JPS6258012A - Cooling device for v-engine - Google Patents

Abstract

PURPOSE:To simply and certainly form a water path without special piping by forming diversion delivery paths by means of the mutual fitting planes of crank case components, for example those between a crank case cover and a pump main body or a pump cover. CONSTITUTION:The revolution of impellers 18 of a water pump 15 sucks cooling water from a radiator 21 into the pump 15 through an inlet port 20. Then the cooling water passes through right and left diversion delivery paths 23, 22 and water paths 37, 38 on a crank case cover 14, and is fed into the cooling water jackets 11, 10 in right and left cylinders 2, 1 respectively. After fed into the cooling water jackets in right and left cylinder heads 4, 3, the cooling water returns to the radiator 21 from a thermostat room 25 through a cover 24 and a rubber hose 29. Thus the diversion delivery paths 22, 23 are formed by means of mutual fitting planes between the crank case cover 14 and a pump main body 15 or a pump cover 27, and intended purpose can be therefore accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cooling system for a ■-type engine in which left and right cylinder rows are arranged in a V-shape.

(Prior art and its problems) In general, in a V-type engine, both cylinder rows are separated from each other, so the water pump does not provide cooling water for each cylinder.
Cold n1 water is supplied to the kit via a vibrator. Therefore, it takes time and effort to assemble the pipes for the vibrator, and there is also a high possibility that water will leak from the vibrator.

There is also a cooling system, such as the 11R55-73515, in which the water pump's discharge port is connected to the cooling water jacket of each cylinder, but the water pump itself is extremely large.
However, the structure of pump B itself is complex.

(Means for Solving the Problems) In order to solve the above problems, the present invention forms a water diversion discharge path using the mating surfaces of the crank chamber forming member, for example, the crankcase cover, the pump body, and the pump cover. I try to do that.

In other words, a water pump with a pump shaft parallel to the crankshaft is called V
A water pump is arranged in the bank, and the inlet of the cooling water jacket of each cylinder is opened at one end surface in the crankshaft direction of the crank chamber forming member, and the water pump is aligned with the end surface of the crank chamber forming member where the cooling water inlet is opened. A water pump body is joined to the mating face, and a pump cover having a cold water suction port is joined to the pump body, and the crank chamber forming member, the pump body and the pump cover are joined to the pump body. The mating surfaces between the pump covers form a water distribution discharge path extending from the suction port in a direction generally perpendicular to the crankshaft and reaching each cooling water jacket.

(Example) Figures 1 and 2 show a cooling system applied to a two-cylinder vertical axis V-type liquid-cooled engine. In Figure 2, the left and right cylinders 1.2 are V-shaped when viewed from above. A cylinder head 3.4 is fixed to each cylinder 1.2, and a J-arm cover 5 is fixed to each head 3.4. Inside each set of cylinder 1 and cylinder head 3 on the left and cylinder 2 and cylinder head 4 on the right, there are Reigetsu 1 water jacket 10.10' and cooling water jacket 11.11', respectively.
is formed.

The entire lower surface (the front surface in FIG. 2) of the crankcase 13 is formed as an open end, and a crankcase cover 14 that covers the entire open end of the crankcase is fixed to the lower surface of the crankcase by a plurality of bolts 40. ing.

The water pump 15 is arranged in a V bank.

As shown in FIG. 1 J3, which is a partial cross-sectional view taken in the direction of arrow 1 in FIG. 2, the crankshaft 6 is arranged vertically, and the left cylinder 1 is arranged higher than the right cylinder 2. The crankcase 13 is formed in one piece with the cylinder 1.2.

