346 results about "Needle roller bearing" patented technology

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 relates to the technical field of cross shafts, and discloses an efficient lubricating needle bearing cross shaft which comprises a cross center part, a first oil injection assembly is arranged on the cross center part, a second oil injection assembly is arranged in the cross center part, and the first oil injection assembly comprises an oil injection nozzle. A first oil cavity is formed in the cross-shaped center part, and a first oil injection groove is formed in the cross-shaped center part. According to the efficient lubricating needle bearing cross shaft, a grease gun is used, an oil outlet of the grease gun is tightly pressed on an oil injection nozzle, it is ensured that lubricating oil enters a first oil cavity through the oil injection nozzle under the pressure effect, and a first sealing plate and a first spring move downwards to the position below a communicating hole channel under the pressure effect; and meanwhile, after the second oil cavity is filled with the lubricating oil, the first oil cavity is slowly filled with the lubricating oil, the lubricating oil flows out of the first oil injection groove, and primary oil injection can be achieved.

The high-precision grinding machining method for the needle bearing comprises the steps that S1, a needle bearing ring to be ground is placed on a mounting table of a three-dimensional fine adjustment mechanism through a mechanical arm, a ring clamp is started to conduct rigid positioning on the needle bearing ring, and a tool setting gauge scans the needle bearing ring; s2, the numerical control bearing grinding machine drives a grinding wheel to machine and grind the inner ring of the needle bearing ring, a temperature detection module detects the temperature change, and a visual detection module scans the inner diameter data of the needle bearing ring in real time; and S3, the grinding wheel is dynamically adjusted according to the grinding wheel feeding correction control instruction obtained through scanning of the visual detection module, and the feeding rate is finely adjusted. The inner diameter data of the ferrule is scanned in real time through the visual detection module, grinding thermal deformation is monitored in real time in combination with the temperature detection module, a whole-process closed loop of detection-analysis-correction of machining errors is achieved, 10-30 min delay of traditional off-line detection is shortened to millisecond response, and the purpose of high-precision machining is achieved.

The invention relates to the technical field of needling machine equipment, in particular to a needling device suitable for a special-shaped composite material preform, which comprises a mounting seat, a speed reducing motor is connected to the mounting seat, the output end of the speed reducing motor is connected with a rotating shaft, the rotating shaft is connected with an eccentric through hole of an eccentric wheel, and the eccentric wheel is rotatably connected in a cylindrical needle bearing; the cylindrical needle bearing is inserted into a second through hole in the end of the push plate, the push plate is in sliding fit with the mounting base, the other end of the push plate is connected with the quick-change needle row, the other end of the quick-change needle row faces the tool, the bottom of the mounting base is connected with the horizontal moving part, and the quick-change needle row is adjusted to face the normal direction of a prefabricated body and conducts needling on the prefabricated body. The surface of the R-angle prefabricated body and the surface of the conical prefabricated body can be needled, and then the purpose of tight combination of fibers in the prefabricated body is achieved.

The speed reducer gear shifting shaft structure comprises a gear shifting shaft, a gear shifting gear, a needle roller thrust bearing, a pre-tightening assembly, a sliding sleeve and a gear shifting fork, the gear shifting gear, the sliding sleeve and the pre-tightening assembly are arranged on the gear shifting shaft, the gear shifting gear is arranged on the gear shifting shaft through the needle roller thrust bearing, and the pre-tightening assembly is arranged on the gear shifting shaft through the sliding sleeve. The pre-tightening assemblies make contact with the gear shifting gears correspondingly, and thrust of the gear shifting gears is pre-tightened through the pre-tightening assemblies. Sliding friction of the end face of the gear shifting gear is converted into rolling friction through the needle roller thrust bearing, and end face abrasion is greatly reduced. And due to the constant pre-tightening force, early failure caused by too tight or too loose bearings is avoided, the reliability of the speed reducer is remarkably improved, and the service life of the speed reducer is remarkably prolonged.

