ENGINE COOLING SYSTEM FOR MOTORCYCLE
An engine cooling system for a motorcycle of the present invention includes an engine that includes a crankcase and a cylinder, a water pump to supply cooling water to the engine, and a radiator that dissipates heat of internally circulating cooling water by receiving a travelling wind. The water pump is an electrically operated type including a driving motor, and disposed independently of the crankcase.
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This application is a continuation application of International Application No. PCT/JP2015/059687, filed on Mar. 27, 2015 and designated the U.S., which claims the benefit of priority of the prior Japanese Patent Application No. 2014-100664, filed on May 14, 2014, the entire contents of which are incorporated herein by reference.
TECHNICAL FIELDThe present invention relates to an engine cooling system to cool an engine in a vehicle such as a motorcycle.
BACKGROUND ARTIn a conventional motorcycle, a water-cooled engine uses a rotary driving shaft, a chain, and similar part for driving a lubricating oil pump to drive a water pump with a power of a crankshaft as a driving source.
Here, in examining the necessity of the water pump in this type of vehicle, two main conditions that requires water cooling of the engine are as follows.
1) Mounting a high output engine
2) Severe using state such as a sudden stop after a continuous high load operation
Thus the necessity for the water cooling of the engine is limited, that is, in a cold start, heat generation by the engine is used for warming-up the engine itself to reduce an extra heat capacity. In accordance with a case where an excessive cooling is not required such as an early warming-up or a steady operation, it is required to control an amount of cooling water to optimize the cooling. In using an oil pump drive system, under the condition where the amount of the cooling water increases in proportion to engine speed, a thermostat has a limitation in on/off control, and there is a difficulty with precise control for improvement of fuel efficiency.
CITATION LIST Patent LiteraturePatent Literature 1: Japanese Laid-open Patent Publication No. 4-203417
SUMMARY OF INVENTION Technical ProblemIn the water-cooled engine of the motorcycle, above-described structural reasons determine a layout inside the engine. This is a factor that inhibits simplification of the structure, downsizing, or similar improvement in the water-cooled engine compared with the case of an air-cooled or an oil-cooled engine. An overcooling of a combustion chamber causes to decrease thermal efficiency of the engine if the overcooling is left as it is. Further, while the basic structure is identical to the air-cooled or the oil-cooled engine, in the case of the water-cooled, restrictions on the placement of the water pump cause the necessity to fabricate especially around a crankcase by models. That is, it is actually difficult to make components in common with the air-cooled engine or similar engine. This makes the development method inefficient.
In a cooling system disclosed in Patent Literature 1, a bypass water passage is coupled to a circulating water channel to bypass a main water pump, and to the bypass water passage, an electric sub water pump that operates at least in a predetermined high temperature state of the engine is interposed. In this case, the sub water pump is used merely secondarily.
The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide an engine cooling system for a motorcycle that performs proper and precise cooling water control and effectively ensures downsizing and similar improvement.
Solution to ProblemAn engine cooling system for a motorcycle of the present invention includes an engine that includes a crankcase and a cylinder, a water pump to supply cooling water to the engine, and a radiator that dissipates heat of internally circulating cooling water by receiving a travelling wind. The water pump is an electrically operated type including a driving motor, and disposed independently of the crankcase.
In the engine cooling system for the motorcycle of the present invention, the water pump is disposed such that a pump shaft of the water pump is separated from a pump shaft of an oil pump in a side view of the vehicle body, and in a vehicle body width direction, the water pump is disposed such that at least apart of the water pump is lying inside outer ends of the crankcase, the cylinder, or the radiator.
In the engine cooling system for the motorcycle of the present invention, the water pump is disposed ahead of the crankcase or the cylinder and rear of a rear end portion of a front wheel, and disposed downward of the radiator, in the side view of the vehicle body.
In the engine cooling system for the motorcycle of the present invention, the crankcase includes a balancer shaft holder ahead of a shaft of an internal crankshaft, at least a part of the water pump overlaps with respect to the balancer shaft holder in the vertical direction, and the water pump is disposed ahead of the crankcase and downward of the balancer shaft holder in the side view of the vehicle body.
