Abstract: A spacer for a valvetrain in an engine system includes a spacer body defining a spacer axis extending between a first axial spacer body end and a second axial spacer body end, and including an outer peripheral surface, a circumferentially extending inner peripheral surface forming a through-bore, an oil spray port extending from the inner peripheral surface to the outer peripheral surface, and a circumferentially extending fluid groove formed in the inner peripheral surface and extending to the oil spray port. Related valvetrain and rocker arm assembly apparatus is also disclosed.

Abstract: A valvetrain includes a rocker arm assembly having a rocker arm and an electromagnetic latch assembly. An electromagnet of the latch assembly is housed within a chamber formed by the rocker arm. Passageways suitable for oil cooling of the electromagnet are formed through and inside the rocker arm. In some embodiments, oil for cooling is supplied through a pivot. In some embodiments, oil for cooling is obtained from oil splash. Oil cooling may allow modes of operation such as of dynamic cylinder deactivation and dynamic variable valve actuation to be used without overheating the electromagnet.

Abstract: An engine system and valvetrain can comprise a rocker shaft combined with a first block, a first cylinder deactivation oil control valve in the first block, a second cylinder deactivation oil control valve in the first block. Also, a second block can be combined with the rocker shaft with a third cylinder deactivation oil control valve and an early exhaust valve opening oil control valve in the second block. The rocker shaft can comprise oil infeeds and oil outfeeds configured for supplying hydraulic pressure to the first and second blocks, the blocks can distribute the pressure to the control valves, and the blocks can return pressure to the rocker shaft. Intake and exhaust rocker arms can receive the returned pressure to actuate valves, and the rockers arms can be arranged line-to-line with no overlap during motion.

Abstract: A rocker assembly including a rocker shaft having an outer surface, main oil passage, a first radial passage and a second radial and a rocker arm having a first end and an inner cylindrical surface defining a bore, wherein the rocker shaft is received in the bore to pivotably mount the rocker arm onto the rocker shaft. The rocker arm includes a hydraulic lash adjuster mounted within the first end and a first oil passage having an inlet at the inner cylindrical surface and an outlet in fluid communication with the hydraulic lash adjuster. The inner cylindrical surface is spaced apart from the outer surface of the rocker shaft by a radial clearance, and wherein an inlet to the first oil passage and a first outlet of the first radial passage are in a loaded region of the radial clearance.

Abstract: A device configured for controlling lubrication of rocker arms of an engine with a CDA function, may include valves, wherein the opening/closing state of valves is varied in accordance with an operation state of a vehicle, to which the device is applied, and then, amounts of oil supplied to respective rocker arms are adjusted. Accordingly, the oil pressure and oil pumping capacity of a main gallery may be reduced and then, an enhancement in fuel economy may be achieved. Furthermore, lubrication performance may be secured through an increase in oil supply amount.

Abstract: An aspect of the invention provides an exhaust valve rocker arm assembly operable in a combustion engine mode and an engine braking mode, the exhaust valve rocker arm assembly comprising: a rocker shaft that defines a pressurized oil supply conduit; a rocker arm configured to receive the rocker shaft and configured to rotate around the rocker shaft, the rocker arm including an oil supply passage defined in the rocker arm; a valve bridge configured to engage a first exhaust valve at a spherical elephant foot and a second exhaust valve at a cylindrical elephant foot; a hydraulic lash adjuster assembly, disposed on the rocker arm, including a first plunger body configured to extend rigidly and cooperatively engage with the valve bridge.

Abstract: A hydraulic lash adjuster assembly constructed in accordance to one example of the present disclosure includes a bucket and a hydraulic lash adjuster. The hydraulic lash adjuster is received in the bucket and has a body, a leakdown plunger and a socket. The leakdown plunger is received in the body. The socket is received by the leakdown plunger. The socket and leakdown plunger define a reservoir therebetween. The socket includes a gravity feed arrangement to feed fluid to the reservoir of the leakdown plunger.

