Dual piston accumulator

US8746287B2 · kind B2 · utility

Assignee

• HYDAC TECHNOLOGY GMBH · DE

Inventors

• Walter Dorr · Aichach, DE
• Herbert Baltes · Losheim, DE
• Peter Kloft · Ransbach-Baumbach, DE

Key dates

• Filing date: Apr 27, 2011
• Grant date: Jun 10, 2014
• Expiry date: Apr 27, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B2201/405
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A dual piston accumulator, in particular for a hydrostatic hybrid drive system for vehicles, replaces a high pressure hydro accumulator and a low pressure hydro accumulator. Inside a single accumulator housing (2) extending in the axial direction in a single piece over a high pressure part (4) and a low pressure part (6), an accumulator piston (8, 10) defines a high pressure-sided fluid chamber (16) and a low pressure-sided fluid chamber (18). Both chambers border an intermediate piece (12) separating the high pressure side (4) from the low pressure side (6). A common piston rod (14) extends through the intermediate piece for both accumulator pistons (8, 10). The wall width of the housing (2) corresponding to the high pressure part (4) is greater than the opposite reduced wall width corresponding to the low pressure part (6).