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: A cam drive is provided for a valve control of a mixture-lubricated internal combustion engine that has a cylinder, and a cylinder head in which is disposed a poppet valve which is actuated by a pivotable rocker arm. Mounted in a cam chamber is a control cam that is driven by the crankshaft of the engine and on the cam path of which rests a drag lever that transfers the cam lift to the rocker arm. To achieve a reliable mixture lubrication, a flow guidance element is disposed in the annular chamber between the peripheral wall of the cam chamber and the maximum diameter of the path of a cam nose. The flow guidance element is provided with a flow edge that is disposed adjacent to the drag lever in the vicinity of the path diameter of the cam nose.

Abstract: An automotive engine arrangement 7 is provided having a VCT unit 96 wherein a lubrication oil restrictor 152 is incorporated with the VCT unit oil filter 127. The arrangement 7 of the present invention allows for VCT unit oil filter 127 to be installed in a cylinder head 18 of an automotive engine block 10 wherein placement of the VCT unit oil filter 127 in the appropriate location automatically installs the restrictor.

Abstract: A hydraulic manifold assembly for variable actuation of engine valves in accordance with the invention includes oil flow galleries. Engine oil under pressure communicates with a global supply gallery in the manifold assembly, from which pressurized oil is supplied selectively via individual supply galleries to each variable actuator for each valve through the action of solenoid valves. At engine startup, all galleries may be empty of oil, or partially filled. A global relief valve at the end of the global supply gallery causes air to be purged immediately upon startup of the engine. Each solenoid and individual gallery is provided with a low pressure relief valve leading back to the crankcase when the solenoid supply valve is closed. A bleed orifice between the global supply gallery and each individual gallery continually bleeds oil under low pressure into the individual gallery, which purges initial air therein.

Abstract: The present invention is a method and apparatus to clean an oil control valve for use by an internal combustion engine. The invention causes the oil control valve to execute a cleaning routine when specific entrance criteria are met. This ensures cleaning of the valve to remove contaminants that are wedged, pinched or otherwise trapped on the valve, without interference in the operation of the engine.

Abstract: A valve system has a piston mounted in a cylinder in one of first and second rocker arms and is adapted to be forced by a return spring, and an engagement projection formed in the other one of the first and second rocker arms and is adapted to abut the piston to cause both of the first and second rocker arms to move in conjunction with each other. The return spring is disposed eccentrically with respect to the piston in such a direction as to get away from the engagement projection. Therefore, it is possible to ensure a sufficient stiffness of a power transmitting section of the valve system and a sufficient valve lift.

Abstract: A hollow camshaft (19) lubrication system for aircraft engines that supplies lubricant (14) to cam lobe surfaces (25) from the interior surface (22) of the hollow camshaft (19) even during periods when aircraft operation moves the rotation axis of the hollow camshaft (19) from horizontal.

Abstract: Sprockets are fixed to ends of camshafts supported in a cylinder head via camshaft holders, and a timing chain is wrapped around these sprockets. An oil drain hole is provided for supplying relief oil of a hydraulic control valve to the timing chain, and an oil jet is provided for issuing a jet of oil at high pressure from the hydraulic control valve to the timing chain. When the engine is rotating at low speed oil is supplied only through the oil drain hole, and when the engine is rotating at high speed, oil is supplied through both the oil jet and the oil drain hole. The timing chain wrapped around the sprockets of the camshafts can thereby be reliably lubricated according to the operational state of the engine.

Abstract: A hollow camshaft (19) lubrication system for aircraft engines that supplies lubricant (14) to cam lobe surfaces (25) from the interior surface (22) of the hollow camshaft (19) even during periods when aircraft operation moves the rotation axis of the hollow camshaft (19) from horizontal.

