A kind of intermediate housing for gearbox

Abstract

The utility model provides a kind of intermediate shell for gearbox, the intermediate shell is located between gearbox shell and front shell, it include: shell body, the shell body is formed with pressure lubricating oil channel, the pressure lubricating oil channel is used to guide lubricating oil to the lubrication area in gearbox;The pressure lubricating oil channel includes main oil circuit for accessing pressure oil source, and at least one branch oil circuit is divided from the main oil circuit, the end of the branch oil circuit is equipped with injection hole.The utility model can accurately solve the technical problem that conventional splashing lubrication mode is difficult to effectively lubricate high gear, by being equipped with pressure lubricating oil channel on shell body, it includes main oil circuit and multiple branch oil circuits, forms directional lubrication, realizes the accurate lubrication and cooling of high gear meshing place, high bearing, completely avoids lubrication failure and overheating risk under high speed high load condition.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, and in particular to an intermediate housing for a gearbox. Background Technology

[0002] With the continuous development of the automotive industry, hybrid off-road vehicles are increasingly favored by the market due to their low energy consumption, intelligence and excellent off-road performance. As the core component of hybrid vehicles, the performance and reliability of the longitudinal hybrid transmission are of paramount importance.

[0003] Reliable lubrication and cooling of gears inside the transmission are crucial to its stable operation. Currently, the traditional splash lubrication method is commonly used for lubricating and cooling transmission gears. Specifically, the high-speed rotating main reduction gear inside the transmission agitates the lubricating oil in the oil pan, causing the lubricating oil to splash up and thus lubricate the meshing surfaces of the gears, bearings, and other parts. In some transmissions, oil baffles or oil baffles are also installed to guide the splashed oil.

[0004] However, when the aforementioned traditional splash lubrication method is applied to longitudinally mounted hybrid transmissions, it usually cannot effectively meet the cooling and lubrication requirements of the high-mounted gears in the longitudinal transmission. Specifically, firstly, in longitudinally mounted transmissions, some gears, such as high-speed gears or motor drive gears, are installed at a high position due to structural layout requirements, and are far from the oil level in the oil pan. The splashed oil cannot effectively and stably reach the meshing area, resulting in insufficient lubrication and poor cooling effect. This makes the high-mounted gears face the risk of lubrication failure and overheating under high-speed and high-load conditions, which seriously affects the performance of the transmission. Utility Model Content

[0005] Based on this, the purpose of this utility model is to provide an intermediate housing for a gearbox, which aims to solve the technical problem that the traditional splash lubrication method cannot effectively meet the cooling and lubrication requirements of the high gear in the longitudinal hybrid gearbox when applied, so that the high gear faces the risk of lubrication failure and overheating under high speed and high load conditions, which seriously affects the performance of the gearbox.

[0006] The purpose of this utility model is to provide an intermediate housing for a gearbox, wherein the intermediate housing is disposed between the gearbox housing and the front housing, and includes: The housing body has a pressure lubrication channel formed therein, which is used to guide lubricating oil to the area to be lubricated in the gearbox. The pressure lubrication oil passage includes a main oil passage for connecting to a pressure oil source, and at least one branch oil passage branched off from the main oil passage, with a spray hole at the end of the branch oil passage.

[0007] In addition, the intermediate housing for the gearbox according to the present invention may also have the following additional technical features: Furthermore, the housing body is provided with an oil pipe interface that communicates with the main oil circuit. The oil pipe interface is used to install one end of the oil supply pipe, and the other end of the oil supply pipe communicates with the internal oil passage of the gearbox housing.

[0008] Furthermore, at least one of the injection holes is equipped with a throttle valve for regulating the flow rate of lubricating oil.

[0009] Furthermore, the branch oil circuit includes a first branch oil circuit, a second branch oil circuit, and a third branch oil circuit leading to different lubrication parts. The first branch oil circuit has a first throttle valve in its injection hole, and the second branch oil circuit has a second throttle valve in its injection hole.

[0010] Furthermore, the housing body is also provided with a bearing mounting hole for mounting a bearing, and an oil collection groove communicating with the bearing mounting hole is provided on one side of the bearing mounting hole, the oil collection groove extending radially along the bearing mounting hole.

[0011] Furthermore, the housing body is also provided with a bearing mounting post, and the connection between the bearing mounting post and the housing body is provided with a concave rounded corner structure; The bearing mounting post is provided with an internally threaded hole extending along its height direction. A first bolt passes through the front housing and is threaded into the internally threaded hole to achieve a fixed connection between the bearing mounting post and the front housing.

[0012] Furthermore, the bearing mounting post has a mounting groove on its end face, and a sealing element for sealing connection with the front housing is installed in the mounting groove.

[0013] Furthermore, the bearing mounting column is provided with a connecting oil passage extending along its height direction. One end of the connecting oil passage is connected to one of the branch oil passages, and the other end of the connecting oil passage is provided with an oil outlet, which extends radially along the bearing mounting column.

[0014] Furthermore, the circumferential edge of the housing body is provided with a plurality of connecting portions for connecting with the gearbox housing, and at least one of the connecting portions is provided with a hollow pin, which is connected to the gearbox housing by a second bolt passing through the hollow pin, so as to realize the connection between the housing body and the gearbox housing.

[0015] Furthermore, the intermediate housing for the gearbox also includes a plug for mounting at the corresponding end of the pressure lubrication passage.

[0016] Compared to existing technologies, the advantages of this utility model's intermediate housing for a gearbox are as follows: It can precisely solve the technical problem of the difficulty in effectively lubricating high-position gears using traditional splash lubrication methods. By providing pressure lubrication oil passages on the housing body, including a main oil passage and multiple branch oil passages, directional lubrication is formed. Furthermore, by configuring a corresponding throttle valve to regulate the oil flow, precise lubrication and cooling of the meshing areas of high-position gears and the waiting lubrication areas of high-position bearings within the gearbox are achieved, completely avoiding lubrication failure and overheating risks under high-speed and high-load conditions. In addition, the structural design of the intermediate housing of this application fully conforms to the spatial layout characteristics of a longitudinally mounted gearbox. It integrates pressure lubrication oil passages, bearing mounting holes, and connecting parts for connecting the gearbox housing. While meeting the high-position lubrication requirements, it simplifies the assembly process of the longitudinally mounted hybrid gearbox, reduces assembly difficulty and production costs, reduces space occupancy, and improves the overall structural rigidity, resisting vibration and impact under off-road conditions, effectively extending the service life of the gearbox, and ensuring the off-road performance and reliability of hybrid off-road vehicles. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural view of the intermediate housing for the gearbox of this utility model from a first perspective. Figure 2 This is a three-dimensional structural view of the intermediate housing for the gearbox of this utility model from a second perspective. Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle; Figure 4 This is a structural diagram of the side of the intermediate housing of the gearbox of this utility model that is away from the pressure lubrication oil passage; Figure 5 for Figure 4 Schematic diagram of the cross section at point BB; Figure 6 This is another cross-sectional schematic diagram of the intermediate housing for the gearbox of this utility model; Figure 7 This is a structural schematic diagram of the intermediate housing of the gearbox of this utility model in its assembled state; Figure 8 This is a partial cross-sectional view of the intermediate housing for the gearbox of this utility model in its assembled state.

[0018] The above-mentioned figures include the following reference numerals: 10-intermediate housing; 11-housing body; 111-first connecting hole; 112-second connecting hole; 101-main oil passage; 102-first branch oil passage; 103-second branch oil passage; 104-third branch oil passage; 12-oil pipe interface; 13-bearing mounting hole; 14-oil collection groove; 15-bearing mounting column; 151-concave rounded corner structure; 152-internal threaded hole; 153-mounting groove; 154-connecting oil passage; 155-oil outlet; 21-hollow pin; 22-first bolt; 23-second bolt; 24-oil supply pipe; 25-first throttle valve; 26-second throttle valve; 27-plug head; 28-seal; 31-gearbox housing; 32-front housing; 331-motor bearing; 332-input gear; 333-idler gear; 334-motor shaft gear; 335-high position bearing.

[0019] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0020] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0021] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] Please see Figures 1 to 8The diagram shows an intermediate housing for a gearbox according to the present invention. The intermediate housing 10 includes a housing body 11, within which a pressure lubrication oil passage is formed to guide lubricating oil to the lubrication area within the gearbox. The pressure lubrication oil passage includes a main oil passage 101 for connecting to a pressure oil source, and at least one branch oil passage branching off from the main oil passage 101. The end of the branch oil passage is provided with a spray hole. In practical applications, the spray hole is installed near the lubrication area within the gearbox to directly spray high-pressure lubricating oil in the form of a concentrated oil column onto the gear meshing surface and bearing raceway waiting lubrication areas. This effectively solves the technical problem of insufficient lubrication and poor cooling effect caused by the high-position gear being far from the oil level in the oil pan in traditional splash lubrication methods.

