1111 results about "Spiral bevel gear" patented technology

The invention discloses a feed crushing device capable of intermittently unloading. The feed crushing device comprises a housing, a charge hole, crushing shafts, a crushing motor, a discharge hole andsupporting legs, wherein a two-way lead screw is arranged inside the housing; the two ends of the two-way lead screw are separately equipped with slide blocks in a sleeving mode; the upper ends of the slide blocks are fixedly connected with baffle plates; the right end of the two-way lead screw is equipped with a left bevel gear and a right bevel gear in a sleeving mode; a half bevel gear sleevesthe upper shaft stretching end of a double-axis motor; the crushing shafts are arranged inside the housing; a plurality of crushing blades are distributed on the crushing shafts; the two ends of eachcrushing shaft are rotatably connected with the inner wall of the housing; and the outer side wall of the housing is fixedly connected with the crushing motor. The double-axis motor drives the baffleplates to intermittently open and close, so that feed is controlled to intermittently drop, and much feed is prevented from entering 01 within short time to bring relatively great burden, and therefore, the crushing effect is guaranteed. The crushing shafts are arranged, so that crushing efficiency is improved; and feed is screened while crushing is performed.

The invention discloses a bionic rigidity-changeable flexible knee joint of an exoskeleton robot. The bionic rigidity-changeable flexible knee joint includes an elastic sheet arranged on a knee jointbody, a brushless direct current motor arranged on a crus inner board and for providing power, and a knee joint rotation shaft, wherein one end of an inner side of the knee joint rotation shaft is fixed with a thigh connection rod; the elastic sheet includes an outer ring and an inner ring, and an S-shaped elastic member is connected between the outer ring and the inner ring; the outer ring is fixedly connected to the thigh connection rod; one end of the brushless direction current motor has a small spiral bevel gear; the small spiral bevel gear is engaged with a big spiral bevel gear sleevingthe knee joint rotation shaft; the big spiral bevel gear is clamped with the inner ring; a pawl module is arranged on the crus inner board; a cam rotation plate is fixed on an outer end of the knee joint rotation shaft; one end of a tension spring is fixed on the cam rotation plate through a steel wire rope, and the other end of the tension spring is fixed on a ratchet wheel rotation plate of thepawl module. The bionic rigidity-changeable flexible knee joint adopts flexible drive, can relieve an instant ground impact force while a foot contacts a ground, can protect a human knee joint from being damaged, and can make walking more comfortable.

The invention discloses a fine forging forming method of spiral bevel gears, comprising the steps of: preparing for a material bar satisfying technical design requirements; heating the material bar to 1150-1180 DEG C; upsetting and punching as well as ring-enlarging the material bar on a press; pre-forging and forming in a pre-forging die on a multistage hot die forging press to obtain a pre-forging blank with pre-forging teeth, wherein the curved tooth spiral angle beta of the pre-forging die is 8-12 degrees smaller than that of a finish forging die; arranging the pre-forging blank on the multistage hot die forging press, and finish-forging and forming in the finish forging die; after a spheroidizing annealing treatment, cleaning the surface by sand-blasting, and phosphating and saponifying the surface; and finishing tooth profiles at normal temperature in a hydraulic machine. The method provided by the invention adopts a gradually forming manner consisting of pre-forging first and finish forging at last, therefore, the radial flow of the blank is greatly reduced, the side pressure of the blank to the tooth profile die cavity is reduced, the tooth profiles of the curved teeth of the forging die are prevented from being damaged, the service life of the forging die is prolonged, the production efficiency is improved, and the production cost can be efficiently reduced.

The invention relates to a six-axle five-linkage screw taper gear turning machine, wherein two sides of the machine are arranged with posts, a beam is mounted at the top of the posts, the middle of the machine is disposed with a X-track engaged with a movable X-axle block, one side of the beam is arranged with a Y-track with a movable Y-axle block, the Y-axle block is arranged with a Z-track with a movable Z-axle block mounted with a tool box, the tool box rotates driven by a driver and is mounted with a C axle with blades, the X-axle block is mounted with a work-piece box arranged with A axle for rotating and mounting work-piece driven by the driver, the work-piece box via B axle is hinged on the X-axle block and rotates around B axle. The invention has simple structure, high stability and efficiency.

