JP2001213376A - Cooling water piping layout structure for scooter type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve air bleeding property by allowing air mixed into a cooling water passage in an engine, to easily escape to a filler hole through an upper cooling water piping and a filling pipe, to shorten the upper cooling water piping compared with a conventional one to reduce machining cost on the vehicle body side for fixing the upper cooling water piping to the vehicle body side and the material cost of a fixture, a machine screw, or the like and further to improve productivity by reducing assembling man-hours for assembling the upper cooling water piping to the vehicle body side. SOLUTION: The filler hole 55 for filling cooling water into a radiator 31, and the filling pipe 54 connected to the upper part of the radiator 31 from the filler hole 55, are provided in leg shields 33, 34. The upper cooling water piping 52 is extended almost horizontally to the front of a vehicle body from the upper part of a cylinder head 43 of the engine 16 and then further extended obliquely upward, and its tip is connected to the filling pipe 54 through a relay pipe 53.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water piping arrangement for a scooter-type vehicle, which has good air bleeding properties, suppresses manufacturing costs, and enhances productivity.

[0002]

2. Description of the Related Art The structure of a cooling system of a scooter type vehicle equipped with a water-cooled engine is disclosed, for example, in Japanese Patent Application Laid-Open No. 11-31.
Japanese Patent Application Publication No. 0179, "A radiator arrangement structure of a scooter type vehicle" is known. FIG. 2 of the above publication
8 will be described again below. In addition, a code is re-assigned.

FIG. 8 is an explanatory view for explaining the structure of a cooling system in an engine of a conventional scooter type vehicle. The water pump 101 and the radiator 1 of the water-cooled engine 100 are shown in FIG.
02 and the engine 100 from the radiator 102
A supply hose 103 for supplying cooling water to each part of the engine is connected to the engine 100 and the radiator 10.
2 shows a state in which a return hose 104 for returning the cooling water circulating in the engine 100 to the radiator 102 is connected to an upper part of the engine 100. In addition, 105 is an injection pipe for injecting cooling water into the radiator 102, and 106 is a vehicle body frame.

[0004]

In the technique disclosed in the above publication,
Since the return hose 104 has a shape in which an intermediate portion is curved downward, for example, when air is mixed in the cooling water in the engine 100, the air moves in the return hose 104 to the injection pipe 105 side. And it is difficult to remove air.

[0005] Further, since the entire length of the return hose 104 is increased, the number of fixing points when the return hose 104 is fixed to the body frame 106 side increases, and the processing cost of the fixing points increases.

Further, the number of fixing brackets, screws and the like for fixing increases, and the material cost increases. Further, the number of man-hours for assembling the hose 104 to return to the vehicle body frame 106 increases, which causes a decrease in productivity.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cooling water piping arrangement for a scooter type vehicle, which has good air bleeding properties, can reduce manufacturing costs, and can improve productivity.

[0008]

In order to achieve the above object, a first aspect of the present invention provides a leg shield provided below a handle, and a floor step provided on a lower rear portion of the leg shield. In a scooter-type vehicle having a radiator provided below a front portion and a water-cooled engine disposed below a rear portion of a floor step, an inlet for injecting cooling water into the radiator and an upper portion of the radiator from the inlet in the leg shield. And an upper cooling water pipe extending substantially horizontally from the upper part of the cylinder head of the engine to the front of the vehicle body, and then further obliquely extending upward, and a tip thereof is connected to the injection pipe. .

The upper cooling water pipe extends substantially horizontally from the upper part of the cylinder head toward the front of the vehicle body and then diagonally further upward, and the tip thereof is connected to an injection pipe, so that air mixed in the cooling water passage in the engine can be removed. Easily escape to the inlet through the upper cooling water pipe and the inlet pipe. Thereby, the air bleeding property can be improved.

Further, the upper cooling water pipe can be shortened as compared with the prior art, and the number of processing parts on the vehicle body for fixing the upper cooling water pipe to the vehicle body, fixing fittings for fixing, and screws are reduced. Therefore, processing costs and material costs can be reduced. Further, the number of assembly steps for assembling the upper cooling water pipe on the vehicle body side can be reduced, and productivity can be improved.

According to a second aspect of the present invention, the upper part of the crankcase of the engine is swingably connected to the vehicle body frame, and the lower cooling water pipe connecting the lower part of the crankcase of the engine and the lower part of the radiator is spaced apart from the lower surface of the floor step. It is characterized by having done.

