JPH0138171B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cooling water passage device used in a water-cooled multi-cylinder engine such as a motorcycle.

(Conventional technology) Water-cooled multi-cylinder engines such as motorcycles are cooled by pumping the cooling water from the radiator with a water pump.
It is supplied to each of the plurality of cylinders via piping.

Conventionally, in such a cooling water passage device, a plurality of branch water passages are provided by branching a pipe downstream of a water pump, and each branch water passage is connected to each cylinder. For example, V
In the cooling water passage device used in type engines, as described in Japanese Patent Application Laid-Open No. 55-69719,
A water pump 21 is provided in front of the crankcase 9, distribution pipes 25 and 27 are provided between the banks 10 and 11, and an outlet 23 of the cooling water in the banks 10 and 11 is provided.
and an inlet 22 are formed on the inner surfaces of the banks 10, 11, and the outlet 23 is communicated with the radiator 29 through a pipe 31 and a distribution pipe 27, and the inlet 22 is communicated with the water pump 21 through a distribution pipe 25 and a pipe 26.

(Problem to be solved by the invention) However, the above-mentioned Japanese Patent Application Laid-Open No. 55-69719
In the cooling water passage device of the publication, a plurality of distribution pipes 25 are directly branched from the pipe 26 in correspondence with each cylinder, and the water pump 21 discharges water to these pipes via the pipe 26 and the distribution pipe 25. Since the cooling water is guided into the banks 10 and 11, there is a problem in that it is difficult to match the flow rates in each distribution path, and a temperature difference tends to occur between the banks 10 and 11. In addition, it is thought that such problems can be solved by connecting multiple pipes directly to the discharge port of the water pump, but this requires a large number of long pipes, which increases the weight and also reduces the freedom in terms of layout. A new problem arises in that it is also restricted.

Furthermore, in the above-mentioned cooling water passage device, since the water pump 21 is arranged in front of the engine crankcase and close to the front wheels, there is a large possibility that pebbles etc. thrown up by the front wheels will collide with the water pump 21. A cover or the like to protect the water pump 21 is indispensable, resulting in problems such as increased weight and increased manufacturing costs.

The present invention has been made in view of the above problems, and provides a cooling water passage device that can match the amount of cooling water distributed to distribution pipes without increasing weight or manufacturing cost. The purpose is to make the temperature uniform.

(Means for Solving the Problems) A cooling water passage device for a motorcycle or the like according to the present invention is provided in a motorcycle or the like in which a water-cooled V-type multi-cylinder engine is mounted on a tower with banks positioned in the longitudinal direction of the vehicle body. A water pump for pumping cooling water from the radiator is disposed on the side of the engine crankcase, a main pipe is led out from the water pump, and the downstream part of the main pipe is connected to the cooling water chamber, and the bank The gist is to provide separate branch piping for each cylinder on the side of the cooling water chamber and to connect the cooling water chamber and the water passage of each cylinder through the branch piping.

(Function) According to the cooling water passage device for a motorcycle, etc. of the present invention, the main pipe led out from the discharge port of the water pump is connected to the branch pipe via the cooling water chamber, and the cooling water is guided to the water passage of each cylinder. Therefore, the amount of cooling water can be equalized by setting the opening position of the branch pipe, etc., and temperature differences between the cylinders can be prevented. In addition, since the water pump is placed on the side of the crankcase, it can be separated from the front wheels by a large distance, reducing the risk of pebbles thrown up by the front wheels colliding with the water pump, simplifying protective members such as covers, and reducing manufacturing costs. It is possible to reduce the weight as well as reduce the

In addition, in this cooling water passage device, since the branch piping is placed on the side of the bank, the wind from the vehicle can be applied to the branch piping while driving, removing heat from the branch piping, thereby improving cooling efficiency. can be improved.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a left side view of the motorcycle 1, and FIG. 2 is a right side view thereof.

