown in FIG. 2, in the parallel multi-cylinder engine 12, for example, a four-cylinder engine, a cylinder assembly 23 is provided forward of the upper part of the crankcase 22 and inclined forward of the vehicle at a required angle. In the cylinder assembly 23, the cylinder 24, the cylinder head 25 and the head cover 26 are sequentially assembled and integrally configured. The crankcase 22 is configured such that the upper case 22a and the lower case 22b can be divided up and down. In FIG. 1, reference numeral 27 denotes a fuel tank, and reference numeral 28 denotes a vehicle seat.

  As shown in FIGS. 2 and 3, a starter motor 30 and a water pump 31 for circulating cooling water are installed in the vehicle width direction on the rear side of the cylinder 24 of the engine 12 and on the upper case 22a of the crankcase 22. An engine starting device 34 is configured as an engine starting system from the starter motor 30 and the starting gear train. The motor shaft 33 of the starter motor 30 protrudes on the vehicle center line CL side, and is connected and connected to a rotation-free primary driven gear 36 provided on the counter shaft 35 via an engine starting system 34. The engine starting system 34 is disposed obliquely above the vehicle front side of the counter shaft 35.

  Specifically, motor shaft 33 of starter motor 30 is connected to starter clutch shaft 39 via multiple stages, for example, two stages of reduction gear 37 and one-way clutch 38, and start drive gear 40 of starter clutch shaft 39 is primary driven. The gear 36 is engaged with a start driven gear 41 provided on the inner side in the vehicle width direction of the gear 36 (the vehicle center line CL side). The first reduction gear 37a is a mesh between the motor spline shaft of the motor shaft 33 and the starter idle driven gear, and the second reduction gear 37b is a drive gear of the starter idle shaft 43 and a one-way on the starter clutch shaft 39 It is the meshing between the clutch 38 and an integral driven gear. The reduction gear 37 is covered by a gear cover case 42 integral with the upper case 22 a of the crankcase 22. The water pump 31 is coaxial with the one-way clutch 38 and is disposed behind the cylinder 24 on the left side of the engine 12.

  Further, as shown in FIG. 3, in the parallel multi-cylinder engine 12, a primary drive gear 46 is formed on one crank web 45 of the engine crank 44, and the primary drive gear 46 meshes with the primary driven gear 36. It constitutes the primary gear of the engine drive system. When the push rod 47 is operated and the multi disc clutch mechanism 48 is turned ON, the engine driving force from the primary drive gear 46 is transmitted to the counter shaft 35 through the primary driven gear 36 and the multi disc clutch mechanism 48. The transmission gear 49 on the counter shaft 35 and the transmission gear (not shown) of the drive shaft 50 are selected by the transmission 53 composed of the shift cam 51 and the shift fork 52 shown in FIG.

  On the drive shaft 50, a drive sprocket 54 on the left side of the vehicle is transmitted to a driven sprocket 56 on the rear wheel axle via a drive chain 55 as shown in FIG. 1, and the rear wheel 15 is driven.

  On the other hand, when the engine is started, as shown in FIG. 3, when the starter motor 30 of the engine starting device 34 is started, the motor driving force starts the driving gear 40 via the reduction gear 37 of the engine starting system 34 and the one way clutch 38. The engine driven gear 41 is transmitted to the crank shaft 44 through the primary gears 36 and 46 and is driven to rotate the engine crank 44, whereby the engine 12 is started.

  When the engine 12 is started, the driving force of the engine 12 is transmitted from the crankshaft 44 to the counter shaft 35 through the primary drive gear 46, the primary driven gear 36 and the multi-plate clutch mechanism 48, and then transmission from the counter shaft 35. It is transmitted to the drive shaft 50 through the transmission 53 of the gear 49 and transmitted to the rear wheel 15 through the drive chain 55 to drive the rear wheel 15.

  Furthermore, as shown in FIGS. 3 and 4, the drive shaft 58 of the water pump 31 is rotatably integrated on a starter clutch shaft 39 that constitutes an intermediate shaft of the engine starting system 34 from the starter motor 30. The water pump 31 is provided outside the starter motor 30 in the vehicle width direction on the upper case 22 a of the crankcase 22. As shown in FIG. 2, the water pump 31 is provided on the vehicle rear side of the cylinder 24 of the cylinder assembly 23 and above the upper case 22 a of the crankcase 22.

  In the water pump 31, as shown in FIG. 2, the cooling water hose 61 from the radiator 60 is connected to the pump suction port 62 side, and the pump discharge port 63 side passes through the cooling water hose 64 and the water jacket of the cylinder assembly 23 Connected to 66. Cooling water discharged by the pump drive of the water pump 31 is discharged to the water jacket 66 of the cylinder assembly 23, and after cooling the inside of the cylinder 24 and the cylinder head 25, the temperature is raised and sent to the radiator 60 to cool the engine 12 On the other hand, after the engine 12 is cooled, the radiator 60 is to be cooled. The cooling water hoses 61 and 64 are disposed on the left side of the cylinder 24 and connect the water pump 31 to the cylinder 24 and the radiator 60.

  On the other hand, the lower case 22b of the crankcase 22 is provided with an oil pan 69 storing lubricating oil 68. An oil strainer 70 extends into the lubricating oil 68 stored in the oil pan 69, and the stored lubricating oil 68 is supplied from the oil strainer 70 to an oil gallery (not shown) by the oil pump 71 to lubricate the engine 12 It is supplied to the department. The oil pump 71 is connected to the drive shaft 50 via a sprocket and chain mechanism 73, and is driven by the rotational drive of the drive shaft 50 so as to be pump-driven.

