142results about How to "Achieve braking effect" patented technology

The invention relates to a modularized series joint of a collaborative robot. The modularized series joint comprises a joint shell as well as a hollow motor, a harmonic reducer, an input shaft, an output shaft, a torque sensor, a brake, an absolute value encoder and a driver which are arranged in the joint shell, wherein the harmonic reducer, the hollow motor, the brake, the absolute value encoder and the driver are sequentially connected to the input shaft in series. A joint structure disclosed by the invention is more compact in structure, low in cost, higher in safety and reliability, ingenious, modularized and integrated; a brake structure is simple, convenient to install, reliable in brake performance, and stable; a force feedback system is sensitive in performance, stable, and high in reliability; and in addition, central hole wiring is used for wiring and arrangement, so that wire arrangement is more reasonable, and the wiring is more convenient.

The invention discloses a magnetic control brake device of a flywheel of an exercise bicycle. According to the device, the peripheral ring of the flywheel is made of a non-ferrous magnetic metal ring, and then, a plurality of pairs of permanent magnets capable of generating stationary magnetic fields are arranged a U-shaped groove of a magnetic control substrate located above the flywheel, and a brake regulating stem assembly is capable of regulating the position of the magnetic control substrate relative to the flywheel in a vertical direction, so that the depth of the metal ring of the flywheel to enter the U-shaped groove of the magnetic control substrate is controllable. As closed loop-type induced current can be generated in the metal ring when magnetic induction lines of the stationary magnetic fields are cut without stop by the metal ring of the flywheel when the flywheel rotates at a high speed, and the metal ring can be hindered from rotating by interaction forces between the stationary magnetic fields and induced magnetic fields generated by the induced current, the rotation of the flywheel is decelerated and even stopped to reach a brake effect. The brake device has the advantages that the structure is simple, potential damage cannot be caused to hands of an operator, the brake resistance is controllable, and meanwhile, the use and the maintenance are extremely convenient.

The invention relates to a reverse pedaling brake mechanism for an electric bicycle. A crank shaft in positive rotation can drive a crankset to rotate positively through a driving ring, then each of the crankset and the driving ring drives a magnet fixing seat to rotate synchronously while dislocation of two magnets fixed onto the two magnet fixing seats is avoided to enable a motor to provide assistance. The crank shaft in reverse rotation can drive the driving ring to rotate relative to the crankset and generates a delay time to enable one of the magnet fixing seat driven by the driving ring to rotate relative to the other magnet fixing seat within the delay time, the two magnets are forcedly dislocated, the assistance provided by the motor is cut off when dislocation between the two magnets is sensed by two magnetic sensors, and finally the driving ring continues to drive the crankset to rotate reversely to brake.

The invention provides a magneto-rheological effect-based elevator braking device with the automatic protection function and an elevator braking method. The device adopts a structure combining a permanent magnet and common magnet exciting coils. On the normal operation condition, the braking torque of a brake is controlled by controlling currents of the magnet exciting coils, on the emergency conditions, the permanent magnet can move towards the direction of magneto-rheological fluid under the pressure of a reset spring by cutting off compressed air entering a permanent magnet-air inlet cylinder, and therefore a magnetic field of the permanent magnet can be exerted on the magneto-rheological fluid, then the braking torque can be generated and the braking effect can be realized. According to the magneto-rheological effect-based traction elevator braking device, an internal cooling liquid flow channel is used for dissipating heat, the magneto-rheological fluid can be maintained within a low temperature range, and good control performance and good stability performance can be obtained. The magneto-rheological effect replaces an original mechanical brake, and therefore control over the braking device is simple and reliable.

