Two-way oil collection lubrication system for gearboxes

Abstract

A bidirectional oil collection and lubrication system for a transmission, relating to the field of transmission technology, is disclosed to address the technical problem of limited lubrication medium transmission paths caused by the spatial layout of transmission bearings in existing technologies. The bidirectional oil collection and lubrication system for the transmission employs a phase-symmetrically arranged bidirectional oil collection pipe assembly, achieving three-dimensional capture of lubricating oil through a centrifugal pressure field generated by the rotation of the gear pair; it integrates a fan-shaped differential pressure valve with steering response characteristics, and the valve core assembly consists of a wave spring and a stepped pressure plate forming a dynamic sealing pair to achieve pressure compensation control; through the bidirectional lubrication path of the bidirectional oil collection pipe assembly, a forced lubrication flow field is established based on the gear pump effect, and boundary lubrication compensation for the moving pairs is achieved through a capillary adsorption structure.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, and in particular to a bidirectional oil collection and lubrication system for gearboxes. Background Technology

[0002] Currently, in the integrated development of modern transmissions, space constraints and thermal management requirements present a sharp contradiction. Due to the overall vehicle layout geometry, critical transmission bearing components (including intermediate shafts or input / output shafts) are often forced to be located outside the lubrication interface, resulting in typical boundary lubrication failure scenarios.

[0003] This non-ideal layout results in the rotating pair facing three lubrication barriers under operating conditions: (1) the oil passage cutoff effect caused by structural topology constraints; (2) the oil mist shielding phenomenon generated by the gear pair movement; and (3) capillary penetration failure caused by insufficient wetting gradient. The resulting heat load accumulation will trigger a chain failure mode such as bearing raceway micro-pitting and cage thermal deformation. Actual test data show that the friction torque fluctuation under such conditions can reach 3-5 times that under normal lubrication conditions, eventually evolving into the risk of galling failure, becoming the main bottleneck restricting the durability of the transmission.

[0004] Therefore, how to provide a bidirectional oil collection and lubrication system for gearboxes, which can build an adaptive lubricating oil transport mechanism under all working conditions by integrating bidirectional oil collection pipes and speed-responsive fan blade valve core components, combined with a wave spring dynamic sealing structure, has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this utility model is to provide a bidirectional oil collection and lubrication system for a transmission, which solves the technical problem in the prior art where the transmission path of the lubricating medium is limited due to the spatial layout of the transmission bearing (that is, the traditional one-way oil collection and lubrication system of the transmission has the defect of adaptability to steering conditions, and it can only achieve effective oil collection in the preset rotation direction).

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A bidirectional oil collection and lubrication system for a gearbox employs a phase-symmetrically arranged bidirectional oil collection pipe assembly. It achieves three-dimensional capture of lubricating oil through a centrifugal pressure field generated by the rotation of the gear pair. An integrated fan-shaped differential pressure valve with steering response characteristics is included, and the valve core assembly consists of a wave spring and a stepped pressure plate forming a dynamic sealing pair to achieve pressure compensation control. Through the bidirectional lubrication path of the bidirectional oil collection pipe assembly, a forced lubrication flow field is established based on the gear pump effect, and boundary lubrication compensation for the moving pairs is achieved through a capillary adsorption structure.

[0008] The bidirectional oil collecting pipe assembly includes: a bidirectional oil collecting pipe body, which serves as the core carrier, with a wave spring coaxially sleeved on the outside; a fan blade valve core is dynamically connected to the bidirectional oil collecting pipe body via a connecting cylindrical pin, and the connecting cylindrical pin passes through the shaft hole of the fan blade valve core and forms a pivot connection mechanism with the mounting hole of the bidirectional oil collecting pipe body; the pin connection structure of the bidirectional oil collecting pipe body and the fan blade valve core cooperates to realize the bidirectional linkage function of the valve core and the oil collecting pipe;

[0009] The bidirectional oil collecting pipe assembly is positioned and connected to the housing through the oil collecting pipe pressure plate, and the two evenly distributed fixing bolts are finally tightened according to the symmetrical progressive torque method to ensure uniform pressure distribution on the flange surface.

[0010] In practical applications, the bearing to be lubricated is embedded into the housing through a press-fit process to form a static fit structure; the drive gear assembly is assembled by the drive gear and the drive gear bearing to form a kinematic pair; the drive gear assembly is vertically assembled to the housing.

[0011] During operation, the tooth surface of the drive gear forms a continuous dynamic oil film with a thickness of 1 mm due to the agitation of the lubricating oil. The bidirectional oil collection pipe body, which is fixed to the housing by the oil collection pipe pressure plate and the fixing bolt, maintains constant contact with the tooth surface of the drive gear under the elastic preload of the wave spring.

[0012] Specifically, under the high-speed rotation of the drive gear, the lubricating oil film on the tooth surface exhibits dynamic renewal characteristics. Subsequent oil, through hydrodynamic pressure effect, pushes the preceding oil to migrate into the interior of the bidirectional oil collection pipe body to form a stable directional flow. The fan-blade valve core, hinged to the bidirectional oil collection pipe assembly by the connecting cylindrical pin, deflects under oil pressure. While forming an oil passage on the opening side, it achieves hydraulic self-locking on the reverse side to effectively establish a unidirectional conduction mechanism.

[0013] Furthermore, the collected lubricating oil is directionally transported through the pre-set built-in oil channel network of the housing, and finally guided to the friction pair interface of the bearing to be lubricated.

[0014] Compared with the prior art, the bidirectional oil collection and lubrication system for gearboxes described in this utility model has the following advantages:

[0015] This invention provides a bidirectional oil collection and lubrication system for transmissions. By optimizing the geometry and hydrodynamic characteristics of the lubrication channels, a circulating oil circuit with directional flow guidance is constructed within the transmission housing. This effectively solves the lubrication failure problem caused by significant height differences or horizontal misalignments between the bearing mounting positions and the oil surface in traditional transmissions, thereby significantly improving the oil film formation capability and thermal load-bearing performance of key moving parts. Finite element flow field simulation has verified that this bidirectional oil collection and lubrication system maintains effective lubrication efficiency even under ±30° tilt angle conditions. Its axial space occupancy is reduced by 40% compared to traditional structures, making it particularly suitable for compact transmissions with multiple shafts arranged in a cross configuration. Attached Figure Description

[0016] Figure 1 A first-view structural schematic diagram of a bidirectional oil collection and lubrication system for a gearbox provided in an embodiment of this utility model;

[0017] Figure 2 A second structural schematic diagram of a bidirectional oil collection and lubrication system for a gearbox provided in an embodiment of this utility model;

[0018] Figure 3 This is a schematic diagram of the bidirectional oil collection pipe assembly in a bidirectional oil collection lubrication system for a gearbox, provided as an embodiment of the present invention.

[0019] Figure label:

[0020] 1-Bidirectional oil collection pipe body; 2-Fan blade valve core; 3-Connecting cylindrical pin; 4-Wave spring; 5-Oil collection pipe pressure plate; 6-Drive gear; 7-Drive gear bearing; 8-Housing; 9-Bearing to be lubricated; 10-Fixing bolt. Detailed Implementation

[0021] For ease of understanding, the bidirectional oil collection and lubrication system for a gearbox provided in the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0022] This utility model embodiment provides a bidirectional oil collection and lubrication system for a gearbox, such as... Figures 1-3 As shown, a bidirectional oil collection pipe assembly with phase symmetry is adopted, and the three-dimensional capture of lubricating oil is achieved through the centrifugal pressure field formed by the rotation of the gear pair; an integrated fan-shaped differential pressure valve with steering response characteristics is used, and the valve core assembly is composed of a wave spring and a stepped pressure plate to form a dynamic sealing pair to achieve pressure compensation control within a certain range; through the bidirectional lubrication path of the bidirectional oil collection pipe assembly, a forced lubrication flow field is established by relying on the gear pump effect, and boundary lubrication compensation for key moving pairs is achieved through capillary adsorption structure;

