788 results about "Gear system" patented technology

The invention belongs to an electromechanical braking system in the technical field of vehicles, and discloses a driving and parking braking torque mutual coupling redundancy electromechanical braking system which comprises a brake assembly, an MGU and shell, a driving braking motor and gear reducing mechanism assembly, a gear system bearing support and an ECU controller assembly. The service braking gear reduction mechanism assembly comprises a service braking first-stage reduction gear train mounting mechanism, a second-stage reduction gear train mounting mechanism and a bearing, and the parking braking gear reduction mechanism assembly comprises a parking first-stage reduction worm and gear mechanism, a second-stage reduction worm and gear mechanism and a mounting bearing. The braking torque of the driving braking and the braking torque of the parking braking are mutually coupled, the two systems can share the braking output gear shaft assembly, the driving braking and the parking braking can be independently operated, and meanwhile the parking braking can assist the driving braking when needed. By means of the design, the safety and reliability of the braking system are improved.

The invention relates to a spiral bevel gear system dynamics modeling method based on bidirectional fluid-solid coupling, and belongs to the technical field of aviation transmission, and the method comprises the following steps: S1, calculating the radial deformation and deformation speed of an elastic ring through an analytical method; s2, solving a transient control equation of oil film pressure by taking the radial deformation and the deformation speed of the elastic ring calculated in the step S1 as input to obtain ERSFD internal and external oil film pressure distribution; obtaining a rigidity coefficient and a damping coefficient of the oil film through numerical integration; s3, establishing a kinetic model of the spiral bevel gear transmission system by adopting a lumped parameter method, and deducing a differential equation of the gear system; and S4, through the ERSFD oil film dynamic characteristics calculated in the S2, internal excitation and external excitation are comprehensively considered, an ERSFD-spiral bevel gear system coupling dynamic response result is obtained, the modeling method considers the influence of the elastic ring boss structure characteristics and the complex coupling relation oil film-elastic ring current-solid coupling effect, and the accuracy and calculation efficiency of the model are improved to the maximum extent.

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 for moving the second component relative to the first component. The drive mechanism includes a drive motor drivingly connected to a first gear member having conical involute teeth. A second gear member includes conical involute teeth in meshing engagement with the conical involute teeth of the first gear member. The conical involute teeth have a tapered tooth thickness, a tapered root and a tapered outside diameter.

The motorcycle comprises a frame, a walking assembly, a power assembly, a transmission system and a reverse gear system, and the transmission system comprises a speed change assembly. The reverse gear system comprises a driving mechanism and a switching mechanism, the switching mechanism is arranged between the driving mechanism and the speed change assembly, the switching mechanism is in transmission connection with the driving mechanism, the driving mechanism comprises a driving motor and a driving part, at least part of the driving part is arranged on the driving motor and is in transmission connection with the driving motor, and the driving part is further in transmission connection with the switching mechanism; the driving motor can drive the driving part to rotate, transmission connection or separation between the switching mechanism and the speed change assembly can be driven through rotation of the driving part, and the rotating axis of the driving motor and the rotating axis of the driving part are not overlapped. Through the arrangement, the structure of the reverse gear system can be simplified, and the working efficiency of the reverse gear system is improved.

An apparatus for the extrusion of a solid wire into a resin or paste is disclosed. The apparatus consists of two main parts including an adapter for constraining the wire until mixing with the resin or paste (‘wire injector’), and a motor-driven gear system that feeds the wire into the injector (‘wire extruder’). With this system, a bare wire can be extruded allowing for the creation of lead-in / lead-out sections, or for use with a resin or paste without an inherent curing, drying, or solidifying mechanism. Additionally, this apparatus allows for the extrusion of small (30-40 AWG) wires, enabling unique applications such as the injection of a resistive wire where smaller diameter wires are advantageous for minimized electrical or thermal overhead.