The invention relates to the technical field of punching outer ring needle roller bearing processing, in particular to a punching outer ring needle roller bearing one-time needle mounting detection machine which comprises a rack, a retainer feeding mechanism, a needle mounting workbench, a needle mounting mechanism, a transfer mechanism, a punching outer ring feeding mechanism, a punching outer ring assembling workbench and a discharging mechanism, and the retainer feeding mechanism, the needle mounting workbench, the needle mounting mechanism, the transfer mechanism, the punching outer ring feeding mechanism, the punching outer ring assembling workbench and the discharging mechanism are arranged on the rack. The needle mounting workbench comprises a rotating disc, a rotating disc driving assembly for driving the rotating disc to rotate and a plurality of rotating edge searching type jacking tools which are arranged on the rotating disc and can achieve positioning of the holder. According to the one-time needle mounting detector for the punched outer ring needle roller bearing, the specially designed rotary edge searching type jacking tool is matched with all the mechanisms, the assembly efficiency of the punched outer ring needle roller bearing is greatly improved, meanwhile, in the assembly process, the needle roller can be prevented from being disengaged from the interior of the retainer, the yield is greatly improved, and therefore the product quality is guaranteed, and the production cost is reduced. And the production cost is reduced.

The invention belongs to the field of uncontained bearing load calculation, and discloses a load calculation method for a civil aircraft flap needle roller bearing. On the basis of the Hertz contact theory, a bearing outer ring is regarded as a flexible outer ring, the influence of bending elastic deformation of the bearing outer ring under an external load on load distribution is considered, a comprehensive deformation calculation formula between a roller pin and a roller path is established, then the roller pin is subjected to slicing discretization treatment along the axis of the needle roller bearing, and according to the obtained deformation, the bearing outer ring is subjected to deformation calculation; the contact load generated between the slice unit and the inner and outer raceways is calculated, then a static equation set of the flap needle bearing is established, the deformation amount of each position of the needle bearing is solved through a Levenberg-Marquardt algorithm, and the load distribution of the needle bearing can be calculated. On the basis, a relational expression among the maximum contact stress, the load and the displacement is established, and the maximum contact stress distribution of the needle bearing is obtained through a numerical iteration method.

The invention discloses a needle bearing surface strengthening treatment method, which relates to the field of needle bearings, and comprises the following steps: S1, a pretreatment stage; s2, surface strengthening core process: selecting a heavy-load working condition strengthening route or a precise / thin-wall bearing strengthening route according to the service working condition of the needle bearing; and S3, a post-treatment finishing stage. According to the method, multiple technologies such as heat treatment (carburizing and quenching and gas nitriding), mechanical strengthening (shot blasting) and surface coating (PVD-TiN and DLC) are systematically combined, and a multi-dimensional strengthening system is formed. All the processes cooperate with one another, so that the surface of the bearing has high hardness, fatigue resistance, low friction and corrosion resistance at the same time, the performance limitation of a single process is broken through, the comprehensive performance of the needle bearing is remarkably improved, meanwhile, a targeted strengthening scheme is customized according to different service conditions of the needle bearing, and the service life of the needle bearing is prolonged. And the high-performance requirements of the needle bearing under different working conditions are met.

The utility model relates to a double-saw-blade cutting machine for preparing a shaped refractory product sample. The double-saw-blade cutting machine comprises a saw blade, a saw blade transmission system, a spraying device, a sample carrying table and a track, the device further comprises a rack, a water collecting tank and a multi-sample clamp; the saw blade adopts a diamond saw blade, a needle bearing group is arranged between the saw blade transmission shaft and the bearing seat, and the track adopts a linear slide rail; the multi-sample clamp is provided with a V-shaped seat and a pressing plate, a sample is arranged in a V-shaped groove in the top of the V-shaped seat, and the top of the sample is fixed through the pressing plate. The problems that a guide rail of a refractory material cutting machine is prone to corrosion, stability is poor during saw blade cutting, cutting efficiency is low and the like are solved, a saw blade transmission shaft adopts a needle bearing, the radial size is small, load is high, movement is stable, the service life is long, a cutting machine track adopts a linear sliding rail, precision is high, corrosion is not prone to occurring, and maintenance is convenient; by adopting the multi-sample clamp, a plurality of samples can be fixed at multiple angles at one time, the operation is simple, and the sample preparation efficiency is greatly improved.

