A topological optimization-based gear selection and shift soft shaft support and gear selection and shift system

Abstract

The utility model relates to the field of automobile transmission technology discloses a kind of gear selecting and shifting soft axle support and gear selecting and shifting system based on topology optimization, including support body, the support body includes gearbox middle shell support arm, gearbox front shell first support arm, gearbox front shell second support arm, gear shifting soft axle support arm and gear selecting soft axle support arm;Gearbox middle shell support arm and gearbox front shell first support arm between being provided with included angle;The plane of gearbox front shell second support arm and the plane of gearbox front shell first support arm are perpendicular to each other, and the acute angle is provided between the vertical plane of gearbox front shell second support arm towards gearbox front shell first support arm;Gear shifting soft axle support arm and gear selecting soft axle support arm are respectively arranged in the rear end of gearbox front shell second support arm;The hole of gearbox middle shell support arm, gearbox front shell first support arm and gearbox front shell second support arm jointly constitute the three-point support static structure of space;The utility model realizes lightweight and higher supporting strength.

Description

Technical Field

[0001] This utility model relates to the field of automotive transmission technology, and in particular to a gear shifting flexible shaft bracket and gear shifting system based on topology optimization. Background Technology

[0002] See Figures 1-4 As shown, the gear selector cable is a key component of the automotive gear shifting system. Its bracket is used to reliably fix the cable to the gearbox, ensuring accurate transmission of shifting force.

[0003] Traditional gear shift cable shaft brackets are mostly designed based on experience, and generally suffer from the following problems:

[0004] 1. Structural redundancy and excessive weight: To ensure safety, traditional designs often adopt conservative symmetrical or densely reinforced structures such as "four-point support", without optimizing the material distribution, resulting in material waste and increased vehicle weight, which is not conducive to energy conservation and emission reduction.

[0005] 2. Lack of scientific optimization design methods: Traditional design relies on engineers' experience and repeated trial and error, failing to make full use of modern structural optimization theory, resulting in long development cycles and difficulty in finding the best balance between lightweight and high strength.

[0006] 3. Low system integration: The bracket, flexible shaft, and gearbox housing are usually designed and optimized independently, lacking system-level coordination. This may result in some parts of the structure being too strong or too weak, failing to achieve optimal overall system performance and weight. Figure 4 The small square in the figure represents the region of maximum Mises stress under the worst operating conditions of the existing technology structure.

[0007] Therefore, existing technologies urgently need a new type of gear shifting solution that can achieve significant weight reduction and cost reduction while ensuring sufficient strength and rigidity through collaborative optimization at the system level. Utility Model Content

[0008] To address the aforementioned issues, this invention provides a topology-optimized gear shifting flexible shaft bracket and gear shifting system, aiming to overcome the deficiencies of existing technologies and provide a system-level lightweight gear shifting solution based on topology optimization theory. The purpose is to achieve optimal design of the entire subsystem by redefining the connection relationship between the bracket and the gearbox housing.

[0009] This utility model proposes a gear shift flexible shaft support based on topology optimization, including a support body, which includes a gearbox middle housing support arm, a gearbox front housing first support arm, a gearbox front housing second support arm, a gear shift flexible shaft support arm, and a gear selection flexible shaft support arm.

[0010] The gearbox middle housing support arm and the gearbox front housing first support arm are located on the same horizontal plane, and there is an included angle between the gearbox middle housing support arm and the gearbox front housing first support arm.

[0011] The plane where the second support arm of the front housing of the gearbox is located is perpendicular to the plane where the support arm of the middle housing of the gearbox and the first support arm of the front housing of the gearbox are located, and there is an acute angle between the side wall of the second support arm of the front housing of the gearbox facing the front housing and the vertical plane where the support arm of the middle housing of the gearbox and the first support arm of the front housing of the gearbox are located.

[0012] The rear end of the second support arm of the front housing of the gearbox extends horizontally to the other side of the vertical plane where the support arm of the middle housing of the gearbox and the first support arm of the front housing of the gearbox are located, and the upper and lower end faces of the horizontal extension are respectively vertically connected to the shift flexible shaft support arm and the gear selection flexible shaft support arm; the shift flexible shaft support arm and the gear selection flexible shaft support arm are parallel to the plane where the support arm of the middle housing of the gearbox and the first support arm of the front housing of the gearbox are located.

