Abstract: A two-plane type crankshaft is provided. The weight of crank webs for the respective cylinders is divided between left and right half webs and balance ratios kL and kR of the half webs for the respective cylinders are set so as to be (kL?0.25)·(0.25?kR)?DR/DL to form a track of a vector of a primary inertial couple into a substantial circle. A primary balancer offsets the primary inertia couple.

Abstract: In a balancer apparatus of an engine having an oil pump, a space on a chain side and a space on an oil strainer side are partitioned by a projecting portion projecting in a direction which perpendicularly crosses balancer shafts in a balancer housing formed on an oil pump housing. An oil strainer is attached to a side wall on the anti-chain side of the projecting portion, and a chain tensioner for applying tension to a chain is arranged in the space on the chain side formed by enlarging the attaching surface of the oil pan outwardly so as to enclose the projecting portion. Thus oil which has been stirred by the chain and in which air has been mixed is prevented from being sucked into the oil strainer.

Abstract: An engine balancer system is provided in which a balancer housing (17) disposed so as to face an oil pan beneath a crankshaft is formed by joining an upper housing (29) and a lower housing (30) via mating faces (P), and the height of the mating faces (P) is lower on a vehicle front side than on a vehicle rear side. Oil discharge holes (45a, 46) for discharging oil that is within the balancer housing (17) are formed in the mating faces (P) on the higher side of the balancer housing (17) and in the upper housing (29) above the mating faces (P) on the lower side of the balancer housing (17). This enables the position of the oil discharge hole (45a) on the lower side to be as high as possible, thereby suppressing penetration of oil into the interior of the balancer housing (17) through the oil discharge hole (45a).

Abstract: Balance shaft for a piston engine comprises a bearing journal, on which the balance shaft is supported, a gear section, on which a gear is connected in a rotation-locked manner thereto via a press fit or another shaft-hub-connection, and an unbalanced section having an integrally connected unbalanced mass or an unbalanced mass fastened on this unbalanced section using machine elements or via another shaft-hub connection. The balance shaft can alternately comprise steel or cast iron material in the case of a friction mounting and its bearing journals can alternately be implemented as hardened or also unhardened. If the balance shaft is mounted in roller bearings and if the roller bodies have direct contact with the bearing surface, it is implemented in a suitable steel and the bearing journals are hardened. The gear comprises nodular cast iron and is not hardened.

Abstract: A power unit for a motorcycle includes an internal combustion engine provided with a crankcase rotatably supporting a crankshaft with an axial line extending in a vehicle-width direction. An oil pump is mounted on the crankcase with a balancer rotatably supported by the crankcase. Rotational power from the crankshaft is transmitted to a pump driven member provided on a pump shall of the oil pump and to a balancer driven member coaxially interlinked with and connected to the balancer so as to transmit power to the balancer. The power unit is downsized by bringing a balancer and an oil pump into a close arrangement. The pump driven member and the balancer driven member are offset from each other in a vehicle-width direction and are located at such a position so as to at least partially overlap each other as viewed from the side of the vehicle-width direction.

Abstract: A split-cycle internal combustion engine is disclosed. The engine includes a cylinder block, and a plurality of cooperating power pistons and cylinders mounted in the cylinder block. The power pistons are configured to be energized by forces of combustion. The engine also includes a compressor piston and cylinder configured to compress a volume of air and transfer the compressed air to the power pistons, and an expander piston and cylinder configured to receive exhaust gases from the power pistons. The engine additionally includes a first crankshaft operatively connected to and rotatably driven by the power pistons, a second crankshaft operatively connected to the compressor piston and configured to rotatably drive the compressor piston, and a third crankshaft operatively connected to the expander piston and configured to be rotatably driven by the expander piston. The first, second, and third crankshafts are operatively connected to each other for coordinated rotation.

Abstract: An engine structure is provided with a bedplate and an oil pan. The bedplate is configured to have an integrally formed balance shaft bearing support. A bearing cap is either a separate component or a component that is formed as an integral part of the oil pan. The bearing cap and the balance shaft bearing support structures are attachable to each other to capture the bearing portions of the balance shafts therebetween.