The invention relates to braking spiral paint spraying equipment which mainly comprises a workbench and a placing groove. A circular first control rack is arranged at the front upper end of the placing groove, and a first spiral groove is formed in the first control rack. A second control rack is arranged over the first control rack, and a rectangular groove with the same centroid as the second control rack is formed in the second control rack. A spray gun is mounted in the rectangular groove in a sliding mode in the length direction, and the lower end of the spray gun extends to penetrate through the first spiral groove. A first straight gear ring is arranged on the outer arc-shaped end face of the second control rack, and a compass is arranged on the right portion of the second control rack. A second spiral groove is formed in the left end of the compass, and any gear tooth of the first straight gear ring is clamped into the second spiral groove. A second straight gear ring is arranged on the periphery of the compass and engaged with a gear which is connected with a motor. According to the braking spiral paint spraying equipment, the spiral radius of the spiral grooves is controlled to control the rotating angle of the second control rack so that the travel path of the spray gun in the first spiral groove can be effectively changed, and the effect of braking in the spraying process is realized.

The invention discloses an automobile braking device which comprises a rotary shaft, rollers arranged at the two ends of the rotary shaft and two braking mechanisms arranged near the two rollers, wherein the braking mechanisms comprise support frames fixedly connected on an automobile chassis, two hydraulic cylinders arranged on the support frames and two arresters fixedly connected to the end parts of telescopic rods of the hydraulic cylinders in a one-to-one correspondence manner; the telescopic rods of the two hydraulic cylinders are oppositely arranged, so that when the telescopic rods relatively move, the two arresters can brake the rotary shaft. According to the automobile braking device, a braking effect can be timely achieved in an urgent state, and traffic accidents are effectively prevented.

The invention discloses a hydraulic brake. A brake body of the hydraulic brake is guided and assembled on a vertically-extending frame body along the clamping direction, and a passive friction plate is fixed on a brake wall on one side of a brake space; an active friction plate is in transmission connection with a driving oil cylinder mounted in a side wall on the other side of the brake space; when the brake starts, the active friction plate is pressed on one side of a brake disc by the driving oil cylinder; at the moment, the brake disc applies counter-acting force onto the brake body, and the whole brake body is pushed by the counter-acting force to move on the frame body, so that the passive friction plate is matched with the other side of the brake disc; and along with continuous increasing of the pressing force of the driving oil cylinder applied onto the active friction plate, the active friction plate and the passive friction plate can be clamped on the two sides of the brake disc to achieve a brake effect. Therefore, in the installation process of the hydraulic brake, the corresponding brake purpose can be realized only through ensuring enough interval between the brake wall and the brake disc, so that the installation difficulty of the brake is reduced, and the installation cost is reduced.

The invention belongs to the technical field of automotive brakes, in particular to an adjustable braking mechanism based on a spiral piece. The adjustable braking mechanism comprises a tire, the spiral brake piece, a main brake piece and auxiliary brake pieces; when an automobile is in the running process and needs to brake, a brake rotating shaft is controlled to rotate, an inner shaft is drivento rotate by rotating of the brake rotating shaft, an inner disc is driven to rotate by rotating of the inner shaft, and the spiral brake piece is driven to rotate by rotating of the inner disc. According to the adjustable braking mechanism based on the spiral piece, the spiral brake piece is matched with the main brake piece and the two auxiliary brake pieces in a friction mode so that the buffering effect on rotating of a driving shaft can be achieved by rotating of the spiral brake piece and friction generated between the rotating main brake piece and the two auxiliary brake pieces, and the brake effect is achieved accordingly; meanwhile, in the rotating process of the brake rotating shaft, a thread ring is driven to rotate by rotating of the brake rotating shaft, and friction force between the spiral brake piece and the auxiliary brake pieces mounted on the driving shaft is increased due to rotating of the thread ring; and the buffering effect of the spiral brake piece on the driving shaft is enhanced, and the brake effect of the braking mechanism is enhanced accordingly.