[0013] The gearbox middle housing support arm has a gearbox middle housing mounting hole at its end, which is a vertical mounting hole in the Z direction. The gearbox front housing first support arm has a gearbox front housing first mounting hole at its end, which is a vertical mounting hole in the Z direction. The gearbox front housing second support arm has a gearbox front housing second mounting hole at its end, which is a horizontal mounting hole in the Y direction. The shift cable support arm has a shift cable fixing hole at its end, and the gear selector cable support arm has a gear selector cable fixing hole at its end. The gearbox middle housing mounting hole, the gearbox front housing first mounting hole, and the gearbox front housing second mounting hole together constitute a three-point supported statically determinate structure in space. Compared with the prior art, this application reduces the two-point support in the Z direction (the vertical height direction of the gearbox) to a single support based on topology optimization theory, while retaining the X direction (the horizontal length direction of the gearbox). The system employs a two-point support structure with supports in the Y-axis (width direction) and Y-axis (width direction to the left and right of the gearbox). However, the included angle of these two-point support arms has been optimized, eliminating a redundant support arm and support point in the Y-axis direction. This reduces the weight of the bracket while increasing its support strength. This constitutes an innovative "three-point support system." The design of this system is based on the material distribution results obtained after topology optimization analysis of the entire system (including the bracket and mounting boundaries). This optimization result not only derives the macroscopic layout of the three-point support but also precisely defines the optimal geometric relationship of each support arm in space. The three-point support is a statically determinate structure that can adapt to minor unevenness of the mounting surface, ensuring complete contact between the three mounting points and the gearbox housing. This fundamentally eliminates the assembly stress caused by over-constraint in four-point support (statically indeterminate structure) (see [reference]). Figure 9 As shown in the figure, the small box contains the fourth installation support point of the existing technology bracket, making the stress state more ideal and predictable.

[0014] The lower ends of the gearbox middle housing support arm and the gearbox front housing first support arm are connected to form a V-shaped structure. The included angle α between the two is 70°-100°. This angle is the core of the triangular support area. Its range ensures that the force from the flexible shaft fixing hole can be distributed to the gearbox middle housing mounting hole and the gearbox front housing first mounting hole in the optimal path, forming a stable main load-bearing structure.

[0015] The angle β between the lower end of the side wall of the first support arm of the gearbox front housing and the plane where the second support arm of the gearbox front housing is located is 30°-50°. This angle ensures that the first support arm of the gearbox front housing with the first mounting hole of the gearbox front housing can effectively transmit the lateral load from the flexible shaft to the front housing, while avoiding interference with surrounding components.

[0016] The end of the second support arm of the front housing of the transmission starts from the lower end connection of the V-shaped support arm of the middle housing of the transmission and the first support arm of the front housing of the transmission. The second support arm of the front housing of the transmission is inclined towards the first support arm of the front housing of the transmission in the plane. The angle γ between the end of the side wall of the second support arm of the front housing of the transmission and the plane of the first support arm of the transmission is 40°-70°. This angle defines the tilting posture of the second support arm of the front housing of the transmission in space, so that it can most effectively transfer the load to the middle housing of the transmission.

[0017] The second support arm of the gearbox front housing has a wedge-shaped structure that is narrower at the front and wider at the rear. The included angle δ between the two side walls at the front end of the second support arm of the gearbox front housing is 5°-20°. This small angle design makes the second support arm of the gearbox front housing with the second mounting hole of the gearbox front housing slightly wedge-shaped, which not only ensures sufficient contact area and installation rigidity required for connection with the gearbox front housing, but also achieves gradient distribution of materials and avoids stress concentration at the root. The topology optimization results show that the three-point support provides a shorter and more direct transmission path for shifting force. The force starts from the flexible shaft fixing hole and is most effectively distributed to the three mounting points through the bracket body, avoiding force detours and local concentration, thereby achieving higher structural efficiency with less material.