The invention provides a contra-rotating propeller plant of a 360-degree rotating ship. The core of the contra-rotating propeller plant is contra-rotating propeller technology for use when the speed of an inland river small ship propeller is lower. The contra-rotating propeller plate is innovated and developed according to the current ship situation in China. Tests and sailing practices of a plurality of ships in more than ten years show that the contra-rotating propeller plant can save 8 to 10 percent of energy, is safe in navigation and increases the sailing speed and propelling speed by about 10 percent. On basis of serial products, a contra-rotating propeller theoretical graph lacking in China before is made through innovation. The invention adopts a direct drive mode to improve the energy-saving index by 1 to 2 percent. The inside of the plant is provided a hydraulic clutch system, so the plant achieves reliable operation, reduces noises and expanses power range. A cellular type sealing cover support having a sealing piece and an elastic element allows an engine and the entire machine to be arranged in a cabin (together with a spiral bevel gear and environmentally-friendly lubricating oil used in the machine) solves the problems of noises and environment protection, absorbs propelling force and vibration, and exerts a cushion and protection effect on the entire machine. The product is light in weight, low in cost, small in dimension, novel in structure, convenient in installation and maintenance and suitable to be used various ships sailing in the inland river, and is a ship propelling unit which is higher in efficiency, energy-saving and environmentally-friendly.

The invention discloses a two-hole perforating device for a food packaging box side wall paper board. The two-hole perforating device comprises a pedestal, supporting plates, a top plate, a lifting plate, mounting blocks, a first adjusting shaft, first threaded parts, first swivel nuts, connecting pieces, perforating rods, a platform plate, a driven bevel gear, a driving bevel gear and a first motor. Sliding chutes are formed in the lower end of the lifting plate and are further located over the first threaded parts. Sliding blocks are installed on the outer walls of the upper ends of the first swivel nuts, and the top ends of the sliding blocks are arranged in the sliding chutes in a sliding mode. By means of the two-hole perforating device for the food packaging box side wall paper board, the distance between the two perforating rods can be adjusted through the first adjusting shaft, the distance between two holes perforated in the paper board can be adjusted conveniently, and perforating can be conducted as required; movement of the paper board in the perforating mode can be avoided through pressing blocks, and the phenomenon that the paper board is carried away by the perforating rods can also be avoided; and meanwhile, due to arrangement of a half bevel gear, ascending and descending of the lifting plate can be adjusted in a circulation mode without changing the rotating direction of a second motor, and the service life of the second motor is prolonged.

The invention discloses a spiral bevel gear cutting machine tool and a gear cutting method. The gear cutting machine tool comprises a cutting tool system, a workpiece system, a machine tool body and a numerical control system, wherein the cutting tool system comprises an XZ working table, an X-axis lead screw, a Z-axis lead screw, a short shaft, a tool base revolving drum, a tool base, No.1 milling cutters, a milling cutter shaft, No.2 milling cutters, a gear shaft and a correcting wedge. The rotating centre line of the tool base revolving drum and the rotating centre line of the short shaft are collinear; the right end surface of the tool base revolving drum is fixedly connected with an annular flange plate at the left end of the tool base by the correcting wedge; the right end of the tool base is provided with the milling cutter shaft; the rotating centre line of the milling cutter shaft and the rotating centre line of the short shaft are intersectant; and both ends of the milling cutter shaft are provided with the No.1 milling cutters, the No.2 milling cutters or grinding wheels. The left end surface of the tool base is provided with a drive motor; the drive motor is meshed with a bevel gear on the milling cutter shaft by the gear shaft; and the rotating centre line of the output shaft of the drive motor and the rotating centre line of the milling cutter shaft are vertically intersectant. The invention also provides a method for processing helical bevel gears by utilizing the machine tool.

The invention relates to a four-axis and four-linkage numerical control generating machine of arc bevel gear and belongs to the field of the gear generating machine technology. The invention comprises a machine body, a workpiece box and a cutting tool box. The machine body is fixedly provided with a straight guide rail of Z-axis and a straight guide rail of X-axis. The straight guide rail of X-axis drives a saddle to do the straight line motion via a servo motor. The saddle is provided with a workpiece box and rotates around a rotary shaft to do the rotary motion of B-axis for adjusting the required cone angle of gear root. The workpiece box is provided with a workpiece spindle which is driven by the servo motor to do the rotary motion of A-axis. The straight guide rail of Z-axis drives a vertical column to do the straight motion of Z-axis via the servo motor. The vertical column is fixedly provided with a straight guide rail of Y-axis which drives the cutting tool box to do the straight and reciprocating motion in the vertical direction of Y-axis via the servo motor. The main motor on the cutting tool box drives the cutting tool disk which is provided with the cutting tool to rotate for doing the rotary motion of C-axis of gear cutting. The four-axis and four-linkage numerical control generating machine of arc bevel gear has the advantages of simple structure, humanized layout, convenient loading and unloading of the workpiece, good dynamic rigidity and dynamic balancing, and small occupied area.

The invention discloses a method for profiling a spherical involute spiral bevel gear. The method is characterized by comprising the steps that S1, a mathematical model of a spherical involute spiralbevel gear pair is established; S2, a tooth surface equation of a concave surface and a convex surface of a pair of meshing gears is derived; S3, a tangent plane of the position, at the center point,of the tooth surface is established, and a plane coordinate system is established on the tangent plane; S4, a point on the tooth surface is projected to a the tangent plane, and the coordinate of theprojected point in the tangent plane coordinate system is obtained; S5, the coordinate of the projected point in the S4 is substitute to a shape correction equation to obtain the correction amount ofeach point on the tooth surface; S6, the point on the tooth surface in the S2 is shifted towards the interior of the gear teeth along the tooth surface normal vector at the point; S7, the point cloudobtained after shifting in S6 undergoes high order fitting to form a smooth surface; and S8, a shape correction three-dimensional model of the spiral bevel gear is established on the basis of the profiling tooth surface. The method has the beneficial effects that a very smooth profiling tooth surface can be obtained, full controllable shape correction is achieved, and the transmission quality of the gear pair is effectively guaranteed.

The invention discloses an all-drive type smart manipulator. The all-drive type smart manipulator comprises a chute type palm, four fingers and a thumb, wherein the thumb and the four fingers respectively sequentially comprise an upper metacarpophalangeal joint, a middle metacarpophalangeal joint, a lower metacarpophalangeal joint and a basic joint, the basic joints of the four fingers are respectively arranged in the chute type palm in parallel in the same direction by virtue of respective rectangular fixed blocks; the basic joint of the thumb is vertically arranged on the chute type palm by virtue of a round fixed block on a thumb mounting and adjusting structure, the thumb mounting and adjusting structure is arranged in a chute at the lower part of the chute type palm, and the mounting position and orientation of the thumb are manually adjusted and fixed; and the five fingers respectively form three driving curve degrees of freedom and one driving sway degree of freedom, so that twenty driving degrees of freedom are formed in total. The fingers are all driven by adopting a built-in stepping motor, a spiral bevel gear is adopted to realize rotation of the joints, and the kinematic accuracy is high. The orientation and mounting position of the thumb can be adjusted in the mechanical structure in the invention, thus the dexterity and grabbing stability of the manipulator are improved, and the grabbing space of the manipulator is increased.

The invention discloses a method for processing spiral bevel gears on a general six-axle numerically-controlled machine tool. The method includes connecting a standard facing cutter to a cutter spindle of the machine tool by a special cutter handle, fixing a gear workpiece to a C-axle turntable by a three-jaw chuck, and setting and starting electronic gear functions of the cutter spindle and a workipiece spindle to enable the facing cutter and the gear workpiece to do engaged unfolding motion to process gear faces. According to the method, modification to the machine tool is not needed, and only mounting of the cutter handle, and the facing cutter and a fixture which are acquired by processing of gears is needed to realize production of the spiral bevel gears in small or medium batch, so that processing cost is reduced, and good economic benefit is achieved.

The invention discloses a spiral bevel gear surface contact analysis method. The method includes: taking a large gear as an imaginary generating gear tool to generate a small gear datum tooth surface;according to small wheel processing parameters and a linear cutting edge starting position, determining a boundary between an operating tooth surface and a transition curved surface, working out minimum and maximum processing corners of the large gear in an operating tooth surface range, and further calculating coordinates of the small gear datum tooth surface and a small gear tooth surface on aninstantaneous contact line correspondingly to obtain a gap between the two tooth surfaces; taking a minimum gap point on the instantaneous contact line as a contact point to obtain an approximate contact trace line, wherein the contact point is an effective contact point when the gap is smaller than 0.00635mm; converting all contact point minimum gaps into angular units to obtain an approximate transmission error. According to different geometrical conditions, two conditions namely edge contact and normal contact are included. Results of the approximate method are quite close to those of traditional theoretical methods, and engineering requirements can be met.

The invention discloses a main decelerator for middle and small size helicopters. The upper end of a rotor shaft is the output end, and a shaft sleeve is arranged on the middle-upper part; a deep groove ball bearing is arranged on the upper part of the shaft sleeve, a secondary driven helical bevel gear is arranged on the middle part of the shaft sleeve, a jointed sun gear is arranged on the lower part of the shaft sleeve, three planetary gears are in mesh transmission with the sun gear respectively, and three planetary gears mesh with the gear ring respectively to form a planetary gear train; the gear ring is fixed on an annular base through a key, a horizontal transmission shaft is arranged on one side of the outer part of the base through supporting seats and a supporting board, a secondary driving helical bevel gear and a primary driven helical bevel gear are respectively arranged on two ends of the transmission shaft through splines, and the primary driven helical bevel gear is an input gear. The main decelerator disclosed by the invention adopts the technologies of nested installation for the sun gear shaft with the rotor shaft and integrated design for the planetary gear train bearing, the installation space is saved, the number of key parts is reduced, the system reliability is improved, the whole structure has the advantages of high carrying capacity, compact structure and easy maintenance, and the whole power transmission is U-shaped.

The invention discloses a precise forging method for an automobile driven spiral bevel gear, which comprises: molding a precision forging by subjecting a cylindrical rod blank heated to a forging temperature to upsetting, punching, broaching, ring rolling, swing rolling molding, correcting and other processes, finely finishing the toothed part of the molded forging and completing a production process, wherein the forging temperature of the cylindrical rod blank is 1,120 to 1,200 DEG C, and a preheating temperature of the swing rolling die is 250 to 360 DEG C. The method has the advantages that: the production equipment requires a smaller investment and is more economic; less blank metal is used and raw material is saved; die machines more easily, the service life of the die is prolonged, and expensive die material is saved; and the gear precision of the forging blank is guaranteed, the machining of the toothed part is accelerated, and the mechanical performance, especially strength, of the gear is enhanced.

The invention provides a heat treatment method of a spiral bevel gear of a cargo truck on double-row rare earth carburization equipment, and relates to a carburization heat treatment technological process of the spiral bevel gear of the cargo truck. The invention solves the problems that energy consumption of carburization heat treatment is high, production cost of a product is high and carburization quenching and gear thermal distortion still exist in a carburization process. The method provided by the invention comprises the following steps of: taking a preheating zone as a strong leakage region 1 and taking a carburizing region as a strong leakage region 2, namely taking a region II and a region III as a carburizing speed main control region and taking a region IV and a region V as a metallographic structure main control region, carrying out temperature control in the regions I, II, III, IV and V, carrying out carbon potential control in the regions II, III, IV and V, and inputtingcarburizing medium propane gas, rare earth methanol penetrating agent, nitrogen, methanol and air into a furnace, thus the heat treatment method is realized. The metallographic structure and surface hardness of the spiral bevel gear subjected to the heat treatment method provided by the invention are all optimized, and heat treatment quality of the spiral bevel gear is improved; meanwhile, capacity is improved by 23%, heat treatment production cost is reduced by 18.9%, and pollution of exhaust emission to the environment is reduced.

A bevel gear is generated using an annular milling cutter having a blade material made of a high-speed tool steel mounted to a main body, the blade material being coated with at least one layer of a film of a composition substantially comprising (Ti(1-x)Alx)(NyC(1-y)) (where, 0.2<=x<=0.85, 0.2<=y<=1.0), and dry cutting is performed at a cutting speed in the range from 20 to 400m / min without using a cutting oil. With this method, teeth can be generated at a greatly improved cutting speed without using any expensive tool such as cemented carbide, thereby realizing efficient production of a bevel gear at a reduced cost.

