JPH058031U - Tapered land type thrust bearing structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a thrust bearing for a supercharger for a ship that can extend the bearing life without sacrificing practical performance by adopting a structure that meets the conditions actually used in a ship. It is in. A taper portion of the thrust bearing metal is formed as a taper portion having a plurality of gradients, and the taper portion is formed so that the gradient becomes larger as it gets closer to the oil supply groove.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tapered land type thrust bearing structure for a rotary machine.

[0002]

[Prior Art]

 As shown in FIG. 4, a conventional taper land type thrust bearing 11 includes a flat portion 3, a taper portion 2 having a very gentle slope, an oil supply hole 10 for supplying oil to the taper portion, and an oil supply groove 1. ing. The tapered portion has a small gradient so that it can withstand a high load in order to sufficiently generate the oil film pressure. 2 is the thrust color.

[0003]

[Problems to be solved by the device]

 However, if the taper portion has a small gradient as in the conventional type, when the thrust bearing metal is worn, the taper portion 4 becomes extremely small as shown in FIG. The load capacity of the bearing is reduced due to the reduction of the taper portion 4, but this is because the clearance H ′ between the thrust collar 2 and the end of the taper portion is reduced, and the amount of oil flowing into the taper portion 7 is reduced, so that the oil film is not sufficiently formed. Because of that. That is, the conventional taper land type thrust bearing has a problem that the higher the load capacity is, the shorter the life becomes. On the other hand, taper land type bearings used for turbochargers of marine diesel engines generally require a high load only at 100% output during trial operation, and usually 75 to 90% output after operation. It is normally operated in the air and the load on the bearing is reduced.

An object of the present invention is to provide a thrust bearing for a marine turbocharger, which solves the problems of the conventional device and can extend the life of the thrust bearing by having a structure adapted to the conditions actually used in the marine vessel. There is

[0005]

[Means for Solving the Problems]

 The taper land type thrust bearing structure of the present invention is used for a supercharger of a marine diesel engine, etc., and the inclination of the taper portion is made larger near the oil supply groove 1 than on the flat portion 3 side. This gradient change can be changed stepwise (Fig. 1) or continuously (Fig. 2).

[0006]

[Action]

 Since the metal of the thrust bearing 11 of the present invention has a large taper gradient near the oil supply groove 1, oil flows out from the oil supply groove 1 to the taper portions 4 and 5 even when the thrust bearing 11 is worn. The area of the portion H sandwiched between the tapered portion 5 and the thrust collar 2 is sufficiently secured, and the service life of the thrust bearing can be greatly extended without insufficient shortage of oil supply to the tapered portion.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a thrust bearing view of the first embodiment, FIG. 2 is a thrust bearing view of the second embodiment, and FIG. 3 is an operation explanatory view of the first and second embodiments. The first embodiment of the thrust bearing shown in FIG. 1 comprises a taper portion for receiving thrust, an oil supply hole 10 for supplying lubricating oil to the taper portion, and an oil supply groove 1. The taper portion is composed of a small taper portion 4 having a small slope on the flat portion 3 side and a large taper portion 5 having a large slope on the oil supply groove 1 side.

Next, the operation of the above embodiment will be described. Since the metal of the thrust bearing 11 of the present invention has a large taper portion (large gradient) near the lubrication groove 1, even if the thrust bearing 11 is worn, the lubrication groove 1 moves to the tapered portions 4 and 5. It is possible to secure a sufficient area of the portion sandwiched between the tapered portion where the oil flows out and the thrust collar 2. A 100% output is added to a main engine for ships and diesels only for a short time during test operation, and the engine load is usually operated at 75 to 90% output after the ship is in service. The load of the bearings used is high during the test run, but relatively low after the start of service.

Therefore, if the taper portion of the taper land type thrust bearing is configured as in the present invention, it is possible to withstand a high load at the time of test operation and to extend the life of the bearing after in service. In the second embodiment of FIG. 2, the tapered portion of the thrust bearing metal is composed of a small taper portion 4 on the flat portion 3 side with a small gradient and a curved surface portion 6 on the lubrication groove 1 side, and this curved surface is close to the lubrication groove 1. Although the gradient is moderately large, the function and effect are exactly the same as those in the first embodiment.

[0010]

[Effect of the device]

 A high load is applied to the thrust bearing during the trial run at 100% output, which is applied to the conventional thrust bearing. This can be received by the tapered portion with a small gradient similar to the conventional thrust bearing. On the other hand, the foreign matter in the lubricating oil after the voyage gradually wears the thrust bearing metal, as shown in the lower part of Fig. 3. However, in the thrust bearing metal according to the present invention, the taper slope becomes larger on the oil groove side. Therefore, even after the wear, the height of the clearance H'where the oil flows out from the oil supply groove 1 to the taper portion is secured, so that the shortage of oil supply to the taper portion unlike the conventional type does not occur.

Further, after the thrust bearing is worn, the taper portion with a large slope receives thrust, but in the main engine of a ship, the output during service is 75 to 90%, so it was designed in consideration of the maximum load. Even if the tapered portion with a small gradient wears, the tapered portion with a large gradient can receive thrust force practically enough, and there is no problem, and a thrust bearing with a long life can be provided.

[Brief description of drawings]

FIG. 1 is a diagram of a thrust bearing according to a first embodiment of the present invention.

FIG. 2 is a thrust bearing diagram according to a second embodiment of the present invention.

FIG. 3 is a situation diagram of the thrust bearing according to the present invention when worn.

FIG. 4 is a conventional example of FIG. 1.

FIG. 5: FIG. 3 corresponding diagram of the conventional example

[Explanation of symbols]

1 ... Refueling groove, 2 ... Thrust collar, 3 ... Flat part, 4
… Small taper (small gradient), 5… Large taper (large gradient),
6 ... Curved surface part.

Claims (1)

[Claims for utility model registration] [Claim 1] In a taper land type thrust bearing,
A taper land type thrust bearing structure characterized in that the taper portion of the thrust bearing metal is formed as a taper portion having a plurality of gradients, and the taper portion is formed so that the gradient becomes larger as it gets closer to the oil supply groove.