44 results about "Engine balance" patented technology

The invention provides a calculation method and a test system for thrust coefficients of a pintle nozzle, and mainly aims to accurately measure the thrust coefficients of the pintle nozzle under different working conditions. The method comprises the following steps: on the basis of a pintle nozzle test model, according to an engine balance pressure calculation formula, calculating a corresponding thrust coefficient under a specified combustion chamber pressure; the test system applying the thrust coefficient calculation method comprises an engine combustion chamber, an ignition device, a servo control system, a sealing connection structure, a static frame, a movable frame, a thrust sensor and a bearing pier, the pressure intensity of the combustion chamber and the throat area of an engine can be accurately controlled in the test process, and the thrust coefficient of the spray pipe under the concerned working condition is obtained.

The utility model discloses a high-precision automobile engine balance weight which comprises a transmission ring, a bottom ring body, fixing columns, fixing holes, arc-shaped pieces, a counter weight frame, fixing pieces, adjusting notches, adjusting columns and adjusting blocks. The fixing holes are evenly formed in the top of the transmission ring, the fixing columns are connected into the fixing holes in a threaded fit mode, and the arc-shaped pieces are arranged on the arc-shaped pieces. The fixing columns are sleeved with through grooves evenly formed in the bottom ring body, and the bottom ring body is attached to the top of the transmission ring. During assembly, the fixing columns penetrate through the through grooves evenly formed in the bottom ring body and are connected into the fixing holes in the transmission ring in a matched mode, relative fixation of the transmission ring and the counter weight frame is achieved, the position of the counter weight structure relative to a transmission plane can be adjusted conveniently according to actual requirements, and the complex actual use requirements are met; the practicability of the balance block is improved; the centrifugal moment of the balance block can be adjusted by rotating the adjusting column under the condition that the rotating speed of the motor is not changed, and the universality of the balance block is improved.

The present invention discloses a method for analyzing and optimizing the gear knocking of an engine balance shaft system, comprising the following steps: studying the gear knocking vibration noise of the engine balance shaft system through a bench test; establishing a dynamic model of the engine balance shaft system; analyzing the dynamic characteristics of the gear knocking of the system; proposing a gear knocking evaluation index based on the moment of inertia in order to quantitatively evaluate the gear knocking intensity; using an orthogonal test method to study the factors affecting the gear knocking of the engine balance shaft system, and obtaining important parameters that have a significant impact on the gear knocking through range analysis; based on the selected important parameters, using a response surface method to optimize the gear knocking noise of the system. The method described in the present invention can analyze and optimize the gear knocking of an engine balance shaft system with scissor teeth, and provide a clear direction for reducing the gear knocking noise of the engine balance shaft system.

The utility model belongs to the technical field of diesel engine related equipment, and relates to a diesel engine balancer installing and positioning device which comprises a bottom plate, an installing groove is formed in the upper surface of the bottom plate, and a balancer is placed in the installing groove. Threaded grooves communicated with the mounting groove are formed in the end faces, facing the mounting groove, of the two ends of the bottom plate and are in threaded connection with adjusting bolts, the heads of the adjusting bolts are located on the outer side of the bottom plate, the ends of the adjusting bolts are located in the mounting groove, and four symmetrically-formed positioning holes are formed in the bottom plate; the positioning hole is used for being aligned with a mounting part of the diesel generator, and a clamping mechanism matched with the mounting groove is arranged on the bottom plate; rapid and accurate positioning can be achieved through the positioning plate and the positioning holes, the adjusting bolt and the clamping mechanism can ensure that the balancer is firmly installed and the position is accurate, the installation efficiency and quality are improved, and stable operation of a diesel generator is guaranteed.

The invention discloses an automobile engine balance shaft curvature detection tool, and relates to the technical field of balance shaft curvature detection, and the tool comprises a supporting assembly which is used for supporting automobile engine balance shaft curvature detection parts; the fixing assembly is located at the top of the supporting assembly; and the detection assembly is located at the middle position of the fixing assembly. According to the device, a motor drives one set of double-screw rods to rotate, meanwhile, a gear on one side rotates, through a chain and the gear, the remaining double-screw rods are made to rotate, a movable frame is moved to be adjusted, meanwhile, a rotary knob drives a rotating ring to rotate, a limiting frame is driven to move through a limiting column, and multiple sets of clamping frames are made to rotate inwards; the detection device is adjusted to a proper position, the asynchronous motor drives the balance shaft to move, detection is carried out through the detection device, data display is carried out through the control panel, the device can meet the requirements of balance shafts with different diameters, meanwhile, manual operation is saved, and the bending condition of the balance shaft can be comprehensively known.

