JP6900806B2 - Engine cooling system - Google Patents

Description

The present invention relates to an engine cooling system that cools the engine of a saddle-mounted vehicle with cooling water.

Water-cooled engine cooling systems with water jackets, water pumps and radiator devices are used in many saddle-mounted vehicles. Some radiator devices in such an engine cooling system have a configuration in which two radiators are arranged above and below.

Patent Document 1 below describes a radiator structure in which two radiators are arranged above and below. As shown in FIG. 2 of Patent Document 1, the tank on the left side of the upper first radiator is divided into upper and lower parts by a partition plate. Further, the lower portion of the tank on the left side of the first radiator is connected to the tank on the left side of the second radiator via a pipe. The cooling water that has passed through the water jacket of the engine flows into the upper part of the tank on the left side of the first radiator, passes through the upper part of the core of the first radiator, enters the tank on the right side of the first radiator, and further. It returns from the lower part of the core of the first radiator and flows into the lower part of the tank on the left side of the first radiator. Subsequently, the cooling water enters the tank on the left side of the second radiator through a pipe from the lower part of the tank on the left side of the first radiator, passes through the core of the second radiator, and the tank on the right side of the second radiator. Inflow to. Subsequently, the cooling water flows out from the tank on the right side of the second radiator and is sent to the cooling water pump.

Japanese Unexamined Patent Publication No. 2000-97579

In the radiator structure described in Patent Document 1, a path connecting two radiators in series is formed as a path for cooling water flowing through the structure. That is, the cooling water flowing out from the water jacket of the engine first circulates through the first radiator, then circulates through the second radiator, and is sent to the cooling water pump.

When two radiators are connected in series, the cooling water will sequentially circulate the cores of the two radiators. Therefore, the section in which the cooling water flows through the core becomes long in the cooling water path. Since the tube constituting the radiator core has a small cross-sectional area, if the section in which the cooling water flows through the core becomes long in the cooling water path, the pressure loss of the cooling water flow increases and the cooling efficiency of the cooling water deteriorates. .. Therefore, it is considered difficult to improve the cooling efficiency of the cooling water with the radiator structure described in Patent Document 1.

Further, in the radiator structure described in Patent Document 1, as can be seen from FIG. 2 of Patent Document 1, the cooling water that has passed through the water jacket flows in from the left side of the first radiator, and the first radiator and the first radiator. After the two radiators are sequentially distributed, they flow out from the right side of the second radiator and are sent to the cooling water pump. As described above, in this radiator structure, the inflow position and the outflow position of the cooling water are opposite to each other, and both positions are separated from each other. Therefore, the cooling water piping may be dispersed, and the cooling system in the saddle-type vehicle may become large. As the cooling system becomes larger, the cooling water piping becomes easier to contact with other parts, and the degree of freedom in layout of other parts is reduced. Further, as the cooling system becomes larger, the cooling water piping is easily exposed to the outside, and the design of the appearance of the saddle-mounted vehicle deteriorates.

The present invention has been made in view of, for example, the above-mentioned problems, and an object of the present invention is to provide an engine cooling system capable of improving the cooling efficiency of cooling water and reducing the size of the system. To do.

In order to solve the above problems, the engine cooling system of the present invention is an engine cooling system that cools the engine of a saddle-type vehicle, and is a water pump that discharges cooling water and a cooling water discharged from the water pump. A water jacket that cools the engine, a radiator device that cools the cooling water after cooling the engine, a radiator inflow path that guides cooling water from the water jacket to the radiator device, and a water pump from the radiator device. The radiator device has an upper radiator and a lower radiator, the upper radiator is located in front of the engine, and the flow direction of the cooling water in the core is the saddle. The lower radiator is arranged in the left-right direction of the type vehicle, the lower radiator is located in front of the engine and below the upper radiator, and the flow direction of the cooling water in the core is the left-right direction of the saddle-type vehicle. The radiator inflow path is arranged so as to allow the cooling water from the water jacket to flow into the respective cores from one end in the left-right direction of the respective cores of the upper radiator and the lower radiator. The radiator outflow path guides the inflow of the cooling water that has flowed out from the left and right other ends of the cores of the upper radiator and the lower radiator, and after the cooling water merges with each other, the core of the upper radiator. It is characterized in that the radiator and the core of the lower radiator are guided so as to be directed to one side in the left-right direction.

According to the present invention, the cooling efficiency of the cooling water can be improved and the system can be miniaturized.

It is explanatory drawing which looked at the engine unit provided with the engine cooling system of the Example of this invention from the right front. It is explanatory drawing which looked at the engine unit in FIG. 1 from the right side. It is explanatory drawing which looked at the part where the radiator device was arranged in the engine unit in FIG. 1 from the front. It is explanatory drawing which shows the state which removed the radiator device from the engine unit in FIG. It is explanatory drawing which looked at the engine cooling system and the like of the Example of this invention from the right rear. It is explanatory drawing which looked at the engine cooling system and the like of the Example of this invention from the left rear. It is a circuit diagram of the engine cooling system of the Example of this invention.

The engine cooling system of the embodiment of the present invention is an engine cooling system for cooling the engine of a saddle-type vehicle, and includes a water pump, a water jacket, a radiator device, a radiator inflow path, and a radiator outflow path.

A water pump is a device that discharges cooling water. The water jacket has a function of cooling the engine with the cooling water discharged from the water pump.

The radiator device is a device that cools the cooling water after cooling the engine, and has an upper radiator and a lower radiator. The upper radiator is located in front of the engine and is arranged so that the cooling water flow direction in the core is the left-right direction of the saddle-type vehicle. The lower radiator is located in front of the engine and below the upper radiator, and is arranged so that the cooling water flow direction in the core is the left-right direction of the saddle-type vehicle.

The radiator inflow path is a path that guides cooling water from the water jacket to the radiator device. The radiator inflow path guides the cooling water from the water jacket so that the cooling water is diverted and flows into the respective cores from one end in the left-right direction of each core of the upper radiator and the lower radiator.

The radiator outflow route is a route that guides cooling water from the radiator device to the water pump. The radiator outflow path is such that the cooling water that has flowed out from the other end in the left-right direction of each core of the upper radiator and the lower radiator is left and right between the core of the upper radiator and the core of the lower radiator after the cooling waters merge with each other. Guide to one side in one direction.

