JPS6215466Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooling water circulation system for a horizontal water-cooled engine.

In cooling this type of engine, it is necessary to have a flow of cooling water that most efficiently removes the amount of heat generated around the auxiliary combustion chamber 12 and the main combustion chamber 13 shown in FIGS. 1 and 3. In particular, it is structurally difficult for the sub-combustion chamber 12 to have a sufficient cooling water passage area, so it is necessary to flow cooling water with a correspondingly large cooling capacity, that is, as low temperature as possible. The present invention is a device that efficiently cools these combustion chambers, and its gist is that a cooler is provided in the upper part of the crankcase and has horizontal water passages with different flow directions at the top and bottom, a cylinder liner, The cylinder head and the jacket formed by the crankcase are connected by water hoses between the uppermost part of the crankcase and the lower part of the cooler, and between the upper part of the cooler and the cylinder head or the lower part of the crankcase.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing the structure of an engine cooling system according to the present invention, and FIG. 2 is a partially sectional side view thereof.

1 and 2, a horizontal two-pass water passage group cooler 2 having an upper water passage and a lower water passage mounted on the upper part of the crankcase 1 is shown. In order to connect the cylinder liner 16, the cylinder head 3, and the jacket part 4 formed by the crankcase 1, the crankcase top 5 and the cooler lower part 8 are connected by a water hose 11, and the cooler upper part 7 and The cylinder head lower part 9 or the crankcase lower part 6 is connected by a water hose 10.

In addition, in FIG. 1, 14 is the jacket portion 4.
15 is the sand tank of the cooler, 16 is the cylinder liner, 17 is the piston, 18 is the connecting rod, 19 is the tappet hole (same as in Figure 2)
These are long holes in the tapepet and bush rod (not shown).

Note that the mesh portion in FIG. 2 indicates the head bolt boss and the pre-combustion chamber suction/discharge boat portion.

Therefore, the cooling water cooled by the cooler 2 and led to the lower part 9 of the cylinder head of the jacket part 4 by the water hose 10 cools the auxiliary combustion chamber 12, is heated, and rises as a flow of cooling water. The cylinder liner 1 is sprayed as another flow of water to the cylinder liner 16 side of the crankcase 1.
6 and rose following the cooling water in the above-mentioned cooling water flow to cool these sub-combustion chambers 12, and also spouted to the cylinder liner 16 side of the crankcase 1 to cool the cylinder liner. The cooling water further rises because it contains steam, and flows from the top part 5 of the crankcase through the water hose 11 to the lower part 8 of the cooler. The cooled water is cooled in the pass water passage group and flows from the upper part 7 of the cooler to the lower part 9 of the cylinder head via the water hose 10. A cooling cycle is created that circulates cooling water by utilizing the natural convection that occurs due to the difference in temperature. In the figure, solid line arrows indicate the flow direction of cooling water for cooling the auxiliary combustion chamber 12, and broken line arrows indicate the flow direction of cooling water for cooling the cylinder liner 16 of the main combustion chamber 13.

Therefore, as the cooling water that has cooled the auxiliary combustion chamber 12 flows upward to the uppermost part of the crankcase 5, the cooling water jetted out toward the cylinder liner 16 side of the crankcase 1 flows along the cylinder liner 16 to cool the main combustion chamber 13. The cooling water for cooling the auxiliary combustion chamber has a flow that flows upward and flows upward, and these flows merge and rise to the top part 5 of the crankcase to form the main combustion chamber.
This is a cooling cycle that flows to cool the sub-combustion chambers 13 and 12.

In the above two cooling cycles, the main and sub-combustion chambers 13 and 12 are cooled, but in order to increase the cooling effect, the low-temperature cooling water that is cooled by the cooler 2 and descends is sent to the sub-combustion chamber 12 and the main combustion chamber 13. It is necessary to send it as soon as possible, and the above configuration satisfies this requirement.

In FIG. 3, the hole A from the cylinder head 9 to the crankcase 6 is closed, and the cooling of both the main and auxiliary combustion chambers 13 and 12 is divided.

Next, as shown in FIGS. 4 and 5, the jacket part 4 is
The reinforcing rib 20 will be described.

In horizontal water-cooled engines, there are many cases in which the jacket portion is opened in order to directly attach the cooler 2 onto the crankcase 1, and for this reason, the cylinder liner 1
There is no wall above the crankcase 1, and a window is provided as a mounting surface for the cooler 2. Therefore, on the upper side of the cylinder liner 16, the B section as shown in FIG. 5 is smaller than the other circumferential portions of the cylinder liner 16 in terms of rigidity in the P direction in FIG. is bringing about.

Therefore, a reinforcing rib 20 extending from section B on the upper surface of the crankcase is provided as shown in FIG. The passage to the cooling water cooler is provided by providing a hole above or in the lateral direction of the crankcase top ₅ within approximately 1/3 range _L2 of the cooling water contact length L1 of the cylinder liner, and connecting it to the cooler 2. A water hose 11 communicates between the two.

By adopting the engine cooling device according to the present invention, the efficiency of the cooling water can be increased, and therefore the durability of the engine is also increased without reducing the engine output.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view showing the configuration of the engine cooling system of the present invention, Fig. 2 is a left side view partially cut away, Fig. 3 is a schematic cross-sectional view of the cylinder head, and Fig. 4 is a rib FIG. 5 is a left side view of the cylinder head. 1...Crankcase, 2...Cooler, 3...
Cylinder head, 4... Jacket part, 5... Top of crankcase, 6... Lower part of crankcase, 7... Upper part of cooler, 8... Lower part of cooler, 9...
... lower part of cylinder head, 10 ... water hose, 11 ... water hose, 12 ... auxiliary combustion chamber, 13 ... main combustion chamber, 20 ... reinforcing rib.

Claims (1)

[Scope of utility model registration request] In a cooling system for a horizontal water-cooled engine, a cooler is provided in the upper part of a crankcase and has horizontal water passages with different flow directions at the top and bottom, and a jacket part formed by a cylinder liner, a cylinder head, and a crankcase. An engine cooling system characterized by connecting the top of the case and the bottom of the cooler, and the top of the cooler and the bottom of the cylinder head or crankcase with water hoses.