JPH048298Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a V-type engine.

(Prior art) In recent years, in automobile engines, the inertia effect of the intake air is effectively used to increase the filling efficiency of the intake air.
Attempts are being made to increase the output of engines. In this case, it is known that the lower the flow resistance of the intake passage and the longer the passage length, the higher the intake inertia effect.Therefore, in order to ensure a higher level of intake air filling efficiency, , it is necessary to configure the intake manifold so that an intake passage as long as possible can be obtained.

However, when the intake manifold is configured as described above, if the engine is an in-line engine, a relatively large space can be secured on the side of the engine when the engine is mounted in the engine room of the automobile. Although it is easy to install an intake manifold with a passage configuration like Therefore, it is difficult to mount the intake manifold on the side of the engine as in the above-mentioned in-line engine. For this reason, V-type engines generally have a pair of left and right intake manifolds connected to each cylinder of both left and right banks of the engine in a state where they cross each other, as disclosed in Japanese Patent Application Laid-Open No. 59-115460. By arranging it in the idle space formed between the left and right banks, that is, the central space of the V bank, the intake passage is made to be longer.

It is desirable that the pair of left and right intake manifolds be integrally formed from the viewpoint of ensuring good assembly to the engine body. It was customary to integrally mold the manifold by casting.

On the other hand, engine cooling water is normally returned to the radiator via the cylinder block and cylinder head, and for this purpose a water jacket and its outlet are formed in the cylinder head (in practice). (Refer to Publication No. 1983-35645).

Since such piping for returning cooling water from the cylinder head to the radiator is quite long, it is desirable to use only one piping as much as possible from the viewpoint of space saving and cost. From this point of view, in a V-type engine that has two left and right banks, that is, two left and right cylinder heads, the cooling water from both cylinder heads is once collected in the integrally molded intake manifold as described above. It is common practice to connect a pipe extending from the radiator, that is, a common pipe, to this gathering part.

(Problem to be solved by the invention) However, as mentioned above, when a pair of left and right intake manifolds are integrally molded by casting in a state where they intersect with each other, the parting line of the product is complicated, so it is usually If die-cutting molding is adopted, there will be a large number of undercut parts, and the number of post-processing steps such as cutting will increase, reducing the advantages of casting molding. When a core molding method is adopted, there are problems in that the work becomes complicated, mass production becomes difficult, and manufacturing costs increase.

Therefore, the purpose of the present invention is to make it possible to easily manufacture an intake manifold and reduce costs, while also allowing cooling water from both left and right banks to be returned to the radiator through a single pipe, that is, a common pipe. The aim is to provide a V-type engine with a

(Means and effects for solving the problem) In order to achieve the above-mentioned object, the present invention basically makes the intake manifold for the left bank and the intake manifold for the right bank independent of each other. By separately forming the intake manifold, the entire intake manifold can be manufactured easily and its cost can be reduced.

In addition, by configuring intake manifolds for both banks individually, the cooling water from both banks is guided to the cooling water pipes integrally formed at one end of the corresponding intake manifold, and the outlet of this cooling water pipe is are located close to each other so as to be next to each other. Then, a collecting member is connected to these parallel outlet portions, and the cooling water from both banks (both intake manifolds) is collected within this collecting member,
This collected cooling water is returned to the radiator.

Specifically, the configuration is as follows. That is, in a V-type engine in which left and right banks are arranged to form a V-shape with each other, the first intake manifold connected to the left bank and the second intake manifold connected to the right bank are connected to each other. Each of the first and second intake manifolds is formed independently and separately, and is arranged in a central space of a V-bank formed between the two banks, and is provided with a water jet in the corresponding bank at one end of each of the first and second intake manifolds. Cooling water pipes connected to the intake manifolds are integrally formed, and the outlets of the cooling water pipes in the first and second intake manifolds are connected in close proximity to each other, and the first intake manifold and the second intake manifold are connected in close proximity to each other. A collecting member is fixed to one end of the manifold, and the collecting member has an inlet connected to the outlet of each cooling water pipe in the first and second intake manifolds, and a common pipe extending from the radiator. The configuration is provided with one outlet connected to it.

(Example) An example of the present invention will be described below based on the attached drawings.