Abstract: In an internal combustion engine having a pair of balancer shafts (53, 54), an engine torque is transmitted from a crank gear (28) to an oil pump gear (74) on a drive shaft (73) of an oil pump (71) via a first idler gear (84) and the first balancer shaft gear (64). The engine torque is also transmitted to a fuel pump (72) from the crank gear to a fuel pump gear (78) via the first idler gear and a second idler gear (86), and to the second balancer shaft gear (67) via the first idler gear and second idler gear. Alternatively, the engine torque may be transmitted to the fuel pump from the crank gear to the fuel pump gear via the first idler gear, second balancer shaft gear and second idler gear. As the oil pump gear is actuated by the crank gear via the first idler gear, the oil pump gear is not subjected to the loading caused by the balancer shaft, and hence can be made of a compact and light-weight gear.

Abstract: An engine balancer system is provided in which a balancer housing (17) disposed so as to face an oil pan beneath a crankshaft is formed by joining an upper housing (29) and a lower housing (30) via mating faces (P), and the height of the mating faces (P) is lower on a vehicle front side than on a vehicle rear side. Oil discharge holes (45a, 46) for discharging oil that is within the balancer housing (17) are formed in the mating faces (P) on the higher side of the balancer housing (17) and in the upper housing (29) above the mating faces (P) on the lower side of the balancer housing (17). This enables the position of the oil discharge hole (45a) on the lower side to be as high as possible, thereby suppressing penetration of oil into the interior of the balancer housing (17) through the oil discharge hole (45a).

Abstract: A mass balancing device (1a, 1b) for a reciprocating piston internal combustion engine is provided, having a first balancing shaft (2a, 2b) and a second balancing shaft (3a, 3b) disposed in the first balancing shaft coaxially thereto. The first balancing shaft (2a, 2b) has at least one bearing point (6a, 7a, 6b, 7b) for a first rolling bearing (16) and the second balancing shaft (3a, 3b) has at least one bearing point (8a, 9a, 8b, 9b) for a second rolling bearing (17). The rolling bearings radially support the balancing shafts in the reciprocating piston internal combustion engine. At least one of the bearing locations is designed as a hollow cylinder having an outer shell surface serving as the bearing seat for the first rolling bearing and an inner shell surface serving as the bearing seat for the second rolling bearing, such that the first rolling bearing and the second rolling bearing overlap one another axially.

Abstract: A balance shaft module of an engine may include a balance weight shaped eccentrically in a radial direction from the axial center of a balance shaft, and a balance cover combined with the balance weight and defining a circumferentially-uniform outer surface with the balance weight with respect to the axial center of the balance shaft.

Abstract: A vibration damper includes a hub, a first mass, a first resilient coupling, a second mass, and a second resilient coupling. The first mass is disposed concentrically about the hub. The first resilient coupling resiliently couples the first mass to the hub. The first resilient coupling has a first spring constant. The second mass is disposed concentrically about the first mass. The second resilient coupling resiliently couples the second mass directly to the first mass. The second resilient coupling has a second spring constant that is less than the first spring constant. The first mass and the first resilient coupling are configured to attenuate vibration at a first frequency. The second mass and the second resilient coupling are configured to attenuate vibration at a second frequency. The second frequency is lower than the first frequency.

Abstract: A method for securing a balancer shaft module to an engine is provided, the method including the steps of passing a mounting feature into at least two mounting apertures of the balancer shaft module; simultaneously rotating two of the mounting features within the mounting aperture, wherein the simultaneous rotation of the two mounting features laterally moves the balancer shaft module with respect to the engine; and securing the balancer shaft module to the engine.

Abstract: In an engine, an oil level sensor (47) provided in a bottom part of an oil pan (15) storing engine oil so as to stand vertically upright is placed between a mutually parallel pair of balancer shafts (27, 28) housed in a balancer housing (21) provided between a lower face of a cylinder block and the oil pan (15). This not only enables the oil level sensor (47) to be placed compactly by utilizing effectively dead space formed between the pair of balancer shafts (27, 28), but also enables agitation of engine oil to be suppressed by the pair of balancer shafts (27, 28) and any degradation in detection precision due to engine oil splashing over the oil level sensor (47) to be prevented.

