Kayaba Industry Company, Ltd.

Tsunefumi Arita

Noboru Shimizu

Naoto Shima

Masashi Takai

Hideyasu Ihira

Tetsuji Hayashi

Shiroh Suoh

Satoshi Takahara

Hisashi Tsuda

Fumio Ikesugi

The flow control device comprises a supply passage () for supplying hydraulic fluid discharged by a pump () to a power steering output section (); a variable throttle section () situated at an intermediate position of the supply passage (); and a flow control valve () for returning the hydraulic fluid in the supply passage () to the pump inlet side, in accordance with a pressure differential between upstream and downstream of the variable throttle section (). When the pump () is halted, the flow control valve () is impelled by a spring () and closes the variable throttle section (). A throttle passage () is provided for connecting the upstream side and the downstream side of the variable throttle section with the supply passage ().

Flow control for power steering

A steering speed-computing section () to differentiate a steering angle of a steering wheel from a steering angle sensor () to compute the steering speed signal, a low-pass filter () to cut high frequency components in the steering speed signal to output a correction steering speed signal, a switching section () to switch the cut-off frequency in the low-pass filter to be higher at the time of determining a high-speed steering condition, and a flow quantity-computing section () to compute a target flow quantity supplied to a power steering output section () based on the steering angle signal and the correction steering speed signal are provided to control a flow quantity of an operating oil supplied to the power steering output section () for the target flow quantity.

Power steering system

A main bodyof a component comprises a projectionprotruding from an axis thereof in the direction of a normal, a fitting shaft portionto be fitted into an openingof a structure, and a mounting plate portionincluding a bolt inserting holeto mount and fix the main bodyto the structure. The mounting plate portionis formed with a notched groovecommunicating with the bolt inserting hole. The mounting plate portionis fixed with a tightening boltwhich is screwed in the structure

Mounting structure and method of mounting a component in a structure

A power steering system capable of giving a driver no discomfort even when an incoming current instruction value sharply decreases. The power steering system comprises a controller C for determining a solenoid current instruction value SI on the basis of a current instruction value Iin accordance with a steering angle supplied from a steering angle sensor, a current instruction value Iin accordance with a steering angular velocity, and a current instruction value in accordance with a vehicle speed. The controller C comprises a delay control section for reducing the rate of decrease only when the incoming current instruction value sharply decreases and outputting the resulting current instruction value.

A power steering system capable of preventing an unnecessary standby flow produced in high speed travel. A controller C determines a basic current instruction value Id based on a current instruction value I1 in accordance with a steering angle detected by a steering angle sensor, a current instruction value Iin accordance with a steering angular velocity and current instruction values I, Iin accordance with a vehicle speed, and adds a standby current instruction value Is to the basic current instruction value Id, and outputs the resultant value of the addition as a solenoid current instruction value SI, and changes the standby current instruction value Is on the basis of the vehicle speed.

Provision of a power steering system which is capable of preventing a delay in response for outputting a solenoid current instruction value SI. A controller C stores a table of basic current instruction values I corresponding to combinations of steering angles and steering angular velocities. The controller C obtains a basic current instruction value I from the table, and multiplies the obtained basic current instruction value I by a current instruction value I determined on the basis of a vehicle speed, and then determines the multiplied value as a solenoid current instruction value SI.

A power steering device capable of improving both operability of a vehicle and a feeling of the steering. The power steering device includes an association mechanism for mechanically associating a handle with wheels, a power cylinder for generating assisting force, and a control valve connected to the power cylinder and adapted to be changed over depending on torque inputted thereto from the handle and kept at a neutral position unless the torque is inputted thereto. The control valve functions to control the amount of fluid fed to the power cylinder when it is changed over and close a cylinder port connected to the power cylinder when it is at the neutral position.

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Tokyo, Japan

Tsunefumi Arita