1341 results about "Inertia force" patented technology

The invention relates to the technical field of mechanical arm control, in particular to a mechanical arm and a control method thereof. The method comprises the following steps that real-time load information of all joints of the mechanical arm in the operation process is obtained, the acceleration and rotational inertia of the mechanical arm are monitored in real time, and real-time inertia force data are generated; the torque compensation amount needed by the mechanical arm is calculated according to the real-time inertia force data, and torque compensation control data are generated; performing dynamic analysis on the torque compensation control data, and performing real-time adjustment on the output torque of the servo motor based on the current load and inertia change condition to generate inertia compensation data; and the motion path and the motion speed of the mechanical arm are dynamically optimized according to the inertia compensation data, and path optimization data are obtained. Through real-time monitoring, dynamic adjustment and intelligent optimization, the operation precision, the movement efficiency, the stability and the self-adaptive capacity of the mechanical arm in the complex working environment are remarkably improved.

A work apparatus includes: a housing; a motor support unit designed separately from the housing, the housing being fixed to the motor support unit. A drive motor is designed as an electric motor for driving a tool and is attached to the motor support unit. A receptacle housing designed separately from the motor support unit for receiving at least one battery pack for supplying the drive motor with electrical power is fixed to the housing. The receptacle housing and the motor support unit are designed and arranged relative to each other in such a way that the receptacle housing is able to move relative to the motor support unit in order to reduce, in particular to prevent, direct transmission of inertial forces emanating from the receptacle housing to the motor support unit in the event of an impact load on the work apparatus.

The invention relates to the technical field of virtual reality, in particular to a virtual feedback force acquisition method based on virtual reality and corresponding electronic equipment. The virtual feedback force acquisition method comprises the following steps: S1, acquiring object information; s2, forming an agent point; s3, calculating a collision contact agent point; s4, calculating the contact depth; s5, virtual feedback force is calculated; the virtual feedback force in the step S5 is calculated by depending on a virtual force construction model, and the virtual force construction model is based on an improved mass-spring-damper system and comprises a nonlinear spring force model, a nonlinear damping force model and an inertia force model; according to the method, the contact depth when the object is in contact is obtained through a force feedback calculation method, accurate feedback force is constructed in combination with kinematics data of the object and a virtual force model, and real-time calculation and accurate transmission of the virtual force are achieved; the method is suitable for various complex virtual scenes and has high real-time performance and stability.

The invention provides a resonance type flow field sensor with an inertia force compensation structure. The resonance type flow field sensor comprises a substrate; the double-end fixed tuning fork is fixed in the middle of the base; the cilium supporting structure is suspended on the base and is positioned at one end of the double-end fixed tuning fork; the comb tooth capacitors are arranged on the substrate and located on the two sides of the double-end fixed tuning fork; the cilia is arranged on the cilia supporting structure; one end of the micro lever is connected with the cilium supporting structure, and the other end is connected with one end of the double-end fixed tuning fork; and the inertia force compensation structure is suspended on the base, is symmetrically arranged relative to the double-end fixed tuning fork, is connected with one end of the double-end fixed tuning fork, and is positioned between the micro lever and the double-end fixed tuning fork. According to the sensor, the change of an air flow field is captured through the cilia on the sensor, the resonant frequency is detected through the capacitor, the flow velocity of the flow field can be obtained, the inertia force compensation structure can compensate interference of inertia force on an output result, and the sensor can still output stable flow velocity of the flow field when being interfered by the inertia force.

An electronic system for controlling vibrations and / or inertial forces occurring at a plurality of areas of interest within an operating vehicle. The electronic device comprises circuitry configured to receive input data comprising sensor data from one or more environment sensors and / or one or more internal sensors; convert, by means of a machine learning system, the input data into actuator settings; and transmit the actuator settings to one or more actuators to control vibrations and / or inertial forces occurring at each of the plurality of areas of interest within the vehicle.

