Positive displacement rotary machine

A positive displacement rotary fluid pump comprising:

• a piston rotor rotatable about a first axis and including a number of pistons equally spaced about said first axis and rotatably mounted about their axes on said piston rotor;
• a chamber rotor rotatable about a second axis spaced from said first axis, including a central common chamber and a number of radial fluid chambers arranged in diametrically opposed pairs across said common chamber, and guide tracks extending between opposing said pairs of radial chambers across said common chamber for kinematically constraining each of said pistons as they move from one of their associated radial chambers to the other through said common chamber;
• and
• intake and exhaust ports for introducing and exhausting fluid from said radial chambers;
• said intake and exhaust ports each extend along the said chamber rotor over the period when each piston moves between top dead center and bottom dead center in each of its associated pair of radial chambers;
• one of said rotors is connected to a source of rotary input power, said intake port is connected to a source of fluid and the fluid is provided pressurized at said exhaust port.

A positive displacement rotary fluid motor

• a piston rotor rotatable about a first axis and including a number of pistons equally spaced about said first axis and rotatably mounted about their axes on said piston rotor;
• a chamber rotor rotatable about a second axis spaced from said first axis, including a central common chamber and a number of radial fluid chambers arranged in diametrically opposed pairs across said common chamber, and guide tracks extending between opposing said pairs of radial chambers across said common chamber for kinematically constraining each of said pistons as they move from one of their associated radial chambers to the other through said common chamber;
• and
• intake and exhaust ports for introducing and exhausting fluid from said radial chambers;
• said intake and exhaust ports each extend along the said chamber rotor over the period when each piston moves between top dead center and bottom dead center in each of its associated pair of radial chambers;
• said intake port is connected to a source of pressurized fluid, and one of said rotors is connected to a drive device for providing output rotary power.

A positive displacement rotary vacuum pump comprising:

• a piston rotor rotatable about a first axis and including a number of pistons equally spaced about said first axis and rotatably mounted about their axes on said piston rotor;
• a chamber rotor rotatable about a second axis spaced from said first axis, including a central common chamber and a number of radial fluid chambers arranged in diametrically opposed pairs across said common chamber, and guide tracks extending between opposing said pairs of radial chambers across said common chamber for kinematically constraining each of said pistons as they move from one of their associated radial chambers to the other through said common chamber;
• and
• intake and exhaust ports for introducing and exhausting fluid from said radial chambers;
• said exhaust port is connected to a container to be evacuated, said exhaust port extends along the chamber rotor over the period when each piston approaches bottom dead center, and one of said rotors is connected to a drive device for providing rotary input power.

A positive displacement rotary compressor comprising:

• a piston rotor rotatable about a first axis and including a number of pistons equally spaced about said first axis and rotatably mounted about their axes on said piston rotor;
• a chamber rotor rotatable about a second axis spaced from said first axis, including a central common chamber and a number of radial fluid chambers arranged in diametrically opposed pairs across said common chamber, and guide tracks extending between opposing said pairs of radial chambers across said common chamber for kinematically constraining each of said pistons as they move from one of their associated radial chambers to the other through said common chamber;
• and
• intake and exhaust ports for introducing and exhausting fluid from said radial chambers;
• said exhaust port is connected to a compressor tank, said intake port extends along the chamber rotor over the period when each piston approaches top dead center;
• and one of said rotors is connected to a drive device for providing rotary input power.

A positive displacement rotary two stroke scavenged intake and exhaust engine comprising:

• a piston rotor rotatable about a first axis and including a number of pistons equally spaced about said first axis and rotatably mounted about their axes on said piston rotor;
• a chamber rotor rotatable about a second axis spaced from said first axis, including a central common chamber and a number of radial fluid chambers arranged in diametrically opposed pairs across said common chamber, and guide tracks extending between opposing said pairs of radial chambers across said common chamber for kinematically constraining each of said pistons as they move from one of their associated radial chambers to the other through said common chamber;
• and
• intake and exhaust ports for introducing and exhausting fluid from said radial chambers;
• said intake and exhaust ports extend along the said chamber rotor over the period when each piston moves from bottom dead center of its exhaust stroke in one of its associated radial chambers to bottom dead center of its intake stroke in the other of its associated radial chambers and one of said rotors is connected to a drive device for providing rotary output power.