A front subframe for a passenger vehicle and its processing method

Abstract

This invention discloses a front subframe for passenger vehicles, relating to the field of automotive parts technology. It includes a front subframe frame body, with fixed ends integrally formed at both corners. Each of the two fixed ends has a fixing opening, and a fixed shaft and a fixing sleeve are placed inside each fixing opening. The fixing sleeve is used for rotatable connection to the inner wall of the fixing opening. This invention utilizes the two sharp corners of a limiting block to restrict the position of the first and second limiting teeth of the fixed shaft, ensuring a small range of rotation of the fixed shaft within the fixed end. When the fixed shaft is subjected to high torque, the spring plate deforms, thus preventing damage to the limiting block or fixing sleeve. After the torque is removed, the fixed shaft can be limited again. A first rack can further limit the fixing sleeve, making the limiting more secure and allowing the first rack to quickly enter the pre-reserved groove, preventing interference.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, specifically to a front subframe for a passenger vehicle and its processing method. Background Technology

[0002] With the rapid development of the automotive industry, passenger vehicles have increasingly higher requirements in terms of performance, safety, and comfort. As an important component of automobiles, the front subframe must not only ensure vehicle driving stability and ride comfort, but also meet the requirements of lightweight, high strength, and high rigidity. The front subframe is a key component connecting the vehicle body with the front and rear axles and suspension system, and undertakes the important tasks of supporting the front axle load, transmitting power, and reducing vibration and noise.

[0003] In existing technologies, the front subframe is connected to some fixed axles using key connections or integral welding. When the fixed axle rotates slightly relative to the fixed end, a limiting structure is needed to restrict the fixed axle to prevent large rotation. When the fixed axle is subjected to large torque, it may be damaged or the fixed end may be deformed. Therefore, it is necessary to limit the rotation angle of the fixed axle. Furthermore, if the torque of the fixed axle exceeds a certain value, a protective structure needs to be added to prevent large rotation. Otherwise, damage to the fixed axle would be quite dangerous. Summary of the Invention

[0004] The purpose of this invention is to provide a front subframe for a passenger vehicle and a processing method thereon, so as to solve the problems mentioned in the background art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A front subframe for a passenger vehicle includes a front subframe body. Fixed ends are integrally formed at two corners of the front subframe body. Each of the two fixed ends has a fixing opening, and a fixing shaft and a fixing sleeve are placed inside each fixing opening. The fixing sleeve is rotatably connected to the inner wall of the fixing opening and is located outside the fixing shaft. A fixing block is inserted into the side wall of the fixing shaft, and a clamping groove is formed in the inner wall of the fixing sleeve. The fixing block of the fixing shaft matches the clamping groove of the fixing sleeve. Limiting structures are provided inside the two fixed ends and on the side walls of the fixing openings. The limiting structures include several first... The device includes a limiting tooth and several second limiting teeth. Both the first and second limiting teeth are located on the side wall of the fixing sleeve, and the first and second limiting teeth are wedge-shaped and facing each other. A guide strip is inserted into the end of the front subframe body and on the inner wall of the fixing opening. A limiting block is sleeved on the outside of the guide strip. One of the corner tips of the limiting block contacts the fixing sleeve. The tip of the limiting block is used to restrict the rotation of the fixing sleeve within a certain range. A spring plate is provided at the end of the front subframe body and at the limiting block. The spring plate contacts the limiting block and is used to prevent the limiting block from being damaged when the fixing sleeve exceeds the rotation range.

[0007] As a preferred embodiment of the present invention, the two corner tips of the limiting block correspond to the first limiting tooth and the second limiting tooth respectively, and the two corner tips of the limiting block are engaged with the first limiting tooth or the second limiting tooth respectively. The limiting block has a first mating groove inside, the guide strip is arc-shaped, and the first mating groove of the limiting block is movably connected to the guide strip.

[0008] In a preferred embodiment of the present invention, the end face of the limiting block and the end face of the spring sheet are arc-shaped, and the end face of the limiting block and the end face of the spring sheet are slidably connected.

[0009] As a preferred technical solution of the present invention, a first telescopic spring is connected in the middle of the spring sheet, and a stepped groove is opened in the middle of the surface of the spring sheet. A fixing bolt is connected to the inside of the stepped groove and the end face of the limiting block. The fixing bolt is movably connected to the spring sheet, and the end of the fixing bolt floats inside the stepped groove.

[0010] As a preferred technical solution of the present invention, each of the limiting blocks is provided with a floating structure inside. The floating structure includes a fixing groove, which is opened inside the limiting block. A fixing block is fixedly installed inside the fixing opening and located inside the fixing groove. The inside of the fixing groove and the cross-section of the fixing block are both L-shaped. A second mating groove is opened inside the fixing block. A guide strip passes through the inside of the second mating groove. A second telescopic spring and a third telescopic spring are sleeved on the outside of the guide strip and at both ends of the fixing block.

[0011] In a preferred embodiment of the present invention, the second mating groove of the fixing block is movably connected to the guide strip, the guide strip floats inside the second mating groove, and the lower end of the fixing block mates with the lower end of the fixing groove, with the fixing block and the fixing groove floatingly connected inside.

[0012] As a preferred embodiment of the present invention, a clamping structure is provided inside the limiting block and between the fixing block and the fixing sleeve. The clamping structure includes a reserved groove, which is opened inside the limiting block. A gear is rotatably connected inside the reserved groove. A first rack and a second rack are placed inside the reserved groove and on both sides of the gear. The end of the second rack is connected to the side wall of the fixing block by a T-shaped slider. The first rack is located at the gap between the first limiting tooth and the second limiting tooth. The first rack and the second rack are close to or far from each other.

[0013] As a preferred embodiment of the present invention, the internal height of the reserved groove, the tooth width of the first rack, and the tooth width of the second rack are adapted to each other, and both the first rack and the second rack are slidably connected to the inside of the reserved groove.

[0014] A method for machining a front subframe of a passenger vehicle includes the following steps:

[0015] S1. Preliminary preparation work: Read and understand the design drawings according to the relevant technical requirements, select appropriate materials according to the drawing requirements, and conduct necessary material inspections to ensure that the material quality meets the standards;

[0016] S2. Blanking and cutting: Cut the raw material into blanks of the required shape and size, and perform secondary cutting on the blanks to ensure their dimensional accuracy.

[0017] S3. Forming process: According to the design requirements of the subframe, the cut blanks are bent. For parts that need to be stretched, stretching dies are used on a press to ensure the shape and dimensional accuracy after stretching, ensure the dimensions of the fixed end and the fixed opening are accurate, and ensure the proper fit between the fixed sleeve and the fixed shaft.

[0018] S4. Welding: Based on the structural characteristics of the subframe, appropriate welding methods are adopted. After welding is completed, visual inspection and radiographic testing are carried out to ensure that the welded parts are free of defects.

[0019] S5. Machining: Machining the flat parts of the subframe, machining the holes on the subframe according to the drawing requirements, reserving space for the assembly of the limiting structure, floating structure and clamping structure components when machining the fixed end and the fixed sleeve, and machining the shape of the first limiting tooth and the second limiting tooth.

[0020] S6. Heat treatment and surface treatment: Heat treatment is carried out according to the material performance requirements of the subframe to improve its mechanical properties. Surface treatments such as electroplating, spraying, and anodizing are carried out according to the usage environment and requirements of the subframe to improve its corrosion resistance, wear resistance and other properties.

[0021] S7. Assembly: Inspect the components on the subframe to ensure their dimensional accuracy and assembly requirements. Assemble the various components of the subframe according to the assembly drawing and process requirements, ensuring assembly quality. Install the limiting structure, floating structure, and clamping structure in the fixing port, ensuring that after assembly, the limiting block floats inside the fixing port, and the fixing block is fixed relative to the fixing port.