The invention relates to the technical field of life evaluation, in particular to a turbine blade life evaluation method which comprises the following steps: acquiring surface temperature gradient data of a turbine blade of a gas turbine, extracting the temperature change rate of each area of the blade, analyzing the influence of the temperature change rate on the local stress of the blade, and evaluating the life of the turbine blade. And calculating a thermal stress synthetic effect by combining the blade rotation inertia force and the aerodynamic load to obtain blade thermal stress distribution data. According to the method, the thermal stress synthesis effect is calculated by acquiring the temperature gradient data of the surface of the blade and combining the rotary inertia force and the aerodynamic load, the thermal stress distribution characteristics of the blade in different operation states can be accurately reflected, and the life attenuation rate is calculated by combining the current working condition, so that life prediction can be adjusted along with the operation states; the service life offset is calculated by analyzing the influence of the start-stop load of the gas turbine and comparing creep fatigue joint distribution, so that the influence of the running state of the gas turbine on the service life prediction can be dynamically updated in real time.

The invention relates to a low-oscillation impact inertia piezoelectric actuator and a driving method thereof, and belongs to the field of precision machinery. The impact inertia driver comprises a base unit, a driving unit and a guide rail sliding block. The driving unit is a flexible hinge mechanism with a rhombic displacement amplification mechanism and is connected with the guide rail sliding block through a screw; and the piezoelectric stack is embedded in the rhombic amplification mechanism. The driving method of the device comprises the steps that when continuous zigzag driving voltage is applied to the piezoelectric stack, certain waveform voltage is applied to the electromagnet to conduct power-on and power-off operation on the electromagnet, based on the inertial impact principle, the resultant force of impact inertia force and magnetic force is larger than the friction force between the flexible hinge mechanism and the friction block, and the sliding block generates linear stepping motion. The invention has the advantages of simple structure, easiness in processing, assembly and control, capability of realizing high-speed large-stroke and high-load output, and no rollback displacement. The method has good application prospects in the fields of micro-nano operation, precise instruments, precision machining and the like.

The invention provides a strong nonlinear simulation method and device suitable for a large floating fan, and the method comprises the steps: dividing a target floating fan into a plurality of body structures according to the model parameters of the target floating fan, so as to construct a multi-body model containing a plurality of degrees of freedom, and building a whole machine load and a motion transmission path; the aerodynamic load input of each body structure is calculated, and the nonlinear dynamic response of the blade is calculated according to the aerodynamic load input of each body structure; according to the coordinate transformation relation, the nonlinear dynamic response of the blade is converted into a whole coordinate system and input into a multi-body dynamic model of the whole machine, generalized active force and generalized inertia force of each body structure in the target floating type draught fan are obtained through calculation, and the motion response of each body structure of the target floating type draught fan is obtained through simultaneous solution. According to the scheme, the motion response of each body structure of the target floating fan can be accurately determined, so that the running state of the floating fan in the deep and far sea complex environment can be accurately evaluated.

The invention belongs to the technical field of underground structure tests, and provides a deep underground structure pseudo-dynamic test method and device.The method comprises the steps that a numerical substructure and a test substructure are constructed, and an interaction boundary is arranged between the numerical substructure and the test substructure; and compensating the boundary prediction data according to the inertia force compensation coefficient based on the numerical sub-structure in each loading process, and loading the compensated prediction data to the test sub-structure, so that the test sub-structure outputs prediction response data and updates the rigidity of the numerical sub-structure, and determining a target balance force according to the prediction response data based on the numerical simulation substructure, driving a next loading process by using the target balance force, and obtaining a dynamic response rule of the soil-structure system when respective boundaries of the numerical simulation substructure and the test substructure meet displacement coordination and force balance. According to the method, the initial stress state of the deep underground structure can be accurately simulated, and the accuracy of obtaining the mechanical response rule of the underground structure is improved.

