Knuckle and ball pin press fitting mechanism

Abstract

The utility model relates to the technical field of automobile parts assembly, specifically refers to a knuckle and ball pin press -fitting mechanism, include: C -shaped frame top fixed area with floating joint's electric jar mechanism, and the base is equipped with limit piece and frock support seat, frock support seat sets up vertical adjustable expansion sleeve, forms the posture of the control lower connecting arm downward through wheel hub bearing mounting hole fixed knuckle, the limit component that expansion sleeve lower extreme setting, the electric jar output end exerts the pressure of pressing down when press -fitting makes knuckle move down, and limit piece provides first support force, and limit component generates second support force, and the pressure of pressing down is the sum of two support forces, and the moment of force of the pressure of pressing down and first support force to limit component cancels out each other, controls the residual overturning moment to be close to zero. The utility model discloses the moment balance design of establishing double support force and the pressure of pressing down, effectively eliminates ball pin press -fitting deflection and knuckle hole wall abrasion, realizes high -precision assembly.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts assembly technology, specifically to a steering knuckle and ball pin press-fitting mechanism. Background Technology

[0002] In the field of automotive steering system manufacturing, the press-fitting process of steering knuckles and ball joints is a crucial step in ensuring the reliability of the steering system. Current technologies suffer from the following limitations: Because steering knuckles are cast parts with complex shapes and poor precision, there is no suitable positioning reference. Eccentric press-fitting can easily lead to damage to the press head or workpiece due to uneven load. Traditional rigid press-fitting mechanisms struggle to adaptively correct angular deviations. Furthermore, the interference fit tolerance between the ball joint and the steering knuckle hole is small, and existing press-fitting equipment lacks sufficient pressure curve control precision, easily leading to micro-cracks on the mating surfaces or loosening after press-fitting. CN211072497U discloses a floating press-fitting fixture for steering knuckle ball joints, which partially solves the problems of difficult steering knuckle positioning and uneven force during press-fitting, but it does not address the issues of uneven load due to torque imbalance, insufficient steering knuckle positioning accuracy, and low changeover efficiency. Summary of the Invention

[0003] The main purpose of this utility model is to provide a steering knuckle and ball pin press-fitting mechanism, which aims to solve the problems of uneven load on the steering knuckle due to torque imbalance, as well as insufficient positioning accuracy and low changeover efficiency of the steering knuckle.

[0004] The technical solution adopted in this utility model is: a press-fitting mechanism for a steering knuckle and a ball joint, comprising:

[0005] A C-shaped frame, with an electric cylinder mechanism fixed at the top of the C-shaped frame, and a floating connector for connecting a ball pin installed at the output end of the electric cylinder mechanism;

[0006] The base is located on the upper surface of the bottom of the C-shaped frame. The base is provided with a limiting member that supports the lower connecting arm of the steering knuckle and provides a first vertical upward support force to the steering knuckle when the steering knuckle is moved to its maximum position.

[0007] A tooling support is connected to a base. The tooling support is equipped with a vertically adjustable expansion sleeve that passes through the wheel hub bearing mounting hole to fix the steering knuckle with the lower connecting arm facing down and the upper connecting arm facing up. The lower end of the expansion sleeve is equipped with a limiting component. The limiting component is used to abut against the expansion sleeve when the steering knuckle moves down to the maximum position and to provide a second vertically upward supporting force to the expansion sleeve.

[0008] The output end of the electric cylinder mechanism applies a vertical downward pressure to the steering knuckle when the ball pin is pressed into the ball pin mounting hole on the upper connecting arm, causing the steering knuckle to move to its maximum position.

[0009] The downward pressure is the sum of the first support force and the second support force, and the horizontal torque generated by the downward pressure relative to the limiting component is equal to the horizontal torque generated by the first support force relative to the limiting component.

[0010] Furthermore, the limiting component includes a first disc spring disposed between the expansion sleeve and the tooling support; the first disc spring is arranged vertically, and when the expansion sleeve moves down to its maximum position, the upper end of the first disc spring abuts against the expansion sleeve and the lower end abuts against the tooling support, providing a second vertically upward supporting force to the expansion sleeve.

