JP2667012B2 - Engine air cooler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention cools the supply air compressed and heated by the supercharger when a supercharger is attached to the engine to form a high-power engine. The present invention relates to an air cooler supplied to a cylinder head.

(B) Prior art A description will be given based on the prior art drawings shown in FIGS. 4, 5 and 6. FIG.

FIG. 4 is a side view of an engine provided with a conventional air cooler, FIG. 5 is a drawing showing a temperature distribution in a black frame portion in FIG. 4, and FIG. 6 is a cross-sectional view of the conventional air cooler. .

When the compressed air of high temperature compressed by the supercharger is sent to the air cooler attached to the side of the engine, this hot air consists of the cooling water pipe (26) and the cooling fin (27) from the hot air supply duct. It is pumped to pass through the cooling core (C), but since the cooling core (C) has a large air resistance, the side member (2
1) Since air tends to pass between (22) and the outer end face of the cooling core (C), and the air passing through the low resistance portion remains at a high temperature, as shown in FIG. 4 and FIG. In the side members (21) and (22), the portion of the side member (21) closest to the supply port from the turbocharger to the high-temperature air supply duct (23) becomes particularly hot. It was.

For this reason, a high temperature portion (H) is formed in the side members (21) and (22), and when the high temperature portion (H) expands,
The side members (21) (22) push the tube plates before and after the expansion and fixation of the cooling water pipes (26) forward and backward so that the temperature is low due to the passage of cooling water inside. In the unexpanded cooling water pipe and the expanded pipe fixing part of the tube sheet,
This caused a problem that the cooling water pipe was broken.

In addition, this thermal deformation causes sagging of the packing interposed between the joints, causing a problem that sealing performance is reduced and air leakage occurs.

In addition, the water leakage prevention packing interposed between the tube sheet and the front water tank or the rear water tank was adversely affected.

Also, there was a problem that the side members would become too hot to use materials with a high coefficient of thermal expansion such as aluminum.

In order to solve the above problems of the engine air cooler, a technique in which a heat insulating material is interposed between the cooling core and the side member is disclosed in Japanese Utility Model Laid-Open No. 56-11325 and Japanese Patent Laid-Open No. 61-325.
It is known as in -72832, but when a heat insulating material is interposed between the cooling core and the side member as described above, it is possible to suppress the temperature rise of the portion. However, it is necessary to make the heat insulating material considerably thicker or to select a material having a very small heat transfer coefficient, which is difficult to realize from the viewpoint of compactness, productivity and technology.

(C) Problems to be Solved by the Invention The present invention is a further improvement of the conventional technology, and is not a troublesome configuration in which a heat insulating material is interposed, but a heat shield plate between a cooling core and a side member. By arranging, an air layer is provided between the two, and the air layer is not simply an air layer,
A passage is provided to allow the supply of cooled air to pass through the cooling core, and the cooling air can cool the side member to be heated.

 As a result, the above-mentioned conventional problem is solved.

(D) Means for Solving the Problems The object of the present invention is as described above, and a configuration for achieving the object will be described below.

A cooling core (C) is constituted by the front and rear tube sheets (28) and (29), the cooling water pipe (26), and the cooling fins (27). Side member (1)
(2) is fitted, and a front water tank (8) and a rear water tank (9) are fixed at front and rear positions of the front and rear tube sheets (28) and (29), and the front water tank (8) is fixed. And an air cooler for an engine in which a high temperature air supply duct (3) and a cooling air supply duct (4) are attached to the upper and lower positions of a rectangular tube formed by a rear water tank (9) and side members (1) and (2), Between the cooling core (C) and the side members (1) and (2), the flow of intake air from the high-temperature air supply duct (3) is prevented, and between the cooling core (C) and the side members (1) and (2). The heat shield plates (5) and (7) for forming the air layer (A) are arranged in the air gap, and the air layer (A) is formed between the heat shield plates (5) and (7) and the side members (1) and (2). The heat shield plates (5) and (7) are closed at their upper ends, and the air layer (A) is closed.
And an intake passage of the cooling air supply duct (4).

