Coupling part for a quick-release coupling for high-pressure hydraulic lines

1. A coupling part for a quick-release coupling for a high-pressure hydraulic line comprising:

a coupling housing having a through-flow channel, a valve device disposed within the through-flow channel, and a conical valve seat surface, said valve device having a tappet-shaped closing valve for closing off the through-flow channel in an uncoupled state of the coupling part;

wherein the closing valve has a longitudinal valve axis and a valve head, said valve head having a conical surface and a valve sealing ring for sealing contact with the valve seat surface, wherein the valve sealing ring has a ring circumference surface that projects beyond the conical surface in a radial direction and has a valve seal diameter D VD ;

wherein the flow-through channel has a ring-shaped cross-sectional widened region having a maximal expansion diameter D EW , wherein the cross-sectional widened region lies radially opposite the ring circumference surface in a maximally open position of the closing valve with regard to the longitudinal valve axis,

wherein the closing valve, viewed in a direction of the longitudinal valve axis, has a first, head-side valve end and a second valve end, and the valve device has a bearing sleeve at the second valve end, and wherein the closing valve is mounted by the bearing sleeve so as to slide and to be displaceable, back and forth, in the coupling housing, in an axial direction, and wherein the coupling part has a locking device for locking the closing valve in an open position, wherein the locking device has:

a) spring clamp, having first and second spring arms,

b) the bearing sleeve which is configured with

a guide body having radially projecting guide elements, wherein the bearing sleeve is mounted by radially projecting guide elements in the coupling housing, and first and second clamp accommodation recesses that pass through the guide body, wherein the first and second spring arms pass through the first and second clamp accommodation recesses, respectively,

a guide pipe that follows the guide body at one end and projects away from the guide body in the axial direction, and

a bearing recess that passes through the bearing sleeve in the axial direction,

c) a sliding sleeve that is mounted so as to be displaceable, back and forth, in a sliding sleeve guide groove of the valve stem, by a limited amount, in the axial direction, wherein

d) the sliding sleeve and the valve stem are each mounted in the bearing recess so as to slide and be displaceable in the axial direction,

e) the sliding sleeve, the spring clamp, and the sliding sleeve guide groove interact to lock the closing valve in an open position, and

f) the guide body and the guide pipe are configured in one piece or in two pieces.

2. The coupling part according to claim 1 , wherein a ratio D EW /D VD amounts to 1.35 to 1.6.

3. The coupling part according to claim 1 , wherein the cross-sectional widened region has a circular-cylindrical expansion surface that has the maximal expansion diameter D EW .

4. The coupling part according to claim 1 , wherein the cross-sectional widened region has a trapezoid or rectangular or arc-shaped cross-section.

5. The coupling part according to claim 3 , wherein the cross-sectional widened region has a conical, widening first transition surface followed by the circular-cylindrical expansion surface, and a conical, narrowing second transition surface, wherein the expansion surface is disposed between the first and second transition surfaces.

6. The coupling part according to claim 1 , wherein the cross-sectional widened region follows the valve seat surface directly in an axial direction.

7. The coupling part according to claim 1 , wherein the coupling housing has a circular-cylindrical surface, following the cross-sectional widened region directly in an axial direction, wherein the closing valve, is mounted on the circular-cylindrical surface so as to slide.

8. The coupling part according to claim 1 , wherein the closing valve has a chambering and guide sleeve for chambering of the valve sealing ring, wherein the chambering and guide sleeve has a plurality of guide elements that are adjacent to one another in a circumference direction, wherein each guide element projects radially, and wherein the chambering and guide sleeve is mounted in the coupling housing so as to be slidable and displaceable, back and forth, in an axial direction, by the guide elements.

9. The coupling part according to claim 8 , wherein the guide elements are guide crosspieces that project in the radial direction, wherein each guide element has a longitudinal expanse parallel to the longitudinal valve axis and a domed, cylindrical outer crosspiece surface, wherein a through-flow groove is formed between adjacent guide elements in the circumference direction.

10. The coupling part according to claim 1 , wherein the closing valve has a chambering and guide sleeve for chambering of the valve sealing ring and a valve body that has the valve head and a valve stem following the valve head, wherein the valve sealing ring is disposed between the valve head and the chambering and guide sleeve in an axial direction, and held so as to be non-displaceable in the axial direction and a radial direction.

11. The coupling part according to claim 10 , wherein the chambering and guide sleeve is mounted on the valve body so as to be non-displaceable and non-rotatable.

12. The coupling part according to claim 1 , wherein the closing valve has a closed position, closing the through-flow channel off, and the maximally open position, not closing the through-flow channel, wherein the closing valve is mounted to slide and be displaceable from the closed position into the maximally open position, in an axial valve opening direction, in the coupling housing, and wherein the closing valve is mounted to slide and be displaceable from the open position into the maximally closed position in an axial valve closing direction, opposite to the valve opening direction, in the coupling housing.

13. The coupling part according to claim 12 , wherein the closing valve is lockable in the maximally open position by a locking device, in such a manner that the closing valve is mounted in the coupling housing so as to be non-displaceable in the valve opening direction.

14. The coupling part according to claim 1 , wherein the first and second spring arms engage around the valve stem on both sides of the longitudinal valve axis and are engaged in the sliding valve guide groove in the maximally open position of the closing valve, so that the closing valve is non-displaceable in the valve opening position, and engage around the sliding sleeve in the closed position of the closing valve, so that the closing valve is displaceable in the axial direction in the coupling housing.