In the engine cooling system of the embodiment of the present invention, the cooling water flowing out from the water jacket is guided to the radiator inflow path and flows into the respective cores from one end in the left-right direction of each core of the upper radiator and the lower radiator. .. Subsequently, the cooling water that has flowed into the core of the upper radiator circulates in the core in the left-right direction from one end to the other, and then flows out from the other end of the core. At the same time, the cooling water that has flowed into the core of the lower radiator also circulates in the core from one end to the other in the left-right direction, and then flows out from the other end of the core. Subsequently, the cooling water flowing out from the other end of the upper radiator and the lower radiator core in the left-right direction merges with each other in the radiator outflow path, and then moves in the left-right direction between the core of the upper radiator and the core of the lower radiator. It circulates to one side and is guided to the water pump.

As can be grasped from such a flow of cooling water, in the engine cooling system of the embodiment of the present invention, a path connecting two radiators in parallel is formed as a path of cooling water circulating in this system. Has been done. That is, the cooling water splits and flows in parallel with the core of the upper radiator and the core of the lower radiator, and then merges with each other. Since the two radiators are connected in parallel, the section through which the cooling water flows through the radiator core can be shortened in the cooling water path compared to the case where the two radiators are connected in series. it can. Therefore, the pressure loss of the flow of the cooling water can be reduced, and the cooling efficiency of the cooling water can be improved. Further, since the two radiators are connected in parallel, the cooling water cooled by the first radiator is not cooled again by the second radiator. From this point as well, the cooling efficiency of the cooling water can be improved.

Further, in the engine cooling system of the embodiment of the present invention, the cooling water flowing out from the water jacket is guided to the radiator inflow path and enters the respective cores from one end in the left-right direction of each core of the upper radiator and the lower radiator. Inflow. On the other hand, the cooling water flowing through the cores of the upper radiator and the lower radiator flows out from the other end in the left-right direction of each core. However, the cooling water flowing out from the other end in the left-right direction of each of the cores is merged with each other by the radiator outflow path, and is guided to one side in the left-right direction between the core of the upper radiator and the core of the lower radiator. Be taken. As described above, in the engine cooling system of the embodiment of the present invention, the position where the cooling water flows into the radiator device is arranged on one side in the left-right direction of the saddle-type vehicle, and the cooling water flowing out from the radiator device is raised. It guides the saddle-type vehicle to one side in the left-right direction through the radiator outflow route arranged between the radiator core and the lower radiator core. As a result, the parts constituting the engine cooling system can be centrally arranged on one side in the left-right direction of the saddle-type vehicle, and a small engine cooling system can be easily realized. Furthermore, since the parts that make up the engine cooling system can be centrally placed, other parts can be placed around the engine of the saddle-type vehicle without contacting the parts that make up the engine cooling system. It becomes possible to easily form a possible space. Therefore, the degree of freedom in the layout of other parts can be increased. In addition, since the parts that make up the engine cooling system can be compactly integrated, it is easy to hide the parts that make up the engine cooling system from the outside, and the design of the appearance of the saddle-type vehicle can be improved. it can.

Further, in the engine cooling system of the embodiment of the present invention, the radiator outflow path extends in the left-right direction between the upper radiator and the core and the core of the lower radiator. That is, since both the upper radiator core and the lower radiator core are arranged so that the cooling water flow direction in those cores is in the left-right direction, both the upper radiator core and the lower radiator core are in front of the engine. It spreads in the left-right direction. The radiator outflow route extends in the left-right direction between the core of the upper radiator and the core of the lower radiator, which extends in the left-right direction, along the core of the upper radiator and the core of the lower radiator. In other words, the radiator outflow route is arranged so as to fit in a long gap in the left-right direction between the core of the upper radiator and the core of the lower radiator. As described above, according to the engine cooling system of the embodiment of the present invention, the dead space between the core of the upper radiator and the core of the lower radiator is effectively utilized to make the radiator outflow path compact so as not to come into contact with other parts. Can be formed into.

FIG. 1 is a view of the engine unit 11 provided with the engine cooling system 30 according to the embodiment of the present invention as viewed from the front right, and FIG. 2 is a view of the engine unit 11 as viewed from the right. Further, FIG. 3 is a front view of a portion of the engine unit 11 in which the radiator device 37 is arranged. FIG. 4 shows a state in which the radiator device 37 is removed from the engine unit 11 in FIG. Further, FIG. 5 is a view of the engine cooling system 30 and the like viewed from the rear right, and FIG. 6 is a view of the engine cooling system 30 and the like viewed from the rear left. Further, FIG. 7 is a circuit diagram of the engine cooling system 30. In addition, in order to make it easy to identify the engine cooling system 30 in the engine unit 11 provided with a large number of parts, in FIGS. 1 to 6, the engine unit 11 has two parts other than the engine cooling system 30. It is shown by a chain line. The alternate long and short dash line in FIGS. 3 and 4 indicates the center of the saddle-mounted vehicle in the left-right direction. Further, in the following description of the embodiment, the front, rear, left, right, up and down directions are based on the driver who drives the saddle-type vehicle provided with the engine unit 11.

In FIG. 1, the engine unit 11 is provided in a saddle-type vehicle such as a motorcycle. The engine unit 11 supplies the engine 12, a part of the drive system that transmits the power of the engine 12 to the drive wheels, a lubrication system that lubricates the moving parts of the engine 12, and a mixture of air and fuel to the engine 12. It includes an intake system (including a supercharger 113), a part of an exhaust system that exhausts exhaust gas generated by combustion of an air-fuel mixture from the engine 12, an engine cooling system 30 that cools the engine 12 and the like, and the like.

The engine 12 is a water-cooled parallel 2-cylinder 4-cycle gasoline engine in this embodiment. The engine 12 is provided with a crankcase 13 for accommodating a crankshaft, a cylinder 14 is provided above the crankcase 13, a cylinder head 15 is provided above the cylinder 14, and above the cylinder head 15. A cylinder head cover 16 is provided. An oil pan 17 is provided below the crankcase 13.

A part of the drive system such as the primary reduction mechanism, the clutch, and the transmission is housed in the transmission case 21 arranged at the rear of the engine unit 11. Further, among the oil pump, the oil filter 25, and the oil cooler 26 constituting the lubrication system, the oil pump is provided in the engine unit 11. Further, the oil filter 25 and the oil cooler 26 are provided on the lower front side of the crankcase 13 as shown in FIG.

