491results about How to "Reduce impact noise" patented technology

A tensioner that includes a piston supported slidably in a piston bore formed in a housing, a piston spring biasing the piston in the protruding direction, and a circlip member having an expandable ring-shaped body that is engageable with the rack teeth of the piston. In the piston bore, the ring-shaped body of the circlip member is adapted to engage with an upper and lower stop surface. The rack teeth of the piston are formed in such a shape that when the ring-shaped body of the circlip member engages with the upper stop surface of the piston bore, the piston is permitted to move in the protruding direction and, when the ring-shaped body of the circlip member engages with the lower stop surface of the piston bore, the piston restricts movement in the retracting direction.

During the low load operation, this fuel injection control device reduces the initial armature displacement speed of the solenoid actuator that drives the open-close valve against the low fuel pressure in the balance chamber, thereby lowering impact noise produced in the solenoid portions. When the engine is determined to be idling, a command pulse width which energizes the solenoids of the solenoid actuator is calculated according to the target injection amount, the common rail pressure, and the target fuel injection timing. Since the initial period of the command pulse width, i.e., pull-in current conduction period, is set shorter than the pull-in current conduction period for the high load operation of the engine, the initial armature displacement speed of the solenoid becomes relatively slow reducing the impact noise of the armature abutting against the stopper.

A tensioner that includes a piston supported slidably in a piston bore formed in a housing, a piston spring biasing the piston in the protruding direction, and a circlip member having an expandable ring-shaped body that is engageable with the rack teeth of the piston. In the piston bore, the ring-shaped body of the circlip member is adapted to engage with an upper and lower stop surface. The rack teeth of the piston are formed in such a shape that when the ring-shaped body of the circlip member engages with the upper stop surface of the piston bore, the piston is permitted to move in the protruding direction and, when the ring-shaped body of the circlip member engages with the lower stop surface of the piston bore, the piston restricts movement in the retracting direction.

In an electromagnetically controlled inlet valve actuator provided to a high pressure fuel pump, an impinging sound which is generated at the time of operating the mechanism is reduced. In a high pressure fuel pump provided with an electromagnetically controlled inlet valve (operated by way of a plunger rod), a current supply period includes a 1st current supply period for performing an operation of attracting the plunger rod in a valve closing direction, a 2nd current supply period for alleviating a speed at which the plunger rod moves in a valve opening direction, and a limited current supply period disposed between the 1st current supply period and the 2nd current supply period in the form of spanning a pump top dead center.

A method and system for operating a motor vehicle brake system, including several wheel brakes, an electrically controllable pressure supply device, dispenses a pressure medium volume for actuating the brakes, and an analogized or analog-controlled inlet valve, arranged in each wheel brake between the pressure supply device and wheel brake, for adjusting wheel-individual brake pressures. A check valve is connected in parallel to each inlet valve. At the start of a wheel-individual brake pressure control, all inlet valves are closed, and a pressure build-up is carried out in a predetermined group of one or more wheel brakes by displacing a pressure medium volume into the predetermined group of wheel brakes by the pressure supply device. Each inlet valve of the predetermined group is controlled such that the inlet valve is overflowed, wherein each inlet valve of the remaining wheel brakes is controlled such that the inlet valve remains closed.

The invention relates to the technical field of new energy automobiles, in particular to a control method for switching working points of a range extender. The control method includes the following steps that 1, the target power P target of the range extender is obtained; 2, the target rotation speed ntarget and the target torque Ttarget of the range extender are obtained; 3, the rotation difference value delta n of the range extender is calculated; 4, in a range extender controller, whether the absolute value of the rotation speed difference value delta n of the range extender is smaller than the set rotation speed ndiff of working point switching or not is judged, and if yes, the working point switching process of the range extender enters a small working point switching mode; if not, the working point switching process of the range extender enters a large working point switching mode. According to the control method for switching working points of the range extender, in the working point switching process of the range extender, a system make a response rapidly, rotation speed excessive adjusting can be reduced, torque impact and work noise are lowered, the service life of the range extender is prolonged, and it is guaranteed that the range extender is simple in structure.

