JPS6018587Y2 - Cooling water seal structure of water-cooled pre-combustion chamber - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pre-combustion chamber of an internal combustion engine, and more particularly to a cooling water seal structure for a water-cooled pre-combustion chamber.

The nozzle hole that communicates the pre-combustion chamber with the main combustion chamber of an internal combustion engine is exposed to extremely high temperatures during engine operation.
Conventionally, special consideration has been given to the material of this part, but the edges of the nozzle hole often suffer melt damage, resulting in extreme deterioration of engine performance.

In order to solve this drawback, the applicant devised a water-cooled precombustion chamber in which cooling water is introduced around the nozzle hole of the precombustion chamber to directly cool the precombustion chamber itself. The invention relates to a sealing structure for the cooling water passage of such a water-cooled precombustion chamber. In other words, the cooling water sealing structure for the water-cooled precombustion chamber of the invention relates to a sealing structure for the cooling water passage of the water-cooled precombustion chamber. A front chamber 1 having a hole 5 in the front wall, and a rear chamber 3 connected to the front chamber 1.
Therefore, in a water-cooled precombustion chamber in which a cooling water passage 8 is bored in the front chamber 1 surrounding the nozzle hole 5, the inlet 9 and the discharge opening 16 of the cooling water passage 8 are connected to the front chamber 1. Annular grooves 17 and 18 are perpendicularly perpendicular to the outer circumferential wall surface 15 of the inlet 9 and the outlet 16, and annular grooves 17 and 18 for fitting the sealing material are formed concentrically around the openings of the inlet 9 and the outlet 16, spaced apart from these openings. This is characterized in that the pre-combustion chamber is attached to the cylinder head 6 by inserting an annular sealing material 14 into the grooves 17 and 18, respectively.

Next, embodiments of the present invention will be described with reference to figures.

In FIG. 1, reference numeral 1 denotes a front chamber constituting a pre-combustion chamber 2, and a rear chamber 3 is connected to the front chamber 1.

A nozzle hole 5 is bored in the front wall of the front chamber 1 to communicate the pre-combustion chamber 5 and the main combustion chamber 4 .

The pre-combustion chamber 2 is supported by the cylinder head 6, and the main combustion chamber 4 is formed between the top of the piston 7 and the cylinder head 6.

A cooling water passage 8 is bored in the front chamber 1 surrounding the nozzle hole 5, and the cooling water inlet 9 thereof is opened toward the flow direction (upstream side) of the cooling water passage 10 of the cylinder head. do.

In FIG. 1, 11 is a cylinder head, 12 is a cylinder block, 13 is a cooling water main gallery, arrows indicate the flow direction of cooling water, and 14 is a sealing material (described in detail later).

The cooling water passage 8 formed in the pre-combustion chamber front chamber 1 is formed by precision casting using a ceramic core, or by separately manufacturing the main body and the outer wall surface, and forming the cooling water passage between them. It is manufactured by forming a pre-combustion chamber by welding and joining.

2 to 4, a cooling water passage 8 formed in the front chamber 1 is provided with a cooling water inlet 9 and an outlet 16 perpendicular to the outer peripheral wall surface 15 of the front chamber 1. As shown in FIGS.

The outer circumferential wall surface 15 of the front chamber 1 has a vertical or slightly tapered shape, similar to the conventional one.

Around the openings of the inlet 9 and the outlet 16 on the outer peripheral wall surface 15, annular grooves 17 and 18 are provided for fitting a sealing material.
are concentrically drilled at intervals from these openings.

A sealing material or packing 14, which will be described later, is fitted into these grooves 17 and 18.

As for the packing, it is suitable to use, for example, a spiral packing made of carbon material 20 backed up by an elastic heat-resistant metal plate 19, as shown in FIG. Trademark) material coated is suitable.

The cooling water seal structure of the water-cooled pre-combustion chamber of the present invention is constructed as described above, with grooves 17.
8 are bored respectively, and an annular sealing material 1 is inserted into these grooves 17 and 18.
4, the sealing material 14 is inserted into the groove 17,
18, it can be supported reliably.

Therefore, when fitting the pre-combustion chamber to the cylinder head 6,
There is no risk of deformation such as distortion or twisting in each sealing material 14, and by fitting and supporting the cylinder head 6, the water-cooled precombustion chamber can be held in the cylinder head in a waterproof manner.

As described above, the cooling water seal structure of the water-cooled precombustion chamber of the present invention has a simple structure but can be made completely water-resistant. The function of the water-cooled pre-combustion chamber, which can effectively cool the parts, can be made even more effective.
The practical effects of the present invention are extremely remarkable.

[Brief explanation of the drawing]

Fig. 1 is a (partial) side sectional view of an internal combustion engine having a cooling water seal structure for the water-cooled precombustion chamber of the present invention, Fig. 2 is a side sectional view of the water-cooled precombustion chamber, and Fig. 3 is Fig. 2. FIG. 4 is a side view of the water-cooled precombustion chamber, and FIG. 5 is a side sectional view of the packing. 1... Front chamber, 2... Pre-combustion chamber, 3...
...Rear chamber, 4...Main combustion chamber, 5...
・Nozzle hole, 6...Cylinder head, 7...
Zeston, 8...Cooling water passage, 9...
Inflow port, 10... Cooling water passage in cylinder head, 14... Seal material (packet), 15...
...Outer peripheral wall surface of front chamber, 16...Discharge port, 1
7.18...groove.

Claims (1)

[Scope of utility model registration request] It consists of a front chamber 1 which has nozzle holes 5 in the front wall that communicate with the main combustion chamber 4 of the internal combustion engine, and a rear chamber 3 connected to this, and the front chamber 1 has cooling water surrounding the nozzle holes 5. In a water-cooled precombustion chamber in which a passage 8 is bored, an inlet 9 and an outlet 16 of the cooling water passage 8 are bored perpendicularly to the outer peripheral wall surface 15 of the front chamber 1, and the inlet 9 and outlet 16, annular grooves 17 and 18 for fitting the sealing material are formed concentrically at intervals with these openings, and the annular sealing material 14 is inserted into these grooves 17 and 18. Insert the pre-combustion chamber into the cylinder head 6
A cooling water seal structure for a water-cooled pre-combustion chamber that is installed in a water-cooled pre-combustion chamber.