[0011] Furthermore, the limiting assembly also includes a lifting shaft and a first linear bearing; the first linear bearing is a ring bearing structure fixed to the tooling support seat; the lower end of the lifting shaft is vertically movable and passes through the first linear bearing, and the upper end of the lifting shaft is connected to the tensioning sleeve; the first disc spring is sleeved on the lifting shaft and its upper end is fixedly connected to the lifting shaft.

[0012] Furthermore, the tooling support is also provided with a movable seat for connecting the expansion sleeve and columns placed on both sides of the movable seat; the columns are provided with vertical linear guide rails; the movable seat is vertically movable and connected to the linear guide rails; the lower end of the movable seat is fixedly connected to the upper end of the lifting shaft.

[0013] Furthermore, both sides of the movable seat are provided with interfaces for installing tension sleeves.

[0014] Furthermore, the base is provided with multiple support rods arranged vertically; the lower end of the support rod is fixed to the base, and the upper end abuts against the lower end of the expansion sleeve when the expansion sleeve moves to its maximum position.

[0015] Furthermore, the electric cylinder mechanism includes a connecting block installed at the output end of the electric cylinder mechanism and multiple guide rods that can move vertically and pass through the C-shaped frame; the lower ends of the guide rods are fixedly connected to the connecting block.

[0016] Furthermore, the floating joint is connected to the connecting block via a thrust ball bearing, and the thrust ball bearing is also provided with a positioning ring, which forms an axial limiting fit with the end face of the ball pin.

[0017] Furthermore, the lower end of the limiting member is provided with a second disc spring arranged vertically; the upper end of the second disc spring is connected to the limiting member, and the lower end is fixed on the base. When the expansion sleeve moves down to the maximum position, the second disc spring provides the limiting member with a first vertical upward support force.

[0018] Furthermore, the top surface of the limiting member is provided with a block-shaped structure of an inclined surface for engaging with the lower end of the lower connecting arm;

[0019] The top surface of the limiting member is also provided with a slot for engaging the bottom of the lower connecting arm.

[0020] The beneficial effects of this utility model are as follows: 1. In use, this utility model utilizes the first supporting force provided by the limiting component and the second supporting force provided by the limiting assembly to form a torque balance with the downward pressure from the output end of the electric cylinder mechanism during the steering knuckle pressing process. This effectively reduces the influence of the overturning moment to a negligible level, avoiding problems such as ball pin misalignment and unilateral wear of the steering knuckle hole wall caused by torque imbalance. The C-shaped frame structure has strong load-bearing capacity and can enclose the pressure and support reaction force inside the frame, greatly reducing the strength requirements of the installation structure. Furthermore, the expansion sleeve can provide high-precision positioning for the steering knuckle. This achieves precise positioning during the pressing process of the steering knuckle and ball pin, and while ensuring clamping reliability, significantly improves the versatility and changeover efficiency of the equipment, solving the technical problem of poor fixture adaptability in traditional pressing processes.

[0021] 2. A first disc spring is installed between the expansion sleeve and the tooling support. It can absorb impact energy through elastic deformation, avoid rigid collision between the expansion sleeve and the tooling support, and provide a second vertical upward support force to the expansion sleeve.

[0022] 3. Setting up a sliding connection between the lifting shaft and the first linear bearing can reduce the frictional resistance between the lifting shaft and the tooling support, extending the service life of the component; and it also plays a guiding role during the downward movement of the expansion sleeve, preventing the expansion sleeve from shifting during the descent process, which could lead to failure of the steering knuckle press-fitting.

[0023] 4. A movable seat is installed, and the tightening sleeve is fixed on the movable seat. The vertical adjustment of the movable seat drives the vertical adjustment of the tightening sleeve. This avoids the tightening sleeve absorbing direct impact and enhances the applicability of the invention, facilitating the replacement of tightening sleeves or positioning devices adapted to different steering knuckles. A linear guide rail is installed inside the tooling support, allowing the movable seat to slide on the linear guide rail. This provides the movable seat with high-precision guidance and a smooth sliding path, significantly improving the stability and reliability of the press-fitting mechanism. At the same time, the low-friction characteristics of the guide rail make the movement of the movable seat smoother when the lifting shaft adjusts the height, reducing mechanical jamming and parts wear, and ensuring assembly accuracy. In addition, the rigid support of the guide rail supports the load of the movable seat, suppressing vibration through the dynamic balance between the downward pressure of the electric cylinder, the second support force of the first disc spring, and the first support force provided by the limiting component. This prevents the steering knuckle from undergoing slight displacement due to force fluctuations, thereby ensuring the coaxiality of the press-fitting of the ball pin and the ball pin hole.