The invention discloses a planetary gear system digital twin model updating method based on deep reinforcement learning. The planetary gear system digital twin model updating method comprises the steps of S1, simplifying a planetary gear system; s2, describing the kinetic model by using a lumped parameter method, and constructing a planetary gear train oscillatory differential equation set; s3, a frequency response function family is calculated through finite element analysis, and a planetary gearbox rigid-flexible coupling model, namely a digital twinborn body, is constructed; s4, vibration response of the planetary gearbox shell under the stable rotating speed is obtained through a vibration signal collecting device; s5, defining an action space and a state space, and establishing a reinforcement learning environment; s6, solving the oscillatory differential equation set to obtain a simulation response, and constructing a reward function according to the simulation response; step S7, setting neural network parameters; step S8, optimizing by using a deep reinforcement learning algorithm; and step S9, loop iteration is carried out, the optimal physical parameters of inversion are output, and updating of the digital twinborn body is realized.

Provided is a method for predicting vibration response and stiffness degradation of a helical gear. The method includes: establishing a lumped parameter dynamic model of a gear system according to a meshing condition of a pair of gears, considering that the gear system is a multi-degree-of-freedom system under the action of a deterministic force and a random force, establishing a digital twin model of the system at multiple time scales of characteristic time and running time, calculating a translation-vibration coupling control equation, establishing a grey box model by combining unscented Kalman filter with machine learning, performing combined state parameter estimation upon collected data to construct a state prediction framework, and predicting stiffness degradation at a running time scale. Response of a nonlinear multi-degree-of-freedom system can be predicted, and the residual stiffness of the gear is predicted through the collected data.

The invention relates to the technical field of furnace shell welding, in particular to a gas industrial furnace shell welding device which integrates a radial circular seam and an axial longitudinal seam, a servo motor drives a planetary gear train through an intermittent sheave, a rotating shell drives a clamped furnace shell to rotate, and radial welding is completed; after a bottom clamping jaw instantly locks a shell, power is switched to a planet carrier, an outer mounting arm drives a driven scraping arm to grind the inner wall while axially moving, welding and grinding synchronization is achieved, a bidirectional pushing seat crank sliding block mechanism continuously rotates in a one-way mode to push and pull the furnace shell in a two-way mode, whole-circle accurate grinding is achieved during resetting, and six sets of air cylinder lead screw adjustable clamping jaws conduct internal and external synchronous supporting. The outer supporting cylinder is prevented from deformation, secondary clamping is not needed in the whole process, butt joint of multiple sections of furnace shells is completed at a time, continuous filling of a longitudinal weld bead can be completed when a circular seam is still in a high-temperature plastic stage through instantaneous switching of clamping and stopping, and the welding quality of a T-shaped connector area is improved.

The invention relates to the technical field of mechanical transmission, in particular to a reinforcement learning compensation method and system for gear multi-body dynamics constraint, and the method comprises the steps: building a multi-body dynamics digital twinborn model containing bearing rigidity and gear meshing force; constructing an adaptive reward function based on nonlinear manifold mapping, and dividing a system state space into a small deviation domain and a large deviation domain according to an angle deviation threshold value; training the multi-body dynamic model based on a depth deterministic strategy gradient algorithm to obtain a compensation strategy; the obtained compensation strategy is applied to a multi-body dynamic model, and an optimal compensation signal is obtained through self-adaptive fusion of static compensation and dynamic compensation, so that the training efficiency of a reinforcement learning algorithm in a complex nonlinear system is improved, the adaptability of the system to working condition changes is enhanced, the vibration of a gear system is remarkably reduced, and the reliability of the system is improved. The angle control precision is improved, and the service life of equipment is prolonged.

