Optimization method for heat exchange efficiency of engine oil cooler of automobile transmission

Abstract

The invention provides a method for optimizing the heat exchange efficiency of an engine oil cooler of an automobile transmission, belongs to the technical field of engine oil coolers, and finds out a key part for improving the heat exchange efficiency of the cooler, namely a connecting mode of a cooling pipe body and a connector. A cooling pipe body and a connector structure are optimized, so that the cooling pipe body and the connector structure meet a movable connection mode, and the problem existing in the connection mode, namely the sealing problem of movable connection, is found out; through design of structural features and material features of a sealing structure, the sealing problem of movable connection is solved, an initial optimization structure of the engine oil cooler is obtained, a heat exchange efficiency improvement value is calculated, and when the heat exchange efficiency improvement value meets design requirements, a final optimization structure of the engine oil cooler is obtained; according to the structure, the connector and the cooling pipe are designed in a split mode and movably connected, the connector is installed after the cooling pipe is assembled into the water inlet and outlet chamber, the cooling pipe with a larger pipe diameter can be installed under the same width of the water outlet chamber, and the heat exchange efficiency of the engine oil cooler of the automobile gearbox is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil coolers, and in particular to a method for optimizing the heat exchange efficiency of an automobile gearbox oil cooler. Background Art

[0002] The purpose of the automobile transmission oil cooler is to ensure that the temperature of the oil inside the transmission is within a suitable range, thereby improving the working efficiency and service life of the transmission. The transmission cooler is usually a cooling pipe placed in the water outlet chamber of the radiator. The transmission oil flowing through the cooling pipe is cooled by the coolant, which is an integrated oil cooler. Existing cooling pipes such as patent number CN117583495B, name: a tubular oil cooler automatic assembly equipment, the background technology mentioned in the invention states that "as a kind of oil cooler, the tubular oil cooler includes an outer tube, an inner tube, a fin located between the outer tube and the inner tube, and a joint fixed to the tube mouth. When assembling the oil cooler, first bend the fin into a semicircle, and then fold the inner tube into a semicircle. The tube is placed on the semicircular fin, and then the fin is bent again so that the fin is covered on the inner tube, and then the inner tube covered with the fin is placed in the outer tube, and the fin is fixed to the outer tube after the inner tube is expanded, and then welding agent is applied to the joint, and the joint coated with welding agent is inserted between the inner and outer tubes to complete the assembly of the oil cooler. "This tubular oil cooler is a tube body and a joint that are welded as a whole and then installed in the water outlet chamber. Therefore, the diameter of the cooling tube cannot be too large, which leads to low heat exchange efficiency of the gearbox oil cooler. In order to meet the energy-saving needs of the current automobile market, an optimization method is needed to improve the heat exchange efficiency of the gearbox oil cooler under the condition that the volume of the water outlet chamber remains unchanged. Summary of the invention

[0003] The object of the present invention is to provide a method for optimizing the heat exchange efficiency of an automobile transmission oil cooler, so as to solve the problem of low heat exchange efficiency of the transmission oil cooler proposed in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A method for optimizing the heat exchange efficiency of an automobile transmission oil cooler comprises the following steps:

[0006] S100, obtaining structural characteristics of the original oil cooler;

[0007] S200, analyzing the characteristics of the original oil cooler;

[0008] S300, extracting the structural features of the original joint of the original oil cooler and obtaining an initial joint structure optimization strategy;

[0009] S400, determining an optimization strategy for the initial sealing feature corresponding to the optimized initial joint structure;

[0010] S500, decomposing and optimizing the original oil cooler structure according to the obtained characteristic optimization strategy of the initial joint and the initial seal, to obtain an optimized structure of the initial oil cooler;

[0011] S600, calculating the heat exchange efficiency improvement value of the initial oil cooler optimized structure according to the initial oil cooler optimized structure, and obtaining the final oil cooler optimized structure when the heat exchange efficiency improvement value meets the design requirements.

[0012] Furthermore, the initial joint structure optimization strategy in step S300 includes basic optimization principles and optimization design of the initial joint structure, wherein the basic optimization principles include: a split design principle and a movable connection principle; the split design principle is that the initial joint structure and the initial cooling pipe in the initial oil cooler are designed separately; the movable connection principle is that the initial joint is movably connected to the initial cooling pipe; the initial joint structure optimization design is that the initial joint is installed after the initial cooling pipe is assembled, and the initial joint is detachable.

