A spark plug wrench, including:
- a tubular body, defining an axis, including a working portion and a driving portion arranged along a direction in which the axis extends, the working portion having an axial dimension larger than an axial dimension of the driving portion, the driving portion being configured to be connected with a driving tool, the driving portion including a connection hole, the working portion including an assembling hole which is non-circular and has a fixed cross-section, the assembling hole including a first inner diametric dimension, the assembling hole being in communication with the connection hole;
- a socket base, entirely disposed within the assembling hole, including a large diameter section, a small diameter section, a receiving hole and a plurality of receiving portions, the large diameter section and the small diameter section arranged along a direction in which the axis extends, the large diameter section having a first outer diametric dimension larger than a second outer diametric dimension of the small diameter section, the large diameter section being radially abutted against an inner wall of the assembling hole, the receiving hole being configured for insertion of a spark plug, the plurality of receiving portions being transverse to the axis and inserted to the socket base;
- and
- a plurality of positioning units, each of the plurality of positioning units including an elastic member and a positioning member, the elastic member and the positioning member being received in the receiving portion, the elastic member urging the positioning member so that the positioning member at least partially projects within the receiving hole for being engaged within a grooved portion of the spark plug;
- wherein the assembling hole is polygonal, the assembling hole includes a plurality of convex portions arranged circumferentially, the large diameter section is cylindrical, and the plurality of convex portions are radially abutted against an outer circumferential surface of the large diameter section;
- wherein the assembling hole further includes a plurality of grooves arranged circumferentially, the plurality of grooves and the plurality of convex portions are alternatively arranged circumferentially, at least parts of the plurality of grooves correspond to the plurality of receiving portions, and an end of the elastic member is engaged within one of the plurality of grooves;
- wherein the small diameter section is located between the large diameter section and the connection hole;
- wherein the plurality of convex portions are partially snapped within the large diameter section.