38results about How to "Increased transmission loss" patented technology

[Purpose] A belt drive system, in which a drive belt 20 is wrapped between a drive pulley 1 drivingly connected to a drive source 11 and a driven pulley 2 connected to an driven unit 12 via a joint 32 provided to stop torque transmission when receiving a load equal to or over a predetermined value and torque is transmitted via the drive belt 20 from the drive pulley 1 to the driven pulley 2, ensures that when the driven unit 12 malfunctions, the joint 32 stops the torque transmission without unnecessarily increasing the coefficient of friction against the driven pulley 2 or the belt tension.

[Solution] The belt drive system is configured so that when a slip corresponding to the load on the joint 32 equal to or over the predetermined value occurs between the drive belt 20 and the driven pulley 2, the coefficient of friction between the drive belt 20 and the driven pulley 2 becomes higher than that before the slip occurs.

The present invention provides a colored optical fiber that shows anti-microbend property and hot-water resistance, an optical fiber ribbon that utilizes the same, and an optical fiber cable.

It is a colored optical fiber 1, which comprises two coating layers of a primary coating layer 31 and a secondary coating layer 32, wherein either one of the primary coating layer 31 or the secondary coating layer 32 is colored, both coating layers have equilibrium elastic moduli of 60 MPa or less, and the secondary coating layer 32 has a relaxation modulus of 410 MPa or more, an optical fiber ribbon 4 that utilizes it, and an optical fiber cable 8.

The invention discloses an automobile noise reduction system with one-fourth wavelength pipes combined with a Helmholtz silencer, and belongs to the technical field of environment control and improvement in order to solve the problems that an existing automobile noise reduction system is high in manufacturing cost, poor in noise elimination effect, high in air inlet resistance and consumed power, poor in fuel economy and not suitable for various automobiles. The Helmholtz silencer is communicated with the side wall of a front air inlet guide pipe, the front air inlet guide pipe is communicated with an air filter, an air filtering net is arranged in the air filter, the air filter is communicated with a first rear air inlet guide pipe, the first rear air inlet guide pipe is communicated with a second rear air inlet guide pipe through a flexible connecting pipe, an air throttling valve is arranged on the second rear air inlet guide pipe, the second rear air inlet guide pipe is communicated with an air inlet header pipe, the air inlet header pipe is communicated with an air inlet manifold, and one ends of the two one fourth wavelength pipes are both connected and communicated with the side wall of the first rear air inlet guide pipe. According to the system, while power property and economy of an automobile are maintained, the noise of the whole automobile can be lowered particularly, the environment quality can be improved, and the system is suitable for various automobiles.

A composite cable that is able to prevent both the unfastening of the cable end from the connector and the occurrence of the bending distortion of the optical fiber, to both of which the expansion and shrinkage of the overall sheath is responsible, is provided. The composite cable comprises a stranded wire that is a strand of a plurality of insulated conductors each of which is a conductor with insulation covering thereon, an optical fiber ribbon that has a plurality of optical fibers parallelly-arranged in a row, and an overall sheath that covers the stranded wire and the optical fiber ribbon in a bundle, wherein the composite cable has a deterrent positioned on outer side of the stranded wire and the optical fiber ribbon parallelly-arranged in a row along the width direction of the overall sheath for deterring expansion and shrinkage of the overall sheath. Further, the composite cable has a bonding jacket between the deterrent and the overall sheath for making the deterrent adhere to the overall sheath; alternatively, the deterrent has a patterned indented shape on the surface thereof for making the deterrent adhere to the overall sheath.

A geared turbine machine integrates driving and/driven devices into mechanical transmission lines through an integrated transmission mechanism, wherein the integrated transmission mechanism comprises a central bull gear with a bull gear shaft, at least two pinions with pinion shafts, and a drive pinion with a drive shaft, wherein the drive pinion is arranged between the bull gear and the first pinion, and meshed with the bull gear, as well as with the first pinion, the bull gear is in operative connection with the second pinion, the bull gear shaft is at least in non-rotatable connection with the driving and/driven devices, the drive shaft of the drive pinion is non-rotationally connected to at least one driving device, and the end portion of the pinion shafts is at least in non-rotatable connection with the driving and/driven devices. The bull gear is so connected to the second pinion in operative connection that between the bull gear and the pinion is arranged with an intermediate idle gear, which is meshed with both the large wheel, as well as with the second pinion.

An optical fiber which reduces transmission loss increase even in a high humidity environment or under water is provided. To solve the above issue, an optical fiber according to the present invention comprises a glass optical fiber coated with at least two coating layers, soft and hard layers. The optical fiber is further coated by a colored resin to make a colored optical fiber. The hard layer and the color layer of the colored optical fiber have a free volume radius of at least 0.290 nm according to positron annihilation lifetime spectroscopy.

