# US 8,539,915 B2 · Cooling system for a motor vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,539,915 B2 - Document ID: US8539915B2 - Status: Granted - Kind: B2 - Application number: 12/700,343 - Filed: 2010-02-04 - Published: 2010-08-19 - Granted: 2013-09-24 - Earliest claimed: 2009-02-05 - Assignees: Mahle International GmbH - Applicants: Michael Baumann; Günther Beez; Holger Conrad; Oliver Gebhardt; Rüdiger Knauβ - Inventors: Michael Baumann; Günther Beez; Holger Conrad; Oliver Gebhardt; Rüdiger Knauβ - Web page: https://patentgrep.com/patent/US8539915B2 ## CPC - F01P 7/161: {by bypassing pumps} - F01P 2007/146: {using valves} - F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28) ## Abstract A cooling system for motor vehicle with a cooling circuit, which includes one or more internal combustion engines, a pump and a cooling device, is described herein. The cooling system includes a short circuit line, which bypasses the pump by connecting a pressure side of the pump to an intake side of the pump. The cooling system further includes a valve device in the region of the short circuit line, and the valve device is switched between two or more positions. When the valve is in the first position, the entire coolant flow is directed through the short circuit line. Further, when the valve is in the second position, the entire coolant flow is directed through the internal combustion engine and not through the short circuit line. ## Claims ### Claim 1 A motor vehicle cooling system, comprising: a cooling circuit, wherein the cooling circuit includes at least one internal combustion engine, one pump and one cooling device; a short circuit line, which bypasses the pump, wherein the short circuit line connects a pressure side of the pump to an intake side of the pump; a valve device, which is switched between at least a first position and second position is provided in the region of the short circuit line, wherein switching the valve device to the first position directs at least most of a coolant flow through the short circuit line, and when switching the valve device to the second position the entire coolant flow is directed through the internal combustion engine bypassing the short circuit line; wherein the valve device includes a valve tappet and two valve discs spaced apart in an axial direction on the valve tappet for directing the coolant flow; wherein the valve discs are disposed on opposing ends of the valve tappet; and a spring disposed between one of the valve discs and a valve seat ring for preloading the other of the valve discs into a closed position. ### Claim 2 (depends on 1) Cooling system according to claim 1, wherein a bypass line is provided which bypasses the cooling device. ### Claim 3 (depends on 2) Cooling system according to claim 2, wherein the short circuit line branches off from the cooling circuit downstream of the pump and opens into the cooling circuit upstream of the pump. ### Claim 4 (depends on 2) Cooling system according to claim 2, wherein the valve device is a throttle device. ### Claim 5 (depends on 2) Cooling system according to claim 2, wherein the valve device is actuated by at least one of pneumatically and hydraulically. ### Claim 6 (depends on 2) Cooling system according to claim 2, wherein a thermostat with a thermostat valve device, is arranged in a junction region of the bypass line of the cooling circuit. ### Claim 7 (depends on 1) Cooling system according to claim 1 wherein the short circuit line branches off from the cooling circuit downstream of the pump and opens into the cooling circuit upstream of the pump. ### Claim 8 (depends on 7) Cooling system according to claim 7, wherein the valve device is a throttle device. ### Claim 9 (depends on 7) Cooling system according to claim 7, wherein the valve device is actuated by at least one of pneumatically and hydraulically. ### Claim 10 (depends on 7) Cooling system according to claim 7, wherein a thermostat with a thermostat valve device, is arranged in a junction region of a bypass line of the cooling circuit. ### Claim 11 (depends on 1) Cooling system according to claim 1 wherein the valve device is a throttle device. ### Claim 12 (depends on 11) Cooling system according to claim 11, wherein the valve device is actuated by at least one of pneumatically and hydraulically. ### Claim 13 (depends on 11) Cooling system according to claim 11, wherein a thermostat with a thermostat valve device, is arranged in a junction region of a bypass line of the cooling circuit. ### Claim 14 (depends on 1) Cooling system according to claim 1, wherein the valve device is actuated by at least one of pneumatically and hydraulically. ### Claim 15 (depends on 14) Cooling system according to claim 14, wherein a thermostat with a thermostat valve device, is arranged in a junction region of a bypass line of the cooling circuit. ### Claim 16 (depends on 1) Cooling system according to claim 1, wherein a thermostat with a valve device, is arranged in a junction region of a bypass line of the cooling circuit. ### Claim 17 (depends on 1) Cooling system according to claim 1, wherein the valve device is an annular slide valve. ### Claim 18 (depends on 1) Cooling system according to claim 1, wherein the valve device remains in its second position in an inactive state. ### Claim 19 (depends on 1) Cooling system according to claim 1, wherein the valve device is a proportional valve. ### Claim 20 (depends on 1) Cooling system according to claim 1, wherein the valve device is arranged upstream of the pump. ### Claim 21 (depends on 1) Cooling system according to claim 1, wherein one of the valve discs is configured in one-piece with the valve tappet, and the other of the valve discs is a separate component secured on the valve tappet in an axial direction by a securing element. ### Claim 22 (depends on 1) Cooling system according to claim 1, wherein the two valve discs are disposed on one end portion of the valve tappet and bear closely against a respective one of two valve seats when the valve discs are moved to a respective one of the first and second positions. ### Claim 23 (depends on 1) Cooling system according to claim 1, wherein the spring preloads the other of the valve discs against the valve seat ring.