Integrated spherical hinge bearing type control arm and manufacturing method thereof

Abstract

The invention relates to the technical field of automobile parts, and discloses an integrated spherical hinge bearing type control arm and a manufacturing method thereof.The integrated spherical hinge bearing type control arm is manufactured through an integrated forging process, aluminum alloy serves as a control frame raw material, and through pre-forging, finish forging, solid solution and aging treatment, interference press fitting of a spherical hinge bearing and a control frame and precise fit clearance control, the integrated spherical hinge bearing bearing type control arm is manufactured. The problems that a split type structure is low in strength and large in assembly error are solved, and the service life is prolonged. By means of a multi-ring linkage structure in the service life extension cover, a shaking gap between a ball head and a bearing can be detected, an oval pointing ring positions the maximum abrasion position, lubricating oil is automatically released in cooperation with a liquid storage bag and a pressure spray head, abnormal sound and abrasion caused by insufficient lubrication of a traditional control arm are avoided, and the maintenance cost is reduced; meanwhile, epoxy resin electrophoretic coating and polyurethane rubber double-layer protection outside the control frame are combined with sealing of the inner rubber pad and the outer rubber pad, impurities are effectively isolated, corrosion is prevented, and the weather resistance and reliability of the control arm are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of automobile parts, in particular to an integrated ball hinge bearing type control arm and a manufacturing method thereof. BACKGROUND

[0002] The automobile control arm is a core bearing and force transmission component of an automobile chassis suspension system, mainly serving as a key role of connecting a vehicle body and a wheel, transmitting force and torque, and limiting the movement track of the wheel, and can effectively transmit the longitudinal force, the lateral force and the vertical impact load received by the wheel during driving to the vehicle body, buffers the road bumps in cooperation with a shock absorber and a spring, reduces the vibration transmission to a cabin, and improves the driving comfort. When the vehicle is steering, the control arm can constrain the wheel to rotate according to the preset track through the structural characteristics of the control arm, guarantee the steering accuracy and the steering stability, and avoid the excessive deviation or abnormal swing of the wheel.

[0003] However, the current mainstream control arm adopts a split structure, the ball hinge assembly and the arm body are connected or assembled by welding through bolts, and problems such as low structural strength and large assembly error exist, the connection is easy to loosen under long-term alternating load, the overall bearing capacity of the control arm is reduced, and the service life is shortened.

[0004] At the same time, the existing control arm generally relies on the initial filled lubricating grease to realize lubrication, lacks a continuous lubrication supply mechanism, and as the use time increases, the lubricating grease is gradually consumed or aged, the friction resistance between the ball head and the bearing is increased, and problems such as abnormal noise and accelerated wear are easy to occur, which not only affects the driving comfort, but also causes the ball hinge to fail prematurely, frequent disassembly and replacement are required, and the vehicle maintenance cost and operation complexity are increased, and therefore, the application provides an integrated ball hinge bearing type control arm and a manufacturing method thereof. SUMMARY

[0005] In view of the defects of the prior art, the application provides an integrated ball hinge bearing type control arm and a manufacturing method thereof, which have the advantages of solving a series of problems.

[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme: an integrated ball hinge bearing type control arm, comprising,

[0007] The control arm comprises a control frame, a first protective layer is fixedly connected to the outside of the control frame, a second protective layer is fixedly connected to the outside of the first protective layer, a ball hinge bearing is fixedly connected to the inside of the control arm, a ball head is rotatably connected to the inside of the ball hinge bearing, and a connecting bolt is fixedly connected to the top of the ball head.

[0008] The service life cover comprises a service life shell rotatably clamped at the top of the control arm, an inner ring movably connected inside the service life shell, the inner ring being slidably connected outside the ball head, the abutting part of the inner ring and the ball head being arranged in an arc shape, an intermediate ring rotatably connected outside the inner ring, an outer ring rotatably connected outside the intermediate ring, a pointing ring rotatably connected inside the service life shell, the outer ring being matched with the pointing ring, a liquid storage bag fixedly connected to the bottom of the pointing ring, lubricating oil being injected into the inside of the liquid storage bag, and a pressure nozzle being in communication with the outside of the liquid storage bag, the pressure nozzle being opened and closed through the moving distance of the outer ring.