[0024] Furthermore, the housing body 11 is provided with an oil pipe interface 12 that communicates with the input end of the main oil circuit 101. This oil pipe interface 12 is used to install one end of the oil supply pipe 24. In this embodiment, one end of the oil supply pipe 24 is securely installed in the oil pipe interface 12 by means of a threaded connection to avoid oil leakage. The other end of the oil supply pipe 24 penetrates into the interior of the gearbox housing 31 and is sealed and communicated with the internal oil passage of the gearbox housing 31 to form a complete oil delivery route. It should be noted that the oil in the pressure lubrication oil passage does not flow naturally, but is powered by an external oil pump. Specifically, the external oil pump first draws the lubricating oil from the gearbox oil pan and pumps it into the internal oil passage of the gearbox housing 31. The oil flows along the internal oil passage to the interface of the oil supply pipe 24, and is then delivered to the oil pipe interface 12 of the intermediate housing 10 via the oil supply pipe 24, and finally enters the main oil circuit 101. The oil is pressurized by the oil pump, and the oil entering the pressure lubrication channel is in a high-pressure state. This ensures that the oil can overcome the high-level transport resistance and achieve effective diversion of the multi-branch oil circuit. After the high-pressure oil is sprayed directionally into the corresponding gear meshing area through the injection holes at the end of each branch oil circuit, the oil that has completed its lubrication and cooling tasks will naturally flow back to the oil pan, forming a complete oil circulation of "extraction-pressurization-transportation-lubrication-return", which not only ensures the continuity of lubrication, but also realizes the recycling of oil.

[0025] Furthermore, at least one injection hole is equipped with a throttle valve for adjusting the flow rate of lubricating oil. The throttle valve increases the oil pressure at the end of the branch oil circuit, forming a stable high-pressure oil column, ensuring that the oil can be accurately sprayed onto the gear meshing position.

[0026] In this embodiment, the branch oil circuit includes a first branch oil circuit 102, a second branch oil circuit 103, and a third branch oil circuit 104 leading to different lubrication points. A first throttle valve 25 is installed in the injection hole of the first branch oil circuit 102 by riveting, and a second throttle valve 26 is installed in the injection hole of the second branch oil circuit 103 by riveting. The first throttle valve 25 and the second throttle valve 26 can be configured with the same or different flow coefficients according to the load requirements of the corresponding high-level gear. For example, if a larger flow rate is required at the meshing point of the high-speed gear, a throttle valve with a large flow coefficient can be configured accordingly.

[0027] In practical applications, the oil enters the main oil circuit 101 through the oil supply pipe 24, and is then distributed to the first branch oil circuit 102, the second branch oil circuit 103, and the third branch oil circuit 104. Specifically, the oil passes through the first throttle valve 25 at the end of the first branch oil circuit 102 to form a high-pressure oil column, which is precisely sprayed onto the meshing point of the input gear 332 and the idler gear 333 arranged at a high position in the longitudinally mounted gearbox, achieving forced lubrication of the high-position meshing surface. The oil is sprayed out through the second throttle valve 26 at the end of the second branch oil circuit 103, providing directional lubrication to the meshing point of the idler gear 333 and the motor shaft gear 334, which are also installed at a high position, ensuring the reliability of lubrication during high-position power transmission. The oil in the third branch oil circuit 104 is introduced into the connecting oil circuit 154 in the bearing mounting column 15, and finally delivered to the high-position bearing 335 installation position through the oil outlet 155, achieving circulating lubrication of the high-position bearing 335 sleeved on the bearing mounting column 15. The integrated pressure lubrication channel design completely solves the problems of traditional splash lubrication failing to cover the dead angle of meshing of high-position gears in longitudinally mounted transmissions and insufficient lubrication of the 335 inner ring of high-position bearings. It realizes active and precise lubrication of key high-position components, significantly improving the service life and operational stability of gears and bearings in longitudinally mounted hybrid transmissions.

[0028] Furthermore, the housing body 11 is also provided with a bearing mounting hole 13 for installing a bearing. The diameter of the bearing mounting hole 13 is precisely matched with the outer diameter of the motor bearing 331. An oil collection groove 14 communicating with it is provided on one side. The oil collection groove 14 extends radially outward along the bearing mounting hole 13 and has an elongated groove structure. In actual assembly and use, the bearing mounting hole 13 can be used to install the motor bearing 331 separately before the gearbox is assembled. It can be used with relevant testing components to achieve auxiliary testing of motor performance without repeatedly disassembling and assembling the longitudinal gearbox as a whole, which greatly improves the matching test efficiency of the motor and the longitudinal gearbox. At the same time, the oil collection groove 14 can collect the lubricating oil splashed in the gearbox to form a local oil pool, which can achieve auxiliary lubrication of the outer ring of the motor bearing 331 located in the bearing mounting hole 13. The intermediate housing 10 of this application simplifies the overall assembly process of the longitudinal hybrid power gearbox through the highly integrated design of the pressure lubrication oil channel and the bearing mounting hole 13, reduces the assembly difficulty and production cost, and optimizes the operability of the production process.

