Lubrication system for a transmission

Abstract

A method of lubricating a transmission system includes recovering oil from at least one of a plurality of gears via a lubrication tube of a lubrication system disposed within the transmission system, directing the recovered oil from the lubrication tube to a plurality of oil conduits extending from the lubrication tube, and translating a shift pack in a longitudinal direction such that the shift pack actuates a plurality of poppet valve assemblies disposed in the plurality of oil conduits between a closed position and an open position. In the open position, the recovered oil bypasses the plurality of poppet valve assemblies, and in the closed position, the plurality of poppet valve assemblies form a seal with the plurality of oil conduits.

Description

Technical Field

[0001] This disclosure relates to lubrication systems for transmission systems, and more specifically to lubrication systems for automotive transmissions with integrated braking systems. Background Technology

[0002] In conventional transmission systems, the lubrication system can be configured to deliver oil to various components, including bearings and shift sleeves, via a central channel within the transmission shaft. However, in transmission systems where other components, such as the braking system, are integrated into the transmission shaft, the space typically used for oil delivery may be occupied. Because traditional lubrication systems rely on an unobstructed path through the transmission shaft to ensure a continuous and sufficient flow of oil to the bearings, integrating other components into the transmission can lead to insufficient lubrication, resulting in increased wear, reduced efficiency, and potential component failure. Summary of the Invention

[0003] According to one embodiment, a lubrication system for a transmission assembly is provided. The lubrication system may include a lubrication pipe, a plurality of oil conduits, a plurality of lift valve assemblies, and a shifting assembly. The plurality of oil conduits extend from and are in fluid communication with the lubrication pipe. At least one of the plurality of lift valve assemblies may be disposed in each of the plurality of oil conduits. The shifting assembly may include a shift shaft and a cam mechanism, the shift shaft being translatable in a longitudinal direction, and the cam mechanism being disposed about the shift shaft. The cam mechanism of the shifting assembly may be configured to engage each of the plurality of lift valve assemblies to actuate each of the plurality of lift valve assemblies between a closed position and an open position.

[0004] According to another embodiment, a transmission assembly is provided. The transmission assembly may include a transmission housing and a lubrication system disposed within the transmission housing. The transmission housing may define a transmission shaft that extends at least partially through the transmission housing. The lubrication system may include a lubrication line, a plurality of oil conduits, a plurality of lift valve assemblies, and a shifting assembly. At least one of the plurality of lift valve assemblies may be disposed in each of the plurality of oil conduits. The shifting assembly may be configured to translate relative to the plurality of oil conduits in a longitudinal direction. The shifting assembly may be configured to engage each of the plurality of lift valve assemblies to actuate each of the plurality of lift valve assemblies between a closed position and an open position.

[0005] According to yet another embodiment, a method for lubricating a transmission system is provided. The method may include: recovering oil from at least one of a plurality of gears via a lubrication pipe of a lubrication system disposed within the transmission system; guiding the recovered oil from the lubrication pipe to a plurality of oil conduits extending from the lubrication pipe; and translating a shifting assembly in a longitudinal direction such that the shifting assembly actuates a plurality of lift valve assemblies disposed in the plurality of oil conduits between a closed position and an open position. In the open position, the recovered oil can bypass the plurality of lift valve assemblies, and in the closed position, the plurality of lift valve assemblies form a seal with the plurality of oil conduits. Attached Figure Description

[0006] The embodiments illustrated in the accompanying drawings are illustrative and exemplary in nature and are not intended to limit the subject matter as defined by the claims. The following detailed description of exemplary embodiments will be understood when read in conjunction with the following drawings, wherein like structures are indicated by like reference numerals, and wherein:

[0007] Figure 1 This is a cross-sectional view of a transmission assembly according to one or more embodiments shown and described herein;

[0008] Figure 2 It is based on one or more embodiments shown and described herein. Figure 1 A schematic view of the lubrication system of the transmission assembly;

