A lower swing arm assembly for a vehicle

Abstract

The application relates to the field of automobile parts, and discloses a lower swing arm assembly of an automobile, which comprises a swing arm frame, sleeves and mounting parts fixedly connected to the two sides of the swing arm frame, a ball head assembly interference-fitted in the interior of the sleeve, a bushing assembly connected with a vehicle frame interference-fitted in the interior of the mounting part, and a steering knuckle connected with a wheel hub fixedly installed at the top of the ball head assembly. The ball head assembly comprises a ball head piece, a hydraulic part arranged outside the ball head piece, a fixing cylinder fixed outside the hydraulic part, and a reversing positioning piece arranged outside the ball head piece. The hydraulic part arranged in the ball head assembly enables the buffer structure at the ball head piece to adaptively switch the damping characteristics according to different vibration conditions, meets different buffer requirements of low-frequency large-amplitude and high-frequency small-amplitude, effectively reduces the impact and wear between the ball head piece and the hydraulic part, reduces the abnormal sound caused by the gap generated by the wear, and improves the stability of the lower swing arm assembly.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, specifically to a lower control arm assembly for automobiles. Background Technology

[0002] The lower control arm assembly is a key load-bearing and guiding component in the automotive suspension system. One end of it is connected to the vehicle frame via a bushing, and the other end is connected to the steering knuckle and wheel hub via a ball joint assembly. It is used to transmit the force between the wheel and the vehicle body and to ensure that the wheel moves along a certain trajectory. Currently, the ball joint assembly in the lower control arm assembly usually adopts a structure in which a metal ball joint pin and a ball joint seat are engaged. The end of the ball joint pin shaft is fixed to the steering knuckle by a nut, and the ball joint body is rotatably set in the ball joint seat.

[0003] To buffer the impact and wear between the ball joint and the ball joint seat, the existing technology uses a rubber liner between the ball joint and the ball joint seat. However, the damping characteristics of the rubber liner are determined by its material itself, and its stiffness and damping values ​​are fixed. When the vehicle is traveling under different road conditions, the rubber liner cannot adaptively adjust its damping characteristics according to the changes in vibration frequency and amplitude.

[0004] Under low-frequency, high-amplitude potholes or turning conditions, rubber pads are easily crushed instantly. Under high-frequency, low-amplitude, fine bumpy road conditions, the rubber pads are too stiff to effectively filter vibrations. As a result, the contact surface between the ball joint and the rubber pad is always subjected to a large alternating load, which accelerates the wear of the ball joint and the rubber pad.

[0005] When the ball joint and rubber bushing wear to a certain extent, the internal gap of the ball joint assembly increases, which not only produces abnormal noise, but also directly affects the wheel alignment accuracy and handling stability. At the same time, the wear of the ball joint is concentrated in the frequently used contact area. When this area wears to a certain extent, the entire ball joint assembly needs to be replaced, thus affecting the service life of the ball joint assembly. Therefore, it is necessary to propose a lower control arm assembly for automobiles to solve the above problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a lower control arm assembly for automobiles, which solves the problems of easy mutual wear between the ball joint and the rubber bushing, and the impact of wear on the commonly used fixed surface of the ball joint on its service life.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a lower control arm assembly for automobiles, including a control arm frame, a sleeve and a mounting part are respectively fixedly connected to both sides of the control arm frame, a ball joint assembly is interference-fitted inside the sleeve, a bushing assembly connected to the vehicle frame is interference-fitted inside the mounting part, and a steering knuckle connected to the wheel hub is fixedly mounted on the top of the ball joint assembly.

[0008] The ball joint assembly includes a ball joint, a hydraulic component disposed outside the ball joint, a fixed cylinder fixed outside the hydraulic component, and a reversing positioning component installed on the outside of the ball joint.

[0009] The hydraulic component includes a rubber main spring, a hydraulic chamber located outside the rubber main spring, and multiple flow channels located between the hydraulic chambers, as well as hydraulic fluid filling the hydraulic chambers and flow channels.

[0010] The reversing positioning component includes a positioning piece fixed to the bottom of the steering knuckle and a positioning block fixed to the outside of the ball joint, with the positioning block engaging inside the positioning piece.

[0011] The ball joint is rotatably disposed inside the hydraulic component. When the ball joint rotates, it squeezes the hydraulic chamber. The hydraulic chambers are connected to each other through the flow channel. The positioning block can be changed at different angles and then engaged in the positioning piece.

