DE102013221584A1 - Device for supplying a transmission, transmission device and method for supplying a transmission - Google Patents

Abstract

A device (107) for supplying a transmission (101) with lubricating oil (105) from a tank (103) has a feed line for guiding the lubricating oil (105) from the tank (103) to the transmission (101), a return for returning the lubricating oil (105) from the transmission (101) to the tank (103), a return valve (137) disposed in the return and configured to open in an open state for operating the transmission (101) in a dry sump mode Returning the lubricating oil (105) via the return valve (137) to allow and in a closed state for operating the transmission (101) in a wet sump mode to prevent the return of the lubricating oil (105) via the return valve (137), and an overflow device (132 ) disposed in the return passage and configured to return the lubricating oil (105) to the return valve (137) depending on a quantity of lubricating oil in the tank (103) or the transmission (101) to allow orbei.

Description

The present invention relates to a device for supplying a transmission for a wind turbine with lubricating oil from a tank, to a transmission device and to a method for supplying a transmission.

Stationary industrial gearboxes as well as gearboxes for wind turbines are predominantly operated in either wet sump mode or dry sump mode.

Both systems have their own advantages and disadvantages with regard to their startup behavior during cold start or warm operation.

It is the object of the present invention to provide an improved apparatus for supplying a transmission with lubricating oil from a tank, an improved transmission device and an improved method for supplying a transmission.

This object is achieved by a device for supplying a gear for a wind turbine with lubricating oil from a tank, a transmission device and a method for supplying a transmission according to the main claims.

In wet sump mode, the gearboxes are filled with oil and supplied with lubricating oil via a motor pump unit or a mechanical lubricating oil pump located on the gear unit. The lubricating oil is pumped out of the transmission sump via a z.T. Combined line, hose and bore system fed through corresponding filters and radiators the lubrication points. After the passage of the oil through the lubrication points, the heated oil is returned to the oil sump and it sets either a steady temperature, which is harmless to the transmission and oil, or there is a requirement that oil externally z. B. to cool over an oil-air cooler.

The increase in temperature of the oil is a consequence of the shear and pressure forces occurring in the gear oil during the lubrication process and a consequence of the fluidization of the oil by the gears constantly running in oil, so-called churning losses.

The heat generated by the splashing is released unused via the radiator or by convection to the environment. As the viscosity of the lubricating oil used increases, splashing losses increase.

During operation of the transmission in the dry sump mode, the required lubricating oil is located in a separate tank and is usually supplied to the transmission by a motor pump unit or by a mechanical pump flanged to the transmission via a suitable line, filter and cooling system. In this case, the transmission oil is heated when passing through / through the lubrication points. An additional heating of the oil by churning losses does not take place.

A comparison of the advantages and disadvantages of wet and dry sump operation shows the following.

A wet sump gearbox with a lubricating oil pump has advantages such as fast oil heating, good oil circulation and good emergency lubrication in case of pump failure. On the other hand, undesirable high churning losses, the need for a larger cooler, increased foaming by splashing, a possible cavitation in the pump and gearbox, increased thermal load of the lubricating oil, accelerated oil aging and accelerated viscosity degradation may be undesirable.

A dry sump gearbox with lubricating oil pump has advantages as no churning losses, the sufficiency of a small cooler, no unnecessary heat input and long oil life. In contrast, a long start-up phase, the requirement of larger oil heaters for a cold start and no emergency lubrication in the event of a pump failure may be undesirable.

The presented approach combines the advantages of wet sump mode and the benefits of dry sump mode in the operation of a transmission.

A device for supplying a transmission with lubricating oil from a tank has the following features:
a lead for guiding the lubricating oil from the tank to the transmission;
a return for returning the lubricating oil from the transmission to the tank;
a return valve disposed in the return and configured to allow the lubricating oil to be returned via the return valve in an open state for operating the transmission in a dry sump mode; and in a closed state for operating the transmission in a wet sump mode, returning the lubricating oil to prevent over the return valve; and
an overflow device disposed in the return and configured to allow the return of the lubricating oil to the return valve, depending on an amount of lubricating oil in the tank or the transmission.

In this case, the closed state of the return valve represent the rest position of the return valve. For example, the return valve can be returned from the open state by a return spring in the rest position. As a result, the transmission can be transferred or held during an emergency operation in the wet sump mode.

