103 results about "Epicycloid" patented technology

The invention relates to a loaded tooth surface contact analysis method direct at epicycloid bevel gear errors, and belongs to the field of theory of non linear vibration. Gear pair elastic deformation, support system torsion, gear processing errors and machine tool setting errors are taken into consideration to derive a novel error loaded contact analysis method. When analyzing one loaded tooth surfaced contact, real situation can be closer. The loaded tooth surface contact analysis method is usually used for setting parameters and machine tool parameters via V-H-J (V is the longitudinal set parameter of a gear pair, and the upward direction of a small gear is active; H is a coordinate set parameter of the gear pair, and the direction facing towards the big end of the small gear is active; J is the adjusting parameter along a coordinate direction, and the direction, distant from a big gear, of the small gear is active) within a real contact area under the conditions of loading and delivering errors and simulated load distribution and processing, so that impact of the errors is compensated to improve delivering performance and correct size and position of the contact area.

The invention discloses a machining method for an epicycloid gear. The machining method comprises the steps that (1) basic parameters of a generating gear are determined; (2) the motion mode forming the tooth surface of the generating gear is determined; (3) generating gear tooth surface shape correction is determined; (4) a tool path for forming the tooth surface of the generating gear is planned; (5) the motion through which the generating gear generates the gear is determined; (6) generation of the machined gear is completed. The machining method for the epicycloid gear has the advantages that compared with the Klingelnberg method, the structure of a cutterhead is greatly simplified, no crosshead shoe mechanisms are needed, and rigidity is improved; compared with the Oerlikon method, no knife tilt mechanisms are needed, the structure of a machine tool is greatly simplified, and rigidity is improved; an epicycloid gear and a hypoid gear can be machined on a knife-tilt-free rolled plate type bevel gear milling machine; tooth surface correction is achieved through software; second order precontrol over the positions, sizes and shapes of tooth surface contact spots can be achieved; required second order precontrol over transmission errors can be achieved; an epicycloid gear pair which is completely conjugated in theory can be machined.

The invention relates to a double-head claw pump rotor and its molded line. The molded line comprises an equidistance curve of a point meshing epicycloid, a modified arc segment, a tooth top arc segment, an intermediate connecting arc segment, an arc conjugate curve segment, and a tooth root arc segment. Two rotors adopt a central symmetrical structure. By setting the modified arc segment, the sharp points are eliminated, and severe wearing phenomenon of the rotors during operation can be avoided. The equidistance curve of the point meshing epicycloid and the modified arc segment are always spaced apart to avoid the formation of suction and exhaust closed volume, and a design parameter space of the rotor molded line is increased, the power consumption is reduced, and the pump efficiency isimproved. The molded line is designed in the double-head claw pump, compared with the other conventional pumps, the pump in the invention has the advantages of less wearing parts, compact structure,high pumping rate, no surge, and low vibration noise.

The invention discloses a cycloid steel ball planetary transmission mechanism and a robot joint speed reduction device thereof and belongs to the field of speed reduction transmission devices. The cycloid steel ball planetary transmission mechanism disclosed by the invention comprises a planetary plate, a central plate and a steel ball group. A gap d [d=Z0(h+delta)/2pi] is reserved between every two steel balls in the steel ball group; a tooth space, the tooth profile of which is a profiled hypocycloid, is formed in the end surface of the central plate, and a tooth space, the tooth profile of which is a profiled epicycloid, is formed in the end surface of the planetary plate. A cross steel ball constant speed transmission mechanism comprises the planetary plate, the steel ball group, a cross plate and an end cover plate; and structurally optimized straight line grooves are formed in the end surfaces of the planetary plate, the cross plate and the end cover plate. On the basis of retainment of a small speed ratio performance, the actual bearing capacity of the robot joint speed reduction device can be effectively enhance and the service life of the robot joint speed reduction device can be effectively prolonged, so that the cycloid steel ball planetary transmission mechanism is in particular suitable for an electric rotary joint of a high speed carrying robot.

The invention discloses a total-smooth claw type rotor. The rotor profile line is composed of 9 curves including the equidistant curve AB of the prolate epicycloid of a front claw arm, the front claw tip arc BC, the claw top arc CD, the rear claw tip arc DE, the equidistant curve EF of the curtate epicycloid, the pitch circle arc FG, the bottom claw tip arc GH, the equidistant curve HI of the prolate epicycloid of a rear claw arm and the claw bottom arc IA. Every two adjacent curves are connected smoothly, no non-smooth connection point or cuspidal point exists, and thus areas prone to abrasion, deformation and stress concentration are effectively avoided; the two claw type rotors which conduct synchronous opposite-direction double-rotation motion can be engaged correctly, and thus the sealing property, the mechanical property and the engagement property of the claw type rotors can be effectively improved; and the clearance volume is reduced, local high pressure is avoided in the mixing process, the power consumption of a claw type vacuum pump can be effectively reduced, the working efficiency of the claw type vacuum pump is remarkably improved, and the claw type rotor has important significance in the development of the claw type vacuum pump.

