6581 results about "Ball (bearing)" patented technology

The invention belongs to the technical field of numerical control machine tool control, and discloses a deep groove ball bearing ring grinding error compensation method and system, and the method comprises the steps: monitoring the temperature of a numerical control grinding machine body and a main shaft in real time through a plurality of temperature sensors, and obtaining the temperature field distribution data of a numerical control grinding machine; according to the numerical control grinding machine temperature field distribution data, the temperature gradient of each temperature measurement position is calculated; comparing each temperature gradient obtained by calculation with a preset temperature gradient threshold value, and judging whether a temperature measurement position with the temperature gradient exceeding the temperature gradient threshold value exists or not; when the temperature measurement positions with the temperature gradients exceeding the temperature gradient threshold exist, error compensation parameters of the numerical control system are determined according to the temperature gradients of all the temperature measurement positions, and the grinding machining track and grinding parameters are corrected; therefore, the grinding precision of the deep groove ball bearing ring can be improved.

The invention relates to the technical field of bearings, and discloses a ceramic angular contact ball bearing with high bearing capacity, the ceramic angular contact ball bearing comprises an outer ring, an inner ring, a rolling body, a retainer and an oil storage cavity, the outer ring is of a cylindrical structure, and the inner surface of the outer ring is in contact with the rolling body; the inner ring is positioned inside the outer ring, and the outer surface of the inner ring is contacted with the rolling body; and the rolling bodies are a plurality of spherical ceramic elements which are fixed and separated by the retainer. By optimizing the arrangement mode and material selection of the rolling bodies, the bearing has higher bearing capacity and anti-overturning performance under the high-load condition; the heat dissipation through holes are formed in the retainer, so that the heat dissipation performance of the bearing in the running process is remarkably improved, and the bearing failure risk caused by overheating is reduced; through the design of the oil storage cavity and the oil outlet micropores matched with the oil storage cavity, uniform supply of lubricating oil is achieved, and friction loss between the rolling body and the inner ring and the outer ring is reduced.

The invention discloses a gap-controllable retainer and a frictional resistance measuring method thereof, belongs to the technical field of mechanical equipment manufacturing, and solves the problem that an existing device can only test a retainer with a fixed gap and cannot simulate the influence of dynamic gap change on bearing performance. The retainer capable of controlling the gap comprises a retainer body capable of adjusting the gap between the retainer body and a rolling body, a retainer moving assembly and a gap adjusting part. The gap adjusting part comprises an adjusting motor, an eccentric wheel and a motor fixing frame. According to the retainer capable of controlling the gap, the gap between the retainer and a rolling body can be dynamically adjusted, the retainer can be matched with different types of ball-disc testing machines (rotary type and linear contact type) for friction resistance measurement, the gap between the rolling body and a pocket of the retainer can be flexibly adjusted by adjusting the motor and the eccentric wheel, and the friction resistance of the rolling body is measured. And therefore, the retainer main body can meet the retaining and limiting requirements of different working conditions and different types of bearings, and the performance, the service life and the reliability of the bearings are remarkably improved.

The invention discloses an on-line oil liquid detection system and method for cement ball milling, and relates to the technical field of industrial equipment state monitoring and fault diagnosis, the system comprises a data acquisition module, a data processing module, a data processing module and a data processing module, the data acquisition module adopts a multi-channel vibration sensor array to perform synchronous data acquisition on positions of a ball mill bearing seat, a gear box and a transmission shaft; an original vibration signal matrix containing multi-component coupling information is obtained through high-frequency sampling, if the sampling frequency is lower than ten times of the wear characteristic frequency, sampling parameters are automatically adjusted until the Nyquist theorem requirement is met, and the fault early warning and model self-adaption module adapts to the change of the equipment operation condition by updating the model parameters in real time; according to the online oil detection system and method for the cement ball mill, the equipment operation reliability and maintenance efficiency are effectively improved, the service life is prolonged, the maintenance cost is reduced, and data support is provided for preventive maintenance decision making of the ball mill.