The vibration damper including a hydraulic end stop that has a sealing ring which is arranged between the end stop ring and the closure element, is supported axially on one side at the end stop ring, engages radially around the piston rod, is mounted in a sliding manner at the piston rod, and with its outer circumferential surface radially contacts the inner wall of the control space, wherein the sealing ring has at least one radial throttle groove which takes effect when the end stop with the sealing ring moves into the control space and ensures a defined flow of damping medium between the control chamber and the first working space, and wherein the sealing ring has a plurality of spring tongues which are supported at a supporting surface on the piston rod side.

In a sprocket comprising a sprocket hub, sprocket teeth and a cushion plate for contacting link plates of a transmission chain, the cushion plate is formed with concave portions at angular positions corresponding to the angular positions of the tips of the sprocket teeth, thereby avoiding contact, or reducing contact pressure, between the cushion plate and the middle parts of link plates of the chain.

The invention provides a rotation speed reducing structure of dust collection chamber cap of vacuum cleaner, characterized by that the arrangement comprises a dust collection chamber cover and a speed reduction projection, wherein the dust collection chamber cover is arranged on one side of the bottom casing of the body member for opening and closing the dust collection chamber, the speed reduction projection can slow down the rotational speed of the dust collection chamber cover.

The invention relates to a method for operating a brake system for motor vehicles, comprising several wheel brakes (8, 9, 10, 11), an electrically controllable pressure supply device (5, 100), which can dispense a determinable pressure medium volume (V) for actuating the wheel brakes, and an analogized or analog-controlled inlet valve (6a-6d), which is arranged in each wheel brake between the pressure supply device and the wheel brake, for adjusting wheel-individual brake pressures (pn). A check valve (50a-50d) is connected in each case in parallel to the inlet valves, which opens in the direction of the pressure supply device, wherein, at the start of a wheel-individual brake pressure control, all the inlet valves (6a-6d) are closed, and wherein a pressure build-up is carried out in a predetermined group (A1, A2) of one or more wheel brakes (8, 11, 8, 11) by displacing a pressure medium volume (VA) into the predetermined group (A1, A2) of wheel brakes by means of the pressure supply device (5, 100). Each inlet valve of the one or more wheel brakes (8, 11, 8, 11) of the predetermined group (A1, A2) is controlled in such a way that the inlet valve is overflowed, wherein each inlet valve of the remaining wheel brakes (9, 10, 11, 8, 9, 10, 9, 10) is controlled in such a way that the inlet valve remains closed. The invention also relates to a brake system.

A motor vehicle door lock with latching elements, such as a latch and a ratchet and with a lock mechanism. The lock mechanism has a drive, the drive having a drive motor, or the like, and an actuating element. The ratchet can be raised by the drive, so that the ratchet moves into an action area of the drive, such that continued motion of the drive is blocked by the ratchet. Thus, the drive can be turned off in a blocking operation. The ratchet, viewed in the kinematic chain from the drive motor to the actuating element, is engaged to the drive for blocking in front of the actuating element but not on the actuating element.

The invention discloses a car window motor control circuit and method. When an MCU obtains that a vehicle window does not run to the position near the full-opening or full-closed position through a position sensor, the MCU is used for controlling the average voltage at the two ends of an car window motor to not change, so that the car window motor is kept at a set relatively high speed; when the MCU obtains the car window through the position sensor and reaches the full-opening or full-closed position, the MCU controls the average voltage at the two ends of the car window motor, so that the running speed of the car window motor is reduced, and the MCU controls the car window motor to run at a set relatively slow speed until the full-opening or full-closed position is completely closed andis blocked; and the MCU controls the car window motor to stop running when the MCU obtains a full-open or full-closed position through the position sensor. According to the car window motor control circuit and method, the impact sound of the car window glass and a car body metal plate is reduced when the car window glass runs to a fully-opened or fully-closed position, and the current is reduced when the car window glass runs to the full-opening or full-closed position.

A pneumatic tire in which a sipe, which is substantially parallel to a contour line of a trailing edge of a ground-contact configuration, is formed in a trailing edge region of each block at shoulder sides of the pneumatic tire. From a time of step-in to a time of kick-out of a block, the effect of shearing strain which is transmitted to a trailing edge from a preceding trailing edge portion is mitigated, and movement of the trailing edge of the block with respect to a road surface is suppressed. Accordingly, wear at the trailing edge of the block, i.e., heel-and-toe wear, is suppressed, and noise caused by heel-and-toe wear is reduced.

A hydraulic breaker assembly including a head cap, a cylinder, and a front head, which arc mounted in a casing, wherein corresponding faces of the front head and the cylinder are connected by connecting pins, wherein the cylinder and the head cap located above the cylinder are fixed together by fastening bolts, and wherein the front head, the cylinder, and the head cap are supported on an inner side of the casing by variable dampers, which are brought into close contact with the front head, the cylinder, and the head cap. The movement in the casing is thus prevented so that the head cap, the cylinder, and the front head are strongly coupled together. The length of the fastening bolt is reduced to minimize the impact-generating section so that the bolt is protected from distortion stress occurring upon striking of the rod, thereby increasing durability.

The invention relates to a linearly-reciprocating piston compressor, belonging to the filed of the compressor. The linearly-reciprocating piston compressor comprises a crank pin, a connecting rod, twopistons and two air cylinders; the two pistons and the two air cylinders are distributed oppositely; the two pistons are arranged in the air cylinders and are matched with the air cylinders in a sliding way; two ends of the connecting rod are respectively connected with the two pistons; the middle part of the connecting rod is provided with two parallel guide rails and an auxiliary connecting rod; the ends of the auxiliary connecting rod are provided with shaft pins; rollers are rotationally sleeved on the shaft pins; and the rollers are matched with the guide rails in a rolling contact way.One of the two guide rails is used for driving one piston to carry out compression stroke, the other guide rail is used for driving the other piston to carry out air inlet stroke, and the two guide rails work alternatively, thus the match clearance between the rollers and the guide rails can be effectively reduced or fully eliminated, the rollers are kept contacting the guide rails in a rolling way, the friction between the rollers and the guide rails is mitigated, and the noise from the impact of the rollers and the guide rails is reduced. The linearly-reciprocating piston compressor can be used for producing the compressor, the vacuum pump, the hydraulic pump and the water pump.

A noise decreasing type electromagnetic switch includes a buffer disposed between an end of a stationary core and an end of a movable core facing the end of the stationary core so as to allow the movable core 150 to be elastically supported with respect to the stationary core. Accordingly, when the movable core contacts the stationary core, the buffer can be pressed and transformed to decrease impact and noise. Also, when the final operation is completed, the stationary core and the movable core are closely adhered, a performance of an actuator can be maintained.

The invention discloses a slow descent pipeline, and belongs to the technical field of conveying devices. The slow descent pipeline aims to solve the problem that material will impact the lower side of a vertical section and the lower side of an inclined section when falling off to cause abrasion of a pipe fitting. The slow descent pipeline comprises the vertical section and the inclined section which is connected to the lower portion of the vertical section, a plurality of inclined baffles are arranged in the vertical section in the longitudinal direction, and every two inclined baffles penetrate through each other. According to the slow descent pipeline, the inclined baffles are arranged in a staggered mode to form a zigzag curve flowing channel. When the slow descent pipeline works, the material enters the vertical section from the upper portion, makes contact with the inclined baffle on the upper portion, reverses, descends step by step after being buffered, and is conveyed to other areas from the inclined section. Compared with the prior art, the inclined baffles of the slow descent pipeline have a slow descent effect on material flow, abrasion to the pipe fitting from the fallen material can be effectively slowed down, service live of the pipeline is prolonged, and meanwhile impact noise can also be reduced.