[0022] As a preferred embodiment of the present invention, the assembly steps of the limiting structure, floating structure and clamping structure in step S7 are as follows:

[0023] S71. Install the limiting structure and the fixing block together inside the fixing port, and insert the guide strip into the second mating groove and the first mating groove;

[0024] S72. Insert the guide bar into the second and third telescopic springs, fix the fixing block to the inside of the fixing port, and move the second mating groove relative to the fixing block;

[0025] S73. The T-shaped slider at the end of the second rack is connected to the fixed block to ensure that the second rack is located in the gap between the first limiting tooth and the second limiting tooth.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] A limit structure is set up, using the two sharp corners of the limit block to restrict the position of the first and second limit teeth of the fixed shaft, ensuring that the fixed shaft has a small range of rotation inside the fixed end; when the fixed shaft is subjected to a large torque, the spring plate deforms, thereby preventing damage to the limit block or the fixed sleeve; after the torque is removed, the fixed shaft can be limited again.

[0028] The limit block is equipped with a floating structure. When the limit block is subjected to a large load or when the limit block rotates with the fixed sleeve, the inside of the limit block slides relative to the fixed block, so that the limit block can float freely and is reset by the second and third telescopic springs.

[0029] Equipped with a clamping structure, when the limiting block approaches the fixing sleeve, the first rack can extend from the reserved slot, thereby clamping the first limiting tooth and the second limiting tooth of the fixing sleeve. The first rack can further limit the fixing sleeve, making the limiting more reliable.

[0030] The floating structure and the clamping structure work together so that when the fixed shaft is subjected to a large torque, the distance between the gear and the fixed block decreases when the limiting block and the fixed sleeve move away from each other. This allows the first rack to be quickly placed inside the reserved slot, preventing interference with the first rack. Attached Figure Description

[0031] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0032] Figure 1 This is a structural diagram of the main body of the present invention;

[0033] Figure 2 This is a schematic diagram of the interior of the fixed end of the present invention;

[0034] Figure 3 This is a schematic diagram of the limiting structure of the present invention;

[0035] Figure 4 This is a schematic diagram of the spring sheet and fixing bolt of the present invention;

[0036] Figure 5 This is a schematic diagram of the floating structure of the present invention;

[0037] Figure 6 This is a schematic diagram showing the relative motion between the fixed block and the limiting block of the present invention;

[0038] Figure 7 This is a schematic diagram of the clamping structure of the present invention;

[0039] Figure 8 This is a schematic diagram of the gear of the present invention.

[0040] In the diagram: 1. Front subframe frame; 2. Fixed end; 3. Fixed opening; 4. Fixed shaft; 5. Fixed sleeve; 6. Limiting structure; 61. First limiting tooth; 62. Second limiting tooth; 63. Limiting block; 64. Guide strip; 65. First mating groove; 66. Spring sheet; 67. First telescopic spring; 68. Stepped groove; 69. Fixing bolt; 7. Floating structure; 71. Fixed groove; 72. Fixed block; 73. Second mating groove; 74. Second telescopic spring; 75. Third telescopic spring; 8. Clamping structure; 81. Reserved groove; 82. First rack; 83. Gear; 84. Second rack; 9. Fixed block; 10. Clamping groove. Detailed Implementation

[0041] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1:

[0042] Please see Figures 1-4 As shown, a front subframe for a passenger vehicle includes a front subframe body 1. Fixed ends 2 are integrally formed at both corners of the front subframe body 1. Each fixed end 2 has a fixing opening 3 inside, and a fixing shaft 4 and a fixing sleeve 5 are placed inside each fixing opening 3. The fixing sleeve 5 is rotatably connected to the inner wall of the fixing opening 3, and is located outside the fixing shaft 4. When the corners of the front subframe body 1 are connected via the fixing shaft 4, the fixing shaft 4 is prone to significant floating within the fixing opening 3 of the fixed end 2. A fixing block 9 is inserted into the side wall of the fixing shaft 4, and a clamping groove is formed on the inner wall of the fixing sleeve 5. 10. The fixing block 9 of the fixed shaft 4 is adapted to the clamping groove 10 of the fixed sleeve 5. The fixed shaft 4 is placed into the inside of the fixed sleeve 5, so that the fixing block 9 of the fixed shaft 4 is adapted to the clamping groove 10 of the fixed sleeve 5, thereby initially limiting the fixed shaft 4. Limiting structures 6 are provided inside the two fixed ends 2 and on the side wall of the fixed opening 3. The limiting structure 6 includes a plurality of first limiting teeth 61 and a plurality of second limiting teeth 62. The first limiting teeth 61 and the second limiting teeth 62 are both opened on the side wall of the fixed sleeve 5, and the first limiting teeth 61 and the second limiting teeth 62 are wedge-shaped and back-to-back with each other. The wedge-shaped first limiting tooth 61 and second limiting tooth 62 engage with the limiting block 63 to achieve limiting. A guide strip 64 is inserted into the end of the front subframe frame 1 and located on the inner wall of the fixing port 3. A limiting block 63 is sleeved on the outside of the guide strip 64. The limiting block 63 can float relative to the fixed end 2, thereby offsetting along the guide strip 64. One of the corner tips of the limiting block 63 contacts the fixing sleeve 5. The tip of the limiting block 63 is used to limit the rotation of the fixing sleeve 5 within a certain range. When the fixing shaft 4 rotates, it can drive the first limiting tooth 61 and the second limiting tooth 62. When 62 rotates slightly, the tip of the limiting block 63 can engage with the limiting tooth to limit the rotation angle of the fixed shaft 4. A spring plate 66 is provided at the end of the front subframe 1 and at the limiting block 63. The spring plate 66 is in contact with the limiting block 63. The spring plate 66 is used to prevent the limiting block 63 from being damaged when the fixed sleeve 5 exceeds the rotation range. When the torque of the fixed shaft 4 is large, it may cause damage to the fixed sleeve 5 and the limiting block 63. At this time, the two legs of the spring plate 66 are deformed, and after the limiting block 63 rotates, it engages again with the first limiting tooth 61 and the second limiting tooth 62.

[0043] Please see Figure 2 and Figure 3As shown, the two corner tips of the limiting block 63 correspond to the first limiting tooth 61 and the second limiting tooth 62 respectively, and the two corner tips of the limiting block 63 are engaged with the first limiting tooth 61 or the second limiting tooth 62 respectively. The rotation of the fixed sleeve 5 can drive the two tips of the limiting block 63 to engage with the first limiting tooth 61 and the second limiting tooth 62 at different positions, ensuring that the fixed shaft 4 rotates while avoiding the large torsional force of the fixed shaft 4 that could damage the limiting block 63 and the fixed sleeve 5. The limiting block 63 has a first mating groove 65 inside, and the guide strip 64 is arc-shaped. The first mating groove 65 of the limiting block 63 is movably connected to the guide strip 64, ensuring that the limiting block 63 can move on the guide strip 64, and that the guide strip 64 will not interfere when the limiting block 63 floats.

[0044] Please see Figure 3 and Figure 4 As shown, the end face of the limiting block 63 and the end face of the spring plate 66 are arc-shaped. The end face of the limiting block 63 and the end face of the spring plate 66 are slidably connected to ensure that the limiting block 63 and the spring plate 66 are smoothly connected, and the relative movement of the limiting block 63 and the spring plate 66 will not be affected.

[0045] Please see Figure 4 and Figure 5 As shown, a first telescopic spring 67 is connected in the middle of the spring sheet 66, and a stepped groove 68 is formed in the middle of the surface of the spring sheet 66. A fixing bolt 69 is connected to the inside of the stepped groove 68 and the end face of the limiting block 63. The fixing bolt 69 is movably connected to the spring sheet 66, and the end of the fixing bolt 69 floats inside the stepped groove 68. When the limiting block 63 slides circumferentially relative to the guide strip 64, both the spring sheet 66 and the first telescopic spring 67 can undergo appropriate deformation, thereby ensuring that the tip of the limiting block 63 is locked inside the first limiting tooth 61 and the second limiting tooth 62. When the spring sheet 66 and the limiting block 63 slide relative to each other, the fixing bolt 69 can ensure that the spring sheet 66 and the limiting block 63 are connected.