An aircraft pipework assembly is disclosed including an aircraft structure; pipework; a fixture arrangement between the pipework and the aircraft structure; a tie rod connecting the pipework to the aircraft structure; a first tie rod bearing which connects the tie rod to the pipework; and a second tie rod bearing which connects the tie rod to the aircraft structure. The fixture arrangement includes a spherical bearing, the spherical bearing comprising a ball mounted to the pipework, and a housing coupled to the aircraft structure. The ball includes a convex spherical bearing surface; and the housing comprises a concave spherical bearing surface which mates with the convex spherical bearing surface of the ball. The fixture arrangement is configured to enable the pipework to translate relative to the ball in an axial direction aligned with a longitudinal axis of the pipework.

The invention discloses a lifting device for an elevator car. The lifting device comprises a screw rod, a bearing base and a limiting top plate, wherein the elevator car is arranged between the bearing base and the limiting top plate, the bearing base is provided with a ball sleeve and a driving device used for driving the ball sleeve to rotate, and auxiliary supporting columns are arranged belowthe bearing base; the bearing base comprises a base, a bottom plate and an arc-shaped plate, wherein the arc-shaped plate is hinged to the bottom plate, the base is provided with a fixing groove, thebottom of the fixing groove is provided with through holes, and the auxiliary supporting columns pass through the through holes to temporarily support the bottom plate; and the driving device drives the ball sleeve to rotate, so that the bearing base is lifted along the screw rod, the bottom plate is gradually separated from the support of the auxiliary supporting columns, and the bottom plate andthe arc-shaped plate are pressed into the fixing groove through the elevator car under the guide of the arc-shaped plate. According to the lifting device, the elevator car is convenient and fast to install, and the elevator car can be easily replaced in the later period.

The utility model relates to the technical field of bearing fitting equipment, in particular to full ball angular contact ball bearing fitting equipment which comprises a workbench, supporting columns fixedly sleeve four corners of the workbench, the bottoms of the supporting columns penetrate through the workbench and extend to the lower portion of the workbench, the tops of the supporting columns are connected with a supporting plate, a bearing seat is detachably embedded in the workbench, and the bearing seat is connected with the workbench. A center hole is formed in the bearing seat, the center hole is a three-section type stepped hole with the small middle and the two large ends, the center hole comprises a first stepped hole, a second stepped hole and a third stepped hole, a core shaft is movably arranged in the center hole, an inner ring containing boss is fixedly installed at the top of the core shaft, and an outer ring containing position is formed between the core shaft and the first stepped hole. The mandrel is in sliding fit with the second stepped hole, an elastic supporting assembly is arranged in the third stepped hole, and a pressing assembly is arranged on the supporting plate. The assembling device is simple in structure, convenient to operate, low in manufacturing cost, high in assembling efficiency and high in assembling quality.

The present invention relates to a bearing ball inspection system configured for automated non-destructive testing of spherical components. In an exemplary embodiment, a bearing ball is delivered to an inspection point by a rail guide and supported by a positioning wheel configured to rotate the bearing ball during imaging. Cameras capture images of different surface regions under controlled illumination provided by ultraviolet or white-light sources. A control system comprising a microprocessor and memory executes a machine learning model to analyze the images and detect surface defects without requiring manual interpretation. Based on the analysis, a sorting mechanism directs the bearing ball to a pass or fail location. The system further includes communication interfaces configured to transmit inspection results to a remote computing device and receive control instructions. This integrated architecture enhances inspection reliability, improves throughput, reduces inspection variability, and supports centralized management of inspection systems across distributed production sites.

A trailer jack and transport system providing improved rolling and steerable motion to sport, recreational and utility trailers, when operating on diverse kinds of ground surfaces, including pavement, dirt, sand, and mud, without use of caster-style wheels. The trailer jack and transport system employs a spherical load-bearing transport ball supported within a frame assembly and configured to allow the spherical wheel to freely rotate in any orientation, on ground surfaces of a diverse nature during system operation.