The present invention relates to one kind of intelligent measuring and regulating instrument for assembled milling cutter machining spiral bevel gear. Technologically, the intelligent measuring and regulating instrument includes one height measuring head with one digital dial gauge mounted in the end of the horizontal oscillation arm, and one radial measuring head with one digital dial gauge coaxially with the height measuring head. The measured data is stored, analyzed and processed in a computer and the processed result is shown in a display screen. The present invention can raise the milling cutter measuring and regulating precision and efficiency, and has simple structure and low manufacture cost.

The invention relates to a gear cutting method for manufacture of spiral bevel gear with spherical involute tooth profile shrinkage tooth which is the gear cutting method that an arc-shaped cutting edge skiving cutterhead with turning radius of R on an end surface (T) is adopted for turning of spherical involute tooth profile and the shrinkage tooth is adopted to manufacture the tooth surface of the spiral bevel gear. When in cutting, a tooth casting is tangental to spherical large round plane (Q) represented by machine tool shaking station turning plane and maintains pure rolling according to base cone, rotating speed of every shaft of the machine tool is set up according to following speed ratio relations: when rotating speed of the shaking station is omega, rotating speed of the tooth casting is (1) type, wherein, ZQ is hypothetical tooth number of the shaking station, rotating speed of a cutterheadshaft is (2) type, and omega is opposite to the direction of omega 0; skiving cutterhead knife edge S is tangental to processed tooth surface and tooth surface fine turning process without generation of undercut is finished in the state of large bevel turning. Engaging quality of the cutting gear manufactured with the method is improved, with transient speed ratio constancy and insensitivity of influence of contacting area by transmission included angle alteration, moreover, the gear processed with the method can be exchanged and the invention simplifies the design of the gear and machine tool.

The invention relates to the technical field of gear measurement, in particular to a structure of a multi-freedom degree laser displacement sensor system and a spiral bevel gear measurement method of a device based on the measurement system. The system consists of a laser displacement sensor and a support with the spatial orthogonal axial rotational freedom degree. During measurement of the spiral bevel gear, the rotational pose of the sensor support can be adjusted to allow the laser displacement sensor to keep the same spatial inclined pose with the to-be-measured arc-shaped tooth line as far as possible, thereby ensuring that light spot light sources on the to-be-measured gear tooth face irradiated by laser emitted by the sensor can be reflected on a receiving window of the sensor. Thus, in a measurement process of the gear, acquired data is complete and effective. The system and the method are characterized by simple measurement equipment structure, easy operation and high flexibility.

A power turret integrated with turn-milling belongs to the turret for a numerically-controlled machine tool, comprising a box body. The box body is internally provided with an electric motor which comprises an electric motor stator and an electric motor rotor, the electric motor stator is fixedly arranged on the box body, and a hollow spline shaft is fixedly connected at the middle of the electric motor rotor; a clutch is connected at one end of the hollow spline shaft in a transmission manner, the clutch comprises a movable rotating gear of the clutch and a fixed rotating gear of the clutch, the movable rotating gear of the clutch is connected with the hollow spline shaft and can axially move along the hollow spline shaft, and the fixed rotating gear of the clutch is connected with a first transmission shaft in a transmission manner; the first transmission shaft penetrates through the hollow spline shaft, and a first spiral bevel gear is connected at the other end of the first transmission shaft in a transmission manner; and a cutter head is oppositely and rotatably connected at one end of the box body, the cutter head is provided with a rotary cutter, a second transmission shaft is connected on one side of the rotary cutter in a transmission manner, a second spiral bevel gear is connected at the other end of a second transmission shaft in a transmission manner, and the second spiral bevel gear is meshed with the first spiral bevel gear.

