JP3686077B2 - Radiator device for vehicle - Google Patents

Description

According to the present invention, a bracket is provided on an upper part of an engine block constituting a crankcase of an engine main body in a posture in which an axis line of a cylinder bore is substantially aligned with a longitudinal direction of the body frame, and the bracket is connected to the body frame via a pivot shaft a swingably supported, the cooling fan on the end of the crankshaft is rotatably supported by the crankcase is fixed, the upper and lower tanks which are arranged along the longitudinal direction of the body frame, they The radiator provided with the cooling core which connects between these tanks is related with the radiator apparatus for vehicles arrange | positioned facing the said cooling fan.

2. Description of the Related Art Conventionally, a vehicle is known in which a radiator is attached to an engine body mounted on a vehicle body frame so as to be disposed on a side of a cylinder bore provided in the engine body (see, for example, Patent Document 1 below).
Japanese Utility Model Publication No.59-78128

  An object of the present invention is to provide a vehicle radiator device that can arrange a radiator while avoiding a pivot shaft.

In order to achieve the above object, the invention according to claim 1 is provided with a bracket on an upper part of an engine block constituting a crankcase of an engine body in a posture in which the axis of the cylinder bore is substantially along the longitudinal direction of the body frame, the bracket is supported to freely swing in the vehicle body frame via a pivot shaft, the cooling fan on the end of the crankshaft is rotatably supported is fixed in the crank case, along the longitudinal direction of the body frame In the radiator device for a vehicle, wherein the radiator including the upper and lower tanks arranged in this manner and the cooling core connecting between the tanks is arranged to face the cooling fan, so as to avoid the pivot shaft recessed upper portion of the upper tank are formed, the front end of the radiator in front of the said pivot axis With the location, of the radiator, the front portion than said pivot axis, the doorway of the cooling water circulating water jacket of the engine block is characterized in that it is arranged.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, an exhaust pipe connected to the exhaust port of the engine block, wherein the radiator is disposed so as to be inclined rearward with respect to the axis of the cylinder bore. Is routed behind the radiator and rearward of the rear part.

According to a third aspect of the present invention, in addition to the configuration of the second aspect of the present invention, a water supply pipe extending upward is integrally formed at the rear end of the upper tank so that a water supply cap is attached to the upper end. The other end of the conduit provided at one end to the engine body is connected to the front portion of the upper tank at a position sandwiching the pivot shaft between the pipe and the water supply pipe.

Furthermore the invention of claim 4, wherein, in addition to the configuration of the invention described in claim 3, wherein the pivot shaft is arranged below the upper end of the water supply cap in side view, the synthetic resin of the radiator cover The water supply cap and the lower tank lower part are covered .

  According to the configuration of the present invention, it is possible to arrange the radiator while avoiding the pivot shaft.

In particular, according to the invention of claim 2, the radiator is disposed so as to avoid the pivot shaft while the radiator is disposed so as to avoid the pivot shaft by tilting the radiator rearwardly with respect to the axis of the cylinder bore. It is possible to improve the degree of freedom in handling the exhaust pipe by securing a space for rearward arrangement.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on examples of the present invention shown in the accompanying drawings.

  1 to 8 show an embodiment of the present invention. FIG. 1 is an overall side view of a scooter type motorcycle, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. FIG. 4 is a side view taken along line 4-4 in FIG. 3, FIG. 5 is a side view corresponding to FIG. 4 with the radiator cover removed, and FIG. FIG. 7 is a cross-sectional view taken along line 6, FIG. 7 is a plan view taken along arrow 7 in FIG. 6, and FIG. 8 is a perspective view of the radiator and the radiator cover.