[0009] Preferably, the top of the control arm is provided with a mounting groove, the bottom of the service life shell is fixedly connected with a mounting clamping block, the mounting groove and the mounting clamping block are matched, the top of the inner ring is fixedly connected with an inner rubber pad, the bottom of the inner rubber pad is in abutment with the outside of the ball head, the top of the service life shell is fixedly connected with an outer rubber protective pad, and the inner wall of the outer rubber protective pad is in abutment with the outside of the connecting bolt.

[0010] Preferably, the service life cover further comprises two first rotating shafts rotatably connected outside the inner ring, the two first rotating shafts are rotatably connected inside the intermediate ring, the two first rotating shafts are coaxially arranged, the intermediate ring is rotatably connected with two second rotating shafts outside, the two second rotating shafts are rotatably connected inside the outer ring, the two second rotating shafts are coaxially arranged, and the shaft cores of the two first rotating shafts and the shaft cores of the two second rotating shafts are vertically arranged in the same plane.

[0011] Preferably, the outer ring is rotatably connected with a rotating ring outside, the rotating ring is fixedly connected with a volute spring outside, the volute spring is fixedly connected with an abutment ring outside, and the inner wall of the pointing ring is matched with the abutment ring.

[0012] Preferably, the inner wall of the pointing ring is fixedly connected with a driving sleeve, the inside of the driving sleeve is fixedly connected with a driving spring, one end of the driving spring is fixedly connected with a driving rod, the driving rod is slidably connected inside the driving sleeve, the bottom of the driving sleeve is provided with a driving groove, the bottom of the driving rod is fixedly connected with a connecting rod, and the connecting rod is slidably connected inside the driving groove.

[0013] Preferably, the bottom of the pointing ring is fixedly connected with a support frame, the liquid storage bag is fixedly connected to the top of the support frame, the bottom of the connecting rod is fixedly connected with a driving plate, the driving plate is slidably connected inside the support frame, and the driving plate is slidably connected to the bottom of the liquid storage bag.

[0014] Preferably, one end of the driving plate is fixedly connected with a pressure rod, one side of the pressure rod is in abutment with one side of the pressure nozzle, and the bottom of the driving plate is fixedly connected with a guide plate.

[0015] Preferably, the pointing ring is arranged in an elliptical shape, the inside of the life-extending shell is provided with a sliding groove, and the outside of the pointing ring is fixedly connected with a sliding block which is slidingly connected inside the sliding groove.

[0016] A manufacturing method of an integrated ball hinge bearing type control arm, comprising the following steps:

[0017] S1: the material of the control frame is aluminum alloy, the ball hinge bearing is a sintered metal bearing, and the ball head is bearing steel;

[0018] An aluminum alloy round bar is sawn into a blank of the control frame by a numerical control sawing machine, and an assembly hole is reserved at a position where the ball hinge bearing is to be installed;

[0019] S2: the sawed blank of the control frame is heated, the temperature is controlled to be 500-520 DEG C, the temperature is kept for 60-90 min, the temperature fluctuation is less than or equal to ± 5 DEG C, the blank is heated to ensure that the aluminum alloy is fully softened and the grain is not coarse;

[0020] S3: the mold is preheated to 200-250 DEG C, the heated blank is put into the preforming mold, a forging pressure of 1200-1400 kN is applied, the pressure is kept for 15±2 s, the preforming temperature is 480-500 DEG C, and the arm body contour of the control frame 3 is preliminarily shaped;

[0021] Then the preformed part is transferred to the precision finish forging mold, a pressure of 1400-1600 kN is applied, the pressure is kept for 10±2 s, the arm body size accuracy is ± 0.2 mm, the surface roughness is Ra3.2 mu m, the finish forging temperature is 450-480 DEG C, and finish forging is performed;

[0022] S4: the arm body of the control frame after finish forging is bored, the coaxiality is less than or equal to 0.03 mm, the surface roughness is Ra1.6 mu m, the boring cutter rotating speed is 800 r / min, and the feeding amount is 0.1 mm / r, so as to avoid the vibration marks affecting the assembly accuracy;

[0023] S5: then the sintered metal bearing is pressed into the boring hole of the control frame, the pressing force is 8-10 kN, and the pressing speed is 5 mm / s;

[0024] Then the ball head is installed into the ball hinge bearing, the adjustment gap is 0.05-0.1 mm, 5±0.5 g of lithium-based lubricating grease is filled, and the rotation of the ball head is ensured to be flexible;

