2952 results about "Oil pressure" patented technology

The invention relates to the technical field of condenser welding, and particularly discloses an aluminum condenser welding device which comprises a workbench, a pair of sliding blocks are assembled on the workbench in a left-right sliding mode, a driving piece and a pushing piece which are matched with the sliding blocks are arranged on the workbench, and the sliding blocks are rotationally connected with the driving piece. A rotating piece for driving the sliding block to rotate to a vertical state is arranged at the joint of the sliding block and the driving piece; a wiping layer is arranged on the sliding block, the wiping layer is located above the sliding block when the sliding block is in a horizontal state, a plurality of ejector rods are arranged on the sliding block in a sliding mode, the ejector rods abut against the inner side of the wiping layer, an oil cavity filled with hydraulic oil is formed in the sliding block, the end of each ejector rod extends into the oil cavity, and a push plate is arranged on the side, away from the wiping layer, of the sliding block in a sliding mode. The push plate moves relative to the sliding block to adjust oil pressure of the oil cavity to drive the ejector rod to move. The aluminum condenser welding device has the effect of improving the welding efficiency and the welding precision.

The invention discloses an unmanned platform electromechanical system fault early warning method based on a Transform-BiGRU cross attention mechanism, and belongs to the technical field of fault early warning. The method comprises the following steps: acquiring parameters, and performing time sequence alignment and key feature screening; secondly, designing a parallelization spatio-temporal feature extraction framework: on one hand, capturing a long time sequence dependency relationship through a multi-layer Transform encoder, on the other hand, realizing bidirectional context modeling of a sequence by adopting a bidirectional gating circulation unit, and introducing an interpretable global attention mechanism to perform feature weight dynamic allocation on a BiGRU hidden layer state; and a cross attention feature fusion module is constructed for a Transform and BIGRU fusion problem, and cooperative characterization of a time sequence dynamic feature and a space correlation feature is realized through interactive attention calculation of a spatial-temporal feature tensor. By means of the method, advanced early warning from diesel engine lubricating oil pressure abnormity to whole ship electric power system cascade faults is achieved.

A power transmission device for a vehicle includes a housing that accommodates a power transmission mechanism, a control valve configured to control an oil pressure supplied to the power transmission mechanism, an oil pump configured to supply oil to the control valve, a partition section that divides an interior of the housing into a first chamber that accommodates the power transmission mechanism and a second chamber in which the control valve is arranged upright, and a communication path communicating between the first chamber and the second chamber. An opening area of the communication path is set so that an amount of the oil flowing from the second chamber into the first chamber through the communication path is less than an amount of the oil drained into the second chamber from the control valve while the vehicle is in motion.

The invention belongs to the technical field of hydroelectric generating set monitoring, and relates to a water turbine bearing temperature and lubricating oil state monitoring and fault diagnosis method and system. According to the method, triple-redundancy temperature measurement values of a water turbine bearing are adopted, multiple parameters are fused, redundancy design is adopted, sensor failure diagnosis is executed, a temperature-vibration-oil pressure combined feature space is constructed according to the triple-redundancy temperature measurement values and online oil quality parameters, a fault propagation map is established, and the fault propagation map is analyzed. And finally, based on the multi-level diagnosis model and in combination with the fault propagation atlas, composite fault mode recognition is realized, a fault classification result is obtained, and the composite fault mode recognition is realized based on the multi-level diagnosis model, so that the problems of low reliability, single monitoring dimension and insufficient fault recognition capability of a sensor in the prior art are effectively solved. And the equipment reliability and the operation safety are obviously improved.

The invention belongs to the technical field of drilling, and provides an active vibration reduction method and system based on self-adaptive adjustment of a drill rod load in order to effectively reduce vibration of a drill rod. A real-time feeding oil pressure signal is converted into real-time feeding thrust, and a real-time rotating oil pressure signal is converted into real-time rotating torque; filtering the original vibration signal by adopting a singular value subspace decomposition method to obtain a real vibration signal; according to the preset initial value of the feeding thrust and the preset initial value of the rotating torque, a neural network self-adaptive PID control algorithm is used for conducting self-adaptive comparison calculation, the vibration adjustment amount is obtained, and active vibration reduction is conducted according to the vibration adjustment amount; the system comprises six closed-loop control modules including a preset parameter input module, a signal acquisition module, a signal filtering module, a control algorithm module, a control output module and an execution module, accurate vibration reduction control is achieved, the bounce phenomenon of a drill bit is eliminated, the deviation error of a drill hole is reduced, meanwhile, stick-slip vibration is restrained, and the clamping stagnation failure rate of a drill rod is greatly reduced.