Abstract: An engine powered hand-held power tool and engine lubrication method is provided, the power tool being intended to be carried by an operator during use. The power tool has a frame, including a handle to be grasped by the operator, an implement affixed to the frame having a rotary input member, and a small four-cycle, lightweight, internal combustion engine attached to the frame for driving the implement. The four-cycle engine has a lightweight aluminum alloy engine block having a cylindrical bore and an enclosed oil reservoir formed therein. A crankshaft is rotatably mounted in the engine block for rotation about a crankshaft axis. A piston reciprocates within the bore and is connected to the crankshaft by a connecting rod. An oil splasher driven by the crankshaft intermittently engages the oil within the enclosed oil reservoir to splash-lubricate the engine.

Abstract: A pair of valve-timing controlling oil passages leading to a second valve-operating characteristic changing mechanism are defined in a lower camshaft holder, and a valve lift controlling oil passage leading to a first valve-operating characteristic changing mechanism is defined between the pair of valve-timing controlling oil passages in a mating surface of the lower camshaft holder with a cylinder head. In an area where the width of the valve lift controlling oil passage is reduced in order to avoid the interference with the valve-timing controlling oil passages, the depth of the valve lift controlling oil passage is larger than that in the other positions, whereby a sectional area of the oil passage is secured. Thus, the oil passages leading to the first and second mechanisms can be formed compact in a camshaft support member.

Abstract: An internal combustion engine is provided with at least two cylinder banks whose cylinder heads are sealed by cylinder head covers. To ventilate the crankcase from the blow-by gases, ventilation lines are connected to the cylinder head covers and communicate with a negative pressure source, e.g., an intake pipe. The inside of the cylinder head cover is provided with structure for pre-separating the oil from the blow-by gases. An oil separation chamber is equipped with an inlet and an outlet opening, each as a part of the crankcase ventilation in the cylinder head covers. The oil separation chambers communicate with the respective camshaft space through their inlet openings. This arrangement ensures reliable crankcase ventilation in which a portion of the oil carried along by the blow-by gases can already be separated in the cylinder head cover and returned to the camshaft spaces.

Abstract: The object of the present invention is to facilitate an appropriate oil supply to the tensioner without a complex apparatus. A valve chamber 3A is formed in a cylinder head 3 which is connected to a cylinder block 2. An opening 23—for discharging the oil in the valve chamber 3A into a chain case 6 which is placed on the side of the cylinder block 2—is formed on a chain case mounting surface 20. Inside the chain case 6 on the chain case mounting surface 20 of the cylinder block 2 are placed a timing chain 15 and a tensioner 30 for applying tension to the timing chain 15. An oil dropping rib 24 for guiding the oil discharged through the opening 23 to the tensioner 30 is provided on the chain case mounting surface 20.

Abstract: A variable valve-timing engine includes a VTC for adjusting a relative phase angle of an exhaust cam for opening and closing an exhaust valve and an intake cam for opening and closing an intake valve; an oil pressure controlling unit for operating the VTC; a deterioration detecting unit for detecting the deterioration of hydraulic fluid in the oil pressure controlling unit; a correcting unit for correcting the oil pressure of hydraulic fluid of the oil pressure controlling unit based on a detected value by the deterioration detection unit, and a deterioration indicating unit for indicating a replacement of the hydraulic fluid based on the detected value of the deterioration detecting unit, so that the user can be advised of a required oil replacement.

Abstract: With regard to an automatic transmission in which an oil passage is formed by interposing a separator plate between a torque converter case and a valve body, a housing of a bearing that supports a counter shaft is press-fitted in a recess of the torque converter case, the edge of the separator plate abuts the outer periphery of the housing, and a notch formed on the valve body superimposed on the separator plate is in contact with the end face of the housing, thereby preventing the bearing from falling out. When supporting the bearing in the recess of the torque converter case, the present invention enables the bearing having a large axial dimension to be supported without deepening the above-mentioned recess.