Abstract: A vehicle roller finger follower may include a main body including a supporting portion and a wall portion having one end portion integrally extending in a width direction of the supporting portion at both sides; and a pallet portion formed toward an outside in the width direction of the main body at the other end portion of the wall portion, wherein the wall portion has a mounting hole to mount a bearing, and a connection portion is formed at a lower portion of the wall portion at a position corresponding to the mounting hole.

Abstract: An exhaust valve rocker arm assembly operable in a combustion engine mode and an engine braking mode can include a rocker shaft and a rocker arm. The rocker shaft can define a pressurized oil supply conduit. The rocker arm can receive the rocker shaft and is configured to rotate around the rocker shaft. The rocker arm can have an oil supply passage defined therein. A valve bridge can engage a first exhaust valve and a second exhaust valve. In the engine braking mode, pressurized oil is communicated through the pressurized oil supply conduit, through the rocker arm oil supply passage and against an actuator such that a first plunger acts on the valve bridge during rotation of the rocker arm to a first angle opening the first valve a predetermined distance while the second valve remains closed.

Abstract: A switching roller finger follower, including: a body including a locking barrel arranged to receive pressurized fluid; a first chamber partially enclosed by the body; at least one arm rotatably connected to the body; and a locking mechanism. The locking mechanism includes: a locking pin at least partially disposed in the first chamber; and a shuttle assembly including a shuttle pin and a check valve. The shuttle pin: is at least partially disposed in the locking barrel; includes a through-bore in communication with the first chamber; and is displaceable, in response to the pressurized fluid, to engage and disengage the locking pin with the at least one arm. The check valve is arranged to enable flow of the pressurized fluid through the through-bore to the first chamber.

Abstract: Valvetrain of an internal combustion engine, including a rocker support, a fulcrum, and a rocker. The rocker support is mounted to a cylinder head and fixed relative thereto. The rocker is positioned about the rocker support and partially in an axial aligning groove of the rocker support. The fulcrum is sandwiched between the rocker support and the rocker. The rocker oscillates about the fulcrum as forces are received and applied to a first and a second end of the rocker.

Abstract: A lubrication structure for a rocker arm includes a lash adjuster mounted in an accommodating portion located in an end of the rocker arm and a pushrod abutting against a lower end of the lash adjuster. The rocker arm is formed with an arm-inside oil supply passage for supplying lubrication oil to the lash adjuster. The lubrication oil guided into the accommodating portion is further guided through a through guide hole of the accommodating portion to an outer peripheral surface of the accommodating portion. The lubrication oil is further guided from an outer oil supply passage formed downwardly in the outer surface of the accommodating portion to the abutment between the lash adjuster and the pushrod.

Abstract: A lubrication structure for a rocker arm includes a lash adjuster mounted in an accommodating portion located in an end of the rocker arm and a pushrod abutting against a lower end of the lash adjuster. The rocker arm is formed with an arm-inside oil supply passage for supplying lubrication oil to the lash adjuster. The lubrication oil guided into the accommodating portion is further guided through a through guide hole of the accommodating portion to an outer peripheral surface of the accommodating portion. The lubrication oil is further guided from an outer oil supply passage formed downwardly in the outer surface of the accommodating portion to the abutment between the lash adjuster and the pushrod.

Abstract: A rocker arm for a tappet pushrod valve train, which has a contact surface for a gas exchange valve on an underside at one end and a first bore in which a hydraulic lash adjusting element is arranged at another end. A second bore extends transverse through the rocker arm, between the ends. From the second bore, a passage leads to the first bore. A venting passage extends from a bottom of the bore at the another end and has an outlet aligned with the primary passage. A secondary passage branches from the venting passage and has an opening that extends to an upper side of the rocker arm and is situated in a longitudinal channel. The channel extends along the upper side and into a region on the one end. From the region, the hydraulic medium can be routed through an end passage to the contact surface.

