Abstract: An internal combustion engine having an engine block with a chamber disposed therein containing a reciprocating piston. A head is mounted on the head of the engine block for providing fuel to the chamber. The chamber is designed to have a first end with a first diameter that tapers inward to a second end that has a second diameter that is less than the first diameter and extends into a cylindrical portion such that the reciprocating piston reciprocates within the cylindrical portion.

Abstract: A piston and cylinder assembly for an engine is disclosed. The assembly includes a piston including an aluminum alloy piston body having a crown and a skirt extending from the crown. The skirt has an exterior surface having a surface finish in a wave form with peaks and valleys, and having a roughness total between approximately 6 and 12 micrometers, the roughness total (Rt) being defined as the difference between the highest peak and lowest valley within an assessment length. The surface finish has an approximate peak-to-peak distance between 0.17 and 0.25 millimeters within the assessment length. The exterior surface is coated with a nickel ceramic composite coating. An aluminum alloy cylinder bore is disposed in an engine block and is configured to receive the piston body. The cylinder bore has a bore surface having a roughness average (Ra) between approximately 0.09 and 0.25 micrometers. The cylinder bore may be made of a eutectic Al—Si alloy including other alloying elements.

Abstract: A compression ignition internal combustion engine having at least one combustion chamber for high ignition pressures. Each combustion chamber comprises a cylinder bore in the crankcase or a cylinder liner in the cylinder bore, a piston, and a cylinder head. Spaces for conveying coolant are disposed in the crankcase such that coolant flows about walls of the cylinder bore or a liner. The cylinder head has coolant chambers. The internal combustion engine has a separate cooled plate disposed between the combustion chamber and the cylinder head. The cooled plate forms a surface cover of the combustion chamber and is connected in a positively engaging and gas tight manner with the crankcase and/or the cylinder liner. Valve seats for at least one inlet valve and at least one outlet valve are disposed in the cooled plate, and at least one injection valve extends through the cooled plate.

Abstract: A cylinder block 3 of an engine 1 is formed by assembling an inner block member 10 and an outer block member 15. The inner block member 10 includes an upper deck portion 7 integrated with a cylinder liner portion 8. The outer block member 15 includes a cylinder outer wall portion 12. The cylinder head 2 is fastened to an upper deck portion 7 with head bolts 31. The cylinder outer wall portion 12 is fastened to the upper deck portion 7 with block fastening bolts 32 at an opposite side of the upper deck portion 7 with respect to the cylinder head 2. The head bolts 31 and the block fastening bolts 32 are threaded with the upper deck portion 7 from the opposite sides with respect to each other. As a result, deformation of the upper deck portion 7 and inclination of the cylinder liner portion 8 due to fastening of the bolts 31, 32 are reliably prevented.

Abstract: The invention relates to a connection arrangement for assemblies of an internal combustion engine, more preferably for the clamping of a cylinder head to a crankcase by means of at least one tension rod, wherein a sealing device is associated with the or each tension rod in order to seal an external thread of the tension rod against a medium. In order to create a new kind of device with tension rod clamping, which omits a slot causing notch stress in the tension rod yet securely protects the thread of the tension rod against corrosive attack it is provided that the sealing device comprises a profiled elastomer sealing ring which is positively fixed within a thread undercut on the circumference of the tension rod shank and which is compressed in a defined manner through the screwing-in of the tension rod in the bore of the assembly and through the surface geometry of the circumference of the tension rod shank and the bore of the assembly.

Abstract: An internal combustion engine is provided that includes a combustion chamber; a secondary air passage located above the combustion chamber; an exhaust passage that communicates with the combustion chamber; and a water jacket that is located between the exhaust passage and the secondary air passage.

Abstract: An insert for a cylinder sleeve or a cylinder of an internal combustion engine is provided for narrowing the diameter of the cylinder sleeve or cylinder in the region of the upper dead center of a piston guided in the cylinder sleeve or cylinder. The insert is formed as an open, biased ring having a ring joint, which ring is held radially by means of its radial forces, which act outward, and axially by a recess in the cylinder sleeve or cylinder, in such a manner that the radial surface pressure is approximately the same on the circumference, whereby its ratio of ring wall thickness (d) to inside diameter (D) of the cylinder sleeve or the cylinder amounts to between 0.001 and 0.02.