The invention provides a driving station state monitoring system for a gravity energy storage transportation track, and relates to the technical field of intelligent control, and the system comprises a calculation module which is used for responding to a primary early warning signal, collecting the real-time oil pressure data of a gear box, a bearing temperature rise rate curve and a dynamic torque feedback value of a target standby driving station, and calculating an availability index; the correction module is used for determining the position of a gearbox input end flange and a driving motor output end coupler as a first monitoring point and the position of connection between a bearing seat and an output shaft as a second monitoring point on a transmission link of the target standby driving station, and respectively calculating the axial temperature gradient difference and the radial vibration energy ratio between the two monitoring points; and generating a dynamic correction value through a preset coupling coefficient, and compensating the availability index based on the dynamic correction value to obtain a corrected index. The operation reliability of the gravity energy storage system can be improved.

The invention discloses a ship steering engine fault early-warning method based on sparse Bayesian, and the method comprises the steps: collecting the data, such as a rudder angle instruction, an actual rudder angle, steering engine response, motor current, oil pressure, ship speed, ship posture, sea condition grade, in a navigation process, and constructing a time window monitoring sample set through time alignment and normalization; steering engine response features are extracted and spliced with the working condition features to form working condition feature vectors, steering engine state labels are marked in combination with maintenance records to form a training sample set, and an adaptive sparse Bayesian early warning model with working condition related sparse priori is trained; and generating a current working condition feature vector in real-time navigation, inputting the current working condition feature vector into the model to obtain a steering engine fault risk value, and selecting a self-adaptive early warning threshold value according to a sea condition grade to output a fault early warning result. According to the invention, the false alarm rate is reduced and the early fault identification capability is improved under complex sea conditions.

The invention relates to the technical field of transformer heat dissipation, in particular to an oil cooling radiator for a transformer, which comprises a shell, an oil conservator, a telescopic driving piece, cooling fins and the like, electrical elements are arranged in the shell; an oil conservator used for stabilizing the oil pressure in the shell is arranged on the shell; the oil conservator is communicated with the interior of the shell; a plurality of telescopic driving pieces are arranged on the shell; the telescopic ends of every two telescopic driving pieces which are opposite in the front-back direction are jointly and fixedly connected with a plurality of cooling fins used for conducting heat dissipation on insulating oil. The cooling fins are made of heat conduction materials. And each radiating fin is of a hollow structure. The oil leakage part of the welding seam of the cooling fin is blocked through the rubber scraping strip and the blocking plate, insulating oil is prevented from continuously leaking, the insulation performance of electrical components in the transformer is prevented from being reduced, faults such as short circuit and discharge caused by insufficient insulation strength are reduced, and meanwhile it is avoided that follow-up maintenance work is affected by insulating oil leakage.

The utility model discloses a brake device for a tensioning oil cylinder, and belongs to the technical field of brake equipment. The brake device comprises a cylinder body, a piston, a brake ball, a brake cylinder and an elastic piece, a piston rod penetrates through the cylinder; the piston, the brake cylinder and the elastic piece are all arranged in the cylinder body, the bottom of the elastic piece is connected with the cylinder body, the brake cylinder is arranged above the elastic piece, and the piston is arranged above the brake cylinder; the brake ball can abut against the inner wall of the brake cylinder and the outer wall of the piston rod. A sealing cavity is formed between the cylinder body and the piston; and an oil inlet nozzle communicated with the sealing cavity is arranged on the cylinder wall of the cylinder body. The brake device opens the brake by using the pressure of hydraulic oil and holds the brake by using the restoring force of the elastic piece, so that the stability of the telescopic state of the piston rod is improved; and the brake opening or contracting time can be flexibly adjusted according to the change speed of the oil pressure. The utility model belongs to a normally closed brake structure, and meets the mechanical safety performance requirements of products.