[0012] Preferably, the ball joint includes a shaft and a ball body;

[0013] The rubber main spring has a ball groove at the top center. The top of the ball groove is cylindrical and the bottom is spherical. The ball head is rotatably disposed inside the spherical structure of the ball groove. The shaft is fixedly connected to the top of the ball head. The top of the shaft is provided with an external thread, and a nut is threaded onto the external thread.

[0014] Preferably, the reversing positioning component further includes a positioning groove and a retaining ring;

[0015] The fixing ring is fixedly connected to the outer wall of the shaft, and the positioning block is symmetrically fixedly connected to the outer wall of the fixing ring. The positioning groove is opened at the same angle inside the positioning piece. The shaft is slidably disposed inside the positioning piece and the bottom mounting angle of the steering knuckle. The fixing ring and the nut respectively abut against both sides of the bottom mounting angle of the steering knuckle.

[0016] Preferably, the hydraulic component further includes a quick-pass flow channel, a decoupling component, and a main flow channel;

[0017] The flow channels are a fast-flow flow channel and a main flow channel;

[0018] The two hydraulic chambers are symmetrically opened on both sides of the rubber main spring, and the two quick-pass flow channels and two main flow channels are opened on the outside of the rubber main spring and are connected between the two hydraulic chambers. The decoupling element is located inside one side of the quick-pass flow channel and is used to control the closing of the quick-pass flow channel.

[0019] The fast-flow channel is an arc-shaped direct current channel, and the main current channel is a wavy curved channel, with the cross-sectional width of the fast-flow channel being greater than that of the main current channel.

[0020] Preferably, the decoupling component includes a stepped hole, a side flow channel, a fixing plate, a limiting post, and a decoupling membrane;

[0021] The stepped hole is opened inside the rubber main spring and connects the hydraulic chamber and the quick-pass flow channel. The side flow groove is symmetrically opened at the narrow part of the stepped hole and is connected to the quick-pass flow channel. The fixing piece is fixedly connected to the inner wall at the wide part of the stepped hole.

[0022] The fixing plate has symmetrically symmetrically perforated flow holes inside, the decoupling membrane is sealed and fitted to one side of the fixing plate, and the limiting post is fixedly connected to one side of the middle part of the fixing plate.

[0023] Preferably, a movable ring is installed at the center of the decoupling membrane, and the movable ring is slidably disposed on the outer wall of the limiting post. A baffle is extended at one end of the limiting post. A sliding ring is fixedly connected to the outer wall of the decoupling membrane, and the sliding ring is slidably disposed at the narrow part of the stepped hole.

[0024] When the moving ring of the decoupling membrane slides to the baffle of the limiting post, the hydraulic fluid inside the hydraulic chamber flows into the fast-flow channel from the stepped hole through the side flow groove.

[0025] Preferably, the top of the fixed cylinder is equipped with an installation component, which includes an installation block, a cover plate, a dust cover, a sealing ring one, and a sealing ring two;

[0026] The mounting block is interference-fitted into the inner side of the cylindrical structure of the ball groove, and the bottom of the mounting block is provided with a hemispherical groove corresponding to the ball head, and the middle part of the mounting block is provided with a matching mounting hole corresponding to the shaft, so that the mounting block is sleeved on the outside of the shaft.

[0027] The cover plate abuts against the top of the mounting block, and the bottom edge of the cover plate is fixedly connected to the top edge of the fixing cylinder. The dust cover is fixedly connected to the top of the fixing cylinder, and the top of the dust cover abuts against the bottom of the fixing ring and is rotatably disposed outside the shaft.

[0028] Preferably, the first sealing ring is fixedly connected to the top outer wall of the rubber main spring, and the second sealing ring is fixedly connected to the bottom outer wall of the rubber main spring.

[0029] The fixed cylinder is interference-fitted to the outside of the first sealing ring and the inside of the second sealing ring, and the inner wall of the fixed cylinder is fitted to the outer wall of the rubber main spring, so that the hydraulic chamber and the flow channel form a sealed space. The fixed cylinder is interference-fitted to the inside of the sleeve.

[0030] Preferably, the bushing assembly includes a screw, an inner cylinder, a hydraulic bushing, an outer cylinder, a first sealing ring, and a second sealing ring;

[0031] Both ends of the screw are provided with external threads, and nuts are installed at the external threads. The screw is fixedly connected to the inner wall of the inner cylinder. The hydraulic bushing is installed on the outside of the inner cylinder. Sealing ring one is fixedly connected to one side of the outer wall of the hydraulic bushing, and sealing ring two is fixedly connected to one side of the hydraulic bushing.

[0032] Preferably, the outer cylinder is interference-fitted to the outside of sealing ring one and sealing ring two, the internal structure of the hydraulic bushing is the same as the internal structure of the hydraulic component, the inner wall of the outer cylinder is fitted to the outer wall of the hydraulic bushing, and the outer cylinder is interference-fitted to the inside of the mounting part.

[0033] Working principle: During vehicle operation, when the wheels pass over bumpy roads, the steering knuckle drives the lower control arm to swing up and down. When the ball joint is subjected to low-frequency, large-amplitude impacts, the pressure change inside the hydraulic chamber is gradual. The hydraulic fluid flows through the main channel in a long, curved passage, generating significant viscous frictional resistance, providing high damping and high stiffness to attenuate large vibrations. When the ball joint is subjected to high-frequency, small-amplitude vibrations, the pressure change inside the hydraulic chamber is rapid. The fluid in the main channel cannot pass through in time due to inertia. At the same time, the high-frequency pressure causes the decoupling component to open, and the hydraulic fluid flows through the quick-pass channel for short-distance local flow, reducing frictional resistance and providing low damping and low stiffness to gently filter out minor vibrations. In addition, after long-term use, the nut at the top of the ball joint shaft can be removed, the ball joint can be pushed downwards to move the positioning block out of the positioning groove, and then the ball joint can be rotated at a certain angle and moved upwards to re-engage the positioning block in the corresponding positioning groove. Finally, the nut can be tightened to replace the commonly worn surface of the ball joint, avoiding excessive clearance caused by long-term wear on one side of the ball joint, which would affect the handling stability.

[0034] This invention provides a lower control arm assembly for automobiles. It offers the following advantages:

[0035] 1. This invention, by setting a hydraulic component inside the ball joint assembly, enables the buffer structure at the ball joint to adaptively switch damping characteristics according to different vibration conditions, meeting different buffering requirements for low-frequency large amplitude and high-frequency small amplitude, effectively reducing impact wear between the ball joint and the hydraulic component, reducing abnormal noise caused by wear-induced gaps, and improving the stability of the lower control arm assembly.

[0036] Meanwhile, by engaging the positioning block located on the outside of the ball joint with the positioning plate fixed at the bottom of the steering knuckle, rotating the ball joint allows the positioning block to be re-engaged in the positioning plate after changing its angle, thereby adjusting the commonly worn surfaces of the ball joint. This extends the service life of the ball joint without replacing the entire ball joint assembly, reducing the maintenance cost of the lower control arm assembly.

[0037] 2. This invention sets the main channel as a wavy curved channel and the quick-pass channel as an arc-shaped direct current channel, with the cross-sectional width of the quick-pass channel being greater than that of the main channel. Combined with the use of decoupling components, this allows the hydraulic fluid to adaptively select different flow paths under different vibration frequencies and amplitudes, simplifying and improving the response speed of the adaptive structure.

[0038] When using the speed-through flow path, the hydraulic components exhibit low damping and low stiffness, which can gently filter high-frequency vibrations and prevent vibrations from being directly transmitted to the steering system, thus improving driving comfort. When using the main flow path, the hydraulic components instantly exhibit high damping and high stiffness, providing strong support to attenuate severe impacts, prevent the chassis from becoming loose, and ensure handling precision. Attached Figure Description

[0039] Figure 1 This is a perspective view of the present invention;

[0040] Figure 2 This is a schematic diagram of the working state of the ball head assembly of the present invention;

[0041] Figure 3 This is a schematic diagram of the reversing positioning component of the present invention;

[0042] Figure 4 This is a side sectional view of the ball joint assembly of the present invention;

[0043] Figure 5 This is a side sectional view of the bushing assembly of the present invention;

[0044] Figure 6 This is a schematic diagram of the internal structure of the hydraulic component of the present invention;

[0045] Figure 7 This is a schematic diagram of the structure of the hydraulic component of the present invention;

[0046] Figure 8 This is a schematic diagram of the disassembled structure of the ball head assembly of the present invention;

[0047] Figure 9 This is a schematic diagram of the structure of the ball groove of the present invention;

[0048] Figure 10 This is a schematic diagram of the internal structure of the bushing assembly of the present invention;

[0049] Figure 11 For the present invention Figure 3 Enlarged diagram of point A in the diagram;

[0050] Figure 12 For the present invention Figure 7 Enlarged diagram of point A in the diagram;

[0051] Figure 13 For the present invention Figure 9 Enlarged diagram of point A in the diagram.