Abstract: A lash adjuster includes a plunger inserted into a body and defining a pressure chamber in the body, and a spacer. The plunger is moved axially when a working fluid flows into or out of the pressure chamber so that a volume of the pressure chamber is increased or reduced. The plunger has a bottom wall defining the pressure chamber, a peripheral wall rising from an outer periphery of the bottom wall and an outer peripheral surface having an annular groove located at a height position confined in a thickness range of the bottom wall. When fitted in the groove, the spacer has a plate width equal to a separating distance between a groove bottom and an inner peripheral face of the body to fill a gap between the body and the plunger. The spacer has a flow path through which the working fluid introduced into the pressure chamber leaks.

Abstract: A rocker box, pushrod assembly, oil delivery system, tappets and tappet guides are provided for an engine, particularly a shovelhead motorcycle engine. The rocker box includes a separable upper portion and lower portion with a seal for sealing the upper portion and lower portion when coupled together. The pushrod assembly includes an adjusting unit that collapses into a pushrod shaft. The oil delivery system includes an oil passageway(s) in a rocker shaft of a rocker arm assembly, and at least one of an oil passageway(s) in a rocker box and an oil passageway(s) in a pushrod assembly.

Abstract: A connection device for connecting rocker, valve or injection assemblies in internal combustion engines, comprises a button defining a recess for housing herein an insert coupled to a rocker assembly or the like, the recess including a lubricating hole and the button comprising a button face contacting a driving plate and including a slot extending radially between the lubricating hole and the outer periphery of the button.

Abstract: A rocker shaft arrangement for a valvetrain system of an engine is provided. The rocker shaft arrangement includes a split rocker shaft having two fluidly separate internal regions. Each of the fluidly separate internal regions is arranged to selectively carry an independent supply of pressurized oil for distribution to valvetrain components. The two fluidly separate regions of the split rocker shaft are each further arranged to supply pressurized oil independent of each other to one of a high lift rocker arm and a low lift rocker arm of a rocker arm assembly for an engine valvetrain system.

Abstract: An accumulator fuel system for an internal combustion engine having a plurality of engine cylinders, includes an accumulator fuel volume (12; 112) for supplying high pressure fuel to one or more of a plurality of injectors (10) of the fuel system, each of which is arranged to supply fuel to an associated one of the engine cylinders. The accumulator fuel volume (12; 112) is integrated within an engine component, where the engine component provides a purpose other than that solely of an accumulator volume for storing high pressure fuel. For example, the accumulator volume (12; 112) is defined in one embodiment within a rocker shaft (32) of the engine and in another embodiment within the engine cylinder head (16).

Abstract: The present invention provides an improved rocker arm system for actuating poppet valves in high performance internal combustion engines. The rocker arm provides trunnion journals extending from each side fitted to outboard bearing mounts to guide the motion of the rocker arm. An I-beam rocker arm having high stiffness and low mass is disclosed.

Abstract: Valve train with hydraulic lash adjustment in the entire timing train, in which oil is delivered from the oil supply space of the hydraulic valve-lash adjuster (HLA) to the valve rocker arm via a hollow push rod, a choke limiting the oil discharge, the choke being designed in such a way that it seals off the push rod bore at the top when the oil pressure drops, that is to say when the engine is shut off, so that the oil is retained in the push rod bore (12) until—after the engine is started—the choke body (15, 22) opens up the discharge opening again.

Abstract: A rocker arm shaft retainer includes an elongated contoured sheet-like body having two opposite ends, two opposite sides longer in length than the ends, and a central portion between the sides. A plurality of fingers extend from the central portion towards the sides and each finger has a contoured recess for engaging a rocker shaft. The fingers define slots for receiving rocker arms. The retainer further includes a plurality of thrust faces along edges of the fingers for axial positioning of rocker arms on a rocker shaft. A plurality of bosses are also disposed on the fingers, each of the bosses having a generally flat surface.