The apparatus may include adjusting means for adjusting an opening state of the return valve. In this case, the adjusting device may be designed to adjust the opening state of the return valve depending on a temperature of the lubricating oil. In this way, the transmission can be transferred depending on the temperature of the wet sump mode in the dry sump mode, and vice versa.

For this purpose, the adjusting device may have a pressure accumulator coupled to the flow, a temperature sensor for detecting the temperature of the lubricating oil and a control valve. The control valve may be configured to enable or disable a connection between the pressure accumulator and an actuating input of the return valve for adjusting the opening state of the return valve, controlled by the temperature detected by the temperature sensor. In this way, a simple temperature control of the return valve can be realized.

According to one embodiment, the overflow device can be designed as a riser bridging the return valve. The riser can be U-shaped. A height of the apex of the riser may define a level of a maximum oil level of the lubricating oil in the transmission during the wet sump mode. In this way, the maximum oil level of the lubricating oil can be adjusted very easily within the transmission.

Alternatively, the overflow device may be designed as a bypass line bridging the return valve with an overflow valve. In this case, the overflow valve may be designed to enable or block the bridging line depending on the amount of lubricating oil present in the tank. In this way, the maximum oil level of the lubricating oil within the transmission can be controlled by the amount of oil in the tank.

For this purpose, the device may have a float arranged inside the tank for setting a state of the overflow valve depending on a filling level of the lubricating oil in the tank. Using a float, the oil level within the tank can be easily determined and used to control the spill valve.

The device may further comprise a arranged in the flow and driven by the transmission mechanical pump. In this way, a torque fed into the transmission for conveying the lubricating oil from the tank to the transmission can be used. This is advantageous for an emergency operation of the transmission. Additionally or alternatively, the device may comprise an electric pump disposed in the flow. By the electric pump lubricating oil can be promoted from the tank to the transmission even when the transmission is at a standstill.

Furthermore, the device may comprise a rotating device, which is designed to operate the mechanical pump as a motor for rotating a transmission shaft of the transmission.

Such a rotating device may, for example, allow a person to move the mechanical pump by manual force or by using an accessory such as a hand crank or an electrically powered handset.

The device may additionally have a control device. The controller may be configured to monitor operating modes of the apparatus using operational parameters of the apparatus and to additionally or alternatively signal a required maintenance of the apparatus. An operating parameter may be, for example, a volume flow, an oil pressure, a temperature or a degree of contamination of the lubricating oil.

A transmission device for a wind turbine has the following features:
a transmission for the wind turbine;
a tank for storing lubricating oil for the transmission; and
a device for supplying a transmission with lubricating oil from a tank.

Thus, said device can be advantageously used in connection with a transmission.

A method for supplying a transmission with lubricating oil from a tank, wherein a flow is provided for guiding the lubricating oil from the tank to the transmission and a return for returning the lubricating oil from the transmission to the tank comprises the following steps:
Blocking the return to operate the transmission in a wet sump mode;
Allowing bypassing of the return according to an amount of lubricating oil in the tank or the transmission when the transmission is operated in the wet sump mode; and
Releasing the return to operate the transmission in a dry sump mode, depending on a parameter of the transmission or the lubricating oil.

The steps of such a method can be advantageously carried out in connection with means of said device for supplying a transmission with lubricating oil from a tank.

In such a method, the step of blocking may be performed in the event of failure of an electrical power supply to a device of the flow and additionally or alternatively the return. In this way, an undesirable dry running of the transmission can be prevented.

The step of releasing may be performed when a temperature of the lubricating oil is greater than a threshold temperature. In this way, it is possible to change from the wet sump mode to the dry sump mode when the temperature of the oil reaches a predetermined threshold.

The invention will now be described by way of example with reference to the accompanying drawings. Show it:

1 an illustration of a transmission device in the basic position; and

2 an illustration of a transmission device during the spinning operation and start-up;

3 a representation of a transmission device during normal operation;

4 an illustration of a transmission device during emergency operation;

5 an illustration of another transmission device during spinning and starting up;

6 a representation of another transmission device in basic position;

7 a representation of another transmission device in basic position; and

8th a flow diagram of a method for supplying a transmission with lubricating oil from a tank.

The same or similar elements may be provided in the following figures by the same or similar reference numerals. Furthermore, the figures of the drawings, the description and the claims contain numerous features in combination. It is clear to a person skilled in the art that these features are also considered individually or that they can be combined to form further combinations not explicitly described here.

1 shows a representation of a transmission device in basic position according to an embodiment of the present invention. The transmission device comprises a transmission 101 , a tank 103 for lubricating oil 105 and a device 107 to supply the gearbox 101 with the lubricating oil 105 from the tank 103 ,

The device 107 has a lead for guiding the lubricating oil 105 from the tank 103 to the transmission 101 and a return for returning the lubricating oil 105 from the transmission 101 to the tank 103 on.

The flow includes a first line 111 , a second line 112 and a third line 113 , The first line 111 leads from the tank 103 to a node 115 , the second line 112 also leads from the tank 103 to the node 115 and the third line 113 leads from the node 115 to the transmission 101 , According to this embodiment, in the first line 111 a first pump 121 and in the second line 112 a second pump 122 arranged. The first pump 121 is via a mechanical coupling with the gearbox 101 coupled. The first pump 121 is from the transmission 101 powered and is designed to lubricate oil 105 from the tank over the junction 115 in the transmission 101 to pump. The second pump 122 is powered by an electric motor 124 powered and is designed to lubricate oil 105 from the tank via the second line 112 , the node 115 and the third line 113 in the transmission 101 to pump. In the first line 111 is between the first pump 121 and the node 115 arranged a check valve. Accordingly, in the second line 112 , between the second pump 122 and the node 115 , a check valve arranged. In the third line 113 is arranged according to this embodiment, a radiator and a filter.

The return line comprises a fourth line 131 , a fifth line 132 and a sixth line 133 , The fourth line 131 leads from the gearbox 101 to a node 135 , the second line 132 leads from the node 135 to the tank 103 and the sixth line 133 leads from the node 135 to the tank 103 , In the sixth line 133 is a return valve 137 arranged. The return valve 137 is designed to be in an open state, the sixth line 133 release and in a closed state, the sixth line 133 to lock. The fifth line 132 is provided with an overflow device according to this embodiment, a by a float 138 controlled valve 139 includes. The swimmer 138 is inside the tank 103 arranged and trained to the valve 139 depending on a filling level of the lubricating oil 105 inside the tank 103 either in an open state or in a closed state. In the closed state of the valve 139 is the fifth lead 132 blocked. In the opened state of the valve 139 is the fifth lead 132 free, so lubricating oil bypassing the sixth line 133 through the fifth line 132 can flow into the tank.

The return valve 137 is controlled by a setting device. The adjusting device is adapted to the return valve from a rest position in which the return valve 137 closed and the sixth line 133 is thus locked to put in an open state in which the sixth line 133 free is. From the open state, the return valve 137 be returned to the rest position by a return spring. According to this embodiment, the adjusting means is configured to the opening state of the return valve 137 depending on a temperature of the lubricating oil 105 adjust. In this case, the adjusting device is designed to the return valve 137 in the open state, when the temperature of the lubricating oil 105 exceeds or reaches a threshold. According to this embodiment, the adjustment means to a temperature-controlled control valve 141 on that in a control line 142 between a pressure accumulator 143 and an actuating input of the return valve 137 is arranged. The accumulator 143 is via a check valve with an output side of the first pump 121 arranged portion of the first line 111 connected.

In the in 1 shown state of the transmission device is the tank 103 completely with lubricating oil 105 filled. The Tank 103 has a ventilation filter 145 up, through the air to compensate for a changing level of the tank 103 can flow.

The arrangements shown for the overflow device and the adjustment device are chosen only by way of example and can be replaced by other suitable devices.

A gear device, as in 1 can also be referred to as a 3-mode self-leveling electro-hydraulic lubrication oil system, also called 3MLOS.

The transmission device can be used for example in connection with oil pollution alarms on wind turbines. An oil contamination can be done for example by chips. The transmission device can be used as an alternative to existing systems. One application is, for example, an oil supply system for wind turbines, which is a placement of the oil tank 103 below the gearbox 101 allows. The approach described enables a guarantee of the transmission oil lubrication in all permissible operating modes. In this case, monitoring of operating data and approval of permissible operating modes as well as an output of operating data and calculation of dynamic maintenance recommendations can be realized. Advantageously, the transmission 101 at any time with purified oil 105 be supplied. Even in case of power failure, the system is functional. It is also feasible expansion stages that allow additional opportunities for self-protection of the system. The shown electro-hydraulically controlled lubricating oil system has self-leveling properties for the dry and wet sump operation of the transmission 101 on.

