Parking lock device and drive arrangement having a parking lock device

Abstract

The invention relates to a parking lock device (10) for a drive arrangement having features of claim 1 and to a drive arrangement having such a parking lock device (10).

Description

[0001] Description

[0002] title

[0003] Parking lock device and a drive assembly with a parking lock device

[0004] State of the art

[0005] The invention relates to a parking lock device for a drive arrangement with features of claim 1 and a drive arrangement with such a parking lock device.

[0006] Parking lock devices are used to interrupt or release the torque transmission of a drive system. This enables a vehicle to be parked. The parking lock device typically includes a parking lock that can be actuated by a worm gear. The worm gear can be driven by an electric motor.

[0007] A disadvantage is that a separate electric motor is required to drive the worm gear. This increases the weight, cost, complexity, and required installation space of the parking lock system.

[0008] Disclosure of the invention

[0009] The invention proposes a parking lock device for a drive assembly of a motor vehicle. The parking lock device comprises a working chamber, a safety chamber, and a piston. The piston is designed to be movable between a closed position and an open position. In the closed position, torque transmission (by means of the parking lock device) is blocked. In the open position, torque transmission (by means of the parking lock device) is released. The piston is designed to be movable to the open position by filling the working chamber with liquid. The parking lock device includes a locking device. The locking device is designed to be movable from a locking position to a release position and / or vice versa. In the locking position, the piston is locked (by means of the locking device) in the closed position and / or in the open position.In the release position, the piston is released (by means of the locking device) in the closed position and / or the open position. The locking device can be moved into the release position by filling the safety chamber with fluid. The parking lock device comprises a first valve and a second valve. The first valve is a 3 / 2-way valve. The safety chamber is fluidically coupled to the first valve. The working chamber is fluidically coupled to the second valve.

[0010] This allows for a simpler, more cost-effective, lighter, and smaller parking lock system. A separate drive, especially a separate electric motor for the parking lock system, is no longer necessary. A simple, hydraulically controlled parking lock system can be implemented.

[0011] In this context, a fluidic connection or fluidic coupling means that a liquid (fluid, coolant, lubricant, oil, etc.) can flow between two fluidically coupled elements or between two elements in fluidic connection.

[0012] According to a further development of the parking lock device, the second valve can be designed as a 3 / 2-way valve. The second valve can be designed analogously to, and in particular identically to, the first valve.

[0013] This allows the second valve to be implemented using simple means.

[0014] According to a further development of the parking lock device, the second valve can be designed as a check valve.

[0015] This allows the second valve to be implemented using simple means. According to a further development of the parking lock device, the first valve can be designed to be movable from its first position to a second position and / or vice versa. In its first position, the first valve can fluidically couple the safety chamber to a liquid reservoir and block the flow of liquid into the safety chamber. In its second position, the first valve can release the flow of liquid into the safety chamber and fluidically decouple the safety chamber from the liquid reservoir.

[0016] This allows the safety chamber to be filled and / or emptied with liquid using simple means.

[0017] According to a further development of the parking lock device, the second valve can be designed to be movable from a third position to a fourth position and / or vice versa. In the third position, the second valve can fluidically couple the working chamber to the liquid reservoir and block the flow of liquid into the working chamber. In the fourth position, the second valve can release the flow of liquid into the working chamber and fluidically decouple the working chamber from the liquid reservoir.

[0018] This allows the work chamber to be filled and / or emptied with liquid using simple means.

[0019] According to a further development of the parking lock device, the parking lock device can include a first spring. The piston can be pre-tensioned into the closed position by means of the first spring.

[0020] This allows the piston to be moved into the closed position using simple means. In particular, no separate drive is required for this.

[0021] According to a further development of the parking lock mechanism, the locking device can include a second spring. The locking device can be pre-tensioned into the locking position by means of the second spring.

[0022] This allows the locking device to be moved into the locking position using simple means. In particular, no separate drive is required for this. According to the invention, a drive arrangement for a motor vehicle is proposed. The drive arrangement comprises at least one parking lock device as described above.

[0023] Regarding the advantages achievable with the drive arrangement, reference is made to the relevant explanations concerning the parking lock device. The measures described in connection with the parking lock device and / or those explained below can be used for further development of the drive arrangement.

[0024] The drive arrangement can, for example, be designed as an e-axle or form part of an e-axle.

[0025] According to a further development of the drive arrangement, the drive arrangement can include a cooling circuit with a coolant pump. The coolant pump can be configured to circulate coolant within the cooling circuit. The coolant pump can be configured to fill the working chamber and / or the safety chamber of the parking lock device with coolant. The coolant can serve as the (hydraulic) fluid for the parking lock device.

[0026] This allows the filling of the working chamber or the safety chamber, as well as the pumping of the coolant, to be implemented using simple means.

[0027] According to a further development of the drive arrangement, the coolant pump can be configured to pump coolant at at least two different delivery pressures. For this purpose, the coolant pump can be configured to pump coolant at two different delivery velocities.

[0028] This allows the second valve, designed as a check valve, to be opened or switched using simple means.

[0029] Embodiments of the invention are explained below with reference to the accompanying drawings. Figures 1 to 8 each schematically show a parking lock device according to a first embodiment in different states and

[0030] Figures 9 to 16 each schematically show the parking barrier device according to a second embodiment in different states.

[0031] In the following description and in the figures, corresponding components and elements are assigned the same reference symbols. For clarity, not all reference symbols are shown in every figure.

[0032] Figures 1 to 16 each schematically show a parking lock device 10 in different states. The parking lock device 10 is configured for a drive arrangement of a motor vehicle.

[0033] The parking lock device 10 comprises a working chamber 12, a safety chamber 14, and a piston 16. The piston 16 is designed to move between a closed position 18 and an open position 20. In the closed position 18, torque transmission (by means of the parking lock device 10) is blocked. In the open position 20, torque transmission (by means of the parking lock device 10) is released. The piston 16 is moved into the open position 20 by filling the working chamber 12 with liquid.

[0034] The parking lock device 10 can comprise a pawl and a parking lock wheel (not shown). The piston 16 can be coupled to or interact with the pawl and the parking lock wheel such that, in the closed position 18 of the piston 16, the pawl engages the parking lock wheel and prevents rotation of the parking lock wheel (and thus torque transmission). The piston 16 can be coupled to or interact with the pawl and the parking lock wheel such that, in the open position 20 of the piston 16, the pawl does not engage the parking lock wheel, allowing the parking lock wheel to rotate freely (and thus enabling torque transmission). The parking lock device 10 comprises a locking device 22. The locking device 22 is designed to be movable from a locking position 24 to a release position 26 and / or vice versa. In the locking position 24, the piston 16 is locked in the closed position 18 and / or in the open position 20.In release position 26, the piston 16 is released in the closed position 18 and / or in the open position 20. The locking device 22 is designed to be moved into release position 26 by filling the safety chamber 14 with liquid.

[0035] The parking lock device 10 comprises a first valve 28 and a second valve 30. The first valve 28 is designed as a 3 / 2-way valve. The safety chamber 14 is fluidically coupled to the first valve 28. The working chamber 12 is fluidically coupled to the second valve 30.

[0036] The first valve 28 and the second valve 30 can be fluidically coupled.

[0037] The first valve 28 can be configured to move from a first position 32 to a second position 34 and / or vice versa. In the first position 32, the first valve 28 can fluidically couple the safety chamber 14 to a liquid reservoir 36 and block the flow of liquid into the safety chamber 14. In the second position 34, the first valve 28 can release the flow of liquid into the safety chamber 14 and fluidically decouple the safety chamber 14 from the liquid reservoir 36.

[0038] The working chamber 12 and / or the safety chamber 14 can each be fluidically coupled to the liquid reservoir 36 via leaks and / or channels. The working chamber 12 and / or the safety chamber 14 can be emptied in this way, provided that no liquid flows into the working chamber 12 and / or the safety chamber 14.

[0039] The parking lock device 10 can include a first spring 42. The piston 16 can be pre-tensioned into the closed position 18 by means of the first spring 42.

[0040] The locking device 22 can include a second spring 44. The locking device 22 can be biased into the locking position 24 by means of the second spring 44. The locking device 22 can be arranged at least partially within the safety chamber 14. The locking device 22 can include a movable extension or bolt 23, which is biased by means of the second spring 44.

[0041] The piston 16 can be moved when the bolt 23 is moved against the spring force of the second spring 44 (downwards in Figures 1 to 16) by filling the safety chamber 14 with fluid and the locking device 22 is moved into the release position 26. Filling the safety chamber 14 increases the pressure inside the safety chamber 14 and exerts a hydraulic force on the bolt 23, which moves it downwards in Figures 1 to 16.

[0042] The piston 16 can have two recesses 33 into which the bolt 23 can engage when the piston 16 is in the closed position 18 or in the open position 20. For this to occur, the pressure in the safety chamber 14 must be reduced by emptying the safety chamber 14. This reduces the hydraulic force acting on the bolt 23, so that it can be moved upwards by the spring force of the second spring 44 in Figures 1 to 16 and, for example, engage in one of the recesses 33, thus locking the piston 16 in the closed position 18 or in the open position 20.

[0043] The parking lock device 10 can form part of a drive assembly for a motor vehicle. The drive assembly can include a cooling circuit with a coolant pump (not shown). The coolant pump can be configured to circulate coolant within the cooling circuit. The coolant pump can be configured to fill the working chamber 12 and / or the safety chamber 14 of the parking lock device 10 with coolant. The coolant can be used as the (hydraulic) fluid for the parking lock device 10. The coolant pump can be configured to circulate coolant at at least two different discharge pressures (and / or discharge rates).

[0044] Figures 1 to 8 each schematically show the parking lock device 10 according to a first embodiment in different states. The fluid flow, which is released or blocked by the first valve 28 or the second valve 30 respectively, is indicated in Figures 1 to 8 by a thick arrow.

[0045] The second valve 30 can be designed as a 3 / 2-way valve.

[0046] The second valve 30 can be configured to move from a third position 38 to a fourth position 40 and / or vice versa. In the third position 38, the second valve 30 can fluidically couple the working chamber 12 to the liquid reservoir 36 and block the liquid flow into the working chamber 12. In the fourth position 40, the second valve 30 can release the liquid flow into the working chamber 12 and fluidically decouple the working chamber 12 from the liquid reservoir 36.

[0047] The following describes, with reference to Figures 1 to 8, the movement of the piston 16 between the closed position 18 and the open position 20, or the activation and deactivation of the parking lock device 10 according to the first embodiment:

[0048] In Figure 1, the piston 16 is in the closed position 18 and the locking device 22 is in the locked position 24. The parking lock device 10 is thus activated, interrupting torque transmission via the parking lock device 10. The first valve 28 is in the first position 32 and thus connects the safety chamber 14 to the liquid reservoir 36. The second valve 30 is in the third position 38 and thus connects the working chamber 12 to the liquid reservoir 36. The working chamber 12 and the safety chamber 14 are therefore emptied.

[0049] To deactivate the parking lock device 10, the first valve 28 is moved to the second position 34. The safety chamber 14 is filled with liquid. The locking device 22 is thus moved to the release position 26. This is shown in Figure 2.

[0050] The second valve 30 is then moved to the fourth position 40. The working chamber 12 is filled with liquid. The piston 16 is thus moved to the open position 20. Since the locking device 22 is arranged in the release position 26, the movement of the piston 16 to the open position 20 is released or enabled. This is shown in Figure 3.

[0051] Once the piston 16 is in the open position 20, the first valve 28 is moved to the first position 32, so that the safety chamber 14 is fluidically coupled to the liquid reservoir 36. The liquid can now flow from the safety chamber 14 into the liquid reservoir 36. The pressure inside the safety chamber 14 decreases, and the locking device 22 is moved into the locking position 24, particularly due to the preload of the second spring 44. This is shown in Figure 4.

[0052] In Figure 5, the second valve 30 is moved to the third position 38, so that the working chamber 12 and the liquid reservoir 36 are fluidically coupled. The liquid can now flow from the working chamber 12 into the liquid reservoir 36.

[0053] Since the piston 16 is locked by means of the locking device 22, it remains in the open position 20 even when the liquid flows out of the working chamber 12.

[0054] To activate the parking lock device 10, the first valve 28 is moved to the second position 34. The safety chamber 14 is filled with liquid. This causes the locking device 22 to move to the release position 26. This is shown in Figure 6.

[0055] After the piston 16 is released by the locking device 22, the piston 16 moves into the closed position 18 due to the emptied working chamber 12 and the preload of the first spring 42. This is shown in Figure 7.

[0056] The first valve 28 is then moved to the first position 32, interrupting the flow of liquid to the safety chamber 14 and allowing the safety chamber 14 to be emptied. This, along with the preload of the second spring 44, moves the locking device 22 to the locking position 24, locking the piston 16 in the closed position 18. This is shown in Figure 8. The state of the parking lock device 10 in Figure 8 corresponds to the state of the parking lock device 10 in Figure 1. Figures 9 to 16 each schematically show the parking lock device 10 according to a second embodiment in different states. The liquid flow, which is released or blocked by the first valve 28 or the second valve 30, is indicated in Figures 9 to 16 by a thick arrow. The second embodiment differs from the first embodiment shown in Figures 1 to 8 in the following ways:

[0057] The second valve 30 can be designed as a check valve. The second valve 30 can be configured such that it blocks the flow of liquid at a first pressure (e.g., 3 bar) (the second valve 30 is closed) and releases the flow of liquid at a second pressure (e.g., 3.6 bar) that is greater than the first pressure (the second valve 30 is open).

[0058] The following describes, with reference to Figures 9 to 16, the movement of the piston 16 between the closed position 18 and the open position 20, or the activation and deactivation of the parking lock device 10 according to the second embodiment:

[0059] In Figure 9, the piston 16 is in the closed position 18 and the locking device 22 is in the locked position 24. The parking lock device 10 is thus activated, interrupting torque transmission via the parking lock device 10. The first valve 28 is in the first position 32 and thus connects the safety chamber 14 to the liquid reservoir 36. The second valve 30 blocks the liquid flow into the working chamber 12. The first pressure is applied to the first valve 28 and the second valve 30. The working chamber 12 and the safety chamber are empty.

[0060] To deactivate the parking lock 10, the first valve 28 is moved to the second position 34. The safety chamber 14 is filled with liquid. The locking device 22 is thereby moved to the release position 26. The first pressure is applied, i.e., the first pressure is applied to both valves 28 and 30. The second valve 30 therefore continues to block the flow of liquid into the working chamber 12. This is shown in Figure 10. Subsequently, the second pressure is applied. In other words, the second pressure is applied to both valves 28 and 30. The second valve 30 opens and releases the flow of liquid into the working chamber 12. The working chamber 12 is filled with liquid. The piston 16 is moved to the open position 20. Since the locking device 22 is in the release position 26, the movement of the piston 16 to the open position 20 is enabled. This is shown in Figure 11.

[0061] Once the piston 16 is in the open position 20, the first valve 28 is moved to the first position 32, so that the safety chamber 14 is fluidically coupled to the liquid reservoir 36. The liquid can now flow from the safety chamber 14 into the liquid reservoir 36. The pressure inside the safety chamber 14 decreases, and the locking device 22 is moved into the locking position 24, particularly due to the preload of the second spring 44. This is shown in Figure 12. The second valve 30 remains open because the second pressure is still present.

[0062] In Figure 13, the pressure is reduced or the initial pressure is reapplied. The second valve 30 then closes again, blocking the flow of liquid into the working chamber 12. The liquid can now flow out of the working chamber 12 into the liquid reservoir 36, for example, through leaks and / or channels. Since the piston 16 is locked by means of the locking device 22, it remains in the open position 20, even when the liquid flows out of the working chamber 12.

[0063] To activate the parking lock device 10, the first valve 28 is moved to the second position 34. The safety chamber 14 is filled with liquid. This causes the locking device 22 to move to the release position 26. Since the first pressure is still applied, the liquid flow to the working chamber 12 is blocked by the second valve 30. This is shown in Figure 14.

[0064] After the piston 16 is released by the locking device 22, the piston 16 moves into the closed position 18 due to the emptied working chamber 12 and the preload of the first spring 42. This is shown in Figure 15. Subsequently, the first valve 28 is moved to the first position 32, thus interrupting the fluid flow to the safety chamber 14. The locking device 22 is thereby moved into the locking position 24 due to this and the preload of the second spring 44, locking the piston 16 in the closed position 18. This is shown in Figure 16. The state of the parking lock device 10 in Figure 16 corresponds to the state of the parking lock device 10 in Figure 9.

Claims

Claims 1. Parking lock device (10) for a drive arrangement for a motor vehicle comprising: a working chamber (12), a safety chamber (14), a piston (16) wherein the piston (16) is movably configured to move between a closed position (18) and an open position (20), wherein in the closed position (18) a torque transmission is blocked and / or in the open position (20) the torque transmission is released, wherein the piston (16) is movably configured to move into the open position (20) by filling the working chamber (12) with liquid, a locking device (22) wherein the locking device (22) is configured to be transferable from a locking position (24) to a release position (26) and / or vice versa, wherein in the locking position (24) the piston (16) is locked in the closed position (18) and / or in the open position (20), wherein in the release position (26) the piston (16) is locked in the closed position (18) and / or in the open position (20) is released,wherein the locking device (22) is designed to be moved into the release position (26) by filling the safety chamber (14) with liquid, a first valve (28) wherein the safety chamber (14) is fluidically coupled to the first valve (28) wherein the first valve (28) is designed as a 3 / 2-way valve, a second valve (30) wherein the working chamber (12) is fluidically coupled to the second valve (30).

2. Parking lock device (10) according to claim 1 , characterized in that the second valve (30) is designed as a 3 / 2-way valve.

3. Parking lock device (10) according to claim 1 , characterized in that the second valve (30) is designed as a check valve.

4. Parking lock device (10) according to one of the preceding claims, characterized in that the first valve (28) is designed to be transferable from a first position (32) to a second position (34) and / or vice versa, wherein the first valve (28) in the first position (32) fluidically couples the safety chamber (14) with a liquid reservoir (36) and blocks a liquid flow into the safety chamber (14), wherein the first valve (28) in the second position (34) releases the liquid flow into the safety chamber (14) and fluidically decouples the safety chamber (14) from the liquid reservoir (36).

5. Parking lock device (10) according to the preceding claim, characterized in that the second valve (30) is designed to be transferable from a third position (38) to a fourth position (40) and / or vice versa, wherein the second valve (30) in the third position (38) fluidically couples the working chamber (12) with the liquid reservoir (36) and blocks the liquid flow into the working chamber (12), wherein the second valve (30) in the fourth position (40) releases the liquid flow into the working chamber (12) and fluidically decouples the working chamber (12) from the liquid reservoir (36).

6. Parking lock device (10) according to one of the preceding claims, characterized in that the parking lock device (10) comprises a first spring (42), wherein the piston (16) is biased into the closed position (18) by means of the first spring (42).

7. Parking locking device (10) according to one of the preceding claims, characterized in that the locking device (22) comprises a second spring (44), wherein the locking device (22) is biased into the locking position (24) by means of the second spring (44).

8. Drive arrangement for a motor vehicle comprising at least one parking lock device (10) according to one of the preceding claims.

9. Drive arrangement according to claim 8, characterized in that the drive arrangement comprises a cooling circuit with a coolant pump, wherein the coolant pump is configured to circulate coolant within the to promote the cooling circuit and to fill the working chamber (12) and / or the safety chamber (14) of the parking lock device (10) with coolant.

10. Drive arrangement according to claim 9, characterized in that the The coolant pump is designed to pump coolant at at least two different delivery pressures.

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