Abstract: An automotive engine arrangement 7 is provided having a VCT unit 96 wherein a lubrication oil restrictor 152 is incorporated with the VCT unit oil filter 127. The arrangement 7 of the present invention allows for VCT unit oil filter 127 to be installed in a cylinder head 18 of an automotive engine block 10 wherein placement of the VCT unit oil filter 127 in the appropriate location automatically installs the restrictor.

Abstract: An outboard motor, which is improved for higher output energy, lower fuel consumption, and also simplified in layout of oil paths and facilitating maintenance of hydraulic control valves, includes an engine with a crank shaft, an engine body mounted to a mount case, and a valve driving mechanism for opening and closing intake valves and exhaust valves. The valve driving mechanism includes a valve operating characteristics variable mechanism of an hydraulic type, which changes operating characteristics of the intake and/or exhaust valves in accordance with the revolution speed of the engine. A hydraulic oil path for supplying the valve operating characteristics variable mechanism with hydraulic oil branches from a lubricant oil path for supplying bearing portions of a crank shaft and the valve driving mechanism with lubricant oil.

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 cylinder head includes a carrier member 50 integrally formed with a vertical wall portion 53 for supporting a camshaft 15, 16, a tappet guide 54 for containing a tappet 24 and a tappet-lubricating oil receiving portion 51 slanted around the tappet guide 54. An operation-oil supply passage 203, 209, 210 extends in the longitudinal direction of the carrier member 50 inside the tappet guide 54.

Abstract: An over-head cam type V-type engine comprises a crank shaft provided to penetrate through a crank chamber, a cam shaft provided in a head portion of each of two cylinders provided above the crank chamber, an intermediate shaft provided to penetrate through the crank chamber, a chain chamber for accommodating a chain to transmit a rotation of the crank shaft to the intermediate shaft, a first chain tunnel for accommodating a chain to transmit a rotation of the intermediate shaft to the cam shaft of one of the first and second cylinders, a second chain tunnel for accommodating a chain to transmit the rotation of the intermediate shaft to the cam shaft of the other cylinder, forcible oil supply means for supplying a lubricating oil from an oil sump to the head portion of each of the first and second cylinders, a first lubricating oil feedback path formed to reach the oil sump from the head portion of one of the first and second cylinders through the first chain tunnel and the crank chamber, and a second lubricat

Abstract: An internal combustion engine having an electromagnetic valve driving mechanism adjusts an amount of magnetizing current to be applied to the electromagnetic valve driving mechanism in accordance with a temperature or viscosity of a lubricant used in the electromagnetic valve driving mechanism. Accordingly, intake and exhaust valves can be driven with an electromagnetic force corresponding to a viscosity of the lubricant. Therefore, changes in opening-and-closing operation speeds of the intake and exhaust valves resulting from a temperature or viscosity of the lubricant that is supplied to a sliding portion of the electromagnetic valve driving mechanism can be reduced.

Abstract: A hydraulic control system for controllably directing pressurized engine oil to deactivation valve lifters to activate or deactivate the associated engine intake and exhaust valves. Passages to the lifters are controllably opened or closed by a solenoid control valve responsive to signals from a computerized engine control system. Preferably, the hydraulic control system includes a top plate having a first pattern of channels and bores formed in its underside, and a bottom plate having a second such pattern formed in its upper surface. The top and bottom plates are joined to form a hydraulic distribution manifold mounted on the engine. In a presently preferred embodiment, a gasket plate having bores and patterns of resilient gasketing material is provided between the top and bottom plates to simplify fabrication of the top and bottom plates.

Abstract: A plurality of modular camshaft follower assemblies of substantially identical construction and configuration are positively connected to a camshaft supporting structure of an internal combustion engine and adjustable to position a plurality of camshaft following lever arms at a proper timing location relative to a camshaft. Conduits in sealed serial communication with shafts pivotally supporting the camshaft following lever arms of the modular camshaft following assemblies deliver fluid flow from an engine block of the internal combustion engine to the camshaft following lever arms. The plurality of modular camshaft follower assemblies are each mounted on the engine through access openings in a side wall of the engine block.

