| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 418030000 | By cylinder or cylinder portion pivotal movement | 8 |
| 20090291008 | VARIABLE DISPLACEMENT VANE PUMP - [Task] To provide a variable displacement vane pump that assuredly suppresses seizing of mutually contacting surfaces of a pressure plate and a rotor. | 11-26-2009 |
| 20100034681 | Variable capacity vane pump - A variable capacity vane pump ( | 02-11-2010 |
| 20100086424 | DIRECT CONTROL VARIABLE DISPLACEMENT VANE PUMP - A lubrication system for a power transmission device includes a variable displacement vane pump including a moveable control ring for varying the displacement of the pump. A linear actuator directly acts on the control ring for moving the control ring between maximum and minimum pump displacement positions. The linear actuator includes an electric motor for rotating a drive member. The drive member engages a driven actuator shaft to cause linear translation of the actuator shaft in response to rotation of the drive member. A control system includes a controller for signaling the actuator to extend or retract the actuator shaft to vary the pump displacement. | 04-08-2010 |
| 20100119396 | VARIABLE DISPLACEMENT DUAL VANE PUMP - The present invention is a variable displacement pump having an inner rotor rotatable about a first axis and having at least two slots. The pump also has at least two vanes, each located in a distinct one of the at least two slots. The pump also has an outer rotor rotatable about a second axis, operably associated with the inner rotor, the outer rotor having two or more recesses, each configured to receive one of the vanes. The pump also includes an expandable chamber formed by the outer rotor and the inner rotor, an eccentric ring surrounding the outer rotor, and a housing. The eccentric ring is located within the housing for adjusting the relative relationship between the first axis and the second axis in order to vary the displacement of the pump. | 05-13-2010 |
| 20100322807 | PUMP APPARATUS - A pump apparatus includes a pump housing; a drive shaft; a pump element; a cam ring arranged to vary an inherent discharge amount based on the eccentric amount of the cam ring; a steering state sensing section configured to sense or estimate a steering angle, a steering angular speed or a steering angular acceleration, and to output the steering angle, the steering angular speed or the steering angular acceleration as a steering state sensing signal; and a solenoid configured to be controlled to suppress the eccentric amount of the cam ring so as to decrease the inherent discharge amount with respect to the steering state sensing signal when the vehicle speed is equal to or greater than a first predetermined vehicle speed, relative to the inherent discharge amount when the vehicle speed is smaller than the first predetermined vehicle speed. | 12-23-2010 |
| 20130121863 | ADJUSTABLE VANE PUMP FOR REDUCING PRESSURE PULSATIONS DURING DISCHARGE - An adjustable rotary vane pump configured to reduce pressure pulsations during hydraulic fluid discharge includes a housing having two side plates positioned in parallel. Each side plate has multiple grooves formed in its surface. A rotor mounted between the side plates has multiple vanes extending radially outward. A lift ring surrounds the rotor, pivotally connected to the housing to swivel between positions eccentric to the housing. During rotation of the rotors, the vanes divide the annular region between the rotor and the lift ring into multiple cells, which alternately position themselves between a suction zone and a pressure zone of the pump. In a transition region between the suction and pressure zone, when the lift ring is between pre-determined angular positions, the grooves within lift ring and the side plate substantially align to create an overflow channel, which transfers the hydraulic fluid from the suction zone to the pressure zone. | 05-16-2013 |
| 20140119969 | VANE PUMP - A vane pump includes a vane cam mounted in a recess of a rotor, and configured to move with eccentricity with respect to an axis of rotation of the rotor. A cam port is formed in a surface of a pump body facing the vane cam, and configured to hydraulically communicate with the recess of the rotor. The vane cam includes an outer peripheral surface configured to contact a proximal end of each of vanes, and configured to cause projection of the vanes along with rotation of the rotor. The vane cam hydraulically separates the proximal end portion of a first slot in a suction region from the proximal end portion of a second slot in a discharge region. | 05-01-2014 |
| 20140248171 | VARIABLE DISPLACEMENT PUMP HAVING ROTATING CAM RING - Vane pump mechanical losses are reduced by removing vane friction losses and replacing them with lower magnitude journal bearing fluid film viscous drag losses. A freely rotating cam ring is supported by a journal bearing. A relatively low sliding velocity is imposed between the cam ring and the vanes). This permits the use of less expensive and less brittle materials in the pump by allowing the pump to operate at much higher speeds without concern for exceeding vane tip velocity limits. | 09-04-2014 |
