JPH02168019A - hydraulic thrust bearing - Google Patents

Abstract

PURPOSE:To make it possible to save a space and a cost required for a detection device by supporting floating plates installed on a rotational shaft free to rotate in the floating state with pressurized hydraulic fluid and providing a pressure sensor in oil chambers facing the floating plates. CONSTITUTION:Hydraulic fluid of a hydraulic pump is always supplied from a supply port 17 to oil chambers 15 while a screw shaft 1 is rotating, and accordingly, floating plates 10 are supported while floating from a wall face 8A and rotate in one body with a disk 9 which has a large contact friction force. If a thrust load increases at this time, a clearance between one side plate 10 and the wall face 8A narrows and the outflow of hydraulic oil from one oil chambers 15 to a rotation chamber 26 decreases, and accordingly, the pressure in the oil chamber 15 rises. Subsequently, in the oil chamber 15 on the opposite side, the clearance between the plate 10 and the wall face 8A increases and the pressure in the oil chamber 15 decreases accordingly. As the pressure of each oil chamber 15 thus increases and decreases until it comes to balance with the change of the thrust load, the plates 10 always keep their floating state and support the thrust load of the shaft 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydraulic thrust bearing having a function of measuring a thrust load applied to a rotating shaft.

(Prior Art) Some ships with a screw shaft directly connected to the ennon have the screw shaft supported on the hull via a thrust bearing so that the thrust load based on the thrust of the screw does not act on the engine.

In addition, if it is necessary to detect the thrust of the screw for purposes such as ship maneuvering or control of the ennon, a detection device using a moe weight meter is installed in the middle of the screw shaft, and the thrust of the screw is detected from the thrust load applied to the screw shaft. Detected.

(Problem to be solved by the invention) However, in addition to supporting the screw shaft with a thrust bearing, by interposing a load meter on the screw shaft that requires a special member such as a swamp ring, devices related to the screw shaft can be improved. There was a problem that the whole thing became complicated and the burden on space and cost increased.

SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide a hydraulic thrust bearing capable of measuring thrust loads.

(Means for Achieving the Object) The present invention includes a floating plate that rotates with a rotating shaft and is rotatably housed inside a bearing case, and oil is applied to each wall surface inside the bearing case that slides on both sides of the floating plate. A supply passage that forms a chamber and guides pressurized hydraulic oil from a hydraulic source to these oil chambers, and a discharge passage that collects hydraulic oil flowing out from the oil chamber through the gap between the floating plate and the wall into a tank. At the same time, each oil chamber is equipped with a pressure sensor to detect pressure.

(Function) The floating plate is rotatably supported in a floating state by pressurized hydraulic oil supplied to each oil chamber formed on the wall inside the bearing case. As a result, the floating plate rotates together with the rotating shaft while supporting the rotating shaft against the thrust load. At this time, the hydraulic oil flowing out from the oil chamber while lubricating the gap between the wall surface and the rotating floating plate is collected into the tank from the discharge passage.

In addition, as the thrust load increases, the gap between the floating plate and one wall gets pinched, and the pressure in the oil chamber that drains hydraulic oil from this gap increases until it balances with the thrust load. You can gain strength.

Furthermore, a pressure sensor installed in the oil chamber detects the oil pressure acting on the floating plate. The thrust load acting on the rotating shaft is calculated based on this oil pressure.

(Example) Embodiments of the present invention are shown in FIGS. 1 to 3.

In Figure 1, 1 is the ship's screw shaft;
A screw 3 is connected to one end as shown in FIG. 3, and the other end is connected to an engine 4 via a thrust bearing 2. The thrust bearing 2 and the engine 4 are supported by the hull 5 via supports 6 and 7, respectively.

The thrust bearing 2 has a disk 9 fixed to the screw shaft 1 inside a bearing case 8 through which the screw shaft 1 freely rotates through a radial bearing 18 and an oil seal 19, and a disk 9 fixed to the screw shaft 1 on both sides thereof. A disk-shaped floating plate 10 supported by a plate guide 1 is housed in a disk-shaped floating plate 10 that is freely rotatable.
1 and nut 12 restrict axial displacement with respect to the screw shaft 1. Further, the opposing side surfaces of these 70-ring plates 10 contact the inner disk 9 via freely rotatable rollers 14, and the opposite side surfaces slide against the wall surface 8A inside the bearing case 8, respectively.

An oil chamber 15 is formed in the shape of an annular groove on these wall surfaces 8A,
A supply boat 17 serving as a supply passage opens to the outside of the bearing case 8 and supplies pressurized hydraulic oil to the oil chamber 15 through the orifice 16 .

In addition, the discharge port serves as a discharge passage for the hydraulic oil that has flowed from the oil chamber 15 through the gap between the wall surface 8A and the rotating floating plate 10 and into the rotating chamber 26 of the disk 9 and floating plate 10 formed in the bearing case 8. 20 similarly opens to the outside of the bearing case 8.

As shown in FIG. 2, the supply boat 17 is connected to a hydraulic pump 23 which is a hydraulic power source, and the discharge boat 20 is connected to a tank 24.
connected to. Note that 25 is 4% of the hydraulic pump 23.
b A relief valve that releases high pressure to the tank 24.

Furthermore, each oil chamber 15 is provided with pressure sensors 21 and 22, respectively. These pressure sensors 21 and 22 are connected to an arithmetic unit or the like provided in the ship as a separate unit via an amplifier.

Next, the effect will be explained.

While the screw shaft 1 is being driven to rotate, the hydraulic pump 23
Pressurized hydraulic oil is constantly supplied from the boat 17 to the orifice 16.
The oil is supplied to the oil chamber 15 via.

After this hydraulic oil lubricates the sliding contact between the floating plate 10 and the wall surface 8A, it flows out into the working chamber 26 and returns to the tank 24 via the discharge boat 20.

Thereby, the floating plate 10 is supported in a floating state from the wall surface 8Δ, and rotates together with the disk 9 having a larger contact friction force.

By the way, when the thrust load increases, the gap between the one 70-ring plate (70-ring plate) 10 and the wall surface 8A gets pinched, and as a result, the amount of hydraulic oil flowing from the oil chamber 15 to the rotation chamber 26 decreases, and as a result, the pressure in the oil chamber 15 decreases. Rise. Also, the oil chamber 15 on the opposite side
In this case, the pressure in the oil chamber 5 decreases due to an increase in the gap between the floating plate 10 and the wall surface 8A. In this way, the pressure in each oil chamber 15 increases or decreases until it balances with the change in thrust load, and the floating plate 10
supports the thrust load of the screw shaft 1 while always maintaining a floating state.

Further, this thrust load, that is, the thrust force exerted by the screw 3 on the hull 5 can be determined from the pressure in the oil chamber 15 detected by the pressure sensors 21 and 22.

That is, the pressure detected by the pressure sensor 21 is
If the detection pressure of 2 is P2, the pressure receiving surface of the hydraulic pressure exerted by the hydraulic oil in the oil chamber 15 on the floating plate 10 is A, and the thrust load acting on the screw shaft 1 is 3F, then F = (P + P 2)X A Since the function 1 system holds true, the thrust of the screw 3 can be easily determined by performing these calculations using an arithmetic device.

The thrust of the screw 3 detected in this manner can be displayed on a display device inside the ship to aid in ship maneuvering, and can also be used for feedback control of the trim angle of the screw 3, propeller pitch, etc.

By the way, due to a failure of the hydraulic pump 23, the oil chamber 15
When the supply of pressurized hydraulic oil to is stopped, the floating plate 10 on the side supporting the thrust load comes into direct contact with the wall surface 8A due to the thrust load, and its rotation is restricted.

At this point, floating plate 1 that has stopped rotating
By rotating the disk 9 relative to the screw shaft 1 while rolling the roller 14, the rotation of the screw shaft 1 and support in the thrust direction are ensured. Therefore, even if the hydraulic bomb 23 should stop, there is no risk that the shaft 1 or the disk 9 will seize or become galled.

(Effects of the Invention) As described above, the present invention allows a floating plate to be freely rotated on a rotating shaft, supports this floating plate in a floating state with pressurized hydraulic oil, and applies pressure to an oil chamber facing the floating plate. Since the sensor is installed, the thrust load acting on the rotating shaft can be hydraulically supported, and the magnitude of the thrust load can be easily detected inside the thrust bearing.

Therefore, the reliability of the thrust bearing is improved, and most of the space and cost required for providing a thrust load detection device can be saved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a thrust bearing showing an embodiment of the present invention, Fig. 2 is a hydraulic circuit diagram showing the connection relationship between the thrust bearing, a hydraulic pump, and a tank, and Fig. 3 shows the interposition position of the thrust bearing. It is a sectional view of the rear part of the ship shown in FIG. 1... Screw shaft, 2... Thrust bearing, 8... Bearing case, 8A... Wall surface, 9
... Disc, 10... Floating plate,
15.Oil chamber, 17.. Supply port, 20.. Discharge port, 21.22..- Pressure sensor, 23.. Hydraulic pump, 2.1.. Tank. 1. Applicant: Kayabae Gyo Co., Ltd. 2. Figure 3. Procedural amendment March 13, 1989 1. Indication of the incident Patent Application No. 322942 of 1988 2. Name of the invention Hydraulic thrust load detector 3. Relationship with the case of the person making the amendment Patent applicant address 2-4-1 Hamamatsucho, Minato-ku, Tokyo World Trade Center Building name (092) Kayabae Gyo Co., Ltd. 4゜

Claims (1)

[Claims] A floating plate that rotates with the rotating shaft is rotatably housed inside the bearing case, and an oil chamber is formed on each wall surface of the bearing case that slides on both sides of the floating plate, and pressurized hydraulic oil is supplied from the hydraulic source. It is equipped with a supply passage that leads the oil to these oil chambers, and a discharge passage that collects the hydraulic oil flowing out from the oil chamber through the gap between the floating plate and the wall surface into the tank, and a pressure sensor that detects the pressure in each oil chamber. A hydraulic thrust bearing characterized by being equipped with.