GB2111144A - Planetary gearing for driving a generator at constant speed - Google Patents
Planetary gearing for driving a generator at constant speed Download PDFInfo
- Publication number
- GB2111144A GB2111144A GB08230487A GB8230487A GB2111144A GB 2111144 A GB2111144 A GB 2111144A GB 08230487 A GB08230487 A GB 08230487A GB 8230487 A GB8230487 A GB 8230487A GB 2111144 A GB2111144 A GB 2111144A
- Authority
- GB
- United Kingdom
- Prior art keywords
- generator
- speed
- planetary gear
- power transmission
- main engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
- F16H47/02—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type
- F16H47/04—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type the mechanical gearing being of the type with members having orbital motion
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D13/00—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover
- G05D13/34—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power
- G05D13/36—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band, i.e. P regulating devices
- G05D13/40—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band, i.e. P regulating devices involving fluid governors of pump type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
- F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
- F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
- F16H37/08—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing
- F16H37/0833—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths
- F16H37/084—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths at least one power path being a continuously variable transmission, i.e. CVT
- F16H2037/088—Power-split transmissions with summing differentials, with the input of the CVT connected or connectable to the input shaft
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Structure Of Transmissions (AREA)
- Control Of Eletrric Generators (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Arrangement Of Transmissions (AREA)
- Reinforced Plastic Materials (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
A power transmission system for transmitting power from a variable speed main engine (4) to an electric generator (5) includes a planetary gear, having as elements an annulus (7), a sun wheel (6) and a planet carrier (8), and control means (1,2,3) for maintaining the speed of the generator substantially constant in the event of variations in the speed of the main engine (4). A first planetary gear element (7) is driven by the main engine (4), a second planetary gear element (8) drives the generator (5), and the third planetary gear element (6) is controlled by the control means (1,2,3) comprising a centrifugal regulator (3) for adjusting an hydraulic pump (1) which is connected to an hydraulic motor (2). <IMAGE>
Description
SPECIFICATION
A power transmission system
This invention reiates to a power transmission system for the transmission of power from a main engine to a generator. In particular, but not exclusively, the system finds applications in vessels where an electric generator and propelling means of the vessel are driven by the same engine, e.g. a diesel engine, operating at varying speed.
A vessel usually has a main diesel engine as its primary source of power. This engine operates within a wide speed range, primarily for propulsion of the vessel by means of a propeller or the like.
Other units, such as the electric generator of the vessel, can be connected to the main engine. A structurally uncomplicated arrangement is accomplished by connecting the propulsion system of the vessel, that is the propeller, the propeller shaft and usually also a reduction gear, together with the electric generator to the driving shaft of the main engine.
Most vessels use alternating current in their electric system. When driving an alternating current generator, it is important that the speed of the generator is practically constant. This means that, when reducing the speed of the main engine, the engine-generator speed ratio has to be changed. The most common disadvantage of the known prior art devices for this purpose is that they are too slow in reacting to changes in engine speed, which causes considerable variation in the speed of the generator.
An aim of the present invention is to provide a system for the transmission of power from a main engine, e.g. a diesel engine, to a generator, e.g. a synchronous generator, by means of which system the speed of the generator can be kept substantially constant in spite of changes in the speed of the engine. A further aim of the present invention is to provide a system, which is inexpensive, structurally uncomplicated and relatively easy to maintain.
According to the present invention, there is provided a power transmission system comprising a main engine operable at varying speed, an electric generator, a planetary gear including, as elements thereof, an annulus, a sun wheel and a planet carrier, a first of the said elements being arranged to be driven by said main engine and a second of the said elements being arranged to drive said generator, and control means for maintaining the speed of the generator at least substantially constant in the event of variations in the speed of the main engine and including means for sensing variations in the speed of a power transmission member between the main engine and the generator, and a regulator motor, controlled in dependence of the sensed speed variations, drivingly connected to the third of the said planetary gear elements to compensate for said sensed speed variations.
Suitably the control means includes a hydraulic pump connected by hydraulic power transmission means to power the regulator motor, the said hydraulic pump being controlled by said speed variations sensing means to control the flow of hydraulic fluid in said hydraulic power transmission means which controls said regulator motor. Preferably, the hydraulic pump is an adjustable displacement pump which is typically arranged to be driven by said main engine.
In a preferred practical embodiment of the invention, the said first planetary gear element comprises the annulus, the said second planetary gear element comprises the planet carrier and the said third planetary gear element comprises the sun wheel.
The invention will now be described, by way of example, with reference to the accompanying drawing, the sole figure of which is a schematic view, partly in section, of a power transmission system according to the invention.
Figure 1 shows a power transmission system for a vessel, the system enabling the transmission of power from a diesel engine 4 to an alternating current generator 5. The engine 4 has a driving shaft 14 having a gear wheel 10 mounted thereon. The gear wheel 10 drives a shaft 9 of the generator 5 via a planetary gear comprising a sun wheel 6, planet wheels 6a carried by a planet carrier 8 which is connected to the shaft 9 and an annul us 7 which meshes with the gear wheel 10.
A shaft 1 5 is also connected to the engine shaft 14 for transmitting power to propulsion units (not shown) of the vessel.
The system is provided with control means for maintaining the speed of the generator 5 at least substantially constant in the event of variations in the speed of the main engine. The control means include a hydraulic pump 1 with an adjustable displacement or stroke, and a hydraulic circuit 1 3 connecting the pump 1 to a regulator motor in the form of a hydraulic fluid operated motor 2. The adjustment of the hydraulic pump is accomplished, as known per se, by changing the angular position of the two main pump portions relative to each other. The motor 2 operates with a constant displacement, i.e. a constant piston stroke. The motor 2 has its shaft 2a connected to the sun wheel 6 of the planetary gear. The control means further includes a centrifugal regulator 3 connected to the generator shaft 9 by means of a pair of gear wheels 3a.The centrifugal regulator 3 is connected to operate the adjustment of pump 1 by means of a regulator arm 3c and a transmission bar 3b. In this way the displacement of hydraulic pump 1 is regulated by the actual speed of the generator. Power transmission between the engine shaft 14 and hydraulic pump 1 is arranged by means of a gear wheel carried by the shaft 14 and meshing with a gear wheel 1 2 connected to the shaft of the pump 1. The main members of the power transmission system are enclosed in a casing 1 6 having suitable supports 1 8 for the bearings 1 7 of the different shafts.
The regulation of the engine-generator speed ratio takes place as follows. The centrifugal regulator 3 senses a change in the speed of the generator shaft 9 and adjusts the piston stroke of the hydraulic pump 1. By hydraulic transmission through circuit 13, this causes a change in the speed of fluid motor 2 driving the sun wheel of the planetary gear. By controlling the speed of the sun wheel 6, the speed of rotation of the planet carrier 8 is controlled correspondingly to compensate for the change in speed of generator shaft 9 originally sensed by the centrifugal regulator 3.
In the embodiment shown, the generator 5 is
connected to engine 4 at the same side as the
propulsion shaft 1 5. It is also feasible to have the
generator and the propulsion shaft at opposite
ends of engine 4.
Although in the described embodiment the
speed of the sun wheel is controlled to control the
speed of rotation of the annulus to compensate for
speed changes of the engine 4, it will be
appreciated that other control arrangements are
possible using a planetary gear. Thus any one of
the planetary gear elements (annulus, sun wheel
or planet carrier) could be driven by the main
engine, with either of the two remaining planetary
gear elements arranged to drive the generator
shaft, and the remaining planetary gear element
being controlled to control the speed of the
generator shaft to compensate for changes in the
speed of the main engine.
Claims (8)
1. A power transmission system comprising a
main engine operable at varying speed, an electric
generator, a planetary gear including, as elements
thereof, an annulus, a sun wheel and a planet
carrier, a first of the said elements being arranged
to be driven by said main engine and a second of
the said elements being arranged to drive said
generator, and control means for maintaining the
speed of the generator at least substantially constant in the event of variations in the speed of the main engine and including means for sensing variations in the speed of a power transmission member between the main engine and the generator, and a regulator motor, controlled in dependence of the sensed speed variations, drivingly connected to the third of the said planetary gear elements to compensate for said sensed speed variations.
