Abstract: A brake booster of positive pressure type includes a valve mechanism to which a positive pressure such as compressed air from a source located externally of a shell is fed for switching a flow path, through a conduit disposed within a constant pressure chamber disposed forwardly of a power piston and a supply passage which is formed in a valve body. The supply passage according to the invention comprised a radial passage which extends radially outward through the valve body from a shank portion thereof, and an axial passage which communicates with the radial passage, which an opening of the radial passage into the peripheral surface of the valve body being closed by a seal member which may be formed of an elastic material such as rubber. The seal member is covered by part of the power piston. This construction permits the supply passage to be formed in an inexpensive manner as compared with a formation of a supply passage which extends obliquely through the valve body.

Abstract: Apparatus associated with a labyrinth seal of a turbo machine for automatically maintaining a desired clearance between lip members and a wear seal of the labyrinth seal over a range of operational states of the turbo machine. The wear seal comprises a first part made of honeycomb material and a second smooth part spaced axially from the first part. An annular carrier supports the wear seal, and a stator supports the carrier, thereby defining between the carrier and the stator an annular chamber having radially outer orifices for admission of an air supply to the chamber. An annular sheet member disposed within the annular chamber has a plurality of holes and is spaced at a small distance from the carrier. Whereas acceleration and deceleration of the turbo machine normally would tend to alter the spacing of the wear seal and the lip members, the structure recited above corrects for this effect, thereby maintaining a desired clearance between the wear seal and the lip members.

Abstract: A retention arrangement for holding an output push rod (70) in a vacuum brake booster (10). The output push rod (70) has a plastic plunger section (36) and a metal insert (70). The plastic section (36) is held in a movable wall of the brake booster by a clip member (46) while the metal insert (70) is held in the plastic plunger (36) by a magnetized rubber seal (50).

Abstract: A master cylinder reservoir includes a cylindrical body having an open upper end. A cap is fitted on and removably secured to the body, the cap engaging the open end of the body at a lower end portion thereof. The cap has a mounting portion formed adjacent to the lower end portion thereof. The mounting portion defines together with the upper surface of the open end of the body a circumferential space. The mounting portion has a first surface disposed in opposed spaced relation to the upper surface of the open end of the body. The mounting portion has a second surface disposed in opposed relation to the outer surface of the upper end of the body. The outer surface of the upper end is spaced from the second surface adjacent to the upper surface of the body to form a circumferential recess. A diaphragm received in the cap and having a peripheral portion received in the circumferential space and held between the first surface of the mounting portion and the upper surface of the open end of the body.

Abstract: In a hydraulic servomechanism having an input shaft positioned within a power piston, a key member provided around the input shaft and cooperating with an annular groove in the power piston, so that required movement of the input shaft during operation of the mechanism is reduced.

Abstract: A face seal between the rotor and stator of a fluid-operated rotory motor is formed by a seal member formed of a low friction material having a low surface coefficient of friction and a low memory and extruded into sealing engagement with an associated part by an elastomeric seal member as the rotor and stator are assembled.

Abstract: A hydraulic brake system for automotive vehicles with a master brake cylinder (51) and with a hydraulic power booster (49) connected upstream of the master brake cylinder, in which a pressure medium pump (18) which may be driven by an electric motor (17) is used for providing an auxiliary hydraulic energy, the drive of which may be switched on by a pressure accumulator (1), on the one hand, and by a brake pedal contact (58), on the other hand, in the unbraked operation of the automotive vehicle the pressure accumulator (1) permanently being kept on a pressure level sufficient for an initial actuation of the brake and the charge of the pressure accumulator (1) being monitored by a pressure control valve (19).

Abstract: A shroud for a gas turbine engine rotor stage is divided into a number of arcuate segments each of which is a trapezium. The segments are urged together by compression springs which attempts to make the assembly lengthen peripherally, by virtue of the chamfered ends 30 of the segments riding up each other. The completely circular shape of the shroud prevents that movement but as a result, a hoop load is generated which tends to move the segments radially outwards, thus achieving the same effect, along with a consequent increase in diameter. A cam ring and pins are used to control and reverse the movement, as desired. The shroud diameter can thus be altered to suit rotor expansion and contraction.