The invention relates to an emergency braking system of a light rail transportation vehicle, comprising an emergency brake wheel, an emergency brake arm, a hydraulic system and an emergency brake control system, wherein the center of the emergency brake wheel is provided with an axle, one end of the emergency brake arm is connected to the vehicle body through a rotating shaft, the other end of the emergency brake arm is connected to the axle; the hydraulic system is the power mechanism of the emergency braking system, and comprises a hydraulic cylinder and a hydraulic pump, wherein one end of the hydraulic cylinder is connected to the vehicle body, the other end is connected between the midpoint of the emergency brake arm and the midpoint of the emergency brake arm and the axle through a hydraulic cylinder shaft; and the emergency brake control system can control the hydraulic pump to drive the hydraulic cylinder to move downwards, thus the emergency brake arm further drives the emergency brake wheel to move downwards to the surface of a vehicle rail, and frictional force is generated between the emergency brake wheel and a travelling rail to emergently brake the vehicle. The system of the invention shortens the brake distance of the vehicle, improves the safety performance of vehicle travelling, and has simple, convenient and flexible scheme and stronger practicability.

The invention belongs to the field of automobile braking energy recycling, and particularly relates to a braking power generating mechanism based on air compression. The braking power generating mechanism comprises a brake disc, brake disc protrusions, a brake mechanism support, a brake energy mechanical conversion mechanism, brake plate supports, hydraulic columns, a power generator, an air motor, compression cylinders, an air tank and pistons. The brake plate supports are arranged on the brake mechanism support. When the brake disc rotates, in the initial stage of the brake process, brake plates are gradually close to the brake disc, an ejector block is in contact matched with the protrusions firstly, the ejector block linearly moves in a reciprocating manner in the direction of a cylinder guide rail, the pistons are driven to reciprocate through cooperation, and accordingly the air motor is driven to drive the power generator to generate power. In the later braking stage, the brake plates start to make contact with the brake disc, larger friction force is generated, and wheels are forcefully braked. By means of cooperation of the ejector block and the protrusions, braking energy is converted into reciprocating movement, the air motor is driven to drive the power generator to generate power accordingly, the brake energy can be effectively utilized, and the energy saving effect of an automobile is improved.

The invention discloses an anti-falling climbing-assisting device. The device comprises a shell, wherein a rotatable winding drum is arranged in the inner space of the shell, a steel rope is wound around the winding drum, the winding drum is driven by a driving motor to rotate so as to enable the steel rope to do lifting motion along with rotation of the winding drum, an inner wheel coaxially connected with the winding drum in a transmission mode is arranged on the winding drum, a rotatable ratchet pawl is installed on the side surface of the inner wheel in the circumferential direction of theinner wheel, a return tension spring is arranged between the inner wheel and the ratchet pawl, an outer wheel which is coaxial with the inner wheel and arranged outside the inner wheel in a sleevingmode is arranged on the shell, and ratchets cooperating with the ratchet pawl for braking are arranged on the inner side surface of the outer wheel, so that the ratchet pawl can extend outwards to abut against the ratchets for braking under the action of centrifugal force generated by rotation of the inner wheel when the rotating speed of the winding drum reaches a set value.

The invention belongs to the technical field of transmission detection and relates to an AMT (Automated Manual Transmission) offline detection platform and a control method thereof. The AMT offline detection platform includes a computer, a test tool, a control unit, a base, a driving motor which is mounted on the base, and a transmission bracket mounted on the base; the output shaft of the drivingmotor is connected with a coupling used for connecting the output shaft of a transmission to be detected; the control unit is connected with the test tool through a wire harness; the test tool is connected with the computer through a data line; the control unit receives an offline detection request from an operator, and controls each pneumatic actuator to complete offline detection; a rotationalspeed sensor and a position sensor feed back rotational speed signals and position signals which are monitored in real time to the control unit; the control unit transmits relevant status signals andthe like to the computer, so that the computer can display and record the signals in real time; and therefore, the operator can be facilitated to check and judge whether a gear request is completed, whether the gear shift of the transmission is in place, and whether a countershaft brake reaches a braking effect.