[0009] Figure 3 It is based on one or more embodiments shown and described herein. Figure 2 A cross-sectional view of the lift valve assembly of the lubrication system; and

[0010] Figure 4 It is based on one or more embodiments shown and described herein. Figure 1 A cross-sectional view of the lubrication system taken along section line 4-4;

[0011] Other features and advantages of this disclosure will be understood from the following embodiments described in detail herein and with reference to the accompanying drawings, in which the same reference numerals denote the same or similar parts. Detailed Implementation

[0012] In the embodiments described herein, a lubrication system for a transmission is disclosed. The lubrication system includes a lubrication tube in fluid communication with at least one of a plurality of gears, a plurality of oil conduits extending from and in fluid communication with the lubrication tube, a plurality of lift valve assemblies disposed in each of the plurality of oil conduits, and a shift assembly including a shift shaft translatably in a longitudinal direction and a cam mechanism disposed around the shift shaft. The cam mechanism of the shift assembly is configured to engage each of the plurality of lift valve assemblies to actuate each of the plurality of lift valves between a closed position and an open position. By utilizing the cam mechanism of the shift assembly to selectively translate the plurality of lift valve assemblies from a closed position to an open position (e.g., to facilitate lubrication of various gears and / or other components as needed during operation of the transmission), the disclosed lubrication system reduces oil waste while also addressing space issues arising from incorporating additional components (e.g., brake assemblies, etc.) into the transmission.

[0013] However, it should be understood that the disclosed embodiments are merely examples, and other embodiments may take various and alternative forms. The drawings are not necessarily to scale; some features may be exaggerated or minimized to show detail of particular components. Therefore, the specific structural and functional details disclosed herein should not be construed as limiting, but merely as a representative basis for teaching those skilled in the art to apply these embodiments in various ways. As will be appreciated by those skilled in the art, various features illustrated and described with reference to any of the drawings may be combined with features illustrated in one or more other drawings to produce embodiments not explicitly shown or described. The combinations of features shown provide representative embodiments for typical applications. However, various combinations and modifications of features consistent with the teachings of this disclosure may be desired for particular applications or implementations.

[0014] As used herein, “a,” “one,” and “the” refer to singular and plural indicators, respectively, unless the context clearly indicates otherwise. For example, a “processor” programmed to perform various functions means one processor programmed to perform each function, or more than one processor programmed together to perform each of the various functions.

[0015] As mentioned above, integrating various components such as braking systems into the spindle of a transmission system can block paths traditionally used by lubrication systems to deliver oil to bearings and other transmission components. Furthermore, existing lubrication systems may lack precise flow control, indiscriminately delivering oil to all potential paths, resulting in oil waste, reduced efficiency, and insufficient lubrication of various components within the transmission system.

[0016] The disclosed lubrication system aims to address these drawbacks by providing a lubrication system that recovers oil from the transmission gears and delivers the recovered oil to the transmission bearings and shifters via a series of oil conduits. Each oil conduit may be further equipped with a lift valve assembly that remains closed until actuated by a shift assembly (such as a shift sleeve), ensuring that oil is delivered only to the lubricated components within the transmission system. In the embodiments described herein, the shift assembly may further include a cam profile that engages multiple lift valve assemblies to ensure precise flow control for oil conservation while also providing effective lubrication to all moving parts within the transmission system.

[0017] It should be further understood that the lubrication system described herein can also address the space constraints introduced by integrating additional components (such as braking assemblies) into the transmission, while also improving the overall reliability and efficiency of the lubrication system. For example, by ensuring that lubrication is delivered only to the parts of the transmission system that require lubrication, the disclosed lubrication system minimizes oil waste, optimizes component performance, and extends the service life of the transmission system.

[0018] Embodiments of the lubrication system will now be described in more detail herein. These lubrication systems will be described in detail below with reference to the accompanying drawings, wherein the same reference numerals indicate the same structures.

[0019] Now for reference Figure 1 The image depicts a transmission assembly 10. The transmission assembly 10 may include a transmission housing 12 defining a transmission shaft 14, the transmission shaft 14 being in the longitudinal direction (e.g., in...). Figure 1 The transmission shaft 20 (in the + / -x direction depicted) extends at least partially through the transmission housing 12. In these embodiments, the braking assembly 20, such as a parking brake assembly including a drive motor system (e-axle), may be disposed within the transmission shaft 14 and extend through the transmission shaft 14.

[0020] like Figure 1 As further described herein, the transmission assembly 10 may also include a plurality of bearings 30 and a plurality of gears 32, which may be disposed within the transmission housing 12 relative to the transmission shaft 14. For example, in these embodiments, the transmission assembly 10 may include a plurality of transmission bearings, a plurality of shaft bearings, a plurality of brake bearings, and / or a plurality of shift assembly bearings, as referenced herein. Figure 2 and Figure 4 A more detailed description.

[0021] Still referencing Figure 1The transmission assembly 10 may further include a lubrication system 100, which may be positioned within the transmission housing 12 such that the lubrication system 100 is configured to recover oil from a plurality of gears 32 and distribute oil to a plurality of bearings 30 housed within the transmission assembly 10. For example, in these embodiments, the lubrication system 100 may be positioned in the longitudinal direction (e.g., in the case of...). Figure 1 Extending in the + / -x direction depicted on the coordinate axes, the lubrication system 100 operates at least partially parallel to the transmission shaft 14. Therefore, it should be understood that the lubrication system 100 can be positioned within the transmission housing 12 such that it can capture oil from the plurality of gears 32 while minimizing interference with other components of the transmission assembly 10 and / or braking assembly 20. Reference will be made below. Figure 2 The operation of the lubrication system 100 is described in more detail.

[0022] In the embodiments described herein, it should be further understood that the transmission assembly 10 may be an automotive transmission assembly, such as a transmission assembly used in electric vehicles, hybrid vehicles, or any other similar commercial vehicles. However, in some embodiments, without departing from the scope of this disclosure, the transmission assembly 10 may be used in industrial machinery (e.g., forklifts, conveyor systems, etc.), heavy equipment (e.g., excavators, bulldozers, cranes, etc.), aircraft, autonomous vehicles, or any other similar type of vehicle and / or machinery.

[0023] Now go to Figure 2 The lubrication system 100 is shown in more detail. For example, as... Figure 2 As shown, the lubrication system 100 may further include components along the transmission shaft 14 in the longitudinal direction (e.g., in the case of...). Figure 2 The lubrication pipe 110 extends in the + / -x direction (as depicted on the coordinate axes). In these embodiments, the lubrication pipe 110 may be in fluid communication (e.g., fluidly coupled or otherwise) with at least one of a plurality of gears 32 located within the transmission housing 12, such that oil used by the plurality of gears 32 can be recovered by the lubrication pipe 110 and redirected to other parts of the transmission assembly 10.

[0024] like Figure 2 As further described herein, the lubrication system 100 may further include a plurality of oil conduits 120 that can laterally extend from the lubrication pipe 110 (e.g., in a configuration such as...). Figure 2 The coordinate axes (in the + / -y direction) extend. In these embodiments, each of the plurality of oil conduits 120 may be in fluid communication with the lubrication conduit 110 (e.g., fluidly connected or otherwise), such that oil recovered from the plurality of gears 32 through the lubrication conduit 110 can be transferred to the plurality of oil conduits 120.

