摘要:
The piston of the generator (6, 8) has a smooth lateral surface and cooperates in sliding sealing engagement with a pair of seals (9a, 9b) fixedly mounted in annular grooves formed in the interior surface of the single bore (2) of the tubular body (1) of the generator. The bore opens at either end of the body and comprises, in its interior surface, at least one longitudinal groove (17) extending over the entire length of the bore, the bore being closed at one end by an obturator element (4) fitted onto the body (1).
摘要:
An electromagnetic valve for controlling a passage for a flow of fluid or for a difference in the pressures between an inlet (48;56) and an outlet (56;48), comprises a body (10;16;46) on which is arranged a solenoid coil (22), a bore (26) in which is slideably mounted valve member (30) progressively displaceable in response to actuation of the solenoid coil (22) between a first position and a second position. The valve member (30) and the body (46) comprises cooperating valve surfaces (54;62) defining the passage. One valve surface (62) has in axial section a variable profile so that the area of the passage, in a radial section is a predetermined function of the intensity of the current applied to the solenoid coil (22).
摘要:
A brake-master cylinder provided to be actuated either by exerting thrust at one end or pulling at the other end and therefore comprising a push member for actuating the primary piston and an assisting rod intended to be pulled and protruding outwardly from one end of the master-cylinder, said piston being fitted to the assisting rod.
摘要:
A power steering mechanism includes a control valve which acts both to control the flow of pressurized fluid to and from a pair of working chambers of the mechanism and as a pressure relief valve to limit the maximum pressure which may be communicated to the working chambers. The valve includes a stack of plane annular discs which are relatively rotatable and arranged coaxially with the control shaft of the steering mechanism. The discs are resiliently biased together and define valve ports and compartments which cooperate to control the flow of pressure fluid dependent upon the relative rotational positions of the discs. Rotation of the control shaft causes rotation of one of the discs relative to the others to correlate the ports and chambers so as to supply pressure fluid to one chamber and to vent fluid from the other chamber. If the fluid pressure within the compartments of the control valve should exceed a predetermined value, the resilient bias holding the discs together is overcome and the discs separate slightly to open communication between the fluid supply ports and the vent ports.Another embodiment of the mechanism includes a linkage arranged to separate the discs and an abutment which cooperates with the linkage when the mechanism reaches either end of its range of travel. The working chambers are incapacitated when the linkage separates the discs so as to prevent damage to the mechanism from a too-high fluid pressure.
摘要:
A hydraulic pressure generator comprises a body in which is formed a bore, at least one piston mounted slidably in the bore, an annular sealing mechanism located in the bore, and the piston being slidable from a rest position during operation of the generator to cooperate with the sealing mechanism and divide the bore into a working chamber connectable by an output passage to a hydraulic actuator. A refill passage is connected to a source of hydraulic fluid. The output passage is formed in part between a first surface fixed in the bore and a second surface formed on a member mounted in the bore.
摘要:
The end zones (11) of the C-springs (9) of the resilient device for the centering and coupling with backlash of first (1) and second (7) coaxial rotary components form lugs (12) extending radially inward in order to cooperate with stop surfaces (15) in the first rotary component (1), and external shoulders (19) in order to cooperate with facing shoulders (18) formed in the inside wall (16) of the second rotary component (7), the shoulders (18) being angularly offset from the stop surfaces (15) and substantially contiguous with the latter in projection onto the median plane (M) of the device in the centered position of the rotary components (1, 7).
摘要:
The system for generating braking pressure, consisting of a pneumatic assistance servomotor (2) mounted so as to overhang on a master cylinder (1) which it actuates by a tubular pullrod component (14) in which extends the control pushrod (11) of the distribution valve (10), incorporates a pre-assembled unitary valve assembly (10) screwed to the end of the tubular pullrod component (14) so as to connect the latter to the movable piston wall (6) of the servomotor, the valve (10) being linked by a cylindrical flexible sealing component (50) to a central annular zone (19) of the front wall (4) of the servomotor casing which is closed by a labyrinth filtering structure (80) with draining means (86).
摘要:
The star-shaped rotor (10) accommodated in a discoid cavity (9) defines first chambers (27) formed in the arms (20) of the rotor and second chambers (26) for receiving fluid under pressure delimited between two adjacent arms of the rotor, the constitutive elements of the stator (3-5) being joined together by fastening means (50) extending through the second chambers (26), the lateral faces of the cavity opposite the stator incorporating passage apertures (32', 33) which have a trapezoidal profile with radial edges coincide substantially with the web zones (31) of the arms of the rotor, the edges of which define with the edges of the apertures adjustable restrictions (250, 280) the first chambers (27) communicating permanently with return passages (38) in the stator.
摘要:
The actuating mechanism comprises a step-up transmission having an input member (8, 9) connected to an actuation control system (13) by means of a hydraulic distributor (12) controlling at least one double-acting hydraulic power-assistance motor, and an output member in the form of a disc-shaped body (6) rotating about an axle (5) in a box (1, 3), the body having a toothed sector (7) intermeshing directly with a pinion (8) of the input member (9) and forming, in the box, the piston means of the power-assistance motor.
摘要:
The hydraulic distributor, more particularly for power steering systems of vehicles, comprises two rotary members (1-3, 9) which are so designed as to form a substantially disc-shaped cavity (8) divided up in at least one pair of working chambers (28) by arms (13, 14) belonging to one (9) of said members (or rotor). These arms cooperate with inlet (18) and outlet (24) ports in the other member (1) (or stator) so as to form control valve means for controlling activation fluid flow supplied from a pressure generating source (26). The rotor (9) has at least one intermediate arm (33) which extends into each of the chambers of the pair of working chambers (28, 43) and which cooperates with fluid passage ports (36) in the stator in order to form additional fluid flow control valve means. The first portion (of zero slope) of the torque/activation pressure curve of the distributor is controlled by the closing edge (41a) of the intermediate arm (33a) oriented towards the arm ( 14) which is associated with the outlet port (24) and also by the closing edge (38) of the arm (14) which is associated with outlet port (24) which closing edge is oriented towards the intermediate arm (33) extending into the preceeding working chamber (28, 43a).