[0025] S6: the arm body after the integrated ball hinge is subjected to solid solution + aging treatment, the solid solution temperature is 530-550 DEG C, the temperature is kept for 30±5 min, the water cooling speed after solid solution is greater than or equal to 20 DEG C / s, the aging temperature is 160-180 DEG C, and the temperature is kept for 8±0.5 h, so that the yield strength of the arm body is improved to be greater than or equal to 270 MPa;

[0026] S7: The first protective layer is an epoxy resin electrophoretic coating, and the arm body after oxidation is coated with the epoxy resin electrophoretic coating at a voltage of 200±10 V to form a paint film with a thickness of 15±2 μm, and then gradually heated and dried at 60-70 ℃ to avoid cracking of the paint film;

[0027] S8: The second protective layer is polyurethane rubber, the arm body bushing mounting seat is placed into a vulcanization mold, polyurethane rubber raw materials are injected, an injection pressure of 80-100 MPa is applied, and vulcanization is performed at 180-200 ℃ for 15-20 min, and the mold cavity is provided with exhaust holes with a diameter of ≥1 mm to avoid bubbles in the bushing.

[0028] Compared with the prior art, the application provides a kind of integrated ball hinge bearing type control arm and its manufacturing method, with the following beneficial effects:

[0029] 1、The invention can detect the wobble gap between the ball head and the bearing in real time through the linkage structure of the inner ring, the middle ring and the outer ring in the service life cover, and the elliptical pointing ring can accurately position the maximum wear area; cooperate with the liquid storage bag and the pressure nozzle, when the part wobbles to the threshold value, automatically extrude and release the lubricating oil to form an oil film, solve the problem that the traditional control arm relies on the initial lubricating grease and is easy to produce abnormal sound and wear due to grease loss, reduce the maintenance cost.

[0030] 2、The invention is provided with an epoxy resin electrophoretic coating and a polyurethane rubber double-layer protection structure outside the control frame, the former avoids cracking through accurate temperature control drying, and the latter is formed by high-pressure vulcanization and the mold is provided with exhaust holes to prevent bubbles, double protection can effectively isolate dust and water vapor, prevent rust of the ball hinge part, and the inner and outer rubber pads further seal to avoid impurities from entering and affecting the rotation flexibility, improve the weather resistance and reliability of the control arm.

[0031] 3、The invention adopts an integrated forging process, the control frame is made of aluminum alloy through pre-forging and final forging, and is combined with solid solution and aging treatment to avoid the problem of insufficient strength caused by bolt connection or welding of split structure; the ball hinge bearing and the control frame are interference press-fitted, which greatly reduces the assembly error and reduces the risk of loosening under long-term alternating load, prolonging the overall service life of the control arm. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic diagram of the three-dimensional structure of the invention; Figure 2 is a schematic diagram of the three-dimensional structure of the control frame part of the invention; Figure 3 is a schematic diagram of the three-dimensional structure of the inside of the service life cover of the invention; Figure 4 is a schematic diagram of the three-dimensional structure of the sliding block part of the invention; Figure 5 is Figure 4 the enlarged structure schematic diagram of A part. Figure 6 The schematic diagram of the three-dimensional structure inside the driving sleeve of the application is shown in the figure; Figure 7 The schematic diagram of the enlarged structure of part B is shown in the figure. Figure 4

[0033] In the figure: 1, control arm; 2, service life cover; 3, control frame; 4, first protective layer; 5, second protective layer; 6, spherical hinge bearing; 7, ball head; 8, service life shell; 9, mounting groove; 10, mounting clamping block; 11, connecting bolt; 12, inner ring; 13, first rotating shaft; 14, middle ring; 15, outer ring; 16, abutting ring; 17, pointing ring; 18, inner rubber pad; 19, outer rubber protective pad; 20, second rotating shaft; 21, rotating ring; 22, worm spring; 23, sliding groove; 24, sliding block; 25, support frame; 26, driving sleeve; 27, driving rod; 28, connecting rod; 29, driving plate; 30, driving spring; 31, driving groove; 32, liquid storage bag; 33, pressure nozzle; 34, pressure rod; 35, guide plate. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0035] As introduced in the background, the deficiencies in the prior art exist, in order to solve the above technical problems, the application provides an integrated spherical hinge bearing type control arm and a manufacturing method thereof.

[0036] In a typical embodiment of the application, as shown in Figures 1-7 An integrated spherical hinge bearing type control arm and a manufacturing method thereof, comprising,

[0037] The control arm 1 comprises a control frame 3.