The system is designed to control the transmission by means of temperature-controlled switching between wet and dry sump 101 with lubricating oil 105 to supply and to automatically produce the lubricating oil supply in wet sump mode during emergency operation.

The system is designed to be the gearbox 101 at any permissible operating temperature and at any permitted operating point with a sufficient quantity of lubricating oil associated with the operating point 105 to supply.

Depending on the oil temperature, the normal operating modes are switched from wet to dry sump or vice versa, z. B. with decreasing power loss on the transmission 101 , from dry to wet sump.

In emergency operation, such as a power outage, the system automatically hydraulically switches from dry sump mode to wet sump mode and ensures sufficient lubrication oil supply to the transmission 101 in emergency and spin operation.

The system works autonomously even in the event of a power failure, so the transmission 101 is protected against lubricating oil shortage and expensive follow-up costs are avoided by bearing and Verzahungsschäden.

By actively pumping the oil 105 by means of the mechanical oil pump 121 from the tank 103 in the transmission 101 The preparation time for the next wet start of the system is shortened.

The lubricating oil system shown can operate in both wet sump and dry sump modes. For this no elaborate design of an additional tank for receiving additional oil volume from the wet sump operation is required.

As in the following with reference to the 1 to 4 described, the device works 107 , for example in the form of the 3MLOS system with three modes of operation and is in initial operation at initial start-up.

Mode 0 refers to the currentless home position at standstill or during startup.

Mode 1 is the startup phase or start-up phase as well as the spin operation of the transmission 101 in the wet sump, at an oil temperature below a threshold, for example T _oil <30 ° C, with ready-to-use system control referred to. The mode 2 is the normal operation in the dry sump mode, with an oil temperature at the threshold value, for example _oil ~ 30 ° C., with ready-to-use system control.

Mode 3 refers to emergency operation.

A functional description of mode 0, which corresponds to the basic position, is based on 1 , In addition shows 1 a circuit diagram of a cooling lubricant system in basic position.

In the currentless basic position is the transmission 101 mechanically blocked and both pumps 121 . 122 are out of order.

The oil tank 103 and the pipe system 111 . 112 . 113 . 131 . 132 . 133 is filled and vented.

The valves 137 . 141 are in the spring-actuated starting position.

The valve 139 is in the closed position, actuated by the buoyancy of the float 138 ,

There is no oil circulation.

2 shows a representation of a transmission device in the spin operation and startup according to an embodiment of the present invention. The gear device corresponds to the in 1 shown transmission device.

In the in 2 shown state is the transmission 101 operated in wet sump mode and is lubricated with oil 105 filled. Accordingly, the level of the tank 103 low. The accumulator 143 is filled. Through arrows is in 2 a flow of lubricating oil 105 inside the pipes 111 . 112 . 113 . 131 . 132 . 133 shown. The sixth line 133 is locked. oil 105 However, over the fifth line 132 in the tank 103 flow back.

Based on 2 a description of the mode is given 1 including wet sump mode and whirl operation. In addition shows 2 the circuit diagram of the cooling lubrication system in wet sump spin operation and start up.

When commissioning the system control, the transmission oil temperature is interrogated by means of a sensor and generated, for example at T <30 °, a 0 signal for the solenoid valve 141 , This leaves the valve 137 in its initial position and the free return of the transmission oil 105 in the tank 103 is locked.

By increasing the speed of the gearbox on the side, the oil delivery of the mechanical pump starts 121 , This sucks the gear oil 105 from the tank 103 and fills the accumulator on the one hand 143 while promoting oil 105 over the filter of the third line 113 into the transmission 101 , In parallel, the electrically driven pump promotes 122 oil 105 from the tank 103 into the transmission. This builds up in the transmission 101 an oil sump and the level in the tank 103 sinks.

That in the tank 103 The resulting vacuum is introduced with inflowing air via the ventilation filter 145 balanced.

The adjustable float valve 139 in the tank gives with decreasing oil level in the tank 103 the oil return from the gearbox 101 steplessly free, until at the valve 139 the equilibrium condition of geodesic pressure, gravity, internal frictional force against the buoyant force of the float 138 sets: F _P + F _G + F _R = F _A

The setting on the float 138 is done so that the equilibrium condition sets when in the transmission 101 the required oil level for wet sump operation is reached. At this point is the amount of extracted oil 105 , equal to the amount passing through the valve 139 in the tank 103 running back.

The gear 101 is now operated in the wet sump.

The heating of the transmission oil 105 on the one hand by the splashing of the gears of the transmission 101 in the transmission oil 105 and through the Power loss as well as in the tank 103 installed oil heater. When the switching condition T _oil > = 30 ° C is reached, the valve becomes 141 switched by the controller and the switch to mode 2 initiated.

3 shows a representation of a transmission device during normal operation according to an embodiment of the present invention. The gear device corresponds to the in 1 shown transmission device.

In the in 3 shown state is the transmission 101 operated in dry sump mode and is using only a little lubricating oil 105 filled. Accordingly, the level of the tank 103 high. The accumulator 143 is filled. Through arrows is in 3 a flow of lubricating oil 105 inside the pipes 111 . 112 . 113 . 131 . 132 . 133 shown. The sixth line 133 it is open. oil 105 can thus over the sixth line 133 directly into the tank 103 flow back.

Based on 3 a functional description of mode 2 is provided which includes a dry sump mode. In addition shows 3 the circuit diagram of the cooling lubrication system in dry sump normal operation.

The valve 141 is in the actuated position by the solenoid of the valve 141 and gives the control line 142 to the valve 137 free.

The valve 137 switches with the help of the pressure accumulator 143 stored energy on passage position and the oil 105 can out of the gearbox 101 in the tank 103 running back. The oil level in the tank 103 rises and the float valve 138 in the tank 103 closes the return via the valve 139 ,

The gear 101 is now in dry sump mode.

The return of the transmission oil 105 to the tank 103 now takes place exclusively via the valve 137 ,

The in the tank 103 Air is passing through the ventilation filter 145 delivered to the environment.

If the system control fails during operation, the 3MLOS enters the emergency mode transition to mode 3.

4 shows a representation of a transmission device during emergency operation according to an embodiment of the present invention. The gear device corresponds to the in 1 shown transmission device.

In the in 4 shown state is the transmission 101 operated in wet sump mode and is lubricated with oil 105 filled. Accordingly, the level of the tank 103 low. The accumulator 143 is filled. Through arrows is in 4 a flow of lubricating oil 105 inside the pipes 111 . 112 . 113 . 131 . 132 . 133 shown. The sixth line 133 is locked. oil 105 However, over the fifth line 132 in the tank 103 flow back.

Based on 4 a functional description of the mode 3, which corresponds to an emergency operation, is made. In addition shows 4 the wiring diagram of the cooling lubrication system in emergency mode.

In emergency mode, the valves switch 137 and 141 in the basic position and the lubricating oil supply of the gearbox 101 only takes place via the mechanical pump 121 ,

The gear 121 will return to oil according to the pump speed 105 filled and the valve 139 regulates the oil level in the gearbox 101 in wet sump mode.

This ensures that in the spinning operation, the transmission 101 always enough with oil 105 is supplied from the wet sump.

When the operational readiness of the system control is restored, the valve becomes 141 controlled depending on the oil temperature and switches either to wet or dry sump operation and the corresponding cycle runs off.

For the basic version of the 3MLOS system mentioned above, two optional expansion stages are provided.

For the first stage of development will be on the 3MLOS, so the device shown in the previous figures 107 or the transmission device shown consisting of the transmission 101 , the tank 103 as well as the device 107 , an electronic control system with appropriate sensors installed, the standard operating parameters such as flow, oil pressure, temperature, oil level, oil pollution switch queries depending on the configuration, and the system control outputs a signal for the respective permissible operating mode.

The system of transmission 101 and oil supply 103 thus automatically protects against an inadmissible power requirement outside permissible operating parameters. In the first expansion stage, the plant control ensures that only operating modes enabled by the 3MLOS can be approached.

For the second expansion stage, an extended control electronics will be installed on the 3MLOS, which will query standard operating parameters such as volume flow, oil pressure, temperature and oil level.

In addition, additional signals such as oil viscosity, water content, oil purity and filter differential pressure are processed and used as the basis for a dynamic maintenance indicator.

With the additional installation of a water separator and fine filter, the plant can be extended to a fourth mode, which signals the plant controller with a two-stage request for an automated maintenance mode.

In maintenance level 1, the oil care is initiated and carried out within defined limits during operation.

In maintenance level 2, the oil care is initiated and carried out within defined limits in standstill or spinning operation.

If a defined number of maintenances are exceeded within a defined period of time, a clarification of the cause of the non-permissible operating parameters is requested by the control.

A smart programming of the 3MLOS control system signals maintenance recommendations such as upcoming oil or filter changes or permissible remaining running times.

All connected operating parameters are continuously recorded and logged. An output of the operating data over the time axis shows the exceeding of the limit values.

The described approach has a number of advantages over conventional known systems.

Thus, the basic version of the 3MLOS can minimize the disadvantages of the single systems wet and dry sump lubrication and exploits the advantages of both systems.

Backward flow through a tank does not take place and the transmission 101 is always with filtered oil 105 provided.

A provision of additional oil volume is not needed.

The circulating oil 105 is sufficient to make the wet sump. The operating costs for the operator are thereby greatly reduced.

By providing clean oil 105 in each mode of operation, the life of the transmission 101 and its individual components.

Compared to wet sump gearboxes, the disadvantage of splashing losses is reduced to a minimum (warm-up phase only). Furthermore, the permanent foaming of the oil 105 and the resulting cavitation in the pumps 221 . 222 and avoided at the gearing parts.

Furthermore, the mechanical stress of the oil 105 reduced and thus kept the oil viscosity stable over a longer period.

Required coolers can be made smaller, as the churning losses present as heat energy need not be dissipated from the system.

In the warm-up phase, the splash losses contribute to a shorter heating time of the oil 105 at and the transmission 101 can be switched to full load operation. With enough wind power for a wind turbine, this means that full power can be tapped earlier and power efficiency maximized.

Pure dry sump gearboxes require sufficiently sized tank heaters to start from low temperatures and high viscosity oils to preheat the oil. These can be smaller with the 3MLOS. As in the wet sump operation of the transmission 101 only a small subset of the total volume of oil in the tank 103 located.

Due to the self-leveling function of the valve 139 even during the warm-up phase, a uniform heating of the lubricating oil 105 ensured.

In emergency mode, the system can operate without application of a supply voltage and without corresponding control signals to the solenoid-operated valve 141 The gear 101 supply with the survival-necessary amount of lubricating oil.

Another advantage of this concept is that no additional or larger tanks are needed for the absorption of the oil volume from the wet sump. This reduces the cost of oil filling and beyond the cost of due maintenance in terms of fresh oil quantity and disposal.

Due to lower mechanical and thermal load of the oil 105 in dry sump, the oil change intervals can be extended.

In summary, this means lower acquisition and maintenance costs in relation to the overall lifetime of the plant and thus lower electricity generation costs. By secure supply of the transmission 101 with filtered lubricating oil 105 results in a longer life of the transmission 101 and less susceptibility to repair. By monitoring the transmission oil temperature and other parameters such as viscosity and oil purity, the service life of the gearbox oil is also increased 105 extended and the transmission 101 at every possible operating point with sufficiently clean lubricating oil 105 provided. A dynamic maintenance recommendation based on various parameters, such as oil temperature, water content, viscosity, filter contamination, volume flow, enables a condition-dependent maintenance recommendation. This reduces the costs for spare parts and assembly inserts and allows conclusions about the condition of the gearbox 101 to. The extension of service life and the reduction in the need for repair contribute to increasing the availability of the system and thus increasing the power yield. Higher overall uptime due to reduced maintenance and repair times reduces the cost of power over the lifetime of the system.

Application areas of the 3MLOS are, for example, in the turbine of a wind turbine. The adaptation of the system can be for many different gears 101 carried out where the operation in the dry sump is possible and the placement of the tank 103 below the gearbox 101 enable. The Tank 103 can be below or offset below the gearbox 101 be arranged.

The lubricating oil supply system may be for a wind turbine gearbox 101 be used. The gear 101 should be able to be operated in a dry sump mode, in which in the transmission 101 hardly any oil 105 exists to reduce losses. In emergency mode or in trickle mode with little wind to the transmission 101 but up to a given level with oil 105 be filled so that the gears of the transmission 101 in the oil 105 submerge (wet sump mode). It will be the switching valve 137 in the oil return from the gearbox 101 to the tank 103 appropriate. Is this valve 137 open, that's how the oil runs 105 from the transmission 101 in the tank 103 from. Is the valve 137 closed, the oil level in the gearbox increases 101 until the oil 105 over the overflow 132 in the tank 101 flows. The oil is supplied by an electrically and mechanically driven pump 121 . 122 ,

5 shows a representation of another transmission device in the whirling operation and start-up according to an embodiment of the present invention. The transmission device points next to the transmission 101 and the tank 103 a device 107 to supply the gearbox 101 with lubricating oil 105 from the tank 103 on. The device 107 is according to the in 1 constructed device, with the difference that the valve 137 not outside, but inside the tank 103 is arranged, and that the overflow device as a the return valve 137 bridging riser 132 is executed. The riser 132 runs from the node 135 according to this embodiment, within the tank 103 is arranged as a U-shaped piece of pipe to from the tank 103 out and back into the tank 103 into it. Alternatively, the node 135 also outside the tank 103 be arranged. A vertex of the riser 132 represents an overflow that is at a height or a level 550 which is the maximum oil level in the transmission 101 Are defined.

The state of in 5 shown gear device corresponds to the basis of 2 described condition.

6 shows a representation of another transmission device in basic position according to an embodiment of the present invention. The transmission device corresponds to the transmission devices already described and additionally has a turn function or rotary function. To realize the turn function, the device 107 a rotating device 561 on, through which the mechanical pump 121 can be driven to one with the pump 121 coupled gear shaft of the gearbox 101 to operate. The turning device 561 can be realized by a cordless screwdriver or an external manual operation, through which a small additional pump 563 is driven. The additional pump 563 is together with a check valve 565 parallel to the pump 121 connected. By an additional shut-off valve 567 in the first line 111 can be achieved, that of the additional pump 563 subsidized oil 105 the pump 121 is supplied. A check valve 569 that in the first line 111 in front of the junction 115 is arranged according to this embodiment as a 5bar check valve 569 designed.

The following is the valve function of in 6 Described valve closer. The valve 141 causes in the 6 shown position that the 2/2 way cartridge valve 570 closes, so in the in 6 shown position, as the valve 570 is pressure balanced and thereby causes the spring closing. By closing the valve 570 this has to be done via line 111 to the gearbox 101 flowing oil through the 5bar preloaded check valve 569 to take. This increases the pressure level in the pipes 111 and 142 on 5bar. The valve 570 stays closed because it is still pressure balanced. The now on 5bar increased pressure in line 142 causes the valve 137 is moved to its closed position.

In short, the valve actuates 141 in the position shown, the valves 570 and 137 closing, whereby wet sump sets; in the other position the valve actuates 141 the valves 570 and 137 to open, which sets dry sump.

The on the in 6 shown circuit diagram allows a mechanic with a simple tool 561 , z. B. cordless screwdriver or hand crank, able to put one with the gearbox 101 coupled rotor of a wind turbine without additional energy (no wind) to turn to a specific position to perform maintenance, such. As the cleaning of the rotor blades, including a rotor blade should be positioned at bottom dead center.

7 shows a representation of in 6 shown gear device in basic position with a turn function according to an embodiment of the present invention. At the pump 561 is a small torque 571 at. At the pump 121 is one compared to the small torque 571 big torque 572 at.

8th shows a flowchart of a method for supplying a transmission with lubricating oil from a tank according to an embodiment of the present invention. The method may be carried out in conjunction with a transmission device described above. In one step 881 a return is blocked to operate the transmission in a wet sump mode. If the transmission is operated in wet sump mode, in one step 882 a bypassing of the return flow is enabled, depending on an amount of lubricating oil in the tank or the transmission. In one step 883 For example, the return may be enabled to operate the transmission in a dry sump mode, depending on a parameter of the transmission or the lubricating oil.

The exemplary embodiments shown are chosen only by way of example and can be combined with one another.

LIST OF REFERENCE NUMBERS

101

 transmission

103

 tank

105

 oil

107

 contraption

111

 first line

112

 second line

113

 third line

115

 junction

121

 first pump

122

 second pump

124

 electric motor

131

 fourth line

132

 fifth line

133

 sixth lead

135

 junction

137

 Return valve

138

 swimmer

139

 Valve

141

 Valve

142

 control line

143

 accumulator

145

 ventilation filter

550

 level

561

 rotator

563

 additional pump

565

check valve

567

 shut-off valve

569

check valve

570

 2/2 way cartridge valve

571

small torque

572

 big torque

881

 first step

882

 second step

883

 Third step

Claims (14)

Contraption ( 107 ) for the supply of a transmission ( 101 ) with lubricating oil ( 105 ) from a tank ( 103 ), comprising: a lead for guiding the lubricating oil ( 105 ) from the tank ( 103 ) to the transmission ( 101 ); a return for returning the lubricating oil ( 105 ) of the transmission ( 101 ) to the tank ( 103 ); a return valve ( 137 ), which is arranged in the return and is adapted to be in an open state for operating the transmission ( 101 ) in a dry sump mode the recycling of the lubricating oil ( 105 ) via the return valve ( 137 ) and in a closed state for operating the transmission ( 101 ) in a wet sump mode the recirculation of the lubricating oil ( 105 ) via the return valve ( 137 ) to prevent; and an overflow device ( 132 ), which is arranged in the return and is designed to be in dependence on a in the tank ( 103 ) or the transmission ( 101 ) amount of lubricating oil returning the Lubricating oil ( 105 ) on the return valve ( 137 ) to pass by. Contraption ( 107 ) according to claim 1, wherein the closed state of the return valve ( 137 ) the rest position of the return valve ( 137 ). Contraption ( 107 ) according to one of the preceding claims, with an adjusting device ( 141 ) for setting an opening state of the return valve ( 137 ), wherein the adjusting device ( 141 ) is formed to the opening state of the return valve ( 137 ) depending on a temperature of the lubricating oil ( 105 ). Contraption ( 107 ) according to claim 3, wherein the adjusting device comprises a pressure accumulator ( 143 ), a temperature sensor for detecting the temperature of the lubricating oil ( 105 ) and a control valve ( 141 ), wherein the control valve ( 141 ) is formed, controlled by the temperature detected by the temperature sensor, a connection between the pressure accumulator ( 143 ) and an actuating input of the return valve ( 137 ) for adjusting the opening state of the return valve ( 137 ) to release or block. Contraption ( 107 ) according to one of the preceding claims, in which the overflow device ( 132 ) as a the return valve ( 137 ) Bridging riser is executed. Contraption ( 107 ) according to one of claims 1 to 4, in which the overflow device ( 132 ) as one the return valve ( 137 ) bridging bridging line with an overflow valve ( 139 ) is executed, wherein the overflow valve ( 139 ) is adapted to the bypass line depending on the in the tank ( 103 ) to release or lock the amount of lubricating oil. Contraption ( 107 ) according to claim 6, with one inside the tank ( 103 ) arranged floats ( 138 ) for setting a state of the overflow valve ( 139 ) depending on a level of the lubricating oil ( 105 ) in the tank ( 103 ). Contraption ( 107 ) according to one of the preceding claims, arranged with a in the flow and by the transmission ( 101 ) drivable mechanical pump ( 121 ) and / or with an arranged in the flow electric pump ( 122 ). Contraption ( 107 ) according to claim 8, with a rotating device ( 561 ), which is adapted to the mechanical pump ( 121 ) as a motor for rotating a transmission shaft of the transmission ( 101 ) to operate. Contraption ( 107 ) according to one of the preceding claims, with a regulating device which is designed to operate using operating parameters of the device ( 107 ) Operating modes of the device ( 107 ) and / or a required maintenance of the device ( 107 ). Transmission device for a wind turbine, comprising: a transmission ( 101 ) for the wind turbine; a tank ( 103 ) for storing lubricating oil ( 105 ) for the transmission ( 101 ); and a device ( 107 ) according to one of the preceding claims for the supply of the transmission ( 101 ) with the lubricating oil ( 105 ) from the tank ( 103 ). Method for supplying a transmission ( 101 ) with lubricating oil ( 105 ) from a tank ( 103 ), wherein a lead for guiding the lubricating oil ( 105 ) from the tank ( 103 ) to the transmission ( 101 ) and a return for returning the lubricating oil ( 105 ) of the transmission ( 101 ) to the tank ( 103 ), and wherein the method comprises the following steps: locking ( 881 ) of the return for operating the transmission ( 101 ) in a wet sump mode; Enable ( 882 ) a bypassing of the backflow depending on a in the tank ( 103 ) or the transmission ( 101 ) amount of lubricating oil when the transmission ( 101 ) is operated in the wet sump mode; and sharing ( 883 ) of the return for operating the transmission ( 101 ) in a dry sump mode, depending on a parameter of the transmission ( 101 ) or the lubricating oil ( 105 ). The method of claim 12, wherein the step of blocking ( 881 ) is performed in case of failure of an electrical power supply means of the flow and / or the return. Method according to claim 12 or 13, wherein the step of releasing ( 883 ) is carried out when a temperature of the lubricating oil ( 105 ) is greater than a threshold temperature.

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