Abstract: An electrohydraulic control module is provided for making available a compressed fluid, especially compressed oil for actuators, which are used for actuating control units, for example, for switching gas-exchange valves of an internal combustion engine on and off, with a control housing, which is attached to a connection part of the internal combustion engine and which has electrical switching valves that are connected to an oil supply line and to control oil lines leading to the actuators. The production and assembly expense of the electrohydraulic control modules is reduced in that an intermediate housing (6), which is injection molded from plastic and which has at least the oil supply line and the control oil lines (17), is clamped between the connection part (5) and the control housing (7).

Abstract: The disclosed multi-cylinder, poppet-valved engine, has replacement cylinder sleeves larger than the original sleeves, and laterally supported near their upper ends by an aluminum alloy plate having a continuous flange or boss projecting into the cylinder block. The flange has an inner perimeter surface having a profile fittingly engaging upper exterior cylindrical surfaces of the sleeves providing lateral support to the sleeves and heat transfer from the sleeves to coolant and to the block.

Abstract: A cylinder head for an internal combustion engine is provided for a motor vehicle. The cylinder head includes, but is not limited to a flow channel, which can be connected to a cylinder. An air duct for injecting gas into the flow channel is connected to the flow channel via a connection channel. The air duct is produced by means of casting and cylinder head provides for a good secondary air injection by means of a simple production.

Abstract: An internal combustion engine includes: a cylinder block having one or more cylinders, a cylinder liner in a tubular shape disposed inside the cylinder; a piston reciprocating inside the cylinder liner and having a top land portion formed of an outer periphery of the piston sandwiched between a piston head and an uppermost ring groove; and a liner installation ring forming, inside the cylinder, a circular step portion protruding toward the inner periphery of the cylinder liner. The liner installation ring is disposed in the cylinder block or the cylinder liner in such a manner that the bottom face of the liner installation ring face to the uppermost portion of the cylinder liner. The liner installation ring is disposed at a position in accordance with the upper end position of the top land portion when the piston reaches a top dead center. The liner installation ring is set to protrude from the inner periphery of the cylinder liner in an inward direction at a length of 0.05 mm or more to 0.5 mm less.

Abstract: A cylinder block 3 of an engine 1 is formed by assembling an inner block member 10 and an outer block member 15. The inner block member 10 includes an upper deck portion 7 integrated with a cylinder liner portion 8. The outer block member 15 includes a cylinder outer wall portion 12. The cylinder head 2 is fastened to an upper deck portion 7 with head bolts 31. The cylinder outer wall portion 12 is fastened to the upper deck portion 7 with block fastening bolts 32 at an opposite side of the upper deck portion 7 with respect to the cylinder head 2. The head bolts 31 and the block fastening bolts 32 are threaded with the upper deck portion 7 from the opposite sides with respect to each other. As a result, deformation of the upper deck portion 7 and inclination of the cylinder liner portion 8 due to fastening of the bolts 31, 32 are reliably prevented.

Abstract: A squish surface having the shape of a plane surface orthogonal to the axis of a piston is formed on the intake side of the piston top surface. A squish area is formed between the squish surface and a plane surface-shaped squish surface on the cylinder head side, and at the same time, a squish guide surface is formed in the piston top surface so as to be continuously ridged from the squish surface toward the vicinity of a spark plug.

Abstract: A cylinder head cooling structure and an oil temperature control system are provided for an internal combustion engine having a plurality of cylinders, each having a plurality of intake ports and a plurality of exhaust ports. The engine includes cooling oil jackets surrounding the spark plugs in the cylinder head, a thermostat attached to the front surface of the crankcase independently of an oil filter, and an oil temperature sensor disposed on a rear face of the cylinder block above the crankcase in an oil supply path formed on the cylinder rear face for supplying oil to the oil jackets. Oil passages conducting oil into the oil jacket are provided between two separate parts of a bifucated intake port and between two separate parts of a bifurcated exhaust port, and only cooling system oil reaching high temperatures is allowed to flow through the thermostat, thereby improving temperature control response.

