35results about How to "Reduce frictional contact area" patented technology

The invention relates to the technical field of a transmission component, in particular to a chain. The chain comprises an inner chain sheet and a chain roller; the inner chain sheet is fixedly connected with the chain roller; and the two sides of the chain roller are concave. The chain has the advantages of simple structure and strong practicability and is convenient to use; and the concave design in the middle of the chain roller is beneficial to reducing the frictional contact area between the chain roller and a chain wheel, increasing the operation flexibility of the chain and prolonging the service life of the chain, therefore, the chain has good popularization and application values.

The invention discloses a pressurizing oil-saving type piston of a diesel engine, which comprises a piston pin boss, a skirt portion and a head portion, wherein the head portion is composed of a piston top end and a ring groove, the ratio of the total height of the piston to the cylinder diameter is from 1.024 to 1.028, the ratio of the height of a piston junk to the cylinder diameter is from 12.6% to 12.8%, and the largest point gap between the head portion of the piston and the inner diameter of the cylinder is 2.2mm. A top end combustion chamber in a shape of a w-shaped pit is arranged at the head portion of the piston, a cooling oil cavity composed of a cooling oil channel, an oil inlet hole and an oil outlet hole is arranged in the head portion of the piston below the top end combustion chamber, and the oil inlet hole and the oil outlet hole are located at two ends of the cooling oil channel and communicated with a cavity inside the piston. The skirt portion is a variable elliptic type surface with the middle portion protruding outwards and both the ellipticity and the diameter variable. The pressurizing oil-saving type piston of the diesel engine can reduce inertia force of reciprocating movement, friction contact area and invalid friction work loss and can reduce clearance of cylinder matching by means of optimizing piston structure, and achieve the purposes of improving valid power and reducing consumption of fuel oil and lubricating oil and environment pollution.

The invention provides a rope supporting tensioning device and a crane with the same. The device comprises two oppositely arranged first mounting bases (10) and a tensioning mechanism (20). The tensioning mechanism (20) is arranged between the two first mounting bases (10) and comprises a carrier roller component (21) and a compression component (22). Two ends of the carrier roller component (21) are in one-to-one corresponding connection with the two first mounting bases (10), and the carrier roller component (21) is provided with a rope winding cambered surface extending along the axial direction of the carrier roller component (21) and arranged in a radial movable mode relative to the two first mounting bases (10) to tension a hoisting rope (31) wound on the rope winding cambered surface. The compression component (22) is arranged on the first mounting bases (10) and in drive connection with the carrier roller component (21). By means of the device and the crane with the same, the phenomenon that the steel wire rope leaps and jumbles easily on a winding cylinder and a pulley can be changed, abrasion to the hoisting rope is reduced, and the service life of the hoisting rope is increased.

The invention relates to a method for designing friction catalysis to realize ultra-low friction of a carbon film. The method refers to: first adding metal nanoparticles into absolute ethanol, ultrasonically dispersing to obtain a metal nanoparticle solution; and then spin-coating the metal nanoparticle solution On the surface of the carbon-based film, a metal nanoparticle coating is obtained; finally, mechanical friction stirring is used to promote the mixing of carbon-based film wear debris and metal nanoparticles, and a ball-like particle coating with embedded metal nanoparticles and coated graphene is obtained. . The invention introduces the metal nano-particles as a catalyst into the friction interface of the carbon-based film, and improves the problems of high friction coefficient and environmental sensitivity in a single friction process through the synergistic effect of friction and catalysis.