[0018] The second mounting hole in the front housing of the gearbox and the fixing hole for the shift flexible shaft are both located near the geometric center of the triangular support area formed by the three mounting points: the mounting hole in the middle housing of the gearbox, the first mounting hole in the front housing of the gearbox, and the second mounting hole in the front housing of the gearbox. This layout structure allows the shifting force to be evenly transmitted to the three mounting points through the shortest path. The shape of the bracket body is a physical representation of the optimal force transmission path calculated by topology optimization. It removes material from the non-primary stress areas of the prior art and forms a centralized reinforcement structure on the primary force transmission path.

[0019] The support body is made of ZL101A (ZL101A is an Al-Si-Mg heat-treatable cast aluminum alloy, its alloy code is ZAlSi7MgA, it has good casting performance, no tendency to hot crack, small linear shrinkage, and high air tightness. The surface is easy to form a dense oxide film, and has good corrosion resistance.) (GB / T 1173-2013).

[0020] A topology-optimized gear shifting system includes a shift flexible shaft, a gear selection flexible shaft, and a gearbox housing. It also includes a topology-optimized gear selection flexible shaft bracket. The shift flexible shaft and the gear selection flexible shaft are respectively screwed into the shift flexible shaft fixing holes and the gear selection flexible shaft fixing holes of the gear selection flexible shaft support arm, respectively, via a base. A gearbox middle housing mounting hole is screwed into the middle of the upper end wall of the gearbox housing. A first mounting hole in the front housing is screwed into the front part of the upper end wall of the gearbox housing, and a second mounting hole in the front housing is screwed into the front part of the side wall of the gearbox housing. Systemic lightweighting and performance improvement: By treating the bracket and gearbox housing mounting points as a unified system and performing topology optimization, overall lightweighting and performance enhancement are achieved. Structural efficiency is maximized. Experiments have verified that the support structure of this invention is 30% lighter than the traditional four-point support structure. More importantly, finite element analysis under simulated working conditions shows that, compared to the existing four-point support structure, the maximum Mises stress (also known as von Mises stress, the core of which is an equivalent stress used to determine the yield of plastic materials, simplifying the complex three-dimensional stress state into a single scalar value, facilitating rapid assessment of whether the material has reached its yield limit in engineering design) of the three-point support structure of this invention is reduced by an average of 17.56% (as shown in the table below). This not only proves the effectiveness of lightweighting but also significantly improves the safety margin and fatigue life of the structure.

[0021] Beneficial effects

[0022] The fundamental advantage of this utility model, which reduces the four points of support in the prior art to the three points of support in this application, is that:

[0023] 1. Adhering to the principle of static determinateness to eliminate assembly stress: Three-point support is a statically determinate structure that can adapt to minor unevenness of the mounting surface and ensure that the three mounting points are in complete contact. This fundamentally eliminates the assembly stress caused by over-constraint in four-point support (statically indeterminate structure), making the stress state more ideal and predictable.

[0024] Optimize the force flow path to achieve efficient force transmission: Topology optimization results show that the three-point support provides a shorter and more direct transmission path for shifting force; the force starts from the fixed hole of the flexible shaft and is most effectively distributed to the three mounting points through the main body of the bracket, avoiding force detours and local concentration, thereby achieving higher structural efficiency with less material.

[0025] Facilitating system weight reduction: Removing a support point directly eliminates redundant connecting structures, creating a prerequisite for the extreme lightweighting of the support body. Simultaneously, the efficient force transmission reduces the requirements for local material strength, providing room for further weight reduction.

[0026] This invention aims to overcome the aforementioned deficiencies of the prior art and provide a system-level lightweight gear shifting scheme based on topology optimization theory; the purpose is to achieve the optimal design of the entire subsystem by redefining the connection relationship between the bracket and the gearbox housing. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the existing three-dimensional structure.

[0028] Figure 2 This is a schematic diagram of a partial structure of existing technology.

[0029] Figure 3 This is the Mises stress analysis cloud map representing the worst operating conditions currently available with existing technology.

[0030] Figure 4 It is a topology optimization cloud map of the gear shift flexible shaft bracket after simulation filling using existing technology.

[0031] Figure 5 This is a three-dimensional structural diagram of the present invention.

[0032] Figure 6 This is a partial structural schematic diagram of the present invention.