In order to prevent a spectrum of a wavelength channel from becoming narrower, a device according to the present invention includes a light dividing section capable of dividing a wavelength spectrum in an input light beam and outputting a plurality of divided light beams, which are spatially separated and have wavelength spectrum portions different from each other, and a wavelength-to-spacial-position-converter capable of spatially multiplexing the wavelength spectrum portions of the plurality of divided light beams from the light dividing section.

A transmission loss of each dried and water-saturated plastic optical fiber (POF) is measured. In range from 500 nm to 720 nm and from 785 nm to 810 nm, the transmission loss P1 of the dried POF and a difference of the transmission loss from the water-saturated POF to the dried POF satisfy at least one of the conditions, 0≦L/P1≦1, 0<L≦100 and 10≦L+P1≦200. Further, in the wavelength range from the ultraviolet ray to infrared ray, the absorption wavelength of OH vibration in water contained in the POF and the absorption wavelength X of harmonic absorptions of atomic vibrations are detected, and the above conditions are the wavelength ranges except the absorption wavelength X. In the performance of optical communication in these wavelength ranges, the transmission loss does not increase so much even when the the POF absorbs water. Therefore the adequate optical communication can be performed stably.

A metal-clad laminate includes an insulating layer including a cured product of a resin composition, and a metal foil disposed on a principal surface of the insulating layer. The resin composition includes a polyphenylene ether copolymer and a thermosetting curing agent, the polyphenylene ether copolymer having an intrinsic viscosity measured in methylene chloride at 25° C. of between 0.03 dl/g and 0.12 dl/g, inclusive. And the polyphenylene ether copolymer has, at a molecular terminal, a group represented by formula (1) or formula (2) at an average number of 1.5 to 3 per one molecule. Further, the metal foil has a first surface that is in contact with the insulating layer, the first surface having a 10-point average roughness (Rz) of 2.0 μm or less. And the metal foil includes a barrier layer disposed at a side of the first surface, the barrier layer containing cobalt.

There is provided a resin coated optical fiber, comprising at least: a glass optical fiber composed of a core and a clad for coating the core; a primary layer made of UV-curing resin in contact with the glass optical fiber; and a secondary layer made of the UV-curing resin disposed on an outer periphery of the primary layer, wherein the primary layer has a two-layer structure of an inner layer in contact with a surface of the clad, and an outer layer for coating the inner layer, wherein the UV-curing resin of the inner layer has Young's modulus of 0.9 MPa or more and 3.0 MPa or less at room temperature in a film state based on JIS standard K7113, and the UV-curing resin of the outer layer has Young's modulus of 0.1 MPa or more and 0.7 MPa or less at room temperature in a film state based on JIS standard K7113.

The present invention relates to an optical transmission line and the like having a chromatic dispersion with a small absolute value as a whole within a signal wavelength band including S, C, and L bands. This optical transmission line comprises a single-mode optical fiber and a dispersion-compensating optical fiber which are connected to each other; and has, as characteristics of the whole optical transmission line at a wavelength of 1550 nm, a chromatic dispersion with an absolute value of 4 ps/nm/km or less, and a dispersion slope of −0.015 ps/nm²/km or more but less than 0 ps/nm²/km. Its chromatic dispersion has a maximum value within a wavelength range of 1450 to 1530 nm, and a minimum value within a wavelength range of 1570 to 1620 nm.

An antenna device includes a transmission line for propagating high frequency signal, and a plurality of antenna elements connected to the transmission line. The transmission line includes a first plate-shaped conductor, a second plate-shaped conductor, and a third plate-shaped conductor electrically grounded, a first central conductor disposed between the first and second plate-shaped conductors, a second central conductor disposed between the second and third plate-shaped conductors, an electrically connecting member inserted in an inserting hole formed through the second plate-shaped conductor, to electrically connect the first and second central conductors together, and an electrically grounded conductor disposed adjacent to the electrically connecting member. At least one of the first and second central conductors is provided with a through hole formed adjacent to the electrically connecting member, thereby electrically connects together wiring patterns provided on both surfaces, respectively, of a dielectric substrate of the at least one of the first and second central conductors.

The invention relates to a muffler of a double-section expansion chamber for developing induction noise of an automobile, which can provide a wider anechoic frequency range. The invention adopts the technical scheme that the muffler of the double-section expansion chamber of the automobile is provided with an expansion chamber and is characterized in that the expansion chamber comprises a left expansion chamber and a right expansion chamber; an inlet and an outlet of each expansion chamber are both provided with inserting pipes, wherein the inlet of the left expansion chamber and the outlet ofthe right expansion chamber share one inserting pipe.

