83results about How to "Small braking torque" patented technology

The invention discloses a forklift travelling and parking integrated wet-type brake driving axle which comprises a main reducer assembly, an axle housing assembly, a left brake assembly, a right brake assembly, a left half axle, a right half axle, spline sleeves and fixing gear rings. A group of friction plates are arranged on each spline sleeve; a group of diaphragms are arranged in a groove of an inner hole of the left axle housing and a group of diaphragms are arranged in a groove of an inner hole of the right axle housing in the axle housing assembly; the friction plates and the diaphragms are alternately mounted; the left brake assembly and the right brake assembly are each provided with a parking brake mechanism and a travelling brake mechanism; hydraulic oil is guided into the left axle housing, and thus travelling brake and parking brake is completed in the parking brake mechanism and the travelling brake mechanism correspondingly under the action of the hydraulic oil. The friction plates are separated from the diaphragms through centrifugal force and inertia force after a vehicle moves. The influence on the parking brake from external factors like mud, water and oil is avoided, and the maintenance is convenient since the friction plates and the diaphragms can be maintained and replaced without disassembling an axle assembly.

The invention discloses an independent type automobile hydraulic retarder based on a magnetorheological fluid and a control method thereof. A working cavity is sealed, the magnetorheological fluid is filled in the working cavity, a driving wheel, a fixed wheel, a coil and a cooling water jacket are accommodated in the working cavity, the moving wheel and the fixed wheel are coaxially opposed with clearance, the coil is winded around the outer edges of the moving wheel and the fixed wheel, the coil is fixed at the outer edge of the moving wheel, a clearance exists between the coil and the outer edge of the fixed wheel, the coil is connected with a vehicle power supply outside the working cavity, an output end of a moving wheel shaft extends out of the working cavity and is connected with a speed changer through a driving gear pair, the cooling water jacket is fixedly sleeved on the fixed wheel outer ring, the cooling water jacket is connected with a water pump and a radiator outside the working cavity, according to vehicle information of a vehicle controller, an electronic control unit calculates the current which is input into the coil, establishes magnetic field in the working cavity and generates a braking torque which acts on the moving wheel shaft, the electronic control unit controls the water pump to work so that the cooling water can circularly flows among a cooling water pipeline, the cooling water jacket and the radiator, and the temperature of the magnetorheological fluid can be decreased.

The invention provides a device and method for recovering the inertial energy of automobile wheels, belonging to the fields of automobile energy saving and emission reduction and new energy electric vehicles. The invention adds a fixed internal gear insert on the inner ring of the automobile wheel hub. When the automobile wheel rotates, the power increases through the internal gear transmission mechanism and directly drives the permanent magnet synchronous generator to generate electricity, which is generated by the brake pedal sensor and the tire speed sensor. The signal controls the opening and closing of the electromagnetic clutch, which directly drives the permanent magnet synchronous generator to generate electricity. At the moment of braking and deceleration of the car, it can quickly release and recover the inertial energy of the car wheels in large quantities, and provide power to the battery or the power network of the whole vehicle. The device has the advantages of simple structure, small volume, high energy recovery rate, good reliability, low manufacturing cost, and certain technical and economic feasibility.

The auxiliary braking device with magnetic rheological body for petroleum rig includes one cylinder of non-magnetic conductive material and two end caps of magnetic conductive material to form one sealed cylindrical cavity, two magnetic conductive columns with wound exciting coil outside the cylinder and between the two end caps, one shaft of non-magnetic conductive material with fixed magnetic conductive blades set between the two end caps, and magnetic rheological body filled in the sealed cylindrical cavity. The present invention can provide great braking moment at all rig winch speeds, and has stepless regulation of braking moment, fast response, low cost and long service life.

The invention discloses a hoisting mechanism. When the hoisting mechanism is in a rising mode or a falling mode, a speed reducer motor functions in driving, a clutch is closed, and the output shaft of the speed reducer motor is connected with a winding drum by use of a planetary gear mechanism and drives the winding drum t rotate; when the hoisting mechanism is in a free hook dropping mode, the speed reducer motor stops, the clutch is opened, the winding drum drives the planetary gear mechanism to speed up so as to drive a brake hub to rotate, and then the stop of the rotation of the winding drum is realized at last by use of a brake. According to the hoisting mechanism, when the hoisting mechanism is located at the braking phase of the free hook dropping mode, due to speeding up of the planetary gear mechanism, the rotating speed of the brake hub is greatly increased and the braking torque of the brake is quickly reduced, and therefore, the volume of the brake hub is remarkably reduced and the braking capacity of the brake is enhanced. According to the technology, the mounting space is reduced, and the hoisting mechanism is enabled to hoist more heavy materials and drop the hook freely in the free hook dropping mode. The invention also provides an engineering machine.