Abstract: A cover for tightly sealing a device comprises at least one elastomer part which is designed to fit tightly against a contact surface of a device, and another part which follows the elastomer part, with the elastomer part being arc-shaped in a transition area to the other part.

Abstract: An outboard motor S has an exhaust manifold passage 37 for carrying exhaust gas from combustion chambers 30. The exhaust manifold passage 37 is formed in a part of a cylinder head 22 in an exhaust-side part of an internal combustion engine E on the side of the cylinder head 22 with respect to a joint surface P of a cylinder block 20 joined to the cylinder head 22. An exhaust passage 38 is formed in the cylinder block 20 and connected to the exhaust gas outlet 37e of the exhaust manifold passage 37 in the joint surface P. An electrical equipment box 50 holding electrical equipment is placed in the exhaust-side part so as to overlap the exhaust passage 38 when viewed in vertical direction. An electrical equipment box 50 is disposed adjacent to the cylinder head 22 with respect to the direction parallel to the axes of cylinders 20a.

Abstract: A gasket includes at least one gasket layer. The gasket layer has a push rod or cam timing chain opening formed therein. A clip is secured to the gasket layer and positioned within the push rod or timing chain opening. The clip selectively receives and positions an oil drain tube within the push rod or timing chain opening.

Abstract: There is provided a structure for connecting a piston to a crankshaft in an internal combustion engine, including a piston pin fitted into the piston, a crankpin integral with the crankshaft and a connecting rod having a piston pin bearing portion slidably engaged with an outer cylindrical portion of the piston pin and a crankpin bearing portion slidably engaged with an outer cylindrical portion of the crankpin. At least one of the piston pin bearing portion of the connecting rod and the outer cylindrical portion of the piston pin and at least one of the crankpin bearing portion of the connecting rod and the outer cylindrical portion of the crankpin have hard carbon coatings formed thereon with a hydrogen content of 20 atomic % or less.

Abstract: A portable 4-cycle engine with a configuration which allows cooling air to flow in the direction of the crankshaft relative to a cylinder head on a cylinder, and a portable machine equipped with this engine, are provided, respectively. In such an engine, the cylinder is separated from the cylinder head including a combustion chamber formed at the cylinder side therein. The engine further comprises a valve train area formed in the cylinder head at the downwind side of the cooling air, and a plurality of vertical fins protruding upward from the cylinder head and extending in the direction of the crankshaft. The valve train area and the plurality of vertical fins are all integrally formed with the cylinder head, so that the cylinder head can be made thinner and lighter with high rigidity to enable the portable machine to become smaller, lighter, and more powerful.

Abstract: Apparatus includes left and right inline type cylinder heads essentially identical to one another and each having an intake side, the left and right cylinder heads being combined into a “V” configuration, so that the two intake sides face one another. A left-head overhead camshaft structure is located in the left head and a right-head overhead camshaft structure is located in the right cylinder head, the overhead camshaft structures being of an end-drive type. A crankshaft is located proximate an apex of the V, the crankshaft having a front-facing end and a rear-facing end, and an offset gear mechanism operates in cooperation with the rear-facing end of the crankshaft for driving the left-head overhead camshaft structure.

Abstract: An engine fastening structure in which a cylinder body and a cylinder head are stacked on and fastened to a crankcase, characterized in that a case side flange portion 3b formed at a crankcase side end portion of the cylinder body 3 is fastened to the crankcase 2 with case bolts 30a, and at least part of head bolts 30c for fastening the cylinder head 4 and the cylinder body 3 together are screwed into the case side flange portion 3b.

Abstract: A lever electromechanical valve actuator assembly and arrangement of electromechanical valve actuators that creates a compact actuator assembly to increase ease of serviceability, provide space for engine components and eliminate interference between the actuators and components in the vehicle engine compartment.

