A transmission front cover and a transmission

Abstract

The present application belongs to a kind of transmission support and sealing structure, for the structure of traditional transmission front end cover, there is high risk of leakage, and the technical problems that part of oil passage poor flow capacity, provide a kind of transmission front end cover and transmission, front end cover body and valve body are integrated structure;First oil retaining structure and second oil retaining structure are both set in combination cavity, for the second vent plug hole in combination cavity after the combination of front end cover and transmission housing form shielding;Gap is left between first oil retaining structure and second oil retaining structure, for the second vent plug hole and combination cavity communication;Main oil pressure oil passage, forward gear clutch pressure oil passage, reverse gear clutch pressure oil passage, first gear clutch pressure oil passage and n gear clutch pressure oil passage are all located in valve body, and are independently set respectively.

Description

Technical Field

[0001] This invention pertains to a transmission support and sealing structure, specifically a transmission front cover and a transmission. Background Technology

[0002] With the rapid development of the automotive industry, automatic transmissions are becoming increasingly popular. The transmission front cover, as a core component of the automatic transmission, is used to install the transmission mechanism and other accessories, providing a sealed installation space for the transmission. Simultaneously, it connects the hydraulic valve body and various actuators to provide hydraulic oil circuits. However, traditional transmission front covers have the following problems: (1) the front cover and valve body are separate designs; (2) the vent hole is directly connected to the transmission cavity; and (3) all oil passages in the valve body have the same depth. Among these, (1) and (2) can lead to leakage risks in the transmission, and oil can easily accumulate in the weight-reduction groove; and (3) it restricts the flow capacity of some oil passages. Summary of the Invention

[0003] This invention addresses the technical problems of traditional transmission front cover structures, such as high leakage risk, easy accumulation of oil in the weight reduction groove, and poor flow capacity in some oil passages, by providing a transmission front cover and a transmission.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] A transmission front cover, comprising a front cover body and a valve body;

[0006] The front cover body is provided with a first vent hole and a filler hole. A groove is provided on the front surface of the front cover body. A connecting cavity is formed between the groove and the shell. The part of the front surface of the front cover body located outside the groove forms the shell connecting surface. The bottom of the groove is defined as the cavity end face. A second vent hole, an input shaft hole, a forward gear output shaft hole and a reverse gear output shaft hole are provided on the cavity end face.

[0007] The valve body and the front cover body are provided with a main oil pressure passage, a forward gear clutch pressure passage, a reverse gear clutch pressure passage, a first gear clutch pressure passage and n gear clutch pressure passages; n is an integer greater than or equal to 0;

[0008] It also includes a first oil baffle structure and a second oil baffle structure located around the second vent plug hole;

[0009] The front cover body and the valve body are an integral structure;

[0010] Both the first and second oil-blocking structures are located within the connecting cavity, serving to shield the second vent hole within the connecting cavity after the front cover is joined to the transmission housing; a gap is left between the first and second oil-blocking structures to allow the second vent hole to communicate with the connecting cavity.

[0011] The main hydraulic pressure passage, the forward gear clutch pressure passage, the reverse gear clutch pressure passage, the first gear clutch pressure passage, and the n gear clutch pressure passages are all located in the valve body and are set independently.

[0012] Furthermore, one end of the main hydraulic pressure passage, the forward gear clutch pressure passage, the reverse gear clutch pressure passage, the first gear clutch pressure passage, and the n gear clutch pressure passages are all located on the mating surface of the valve body.

[0013] A first weight-reducing groove is provided on the mating surface of the valve body, and the first weight-reducing groove is connected to the mating cavity.

[0014] Furthermore, the front end cover body is provided with a first oil unloading channel and a second oil unloading channel; one end of the first oil unloading channel and the second oil unloading channel are both located on the end face of the cavity, and the other end is respectively connected to the first oil unloading hole and the second oil unloading hole.

[0015] A second weight-reducing groove is provided on the mating surface of the valve body, and the second weight-reducing groove is connected to the second unloading oil passage through a second connecting hole.

[0016] Furthermore, the center of one end of the first oil discharge passage is located above and to the side of one end of the input shaft hole; and when the transmission is working, the flow range of the oil flowing out from one end of the first oil discharge passage can cover the rotating parts of the transmission inside the input shaft hole.

[0017] Furthermore, the inner wall of the filler hole is provided with threads of the same specifications as the lifting hole of the front cover of the transmission.

