Abstract: A hydraulic booster for a vehicle and more particularly an improved hydraulic booster with improved brake-relieving action, among other improvements.

Abstract: A railroad car brake system, comprising, a pneumatic-to-hydraulic transducer connected to a brake control unit for developing braking pressure in response to a brake command request, and a plurality of disc brake units connected to the pneumatic-to-hydraulic brake pressure transducer and being characterized by the fact that the disc brake units are divided into high speed disc brake units and low speed disc brake units and a control valve is installed between the brake pressure transducer and the disc brake units so that the pressurized fluid may be supplied from the brake pressure transducer either to the high speed disc brake units, or to the low speed disc brake units.

Abstract: An electromagnetic valve control system employing a controller circuit for controlling the position of a pneumatic valve by regulating the magnetizing current provided to the electrical solenoid by establishing a first magnetizing current set point when the valve is to be moved from a release position to a lap position and by establishing a second magnetizing current set point when the valve is to be moved from an application position to a lap position.

Abstract: A braking system for a vehicle which includes a master cylinder, and a wheel cylinder for braking a wheel with a brake fluid pressure supplied from the master cylinder. A pulsating-pressure absorbing apparatus is arranged between the master cylinder and the wheel cylinder. The pulsating-pressure absorbing apparatus includes a main body, an inlet formed in the main body and connected to the master cylinder, an outlet formed in the main body and connected to a side of the wheel cylinder, and a stepped hole formed in communication with the inlet and outlet. A stepped plunger is slidably fitted into the stepped hole, and a check valve is arranged in a path defined within the plunger for permitting brake fluid to flow from the inlet towards the outlet and for inhibiting brake fluid from flowing from the outlet towards the inlet.

Abstract: In a fluid pressure control apparatus for a vehicle which includes a main body in which an input opening is formed in communication with a master cylinder side and an output opening is formed in communication with a wheel cylinder side, a stepped bore made in the main body, in communication with the input opening and output opening; a stepped piston slidably fitted into the stepped bore, a poppet type movable body for limiting fluid flowing from the wheel cylinder side towards the master cylinder side in response to a predetermined length movement of the stepped piston; a path for connecting the input opening side of the stepped piston with the output opening side of the stepped piston; and a valve for closing the path in response to a movement longer than the predetermined length.

Abstract: There is disclosed a liquid-operated booster having a jump-up function, in which the production of an internal pressure in a reaction force chamber in accordance with a reduction of the volume of the reaction force chamber is prevented. To achieve this, a mechanism for relieving the reduction of the volume of the reaction force chamber due to a relative movement of a piston and an input member toward each other is provided at a position facing the reaction force chamber. Most preferably, this relieving mechanism is constituted by a movable small piston provided at the side of an operating input.

Abstract: A control valve device for a railway car having an arrangement for changing the axial position of a variable area piston in order to adjust the output pressure of a piston valve assembly in accordance with a high or low speed of the railway car. The axial position of a supply valve seat is set in accordance with a high or low speed signal to in turn set the axial posiiton at which the piston assembly, including the variable area piston, assumes a lap condition.

Abstract: A variable load valve device for a railway car having an arrangement for changing the axial position of a variable area piston in order to adjust the output pressure of piston valve assembly in accordance with different load weights of the railway car. The axial position of a supply valve seat is set in accordance with a load weight signal to in turn set the axial position at which the piston assembly, including the variable area piston, assumes a lap condition.

Abstract: A pump apparatus includes a plunger, an eccentric cam for moving the plunger toward a pressure chamber, a drive shaft supporting the eccentric cam, and an output shaft of a motor for imparting a rotational force to the drive shaft. A convex portion is formed on one end of one of the drive shaft and the output shaft whereas a concave portion is formed in one end of the other of the two shafts. The convex portion is fitted in the concave portion to interconnect the drive shaft and the output shaft. The convex portion is fitted in the concave portion with a clearance therebetween. A holder member for always holding the convex portion and the concave portion in engagement with each other in the direction of rotation of the drive shaft is provided at an area of fitting between the convex portion and the concave portion. With this arrangement, noises resulting from the impingement of one of the convex portion and the concave portion upon the other during the operation of the pump apparatus are eliminated.

Abstract: A load compensation control valve for an air brake system for railway vehicles having air springs for producing control pressures proportional to the load sustained by the given vehicle. The load compensation control valve includes a supply chamber, an output chamber, a supply vlave, a supply valve seat, an exhaust valve rod, a balance piston, and an adjusting mechanism for controlling the pressure in the output chamber in accordance with the level of the control pressures.

Abstract: A tube seat installation device having a piping connecting part of a special coupling joint being attached on one side of the input piping opening or the output piping opening of the fluid pressure valve while at the same time having a cylindrical part of the special coupling joint fitted into a connecting hole of the tube seat via an O-ring sealing element. The piping connecting part of the special coupling joint is attached to the other side of an outlet piping opening or an inlet piping opening. The cylindrical part is fitted into the introduction part of the hollow body via an O-ring sealing element, or the introduction part of the hollow body is attached to the piping opening via an O-ring sealing element. A flange part of this hollow body is faced and fixed to another connecting hole of the tube seat via O-ring sealing element to which a fluid pressure valve is fixed by being sandwiched by the hollow body.