Abstract: A mass balancing mechanism and a method of assembly of the same is provided. The mass balancing mechanism serves to compensate mass forces and/or mass moments of inertia of an internal combustion engine and includes two compensation shafts (1, 2) rotating in opposite directions and further includes a traction drive which connects a driven pinion (5) of the crankshaft (3) of the internal combustion engine to drive pinions (6, 7) of the compensation shafts through a chain (4) or a toothed belt. Rotation of the compensation shafts in opposite directions is achieved through a spur gearing (8) with two meshing spur gears (9, 10) arranged between one of the drive pinions and the associated compensation shaft (1), one of the spur gears being connected rotationally fast to the one drive pinion and the other of the spur gears being connected rotationally fast to the associated compensation shaft.

Abstract: In a method for reducing rotational non-uniformities of the crankshaft of a piston internal combustion engine, a movable balancing mass component is coupled to the crankshaft in such a way that the kinetic energy of the mass component increases in phases in which the angular speed of the crankshaft would increase if said crankshaft were not coupled to the balancing mass part, and decreases in phases in which the angular speed of the crankshaft would decrease if said crankshaft were not coupled to the balancing mass component.

Abstract: A heat engine including at least one engine block that rotatably receives a crankshaft and a cartridge fixed to the engine block and that rotatably receives a pair of parallel balance shafts, namely a primary shaft and a secondary shaft, which are rotated by the crankshaft. A ring gear is rotationally connected to the crankshaft, permanently meshing with a first pinion borne by one end of the primary balance shaft. In addition, a second pinion, borne by the end of the primary balance shaft, meshes with a pinion borne by one end of the secondary balance shaft. Transverse holes extend through the ends of the primary and secondary balance shafts and are configured to be aligned with one another, before the cartridge is mounted to the engine block, to receive a pin.

Abstract: The present application relates to a drive and balance mass. In one example, an engine includes, a camshaft, a balance shaft disposed within an interior of the camshaft, and a first gear, intermediate the balance shaft and the camshaft and driving the balance shaft to rotate about a first axis substantially parallel to a crankshaft of the engine in a direction opposite of the crankshaft. In another example, a balance mass and drive for an engine includes, a planetary gear set including a sun gear, a ring gear and a plurality of pinions mounted on a carrier, an input coupled to an input gear of the planetary gear set, a balance mass coupled to an output gear of the planetary gear set, the output gear configured to drive the balance mass to rotate about a first axis substantially parallel to the crankshaft in a direction opposite of the crankshaft.

Abstract: An engine balancer system is provided in which a balancer housing (17) disposed so as to face an oil pan beneath a crankshaft is formed by joining an upper housing (29) and a lower housing (30) via mating faces (P), and the height of the mating faces (P) is lower on a vehicle front side than on a vehicle rear side. Oil discharge holes (45a, 46) for discharging oil that is within the balancer housing (17) are formed in the mating faces (P) on the higher side of the balancer housing (17) and in the upper housing (29) above the mating faces (P) on the lower side of the balancer housing (17). This enables the position of the oil discharge hole (45a) on the lower side to be as high as possible, thereby suppressing penetration of oil into the interior of the balancer housing (17) through the oil discharge hole (45a).

Abstract: A camshaft assembly may include a first shaft adapted to be rotationally driven, a first lobe member fixed for rotation with the first shaft, and a torsional damper fixed to the first shaft. The torsional damper may include a mass structure fixed to the first shaft and an elastic member disposed between and coupling the mass structure and the first shaft. The elastic member may have a spring constant providing a first sideband natural frequency and a second sideband natural frequency for the camshaft assembly.

Abstract: Secondary vibration generated accompanying reciprocation of a piston (21) of a multi-link variable compression ratio engine (E) can be eliminated effectively, even when the direction of the secondary vibration is inclined relative to a cylinder axis (L1), by inclining the direction (shown by arrow) of an excitation force generated by a secondary balancer system (43) so that it coincides with the direction of the secondary vibration. The secondary balancer system (43) is formed by supporting balancer weights (44a, 45a) on a pair of balancer shafts (44, 45) rotating in directions opposite to each other, and by displacing the phases of these balancer weights (44a, 45a) the direction of the excitation force generated can be inclined so as to coincide with the direction of secondary vibration of the engine (E).