[0046] Please see Figure 2 , Figures 5-6As shown, each limiting block 63 has a floating structure 7 inside. The floating structure 7 includes a fixing groove 71, which is opened inside the limiting block 63. A fixing block 72 is fixedly installed inside the fixing port 3 and inside the fixing groove 71. The interior of the fixing groove 71 and the cross-section of the fixing block 72 are both L-shaped. When the limiting block 63 rotates circumferentially around the axis of the fixing shaft 4 or moves radially, it can ensure that the fixing groove 71 of the limiting block 63 cooperates with the fixing block 72, so as to avoid excessive movement and floating of the limiting block 63. A second mating groove 73 is opened inside the fixing block 72. A guide strip 64 passes through the interior of the second mating groove 73. When the limiting block 63 floats along the guide strip 64, it ensures that the guide strip 64 can float inside the second mating groove 73. A second telescopic spring 74 and a third telescopic spring 75 are sleeved on the outside of the guide strip 64 and at both ends of the fixing block 72. The second telescopic spring 74 and the third telescopic spring 75 are used to reset the limiting block 63.

[0047] Please see Figure 6 As shown, the second mating groove 73 of the fixing block 72 is movably connected to the guide bar 64. The guide bar 64 floats inside the second mating groove 73, and the lower end of the fixing block 72 mates with the lower end of the fixing groove 71. The fixing block 72 is floated inside the fixing groove 71. The directions in which the fixing block 72 floats relative to the limiting block 63 are circumferentially around the fixing axis 4 and radially closer to and away from the fixing axis 4.

[0048] Please see Figure 2 , Figure 7 and Figure 8As shown, a clamping structure 8 is provided inside the limiting block 63 and between the fixing block 72 and the fixing sleeve 5. The clamping structure 8 includes a reserved groove 81, which is opened inside the limiting block 63. A gear 83 is rotatably connected inside the reserved groove 81. The gear 83 can rotate inside the reserved groove 81. A first rack 82 and a second rack 84 are placed inside the reserved groove 81 and on both sides of the gear 83. The end of the second rack 84 is connected to the side wall of the fixing block 72 by a T-shaped slider. When the fixing block 72 slides circumferentially relative to the limiting block 63, the second rack 84 and the fixing block 72 can be connected by the T-shaped slider to prevent the fixing block 72 and the second telescopic spring 74 from disengaging. The first rack 82 is located at the gap between the first limiting tooth 61 and the second limiting tooth 62. The first rack 82 and the second rack 84 move closer or further apart. When the limiting block 63 moves radially relative to the fixed block 72, the distance between the fixed block 72 and the gear 83 changes. At this time, the second rack 84 can drive the gear 83 to rotate, and the gear 83 can also drive the second rack 84 to move. Thus, when the fixed shaft 4 is subjected to a large torque, not only can the limiting block 63 move away from the two sets of limiting teeth, but the first rack 82 can also be moved away from the two sets of limiting teeth to avoid interference with the limiting teeth. When the limiting block 63 is reset under the action of the telescopic spring and the spring plate 66, the fixed block 72 and the gear 83 move away from each other. Thus, after the first rack 82 extends, it is locked in the gap between the first limiting tooth 61 and the second limiting tooth 62, which can better restrict the rotation of the fixed shaft 4 and the fixed sleeve 5.

[0049] Please refer to Figure 8. The internal height of the reserved groove 81, the tooth width of the first rack 82, and the tooth width of the second rack 84 are matched. The first rack 82 and the second rack 84 are both slidably connected to the inside of the reserved groove 81. The cross-sectional shape of the reserved groove 81 is H-shaped, ensuring that the first rack 82 and the second rack 84 can slide inside the H-shaped reserved groove 81 without deflection.

[0050] A method for machining a front subframe of a passenger vehicle includes the following steps:

[0051] S1. Preliminary preparation work: Read and understand the design drawings according to the relevant technical requirements, select appropriate materials according to the drawing requirements, and conduct necessary material inspections to ensure that the material quality meets the standards;

[0052] S2. Blanking and cutting: Cut the raw material into blanks of the required shape and size, and perform secondary cutting on the blanks to ensure their dimensional accuracy.

[0053] S3. Forming process: According to the design requirements of the subframe, the cut blanks are bent. For parts that need to be stretched, stretching dies are used on a press to ensure the shape and dimensional accuracy after stretching, to ensure the dimensions of the fixed end 2 and the fixed opening 3 are accurate, and the fit between the fixed sleeve 5 and the fixed shaft 4 is appropriate.