The invention relates to a numerical control curve-tooth bevel gear grinder, which comprises a lathe bed, and is characterized by also comprising an upright post, a grinding wheel main shaft box, a workpiece main shaft box, an electric turntable, a grinding wheel correcting mechanism and a numerical control system. The lathe bed in the horizontal direction is provided with linear guide rails vertical to each other, the upright post and a bed saddle are arranged on the linear guide rails respectively, and an upright post automatic moving mechanism is arranged between the bottom of the upright post and the lathe bed; one lateral surface of the upright post is provided with the linear guide rail and the grinding wheel main shaft box, and the same side of the upright posts close to the top is provided with a moving mechanism for driving the grinding wheel main shaft box to move; and the bed saddle is provided with the electric turntable which is provided with the workpiece main shaft box on which the grinding wheel correcting mechanism is arranged. The numerical control curve-tooth bevel gear grinder has the advantages that the grinder simplifies the prior mechanical transmission, shortens adjusting time of a machine tool, has compact and reasonable structure, accurate processing with high accuracy, high automation degree to remarkably improve processing efficiency, and has low manufacturing cost to relieve economic burden of enterprises.

The invention discloses a filter speed reducer, which comprises an eccentric shaft, a split spine half-axle dual gear, a fixed gear, an output gear and a rubber alloy layer. The split spine half-axle dual gear, the fixed gear and the output gear are helical bevel gears which are organically meshed to form a backlash-free precise transmission pair and can adaptively compensate for abrasion of tooth surfaces; the rubber alloy layer adhered on the split spine half-axle dual gear can ensure that a transmission component filters fluctuation caused by the conversion of a low speed and high torque into a high speed and low torque of a motor, processing and mounting errors and the like through a controllable elastic distortion quantity in a designed transmission accuracy and bearing capacity range, effectively prevents generation of nonlinear coupled vibration of a transmission system caused by influences of extreme working conditions and special environments, and solves the problems of generation of jam even inflexible lock and the like of the transmission component. Thus, the filter speed reducer has the advantages of high precision, high reliability, long service life, high torque, low energy consumption, small volume and the like, and can be widely applied to equipments in engineering fields, such as robots, space flights, ships and vehicles.

A method of determining an optimized face cone element for spiral bevel and hypoid gears. The form of the root fillet of one member of a gear pair is determined and that from is transferred to the tip of the other member of the gear pair. With the inventive method, tooth root-tip clearance is optimized and the contact ratio is maximized while avoiding root-tip interference between mating gear members.

The invention relates to a thermal treatment deformation control method for a duplicate spiral bevel gear. By carburizing on a component for twice, a problem that carburizing layers of different parts of the component are different in depth is solved, and the conventional quenching mode is changed; allowance is reserved during machining, and the machining allowance is changed into deformation compensation dosage under the action of quenching pressure of a mould on the top of the bevel gear, so that the carburizing layer precision of the duplicate spiral bevel gear is controlled within 0.1mm, and the + / -10' error control on taper angle at two sides is realized. The thermal treatment deformation control method disclosed by the invention is reasonable in process technology, remarkable in deformation control effect, and capable of providing a novel thought for deformation control of similar products.

The invention provides a spiral bevel gear long-life drive fatigue reliability design method based on grinding and heat treatment. The method includes the steps that 1, influence laws of grinding process parameters on gear surface roughness and residual stress are studied; 2, influence laws of heat treatment process parameters on gear surface hardness and depth of carburizing are studied; 3, influence laws of the gear surface roughness, the residual stress, the gear surface hardness and the depth of carburizing on all parameters in a spiral bevel gear fatigue contact and fatigue bending strength and stress calculation formula are studied; 4, influence laws of the grinding and treatment process parameters on all the parameters in the spiral bevel gear fatigue contact and fatigue bending strength and stress calculation formula are obtained; 5, distribution laws of the heat grinding and treatment process parameters are studied; 6, a reliability calculation program under Monte Carlo method spiral bevel gear multiple failure modes is compiled, and the grinding and treatment process parameters serve as input for spiral bevel gear reliability calculation. The spiral bevel gear long-life drive fatigue reliability design method has important significance in practical application of gears.

The invention relates to a main reducer for a coaxial dual-rotor high-speed helicopter with a tension paddle. The main reducer comprises a 2K-H helical tooth planetary gear train (consisting of a sun wheel input shaft, planet wheels and a planet carrier) and a spiral bevel gear differential gear train (consisting of an input gear, an upper rotor gear shaft, a lower rotor gear shaft and a tension paddle output gear shaft). The sun wheel input shaft transmits input torque through the 2K-H helical tooth planetary gear train and drives the input gear to perform transmission to realize coaxial reversal output torque of the upper rotor gear shaft and the lower rotor gear shaft in the spiral bevel gear differential gear train and output torque of the tension paddle output gear shaft. Such characteristics of the spiral bevel gear as high transmission efficiency, low vibration noise and high bearing capacity are combined with such advantages of the planetary gear train as compact structure and large transmission ratio. The front tension paddle is combined with coaxial dual rotor wings through power output, the requirements of the high-speed helicopter on high-speed flight and powerful power improvement can be met, and the invention has a certain guiding significance for design of the main reducer of the helicopter.

The invention relates to a spiral bevel gear tooth surface loading performance multi-objective optimization method. The method is characterized by comprising the following steps that firstly, a mathematical model of a spiral bevel gear tooth surface loading performance multi-objective optimization problem is established, and test design sample points are obtained; secondly, a tooth surface loadingcontact analysis method considering tooth root bending stress is established, tooth surface loading contact analysis is conducted on the test design sample points, target functions corresponding to the test design sample points and response values of the target functions are obtained, and then an initial sample point set including the test design sample points and the corresponding response values is obtained; thirdly, a Kriging proxy model is fitted on the basis of the initial sample point set, the mathematical model of the spiral bevel gear tooth surface loading performance multi-objectiveoptimization problem is solved, and the optimal solution set of the spiral bevel gear tooth surface loading performance multi-objective optimization problem is obtained. The method is high in calculation efficiency, high in calculation accuracy and capable of being widely applied to spiral bevel gear tooth surface loading performance multi-objective optimization.

The invention discloses a tooth cutting method for a bevel gear with spherical involute toothed archimedes spiral teeth and a machine tool thereof. The method overcomes the disadvantages that the current tooth cutting method forms principle errors, has complex revision calculation, trial cutting and adjustment of a machine tool, and the like. The tooth cutting method adopts a machine tool with double stations and a single cutter head, which can continuously tooth dividing. When teeth are cut, the I station at one side of the cutter head completes the rough cutting of tooth sockets and the finishing cutting of the concave tooth surfaces of teeth; then the II station at the other side of the cutter head completes the finishing cutting of the convex tooth surfaces of the teeth, each cutter tooth straight edge on a cutting tooth cutter head envelopes and cuts out the side surfaces of the teeth, the circular arc edge of tooth top cuts out the tooth root, and the rough cutting concave edge cuts off the margins of the tooth sockets; and when the teeth are cut, a cutter head shaft and the tooth blank shaft are in a spatial cross position, the rotating end surface of the cutter head is perpendicular to the tangent plane of the gear blank base cone, the cutter head, the gear blank and the big circular plane of an imaginary spherical surface rotate in an uniform speed, the cutter head is in the rotary feed when cutting the teeth, and the continuous hobbling base cone toothed portion is the spiral bevel gear of Archimedes. The invention provides a machine tool, a cutter head and a cutter tooth for realizing the tooth cutting method.

A 6-axle 5-linkage machine-tool for manufacturing spiral bevel gear is composed of machine body, vertical post, linear X-tracks on said machine body, slide X-carrier sliding on said X-tracks, linear Y-tracks on said slide X-carrier, workpiece box sliding on said Y-tracks, rotary axle A on said workpiece box, linear Z-tracks on the lateral surface of said vertical post, Slide Z-carrier sliding on said Z-tracks, drive unit, tool box on said Z-carrier and revolving around axle B and its driver, and rotary axle C installed to said tool box.

The invention discloses a method for precisely carrying out hot forging on a driven spiral bevel gear of an automobile rear axle, belonging to the technical field of plastic formation. The method comprises the operation steps of: firstly, heating a cylindrical blank with a pre-calculated size to a temperature of 1100-1200 DEG C; then, upsetting the blank to be cake-shaped; thirdly, placing an upset piece into a pre-forging die for pre-forging; then, placing a pre-forged piece into a punching die for punching a part of skin on an inner hole; and finally, placing a punched piece into a finishing die for finishing. With the adoption of the method disclosed by the invention, the driven spiral bevel gear is heated just for one time; the production efficiency is high; a great amount of materials are saved; and the service life of dies is long, so that the method is applicable to large-scale production. The precisely-forged spiral bevel gear only needs little follow-up cutting machining. The organization property and the mechanical property of the precisely-forged spiral bevel gear are greatly improved.