60 results about "Involute gear" patented technology

The present invention discloses a robotic arm of an industrial robot, belonging to the field of mechanical transmission. The arm includes: a four-axis housing, a wrist housing, and a forearm housing composed of a rear-end forearm housing, an intermediate forearm housing, and a front-end forearm housing. A four-axis reduction mechanism is arranged inside the four-axis housing, a five-axis reduction mechanism, a six-axis first-stage reduction mechanism, and a six-axis second-stage reduction mechanism are arranged inside the forearm housing, and a six-axis third-stage reduction mechanism is arranged inside the wrist housing; the four-axis, five-axis, and six-axis reduction mechanisms all adopt a combined transmission mode of hypoid gears and involute gears, having the advantages of stable operation and strong impact resistance. While ensuring a reasonable layout, the entire arm system takes into account the overall lightweight design. In addition, the connection methods of the external interfaces with each joint and the motor interfaces adopt a flexible design, and the interfaces can be flexibly converted, with stronger applicability.

The invention belongs to the technical field of gear machining, and discloses a gear milling blade and a disc-shaped milling cutter. The gear milling blade is installed on the end faces of the two sides of a milling cutter disc and comprises a top edge, a side edge and an auxiliary edge, and the top edge is arranged between the side edge and the auxiliary edge. The outer contour line of the top edge protrudes towards the workpiece to be machined, the outer contour line of the top edge comprises a top edge arc line and a Bezier curve, one end of the top edge arc line is connected with the outer contour line of the side edge, and the other end of the top edge arc line is an end point E; one end of the Bezier curve is connected with the end point E and is tangent to the end point E, and the other end of the Bezier curve is connected with the outer contour line of the auxiliary blade. The gear milling blade has the outline shape of a Bezier curve, and can effectively improve curvature distribution on a tooth root transition curve, increase the curvature radius of the tooth root transition curve and reduce tooth root stress when cutting a tooth groove, so that the tooth root strength of an involute gear is improved.

The invention belongs to the technical field of gear machining, and discloses a gear milling blade and a disc-shaped milling cutter. The tooth milling blade comprises a side edge, a top edge and an auxiliary edge, wherein the top edge is arranged between the side edge and the auxiliary edge; the outer contour line of the top edge protrudes towards the workpiece to be machined, the outer contour line of the top edge comprises a top edge arc line and an oval arc line, one end of the top edge arc line is connected with the outer contour line of the side edge, and the other end of the top edge arc line is an end point E; one end of the elliptic arc line is connected with the end point E and is tangent to the end point E, and the other end of the elliptic arc line is connected with the outer contour line of the auxiliary blade. The tooth milling blade is provided with an elliptical profile curve, so that the curvature distribution on a tooth root transition curve can be effectively improved, the curvature radius of the tooth root transition curve is increased and the tooth root stress is reduced when a tooth groove is cut, and thus the tooth root strength of an involute gear is improved; and meanwhile, the elliptic arc line and the top edge arc line are connected and tangent at the end point E, so that the outer contour line of the top edge is ensured to be smooth.

A seat adjustment mechanism includes a first component and a second component movable relative to the first component. A drive mechanism is drivingly connected to the second component to move the second component relative to the first component. The drive mechanism includes a drive motor drivingly connected to a first gear element having conical involute gearing. A second gear element includes conical involute gearing that meshes with the conical involute gearing of the first gear element. The conical involute gearing has a frustoconical tooth thickness, a frustoconical tooth root, and a frustoconical outer diameter.

The present invention aims to provide a friction element segmentation device with a spring disposed on the tooth portion, comprising a shaft, a cylinder, a piston, an end plate, a plate holder, an involute gear ring, and a flange. The cylinder, piston, and end plate are mounted on the exterior of the shaft, the end plate is fixed to the plate holder, a spring is mounted between the plate holder and the piston, a perforated plate and a perforated friction plate are mounted between the end plate and the piston, the perforated plate and the perforated friction plate are spaced apart to form a series of friction pairs, a spiral segmentation spring with a handle is mounted between the perforated plate and the perforated friction plate, and an end plugging plate and a flange are mounted at each end of the involute gear ring. Without increasing the volume and weight of the friction clutch and without changing the overall structure of the existing clutch, the device achieves rapid axial separation and precise positioning of the friction elements after the clutch is disengaged, reduces friction between the friction elements, reduces drag torque and lubricating oil heating, and improves the no-load transmission efficiency of the clutch. The device is particularly suitable for torque reduction modification of an existing clutch.