Abstract: A plurality of oil passages are formed in a shaft body of a rocker shaft, which partially constitutes a valve drive system of an internal combustion engine. A bolt hole is formed in the shaft body in such a manner as to substantially perpendicularly intersect the axis of the shaft body. A bush is fitted into the bolt hole in such a manner as to prevent the bolt hole from establishing communication between the plurality of oil passages. A bolt is fastened through the bush to thereby fix the rocker shaft on a cylinder head. This structure improves the support rigidity of the rocker shaft and the dynamic characteristics of the valve drive system, and reduces the number of components and the number of working man-hours.

Abstract: In a valve operating apparatus, torque is transmitted from an eccentric drive cam attached to a drive shaft through a multinodular-link motion-transmission mechanism including a link arm, a rocker arm, and a link rod to a rockable cam to cause an engine valve to open and close. Also provided is a control cam whose geometric center is displaced from a control shaft. By way of eccentric rotary motion of the control cam, a valve lift of the engine valve is variably controlled. Lubricating oil supplied from an oil passage formed in the drive shaft via a first communicating passage formed in the drive cam into a clearance between the link arm and the drive cam, is forcibly fed via a second communicating passage into a pivotally linked portion between the link arm and the rocker arm by oscillatory pumping action created by eccentric rotary motion of the drive cam.

Abstract: To provide a flow path structure of a hollow tube capable of reducing facility cost and product cost by promoting assembling operability, a rocker shaft is constituted by including a tubular member having a hollow portion and a partitioning member interposed at the hollow portion of the tubular member for partitioning the hollow portion into a plurality of flow paths along an axial direction and the partitioning member is constituted by a plate member including a partitioning portion for partitioning the hollow portion into the flow paths along the axial direction and a close contact portion brought into close contact with an inner face of the tubular member.

Abstract: An engine valve train has oil flow to valve actuating components cut off or restricted when the valves are closed, to reduce parasitic losses. In an exemplary embodiment, a pushrod has a pivotable connection with a valve actuating rocker arm through which internal oil passages conduct oil for lubricating the rocker arm. The passages are aligned during valve actuation but become misaligned when the valve is closed. Misalignment of the passages at the sliding connection reduces the amount of oil flow through the connection to improve engine efficiency. When applied to cylinder deactivation engines, oil flow to rocker arms of deactivated valves is completely cut off, or reduced, further reducing parasitic losses.

Abstract: The present invention is directed to an improved assembly for operating at least one exhaust valve and at least one intake valve in a cylinder in an engine. The assembly includes a rocker shaft, an intake rocker arm pivotally mounted on the rocker shaft for operating at least one intake valve of the engine cylinder, an exhaust rocker arm pivotally mounted on the rocker shaft for operating at least one exhaust valve of the engine cylinder. The improved assembly includes a lash adjusting assembly for adjusting a lash between at least one of the intake rocker arm and the at least one intake valve, and the exhaust rocker arm and the at least one exhaust valve. The improvement further includes a fluid supply assembly for supplying fluid to the lash adjusting assembly to operate the lash adjusting assembly. The improved assembly further includes a control assembly for controlling the operation of the supply assembly in response to predetermined engine operating conditions.

Abstract: The present invention prevents abnormal wear of the friction surfaces surrounding the rocker arm, prevents poor lubrication when the engine is started at low temperature after a long period of shutdown, and improves reliability. A bag-shaped oil sump (24) opening upward is provided in the middle part of the rocker arm main body (17). A roller (15) and a roller pin (16) are provided inside the oil sump (24) and when the engine stops, these are immersed in the oil in the oil sump (24). When the engine stops, the area between the roller (15) and the roller pin (16) is lubricated. Further, when the engine is re-started after a long period of shutdown, until the oil has risen, the area between the roller (15) and the cam (8) can be lubricated using the oil adhering to the roller (15). When the rocker arm (6) oscillates downward, the oil in the oil sump (24) is supplied from the oil exhaust (28) by spraying towards the valve shaft end.

