32results about How to "Hydraulic pressure reduction" patented technology

A slide valve, in particular for controlling a motor vehicle automatic transmission, has a housing which includes an axial end section. A connector sleeve is situated on the axial end section of the housing, the connector sleeve having a larger diameter in a first axial area adjacent to the housing and a smaller diameter in a second axial area remote from the housing, a filter device being situated in the first axial area. The second axial area includes a hydraulic connection.

The invention discloses a hydraulic control one-way valve, which comprises a valve body and a guide valve, a valve seat and a valve sleeve hermetically arranged in the valve body, wherein the valve seat is arranged between the guide valve and the valve sleeve; the inside of the guide valve is provided with a valve core; the end of the valve core is pressed against the valve seat; a piston is hermetically arranged in the valve sleeve; the end of the piston penetrates into the valve seat and is opposite to the front end of the valve core; a first spring is connected between the piston and the end face of the valve seat in a pressing way; the valve body is respectively provided with at least one first interface, one second interface and one third interface; the first interface is communicated with the guide valve; the second interface is communicated with the valve seat; and the third interface is communicated with the valve sleeve; the characteristic is that a pre-compression device is arranged in the valve core; and the advantages are that: since the pre-compression device is arranged in the valve core, the hydraulic control one-way valve reduces the impact force of hydraulic pressure on a subsequent connecting piece in the starting process, stabilizes the startup and reset of the subsequent connecting piece and reduces the hydraulic pressure required for starting.

The invention provides a method and a device for energy-saving control of an elastic load based on electrohydraulic servo drive. The device comprises a servo valve, a high-pressure oil source, a low-pressure oil source, an overflow valve and an actuating mechanism, wherein the actuating mechanism is a hydraulic cylinder or a hydraulic motor; an oil supply port of the servo valve is connected with the high-pressure oil source, an oil return port of the servo valve is connected with an oil tank, and a B port of the servo valve is blocked; an A port of the servo valve is connected with an A cavity of the actuating mechanism, the low-pressure oil source is connected with a B cavity of the actuating mechanism, the B cavity of the actuating mechanism is connected with an inlet of the overflow valve, and an outlet of the overflow valve is connected with the oil tank; and the actuating mechanism is connected with the elastic load. A setting principle of the pressure of the low-pressure oil source is that: the force generated by the low-pressure oil source in the B cavity of the actuating mechanism can offset the friction of the actuating mechanism. By the method and the device, the problem that the motion law is difficult to control accurately when the elastic load moves from maximum position to zero position, and energy sources can also be saved.

A pipe bending machine has a stiff-back which is driven by a pivoting wedge. A linkage applies force from the actuator to the wedge in a direction parallel to a longitudinal axis of the stiff-back. The stiff-back pivots on a first fulcrum and the wedge slides on a bed which pivots on a second fulcrum. The actuator drives the wedge between the stiff-back and the bed to rotate the stiff-back at the first fulcrum and bend the pipe seated in the stiff-back against the pipe bending face of a die. The conversion of the longitudinal force applied to the wedge into a transverse force applied to the stiff-back provides a significant mechanical advantage which varies directionally as the stiff-back rotates about its fulcrum to maintain a constant force on the stiff-back.

The invention relates a transmission mechanism achieving rapidly returning. The mechanism is used in an electro-hydraulic brake system and comprises a worm rod(8) and a worm wheel (9) which are meshed with each other, the worm rod(8) is used for transmitting brake assistance power generated by a motor (7) to the worm wheel (9), and the worm wheel (9) is used for transmitting the brake assistance power to a hydraulic brake main cylinder (6) through a secondary transmission mechanism which is connected with the worm wheel (9); the transmission mechanism further comprises elastic components used for providing torsional force, one ends of the elastic components are connected with the worm wheel (9), and the other ends of the elastic components are fixed; and when the transmission mechanism is at an original position, the elastic components exist preload, when the motor (7) generates the brake assistance power, the rotating of the worm wheel (9) enables the elastic components to generate torque, and the torque is opposite to the worm wheel (9) in rotating direction. Compared with prior art, the transmission mechanism achieving rapidly returning has the advantages of high returning speed, compact structure and the like.

The invention relates to a roll stand for hot-rolling or cold-rolling metallic strips. Said roll stand comprises back-up rolls and work rolls (2,3; 4,5) which are respectively positioned in chocks (6; 7) in a rotating manner. Each chock (6; 7) can be displaced on two sides in guiding devices (8) of the column frame (9) for adjusting the roll gap (10) and can be additionally displaced on at least one side for adjusting the play, by means of horizontal piston cylinder units (11) arranged in the column frame (9). The aim of the invention is to completely eliminate the play in the vertical guiding device (8) of the work roll chocks (6; 7) during the rolling. To this end, the chocks which are guided on at least one side of the column (9a) by means of the piston cylinder unit (11) arranged in the column frame (9) and by means of one respective support element (14) which is arranged on the front side of the piston (11a), can be pressed against the other side of the column (9b) and the guiding device (8) thereof without play when the vertical roll positioning drive is stopped, and can be released when the vertical roll positioning drive is switched on.