The invention relates to a traction drive (1) for the driving and generative braking of a rail vehicle or a combination of rail vehicles, a permanent-field synchronous motor (6a, 6b) and a traction current converter (4a, 4b) being respectively associated with at least two axles of the rail vehicle or combination of rail vehicles. The traction current converter (4a, 4b) comprises at least one pulse current converter (22) on the engine side, and the clamps of the permanent-field synchronous motor (6a, 6b) are connected to a change-over switch (30a, 30b) such that the permanent-field synchronous motor (6a, 6b) can be connected to a load circuit (32a, 32b) containing at least one load element (28a, 28b), in order to drive the pulse current converter (22) or for generative braking. According to the invention, the load circuits (32a, 32b) connected to the permanent-field synchronous motors (6a, 6b) for generative braking are designed such that the brake characteristic lines of the permanent-field synchronous motors (6a, 6b) differ in terms of characteristic features such as the position of the maximum of the brake torque according to the rotational speed.

The invention discloses an integrated safe driving device. The integrated safe driving device comprises a driving motor, a speed reduction box, a main driving shaft and a bearing seat which are pre-integrated and in sequential transmission fit, wherein the bearing seat is arranged at the end, far away from the speed reduction box, of the main driving shaft, installation positions for being fixed to a truss are arranged at the bottoms of the speed reduction box and the bearing box, and an output gear of the speed reduction box and the main driving shaft are positioned through tightly matched conical surfaces. The invention further provides an installation method of the integrated safe driving device. The driving motor, the speed reduction box, the main driving shaft and the bearing seat are pre-integrated, installation of the driving device is facilitated, installation difficulty is reduced, installation accuracy is improved through matching of the conical surfaces, installation efficiency is guaranteed, and products meet national standards and have large market prospects.

The invention relates to an elevator traction system which solves the problem that in the prior art, the diameter of a traction wheel is difficultly further reduced. The elevator traction system comprises a traction machine and guide wheels. A traction wheel is connected to a traction machine shaft. A traction rope winds the traction wheel and the guide wheels, the two ends of the traction rope are connected with an elevator car and a counter weight respectively, the two guide wheels are respectively the elevator car guide wheel and the counter weight guide wheel, the elevator car guide wheel and the counter weight guide wheel are symmetrically arranged below the two sides of the traction wheel, and the traction rope is of a band-shaped structure and composed of multiple rows of steel cores and nonmetal covering materials covering the steel cores. The elevator traction system has the advantages that the size of the traction wheel is reduced, torque is smaller, and therefore the size of the traction machine and the size of a brake device are smaller, the size is reduced, cost is lowered, energy is saved, and service life is prolonged.

Industrial truck with an electric travel drive and controls that can switch the electric travel drive to regenerative operation to brake the industrial truck, wherein an eddy current brake is provided that can be controlled or regulated by the controls during regenerative operation to brake the industrial truck, wherein the controls control or regulate the eddy current brake depending on the rpm of the electric travel drive, and wherein the controls control or regulate the eddy current brake in a manner such that the braking torque of the travel drive is supplemented at high rpms by the braking torque generated by the eddy current brake.

The invention relates to a compensation device (9) having a variable compensation volume (13, 22) for use in a brake system (1) in order to carry out a recuperation operation, comprising: an electrohydraulic actuator (10) for providing a variable compensation volume (13, 22); and a guard valve (15) which is configured to separate the compensation volume (13, 22) from an inlet-side inlet volume (31) with respect to an external pressure change if an absolute pressure in the inlet volume (31) exceeds a predefined pressure threshold value. Furthermore, the invention relates to a motor-vehicle brake system having a compensation device of this type.

An embedded electromagnetic liquid cooling retarder with a speed increaser belongs to the automobile auxiliary braking field. The retarder comprises an eddy current retarder portion and a planetary gear mechanism portion. The eddy current retarder portion comprises a retarder stator, a retarder rotor and an excitation coil. An axial section of the retarder stator is a C-shaped structure. A water channel is arranged in the stator and an external layer surface is provided with a water inlet and a water outlet. The excitation coil is wound into a shape and then is directly and fixedly arranged inthe stator. The rotor is divided into a magnetic conductive tooth portion and a connection portion. A magnetic conductive tooth is embedded between internal and external layers of the stator. A rotorflange is connected to a sun gear of a planetary gear mechanism. The retarder increases a rotation speed of the retarder rotor through the planetary gear mechanism and a speed n of an input shaft isincreased by k times (the k is between 2 and 3). Under the condition that braking power P is not changed, a braking torque T of the retarder can be reduced to T/k so that a massic volume of a retarderbody can be greatly reduced. The structure is simple, a rotational inertia of the rotor is small, a water cooling effect is good and braking safety of an automobile is improved.

