74results about How to "Reduce abnormal noise" patented technology

A reduction-drive device has a first and a second reduction mechanism and distribution device. The first reduction mechanism has a planetary carrier, a planetary gear rotatably supported by the planetary carrier, an internal gear in mesh with the planetary gear and a sun gear. The first reduction mechanism is supported by the housing so as to reduce driving force of the electric motor. The second reduction mechanism is positioned between the electric motor and the first reduction mechanism so as to reduce an output of the first reduction mechanism. The differential device is supported by the housing so as to distribute the output of the second reduction mechanism to a wheel side.

The position of a damper is changed over to switch over the cooling mode between an inside air intake mode and an A/C intake mode. In the inside air intake mode, the air inside a passenger compartment of a motor vehicle is taken in and directly blown to a battery by the operation of a battery blower fan. In the A/C intake mode, the air cooled down by an air conditioner (evaporator) is taken in and blown to the battery by the operation of the battery blower fan. When the detected vehicle speed V is not lower than a preset reference speed Vref, the position of the damper is immediately changed over (steps S240 to S260). When the vehicle speed V is lower than the preset reference speed Vref, on the other hand, the operation amount of the battery blower fan is restricted to a preset limit level Qlim, prior to the changeover of the position of the damper (steps S220 to S260). Such control reduces the potential wind roar occurring in the course of the changeover of the position of the damper, thus effectively preventing the driver and the other passengers from feeling odd and uncomfortable.

The invention relates to a method for removing abnormal noise in single-point reception of seismic record by a digital detector, belonging to seismic data processing. The method comprises the following steps: obtaining a weighted median for a trace adjacent to each frequency sample point relative to an amplitude spectrum; comparing the median and an amplitude value of each frequency sample point, and calculating a weighted value if the amplitude value is more than a threshold value; attenuating a trace where the frequency sample point is located in a frequency space field to obtain a noise frequency spectrum; carrying out inverse transformation on the noise frequency spectrum to obtain time and space field noise; detracting noise from the original record, removing the abnormal value of the frequency field, and changing and calculating residual strong energy interference in an envelope trace attenuation record. The invention effectively attenuates abnormal noise, can effectively remove high-frequency interference and abnormal energy interference in the record and improves the signal-to-noise ratio of the seismic data.

The invention provides a rubber bushing with lubricant and the manufacturing method thereof. After weeks in the stable and high-precision surface are attached to rubber bushing lubricant to be installed in the rod-like components, the lubricant allows stable attachment between the rubber bushing and between the rod-like components. Rubber bushing in a circle on the slit settings of the formation of slit for opening parts of the state of deformation can be rubber bushing with the axis along the direction perpendicular to the rod-like chimera components, including the use of rotary rubber bearing bush Bearing rotary units, and the lubricant nozzle emitting device can be inserted into the hollow of the nozzle and the formation of holes towards the center hole with the hollow axis direction orthogonal opening vents, in the rubber bushing in the rotary table bearing around the central axis of rotation at the same time, since the smoke vents lubricant, thus, the lubricant to the wire spiral and coating adhesion of the rubber bushing within weeks face.

The present invention is used with a stopper mechanism for mechanically stopping the rotation of a motor. A pair of brushes is disposed such that a line which passes through the center of a rotor and connects the centers of the paired brushes is offset by a predetermined angle from a line which connects the centers of paired magnets. A commutator is disposed in such a manner as to be offset from a reference position by the same angle as the predetermined angle by which the paired brushes are offset. The predetermined angle falls within a range between an angle obtained by dividing 70° by the number of pairs of stator poles and an angle obtained by dividing 290° by the number of pairs of stator poles. Specifically, in the case of two stator poles, the predetermined angle falls within a range of 70° to 290° inclusive. In the case of four stator poles, the predetermined angle falls within a range of 35° to 145° inclusive.

The invention discloses a ceiling type ventilation fan. The ceiling type ventilation fan comprises an air ventilating structure. The air ventilating structure comprises a multi-vane impeller, a snail shell, an impeller drive motor and a motor installation frame. The snail shell comprises a shell body, an air inlet and an air outlet. The multi-vane impeller is arranged inside the shell body in the vertical direction. The motor installation frame is arranged above the multi-vane impeller and is separated from the multi-vane impeller. The bottom middle area, away from the direction of the multi-vane impeller, of the shell body protrudes and forms a first concave portion. The air inlet is formed in the bottom of the first concave portion, and the air inlet and the first concave portion form a first annular boss-shaped structure. The lower end of the multi-vane impeller extends into the first annular boss-shaped structure, is opposite to the air inlet, and is further isolated from the inner wall of the first concave portion and the air inlet. Under the conditions that the ventilation fan is communicated with a long outdoor pipeline or the external wind pressure is large, the multi-vane impeller can be prevented from touching the motor installation frame or the snail shell, and when the multi-vane impeller of the same performance is adopted, air reverse flow and abnormal sounds are reduced.