[0025] For example, in the embodiments described herein, the lubrication conduit 110 may be inclined to allow gravity-assisted oil to flow from the plurality of gears 32 to the plurality of oil conduits 120. In these embodiments, the lubrication conduit 110 may be inclined so that oil recovery from the plurality of gears 32 can be downward (e.g., in situations where...). Figure 2 The lubrication lines (in the -x and -y directions depicted on the coordinate axes) flow into each of the plurality of oil conduits 120. It should be understood that the inclination of the lubrication line 110 can help prevent oil buildup within the lubrication line 110, thereby allowing for a continuous supply of oil to the plurality of oil conduits 120. Furthermore, the inclination angle of the lubrication line 110 can be configured to balance the flow rate of the oil through the lubrication line 110 (e.g., gravity flow rate) without creating an excessive pressure drop. For example, in some embodiments, the inclination of the lubrication line 110 can be between 1 degree and 10 degrees, such as between 2 degrees and 5 degrees. Furthermore, in other embodiments, the lubrication line 110 may include a gradient inclination that increases and / or decreases along the length of the lubrication line 110, specifically determined based on the orientation of the lubrication system 100 within the transmission housing 12.

[0026] Still referencing Figure 2 The lubrication system 100 may further include a plurality of lift valve assemblies 130, such that at least one of the plurality of lift valve assemblies 130 is located within each of the plurality of oil conduits 120. For example, in such... Figure 2 In the depicted embodiments, the plurality of oil conduits 120 may include at least a first oil conduit 120a, a second oil conduit 120b, and a third oil conduit 120c. Similarly, the plurality of lift valve assemblies 130 may include at least a first lift valve 130a, a second lift valve 130b, and a third lift valve 130c. In these embodiments, the first lift valve 130a may be disposed within the first oil conduit 120a, the second lift valve 130b may be disposed within the second oil conduit 120b, and the third lift valve 130c may be disposed within the third oil conduit 120c. Although Figure 2 The lubrication system 100 depicted herein is shown to include three oil conduits and three lift valve assemblies; however, it should be understood that in some embodiments, the lubrication system 100 may include any number of oil conduits and lift valve assemblies without departing from the scope of this disclosure. Further reference will be made herein. Figure 3 The operation of the multiple lift valve assemblies 130 will be described in more detail.

[0027] Still referencing Figure 2The lubrication system 100 may further include a shift assembly 140, such as a shift sleeve, which may be configured to engage with a plurality of lift valve assemblies 130 and actuate the plurality of lift valve assemblies 130 between a closed position and an open position. In the closed position, each of the plurality of lift valve assemblies 130 may form a seal with at least one of a plurality of oil conduits 120 on which the lift valve assemblies are disposed. For example, as Figure 2 As shown, when the second lift valve 130b is in the closed position, it can form a seal with the second oil conduit 120b. Therefore, it should be understood that when the plurality of lift valve assemblies 130 are in the closed position, the seal formed between the plurality of lift valve assemblies 130 prevents oil from passing through the plurality of oil conduits 120, allowing oil to remain upstream of the plurality of lift valve assemblies 130 (e.g., in situations where...). Figure 2 (The coordinate axes depicted in the +y direction).

[0028] like Figure 2 As further described, contact between the shift assembly 140 and each of the plurality of lift valve assemblies 130 can actuate the plurality of lift valve assemblies 130 from a closed position to an open position. For example, when the plurality of lift valve assemblies 130 are actuated to the open position, oil upstream of the plurality of lift valve assemblies 130 can be allowed to flow downstream (e.g., in situations where...). Figure 2 The flow (in the -y direction depicted on the coordinate axes) passes through and / or around the multiple lift valve assemblies 130 to reach different parts of the transmission assembly 10 (e.g., bearings, gears, etc.), as will be described in more detail herein.

[0029] Now will be further referenced Figure 2 The operation of the shift assembly 140 is described in more detail. For example, in these embodiments, the shift assembly 140 may further include a shift shaft 142, which may be configured between multiple locations within the transmission assembly 10 in the longitudinal direction (e.g., in such a configuration). Figure 2 The coordinate axes depict translation and / or rotation in the + / -x directions, each of these positions corresponding to the position of each of the plurality of oil conduits 120 and each of the plurality of lift valve assemblies 130. In these embodiments, the shift assembly 140 may further include a cam mechanism 144 disposed on the shift shaft 142, which may be configured to engage each of the plurality of lift valve assemblies 130 when the shift shaft 142 translates in the longitudinal direction.