The utility model relates to bearing installation technical field, concretely is a kind of needle bearing mounting device, including installation device main body, the bottom four corners of installation device main body are evenly provided with support chassis, the front side of installation device main body is provided with temperature control screen, the top side of installation device main body is symmetrically provided with first mounting bracket and second mounting bracket, the top end swing joint of first mounting bracket has bearing heating rod, the top of second mounting bracket is provided with fixed rod, the position of fixed rod is opened with the limit slot of corresponding size in the bottom of the end of bearing heating rod far from first mounting bracket, temperature control screen and bearing heating rod electric connection, the inside of oil storage cavity is guided into the inside of oil outlet spray head by hose by hydraulic pump, the inside of oil outlet spray head is injected into bearing seat and installation shaft gap by butter, the inside of bearing is lubricated by butter, improve the service life of needle bearing also facilitate better installation to needle bearing.

The application discloses a silicon steel sheet laminating and pressing equipment based on self-control pressure and relates to the technical field of silicon steel sheet manufacturing equipment. The equipment comprises a C-shaped frame, a pressure conduction block and a double-acting hydraulic cylinder. A cross-shaped oil guide groove is milled at the bottom end of the outer wall of the pressure conduction block. Two rows of needle roller bearings are symmetrically installed on the side surface of the outer wall of the pressure conduction block. A laminating pressing plate is fixedly installed at the bottom end of the outer wall of the pressure conduction block. An annular oil cavity is formed at the top end of the outer wall of the laminating pressing plate. The annular oil cavity is communicated with the oil guide groove. A pressure sensing film is fixedly installed at the bottom end of the outer wall of the laminating pressing plate. A strain grid is etched at the rear end of the outer wall of the pressure sensing film. The strain grid etched at the pressure sensing film can sense the pressing pressure, the real-time detection and automatic closed-loop adjustment of the pressing pressure are realized, the problem that the pressure fluctuation of the pressing equipment is large and the laminates are deformed due to overpressure or loose due to insufficient pressure caused by the adjustment depending on manual experience is solved, and the compactness, flatness and core performance consistency of the laminates are improved.

The application provides a special tool for a flat top center, which can guarantee the positioning accuracy and stability of the top center and ensure the machining accuracy of the blade. The tool comprises a top center shaft, which is installed in a top center seat, the top center seat is installed in a mounting cavity of a machine tool slide cylinder, and the top center seat and the top center shaft are connected by screws, the shape of the mounting cavity of the machine tool slide cylinder is matched with the shape of the top center seat; the top center shaft comprises a shaft body and a top head, the top surface of the top head is a flat surface, and the top surface of the top head is fixedly installed with a tooth surface pressing block; the shaft body comprises three cylindrical sections with decreasing radii from top to bottom, namely a first cylindrical section, a second cylindrical section and a third cylindrical section, the outer part of the joint between the third cylindrical section and the top center seat is successively sleeved with a thrust ball bearing and a needle bearing from top to bottom; the outer part of the joint between the second cylindrical section and the top center seat is successively sleeved with a pair of angular contact ball bearings from top to bottom, the upper end surface of the outer ring of the upper angular contact ball bearing is press-fitted with an end cover, the end cover is sleeved on the outer part of the first cylindrical section, and a first sealing ring is arranged at the joint between the end cover and the first cylindrical section.

Provided is a shell type needle roller bearing having rocking durability. In this shell type needle roller bearing (10), a shell-shaped outer ring (1) is made from an austenitic stainless steel material, and the average crystal grain size in a region up to 0.135 mm from a surface of a raceway surface (1d) of the shell-shaped outer ring (1) is 22 μm or less .