The invention provides a balance mechanism and an engine, the balance mechanism comprises a balance shaft, the axial direction of the balance shaft is parallel to the axial direction of a crankshaft of a horizontally opposed two-cylinder engine; the axial direction of the crankshaft is parallel to or the same as the Y-axis direction; the two cylinders are located on the two sides of the crankshaft in the X-axis direction respectively and distributed in the Y-axis direction at intervals. The balance shaft is used for being connected with the crankshaft through the preset gear assembly, so that when the crankshaft rotates, the balance shaft is driven to rotate in the direction opposite to the rotating direction of the crankshaft at the same rotating speed; the balance assembly comprises a bevel gear assembly and a balance part, and the bevel gear assembly is connected with the balance shaft and the balance part, so that the rotating axis of the balance part is parallel to or the same as the Z-axis direction; the two balance assemblies are distributed in the axial direction of the balance shaft. The two balance parts are oppositely arranged in the X-axis direction, and the rotation directions of the two balance parts are opposite, so that the two balance parts generate force in the X-axis direction to balance the reciprocating inertia force of the two cylinders correspondingly.

The utility model discloses a forging die for a balance shaft of an engine, which comprises a lower die holder comprising a lower die block and a jacking block, the top surface of the lower die block is provided with a broken cavity, and the top surface of the jacking block is provided with a supporting through groove; an upper cavity is formed in the bottom surface of the upper die base; and the driving assembly is used for driving the upper mold base to move in the vertical direction, driving the lower mold base to move in the horizontal direction perpendicular to the length direction of the supporting through groove and driving the jacking block to move between the jacking position and the forming position so as to drive the upper mold base and the lower mold base to be switched among the mold closing state, the mold matching state and the mold splitting state. According to the forging die for the engine balance shaft, the relative positions of the upper die base and the lower die base are adjusted through the driving assembly, meanwhile, the positions of the lower die block and the jacking block in the lower die base can be adjusted, the contact area with a blank is increased through the supporting through grooves, and therefore the blank can be stably supported after forging is completed, collision of the blank is reduced, and the forging efficiency is improved. The later processing quality is ensured.

The invention relates to the technical field of balance shaft gears of motorcycle engines, in particular to a buffering noise reduction type balance shaft gear of a motorcycle engine, which comprises a balance shaft, a driven gear assembly, a driving gear and a crankshaft assembly, the balance shaft and driven gear assembly is formed by assembling a balance shaft driven gear assembly, a balance shaft assembly, a balance shaft left balancing weight, a third bearing, a fourth bearing, a woodruff key, a balance shaft right balancing weight, a gasket and a nut. The driving gear and crankshaft assembly is formed by assembling a driving gear, a crankshaft assembly, a first bearing, a second bearing and a connecting rod. When in use, the cylindrical damping rubber block is arranged between the balance gear center sleeve piece and the balance shaft driven gear, so that the balance shaft driven gear can play a role in damping and buffering under the condition that the balance shaft driven gear is subjected to impact force during speed change (acceleration or deceleration) after rotation.

The utility model provides a motorcycle engine, and belongs to the technical field of motorcycles. The clutch electric actuator solves the problem of how to improve the balance of an engine while ensuring that the clutch electric actuator does not additionally expand the occupied space of the engine. The motorcycle engine comprises a machine case, a front cylinder body, a rear cylinder body, a clutch pull rod and an air filter, a clutch electric actuator used for driving the clutch pull rod to move is fixedly arranged outside the machine case, and an inwards-concave installation space is formed between the air filter and the top face of the machine case. The clutch electric actuator is positioned in the mounting space and is arranged in parallel with the rear cylinder body in the left-right direction; the clutch electric actuator comprises a motor and a transmission case, the motor is arranged in the front-back direction, the rear end of the motor is connected with the transmission case, and the front end of the motor extends to the position of the front cylinder body. By means of the design, the occupied space of the engine cannot be additionally enlarged, the compactness of the overall structure of the engine is guaranteed, and the balance of the engine can be improved.

