JP3018506B2 - Cooling water passage structure for V-type engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water passage structure for a V-type engine, and more particularly to a thermo-housing for accommodating a thermostat provided in a cooling water suction pipe in a space between cylinder banks on each side of the V-type engine. The present invention relates to a cooling water passage structure of a V-type engine provided with a cooling water discharge pipe.

[0002]

2. Description of the Related Art As engines, there are a series engine in which cylinders are arranged in series, and a V-type cylinder in which cylinders are arranged in a V-shape, depending on the arrangement of cylinders.

In a V-type engine, each side cylinder head is mounted on an upper surface of a substantially V-shaped cylinder block, and each side cylinder bank is formed in a V-shape.

In the V-type engine, a space is formed between the cylinder banks on the upper side, an intake manifold is disposed in the space, and a cooling water suction pipe for cooling water piping and a cooling water discharge. Pipes are provided.

For example, as a cooling water passage device in a V-type engine, as disclosed in Japanese Utility Model Laid-Open Publication No. Sho 62-91615, cooling water is provided in a water jacket formed in each of a pair of cylinder banks of the V-type engine. A water pump for feeding water is arranged on one of the cylinder banks in the crankshaft direction, and a collecting pipe for joining cooling water from each water jacket and leading to a radiator is arranged on the other of the two banks in the crankshaft direction. In some cases, a thermo-housing for accommodating a thermo-valve is integrally formed in a pipe, and a connecting valve for connecting the thermo-housing and the water pump is disposed in a space between the cylinder banks.

[0006]

By the way, when a V-type engine is installed vertically driven by FR (front engine / rear drive), cooling water piping such as a cooling water intake pipe, a thermo-housing, and a cooling water discharge pipe is used. Space to place the kind
It was difficult to secure the space between the cylinder banks on each side.

That is, in a vertical V-type engine,
The radiator is arranged at a distance from the front of one cylinder block in the crankshaft direction, and the water pump is arranged at the front of one cylinder block in the crankshaft direction.
The cooling water is guided to a water pump in front of the cylinder block by a cooling water suction pipe from a radiator, and is circulated from the cylinder block to each cylinder head. ), Is collected by a collecting pipe, and returned to a radiator in front of the cylinder block by a cooling water discharge pipe connected to the collecting portion.

However, an intake manifold is provided in a space between the cylinder banks of the V-type engine. In this intake manifold, each side surge tank connected to each side cylinder head through each side branch pipe is located below the space and is arranged close to the cylinder block.

For this reason, it is difficult to secure a space for disposing the cooling water discharge pipe connected to the thermo-housing and the collecting pipe interposed in the cooling water suction pipe in the space of each cylinder bank. .

Therefore, the cooling water discharge pipe is provided outside the cylinder block so as to extend in the crankshaft direction, or
As disclosed in the above publication, a cooling water suction pipe is provided in a space below an intake manifold.

However, the provision of the cooling water discharge pipe outside the cylinder block requires that the cooling water suction pipe be separated, so that the cooling water pipes must be separated and manufactured separately. However, there is a disadvantage that the cost and weight are disadvantageous, and furthermore, the compactness cannot be achieved and the appearance is deteriorated.

Further, as disclosed in the above publication, when a cooling water suction pipe is provided in a space below the intake manifold,
It is possible to achieve a certain degree of compactness. However, in this publication, since the thermo-housing is disposed so as to protrude outward from the collecting pipe and the cooling water discharge pipe is disposed outside the cylinder block, compactness cannot be sufficiently achieved. In addition, there is a disadvantage that the appearance is deteriorated. Also, in this publication, in order to avoid interference between the end of the cylinder block in the other direction of the crankshaft or the surge tank and the connecting portion of the cooling water suction pipe with the collecting pipe, the cooling water suction pipe is moved upward from the cylinder block. The intake manifold must be disposed at a distance, and the space for disposing the intake manifold is reduced. As a result, the intake manifold protrudes outward from the space between the cylinder banks on each side, which hinders compactness. In addition, the capacity of the surge tank provided in the intake manifold may be reduced.

[0013]

SUMMARY OF THE INVENTION In order to solve such problems, the present invention relates to an intake manifold having a surge tank connected to each cylinder head of a V-type engine via a branch pipe. Is provided in a space between the cylinder banks on each side of the V-type engine, in which cooling water from a radiator is introduced to a water pump provided on one side in the crank axis direction. In a cooling water passage structure of a V-type engine, which is provided with a cooling water discharge pipe for returning cooling water collected in a collecting pipe provided on the other side in the axial direction to a radiator, the respective side surge tanks are respectively disposed in respective directions in the crankshaft direction. By displacing and displacing, a surplus space is exposed in each of the space portions, and a thermostat inserted in the cooling water suction pipe is stored in each of the surplus spaces. Characterized in that the motor housing is disposed between the cooling water discharge pipe.