  1 and 2, a vehicle body frame F of a scooter type motorcycle V having a front wheel Wf that is steered by a steering handle 11 and a rear wheel Wr that is driven by a swing type power unit P is a front frame. 12 is divided into a center frame 13 and a rear frame 14. The front frame 12 is composed of an aluminum alloy casting that integrally includes a head pipe 12a, a down tube 12b, and a step floor support portion 12c. A center frame 13 on which the power unit P is supported so as to be swingable up and down via a pivot shaft 15 is made of an aluminum alloy casting and is coupled to the rear end of the front frame 12. The rear frame 14 extending rearward and upward of the power unit P is composed of an annular pipe material, and a fuel tank 16 is supported on the upper surface thereof. A helmet case 17 is supported on the upper surface of the center frame 13, and the helmet case 17 and the fuel tank 16 are covered with a cover 19 having a seat 18 integrally.

  The power unit P includes a water-cooled single-cylinder four-cycle engine E and a belt-type continuously variable transmission T extending from the left side surface of the engine E to the rear of the vehicle body. To the rear end of the center frame 13. An air cleaner 21 is supported on the upper surface of the continuously variable transmission T, a muffler 22 is supported on the right side surface of the continuously variable transmission T, and a main stand 23 that can stand up and down is supported on the lower surface of the engine E.

  3 to 5, the engine body 25 of the engine E includes a first engine block 32 and a second engine block 33 that are divided by a split surface 30 that extends in the vertical direction along the crankshaft 31. The engine block 32 is integrally provided with a cylinder block 32a provided with a cylinder bore 41 and a crankcase half portion 32b that constitutes a crankcase together with the second engine block 33. A cylinder head 34 is disposed at the front end of the first engine block 32. The head cover 35 is coupled to the front end of the cylinder head 34.

  Such an engine main body 25 is mounted on the vehicle body frame F so that the axis L of the cylinder bore 41 rises slightly forward and substantially follows the front-rear direction of the vehicle body frame F. A bracket 27 provided on the pivot frame 15 is supported on a pivot shaft 15 fixed to the center frame 13 of the vehicle body frame F via a mount rubber 28 so as to be swingable.

  The belt-type continuously variable transmission T includes a right casing 37 and a left casing 38 that are coupled to each other. The front right side surface of the right casing 37 is the left side surface of the first and second engine blocks 32 and 33. Combined with Further, a speed reducer casing 39 is coupled to the rear right side surface of the right casing 37.

  A piston 42 slidably fitted into a cylinder bore 41 provided in the first engine block 32 is connected to the crankshaft 31 via a connecting rod 43. A cam shaft 44 is rotatably supported on the cylinder head 34, and an intake valve and an exhaust valve (not shown) provided on the cylinder head 34 are driven to open and close by the cam shaft 44. A timing chain 45 is accommodated in a chain passage 40 provided in the first engine block 32, and the timing chain 45 includes a drive sprocket 46 provided on the crankshaft 31 and a driven sprocket 47 provided on the camshaft 44. Wrapped around. As a result, the camshaft 44 rotates once for every two rotations of the crankshaft 31.

  A drive pulley 54 is provided at the left end of the crankshaft 31 protruding into the right casing 37 and the left casing 38. The drive pulley 54 includes a fixed-side pulley half 55 fixed to the crankshaft 31 and a movable-side pulley half 56 that can approach and separate from the fixed-side pulley half 55. The half body 56 is urged in a direction approaching the stationary pulley half body 55 by a centrifugal weight 57 that moves radially outward in accordance with an increase in the rotational speed of the crankshaft 31.

  A driven pulley 59 provided on an output shaft 58 supported between the rear portion of the right casing 37 and the speed reducer casing 39 includes a fixed pulley half 60 supported on the output shaft 58 so as to be relatively rotatable, and a fixed pulley half. A movable pulley half 61 that can approach and separate from the body 60 is provided, and the movable pulley half 61 is biased toward the fixed pulley half 60 by a spring 62. A starting clutch 63 is provided between the stationary pulley half 60 and the output shaft 58. An endless V-belt 64 is wound around the drive pulley 54 and the driven pulley 59.

  An intermediate shaft 65 and an axle 66 that are parallel to the output shaft 58 are supported between the right casing 37 and the reduction gear casing 39, and a reduction gear train 67 is provided between the output shaft 58, the intermediate shaft 65, and the axle 66. A rear wheel Wr is provided at the right end of the axle 66 that passes through the reduction gear casing 39 and protrudes to the right.

