1982results about "Portable lifting" patented technology

A feeder housing shaft sprocket segment comprising: a sprocket segment body (300) extending in a circumferential direction around a center axis (A) from a leading edge (304) to a trailing edge (306), wherein the leading edge (304) and trailing edge (306) subtend a segment angle about the center axis (A), the segment angle being a first unit fraction of 360°; an outer sprocket perimeter (308) comprising a plurality of teeth (310) evenly arranged in the circumferential direction about the center axis (A) with each tooth (310) spaced by a tooth angle from each adjacent tooth (310), the tooth angle being a second unit fraction of 360°; and a plurality of engagement surfaces (312) extending towards the center axis (A) and facing in the circumferential direction (C), the plurality of engagement surfaces (312) being asymmetrical relative to a plane (P) defined by the center axis (A) and a radial projection from the center axis (A) that bisects the sprocket segment body (300) midway between the leading edge (304) and the trailing edge (306).

Methods and apparatus for a composite bicycle front sprocket are disclosed herein. One embodiment discloses a composite bicycle front sprocket assembly having an outer assembly of a first material. The bicycle front sprocket assembly also has a center assembly of a second material. The center assembly is disposed at least partially within the outer assembly. The center assembly is irremovably coupled with the outer assembly. The center assembly is irremovably coupled with the outer assembly without an external fastening device to irremovably couple the center assembly with the outer assembly.

The utility model relates to the technical field of gear boxes, in particular to a gear box for a high-power ocean vessel. The gear box comprises a box body, a PTO shaft, a gear shaft, a clutch oil cylinder and an output shaft are rotationally installed in the box body, the PTO shaft is in transmission connection with the clutch oil cylinder, the clutch oil cylinder is connected with the gear shaft through a clutch, an output gear is arranged on the output shaft and comprises an outer gear ring and an installation disc, and the installation disc is detachably connected to the inner side of the outer gear ring. The outer gear ring is connected with the gear shaft in a meshed mode, and a plurality of weight reduction grooves are formed in the installation disc. During use, the clutch oil cylinder drives the gear shaft and the output shaft to rotate through the clutch to provide power for advancing of a ship. Meanwhile, the clutch oil cylinder drives the PTO shaft to rotate so as to drive an external generator to generate electricity. The split type design is adopted for the output gear, the weight reduction groove is formed in the installation disc, the high-power transmission requirement can be met, the overall weight of the output gear is lighter, and the output gear is easier to assemble and disassemble.

The invention relates to a light-weight type planetary line gear reducer which comprises a sun gear, a planetary gear, an inner gear ring and a planetary carrier which are all light-weight type line gears, the sun gear is located in the center of the inner gear ring, the sun gear and the planetary carrier are both coaxially and rotationally installed on the inner gear ring, and the planetary gear is installed on the planetary carrier in a heteroaxial rotation mode and can rotate around the axis of the planetary gear. And the tooth surface normal of any contact point of the planet gear is collinear with the tooth surface normal of the corresponding contact point of the sun gear and the inner gear ring at the same time, the contact line is a cylindrical spiral line, and the transmission ratio and the spiral radius are decoupled. Through the space curve meshing theory, the reduction ratio exceeding 30 can be achieved through a single stage, the stage number of the planetary reducer is reduced, the force flow transmission path is remarkably shortened, the overall weight is reduced, and meanwhile the bearing capacity and reliability are improved; the technical problems that in the prior art, when the large reduction ratio is achieved, the multi-stage series connection structure is complex, the weight is increased, the transmission and positioning precision is reduced, and the load dispersing capacity is limited are systematically solved.

The high-strength flexible gear comprises a cylinder and a cylinder bottom flange, the cylinder comprises a gear ring section and a cylinder section, a fillet transition section is arranged between the cylinder section and the cylinder bottom flange, and a plurality of reinforcing ribs evenly distributed around the circle center of the cylinder section are arranged on the inner wall of the cylinder section. The reinforcing ribs extend to the position, corresponding to the tail end of the gear ring, of the inner wall of the barrel body from the fillet transition section so as to enhance the overall strength of the flexible gear, the rigidity of the inner wall of the barrel section of the flexible gear is remarkably improved through introduction of the reinforcing ribs, and the reinforcing ribs are arranged on the inner wall of the barrel section and extend to the position, corresponding to the tail end of the gear ring, of the inner wall of the barrel body from the fillet transition section. The reinforcing ribs are evenly distributed around the circle center of the cylinder section and extend to the position, corresponding to the tail end of the gear ring, of the inner wall of the cylinder body from the fillet transition section, a stable supporting network is formed, and assembly prestress generated when the wave generator is installed in a flexible gear is dispersed and reduced. Therefore, the risk of local plastic deformation or breakage of the flexible gear due to uneven stress is reduced.