[0013] Furthermore, the characteristic optimization strategy of the initial seal corresponding to the initial joint in step S400 includes the structural characteristics and material characteristics of the initial seal; the structural characteristic of the initial seal is that a first sealing structure sealed with the water outlet chamber is arranged on the initial cooling pipe, and the first sealing structure is a first sealing ring; a second sealing structure sealed with the initial cooling pipe is arranged on the initial joint, and the initial joint is divided into an initial oil inlet joint and an initial oil outlet joint, a second sealing ring is arranged on the initial oil inlet joint, and a third sealing ring is arranged on the initial oil outlet joint; the material characteristics of the initial seal are: the first sealing ring and the third sealing ring are made of ordinary elastic material; the second sealing ring is made of elastic material that does not fail at a working temperature of 80 to 120°C and a maximum temperature of 300°C.

[0014] Further, the optimized structure of the initial oil cooler in step S500 is: the initial oil cooler comprises an initial cooling pipe and an initial joint, and the initial joint is movably connected to the initial cooling pipe;

[0015] The initial cooling pipe comprises a pipe body, which comprises an outer pipe, an inner pipe and an oil pipe between the outer pipe and the inner pipe. A base is respectively provided at both ends of the pipe body, and one end of the base is cylindrical and has a wedge-shaped portion, and the wedge-shaped portion is clamped on the inner wall of the pipe body; the other end of the base is open and communicates with the water outlet chamber; a connecting portion is provided on the upper part of the base, and the connecting portion is circular and has a first groove on the outer ring, a boss on the inner ring, a connecting hole in the boss, a connecting surface on the top of the connecting hole, and an internal thread under the connecting surface;

[0016] The initial joint comprises a joint body, a through hole is provided in the joint body, a flange is provided on the outside, the upper part of the flange is connected to the oil pipeline, the lower part of the flange is provided with a second groove, and the lower part of the second groove is provided with an external thread;

[0017] The oil pipeline is divided into an oil inlet and an oil outlet. The initial joint connected to the oil inlet is the oil inlet joint; the initial joint connected to the oil outlet is the oil outlet joint; the bases at both ends of the tube body are threadedly connected to the oil inlet joint and the oil outlet joint respectively.

[0018] Preferably, the connecting surface is a bevel connecting surface, and the bevel connecting surface is formed by expanding obliquely toward the outer circle at the top of the connecting hole.

[0019] Preferably, the connecting surface is a curved connecting surface, and the curved connecting surface is formed by tilting and expanding in a curved manner at the top of the connecting hole.

[0020] Furthermore, the curved connecting surface is an S-shaped curved connecting surface.

[0021] Preferably, a first sealing ring is provided in the first groove, and the first sealing ring is used for sealing the tube body and the water outlet chamber.

[0022] Preferably, a second sealing ring is provided in the second groove of the oil inlet joint, and the second sealing ring is used for sealing the tube body and the oil inlet joint.

[0023] Preferably, a third sealing ring is provided in the second groove of the oil outlet joint, and the third sealing ring is used for sealing the tube body and the oil outlet joint.

[0024] In summary, the beneficial effects of the present invention are:

[0025] First, the structural characteristics of the integrated oil cooler such as the original oil cooler are analyzed to find a key part for improving the heat exchange efficiency of the cooler, that is, the connection method of the cooling pipe body and the joint; the integrated joint cooling pipe structure of the original oil cooler is to directly weld the original joint to the original cooling pipe and fix it with the original oil pipe of the original cooling pipe. In order to improve the heat exchange efficiency, it is necessary to increase the contact area between the original cooling pipe and the cooling water in the water outlet chamber. The diameter of the original cooling pipe is increased, and the surface area of ​​its inner and outer pipes is also increased, that is, the contact area between the original cooling pipe and the cooling water is also increased. However, such a design will cause the integrated cooling pipe to be unable to be installed in the water outlet chamber. If the size of the water outlet chamber is increased instead, it will cause it to be unable to be installed in the design space reserved for the automobile gearbox.