In the engine cooling system for the motorcycle of the present invention, the crankcase includes a balancer shaft holder ahead of a shaft of an internal crankshaft, at least a part of the water pump overlaps with respect to the balancer shaft holder in the vertical direction, and the water pump is disposed ahead of the cylinder and upward of the balancer shaft holder in the side view of the vehicle body.
In the engine cooling system for the motorcycle of the present invention, the water pump is disposed such that the longer side direction of the water pump is disposed to extend approximately parallel to an axis line of a balancer shaft in a front view of the vehicle body.
In the engine cooling system for the motorcycle of the present invention, the cylinder includes a cylinder block and a cylinder head, internally includes a coolant passage space that covers a peripheral area of a combustion chamber, and includes a cooling water inlet and a cooling water outlet to communicate with outside of the cylinder from the coolant passage space, and both the cooling water inlet and the cooling water outlet of the cylinder are disposed on an identical one side in the vehicle body width direction.
In the engine cooling system for the motorcycle of the present invention, the coolant passage space communicates with the outside of the cylinder block by the cooling water inlet and the cooling water outlet only.
In the engine cooling system for the motorcycle of the present invention, the water pump includes a cooling water discharge port and a cooling water suction port on one side and another side in the vehicle body width direction respectively in the front view of the vehicle body, and the radiator includes a cooling water intake and a cooling water supply port on one side and another side in the vehicle body width direction respectively.
In the engine cooling system for the motorcycle of the present invention, the cylinder includes a cam chain chamber on the other side in the vehicle body width direction.
In the engine cooling system for the motorcycle of the present invention, the engine includes an oil cooler in the crankcase, the oil cooler includes a cooling water inlet, a cooling water outlet, and a coolant passage to perform heat exchange with engine lubricating oil. The oil cooler is disposed in the crankcase, and includes the cooling water outlet and the coolant passage on the other side in the vehicle body width direction. The cooling water inlet side of the oil cooler is coupled to the radiator, and the cooling water outlet side is coupled to the water pump.
Advantageous Effects of InventionAccording to the present invention, the water pump is an electrically operated type driven by an electric motor. The drive system of the engine cooling system is separated from an oil pump drive system, and the drive system itself is independently driven. The drive control to the water pump by an ECU ensures the more precise flow rate control of the cooling water, and this ensures the engine to be easily maintained in the optimal cooling state. Then, the cooling water is caused to be circulated at the appropriate flow rate constantly without excess or deficiency to improve the engine output, fuel consumption performance, and similar performance.
The water pump is disposed independently separated from the crankcase to make the crankcase lying the lower portion of the vehicle body compact. This ensures the large inclination angle of the vehicle to improve the operability of the vehicle. Separating the water pump from the crankcase enhances the degree of freedom of the arrangement of the water pump to optimize the cooling path.
The following describes preferred embodiments of an engine cooling system for a motorcycle according to the present invention based on the drawings.
In
The vehicle body frame 101 integrally couples to the rear portion of the steering head pipe 102 branching into two forks rearward with a pair of right and left, and is disposed to extend from the steering head pipe 102 widening backward and downward. In this example, the vehicle body frame 101 may be what is called a diamond frame or a trellis frame, or an equivalent to them made by joining steel pipes. The vehicle body frame 101 is configured such that the engine as an integrated component of the vehicle body frame 101, which will be described later, functions as a reinforcing member of the vehicle body frame 101. From near the rear portion of the vehicle body frame 101, a seat rail 105 extends backward appropriately inclining to rise backward, and supports a seat (sitting seat).