The invention provides an electric drive axle assembly and a vehicle with the same, and relates to the technical field of vehicles. The electric drive axle assembly comprises a drive motor; the differential mechanism is connected with a vehicle wheel end through a half shaft; the first planetary gear train at least comprises a first sun gear and a first planetary gear, the first sun gear is connected with an output shaft of the driving motor, and the first planetary gear is arranged on a first planetary carrier; the second planetary gear train at least comprises a second sun gear and a second planetary gear, the second planetary gear is arranged on a second planetary carrier, and the output end of the second planetary carrier is connected with the differential mechanism; and the transmission gear system is connected with the first planetary gear system and the second planetary gear system, and the transmission gear system is used for transmitting power of any one of the first planet carrier and the first sun gear to any one of the second planet carrier and the second sun gear. The problems that an electric drive axle of a commercial vehicle is large in size and unreasonable in gear-speed ratio setting are solved.

A locking system for doors of a deployable aircraft landing gear system includes a spring-biased swing arm configured to be pivotally attached to a body of an aircraft and including a roller at a distal end of the swing arm. The swing arm is configured to engage with a portion of a first landing gear bay door to prevent the first landing gear bay door from opening.

A gear system is provided for a wheel of a tractor. The gear system includes a plurality of planet gears and a plurality of rollers. The planet gears are operable to rotate to provide tractive force to the wheel. The rollers are operable to abut against an inner ring of the wheel to reduce a contact force from the wheel contacting a channel on the plurality of planet gears.

The invention provides a drilling rig for geological exploration, and relates to the technical field of drilling, the drilling rig comprises a motor mounted on a lifting frame, the extending end of the motor is connected to an inner rod, an outer wheel is coaxially arranged outside the inner rod, a plurality of fixing rods are arranged at the upper end of the outer wheel at equal intervals, and the fixing rods are connected to the inner rod. The drilling device has the most prominent advantage that the drilling device has a unique anti-jamming protection mechanism, when a sampling pipe is jammed by a hard stratum or foreign matters in the drilling process, the sampling pipe can be prevented from being blocked by the anti-jamming protection mechanism, and the sampling pipe can be prevented from being blocked by the anti-jamming protection mechanism, so that the sampling pipe can be prevented from being blocked by the anti-jamming protection mechanism. Power transmission between the motor and the sampling pipe is not rigid connection any more, controlled separation is achieved through a designed combination of a gear system and a friction disc, the motor continues to operate, but not all torque is directly transmitted to the clamped sampling pipe, part of energy is converted into surrounding motion through a rotating wheel system, and therefore the sampling pipe can be separated. And the risk of burnout of the motor due to overload is effectively avoided.

The invention discloses an efficient scrap steel crusher, and relates to the technical field of scrap steel crushing. Comprising a mounting frame, and a main crushing roller and an auxiliary crushing roller are rotationally connected into the mounting frame; the mounting shell is fixedly connected to the mounting frame, and a sun gear, a planet carrier, a planet gear and a gear ring which are used for forming a planetary gear train are arranged in the mounting shell; the gear box is mounted on the mounting shell, and an output gear is rotationally connected into the gear box; the mounting cylinder is arranged on the planet carrier and is rotationally connected with the mounting shell; and the detection assembly is arranged on the main crushing roller and is used for detecting the rotating speed difference between the main crushing roller and the mounting cylinder. The rotating speed difference of the main crushing roller and the mounting cylinder is detected, the rotating speed of the main crushing roller and the mounting cylinder is adjusted according to the rotating speed difference, the rotating speed of the main crushing roller is reduced when the load of the main crushing roller is large, the torque of the main crushing roller is increased, the material blocking probability is reduced, and then the waste steel crushing efficiency is improved.

The invention relates to an epicyclic gear with a housing, a sun gear, a planet carrier, at least one planet gear and a ring gear. The planet carrier is rotatably mounted in the housing. The housing defines an assembly direction for mounting the planet carrier. A bearing seat of the planet carrier, which serves for the rotatable mounting of the planet carrier in the housing and which is arranged adjacent to an insertion end of the planet carrier and in the use position of the planet carrier in the assembly direction behind the ring gear, has a diameter which is smaller than an inner diameter, in particular than a tip diameter, of the ring gear.