[0026] Therefore, under the condition that the size of the water outlet chamber remains unchanged, the original cooling pipe body and joint structure are optimized, including the initial joint structure and the initial cooling pipe being designed separately. During assembly, the initial cooling pipe can be installed in the water outlet chamber as long as the initial outer pipe diameter is smaller than the width of the water outlet chamber; the initial joint is movably connected to the initial cooling pipe; the initial joint is installed after the initial cooling pipe is assembled, so that the size of the water outlet chamber remains unchanged, the inner pipe and the outer pipe of the initial cooling pipe are enlarged, that is, the contact area between the initial cooling pipe and the cooling water in the water outlet chamber is enlarged, and the heat exchange efficiency can be improved;

[0027] Secondly, since the initial joint and the initial cooling pipe are connected in a split and movable manner, this connection method has a sealing problem; therefore, the sealing structure of the initial joint and the initial cooling pipe needs to be designed;

[0028] The structural features of the sealing structure are designed as follows: a first sealing ring is provided on the initial cooling pipe to seal with the water outlet chamber; a second sealing ring is provided on the initial oil inlet joint, a third sealing ring is provided on the initial oil outlet joint, and the connection surface of the initial joint and the base connection portion is set as an inclined connection surface or a curved connection surface. The design of the inclined surface or the curved surface makes the contact area of ​​the seal larger than that of the straight surface, thereby improving the stability of the connection surface and reducing the risk of leakage caused by pressure fluctuations;

[0029] The material characteristics of the sealing structure are designed as follows: ordinary elastic materials are used for the first sealing ring and the third sealing ring with lower ambient temperature; for the second sealing ring with higher ambient temperature, in order to ensure that the sealing material does not fail at high temperature, an elastic material with an operating temperature of 80-120°C and a maximum temperature of 300°C is used without failure. Finally, the optimized structure of the initial automobile transmission oil cooler is obtained.

[0030] Finally, after calculating that the heat exchange efficiency improvement value of the initial oil cooler optimization structure meets the design requirements, the final oil cooler optimization structure is obtained. The final joint and the final cooling pipe are designed separately and flexibly connected. The final joint is installed after the final cooling pipe is assembled into the water outlet chamber. Under the same water outlet chamber width, a final cooling pipe with a larger diameter can be installed to improve the heat exchange efficiency of the automobile gearbox oil cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flow chart of a method for optimizing the heat exchange efficiency of an automobile transmission oil cooler of the present invention;

[0032] Figure 2 is a vertical cross-sectional view of the oil cooler and the water outlet chamber of the present invention;

[0033] Figure 3 is a vertical cross-sectional view of the oil cooler and the water outlet chamber of the present invention;

[0034] Figure 4It is a three-dimensional schematic diagram of the base structure of the oil cooler of the present invention;

[0035] Figure 5 is a cross-sectional elevation view of a base having an inclined connecting surface according to an embodiment of the present invention;

[0036] Figure 6 is a cross-sectional elevation view of a base of a curved connection surface according to an embodiment of the present invention;

[0037] Figure 7 is a vertical cross-sectional view of the assembly of the joint and the base of the present invention;

[0038] Figure 8 It is a partial cross-sectional view of the pipe body and base elevation of the cooling pipe of the present invention;

[0039] Reference numerals in the figure: 100 - cooling tube, 110 - tube body, 111 - inner tube, 112 - oil tube, 113 - outer tube, 120 - base, 121 - connecting part, 1210 - first groove, 12101 - first sealing ring, 1211 - connecting hole, 1212 - connecting surface, 12121 - curved connecting surface, 12122 - inclined connecting surface, 122 - wedge-shaped part, 130 - water channel, 200 - water outlet chamber, 300 - joint, 310 - oil inlet joint, 320 - oil outlet joint, 330 - joint body, 331 - second groove, 3311 - second sealing ring, 3312 - third sealing ring. DETAILED DESCRIPTION

[0040] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given here are only used to illustrate and explain the present invention and cannot be used to limit the present invention. It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention, but the present invention may also have other embodiments and variations thereof, and therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0041] like Figures 1 to 6 As shown, the present invention provides a method for optimizing the heat exchange efficiency of an automobile transmission oil cooler, comprising the following steps: A method for optimizing the heat exchange efficiency of an automobile transmission oil cooler, comprising the following steps:

[0042] A method for optimizing the heat exchange efficiency of an automobile transmission oil cooler comprises the following steps:

[0043] S100, obtaining structural features of the original oil cooler: the original oil cooler structure mainly includes: flow channel structural features such as the original cooling pipe, the original cooling pipe is divided into an original outer pipe and an original inner pipe, and a crude oil pipe formed between the original outer pipe and the original inner pipe; functional installation structural features such as the original joint, the original joint includes an original oil inlet joint and an original oil outlet joint; external assembly structural features such as the water outlet chamber 200.

[0044] S200, analyzing the structure of the original oil cooler; based on the accumulated manufacturing process experience, evaluating the process applicability of the original oil cooler structure; considering the production process requirements of the initial cooling pipe 100 and the initial joint 300, improving the assembly problems of the initial cooling pipe 100 and the water outlet chamber 200, etc.

[0045] S300, extracting the features of the initial joint 300 of the initial oil cooler structure, and obtaining the structural optimization strategy of the initial joint 300; conducting a structural optimization design study of the initial joint 300, optimizing the connection method and structural layout between the initial joint 300 and the initial cooling pipe 100, and determining the optimal structural solution of the initial joint 300, wherein the structural optimization strategy of the initial joint 300 includes the basic structural optimization principle of the initial joint 300 and the structural optimization design of the initial joint 300, wherein the basic optimization principle includes the split design principle and the active connection principle; the split design principle is that the initial joint 300 structure and the initial cooling pipe 100 are designed separately; the active connection principle is that the initial joint 300 and the initial cooling pipe 100 are movably connected; the structural optimization design of the initial joint 300 is that the initial cooling pipe 100 is assembled before installation, and the initial joint 300 is detachable;

[0046] The integrated joint cooling pipe structure of the original oil cooler is to weld the original joint directly on the original cooling pipe and fix it with the crude oil pipe of the original cooling pipe. It can be seen from the structural form and assembly process characteristics of the integrated joint cooling pipe that in order to improve the heat exchange efficiency, it is necessary to increase the contact area between the original cooling pipe and the cooling water in the water outlet chamber 200. The diameter of the original cooling pipe increases, and the surface area of ​​the inner and outer pipes thereof also increases, that is, the contact area between the original cooling pipe and the cooling water also increases. However, such a design will cause the integrated cooling pipe to be unable to be installed in the water outlet chamber 200. If the size of the water outlet chamber 200 is increased instead, it will cause it to be unable to be installed in the design space reserved for the automobile gearbox.

[0047] Specifically, the one-piece joint cooling pipe is inserted and installed from one side of the water outlet chamber 200. Assuming that the original cooling pipe has an original outer tube diameter of d1, an original joint height of h, and a width of the water outlet chamber 200 of W, the outer tube diameter d1 of the original cooling pipe plus the original joint height h must be less than the width W of the water outlet chamber 200, that is, d1+h<W, before it can be normally inserted and assembled; when the outer tube diameter d1 of the original cooling pipe plus the original joint height h is greater than or equal to the width W of the water outlet chamber 200, that is, d1+h≥W, it cannot be inserted and assembled;

[0048] Therefore, in the case where the size of the water outlet chamber 200 remains unchanged, only increasing the outer tube diameter and the inner tube diameter of the original cooling tube is an optimal solution.

[0049] 1. Basic Optimization Principles

[0050] 1. Split design principle

[0051] It can be seen from the joint structure of the above-mentioned integrated joint cooling pipe that when the outer diameter d1 of the original cooling pipe plus the height h of the original joint is greater than or equal to the width W of the water outlet chamber 200, that is, d1+h≥W, the original cooling pipe cannot be installed in the water outlet chamber 200;

[0052] Assuming that the initial outer tube 113 diameter of the initial cooling tube 100 is: D1, the height of the initial joint 300 is: H, the width of the water outlet chamber 200 is: W, the maximum initial outer tube 113 diameter of the initial cooling tube 100 is: If the initial joint 300 and the initial cooling pipe 100 are designed separately, during assembly, the initial outer pipe diameter D1 only needs to be smaller than the width W of the water outlet chamber 200, that is, D1<W, so that the initial cooling pipe 100 can be installed. After optimization, the maximum initial outer pipe diameter 113 of the initial cooling pipe 100 is It can be the width W of the water outlet chamber 200 plus the height H of the initial joint 300, that is, In order to achieve that the size of the water outlet chamber 200 remains unchanged, the diameter of the initial outer tube 113 of the initial cooling tube 100 is increased.