Gymnastic machine including an epicycloidal mechanism (2) for connecting an application member (3) of a driving device to resistive means (36); the mechanism (2) being provided with a satellite member (4) connected to the application member (3) by means of a first crank (5) having a pin (6); with a planetary member (7); with a second crank (8) which rotationally connects a movable rotation centre (9) on the satellite member (4) to a fixed centre (10) on the planetary member (7); and with transmission devices (11, 12, 13) for transmitting a relative motion between the satellite member (4) and the planetary member (7); the planetary member (7) being supported in freely rotatable manner around an axis (14) passing through the fixed centre (10); actuating members (15) being provided for imparting to planetary member (7) an angular movement (α) around the fixed centre (10) which corresponds to a relative angular variation (β) of the first and second cranks (5, 8), and a corresponding variation of the orientation of the path (21, 22) of the pin (6) of the satellite member (4).

The invention provides a sealed single-head spiral screw and double screws thereof and belongs to the technical field of screw pumps. The spiral of the single-head spiral screw is in an asymmetric tooth shape. A force transmission edge and a sealing edge are arranged on the two sides of the tooth shape respectively. The tooth-shaped profile of the sealing edge is an elongated epicycloid. The tooth-shaped profile of the force transmission edge is a combined profile of an elongated epicycloid, an involute and a curtate epicycloid. According to the tooth-shaped profile of the single-head spiral screw, the sealing edge on one side is the elongated epicycloid, the force transmission edge on the other side is combination of the elongated epicycloid, the involute and the curtate epicycloid, the engagement lines are continuous, and no gap exists between the engagement lines. According to a double-screw pump or a double-screw type vacuum pump with the sealed singe-head spiral screws, the tight sealing effect can be achieved, and torque is transmitted to the tooth-shaped profile of the force transmission edge of the involute segment of the drive screw from the tooth-shaped profile of the force transmission edge of the involute of the driven screw.

The invention discloses an epicycloid centrifugal pump impeller. The epicycloid centrifugal pump impeller comprises a wheel disc and blades which are fixedly arranged on one end face of the wheel disc. The tail sections of the blades are gradually changed to be of an epicycloid structure which extends in the radial direction of the wheel disc. According to the epicycloid centrifugal pump impeller, molded lines on the tail sections of the blades are epicycloids close to the fluid motion law, the impeller is designed to be in a half-open type, compared with a common centrifugal pump, loss at an outlet of the impeller can be reduced, the partial reflux phenomenon is reduced, and water pumping efficiency is improved.

The invention discloses a tooth form of a twin-screw compressor rotor. The tooth form is characterized in that each tooth form of end faces of a female rotor and a male rotor is formed by smoothly connecting five sections of a quadratic curve, wherein a tooth curve of the end face of the female rotor comprises a circular arc line and an epicycloid; a tooth curve of the end face of the male rotor comprises a circular arc line, an epicycloid and a circular arc envelope curve. The five tooth curves of each tooth of the female rotor comprises a circular arc A2B2, a circular arc B2C2, a pin tooth circular arc C2D2, an epicycloid c D2E2 and a circular arc E2F2, which are smoothly connected; and the five tooth curves of each tooth of the male rotor comprises a circular arc A1B1, a circular arc B1C1, a pin tooth circular arc C1D1, an epicycloid D1E1 and a circular arc E1F1, which are smoothly connected. The tooth form of the twin-screw compressor rotor disclosed by the invention can ensure that rotors with the same size and rotation speed have a larger flow intertooth area coefficient and a relatively shorter contact line, thus the manufactured compressor has good axial sealing performance and high efficiency. The tooth form of the twin-screw compressor rotor disclosed by the invention is applicable to locations, such as process screw compressors with high differential pressure, mini-sized refrigeration compressors and the like.

The invention provides a strict sealing type double-tooth double-screw-rod vacuum pump rotor molded line. One of rotors comprises a first addendum circular-arc segment ab, a first involute segment bc,a first point engaging epicycloid segment cd, a first dedendum circular-arc segment de, a second point engaging epicycloid segment ef, a second involute segment fg, a second addendum circular-arc segment gh, a third involute segment hi, a third point engaging epicycloid segment ij, a second dedendum circular-arc segment jk and a fourth point engaging epicycloid segment ka which are all sequentially connected end to end, and the other rotor has the same structure. In the rotating process, the molded lines are continuous everywhere, one to more engaging points exist under each corner, power consumption is reduced, and the limit vacuum degree is improved. A double-screw-rod vacuum pump adopts the molded line and can make dynamic balance performance of the female rotor and the male rotor be improved, no leakage triangle occurs in the running process, and the strict sealing type double-tooth double-screw-rod vacuum pump rotor molded line has the advantages that vulnerable parts are less, the structure is compact, the pumping rate is high, no surge occurs, and vibration noise is low.