[0014]

With the above construction, the cooling water is provided in each of the excess spaces that appear when the surge tanks on each side of the V-type engine are displaced relative to each other in the crankshaft direction. By arranging the thermo-housing and cooling water discharge pipe interposed in the suction pipe, interference between the end of the cylinder block in the other direction of the crankshaft and the connection between the surge tank and the cooling water discharge pipe is avoided. It is not necessary to dispose the cooling water discharge pipe upward from the cylinder block, and the space for disposing the intake manifold is not reduced. It becomes possible to do.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

1 to 3 show an embodiment of the present invention. 2 and 3, reference numeral 2 denotes a V-type engine, 4
Is a cylinder block, 6 is a cylinder head, and 8 is a cylinder head cover. The V-type engine 2 has an oil pan 10 attached to a lower portion of a V-shaped cylinder block 4 and upper cylinder heads 6L and 6R and upper and lower cylinder head covers 8L and 8L, respectively.
8R is placed. The one-side cylinder head 6L and the one-side cylinder head cover 8L are disposed on one side in the width direction of the V-type engine 2 (the lower side in FIG. 2). The other side cylinder head 6R and the other side cylinder head cover 8R are located on the other side in the width direction of the V-type engine 2 (upper side in FIG. 2).
It is arranged in.

The V-type engine 2 includes a cylinder head 6 for each side.
By mounting L, 6R on the cylinder block 4,
Each side cylinder bank 12L, 12R is formed in a V-shape, and a space 14 is formed between each side cylinder bank 12L, 12R.

The space 14 has an intake manifold 16.
Are arranged. The intake manifold 16 is provided with an intake pipe 18.
And each side surge tank 20 connected to the intake pipe 18
L, 20R, and these respective side surge tanks 20L, 20R
And the respective side branch pipes 22L, 22R connected to the respective side cylinder heads 6L, 6R.

In this embodiment, each side branch pipe 22L, 22R is provided with a lower one-side surge tank 20 in FIG.
L, one end of which is connected to first, third, and fifth cylinders (not shown) provided on the upper other cylinder head 12R. 2nd and 3rd
Branch pipes 22R-1, 22R-2, 22R-3 and FIG.
, One end of which is connected to the other surge tank 20R on the upper side, and the other end of which is connected to the other side of the second, fourth, and sixth cylinders (not shown). And fourth and sixth branch pipes 22L-2, 22L-4, 22L-6.

A water pump 24 is provided in the space 14 in which the intake manifold 18 is provided, in front of the cylinder block 4 which is one side in the crankshaft direction (the direction of arrow A). The water pump 24 is connected to a cooling water suction pipe 26 that guides cooling water from a radiator (not shown). The cooling water suction pipe 26 is connected to the radiator at a connecting portion 30 on one end side, and merges an intermediate merging portion 30 with a merging portion 46 of a cooling water discharge pipe 38 described later, and connects the thermo housing 32 to the merging portion 30. The introduction part 34 on the other end is connected to the water pump 24.

The cooling water supplied by the water pump 24 is
The water jackets (not shown) of the respective cylinder heads 6L and 6R flow from the front, which is one side in the crankshaft direction of the cylinder block 4, and the respective cylinder heads 6L and 6R flow.
Are collected by a collecting pipe 36 provided at the rear, which is the other side in the crankshaft direction. A cooling water discharge pipe 38 that guides the collected cooling water to the radiator and returns the collected cooling water to the radiator is connected to the collecting part 36. The cooling water discharge pipe 38 is connected to a connecting portion 40 on one end side.
Is connected to the collecting pipe 36, the intermediate extending portion 42 is disposed in the space 14 below the one-side surge tank 20 </ b> L, and the merging portion 44 at the other end merges with the merging portion 30 of the cooling water suction pipe 26. After having been made to flow, it is diverted to the diverter 46 and is connected to a radiator (not shown).

As shown in FIG. 1, the surge tanks 20L and 20R on each side of the intake manifold 16 are respectively displaced in the direction of the crankshaft (the direction of arrow A) to be disposed in the space portion 14. Each of the extra spaces 48 and 50 is provided so as to appear. That is, the one-side surge tank 20L is deviated to the left in FIG. 1 so that the other surplus space 48 appears at the rear, which is the other side in the crankshaft direction. Also, the other side surge tank 20R is shifted rightward in FIG.
0 appears.

On the other hand, in the surplus space 50, the cooling water suction pipe 26
And a junction part 44 of the cooling water discharge pipe 38 is arranged.
On the other hand, the surplus space 48 has a connecting portion 4 of the cooling water discharge pipe 38.
0 is arranged.

