JPH09144855A - Gearing for high-speed rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply assemble and disassemble a grar shurounding device, and also restrain the increase of gear stirring loss. SOLUTION: A gear shrounding device 10 to be fitted into a gear casing 1 is made into two-piece constitution of an upper shuroud 11 to be fitted to an upper casing 2 from an outer side, and of a lower shuroud 12 to be fitted to a lower casing 3 from an outer side and an upper matching surface part. When a large diameter spindle part, having a diameter equal to or larger than the inner diameter of a spindle through hole, formed of the shourouds 11 and 12, is provided between the bearing Bg of a rotating spindle and the shrounding device 10, the mounting/dismounting of the shrounding device 10 can be simply made, and a cooling oil blown off from the bearing Bg is interrupted by the large diameter spindle part, to reduce cooling oil quantity, passing through between the spindle through hole and the rotating spindle to be infiltrated into the shrouding device 10, thereby the increase of gear stirring loss can be restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an upper and lower split type gear enclosure which is particularly easy to assemble and disassemble, and is capable of suppressing an increase in gear agitation power loss and wind power loss. It belongs to the technical field of gears for high-speed rotating machines.

[0002]

2. Description of the Related Art A high speed rotating machine such as a turbo compressor is rotated at a high speed by a gear device having a plurality of gears meshing with each other. By the way, the power loss of the gear train of the gear device includes gear stirring power loss due to stirring of cooling oil (also serving as lubrication) between gears meshing with each other in the gear train and generation of wind due to rotation of gears in the gear train. There is wind power loss due to. Gear agitation power loss and wind power loss (which is said to increase in proportion to the cube of the gear speed) gradually increase as the rotation speed of the gear increases,
It cannot be ignored. Therefore, in order to prevent such a reduction in mechanical efficiency of the gear device, it is necessary to suppress an increase in gear agitation power loss and wind power loss.

As is well known, the amount of cooling oil is sufficient if it can cool the gear to a predetermined temperature.
Cooling oil in the oil pan at the bottom of the gear casing and the cooling oil after cooling from the bearing sprayed from the bearing of the rotating shaft that rotatably supports the gear (usually a pad type journal bearing) are applied to the gear. Since more cooling oil adheres to the gear than necessary, a means for suppressing the amount of cooling oil adhering to the gear is adopted in order to suppress gear stirring power loss. When the amount of cooling oil is large, the amount of mist of cooling oil scattered by centrifugal force increases, and as a result, wind power loss also increases.

A means for suppressing the amount of cooling oil adhering to the gear is disclosed in, for example, Japanese Patent Application Laid-Open No. 4-503558. Hereinafter, the cooling oil amount suppressing means will be described with reference to FIG. 9A which is a partial side view of the gear device and FIG. 9B which is a partial sectional configuration explanatory view of the gear device. In the gear casing, the gear casing 51 is the rotating shaft 5
It is configured so that it can be divided into two in the longitudinal direction.

The gear 53, which is formed integrally with the rotary shaft 52, is located at the portion through which the rotary shaft 52 passes.
It is surrounded by a shroud plate system 54 (gear shroud device) including shroud plates 55 and 56 having shaft through holes 55a and 56a having an inner diameter larger than the outer diameter of the shank. Therefore, the cooling oil ejected from the bearing Bg is blocked by the shroud system 54. On the other hand, when inspecting and servicing the gears of the gear device, the enclosure plate system 54 is disassembled by disassembling the gear casing 51 in the longitudinal direction of the rotary shaft 52, and the enclosure plate system 54 is disassembled after the inspection and maintenance are completed. Is assembled to the casing, and the gear casing 51 is assembled.

[0006]

The enclosure plate system of the gear device according to the above-mentioned conventional example is useful because it can contribute to reduction of gear stirring power loss of the gear train. However, in the case of the parallel type gear device and the gear casing is of the upper and lower split type, it is difficult to disassemble and assemble the enclosure plate system having the above-mentioned configuration, and the enclosure plate that constitutes the enclosure plate system is provided with the gear casing. Since the cooling oil ejected from the bearing enters the gap between the shaft through hole through which the rotating shaft passes and the rotating shaft, the amount of cooling oil cannot always be suppressed sufficiently,
There is a problem to be solved that the reduction effect of gear stirring power loss is small.

Therefore, the present invention is provided with a gear shroud device which can be easily assembled and disassembled, and a high-speed rotation which is composed of a vertically-separated type gear casing which makes it possible to more effectively block the cooling oil ejected from the bearing. The purpose is to provide a gear device for a machine.

[0008]

In order to solve the above-mentioned problems, the means adopted by the gear device for a high speed rotating machine according to claim 1 of the present invention is a combination of the lower casing and the upper casing of the gear casing. , A plurality of rotating shafts are supported through bearings that are forcibly cooled by the supply of cooling oil, and a plurality of gears meshing with each other are supported by the plurality of rotating shafts so as to be located in the gear casing, and In a high-speed rotating machine gear device in which a gear train composed of a plurality of gears is surrounded by a gear shroud plate device, the gear shroud plate device is a lower shroud plate secured from the outer side of the lower casing and an upper mating surface portion. And an upper shroud secured to the outside of the upper casing, and a shaft formed by the upper and lower shrouds between the upper and lower shrouds of the rotating shaft and the bearing. Wherein the than the inner diameter of the through hole is provided a large-diameter shaft portion of larger diameter.

The means adopted by the high speed rotating machine gear device according to claim 2 of the present invention is the high speed rotating machine gear device according to claim 1, wherein the upper shroud has an outer peripheral portion of a plurality of gears. An upper gear outer peripheral cover having a circular curved surface corresponding to, and a lower gear outer peripheral cover having a circular curved surface corresponding to the outer peripheral portions of the plurality of gears and having a lower opening fixed to the lower shroud. Characterize.

The means adopted by the gear device for a high speed rotating machine according to claim 3 of the present invention is the gear device for a high speed rotating machine according to claim 1 or 2, wherein the upper and lower shroud plates are formed. The upper and lower small enclosing plates that form shaft holes having a diameter smaller than the inner diameters of the shaft through holes are fixed to the shaft through holes.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a gear device for a high speed rotating machine according to Embodiment 1 of the present invention will be described with reference to FIG. 1 of the drawing, FIG. 3 of the sectional view taken along the line BB of FIG. 1, FIG. 4 of the sectional view taken along the line of CC of FIG. 1, FIG. 5 of the sectional view taken along the line of D-D of FIG. EE
This will be described with reference to FIG. 6 which is a sectional view taken along the line. However, since the structure of the surrounding plates disposed on the inner sides of the rotation axis of the gear casing in the longitudinal direction is the same, only one side will be described.

First, an outline of a gear device for a high-speed rotating machine (hereinafter referred to as a gear device) will be described with reference to FIG.
The gear casing 1 of the gear device includes a lower casing 3 and
The upper casing 2 is mounted and assembled on this, and the three mating rotary shafts 4, 5 and 6 described below are respectively provided with bearings on the horizontal mating surface portion so that the rotary shaft centers are on the same plane. Are supported by the left and right rotary shafts 4, 6
Small gears 7 and 9 are attached to the shafts (both are driven shafts, and, for example, a turbo compressor is connected to the shaft ends).
The (drive shaft) has a large gear 8 meshing with these small gears 7 and 9.
Is supported. A gear shroud device 10 including a lower shroud plate 12 and an upper shroud plate 11 is mounted inside the gear casing 1 of this gear device. The lower enclosure plate 12 and the upper enclosure plate 11 are detachably attached to the lower casing 3 and the upper casing 2, respectively, by attaching means described later.

More specifically, as shown in FIGS. 2 to 4, the lower shroud 12 is provided with a hexagon socket head cap screw B ₁ mounted from the outside of the lower casing 3 so as to protrude from the lower shroud 12. The lower casing 3 is screwed to the female screw of the block 12a and is protruded from the upper end side surface of the lower enclosure plate 12.
Countersunk screw B _{2 which} is passed through the conical hole of the block 12b with a hole fitted in the notch 3a provided at the upper inner corner of the above is screwed to a female screw formed by screwing on the bottom surface of the notch 3a. Therefore, it is attached to the lower casing 3. As shown in FIG. 3, the upper shroud 11 is formed by screwing a hexagon socket head cap screw B ₁ attached from the outside of the upper casing 2 onto a female screw threaded on the upper shroud 11. It is attached to the upper casing 2.

Therefore, when the upper casing 2 is fitted onto the lower casing 3, the lower end surface of the upper enclosure plate 11 and the upper end surface of the lower enclosure plate 12 face each other with a slight gap, and it is as if one enclosure plate. Then, three shaft through holes 13 through which the three rotary shafts 4, 5 and 6 respectively pass are formed in the mating portion of the upper and lower shrouds 11 and 12.

Next, the shapes of the rotary shafts 4, 5 and 6 will be described with reference to FIGS. That is, FIG. 2 shows the shape of the rotary shaft 4 on the left side in FIG. 1, and FIG.
6 shows the shape of the rotary shaft 6 on the right side, the outer diameter between the gear shroud device 10 and the bearing Bg is not limited to any of these rotary shafts 4, 5 and 6. Is the shaft through hole 1
A large-diameter large-diameter shaft portion 4a having a diameter equal to or larger than the inner diameter of 3,
5a and 6a are provided. These large diameter shaft portions 4a, 5
Reference characters a and 6a have a function of blocking the cooling oil jetted from each bearing Bg along the rotation axis and scattering the blocked cooling oil outward from the outer edge portion thereof.

The mode of operation of the gear device according to the first embodiment will be described below. The gear shroud plate device 10 is formed into an upper shroud plate 11 and a lower shroud plate 12 by simply removing the upper casing 2 from the lower casing 3. Parting, each gear 7,8,9
Since it is exposed, inspection and maintenance can be performed easily.
Further, since the lower enclosure plate 12 is attached from the outside of the lower casing 3 and the upper mating surface portion, and the upper enclosure plate 11 is attached from the outside of the upper casing 2, the upper and lower enclosure plates 11, The 12 can be attached and detached extremely easily.

Regarding the gear agitation power loss, the large-diameter shaft portions 4a, 5 are provided to the respective rotary shafts 4, 5, 6.
a and 6a are provided to block the cooling oil jetted from the bearings Bg along the rotation axis and to scatter the blocked cooling oil outward from the outer edge portion thereof. The cooling oil does not enter from between the rotating shaft and the rotating shaft, and the cooling oil that adheres to the large gear is only the cooling oil in the oil pan portion at the bottom of the gear casing 1. Therefore, an increase in gear stirring power loss is suppressed. It Further, regarding the wind power loss, the cooling oil ejected from the bearing Bg is, as described above, the large-diameter shaft portion 4
Although it scatters outward from the outer edge portions of a, 5a, and 6a, the mist of the cooling oil does not easily enter the inside of the gear shroud plate device 10, so that the increase in wind power loss is suppressed to some extent.

Next, a gear device according to a second embodiment of the present invention will be described below with reference to FIG. 7 which is a structural explanatory view of a gear shroud device, and only points different from the first embodiment. , Between the pair of upper shrouds 11 attached to the upper casing 2 from the outside, it is molded into a shape having a large circular portion enclosing the upper half of the large gear and a small circular portion enclosing four halves of the left and right small gears. The upper gear outer peripheral cover 14 formed of the above is interposed to be integrally configured. Also,
An opening 15a is formed on the lower side between a pair of lower shroud plates 12 attached to the lower casing 3 from the outside and the upper mating surface side, and a large circular portion enclosing one portion of the large gear and a small gear. A pair of lower gear outer peripheral covers 15, 15 formed in a shape having a small circle portion that surrounds four halves is interposed to integrally configure.

Therefore, by simply removing the upper casing 2 from the lower casing 3, the gear shroud device 10 includes an upper shroud plate 11 having an upper gear outer circumference cover 14 and a lower shroud plate 12 having lower gear outer circumference covers 15 and 15. Goodbye to
Since each gear is exposed, the upper and lower enclosure plates 11 and 12 can be attached and detached very easily, and the cooling oil ejected from the bearing is prevented from entering between the shaft through hole and the rotary shaft.
This embodiment has the same effect as the above-mentioned first embodiment. In addition,
The cooling oil adhering to the large gear is scattered by the centrifugal force caused by the high speed rotation of the large gear, but flows down through the upper gear outer peripheral cover 14 and the lower gear outer peripheral covers 15 and 15 to open the opening 1
Drop from 5a.

Next, a gear device according to a third embodiment of the present invention will be described below with reference to FIG. 8 which is a sectional structural explanatory view of the gear shroud device, and is only different from the first or second embodiment. Explaining to, the upper and lower small enclosure plates 16 and 17 in which the axial through holes 13 formed by the upper and lower enclosure plates 11 and 12 are formed with the axial holes 18 having a diameter smaller than the inner diameter of these axial through holes 11. It is configured by fixing.

