Transmission system and vehicle

Abstract

To provide a vehicle transmission system which is structurally simple and spatially intensive, and to provide a vehicle including the transmission system.SOLUTION: The invention relates to a vehicle transmission system including: a housing having a main housing and a cover part; a speed reducer and a motor disposed in the housing; a lubrication system disposed in the housing and including a fluid passage extending between the speed reducer and the motor. According to the invention, the fluid passage extends from a first gear of the speed reducer to a motor shaft of the motor and guides a lubrication medium to the motor by the fluid passage so as to cool the motor. Further, the invention relates to a vehicle including the transmission system.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vehicle transmission system and a vehicle equipped with a transmission system. [Background technology]

[0002] In vehicles, especially electric vehicles, an integrated transmission system is used, which includes a motor and a reducer. An oil lubrication system is used to lubricate the reducer. At the same time, an oil cooling system and an independent air cooling system are also used to cool the motor. In the design of the transmission system in the prior art, after the gearbox is installed at a predetermined position in the vehicle, the lubricating medium inside the box body of the gearbox is deposited at the bottom of the box body to lubricate various transmission components, and the rotation of the gears in the gearbox stirs the lubricating medium at the bottom of the box body, so that the lubricating medium splashes onto nearby components to lubricate them. In order to save the lubricating medium, a pump device is further used to pump the lubricating medium used to lubricate the gears into the motor to cool the motor. As the requirements for the compactness of the installation space and the simplicity of the structure are continuously increasing, the design of the transmission system in the prior art cannot meet the needs, and furthermore, the overall weight is increased by providing an additional pump device. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of the above, the technical problem to be solved by the present invention is to provide a structurally simple and space-saving transmission system for a vehicle, and a vehicle equipped with such a transmission system. [Means for solving the problem]

[0004] In order to solve the above technical problem, the present invention provides a vehicle transmission system, comprising: a housing having a main housing and a cover portion; A reducer and a motor disposed within a housing; a lubrication system including a fluid passage disposed within the housing and extending between the reducer and the motor; A vehicle transmission system is provided.

[0005] According to the present invention, the fluid passage extends from the first gear of the reducer to the motor shaft of the motor, and the fluid passage guides the lubricating medium to the motor to cool the motor.

[0006] This results in a fluid passage that is substantially sealed from the outside, allowing for a more precise active guidance of the lubricating medium.

[0007] The vehicle transmission system according to the invention may further comprise one or more of the following features, either individually or in combination:

[0008] In one embodiment, the fluid passage comprises a bottom wall and a first side wall, the bottom wall and the first side wall being integrally constructed with the cover portion of the housing. Here, the bottom wall and the first side wall are integrally cast with the cover portion, respectively, thereby simplifying the manufacturing process and improving strength. Optionally, the top wall may also be integrally constructed with the cover portion.

[0009] In one embodiment, the lubrication system includes a baffle forming a second sidewall of the fluid passageway remote from the housing, the second sidewall fixedly connected to the bottom wall.

[0010] In one embodiment, the inlet of the fluid passage is directed towards the first gear of the reducer to receive the lubricating medium transmitted from the first gear of the reducer so as to supply the lubricating medium to the fluid passage via the inlet.

[0011] In one embodiment, the housing wall of the main housing at least partially surrounds the first gear, and at the inlet of the fluid passage, the extension of the upper wall of the fluid passage is in contact with the housing wall surrounding the first gear, so that the upper edge of the fluid passage is in contact with the housing wall surrounding the first gear, so that the inlet of the fluid passage is maximally exposed to the lubricating medium discharged by the first gear when rotating, and collects as much lubricating medium as possible discharged from the reducer and transmits it to the motor, thereby saving material costs.

[0012] In one embodiment, the outlet of the fluid passage extends downwardly from the bottom wall of the fluid passage and communicates with the hollow cavity of the motor shaft.

[0013] In one embodiment, the hollow cavity includes at least one radially extending perforation.