[0023] The bidirectional oil collection pipe assembly includes: a bidirectional oil collection pipe body 1, which serves as the core carrier, with a wave spring 4 coaxially sleeved on the outside; a fan blade valve core 2, which establishes a dynamic connection with the bidirectional oil collection pipe body 1 through a connecting cylindrical pin 3, and the connecting cylindrical pin 3 passes through the shaft hole of the fan blade valve core 2 and forms a pivot connection mechanism with the mounting hole of the bidirectional oil collection pipe body 1; the pin connection structure of the bidirectional oil collection pipe body 1 and the fan blade valve core 2 cooperates to realize the bidirectional linkage function of the valve core and the oil collection pipe;

[0024] The bidirectional oil collection pipe assembly 1 is positioned and connected to the housing 8 through the oil collection pipe pressure plate 5, and the two evenly distributed fixing bolts 10 are finally tightened according to the symmetrical progressive torque method to ensure uniform pressure distribution on the flange surface.

[0025] Compared with the prior art, the bidirectional oil collection and lubrication system for gearboxes described in this embodiment of the invention has the following advantages:

[0026] The bidirectional oil collection and lubrication system for transmissions provided in this embodiment of the invention optimizes the geometry and hydrodynamic characteristics of the lubrication channels, constructing a circulating oil circuit with directional flow guidance within the transmission housing. This effectively solves the lubrication failure problem caused by significant height differences or horizontal misalignments between the bearing mounting positions and the oil surface in traditional transmissions, thereby significantly improving the oil film formation capability and thermal load-bearing performance of key moving parts. The bidirectional oil collection and lubrication system for transmissions provided in this embodiment of the invention, verified by finite element flow field simulation, maintains effective lubrication efficiency even under ±30° tilt angle conditions. Its axial space occupancy is reduced by 40% compared to traditional structures, making it particularly suitable for compact transmissions with multiple shafts arranged in a cross configuration.

[0027] In other words, the bidirectional oil collection and lubrication system for a gearbox provided in this embodiment of the invention employs a pin-shaft hinge mechanism between the bidirectional oil collection pipe body 1 and the fan-blade valve core 2 to construct a fan-blade type differential pressure regulation system with dynamic adaptive characteristics. Based on the gear pump effect and the synergistic effect of the internal flow channel of the housing 8, the directional and stable delivery of the lubricating medium is achieved through a fluid dynamic self-balancing mechanism. This ensures that the boundary lubrication film thickness of the lubricated gear pair can be accurately maintained under various complex working conditions (including forward / reverse gear switching, slope changes, and load fluctuations), thereby effectively avoiding lubrication failure under extreme working conditions. The compact and lightweight design reduces the overall weight by more than 40% compared to traditional lubrication systems, achieving stress-free integration with the gearbox body structure. The modular assembly design greatly improves the ease of installation, and the system relies entirely on its own fluid power to achieve the working cycle without the need for an external power source, making it particularly suitable for the lubrication guarantee needs of high power density transmission systems.

[0028] In practical applications, such as Figures 1-3As shown, the bearing 9 to be lubricated is embedded into the housing 8 by a press-fit process to form a static fit structure; the drive gear assembly is assembled by the drive gear 6 and the drive gear bearing 7 to form a kinematic pair; the drive gear assembly is vertically assembled to the housing 8.

[0029] Among them, such as Figures 1-3 As shown, when the drive gear 6 is running, a continuous dynamic oil film with a thickness of 1mm will be formed on the tooth surface due to the agitation of the lubricating oil. The bidirectional oil collection pipe body 1, which is fixed to the housing 8 by the oil collection pipe pressure plate 5 and the fixing bolt 10, maintains constant contact with the tooth surface of the drive gear 6 under the elastic preload of the wave spring 4, thereby effectively ensuring that the oil inlet of the oil collection pipe can accurately capture the oil film on the tooth surface and realize the continuous oil scraping function.

[0030] Specifically, such as Figures 1-3 As shown, under the high-speed rotation of the drive gear 6, the lubricating oil film on the tooth surface exhibits dynamic renewal characteristics. The subsequent oil pushes the preceding oil to migrate into the interior of the bidirectional oil collection pipe body 1 through the hydrodynamic pressure effect, so as to form a stable directional flow. The fan-blade valve core 2, which is hinged to the bidirectional oil collection pipe assembly by the connecting cylindrical pin 3, deflects under the action of oil pressure. While forming an oil passage on the opening side, it achieves hydraulic self-locking on the reverse side, so as to effectively establish a one-way conduction mechanism.

