Marine reversing gear assembly

1. A marine reversing gear assembly, wherein

a manual directional control valve and an electromagnetic directional control valve for a forward/reverse directional control valve for a hydraulic oil supply line have a common structure of an oil line joint surface for the hydraulic oil supply lines for a forward clutch and a reverse clutch, and

the forward/reverse directional control valve for the hydraulic oil supply line can be changed to either the manual directional control valve or the electromagnetic directional control valve by exchanging a spool of the manual directional control valve or the electromagnetic directional control valve.

2. The marine reversing gear assembly according to claim 1 , wherein a directional control valve for supplying hydraulic oil to a loose-fitting valve provided for regulating hydraulic oil pressure in the hydraulic oil supply line is equipped with a restrictor for adjusting hydraulic oil pressure applied to the loose-fitting valve.

3. The marine reversing gear assembly according to claim 1 , wherein

a spool of the manual directional control valve is a cylindrical rotator to be received in a cylinder,

the spool being provided on its outer peripheral surface with circumferential grooves which correspond to hydraulic oil communicating openings that are open at a plurality of positions on the inner surface of the cylinder and axial grooves, which axially communicate with these circumferential grooves,

communicating state of the openings can be selected by rotating the spool around the axis inside the cylinder,

a spool of the electromagnetic valve is axially inserted in a slidable manner in an adapter sleeve to be received in the cylinder,

circumferential grooves formed at the outer peripheral surface of the spool of the electromagnetic valve communicate via the adapter sleeve with the hydraulic oil communicating openings that open at a plurality of positions on the inner surface of the cylinder, and

communicating state of the openings at the inner surface of the cylinder can be selected by axially sliding the spool.

4. The marine reversing gear assembly according to claim 1 , wherein

the spool of the manual directional control valve has an axially extending oil passage that is formed in the axial center,

the axially extending oil passage communicates with at least one of the circumferential grooves and the axial grooves, and

the cylinder is provided with apertures that communicate with the axially extending oil passage.

5. The marine reversing gear assembly according to claim 1 , wherein

the adapter sleeve of the electromagnetic adapter sleeve has a dual structure of an outer sleeve and an inner sleeve,

the outer sleeve is provided with radial oil through passages that communicate, on the outer surface of the outer sleeve, with the hydraulic oil communicating openings formed at a plurality of positions on the inner surface of the cylinder and that open, on the inner surface of the outer sleeve, toward a concave portion for forming an oil passage that is formed on the outer surface of the inner sleeve, and

the inner sleeve is provided with radial openings that communicate with the radial oil through passages opening on the inner surface of the outer sleeve and that open at positions corresponding to the circumferential grooves formed at the outer peripheral surface of the spool that is disposed inside the inner sleeve.

6. The marine reversing gear assembly according to claim 1 , wherein

the spool of the electromagnetic directional control valve is provided at the shaft center with an axially extending oil passage,

at least one of the circumferential grooves on the outer peripheral surface communicate with the axially extending oil passage, and

an opening communicating with the axially extending oil passage is formed on the cylinder.

7. The marine reversing gear assembly according to claim 1 , wherein

the manual directional control valve and the electromagnetic directional control valve are disposed beforehand in parallel in the hydraulic oil supply line, as a forward/reverse directional control valve for hydraulic oil supply to the forward and reverse clutches, and

either the manual directional control valve or the electromagnetic valve can be suitably selected by a directional control valve of the oil passage.

8. The marine reversing gear assembly according to claim 1 , wherein the spool of the electromagnetic directional control valve is configured to be able to be axially shifted by manual operation so as to change the oil line.

9. The marine reversing gear assembly according to claim 1 , wherein the operation of the loose-fitting valve is controlled by a directional control valve that is operated by using oil pressure of the hydraulic oil supply line as a pilot pressure.

10. The marine reversing gear assembly according to claim 1 , wherein the operation of the loose-fitting valve is controlled by a directional control valve that is directly operated by oil pressure of the hydraulic oil supply line.

11. The marine reversing gear assembly according to claim 1 , wherein

a restrictor for controlling flow rate is provided inside the directional control valve so as to control the operation of the loose-fitting valve,

the restrictor is provided with a cylinder in which a hydraulic oil supply port and a hydraulic oil discharge port are open, on the inner surface, and a plurality of pistons each having a hydraulic oil guide groove, on the outer peripheral surface, extending from the hydraulic oil supply port to the hydraulic oil discharge port, and

the restriction amount thereof is adjustable by selectively inserting into the cylinder some of the pistons each with a different capacity of the hydraulic oil guide passage in a slidable manner.

12. The marine reversing gear assembly according to claim 11 , wherein

the hydraulic oil guide groove is provided spirally on the outer peripheral surface of the piston, and

the capacity of the hydraulic oil guide groove is varied by varying a spiral length.

13. The marine reversing gear assembly according to claim 11 or 12 , wherein the capacity of the hydraulic oil guide groove is varied by varying a cross-sectional area of the hydraulic oil guide groove.

14. A marine reversing gear assembly with a trolling device, the trolling device being configured in such a manner as to enable trolling by slippage of friction discs caused by lowering the hydraulic oil pressure applied to friction discs of a forward clutch or a reverse clutch, which can be suitably changed, and by lowering the ship speed by reducing the rotation of an output shaft to be less than that of an input shaft, wherein

either a mechanically-operated hydraulic oil pressure adjusting element or an electrically-operated hydraulic oil pressure adjusting element can be applied as a hydraulic oil pressure adjusting element for trolling to be attached to a hydraulic oil supply element for the forward clutch and the reverse clutch, and

either one of the mechanically-operated or electrically-operated hydraulic oil pressure adjusting element suitably selected can be attached to the hydraulic oil supply element.

15. The marine reversing gear assembly according to claim 14 , wherein

the mechanically-operated hydraulic oil adjusting element and the electrically-operated hydraulic oil pressure adjusting element have a common attachment to the hydraulic oil supply element, and

either the mechanically-operated hydraulic oil adjusting element or the electrically-operated hydraulic oil pressure adjusting element can be attached to the one attachment site formed on the hydraulic oil supply element.

16. The marine reversing gear assembly according to claim 14 , wherein

the attachment site on the side of the hydraulic oil supply element to which the mechanically-operated hydraulic oil pressure adjusting element or the electrically-operated hydraulic oil pressure adjusting element is attached can be sealed with a cover.

17. The marine reversing gear assembly with a trolling device according to claim 14 , wherein

the hydraulic oil supply element comprises the hydraulic oil supply lines for the forward clutch and the reverse clutch, and a hydraulic line casing for encasing the hydraulic oil supply line is connected to a gear casing for accommodating the forward clutch and the reverse clutch.

18. The marine reversing gear assembly with a trolling device according to claim 14 , further comprises

marks provided on the outer peripheral surface of the input/output shaft of the forward clutch and the reverse clutch, and

a sensor that is fixed opposite the marks and that detects the number of revolutions of an input/output shaft to the electrically-operated hydraulic oil pressure adjusting element, wherein

the sensor counts the number of times that the mark passes the sensor per a certain period of time while the input/output shaft rotates, thereby detecting the number of revolutions of the input/output shaft.

19. The marine reversing gear assembly according to claim 18 , wherein the marks are dot-like magnets and the sensor is a magnetic sensor.

20. The marine reversing gear assembly with a trolling device according to claim 19 , wherein the dot-like magnet mark is adhered to the outer peripheral surface of the input/output shaft with tape.

21. The marine reversing gear assembly with a trolling device according to claim 19 , wherein the dot-like magnet mark is embedded in a depression part formed around the shaft.

22. The marine reversing gear assembly with a trolling device according to claim 18 , wherein the marks are spline teeth formed at a shaft end, and the sensor is a sensor for detecting the spline teeth.