Further, as shown in FIGS. 1, 2 and 4, the intake system includes an air cleaner 111, a supercharger 113, an intercooler 117, an exhaust duct 118, a surge tank 119 and the like. The air cleaner 111 is a device that filters air taken in from the outside, and is arranged on the upper left side of the engine 12 as shown in FIG. As shown in FIG. 4, the supercharger 113 includes a turbine unit 114, a compressor unit 115, and a bearing unit 116. The turbine unit 114 is driven by the exhaust gas from the engine 12, and the compressor unit 115 is driven by this power. It is a device that is driven and compresses the air supplied through the air cleaner 111 by the compressor unit 115. The supercharger 113 is arranged in front of the engine 12, specifically in front of the cylinder 14 and the cylinder head 15. In FIG. 2, the intercooler 117 is a device that cools the air that has become hot due to the compression of the compressor portion 115 of the supercharger 113. The exhaust air duct 118 is a duct that exhausts the cooling air applied to the intercooler 117 to the outside. The intercooler 117 and the exhaust duct 118 are arranged on the upper right side of the engine 12. The surge tank 119 is a device that rectifies the flow of air cooled by the intercooler 117, and is arranged above and behind the engine 12. As components constituting the intake system, an electronically controlled throttle device that adjusts the amount of air supplied to the intake port of the engine 12 and fuel are injected into the intake port of the engine 12 above the rear of the cylinder head 15. Injectors and the like are provided, but these figures are omitted.

Further, as shown in FIGS. 1 and 4, the air cleaner 111 and the compressor portion 115 of the supercharger 113 are connected by an air intake pipe 125. Further, the compressor portion 115 of the supercharger 113 and the intercooler 117 are connected by an air outlet pipe 126. The air intake pipe 125 and the air outlet pipe 126 are arranged on the front left side of the engine 12, and extend vertically between the engine 12 and the radiator device 37 when the saddle-type vehicle is viewed from the left. Further, the intercooler 117 and the surge tank 119 are connected by a connecting pipe 127.

Further, as shown in FIG. 4, in the exhaust system, the exhaust pipe 131 is a pipe connecting the exhaust port of the engine 12 and the turbine portion 114 of the turbocharger 113, and is arranged in front of the engine 12. In this embodiment, the exhaust pipe 131 is integrally formed with the housing of the turbine portion 114 of the turbocharger 113. Further, one end side of the muffler joint pipe 132 is connected to the turbine portion 114 of the turbocharger 113, and the other end side of the muffler joint pipe 132 extends to the muffler.

Further, as shown in FIGS. 1 and 7, the engine cooling system 30 includes a water pump 31, a water jacket 35 (see FIG. 7), a radiator device 37, and a cooling water flow control unit 71.

The water pump 31 is a device that discharges cooling water to the water jacket 35. The water pump 31 is attached to the right portion of the crankcase 13 as shown in FIG. 2, and operates by utilizing the rotation of the crankshaft. As shown in FIG. 6, the water pump 31 includes a first pump discharge port 32 for discharging the cooling water toward the water jacket 35, and a pump inflow port 33 for flowing the cooling water into the water pump 31. .. Further, as shown in FIG. 5, the water pump 31 includes a second pump discharge port 34 that discharges cooling water toward the oil cooler 26 and the bearing portion 116 of the supercharger 113.

The water jacket 35 (see FIG. 7) is a mechanism for cooling the cylinder 14 and the cylinder head 15 with cooling water. The water jacket 35 is provided around the cylinder bore of the cylinder 14, or near the intake port and the exhaust port of the cylinder head 15. Further, as shown in FIG. 2, an outlet 36 is formed at the rear portion of the cylinder head 15 to allow the cooling water after flowing through the water jacket 35 to flow out to the radiator inlet pipe 83 side.

The radiator device 37 is a device that cools the cooling water by receiving running wind or driving the radiator fan 56 and releasing the heat of the cooling water to the atmosphere. As shown in FIG. 2, the radiator device 37 is arranged in front of the engine 12. Further, as shown in FIG. 3, the radiator device 37 includes an upper radiator 38 and a lower radiator 46. The upper radiator 38 and the lower radiator 46 are of a cross-flow type, respectively, and the cooling water is cooled by circulating the cooling water in the left-right direction (from right to left in this embodiment) in each of the radiators 38 and 46. Further, as shown in FIG. 6, the radiator fan 56 is attached to the rear surface of the upper radiator 38.

As shown in FIG. 3, the upper radiator 38 is provided in a core 39 having a large number of tubes and heat dissipation fins for heat exchange, an inflow tank 40 provided on the right side of the core 39, and a left side of the core 39. It is equipped with an outflow tank 41. As shown in FIG. 5, in the upper radiator 38, an upper radiator inflow port 42 for allowing cooling water to flow into the inflow tank 40 is formed in the upper part of the rear surface of the inflow tank 40. Further, on the rear surface of the inflow tank 40, a bypass outlet 43 for flowing out the cooling water flowing into the inflow tank 40 to the bypass pipe 85 is formed below the upper radiator inflow port 42. Further, on the lower surface of the inflow tank 40, a distribution outlet 44 for distributing the cooling water flowing into the inflow tank 40 to the lower radiator 46 is formed. On the other hand, as shown in FIG. 6, an upper radiator outlet 45 for draining the cooling water from the outflow tank 41 is formed on the lower surface of the outflow tank 41 of the upper radiator 38.

Further, the lower radiator 46 also includes a core 47, an inflow tank 48, and an outflow tank 49, similarly to the upper radiator 38. In the lower radiator 46, as shown in FIG. 5, a lower radiator inflow port 50 for allowing cooling water to flow into the inflow tank 48 is formed on the right surface of the inflow tank 48. Further, as shown in FIG. 6, a lower radiator outlet 51 for draining the cooling water from the outflow tank 49 is formed on the left surface of the outflow tank 49. Further, the width (length in the left-right direction) of the lower radiator 46 is smaller than the width of the upper radiator 38.

