Oil baffle structure for transmission and vehicle
By introducing an expansion and guide chamber into the oil baffle structure of the transmission, the problem of large oil consumption in the transmission assembly is solved, achieving stable oil level and vehicle weight reduction.
Patent Information
- Application Number
- CN202520273151.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-02-20
AI Technical Summary
In existing technologies, the large amount of oil used in transmission assemblies leads to increased vehicle weight and cost.
Design an oil baffle structure for a transmission, including an oil baffle housing and an oil outlet line. The oil baffle housing has an expansion chamber and an oil guide chamber. The oil guide chamber has an oil inlet and an oil outlet line, which are used to separate the P2 motor chamber from the transmission chamber. The oil is introduced from the P2 motor chamber into the transmission chamber through the oil inlet and the oil outlet line, thereby reducing the oil storage space.
It effectively ensures the oil level in the transmission chamber, prevents the oil suction port of the filter from being exposed, reduces the amount of oil used in the transmission assembly, and reduces the weight and cost of the whole vehicle.
Smart Images
Figure CN223578796U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to vehicle technical field, more specifically, relate to a kind of oil retaining structure for transmission and vehicle. BACKGROUND
[0002] The hybrid electric vehicle combines engine and motor power sources together through power coupling device to provide power for the vehicle, wherein the hybrid power special transmission is the key. The bottom of the transmission housing has oil, when the vehicle is running at high speed, the output shaft and differential of the transmission rotate at high speed in the oil, the high-speed rotation of the shaft teeth on the output shaft and the gear teeth of the differential stirs the oil, which can make the oil splash everywhere in the transmission housing.
[0003] In order to shield and guide the oil stirring movement of the output shaft gear teeth inside the transmission, and shorten the path of oil splashing, the prior art adds an oil guide plate on the periphery of the output shaft of the transmission, which is arranged between the P2 motor chamber and the transmission chamber.
[0004] The P2 motor chamber and the transmission chamber are connected chambers. In the emergency braking condition of the vehicle, the oil in the transmission chamber will flow into the P2 motor chamber, causing the oil in the transmission chamber to decrease, and even causing the oil suction port of the suction filter to be exposed, so the oil amount of the transmission chamber needs to be increased to ensure the oil level, resulting in a large amount of oil used by the transmission assembly, increasing the weight and cost of the vehicle. SUMMARY
[0005] The utility model aims at providing an oil retaining structure for transmission and vehicle, which solves the technical problem of large amount of oil used by the transmission assembly in the prior art.
[0006] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of providing an oil retaining structure for transmission, which is used for being installed between P2 motor chamber and transmission chamber to separate the P2 motor chamber and the transmission chamber, comprising:
[0007] An oil retaining housing having an expansion chamber and an oil guiding chamber; the expansion chamber is a closed chamber; the oil guiding chamber has an oil inlet communicating with the P2 motor chamber; and
[0008] An oil outlet pipeline connected to the side of the oil retaining housing facing the transmission chamber and communicating with the oil guiding chamber; the pipe diameter of the oil outlet pipeline is smaller than the caliber of the oil inlet.
[0009] In a possible implementation, the oil retaining housing comprises:
[0010] A housing body formed with the expansion chamber and the oil guiding chamber; the side of the housing body facing the P2 motor chamber is an open surface; and
[0011] A cover is arranged on the opening surface and blocks the expansion chamber so that the expansion chamber is a closed chamber.
[0012] In some embodiments, the shell body is a circular ring structure and is arranged around an output shaft of the transmission.
[0013] The expansion chamber comprises a first expansion chamber in a semicircular ring shape, and the first expansion chamber is located in a lower half of the shell body.
[0014] The cover comprises a first cover plate matched with the first expansion chamber, and the first cover plate blocks the first expansion chamber.
[0015] In some embodiments, the oil guiding chamber comprises a first oil guiding chamber, and the first oil guiding chamber is located at a radial periphery of the first expansion chamber.
[0016] The oil outlet pipeline comprises a first pipeline in communication with the first oil guiding chamber.
[0017] In some embodiments, the first cover plate has an oil guiding portion, the oil guiding portion blocks part of the first oil guiding chamber, and the oil guiding portion extends obliquely towards the inside of the first oil guiding chamber.
