68 results about "Cycloid gear" patented technology

Apparatus and methods relate to a gear reducer, which may be used downhole to reduce rotational speed output from a downhole motor, such as a turbine motor, to a slower speed desired for rotation of a drill bit. The gear reducer includes a planetary gear arrangement coupled to receive rotational input from the downhole motor and a cycloidal gear arrangement driven by rotation resulting from the planetary gear arrangement. An output shaft couples to the cycloidal gear arrangement and rotates during operation slower than the rotational input from the downhole motor.

The invention discloses a self-clearance-eliminating cycloidal pin gear speed reducer, and aims to solve the double pain points that in the prior art, an assembly clearance is difficult to control, and the clearance cannot be compensated after abrasion. The speed reducer comprises a machine shell, a main bearing, an output flange, a cycloidal gear, a conical pin and an elastic pressing piece, and is characterized in that the conical pin, cycloidal teeth of the cycloidal gear and a pin groove of the machine shell are all provided with the same taper, the elastic pressing piece is installed on the machine shell and exerts pre-compression force on the pin, and the elastic pressing piece, the conical pin and the pin are made to be tightly attached to eliminate an initial gap; after abrasion, the elastic pressing piece can push the conical pin needle to conduct self-adaptive gap compensation along the conical surface, and the meshing stability is guaranteed through the taper self-locking characteristic. Meanwhile, the structure can be flexibly matched with three transmission modes of'a first-stage planetary gear and a second-stage cycloid ', 'single-stage cycloid cam shaft driving' and'single-stage cycloid cam shaft and a cross slide block ', the effects of reducing machining and assembling cost, maintaining transmission precision for a long time and reducing maintenance loss are achieved, and the structure is suitable for the field of precision transmission.

The invention provides a cycloidal-pin wheel speed reducer. An eccentric mechanism is arranged on an input mechanism in a sleeving mode, and a cycloidal wheel mechanism is arranged on the eccentric mechanism in a sleeving mode through a first bearing assembly; the rack comprises a plurality of outer roller pins which are distributed at intervals; the output mechanism comprises a plurality of inner roller pins which are distributed at intervals; the inner roller pin is provided with a corresponding first shaft sleeve; the outer rolling needle is provided with a corresponding second shaft sleeve; wherein the diameter ratio of the outer roller pins to the inner roller pins is 1: 2-2: 1, and the number of the inner roller pins is 40%-60% of that of the outer roller pins; the outer edge tooth profile of the cycloidal gear mechanism is meshed with the outer roller pin, and the inner roller pin and the first shaft sleeve correspondingly penetrate through an output hole of the cycloidal gear mechanism. By setting the diameters of the inner roller pin and the outer roller pin which are relatively close and the specific quantity proportion of the inner roller pin and the outer roller pin, the shaft sleeve loss of the roller pins can be reduced, the back driving torque can be reduced, the service life of the inner roller pin and the service life of the outer roller pin can be balanced, and the production and maintenance cost can be reduced.

The invention discloses a low-noise transmission mechanism capable of coaxially outputting large torque, which is characterized in that a motor is fixed on a casing through a screw, a knurling position on a motor shaft is tightly pressed and matched with an eccentric shaft sleeve and is in transmission with the motor shaft, the eccentric shaft sleeve is arranged in a power output disc, and a fixed inner gear is sleeved into the power output disc to be meshed with two cycloidal gears; the tooth surface of the convex tooth root of the power output disc meets the tooth surface of the concave tooth root of the fixed inner gear, the linear teeth can provide smooth tooth surface pairing all the time, the tooth root tooth surface of one gear cannot make contact with the tooth root tooth surface of the other gear, the cross sliding block is installed in the power output disc, the output shaft is installed on the cross sliding block, and the output shaft is sleeved with the front cover plate and fixed through a screw. The transmission efficiency is high, rolling friction is achieved, the structure is simple, the input shaft and the output shaft are located on the same axis, the size is small, and contact stress is small; transmission parts are good in abrasion resistance, low in noise, high in bearing capacity, small in part heating, long in service life, small in tooth surface abrasion and convenient to install, and multi-tooth meshing is achieved.

