JPH1016853A - Motorcycle engine cooling system - Google Patents

Abstract

(57) [Problem] To uniformly control the temperature of each part of a motorcycle engine by reasonably cooling a multiple cylinder forming part forming four or more cylinders with cooling water. A multiple cylinder forming part (4) is provided on a cylinder block (43) of a motorcycle engine (E) which stands upright or leans forward.
5 and an inlet 37 opening toward the center in the left-right direction of the multiple cylinder forming portion 43.
i, and the cylinder head 48 has an upper water jacket 37A communicating with the lower water jacket 37B,
An outlet 37o located immediately above the inlet 37i is formed, and the cooling water discharged from the water pump 34 is applied to the center of the multiple cylinder forming portion 43 from the inlet 37i, and then the lower and upper water jackets 37B and 37A are connected. It was made to flow symmetrically to the outlet 37o.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple cylinder forming section for mounting an engine and a radiator on a vehicle body frame, and forming four or more cylinders in parallel on an upright or forward inclined cylinder block of the engine. A lower water jacket surrounding it is formed, and an upper water jacket communicating with the lower water jacket is formed on the cylinder head joined to the upper surface of the cylinder block. The motorcycle is connected to the inlet of the lower water jacket via the outlet, the outlet of the upper water jacket to the radiator via the outlet pipe, and the suction part of the water pump to the radiator via the return pipe, respectively. The present invention relates to an improvement in an engine cooling device including a water jacket, a water pump, and a radiator.

[0002]

2. Description of the Related Art Conventionally, in such an engine cooling device for a motorcycle, the inlet and outlet of a water jacket of the engine are arranged to be largely offset from each other in the left-right direction of the engine (for example, Japanese Patent Application Laid-Open No. 61-75018). Gazette).

[0003]

In the above-mentioned conventional apparatus, the amount of water acting on the central portion of the multiple cylinder forming portion where the cooling water does not flow symmetrically in the water jacket of the engine and does not easily dissipate heat. Is not sufficient, it may be difficult to control the temperature of each part uniformly.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has been made in view of the above circumstances. It is an object of the present invention to provide a motorcycle engine cooling device.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an engine and a radiator mounted on a body frame, and four or more parallel cylinders are mounted on an upright or forward inclined cylinder block of the engine. A multiple cylinder forming part that forms a cylinder and a lower water jacket surrounding it are formed, and an upper water jacket that communicates with the lower water jacket is formed on the cylinder head that is joined to the upper surface of the cylinder block. The outlet of the water pump is connected to the inlet of the lower water jacket via the inlet pipe, the outlet of the upper water jacket is connected to the radiator via the outlet pipe, and the suction of the water pump is connected to the radiator via the return pipe. In each connected motorcycle, one side wall of the lower water jacket opens toward the center in the left-right direction of the multiple cylinder forming part. Said inlet and is provided, also on the side wall of the upper water jacket, a first feature in that a said outlet occupying a position directly above the inlet that.

According to a second feature of the present invention, in addition to the first feature, the inlet is provided on a rear wall of the cylinder block, and the inlet pipe connected to the inlet is provided on a rear surface of the cylinder block. .

Further, in addition to the second feature, the present invention has a third feature that a bypass pipe is provided on the back surface of the cylinder block so as to communicate between the outlet and the suction part of the water pump. .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments of the present invention shown in the accompanying drawings. still,
In the description, front and rear, left and right refer to a vehicle.

FIG. 1 is a side view of a motorcycle, FIG. 2 is a plan view thereof, FIG. 3 is a front view thereof, FIG.
FIG. 5 is a side view of the vaporizer section. First, in FIGS. 1 to 3, a vehicle body frame F includes a head pipe 1, a pair of left and right main frames 2 extending rearward and downward while being separated from the head pipe 1, and connected to the rear ends of the main frames 2. And a pair of left and right center frames 3 extending downward and a seat stay 4 connected to the upper portion of the center frames 3 and extending rearward and slightly upward, and a front fork for supporting the front wheel Wf on the head pipe 1. A rear fork 6 supporting the rear wheel Wr is pivotally supported on the left and right center frames 3 so as to be vertically swingable.

Upright or forward-tilting cylinder block 43
The engine E having the head frame inserted between the left and right main frames 2 immediately before the center frame 3 is disposed.
Bolted. The power of the engine E is transmitted to the rear wheels Wr via a transmission incorporated in the engine E and a chain transmission 7.

A fuel tank 8 is mounted on the left and right main frames 2, and a tandem seat 9 is mounted on the seat stay 4.

4 and 5, a multiple carburetor 10 is mounted on the back of the head of the engine E, and an air cleaner 11 for opening an intake passage inlet of the carburetor 10 is covered by a fuel tank 8. It is arranged between the two main frames 2 and is rubber-mounted at several places on the head of the engine E. As shown in FIG.
Is composed of an upper case 12a and a lower case 12b joined to each other by screws 26, and a large-volume main cleaner chamber 27 and a small-volume auxiliary cleaner chamber 28 are provided between the upper and lower cases 12a and 12b. Is defined. The main cleaner chamber 27 houses a known air cleaner element (not shown) for purifying the intake air of the engine E.

In the auxiliary cleaner chamber 28, the air filter 2 sandwiched between the joining surfaces of the upper and lower cases 12a and 12b is provided.
9, the auxiliary cleaner chamber 28 is divided into upper and lower two chambers 28a and 28b. At the bottom wall of the lower case 12b, an air introduction hole 30 communicating with the lower chamber 28b is provided, and a communication pipe 31 penetrating the bottom wall is integrally formed. The upper end of the communication pipe 31 is an air filter. 29 is opened to the upper chamber 28a, and the lower end thereof is provided with the multiple vaporizer 1 of a constant vacuum variable venturi type.
The air conduit 22 connected to the zero air chamber is connected. Since the auxiliary cleaner chamber 28 is not affected by the pressure fluctuation of the main cleaner chamber 27, the air inlet 30 and the air filter 2 are not affected.
Through 9, a stable and clean atmosphere can be introduced into the atmosphere chamber of the vaporizer 10.

A plurality of exhaust pipes 13 connected to the front surface of the head portion of the engine E are piped directly below the engine E and are divided into two sets on the left and right sides. It is connected to a pair of exhaust mufflers 14.

In FIG. 4, a radiator 15 is disposed facing the front of the head of the engine E. The radiator 15 has an upper part on the main frame 2 and a lower part via a stay 16.
Respectively supported. An electric radiator fan 17 has a fan cover 18 behind the radiator 15.
Is attached to the radiator 15 via the.

Referring again to FIG. 1 to FIG. 3, the engine E and the radiator 15
Is attached to the vehicle body frame F and the engine E. A headlight 20 is attached to the front wall of the cowling C so that its lens surface is continuous with the outer surface of the front wall.
Of the main cooling air intake hole 2 opening toward the radiator 15 and the engine E.
2 are provided. On the left and right side walls of the cowling C, a first sub-cooling air inlet 23 opening toward the head portion of the engine E and a second sub-cooling air inlet 24 opening toward the exhaust pipe 13 are provided. The rear surface of cowling C is open. Therefore, the cooling air inlets 22, 23, 2
The running wind that flows into cowling C from 4 is radiator 1
After cooling the engine 5 and / or the engine E, it flows out behind the cowling C.

FIG. 6 is a longitudinal sectional side view of a main part of the engine E, and FIG.
8 is a sectional view taken along line 7-7 and 8-8 in FIG. 6, and FIG. 9 is a diagram of a cooling water passage. The cooling device of the engine E will be described below with reference to FIGS.

First, the configuration of the cooling water passage will be described with reference to FIG. 9. The engine E is provided with a water pump 34 driven by an appropriate rotating part. The suction part of the water pump 34 is connected to a water outlet of the radiator 15 via a return pipe 35, and the discharge part of the water pump 34 is connected to an inlet 37i of a water jacket 37 of the engine E via an inlet pipe 36. . An outlet 37o of the water jacket 37 is connected to a water pump 34 via a bypass pipe 39 provided with a throttle 38 on one side.
Of the radiator 15 through the thermo valve 40 and the outlet pipe 41 in that order. The thermo valve 40 is a known open / close type, and is opened when the water temperature near the outlet 37o of the water jacket 37 of the engine E reaches a predetermined high temperature (for example, 71 ° C. or higher).

As shown in FIG. 4, the water pump 34 is mounted on the lower left wall of the engine E, the return pipe 35 is piped on the left side of the engine E, and the inlet pipe 36 and the bypass pipe 39 are connected to the engine E. The outlet pipe 41 is provided on the right side of the engine E.

As shown in FIGS. 6 to 8, the engine E
A cylinder block 43 includes a four cylinder sleeves 44 _{1-44 4} 4 consecutive cylinder forming portion 45 enveloping casting a arranged in the lateral direction, and the lower water jacket 37B which surrounds the upper half of the quadruplicate cylinder forming portion 45 The cylinder head 48 joined to the upper surface of the cylinder block 43 via a gasket 47 has an upper water jacket 37A surrounding the intake port 49 and the exhaust port 50, and an upper and lower water jacket 37A. , 37B are communicated via a number of communication holes 51 formed in the bottom of the gasket 47 and the cylinder head 48, and the water jacket 37 is constituted by these.

