4 results about "Groove width" patented technology

A circumferential narrow groove of a pneumatic tire is disposed at a position that partitions an outer side second land portion and an outer side shoulder land portion. A center land portion is a rib that is continuous in a tire circumferential direction, and an inner side second land portion and the outer side second land portion are rows of blocks divided in the tire circumferential direction by pluralities of lug grooves. Additionally, a groove area ratio S2 of the center land portion, a groove area ratio SI of the inner side second land portion, and a groove area ratio S3 of the outer side second land portion have a relationship such that S2<S3<S1. Moreover, a groove width Wd of the circumferential narrow groove and a maximum groove width Wmax of the other three circumferential main grooves to have a relationship such that 3.1≦Wmax/Wd≦5.0.

The invention discloses a coupling pin disassembling tool of an engine test bed. The dismounting tool is structurally characterized in that a dismounting tool body is provided with a cylinder, a hexagon nut is arranged at the upper end of the cylinder, a through groove is formed in the lower end of the cylinder, the groove width of the through groove is 1mm larger than the thickness of a couplingpin head, the groove depth of the through groove is 1mm larger than the height of the coupling pin head, and the outer diameter of the detachable tool cylinder is 1mm smaller than the inner diameter of a pin penetrating hole in a coupling set of the test bed. According to the disassembling tool, in the disassembling process of the coupling set, the front end of the tool is inlaid into the pin penetrating hole in the coupling set, then the coupling pin is fixed by utilizing a spanner, finally, a nut of a threaded section of the coupling pin is rotated by using another spanner, and assembling ordisassembling can be carried out conveniently at the moment. The disassembling tool has the advantages of being easy to manufacture and very convenient to use, fastening or disassembling can be carried out when the disassembling tool sleeves the head part of the coupling pin, and therefore the problem that the head part of the coupling pin is difficult to fix can be solved, and the assembling efficiency of the test bed can be effectively improved.