Abstract: A cylinder head assembly for an internal combustion engine houses a camshaft position sensor for determining an angular position of a camshaft. A cylinder head upper is disposed between a cylinder head and a cylinder head cover, covering a part of a top opening of the cylinder head. The cylinder head is softly mounted, while the cylinder head upper is rigidly mounted on the cylinder head. The cylinder head upper includes a sensor boss for the camshaft position sensor, so that the camshaft position sensor is facing downward toward a signal plate attached to the camshaft.

Abstract: A roller rocker mounting mechanism for an internal combustion engine valve actuating mechanism includes a first rocker stand having a first locating boss and a second rocker stand having a second locating boss. An indexing link has a first portion separably attachable to the first locating boss and a second portion separably attachable to the second locating boss to connect the first rocker stand and the second rocker stand in a manner that prevents rotation of either rocker stand when the rocker stands are attached to the cylinder head.

Abstract: A Lifter Oil Manifold Assembly or LOMA has a metal deckplate with a non-metallic valve mount/stiffener having elastomeric seals on the surface contacting the deckplate. The electrically operated valves for controlling flow to individual valve lifters are mounted on bosses formed on the valve mount/stiffener. A bracket retains the valves on the valve mount/stiffener and the valve mount/stiffener on the deckplate when assembled on the engine by through bolts.

Abstract: A flat gasket for sealing off a region, especially for sealing off a region bordered by a cylinder head cap, includes an elastic material that effects the sealing function and at least one pass-through region for passing through a conductor such that the conductor can extend, in the mounted condition of the flat gasket, from outside the region to be sealed off into the interior of such region. The flat gasket also includes a shaped tongue connected to the pass through region and extending into the region to be sealed off, the shaped tongue having opposed flat sides and being deformable at least vertically relative to the plane of the seal, and the tongue supporting on its flat sides at least one conductor guiding- and/or conductor securing-element.

Abstract: There is provided an outboard motor (1), comprising: an intake valve (17) and an exhaust valve (18) provided to a cylinder head (14); a camshaft (20) arranged substantially vertically in the cylinder head to open and close the intake and exhaust valves; a valve operation characteristics changing device (29) hydraulically operated to change operation characteristics of at least one of the intake and exhaust valves; a selector valve (electromagnetic valve 27) for controlling an oil pressure provided to the valve operation characteristics changing device; and an exhaust passage component part (exhaust manifold 23) secured on a side of the cylinder head, wherein the selector valve is disposed at a position (space G) beside the cylinder head and overlapping with a top end surface of the exhaust passage component part.

Abstract: The reciprocating engine comprises a rocker valve gear, pistons which are fastened to a connecting rod and connected by crankshaft journals to a crankshaft, a balancer, and a camshaft which is driven by the crankshaft and in turn actuates rockers, the mentioned elements being arranged in a crankcase having a cylinder head and cylinder head cover. The cylinder head is provided with integrally cast or screwed-on receivers serving for the attachment of the hollow camshaft without requiring separately fastened bearing blocks. Correspondingly, the cylinder-head comprises further integrally cast or screwed-on receivers which serve for the attachment of the hollow rockers without requiring separately fastened bearing blocks.

Abstract: A cylinder block, a cylinder head and a cylinder head cover are stacked in order to form a four-cycle engine. A valve train of a single overhead camshaft (SOHC) type provided with an intake valve and an exhaust valve is provided in the cylinder head. A line extending parallel with a joint between the cylinder head and the cylinder head cover is inclined forward and downward toward a line parallel with a joint between the cylinder block and the cylinder head. An axis of an exhaust valve and/or an axis of a plug tube is/are perpendicular to the line extending parallel with the joint between the cylinder head and the cylinder head cover. A cylinder head hanger is integrally formed at an uppermost end of a rear portion of the cylinder head over an intake port.