The plunger assembly comprises a plunger, a spring pin and the needle roller bearing, the needle roller bearing comprises an outer ring and a needle roller, a shaft core is arranged in the center of the needle roller bearing, the needle roller is arranged between the shaft core and the outer ring, fixing grooves are formed in the two sides of the plunger, and the spring pin is arranged in the fixing grooves. The two sides of the shaft core are inserted into the fixing grooves, a spring pin is further arranged at one end of the shaft core, a needle bearing cavity for the needle bearing to be installed is formed in the plunger, when the needle bearing rotates at a high speed, a liquid dynamic pressure oil film is formed between the needle bearing and the needle bearing cavity, and the liquid dynamic pressure oil film provides supporting force for the needle bearing. The shaft core and the liquid dynamic pressure oil film jointly support the downward pressure of the needle bearing, and the needle bearing is characterized in that the liquid dynamic pressure oil film can provide supporting force, the liquid dynamic pressure oil film and the shaft core jointly bear the downward pressure of the needle bearing, frictional resistance is reduced, mechanical efficiency is improved, part abrasion is reduced, and meanwhile the supporting stability of the needle bearing is enhanced.

The invention relates to the technical field of automobile accessories, and discloses a high-supporting-performance separated steering intermediate shaft sheath which comprises an upper metal plate, a lower metal plate, a rubber pad and a needle bearing, the rubber pad penetrates through a hole of the lower metal plate through a rubber staple bolt structure to be clamped on the upper metal plate, and the needle bearing is assembled in a rubber ball head in an interference mode. The needle roller bearing comprises an elastic outer ring, a retainer, a needle roller and second lubricating grease, a bearing cover plate is fully coated with the grease and placed into a bearing ring, the bearing cover plate and the other bearing cover plate are connected in a clamped mode and installed in a rubber ball head in an interference fit mode, and the rubber ball head is in interference fit with an upper metal plate and a lower metal plate. According to the separated steering intermediate shaft sheath assembly, the metal plate is fixed to the automobile dash panel, the rubber pad is sealed with the dash panel, the needle bearing and the bearing ring are in interference fit with the automobile intermediate shaft, the rotating function of the intermediate shaft is achieved, and the steering intermediate shaft sheath with the high supporting performance has the advantages of being easy to assemble, economical, practical, dustproof, waterproof, high in supporting performance and the like. The rotation is smooth; and the supporting performance on the intermediate shaft is high.

The invention discloses an automatic assembly process of an assembled crankshaft. The process comprises the following steps: cleaning and drying a left half shaft, a right half shaft, a crank pin and a connecting rod; the connecting rod, the crank pin and the needle bearing are conveyed to a connecting rod assembly assembling station after being selected and matched, and connecting rod assembly assembling is conducted; the left half shaft is conveyed to a discharging position, and the right half shaft is conveyed to a woodruff key press-fitting station for woodruff key press-fitting and then conveyed to the discharging position; the left half shaft, the right half shaft and the connecting rod assembly are conveyed to a crank pin press-fitting station, crank pin press-fitting is conducted, and an assembled crankshaft is formed; the assembled crankshaft and the oil cover are conveyed to an oil cover press-fitting station, and oil cover press-fitting is conducted; the assembled crankshaft and the bearing are conveyed to a bearing press-fitting station for bearing press-fitting; the assembled crankshaft and the chain wheel are conveyed to a chain wheel press-fitting station, and chain wheel press-fitting and detection are conducted; the assembled crankshaft gear is conveyed to a gear press-fitting station to be subjected to gear press-fitting; the assembled crankshaft is detected after being straightened; and if the assembly type crankshaft is qualified, soaking the assembly type crankshaft with oil and then conveying the assembly type crankshaft to a storage frame, otherwise, conveying the assembly type crankshaft out of a production line.