[0038] The control arm 1 is fixedly connected with a spherical hinge bearing 6,

[0039] Specifically, the material of the control frame 3 is aluminum alloy, which is Al-Mg-Si system, T6 heat treatment state, tensile strength ≥ 310 MPa, yield strength ≥ 270 MPa, and density 2.71 g / cm³.

[0040] The blank length calculation of the control frame 3: according to the volume of the final forging part, the blank size is determined by the arm body and the spherical hinge seat, and the calculation formula is:

[0041] The blank volume of the control frame 3​ = final forging volume × forging allowance coefficient K;

[0042] Wherein, K = 1.15-1.2, to cover the forging shrinkage 3-5% and subsequent machining allowance;

[0043] The formula of the blank length L is: , r = 25mm, the radius of the aluminum alloy round bar;

[0044] The aluminum alloy round bar is sawn into the blank of the control frame 3 with a length of 75±1mm by using the numerical control sawing machine according to the above formula, so as to ensure that the end face flatness is ≤0.1mm and avoid subsequent forging eccentricity;

[0045] The sawed blank of the control frame 3 is placed into the continuous heating furnace, the temperature is controlled at 500-520℃, the temperature is kept for 60-90min, the temperature fluctuation is ≤±5℃, so as to ensure that the aluminum alloy is fully softened and the grain is not coarse for blank heating;

[0046] The heated blank of the control frame 3 is placed into the pre-forging die of the 1600T hydraulic machine, the die is preheated to 200-250℃ in advance, the forging pressure of 1200-1400kN is applied, the pressure is kept for 15±2s, the arm body contour is preliminarily shaped, the pre-forging temperature is 480-500℃;

[0047] The pre-forged piece of the control frame 3 is transferred to the precision final forging die, the pressure of 1400-1600kN is applied, the pressure is kept for 10±2s, so that the arm body size precision reaches ±0.2mm, the surface roughness Ra is 3.2μm, the final forging temperature is 450-480℃, so that the brittle transition temperature of ≥6082 aluminum alloy is avoided to avoid cracks;

[0048] The arm body of the control frame 3 after final forging is bored by using the numerical control lathe, specifically the IT7 precision grade, the hole diameter is φ30±0.02mm, the coaxiality is ≤0.03mm, the surface roughness Ra is 1.6μm, the boring cutter rotating speed is 800r / min, the feed rate is 0.1mm / r, so as to avoid the vibration marks affecting the assembly precision;

[0049] The spherical hinge bearing 6 is a sintered metal bearing, which is Cu-Sn-Pb alloy powder plus iron powder, the porosity is 15%, the hardness HB is 80-100, the friction coefficient μ is 0.12-0.15, and the temperature resistance is ≤180℃;

[0050] The spherical hinge bearing 6 is press-fitted in the inside of the arm body of the control frame 3 through interference fit, and the interference amount is 0.05-0.08mm;

[0051] The spherical hinge bearing 6 is rotatably connected with the ball head 7, the ball head 7 is made of GCr15 bearing steel and is quenched and tempered; the top of the ball head 7 is fixedly connected with the connecting bolt 11;

[0052] Specifically, the burnt spherical hinge bearing 6 is pressed into the spherical hinge seat hole by a servo press, and the pressing force is 8-10 kN;

[0053] The pressing force F is estimated according to the formula F = π × d × L × μ × p, wherein the matching hole diameter d = 30 mm, the matching length L = 25 mm, the friction coefficient μ = 0.15, and the matching pressure p = 80 MPa;

[0054] The theoretical pressing force is approximately 28.3 kN, and the actual value is taken as a safety value, the pressing speed is 5 mm / s, and the hole is cleaned with alcohol before pressing to make the oil stain ≤5 mg / m²;

[0055] Then the ball head 7 is installed in the bearing, the matching gap is adjusted to 0.05-0.1 mm, 5±0.5 g of lithium-based lubricating grease is filled from the oil filling hole, and the ball head is ensured to rotate flexibly;

[0056] The first protective layer 4 is fixedly connected outside the control frame 3, the first protective layer 4 is an epoxy resin electrophoretic coating, the second protective layer 5 is fixedly connected outside the first protective layer 4, and the second protective layer 5 is polyurethane rubber;

