Arrangement for achieving a reciprocal motion in particular for a chain saw

An arrangement that is turnable around an axis of rotation (15′), having two interacting shaft parts (2\ 15;

• 15b, 3, 3′) for limited joint (coordinated) rotating motion, where the shaft parts can either drive the arrangement's parts for the rotary motion via an external energy source, or generate energy through a rotary motion supplied by the arrangement's shaft parts, whereby the two said shaft parts (2, 3) are coordinated via an intermediary bearing arrangement (10, 11, 12, 13;
• 14), where the parts of the bearing arrangement (10) are called a stator component or unit (2′, 15) and a rotor component or unit (14, 15b, 3, 3′) or vice versa, where said stator component is comprised of a number of perforated discs (11, 12, 13) for the one shaft part (15) that are aligned with each other and configured to surround the perforated rotor part (14) for the other shaft part (15b, 3, 3′), wherein the perforated discs (11, 12, 13, 14) for the arrangement (10) are configured so that, via a cavity (13″) that is formed, they interact with each other via a hydraulic pressure as well as hydrostatic pressure, in order in each case to create, through an oscillatory or reciprocal motion between the stator component and the rotor component, a low level of friction between the stator component (11, 12, 13) and the rotor component (14) and their common sliding or bearing surfaces (131, 141).

An arrangement that can be turned by an assigned hydraulic pressure and flow related to a chain saw (1), supported by a harvesting unit (100) for crosscutting of timber (103), and the like, wherewith a bearing arrangement (10) is set up for said chain saw and oriented between a guide bar housing (2′) and a drive motor unit (3) for the chain saw in order to be able to provide the chain saw (1) with an oscillatory motion (swinging motion) that is connected with and oriented in the plane of the guide bar (“P”), while performing a crosscutting motion, whereby this reciprocal or oscillatory (swinging) motion can be activated via a hydraulic control valve (36), through which a hydraulic flow is controlled via connections (13a, 13b) to said bearing arrangement (10), wherein said bearing arrangement (10), which is activated via a hydraulic pressure as well as a hydrostatic pressure to a built-in cavity (13″), is coordinated with a guide bar housing (2′), and with a drive motor unit (3), for an oscillatory or reciprocal motion, via perforated discs (11, 12, and 14) arranged in parallel and around a common axis of rotation (15′) for a drive shaft (5′).