The utility model relates to the technical field of equipment disassembly, and discloses a disassembly tool which comprises a fixed seat, a mounting structure is arranged on the fixed seat, and the mounting structure is suitable for clamping at least part of the fixed seat to the top of an integrated cabinet; a sliding assembly; the hoisting assembly comprises a pulley assembly and a traction piece. According to the disassembling tool, in the field environment, even if a foundation is a stone muddy road surface and the carrying space is limited, transportation and stable installation can be guaranteed, the position of the hoisting assembly can be flexibly adjusted, a converter can be conveniently hoisted at different positions, and the disassembling tool is suitable for various complex field layouts; according to the utility model, the traction piece can be operated manually, so that the problem that an electric tool cannot be used due to inconvenience in on-site electricity taking is avoided, the cost of the tool is greatly reduced, and the tool is convenient to carry and operate.

A stator ring-internal gear assembly for a transmission device comprising a planetary gear of a wheel hub drive for a vehicle, the assembly may include a stator ring of an electrically operable electric motor device of the wheel hub drive for providing a motor torque and an internal gear of the transmission device for translating the provided motor torque into a net torque. The stator ring and the internal gear may be directly fixed to one another by positive connection in a non-rotatable and tension-resistant manner. The stator ring and the internal gear may form a mono-lithic unit.

The invention provides a combined flexible gear, a harmonic reducer and a robot, the combined flexible gear comprises a gear ring and a connecting flange, the gear ring comprises a flexible gear cylinder and flexible gear teeth formed on the cylinder wall of the outer side of the flexible gear cylinder, the connecting flange comprises a flange ring and a connecting cylinder located on the end face of one side of the flange ring, and the connecting cylinder is located on the end face of the other side of the flange ring. A first port of the connecting cylinder is in coaxial butt joint with a first port of the flexible gear cylinder, the gear ring and the connecting flange are made of different materials, and the connecting flange is made of high-toughness aluminum alloy materials. Fatigue tearing at the corner position of the connecting flange is avoided, so that the service life of the flexible gear is remarkably prolonged; the gear ring does not have a limiting obstacle of a connecting flange, cutters and clamps with general specifications can be selected in the machining process, and the cost of machining the cutters and the clamps is reduced; as the gear ring and the connecting flange are separately machined, the machining efficiency of the flexible gear can be improved, and the machining difficulty is reduced.

The utility model relates to the technical field of chain wheels, and discloses a fast-assembly positioning chain wheel which comprises a first fan-shaped chain wheel disc and a second fan-shaped chain wheel disc, the first fan-shaped chain wheel disc and the second fan-shaped chain wheel disc are attached to each other to form a complete chain wheel disc, and a plurality of chain teeth are arranged on the surfaces of the outer ends of the first fan-shaped chain wheel disc and the second fan-shaped chain wheel disc respectively. Connecting cylinders are attached to the centers of the surfaces of the first fan-shaped chain wheel disc and the second fan-shaped chain wheel disc respectively, sleeves are connected to the other ends of the connecting cylinders respectively, the connecting cylinders are stably connected with the chain wheel discs through fixing discs, fixing pins and nuts and accurately positioned, the stability of the chain wheel during high-speed rotation is ensured, faults caused by deviation of the connecting parts are avoided, and the service life of the chain wheel is prolonged. And meanwhile, the arc-shaped plate in the connecting cylinder can be flexibly adjusted through the rotating head and can be rapidly matched with sleeves of different sizes, the arc-shaped plate can be rapidly installed and stably run no matter in standard equipment or customized equipment, high universality is shown, and the equipment adaption cost is reduced.

The invention discloses a straight tooth extrusion wheel for internal spline inverted conical teeth and a machining method for the internal spline inverted conical teeth, and belongs to the technical field of mechanical product machining. The method comprises the following steps: broaching a to-be-processed workpiece to form an internal spline straight tooth structure; the straight tooth structure of the internal spline is subjected to inverted conical tooth extrusion machining, and metal allowance generated by extrusion deformation synchronously flows to the tooth side area and the small-diameter area of the internal spline; a straight tooth extrusion tool matched with an inverted conical tooth extrusion tool is adopted, secondary extrusion machining is conducted on the straight tooth area of the internal spline, and metal allowance flowing to the tooth side area of the internal spline is completely transferred to the small-diameter area; and the small-diameter area of the internal spline is machined, a bulge structure formed by the transferred metal allowance is removed, and machining of the reverse taper teeth of the internal spline is completed. Secondary gear burnishing is used, the small-diameter allowance is removed through follow-up machining, and the problem that the machining cost of an original internal spline reverse taper gear is too high is solved.

Disclosed is a rack and pinion drive apparatus (100). The rack and pinion drive apparatus (100) includes a pinion (102) provided with a number of pinion teeth (108) such that each pinion teeth of the plurality of pinion teeth (108) comprises a top land (202) and a bottom land (204). A rack (104) provided with a number of rack teeth (106) such that a set of rack teeth of the plurality of rack teeth (106) includes a rack chamfered edge (112). The top land (202) of each pinion teeth of the number of teeth (108) includes a pinion chamfered edge (202A) such that the pinion chamfered edge (202A) is configured to engage with the rack chamfered edge (112) of the set of rack teeth of the number of rack teeth (106) to facilitate meshing of the plurality of pinion teeth (108) with the number of rack teeth (106).

A display device includes a first housing, a second housing, a roller, a pulley assembly, a stressed member, and a flexible display panel. The first housing includes a fixed portion and a sliding portion slidably connected to the fixed portion. The second housing is fixedly connected to a side of the fixed portion away from the sliding portion, and an angle between the first housing and the second housing is less than 180 degrees. The roller is disposed between the first housing and the second housing, and the roller is rotatably connected to at least one of the first housing and the second housing. The pulley assembly comprises a pulley block in the first housing, and a tension belt wound around the pulley block, and the pulley block is respectively connected to the fixed portion and the sliding portion.

The utility model discloses a structure-enhanced mute miniature speed-reducing planetary gear box which comprises a box body, a planetary gear ring and a planetary gear assembly. An accommodating cavity is formed in the box body; the planetary gear ring is fixed in the containing cavity, and the planetary gear ring and the planetary gear rotate in a meshed mode to drive the support shaft to rotate; an isolation cavity is formed between the outer wall of the planetary gear ring and the inner wall of the containing cavity, the purpose of forming the isolation cavity through the double-layer structure is to isolate sound from being transmitted outwards, the sound insulation effect is achieved, sound absorption sponge can be assembled in the isolation cavity, and when the sound requirement standard is higher, the sound absorption sponge can be assembled in the isolation cavity to absorb sound, and the better mute effect is achieved. The box body is made of the zinc alloy material, so that the structural strength of the product is effectively enhanced, the planetary gear ring is made of the plastic material, the isolation cavity is formed between the outer wall of the planetary gear ring and the inner wall of the containing cavity in a matched mode, and the sound absorption sponge can be placed in the containing cavity, so that noise generated during operation is effectively reduced, and the silence effect is achieved.

The invention provides a rigid gear and a harmonic reducer, and relates to the technical field of harmonic transmission. The rigid gear comprises a rigid gear body and rigid gear teeth; rigid gear teeth are formed on the inner ring face of the rigid gear body. Cooling flow channels used for circulation of cooling media are formed in the rigid gear body and distributed in the circumferential direction of the rigid gear teeth. According to the rigid wheel, the hollow cooling flow channels are formed in the rigid wheel body, the cooling flow channels are directly formed in the rigid wheel and distributed in the circumferential direction of the rigid wheel teeth, the rigid wheel has the advantages of being extremely short in heat transfer path and small in heat resistance, heat can be rapidly taken away from the source, and the service life of the rigid wheel is prolonged. In other words, the heat emitting position can be directly and efficiently cooled from the inside through flowing of the cooling medium, the heat dissipation performance of the harmonic reducer is remarkably improved, and the problem of how to improve the heat dissipation performance of the harmonic reducer in the prior art is solved.

