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US 5,509,383 AGranted
Hydraulic unit
AssigneeITT Automotive Europe GmbH
InventorsManfred Kahrs, Gerhard Kunz, Franz Fleck, Hans-Gebhard Krines, Walter Peterknecht, Winfried Huthmacher
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Abstract
A hydraulic system with a hydraulic pump driven directly by an internal-combustion engine reduces the dimension, weight and number of component parts used in the state of the art systems while optimizing energy exploitation. A plurality of elements, one of which is a cam shaft adjusting device, are supplied with hydraulic pressure fluid by one and the same pump. A series of simplified hydraulic connections enables equivalent devices to be driven simultaneously by one or more pump circuits.
Claims3
A hydraulic system comprising:
- a hydraulic pump driven by an internal combustion engine;
- a restrictor disposed on an intake side of the hydraulic pump wherein the restrictor limits a delivery rate of hydraulic pressure fluid to the pump;
- a first device supplied with hydraulic pressure fluid by said pump, wherein said first device is a variable cam shaft phase adjusting device for inlet valves,
- at least one second device supplied with hydraulic pressure fluid by said pump;
- wherein said second device is a variable cam shaft phase adjusting phase device for outlet valves,
- a proportional control valve fluidly connecting said first device with said pump,
- a two position valve fluidly connecting said second device with said pump,
- further wherein said second device connected to the pump through said two-position valve requires a lower driving pressure than the first device actuated by said proportional control valve.
5 more elements
Dependencies are inferred from the claim text.