Crusher

The utility model discloses a crusher, which comprises a crusher driving and transmission device. The crusher driving and transmission device comprises a driver, a first flat key, a second flat key, a hydraulic coupling, a hydraulic coupling protective cover, a first spline, a gear coupling and a gear box; the driver is connected with the hydraulic coupling through the first flat key; the hydraulic coupling is connected with the gear box through the second flat key; the hydraulic coupling protective cover is covered on the outer part of the hydraulic coupling and respectively connected with the gear box and the driver; the gear coupling is connected with the gear box through the first spline; the gear box is connected with a gear box suspension support; and the gear box comprises a cover plate on the top, a baffle plate at the bottom, a first oil drain hole formed in the side wall of the gear box, and a second oil drain hole formed in the side wall of the gear box of the crusher. The crusher is difficult to d