JPH0538320Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a device for supplying oil to an oil passage along the central axis of a rotating shaft, and in particular, to a device for supplying oil to an inner shaft bearing in a shaft system of a counter-rotating propeller. The present invention relates to a rotary shaft oil supply device suitable for use in.

[Conventional technology] Conventionally, as a device for lubricating a rotating shaft,
There is one as shown in Fig. 4, which has a rotary joint type structure as a whole.

That is, the main body 01 is provided with an inlet pipe 04 connected to the pipe from the oil supply source, and the inlet pipe 04
communicates with the sleeve 02A of the sleeve assembly 02 which can rotate relative to the main body 01 via a bearing 06.

The male thread at the tip of the sleeve 02A is screwed into a female thread at the oil passage entrance at the end of the rotating shaft (not shown).

Note that the reference numeral 03 in FIG. 4 indicates a floating seat 03 loaded into the main body 01 via a spring 05, and the floating seat 03 is attached to the sleeve insert 02B assembled into the sleeve assembly 02. In contrast, it slides while being pressed by a spring 05, thereby sealing the flow of oil supply.

[Problem that the invention attempts to solve]

However, the conventional rotary
In the joint type rotary shaft oil supply device, it is necessary to connect the sleeve 02A to the end face of the rotary shaft, and the rotary shaft is directly connected to the output shaft of the engine, like the inner shaft in the shaft system of a marine counter-rotating propeller. In such a case, since the end face of the rotating shaft is not exposed, there is a problem that the oil supply device cannot be connected.

In addition, in the case of marine propulsion shafts, the rotating shaft is constantly vibrating due to the excitation torque from the main engine and propeller, so in the conventional rotary joint type rotary shaft oiling device, the main body 01 is attached to the ship body with a buffer mechanism. There is a problem in that the structure becomes complicated because it is necessary to support the oil supply through a fuel tank or to connect the inlet 04 to an oil supply source through a flexible pipe such as a pressure-resistant hose.

The present invention attempts to solve the above-mentioned problems by making it possible to supply oil to the oil passage inside the rotating shaft through an oil chamber in a housing that covers the outer peripheral surface of the rotating shaft. For rotating shafts, it is possible to simplify oil supply to the rotating shaft, and the housing has a half-split floating structure to realize a long-life bearing and to simplify maintenance and inspection. The purpose is to provide a refueling device.

[Means for solving problems]

Therefore, the rotary shaft oil supply device of the present invention has a rotary shaft having an oil passage along the central axis and oil supply holes branching radially from the oil passage, and a rotary shaft that relatively slides along the outer circumferential surface of the rotary shaft. A housing having a semi-split type floating structure having two rows of movable bearing members and an oil chamber formed between the same bearing members and communicating with the oil supply hole, and communicating with the oil chamber. an oil supply port formed in the housing, and a leakage port formed on the outside of each of the two rows of bearing members adjacent to the oil chamber in the housing to receive leakage oil from the oil chamber via the bearing member. An oil chamber and a sealing mechanism disposed between the outer circumferential surface of the rotating shaft on the outside of the leakage oil chamber are provided, and waste oil is recovered from the leakage oil chamber and returned to the lubricating oil supply system. The housing is characterized by an oil drain port formed in the housing.

[Effect]

In the rotary shaft oil supply device of the present invention described above, the housing arranged along the outer peripheral surface of the rotary shaft has a floating structure via the two rows of bearing members.
The rotary shaft is allowed to rotate, and lubricating oil is supplied from the outside to the oil chamber in the housing through the oil supply port of the housing. Furthermore, the lubricating oil supplied to the oil chamber is passed through the oil supply hole in the rotating shaft.
The oil is guided to the oil passage within the rotating shaft.

Lubricant oil leaking between the rotating shaft and the bearing member is guided to a leakage oil chamber in the housing and is discharged through an oil drain port formed in the housing. At this time, the lubricating oil introduced into the leaking oil chamber is prevented from leaking to the outside by a sealing mechanism disposed between the outer peripheral surface of the rotating shaft and the outer peripheral surface of the rotating shaft on the outside of the leaking oil chamber.

〔Example〕

Hereinafter, a rotary shaft oiling device as an embodiment of the present invention will be explained with reference to the drawings. Figures 1 to 3 show the case where the device of the present invention is applied to a counter-rotating propeller shaft system; 2 is a longitudinal cross-sectional view taken along the arrow line in Figure 2, Figure 2 is a cross-sectional view taken along the arrow line in Figure 1, and Figure 3 shows the entire contra-rotating propeller shaft system equipped with this device. FIG.