The application discloses a control method and device of a grass collecting device and electronic equipment. The control method of the grass collecting device comprises the following steps: obtaining a grass unloading instruction; controlling the grass collecting box to move from a first position to a second position in a first direction according to the grass unloading instruction, wherein the first position is a position where the grass collecting box is in a closed state, and the second position is a position where the grass collecting box reaches a maximum opening angle; and controlling the grass collecting box to swing according to swing parameters, wherein the swing parameters comprise a swing angle, and the swing angle is smaller than the maximum opening angle. By using the control method of the grass collecting device, most of the grass clippings can be unloaded after the grass collecting box is lifted, and different direction inertial forces can be generated in the swinging process of the grass collecting box, so that a small amount of residual grass clippings can be removed through vibration, the situation that the grass is not completely unloaded is avoided, the grass unloading efficiency and effect are improved, and manual unloading operation is saved.

The present disclosure obtains a vehicle occupant restraint device capable of continuously restraining the shoulder of an occupant with a shoulder seatbelt as a reaction force member by supporting an airbag with a seatbelt regardless of the physique difference of the occupant during a frontal collision of a vehicle. The vehicle occupant restraint device includes: a seatbelt that restrains an occupant seated on a vehicle seat to the vehicle seat; and a seat belt support airbag which is inflated and deployed at least between a shoulder belt of the seat belt and a shoulder of the occupant by being supplied with gas from an inflator during a frontal collision of the vehicle, the shoulder belt moves toward the front side of the vehicle by following an occupant moving toward the front side of the vehicle due to inertia force, moves along the shoulder belt, and is maintained in a state of being interposed between at least the shoulder of the occupant and the shoulder belt.

The invention relates to the technical field of hydraulic system control, and discloses a fault diagnosis method and device for a hydraulic system of fully-mechanized mining withdrawing triangular area supporting equipment. The method comprises the following steps: acquiring real-time operation data of each oil cylinder through a hydraulic system sensor, extracting differences of motion states of the oil cylinders by adopting a time sequence analysis and principal component analysis method, and calculating quantitative indexes of inertia force distribution and non-uniform force distribution of the oil cylinders. And when the quantitative index exceeds a preset threshold value, identifying the abnormal oil cylinder by adopting a clustering analysis method, analyzing the correlation between the positioning deviation and the abrasion of the sealing element through a linear regression model, and calculating the occurrence probability of an early fault signal. The fault prediction grading result is generated based on the probability distribution, the oil cylinder control parameters are adjusted through the decision tree algorithm, the oil cylinder operation parameters are updated, dynamic adjustment of the hydraulic system and optimization of the supporting structure are achieved, the fault diagnosis precision of the hydraulic system is improved, and the stability and reliability of the supporting structure are ensured through real-time compensation control.

The invention discloses an intelligent layering and guiding device for highway tunnel fire smoke and a control method, and relates to the technical field of tunnel fire safety, a smoke flow Froude number is introduced as a direct control target, the parameter represents the ratio of smoke flow inertia force to buoyancy force, the numerical value directly determines the stability of a layering interface, and the layering interface can be directly controlled. The Froude number of each subarea of the tunnel is calculated in real time through a sensing network and is compared with a critical value calibrated through an experiment, when a real-time value is lower than the critical value, it is indicated that inertia force is relatively insufficient, the buoyancy effect is dominant, and instability and entrainment are likely to happen to an interface between a smoke layer and lower cold air, and then according to a control algorithm, the smoke layer and the lower cold air are controlled. The micro jet fan applies directional inertia force to a smoke layer by adjusting the angle and the speed, the intelligent induction smoke outlet optimizes local pressure difference and flow by adjusting the opening degree and assists in maintaining flowing, the smoke flowing state is actively locked in a stable layered flow interval, and mixing and sedimentation caused by flow state instability are prevented.

