71results about How to "Increase critical speed" patented technology

The invention discloses a bogie for a high-speed rail wagon. The bogie comprises a framework, wherein two transverse ends of the framework are connected with a wheel set through two single-stage suspension systems respectively; a double-stage suspension system and a foundation brake device are arranged on the framework; and the front side and the rear side of the framework are provided with an anti-snakelike damper respectively. By the bogie, two-grade requirements that the shaft weight is 16.5t when the speed of the wagon is 200km/h as well as the shaft weight is 18t when the speed of the wagon is 160km/h can be met simultaneously; and the bogie has the remarkable characteristics of simple structure, high popularity and reliable performance.

The tracker is formed by a structure (3) bearing a platform (1) carrying the solar panels (2) that varies both the azimuth and elevation orientation thereof in order to track the sun. This movement is achieved by means of two actuators (4) connected respectively to fixed points (P1^o, P2^o) on the ground and other vertices (P1, P2) of the platform (1), thereby causing the platform to rotate around a central support point “O” of the same. The distances (D1, D2) between the points which join the actuators (4) have a one-to-one relation with the rotation angles (β, α) of the platform (1) around both perpendicular axes: an oblique fixed axis (O-Cl) and another axis (0-Az) that angularly varies the inclination thereof with respect to the first.

Magnet wires wound in slots in a lamination stack of a dynamoelectric machine are encapsulated, in whole or in part, with plastic. The plastic may be thermally conductive and have features molded therein that enhance heat transfer. The plastic may stiffen the armature and increase its critical speed. Characteristics of the plastic, its geometry and its distribution may be varied to adjust spinning inertia and resonant frequency of the armature. The magnet wires may be compressed into the slots, by application of iso-static pressure or by the pressure of the plastic being molded around them. Larger magnet wire can then be used which increases the power of the electric motor using the armature having the larger magnet wire. A two or three plate mold may be used to mold the plastic around the armature. Balancing features can be molded in place. The plastic can have a base polymer that is a blend of two or more polymers and various thermally conductive fillings.

The invention relates to a flexible direct-drive type steering rack, which uses a flexible beam to enable a structure to be flexible. Left and right lateral racks easily do relative nodding movement, so as to be applicable to a triangular pit with a larger rail. The structure is flexible so that a series of suspension can be simplified to a very thin layer of rubber cushion, and the production cost is reduced; an elasticity transmission device is elastically suspended through a permanent magnet motor, so that the torque can be transmitted, the transmission efficiency can be improved, and the weight of a transmission mechanism can be reduced; a traction force and a braking force can be directly transmitted to a car body instead of the structure of the steering rack, and the stress condition of the structure of the steering rack is optimized; meanwhile, the length of a traction rod is not limited by the structure, so that the traction rod can be longer, the secondary addition rigidity brought by the traction rod can be reduced, and the riding comfort degree of a vehicle can be improved. A motor is suspended between wheel pairs, so that a shaft distance can be reduced. Therefore, the steering rack not only can have higher critical speed through a smaller curve, but also has good submissiveness on route irregularity.

A first centrifugal impeller and a second centrifugal impeller are arranged in such an orientation that back sides of the first centrifugal impeller and the second centrifugal impeller face to each other. Bearings are cylindrical roller bearings and a thrust bearing. The cylindrical roller bearings are arranged at two axially spaced supporting positions respectively, and support a radial load applied to the rotating shaft. The thrust bearing supports a thrust load applied to the rotating shaft.

A combined internal combustion engine and waste heat recovery system is provided. The combined internal combustion engine and waste heat recovery system comprises the internal combustion engine, the waste heat recovery system, and a ratio adapting device. The internal combustion engine includes a turbocharger. The waste heat recovery system comprises a condenser, a pump, a heat exchanger, and an expander. The expander is in driving engagement with the turbocharger. The ratio adapting device is drivingly engaged with an output of the internal combustion engine and the expander of the waste heat recovery system. The ratio adapting device may be engaged to transfer energy from at least one of the turbocharger and the expander to the output of the internal combustion engine.

The invention discloses a hydraulic damper. The hydraulic damper comprises an oil cylinder barrel, a piston and a piston rod. A working cavity is arranged in the oil cylinder barrel. The piston is arranged in the working cavity. The working cavity is divided into a first working cavity and a second working cavity. One end of the piston rod is arranged on the piston. The other end of the piston rod penetrates through the first working cavity to be arranged outside the oil cylinder barrel. A compensation cavity is further arranged in the oil cylinder barrel. The compensation cavity is located at the end, far away from the first working cavity, of the second working cavity. A flow direction control assembly is arranged between the compensation cavity and the second working cavity. The hydraulic damper has the advantages of being simple in structure, small in size, high in reliability, long in service life, high in universality and the like.