Abstract: A cantilever shaft centrifugal pump including a volute casing and impeller within said casing and mounted on the end of the cantilever shaft. The volute chamber has an inlet coaxial with the axis of the cantilever shaft and an outlet extending tangentially of the wall of said volute casing. The impeller is of the shrouded type having spaced front and rear shrouds opening at the periphery of said shrouds with impeller vanes therebetween. The outer walls of the front and rear shrouds conform to arcs struck from the center of the bearings for the shaft, and the walls of the pumping chamber have clearance with the walls of the front and rear shrouds along arcs struck from the same center as the center of the walls of the front and rear shrouds. This accommodates radial excursions of the impeller and shaft upon large radial thrusts on the impeller and avoids catastrophic contact between the shrouds of the impeller and the stationary surfaces of the pumping chamber.

Abstract: A brake booster for automotive vehicles comprises a low-pressure casing which is sealingly subdivided into a low-pressure chamber and a working chamber by a movable wall. The low-pressure casing is shaped to provide waists in the area of aligned bolts to fasten one end wall of the casing to a master brake cylinder and the other end wall of the casing to the vehicle. The casing has a casing wall section in the area of the waists extending in the axial direction to transmit tractive forces. In addition, tie elements may be provided outside the casing to interconnect the aligned bolts.

Abstract: A pull-type pneumatic booster comprises an elongated plunger received in a body for sliding movement along an axis thereof. A movable member is slidably received in the body and defines a low and a high pressure chamber therein. The high pressure chamber is controlled by a valve device to communicate with either of the low pressure chamber and a high pressure source in accordance with the movement of the plunger. One end portion of the plunger extends beyond the movable member into the low pressure chamber. The plunger has the other end portion of a tubular configuration. The front and rear end portions of the plunger are snugly fitted in and disposed in sliding contact with an inner surface of a tubular portion the movable member for guiding the movement of the plunger along the axis of the body. A load-transmitting means is received in the tubular rear end portion of the plunger for transmitting a reaction force applied to the output member to the input member via the plunger.

Abstract: A tandem master cylinder for an automobile disclosed herein includes a cylinder body having a cylinder bore, a first and a second pistons slidable in the cylinder bore and axially apart from each other, a first and a second power chambers defined, independently from each other, in the cylinder bore by the first and second pistons, and an auxiliary reservoir formed integrally with the cylinder body at its upper side adjacent the first power chamber. The auxiliary reservoir has a first and second reservoir chambers separated from each other by a partition and both connected with a main reservoir. The first power chamber is connected with the first reservoir chamber through a pair of first vent and supply ports. The second power chamber is connected with the second reservoir chamber through an oil passage which is formed in the cylinder body and which uprises in the direction from the latter to the former.

Abstract: A mechanical release arrangement for a fluid-pressure-operated braking cylinder having an emergency brake/parking brake feature includes a cylinder housing having formed therein a brake actuation portion, an emergency portion, an intermediate lever portion, and a coaxially-disposed brake-release arrangement interacting therewith. An actuator piston is movable within one pressure chamber and has a hollow rod portion extending therefrom on which the lever arrangement is secured. An emergency piston is retracted to a release position against the force of a spring arrangement by fluid pressure communicated to an emergency chamber. An extension sleeve extends from the emergency piston and has a first toothed portion formed at one end. A release rod extends through the extension sleeve and has a second toothed portion formed near a reduced diameter end.

Abstract: A control valve (81) for a vacuum brake booster (10) having a sleeve member (96) for positioning a poppet valve (92) in a bore (74) of a hub (28) and defining the limits for a continuous flow path (98) between a first chamber (30) and a second chamber (68) within the hub (28).