[0031] Furthermore, such as Figures 1-3 As shown, the collected lubricating oil is directionally transported through the built-in oil channel network preset in the housing 8, and finally guided to the friction pair interface of the bearing 9 to be lubricated; the closed-loop lubrication system can not only ensure the continuous supply of bearing lubricant, but also fundamentally eliminate the risk of excessive temperature rise and bearing failure caused by poor lubrication.

[0032] In summary, the bidirectional oil collection and lubrication system for gearboxes provided by this utility model embodiment has the following main advantages:

[0033] I. Applicable to solving bearing lubrication problems under various complex working conditions (including forward / reverse gear switching, slope changes and load fluctuations, etc.);

[0034] Second, it has a directional flow guidance function and does not need to consider the oil passage cutoff effect caused by structural topology constraints.

[0035] Third, the overall structure is simple, easy to arrange, and occupies little space.

[0036] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A bidirectional oil collection and lubrication system for a gearbox, characterized in that, The system employs a phase-symmetrical bidirectional oil collection pipe assembly, which achieves three-dimensional capture of lubricating oil through the centrifugal pressure field generated by the rotation of the gear pair. It integrates a fan-shaped differential pressure valve with steering response characteristics, and the valve core assembly consists of a wave spring and a stepped pressure plate forming a dynamic sealing pair to achieve pressure compensation control. Through the bidirectional lubrication path of the bidirectional oil collection pipe assembly, a forced lubrication flow field is established based on the gear pump effect, and boundary lubrication compensation for the moving pair is achieved through a capillary adsorption structure. The bidirectional oil collecting pipe assembly includes: a bidirectional oil collecting pipe body, which serves as the core carrier, with a wave spring coaxially sleeved on the outside; a fan blade valve core is dynamically connected to the bidirectional oil collecting pipe body via a connecting cylindrical pin, and the connecting cylindrical pin passes through the shaft hole of the fan blade valve core and forms a pivot connection mechanism with the mounting hole of the bidirectional oil collecting pipe body; the pin connection structure of the bidirectional oil collecting pipe body and the fan blade valve core cooperates to realize the bidirectional linkage function of the valve core and the oil collecting pipe; The bidirectional oil collecting pipe assembly is positioned and connected to the housing through the oil collecting pipe pressure plate, and the two evenly distributed fixing bolts are finally tightened according to the symmetrical progressive torque method to ensure uniform pressure distribution on the flange surface.

2. The bidirectional oil collection and lubrication system for a gearbox according to claim 1, characterized in that, The bearing to be lubricated is embedded into the housing by a press-fit process to form a static fit structure; the drive gear assembly is assembled by the drive gear and the drive gear bearing to form a kinematic pair; the drive gear assembly is vertically assembled to the housing.

3. The bidirectional oil collection and lubrication system for a gearbox according to claim 2, characterized in that, During operation, the tooth surface of the drive gear will form a continuous dynamic oil film with a thickness of 1mm due to the agitation of the lubricating oil. The bidirectional oil collection pipe body, which is fixed to the housing by the oil collection pipe pressure plate and the fixing bolt, maintains constant contact with the tooth surface of the drive gear under the elastic preload of the wave spring.

4. The bidirectional oil collection and lubrication system for a gearbox according to claim 3, characterized in that, Under the high-speed rotation of the drive gear, the lubricating oil film on the tooth surface exhibits dynamic renewal characteristics. Subsequent oil is driven by the hydrodynamic effect to migrate the preceding oil into the interior of the bidirectional oil collection pipe body, thereby forming a stable directional flow. The fan-blade valve core, which is hinged to the bidirectional oil collection pipe assembly by the connecting cylindrical pin, deflects under oil pressure. While forming an oil passage on the opening side, it achieves hydraulic self-locking on the reverse side, thereby effectively establishing a unidirectional conduction mechanism.

5. The bidirectional oil collection and lubrication system for a gearbox according to claim 4, characterized in that, The collected lubricating oil is directionally transported through the pre-set built-in oil channel network of the housing, and finally guided to the friction pair interface of the bearing to be lubricated.

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