512 results about "Roller screw" patented technology

Provided is an electric heavy-load push-pull tool including a power input unit, a power conversion unit and a power output unit. Through the transmission design of multiple stages of reducers and a planetary roller screw of a downhole operation tool, low-speed and high-torque power output of the motor is realized. The heavy-load push-pull tool provided by the present disclosure can not only provide large-torque thrust force, but also provide large-torque pulling force. A forward direction of a transmission nut is based on a rotation direction of a motor. By controlling the forward rotation or reverse rotation of a transmission shaft of the motor, the forward or backward movement of an operation tool can be realized at low cost through power transmission.

The invention discloses a reverse type annular tooth groove planetary roller screw which comprises a nut, a screw rod, a plurality of rollers and a retainer, a multi-head internal thread is arranged in the nut, the rollers and the screw rod are both of an annular tooth groove structure without a helix angle, and the annular tooth grooves of the rollers are meshed with the internal thread of the nut and the annular tooth grooves of the screw rod respectively; first gears are machined at the two ends of the annular tooth groove of the lead screw, second gears are machined at the two ends of the annular tooth groove of the roller, and the first gears are meshed with the multiple second gears at the same time. The retainer is of an integral flexible retainer structure, and the pin rollers have the self-adaptive capacity in multiple directions in the circumferential direction and the radial direction through the retainer. And an arc-shaped roller path is designed on the screw rod and is matched with the ball spline housing to play a linear rolling guiding and rotation stopping role on the screw rod. The reverse lead screw has the advantages of being large in transmission ratio, compact in structure, easy to machine and assemble, low in cost, good in self-adaptive performance, high in positioning precision, good in reliability and the like.

The invention relates to the technical field of high-precision transmission, and particularly discloses a retainer and a circulating type planetary roller lead screw pair. Wherein the retainer comprises a circular ring-shaped main body, a plurality of pin roller guide grooves which are uniformly distributed in the circumferential direction are formed in the circular ring-shaped main body, the pin roller guide grooves extend in the radial direction of the circular ring-shaped main body, and openings penetrating to an inner hole in the circular ring-shaped main body are formed in the radial inner ends of the pin roller guide grooves; the two sides of the opening are shrunk inwards to form shrunk openings, and the shrunk openings are elastic. According to the structure, the retainer is in the shape of the circular ring and is arranged on the side face of the internal thread section of the nut, so that the overall radial size of the circulating type planetary roller screw pair can be reduced, and a reliable structural foundation is provided for achieving miniaturization and microminiaturization of the circulating type planetary roller screw pair; the roller guide grooves are provided with the openings, the radial size of the retainer can be made smaller, and therefore the overall radial size of the circulating type planetary roller lead screw pair is made smaller.

The invention discloses a roller screw external thread grinding force measuring method. The method comprises the steps that a to-be-measured screw is installed on an external thread grinding machine tool in the mode that the to-be-measured screw is clamped by tips at the two ends of the machine tool; the two mechanical sensors are installed at the center position right facing the lead screw to be measured and face the normal grinding force direction and the tangential grinding force direction respectively; a to-be-measured lead screw clamped by double tips is regarded as a simply supported beam structure of which one end is fixed and hinged and the other end is movable and hinged, a mechanical sensor is regarded as an elastic support, a mechanical model is established, and the relationship among the measurement result of the mechanical sensor, an actual method and tangential grinding force at different grinding positions is obtained; and according to the measurement result of the mechanical sensor, the actual method and the tangential grinding force are obtained by utilizing the relation between the measurement result of the mechanical sensor at different grinding positions and the actual method and the tangential grinding force, and the actual grinding force is obtained after vector superposition. The device has the characteristics of clear and definite measurement principle, accurate and reliable measurement result, simple structure and convenience in assembly.

The invention relates to a linear actuator with power-off self-locking and constant supporting force. The linear actuator comprises a driving assembly, a gas spring unit, a braking assembly and a planetary roller lead screw pair. The driving assembly converts electric energy into rotating kinetic energy to drive the actuator to operate. The air spring unit provides constant supporting force through a built-in high-pressure air cavity, and the pressure is adjusted through an inflation valve so as to dynamically adjust the supporting force. The braking assembly realizes power-off self-locking through a movable permanent magnet and a liquid sealing structure; the planetary roller lead screw pair converts rotation kinetic energy of the driving assembly into linear motion. The technical problems that an existing linear actuator is high in energy consumption, unstable in supporting force and lack of a self-locking function are solved.