The invention discloses a steering frame of a railway track car with flaw detection devices, which comprises a framework, the upper part of the framework is provided with a traction seat connected with a car body through a traction device; the lower part of the framework is provided with an elastic node seat which is connected with a shaft box body through an elastic node; the shaft box body is connected with wheel pairs; a support spring arranged on the framework, a horizontal shock absorber and a two-system vertical shock absorber form a two-system suspension system of the car body; a shaft box spring with one end supported at the upper part of the shaft box body and the other end supported at the lower end of the framework and a one-system vertical shock absorber arranged on the framework form a one-system suspension system of the car body; the end part of the framework is provided with a unit brake; the shaft box body is provided with flaw detection devices arrange at intervals along the direction of steel tracks; and detection wheels of the flaw detection devices are in direct contact with steel tracks between the wheel pairs. According to the invention, the manufacturing cost is lowered, the shock of the detection wheels is reduced, the flaw detection accuracy rate is improved; moreover, the steering frame has the advantages of good operation quality is good, high pass curve performance, small horizontal force of wheel tracks, reliable braking performance and great convenience in maintenance and can completely meet the requirement of steel track flaw detection with high flaw detection speed.

The invention discloses a semi-active train control method based on a magnetorheological fluid damper. The method comprises the following steps of S1, obtaining a yaw angular velocity of a front wheel pair, a yaw angular velocity of a rear wheel pair and a yaw angular velocity of a bogie in the operation process of a train through a gyroscope; S2, processing and computing the yaw angular velocity of the front wheel pair, the yaw angular velocity of the rear wheel pair and the yaw angular velocity of the bogie in the operation process of the train so as to obtain relative yaw angular velocities of the front wheel pair and the rear wheel pair relative to the bogie; S3, obtaining relevant line information of the train operation through a vehicle data bus MVB; and S4, judging the type of a train operation line according to the relevant line information and controlling a plurality of longitudinal magnetorheological fluid dampers arranged on the train according to a train control strategy corresponding to the type of the train operation line so as to realize the control of the train. Through the adoption of the technical scheme disclosed by the invention, the stability of the train in linear operation can be effectively enhanced, the critical velocity is increased and the curve passage capacity of the train is improved.

There is provided a method for increasing the critical speed of a rotating disk and disk using same. The method comprises the steps of providing a disk and fastening at least one heat sensitive insert to the disk. The insert exerts a tensile stress on the disk when an insert temperature exceeds a predetermined temperature. The disk could be a saw blade. Also, there is provided a saw blade and method having a reduced kerf at high speeds, the blade having a serrated cutting edge. The blade comprises at least one insert attached to the blade, the at least one insert exerting a tensile stress on the blade when an insert temperature reaches a predetermined temperature, the exerted tensile stresses opposite to those induced by the blade temperature.

The present disclosure provides a thrust bearing that includes: a damper body including a body part and protrusions axially protruding at predetermined areas on the body part with flat tops; and thrust top foils each having a contact portion that is in surface contact with the tops of the protrusions. The present disclosure provides a combo bearing that includes: a damper body including a body part having a through-hole at the center through which a rotary shaft passes, and protrusions axially protruding at predetermined areas on the body part with flat tops; thrust top foils each having a contact portion that is in surface contact with the tops of the protrusions; and a radial top foil covering the rotary shaft and disposed along the inner side of the through-hole of the damper body.

A wheel truck, including: a front wheel pair assembly and a rear wheel pair assembly, two side frame assemblies, two spring suspension devices, and a bolster assembly. The spring suspension devices include a bearing spring unit, a damping spring, and a wedge. The wedge includes a primary friction surface and a secondary friction surface. The primary friction surface is attached to a column surface of the side frame assembly. The secondary friction surface is attached to an inclined surface of the bolster assembly. The wedge has the following structure parameters: α=16-30°, and μ<tgα<μ+μ₁, in which a represents an included angle between the secondary friction surface and a vertical plane, μ represents a friction coefficient of the primary friction surface, and μ₁ represents a friction coefficient of the secondary friction surface.

A damping device, including: a wedge assembly having a wedge including a vertical surface and an inclined surface; a primary friction board disposed on the vertical surface; and a secondary friction board disposed on the inclined surface; and a damping spring assembly disposed underneath the wedge assembly. The wedge assembly has the following structure parameters: α=16-30°, and μ<tgα<μ+μ₁, where α represents an included angle between a friction surface of the secondary friction board and a vertical plane, μ represents a friction coefficient of the primary friction board, and μ₁ represents a friction coefficient of the secondary friction board.