A head tube 3 is provided at the front end of a frame 2 of the motorcycle 1, which supports a front fork 4 supporting a front wheel 5 in a freely steerable manner, and a handle 7 is provided on a top bridge 6. The frame 2 includes a main pipe 2a extending rearward from the rear upper part of the head tube 3, a down tube 2b hanging downward from the rear lower part of the head tube 3, and a down tube blower 2 extending rearward from the lower end of the main pipe 2a.
c. A center tube 2d that is tilted forward and upward from its rear end and joined to the rear end of the main pipe 2a; a seat rail 2e that extends rearward of the main pipe 2a; and a seat rail 2e that connects this to the lower part of the center tube 2d. It consists of an oblique subtube 2f, a tension pipe 2g connecting the front part of the main pipe 2a and the upper part of the down tube 2b, etc. Thereafter, the lower 2c including the down tube 2b, the center tube 2d, etc. are provided on the left and right, and the down tube 2b has its left and right upper portions 2b' symmetrically bent in the direction of the head tube 3, as shown in the fourth figure. The middle or lower portions 2b'' are spaced apart in parallel and hang downward.

A fuel tank 8 is mounted across the main pipe 2a of the frame 2, a seat 9 is mounted on the seat rail 2e, and a rear fork 10 is pivotally extended rearward from the lower part of the center tube 2d. A rear action unit 12 is interposed between the rear fork 10 and the seat rail 2e to support the rear wheel 11.

The main pipe 2a, down tube 2b, lower tube 2c, and center tube 2d of the frame 2
An engine 13 is mounted in the space surrounded by , and in this embodiment, the engine 13 is a two-cylinder water-cooled engine with a horizontally mounted crankshaft and a narrow side V-type.
The engine 13 has a case 14 consisting of a crankcase and a transmission case, and an oil pan 1 below this.
4c, with an oil filter 14d at the rear thereof,
It consists of front and rear cylinders 15 and 16 (corresponding to banks) which are tilted up in a narrow V shape on the front half of this upper part, and the front and rear cylinders 15 and 16 are connected to cylinder blocks 15a and 16a from below, and cylinder blocks 15a and 16a above this. It consists of cylinder heads 15a, 16b and cylinder head covers 15c, 16c above.The embodiment adopts an overhead camshaft type valve control mechanism, and the front cylinder 15 has a cam chain on the left side as shown in FIG. The bar 15d is also the rear cylinder 16
The cam chain chamber 16d is arranged on the right side,
The cylinder holes 15e and 16e are provided offset in opposite directions from the vehicle body centerline. Further, a starter motor 44 is provided on one side of the case 14, on the left side in the figure, the rear part of the side cover 14b also serves as a starter gear cover 14e, and a bevel gear case 45 of a shaft drive type drive mechanism is disposed behind this part of the case. .

A radiator 1 is installed between the left and right down tubes 2b, 2b in front of the front cylinder 15 of the engine 13.
7 is disposed, and the radiator 17 is housed in the space between the down tubes, and the cross member 2 is vertically long and has its lower part horizontally suspended between the left and right down tubes.
h (see Figure 4). In the figure, 47 is an engine hanger bracket. A fan cover 18 of a forced cooling fan 48 is protruded from the rear surface of the lower part of the radiator 17. It utilizes the dead space of This makes it possible to rationally arrange the radiator by utilizing the space in front of the engine between the down tubes. Reference numeral 19 in the drawings indicates a fuel supply device that supplies fuel to each cylinder.

A water pump 20 is provided on one side of the case 14, for example, at the lower left side, and its suction side pipe section 20a and the outlet side pipe section 17a at the lower end of the radiator 17 are connected through a communication pipe 21. Discharge side pipe section 20 of water pump 20
b is connected to the upstream end of the main pipe 23 of the piping unit 22 with a communication pipe 28 made of rubber or the like, the upstream end of the main pipe is fitted to one end of the communication pipe, the downstream end of the discharge pipe part 20b is fitted to the other end, and the band 28a, 28a, and the piping unit 22 is as shown in detail in FIG. The downstream end of the large-diameter main pipe 23 is connected to the central part of one side 24a of a pipe-shaped intermediate pipe 24 disposed perpendicularly to the axis thereof and closed at both ends, thereby forming a chamber 25 inside. , the other side 24 of the intermediate portion 24
Since there are two cylinders in the example, there are sub pipes (branch pipes) 2 on the left and right sides of b, which have a smaller diameter than the two main pipes corresponding to each cylinder.
The upstream ends 26a and 27a of 6 and 27 are connected for communication.