Abstract: A pump chamber is arranged on the side of a balancer shaft on a vehicle backward side of the two balancer shafts. An oil strainer for sucking oil into an inlet passage is arranged on a vehicle forward side of the axis of the balancer shaft on the vehicle forward side of said two balancer shafts. The inlet passage and the delivery passage are overlaid in the vertical direction and oriented to one side in the circumferential direction of the pump chamber, and the inlet passage and the delivery passage are arranged in a state where they are rectilinearly extended from the pump chamber in the vehicle forward direction.

Abstract: A mass balancing mechanism of an internal combustion engine, in which the mechanism includes a compensation shaft (1, 1?) formed as a tubular carrier shaft (5, 5?) having a mounting point (10, 10?) for the radial mounting of the compensation shaft. The mechanism further includes an unbalanced mass (6) joined to the carrier shaft. A needle roller bearing (2) is used for a radial rolling bearing-mounting of the compensation shaft, with the needle rollers (11) of the needle roller bearing being in rolling contact with the mounting point which is configured as an inner raceway and possesses a width which is variable in peripheral direction, so that, in a region situated diametrically opposite a load zone in whose peripheral region the inner raceway is loaded by the radial load of the unbalanced mass which rotates together with the compensation shaft, a width (14) of the inner raceway is smaller than the length of the needle rollers and tapers clearly or is interrupted in peripheral direction.

Abstract: A tensioner for applying tension to a balancer drive chain is mounted in a balancer housing which accommodates balancer shafts. Oil is supplied from a reservoir chamber to the tensioner. An oil jet member for lubricating the balancer drive chain is mounted at a position downstream in an oil flow direction from the reservoir chamber. Therefore, while enabling foreign matter contained in the oil to be discharged from the oil jet member without being accumulated within the tensioner, a predetermined pressure can be maintained in the reservoir chamber by a resistance to the flow of oil passing through the oil jet member. Also, a constriction is provided between the reservoir chamber and the oil jet member. Therefore, it is difficult for the oil to flow out of the reservoir chamber even after stoppage of an engine, thereby supplying the oil to the tensioner upon the next start of the engine without delay. Thus, it is possible to prevent the foreign matter from entering the tensioner for the balancer drive chain.

Abstract: An unbalanced shaft (1a, 1b, 1c), particularly for compensating mass forces and/or mass moments of inertia of an internal combustion engine (2) is provided. The shaft includes a shaft section (10, 11, 12) and a bearing journal (13a, 13b, 13c) axially adjacent to the shaft section, the bearing journal includes a fully cylindrical outer peripheral surface (18) serving as an inner raceway for the rolling elements (16) of a rolling bearing (14) and the bearing journal has a multi-piece configuration, so that both the shaft section and the bearing journal possess a mass center of gravity that, for producing the shaft unbalance, extends eccentric to the axis of rotation (19) of the unbalanced shaft. For supplying lubricant to the inner raceway and the rolling elements, an oil channel (20a, 20b, 20c) extends radially outwards through the bearing journal and opens, relative to the mass center of gravity of the bearing journal, on the other side, situated beyond the axis of rotation, on the outer peripheral surface.

Abstract: An engine balancer device is provided that can prevent an increase in the number of component parts and the enlargement of an engine. The balancer weight includes a primary balancer 201 rotated at the same speed as, and in a counter direction to a crankshaft 105 and a coupling balancer for suppressing moment force resulting from the reciprocative weight of the engine 17. The coupling balancer is integrally provided on a driven gear 177 for transmitting rotation of the crankshaft 105 to the primary balancer 201.

Abstract: An internal combustion engine having a crankshaft and first and second balance shafts which are gear driven from one to the other, as a unilateral tensioning system applied to a flexible drive extending between the engine's crankshaft and a first one of the balance shafts, with the unilateral tensioning system being applied to the tension side alone of the flexible and inextensible drive element.

