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Niklas Bennstedt

Percy Norrman

Jan H Johansson

Bengt-Arne Eriksson

Rolf Silfver

Torbjörn Nilsson-Wulff

A method of stepping up the speed of a rotary motion from a first speed, supplied to an input shaft (), to a second speed delivered by an output shaft (), comprises transmitting said rotary motion from said input shaft (), via a drive gear () of said input shaft (), the drive gear () being helical and having a first helix angle (&#x3c8;), to a layshaft arrangement, so as to generate a first axial thrust (F) of the input shaft () in a first axial direction; transmitting said rotary motion from said layshaft arrangement, via a driven gear () of said output shaft (), said driven gear () being helical and having a second helix angle (&#x3c8;) that is larger than said first helix angle (&#x3c8;), to said output shaft (), so as to generate a second axial thrust (F) of the output shaft () in a second direction, said second direction being substantially opposite to said first direction; and applying said first axial thrust (F) and said second axial thrust (F) to the same location of an axially rigid support structure (), such that said first and second axial thrusts (F, F) counter-act and at least partly cancel out in said support structure ().

Stationary gear unit

A gyratory crusher has a crushing head fixedly attached to an upper portion of a substantially vertical shaft, on which crushing head a first crushing shell is mounted, and a frame on which a second crushing shell is mounted. The second crushing shell defines, together with the first crushing shell, a crushing gap. The gyratory crusher has a space adapted to contain liquid. The space is defined by a piston, which is formed at least partly of the lower end of the shaft, a cylinder, which is formed at least partly in an eccentric assembly, and a bottom element. The space is adapted to form a cushion with the aid of the liquid, so that the cushion can serve as a thrust bearing transmitting vertical forces from the crushing head to the bottom element.

Bearing for a shaft of a gyratory crusher and method of adjusting the gap width of the crusher

A gyratory crusher includes a crushing head on which a first crushing shell is mounted, and a frame on which a second crushing shell is mounted. The second crushing shell defines, together with the first crushing shell, a crushing gap. The gyratory crusher includes a space adapted to hold a liquid. The space is defined by a piston and a cylinder, any one of the piston and the cylinder being formed at least partly of a substantially vertical shaft around which the crushing head is arranged. The space is adapted to form, together with the liquid, a cushion, thereby enabling the cushion to serve as a thrust bearing and transmit vertical forces from the crushing head to the frame.

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Svärdsjö, Sweden

Niklas Bennstedt