[0014] In one embodiment, the rotation of the motor shaft creates a negative pressure in the hollow cavity, which drives the lubricating medium from the reducer to the motor through the fluid passage. Thus, the lubricating medium is actively transported from the reducer to the motor without the need for an additionally configured pump device. The structure is simplified and the overall weight of the transmission system is reduced.

[0015] In one embodiment, the fluid passage includes a stop rib disposed on the bottom wall and a branch passage cooperating with the bottom wall to branch the lubricating medium guided in the fluid passage.

[0016] In one embodiment, the branch passage includes a hollow projection extending outwardly from the second sidewall, the projection including the branch outlet.

[0017] In one embodiment, the first gear is a reducer gear. Optionally, the first gear may also be another gear of the reducer.

[0018] In order to solve the above technical problem, the present invention further provides a vehicle including the above transmission system.

[0019] In order to more clearly describe the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly described below. It is obvious that the drawings in the following description do not limit the present invention, and are only related to some embodiments of the present invention. [Brief description of the drawings]

[0020] [Figure 1] 1 shows a schematic front view of a transmission system according to the invention; [Diagram 2] 2 shows a schematic 3D view of the transmission system shown in FIG. 1; [Diagram 3] 2 is a schematic partial cutaway view of the fluid passages of the transmission system shown in FIG. 1; [Figure 4] 2 shows a schematic diagram of another view of the transmission system shown in FIG. 1; [Diagram 5] 2 shows a schematic diagram of another partial cutaway view of the transmission system shown in FIG. 1; [Figure 6] 4A and 4B show schematic 3D views of the second sidewall of the fluid passage shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The technical solutions in the embodiments of the present invention are described below clearly and completely with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without the efforts of the present invention shall fall within the scope of protection of the present invention.

[0022] The phrase "one embodiment" or "embodiment" as used herein means a particular feature, structure, or characteristic that may be included in at least one embodiment of the present invention. In describing the present invention, the orientation or positional relationship indicated by terms such as "up", "down", "left", "right", "top", "bottom", etc., is based on the orientation or positional relationship shown in the drawings, and is intended merely to facilitate and simplify the description of the present invention, rather than to indicate or imply that the devices or elements referred to have a particular orientation or must be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

[0023] In the present invention, the term "axial direction" refers to the direction of the central axis of the first gear of the reducer, and the term "radial direction" refers to the direction perpendicular to the central axis.

[0024] For the sake of brevity, only those components closely related to the present invention are shown diagrammatically in FIGS.

[0025] 1 and 2 show a schematic diagram of an embodiment of a transmission system according to the present invention. The transmission system comprises a housing, a reducer 1 and a motor 2 arranged in the housing, the housing comprises a cover part 10 and a main housing not shown in FIG. 1, the cover part 10 covers the housing of the transmission system from an end face. Furthermore, a lubrication system is further arranged in the housing, and comprises a fluid passage 3 and a liquid collection tank 4 used for the lubricating medium and corresponding in height approximately to the lower part of the reducer 1.

[0026] As shown in Fig. 2, the reducer 1 comprises a first gear 11 near the cover part 10 of the housing. In this embodiment, the first gear 11 is a reducer gear. In other optional embodiments not shown, the first gear may also be another gear of the reducer.

[0027] A motor shaft 21 of the motor 2 is also provided near the cover part 10 of the housing, and the axial direction of the motor shaft 21 extends parallel to the central axis of the first gear 11. The motor shaft 21 is provided with a hollow cavity, and as shown in Fig. 5, a plurality of radially extending perforations 21a are provided in the hollow cavity, which are used to connect the motor windings surrounding the outside of the motor shaft 21 to the hollow cavity.

[0028] 1 and 2, a fluid passage 3 is provided that extends between the reducer 1 and the motor shaft 21. The fluid passage 3 extends in a bent manner, with its inlet 3a directed toward the first gear 11 of the reducer 1 and its outlet 3b communicating with the hollow cavity of the motor shaft 21.