[0054] S4. Welding: Based on the structural characteristics of the subframe, appropriate welding methods are adopted. After welding is completed, visual inspection and radiographic testing are carried out to ensure that the welded parts are free of defects.

[0055] S5. Machining: Machining the flat parts of the subframe, machining the holes on the subframe according to the drawing requirements, reserving space for the assembly of the limiting structure 6, floating structure 7 and clamping structure 8 when machining the fixed end 2 and the fixed sleeve 5, and machining the shape of the first limiting tooth 61 and the second limiting tooth 62.

[0056] S6. Heat treatment and surface treatment: Heat treatment is carried out according to the material performance requirements of the subframe to improve its mechanical properties. Surface treatments such as electroplating, spraying, and anodizing are carried out according to the usage environment and requirements of the subframe to improve its corrosion resistance, wear resistance and other properties.

[0057] S7. Assembly: Inspect the components on the subframe to ensure their dimensional accuracy and assembly requirements. Assemble the various components of the subframe according to the assembly drawing and process requirements to ensure assembly quality. Install the limiting structure 6, floating structure 7, and clamping structure 8 in the fixing port 3 to ensure that after assembly, the limiting block 63 floats inside the fixing port 3 and the fixing block 72 is fixed relative to the fixing port 3.

[0058] Please see Figures 1-3 As shown, the assembly steps for the limiting structure 6, floating structure 7, and clamping structure 8 in S7 are as follows:

[0059] S71. Install the limiting structure 6 and the fixing block 72 together inside the fixing port 3, and insert the guide strip 64 into the second mating groove 73 and the first mating groove 65 to avoid the inability to put the fixing block 72 into the fixing groove 71 later.

[0060] S72. Insert the guide bar 64 into the second telescopic spring 74 and the third telescopic spring 75. Fix the fixing block 72 to the inside of the fixing port 3. Move the second mating groove 73 relative to the fixing block 72. The fixing block 72 can move radially along the fixing shaft 4 and rotate circumferentially along the fixing shaft 4.

[0061] S73, the T-shaped slider at the end of the second rack 84 is connected to the fixing block 72 to ensure that the second rack 84 is located in the gap between the first limiting tooth 61 and the second limiting tooth 62, and the circumferential rotation of the fixing block 72 will not affect the meshing of the first rack 82 and the gear 83.

[0062] It should be noted that the fixed shaft 4 and the fixed sleeve 5 are installed inside the fixed end 2. The fixing block 9 of the fixed shaft 4 cooperates with the clamping groove 10 of the fixed sleeve 5, so that the rotation of the fixed shaft 4 can drive the fixed sleeve 5 to rotate. During this period, the rotation range of the fixed shaft 4 can be limited by the limiting structure 6. Specifically, when the fixed sleeve 5 and the fixed shaft 4 rotate at a large angle, the two ends of the limiting block 63 can clamp the first limiting tooth 61 and the second limiting tooth 62 to prevent the fixed shaft 4 and the fixed sleeve 5 from continuing to rotate. If the fixed shaft 4 is subjected to a large torque, the spring plate 66 will deform, and the limiting block 63 will move away from the fixed sleeve 5. The two ends of the limiting block 63 will disengage from the first limiting tooth 61 and the second limiting tooth 62. Under the action of the spring plate 66 and the first telescopic spring 67, the limiting block 63 can be reset, so that the two ends of the limiting block 63 can be clamped with the first limiting tooth 61 and the second limiting tooth 62 again, and the fixed shaft 4 and the fixed sleeve 5 can be limited again.

[0063] When the fixed shaft 4 is subjected to a large torque, the limiting block 63 moves away from the fixed sleeve 5. The fixing groove 71 of the limiting block 63 cooperates with the fixed block 72. The shape of the fixing groove 71 can limit the rotation or movement of the limiting block 63. The guide bar 64 can float in the first mating groove 65 and the second mating groove 73. Under the action of the second telescopic spring 74 and the third telescopic spring 75, the fixed block 72 can be reset to the middle of the fixing groove 71. Thus, when the fixed shaft 4 rotates slightly, it can engage with different first limiting teeth 61 and second limiting teeth 62.

