The present invention relates to a mechanical reduction gearing (1) comprising: —an input shaft (3), —a sun gear (5) coupled in rotation to the input shaft (3), —a planet carrier (7) rotatable with respect to the input shaft (3) and supporting an output shaft (74) coaxial with the input shaft (3), said planet carrier (7) comprising at least one planet shaft (s1, s2, s3) extending parallel to the input shaft (3), —at least one cam (13) arranged around the planet shaft (s1, s2, s3) and comprising a first axial portion (p1) concentric to the planet shaft (s1, s2, s3) and at least one second eccentric axial portion (p2, p3), said at least one planet shaft (s1, s2, s3) being mounted rotatably with respect to the planet carrier (7) and/or said at least one cam (13) being mounted rotatably with respect to the associated planet shaft, —at least one planet gear (15) coupled in rotation to the cam (13) at its first concentric axial portion (p1) and configured to engage with the sun gear (5), —a peripheral annulus (17) arranged concentrically to the input shaft (3) and comprising an inner toothing, —at least one toothed wheel (r1, r2) intended to engage with the inner toothing of the peripheral annulus (17) and comprising at least one through-orifice offset with respect to the centre of the toothed wheel (r1, r2) and configured to cooperate with the second axial portion (p2, p3) of the cam (13) such that the rotation of the cam (13) causes the toothed wheel (r1, r2) to roll against the peripheral annulus (17), said rolling movement of the toothed wheel (r1, r2) being accompanied by the rotation of the planet carrier (7) with respect to the input shaft (3), and wherein the toothings of the peripheral annulus (17) and of the at least one toothed wheel (r1, r2) are toothings in the form of an involute to a circle.

A speed reducer comprises a sleeve-shaped rotation member, a rear carrier, a front carrier, three driving assemblies, a third bearing set, a fourth bearing set, and three wheels. When a shaft of a motor inserts into the front central through hole, each axial hole of each wheel, and the rear central through hole and then drives each driving assembly to rotate, the first bearing set and the second bearing set both operate to an inner peripheral of each corresponding through hole of each wheel and the outer rollers of each wheel drive the inner rollers of the sleeve-shaped rotation member due to the eccentric arrangement of the first rod section and the second rod section of the eccentric rod so as to drive the sleeve-shaped rotation member to rotate and then achieve the effect of reducing speed.

Disclosed is a precision rotational transmission mechanism, comprising a fixing support (1), wherein the fixing support (1) is provided with a rotational case (112), which is connected to an electric motor and is provided with a first transmission mechanism (1122), a second transmission mechanism (33) and an output member (10) therein, an end of the first transmission mechanism is connected to motor, the other end is connected to the second transmission mechanism, and the second transmission mechanism drives the rotational case to rotate simultaneously via the output member. The transmission mechanism has a simple and compact structure, has a larger output shaft which has bigger rigidity and can output from two ends has a lighter overall weight which is suitable for industrialization and mass production, has a large transmission ratio, high transmission efficiency, small return difference, strong carrying capacity, strong impact resistance capacity, and long service life.

A rotary actuator (101) is provided which includes first and second opposing endplates (107); a stator (105) having a first end which is attached to said first endplate, and a second end which is attached to said second endplate; a rotor (103) having first and second eccentrics (125) on a surface thereof; an output attachment ring gear (135) disposed about the periphery of said first and second opposing endplates; a first parallel eccentric gear (131) which is disposed between said first eccentric and said output gear and which meshes with said output gear; a second parallel eccentric gear which is disposed between said second eccentric and said output gear and which meshes with said output gear; a first crosslink (113) which engages said first endplate and said first eccentric gear by way of a first set of surface features (143, 153); and a second crosslink which meshes with said second endplate and said second eccentric gear by way of a second set of surface features.