[0018] In some embodiments, the oil guiding chamber further comprises a second oil guiding chamber, and the second oil guiding chamber is located in an upper half of the shell body; and the oil outlet pipeline further comprises a second pipeline in communication with the second oil guiding chamber.
[0019] In some embodiments, the expansion chamber further comprises a second expansion chamber, and the second expansion chamber is located in an upper half of the shell body.
[0020] The cover further comprises a second cover plate blocking the second expansion chamber.
[0021] In a possible implementation, the bottom of the oil blocking shell body is provided with an oil passing hole, and a one-way valve is connected at the oil passing hole.
[0022] The transmission oil blocking structure has the following beneficial effects: compared with the prior art, the transmission oil blocking structure has an expansion chamber and an oil guiding chamber in the oil blocking shell body, the oil guiding chamber has an oil inlet and is further connected with an oil outlet pipeline, and oil in the P2 motor chamber can flow into the transmission chamber through the oil inlet, the oil guiding chamber and the oil outlet pipeline, so as to ensure the oil level of the transmission chamber; in addition, the expansion chamber can also occupy part of the space of the P2 motor chamber and / or the transmission chamber, and accordingly, the oil storage space of the P2 motor chamber and / or the transmission chamber is reduced, and the oil consumption of the transmission assembly is further reduced, and the weight and cost of the whole vehicle are reduced.
[0023] The utility model also provides a vehicle, including the oil retaining structure for transmission of above.
[0024] The vehicle provided by the utility model can ensure the oil level of the transmission chamber, avoid the exposure of the oil suction port of the suction filter, and reduce the oil consumption of the transmission assembly and the weight and cost of the whole vehicle. BRIEF DESCRIPTION OF DRAWINGS
[0025] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.
[0026] Figure 1 The structural diagram of the oil retaining structure for transmission provided by the utility model embodiment Figure 1 ;
[0027] Figure 2 The structural diagram of the oil retaining structure for transmission provided by the utility model embodiment Figure 2 ;
[0028] Figure 3 The sectional view structural diagram of the installation position of the oil retaining structure for transmission provided by the utility model embodiment
[0029] Figure 4 The explosion structural diagram of the oil retaining structure for transmission provided by the utility model embodiment
[0030] Figure 5 The structural diagram of the shell main body of the oil retaining structure for transmission provided by the utility model embodiment
[0031] Figure 6 The enlarged structural diagram of the middle circle A Figure 1
[0032] In the drawing,
[0033] 1, oil retaining shell body;11, shell main body;12, cover;121, first cover plate;1211, oil guiding part;122, second cover plate;13, expansion chamber;131, first expansion chamber;132, second expansion chamber;14, oil guiding chamber;141, first oil guiding chamber;142, second oil guiding chamber;15, oil inlet;16, oil passing hole;17, one-way valve;18, cylinder sleeve;
[0034] 2, oil outlet pipeline;21, first pipeline;22, second pipeline;
[0035] 3, P2 motor chamber; 4, transmission chamber. DETAILED DESCRIPTION
[0036] In order to make the technical problems, technical solutions and beneficial effects of the utility model to be solved more clear and explicit, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.
[0037] Please refer to Figures 1 to 3 , now the oil blocking structure for the transmission is described. The oil blocking structure for the transmission is used to be installed between the P2 motor chamber 3 and the transmission chamber 4 to block the P2 motor chamber 3 and the transmission chamber 4, comprising an oil blocking shell 1 and an oil outlet pipeline 2. The oil blocking shell 1 has an expansion chamber 13 and an oil guiding chamber 14; the expansion chamber 13 is a closed chamber; the oil guiding chamber 14 has an oil inlet 15 communicating with the P2 motor chamber 3; the oil outlet pipeline 2 is connected on the side of the oil blocking shell 1 facing the transmission chamber 4 and communicates with the oil guiding chamber 14; the pipe diameter of the oil outlet pipeline 2 is smaller than the caliber of the oil inlet 15.
[0038] In new energy vehicles, the P2 motor can work with the engine or the transmission to realize multiple functions. For example, it provides electric power assistance during starting and low-speed driving to improve the power performance and fuel economy of the vehicle; during brake energy recovery, the energy generated by the vehicle braking is converted into electrical energy and stored, etc. The P2 motor is usually located at the input end of the transmission.