The invention provides a coupler capable of achieving stable start. A motor is connected with a left half shaft of a bevel gear planet differential mechanism. A right half shaft is an output shaft. A planet carrier is connected with a friction plate in a hydro-viscous brake. The output torque is controlled by controlling the braking torque of the hydro-viscous brake.

The invention relates to a support device for a component which can rotate or carry out translational movements of a watch with a movement and at a fixed component of the watch. The movable component has one or more edges 14 extending along its path of movements with constant cross sections, which mutually spaced bearing rollers 20 with radially encircling grooves 21 on their radially circumferential peripheries are meshed into. Axes 19 extending perpendicular to the movement path of the movable component are provided. The bearing rollers 20 are freely rotatably around the axes. Eccentric bearing projections 16 axially adjoining the axis 19 are also provided, and are rotatably mounted adjustably in corresponding bearing recesses 15 of the fixed component of the watch under frictional resistance.

The invention discloses an auxiliary braking system which comprises a first braking disk, a second braking disk, a first gear transmission mechanism connected with the first braking disk, a second gear transmission mechanism connected with the second braking disk, and a braking force generation device which is connected with a power output shaft of the first gear transmission mechanism and is used for supplying braking force to a power output shaft of the second gear transmission mechanism. The auxiliary braking system disclosed by the invention reduces friction of the braking disks and energy loss, and can provide a reliable braking force and improve the braking reliability.

An adjusting system for camshafts of an internal combustion engine with an emergency running function, comprising a superposition gearing (1, 2, 3, 4) having a drive input element (2) which is driven by a crankshaft of the internal combustion engine, having a drive output element (1) which drives a camshaft (21) of the internal combustion engine and having an actuating element (4) by means of which a relative rotation between the drive input element (2) and the drive output element (1) can be realized by means of a device (7, 8, 9, 10, 11) for imparting a braking torque, which is variable fornormal operation, to the actuating element (4), wherein in the event of failure of the device (7, 8, 9, 10, 11) and/or of the control thereof, an emergency running position of the camshaft (21) can be attained and held by braking or arresting the actuating element (4). According to the invention, said adjusting system is characterized in that a lining carrier (8) of the device (7, 8, 9, 10, 11) is arranged in an axially movable and rotationally fixed manner on a shaft (5) which bears the actuating element (4), in that the braking torque for normal operation can be varied by means of an electromagnet (11) which acts on the lining carrier (8) counter to the force of a spring (10) and in contactless fashion, which is stationary and which can be acted on with variable voltage, and in that, inthe event of failure of the voltage applied to the electromagnet (11) and/or of the control thereof, the lining carrier (8) can be pressed against a stationary counterpart friction surface (7, 24) bythe force of the spring (10), and the emergency running position can thereby be set.

The invention discloses a closed two-cavity and two-row blade hydraulic retarder. The closed two-cavity and two-row blade hydraulic retarder comprises a left stator, a rotor and a right stator, and consists of four working cavities, wherein the four working cavities comprise two circular working cavities with larger radius and two square working cavities with smaller radius; each of the circular working cavities consists of left and right semicircular working cavities; each of the square working cavities consists of left and right semi-square working cavities; semicircular blades are arranged in the semicircular working cavities; and square blades are arranged in the square working cavities. The closed two-cavity and two-row blade hydraulic retarder overcomes the defects of large diameter of circulating circles, low brake torque, slow dynamic response and axial force in a traditional hydraulic retarder; and the brake torque needed for constant-speed stepping down of long slopes and brake of a heavy-duty truck and a motor bus can be provided by the smaller diameter of the circulating circles. The hydraulic retarder, provided by the invention, has the advantages of small diameter of the circulating circles, high brake torque, quick dynamic response, balanced axial force and improved bearing working conditions.

The invention discloses a pole-changing speed-adjusting permanent magnet motor, comprising a rotating shaft, a stator iron core and a rotor iron core which surround the rotating shaft and used for cooperating with each other; the stator iron core is provided with a stator slot; pole-changing winding is installed in the stator slot; in addition, a permanent magnet is arranged inside the rotor ironcore. The variable pole winding is used to provide at least two different pole numbers, in particular at least two independent sets of variable pole winding with different pole logarithms, or a set ofvariable pole winding is transformed by its wiring mode to correspond to at least two different pole numbers. The invention improves the component structure of the whole motor and the cooperation working mode between each component, especially by improving the setting of stator pole-changing winding and the corresponding pole-changing mode, the novel variable pole speed permanent magnet motor isobtained. Compared with the variable pole induction motor, the novel variable pole speed permanent magnet motor improves the efficiency and power factor, and solves a series of problems such as complex structure, high cost and high difficulty in pole-changing process control of the existing pole-changing speed-adjusting permanent magnet motor.