Cooling circuit for a liquid-cooled internal combustion engine
AssigneeMan Truck & Bus AG
InventorMartin Böhm
Life of this patent
Estimating the term…
Abstract
A cooling circuit for a liquid-cooled internal combustion engine for motor vehicles, includes a main cooling circuit including a feed line leading to a radiator and a return line, and a bypass line, which bypasses the radiator and can be controlled as a function of temperature and secondary cooling circuit for a retarder of a braking device of the motor vehicle, which is connected, likewise by a feed line, a return line and a control valve, to the main cooling circuit. The two cooling circuits (2, 3) can be controlled by a single rotary slide valve (10). Both cooling circuits (2, 3) are interconnected in such a way that the flow rates thereof to the radiator (6) and/or to the retarder (4) can be varied in a predetermined or defined manner, in particular between 0% and 100%.
Claims20
A cooling circuit for a liquid-cooled internal combustion engine for a motor vehicle comprising:
- a main cooling circuit (2) including a radiator (6);
- a feed line (5) leading to said radiator (6);
- and a return line (7) leading away from said radiator (6);
- a bypass line (9) bypassing said radiator (6) and constructed so as to be controllable as a function of predetermined parameters;
- a retarder (4) of a braking device;
- a secondary cooling circuit (3) for said retarder (4), said secondary cooling circuit (3) having a feed line (11) and a return line (12);
- said main cooling circuit (2) having a flow rate to said radiator (6) and said secondary cooling circuit (3) having a flow rate to said retarder (4);
- a single rotary slide valve (10) arranged for controlling said main cooling circuit (2) and said secondary cooling circuit (3);
- said main cooling circuit (2) and said secondary cooling circuit (3) being interconnected for varying at least one of the flow rate to said radiator (6) and the flow rate to said retarder (4) in a defined manner;
- wherein said rotary slide valve (10) comprises a housing (10a) having four throughflow openings therein and being inserted into said feed line (5) leading from the internal combustion engine to said radiator (6);
- said bypass line (9) being connected to a third throughflow opening of said rotary slide valve between said feed line (5) and said return line (12);
- said return line (12) of said retarder (4) connected to a fourth throughflow opening (15);
- and wherein said feed line (11) of said retarder (4) is connected to said feed line (5a) of said main cooling circuit (3) upstream of said rotary slide valve (10);
- and
- wherein three of said four throughflow openings are arranged radially on said housing (10a) of said rotary slide valve (10);
- said rotary slide valve further comprising a crescent-shaped rotary slide (10b);
- said fourth throughflow opening (15) for said return line (12) of said retarder (4) being aligned axially with respect to said rotary slide (10b) and being permanently open;
- and wherein said housing, said rotary slide and said three radial throughflow openings are constructed so as to permit a least the simultaneous partial opening of all three radially arranged throughflow openings.
Dependencies are inferred from the claim text.