The utility model relates to the technical field of textile machinery, in particular to a swing arm joint connecting assembly of a high-speed warp knitting machine. Comprising a bearing outer sleeve, a plurality of roller pins arranged in an inner cavity of the bearing outer sleeve, a steel sleeve and a connecting pin shaft fixedly connected with the steel sleeve, a cavity of the bearing outer sleeve comprises oil storage areas on the two sides, and the outer wall of the bearing outer sleeve is provided with an oil injection hole communicated with a needle roller area, so that the problems that grease leaks outwards, foreign matter permeates into a needle roller bearing and the like in traditional swing arm connection rotation are solved, the service life of the swing arm joint connecting piece of a machine is effectively prolonged, and the service life of the machine is prolonged. And meanwhile, maintenance is convenient, the operation stability of the machine can be ensured, greasy dirt permeating to grey cloth is reduced, and the effect of saving cost can be achieved.

The utility model provides a roller pin with a surface lubrication channel, which comprises a roller pin body, at least one lubrication channel with two open ends is arranged on the roller pin body, the lubrication channel is arranged along the radial direction of the roller pin body and penetrates through the center line of the roller pin body, and the cross section of the lubrication channel is circular. The lubricating channel with the openings at the two ends is arranged on the needle roller body, and lubricating oil can be temporarily stored in the lubricating channel and flows out from the openings at the two ends, so that the surface lubricating effect is achieved, and the friction force between the surface of the needle roller and the inner ring and the outer ring of the needle roller bearing is reduced; according to the structure of the lubricating channel, only two small holes need to be formed in the surface of the roller pin, the influence on the friction coefficient is small, and the surface friction force is basically not increased; in addition, if dirt exists in the bearing, the dirt can enter the lubricating channel and cannot stay on the surface of the needle roller, the influence of the dirt on the use of the needle roller bearing is avoided, and the service life of the needle roller bearing is prolonged.

The utility model discloses a large cartridge charging machine clamping machine with a punching failure rate reducing structure, and relates to the technical field of charging machine clamping machines, the large cartridge charging machine clamping machine comprises a main fixing frame, a top electric cylinder is installed at the top end of an air cylinder fixing plate, a gantry moving frame is arranged in the main fixing frame, and a folding claw arm is arranged on the right side of the main fixing frame. According to the large cartridge charging machine clamping machine with the clamping failure rate reducing structure, the main fixing frame, the top electric cylinder, the first pin shaft, the first needle bearing, the second pin shaft, the second needle bearing, the hinge seat and the like are arranged, and the folding claw arms, the folding claw heads, the fixing claws and the claw grooves are arranged; the folding claw arm swings downwards by taking the second pin shaft as the circle center under radial thrust and is folded with the fixed claw, the folding claw head is matched with the fixed claw and the claw groove in shape and size, the folding claw head and the fixed claw are tightly folded, and the claw clamp is smoothly opened and closed; through the improvement of the structure, the failure rate of the card punching mechanism is reduced, and the problem that the bearing of the card punching mechanism is easy to damage is solved.

The utility model relates to automatic detection technical field discloses a kind of needle bearing ring sorting machine, including rack, the outer wall top of the rack is fixedly connected with support frame, the outer wall of the support frame is provided with push mechanism, the outer wall top of the rack is fixedly connected with fixed base, the outer wall of the fixed base is provided with conveying mechanism, the outer wall of the rack is fixedly connected with connecting plate, the outer wall of the connecting plate is provided with feeding mechanism, the outer wall top of the rack is fixedly connected with detection table, the inner wall of the rack is provided with material receiving mechanism, the outer wall front side of the connecting plate is provided with self-adapting mechanism.In the utility model, workpiece in material box moves to feeding platform area under the push of other workpieces inside feeding box, workpiece is moved to bearing detector to detect and judge workpiece inner diameter error, then servo motor drives discharge pipe to rotate to above corresponding discharge box, the whole mechanism realizes the automation of process, improves detection efficiency.