The invention relates to a recirculator (30) for a nut (12) of a ball screw mechanism (1), comprising an annular body (32) having a reference axis (300) intended to be aligned with a helical axis of the nut (12), the annular body (32) comprising a bearing surface (36), and a guide structure (34) arranged on the bearing surface (36), the bearing surface is configured to bear a nut (12) against the ball screw mechanism (1) in a bearing direction having an axial component parallel to the reference axis (300), the guide structure is configured to guide the balls in the circulation path opening at a first guide end (62) into a recirculation channel of the nut (12) and at a second guide end (72) onto a raceway (116) defined by a thread of the nut (12), characterized in that the bearing surface (36) lies at least partially in a cross-sectional plane (130) intersecting the recirculation path and perpendicular to the reference axis (300).

The invention belongs to the technical field of robot and intelligent equipment driving, and discloses an integrated servo push rod and a control method.A push rod module is integrally designed, and a high-density motor, a ball push rod and a band-type brake are arranged in the push rod module. The invention has the characteristics of high power density, small volume, high precision, high response speed, low noise, long service life, high reliability and the like. The inside of the push rod is contacted with the deep groove ball bearing at the tail end of the screw rod through the ball retainer, and the outside is contacted with the oil-free bushing, so that the lateral strength of the push rod is improved, friction is reduced, and operation efficiency is improved. A linear encoder is arranged at the end of the screw rod, accurate control of the tail end can be achieved, a magnetic encoder is arranged at the tail end of the motor, input and output end double-closed-loop can be achieved, precision can be improved, and errors of band-type brake in power-off response time can be compensated; the lead screw is connected with the motor through the diaphragm coupling in the motor, so that the axial space is saved, and the service life of the motor is prolonged.

The utility model relates to the technical field of bottle-making machine turnover, and discloses a turnover device for a bottle-making machine, which comprises a first vertical plate, a right end belt of the first vertical plate is connected with a conveyor belt, a right end belt of the conveyor belt is connected with a second vertical plate, and the bottom of the second vertical plate is fixedly connected with a support frame; the two ball supporting plates are distributed in a bilateral symmetry mode with the conveying belt as the center, connected to the transmission lead screw through threads and capable of sliding in the adjusting stand columns and the distance adjusting grooves, and the structure enables the ball supporting plates to achieve accurate lifting motion under driving of the lifting motor and the transmission lead screw. The first overturning clamp and the second overturning clamp which are located on the ball supporting plate achieve clamping, overturning and other operations on objects on the conveying belt through the air cylinder, the bearing and the overturning motor respectively, the first overturning clamp and the second overturning clamp are located at the top of the conveying belt, and the objects on the conveying belt can be conveniently machined.

The invention relates to the technical field of aero-engine rotor vibration tests, in particular to an aero-engine rotor unsteady-state thermally induced vibration test system which comprises a rotor experiment table, an air inlet and exhaust system, a lubricating oil system, a protection system and a heating system. The rotor experiment table comprises a first supporting system, a second supporting system, a rotor outer protection casing, a gas compressor disc, a gas compressor sealing disc, a turbine disc, a turbine front sealing disc, a front shaft diameter, an inter-disc drum, a rear shaft diameter, a first squirrel-cage elastic support, a ball bearing, a second squirrel-cage elastic support and a rolling rod bearing. The first supporting system is composed of a first squirrel-cage type elastic support and a ball bearing, meanwhile, an air inlet is formed in the first supporting system, and the ball bearing in the first supporting system is connected with the front shaft diameter in an interference fit mode. Rotor unsteady-state characteristics considering heating conditions are finally created, and vibration response and durability of a wheel disc structure under the unsteady-state thermal load condition are studied in combination with test conditions such as temperature vibration and the like.