The invention relates to the technical field of hard tubular bus grounding tools, and particularly discloses an extra-high voltage hard tubular bus grounding device, which comprises a fixed base; the movable pressing head is hinged to the fixed base through a rotating shaft, a pressing face is formed on the inner side of the movable pressing head, an involute gear structure is formed on the outer side of the movable pressing head, and ratchets are arranged on an involute gear; the driving handle is connected to the pawl, and the pawl is meshed with the ratchets on the movable pressing head; the pressure sensing module is embedded into the pressing surface of the movable pressing head or the pressure-bearing surface of the fixed base and is used for directly detecting the clamping pressure on the cable and the tubular bus; and the feedback module is connected with the pressure sensing module and used for providing perceptible feedback of the real-time clamping pressure. Therefore, the defects of a conventional grounding wire are overcome, and the cable can be safely, conveniently and reliably mounted on the hard tubular bus, so that the blank in the prior art is filled by providing a temporary grounding point with a clear state, and a safety guarantee is provided for the maintenance work of core equipment of an extra-high voltage transformer substation.

The utility model provides an involute gear generating instrument, which belongs to the technical field of machinery and comprises a support plate, and a chute is arranged on the surface of one side of the support plate. And the driving assembly comprises a sheet metal part fixedly installed on the surface of the other side of the supporting plate, a motor is installed on the surface of one side of the sheet metal part in a matched mode, and the output end of the motor penetrates to the surface of one side of the inner wall of the sheet metal part. According to the utility model, through the cooperation of all parts in the bearing assembly, students can use the device to deeply study the gear processing principle and technical key points, and the students can use pencils to record the envelope lines of the cutting edge of a cutter at all positions on a drawing paper; through cooperation of all parts in the driving assembly, it can be effectively ensured that the moving distance of the rack every time is kept consistent, so that the effect that students can completely observe the machining process and the undercutting phenomenon of the gear is achieved, and meanwhile the situation that each student independently completes after-class homework can be supervised.

A parametric modeling method for modified helical gears, wherein the modified gear involute is obtained by rotating the standard gear involute around the center of a base circle by σ radians, and the homogeneous coordinate transformation method and the scanning and cutting operation of the three-dimensional CAD software are adopted. The modeling of the modified helical gear tooth surface utilizes the scanning and cutting operation of the three-dimensional CAD software, the scanning path is the tooth modification curve, and the scanning profile is the tooth profile modification curve, and the method includes the following steps: (1) calculating the tooth profile modification curve and the surface equation; (2) establishing a two-dimensional sketch of the tooth profile of the modified helical gear; (3) calculating the tooth modification curve and the surface equation; (4) performing the scanning and cutting operation along the tooth modification curve and creating a three-dimensional geometric model of the modified helical gear. The invention solves the problem of establishing models of modified helical gears of different modification types, and the modeling process is simple, the modeling difficulty is reduced, and the modeling accuracy is improved.

The application belongs to the technical field of gear machining, and discloses a gear milling blade and a disc-shaped milling cutter. The gear milling blade comprises a side blade, a top blade and a sub-blade, and the top blade is arranged between the side blade and the sub-blade. The outer contour line of the top blade is convex to a workpiece to be machined, and the outer contour line of the top blade comprises a top blade arc line and an elliptical arc line. One end of the top blade arc line is connected with the outer contour line of the side blade, and the other end of the top blade arc line is an end point E. One end of the elliptical arc line is connected with the end point E and is tangent to the end point E at the end point E, and the other end of the elliptical arc line is connected with the outer contour line of the sub-blade. The gear milling blade has an elliptical profile curve, which can effectively improve the curvature distribution on the dedendum transition curve, increase the curvature radius of the dedendum transition curve and reduce the dedendum stress when cutting the gear slot, so as to improve the dedendum strength of the involute gear. Meanwhile, since the elliptical arc line is connected with the top blade arc line at the end point E and is tangent to the top blade arc line at the end point E, the outer contour line of the top blade is smooth and smooth.