[0053] 2. Activity connection principle

[0054] Since the initial joint 300 and the initial cooling pipe 100 are designed separately, a connecting component is provided on the initial cooling pipe 100, and the connecting component is movably connected to the initial joint 300, so that the initial joint 300 can be installed conveniently after the initial cooling pipe 100 is assembled into the water outlet chamber 200. The connecting component is a base 120, and the base 120 is respectively provided at both ends of the initial cooling pipe 100. A connecting portion 121 is provided on the upper part of the base 120, and the connecting portion 121 is threadedly connected or plug-in connected to the initial joint 300.

[0055] S400, according to the optimized structure of the initial joint 300, determine the initial sealing feature optimization strategy corresponding thereto; comprehensively consider the process characteristics of the initial joint 300, the working load conditions of each part and the external assembly characteristics, etc., to determine the sealing characteristics of the initial joint 300; the initial sealing characteristics include the structural characteristics and material characteristics of the seal; the structural characteristics of the initial seal are that a first sealing structure is provided on the initial cooling pipe 100 to seal with the water outlet chamber 200, and the first sealing structure is a first sealing ring 12101; in the initial A second sealing structure sealed with the initial cooling pipe 100 is arranged on the initial joint 300, and the initial joint 300 is divided into an oil inlet joint 310 and an oil outlet joint 320, the oil inlet joint 310 is provided with a second sealing ring 3311, and the oil outlet joint 320 is provided with a third sealing ring 3312; the material characteristics of the initial seal are as follows: the first sealing ring 12101 and the third sealing ring 3312 are made of ordinary elastic material; the second sealing ring 3311 is made of elastic material with a working temperature of 80-120°C and a maximum temperature of 300°C without failure.

[0056] like Figure 7 As shown, the optimization of the structural features of the initial seal mainly considers that, since the external part of the connection surface 1212 of the initial cooling pipe 100 and the initial joint 300 is connected to the water outlet chamber 200, in order to ensure that the cooling water in the water outlet chamber 200 does not penetrate into the initial joint 300, a first groove 1210 is provided on the outer circle of the connection portion 121, and a first sealing ring 12101 is provided in the first groove 1210; since the internal part of the connection surface 1212 of the initial cooling pipe 100 and the initial joint 300 is connected to the oil inlet joint 310 and the oil outlet joint 320, in order to ensure that the engine oil in the oil inlet joint 310 and the oil outlet joint 320 does not penetrate into the water outlet chamber 200, a boss is provided on the inner circle of the connection portion 121, a connecting hole 1211 is provided in the boss, and a circle of connecting surface 1212 is provided on the top of the connecting hole 1211;

[0057] Conventional connection surfaces 1212 are mostly plane connection surfaces. Since the structure of the plane connection surface is simple, the contact area of ​​the sealing surface is small and the sealing performance is relatively poor, especially in the high temperature environment of the oil inlet joint 310. Therefore, it is considered to design the connection surface 1212 as a non-planar connection surface, such as an inclined surface connection surface 12122. The design of the inclined surface makes the contact area of ​​the seal larger than that of the straight surface, which can ensure that the seal fits more closely on the sealed surface when under pressure to form a more secure seal; for example, the curved surface connection surface 12121, the curved surface design can also provide a larger contact area, and when subjected to axial pressure, it can distribute the pressure more evenly, improve the stability of the sealing surface, and reduce the risk of leakage caused by pressure fluctuations;