Cooling water tank 11 for crankcase 13 10111
The lower end inlet part is the lower surface (mating surface) 1 of the crankcase 13.
3a, and the upper surface (mating surface) 14a of the case cover 14 is joined to the lower surface 13a of the crankcase by bolts 40 as described above. A pair of left and right water channels 37.38 are formed in the crankcase cover 14, and each of the water channels 37.38 is connected to a cooling water jet 10.1.
It is directly connected to the lower end entrance of No.1. The lower end of the right water channel 38 extends and widens to the left in a direction perpendicular to the crankshaft 6,
It opens downward. The left water channel 37 has the same cross-sectional area as the upper end and extends downward and opens downward. A horizontal mating surface 14b is also formed on the lower surface of the crankcase cover 14, and a horizontal upper end mating surface 16a of the pump body 16 of the water pump 15 is joined to the mating surface 14b.
(FIG. 2), the case cover 14 and the crankcase 13 are fastened together. The pump body 16 is integrally equipped with a bearing (pubosu part) extending into the crank chamber.
A pump @17 parallel to the crankshaft 6 is rotatably supported by the boss via a seal 39 and the like. A pump drive 1't719 is fixed to the upper end of the pump shaft 17, and a pump vane 18 is fixed to the lower end. For example, the pump driver 719 is a cam@)! It meshes with gear A7 of the crankshaft 6 via A7. Water diversion discharge passages 22 and 23 are formed on the left and right sides of the lower half of the main body 16, respectively.
5. The upper opening of the left discharge passage 22 is directly connected to the left water channel 37 of the crankcase cover 14. The right discharge passage 23 widens widely to the right at right angles to the crankshaft 6, has a large opening at its upper surface, and is directly connected to the lower surface of the right water channel 38 of the crankcase cover 14. That is, the mating surface 14b of the cover 14 and the mating surface 16a of the main body 16 are used to form a discharge passage 23 extending from the pump blade 18 portion to the right at right angles to the crankshaft 6.

A pump cover 2 is provided on the lower end mating surface 16c of the pump body 16.
The upper end mating surfaces of 7 are joined, and the pump cover 27 is attached to the bolt 4.
2 (FIG. 2), the pump body 16 and crankcase cover 14 are jointly fastened to the crankcase 13. A suction port 20 is formed within the cover 16 . The suction port 20 is connected to an outlet of a radiator 21 above the engine via a pipe (not shown). The cover 27 is also formed with a small-diameter bypass inlet portion 20a, and the bypass inlet portion 20a is connected to the upper end thermostat chamber 25 of the cooling water jacket 11' of the right cylinder head 1.

A thermostat 26 is provided in the thermostat chamber 25. A cooling water outlet thermostat cover 24 projecting upward is provided at the upper end of the thermostat chamber 25 . The thermostat chamber 25 and the upper end of the cold fJJ water outlet of the left cylinder head 3 and the cold water outlet part 10' communicate with each other through a communication passage 31.
The right end portion faces the thermostat chamber 25. A communication passage 31 is formed within the communication pipe 30, and an intake passage 32 is also formed within the communication pipe 30 in parallel to the communication passage 31. The intake passage 32 communicates with the intake holes of the left and right cylinder heads 3.4, and an i:p blister 33 is connected to the center thereof. The carburetor 33 is connected to an air creep (not shown).

The radiator 21 is horizontally arranged above the engine, and a downward inlet 28 on its lower surface is connected to the thermostat chamber 2.
5 (along the same vertical axis). The cover 24 and the inlet portion 28 are connected to each other by a straight rubber hose 29 . Radiator 2
1 is elastically supported by the engine via a suitable bracket and elastic member, and a radiator cooling fan 36 is disposed between the radiator 21 and the upper surface of the engine. 35 is a fan housing.

(Function) The rotation of the vane 18 of the water pump 15 causes the radier letter 2 to
The cooling water sucked into the pump 15 from 1 through the suction port 20 passes through the left and right water distribution discharge passages 22.23, the water channels 37.38 of the crankcase cover 14, and then flows into the left and right cylinders, -1 and 2. Cooling water - supplied to the jackets 10.11 respectively. After cooling the cylinder 1.2, the cooling water jackets 10 of the left and right cylinder heads 3.4, respectively.
', 11' cools the cylinder head 3.4 section, then each cooling water jet 1j gets 10
', 11' reaches the upper end outlet. Cold 74 discharged from the cooling water jacket 11' of the lower right cylinder head 4
1 Water returns from the thermostat chamber 25 to the radiator 21 through the cover 24 and the rubber hose 29, while the cooling water discharged from the cooling water jackets 1 to 10' of the high cylinder head 3 passes through the communication path 31 and returns to the thermostat chamber 2.
5 and returns to the radiator 21 through the cover 24 and rubber hose 29 like the cooling water on the right side.