FIG. 1 shows a six-cylinder V-type automobile engine Z having a pair of left and right banks facing each other at an angle, that is, a first bank 2A and a second bank 2B. cylinder block,
3A and 3B are cylinder heads, and 4A and 4B are intake ports.

Each intake port 4A of the three cylinders on the first bank 2A side has three branch pipes 21 that independently communicate with each intake port 4A, as will be described in detail later.
A, 21B, and 21C are integrally arranged in a row.
The intake manifold 20 (see FIG. 5) is also
Each intake port 4B of the three cylinders on the bank 2B side is provided with a second intake manifold 40 (in which three branch pipes 41A, 41B, 41C are integrally connected and connected to each intake port 4B independently). (see FIG. 5) are connected to each other so as to intersect with each other in a substantially X-shape. These two intake manifolds 20, 40 are integrally joined to form a manifold assembly 9, as will be described in detail later.
The manifold assembly 9 is integrally attached to and detached from the engine side, and is fastened and fixed to the cylinder heads 3A and 3B by mounting bolts 11 arranged on the first bank 2A side and the second bank 2B side, respectively. .

Furthermore, the first intake manifold 20 and the second manifold 40 of the manifold assembly 9 are
The U-shaped intake pipes 7 and 8 are connected to the surge tank 6 through U-shaped intake pipes 7 and 8, which are respectively fitted and connected to the outer ends thereof.

Incidentally, in FIG. 1, the reference numeral 10 is an injector.

Next, the structure and manufacturing method of the first intake manifold 20 and the second intake manifold 40 will be explained with reference to FIG. 2 and subsequent figures.

The first intake manifold 20 is a first intake manifold of the engine Z.
Three branch pipes 21A, 21B, 21C are arranged in a row at the same intervals as the three intake ports 4A on the bank 2A side and have an intake passage 28 inside, and the first
Water jacket 12A on bank 2A side (first
The cooling water pipe 23 connected to the cooling water pipe 23 (see figure) and the connecting portion 22 that integrally connects the three branch pipes 21A, 21B, 21C and the cooling water pipe 23 are integrally formed by a casting method. The cooling water pipe 2
3 is located at one end (one end in the crankshaft direction).

Like the first intake manifold 20, the second intake manifold 40 has three branches arranged in a row at the same intervals as the three intake ports 4B on the second bank 2B side, and has an intake passage 48 inside. Pipe 41A,
41B, 41C, a cooling water pipe 43 connected to the water jacket 12B (see FIG. 1) on the second bank 2B side, and the three branch pipes 41A, 41.
B, 41C and a connecting portion 42 that integrally connects the cooling water pipe 43 to each other are integrally formed by a casting method, and the cooling water pipe 43 is located at one end thereof.

The first intake manifold 20 and the second intake manifold 40 are connected to the first intake manifold 20 and the second intake manifold 40, as shown in FIGS.
Each branch pipe 21A, 21 on the intake manifold 20 side
B, 21C and the branch pipes 41A, 41B, 41C on the second intake manifold 40 side are alternately located and connected to each other to constitute the manifold assembly 9. Therefore, in this embodiment, The first intake manifold 20 and the second intake manifold 40 each have seven joining pieces that can abut against each other in the cross-joined state of both, and the abutting portions of the joining pieces that abut each other by welding the first
The intake manifold 20 and the second intake manifold 40 are integrally joined at seven locations in total. That is, on the outer peripheral surface of the intermediate portion of each branch pipe 21A, 21B, 21C of the first intake manifold 20 and on each branch pipe 41A, 41 of the second intake manifold 40.
On the outer peripheral surface of the intermediate portion of B and 41C, there are upper joint pieces 25A, 25B, and 25C that abut each other in the branch pipe connection direction when the first intake manifold 20 and the second intake manifold 40 are in a cross-joined state. 4
5A, 45B, 45C are formed, and the upper joining piece 25A and the same 45A, which abut each other, are formed.
By welding 25B and 45B and 25C and 45C to each other, the first intake manifold 20 and the second intake manifold 40 are fixedly connected at three locations in the left and right direction in their upper portions.

Additionally, three vehicle body-side joining pieces 26A are provided at the lower part of the flange 22 of the first intake manifold 20 and the lower part of the flange 42 of the second intake manifold 40, which face each other in the cross-joined state.
26B, 26C, 46A, 46B, and 46C are formed at approximately equal intervals in the direction in which the branch pipes are connected, and project in the cross-joining direction of the first intake manifold 20 and the second intake manifold 40. Lower pieces 26A, 26B, 26 that abut against
C, both intake manifolds 20 and 40 by welding and joining 46A, 46B, and 46C, respectively.
are fixedly connected at three locations in the lower portion thereof and in the direction in which the branch pipes are arranged.

Further, on the side surfaces of the flanges 24 of the cooling water pipes 23 of the first intake manifold 20 and the side surfaces of the flanges 44 of the cooling water pipes 40 of the second intake manifold 40, which are closely opposed to each other in the cross-joined state,
Intermediate joining pieces 27 and 47 are formed respectively, and these two intermediate joining pieces 27 and 47
By welding and joining the first intake manifold 20 and the second intake manifold 40 to each other in a state where they abut against each other, the first intake manifold 20 and the second intake manifold 40 are mutually connected not only to the upper part and the vehicle body side part but also to the intermediate position in the vertical direction. They will be fixedly connected.

In addition, in FIGS. 2 and 4, reference numeral 14 indicates a mounting hole of the injector 10, and 15 indicates a mounting bolt 11.
This is a bolt insertion hole for.

Here, the above-mentioned cooling water pipe 23 is configured such that when the first intake manifold 20 is connected to the first bank 2A, the inlet 23a thereof is connected to (the outlet of) the water jacket of (the cylinder head of) the first bank 2A. Therefore, each branch pipe 21A, 21
A mating surface of B, 21C with respect to the first bank 2A,
The mating surfaces of the cooling water pipes 23 and the first bank 2A are flush with each other, as shown in FIGS. 2 to 4. Similarly, the mating surfaces of the three branch pipes 41A, 41B, 41C of the second intake manifold 40 with respect to the second bank 2B, and the cooling water pipe 43
The mating surface of the second bank 2B (inlet 43a) is on the same plane. The outlet 23b of the cooling water pipe 23 and the outlet 43b of the cooling water pipe 43 are adjacent to each other on the left and right, and are opened toward one end in the crankshaft direction. The opening surfaces (flange surfaces) of both outlets 23b and 43b are made to be on the same plane.

When manufacturing such a manifold assembly 9 in which the first intake manifold 20 and the second intake manifold 40 are arranged in a manner that crosses each other, the first intake manifold 20 and the second intake manifold 40 are arranged as described above. If a method is adopted in which the first intake manifold 20 and the second intake manifold 40 are joined together in a crossing state after being cast separately, the manifold assembly 9 Compared to the case of integral casting, the parting line of the product is easier,
Since there are almost no undercut parts, the easy-to-operate punch molding method can be applied, and the casting molding work is simplified compared to the case where the core molding method has to be adopted.

For both the intake manifolds 20, 40,
At one end thereof, that is, on the side where the cooling water pipes 23, 43 are located, one collecting member 52 is fixed using bolts 51 (see FIG. 2). This gathering member 52 has two inlets, a first inlet 52A and a second inlet 52B, and one outlet 52C that is connected to both the inlets 52A and 5B. In the fixed state, the inlet 52A is the second inlet. 1 Intake manifold 2
Connected to the outlet 23b of the cooling water pipe 23 at 0,
Further, the inlet 52B is connected to the outlet 43b of the cooling water pipe 43 in the second intake manifold 40. A common pipe 53 extending from a radiator (not shown) and consisting of a heat-resistant flexible tube is connected and fixed to the outlet 53C by a band 54. As a result, the cooling water from the first bank 2A is transferred to the first intake manifold 20.
The cooling water from the second bank 2B is led to the collecting member 52 through the cooling water pipe 23 of the second intake manifold 40, and the cooling water from the second bank 2B is led to the collecting member 52 through the cooling water pipe 43 of the second intake manifold 40. The collected cooling water from both banks 2A and 2B is led to the radiator through one common pipe 53.

In the above embodiment, the first intake manifold 2
Although the first intake manifold 20 and the second intake manifold 40 are fixedly connected by welding, for example, the first intake manifold 20 and the second intake manifold 40 may also be fixedly connected by bolts. In addition, the outlet 23 of both cooling water pipes 23 and 43
b and 43b may be arranged so as to face each other.

(Effects of the invention) As is clear from the above, the invention has the following effects:
Since the intake manifolds are separately formed for the left and right banks, there are fewer undercuts compared to when the two intake manifolds are integrally cast, and post-processing such as cutting after casting is required. In addition, because there are few undercuts, it is possible to apply the normal die casting method that does not use a core, and the workability of the casting work is improved, making manufacturing easier and reducing manufacturing costs. A great effect can be obtained in this respect.

Furthermore, since the cooling water from both banks can be returned to the radiator through one common pipe, there is no problem in terms of piping space and cost. Of course, since the collecting member that collects the cooling water from both banks is formed separately from the first and second intake manifolds, the structure of the intake manifold itself is simplified as much as possible. Therefore, it is even more advantageous in terms of manufacturing.

Furthermore, since cooling water pipes are integrally formed at one end of each of the first and second intake manifolds, an installation structure in which the cooling water pipes are formed separately and attached to the cylinder head is adopted. Compared to the above, there is no need for mounting flanges, fastening bolts, etc. for the cooling water pipes, and the length of the cooling water pipes in the cylinder row direction can be reduced by the length thereof, so that the engine can be shortened in the cylinder row direction.

Furthermore, cooling water pipes are integrally formed at one end of each of the first and second intake manifolds, and the exits of the cooling water pipes are connected in close proximity so that they are adjacent to each other. from,
When assembling, both intake manifolds can be handled as one unit, and the respective cooling water pipe outlets of both intake manifolds can also be handled as one unit, and the assembly of both intake manifolds can be facilitated. The assembly member can be easily fixed to each cooling water pipe outlet of both intake manifolds.

Moreover, for the above-mentioned reason, both intake manifolds are reinforced with each other via the cooling water pipes, and despite the structure in which separate intake manifolds are used, it is not possible to improve the rigidity of both intake manifolds. can.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a V-type engine showing an embodiment of the present invention. FIG. 2 is an enlarged side view of the intake manifold portion shown in FIG. 1. Figure 3 is a view of the intake manifold after assembly, viewed from the cooling water pipe side. FIG. 4 is a vertical cross-sectional view of FIG. 2. FIG. 5 is a perspective view showing the state of the intake manifold shown in FIG. 2 before being joined. FIG. 6 is a plan cross-sectional view showing the connection portion between the cooling water pipe, the collecting member, and the common pipe. Z...Engine, 1...Cylinder block, 2
A, 2B... Bank, 3A, 3B... Cylinder head, 4A, 4B... Intake port, 6... Surge tank, 7, 8... Intake pipe, 9... Manifold assembly, 12... Water jacket , 20
...First intake manifold, 21A to 21C... Branch pipe, 23... Cooling water pipe, 23a... Inlet, 23
b...Outlet, 40...Second intake manifold, 43
... Cooling water pipe, 43a ... Inlet, 43b ... Outlet, 51 ... Bolt, 52 ... Collective member, 52
A, 52B...Entrance, 52C...Exit, 53...
common pipe.

Claims (1)

[Claims for Utility Model Registration] In a V-type engine in which left and right banks are arranged in a V-shape, a first intake manifold connected to the left bank and a second intake manifold connected to the right bank are provided. intake manifolds are formed separately and independently from each other, and are respectively arranged in the central space of the V bank formed between the two banks, and one end of each of the first and second intake manifolds corresponds to one end of the first and second intake manifolds. Cooling water pipes connected to the water jackets in the banks are integrally formed, and the outlets of the cooling water pipes in the first and second intake manifolds are connected in close proximity to each other, and the first intake manifolds are connected in close proximity to each other, and A collecting member is fixed to one end of the manifold and the second intake manifold, and the collecting member includes an inlet that is connected to the outlet of each cooling water pipe in the first and second intake manifolds, and an inlet that extends from the radiator. A V-type engine characterized in that it is provided with one outlet to which one common pipe is connected.