The invention provides a method for measuring and calculating the abrasion loss of an involute gear based on a self-reference datum. The method does not need to depend on an external reference, measurement errors caused by reference deviation are effectively reduced, an accurate and rapid calculation method is found, accurate calculation of different involute gear abrasion losses can be achieved by changing the basic parameters of the gear, and the calculation accuracy is improved. Similarly, the abrasion loss of corresponding involute parts, such as involute splines, can be accurately calculated. And a key technical support is provided for wear loss precision control and data reliability of the gear tooth surface in gear wear and gear contact fatigue tests and process and parameter design of the gear.

The application provides a measurement and calculation method based on self-reference reference involute gear wear amount. The method does not need to rely on external reference, effectively reduces the measurement error caused by reference deviation, and finds an accurate and fast calculation method. By changing the basic parameters of the gear, the accurate calculation of different involute gear wear amounts can be realized, and the wear amounts of corresponding involute parts, such as involute splines, can also be accurately calculated. The method provides key technical support for the precision control and data reliability of the gear tooth surface wear amount in the gear wear and gear contact fatigue test, and the process and parameter design of the gear.

The present application relates to a kind of gear machining process for one-way engagement.The present application includes S1, blanking: providing blank;The blank is annealed;Carry out shot blasting treatment;Phosphorus saponification surface treatment is carried out to facilitate surface lubrication;By the plastic deformation mode of extrusion material, form two connected cylinders of different sizes;Cold extrusion after the blank of shrinkage diameter is carried out cold extrusion flat processing;Preform outer circle spline extension initial step;Carry out recrystallization annealing treatment;Carry out shot blasting treatment;Phosphorus saponification surface treatment is carried out;One-time extrusion forming inner hole ratchet tooth, outer circle involute gear and involute straight spline;The workpiece after extrusion forming is turned;The workpiece after turning is treated by heat treatment carburizing quenching;The workpiece after carburizing quenching is treated by tempering;Carry out shot blasting treatment.The present application improves the single-tooth strength of inner hole ratchet tooth and outer circle involute gear, and can greatly improve production efficiency and reduce production cost.

A reference circle positioning device for an involute internal gear and a spline relates to the technical field of involute gear measurement and solves the problems that in the prior art, all gears cannot be used as a positioning reference, so that measurement errors exist, existing production requirements cannot be met and the like, the device comprises a positioning shaft system assembly, a positioning reference sleeve and a lever, the positioning shaft system assembly is installed in the positioning reference sleeve and moves and rotates. A positioning reference sleeve is fixed on a bottom plate, a lever is pressed down to lift up a positioning shaft in a positioning shaft system assembly, a measuring ball in a retainer shrinks, a detected product piece is put in, the lever is loosened, and the measuring ball in the retainer is pushed out to be extruded on a gear pitch circle in the detected product piece; and the detected product passes through the two retainers of the positioning shaft system assembly to realize the upper section and the lower section of the detected product. All teeth are considered as positioning references. And the positioning precision is improved.

The invention discloses a design method of a diamond roller for finishing a worm grinding wheel, which comprises the following steps of: firstly, finishing design of an involute gear tooth profile modification curve in a quadratic curve splicing manner, and obtaining a modification involute tooth surface equation based on an involute modification principle; then a meshing coordinate system based on a hypothetical rack method is established, a hypothetical rack tooth surface equation is obtained through meshing solving of the modification involute tooth surface equation, and furthermore, a worm grinding wheel tooth surface equation is obtained through secondary meshing solving of the hypothetical rack tooth surface equation; and finally, establishing a diamond roller trimming worm grinding wheel coordinate system, and obtaining a diamond roller profile according to the worm tooth surface equation in the step B on the basis of a contact line principle. According to the method, the problems that in the process of designing the diamond roller for the multi-section complex modified gear for the new energy automobile, the profile is prone to being concave inwards, and the precision is low are solved, accurate solving of the profile of the diamond roller is achieved, and the design and machining reliability of the diamond roller is improved.

The invention relates to a damage-free collecting device for ultralow single denier diacetate fiber tow production. The damage-free collecting device comprises a tow guiding device, an involute gear double-roller traction mechanism and a hydraulic lifting collecting system. The tow guiding device pre-gathers tows through a plurality of sections of arc bending restraining pieces and a conical contraction pipe, and the stability of the moving track is improved. The traction mechanism adopts a meshing pressure surface to replace traditional friction traction, and is matched with synchronous control of a servo motor to eliminate slipping and damage; the collecting system dynamically adjusts the height of a box body through a hydraulic lifting table, and tows are evenly laid. The method has the advantages that the yarn breakage rate can be effectively reduced, the production stability of the ultra-low single-denier tows for acetate staple fibers is improved, and the method can be suitable for efficient production of 1.3-denier ultra-low single-denier tows and the like.