[0029] Furthermore, the housing body 11 is also provided with a bearing mounting post 15. The connection between the bearing mounting post 15 and the housing body 11 adopts a concave rounded corner structure 151. This concave rounded corner structure 151 effectively increases the installation clearance between the bearing mounting post 15 and the motor bearing 331 while ensuring the overall structural strength of the intermediate housing 10, thus completely avoiding mechanical interference between the intermediate housing 10 and the motor bearing 331 during assembly or operation. The bearing mounting post 15 is also provided with an internally threaded hole 152 extending along its height direction. During assembly, the first bolt 22 passes through the gearbox front housing 32 and is threadedly connected to the internally threaded hole 152, thereby achieving rigid fixation between the bearing mounting post 15 and the front housing 32. This greatly improves the strength and rigidity of the bearing mounting post 15 and the entire intermediate housing 10, ensuring the normal operation of the gearbox.

[0030] Furthermore, an annular mounting groove 153 is provided on the end face of the bearing mounting post 15, and a sealing element 28 for sealing connection with the front housing 32 is installed in the mounting groove 153. In this embodiment, the sealing element 28 is an O-ring, which is made of oil-resistant rubber. By pressing the O-ring in the mounting groove 153, the connection gap between the bearing mounting post 15 and the wall of the front housing 32 can be effectively sealed, preventing lubricating oil leakage and external dust and impurities from entering the longitudinally mounted gearbox. This greatly improves the connection sealing between the two, ensures the cleanliness of the gearbox and the pressure stability of the lubrication system, and avoids insufficient high-level lubrication pressure due to seal failure.

[0031] Furthermore, the bearing mounting post 15 is provided with a connecting oil passage 154 extending along its height direction. One end of the connecting oil passage 154 is connected to one of the branch oil passages, namely the third branch oil passage 104, and the other end of the connecting oil passage 154 is provided with an oil outlet 155. The oil outlet 155 extends radially along the bearing mounting post 15 and penetrates the surface of the bearing mounting post 15. In actual assembly and use, the position of the oil outlet 155 is precisely aligned with the lubrication channel of the high-position bearing 335, ensuring that high-pressure oil can directly enter the rolling element gap of the bearing, achieving comprehensive lubrication of the inner ring, rolling elements and cage of the high-position bearing 335, effectively reducing bearing operating resistance and wear, and adapting to the lubrication requirements of the high-position bearing 335 of the longitudinal gearbox.

[0032] Furthermore, the circumferential edge of the housing body 11 is provided with multiple connecting portions for connection with the gearbox housing 31. At least one connecting portion is provided with a hollow pin 21, and a second bolt 23 passes through the hollow pin 21 to connect with the gearbox housing 31, thereby realizing the connection between the housing body 11 and the gearbox housing 31. Specifically, in this embodiment, the connecting portion includes two first connecting holes 111 and three second connecting holes 112. The two first connecting holes 111 are symmetrically arranged on both sides of the intermediate housing 10 to form the main force support points; the three second connecting holes 112 are evenly spaced on the circumferential edge of the housing body 11 between the two first connecting holes 111 to form auxiliary fixing points. The first connecting hole 111 is fitted with a hollow pin 21. The hardness of the hollow pin 21 is higher than that of the housing body 11, which can disperse the stress during bolt tightening and prevent deformation of the connecting hole. During assembly, the second bolt 23 passes through the hollow pin 21 and connects to the corresponding position on the gearbox housing 31. At the same time, the second bolt 23 passes directly through the second connecting hole 112 and connects to the corresponding position on the gearbox housing 31, forming a balanced force-bearing structure of "two-point main support + three-point auxiliary fixation". This design not only makes the connection between the intermediate housing 10 and the gearbox housing 31 more robust and reliable, but also minimizes the space occupation of the intermediate housing 10 inside the longitudinal gearbox, providing greater flexibility for the layout of components such as high-position gears and motors inside the longitudinal gearbox. This is conducive to the miniaturization and lightweight design of the longitudinal hybrid gearbox, meeting the performance requirements of off-road vehicles.