The application discloses a high-precision transmission device, and belongs to a mechanical transmission device. The device comprises a split shell and three-stage transmission mechanisms integrated in the split shell and sequentially connected in transmission. In the three-stage transmission mechanisms, the sun gear of the first-stage involute planetary gear transmission mechanism is connected with an external input motor, and the planet gear and the cam shaft of the cycloid pin gear are connected through a spline. The second-stage cycloid pin gear transmission mechanism adopts a symmetrical layout of double cycloid gears and is driven by an eccentric cam shaft. The third-stage variable-thickness gear transmission mechanism comprises a variable-thickness pinion and a variable-thickness gear, the thickness of the gears changes nonlinearly along the axial direction, and the variable-thickness gear changes the axial meshing position through an adjusting gasket to control the side gap. The high-precision transmission device has the advantages of adjustable speed ratio, high stiffness, parallel shaft transmission, high precision, high efficiency, high rigidity, light weight and long service life, and can be applied to complex working conditions of robots.

The present invention discloses an internal-meshing RV-C reducer for industrial robots. After the cycloid wheel is reshaped, a reasonable clearance (radial clearance Δj and side clearance Δc) is generated between the inner cycloid teeth and the cycloid tooth grooves. This prevents the meshing parts from getting stuck when the cycloid wheel thermally expands under rated load. Furthermore, the structure of the inner cycloid gear ring is simplified and the load-bearing capacity is improved through concave-convex meshing.

The application relates to a hollow type speed reducer which comprises a pin gear shell and a first stage speed reduction component and a second stage speed reduction component, the first stage speed reduction component comprises a driving wheel, a double gear and a planetary gear, the second stage speed reduction component comprises a plurality of eccentric shafts, two cycloid gears, a plurality of pin pins and an output shaft cover, the output shaft cover is rotationally arranged in the pin gear shell, and the planetary gear is connected to one end of the eccentric shaft; a cooling cavity is arranged in the eccentric shaft, the output shaft cover comprises an upper cover and a lower cover, the upper cover is arranged close to the planetary gear, annular liquid storage cavities are arranged on the sides adjacent to the upper cover and the lower cover, the two ends of the eccentric shaft are respectively and sealingly rotationally connected to the upper cover and the lower cover, and the two ends of the cooling cavity are respectively communicated with the two liquid storage cavities. According to the application, the cooling cavity is arranged in the eccentric shaft, circulation and flow of the cooling liquid between the cooling cavity and the liquid storage cavities can be formed when the speed reducer rotates forward and reversely, the annular liquid storage cavities facilitate heat dissipation of the cooling liquid, and the heat dissipation and temperature control effects of the eccentric shaft and the cylindrical cam thereon can be greatly improved.

The invention relates to the technical field of aircraft airborne equipment, and provides a speed reducing mechanism and a rotary electric steering engine, the speed reducing mechanism comprises a needle pin gear, a cycloid gear ring and an output shaft, the cycloid gear ring adopts a hypocycloid gear, and an epicycloid gear is arranged on the output shaft; the tooth profile of the needle pin gear and the tooth profile of the hypocycloid gear are conjugated to form a small-tooth-difference internal meshing gear pair. The tooth profile of the pin gear and the tooth profile of the epicycloid gear are conjugated to form a small-tooth-difference internal meshing gear pair, transmission of power and motion is achieved through conjugate motion between the tooth profiles, and N-N type small-tooth-difference planetary gear transmission is formed by forming two-stage cycloid pin gear tooth profile internal meshing. High bearing performance and stability of cycloid tooth profile multi-tooth meshing are reserved, a larger reduction ratio is achieved through superposition of two-stage inner meshing, and meanwhile an intermediate output mechanism needed by traditional two-stage transmission is simplified.

A gear assembly in accordance with at least some embodiments of the present technology includes first and second supports extending circumferentially around an axis in first and second planes, respectively. The gear assembly further includes a first transfer member including first lobes and first troughs circumferentially alternating around the axis in a third plane. The gear assembly also includes a second transfer member including second lobes and second troughs circumferentially alternating around the axis in a fourth plane. The planes intersect the axis with the third and fourth planes between the first and second planes. The gear assembly further includes first and second pins circumferentially interspersed around the axis and extending between the first and second supports. The gear assembly transfers torque at least primarily via contact between the first pins and the first lobes and via contact between the second pins and the second lobes.