Near the rear end lower of the vehicle body frame 101, a swing arm 107 couples swingably in the vertical direction via a pivot shaft 106. The swing arm 107 rotatably supports a rear wheel 108 on the rear end. Between the vehicle body frame 101 and the swing arm 107, a rear shock absorber is mounted. The lower end side of the rear shock absorber is coupled to both the vehicle body frame 101 and the swing arm 107 via a link mechanism. To the rear wheel 108, a driven sprocket to which a chain to transmit the power of the engine is wound around fits. The rear wheel 108 is rotatably driven via the driven sprocket. Upward the rear wheel 108, a rear fender to cover the rear wheel 108 is mounted.
Next, a description will be given of the configuration of the engine unit 10 with reference to
The crankcase 13 includes a crank chamber that rotatably journales the crankshaft 12 and a crank web to integratedly rotate with the crankshaft 12. Between the crank webs a connecting rod is coupled via a crank pin. On the distal end (small end portion) of the connecting rod, a piston is swingably mounted via a piston pin, and reciprocates inside the cylinder block 14 in the vertical direction. This rotatably drives the crankshaft 12.
The crankcase 13 integrally includes a transmission case 18 in the rear portion (see
The transmission case 18 integrally includes a drive shaft 21 on the rear obliquely downward of the countershaft 19, and on the countershaft 19 and the drive shaft 21, a plurality of transmission gears are disposed in a row. These transmission gears are selectively configured meshing relationship by a gear shift device. This ensures to obtain a gear ratio desired by the gear shifter. The power of the engine 11 is finally transmitted to a drive sprocket mounted on the shaft end of the drive shaft 21 from the crankshaft 12 through the transmission. The drive sprocket rotatably drives a driven sprocket, accordingly, the rear wheel 108 via a power transmission chain.
On the other hand, the crankcase 13 includes a balancer shaft 22 ahead of the crankshaft 12 in the front portion. On the balancer shaft 22, a balancer 23 is integrally attached. Disposing the balancer 23 reduces or inhibits vibration generated from the crankshaft 12. The crankcase 13 integrally includes a balancer shaft housing 24 projecting forward that internally houses and supports the balancer shaft 22 and the balancer 23. The balancer shaft 22 is coupled to the crankshaft 12 via a gear, and is rotatably driven by the crankshaft 12 as a power source.
In a valve system of the engine 11, the cylinder head 15 includes a cam shaft 25 to control the drive of an intake cam and an exhaust cam (
The engine 11 further includes an air intake system that supplies air-fuel mixture constituted of air (intake air) and fuel supplied from an air cleaner and a fuel supply device respectively, an exhaust system that discharges exhaust gas after burning inside the cylinder from the engine 11, a cooling system that cools the engine 11 and a lubrication system that lubricates movable parts of the engine 11, and a control system (Engine Control Unit; ECU) that controls operations of these systems. The control by the control system causes a plurality of function systems to collaborate with the above-described auxiliary machines or similar machine. This ensures the entire engine unit 10 to be performed smooth operations.
More specifically, first, in the air intake system, both the #1 and #2 cylinders open an air intake opening 27 (intake port; the schematic position is illustrated by a dotted line in
On the other hand, each throttle body 28 includes an injector 30 for fuel injection on the downstream side of the throttle valve, and a fuel pump supplies fuel in a fuel tank with respect to these injectors 30. Each injector 30 injects the fuel to the intake passage in the throttle body 28 at a predetermined timing by the above-described control of the control system. This ensures the cylinders of the #1 and #2 cylinders to be supplied with the air-fuel mixture of a predetermined air-fuel ratio.
Next, in the exhaust system, both the #1 and #2 cylinders open an exhaust outlet 31 (exhaust port; the schematic position is simply indicated by a dotted line in
Further, the lubrication system that supplies movable parts of the engine unit 10 with lubricating oil to lubricate those parts is configured. The lubrication system includes the crankshaft 12, the valve gear configured in the cylinder head 15, the cam chain to couple those parts, the transmission, and similar parts. This embodiment employs an ordinary oil pump with respect to the lubrication system, and the oil pump supplies the lubrication system with the lubricating oil sucked up from the oil pan 17.