The invention discloses a braking universal wheel, comprising a fixed stud. A connection body is fixed to the fixed stud; a roller is rotatably arranged on the connection body; a wear-resisting rubber layer is arranged on the surface of the roller; a pedal is movably arranged on the connection body; a brake block is arranged at the lower part of the pedal and positioned above the wear-resisting rubber layer; antiskid threads are arranged on the surface of the wear-resisting rubber layer; the brake block is made of a wear-resisting rubber block. According to the invention, as the wear-resisting rubber layer is arranged on the periphery of the roller, the brake block is arranged and is in contact with the wear-resisting rubber layer, the brake block is controlled by the pedal arranged on the universal wheel, a braking effect is achieved by using bigger friction force between rubber and rubber, and thus the braking effect of the universal wheel is greatly improved.

The invention discloses a brake assembly of a tractor. The brake assembly of the tractor comprises a bottom plate, a brake cylinder, a left brake shoe, a right brake shoe, a brake drum, a left friction plate, a right friction plate, a gap adjustor assembly and a parking brake assembly, wherein the bottom plate is mounted in the middle of the brake drum; the brake cylinder, the left brake shoe and the right brake shoe are mounted on the bottom plate; the left brake shoe and the right brake shoe are respectively arranged at the left side and the right side of the brake cylinder; the brake cylinder is mounted between the upper end of the left brake shoe and the upper end of the right brake shoe; the gap adjustor assembly is mounted between the lower end of the left brake shoe and the lower end of the right brake shoe; the left friction plate is positioned between the left brake shoe and the brake shoe; the right friction plate is arranged between the right brake shoe and the brake drum; the parking brake assembly is mounted on the bottom plate and is connected with the left brake shoe and the right brake shoe. The brake assembly of the tractor has the beneficial effects that the automatic gap adjusting is flexible and reliable; hand pulling force on a handle can be reduced; the stability and comfort of the whole vehicle during braking can be improved.

The invention discloses a piston braking system and a braking method thereof. The piston braking system comprises transmission rotating shafts located between a starting component and a working component, pistons, and a pressure adjusting mechanism, wherein each piston is connected with the corresponding transmission rotating shaft; when each transmission rotating shaft rotates, the correspondingpiston is driven to be in straight reciprocating motion in a cylinder jacket; a pressure adjusting cavity is formed between each piston and the cylinder jacket; the pressure adjusting mechanism is used for adjusting the pressure in the pressure adjusting cavities, and comprises an inlet pipe and a discharging pipe, wherein the inlet pipe and the discharging pipe separately communicate with the pressure adjusting cavities; one-way valves are respectively arranged in the inlet pipe and the discharging pipe; and an adjusting valve is also arranged in the discharging pipe. Every time the transmission rotating shafts rotate for a circle, the pistons are driven to make a complete reciprocating motion, and in the process, the volume of each of the pressure adjusting cavities is enlarged and reduced. Through the adoption of the piston braking system disclosed by the invention, the problem that a conventional braking manner adopts a manner that kinetic energy is transformed into internal energythrough friction, so that the condition that wear of brake cannot be thoroughly and radically solved to cause invalid slipping is solved, and the purposes of breaking the shackles in the prior art and stopping braking failure caused by damage of friction are realized.

The invention provides a detachable drum body for a regenerated cellulose film paper rolling machine and the paper rolling machine with the detachable drum body. The detachable drum body comprises a transmission shaft. Three cylindrical supporting plates are welded to the transmission shaft, each cylindrical supporting plate is vertical to the transmission shaft, four sliding mounting grooves areevenly distributed in the side wall of each cylindrical supporting plate, a batten is mounted in every three horizontally-arranged sliding mounting grooves jointly, an adjusting device is arranged between each cylindrical supporting plate and the corresponding batten, shaft heads are welded to the two ends of the transmission shaft correspondingly, a mounted aligning bearing is mounted on each shaft head, an air expanding shaft, the detachable drum body and a transmission controller are arranged on a main support side by side, and the air expanding shaft is parallel to the detachable drum body. The detachable drum body for the regenerated cellulose film paper rolling machine has the beneficial effects that the external diameter of the drum body can be freely adjusted, the drum body is detachable, low in production cost and high in production efficiency, films cannot wrinkle, and the operation is easy.