[0030] like Figure 2The profile of the cam mechanism 144, as depicted, can be configured such that contact between the cam mechanism 144 and each of the plurality of lift valve assemblies 130 drives the plurality of lift valve assemblies 130 to switch between a closed position and an open position. For example, the cam mechanism 144 can have a curved profile such that when the cam mechanism 144 translates to contact with each of the plurality of lift valve assemblies 130, the cam mechanism 144 can force each of the plurality of lift valve assemblies 130 to translate upward (e.g., in such a position as...). Figure 2 (In the +y direction depicted). In these embodiments, upward translation of each of the plurality of lift valve assemblies 130 can disengage the plurality of lift valve assemblies 130 from the plurality of oil conduits 120 in which the plurality of lift valve assemblies 130 are disposed, thereby allowing oil flow through the plurality of lift valve assemblies. Although Figure 2 The cam mechanism 144 is depicted as including a curved profile, but it should be understood that the cam mechanism 144 may have a profile of any shape that can actuate the plurality of lift valve assemblies 130 described herein.

[0031] In the embodiments described herein, it should be understood that the cam mechanism 144 of the shift assembly 140 can engage only a single lift valve assembly of the plurality of lift valve assemblies at a time. In other words, to engage the first lift valve 130a, the cam mechanism 144 can disengage the second lift valve 130b and the third lift valve 130c. Therefore, it should be understood that a single lift valve of the plurality of lift valve assemblies can be moved to the open position at a time, while the remaining lift valves of the plurality of lift valve assemblies can remain in the closed position.

[0032] Now for reference Figure 3 The document describes in more detail exemplary lift valves of a plurality of lift valve assemblies 130. For example, in the embodiments described herein, each of the plurality of lift valve assemblies 130 may include a body 132 defining a plunger 134. In these embodiments, the plunger 134 of the body 132 of each of the plurality of lift valve assemblies 130 may further include a tapered (e.g., bullnose, etc.) end 137 which may be configured to form a seal with an oil conduit 120 providing the lift valve assembly 130 when the lift valve assembly 130 is in the closed position.

[0033] like Figure 3 As further described, each of the plurality of lift valve assemblies 130 may further include a spring mechanism 136, such as a wave spring or any other similar spring, which can be configured to apply a constant force to the body 132 of each of the plurality of lift valve assemblies. In these embodiments, the force applied by the spring mechanism 136 can ensure that each of the plurality of lift valve assemblies 130 remains in the closed position when not in contact with the shift assembly 140 (e.g., so that the seal formed between the plunger 134 and the oil conduit 120 remains intact). Figure 3As further described, the spring mechanism 136 may be disposed between the body 132 and the lift valve gasket 138 of each of the plurality of lift valve assemblies 130, such that in the uncompressed state, the force applied by the spring mechanism 136 can keep each of the plurality of lift valve assemblies 130 in the closed position.

[0034] like Figure 3 As further depicted, each of the plurality of lift valve assemblies 130 may further include a pin 139, such as a roller pin, which may be configured to secure each of the plurality of lift valve assemblies 130 to the plurality of oil conduits 120. In these embodiments, the pin 139 may be a retaining pin, which may help ensure that the plurality of lift valve assemblies 130 do not rotate or disengage from the plurality of oil conduits 120 during operation of the drive assembly 10.