The i-nermostat 26 detects the temperature of the cooling water in the thermostat chamber 25, opens when the temperature of the cooling water is higher than the set temperature, and closes when it is lower.

Note that when the thermostat chamber 25 is closed, a portion of the cold 11 water is returned from the bypass outlet section of the thermostat chamber 25 to the bypass inlet section 20a of the water pump 15.

Regarding the KTi method, the crankcase 13, crankcase cover 14, pump body 16 and pump cover
27 are all molded by die casting.

However, the pump main body 16 is cast only with a mold in two directions, T'' above.

In addition, since all the water channel surfaces can be carved out, there is no risk of leakage of cold water even when components are manufactured by high-pressure die-casting that involves air. Furthermore, plugs and the like are not required, and manufacturing costs can be reduced. The J3 crankcase 13 itself is also manufactured using a high-pressure die casting method.

(Another embodiment) (1) The illustrated embodiment is a cooling water applied to a vertical shaft type engine with a vertical crankshaft, but the present invention is a cooling water applied to a vertical shaft type engine with a vertical crankshaft.
B can be applied to liquid-cooled engines.

(2) V of multiple cylinders such as 4 cylinders, 6 cylinders or 8 cylinders
The present invention can also be applied to type liquid-cooled engines.

(Effect of the invention) According to the present invention as explained above:.

(1) Using the end face of the crank chamber forming member, for example, the end face of the crankcase cover, the water pump body, and the pump cover, the suction of the pump [1 to the cooling water jacket part of each cylinder] Since a water diversion discharge path is formed, a waterway can be formed simply by assembling the pump body and pump cover, eliminating the need for special cooling water hose piping.

Therefore, the assembly work becomes easier, and the fear of cooling water leakage is significantly reduced compared to hose piping.

(2) The mating surfaces between the crank chamber forming member, the pump body, and the pump cover form a water discharging path that extends from the suction port in a direction approximately perpendicular to the crankshaft and reaches each cooling J water jacket, so the water pump By separating the cylinder from the drive shaft to a certain extent, it is possible to prevent the cooling water jacket in the cylinder from becoming deeper than necessary, and it can also be used with a small water pump with a small scroll, which is useful for downsizing the engine.

(3) If the crankcase cover is used as the first crank chamber forming member that forms the diversion channel, the pump body and pump cover can be collinear with the crankcase together with the crankcase cover, so the assembly will be easier. The number of man-hours and bolts can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a front view, partially in section, of a vertical axis V-type liquid-cooled engine to which the present invention is applied, and FIG. 2 is a view taken in the direction of the ■ arrow in FIG. 1.2... Cylinder, 3.4... Cylinder head, 10, 10', 11.11'... Cold N] water jacket, 13... Crank case, 14... Crank case cover ( Example of crank chamber forming member), 15
...Water pump, 16...Pump body, 22.23.
...Discharge path, 27...Pump cover agent Patent attorney
Shiki Hitomori 1. : Figure 1 1, = b riu) f yearyu

Claims (1)

[Claims] (1) In a V-type engine in which the left and right cylinder rows are arranged in a V-shape and a cooling water jacket is provided for each of the left and right cylinder rows, a water pump having a pump shaft parallel to the crankshaft is arranged in the V bank, The inlet portion of the cooling water jacket of each cylinder is opened at one end surface in the crankshaft direction of the crank chamber forming member, and a water pump mating surface is formed on the end surface of the crank chamber forming member where the cooling water inlet portion is opened. The mating surface of the water pump body is joined to the mating surface, and a pump cover having a cooling water suction port is joined to the pump body. 1. A cooling device for a V-type engine, characterized in that a water discharge passage is formed that extends in a direction substantially perpendicular to the shaft and reaches each cooling water jacket.