As illustrated in
In the cooling system, on the peripheral area of the cylinder including the cylinder block 14, a water jacket formed to cause cooling water to circulate is configured. As illustrated in
The engine cooling system of the present invention is applied to the above-described cooling system, and especially, characterized by the water pump 38 of an electrically operated type including the driving motor for the water pump 38 and disposed independently of the crankcase 13. The driving motor of the water pump 38 can be controlled driving by the ECU with an on-vehicle battery of the motorcycle 100 as a driving power supply.
As illustrated in
As illustrated in
Here, a description will be given of a specific exemplary configuration of the water pump 38. With reference to
As illustrated in
As described above, the crankcase 13 includes the balancer shaft housing 24 as a balancer shaft holder ahead of the shaft of the internal crankshaft 12. Then, as illustrated in
In this case, at least apart of the water pump 38 overlaps with respect to the balancer shaft housing 24 in the vertical direction, and the water pump 38 is disposed ahead of the cylinder and downward of the balancer shaft housing 24 in the side view of the vehicle body.
As illustrated in
Here, the cylinder internally includes a coolant passage space (not illustrated) that covers the peripheral area of a combustion chamber as a part of the cooling system. As illustrated in
As illustrated in
In the above-described case, in the present invention, especially, the cylinder block 14 of the cylinder includes the inlet 47 and the outlet 48 for the cooling water communicating with the outside, and the internal coolant passage space communicates with the outside of the cylinder block 14 by the inlet 47 and the outlet 48 only.
As illustrated in
Further, as described above, the cylinder includes the cam chain chamber 26 concerning to the valve system, and as simply indicated by the one dot chain line in
In the above-described case, appropriate positions around the cooling system of the engine 11, for example, the radiator 37, the water jacket, or the engine 11 itself detect the temperature of such as the lubricating oil by a temperature sensor, and then, the detection signal is delivered to the ECU. The ECU is configured such that, based on the result of the temperature detection or measurements, the engine speed, or similar factor, the ECU appropriately controls the drive of the electric motor 45 of the water pump 38, causes the cooling water in the cooling system to circulate, and further, adjusts the flow rate of the cooling water.
In the engine unit 10 including the above-described engine cooling system, starting the engine 11 gradually raises the temperature of the engine 11. Now, as already described, the condition that requires the cooling of the engine 11 is limited mainly such as a case of a high output engine and a sudden stop after a continuous high load operation, and the optimization of the cooling is required by controlling the amount of the cooling water corresponding to the timing of the cold start and the early warming-up. When the oil pump drive system is used as in conventional methods, the proper and precise cooling control is not necessarily ensured.
In the engine cooling system of the present invention, the water pump 38 is an electrically operated type driven by the electric motor 45, the drive system of the engine cooling system is separated from the oil pump drive system, and the drive system itself is independently driven. Accordingly, the drive control to the water pump 38 by the ECU ensures the more precise flow rate control of the cooling water, and this ensures the engine 11 to be easily maintained in the optimal cooling state. Then, the cooling water is caused to be circulated at the appropriate flow rate constantly without excess or deficiency to improve the engine output and the fuel consumption performance.
Conventionally, the water pump is disposed side by side with the oil pump in the lower portion of the crankcase to use the oil pump drive system. In contrast to this, in the present invention, the water pump is disposed independently separated from the crankcase 13 to make the crankcase 13 lying on the lower portion of the vehicle body compact. This ensures the large inclination angle (bank angle) of the vehicle to improve the operability of the vehicle. Separating from the crankcase 13 enhances the degree of freedom of the arrangement of the water pump 38 to optimize the cooling path.
The pump shaft 40 of the water pump 38 is disposed separated from the pump shaft 36 of the oil pump 35 such that at least a part of the pump shaft 40 is lying inside the outer end of the crankcase 13, the cylinder, or the radiator 37.
Thus disposing the water pump 38 independently of the crankcase 13 and separated from the oil pump 35 ensures the crankcase 13 to be compact especially in the vehicle body width direction, and this ensures the large inclination angle of the vehicle to improve the operability. Disposing the water pump 38 such that a part of the water pump 38 is lying inside the outer end of the crankcase 13, the cylinder, or the radiator 37 in the vehicle body width direction ensures the similar effect.