(E) Embodiment The purpose and configuration of the present invention are as described above. Next, the configuration of the embodiment shown in the attached drawings will be described.

FIG. 1 is a side view of an air cooler of an engine of the present invention, FIG. 2 is a perspective view of an air cooler in an exploded state, and FIG. 3 is a cross-sectional view.

In FIG. 1, an air cooler is provided on a side surface of a cylinder block of an engine, and a hot air supply duct (3) is supplied from a supercharger (15) arranged at the other end of the engine.
Has been introduced through.

In the air cooler, the supply air cooled while passing through the cooling core (C) passes through the cooling air supply duct (4) and is supplied into the cylinder head.

Then, the supercharger (15) is rotated by the gas after combustion in the cylinder head to supply and compress the air supply. However, since the air becomes high temperature in the process of compressing the air supply, it is further cooled. By pushing it in as low-temperature air, a high-supercharged engine can be obtained.

The air cooler is provided with a front water tank (8) and a rear water tank (9) before and after the cooling core (C), and at the side of the cooling core (C), with the front water tank (8). Side members (1) and (2) are fitted between the rear water tank (9).

Then, a high-temperature air supply duct (3) and a cooling air supply duct (4) are provided above and below a rectangular tube constituted by a front water tank (8), a rear water tank (9), and side members (1) and (2). It is doing.

The cooling water is supplied from a front water tank (8), and is discharged from a rear water tank (9) after passing through a cooling water pipe (6) constituting a cooling core (C). Further, the supercharged air is cooled from the supercharger (15) through the high-temperature cooling supply duct (3) and passed between the cooling cores (C), and is pressure-fed into the cylinder head from the cooling air supply duct (4). It is done.

Next, a specific configuration of the air cooler of the engine of the present invention will be described with reference to FIGS.

The cooling core (C) includes a plurality of cooling water pipes (6), cooling fins (30), front and rear tube sheets (28) and (29), and a central core stay (14). The core stay (14) is also formed of a single thick plate, and the cooling water pipe (6) is arranged to penetrate through a large number of holes opened in the core stay (14).

Bolts (16) are screwed into screw holes provided in the side surfaces of the core stay (14), and the front and rear central portions of the side members (1) and (2) are fixed to the core stay (14).

When fixing the side members (1) and (2) to the core stay (14), the heat shield plates (5) and (7), which are essential parts of the present invention, are interposed therebetween and fixed.

Further, the cooling water pipe (6) is provided in the holes formed in the front and rear tube sheets (28) and (29) by increasing the diameter of the inside or the pipe sheet (28) and (29). It is fixed by pushing the expanded part into the groove.

Therefore, when the side members (1) and (2) become hot portions (H) and expand in particular, the side members (1) and (2) push the tube sheets (28) and (29) back and forth, so that cooling water is formed inside. Since the cooling water pipe (6) has a low temperature and does not expand due to the passage, the cooling water pipe (6) is cut off at the expanded and fixed portion of the pipe sheets (28) and (29). .

A water tank packing (12) is interposed between the tube sheet (28) and the front water tank (8), and a water tank packing (13) is provided between the tube sheet (29) and the rear water tank (9). ) Is interposed.

A bolt (33) fitted between the front water tank (8) and the rear water tank (9) and inserted from the front surface of the front water tank (8) and the rear surface of the rear water tank (9). The side members (1) and (2) fixed by)
Air seal packings (18) and (19) are interposed between (29) and (29) so that the air supplied from the high-temperature air supply duct (3) is not leaked.

Also, between the left and right side members (1) and (2),
The rod-shaped distance piece (10) (10) (11) (11) is interposed, and the distance piece (10) (10)
(11) Bolts (17) (17) from the outside of the side members (1) (2) into the screw holes provided at the ends of (11)
... is screwed.