[0052] The components include: 1. Swing arm; 2. Sleeve; 3. Ball joint assembly; 31. Ball joint piece; 311. Shaft; 312. Ball joint body; 32. Hydraulic components; 321. Rubber main spring; 322. Hydraulic chamber; 323. Quick-flow channel; 324. Decoupling component; 3241. Stepped hole; 3242. Side flow channel; 3243. Fixing plate; 3244. Limiting post; 3245. Decoupling membrane; 325. Main flow channel; 33. Fixing cylinder; 34. Reversing mechanism. Positioning components; 341, positioning piece; 342, positioning groove; 343, retaining ring; 344, positioning block; 35, mounting components; 351, mounting block; 352, cover plate; 353, dust cover; 354, sealing ring one; 355, sealing ring two; 36, ball groove; 4, steering knuckle; 5, mounting part; 6, bushing assembly; 61, screw; 62, inner cylinder; 63, hydraulic bushing; 64, outer cylinder; 65, sealing ring one; 66, sealing ring two. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0054] Please see the appendix Figure 1-13 This invention provides a lower control arm assembly for an automobile, including a control arm frame 1. A sleeve 2 and a mounting part 5 are fixedly connected to both sides of the control arm frame 1, respectively. A ball joint assembly 3 is interference-fitted inside the sleeve 2, and a bushing assembly 6 connected to the vehicle frame is interference-fitted inside the mounting part 5. A steering knuckle 4 connected to the wheel hub is fixedly mounted on the top of the ball joint assembly 3. The ball joint assembly 3 includes a ball joint 31, a hydraulic component 32 disposed outside the ball joint 31, a fixed cylinder 33 fixed outside the hydraulic component 32, and a reversing positioning component 34 installed outside the ball joint 31.

[0055] The hydraulic component 32 includes a rubber main spring 321, a hydraulic chamber 322 opened outside the rubber main spring 321, and a plurality of flow channels opened between the hydraulic chamber 322, as well as hydraulic fluid filling the hydraulic chamber 322 and the flow channels. The reversing positioning component 34 includes a positioning piece 341 fixed to the bottom of the steering knuckle 4 and a positioning block 344 fixed to the outside of the ball joint 31, and the positioning block 344 is engaged inside the positioning piece 341.

[0056] Among them, the ball head 31 is rotatably disposed inside the hydraulic component 32. When the ball head 31 rotates, it squeezes the hydraulic chamber 322. The hydraulic chambers 322 are connected by flow channels. The positioning block 344 can be changed at different angles and then engaged in the positioning piece 341.

[0057] Specifically, the bushing assembly 6 is installed on one side of the frame, and the steering knuckle 4 is installed at the wheel hub. When the wheel passes over a bumpy road surface, the steering knuckle 4 moves upward with the wheel, thereby causing the swing arm 1 to swing upward. At this time, most of the impact energy and vibration are absorbed by the hydraulic fluid inside the hydraulic bushing 63 of the bushing assembly 6, reducing the impact force at the ball joint assembly 3. When the ball joint assembly 3 is impacted, the impact and vibration are absorbed by the use of the internal hydraulic component 32.

[0058] Please see the appendix Figure 1 , 2 4 and appendix Figure 6-10 The ball head component 31 includes a shaft 311 and a ball head body 312. The top center of the rubber main spring 321 has a ball groove 36. The top of the ball groove 36 is cylindrical and the bottom is spherical. The ball head body 312 is rotatably disposed inside the spherical structure of the ball groove 36. The shaft 311 is fixedly connected to the top of the ball head body 312. The top end of the shaft 311 is provided with an external thread, and a nut is installed at the external thread.

[0059] The hydraulic component 32 also includes a quick-pass flow channel 323, a decoupling component 324, and a main flow channel 325. The flow channels are the quick-pass flow channel 323 and the main flow channel 325. Two hydraulic chambers 322 are symmetrically opened on both sides of the rubber main spring 321, and the two quick-pass flow channels 323 and the two main flow channels 325 are opened outside the rubber main spring 321 and are connected between the two hydraulic chambers 322. The decoupling component 324 is located inside one side of the quick-pass flow channel 323 and is used to control the closing of the quick-pass flow channel 323. The quick-pass flow channel 323 is an arc-shaped direct flow channel, and the main flow channel 325 is a wavy curved channel. The cross-sectional width of the quick-pass flow channel 323 is greater than the cross-sectional width of the main flow channel 325.

