135 results about "Recirculating ball" patented technology

A self-retaining ball-worm and gear mechanism is provided to facilitate the rotational transmission of motion between two orthogonal but non-intersecting axes. A circuit of balls introduced as rolling elements indirectly couples the worm and gear, and eliminates the sliding friction characteristic of classical worm and gear mechanisms. The mechanism comprises a ball-worm (200), gear (202), and axial supports or housing (204). The ball-worm defines the ball circulation path. The worm helix is designed to retaining the balls such that no additional ball-retaining components are necessary. Magnetism may optionally or additionally be employed to attract the metal balls to the worm body, further enhancing ball self-retention. The gear comprises a plurality of grooves designed to engage the helix of balls on the worm. The path of the worm helix is mathematically accurate so that balls simultaneously engage multiple gear grooves, increasing the torque load capabilities of the device.

The invention relates to a recirculating-ball electric power-assisted steering system with variable transmission ratio for a bus, belonging to the field of steering systems for buses. The system sequentially comprises a steering wheel, a steering column, a torque transducer, a power-assisted motor, a first retarding mechanism connected with the power-assisted motor, a recirculating-ball steering gear, a steering rocker shaft arm, a steering tie rod and a steering system control ECU, wherein a second retarding mechanism and a corner motor driving the second retarding mechanism are arranged between the torque transducer and the recirculating-ball steering gear. The corner motor control integrates the ideal transmission ratio control with the stability control for carrying additional corner control, thereby changing the transmission ratio from a steering wheel corner to a front wheel corner, and increasing the function of the steering wheel in the stability control; meanwhile, steering counter torque complementation control caused by the additional corner is integrated into the power-assisted control of the power-assisted motor, thereby realizing the coordination control and the matching of the corner motor and the power-assisted motor and ensuring that a driver obtains better steering handfeel.

The invention relates to an electric hydraulic steering device for a commercial vehicle and belongs to the field of automobile power-assisted steering gears. The electric hydraulic steering device is composed of a recirculating ball steering gear, an intermediate shaft, a spindle, a worm gear, a worm, a sensor, a supporting seat, a motor and a controller, an intermediate shell is fixedly mounted on one side of a connecting valve of the recirculating ball steering gear through a connecting screw, the spindle is mounted in the intermediate shell through a bearing A, one end of the spindle is connected with an input shaft key of the recirculating ball steering gear while the other end of the same extends to the outer end of the intermediate shell, the intermediate shaft is movably mounted on the spindle in the intermediate shell in a sleeving manner and connected with a steering screw of the recirculating ball steering gear. When a vehicle runs normally, the motor and hydraulic power assistance work jointly, so that hydraulic power assistance needed during steering is reduced and the objective of saving energy is achieved; an electronic control unit (ECU) does not provide or provides small electric power assistance according to vehicle speed signals at a high speed, so that requirements on driving stability and safety are met.

The invention relates to an electrical push rod type electrical power-assisted steering device, which comprises a recirculating ball steering gear provided with a torque sensing device, an electrical push rod and an electronic control unit, wherein the torque sensing device is used for detecting moment acted on a steering wheel, and is arranged on an input shaft of the recirculating ball steering gear. One end of the electrical push rod is connected with a steering rock arm, and the other end of the electrical push rod is connected with a vehicle frame. The electrical push rod comprises a power-assisted motor and a speed reducing mechanism, a push rod and so on. An input shaft of the speed reducing mechanism of the power-assisted motor is connected with an output shaft of the power-assisted motor, an output shaft of the speed reducing mechanism is connected with a screw rod of the push rod, and the moment output by the power-assisted motor pushes a rock arm shaft to rotate through a screw nut transmission pair. The electronic control unit is used for controlling the current of the power-assisted motor according to signals of the torque of the steering wheel and the vehicle speed and so on. The steering device can save energy, provide proper power assistance under various running work conditions, has fewer parts, light weight, compact structure and high assembly automatic degree, and is a steering mechanism of vehicle power with energy conservation, safety and environmental protection.