The main pipe 23 and auxiliary pipes 26 and 27 are made of two overlapping pieces 29 wrapped around the pipe circumference in a loop shape as shown in Fig. 8.
a, 29a are supported by a band 29 connected to the starter gear cover 14e of the engine with bolts 46, and in the embodiment, as shown in the third figure, the main pipe 23 and the sub pipe 27 are connected to the side cover on this side of the case 14 by the band 29. Bolt 46 for connecting 14b to case 14
They are commonly tied together.

In the embodiment, the main pipe 23 passes under the side cover 14b and extends obliquely upward, and one of the sub pipes 27 is bent forward and extended from the intermediate pipe 24 forming the chamber 25, and the downstream part 27b is extended diagonally upward. Bend inward to open the lower through hole 16 of the rear cylinder block 16a.
f, and is communicatively connected to a water passage (not shown) of the rear cylinder 16. The intermediate pipe 24 forming the chamber 25 is arranged in a valley between the starter gear cover 14e and the bevel gear case 45. The other auxiliary pipe 26 extends inside the vehicle body, and the connecting pipe 3 is made of rubber or the like.
0 to the upstream end 31a of the secondary auxiliary pipe 31, the secondary auxiliary pipe 31 extends outward in the vehicle width, bends forward 31b, and extends forward through the opposite side of the rear cylinder 16. The downstream end 31c is connected to the lower passage hole 15f of the front cylinder block 15a, and is connected to the water passage (not shown) of the front cylinder 15. It is supported. The connecting pipe 30 has a band 30a,
At 30a, the ends of the sub pipes 26 and 31 fitted to both ends of this are tied tightly, and since the connecting pipe is made of rubber, the sub pipe 2
It absorbs the deflection when 6, 31 is fixed to the case.

Cooling water outlet pipes 32 and 33 are provided upwardly from each cylinder head 15b and 16b, and are connected to the pipe body 3.
4, 35 to the left and right inlet pipe portions 36a, 3 of the thermostat 36 provided above and behind the radiator 17.
6b, the thermostat 36 is connected to the introduction pipe part 17b protruding from the upper rear part of the radiator 17 through a communication pipe 37, and is connected to the new filler cap 38 disposed on the opposite side of the radiator 17 from the thermostat 36, that is, on the right side. The cooling water introduction pipe 39 joins and communicates with the above-mentioned communication pipe 37, thereby forming a cooling water circulation system. In this way, the thermostat and filler cap were assembled as a unit above the radiator.

By the way, the exhaust pipes 40 of each cylinder 15, 16,
Reference numeral 41 is as shown in FIG. 6, and the exhaust pipe 40 of the front cylinder 15 extends outward from the rear of one down tube 2b, that is, the right down tube, to the upstream portion 40.
a is led out, bent rearward 40b and extended rearward, and guided to the exhaust gas collection chamber 42, thereby forming a space in front of the front cylinder 15, allowing a radiator to be placed between the head tubes. The exhaust pipe 41 of the rear cylinder 16 is bent outward, extended forward, further bent downward and rearward, and led to the collection chamber 42. From the exhaust collection chamber 42, the left and right mufflers 4 are connected.
3,43, the exhaust gas is guided.

Next, to explain the operation and effect in detail, FIGS. 9 to 11 are explanatory diagrams of the operation. Cooling water discharged from the water pump 20 is supplied to the main pipe 23, and the chamber 2
5. The left and right auxiliary pipes 26,
For example, if the distances a and b from the center of the main pipe 23 to the centers of the sub pipes 26 and 27 are equal, the flow rate to each sub pipe 26 and 27 will be equal. This is shown in FIG.

