JP6896168B2 - Fluid system with accumulator for disc set pressing in steplessly adjustable winding transmission and steplessly adjustable winding transmission - Google Patents

Description

The present invention is a fluid system for a steplessly adjustable hoisting transmission, preferably formed as a hydraulic system, the first pump driven by an electric motor and the second pump driven by an electric motor. The first connection with the pump is provided, the first connection of the first pump is connected to the (first) conduit section leading to the reservoir / holding container / tank, and the second connection of the first pump is. , Fluidly connected to both the first actuating device, located corresponding to the first disk set of the winding transmission, and the first connection of the second pump, of the second pump. The second connection relates to a fluid system that is fluidly connected to a second actuator arranged corresponding to a second disk set of the hoisting transmission. That is, this fluid system is formed as a push pump and a (first) pump that supplies the minimum pressure to both actuators of both disc sets during operation and a displacement pump that is second during operation. It has both a (second) pump that steplessly adjusts the gear ratio of the winding transmission by pumping fluid back and forth between the first activator and the second actuator. Furthermore, the present invention relates to a continuously variable transmission for a power transmission system of an automobile equipped with the fluid system.

The fluid system and the stepless adjustable winding transmission described in the superordinate concept of the independent claim are already well known based on the prior art. For example, US Pat. No. 6,219,608 discloses an automotive transmission electronic control system with a steplessly adjustable transmission. In this case, first and second electric motor driven fluid pumps for pressing and displacement of the variator of the winding transmission are included.

Therefore, it is already known from the prior art that a continuously variable transmission (also referred to as a CVT transmission for short) is controlled by an electric pump actuator in various pump forms. In order to maintain the pressing pressure required depending on the torque and gear ratio of the CVT transmission, it is necessary to provide a considerable current during operation, especially with respect to the first pump acting as the pressing actuator. This continuous current consumes power permanently from the vehicle's on-board power supply, which in turn results in constant loss, and in order to withstand this continuous current, compare the electric motor of the first pump for thermal reasons. It may have to be constructed in a large size, or on the contrary, it may have to be actively cooled by external means.

Therefore, an object of the present invention is to provide a fluid system for a steplessly adjustable hoisting transmission, which eliminates the above-mentioned drawbacks known from the prior art and is particularly highly efficient. ..

This is solved based on the present invention by having the first pump fluidly connected to the accumulator / connected to the accumulator on the side of its first connection.

The accumulator keeps the first pump at a minimum pressure on the side of the first connection used as its inlet / suction side as it fills the actuator until it reaches a predetermined pressure. This leads to the fact that the first pump only needs to form and maintain a relatively small pressure difference in order to generate a predetermined pressure for pressing each actuator. Further, this makes it possible to significantly reduce the driving power of the first pump. The power requirements of the fluid system are also reduced. As a result, there are additional benefits in terms of fuel consumption.

Another advantageous embodiment is claimed by the sub-claims and is described in more detail below.

Advantageous for keeping the configuration of the fluid system particularly simple is that a shutoff valve is inserted in the (first) conduit section leading from the first connection of the first pump to the reservoir, and the accumulator This is a case where the connection region is provided between the shutoff valve and the first connection portion of the first pump, and is (fluid) connected to the pipeline division.

The shutoff valve is conveniently configured as a check valve, thus making the implementation of fluid systems particularly inexpensive.

In addition to the first and second pumps, a third pump is advantageously provided, the third pump leading from the first connection of the first pump to the reservoir (first). ) Through the pipeline section, the first connection portion of the first pump is connected or can be connected (depending on the position of the shutoff valve, if provided). This greatly simplifies filling the accumulator.

The third pump is preferably realized as an electric motor drive type pump, and more preferably as an internal combustion engine drive type pump.

Also, if the fluid flows from the third pump towards the connection area (during the operation of the fluid system), the shutoff valve is open / open and the fluid is directed from the connection area towards the third pump. It is also convenient if the shutoff valve is inserted between the third pump and the first pump, just as the shutoff valve is closed / closed when the fluid flows.

Further, when the third pump is connected to the cooling medium and / or the lubricating medium circulation circuit of the winding transmission, cooling or lubrication of the winding transmission is particularly easily provided.

In this case, the third pump is formed as a pump with a fixed, i.e., non-adjustable pumping direction, the inlet connection of the third pump is (fluid) connected to the reservoir, and the third It has been found to be particularly advantageous if the outlet connection of the pump is (fluid) connected to the (first) conduit section leading from the first connection of the first pump to the reservoir. As a result, the third pump is inserted so as to guide the fluid from the reservoir to the accumulator, especially over a short distance.

Even more advantageous with respect to the third pump as a pump with a fixed pumping direction is for a continuously variable transmission where the third pump is (additionally) via a valve on the side of its outlet connection. When the (fluid) action is connected to the cooling medium and / or the lubricating medium supply device. The valve more preferably disconnects the cooling medium and / or the lubricating medium supply device from the third pump in its initial position and the cooling medium and / or the lubricating medium supply device in the second position. It is formed so as to be connected to the outlet connection portion of the pump of No. 3. This makes the fluid system even more easily constructed.

It is also convenient to form the third pump reversibly with respect to its pumping direction, i.e. as a reversible pump, as an alternative to the configuration of a third pump having a fixed pumping direction. In this case, the third pump, which is preferably reversible with respect to its pumping direction, pumps the fluid towards the first pump / accumulator in the first rotation / pumping direction and with the first rotation direction. Is inserted so as to pump fluid towards the cooling and / or fluid feeder in the opposite second direction of rotation / pumping.

In this case, a further advantage with respect to the configuration of the fluid system is when the third pump is (fluid) connected to the reservoir via dual pressure valves.

Furthermore, the first pump and, more preferably, the second pump are also formed as reversible pumps / reversible pumps in their pumping direction, respectively.

First connection / first connection of the first pump to monitor pressure on the side of the (first) pipeline section between the first connection of the first pump and the reservoir. It is also advantageous if a pressure sensor is inserted in the (first) pipeline section between and the shutoff valve. Another pressure sensor is preferably inserted between the first pump and the second pump and / or between the second pump and the second actuating device.

Even more advantageous is the case where the second pump can be connected to the cooling medium and / or the lubricating medium circulation circuit via another valve on the side of its second connection. This makes it particularly easy to reduce the excess pressure.

The present invention is further a stepless adjustable winding transmission for an automobile power transmission system, based on the first and second disc sets, and at least one of the above configurations. The fluid system according to the invention is provided, the first actuating device is actuated and connected to the first disk set, and the second actuating device is actuated and connected to the second disk set, which is steplessly adjustable. Regarding the winding transmission.

That is, in other words, based on the present invention, the accumulator supplies the feed pressure to the electric pump actuator (first pump) for the CVT transmission. In particular, it has been proposed to provide feed pressure via a pressure accumulator to the low pressure side (first connection) of the pressing actuator (first pump), so that the pressing actuator even overcomes the pressure difference. I'm getting better. The accumulator is preferably filled to reach the feed pressure at a short distance from another (third) pump, more preferably a cooling oil pump.

The present invention will be described in more detail below with reference to the drawings showing a number of different embodiments.

FIG. 6 is a schematic circuit diagram of a fluid system according to the first embodiment according to the present invention, showing how the fluid system according to the present invention is used in a steplessly adjustable winding transmission, and a third pump. However, it is recognized that it is realized as a pump having a fixedly adjusted pumping direction. It is a schematic circuit diagram of a fluid system based on the second embodiment of the present invention used in a stepless adjustable winding transmission, and is a second pump of the fluid system as compared with the first embodiment. A second connection can be selectively connected to the cooling medium and / or lubrication medium circuit of the winding transmission via an additional valve. FIG. 6 is a schematic circuit diagram of a fluid system based on a third embodiment of the present invention used in a stepless adjustable winding transmission, wherein the third pump is realized as a reversible pump and is a cooling device. And / or connected to a dual pressure valve for use in supplying to a cooling medium feeder. It is a schematic circuit diagram of the fluid system based on the 4th embodiment of the present invention used in the stepless adjustable winding transmission, and is the 2nd pump of the fluid system as compared with the 3rd Example. A second connection can be selectively connected to the cooling medium and / or lubricating medium circulation circuit of the winding transmission via an additional valve.

The drawings are only schematic and are used solely for the understanding of the present invention. The same members are designated by the same reference numerals. Different features of different embodiments may be freely combined with each other.

With respect to FIG. 1, a fluid system 1 based on the first embodiment of the present invention is recognized. The fluid system 1 is already used in FIG. 1 for steplessly adjustable winding transmission 2 to operate a variator of the winding transmission 2 (not shown here for readability). The steplessly adjustable winding transmission 2 is typically used in an automobile power transmission system during its operation. The first disc set 9 (formed from a pair of discs) of the winding transmission 2 is typically non-rotatably coupled to the drive shaft via endless tension means 26. The second disc set 13 (also formed from a pair of discs) that is rotationally coupled to the first disc set 9 is further non-rotatably coupled to the driven shaft. That is, each disc set 9, 13 has at least one first disc slidable with respect to the second disc, in which case the sliding of the first disc relative to the second disc. The moving position can be displaced by the actuating devices 10 and 14 (variator) of the fluid system 1. Activators 10 and 14 are not shown in detail in the drawings for clarity and are only suggested with respect to their location. Therefore, the gear ratio between the drive shaft and the driven shaft can be adjusted steplessly according to the distance between the two discs of the disc sets 9 and 13.

The fluid system 1 typically has a first motor driven pump 3 (also referred to as a first pump actuator) and a second motor driven pump 4 (also referred to as a second pump actuator). There is. That is, each of the pumps 3 and 4 has electric motors 27a and 27b for driving them. Both the first pump 3 and the second pump 4 are formed as reversible pumps. The first pump 3 acts as a push pump, i.e., as a pump that supplies minimum pressure from the sides of the first actuating device 10 and the second actuating device 14 during operation. The second pump 4 acts as a displacement pump, i.e., a pump that reciprocally pumps fluid between the first actuating device 10 and the second actuating device 14 to displace the disk pairs of the disc sets 9 and 13.

The first connection portion 5 of the first pump 3 is fluidly connected to the first pipeline division 7, and in this case, the first pipeline division 7 leads to the reservoir 6. The second connection portion 8 of the first pump is fluidly connected to the second pump 4. For this purpose, a second pipeline section 28 is provided in which the second connecting portion 8 of the first pump 3 is fluid-connected directly to the first connecting portion 11 of the second pump 4. At the same time, the first operating device 10 is fluidly connected to the second pipeline section 28. To this end, the first actuating device 10 is connected to the second pipeline section 28 via the (second) connection zone 29 with respect to its pressure chamber (not shown here for clarity). There is. The second connection portion 12 of the second pump 4 is connected to the second actuating device 14, that is, the pressure chamber (not shown for the sake of visibility) of the second actuating device 14. For this purpose, a third pipeline division 30 is provided between the second connecting portion 12 of the second pump 4 and the second operating device 14.

The connection portions 5, 8; 11 and 12 of both the first and second pumps 3 and 4 are used as an inlet side / suction side or an outlet side / discharge side depending on the pumping direction of the pumps 3 and 4. The first pump 3 serves to maintain a minimum pressure on the side of the second line section 28, which is also connected to the third line section 30 via the second pump 4, in particular during operation. .. If the pressure falls below the corresponding minimum pressure in the second line section 28 and / or the third line section 30, the first pump 3 operates in the first pumping direction and therefore the first connection 5 Is used as the suction side of the first pump 3, and the second connection portion 8 is used as the discharge side of the first pump 3. Therefore, the fluid is pumped from the first pipeline section 7 to the second pipeline section 28. If the maximum pressure is reached or exceeded in the second line section 28 and / or the third line section 30, the first pump 3 is deactivated or even the first. It is operated in the second pumping direction opposite to the pumping direction, so that the first connecting part 5 is used as the outlet side and the second connecting part 8 is used as the inlet side.

When the second pump 4 is operated in the first pumping direction, the first connecting portion 11 is used as the suction side and the second connecting portion 12 is used as the discharge side, so that the fluid is a second pipe. It is pumped from the road division 28 to the third pipeline division 30. In the second pumping direction of the second pump 4, which is opposite to the first pumping direction, the fluid is pumped from the third pipeline section 30 to the second pipeline section 28. In this case, the first connecting portion 11 is used as the discharge side, and the second connecting portion 12 is used as the suction side.

Based on the present invention, the accumulator 15 is permanently connected to the side of the first connection portion 5 of the first pump 3. The accumulator 15 permanently supplies a predetermined fluid pressure (minimum pressure) to the first connection portion 5. The accumulator 15 is connected to the (first) connection area 17 with respect to the first pipeline section 7. As a result, the accumulator 15 is directly and permanently connected to the first connection portion 5 of the first pump 3. The first connection region 17 is located between the shutoff valve 16 formed as a check valve and the first connection portion 5 in the first pipeline division 7. The shielding valve 16 closes when a predetermined fluid pressure (maximum pressure) is reached on the side of the first connecting portion 5 / accumulator 15, and the predetermined fluid pressure (on the side of the first connecting portion 5 / accumulator 15). It is inserted so that it opens when it falls below the minimum pressure).

A third pump 18 is further actuated and connected to the first pipeline section 7. The third pump 18 is formed as an electric motor-driven third pump 18 in this configuration. That is, the third pump 18 is also driven by the (third) electric motor 27c. On the other hand, in another configuration, it is possible in principle to form the third pump 18 as an internal combustion engine-driven third pump 18. In this case, in this alternative configuration, the third pump 18 is driven by the internal combustion engine of the vehicle's power transmission system.

The third pump 18 has one fixed pumping direction in the first embodiment shown in FIG. The third pump 18 is inserted between the reservoir 6 and the first pipeline section 7, and is used to pump the fluid from the reservoir 6 to the first pipeline section 7. The first connection 20 realized as the (fixed) inlet connection (/ suction connection) of the third pump 18 is fluid-connected directly to the reservoir 6. The second connecting portion 21 realized as the (fixed) outlet connecting portion (/ discharge connecting portion) of the third pump 18 is connected to the first pipeline section 7. The second connecting portion 21 of the third pump 18 is connected to the first pipeline section 7 on the side of the shutoff valve 16 opposite to the first connecting region 17.

The third pump 18 is implemented as a cooling medium / lubricating medium pump, and during operation, selectively as part of the cooling medium and / or lubricating medium circulation circuit 19 depending on the position of the shutoff valve 16. Alternatively, it is inserted so as to supply a fluid to the accumulator 15 via a shutoff valve 16. For this reason, in the first pipeline division 7, another third connection region 31 is provided on the side of the shutoff valve 16 facing the third pump 18, and the third connection region 31 is provided. Is connected to another fourth pipeline section 32. The fourth pipeline section 32 is connected to the cooling medium and / or the lubricating medium supply device 24 (hereinafter, abbreviated as the supply device 24) of the cooling medium and / or the lubricating medium circulation circuit 19. In the fourth pipeline section 32, a first fluid valve 22 is inserted between the third connection region 31 and the supply device 24. The feeder 24 is typically used to cool and lubricate each disc set 9, 13 or variator, as well as to cool or lubricate the contact point between the disc sets 9, 13 and the endless tensile means 26. The supply device 24 is also generally used to cool a starting member of an automobile power transmission system, such as a clutch or converter. This is possible because the thermal time constant of the starting member allows for a temporary interruption of the cooling medium volume flow. The first fluid valve 22 disconnects the supply device 24 from the second connection portion 21 of the third pump 18 at its initial position (first position), and connects the supply device 24 to the second connection at the second position. It is inserted so as to connect to the portion 21. As a result, the first fluid valve 22 is formed and inserted in this configuration so that the fluid flow is released or shut off / interrupted from the third pump 18 towards the supply device 24.

During operation, the first fluid valve 22 formed as a solenoid valve is switched / controlled according to the fluid pressure in the accumulator 15 / at the first connection 5 of the first pump 3. The third pump 18 is permanently driven. Below the minimum pressure on the side of the first connection 5 of the first pump 3 / accumulator 15, the first fluid valve 22 is brought to its first position. In this way, based on the interruption of the fluid connection that occurs between the second connection 21 of the third pump 18 and the supply device 24, the shutoff valve 16 is continuously pumped by the third pump 18. Opened under pressure. As a result, the pressure on the side of the first connecting portion 5 rises again with the further pumping of the third pump 18, and the accumulator 15 is refilled. When the accumulator 15 is filled with a predetermined fluid pressure (maximum pressure), the first fluid valve 22 is switched to its second position. The shutoff valve 16 closes automatically based on the reconnection between the second connection 21 and the supply device 24. This is because the pressure on the side of the supply device 24 is lower than the pressure in the accumulator 15.

As an alternative to this configuration, the first fluid valve 22 is also formed and inserted in another configuration to cause a division of the volumetric flow pumped by the third pump 18. In this case, the first fluid valve 22 allows the first partial volume flow (at the main position of the first fluid valve 22) to flow from the second connection 21 of the third pump 18 towards the supply device 24. Together, a second partial volume flow is inserted and formed to flow from the second connection 21 towards the accumulator 15 / first connection 5 (via the open shutoff valve 16).

Based on this pumping type, the three pumps 3, 4 and 18 can each preferably be configured with the same rated output. This greatly simplifies the configuration of the system. In order to monitor each pressure in the first pipeline division 7, the second pipeline division 28 and the third pipeline division 30, the first pipeline division 7, the second pipeline division 28 and the second pipeline division 20 are to be monitored. A pressure sensor 33 is connected to each of the pipeline divisions 30 of 3. With respect to the first pipeline section 7, the pressure sensor 33 is connected to the first connection region 17.

FIG. 2 specifically shows a second embodiment of the fluid system 1 according to the present invention. The second embodiment, like the examples described below with reference to FIGS. 3 and 4, is configured and functions substantially based on the first embodiment, and thus is described below. Only the differences from the first embodiment will be described.

In the second embodiment shown in FIG. 2, the third pipeline section 30 is directly connected to the supply device 24 / cooling medium and / or the lubricating medium circulation circuit 19 via another (second) fluid valve 23. Fluid connection is possible. For this purpose, the branch pipeline 35 is connected to the fourth connection region 34 in the third pipeline division 30, and the branch pipeline 35 is connected to the supply device 24 via the second fluid valve 23. It is possible. The second fluid valve 23 is also configured as a solenoid valve. The second fluid valve 23 is configured and functions substantially based on the first fluid valve 22. At the first position of the second fluid valve 23, the third line section 30, and thus the second connection 12 of the second pump 4, is disconnected from the cooling medium and / or the lubrication medium device 24. .. At the second position of the second fluid valve 23, the third pipeline section 30 is fluid connected to the supply device 24.

With respect to FIG. 3, a third embodiment of the fluid system 1 is specifically shown. This fluid system 1 is particularly different from the fluid system 1 of the first embodiment in that the third pump 18 is configured as a reversible pump like the first and second pumps 3 and 4. ing.

Further, the third pump 18 cooperates with the dual pressure valve 25. The dual pressure valve 25 is connected to the reservoir 6 at the inlet 36. The dual pressure valve 25 is connected to the first pipeline section 7 by the first outlet 37. The first outlet 37 is connected to the shutoff valve 16 on the side opposite to the first pump 3 (directly to the first pipeline section 7). The second outlet 38 of the dual pressure valve 25 is directly connected to the fourth pipeline section 32 on the side of the supply device 24. The third pump 18 is inserted in parallel with the dual pressure valve 25. The third pump 18 is connected to the first pipeline section 7 (here, via the third connection region 31) by the second connection portion 21, with respect to the first connection portion 20. Is connected to the fourth pipeline section 32.

Depending on the pumping direction of the third pump 18, the dual pressure valve 25 closes or opens the corresponding outlets 37 and 38. In the first pumping direction of the third pump 18, the first outlet 37 is closed and the second outlet 38 is open, so that the fluid flows from the reservoir 6 to the inlet 36 and the second outlet. Through 38, the fourth pipeline division 32, the first connection portion 20 (inlet side) of the third pump 18, and the second connection portion 21 (outlet side) of the third pump 18. , Shutoff valve 16 / flows toward the third connection region 31. Since the shutoff valve 16 is open in this first pumping direction of the third pump 18, the accumulator 15 is also filled to reach a predetermined fluid pressure. In the second pumping direction of the third pump 18, which is opposite to the first pumping direction, the first outlet 37 is open and the second outlet 38 is closed, so that the fluid enters the inlet. 36, the first outlet 37, the first pipeline division 7 (the side of the shutoff valve 16 facing the first connection region 17), and the second connection 21 (inlet) of the third pump 18. The side) and the first connection portion 20 (outlet side) of the third pump 18 are pumped to the fourth pipeline section 32, and the pump is pumped from there toward the supply device 24.

In addition, in this configuration, a check valve 39 is inserted between the third pump 18 and the supply device 24 (in the fourth pipeline section 32). The check valve 39 closes / closes during operation of the pump 18 in the first pumping direction (fluid flows from the reservoir 6 through the inlet 36 and the second outlet 38 into the first connection 20). It is inserted so that it can be switched to a position, which prevents air from being sucked into the side of the supply device 24. In this case, the check valve 39 is arranged in a portion other than the portion of the fourth pipeline division 32 that directly connects the second outlet 38 and the first connecting portion 20. In the second pumping direction of the third pump 18, the check valve 39 is open (from reservoir 6 to inlet 36, first outlet 37, second connection 21, first connection 20 and second. Allows the flow of fluid towards the supply device 24 (via the conduit section 32 of 4).

In the fourth embodiment, as compared to the third embodiment, an additional branch line 35 is also connected to the second pump 4 together with the second fluid valve 23, and these additional details are described. It has already been described in relation to the second embodiment (compared to the first embodiment).

In other words, in the present invention, an approach is realized in which a predetermined feed pressure is already provided on the low pressure side (first connection portion 5) of the pressing actuator (first pump 3), and as a result, the pressing is performed. The actuator 3 only needs to overcome the pressure difference. Suitable for this is an accumulator 15 which is filled according to the present invention so as to reach a predetermined feed pressure in a short distance from another pump (third pump 18) as needed. For convenience, the pump 18 may be a cooling oil pump that is alternately used for cooling / lubricating the variator and / or the starting member and for filling the accumulator 15 by switching appropriately. In this case, the fact that the thermal time constant of the starting member, such as the clutch, converter, etc., usually allows a short interruption of the cooling oil volume flow is utilized.

The first concept (first and second embodiments) is to temporarily disconnect the cooling oil pump 18 from the cooling circuit 19 and fill the accumulator 15 with the cooling oil pump 18 via the check valve 16 to achieve the target. A cooling oil valve (first fluid valve 22) is used to allow the pressure to be achieved. When the cooling valve 22 is open and the cooling oil pump 18 is in a low pressure operating state correspondingly, the check valve 16 prevents the pressure of the accumulator from being released into the cooling circuit 19. There is. Once the cooling oil pump 18 is unable to fill the accumulator 15 as expected, the press pump (second pump 4) still uses the check valve 16 in an emergency to ensure press. The pressure medium can be sucked in by itself. It is considered that the pressure sensor 33 for monitoring the accumulator filling state is convenient for the correct control of the cooling oil / filling pump 18.

The second concept (third and fourth embodiments) operates on the same principle, but in this case a reversible cooling oil pump 18 is used with the dual pressure valve 25. In one direction of rotation, the cooling oil pump 18 supplies to the cooling circuit 19, and in the other direction of rotation, the cooling oil pump 18 fills the accumulator 15 and sucks the pressure medium from the tank 6 in both cases. The pressing pump 4 is also capable of sucking the pressure medium from the tank 6 by itself in an emergency when the accumulator 15 is empty.

1 Fluid system 2 Winding transmission 3 1st pump 4 2nd pump 5 1st connection part of 1st pump 6 Reservoir 7 1st pipeline division 8 2nd connection part of 1st pump 9 1st disk set 10 1st actuator 11 1st connection of 2nd pump 12 2nd connection of 2nd pump 13 Disk set 14 2nd actuator 15 Accumulator 16 Shutoff valve 17th 1 connection area 18 3rd pump 19 Cooling medium and / or lubrication medium circulation circuit 20 1st connection part of 3rd pump 21 2nd connection part of 3rd pump 22 1st fluid valve 23 2nd Fluid valve 24 Cooling medium and / or Lubricating medium supply device 25 Dual pressure valve 26 Endless tension means 27a First electric motor 27b Second electric motor 27c Third electric motor 28 Second pipeline division 29 Second Connection area 30 Third pipeline division 31 Third connection area 32 Fourth pipeline division 33 Pressure sensor 34 Fourth connection area 35 Branch pipeline 36 Dual pressure valve inlet 37 Dual pressure valve first outlet 38 Second outlet of dual pressure valve 39 Check valve

Claims (9)

A fluid system (1) for a steplessly adjustable winding transmission (2), which comprises an electric motor-driven first pump (3) and an electric motor-driven second pump (4). The first connection portion (5) of the first pump (3) is connected to the pipeline division (7) leading to the reservoir (6), and the second of the first pump (3) is provided. The connection portion (8) is a first operating device (10) arranged corresponding to the first disk set (9) of the winding transmission (2) and the second pump (4). The second connection portion (12) of the second pump (4) is the second connection portion (12) of the winding transmission (2). In a fluid system (1) fluidly connected to a second actuating device (14) located corresponding to a disk set (13).
The first pump (3) is fluidly connected to the accumulator (15) on the side of the first connection portion (5) .
A shutoff valve (16) is inserted into the pipeline section (7) leading from the first connection portion (5) of the first pump (3) to the reservoir (6), and the accumulator (accumulator (6). The 15) is attached to the pipeline division (7) in the connection region (17) provided between the shutoff valve (16) and the first connection portion (5) of the first pump (3). A fluid system (1), characterized in that it is connected. The first of the first pump (3) via the conduit section (7) leading from the first connection (5) of the first pump (3) to the reservoir (6). a third pump capable of connected or connected to the connecting portion (5) (18) is provided, according to claim 1 Symbol placement of the fluid system (1). The shutoff valve (16) is inserted between the third pump (18) and the first pump (3), and a fluid flows from the third pump (18) to the connection region (17). The fluid system according to claim 2 , wherein the fluid system opens when flowing toward the third pump (18) and closes when the fluid flows from the connecting region (17) toward the third pump (18). (1). The fluid system (1) according to claim 2 or 3 , wherein the third pump (18) is connected to a cooling medium and / or a lubricating medium circulation circuit (19) of the winding transmission (2). The third pump (18) is formed as a pump having a fixed pumping direction, and the inlet connection portion (20) of the third pump (18) is connected to the reservoir (6). The outlet connection portion (21) of the third pump (18) is a line division (7) leading from the first connection portion (5) of the first pump (3) to the reservoir (6). ), The fluid system (1) according to any one of claims 2 to 4. The third pump (18) is operatively connected to a cooling medium and / or a lubricating medium supply device (24) via a valve (22) on the side of the outlet connection (21). 5 The fluid system (1). A fluid system (1) for a steplessly adjustable winding transmission (2), which comprises an electric motor-driven first pump (3) and an electric motor-driven second pump (4). The first connection portion (5) of the first pump (3) is connected to the pipeline division (7) leading to the reservoir (6), and the second of the first pump (3) is provided. The connection portion (8) is a first operating device (10) arranged corresponding to the first disk set (9) of the winding transmission (2) and the second pump (4). The second connection portion (12) of the second pump (4) is the second connection portion (12) of the winding transmission (2). In a fluid system (1) fluidly connected to a second actuating device (14) located corresponding to a disk set (13).
The first pump (3) is fluidly connected to the accumulator (15) on the side of the first connection portion (5).
The first of the first pump (3) via the pipeline section (7) leading from the first connection (5) of the first pump (3) to the reservoir (6). A third pump (18) connected to or connectable to the connection (5) is provided.
Said third pump (18) is reversibly formed with respect to its pumping direction, the flow body system (1). The fluid system (1) according to claim 7 , wherein the third pump (18) is connected to the reservoir (6) via a dual pressure valve (25). A stepless adjustable winding transmission (2) for an automobile power transmission system, the first disc set (9) and the second disc set (13), and any of claims 1 to 8 . The fluid system (1) according to claim 1 is provided, the first actuating device (10) is actuated and connected to the first disk set (9), and the second actuating device (14) is A steplessly adjustable winding transmission (2) that is operatively connected to the second disc set (13).

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