The invention relates to a machining process of a gear for one-way meshing. The method comprises the following steps: S1, blanking: providing a blank; the blank is subjected to annealing treatment; carrying out shot blasting treatment; carrying out phosphorus saponification surface treatment to promote surface lubrication; two connected cylinders with different sizes are formed in an extrusion material plastic deformation mode; carrying out cold-extrusion flat treading treatment on the blank subjected to cold-extrusion hole shrinkage; pre-forming an outer circle spline extension initial step; carrying out recrystallization annealing treatment; carrying out shot blasting treatment; carrying out phosphorus saponification surface treatment; inner hole ratchet teeth, an outer circle involute gear and an involute straight spline are formed through one-time extrusion; the workpiece obtained after extrusion forming is subjected to turning machining; the turned workpiece is subjected to heat treatment carburizing and quenching treatment; the workpiece subjected to carburizing and quenching treatment is subjected to tempering treatment; and carrying out shot blasting treatment. The single-tooth strength of the inner hole ratchet teeth and the outer circle involute gear is improved, the production efficiency can be greatly improved, and the production cost can be greatly reduced.

The invention relates to the technical field of involute gear and spline gear shaping, in particular to an auxiliary centering device and centering method for an involute gear and spline gear shaping. The core purpose of the invention is to provide a novel auxiliary tool setting tool aiming at the technical defects of low tool setting precision and poor efficiency in the traditional gear shaping machining process, so that the tool setting precision problem is solved, and the production efficiency is improved; and finally, double optimization of the machining quality and the production efficiency is achieved.

The application discloses a kind of micro gear dynamics modeling methods containing rotation pair gap, belong to gear transmission system dynamics simulation technical field.The method is established by considering the calculation model of meshing stiffness of rotation pair gap based on the meshing principle of involute gear and potential energy method, deduces the calculation formula of important parameters such as gear meshing angle, side clearance, coincidence degree, and establishes the time-varying meshing stiffness calculation model of gear containing rotation pair gap;The application comprehensively considers the change of gear pair center distance caused by the existence of rotation pair gap, influences the meshing stiffness of gear, load distribution coefficient, meshing angle and side clearance etc., the change of these parameters will cause gear to present different nonlinear dynamic behavior, provide theoretical support for noise reduction and life extension of gear transmission system.

The invention discloses a reference circle positioning mandrel for an involute internal gear and an involute internal spline, and relates to the technical field of involute gear measurement. The problems that a gear measuring instrument or three coordinates are adopted for detecting the reference circles of the involute internal gear and the internal spline in the prior art, the actual production requirement cannot be guaranteed in the measuring time, only several reference circle points can be selected for measurement in the measuring process, and the measuring accuracy cannot be protected are solved. The tapered roller bearing comprises a tapered mandrel, a retainer formed by printing through the 3D technology, positioning steel balls, a first check ring and a second check ring. The first check ring and the second check ring are installed at the two ends of the taper mandrel, and the holder is installed on the taper mandrel and moves between the first check ring and the second check ring. A certain number of semispherical cavities are arranged in the involute ribs of the retainer, and positioning steel balls used for measuring an M value are mounted in the semispherical cavities. According to the positioning mandrel, all gears are considered in the measurement process, and the measurement repeatability and the measurement result are more accurate.

The invention relates to the technical field of harmonic speed reducers, and provides a high-stability gear speed reducer with a good heat dissipation effect, the high-stability gear speed reducer comprises an input shaft, an output shaft, a first cycloidal gear, a second cycloidal gear and a gear ring, and the output shaft, the first cycloidal gear, the second cycloidal gear and the gear ring are sequentially arranged in the axial direction of the axis of the input shaft; the first cycloidal gear and the second cycloidal gear are both meshed with the inner gear, the gear is an involute gear with short tooth height and large pressure angle, and synchronous reverse input of power is achieved through the arrangement of the first eccentric wheel, the second eccentric wheel and other structures and the arrangement of the input shaft, the first eccentric wheel and the second eccentric wheel which are oppositely arranged in the reverse direction. According to the technical scheme, rotary motion is converted into reciprocating motion of the cycloidal gear by combining the second transmission bearing and the third transmission bearing, efficient speed reduction transmission is achieved through meshing of the small-tooth-difference inner gear and the cycloidal gear, the single-stage transmission ratio is large, the structure is flattened, and the problems that in the prior art, speed reduction transmission efficiency is low and stability is insufficient are solved through the technical scheme.

