Accessory drive
DESCRIPTION
HW GUNBERG April 12 1960 Filed accessory drive 1'7 August 1956 2 Material leaves l [ OR IN TOR PAH / P ) M. GUNBERG A TTO / PNEY April 12, 1960 HW GUNBERG ACCESSORIES DRIVE 2 Sheets - 2 Sheet Filed August 17, 1956 ATTORNEY running.
Patent rates UNIT ACCESSORIES Harry W. Gunberg , West Hartford , Conn., assignor to United Aircraft Corporation , East Hartford , ( 30:111 . , A Delaware corporation Appiica'tion August 17, 1956 , Serial No. 605685
1t ) Claims . ( Cl 23il - J - 122) The present invention relates to a gas plant turbinepower where there is high pressure compressor rotors independently and low pressure .
A feature of the invention is an arrangement for driving an accessory gear of the rotors without restricting the thermal expansion of any of the rotors Another feature is an arrangement for driving the accessory gear one rotor without applying any load said rotor axial thrust .
When the rotors are concentric such that an axis extending through the rotor and rotates with respect to the othershaft , it is desirable to support the shafts in concentric relation to each other by an intershaft bearing because if the "two shafts rotate in the same direction, this hearing then operate at a relatively low speed compared to a bearing support shaft with respect to the surrounding stationary structure . one feature of the invention - is the incorporation of the accessory drive end shaft which is supported by an intershaft bearing. Another feature is the incorporation of the labels by which enclose the bearing and accessory drive within achamber lubricant which is substantially tight.
Other objects and advantages will be apparent from the specification and claims and from the accompanying drawings invention.
. Figure 1 is a sectional view through the casing supporting the shafts and rotors is located between the low and high pressure .
- Figure 2 is a sectional view - afragmentary a larger scale of part of the device of FIG . l .
The invention is shown in relation to a division of the type shown compressorof - for example , in the Savin Patentno . 2,747,367 . '2 Outer casing supports the fixed blades 4 which alternate with rows ofblades 6 on the low pressure compressor rotor S , located upstream of the intermediate housing LTL. Inwardlyfrom this casing extends the casing 2 and supports the bearing 12 whereby the low pressure rotor concenillustrate is an embodiment of the electrically inside the housing . The bearings not only support the load compressor rotor radial low pressure " Butare also designed as thrust bearings by which to keep the compressor rotor 8 axially in position within ' the box. To this end, the inner races of -14 bearings are clamped between the flanges 16 and 18 in the rotor shaft 20 forthe .
Downstream of the deck shell 2carries one ' or more rows of stator vanes 22 alternating with rows of the stroke - interior and the support elements 36 so that the " free rotor can be 2-5 to expand axially at this point. be understood that the rotor 26 is supported by the axis of the high pressure rotor 28.
other downstream rolling bearing 30 which functions to maintain the rotor 26 against axial movement at that point with respect to the surrounding support structure .
The housing 10 includes a series of vanes 38 extending radially inwardly projecting from the housing 2 and suitably secured thereto . The inner ends of the blades 38 are interconnected by a ring 40 having a flange which projects inwardly extending obliquely 42 . This flange 44 has openings therein for receiving the bearing 46 to the accessory shaft 48 which extends radially .
Also'includes housing 10 which'are disks 50 and 52 are attached as by bolts 54 at its outer edge to the ring 40 and bearing elements inside ends oppositely extending frusto- conical 56 and 58. Discs 50 and 52 are attached as by bolts 60 at their inner ends to a ring 62 to which is attached the bearing 46 . The screws also support , through the projecting flange 63, a support bearing ring 64 to the thrust and radial bearings 12. The support ring 64 is also bolted to the upstream end of element 56 . This structure therefore supports the bearings 12 against axial movement and radial movement relative to the housing 10.
The bracket 46 has bearings 66 for the attachment shaft 48 which carries at its inner end a transmission gear accessory 68 . This gear is meshed with a gear 76 which is driven to achieve this, the gear 70 is splined to a sleeve 72 , fig. 2, which surrounds the shaft 28 and is driven from the shaft 28 by splines 74 . The gear 70 is held firmly in the socket 72 as by a clamping ring 76 . ' The sleeve 72, however, is axially slidable relative to the shaft 28 and slots 74 are constructed to allow this movement axially slidable .
A radial and thrust bearing 78 mounted on the inner shaft 20 and having its inner race 30 secured against axial movement on it , has its outer race 82 held at the inner surface of sleeve 72 as by a ring clamp 84 . The thrust bearing 78 is closely adjacent to the bearing 12 and accordingly the sleeve 72 is fixed against any axial movement and therefore is held in predetermined relation with the sprocket shaft 68 so that this gear and the gear 70 are engaged at all times. However, since the shaft 28 can move axially relative to the sleeve 72, it is obvious that thermal expansion of the shaft 28 in an axial direction is perand provided to prevent escape of lubricant thereof. This chamber is defined by the ring 62, the tapered element 56, a seal 88 and a ring 90 on the shaft 20 . Downstream of the ring 62 , the chamber is defined by the element 58, and a seal 92 which engages g'ear th'e 70 .
Slidaole seal 88 is axially in a cylindrical surface provided by a support ring 92 and is pushed axially against the ring 90 by a wave spring 94 . The support ring 92 and wave spring 94 are attached as by bolts 96 to the inner end of element 56 . These screws are also coupled to the upstream end of the support sleeve bearing 64 . Ring 90 may be attached to the same shaft 2d between flanges 16 and 18 that retain the inner ring 14 of the bearings 12 in place. Understood'that will flange 18 is not integral with the shaft 2% but is in the form of a clamping ring which can be threaded or otherwise removably attached to the shaft so that the inner races of the bearings can be mounted thereon .
The seal 92 is similar to the self- seal is axially slidable on a cylindrical surface provided by a ring 98 and pushed axially by a wave spring 100 which engages the downstream end of the sealing member and urged against the gear 1t 70 . Both seals 88 and 92 are of the type referred to as reversed seals in the lubricant reaches the seals from a point radially outwardly from the operating surface of the board which engages with the openings of 1% sleeve 72 so that the lubricant reaches the space 106 between the sleeve 72 and the inner shaft 20 , and this space provides lubricant bearings 78 and 30. The inner surface 108 of the high pressure shaft 28 is preferably diverging in a direction towards the audience 30 such that any lubricant which flows from the space past the bearing 106 is discharged by centrifugal force through the apertures 11% axis 28.
Although the surface 1 and 8 which is convergent , it is understood that the outer race 34 for the bearing 30 is not necessarily cylindrical to permit axial sliding movement which is provided for at this point.
Lubricant escape through the holes 110 in the shaft 28 flows along the sleeve 72 to lubricate the grooves 74, and outwardly through oblique bores 114 in the sleeve to be released against the teeth on the gears 68 and 70 .
Besides the accessory drive gear 70 , other units 7 may, for example , gear 116 fixed to the shaft 2%) adjacent to bearing 12 . Since this shaft is held against axial movement in this hearing, the gear can drive directly a gear , not shown, on a radial axis similar to gear 68 , the gear meshing with the gear 116 is angularly displaced from the gear 68 , as be evident.
It is understood that the invention is not limited to the specific embodiment illustrated and described herein, but may be used in other ways without departing from its spirit as defmed by the following claims .
Claim:
Two . in a power plant gas turbine having a rotor of the low pressure compressor and a rotatable rotor separated high pressure compressor , thus normally concentric shafts can rotate in the same direction and in which the rotors are mounted compressor, accessoly drive shaft between said rotors and having a bevel gear on one end a bevel drive gear and driven around the outside of said concentric shafts and meshed with said first gear , a thrust bearing inside said shafts to take the axial thrust of said driving gear and a bearing between said shaft adjacent said thrust bearing.
Three . In a power plant gas turbine having a rotor of the low pressure compressor and a rotatable rotor separated high pressure compressor , thus normally concentric shafts can rotate in the same direction and in which are mounted the compressor rotors , one housing in which said shafts are supported, an accessory drive shaft between said rotors and having a bevel gear on one end a conical gear drive gear according to the exterior of said concentric shafts and meshed with said first gear , a bearing of between said interior pressure . shaft and said drive gear for taking the drive of said drive gear and a bearing in said housing for supporting ' assaaas carry the inner shaft , said bearing being both a radial and a thrust bearing .
