Method and an arrangement for controlling a linear motor
AssigneeSpeeder, A.S.
InventorTron-Halvard Fladby
Life of this patent
Estimating the term…
Abstract
A fluid driven linear motor with a piston (4) in a cylinder (5) is supplied with driving fluid under the control of a sliding valve device (8) having a slide (9) being moved between its terminal positions and being retained therein by means of the driving fluid. A pilot rod (22) connected to the piston (4) controls the supply of driving fluid to the respective sides of the slide (9). The pilot rod (22) is slidingly received in a cavity (12) in the slide and has sections (23-25) of reduced diameter which act as valves in certain positions.
Claims7
An arrangement in a fluid driven linear motor, for instance for operating a high pressure pump (1), comprising a cylinder (5) and a piston (4) the two opposite sides of which are being supplied with driving fluid from a slide valve device (8) having a slide (9) which is moved between its terminal positions under the effect of a pilot device (22) which is moved synchronously with the movements of the piston (4), the slide (9) being provided with an axially continuous cavity (12) in which said pilot device (22) is slidingly received and arranged to alternately bring the cavity (12) in fluid communication with the ends of the slide (9) when the piston (4) is at its terminal positions, the slide (9) further being provided with means (15, 19-21) for the supply of driving fluid to the cavity (12), characterized in that the cavity (12) of the slide (9) at its axially separated ends is provided with inwardly protruding seals (13, 14) which interact with the pilot device (22), and that the pilot device (22) has a first section (23) of reduced cross section which opens the said cavity (12) towards the ends of the slide when it is in a position opposite one or the other of the seals (13, 14).
Dependencies are inferred from the claim text.