Therefore, the rotary shaft and the upper and lower small enclosure plates 16,
The gap between the shaft hole 18 formed by 17 and the shaft hole 18 is narrower than that in the above-described embodiment, and the intrusion of the cooling oil into the gear shroud device 10 is further reduced. Compared with No. 2, the effect can be exerted by preventing increase in gear stirring power loss and wind power loss.

In the above embodiments, the case where all the gear devices are parallel gear devices has been described, but the technical idea of providing a large-diameter shaft portion on the rotary shaft to block the cooling oil ejected from the bearings. Can be applied not only to the rotary shaft of the gear device according to the conventional example, but also to the rotary shaft of various types of gear devices of this type.

[0023]

As described above, the gear device according to the first to third aspects of the present invention is a parallel gear device, but the upper shroud of the gear shroud device is mounted from the outside of the upper casing. The lower shroud is attached from the outside of the lower casing and the upper mating surface side,
The gear is exposed only by removing the upper casing,
Since the gear shroud device can be easily disassembled and assembled, it has the effect of facilitating the inspection and maintenance work of the gear device. Furthermore, the existence of the large-diameter shaft part provided on the rotating shaft allows the gear of the cooling oil injected from the bearing Since the invasion into the shroud device is prevented and the increase in gear agitation power loss and wind power loss is suppressed, there is a great effect in reducing the mechanical loss of the gear device.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a state in which a cover plate of a gear device according to a first embodiment of the present invention is provided.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along line CC of FIG. 1;

FIG. 5 is a sectional view taken along line DD of FIG. 1;

FIG. 6 is a sectional view taken along line EE of FIG. 1;

FIG. 7 is a configuration explanatory diagram of a gear shroud device of a gear device according to a second embodiment of the present invention.

FIG. 8 is a sectional configuration explanatory diagram of a gear shroud device of a gear device according to a third embodiment of the present invention.

9A and 9B relate to a conventional example, FIG. 9A is a partial side view of a gear device, and FIG. 9B is a partial cross-sectional configuration explanatory diagram of the gear device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Gear casing, 2 ... Upper casing, 3 ... Lower casing, 3a ... Notch, 4 ... Rotating shaft, 4a ... Large diameter shaft part, 5 ... Rotating shaft, 5a ... Large diameter shaft part, 6 ... Rotating shaft, 6a …
Large-diameter shaft portion, 7 ... Small gear, 8 ... Large gear, 9 ... Small gear, 10
... gear shroud device, 11 ... upper shroud, 12 ... lower shroud, 12a ... screw block, 12b ... holed block, 1
3 ... Shaft through hole, 14 ... Upper gear outer peripheral cover, 15 ... Lower gear outer peripheral cover, 15a ... Opening, 16 ... Upper small shroud,
17 ... Lower shroud, 18 ... Shaft hole.

Claims (3)

[Claims] 1. A plurality of rotating shafts are supported at a mating portion of a lower casing and an upper casing of a gear casing via bearings which are forcibly cooled by supplying cooling oil, and these rotating shafts mesh with each other. A plurality of gears are supported so as to be located in the gear casing, and a gear train for a high-speed rotating machine in which a gear train composed of these plurality of gears is surrounded by a gear shroud device, wherein the gear shroud device is A lower shroud fixed to the outer surface of the lower casing and the upper mating surface, and an upper shroud fixed to the outer surface of the upper casing, and upper and lower shrouds for the rotating shaft and a bearing. A gear unit for a high-speed rotating machine, characterized in that a large-diameter shaft portion having a diameter larger than the inner diameter of the shaft through hole formed by the upper and lower enclosing plates is provided between the two. 2. An upper gear outer peripheral cover having circular curved surfaces corresponding to the outer peripheral portions of a plurality of gears is fixed to the upper enclosure plate, and a circular curved surface corresponding to outer peripheral portions of the plurality of gears is attached to the lower enclosure plate. The high-speed rotating machine gear device according to claim 1, further comprising: 3. An upper / lower small enclosure plate for forming an axial hole having a diameter smaller than an inner diameter of the shaft through hole is fixed to a portion of the axial through hole formed by the upper and lower enclosure plates. The high-speed rotating machine type gear device according to claim 1 or 2.