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US 6,306,060 B1Granted
Cooling fluid supply to hydraulically actuated rollers in a continuously-variable-ratio transmission
AssigneeTorotrak (Development) Limited
InventorsBrian Joseph Dutson, Andrew Damian De Freitas
Life of this patent
Estimating the term…
Abstract
A roller control unit for a CVT includes a cylinder (54) having a piston (70) positioned therein and operably connected to a roller assembly of said CVT thereby to control its position. The unit includes a lubrication supply which comprises a chamber (94) between the cylinder (54) and piston (70) and one or more radially extending passageways (102) through said piston (70). These passageways are in flow communication with the roller and act to direct cooling fluid to said roller. Radial supply of said lubrication facilitates a reduction in flow losses within the supply.
Claims17
A roller control unit for a continuously-variable-ratio transmission comprises:
- a cylinder having a cylinder wall;
- a piston having a piston wall and located within the cylinder and being axially translatable therealong;
- a chamber, formed by said cylinder and piston for receiving said fluid which, in operation, causes said piston to move between first and second axially displaced positions;
- and
- a fluid supply passage, for supplying fluid to a roller connected to said piston for movement therewith;
- wherein said fluid supply passage comprises a further chamber formed between said piston wall and cylinder wall and at least one radially extending passageway through said piston, said at least one passageway having a first end in fluid communication with said further chamber and having a second end in communication with said roller.
3 more elements
A roller control unit for a continuously-variable-ratio transmission comprises:
- a cylinder having a cylinder wall;
- a piston, within the cylinder and being axially translatable therealong;
- a chamber, formed by said cylinder and piston for receiving fluid which, in operation, causes said piston to move between first and second axially displaced positions;
- and
- a fluid supply passage, for supplying said fluid to a roller connected to said piston for movement therewith;
- wherein said fluid supply passage comprises a further chamber formed between said piston and cylinder wall and at least one radially extending passageway through said piston, said at least one passageway having a first end in fluid communication with said further chamber and having a second end in communication with said roller in which said further chamber comprises a recess in said cylinder wall.
3 more elements
A roller control unit for a continuously-variable-ratio transmission comprises:
- a cylinder having a cylinder wall;
- a piston, within the cylinder and being axially translatable therealong;
- a chamber, formed by said cylinder and piston for receiving fluid which, in operation, causes said piston to move between first and second axially displaced positions;
- and
- a fluid supply passage, for supplying said fluid to a roller connected to said piston for movement therewith;
- wherein said fluid supply passage comprises a further chamber formed between said piston and cylinder wall and at least one radially extending passageway through said piston, said at least one passageway having a first end in fluid communication with said further chamber and having a second end in communication with said roller in which said further chamber comprise a recess in the outer surface of said piston.
3 more elements
A roller control unit for a continuously-variable-ratio transmission comprises:
- a cylinder having a cylinder wall;
- a piston, within the cylinder and being axially translatable therealong;
- a chamber, formed by said cylinder and piston for receiving fluid which, in operation, causes said piston to move between first and second axially displaced positions;
- and
- a fluid supply passage, for supplying said fluid to a roller connected to said piston for movement therewith;
- wherein said fluid supply passage comprises a further chamber formed between said piston and cylinder wall and at least one radially extending passageway through said piston, said at least one passageway having a first end in fluid communication with said further chamber and having a second end in communication with said roller, wherein the piston comprises a hollow piston having a cavity therein and in which one or more of the second ends of said at least one passageway is in flow communication therewith and further including a roller support stem having an axially extending fluid supply duct and in which said duct includes a first end in fluid communication with said cavity for receiving fluid therefrom.
3 more elements
A roller control unit for a continuously-variable-ratio transmission comprises:
- a cylinder having a cylinder wall;
- a piston, within the cylinder and being axially translatable therealong;
- a chamber, formed by said cylinder and piston for receiving fluid which, in operation, causes said piston to move between first and second axially displaced positions;
- and
- a fluid supply passage, for supplying said fluid to a roller connected to said piston for movement therewith;
- wherein said fluid supply passage comprises a further chamber formed between said piston and cylinder wall and at least one radially extending passageway through said piston, said at least one passageway having a first end in fluid communication with said further chamber and having a second end in communication with said roller, wherein the piston comprises a hollow piston having a cavity therein and in which one or more of the second ends of said at least one passageway is in flow communication therewith in which said cavity comprises an open ended cavity having an open end and said unit further includes a plug fixed relative to said cylinder and extending into said open end of said piston, thereby to define said cavity between itself an end face of said piston.
3 more elements
A roller control unit for a continuously-variable-ratio transmission comprises:
- a cylinder having a cylinder wall;
- a piston, within the cylinder and being axially translatable therealong;
- a chamber, formed by said cylinder and piston for receiving fluid which, in operation, causes said piston to move between first and second axially displaced positions;
- and
- a fluid supply passage, for supplying fluid to a roller connected to said piston for movement therewith;
- wherein said fluid supply passage comprises a further chamber formed between said piston and cylinder wall and at least one radially extending passageway through said piston, said at least one passageway having a first end in fluid communication with said further chamber and having a second end in communication with said roller in which said piston includes a plug portion which defines a chamber between itself and an end face of the roller stem and a chamber formed therebetween for receiving fluid.
3 more elements
A roller control unit for a continuously-variable-ratio transmission comprises:
- a cylinder having a cylinder wall;
- a piston, within the cylinder and being axially translatable therealong;
- a chamber, formed by said cylinder and piston for receiving fluid which, in operation, causes said piston to move between first and second axially displaced positions;
- and
- a fluid supply passage, for supplying said fluid to a roller connected to said piston for movement therewith;
- wherein said fluid supply passage comprises a further chamber and at least one radially extending passageway through said piston, said at least one passageway having a first end in fluid communication with said further chamber and having a second end in communication with said roller, said further chamber comprising a substantially constant volume chamber during movement of said piston.
3 more elements
Dependencies are inferred from the claim text.