A composite gear (100) includes an annular metallic gear hub (102) including a bore (104) and defining a central axis (106) of the composite gear (100). The composite gear (100) includes a composite web (108) disposed circumferentially around the annular metallic gear hub (102) with respect to the central axis (106). The composite gear (10) includes a metallic gear rim (112) disposed circumferentially around the composite web (108) with respect to the central axis (106). The metallic gear rim (112) includes an annular portion (114) disposed adjacent to the composite web (108) and a plurality of gear teeth (116) angularly spaced apart from each other with respect to the central axis (106) and extending outwardly from the annular portion (114) distal to the composite web (108). The composite gear (100) includes an interface (118) disposed between the metallic gear rim (112) and composite web (108). The composite web (108) has a plurality of fibres (110) comprising a set of first fibres (110A) and a set of second fibres (110B) intersecting with the set of first fibres (110A) and inclined to the set of first fibres (110A) by an inclination angle (110C) from 30 degrees to 60 degrees, such that the set of first fibres (110A) and the set of second fibres (110B) together form a mesh (110D) or a woven fabric (110E).

The invention provides a roller, a driving device and a preparation method thereof.The roller comprises a threaded section, a first tooth part and a second tooth part, the threaded section is located between the first tooth part and the second tooth part, the first tooth part comprises first teeth, the first tooth part is provided with first tooth grooves in the circumferential direction of the roller, and the second tooth part is provided with second teeth in the circumferential direction of the roller; the first tooth part comprises a first tooth, the first tooth part comprises a first tooth and a second tooth, the first tooth groove is located between two adjacent first teeth, the second tooth part comprises a second tooth, the second tooth part is provided with a second tooth groove in the circumferential direction of the roller, and the second tooth groove is located between two adjacent second teeth; the first teeth and the second teeth are arranged in a staggered mode in the axial direction of the pin roller. The requirement on machining precision is reduced; the driving device comprises a shell, a driving assembly and an output assembly, at least part of the driving assembly is located in the shell, the driving assembly is connected with the output assembly, the output assembly comprises a sleeve, a pin roller and a lead screw, the sleeve is in threaded fit with the pin roller, the pin roller is in threaded fit with the lead screw, and the pin roller is in threaded fit with the lead screw. And according to the preparation method, a mold is adopted, forming, demolding and other processes are carried out, the pin roller is formed, demolding is convenient, and the machining precision requirement is lowered.

The invention relates to a worm gear (10) for an auxiliary drive, in particular for a steering gear of a motor vehicle, comprising the following features: - a worm (100) with helical teeth designed as globoid teeth or globoid-like teeth, - a worm wheel (200) meshing with the worm (100), - the teeth of the worm (100) have teeth (130) in at least one of its two axial edge regions (112, 114) with a tooth height (H2) that is lower than the height (H1) of the other teeth of the worm (100). The invention further relates to a worm for such a worm gear and a manufacturing method for such a worm.

A variety of transmission mechanisms are provided that include split pulleys nested within each other in order to reduce the size of the transmissions, to provide infinitely variable transmission ratios that include forward and reverse ratios, or to provide some other benefits. These transmissions include "W"-shaped belts, having both contact surfaces that are directed outward from the belt and inward, toward a center-line of the belt, to contact the pulleys with respective different inward- and outward-directed contact surfaces. Accordingly, the surfaces at which the belt contacts the different pulleys may be substantially the same with respect to a hinge or other structure of the belt. This improvement may permit higher levels of power transmission, increased efficiency, and increased transmission lifetime. Additionally, variable-eccentricity variable transmissions are provided wherein the eccentricity of rotation of an inner, nested pulley varies with changes in the transmission ratio of the transmission.

To provide a steel gear capable of reducing the coefficient of friction.SOLUTION: A steel gear (1) includes: a carburization quench-hardened layer formed on a front surface including tooth surfaces of a plurality of gear teeth (GT); and a core part being a part except the carburization quench-hardened layer. In the carburization quench-hardened layer, when defining an area having a depth of 10 μm from the tooth surface and a length of 50 μm in a tooth trace direction in a cross-section including a normal direction of the tooth surface and the tooth trace direction of the gear tooth (GT) as an outermost layer rectangle area, at least a part of the carburization quench-hardened layer has 7.0% or more of a {203} crystal orientation area ratio obtained by crystal orientation analysis in the normal direction in the outermost layer rectangle area.SELECTED DRAWING: Figure 1