The invention relates to the technical field of planetary roller screw assembly methods, in particular to an assembly method of a reverse planetary roller screw pair. In order to solve the technical problem that the assembling mode of an existing planetary roller lead screw pair has defects, the radial retainers and the circumferential retainers are used, and the assembling process is simplified as follows: a lead screw and a roller are rapidly assembled into an integrated module, and then the integrated module and a nut are rapidly assembled. By means of the mode, the lead screw and the pin roller can be efficiently and conveniently assembled, the transmission precision and performance of the reverse type planetary pin roller lead screw pair are guaranteed, and meanwhile the overall assembling efficiency of the reverse type planetary pin roller lead screw pair is improved. And the radial retainers and the circumferential retainers are simple in structure, simple in assembly process and easy to match with intelligent equipment such as mechanical arms, so that industrialized automatic assembly can be realized.

The invention discloses a planetary roller screw dynamic modeling method based on a generalized finite element method, and belongs to the field of dynamic characteristic analysis of planetary roller screws. The method comprises the following steps: carrying out unit division on a planetary roller screw finite element model; constructing a dynamic model of each type of unit; respectively establishing mass matrixes, stiffness matrixes, damping matrixes and load column vectors of the shaft section unit, the lead screw-roller contact side thread meshing unit, the nut-roller contact side thread meshing unit and the roller tooth-inner gear ring gear meshing unit; and assembling a system dynamics model to complete planet roller screw dynamics modeling. According to the method, the dynamic characteristics of the real physical model can be accurately analyzed, and an effective means is provided for analyzing the vibration response of the system.

The invention relates to a special machining device for a reverse nut of a planetary roller screw, which is characterized by comprising a workbench, and a workpiece clamping center, a grinding unit and a turning unit which are arranged on the workbench, a grinding wheel dressing unit is arranged on one side of the workpiece clamping center, a workpiece is clamped on a workpiece clamp assembly in advance, and the grinding wheel dressing unit is arranged on the other side of the workpiece clamping center. Then an electric tool turret of a turning unit is made to be coaxial with the workpiece, the electric tool turret firstly turns an inner hole of the reverse nut semi-finished product, then a grinding component is adjusted to be coaxial with the turned reverse nut semi-finished product, a grinding electric spindle is driven, the grinding component grinds the inner hole of the reverse nut semi-finished product, and the inner hole of the reverse nut semi-finished product is ground. And finally, the dressing motorized spindle is driven, and the dressing grinding wheel is used for dressing the grinding component. According to the turning and grinding integrated technology, the reverse nut is machined in the mode that turning is conducted firstly and then grinding is conducted, the machining efficiency is high, and the production cost is greatly reduced.

The invention relates to a reverse toothless planetary roller screw, and belongs to the technical field of roller screws, the reverse toothless planetary roller screw comprises a screw rod, a long nut, a planet carrier assembly and a plurality of rollers, and the periphery of the screw rod is sequentially provided with a front optical axis section, an external thread section and a rear optical axis section; internal threads are arranged on the inner wall of the nut; each roller comprises a threaded part in the middle and polished shaft parts at the two ends; the thread part of the roller and the external thread section of the lead screw are opposite in rotation direction and equal in lead angle; the planet carrier assembly comprises a middle retainer and end covers at the two ends, at least three opening grooves used for assembling the pin rollers in the radial direction are formed in the outer side of the middle retainer, and positioning holes in clearance fit with the optical axis parts of the pin rollers are formed in the end covers. By canceling a screw rod gear / ring groove and pin roller gear / ring groove structure and combining a double matching mechanism of the planet carrier assembly, the machining bottleneck of a composite structure is thoroughly eliminated, the axial parallelism and the constant lead characteristic of the pin rollers are guaranteed, meanwhile, vibration noise is remarkably reduced, and high-precision and large-scale mass production is achieved.