The invention relates to the technical field of gear shaft machining equipment, and discloses new energy direct drive motor gear shaft machining equipment and a machining technology.The new energy direct drive motor gear shaft machining equipment comprises a quenching pool and a lifting frame, the lifting frame is located above the quenching pool, and the quenching pool is filled with quenching oil; the bearing frame and the gear shaft body are driven by the driving assembly to rotate in the quenching oil in a reciprocating mode, the tearing effect of inertia force on a covering film on the surface of the gear shaft body is further enhanced through the rotation, more importantly, in the rotating process, the contact state of the surface of the gear shaft body and the quenching oil can be continuously changed, and the gear shaft body is prevented from being damaged. The gear shaft body is alternately exposed in the high-temperature oil area and the low-temperature oil area, and the alternate exposure mode can always ensure that the workpiece gear shaft body can be in contact with low-temperature quenching oil, so that the problem that the temperature of the quenching oil rises due to long-time contact with a high-temperature workpiece is effectively avoided, and a good quenching effect is ensured.

The invention discloses a five-axis machining cutter location linear interpolation optimization control method, which relates to the technical field of numerical control machining, and comprises the following steps: fitting a machining contour to generate a curve expression, determining an operation point sequence based on curvature distribution, and converting the operation point sequence into an actuator pose sequence; based on the model of a five-axis machining machine tool, a total transformation matrix from a base coordinate system to an actuator coordinate system is established through a D-H method, motion parameter changes caused by five-axis elastic deformation and inertia force are established based on the nonlinear beam theory and the Alembert principle, and a nonlinear axis body coupling motion equation is established; a correction expression is generated in combination with the Jacobian matrix, optimal unknown parameters in the correction expression are determined by introducing a quantum fluctuation simulated annealing algorithm, and a correction Jacobian matrix is generated; according to the actuator pose change of the adjacent operation points in the actuator pose sequence, the corrected Jacobian matrix is combined, the inverse kinematics algorithm is adopted to derive the motion parameter vector of the previous operation point, and higher-precision machining control is achieved.

The invention provides an internal thread and a threaded connection pair, and belongs to the technical field of threaded connection. The internal thread is a meter-made thread or an MJ thread, a thread profile line of the internal thread comprises a thread top, a straight line section, a thread bottom and a straight line section which are connected in sequence, the thread angle of the internal thread is 60 degrees, the thread pitch is P, the width of the thread top is defined as Cn, the width of the thread bottom is defined as Cn2, the thread height is defined as hn, Cn is larger than 0 and smaller than C0, # imgabs0 #, and C0 is the width of the thread top of the standard meter-made internal thread or the MJ internal thread. The tooth thickness of the internal thread teeth is reduced, the rigidity of the internal thread teeth can be reduced, the bending deflection of the internal thread teeth can be improved, and therefore when the thread connection pair bears alternating loads, the internal thread teeth can generate larger bending deformation to absorb inertia force generated by the alternating loads, and therefore the thread connection pair can bear the alternating loads. Therefore, the stress of the root of the external thread under the action of the alternating load is reduced, and the fatigue performance of the external thread is improved.

The invention provides an electric power steering active return control method and system, and belongs to the field of electric power steering systems.The electric power steering active return control method comprises the steps that in the rotating process of a vehicle steering wheel, zone control is conducted with the steering wheel rotating angle as the benchmark, and original request torque is obtained; estimating the inertia moment of the steering wheel in the steering wheel aligning process; and calculating the original request torque and the steering wheel inertia torque to obtain a corrected steering wheel torque, and correcting the steering wheel torque according to the corrected steering wheel torque. According to the technical scheme, the aligning torque error caused by rotating speed fluctuation of the steering wheel is eliminated, and particularly under the working condition that a driver is completely released from the hand, the stability of aligning control is remarkably improved.

A handle device for a vehicle includes a handle body, a latch release lever, a door latch device, an electric actuator and a lever push member. The handle body is driven from an initial position to a pop-up position by the electric actuator and is manually operated to a latch operation position. A latch of the door latch device is released by the latch release lever being driven to a latch release position. The lever push member rotates from an initial corresponding position and pushes the latch release lever toward the latch release position with an operation of the handle body. The lever push member is set with a moment of inertia to cancel an inertia force generated when a collision impact load is applied to the vehicle and to move the lever push member toward the latch release position.