The invention discloses a screw vacuum pump rotor profile. The screw vacuum pump rotor profile comprises a prolate epicycloid AB, a root circle BC with radius of Rr, a transition arc CG with radius of r1-Rr, a hypocycloid GD, an epicycloids DE, a transition arc EF with radius of Rt-r1, and an addendum circle FA with radius of Rt. Compared with the prior art, the screw vacuum pump rotor profile is novel conjugated rotor profile; two rotors are totally identical, and are both single-head asymmetric teeth; screw rotors are driven by synchronous gears to correct engage; and in synchronous rotation, any position and rotating angle cannot generate inter-tooth interference to own a complete engagement curve. Meanwhile, the rotors with the profile effectively transfer the torque, and solve leakage of gas from higher-pressure inter-tooth volume to lower-pressure adjacent inter-tooth volume caused by leakage triangle, so that a pump is higher in volume efficiency; and compared with other rotor molded lines, the screw vacuum pump rotor profile is higher in area utilization coefficient and low in machining and detecting costs.

The invention discloses a rack with a tooth trace shape of an epicycloid. Intersection lines of wheel teeth of the rack with a dividing plane, a tooth root plane and a tooth top plane are all prolate epicycloids; intersection lines of wheel teeth of a cylinder gear which is meshed with the rack with a dividing cylinder plane, a tooth root cylinder plane and a tooth top cylinder plane are also prolate epicycloids; in a central section of a tooth width direction, a toothed curve of the rack is a straight line; a toothed curve of the cylinder gear meshed with the rack is an involute; in the central section of the tooth width direction, the meshing of the rack with the matched cylinder gear is equivalent to the meshing of a traditional involute gear with the rack; therefore, the rack has constant transmission rate. In other sections parallel to the central section, the rack mutually corresponds to tooth outlines of the matched cylinder gear in a convex-concave mode; because of small comprehensive curvature and large comprehensive curvature radius among contact planes, the rack has large coincidence degree, stable transmission, high carrying capability and long service life. The rack has the advantages of overcoming the defects of small coincidence degree, large meshing impact and the like of a traditional rack with straight tooth lines, and solving the problem of axial force in the meshing of a rack with oblique tooth lines and the gear. The rack is suitable for high-speed overloaded transmission occasions, can be used as an up-to-date product of a traditional rack with straight teeth and a rack with oblique teeth, and has high popularization value.

The invention discloses an all-smooth screw rotor of a double-screw liquid pump. The all-smooth screw rotor of the double-screw liquid pump is characterized in that a left end surface molded line (501) comprises six circular arc sections, equidistant lines of two prolate epicycloid sections, and equidistant lines of two epicycloid sections, namely, a tooth root circular arc LAB, an equidistant line BC of a first prolate epicycloid, a first transition circular arc CD, an equidistant line DE of a first epicycloid, a first circular arc EF, a tooth top circular arc FGH, a second circular arc HI, an equidistant line IJ of a second prolate epicycloid, a second transition circular arc JK, and an equidistant line KL of a second prolate epicycloid, which are anticlockwise arranged; adjacent curves in the left end surface molded line (501) are in smooth connection, so that unsmooth connecting points are avoided, and an all-smooth end surface molded line is formed; the left end surface molded line (501) is completely the same as a right end surface molded line (502) and can be accurately engaged with the right end surface molded line (502) during the synchronous different-direction double-gyring movement, thus obtaining the all-smooth screw rotor.

The invention discloses a double-wave-line ball deceleration bearing with high rotary precision. The bearing comprises an input shaft, wherein the input shaft comprises a first mounting part, an eccentric part and a second mounting part sequentially connected in the axial direction; a first shell is movably arranged on the periphery of the first mounting part in a sleeving manner; an annular avoiding groove is formed in the first shell; a driving disc is movably arranged on the periphery of the eccentric part in a sleeving manner and is positioned in the avoiding groove; a ball mechanism is arranged between the driving disc and the inner end face of the avoiding groove; a second shell is movably arranged on the periphery of the second mounting part in a sleeving manner; a hypocycloid groove is formed in the second shell; an epicycloid groove is formed in the driving disc; the wave number of the hypocycloid groove is greater than that of the epicycloid groove; and a plurality of first balls are distributed between the hypocycloid groove and the epicycloid groove. The invention aims to provide the double-wave-line ball deceleration bearing which can increase the reduction ratio and reduce the wear loss, is small in error and transmission ratio error, and has multiple output modes.