The lower cooling water pipe is arranged to be spaced downward from the lower surface of the floor step, so that the lower cooling water pipe is smoothly curved into a large space below the floor step. The lower cooling water pipe is located far from the swing axis of the vehicle body frame, and the swing of the upper cooling water pipe accompanying the swing of the engine becomes large. Excessive bending of the piping can be prevented. Further, since the upper cooling water pipe is located near the swing axis, the swing of the upper cooling water pipe accompanying the swing of the engine is small, and the bending of the upper cooling water pipe can be reduced.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a side view of a scooter type vehicle to which a cooling water piping arrangement according to the present invention is applied. A scooter type vehicle 10 includes a head pipe 12 at a front end of a body frame 11 extending in the front-rear direction. A front fork 13 and a front wheel 14 are mounted on the front fork 13 so as to be steerable, a handle 15 is integrally mounted on an upper portion of the front fork 13, and a power unit 18 including an engine 16 and a power transmission mechanism 17 is mounted on a rear portion of the body frame 11. A rear wheel 21 is attached to the output shaft at the rear end of the vehicle, a carburetor 23 is connected to an upper portion of the engine 16 via an intake pipe 22, and a connecting tube 24 is connected to the carburetor 23, and an air cleaner 26 is connected to the carburetor 23 via an intake chamber 25. Body frame 11 above engine 16
Luggage box 27 for storing helmets and accessories
At the top of the luggage box 27, seat 2
8 is a vehicle in which 8 is arranged.

Here, 31 is a radiator for cooling the engine 16, 32 is a battery, 33 and 34 are a front cover and a front inner cover below the handle 15 and covering the upper part of the front fork 13, and 35 is a front cover 33. And a floor step disposed behind the lower part of the front inner cover 34;
Is a lower cover that covers the lower part of the body, and 37 is a body cover.
The front cover 33 and the front inner cover 34
It constitutes a leg shield placed in front of the driver's legs.

FIG. 2 is a side view for explaining a cooling water piping arrangement structure of the scooter type vehicle according to the present invention. In FIG. 2, reference numeral 40 denotes a crankcase of the engine 16, and 41 denotes a body frame 1.
A swing axis of the power unit 18 swinging with respect to 1; 42, a cylinder block; 43, a cylinder head;
44 is a head cover, and 45 is an engine hanger for swingably attaching the power unit 18 to the swing shaft 41.

In FIG. 2, one end of an upper cooling water pipe 52 is connected to a thermostat 51 mounted on an upper part of a cylinder head 43, and a relay pipe 53 is connected to the other end of the upper cooling pipe 52. To the lower end of the injection pipe 54, and extend the injection pipe 54 upward,
An injection port 55 is provided at the upper end of the injection pipe 54, the injection port 55 is closed with a cap 56, one end of a radiator upper pipe 57 is connected to the relay pipe 53, and the other end of the radiator upper pipe 57 is connected to the upper part of the radiator 31. , And one end of a lower cooling water pipe 58 is connected to a lower part of the radiator 31, and the other end of the lower cooling water pipe 58 is connected to a water pump 61 provided at a lower part of the crankcase 40.

FIG. 3 is a plan view illustrating the arrangement of cooling water pipes of the scooter type vehicle according to the present invention. The upper cooling water pipe 52 extends from the injection pipe 54 to the thermostat 51 substantially in the front-rear direction of the vehicle body. Things. The lower cooling water pipe 58 is approximately S from the left side of the radiator 31 to a water pump 61 (see FIG. 2) mounted on the right side of the engine 16.
It is smoothly curved and extended in the shape of a letter.

FIG. 4 is a sectional view taken along the line 4-4 in FIG. 2, and for convenience of explanation, a section of the floor step 35 is shown. The floor step 35 has a reverse U-shaped tunnel section 63 in cross section.
And foot rests 64, 64 extending to both sides from the lower end of the tunnel 63, and these foot rests 64, 64, respectively.
64, and side portions 65, 65 extending downward from the end portion of the first portion 64. In addition, 66 ... is a rib provided below the foot rests 64, 64, 67 ... is a lower surface of the rib 66 ... (that is, a lower surface of the floor step 35).

The upper cooling water pipe 52 is connected to the floor step 3
The lower cooling water pipe 58 is disposed in the tunnel portion 63 of the fifth step 5 and the footrest portions 64, 6 of the floor step 35.
4 below the lower surface 67 of the rib 66 provided at the lower part of
They are arranged only apart.

FIG. 5 is a system diagram of a cooling water supply path in the cooling water piping arrangement structure of the scooter type vehicle according to the present invention. Here, 71 is a cooling water first passage, and 72 is a cooling water second passage.
A passage, 73 a cooling water third passage, 74 a cooling water fourth passage,
75 is a cooling water return passage. The cooling water third passage 7
3 is composed of the upper cooling water pipe 52, the relay pipe 53 and the radiator upper pipe 57 shown in FIG.
The passage 74 is constituted by the lower cooling water pipe 58 shown in FIG.

In FIG. 5, when the engine 16 is operated, the water pump 61 is operated accordingly, and the cooling water flows through the first cooling water passage 71 to the cylinder block 42.
After flowing into the inside and the cylinder head 43 and cooling each part, the thermostat 51 passes through the cooling water second passage 72.
Leads to.