The invention discloses an axial ultrasonic vibration hydraulic bulging structure for a tubular product. The axial ultrasonic vibration hydraulic bulging structure for the tubular product comprises anupper die base and a lower die base which are arranged in parallel up and down, wherein a first guide column and a second guide column are arranged between the upper die base and the lower die base;the upper die base is provided with a first guide sleeve and a second guide sleeve which are arranged on the first guide column and the second guide column in a sleeving manner correspondingly; the upper die base is provided with an amplitude-change pole penetrating the upper die base; an energy converter is arranged at the end of the upper end of the amplitude-change pole, and a shaft pressing head is arranged at the end of the lower end of the amplitude-change pole; and a liquid filling base, a distance ring and a positioning ring are sequentially arranged on the upper surface of the lower die base from bottom to top. The axial ultrasonic vibration hydraulic bulging structure for the tubular product is simple in structure, convenient to dismount and mount, easy to operate, high in tubular product forming efficiency and low in needed shaft pressure and hydraulic pressure, the bulging length of a tubular product can be adjusted, and bulging of a special-shaped section pipe fitting is achieved.

The invention discloses an oil sprayer valve structure. The oil sprayer valve structure comprises a control plunger, a valve sleeve, a pore plate and a fastening valve seat, wherein the pore plate, the valve sleeve and the control plunger define a control cavity. The oil sprayer valve structure further comprises a first pressure buffering floating column and a second pressure buffering floating column which are vertically stacked on the top surface of the control plunger, and the first pressure buffering floating column and the second pressure buffering floating column are both cylindrical; the pore plate is provided with a pore plate oil outlet and a constraint hole matched with the first pressure buffering floating column and the second pressure buffering floating column; the constrainthole and the pore plate oil outlet communicate through a conical hole section and penetrate through the pore plate; the first pressure buffering floating column is completely arranged in the constraint hole; one part of the second pressure buffering floating column is arranged in the constraint hole; the first pressure buffering floating column and the second pressure buffering floating column canmove up and down in the constraint hole; the first pressure buffering floating column is provided with a first oil channel; the second pressure buffering floating column is provided with a second oilchannel; and the first oil channel is communicated with the control cavity through the second oil channel. The oil sprayer valve structure reduces pressure of oil twice, can solve the problem of cavitation damage of a high-pressure sprayer, prolongs the service life of the sprayer and accelerates action response.

The invention relates to the technical field of shield tunneling machines, in particular to a shield tunneling machine soil bin rapid stone removing device which comprises a gate assembly, the gate assembly comprises a gate body and a driving assembly used for opening and closing a gate, the gate assembly comprises a gate seat and a gate cover plate, and the gate seat and the gate cover plate are each of a rectangular frame structure. A rectangular opening of the gate cover plate is aligned with a rectangular opening of the gate seat, an opening and closing assembly used for the gate seat and the gate cover plate is arranged between the gate seat and the gate cover plate, the opening and closing assembly is installed on a driving assembly, and grooves are formed in the positions, located at the two ends of the rectangular opening, of the outer walls of the two sides, opposite to the gate seat, of the rectangular opening of the gate cover plate. And elastic supporting plates are fixed to the inner walls of the grooves, sealant is fixed to the outer walls of the sides, facing the opening and closing assembly, of the elastic supporting plates, oil channels are formed in the inner walls of the two sides, away from each other, of the two grooves located at the same height, and the service life of the sealant can be prolonged by reducing friction damage.

The invention discloses a single-column control valve of an ejector. The single-column control valve comprises a control plunger, a valve sleeve, a pore plate and a fastening valve seat, wherein the pore plate, the valve sleeve and the control plunger define a control cavity. The single-column control valve further comprises a pressure-relieving floating column, wherein the pressure-relieving floating column is cylindrical, and is provided with an axially-penetrating pressure-relieving oil outlet hole; the pore plate is provided with a restraining hole and a pore plate oil outlet hole; the restraining hole is formed in the lower part of the pore plate, and is matched with the pressure-relieving floating column; the pore plate oil outlet hole communicates with the restraining hole through aconical hole section, and penetrates through the pore plate; the pressure-relieving floating column is arranged in the restraining hole; an elastic retainer ring is arranged on an opening in the lower end of the restraining hole; and the elastic retainer ring limits up-down movement of the pressure-relieving floating column in the restraining hole. The single-column control valve can solve the problem of cavitation erosion damage of a high-pressure ejector, prolongs the service life of the ejector, and accelerates action response.

The invention provides a thermal management module for a vehicle and a method of operating the same. According to the thermal management module for a vehicle, a plunger assembly which reciprocates inthe internal space of a module main body is adopted to control the flow of a fluid medium, and the plunger assembly can be statically sealed with the module main body at different parts. Therefore, compared with the dynamic seal of a rotary valve in the prior art, the static seal realized by the thermal management module for the vehicle has the advantages that the sensitivity to vibration is lower, the requirements on the performance of materials and processing parameters are lower, and the leakage risk is lower. The thermal management module for a vehicle adopts only one plunger assembly, sothat the overall structure is relatively simple, the required space is small, and the cost is low. The plunger assembly of the thermal management module for a vehicle is characterized in that at leastthe outer contour of the section, intercepted in the axial direction, of the plunger head is the curve with the preset curvature, so that the hydraulic pressure, acting on the plunger head, of a fluid medium is reduced, and therefore driving force for driving the plunger assembly is saved.

The invention discloses a control valve of an injector. The control valve comprises an ejector body, a control plunger, a valve sleeve, an orifice plate and a fastening valve seat. The orifice plate,the valve sleeve and the control plunger form a control cavity. The control valve of the injector also comprises a pressure relief floating column, and the pressure relief floating column is cylindrical and arranged on the upper end face of the control plunger. The end, close to the control plunger, of the pressure relief floating column is provided with a notch part penetrating through the circumferential surface, and an oil outlet hole is formed in the other end of the pressure relief floating column. The oil outlet hole communicates with the notch part to form a connection channel, the orifice plate is provided with a constraint hole matched with the pressure relief floating column, the constraint hole communicates with an orifice plate oil outlet hole of the orifice plate, and the pressure relief floating column can move up and down in the constraint hole. According to the control valve, the problem of cavitation damage of the high-pressure injector can be solved, the service lifeof the injector is prolonged, and the action response is accelerated.

The invention discloses a self-adaptive charging drawing forming method capable of preventing inverse bulging fracturing, and relates to the field of charging drawing of hydraulic drawing presses. The novel self-adaptive charging drawing forming method capable of preventing inverse bulging fracturing is provided for solving the problem that inverse bulging fracturing is prone to occurring in the charging drawing process. Before sheets are thinned to the maximum extent, inverse bulging thinning of the sheets are controlled by controlling the magnitudes of hydraulic pressure (Fy) of a liquid chamber and tensile force (Fn). When the sum of the hydraulic pressure (Fy) of the liquid chamber and the tensile force (Fn) reaches a set value (F0), the sum of the hydraulic pressure (Fy) of the liquid chamber and the tensile force (Fn) increasing as the tensile depth increases is kept at the set value (F0) by reducing the hydraulic pressure (Fy) of the liquid chamber, so that the change law that the hydraulic pressure of the liquid chamber automatically adapts to the tensile force is achieved. When the inverse bulging height drops to a set value (H0) and inverse bulging disappears, the hydraulic pressure (Fy) of the liquid chamber is increased to a set value F1 until the drawing process is completed.

The invention discloses a combined electromagnetic chuck capable of self-centering, the combined electromagnetic chuck comprises a positioning device and a magnetic suction device, the magnetic suction device is arranged above the positioning device, the positioning device comprises a chuck and three groups of clamping jaws, the three groups of clamping jaws are arranged on the chuck at equal angles, and the magnetic suction device is arranged above the chuck. Compared with an existing electromagnetic chuck, the electromagnetic chuck is provided with the positioning device, a workpiece can be automatically aligned to the center through the positioning device so that machining can be facilitated, and the deviation prevention mechanism and the compensation mechanism are further arranged; on the other hand, when the electromagnetic chuck rotates at a high speed, a part of centrifugal force of the clamping jaws can be offset through the deviation prevention mechanism and the compensation mechanism, so that hydraulic force generated by the hydraulic device is reduced, and the shifting rod is prevented from being deformed and damaged.

The invention provides a braking system capable of regenerative braking and hydraulic braking of a vehicle and a control method thereof. The present disclosure provides, in at least one embodiment, a brake system including: a pedal master unit; an electric supercharger unit; a reaction plate that generates a pedal force when compressed by at least one of the operating rod and the motor piston; and a controller that senses a pressure change in the master cylinder after receiving a regenerative braking interrupt signal during cooperative braking of the vehicle, and compensates for a displacement of the motor piston by an amount corresponding to the pressure change.

The invention discloses a fuel injection valve assembly which comprises an injector body, a control plunger, a valve sleeve, a pore plate and a fastening valve seat; the pore plate, the valve sleeve and the control plunger define a control accommodating cavity; the fuel injection valve assembly further comprises a pressure releasing floating column; a radial raised line is arranged on the upper end face of the control plunger; a gap part at the lower end of the pressure releasing floating column is meshed and connected with the radial raised line in a clamping manner and is arranged on the topsurface of the control plunger; the two ends of the radial raised line protrude out of the side face of the control plunger and are in up-down sliding fit with an inner wall axial sliding chute of the valve sleeve; the inner wall axial sliding chute and a fuel inlet are positioned on the same straight line; a fuel outlet is formed in the other end of the pressure releasing floating column and communicates with the gap part to form a connecting passage; the pore plate is provided with a constraint hole matched with the pressure releasing floating column; the constraint hole communicates with apore plate fuel outlet of the pore plate; and the pressure releasing floating column can move up and down in the constraint hole. The fuel injection valve assembly can solve the problem about cavitation erosion damage of a high-pressure injector, prolongs the service life of the injector and accelerates action response, and fuel flows smoothly.