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US4345489A Expired / Lapsed US ⏱️ 0.0 years remaining

Hydraulic control system for servos in automatic transmissions

Assignee: Robert Bosch GmbH
•
Filing: 1980-01-14
•
Granted: 1982-08-24
•
Expires: 2000-01-14
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Abstract

Abstract The invention pertains to a hydraulic control system for servos in automatic transmissions, which, in a known fashion, utilizes a main pressure valve to regulate the pressure within the control system and further utilizes a converter pressure valve to supply a hydrodynamic torque converter and the lubrication system. The servos (for example, the clutches) utilized in this type of automatic transmissions cooperate with electromagnetically actuated pressure regulating valves have a current-proportional response. These electromagnetic valves are actuated by electronic control signals generated by sensors which monitor various parameters during operation, making previously utilized sensors superfluous. By control of the pressure regulating valves the forward gear, the reverse gear or the neutral gear can be engaged in the simplest fashion. By means of a magnet valve associated with the main pressure valve the levels of pressure may be varied. It is also possible, via simple associated elements, to install an emergency system which during a failure of the electrical system allows the transmission to continue to operate.

Inventors

  • 👤 Alfred Muller
  • 👤 Manfred Schwab
  • 👤 Meinrad Feder
  • 👤 Achim Schreiber
  • 👤 Joseph Sauer

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 11:14
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/0021; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0206; F16H61/0251; F16H2061/0209; F16H2061/0258; F16H61/12

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 83 words
A hydraulic control system for a plurality of switching elements of an automatic transmission including a main conduit, a main pressure valve to regulate the pressure in the main conduit and a torque converter valve, comprising a plurality of electromagnetically actuated pressure regulating valves connected in parallel to said main pressure conduit, each pressure regulating valve having a corresponding variable fluid opening, the variation of said opening being proportional to applied electrical current, and each switching element being connected to the main pressure
Claim 2
Dependent Claim 83 words
A hydraulic control system for a plurality of switching elements of an automatic transmission including a main conduit, a main pressure valve to regulate the pressure in the main conduit and a torque converter valve, comprising a plurality of electromagnetically actuated pressure regulating valves connected in parallel to said main pressure conduit, each pressure regulating valve having a corresponding variable fluid opening, the variation of said opening being proportional to applied electrical current, and each switching element being connected to the main pressure
Claim 3
Dependent Claim 30 words
An arrangement according to claim 1, characterized in that the main pressure valve is associated with an electromagnetically acutated magnetic valve (41), whereby various levels of pressure, and particularly an
Claim 4
Dependent Claim 22 words
An arrangement according to claim 1, characterized in that the main pressure valve is associated with two logic valves whereby the pressure
Claim 5
Dependent Claim 82 words
An arrangement according to claim 1, characterized in that the main pressure valve is associated with a magnet valve whereby the main pressure valve can be subjected to various levels of pressure and the switching elements for example, for the reverse gear are associated with an electromagnetic valve and three check valves utilizing ball checks and the switching element for third gear is associated with a magnetic valve and a ball check, with both magnet valves connected in parallel to the main
Claim 6
Dependent Claim 48 words
An arrangement according to claim 1, characterized in that an electrical switch is provided for an emergency program, as is a multi-position switch for the various gears, whereby these switches, through an AND-gate and two relays along with final outputs and diode networks operate on the switching elements.

References Cited (Backward Citations)

US3247740A Cited
US3690197A Cited
DE2113159A1 Cited
US3744347A Cited
US3709064A Cited
US3747438A Cited
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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-08-23 1986-02-22 1986-08-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-08-23 1990-02-22 1990-08-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-08-23 1994-02-22 1994-08-24 $7700.00 Window Closed / Lapsed

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