Internal-combustion engines – Cooling – With jacketed head and/or cylinder
Reexamination Certificate
1999-09-14
2001-06-12
Wolfe, Willis R. (Department: 3747)
Internal-combustion engines
Cooling
With jacketed head and/or cylinder
Reexamination Certificate
active
06244225
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the advantageous structure of a cooling water passage in a water-cooled in-line type multi-cylinder engine.
2. Description of the Background Art
A cooling structure of a water-cooled in-line type two-cylinder engine is described in Japanese Utility model publication Hei 1-21161. In this example, a collecting passage for the cooling water is provided between both cylinders integrally with the cylinder head, and a thermostat is attached on the outlet of this collective passage.
Moreover, some in-line type multi-cylinder engines such as a four-cylinder engine may have a structure in which both ends of the water outlet side passage provided on another body separate from the cylinder head are communicated to the cylinder side water passage on both ends and joined together on the thermostat section provided on the center section.
Since the piping sections leading to the thermostat will increase if the water outlet side passage is provided outside the cylinder head, it would be preferable to form the water outlet side passage integrally with the cylinder head as shown in the conventional example. However, if this structure is applied to the in-line type four-cylinder engine, the water outlet side passages between cylinders converge on the thermostat section so that the flow of the cooling water is bound to be nonuniform. There is thus a desire to solve this problem in order to improve the cooling performance.
SUMMARY OF THE INVENTION
This invention has a main object to solve such problem. A cooling water outlet for the water jacket which is provided centrally in the array direction of each cylinder on a cylinder head of a multi-cylinder engine. A bulkhead is provided within the water jacket, extending in the array direction of each cylinder to divide the inside into an outlet side and a main body section, so that the cooling water that cooled each cylinder, by flowing along the bulkhead, is collected in one place within the cylinder head on the opposite side of the bulkhead and flows to the cooling water outlet, thereby further simplifying the external water piping.
The bulkhead is formed integrally with the cylinder head so that manufacturing performance is improved since the bulkhead is formed simultaneously when the cylinder head is formed. A case for the thermostat is attached directly on the cooling water outlet, thereby further simplifying the external piping.
The bulkhead extends to a position near the center of a cylinder outside the outlet side and the main body section so that the cooling water is guided to both sides, and then flows to the cooling water outlet side, eliminating stagnation of the cooling water with improved cooling performance.
The cooling water inlet to the cylinder head is formed on the opposite side to the cooling water outlet side and centrally in the array direction of each cylinder. The cooling water inlet to the cylinder head converges at the central section of the opposite side so that the cooling water is uniformly distributed to each cylinder by being guided by the bulkhead, thereby making it possible to uniformly cool each cylinder.
An open hole for venting air is formed on the bulkhead so that the air staying in the water jacket is rapidly discharged to the cooling water outlet side.
A cooling water inlet for the water to flow from the water pump to the water jacket of the cylinder is provided on the same side as the cooling water outlet side. The cooling water inlet to the cylinder is provided in the direction to the central side cylinder of the same side as the cooling water outlet so that the cooling water inlets are concentrated on one side of the engine, thereby making the piping easier.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 4346676 (1982-08-01), Tyner
patent: 2121161 (1989-06-01), None
Inui Hiroatsu
Nakanishi Tetsuya
Takahashi Katsunori
Birch & Stewart Kolasch & Birch, LLP
Harris Katrina B.
Honda Giken Kogyo Kabushiki Kaisha
Wolfe Willis R.
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