The invention discloses an automobile electric control composite steering system and a multi-objective optimization method thereof. The electric control composite steering system comprises an engine control unit (ECU), a mechanical drive module, an electrically controlled hydraulic power module and an electric power-assisted module. The mechanical drive module comprises a steering wheel, a steering column, a recirculating ball-type steering gear, a steering tie rod and the like; the electrically controlled hydraulic power module comprises a hydraulic tank, a hydraulic pump, a driving motor for the hydraulic pump and a rotary valve and the like; the electric power-assisted module comprises an arc-shaped linear electric motor and the like. According to the driver's preferences, road conditions, vehicle speed, steering angle and rotation speed and the like, the participation mode of the electric power-assisted of the composite steering system is determined. The motor of steering feeling, steering sensitivity and steering power consumption are taken as optimization targets and the steering range is selected as a constraint condition; the important parameters of the composite steering system are optimized through the new multi-objective optimization method and the comprehensive performance of the composite steering system is improved.

An arrangement for detecting a load bearing failure includes a primary load-carrying system for bearing axially translatably a coaxial load, said primary load-carrying system having a rotor portion and an axially displaceable stator portion. A plurality of bearing balls is interposed between the rotor and axially displaceable stator portions. A detector, which may include any of a laser measuring, an ultrasonic measuring, or a linear variable transformer or electrical contact detects wear or actual or impending failure of the primary load-carrying system. A secondary load-carrying system may be provided for bearing the coaxial load upon the event of a failure of the primary load-carrying system. The primary load-carrying system is a recirculating ball screw arrangement wherein the plurality of bearing balls is disposed in part in respective helical grooves of the rotor and axially displaceable stator portions. Wear or escape of the bearing balls is detected.

A worm shaft (46) has a first end section (52) and a second end section (54) extending from a worm section (50). A first drive system (98) is in driving engagement with the first end section (52) of the worm shaft (46), and a second drive system (104) is in driving engagement with the second end section (54) of the worm shaft (46) for redundantly steering a vehicle. The worm section (50) of the worm shaft (46) is disposed between the first drive system (98) disposed on the first end section (52) of the worm shaft (46) and the second drive system (104) disposed on the second end section (54) of the worm shaft (46). A lost motion connection (82) is disposed between an input shaft (76) and said worm shaft (46).

The invention discloses a recirculating ball-type electro-hydraulic steering system based on magnetorheological fluid and an optimization method of the recirculating ball-type electro-hydraulic steering system. The system includes a mechanical transmission module, an electric power module, a magnetorheological fluid power module and a power control module, a magnetorheological fluid material is placed in a magnetorheological fluid cavity in a recirculating ball steering gear, a magnet exciting coil is placed outside a shell of the recirculating ball steering gear, and the direction of a magnetic field generated by energization of the magnet exciting coil is perpendicular to the direction of an electric field formed by energization of a plate electrode. According to the recirculating ball-type electro-hydraulic steering system based on the magnetorheological fluid and the optimization method of the recirculating ball-type electro-hydraulic steering system, through establishment of an electro-hydraulic steering system optimization model, an ecological niche multi-objective particle swarm optimization algorithm is used for optimization, the structure of the system is simplified, and the controllability of the steering road feel is improved.

An embodiment is an electromechanical door latch system including a latch device configured for motion between a latched position and an unlatched position. A manually actuated mechanical apparatus is coupled to the latch device and configured to move the latch device to the unlatched position in response to force applied by a user to a component of the mechanical apparatus. An electromechanical actuator system moves the latch device to an actuator unlatched position in response to an electrical signal from an access control device. The electromechanical actuator system includes a control module, a motor, and a ball screw drive including a ball screw or threaded nut, with one coupled to the motor shaft and the other configured for connection to a latch mechanism, and at least one recirculating ball circuit including ball bearings for transferring torque from the motor to the ball screw drive.

An arrangement for detecting a load bearing failure includes a primary load-carrying system for bearing axially translatably a coaxial load, said primary load-carrying system having a rotor portion and an axially displaceable stator portion. A plurality of bearing balls is interposed between the rotor and axially displaceable stator portions. A detector, which may include any of a laser measuring, an ultrasonic measuring, or a linear variable transformer or electrical contact detects wear or actual or impending failure of the primary load-carrying system. A secondary load-carrying system may be provided for bearing the coaxial load upon the event of a failure of the primary load-carrying system. The primary load-carrying system is a recirculating ball screw arrangement wherein the plurality of bearing balls is disposed in part in respective helical grooves of the rotor and axially displaceable stator portions. Wear or escape of the bearing balls is detected.