Abstract: A line of small internal combustion engines, including twin cylinder engines and single cylinder engines. The engines each include a crankcase, and one or more cylinder members attached to the crankcase, the cylinder members being separate components from the crankcase. A number of different crankcases are provided for various types of single and two cylinder engines, the crankcases having common mounting structure to which the cylinder members may be attached. Thus, the manner in which the cylinder members are attached to the crankcases is the same for each of the different types of crankcases. Two different types of cylinder members are provided, one having a side valve or “L-head” valve train, and the other having an overhead cam (“OHV”) valve train. The cylinder members are therefore modular components which may be selectively used in a variety of different types of engines.

Abstract: In a fluid passage structure of an internal combustion engine wherein oil flows from an in-block flow passage formed in a cylinder block to an in-head flow passage formed in a cylinder head, a groove that is generally rectangular in cross section is so formed in a top face of the cylinder block as to extend from a position corresponding to an opening of the in-block flow passage formed in the top face to a position corresponding to an opening of the in-head flow passage formed in a bottom face of the cylinder head, by machining or the like. Thus, a flow passage arrangement in which the openings of the flow passages are offset from each other is allowed. As a result, the degree of freedom in designing the fluid passage structure is enhanced.

Abstract: There is provided a method for manufacturing a cylinder for an internal combustion engine by making use of an insert core, which makes it possible to manufacture the cylinder by a die casting method such as a high-pressure die casting method at low cost and in high accuracy.

Abstract: Internal combustion engine with a flat plate that is disposed, adjacent a combustion chamber, between a cylinder head and a cylinder, said plate having at least two ports for at least one intake valve and/or one exhaust valve and/or at least one injector device or the like, and being disposed adjacent a flat cylinder head bottom. At least one relief slot is formed in the plate at least between two ports.

Abstract: A novel combustion chamber configuration locates the stems of all four of its valves in a parallel with the axis of the engine cylinder closed by the chamber. In this variation which is especially well suited for a barrel-stratified mode of engine operation, the spark plug can readily be offset a moderate distance from the axis of the cylinder into the fueled side of the combustion chamber because the pair of intake valves is separated from the pair of exhaust valves by an extra amount. The associated overlapping of the intake valve faces outside of a projection of the cylinder bore is utilized to form two symmetric flow masks which in turn function as the primary means for generating strong barrel swirl during the intake stroke.

Abstract: A fuel injector-spark plug combination includes a fuel injector for the direct injection of fuel into a combustion chamber of an internal combustion engine, and a spark plug for igniting the fuel injected into the combustion chamber, and has a spark-plug insulator including a first electrode, and includes a second electrode. The fuel injector and the spark-plug insulator of the spark plug are each disposed in a recess of a cylinder head of the internal combustion engine. The fuel injector and the spark-plug insulator of the spark plug are fixedly held in place in a shared connecting member arranged outside of the cylinder head.

Abstract: An oil supply structure for an engine cylinder head is disclosed. In an engine having a variable valve timing apparatus utilizing oil pressure as an operational power source to smoothly supply lubricating oil for the cylinder head and an operational oil for the variable valve timing apparatus in a clean state, the arrangement of passages allows for ease of installation and maintenance of the components of the oil temperature sensor and oil control valve comprising the variable valve timing apparatus.

Abstract: The disclosed multi-cylinder, poppet-valved engine, has replacement cylinder sleeves larger than the original sleeves, and laterally supported near their upper ends by an aluminum alloy plate having a continuous flange or boss projecting into the cylinder block. The flange has an inner perimeter surface having a profile fittingly engaging upper exterior cylindrical surfaces of the sleeves providing lateral support to the sleeves and heat transfer from the sleeves to coolant and to the block.

Abstract: A coating is plasma sprayed onto a cylinder bore and cylinder head sealing surface of a cylinder block of an internal combustion engine. The coating is harder and/or more wear resistant than the cylinder block, itself. A cylinder head mounts to the cylinder head sealing surface so that the coating is at least partially disposed between the cylinder block and the cylinder head. The coating therefore protects the cylinder block from exposure to the cavitating pressures that can develop in the combustion chamber of the cylinder. A depression is formed in the cylinder head sealing surface to account for the thickness of the coating. A chamfer is formed in the transition between the cylinder bore and the cylinder head sealing surface.