The invention provides a ball bearing clearance measuring tool for a bulb tube, a ball bearing to be measured comprises a bearing body, a bearing outer ring and a rolling body, and the measuring tool comprises a support; the bearing support is provided with a bearing containing cavity used for containing the ball bearing, and the bearing outer ring is tightly pressed in the bearing containing cavity. The limiting mechanism is used for limiting the bearing outer ring to move relative to the bearing support in the axial direction of the ball bearing; the rotating mechanism is used for driving the support to rotate and further driving the bearing support to turn over by 180 degrees in the vertical direction, so that the ball bearing is switched between a first limit position and a second limit position, and the axial direction of the ball bearing is in the vertical direction at the first limit position and the second limit position; at the first limit position and the second limit position, the measuring mechanism respectively measures a first numerical value and a second numerical value representing the relative displacement of the bearing body and the bearing outer ring, and the first numerical value and the second numerical value are used for determining the axial clearance of the ball bearing. According to the scheme, the axial clearance measurement accuracy can be improved.

A layered fertilizer applicator capable of penetrating into soil for forestry cultivation relates to the technical field of agriculture and is characterized in that a lifting plate is slidably arranged on the front side of a cart through a slide rail pair, an electric telescopic rod is fixedly arranged at the upper part of the cart, one end of the electric telescopic rod is connected with the lifting plate, and a driving box is fixedly arranged on the front side wall of the lifting plate; the upper end of the vertical pipe is connected with the fertilizer storage box through a material conveying hose, three driving cylinders are rotationally connected into the driving box through bearings, a worm meshed with the three worm wheels is fixedly arranged on an output shaft of the motor, and one end of the worm is rotationally connected with the inner wall of the driving box through a bearing; the rotating cylinders are rotationally arranged at the bottom of the driving box through thrust ball bearings, the upper ends of the rotating rods movably penetrate through the rotating cylinders and the driving cylinders and then are movably inserted into the vertical pipes, and the three rotating rods are fixedly sleeved with the spiral cutters correspondingly, so that layered fertilization can be achieved by going deep into soil, and the fertilization effect is improved; and the soil fertilization depth can be adjusted according to fertilization requirements.

The utility model discloses a sealing type slewing bearing which comprises an inner ring and an outer ring which are arranged from inside to outside, a plurality of balls are arranged between the inner ring and the outer ring, the end face of the inner ring is higher than the end face of the outer ring, a sealing ring is arranged on the side face of the inner ring, and the inner ring and the outer ring are arranged in parallel. An annular protrusion is formed on the lower end face of the sealing ring, the end face of the outer ring is sunken downwards to form an annular groove, the annular protrusion is rotatably clamped in the annular groove, a gap exists between the lower end face of the sealing ring and the end face of the outer ring, and a rubber ring with a U-shaped section is detachably arranged at the end of the sealing ring. The problems that in the prior art, a rubber ring is arranged on the surface of a slewing bearing, one end of the rubber ring is clamped to the side face of an inner ring, the other end of the rubber ring is attached to the end face of an outer ring, after long-time use, the elasticity of the sealing rubber ring is reduced, the end of the rubber ring is prone to upwarp, and the sealing performance is reduced are solved.

A moving part of the short flexible cylinder active complex parallel radial harmonic transmission is composed of a thin-wall composite short flexible cylinder and two rolling wave generators with roller pins or ball-retainer assemblies. A flexible bearing low-speed moving ring raceway is integrated on one side of the gear, and a full-cylinder-length gear is arranged on the other side of the gear; the two semi-short shafts are fixedly connected to the two ends of a motor rotor respectively, are integrated with flexible bearing high-speed moving ring raceways and are the same in structure size, and a semi-short shaft at one end needs to be coplanar with a semi-long shaft at the other end, so that the two ends of the semi-short shafts generate time-varying radial antisymmetric deformation; the static part is composed of end covers which are fixedly connected to the two ends of the motor stator and provided with rigid gears. A double-convex-arc raceway of a high-speed moving ring of the flexible needle bearing is designed, a convexity needle roller with the middle concave structure dynamically constraining the axial movement amount of a short flexible cylinder and a retainer and various structures facilitating rolling body assembly are used, and a waveform raceway calculation formula of a wave generator for the needle roller is given; therefore, the radial size and the axial size of the active complex radial harmonic transmission can be reduced on the basis of ensuring the transmission precision and the bearing capacity.