The utility model provides an open-loop controlled multifunctional hydraulic pulse test bench, which comprises a storage oil tank, an oil supply pump machine, a reversing valve, a pressurizing oil cylinder and an oil supplementing overflow valve, according to the test bed, a large amount of oil flows into a system at the moment that an oil way is opened by a reversing valve, and due to the fact that an overflow valve has a lag phenomenon in response, oil pressure instantaneously generates an overshoot peak value, pressure in a pipeline rapidly rises and a pressure peak appears, then the overflow valve is conducted, the oil is guided out along the overflow valve, and the pressure in the system is reduced to the set pressure of the overflow valve; water hammer waves and rectangular waves of various waveforms and frequency bands can be generated by adjusting the diameter of a variable damping hole of the one-way throttle valve and the rotating speed of the motor, so that the hydraulic pulse test bed can form hydraulic pulse waveforms of various waveforms and frequency bands; the set pressure of the overflow valve is increased, meanwhile, the travel switch loses efficacy, and when the reversing valve is located at the right position all the time, a damage test can be conducted on the hydraulic pipeline to measure the maximum pressure value capable of being borne by a tested piece.

A power transmission device for a vehicle includes a housing that accommodates a power transmission mechanism, a control valve configured to control an oil pressure supplied to the power transmission mechanism, a first pump and a second pump configured to supply oil to the control valve. The housing includes a first chamber that accommodates the power transmission mechanism and the first pump, and a second chamber that is arranged adjacent to the first chamber in a horizontal line direction. In the first chamber, the first pump is arranged such that an axis of rotation of the first pump extends along a direction of an axis of rotation of the power transmission mechanism. In the second chamber, the control valve is arranged upright. In the second chamber, the second pump is arranged upright with an axis of rotation of the second pump extending along a vertical direction.

To provide a hydraulic vibration isolator having a poppet valve, which comprises a safety function for preventing damage due to overload, and can be easily replaced with an existing product without increasing the size of the existing product.SOLUTION: A poppet valve device 9 comprises a valve case 11, a valve body 13 that opens and closes a valve seat 11a opening into the valve case 11, and a spring 14 that biases the valve body 13 in an opening direction. The valve case 11 comprises: a flange part 11b that is housed in an outer case 10 communicating with an oil passage 8, slidably penetrates a relief valve seat 10a that opens into the outer case 10 to branch off and merge with the oil passage 8, and abuts against the opening peripheral edge of the relief valve seat 10a; and a relief oil passage 11c formed between a side part and an inner wall of the outer case 10 by cutting out a side part. The valve case 11 is biased by a spring 12 in a direction of closing the relief valve seat 10a. In the poppet valve device 9, excessive oil pressure causes the flange part 11b of the valve case 11 to separate from a valve seat 10a of the outer case 10, and the oil pressure is released through the relief oil passage 11c.SELECTED DRAWING: Figure 5

The invention relates to the field of spinning equipment, and provides a large-scale vertical spinning machine which comprises a machine tool assembly, a spindle assembly and a spindle assembly, the machine tool assembly comprises a machining station and a suspension seat, and an oil storage cavity used for storing oil is formed in the machining station; the clamp unit comprises a main shaft and a rotary driving mechanism, and the main shaft is rotationally installed on the machining station through a bearing mechanism; the main shaft is provided with a clamp seat for fixing a blank; the rotary driving mechanism is in transmission connection with the main shaft for controlling the main shaft to rotate; the first oil system comprises a first oil pressure station arranged on the suspension seat, the first oil pressure station is connected with a first oil feeding pipeline and a first oil pumping pipeline, and the end, away from the first oil pressure station, of the first oil feeding pipeline is connected to the bearing mechanism; the end, away from the first oil pressure station, of the first oil pumping pipeline is connected to the machining station and communicates with the oil storage cavity. On the basis, the spinning machine main shaft is lubricated in a circulating oil supply mode, the heat dissipation effect of the main shaft can be improved, and the possibility that the main shaft breaks down or is damaged is reduced.

