초록 ▼

A bypass valve for blocking oil flow through a radiator from a transmission with low oil temperatures includes an oil supply from the radiator, an oil supply, via a bypass line, an oil outlet and a valve unit arranged inside the valve housing. The valve unit includes a compression spring and a heat

A bypass valve for blocking oil flow through a radiator from a transmission with low oil temperatures includes an oil supply from the radiator, an oil supply, via a bypass line, an oil outlet and a valve unit arranged inside the valve housing. The valve unit includes a compression spring and a heat sensitive element, which move depending on the oil temperature such that when the temperature falls below a threshold value, the oil supply from the radiator is closed and the supply, via a bypass line, is opened. When the oil temperature rises above the threshold value, the oil supply from the radiator is opened and the supply, via the bypass line, is closed. The valve unit can be axially moved against the force of the compression spring, when a predefined oil pressure is reached, thus opening the supply, via the bypass line.

대표청구항 ▼

The invention claimed is: 1. A bypass valve (1) for uncoupling oil flow through a radiator at low oil temperatures, with an oil supply (6) from the radiator (7), a supply (4) via a bypass line (5), an oil outlet (8), and a valve unit being displaceable inside a valve housing (10) against a force of

The invention claimed is: 1. A bypass valve (1) for uncoupling oil flow through a radiator at low oil temperatures, with an oil supply (6) from the radiator (7), a supply (4) via a bypass line (5), an oil outlet (8), and a valve unit being displaceable inside a valve housing (10) against a force of a compression spring (11) that is connected in series, the bypass valve (1) comprising a heat sensitive element (2) that moves inside the valve housing (10) subject to an oil temperature such that, at oil temperatures below a threshold value, the oil supply (6) from the radiator (7) is closed and the supply (4), via a bypass line (5), is opened as a result of which, at temperatures above the threshold value, the oil supply (6) from the radiator (7) is opened and the supply (4), via the bypass line (5), is closed resulting in that, once a predefined oil pressure is reached, the entire valve unit is displaced axially against the force of the compression spring (11), as a result of which the supply (4), via the bypass line (5), is opened, the heat sensitive element is a spring (2) made of a memory metal alloy, where respective ends of the spring (2) are operationally connected to a piston (3, 11), resulting in that at a temperature above a predefined threshold value, both pistons (3, 11) are displaced by the spring (2), which closes the supply (4), via the bypass line (5), and opens the oil supply (6) from the radiator (7), and at a temperature below the threshold value the spring (2) is in a relaxed state, so that when the supply (6) from the radiator (7) is closed, and the oil flow is conducted past the radiator (7) via the bypass line (5). 2. The bypass valve (1) for uncoupling the oil flow through a radiator according to claim 1, wherein at the temperature above the threshold value, a piston (3) facing the supply (4), via the bypass line (5), abuts against a step bore (13), and at the temperatures below the threshold value, a piston (3) facing the oil supply (6) rests against a step bore (13). 3. The bypass valve (1) for uncoupling the oil flow through a radiator according to claim 1, wherein a piston (9) is displaceably arranged around an other piston (3) and secured axially by way of a sleeve (12) on a side of the piston (9) facing the compression spring (11). 4. A bypass valve (1) for uncoupling an oil flow through a radiator (7) for a transmission, at low oil temperatures, the bypass valve (1) includes an oil supply (6) from the radiator (7), a supply (4), via a bypass line (5), and an oil outlet (8), and a valve unit, which is displaceably arranged inside a valve housing (10) against a force of a compression spring (11) connected in series, a heat sensitive element (2) moves inside the valve housing (10) subject to an oil temperature such that, at oil temperatures below a threshold value, the oil supply (6) from the radiator (7) is closed and the supply (4), via a bypass line (5), is opened as a result of which, at a temperature above the threshold value, the oil supply (6) from the radiator (7) is opened and the supply (4), via the bypass line (5), is closed resulting in that once a predefined oil pressure is reached, the valve unit is displaceable axially against the force of the compression spring (11) which causes the supply (4), via a bypass line (5), to open, and where the heat sensitive element is a spiral spring (17) made of a bimetal, where one end of the spiral spring (17) is connected to a first sleeve (18) and an other end of the spiral spring (17) is connected to a second sleeve (19), with the first and the second sleeves (18, 19) lying inside one another, so that rotary movement resulting from a change in temperature in the spiral spring (17) causes the first and the second sleeves (18, 19), lying inside one another, to be torsioned against one another, causing corresponding openings (21, 22) to one of close and to open, so that at temperatures below a threshold value, the oil supply (6) from the radiator (7) is closed and the supply (4), via the bypass line (5), is opened, and at temperatures above the threshold value, the oil supply (6) from the radiator (7) is opened and the supply (4), via the bypass line (5), is closed. 5. The bypass valve (1) for uncoupling the oil flow through a radiator according to claim 4, wherein a lid (20) is provided on a side of the spiral spring (17) facing the supply (4), via the bypass line (5). in order to balance tolerances of the spiral spring (17). 6. A bypass valve (1) for directing oil flow, the bypass valve (1) comprising: a first inlet (6) coupled to a radiator (7), which is coupled to a hydraulic consumer (16) enabling oil flow from the hydraulic consumer (16) through the radiator (7) to the bypass valve (1); a second inlet (4) coupled to the hydraulic consumer (16) enabling a bypass oil flow from the hydraulic consumer (16) to the bypass valve, bypassing the radiator (7); an outlet (8) coupled to the hydraulic consumer (16) enabling oil to flow from the bypass valve (1) to the hydraulic consumer (16); a valve unit being located within a housing (10) bypass valve (1) and including a heat sensitive element (2) which extends between and communicates with a first piston (3) and a second piston (9), and a compression spring (11) communicates with the second piston (9) and axially biases the second piston (9) toward the first piston (3); the heat sensitive element (2), at a temperature below a threshold temperature value, aligns the valve unit to prevent oil flow through the first inlet (6) and allow oil flow through the second inlet (4) and out the outlet (8); and the heat sensitive element (2), at a temperature above the temperature threshold value, aligns the valve unit to prevent oil flow through the second inlet (4) and allow oil flow through the first inlet (6) and out the outlet (8), if an oil pressure at the second inlet (4) is greater than a pressure threshold value, when the second inlet is closed the valve unit is biased toward the compression spring (11) to open the second inlet (4).