Abstract: An accessory drive for the valves of an internal combustion engine, especially an Otto engine, especially for a motor vehicle, with at least one camshaft, which is divided into two camshaft halves. A camshaft gear wheel is provided between the two halves of the camshaft. A hydraulic camshaft adjuster is installed between the two halves of the camshaft. This adjuster is designed as a thrust bearing for each of the two halves of the camshaft, and each camshaft half has a hydraulic fluid connection extending via the associated thrust bearing to the camshaft adjuster.

Abstract: This invention relates to a method of operating an internal combustion engine comprising a valve train, said method comprising: (A) operating said engine using a normally liquid or gaseous fuel; (B) lubricating components of said valve train using a solid film lubricant; and (C) lubricating said engine, including said components of said valve train, using a low-phosphorus or phosphorus-free lubricating oil composition, said low-phosphorus or phosphorus-free lubricating oil composition optionally containing an extreme-pressure additive comprised of metal and phosphorus, provided the amount of phosphorus contributed to said low-phosphorus or phosphorus-free lubricating oil composition by said extreme-pressure additive does not exceed about 0.08% by weight based on the weight of said low-phosphorus or phosphorus-free lubricating oil composition.

Abstract: In an engine valve assembly, a valve lifter comprises a cylindrical main body portion and a head wall portion by which an opening of the cylindrical main body portion is enclosed and with which a cam is brought in contact, a valve stem is contacted on an axial center of the valve lifter and is disposed obliquely with respect to a direction of gravity, an exit of a lubricating oil supply bore is opened to an inner space of the head wall portion and is revolved due to a revolution of the valve lifter caused by a friction developed on the basis of a revolution of the cam, and a spring retainer supports an end of a valve spring, the spring retainer being attached onto the valve stem.

Abstract: First and second valve-operating characteristic changing mechanisms for changing the valve lift and the valve timing of an intake valve respectively are provided on an intake side of an engine. A hydraulic pressure control valve for the first valve-operating characteristic changing mechanism is mounted on one side of a cylinder head, and an oil filter for the second valve-operating characteristic changing mechanism is mounted on the other side of the cylinder head. The hydraulic pressure control valve and the oil filter are mounted outside a chain cover covering a timing chain. Therefore, the control valve and the oil filter do not interfere with the timing chain, and the maintenance of the control valve and the oil filter is carried out without removal of the chain cover.

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: This invention relates to a method of operating an internal combustion engine comprising a valve train, said method comprising: (A) operating said engine using a normally liquid or gaseous fuel; (B) lubricating components of said valve train using a solid film lubricant; and (C) lubricating said engine, including said components of said valve train, using a low-phosphorus or phosphorus-free lubricating oil composition, said low-phosphorus or phosphorus-free lubricating oil composition optionally containing an extreme-pressure additive comprised of metal and phosphorus, provided the amount of phosphorus contributed to said low-phosphorus or phosphorus-free lubricating oil composition by said extreme-pressure additive does not exceed about 0.08% by weight based on the weight of said low-phosphorus or phosphorus-free lubricating oil composition.

Abstract: An outboard motor (1), which is improved for higher output energy, lower fuel consumption, and also simplified in layout of oil paths and facilitating maintenance of hydraulic control valves, includes an engine (2) that comprises a crank shaft (24), engine body (3) mounted to a mount case (4), and valve driving mechanism (M1) for opening and closing a pair of intake valves (33) and a pair of exhaust valves 34. The valve driving mechanism (M1) includes a valve operating characteristics variable mechanism (M2) of a hydraulic type, which changes operating characteristics of the intake valves 33 in accordance with the revolution speed of the engine. A hydraulic oil path for supplying the valve operating characteristics variable mechanism (M2) with hydraulic oil branches from a lubricant oil path for supplying bearing portions of a crank shaft (24) and the valve driving mechanism (M1) with lubricant oil.