The invention provides a diaphragm type PCV valve which can decrease abnormal sound. The diaphragm type PCV valve comprises a hollow shell and a film in the shell. The shell is provided with an air outlet and an air inlet respectively on the lower part and the lateral part of the film. A big spring is fixed at the air outlet. The top of the big spring is connected with a big spring bracket which is provided with a through hole on the bottom. A supporting block is fixed at the position of the film corresponding to the big spring bracket. A small spring is fixed on the periphery of the supporting block. A small spring bracket is disposed on the bottom of the small spring. The middle part of the small spring protrudes upwards and extends into the small spring. A through hole is arranged on the part of the small spring bracket which is inside of the small spring. With a supporting block and various guiding structures, the PCV valve can fully induct air in a crankcase into an induction system when engine works with a small load and can limit and guide the reciprocating movement of spring to decrease the abnormal sound generated from the diaphragm type PCV valve and prolong the service life of PCV valve.

The invention discloses an equal feeding quantity type automatic worm polishing mechanism. The equal feeding quantity type automatic worm polishing mechanism comprises a workbench (1), a worm polishing device (11) and a worm clamping device (3), wherein the angle defined by the inclined worm clamping device and the worm polishing device corresponds to the tooth-shaped spiral angle of a worm required to be polished; the worm polishing device is mounted on a sliding base (4); the sliding base is connected with a sliding base motor (5). According to the equal feeding quantity type automatic worm polishing mechanism disclosed by the invention, the feeding quantity is controlled by the sliding base motor, the feeding quantity for each time is equal to the previous feeding quantity plus the polishing consumption quantity, so as to meet feeding conformance for each time; the technological method improves the machining precision of the armature spindle worm to a large extent, finally perfects the whole motor quality control, and meanwhile reduces the labor cost. The automatic polishing mechanism can be widely applied to automobile micromotors such as automobile wiper motors, seat motors and windshield lifting motors.

A fitting structure has a power transmission member (323) which includes first and second tooth sections (161, 162) arranged at intervals at the outer peripheral edge of the power transmission member and to which power is transmitted, and the fitting structure also has a fitting member (600) which is placed so as to surround the power transmission member (323), has formed therein first recesses (163) for receiving the first tooth sections (161) and second recesses (164) for receiving the second tooth sections (162), and fits to the power transmission member (323). The distance between the outer surface of a first tooth section (161) and the inner surface of a first recess (163) is set greater than the distance between the outer surface of a second tooth section (162) and the inner surface of a second recess (164), and an elastically deformable cushioning member is provided between the outer surface of the first tooth section (161) and the inner surface of the first recess (163).

An expansion device that reduces abnormal noise due to vibration of a valve body and reduces valve body suction phenomenon caused by high-pressure refrigerant flowing through a variable hole formed between a valve seat and the valve body produced. In the expansion device, the buffer chamber (23) is composed of the following components: cylinder (16), formed in the housing (10) forming the valve seat (14); piston (17), which is formed with the valve body (15) as One piece; the adjusting screw (22), when the valve body is subjected to the sudden pressure change of the introduced refrigerant, absorbs the violent action of the valve body through the volume change of the buffer chamber, thereby suppressing the vibration of the valve body (15), thereby reducing Unusual noise generation. Make the ratio (b/a) of the valve body diameter (b) of the valve body (15) to the valve port diameter (a) of the valve hole less than or equal to 1.5, so as to reduce the suction phenomenon of the valve body, and make the refrigerant flow with the primary pressure and The pressure difference between the secondary pressures corresponds to the flow through.

The embodiment of the invention provides an electromagnetic loudspeaker and a mobile terminal. The electromagnetic loudspeaker comprises a bracket (1), a diaphragm (2), a coil (3), a magnetic bowl (4), a magnet (5) and two vibration balance diaphragms (8). The magnet (5) is arranged in the groove (6) of the magnetic bowl (4). A gap (7) is formed between the magnet (5) and the sidewall of the magnetic bowl (4). The coil (3) is arranged on one side of the diaphragm (2) that faces the magnetic bowl (4) and extends into the gap (7) through the diaphragm (2). The vibration balance diaphragms (8) are arranged on the magnet (5) or the coil (3). Each vibration balance diaphragm (8) comprises a connecting part (9) and an empennage (10). The two vibration balance diaphragms (8) are oppositely arranged, and the spacing between the two empennages (10) is gradually increased along the direction away from the magnet (5) or the coil (3). According to the embodiments of the invention, the left traction force and the right traction force of the coil can be increased. Therefore, the coil is ensured to move in a preset direction. Meanwhile, the abnormal sound is reduced, and the tone quality is improved.