Further, as shown in FIG. 3, a connection path 52 for connecting the distribution outlet 44 of the upper radiator 38 and the lower radiator inlet 50 of the lower radiator 46 is formed. The connection path 52 includes connection pipes 53 and 54 and a connection hose 55. One end side of the connection pipe 53 is fixed to the distribution outlet 44 of the upper radiator 28, and the other end side extends downward. One end side of the connecting pipe 54 is fixed to the lower radiator inflow port 50 of the lower radiator 46, the other end side extends to the right, and then curves and extends upward. The connecting hose 55 extends in the vertical direction to connect the connecting pipe 53 and the connecting pipe 54.

Further, as will be described later, a radiator outlet pipe 92 is provided between the upper radiator 38 and the lower radiator 37 to guide the cooling water cooled by the radiator device 37 to the cooling water flow control unit 71 side. Further, on the left end side of the radiator outlet pipe 92, a merging portion 92A having connection ports at the upper part and the lower part is formed. A connection path 56 is formed between the upper radiator outlet 45 of the upper radiator 38 and the confluence portion 92A to connect the two. The connection path 56 includes a connection pipe 57 and a connection hose 58. One end side of the connection pipe 57 is fixed to the upper radiator outlet 45, and the other end side extends downward. The connection hose 58 extends in the vertical direction, one end side is connected to the connection pipe 57, and the other end side is connected to the upper connection port of the merging portion 92A. Further, a connection path 59 is formed between the lower radiator outlet 51 of the lower radiator 46 and the confluence portion 92A to connect the two. The connection path 59 includes a connection pipe 60 and a connection hose 61. One end of the connecting pipe 60 is fixed to the lower radiator outlet 51, and the other end of the connecting pipe 60 is curved to the left and then extends upward. The connection hose 61 extends in the vertical direction, one end side is connected to the connection pipe 60, and the other end side is connected to the lower connection port of the merging portion 92A.

Further, the radiator device 37 includes a radiator cap 62. As shown in FIG. 5, the radiator cap 62 is attached to a cooling water injection port formed on the upper surface of the inflow tank 40. This water inlet is at the highest position in the engine cooling system 30. The radiator cap 62 has a function of releasing the cooling water to the cooling water reservoir tank when the pressure in the cooling water path in the engine cooling system 30 is high, and returning the cooling water from the cooling water reservoir tank when the pressure in the cooling system is low. Have. Inside the radiator cap 62, a valve that opens and closes according to the pressure in the cooling water path is provided, and a cooling water reservoir tank is connected to the radiator cap 62 via a pipe. Although the cooling water reservoir tank is not shown, the cooling water reservoir tank is arranged, for example, between the lower radiator 46 and the crankcase 13.

In FIG. 2, the cooling water flow control unit 71 has a function of controlling the flow rate of the cooling water flowing through the radiator device 37 according to the temperature of the cooling water after cooling the engine 12 and keeping the temperature of the cooling water at an appropriate temperature. doing. The cooling water flow control unit 71 is provided at a position where the bypass path (bypass hose 85) and the radiator outflow path 91, which will be described later, meet, and is arranged behind the right portion of the upper radiator 38. Further, the cooling water flow control unit 71 is supported by a bypass hose 85 and a water pump inlet hose 94, which will be described later.

Further, as shown in FIG. 7, the cooling water flow control unit 71 includes a thermostat case 72 and a thermostat 77. The thermostat case 72 is formed in a box shape by, for example, a heat-resistant resin material or a metal material. Further, in the thermostat case 72, the first cooling water inflow port 73 for flowing the cooling water flowing through the radiator outlet pipe 92 and the connecting hose 93 into the thermostat case 72, and the cooling water flowing through the bypass hose 85 are thermostatted. A second cooling water inflow port 74 for flowing into the case 72 is formed. Further, the thermostat case 72 is formed with a third cooling water inflow port 75 for allowing the cooling water flowing through the supercharger outlet pipe 96 to flow into the thermostat case 72. Further, the thermostat case 72 is formed with a cooling water outlet 76 for allowing cooling water to flow out from the thermostat case 72 to the water pump inlet hose 94.

The thermostat 77 is housed in the thermostat case 72. The thermostat 77 includes a main valve 78 and a sub valve 79. The main valve 78 changes the flow rate of the cooling water flowing from the first cooling water inflow port 73 toward the cooling water outflow port 76. The auxiliary valve 79 changes the flow rate of the cooling water flowing from the second cooling water inflow port 74 toward the cooling water outflow port 76.

The arrangement of each component constituting the engine cooling system 30 is as follows. That is, as shown in FIG. 2, the water pump 31 is arranged on the right side surface of the crankcase 13 in front of the axis X1 of the crankshaft. For example, the water pump 31 is arranged so that the drive axis of the water pump 31 is coaxial with the axis X2 of the balance shaft located in front of the axis X1 of the crankshaft.

Further, as shown in FIG. 7, a path for guiding the cooling water discharged from the first pump discharge port 32 to the water jacket 35 between the first pump discharge port 32 of the water pump 31 and the water jacket 35. 101 is formed. This path 101 is formed inside the crankcase 13 and the like.

Further, as shown in FIG. 4, the cooling water flow control unit 71 is arranged on the right side of the center in the left-right direction of the saddle-mounted vehicle. Specifically, it is arranged in front of the right front corner of the cylinder head 15. Further, the cooling water flow control unit 71 is arranged at a position closer to the center in the left-right direction of the saddle-type vehicle than the water pump 31. Further, as can be seen by comparing FIGS. 3 and 4, the cooling water flow control unit 71 is centered in the left-right direction of the saddle-type vehicle with respect to the rightmost portion of the radiator device 37 (including the radiator cap 62). It is located near.

Further, as shown in FIG. 2, the cooling water flow control unit 71 is arranged at a position lower than the cylinder head cover 16. Specifically, the cooling water flow control unit 71 is arranged in front of the cylinder head 15. Further, the cooling water flow control unit 71 is arranged at a position higher than that of the water pump 31. Further, the cooling water flow control unit 71 is arranged between the engine 12 and the radiator device 37 when the saddle-mounted vehicle is viewed from the right side.