As shown in FIGS. 1 and 2, the inner shaft 22 as the rotating shaft in the counter-rotating propeller shaft system has an oil passage 19 along its central axis and oil supply holes 20 that branch out radially from the oil passage. Around the inner shaft 22, there is provided a housing A having a half-split type floating structure consisting of a lower housing 1 and an upper housing 2.

In other words, the housing A is horizontally 2
Divided lower housing 1 and upper housing 2
are firmly assembled using reamer bolts 10, jack bolts 11, and mounting bolts 12.

The housing A has a pair of bearing metals 3, 3 as two rows of bearing members that can relatively slide along the outer peripheral surface of the inner shaft 22, and each bearing metal 3 also has a half-split structure. It is curved to ensure its roundness.

Inside the housing A, there are a pair of bearing metals 3, 3.
An oil chamber 23 is formed between the two, and the oil chamber 23 communicates with the oil supply hole 20 in the inner shaft 22. Lubricating oil is supplied to the oil chamber 23 through an oil supply port 16 formed in the housing A.

Further, inside the housing A, on the outside of each of the pair of bearing metals 3, there is a leakage oil chamber 24 adjacent to the oil chamber 23 into which lubricating oil leaked from the oil chamber 23 via the bearing metal 3 can be introduced. It is formed.

As a seal mechanism B disposed between the outer side of each leakage oil chamber 24 and the inner shaft 22, there is a buffle plate 6 protruding inside the housing A, and a check ring protruding from the outer peripheral surface of the inner shaft 22. 5, and the check ring 5 is arranged close to the side cover 4 of the housing A.

Note that the side cover 4 is attached to the housing A via bolts 13.

Furthermore, the housing A is provided with an oil drain port 17 for collecting drained oil from the leaking oil chamber 24 and returning it to the lubricating oil supply system as described later, and a gap between the buttful plate 6 and the inner shaft 22. An auxiliary oil drain port 18 is also provided for discharging leaked oil that has passed through.

The lower housing 1 of the housing A has a main body side holder 7 attached to the bottom center thereof with mounting bolts 14. It is connected to the holder 8 by a pin 9,
This prevents the housing A from moving in the axial direction.

However, the housing A has a floating structure that allows some movement within the vertical plane, and as a means for this purpose, the hole through which the pin 9 is inserted may be formed as an elongated hole, or both the holders 7,
8, a rubber plate is interposed between each other.

In this way, the housing A can follow the vibrations and inclinations of the inner shaft 22.

Oil is supplied to the oil chamber 23 through the oil filler port 16 in the housing A;
As shown in Figure 3, there is a retractable hose 4.
0 is connected, and the hose 40 is connected to an external oil supply source a.

On the other hand, the front end of the inner shaft 22 is connected to the output shaft 31 of the main engine 30 so that the central axes thereof coincide, and a rear propeller 37 is provided at the rear end of the inner shaft 22.

Further, a cylindrical outer shaft 35 having a front propeller 36 at its rear end is provided around the inner shaft 22, and the front end of the outer shaft 35 is configured to rotate the outer shaft 35 in a direction opposite to that of the inner shaft 22. It is connected to the front end of the inner shaft 22 via a reversing device 34 and an elastic joint 33 for rotation.

An annular inner shaft bearing 38 is fixed to the inner peripheral surface near the rear end of the outer shaft 35.
8 supports the inner shaft 22.

Further, a plurality of oil supply holes 39 branching from the oil passage 19 at right angles are drilled in the inner shaft 22 so that lubricating oil can be supplied to the surface of the inner shaft 22 in contact with the inner shaft bearing 38.

Since the rotary shaft oil supply device as an embodiment of the present invention is constructed as described above, the lubricating oil supplied to the oil chamber 23 through the oil supply port 16 is transferred to the inner shaft 22.
The oil is supplied to the oil passage 19 through oil supply holes 20 provided radially from the oil.

The housing A of this device has a floating structure that holds the inner shaft 22, thereby stabilizing the gap between the bearing metal 3 and the inner shaft 22, and
Since the housing A can follow the vibration and inclination of the inner shaft 22, the amount of leaked oil leaking from the oil chamber 23 to the leaking oil chamber 24 through the above-mentioned gap becomes extremely small.
Furthermore, the leaked oil is leaked between the full plate 6 and the inner shaft 22.
and between the side cover 4 and the check ring 5.
The leaked oil is sealed between the
8 and used again in the lubricating oil supply system.

On the other hand, the lubricating oil supplied to the oil passage 19 is supplied to the contact surface between the inner shaft 22 and the inner shaft bearing 38 via the oil supply hole 39.

In this way, the oil passage 19 inside the inner shaft 22
The rotational shaft oiling device is provided with a housing A having a floating structure that holds the inner shaft 22 through the bearing metal 3.
It becomes possible to connect the inner shaft 22 directly to the main engine 30, which simplifies the structure of the shaft system and its lubrication system, and also stabilizes the gap between the bearing metal 3 due to the ability of the housing A to follow the inner shaft 22. This prevents uneven contact and reduces leakage oil, and the leakage oil constantly lubricates the bearing metal 3 from the oil chamber 23, reaches the leakage oil chamber 24, and is drained from the leakage oil chamber 24. It is recovered through the oil port 17 and used again in the lubricating oil supply system. In addition, since housing A has a half-split structure,
Another advantage is that maintenance and inspection are easier.

[Effect of idea]

As detailed above, according to the rotary shaft oil supply device of the present invention, the rotary shaft has an oil passage along the central axis and oil supply holes branching radially from the oil passage;
A semi-split type floating structure having two rows of bearing members that can relatively slide along the outer peripheral surface of the rotating shaft and an oil chamber formed between the bearing members and communicating with the oil supply hole. a housing, and an oil filler port formed in the housing so as to communicate with the oil chamber, and the oil filler port formed on the outer side of each of the two rows of bearing members adjacent to the oil chamber in the housing. It has a simple structure that includes a leaking oil chamber that receives leaked oil from the oil chamber via the bearing member, and a sealing mechanism disposed between the outer peripheral surface of the rotating shaft and the outside of the leaking oil chamber. , it becomes possible to equip the shaft system without occupying the end of the rotating shaft.

In addition, since the housing has a floating structure that holds the rotating shaft, it can cope with vibrations of the rotating shaft, resulting in extremely high structural reliability. The lubricating oil that constantly flows into the leakage oil chamber through the bearing member significantly extends the life of the bearing, and the clearance between the bearing member and the rotating shaft is stabilized, reducing leakage oil, which improves lubrication efficiency. This results in improved performance.

[Brief explanation of the drawing]

Figures 1 to 3 show a case in which a rotating shaft oiling device as an embodiment of the present invention is applied to a counter-rotating propeller shaft system, and Figure 1 is a longitudinal section taken along the - arrow line in Figure 2. 2 is a cross-sectional view taken along the − arrow line in FIG. 1, and FIG. 3 is a longitudinal sectional view showing the entire counter-rotating propeller shaft system equipped with this device.
FIG. 4 is a longitudinal sectional view showing a conventional rotary shaft oil supply device. 1...Lower housing, 2...Upper housing, 3...Bearing metal as a bearing member, 4...
Side cover, 5... Check ring, 6... Buttful plate, 7... Body side holder, 8...
Support side holder, 9... pin, 10... reamer bolt, 11... jack bolt, 12-15...
Mounting bolt, 16...Oil filler port, 17...Oil drain port,
18... Auxiliary oil drain port, 19... Oil passage, 20...
Oil supply hole, 21...Support stand, 22...Inner shaft as rotating shaft, 23...Oil chamber, 24...Leak oil chamber, 30
...Main engine, 31...Main engine output shaft, 33...
Elastic joint, 34... Reversing machine, 35... Outer shaft, 36
...Forward propeller, 37...Backward propeller, 38
... Inner shaft bearing, 39 ... Oil supply hole, 40 ... Hose, A ... Housing, a ... Oil supply source, B ... Seal mechanism.

Claims (1)

[Scope of utility model registration request] A rotating shaft having an oil passage along a central axis and an oil supply hole branching radially from the oil passage, and two rows of bearing members that can relatively slide along the outer peripheral surface of the rotating shaft. a housing having a semi-split type floating structure having an oil chamber formed therebetween and communicating with the oil supply hole, and an oil supply port formed in the housing so as to communicate with the oil chamber; A leakage oil chamber is formed on the outside of each of the two rows of bearing members adjacent to the oil chamber in the housing and receives leaked oil from the oil chamber via the bearing member, and A sealing mechanism disposed between the housing and the outer peripheral surface of the rotating shaft is provided, and an oil drain port is formed in the housing for collecting drained oil from the leaking oil chamber and returning it to the lubricating oil supply system. A rotating shaft oil supply device characterized by the following.