An easily transportable exercise assembly has a platform housing that can support a user during an exercise. The exercise assembly has at least one gear system that has comprises a first face gear having a first plurality of concentric gear rings and a second face gear having a second plurality of concentric gear rings. There is a resistance mechanism within the platform housing. A first cable is operatively coupled with the first face gear and the resistance mechanism. A second cable is operatively coupled with the second face gear. The user of the exercise assembly manipulates an end of the second cable to experience a resistance in the second cable imparted from the resistance mechanism through the at least one gear system subassembly.

The invention belongs to the technical field of gear transmission system fault diagnosis, and particularly relates to a gear pitting kinetic model solving method based on microscopic surface topography. Comprising the following steps: establishing a tooth surface morphology and pitting defect model; the tooth surface morphology of the selected gear is sampled, and nonlinear excitation parameters in a gear transmission system are collected; a gear tooth surface morphology mathematical model based on the fractal dimension D and the fractal roughness G is established, and a mixed elastohydrodynamic lubrication coupling analysis mathematical model of the pitted gear under the rough surface is established based on the relation that the curvature radius, the dynamic load, the oil film entrainment speed and the like change along with the change of the meshing position under different surface roughness. And solving the non-linear dynamic mathematical model of the gear with the rough surface. According to the method, the influence of the surface roughness on the rigidity attenuation and pitting extension of the gear can be accurately quantified, the nonlinear dynamic behavior of the gear system under the complex lubrication condition is disclosed, and an analysis method support is provided for the pitting resistance design and life prediction of the gear.

The invention belongs to the technical field of gear transmission, and discloses a dynamic modeling method of a flexible bevel gear system considering meshing point change, which is used for analyzing vibration response and dynamic stress response characteristic laws of the bevel gear system in a traveling wave resonance state. And further analyzing the traveling wave resonance phenomenon of the spiral bevel gear system in the aero-engine accessory casing. A three-dimensional shell unit and a beam unit are adopted to establish a bevel gear pair finite element entity model. A dynamic model of the flexible bevel gear system considering meshing point changes is established by adopting a substructure modal synthesis method and a rotation modal projection method. The reliability of the provided model is verified through a finite element entity model and an experimental test result. On the basis, dynamic response and vibration stress experiment tests are combined, and the traveling wave resonance phenomenon of the bevel gear system is researched. The research result of the provided model has theoretical significance on design and fault monitoring of the aero-engine bevel gear system.

The invention discloses a steel bridge deck slab U rib laser arc hybrid welding method and device, and relates to the technical field of welding equipment.The device comprises a device body, positioning mechanisms and a smoke discharging mechanism, the device body is placed at the top of a rib plate, a steel plate is arranged at the bottom of the rib plate, and the positioning mechanisms are arranged at the two ends of the device body; the welding device comprises a device body and a positioning mechanism, the positioning mechanism is used for fixing the device body to the top of a rib plate, a welding mechanism is arranged at the top of the device body and used for welding the two sides of the rib plate and a steel plate, and an exhaust fan is arranged on one side of the welding mechanism. Accurate and stable welding positioning and fixing are achieved, according to the mechanism, the bevel gear system is driven by rotating the rotating disc, then the threaded rod and the connecting block are driven to move, clamping of the rib plate by the limiting wheel is achieved, and according to the design, welding accuracy and reliability are improved, and vibration and displacement in the welding process are reduced.