[0060] Specifically, when the shaft 311 is driven to move up and down and rotate left and right, causing the ball head 312 to tilt and squeeze the rubber main spring 321, the rubber main spring 321 is subjected to slow and large deformation. For example, during low-frequency large-amplitude bumpy road surfaces and steering operations, the pressure change inside the hydraulic chamber 322 is relatively gentle. At this time, the pressure on the decoupling component 324 is insufficient to cause the internal decoupling membrane 3245 to displace. As a result, the fast-pass flow channel 323 is in a closed state, and the hydraulic fluid is pushed through the main flow channel 325. The liquid flows a long distance in the narrow channel, generating a large viscous frictional resistance, thereby providing high damping and high stiffness, effectively absorbing and isolating low-frequency large-amplitude vibrations, and avoiding the situation in traditional structures where the metal ball head and rubber pad are crushed or excessively worn by impact.

[0061] When the ball joint 312 vibrates rapidly and slightly when driving over a bumpy road surface, the pressure inside the hydraulic chamber 322 changes rapidly. At this time, the liquid in the main flow channel 325 cannot complete the long-distance flow in a short time due to its own inertia. At the same time, the high-frequency pressure is enough to cause the decoupling membrane 3245 to shift and open the quick-pass flow channel 323. Then the hydraulic fluid directly enters the quick-pass flow channel 323 for short-distance local flow. Because the liquid flows locally in a very small range, the frictional resistance is reduced, making the hydraulic component 32 exhibit low damping and low stiffness. It can gently filter the high-frequency fine vibrations and fill the small gaps between the ball joint 312 and the rubber main spring 321, reducing the wear caused by vibration in the gaps, thereby improving the service life of the ball joint 31.

[0062] Please see the appendix Figure 7-9 12 and Appendix Figure 13 The stepped hole 3241 is opened inside the rubber main spring 321 and connects the hydraulic chamber 322 and the quick-pass flow channel 323. The side flow groove 3242 is symmetrically opened at the narrow part of the stepped hole 3241 and is connected to the quick-pass flow channel 323. The fixing plate 3243 is fixedly connected to the inner wall of the wide part of the stepped hole 3241. The interior of the fixing plate 3243 is symmetrically opened with flow holes. The decoupling membrane 3245 is sealed and fitted to one side of the fixing plate 3243. The limiting post 3244 is fixedly connected to one side of the middle part of the fixing plate 3243.

[0063] A movable ring is installed at the center of the decoupling membrane 3245, and the movable ring is slidably disposed on the outer wall of the limiting post 3244. A baffle is extended at one end of the limiting post 3244. A sliding ring is fixedly connected to the outer wall of the decoupling membrane 3245, and the sliding ring is slidably disposed at the narrow part of the stepped hole 3241. When the movable ring of the decoupling membrane 3245 slides to the baffle of the limiting post 3244, the hydraulic fluid inside the hydraulic chamber 322 flows from the stepped hole 3241 through the side flow groove 3242 into the fast flow channel 323.

[0064] Specifically, at low frequency and large amplitude, the hydraulic fluid flows slowly and passes through the main flow channel 325. At high frequency and small amplitude, the fast-flow channel 323 is rapidly squeezed by the ball head 312, causing internal impact. Furthermore, the narrow flow channel 325 prevents the hydraulic fluid from passing through quickly. Consequently, the decoupling membrane 3245 is squeezed against the baffle end of the limiting post 3244, causing displacement of the decoupling membrane 3245. This moves the decoupling membrane 3245 to one side of the side flow channel 3242. The hydraulic fluid inside the pressure chamber 322 enters the side flow groove 3242 through the flow hole of the fixed plate 3243, and then flows into the fast flow channel 323, so that the hydraulic fluid can quickly flow within a small range to satisfy the high-frequency rotation and oscillation of the ball head 312. After the hydraulic chamber 322 on the side of the ball head squeezes the rubber main spring 321 and resets, the hydraulic chamber 322 that has entered the hydraulic fluid will squeeze the excess fluid back through the decoupling member 324 on the other side, thereby balancing the internal pressure of the two hydraulic chambers 322.

