Internal-combustion engines – Cooling – With jacketed head and/or cylinder
Utility Patent
1999-08-09
2001-01-02
Wolfe, Willis R. (Department: 3747)
Internal-combustion engines
Cooling
With jacketed head and/or cylinder
C123S04182R
Utility Patent
active
06167848
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention resides in a multi-cylinder water-cooled internal combustion engine with individual cylinder heads and individual cylinder sleeves and cooling water spaces formed around the cylinder sleeves to which cooling water is supplied by a supply passage supplying cooling water also to the cylinder head.
Such engines have been used in large numbers as Diesel drive units for commercial vehicles. However, further developments of such engines providing for increased power output causes increased thermal loads on such engines particularly if chargers are used to increase the engine power output. As a result, the engine may become thermally overloaded in critical areas. A particularly high thermal load occurs in the connecting areas between the cylinder head and the engine block, particularly the removable cylinder sleeves disposed in the engine block. At their ends adjacent the cylinder head, the cylinder sleeves have radially projecting shoulders which detrimentally affect the cooling of the top ends of the cylinder sleeves where they are subjected to the highest thermal load.
U.S. Pat. No. 5,596,954 discloses a water cooled Diesel engine, wherein the problem is addressed by providing, adjacent the shoulders of the cylinder sleeves, a narrow separate annular cooling water channel, which is in communication with the cooling water space around the cylinder sleeve by a communication passage formed in an annular flange defining the annular cooling water channel. To form the communication passage, the annular flange is cut tangentially on sides disposed opposite each other with resect to the direction of the longitudinal axis of the engine block, that is, adjacent the respective neighboring cylinder. The cooling water is supplied from the engine block to the cylinder head by supply passages which are disposed opposite each other with respect to the longitudinal axis of the engine block and which extend from an intermediate axial area of the cooling water space around the cylinder sleeves.
The annular cooling water channel is in communication with the supply passage by way of discharge bores so that the coolant can flow from the intermediate axial area of the cooling water space also through the annular cooling water channel to the supply passage. In order to obtain with such an arrangement sufficient coolant flow through the annular cooling water channel the cross-section of the opening leading to the supply passage is substantially smaller than the cross-section of the supply passage. As a result, the flow increase through the annular channel and the control of the cooling capability obtained thereby is quite limited.
SUMMARY OF THE INVENTION
In a water-cooled internal combustion engine with a cooling water path extending from a supply passage at one side of the engine through the cooling water spaces around the engine cylinder to the cylinder head and back to a cooling water return channel at the other side of the engine, a separate annular cooling water channel extends around each cylinder adjacent the combustion chamber and this annular cooling water channel is supplied by cooling water in a flow path parallel to the flow path through the cylinder head so as to provide for adequate cooling of the cylinders adjacent the combustion chambers.
With this arrangement, a pressure differential between the inlet to the annular channel and its outlet is generated by the pressure losses to which the cooling water is subjected in its passage through the cylinder head. This pressure differential is utilized to generate a fast cooling water flow through the annular channel around the cylinder sleeves adjacent the cylinder head as the annular channel forms essentially a throttled by-pass flow path parallel to the cooling water flow through the cylinder head. In this way, a high cooling capability is obtained if this is required. Also, a good control of the cooling water flow through the annular passage can be achieved with little efforts, for example, simply by an appropriate selection of the cross-section of the cooling water supply and/or discharge openings of the annular coolant channel.
The invention will become more readily apparent from the following description of a preferred embodiment thereof on the basis of the accompanying drawings.
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Bach Klaus J.
Daimler-Chrysler AG
Harris Katrina B.
Wolfe Willis R.
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