Golf club shaft for wood club

摘要

A golf club shaft which satisfies strength and is lightweight is provided by the present invention. This golf club shaft comprises one or more fiber-reinforced resin layers, and is characterized by satisfying the following relationship (1), wherein x [mm] is the displacement in a cantilever bending test, M [g] is the mass of the golf club shaft, and L [mm] is the length thereof, and by satisfying the following strength standard values [1]-[4]: M×(L/1168)<49.66 e−0.0015x (relationship 1); [1] the three-point bending strength at T-90 (the position 90 mm apart from the smaller-diameter end) is 800 N or higher; [2] the three-point bending strength at T-175 (the position 175 mm apart from the smaller-diameter end) is 400 N or higher; [3] the three-point bending strength at T-525 (the position 525 mm apart from the smaller-diameter end) is 400 N or higher; and [4] the three-point bending strength at B-175 (the position 175 mm apart from the larger-diameter end) is 400 N or higher.

主权项

1. A golf club shaft formed of one or more fiber-reinforced resin layers, the golf club shaft comprising:
a bias layer that is formed by overlapping fiber-reinforced resin layers, in which orientation directions of reinforcing fibers are +35° to +55° and −35° to −55° relative to a longitudinal direction of the shaft, with each other; a straight layer that is formed of a fiber-reinforced resin layer in which an orientation direction of the reinforcing fiber is −5° to +5° relative to the longitudinal direction of the shaft; and a hoop layer that is formed of a fiber-reinforced resin layer in which an orientation directions of the reinforcing fiber is +85° to +95° relative to the longitudinal direction of the shaft, wherein the hoop layer is formed of two fiber-reinforced resin layers of a first hoop layer and a second hoop layer, the two hoop layers have an overlapped portion, one end of the overlapped portion is located between 125 mm and 375 mm apart from the small-diameter end part of the shaft, and the other end of the overlapped portion is located between 675 mm and 925 mm from the small-diameter end part of the shaft.