An expandable steering system for an amphibious vehicle whose wheels move into retracted and deployed positions comprises a steering column connected to a steering wheel, a rack and pinion or recirculating ball mechanism connected to the column for moving the system, and a series of expandable shafts connected through gearboxes to the wheels. The shafts expand and contract as the wheels move through their retracted and deployed positions, and the angle at which the steering mechanism is connected to the wheels does not change as the wheels move.

The invention discloses a push rod type electric power steering device for a commercial vehicle. The device comprises a circular ball type steering gear provided with a steering wheel torque and corner sensor, a planetary rolling column screw type electric push rod power steering mechanism and an electronic control unit. The steering wheel torque and corner sensor is used for detecting torque anda steering wheel corner acting on a steering wheel and is arranged on the input end of the circular ball type steering gear, the planetary rolling column screw type electric push rod power steering mechanism comprises a motor, a synchronous belt speed reduction mechanism, a planetary rolling column screw transmission pair, a linear guide rail, a push rod and the like, a motor output shaft is connected with a small belt wheel, a motor outputs torque and transmits the torque to a planetary rolling column screw through a synchronous belt, a large belt wheel inner hole is connected with a screw inthe planetary rolling column screw, the output torque is transmitted and amplified through the planetary rolling column screw transmission pair, and a steering rocker arm shaft is pushed to rotate. One end of the planetary rolling column screw type electric push rod power steering mechanism is connected with a steering rocker arm, the other end of the planetary rolling column screw type electricpush rod power steering mechanism is connected with a vehicle frame, through planetary rolling column screw transmission, large thrust steering assistance is obtained, and pure electrification and intelligence of a heavy commercial vehicle steering system can be achieved.

A downhole separation apparatus for releasing a pipe string from a bottom hole assembly is disclosed. The apparatus has a tubular collet body, a tubular bottom sub, and a piston collet positioned within the collet body. The collet piston has a plurality of collet fingers threadedly engaging an internal profile of the bottom sub. Separation is accomplished by pumping a circulation ball through the pipe string until it lands on a ball seat inside the collet piston. Increasing fluid pressure then shifts the piston collet axially downward within the collet body thereby causing the collet fingers to collapse to disengage the bottom hole assembly from the pipe string.

A steering system with magnetic torque overlay of a vehicle is provided. The system comprises a hydraulic valve and differential-pressure transducer that monitors pressure created by the valve due to torque exerted by a driver of the vehicle in various directions on a steering wheel thereof. The transducer is fastened to a recirculating ball steering gear. A magnetic actuator generates an output of torque required from the steering gear for a maneuver of the steering wheel and applies the torque to the valve independently of input by the driver. A permanent magnet is located proximate the actuator. A control module calculates an appropriate amount of electric current and sends it to the actuator to generate the output torque. The torque is added to or subtracted from the system in any of the directions independently of the driver input by the pressure-monitoring and inputs from the vehicle into the control module.

The invention discloses an integral active electric power-assisted steering mechanical structure. The structure comprises an electric power-assisted steering system, a steering system gear ratio system and a back wheel steering system, wherein the electric power-assisted steering system and the steering system gear ratio system are realized by a steering system variable-gear ratio electric power-assisted steering system; the back wheel steering system is a special device system for supplying steering force to a back wheel; the steering system variable-gear ratio electric power-assisted steering system is realized by an electronically-controlled harmonic gear transmission between a steering wheel and a lower transmission shaft; and the back wheel steering system consists of a support shaft ring, an outer shell, a motor stator coil, a permanent magnet rotor, a motor angle sensor, a central hollow shaft, a recirculating ball retarding mechanism, a lock sleeve and a rack shaft. In a steering process, an adjusting motor and a power assisting motor are controlled flexibly and compensate for each other, so that steering sensitivity, portability and operation stability are combined perfectly and operation performance and safety performance are enhanced.

