CN116576247A

CN116576247A - Transmission housing with internal oil circuit and transmission lubrication cooling system thereof

Info

Publication number: CN116576247A
Application number: CN202310683613.9A
Authority: CN
Inventors: 李振国; 刘娟; 韩旭; 宫一鸣; 吴玉亮
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2023-06-09
Filing date: 2023-06-09
Publication date: 2023-08-11

Abstract

The utility model relates to a transmission shell with an inner oil way and a transmission lubrication cooling system thereof, wherein the transmission shell with the inner oil way comprises a shell body and an inner oil way, the inner oil way is formed in the shell body, the inner oil way comprises an oil inlet pipeline, an intermediate pipeline and an oil return pipeline, the shell body is provided with an oil inlet pipeline and an oil return pipeline, lubricating oil to be cooled can flow to the oil inlet pipeline and the intermediate pipeline in sequence through the oil inlet pipeline, the lubricating oil to be cooled in the intermediate pipeline can flow to an outer cooler and be cooled in the outer cooler, and the lubricating oil cooled in the outer cooler can flow out of the oil return pipeline through the oil return pipeline. The lubricating pipeline which is externally arranged and connected with the shell body is arranged inside the shell body, so that the structure of the transmission assembly is effectively simplified, the available space of other parts in the transmission assembly is increased, the layout of the parts in the transmission assembly is optimized, and the oil leakage risk of parts such as a pipe joint used for connecting the external lubricating pipeline with the shell body is effectively avoided by the internal oil circuit.

Description

Transmission housing with internal oil circuit and transmission lubrication cooling system thereof

Technical Field

The utility model relates to the technical field of automobile transmissions, in particular to a transmission shell with an inner oil way and a transmission lubricating and cooling system thereof.

Background

At present, the transmission of a heavy commercial vehicle has large bearing capacity, the speed changer easily enters an overload and overpressure working condition when the heavy commercial vehicle runs in high-temperature areas such as deserts and hills, the temperature of lubricating oil of the transmission is rapidly increased, and at the moment, the transmission is required to be cooled and depressurized in time so as to avoid failure of parts such as an oil seal, a filter element, a synchronizer and the like caused by overhigh temperature of the transmission, so that a lubricating oil cooling system is usually arranged for the transmission.

The specification of Chinese patent No. 106594253A discloses a cooling and lubricating system and a cooling and lubricating method for a heavy-duty transmission, wherein the cooling and lubricating system establishes a linkage relationship by taking a temperature control valve as a control part among an oil inlet pipe of the temperature control valve, an oil outlet pipe of the temperature control valve, the cooling oil inlet pipe, an oil injection pipe and an oil drain bolt, and adopts the combination of an external radiator and forced lubrication of an oil pump to ensure the lubricating and cooling requirements of shaft teeth, bearings, sealing elements, lubricating oil and the like under special complex working conditions.

The specification of Chinese patent No. 206668929U discloses a cooling and lubricating system for a speed changer, wherein the cooling and lubricating system is provided with two paths of oil pump total components, one path of oil pump total components is connected to a speed changer shell through a back pressure valve, the other path of oil pump total components is connected to the speed changer shell through an external pipeline of a cooling system, and a radiator is arranged on the external pipeline of the cooling system. By providing a back pressure valve on the transmission housing, the back pressure valve can be opened to allow oil to directly flow into the lubrication oil passage when the cooling system is blocked.

The cooling and lubricating system takes the oil way arranged outside the transmission shell as a cooling path, the matching part of the transmission shell is matched and connected in a pipe joint mode, the matching parts are more and the structure is complex, the arrangement of moving parts inside the transmission is not facilitated, and oil leakage faults are easily caused at the oil way joint.

Disclosure of Invention

Accordingly, it is necessary to provide a transmission case having an internal oil passage and a transmission lubrication and cooling system thereof, which solve the problems of the complicated structure and the easiness of oil leakage of the transmission cooling and lubrication system.

The transmission shell with the inner oil way is applied to a transmission lubrication cooling system and comprises a shell body and the inner oil way, wherein the inner oil way is formed inside the shell body, and the inner oil way comprises an oil inlet pipeline, an intermediate pipeline and an oil return pipeline; wherein, the liquid crystal display device comprises a liquid crystal display device,

the shell body is provided with an oil inlet channel and an oil return channel, the oil inlet channel is used for introducing lubricating oil to be cooled, and the oil return channel is used for flowing out the cooled lubricating oil;

the oil inlet pipeline is communicated with the oil inlet duct and the middle pipeline, so that the lubricating oil to be cooled can flow to the oil inlet pipeline and the middle pipeline in sequence through the oil inlet duct;

the intermediate pipeline is used for communicating with an outer cooler of the transmission lubrication cooling system, so that the lubricating oil to be cooled in the intermediate pipeline can flow to the outer cooler and be cooled in the outer cooler;

the oil return pipeline is communicated with the oil return pore canal and the outer cooler, so that the cooled lubricating oil in the outer cooler can flow out of the oil return pore canal through the oil return pipeline.

In one embodiment, the transmission housing with the internal oil path further includes a filtering cavity, and the filtering cavity is communicated with the oil inlet channel and the oil inlet pipeline in the middle, so that the lubricating oil to be cooled can flow to the filtering cavity and the oil inlet pipeline in sequence through the oil inlet channel, and the filtering cavity is used for installing a filtering device of the transmission lubrication cooling system, so that the filtering device can filter the lubricating oil.

In one embodiment, a pressure relief duct is formed in a lubricating oil path of the intermediate line and the oil return line, the pressure relief duct being configured to accommodate a pressure relief valve of the transmission lubrication cooling system, the pressure relief valve being configured to block the pressure relief duct so as to not communicate between the intermediate line and the oil return line when the pressure is subjected to be less than a preset pressure, and to open the pressure relief duct when the pressure is subjected to reach the preset pressure.

In one embodiment, the pressure relief duct is a stepped duct, a first pressure relief duct and a second pressure relief duct are sequentially formed along the direction that the intermediate duct leads to the oil return duct, the aperture of the first pressure relief duct is smaller than that of the second pressure relief duct, and the oil return duct and the intermediate duct are both communicated with the first pressure relief duct; the first pressure relief pore canal is used for accommodating the pilot valve of the pressure relief valve, the second pressure relief pore canal is used for installing the main valve of the pressure relief valve, so that the pilot valve can block the first pressure relief pore canal to prevent communication between the middle pipeline and the oil return pipeline when the borne pressure is smaller than the preset pressure, and can open the first pressure relief pore canal when the borne pressure reaches the preset pressure, and the middle pipeline is communicated with the oil return pipeline.

In one embodiment, a mounting end surface for mounting the outer cooler is formed on the shell body, a first hole communicated with the intermediate pipeline and a second hole communicated with the oil return pipeline are formed on the mounting end surface, the intermediate pipeline is communicated with the outer cooler through the first hole, and the oil return pipeline is communicated with the outer cooler through the second hole.

In one embodiment, the bore end surface of the first bore and the bore end surface of the second bore are both recessed from the mounting end surface.

In one embodiment, grooves are formed at the edges of the mounting end face and the edges of the mounting end face, in which the first holes and the second holes are formed, the grooves are used for placing sealing gaskets of the transmission lubrication and cooling system, the shapes of the sealing gaskets are matched with those of the grooves, and the sealing gaskets play a role in sealing and leakage prevention when the external cooler is mounted on the mounting end face.

In one embodiment, the hole end surface of the oil inlet hole close to one side of the inner part of the shell body is provided with a chamfer.

The utility model also provides a transmission lubrication cooling system, which comprises the transmission shell with the inner oil way, the outer cooler and the pressure relief valve, wherein the middle pipeline and the oil return pipeline are respectively communicated with the outer cooler, and the pressure relief valve is arranged at the communication position of the middle pipeline and the oil return pipeline.

In one embodiment, the transmission lubrication cooling system further comprises a filter device disposed between the oil feed passage and the oil feed line.

According to the technical scheme, lubricating oil to be cooled flows to the oil inlet pipeline, the intermediate pipeline and the outer cooler in sequence through the oil inlet pipeline, and flows out of the oil return pipeline from the oil return pipeline after being cooled in the outer cooler, so that cooling circulation of the lubricating oil in the transmission is realized. The lubricating pipeline which is arranged outside the shell body and connected with the shell body in the transmission cooling and lubricating system is arranged inside the shell body, so that the structure of the transmission assembly is effectively simplified, the available space of other parts in the transmission assembly is increased, the layout of the parts in the transmission assembly is optimized, and the lubricating oil pipeline is arranged inside the shell body, so that the oil leakage risk of parts such as a pipe joint used for connecting between the external lubricating pipeline and the shell body in the operation process of the transmission is effectively avoided.

Drawings

Fig. 1 is a schematic diagram of a transmission housing with an internal oil passage and a transmission lubrication cooling system according to the present utility model.

Fig. 2 is a cross-sectional view of a transmission housing having an internal oil passage and a relief valve mounting structure for a transmission lubrication cooling system of the present utility model.

Fig. 3 is a cross-sectional view taken along A-A of fig. 2.

Fig. 4 is a B-B cross-sectional view of fig. 2.

Fig. 5 is a sectional view showing a filter device mounting structure of a transmission case having an internal oil passage and a transmission lubrication cooling system according to the present utility model.

Fig. 6 is a schematic exploded view of a transmission housing with an internal oil passage and a transmission lubrication cooling system according to the present utility model.

Fig. 7 is a schematic diagram of the external cooler structure of the transmission housing with the internal oil passage and its transmission lubrication cooling system in the present utility model.

Component reference numerals in the drawings illustrate:

1000. a transmission housing having an internal oil passage; 100. a housing body; 200. an inner oil path; 300. a filtration cavity; 400. a filtering device; 500. a pressure release valve; 600. an external cooler; 700. a mounting end face; 800. a sealing gasket; 2000. a transmission lubrication cooling system; 110. an oil inlet channel; 120. an oil return duct; 130. a pressure relief duct; 210. an oil supply pipeline; 220. an intermediate pipeline; 230. an oil return pipeline; 410. a filter device chamber cover; 510. a main valve; 520. a pilot valve; 710. a first hole; 720. a second hole; 730. a groove; 131. a first pressure relief port; 132. the second pressure relief duct; 211. a blocking member.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1 and 5, the present utility model proposes a transmission housing 1000 with an internal oil path, which is applied to a transmission lubrication cooling system 2000, and the transmission housing 1000 with an internal oil path includes a housing body 100 and an internal oil path 200. The inner oil passage 200 is formed inside the case body 100, and the inner oil passage 200 includes an oil supply pipe 210, an intermediate pipe 220, and an oil return pipe 230. The shell body 100 is provided with an oil inlet channel 110 and an oil return channel 120, the oil inlet channel 110 is used for introducing lubricating oil to be cooled, and the oil return channel 120 is used for flowing out the cooled lubricating oil. The oil supply line 210 communicates with the oil supply line 110 and the intermediate line 220 so that the lubricating oil to be cooled can flow to the oil supply line 210 and the intermediate line 220 through the oil supply line 110 in sequence. The intermediate line 220 is used to communicate with the outer cooler 600 of the transmission lubrication cooling system 2000 so that the lubrication oil to be cooled in the intermediate line 220 can flow to the outer cooler 600 and be cooled in the outer cooler 600. The oil return line 230 communicates with the oil return port 120 and the outer cooler 600 such that the lubricating oil cooled in the outer cooler 600 can flow out of the oil return port 120 through the oil return line 230.

The transmission housing 1000 having the internal oil passage may be formed by machining, casting, or the like, and is not particularly limited herein. Preferably, the interior of the transmission case 1000 having the internal oil passage and the duct communicating with the interior are formed by machining, that is, the internal oil passage 200 communicating with each other is manufactured by drilling the case body 100. The mechanical drilling mode can not only process high-quality pipelines, but also omit parts such as pipe joints and the like required by connection between the inner pipelines of the shell body 100, thereby being beneficial to simplifying the transmission lubrication cooling system 2000.

The shape and specific arrangement position of the oil feed line 210, the intermediate line 220 and the oil return line 230 inside the case body 100 are determined according to actual design. The shapes of the oil feed line 210, the intermediate line 220, and the oil return line 230 may be other shapes such as straight or right angle, and are not particularly limited herein. The oil supply pipe 210, the intermediate pipe 220, the oil return pipe 230 and other inner pipes may be directly connected at the pipe ends, or may be connected to the pipes through channels, which is not particularly limited herein. For example, referring to fig. 2 to 4, the incoming oil pipe 210 is perpendicular to the intermediate pipe 220, the incoming oil pipe 210 and the intermediate pipe 220 are connected at the pipe ends, in order to prevent the backflow of the lubricating oil after entering the incoming oil pipe 210, the end of the incoming oil pipe 210 away from the intermediate pipe 220 is provided with a closed end, the end of the incoming oil pipe 210 away from the intermediate pipe 220 is usually provided with a pipe end opening due to the machining mode of mechanical drilling, and the pipe end opening is provided with a blocking member 211 to close the pipe end opening of the incoming oil pipe 210. The oil return pipeline 230 is arranged below the oil supply pipeline 210 and the middle pipeline 220 in parallel, and the oil return pipeline 230 and the middle pipeline 220 are communicated through pore canals.

With this arrangement, the lubricating oil to be cooled flows through the oil supply passage 110 to the oil line 210, the intermediate line 220, and the outer cooler 600 in this order, and after being cooled in the outer cooler 600, flows out of the oil return passage 120 from the oil return line 230, thereby realizing the cooling cycle of the lubricating oil in the transmission. The lubricating pipeline that should arrange in shell body 100 outside and be connected with shell body 100 among the transmission cooling lubrication system sets up in shell body 100 inside, has not only effectively simplified the derailleur assembly structure, has improved the usable space of other parts in the derailleur assembly, has optimized the part overall arrangement in the derailleur assembly, and lubricating oil way sets up in shell body 100 inside effectively avoided the oil leak risk of parts such as pipe joint used in being connected between external lubricating pipeline and shell body 100 in the derailleur operation in-process.

Referring to fig. 3 to 5, the transmission case 1000 having the internal oil path further includes a filter cavity 300, and the filter cavity 300 communicates with the oil inlet channel 110 and the oil inlet channel 210 therebetween, so that the lubricating oil to be cooled can flow to the filter cavity 300 and the oil inlet channel 210 in sequence through the oil inlet channel 110, and the filter cavity 300 is used for installing the filter device 400 of the transmission lubrication cooling system 2000, so that the filter device 400 can filter the lubricating oil. The filter volume 300 communicates with the incoming oil line 210 through a port.

Referring to fig. 2 to 4, a relief port 130 communicating the intermediate line 220 and the return line 230 is formed in a lubricating oil path of the intermediate line 220 and the return line 230, the relief port 130 is used to accommodate a relief valve 500 of the transmission lubrication cooling system 2000, the relief valve 500 is configured to block the relief port 130 when the received pressure is less than a preset pressure so as to prevent communication between the intermediate line 220 and the return line 230, and to open the relief port 130 when the received pressure reaches the preset pressure. So configured, when the pressure bearable by the pressure relief valve 500 is below the preset pressure, the transmission is in a normal pressure condition, and at this time, the lubricating oil enters the outer cooler 600 through the intermediate pipeline 220 for cooling, and flows into the oil return pipeline 230 after cooling. When the bearable pressure of the pressure release valve 500 exceeds the preset pressure, the transformer is in an overpressure working condition, and at the moment, part of lubricating oil in the intermediate pipeline 220 directly enters the oil return pipeline 230 through the pressure release hole 130 and is discharged out of the shell body 100 under the pressure action, so that the pressure release protection effect on the transmission is achieved.

Illustratively, the pressure relief duct 130 is a stepped duct, a first pressure relief duct 131 and a second pressure relief duct 132 are sequentially formed along the direction that the intermediate duct 220 leads to the oil return duct 230, the aperture of the first pressure relief duct 131 is smaller than that of the second pressure relief duct 132, and the oil return duct 230 and the intermediate duct 220 are both communicated with the first pressure relief duct 131. The first pressure relief port channel 131 is used for accommodating the pilot valve 520 of the pressure relief valve 500, the second pressure relief port channel 132 is used for installing the main valve 510 of the pressure relief valve 500, so that the pilot valve 520 can block the first pressure relief port channel 131 to prevent communication between the intermediate pipeline 220 and the oil return pipeline 230 when the borne pressure is smaller than the preset pressure, and the pilot valve 520 can open the first pressure relief port channel 131 when the borne pressure reaches the preset pressure, so that communication between the intermediate pipeline 220 and the oil return pipeline 230 is realized.

Illustratively, referring to FIG. 2, the pressure relief valve 500 is a spring-type pressure relief valve 500 with a pilot valve 520 having a buffer. The first pressure relief channel 131 guides the cushioning member. When the pressure bearable by the pressure release valve 500 is below the preset pressure, the buffer member is in a state of releasing the reset energy, the length of the pilot valve 520 is lengthened and the communication position between the first pressure release pore channel 131 and the oil return pipeline 230 is blocked, when the pressure bearable by the pressure release valve 500 exceeds the preset pressure, the buffer member is in a state of storing the reset energy, and the length of the pilot valve 520 is shortened and the communication position between the first pressure release pore channel 131 and the oil return pipeline 230 is opened. The buffer is illustratively a compression spring.

Referring to fig. 6 and 7, a mounting end surface 700 for mounting the outer cooler 600 is formed on the case body 100, a first hole 710 communicating with the intermediate pipe 220 and a second hole 720 communicating with the oil return pipe 230 are formed on the mounting end surface 700, the intermediate pipe 220 communicates with the outer cooler 600 through the first hole 710, and the oil return pipe 230 communicates with the outer cooler 600 through the second hole 720. The mounting end surface 700 may be a planar end surface, and the mounting end surface 700 may be a hollowed-out end surface, which is not particularly limited herein. Illustratively, the mounting end surface 700 is generally configured as a hollowed-out end surface due to the reinforcing ribs provided on the outer surface of the shell body 100, which contributes to the weight reduction of the shell body 100. The connection between the mounting end surface 700 and the external cooler 600 may be non-detachable connection such as welding, or the connection between the mounting end surface 700 and the external cooler 600 may be detachable connection such as bolting, and is not particularly limited herein. By connecting the mounting end face 700 with the external cooler 600, parts such as pipelines and pipe joints required for connecting the housing body 100 with the external cooler 600 are omitted, and the number of parts and the mounting structure of the transmission lubrication cooling system 2000 are further simplified.

Grooves 730 are formed at the edges of the mounting end face 700 and the edges of the mounting end face 700 where the first holes 710 and the second holes 720 are formed, the grooves 730 are used for placing sealing gaskets 800 of the transmission lubricating and cooling system 2000, the shapes of the sealing gaskets 800 are matched with those of the grooves 730, and the sealing gaskets 800 play a role in sealing and leakage prevention when the external cooler 600 is mounted on the mounting end face 700. Preferably, the sealing gasket 800 is configured as a multi-format sealing gasket 800, so that the sealing gasket 800 is uniformly stressed when being installed in the groove 730 in a pressing manner, and the deformation degree of the sealing gasket 800 is effectively reduced.

Preferably, the bore end surface of the first bore 710 and the bore end surface of the second bore 720 are both recessed from the mounting end surface 700. The hole end surfaces of the first hole 710 and the second hole 720, which are generally machined, have burrs, so that the first hole 710 end surface and the second hole 720 end surface can be prevented from affecting the flatness of the mounting end surface 700, thereby affecting the sealability between the mounting end surface 700 and the external cooler 600.

Preferably, the hole end surface of the oil coming channel 110 near the inner side of the case body 100 is provided with a chamfer such that the opening of the oil coming channel 110 communicating with the inner side of the case body 100 is increased to increase the oil intake amount.

Referring to fig. 1, 2, 5 and 6, the present utility model further provides a transmission lubrication cooling system 2000, which includes the above-mentioned transmission housing 1000 with an inner oil path, an outer cooler 600 and a pressure relief valve 500, wherein the middle pipeline 220 and the oil return pipeline 230 are respectively connected to the outer cooler 600, and the pressure relief valve 500 is disposed at a connection position between the middle pipeline 220 and the oil return pipeline 230. The relief valve 500 may be a spring type relief valve, a lever type relief valve, a pulse type relief valve, or other relief valves, which are not particularly limited herein. The relief valve 500 can prevent damage to or oil leakage from the transmission lubrication cooling system 2000 due to excessive oil pressure. The cooling method of the external cooler 600 may be an air-cooled cooling method, a water-cooled cooling method, or the like, and is not particularly limited herein.

The transmission lubrication cooling system 2000 further includes the filtering device 400, where the filtering device 400 is disposed between the incoming oil duct 110 and the incoming oil duct 210, and the filtering device 400 further includes a filtering device cavity cover 410. The filter device 400 may be other filters such as a mesh filter, a sheet filter, a wire gap filter, and a magnet filter, and is not particularly limited herein. The filtering device 400 can filter impurities such as oil sludge and scraps possibly generated in the lubricating oil, and effectively protects parts in the transmission assembly, which are easily damaged by the impurities.

The transmission lubrication cooling system 2000 further includes the above-described gasket 800, and the gasket 800 is disposed between the mounting end surface 700 and the external cooler 600. The gasket 800 may be a rubber gasket, a silica gel gasket, or the like, and is not particularly limited herein.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. The transmission shell with the inner oil way is applied to a transmission lubrication cooling system and is characterized by comprising a shell body and an inner oil way, wherein the inner oil way is formed inside the shell body and comprises an oil inlet pipeline, an intermediate pipeline and an oil return pipeline; wherein, the liquid crystal display device comprises a liquid crystal display device,

2. The transmission housing with an internal oil passage according to claim 1, further comprising a filter housing that communicates the oil supply passage and the oil supply passage therebetween so that the lubricating oil to be cooled can flow to the filter housing and the oil supply passage in order through the oil supply passage, the filter housing being used for mounting a filter device of the transmission lubrication cooling system so that the filter device can filter the lubricating oil.

3. The transmission housing with an internal oil passage according to claim 1, wherein a relief port that communicates the intermediate pipe and the oil return pipe is formed in a lubricating oil path of the intermediate pipe and the oil return pipe, the relief port being for accommodating a relief valve of the transmission lubrication cooling system, the relief valve being configured to block the relief port so as not to communicate between the intermediate pipe and the oil return pipe when a pressure to be subjected is less than a preset pressure, and to open the relief port when the pressure to be subjected reaches the preset pressure.

4. The transmission housing with an internal oil passage according to claim 3, wherein the pressure release duct is a stepped duct, a first pressure release duct and a second pressure release duct are sequentially formed along a direction in which the intermediate duct opens into the oil return duct, a pore diameter of the first pressure release duct is smaller than a pore diameter of the second pressure release duct, and the oil return duct and the intermediate duct are both communicated with the first pressure release duct; the first pressure relief pore canal is used for accommodating the pilot valve of the pressure relief valve, the second pressure relief pore canal is used for installing the main valve of the pressure relief valve, so that the pilot valve can block the first pressure relief pore canal to prevent communication between the middle pipeline and the oil return pipeline when the borne pressure is smaller than the preset pressure, and can open the first pressure relief pore canal when the borne pressure reaches the preset pressure, and the middle pipeline is communicated with the oil return pipeline.

5. The transmission case with an internal oil passage according to claim 1, characterized in that a mounting end surface for mounting an external cooler is formed on the case body, a first hole communicating with the intermediate pipe and a second hole communicating with the oil return pipe are formed on the mounting end surface, the intermediate pipe communicates with the external cooler through the first hole, and the oil return pipe communicates with the external cooler through the second hole.

6. The transmission housing having an internal oil passageway according to claim 5, wherein the bore end surface of the first bore and the bore end surface of the second bore are both recessed from the mounting end surface.

7. The transmission housing with an internal oil passage according to claim 5, wherein grooves are formed at both edges of said mounting end face and edges of said mounting end face where said first hole and said second hole are formed, said grooves being for placing gaskets of said transmission lubrication cooling system, said gaskets being shaped to match said groove shape, said gaskets functioning as a seal leakage-proof when said external cooler is mounted to said mounting end face.

8. The transmission case with an internal oil passage according to claim 1, wherein a hole end face of the oil supply hole near a side inside the case body is provided with a chamfer.

9. A transmission lubrication cooling system, comprising:

a transmission housing having an internal oil passage as claimed in any one of claims 1 to 8;

the intermediate pipeline and the oil return pipeline are respectively communicated with the outer cooler;

the pressure relief valve is arranged at the communication position of the intermediate pipeline and the oil return pipeline.

10. The transmission lubrication and cooling system according to claim 9, further comprising a filter device disposed between the oil inlet duct and the oil inlet line.