[0039] The P2 motor chamber 3 is mainly used to accommodate the motor and its related components, such as the motor stator, rotor, etc., to ensure that the motor can operate normally and exert its function. The transmission chamber 4 is used to accommodate various gears, shafts and other transmission components of the transmission to realize the function of variable speed of different gears.
[0040] In some designs, the two chambers may be connected and work together through a specific interface or structure to ensure smooth and efficient power transmission between the motor and the transmission. The P2 motor chamber 3 is usually spatially related to the transmission chamber 4 and has a certain separation.
[0041] The oil blocking structure for the transmission is used to block the P2 motor chamber 3 and the transmission chamber 4. Specifically, the oil blocking shell 1 is located at the radial periphery of the transmission output shaft, one side of which faces the P2 motor chamber 3 and the other side of which faces the transmission chamber 4, as shown in Figure 3 The transmission chamber 4 and the P2 motor chamber 3 are both filled with oil. The P2 motor chamber 3 has an oil stirring wheel that can stir the oil in the P2 motor chamber 3.
[0042] The expansion chamber 13 and the oil guiding chamber 14 are both expanded along the axial direction of the transmission output shaft; the expansion chamber 13 is a closed chamber, which is not communicated with the P2 motor chamber 3 and the transmission chamber 4, that is, there is no oil in the expansion chamber 13, and the expansion chamber 13 only occupies the oil storage space of the P2 motor chamber 3 and / or the transmission chamber 4.
[0043] The oil guiding chamber 14 is communicated with the P2 motor chamber 3 and the transmission chamber 4. The oil guiding chamber 14 has an oil inlet 15 facing the P2 motor chamber 3, and an oil outlet pipeline 2 extending into the transmission chamber 4. The oil stirred by the oil stirring wheel can enter the oil guiding chamber 14 through the oil inlet 15 and flow into the transmission chamber 4 through the oil outlet pipeline 2; since the diameter of the oil inlet 15 is larger than the diameter of the oil outlet pipeline 2 (specifically, the diameter of the oil inlet 15 is much larger than the diameter of the oil outlet pipeline 2), and the oil outlet pipeline 2 extends into the transmission chamber 4, under the action of the oil stirring wheel and the oil flow pressure, the oil can only flow from the P2 motor chamber 3 to the transmission chamber 4, and cannot flow in the opposite direction.
[0044] It should be noted that, for the oil blocking shell 1, the volume occupied by the expansion chamber 13 is much larger than the volume occupied by the oil guiding chamber 14, in other words, the oil storage capacity of the oil guiding chamber 14 is very small, and only a small part of the oil in the P2 motor chamber 3 can be guided into the transmission chamber 4. The main function of the oil blocking shell 1 is to occupy the oil storage space of the P2 motor chamber 3 and / or the transmission chamber 4, so as to reduce the total oil consumption of the transmission assembly.
[0045] Compared with the prior art, the oil blocking structure for the transmission provided by the utility model has the oil blocking shell 1 with the expansion chamber 13 and the oil guiding chamber 14, the oil guiding chamber 14 has the oil inlet 15 and is further connected with the oil outlet pipeline 2, the oil in the P2 motor chamber 3 can flow into the transmission chamber 4 through the oil inlet 15, the oil guiding chamber 14 and the oil outlet pipeline 2, so as to ensure the oil level of the transmission chamber 4 and avoid the oil suction port of the suction filter being exposed; in addition, the expansion chamber 13 can also occupy part of the space of the P2 motor chamber 3 and / or the transmission chamber 4, accordingly, the oil storage space of the P2 motor chamber 3 and / or the transmission chamber 4 is reduced, and then the oil consumption of the transmission assembly is reduced, and the weight and cost of the whole vehicle are reduced.
[0046] In some embodiments, the above-mentioned oil blocking shell 1 can adopt the structure as shown in Figure 1 , Figure 2 and Figure 4 , and the specific structure is shown in Figure 1 , Figure 2 and Figure 4The oil baffle housing 1 includes a housing body 11 and a cover 12; the housing body 11 forms an expansion chamber 13 and an oil guiding chamber 14; the side of the housing body 11 facing the P2 motor chamber 3 is an open surface; the cover 12 is placed on the open surface and seals the expansion chamber 13 so that the expansion chamber 13 is a closed chamber.