The invention discloses a pumping unit intelligent lubrication decision making system and method based on multi-source data fusion, and the system obtains multi-source data, such as the rotating speed, the torque, the oil temperature and the oil pressure, and the viscosity, the pH value and the water content of lubricating oil, during the operation of a pumping unit through a multi-source data collection unit, and carries out the processing through a data transmission and preprocessing unit. Data features are deeply mined by means of an improved multi-layer perceptron feature extraction unit, feature fusion is carried out on data of an optimized Transform model fusion unit and a historical data storage unit, and a lubrication decision model construction unit constructs correlation models of lubricating oil viscosity, lubrication period and the like based on the fused features. And finally, the lubrication decision execution unit outputs and executes a decision instruction. The method executes the steps of data acquisition, processing, feature extraction, fusion, model construction and decision execution corresponding to each unit of the system. The problems of lubricating oil waste and insufficient lubrication are avoided, and the operation efficiency and the intelligent operation and maintenance level of the pumping unit in oilfield exploitation are remarkably improved.

The utility model relates to a pod propeller steering sealing system with monitoring and leakage recovery functions, which comprises a steering sealing device body, a pressurized oil lubricating device, an air supply device and a leakage recovery device, the pressurized oil lubricating device is connected with the steering sealing device body and used for providing lubricating oil, and the air supply device is connected with the leakage recovery device. A lubricating medium is provided for the lip-shaped sealing ring in the steering sealing device body, meanwhile, appropriate oil pressure is provided for a sealing cavity in the steering sealing device body, and seawater leakage or lubricating oil leakage when the lip-shaped sealing ring loses efficacy is prevented. The air supply device is connected with the pressurized oil lubricating device and the steering sealing device body and used for providing compressed air and adjusting and monitoring the pressure and flow of the needed compressed air. The leakage recovery device is connected with the steering sealing device body and used for monitoring the leakage condition of the steering sealing device body and discharging leakage of the steering sealing device body to the hull collecting box. According to the steering sealing system, the reliability of the pod propeller is further improved, and the pollution of lubricating oil to the environment is reduced.

The utility model discloses a novel supporting leg control valve which comprises a control module assembly and a plurality of oil cylinder supporting legs, and two hydraulic pipes are installed between the control module assembly and the oil cylinder supporting legs in a communicated mode. The hydraulic control one-way valve is additionally arranged on the hydraulic pipe of the rod cavity, the hydraulic control one-way valve is of a cone valve structure, internal leakage is small, oil pressure of the rod cavity can be effectively kept, the hydraulic control one-way valve is slightly different from a device without a hydraulic control one-way valve in the prior art during normal work, but after the device is stored for a period of time, the hydraulic control one-way valve is not damaged. The hydraulic control one-way valve with a rod cavity can play a role in keeping, so that a piston rod cannot extend out due to leakage of an oil cylinder, the problem is generally solved in an electric control mode in the prior art on an aerial work platform with supporting legs, and the defect is that the problem of time delay occurs during walking. The problem that the oil cylinder leaks and stretches out is solved in a hydraulic mode, and walking can be achieved without the landing leg contraction action in the walking process.

The invention belongs to the technical field of engineering elements, and discloses a pressure selection valve, a pressure stop valve structure and a hydraulic system. The pressure selection valve at least comprises a valve sleeve, a first valve element and a second valve element, the valve sleeve is at least provided with a first oil port and a second oil port, the first oil port and the second oil port are communicated with an inner cavity of the valve sleeve, and the first valve element and the second valve element are sequentially arranged in the inner cavity in a sliding mode. When the oil pressure at the first oil port is larger than that at the second oil port, the first valve element can abut against and push the second valve element, so that the second valve element can stretch out through the first opening and abut against and push an external stress piece. When the oil pressure at the first oil port is smaller than the oil pressure at the second oil port, the first valve element and the second valve element are far away from each other, and the second valve element can stretch out through the first opening and abut against an external stress piece. According to the pressure selector valve, a conical surface sealing structure is omitted, the machining difficulty of the hole and the valve element is reduced, the machining cost is saved, and the pressure selector valve has good economical efficiency.