  Thus, the rotational power of the crankshaft 31 is transmitted to the drive pulley 54, and is transmitted from the drive pulley 54 to the rear wheel Wr via the V belt 64, the driven pulley 59, the starting clutch 63 and the reduction gear train 67. .

  Since the centrifugal force acting on the centrifugal weight 57 of the drive pulley 54 is small when the engine E rotates at a low speed, the groove width between the fixed pulley half 60 and the movable pulley half 61 is reduced by the spring 62 of the driven pulley 59. The gear ratio is LOW. When the rotational speed of the crankshaft 31 increases from this state, the centrifugal force acting on the centrifugal weight 57 increases, and the groove width between the fixed pulley half 55 and the movable pulley half 56 of the drive pulley 54 decreases, Along with this, the groove width between the stationary pulley half 60 and the movable pulley half 61 of the driven pulley 59 increases, so that the gear ratio changes steplessly from LOW to TOP.

  Referring also to FIG. 6, a rotor 69 is fixed to the right side of the crankshaft 31, and a stator 70 that cooperates with the rotor 69 and constitutes the AC generator 68 is surrounded by the rotor 69. Are fixed to the first and second engine blocks 32 and 33. A cooling fan 71 is fixed to the right end portion of the crankshaft 31 outside the alternator 68, and a radiator 72 is disposed so as to sandwich the cooling fan 71 between the alternator 68. A support case 73 included in the radiator 72 is fixed to the first and second engine blocks 32 and 33 so as to surround the cooling fan 71, and the radiator 72 is externally attached by a synthetic resin radiator cover 74 fastened to the support case 73 of the radiator 72. Covered from the side.

  Referring to FIGS. 7 and 8 together, a louver 75 for introducing air from the outside is provided on the outer surface of the radiator cover 74, and a plurality of support cases 73 are provided on the side of the cooling fan 71. When the cooling fan 71 is operated, the air introduced from the louver 75 passes through the radiator 72 to cool the radiator 72 and is discharged to the outside through the discharge port 76. It will be.

The radiator 72 includes an upper tank 77, a lower tank 78, a cooling core 79 that connects the upper and lower tanks 77, 78, and the support case 73. The support case 73 is an upper and lower tank 77. , 78. Thus, the cooling air introduced from the louver 75 to the radiator 72 side passes through the cooling core 79 to cool the cooling water in the radiator 72. The upper tank 77 is formed in a concave shape so that its upper portion avoids the pivot shaft 15.

  The radiator 72 constitutes a part of a cooling device 83 that can circulate cooling water of a water jacket 82 provided in the cylinder block 32a of the first engine block 32 and the cylinder head 34 in the engine body 25, and The cooling device 83 bypasses the water pump 84 for supplying cooling water to the water jacket 82, the radiator 72 interposed between the water jacket 82 and the suction port of the water pump 84, and the radiator 72. A thermostat 85 for switching the state of returning the cooling water from the water jacket 82 to the water pump 84 and the state of returning the cooling water from the water jacket 82 to the water pump 84 via the radiator 72 according to the temperature of the cooling water. .

  A thermostat case 86 in which a thermostat 85 is housed is coupled to the right side surface of the cylinder head 34, and a water pump 84 provided at the right end of the camshaft 44 is surrounded by the cylinder head 34 and the thermostat case 86. It is stored in.

A water supply pipe 87 extending upward is integrally provided at one end portion (rear end portion in this embodiment) of the upper tank 77 along the front-rear direction of the vehicle body frame F, and the upper end of the water supply pipe 87 is rotated. A water supply cap 88 that is opened and closed by operation is attached. Further, a connecting pipe 89 projecting forward is integrally provided at the other end portion (the front end portion in this embodiment) of the lower tank 78 along the front-rear direction of the body frame F. Thus, the pivot shaft 15 is disposed below the upper end of the water supply cap 88 in a side view, and the radiator cover 74 covers the water supply cap 88 and the lower tank 78 below.

