30results about How to "Avoid mechanical noise" patented technology

The invention discloses a netted electronic drum, including a drum disc, a drum skin, a data collection module and a data processing module. The data collection module comprises a trigger and a conduction medium. The conduction medium is a magnetic part. The magnetic part is arranged on the drum skin. The trigger comprises a Hall sensor in non-contact coupling with the magnetic part. The netted electronic drum is advantaged in that the trigger and the conduction medium is not directly contacted, the phenomenon of contact failure is avoided, and the accurate audio signal can be generated.

A rain hat device for heavy construction equipment which is installed adjacent to an exhaust gas discharging port of a distal end portion of an exhaust pipe to prevent inflow of rainwater therein is disclosed. The rain hat device includes a mounting bracket having a fixing shaft which is installed on an upper portion of the exhaust gas discharging port of the distal end portion of the exhaust pipe, the mounting bracket fixing the fixing shaft at a position higher than the distal end portion of the exhaust pipe; and a swing cover having a cover support portion connected to the fixing shaft and extending between the fixing shaft and the exhaust gas discharging port, and a weight portion, in which the cover support portion is rotated around the fixing shaft by pressure of exhaust gas discharged from the distal end portion. The swing cover is installed on an upper portion of the exhaust gas discharging port in a floating state by the cover support portion so that a weight center is positioned between the fixing shaft and the exhaust gas discharging port when the discharging pressure of the exhaust gas is generated.

A scrolling device of human interface device and human interface device using the same is disclosed. The scrolling device of human interface device includes a plurality of touch sensing pads and performs scroll operation by sensing contact of at least one of the plurality of touch sensing pads. Thus, it is possible to prevent a mechanical noise and malfunction caused by mechanical abrasion. Further, it is possible to sense upward and downward scroll movement as well as leftward and rightward scroll movement, thus providing still more various scroll information, so that it is possible to make good use of the scrolling device of human interface device.

This invention discloses a converter test circuit. The test converter work in the inverter of 'DC - single-phase AC or three-phase AC'. That is to transform DC into single-phase or three-phase AC, thetestes converter DC-DC is connected to power supply, and there is a the DC power supply is a energy storage capacitor between the negative and positive, the AC end is connected to high inductive load. In test, described high inductive load through the pulse width modulation control of the converter, achieve the energy cycle between energy storage capacitor through reactive power. Adopt the test circuit, as long as the appropriate control of the converter can achieve converter work with the actual work in the same current and power conditions to get equal effective test data of existing technology, but the actual energy loss was very small.

A method for testing a jumpy variation in the fitting friction coefficient between a worm gear and a worm of an automobile steering system, comprising: rotatably arranging a worm gear assembly (2) on a worm gear fixing device (5), rotatably arranging a worm assembly (1) on a worm fixing device (4), and meshing the worm assembly (1) with the worm gear assembly (2); applying a pressure F to the worm assembly (1) and rotating the worm assembly (1); measuring the rotation torque T of the worm assembly (1); calculating the fitting friction coefficient between the worm gear and the worm; and plotting a graph of the jumpy variation in the fitting friction coefficient between the worm gear and the worm. The testing method applies a traditional method for testing a friction coefficient to the test of a jumpy variation of a friction pair between the fitted worm gear and worm of a reduction mechanism of a columnar electrically steering system. The method is simple and useful, and the implementation cost is low. Problems can be found in advance by this testing method during early design of a reduction structure, and the mechanical noise produced by the worm gear and the worm can be avoided in advance, thereby reducing the cost and period of post-design changes.