Further, the engine cooling system 30 includes a radiator inflow path 81. The radiator inflow path 81 is a path for guiding cooling water from the water jacket 35 to the radiator device 37. Specifically, the radiator inflow path 81 divides the cooling water from the water jacket 35 from the right ends of the cores 39 and 47 of the upper radiator 38 and the lower radiator 46, respectively. , 47 is guided to flow into. As shown in FIG. 5, the radiator inflow path 81 is composed of a connecting hose 82, a radiator inlet pipe 83, a connecting hose 84, an inflow tank 40 of the upper radiator 38, a connection path 52, an inflow tank 48 of the lower radiator 46, and the like. ing.

As can be seen by comparing FIGS. 2 and 5, one end of the connection hose 82 is connected to the outlet 36 of the water jacket 35 located near the center in the left-right direction at the rear of the cylinder head 15, and the other end is connected to the outlet 36. It extends to the right. The radiator inlet pipe 83 is, for example, a metal pipe, and as shown in FIG. 2, one end side thereof is connected to the connecting hose 82 at a position on the rear right side of the cylinder head 15, and the other end side is the right side of the cylinder head 15. It extends forward in sequence through the right side of the cylinder head cover 16 and the right side of the cylinder head cover 16, and is slightly inclined to the right to reach the vicinity of the upper radiator inflow port 42. The connection hose 84 connects the radiator inlet pipe 83 and the upper radiator inflow port 42.

Further, the engine cooling system 30 includes a radiator outflow path 91. The radiator outflow path 91 is a path for guiding cooling water from the radiator device 37 to the water pump 31 via the cooling water flow control unit 71. Specifically, in the radiator outflow path 92, the cooling water that has flowed out from the left ends of the cores 39 and 47 of the upper radiator 38 and the lower radiator 46, respectively, is merged with each other, and then the core 39 of the upper radiator 38. And the core 47 of the lower radiator 46 are guided to the right, and then this cooling water is guided to the cooling water flow control unit 71, and further guided from the cooling water flow control unit 71 to the water pump 31. As shown in FIGS. 3, 5 and 6, the radiator outflow path 91 includes an outflow tank 41 of the upper radiator 38, a connection path 56, an outflow tank 49 of the lower radiator 46, a connection path 59, and a lead-out path (radiator outlet pipe 92). ), The connecting hose 93, the thermostat case 72, the water pump inlet hose 94, and the like.

The derivation path merges the cooling water flowing out from the left ends of the cores 39 and 47 of the upper radiator 38 and the lower radiator 46 with each other, and makes a right side between the core 39 of the upper radiator 38 and the core 47 of the lower radiator 46. It is a route leading to. The lead-out path is formed by the radiator outlet pipe 92. As shown in FIG. 3, the radiator outlet pipe 92 extends in the left-right direction between the core 39 of the upper radiator 38 and the core 47 of the lower radiator 46. The radiator outlet pipe 92 extends horizontally and substantially linearly in a direction perpendicular to the straight-ahead direction of the saddle-mounted vehicle.

In the radiator outlet pipe 92, the left end portion thereof is located below the outflow tank 41 of the upper radiator 38, and the right end portion is close to the position below the inflow tank 40 of the upper radiator 38. However, the radiator outlet pipe 92 is within the width of the radiator device 37. That is, when the saddle-type vehicle is viewed from the front, the radiator outlet pipe 92 is located on the left-right center side of the saddle-type vehicle with respect to the leftmost portion of the radiator device 37, and is the radiator device. It is located on the left-right center side of the saddle-type vehicle rather than the portion located on the rightmost side of 37. Further, when the saddle-type vehicle is viewed from the side, as shown in FIGS. 1 and 2, the frontmost portion of the radiator outlet pipe 92 is the front surface of the lower radiator 46 and the front and rear of the saddle-type vehicle. It is located at the same position in the direction, or at a position behind the front surface of the lower radiator 46.

The radiator outlet pipe 92 is a metal pipe. Further, as shown in FIG. 3, the radiator outlet pipe 92 is fixed to both the upper radiator 38 and the lower radiator 46 by a pair of brackets 63 (fixing members) arranged apart from each other in the left-right direction.

Further, as described above, a merging portion 92A is formed on the left end side of the radiator outlet pipe 92. The merging portion 92A is formed by bifurcating the left end side of the radiator outlet pipe 92 into a T-shape having an upwardly facing connection port and a downwardly facing connection port. The lower end of the connection hose 58 constituting the connection path 56 is connected to the connection port facing upward of the merging portion 92A, and the connection path 59 is formed to the connection port facing downward of the merging portion 92A. The upper end of the connection hose 61 is connected.

As shown in FIG. 4, one end of the connection hose 93 is connected to the right end side of the radiator outlet pipe 92, and the other end is the first cooling water inflow port 73 formed in the thermostat case 72 of the cooling water flow control unit 71. It is connected to the. The connecting hose 93 is curved from the right end side of the radiator outlet pipe 92 and extends rearward, then further curved and extends upward, and the first cooling water inflow port 73 located behind the inflow tank 40 of the upper radiator 38. Has reached.

One end of the water inlet hose 94 is connected to the cooling water outlet 76 of the thermostat case 72, and the other end is connected to the pump inlet 33 of the water pump 31. As shown in FIG. 4, the water pump inlet hose 94 is arranged on the right side of the center of the saddle-mounted vehicle in the left-right direction, and as can be seen by comparing FIGS. 3 and 4, the radiator device 37 is the most. It is arranged on the left side of the portion located on the right side, and as shown in FIG. 2, it is arranged behind the radiator device 37 when the saddle-mounted vehicle is viewed from the right side.

Further, the engine cooling system 30 includes a bypass path. The bypass path is a path connecting the bypass outlet 43 of the upper radiator 38 and the second cooling water inlet 74 of the thermostat case 72. The bypass path guides the cooling water flowing through the radiator inflow path 81 to the radiator outflow path 91 without passing through either the core 39 of the upper radiator 38 or the core 47 of the lower radiator 46. Specifically, the bypass path is formed by a bypass hose 85. That is, as shown in FIG. 6, the bypass outlet 43 of the upper radiator 38 and the second cooling water inlet 74 of the cooling water flow control unit 71 (thermostat case 72) are connected by a bypass hose 85. As shown in FIG. 4, the bypass hose 85 is arranged on the right side of the center of the saddle-mounted vehicle in the left-right direction, and as can be seen by comparing FIGS. 3 and 4, it is on the far right side of the radiator device 37. It is arranged on the left side of the located portion, and as shown in FIG. 2, it is arranged between the engine 12 and the radiator device 37 when the saddle-mounted vehicle is viewed from the right.