A multi-speed transmission (01) having a px and having a zx is described. The px is equipped with a sun wheel (84) and at least one planet wheel (08). The cycloidal gear stage equipped with a ring gear (02) with a ring gear axis (20), at least one cycloidal disk (05, 06) rolling in the ring gear, with at least one off-center opening and with a number, equivalent to the number of planet wheels (08), of shared off-center eccentric shafts (03), each connected nonrotatably with a planet wheel (08) and located jointly rotatably around the ring gear axis (20) and having a number of eccentric portions (31, 32), equivalent to the number of vbs (05, 06), which are each supported rotatably in a respective off-center opening of the at least one cycloidal disk (05, 06). The transmission (01) is distinguished by a support of its gear stages relative to the ring gear (02), also called and/or capable of being called a load-bearing body and being for instance at least a part of its machine frame, with bearing elements located exclusively on one side of the ring gear (02). First molding surfaces (33) are embodied on the eccentric shafts (03), and second molding surfaces (82) are embodied on the planet wheels (08), with which molding surfaces the planet wheels (08) mesh with the first molding surfaces (33) on the eccentric shafts (03).

To increase strength without any weight increase due to a thickness increase and without causing the machining problem in half-blanking, an external gear and an internal gear are ring-shaped gears, and external teeth and internal teeth each have a tooth width substantially corresponding to the thickness of an outer circumferential surface of the external gear or an inner circumferential surface of the internal gear. The external gear and the internal gear are ring-shaped gears, that is, each can be formed through the punching of a plate, and strength resulting from the engagement of the external teeth and the internal teeth corresponds to strength resulting from the thickness of the material plates forming the external gear and the internal gear. Accordingly, the external teeth and the internal teeth can have a wider tooth width, achieving higher strength than when half-blanking is used.

A nutational cycloidal reducer reduces an input speed to an output speed by a reduction ratio. The reducer includes a timing ring having an internal wall with a series of longitudinally extending tooth profiles, an output connected to the timing ring, a pulley having a central opening, a series of longitudinally extending tooth profiles and a plurality of circumferentially disposed pin bores. An input shaft has first and second shaft portions. The first portion is concentric with a longitudinal axis and the second portion is eccentric to the axis. A plate has a central opening. The pulley is positioned in the timing ring with some of the pulley and timing ring tooth profiles engaged with each other. The second shaft portion is positioned in the pulley and the plate and drives the pulley in a nutational movement. The pulley has one or more less tooth profiles than the timing ring, such that the reduction ratio is defined by # of timing ring tooth profiles/(# of timing ring tooth profiles−# of pulley tooth profiles).

The present invention provides a transmission roller, a pin-teeth cycloid reducer with the same and a bearing. The transmission roller comprises a hollow roller which is made by spirally and closely winding a steel strip or a steel wire, and the length of the hollow roller remains unchanged when both ends thereof distributed along the axial direction are squeezed. When the hollow roller is subjected to external pressure, the ends thereof will not be easily damaged, and will not extend to the middle part during use, thus having a long service life.

A speed reduce according to an embodiment of the present invention includes a case having an outer diameter D, a plurality of crankshafts, and a carrier supporting the crankshafts in a rotatable manner. The carrier is rotatable by the crankshafts relative to the case. Each of the plurality of crankshafts includes a plurality of eccentric members each of which has a diameter dc1 and a crank journal that has a diameter dc2. The crankshaft further includes n1 needles that are arranged around each of the plurality of eccentric members and each of which has a diameter size dr1, and n2 needles that are arranged around the crank journal and each of which has a diameter size dr2. In the speed reducer, relational expression 5.5≤D/dc1≤7.0 is satisfied.

A speed reducer according to one embodiment of the present invention includes a crankshaft and a speed reducing mechanism. The crankshaft includes a gear portion driven by rotation from a drive source and a journal portion formed integrally with the gear portion. The crankshaft rotates about an axis of the journal portion. The speed reducing mechanism decelerates rotation of the crankshaft and outputs the decelerated rotation.