The invention belongs to the technical field of tower foot manufacturing, and relates to an automatic clamping device and method for a power tower foot. In the automatic clamping device, a clamping mechanism comprises two right-hand and left-hand trapezoidal lead screws, clamping jaws are movably installed on the right-hand and left-hand trapezoidal lead screws and located on the same horizontal plane, a driving mechanism comprises a driving motor and a cog belt assembly, a rotating shaft of the driving motor is connected with the cog belt assembly, and the cog belt assembly is in meshing transmission connection with the right-hand and left-hand trapezoidal lead screws. According to the automatic clamping method, the inclination angle of the clamping jaws is adjusted to be matched with the shape of a workpiece, the rotating shaft of the driving motor rotates forwards to control the forward and reverse thread trapezoidal lead screw to rotate, the clamping jaws automatically center and clamp the workpiece for welding, the rotating shaft of the driving motor rotates backwards after welding is completed, and the clamping jaws move outwards to loosen the workpiece. The clamping jaw can be controlled to automatically center and clamp a power tower foot workpiece, and the clamping accuracy is improved; and during feeding, balls of the bull eye bearings make contact with the workpieces, and the feeding and discharging efficiency of the workpieces is improved.

A muzzle device for a firearm may include a device body and a plurality of ball bearings. The device body may be configured to be removably secured to a mount body of a mount configured to be secured to a barrel of the firearm, the mount body including a plurality of lugs each extending radially outward relative to a longitudinal axis of the mount and including a stop and a detent. The device body may include a plurality of protrusions each extending radially inward relative to a longitudinal axis of the muzzle device and configured to engage the stop of a respective lug of the mount to prevent rotation of the muzzle device relative to the mount in a first direction. The ball bearings each may be configured to move relative to the device body and to engage the detent of a respective lug of the mount to inhibit rotation of the muzzle device relative to the mount in a second direction opposite the first direction.

The invention relates to the technical field of wind power foundations, in particular to a wind power foundation and a construction method thereof. Comprising a base and four concrete pile foundations, a hydraulic column is installed at the top end of each concrete pile foundation, an expansion supporting piece is arranged on each concrete pile foundation, the movable end of each hydraulic column is hinged to the base, a universal ball seat is embedded in the center of the base, a foundation column is installed on the top face of the universal ball seat, and a limiting disc is installed at the bottom of the foundation column; a set of limiting springs are installed between the limiting disc and the base, the base column is slidably sleeved with a universal sliding sleeve, the top and the bottom of the universal sliding sleeve are each provided with a turbulent flow device, a lantern ring is embedded in the universal sliding sleeve, four universal hinge joints are embedded in the lantern ring, and four hydraulic push rods are hinged to the base. According to the invention, a wind-resistant stable system which takes an electric control system as a core and is deeply linked with the hydraulic push rod, the universal sliding sleeve and the turbulent flow device is constructed, and the technical breakthrough from passive bearing to active counteracting is realized.

The invention discloses a high-torque-density magnetic harmonic deceleration axial permanent magnet servo motor, and an axial magnetic field modulation type motor comprises a stator, a motor left rotor, a motor right rotor, a permanent magnet and an armature winding. The radial magnetic harmonic reducer comprises a magnetic harmonic reducer stator, a magnetic harmonic reducer outer rotor, a magnetic harmonic reducer inner rotor, a permanent magnet and a ball bearing. Through the integrated structure of the magnetic harmonic reducer stator and the magnetic field modulation type motor stator, the magnetic harmonic reducer and the magnetic field modulation type motor are directly connected, a mechanical reducer structure of a traditional servo system is omitted, and the overall weight of the servo system is effectively reduced. The magnetic field modulation type motor adopts an axial structure so as to improve the torque density of the servo system. The magnetic harmonic reducer is embedded in a hollow position in the magnetic field modulation type motor by adopting a radial structure, so that the design of a light-weight high-integration servo system is realized. The magnetic field modulation type motor and the magnetic harmonic reducer both adopt a surface-mounted permanent magnet structure so as to reduce torque pulsation.