The invention discloses a vibration excitation device, a vibration excitation system and a use method of the vibration excitation device, and relates to the field of engineering structure detection, and the vibration excitation device comprises a supporting frame which is used for being placed on a vibration-excited object; the supporting hinge is arranged on the supporting frame; one side of the lever is rotationally connected with the supporting hinge; the mass block is connected with the other side of the lever and is arranged on the support frame; the actuator is arranged on the supporting frame, and the output end of the actuator is connected with the lever; and the elastic piece is arranged on one side, hinged with the support, of the lever and is connected with the support frame and the lever. According to the vibration excitation device, the elastic force provided by the elastic piece fixedly installed on the supporting hinge side during resonance counteracts the inertia force, the actuator only needs to overcome the damping force, the reverse elastic force provided by the elastic piece can reduce friction damping, and the actuator power of the vibration excitation device is further reduced.

The invention discloses a combined sucker rod centralizer, and relates to the technical field of sucker rod centralizers, the combined sucker rod centralizer comprises an upper fixing sleeve and a centralizing assembly, the upper fixing sleeve is connected to the outer side of a sucker rod body in a penetrating and sleeving manner, the lower side of the upper fixing sleeve is connected with an upper adjusting mechanism capable of moving up and down, and the upper adjusting mechanism is connected with the upper side of the centralizing assembly. According to the combined sucker rod centralizer, the rotation effect of the centralizing assembly is automatically achieved through the inertia force of up-down movement of a sucker rod and rolling fit of the slope blocks and the balls, so that the contact points of the steel balls and the inner wall of an oil pipe are continuously and dynamically changed, and the situation that local concentrated abrasion is caused due to the fact that the contact points of a traditional centralizer are fixed is avoided; and through high-low position automatic matching of the first inclined plane block and the second inclined plane block, bidirectional stable supporting of the upper guide rod, the lower guide rod and the centralizing assembly can be achieved, the situation that the centralizing assembly is unstable due to inertia offset is avoided, and the operation stability of the device is guaranteed.

The invention discloses a tuned mass vibration damper with controllable damping, and relates to the field of vibration control of offshore wind power generation equipment structures. The mass damping unit is arranged in a suspended mode, the clamping ring is coaxially arranged, the electromagnetic damping units are evenly distributed in the circumferential direction of the clamping ring, and the electromagnetic damping units are connected with the mass damping unit through winding ropes which are arranged in a radial mode to form a multidirectional synergistic composite damping system; the mass damping unit generates reverse inertia force in vibration to restrain movement of the tower and drives the electromagnetic damping unit to act at the same time, the generator is driven to generate electromagnetic damping through the one-way bearing and the speed increaser, and lossless reset is achieved through the torsion ring. The device is integrated with an energy recovery unit, vibration energy is converted into electric energy to be stored, real-time regulation and control of damping force, omni-directional vibration response and energy feedback are achieved, and the vibration reduction efficiency and the energy utilization rate are remarkably improved.

A cone or cylindrical tube stack with narrow in-between gap circumferential surface swirling cyclone separator according to the present invention, creating swirling flow by flowing along the convex outer surface of the inner-stacked cone or cylindrical tube. The inner wall of the outer-stacked cone or cylindrical tube, which is a concave surface, serves as the wall for collecting fluid with larger or higher density particles that is opposite to the surface for swirling, which is disposed in accordance with the separation movement of larger or higher density particles that centrifuged from swirling by their inertial force. The distance that the particles travel towards the wall for collecting fluid with larger or higher density particles is short due to the narrow swirling and separating gaps, combined with the flow on the convex curved surface of the cone or cylindrical tube walls which pressure drag is low, this results in higher swirling speeds than those on the concave inner surface of conventional cyclone, significantly increasing the inertial force of particles centrifuged away from the swirling. Consequently, the separation efficiency of the cone or tube stack circumferential surface swirling cyclone separator according to the present invention is much higher than that of conventional cyclone separators. Especially in cases where the cyclone fluid separator according to the present invention is equipped with multi-stage separation, where the final stage utilizes multiple small cyclones, and in configurations where multiple cones are stacked and equipped with device for swirling and counter-flow separation, which convex fluid drainage ridges are installed on the wall for collecting fluid with larger or higher density particles, the ridges curving towards the side that the swirling flow flows to, sloping from the downstream edges of the cones or cylindrical tubes towards the upstream edges of the cones or cylindrical tubes, which counter to the swirling flow along the convex curved surface of the outer circumferential surface of cone or cylindrical tube. When working with a reverse swirling system, enabling to recycle multiple separation within the system before the fluid exits the separator, enabling high separation efficiency for separating various types of fluids mixed into emulsion or separating micron-level dust such as PM 2.5 from the air.