[0033] Figure 7 This is the most severe working condition Mises stress analysis cloud of this utility model. Figure 1 .

[0034] Figure 8 This is the most severe working condition Mises stress analysis cloud of this utility model. Figure 2 .

[0035] Figure 9 This is an assembly diagram of the gear shifting system of this utility model.

[0036] In the picture:

[0037] 1. Bracket body; 1.1. Transmission middle housing support arm; 1.2. Transmission front housing first support arm; 1.3. Transmission front housing second support arm; 1.4. Shift cable support arm; 1.5. Gear selector cable support arm; 1.6. Transmission middle housing mounting hole; 1.7. Transmission front housing first mounting hole; 1.8. Transmission front housing second mounting hole; 1.9. Shift cable fixing hole; 1.10. Gear selector cable fixing hole;

[0038] 2. Shift cable;

[0039] 3. Gear selector flexible shaft;

[0040] 4. Gearbox housing. Detailed Implementation

[0041] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Specifically, the terms "first position" and "second position" refer to two different positions.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] Example 1

[0045] See Figures 5-8 As shown, a topology-optimized gear shift flexible shaft support includes a support body 1, which includes a gearbox middle housing support arm 1.1, a gearbox front housing first support arm 1.2, a gearbox front housing second support arm 1.3, a gear shift flexible shaft support arm 1.4, and a gear selection flexible shaft support arm 1.5.

[0046] The transmission housing support arm 1.1 and the transmission front housing first support arm 1.2 are located on the same horizontal plane, and there is an included angle between the transmission housing support arm 1.1 and the transmission front housing first support arm 1.2;

[0047] The plane on which the second support arm 1.3 of the front housing of the gearbox is located is perpendicular to the plane on which the support arm 1.1 of the middle housing of the gearbox and the first support arm 1.2 of the front housing of the gearbox are located, and there is an acute angle between the side wall of the second support arm 1.3 of the front housing of the gearbox facing the front housing and the vertical plane on which the support arm 1.1 of the middle housing and the first support arm 1.2 of the front housing of the gearbox are located.

[0048] The rear end of the second support arm 1.3 of the front housing of the transmission extends horizontally to the other side of the vertical plane where the support arm 1.1 of the middle housing of the transmission and the first support arm 1.2 of the front housing of the transmission are located, and the upper and lower end faces of the horizontal extension are respectively vertically connected to the shift flexible shaft support arm 1.4 and the gear selection flexible shaft support arm 1.5; the shift flexible shaft support arm 1.4 and the gear selection flexible shaft support arm 1.5 are parallel to the plane where the support arm 1.1 of the middle housing of the transmission and the first support arm 1.2 of the front housing of the transmission are located;

[0049] The gearbox housing support arm 1.1 has a gearbox housing mounting hole 1.6 at its end, which is a Z-direction vertical mounting hole. The gearbox front housing first support arm 1.2 has a gearbox front housing first mounting hole 1.7 at its end, which is also a Z-direction vertical mounting hole. The gearbox front housing second support arm 1.3 has a gearbox front housing second mounting hole 1.8 at its end, which is a Y-direction horizontal mounting hole. The shift flexible shaft support arm 1.4 has a shift flexible shaft fixing hole 1.9 at its end. The gear selection flexible shaft support arm 1.5 has a gear selection flexible shaft fixing hole 1.10 at its end. The gearbox housing mounting hole 1.6, the gearbox front housing first mounting hole 1.7, and the gearbox front housing second mounting hole 1.8 together constitute a three-point supported statically determinate structure in space.

[0050] The lower ends of the gearbox housing support arm 1.1 and the gearbox front housing first support arm 1.2 are connected to form a V-shaped structure, and the included angle α between the two is 70°-100°.

[0051] The angle β between the lower end of the side wall of the first support arm 1.2 of the front housing of the gearbox and the plane containing the second support arm 1.3 of the front housing of the gearbox is 30°-50°.

[0052] The end of the second support arm 1.3 of the front housing of the gearbox starts from the lower end connection of the V-shaped gearbox middle housing support arm 1.1 and the first support arm 1.2 of the front housing of the gearbox. The second support arm 1.3 of the front housing of the gearbox is inclined towards the first support arm 1.2 of the front housing of the gearbox in the plane. The angle γ between the end of the side wall of the second support arm 1.3 of the front housing of the gearbox on the same side as the first support arm 1.2 of the gearbox and the plane on which the first support arm 1.2 of the gearbox is located is 40°-70°.

