Transmission system and vehicle

Abstract

A transmission system for a vehicle includes: a housing including a main housing and a cover portion; the speed reducer and the motor are arranged in the shell; and a lubrication system disposed in the housing and including a fluid passage extending between the decelerator and the electric motor. According to the invention, the fluid channel extends from the first gear of the speed reducer to the motor shaft of the electric motor in order to conduct a lubricating medium to the electric motor by means of the fluid channel in order to cool the electric motor. In addition, the invention further relates to a vehicle which comprises the transmission system.

Description

Technical Field

[0001] The present invention relates to a transmission system for a vehicle and a vehicle having the transmission system. Background Art

[0002] An integrated transmission system is used in vehicles, especially in electric vehicles, which includes an electric motor and a reducer. An oil lubrication system is used to lubricate the reducer, and at the same time, the electric motor is cooled by means of an oil cooling system and an independent air cooling system. In the design of the existing transmission system, when the gearbox is installed in place in the vehicle, the lubricating medium inside the gearbox housing used to lubricate the transmission components will be deposited at the bottom of the housing, and the rotation of the gears in the gearbox will stir the lubricating medium at the bottom of the housing so that the lubricating medium splashes to nearby components to lubricate them. In order to save the lubricating medium, the lubricating medium used for gear lubrication is also pumped to the motor with the help of a pump device to cool it. With the increasing requirements for installation space intensiveness and structural simplification, the design of the existing transmission system cannot meet the requirements, and the overall weight is increased due to the additional provision of a pump device. Summary of the invention

[0003] In view of this, the technical problem to be solved by the present invention is to provide a transmission system for a vehicle with a simple structure and space-saving, and a vehicle having the transmission system.

[0004] In order to solve the technical problem, the present invention provides a transmission system for a vehicle, comprising:

[0005] A housing, comprising a main housing and a cover;

[0006] A speed reducer and a motor are arranged in the housing;

[0007] a lubrication system, the lubrication system being arranged in the housing and comprising:

[0008] A fluid passage extending between the speed reducer and the electric motor.

[0009] According to the present invention, the fluid channel extends from the first gear of the speed reducer to the motor shaft of the electric motor, so that the lubricating medium is guided to the electric motor via the fluid channel, so as to cool the electric motor.

[0010] This results in a fluid channel which is substantially closed relative to the outside, thereby enabling a more precise active guidance of the lubricating medium.

[0011] Preferably, the fluid channel comprises a bottom wall and a first side wall, and the bottom wall and the first side wall are integrally constructed with the cover of the housing. Here, the bottom wall and the first side wall are respectively integrally cast with the cover, thereby simplifying the manufacturing process and improving the strength. Optionally, the top wall can also be integrally constructed with the cover.

[0012] More preferably, the lubrication system comprises a baffle, wherein the baffle constitutes a second side wall of the fluid channel away from the housing, and the second side wall is fixedly connected to the bottom wall.

[0013] Preferably, the inlet of the fluid channel points to the first gear of the reducer to receive the lubricating medium transmitted from the first gear of the reducer, and then the lubricating medium can be input into the fluid channel through the inlet.

[0014] More preferably, the housing wall of the main housing at least partially surrounds the first gear, and at the inlet of the fluid channel, the extension line of the top wall of the fluid channel is tangent to the housing wall surrounding the first gear. Thus, the upper edge of the fluid channel is tangent to the housing wall surrounding the first gear, so that the inlet of the fluid channel faces the lubricating medium thrown out by the first gear during rotation to the greatest extent, collects as much lubricating medium output from the reducer as possible and transmits it to the motor, thereby saving material costs.

[0015] Preferably, the outlet of the fluid channel extends downward from the bottom wall of the fluid channel and is communicated with the hollow cavity of the motor shaft.

[0016] More preferably, the hollow cavity comprises at least one through hole extending in the radial direction.

[0017] More preferably, negative pressure is generated in the hollow cavity by the rotation of the motor shaft, so that the lubricating medium is sucked from the reducer to the motor via the fluid channel. In this way, the lubricating medium is actively transported from the reducer to the motor without the need for an additional pump device, thereby simplifying the structure and reducing the total weight of the transmission system.

[0018] Preferably, the fluid channel comprises a stop rib arranged on the bottom wall and a branch channel cooperating with the bottom wall for diverting the lubricating medium guided in the fluid channel.

[0019] Preferably, the branch channel comprises a hollow raised portion extending outwardly from the second side wall, wherein the raised portion comprises a branch outlet.

[0020] Preferably, the first gear is a reducer gear. Optionally, the first gear may also be another gear of the reducer.