The present invention is to provide a device of a pair of claw-type rotors having same profiles, the device includes a defined rotor and a conjugate rotor intermeshing with and conjugating to each other. The defined rotor includes a first claw having a cross-section profile having an epicycloid, a first arc, a second arc, a third arc, and a fourth arc all connected together in sequence in a counterclockwise direction. The first, second, third, and fourth arcs are connected with slope continuity, whereby locations of centers, values of radiuses and arc angles of the second and third arcs are capable of being defined in accordance with the slope continuity and geometric relations between the first and fourth arcs. The conjugate rotor has a first claw having a cross-section profile generated by utilizing a conjugate curve corresponding to the first claw of the defined rotor.

Arc-arc envelope curve and cycloid of point gearing are adopted in molded lines of tooth form of twin-screw mix transportation pump. Cycloid of point gearing and long limb epicycloids are utilized in main region of engagement, and arc-arc envelope curve is utilized in other region. Molded lines utilized in the invention are accorded with principle of engagement, and relevant curves are adopted for characteristics in different region of engagement. Thus, the molded lines of tooth form of twin-screw mix transportation pump are suitable to transporting polyphase media in higher transportation pressure, and high gas rate. Features are: easy of production and high efficiency.

A speed reducer includes a first transmission shaft, an eccentric wheel, a first roller assembly, a rotating wheel, a second roller assembly and a second transmission shaft. The rotating wheel includes a main body and an axle hole. The main body includes a convex structure and a concave structure. The convex structure is protruded from an outer periphery of the main body and has outer teeth. The outer teeth are contacted with the corresponding first rollers. The concave structure is concavely formed in a surface of the main body and includes inner teeth. The inner teeth are contacted with plural second rollers of the second roller assembly. The speed reducer of the present invention is an epicycloid-epicycloid speed reducer or a hypocycloid-hypocycloid speed reducer. Since the speed reducer is designed to have four operating situations, the speed reducer can have various reduction ratios.

The invention provides an asymmetric tooth-shaped two-end spiral screw with an involute force transmission side and belongs to the technical field of screw pumps. The screw has spirals on two ends; the spiral on one end is asymmetric-tooth-shaped; two tooth-shaped sides respectively comprise a force transmission side and a sealing side; the force transmission side takes involutes tooth-shaped lines; the sealing side takes extended epicycloids as tooth-shaped lines; the spiral on the other end of the screw is symmetric-tooth-shaped; two tooth-shaped sides respectively comprise a force transmission side and a sealing side; both the force transmission side and the sealing side take involutes as tooth-shaped lines. With perfect combination of two types of tooth-shaped lines including the involutes and the extended epicycloids, the two-screw pump with application of the screw is reliable in force transmission of a tooth-shaped surface of a screw rotator during operation, balanced in running, low in vibration noise and high in volumetric efficiency.

The invention discloses a measuring device which comprises a plurality of measuring cups which are connected by a ring. Each measuring cup is provided with a flap-shaped side wall, and a plurality of flaps formed by epicycloids are defined on the side wall. Each flap of a smaller measuring cup is contacted with the inner surface of a bigger measuring cup to define the space between the measuring cups, therefore, the flowing of air between the measuring cups is convenient. The air flow blocks the suction between the measuring cups. The epicycloids structure defines a plurality of longitudinal raising parts, is applicable to preventing the axes of the smaller measuring cup from moving inward and fixing the smaller measuring cup in a position. The epicycloids structure of the side wall defines a plurality of channels, and a plurality of outflow openings are formed in a container part, thus allowing liquid drop to freely flow out. The channels minimize the inner surface contact between the measuring cups, thus preventing the bonding of the surfaces of the measuring cups.

The invention provides a method for determining gear pump tooth profile molded line and a crescent gear pump. The method includes: provided a first formation circle, a second formation circle and a tooth circle; an eccentric distance for geometric compensation is arranged between the second formation circle and the first formation circle; a fixed point is determined on the circumference of the second formation circle, in the circle or outside the circle, so that the second formation circle rotates around the center of the first formation circle on the premise of keeping the first formation circle immobile; the locus of the fixed point forms a first epicycloid; a first distance is used for vector amplification on the first epicycloid to obtain a second epicycloid; and an envelope line formed by the center of the tooth circle moving along the second epicycloid used as the tooth profile molded line of the gear pump. Through the above technical scheme, the method is convenient for adjusting the shape, size and tooth gap of the tooth profile, so as to avoid large noise and ripple due to collision caused by larger gap.