The water pump 38 is disposed ahead of the crankcase 13 or the cylinder, and rear of the rear end portion of the front wheel 104.
Thus disposing the water pump 38 ahead of the crankcase 13 causes the water pump 38 to be lying immediately below the radiator 37. This ensures the cooling water pipe, which is conventionally disposed to extend obliquely forward from the side of the crankcase toward the radiator, to be shorten by the length of the front-rear direction of the vehicle body to improve the maintainability, the productivity or similar efficiency.
A part of the water pump 38 overlaps with respect to the balancer shaft housing 24 in the vertical direction, and the water pump 38 is disposed ahead of the crankcase 13 and downward of the balancer shaft housing 24 in the side view of the vehicle body. Thus disposing the water pump 38 so as to slide under the balancer shaft housing 24 disposed projecting ahead of the crankcase 13 ensures places, which are conventionally spaces (empty space, that is substantive dead space), to be used effectively, while the water pump 38 is caused to close with respect to the radiator 37 in the front-rear direction. This obtains a significant advantage on the layout.
The water pump 38 is disposed such that the longer side direction of the water pump 38 (the pump shaft 40) is disposed to extend approximately parallel to the shaft axis 46 of the balancer shaft 22.
Thus aligning the axis line of the balancer shaft 22 and the longer side direction of the water pump 38 ensures the water pump 38 to be disposed along the main body portion of the crankcase 13 and the balancer shaft housing 24. This ensures a plurality of these components to be efficiently disposed close one another to downsize and concentrate the mass. Then, the improvement of the operability of the vehicle is realized.
Both the inlet 47 and the outlet 48 for the cooling water to communicate with the outside the cylinder from the coolant passage space that covers the peripheral area of the combustion chamber in the cylinder are disposed on the identical one side in the vehicle body width direction.
Thus biasing the inlet 47 and the outlet 48 for the cooling water to the one side in the cylinder ensures the cooling water pipe extending from the water pump 38 to the radiator 37 through the cylinder, that is the cooling water hose 39A and the cooling water hose 39B, to be aggregated on one side of the one side. This improves the maintainability and makes the appearance beautiful.
In this case, the cylinder block 14 includes the inlet 47 and the outlet 48 for the cooling water, and the coolant passage space in the cylinder communicates with the outside of the cylinder block 14 by the inlet 47 and the outlet 48 only.
Thus making the flowing in/out of the cooling water to the engine 11 the cylinder block 14 only reduces the coolant passage communicating with the crankcase 13 and the cylinder head 15. This eliminates a care to the cooling water leakage at the joint, and improves the assembling performance and the maintainability. Further, this ensures the easier fabrication of the crankcase 13 and the cylinder head 15, and improves the productivity because the inspection of the cooling water leakage can be omitted.
In this respect, further, in common except the cylinder block 14, the compatibility with a cylinder block of a conventional air-cooled engine can be included, the air-cooled engine can be easily water cooled corresponding to the request of the engine performance. In the cylinder of the engine 11, the inlet 47 and the outlet 48 for the cooling water are close one another in the vertical direction of the vehicle body, further the radiator 37 is disposed on the approximately identical height. Then, the coolant passage can be aggregated in the vertical direction, and the cooling water pipe can be shorten to improve the maintainability. Further, the cooling water pipe can be not redundant in the vertical direction, and this ensures the beautiful appearance to be maintained even if a vehicle exposing the cooling water pipe.
The water pump 38 includes the discharge port 44 and the suction port 43 for the cooling water on the one side and the other side in the vehicle body width direction respectively, and the cylinder includes both the inlet 47 and the outlet 48 for the cooling water on the one side in the vehicle body width direction. In addition, the radiator 37 includes the intake 49 and the water supply port 50 for the cooling water on the one side and the other side in the vehicle body width direction respectively.