[0035] In the embodiments described herein, the body 132 and / or plunger 134 of each of the plurality of lift valve assemblies 130 may further include a plurality of pressure-reducing grooves 135 configured to allow oil to bypass the plurality of lift valves 130 when the plurality of lift valves are actuated to the open position. It should be understood that the plurality of pressure-reducing grooves 135 may be multiple grooves machined into the body 132 and / or plunger 134 of each of the plurality of lift valve assemblies 130 and may help to facilitate and guide oil flow to the various components of the transmission assembly 10, as will be described in more detail herein.

[0036] Now for reference Figure 4 A partial cross-sectional view of the lubrication system 100 is depicted, showing how oil can flow through the lubrication pipe 110 and multiple oil conduits 120. For example, as... Figure 4 As shown, the shift assembly 140 can further define the oil passage 150 so that when the plurality of lift valves 130 are actuated to the open position, oil can flow through the oil conduit 120 and through the oil passage 150 into the plurality of shift bearings 146. Although Figure 4 The oil passage 150 of the shift assembly 140 is depicted as directing oil to a plurality of shift bearings 146, but it should be understood that the oil passage 150 may be configured to direct oil to any component of the transmission assembly 10 without departing from the scope of this disclosure.

[0037] Now for joint reference Figures 1 to 4 The operation of the transmission assembly 10 and the lubrication system 100 will now be described in more detail. For example, in these embodiments, the lubrication line 110 can recover oil from at least one of the plurality of gears 32 located in the transmission housing 12. In these embodiments, the shift assembly 140 can disengage from the plurality of oil conduits 120 such that each of the plurality of lift valve assemblies is in the closed position.

[0038] When oil is recovered from at least one of the gears 32, the recovered oil can pass through the lubrication pipe 110 and be collected in each of the plurality of oil conduits 120 at an upstream location of each of the plurality of lift valve assemblies 130. It should be understood that during operation of the transmission assembly 10, oil can be continuously recovered from the plurality of gears 32 of the transmission assembly 10, so that oil can be continuously supplied to each of the plurality of oil conduits 120.

[0039] When the transmission assembly 10 is in operation, the shift assembly 140 can be engaged to actuate a plurality of lift valve assemblies 130 located in each of the plurality of oil conduits 120 from a closed position to an open position, such that oil accumulated upstream of the plurality of lift valve assemblies 130 can flow through the plurality of oil conduits 120 and be guided to various components of the transmission assembly 10, such as the plurality of shift bearings 146.

[0040] For example, the shift shaft 142 of the shift assembly 140 can be translated such that the cam mechanism 144 of the shift assembly 140 engages with the plunger 134 of the first lift valve 130a disposed within the first oil conduit 120a. In these embodiments, the force exerted by the cam mechanism 144 on the plunger 134 of the first lift valve 130a can compress the spring mechanism 136 of the first lift valve 130a by the body 132 of the first lift valve 130a, causing the first lift valve 130a to translate upward and move from a closed position to an open position. When the first lift valve 130a is open, oil accumulated upstream of the first lift valve 130a can flow downstream through the first oil conduit 120a. As the oil passes through the first oil conduit 120a, it can be diverted via the oil passage 150 to at least one of the plurality of shift bearings 146.

[0041] Still referencing Figures 1-4 When the shift shaft 142 translates to an adjacent position (e.g., a second position), the cam mechanism 144 of the shift assembly 140 can disengage the first lift valve 130a and engage the second lift valve 130b positioned in the second oil conduit 120b. In these embodiments, when the cam mechanism 144 disengages from the first lift valve 130a, the spring mechanism 136 can return to its initial (e.g., uncompressed) state, which allows the body 132 and plunger 134 of the first lift valve 130a to move downward from the open position to the closed position. When the first lift valve 130a moves to the closed position, the plunger 134 of the first lift valve 130a can engage the first oil conduit 120a, thereby forming a seal between the first lift valve 130a and the first oil conduit 120a. As the first lift valve 130a moves to the closed position, recovered oil through the lubrication line 110 can accumulate upstream, making the oil available for distribution via the first oil conduit 120a when the shift assembly 140 returns to its initial position.