[0064] When the fixed shaft 4 is subjected to a large torque, the limiting block 63 moves away from the fixed sleeve 5. At this time, the gear 83 and the fixed block 72 become closer. The second rack 84 drives the gear 83 to rotate, and the gear 83 drives the first rack 82 to move. As a result, the first rack 82 also moves away from the fixed sleeve 5. At this time, both the limiting block 63 and the gear 83 move away from the first limiting tooth 61 and the second limiting tooth 62. The fixed shaft 4 can rotate. After the torque is removed, the limiting block 63 is reset by the action of the spring plate 66, the first telescopic spring 67, the second telescopic spring 74, and the third telescopic spring 75. As a result, the gear 83 meshes with the second rack 84. The gear 83 drives the first rack 82 to extend. The first rack 82 can lock the first limiting tooth 61 and the second limiting tooth 62 again.

[0065] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A passenger car front subframe, comprising a front subframe frame body (1), two corners of the front subframe frame body (1) are integrally provided with fixed ends (2), the interiors of the two fixed ends (2) are each provided with a fixed opening (3), and the interiors of the two fixed openings (3) are each placed with a fixed shaft (4) and a fixed sleeve (5), the fixed sleeve (5) is rotationally connected with the inner wall of the fixed opening (3), and the fixed sleeve (5) is located outside the fixed shaft (4), characterized in that, The side wall of the fixed shaft (4) is provided with a fixed clamping block (9), the inner wall of the fixed sleeve (5) is provided with a clamping groove (10), the fixed clamping block (9) of the fixed shaft (4) is matched with the clamping groove (10) of the fixed sleeve (5), the inside of the two fixed ends (2) and the side wall of the fixed port (3) are provided with a limiting structure (6), the limiting structure (6) comprises a plurality of first limiting teeth (61) and a plurality of second limiting teeth (62), the first limiting teeth (61) and the second limiting teeth (62) are provided on the side wall of the fixed sleeve (5), and the first limiting teeth (61) and the second limiting teeth (62) are wedge-shaped and opposite to each other, the end of the front subframe body (1) and the inner wall of the fixed port (3) are provided with a guide strip (64), the outer part of the guide strip (64) is provided with a limiting block (63), one corner tip of the limiting block (63) is in contact with the fixed sleeve (5), the tip of the limiting block (63) is used for limiting the rotation of the fixed sleeve (5) within a certain range, the end of the front subframe body (1) and the limiting block (63) are provided with a spring sheet (66), the spring sheet (66) is in contact with the limiting block (63), and the spring sheet (66) is used to avoid damage to the limiting block (63) when the fixed sleeve (5) exceeds the rotation range; The two corner tips of the limiting block (63) correspond to the first limiting teeth (61) and the second limiting teeth (62) respectively, and the two corner tips of the limiting block (63) are clamped with the first limiting teeth (61) or the second limiting teeth (62) respectively, the inside of the limiting block (63) is provided with a first matching groove (65), the shape of the guide strip (64) is arc-shaped, and the first matching groove (65) of the limiting block (63) is movably connected with the guide strip (64). The end surface of the limiting block (63) and the end surface of the spring sheet (66) are arc-shaped, and the end surface of the limiting block (63) is slidably connected with the end surface of the spring sheet (66).

2. The front subframe for a passenger vehicle according to claim 1, characterized by The middle of the spring sheet (66) is connected with a first telescopic spring (67), a stepped groove (68) is formed in the surface of the spring sheet (66), a fixed bolt (69) is connected between the inside of the stepped groove (68) and the end surface of the limiting block (63), the fixed bolt (69) is movably connected with the spring sheet (66), and the end of the fixed bolt (69) is floatingly arranged in the stepped groove (68).

3. The front subframe of claim 2, wherein The inside of each limiting block (63) is provided with a floating structure (7), the floating structure (7) comprises a fixed groove (71), the fixed groove (71) is formed in the inside of the limiting block (63), a fixed block (72) is fixedly installed in the inside of the fixed port (3) and located in the inside of the fixed groove (71), the inside of the fixed groove (71) and the cross section of the fixed block (72) are L-shaped, a second matching groove (73) is formed in the inside of the fixed block (72), the guide strip (64) penetrates through the inside of the second matching groove (73), and the outside of the guide strip (64) and the two ends of the fixed block (72) are sleeved with a second telescopic spring (74) and a third telescopic spring (75).