If the distance a from the center of the main pipe 23 to one of the sub pipes 26 is longer than the distance b of the other sub pipe 27 as shown in FIG. In the reverse case as shown in FIG. 11, the flow rate is reversed.

By setting the positions of the main pipe 23 and the auxiliary pipes 26 and 27 connected to the chamber 25 in this way, it is possible to supply cooling water evenly to the front and rear cylinders and maintain the temperature of each cylinder constant. ,
Also, if you want to supply extra cooling water to one side, taking into account the temperature difference between the front and rear cylinders due to the influence of cooling air and the flow resistance due to piping, you can set the flow rate as described above, and the temperature difference between the cylinders can be extremely small. . Since the water pump 20 is arranged on the side of the crankcase 14 of the engine 13 and is separated from the front wheel 5, there is little risk of collision with pebbles thrown up by the front wheel 5, and the pump 20 does not require a cover. Even if a cover is provided, it can be simplified, and the manufacturing cost and weight can be reduced. moreover,
The auxiliary pipes 26 and 27 are connected to the cylinder 15 of the engine 13,
Since it is placed on the side of the vehicle 16, the wind collides with the vehicle during driving and removes heat, and it also functions as a radiator, improving cooling efficiency.

Furthermore, the other piping mentioned above is one piece up to the middle and branches into a plurality of sub-pipes through the chamber, which makes it lighter in weight and easier to manufacture and manufacture. It is sufficient to make a plurality of the following parts, bend them as desired, and guide them to the cylinder, which is advantageous in terms of space layout.

In the embodiment, the present invention is applied to a two-cylinder narrow-angle V-type engine, but the present invention can be applied to an engine with more cylinders.

(Effects of the Invention) As explained above, according to the cooling water passage device for motorcycles, etc. according to the present invention, the main pipe led out from the discharge port of the water pump is connected to the plurality of branch pipes via the cooling water chamber. Therefore, the flow rate ratio of each branch pipe can be easily adjusted according to the cooling conditions of each cylinder, and the temperature of the cylinders can be made uniform. In addition, with this cooling water passage device, the water pump is placed to the side of the engine and is far away from the front wheels, which prevents stones etc. from colliding with the water pump, simplifying the water pump's protection structure and making it lightweight. In addition, there is no need to install branch pipes in the valleys of the banks where heat radiates from each bank and the air heated by these tends to stagnate. Since it is placed in a position where it collides and also functions as a radiator, high cooling efficiency can be obtained.

[Brief explanation of drawings]

Figure 1 is a left side view of the motorcycle, Figure 2 is a right side view of the same, Figure 3 is an enlarged side view of the engine, and Figure 4 is a left side view of the motorcycle.
5 is an enlarged front view of the thermostat and filler cap section, FIG. 6 is an explanatory plan view of the engine section, FIG. 7 is a partially cutaway side view of the piping unit, and FIG. 8 is an enlarged front view of the thermostat and filler cap section. 7 Figure 8-8 line sectional view, No. 9
FIGS. 11 to 11 are explanatory views of the operation. In the drawing, 13 is an engine, 15 and 16 are cylinders (banks), 17 is a radiator, 20 is a water pump, 23 is a main pipe, 25 is a chamber, and 26 and 27 are sub pipes (branch piping).

Claims (1)

[Scope of Claims] 1. In a motorcycle or the like equipped with a water-cooled V-type multi-cylinder engine with banks located in the longitudinal direction of the vehicle body, a water pump that pumps cooling water from a radiator to the side of the engine's crankcase. A main pipe is led out from the water pump and the downstream part of the main pipe is connected to the cooling water chamber, and branch pipes are separately provided for each cylinder on the side of the bank, A cooling water passage device for a motorcycle or the like, characterized in that the branch piping connects the cooling water chamber and the water passage of each cylinder.