[0057] Specifically, the control frame 3 after the integrated spherical hinge is subjected to solid solution + aging treatment, the solid solution temperature is 530-550℃, the holding time is 30±5 min, the water cooling speed after solid solution is ≥20℃ / s to ensure uniform precipitation of solute; the aging temperature is 160-180℃, and the holding time is 8±0.5h, so that the yield strength of the arm body of the control frame 3 is increased to above 270MPa;

[0058] The arm body of the control frame 3 after oxidation is subjected to epoxy resin electrophoretic coating, the voltage is 200±10V, a paint film with a thickness of 15±2μm is formed, and then the paint film is gradually dried at 60-70℃, specifically 40℃→60℃→70℃, to avoid cracking of the paint film;

[0059] The arm body bushing mounting seat of the control frame 3 is placed into a vulcanization mold, polyurethane rubber raw materials are injected, an injection pressure of 80-100MPa is applied, and vulcanization is performed at 180-200℃ for 15-20 min, an exhaust hole with a diameter of ≥1mm is arranged in the mold cavity to avoid bubbles in the bushing;

[0060] The control arm 1 is manufactured through the above method;

[0061] More specifically, the service life cover 2 includes a service life shell 8 rotatably clamped on the top of the control arm 1, the top of the control arm 1 is provided with a mounting groove 9, the bottom of the service life shell 8 is fixedly connected with a mounting clamping block 10, and the mounting groove 9 and the mounting clamping block 10 are matched;

[0062] When the service life cover 2 needs to be used, at this time, the mounting block 10 at the bottom of the service life shell 8 is inserted into the inside of the mounting groove 9 at the top of the control arm 1, at this time, the service life cover 2 is rotated and clamped and fixed at the top of the control arm 1.

[0063] The inside of the service life shell 8 is movably connected with an inner ring 12, the inner ring 12 is slidably connected to the outside of the ball head 7, the abutting part between the inner ring 12 and the ball head 7 is arranged in an arc shape, the outside of the inner ring 12 is rotatably connected with an intermediate ring 14, the outside of the intermediate ring 14 is rotatably connected with an outer ring 15, the inside of the service life shell 8 is rotatably connected with a pointing ring 17, the inside of the service life shell 8 is provided with a sliding groove 23, the outside of the pointing ring 17 is fixedly connected with a sliding block 24, and the sliding block 24 is slidably connected to the inside of the sliding groove 23.

[0064] The service life cover 2 further comprises two first rotating shafts 13 rotatably connected to the outside of the inner ring 12, both of the two first rotating shafts 13 are rotatably connected to the inside of the intermediate ring 14, the two first rotating shafts 13 are coaxially arranged, the outside of the intermediate ring 14 is rotatably connected with two second rotating shafts 20, both of the two second rotating shafts 20 are rotatably connected to the inside of the outer ring 15, the two second rotating shafts 20 are coaxially arranged, and the shaft cores of the two first rotating shafts 13 and the shaft cores of the two second rotating shafts 20 are vertically arranged in the same plane.

[0065] Through the above structure, when the ball head 7 rotates in the inside of the ball hinge bearing 6, the second rotating shaft 20 will not rotate with the rotation of the ball head 7, avoiding interference with the shaking detection of the ball head 7 in the inside of the ball hinge bearing 6. Specifically, when the ball head 7 rotates in the inside of the ball hinge bearing 6, the ball head 7 drives the inner ring 12 or the intermediate ring 14 to rotate at this time, and the inner ring 12 and the intermediate ring 14 rotate in the inside of the outer ring 15. When the ball head 7 shakes in the ball hinge bearing 6 due to long-term use, the ball head 7 drives the inner ring 12 to shake at this time, and the shaking is conducted to the intermediate ring 14 through the first rotating shaft 13, the intermediate ring 14 shakes and conducts the shaking to the outer ring 15 through the second rotating shaft 20, and drives the outer ring 15 to shake.

[0066] The outer ring 15 is matched with the pointing ring 17, the pointing ring 17 is arranged in an ellipse, the bottom of the pointing ring 17 is fixedly connected with a liquid storage bag 32, the inside of the liquid storage bag 32 is filled with lubricating oil, the outside of the liquid storage bag 32 is connected with a pressure spray head 33, and the pressure spray head 33 is opened and closed through the moving distance of the outer ring 15.

[0067] The outside of the outer ring 15 is rotatably connected with a rotating ring 21, the outside of the rotating ring 21 is fixedly connected with a volute spring 22, the outside of the volute spring 22 is fixedly connected with an abutting ring 16, and the outside of the abutting ring 16 is matched with the inner wall of the pointing ring 17.