The invention discloses a scientific research ship with a podded electricity propulsion system. A podded thruster which is connected with a power output control system and internally provided with a synchronous motor is arranged below the stern of a hull, a propeller which is coaxially connected with a rotary shaft of the synchronous motor is arranged on the outer side of the housing of a pod, anda telescopic mechanism which is used for driving blades to extend outwards in the diameter direction of the hub and a power mechanism which is used for driving the actuation of the telescopic mechanism are arranged on the hub. The rotation rate of the propeller is monitored in real time to drive the telescopic mechanism to control the stretching amount of the blades according to the need of the actual speed of the hull. The scientific research ship has the advantages that the propulsion force of the propeller is changed by changing the diameter of the propeller, electricity cost is reduced, the overall service life of the electricity propulsion system is prolonged, vacuoles are prevented, the magnitude of the propulsion force of the propeller is changed by changing the effective diameterof the propeller and the area of a propeller disc, the constant changing of propulsion force of the propeller is achieved, and more energy is saved.

Disclosed is a monomotor-driven double-shaft steering bogie for power cars and urban rail vehicles, comprising a truss, a brake shoe, a brake disc, an oscillating damper, wheels, wheel-countershafts, a drive motor, a shaft join, gear cases and a secondary spring. The invention is characterized in that the steering bogie has two shafts and is driven only by one motor, that means one motor drives the two shafts of the steering bogie synchronously. The drive motor is arranged at the middle part of the steering bogie and two gear cases are disposed at the two sides of the drive motor; two ends of the shaft of the drive motor are respectively connected with the two wheel-countershafts through the gears in the two gear cases; the drive motor is mounted on the beam of the truss and the shaft of the motor is parallel to the wheel-countershafts. The shaft of the motor is connected with the shafts of the drive gears in the gear cases; gear clusters are arranged inside the gear cases to shift gears. One gear cluster consists of a drive gear, an idle gear and a gearwheel; the gearwheels are fixed with the wheel-countershafts through interference fit and the wheel-countershafts are fixed with the wheels through interference fit. When the drive motor is galvanized, the shaft of the motor drives the drive gears to rotate and the drive gears drive the gearwheels to rotate through the idle gears; the interference fits between the gearwheels and the wheel-countershafts, and the interference fits between the wheel-countershafts and the wheels make the wheels to rotate, then the vehicle starts to move.

The invention discloses a steel three-part control pattern structure steering rack with self-guide device, which loads self-guide device on the traditional three-part steel steering rack with elastic device between self-guide device and lateral rack.

The invention discloses a combined tapered wedge used for a steering frame of a railway vehicle, which comprises a main body of a tapered wedge and a main friction board; the main body of the tapered wedge is a hollow prismoid; the body of the tapered wedge is provided with a vertical main friction surface and also provided with an inclined secondary friction surface; the main friction board is arranged on the main friction surface of the tapered wedge; the left side and the right side of the secondary friction surface are provided with a first assistant friction surface; the first assistant friction surface is coplanar with the secondary friction surface and extends to the two sides of the secondary friction surface. The two sides of the secondary friction surface are respectively and fixedly connected with the assistant friction surface which is coplanar with the secondary friction surface, therefore, the shearing moment of the steering frame for resisting diamond deformation is remarkably enlarged, thereby improving the anti-diamond rigidity of the steering frame. The combined tapered wedge can improve the critical velocity of the snakelike instability of the railway vehicle; the rail vehicle can obtain better running stability and digression safety.

The invention aims to provide a wagon bogie. The wagon bogie comprises wheel pair devices arranged at front and rear sides, side beams positioned at two left and right sides, a swing bolster positioned between the two side beams and damping devices mounted on the side beams; two crossing support devices are arranged between the two side beams and are positioned at two sides of the swing bolster respectively; the crossing support devices comprise two crossing rods; four end parts of the two rods are provided with an elastic joint respectively; the elastic joints are connected with the side beams; and the elastic joints are in threaded connection with the rods. The wagon bogie can improve the rhombus-resistant rigidity, enables a train system to be higher in the critical speed and stronger in stability, and can improve the adaptive capacity of the bogie for anti-torsion and unsmooth conditions.

The invention belongs to the field of ship or rudder design and particularly relates to an anti-cavitation twisted rudder and a design method thereof. On the basis that the influence of various factors such as the rotational speed in the ship propeller wake flow on the rudder is fully considered, the geometrical attack angles and line types of all the spanwise position sections are designed and determined through the distribution characteristic of a propeller rear wake flow field in direct sailing of a ship, so that the geometrical shape of the rudder is matched with that of the propeller wake flow field, and the purposes that the pressure distribution of the rudder surface is improved, the cavitation starting sailing speed of the rudder is increased, the time of rudder cavitation is shortened, the area of rudder cavitation is decreased, vibration and noise caused by the rudder are reduced, cavitation denudation of the rudder surface is restrained, the maintenance cost of the rudder is saved, the force state of rudder blades is improved, the rudder efficiency is improved, and the load of the rudder is reduced are achieved.