The invention relates to a driving, braking, rotating and suspending integrated shaft module and a variable-configuration drive-by-wire chassis formed by the driving, braking, rotating and suspending integrated shaft module, the driving, braking, rotating and suspending integrated shaft module comprises a single-wheel driving module, and the single-wheel driving module comprises a profile frame and angle modules arranged on the profile frame in a mirror symmetry mode; the angle module comprises a driving module, a suspension module, a braking module and a steering system; wherein the driving module comprises a hub motor, a tire arranged on the hub motor and a battery for supplying power to the hub motor; the suspension module comprises a steering arm, an upper swing arm, a lower swing arm and a damping spring, wherein the first ends of the upper swing arm and the lower swing arm are hinged to the steering arm. The brake module comprises a brake pump, an oil pressure distributor connected with the oil output end of the brake pump, brake calipers and a brake disc. Wherein the steering system comprises a steering motor and a lower steering engine driven by the steering motor to act, and the end part of the lower steering engine is connected with the steering arm; the driving, braking, rotating and suspending integrated shaft module and the variable-configuration drive-by-wire chassis formed by the driving, braking, rotating and suspending integrated shaft module are reasonable in design and high in expansibility.

The invention discloses a power plant direct-current oil pump motor control loop low-oil-pressure self-starting pressing plate adjusting system, particularly relates to the field of direct-current oil pump pressing plate adjustment, and comprises a pressing plate state monitoring module, a working condition decision module, a soft start execution module, a hard start straight-through module and a transient protection module. According to the low-oil-pressure self-starting pressing plate adjusting system of the power plant direct-current oil pump motor control loop, forced locking is achieved through the pressing plate state monitoring module when a pressing plate does not exit, and the risk that an armature winding bears full-pressure impact and counter electromotive force impact when an IGBT is not ready is avoided; soft start and hard start are distinguished through the working condition decision module, and response delay of a single soft start strategy in an emergency is avoided; the IGBT conduction angle climbing rate is dynamically adjusted through a PID control algorithm by means of a soft start execution module, a programmable timer controls time sequence switching of a contactor, smooth progressive climbing of motor current is achieved, bus voltage is stabilized, and current impact and back electromotive force influence in the starting process are reduced.

A power transmission device for a vehicle includes a housing that accommodates a power transmission mechanism, a control valve configured to control an oil pressure supplied to the power transmission mechanism, a first pump and a second pump configured to supply oil to the control valve. The housing includes a first chamber that accommodates the power transmission mechanism and the first pump, and a second chamber that is arranged adjacent to the first chamber in a horizontal line direction. In the first chamber, the first pump is arranged such that an axis of rotation of the first pump extends along a direction of an axis of rotation of the power transmission mechanism. In the second chamber, the control valve is arranged upright. In the second chamber, the second pump is arranged upright with an axis of rotation of the second pump extending along a vertical direction.

The utility model discloses a clutch booster with a hydraulic damping valve, which comprises a clutch booster assembly, the clutch booster assembly comprises a hydraulic cylinder, and the hydraulic cylinder is connected with the hydraulic damping valve which is used for damping hydraulic pressure sudden change or pressure wave crest in the hydraulic cylinder. The hydraulic cylinder is connected with the hydraulic damping valve, hydraulic oil pressure generated in sudden change or pressure wave crests, especially instantly generated by the sudden change or pressure wave crests, is transmitted to the hydraulic damping valve, sudden change pressure change in the hydraulic cavity is balanced through the hydraulic damping valve, and pressure generated after sudden change or wave crests is reduced and directly transmitted to the clutch. The hydraulic pressure in the hydraulic cylinder is stably output, the influence of sudden pressure change (especially increase) and overlarge pressure wave crest generated in the hydraulic cavity on product control hydraulic stability is avoided, and then the influence of unstable product output pressure is avoided.

A power transmission device includes a case that houses a power transmission mechanism, a control valve configured to control an oil pressure supplied to the power transmission mechanism, and an electric pump configured to supply oil to the control valve. The case has a first chamber that houses the power transmission mechanism, and a second chamber that is arranged adjacent to the first chamber. The control valve and the electric pump are arranged upright in the second chamber. In the case, a first recess that is recessed from above the electric pump toward the electric pump is formed in a region that overlaps the electric pump, as viewed from above along an axis of rotation of the electric pump, and a connector of the electric pump is arranged such that a connection part with a mating connector faces up in the first recess.

