Abstract: A hydraulic lash adjusting tappet (10) for use in engine valve gear of the direct-acting type have one end of the tappet contacting the end (26) of the combustion chamber valve stem (22) and the other end contacting the camshaft lobe (16). The tappet has a body (34) formed with a tubular wall portion (36) having one end thereof closed by an end wall (38) and with a tubular hub (40) therewithin formed integrally with the end wall and extending axially therefrom. A lash adjuster assembly (44) is slidingly received in the tubular hub which defines a reaction surface (50) remote from the cam face reaction surface (18) defined by the end wall.

Abstract: A hydraulic lash adjusting tappet (10) for use in engine valve gear of the direct-acting type having one end of the tappet contacting the end (26) of the combustion chamber valve stem (22) and the other end contacting the camshaft lobe (16). The tappet has a body (34) formed with a tubular wall portion (36) having one end thereof closed by an end wall (38) and with a tubular hub (40) therewithin formed integrally with the end wall and extending axially therefrom. A lash adjuster assembly (44) is slidingly received in the tubular hub which defines a reaction surface (50) remote from the cam face reaction surface (18) defined by the end wall.

Abstract: A hydraulic lash adjuster for valve gear of an internal combustion engine, having a plunger member reservoir chamber with a fluid passageway into the chamber that is substantially lower than the actual vertical height of the chamber and with a reservoir extender means for extending the oil reservoir chamber to a height well above the height of the fluid passageway and a means to precisely meter the flow of oil from the plunger member chamber through a bleed orifice passing through the upper end of the adjuster plunger member with the metering means retained and supported by a reservoir extender means.

Abstract: A hydraulic lash adjusting tappet for an internal combustion engine of the type supplying oil to a passage communicating with the tappet-receiving guide bore in the engine. The tappet has a roller follower on the cam end and a registration means adjacent the opposite end for orienting the roller with respect to the engine cam. The tappet body has at least one localized collector recess disposed longitudinally coincident and peripherally spaced with the registration means. In one embodiment the registration comprises a pair of oppositely disposed flats and the tappet has a pair of diametrically opposed collector recesses interconnected by a peripheral groove spaced longitudinally therefrom to by-pass the flats and provide sufficient surface for leakage control. An oil inlet hole is formed in one of the collector recesses for supplying the lash adjuster valve in the tappet. The localized recess is aligned with the engine supply passage by the orientation of the registration surface.

Abstract: A hydraulic lash adjusting tappet 10 for use in engine valve gear of the direct acting type having one end of the tappet contacting the end of the combustion chamber valve stem 26 and the other end contacting the cam-shaft lobe 16. The tappet has the body 40 formed with a tubular wall portion 42 having an inwardly extending web portion 44 intermediate the ends thereof with a tubular hub 46 disposed therewithin formed integrally with the web and extending axially therefrom. A cam face disc member 18 is attached about the periphery thereof to one end of the tubular wall. A plunger means 50 is slidably received in the tubular hub and includes a piston 64 slidable therein forming a high pressure chamber 86 within the plunger remote from the cam face and having therein one-way valve means for admitting fluid to the chamber for lash adjustment. An annular retainer 56 is received over the outward end of the hub and a passage 84 is provided through the tubular wall portion for communicating fluid to the reservoir.

Abstract: A hydraulic lash adjusting tappet 10 for use in engine valve gear of the direct acting type having one end of the tappet contacting the end of the combustion chamber valve stem 26 and the other end contacting the camshaft lobe 16. The tappet has the body 40 formed with a tubular wall portion 42 having an inwardly extending web portion 44 intermediate the ends thereof with a tubular hub 46 disposed therewithin formed integrally with the web and extending axially therefrom. A cam face disc member 18 is attached about the periphery thereof to one end of the tubular wall. A plunger means 50 is slidably received in the tubular hub and includes a piston 64 slidable therein forming a high pressure chamber 86 within the plunger remote from the cam face and having therein one-way valve means for admitting fluid to the chamber for lash adjustment. An annular retainer 56 is received over the outward end of the hub and a passage 84 is provided through the tubular wall portion for communicating fluid to the reservoir.

Abstract: A lash adjuster 10 is disclosed for use in engine valve gear. The adjuster includes a body 40 and a plunger 50 is slidably received in a bore 48 formed in body. A piston 63 is slidably received in the plunger and forms a high pressure chamber 86 within the plunger. A one-way valve means 72 is disposed intermediate the piston and plunger for admitting fluid to the chamber for lash adjustment. An annular retaining clip 90 is seated in a locking position in a groove 106 formed in an outer wall 104 of the plunger body. The clip extends radially beyond the end face of the hub bore 48 thereby preventing fall out of the plunger body prior to assembly in the engine valve gear.

Abstract: A bucket tappet is provided for direct-acting valve gear having a body portion formed of a light weight material having a thermal expansion suitable for use in an aluminum engine head. The body of the tappet is formed with a tubular wall, an inner tubular hub and a transverse web joining and supporting the hub within the outer tubular wall. An hydraulic lash adjusting piston/plunger assembly formed of steel is received within the tubular hub. The leakdown control surfaces within the lash adjuster are formed on the mating interfaces between the steel piston and plunger. The body of the tappet has a cam face member formed of hardened material, preferably iron base, received thereover transversely of the outer tubular portion and retained thereon for providing a cam contacting surface. The inner tubular hub has the end adjacent the cam face closed by portions of the body for forming a portion of the hydraulic reservoir in conjunction with a cavity formed in the hydraulic piston.

Abstract: A hydraulic brake booster is disclosed which is normally actuated by a primary pressure source, but which may be actuated by a secondary pressure source during failure of the primary pressure source. The booster includes a spool valve which controls communication between the primary pressure source and the booster pressure chamber. The spool valve is actuated by a control pressure which is generated by the vehicle operator when a brake application is effected. The control pressure shifts the spool valve to cause the latter to communicate fluid pressure from the primary pressure source into the pressure chamber. A pressure differential responsive piston is responsive to a pressure differential between the control pressure and the pressure communicated into the booster pressure chamber.

Abstract: A hydraulic brake booster is disclosed for use in a vehicle hydraulic braking system. The booster provides a spool valve having spaced lands and grooves cooperating with corresponding lands and grooves on the booster housing to control communication between an inlet port, an outlet port, an exhaust port, and the booster pressure chamber. The spool valve has an internal passage which communicates the booster pressure chamber to one of the aforementioned ports depending upon the position of the spool valve. A check valve is provided in a branch passage communicating with the groove communicated with the booster inlet port so that the pressure level in the pressure chamber never exceeds the pressure level at the inlet regardless of the position of the spool valve. This feature enhances spool stability.

Abstract: A bucket tappet is provided for direct-acting valve gear having a body portion formed of a light weight material having a thermal expansion suitable for use in an aluminum engine head. The body of the tappet is formed with a tubular wall, an inner tubular hub and a transverse web joining and supporting the hub within the outer tubular wall. An hydraulic lash adjusting piston/plunger assembly formed of steel is received within the tubular hub. The leakdown control surfaces within the lash adjuster are formed on the mating interfaces between the steel piston and plunger. The body of the tappet has a cam face member formed of hardened material, preferably iron base, received thereover transversely of the outer tubular portion and retained thereon for providing a cam contacting surface. The inner tubular hub has the end adjacent the cam face closed by portions of the body for forming a portion of the hydraulic reservoir in conjunction with a cavity formed in the hydraulic piston.