The utility model provides an engine balance shaft dismounting puller tool, which relates to the field of engine maintenance auxiliary tools, and comprises a sleeve and a stress plate, the top of the sleeve is provided with a semicircular opening, the stress plate is arranged at the top of the sleeve, the stress plate is provided with a U-shaped opening at one side of the semicircular opening, and the U-shaped opening is arranged at the other side of the semicircular opening. A pull ring is arranged at the bottom of the sleeve, the inner diameter of the stress face of the bottom of the stress plate is larger than the outer diameter of a shaft body of the balance shaft and smaller than the outer diameter of the gear, and the inner diameter of the sleeve is larger than the outer diameter of the gear. When the puller tool for disassembling the balance shaft of the engine is used, a user only needs to insert the U-shaped opening in the stress plate into a gap between a balance shaft gear and an engine shell, then the balance shaft can be pulled out of the engine under repeated pulling of a puller, and the sleeving and pulling modes are very convenient.

The utility model discloses an engine balance shaft assembly which comprises a balance shaft, a balance block assembly, a first bearing assembly, a second bearing assembly and a driving gear, the balance block assembly is arranged on the surface of a balance shaft body, and the balance block assembly and the balance shaft are of an integrated structure. The first bearing assembly and the second bearing assembly are installed on the two sides of the balance shaft in a pressed mode respectively, the driving gear is installed on the balance shaft in a pressed mode and located on the outer side of the second bearing assembly, and the balance block and the balance shaft are cast into a whole, so that assembling parts are reduced; the two bearings and the driving gear are assembled on the balance shaft in a press-fitting manner, so that parts for mounting bolts are reduced, the cost is greatly reduced, and the assembly scheme is simple and easy to operate.

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.

A balancing system and method for an engine of an aircraft is disclosed. A balancing system (100) for an engine (102) of an aircraft (104) includes a housing (110) that holds a magnetorheological fluid (112) containing magnetic particles (116) within a carrier fluid (114). An electromagnet is coupled to the housing (110). The electromagnet is associated with a fan blade (106) of the engine (102). A balancing control unit (122) communicates with the electromagnet and a sensor (108) of the fan blade (106).

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 marine closed steering engine main control valve group. The valve group comprises a valve block, and a special steering engine balance valve, an overflow valve, a one-way valve, a safety valve and a plate type ball valve which are arranged on the valve block, the balance valve, the overflow valve, the one-way valve, the safety valve and the plate type ball valve special for the steering engine are communicated with one another through hole channels in the valve block, the valve block further comprises a plurality of oil ports, the closed hydraulic system is connected with the valve block through the oil ports, and the valve set integrates the control function of the hydraulic steering engine and has the advantages of being high in integration degree, simple in structure, stable in action, high in reliability and the like. And stable operation of the steering engine in a marine environment is ensured.

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 invention discloses a four-cylinder engine balance shaft system, and relates to the technical field of engine damping, the four-cylinder engine balance shaft system comprises a balance shaft main body and a four-cylinder driving device, the four-cylinder driving device is fixedly connected with a first fluted disc, the surface of the balance shaft main body is fixedly connected with a second fluted disc, and the first fluted disc is engaged with the second fluted disc; the inner wall of the balance shaft main body is fixedly connected with an inner shaft, a shaft arm of the inner shaft is fixedly connected with an eccentric shell, a balancing weight is arranged in the eccentric shell, the shaft arm of the inner shaft is connected with two auxiliary blocks in a sliding mode, the balance shaft further comprises an adjusting component, and the adjusting component is arranged on the eccentric shell so as to control the distance between the balancing weight and the inner shaft. The damping device further comprises a switching component for controlling the displacement speed of the balancing weight to change when the distance between the balancing weight and the inner shaft is changed, the damping device further comprises an auxiliary component, and through mutual cooperation of the structures, the damping device has the effects of facilitating maintenance of maintainers and timely guaranteeing a good damping function.

The utility model relates to the technical field of engine balance shafts, in particular to a high-strength engine balance shaft structure which comprises a shaft rod, a transmission gear is fixedly connected to the middle of the shaft rod in a sleeved mode, an eccentric block is fixedly connected to one end of the shaft rod in a sleeved mode, and a connecting sleeve is fixedly connected to the side, located on the transmission gear, of the outer side wall of the shaft rod in a sleeved mode. And one end of the connecting sleeve is fixedly connected with a pressurizing wheel. According to the utility model, through the arrangement of the pressurizing wheel and the outer shaft sleeve, when the shaft rod rotates, the shaft rod and the transmission gear drive lubricating oil in the cavity to rotate in the same direction, the shaft rod rotates to drive the pressurizing wheel to rotate, and through the arrangement of the blades on the pressurizing wheel, the lubricating oil in the liquid accumulation ring is pushed to one side where a rotor bearing is located when the blades revolve; meanwhile, the lubricating oil is driven to rotate, and the pressure of the lubricating oil on one side of the rotor bearing is increased, so that the lubricating oil enters the rotor bearing conveniently, and the rotor bearing is well lubricated.

The present invention belongs to the technical field of power monitoring for airborne electronic equipment, and provides a dynamic balancing method and system for an airborne turboprop engine. Aiming at the problems existing in the traditional method, such as being only able to conduct ground tests, unable to make the engine reach the optimal rotational speed and aerodynamic influence during engine operation, and unable to give the predicted result of the engine vibration after balancing according to the vibration before engine trimming and the trimming scheme, an airborne dynamic balancing scheme is proposed. It can realize the detection of engine vibration in the air and the recording of vibration data, complete the calculation and trimming work on the ground, ensure that the vibration parameters are in a long-term and stable state of the engine, minimize the mechanical fatigue and damage caused by engine vibration to the greatest extent, and at the same time, be able to evaluate the vibration after engine balancing according to the engine vibration data and the actual trimming scheme, reducing the number of engine test runs.

The invention discloses a methanol engine balance shaft installation detection method and a detection tool thereof, and belongs to the technical field of engine assembly. The method comprises the following steps: processing a positioning pin hole in an engine cylinder body, and processing a positioning hole for measurement in a balance shaft; grading the distance from the bottom surface of the cylinder body to the main shaft hole of the cylinder body, the distance from the axis of the balance shaft to the mounting surface and the thickness of a gasket, and selecting the cylinder body, the balance shaft and the gasket for assembly; measuring the distance between the crankshaft axis and the balance shaft axis by using a detection tool; the operation test is carried out on an engine assembly test bench, the vibration performance of an engine is monitored through a vibration sensor, and a second-order vibration component corresponding to the balance shaft is separated and analyzed. Through a three-dimensional space positioning reference system formed by the cylinder body positioning pin hole and the positioning hole for measuring the balance shaft, the coaxiality error of the axis of the balance shaft and the axis of the crankshaft is reduced, the second-order vibration suppression efficiency is improved, and abnormal vibration excitation caused by axis deviation is remarkably improved.

The present invention relates to an aircraft balance parameter adjustment test bench and its parameter adjustment method, comprising an upper turbojet engine mounting platform, a central telescopic support and a spherical node, and a bottom hemispherical support. The upper turbojet engine mounting platform is elastically connected to the central telescopic support and the spherical node via a connecting spring, and is slidably connected to a support slide groove via a hydraulic telescopic rod. The central telescopic support and the spherical node are slidably connected to the bottom hemispherical support via a disk limiter and a hollow cylindrical force measurement limiter. A BP neural network model is used to adjust the test bench's angle control PID parameters and length control PID parameters in real time, changing the lengths and angles of the four hydraulic telescopic rods to achieve turbojet engine balance. Furthermore, the total lift and thrust data of each turbojet engine are integrated to optimize the turbojet engine control PID parameters, thereby meeting the requirements of turbojet engine aircraft testing and application. This simplifies operation, improves efficiency, and reduces costs while ensuring personnel and equipment safety.

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 engine balance shaft gear set with buffering function of the present invention comprises a driving gear, a driven gear and a buffer gear, wherein the buffer gear is made of spring steel, and the number of teeth and module of the buffer gear and the driven gear are the same, and the buffer gear comprises a circular mounting portion, an elastic arm and a buffer gear body, and the center of the mounting circular hole in the middle of the circular mounting portion is offset from the center of the indexing circle of the buffer gear, and the buffer gear is mounted at one end of the balance shaft and rests on the surface of one end of the driven gear, and the teeth of the buffer gear and the teeth of the driven gear are mutually misaligned, and in the process of meshing of the driven gear and the driving gear, each tooth of the driving gear first contacts with the teeth of the buffer gear and then contacts with the teeth of the driven gear. The present invention can effectively eliminate the impact force during gear transmission, and finally eliminate the transmission noise of the balance shaft gear, and improve the reliability of the balance shaft gear pair.

The utility model relates to the technical field of balancing devices, and discloses a motorcycle engine balancing device which comprises an engine, the surfaces of four first dampers are all sleeved with first damping springs, the top ends of the four first damping springs are all fixedly connected to the bottom of a bottom plate, and the bottom ends of the four first damping springs are all fixedly connected to the top of a connecting plate. Four inserting grooves are formed in one side of the engine, first storage grooves are formed in the four inserting grooves, first air bags are installed in the four first storage grooves, sliding grooves are formed in the surfaces of the sides, close to the four inserting grooves, of the engine, and starting mechanisms used for starting the first air bags are arranged in the four sliding grooves. Due to the arrangement of the dampers, the comfort level of a rider can be improved, the connecting plate is connected with the engine through the first damper, and due to the characteristics of the dampers, when the engine is started, the first damper can start an effective buffering effect so as to improve the comfort level of the rider.

The utility model discloses an automobile engine balance block, which comprises a balance component, a balancing component and a balancing component, and is characterized in that the balance component comprises a balance block; the connecting part comprises a connecting rod and a connecting block; the adjusting part comprises a screw rod and a fixing ring; the mounting part comprises a supporting block and a bolt; the connecting rods are symmetrically arranged on the two sides of the balance blocks and connected with the connecting rods, and the tail ends of the connecting rods are rotationally connected into the connecting blocks, so that the problems that according to an existing balance block, an engine is installed between the balance blocks, when the engine is installed at the front end of an automobile, the engine cannot be connected with an engine bin of the automobile, and the service life of the engine is affected are solved. When the balance block is attached to the engine, the balance block is connected with the side wall of the engine bin, vibration of the engine can be conducted into the side wall of the engine bin through the balance block, vibration of the whole automobile can be increased, and when the balance block is attached to the engine, vibration of the engine can cause the attached or magnetically-attracted balance piece to be thrown out due to vibration. And the use efficiency of the balance block is reduced.

The invention discloses a motorcycle engine double-balance-shaft structure which comprises a box body, a crankshaft is rotatably connected in the box body, the crankshaft drives a balance shaft I to rotate through a main driving gear and a balance shaft I driven gear, a cylinder head is arranged above the box body, an air inlet cam shaft and an exhaust cam shaft are arranged in the cylinder head, and the air inlet cam shaft and the exhaust cam shaft are arranged in the box body. The crankshaft drives the air inlet cam shaft and the exhaust cam shaft to rotate through the chain and the timing chain wheel, the air inlet cam shaft drives the balance shaft II driven gear to rotate through the balance shaft II driving gear, and the balance shaft II driven gear is arranged on the balance shaft II. The invention belongs to the field of engine balance mechanisms, and particularly relates to a double-balance-shaft structure of a motorcycle engine. Double balance shafts are arranged in limited spaces of all parts of the engine, inertia force and torque generated by movement of the engine are balanced, and therefore vibration of the whole engine is reduced.

The utility model discloses an engine balance shaft positioning tool which comprises a bottom plate, a stable clamping mechanism, a pressing block quick-changing mechanism and a clamping auxiliary mechanism, and the stable clamping mechanism comprises a sliding rail, a sliding block, a driving motor, a driving rod, a driven rod and a pressure spring frame. The pressing block quick-changing mechanism comprises a longitudinal plate, a clamping pipe, a clamping rod, a gradient groove, a rotating disc, a clamping groove, a locking rod and a pressing block, the stable clamping mechanism ensures that the balance shaft body is stably clamped on the containing plate, vibration and looseness are reduced, the operation precision and reliability are improved, the pressing block quick-changing mechanism achieves quick mounting and dismounting of the pressing block, and the service life of the balance shaft body is prolonged. The operation process is simplified, the replacement efficiency is improved, the clamping auxiliary mechanism assists rotation of the rotary disc, the stretching-in process of the lock rod and the fixing process of the clamping rod are smoother, and the operation convenience is improved.

The present invention discloses a forming device for fast gear shaping of a balance shaft of a small power gasoline engine. Its rotating base drives the balance shaft of the gasoline engine to feed circumferentially. The adjusting handle can adjust the installation angle of the clamp and play a tightening role. The tightening screw is mainly used for axial fixation of the clamp body. The Z-axis steering limit rod is used for circumferential fixation of the balance shaft during the rotation feeding process. The gear shaping cutter head moves up and down quickly and rotates slowly under the control of the feed gearbox body. With the rotation of the balance shaft, the tooth groove, tooth profile and tooth shape are quickly formed. The chip blowing air pipe sprays high-pressure air to discharge the waste chips in real time. The present invention has a wide range of applications and a novel structure, and can simultaneously improve product quality and production efficiency.

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%.