In FIG. 7, the rear wall of the lower water jacket 37B is provided with the inlet 37i opening toward the center in the left-right direction of the four-cylinder forming section 45, and an inlet connection block communicating with the inlet 37i. 52 is fixedly connected to the downstream end of the inlet pipe 36.

In FIG. 8, the upper water jacket 37
On the rear wall of A, the outlet 37o located immediately above the inlet 37i is provided, and a thermo-valve case 53 communicating with the outlet 37o is fixed. The thermo-valve case 53 has a case main body 53a directly communicating with the outlet 37o.
And a case cover 53b joined to an outer end surface of the case main body 53a with a partition plate 54 interposed therebetween, and the thermo valve 40 is attached to the partition plate 54. A first outlet connection pipe 38 also serving as the throttle is provided in the case main body 53a.
A second outlet connection pipe 55 is formed in the case cover 53b. The upstream end of the bypass pipe 39 is provided in the first outlet connection pipe 38, and the outlet pipe 41 is provided in the second outlet connection pipe 55. The downstream ends are respectively connected. Therefore, the bypass pipe 39 always communicates with the outlet 37o of the upper water jacket 37A regardless of whether the thermo valve 40 is opened or closed, but the outlet pipe 41 communicates with the outlet 37 o only when the thermo valve 40 is opened. It has become.

Next, the operation of this embodiment will be described. At the time of low temperature operation of the engine E with the thermo valve 40 closed, as shown in FIG. 9, the water pump 34 → the inlet pipe 36 → the water jacket 37 (the lower water jacket 37B → the upper water jacket 37A) → the throttle 38 → the bypass pipe 39 → the first path L ₁ of the water pump 34 the cooling water circulates. Therefore,
Since the cooling water is not exchanged between the engine E and the radiator 15, and the cooling water heated in the high temperature part of the engine E circulates through the entire water jacket of the engine E, each part of the engine E is uniformly and short. The temperature rises over time, and the warm-up can be effectively promoted.

[0024] temperature of the water jacket 37 is thermo-valve 40 is opened beyond the opening temperature of the thermo-valve 40, the cooling water in addition to the first path L _1, the water pump 34 → inlet pipe 36 → the water jackets 37 (The lower water jacket 37B → the upper water jacket 37A) → the thermo valve 40 → the outlet pipe 41 → the radiator 15 → the second path L ₂ of the water pump 34 is circulated. However,
For the first path L of 38 stop in ₁ is interposed found the following second circulation water path L ₂ larger than the first circulation water path L _1. Therefore, a large amount of cooling water is exchanged between the engine E and the radiator 15, and an excessive temperature rise of the cooling water is suppressed.

In such an engine cooling device, the inlet 37i of the lower water jacket 37B is open toward the center in the left-right direction of the quadruple cylinder forming portion 45, so that the cooling water flowing from the inlet pipe 36 to the inlet 37i. The water first hits the central part of the four-cylinder forming part 45, which is particularly difficult to dissipate heat, and cools it.
Spread over the entire area B, and the entire four-cylinder forming section 45 is cooled.

The cooling water circulated through the lower water jacket 37B is transferred to the upper water jacket 37A through a large number of communication holes 51, and cools each part of the cylinder head 48.
From 7o, it flows out to the bypass pipe 39 and the outlet pipe 41 through the thermo valve case 53. At this time, the outlet 37o also occupies the center in the left-right direction of the water jacket 37 similarly to the inlet 37i.
The state of the flow of the cooling water at 7B and 37A is substantially symmetrical.

As described above, the cooling water that has flowed into the lower water jacket 37B first cools the central portion of the four-cylinder forming portion 45 in a concentrated manner, and then the lower and upper water jackets 3B.
By flowing through the 7B and 37A substantially symmetrically, the four-cylinder forming body 45 having different heat radiation properties can be cooled down rationally, and the temperature of each part can be controlled substantially uniformly.
In addition, since the thermo valve case 53, which is a relatively large protrusion on the outer surface of the engine E, is installed utilizing the dead space behind the cylinder head 48, it is necessary to avoid interference with the body frame F and other parts. Can be.

The inlet connection block 52 is attached to the back of the cylinder block 43, and the inlet pipe 36 is piped to the back of the cylinder block 43.
The thermo valve case 53 is attached to the back of the
Pipes on the back of the cylinder head 48 and the cylinder block 43, the pipes of the inlet pipe 36 and the bypass pipe 39 are connected to the cylinder block 43 and the cylinder head 48.
The dead space behind is effectively used, and interference with other parts can be avoided. That is, by piping the inlet pipe 36 and the bypass pipe 39 on the side surface of the engine E, the cowling C is swelled to the left and right and outwards, thereby preventing the bank angle of the motorcycle from being reduced.