Abstract: In a valve-operating mechanism in a 4-cycle engine, a timing transmitting device is disposed on one side of an engine body. A cam device includes a cam coupled to a driven pulley of the timing transmitting device on one side of a cylinder head, intake and exhaust rocker shafts rotatably carried in the cylinder head, intake and exhaust cam followers secured to one ends of the rocker shafts with their tip ends in sliding contact with the cam, and intake and exhaust rocker arms secured to the other ends of the intake and exhaust rocker shafts with their tip ends abutting against the intake and exhaust valves. Thus, the cam of the cam device can be disposed on one side of the cylinder head to effectively reduce the entire height of the engine.

Abstract: A hollow camshaft (19) lubrication system for aircraft engines that supplies lubricant (14) to cam lobe surfaces (25) from the interior surface (22) of the hollow camshaft (19) even during periods when aircraft operation moves the rotation axis of the hollow camshaft (19) from horizontal.

Abstract: A valve timing control device incorporates a rotary member which rotates with one of a crankshaft of an internal combustion engine and a camshaft thereof, a rotational transmitting member which rotates with the other of the camshaft and the crankshaft; a vane provided on the rotary member; a pressure chamber formed between the rotary member and the rotational transmitting member, and divided into an advancing chamber and a delaying chamber by the vane; an oil retainer disposed between one axial end of the rotational transmitting member and one axial end of the rotary member; and a pressurized portion disposed between the other axial end of the rotational transmitting member and the other axial end of the rotary member.

Abstract: The four-stroke cycle internal combustion engine for portable working machines, which employs a toothed belt in the power transmission mechanism thereof, is disclosed. There is provided an OHC type four-stroke cycle internal combustion engine including a power transmission mechanism disposed vertically along a cylinder portion for transmitting the rotation of a crankshaft to a camshaft, wherein the power transmission mechanism comprises intermediate transmission members linked to the camshaft through a toothed belt and a rotation speed transmission member for reducing the rotation speed from the crankshaft and for transmitting it to the intermediate transmission members.

Abstract: To provide a multi-cylinder engine for a motorcycle, in which at least one of a plurality of engine valves provided in a cylinder head for each of combustion chambers corresponding to a plurality of cylinder bores arranged in the width direction of a body frame can be rested in a specific operational region by a hydraulic valve resting mechanism. A hydraulic control valve is provided for controlling the hydraulic pressure of working oil supplied to the valve resting mechanism and is mounted on the cylinder head. The length of the multi-cylinder engine along the width direction of the body frame is made as short as possible although the hydraulic control valve is mounted in the cylinder head. A hydraulic control valve is mounted on a side surface of a cylinder head to which a plurality of intake ports are opened along the longitudinal direction of a body frame.

Abstract: A modular vane cam phaser assembly for controllably and continuously varying the rotational phase between a camshaft and the crankshaft of a reciprocating internal combustion engine. The module includes a housing mountable to the front of an engine head, the housing supporting on an outer surface thereof a programmably-controllable spool valve for directing pressurized oil to an oil commutator extending into both the housing and a vane phaser wherein a rotor is bolted to the camshaft and a stator is bolted to a timing sprocket. The oil is distributed by the spool valve to opposite sides of the rotor vanes in response to signals generated by an induction cam rotation sensor and by other engine components and processed by a powertrain control module to advance or retard the opening of intake and/or exhaust valves in the engine. The housing is provided with internal passages for supplying oil from an engine port to the spool valve. Preferably, the oil is filtered by a thimble screen as it enters the housing.