Abstract: An internal combustion engine having a piston reciprocating in a cylinder between TDC and BDC positions to influence a drive shaft. The drive shaft is associated with an expandable piston rod extension which in turn attaches to a piston rod to connect the piston with the drive shaft. The piston rod extension's length may increase and decrease in accordance with the angular position of the drive shaft. The increasing and decreasing length is governed by a guide pin which travels within a channel formed by a portion of the engine block. Increasing the length of the piston rod extension during the power phase of the engine increases the available torque of the engine without any alteration of the displacement. The assembly may also include a counterweight, which itself may travel along an eccentric path generally equal and opposite to the eccentric path along which the piston rod extension guide travels.

Abstract: An engine balancer system is provided in which a balancer housing (17) disposed so as to face an oil pan beneath a crankshaft is formed by joining an upper housing (29) and a lower housing (30) via mating faces (P), and the height of the mating faces (P) is lower on a vehicle front side than on a vehicle rear side. Oil discharge holes (45a, 46) for discharging oil that is within the balancer housing (17) are formed in the mating faces (P) on the higher side of the balancer housing (17) and in the upper housing (29) above the mating faces (P) on the lower side of the balancer housing (17). This enables the position of the oil discharge hole (45a) on the lower side to be as high as possible, thereby suppressing penetration of oil into the interior of the balancer housing (17) through the oil discharge hole (45a).

Abstract: A combination dynamic balancer and fuel pump for an internal combustion engine includes a common housing having at least one balancer shaft and a fuel pump, with the fuel pump having the pumping element mounted directly within a working chamber formed within the housing for the balancer shaft and fuel pump. A pumping element may include a reciprocating or a rotary pumping element.

Abstract: A method of operating an engine having an adjustable balance shaft may comprise adjusting operation of the balance shaft during engine operation in response to an engine combustion mode. For example, balance shafts may be disabled during SI mode and enabled during HCCI mode. Various alternative examples may also be used.

Abstract: A mass balancing mechanism for balancing mass forces and/or mass torques of an internal combustion engine, said mechanism comprising a balancing shaft comprising an axis of rotation, a mass center of gravity spaced from said axis of rotation and further comprising at least one bearing peg on which said balancing shaft is mounted for rotation in a mounting location of the internal combustion engine, the bearing peg includes two axially spaced cylindrical bearing peg sections that define a recess which extends substantially or entirely outside of the axis of rotation relative to the mass center of gravity.

Abstract: A method, a device utilizing the method, and a motorcycle equipped with the device are provided, of controlling combustion of an engine to have an engine beat different from an equally-intervalled combustion. The method of controlling combustions of an engine having three or more pistons of cylinders per crankshaft includes causing simultaneous combustions of two cylinders among the three or more cylinders, the two cylinders having the same crank phase angle, causing a combustion of at least one -other cylinder, and in the process of said combustion offsetting a crank phase angle by a first crank phase angle, and repeating from the combustions of the first two cylinders further offsetting the crank phase angle by a second crank phase angle from the first crank phase angle.

Abstract: The invention relates to a balancing shaft for a multi-cylinder engine having at least one unbalanced weight portion (21, 22; 23, 24) and at least one bearing (16, 17), the at least one unbalanced weight portion (21, 22; 23, 24) being associated with the bearing (16, 17) and the bearing (16, 17) has a radial running face (18) which extends only partially over a periphery of the bearing (16, 17) and a centrifugal force which results during rotation of the balancing shaft (11) is situated within a region of the bearing (16, 17) that is formed by the running face (18) which extends partially over the periphery of the bearing (16, 17), wherein a running ring segment (51) is associated with the partially formed running face (18), said running ring segment adjoining the partially formed running face (18) of the bearing (16, 17) and forming, together with said partially formed running face (18), a completely closed running face (20) of the bearing (16, 17) and having at least one lateral edge (54) which delimits the

Abstract: An internal combustion engine can comprise a crankcase, and a crankshaft rotatably supported in the crankcase. The crankshaft includes a drive sprocket attached thereto. A cam chain engages the drive sprocket, and a cam chain chamber houses at least a part of the drive sprocket and cam chain therein. The cam chain chamber is configured to pool oil in a lower portion thereof. A balancer is coupled to the crankshaft and is configured to be rotated by rotational power transmitted from the crankshaft. The balancer is also disposed within the cam chain chamber, and is configured to splash oil pooled in the cam chain chamber during the rotation thereof. The engine also comprises a wall portion disposed in the cam chain chamber. The wall portion is configured to cover an upper portion of the balancer, and is disposed adjacent to a periphery of the balancer.