[0047] The housing body 11 is located radially around the output shaft of the transmission and mainly serves to block oil flow. Additionally, the housing body 11 extends axially along the output shaft to form an expansion chamber 13 and an oil guiding chamber 14. The housing body 11 is designed with an open structure on one side, which is simple in structure, easy to form the expansion chamber 13 and the oil guiding chamber 14, and easy to manufacture.
[0048] The cap 12 completely seals the expansion chamber 13, thus sealing the expansion chamber 13. The cap 12 may also partially cover the oil guiding chamber 14, or it may not cover the oil guiding chamber 14 at all. If the cap 12 partially covers the oil guiding chamber 14, then the part of the cap 12 that is not covered is the oil inlet 15; if the cap 12 does not cover the oil guiding chamber 14 at all, then the opening of the oil guiding chamber 14 is the oil inlet 15. Therefore, there is no need to specifically provide an oil inlet 15 on the cap 12 and the shell body 11.
[0049] In some embodiments, the shell body 11 may be adopted as follows: Figure 4 and Figure 5 The structure shown is described in the following document. Figure 4 and Figure 5 The main body 11 is a circular structure and is arranged around the output shaft of the transmission; the expansion chamber 13 includes a semi-circular first expansion chamber 131, which is located in the lower half of the main body 11; the cover 12 includes a first cover plate 121 adapted to the first expansion chamber 131, which seals the first expansion chamber 131.
[0050] Oil accumulates in the lower half of the P2 motor chamber 3 and the transmission chamber 4. The first expansion chamber 131, adapted to the oil location, is also located in the lower half of the housing body 11. In addition, the first expansion chamber 131 is designed as a semi-circular annular structure, which maximizes its radial area while avoiding the transmission output shaft, thereby increasing the space it occupies.
[0051] It should be noted that the shell body 11 can be axially expanded only in the lower half, or it can be axially expanded in both the lower and upper halves, as long as it can form a semi-circular first expansion chamber 131.
[0052] The first cover plate 121 is also semi-circular in shape, completely sealing off the first expansion chamber 131. In addition, the first cover plate 121 also serves to prevent oil from entering.
[0053] Please see Figure 4 andFigure 5 Based on the above embodiments, the oil guiding chamber 14 includes a first oil guiding chamber 141, which is located radially around the first expansion chamber 131; the oil outlet pipeline 2 includes a first pipeline 21 that communicates with the first oil guiding chamber 141.
[0054] The first oil guiding chamber 141 is not connected to the first expansion chamber 131, but is arranged adjacent to it, separated by a partition or reinforcing ribs. The first oil guiding chamber 141 is located radially outside the first expansion chamber 131, which simplifies the structure of the shell body 11, reduces the number of internal ribs of the shell body 11, and makes it easier to design and manufacture. In addition, the first cover plate 121 can be extended so that the first cover plate 121 blocks part of the opening of the first oil guiding chamber 141, that is, correspondingly reduces the opening area of the oil inlet 15.
[0055] The first pipeline 21 corresponds to the first oil guiding chamber 141, and the oil inlet end of the first pipeline 21 is located on the bottom surface of the first oil guiding chamber 141. It can be understood that an oil gathering groove is designed on the bottom wall of the first oil guiding chamber 141, and the oil inlet end of the first pipeline 21 is directly opposite the oil gathering groove.
[0056] In some embodiments, the first cover plate 121 described above may be as follows: Figure 4 and Figure 6 The structure shown is described in the following document. Figure 4 and Figure 6 The first cover plate 121 has an oil guiding part 1211, which blocks part of the first oil guiding chamber 141, and the oil guiding part 1211 extends inclinedly into the first oil guiding chamber 141.
[0057] The oil guide section 1211 blocks part of the opening of the first oil guide chamber 141, thereby reducing the opening area of the oil inlet 15 and preventing a large amount of oil from accumulating in the first oil guide chamber 141 and lowering the oil level of the P2 motor chamber 3.