The invention discloses a structural optimization design for improving the six-gear reliability of an ML645 transmission assembly, relates to the technical field of transmissions, and relates to the structural optimization design for improving the six-gear reliability of the ML645 transmission assembly. The six-gear transmission structure comprises an intermediate shaft, a six-gear synchronizer assembly, a middle six-gear meshing piece, an intermediate shaft rear bearing and a rear cover, the transmission assembly is provided with a power input end and a power output end, and the intermediate shaft is designed to be lengthened. The auxiliary support is added for the intermediate shaft, the mounting hole and the auxiliary support bearing are added in the rear cover, the intermediate shaft is lengthened to form the auxiliary support for the intermediate shaft, and by means of the auxiliary support for the intermediate shaft, cloth type indentation caused by stress unbalance loading of an inner hole of a six-tooth fitting piece, a needle bearing and a middle six-tooth lining and enlarging of the fit clearance of the inner hole are avoided; gear skipping caused by fretting wear of the gear sleeve and the combination gear is avoided, and the service life of a product is guaranteed.

The utility model discloses a roller pin spinning roller structure, which comprises a spinning roller shaft, the spinning roller is arranged on the spinning roller shaft in a sleeving manner; the rolling needles are arranged between the rotating wheel shaft and the rotating wheel, and the rolling needles are sequentially arranged along the periphery of the rotating wheel shaft; the glands are pressed at the two ends of the spinning roller; and the needle bearing is arranged between the gland and the spinning roller. The rolling needle spinning roller structure is simple in structure and reasonable and compact in design, the bearing capacity of the spinning roller structure can be effectively improved, the size of the spinning roller can be effectively reduced under the condition of the same bearing capacity, the service life of the spinning roller can be effectively prolonged, and therefore cost can be effectively saved.

The utility model discloses a pressure self-tightening sealing sleeve anti-scouring stop valve. The check valve comprises a valve body and a valve element in the valve body, the outer diameter of the valve element is matched with an inner hole of a throttling sleeve to enable the valve element to move up and down in the axial direction, a throttling channel is formed in the periphery of the throttling sleeve, the throttling sleeve is connected with a valve deck, and a cover plate is fixed to the periphery of the outer side of the upper portion of the valve deck and connected with the valve body. The upper portion of the valve element is connected with the lower portion of the valve rod in a limiting mode, a polished rod portion in the middle of the valve rod penetrates through the valve cover, the upper portion of the valve rod is screwed with the valve rod nut, and the needle bearing is placed on a shaft shoulder portion of the valve rod nut and used for supporting the valve rod nut. The upper portion of the bearing seat is matched with the bearing cover to limit axial displacement of the valve rod nut, the upper end of the stand column penetrates through the lower end of the bearing seat to be fastened, and the lower end of the stand column is fixed to the cover plate. The throttling channel on the circumference of the throttling sleeve bears scouring generated by medium throttling, and a sealing face is effectively protected.

The utility model discloses a reverse gear intermediate shaft positioning structure for a gearbox of a light bus, which solves the problems that the structure is complicated, the disassembly and assembly are inconvenient, and a nut is loosened and falls into a gearbox in the prior art, and comprises a gearbox shell, a rear cover shell and a reverse gear intermediate shaft, the reverse gear intermediate shaft comprises a positioning section, a bearing mounting section and a limiting section which are connected in sequence, the diameter of the positioning section, the diameter of the bearing mounting section and the radial minimum width of the limiting section are sequentially increased; one end of the positioning section is inserted into a counter bore of the transmission shell, and a reverse gear thrust washer is sleeved on the positioning section; the bearing mounting section is sequentially sleeved with a needle bearing and a reverse intermediate gear; one end of the reverse-gear thrust washer abuts against the transmission shell, and the other end of the reverse-gear thrust washer abuts against the end face of the reverse-gear intermediate gear. The end of the limiting section is inserted into a groove of the rear cover shell, the groove is matched with the radial section of the limiting section in shape, and the limiting section abuts against the end face of the intermediate gear.