The utility model relates to a zero-gravity seat backrest collision energy absorption locking mechanism which comprises a backrest framework, a backrest connecting plate installed on the backrest framework and an angle adjuster installed on the backrest connecting plate, a fixed disc of the angle adjuster is installed on the backrest connecting plate, and a movable disc of the angle adjuster is connected with a cushion framework through a backrest energy absorption locking mechanism. The backrest energy absorption locking mechanism comprises an unlocking support connected with the recliner movable disc, the unlocking support is meshed with the rotating support, the cam locking piece drives the rotating support to be separated from the unlocking support, the exploder drives the cam locking piece to rotate and unlock, the pull wire is connected with the exploder and the cam locking piece, and the energy absorption friction disc is used for unlocking after a vehicle collides. The blocking point limiting mechanism is used for preventing the unlocking bracket from reversely rotating due to inertia force; the backrest energy-absorbing locking mechanism has the advantages that when the seat is collided at a zero-gravity posture position, the backrest can quickly return, so that the restraint protection on passengers is improved, and the injury caused by collision is reduced.

The utility model discloses a rolling device which comprises an installation frame, an upper roller and a lower roller, a crack for a pole piece to pass through is arranged between the upper roller and the lower roller, two ends of the upper roller are respectively connected with a first bearing seat, the two first bearing seats are installed on the installation frame in a sliding mode, two ends of the lower roller are respectively connected with a second bearing seat, and the second bearing seats are installed on the installation frame in a sliding mode. The two second bearing seats are installed on an installation frame, the upper roller and the lower roller are in transmission through a gear transmission mechanism, an ultrasonic transducer is arranged on the installation frame, the output end of the ultrasonic transducer is connected with the first bearing seat, and the ultrasonic transducer is used for driving the first bearing seat to vibrate up and down. According to the rolling device disclosed by the utility model, under the action of inertia force generated by high-frequency vibration of the upper roller, the pole piece is rolled and generates plastic deformation, particles in a coating displace, and pores are reduced, so that the surface density of the pole piece is increased.

The embodiment of the utility model provides a motorcycle engine which comprises a crankshaft, the crankshaft comprises a main journal, a primary driving gear assembly, crank throws arranged on the two sides of the axis of the main journal, and crankshaft balance blocks arranged on the two sides of the crank throws; the number of the crankshaft balance blocks is six, and the two sides of each crank throw are each provided with one crankshaft balance block. The crankshaft balance blocks on the two sides of the crank throw corresponding to each air cylinder balance the reciprocating inertia force and the rotating inertia force of the connecting rod piston assemblies of the corresponding air cylinders and the crank throw respectively, and meanwhile, the crankshaft balance blocks are matched with the rotating inertia force of the balance shaft to achieve complete balance of each connecting rod piston assembly and the crank throw. The primary driving gear assembly is provided with a primary driving gear buffer mechanism; according to the engine, the problems of vibration and unstable power transmission are solved, the problem that power is not smooth or flameout occurs during low-load output of a high-gear engine is solved, and the driving comfort and the driving smoothness are improved.

