JPS6213920Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a variable pitch device for a hydraulic servo variable pitch propeller.

For fluid pressure servo type variable pitch propellers such as variable pitch propellers and side thrusters,
As shown in FIG. 1, the power of the prime mover 1 is transferred to the reducer 2
The power is transmitted through the hollow intermediate shaft 3 and the propeller shaft 4 to rotate the propeller blades 5. In order to change the pitch of the propeller blades 5 in this way, as shown in FIG. This is performed through a link mechanism 9 that moves in eight directions and converts this into a rotational movement.

Displacement of the servo motor piston 7 is performed by supplying and discharging servo pressure oil to and from the servo chamber 11 or 12 via a pressure oil introduction multiple pipe 10 integrated with the piston 7. The supply and discharge of pressure oil to the pressure oil supply and discharge multiple pipe 10 in the propeller shaft 4 is carried out through the third pipe.
This is done via a supply/discharge box 13 fixed to the casing 2a of the reducer shown in the figure.

Briefly, from the pressure oil supply and discharge ports 14 and 15 provided in the supply and discharge box 13, through the supply and discharge passages 18 and 19 carved in the supply and discharge shaft 17 that rotates together with the propeller shaft and the bull gear shaft 16. Pressure oil supply/discharge multiple pipe 10
Servo pressure oil is supplied and discharged through an outer tube supply and discharge passage 22 and an inner tube supply and discharge passage 23 formed by an outer tube 20 and an inner tube 21.

The supply/discharge box 13 is separately provided with a gravity oil port 24 for supplying gravity pressure oil to compensate for the sealing of the sliding portion of the propeller blades 5 in the propeller hub 6. Gravity pressure oil, which has a lower pressure than the servo pressure oil, is applied through the provided supply and discharge passage 25 and through the space 26 between the outer surface of the outer pipe 20 of the pressure oil supply and discharge multiple pipe 10 and the inner surface of the propeller shaft 4. ing.

By the way, as mentioned above, the supply/discharge shaft 17 rotates and slides on the inner surface of the supply/discharge box 13 which is integrated with the propeller shaft 4 and is fixed, so the sliding clearance for this is provided by each seal 27a, 27b, 27c. It is set in. However, these seals are required to have a function to prevent the mixing of each servo pressure oil and gravity pressure oil, and as a result of these contradictory actions, leakage of servo pressure oil at these seals is unavoidable, and often the propeller An error occurs in pitch control.

Further, if the sealing effect is enhanced to reduce this leakage, the amount of heat generated increases, which causes problems such as the need to take countermeasures.

In addition to these, the pressure oil supply/discharge multiple pipe 10 slides in the direction of arrow 28 with respect to the supply/discharge shaft 17 every time the servo motor piston 7 is displaced, and the outer pipe 20 of the pressure oil supply/discharge multiple pipe 10 Seals 29 and 30 must be interposed to allow sliding between the supply and discharge shaft 17 and to prevent servo pressure oil from entering.
There is a drawback that the internal structure of the change-over device requires members and seals of extremely complicated shapes.

This invention was made to improve the above-mentioned drawbacks, and it reduces the number of sealing points for high-pressure servo pressure oil, reduces leakage of servo pressure oil, reduces errors in the control system and heat generation, and also reduces the amount of heat generated by the supply/discharge shaft. It is an object of the present invention to provide a variable pitch adjustment device for a fluid pressure servo type variable pitch propeller that contributes to cost reduction by reducing the number of complicated machining parts.

The feature is that the outer tube of the pressure oil supply/discharge multiple pipe is integrated with the supply/discharge shaft, and one servo pressure oil supply/discharge port is provided at the rotating sliding part of the supply/discharge box with the supply/discharge shaft. A supply and discharge path for supplying and discharging servo pressure oil into the outer tube is formed in the supply and discharge shaft, and a supply and discharge path is formed in the space that communicates with another servo pressure oil supply and discharge port provided at the rear end of the supply and discharge box. The variable pitch device is a hydraulic servo type variable pitch propeller with an open end of the inner tube that slides reciprocally within the shaft.As a result, errors in the propeller pitch control system and heat generation in the rotating and sliding parts are reduced. This makes it possible to reduce costs by reducing the number of complicated machining parts such as supply/discharge shafts and pressure oil supply/discharge multiple pipes.

Hereinafter, the present invention will be explained in detail based on FIG. 4 showing an embodiment thereof.

A pressure oil supply/discharge multiple pipe 33 consisting of an outer pipe 31 and an inner pipe 32 is built into the propeller shaft 34, and one end thereof is rotatably and slidably fitted into a supply/discharge box 36 fixed via a supply/discharge shaft 35. has been done.

The outer pipe 31 of this pressure oil supply/discharge multiple pipe 33 is connected to the supply/discharge shaft 3
The outer pipe 3 is connected to the outer pipe 3 through one servo pressure oil supply/discharge port 39 which is integrated with the supply/discharge shaft 35 of the supply/discharge box 36 and is provided between the seals 37 and 38 at the rotating sliding portion of the supply/discharge shaft 35 of the supply/discharge box 36.
A supply/discharge passage 40 for supplying and discharging servo pressure oil into the supply/discharge shaft 35 is formed within the supply/discharge shaft 35 .

Another servo pressure oil supply/discharge port 41 is provided at the rear end of the supply/discharge box 36, and an inner tube 32 that reciprocates through a seal 43 at the center of the supply/discharge shaft 35 is connected to a space 42 communicating with this port. The end portion 32a of is open. In addition, the supply and discharge box 36 is provided with a gravity oil port 44 that supplies gravity pressure oil to compensate for the seal of the sliding part of the propeller blade in the propeller hub, which is closer to the propeller blade than the seal 37, and from which it is constantly supplied and discharged. Gravity pressure oil, which has a lower pressure than servo pressure oil, passes through a supply/discharge path 45 drilled near the outer circumference of the shaft 35 and a space 46 between the outer surface of the outer pipe 31 of the pressure oil supply/discharge multiple pipe 33 and the inner surface of the propeller shaft 34. is starting to work.

Since the present invention is constructed as described above, it can be operated as follows.

When servo pressure oil is supplied from the servo pressure oil supply/discharge port 41, the servo pressure oil flows in the direction of arrow D through the inner pipe 32 of the pressure oil supply/discharge multiple pipe 33 and reaches a servo chamber (not shown). When the servo motor piston is displaced, servo pressure oil in other servo chambers flows in the direction of arrow E between the outer pipe 31 and inner pipe 32 of the pressure oil supply/discharge multiple pipe 33 and reaches the servo pressure oil supply/discharge port 39. It is then discharged. At this time, the inner tube 32 of the pressure oil supply/discharge multiple pipe 33 has a seal 43 that is displaced together with the servo motor piston.
Since the end portion 32a is slidably supported in the space 42 of the supply/discharge box 36 and a region in which the end portion 32a can be displaced is secured, it can operate without any hindrance. In addition, pressure oil supply/discharge multiple pipe 3
Although the outer tube 31 of No. 3 cannot be displaced, it may be fixed so as to open at the partition wall 47 of the servo chamber 12 as shown in FIG. It is only necessary to connect different outer tubes to the servo motor piston 7 that can slide against the servo motor piston 7.

In this way, when the propeller blades 5 reach a predetermined forward pitch, the supply and discharge of servo pressure oil is stopped and the pitch is maintained. Needless to say, in the case of a reverse pitch, the servo pressure oil is supplied and discharged in the opposite manner to that described above.

Gravity pressure oil is supplied from the gravity oil port 44 through a supply/discharge path 45 drilled near the outer periphery of the constant supply/discharge shaft 35 to the outer surface of the outer pipe 31 of the pressure oil supply/discharge multiple pipe 33 and the propeller shaft 34.
It acts on the sliding part of the propeller blade 5 through the space 46 on the inner surface of the propeller blade 5.

In the above operation, the servo pressure oil supply and discharge port 39 through which high-pressure servo pressure oil is supplied and discharged is provided in the rotating sliding part, but the supply and discharge shaft 35 has a large diameter as shown in the conventional example. Unlike the supply/discharge shaft, it can be made smaller in diameter, so the see function can be improved. In addition, since it can be kept at two locations, leakage of the servo pressure oil is reduced, improving the accuracy of the control system and reducing the amount of heat generated. Also,
The servo pressure oil seal between the supply/discharge shaft 35 and the pressure oil supply/discharge multiple pipe 33 is the seal 2 shown in the conventional example.
9, 30, etc., and the configuration of the change-over device can be extremely simplified while enhancing its functions.

As explained in detail above, in the present invention, one end of the propeller shaft, in which a pressure oil supply/discharge multiple pipe consisting of an outer tube and an inner tube is built, is rotatably and slidably fitted into the supply/discharge box via the supply/discharge shaft. In the servo pressure oil supply/discharge changing device installed, the outer tube of the pressure oil supply/discharge multiple pipe is integrated with the supply/discharge shaft, and one A supply and discharge path for supplying and discharging servo pressure oil into the outer pipe from a servo pressure oil supply and discharge port is formed in the supply and discharge shaft, and another servo pressure oil supply and discharge port is provided at the rear end of the supply and discharge box. Since the end of the inner tube that slides reciprocally at the center of the supply/discharge shaft is opened in the space communicating with the supply/discharge shaft, the structure of the seal in the sliding part can be simplified and its function can be improved. Errors in the propeller pitch control system and the amount of heat generated in the rotating and sliding parts can be reduced. In addition, the configuration and oil path are simplified, and the number of complicated machining parts such as the supply/discharge shaft and pressure oil supply/discharge multiple pipes can be reduced, resulting in significant cost reductions.

[Brief explanation of drawings]

Figure 1 is an overall configuration diagram of a variable pitch propeller, Figure 2 is a diagram of a conventional variable pitch propeller's adjustment device,
FIG. 3 is an enlarged view of the shifting device, FIG. 4 is an enlarged view of the shifting device of the present invention, and FIG. 5 is an example of how the pressure oil supply/discharge multiple pipe is installed in the propeller hub. 4... Propeller shaft, 31... Outer pipe, 32... Inner pipe, 32a... End, 33... Pressure oil supply/discharge multiple pipe,
35... Supply/discharge shaft, 36... Supply/discharge box, 39, 41...
... Servo pressure oil supply/discharge port, 40... Supply/discharge path, 42...
space.

Claims (1)

[Scope of Claim for Utility Model Registration] One end of a propeller shaft in which a pressure oil supply/discharge multiple pipe consisting of an outer pipe and an inner pipe is built-in is rotatably and slidably fitted into a supply/discharge box via a supply/discharge shaft. In the changing device, the outer pipe of the pressure oil supply/discharge multiple pipe is integrated with the supply/discharge shaft, and the servo pressure oil supply/discharge port is provided at a rotating sliding portion of the supply/discharge box with the supply/discharge shaft. A supply/discharge passage for supplying and discharging servo pressure oil into the outer tube is formed in the supply/discharge shaft, and a space communicating with another servo pressure oil supply/discharge port provided at the rear end of the supply/discharge box, A variable pitch adjustment device for a fluid pressure servo type variable pitch propeller, characterized in that an end of an inner tube that slides reciprocally within the supply/discharge shaft is opened.