15. The coupling part according to claim 1 , wherein the valve device has a closing spring, standing in connection with the closing valve so as to drive the closing valve in a valve closing direction, wherein the closing spring is supported on the valve head at a first end of the closing spring and on the bearing sleeve at a second end of the closing spring.

16. The coupling part according to claim 1 , wherein the bearing sleeve has a spreader for spreading the spring arms during movement of the closing valve from the maximally open position to the closed position, wherein the spring arms are spread open using the spreader, in such a manner that the spring arms are pressed out of the sliding sleeve guide groove and pushed onto the sliding sleeve.

17. A quick-release coupling for a high-pressure hydraulic line comprising first and second coupling parts releaseably lockable together with one another:

wherein each coupling part has a coupling housing having a through-flow channel and a valve device disposed within the through-flow channel;

wherein each valve device has a tappet-shaped closing valve for closing the through-flow channel in an uncoupled state of the quick-release coupling; and

wherein at least one of the first and second coupling parts comprises a conical valve seat surface, wherein the closing valve has a longitudinal valve axis and a valve head, said valve head having a conical surface and a valve sealing ring for sealing contact with the valve seat surface, wherein the valve sealing ring has a ring circumference surface that projects beyond the conical surface in a radial direction and has a valve seal diameter D VD , wherein the flow-through channel has a ring-shaped cross-sectional widened region having a maximal expansion diameter D EW , wherein the cross-sectional widened region lies radially opposite the ring circumference surface in a maximally open position of the closing valve with regard to the longitudinal valve axis, and wherein the closing valve has a chambering and guide sleeve for chambering of the valve sealing ring, wherein the chambering and guide sleeve has a plurality of guide elements that are adjacent to one another in a circumference direction, wherein each guide element projects radially, and wherein the chambering and guide sleeve is mounted in the coupling housing so as to be slidable and displaceable, back and forth, in an axial direction, by the guide elements.

18. The coupling part according to claim 12 , wherein sliding of the closing valve in the axial valve opening direction, in the coupling housing, is relative to the bearing sleeve and wherein sliding of the closing valve opposite to the valve opening direction, in the coupling housing, is relative to the bearing sleeve.

19. A quick-release coupling for a high-pressure hydraulic line comprising first and second coupling parts releaseably lockable together with one another:

wherein each coupling part has a coupling housing having a through-flow channel and a valve device disposed within the through-flow channel;

wherein each valve device has a tappet-shaped closing valve for closing the through-flow channel in an uncoupled state of the quick-release coupling; and

wherein at least one of the first and second coupling parts comprises a conical valve seat surface, wherein the closing valve has a longitudinal valve axis and a valve head, said valve head having a conical surface and a valve sealing ring for sealing contact with the valve seat surface, wherein the valve sealing ring has a ring circumference surface that projects beyond the conical surface in a radial direction and has a valve seal diameter D VD , and wherein the flow-through channel has a ring-shaped cross-sectional widened region having a maximal expansion diameter D EW , wherein the cross-sectional widened region lies radially opposite the ring circumference surface in a maximally open position of the closing valve with regard to the longitudinal valve axis, wherein the closing valve, viewed in a direction of the longitudinal valve axis, has a first, head-side valve end and a second valve end, and the valve device has a bearing sleeve at the second valve end, wherein the closing valve is mounted by the bearing sleeve so as to slide and to be displaceable, back and forth, in the coupling housing, in an axial direction; and wherein the coupling part has a locking device for locking the closing valve in an open position, wherein the locking device has:

a) a spring clamp, having first and second spring arms,

b) the bearing sleeve which is configured with

a guide body having radially projecting guide elements, wherein the bearing sleeve is mounted by radially projecting guide elements in the coupling housing, and first and second clamp accommodation recesses that pass through the guide body, wherein the first and second spring arms pass through the first and second clamp accommodation recesses, respectively,

a guide pipe that follows the guide body at one end and projects away from the guide body in the axial direction, and

a bearing recess that passes through the bearing sleeve in the axial direction,

c) a sliding sleeve that is mounted so as to be displaceable, back and forth, in a sliding sleeve guide groove of the valve stem, by a limited amount, in the axial direction, wherein

d) the sliding sleeve and the valve stem are each mounted in the bearing recess so as to slide and be displaceable in the axial direction,

e) the sliding sleeve, the spring clamp, and the sliding sleeve guide groove interact to lock the closing valve in an open position, and

f) the guide body and the guide pipe are configured in one piece or in two pieces.

20. A coupling part for a quick-release coupling for a high-pressure hydraulic line comprising:

a coupling housing having a through-flow channel, a valve device disposed within the through-flow channel, and a conical valve seat surface, said valve device having a tappet-shaped closing valve for closing off the through-flow channel in an uncoupled state of the coupling part; wherein the closing valve has a longitudinal valve axis and a valve head, said valve head having a conical surface and a valve sealing ring for sealing contact with the valve seat surface, wherein the valve sealing ring has a ring circumference surface that projects beyond the conical surface in a radial direction and has a valve seal diameter D VD ; wherein the flow-through channel has a ring-shaped cross-sectional widened region having a maximal expansion diameter D EW , wherein the cross-sectional widened region lies radially opposite the ring circumference surface in a maximally open position of the closing valve with regard to the longitudinal valve axis; wherein the closing valve has a chambering and guide sleeve for chambering of the valve sealing ring, wherein the chambering and guide sleeve has a plurality of guide elements that are adjacent to one another in a circumference direction, wherein each guide element projects radially, and wherein the chambering and guide sleeve is mounted in the coupling housing so as to be slidable and displaceable, back and forth in an axial direction, by the guide elements.