The invention relates to the technical field of reverse osmosis filtration, and discloses a reverse osmosis membrane filter element assembly and a use method thereof.The reverse osmosis membrane filter element assembly comprises two annular plates, a hollow cylinder is rotationally connected between the two annular plates, a motor is fixedly connected to the top of the upper annular plate, and the motor drives a large gear to rotate through a small gear on a first rotating shaft; the large gear drives the hollow cylinder to rotate, the hollow cylinder drives the first filter screen and the fixing plate to rotate when rotating, and the second filter screen slides in the sliding groove to extrude the spring to generate elastic force, so that the first filter screen and the second filter screen are staggered, the size of a filter screen opening is reduced, large particles in water are blocked in the first filter screen, and the filtering effect is achieved; when the hollow cylinder stops rotating, the filter screen II resets under the action of the elastic force of the spring, so that the filter screen openings are aligned, particles in the filter openings are thrown out under the action of inertia force, and filtered water flows into the next process through the water outlet, so that impurities are prevented from flowing out from the filter openings, and the filtering effect is improved.

The invention relates to the technical field of crane safety monitoring, and discloses a crane hoisting overload state monitoring method and system based on digital twinning, and the system comprises a twinning modeling module, a data acquisition module, a state simulation module, an overload decision module, and a model optimization and visualization module. Deep interaction between a physical world and a virtual space is realized through digital twin bodies, limitation of a traditional monitoring method is broken through, multi-source parameters such as wind speed, load and structural stress are fused for the first time, a dynamic coupling model is constructed, nonlinear correlation of wind load, inertia force and structural deformation is captured, the problem of missed judgment of hidden risks in the traditional method is solved, and the method has a wide application prospect. An accident early warning coverage range is expanded, a deflection calculation model is established based on an improved mechanical theory, high-sensitivity detection of fine deformation of the main beam is realized, compared with a static model, the magnitude order is improved, structural damage accumulation is effectively prevented, deep correlation mining is performed on historical and real-time data, and long-time-history advanced early warning of overload risks is realized.

The utility model discloses an inner cooling oil chamber, oil cooling piston and engine, including: inner cooling oil chamber body, including oil chamber body lower part and oil chamber body upper part, oil chamber body upper part at least includes first vortex area and second vortex area, first vortex area is closer to piston center than second vortex area, and the first vortex area is closer to piston center than second vortex area. The second vortex region is closer to the piston ring groove than the first vortex region. Engine oil is sprayed into the oil inlet channel through an engine oil pump and enters the inner cooling oil cavity body through the oil inlet channel. Along with rapid and high-frequency up-and-down movement of the piston, engine oil continuously collides with the upper wall face and the lower wall face of the inner cooling oil cavity body under the action of inertia force, part of the engine oil impacts the first vortex area to form a first vortex, and part of the engine oil impacts the second vortex area to form a second vortex. The contact area of engine oil and the inner cooling oil cavity body is increased, the flowing speed of the engine oil in the vortex area is higher, a better cooling effect is generated, the temperature of a piston can be more effectively reduced, and the phenomenon that the engine oil in the inner cooling oil cavity is coked is reduced.

The present invention is a minimum size, maneuverable, comfortable, safe, and inexpensive compact vehicle, having a higher level of cornering / turning stability than the current state of the art. The inventive design may be applied to two-, three-, and four- (or more) wheeled vehicles. The invention may be utilized in the design of the main components of vehicles providing an increased stability during turning, even at high speeds, based on fixed and moveable chassis portions which swing in relation to one another and novel linking mechanisms connected with large and / or wide wheel portions.

To improve protection performance with respect to a collision body while costs are reduced.SOLUTION: In a vehicle front structure S, a bladder 54 is provided on a rear side of a bumper cover 20 and is supported by a movable plate 52 from the back. The movable plate 52 is movably connected to an air guide 30. When a head-on collision between a vehicle V and a pedestrian (a collision body) occurs, a brake system of the vehicle V activates causing a movable plate 52 moving forward by an inertia to press and deform the bladder 54 boosting an air pressure inside the bladder 54. Thus, the bladder 54 whose internal pressure has risen can receive the pedestrian entering a front end part of the vehicle V. That is, the pedestrian can be received while the internal pressure of the bladder 54 which is filled with the air is increased. As a result, it is possible to absorb a collision energy of the pedestrian without using a gas generator for expanding the bladder 54.SELECTED DRAWING: Figure 3