Abstract: A driving force transmitting device includes a case, an electric motor, and a gearbox. The electric motor includes an output shaft. The gearbox includes a spur gear that rotates coaxially with the output shaft. The case includes a partition wall, a first accommodating chamber accommodating the electric motor, and a second accommodating chamber that accommodates a second driven gear. The partition separates the first accommodating chamber and the second accommodating chamber from each other. The partition wall includes a connecting hole that connects the first accommodating chamber and the second accommodating chamber to each other. The connecting hole is located on one direction side in relation to the central axis of the output shaft. At least part of the connecting hole overlaps with the spur gear when viewed in a direction along the central axis.

Abstract: A driving force transmitting device includes a case, an electric motor, and a gearbox. The electric motor includes an output shaft. The gearbox includes a spur gear that rotates coaxially with the output shaft. The case includes a partition wall, a first accommodating chamber accommodating the electric motor, and a second accommodating chamber that accommodates a second driven gear. The partition separates the first accommodating chamber and the second accommodating chamber from each other. The partition wall includes a connecting hole that connects the first accommodating chamber and the second accommodating chamber to each other. The connecting hole is located on one direction side in relation to the central axis of the output shaft. At least part of the connecting hole overlaps with the spur gear when viewed in a direction along the central axis.

Abstract: A pneumatic radial tire having a circular bead core of substantially polygonal cross section which includes a base (a) adjacent an inclined bead base portion of the tire, an inner side (b) on a side of the bead core nearest a bead toe portion of the tire, an outer side (d) on a side of the bead core nearest a bead heel portion of the tire, and a top side (c) opposite the base (a) and joining the inner side (b) and the outer side (d). An inclination .theta..sub.1 of the base (a) relative to the axial direction of the tire is substantially the same as that of the bead base portion relative to the axial direction of the tire. A cross angle .beta. between the base (a) and the inner side (b) is 70.degree. to 90.degree.. An inclination .theta..sub.2 of the top side (c) relative to the axial direction of the tire is smaller than the inclination .theta..sub.1 and the direction of inclination of the top side (c) is opposite to that of the base (a).

Abstract: A heavy-duty pneumatic tire having a plurality of belt layers, wherein the outermost belt layer is made of a steel cord having a breaking extension of 4% or more and covers the end portion in the width direction of a first belt layer adjacent to the undersurface of said outermost belt layer, a rubber stock is provided on the outside of the end portion in the width direction of said first belt layer, the cord of said first belt layer and the cord of a second belt layer adjacent to the undersurface of said first belt layer are each inclined at an angle of 15.degree. to 25.degree. with respect to the circumferential direction of the tire and cross each other.

Abstract: A heavy loading tubless tire comprising a bead portion which has a buried bead core bundled of a plurality of bead wires and having a polygonal section contour and which has its bead base composed of two regions: a region W.sub.1 located at the side of the bead heel and inclined at an angle substantially equal to the angle .theta. of inclination of a rim base with resepct to the axis of tire rotations; and a region W.sub.2 located at the side of the bead toe and inclined at a larger angle than the angle .theta. of inclination of said rim base, wherein the improvement resides: in that the width of the region W.sub.

Abstract: In a pneumatic tire having at least 3 zigzag grooves formed on the tread surace, in the zigzag groove (Ms) formed on the side of the shoulder portion, the ratio (Hs/W) of the point height (Hs) to the tread width (W) is adjusted in the range of from 2% to 4% and in the zigzag groove (Mc) formed on the side of the tread center portion, the ratio (Hc/W) of the point height (Hc) to the tread width (W) is adjusted in the range of from 6% to 10%, whereby the wet braking capacity of the pneumatic tire can be improved without reduction of the abrasion resistance of the tire.

Abstract: A heavy duty pneumatic radial tire,wherein a main area of contact with the road provided on a tread surface is formed with a circular arc, having a large radius of curvature, which crosses another circular arc having a small radius of curvature, Ra, to form an edge-shaped boundary, said radius of curvature, Ra, being larger than the depth of main grooves provided in said main area of contact with the road and smaller than the value five times as much as the depth of said main grooves,wherein narrow grooves provided on the shoulder portions are linearly provided in the circumferential direction of the tire and at a distance of 1.5 to 5 mm away towards the center of the tread surface from said edge-shaped boundary and have a groove width in the range of 1.5 to 5 mm, the direction of said narrow groove being inclined at an angle in the range of 1.degree. to 5.degree.