[0018] Furthermore, the depths of the main hydraulic pressure passage, the forward gear clutch pressure passage, the reverse gear clutch pressure passage, the first gear clutch pressure passage, and the n gear clutch pressure passages are different.

[0019] Furthermore, the depths of the main hydraulic oil passage, the forward gear clutch pressure oil passage, the reverse gear clutch pressure oil passage, the first gear clutch pressure oil passage, and the n gear clutch pressure oil passages are all the maximum depths under mutually independent structures.

[0020] Furthermore, the other end of the forward gear clutch pressure oil passage is connected to the forward gear output shaft hole through the forward gear clutch pressure oil hole in the valve body.

[0021] The other end of the reverse clutch pressure oil passage is connected to the reverse output shaft hole through the reverse clutch pressure oil hole in the valve body.

[0022] The other end of the first gear clutch pressure oil passage is connected to one end of the second gear clutch pressure oil passage through the first gear clutch pressure oil hole in the valve body. The other end of the second gear clutch pressure oil passage is located on the housing mating surface.

[0023] The other ends of the n gear clutch pressure oil passages are respectively connected to the forward gear output shaft hole or the reverse gear output shaft hole through the corresponding gear clutch pressure oil hole in the valve body.

[0024] Furthermore, a pre-drilled hole is provided on the end face of the cavity.

[0025] The present invention also proposes a transmission, wherein the front end cover of the transmission adopts the aforementioned transmission front end cover.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. This invention proposes a transmission front cover that integrates the valve body onto the transmission front cover body. Compared to existing transmission front cover structures, this improves the sealing performance of the hydraulic oil passages, reduces oil leakage, and thus enhances assembly efficiency. Furthermore, the integrated structure reduces assembly steps and improves manufacturing reliability. The first and second oil-blocking structures located around the second vent hole prevent transmission oil from entering the first and second vent holes, further improving sealing. Moreover, the main hydraulic pressure passage, forward clutch pressure passage, reverse clutch pressure passage, first gear clutch pressure passage, and n gear clutch pressure passages are independently configured. During machining, each passage can be individually cast to its maximum depth. Compared to traditional valve plates, this maximizes the flow area of ​​the oil passages, reduces pressure loss along the oil flow process, and simultaneously improves the system efficiency of the transmission.

[0028] 2. In this invention, a first weight-reducing groove communicating with the connecting cavity and a second weight-reducing groove communicating with the second unloading oil passage are provided on the mating surface of the valve body, which can ensure that the oil does not accumulate at the edge of the mating surface of the valve body and reduce the risk of leakage of the shell.

[0029] 3. In this invention, the front cover body is provided with a double oil discharge channel, which can ensure that the oil in the oil channel on the valve body returns smoothly to the oil pan.

[0030] 4. In this invention, the first unloading oil passage is located on the upper side of the input shaft hole, which can utilize the oil in the oil passage on the valve body to lubricate the rotating parts of the transmission.

[0031] 5. In this invention, the thread specifications of the oil filling hole and the lifting hole are the same, which is equivalent to the integrated design of the oil filling hole and the lifting hole. Lifting can be completed through the oil filling hole, which reduces the complexity of casting and machining and improves the utilization rate of the structure.

[0032] 6. The cavity end face of the present invention is also provided with a reserved hole, so that the front cover of the present invention can be applied to more types of transmissions and is more convenient for promotion and application.

[0033] 7. Based on the above-mentioned front cover of the transmission, the present invention also proposes a transmission that has all the advantages of the above-mentioned front cover, with excellent sealing performance, high efficiency and high reliability. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present invention;

[0036] Figure 2 for Figure 1 The main view;

[0037] Figure 3 This is a schematic diagram of the mating surface of the valve body in Embodiment 2 of the present invention;

[0038] Figure 4 This is a schematic diagram of the oil filling hole in Embodiment 2 of the present invention;

[0039] Figure 5 This is a schematic diagram of the forward gear clutch pressure oil passage and the second gear clutch pressure oil passage in Embodiment 2 of the present invention;

[0040] Figure 6 This is a schematic diagram of the reverse clutch pressure oil passage and the third gear clutch pressure oil passage in Embodiment 2 of the present invention;

[0041] Figure 7 This is a schematic diagram of the first oil unloading hole and the first oil unloading passage in Embodiment 2 of the present invention;