[0029] As shown in FIG. 3, the fluid passage 3 comprises a top wall 31, a bottom wall 32 and two side walls, namely a first side wall 33 and a second side wall 34. As shown in FIGS. 1 and 2, the top wall 31, the bottom wall 32 and the first side wall 33 are integrally cast with the cover part 10 of the housing of the transmission system, while the second side wall 34 is constructed as an independent baffle. As shown in FIG. 6, the second side wall 34 is constructed as a flat baffle with a cross section extending in a bend and is fixedly connected to the bottom wall 32 by a fixing part 342 at the lower edge of the baffle, preferably by a screw connection or a rivet joint. This forms a passage with a substantially rectangular cross section and essentially sealed in its length. The second side wall 34 is further provided with an outwardly extending projection 341, which projection 341 comprises several radially extending reinforcements. The projection 341 will be explained in more detail below.

[0030] As shown in FIG. 1, the housing wall of the main housing partially surrounds the first gear 11, and at the inlet 3a of the fluid passage 3, an extension of the upper wall 31 contacts the housing wall surrounding the first gear 11 of the reducer 1.

[0031] For clarity, the upper wall 31 of the fluid passage 3 is not visible in FIG. 2 so that the interior of the fluid passage 3 is more clearly shown.

[0032] The outlet 3b of the fluid passage 3 is located at the end of the fluid passage 3, extends downward from the bottom wall 32, and communicates with the hollow cavity of the motor shaft 21. As shown in Fig. 5, the cavity of the outlet 3b communicates with the hollow cavity of the motor shaft approximately vertically, thereby forming a main passage of the fluid passage 3, and the lubricating medium discharged by the first gear 11 passes from the inlet 3a through the main passage and proceeds from the outlet 3b to the hollow cavity of the motor shaft 21.

[0033] Furthermore, the bottom wall 32 is provided with an upwardly protruding stop rib 32a which extends in the width direction of the fluid passage 3 upstream of the outlet 3b, and correspondingly, the protrusion 341 of the second side wall 34 is provided with a branch outlet 341a constructed as a through hole, and thus the branch passage is formed by the stop rib 32a of the protrusion 341 and the branch outlet 341a.

[0034] When the transmission system works, the first gear 11 of the reducer 1 rotates, and its lower part carries the lubricating medium in the liquid recovery tank 4, so that the first gear 11 and even other gears in the transmission system are lubricated. The lubricating medium repelled tangentially by the first gear 11 enters the fluid passage 3 from the inlet 3a of the fluid passage 3. As the motor shaft 21 of the motor 2 rotates, a negative pressure is formed in the hollow cavity of the motor shaft 21, and the hollow cavity communicates with the outlet 3b of the fluid passage 3. Therefore, the lubricating medium in the fluid passage 3 is continuously sucked into the hollow cavity of the motor shaft 21 under the influence of the negative pressure, and is transported from the hollow cavity to the outside of the winding through the radially extending perforations 21a, cooling the motor 2.

[0035] In addition, a part of the lubricating medium flowing through the fluid passage 3 is blocked by the stop rib 32a and flows out from the branch outlet 341a. In the embodiment shown in Fig. 6, since the branch outlet 341a faces downward, the lubricating medium flowing out through the branch is transported to the components located below the fluid passage 3, lubricates the components, and finally falls down to be collected in the liquid recovery tank 4 below.

[0036] This allows the lubricating medium to be actively guided from the reducer 1 to the motor 2 without the need for an additional pump device, thereby achieving the dual functions of lubrication and cooling with a simple structure.

[0037] According to another aspect of the present invention, there is further provided a vehicle including the above-mentioned transmission system. The vehicle may be a plug-in hybrid electric vehicle, or a battery electric vehicle or another type of vehicle. Thus, the vehicle can realize the motor components and motor functions described above and has the advantages described above.