According to the reverse circulation type planetary roller lead screw pair assembling clamp and the assembling method, the assembling clamp comprises a cam ring clamping mechanism, a roller uniform dispersing mechanism and a retainer clamping mechanism which are coaxially arranged, the cam ring clamping mechanism clamps a first cam ring, the retainer clamping mechanism clamps a retainer, and the roller uniform dispersing mechanism clamps a second cam ring; the pin roller uniform dispersion mechanism is coaxially arranged around the retainer, and when the pin rollers are installed in the groove positions of the retainer, the pin roller uniform dispersion mechanism drives the pin rollers to be attached to the inner wall faces of the groove positions on the retainer. According to the assembling clamp designed for the reverse circulation type planetary roller lead screw pair, the coaxiality of all parts is guaranteed, it is guaranteed that rollers can be evenly dispersed, a lead screw can be conveniently, rapidly and conveniently inserted into a retainer provided with the rollers, and the assembled roller lead screw pair has high precision and good transmission performance; by arranging the assembling clamp and matching with the optimized assembling method, the assembling speed is greatly increased, meanwhile, the assembling precision is improved, and the transmission requirement is met.

The invention discloses a hyperbolic tangent and algebraic sine coupled nut-driven ball screw pair which comprises a ball screw and a ball nut, an inner hole of the ball nut is provided with an inner spiral raceway, the outer cylindrical surface of the ball screw is provided with an outer spiral raceway, and the inner spiral raceway and the outer spiral raceway are matched with each other to form a spiral raceway; the outer cylindrical surface of the ball screw is provided with a ball return channel which is sunken towards the center of the ball screw between two adjacent outer spiral raceways, the ball return channel and the outer spiral raceways of the ball screw are integrally designed, and the ball return channel and the outer spiral raceways form a circulating raceway; according to the internal circulation roller screw pair, the ball screw outer spiral raceway and the ball return channel are integrally designed, the ball screw pair is compact in structure and smooth in operation, the uniformity and consistency of the ball screw and the ball nut are better, meanwhile, the reliability and operation stability of the ball screw pair are improved, and the service life of the ball screw pair is prolonged. And the noise and vibration phenomena during high-speed operation of the ball screw pair are greatly reduced.

The invention discloses a modification and parameter optimization method for a pin roller in a planetary pin roller screw, which comprises the following steps: determining an optimizable modification parameter and range according to a three-section pin roller modification method; establishing a load distribution calculation model considering roller modification; the load distribution calculation model is used for calculating the relationship between the thread tooth deformation and the load distribution state; an initial value of modification parameter optimization is determined, and the load distribution of the planetary roller screw pair in the state is calculated through model iteration; according to the optimization target, updating the modification parameters and then repeatedly calculating the load distribution so as to optimize the modification parameters; and outputting the optimized modification parameters and load distribution. The non-uniform degree of distribution of the thread load of the planetary roller screw pair is reduced after the modification design of the rollers, and is further reduced after the modification parameter optimization, and the uniform distribution of the load is beneficial to improving the bearing performance such as the rated load and the shock resistance and fatigue resistance of the planetary roller screw under the same specification.

The invention discloses an electrically-driven mechanical tread brake unit which comprises an electric brake cylinder, a hoisting arm, a brake-shoe hoist, a brake-shoe holder and a brake-shoe, the electric brake cylinder is provided with a motor located in a shell, and further provided with a planetary gear assembly connected with an output shaft of the motor and a planetary roller screw rod driven by the planetary gear assembly; the planetary gear assembly comprises a sun gear coaxially connected with an output shaft of the motor, an inner gear ring fixed to the shell, a planet gear meshed between the sun gear and the inner gear ring in a tooth meshing mode and a planet carrier connected with the planet gear, the planet roller lead screw comprises a lead screw shaft, a roller and a nut, and the planet carrier is provided with an outer gear ring. A transmission gear is fixed to a nut of the planetary roller lead screw, and an outer gear ring on the planet carrier is meshed with the transmission gear. The planetary gear and the planetary roller lead screw are arranged to replace a traditional force amplification mechanism, low-power output and large torque are achieved, and meanwhile the functions of manually resetting the lead screw and preventing the lead screw from being stuck in the fault state can be achieved.