[0058] The optimization of the material characteristics of the initial seal mainly considers: the oil temperature of the automobile transmission is usually between 90 and 110°C. When the vehicle is in normal driving condition, the maximum transmission oil temperature will not exceed 135°C. However, considering that in abnormal conditions of the vehicle, it is also necessary to try to ensure that the seal of the oil inlet joint 310 does not fail. Therefore, it is necessary to set a second sealing ring 3311 on the oil inlet joint 310. The material characteristics of the initial seal are: the second sealing ring 3311 adopts an elastic material with a working temperature of 80 to 120°C and a maximum temperature of 300°C without failure; such as: a graphite sealing ring, this sealing ring has the characteristics of expanded graphite, can withstand violent alternating temperatures and pressures, and maintain good sealing performance in a high temperature environment of 400°C; another example: a polytetrafluoroethylene sealing ring, this sealing ring has excellent temperature resistance and chemical stability, is suitable for high temperature and strong corrosion environments, has a melting point of 327°C, and can remain stable in a high temperature environment;

[0059] The temperature of the cooling water in the water outlet chamber 200 and the temperature of the cooled engine oil are usually between 70 and 90° C. Considering economy and practicality, the first sealing ring 12101 and the third sealing ring 3312 are made of common elastic materials, such as various rubber rings.

[0060] S500, decomposing and optimizing the original oil cooler structure according to the obtained characteristic optimization strategy of the initial joint 300 and the initial seal, to obtain an optimized structure of the initial oil cooler;

[0061] like Figure 2-3 As shown, the initial optimized structure of the initial oil cooler is:

[0062] The oil cooler comprises an initial cooling pipe 100 and an initial joint 300, wherein the initial joint 300 is movably connected to the initial cooling pipe 100;

[0063] like Figure 2-3 As shown, the initial cooling pipe 100 includes a pipe body 110, and the pipe body 110 includes an outer pipe 113, an inner pipe 111 and an oil pipe 112 between the outer pipe 113 and the inner pipe 111. A base 120 is provided at each end of the pipe body 110. The base 120 is cylindrical and has a wedge-shaped portion 122 at one end. The wedge-shaped portion 122 is clamped on the inner wall of the pipe body 110; the other end of the base 120 is opened and communicated with the water outlet chamber 200; a connecting portion 121 is provided on the upper part of the base 120, and the connecting portion 121 is circular and has a first groove 1210 on the outer ring, a boss is provided on the inner ring, and a connecting hole 1211 is provided in the boss, and a circle of connecting surface 1212 is provided on the top of the connecting hole 1211; an internal thread (not shown) is provided under the connecting surface 1212;

[0064] like Figure 4 As shown, the initial joint 300 includes a joint body 330, wherein the joint body 330 is provided with a through hole inside and a flange outside, wherein the flange is connected to the oil pipeline, and a second groove 331 is provided below the flange, and an external thread (not shown in the figure) is provided at the lower part of the second groove 331;

[0065] like Figure 7 As shown, the external thread of the initial joint 300 is connected to the internal thread of the initial tube body 110; the initial joint 300 at one end of the tube body 110 is connected to the oil inlet of the oil pipeline, and the initial joint 300 is the oil inlet joint 310; the initial joint 300 at the other end of the tube body 110 is connected to the oil outlet of the oil pipeline, and the initial joint 300 is the oil outlet joint 320.

[0066] like Figure 5 As shown, the connecting surface 1212 is a bevel connecting surface 12122 , and the bevel connecting surface 12122 is formed by expanding obliquely toward the outer circle at the top of the connecting hole 1211 to form a bevel.

[0067] like Figure 6 As shown, the connecting surface 1212 is a curved connecting surface 12121 , and the curved connecting surface 12121 is formed by tilting and expanding in a curved manner at the top of the connecting hole 1211 , and the curved connecting surface 12121 is an S-shaped curved connecting surface 12121 .

[0068] like Figure 2 As shown, a first sealing ring 12101 is provided in the first groove 1210 , and the first sealing ring 12101 is used for sealing the tube body 110 and the water outlet chamber 200 .

[0069] like Figure 2 As shown, a second sealing ring 3311 is provided in the second groove 331 of the oil inlet joint 310 , and the second sealing ring 3311 is used for sealing the tube body 110 and the oil inlet joint 310 .

[0070] like Figure 2 As shown, a third sealing ring 3312 is provided in the second groove 331 of the oil outlet joint 320 , and the third sealing ring 3312 is used for sealing the tube body 110 and the oil outlet joint 320 .