[0042] Wherein: 1-Front end cover body, 2-Valve body, 3-Housing mating surface, 4-Oil filling hole, 5a-First vent plug hole, 5b-Second vent plug hole, 5c-Oil baffle structure for the first vent plug hole, 5d-Oil baffle structure for the second vent plug hole, 6-Screw hole, 7-First unloading oil passage, 8-Second unloading oil passage, 9-Input shaft hole, 10-Forward gear output shaft hole, 11-Reverse gear output shaft hole, 12-Second first gear clutch pressure oil passage, 13-First unloading hole, 14-Main oil pressure hole, 15-Forward gear clutch pressure oil hole, 16-Reverse gear clutch pressure oil hole, 17- 18 - Second oil discharge hole; 19 - First gear clutch pressure oil hole; 20 - Third gear clutch pressure oil hole; 21 - Second gear clutch pressure oil hole; 22 - First connecting hole; 23 - Main oil pressure passage; 24 - Forward gear clutch pressure oil passage; 25 - Reverse gear clutch pressure oil passage; 26 - First gear clutch pressure oil passage; 27 - Third gear clutch pressure oil passage; 28 - Second gear clutch pressure oil passage; 29 - First weight reduction groove; 30 - Second weight reduction groove; 31 - Valve body mating surface threaded hole; 32 - Valve body mating surface; 33 - Mating cavity; 34 - Reserved hole. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0045] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0046] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0047] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0048] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0050] The front cover of the transmission mainly includes a front cover body 1 and a valve body 2. The front cover body 1 typically has a first vent hole 5a and a filler hole 4. A groove is formed on the front surface of the front cover body 1. After connecting the front cover to the housing, a cavity 33 is formed between the groove and the housing. The portion of the front surface of the front cover body 1 located around the groove forms a housing mating surface 3, which fits snugly against the housing after connection. The bottom of the groove is defined as the cavity end face. A second vent hole 5b, an input shaft hole 9, a forward gear output shaft hole, and a reverse gear output shaft hole are formed on the cavity end face, providing support and axial positioning for the input shaft assembly, forward gear output shaft assembly, and reverse gear output shaft assembly, respectively. The top of the front cover body 1 has the filler hole 4 and the first vent hole 5a. Furthermore, depending on the specific use of the front cover, when the transmission has different numbers of gears, the shaft holes corresponding to the output shafts of each gear can be shared with the forward gear output shaft holes and the reverse gear output shaft holes, respectively. For example, if the transmission has five gears, the output shaft holes of the second and third gears can be shared with the forward gear output shaft holes, and the output shaft holes of the fourth and fifth gears can be shared with the reverse gear output shaft holes; alternatively, the output shaft holes of the second and fourth gears can be shared with the forward gear output shaft holes, and the output shaft holes of the third and fifth gears can be shared with the reverse gear output shaft holes. The specific application of the shaft holes can be configured according to the transmission settings.

[0051] In a traditional transmission front cover, a sealing gasket is typically added between the valve body 2 and the front cover body 1, and then the parts are fastened with bolts. Between the valve body 2 and the front cover body 1, there are main hydraulic pressure passages 23, forward gear clutch pressure passages 24, reverse gear clutch pressure passages 25, first gear clutch pressure passages 26, and n gear clutch pressure passages; n is an integer greater than or equal to 0. If there is only one gear, then n = 0; if there are more than one gear, then n ≥ 1. Specifically, n equals the number of gears minus one.

[0052] The mating surface 32 of the valve body 2 is mated with the large surface of the valve plate, and is fastened to the valve plate by bolts in the 16 threaded holes 31 on the valve body mating surface. Of course, the specific connection method between the valve body 2 and the valve plate can also be other forms.

[0053] Example 1

[0054] like Figure 1 and Figure 2As shown, Embodiment 1 is a basic embodiment of the present invention, a transmission front cover. In addition to the above-described structures, the front cover body 1 and valve body 2 also include a first oil-blocking structure 5c and a second oil-blocking structure 5d. The first oil-blocking structure 5c and the second oil-blocking structure 5d are located around the second vent hole 5b, and the first vent hole 5a and the second vent hole 5b are connected for ventilation. Both the first oil-blocking structure 5c and the second oil-blocking structure 5d are disposed within the connecting cavity 33, so that after the front cover is combined with the transmission housing, they form a shield for the second vent hole 5b within the connecting cavity 33, ensuring that transmission fluid does not splash into the first vent hole 5a and the second vent hole 5b, reducing the leakage risk of the first vent hole 5a and the second vent hole 5b, and improving sealing. A gap is left between the first oil-blocking structure 5c and the second oil-blocking structure 5d for communication between the second vent hole 5b and the connecting cavity 33.