[0024] 5. Interfaces for installing tension sleeves are provided on both sides of the movable seat, allowing different tension sleeves to be installed on both sides of the movable seat. When switching the press-fitting of the steering knuckle, simply rotate the movable seat 180 degrees vertically, which facilitates the quick switching and installation of the left and right steering knuckles by the staff.

[0025] 6. A support rod is installed to form a rigid limit when the lifting shaft descends to its limit position, which shares the axial load of the disc spring, avoids overpressure that could cause deformation of the parts, and at the same time constrains the horizontal freedom of the moving seat to prevent swaying caused by lateral forces during the pressing process, ensuring precise alignment of the ball pin and the steering knuckle.

[0026] 7. The guide rod is connected to the output end of the electric cylinder mechanism through the connecting block, and the guide rod can slide on the top of the C-shaped frame, so that the movement direction of the guide rod and the output end of the electric cylinder mechanism is always consistent with the movement direction of the guide rod, which can ensure the downward pressing direction of the electric cylinder output end and avoid deviation.

[0027] 8. A positioning ring is set up to cooperate with the reverse thrust ball bearing structure to generate free floating in the plane, which can adapt to the positional error of the target hole and ensure the press-fit quality.

[0028] 9. A second disc spring is installed at the lower end of the limiting component. When the steering knuckle moves down to its maximum position, the second disc spring is in a compressed state. The limiting component restricts the lateral movement of the steering knuckle, while the limiting component generates a first supporting force vertically upward through the tension of the second disc spring. In the process of eliminating the overturning moment, the magnitude of the first supporting force can be controlled by selecting the second disc spring, thereby reducing the influence of the overturning moment to a negligible level.

[0029] 10. By setting a block structure on the top surface of the limiting component, the contact area between the lower end of the steering knuckle lower connecting arm and the limiting component can be increased, enhancing stability and reducing the swaying or deflection of the lower connecting arm during movement. The inclined surface design can guide the lower connecting arm to automatically align with the limiting component during movement. The slotted bottom of the lower connecting arm is fitted to prevent lateral displacement of the lower connecting arm and limit the horizontal offset of the lower connecting arm, ensuring controllable movement trajectory. It also prevents the lower connecting arm from dislodging from the limiting component due to vibration or impact, thus improving system reliability. Attached Figure Description

[0030] Figure 1 This is a side view of the press-fitting mechanism for the steering knuckle and ball pin in an embodiment of this utility model;

[0031] Figure 2 This is an embodiment of the present utility model. Figure 1 Enlarged view of point A in the middle;

[0032] Figure 3 This is a schematic diagram of the electric cylinder mechanism at the top of the C-shaped frame in an embodiment of this utility model;

[0033] Figure 4 This is a front view of the displacement sensor mechanism in an embodiment of this utility model;

[0034] Figure 5 This is a top view of the displacement sensor mechanism in an embodiment of the present invention;

[0035] Figure 6 This is a side view of the tooling support and base structure in an embodiment of this utility model;

[0036] Figure 7 This is a rear view of the tooling support and base structure in an embodiment of this utility model;

[0037] Figure 8 This is a schematic diagram of the tooling support and base structure in an embodiment of this utility model;

[0038] Figure 9 This is a schematic diagram of the steering knuckle structure in an embodiment of the present invention;

[0039] Figure 10 This is a schematic diagram of the limiting member in an embodiment of the present utility model;

[0040] Figure 11 This is a schematic diagram of force analysis in an embodiment of this utility model;

[0041] Wherein: 1—steering knuckle; 101—upper connecting arm; 102—lower connecting arm; 103—wheel hub bearing mounting hole; 2—tooling support seat; 201—linear guide rail; 3—expansion sleeve; 4—locking nut; 5—electric cylinder; 501—motor; 502—guide rod; 503—displacement sensor; 504—second linear bearing; 505—output end of electric cylinder mechanism; 506—connecting block; 507—pressure sensor; 508—limiting plate; 6—floating pressure head; 601—thrust ball bearing; 602—positioning ring; 7—ball pin; 8—lifting shaft; 801—first linear bearing; 802—first disc spring; 9—base; 10—C-shaped frame; 11—moving seat; 12—limiting component; 1201—second disc spring; 1202—block structure; 1203—slot; 13—support rod; 14—handle. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary. The drawings are not drawn to scale and are intended to explain this utility model, and should not be construed as limiting this utility model.

