9 results about "Engine balance" patented technology

This invention discloses a method for calculating and evaluating gear knocking on balance shaft scissor teeth, comprising the following steps: constructing a rigid model of an engine balance shaft system; performing mesh generation to obtain a finite element model; setting condensed nodes on the finite element model and coupling the condensed nodes with the contact boundaries; performing condensation processing on the finite element model and using the generated condensed model to replace the finite element model for mechanical analysis; making the gears flexible; applying excitations at various speeds on the crankshaft and starting simulation calculations; extracting the meshing force on the tooth surface of each gear pair at each speed; processing the meshing force data to obtain the peak meshing force, obtaining the impact index based on the peak meshing force, and obtaining the knocking evaluation based on the impact index. The method described in this invention can establish a fully flexible balance shaft system simulation model and quantitatively evaluate the knocking noise of balance shaft scissor teeth, providing a basis for the analysis and optimization of gear knocking problems on balance shaft scissor teeth.

The application provides a method for solving rough sound of an engine balance shaft, comprising the following steps: S1, performing NVH test on the engine to determine the approximate position of the rough sound source; S2, designing a cylinder cut-off test and canceling a balance shaft test for the engine to be tested to determine that the rough sound is caused by torsional vibration excitation; S3, establishing a CAE simulation analysis model capable of viewing torsional vibration of each position of a crankshaft, and using the established CAE simulation analysis model to perform cylinder cut-off simulation analysis on the engine to be tested to determine the influence of cylinder cut-off of each cylinder of the engine to be tested on the balance shaft excitation; and S4, replacing the installation position of the balance shaft on the crankshaft of the engine to be tested, and using the CAE simulation analysis model to analyze the rough sound of the balance shaft installed at different positions to determine the optimal installation position of the balance shaft which can generate the optimal rough sound.

The utility model discloses a two-stroke engine crankshaft balance shaft structure which comprises a crankshaft assembly and a balance shaft assembly, a driving gear used for driving the balance shaft assembly to rotate is arranged in the crankshaft assembly, and the balance shaft assembly comprises a rotating shaft. The driven gear is mounted at the end part of the rotating shaft, and the driven gear is meshed with the driving gear in the crankshaft assembly; the balance block is mounted at the end part of one end, far away from the driven gear, of the rotating shaft; the balancing weight is mounted on the side wall of the driven gear; the engine balance shaft assembly has the beneficial effects that the working effect of the balance shaft assembly can be ensured without arranging a plurality of balance blocks in the balance shaft assembly, so that the weight of the balance shaft assembly is reduced, and the weight of an engine is further reduced.

The utility model discloses engine balance box assembling equipment which comprises a machine frame and a chain conveyor erected on the machine frame, and an operation tool which is used for assembling all parts of an engine balance box and serves as an assembling operation platform is arranged on the machine frame in a driving and sliding mode through the chain conveyor. A balance shaft grabbing mechanism, a phase detection mechanism, a marking mechanism, a bolt feeding mechanism and a tightening assembly mechanism are sequentially arranged on the rack in the conveying direction of the chain conveyor, and the whole assembly process that a balance shaft of an engine balance box is placed to a box body to be assembled is achieved. The limiting assembly is used for limiting and stopping when the operation tool arrives at the position of the corresponding assembling mechanism, and the supporting assembly is used for fixing and shoring when the operation tool is assembled so that the operation tool can be separated from the chain conveyor. Each assembly step of the engine balance box is completed step by step at a corresponding station, so that the uninterrupted assembly operation is ensured, the production efficiency of the engine balance box is greatly improved, the automation degree is high, and the labor intensity of workers is reduced.

This utility model discloses a motorcycle engine balancing driven gear structure, including a driven gear and a secondary gear. The driven gear has several first grooves, and the secondary gear has several second grooves. The first and second grooves correspond one-to-one, and two corresponding grooves fit together to form a receiving cavity, within which a buffer element is provided. The first grooves and the corresponding second grooves are in clearance fit. A central shaft is provided on the driven gear, and the secondary gear is mounted on the central shaft. The driven gear and the central shaft are an integral structure. The advantages are: compared to traditional balancing driven gear structures, this solution uses more streamlined assembly components and a clever assembly arrangement. When gear meshing impact occurs, the instantaneous impact energy can be converted into controllable elastic deformation energy, thereby reducing vibration and noise, achieving system protection and improved stability.

The application provides an engine balance shaft steel and a preparation method thereof. The engine balance shaft steel comprises the following components in percentage by mass: C 0.44-0.46wt%, Si 0.25-0.35wt%, Mn 0.80-0.90wt%, P≤0.015wt%, S 0.010-0.025wt%, Al 0.015-0.025wt%, Cr 0.10-0.15wt%, and the balance is Fe and inevitable impurities. The engine balance shaft steel is prepared by using blast furnace molten iron with specific chemical components and content, through the molten iron pretreatment, converter smelting, ladle refining, vacuum degassing, continuous casting and rolling process, the engine balance shaft steel with high strength and high plasticity is obtained, wherein the tensile strength is greater than or equal to 710 MPa, the yield strength is greater than or equal to 400 MPa, the elongation after fracture is greater than or equal to 18%, and the reduction of area is greater than or equal to 47%.

The utility model provides a balance shaft noise detection device, and belongs to the technical field of mechanical tests. The balance shaft noise detection device comprises a test assembly and a fixed assembly, the fixed assembly is divided into a wind breaking part and a movable part, the test assembly is arranged in the fixed assembly, and the test assembly is divided into two test paths of an exterior line and an interior line to synchronously test noise of a balance shaft in a front cover and noise in a carriage. The fixing assembly is used for installing and fixing the device outside the vehicle during motion testing. According to the utility model, noise monitoring analysis can be simultaneously carried out near an engine balance shaft in a front cover and in a carriage, the front cover and a vehicle door are sealed under extrusion protection of vehicle exterior lines and vehicle interior lines, internal noise dissipation and external interference are prevented, external protection can be carried out on a test instrument, and the test efficiency is improved. And the device can be conveniently protected and fixed in an outdoor test state.

The utility model discloses a balance shaft of a motorcycle engine, which relates to the technical field of motorcycles, and is characterized in that two ends of the balance shaft are respectively inserted into inner rings of two balance shaft bearings in a clearance fit manner, and when the balance shaft rotates, the two ends of the balance shaft and the inner rings of the balance shaft bearings can generate relative rotation; therefore, the lateral thrust of the balance shaft acts on different points of the inner ring of the balance shaft bearing. The service life of the balance shaft bearing can be prolonged.

The application discloses a motorcycle engine balance shaft damping and anti-loose washer locking structure and belongs to the technical field of motorcycle engine balance shaft damping, which comprises a balance shaft, a bearing, a shaft sleeve, a key, a gasket, a special-shaped gasket, an anti-loose washer, a nut and a balance shaft gear assembly. The balance shaft gear assembly comprises a balance shaft gear, a bushing, springs and cylindrical pins. In the application, when the engine runs at high speed, the six springs and the three cylindrical pins in the balance shaft gear assembly can effectively buffer and absorb the instantaneous impact of the crankshaft transmitted to the balance shaft, greatly reduce the vibration and impact load caused by rigid transmission, reduce the stress abrasion of the balance shaft, and significantly improve the smoothness of the engine operation. Meanwhile, the lugs of the anti-loose washer are directly inserted into the balance shaft key groove to realize circumferential locking, which can effectively prevent the anti-loose washer and the nut from rotating and loosening, significantly enhance the locking force and fastening reliability of the nut, and avoid transmission failure caused by nut loosening.