Variable flow pump
AssigneeHobourn Automotive Limited
InventorsDerek Keith Brighton, Simon John Baseley
Life of this patent
Estimating the term…
Abstract
A pump having an inlet port, an outlet port and a pumping mechanism for pumping fluid from the inlet port to the outlet port. The pumping mechanism includes a carrier (2) that is provide with a plurality of pumping of pumping elements. The pumping mechanism also includes a flexible cam ring (6) surrounding the carrier and having an internal cam surface that is followed by the pumping elements. The cam ring is flexible so that the discharge flow rate of the pump can be varied by varying the shape of the cam ring. Also, a control device is provided for controlling the shape of the cam ring. The control device and one or more cam orifices for controlling fluid pressure.
Claims27
A pump comprising an inlet port, an outlet port and a pumping mechanism for pumping fluid from the inlet port to the outlet port at a discharge flow rate, said pumping mechanism comprising:
- a carrier including a plurality of pumping elements formed thereon or mounted therein;
- a flexible cam ring surrounding said carrier and having an internal cam surface that is followed by said pumping elements, wherein said cam ring is flexible so that the discharge flow rate may be varied by varying the shape of said cam ring;
- and
- control means for controlling the shape of said cam ring, said control means comprising one or more resilient biasing devices and one or more cam orifices which control fluid pressure.
Dependencies are inferred from the claim text.