[0043] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0046] This utility model relates to a steering knuckle and ball pin press-fitting mechanism, which is used in the press-fitting process of steering knuckle and ball pin and is suitable for scenarios with high load, high coaxiality and high positioning accuracy requirements.

[0047] like Figure 1-11 As shown, a steering knuckle and ball pin press-fitting mechanism includes:

[0048] C-shaped frame 10, with an electric cylinder mechanism fixed to the top of the C-shaped frame 10, and a floating connector 6 for connecting ball pin 7 installed at the output end 505 of the electric cylinder mechanism;

[0049] The base 9 is located on the upper surface of the bottom of the C-shaped frame 10. The base 9 is provided with a limiting member 12 that supports the lower connecting arm 102 of the steering knuckle 1 and provides a first vertical upward support force to the steering knuckle 1 when the steering knuckle 1 is moved to the maximum position.

[0050] A tooling support 2 is connected to a base 9. The tooling support 2 is provided with a vertically adjustable expansion sleeve 3 for passing through the wheel hub bearing mounting hole 103 to fix the steering knuckle 1 with the lower connecting arm 102 facing down and the upper connecting arm 101 facing up. The lower end of the expansion sleeve 3 is provided with a limiting component. The limiting component is used to abut against the expansion sleeve 3 and provide a second vertically upward supporting force to the expansion sleeve 3 when the steering knuckle 1 moves down to the maximum position.

[0051] The output end 505 of the electric cylinder mechanism applies a vertical downward pressure to the steering knuckle 1 when the steering knuckle 1 is moved to its maximum position by the ball pin mounting hole on the upper connecting arm 101 and the ball pin mounting 7.

[0052] The downward pressure is the sum of the first support force and the second support force, and the horizontal torque generated by the downward pressure relative to the limiting component is equal to the horizontal torque generated by the first support force relative to the limiting component.

[0053] During the press-fitting process of the steering knuckle 1 and ball pin 7, the wheel hub bearing mounting hole 103 is aligned with the expansion sleeve 3 and locked. After the steering knuckle 1 is positioned, the electric cylinder mechanism is activated. The output end 505 of the electric cylinder mechanism drives the floating joint 6 to descend. As the floating joint 6 descends, the ball pin 7 contacts the steering knuckle 1. When the steering knuckle 1 moves to its maximum position, the ball pin 7 is pressed into the ball pin mounting hole in the upper connecting arm 101 of the steering knuckle 1. At this time, the limiting component 12 engages with the lower connecting arm 102 to prevent the steering knuckle 1 from moving laterally, while providing a vertically upward first support force F1. When the expansion sleeve 3 moves to its maximum position, the limiting component restricts the expansion sleeve 3 from moving. Moving further down, the limiting component provides a second vertically upward support force F2, the pressure provided by the output end 505 of the electric cylinder mechanism is F, and F=F1+F2, the distance from the central axis of the output end 505 of the electric cylinder mechanism to the central axis of the tooling support 2 is L1, and the distance from the central axis of the contact surface between the lower connecting arm 102 and the limiting component 12 to the tooling support 2 is L2. Through reasonable process verification, empirical data of F is obtained. According to the formula F*L1-F1*L2=M residual overturning moment, with the residual overturning moment M=0 as the target, by selecting a suitable second disc spring 1201 and preset L1 and L2, the influence of the overturning moment can be reduced to a negligible level.

[0054] This invention eliminates the problem of uneven loading during assembly by employing a dual-support force synergy and torque balance design. The first and second support forces are balanced with the downward pressure generated by the output end 505 of the electric cylinder mechanism, bringing the residual overturning torque close to zero. This solves the problems of ball pin misalignment and hole wall wear caused by torque imbalance during steering knuckle press-fitting, improving assembly accuracy and product lifespan. Furthermore, the use of the expansion sleeve 3 enables high-precision positioning of the steering knuckle 1, uniform force distribution, rapid assembly and disassembly, keyless connection, and anti-loosening and vibration resistance. It can also adapt to workpieces of different sizes and protect mating surfaces. While ensuring clamping reliability, it significantly improves the versatility and changeover efficiency of the equipment, solving the technical problem of poor fixture adaptability in traditional press-fitting processes.