The invention relates to a drive device of an electric parking system, which includes a brake structure and a transmission device; the brake structure includes a shell as well as a worm component and a wire-rewinding component arranged inside the shell; the wire-rewinding component includes a turbine and a wire-holding wheel set; the transmission device is fixedly connected with the worm component; when a user starts the transmission device by a parking-braking control button arranged inside the vehicle for driving the wire-holding wheel set, a braking wire fixed in the wire-holding wheel set is pulled for achieving the brake effect.

The embodiment of the invention discloses a method for recycling electric energy of an electric automobile and the electric automobile. The method comprises the following steps of: when detecting a first operation for the electric automobile, acquiring a first parameter; judging whether the first parameter is greater than a first set threshold value, and generating a first judgment result; when the first judgment result indicates that the first parameter is greater than the first set threshold value, determining a second parameter based on the first parameter; generating a first command according to the second parameter; executing the first command, controlling a motor of the electric automobile to be in a first work mode, and charging a storage battery of the electric automobile.

The invention provides a wind driven generator braking circuit and method adopting latching relays. The circuit comprises a three-phase rectification module, driving power supplies and the latching relays, wherein the three-phase rectification module is used for converting three-phase AC voltage output by a wind driven generator into DC voltage, positive and negative poles of the DC voltage are connected with positive and negative inputs of the driving power supplies respectively, outputs of the driving power supplies are connected with coils of the latching relays, and the latching relays are used for accessing the three-phase AC voltage output by the wind driven generator or the DC voltage output by the three-phase rectification module. Three-phase AC electric energy output by the wind driven generator or DC electric energy output by the three-phase rectification module is short-circuited through closing of contacts of the latching relays, so that the energy output by the wind driven generator is converted into heat energy, and the wind driven generator braking effect is realized; when the wind driven generator is braked, the output voltage of the wind driven generator is substantially reduced, the driving power supplies stop working, and the latching relays perform wind driven generator braking protection continuously under the condition that the coils are powered off.

The invention belongs to the technical field of safety auxiliary equipment, and particularly relates to a safety clamp and a cargo carrying platform. The safety clamp comprises a clamp seat plate, wherein the clamp seat plate is provided with a trapezoidal guide groove; two brake wheels rolling along the bevel edge of the guide groove are arranged in the guide groove; a guiding rod is vertically arranged on the clamp seat plate; a sliding plate moving along the guiding rod top and down is also arranged on the clamp seat plate; two ends of the sliding plate are movably connected with the two brake wheels; and an elastic member for pushing the sliding plate toward the narrow end of the guide groove is arranged on the guiding rod. Through the arrangement of the safety clamp on the cargo carrying platform, the sliding plate is guided by the elastic member to move toward the narrow end of the guide groove when the descending of the cargo carrying platform is too fast or the breaking of a hauling cable starts the safety clamp, and then constrained by the guide groove, the two brake wheels move close to each other for holding guide sliding rails under the action of the inclined surface ofthe guide groove for achieving the effect of braking so that the safety of the cargo carrying platform can be improved.

