摘要:
[Problem] Provided is a method of manufacturing a resin retainer having two annular sections, which can prevent each of the annular sections from being deformed in the radial direction. [Solution] A fixed-side cavity forming mold 6 has a first axial mold surface 6A that is in contact with an axial end surface of one of the annular sections of a resin retainer A having two annular sections, and a first protruding portion 11A protruding from the first axial mold surface 6A. A movable-side cavity forming mold 7 has a second axial mold surface 7A that is in contact with an axial end surface of the other one of the annular sections of the resin retainer A, and a second protruding portion 12A protruding from the second axial mold surface 7A. A slide core sliding step is performed in which slide cores 8 are slid toward an outer diameter and pocket-forming protruding portions of the slide cores 8 are extracted from a pocket of the retainer A, and then a mold opening step is performed in which the movable-side cavity forming mold 7 is opened relative to the fixed-side cavity forming mold 6.
摘要:
[Problem] An object of the present invention is to prevent, in a protective cover having a sensor holder part and a separation wall between a magnetic encoder and a magnetic sensor, defectiveness due to burning or short shot from occurring on the separation wall, without lowering the non-defective rate of the protective cover. [Solution] The protective cover having a cup shape is mounted to an outer ring of a bearing so as to seal an inward-side end portion of the bearing. A protective cover 1 includes: a disc part 2 made of a synthetic resin; and a sensor holder part that is made of the synthetic resin and protrudes inward from the disc part 2. The disc part 1 is provided with a separation wall which separates the magnetic encoder and the magnetic sensor from each other. The separation wall 5 has a surface facing the magnetic encoder and a surface facing the magnetic sensor, and one of the surfaces has a mark M of a gas drainage pin of an injection molding die.
摘要:
There is provided a rotary seal having uneven surfaces formed on sliding contact surfaces of a slinger with which seal lip portions of a seal member come in contact, in which wear of the seal lip portions is reduced, resulting in increased reliability. The rotary seal (1) includes: a core metal (3); the seal member (4) having a base portion (4A) joined to the core metal (3) and the seal lip portions (4B, 4C, and 4D); and the slinger (2) having the sliding contact surfaces (A and B) with which the seal lip portions (4B, 4C, and 4D) come in contact, in which each of the sliding contact surfaces (A and B) is in such a surface condition that an arithmetic average roughness Ra satisfies 0.3 µm ≤ Ra ≤ 1.0 µm, a skewness of roughness curve Rsk satisfies Rsk ≤ -1, and an average length of roughness curve element RSm satisfies 100 µm ≤ RSm, Ra, Rsk, and RSm defined by JIS B 0601:2013.
摘要:
The present invention is intended to provide an annular insert molded article that suppresses contamination of a metal mold and generation of foreign matter without increase in material costs for an adhesive or contamination of a transfer jig, and has a high adhesion strength so that, when the annular insert molded article is attached to a rotating body, the adhesive does not peel off from the insert or remain as foreign matter in the rotating body, and a manufacturing method thereof. An annular insert molded article 1 is manufactured by injection molding in a state where a thermoset resin adhesive A is applied to a joining surface of an annular insert 2 attachable to a rotating body to an annular plastic 3 and then the annular insert 2 is placed in a metal mold, where an annular plastic 3 is injection molded, wherein the range of the adhesive A applied to the annular insert 2 is a range not going beyond boundaries B1 and B2 with the annular plastic 3 by more than 3 mm, and the range does not include a portion C of the annular insert 2 to be fitted with the rotating body.
摘要:
A molded article 1 is configured such that an insert 2 is made of a steel plate and includes a cylindrical part 2A and an annular part 2B, a plastic 4 is annular in shape so as to be joined to the annular part 2B, inner diameter D1 of the plastic 4 is larger than inner diameter D2 of the annular part 2B so that no burrs at a gate mark E protrude to the inner diameter side of the molded article 1, the injection molding is conducted with a disc gate arranged on an inner peripheral surface F of the plastic 4 at a position separated from a surface of the annular part 2B, and the gate mark E resides on the inner peripheral surface F of the plastic 4 at a position separated from the surface of the annular part 2B.
摘要:
To provide a rubber composition capable of sufficiently abrading a sealing lip while sliding it in an initial stage of rotation and sufficiently reducing a running torque, and further capable of securing a sufficient sealing property. The composition includes a first compounding ingredient which is one or more kinds selected from the group consisting of calcium carbonate, magnesium oxide, aluminum oxide and barium sulfate in an amount of 50 to 200 parts by mass based on 100 parts by mass of a rubber component, and a second compounding ingredient which is one or two kinds selected from the group consisting of carbon black and a silica in an amount of more than 0 parts by mass and 50 parts by mass or lower.