| US 7,488,163 B2 | ||
| Trochoid oil pump | ||
| Kazuo Enzaka, Gunma-ken (Japan); Masahiro Kasahara, Gunma-ken (Japan); Yasunori Ono, Gunma-ken (Japan); Kenichi Fujiki, Gunma-ken (Japan); Keiichi Kai, Gunma-ken (Japan); Yoshiaki Senga, Gunma-ken (Japan); and Atsushi Kaneko, Gunma-ken (Japan) | ||
| Assigned to Yamada Manufacturing Co., Ltd., Kiryu-shi, Gunma-ken (Japan) | ||
| Filed on Dec. 21, 2005, as Appl. No. 11/312,444. | ||
| Claims priority of application No. 2004-378193 (JP), filed on Dec. 27, 2004. | ||
| Prior Publication US 2006/0140809 A1, Jun. 29, 2006 | ||
| Int. Cl. F04C 2/10 (2006.01) | ||
| U.S. Cl. 418—190 [418/61.3; 418/166; 418/171; 418/189] | 19 Claims |
| 1. A trochoid oil pump in which an interdental space constituted by an inner rotor and an outer rotor that meshes with the
inner rotor, both the inner rotor and outer rotor having a trochoidal tooth profile or a substantially trochoidal tooth profile
which forms a sealed space in a partition section between a trailing end portion of an intake port and a leading end portion
of a discharge port or a protruding linking groove formed as a shallow groove from the start portion of the discharge port
to the intake port side,
wherein a compression stroke in which the interdental space constituting the sealing space in the partition section is moved
toward the discharge port side and a volume of the interdental space reduces to form a compressed state and form a state in
which the interdental space does not directly open to the discharge port or the protruding linking groove of the discharge
port is established,
wherein a linking gap variable by a rotation of the rotor such that a width of a relative gap between the tooth profile of
the inner rotor and the tooth profile of the outer rotor gradually expands in the compression stroke in the partition section
is provided so as to be constituted between the interdental space of the compression stroke in the partition section and a
succeeding interdental space already opened and linked to the discharge port or the protruding linking groove of the discharge
port, the linking gap causing a fluid to flow between the succeeding interdental space and the interdental space of the compression
stroke in the partition section,
wherein the operation for expanding the linking gap is maintained to at least a vicinity of a discharge start position of
the discharge port of the interdental space of the compression stroke or the protruding linking groove of the discharge port,
and
wherein the interdental space having passed through the compression stroke opens and links to the discharge port or the protruding
linking groove of the discharge port.
|