[0058] The oil guiding section 1211 extends inclinedly into the first oil guiding chamber 141, serving to guide the flow of oil. Specifically, the oil stirred up by the oil stirring wheel hits the first cover plate 121, and the oil dripping onto the oil guiding section 1211 is guided into the first oil guiding chamber 141 along the inclined direction of the oil guiding section 1211.
[0059] In some embodiments, the shell body 11 may also adopt the following: Figure 4 and Figure 5 The structure shown is described in the following document. Figure 4 and Figure 5 The oil guiding chamber 14 also includes a second oil guiding chamber 142, which is located in the upper half of the shell body 11; the oil outlet pipeline 2 also includes a second pipeline 22 that communicates with the second oil guiding chamber 142.
[0060] Since the first expansion chamber 131 is a semi-circular ring, and the first oil guide chamber 141 is located at the radial periphery of the first expansion chamber 131, in order to increase the expansion volume of the shell body 11 (that is, to increase the oil space of the shell body 11), the first expansion chamber 131 can only be increased as much as possible, and accordingly the volume of the first oil guide chamber 141 will be reduced, resulting in insufficient oil flow of the first oil guide chamber 141. In order to utilize the oil liquid stirred by the oil stirring wheel, the second oil guide chamber 142 is additionally provided on the upper half of the shell body 11, and a small part of the stirred oil liquid can enter the transmission chamber 4 through the second oil guide chamber 142. The addition of the second oil guide chamber 142 not only makes full use of the circular ring structure of the shell body 11, but also ensures the oil flow of the oil guide chamber 14.
[0061] The second pipeline 22 corresponds to the second oil guide chamber 142, and the oil inlet end of the second pipeline 22 is located at the bottom surface of the second oil guide chamber 142. It can be understood that an oil collecting groove is designed on the bottom wall of the second oil guide chamber 142, and the oil inlet end of the second pipeline 22 is opposite to the oil collecting groove.
[0062] In some embodiments, the above-mentioned shell body 11 can also adopt the structure as shown in Figure 4 and Figure 5 , referring to Figure 4 and Figure 5 , the expansion chamber 13 further comprises a second expansion chamber 132, and the second expansion chamber 132 is located on the upper half of the shell body 11; the cover 12 further comprises a second cover plate 122 for blocking the second expansion chamber 132, and the second cover plate 122 also blocks part of the opening of the second oil guide chamber 142.
[0063] The second expansion chamber 132 and the second oil guide chamber 142 are both located on the upper half of the shell body 11, and the second expansion chamber 132 and the second oil guide chamber 142 are not communicated, but are only arranged adjacent to each other, and are isolated by a partition plate or a reinforcing rib plate. In addition, the second expansion chamber 132 and the first expansion chamber 131 are spaced apart in the upward and downward directions, and the transmission output shaft is located between the two.
[0064] Since the shell body 11 is a circular ring, the addition of the second expansion chamber 132 on the upper half of the shell body 11 can increase the overall strength of the shell body 11 and improve the connection strength of the shell body 11 and the transmission assembly.
[0065] The second cover plate 122 is adapted to the shape of the second expansion chamber 132, and part of it extends outward to block part of the opening of the second oil guide chamber 142. The second cover plate 122 also plays a role in blocking oil.
[0066] In some embodiments, the above-mentioned oil blocking structure for transmission can also adopt the structure as shown in Figures 2 to 5 , referring to Figures 2 to 5The bottom of the oil blocking shell 1 is provided with an oil passing hole 16, and a one-way valve 17 is connected at the oil passing hole 16.
[0067] The one-way valve 17 is one-way conducted from the P2 motor chamber 3 to the transmission chamber 4. In the normal working condition, if there is a pressure difference between the P2 motor chamber 3 and the transmission chamber 4, part of the oil in the P2 motor chamber 3 passes through the oil passing hole 16 and pushes the one-way valve 17 to open, and flows into the transmission chamber 4.
[0068] In the emergency braking working condition of the vehicle, even if the oil in the transmission chamber 4 flows into the P2 motor chamber 3, at this time the one-way valve 17 is closed, and only a small amount of oil can flow into the P2 motor chamber 3 from the outer peripheral gap of the shell main body 11, so that the oil level in the transmission chamber 4 is prevented from falling too much.
