Dual lock pin phaser
AssigneeBorgWarner Inc.
InventorFranklin R. Smith
Life of this patent
Estimating the term…
Abstract
A system including a phaser with a first lock pin and a second lock pin in the rotor assembly. The first and second locks pins having a locked position where they engage a recess in the housing assembly and an unlocked position in which they do not engage the housing assembly. The first lock pin locks the rotor assembly to the housing assembly when the phaser is in or near an intermediate phase angle position. The second lock pin locks the rotor assembly to the housing assembly when the phaser is at a full retard position. Alternatively, the second lock pin can lock the rotor assembly to the housing assembly when the phaser is at a full advance position.
Claims58
A variable cam timing system including a phaser for an internal combustion engine including a housing assembly with an outer circumference for accepting drive force and a rotor assembly coaxially located within the housing for connection to a camshaft, having a plurality of vanes, wherein the housing assembly and the rotor assembly define at least one chamber separated by a vane into an advance chamber with an advance wall and a retard chamber with a retard wall, the vane within the chamber acting to shift relative angular position of the housing assembly and the rotor assembly when fluid is supplied to the advance chamber or the retard chamber, the system comprising:
- a control valve for directing fluid from a fluid input to and from the advance chamber and the retard chamber through an advance line, a retard line, a supply line coupled to the fluid input, and at least one exhaust line, and
- the control valve being movable between a detent mode and an oil pressure actuated mode comprising:
- an advance mode in which fluid is routed from the fluid input to the advance chamber and fluid is routed from the retard chamber to the exhaust lines, a retard mode in which fluid is routed from the fluid input to the retard chamber and fluid is routed from the advance chamber to the exhaust lines, a holding position in which fluid is routed to the advance chamber and the retard chamber and a retard locking mode in which the vane is adjacent to the advance wall;
- a first lock pin slidably located in the rotor assembly, the first lock pin being moveable within the rotor assembly from a locked position in which an end portion of the first lock pin engages a first recess of the housing assembly, to an unlocked position in which the end portion does not engage the first recess of the housing assembly, the first recess in fluid communication with the supply line;
- and
- a second lock pin slidably located in the rotor assembly, the second lock pin being moveable within the rotor assembly from a locked position in which an end portion of the second lock pin engages a second recess of the housing assembly, to an unlocked position in which the end portion does not engage the second recess of the housing assembly, the second recess in fluid communication with the advance chamber;
- wherein when the control valve is in the retard locking mode, fluid to the second recess flows to the advance chamber and the second lock pin engages the second recess of the housing assembly, locking the relative angular position of the housing assembly and the rotor assembly;
- and
- wherein when the control valve is in the detent mode, the control valve blocks the at least one exhaust line, retaining fluid within the advance chamber and retard chamber and blocks the supply line to the first recess, such that the first lock pin engages the first recess of the housing assembly, locking the relative angular position of the housing assembly and the rotor assembly.
A variable cam timing system including a phaser for an internal combustion engine including a housing assembly with an outer circumference for accepting drive force and a rotor assembly coaxially located within the housing for connection to a camshaft, having a plurality of vanes, wherein the housing assembly and the rotor assembly define at least one chamber separated by a vane into an advance chamber with an advance wall and a retard chamber with a retard wall, the vane within the chamber acting to shift relative angular position of the housing assembly and the rotor assembly when fluid is supplied to the advance chamber or the retard chamber, the system comprising:
- a control valve for directing fluid to and from the chambers through an advance line, a retard line, a common line, an advance detent line and a retard detent line, the control valve being movable in a first bore towards an advance mode, a holding position, a retard mode, a retard locking mode, and a detent mode,
- a first lock pin slidably located in the rotor assembly, the first lock pin being moveable within the rotor assembly from a locked position in which an end portion of the first lock pin engages a first recess of the housing assembly, to an unlocked position in which the end portion does not engage the first recess of the housing assembly, the first recess in fluid communication with a supply line connected to a fluid input;
- and
- a second lock pin slidably located in the rotor assembly, the second lock pin being moveable within the rotor assembly from a locked position in which an end portion of the second lock pin engages a second recess of the housing assembly, to an unlocked position in which the end portion does not engage the second recess of the housing assembly, the second recess in fluid communication with another line connected to a fluid input;
- wherein when the control valve is moved to the detent mode, the advance detent line or the retard detent line are in fluid communication with the common line, the rotor assembly is moved to the intermediate phase angle position relative to the housing assembly and the first lock pin engages the first recess of the housing assembly, locking the relative angular position of the housing assembly and the rotor assembly;
- and
- wherein when the control valve is in the retard locking mode in which the vane is adjacent to the advance wall, fluid to the second recess is exhausted and the second lock pin engages the second recess of the housing assembly, locking the relative angular position of the housing assembly and the rotor assembly.
A variable cam timing system including a phaser for an internal combustion engine including a housing assembly with an outer circumference for accepting drive force and a rotor assembly coaxially located within the housing for connection to a camshaft, having a plurality of vanes, wherein the housing assembly and the rotor assembly define at least one chamber separated by a vane into an advance chamber with an advance wall and a retard chamber with a retard wall, the vane within the chamber acting to shift relative angular position of the housing assembly and the rotor assembly when fluid is supplied to the advance chamber or the retard chamber, the system comprising:
- a control valve for directing fluid from a fluid input to and from the advance chamber and the retard chamber through an advance line, a retard line, a supply line coupled to the fluid input, and at least one exhaust line, and
- the control valve being movable between a detent mode and an oil pressure actuated mode comprising:
- an advance mode in which fluid is routed from the fluid input to the advance chamber and fluid is routed from the retard chamber to the exhaust lines, a retard mode in which fluid is routed from the fluid input to the retard chamber and fluid is routed from the advance chamber to the exhaust lines, a holding position in which fluid is routed to the advance chamber and the retard chamber and an advance locking mode in which the vane is adjacent to the retard wall;
- a first lock pin slidably located in the rotor assembly, the first lock pin being moveable within the rotor assembly from a locked position in which an end portion of the first lock pin engages a first recess of the housing assembly, to an unlocked position in which the end portion does not engage the first recess of the housing assembly, the first recess in fluid communication with the supply line;
- and
- a second lock pin slidably located in the rotor assembly, the second lock pin being moveable within the rotor assembly from a locked position in which an end portion of the second lock pin engages a second recess of the housing assembly, to an unlocked position in which the end portion does not engage the second recess of the housing assembly, the second recess in fluid communication with the retard chamber;
- wherein when the control valve is in the advance locking mode, fluid to the second recess flows to the retard chamber and the second lock pin engages the second recess of the housing assembly, locking the relative angular position of the housing assembly and the rotor assembly;
- and
- wherein when the control valve is in the detent mode, the control valve blocks the at least one exhaust line, retaining fluid within the advance chamber and retard chamber and blocks the supply line to the first recess, such that the first lock pin engages the first recess of the housing assembly, locking the relative angular position of the housing assembly and the rotor assembly.
A variable cam timing system including a phaser for an internal combustion engine including a housing assembly with an outer circumference for accepting drive force and a rotor assembly coaxially located within the housing for connection to a camshaft, having a plurality of vanes, wherein the housing assembly and the rotor assembly define at least one chamber separated by a vane into an advance chamber with an advance wall and a retard chamber with a retard wall, the vane within the chamber acting to shift relative angular position of the housing assembly and the rotor assembly when fluid is supplied to the advance chamber or the retard chamber, the system comprising:
- a control valve for directing fluid to and from the chambers through an advance line, a retard line, a common line, an advance detent line and a retard detent line, the control valve being movable in a first bore towards an advance mode, a holding position, a retard mode, an advance locking mode, and a detent mode,
- a first lock pin slidably located in the rotor assembly, the first lock pin being moveable within the rotor assembly from a locked position in which an end portion of the first lock pin engages a first recess of the housing assembly, to an unlocked position in which the end portion does not engage the first recess of the housing assembly, the first recess in fluid communication with a supply line connected to a fluid input;
- and
- a second lock pin slidably located in the rotor assembly, the second lock pin being moveable within the rotor assembly from a locked position in which an end portion of the second lock pin engages a second recess of the housing assembly, to an unlocked position in which the end portion does not engage the second recess of the housing assembly, the second recess in fluid communication with another line connected to a fluid input;
- wherein when the control valve is moved to the detent mode, the advance detent line or the retard detent line are in fluid communication with the common line, the rotor assembly is moved to the intermediate phase angle position relative to the housing assembly and the first lock pin engages the first recess of the housing assembly, locking the relative angular position of the housing assembly and the rotor assembly;
- and
- wherein when the control valve is in the advance locking mode in which the vane is adjacent to the retard wall, fluid to the second recess is exhausted and the second lock pin engages the second recess of the housing assembly, locking the relative angular position of the housing assembly and the rotor assembly.
A variable cam timing system including a phaser for an internal combustion engine including a housing assembly with an outer circumference for accepting drive force and a rotor assembly coaxially located within the housing for connection to a camshaft, having a plurality of vanes, wherein the housing assembly and the rotor assembly define at least one chamber separated by a vane into an advance chamber with an advance wall and a retard chamber with a retard wall, the vane within the chamber acting to shift relative angular position of the housing assembly and the rotor assembly when fluid is supplied to the advance chamber or the retard chamber, the system comprising:
- a control valve for directing fluid to and from the chambers through an advance line, a retard line, a common line, the control valve being movable in a first bore towards an advance mode, an advance locking mode, a holding position, a retard mode, a retard locking mode,
- a first lock pin slidably located in the rotor assembly, the first lock pin being moveable within the rotor assembly from a locked position in which an end portion of the first lock pin engages a first recess of the housing assembly, to an unlocked position in which the end portion does not engage the first recess of the housing assembly, the first recess in fluid communication with a supply line connected to a fluid input;
- and
- a second lock pin slidably located in the rotor assembly, the second lock pin being moveable within the rotor assembly from a locked position in which an end portion of the second lock pin engages a second recess of the housing assembly, to an unlocked position in which the end portion does not engage the second recess of the housing assembly, the second recess in fluid communication with another line connected to a fluid input;
- wherein when the control valve is in the retard locking mode in which the vane is adjacent to the advance wall, fluid to the second recess is exhausted and the second lock pin engages the second recess of the housing assembly, locking the relative angular position of the housing assembly and the rotor assembly;
- wherein when the control valve is in the advance locking mode in which the vane is adjacent to the retard wall, fluid to the first recess is exhausted and the first lock pin engages the first recess of the housing assembly, locking the relative angular position of the housing assembly and the rotor assembly.
Dependencies are inferred from the claim text.