The present invention discloses a progressive adjustable switching valve, belonging to the technical field of oil pressure valve blocks, which includes a first block, a tail block and a plurality of intermediate blocks. An upper valve block is installed on the upper surface of the first block, each intermediate block and the tail block to form a combined valve body; a propulsion oil passage, a circulating propulsion oil passage, a discharge oil passage and a circulating discharge oil passage that are circulated and interconnected are arranged in the combined valve body. The present invention divides the output oil pressure of the lubricating oil pump into multiple paths and automatically outputs them one by one in a single path to ensure that the lubricating oil with sufficient pressure is output in each path; at the same time, each single valve block is convenient to manufacture and can be combined in various ways, with good flexibility to adjust different oil output volumes.

The invention relates to the hydraulic technical field of hydraulic engineering, and discloses a hydraulic cylinder intelligent oil supply control system and method applied to hydraulic engineering. The system comprises a hydraulic parameter acquisition module, a data fusion processing module, a manifold state modeling module, a dynamic risk prediction module and a self-adaptive oil supply control module. The hydraulic parameter acquisition module is used for acquiring multi-point oil pressure, piston displacement and oil supply flow monitoring signals in real time; the data fusion processing module is used for fusing the multi-source heterogeneous signals; the manifold state modeling module constructs a hydraulic cylinder operation state Riemannian manifold geometric model based on the fusion signal; the dynamic risk prediction module calculates a real-time abnormal aggregation degree index according to the geometric feature vector; and the self-adaptive oil supply control module generates an oil supply control instruction according to the abnormal aggregation degree index. The system can comprehensively sense the operation state of the hydraulic cylinder, accurately model and predict risks, dynamically adjust oil supply parameters, and meet the requirements of modern hydraulic engineering operation.

The invention relates to the technical field of bearing tests, in particular to a loading device and a loading method for a low-temperature bearing test of a spaceflight turbine pump. Comprising a test shaft shell, a test bearing A, an axial loading gland, an axial loading piston cylinder shell, an axial loading piston, a variable-diameter piston cylinder shell, a variable-diameter piston cylinder piston, a vaporizer, a test bearing B, a liquid nitrogen pipeline, a nitrogen pipeline and a hydraulic oil pipeline. Liquid nitrogen enters a test shaft shell from a liquid nitrogen pipeline to be fully cooled and then is discharged, the liquid nitrogen is converted into nitrogen through heat exchange of a vaporizer, the nitrogen is introduced into a variable-diameter piston cylinder shell through a nitrogen pipeline to push a variable-diameter piston cylinder piston to compress hydraulic oil, and the hydraulic oil is introduced into an axial loading piston cylinder shell to generate oil pressure to push an axial loading piston to move. The axial loading piston generates thrust on the axial loading gland to promote the axial loading gland to complete thrust loading on the test bearing, the electric cylinder is adopted to directly apply push-pull force load to the variable-diameter piston rod, load fluctuation is compensated, and stability of the test load is guaranteed.

The utility model discloses an efficient oil pressure type plywood continuous forming press which comprises an installation frame, first oil cylinders are fixedly arranged on the outer walls of the two sides of the installation frame respectively, installation plates are fixedly arranged at the output ends of the two first oil cylinders respectively, limiting assemblies are arranged on the two installation plates respectively, and a U-shaped frame is fixedly arranged on the installation frame. A second oil cylinder is fixedly arranged at the top of the U-shaped frame, a sleeve is fixedly arranged at the output end of the second oil cylinder, a telescopic column is arranged at the bottom end of the sleeve, a connecting plate is fixedly arranged at the bottom end of the telescopic column, a plurality of U-shaped plates are fixedly arranged on the connecting plate, and pressing rollers are arranged on the U-shaped plates. The output end of a second oil cylinder drives a sleeve to move downwards, the multiple pressing rollers make contact with plywood to press the plywood, continuous pressing is conducted through the multiple pressing rollers, it is guaranteed that the pressure is evenly applied, the continuity is high, a first spring is arranged, a telescopic column can be buffered upwards, then the pressure applied to the plywood by the multiple pressing rollers cannot be overloaded, and the service life of the plywood is prolonged. And the plywood is prevented from being damaged.

