Patent application number | Description | Published |
20130323106 | ROTOR FOR OIL PUMP - A rotor for an oil pump according to the present invention is a rotor that includes an inner rotor configured by teeth, each of which has a plurality of ellipses or circles, and an outer rotor that is disposed on the outside of the inner rotor and has one tooth more than the inner rotor, wherein, in a tooth of the inner rotor, a tooth top and a tooth root of a drive-side half-tooth region extending from the tooth top to the tooth root and a tooth top and a tooth root of a non-drive-side half-tooth region extending from the tooth top to the tooth root are each configured by a different ellipse or a circle. A circumferential axis along a circumferential direction of the ellipse or circle configuring the tooth top is longer in the non-drive-side half-tooth region than in the drive-side half-tooth region. | 12-05-2013 |
20140023539 | OIL PUMP - The oil pump includes a pump housing in which a second partitioning section is formed between a trailing end section of a discharge port and a leading end section of an intake port. The width dimension of the second partitioning section is the same as or slightly larger than the formation range of a space between teeth which is constituted by an inner rotor and an outer rotor passing the second partitioning section during low-speed rotation. A protruding surface section is formed in the same plane as and continuously with the second partitioning section from the vicinity of an inner diameter side of the trailing end section of the discharge port. The protruding surface section and the second partitioning section are the same as or slightly larger than the formation range of the space between teeth which passes the protruding surface section and the second partitioning section during high-speed rotation. | 01-23-2014 |
20140060476 | ENGINE LUBRICATION CONTROL SYSTEM - The present invention provides an engine lubrication control system including an engine, an oil pump which is driven by the engine, an oil circuit which extends downstream from the oil pump, and a plurality of oil branch supply paths which branch from the oil circuit and supply oil to each part of the engine. An electronically-controlled first hydraulic control valve which controls, in a stepwise manner, a discharge pressure of the oil pump relative to a speed of the engine is disposed on the oil circuit, a hydraulically-driven second hydraulic control valve is disposed on at least one of the plurality of oil branch supply paths, and a downstream hydraulic pressure of the second hydraulic control valve is controlled to be lower than a downstream hydraulic pressure of the first hydraulic control valve of the oil circuit at least across a predetermined engine speed range. | 03-06-2014 |
20140060477 | ENGINE LUBRICATION CONTROL SYSTEM - The present invention provides an engine lubrication control system including an engine, an oil pump which is driven by the engine, an oil circuit which extends downstream from the oil pump, and a plurality of oil branch supply paths which branch from the oil circuit and supply oil to each part of the engine. An electronically-controlled first hydraulic control valve which controls, in a stepwise manner, a discharge pressure of the oil pump relative to a speed of the engine is disposed on the oil circuit, a hydraulically-driven second hydraulic control valve is disposed on at least one of the plurality of oil branch supply paths, and a downstream hydraulic pressure of the second hydraulic control valve is controlled to be lower than a downstream hydraulic pressure of the first hydraulic control valve of the oil circuit at least across a predetermined engine speed range. | 03-06-2014 |
20140154119 | INTERNAL GEAR PUMP - The internal gear pump includes: an inner rotor; an outer rotor that rotates by having predetermined eccentricity to a rotation center of the inner rotor; an outer ring that holds the outer rotor in a freely rotatable state, and is also formed with at least three cam protruded parts; a pump housing having a rotor chamber; protruded-wall surface parts that are formed on an inner periphery side surface of the rotor chamber and are also formed in the same number as that of the cam protruded parts; and operation means for oscillating the outer ring. A diameter center of the holding-inner peripheral part of the outer ring is moved by the operation means along a locus of a circle of which a radius is the eccentricity to the rotation center of the inner rotor. | 06-05-2014 |
20140154120 | INTERNAL GEAR PUMP - The internal gear pump according to the present invention includes: an inner rotor; an outer rotor that rotates with predetermined eccentricity to a rotation center of the inner rotor; an outer ring that rotatably holds the outer rotor, and has at least three cam protruded parts formed; a pump housing that has a rotor chamber; pins in the same number as that of the cam protruded parts; and operation means for oscillating the outer ring. Positions of the pins are set so that a diameter center of the holding-inner peripheral part of the outer ring is moved by the operation means along a locus of a circle, the radius of which is the eccentricity to the rotation center of the inner rotor. | 06-05-2014 |