[0055] In Embodiment 1, unlike conventional transmission front covers, the front cover body 1 and valve body 2 are an integrated structure. The valve body 2 is integrally cast onto the front cover body 1, directly connecting the corresponding oil passages between the valve body 2 and the front cover body 1 to provide pressurized oil and lubricating oil to the transmission actuators. Unlike traditional transmission front covers, which use gaskets between the valve body and the front cover body and are then secured with bolts, the integrated structure in Embodiment 1 reduces the use of gaskets and bolts, decreases component costs and assembly steps, improves manufacturing reliability, enhances sealing performance, reduces leakage, and increases the overall efficiency ratio.

[0056] The main hydraulic pressure passage 23, the forward gear clutch pressure passage 24, the reverse gear clutch pressure passage 25, the first gear clutch pressure passage 26, and the n gear clutch pressure passages are all located within the valve body 2 and are independently configured. Each passage in the valve body 2 can be cast separately. Compared to the valve body in the front cover of a traditional transmission, this increases the depth of each passage, improves the flow area, reduces pressure loss along the path, and thus improves system efficiency.

[0057] Therefore, Embodiment 1 provides a transmission front cover structure that is highly sealed and reliable, easy to assemble, and has high system efficiency.

[0058] Example 2

[0059] Embodiment 2 is a specific embodiment of the present invention. In Embodiment 2, the transmission corresponding to the front cover is provided with three forward gears and three reverse gears. The output shaft hole for second gear is shared with the output shaft hole 10 for forward gears, and the output shaft hole for third gear is shared with the output shaft hole 11 for reverse gears.

[0060] like Figure 3As shown, the gear clutch pressure oil passages include a second-gear clutch pressure oil passage 28 and a third-gear clutch pressure oil passage 27. One end of the main oil pressure oil passage 23, the forward gear clutch pressure oil passage 24, the reverse gear clutch pressure oil passage 25, the first gear clutch pressure oil passage 26, the second gear clutch pressure oil passage 28, and the third gear clutch pressure oil passage 27 are all located on the mating surface 32 of the valve body 2. The bottom of the main oil pressure oil passage 23 has a main oil pressure oil hole 14; the bottom of the forward gear clutch pressure oil passage 24 has a forward gear clutch pressure oil hole 15; the bottom of the reverse gear clutch pressure oil passage 25 has a reverse gear clutch pressure oil hole 16; the bottom of the first gear clutch pressure oil passage 26 has a first gear clutch pressure oil hole 19; the bottom of the second gear clutch pressure oil passage 28 has a second gear clutch pressure oil hole 21; and the bottom of the third gear clutch pressure oil passage 27 has a third gear clutch pressure oil hole 20. The main oil pressure is supplied to the valve body 2 through the main oil pressure oil hole 14. Figure 5 As shown, the forward gear clutch pressure oil passage 24 is connected to the forward gear output shaft hole 10 through the forward gear clutch pressure oil hole 15, providing pressure oil to the forward gear clutch; the second gear clutch pressure oil passage 28 is connected to the forward gear output shaft hole 10 through the second gear clutch pressure oil hole 21, providing pressure oil to the second gear clutch. Figure 6 As shown, the reverse clutch pressure oil passage 25 is connected to the reverse output shaft hole 11 via the reverse clutch pressure oil hole 16, providing pressure oil to the reverse clutch; the third gear clutch pressure oil passage 27 is connected to the reverse output shaft hole 11 via the third gear clutch pressure oil hole 20, providing pressure oil to the third gear clutch. The first gear clutch pressure oil passage 26 is connected to the corresponding oil hole on the transmission housing via the first gear clutch pressure oil hole 19 and the second first gear clutch pressure oil passage 12, providing pressure oil to the first gear clutch. The second first gear clutch pressure oil passage 12 is located on the front cover body 1. One end of the second first gear clutch pressure oil passage 12 is connected to the first gear clutch pressure oil hole 19, and the other end is located on the housing mating surface 3.

[0061] The front cover body 1 has a first oil discharge passage 7 and a second oil discharge passage 8, and the valve body 2 has a first oil discharge hole 13 and a second oil discharge hole 17. One end of the first oil discharge passage 7 and the second oil discharge passage 8 are both located on the end face of the cavity. Figure 7 As shown, the first oil discharge hole 13 is connected to the first oil discharge passage 7, and the second oil discharge hole 17 is connected to the second oil discharge passage 8, ensuring that the oil in the valve body oil passage returns smoothly to the oil pan. As a preferred embodiment, the first oil discharge passage 7 is located to the upper left of the input shaft hole 9 (position description based on...). Figure 2 (In the orientation of the image), the oil will flow into the rotating parts of the transmission through the first unloading oil passage 7, providing them with cooling and lubrication flow. In Embodiment 2, a dual unloading oil passage design is added to the front cover to ensure that the oil in the valve body oil passage returns smoothly to the oil pan, while using this part of the oil to lubricate the rotating parts of the transmission.

