Hydraulic control for a dual clutch transmission
AssigneeLuK Lamellen und Kupplungsbau Beteiligungs KG
InventorsMartin STAUDINGER, Marco GRETHEL
Life of this patent
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Abstract
A double clutch gearbox which has a first volume flow valve for actuating a first clutch, which is arranged downstream, a second volume flow valve for actuating a second clutch which is arranged downstream, and a first hydraulic power source for supplying the volume flow valves and the clutches with a system pressure. In order to provide an improved double clutch gearbox, the clutches have a fluid cooling means which is arranged downstream of the first volume flow valve.
Claims10
A dual clutch transmission (10), with:
- a first volume flow valve (22) for activating a following first clutch (16),
- a second volume flow valve (31) for activating a following second clutch (18), and
- a first hydraulic energy source (80) for supplying the volume flow valves (22, 31) and the clutches (16, 18) with a system pressure, characterized in that the clutches (16, 18) have a fluid cooling (63) which follows the first volume flow valve (22).
The dual clutch transmission as claimed in one of the preceding claims, characterized in that, in a second switching position of the first volume flow valve (22), the first hydraulic energy source (80) is connected to the fluid cooling (63), for cooling the clutches (16, 18), the fluid cooling (63) being capable of being supplied with a comparatively low cooling pressure by means of the first hydraulic energy source (80).
The dual clutch transmission as claimed in one of the preceding claims, characterized in that, in a third switching position of the first volume flow valve (22), the first clutch (16) is connected to the first hydraulic energy source (80) and to the pressure accumulator (24) and can be supplied with the system pressure by means of the hydraulic energy source (26) and/or by means of the pressure accumulator (24).
The dual clutch transmission as claimed in one of the preceding claims, characterized in that, in the first and the second switching position of the first volume flow valve (22), the first clutch (16) is switched pressurelessly and is connected to a tank (28).
The dual clutch transmission as claimed in one of the preceding claims, characterized in that the fluid cooling (63) follows a second hydraulic energy source (81) which is driven by an internal combustion engine (17).
The dual clutch transmission as claimed in one of the preceding claims, characterized in that the first hydraulic energy source (80) is driven by an electric motor (79).
The dual clutch transmission as claimed in one of the preceding claims, characterized in that the fluid cooling (63) can be supplied by means of the first hydraulic energy source (80) even when the internal combustion engine (17) is at a standstill.
Dependencies are inferred from the claim text.