4. The front subframe of claim 3, wherein The second matching groove (73) of the fixed block (72) is movably connected with the guide strip (64), the guide strip (64) is internally floated in the second matching groove (73), and the lower end of the fixed block (72) is matched with the lower end of the fixed groove (71), and the fixed block (72) is internally and floatingly connected with the fixed groove (71).

5. The front subframe of claim 4, wherein The inside of the limiting block (63) and between the fixed block (72) and the fixed sleeve (5) is provided with a clamping structure (8), the clamping structure (8) comprises a reserved groove (81), the reserved groove (81) is arranged in the inside of the limiting block (63), and the inside of the reserved groove (81) is rotatably connected with a gear (83), the inside of the reserved groove (81) and on both sides of the gear (83) are provided with a first rack (82) and a second rack (84), and the end of the second rack (84) is connected with the side wall of the fixed block (72) in a T-shaped sliding block manner, the first rack (82) is located at the gap between the first limiting tooth (61) and the second limiting tooth (62), and the first rack (82) and the second rack (84) are close to or away from each other.

6. The front subframe of claim 5, wherein The inside height of the reserved groove (81), the tooth width of the first rack (82) and the tooth width of the second rack (84) are matched, and the first rack (82) and the second rack (84) are slidingly connected with the inside of the reserved groove (81).

7. A method of manufacturing the front subframe of the passenger car according to claim 6, characterized by, The method comprises the following steps: S1, preliminary preparation, read and understand the design drawing according to the relevant technical requirements, select appropriate materials according to the drawing requirements, and carry out necessary material inspection to ensure that the material quality meets the standard; S2, cutting, cutting the raw material into a blank of the required shape and size, and performing secondary cutting on the cut blank to ensure its dimensional accuracy; S3, forming processing, according to the design requirements of the subframe, the cut blank is bent, for the parts that need to be stretched, the stretching die is used on the press to ensure the shape and dimensional accuracy after stretching, the size accuracy of the fixed end (2) and the fixed port (3), and the cooperation relationship between the fixed sleeve (5) and the fixed shaft (4) is appropriate; S4, welding, according to the structure characteristics of the subframe, using appropriate welding method, after welding, appearance inspection and radiographic inspection are carried out to ensure that there is no defect in the welding part; S5, machining, machining the plane part of the subframe, machining the hole on the subframe according to the drawing requirements, reserving the space of the assembly limiting structure (6), the floating structure (7) and the clamping structure (8) parts when machining the fixed end (2) and the fixed sleeve (5), and machining the shape of the first limiting tooth (61) and the second limiting tooth (62); S6, heat treatment and surface treatment, according to the material performance requirements of the subframe, heat treatment process is carried out to improve its mechanical properties, according to the use environment and requirements of the subframe, electroplating, spraying and anodic oxidation surface treatment are carried out to improve its corrosion resistance and wear resistance; S7, assembly, check the parts on the subframe, ensure its dimensional accuracy and assembly requirements, according to the assembly drawing and process requirements, the various parts of the subframe are assembled together, ensure the assembly quality, the limiting structure (6), floating structure (7) and clamping structure (8) are installed in the fixed mouth (3), ensure that the limiting block (63) is located inside the fixed mouth (3) after assembly, the fixed block (72) is relatively fixed with the fixed mouth (3).

8. The method of claim 7, wherein the front subframe is a passenger car front subframe. The S7 will limit structure (6), floating structure (7) and clamping structure (8) assembly steps as follows: S71, the limiting structure (6) and fixed block (72) are installed in the fixed mouth (3), the guide bar (64) is inserted into the second matching groove (73) and the first matching groove (65); S72, the guide bar (64) is inserted into the second expansion spring (74) and the third expansion spring (75), the fixed block (72) is fixed with the inside of the fixed mouth (3), the second matching groove (73) moves relative to the fixed block (72); S73, the T-shaped slider at the end of the second rack (84) is connected with the fixed block (72), ensuring that the second rack (84) is located at the gap position between the first limiting tooth (61) and the second limiting tooth (62).

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