The invention relates to an improved speed reducer which comprises a base body. The input shaft is rotatably arranged in the mounting cavity and is provided with a transmission wave surface of which the lower surface is fluctuant; the output shaft is provided with a first gear ring opposite to the transmission wave surface; an outer ring of the flexible gear is restrained in the mounting cavity, an inner ring of the flexible gear is clamped between the transmission wave surface and the first gear ring, and the lower surface of the inner ring is provided with a second gear ring which can be driven by the transmission wave surface to generate local deformation so as to be meshed with or separated from the first gear ring; the positioning piece is arranged close to the inner wall face of the base body, first positioning teeth are arranged on the top of the positioning piece, and second positioning teeth meshed with the first positioning teeth for limiting are arranged on the lower surface of the flexible gear outer ring. The meshing limiting between the flexible gear outer ring and the positioning piece increases the force transmission surface, and when the partial deformation of the flexible gear inner ring transmits the circumferential unbalanced force to the flexible gear outer ring, the force transmission and dispersion can be carried out by means of the meshing relationship, so that the stress of each part of the flexible gear positioning surface is uniform, and the problem of local cracking of the flexible gear is avoided.

The utility model discloses a differential self-locking mechanism, and relates to the technical field of mechanical transmission, the differential self-locking mechanism comprises a rotating shaft, a driven gear is mounted on the rotating shaft, and one side of the driven gear is engaged with a driving gear; the rotating shaft is provided with an external thread section, and the external thread section is connected with a pressing device used for adjusting the friction force between the driven gears. Wherein the driven gear comprises a first gear body and a second gear body, the first gear body is in sliding fit with the rotating shaft, and the second gear body and the rotating shaft are fixed and rotate synchronously; the modulus of the first gear and the modulus of the second gear are the same, the number of teeth of the first gear is at least one tooth smaller than that of the second gear, the base circle diameter of the first gear and the base circle diameter of the second gear are the same, and the reference circle diameter of the first gear and the reference circle diameter of the second gear are different. The differential self-locking device has the advantages that efficient transmission is kept when the electric actuator works, stability and reliability are improved by the aid of the gear circumference reversing principle in a self-locking state, and differential and high-precision self-locking effects are achieved.

A lifting assist device suitable for a calendering apparatus. When a foot pedal (2) is depressed, a movable pulley block and a pawl block (10) rise and drive a ratchet wheel (5) to rotate, and the ratchet wheel (5) drives a handwheel to rotate; when the foot pedal (2) is released, movable pulleys (8) and the pawl block (10) descend relative to the ratchet wheel (5) under the action of gravity, and the pawl block (10) is reset. By repeatedly depressing and releasing the foot pedal (2), a glass calender can be continuously lifted. When the glass calender is lifted into position, the lifting assist device is removed, operations such as inspection, maintenance and adjustment are performed, and finally the handwheel is rotated to lower the glass calender. Since the force of the human leg is several times that of the arm and the pulley block is used in conjunction, using the lifting assist device to drive the handwheel is much easier than rotating the handwheel by hand directly. The present invention can effectively solve the problem that current manual lifting of glass calenders is time-consuming and labor-intensive, thereby reducing the operational difficulty, increasing the lifting speed, and avoiding issues such as device failures and glass sticking to rollers caused by excessive accumulation of glass debris, and injuries resulting from improper operation.

The utility model relates to the field of belt pulleys, and discloses a wear-resistant belt pulley which comprises a belt pulley body, fixing grooves are formed in the two sides of the belt pulley body, reinforcing plates are fixed in the two fixing grooves, a plurality of cooling fins are fixed to the two sides of each reinforcing plate at equal intervals, and the cooling fins are distributed in an axial symmetry mode. Gaps exist between the cooling fins located on the inner sides of the reinforcing plates and the fixing grooves. The multiple cooling fins are fixed to the two sides of the reinforcing plates arranged in the fixing grooves in the two sides of the belt wheel body at equal intervals, the multiple cooling fins are distributed in the axial symmetry mode, the cooling fins can be evenly distributed around the belt wheel, the cooling area is effectively increased, when the belt wheel operates, air can flow through the surfaces of the cooling fins more smoothly, and the cooling efficiency is improved. The heat dissipation is accelerated, the working temperature of the belt pulley is effectively reduced, heat exchange with surrounding air can be more fully carried out, and the heat dissipation efficiency is higher.

