Abstract: A piston for an internal combustion engine has the conventional skirt replaced by top and bottom bearing surfaces spaced apart by a substantial gap of constant width. The top bearing surfaces are connected to the piston crown through the ring band whereas the bottom surfaces are attached to piston bosses by struts. The gap allows the passage of lubricant to the cylinder to ensure adequate lubrication of the bearing surfaces.

Abstract: The distributor comprises a star-shaped rotor (2) arranged between two concentric components which are spaced axially and are fixed in rotation to a second valve portion (60); a C-shaped centering return spring (40) is arranged around the rotor (2) and cooperates, by its facing ends, with a projection (100) of one of the arms (10.sub.1) of the rotor and with adjacent projections of the second valve portion.

Abstract: A reaction mechanism for use in a vacuum brake booster (10). A lever (86) transfers a reaction force from a first plunger (64) into a second plunger (110) to provide an operator with an indication of the output force being produced in response to an input force. A resilient member (118) urges a first connecting member (116) into engagement with the lever (86). When a predetermined input force is applied, the reaction force overcomes the resilient member (118) and thereafter allows the input force to be directly transmitted through a second connecting member (122) and added to the output force.

Abstract: The planar abutment key (11) incorporates in its body portion (18) two flexible fingers (22) extending laterally and angularly in the direction away from the end portion (19) of the key which forms abutment arms (21) for the plunger, each finger (22) ending in a sharp angle (24), the transverse distance at rest between the sharp angles (24) being greater than the transverse width (d.sub.1) of the slot (12) in the hub portion of the assistance piston (1) in which the key (11) is housed.

Abstract: A fluid actuated ram assembly includes a cylindrical barrel and a rear end cap attached to a rear end of the cylindrical barrel. A piston is located within the cylindrical barrel and both the piston and the cylindrical barrel are adapted for relative movement with respect to each other. There is also provided a piston rod having a piston attached to one end portion thereof. There is also provided a bearing member or guide bush located adjacent to the piston which has a central aperture for the piston rod and also one or more longitudinal passages communicating with the piston. There is also provided a front end cap releasably attached to the cylindrical barrel which has a fluid port communicating with the one or more longitudinal passages of the bearing member or guide bush.

Abstract: An input shaft and an output shaft can rotate relative to each other. Pressure supplied to a pressure-responsive actuator depends on the axial position of a movable valve member. A transmission arrangement serves to move the valve member only in the axial direction as the input and output shafts rotate relative to each other. The valve member and each of the input and output shafts are wholly outside one another.

Abstract: A pull-type booster for a vehicle includes a main body having an internal space; a movable body including a head portion and a cylindrical portion formed integrally with the head portion, the head portion being arranged in the internal space and partitioning the internal space into a lower pressure chamber at one side and a control chamber at another side, and the cylindrical portion projecting from the main body at the other side; a through hole formed in the movable body; a pull input rod extending across the low pressure chamber and projecting through a seal member from the main body at the one side; a plunger arranged slidably in the through hole and combined with a head portion of the pull input rod; a valve member arranged in the through hole and operated by the plunger for generating pressure difference between the lower pressure chamber and the control chamber and moving the movable body in the direction of the lower pressure chamber, a power transmission assembly arranged in an opening end portion of

Abstract: A pull-type booster for a vehicle includes a main body having an internal space; a movable body including a head portion and a cylindrical portion formed integrally with the head portion, the head portion being arranged in the internal space and partitioning the internal space into a lower pressure chamber at one side and a control chamber at another side, and the cylindrical portion projecting from the main body at the other side; a through hole formed in the movable body; a pull input rod extending across the lower pressure chamber and projecting through a seal assembly from the main body at the one side; the seal assembly including a seal member fixed to the main body at its outer circumferential portion and fitted to the pull input rod at its inner circumferential portion; a more flexible portion formed between the outer circumferential portion and the inner circumferential portion in the seal member; a plunger arranged slidably in the through hole and combined with a head portion of the pull input rod; a

Abstract: A yarn false twisting apparatus is disclosed which comprises a pair of rotating circular discs having cooperating friction surfaces for engaging a running yarn at a twisting zone. A pressure applying member is positioned to apply a biasing force to the rear surface of one of the discs locally at the twisting zone, and the pressure applying member comprises a receptacle slideably mounting a piston which extends from the end of the receptacle to engage the disc. The receptacle is eccentrically mounted to permit selective positioning of the biasing force with respect to the yarn path of travel. The discs are mounted on pivotal rocking arms whereby the ratio of yarn twist to yarn speed may be adjusted, and an eccentrically mounted pin provides closely controlled adjustability for the arms and thus the twist ratio.

Abstract: A brake actuating master cylinder unit for bicycles and the like comprising a unit mountable upon the handlebars of a bicycle, a master cylinder having a piston mounted therewithin, a bellofram secured to the inner surface of the master cylinder at one end thereof and at the piston engaging closed end thereof secured to the piston by means of a plurality of projecting tits extending through complementary apertures in the piston. A snap ring preferably is used to positively secure the tits with the piston. A two-part piston rod is employed between the piston and the brake actuating handle to allow same to return to the normal, non-actuated position freely and without withdrawing the piston therealong. This two-part slidable connection permits positive actuation of the piston during braking operation, but yet permits free separation and non-positive return upon completion of the brake actuation.