The invention discloses a three-piece type cycloidal pin gear speed reducer. Comprising a shell assembly composed of a pin wheel shell and end covers at the two ends, an input transmission assembly comprising a high-speed input shaft and a hollow shaft sleeved with three 120-degree eccentric phase eccentric sleeves, a cycloidal gear assembly comprising three cycloidal gears which are in one-to-one correspondence with the eccentric sleeves and are evenly distributed at 120 degrees, and a meshing transmission assembly comprising a pin gear pin and a gear pin sleeve. The output transmission assembly comprises a pin disc and a low-speed output shaft, the cycloidal gear is in rolling fit with the eccentric sleeve, and the pin disc is linked through a shaft pin to achieve power output; according to the design, through the 120-degree uniform distribution structure of the three eccentric sleeves and the three cycloidal gears, load trisection transmission and dynamic balance of a transmission system are achieved, and the bearing capacity and the transmission stability are remarkably improved.

The invention belongs to the technical field of robot speed reducers, and particularly relates to improvement of Japanese RV speed reducers, in particular to a robot long-service-life light-weight CQ double-cycloid hollow speed reducer which comprises an inner cycloid gear ring, a planet carrier, a double-eccentric hollow shaft, cycloidal gears, bearings and other parts, and is characterized in that eccentric sections on the double-eccentric hollow shaft are connected with the cycloidal gears through the RN bearings; the cycloid gear teeth are meshed with the inner cycloid gear to drive the planet carrier to realize transmission output, so that a single-stage cycloid speed reducing mechanism is formed; and a concave-convex double-cycloid transmission structure is adopted, so that the bearing capacity is improved. The RV speed reducer has the technical effects that (1) the service life is long: the precision service life of the whole machine reaches 13000h, which is more than twice of the 6000h of the existing RV speed reducer; (2) light weight: a planetary stage in an existing RV speed reducer is removed, and light weight is realized; and (3) the adaptability is high, a concave-convex double-cycloid transmission structure is adopted, the reduction ratio is increased, the bearing capacity is improved, and the device is more suitable for a humanoid robot cycloid joint module.

The brushless external fuel pump comprises a pump head assembly, a motor assembly, a connecting disc assembly and a control assembly, the pump head assembly is arranged at the upper end of the motor assembly, the control assembly is arranged at the lower end of the motor assembly, and the connecting disc assembly is arranged between the pump head assembly and the motor assembly. The motor assembly comprises a motor shell, a motor stator assembly, an oil separation sleeve assembly and a motor rotor assembly which are sequentially arranged from outside to inside. The pump head assembly comprises a pump head installed on the motor shell, an oil inlet channel with one end communicating with the outside of the left side of the pump head and an oil outlet channel with one end communicating with the outside of the right side of the pump head are arranged in the pump head, and a cycloid gear assembly is arranged at the lower end of the pump head. The other end of the fuel inlet channel is communicated with the other end of the fuel outlet channel through the cycloid gear assembly, the requirements for high fuel pressure and large flow of a large heavy truck can be met, and the service life of the fuel pump is guaranteed.

The application discloses a kind of cycloid motor, including brake device, oil distribution assembly, shell and rear side plate, brake device is equipped with brake shaft in, brake shaft is extended outside brake device, brake shaft is connected with oil distribution assembly by transmission shaft, transmission shaft middle section is connected with cycloidal pin gear assembly, cycloidal pin gear assembly includes stator body and cycloid gear, transmission shaft is engaged with cycloid gear;Oil distribution assembly includes oil distribution disc and oil distribution ring, oil distribution disc has several oil distribution holes, transmission shaft is embedded in oil distribution ring by passing through oil distribution disc;Shell is fixedly connected with rear side plate, sealing ring is equipped on oil distribution ring, inside sealing ring is A cavity, B cavity between oil distribution ring and rear side plate, A oil port and B oil port are opened on shell, A cavity is connected with A oil port, B cavity is connected with B oil port;Shell is equipped with auxiliary block and second spring, second spring is opposite with auxiliary block, auxiliary block is sealed with oil distribution ring, auxiliary block can prevent high-pressure oil into brake device.

The invention relates to a gearbox (16), in particular for use in electronic gripping or clamping directions, a drive unit (10) and electronic gripping or clamping devices (120), wherein the gearbox comprises a drive shaft (24), an eccentric (28), a first internal gear (30), a first external gear (38), a second internal gear (32), a second external gear (40), a first output element (46), a second output element (48) and an output shaft (58).

The invention relates to the technical field of gear machining, and discloses a gear turning method of a cycloid-like internal meshing gear, which comprises the following steps of: establishing a tooth profile mathematical model based on an arc meshing line, determining a tooth crest and tooth root conjugate tooth profile equation of an external gear and an internal gear, and establishing a four-coordinate system and a spatial motion relation; an innovative variable-domain directional search coupling dichotomy algorithm is adopted, a blade curve is accurately solved on the axial section of Z = 0, and the problem of unstable calculation caused by tooth surface singular points is solved; a parameterized tool is designed, linkage cutting of the tool and a workpiece and control of cutting parameters are achieved by means of a five-axis numerical control machine tool, the precise machining effect is finally obtained, the gear bearing capacity is improved, the transmission stability is improved, the single-piece machining time is only 30 minutes, and the technical bottlenecks that a traditional method is low in machining efficiency and prone to over-cutting and under-cutting are broken through. The method is suitable for the precision transmission field of aerospace, new energy automobiles and the like, and the high-precision industrial manufacturing problem of the cycloid-like gear is practically solved.

The application discloses a high-volume-efficiency combined gear pump and relates to the technical field of gear pumps.The combined gear pump comprises a gear pump shell, a gear pump end cover is connected to the upper end opening of the gear pump shell, a driving cycloid gear shaft is rotationally connected in the gear pump shell, a cycloid gear is arranged on the outer wall of the driving cycloid gear shaft, a driving gear is arranged on the outer side of the cycloid gear, the outer ring teeth of the driving gear are meshed with the outer ring teeth of a driven gear, upper side floating shaft sleeves are arranged at the upper ends of the driving gear and the driven gear, upper side oil pressing holes are arranged on the upper side floating shaft sleeves, lower side floating shaft sleeves are arranged at the lower ends of the driving gear and the driven gear, lower side oil pressing holes are arranged on the lower side floating shaft sleeves, an oil inlet and an oil outlet are arranged on the outer wall of the gear pump shell, a pre-pressing oil channel and a constant-pressure oil channel are arranged on the gear pump end cover, an overflow valve can be arranged between the pre-pressing oil channel and the constant-pressure oil channel, and the meshing and merging positions of the driving gear and the driven gear are communicated with the oil outlet.The combined gear pump has high volume efficiency and small pressure pulse.

The utility model provides a blade transmission assembly and electric scissors comprising the same. The blade transmission assembly comprises a blade bearing, a fixed blade supporting piece, a movable blade supporting piece and a center screw sequentially penetrating through the fixed blade supporting piece, the movable blade supporting piece and the blade bearing. The movable blade supporting piece and the cycloid gear below the movable blade supporting piece integrally form an integrated transmission piece. The central screw penetrates through the middle part of the integrated transmission part and a group of wear-resistant gaskets and needle roller plane bearings which are respectively arranged on two sides of the integrated transmission part; the blade seat is thin in top and thick in bottom and is provided with a hole upwards from the bottom surface; the bevel gear extends from the bottom of the blade seat, at least one side of the bevel gear is exposed out of the blade seat, and the bevel gear is in meshing transmission with the cycloid gear; and the bevel gear is driven by a gearbox at the lower part of the bevel gear. Working noise and mechanical abrasion of the scissors can be reduced, and the service life of the scissors is prolonged.

The utility model discloses a kind of fishing reel deceleration rotation tooth, including main shell, the main shell is equipped with deceleration component, the deceleration component includes rotating gear, the rotating gear is equipped with eccentric round hole, eccentric round hole is equipped with cycloidal gear, the front side of cycloidal gear is fixedly connected with multiple cylindrical blocks, the inner of rotating gear is equipped with cover plate, the cover plate is equipped with multiple through holes, each cylindrical block is passed through corresponding through hole, the left side inner wall of main shell is equipped with needle roller fixed seat, needle roller fixed seat is located in rotating gear, the right side of needle roller fixed seat is equipped with cycloidal groove, the left side of cycloidal gear is fixedly connected with cycloidal gear. The utility model is equipped with deceleration component, when rocker arm rotates take-up, main shaft will be moved up and down at slower speed, so that fishing line can be more regular and wrap on reel, transmission is more stable, better adaptation to demand of fly fishing method to fast response, accurate control.

The utility model relates to a kind of cycloidal gear grinding clamps, including jig platform plate, jig installation base, axial positioning structure, radial positioning structure, the jig installation base is fixed in the bottom surface of jig platform plate, the axial positioning structure is set in the top surface center of jig platform plate, the jig platform plate, jig installation base, axial positioning structure such as axial center are set, the radial positioning structure is provided with four groups, four groups radial positioning structure such as circumferential angle setting is in the side of jig platform plate.The utility model optimizes the setting of cycloidal gear grinding clamp, structure has higher precision, can satisfy the requirement of fine processing, and structure uses general design, is suitable for a variety of specifications cycloidal gear processing, in addition structure uses replaceable contact component, reduce maintenance cost, suitable for promotion and use.

