Trochoid oil pump

A trochoid oil pump comprising:

• a rotor chamber comprising an intake port, a discharge port, and a partition section located between said intake port and said discharge port;
• and
• an inner rotor and an outer rotor having trochoid tooth profile or substantially trochoid tooth profile,
• wherein, with an interdental space constituted by said inner rotor and said outer rotor starting compression after completion of confinement in said partition section between the trailing end portion of said intake port and the leading end portion of said discharge port, a linking gap that links said interdental space and a preceding interdental space that is adjacent to said interdental space is formed by a region without a contact with the tooth profile of said inner rotor formed between the tooth apex portion and the tooth base portion of the tooth profiles of said outer rotor, and said linking gap gradually expands with the rotation of the rotor.

A trochoid oil pump comprising:

• a rotor chamber comprising an intake port, a discharge port, and a partition section located between said intake port and discharge port;
• and
• an inner rotor and an outer rotor having trochoid tooth profile or substantially trochoid tooth profile,
• wherein a concave recess portion is formed between the tooth apex portion and the tooth base portion of the tooth profiles of said outer rotor,
• the interdental space constituted by said inner rotor and outer rotor forms an intake stroke in said intake port, an intake end stroke and a compression stroke in the partition section, and a discharge stroke in the discharge port,
• a linking gap produced by said recess portion is formed between the interdental space of said compression stroke and an interdental space in the discharge stroke which is preceding and adjacent with respect to said interdental space, and
• said linking gap gradually expands with the rotation of the rotor.