The invention discloses a vibration analysis method, device, medium and equipment for a vehicle electric driving system, and relates to the technical field of electric digital data processing, and the method comprises the steps: analyzing excitation characteristics and gear engagement dynamic load parameters based on a motor electromagnetic excitation and gear system dynamics model, and taking the excitation characteristics and the gear engagement dynamic load parameters as a mechanical excitation coupling motor, gear, bearing and shell model; according to the method, a rigid-flexible coupling dynamic model is formed, after the rigid-flexible coupling dynamic model is converted into a state-space equation, multivariable time-domain data are obtained through nondimensionalization and piecewise linear method solving, and then the transmission efficiency value of vibration energy among a motor, a gear, a bearing and all parts of a shell is calculated based on excitation characteristic parameters, gear meshing dynamic load parameters and the multivariable time-domain data. And positioning a key noise transmission path of the vehicle electric driving system according to the transmission efficiency value. By comprehensively analyzing the vibration characteristics of the system, the NVH problem of high-frequency howling and the like under the high-speed working condition is effectively solved.

The invention discloses a gear transmission system nonlinear dynamic modeling method and system considering thermal deformation, and relates to the technical field of gear transmission system dynamic simulation. The method comprises the steps that component parameters and operation parameters of the planetary gear system are received; based on the component parameters and the operation parameters of the planetary gear system, a tooth surface flash temperature model is constructed, and a tooth surface friction coefficient is obtained through calculation; and constructing a tooth profile thermal deformation model, and respectively calculating internal excitation of the planetary gear system considering tooth profile thermal deformation. According to the method, the gear surface flash temperature model, the tooth profile thermal deformation model and the bearing gap model are constructed, the helical tooth planetary gear train-bearing nonlinear dynamic model is established, and the technical defect that the gear temperature rise effect and the nonlinear factors of the bearing cannot be fully considered in traditional helical tooth planetary gear train dynamic modeling is overcome; and the vibration response prediction precision under the high-speed and heavy-load working condition is obviously improved.

The invention provides a random rotation speed-oriented gear meshing stiffness calculation method, which belongs to the technical field of gear performance evaluation, and comprises the following steps: describing the actual operation state of a gear system by using a random rotation speed; determining the total potential energy of the gear according to the acting force of the meshing points; solving the total potential energy of the gear to obtain a potential energy calculation function about a meshing rotation angle; determining a meshing stiffness calculation function about the meshing rotation angle by using the potential energy calculation function; solving an average value of a single-tooth meshing area and a double-tooth meshing area of the meshing stiffness calculation function; and the meshing rigidity is simplified into a square wave function through the average value, and the meshing rigidity is changed into a time function from a corner function through the generated random rotating speed. According to the method, the running state of the gear system is described by using the random rotating speed, the influence caused by random fluctuation of the rotating speed is considered, the meshing rigidity of a wind power gear box and the like in the actual working environment can be reflected more truly, and the accuracy and applicability of meshing rigidity calculation are remarkably improved.

A cross-contamination free and multiple laboratory sample grinder includes: a controller unit having a motor and a controller unit; a tube receptacle unit, removably laid on top of the controller unit, comprises a plurality of compartments designed to contain a plurality of laboratory tubes; and a top housing unit, removably laid on top of the tube receptacle unit, comprises an array of pestles coupled to a gear system that is operated by that motor. The top housing unit comprises a handle and a roller connector having a pair of wheels when rotated operable to eject the array of pestles into the plurality of laboratory tubes.

Systems and methods for mechanically rotating an aircraft about its center-of-gravity (CG) are disclosed. The system can enable the rear, or main, landing gear to squat, while the nose landing gear raises to generate a positive angle of attack for the aircraft for takeoff or landing. The system can also enable the nose gear and main gear to return to a relatively level fuselage attitude for ground operations. The system can include one or more hydraulically linked hydraulic cylinders to control the overall height of the nose gear and the main gear. Because the hydraulic cylinders are linked, a change on the length of the nose cylinder generates a proportional, and opposite, change in the length of the main cylinder, and vice-versa. A method and control system for monitoring and controlling the relative positions of the nose gear and main gear is also disclosed.