[0065] Please see the appendix Figure 3 , 4 6-8 and Appendix Figure 11 The reversing positioning component 34 also includes a positioning groove 342 and a fixing ring 343. The fixing ring 343 is fixedly connected to the outer wall of the shaft 311, and the positioning block 344 is symmetrically fixedly connected to the outer wall of the fixing ring 343. The positioning groove 342 is opened at equal angles inside the positioning piece 341. The shaft 311 is slidably disposed inside the positioning piece 341 and the bottom mounting angle of the steering knuckle 4, and the fixing ring 343 and the nut respectively abut against both sides of the bottom mounting angle of the steering knuckle 4.

[0066] The top of the fixed cylinder 33 is equipped with a mounting part 35. The mounting block 351 is interference-fitted into the inner side of the cylindrical structure of the ball groove 36. The bottom of the mounting block 351 is provided with a hemispherical groove corresponding to the ball head 312. The middle part of the mounting block 351 is provided with a matching mounting hole corresponding to the shaft 311, so that the mounting block 351 is sleeved on the outside of the shaft 311. The cover plate 352 abuts against the top of the mounting block 351. The bottom edge of the cover plate 352 is fixedly connected to the top edge of the fixed cylinder 33. The dust cover 353 is fixedly connected to the top of the fixed cylinder 33. The top of the dust cover 353 abuts against the bottom of the fixed ring 343 and is rotatably set on the outside of the shaft 311.

[0067] A sealing ring 354 is fixedly connected to the top outer wall of the rubber main spring 321, and a sealing ring 355 is fixedly connected to the bottom outer wall of the rubber main spring 321. The top inner wall of the fixing cylinder 33 is interference-fitted to the outside of the sealing ring 354, and the bottom outer wall of the fixing cylinder 33 is interference-fitted to the inside of the sealing ring 355. The inner wall of the fixing cylinder 33 is fitted against the outer wall of the rubber main spring 321, so that the hydraulic chamber 322 and the flow channel form a sealed space. The fixing cylinder 33 is interference-fitted to the inside of the sleeve 2.

[0068] Specifically, because the high-frequency vertical vibration during vehicle operation is converted into the lateral swing of the ball joint 31, the lateral upper and lower contact surfaces of the ball joint bear most of the alternating load and friction, thus causing premature clearance and ball joint wear. Therefore, after long-term use, the ball joint 31 can be replaced by removing the nut at the top of the shaft 311, pushing the shaft 311 downward to move the positioning block 344 out of the positioning groove 342, rotating the shaft 311 ninety degrees, and then moving the shaft 311 upward to re-engage the positioning block 344 into the corresponding positioning groove 342. Finally, the nut is tightened to fix it, thereby replacing the commonly worn surface of the ball joint 312 and avoiding excessive wear of the commonly worn surface due to long-term fixed use of the ball joint, which would lead to excessive clearance of the moving surface and affect the stability of operation.

[0069] First, the ball head 312 is placed inside the ball groove 36. Then, the mounting block 351 is sleeved on the outside of the shaft 311 and moved downwards, with an interference fit inside the ball groove 36. The cover plate 352 is sleeved on the outside of the shaft 311 and pressed downwards against the top of the mounting block 351. The cover plate 352 is then fixed to the top of the fixing cylinder 33, thus completing the assembly and fixing of the ball head 312. The dust cover 353 increases the dustproof effect on the top of the ball head assembly 3. The shaft 311 and the dust cover 353 are not fixedly set, so that when the hydraulic component 32 and the ball head 312 deflect, the dust cover 353 is deformed by squeezing it, ensuring that the shaft 311 and the hydraulic component 32 can be normally offset relative to each other.

[0070] Please see the appendix Figure 1 , 5 and attached Figure 10 Both ends of the screw 61 are provided with external threads, and nuts are installed at the external threads. The screw 61 is fixedly connected to the inner wall of the inner cylinder 62. The hydraulic bushing 63 is installed on the outside of the inner cylinder 62. The first sealing ring 65 is fixedly connected to one side of the outer wall of the hydraulic bushing 63, and the second sealing ring 66 is fixedly connected to one side of the hydraulic bushing 63. The outer cylinder 64 is interference-fitted to the outside of the first sealing ring 65 and the second sealing ring 66. The internal structure of the hydraulic bushing 63 is the same as the internal structure of the hydraulic component 32. The inner wall of the outer cylinder 64 is fitted to the outer wall of the hydraulic bushing 63, and the outer cylinder 64 is interference-fitted to the inside of the mounting part 5.