Here, if the temperature of the cooling water exceeds a predetermined temperature, the valve in the thermostat 51 opens, and the cooling water flows from the thermostat 51 to the radiator 31 through the third cooling water passage 73, and the radiator 31 Dissipates heat while passing through. The cooling water cooled by the radiator 31 returns to the water pump 61 through the fourth cooling water passage 74.

If the temperature of the cooling water reaching the thermostat 51 is lower than a predetermined temperature, the valve in the thermostat 51 does not open, and the cooling water flows from the thermostat 51 through the cooling water return passage 75 to the water pump. Return to 61.

FIG. 6 is a side view of the engine of the scooter type vehicle according to the present invention, and is a view of the side opposite to the engine 16 shown in FIG. The engine 16 has a thermostat 51 mounted on the upper side of the cylinder head 43 and a water pump 61 provided on the lower side of the crankcase 40.

Here, 42a is a cooling water suction port of the cylinder block 42, 51a, 51b, 51c are cooling water suction ports, cooling water discharge ports and cooling water return side discharge ports of the thermostat 51, and 61a, 61b, 61c are water. Pump 61
Cooling water discharge port, cooling water suction port and cooling water return port, 77
Is a secondary air control valve.

Cooling water inlet 42 of cylinder block 42
a is the water pump 61 via the cooling water first passage 71.
Of the cooling water discharge port 61a. The cooling water discharge port 51b of the thermostat 51 is connected to the upper cooling water pipe 5
2 (see FIG. 2).

The cooling water return side discharge port 51c of the thermostat 51 communicates with the cooling water return port 61c of the water pump 61 via a cooling water return passage 75. The cooling water suction port 61b of the water pump 61 is connected to one end of the lower cooling water pipe 58 shown in FIG.

FIG. 7 is a view taken in the direction of arrow 7 in FIG.
6, the cylinder block 42, the cylinder head 43, and the head cover 44 are attached to the crankcase 40, and the side surface 40a of the crankcase 40 and the respective side surfaces 4 of the cylinder block 42, the cylinder head 43, and the head cover 44.
The thermostat 51 is arranged in a space S1 facing the 2c, 43c and 44c. Here, 43b is a cooling water discharge port of the cylinder head 43, and 81 is a spark plug.

As described above, according to the present invention, the leg shields 33 and 34 are provided below the handle 15 shown in FIG. 1, and the floor step 35 for placing a foot on the lower rear of the leg shields 33 and 34 is provided. In the scooter type vehicle 10 in which the radiator 31 is provided below the front portion of the floor step 35 and the water-cooled engine 16 is provided below the rear portion of the floor step 35, the radiator 31 is cooled in the leg shields 33 and 34 in FIG. An inlet 55 for injecting water and the radiator 3 from the inlet 55
1. An injection pipe 54 connected to the upper part is provided, and the upper cooling water pipe 52 extends substantially horizontally from the upper part of the cylinder head 43 of the engine 16 to the front of the vehicle body and then diagonally further upwards. It is characterized in that it is connected to the injection pipe 54.

The upper cooling water pipe 52 is connected to the cylinder head 43
By extending substantially horizontally from the upper part to the front of the vehicle body and then diagonally further upward and connecting the tip to the injection pipe 54,
When the cooling water flows from the engine 16 side to the radiator 31 side in the upper cooling water pipe 52, air mixed in the cooling water passage in the engine 16 is removed by the upper cooling water pipe 52 and the relay pipe 5.
The air can be easily released to the injection port 55 via the injection pipe 3 and the injection pipe 54, and the air bleeding property can be improved.

Further, as compared with the prior art, the upper cooling water pipe 52
Can be shortened, the number of processing parts on the side of the vehicle body frame 11 for fixing the upper cooling water pipe 52 to the side of the vehicle body frame 11 and the number of fixing brackets and screws for fixing can be reduced. Can be reduced.
Further, the number of steps for assembling the upper cooling water pipe 52 to the body frame 11 can be reduced, and the scooter type vehicle 10 (FIG.
) Can be improved.

In the present invention, the upper part of the crankcase 40 of the engine 16 is swingably connected to the body frame 11, and the lower cooling water pipe 58 connecting the lower part of the crankcase 40 of the engine 16 and the lower part of the radiator 31 is provided with a floor step. It is characterized in that it is arranged to be spaced downward from the lower surface 67 of the 35 (see FIG. 4).

The lower cooling water pipe 58 is connected to the floor step 35.
Of the lower cooling water pipe 5 in a large space below the floor step 35 because the lower cooling water pipe 5
8 can be smoothly curved and arranged.