[0042] It should be understood that when the shift assembly 140 is translated to engage each of the plurality of lift valve assemblies respectively, each of the plurality of lift valve assemblies 130 can translate between a closed position and an open position as described herein. Furthermore, during operation of the transmission assembly 10, the translation of the shift assembly 140 allows for continuous recovery and recirculation of oil from the plurality of gears 32 disposed within the transmission housing 12 to the at least plurality of shift bearings 146 formed in the shift assembly 140.

[0043] Still referencing Figures 1-4 It should be further understood that methods for lubricating transmission components using the lubrication system described herein are also considered within the scope of this disclosure. For example, in an embodiment, a method for lubricating a transmission component may include recovering oil from at least one of a plurality of gears 32 via a lubrication conduit 110 and directing the recovered oil from the lubrication conduit 110 to a plurality of oil conduits 120 extending from the lubrication conduit 110. As oil passes through the lubrication conduit 110 and accumulates within the plurality of oil conduits 120, the method may further involve translating a shift assembly 140 in the longitudinal direction such that the shift assembly 140 actuates a plurality of lift valve assemblies 130 disposed in the plurality of oil conduits 120 between a closed position and an open position.

[0044] When the shift assembly 140 engages the plurality of lift valve assemblies 130 and actuates the plurality of lift valve assemblies 130 to the open position, the recovered oil bypasses the plurality of lift valve assemblies. When the shift assembly disengages from the plurality of lift valve assemblies 130, the plurality of lift valve assemblies 130 can return to the closed position, in which the plurality of lift valve assemblies 130 form a seal with the plurality of oil conduits 120. In the embodiments described herein, it should be further understood that the method may further involve guiding the recovered oil from the plurality of oil conduits to the plurality of shift bearings formed within the shift assembly when at least one of the plurality of lift valve assemblies is moved to the open position.

[0045] In view of the foregoing, it should be understood that the embodiments described herein relate to transmission devices, lubrication systems for transmission devices including integrated components, and methods for lubricating transmission devices. While exemplary embodiments have been described above, it is not intended that these embodiments describe all possible forms covered by the claims. The terms used in this specification are descriptive rather than restrictive, and it should be understood that various changes may be made without departing from the spirit and scope of this disclosure. As previously stated, features of various embodiments may be combined to form further embodiments of the invention, which may not be explicitly described or shown. While various embodiments have been described as providing advantages with respect to one or more desired characteristics or being preferred relative to other embodiments or prior art implementations, those skilled in the art will recognize that one or more features or characteristics may be compromised to achieve desired overall system properties, depending on the specific application and implementation. These properties may include, but are not limited to, cost, strength, durability, life cycle cost, marketability, appearance, packaging, size, maintainability, weight, manufacturability, ease of assembly, etc. Accordingly, with respect to one or more features, these embodiments are outside the scope of this disclosure and may be desirable for a particular application to the extent that any embodiment is described as less desirable than other embodiments or prior art implementations.

Claims

1. A lubrication system for a transmission assembly, comprising: Lubrication pipe; Multiple oil conduits extend from and are in fluid communication with the lubrication tube; A plurality of lift valve assemblies, at least one of the plurality of lift valve assemblies being disposed in each of the plurality of oil conduits; as well as The shift assembly includes: The shift shaft is capable of translation in the longitudinal direction; and A cam mechanism, which is arranged around the shift shaft; The cam mechanism of the shift assembly is configured to engage each of the plurality of lift valve assemblies to actuate each of the plurality of lift valve assemblies between a closed position and an open position.

2. The lubrication system of claim 1, wherein in the closed position, each of the plurality of lift valve assemblies forms a seal with the plurality of oil conduits.

3. The lubrication system of claim 1, wherein the shifting assembly further defines an oil passage configured to direct oil from the plurality of oil conduits to the plurality of shift bearings.