The invention discloses a worm and gear grinding tooth surface forming method and a transmission error evaluation method considering multi-head grinding wheel base pitch errors, and the method comprises the steps: firstly obtaining parameters such as a gear, a grinding wheel, machining and multi-head grinding wheel base pitch errors, defining the base pitch errors, building a grinding wheel surface model considering the errors, and building a standard involute gear model; then the grinding wheel rotating coordinate system is sequentially converted into a gear rotating coordinate system through coordinate transformation, tooth surface generation operation is conducted, and the tooth surface morphology is obtained; and finally, carrying out fast Fourier transform analysis on the tooth surface ripples, extracting tooth surface features and evaluating the ghost frequency noise risk. According to the method, the influence of the base pitch error of the multi-head grinding wheel can be accurately considered in the tooth surface generation process, tooth surface morphology prediction and howling risk analysis are achieved, and high universality and engineering application value are achieved.

The invention relates to the asymmetrical curvilinear involute profile gear (10) used in external gear pumps, which reduces flow fluctuation and, thus, noise level, reduces cavitation phenomenon, and ensures efficient operation.

This invention discloses a precision shaping process for involute gear parts, comprising the following steps: placing the parts to be processed sequentially and intermittently on a strip of material, and processing the parts on the strip of material using a continuous die; punching guide holes in the strip of material with the parts to be processed; rough punching the parts to be processed to create positioning side edges and small holes; shaping the small holes of the parts after arranging two empty steps; shaping the positioning holes of the parts; performing semi-finish blanking on the tooth profile of the parts; and finishing the tooth profile of the parts and blanking. This precision shaping process for involute gear parts addresses the characteristics of small part size and small involute tooth width, resulting in a small amount of tooth profile shaping. By using a single continuous die, the parts are processed to achieve high-precision tooth profile dimensions and high-precision tooth profile surface roughness.

A gear having volume expansion for cavitation reduction in a gear pump mesh. The gear has a gear tooth profile; a body; a plurality of involute gear teeth extending radially outward from the body and including first and second neighboring gear teeth each having a respective tip and a root, the first and second neighboring gear teeth defining a space between them; and a root pocket formed directly into the roots of the gear teeth and in the space between the gear teeth, providing an increased gear root volume and adding trapped fluid compliance while leaving unaltered the gear tooth profile. Also disclosed is a gear pump including the gear.

The application discloses a high-power stepless speed regulation system based on differential planetary transmission and a control method, and belongs to the field of mechanical transmission. The system comprises a main shell, an inner spline groove is arranged in the middle section of the inner wall of the main shell, an input end cover is arranged on the axial right end surface of the main shell, an output end cover is arranged on the axial left end surface of the main shell, the input end cover and the output end cover are fixedly connected to the corresponding end flange mounting surfaces of the main shell through bolts, and a sun wheel shaft assembly, a planetary wheel assembly, an inner gear ring and a planetary carrier assembly are sequentially arranged in the main shell from inside to outside along the radial direction. The differential planetary transmission structure that the planetary wheel assembly is simultaneously rigid involute gear meshed with the outer teeth of the sun wheel and the inner teeth of the inner gear ring is arranged, all working torques are transmitted in a pure mechanical gear meshing mode, and therefore, the effects that the transmission efficiency is high, the bearing capacity is strong, and the power density is obviously superior to that of a hydraulic transmission and a friction transmission scheme are achieved.

The present invention belongs to the technical field of fluid machinery structures, and particularly relates to a composite gear pump structure. It comprises a pair of external meshing involute gear pumps and several pairs of internal meshing cycloid gear pumps. The external meshing involute gear pumps comprise a driving gear, a driven gear, a driving gear shaft, and a driven gear shaft. The driving gear shaft and the driven gear shaft are mounted on a lubricating oil pump mounting seat, with the driving gear mounted on the driving gear shaft and the driven gear mounted on the driven gear shaft. During operation, the driving gear shaft drives the driving gear and several pairs of internal meshing cycloid gear pumps mounted thereon to rotate in phase, the driving gear drives the driven gear to rotate in the opposite direction, the driven gear drives the driven gear shaft to rotate in phase, and the driven gear shaft drives several pairs of internal meshing cycloid gear pumps mounted thereon to rotate in phase. The present invention increases the operating speed range of the external meshing involute gear pump and shortens the axial length of the internal meshing cycloid gear pump to meet the design requirements of high-speed, high-flow lubricating oil pumps.