The present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the gist of the present invention. For example, the throttle 38 can be provided on the downstream side of the bypass pipe 39, and the bypass pipe 39 itself can be reduced in place of the throttle 38. Further, the present invention is applicable not only to a multi-cylinder engine other than a four-cylinder engine but also to a single-cylinder engine.

[0030]

As described above, according to the first aspect of the present invention, an engine and a radiator are mounted on a body frame,
An upright or forward-inclined cylinder block of this engine forms a multiple cylinder forming section forming four or more cylinders in parallel and a lower water jacket surrounding the cylinder forming section, and a cylinder joined to the upper surface of the cylinder block An upper water jacket communicating with the lower water jacket is formed in the head, the discharge part of the water pump mounted on the engine is connected to the inlet of the lower water jacket via the inlet pipe, and the outlet of the upper water jacket is connected to the outlet pipe. In the motorcycle in which the suction part of the water pump is connected to the radiator via the return pipe via a return pipe, the side wall of the lower water jacket opens toward the center in the left-right direction of the multiple cylinder forming part. An inlet is provided, and the outlet occupying a position immediately above the inlet is provided on one side wall of the upper water jacket, so that the lower water jacket is provided. The cooling water flows intensively toward the central part of the multiple cylinder forming part at the bottom, and then the cooling water flows symmetrically to the lower and upper water jackets. Can be cooled down rationally and the temperature of each part can be controlled uniformly.

According to a second feature of the present invention, the inlet is provided on the rear wall of the cylinder block, and the inlet pipe connected thereto is provided on the rear surface of the cylinder block. The dead space behind can be used, and interference between the inlet pipe and other parts can be easily avoided.

According to a third feature of the present invention, a bypass pipe is provided at the back of the cylinder block so as to communicate between the outlet and the suction part of the water pump.
The dead space behind the cylinder block can be used for the piping of the bypass pipe, and interference between the bypass pipe and other parts can be easily avoided.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle.

FIG. 2 is a plan view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is a side view of the engine part of the motorcycle.

FIG. 5 is a partial longitudinal side view of a carburetor part of the motorcycle.

FIG. 6 is a longitudinal sectional side view of a main part of the engine.

FIG. 7 is a sectional view taken along line 7-7 of FIG. 6;

8 is a sectional view taken along line 8-8 in FIG. 6;

FIG. 9 is a cooling water passage diagram of the engine cooling device.

[Explanation of symbols]

E Engine F Body frame 15 Radiator 34 Water pump 35 Return pipe 36 Inlet pipe 37 Water jacket 37i Inlet 37o Outlet 37A Upper water jacket 37B Lower water jacket 39 Bypass pipe 41 Outlet pipe 43 Cylinder block 44 _{1 to} 44 ₄ Cylinder sleeve as cylinder 45 Quadruple cylinder forming section as multiple cylinder forming section 48 Cylinder head 51 Communication hole

Claims (3)

[Claims] An engine (E) and a radiator (15) are mounted on a body frame (F), and four or more cylinders are arranged in parallel on an upright or forward-inclined cylinder block (43) of the engine (E). (44 _{1 to} 44 ₄ ), a multiple cylinder forming portion (45) and a lower water jacket (37B) surrounding the same, and a cylinder head (4) joined to the upper surface of the cylinder block (43).
8), an upper water jacket (37A) communicating with the lower water jacket (37B) is formed, and a discharge part of a water pump (34) mounted on the engine (E) is connected to the lower water jacket via an inlet pipe (36). The outlet (37o) of the upper water jacket (37A) is connected to the radiator (15) via the outlet pipe (41) and the suction part of the water pump (34) is connected to the inlet (37i) of the jacket (37B). In the motorcycle connected to the radiator (15) through the pipe (35), the inlet opening to one side wall of the lower water jacket (37B) toward the center in the left-right direction of the multiple cylinder forming portion (45). (37i) and an upper water jacket (37i).
A) An engine cooling device for a motorcycle, wherein the outlet (37o) occupying a position immediately above the inlet (37i) is provided on one side wall. 2. The cylinder block (43) according to claim 1, wherein the inlet (37i) is provided on a rear wall of the cylinder block (43), and the inlet pipe (36) connected to the inlet (37i) is provided on a rear surface of the cylinder block (43). Characterized by
Motorcycle engine cooling system. 3. The apparatus according to claim 2, further comprising: a bypass pipe (39) piped to a rear surface of the cylinder block (43) so as to communicate between the outlet (37o) and a suction part of the water pump (34). Characterized by the fact that
Motorcycle engine cooling system.