Abstract: An improved seal for a generally cylindrical pump case provides an internal seal between the case and the head for preventing the flow of fluid between them. The improved seal includes a flexible annular responsive means attached or unattached to the head and carrying a resilient annular seal member. Increasing pressure within the pump case forces the flexible annular pressure responsive means into engagement against the interior surface of the case preventing extrusion of the resilient annular seal member when the case is pressurized, thus providing a more efficient fluid tight seal.

Abstract: An automatic depth control system is disclosed. The system includes a floating piston hydraulic cylinder in which the floating piston is adjusted as a stop for limiting the travel of the main piston in the cylinder. A depth sensing system is provided to sense the actual depth of a implement tool on which the cylinder is mounted to provide a depth signal indicative of the depth penetration of the tool. A circuit system is provided to receive the depth signal and to control a hydraulic valve system to move the stop piston within the cylinder to adjust the working position of the implement tool. The control system includes an instrument panel having a first display indicating the actual depth of the implement tool and a second display indicating the depth limit settings predetermined by the operator. Further means are provided to monitor the actual depth and compare it to the selected depth setting and thereby correct the position of the floating piston.

Abstract: A cylinder actuator has a cylinder barrel, a piston running axially therein, a piston rod running through a first end plate and a stop for limiting motion of the plunger (made up of the piston and its piston rod) by cooperation with an abutment on the plunger. The maximum extent to which the piston rod may be moved out of the barrel is adjustable. The stop mounted within the cylinder is in the form of a radial projection mounted on a stop rod and able to be adjusted in the axial direction. The stop rod extends from the second cylinder and plate along a coaxial hole in the stop rod. This hole has a part of small diameter adjacent to said second end plate and a part of large diameter remote therefrom, said large and small diameters joining at a radial shoulder in said stop rod, said shoulder forming said abutment. The radial projection is located in the hole part with the large diameter.

Abstract: An actuator (10) tolerant of ballistic damage thereto includes a piston (25) longitudinally reciprocable within a cylinder (15) and connected to a rod (30), the piston comprising a plurality of longitudinally stiff, circumferentially spaced ribs (35) joined by a bulkhead (40) which transfers hydraulic loading to the ribs and readily ruptures in response to impact with an obstruction (45) in the cylinder wall due to for example, ballistic damage to the actuator. The bulkhead carries a sealing ring (60) for sealing leakage around the piston and may be formed integrally with the ribs or separately therefrom and attached thereto as an end cap to the piston. Analogous structure may be employed in a gland (20) for the actuator to accommodate ballistic damage to the rod.

Abstract: The present invention relates to a hydraulic power booster, in particular for the actuation of a master cylinder in an automotive vehicle brake system, wherein there is a booster piston and a brake valve arranged essentially in parallel to the booster piston. In response to an actuating force applied to on a brake pedal, pressure fluid is adapted to be metered into a booster chamber of the hydraulic power booster, the booster chamber being confined by a pedal-operable rod and by the booster piston. In the presence of relatively small actuating forces at the brake pedal, the wheel brakes connected to the working chamber of the master cylinder are supplied with at least the absorption volume required. The booster piston has a projection at the end remote from the pedal extending into a blind-end bore of a master cylinder piston. A hydraulic connection between the blind-end bore and the booster chamber is adapted to be closed by a pedal-operable valve assembly.

Abstract: In the assembly of a master cylinder and an oil-hydraulic booster connected to the rear thereof, the master cylinder has an axial bore consisting of a forward, small-diameter bore section and a rearward, large-diameter bore section and the master cylinder piston in the master cylinder includes a small-diameter section slidably fitted in the small-diameter bore section of the master cylinder and a large-diameter section slidably fitted in the large-diameter bore section thereof. The forward end portion of the piston in the oil-hydraulic booster is formed smaller in diameter than the large-diameter bore section of the maste cylinder and is arranged proximate the large-diameter section of the master cylinder piston in the master cylinder so as to enter the large-diameter bore section of the master cylinder when the booster piston is advanced.