Abstract: A speed sensitive hydraulic pressure reaction device in a rack pinion type power steering device of the type employing a rotary valve. A valve body of the output shaft and the rotary valve forms a sleeve portion so as to integrally rotate around the input shaft. The sleeve portion has a plurality of holes mutually communicating through a ring ditch, and a plunger is slidably disposed in each hole. The input shaft has a plurality of slots which engage with the respective plungers at the outer periphery of the input shaft. Each slot has a bottom and a pair of slant surfaces in a cross section orthogonal to the input shaft. When the center of the plunger is aligned with a center between the pair of slant surfaces, gaps are formed between the plunger and each of the slant surfaces.

Abstract: A power steering system is hydraulically operated to decrease the manual steering force in response to the steering wheel angular displacement. A main pump supplies a first hydraulic fluid to the power steering system to operate the same. The main pump is hydraulically coupled to the power steering system so that the pressure of the first hydraulic fluid is affected by the operation of the power steering system and therefore is indicative of the steering wheel angular displacement. A reaction chamber receives a second hydraulic fluid from a subpump and is hydraulically operated to increase the steering force in proportion to the pressure of the second hydraulic fluid.

Abstract: Disclosed is a rack and pinion mechanism used in a steering device of a vehicle, in which when a pinion is engaged with rack teeth at an axially middle part of a rack bar, the rack bar is supported by supporting surfaces of a support yoke in the form of surface contact. When the pinion is engaged with the rack teeth at a part other than the axially middle part of the rack bar, on the contrary, the rack bar is supported by a rotary bearing mounted on the support yoke. Therefore, when a vehicle runs rectilinearly, the sliding resistance of the rack bar becomes large and the handle is stabilized, while when the vehicle turns, the sliding resistance becomes small and handling is made light because the rack bar is supported by a bearing.

Abstract: Apparatus for controlling a steering force of a handle in an automobile having a power steering system in which a driving shaft of an auxiliary fluid pump for obtaining pressure oil for a hydraulic reaction chamber of the power steering system is made common to a driving shaft of a fluid pump for the power steering system to increase a quantity of discharge and oil pressure of the auxiliary pump. Oil pressure with respect to the hydraulic reaction chamber is controlled by the speed and steering angle of the automobile to obtain a proper steering force.

Abstract: In a handle steering force control mechanism adapted to stabilize steering feeling of a steering handle by imparting hydraulic reaction to a power steering device when the vehicle is travelling at high speed, a hydraulic control apparatus for supplying stabilized pressure oil to the power steering device and a hydraulic reaction chamber. This hydraulic control apparatus comprises a main spool and a sub-spool slidably inserted into the main spool to form a variable throttle whose open area is varied by relative displacement therebetween. This variable throttle, when the vehicle travels at high speed, closes the main valve side by the sub-spool and opens the hydraulic reaction side to increase reaction pressure. When reaction pressure reaches a predetermined value in response to steering pressure, the main spool is displaced by pressure oil to cut the reaction pressure.

Abstract: A rack and pinion steering device which comprises a pinion operatively connected to a steering shaft of a vehicle, a long rod-like rack operatively connected to a steering lever mechanism of wheels of the vehicle, said rack having a group of rack teeth meshed with said pinion, and a spring device in contact with the back of said rack on the side opposite said pinion to resiliently bias said rack against said pinion. Said group of rack teeth includes a first portion close to and a second portion away from a center of said rack lengthwise which portions are defined symmetrically on opposite sides of said center, and said both second portions have a reference pitch line which inclines so as to approach the axis of said rack as it is away from said first portion adjacent thereto, whereby said rack gives rise to a flexure displacement under bending pressure caused by said spring device in connection with the meshed position between the rack and the pinion on said group of rack teeth.

Abstract: Disclosed is a device for controlling the pressure of a fluid supplied to a power steering apparatus in response to the speed of a vehicle. The device is arranged such that in a fluid return passage from the power steering apparatus to a pump, there is provided a throttle valve controlled by the speed of the vehicle, so that the controlled oil pressure is guided to an oil pressure reaction chamber in the power steering apparatus.

Abstract: A tape feeding apparatus having a rotary member for feeding a tape which is drivingly connected with rotary driving means through at least two link mechanisms to be rotated at different speeds and with a phase difference so that one of the link mechanisms for a low speed rotation is set in operation just before another enters its dead point. With this structure, intermittent tape feeding can be effected at a high speed, while allowing quick stopping of the rotary member at a required position.