Further, the engine cooling system 30 has a structure for cooling the bearing portion 116 of the supercharger 113 using cooling water. By cooling the bearing portion 116, it is possible to suppress a temperature rise of the lubricating oil of the bearing that rotatably supports the rotating shafts of the turbine wheel and the compressor impeller in the supercharger 113. Specifically, as shown in FIG. 5, cooling water is provided between the second pump discharge port 34 of the water pump 31 and the bearing portion 116 by a shared pipe 102, a flow dividing portion 100, and a supercharger inlet pipe 95. A route is formed. The flow dividing portion 100 is a component that divides the cooling water flowing through the common pipe 102 into the supercharger inlet pipe 95 and the oil cooler linelet pipe 97, and is, for example, a Y-shaped joint. Further, the bearing portion 116 and the third cooling water inflow port 75 of the cooling water flow control unit 71 are connected by a supercharger outlet pipe 96. Both the supercharger inlet pipe 95 and the supercharger outlet pipe 96 are arranged between the engine 12 and the radiator device 37.

Further, the engine cooling system 30 has a structure for cooling engine oil using cooling water. Specifically, as shown in FIG. 6, a cooling water path is provided between the second pump discharge port 34 of the water pump 31 and the oil cooler 26 by a shared pipe 102, a diversion portion 100, and an oil cooler linelet pipe 97. Is formed. Further, in the radiator inlet pipe 83, a connecting portion 99 is provided near the upper radiator inflow port 42, and the oil cooler 26 and the connecting portion 99 are connected by an oil cooler outlet pipe 98. The connection portion 99 is, for example, a connection port formed in a part of the peripheral wall of the radiator inlet pipe 83. The connecting portion 99 may be formed by using a T-shaped joint. The oil cooler outlet pipe 98 extends vertically from the center of the saddle-mounted vehicle in the left-right direction (specifically, the right side of the supercharger 113) between the engine 12 and the radiator device 37.

The operation of the engine cooling system 30 is as follows. First, when the temperature of the cooling water is equal to or lower than the predetermined reference temperature T1 (first state), the engine cooling system 30 operates as follows. That is, in FIG. 7, the thermostat 77 of the cooling water flow control unit 71 closes the main valve 78 and opens the sub valve 79 when the temperature of the cooling water in the thermostat case 72 is equal to or lower than the predetermined reference temperature T1. As a result, in the thermostat case 72, the path between the first cooling water inlet 73 and the cooling water outlet 76 is blocked, and the path between the second cooling water inlet 74 and the cooling water outlet 76 is connected. Will be done. For example, such a state occurs when the engine 12 is warmed up.

In this first state, the cooling water discharged from the first pump discharge port 32 of the water pump 31 circulates through the water jacket 35 to cool the engine 12, and then connects to the connection hose 82, the radiator inlet pipe 83, and the connection. The hoses 84 are sequentially circulated and flow into the inflow tank 40 from the upper radiator inflow port 42 of the upper radiator 38. In the inflow tank 40, the cooling water cannot flow to the core 39 and the lower radiator 46 of the upper radiator 38, but can flow from the bypass outlet 43 to the bypass pipe 85. The cooling water in the inflow tank 40 flows out from the bypass outlet 43, flows through the bypass pipe 85, and flows into the thermostat case 72 from the second cooling water inflow port 74 of the thermostat case 72. The cooling water that has flowed into the thermostat case 72 flows out from the cooling water outlet 76 of the thermostat case 72, flows through the water pump inlet hose 94, and returns to the water pump 31 through the pump inflow port 33.

Next, when the temperature of the cooling water is higher than the predetermined reference temperature T2 (T2> T1) (second state), the engine cooling system 30 operates as follows. That is, the thermostat 77 opens the main valve 78 and closes the sub valve 79 when the temperature of the cooling water in the thermostat case 72 exceeds the reference temperature T2. As a result, in the thermostat case 72, the path between the first cooling water inlet 73 and the cooling water outlet 76 is connected, and the path between the second cooling water inlet 74 and the cooling water outlet 76 is blocked. Will be done.

In this second state, the cooling water discharged from the water pump 31 first circulates through the water jacket 35, the radiator inlet pipe 85, and the like as in the first state, and the inflow tank 40 of the upper radiator 38. Inflow into. In the inflow tank 40, the cooling water cannot flow from the bypass outlet 43 to the bypass pipe 85, but can flow to the core 39 and the lower radiator 46 of the upper radiator 38. The cooling water that has flowed into the inflow tank 40 is divided into a path toward the core 39 of the upper radiator 38 and a path toward the lower radiator 46. The cooling water diverted to the path toward the core 39 of the upper radiator 38 flows through the core 39, is cooled by the core 39, flows into the outflow tank 41, and flows out from the upper radiator outflow port 45. On the other hand, the cooling water diverted to the path toward the lower radiator 46 sequentially circulates in the connection path 52, the inflow tank 48 of the lower radiator 46 and the core 47, is cooled by the core 47, and then is cooled by the core 47, and then the outflow tank 49 of the lower radiator 46. It flows in and flows out from the lower radiator outlet 51. The cooling water flowing out from the upper radiator outlet 45 and the lower radiator outlet 51 circulates through the connection paths 56 and 59, respectively, reaches the merging portion 92A of the radiator outlet pipe 92, and merges in the merging portion 92A. In this way, the cooling water circulates in parallel with the core 39 of the radiator 38 and the core 47 of the lower radiator 46. Subsequently, the cooling water merged in the merging portion 92A sequentially flows through the radiator outlet pipe 92 and the connecting hose 93, and flows into the thermostat case 72 through the first cooling water inflow port 73. After that, the flow of the cooling water returning from the inside of the thermostat case 72 to the water pump 31 is the same as in the first state.

Next, when the temperature of the cooling water is higher than the reference temperature T1 and is in a state of the reference temperature T2 or less (third state), the thermostat 77 opens both the main valve 78 and the sub valve 79. As a result, in the thermostat case 72, the path between the first cooling water inlet 73 and the cooling water outlet 76 is connected, and the path between the second cooling water inlet 74 and the cooling water outlet 76 is established. Be connected. In this third state, the cooling water that has flowed into the inflow tank 40 of the upper radiator 38 follows a path toward the core 39 of the upper radiator 38, a path toward the lower radiator 46, and a path that flows out from the bypass outlet 43. Divide. The separated cooling water flows through the respective paths and flows into the thermostat case 72 as in the first state or the second state, and then returns to the water pump 31.