Next, the operation will be described.

When the V-type engine 2 is operated, cooling water cooled by a radiator (not shown) flows into a water pump 24 through a cooling water suction pipe 26 and a thermo-housing 32, and this water The pump 24
Pumped to the water jackets (not shown) of the cylinder heads 6L and 6R on each side of the V-type engine 2,
Has cooled. Thereafter, the cooling water is supplied again from the collecting pipe 36 to the radiator (not shown) by the cooling water discharge pipe 38.

Here, each of the cylinder banks 12L, 12L
Each side surge tank 20L disposed in space 14 between R
As shown in FIG. 1, thermostats (see FIG. 1) are provided in each of the extra spaces 48 and 50 that appear by arranging the 20Rs in the crankshaft direction (the direction of arrow A) with a slight deviation in each direction. Thermo housing 32 for accommodating (not shown)
And a cooling water discharge pipe 38 are provided. That is, the confluence portion 44 of the thermo-housing 32 and the cooling water discharge pipe 38 is disposed in one surplus space 50, and the connecting portion 40 of the cooling water discharge pipe 38 is disposed in the other surplus space 48. At this time, the capacities of the respective surge tanks 20L and 20R do not change, and therefore, there is no fear that the power of the V-type engine 2 is reduced.

As shown in FIGS. 1 and 3, the cooling water discharge pipe 38 is provided at the end 52 of the cylinder block and the one-side surge tank 20L at the rear, which is the other side in the crankshaft direction.
And the communication portion 40 can be avoided, so that it is necessary to arrange the cooling water discharge pipe 38 to be separated upward from the cylinder block 4 in order to avoid the interference as in the related art. The installation space is not reduced.

As a result, the intake manifold 16 does not protrude, the V-type engine 2 can be made compact, which is practically advantageous, and the cooling water pipes can be arranged in the space portion 14 so that The appearance of the mold engine 2 can be improved.

On the other hand, the cooling water suction pipe 26 and the cooling water suction pipe 26 are provided in the surplus space 50 by arranging the thermo-housing 32 interposed between the cooling water suction pipe 26 and the junction 44 of the cooling water discharge pipe 38. Since the water discharge pipe 38 can be integrally cast, the weight of the cooling water suction pipe 26 and the cooling water discharge pipe 38 can be reduced and the manufacturing cost can be reduced, which is economically advantageous.

Further, a connecting portion 28 which is an upstream portion of the cooling water suction pipe 26 and a merging portion 44 which is a downstream portion of the cooling water discharge pipe 38 are connected to the V-type engine 2 in the direction of the crankshaft. (Left in FIG. 1), the piping between the cooling water intake pipe 26 and the cooling water discharge pipe 38 can be easily performed in the case of an FR vehicle (a front engine rear drive vehicle). Yes, practically advantageous.

[0031]

As described above in detail, according to the present invention, the intake manifold protrudes outward from the space between the cylinder banks on each side to hinder compactness, and the surge tank provided in the intake manifold has a disadvantage. The disadvantage that the capacity is reduced can be avoided. Further, the cooling water pipes are collectively arranged in the space between the cylinder banks, and the cooling water pipes can be integrally cast by the collective arrangement. As a result, the V-type engine can be made sufficiently compact, it can be made practically advantageous in terms of weight reduction and reduction in manufacturing cost, and the appearance of the V-type engine can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a cooling water passage structure of a V-type engine.

FIG. 2 is a plan view of a V-type engine.

FIG. 3 is a partially cutaway side view of a V-type engine.

[Explanation of symbols]

 2 V-type engine 14 Space 16 Air intake manifold 20L / 20R Surge tank on each side 24 Water pump 26 Cooling water suction pipe 32 Thermo housing 38 Cooling water discharge pipe 48/50 Extra space on each side

Claims (1)

(57) [Claims] 1. A space between cylinder banks on each side of the V-type engine, wherein an intake manifold having surge tanks on each side communicating with cylinder heads on each side of the V-type engine via branch pipes on each side is disposed. Then, the cooling water collected from the cooling water suction pipe for guiding the cooling water from the radiator to the water pump provided on one side in the crankshaft direction and the collecting pipe provided on the other side in the crankshaft direction via each of the cylinder heads is returned to the radiator. In a cooling water passage structure of a V-type engine provided with a cooling water discharge pipe, each of the surge tanks on each side is displaced in a direction of the crankshaft to dispose an excess space in the space. A thermo-housing for accommodating a thermostat interposed in the cooling water suction pipe and the cooling water discharge pipe are disposed in the excess space on each side. The cooling water passage structure for an engine.