[0038] The particular features, structures or characteristics in one or more embodiments of the present application may be combined in any suitable manner.

[0039] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art. It should also be understood that unless expressly defined herein, terms as defined in common dictionaries should be interpreted as having the same meaning as they have in the context of the relevant art, rather than being interpreted in an idealized or highly formalized sense.

[0040] The above is a description of the present invention and should not be considered as limiting the present invention. Although specific exemplary embodiments of the present invention have been described, those skilled in the art will readily appreciate that many modifications can be made to the exemplary embodiments without departing from the novel teachings and advantages of the present invention. Accordingly, all such modifications are intended to be included within the scope of the present invention as defined by the claims. It should be understood that the above is a description of the present invention and that the present invention should not be considered as being limited to the specific embodiments disclosed herein. In addition, modifications made to the disclosed embodiments and other embodiments are intended to be included within the scope of the present invention. [Explanation of symbols]

[0041] 1 Reducer 10 Cover part 11 First Gear 2 Motors 21 Motor shaft 21a perforation 3 Fluid passage 3a entrance 3b exit 31 Upper Wall 32 Bottom wall 32a Stop rib 33 First side wall 34 Second Side Wall 341 Protrusion 341a Branch Exit 342 Fixed part

Claims

1. A vehicle transmission system, comprising: a housing comprising a main housing and a cover part (10); A reducer (1) and an electric motor (2) disposed within the housing; a lubrication system disposed within the housing, the lubrication system comprising a fluid passage (3) extending between the reducer (1) and the electric motor (2); Equipped with the fluid passage (3) extends from the first gear (11) of the reducer (1) to an electric motor shaft (21) of the electric motor (2), and guides a lubricating medium through the fluid passage (3) to the electric motor (2) to cool the electric motor (2); Transmission system.

2. The fluid passage (3) comprises a bottom wall (32) and a first side wall (33), the bottom wall (32) and the first side wall (33) being integrally constructed with the cover part of the housing.

2. A transmission system according to claim 1 , characterized in that

3. The lubrication system comprises a baffle forming a second side wall (34) of the fluid passage (3) remote from the housing, the second side wall being fixedly connected to the bottom wall (32). A transmission system according to claim 2 , characterized in that

4. An inlet (3a) of the fluid passage (3) is directed towards the first gear (11) of the reducer (1) for receiving the lubricating medium transmitted from the first gear of the reducer (1) such that the lubricating medium can flow into the fluid passage (3) via the inlet.

2. A transmission system according to claim 1 , characterized in that

5. The housing wall of the main housing at least partially surrounds the first gear (11), and at the inlet of the fluid passage (3), an extension of the upper wall (31) of the fluid passage (3) contacts the housing wall surrounding the first gear (11).

5. A transmission system according to claim 4, characterized in that

6. An outlet (3b) of the fluid passage (3) extends downward from a bottom wall (32) of the fluid passage (3) and communicates with a hollow cavity of the electric motor shaft (21). A transmission system according to claim 2 , characterized in that

7. The hollow cavity includes at least one radially extending perforation (21a). A transmission system according to claim 6 .

8. Rotation of the electric motor shaft (21) creates a negative pressure in the hollow cavity, thereby forcing the lubricating medium from the reducer (1) to the electric motor (2) via the fluid passage (3). A transmission system according to claim 7 , characterized in that

9. The fluid passage (3) comprises a stop rib (32a) arranged on the bottom wall (32) and a branch passage cooperating with the bottom wall (32) for dividing the lubricating medium guided in the fluid passage (3).

2. A transmission system according to claim 1 , characterized in that

10. The branch passage includes a hollow projection (341) extending outwardly from the second side wall (34), the projection (341) including a branch outlet (341a). A transmission system according to claim 9 .

11. The first gear (11) is a reduction gear.

2. A transmission system according to claim 1 , characterized in that

12. A vehicle comprising a transmission system according to any one of claims 1 to 11.

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