12 results about "Epicycloid" patented technology

This invention provides a two-stage reducer based on cycloidal and epicycloidal transmissions, belonging to the field of reducer technology. The two-stage reducer includes a housing, a primary input mechanism, a primary reduction mechanism, a primary output / secondary input mechanism, a secondary reduction mechanism, and a secondary output mechanism. The primary and secondary reduction mechanisms employ either epicycloidal pinwheel transmission or cycloidal pinwheel transmission, and the transmission types are different. Both the primary and secondary reduction mechanisms include at least one cycloidal wheel, at least three eccentric crankshafts with pins evenly distributed along the circumference, and an intermediate fixing plate for fixing the eccentric crankshafts. Both the primary output / secondary input mechanism and the secondary output mechanism include pinwheels. Under the same reduction ratio, this invention exhibits good dynamic characteristics, a compact and simple structure, and the pinwheels can be designed with a sufficiently large diameter, thus improving load-bearing capacity. Furthermore, the pinwheels are fixed at both ends by bearings and can roll, reducing wear between components.

The utility model provides a screw vacuum pump rotor profile which comprises a master screw rotor profile and a slave screw rotor profile which are meshed with each other, the master screw rotor profile is provided with at least one group of claw-shaped end faces, and each claw-shaped end face is composed of an epicycloid segment AB, a tooth crest arc segment FA, a common epicycloid segment EF, an epicycloid segment CD and a tooth root circle segment DE. And the claw-shaped end surfaces of the driving screw rotor molded line and the driven screw rotor molded line are meshed with each other to generate an extrusion effect in the rotating process. According to the screw vacuum pump, the main screw rotor molded lines and the auxiliary screw rotor molded lines are arranged in a staggered mode and meshed with each other, the air transmission effect is enhanced through the characteristic of the special structure of the claw-shaped end face, and therefore the working efficiency of the screw vacuum pump is improved.

This invention provides a machining method for obtaining uniform surface machining accuracy of a variable pitch screw rotor, comprising the following steps: 1) Dividing the end face profile of the rotor into an involute, addendum circle, epicycloid, and dedendum circle; 2) Dividing one of the involute, addendum circle, epicycloid, and dedendum circle into N equal segments, with the connection point between each segment being the tool point; the line connecting the tool point and the origin is the extreme diameter L, and the angle between the extreme diameter L and the coordinate axis is θ; 3) For each toolpath, the tool point is used as the entry point, and the workpiece is rotated by an angle θ so that the extreme diameter is parallel to the coordinate axis; 4) The tool rotates along a direction parallel to the coordinate axis from one end of the workpiece to the other end; 5) After the tool is lifted to the outside of the workpiece, it moves to the cutting start end, and steps 1-4 are repeated until one of the involute, addendum circle, epicycloid, and dedendum circle is machined; 6) Steps 1-5 are repeated until all the involute, addendum circle, epicycloid, and dedendum circle are machined.

The invention relates to the field of vacuum pumps, and discloses a double-tooth claw type pump rotor and a vacuum pump thereof.The double-tooth claw type pump rotor is characterized in that a first rotor and the first rotor are in central symmetry about the rotor shaft rotation center # imgabs0 # of the first rotor, and the upper half portion rotor profile of the first rotor comprises a long-amplitude epicycloid # imgabs1 #, a tooth crest arc # imgabs2 # with the radius being R, a conjugate curve # imgabs3 # and an epicycloid # imgabs4 #; the first rotor is a tooth root arc # imgabs5 # with the radius of r, and the rotor profile of the upper half part of the first rotor is composed of two epicycloids, two arcs and a conjugate curve, so that it is guaranteed that gas can be compressed, and leakage is reduced; the air tightness and the volume utilization coefficient of the pump are improved; the rotor molded line of the first rotor and the rotor molded line of the second rotor are consistent, the molded lines are self-meshed, only one molded line needs to be machined and programmed, and manufacturing is convenient.