Abstract: A machine includes at least one piston (1) reciprocally movable in a cylinder (2), at least two balancing rotors (3c, 3d) mounted for oscillating rotational movement about an axis or axes (4) transverse to the axis of motion of the piston, one balancing rotor having a centre of mass on one side of and another balancing rotor having a centre of mass on an opposite side of the axis or axes of motion of the rotors, and at least one connecting member or mechanism between the piston and rotors so that the rotors move in opposition to the reciprocal movement of the piston. The machine may be an electrical machine such as an electric motor or generator. An electronic control system may control piston motion or output waveform.

Abstract: A balancer of an engine includes a rod and a balancer piston. A first end portion of the rod includes a joining portion which is arranged to be joined to a crankshaft of the engine at a position that is eccentric relative to a rotation axis of the crankshaft. A second end portion of the rod is arranged to reciprocate inside a cylinder according to a rotation of the crankshaft. The balancer piston is fixed to the second end portion of the rod. The balancer piston is arranged to reciprocate inside the cylinder, while rocking between a contact state in which the balancer piston is in contact with an inner wall surface of the cylinder and a non-contact state in which the balancer piston is separated from the inner wall surface. The balancer piston includes a cylindrical outer peripheral portion that is curved so as to swell toward the inner wall surface.

Abstract: A combination dynamic balancer and fuel pump for an internal combustion engine includes a common housing having at least one balancer shaft and a fuel pump, with the fuel pump having the pumping element mounted directly within a working chamber formed within the housing for the balancer shaft and fuel pump. A pumping element may include a reciprocating or a rotary pumping element.

Abstract: A bearing system can reduce the relative velocity between a bearing member and a rotation shaft and a rotating member to decrease a load on the bearing member although the rotation shaft and the rotating member rotate in opposite directions with the bearing member therebetween. The bearing system includes a case and a rotation shaft supported by the case. A rotating member is disposed coaxially outside the rotation shaft and rotates in the direction opposite to that of the rotation shaft. A housing is interposed between the rotation shaft and the rotating member and is fixed to the case. A bearing member that rotatably supports the rotating member is interposed between the housing and the rotating member.

Abstract: An engine balancer includes a pair of balancer shafts and a balancer housing for housing the balancer shafts, and is placed in an oil pan at the bottom of an engine. The balancer housing includes a pair of front and rear bearing walls respectively supporting the balancer shafts with rolling bearings interposed therebetween. The bearing walls of the balancer housing are attached to bearing walls for a crankshaft. The housing body has an aperture at the top thereof. The aperture of the housing body is covered with a plate-shaped cover member thinner than a member forming the housing body.

Abstract: A balance shaft housing is provided that includes a first housing portion, a second housing portion operatively connected to the first housing portion, with the first housing and the second housing configured to cooperatively define first and second balance shaft chambers. A cover member is secured to the second housing portion and cooperates with the first and second housing portions to define an air flow path outside of the chambers for circulating air to the balance shaft chambers. A method of assembling a balance shaft housing is also provided.

Abstract: The present invention features, generally, an oil discharging structure of a balance shaft module which can smoothly discharge oil pumped by a balance shaft outside of the balance shaft module by forming an oil guide surface in a ladder frame that is installed in an upper part of the balance shaft module. The oil discharging structure of the present invention preferably includes a balance shaft housing that is rotatably supported with a balance shaft inserted therein; oil discharge holes formed in the balance shaft housing so that oil in the balance shaft housing is discharged to the outside by the balance shaft; and an oil guiding means that is provided in a ladder frame mounted on an upper part of the balance shaft housing in order to induce the oil discharged through the oil discharge holes to the outside of the balance shaft housing.