As illustrated in
The cam chain chamber 26 is disposed lying on the left side as the other side in the vehicle body width direction.
Thus disposing both the inlet 47 and the outlet 48 for the cooling water of the cylinder block 14 or the cylinder head 15 on the opposite side to the cam chain chamber 26 makes the coolant passage from the water pump 38 to the radiator 37 through the cylinder and the oil passage from the cylinder head 15 to (return) the crankcase 13 through the cylinder block 14 oppositely disposed in the vehicle body width direction. This ensures the shape structure inside the cylinder block 14 to be configured simply, and as a result, the cylinder block 14 is ensured to be compact.
Next, a description will be given of a second embodiment of the engine cooling system for the motorcycle according to the present invention.
The oil cooler 51 includes an inlet 52 and an outlet 53 for the cooling water, and the oil cooler 51 internally includes a coolant passage to cause the cooling water flowing in/out from the inlet 52 and the outlet 53 to circulate. In this example, the inlet 52, the outlet 53 and the coolant passage are disposed on the left side as the other side in the vehicle body width direction, and the inlet 52 is coupled to the water supply port 50 of the radiator 37 via a cooling water hose 39D. The outlet 53 is coupled to the suction port 43 of the water pump 38 via a cooling water hose 39E.
The cooling water cooled by the radiator 37 flows in the oil cooler 51 via the cooling water hose 39D, and cools the lubricating oil in the oil pan 17 during a process to circulate the coolant passage in the oil cooler 51. The lubricating oil cooled by the heat exchange with the oil cooler 51 is recirculated by the oil pump 35, at that time, an oil filter 54 removes impurities in the lubricating oil. The cooling water circulated the coolant passage in the oil cooler 51 is sucked in the water pump 38 via the cooling water hose 39E. The oil pump 35 and the oil filter 54 are disposed approximately side by side in the vehicle body width direction, the oil pump 35 is disposed on the one side in the vehicle body width direction, and the oil filter 54 is disposed on the other side, respectively.
The cooling system with respect to the lubricating oil is also disposed oppositely to the coolant passage from the water pump 38 to the radiator 37 through the cylinder in the vehicle body width direction. This ensures the shape structure inside the cylinder block 14 to be constituted simply. Detecting the temperature of such as the lubricating oil to appropriately control the drive of the water pump 38 based on the detection result, that is, cooling the lubricating oil in a high temperature as necessary realizes the efficient lubricating oil cooling.
Next, a description will be given of a third embodiment of the engine cooling system for the motorcycle according to the present invention.
According to the third embodiment of the present invention, as illustrated in
In the above-described third embodiment of the present invention, the water pump 38 is preferred to be disposed ahead of the cylinder and rear of the radiator 37 in the side view of the vehicle body, and at least a part of the water pump 38 overlaps the radiator 37 in the front view of the vehicle body. Thus disposing the radiator 37, the water pump 38, and the cylinder on the approximately identical height ensures the coolant passage to be configured in the approximately front-rear direction. This shortens the cooling water pipe by the length of the vertical direction to improve the maintainability and the productivity.
In the first to the third embodiments of the present invention, the entire water pump 38 is preferred to be disposed lying inside the outer end of the crankcase 13, the cylinder, or the radiator 37 in the vehicle body width direction.
While the water pump 38 is preferred to be disposed such that the longer side direction extends approximately parallel to the axis line of the crankshaft 12 or the axis line of the balancer shaft 22, the water pump 38 may slightly incline.
While the present invention has been described using various embodiments above, the present invention is not limited only to these embodiments. Changes and similar modification are possible within the scope of the present invention.
In the embodiments, while an example where the constituting members, the components or similar part of the engine cooling system are disposed on the one side or the other side in the vehicle body width direction is described, those parts may be arranged in the relation where right and left are reversed to the above-described embodiment.
