The invention relates to a method for producing a sintered gear comprising a gear body on which at least one elastomer element is arranged, according to which a green compact is produced by pressing a powder, the green compact is sintered into a gear body and is hardened by carburization and subsequent quenching or sinter-hardening and subsequent quenching with a gas and afterwards the at least one elastomer element is vulcanized onto the gear body.

A light-weight gear including: an annular tooth portion made of metal; a shaft extending along a central axis of the tooth portion and made of metal; and a coupling element configured to couple the shaft to the tooth portion and made of a resin, in which a joining part between the shaft and the coupling element and a joining part between the tooth portion and the coupling element are provided with irregularities configured to be engaged with one another in a circumferential direction, and corners of the irregularities are rounded to release a stress. Also, provided is a manufacturing method of a light-weight gear including: disposing the tooth portion and the shaft in a mold and injecting a molten resin into a cavity of the mold, thereby simultaneously performing injection molding of the coupling element and joining the coupling element to the tooth portion and the shaft.

A composite gear includes: a first member comprising a rotation shaft portion and a disk-shaped web extending in radial directions from the rotation shaft portion; and a second member comprising at least one engaging tooth on an outer periphery thereof and provided being supported by the web so as to surround an outer periphery of the first member. A space is provided between the second member and an outermost peripheral surface of the first member in a radial direction, a space is provided between the first member and an innermost peripheral surface of the second member in a radial direction, and at least one of the first member and the second member is formed to nip another of the first member and the second member from both sides thereof in an axial direction of the rotation shaft portion.

A method for producing and reinforcing a composite gear includes providing a base material comprising a polymer and forming a composite gear from the base material, the composite gear having a gear body and at least one gear tooth extending from the gear body, the at least one gear tooth having a tooth face, a tooth flank, a tooth fillet, a tooth root, and a tooth tip. The method includes depositing a first metallic material to a first area of the at least one gear tooth of the composite gear, the first area including the tooth root of the at least one gear tooth and depositing a second metallic material to a second area of the at least one gear tooth of the composite gear. The first metallic material is applied in a first thickness and the second metallic material is applied in a second thickness.

An additive manufacturing method includes providing a first composite material and forming a composite part matrix using the first composite material and defining a first layer, applying a first fiber reinforcing material to the composite part matrix atop and in contact with the first layer of the composite part matrix such that fibers of the first fiber reinforcing material are oriented in a first direction and form a second layer on the composite part matrix, applying a second fiber reinforcing material to the composite part matrix atop and in contact with the first fiber reinforcing material such that fibers of the second fiber reinforcing material are oriented in a second direction orthogonal to the first direction and form a third layer on the composite part matrix, applying the first composite material to the composite part matrix, and curing the composite part matrix to create a composite product.

A worm gear for a worm gear system of a motor vehicle steering device may include a hub, a support element, and a gear rim. The support element may be a support ring that by means of an injection-molding method is injected between the gear rim and the hub. The support ring may connect in a form-fitting manner the hub and the gear rim. The gear rim and the support element may configure a multiplicity of teeth. The support element may have support webs that penetrate the gear rim such that radially outward pointing end sides of the support webs are exposed.

A case includes a first member and a second member configured in such a way that a closed space is formed between the first and second members in a state where the first and second members abut against each other. The first member includes a shaft portion extending toward the second member. The second member includes a shaft support portion including a circumferential wall portion that surrounds one end portion of the shaft portion. The shaft portion includes an enlarged-diameter portion that is the one end portion melted in such a way as to be enlarged in diameter.

A two-color molding method in which, when a secondary molded body is formed by covering the surface of a primary molded body made of a reinforcing-fiber-containing synthetic resin material with a reinforcing-fiber-free synthetic resin material, these synthetic resin materials may differ and the production cost does not increase. When a primary molded body is formed by injecting a molten reinforcing-fiber-containing synthetic resin material into a primary molding cavity, the molten reinforcing-fiber-containing synthetic resin material flows from one end toward the other end of the primary molding cavity and a short shot is performed. This exposes reinforcing fiber in a tooth of the primary molded body positioned at the other end of the primary molding cavity. In the secondary molding cavity, the tooth in which the reinforcing fiber is exposed is covered with a reinforcing-fiber-free synthetic resin material to form a synthetic resin gear as a two-color molded body.

The present invention discloses a rack structure, a gear and a gear transmission mechanism having the same. The rack structure comprises a rack body, a plurality of teeth formed on an outer side of the rack body, and an engaging portion formed on an inner side of the rack body, the engaging portion being shaped to engage with a connecting portion at an outer edge of the gear base; the rack structure is detachably mounted on the gear base through engagement or disengagement of the engaging portion and the connecting portion. The rack structure can be directly detachably mounted on the gear base through engagement and disengagement of the engaging portion and the connecting portion on the gear base, so that the rack structure can be assembled quickly. Once the teeth on the rack structure wear, it is feasible to replace the rack structure, without replacing the gear base.

A wide section 71d which contacts a connector member and positions the connector member relative to a connector housing part is provided in a section where a first securing part 71b of a cover member 70 is provided and is configured so as to be wider than the other parts of the section where the first securing part 71b of the cover member 70 is provided; hence, it is possible to use the wide section 71d in the pressing section (pressing point OP) of an extrusion pin. As a result, it is possible to suppress distortion of the cover member 70 and to sufficiently smooth the welded section (first securing part 71b) of the cover member 70 even when the shape of the cover member 70 is complicated.