[0033] Furthermore, the intermediate housing 10 for the gearbox also includes a plug head 27, which is adapted to the end size of the pressure lubrication oil passage. The plug head 27 is installed at the corresponding end of the pressure lubrication oil passage using a threaded connection or interference fit, and is used to seal the process holes reserved during the oil passage machining process. Specifically, in this embodiment, a plug head 27 is provided at the machining start end on the side of the main oil passage 101 opposite to the oil pipe interface 12. The plug head 27 is made of oil-resistant sealing material, and its sealing surface is tightly fitted to the end of the main oil passage 101, which can effectively ensure the sealing of the entire pressure lubrication oil passage, prevent oil leakage, ensure the pressure stability in the oil passage, and provide a guarantee for the high-pressure lubrication of the high-position gear.

[0034] Compared to existing technologies, the advantages of this utility model's intermediate housing for a gearbox are as follows: It can precisely solve the technical problem of the difficulty in effectively lubricating high-position gears using traditional splash lubrication methods. By providing pressure lubrication oil passages on the housing body, including a main oil circuit and multiple branch oil circuits, directional lubrication is formed. Furthermore, by configuring corresponding throttle valves to regulate oil flow, precise lubrication and cooling of the high-position gear meshing area and high-position bearings are achieved, completely avoiding lubrication failure and overheating risks under high-speed and high-load conditions. In addition, the structural design of the intermediate housing of this application fully conforms to the spatial layout characteristics of a longitudinally mounted gearbox. It integrates pressure lubrication oil passages, bearing mounting holes, and connecting parts for connecting the gearbox housing. While meeting the high-position lubrication requirements, it simplifies the assembly process of the longitudinally mounted hybrid gearbox, reduces assembly difficulty and production costs, reduces space occupancy, and improves the overall structural rigidity, resisting vibration and impact under off-road conditions, effectively extending the service life of the gearbox, and ensuring the off-road performance and reliability of hybrid off-road vehicles.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model application should be determined by the appended claims.

Claims

1. An intermediate housing for a gearbox, the intermediate housing being disposed between a gearbox housing and a front housing, characterized in that, include: The housing body has a pressure lubrication channel formed therein, which is used to guide lubricating oil to the area to be lubricated in the gearbox. The pressure lubrication oil passage includes a main oil passage for connecting to a pressure oil source, and at least one branch oil passage branched off from the main oil passage, with a spray hole at the end of the branch oil passage.

2. The intermediate housing for a gearbox according to claim 1, characterized in that, The housing body is provided with an oil pipe interface that is connected to the main oil circuit. The oil pipe interface is used to install one end of the oil supply pipe, and the other end of the oil supply pipe is connected to the internal oil passage of the gearbox housing.

3. The intermediate housing for a gearbox according to claim 1, characterized in that, At least one of the injection holes is equipped with a throttle valve for regulating the flow rate of lubricating oil.

4. The intermediate housing for a gearbox according to claim 3, characterized in that, The branch oil circuit includes a first branch oil circuit, a second branch oil circuit, and a third branch oil circuit leading to different lubrication parts. The first branch oil circuit has a first throttle valve in its injection hole, and the second branch oil circuit has a second throttle valve in its injection hole.

5. The intermediate housing for a gearbox according to claim 1, characterized in that, The housing body is also provided with a bearing mounting hole for installing a bearing, and an oil collection groove communicating with the bearing mounting hole is provided on one side of the bearing mounting hole, the oil collection groove extending radially along the bearing mounting hole.

6. The intermediate housing for a gearbox according to claim 1, characterized in that, The housing body is also provided with a bearing mounting post, and the connection between the bearing mounting post and the housing body is provided with a concave rounded corner structure; The bearing mounting post is provided with an internally threaded hole extending along its height direction. A first bolt passes through the front housing and is threaded into the internally threaded hole to achieve a fixed connection between the bearing mounting post and the front housing.

7. The intermediate housing for a gearbox according to claim 6, characterized in that, The bearing mounting post has a mounting groove on its end face, and a sealing element for sealing connection with the front housing is installed in the mounting groove.

8. The intermediate housing for a gearbox according to claim 6, characterized in that, The bearing mounting column is provided with a connecting oil passage extending along its height direction. One end of the connecting oil passage is connected to one of the branch oil passages, and the other end of the connecting oil passage is provided with an oil outlet, which extends radially along the bearing mounting column.

9. The intermediate housing for a gearbox according to claim 1, characterized in that, The circumferential edge of the housing body is provided with a plurality of connecting parts for connecting with the gearbox housing. At least one of the connecting parts is provided with a hollow pin, and a second bolt passes through the hollow pin to connect with the gearbox housing, so as to realize the connection between the housing body and the gearbox housing.

10. The intermediate housing for a gearbox according to claim 1, characterized in that, The intermediate housing for the gearbox also includes a plug for mounting at the corresponding end of the pressure lubrication passage.

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