The invention discloses a linear driver which comprises a semi-circular-arc-shaped rack and a driving sliding base limited on the semi-circular-arc-shaped rack in a sliding mode, and a plurality of layers of driving swing plates meshed with the semi-circular-arc-shaped rack are arranged on the driving sliding base. A plurality of layers of second arc teeth are arranged on the side face of the semi-arc-shaped rack, and first arc teeth meshed with the corresponding second arc teeth are arranged on the side face of the driving swing plate. A crankshaft is rotationally connected to the driving sliding seat, and an eccentric disc is eccentrically arranged on the crankshaft; the driving swing plate is in transmission connection with the eccentric disc through the needle bearing, and the crankshaft is in transmission connection with the transmission mechanism. The eccentric disc is driven by the transmission mechanism to rotate, so that the first arc teeth of the driving swing plate are driven to be engaged with the tooth surfaces of the second arc teeth on the semi-circular-arc-shaped rack for displacement. According to the linear driver and the linear driving method thereof, driving is achieved on the basis of circumferential swing of an eccentric structure, and the linear driver is matched with a robot joint in the start-stop stage or during load sudden change.

The utility model relates to the technical field of machine tool machining, in particular to a slotting head which comprises a cutter handle body shaft, a box body and a slotting cutter rod shaft, the cutter handle body shaft is installed on the end face of a machine tool spindle unit, a cutter handle bearing is installed on the outer surface of the cutter handle body shaft, and the cutter handle body shaft is connected into the box body through the cutter handle bearing. A cylindrical cam is fixedly connected to one end of the knife handle body shaft, a cam groove is formed in the knife handle body shaft, a knife inserting rod is detachably connected into the knife inserting rod shaft, a connecting shaft is fixedly connected to one end of the knife inserting rod, and a needle bearing is installed on the outer surface of the connecting shaft. The needle bearing moves in the cam groove of the cylindrical cam to drive the connecting shaft to move, the connecting shaft is connected with the needle bearing and the slotting tool rod shaft, the needle bearing transmits rotation motion and power of the cylindrical cam to the slotting tool rod shaft, and therefore the cylindrical cam is driven by the tool handle body shaft to rotate. The effect of changing rotary motion into reciprocating rectilinear motion is achieved through a cam groove of the cylindrical cam.

The utility model relates to the technical field of bearings, and provides a rubber combined needle roller bearing for an automobile steering system, which comprises a stamping outer ring, a needle roller body is arranged inside the stamping outer ring, a retainer is arranged outside the needle roller body, a bearing outer sleeve is arranged outside the stamping outer ring, and the bearing outer sleeve is sleeved outside the stamping outer ring. The stamping outer ring is fixedly connected with the bearing outer sleeve, an outer sleeve framework is annularly arranged at the corner of one side of the bearing outer sleeve in a sleeving mode, the bearing outer sleeve is attached to the outer portion of the stamping outer ring, and a connecting frame is fixedly connected to one side of the outer sleeve framework. Damping and noise reduction can be effectively achieved, corrosion resistance and abrasion resistance are improved through the arranged outer sleeve framework, the outer sleeve framework is tightly combined with the bearing outer sleeve, and a stable supporting structure is provided.

The utility model discloses a cross shaft universal joint with good sealing performance, and belongs to the technical field of universal joints. Comprising a universal joint body and a sealing mechanism, the universal joint body comprises a pair of universal joint forks and a cross shaft, connecting grooves are formed in the ends, close to each other, of the universal joint forks, needle bearings are arranged at the four ends of the cross shaft in a sleeving mode, the sealing mechanism comprises fixing grooves formed in the two sides of the connecting grooves, and the needle bearings are embedded in the fixing grooves. A first sealing piece is arranged at one end of the fixing groove, a second sealing piece is arranged at the other end of the fixing groove, and the first sealing piece and the second sealing piece seal the fixing groove; the cross shaft universal joint applied to the good sealing performance can prevent dust, silt, water and other impurities from invading the interior of the universal joint, so that the purpose of prolonging the service life of the universal joint is achieved.