JPH0585448A - Construction of cooling water hose piping for water-cooled engine - Google Patents

Abstract

PURPOSE:To provide a cooling water hose piping construction for water-cooled engine excellent in appearance and capable of shortening the width of a vehicle. CONSTITUTION:In a motorcycle in which multiple exhaust pipes 15a, 15b, 15c, and 15d extended forward from cylinder heads 12 of a parallel multiple-cylinder engine are bent and extended from the underside of the engine to the rear side and a radiator 23 is provided at the upper portion of the extensions of the exhaust pipes 15a, 15b, 15c, and 15d extended from the cylinder heads 12, a cooling water hose 25 extended from the radiator 23 to an engine 10 is passed through the multiple exhaust pipes 15a, 15b, 15c, and 15d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping structure for cooling water of a water-cooled engine in a motorcycle.

[0002]

2. Description of the Related Art A motorcycle equipped with a parallel multi-cylinder water-cooled engine has a radiator arranged in front of the cylinder head of the engine, and a cooling water hose returning from the radiator is provided beside an exhaust pipe extending forward from the cylinder head. It is plumbed.

For example, in the example disclosed in Japanese Utility Model Laid-Open No. 3-49326, as shown in FIGS. 1 and 2, a radiator 03 is arranged in front of a cylinder head 02 of a water-cooled engine 01 having four parallel cylinders. The four exhaust pipes 04 extending from 02 to the front are bent downward, further curved from the front of the water-cooled engine 01 to the downward, and piped toward the rear.

A cooling water hose 05 which returns from the lower left end of the radiator 03 to the engine extends downward on the left side of the exhaust pipe 04, bends backward, and is connected to a cooling water pump 06 of the water cooling engine 01.

[0005]

[Problems to be solved] Parallel 4-cylinder water-cooled engine 01
The four exhaust pipes 04 extending from each of the cylinder heads 02 are arranged across the front of the water-cooled engine 01 to the left and right, and the cooling water hose 05 is arranged on the left side of the water cooling engine 01. Most of it is exposed and piped on the side surface, which tends to widen the vehicle body width.

Further, since the cooling water hose 05 is arranged further on the left side of the exhaust pipes 04 arranged on the left and right, the width on the left and right is widened and the width of the radiator is expanded, and in the case of a vehicle equipped with the cowl, the left and right of the cowl. Width increases and air resistance increases.

The present invention has been made in view of the above points,
The purpose is to provide a cooling water hose piping structure that has a clean appearance and can reduce the width of the vehicle body.

[0008]

In order to achieve the above object, the present invention is directed to a plurality of exhaust pipes extending forward from each cylinder head of a parallel multi-cylinder engine so as to bend backward from below and extend backward. In a motorcycle in which a radiator is arranged above the extension of the exhaust pipe from the cylinder head,
A cooling water hose piping structure for a water-cooled engine is provided in which a cooling water hose extending from the radiator and directed to the engine is piped between the plurality of exhaust pipes.

Since the cooling water hose is passed between the plurality of exhaust pipes, the appearance of the cooling water hose is small in the external appearance of the vehicle body, and the external appearance can be made clean. Further, since the cooling water hose is not provided outside the plurality of exhaust pipes, the width of the vehicle body can be shortened.

[0010]

EXAMPLE An example of the present invention shown in FIGS. 3 and 5 will be described below. FIG. 3 is a partial side view of the motorcycle 1 of the present embodiment, and FIG. 4 is a partially omitted view taken along the arrow IV in FIG.

A main frame 3 extends rearward from the head pipe 2, and a pair of center pipes 4 are branched leftward and rightward from a rear end thereof and are bent backward and extend obliquely downward.
A pair of left and right down tubes 5 extend obliquely downward from the head pipe 2, and the down tubes 5 are bent downward and extend rearward to be connected to the lower end portion of the center pipe 4 to form a vehicle body frame. There is. A front wheel 7 is pivotally supported on a lower end of a front fork 6 which is rotatably supported by the head pipe 2.

Left and right down tubes 5 of the vehicle body frame
An in-line four-cylinder engine 10 is suspended by being supported by a bracket 8 protruding from the front end and a bracket 9 provided on the downward bent portion of the center pipe 4, respectively.

The four cylinders of the engine 10 are arranged side by side so as to project obliquely upward from the crankcase 11 along the down tube 5, and are arranged side by side from the front of each cylinder head 12 thereof, respectively. 15b, 15
c and 15d extend forward.

The two exhaust pipes 15a and 15d on the left and right outer sides are located outside the pair of left and right down tubes 5 and are located at the center of two.
The exhaust pipes 15b, 15c of the book extend forward from the cylinder head 12 inside the left and right down tubes 5, pass through the down tube 5, bend downward, and obliquely move backward below the down tube 5.

During this time, the left and right outer exhaust pipes 15a, 15d approach each other inward, and the four bent exhaust pipes 15a, 15d at the lower bent portion.
b, 15c, 15d are concentrated and the two outer exhaust pipes 15a, 15d
On the two inner exhaust pipes 15b and 15c, and extends horizontally rearward, and is integrated into one exhaust flow by the integrated pipe 16, and thereafter, is guided to the rear muffler by one large-diameter exhaust pipe 17. Get burned.