[0021] In order to solve the technical problem, the present invention also provides a vehicle, which includes the above-mentioned transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0023] Figure 1 A front view schematically showing a transmission system according to the present invention;

[0024] Figure 2 Schematically shown Figure 1 A perspective view of the transmission system shown;

[0025] Figure 3 Schematically shown Figure 1 A partial cutaway view of a fluid passage of the transmission system shown;

[0026] Figure 4 Schematically shown Figure 1 Another view of the transmission system shown;

[0027] Figure 5 Schematically shown Figure 1 Another partial cutaway view of the transmission system shown; and

[0028] Figure 6 Schematically shown Figure 3 A perspective view of the second side plate of the fluid channel is shown. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0031] In the present invention, the axial direction refers to a direction along the central axis of the first gear of the reducer, and the radial direction refers to a direction perpendicular to the central axis.

[0032] For simplicity, Figures 1 to 6 Only components closely related to the present invention are schematically shown.

[0033] Figure 1 and Figure 2 The transmission system according to the present invention is schematically shown. The transmission system includes a housing and a reducer 1 and a motor 2 arranged in the housing, wherein the housing includes Figure 1 The main housing and the cover 10 not shown in the figure cover the housing of the transmission system from the end face. In addition, a lubrication system is also arranged in the housing, which includes a fluid channel 3 and a sump 4 for lubricating medium arranged at a height roughly corresponding to the lower part of the reducer 1.

[0034] like Figure 2 As shown, the reducer 1 comprises a first gear 11 close to the cover 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 other gears of the reducer.

[0035] The cover 10 near the housing is also provided with a motor shaft 21 of the motor 2, wherein the axial direction of the motor shaft 21 extends parallel to the central axis of the first gear 11. The motor shaft 21 has a hollow cavity, such as Figure 5 As shown, a plurality of radially extending through holes 21 a are provided on the hollow cavity, for connecting the hollow cavity with the motor winding wrapped around the outside of the motor shaft 21 .

[0036] like Figure 1 and Figure 2 As shown, a fluid channel 3 extending between the reducer 1 and the motor shaft 21 is provided. The fluid channel 3 extends in a curved manner, with its inlet 3a pointing to the first gear 11 of the reducer 1 and its outlet 3b communicating with the hollow cavity of the motor shaft 21 .

[0037] like Figure 3 As shown, the fluid channel 3 includes a top wall 31, a bottom wall 32 and two side walls, namely a first side wall 33 and a second side wall 34. Figure 1 and Figure 2 As shown, the top wall 31, the bottom wall 32 and the first side wall 33 are integrally cast with the cover 10 of the housing of the transmission system, and the second side wall 34 is constructed as a separate baffle. Figure 6As shown, the second side wall 34 is constructed as a planar baffle with a curved cross section, and is fixedly connected to the bottom wall 32 by means of a fixing portion 342 at the lower edge of the baffle, preferably by screwing or riveting. Thus, a channel is formed that is substantially closed along the length direction and has a substantially rectangular cross section. A protrusion 341 extending outward is also provided on the second side wall 34, and the protrusion 341 includes a plurality of reinforcement portions extending radially. The protrusion 341 will be described in detail below.

[0038] like Figure 1 As shown, the housing wall of the main housing partially surrounds the first gear 11 , and at the inlet 3 a of the fluid channel 3 , the extension line of the top wall 31 is tangent to the housing wall surrounding the first gear 11 of the reducer 1 .

[0039] For clarity, Figure 2 The top wall 31 of the fluid channel 3 is hidden in the figure, so that the interior of the fluid channel 3 is more clearly shown.

[0040] The outlet 3b of the fluid channel 3 is located at the end of the fluid channel 3, extends downward from the bottom wall 32, and is connected to the hollow cavity of the motor shaft 21. Figure 5 As shown, the cavity of the outlet 3b is basically vertically connected to the hollow cavity of the motor shaft, thereby forming a main channel of the fluid channel 3. The lubricating medium thrown out by the first gear 11 passes from the inlet 3a through the main channel and from the outlet 3b into the hollow cavity of the motor shaft 21.

[0041] In addition, the bottom wall 32 includes an upwardly protruding stop rib 32a, which extends along the width direction of the fluid channel 3 upstream of the outlet 3b. Correspondingly, the raised portion 341 of the second side wall 34 includes a branch outlet 341a constructed as a through hole, thereby forming a branch channel through the stop rib 32a and the branch outlet 341a of the raised portion 341.

[0042] When the transmission system is working, the first gear 11 of the reducer 1 rotates, and the lubricating medium in the sump 4 is rolled upward with its lower part, thereby realizing lubrication of the first gear 11 and even other gears of the transmission system. The lubricating medium thrown out tangentially by the first gear 11 enters the fluid channel 3 from the inlet 3a of the fluid channel 3. As the motor shaft 21 of the motor 2 rotates, negative pressure is formed in the hollow cavity of the motor shaft 21, and the hollow cavity is connected to the outlet 3b of the fluid channel 3. Therefore, the lubricating medium in the fluid channel 3 is continuously sucked into the hollow cavity of the motor shaft 21 under the action of negative pressure, and is output from the hollow cavity to the external winding through the radially extending perforation 21a, thereby cooling the motor 21.