The present invention relates to a flooring material including a PLA surface layer having a wood pattern. The flooring material includes a surface layer including at least one layer containing a PLA resin, a plywood layer including a veneer disposed on the undersurface of the surface layer, and a synthetic resin layer disposed on the undersurface of the plywood layer. The flooring material is cut in a tongue & groove shape.

The invention discloses a multi-split system and a switching control method of an operating mode of indoor units thereof. The switching control method comprises the following steps that when any of the multiple indoor units receives a mode switching instruction, the indoor unit sends the mode switching instruction to a flow dividing device; and the flow dividing device conducts switching control over a heating control valve or a refrigerating control valve corresponding to the indoor unit according to the received mode switching instruction, releases pressure by controlling a second throttling assembly, a first control valve and a bypass valve so as to decrease the front-back pressure difference of the refrigerating control valve or the heating control valve corresponding to the indoor unit, obtains the switching flag bit of a four-way valve, and controls the refrigerating control valve or the heating control valve and the four-way valve corresponding to the indoor unit according to the switching flag bit of the four-way valve, hidden pipeline cracking dangers caused by impact of coolants are better avoided accordingly, corresponding coolant impact noise is reduced, and the reliability of the system and the noise quality are improved.

An assist handle apparatus for a vehicle having a mounting plate positioned at a handgrip may include a damping mechanism having a hinge pin connected to the handgrip; hinge ends positioned at first and second sides of the mounting plate, wherein a damper seat is formed in a space defined between the hinge ends; a damper that is inserted in the damper seat with the hinge pin passing through the damper and the hinge ends, the damper having first and second damping ends protruding at a first side and a second side of an outer circumference of the damper respectively; and a stopper that is formed on an inner side of a hinge portion of the handgrip, wherein the stopper damps rotation shock in both rotation directions of the handgrip when the stopper selectively contacts with the first damping end or the second damping end according to rotation of the handgrip.

A pneumatic tire including at least four circumferential main grooves extending in the tire circumferential direction and a plurality of rib-like land portions partitioned by the circumferential main grooves in the tread portion. An outer side second land portion includes an L-shaped narrow groove formed by connecting a width direction groove portion extending from an edge portion on an outer side in the tire width direction of the outer side second land portion toward an inner side in the tire width direction, and a circumferential direction groove portion extending substantially parallel to the tire circumferential direction and terminating in an interior portion of the outer side second land portion,and a penetrating sipe penetrating the outer side second land portion in the tire width direction and intersecting the circumferential direction groove portion.

The invention discloses an automatic lifting roller blind retarder comprising a retarder main body, an clutch mechanism and a transmission mechanism, wherein one end of the retarder main body is connected with the clutch mechanism; the other end of the clutch mechanism is connected with the transmission mechanism; the other end of the transmission mechanism is connected with a curtain roller and can rotate coaxially along with the curtain roller. When a curtain is rolled, the clutch mechanism ensures that the transmission mechanism is connected with the retarder main body, and thus, the braking force generated by the retarder main body is transmitted to the transmission mechanism and the curtain roller; and when the roller blind is unfolded, the clutch mechanism ensures that the transmission mechanism is disconnected with the retarder main body. The automatic lifting roller blind retarder is simple in structure, reliable in operation and low in manufacturing cost, generates the braking force when the curtain is rolled, further reduces the impact sound when the curtain is rolled, particularly when the rolling is about to end, and does not increase the drawing force when the curtain is unfolded, therefore, the service stability and service life of the curtain are improved.