INDUSTRIAL APPLICABILITYIn the present invention, the water pump is an electrically operated type driven by an electric motor, the drive control to the water pump ensures the more precise flow rate control of the cooling water, and this ensures the engine to be easily maintained in the optimal cooling state. Then, the cooling water is caused to be circulated at the appropriate flow rate constantly without excess or deficiency to improve the engine output, fuel consumption performance and similar performance.
Claims
1. An engine cooling system for a motorcycle, comprising:
- an engine that includes a crankcase and a cylinder;
- a water pump to supply cooling water to the engine; and
- a radiator that dissipates heat of internally circulating cooling water by receiving a travelling wind, wherein
- the water pump is an electrically operated type having a driving motor, and disposed independently of the crankcase.
2. The engine cooling system for the motorcycle according to claim 1, wherein
- the water pump is disposed such that a pump shaft of the water pump is separated from a pump shaft of an oil pump in a side view of the vehicle body, and
- in a vehicle body width direction, the water pump is disposed such that at least apart of the water pump is lying inside outer ends of the crankcase, the cylinder, or the radiator.
3. The engine cooling system for the motorcycle according to claim 1, wherein
- the water pump is disposed ahead of the crankcase or the cylinder and rear of a rear end portion of a front wheel, and disposed downward of the radiator in the side view of the vehicle body.
4. The engine cooling system for the motorcycle according to claim 1, wherein
- the crankcase includes a balancer shaft holder ahead of a shaft of an internal crankshaft, and
- at least a part of the water pump overlaps with respect to the balancer shaft holder in the vertical direction, and the water pump is disposed ahead of the crankcase and downward of the balancer shaft holder in the side view of the vehicle body.
5. The engine cooling system for the motorcycle according to claim 1, wherein
- the crankcase includes a balancer shaft holder ahead of a shaft of an internal crankshaft, and
- at least a part of the water pump overlaps with respect to the balancer shaft holder in the vertical direction, and the water pump is disposed ahead of the cylinder and upward of the balancer shaft holder in the side view of the vehicle body.
6. The engine cooling system for the motorcycle according to claim 4, wherein
- the water pump is disposed such that a longer side direction of the water pump is disposed to extend approximately parallel to an axis line of a balancer shaft in the front view of the vehicle body.
7. The engine cooling system for the motorcycle according to claim 1, wherein
- the cylinder includes a cylinder block and a cylinder head, internally includes a coolant passage space that covers a peripheral area of a combustion chamber, and includes a cooling water inlet and a cooling water outlet to communicate with outside of the cylinder from the coolant passage space, and
- both the cooling water inlet and the cooling water outlet of the cylinder are disposed on an identical one side in the vehicle body width direction.
8. The engine cooling system for the motorcycle according to claim 7, wherein
- the coolant passage space communicates with the outside of the cylinder block by the cooling water inlet and the cooling water outlet only.
9. The engine cooling system for the motorcycle according to claim 1, wherein
- the water pump includes a cooling water discharge port and a cooling water suction port on one side and another side in the vehicle body width direction respectively in the front view of the vehicle body, and
- the radiator includes a cooling water intake and a cooling water supply port on one side and another side in the vehicle body width direction respectively.
10. The engine cooling system for the motorcycle according to claim 1, wherein
- the cylinder includes a cam chain chamber on the other side in the vehicle body width direction.
11. The engine cooling system for the motorcycle according to claim 1, wherein
- the engine includes an oil cooler in the crankcase, the oil cooler includes a cooling water inlet, a cooling water outlet, and a coolant passage to perform heat exchange with engine lubricating oil,
- the oil cooler is disposed in the crankcase, and includes the cooling water outlet and the coolant passage on the other side in the vehicle body width direction, and
- the cooling water inlet side of the oil cooler is coupled to the radiator, and the cooling water outlet side is coupled to the water pump.
Type: Application
Filed: Feb 29, 2016
Publication Date: Jun 23, 2016
Applicant: SUZUKI MOTOR CORPORATION (Hamamatsu-shi)
Inventor: Koichi TANAKA (Hamamatsu-shi)
Application Number: 15/055,986