April . In a power plant gas turbine having a rotor of the low pressure compressor and a rotatable rotor separated high pressure compressor , thus normally concentric shafts can rotate in the same direction and in which are mounted the compressor rotors , one housing in which said shafts are supported, an accessory drive shaft between said rotors and having a bevel gear on one end a conical gear drive gear according to the exterior of said concentric shafts and meshed with said first gear , a bearing of thrust between said inner shaft and said drive gear for taking the drive of said drive gear and a bearing in said housing for supporting the inner shaft , said bearing being both a radial and thrust hearing , and a radial bearing between said inner and outer shafts .
May . In a power plant gas turbine having a rotor of low pressure compressor rotor and high pressure compressor separately rotating concentric shafts on which are mounted the compressor rotors , a housing between said rotors and having a thrust bearing within said support shaft against axial movement , a sleeve splined to the outer shaft , a thrust bearing between the inner shaft and said sleeve to maintain said sleeve against axial movement ,
a transmission gear accessories in said sleeve , and a gear driven by said cooperation drive gear and rotatable in said housing .
June . In a power plant gas turbine having a rotor of low pressure compressor rotor and high pressure compressor separately rotating concentric shafts on which the rotors are mounted oompressor a housing between said rotors and having a thrust bearing within said support shaft against axial movement , a sleeve spline to the outer shaft , a thrust bearing between the inner shaft and said sleeve to maintain said sleeve against axial movement , a transmission gear in said accessory gear sleeve and cooperation in said housing and a bearing between said shafts adjacent to said sleeve, and which allows relative axial movement between said shafts .
July . A power plant gas turbine having a rotor of the low pressure compressor and rotating separately ro'tor high pressure concentric shafts to which said rotors are secured , a housing between the rotors , carried by a bearing . said housing for supporting the interior of said shafts against axial movement , a thrust bearing on said inner shaft , a sleeve supported by said thrust bearing against axial movement and which surrounds said axle , said outer shaft grooves and the sleeve whereby the sleeve can be driven by said outer shaft , said grooves providing axial movement between said sleeve and said outer shaft .
August . A power gas turbine having a compressor rotor and separate low'pressure high pressure rotating rotors safe , concentric shafts which are secured said rotors , rotor housing between said one bearing supported by said housing for supporting the inside of said axes , a thrust bearing on said inner shaft , a sleeve carried by said thrust bearings against axial movement and which surrounds said axle , said outer shaft grooves and the sleeve by which the sleeve can be driven by said outer shaft , said grooves providing axial movement between said sleeve and said outer shaft , 2. gear in said sleeve and an accessory drive shaft in said housing having a gear meshing .
9. A power plant gas turbine having a rotor of low pressure compressor rotor and high pressure rotary separate , concentric shafts which are secured said rotors , a housing between said rotors , a bearing carried by said housing for supporting inside said axle thrust bearing on said inner shaft , a sleeve supported by said thrust bearing against axial movement and which surrounds said axle , said outer shaft grooves and the sleeve by which the sleeve may be driven by said outer shaft , said grooves providing axial movement between said sleeve and said outer shaft , said housing providing a chamber surrounding said bearing and sleeve , and sealing means located in said housing adjacent said first mentioned bearing.
10 . A power plant gas turbine having a rotor of low pressure compressor rotor and high pressure rotary separate , concentric shafts which are secured said rotors , a housing between said rotors , a bearing carried by said housing for supporting inside said axle thrust bearing on said inner shaft , a sleeve supported by said thrust bearing against axial movement and which surrounds the sleeve may be driven by said outer shaft ,
such grooves providing axial movement between said sleeve and said outer shaft , said housing providing a chamber which surrounds said bearings and sleeve , and sealing means located in said housing adjacent said first and said bearing sleeve adjacent to the end away from said first bearing.
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