The invention relates to a multistage planetary roller lead screw pair structure, and belongs to the technical field of electromechanical servo transmission. The linear actuator comprises a first-stage lead screw, a first-stage pin roller, a first-stage nut, an angular contact bearing II, a first-stage actuator cylinder, a second-stage lead screw, a second-stage pin roller, a second-stage nut, a shell and an adapter shaft. Therefore, a nested structure of the first-stage planetary roller screw pair and the second-stage planetary roller screw pair is formed. The large working stroke can be provided within the small retraction size, and the large bearing capacity can be provided through the small radial size; meanwhile, the linear motion speed ratio of different graded lead screw pairs is controlled by adjusting the thread lead of the first-stage lead screw and the second-stage lead screw, accurate control over the motion speed of the tail end effective load is achieved, a guide structure within the stroke range is designed for each stage of nut, and high stability of the tail end output load of the structure can be achieved.

The utility model relates to the technical field of planetary roller screws, in particular to a gearless planetary roller screw, which comprises a nut, a screw and a plurality of rollers. Assembling sections are arranged on the pin rollers; when the lead screw is a driving part, one of the assembling section and the nut is provided with annular teeth, the other one of the assembling section and the nut is provided with an annular groove, and the annular groove is matched with the annular teeth in a meshed mode so that no relative axial displacement exists between the pin rollers and the nut. When the nut is a driving part, one of the assembling section and the lead screw is provided with annular teeth, the other one of the assembling section and the lead screw is provided with annular grooves, and the annular grooves are matched with the annular teeth in a meshed mode so that no relative axial displacement exists between the pin rollers and the lead screw. Aiming at the defects of the existing planetary roller screw, a gear structure is eliminated, burrs generated by gear machining are eliminated, the cleanliness level of the roller is improved, the influence of the burrs on thread meshing is reduced, and the overall service life of the planetary roller screw is prolonged; impact and noise caused by gear meshing are avoided, and the overall NVH level of the planetary roller screw is improved.

A planetary roller screw adapted for solving insufficient structural strength of the conventional planetary roller screw while proceeding with precise motion control is disclosed. The planetary roller screw includes a main screw having an external thread, a nut having an internal thread, and a planetary assembly having rollers. Each roller includes an outer periphery having an external thread. The pitches of the external thread of the main screw, the internal thread of the nut, and the external thread of each roller are identical. The helix direction of the external thread of the main screw is opposite to that of the internal thread of the nut. When one of the main screw, the nut, and the planetary assembly acting as a driving member rotates, a linear displacement direction of the planetary assembly relative to the nut is opposite to that of the main screw relative to the planetary assembly.

The invention relates to a planetary roller screw with contact of concave and convex contact points, and relates to the technical field of planetary roller screws. A roller working tooth profile of the planetary roller lead screw adopts a convex arc tooth profile, a lead screw working tooth profile of the planetary roller lead screw adopts a concave arc tooth profile, and a nut working tooth profile of the planetary roller lead screw adopts a concave arc tooth profile; in the movement process of the planetary roller screw, the roller convex tooth profile surface is in contact with the screw concave tooth profile surface and the nut concave tooth profile surface, the convex tooth profile surface is a working tooth profile surface formed by a convex arc tooth profile curve section, and the concave tooth profile surface is a working tooth profile surface formed by a concave arc tooth profile curve section. The lubricating device has the characteristics of high contact strength, large bearing capacity, high transmission efficiency and good lubricating effect.

The invention relates to the technical field of planetary roller screws, in particular to a gearless planetary roller screw which comprises a nut, a screw body and rollers, and a multi-groove retainer is arranged between the nut and the screw body; when the lead screw is a driving part, one of the assembling section and the nut is provided with annular teeth, the other one of the assembling section and the nut is correspondingly provided with annular grooves, and the annular grooves are matched with the annular teeth, so that no relative axial displacement exists between the pin rollers and the nut; when the nut is a driving part, one of the assembling section and the lead screw is provided with at least one annular tooth, the other one of the assembling section and the lead screw is correspondingly provided with at least one annular groove, and the annular grooves are matched with the annular teeth in a meshed mode so that no relative axial displacement exists between the pin rollers and the lead screw. In order to overcome the defects of an existing planetary roller screw, a gear structure is omitted, burrs generated by gear machining are eliminated, the cleanliness level of a roller is improved, the influence of the burrs on thread meshing is reduced, and the overall service life is prolonged; the overall NVH level of the planetary roller screw is improved, and the machining difficulty and cost are reduced.

The invention provides a reverse differential planetary roller screw uniform load optimization design method, and belongs to the technical field of planetary roller screw transmission uniform load design optimization, and the method comprises the following steps: step 1, on the basis of a reverse differential planetary roller screw thread tooth meshing deformation coordination relationship, a reverse differential planetary roller screw transmission uniform load design is established; constructing a deformation coordination formula of the roller ring groove and the nut ring groove and a deformation coordination formula of the roller thread and the lead screw thread; step 2, acquiring importance of thread tooth structure parameters and the like on uniform load performance by adopting a random forest algorithm, and extracting key influence parameters; step 3, establishing a key parameter and uniform load performance prediction model by using a GA-BP neural network; and step 4, constructing a mass loss and tolerance sensitivity multi-objective optimization algorithm based on NSGA-II, and realizing reverse differential planetary roller screw uniform load multi-objective optimization design taking the processing cost as a constraint condition. By means of the method, the uniform load effect between threads of the reverse differential planetary roller screw can be improved, the bearing capacity is improved, and the service life is prolonged.

The invention discloses a planetary roller screw high-speed operation vibration detection device, and relates to the technical field of planetary roller screw detection, the planetary roller screw high-speed operation vibration detection device comprises a device main body, a mounting seat and a movable seat, the mounting seat is movably mounted at one end of the device main body, the movable seat is movably mounted in the device main body, and two groups of limiting plates are movably mounted at the upper end of the movable seat. Second movable grooves are symmetrically formed in the opposite ends of the two sets of limiting plates, first mounting columns are movably mounted in the multiple sets of second movable grooves, and first clamping plates are mounted at one ends of the multiple sets of first mounting columns. By arranging the movable seat, the limiting plate, the first clamping plates and the second clamping plates, the lead screw drives the roller to vibrate, and the roller transmits the vibration frequency to the sensors in the first mounting columns and the sensors in the second mounting columns through the first clamping plates and the second clamping plates. And the multiple groups of sensors transmit vibration data to the control screen, and the data are collected, so that the accuracy of the vibration detection data of the lead screw is improved.

The invention provides a differential roller screw transmission assembly, which comprises a nut, a screw, a plurality of rollers and a retainer group, the nut is provided with an inner hole penetrating in the axial direction, and an annular tooth section is arranged on the inner circumferential face. The threaded rod is arranged in the inner hole in a penetrating mode, a thread structure is arranged on the peripheral face of the threaded rod, the thread structure is provided with M thread lines, and M is an integer larger than one. The plurality of rollers are arranged between the nut and the screw. Each roller has a uniform pitch diameter, the periphery of each roller is provided with an annular tooth groove structure with a plurality of tooth grooves, and the annular tooth groove structures are meshed with the thread structure of the screw rod and the annular tooth section of the nut. The number of the plurality of rollers is N, and N is a factor greater than one of M. The retainer group is arranged at two ends of the roller. And the spiral angle of each thread line of the screw is matched with the circumferential distance of the plurality of rollers, so that the axial distance between any thread line and the corresponding tooth groove between the two adjacent rollers is equal to the pitch of the annular tooth groove structure. Therefore, the part design and the manufacturing process are simplified, and the load sharing effect is improved.

The invention relates to a reverse toothless planetary roller screw, and belongs to the technical field of roller screws, the reverse toothless planetary roller screw comprises a screw rod, a long nut, a planet carrier assembly and a plurality of rollers, and the periphery of the screw rod is sequentially provided with a front shaft section, an external thread section and a rear shaft section; internal threads are arranged on the inner wall of the nut; each roller comprises a threaded part in the middle and polished shaft parts at the two ends; the thread part of the roller and the external thread section of the lead screw are opposite in rotation direction and equal in lead angle; the planet carrier assembly comprises a middle retainer, and the middle retainer is provided with at least three open grooves used for assembling the pin rollers in the radial direction. By canceling a screw rod gear / ring groove and pin roller gear / ring groove structure and combining a double matching mechanism of the planet carrier assembly, the machining bottleneck of a composite structure is thoroughly eliminated, the axial parallelism and the constant lead characteristic of the pin rollers are guaranteed, meanwhile, vibration noise is remarkably reduced, and high-precision and large-scale mass production is achieved.

Provided are a micro-lead differential-type planetary roller screw and an electric cylinder. A part of an area in a screw (1) engaged with a first roller threaded zone (201) has the same pitch, the same spiral lifting angle, and opposite spiral direction as the first roller threaded zone (201); alternatively, a part of an area in an outer sleeve (g) engaged with a second roller thread zone (b01) has the same pitch, the same spiral lifting angle, and opposite spiral direction as the second roller thread zone (b01). Thus, a constant output lead that is much smaller than the screw thread lead is achieved, expanding the application range of micro-lead differential planetary roller screws to the micro-lead field.

The invention provides a planetary roller screw transmission assembly. The planetary roller screw transmission assembly comprises a nut, a screw, a plurality of rollers, a retainer group and a friction elastic piece, the nut is provided with an axially penetrating inner hole, and the inner circumferential surface of the nut is provided with at least one annular groove section and at least one non-tooth-shaped section adjacent to the annular groove section. The screw rod is arranged in the inner hole in a penetrating mode and extends out of the nut. A plurality of rollers are arranged in an inner hole of the nut and arranged on the periphery of the screw in a surrounding mode, each roller is provided with at least one large-pitch-diameter section and at least one small-pitch-diameter section with a smooth face in the axial direction, the large-pitch-diameter sections are provided with annular teeth used for being meshed with the screw in a rolling mode, and the small-pitch-diameter sections are provided with annular teeth used for being meshed with the nut in a rolling mode. The retainer group is arranged at the axial end parts of the plurality of rollers. The friction elastic piece is arranged on the non-tooth-shaped section of the inner circumferential face of the nut and makes interference contact with the smooth face of the small-pitch-diameter section of the multiple pin rollers.

The invention discloses a planetary roller screw multi-dimensional detection device based on bearing and wear characteristics, and relates to the technical field of planetary roller screw detection, the planetary roller screw multi-dimensional detection device comprises a device main body, a turntable and a mounting seat, the bottom end of the mounting seat is movably provided with a telescopic column, and the bottom end of the telescopic column is provided with a mounting hole; a plurality of sets of mounting blocks are symmetrically mounted in the mounting hole, sensing devices are arranged in the multiple sets of mounting blocks, two sets of movable columns are movably mounted in the mounting hole, movable heads are mounted at one ends of the two sets of movable columns, and limiting rods are symmetrically mounted on the outer walls of the two sets of movable columns. By arranging the mounting base, the telescopic column, the movable columns and the movable heads, the telescopic column moves downwards, one end of the telescopic column enters the threaded groove in the outer wall of the lead screw, the two movable heads are connected with the inner walls of the two sides of the threaded groove correspondingly, and the sensing device reads the distance between the two movable columns; the detection cost and convenience of screw thread pitch detection are reduced, and the requirement for workers is reduced.

The invention discloses a roller screw milling forming device with an anti-deviation function, and relates to the technical field of milling machine tools, the milling device comprises a seating machine tool body, a sliding rail is arranged on the seating machine tool body, a machining table is slidably connected to the sliding rail, a milling main body is arranged in the machining table, an auxiliary closing frame is slidably connected to the seating machine tool body, and the auxiliary closing frame is slidably connected to the machining table. The auxiliary closing frame is fixedly connected with the machining table, a deviation rectifying frame and an adjusting frame are arranged on the auxiliary closing frame, the adjusting frame is slidably connected with the seating bed body and comprises an adjusting steering engine and an adjusting wedge column arranged on the adjusting steering engine, a compensation closing table is slidably connected into the auxiliary closing frame, and a compensation wedge column is arranged on the compensation closing table. And a speed measuring sensor corresponding to the speed measuring wheel is arranged in the auxiliary closing frame, the speed measuring sensor is electrically connected with the adjusting steering engine, and the functions of automatic correction machining of the lead screw and fine adjustment of the milling cutter are achieved.