The utility model discloses a kind of forced lubrication circulation systems of spiral filter centrifuge, including bearing seat and differential mechanism installed on bearing seat;Its characterized in that the bearing seat is connected with oil tank;Oil tank is sequentially connected with cycloidal gear pump motor set, the filter that has filtration to lubrication and the cooler that has cooling to lubrication;The oil inlet pipe that is convenient for the lubricating oil to be transported to differential mechanism inside is connected between the cooler with differential mechanism;Rotary joint is installed between the differential mechanism and oil inlet pipe.The utility model extracts lubricating oil in oil tank by cycloidal gear pump motor set, lubricating oil is sequentially filtered impurity by filter, cooler is cooled to lubricating oil, lubricating oil after cooling enters differential mechanism inside and is lubricated, lubricated lubricating oil is sprayed to bearing under the action of differential mechanism rotation, lubricating oil after bearing lubrication is returned to oil tank, to realize the circulation use of lubricating oil, to improve lubrication and heat dissipation effect.

The invention provides a pin wheel housing, planet carrier and bearing integrated cycloidal reducer joint module which comprises an input shaft, a cycloidal reducer assembly, a motor, an encoder and a driver, the cycloidal reducer assembly comprises a pin wheel housing, a cycloidal gear and a planet carrier, the cycloidal gear and the planet carrier are arranged in the pin wheel housing, and a rolling body is arranged between the pin wheel housing and the planet carrier. One end of the planet carrier is fixedly connected with a flange cover plate capable of supporting a pin shaft of the planet carrier, the flange cover plate and the pin shaft are fixed in an adhesive mode, screws are reduced, a roller path on an outer ring of a bearing and a pin wheel housing are arranged to be an integrated component, rolling constraint can be provided for a rolling body, meanwhile, axial limiting structures such as a check ring and a gasket are reduced, and the service life of the rolling body is prolonged. The axial size of the speed reducer is reduced, the whole parts are fewer, the weight is lighter, and the rigidity is higher.

The invention discloses a cycloidal gear tooth profile optimization method and a small RV speed reducer. The invention discloses a small RV speed reducer, which relates to the technical field of speed reducers, and comprises an input shaft, a planetary gear assembly, a cycloid speed reduction assembly and an output assembly, the output end part of the input shaft is sleeved with a transmission sun gear, the input shaft and the transmission sun gear are concentrically arranged, and the cycloid speed reduction assembly is fixedly connected with the output assembly. After the input shaft penetrates through the cycloid speed reduction assembly, the transmission sun gear is meshed with the crank planetary gear set to form transmission, so that the cycloid speed reduction assembly synchronously generates planetary rotation, and speed reduction output is conducted through the cycloid speed reduction assembly by means of the output assembly. According to the cycloidal gear, the assembly structure is simple, the axial length needed by a traditional cycloidal gear is reduced, the size is greatly reduced, meanwhile, the minimum curvature radius is 0.5 mm after optimization treatment is conducted on the obtained tooth profile curve through the cycloidal gear tooth profile optimization method, the machining production pain point encountered in the speed reducer production and manufacturing industry is successfully solved, and the production efficiency is improved. Batch production is facilitated, the cost is greatly reduced, and the service life of the product is prolonged.

The invention relates to an actuating device (1) for actuating a disconnect coupling (33) of a drive (30), with which a drive machine (31) can be disconnected and coupled from and / or to an output (32), comprising: - a transmission device (2) for connecting a drive device (3) of the actuating device (1) with an output device (4) of the actuating device (1), - wherein the transmission device (2) comprises a wave gear and / or a cycloidal gear. Furthermore, the invention relates to a drive (30) for a hybrid or electric vehicle with an actuating device (1).

The present disclosure relates to electromagnetically-controlled magnetic cycloidal gear assemblies configured to achieve enhanced torque capacity, and methods of operating same. In one example embodiment, a method includes sensing a position of a cycloid relative to a stator, where the stator includes a plurality of electromagnets, and the cycloid includes a plurality of permanent magnets. Also, the method includes determining respective torque characteristics concerning the respective electromagnets based upon the sensed position, where the respective torque characteristic that is determined concerning each respective one of the electromagnets is indicative of a respective relative position of the respective electromagnet in relation to a respective closest one of the permanent magnets. The method additionally includes outputting from a controller, for receipt respectively at least indirectly by the respective electromagnets or respective control devices coupled thereto, a plurality of output signals respectively based at least in part upon the respective torque characteristics.