[0053] The second support arm 1.3 of the front housing of the gearbox is a wedge-shaped structure that is narrow at the front and wide at the rear. The included angle δ between the two side walls at the front end of the second support arm 1.3 of the front housing of the gearbox is 5°-20°.

[0054] The second mounting hole 1.8 on the front housing of the gearbox and the fixing hole 1.9 on the shift cable are both located near the geometric center of the triangular support area formed by the three mounting points: the mounting hole 1.6 on the middle housing of the gearbox, the first mounting hole 1.7 on the front housing of the gearbox, and the second mounting hole 1.8 on the front housing of the gearbox.

[0055] The support body 1 is made of ZL101A, and its alloy designation is ZAlSi7MgA.

[0056] Example 2

[0057] See Figures 5-9 As shown, a topology-optimized gear shifting system includes a shift flexible shaft 2, a gear selection flexible shaft 3, and a gearbox housing 4. It also includes a topology-optimized gear selection flexible shaft bracket. The shift flexible shaft 2 and the gear selection flexible shaft 3 are respectively fixed by screwing a base into the shift flexible shaft fixing hole 1.9 of the aligned shift flexible shaft support arm 1.4 and the gear selection flexible shaft fixing hole 1.10 of the gear selection flexible shaft support arm 1.5. The gearbox middle housing mounting hole 1.6 is screwed into the middle of the upper end wall of the gearbox housing 4. The gearbox front housing first mounting hole 1.7 is screwed into the front part of the upper end wall of the gearbox housing 4, and the gearbox front housing second mounting hole 1.8 is screwed into the front part of the side wall of the gearbox housing 4.

[0058] See Figure 3 , Figures 7-8 As shown, the stress calculation results of the prior art and this application are compared under simulated working conditions:

[0059] Shift cable working condition 165MPa 128MPa 22.42% Shift line pressure condition 157MPa 135MPa 14.01% Gear selector cable working condition 168MPa 139MPa 17.26% Selective gear pressing line condition 163MPa 136MPa 16.56%

[0060] Performance and reliability are comprehensively improved: Based on the statically determinate characteristics of the three-point support and the optimal force flow path, the stress distribution of the system is more uniform, avoiding local stress concentration and significantly improving fatigue life and reliability; CAE simulation verification shows that its strength, stiffness and durability fully meet the design requirements.

[0061] Significant cost advantages: The weight reduction directly lowers material costs; the simplified bracket structure leads to lower mold costs and increased production efficiency; at the same time, the three-point support allows for a more relaxed requirement on the flatness of the gearbox housing mounting surface, reducing the processing costs of related components.

[0062] Scientific design methodology: The development process of this utility model adopts advanced system-level topology optimization technology, which transforms the traditional "experience-based design" into "science-driven design", shortens the development cycle, and ensures the optimal performance of the product.