A detection device for detecting a spindle displacement of a roller screw motor of a robot, characterized in that the roller screw motor comprises a motor stator, a motor rotor, an internal support structure, a motor housing, and a motor spindle, wherein the motor stator is fixedly connected to the internal support structure, wherein the motor housing encloses the internal support structure, wherein the motor rotor is movably connected to the internal support structure, wherein the motor rotor can rotate relative to the motor stator, wherein the motor rotor, when rotating, sets the motor spindle into a linear movement, wherein the detection device comprises a first gear, a second gear, a first magnetic encoder and a second magnetic encoder, wherein the first gear is fixedly connected to an end piece of the motor rotor, wherein the first gear rotates with the motor rotor, wherein the second gear is arranged on the motor housing, wherein the second gear is in engagement with the first gear, wherein the second gear is driven for rotation by the first gear; wherein the first magnetic encoder is arranged on the first gear to detect a first angle of the first gear; wherein the second magnetic encoder is arranged on the second gear to detect a second angle of the second gear; wherein the number of teeth of the first gear is not equal to the number of teeth of the second gear; and wherein the first angle, the second angle and the difference between the number of teeth of the first gear and the number of teeth of the second gear are used to determine the spindle displacement.

The invention relates to a floating type roller lead screw with stable lead and application, and relates to the technical field of planetary roller lead screws, the floating type roller lead screw comprises a nut, a lead screw and a plurality of planetary rollers, the planetary rollers are annularly arranged around the lead screw, the nut is arranged on the outer sides of the planetary rollers in a sleeving mode, the planetary rollers are in threaded fit with the nut and the lead screw respectively, and the lead screw is in threaded fit with the nut. The nut and the lead screw are the same in thread turning direction and thread number, so that the lead of the floating type roller lead screw is irrelevant to the middle diameter of the lead screw and the middle diameter of the nut. The lead precision of the floating type roller screw cannot be influenced by the change of the middle diameter of the lead screw and the middle diameter of the nut due to abrasion, so that the floating type roller screw does not need to adjust the zero position again at set intervals, the lead is stable, and the floating type roller screw can be used continuously.

The invention discloses a device for detecting the rolling-sliding ratio of a planetary roller lead screw pair. The device comprises a roller simulation part and a columnar lead screw simulation part, a circular truncated cone is processed at one end of the lead screw simulation part, and the side surface of the circular truncated cone is a lead screw tooth-shaped contour surface; the roller simulation part comprises a roller thread section simulation circular ring; a pin roller thread simulation surface is arranged between the outer circumferential surface of the pin roller thread section simulation circular ring and each of the two end surfaces of the pin roller thread section simulation circular ring, and an included angle beta formed between each pin roller thread simulation surface and the outer circumferential surface is greater than 90 degrees and less than 180 degrees. The device provided by the invention can simulate the friction state and the rolling-sliding ratio of the contact position of the pin roller and the lead screw in the star pin roller lead screw pair, and allows the detection of the friction wear conditions of lead screws and pin rollers made of different materials through the arrangement of the replaceable pin roller threaded section simulation circular ring and the lead screw simulation part.

A high-speed roller screw testing device comprises a lathe bed, a power assembly for providing power for a roller screw is arranged on the lathe bed, the end portion of the roller screw is connected with a screw nut, the end portion of the screw nut is connected with a loading mechanism for providing load for the roller screw, and a connecting mechanism is arranged between the roller screw and the loading mechanism. The power assembly comprises a power motor and a diaphragm coupling arranged on a roller screw. Compared with the prior art, the brake and the loading roller screw in the loading mechanism are used for providing load for the roller screw, and the pneumatic control system is used for adjusting the air pressure of the brake, so that the accurate control of the loading torque is realized, the roller screw realizes passive loading, the response speed is high, and the loading precision is high. According to the utility model, positive and negative rotation loading force loading of the roller screw can be rapidly realized, and meanwhile, the diaphragm coupling can provide gapless transmission and is gapless and impact-free during reverse loading, so that continuous positive and negative rotation testing is realized, the testing efficiency is improved, and the labor cost is reduced.