[0071] Specifically, the sealing ring 65 and sealing ring 66 are set together with the outer cylinder 64 to form a sealing structure to prevent hydraulic fluid leakage. The two ends of the screw 61 are fixed to the frame by nuts, thereby fixing the inner cylinder 62 to the frame. The outer cylinder 64 is installed on one side of the swing arm 1 by interference fit, so that when the swing arm 1 swings up and down, the internal hydraulic bushing 63 can filter the vibration and impact force.

[0072] When the vehicle is traveling on a rough and bumpy road, due to the inertia of the hydraulic fluid, it does not have time to complete a long journey within the narrow main channel 325. The high-frequency micro-pressure fluctuations will directly cause the internal decoupling membrane 3245 to change, so that the hydraulic fluid only flows a short distance within the fast-flow channel 323. At this time, the hydraulic bushing 63 exhibits low damping and low stiffness, thereby gently filtering high-frequency vibrations and improving the comfort of the vehicle ride.

[0073] When the vehicle encounters severe impacts such as potholes, sudden braking, or high-speed cornering, the slow and large deformation will generate a large pressure difference in the hydraulic chamber, which will drive the hydraulic fluid into the main flow channel 325. At this time, the hydraulic bushing 63 instantly exhibits high damping and high stiffness, providing strong end-stage support to attenuate severe impacts, prevent chassis loosening, and ensure the stability of the frame connection.

[0074] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lower control arm assembly for an automobile, comprising a control arm bracket (1), characterized in that, The two sides of the swing arm (1) are respectively fixedly connected to a sleeve (2) and a mounting part (5). The sleeve (2) is internally interference fitted with a ball joint assembly (3). The mounting part (5) is internally interference fitted with a bushing assembly (6) connected to the vehicle frame. The top of the ball joint assembly (3) is fixedly fitted with a steering knuckle (4) connected to the wheel hub. The ball joint assembly (3) includes a ball joint (31), a hydraulic component (32) disposed outside the ball joint (31), a fixed cylinder (33) fixed outside the hydraulic component (32), and a reversing positioning component (34) installed outside the ball joint (31). The hydraulic component (32) includes a rubber main spring (321), a hydraulic chamber (322) opened outside the rubber main spring (321), and a plurality of flow channels opened between the hydraulic chamber (322), as well as hydraulic fluid filling the hydraulic chamber (322) and the flow channels; The reversing positioning component (34) includes a positioning piece (341) fixed to the bottom of the steering knuckle (4) and a positioning block (344) fixed to the outside of the ball joint (31), and the positioning block (344) is engaged inside the positioning piece (341); The ball head (31) is rotatably disposed inside the hydraulic component (32). When the ball head (31) rotates, it squeezes the hydraulic chamber (322). The hydraulic chambers (322) are connected to each other through the flow channel. The positioning block (344) can be changed at different angles and then engaged in the positioning piece (341).

2. The lower control arm assembly for an automobile according to claim 1, characterized in that, The ball joint (31) includes a shaft (311) and a ball body (312). The rubber main spring (321) has a ball groove (36) at the top center. The top of the ball groove (36) is cylindrical and the bottom is spherical. The ball head (312) is rotatably disposed inside the spherical structure of the ball groove (36). The shaft (311) is fixedly connected to the top of the ball head (312). The top of the shaft (311) is provided with an external thread, and a nut is threaded at the external thread.

3. The lower control arm assembly for an automobile according to claim 2, characterized in that, The reversing positioning component (34) also includes a positioning groove (342) and a fixing ring (343); The fixing ring (343) is fixedly connected to the outer wall of the shaft (311), and the positioning block (344) is symmetrically fixedly connected to the outer wall of the fixing ring (343). The positioning groove (342) is opened at equal angles inside the positioning piece (341). The shaft (311) is slidably disposed inside the bottom mounting angle of the positioning piece (341) and the steering knuckle (4). The fixing ring (343) and the nut respectively abut against both sides of the bottom mounting angle of the steering knuckle (4).

4. The lower control arm assembly for an automobile according to claim 1, characterized in that, The hydraulic component (32) further includes a fast-flow channel (323), a decoupling component (324), and a main flow channel (325); The flow channels are a fast-flow flow channel (323) and a main flow channel (325); Two hydraulic chambers (322) are symmetrically opened on both sides of the rubber main spring (321), and two fast-flow channels (323) and two main flow channels (325) are opened on the outside of the rubber main spring (321) and are connected between the two hydraulic chambers (322). The decoupling member (324) is located inside one side of the fast-flow channel (323) and is used to control the closing of the fast-flow channel (323). The fast-flow channel (323) is an arc-shaped direct current channel, and the main current channel (325) is a wavy curved channel. The cross-sectional width of the fast-flow channel (323) is greater than that of the main current channel (325).