The invention relates to the technical field of hydraulic motor pumps, in particular to a four-quadrant operation hydraulic motor pump. The four-quadrant operation hydraulic motor pump is characterized by comprising a main shaft, a motor rotor is pressed on the main shaft, the main shaft is supported and installed on a front shell and a rear end cover through a first bearing and a second bearing,the motor rotor is connected with the main shaft through a drum-shaped spline coupling, the motor rotor is fixed in the front shell through a partition disc, a motor stator, a motor end cover, a thirdsealing ring, a second sealing ring, a first sealing ring, a third screw and a third gasket, the motor stator is pressed on an inner hole of the rear shell, the rear end cover, a first end surface sealing gasket, the rear shell and a second end surface sealing gasket are fixed on the front shell through a fourth screw and a fourth gasket, a rear sealing cover and a rear sealing cover sealing ringare fixed on the rear end cover, a front sealing cover, a first front sealing cover sealing ring and a second front sealing cover sealing ring are fixed on the front shell. The four-quadrant operation hydraulic motor pump has the advantages of being mute, efficient, energy-saving, high in power density, good in speed regulation performance, compact in structure, free of external leakage and the like, and is particularly suitable for occasions with potential load characteristics and relatively frequent switching of forward and reverse rotation.

The invention provides a synchronizing device, a synchronizing device speed regulating system and a vehicle, and relates to the technical field of vehicles. The synchronizing device comprises a gear and an output shaft. A friction plate groove is formed in the inner ring of the gear. The output shaft is provided with an oil inlet hole with a sealed end and an oil outlet hole communicating with theoil inlet hole. The outer side of the output shaft is connected with a friction plate. The output shaft is arranged on the inner ring of the gear, and the friction plate is clamped on the friction plate groove. Hydraulic oil entering the output shaft from the oil inlet hole enters the friction plate groove from the oil outlet hole to push the friction plate, so that friction force is formed between the friction plate and the side wall of the friction plate groove, and the gear and the output shaft are synchronized. The synchronizing device is compact and simple in structure, and layout spaceis saved. According to the synchronizing device, mechanical devices (gear hubs, gear sleeves, soldered teeth and synchronizing rings) are omitted, secondary impacts are reduced, and mechanical noise of the end faces of the soldered teeth of a gear sleeving machine is avoided.

An internal source fluid heat exchange system that uses the working heat from the internal nodes of the semiconductor integrated module as the source power to promote the phase conversion heat of the working fluid cycle, and is characterized in that it has a fluid working medium evaporation tube, an evaporation channel, and an evaporation chamber. The throttling valve is connected to the heat exchange base plate of the cycle, and through the mutual matching of the formula dosage of the working fluid in the power structure, two modes of phase change cycle heat exchange of the working fluid are carried out. One is the direct evaporation of the working fluid, which is called direct The exchange system, the other is the phase change heat method in which the working fluid first produces gas and then evaporates, called the exchange system, which generates working heat immediately and performs heat exchange and heat dissipation through the phase change cycle. According to various types of high-power semiconductor integration The module needs to achieve the purpose of quantitatively controlling its working temperature rise, and can be widely used in various computers, power supplies, LEDs, power amplifiers, lasers, radars, infrared and other equipment.

The invention discloses a multi-point three-dimensional tongue image acquisition unit for tongue diagnosis equipment. The multi-point three-dimensional tongue image acquisition unit comprises a hollow hemispherical support with a downward opening. The hemispherical support is 25cm in radius. Four tongue-side cameras are evenly arranged in front of the bottom of the hemispherical support. Chord length between each two adjacent tongue-side cameras is 6cm. A line connecting the center of a line of the middle two tongue-side cameras and the center of sphere of the hemispherical support is perpendicular to the line of the two cameras. The top center of the hemispherical support is provided with a tongue-top camera. The hemispherical support is provided with at least 50 point light sources which are evenly arranged on the hemispherical support. The five cameras on the hemispherical support are used for multi-viewpoint three-dimensional acquisition of tongue images at the distance of distinctive vision of eyes, three-dimensional images of tongues can be displayed completely, errors and mechanical noise and the like caused by motion of the cameras can be avoided, and judging and analyzing illness state thoroughly and completely is convenient for doctors.