JPH0343381Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention provides a supercharger for pressurizing supply air to an engine and an air cooler for cooling the supply air sent from the supercharger. The present invention relates to an improvement in an air supply system for an internal combustion engine equipped with the following.

[Prior Art] A conventional air supply system for an internal combustion engine equipped with a supercharger and an air cooler has a structure in which the air cooler is completely built into the cylinder column as shown in Fig. 3a and b. There are known devices in which the air cooler is placed horizontally and the air passage from the supercharger is installed outside the cylinder column.

[Problem to be solved by the invention] In the former air supply system, for cleaning the air cooler, or for maintenance when the pipe body or pipe end of the air cooler is damaged or the header is corroded, It is necessary to remove the air cooler from within the cylinder column and disassemble and assemble the air cooler, but this work is complicated and difficult. Furthermore, even if an attempt is made to install equipment with different specifications, such as a heater cooler, in order to improve performance during low-load operation, for example, there is limited space in the cylinder column to install the equipment, so such new specifications cannot be accommodated. There was also the problem of not being able to respond immediately. In addition, in the case of a built-in type,
There is also a problem in that a bypass phenomenon may occur between the cylinder column inner wall and the air cooler inside the cylinder column, resulting in a reduction in cooling efficiency.

Next, the latter air supply system had the problem that the overall width of the engine was increased because the air cooler was placed on the side.

In both types of air supply devices, the piping becomes larger and more complicated, and the air chamber becomes smaller, which results in uneven air flow and higher pressure loss, which reduces performance accordingly. There was a problem with the decrease.

[Means for Solving the Problems] An air supply system for an internal combustion engine according to the present invention includes a lower air supply chamber communicating with the turbocharger and an air supply system for an internal combustion engine equipped with a supercharger and an air cooler. An upper air supply chamber that communicates with each cylinder is provided in a cylinder column independently of each other, and an air cooler consisting of an upper cooler and a lower cooler that communicate with each other is attached to the cylinder column, and the lower air supply chamber and the It is characterized in that the lower cooler is communicated with the upper air supply chamber, and the upper cooler and the upper air supply chamber are communicated with each other.

[Operation] Air sent from the supercharger enters the air cooler outside the cylinder column from the lower air supply chamber of the cylinder column. This air is cooled from the lower cooler via the upper cooler and enters the upper air supply chamber in the cylinder column, from where it is supplied to each cylinder of the internal combustion engine.

[Example] An example of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, inside a cylinder column 1 of this internal combustion engine, an upper air supply chamber 2 and a lower air supply chamber 3, which are independent from each other, are vertically arranged. The lower air supply chamber 3 communicates with a supercharger (not shown), and compressed air is fed thereto. The upper air supply chamber 2 opens at a plurality of locations on the upper surface of the cylinder column 1, and is connected and communicated with each cylinder of the internal combustion engine through short air supply pipes (not shown). Further, these upper and lower air supply chambers 2 and 3 are respectively opened on the side surface of the cylinder column 1, and an air cooler 4 is provided on the side surface of the cylinder column 1. The chambers 2 and 3 are communicated via this air cooler 4. That is, the air cooler 4 is configured into two upper and lower stages, including a lower cooler 4a communicating with the lower air supply chamber 3 and an upper cooler 4b communicating with the upper air supply chamber 2. A duct 5 is installed between the upper and lower coolers 4a and 4b to guide air.
The cooling water (for example, seawater) supplied into the lower cooler 4a is communicated with the upper cooler 4b.
They are starting to return to the outside world.

That is, the upper and lower two-stage air cooler 4 adopted in this embodiment is obtained by dividing the conventional air cooler schematically shown in FIG. 2b into two parts A and B along the broken line.
As shown in FIG. 5A, part B is stacked on top of part A to form a thin structure, and air from the supercharger is guided from the lower stage to the upper stage for cooling as shown by the arrow. In the case of this embodiment, as shown in FIG. 1, by setting the horizontal length L large, the thickness T and height H can be reduced, and the overall shape can be improved without deteriorating the cooling performance. It is compact and thin.

In the above configuration, air sent from the supercharger enters the lower air supply chamber 3 of the cylinder column 1, and directly enters the lower cooler 4a of the air cooler 4 directly attached to the cylinder column 1 without going through any piping. be guided. This air is sent from the lower cooler 4a through the duct 5 to the upper cooler 4b and is cooled. The air then enters the upper air supply chamber 2 of the cylinder column 1 and is sent to each cylinder. During this time, the air is not subjected to a large pressure loss due to the air piping, unlike in the conventional case. Further, according to this embodiment, since the compact air cooler 4 having a small thickness T and height H is used as described above, the overall width can be made smaller compared to the conventional horizontal heating method. In addition, compared to conventional built-in air coolers, the upper and lower air supply chambers 2 and 3 formed within the cylinder column 1 can be set much larger, which eliminates the bypass problem that has traditionally been a problem with built-in air coolers. There is no longer a need to consider phenomena, and the overall configuration can be made much more compact. In addition, air cooler 4
Since it is directly attached to the outside of the cylinder column 1, it is easy to attach and remove it for maintenance. Furthermore, it is also possible to easily install equipment with other specifications such as the aforementioned heater cooler.

[Effects of the invention] The air supply system for an internal combustion engine according to the present invention has upper and lower air supply chambers inside a cylinder column, and an air cooler consisting of two upper and lower stages of coolers outside the cylinder column. It is configured such that the air sent to the lower air supply chamber is cooled by a lower cooler and an upper cooler and then guided to the upper air supply chamber. Therefore, according to the present invention, the following effects can be obtained.

(1) It becomes easier to install and remove the air cooler for maintenance work such as cleaning.

(2) The air cooler is directly attached to the cylinder column, eliminating the need for air piping, eliminating pressure drop, and improving the reliability of the entire device.

(3) Equipment with different specifications can be easily installed in place of the external air cooler.

[Brief explanation of the drawing]

Figure 1a is a perspective view of a cylinder column having an embodiment of the present invention, Figure 1b is a sectional view of the same cylinder column, Figure 2a is a schematic structural diagram of an air cooler in this embodiment, Figure b is a schematic structural diagram showing an example of a conventional air cooler, Figure 3a is a perspective view showing an example of a conventional air supply device in which an air cooler is built into a cylinder column, and Figure 3b is a diagram of the same figure. FIG. 1...Cylinder column, 2...Upper air supply chamber, 3
...Lower air supply chamber, 4...Air cooler, 4a...Lower cooler, 4b...Upper cooler.

Claims (1)

[Scope of utility model registration request] In an air supply system for an internal combustion engine equipped with a supercharger and an air cooler, a lower air supply chamber communicating with the supercharger and an upper air supply chamber communicating with each cylinder are provided in a cylinder column independently of each other, An air cooler consisting of an upper cooler and a lower cooler that communicate with each other is attached to the cylinder column, so that the lower air supply chamber and the lower cooler communicate with each other, and the upper cooler and the upper air supply chamber communicate with each other. An air supply system for an internal combustion engine characterized by: