Hydraulic circuit for a toroidal transmission

• US 7,591,755 B2
• Filed: 11/10/2006
• Issued: 09/22/2009
• Est. Priority Date: 05/11/2004
• Status: Expired due to Fees

• Current Assignee: BMW AG (Bayerische Motoren Werke AG), Getrag Getriebe- und Zahnradfabrik Hermann Hagenmeyer GmbH & CIE KG
• Original Assignee: CIE KG and Bayerische Motorenwerke AG, Getrag Getriebe- und Zahnradfabrik Hermann Hagenmeyer GmbH & CIE KG
• Inventors: Wild, Andreas, Wolf, Lothar, Kress, Thomas, Petrzik, Gunther
• Primary Examiner(s): Joyce; William C
• Application Number:
  US11/598,215
• Publication Number:
  US 20070167274A1
• Time in Patent Office: 1,047 Days
• Field of Search: 476/10, 476/40, 476/41, 476/42, 476/46
• US Class Current: 476/10
• CPC Class Codes: F16H 2015/383 with two or more sets of toroid gearings arranged in parallel
• CPC Class Codes: F16H 2061/0037 characterised by controlled fluid supply to lubrication circuits of the gearing see also lubrication control F16H57/0446
• CPC Class Codes: F16H 61/0021 Generation or control of line pressure
• CPC Class Codes: F16H 61/6648 controlling of shifting being influenced by a signal derived from the engine and the main coupling
• CPC Class Codes: F16H 61/6649 characterised by the means for controlling the torque transmitting capability of the gearing

Abstract

A hydraulic circuit for a toroidal transmission comprises: a) a single pump, b) a main pressure controller connected to the pump to generate a main line pressure in a main line, c) a roller controller connected to the main line to generate two roller control pressures from the main line pressure, d) at least one hydraulic roller actuator for adjusting a roller in a toroidal space set up by two disks, the roller actuator being connected to the roller controller, e) a disk controller connected to the main line, a disk control pressure being generated in the disk controller from the main line pressure, and f) at least one hydraulic disk actuator for axially adjusting at least one of the disks, the disk actuator being connected to the disk controller.

Claims

1. A hydraulic circuit for a toroidal transmission with:

a single pump,

a main pressure controller which is connected to the pump for generating a main line pressure in a main line,

a roller controller which is connected to the main line, two roller control pressures being generated in the roller controller from the main line pressure,

at least one hydraulic roller actuator for spatial adjustment of a roller in a toroidal space which is set up by two disks, the roller actuator being connected to the roller controller,

a disk controller which is connected to the main line, a disk control pressure being generated in the disk controller from the main line pressure,

at least one hydraulic disk actuator for axially adjusting at least one of the disks, the disk actuator being connected to the disk controller,

a clutch pressure controller which generates a clutch pressure in a clutch line from the main line pressure,

a cooler pressure controller which generates a cooling pressure in a cooling line from the clutch pressure, and

a cooler which is connected to the cooling line.

2. The hydraulic circuit as claimed in claim 1, with a clutch control device which is connected to the clutch line, a clutch control pressure being generated in the clutch control device from the clutch pressure.

3. The hydraulic circuit as claimed in claim 2, with at least one hydraulic clutch actuator for actuating at least one range clutch, the clutch actuator being connected to the clutch control device.

4. The hydraulic circuit as claimed in claim 1, with a lubricating oil pressure controller which generates a lubricating oil pressure in a lubricating oil line from the cooling pressure.

5. The hydraulic circuit as claimed in claim 4, the lubricating oil line being connected to the outlet of a cooler.

6. The hydraulic circuit as claimed in claim 4, the lubricating oil line being connected to the roller controller and receiving oil which has been displaced from the roller controller.

7. The hydraulic circuit as claimed in claim 1, the pump being a hydrostatic pump.