Leakage compensation arrangement in a control device for a fully hydraulic steering system
AssigneeSauer-Danfoss ApS
InventorsBendt Porskrog, Niels Arbjerg
Life of this patent
Estimating the term…
Abstract
A leakage compensation system in a control device (S) has a fully hydraulic steering system (1) with a supply connection arrangement having a high-pressure connection (P) and a low-pressure connection (T). A working connection arrangement has two working connections (CL, CR), a control section between the supply connection arrangement (P, T) and the working connection arrangement (CL, CR). A control element (2) for activating the control section, a steering member (3) and an auxiliary fluid path (12) has a valve arrangement (A6, A7), through which hydraulic fluid can be supplied or drained off.
Claims18
Leakage compensation system in a control device for a fully hydraulic steering system with a supply connection arrangement having a high-pressure connection and a low-pressure connection, a working connection arrangement having two working connections, a control section between the supply connection arrangement and the working connection arrangement, a control element for activating the control section, a steering member and an auxiliary fluid path with a valve arrangement, through which hydraulic fluid can be supplied or drained off, characterized in that the valve arrangement (A6, A7) of the auxiliary fluid path (12) can be activated via the control element (2);
- wherein the leakage compensation system is fully hydraulic;
- wherein the valve arrangement (A6, A7) of the auxiliary fluid path (12) comprises means for correcting the correlation between the position of the control element (2) and the position of the steering member (3);
- and wherein the control section has a housing (H), and outer rotary slide (Y) arranged to be rotatable in the housing and an inner rotary slide (I) arranged to be rotatable in the outer rotary slide, wherein the valve arrangement (A6, A7) has a throttle (A6) formed between the outer slide (Y) and the housing (H) through cooperation of a throttling groove (S1R) and a bore (10).
Leakage compensation system in a control device for a fully hydraulic steering system with a supply connection arrangement having a high-pressure connection and a low-pressure connection, a working connection arrangement having two working connections, a control section between the supply connection arrangement and the working connection arrangement, a control element for activating the control section, a steering member and an auxiliary fluid path with a valve arrangement, through which hydraulic fluid can be supplied or drained off, characterized in that the valve arrangement (A6, A7) of the auxiliary fluid path (12) can be activated via the control element (2);
- wherein the leakage compensation system is fully hydraulic;
- wherein the valve arrangement (A6, A7) of the auxiliary fluid path (12) comprises means for correcting the correlation between the position of the control element (2) and the position of the steering member (3) and wherein the valve arrangement (A6, A7) prevents a correction via the auxiliary fluid path (12) in a predetermined operating end area of the control element (2);
- further characterized in that valve arrangement (A6, A7 is made in the control sections;
- wherein the control section has a housing, an outer rotary slide arranged to be rotary within the housing, and an inner rotary slide arranged to be rotary within the outer rotary slide;
- further characterized in that valve arrangement (A6, A7) has at least one adjustable throttling arrangement in the control section;
- further characterized in that the throttling arrangement has several throttles (A6, A7, B) connected in series;
- further characterized in that one throttle (A7) is arranged between the inner and the outer rotary slide (I, Y) and one throttle (A6) between the outer rotary slide (Y) and the housing (H).
Leakage compensation system in a control device for a fully hydraulic steering system with a supply connection arrangement having a high-pressure connection and a low-pressure connection, a working connection arrangement having two working connections, a control section between the supply connection arrangement and the working connection arrangement, a control element for activating the control section, a steering member and an auxiliary fluid path with a valve arrangement, through which hydraulic fluid can be supplied or drained off, characterized in that the valve arrangement (A6, A7) of the auxiliary fluid path (12) can be activated via the control element (2);
- wherein the leakage compensation system is fully hydraulic;
- wherein the valve arrangement (A6, A7) of the auxiliary fluid path (12) comprises means for correcting the correlation between the position of the control element (2) and the position of the steering member (3) and wherein the valve arrangement (A6, A7) prevents a correction via the auxiliary fluid path (12) in a predetermined operating end area of the control element (2);
- further characterized in that valve arrangement (A6, A7 is made in the control sections;
- further characterized in that valve arrangement (A6, A7) has at least one adjustable throttling arrangement in the control section;
- wherein the control section has a housing, an outer rotary slide arranged to be rotary within the housing, and an inner rotary slide arranged to be rotary within the outer rotary slide;
- further characterized in that the throttling arrangement has several throttles (A6, A7, B) connected in series;
- further characterized in that for each rotation direction the outer rotary slide (Y) has a throttling groove (S1R, S1L), which extends over part of its circumference and overlaps with both the opening of a working connection (CR, CL) and the opening of the low-pressure connection (TR, TL), whereas the remaining part of the circumference has an auxiliary groove (S2R, S2L), which is offset laterally in relation to the throttling groove (S1R, S1L) and only overlaps with the opening of the working connection (CR, CL).
Dependencies are inferred from the claim text.