2. A system according to claim 1, in which the control means includes a hydraulic pump connected by hydraulic power transmission means for powering the regulator motor, the said hydraulic pump being controlled by said speed variations sensing means to control the flow of hydraulic fluid in said hydraulic power transmission means for controlling said regulator motor.
3. A system according to claim 2, in which said hydraulic pump is an adjustable displacement pump.
4. A system according to claim 2 or 3, in which said hydraulic pump is arranged to be mechanically driven by said main engine.
5. A system according to any of the preceding claims, in which the said first planetary gear element comprises the annulus, the said second planetary gear element comprises the planet carrier and the said third planetary gear element comprises the sun wheel.
6. A system according to any of the preceding claims, in which the said power transmission member comprises a shaft of the generator.
7. A power transmission system constructed and arranged substantially as herein described with reference to, and as illustrated in, the accompanying drawing.
8. A vessel incorporating a power transmission system according to any of the preceding claims.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI811749A FI67749C (en) | 1981-06-04 | 1981-06-04 | VARIATORVAEXEL FOER DIESELDRIVEN SYNKRONGENERATOR |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2111144A true GB2111144A (en) | 1983-06-29 |
Family
ID=8514469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08230487A Withdrawn GB2111144A (en) | 1981-06-04 | 1982-10-26 | Planetary gearing for driving a generator at constant speed |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE3239853A1 (en) |
| FI (1) | FI67749C (en) |
| GB (1) | GB2111144A (en) |
| NO (1) | NO823580L (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150155758A1 (en) * | 2012-06-12 | 2015-06-04 | Flux Drive, Inc. | Apparatus, Method and System For Dual Speed Generation |
| CN113107666A (en) * | 2021-05-12 | 2021-07-13 | 潍柴动力股份有限公司 | Constant-speed control equipment and method for generator |
| SE2100126A1 (en) * | 2021-08-18 | 2023-02-19 | Roland Davidsson | Electromechanical powertrain for vehicles |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3562296D1 (en) * | 1984-03-01 | 1988-05-26 | Schweizerische Lokomotiv | Variable transmission and slow-rotation arrangement |
| DE3438893A1 (en) * | 1984-10-24 | 1986-04-24 | Arno Dipl.-Ing. 6301 Rabenau Eichmann | Power generating system |
| DE3523066A1 (en) * | 1985-06-27 | 1986-01-16 | Eduard 8063 Odelzhausen Seidl | Generator having a combustion engine drive |
| US4862770A (en) * | 1987-07-13 | 1989-09-05 | Borg-Warner Automotive, Inc. | Two-speed alternator drive |
| DE4029253A1 (en) * | 1989-09-30 | 1991-04-11 | Jochen Reckeweg | Vehicle constructed for fresh food delivery and prepn. - is equipped with alternative electric generator sets for supplying heating and cooling loads in mobile operation |
-
1981
- 1981-06-04 FI FI811749A patent/FI67749C/en not_active IP Right Cessation
-
1982
- 1982-10-26 GB GB08230487A patent/GB2111144A/en not_active Withdrawn
- 1982-10-27 DE DE19823239853 patent/DE3239853A1/en not_active Withdrawn
- 1982-10-27 NO NO82823580A patent/NO823580L/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150155758A1 (en) * | 2012-06-12 | 2015-06-04 | Flux Drive, Inc. | Apparatus, Method and System For Dual Speed Generation |
| CN113107666A (en) * | 2021-05-12 | 2021-07-13 | 潍柴动力股份有限公司 | Constant-speed control equipment and method for generator |
| SE2100126A1 (en) * | 2021-08-18 | 2023-02-19 | Roland Davidsson | Electromechanical powertrain for vehicles |
Also Published As
| Publication number | Publication date |
|---|---|
| FI67749B (en) | 1985-01-31 |
| FI67749C (en) | 1985-05-10 |
| NO823580L (en) | 1983-04-28 |
| DE3239853A1 (en) | 1983-05-05 |
| FI811749L (en) | 1983-04-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |