Abstract: A sizing agent for carbon fiber comprising either a component (A) and a component (B), or alternatively, a component (A?), a component (B?) and a component (D), each of which is described below. Component (A): an epoxy compound with at least 1 epoxy group within each molecule, and with a surface energy of 17 to 34 mJ/m2; component (B): an epoxy compound with at least 1 epoxy group within each molecule, and with a surface energy of at least 35 mJ/m2; component (A?): an epoxy compound with at least 2 epoxy groups within each molecule, and with a surface energy of 17 to 34 mJ/m2; component (B?): an epoxy compound with at least 2 epoxy groups within each molecule, and with a surface energy of at least 35 mJ/m2; and component (D): an anionic surfactant with an aryloxy group as a hydrophobic group, with an ammonium ion as a counter ion, and with an alkylene oxide addition quantity of no more than 10 moles.

Abstract: A sizing agent for carbon fiber comprising either a component (A) and a component (B), or alternatively, a component (A′), a component (B′) and a component (D), each of which is described below. Component (A): an epoxy compound with at least 1 epoxy group within each molecule, and with a surface energy of 17 to 34 mJ/m2; component (B): an epoxy compound with at least 1 epoxy group within each molecule, and with a surface energy of at least 35 mJ/m2; component (A′): an epoxy compound with at least 2 epoxy groups within each molecule, and with a surface energy of 17 to 34 mJ/m2; component (B′): an epoxy compound with at least 2 epoxy groups within each molecule, and with a surface energy of at least 35 mJ/m2; and component (D): an anionic surfactant with an aryloxy group as a hydrophobic group, with an ammonium ion as a counter ion, and with an alkylene oxide addition quantity of no more than 10 moles.

Abstract: A power transmission chain having a plurality of links, with each link having a pair of apertures. The links are connected by rocker pins inserted in the apertures. The radius of curvature of a convex rocker contact surface of a pair of rocker pins is from approximately 0.6 to 1.6 times the pitch of the chain. In another embodiment, each of the rocker pins includes an arc-like rocker surface, a seat surface, and a flank surface that connects the above two. The aperture includes an arc-like support surface that supports the seat surface and side surface and is located with certain clearance from the flank surface. Also, the chain pitch line is located within the aperture seat surface.

Abstract: A power transmission chain with a spring link of improved durability. The chain includes a plurality of link plates. Each of the links has a pair of pinholes. The links are interleaved and are connected by rocker joints inserted in the pinholes. Guide links are placed at the outermost sides of the inner links. A spring link with a pair of pinholes formed in it is placed between adjacent link plates. The link plate contacting parts at both ends of spring link are located outside of the link apertures. The spring links may also be placed in the chain in two different orientations.

Abstract: A rocker joint for a chain has a crescent shaped aperture. The rocker joint includes a pair of rocker pins. Each rocker pin has a circular arc rocker surface, a circular arc seat surface and a pair of side surfaces. The aperture is bounded by a circular arc support surface and a seat surface.

Abstract: In a silent chain, guide link plates are installed in a row along the sides of the link plates. The guide link plates are provided with central openings having rounded corners. The width of the inner beam portion of the central opening is limited by the inner edge of the central opening and the inner edge of the guide link. The width of the outer beam portion of the central opening is limited by the outer edge of the opening and the outer edge of the guide link plate. The width of the inner beam portion is equal to or less than the width of the outer beam portion. Alternatively, the guide link plates are provided with slits extending from the inner edge, and the inner edges of said slits are curved.