The invention relates to a design method for a rack tooth profile of a gear pair of a recirculating ball type variable-ratio steering gear. The design method is characterized by including the following steps: allowing a gear and a rack to be meshed for transmission according to a transmission ratio rule, selecting a reference point on the rack, and solving contact point height of the reference point at every motion instant to obtain a corresponding height set; according to positional relation of a sector and the rack, solving an extreme value of the height set, wherein the obtained extreme value is the height of a tooth profile point corresponding to the reference point; changing the position of the reference point to further obtain the tooth profile points of the whole section and the entire rack tooth profile surface. The generating simulation principle is not adopted, various problems of the traditional method are avoided, principle error is avoided, and digital solving can be realized.

An actuating device (18) or a clutch (16) of a motor vehicle (2) comprising one electric motor (34), one gearing (36, 40, 42, 44) which converts rotational motion of the electric motor (34) into a translatory motion and one accumulator (52). The converter gearing comprises one recirculating ball spindle (44). The accumulator (52) is at least partly situated within the recirculating ball spindle (44), and at least parts (58, 60) of a displacement sensor (56) are situated within the recirculating ball spindle (44).

A linear electro-mechanical actuator, includes a containment structure (2), one or two pushers facing each other (7), a nut (5) rotatable about an axis (X) driven by a driving force, a screw shaft (6) inserted in the nut (5), connected to the pushers and interconnected with the nut (5) via a helical recirculating ball coupling (5a, 6a), and an anti-rotation mechanism (8) acting on the screw shaft (6) to prevent the screw shaft (6) from rotating about the axis (X). The anti-rotation mechanism (8) includes a pair of fixed guide bars (9), coupled in a sliding fashion with the screw shaft (6) and extending along a direction parallel to the axis (X) and spaced from the axis (X).

A recirculating ball screw and nut drive including a spindle, a spindle nut guided on the spindle, balls guided between the spindle and the spindle nut, in a working passage defined by grooves of the spindle and spindle nut, and deflection pieces arranged on both ends of the spindle nut to divert the balls out of the working passage into a return passage accommodated in the spindle nut, and to divert the balls out of the return passage into the working passage accommodated in the spindle nut, where the ball deflection pieces are annular and composed of at least two circular-ring sectors.

In a recirculating ball nut for a ball screw drive, having a base body which includes at least one recirculating ball track, the base body is a forged component and the recirculating ball track is manufactured by a cutting manufacturing method. A further subject matter of the invention is an assembly for a ball screw drive of a power steering, having a belt pulley and a recirculating ball nut according to the invention, the belt pulley being connected to the recirculating ball nut so as to be non-rotatable relative thereto. A further subject matter of the invention is a method of manufacturing a recirculating ball nut.

The invention discloses a method for designing a gear sector tooth profile of a recirculating ball variable-ratio steering-gear gear pair. According to a gear-sector and rack transmission ratio law, a gear-sector and rack meshed point is obtained by calculating the instant pitch radius and the rack displacement, coordinate conversion is carried out on the meshed point to obtain a tooth profile point, finally a tooth shape is perfected, and a whole gear sector tooth profile point is obtained. The method mainly includes the following steps: S1, calculating basic design parameters; S2, determining a cross section; S3, selecting a gear sector rotational angle; S4, calculating the instant pitch radius and the rack displacement; S5, solving the meshed point; S6, solving the tooth profile point; S7, perfecting the tooth shape; S8, solving the gear sector of the selected cross section; S9, solving the whole gear sector tooth profile. The method has the advantages that principle errors are avoided, and the solving accuracy is high; the method is a parametric design method and is suitable for solving gear sector tooth profiles of all straight-tooth type gear pairs.

The invention relates to a clamping device for an injection molding machine for plastics, including a fixed platen (11) which is connected to a moving platen (12) by means of a toggle mechanism (13). A hollow-shaft motor (7) is provided to cooperate with a spindle (21) for operating the toggle mechanism, wherein the hollow-shaft motor (7) is connected to the toggle mechanism (13). According to the invention, the spindle (21) is arranged in a rotationally fixed manner, the end of the spindle (21), facing the moving platen (12), is in engagement with the rotor (6) of the hollow-shaft motor (7), and the stator (4) of the hollow-shaft motor is connected with the toggle mechanism (13). Preferably, a spindle nut is fixed in the rotor (6) for engagement with the spindle (21), preferably in the form of a recirculating ball screw.