The invention discloses an asymmetric double-screw rotor molded line, and relates to the technical field of computer-aided geometric design and double-screw rotor molded line design. Each basic unit comprises a half section of driving screw root circular arc, a section of Bezier curve, a section of epicycloid and a half section of driving screw addendum circular arc which are sequentially connected end to end in the clockwise direction, and after the basic units are subjected to symmetry and central symmetry, a driving screw rotor molded line is formed; the driven screw rotor profile is in a rotational symmetry graph, each basic unit comprises a half-section driven screw root circular arc, a section of line segment, a section of long-amplitude epicycloid, a section of optimized circular arc and a half-section driven screw addendum circular arc which are sequentially connected end to end in the clockwise direction, and the driven screw rotor profile is formed after the basic units are symmetrical and rotated. The invention provides a novel asymmetric double-screw rotor molded line which supports adjustment of tooth gaps and adjustment of sharp corner optimization.

A gear mechanism is provided with: an external tooth-shaped circular arc gear which is provided with M circular arc teeth and which rotates around a first central axis; and an external tooth-shaped non-circular-arc gear which is provided with N non-circular-arc teeth and which rotates around a second central axis separated from the first central axis by a predetermined distance (D). Each arc tooth of the outer tooth-shaped arc gear has an arc gear tooth tip portion and an arc gear tooth side portion which is located on the side portion of the arc gear tooth tip portion and has an arc shape with a radius r. Non-circular-arc teeth of the outer-tooth-shaped non-circular-arc gear have a non-circular-arc gear tooth tip portion and a non-circular-arc gear tooth side portion which is located on a side portion of the non-circular-arc gear tooth tip portion and which is in contact with the non-circular-arc gear tooth side portion, and the non-circular-arc gear tooth side portion is formed such that at least a part of the shape thereof is an offset epicycloid in which the non-circular-arc gear tooth tip portion and the non-circular-arc gear tooth side portion are offset from each other. The offset epicycloid is an offset epicycloid in which the drawn epicycloid is offset by a length r, where the fixed circle is an imaginary circle having a radius D * N / (M + N) centered on the second central axis, the movable circle is an imaginary circle having a radius D * M / (M + N) centered on the first central axis, and the drawing point is the center of the arc gear tooth side part.

The invention relates to a micro cycloidal-pin wheel speed reducer and an eccentricity calculation method of an eccentric wheel. The eccentricity calculation method of the eccentric wheel comprises the steps that the pin tooth reference diameter D1 of a cycloidal disc of the cycloidal-pin wheel speed reducer is determined according to the appearance of a harmonic speed reducer; deducing the initial range of the eccentricity DS1 of an eccentric wheel of the cycloidal-pin wheel speed reducer according to the curtate coefficient K1; wherein DS1 is equal to K1 * D1 / Z; z is the number of needle teeth; drawing a curtate epicycloid of the cycloid disc according to the curtate coefficient K1; the eccentricity DS1 corresponding to the curtate epicycloid in the initial range of the eccentricity DS1 is selected as the actual eccentricity of the eccentric wheel; machining of the cycloidal-pin wheel speed reducer is determined through design and calculation of the eccentricity of the eccentric wheel, so that when the cycloidal-pin wheel speed reducer completes transmission, the problems of transmission system resonance caused by too large eccentricity and insufficient torque caused by too small eccentricity are solved.

The present invention relates to a tool holder adapter (10; 110) for attaching a tool (80; 180; 280) to a machine tool by means of a pin (50; 150; 250; 350). The tool holder adapter (10; 110) has a neck structure (20) for inserting the pin (50; 150; 250; 350), in which an inner recess (30) extends from a tool side (WS10) along a longitudinal axis (LA30). For a robust and reliable fastening of a tool (80; 180; 280) and to facilitate high manufacturing precision, the inner recess (30) has a receiving cross-section perpendicular to the longitudinal axis (LA30), the basic shape of which corresponds to a polygon with at least five points (32), a hypocycloid with at least five points (32), a pericycloid or an epicycloid.The invention further relates to a suitable pin (50; 150; 250: 350) for attaching a tool (80; 180: 280) to a tool holder adapter (10; 110), a suitable tool (80; 180; 280) and a tool fastening system comprising the tool holder adapter (10; 110) and the pin (50; 150; 250: 350).