4. The lubrication system of claim 1, wherein the cam mechanism includes a curved profile such that contact between the curved profile of the cam mechanism and each of the plurality of lift valve assemblies actuates the plurality of lift valve assemblies between the closed position and the open position.

5. The lubrication system of claim 1, wherein each of the plurality of lift valve assemblies includes a body having a tapered end.

6. The lubrication system of claim 1, wherein each of the plurality of lift valve assemblies includes a spring mechanism configured to secure the plurality of lift valve assemblies in the closed position.

7. The lubrication system of claim 1, wherein each of the plurality of lift valve assemblies further includes a pin configured to secure each of the plurality of lift valve assemblies within each of the plurality of oil conduits.

8. The lubrication system of claim 1, wherein each of the plurality of lift valve assemblies further comprises a plurality of grooves formed on the body of each of the plurality of lift valve assemblies.

9. A transmission device assembly, comprising: A transmission housing that defines a transmission shaft that extends at least partially through the transmission housing; A lubrication system, disposed within the housing of the transmission device, comprises: A lubrication pipe, which is in fluid communication with at least one of the plurality of gears; Multiple oil conduits extend from and are in fluid communication with the lubrication tube; A plurality of lift valve assemblies, at least one of the plurality of lift valve assemblies being disposed in each of the plurality of oil conduits; and The shifting assembly is longitudinally movable relative to the plurality of oil conduits; The shifting assembly is configured to engage each of the plurality of lift valve assemblies to actuate each of the plurality of lift valve assemblies between a closed position and an open position.

10. The transmission assembly according to claim 9, further comprising a braking assembly disposed within the transmission shaft.

11. The transmission assembly of claim 10, wherein the braking assembly further comprises a drive motor system (e-axle).

12. The transmission assembly of claim 9, wherein the lubrication pipe of the lubrication system extends at least partially parallel to the transmission shaft.

13. The transmission assembly of claim 9, wherein the shifting assembly comprises: The shift shaft is translatable in the longitudinal direction; as well as A cam mechanism, which is arranged around the shift shaft; The cam mechanism is configured to engage each of the plurality of lift valve assemblies.

14. The transmission assembly of claim 9, wherein in the open position, oil bypasses each of the plurality of lift valve assemblies, such that oil flows from the lubrication pipe to the shift assembly via the plurality of oil conduits.

15. The transmission assembly of claim 9, wherein each of the plurality of lift valve assemblies includes a body having a tapered end, such that when the plurality of lift valve assemblies are in the closed position, the tapered end of each of the plurality of lift valve assemblies forms a seal with each of the plurality of oil conduits.

16. The lubrication system of claim 9, wherein each of the plurality of lift valve assemblies includes a spring mechanism configured to hold the plurality of valve assemblies in the closed position.

17. The lubrication system of claim 9, wherein each of the plurality of lift valve assemblies further includes a pin configured to secure each of the plurality of lift valve assemblies within each of the plurality of oil conduits.

18. The lubrication system of claim 9, wherein each of the plurality of lift valve assemblies further comprises a plurality of grooves formed on the body of each of the plurality of lift valve assemblies.

19. A method for lubricating a transmission system, the method comprising: Oil from at least one of the multiple gears is recovered via a lubrication pipe provided in the lubrication system within the transmission system; The recovered oil is guided from the lubrication pipe to a plurality of oil conduits extending from the lubrication pipe; and The shifting assembly is translated in the longitudinal direction, so that the shifting assembly actuates the plurality of lift valve assemblies disposed in the plurality of oil conduits between the closed position and the open position; In the open position, the recovered oil bypasses the plurality of lift valve assemblies, and in the closed position, the plurality of lift valve assemblies form a seal with the plurality of oil conduits.

20. The method of claim 19, further comprising translating the plurality of lift valve assemblies from the closed position to the open position, and guiding the recovered oil from the plurality of oil conduits to a plurality of shift bearings formed within the shift assembly.

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