This bolt (17) and distance piece (10) (10)
(11) According to (11), left and right side members (1)
The fixed spacing is maintained while keeping the interval (2) constant. The bolt (17) also penetrates the heat shield plates (5) and (7).

Next, the arrangement of the heat shield plates (5) and (7) will be described with reference to FIG.

The heat shield plates (5) and (7) are bent at the upper end (5a).
(7a), and this part is the side member (1)
It is sandwiched and fixed between (2) and the hot air supply duct (3).

In addition, since there is a portion of the sandwiching bent portion (5a) (7a),
High-temperature air cannot pass through the air layer (A) formed between the heat shield plates (5) and (7) and the side members (1) and (2) on the back side.

However, the lower ends (5b) of the heat shield plates (5) and (7)
(7b) is configured as a straight portion, and is not sandwiched between the side members (1) and (2) and the cooling air supply duct (4).

Therefore, a gap is opened between the lower members (5b) and (7b) and the side members (1) and (2), and the supply air cooled through the cooling core (C) is supplied to the lower members. (Five
b) It is possible to penetrate into the air layer (A) from the opening constituted by (7b).

Especially, since the intake air to the cylinder head is carried out in order, the flow of the supply air in the portion of the cooling air supply duct (4) generates a back and forth flow, and this front and back flow is the air layer (A). Air flow (A)
Can be kept at a low temperature.

(F) Effects of the Invention The present invention is configured as described above, and has the following effects.

First, cooling core (C) and side member (1)
By arranging the heat shield plates (5) and (7) during (2), the side members (1) and (2) are not exposed to the intake air from the high-temperature supercharger (15), and the side members (1) and (2) are not exposed. (1) The thermal expansion of (2) could be suppressed.

Secondly, between the side members (1) (2) and the heat shield plates (5) (7), the sandwiched bent portions (5a) (7a) are provided.
Stops the flow of high temperature air from the high temperature air supply duct (3), and cools it from the lower ends (5b) and (7b) of the heat shield plates (5) and (7) after passing through the cooling core (C). The temperature of the air layer (A) can be lowered by enabling the taken-in air to be introduced into the air layer (A), and the high temperature of the side members (1) and (2) can be suppressed. is there.

Third, the heat shield plate (5) is simply changed without changing the configuration and component formation of the conventional air cooler of the engine.
(7) Replace cooling core (C) with side members (1) (2)
It is possible to reliably suppress the temperature rise of the side members (1) and (2) with a simple structure only by interposing between them.

[Brief description of the drawings]

FIG. 1 is a side view of an air cooler of an engine according to the present invention.
FIG. 3 is a perspective view of the disassembled state of the air cooler, FIG. 3 is a cross-sectional view, FIG. 4 is a side view of an engine provided with a conventional air cooler, and FIG. 5 is a temperature distribution of a black frame portion in FIG. FIG. 6 is a cross-sectional view of a conventional air cooler. (A) Air layer (C) Cooling core (1) (2) Side member (3) Hot air supply duct (4) Cooling air supply duct (5) (7) Heat shield plate (5a) (7a)… nipping and bending part (5b) (7b)… bottom part (6)… cooling water pipe (8)… front water tank (9)… rear water tank

Claims (1)

(57) [Claims] 1. A cooling core is constituted by front and rear tube sheets, cooling water tubes and cooling fins, side members are fitted on left and right between the front and rear tube sheets, and front and rear portions are provided at front and rear positions of the front and rear tube sheets. An air cooler for an engine, in which a water tank and a rear water tank are fixedly installed, and a high temperature air supply duct and a cooling air supply duct are provided above and below a rectangular tube constituted by the front water tank, the rear water tank and side members. A heat shield plate that blocks the flow of intake air from the high-temperature air supply duct and forms an air layer between the cooling core and the side member, is disposed between the cooling core and the side member; An air cooler for an engine, wherein an air layer is formed between members, an upper end of the heat shield plate is closed, and the air layer communicates with an intake passage of a cooling air supply duct.