A muzzle device for a firearm may include a device body and a plurality of ball bearings. The device body may be configured to be removably secured to a mount body of a mount configured to be secured to a barrel of the firearm, the mount body including a plurality of lugs each extending radially outward relative to a longitudinal axis of the mount and including a stop and a detent. The device body may include a plurality of protrusions each extending radially inward relative to a longitudinal axis of the muzzle device and configured to engage the stop of a respective lug of the mount to prevent rotation of the muzzle device relative to the mount in a first direction. The ball bearings each may be configured to move relative to the device body and to engage the detent of a respective lug of the mount to inhibit rotation of the muzzle device relative to the mount in a second direction opposite the first direction.

A gear motor includes an electric motor and a gearbox. The electric motor has a stator housing, a rotor shaft, and a first bearing for mounting the rotor shaft. A coupling sleeve is fitted onto the rotor shaft and is connected to the rotor shaft for conjoint rotation. An inner ring of a second bearing, e.g., a roller bearing, a ball bearing, etc., is fitted onto the coupling sleeve, and the outer ring of the second bearing is accommodated in an adapter ring which is connected to a housing part of the gearbox for conjoint rotation. The adapter ring is connected, on the side thereof facing away from the housing part, to an annular circular flange which is connected, on the side thereof facing away from the adapter ring, to a circular flange connected to the stator housing.

The invention relates to a piston type rotary supporting device and a control method, and belongs to the technical field of coal mine robot automation. The device comprises a rear end cover, a transmission body piston, a cylinder barrel, an output connecting disc, a front flange and a ball. The rear end cover is matched with a special-shaped hole of the transmission body piston through a special-shaped guide shaft, and axial sliding and circumferential rotation stopping of the piston are achieved. A spiral groove of the transmission body piston is meshed with a multi-head thread of the output connecting disc, so that linear motion is converted into rotary motion; the cylinder barrel and the front and rear end covers form a sealed hydraulic cavity, and the piston is driven by hydraulic oil to reciprocate. According to the control method, positive and negative rotation and speed adjustment of the output connecting disc are achieved by adjusting hydraulic flow. According to the scheme, the high bearing capacity is achieved through hydraulic driving, the speed reducing mechanism is simplified through the spiral transmission structure, the friction resistance is reduced through the balls and the roller paths, and the robot joint is suitable for the severe environment of an underground coal mine and meets the 0-360-degree precise rotation requirement.

The utility model discloses an automatic filling device for bearing balls. The automatic filling device comprises a base, a conveying belt, a bearing plate and a ball containing bin, wherein the base is used for bearing; the conveying belt is mounted on the inner side of the upper end of the base in a flush manner; an anti-deviation limiting structure is arranged on the upper side of the right end of the base, the anti-deviation limiting structure comprises a bearing plate, a limiting plate, an adjusting rod, a monitoring head, a first electric telescopic rod and a limiting rod, and the bearing plate is fixedly connected to the upper side of the right end of the base; the front side and the rear side of the bead containing bin are fixedly connected with a front connecting plate and a rear connecting plate correspondingly, and the front connecting plate and the rear connecting plate are fixedly connected to the upper sides of the front end and the rear end of the base correspondingly. According to the automatic bearing ball filling device, conveying of a bearing ring to be filled is conveniently controlled, a bearing outer ring to be filled is conveniently limited, the right end of an inner ring is conveniently attached to the inner side of the right end of the outer ring, ball filling in the later period is facilitated, and the number of filled balls is conveniently and accurately controlled.

A liftable and rotatable jigsaw puzzle table includes a jigsaw bottom plate, a center member provided on the bottom of the jigsaw bottom plate, a sleeve installed in the middle of the center member, a fixed member rotatably installed at bottom of the jigsaw bottom plate, a sleeve rod provided within the sleeve and installed on the top of the fixed member, a ball bearing rotatably provided on the bottom of the sleeve, an annular groove provided at the center member, a plurality of positioning holes evenly provided in the annular groove, a positioning cylinder installed on the fixed member, a positioning rod slidably provided in the positioning cylinder, a top pressure spring installed on the positioning rod, a top pipe at the bottom of the fixed member, a bottom pipe sleeved on the top pipe, and a gas spring in the top pipe and bottom pipe.