  In the parallel four-cylinder engine 12 according to this embodiment, the water pump 31 is an engine crank 44 so that the water pump 31 is disposed behind (rear) the cylinder 24 of the cylinder assembly 23 and on the upper case 22 a of the crankcase 22. Unlike the one provided on the lower side outside the nearby crankcase, a sufficient bank angle of the vehicle can be secured.

  Further, since the water pump 31 is rotationally driven using the constant rotation shaft of the engine starting system 34 (the starter clutch shaft 39 of the intermediate shaft), an independent sprocket / chain mechanism for driving the water pump 31 is unnecessary. On the other hand, the piping length of the cooling water hoses 61 and 64 from the water pump 31 to the radiator 60 can also be shortened. Therefore, the weight of the engine 12 can be reduced and the flow path resistance can be reduced, and the amount of cooling water can be reduced.

  Furthermore, since the water pump 31 can be always driven independently of the oil pump 71 independently and the water pump 31 and the oil pump 71 can be individually set to an optimal reduction ratio and driven, lubrication can be achieved. Efficiency and cooling efficiency can be improved. In addition, since the water pump 31 is installed on the upper case 22a of the crankcase 22, there is no need to install the water pump on the outer surface of the crankcase on the lower left side of the engine as in a conventional motorcycle. The degree of freedom in the layout of the gear shift parts can be increased, and the shift feeling can be improved.

  In the description of the embodiment of the present invention, an example in which the pump drive shaft of the water pump and the one-way clutch 38 (intermediate shaft 39) of the engine starting system are provided coaxially has been described. What is necessary is to use a part of the starting system. The center shaft of any one of the engine starting systems may be coaxial with the pump drive shaft of the water pump, or may be coaxial with, for example, the starter idle gear shaft other than the starter clutch shaft. In this case, the one-way clutch may be provided on the starter idle gear shaft of the intermediate shaft.

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 11 ... Vehicle main body, 12 ... Engine, 13 ... Front wheel, 14 ... Steering handle, 15 ... Rear wheel, 17 ... Head pipe, 18 ... Main frame, 19 ... Pivot, 20 ... Swing arm, 22 ... Crankcase, 23: cylinder assembly, 24: cylinder, 25: cylinder head, 26: head cover, 27: fuel tank, 28: vehicle seat, 30: starter motor, 31: water pump, 33: motor shaft (motor spline shaft) , 34: engine start system, 35: counter shaft, 36: primary driven gear, 37: reduction gear, 38: one-way clutch, 39: starter clutch shaft (intermediate shaft), 40: start drive gear, 41: start driven gear, 43 ... Starter idle shaft (intermediate shaft), 45 ... crank web, 46 ... Lively drive gear, 47: Push rod, 48: Multi-plate clutch mechanism, 49: Transmission gear, 50: Drive shaft, 51: Shift cam, 52: Shift fork, 53: Transmission, 54: Drive sprocket, 55: Drive chain, 56: Driven sprocket, 58: Drive shaft, 60: Radiator, 61, 64: Cooling water hose, 62: Pump inlet, 63: Pump outlet, 66: Water jacket, 68: Lubricant, 69: Oil pan, 70 ... oil strainer, 71 ... oil pump, 73 ... sprocket and chain mechanism.

Claims (3)

In a motorcycle engine in which the cylinder of the engine is provided on the upper front side of the crankcase,
A starter motor for starting the engine and a water pump for circulating cooling water are disposed at the top of the crankcase at the rear of the cylinder.
Connect a part of the engine start-up system from the starter motor to the pump drive shaft of the water pump by driving the water pump,
The engine starting system is connected to the counter shaft from the starter motor via a starting gear train, and is connected to the engine crankshaft from the counter shaft via a primary gear.
The water pump is provided outward of the transmission gear on the counter shaft and the starter motor in the vehicle width direction, and is partially overlapped with the starter motor in a side view. Engine. In a motorcycle engine in which the cylinder of the engine is provided on the upper front side of the crankcase,
A starter motor for starting the engine and a water pump for circulating cooling water are disposed at the top of the crankcase at the rear of the cylinder.
Provided one-way clutch of the engine starting system coaxially with the pump drive shaft of the water pump by driving the water pump,
The engine starting system is connected to the counter shaft from the starter motor via a starting gear train, and is connected to the engine crankshaft from the counter shaft via a primary gear.
The water pump is provided outward of the transmission gear on the counter shaft and the starter motor in the vehicle width direction, and is partially overlapped with the starter motor in a side view. Engine. In a motorcycle engine in which the cylinder of the engine is provided on the upper front side of the crankcase,
A starter motor for starting the engine and a water pump for circulating cooling water are disposed at the top of the crankcase at the rear of the cylinder.
The starter idle gear shaft of the engine starting system, provided coaxially with the pump drive shaft of the water pump by driving the water pump,
The engine starting system is connected to the counter shaft from the starter motor via a starting gear train, and is connected to the engine crankshaft from the counter shaft via a primary gear.
The water pump is provided outward of the transmission gear on the counter shaft and the starter motor in the vehicle width direction, and is partially overlapped with the starter motor in a side view. Engine.

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