Abstract: An intake or exhaust valve for an internal combustion engine has a rocker arm with a pivot between its ends, one end of which is engaged by the pushrod, and the other end engages the valve stem. An adjustable stop has two positions for the rocker arm pivot; a rest position where there is no movement of the pivot, and an upper lock position where the pivot moves in response to the pushrod, and there is a reduction in the opening of the valve. A progressive rate spring compresses as the pivot moves towards the upper lock position, thereby modulating valve opening for relatively slow start (or stop) of valve stroke with accelerating (or decelerating stroke), as the progressive rate spring compresses (or expands). Relatively thinner and thicker Belleville springs are used in series to produce a progressive rate spring. The lock position of the pivot elevated above the rest position is determined by a hydraulic block trapping oil in a closed chamber.

Abstract: A valve train for an internal combustion engine includes a rocker shaft (9) provided with an oil passage, first and second rocker arms (7, 8) having support parts (7a, 8a) provided with bores (7b, 8b) to receive the rocker shaft (9) therein so as to be supported on the rocker shaft (9) for rocking motion, and a rocker arm interlocking mechanism (10) for selectively engaging or disengaging the first and the second rocker arms (7, 8). The first rocker arm (7) is provided with a pressure chamber (33) holding a piston (30) therein, a straight connecting passage 34 connected to the pressure chamber (33) and an oil passage (35)formed in the rocker shaft (9). An open end surface (7b1) of the bore (7b) of a first support wall (7e) of the rocker arm (7) is on an axially outer side of the pressure chamber (33).

Abstract: The rocker arm (2), obtained from a shaped element (30) made of metallic material, comprises surfaces (15,18) for engagement with a tappet (3) and with a stem (20) of a valve, respectively, and a portion (7) for mounting of a rotatable roller (8) able to co-operate with a cam-type actuating member (4). According to the invention, the surface (15) is formed in an insert (25) produced separately and fixed to the rocker arm. This constructional solution is particularly advantageous when the design constraints, determined by the position of the other elements of the valve train, require a substantial alignment between the center (A) of the surface (15) engaging the tappet, the center (B) of the roller and the contact (C) surface engaging the valve stem (20).

Abstract: An adjustment screw assembly (10) having an adjustment screw (11) engaged to a rocker arm (14) of a combustion engine (12) is disclosed. The adjustment screw (11) comprises a lower member (26) and a vertical member (28) wherein the vertical member (28) threads to the rocker arm (14) and the lower member (26) secures pivotally and rotatably to the vertical member (28) forming a pivotal connection (31). The pivotal connection (31) has a male connector (38) which snap fits through an engagement lip portion (46) of a female socket (35) and is thereby held together for combustion engine assembly purposes. Once the adjustment screw (11) is assembled and placed within the combustion engine (12), internal springs (24) of the engine (12) resiliently hold and secure the lower member (26) to the vertical member (28).

Abstract: In a valve operating system in an internal combustion engine, a swinging support section provided at a base end of a rocker arm is swingably carried on a rocker shaft mounted in a cylinder head. A plurality of valve abutments are provided at a tip end of the rocker arm and capable of being individually put into abutment against upper ends of a plurality of engine valves, and a cam abutment is provided on the rocker arm in an intermediate portion between the swinging support section and each of the valve abutments to come into contact with a valve operating cam. The swinging support section comprises a thinner cylindrical portion surrounding the rocker shaft, and thicker cylindrical portions which are formed at a thickness larger than that of the thinner cylindrical portion into a cylindrical shape to surround the rocker shaft and which are integrally and continuously provided at axially opposite ends of the thinner cylindrical portion, respectively.

Abstract: In a valve operating system in an internal combustion engine, a swinging support section provided at a base end of a rocker arm is swingably carried on a rocker shaft, and tappet screws are threadedly fitted in a plurality of boss portions formed at a tip end of the rocker arm and arranged in a direction parallel to an axis of the rocker shaft, so that they can be individually put into abutment against upper ends of a plurality of engine valves. Cam abutments are provided on the rocker arm in an intermediate portion between the swinging support section and the boss portions to come into contact with a valve operating cam. The boss portions are interconnected by a connection wall having a plurality of wall portions which intersect each other in a plane perpendicular to the axis of the rocker shaft. Thus, the rigidity of the tip end of the rocker arm is enhanced sufficiently.