[0068] The inner wall of the pointing ring 17 is fixedly connected with a driving sleeve 26, the inside of the driving sleeve 26 is fixedly connected with a driving spring 30, one end of the driving spring 30 is fixedly connected with a driving rod 27, the driving rod 27 is slidingly connected in the inside of the driving sleeve 26, the bottom of the driving sleeve 26 is provided with a driving slot 31, the bottom of the driving rod 27 is fixedly connected with a connecting rod 28, the connecting rod 28 is slidingly connected in the inside of the driving slot 31;

[0069] The bottom of the pointing ring 17 is fixedly connected with a support frame 25, the top of the support frame 25 is fixedly connected with a liquid storage bag 32, the bottom of the connecting rod 28 is fixedly connected with a driving plate 29, the driving plate 29 is slidingly connected in the inside of the support frame 25, the driving plate 29 is slidingly connected at the bottom of the liquid storage bag 32;

[0070] One end of the driving plate 29 is fixedly connected with a pressure rod 34, one side of the pressure rod 34 abuts against one side of the pressure nozzle 33, the bottom of the driving plate 29 is fixedly connected with a guide plate 35.

[0071] Further, in the above-mentioned scheme, through the above-mentioned structure, the position of the spherical hinge bearing 6 and the ball head 7 with large wear can be lubricated to form an oil film, thereby improving the service life of the spherical hinge bearing 6 and the ball head 7. Specifically, the outer ring 15 shakes to drive the rotating ring 21 to shake, the inner ring 12 shakes to drive the worm spring 22 to deform, the worm spring 22 deforms to drive the abutting ring 16 to shake, the abutting ring 16 shakes to abut against the inner wall of the pointing ring 17. Since the pointing ring 17 is arranged in an elliptical shape, the abutting ring 16 shakes to drive the pointing ring 17 to rotate in the inside of the service life shell 8, the elliptical protruding end of the pointing ring 17 points to the maximum gap of the spherical hinge bearing 6 and the ball head 7. At this time, the outside of the abutting ring 16 abuts against the driving rod 27 to drive the driving rod 27 to slide in the inside of the driving sleeve 26, the driving spring 30 is compressed, the connecting rod 28 slides in the inside of the driving slot 31, the connecting rod 28 moves to drive the driving plate 29 to move, the driving plate 29 moves to drive the pressure rod 34 to move, the pressure rod 34 moves to drive the pressure nozzle 33 to move to press the liquid storage bag 32, and part of the lubricating oil in the liquid storage bag 32 is pressed out through the pressure nozzle 33 to flow into the maximum gap of the spherical hinge bearing 6 and the ball head 7 through the guide plate 35 to form an oil film for lubrication, thereby improving the service life of the spherical hinge bearing 6 and the ball head 7.

[0072] The top of the inner ring 12 is fixedly connected with an inner rubber pad 18, the bottom of the inner rubber pad 18 abuts against the outside of the ball head 7, the top of the service life shell 8 is fixedly connected with an outer rubber protective pad 19, the inner wall of the outer rubber protective pad 19 abuts against the outside of the connecting bolt 11. Through the above-mentioned structure, dust can be prevented from entering between the spherical hinge bearing 6 and the ball head 7 during use of the control arm 1 to reduce the service life of the spherical hinge bearing 6 and the ball head 7.

[0073] The working principle of the present application is: when the service life prolonging cover 2 is needed, the mounting clamping block 10 at the bottom of the service life prolonging shell 8 is inserted into the inside of the mounting groove 9 at the top of the control arm 1, and the service life prolonging cover 2 is clamped and fixed at the top of the control arm 1 by rotating the service life prolonging cover 2.

[0074] When the ball head 7 shakes due to long-time use of the ball hinge bearing 6, the ball head 7 drives the inner ring 12 to shake, and the shaking is conducted to the middle ring 14 through the first rotating shaft 13, the middle ring 14 drives the outer ring 15 to shake through the second rotating shaft 20.

[0075] The shaking of the outer ring 15 drives the rotating ring 21 to shake, the shaking of the inner ring 12 drives the worm spring 22 to deform, the deformation of the worm spring 22 drives the abutting ring 16 to shake, the shaking of the abutting ring 16 abuts against the inner wall of the pointing ring 17, and since the pointing ring 17 is arranged in an elliptical shape, the shaking of the abutting ring 16 drives the pointing ring 17 to rotate in the inside of the service life prolonging shell 8, and the elliptical protruding end of the pointing ring 17 points to the maximum gap between the ball hinge bearing 6 and the ball head 7.

[0076] At this time, the outside of the abutting ring 16 abuts against the driving rod 27 and drives the driving rod 27 to slide in the inside of the driving sleeve 26, the driving spring 30 is compressed, the connecting rod 28 slides in the driving groove 31, the movement of the connecting rod 28 drives the driving plate 29 to move, the movement of the driving plate 29 drives the pressure rod 34 to move, the movement of the pressure rod 34 drives the pressure nozzle 33 to move to press the liquid storage bag 32, and part of the lubricating oil in the inside of the liquid storage bag 32 is pressed out through the pressure nozzle 33, flows into the maximum gap between the ball hinge bearing 6 and the ball head 7 through the guide plate 35 to form an oil film for lubrication, and the service life of the ball hinge bearing 6 and the ball head 7 is improved.

[0077] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An integrated ball joint bearing control arm, characterized by: Including, The control arm (1) includes a control frame (3), the outer part of the control frame (3) is fixedly connected with a first protective layer (4), the outer part of the first protective layer (4) is fixedly connected with a second protective layer (5), the inner part of the control arm (1) is fixedly connected with a ball hinge bearing (6), the inner part of the ball hinge bearing (6) is rotatably connected with a ball head (7), the top of the ball head (7) is fixedly connected with a connecting bolt (11); The service life cover (2) includes a service life shell (8) rotatably clamped on the top of the control arm (1), the inner part of the service life shell (8) is movably connected with an inner ring (12), the outer part of the inner ring (12) is slidably connected with the ball head (7), the abutting part of the inner ring (12) and the ball head (7) is arranged in an arc shape, the outer part of the inner ring (12) is rotatably connected with an intermediate ring (14), the outer part of the intermediate ring (14) is rotatably connected with an outer ring (15), the inner part of the service life shell (8) is rotatably connected with a pointing ring (17), the outer ring (15) is matched with the pointing ring (17), the bottom of the pointing ring (17) is fixedly connected with a liquid storage bag (32), the inner part of the liquid storage bag (32) is filled with lubricating oil, the outer part of the liquid storage bag (32) is connected with a pressure spray head (33) in communication, and the pressure spray head (33) is opened and closed through the moving distance of the outer ring (15).

2. The integrated ball joint bearing control arm of claim 1, wherein: The top of the control arm (1) is provided with a mounting groove (9), the bottom of the service life shell (8) is fixedly connected with a mounting clamping block (10), the mounting groove (9) and the mounting clamping block (10) are matched, the top of the inner ring (12) is fixedly connected with an inner rubber pad (18), the bottom of the inner rubber pad (18) abuts against the outer part of the ball head (7), and the top of the service life shell (8) is fixedly connected with an outer rubber protective pad (19). The inner wall of the outer rubber protective pad (19) abuts against the outer part of the connecting bolt (11).

3. The unitized ball jointed bearing control arm of claim 2, wherein: The service life cover (2) further includes two first rotating shafts (13) rotatably connected with the outer part of the inner ring (12), both the first rotating shafts (13) are rotatably connected with the inner part of the intermediate ring (14), both the first rotating shafts (13) are coaxially arranged, the outer part of the intermediate ring (14) is rotatably connected with two second rotating shafts (20), both the second rotating shafts (20) are rotatably connected with the inner part of the outer ring (15), both the second rotating shafts (20) are coaxially arranged, and the shaft cores of the first rotating shafts (13) and the shaft cores of the second rotating shafts (20) are vertically arranged in the same plane.

4. The integrated ball joint bearing control arm of claim 3, wherein: The outer part of the outer ring (15) is rotatably connected with a rotating ring (21), the outer part of the rotating ring (21) is fixedly connected with a worm spring (22), the outer part of the worm spring (22) is fixedly connected with an abutting ring (16), and the outer part of the abutting ring (16) is matched with the inner wall of the pointing ring (17).

5. An integrated ball joint bearing control arm as defined in claim 4, wherein: The inner wall of the pointing ring (17) is fixedly connected with a driving sleeve (26), the inside of the driving sleeve (26) is fixedly connected with a driving spring (30), one end of the driving spring (30) is fixedly connected with a driving rod (27), the driving rod (27) is slidingly connected in the inside of the driving sleeve (26), the bottom of the driving sleeve (26) is provided with a driving slot (31), the bottom of the driving rod (27) is fixedly connected with a connecting rod (28), the connecting rod (28) is slidingly connected in the inside of the driving slot (31).

