Abstract:
A system for connecting two parts (1, 2) by means of a pin (7) positioned axially in recesses in said parts. The pin (7) and one of the recesses (10) have a non-circular cross section, and the pin (7) is held by the force of a spring wire (11) to reduce its play in said recess (10).
Abstract:
The present invention relates to an assembly comprising a bulkhead (10) separating the engine compartment from the passenger compartment and a pneumatic servomotor (12) for assisting braking of the vehicle and comprising essentially a passage wherein is introduced a control rod (16) actuated by a brake pedal in the passenger compartment and a closed casing defining pneumatic chambers of the servomotor in the engine compartment. According to the invention, the passage (14) is integral with a collar (18) whose diameter is substantially smaller that that of the orifice; the collar (18) is so conformed as to present at least partially an end wall (20) parallel to the bulkhead; the collar (18) has a peripheral groove wherein is housed a ring (22); the ring (22) has at least partially one elastic edge (24) projecting outwards. Thus, when the servomotor is in position in the orifice, the end wall (20) of the collar bears against the face of the bulkhead (10) in the engine compartment and the elastic edge (24) of the ring forms a brace between the other face of the bulkhead (10) and the groove.
Abstract:
A method for setting the cut-off point of a braking pressure control unit in a motor vehicle brake unit which is actuated by a pressure medium, wherein said braking pressure control unit includes a body (10) containing at least one valve controlled by a control lever (12) of which one end is pivotably (13) mounted on the body (10) while the other end is connected to one end of an adjustable resilient device (18). The method comprises the steps of prestressing the resilient device (18) to a predetermined degree, increasing the pressure medium pressure until it reaches a value which corresponds to the desired cut-off point, and determining the position of the control lever (12) for the pressure reached in the previous step, relative to the control unit body (10).
Abstract:
A device comprising, in a (per se) known manner, a valve (7) co-operating with two valve seats (10b, 16a) for controlling servo operation. The second seat (16a) is provided on a sliding sleeve (16) to accelerate air intake and cut the servo response time.
Abstract:
A pressure control device for a hydraulic circuit comprises at least one pressurized fluid generator (30), a brake motor (28) and a low-pressure fluid supply (32), and includes a computer-controlled solenoid valve which is connected to the pressurized fluid generator (30) and the brake motor (28) by respective ducts (29, 31), and comprises, in a housing (8), an electric coil (10) and a slidable magnetic core (12) controlling a slide valve (16). Said slide valve (16) slides in a bore provided in the body (18), defines two chambers (22, 40) on either side of the slide valve (16), and comprises a ball (50) valve (48) co-operating with a seat (52) on the housing (8), said slide valve (16) being provided with a channel (34) defined by two bearing surfaces (36, 38). One of the bearing surfaces (36) co-operates with the connecting duct (31) leading to the brake motor (28). The difference between the length (L) of said bearing surface and the diameter (D) of said duct is equal to a length (R) representing a functional overlap.
Abstract:
A device for vehicles having a braking system comprising a pneumatic brake servo (1) and a master-cylinder (2) enables the braked vehicle to be held on a slope. It comprises a slope-sensitive valve (12) preventing the servo (1) from returning to its rest position under certain conditions.
Abstract:
Pneumatic brake servo comprising a casing (10) containing a piston formed from a rear tubular part (22) supporting a skirt (14), and which, with the aid of a rolling diaphragm (12), defines a front chamber (16) permanently connected to a vacuum source and a rear chamber (18) selectively connected to the front chamber (16) or the atmosphere by a valve (40) operated by a control rod (34) capable of bearing, by means of the front side of a plunger (32), on a first side of a reaction disk (58) integral on its second side with a thrust rod (5). According to the invention, the piston (20) bears on the reaction disk (58) through an annular, elastic front side (68, 68').
Abstract:
The compensator is comprised, knowingly, of a body (1) where are defined two pressure chambers (2, 3), a piston (4) carrying a valve (6) susceptible of making the chambers communicate between each other, bearing means (8, 81) and reaction means. The latter are comprised of a second piston (5) sliding inside the first piston, a deformable member (8) and locking means (10, 11), so that the evolution law of the output pressure (P1) as a function of the input pressure (P0) presents more than two slopes.
Abstract:
A pneumatic brake servo comprising a housing (10) containing a piston which consists of a hub (20) and a skirt (14), and defining, by means of a roll-up membrane (12), a forward chamber (16) which constantly communicates with a vacuum source, and a rear chamber (18) which is selectively communicable with the forward chamber (16) when a first valve passage (56, 58) is open, or with the atmosphere when a second valve passage (76, 78) is open, said valve passages (56, 58; 76, 78) being defined by first valve members (58, 78) cooperating with second valve members (56, 76), and actuated by a control rod (35) which is engageable, via a plunger (32), with one side of a reaction disc (42) that is rigidly fixed to a push rod (44). Said first valve members (58, 78) are provided on the piston hub (20).
Abstract:
Means for transmitting force from a control rod (8) to a hydraulic piston (14) via a reaction disk (11) and a pushrod (13) in a pneumatically assisted braking system. The pushrod engages a cup (12) through a thrust washer (15) said cup housing the reaction disk (11), and is guided by a sleeve (16) fitted in the hydraulic piston (14).