[0069] The one-way valve 17 can be a valve structure fixed in the inside of the oil passing hole 16, or can be a valve plate structure rotationally arranged on the side of the oil blocking shell 1 facing the transmission chamber 4 and buckled to the end of the oil passing hole 16. The specific structure and position of the one-way valve 17 are not limited in the embodiment, as long as the one-way opening function is provided.
[0070] In some embodiments, the above-mentioned oil blocking shell 1 can also adopt the structures shown in Figure 4 and Figure 5 , referring to Figure 4 and Figure 5 , a plurality of cylinder sleeves 18 are connected in the expansion chamber 13. Each cylinder sleeve 18 is integrally formed with the shell main body 11.
[0071] Each cylinder sleeve 18 has a mounting cavity, and the oil blocking shell 1 can be fixed on the transmission assembly by penetrating a fastener in the mounting cavity.
[0072] Based on the same inventive concept, the embodiment of the present application also provides a vehicle comprising the above-mentioned oil blocking structure for transmission.
[0073] The vehicle provided by the utility model has the above-mentioned oil blocking structure for transmission, can ensure the oil level of the transmission chamber 4, avoid the exposure of the oil suction port of the suction filter, and can also reduce the oil consumption of the transmission assembly, and reduce the weight and cost of the whole vehicle.
[0074] The above-mentioned is only a preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. An oil blocking structure for a transmission, for installation between a P2 motor chamber (3) and a transmission chamber (4) to block the P2 motor chamber (3) and the transmission chamber (4), characterized by, The oil blocking structure comprises: an oil blocking shell (1) having an expansion chamber (13) and an oil guiding chamber (14); the expansion chamber (13) is a closed chamber; the oil guiding chamber (14) has an oil inlet (15) communicating with the P2 motor chamber (3); and an oil outlet pipeline (2) connected to the side of the oil blocking shell (1) facing the transmission chamber (4) and communicating with the oil guiding chamber (14); the pipe diameter of the oil outlet pipeline (2) is smaller than the diameter of the oil inlet (15).
2. The oil retaining structure for a transmission according to claim 1, characterized by The oil blocking shell (1) comprises: a shell body (11) formed with the expansion chamber (13) and the oil guiding chamber (14); the side of the shell body (11) facing the P2 motor chamber (3) is an open surface; and a cover (12) covering the open surface and blocking the expansion chamber (13) so that the expansion chamber (13) is a closed chamber.
3. The oil retaining structure for a transmission according to claim 2, characterized in that, The shell body (11) is a circular ring structure and is arranged around the output shaft of the transmission; the expansion chamber (13) comprises a semicircular first expansion chamber (131) located in the lower half of the shell body (11); the cover (12) comprises a first cover plate (121) matched with the first expansion chamber (131), which blocks the first expansion chamber (131).
4. The oil retaining structure for a transmission according to claim 3, characterized in that The oil guiding chamber (14) comprises a first oil guiding chamber (141) located at the radial periphery of the first expansion chamber (131); the oil outlet pipeline (2) comprises a first pipeline (21) communicating with the first oil guiding chamber (141).
5. The oil retaining structure for a transmission according to claim 4, characterized in that, The first cover plate (121) has an oil guiding portion (1211) blocking part of the first oil guiding chamber (141), and the oil guiding portion (1211) extends obliquely into the first oil guiding chamber (141).
6. The oil retaining structure for a transmission according to claim 4, characterized in that The oil guiding chamber (14) further comprises a second oil guiding chamber (142) located in the upper half of the shell body (11); the oil outlet pipeline (2) further comprises a second pipeline (22) communicating with the second oil guiding chamber (142).
7. The oil retaining structure for a transmission according to claim 6, characterized in that, The expansion chamber (13) further comprises a second expansion chamber (132) located in the upper half of the shell body (11); the cover (12) further comprises a second cover plate (122) blocking the second expansion chamber (132).
8. The oil retaining structure for a transmission according to claim 1, characterized by The bottom of the oil blocking shell (1) is provided with an oil passing hole (16) connected with a one-way valve (17).
9. The oil retaining structure for a transmission according to claim 1, characterized by A plurality of cylinder sleeves (18) are connected in the expansion chamber (13).
10. A vehicle characterized by comprising: The oil blocking structure comprises: the transmission oil blocking structure according to any one of claims 1-9.