Abstract: In an oil passage system of a valve moving control apparatus for an internal combustion engine having a hydraulic valve phase variable mechanism and a hydraulic valve characteristic changing mechanism, an oil pressure changing valve for changing operation of the valve characteristic changing mechanism is attached to a rear surface on exhaust side of a cylinder head, and a working oil supply passage is disposed at the exhaust side of the cylinder head. A phase operating oil passage leading to an oil pressure control valve for controlling operation of the valve phase variable mechanism is connected with the working oil supply passage at a downstream position of a branching portion where a change operating oil passage leading to the oil pressure changing valve branches from the working supply passage. In the phase operating oil passage formed in the cylinder head, flow of the phase operating oil is reversed by a cover which is provided at a front surface on suction side of the cylinder head.

Abstract: A rocker assembly includes a base member having opposite ends, a flange interconnected with each of the opposite ends, a pair of rocker arm support shafts supported by the flanges, and a rocker arm interconnected with each rocker arm support shaft for rotation with respect to the rocker arm support shaft about a longitudinal axis. The rocker assembly is housed in a rocker box housing, is removable from the rocker box housing, and is mounted directly on the cylinder head of a motorcycle. The rocker box housing includes a generally wedge-shaped cover and a generally wedge-shaped base to allow the cover to be removed from the base in a generally horizontal direction.

Abstract: Provided is a diamond-coated sliding part that is light, has excellent abrasion resistance, that prevents abrasion of the material of an opposite member, and that is effective in reducing power loss. This sliding part is especially useful as an adjusting shim for the valve train mechanism of an internal combustion engine such as an automobile engine in which the base material is silicon nitride or sialon and this base material surface is coated with a diamond coating layer. By performing finish processing on only a small part of peaks of diamond particles protruding from the surface of the diamond coating layer to reduce the height of the protrusions, or by controlling film forming conditions, etc., the profile bearing length ratio (tp) at a cutting level of 0.1 &mgr;m for the sliding surface of the diamond coating layer is made 60% or greater.

Abstract: In order to supply a sufficient quantity of lubricating oil to the entire valve operating mechanism, we designed a lubrication device for an overhead valve engine. A first breather passage goes from the valve operating mechanism chamber to the crankcase, passing through the cylinder head and cylinder. The first breather passage opens in the vicinity of the spring retainer for the intake valve on the surface of the cylinder head which faces the valve operating mechanism chamber for the valve operating mechanism. The opening of the first passage and the vicinity of the exhaust valve are connected by a second breather passage. This second passage comprises a groove formed by cutting in the valve operating mechanism chamber surface of the cylinder head, and a tunnel formed between an oil guide wall which goes up from the valve operating mechanism chamber surface of the cylinder head and the peripheral wall of the head. One end of this groove connects to the opening of the first breather passage.

Abstract: An apparatus for varying the phase of the camshaft in the combustion engine of a motor vehicle has an adjuster which is connected to the camshaft and is operable to adjust the phase of the camshaft prior and subsequent to starting of the engine. To this end, the adjuster is connected with a hydraulic drive system which can operate the adjuster while the engine is idle. Once the engine is started, the drive system receives pressurized fluid from the lubricating circuit of the engine. Prior to starting of the engine, the drive system receives pressurized fluid from a source other than the lubricating circuit or from a source which is provided in addition to the lubricating circuit. The other source is preferably the hydraulic circuit of the power steering system (such as a speed-sensitive power steering system) of the motor vehicle.

Abstract: The invention relates to a rocker arm (1) of a valve train of an internal combustion engine. This rocker arm (1) comprises two longitudinally extending side walls (2, 3) which enclose an intermediate space (16) while being connected to each other by a crossbeam (4) to form a U-shaped cross-section. According to the invention, a separate channel (24) for the transport of lubricant is created on a top surface (22) of the crossbeam (4). This channel (24) starts from an abutment (9) for an end of a push rod on the undersurface (8) of the crossbeam (4) and leads to a support (12) for an end of a gas exchange valve in the region of a second end (11) of the crossbeam (4).