The invention discloses a cutting tool for a hard gelatin traditional Chinese medicine processing machine. The cutting tool comprises a cutting handle and a cutting head, wherein the cutting head is columnar and comprises a cutting core and three or four cutting edges uniformly and spirally arranged at the outer edge of the cutting core; scrap containing space is formed between each two adjacent cutting edges; each cutting edge comprises an edge point and an edge root, the edge point comprises a cutting side face and a non-cutting side face, the direction of the cutting side face is opposite to the spiral direction of the cutting edge, and the direction of the non-cutting side face is as the same as the spiral direction of the cutting edge; a first edge belt and a second edge belt are arranged on the cutting side face of each edge point, a first relief angle formed by the intersecting of the first edge belt and the horizontal plane is 11-13 degrees, a second relief angle formed by the intersecting of the second edge belt and the horizontal plane is 27-29 degrees, a front angle formed by the intersecting of the non-cutting side face and a vertical face at an outer point of the edge point is 9-11 degrees, and a bearing mounting section and a transmission part mounting section are mounted in the middle of the cutting handle. By utilizing the cutting tool, the powder of the cut hard gelatin traditional Chinese medicine is in a flocculent flake shape, is immediately dissolved into water and is smoothly discharged under the premises that the rigidity and strength are sufficient.

The invention relates to a multifunctional brake disc of an electric vehicle, which mainly comprises a brake disc and is characterized in that the inner side of the circumference of the brake disc is provided with a plurality of notches; the outer side of the circumference of the brake disc at corresponding location of the notches is provided with a plurality of lugs; recesses among the lugs are set into locking holes; and the locking holes are matched with a spring bolt. In the multifunctional brake disc of the electric vehicle, as the inner side of the circumference of the brake disc is provided with the notches so as to reduce noise when braking is performed, and the periphery of the brake disc is provided with the lugs, airflow is generated when the brake disc rotates to perform accelerated cooling on heat generated when the braking is performed, and moreover, the recesses among the heat dissipation lugs are used as the locking holes, thus, the multifunctional brake disc of the electric vehicle has a very simple structure, and not only is easy to manufacture, reduces the cost but also improves the braking performance.

The invention discloses a powder metallurgy oil-free lubricating bearing and a method for preparing the same. The powder metallurgy oil-free lubricating bearing comprises a shaft body provided with anaxial central hole, and the outer surface of the shaft body is provided with an oil storage tank. The preparation method comprises the following steps: (1) evenly mixing Cu-Sn powder and C powder forforming, wherein the weight portion of all components is that: C is 0.5 to 3.0 portion, Cu is 85 to 93 portions and Sn is 5 to 13 portions; (2) controlling the temperature to between 650 and 730 DEGC, and performing sintering; (3) orderly performing finishing and cleaning; (4) performing vacuum oil immersion; and (5) performing deoiling treatment. The product has high precision and good dimension stability. Because the internal diameter tolerance of the product is controlled at 8u, and the axiality of the product is less than 0.05mm, and the matching gap between the product and the shaft issmall, so that the friction contact area is small, the rotating efficiency of a fan is improved, the operating noise of the fan is reduced, and the service life of the fan is prolonged.

The invention relates to a tray fixing and conveying device used for integrated doffing of a spinning machine. A conveying guide rail comprises a double-guide rail structure which is provided with a convex arc-shaped limit surface at the inner side and an arc-shaped supporting surface at the top, a tray structure comprises more than two tray supports, trays and tray pressing plates, a sliding seat of each tray support is arranged on double guide rails, the inner concave cambered surface of each sliding seat is matched with and limited by the convex arc-shaped limit surface on the double guide rails, the arc-shaped supporting surface of the double guide rails supports the sliding seats of the tray supports, at least one pollution discharge channel is formed on the inner concave cambered surface of each sliding seat, the trays are accordingly placed on respective tray supports, a first locating column and a second locating column on each tray support and a first locating column on an adjacent tray support are limited in the horizontal direction, each tray pressing plate is arranged on a respective corresponding tray support by virtue of a connecting piece, and a depositing stand pipe is arranged on each tray pressing plate. The tray fixing and conveying device provided by the invention is reasonable in structure, better fixation property of the trays can be guaranteed, abrasion is small, and operation is stable and reliable.