Abstract: A sliding spline shaft device of the present invention includes a male spline and a female spline that is fitted to the male spline in an axially slidable manner, and at least one of the splines has a surface processed layer. The surface processed layer includes an undercoat layer, an intermediate layer containing phosphate, and a topcoat layer containing solid lubricant, in this order. The undercoat layer contains iron nitride and/or iron carbide. Thus, the surface of a base material has high hardness. As a result, microscopic deformation of the sliding surface is reduced, and increase in a real contact area is suppressed, whereby stick-slip is prevented.

Abstract: A sliding spline shaft device of the present invention includes a male spline and a female spline that is fitted to the male spline in an axially slidable manner, and at least one of the splines has a surface processed layer. The surface processed layer includes an undercoat layer, an intermediate layer containing phosphate, and a topcoat layer containing solid lubricant, in this order. The undercoat layer contains iron nitride and/or iron carbide. Thus, the surface of a base material has high hardness. As a result, microscopic deformation of the sliding surface is reduced, and increase in a real contact area is suppressed, whereby stick-slip is prevented.

Abstract: An engine starter mounting structure is provided that basically has a starter housing part, a starter insertion part, a first flange part and a second flange part. The starter housing part has an internal portion that at least partially houses a portion of a starter. The starter insertion part is arranged to provide access to the internal portion of the starter housing part for inserting the portion of the starter into the internal portion. The first flange part is disposed on an end portion of the starter housing part with the first flange part including a fastening structure that is configured to fasten the starter thereto. The second flange part is disposed in the internal portion of the starter housing part, with the second flange part having a bolt hole that is arranged and configured to receive a bolt therethrough for interconnecting an engine and a transmission together.

Abstract: An engine starter mounting structure is provided that basically has a starter housing part (3), a starter insertion part (9a), a first flange part (3a) and a second flange part (8a). The starter housing part (3) has an internal portion that at least partially houses a portion of a starter (1). The starter insertion part (9a) is arranged to provide access to the internal portion of the starter housing part (3) for inserting the portion of the starter (1) into the internal portion. The first flange part (3a) is disposed on an end portion of the starter housing part (3) with the first flange part (3a) including a fastening structure that is configured to fasten the starter (1) thereto. The second flange part (8a) is disposed in the internal portion of the starter housing part (3), with the second flange part (8a) having a bolt hole (8b) that is arranged and configured to receive a bolt (6) therethrough for interconnecting an engine and a transmission together.