The utility model relates to the technical field of transmission, in particular to a double-motor stepless speed change electric drive system. The double-motor stepless speed change electric drive system comprises a first motor, a second motor, a planetary gear train, a pedal crankshaft, a sun wheel overrun clutch and a gear ring overrun clutch. The sun gear and / or the gear ring are / is set as power input, and the planet carrier is set as power output; a rotor of the first motor can be connected with the sun gear, and a rotor of the second motor can be connected with the gear ring through the gear ring overrunning clutch. The gear ring is locked by the gear ring overrun clutch and can only rotate in the forward direction. The pedal crank shaft is connected with the sun gear through the sun gear overrun clutch so that torque can only be transmitted from the pedal crank shaft to the sun gear. Therefore, the double motors can cooperate with the planetary gear train to jointly meet the speed change requirement.

This is a lightweight and portable sit-to-stand lift that can be easily assembled. It comes with components that can be stowed on a transport wheelchair. The lift is designed with a grab bar in the handicap bathroom, which supports the wheelchair user and eliminates the need for a heavy base as part of the lift. It features a low-cost, non-backdrivable gear system and is driven forward and reversed by the hand-held flexible ratchet, contributing to greater portability.

This technology provides an advantage in reducing manufacturing costs when incorporating pin bodies into eccentric oscillating gear systems. [Solution] The system comprises a crankshaft 14 having an eccentric portion 12, a rocking member 16 that is rocked by the eccentric portion 12, an external gear group 18 that rocks together with the rocking member 16, an internal gear 20 that meshes with the external gear group 18, a first lateral member 22 positioned on one axial side with respect to the rocking member 16, and a pin body 46 that synchronizes the rotational component of the rocking member 16 with the first lateral member 22, with contact being made with a first recess 50 provided in the rocking member 16 and a second recess 52 provided in the first lateral member 22, respectively, wherein the pin body 46 is rotatably provided inside the first recess 50 and the second recess 52, respectively.

The invention discloses a planetary gear dynamic characteristic prediction method. Comprising the following steps: carrying out a planetary gear dynamic transmission test on a real planetary gear test bed, carrying out dynamic modeling on a healthy planetary gear, describing the vibration of a planetary gear system by adopting a fixed coordinate system fixed on a gear ring, providing a dynamic characteristic type, responding to signal analysis, and carrying out dynamic transmission. Comparing and judging the result obtained by analyzing the response signal obtained by the test with the result obtained by analyzing the response signal, and establishing a planetary gear dynamic fault knowledge base system, so as to form digital-analog combination in the field of planetary gear transmission, which is beneficial for identifying the dynamic characteristics of planetary gear transmission. The prediction efficiency of the dynamic characteristics of the planet gear and the prediction precision in the field of fault identification are improved, and the accuracy of dynamic characteristic identification is improved through continuous test and model interaction. And a planetary gear transmission dynamic characteristic knowledge base system is established to realize rapid and accurate analysis of vibration signals captured in tests and projects.

An activation system having a fixed protective plate (10) in which there are fixed drive means based on a reset coil (1) and a holding coil (2) and release means arranged in alignment, a mobile wedging means activated by the drive means, and wherein these mobile wedging means are arranged in parallel with respect to the drive means, one or two wedging rollers (6) according to if said roller is for a one-way safety gear system or for a two-way safety gear system, respectively. A compact system that can be adapted to the existing safety gear is achieved, wherein electromechanical drive is executed vertically, which saves in additional levers, susceptibility to failure is lower and the reset and holding coils are smaller.

An assembly is provided for a turbine engine. This assembly includes an inner tower shaft, a layshaft, an outer tower shaft, an intermediate gear system, an inner gearbox and an outer gearbox. The layshaft is coupled to the inner tower shaft through an inner bevel gearing connection. The outer tower shaft is coupled to the layshaft through an outer bevel gearing connection. The intermediate gear system is configured to transfer mechanical power from the inner tower shaft to the layshaft and the outer tower shaft. The intermediate gear system includes the inner bevel gearing connection and the outer bevel gearing connection. The inner gearbox is coupled to the intermediate gear system through the layshaft. The outer gearbox is coupled to the intermediate gear system through the outer tower shaft.