[0071] In some embodiments, sealing tape is wrapped on the external thread of the initial joint 300 to further enhance the sealing effect.

[0072] S600, calculating the heat exchange efficiency improvement value of the initial oil cooler optimized structure according to the initial oil cooler optimized structure, and obtaining the final oil cooler optimized structure when the heat exchange efficiency improvement value meets the design requirements.

[0073] In actual implementation, the design requirement for the heat exchange efficiency improvement value is >20%. The heat exchange efficiency improvement value calculation process is as follows:

[0074] The heat conduction formula is a mathematical expression that describes the rate at which heat is transferred within an object or between objects due to temperature differences. During the heat conduction process, heat flows from a high temperature area to a low temperature area until the temperatures of the two areas reach equilibrium. The heat conduction formula can be expressed as:

[0075] Q=kA·ΔT (1)

[0076] Where: Q represents the rate of heat transfer, in W / m 2 ; k represents the thermal conductivity of the material, unit is W / (m·K); A represents the heat transfer area, i.e., the contact area between the cooling pipe 100 and the cooling water, unit is m 2 ; ΔT represents the temperature difference between the engine oil and the cooling water, in K;

[0077] According to the above heat conduction formula, when the thermal conductivity k of the material and the temperature difference ΔT remain unchanged, and the sealing requirements of the optimized joint 300 and the cooling pipe 100 are equivalent to the sealing requirements of the joint and the cooling pipe before optimization, increasing the heat transfer area A can improve the heat exchange efficiency. The heat transfer area A is the sum of the surface areas of the inner tube 111 and the outer tube 113. The actual improvement value of the heat exchange efficiency is as follows:

[0078] The heat transfer area before optimization is A1:

[0079] A1=(D1+D2)·π·L (2)

[0080] The optimized heat transfer area is A2:

[0081] A2=(D1+H+D2+H)·π·L (3)

[0082] Heat exchange efficiency improvement value Δη:

[0083]

[0084] Where: The heat transfer area before optimization is A1, unit is m 2 ; The optimized heat transfer area is A2, in m 2 ; The heat exchange efficiency improvement value is Δη, in %; D1 is the diameter of the inner tube 111, in m; D2 is the diameter of the outer tube 113, in m; H is the height of the joint 300, in m; π is the circumference; L is the length of the cooling tube 100, in m;

[0085] In some embodiments of the present invention, the diameter D1 of the inner tube 111 is 0.03 m; the diameter D2 of the outer tube 113 is 0.035 m; the height H of the joint 300 is 0.018 m; and L is the length of the cooling tube 100, which is 0.36 m:

[0086]

[0087] That is, the heat exchange efficiency improvement value Δη is 55%, which meets the design requirements. Therefore, the initial optimized structure of the oil cooler is the final optimized structure of the oil cooler.

[0088] Although increasing the width of the water outlet chamber 200 can also improve the heat exchange efficiency of the automobile transmission oil cooler, the increase in the water outlet chamber 200 means that its assembly position and relationship with other structures in the transmission will change, and the transmission needs to be redesigned, which increases the design and manufacturing costs. At the same time, increasing the width of the water outlet chamber 200 will increase the overall weight of the cooler, which is disadvantageous for modern automobile designs that pursue lightweight. Therefore, the present invention adopts the above-mentioned method for optimizing the heat exchange efficiency of the automobile transmission oil cooler, and achieves the condition that the volume of the water outlet chamber 200 remains unchanged, through the split design of the joint 300 and the cooling pipe 100, so as to effectively improve the heat exchange efficiency of the automobile transmission oil cooler.

[0089] It should be understood that the above-mentioned embodiments are one or more embodiments of the present invention, and there are many other embodiments and variations thereof based on the present invention; the variations and modifications made by ordinary technicians in this industry through the present invention without making pioneering innovations all fall within the scope of protection of the present invention.