The invention discloses a speed limiter with a car slipping preventive device. The speed limiter is characterized in that two ends of a spindle are connected with a support frame, a swing rod device is connected onto the support frame by swing shafts and comprises an upper swing rod and a lower swing rod, a rope pulley device sleeves the spindle, the upper swing rod is positioned above the rope pulley device, the lower swing rod is positioned below the rope pulley device and is symmetrical with the upper swing rod, actuating struts are arranged in the middle of the upper swing rod and the middle of the lower swing rod respectively, and the upper swing rod and the lower swing rod are connected with the support frame by the swing shafts. The speed limiter has the advantages that when a car of an elevator slips and the slipping distance of the car is farther than a distance set by a travel switch, the elevator can be braked; when the speed of the elevator is higher than a speed set by the speed limiter, the speed limiter can be mechanically actuated, and then safe pliers or a rope gripper can be driven to be actuated, so that the elevator can stop and is high in safety and reliability.

The invention discloses a clutch manipulation cylinder of an engineering mechanical braking system. The clutch manipulation cylinder is provided with a hydraulic cylinder which comprises a hydraulic cylinder body, a hydraulic piston assembly, an oil inlet connector and a hydraulic cylinder oil outlet; the clutch manipulation cylinder is also provided with air cylinders, wherein each air cylinder comprises an air cylinder body assembly, an air cylinder push rod, an air inlet, an air cylinder piston assembly and a spring holder assembly; the air cylinders are connected coaxially through an air cylinder oil cylinder connection bolt and an air cylinder oil cylinder connection nut; and each spring holder assembly and each hydraulic piston assembly are in contact axially. By adopting the technical scheme, under the condition that a pedal mechanism is not used or the pedal mechanism has a fault, a booster air inlet valve of the clutch is opened through inputting working air pressure to the air inlet, and the separation of the clutch manipulation mechanism also can be realized so as to reach the braking effect; and the braking process is simple to operate, performances are stable, friction plates can be separated by the air pressure braking in a short time, and also can return to the original position in a short time, the braking efficiency is high, thus the service life of the product is prolonged greatly.

The invention provides a vertical axis wind turbine brake device, wherein one end of a rotary shaft of a spoiler is connected with a support of a vertical axis wind turbine, the other end of the rotary shaft of the spoiler is articulated with the spoiler, and the profile shape of the spoiler is a symmetrical wing shape; when wind force is smaller, the spoiler can be used for rotating around the rotary shaft of the spoiler until the profile axial line is parallel to the horizontal plane without influencing the normal operation of the vertical axis wind turbine; and when the wind force is greater, the spoiler can be used for rotating until the profile axial line is vertical to the horizontal plane, the frontal area is increased, and greater resistance is generated, thus the vertical axis wind turbine slows down. The brake effect can be achieved without the mutual effect of machinery, the vertical axis wind turbine is ensured to brake safely, and the service life of the brake device is prolonged.

The invention discloses a spindle clearance eliminating structure of a direct-drive torque motor device, comprising main elements of a body, a direct-drive torque motor, a spindle, a bearing assembly and an adjusting nut; and a plurality of layers of the spindle are utilized to locate the torque motor and the bearing assembly, then the torque motor and the bearing assembly locate the body, an auxiliary roller bearing is arranged in the bearing assembly, and the auxiliary roller bearing butts against the middle part of the body and the spindle, additionally, a screw thread is made on the tail end of the spindle, and the adjusting nut is fed to lock and locate all elements on the spindle. The structure can be applied on assembling direct-drive torque motor devices, and can simplify the assembly work and improve the reliability, as well as eliminating the spindle clearance and improving the product life.

The invention provides a magnetic braking device, which comprises a belt roller and a braking roller, wherein the rolled edge of the braking roller is provided with a right-angle type braking block, the roller shaft of the braking roller is installed on a supporting block, the lower rod body of the supporting block is inserted into a sliding chute of an electromagnetic brake, the electromagnetic brake drives an electromagnetic braking spring, the electromagnetic braking spring is sleeved outside the lower rod body of the supporting block, and the top end of the electromagnetic braking spring is supported on the braking block. The magnetic braking device provided by the invention has the beneficial effects that the electromagnetic braking spring is driven by the electromagnetic brake, and the braking roller is ejected by the supporting block; when the braking roller and the belt roller rotate simultaneously, the right-angle type braking block of the braking roller is contacted with the belt roller, thus the friction force is increased and the braking effect is achieved; and after the electromagnetic braking spring shrinks, the braking roller falls to the sliding chute of the electromagnetic brake along with the electromagnetic braking spring under the action of self gravity.

