A method for optimizing the heat exchange efficiency of automobile transmission oil cooler

Abstract

The present invention proposes a method for optimizing the heat exchange efficiency of an automobile transmission oil cooler, which belongs to the technical field of oil coolers. The method finds a key part for improving the heat exchange efficiency of the cooler, namely, the connection method of the cooling pipe body and the joint; the cooling pipe body and the joint structure are optimized to meet the movable connection method, and the problem existing in this connection method, namely, the sealing problem of the movable connection, is found; by designing the structural characteristics and material characteristics of the sealing structure, the sealing problem of the movable connection is solved, the initial optimized structure of the oil cooler is obtained, and the heat exchange efficiency improvement value is calculated. When the heat exchange efficiency improvement value meets the design requirements, the final optimized structure of the oil cooler is obtained; the structure adopts a separate design of the joint and the cooling pipe, and a movable connection. The joint is installed after the cooling pipe is assembled into and out of the water chamber. Under the same outlet chamber width, a cooling pipe with a larger diameter can be installed, thereby improving the heat exchange efficiency of the automobile transmission oil cooler.

Description

Technical Field

[0001] The present invention relates to the technical field of oil coolers, and in particular to a method for optimizing the heat exchange efficiency of an automobile transmission 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 an appropriate 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. It is an integrated oil cooler. Existing cooling pipes such as Patent No. CN117583495B, title: A Tubular Oil Cooler Automatic Assembly Equipment, the background technology mentioned in its "As a type of oil cooler, the tubular oil cooler includes an outer tube, an inner tube, fins 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 semicircular shape, and then The tube is placed onto the semicircular fins, which are then bent again so that the fins wrap around the inner tube. The finned inner tube is then placed inside the outer tube. The inner tube is expanded to secure the fins to the outer tube. Welding agent is then applied to the joint, which is then inserted between the inner and outer tubes to complete the oil cooler assembly. This tubular oil cooler, with the tube body and joint welded together before being installed in the outlet chamber, limits the cooling tube diameter, resulting in low heat exchange efficiency. To meet the energy-saving demands of today's automotive market, an optimization method is needed to improve the heat exchange efficiency of the transmission oil cooler while maintaining the outlet chamber volume. 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 art.

[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 characteristics of the original oil cooler;

[0008] S300, extracting 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 initial sealing features corresponding to the optimized initial joint structure;

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

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

[0012] Furthermore, 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 and the initial cooling pipe are movably connected; the initial joint structure optimization design is that the initial cooling pipe is assembled and then the initial joint is installed, 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 characteristics of the initial seal are that a first sealing structure that is sealed with the water outlet chamber is set on the initial cooling pipe, and the first sealing structure is a first sealing ring; a second sealing structure that is sealed with the initial cooling pipe is set 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 provided on the initial oil inlet joint, and a third sealing ring is provided 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 80-120°C and a maximum temperature of 300°C.

[0014] Furthermore, the optimized structure of the initial oil cooler in step S500 is as follows: the initial oil cooler includes 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 includes a pipe body, which includes an outer pipe, an inner pipe and an oil pipe between the outer pipe and the inner pipe. A base is provided at each end of the pipe body. The base is cylindrical and has a wedge-shaped portion at one end. 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. The connecting portion is circular and has a first groove on the outer ring and a boss on the inner ring. A connecting hole is provided in the boss. A connecting surface is provided on the top of the connecting hole, and an internal thread is provided under the connecting surface.

[0016] The initial joint includes 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 features of integrated oil coolers like the original oil cooler were analyzed to identify a key feature for improving the cooler's heat exchange efficiency: the connection method between the cooling tube body and the connector. The original oil cooler's integrated connector cooling tube structure was directly welded to the original cooling tube, fixedly connected to the original cooling tube's crude oil pipe. To improve heat exchange efficiency, the contact area between the original cooling tube and the cooling water in the water outlet chamber needed to be increased. Increasing the diameter of the original cooling tube also increased the surface area of its inner and outer tubes, which in turn increased the contact area between the original cooling tube and the cooling water. However, this design made it impossible for the integrated cooling tube to be installed in the water outlet chamber. If the water outlet chamber size was increased instead, it would not fit into the design space reserved for the vehicle's transmission.

[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 diameter of the initial outer pipe is smaller than the width of the water outlet chamber; the initial joint is movably connected to the initial cooling pipe; and the initial joint is installed after the initial cooling pipe is assembled, so that the size of the water outlet chamber remains unchanged, and the inner and outer pipes 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 increased, which can improve the heat exchange efficiency.

[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 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, and a third sealing ring is provided on the initial oil outlet joint. Furthermore, the connection surface between the initial joint and the base is configured as an inclined or curved surface. The inclined or curved surface design increases the contact area of the seal compared to a straight surface, improves the stability of the connection surface, and reduces 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 and third sealing rings in the lower ambient temperature; in order to ensure that the sealing material does not fail at high temperatures, the second sealing ring in the higher ambient temperature uses an elastic material with an operating temperature of 80-120°C and a maximum temperature of 300°C without failure. Finally, the optimized structure of the initial automobile transmission oil cooler was obtained.

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

[0031] Figure 1 This is a flow chart of a method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to 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 connection surface according to an embodiment of the present invention;

[0036] Figure 6 is a cross-sectional elevation view of a base having 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 connector and the base of the present invention;

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

[0039] Reference numerals in the figure: 100-cooling pipe, 110-tube body, 111-inner pipe, 112-oil pipe, 113-outer pipe, 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-connector, 310-oil inlet connector, 320-oil outlet connector, 330-connector body, 331-second groove, 3311-second sealing ring, 3312-third sealing ring. DETAILED DESCRIPTION

[0040] The following describes in detail specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments provided herein are intended only to illustrate and explain the present invention and are not intended 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. However, the present invention may also have other embodiments and variations thereof. Therefore, the scope of protection 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:

[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 the original outer pipe and the original inner pipe, and the original 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 the original oil inlet joint and the 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 a structural optimization strategy for the initial joint 300; conducting a structural optimization design study for 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 for the initial joint 300. The structural optimization strategy for the initial joint 300 includes a basic structural optimization principle for the initial joint 300 and an optimized structural design for the initial joint 300, wherein the basic optimization principle includes a split design principle and a movable connection principle; the split design principle is that the initial joint 300 structure and the initial cooling pipe 100 are designed separately; the movable connection principle is that the initial joint 300 and the initial cooling pipe 100 are movably connected; the structural optimization design for the initial joint 300 is that the initial cooling pipe 100 is assembled before installation, and the initial joint 300 is detachable;

[0046] The original oil cooler's integrated joint cooling pipe structure is to directly weld the original joint to the original cooling pipe and fixedly connect it to the crude oil pipe of the original cooling pipe. Considering the structural form and assembly process characteristics of the integrated joint cooling pipe, it is known that in order to improve 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. As the diameter of the original cooling pipe increases, the surface area of its inner and outer pipes also increases, that is, the contact area between the original cooling pipe and the cooling water also increases. However, such a design will result in the integrated cooling pipe being unable to be installed in the water outlet chamber 200. If the size of the water outlet chamber 200 is increased instead, it will also be unable to be installed in the design space reserved for the automobile gearbox.

[0047] Specifically, the integrated 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, in order to be inserted and assembled normally; 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, the cooling pipe cannot be inserted and assembled.

[0048] Therefore, under the condition that 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] From the joint structure of the above-mentioned integrated joint cooling pipe, it can be seen 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, to be installed into the initial cooling pipe 100. After optimization, the maximum diameter of the initial outer pipe 113 of the initial cooling pipe 100 is It can be the width W of the outlet chamber 200 plus the height H of the initial joint 300, that is, In order to keep the size of the water outlet chamber 200 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, which is movably connected to the initial joint 300 through the connecting component, so that the initial joint 300 can be installed 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 part 121 is provided on the upper part of the base 120. The connecting part 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 corresponding initial sealing feature optimization strategy; 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 provided on the initial joint 300. 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 that has an operating temperature of 80-120°C and a maximum temperature of 300°C without failure.