[0063] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A gear shifting flexible shaft support based on topology optimization, characterized in that: The bracket body (1) includes a gearbox housing support arm (1.1), a gearbox front housing first support arm (1.2), a gearbox front housing second support arm (1.3), a shift flexible shaft support arm (1.4), and a gear selection flexible shaft support arm (1.5). The transmission housing support arm (1.1) and the transmission front housing first support arm (1.2) are located on the same horizontal plane, and there is an included angle between the transmission housing support arm (1.1) and the transmission front housing first support arm (1.2); The plane containing the second support arm (1.3) of the front housing of the gearbox is perpendicular to the plane containing the support arm (1.1) of the middle housing of the gearbox and the first support arm (1.2) of the front housing of the gearbox, and the side wall of the second support arm (1.3) of the front housing of the gearbox facing the front housing of the gearbox has an acute angle between it and the vertical plane containing the support arm (1.1) of the middle housing of the gearbox and the first support arm (1.2) of the front housing of the gearbox; The rear end of the second support arm (1.3) of the front housing of the gearbox extends horizontally to the other side of the vertical plane where the support arm (1.1) of the middle housing of the gearbox and the first support arm (1.2) of the front housing of the gearbox are located, and the upper and lower end faces of the horizontal extension are respectively vertically connected to the shift flexible shaft support arm (1.4) and the gear selection flexible shaft support arm (1.5); the shift flexible shaft support arm (1.4) and the gear selection flexible shaft support arm (1.5) are parallel to the plane where the support arm (1.1) of the middle housing of the gearbox and the first support arm (1.2) of the front housing of the gearbox are located; The gearbox middle housing support arm (1.1) has a gearbox middle housing mounting hole (1.6) at its end, the gearbox front housing first support arm (1.2) has a gearbox front housing first mounting hole (1.7) at its end, the gearbox front housing second support arm (1.3) has a gearbox front housing second mounting hole (1.8) at its end, the shift flexible shaft support arm (1.4) has a shift flexible shaft fixing hole (1.9) at its end, and the gear selection flexible shaft support arm (1.5) has a gear selection flexible shaft fixing hole (1.10) at its end. The gearbox middle housing mounting hole (1.6), the gearbox front housing first mounting hole (1.7), and the gearbox front housing second mounting hole (1.8) together constitute a three-point support statically determinate structure in space.

2. The gear shifting flexible shaft support based on topology optimization according to claim 1, characterized in that: The lower ends of the gearbox housing support arm (1.1) and the gearbox front housing first support arm (1.2) are connected to form a V-shaped structure, and the included angle α between the two is 70°-100°.

3. The gear shifting flexible shaft support based on topology optimization according to claim 2, characterized in that: The angle β between the lower end of the side wall of the first support arm (1.2) of the front housing of the gearbox and the plane containing the second support arm (1.3) of the front housing of the gearbox is 30°-50°.

4. A topology-optimized gear shifting flexible shaft support according to claim 3, characterized in that: The end of the second support arm (1.3) of the front housing of the gearbox starts from the lower end connection of the V-shaped gearbox middle housing support arm (1.1) and the first support arm (1.2) of the front housing of the gearbox. The second support arm (1.3) of the front housing of the gearbox is inclined towards the first support arm (1.2) of the front housing of the gearbox in the plane. The angle γ between the end of the side wall of the second support arm (1.3) of the front housing of the gearbox on the same side as the first support arm (1.2) of the gearbox and the plane where the first support arm (1.2) of the gearbox is located is 40°-70°.

5. A topology-optimized gear shifting flexible shaft support according to claim 4, characterized in that: The second support arm (1.3) of the front housing of the gearbox is a wedge-shaped structure that is narrow at the front and wide at the rear. The included angle δ between the two side walls at the front end of the second support arm (1.3) of the front housing of the gearbox is 5°-20°.

6. A topology-optimized gear shifting flexible shaft support according to claim 5, characterized in that: The second mounting hole (1.8) on the front housing of the gearbox and the fixing hole (1.9) on the shift cable are both located near the geometric center of the triangular support area formed by the three mounting points: the mounting hole (1.6) on the middle housing of the gearbox, the first mounting hole (1.7) on the front housing of the gearbox, and the second mounting hole (1.8) on the front housing of the gearbox.

7. A topology-optimized gear shifting flexible shaft support according to claim 6, characterized in that: The material of the bracket body (1) is ZL101A.

8. A gear shifting system, characterized in that: The gearbox includes a shift flexible shaft (2), a selector flexible shaft (3), and a gearbox housing (4), and also includes a topology-optimized selector / shift flexible shaft bracket as described in any one of claims 1-7. The shift flexible shaft (2) and the selector flexible shaft (3) are respectively fixed by screwing the base into the shift flexible shaft fixing hole (1.9) of the aligned shift flexible shaft support arm (1.4) and the selector flexible shaft fixing hole (1.10) of the selector flexible shaft support arm (1.5). The gearbox middle housing mounting hole (1.6) is screwed into the middle of the upper end wall of the gearbox housing (4), the gearbox front housing first mounting hole (1.7) is screwed into the front part of the upper end wall of the gearbox housing (4), and the gearbox front housing second mounting hole (1.8) is screwed into the front part of the side wall of the gearbox housing (4).

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