32results about How to "High output stiffness" patented technology

The invention discloses an X, Y and theta plane three-freedom-degree precision positioning platform. The X, Y and theta plane three-freedom-degree precision positioning platform comprises piezoelectric ceramic, composite rhombus displacement amplification mechanisms, bridge type displacement amplification mechanisms, a motion platform and a fixing frame. The piezoelectric ceramic is installed in the composite rhombus displacement amplification mechanisms, and the four composite rhombus displacement amplification mechanisms are arranged in parallel and located at the four corners of the fixing frame; and the motion platform is located at the center of the fixing frame, and the two side faces of the motion platform are connected with the composite rhombus displacement amplification mechanisms located on the two sides of the motion platform through the two bridge type displacement amplification mechanisms. Through the combination of the four composite rhombus displacement amplification mechanisms and the two bridge type displacement amplification mechanisms, the X, Y and theta plane three-freedom-degree precision positioning platform has two transverse motion freedom degrees and one rotation freedom degree; and through combination of two-stage displacement amplification and different drives, three-plane-freedom-degree motion is achieved, the structure of the platform is simple and compact, and the output displacement is large.

The invention discloses an outer convex inner arbitrary gear difference cam rolling moving transmission internal-combustion engine, relating to the field of fuel gas power and belonging to a multi-cylinder internal-combustion engine. The invention provides a novel internal-combustion engine; eight cylinders are distributed on the periphery of an outer convex inner multiphase inner cam symmetrically in a ring shape, so that a resultant force of the outer convex inner multiphase inner cam is zero; each cylinder piston directly acts on the outer convex inner multiphase inner cam through a push rod; and power is transmitted to an output shaft connected with a central wheel key by the outer convex inner multiphase inner cam through arbitrary gear difference inner cam rolling moving movable gear transmission. With the adoption of the internal-combustion engine, a connecting rod and a crank shaft in the traditional internal-combustion engine are saved; an outer convex multiphase inner cam rolling moving transmission mechanism has the characteristics of having no eccentric mass, and having an inertia force and working load self-balancing; the rotating speed of the output shaft depends on transmission ratio of movable gear transmission; when a movable gear frame is fixed, output by a central wheel is in low speed and large torque; and the internal-combustion engine can be widely applied to the fields of high-power engineering machinery and military and the like, such as excavators and armored cars. The internal-combustion engine is simple and compact in structure, small in axial size, self-balancing in stress, and stable in rotating.

The invention relates to a variable-rigidity joint, in particular to a variable-rigidity joint based on characteristics of torsional springs. The variable-rigidity joint aims at solving the defects that in the prior art, energy saved by an existing rigid joint is not enough, variable-rigidity performance cannot be ensured easily and the variable-rigidity range is small, and aims at solving the problems that in the rigidity regulation manner that the position of a fulcrum is moved based on the lever principle, energy consumption generated when the fulcrum conducts sliding friction in a groove is large, the number of required parts is large and the structural design is not reasonable. The variable-rigidity joint comprises the set of torsional springs, a slide block, a slide rail, a first output plate, a second output plate, an input plate, an input plate rotating shaft, two rollers, a set of torsional spring supports and two connection pieces. The set of torsional springs include the first torsional spring and the second torsional spring. The set of torsional spring supports include the first torsional spring support and the second torsional spring support. The first output plate, the second output plate and the input plate are all disks. The variable-rigidity joint is used for the field of robot joints.

The invention discloses a smooth variable-stiffness driver for a lower limb exoskeleton. The driver comprises a support assembly, an outer shell assembly, a spring assembly, a driving assembly and a roller assembly, wherein the outer shell assembly and the roller assembly keep synchronous movement. According to the driver, a linear spring is compressed in a non-linear manner by using a pair of gear structures, so that the smooth variable stiffness characteristic of the output torque is realized. The driver can be applied to hip joints and knee joints of the lower limb exoskeleton.

The invention relates to a convex inner two-phase cam rolling shifting transmission internal-combustion engine, relates to the field of fuel gas power, and belongs to a multi-cylinder internal-combustion engine. The invention provides a novel internal-combustion engine, the novel internal-combustion engine is characterized in that eight air cylinders are symmetrically distributed on the periphery of a convex inner two-phase cam in an annular manner, the resultant force of the convex inner two-phase inner cam is zero, an air cylinder piston is directly acted on the convex inner two-phase inner cam through a push rod, and power is passed on an output shaft connected with a center wheel in a key manner through the convex inner two-phase inner cam and the transmission of two-phase inner cam rolling shifting live teeth. The internal-combustion engine omits a connecting rod and a crank shaft in the traditional internal-combustion engine, and the internal-combustion engine has the characteristics that a convex inner two-phase inner cam rolling shifting transmission mechanism has no eccentric quality, has inertia force and operating load self balancing. The rotation speed of the output shaft depends on the transmission ratio of live teeth transmission, if a live teeth frame is fixed, the low speed high pulling torque of the center wheel outputs, and the convex inner two-phase cam rolling shifting transmission internal-combustion engine is widely applied on fields which need large power such as a project machine, military, excavators and armored cars. The internal-combustion engine provided by the invention has the advantages that the structure is simple and compact, the axial size is small, the stressing is in self balancing, and the operation is smooth.