[0062] To reduce the overall weight of the front cover body 1, two weight-reducing grooves are provided on the valve body mating surface 32 of the valve body 2, referred to as the first weight-reducing groove 29 and the second weight-reducing groove 30, respectively. The first weight-reducing groove 29 and the second weight-reducing groove 30 are both located at the edge of the valve body mating surface 32. Under the condition of long-term operation of the transmission, a large amount of oil will accumulate in the first weight-reducing groove 29 and the second weight-reducing groove 30, which will cause the risk of oil leakage. To solve this problem, a first connecting hole 22 and a second connecting hole 18 are respectively opened at the bottom of the first weight-reducing groove 29 and the second weight-reducing groove 30. The first weight-reducing groove 29 is connected to the mating cavity 33 through the first connecting hole 22, and the second weight-reducing groove 30 is connected to the second oil discharge passage 8 through the second connecting hole 18. Through the first connecting hole 22 and the second connecting hole 18, the accumulated oil will return to the oil pan, reducing the risk of oil leakage in the first weight-reducing groove 29 and the second weight-reducing groove 30. Therefore, the first weight reduction groove 29 and the second weight reduction groove 30 are not only for weight reduction. Combined with the first connecting hole 22 and the second connecting hole 18, they can also prevent oil leakage. Their positions are determined based on the actual situation of the transmission. They do not affect the normal operation of the valve body 2, and can also prevent leakage.

[0063] In addition, as a preferred embodiment of the second embodiment, a reserved hole 34 is also provided on the end face of the cavity. If other shafts need to be installed, they can be set in the reserved hole, which provides more possibilities for the use of the present invention.

[0064] In other embodiments of the present invention, if the specific number of gears changes, the oil passages for each gear can be adjusted accordingly. Furthermore, the specific shape and orientation of each oil passage, as long as it satisfies the aforementioned connectivity, can be adjusted according to the actual size, shape, and space requirements of the front cover.

[0065] Example 3

[0066] The technical features that distinguish Example 3 from Example 1 and Example 2 are as follows:

[0067] like Figure 4 The inner wall of the filler hole 4 has threads of the same specifications as the lifting hole of the front cover. During assembly, the filler hole 4 can also be used as a lifting hole, eliminating the need for a separate lifting hole design for the traditional front cover. Integrating the lifting hole and the filler hole 4 into a single design reduces the complexity of casting and machining, and improves utilization.

[0068] Example 4

[0069] The difference between Example 4 and Example 2 is as follows:

[0070] The main hydraulic pressure passage 23, the forward gear clutch pressure passage 24, the second gear clutch pressure passage 28, the reverse gear clutch pressure passage 25, the third gear clutch pressure passage 27, and the first gear clutch pressure passage 26 are designed with different passage depths according to their respective wall thicknesses and are cast separately. The casting of each passage is unaffected by the other passages, ensuring its maximum depth and increasing the flow area of ​​each passage. This reduces pressure loss during oil flow and improves the overall efficiency of the hydraulic system. For example, Figure 7 The oil passages at points A and B have different depths. Point A is the main oil pressure passage 23 corresponding to the main oil pressure hole 14, while point B is the oil passage on the valve body mating surface 32 corresponding to the first unloading hole 13.

[0071] In addition to the above embodiments one to four, the present invention has other preferred embodiments, including but not limited to combinations of the above embodiments and the separation of preferred parts in each embodiment.

[0072] Furthermore, based on the aforementioned transmission front cover, this invention also proposes a transmission whose front cover adopts the transmission front cover of this invention, possessing all the advantages of the transmission front cover of this invention. Correspondingly, the transmission also has at least the embodiments of Embodiments 1 to 4 described above. By improving the sealing performance of the assembly and reducing the pressure loss of the oil circuit, the efficiency of the transmission assembly is improved in practical applications.