Abstract: In an engine valve operation mechanism, opposite ends of a support shaft that supports a cam in a rotatable manner are supported in a first support hole of a first support wall formed in a cylinder head and a second support hole of a second support wall placed inwardly from the first support wall relative to the cylinder head, thereby allowing the support shaft to be inserted into the first support hole and the second support hole from outside the cylinder head, and an inner face of a head cover prevents the support shaft from becoming detached from the first support hole. The axial movement of the cam support shaft can thereby be restricted without employing a special stopper member, and the leakage of lubricating oil for the support shaft can be prevented without using a special sealing member.

Abstract: The present invention provides a valve operating system for internal combustion engines, having a roller rolling contacting a valve operating cam, the system being provided with an oil supply passage capable of reducing a pressure loss to a low level even when a flow rate of lubricating oil entering the oil supply passage increases in accordance with a heightened engine speed, improving the lubricating ability with respect to the roller, and attaining a long lifetime of a rocker arm.

Abstract: A sheet metal rocker arm manufactured by the steps of punching one metal plate to form a blank having a predetermined contour and through holes, and subjecting this blank to a bending work based on a press work to form a pair of side walls parallel to each other and a connecting portion for connecting the both ends of the side walls in the width direction thereof. This rocker arm is also provided with at least a pair of though holes formed at positions which are aligned with each other on the both side walls and at least one engagement portion provided in a part of the connecting portion. The thickness of at least one engagement portion, is formed to be greater than the thickness of the both side walls.

Abstract: A hydraulic lash adjuster (11) disposed within a bore (14) defined by an internal combustion engine (16), the hydraulic lash adjuster (11) comprising a ball plunger (12) including a body portion (13), whereby the body portion (13) is reciprocable in the bore (14) as said ball plunger (12) reciprocates between a relatively retracted position and a relatively extended position. The hydraulic lash adjuster (11) further comprising a leakdown plunger assembly (17) disposed within the body portion (13) and disposed downward in response to downward movement of the ball plunger (12) and said body portion (13). The leakdown plunger assembly (17) has a bottom portion (34) disposed toward a bottom (20) of the bore (14), to define a high pressure chamber (28). In the lash adjuster (11) of the invention, the ball plunger (12) and the body portion (13) comprise a single, integral, formed member.

Abstract: A rocker arm assembly for an internal combustion engine includes a central mounting shaft and a rocker arm rotatably mounted to the central shaft wherein the rocker arm has a generally planar main body with a valve contacting end and a push rod contacting end. A convex surface is formed on a lower edge of a valve contacting surface and the push rod contacting end includes a generally semi-spherical recess that creates generally semi-spherical outer projections on the sides of the rocker arm main body. The central mounting shaft according to one embodiment of the present invention is a generally hollow, tubular shaft having spaced apart lubrication apertures for providing lubricant to each rocker arm. A second embodiment of the present invention has a central mounting shaft that includes a plurality of relatively short, hardened shafts connected together at respective adjoining ends by a spacer sleeve to provide a rocker arm assembly having greater stiffness.

Abstract: A hydraulic lash adjuster (1) having a plunger assembly (3) including an upper plunger (4) and a lower plunger (5), the plungers being disposed within a body (2) defining a bore (2b,7), and in conventional leakdown plungers, cooperating with the bore to define a nominal diametral clearance. In accordance with one aspect of the invention, the plungers and the bore are provided with a reduced diametral clearance, substantially less than the nominal clearance, thus substantially improving the consistency of leakdown times. In accordance with another aspect of the invention, the upper plunger element (4) includes a center land (25) which defines a fluid passage (33), such as by having a flat (31) ground into the land, to insure the proper amount of lubrication fluid flowing out of the ball plunger (20).