The utility model relates to the technical field of precious metal smelting, in particular to a mounting structure for a driving part of a driving roller of a pressurized copper material removal banded extruder. The transmission mechanism comprises a main shaft, a mounted bearing, a chain wheel thrust ring, a chain wheel, a mounting seat, a gear, a labyrinth seal and a driving roller are sequentially mounted on the main shaft in a penetrating manner from left to right, the mounting seat is of an annular structure with a middle protrusion, the middle protrusion penetrates through the chain wheel, and the chain wheel is fixedly mounted on the mounting seat through a pin bolt and a pin nut. And a chain wheel thrust ring is arranged at the end part of the chain wheel, is fixed with the chain wheel through a bolt, and is movably connected with the mounting seat through a clamping groove. According to the installation structure, when overload torque is input into the chain wheel or a hard object is clamped between the driving roller and the driven roller meshed with the driving roller, the pin bolt is cut off, and therefore the spindle head of the spindle is protected against deformation. The utility model provides the structure which is easy to install, convenient to maintain, simple in structure and low in cost, and ensures that the pressurized copper material removal extruder stably runs for a long period.

A worm gear reducer capable of suppressing the occurrence of unpleasant abnormal noise due to metal-to-metal contact generated at locations other than an engaging portion between wheel teeth and worm teeth is provided. A worm 14 has an annular protruding portion 40 at a portion located on an inside in a radial direction of an inner ring 28, the annular protruding portion 40 having two contact end portions 41 at end portions on both sides in an axial direction of an outer circumferential surface thereof, the two contact end portions restricting further inclination of the worm 14 with respect to the inner ring 28 by coming into contact with an inner circumferential surface of the inner ring 28 when the worm 14 is inclined to a maximum inclination angle θmax, and each of the two contact end portions 41 composed of a convex curved surface.

The invention discloses a flexible transmission structure of a circular cooler. Comprising a flexible base, a driving component is arranged on the flexible base, and a transmission pin gear is arranged on an output shaft of the driving component. Self-adaptive adjustment of the driving component in the radial direction of the rotary body can be achieved, so that tight meshing of the transmission pin gear and the rotary body pin teeth is ensured. The device is high in impact load resistance, reliable in work, compact in structure and convenient to install and maintain.

The utility model relates to the technical field of ship equipment, in particular to an open pulley for a ship. The open pulley for the ship comprises a stainless steel frame body and a pulley body, the whole frame body is of a C-shaped structure, and the pulley body is connected to the lower portion in the frame body through a first fixing shaft. Protection plates matched with the pulley body are arranged on the two sides, located on the pulley body, of the frame body, and an opening for a cable to enter and exit is formed in the position, located between the C-shaped structure and the protection plates, of the frame body; one end of the first fixing shaft is of a rectangular structure, and the other end is fixed through nut threads. A hanging ring is fixed to the top of the frame body. According to the open pulley, the C-shaped frame body and the open design are adopted, a cable can laterally and rapidly enter the pulley, the operation efficiency is improved, the guide plate is additionally arranged, the cable can smoothly enter the pulley, abrasion is reduced, meanwhile, the limiting plate and the torsion spring are arranged at the opening, the opening can be automatically closed, and the cable is prevented from accidentally disengaging.

The utility model discloses an electric loop chain tightener. Comprising an upper lifting hook assembly, a lower lifting hook assembly, a loop chain and a wire tightening body fixedly connected to the upper lifting hook assembly. A transmission system, a driving mechanism, a manual operation structure for switching to a neutral gear, an electric cabinet and a shell are arranged in the wire tightening main body, and the shell is composed of a first wall plate, a second wall plate, a front cover and a rear cover. The transmission system is composed of a motor, a first gear shaft, a second gear shaft, a third gear shaft and a transmission mechanism. The switching structure is provided with a positioning locking block, a movable pull rod and a reset spring, a heart-shaped locking sliding way with a step structure is utilized, locking and releasing of a second transmission gear shaft at different positions are achieved, and then the meshing state of a second driven gear and a third driving gear is switched. The manual mode can be rapidly switched to the neutral gear manual mode when motor driving fails or a battery is insufficient or a switching state is needed, rapid closing of the loop chain is achieved, the operation process is simplified, and the safety, durability and use efficiency of the whole machine are improved.

The invention relates to an assembly (20) comprising a mechanical reduction gear unit (10) and a torque transmission shaft (4) for an aircraft turbine engine (1), the shaft (4) comprising a first radially outer annular collar (22) at one of the axial ends thereof, the reduction gear unit (10) comprising a one-piece planet carrier (13) and comprising two annular flanges (24, 26), characterized in that a first of the flanges (24) comprises a second radially outer annular collar (30) which is applied axially and fastened to the first collar (22) by fastening elements (32) which pass through orifices (34, 36) in the first and second collars (22, 30), and in that the second collar (30) has an outside diameter (D_ext) which is greater than a diameter (D_X1) of a toothing (14x) of the ring gear (14) of the reduction gear unit (10).