Abstract: The invention relates to a control device for a moving member such as a flap (20) under the control of an actuator (24a) which is supplied with fluid under pressure and connected to an exhaust by means of a slide valve (10a) which includes three elements (12a, 14a, and 15a) one of which moves with the flap (20a), another of which is movable under manual control (30a), and the third of which is fixed and forms the connection to a source of fluid under pressure and to the exhaust. The invention may be used, in particular, for controlling the flaps in an installation for heating or for air conditioning the cabin of a motor vehicle.

Abstract: An improved sequence-and-relief valve comprises a housing (60), a plurality of conduits (42/44, 46, 53) opening into a bore (62) within the housing, a valve cartridge (64) with the bore, the valve cartridge having a central bore (66) in which a valve element (76) may be moved into and out of contact with seat (74) to control flow from a cylinder port (70) to a tank port (72) in response to changes in pressure acting at pump port (68) or at cylinder port (70). See FIG. 2.

Abstract: The distributor comprises a primary rotating member having a prolongating portion (11) surrounding coaxially the primary rotating member (5) and forms a seat for at least a C-shaped rection spring (27) the ends of which (48) resiliently been upon a radial finger (37a) secured to the primary member and cooperate in engagement with aperatures (43a) formed in the prolongating portion (11) of the secondary member, thus forming a lost-motion coupling between the two members.

Abstract: A brake booster of tandem type includes a valve body, a rear power piston, a front power piston and a centerbody slidably extending through a centerplate which is centrally disposed within a shell, all of which are integrally connected together by utilizing a hub. An end of the hub located adjacent to the valve body is formed with an engaging portion which extends radially outward, while the shank portion of the valve body is formed with an axial groove which permits the engaging portion to pass there through and is also formed with an engaging recess circumferentially displaced from the axial groove and receiving the engaging portion. The engagement between the engaging portion and the engaging recess allows the hub to be assembled with the valve body while preventing the withdrawal of the hub forwardly from the valve body and also preventing the relative rotation therebetween, all with a greatly simplified construction.

Abstract: A pulsation limiter for a manually actuated hydraulic valve includes a spring biased, motion retarding plunger in an auxiliary bore within the valve housing and having a helical groove disposed on its periphery abuts against the input sleeve during the initial portion of its travel to actuate the brakes, a check valve in the plunger allowing filling of the expanding cavity in the auxiliary bore behind the motion retarding plunger. When the brake pedal is released partially or completely, the input sleeve moves until it abuts against the plunger. Thereafter, the pressure buildup in the auxiliary bore cavity closes the check valve in the plunger and the input sleeve can only move relatively slowly back to its initial position as the fluid trapped in the auxiliary bore cavity exits through the helical groove.

Abstract: Fluid actuation device with compensation for wear, particularly for friction clutch mechanisms of the type having a cylinder in which there are placed a first piston resting on a spring and a second piston extended by a declutching control rod, and in which the space between the pistons is filled with an incompressible fluid. The cylinder carries a separation wall between two compartments which house respectively the first and the second pistons. An orifice for communication between said compartments carried by the separation wall is associated with a stopper valve rigidly connected to a membrane that is subjected to a pressure for control and transmission of a thrust force on the cylinder and for driving the control rod.

Abstract: A work cylinder having a piston of single-body construction and a cushioning arrangement integrally formed on the piston includes a cylinder housing having a chamber formed therein divided into first and second work chambers by the piston. First and second piston extensions extend into first and second graduated chamber portions formed at opposite ends of the cylinder housing. A sealing material, bonded to the exterior surface of the piston, exhibits a dual cup-shaped piston seal around the center portion and annular cushion seals on the piston extensions. The cushion seals are at an angle such that, when in contact with a first chamber reduction, a seal results. Additionally, in the opposite direction, the cushion seals act as a check valve whereby fluid pressure introduced to a second chamber reduction depresses the cushion seals and flows into the selected work chamber.

Abstract: An improvement in a known power steering system of the type in which movement of a steering wheel is transmitted via a torsion bar to an oil path switching valve to actuate a power cylinder in a desired steering direction by switching a high pressure oil path extending from an oil pump to the oil path switching valve and a low pressure oil path extending from the oil path switching valve to an oil tank. A part of the working oil flowing through the high pressure oil path is led to a reaction piston to restrain torsion of the torsion bar.

Abstract: The invention concerns a hydraulic amplifier for a braking system incorporating a body (10, 110), a first component (18, 124) capable of being displaced in the body (10, 110) under the effect of the operation of a brake pedal, between a first position causing a first chamber (16), joined to a braking circuit, to communicate with a low pressure reservoir (44, 138), and isolating this chamber (16) from a high pressure source (32, 130), and a second position isolating the chamber (16) from the low pressure reservoir (44, 138) and causing it to communicate with the high pressure source (32, 130), characterized in that it incorporates a second chamber (12, 112) formed in the body (10, 110), a circuit (42) causing this second chamber (12, 112) to communicate with the low pressure reservoir (44, 138), and a valve means (34, 116) responsive to the pressure of the high pressure source (32, 130) normally closing this circuit under the effect of the pressure of the high pressure source (32, 130).

Abstract: A braking unit for vehicles is disclosed which includes a housing in which slides a piston that can be displaced by means of a pressurized fluid to control, by means of an actuator, a thrust rod which controls a brake shoe. The actuator includes at least one pair of coaxial rollers supported so that they can revolve around a pin, supported by a pair of legs, which is connected to the piston and displaced in rolling contact with inclined surfaces of the thrust rod.