The invention discloses a bladeless fan. The bladeless fan comprises a seat, a base and a nozzle on the base, wherein the nozzle is flat and slender, and is gradually reduced from the bottom up, the shell of the nozzle is divided into a left side, a right side, a front end and a rear end, the areas of the left side and the right side are large, the areas of the front end and the rear end are small, the rear end of the shell of the nozzle is close, and the front end is provided with a slot-like air outlet, which is used for receiving and jetting airflow; and the interior of the nozzle comprises a gradually reduced air passage and noise-reducing boards arranged on both sides of the air passage. The bladeless fan provided by the invention ensures that the wind flowing into the gradually reduced air passage from a wind guide cover in the spherical base can flow through the noise-reducing boards and that the resonance generated by the wind flow flowing through small holes is utilized to achieve a good noise-reducing effect. Consequently, the transmission loss of noise in the nozzle is increased, the outward transmission of the noise in the nozzle is inhibited, and the noise outside the fan is decreased; and moreover, the noise-reducing boards are convenient to machine and easy to mount, and only has little resistance to wind.

This invention relates to a copolymer prepared by polymerizing at least a vinyl compound (A) which gives a homopolymer with a refractive index of 1.50 or more, a fluoroalkyl (meth)acrylate (B) represented by the following formula (1) and methyl methacrylate (C), wherein a weight ratio of monomer (A) component/monomer (B) component ((A)/(B)) in the copolymer is within the range of 0.2 to 1; as well as a plastic optical fiber and a plastic optical fiber cable comprising a clad made of the copolymer. This invention can provide a plastic optical fiber and a plastic optical fiber cable exhibiting a reduced transmission loss, minimizing increase in a transmission loss even when being held as a bobbin-wound form, exhibiting a reduced bend loss and can transmit a wide-band data.

(In the above formula, X represents H or CH₃; and Rf represents fluoroalkyl having 7 to 14 carbon atoms both inclusive and 13 to 25 fluorine atoms both inclusive.).

The invention relates to a dual-mode air inlet system of an automobile. The dual-mode air inlet system of the automobile comprises an air filter and an air inlet pipe provided with an air inlet. The air outlet end of the air inlet pipe communicates with an air inlet cavity of the air filter through a normally-open pipe. An air outlet cavity of the air filter is connected with an air filter air outlet pipe connected with an engine. The air outlet end of the air inlet pipe further communicates with the air inlet cavity of the air filter through a normally-closed pipe. A semi-active control valve is installed on the normally-closed pipe and provided with a valve block used for controlling the circulation sectional area of airflow in the normally-closed pipe. When the speed of the airflow entering the air inlet is higher than a set value, the circulation sectional area of the airflow is increased along with the increase of the speed of the airflow till the maximum opening degree of the valve block is achieved; and when the speed of the airflow entering the air inlet is smaller than the set value, the circulation sectional area of the airflow is zero. By the adoption of the dual-mode air inlet system of the automobile, the problem of contradiction between air inlet noise lowering and power loss reducing of an existing air filter is solved.

A routing structure of a two-core parallel shielded electric wire includes:

• • two insulated electric wires that are arranged in parallel; and
  • a shield layer that is attached around the two insulated electric wires and extends in a longitudinal direction of the two insulated electric wires.

In the routing structure, the two-core parallel shielded electric wire is rerouted by bent twisting the two-core parallel shielded electric wire in a short axis direction at a route change point along a long axis direction of the two-core parallel shielded electric wire, and the number of bent twisted points in the short axis direction is 1.43 or less per meter.

The invention discloses a power driving system and a vehicle. The power driving system comprises a first motor, a first clutch, a second clutch, a third clutch, a first input shaft, a second input shaft, a third input shaft, an output shaft, a first gear set, a second gear set and a third gear set. The first motor is connected with the first input shaft, the second input shaft and the third inputshaft through the first clutch, the second clutch and the third clutch respectively, and the first input shaft, the second input shaft and the third input shaft are connected to the output shaft through the first gear set, the second gear set and the third gear set respectively. The first gear set, the second gear set and the third gear set correspond to three speed ratios. By switching the firstclutch, the second clutch and the third clutch, three-gear speed changing of the first motor can be achieved, different driving force requirements can be met, and the vehicle economy is improved. Thestructure is simple and compact, the number of used parts is small, the energy transmission loss is small, and the system efficiency is improved.

The invention relates to the technical field of inverter heat dissipation, in particular to a fan assembly and an inverter. The fan assembly comprises a fan mesh enclosure, a fan main body and a noise reduction mounting part, the fan main body is right opposite to an air inlet, the air inlet is covered with the fan mesh enclosure, and the noise reduction mounting part is arranged on the fan main body so that the spacing distance between the fan main body and the fan mesh enclosure can reach the preset distance. The noise reduction mounting part is configured to mount the fan main body on a to-be-mounted part in a buffering mode. The noise reduction mounting part can enable the spacing distance between the fan main body and the fan mesh enclosure to reach the preset distance, so that high-order vortex is prevented from being formed when air flows through the fan mesh enclosure, and aerodynamic noise is reduced. In addition, the noise reduction mounting part plays a role in vibration isolation between the fan main body and the to-be-mounted part, and the sound quality is improved. According to the provided inverter, by applying the fan assembly, resonance can be prevented from being formed between the fan main body and the to-be-mounted part, aerodynamic noise can be reduced, and the sound quality can be improved.