The invention relates to the technical field of neodymium-iron-boron powder ball milling, and discloses a neodymium-iron-boron powder ball milling cavity assembly based on cavity variable-diameter gradient grinding, the neodymium-iron-boron powder ball milling cavity assembly comprises a grinding part, the grinding part comprises a fixed seat, and the fixed seat is rotatably connected with a ball milling cylinder through a bearing seat arranged on the upper surface of the fixed seat. The neodymium-iron-boron powder ball-milling cavity assembly based on cavity variable-diameter gradient grinding can effectively solve the problems that in the prior art, neodymium-iron-boron powder grinding needs to be different in different stages during ball milling, large-particle raw materials need to be crushed through large impact force in the initial stage, the mild and fine grinding effect is needed along with grinding, and the grinding efficiency is poor. The problems that due to excessive grinding, particle aggregation or crystal structure damage is caused, and the magnetism and other performance of neodymium iron boron powder are affected are solved, however, an existing ball mill usually adopts a single grinding mode, the grinding strength and mode cannot be automatically adjusted according to the change of the material granularity, and gradient change from coarse grinding to fine grinding is difficult to achieve are solved.

An electric powered steering assembly for a commercial vehicle includes a housing. An interior wall of a cylindrical portion of the housing defines a groove that extends in an axial direction, the groove having inwardly tapered walls. A ball screw is disposed in the housing and defines a hole extending in a radial direction. A ball nut disposed in the housing, surrounding the ball screw, rotates relative to the housing. An anti-rotational pin having a tapered end is disposed in the hole, the tapered end having tapered surfaces corresponding to the inwardly tapered walls. A bearing material is disposed on tapered surfaces of the tapered end. A spring is disposed in the hole and biases the anti-rotational pin in a radially outward direction towards the groove so that the tapered end of the anti-rotational pin engages the groove and restricts rotation of the ball screw relative to the housing.

The invention relates to the technical field of welding equipment, and discloses welding equipment for fixing automobile shock absorber parts, which comprises a base, a fixing frame is fixedly mounted at the top of the base, a supporting plate is fixedly mounted on one side of the fixing frame, a rotating ring is rotatably mounted on the supporting plate, and a driving assembly is arranged at the bottom of the supporting plate. Through cooperation of the conical grooves and the balls, the clamping plates and the right-angle triangular plates are driven to synchronously get close to the hollow outer cylinder, the bevel edges of the four right-angle triangular plates form uniform and symmetrical clamping force, the hollow outer cylinder can be firmly fixed, the right-angle triangular plates can adjust the distance in a self-adaptive mode according to the diameter of the hollow outer cylinder, and the clamping requirements of parts of different specifications are met; the clamping force is always kept uniform, the pressing plate is matched to drive the upper rotating disc to descend to achieve longitudinal limiting, bidirectional fixing is formed through horizontal clamping of the right-angle triangular plate, the problems of unstable clamping and easy loosening are avoided, a foundation is laid for subsequent precise welding, and the welding seam forming quality is guaranteed.

The invention discloses a high-sealing long-service-life automobile hub bearing, and belongs to the technical field of bearings, the high-sealing long-service-life automobile hub bearing comprises an inner ring body fixedly mounted on a shaft, an outer ring body is arranged on the outer side of the inner ring body, balls are arranged between the inner ring body and the outer ring body, and the outer sides of the balls are positioned through retainers; preset holes are formed in the two sides of the inner ring body and the two sides of the outer ring body, oil storage assemblies which are driven by heat to achieve automatic oil supplementing are fixedly installed on the inner sides of the preset holes, sealing pieces are fixedly installed at the two ends of the inner ring body, and first sealing rubber bodies used for adjusting and conveying oil are fixedly bonded to the outer sides of the sealing pieces. And second sealing rubber bodies are fixedly mounted at the two ends of the outer ring body. According to the automobile hub bearing with the high sealing performance and the long service life, different sealing modes can be adopted when an automobile runs and stops, the sealing dustproof effect at the position of the bearing is effectively improved, and oil liquid can be added in a self-adaptive mode in the using process.