[0055] Preferably, the steering knuckle 1 is fixed to the expansion sleeve 3 by a locking nut 4. The cooperation between the locking nut 4 and the expansion sleeve 3 enables quick clamping of the steering knuckle 1, simplifying the traditional complex clamping structure, and provides uniform radial clamping force through threaded locking, ensuring the positioning stability of the steering knuckle.

[0056] In one embodiment, such as Figure 1 , 7As shown, the limiting component includes a first disc spring 802 disposed between the tension sleeve 3 and the tooling support 2; the first disc spring 802 is arranged vertically, and when the tension sleeve 3 moves down to the maximum position, the upper end of the first disc spring 802 abuts against the tension sleeve 3 and the lower end abuts against the tooling support 2 to provide a second vertically upward supporting force for the tension sleeve 3.

[0057] The first disc spring 802 is set so that when the tension sleeve 3 is pressed down to the maximum position, the first disc spring 802 is compressed to the limit position. The first disc spring 802 absorbs the impact energy through elastic deformation, avoids rigid collision between the tension sleeve and the tooling support, and can provide a second vertical upward support force to the tension sleeve 3.

[0058] In one embodiment, such as Figure 1 , 7 As shown in Figure 8, the limiting assembly also includes a lifting shaft 8 and a first linear bearing 801; the first linear bearing 801 is a ring bearing structure fixed on the tooling support 2; the lower end of the lifting shaft 8 is vertically movable and passes through the first linear bearing 801, and the upper end of the lifting shaft 8 is connected to the tension sleeve 3; the first disc spring 802 is sleeved on the lifting shaft 8 and its upper end is fixedly connected to the lifting shaft 8.

[0059] Because the first linear bearing 801 is slidably connected inside the lifting shaft 8, when the tensioning sleeve 3 moves to its limit position, the first linear bearing 801 slides to its limit position on the lifting shaft 8, at which point the first disc spring 802 is in a compressed state. This structure acts as a guide during the downward movement of the tensioning sleeve 3, preventing it from shifting during descent and causing steering knuckle press-fit failure. Furthermore, the first disc spring 802 prevents rigid collisions, protecting the tensioning sleeve and tooling support; it also ensures that the tensioning sleeve quickly returns to its original position after unloading.

[0060] The first linear bearing 801 and the lifting shaft 8 adopt telescopic sliding adjustment to reduce the frictional resistance between the lifting shaft 8 and the tooling support 2, which is suitable for high-frequency or high-speed lifting actions and extends the service life of the components.

[0061] In one embodiment, such as Figure 1 , 6 As shown in Figures 7 and 8, the tooling support 2 is also provided with a movable seat 11 for connecting the expansion sleeve 3 and columns placed on both sides of the movable seat 11; the columns are provided with a vertical linear guide rail 201; the movable seat 11 is vertically movable and connected to the linear guide rail 201; the lower end of the movable seat 11 is fixedly connected to the upper end of the lifting shaft 8.

[0062] Set up a movable seat 1, and then fix the tension sleeve 3 on the movable seat. Move the movable seat 1 to drive the tension sleeve 3 to adjust vertically. On the one hand, this can prevent the tension sleeve from absorbing direct impact, and on the other hand, it can enhance the applicability of the utility model and facilitate the replacement of tension sleeves 3 or positioning devices that are compatible with different steering knuckles.

[0063] A linear guide rail 201 is installed inside the tooling support 2, which limits the sliding motion of the movable seat 11 to a high-precision guide and a smooth sliding path. This significantly improves the stability and reliability of the pressing mechanism, preventing the movement direction of the lifting shaft from deviating when the steering knuckle moves down, and avoiding the misalignment of the ball pin 7 during the pressing process. Simultaneously, the low-friction characteristics of the guide rail make the movement of the movable seat 11 smoother when the lifting shaft 8 adjusts its height, reducing mechanical jamming and component wear, and ensuring assembly accuracy. Furthermore, the rigid support of the guide rail on the movable seat 11 suppresses vibration through the dynamic balance between the downward pressure of the electric cylinder, the second support force of the first disc spring 802, and the first support force provided by the limiting component. This prevents the steering knuckle 1 from experiencing slight displacement due to force fluctuations, thereby ensuring the coaxiality of the ball pin 7 and the ball pin mounting hole during pressing. This design achieves efficient, low-loss, and highly compatible precision assembly through a rigid-flexible structural optimization.