The lower cooling water pipe 58 is connected to the body frame 11.
And the swing of the lower cooling water pipe 58 accompanying the swing of the engine 16 increases, however, due to the arrangement of the lower cooling water pipe 58 described above,
Excessive bending of the lower cooling water pipe 58 due to the swing of the engine 16 can be prevented. Therefore, the life of the lower cooling water pipe 58 can be extended.

The upper cooling water pipe 52 is connected to the swing shaft 4.
1, the swing of the upper cooling water pipe 52 accompanying the swing of the engine 16 is small, and the bending of the upper cooling water pipe 52 can be reduced. Therefore, like the lower cooling water pipe 58, the life of the upper cooling water pipe 52 can be extended.

[0036]

According to the present invention, the following effects are exhibited by the above configuration. The cooling water piping arrangement structure for a scooter-type vehicle according to claim 1, further comprising an injection port for injecting cooling water into the radiator and an injection pipe connected from the injection port to an upper portion of the radiator in the leg shield, and a cylinder head of the engine. The upper cooling water pipe extends from the upper part almost horizontally to the front of the vehicle body and then diagonally further upward, and its tip is connected to the injection pipe, so that the air mixed into the cooling water passage in the engine is injected into the upper cooling water pipe and injected. Can be easily escaped to the inlet via a tube. Thereby, the air bleeding property can be improved.

Further, the upper cooling water pipe can be made shorter than before, and the number of processing parts on the vehicle body side for fixing the upper cooling water pipe to the vehicle body side, fixing fittings for fixing, and screws are reduced. Therefore, processing costs and material costs can be reduced. Further, the number of assembly steps for assembling the upper cooling water pipe on the vehicle body side can be reduced, and productivity can be improved.

According to a second aspect of the present invention, there is provided a cooling water piping arrangement for a scooter type vehicle, wherein an upper portion of a crankcase of an engine is swingably connected to a vehicle body frame, and a lower cooling water piping for connecting a lower portion of the crankcase of the engine and a lower portion of the radiator is provided. The lower cooling water pipe can be smoothly curved and disposed in a large space below the floor step because the lower cooling water pipe is arranged downward from the lower surface of the floor step.

The lower cooling water pipe is located far from the swing axis of the vehicle body frame, and the swing of the upper cooling water pipe accompanying the swing of the engine becomes large. Excessive bending of the associated lower cooling water pipe can be prevented.
Therefore, the life of the lower cooling water pipe can be extended.

Further, since the upper cooling water pipe is located near the swing axis, the swing of the upper cooling water pipe accompanying the swing of the engine is small, and the bending of the upper cooling water pipe can be reduced. Therefore, like the lower cooling water pipe, the life of the upper cooling water pipe can be extended.

[Brief description of the drawings]

FIG. 1 is a side view of a scooter type vehicle to which a cooling water piping arrangement according to the present invention is applied.

FIG. 2 is a side view illustrating a cooling water piping arrangement structure of the scooter type vehicle according to the present invention.

FIG. 3 is a plan view illustrating a cooling water piping arrangement structure of the scooter type vehicle according to the present invention.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 2;

FIG. 5 is a system diagram of a cooling water supply path in the cooling water piping arrangement structure of the scooter type vehicle according to the present invention.

FIG. 6 is a side view of the engine of the scooter type vehicle according to the present invention.

7 is a view taken in the direction of arrow 7 in FIG. 6;

FIG. 8 is an explanatory diagram illustrating a structure of a cooling system in an engine of a conventional scooter type vehicle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Scooter type vehicle, 11 ... Body frame, 15 ... Handle, 16 ... Engine, 31 ... Radiator, 33, 3
4: Leg shield (front cover, front inner cover), 35: floor step, 40: crankcase, 43: cylinder head, 52: upper cooling water pipe, 5
4 ... injection pipe, 55 ... injection port, 58 ... lower cooling water pipe, 6
7: The lower surface of the floor step.

Claims (2)

[Claims] 1. A leg shield is provided below a handle, a floor step is provided below the leg shield, and a radiator is provided below a front portion of the floor step, and a water-cooled type is provided below a rear portion of the floor step. In a scooter type vehicle in which an engine is arranged, an injection port for injecting cooling water into the radiator and an injection pipe connected from the injection port to an upper portion of the radiator are provided in the leg shield, and an upper portion is provided from an upper portion of a cylinder head of the engine to an upper portion. A cooling water pipe arrangement structure for a scooter type vehicle, wherein a cooling water pipe extends substantially horizontally forward of the vehicle body, and then further extends obliquely upward, and a leading end thereof is connected to the injection pipe. 2. An engine crankcase upper part is swingably connected to a vehicle body frame, and a lower cooling water pipe connecting a lower part of the engine crankcase and a lower part of the radiator is spaced apart from a lower surface of the floor step. The cooling water piping arrangement structure for a scooter type vehicle according to claim 1, wherein: