Oil guiding device for a transmission
By designing an oil guide device including a main oil passage, an offset part and a collection surface, the problems of complex oil guidance and large leakage losses in the prior art are solved, effective oil guidance and lubrication are achieved, and leakage losses are reduced.
Patent Information
- Application Number
- CN202411655307.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-20
- Filing Date
- 2024-11-19
- Publication Date
- 2025-05-20
AI Technical Summary
Existing oil guidance devices are difficult to achieve simple and effective oil guidance in complex transmissions, and pressurized oil can easily lead to leakage losses.
An oil guidance device is designed, including a fixing component and a collection component. Through the combination of the main oil passage, an offset part and an oil passage, the centrifugal force of the oil and the design of the collection surface are used to achieve effective guidance and distribution of the oil to ensure that the oil is fully guided to the required components.
The oil is achieved with simple and effective guidance, ensuring good lubrication of transmission components and reducing leakage losses.
Smart Images
Figure CN120020410A_ABST
Abstract
Description
Field of the Invention
[0001] The present invention relates to an oil guiding device for a transmission, a transmission for a vehicle, and a vehicle. Background Art
[0002] Known oil guiding devices supply oil to different components of a transmission for lubrication and cooling. In particular, in the case of a transmission including a bearing within a rotating shaft that rotatably supports an inner second rotating shaft, oil guiding is complex. In addition, pressurized oil results in leakage losses. Summary of the Invention
[0003] It is an object of the present invention to provide an improved oil guiding device that can guide oil in a simple manner, ensure good oiling of components, and keep leakage losses low.
[0004] This object is solved by an oil guiding device including the features of claim 1. Advantageous embodiments are the subject matter of the dependent claims.
[0005] The oil guiding device is applicable to a transmission having a first output shaft, a second output shaft, and a bearing of the first output shaft. The oil guiding device includes a fixed component. The fixed component can be formed by a housing. The fixed component forms a main oil passage. The main oil passage includes an opening. The opening can be arranged at one end of the main oil passage in the oil flow direction. The opening leads to an oil volume. The opening can be formed as an oil nozzle. The opening can be arranged in the axial direction. The axial direction can be referenced to the bearing of the first output shaft. The opening can be oriented obliquely with respect to the axial direction.
[0006] The second output shaft is rotatably supported at the fixed component. The second output shaft includes an offset portion. The offset portion extends in the radial direction. The radial direction can be referenced to the bearing of the first output shaft. The offset portion is arranged axially opposite to the opening of the main oil passage. In this regard, oil can flow from the opening in the direction of the offset portion. The first output shaft is rotatably supported at the second output shaft by means of a bearing. The offset portion forms an oil passage for the bearing of the first output shaft. The oil passage for the bearing of the first output shaft can be formed as a cylindrical hole. The oil passage for the bearing of the first output shaft extends in the axial direction. Thus, the centrifugal force on the oil can be kept low. The oil passage for the bearing of the first output shaft can, for example, extend radially outward. Thus, the centrifugal force can be used to convey oil to the bearing of the first output shaft. The oil passage for the bearing of the first output shaft can be formed obliquely with respect to the radial direction. The oil passage for the bearing of the first output shaft is fluidly connected to the bearing of the first output shaft. The oil passage for the bearing of the first output shaft is fluidly connected to the main oil passage via the oil volume.
[0007] If two components are in fluid communication with each other, fluid (such as oil) can be directed from one component to the other. In this case, the fluid communication can be arranged to be leak-free, such that the oil is directed substantially completely from one component to the other.
[0008] The oil flow direction is the direction of the oil in which the oil moves in the oil guiding device to reach the oiled component. In particular, the starting point of the oil passage is located upstream of the end of the oil passage in the oil flow direction.
[0009] In one embodiment, the offset portion of the second output shaft may cover the opening of the main oil passage in the radial direction. The offset portion may start within the opening in the radial direction and end outside the opening in the radial direction.
[0010] In one embodiment, the transmission may include a first bearing of the second output shaft and a second bearing of the second output shaft, and the first bearing of the second output shaft and the second bearing of the second output shaft rotatably support the second output shaft at a fixed component. The first bearing of the second output shaft and the second bearing of the second output shaft may each be formed as a needle bearing or a sliding bearing. An oil volume may be provided in the region between the first bearing of the second output shaft and the second bearing of the second output shaft.
[0011] The first bearing of the second output shaft and the second bearing of the second output shaft may be spaced apart from each other in the axial direction. The first bearing of the second output shaft and the second bearing of the second output shaft may be spaced apart from each other in the radial direction. Thus, an oil passage for the bearing of the first output shaft may be formed in the radial direction between the first bearing and the second bearing of the second output shaft. The oil volume may be provided in the axial direction between the first bearing of the second output shaft and the second bearing of the second output shaft. The oil volume may be provided in the radial direction between the first bearing of the second output shaft and the second bearing of the second output shaft. The oil volume may be bounded in the axial direction by the offset portion. The oil volume may be bounded by a part of the fixed component. The oil volume may be bounded by a part on the outer periphery of the second output shaft.
[0012] In one embodiment, the offset portion may be arranged between the bearing seats of the second output shaft for the first bearing and the second bearing of the second output shaft.
[0013] The second output shaft may include a bearing seat for the first bearing of the second output shaft and a bearing seat for the second bearing of the second output shaft. The bearing seats of the second output shaft may each be formed on the outer periphery of a part of the second output shaft. The fixed component may include a bearing seat for the first bearing of the second output shaft and a bearing seat for the second bearing of the second output shaft. In particular, the first bearing of the second output shaft and the second bearing of the second output shaft may each be arranged in the bearing seat in the gap between the second output shaft and the fixed component.
[0014] The offset portion can extend segmentally between the bearing seats of the second output shaft. The offset portion can extend in the radial direction. The offset portion can extend in the axial direction. The offset portion can extend in both the radial direction and the axial direction.
[0015] In one embodiment, the oil guiding device can include a collecting component. The collecting component can be arranged between the bearing seats of the first bearing and the second bearing for the second output shaft. The collecting component can extend segmentally between the bearing seats of the second output shaft. The collecting component can extend in the radial direction. The collecting component can extend in the axial direction. The collecting component can extend in both the radial direction and the axial direction.
[0016] In one embodiment, the collecting component can include a collecting surface which is configured such that the collecting surface collects oil radially outwards from the opening of the main oil passage and guides the oil axially to the oil passage for the bearing of the first output shaft.
[0017] The collecting surface can terminate close to the opening of the main oil passage such that the low oil pressure of the oil in the main oil passage is sufficient to convey the oil axially across the gap between the collecting surface and the opening of the main oil passage. The collecting surface can define an oil volume radially outwards. The collecting surface can cover the oil passage for the bearing of the first output shaft in the radial direction. The collecting surface can extend in a curved manner radially across the oil passage for the bearing of the first output shaft. The collecting surface can be rotationally symmetric. Together with the offset portion, the collecting surface can form a circumferentially extending groove which opens radially inwards.
[0018] In one embodiment, the collecting component can be configured such that the collecting component can be rotationally fixedly connected to the second output shaft. The collecting component can be rotationally fixedly connected to the second output shaft by means of a threaded connection. The collecting component can include a circumferentially extending undercut. The undercut can elastically hook onto a circumferentially extending projection of the second output shaft and be coupled to the second output shaft. The collecting component can be rotationally fixedly connected to the offset portion of the second output shaft.
[0019] If two elements are coupled to each other, the movement of one element causes a reaction in the other element. For example, the connection can be provided by a form-fit or a friction-fit connection. Additional elements can be provided between the elements. For example, the connection can be rotationally fixed. A rotationally fixed connection of two elements is understood to represent a connection in which the two elements are rigidly coupled to each other in all expected states of, for example, a transmission such that they exhibit substantially the same rotational speed. These elements can exist as separate components rotationally fixedly connected to each other or can also exist as an integral part.
[0020] In one embodiment, the collecting surface of the collecting component may overlap with the offset portion of the second output shaft. The collecting surface may cover a part of the offset portion in the radial direction. The collecting surface may protrude outwardly beyond the offset portion in the radial direction. The collecting surface may be arranged within the offset portion in the radial direction.
[0021] In one aspect, a transmission for a vehicle is provided. The transmission includes an input element, a first output shaft, a second output shaft, a first gear set, a second gear set, and an oil guiding device according to any one of the foregoing embodiments. The input element is configured to transmit torque to the first gear set. The first gear set and the second gear set are mechanically operably connected to each other such that torque can be transmitted from the first gear set to the second gear set. The first output shaft is configured to output torque from the first gear set. The second output shaft is configured to output torque from the second gear set. The first gear set and the second gear set may have the function of a differential.
[0022] In one embodiment, the first gear set may be formed by a first planetary gear set. The first planetary gear set may include a first sun gear, first planetary gears, and a first ring gear. The first sun gear may engage with the first planetary gears. The first planetary gears may engage with the first ring gear. The second gear set may be formed by a second planetary gear set. The second planetary gear set may include a second sun gear, second planetary gears, and a second ring gear. The second sun gear may engage with the second planetary gears. The second planetary gears may engage with the second ring gear. The first gear set and the second gear set may be arranged in the same plane in the axial direction.
[0023] In one aspect, a vehicle includes drive wheels and a transmission according to any one of the foregoing aspects and embodiments. The first output shaft is configured to drive one of the drive wheels. The second output shaft is configured to drive the other drive wheel. Description of the Drawings
[0024] Figure 1 A cross-sectional view showing a schematic representation of an embodiment of the oil guiding device.
[0025] Figure 2 A schematic representation showing an embodiment of a transmission having an oil guiding device. Detailed Description
[0026] Figure 1 A cross-sectional view showing a schematic representation of an embodiment of the oil guiding device. The oil guiding device is applicable to a transmission 3 having a first output shaft 5, a second output shaft 6, and a bearing 41 of the first output shaft 5. The following is referred to Figure 2The transmission 3 will be described in more detail. The oil guiding device includes a fixed member 60 and a collecting member 80. The second output shaft 6 forms an oil passage 91 for the bearing 41 of the first output shaft 5 that extends in the axial direction. As a result, oil can be guided to the bearing 41 of the first output shaft 5 in an almost pressureless manner.
[0027] Further details of the oil guiding device will be described in more detail below.
[0028] The second output shaft 6 is rotatably supported at the fixed member 60 by means of a first bearing 42 (in this case a grooved ball bearing). The second output shaft 6 is rotatably supported at the fixed member 60 by means of a second bearing 43 (in this case a needle bearing). The first bearing 42 of the second output shaft 6 and the second bearing 43 of the second output shaft 6 are arranged spaced apart from each other in the axial direction and in the radial direction. The first output shaft 5 is rotatably supported at the second output shaft 6 by means of a bearing 41. The first output shaft 5 and the second output shaft 6 are arranged coaxially with each other. A part of the first output shaft 5 is arranged within the second output shaft 6 in the radial direction and overlaps the second output shaft 6 in the axial direction.
[0029] The fixed member 60 forms a main oil passage 90. The end of the main oil passage 90 in the oil flow direction is formed as a hole extending in the axial direction. The main oil passage 90 includes an opening leading to an oil volume and formed as an oil nozzle. The oil volume is provided between the first bearing 42 of the second output shaft 6 and the second bearing 43 of the second output shaft 6.
[0030] The second output shaft 6 includes an offset portion 7 extending in the radial direction. The offset portion 7 is arranged between the bearing seats of the first bearing 42 and the second bearing 43 of the second output shaft 6 for the second output shaft 6. The offset portion 7 is configured as a step in this case. The offset portion 7 is arranged opposite to the opening of the main oil passage 90 in the axial direction. The offset portion 7 covers the opening of the main oil passage 90 in the radial direction.
[0031] A collecting member 80 is arranged between the bearing seats of the first bearing 42 and the second bearing 43 of the second output shaft 6. The collecting member 80 includes a collecting surface that is configured such that it collects oil radially outward from the opening of the main oil passage 90 and guides the oil axially to the oil passage 91 for the bearing 41 of the first output shaft 5. The collecting member 80 is rotationally fixedly connected to the second output shaft 6.
[0032] In this case, the collecting member 80 is connected to the outer circumference of a part of the second output shaft 6 by means of a clamping geometry and rotates together with the second output shaft 6 about the axis of rotation of the second output shaft 6. The collecting surface extends in a curved manner towards the inside in the radial direction in the region of the offset 7. The collecting surface together with the offset 7 forms a circumferentially extending groove which is open towards the inside in the radial direction. The collecting surface extends in the radial direction outside the opening of the main oil passage 90. The collecting member 80 delimits an oil volume in the radial direction. The end of the collecting member 80 in the radial direction is radially outwardly offset relative to the opening of the main oil passage 90 by an extent such that the oil discharged from the opening of the main oil passage 90 can be captured by the collecting member 80 in the radial direction.
[0033] The oil passage 91 for the bearing 41 of the first output shaft 5 is arranged to be radially outwardly offset from the opening of the main oil passage 90 in the offset 7. The oil passage 91 for the bearing 41 of the first output shaft 5 extends in the axial direction to the bearing 41 of the first output shaft 5. The oil passage 91 for the bearing 41 of the first output shaft 5 is formed by a hole.
[0034] The oil discharged from the opening of the main oil passage 90 flows towards the inside in the radial direction and meets the outer surface of the second output shaft 6. Due to the rotation of the second output shaft 6, the oil is guided radially outwards at the offset 7 until the oil meets the collecting member 80. The oil accumulates on the collecting member 80 until the oil has accumulated in the radial direction towards the inside to an extent such that the oil can flow out via the oil passage 91 of the bearing 41 of the first output shaft 5 under the accumulation pressure.
[0035] Figure 2 A schematic representation of an embodiment of a transmission 3 with an oil guiding device is shown. The transmission 3 includes an input element, a first output shaft 5, a second output shaft 6, a first gear set (in this case a first planetary gear set 10), a second gear set (in this case a second planetary gear set 20) and an oil guiding device according to the foregoing embodiment.
[0036] The first planetary gear set 10 includes: a first sun gear 11; a first planet carrier 12; a plurality of first planet bolts 13 and first planet gears 14; and a first ring gear 15. The first sun gear 11 engages with one of the first planet gears 14. One of the first planet gears 14 engages with the first ring gear 15 and is rotatably supported on one of the first planet bolts 13. The first planet bolts 13 are connected to the first planet carrier 12.
[0037] The second planetary gear set 20 includes: a second sun gear 21; a second planet carrier 22; a plurality of second planet bolts 23 and planet gears 24; and a second ring gear 25. The second sun gear 21 engages with one of the second planet gears 24. One of the second planet gears 24 engages with the second ring gear 25 and is rotatably supported on a second planet bolt 23. The second planet bolts 23 are connected to the second planet carrier 22. The second planet carrier 22 is connected to the fixed member 60.
[0038] The first ring gear 15 and the second sun gear 21 are formed by a sun-ring gear 30. The sun-ring gear 30 includes the first ring gear 15 on its inner circumference. The sun-ring gear 30 includes the second sun gear 21 on its outer circumference. The first planetary gear set 10 and the second planetary gear set 20 are arranged in the same plane in the axial direction.
[0039] The input member 4 is configured to transmit torque to the first sun gear 11. The torque can be transmitted from the first planetary gear set 10 to the second planetary gear set 20 by means of the sun-ring gear 30. The first output shaft 5 is rotationally fixedly connected to the first planet carrier 12 and transmits torque to the drive wheels 8 of the vehicle for driving the vehicle. The second output shaft 6 is rotationally fixedly connected to the second ring gear 25 and transmits torque to the drive wheels 8 of the vehicle for driving the vehicle.