The present invention relates to a tool holder adapter (10; 110) for fastening a tool (80; 180; 280) to a machine tool by means of a pin (50; 150; 250; 350; 450). The tool holder adapter (10; 110) has a neck structure (20) for inserting the pin (50; 150; 250; 350; 450), in which neck structure an inner recess (30) extends from a tool side (WS10) along a longitudinal axis (LA30). For robust and reliable fastening of a tool (80; 180; 280) and to facilitate high manufacturing precision, the inner recess (30) has, perpendicular to the longitudinal axis (LA30), a receiving cross-section whose basic shape corresponds to a polygon having at least five vertices (32), a hypocycloid having at least five vertices (32), a pericycloid or an epicycloid. The invention further relates to a matching pin (50; 150; 250; 350; 450) for fastening a tool (80; 180: 280) to a tool holder adapter (10; 110), a matching tool (80; 180; 280) and a tool fastening system having the tool holder adapter (10; 110) and the pin (50; 150; 250; 350; 450).

The invention relates to a small-tooth-difference cycloidal ball speed reduction method which comprises the following steps: S1, inputting power through double eccentric shafts, and driving a first movable disc and a second movable disc with the phase difference of 180 degrees to perform compound motion; s2, first-stage speed reduction is formed through the composite motion of the first movable disc; s3, through pure rolling of the movable disc steel balls between the ball socket of the first movable disc and the ball socket of the second movable disc, transferring and balancing movement between the two movable discs; s4, the steel balls of the output disc are made to roll purely between the hypocycloid wave arc grooves of the second movable disc and the epicycloid wave arc grooves of the output disc through the compound motion of the second movable disc, and second-stage speed reduction is formed; and S5, the decelerated power is transmitted to an output flange through an output disc to be output. The transmission mechanism has the advantages that the steel balls are restrained to roll in the inner cycloid groove and the outer cycloid groove at the same time, the return difference of traditional gear meshing is fundamentally eliminated, absolute precise positioning in the transmission process is ensured, and the strict requirements of robot joints, precise machine tools and the like are met.

The invention relates to the field of screw vacuum pumps, and discloses a screw vacuum pump rotor and a screw vacuum pump thereof, which are characterized in that the molded line of the rotor consists of five sections of curves which are sequentially connected end to end, namely a screw tip circle AB with the radius of R, an eccentric Bernoulli lemniscate BC and a conjugate envelope line CD of the eccentric Bernoulli lemniscate BC in sequence in the anticlockwise direction, compared with an eccentric heart-shaped line, an eccentric Bernoulli lemniscate, a screw root circle DE with the radius of r, an extended epicycloid EA and an eccentric Bernoulli lemniscate have the advantages that the change rate of the curvature radius of the section AB is larger, the eccentric Bernoulli lemniscate is more adaptive to a screw vacuum pump rotor with the larger difference between the addendum circle radius and the root circle radius, and the transition between the two rotors is more stable; the eccentricity # imgabs0 # and the area utilization coefficient c of the eccentric Bernoulli lemniscate AB can be actively adjusted, the area utilization coefficient can be well improved, and the design parameter space of the screw vacuum pump rotor profile with the larger difference between the addendum circle radius and the dedendum circle radius is improved.

The invention discloses a three-section type conical screw rotor. The three-section type conical screw rotor is sequentially divided into an air suction section, a compression section and an exhaust section in the axial direction of a screw. The air suction section is uniform in section and screw pitch in the axial direction of the screw rod; the compression section adopts a variable cross section and a variable screw pitch along the axial direction of the screw rod; the exhaust section is uniform in section and screw pitch in the axial direction of the screw rod; the section width of the air suction section in the axial direction of the screw is larger than the section width of the exhaust section in the axial direction of the screw. The end face molded line equations of all the sections are the same, each section is formed by connecting and closing five sections of curves end to end, and the five sections of curves comprise an involute section AB, a tooth crest arc section BC, a long-amplitude epicycloid section CD, a tooth root arc section DE and a point conjugate curve section EA. The invention further provides the vacuum pump. The device provided by the invention can effectively reduce noise of the vacuum pump and reduce clearance backflow, thereby improving reliability, stability and service life of the vacuum pump.