Claims

1. A method for optimizing the heat exchange efficiency of an automobile transmission oil cooler, characterized in that: The following steps are involved: S100, obtaining structural characteristics of the original oil cooler; S200, analyzing the characteristics of the original oil cooler; S300, extracting the structural features of the original joint of the original oil cooler and obtaining an initial joint structure optimization strategy; S400, determining an optimization strategy for the initial sealing feature corresponding to the optimized initial joint structure; S500, decomposing and optimizing the original oil cooler structure according to the obtained characteristic optimization strategy of the initial joint and the initial seal, to obtain an optimized structure of the initial oil cooler; S600, calculating the heat exchange efficiency improvement value of the initial oil cooler optimized structure according to the initial oil cooler optimized structure, and obtaining the final oil cooler optimized structure when the heat exchange efficiency improvement value meets the design requirements.

2. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 1, characterized in that: The initial joint structure optimization strategy in step S300 includes the basic optimization principles and optimization design of the initial joint structure, wherein the basic optimization principles include: a split design principle and a movable connection principle; the split design principle is that the initial joint structure and the initial cooling pipe in the initial oil cooler are designed separately; the movable connection principle is that the initial joint is movably connected to the initial cooling pipe; the initial joint structure optimization design is that the initial joint is installed after the initial cooling pipe is assembled, and the initial joint is detachable.

3. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 1, characterized in that: The feature optimization strategy of the initial seal corresponding to the initial joint in step S400 includes the structural features and material features of the initial seal; The structural feature of the initial seal is that a sealing structure that seals with the water outlet chamber is arranged on the initial cooling pipe, and the sealing structure is a first sealing ring; a sealing structure that seals with the initial cooling pipe is arranged on the initial joint, and the initial joint is divided into an initial oil inlet joint and an initial oil outlet joint, a second sealing ring is arranged on the initial oil inlet joint, and a third sealing ring is arranged on the initial oil outlet joint; the material feature of the initial seal is that the first sealing ring and the third sealing ring are made of ordinary elastic material; the second sealing ring is made of elastic material that has a working temperature of 80 to 120°C and does not fail at a maximum temperature of 300°C.

4. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 1, characterized in that: The optimized structure of the initial oil cooler in step S500 is as follows: the initial oil cooler comprises an initial cooling pipe and an initial joint, and the initial joint is movably connected to the initial cooling pipe; The initial cooling pipe comprises a pipe body, which comprises an outer pipe, an inner pipe and an oil pipe between the outer pipe and the inner pipe. A base is respectively provided at both ends of the pipe body, and one end of the base is cylindrical and has a wedge-shaped portion, and the wedge-shaped portion is clamped on the inner wall of the pipe body; the other end of the base is open and communicates with the water outlet chamber; a connecting portion is provided on the upper part of the base, and the connecting portion is circular and has a first groove on the outer ring, a boss on the inner ring, a connecting hole in the boss, a connecting surface on the top of the connecting hole, and an internal thread under the connecting surface; The initial joint comprises a joint body, a through hole is provided in the joint body, a flange is provided on the outside, the upper part of the flange is connected to the oil pipeline, the lower part of the flange is provided with a second groove, and the lower part of the second groove is provided with an external thread; The oil pipeline is divided into an oil inlet and an oil outlet. The initial joint connected to the oil inlet is the oil inlet joint; the initial joint connected to the oil outlet is the oil outlet joint; the bases at both ends of the tube body are threadedly connected to the oil inlet joint and the oil outlet joint respectively.

5. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 4, characterized in that: The connecting surface is a bevel connecting surface, and the bevel connecting surface is formed by expanding obliquely toward the outer circle at the top of the connecting hole to form a bevel.

6. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 4, characterized in that: The connecting surface is a curved connecting surface, and the curved connecting surface is formed by tilting and expanding in a curve manner at the top of the connecting hole to form a curved surface.

7. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 6, characterized in that: The curved connecting surface is an S-shaped curved connecting surface.

8. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 4, characterized in that: A first sealing ring is arranged in the first groove, and the first sealing ring is used for sealing the tube body and the water outlet chamber.

9. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 4, characterized in that: A second sealing ring is arranged in the second groove of the oil inlet joint, and the second sealing ring is used for sealing the tube body and the oil inlet joint.

10. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 4, characterized in that: A third sealing ring is arranged in the second groove of the oil outlet joint, and the third sealing ring is used for sealing the pipe body and the oil outlet joint.

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