[0040] Reference Numerals
[0041] 3 Transmission
[0042] 4 Input Member
[0043] 5 First Output Shaft
[0044] 6 Second Output Shaft
[0045] 7 Offset Portion
[0046] 8 Drive Gear
[0047] 10 First Planetary Gear Set
[0048] 11 First Sun Gear of the First Planetary Gear Set
[0049] 12 First Planet Carrier of the First Planetary Gear Set
[0050] 13 First Planet Bolt of the First Planetary Gear Set
[0051] 14 First Planet Gear of the First Planetary Gear Set
[0052] 15 First Ring Gear of the First Planetary Gear Set
[0053] 20 Second Planetary Gear Set
[0054] 21 Second sun gear of the second planetary gear set
[0055] 22 Second planet carrier of the second planetary gear set
[0056] 23 Second planet bolt of the second planetary gear set
[0057] 24 Second planet gear of the second planetary gear set
[0058] 25 Second ring gear of the second planetary gear set
[0059] 30 Sun ring gear
[0060] 41 Bearing of the first output shaft
[0061] 42 First bearing of the second output shaft
[0062] 43 Second bearing of the second output shaft
[0063] 60 Fixed part
[0064] 80 Collection part
[0065] 90 Main oil passage
[0066] 91 Oil passage for the bearing of the first output shaft.
Claims
1. An oil guiding device for a transmission (3), the transmission (3) having a first output shaft (5), a second output shaft (6) and a bearing (41) of the first output shaft (5), wherein the oil guiding device comprises a fixing part (60), wherein The first output shaft (5) is rotatably supported at the second output shaft (6) by means of the bearing (41), The fixed part (60) forms a main oil gallery (90) comprising an opening leading to an oil volume, The second output shaft (6) is rotatably supported at the fixing member (60), The second output shaft (6) includes an offset portion (7), the offset portion (7) extends in the radial direction, and the offset portion (7) is arranged opposite to the opening of the main oil gallery (90) in the axial direction, The offset portion (7) forms an oil passage (91) for the bearing (41) of the first output shaft (5), the oil passage (91) extending in the axial direction, and The oil passage (91) for the bearing (41) of the first output shaft (5) is fluidly connected to the main oil passage (90) via the oil volume.
2. The oil guiding device according to claim 1, characterized in that The offset portion (7) of the second output shaft (6) covers the opening of the main oil gallery (90) in the radial direction.
3. The oil guiding device according to claim 1 or 2, characterized in that The transmission (3) comprises a first bearing (42) of the second output shaft (6) and a second bearing (43) of the second output shaft (6), wherein the first bearing (42) of the second output shaft (6) and the second bearing (43) of the second output shaft (6) rotatably support the second output shaft (6) on the fixed component (60), wherein The oil volume is arranged in a region between a first bearing (42) of the second output shaft (6) and a second bearing (43) of the second output shaft (6).
4. The oil guiding device according to claim 3, characterized in that The offset portion (7) is arranged between bearing seats of the second output shaft (6) for a first bearing (42) and a second bearing (43) of the second output shaft (6).
5. The oil guiding device according to claim 3 or 4, characterized in that The oil guiding device comprises a collecting member (80) which is arranged between bearing seats of a first bearing (42) and a second bearing (43) for the second output shaft (6).
6. The oil guiding device according to claim 5, characterized in that The collecting member (80) includes a collecting surface configured such that the collecting surface collects oil from an opening of the main oil gallery (90) toward the outside in the radial direction and guides the oil in the axial direction to the oil gallery (91) for the bearing (41) of the first output shaft (5).
7. The oil guiding device according to claim 6, characterized in that The collecting member (80) is configured such that the collecting member (80) can be rotationally fixedly connected to the second output shaft (6).
8. The oil guiding device according to claim 6 or 7, characterized in that The collecting surface of the collecting member (80) overlaps with the offset portion (7) of the second output shaft (6).
9. A transmission (3) for a vehicle, the transmission (3) having an input element (4), a first gear set, a second gear set and an oil guiding device according to any one of the preceding claims, wherein The input element (4) is configured to transmit torque to the first gear set, The first gear set and the second gear set are mechanically operatively connected to each other so that torque can be transmitted from the first gear set to the second gear set. The first output shaft (5) is configured to output torque from the first gear set, and The second output shaft (6) is configured to output torque from the second gear set.
10. The transmission (3) according to claim 9, characterized in that The first gear set is formed by a first planetary gear set (10), and the second gear set is formed by a second planetary gear set (20).
11. A vehicle (1) having drive wheels (8) and a transmission (3) according to claim 9 or 10, wherein: The first output shaft (5) is configured to drive one of the drive wheels (8), and The second output shaft (6) is configured to drive the other of the drive wheels (8).