Such radiator 72 is attached to first and the first engine block 32 and 33 of the engine body 25 in a posture which is inclined rearwardly upwards by an angle α relative to the axis L of the cylinder bore 41 in which the engine body 25 is provided, thereby When the engine body 25 is mounted on the vehicle body frame F, the radiator 72 is inclined forward by an angle β with respect to the horizontal plane, the water supply cap 88 is disposed at the uppermost position in the cooling device 83, and the connection pipe 89. Is disposed at the lowest position in the cooling device 83. An exhaust pipe 90 connected to the exhaust port of the cylinder head 32 is routed behind the radiator 72 and rearward thereof.

In this way, the radiator 72 is inclined so as to be rearwardly raised by the angle α with respect to the axis L of the cylinder bore 41, so that the radiator 72 is avoided so as to avoid the pivot shaft 25 for supporting the engine body 25 on the vehicle body frame F. it becomes possible to place, the exhaust pipe 90, so as to ensure a space for arranging the rear behind the radiator 72 can be improved maneuverability freedom of the exhaust pipe 90.

One end of a first conduit 91 such as a rubber hose that guides the coolant of the radiator 72 to the thermostat 85 side is connected to the connection pipe 89 serving as a coolant outlet of the radiator 72, and the other end of the first conduit 91 is connected to a thermostat case 86. Connected to.

The radiator 72 is disposed at a position where at least a part of the upper tank 77 (the front part in this embodiment) overlaps the cylinder block 32a of the engine body 25 in a side view. The upper tank 77 and the cylinder block 32a A second conduit 92 having one end connected to the cylinder block 32a so as to be continuous with the upper portion of the water jacket 82 is disposed so as to extend substantially horizontally in the width direction of the motorcycle in the overlapping range in the side view. The other end of the second conduit 92 is connected to a front portion serving as a cooling water inlet of the upper tank 77 at a position where the pivot shaft 15 is sandwiched between the second conduit 92 and the water supply pipe 87 .

Thus, the front end of the radiator 72 is disposed in front of the pivot shaft 15, and the inlet / outlet of the cooling water is disposed in a portion of the radiator 72 in front of the pivot shaft 15.

  Further, one end of a third conduit 93 such as a rubber hose for guiding cooling water from the water pump 84 is connected to the thermostat case 86, and the other end of the third conduit 93 communicates with the lower portion of the water jacket 82. The block 32 is connected to a connecting pipe 94 provided in the cylinder block 32a.

  The carburetor 95 connected to the intake port of the cylinder head 32 is connected to a conduit (not shown) for guiding cooling water from the water jacket 82 in order to heat the carburetor 95. A fourth conduit 96 such as a rubber hose for guiding the cooling water after heating 95 to the thermostat 85 is connected to the thermostat case 86.

  A fifth conduit 97 such as a rubber hose for extracting air from the water pump 84 is connected to the upper portion of the thermostat case 86, and a cylinder is used to extract air from the fifth conduit 97 and the upper portion in the water jacket 82. A conduit (not shown) connected to the upper portion of the block 32 a is connected in common to a sixth conduit 98 such as a rubber hose, and this sixth conduit 98 is connected to the upper rear side of the upper tank 77 in the radiator 72. Is done.

  Further, one end of a seventh conduit 100 such as a rubber hose is connected to the water supply pipe 87, and the other end of the seventh conduit 100 is opened to the atmosphere and is a reservoir (not shown) disposed separately from the radiator 72. Connected to. Thus, when the cooling water in the radiator 72 expands at a high temperature, excess cooling water overflows into the reservoir. When the cooling water in the radiator 72 becomes low temperature, the cooling water returns from the reservoir to the radiator 72. It is. Due to the circulation of the cooling water between the radiator 72 and the reservoir, the air accumulated in the water supply pipe 87 is discharged to the reservoir. In other words, the air venting from the cooling device 83 is favorably performed even when the engine E is in operation.

  In such a cooling device 83, in a state where the warm-up operation of the engine E is completed, the cooling water discharged from the water pump 84 driven by the camshaft 44 passes through the thermostat case 86 and the third conduit 93 for the first time. The water is supplied to the water jacket 82 in the engine block 32 and the cylinder head 34, and after cooling the engine E while passing through the water jacket 82, it is supplied to the upper tank 77 of the radiator 72 through the second conduit 92. Then, the cooling water whose temperature has decreased while passing through the radiator 72 so as to flow from the upper tank 77 through the cooling core 79 to the lower tank 78 is returned to the water pump 84 through the first conduit 91 and the thermostat 85. On the other hand, when the engine E is warming up and the cooling water temperature is low, the thermostat 85 operates so that the cooling water circulates around the radiator 72, and the cooling water does not pass through the radiator 72. 82, the vaporizer 95 and the water pump 84 are circulated to quickly increase the temperature.

  Referring to FIGS. 7 and 8, the radiator cover 74 fastened to the support case 72 of the radiator 72 so as to cover the radiator 72 is engaged with the water supply cap 88 in the closed position so that the radiator cover 74 is A position restricting portion 74 a that enables attachment to the radiator 72 and prevents the water supply cap 88 from rotating to the open position is integrally provided so as to cover the water supply cap 88. Moreover, the position restricting portion 74a is provided with a notch 99 that allows a part of the water supply cap 88 to face the outside.

  Next, the operation of this embodiment will be described. In the radiator 72 constituting a part of the cooling device 83 that can circulate the cooling water of the water jacket 82 provided in the engine body 25, the upper tank along the front-rear direction of the vehicle body frame F is described. A water supply pipe 87 extending upward is integrally provided at a rear end portion of the water supply 77, and a water supply cap 88 is detachably attached to an upper end of the water supply pipe 87. The water supply cap 88 is disposed inside the cooling device 83. The radiator 72 is attached to the engine body 25 so as to be inclined at an angle β with respect to the horizontal plane so as to be in the uppermost position. That is, the radiator 72 having a general shape including the upper and lower tanks 77 and 78 and the cooling core 79 connecting the tanks 77 and 78 is tilted forward with respect to the horizontal plane, so that the rear of the upper tank 77 is obtained. A cap 88 attached to the upper end of the water supply pipe 87 provided at the end is disposed at the uppermost position in the cooling device 83.

  Therefore, it is possible to avoid an increase in cost due to a special shape of the radiator 72, or by providing a water supply cap in a tank that is connected to the radiator 72 and arranged separately from the radiator 72, and at the time of water injection from the water supply pipe 87 The head difference in the cooling device 83 can be made relatively large, and air bleedability and water injection from the water supply pipe 87 can be improved.

  Moreover, a connecting pipe 89 for connecting a first conduit 91 for guiding cooling water from the radiator 72 to the thermostat 85 is provided at the front end portion of the lower tank 78 along the front-rear direction of the vehicle body frame F. The inclination posture of the radiator 72 with respect to the horizontal plane is set so as to be the lowermost position in the device 83, and air is favorably supplied from the lower portion in the cooling device 83 without increasing the length of the cooling core 79 in the radiator 72. The water injection is further improved.

  A radiator 72 is arranged at a position where at least a part of the upper tank 77 overlaps the cylinder block 32a in a side view, and the upper tank 77 and the cylinder block 32a are arranged in a range overlapping with the side view and extend substantially horizontally. Since one end of the two conduits 92 is connected to the cylinder block 32 a so as to be continuous with the water jacket 82, and the other end of the second conduit 92 is connected to the upper tank 77, the cooling water is circulated between the water jacket 82 and the radiator 72. Therefore, the second conduit 92 connecting the radiator 72 and the cylinder block 32a can be shortened, and the cooling water circulation circuit in the cooling device 83 can be made compact.