The invention discloses a pin gear of a high-precision RV speed reducer, and relates to the field of speed reducer pin gear design. Based on the contact characteristics between pin gear housings, the tightness of meshing and gaps between involute tooth profiles is analyzed, the shape design of the pin gear is optimized, and the pin gear of a vertically symmetrical segmented structure is designed, namely, the upper half part is in a circular arc drum shape, and the lower half part is in a circular arc drum shape; the contact stress distribution of the pin gear and the pin gear housing is effectively improved, automatic centering and error compensation are achieved, lubrication is optimized, the involute tooth profile of the lower half portion is achieved, transmission and movement stability are effectively and accurately achieved, load sharing is optimized, and edge contact is avoided. Based on the meshing area and load stress distribution of the pin teeth and the involute gear, the design of the number of the pin teeth is optimized, the contact pressure of a single pin tooth is reduced, and therefore abrasion is reduced; the 18CrNiMo7-6 steel is selected to manufacture the pin gear, the heat treatment process is optimized, and the effects of reducing the material consumption, reducing the weight, enhancing the flowing of internal lubricating oil, reducing the temperature rise and reducing the heat treatment deformation risk can be achieved.

The invention discloses an on-machine measurement modification parameter identification method for a large-specification involute gear. The method specifically comprises the following steps: step 1, determining an optimal fitting order of an error curve by utilizing a moss growth optimization algorithm; 2, fitting on-machine measurement original data with the optimal fitting order to obtain an initial overall curve, and then obtaining an approximate derivative curve of the initial overall curve; 3, according to the approximate derivative curve, judging whether the shape modification type is upper and lower end portion edge modification or drum shape modification; 4, if edge trimming is carried out on the upper end and the lower end, a top edge trimming starting end point and a root edge trimming tail end point are recognized according to the approximate derivative curve, fitting is carried out according to the two end points to form a final error curve, and then the shape trimming amount is obtained according to the final error curve; 5, if drum shape modification is carried out, the bulging height is recognized, then parabola fitting is carried out, and the drum shape quantity is calculated. According to the method, the problem that fitting distortion is easy to occur when polynomial fitting is directly carried out on measured original data in the prior art is solved.

The application belongs to the technical field of tunneling construction equipment, and discloses a design method of a multi-tooth rock breaking cutter of a cutter head of a honeycomb type tunnel boring machine. The design method designs involute gear cutting tooth structure at the overall circumference of a cutter ring of a rolling cutter, and simultaneously uses radial force and shearing force generated by gear cutting to break rocks, so as to replace the traditional rolling cutter which only relies on the extrusion force and impact force of the cutter head to cut and break rocks, and to realize high-speed cutting construction of the tunnel boring machine. Meanwhile, the traditional solid connecting structure cutter shaft is improved to be a honeycomb type porous structure rolling cutter shaft. The honeycomb structure is composed of a series of hexagonal or other polygonal honeycomb structures arranged in the shaft body in a regular manner, and forms a continuous, uniform and periodic topological structure. The structure design improves the durability and stability of the cutter shaft under harsh working conditions on the premise of ensuring that the cutter shaft has sufficient strength and rigidity, thereby prolonging the service life of the cutter shaft.

The application belongs to the technical field of gear machining, and discloses a gear milling blade and a disc-shaped milling cutter. The gear milling blade is installed on the end face of the milling cutter disc, and comprises a top blade, a secondary blade and a side blade. The top blade is arranged between the side blade and the secondary blade. The outer contour line of the top blade protrudes towards the workpiece to be machined. The outer contour line of the top blade comprises a top blade arc line and a transition curve. One end of the top blade arc line is connected with the outer contour line of the side blade, and the other end of the top blade arc line is an end point E. One end of the transition curve is connected with the end point E and is tangent to the end point E. The other end of the transition curve is connected with the outer contour line of the secondary blade. The gear milling blade has the contour shape of the transition curve, which can effectively improve the curvature distribution on the dedendum transition curve, increase the curvature radius of the dedendum transition curve, and reduce the dedendum stress when cutting the gear slot, thereby improving the dedendum strength of the involute gear.