Abstract: An engine powered hand-held power tool and engine lubrication method is provided, the power tool being intended to be carried by an operator during use. The power tool has a frame, including a handle to be grasped by the operator, an implement affixed to the frame having a rotary input member, and a small four-cycle, lightweight, internal combustion engine attached to the frame for driving the implement. The four-cycle engine has a lightweight aluminum alloy engine block having a cylindrical bore and an enclosed oil reservoir formed therein. A crankshaft is rotatably mounted in the engine block for rotation about a crankshaft axis. A piston reciprocates within the bore and is connected to the crankshaft by a connecting rod. An oil splasher driven by the crankshaft intermittently engages the oil within the enclosed oil reservoir to splash-lubricate the engine.

Abstract: A method of operating an actuator for electromagnetically controlling a valve in an internal combustion engine involves supplying a heating current to the operating coils of the actuator before starting the internal combustion engine from a cold start condition. Thereby, the operating coils, the components surrounding them, and the lubricant are heated to ensure proper viscosity of the lubricant and thus proper operation of the actuator.

Abstract: Roller follower assemblies generally reduce frictional losses and wear associated with operating fuel injectors using a cam. Oil helps to reduce wear, but may not remove small particles. Buildup of these small particles may prevent a roller of the roller follower assembly from rotating about an axle pin. In the present invention, a hard coating is disposed between the axle pin and the roller to reduce rolling friction and buildup of small particles.

Abstract: A seal for a servo medium of a torque transmission device (2) in which sealing rings can be dispensed with by providing an annular sealing gap (12) which extends on both axial sides of a servo medium supply and by a special choice of materials and structural configuration in this region, the sealing gap (12) diminishes in size with increasing warming-up of the device (2) which diminution counteracts the decreasing viscosity of the servo medium.

Abstract: In each engine valve assembly (2) of intake and exhaust valve for an internal combustion engine, the engine valve is opened and closed according to a cooperation of electromagnetic forces and spring forces of a pair of electromagnets (5, 6) and a pair of spring members (7, 8), an actuator housing (3) in which the pair of electromagnets and pair of spring members are housed taking an engine oil structure having at least one oil passage (21) through which an engine oil external to the valve assembly is supplied to the actuator housing and at least one oil outlet hole (22) through which the engine oil in the oil passage is caused to flow onto a slidable portion of movable members of the valve assembly of a valve axle portion of the engine valve and an armature (4) and taking an oil heating structure (23), the oil heating structure being enabled to heat the oil within the oil passage due to a heat transfer action thereof by means of a simultaneous power supply to the pair of first and second electromagnets before

Abstract: A hydraulic control valve mounting structure in an engine wherein a chain cover is attached to both a cylinder block and a cylinder head so as to cover a timing chain which transmits the rotation of a crank shaft to both intake and exhaust cam shafts. An oil pump is driven by the crank shaft, and a hydraulic control valve which supplies oil discharged from the oil pump to a hydraulic-actuated device in a hydraulic controller is attached to the chain cover. The hydraulic control valve mounting structure is such that the hydraulic control valve is attached to an outer surface of the chain cover while being positioned so that an upper portion thereof is covered at least partially with a mount installing boss portion of the chain cover.

Abstract: An oil-passage structure of an internal combustion engine which eliminates the necessity of drilling a hole through the chain cover or the tensioner bracket and allows the tensioner bracket to be moved to its proper position according to vehicle layout restrictions, and. maintains optimum functioning of the oil control valve by cooling the oil supplied thereto. The oil-passage structure includes an external oil pipe interconnecting the oil pump and the oil control valve and arranged between the auxiliaries machine driving belt and the chain cover.

Abstract: A device provided on a internal combustion piston engine for changing the rotational relations between at least one camshaft (5) and a crankshaft (6) includes a hydraulic cylinder (4). This hydraulic cylinder (4) is acted upon by a supply unit (7, 14) which displaces gas cushions in the hydraulic cylinder (4) when the internal combustion piston engine is at a standstill and replaces the gas cushions with hydraulic cylinder, especially motor oil.