  Further, the water supply cap 88 is covered with a position restricting portion 74a that engages with the water supply cap 88 in the closed position to allow the radiator cover 74 to be attached to the radiator 72 and prevents the water supply cap 88 from rotating to the open position. Thus, when the radiator cover 74 is attached to the radiator 72, when the water supply cap 88 is in the closed position, the position restricting portion 74a is engaged with the water supply cap 88 when the radiator cover 74 is attached to the radiator 72. A cover 74 can be attached to the radiator 72. Therefore, it is not necessary to specifically check that the water supply cap 88 is in the closed position, and the position of the water supply cap 88 can be confirmed only by attaching the radiator cover 74 to the radiator 72, thereby improving the assemblability. Can do.

  In addition, since the position restricting portion 74a of the radiator cover 74 is engaged with the water supply cap 88, the water supply cap 88 is prevented from rotating from the closed position to the open position, so that an increase in the number of parts is avoided. Can be maintained in its closed position.

  The position restricting portion 74 a is provided with a notch 99 that allows a part of the water supply cap 88 to face the outside, so that the presence of the water supply cap 88 can be easily confirmed from the outside of the radiator cover 74.

  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. It is.

  For example, although the case where the present invention is applied to the motorcycle V has been described in the above embodiment, the present invention is also applicable to other vehicles such as a motor tricycle.

1 is an overall side view of a scooter type motorcycle. FIG. It is a principal part enlarged view of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a side view taken along line 4-4 in FIG. 3. FIG. 5 is a side view corresponding to FIG. 4 with a radiator cover removed. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a plan view taken along arrow 7 in FIG. 6. It is a perspective view of a radiator and a radiator cover.

Explanation of symbols

15 ... Pivot shaft 25 ... Engine body 27 ... Bracket 32 ... Engine block 41 ... Cylinder bore 71 ... Cooling fan 72 ... Radiator
74 ... Radiator cover 77 ... Upper tank 78 ... Lower tank 79 ... Cooling core
82 ... Water jacket 87 ... Water supply pipe 88 ... Water supply cap
90 ... exhaust pipe 92 ... conduit F ... body frame
L ... Axis

Claims (4)

A bracket (27) is provided on the upper part of the engine block (32) constituting the crankcase of the engine body (25) in such a posture that the axis (L ) of the cylinder bore (41) is substantially aligned with the longitudinal direction of the body frame (F). is, the bracket (27) is supported freely swing in the vehicle body frame (F) via a pivot shaft (15), the end of the rotatably journaled by the crankshaft (31) in the crankcase A cooling fan (71) is fixed, and upper and lower tanks (77, 78) arranged along the front-rear direction of the vehicle body frame (F), and a cooling core connecting the tanks (77, 78). (79) is a radiator for a vehicle in which a radiator (72) is disposed to face the cooling fan (71).
The upper part of the upper tank (77) is formed to be recessed so as to avoid the pivot shaft (15) ,
A front end of the radiator (72) is disposed in front of the pivot shaft (15), and a portion of the radiator (72) in front of the pivot shaft (15) is disposed in the engine block (32). A radiator device for a vehicle, wherein an inlet / outlet for cooling water circulating through the water jacket (82) is arranged . The radiator (72) is disposed so as to be inclined rearwardly with respect to the axis (L) of the cylinder bore (41), and an exhaust pipe (90) connected to the exhaust port of the engine block (32) is connected to the radiator (72). The radiator device for a vehicle according to claim 1, wherein the vehicle radiator device is routed rearward and rearward of the rear portion. A water supply pipe (87) extending upward so that a water supply cap (88) is attached to the upper end is integrally provided at the rear end of the upper tank (77), and one end is connected to the engine body (25). The other end of the cooling water conduit (92) is connected to the front portion of the upper tank (77) at a position sandwiching the pivot shaft (15) between the cooling water conduit (92) and the water supply pipe (87). The vehicle radiator device according to claim 2 . The pivot shaft (15) is disposed below the upper end of the water supply cap (88) in a side view, and a radiator cover (74) made of synthetic resin is provided below the water supply cap (88) and the lower tank (78). The vehicle radiator device according to claim 3 , wherein the vehicle radiator device is covered .

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