Abstract: A cylinder block, a cylinder head and a cylinder head cover are stacked in order to form a four-cycle engine. A valve train of a single overhead camshaft (SOHC) type provided with an intake valve and an exhaust valve is provided in the cylinder head. A line extending parallel with a joint between the cylinder head and the cylinder head cover is inclined forward and downward toward a line parallel with a joint between the cylinder block and the cylinder head. An axis of an exhaust valve and/or an axis of a plug tube is/are perpendicular to the line extending parallel with the joint between the cylinder head and the cylinder head cover. A cylinder head hanger is integrally formed at an uppermost end of a rear portion of the cylinder head over an intake port.

Abstract: A cylinder head of an internal combustion engine is disclosed with an upwardly open spark plug tube (1), a connection thread (6) present on the end of the spark plug tube for screwing the spark plug into the cylinder head (3) and with a sleeve (2), which is inserted into the spark plug tube and accommodates the spark plug. The spark plug tube is provided with an increased diameter (D) cut through at right angles to a longitudinal direction thereof. A process for manufacturing such a cylinder head is described, in which the internal diameter (d) of the spark plug tube (1) is first increased to a diameter (D) that is larger than the external diameter of the sleeve (2) by a material-removing process, the spark plug tube (1) is subsequently cut through at right angles to its longitudinal direction, and the sleeve (2), wetted with the permanently elastic sealant, is finally inserted into the spark plug tube (1) and is adjusted therein.

Abstract: A collecting exhaust port 18 provided in a cylinder head 12 is comprised of exhaust port sections 46 extending from exhaust valve bores 35 in cylinders 14, and an exhaust collecting section 47 in which the exhaust port sections 46 are collected. The cylinder head 12 includes a protrusion 49 projecting in an arch shape outside a side wall 111 of a cylinder block 11. The exhaust collecting section 47 of the collecting exhaust port 18 directly faces an inner surface of a side wall 12 of the protrusion 49. Water jackets J2 and J3 for cooling the protrusion 49 are provided in upper and lower surfaces of the protrusion 49 having the collecting exhaust port 18 defined therein. The water jackets J2 and J3 are not provided between the side wall 121 of the protrusion 49 and the exhaust collecting section 47. Thus, the compact cylinder head 12 having the collecting exhaust port 18 integrally provided therein can be formed, while avoiding the complication of the structure of a core.

Abstract: The present invention relates to an optical engine comprising a cylinder head of an industrial engine and a transparent cylinder. According to the invention, the transparent cylinder is tightly applied to the cylinder head by pneumatic means, a jack for example, allowing easy dismantling and cleaning of the cylinder. Furthermore, the industrial cylinder head is mounted on a support secured to the frame of the <<engine bottom>> by jacks or equivalent means, at least one of these means being pneumatic for opening the engine.

Abstract: An internal combustion engine with two camshafts (4, 5) arranged side by side in the cylinder head (1), each having a mechanism (8, 9) for varying the control timing of gas exchange valves is provided. The feeding and discharge of the hydraulic pressure medium to and from the mechanisms (8, 9) takes place through electromagnetic control valves (15, 16), each including a cartridge which can be inserted into a valve holder (19, 20) and an attached electromagnet (23, 24) which has an electrical socket (27, 28) located on its clear front side (25, 26). The valve holders (19, 20) are constructed as separate flanged connectors which are situated directly above the bearings of the camshafts (4, 5) on the cylinder head of the engine in such a way that the control valves (15, 16) are situated beside each other with their cartridges facing away from each other and with their electromagnets (23, 24) facing each other along a common longitudinal axis running transverse to the longitudinal axis of the camshafts (4, 5).

Abstract: To provide a valve system for an engine, in which a valve stem for an engine valve is slidably fitted in a guide cylinder provided in a cylinder head. A rocker arm is interlocked to rock with rotation of a camshaft. The rocker arm is also interlocked with the valve stem. With the above construction, local wear, galling, and the like in the guide cylinder can be prevented. Accordingly, the reliability can be improved. A lifter is interposed between a rocker arm and a valve stem. The lifter is formed into a cylindrical shape with a closed bottom and has a diameter larger than an outside diameter of the valve stem. The lifter is fitted in a lifter housing in such a manner as to be slidable in the axial direction of the valve stem. The lifter housing is fixed to a cylinder head.

Abstract: In multi-cylinder engine in which an intake valve and a first spark plug arranged side by side along an axis of a camshaft and an exhaust valve and a second spark plug arranged side by side along the axis of the camshaft are disposed in a cylinder head for every combustion chamber, the position of a central portion of an upstream end of an intake port provided in the cylinder head with the intake valve interposed between the intake port and each of the combustion chambers and the position of a central portion of a downstream end of an exhaust port provided in the cylinder head with the exhaust valve interposed between the exhaust port and each of the combustion chambers are set to correspond with each other in the direction along the axis of the camshaft. Thus, it is possible to provide a reduction in size of the cylinder head in a direction along the axis of the camshaft.

Abstract: A cylinder head for a valve-controlled internal combustion engine with a cylinder head housing, in which there are bearing blocks for the inlet or outlet camshaft. At least one camshaft has a camshaft adjuster, by way of which the position of the drive wheel of the camshaft can be changed relative to the axis of rotation of the camshaft. At least the bearing block, which is provided next to the camshaft adjuster and is intended for the camshaft, exhibits a segment, whose width is reduced owing to a recess for the screw connection of the cylinder head housing. The bearing site, arranged next to the camshaft adjuster, provides a bearing sleeve for the camshaft, in such a manner that the segment of the bearing block that is provided with a reduced bearing block width is expanded to the actual bearing block width. The sleeve exhibits openings to supply oil for the camshaft adjuster.

Abstract: An engine modification particularly suitable for permitting an engine, which initially ran on diesel fuel (diesel cycle) to run on gasoline (Otto cycle), includes a spacer plate connected between a cylinder head and the engine block for lowering the compression ratio of the engine. The inlet gas flow is modified so that the combustion charge introduced into the cylinder through at least one inlet valve is caused to move around the combustion chamber so that, during the period of the spark, much of the charge passes close to the spark plug to thereby obtain efficient burning of the combustion charge. A spacer plate for causing the required movement of the gas being introduced is also disclosed.

Abstract: A DOHC diesel engine cylinder head includes a plurality of combustion chamber head sections having the same configuration, two camshafts rotationally mounted over the combustion chamber head sections, each having cam lobes for activating intake and exhaust valves, synchronizing means for driving the camshafts, the synchronizing means being connected to the camshafts, a camshaft carrier mounted on a top surface of the cylinder head for supporting the camshafts, and a valve cover for covering the cylinder head.

Abstract: In a monoblock cylinder head for an engine, in which a cylinder upper end portion and a cylinder head ceiling portion are formed integrally with each other, an annular groove portion, having such a radius of curvature as to be capable of supporting load generated by combustion in a combustion chamber within a cylinder, is circumferentially provided in an inner circumferential surface of a joining portion of an upper end portion of a cylinder wall portion to the cylinder head ceiling portion, and an engagement member, having an inner circumferential surface portion capable of forming substantially the same plane as a cylinder interior surface, is engaged with this annular groove portion.

Abstract: The object of the present invention is to provide a mono-block cylinder head structure of a water cooled engine which can effectively prevent a reduction in strength of a joint portion due to a concentration of stress of a combustion load on the joint portion between a cylinder portion and a cylinder head ceiling portion without reducing the cooling efficiency by a water jacket, the structure being provided with a water jacket having a water jacket outer wall covering a cylinder upper end portion and a cylinder head ceiling portion in a water cooled engine wherein a reinforcing rib is provided in said Joint portion with said cylinder upper end portion and said cylinder ceiling portion to hold the load generated by combustion in a combustion chamber in said cylinder and release the beat generated by said combustion to a water jacket.