JPS6293426A - Cooling water pump for v-type multicylinder engine - Google Patents

Abstract

PURPOSE:To enable the two cylinder banks of a V-type multicylinder engine to be cooled equally by providing two discharge openings designed to have virtually the same area, which lead to the water jackets of the two cylinder banks, on the nearly symmetrical positions of the two cylinder banks, and at the same time, forming both discharge channels in an asymmetric shape. CONSTITUTION:The casing 21 of a cooling water pump 12 is provided with two discharge channels 23, 24, which extend in the nearly tangential direction of an impeller 22 respectively, and at the same time, are connected to discharge openings 25, 26 leading to the water jackets of the cylinder blocks of both cylinder banks respectively. Said discharge openings 25, 26 have virtually the same area, and are provided on the nearly symmetrical positions of both cylinder banks. Said cooling water pump 12 is placed above the central position of both discharge openings 25, 26, and further, said two discharge channels 23, 24 are formed into such a shape different from each other that the flow rate of cooling water for supplying to said two discharge channels 25, 26 is equalized so as to obtain the equal resistance of flow channels.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a cooling water pump for a V-type multi-cylinder engine, and particularly to a cooling water pump for use in both cylinder banks of a ■-type multi-cylinder engine. 3゜〈Prior art〉 Generally, in a V-type multi-cylinder engine (42), since it is necessary to cool both banks equally, The discharge passages of a single cooling water pump are made to branch evenly.However, using a cooling water pump with a discharge passage of 411-
If you want to cool both banks equally by providing a separate branch passage, you may need to increase the size of the cylinder block to provide the branch passage, or provide a separate conduit.
This may become an obstacle to reducing the size and weight of the engine.

It is conceivable to use a cooling water pump with two discharge passages to eliminate the need for such a branch passage, but generally the cooling water pump used is It consists of a centrifugal pump, and the discharge passage extends tangentially to the impeller, so the cooling water pump is installed approximately at the center of the V-type engine, and both banks (42 In the case where the discharge openings for the cylinder block are to be installed at symmetrical positions (5: I) on both banks of the cylinder block, the dimension of the cooling water cylinder f tends to be larger than the 1F dimension, especially when the cooling water cylinder [
[The casing of the water pump f tends to protrude downward, and V
This is likely to be a restriction for Layers 1 to 10 of multi-cylinder models.

However, if the discharge interval of the cooling water pump is provided at an asymmetrical position between the two banks, each bank will not be cooled equally, resulting in a disadvantage that the performance of the engine will be reduced by 1 (4).

<Problems to be Solved by the Invention> In view of the shortcomings of the prior art, the main purpose of the present invention is to be able to cool both banks of a V-type multi-cylinder engine evenly, and to An object of the present invention is to provide a cooling water pump for a V-type child cylinder engine having a compact configuration.

<Means to Solve the Problems> According to the present invention), this purpose is to provide a suction passage of A, an impeller, and two discharge passages extending substantially tangentially to the impeller. A cooling water pump for a V-type sub-cylinder engine, which has discharge openings reaching the water jackets of both cylinder banks of the V-type multi-cylinder engine, having approximately equal areas, and having approximately symmetrical positions between the two banks. iζ7, but substantially equalizes the rate of cooling water supplied to the four-way jackets of both banks'<< fi7+ Cooling water characterized by having both discharge passages of an asymmetrical shape ↓
This is achieved by providing ζnzo.

<Function> In this way, by providing the two discharge passages asymmetrically, even if the cooling water pump [1] is provided at a symmetrical position between the two banks of the engine, the cooling water pump casing It is possible to freely determine the layout of the engine, and at the same time, it is possible to uniformly cool both banks of the engine, and at the same time, the configuration of the cooling water pump can be changed to one bank.

<Embodiment> Hereinafter, preferred embodiments of the present invention will be explained in detail with reference to the accompanying drawings. 3. Figures 1 and 2 show a \/type 6-cylinder L to which the cooling water cylinder 1 according to the present invention is applied. To both banks of cylinder cylinder block 1, B
Around the cylinder 2 formed in , there are formed cylinders 1 to 3 through which cooling water flows. In Figure 1, the confluence pipe 4, cold 7Jl water outlet [15 and pipe 6] connected to
It is sent out to the radiator 8 by a pump. The cooling water cooled to 7J+ by the radiator 8 passes through the pipe line 7.9, and then passes through the switching valve 10, which controls the heat-sensitive valve (not shown), and the pipe line 11, which is installed in the axial direction between both banks of the engine. Through,
Cooling water pump 12 having a casing 21 integrally formed at the center of the other axial end of the cylinder 10
Go to ↑.

When the engine is warmed up, the switching valve 10 connects the pipe line 9 and the pipe line 11, or when the engine is cold, the communication between the pipe line 9 and the pipe line 11 is cut off. The cooling water from the branch pipe 4 passes through the cooling water outlet 15 and the pipe 16, without passing through the radiator 11, and heats the interior of the vehicle.
Heater 1j'18 (,: supplied.L---
The door 1-2 and pipe 17 from Kuni f'>'18 are connected to the cold room 1
1 water is sent between the two banks of the engine (through the pipe 19 and 8 valve 10, which extends through the conduit i'+ 4.::, and the water is sent 1i- by the cooling water pump '12). C again A
The second 33 cooling water pump 12's inpenin 22 is driven by, for example, a timing bell for driving the engine's camshaft]. ), the cooling water pump 12 is rotated by the drive shaft 1/1.
Two discharge passages 23 and 24 are formed in the thing 21,
The discharge openings 25.2 extend substantially tangentially to the impeller 22, respectively, and are located in the J'-th cylinder 1-3 of the engine bank.
In this embodiment, the discharge opening 25)
, 26 [, 1-; 7 Is the w-form C' d? Substantially 1
6 times - 1 area to the right, and) both banks are placed in approximately symmetrical positions.

In this case, the gap between both discharges is 125.2 (from 5 to A-tajito! Knot 3), and the supply is 4' [,
Rupes; θ River water flow #ii 'G-To equalize (:
X (yo, nεI, [1 water bottle / ゛12)・6 cars 1!1 appearance 11.12! v, 2(') between E12. Is it possible to install it at the middle IN of the S-line?
If the cold engine 12 and the crankcase 27 interfere with each other, it can become a constraint.

Therefore, according to the present invention, the cooling water pump 12 is located approximately at the center of both discharge openings 25 and 26, and is installed at the position of both discharge openings [12b, 26J: rear openings] and 11j.
Being beaten. Therefore, according to the cJ of the present invention, in order to equalize the flow velocity of the cooling water supplied to both discharge ports 25.26, the shapes of both discharge passages 23.2/1 are designed so that the flow resistance is equal to 7M.
% different shapes (as specified by J).

<Effects of the Invention> As described above, according to the present invention, both banks of G in a V-type multi-cylinder engine are fixed and the cold 7. (I rurudo simultaneous (u
.

A suitable IHJ cooling water pump is provided which has an extremely compact configuration and its effectiveness is extremely human-friendly.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the eastern part of a V-type six-cylinder engine to which a cold water pump according to the present invention is applied. Figure 2 is a 3°

Claims (1)

[Claims] (1) A cooling water pump for a V-type multi-cylinder engine having a single suction passage, an impeller, and two discharge passages extending substantially tangentially with respect to the impeller, the cooling water pump comprising: The discharge openings leading to the water jackets of both cylinder banks are made to have approximately the same area and are provided at approximately symmetrical positions of both banks, and in order to approximately equalize the amount of cooling water supplied to the water jackets of both banks. A cooling water pump characterized by having both discharge passages asymmetrically shaped.