The embodiment of the application provides an RV reducer, by setting an oil injection hole in a planet carrier, setting a through oil hole penetrating through a vertical direction of a rolling pin and setting a centrifugal hole communicating with the through oil hole in a horizontal direction of the rolling pin, so that a lubricating channel is formed, lubricating oil can slide out from the oil injection hole, then fall into the through oil hole and finally flow to the outside of the rolling pin from the centrifugal hole under the centrifugal action, so that the meshing position of the rolling pin and the cycloid gear is lubricated. The lubricating structure is simple in design and easy to realize, and the lubricating oil flows to the outside of the rolling pin through the centrifugal hole under the centrifugal force to lubricate the tooth profile of the cycloid gear, so that the problem of insufficient lubrication at the small area meshing position between the rolling pin and the cycloid gear is solved, and the transmission precision of the RV reducer is maintained.

This invention discloses a grinding wheel dressing method for machining cycloidal gears using a worm gear grinding machine. The key feature is the use of a worm gear grinding machine that integrates cycloidal gear machining and grinding wheel dressing functions to achieve rapid and precise grinding wheel dressing. The worm gear grinding machine, with an adjustable central axis swivel angle for the dresser, increases the dresser's freedom of movement during dressing, reducing the impact of changes in the grinding wheel tooth profile, controlling errors during dressing, and improving machine tool stability. A contact vibration sensor is installed on the grinding wheel; by sensing vibration data, the machine tool automatically adjusts the dresser's alignment, simplifying manual operation, improving dressing accuracy, and saving time. After the initial alignment, the dresser does not need to be aligned again, improving dressing efficiency. By differentiating the two-stage machining process of dressing the grinding wheel, the roughing stage quickly removes excess material from the grinding wheel while the finishing stage maintains a good surface morphology.

The utility model belongs to the technical field of speed reducers, and particularly relates to a novel speed reducer with small tooth difference. Comprising a speed reducer shell and a speed reducer end cover, a fixed gear is fixedly arranged in the speed reducer shell or the speed reducer end cover, transmission assemblies matched with one another are arranged in the speed reducer shell, and each transmission assembly comprises an eccentric input shaft, a first cycloid gear, a second cycloid gear and an output gear; when the eccentric input shaft rotates, the first cycloid gear can be driven to do cycloid rotation along the fixed gear, the second cycloid gear follows the fixed gear to do cycloid rotation, and due to the fact that the tooth number difference between the fixed gear and the first cycloid gear is the same as the tooth number difference between the first cycloid gear and the output gear, the tooth number of the first cycloid gear is the same as the tooth number of the second cycloid gear; therefore, the second cycloid gear can drive the output gear to rotate back. The reduction ratio of the small-tooth-difference speed reducer is obtained by subtracting the tooth number of the output tooth difference from the tooth number of the fixed gear and then dividing by the tooth number of the first cycloid gear or the second cycloid gear.

The epicyclic gear reducer can include an intermediate planet carrier connected between the drive ring gear and the driven wheel using a first sliding joint located on a first side of the intermediate planet carrier and a second sliding joint located on a second side of the intermediate planet carrier. The epicyclic gear reducer can also include an input shaft rotationally connected to the drive ring gear, and the drive ring gear is configured to transmit rotational motion of the input shaft to the intermediate planet carrier. The epicyclic gear reducer can also include an output sun gear connected to the intermediate planet carrier. The output sun gear can be further rotationally connected to a central output shaft.

This invention discloses a method for measuring the single-item deviation of cycloidal gears using a coordinate measuring machine (CMM), belonging to the field of precision testing technology and instruments. The method first generates theoretical feature points based on the parametric equations of the cycloidal gear, establishes the workpiece coordinate system of the cycloidal gear through a "coarse-fine" iterative strategy, and plans an interference-free measurement path to obtain discrete points on the actual tooth surface. Then, a non-uniform rational B-spline fitting algorithm is used to reconstruct the actual tooth profile curve, calculate the normal deviation of the actual tooth profile relative to the theoretical tooth profile, and perform Gaussian low-pass filtering on the original deviation data. According to national or industry standards, the pitch deviation, tooth profile deviation, and helix deviation of the cycloidal gear are evaluated respectively. This invention achieves high-precision fixed-type measurement and deviation evaluation of cycloidal gears on a general-purpose CMM, with advantages such as high measurement accuracy, good repeatability, and strong applicability.

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