The invention discloses a mechanical torque limiter which comprises a driving shaft. A flange plate is arranged on one side of the driving shaft; braking rings, balls and locking gears are arranged onthe side face of the flange plate; the locking gears are evenly distributed on the side face of the flange plate; friction plates are arranged on one side of the flange plate, and confinement rings are arranged on the side faces of the friction plates; braking pieces are arranged at the two ends of the confinement rings; the locking gears are arranged in a triangular mode, and meanwhile the locking gears are tightly welded to the side face of the flange plate; limiting pieces are arranged at the two ends of the braking rings and formed by stainless steel alloys which are machined, and a texture is arranged at one end of each limiting piece; and meanwhile, the limiting pieces are fixedly connected with the braking rings, and the limiting pieces are arranged at the two ends of the braking rings correspondingly. When a device is braked, the limiting pieces at the two ends are inwards buckled tightly simultaneously, and through friction with the locking gears, the device is stopped in a forced mode.

The invention discloses a labor-saving brake handle device. The labor-saving brake handle device comprises a gripping handle (1), a brake handle (3) and a connecting piece (2), the connecting piece (2) is composed of a first connecting piece (2.1) and a second connecting piece (2.2), one end of the first connecting piece (2.2) sleeves the gripping handle (1), the other end of the first connecting piece (2.2) is bent downward by a certain angle to form the second connecting piece (2.2), at least one vertical support plate is arranged at one end of the brake handle (3), the end of the support plate is hinged to the joint of the first connecting piece (2.1) and the second connecting piece (2.2), and a mounting part matched with a brake cable device is arranged at each of the lower end of the bent piece (2.1) and one end of the brake handle (3). The labor-saving brake handle device is compact in structure, uniform in brake handle gripping force, safe, reliable and more labor saving.

The invention discloses an improved structure of a brake apparatus of an electric vehicle. The improved structure comprises a vehicle frame and a support leg of the electric vehicle. The support leg of the electric vehicle is hinged onto the vehicle frame, a brake wheel is hinged onto the support leg of the electric vehicle, brake calipers which can clamp the brake wheel are arranged on the support leg of the electric vehicle, a brake pedal is arranged at a footrest position of the vehicle frame, a pedal connecting rod is connected to the lower end of the brake pedal, and a transmission mechanism is arranged between the pedal connecting rod and the brake wheel. The improved structure has the advantages that the pedal connecting rod drives the support leg of the electric vehicle via the transmission mechanism, so that the support leg of the electric vehicle can downwardly swing until the brake wheel is landed, at the moment, the transmission mechanism continues applying tensile force to the brake calipers, the calipers clamp the brake wheel, and the purpose of braking the electric vehicle is achieved; a foot braking mode is added for a driver owing to the structure, the problem that the driver needs to step on the ground to brake the electric vehicle at ordinary times is solved, and potential safety hazards are reduced.

A hydraulic disk brake includes a slide carriage and a body. The slide carriage cooperating with a restoring spring is attached to the body, and the body is provided with a control valve assembly. The body is provided with a groove for transferring oil. The brake disc is braked by a braking assembly by means of increasing the oil pressure in the groove. When braking, the slide carriage moves back and forth on an arc path with respect to the body by means of the control valve assembly, and the brake disc is clamped and released repeatedly, which make it possible for the braking action of the present invention to prevent the hydraulic disc brake of the vehicle from locking the brake disc, and to eliminate the troubles of unsteadily driving and skidding which take place in hard braking.