Abstract: A baffle plate includes a discharge portion that discharges lubricating oil that has dropped onto the baffle plate, to an oil pan. The discharge portion extends to be inclined in a direction in which cylinders are arranged, with respect to a rotation central axis of a crankshaft. The discharge portion includes a guide groove in which an upstream portion in a rotational direction of the crankshaft is located under a counter weight, and a downstream portion in the rotational direction of the crankshaft is located under a crank bearing. The discharge portion includes a discharge hole that is formed in the downstream portion of the guide groove in the rotational direction, and that provides communication between the oil pan and an engine block.

Abstract: The present invention is directed to a balance shaft module for a vehicle. In the balance shaft module of the present invention, an intermediate gear is covered by a baffle cover, thus making it possible to prevent air from mixing into the engine oil when an intermediate gear rotates. Further, since an intermediate gear is supported with increased support force by a gear shaft, to the present invention provides a reduction in noise and frictional wear and improves durability while considerably improving the NVH (Noise Vibration Harshness) performance of a vehicle.

Abstract: The invention relates to a balancing shaft for a single-cylinder or multi-cylinder engine having at least one unbalanced weight portion (21, 22; 23, 24) and at least one bearing (16, 17), the at least one unbalanced weight portion (21, 22; 23, 24) being associated with the bearing (16, 17) and the bearing (16, 17) having a radial running face (18) which extends only partially over a periphery of the bearing (16, 17) and a centrifugal force which results during rotation of the balancing shaft (11) is situated within a region of the bearing (16, 17) that is formed by the running face (18) which extends partially over the periphery of the bearing (16, 17), wherein provision is made for at least one supporting surface (51) to extend partially over the periphery of the bearing (16, 17) and to be provided separate from the running surface (18).

Abstract: A balance shaft includes a housing that is disposed under an engine and a first hole is formed thereto, a balance shaft that is disposed to the housing and a second hole is formed thereto and a mounting pin that is inserted into the first hole through the second hole for mounting the balance shaft.

Abstract: An automobile engine crankshaft that affords further weight reduction of an arm formed integrally with a balancer. The automobile engine crankshaft of the present invention constitutes a structure in which a hollow shaft-shaped journal (15) and pin (14), and an arm (10) formed integrally with a balancer (11) are individually manufactured, and in which ring-shaped bearings are assembled on each of the journal (15) and the pin (14).

Abstract: The invention relates to a method for the production of a drop-forged balancing shaft for a mass balancing gear of an internal combustion engine. The balancing shaft has an unbalanced plane formed by the rotational axis thereof and an eccentric mass center of gravity, and at least one bearing journal, the outer lateral surface of which serves as a track for a rolling bearing supporting the balancing shaft in the internal combustion engine. To this end, the balancing shaft is to be forged in a forging die having a parting plane extending in the direction of the rotational axis and rotated in relation to the unbalanced plane.

Abstract: A balancing shaft unit for balancing inertia or torque in an internal combustion engine of a motor vehicle. The balancing shaft unit includes a housing part and at least one balancing shaft having at least one counterweight. The housing part is made in one piece and has at least two integrated bearing sections with a respective bearing opening. A respective cut-out is formed at longitudinal ends of the balancing shaft in which a respective bearing pin is arranged that is rigidly connected to the balancing shaft and which has a cylindrical bearing section that is supported in a respective one of the bearing openings.

Abstract: In an engine, an oil level sensor (47) provided in a bottom part of an oil pan (15) storing engine oil so as to stand vertically upright is placed between a mutually parallel pair of balancer shafts (27, 28) housed in a balancer housing (21) provided between a lower face of a cylinder block and the oil pan (15). This not only enables the oil level sensor (47) to be placed compactly by utilizing effectively dead space formed between the pair of balancer shafts (27, 28), but also enables agitation of engine oil to be suppressed by the pair of balancer shafts (27, 28) and any degradation in detection precision due to engine oil splashing over the oil level sensor (47) to be prevented.