Further, the thermostat 77 changes the opening degrees of the main valve 78 and the sub valve 79 according to the temperature of the cooling water which is higher than the reference temperature T1 and changes within the range of the reference temperature T2 or less. As a result, the ratio of the flow rate of the cooling water flowing through the core 39 of the upper radiator 38 and the core 47 of the lower radiator 46 to the flow rate of the cooling water flowing through the bypass pipe 85 changes according to the temperature of the cooling water.

On the other hand, in any of the first state, the second state and the third state, the engine cooling system 30 further operates as follows. That is, the cooling water discharged from the second pump discharge port 34 of the water pump 31 flows through the common pipe 102 to reach the diversion section 100, and the supercharger inlet pipe 95 and the oil cooler linelet pipe 97 in the diversion section 100. Divide into. The cooling water diverted to the supercharger inlet pipe 95 circulates in the bearing portion 116 of the supercharger 113 and cools the bearing portion 116. After that, the cooling water sequentially flows through the supercharger outlet pipe 96, the third cooling water inlet 75, the thermostat case 72, the cooling water outlet 76, and the water pump inlet pipe 94, and returns to the water pump 31. On the other hand, the cooling water diverted to the oil cooler linelet pipe 97 reaches the oil cooler 26 and cools the engine oil. After that, this cooling water circulates in the oil cooler outlet pipe 98, reaches the connection portion 99 of the radiator inlet pipe 83, and circulates in the radiator inlet pipe 83 from the water jacket 35 toward the inflow tank 40 of the upper radiator 38. Merge with water.

As described above, in the engine cooling system 30 of the embodiment of the present invention, the radiator device 37 has an upper radiator 38 and a lower radiator 46, and the cooling water circulates these two radiators in parallel. As a result, it is possible to shorten the section in which the cooling water flows through the core of the radiator in the path of the cooling water, as compared with the case where the cooling water directly flows through the two radiators. Therefore, the pressure loss of the flow of the cooling water can be reduced, and the cooling efficiency of the cooling water can be improved. Further, since the two radiators are connected in parallel, the cooling water cooled by the first radiator is not cooled again by the second radiator. From this point as well, the cooling efficiency of the cooling water can be improved.

Further, in the engine cooling system 30 of the embodiment of the present invention, the cooling water flowing out from the water jacket 35 enters the cores 39 and 47 from the right end of the cores 39 and 47 of the upper radiator 38 and the lower radiator 46, respectively. Inflow. On the other hand, the cooling water flowing through the cores 39 and 47 of the upper radiator 38 and the lower radiator 46 flows out from the left end of the cores 39 and 47, respectively. However, the cooling water flowing out from the left end of the cores 39 and 47 is directed to the right between the core 39 of the upper radiator 38 and the core 47 of the lower radiator 46 by the connection paths 56 and 59 and the radiator outlet pipe 92 and the like. Guided to. In this way, according to the engine cooling system 30, the cooling water flowing out of the radiator device 37 can be guided to the right side of the engine unit 11 in which the cooling water flows into the radiator device 37. Therefore, the parts constituting the engine cooling system 30 (that is, the radiator inlet pipe 83, the bypass hose 85, the water pump inlet pipe 92, the cooling water flow control unit 71, the water pump 31, etc.) are collectively arranged on the right side of the engine unit 11. The small engine cooling system 30 can be easily realized. Therefore, a space in which other parts can be arranged in the engine unit 11 can be easily formed on the left side of the engine unit 11, and the degree of freedom in layout of the other parts can be increased. Further, since the parts constituting the engine cooling system 30 can be compactly integrated, these parts can be easily hidden from the outside, and the design of the appearance of the saddle-type vehicle can be improved.

Further, the radiator outlet pipe 92 is arranged so as to fit in a long gap in the left-right direction between the core 39 of the upper radiator 38 and the core 47 of the lower radiator 46. As described above, according to the engine cooling system 30, the dead space between the core 39 of the upper radiator 38 and the core 47 of the lower radiator 46 is effectively utilized to make the radiator outflow path 91 compact so as not to come into contact with other parts. Can be formed into.

Further, in the engine cooling system 30 of the embodiment of the present invention, the radiator outflow path 91 is located on the left end side of the radiator outlet pipe 92 extending in the left-right direction between the core 39 of the upper radiator 38 and the core 47 of the lower radiator 46. The merging portion 92A) is connected to the lower end of the connection path 56 extending downward from the outflow tank 40 of the upper radiator 38 and the upper end of the connection path 59 extending upward from the outflow tank 49 of the lower radiator 46, respectively. Is formed by. As a result, a structure for merging the cooling water flowing out from the upper radiator 38 and the lower radiator 46 and a structure for guiding the merged cooling water to the right side of the radiator device 37 are compactly formed between the upper radiator 38 and the lower radiator 46. can do.

Further, in the engine cooling system 30, the radiator outlet pipe 92 is arranged so as to fit within the width of the radiator device 37. As a result, it is possible to prevent the radiator outlet pipe 92 from protruding laterally from the radiator device 37, and the width of the engine unit 11 can be reduced.

Further, in the engine cooling system 30, the frontmost portion of the radiator outlet pipe 92 is located at the same position as the front surface of the lower radiator 46 in the front-rear direction of the saddle-type vehicle when the saddle-type vehicle is viewed from the side. , Or, it is located behind the front surface of the lower radiator 46. As a result, it is possible to prevent the traveling wind toward the radiator device 37 from being obstructed by the radiator outlet pipe 92, and it is possible to improve the cooling efficiency of the cooling water by the radiator device 37.

Further, since the radiator outlet pipe 92 is a metal pipe, it has high heat dissipation. Therefore, when the running wind hits the radiator outlet pipe 92, the cooling water circulating in the radiator outlet pipe 92 can be effectively cooled.