Abstract: In a mechanical component, a component body includes an opening, a first bore located at the opening and having a diameter of D.sub.1, and a second bore located on the opposite side of the first bore from the opening and having a diameter of D.sub.2, where D.sub.1 is larger than D.sub.2. A step is formed through which the first and second bores are connected to each other. An annular dish-shaped plate is urged against the step of the component body until the dish-shaped plate is deformed into a planar-plate configuration, to bite an outer periphery of the dish-shaped plate to a periphery of the first bore. Thus, an annular element formed by the dish-shaped plate is fixedly mounted to the component body. If the above-mentioned support structure is applied to a valve spring of a hydraulic pressure control valve, it is possible to surely stabilize the support of the valve spring.

Abstract: In a hydraulic pressure control valve for use with a master cylinder, a valve chamber is formed at an attaching section of a valve body. An annular recess is formed in the valve body at a location of an end of the stepped bore, which opens to the valve chamber. A valve element is arranged within the valve chamber for movement therewithin. The valve element has a stud which extends to an interior of the master cylinder and which receives, from the piston within the master cylinder, such a force as to cause the valve element to fall down. An annular preventing element is formed separately from the valve element and the valve body. The preventing element is arranged between the valve element and the end of the stepped bore, which opens to the valve chamber. The preventing element substantially covers an annular end of the annular recess, which opens to the valve chamber, for preventing a seal element from coming out of the recess, which is arranged therewithin.

Abstract: A flow control device includes a control valve having a discharge line to be connected to a hydraulic motor, a supply line to be connected to a hydraulic pump, a first bleed-off control passage having a line connected to a tank, and a second bleed-off control passage having a line connected to the tank through a secondary control valve, a flow dividing valve provided in the supply line and having a first position for allowing a first desired flow of oil discharged from the hydraulic pump and a second position for allowing a second desired flow of the oil, and a selector valve operable for the secondary control valve and the flow dividing valve and having a first selection position for closing the secondary control valve and shifting the flow dividing valve to the first position and a second selection position for opening the secondary control valve and shifting the flow dividing valve to the second position.

Abstract: A filter arrangement for a moisture-removal device used in compressed air systems in which an inner filter adapted to remove water from the air is encircled by an outer filter that is adapted to remove oil from the air. A space between the inner and outer filters is provided to accommodate accumulation of the filtered-out oil with a valving arrangement provided in the area of oil accumulation that is operative in response to a pressure differential when the regeneration phase of operation is initiated to concurrently discharge the accumulated oil.

Abstract: In a compressed-air dryer, a base has formed therein a recess at the other end thereof. An inlet port is connected to an air compressor and communicates with the recess. An outlet port is connected to an air reservoir. Air after having passed through a desiccant container is discharged to the air reservoir through the outlet port. An oil-mist separator has one end thereof communicating with the inlet port through the recess. The other end of the oil-mist separator communicates with the desiccant container. The oil-mist separator is received within a tubular section of the base and cooperates with the tubular section to define a transport cavity therebetween. The inlet port communicates with the oil-mist separator thorugh the transport cavity and the recess.

Abstract: A plastic piston of master cylinder has a first member having a small diameter portion and a second member having a large bore portion. Excess welding resin is prevented from being leaked into a seal ring mounting groove formed on a part of the outer peripheral surface of the small diameter portion by provision of welding portions in the form of a space defined between an outer peripheral surface of the small diameter portion of the first member and the large bore portion of the second member, and a gap defined between a tip end of the small diameter portion of the first member and the bottom of the large bore portion, the space and gap being provided respectively for preventing the excess welding resin from being leaked into the seal ring mounting groove. The plastic piston has no parting lines along the seal ring mounting groove which results in achieving a superior seal effect.

Abstract: A tread brake unit including a spring actuated compensating mechanism for maintaining the brake unit piston stroke constant. A roller associated with the compensating mechanism is adapted to ride along an operating surface of a lever arm that rotates according to the degree of piston stroke. The profile of this operating surface regulates the roller movement to prevent the stressing of operating springs in the compensating mechanism from exceeding a maximum value corresponding to their fatigue limit.

Abstract: In a hydraulic pressure control valve for use with a brake master cylinder, a hollow body of one-piece structure has an internal stepped bore through which outlet and inlet bores formed respectively in one and other ends of the body communicate with each other. A mounting portion to the master cylinder is provided adjacent the other end of the body. A piston is arranged in the stepped bore for reciprocative movement therealong in response to hydraulic pressure from the master cylinder. One end of the piston remote from the outlet bore has an end face serving as a valve seat. A substantially tubular cap element is arranged in the inlet bore and supports the one end of the piston. The cap element is fixed to the body by fixing arrangement which is accompanied with no relative rotation between the cap element and the body.

Abstract: A lock system for a pipe joiner device is disclosed having a fixed-side connector block provided with at least a connector and a moving-side connector block provided with another connector for engagement with and disengagement from the foregoing connector, in which as the piston rod of a single actuator cylinder advances forward, lock levers mounted to the moving-side connector block moves forward into a connection opening formed in the fixed-side connector block and also, the positional relation between pin members fixedly mounted on the lock levers and L-shaped guide slots provided in a dog which is supported by the forward end of the piston rod for forward and backward movement varies thus to extend toggle links joined between the front ends of the lock levers and the forward end of the piston rod, so that hook portions formed on the front ends of their respective lock levers can engage with a connecting opening end area of the fixed-side connector block to join the moving-side connector block with the fix