[0056] like Figure 7 As shown, the structural feature optimization of the initial seal mainly considers that, since the exterior 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 interior 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 planar connection surfaces. Due to the simple structure of planar connection surfaces, 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 connection surface 12122. The inclined surface design makes the contact area of the seal larger than that of a straight surface, which can ensure that the seal fits more closely on the sealed surface when under pressure, forming a more secure seal; for example, the curved connection surface 12121. The curved surface design can also provide a larger contact area. At the same time, when subjected to axial pressure, it can more evenly distribute the pressure, 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 temperature of the transmission oil 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 is made of an elastic material that does not fail at a working temperature of 80 to 120°C and a maximum temperature of 300°C; such as: a graphite sealing ring. This sealing ring has the characteristics of expanded graphite, can withstand drastic changes in temperature and pressure, 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, and is suitable for high temperature and highly corrosive environments. Its melting point is 327°C and it 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 ordinary elastic materials, such as various rubber rings.

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

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

[0062] The oil cooler includes 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, which 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 to the inner wall of the pipe body 110; the other end of the base 120 is open and communicates 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 on the inner ring, a connecting hole 1211 in the boss, and a connecting surface 1212 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, a through hole is provided in the joint body 330, and a flange is provided on the outside. The flange is connected to the oil pipeline, and a second groove 331 is provided under the flange. The lower part of the second groove 331 is provided with an external thread (not shown in the figure);

[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 around the external threads of the initial joint 300 to further enhance the sealing effect.

[0072] S600 , calculating a heat exchange efficiency improvement value of the initial optimized oil cooler structure according to the initial optimized oil cooler structure, and obtaining a final optimized oil cooler 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 heat conduction, 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, the unit is 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 between the optimized joint 300 and the cooling pipe 100 are equivalent to the sealing requirements between 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 in 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 of a circle; 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 not conducive to the pursuit of lightweight modern automobile design. 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 separate design of the joint 300 and the cooling pipe 100, effectively improving the heat exchange efficiency of the automobile transmission oil cooler.

[0089] It should be understood that the above 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 groundbreaking 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 characteristics of the original oil cooler; S300, extracting 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 initial sealing features corresponding to the optimized initial joint structure; S500, decomposing and optimizing the original oil cooler structure according to the obtained feature optimization strategy of the initial joint and the initial seal to obtain an optimized initial oil cooler structure; S600, calculating a heat exchange efficiency improvement value of the initial optimized oil cooler structure based on the initial optimized oil cooler structure, and obtaining a final optimized oil cooler structure when the heat exchange efficiency improvement value meets the design requirements; 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 and the initial cooling pipe are movably connected; the initial joint structure optimization design is that the initial cooling pipe is assembled before the initial joint is installed, and the initial joint is detachable; The feature optimization strategy for 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 provided 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 provided on the initial joint, and the initial joint is divided into an initial oil inlet joint and an initial oil outlet joint, and the initial oil inlet joint is provided with a second sealing ring, and the initial oil outlet joint is provided with a third sealing ring; the material features of the initial seal are that the first sealing ring and the third sealing ring are made of ordinary elastic material; the second sealing ring is made of an elastic material that has an operating temperature of 80-120°C and does not fail at a maximum temperature of 300°C; The optimized structure of the initial oil cooler in step S500 is as follows: the initial oil cooler includes an initial cooling pipe and an initial joint, and the initial joint is movably connected to the initial cooling pipe; The initial cooling pipe includes a pipe body, which includes an outer pipe, an inner pipe and an oil pipe between the outer pipe and the inner pipe. A base is provided at each end of the pipe body. The base is cylindrical and has a wedge-shaped portion at one end. 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. The connecting portion is circular and has a first groove on the outer ring and a boss on the inner ring. A connecting hole is provided in the boss. A connecting surface is provided on the top of the connecting hole, and an internal thread is provided under the connecting surface. The initial joint includes 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.

2. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 1, 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.

3. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 1, characterized in that: 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.

4. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 3, characterized in that: The curved connecting surface is an S-shaped curved connecting surface.

5. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 1, characterized in that: 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.

6. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 1, characterized in that: 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.

7. The method for optimizing the heat exchange efficiency of an automobile transmission oil cooler according to claim 1, characterized in that: 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 pipe body and the oil outlet joint.

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