The invention discloses a high-performance sealing mechanism and sealing method for an oil cylinder of a hydraulic excavator, and relates to the technical field of oil cylinder machining. According to the high-performance sealing mechanism for the oil cylinder of the hydraulic excavator, through the linkage design of the annular bearing plate and the driving rod, the contact pressure between the sealing piece and the inner wall of the cylinder barrel is automatically adjusted and strengthened through the hydraulic oil pressure, and when the hydraulic oil pressure rises, the annular bearing plate pushes the driving rod; the top plate tightly abuts against the reinforcing sealing piece, the self-adaptive effect that the larger the pressure is, the stronger the sealing performance is is achieved, and therefore the good sealing effect can be kept in the environment that the pressure of the oil cylinder changes rapidly. The two sides of the piston body are each provided with a structure for self-adaptively changing the contact pressure between the reinforcing sealing piece and the inner wall of the oil cylinder according to the hydraulic oil pressure change, so that the hydraulic oil can achieve the effect of enhancing the sealing performance through hydraulic oil power in any direction. The combined design of the basic sealing piece and the reinforced sealing piece forms a double-sealing barrier.

The invention discloses a wet clutch of a hydraulic mechanical transmission for a vehicle and the vehicle, and belongs to the technical field of vehicle clutches, the wet clutch comprises a turbine shaft, the left end of the turbine shaft can be connected to a hydraulic torque converter, the right end of the turbine shaft is provided with a transmission part, the transmission part can be connected to a mechanical gearbox, and the transmission part comprises a clutch outer hub; the clutch outer hub is connected to the turbine shaft in a sleeving mode, and a piston, a friction plate, a dual plate and an output gear are sequentially arranged on the clutch outer hub in the transmission direction. The piston can be controlled by oil pressure to move rightwards so as to press the dual plate and the friction plate; the piston is further provided with a spring set, and the spring set is used for resetting the piston. The wet clutch is provided with a lubricating system and an oil pressure system, and the oil pressure system is provided with a proportional electromagnetic valve. A dry clutch can be replaced at the same position, the axial size is smaller than that of the dry clutch, the chassis space is saved, the torque requirement within a certain range is met, the cost is reduced, gear shifting is more stable and smooth, and the driving experience is improved.

The invention relates to a sealing structure, in particular to a combined sealing structure for an output shaft of a marine gearbox. The problem that an existing sealing component can cause leakage under the conditions that an output shaft is static, low in speed, large in lubricating oil amount, too large in oil pressure and the like is solved. A three-stage combined sealing structure is formed by the oil slinger, the labyrinth sealing ring and the lip-shaped sealing assembly. The oil slinger arranged on the output shaft is simple in structure, convenient to transform and good in economical efficiency. The labyrinth sealing ring not only can meet the sealing requirement of a rotating part, but also has self-adaptive flexural deflection, and can be automatically adjusted in a limited manner, so that a good sealing effect is achieved. The lip-shaped sealing assembly structurally achieves the bidirectional sealing effect, internal lubricating oil can be sealed, and water, dust, silt and other external impurities are prevented from entering the gearbox. Through the application of the combined sealing structure, leakage is reduced step by step. The invention belongs to the technical field of gearbox sealing.

The automobile part torsional fatigue test bench comprises a bench body, a driving mechanism is arranged at one end of the top surface of the bench body, a workpiece carrying structure is arranged at the other end of the top surface of the bench body, a force application structure is arranged at the position, close to the driving mechanism, of the top surface of the bench body, and the driving mechanism comprises a driving bin. The end, away from the force application structure, of the driving bin is fixedly connected with a servo motor, and the two sides of the middle of the interior of the driving bin are fixedly provided with a cycloidal-pin wheel speed reduction assembly and a planetary speed reduction assembly correspondingly. The driving mechanism is driven by the servo motor, a huge oil supply hydraulic system does not need to be used, the occupied area is small, the output torsion load can be switched through the cycloidal-pin wheel speed reduction assembly or the planetary speed reduction assembly, the load output through the planetary speed reduction assembly is low, constant loads can be repeatedly applied to a workpiece for a long time, and the working efficiency is improved. The output load of the cycloidal-pin wheel speed reduction assembly is high, destructive testing of the maximum load can be carried out, and two detection modes can be considered.