The invention belongs to the field of general aircrafts, and particularly relates to an electrodynamic multi-rotor helicopter. The electrodynamic multi-rotor helicopter comprises a fuselage, power rotors, a rotor support arm, a undercarriage, an electric supply system and a flight control system, wherein even power rotors are arranged above the fuselage, each power rotor is installed on the upper part of the fuselage through the rotor support arm, the undercarriage is arranged at the lower part of the fuselage, the electric supply system and the flight control system are respectively installed in a battery cabin and a cockpit in the fuselage; the structures of the power rotors are the same, and the power rotor comprises a screw propeller, a drive motor and fairings; the drive motor is installed on the fuselage through the rotor support arm, the screw propeller is connected with the output end of the drive motor, and fairings are respectively arranged at the lower end of the drive motor and the upper end of the drive motor above the screw propeller. The helicopter disclosed by the invention is compact in structure, flexible in movement, and large in lift-weight ratio, and has the advantages of being strong in adaptability, safe and reliable, economical, environment-friendly, simple in control, and low in maintenance charge.

A high pressure fuel pump for use with an internal combustion engine and a method of operation of a high pressure fuel pump are disclosed. The high pressure fuel pump may include a supply chamber and a pump chamber separated by a passage in sealing arrangement with a disk. The disk may have one or more holes therethrough and be rotatable in order to place the holes in the disk in varying degrees of alignment with the passage to allow respective, varying amounts of fuel to flow through the passage.

The invention provides a fully water-lubricated super-pressure plunger water pump, mainly comprising a cavity, a live spindle and a plunger flow-distribution unit; the plunger flow-distribution unit comprises a flat valve assembly and a plunger slipper assembly; the plunger slipper assembly is used for dividing the cavity into a pressure cavity and a lubricating cavity which are independent from each other; the plunger slipper assembly carries out reciprocating motion by the driving of the live spindle so that the flat valve assembly sucks in water and discharges water through a water pump inlet and a water pump outlet, and water is simultaneously conveyed to the lubricating cavity through the water pump inlet so as to provide fluid to the rotating unit for lubricating and realizing full water lubrication. The flat valve assembly is designed integrally, and the assembly can be replaced quickly when maintenance so as to shorten maintenance time; the plunger is a stepped structure, the cylindrical surface thereof is provided with recesses, and the bottom of the slipper is provided with a stepped support cavity, thereby solving the wearing and friction problem of the plunger / plunger sleeve pair and slipper / sloping cam plate pair under high-speed heavy-duty condition, and prolonging the service life of the water pump.

The invention discloses a stacking and pushing device and a mute mahjong machine applied with the stacking and pushing device. The stacking and pushing device comprises a tile bearing seat, a liftingsliding block, a tile pushing head, a tile pushing sliding block and a reciprocating mechanism for driving the lifting sliding block to lift and simultaneously driving the tile pushing sliding block to reciprocate; the tile pushing sliding block is provided with a guide groove, and an elastic buffer structure is arranged in the area, where the corresponding tile pushing head contacts and pushes mahjong tiles, of the guide groove; the tile bearing seat is provided with a tile bearing inclined surface for lowering the falling difference during falling of the mahjong tiles, and the mahjong tilesstacked on the tile bearing seat are further aligned with the tile pushing head and a tile channel pushed by the tile pushing head along with one of the lifting positions of the lifting sliding block.According to the stacking and pushing device in the invention, the impact noise between the mahjong tiles and the tile bearing seat and the impact noise between the mahjong tiles in the tile stackingand pushing process can be effectively controlled, the experience feeling of the automatic mahjong machine is improved without the need of changing the tile stacking and pushing work mode in the existing automatic mahjong machine, and the improvement cost is low.

A fluid-filled type vibration damping device including an elastic movable member attached to a partition member. The elastic movable member includes a clasped portion clasped by the partition member and a switching portion provided to an outer peripheral side of the clasped portion and positioned within a second orifice passage. An abutting portion is provided to the switching portion and projects to lengthwise opposite sides of the orifice passage. A switching mechanism is constituted for opening the orifice passage through a gap formed between the switching portion and the inside face of the orifice passage while closing the orifice passage by abutment of the abutting portion against the inside face of the orifice passage by means of a tilting motion of the switching portion relative to the clasped portion through elastic deformation of a thin portion provided between the clasped portion and the switching portion.