Importance

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Abstract

A bucket type jaw crusher JC includes stationary jaw teeth 20 fixed to the inner surface of a side plate 11 of a bucket 10, movable jaw teeth 30 opposed to the stationary jaw teeth 20 so as to form V shapes in combination with the stationary jaw teeth 20, a toggle plate 51 which supports a lower portion of the movable jaw teeth 30, an eccentric main shaft 41 which axially supports an upper portion of the movable jaw teeth 30, and a hydraulic motor 70 which drives and rotates the eccentric main shaft 41, and the bucket type jaw crusher JC is formed to be capable of crushing an object 100 to be crushed by the movable jaw teeth 30 which are driven to reciprocate by the hydraulic motor 70 via the eccentric main shaft 41 and the stationary jaw teeth 20. This bucket type jaw crusher JC includes a shaft joint mechanism 415J which joins a drive shaft 71 of the hydraulic motor 70 to an end portion of the eccentric main shaft 41, and the shaft joint mechanism 415J is provided with an allowable rupture portion 415c which ruptures earlier than a main body shaft portion 71m of the drive shaft 71 and the eccentric main shaft 41 when an abnormal overload is applied. The shaft joint mechanism 415J includes a sleeve 414 fitted and fixed inside an end portion of the eccentric main shaft 41, and a spline shaft 415 spline-engaged in a spline hole 414a of the sleeve 414 and a spline hole 71a formed in an end portion of the main body shaft portion 71m of the drive shaft 71, and the allowable rupture portion 415c is formed by a small-diameter portion of an annular groove formed on the spline shaft 415.

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First Claim