The invention provides a volute tongue, a cross-flow fan and an air conditioner. The volute tongue comprises a volute tongue body, wherein the volute tongue body is provided with a windward flow-dividing surface, a tongue part inner flow surface and a flow guide channel, wherein the flow guide channel extends from the windward flow-dividing surface to the tongue part inner flow surface so as to guide the air flow at the windward flow-dividing surface to the tongue part inner flow surface. According to the volute tongue, the cross-flow fan and the air conditioner, the abnormal noise of the cross-flow fan can be remarkably reduced, and the comfort of the cross-flow fan and the air conditioner is improved.

A brake drum which can improve the drag strength, strength and rigidity in the diametrical direction, joint strength, and heat radiating ability, that is, a brake drum which is used for a drum brake, wherein the drum has a plurality of the projections at the outer circumferential surface, the plurality of the projections are formed at the outer circumferential surface as a whole when casting a brake drum, and at least part of the projections have thin-waisted shapes. A height of the projections is 0.3 to 5.0 mm, while the number of projections is 5 to 100/cm². The brake drum is produced by centrifugal casting.

The present invention is indoor assembly structure for one window type air conditioner with height/width ratio greater than 1. The space inside casing of the air conditioner is divided into indoor part and outdoor part with hollow track with air flow space and exhaust track combined to the upper end of the hollow track. The exhaust track is assembled to the hollow track via inserted slot and assembling rib in the hollow track and the inserting lug and inserted slot in the exhaust track. The exhaust track is also provided with setting guide, support rib and combining rib for installing the controller between the exhaust track and the casing, and has exhaust flow channel communicated with the through hole in the front panel of the air conditioner.

The invention discloses a skipping type automatic conveying device for armature shafts. The skipping type automatic conveying device comprises a material box (10) and a feeding support (3). The material box is connected with fixed steps (7), a feeding power source (2) is arranged on the feeding support (3) and connected with a feeding pushing plate (5), movable steps (6) are arranged at the positions, corresponding to the fixed steps, of the feeding pushing plate, and a pushing block (9) is arranged at the top end of the fixed steps through a material positioning plate (8) and connected with a pushing power source (1). The feeding support is arranged on a feed sliding table, and the feed sliding table is connected with a sliding table power source. By means of the skipping type automatic conveying device, the armature shaft at the lowermost stage can be conveyed upwards step by step in a one-stage skipping mode along the fixed steps to arrive at the material positioning plate finally and then is automatically conveyed out through the pushing block, labor cost is reduced, the machining precision of a worm part of the armature shaft can be improved for an armature shaft polishing device, and abnormal sounds generated when a motor works can be reduced.

A speaker includes a frame, a magnetic circuit secured to the frame, a voice coil, a damper, and a diaphragm. The voice coil is inserted in a magnetic gap of the magnetic circuit. The damper is secured to the voice coil and the frame and formed with a plurality of corrugations. The diaphragm is secured to the frame and the voice coil. One of the plurality of corrugations located on an inner circumferential side of the damper is provided with a plurality of apertures, and these apertures are covered by an elastic member.

Provided is a wheel bearing device that prevents the development of resonance with components around a bearing portion while ensuring rigidity of the wheel bearing device, offering excellent vibration absorption performance and durability. An attenuation mechanism (14) is disposed at the center in an axial direction of parallel rows of inner rolling surfaces (1a, 2a) of an internal member (3). The attenuation mechanism (14) is provided with a metal weight (15) and an elastic member (16) having a predetermined thickness and covering an outer surface of the weight (15), with attachment portions (17) formed at both ends of the elastic member. The attenuation mechanism (14) is affixed with metal fastener bands (18) fitted on the attachment portions (17). The weight (15) changes the specific number of vibrations of the bearing portion and thereby prevents the development of resonance with the components around the bearing portion in prior consideration of the point of resonance of the bearing portion and the components, whereby a wheel bearing device having excellent vibration absorption performance and durability can be provided.

A resonator having a cavity and an opening is formed. The cavity is formed between a transaxle case and a facing wall, of a first housing case, that faces the transaxle case. The opening is configured such that the cavity is partially opened to a lateral side through the opening. A volume of the cavity and a volume of the opening are set such that a resonance frequency of the resonator is lower than a natural frequency of the facing wall of the first housing case. Since the resonance frequency of the resonator is lower than the natural frequency of the facing wall, even when the facing wall vibrates at the natural frequency, the cavity does not resonate. Hereby, abnormal noise caused from the transaxle can be reduced.