JPH07259559A - Cooling system of v-type engine - Google Patents

Abstract

PURPOSE:To improve the extent of assembling property in piping connection by forming an intake manifold and a cooling water passage integrally as one body, an setting up the whole of a thermostat mounting flange surface and a cooling water outlet in one end face of a cooling water passage body in a centralizing manner. CONSTITUTION:This cooling system is formed with a cooling water passage body 13 overhanging from a crank axial end of a cylinder block to the side of a transmission. In order to connect each cooling water inlet and this cooling water passage body 13 to each other, three ports 20a to 20c as cooling water outlets are extended to an end face of the transmission side of the cooling water passage body 13 in the sama direction each. In addition, a joining surface for setting a thermostat case 21 housing a thermostat T is formed in the end face where these hose ports 20a to 20c are installed, and a bolt is inserted in parallel with an axis of the hose ports 20a to 20c and thus the thermostat T is attached to this joined surface. Moreover, an outlet of a bypass passage is opened to this joined surface, with this constitution, a working property of piping connection is well improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a V-type engine, and more particularly, at least a part of an intake manifold has two
The present invention relates to a cooling device for a V-type engine arranged between two banks.

[0002]

2. Description of the Related Art At least a part of an intake manifold is arranged between two banks of a V-type engine, and cooling water connectors, which are separate from the intake manifold, are provided at both ends of both banks in the crankshaft direction. Japanese Patent Application Laid-Open No. 60-98120 discloses a cooling device configured such that the cooling water that has passed through the cooling water connector is returned to the radiator via a thermostat provided on the outlet side of the cooling water connector.

In this conventional cooling device, the intake manifold and the cooling water connector are separate bodies, and both are bolted from above the engine body, so that the bolt fastening portions of the intake manifold and the cooling water connector are mutually connected. Since they interfere with each other, the assembly work tends to be complicated. Moreover,
In order to secure the sealing property with the water jacket, a large number of bolt fastening points of the cooling water connector are required.

[0004]

That is, according to the above-mentioned conventional structure, since the assembling man-hour is inevitably increased, not only the high assembling performance cannot be obtained, but also the maintainability tends to deteriorate. .

The present invention has been devised in order to eliminate such disadvantages of the prior art, and its main purpose is to:
It is an object of the present invention to provide a cooling device for a V-type engine configured so as to obtain high assemblability.

[0006]

According to the present invention, there is provided a V-type engine in which at least a part of an intake manifold is arranged between banks of two cylinder rows arranged in a V-shape. In the cooling device, a cooling water passage body having an opening communicating with each water jacket of both banks is integrally formed on one end side in the crankshaft direction of a portion arranged between the banks in the intake manifold, and the cooling water is formed. This is achieved by arranging all of the thermostat case mounting flange surface and the cooling water outlet on one end surface of the passage body. In particular, it is preferable to form a connection port for the outlet of the bypass passage provided at one end face of the cooling water passage body and a connection port for the connecting pipe communicating with the water pump on the mounting surface of the thermostat case for the cooling water passage body.

[0007]

According to this structure, since the cooling water passage body is simultaneously attached to the cylinder head by attaching the intake manifold to the cylinder head, it is not necessary to assemble them separately. In addition, the cooling water outlets from the engine are centrally arranged in the same direction, so that the directionality of the connection work can be unified. Further, by bolting the thermostat case to the cooling water passage body, the connection with the bypass passage and the connecting pipe is completed at the same time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings.

1 and 2 show a schematic structure of a V-type engine to which a cooling device according to the present invention is applied.
This engine consists of 3 cylinders each,
Further, it has a pair of banks 1a and 1b arranged in a V shape, and an intake manifold 4 connected to an intake port 3 provided in the cylinder head 2 is attached at a position sandwiched between these two banks. There is.

The intake manifold 4 includes an intake port connection passage body 7 having an injection valve mounting hole 5 and an individual intake passage 6 corresponding to each cylinder, and an individual intake air extending upward from one bank 1a. 2 with a branch pipe body 10 composed of a pipe 8 and a surge tank 9 integrally formed at its upstream end
It is composed of two parts and is fixed to the cylinder head 2 by fastening a plurality of bolts (not shown).

As shown in FIGS. 3 and 4, the intake port connecting passage body 7 is provided with a joint surface 11 for the cylinder head 2 and a mounting surface 12 for the branch conduit body 10. A cooling water passage body 13 that overhangs from the crankshaft direction end of the cylinder block to the transmission side is integrally formed at the transmission-side end portion of the intake port connection passage body 7.

The cooling water passage body 13 is curved in a substantially U-shape when viewed from above, and the cooling water passage 15 is provided with openings 14 opened at the joint surface 11 with the cylinder head 2 at both ends thereof.
Is installed inside. Therefore, when the intake port connection passage body 7 is joined to the cylinder head 2, both banks 1a and 1b are opened through an opening (not shown) provided in the cylinder head 2.
The cooling water passage 15 communicates with the water jacket 16 (see FIG. 1).

As shown in FIG. 5, this cooling system includes an air amount control device 17 such as a fast idle valve, a throttle body, and a bypass air control valve, a heat exchanger 18 of a heater, and a radiator 19. In order to connect these cooling water inlets and the cooling water passage body 13 to each other, hose openings 20a to 20c as cooling water outlets extend in the same direction on the end face of the cooling water passage body 13 on the transmission side. Has been issued. Also, these hose openings 20
A joint surface 22 (FIG. 4) for mounting the thermostat case 21 that accommodates the thermostat T is formed on the end surface provided with a to 20c.
The bolt 23 parallel to the axis of the hose ports 20a to 20c.
The thermostat case 21 is attached by inserting. In addition, an outlet 24 (FIG. 3) of the bypass passage is opened in the joint surface 22.

Below the intake port connecting passage body 7 between the banks 1a and 1b, a connecting pipe 26, one end of which is connected to a water pump 25 provided on the crank pulley side of the engine, is arranged in the crankshaft direction. It has been extended.

On the other hand, at the joint surface of the thermostat case 21 to the cooling water passage body 13, as shown in FIG. 6, the outlet 2 of the bypass passage opened at the end surface of the cooling water passage body 13.
4 and the connecting pipe 26.
And a hole 28 for receiving the other end of the. Therefore,
By bolting the thermostat case 21 to the cooling water passage body 13, both the connecting pipe 26 and the outlet 24 of the bypass passage are connected to the thermostat case 21. Further, the thermostat case 21 has a hose port 29a connected to the outlet of the air amount control device 17 and a hose port 29b connected to the outlet of the heat exchanger 18 of the heater.
It is projected so as to face the same direction as a to 20c.

The cooling water passage 15 on the upper surface of the cooling water passage body 13.
As shown in FIGS. 4, 7 and 8, a mounting seat 31 for mounting the exhaust gas recirculation valve 30 is formed in the central portion of the portion surrounded by. The seat surface of the mounting seat 31 is provided at a position lower than the pipe wall upper surface 15a of the cooling water passage 15, and is connected to the upstream passage 34 with respect to the valve seat 33 so as to communicate with the recirculation gas passage 32 of the exhaust gas recirculation valve 30. Downstream passage 3
5 and 5 are adjacent to each other and open. Further, the cooling water passage body 13 and the mounting seat 31 are connected to each other by a rib 36, whereby the rigidity of the cooling water passage body 13 and the mounting seat 31 is maintained and improved.

The upstream passage 34 has its starting end 34a communicating with an exhaust outlet (not shown) provided in the cylinder head 2 and is bent at a substantially right angle on a horizontal plane below the cooling water passage 15. A horizontal portion (see FIG. 4) 34b,
It is composed of a vertical portion 34c that rises vertically toward the upper surface opening of the mounting seat 31. The downstream passage 35 linearly penetrates the mounting seat 31 in a substantially vertical direction, and communicates with a chamber 37 that distributes the reflux gas to the individual intake passages 6. Further, the valve seat 3 of the exhaust gas recirculation valve 30
Around the vertical portion 34c of the upstream passage near 3
The bulging portion 15b formed in a part of the cooling water passage 15 is adjacent to the cooling water passage 15, and the cooling efficiency of the valve seat 33 of the exhaust gas recirculation valve 30 and the recirculation gas is improved.

As shown in FIG. 5, since the cooling water system is relatively complicated, the assembly work tends to be complicated, and the maintainability tends to deteriorate. According to the present invention, since the cooling water passages are integrally formed in the constituent members of the intake manifold and the connection ports are centrally arranged on one surface, these disadvantages are eliminated.

[0019]

As described above, according to the present invention, by integrally forming the intake manifold and the cooling water passage body, it is not necessary to assemble them separately, so that the assembling property is remarkably improved. Further, since the cooling water passage body is simultaneously attached to the cylinder head by fastening the intake manifold to the cylinder head, the number of fastening points can be reduced. In addition, since the cooling water system can be centrally arranged in the same direction, the cooling water path is simplified, the passage is shortened, and the pipe connection workability is improved.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a partially cutaway engine according to the present invention.

FIG. 2 is a schematic plan view showing a partially cutaway engine according to the present invention.

FIG. 3 is a side view of a cooling water passage body according to the present invention.

FIG. 4 is a plan view of a cooling water passage body according to the present invention.

FIG. 5 is a cooling system diagram of an engine to which the present invention is applied.

6 is a sectional view of the thermostat case taken along the line VI-VI in FIG.

FIG. 7 is a front view showing a part of a mounting portion of an exhaust gas recirculation valve, which is cut away.

8 is a cut end view of the cooling water passage body taken along line VIII-VIII in FIG.

[Explanation of symbols]

 1 bank 2 cylinder head 3 intake port 4 intake manifold 5 injection valve mounting hole 6 individual intake passage 7 intake port connecting passage body 8 individual intake pipe 9 surge tank 10 branch pipe body body 11 joint surface 12 mounting surface 13 cooling water passage body 14 Opening 15 Cooling water passage 16 Water shacket 17 Air quantity control device 18 Heat exchanger 19 Radiator 20 Hose mouth 21 Thermostat case 22 Joint surface 23 Bolt 24 Bypass passage outlet 25 Water pump 26 Connecting pipe 27 Opening 28 Hole 29 Hose mouth 30 Exhaust Recirculation valve 31 Mounting seat 32 Recirculation gas passage 34 Upstream passage 35 Downstream passage 36 Rib 37 Chamber

Claims (2)

[Claims] 1. A cooling device for a V-type engine in which at least a part of an intake manifold is arranged between banks of two cylinder rows arranged in a V-shape, and the cooling device is provided between the banks in the intake manifold. A cooling water passage body having an opening communicating with each water jacket of both banks is integrally formed on one end side in the crankshaft direction of the arranged portion, and a thermostat case is attached to one end surface of the cooling water passage body. A cooling device for a V-type engine, wherein all of the flange surface and the cooling water outlet are centrally arranged. 2. A connection port for an outlet of a bypass passage provided at one end face of the cooling water passage body and a connection port for a connecting pipe communicating with a water pump on a mounting surface of the thermostat case for the cooling water passage body. The cooling device for a V-type engine according to claim 1, wherein and are formed.