The invention discloses a multifunctional electric recirculating ball steering system of a commercial vehicle and a control method thereof. The multifunctional electric recirculating ball steering system comprises an electric power module, a mechanical transmission module and a control module; the electric power module comprises a double-rotor motor module and a power assisting motor. The mechanical transmission module comprises a steering wheel, a steering shaft, a coupler, a recirculating ball steering gear, a gear sector, a gear sector shaft, a steering straight pull rod, a steering transverse pull rod, a steering knuckle arm, a left trapezoidal arm, a right trapezoidal arm, a left steering knuckle, a right steering knuckle, a left wheel and a right wheel. The control module comprises an electronic control unit, a torque sensor, a vehicle speed sensor, an angle sensor and a current sensor. According to the invention, the high reduction ratio capability of the recirculating ball steering gear is fully exerted, the power assisted torque of the system is maximized, the electric power assisted function is realized, the system is simplified, and the reliability of the system is ensured while the drive-by-wire function is provided.

The invention discloses an electro-hydraulic power steering system for battery electric buses. The electro-hydraulic power steering system which is effectively energy-saving comprises a steering wheel, a steering oil cylinder, a flow control valve and overflow valve assembly, a steering hydraulic pump, a steering drive three-phase asynchronous motor, a converter, a hybrid power supply, a steering drive motor speed sensor, a bus drive motor speed sensor, a front axle load sensor, a speed sensor and a recirculating ball integrated power steering gear. The recirculating ball integrated power steering gear is composed of a steering screw, a steering control valve, a steering power cylinder, a steering nut and a steering gear sector. The electro-hydraulic power steering system has the advantages that control methods of multiple driving conditions such as front axle load are changed, steering drive motor speed is controlled, steering energy saving is improved, and portability and good touch are balanced with stability and fast response.

The invention discloses a mechanical recirculating ball type electric power steering device, which is mainly composed of a direct-current brushless motor, a controller, a sensor, a worm and gear pair,a steering screw nut pair, a rack sector pair and a shell. The steering screw nut pair of a key transmission mechanism adopts an end face circulation mode and is composed of a steering screw, a steering nut, reversers, check rings and a steel ball, and an inner roller path of the steering nut and an outer roller path of the steering screw are combined to form a working roller path of the steel ball. The reversers are embedded in two ends of the steering nut respectively and are axially limited through the check rings. According to the structure, the bearing capacity of the steering screw nutpair is obviously improved, load distribution is even, the structure is stable and firm, the weak link of reversing impact does not exist, the space structure is compact, operation is flexible and smooth, the machining manufacturability is good, and a better use prospect is achieved.

A linear electro-mechanical actuator includes a containment structure (2), a nut (5) positioned in the containment structure (2), a screw shaft (6) inserted in the nut (5) and interconnected with the nut (5) via a helical recirculating ball coupling, and an anti-rotation mechanism (9) positioned inside the screw shaft (6) to prevent the screw shaft (6) from rotating about the axis (X). The anti-rotation mechanism (9) includes a guide unit (10) fixed cantilever-style to the containment structure (2) and connected to the screw shaft by a non-rotational coupling.

The invention relates to a part of an automobile, in particular to an electric power steering gear (P-EPS) structure for an automobile. In order to solve the technical problems of fuel oil consumption of the traditional hydraulic power steering system of the automobile, save energy sources and reduce emission, the invention adopts the technical scheme comprising a steering torque sensor directly driven by a steering wheel, a steering motor, and a shell and left and right tie rod of a rack shaft, wherein a pinion at the lower part of the steering torque sensor drives a rack; the steering torque sensor detects moment and position signals on a steering shaft, and the moment and position signals are continually input to a microcomputer control unit together with vehicle speed signals measured by a vehicle speed sensor; the steering motor is arranged on the inner wall of the middle part of a middle column tube of the steering gear; the inner wall of the middle column tube of the steering gear is provided with a speed reducer; and the speed reducer adopts recirculating ball type speed reducing gear assorted with the inner shell of a motor rotor. The electric power steering gear of the automobile provides required auxiliary power to achieve stable manipulation, light steering and safe running.

A power steering system with a circulating ball spindle mechanism, an extending element of the circulating ball spindle mechanism being support rotatably over a bearing and the bearing of the element making possible a swiveling motion corresponding to the direction of action of interfering forces.