Topic
Gear pump
About: Gear pump is a research topic. Over the lifetime, 7490 publications have been published within this topic receiving 38837 citations. The topic is also known as: Gear pump.
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Patent•
31 Dec 1993
TL;DR: In this article, a hydraulic drive system for actuating a reciprocating member such as a polished rod in a pump jack device, and for acting as a counterbalance and/or for energy conservation is presented.
Abstract: A hydraulic drive system for actuating a reciprocating member such as a polished rod in a pump jack device, and for acting as a counterbalance and/or for energy conservation. The system has two hydraulic circuits and a prime mover. A first circuit includes a cylinder for driving an output member which may be connected to the polished rod, a first pump of the variable displacement, reversible flow type, together with a pair of fluid lines forming with the cylinder a closed-loop circuit. A controller is programmed to control the setting of the first pump so as to establish the velocity profile of the output member. A second hydraulic circuit is also in the form of a closed-loop containing first and second pumps, at least one of which is of the variable displacement type and is also controlled by the controller. The second and third pumps at least are of the pump/motor types, and the third pump has an input/output shaft connected to a flywheel so that as the third pump is driven as motor, it increases the speed of the flywheel. However, when the second circuit is controlled so that the second pump functions as a motor and the third pump functions as a pump, energy is extracted from the flywheel so that its RPM decreases. The first pump is driven by the prime mover, and the second pump, which can drive the first pump when it is functioning as a motor, may alternatively be driven by the prime mover as well or by both the prime mover and the first pump, if the latter functions as a motor, such as during the down stroke of the polished rod.
26 citations
Patent•
22 Nov 1985
TL;DR: In this article, a system and method for controlling a continuous mixer having a gear pump discharge or an extruder screw discharge is described, where the discharge of this material through the mixer is controlled by the gear pump, and the RPM of the pump gears is controlled in relation to the torque produced by the motor which drives the bladed rotors.
Abstract: Disclosed is a system and method for controlling a continuous mixer having a gear pump discharge or an extruder screw discharge. The continuous mixer, which includes a charging orifice spaced apart from a discharge orifice, feeds material fed through the charging orifice through a melter/mixer. The material is caused to move through a chamber by one or more bladed rotors which are controlled by a motor. The discharge of this material through the mixer is controlled by the gear pump, and the RPM of the pump gears is controlled in relation to the torque produced by the motor which drives the bladed rotors. A change in torque produced by this motor will result in a change in the RPM of the pump gears, thereby maintaining the rotor torque and consequently the mixing energy exerted on the material being mixed in the mixer.
26 citations
Patent•
14 Dec 1992
TL;DR: In this article, a ring gear pump with internally toothed ring gear meshing with a pinion having only one tooth less was used to reduce the noise in a gear-type machine.
Abstract: In a gear-type machine, in particular in a ring gear pump with internally toothed ring gear meshing with a pinion having only one tooth less, for reducing the noise the pinion teeth are only half as wide as the internally toothed ring gear teeth and the cycloids are flattened in order to ensure adequate free passage of the teeth heads opposite the point of deepest teeth engagement in spite of minimum clearance.
26 citations
Patent•
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18 Nov 1997
TL;DR: In this paper, a wheel braking system comprises a motor driven gear pump, a relief line connecting the pump discharge to the pump intake, a wheel brake unit connected to pump discharge and a flow restriction in the relief line.
Abstract: A wheel braking system comprises a motor driven gear pump, a relief line connecting the pump discharge to the pump intake, a wheel brake unit connected to the pump discharge, and a flow restriction in the relief line. A control unit controls the motor for the pump in response to an output signal of a brake pedal sensor. The brake pedal sensor generates the output signal indicative of the brake pedal stamping force. The control unit determines a desired motor speed for the sensed brake pedal stamping force and operates the motor.
26 citations
Patent•
16 Dec 1975
TL;DR: In this paper, an electronic means senses the difference in rotational speed between a main shaft gear to be engaged and the main shaft, and actuates a friction disc assembly to connect the low gear to the primary shaft to accelerate the countershaft and thus the gear.
Abstract: An electronic means senses the difference in rotational speed between a main shaft gear to be engaged and the main shaft, and actuates a friction disc assembly to connect the low gear to the main shaft to accelerate the countershaft and thus the gear to be engaged if the gear speed is lower than the main shaft speed, and to connect the first gear to the transmission casing to decelerate the countershaft and thus the gear if the gear speed is higher than the main shaft speed, shifting from neutral into the desired gear ratio is prevented until the gear and main shaft speeds are synchronized.
26 citations