Further, the radiator outlet pipe 92 is fixed to both the upper radiator 38 and the lower radiator 46 via the bracket 63. As a result, the upper radiator 38 and the lower radiator 46 can be firmly connected via the metal radiator outlet pipe 92. Further, by using the radiator outlet pipe 92 as a member for increasing the connecting strength between the upper radiator 38 and the lower radiator 46, a dedicated part for increasing the connecting strength between the upper radiator 38 and the lower radiator 46 becomes unnecessary, so that the number of parts is increased. Can be reduced.

Further, in the engine cooling system 30, the water pump 31 is attached to the right side portion of the crankcase 13 of the engine 12. As a result, the parts of the engine cooling system 30 can be integrated on the right side of the engine unit 11. Further, the piping constituting the radiator outflow path 91 such as the water inlet hose 94 can be shortened.

Further, since the cooling water flow control unit 71 is located on the right side of the saddle-mounted vehicle and is located between the engine 12 and the radiator device 37 when the saddle-mounted vehicle is viewed from the right side, the engine The components constituting the cooling system 30 can be integrated on the right side of the engine, and the radiator outflow path 91 and the bypass hose 85 can be shortened.

In the above-described embodiment, the parts of the engine cooling system 30, such as the water pump 31, the cooling water flow control unit 71, the radiator inlet pipe 83, the bypass hose 85, and the water pump inlet hose 94, are arranged on the right side of the saddle type vehicle. , The case where the intake system parts such as the air intake pipe 125 and the air outlet pipe 126 are arranged on the left side of the saddle type vehicle has been taken as an example, but these arrangements may be reversed left and right.

Further, in the above-described embodiment, one end side of the bypass pipe 85 is connected to the bypass outlet 43 of the inflow tank 40 of the upper radiator 38, but one end side of the bypass pipe 85 is connected to the upper radiator in the radiator inlet pipe 83. It may be directly connected to the portion near the inflow port 42.

Further, it is possible to appropriately select whether the pipe forming the radiator inflow path 81, the bypass path or the radiator outflow path 91 is formed by a hose, a pipe, or a combination of a hose and a pipe.

Further, as the thermostat in the cooling water flow control unit 71, a thermostat that does not have the auxiliary valve 79 can also be used.

The present invention can also be applied to a saddle-type vehicle not equipped with a supercharger. Moreover, the number of cylinders of the engine is not limited. Further, the present invention is not limited to motorcycles, but can be applied to other types of saddle-type vehicles such as motorcycles and buggies.

Further, the present invention can be appropriately modified within a range not contrary to the gist or idea of the invention that can be read from the claims and the entire specification, and the engine cooling system accompanied by such a modification is also the technical idea of the present invention. include.

30 Engine cooling system 31 Water pump 35 Water jacket 37 Radiator 38 Upper radiator 39 Core 46 Lower radiator 47 Core 52 Connection route 56 Connection route (first connection route)
59 connection route (second connection route)
63 Bracket (fixing member)
71 Cooling water flow control unit 81 Radiator inflow path 83 Radiator inlet pipe 85 Bypass hose (bypass path)
91 Radiator outflow route 92 Radiator outlet pipe (leading route)
94 Water pump inlet hose

Claims (7)

An engine cooling system that cools the engine of a saddle-type vehicle.
A water pump that discharges cooling water and
A water jacket that cools the engine with the cooling water discharged from the water pump, and
A radiator device that cools the cooling water after cooling the engine,
A radiator inflow path that guides cooling water from the water jacket to the radiator device,
It is provided with a radiator outflow path for guiding cooling water from the radiator device to the water pump.
The radiator device has an upper radiator and a lower radiator.
The upper radiator is located in front of the engine, and is arranged so that the flow direction of the cooling water in the core is the left-right direction of the saddle-type vehicle.
The lower radiator is located in front of the engine and below the upper radiator, and is arranged so that the flow direction of the cooling water in the core is the left-right direction of the saddle-type vehicle.
The radiator inflow path guides the cooling water from the water jacket to flow into the respective cores from one end in the left-right direction of the respective cores of the upper radiator and the lower radiator by dividing the cooling water.
In the radiator outflow path, the cooling water that has flowed out from the other ends of the cores of the upper radiator and the lower radiator in the left-right direction is merged with each other, and then the core of the upper radiator and the core of the lower radiator. An engine cooling system characterized by guiding the vehicle to one side in the left-right direction. The upper radiator is provided on the other side in the left-right direction of the core, and has an outflow tank from which the cooling water after flowing through the core flows out.
The lower radiator is provided on the other side in the left-right direction of the core, and has an outflow tank from which the cooling water after flowing through the core flows out.
The radiator outflow path includes a first connection path extending downward from the outflow tank of the upper radiator, a second connection path extending upward from the outflow tank of the lower radiator, and a core of the upper radiator and the lower side. It has a derivation path that extends in the left-right direction between the radiator core and the radiator.
The engine cooling system according to claim 1, wherein the other end of the lead-out path in the left-right direction is connected to the lower end of the first connection path and the upper end of the second connection path, respectively. The lead-out path is formed of pipes, and when the saddle-type vehicle is viewed from the front, the pipes of the saddle-type vehicle are more than the portion of the radiator device located on the most side in the left-right direction. 2. The engine cooling system described. The lead-out path is formed by piping, and when the saddle-type vehicle is viewed from the side, the frontmost portion of the piping is the front surface of the lower radiator and the front-rear direction of the saddle-type vehicle. The engine cooling system according to claim 2, wherein the engine cooling system is located at the same position in the above, or at a position behind the front surface of the lower radiator. The engine cooling system according to claim 2, wherein the lead-out path is formed of a metal pipe, and the pipe is fixed to both the upper radiator and the lower radiator via a fixing member. The engine cooling system according to any one of claims 1 to 5, wherein the water pump is attached to a portion of the crankcase of the engine on one side in the left-right direction. A bypass path that guides the cooling water flowing through the radiator inflow path to the radiator outflow path without passing through either the upper radiator core or the lower radiator core.
The flow rate of cooling water that is provided at a position where the bypass path and the radiator outflow path meet and flows through the core of the upper radiator and the core of the lower radiator, respectively, based on the temperature of the cooling water after cooling the engine. Further equipped with a cooling water flow control unit to control
The cooling water flow control unit is arranged on one side in the left-right direction of the saddle-type vehicle and at a position between the engine and the radiator device when the saddle-type vehicle is viewed from the side. The engine cooling system according to any one of claims 1 to 6, wherein the engine cooling system is characterized.

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