Disclosed is a large-displacement high-frequency-response three-degree-of-freedom piezoelectric driving precise locating platform. The locating platform comprises a rigid base. The two sides of the rigid base are connected with one first rigid output end of a rhombus displacement amplifying mechanism. The other first rigid output end of the rhombus displacement amplifying mechanism is connected with one second rigid input end of a bridge-shaped displacement amplifying mechanism. Piezoelectric ceramics are connected to two first rigid input ends of the rhombus displacement amplifying mechanism. The rhombus displacement amplifying mechanism forms a flexible mechanism based on the triangulation principle through connection of a flexible arm, the two first rigid input ends and the two first rigid output ends. The bridge-shaped displacement amplifying mechanism is an arch-bridge-shaped flexible mechanism composed of two flexible beams, two second rigid input ends and a first second rigid output end. The two symmetrical flexible beams form bevel edges of the bridge-shaped displacement amplifying mechanism. Through the locating platform, large-stroke high-bandwidth high-precision displacement output can be achieved, and the structure is simple and compact.

The invention discloses a parallel alignment platform based on a flexible parallelogram mechanism and provided with a remote rotating center. The parallel alignment platform comprises a base, a pre-tightening screw, a capacitive sensor, a sensor support, a cover plate, a platform base plate, a movement transmission mechanism, a piezoelectric ceramic driver and a gasket. The cover plate, the movement transmission mechanism, the platform base plate and the base are arranged in the thickness direction. The base and the movement transmission mechanism are fixedly installed through a screw. The pre-tightening screw is installed on the cover plate and makes contact with the gasket. The piezoelectric ceramic driver and the gasket are installed between the movement transmission mechanism and the platform base plate. According to the designed parallel alignment platform, through a dual-lever amplifying mechanism and a dual-parallelogram guide mechanism in the movement transmission mechanism, the parallel alignment function of rotation around a remote center can be achieved.

The invention relates to a rotation speed protection adjustment device of a self-contained steam turbine, and belongs to the technical field of rotation speed protection adjustment of steam turbines. The device comprises an integrated electro-hydraulic actuator, a speed measurement device, a controller, a steam adjustment valve, a steam bypass valve, and an oil pipeline, wherein a sensor of the speed measurement device is mounted on a gear on the bottom of the steam turbine; the controller is connected with the electro-hydraulic actuator by a control signal line; the integrated electro-hydraulic actuator is connected with the steam bypass valve by a soft oil pipe and connected with the steam adjustment valve by the soft oil pipe; the steam adjustment valve is connected with the steam inlet side of the steam turbine, the steam turbine is bypassed with the steam adjustment valve by the steam bypass valve, and two ends of the steam bypass valve are connected with the steam inlet and the steam outlet respectively. The device has features of simple and compact structure, strong interference resistance, fast dynamic response, high output rigidity and high positioning accuracy, and such as installation and debugging are easy to standardize and the complexity degree of the related work is high.

The invention discloses an arbitrary-tooth difference rolling transmission internal combustion engine, and relates to the field of gas power. According to a novel internal combustion engine, eight cylinders are annularly, symmetrically and uniformly distributed around an outer cam inner gear ring, so that resultant force on the outer cam inner gear ring is zero; and pistons of the cylinders directly act on the outer cam inner gear ring through pushrods, and power is transmitted to an output shaft in key connection with a multi-phase outer cam in a multi-phase outer cam impact wave rolling oscillating tooth transmission way through the outer cam inner gear ring. According to the internal combustion engine, a connecting rod and a crankshaft in the conventional internal combustion engine are eliminated, a multi-phase outer cam impact wave rolling transmission mechanism has the characteristics of no eccentric mass and self-balance of inertia force and a working load, the rotating speed of the output shaft is determined by the transmission ratio of oscillating teeth, and if an oscillating tooth rack is fixed, the output of the multi-phase outer cam is realized at high speed. The internal combustion engine can be widely applied to fields with requirements on high rotating speed, such as a helicopter engine and a miniature generator, and when the output rotating speed is fixed, the emissions of harmful gases can be reduced. The internal combustion engine is simple and compact in structure and small in axial size, has a force self-balancing function, and can run stably.

The invention discloses a two-phase shock wave swing link movable-teeth compound transmission speed reducer and relates to the technical field of mechanical transmission. The compound transmission speed reducer mainly comprises a two-phase shock wave device, movable teeth, a swing link, a pin shaft, a movable-teeth frame, a central wheel and a fixed axis gear train which is embedded into the shock wave device. The exterior of the shock wave device has a cam profile and the interior of the shock wave device has an inner gear ring profile; an input gear is engaged with a pinion and the pinion is engaged with the inner gear ring so as to form the fixed axis gear train; the input gear and an input shaft are integrated; the rotation of the input gear is decelerated through the fixed axis gear train and drives the shock wave device to rotate; the shock wave device and the movable teeth are in rolling contact engagement, so that the movable teeth swing along with the swing link and moves along the tooth profile of the central wheel simultaneously; and the shock wave device and the central wheel coact to make the movable teeth drive the movable-teeth frame to rotate and output power through the swing link. By setting pre-deceleration in swing link movable-teeth transmission, the transmission ratio is increased, and the problem of over-high temperature rise of movable-teeth transmission is also solved; and the speed reducer has the advantages of novel and compact structure, high bearing capacity, self-balancing stress and the like, and is suitable for decelerating transmission between two coaxial shafts.

The invention relates to the technical field of micro-nano machining and manufacturing devices, in particular to a multi-degree-of-freedom nanometer positioning platform based on a flexible parallel mechanism. Branch movement chains include a first branch movement chain and a second branch movement chain; one end of the first branch movement chain is connected with a first fixed base, and the other end of the first branch movement chain is connected with an end executor; and one end of the second branch movement chain is connected with the first fixed base, a supporting point is provided by asecond fixed base, and the other end of the second branch movement chain is connected with the end executor. The end executor can realize single-degree-of-freedom output through the multi-axis secondbranch movement chain in a vertical direction; through redundant driving with the nanoscale precision, high output rigidity, high acting force, large load capacity, high bandwidth and high precision in the vertical direction can be realized; and the platform can be used as a main shaft in the fields of micro-nano machining and manufacturing, and the like.