5results about How to "Improve fatigue durability" patented technology

The invention discloses an anti-fatigue longitudinal beam assembly, a frame and a mine car, relates to the field of mine trucks, and aims to improve the bearing characteristic of the anti-fatigue longitudinal beam assembly. The anti-fatigue longitudinal beam assembly comprises two anti-fatigue longitudinal beams which are symmetrically arranged relative to the center line of the width direction of the anti-fatigue longitudinal beam assembly in a spaced mode, and each anti-fatigue longitudinal beam comprises a first box body, a second box body and a third box body. The first box bodies are constructed to be unequal in height, and the first box bodies are constructed to be equal in strength; the second box bodies are constructed to be unequal in height, and the second box bodies are constructed to be equal in strength; the third box bodies are constructed to be unequal in height, and the third box bodies are constructed to be equal in strength; wherein the second box body is located between the first box body and the third box body. According to the technical scheme, not only is the weight light, but also the bending rigidity and the strength are very high, and the anti-fatigue capability is very good.

The utility model relates to a kind of plate spring lug bush structure, belong to automobile field, including first bush (1) and second bush (2), the first bush (1) includes first sleeve (3) and is equipped on first sleeve (3) first flange (4), first flange (4) is equipped with first boss (5), the second bush (2) includes second sleeve (6) and is equipped on second sleeve (6) second flange (7), second flange (7) is equipped with second boss (8).First sleeve (3) and second sleeve (6) are connected by lug pin shaft (9), first lug pressing plate (10) and second lug pressing plate (11) are respectively equipped at the both ends of lug pin shaft (9), boss on flange face surface, can prevent flange face edge stress concentration and the effect of interference fastening, improve the fatigue endurance of lug bush, reduce the risk of cracking.

The application discloses an antibacterial bio-based polyamide elastomer and a preparation method thereof. The preparation method comprises the following steps: preparing a polyamide prepolymer containing a tertiary amine structure through ring-opening polymerization reaction of caprolactam, N-diethyl-aminocaprolactam and sebacic acid, then reacting with polytetramethylene ether glycol to form a polyamide-polyether block copolymer elastomer, and further modifying the polyamide-polyether block copolymer elastomer through reaction with a halogenated hydrocarbon to realize quaternary ammonium modification, so that the quaternary ammonium salt antibacterial group is stably introduced into the polymer molecular structure in a covalent manner. The bio-based polyamide elastomer prepared by the application has excellent elastic properties and persistent and stable quaternary ammonium antibacterial properties, the antibacterial components are not easy to migrate and lose, the preparation process is simple and controllable, is suitable for the field of functional materials, and has a good application prospect.

The lining comprises a core, an outer ring and a lining module arranged between the core and the outer ring, the lining module comprises more than two lining units capable of being spliced to form a circular ring, and each lining unit comprises an arc-shaped block, an inner arc-shaped piece arranged on the inner side of the arc-shaped block and an outer arc-shaped piece arranged on the outer side of the arc-shaped block; the central angles of the arc-shaped block, the inner arc-shaped piece and the outer arc-shaped piece are the same, the arc-shaped block is a rubber piece, and the inner arc-shaped piece and the outer arc-shaped piece are metal pieces. According to the use principle, the multiple lining units are assembled to form the lining module, raw materials of the arc-shaped blocks in the lining units of different specifications can be changed according to the actual situation, and then the requirement for the complex rigidity performance is fully met.

An object of the present invention is to provide a two-pack type curable adhesive composition that can provide high fatigue durability and high damping performance in a compatible manner. The present invention provides a two-pack type curable adhesive composition including a base (A) containing a urethane prepolymer (a1) having an isocyanate group, and a curing agent (B), at least one of the base (A) or the curing agent (B) containing polymer particulates (X) having an average particle size of from 0.01 to 200 µm, the polymer particulates (X) having a glass transition temperature of from -40°C to +80°C, a content of the polymer particulates (X) being 5 mass% or greater in a total amount of the two-pack type curable adhesive composition, a cured product (P) obtained by curing the two-pack type curable adhesive composition having a loss tangent of 0.15 or greater under conditions of a temperature region of from -40°C to +80°C and a frequency of 100 Hz, and the cured product (P) not breaking under conditions of a stress amplitude of 2.8 MPa and a repetition number of up to 107 times in a tensile shear fatigue property test in accordance with JIS K6864.