5. A lower control arm assembly for an automobile according to claim 4, characterized in that, The decoupling component (324) includes a stepped hole (3241), a side flow channel (3242), a fixing plate (3243), a limiting post (3244), and a decoupling membrane (3245). The stepped hole (3241) is opened inside the rubber main spring (321) and connects the hydraulic chamber (322) and the quick-pass flow channel (323). The side flow groove (3242) is symmetrically opened at the narrow part of the stepped hole (3241) and is connected to the quick-pass flow channel (323). The fixing piece (3243) is fixedly connected to the inner wall at the wide part of the stepped hole (3241). The fixing plate (3243) has symmetrically symmetrically opened flow holes inside, the decoupling membrane (3245) is sealed and fitted to one side of the fixing plate (3243), and the limiting post (3244) is fixedly connected to one side of the middle part of the fixing plate (3243).

6. A lower control arm assembly for an automobile according to claim 5, characterized in that, A movable ring is installed at the center of the decoupling membrane (3245), and the movable ring is slidably disposed on the outer wall of the limiting post (3244). A baffle is extended at one end of the limiting post (3244). A sliding ring is fixedly connected to the outer wall of the decoupling membrane (3245), and the sliding ring is slidably disposed at the narrow part of the stepped hole (3241). When the moving ring of the decoupling membrane (3245) slides to the baffle of the limiting post (3244), the hydraulic fluid inside the hydraulic chamber (322) flows from the stepped hole (3241) through the side flow groove (3242) into the fast flow channel (323).

7. A lower control arm assembly for an automobile according to claim 2, characterized in that, The top of the fixed cylinder (33) is equipped with an installation component (35), which includes an installation block (351), a cover plate (352), a dust cover (353), a sealing ring one (354), and a sealing ring two (355). The mounting block (351) is interference-fitted to the inner side of the cylindrical structure of the ball groove (36), and the bottom of the mounting block (351) is provided with a hemispherical groove corresponding to the ball head (312), and the middle part of the mounting block (351) is provided with a matching mounting hole corresponding to the shaft (311), so that the mounting block (351) is sleeved on the outside of the shaft (311); The cover plate (352) abuts against the top of the mounting block (351), and the bottom edge of the cover plate (352) is fixedly connected to the top edge of the fixing cylinder (33). The dust cover (353) is fixedly connected to the top of the fixing cylinder (33), and the top of the dust cover (353) abuts against the bottom of the fixing ring (343) and is rotatably disposed outside the shaft (311).

8. A lower control arm assembly for an automobile according to claim 7, characterized in that, The sealing ring one (354) is fixedly connected to the top outer wall of the rubber main spring (321), and the sealing ring two (355) is fixedly connected to the bottom outer wall of the rubber main spring (321). The fixed cylinder (33) is interference-fitted to the outside of the sealing ring one (354) and the inside of the sealing ring two (355), and the inner wall of the fixed cylinder (33) is fitted to the outer wall of the rubber main spring (321), so that the hydraulic chamber (322) and the flow channel form a sealed space. The fixed cylinder (33) is interference-fitted to the inside of the sleeve (2).

9. A lower control arm assembly for an automobile according to claim 4, characterized in that, The bushing assembly (6) includes a screw (61), an inner cylinder (62), a hydraulic bushing (63), an outer cylinder (64), a first sealing ring (65), and a second sealing ring (66). Both ends of the screw (61) are provided with external threads, and nuts are installed at the external threads. The screw (61) is fixedly connected to the inner wall of the inner cylinder (62). The hydraulic bushing (63) is installed on the outside of the inner cylinder (62). The first sealing ring (65) is fixedly connected to the outer wall of one side of the hydraulic bushing (63), and the second sealing ring (66) is fixedly connected to one side of the hydraulic bushing (63).

10. A lower control arm assembly for an automobile according to claim 9, characterized in that, The outer cylinder (64) is interference-fitted to the outside of the sealing ring one (65) and the sealing ring two (66). The internal structure of the hydraulic bushing (63) is the same as that of the hydraulic component (32). The inner wall of the outer cylinder (64) is fitted to the outer wall of the hydraulic bushing (63), and the outer cylinder (64) is interference-fitted to the inside of the mounting part (5).

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