On the other hand, as shown in FIG. 5, a reinforcing member 20 is interposed between the upper portions of the down tubes 5, and the reinforcing member 20 is provided.
The left and right ends of the bracket are bent forward so that the mounting portions 20a and 20b are provided in a protruding manner, and the mounting bracket 22 is mounted to the front slightly to the right of the reinforcing stay 21 installed between the left and right down tubes 5 below the reinforcing member 20. Is projected.

A radiator 23 with tanks arranged on the left and right
Cover 30 is fitted around the outer periphery of the
The upper and lower mounting portions 32a and 32b are screwed to the bracket 23b which is erected at the center of the upper end of the radiator 23 and the bracket 30a which is vertically provided to the center of the lower end of the cover 30 by the bolt 33 and the nut 34. The cooling fan 32 is attached to the rear side of the radiator 23.

In the radiator 23 having the cover 30 and the cooling fan 32 integrally attached in this way, the brackets 23c and 23d are erected on the left and right sides of the bracket 23b at the upper end thereof, and the projection 23e is projected downward slightly to the right of the lower end. Then, the protrusion 23e is fitted to the mounting bracket 22 protruding from the reinforcing stay 21 of the down tube 5 via the grommet 35, and the brackets 23c and 23 are attached to the left and right mounting portions 20a and 20b of the reinforcing member 20.
d are put together and screwed by bolts 36 and nuts 37,
The radiator 23 is arranged along the lower surface of the down tube 5.

The radiator 23 is located in front of the cylinder head 12 and has the exhaust pipes 15a, 15b, 15c and 15d.
It is located above the extending portion from, and has a horizontally long rectangular shape in a front view, and the length between the exhaust pipes 15a and 15d on the substantially outer side is the width length.

A joint pipe 24 extends from the lower end portion of the left side tank 23a of the radiator 23. The joint pipe 24 is L-shaped and bent inward, and a cooling water hose 25 is joined to the end portion thereof. Has been done.

The cooling water hose 25 is a passage for the cooling water returning to the engine, and extends horizontally inward (to the right) from the joint pipe 24 along the lower end surface of the radiator 23.
It bends obliquely downward to the rear in the center of the vehicle width direction, passes through between the two exhaust pipes 15b and 15c in the center, then bends leftward, goes above the down tube 5 on the left side, and further bends obliquely upward. It is later connected to a cooling water pump 26 located at the bottom of the engine 10.

As described above, the cooling water hose 25 is the radiator.
Since it extends from 23 and passes through between the two central exhaust pipes 15b and 15c, most of it is piped inside the down tube 5 and the appearance can be made clean.

Further, since the cooling water hose 25 is piped between the exhaust pipes 15b and 15c, the width of the vehicle body is not widened, and the radiator and the like can be narrowed to shorten the vehicle body width. .. Even when the cowl is attached, the width of the vehicle body is not expanded and the increase in air resistance can be prevented.

[0024]

The present invention has a piping structure in which a cooling water hose is passed between a plurality of exhaust pipes. Therefore, most of the cooling water hose can be hidden inside the vehicle body to make the external appearance neat. The width can be shortened.

[Brief description of drawings]

FIG. 1 is a side view of essential parts showing a conventional parallel multi-cylinder water-cooled engine and its vicinity.

FIG. 2 is a front view of the same.

FIG. 3 is a partial side view of a motorcycle according to an embodiment of the present invention.

FIG. 4 is a partly omitted view taken along arrow IV in FIG.

FIG. 5 is an exploded perspective view showing a radiator mounting structure.

[Explanation of symbols]

1 ... Motorcycle, 2 ... Head pipe, 3 ... Main frame, 4 ... Center pipe, 5 ... Down tube, 6 ... Front fork, 7 ... Front wheel, 8, 9 ... Bracket, 10 ...
Parallel 4-cylinder engine, 11 ... Crank case, 12 ... Cylinder head, 15a, 15b, 15c, 15d ... Exhaust pipe, 16 ... Integrated pipe, 17 ... Exhaust pipe, 20 ... Reinforcing member, 21 ... Reinforcing stay, 22 ...
Mounting bracket, 23 ... Radiator, 24 ... Joint pipe, 25 ... Cooling water hose, 26 ... Cooling water pump, 30 ... Cover, 31 ... Screw, 32 ... Cooling fan, 33 ... Bolt, 34 ... Nut, 35 ... Grommet, 36 … Bolts, 37… nuts.

Claims (1)

[Claims] 1. A plurality of exhaust pipes extending forward from each cylinder head of a parallel multi-cylinder engine are bent and extended rearward from below, and a radiator is disposed above an extending portion of the exhaust pipes from the cylinder head. In the motorcycle described above, a cooling water hose piping structure for a water-cooled engine, characterized in that a cooling water hose extending from the radiator and directed to the engine is piped between the plurality of exhaust pipes.