JP2019171993A - Motorcycle - Google Patents

Abstract

A motorcycle including a power unit swingably supported by a vehicle body frame and a radiator capable of cooling cooling water from an engine body of a water-cooled engine constituting a part of the power unit. To cool effectively. A radiator (30) is disposed in front of an engine body (14) in a posture inclined forward and upward, and a wind guide passage (42) for guiding traveling wind to the radiator (30) is spaced apart in the vehicle longitudinal direction while leaning upward. It is formed between the front wind guide plate 40a and the rear wind guide plate 40b which are fixedly arranged. [Selection] Figure 2

Description

  The present invention relates to a power unit that is swingably supported by a vehicle body frame while pivotally supporting a rear wheel at a rear portion along a vehicle longitudinal direction, and cooling water from an engine body of a water-cooled engine that constitutes a part of the power unit. The present invention relates to a motorcycle including a radiator capable of cooling the vehicle.

  A motorcycle is known from Patent Document 1 in which a power unit including a water-cooled engine is swingably supported by a vehicle body frame and a radiator is disposed in front of the power unit.

JP-A-11-278343

  However, in the one disclosed in Patent Document 1, the radiator is covered with a vehicle body cover that covers a part of the power unit and the vehicle body frame, and there is a problem in the cooling performance of the radiator by the traveling wind.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a motorcycle capable of effectively cooling a radiator with traveling wind.

  In order to achieve the above object, the present invention provides a power unit that is swingably supported by a vehicle body frame while pivotally supporting a rear wheel at a rear portion along a vehicle longitudinal direction, and a water-cooled type that constitutes a part of the power unit. In a motorcycle including a radiator capable of cooling cooling water from an engine body of an engine, the radiator is disposed in front of the engine body in a posture inclined upward and guides running wind to the radiator. However, the first feature is that the front wind guide plate and the rear wind guide plate that are fixedly arranged at an interval in the vehicle front-rear direction while tilting rearward are formed.

  Further, in addition to the configuration of the first feature, the present invention is covered with a vehicle body cover having a part of the power unit and the vehicle body frame having an under cover that covers the front part of the vehicle body frame from below in front of the power unit, The engine body is covered from below with a rear under cover, the front wind guide plate is integrally connected to the under cover, and the rear wind guide plate is integrally connected to the rear under cover. Two features.

  In addition to the configuration of the second feature, the present invention provides the front wind guide plate that extends rearward from the rear end portion of the under cover toward the upper end portion of the radiator at the rear end portion of the under cover. The rear undercover is disposed with its front end corresponding to the lower end of the radiator, and the rear wind guide plate faces the front wind guide plate while facing the front under cover. A third feature is that the front end portion is integrally provided.

  According to the present invention, in addition to any one of the first to third features, the engine body has a cylinder axis that is inclined forward and is swingably supported by the vehicle body frame. An exhaust pipe connected to a lower side wall of a part of the cylinder head extends backward while curving downward of the power unit, and a catalytic converter interposed in the middle of the exhaust pipe is seen in a side view. The fourth feature is that it is disposed at a position surrounded by the radiator, the cylinder head, and the rear undercover.

  In addition to any of the configurations of the first to fourth features, the present invention provides a pair of cooling water pipes having rigidity so as to support the radiator between the engine body and the radiator. A fifth feature is that the gaps are provided at intervals in the width direction.

  According to the present invention, in addition to the configuration of the fourth feature, a bypass passage capable of circulating cooling water around the radiator is disposed in the vicinity of the connection portion of the exhaust pipe to the cylinder head. Six features.

  Furthermore, in addition to the configuration of the sixth feature, the present invention provides a water pump for circulating cooling water on both sides in the vehicle width direction of the cylinder head, and cooling water to the bypass passage formed in the cylinder head. A seventh feature is that a thermostat for controlling the flow rate is provided.

  According to the first aspect of the present invention, the front portion is fixedly arranged at an interval in the vehicle front-rear direction while being inclined rearwardly toward the radiator in front of the engine body in a posture inclined forwardly upward. Since the traveling wind flows from the wind guide passage formed between the wind guide plate and the rear wind guide plate, the radiator can be effectively cooled.

  According to the second feature of the present invention, the front wind guide plate is integrally connected to the under cover of the vehicle body cover, and the rear wind guide plate is integrally connected to the rear under cover. The air guide passage can be formed without increasing.

  According to the third aspect of the present invention, the front wind guide plate extending rearwardly toward the upper end of the radiator is integrally connected to the rear end of the cover member, and the position corresponds to the lower end of the radiator. Since the rear wind guide plate facing the front wind guide plate is integrally connected to the front end portion of the rear under cover disposed at the front, the running wind below the vehicle body is effectively guided to the radiator side, and the radiator is It can cool more effectively.

  According to the fourth aspect of the present invention, the exhaust pipe connected to the front wall of the cylinder head extends backward while curving downward in the power unit, and is installed in the middle of the exhaust pipe. However, in a side view, the position is surrounded by the radiator, the cylinder head and the rear under cover, so that the catalytic converter with heat is placed behind the radiator, and the thermal influence from the catalytic converter reaches the radiator. The radiator can be arranged by effectively utilizing the space below the cylinder head and above the rear undercover while preventing the cooling efficiency of the radiator from decreasing as much as possible.

  According to the fifth feature of the present invention, since a pair of rigid cooling water pipes are provided between the engine body and the radiator at intervals in the vehicle width direction, a dedicated stay or the like for supporting the radiator is provided. It can reduce and it can contribute to reduction of a number of parts.

  According to the sixth aspect of the present invention, since the bypass passage that bypasses the radiator is disposed in the vicinity of the connection portion of the exhaust pipe to the cylinder head, the cooling water flowing through the bypass passage at the cold start of the engine Heat from the surroundings of the exhaust pipe connection to the cylinder head can be warmed, contributing to early engine warm-up.

  Furthermore, according to the seventh feature of the present invention, the water pump and the thermostat are arranged on both sides of the cylinder head in the vehicle width direction, and the bypass passage is formed in the cylinder head. Therefore, the bypass passage is formed outside the engine body. Therefore, it is possible to enhance the heat receiving effect of the bypass passage while making it unnecessary to provide external piping.

1 is a left side view of a motorcycle. Fig. 2 is a left side view of the motorcycle shown with a part broken away. FIG. It is a figure which shows typically the cooling water circulation path | route of an engine.

  An embodiment of the present invention will be described with reference to FIGS. In the following description, front and rear, left and right, and top and bottom are directions as viewed from a passenger riding a motorcycle.

  1 and 2, a body frame F of the scooter type motorcycle includes a head for supporting a front fork 5 that pivotally supports a front wheel WF and a steering handle 6 connected to the front fork 5 in a steerable manner. A pipe 7 is provided at the front end, and a power unit P that exerts power for driving the rear wheel WR is supported at a middle part in the front-rear direction of the body frame F so as to be swingable up and down.

  The vehicle body frame F includes a head pipe 7, a down frame 8 extending downward from the head pipe 7, a pair of left and right lower frames 9 connected to a lower portion of the down frame 8, and a pair of lower frames 9. A cross member 10 that connects the rear ends, a pair of left and right center frames 11 that rise upward from the rear ends of the pair of lower frames 9, and an upper end of the center frames 11 that are integrally connected and extend rearwardly. A pair of left and right seat rails 12 are provided.

  The power unit P includes a water-cooled engine E disposed in front of the rear wheel WR and a transmission M that transmits the output of the engine E to the rear wheel WR. The transmission M is an engine of the engine E. It is housed in a transmission case 15 connected to the main body 14 and extending to the left side of the rear wheel WR.

  The vehicle body frame F and a part of the power unit P are a vehicle body cover 16 having a pair of left and right footrests 17 on which occupants' feet are placed, and a floor tunnel portion 18 protruding upward between the footrests 17. The body cover 16 is covered and attached to the body frame F. An occupant seat 19 disposed behind the floor tunnel portion 18 and a passenger seat 20 disposed behind the occupant seat 19 are disposed on the vehicle body cover 16.

  The engine body 14 includes a crankcase 22 to which the transmission case 15 is coupled, a cylinder body 23 connected to the front upper portion of the crankcase 22, a cylinder head 24 coupled to the upper portion of the cylinder body 23, The cylinder cover 24 is coupled to the cylinder head 24, and the cylinder axis C of the engine body 14 is slightly inclined forwardly. The crankcase 22 of the engine body 14 is supported by the seat rail 12 of the vehicle body frame F so as to be swingable via a link mechanism 26, and between the rear portion of the transmission case 15 and the seat rail 12. Is provided with a rear cushion unit 27.

  A fuel tank 28 covered from above by the floor tunnel portion 18 of the vehicle body cover 16 is supported by the vehicle body frame F in front of the engine main body 14 in the power unit, and in front of the engine main body 14 and the fuel tank 28. On the rear side, a radiator 30 having a fan 29 on the back side is disposed in a posture inclined upward.

  An intake device 31 connected to the upper side wall of the cylinder head 24 is disposed above the transmission case 15 on the left side of the rear wheel WR and is supported by the transmission case 15, and the air cleaner 32. And a throttle body 33 disposed between the cylinder heads 24, and a fuel injection valve 34 is attached to the upper side wall of the cylinder head 24.

  Referring also to FIG. 3, an exhaust device 35 for discharging exhaust gas is connected to the lower side wall of the cylinder head 24, and the exhaust device 35 is connected to the lower side wall of the cylinder head 24. And an exhaust muffler 38 disposed on the right side of the rear wheel WR so as to be connected to the downstream end of the exhaust pipe 36. The exhaust pipe 36 extends rearward while curving toward the lower side of the power unit P, and a catalytic converter 37 is interposed in the middle of the exhaust pipe 36.

  An under cover 40 constituting a part of the vehicle body cover 16 is disposed in front of the power unit P so as to cover the front part of the vehicle body frame F and the fuel tank 28 from below, and a part of the power unit P The engine main body 14 of the water-cooled engine E constituting the engine is covered from below with an engine guard 41 as a rear undercover.

  In addition, an air guide passage 42 that guides the traveling wind to the radiator 30 is formed between the front air guide plate 40a and the rear air guide plate 40b that are fixedly arranged at intervals in the vehicle front-rear direction while inclining backward. The front air guide plate 40 a is integrally connected to the under cover 40, and the rear air guide plate 40 b is integrally connected to the engine guard 41.

  The front air guide plate 40a is integrally connected to the rear end portion 40b of the under cover 40 so as to extend rearward from the rear end portion 40b of the under cover 40 toward the upper end portion of the radiator 30. Established. The engine guard 41 is disposed with its front end portion 41b corresponding to the lower end portion of the radiator 30, and the rear wind guide plate 41a faces the front wind guide plate 40a while the front end portion of the engine guard 41 is disposed. 41b is integrally connected to 41b.

  Paying attention to FIG. 2, the front part of the engine guard 41 is formed to be inclined so as to rise forward behind the cross member 10 in order to avoid the cross member 10 in the vehicle body frame F. Above the cross member 10, the front end portion 41 b of the engine guard 41 is disposed at a position adjacent to the lower end portion of the radiator 30 from below. The rear wind guide plate 41a is integrally connected to the front end portion 41b of the engine guard 41 so as to form a mountain shape across the cross member 10 in a side view together with the front portion of the engine guard 41, It is formed to incline forward and downward from the front end portion 41b.

  As clearly shown in FIG. 2, the catalytic converter 37 interposed in the middle of the exhaust pipe 36 is disposed at a position surrounded by the radiator 30, the cylinder head 24, and the engine guard 41 in a side view.

  In FIG. 4, a jacket (not shown) through which cooling water flows is formed in the cylinder body 23 and the cylinder head 24 of the engine body 14, and the radiator 30 is provided by a water pump 44 that circulates cooling water. The cooling water drawn from the refrigerant flows through the jacket from the cylinder body 23 to the cylinder head 24. The water pump 44 is coaxially connected to a camshaft (not shown) of a valve operating device housed between the cylinder head 24 and the head cover 25, and is driven to rotate by the camshaft.

  In the vicinity of the connection portion 39 of the exhaust pipe 36 to the cylinder head 24, a bypass passage 46 that allows the coolant to flow around the radiator 30 is disposed. The bypass passage 46 is formed in the head 24. The cooling water that has flowed through the jacket of the cylinder body 23 and the cylinder head 24 is returned to the radiator 30 via a thermostat 45 that controls the flow rate of the cooling water to the bypass passage 46. When the engine main body 14 is cold, the cooling water is circulated through the bypass passage 46 by restricting the cooling water flowing to the radiator 30 as shown by a chain line arrow 49 in FIG. Sometimes, as indicated by the dotted arrow 50 in FIG. 4, the cooling water flows to the bypass passage 46 and functions to return the cooling water to the radiator 30.

  By the way, the water pump 44 and the thermostat 45 are disposed on both sides of the cylinder head 24 in the vehicle width direction. In this embodiment, the water pump is disposed on the right side wall of the cylinder head 24 in the vehicle width direction. 44 is disposed, and the thermostat 45 is disposed on the left side wall of the cylinder head 24 in the vehicle width direction.

  In addition, a pair of rigid cooling water pipes 47 and 48 are provided between the engine body 14 and the radiator 30 so as to support the radiator 30 with an interval in the vehicle width direction. In the embodiment, the cooling water is sucked from the radiator 30 by the water pump 44 so that the first cooling water pipe 47 made of a light metal such as aluminum is provided on the right side wall of the cylinder head 24 and the lower right side of the radiator 30. A second cooling water pipe 48 made of a light metal such as aluminum is provided between the side walls so as to return the cooling water from the thermostat 45 to the radiator 30, and the left side wall of the cylinder head 24 and the lower left side of the radiator 30. Provided between the side walls.

  A stay 51 that supports the upper portion of the radiator 30 is attached to the head cover 25 of the engine body 14.

  Next, the operation of this embodiment will be described. A radiator 30 capable of cooling the cooling water from the engine main body 14 of the water-cooled engine E constituting a part of the power unit P that is swingably supported by the vehicle body frame F. However, it is arranged in front of the engine body 14 in a posture inclined forwardly upward, and an air guide passage 42 that guides the traveling wind to the radiator 30 is fixedly arranged with an interval in the vehicle front-rear direction while inclining backwardly upward. Is formed between the front air guide plate 40a and the rear air guide plate 40b, so that traveling wind flows from the air guide passage 42 toward the radiator 30 in front of the engine body 14 in a posture inclined forwardly upward. Thus, the radiator 30 can be effectively cooled.

  Further, the front part of the vehicle body frame F is covered with the under cover 40 from below, the engine main body 14 is covered with the engine guard 41 from below, and the front wind guide plate 40a is integrally connected to the under cover (40, Since the rear air guide plate 40b is integrally connected to the engine guard 41, the air guide passage 42 can be formed without increasing the number of parts.

  Further, the front wind guide plate 40a extending rearwardly from the rear end portion 40b of the under cover 40 toward the upper end portion of the radiator 30 is integrally connected to the rear end portion 40b of the under cover 40, The engine guard 41 is disposed with its front end portion 41b corresponding to the lower end portion of the radiator 30, and the rear wind guide plate 41a faces the front wind guide plate 40a while the front end portion 41b of the engine guard 41 is located. Therefore, it is possible to effectively guide the traveling wind below the vehicle body toward the radiator 30 and cool the radiator 30 more effectively.

  Further, the engine body 14 has a cylinder axis C inclined forwardly upward and is swingably supported by the vehicle body frame F, and is connected to a lower side wall of a cylinder head 24 constituting a part of the engine body 14. An exhaust pipe 36 extends rearward while curving downward of the power unit P, and a catalytic converter 37 interposed in the middle of the exhaust pipe 36 includes the radiator 30, the cylinder head 24, and the Since it is disposed at a position surrounded by the engine guard 41, the catalytic converter 37 having heat is disposed behind the radiator 30, and the heat influence from the catalytic converter 37 is prevented from reaching the radiator 30 as much as possible. Thus, while preventing the cooling efficiency of the radiator 30 from being lowered, the lower side of the cylinder head 24 and the upper side of the engine guard 41 It is possible to arrange the radiator 30 by effectively utilizing the over scan.

  Further, between the engine body 14 and the radiator 30, a pair of rigid cooling water pipes 47 and 48 are provided so as to support the radiator 30 with an interval in the vehicle width direction. It is possible to reduce the number of stays dedicated to support and reduce the number of parts.

  In addition, a bypass passage 46 that can circulate cooling water bypassing the radiator 30 is disposed in the vicinity of the connection portion 39 of the exhaust pipe 36 to the cylinder head 24. The cooling water flowing through 46 can be warmed by the heat from the periphery of the connection portion 39 of the exhaust pipe 36 to the cylinder head 24, which can contribute to the early warming up of the engine E.

  Further, water pumps 44 for circulating cooling water and thermostats 45 for controlling the flow rate of cooling water to the bypass passage 46 formed in the cylinder head 24 are arranged on both sides of the cylinder head 24 in the vehicle width direction. Therefore, it is possible to enhance the heat receiving effect of the bypass passage 46 while eliminating the need to provide external piping for forming the bypass passage 46 outside the engine body 14.

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

  For example, in the above-described embodiment, the case where the engine guard 41 is applied as a rear undercover that covers the engine main body 14 from below has been described. However, the present invention is not limited to the engine guard. The member which comprises and covers the engine main body 14 from the lower part may be sufficient.

14 ... Engine body 16 ... Car body cover 24 ... Cylinder head 30 ... Radiator 36 ... Exhaust pipe 37 ... Catalytic converter 40 ... Under cover 40a ... Front wind guide plate 40b: Rear end 41 of the undercover ... Engine guard 41a as the rear undercover ... Rear air guide plate 41b ... Front end 42 of the engine guard ... Air guide passage 44 ... Water Pump 45 ... Thermostat 46 ... Bypass passage 47, 48 ... Cooling water pipe C ... Cylinder axis E ... Engine F ... Body frame P ... Power unit WR ... Rear wheel

Claims (7)

  A power unit (P) that is swingably supported by the vehicle body frame (F) while pivotally supporting a rear wheel (WR) at a rear portion along the vehicle longitudinal direction, and a water-cooled type that constitutes a part of the power unit (P) In a motorcycle including a radiator (30) capable of cooling cooling water from the engine body (14) of the engine (E), the radiator (30) is inclined in a forwardly rising posture of the engine body (14). A front wind guide plate (40a) disposed forward and having a wind guide passage (42) for guiding running wind to the radiator (30) fixedly spaced apart in the vehicle front-rear direction while inclining rearwardly; A motorcycle formed between the rear wind guide plates (40b).   A vehicle body cover (16) having an under cover (40) in which a part of the power unit (P) and the vehicle body frame (F) cover the front portion of the vehicle body frame (F) from below in front of the power unit (P). The engine main body (14) is covered from below with a rear under cover (41), the front air guide plate (40a) is integrally connected to the under cover (40), and the rear air guide plate The motorcycle according to claim 1, wherein (40b) is integrally connected to the rear under cover (41).   The front wind guide extending rearwardly from the rear end (49b) of the undercover (40) toward the upper end of the radiator (30) toward the rear end (40b) of the undercover (40) A plate (40a) is integrally provided, the rear under cover (41) is arranged with its front end (41b) corresponding to the lower end of the radiator (30), and the rear air guide plate (41a) The motorcycle according to claim 2, wherein the motorcycle is integrally connected to a front end portion (41b) of the rear under cover (41) while facing the front air guide plate (40a).   The engine body (14) has a cylinder axis (C) inclined forward and is supported by the body frame (F) so as to be swingable, and constitutes a part of the engine body (14). 24) an exhaust pipe (36) connected to the lower side wall of the power supply unit (P), extending backward while being curved downward, and is provided in the middle of the exhaust pipe (36). (37) is arrange | positioned in the position enclosed by the said radiator (30), the said cylinder head (24), and the said rear undercover (41) by a side view, The any one of Claims 1-3 characterized by the above-mentioned. Motorcycle according to item.   Between the engine body (14) and the radiator (30), a pair of cooling water pipes (47, 48) having rigidity so as to support the radiator (30) is spaced in the vehicle width direction. The motorcycle according to any one of claims 1 to 4, wherein the motorcycle is provided.   A bypass passage (46) through which cooling water can be circulated bypassing the radiator (30) is disposed in the vicinity of the connection portion (39) of the exhaust pipe (36) to the cylinder head (24). The motorcycle according to claim 4, wherein the motorcycle is characterized by the following.   A water pump (44) that circulates cooling water on both sides of the cylinder head (24) in the vehicle width direction and a circulation amount of the cooling water to the bypass passage (46) formed in the cylinder head (24). The motorcycle according to claim 6, further comprising a thermostat (45) to be controlled.

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