6. An integrated ball joint bearing control arm as defined in claim 5, wherein: The bottom of the pointing ring (17) is fixedly connected with a support frame (25), the liquid storage bag (32) is fixedly connected to the top of the support frame (25), the bottom of the connecting rod (28) is fixedly connected with a driving plate (29), the driving plate (29) is slidingly connected in the inside of the support frame (25), and the driving plate (29) is slidingly connected to the bottom of the liquid storage bag (32).

7. An integrated ball joint bearing control arm as defined in claim 6, wherein: One end of the driving plate (29) is fixedly connected with a pressure rod (34), one side of the pressure rod (34) abuts one side of the pressure nozzle (33), and the bottom of the driving plate (29) is fixedly connected with a guide plate (35).

8. The integrated ball joint bearing control arm of claim 1, wherein: The pointing ring (17) is arranged in an oval shape, the inside of the life-extending shell (8) is provided with a sliding slot (23), and the outside of the pointing ring (17) is fixedly connected with a sliding block (24) slidingly connected in the inside of the sliding slot (23).

9. A manufacturing method of the integrated ball joint bearing type control arm, for the integrated ball joint bearing type control arm according to any one of claims 1 to 8, characterized by, The method comprises the following steps: S1: the material of the control frame (3) is aluminum alloy, the spherical hinge bearing (6) is a sintered metal bearing, and the ball head (7) is bearing steel; An aluminum alloy round bar is sawn into a blank of the control frame (3) by using a numerical control sawing machine, and an assembly hole is reserved at a position where the spherical hinge bearing (6) is to be installed; S2: the blank of the control frame (3) after sawing is heated, the temperature is controlled to be 500-520 DEG C, the temperature is kept for 60-90 min, the temperature fluctuation is less than or equal to ± 5 DEG C, the aluminum alloy is fully softened, the grain is not coarse, and the blank is heated; S3: the mold is preheated to 200-250 DEG C, the heated blank is put into a preforming die, a forging pressure of 1200-1400 kN is applied, the pressure is kept for 15±2 s, the preforming temperature is 480-500 DEG C, and the arm body profile of the control frame (3) is preliminarily shaped; Then the preformed part is transferred to a precision finish forging die, a pressure of 1400-1600 kN is applied, the pressure is kept for 10±2 s, the arm body size precision reaches ± 0.2 mm, the surface roughness is Ra3.2 μm, the finish forging temperature is 450-480 DEG C, and finish forging is performed; S4: the arm body of the control frame (3) after finish forging is bored, the coaxiality is less than or equal to 0.03 mm, the surface roughness is Ra1.6 μm, the boring cutter rotating speed is 800 r / min, and the feeding amount is 0.1 mm / r, so as to avoid vibration marks affecting assembly precision; S5: then the sintered metal bearing is pressed into the boring hole in the control frame (3), the pressing force is 8-10 kN, and the pressing speed is 5 mm / s; Then the ball head (7) is installed in the spherical hinge bearing (6), the adjustment gap is 0.05-0.1 mm, 5±0.5 g of lithium-based lubricating grease is filled, and the ball head is ensured to rotate flexibly. S6: The arm body after the integrated ball hinge is subjected to solid solution + aging treatment, the solid solution temperature is 530-550℃, the holding time is 30±5 min, the water cooling speed after the solid solution is ≥20℃ / s; the aging temperature is 160-180℃, the holding time is 8±0.5h, so that the yield strength of the arm body is increased to above 270MPa; S7: The first protective layer (4) is an epoxy resin electrophoretic coating, the arm body after oxidation is subjected to epoxy resin electrophoretic coating, the voltage is 200±10V, a paint film with a thickness of 15±2μm is formed, and then gradual temperature rising drying is carried out at 60-70℃, so as to avoid paint film cracking; S8: The second protective layer (5) is polyurethane rubber, the arm body bushing mounting seat is placed into a vulcanization mold, polyurethane rubber raw materials are injected, an injection pressure of 80-100MPa is applied, and vulcanization is carried out at 180-200℃ for 15-20 min, an exhaust hole with a diameter of ≥1mm is arranged in the mold cavity, so as to avoid bubbles in the bushing.

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