[0073] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A transmission front cover, comprising a front cover body (1) and a valve body (2); The front cover body (1) is provided with a first vent hole (5a) and a filler hole (4). A groove is provided on the front surface of the front cover body (1). A connecting cavity (33) is formed between the groove and the shell. The part of the front surface of the front cover body (1) located outside the groove forms a shell connecting surface (3). The bottom of the groove is defined as the cavity end face. A second vent hole (5b), an input shaft hole (9), a forward gear output shaft hole and a reverse gear output shaft hole are provided on the cavity end face. The valve body (2) and the front cover body (1) are provided with a main oil pressure passage (23), a forward gear clutch pressure passage (24), a reverse gear clutch pressure passage (25), a first gear clutch pressure passage (26) and n gear clutch pressure passages; n is an integer greater than or equal to 0; Its features are: It also includes a first oil baffle structure (5c) and a second oil baffle structure (5d) located around the second vent plug (5b); The front cover body (1) and the valve body (2) are an integral structure; the front cover body (1) is provided with a first unloading oil passage (7) and a second unloading oil passage (8); one end of the first unloading oil passage (7) and the second unloading oil passage (8) are located on the end face of the cavity, and the other end is connected to the first unloading hole (13) and the second unloading hole (17) respectively; the valve body (2) is provided with a second weight reduction groove (30) on the mating surface (32), and the second weight reduction groove (30) is connected to the second unloading oil passage (8) through the second connecting hole (18); The first oil-blocking structure (5c) and the second oil-blocking structure (5d) are both disposed in the connecting cavity (33) to form a shield for the second vent hole (5b) in the connecting cavity (33) after the front end cover is combined with the transmission housing; a gap is left between the first oil-blocking structure (5c) and the second oil-blocking structure (5d) for the second vent hole (5b) to communicate with the connecting cavity (33); The main hydraulic pressure passage (23), the forward gear clutch pressure passage (24), the reverse gear clutch pressure passage (25), the first gear clutch pressure passage (26), and the n gear clutch pressure passages are all located inside the valve body (2) and are set independently. One end of the main hydraulic pressure passage (23), the forward gear clutch pressure passage (24), the reverse gear clutch pressure passage (25), the first gear clutch pressure passage (26), and the n gear clutch pressure passages are all located on the mating surface (32) of the valve body (2). A first weight reduction groove (29) is provided on the mating surface (32) of the valve body (2), and the first weight reduction groove (29) is connected to the mating cavity (33).

2. The transmission front cover according to claim 1, characterized in that: The center of one end of the first unloading oil passage (7) is located above the side of one end of the input shaft hole (9); and when the transmission is working, the flow range of the oil flowing out from one end of the first unloading oil passage (7) can cover the rotating parts of the transmission inside the input shaft hole (9).

3. A transmission front cover according to claim 1 or 2, characterized in that: The inner wall of the filler hole (4) is provided with threads of the same specifications as the lifting hole of the front cover of the transmission.

4. The transmission front cover according to claim 3, characterized in that: The depths of the main hydraulic oil passage (23), the forward gear clutch pressure oil passage (24), the reverse gear clutch pressure oil passage (25), the first gear clutch pressure oil passage (26), and the n gear clutch pressure oil passages are different.

5. The transmission front cover according to claim 4, characterized in that: The depths of the main hydraulic oil passage (23), the forward gear clutch pressure oil passage (24), the reverse gear clutch pressure oil passage (25), the first gear clutch pressure oil passage (26), and the n gear clutch pressure oil passages are all the maximum depths under mutually independent structures.

6. The transmission front cover according to claim 5, characterized in that: The other end of the forward gear clutch pressure oil passage (24) is connected to the forward gear output shaft hole (10) through the forward gear clutch pressure oil hole (15) in the valve body (2); The other end of the reverse clutch pressure oil passage (25) is connected to the reverse output shaft hole (11) through the reverse clutch pressure oil hole (16) in the valve body (2); The other end of the first gear clutch pressure oil passage (26) is connected to one end of the second gear clutch pressure oil passage (12) through the first gear clutch pressure oil hole (19) in the valve body (2). The other end of the second gear clutch pressure oil passage (12) is located on the housing mating surface (3). The other ends of the n gear clutch pressure oil passages are respectively connected to the forward gear output shaft hole (10) or the reverse gear output shaft hole (11) through the corresponding gear clutch pressure oil hole in the valve body (2).

7. A transmission front cover according to claim 6, characterized in that: A pre-drilled hole (34) is also provided on the end face of the cavity.

8. A transmission, characterized in that: The front cover of the transmission adopts the transmission front cover as described in any one of claims 1 to 7.

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