[0043] In addition, a portion of the lubricating medium flowing in the fluid channel 3 is intercepted by the stop rib 32a and flows outward from the branch outlet 341a. Figure 6 In the illustrated embodiment, the branch outlet 341 a points downward, so that the lubricating medium flowing out through the branch channel is output to the components located below the fluid channel 3 to lubricate them, and finally falls and is collected in the sump 4 below.

[0044] As a result, the lubricating medium can be actively guided from the reducer 1 to the electric motor 2 without an additional pump device, thereby achieving the dual functions of lubrication and cooling with a simple structure.

[0045] According to another aspect of the present invention, a vehicle is provided, which includes the above-mentioned transmission system. The vehicle may be a plug-in hybrid electric vehicle, or it may also be a battery electric vehicle or other types of motor vehicles. Based on the above, the vehicle can realize the functions of the motor components and the motor as described above, and has the advantages as described above.

[0046] Certain features, structures or characteristics in one or more embodiments of the present application may be appropriately combined.

[0047] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0048] The above is an explanation of the present invention and should not be considered as a limitation thereof. Although several exemplary embodiments of the present invention have been described, it will be readily appreciated by those skilled in the art that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present invention. Therefore, all of these modifications are intended to be included within the scope of the present invention as defined in the claims. It should be understood that the above is an explanation of the present invention and the present invention should not be considered to be limited to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the present invention.

[0049] List of Reference Numerals

[0050] 1 Reducer

[0051] 10 cover

[0052] 11 First Gear

[0053] 2 Electric motor

[0054] 21 Motor shaft

[0055] 21a Perforation

[0056] 3 Fluid channels

[0057] 3a Entrance

[0058] 3b Exit

[0059] 31 Top wall

[0060] 32 bottom wall

[0061] 32a Stop rib

[0062] 33 First side wall

[0063] 34 Second side wall

[0064] 341 raised part

[0065] 341a bypass exit

[0066] 342 Fixed part.

Claims

1. A transmission system for a vehicle, comprising: A housing, comprising a main housing and a cover (10); A reducer (1) and an electric motor (2) arranged in the housing; a lubrication system, the lubrication system being arranged in the housing and comprising: A fluid channel (3) extending between the reducer (1) and the motor (2), The invention is characterized in that the fluid channel (3) extends from the first gear (11) of the reducer (1) to the motor shaft (21) of the motor (2) so as to guide the lubricating medium to the motor (2) via the fluid channel (3) so as to cool the motor (2).

2. The transmission system according to claim 1, characterized in that: The fluid channel (3) comprises a bottom wall (32) and a first side wall (33), and the bottom wall (32) and the first side wall (33) are integrally constructed with the cover portion of the housing.

3. The transmission system according to claim 2, characterized in that: The lubrication system comprises a baffle, which forms a second side wall (34) of the fluid channel (3) away from the housing, and the second side wall is fixedly connected to the bottom wall (32).

4. The transmission system according to claim 1, characterized in that: The inlet (3a) of the fluid channel (3) points to the first gear (11) of the reducer (1) to receive the lubricating medium transmitted from the first gear of the reducer (1), and then can be input into the fluid channel (3) through the inlet.

5. The transmission system according to claim 4, characterized in that: The housing wall of the main housing at least partially surrounds the first gear (11), and at the entrance of the fluid channel (3), the extension line of the top wall (31) of the fluid channel (3) is tangent to the housing wall surrounding the first gear (11).

6. The transmission system according to claim 2, characterized in that: The outlet (3b) of the fluid channel (3) extends downward from the bottom wall (32) of the fluid channel (3) and is in communication with the hollow cavity of the motor shaft (21).

7. The transmission system according to claim 6, characterized in that: The hollow cavity comprises at least one through hole (21a) extending in the radial direction.

8. The transmission system according to claim 7, characterized in that: The rotation of the motor shaft (21) generates negative pressure in the hollow cavity, thereby sucking the lubricating medium from the reducer (1) to the motor (2) via the fluid channel (3).

9. The transmission system according to claim 1, characterized in that: The fluid channel (3) comprises a stop rib (32a) arranged on a bottom wall (32) and a branch channel cooperating with the bottom wall (32) for diverting the lubricating medium guided in the fluid channel (3).

10. The transmission system according to claim 9, characterized in that: The branch channel includes a hollow protrusion (341) extending outward from the second side wall (34), wherein the protrusion (341) includes a branch outlet (341a).

11. The transmission system according to claim 1, characterized in that: The first gear (11) is a reducer gear.

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

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