PUMP APPARATUS
First Claim
1. A pump apparatus arranged to supply a hydraulic fluid to a steering apparatus for a vehicle, the pump apparatus comprising:
- a pump housing including a pump element receiving portion;
a drive shaft rotatably supported by the pump housing;
a pump element received within the pump element receiving portion of the pump housing, and arranged to suck the hydraulic fluid by being rotated by the drive shaft, and to discharge the sucked hydraulic fluid;
a cam ring disposed within the pump element receiving portion radially outside the pump element, and arranged to be moved so that a center of cam ring is eccentric to a center of the drive shaft, and to vary an inherent discharge amount which is a discharge flow rate per one rotation of the pump element, 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 be driven in accordance with a variation of a current amount controlled in accordance with the steering state sensing signal and a vehicle speed, and to control the eccentric amount of the solenoid, the solenoid being 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.
2 Assignments
0 Petitions
Accused Products
Abstract
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.
13 Citations
13 Claims
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1. A pump apparatus arranged to supply a hydraulic fluid to a steering apparatus for a vehicle, the pump apparatus comprising:
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a pump housing including a pump element receiving portion; a drive shaft rotatably supported by the pump housing; a pump element received within the pump element receiving portion of the pump housing, and arranged to suck the hydraulic fluid by being rotated by the drive shaft, and to discharge the sucked hydraulic fluid; a cam ring disposed within the pump element receiving portion radially outside the pump element, and arranged to be moved so that a center of cam ring is eccentric to a center of the drive shaft, and to vary an inherent discharge amount which is a discharge flow rate per one rotation of the pump element, 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 be driven in accordance with a variation of a current amount controlled in accordance with the steering state sensing signal and a vehicle speed, and to control the eccentric amount of the solenoid, the solenoid being 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A pump apparatus arranged to supply a hydraulic fluid to a steering apparatus for a vehicle, the pump apparatus comprising:
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a pump housing including a pump element receiving portion; a drive shaft rotatably supported by the pump housing; a pump element received within the pump element receiving portion of the pump housing, and arranged to suck the hydraulic fluid by being rotated by the drive shaft, and to discharge the sucked hydraulic fluid; a cam ring disposed within the pump element receiving portion radially outside the pump element, and arranged to be moved so that a center of cam ring is eccentric to a center of the drive shaft, and to vary an inherent discharge amount which is a discharge flow rate per one rotation of the pump element, 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 be driven in accordance with a variation of a current amount controlled in accordance with the steering state sensing signal and a vehicle speed, and to control the eccentric amount of the solenoid, the solenoid being configured to control 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 a steering frequency per unit of time is smaller than a predetermined value, relative to the inherent discharge amount when the steering frequency is greater than the predetermined value.
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13. A pump apparatus arranged to supply a hydraulic fluid to a steering apparatus for a vehicle, the pump apparatus comprising:
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a pump housing including a pump element receiving portion; a drive shaft rotatably supported by the pump housing; a pump element received within the pump element receiving portion of the pump housing, and arranged to suck the hydraulic fluid by being rotated by the drive shaft, and to discharge the sucked hydraulic fluid; 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 drive in accordance with a variation of a current amount controlled in accordance with the steering state sensing signal and a vehicle speed, and to control a supply amount of the hydraulic fluid to the steering apparatus of the vehicle, the solenoid being configured to control to decrease the supply amount of the hydraulic fluid 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 supply amount of the hydraulic fluid when the vehicle speed is smaller than the first predetermined vehicle speed.
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Specification