[0064] In one embodiment, such as Figure 1 , 6 As shown, both sides of the movable base 11 are provided with interfaces for installing the tightening sleeve 3.

[0065] The interfaces on both sides of the movable seat 11 can be used to install mirrored setting tension sleeves 3.

[0066] Preferably, such as Figure 1 , 6 As shown in Figures 7 and 8, the tooling support 2 is detachably and vertically connected to the base 9.

[0067] Preferably, such as Figure 1 , 6 As shown in Figures 7 and 8, the tooling support 2 is equipped with a handle 14.

[0068] A handle 14 is provided, and mirror-symmetrical expansion sleeves 3 are provided on both sides of the tooling support 2. The handle 14 is connected to the tooling support 2. The tooling support 2 can be rotated 180 degrees vertically through the handle 14, and the left and right parts of the steering knuckle 1 can be quickly switched for press fitting.

[0069] In one embodiment, such as Figure 1 , 6 As shown in Figure 8, the base 9 is provided with multiple support rods 13 arranged vertically; the lower end of the support rod 13 is fixed on the base 9, and the upper end abuts against the lower end of the expansion sleeve 3 when the expansion sleeve 3 moves down to the maximum position.

[0070] A support rod 13 is provided to support the moving seat 11 during the pressing process. When the lifting shaft 8 descends to its limit position, the moving seat 11 contacts the support rod 13 and abuts against it. Through the abutment and cooperation between the moving seat 11 and the support rod 13, since the expansion sleeve 3 is fixedly connected to the moving seat 11, the expansion sleeve 3 will no longer descend. When the lifting shaft 8 descends to its limit position, the support rod 13 and the moving seat 11 form a rigid limit, which reduces the axial load of the first disc spring 802, avoids overpressure that could cause deformation of the parts, and at the same time constrains the horizontal degree of freedom of the moving seat 11, preventing swaying caused by lateral force during the pressing process, and ensuring the precise alignment of the ball pin 7 and the steering knuckle 1.

[0071] In one embodiment, such as Figure 1 , 2 As shown in Figure 3, the electric cylinder mechanism includes a connecting block 506 installed at the output end 505 of the electric cylinder mechanism and multiple guide rods 502 that can move vertically and pass through the C-shaped frame 10; the lower end of the guide rods 502 is fixedly connected to the connecting block 506.

[0072] Preferably, such as Figure 1 , 3 As shown, a second linear bearing 504 is also provided at the top of the C-shaped frame, and a guide rod 502 passes through the second linear bearing 504. The second linear bearing 504 serves as a guide.

[0073] Preferably, such as Figure 1 , 3 As shown, the axis of the guide rod 502 is parallel to the direction of movement of the output end 505 of the electric cylinder mechanism.

[0074] Preferably, such as Figure 1 , 3 As shown, the electric cylinder mechanism may also be equipped with an electric cylinder 5, the output end of which is the output end 505 of the electric cylinder mechanism; a motor 501 is provided to drive the electric cylinder 5.

[0075] Preferably, such as Figure 1 , 3 As shown, the upper end of the guide rod 502 is provided with a limiting piece 508 that restricts the guide rod from falling out when the guide rod 502 moves downward.

[0076] After the steering knuckle 1 is fixed, when pressing the steering knuckle 1 begins, the electric cylinder motor 501 is started, driving the electric cylinder 5. The output end of the electric cylinder and the connecting block 506 connected to it are pressed down, causing the two guide rods 502 to slide downward on the top of the C-shaped frame. The axis of the guide rod 502 is parallel to the movement direction of the output end 505 of the electric cylinder mechanism, which ensures the downward pressing direction of the electric cylinder output end and avoids deviation.

[0077] In one embodiment, such as Figure 1 , 2As shown in Figures 3, 4, and 5, a displacement sensor 503 is provided on the top of the C-shaped frame 10 and is fixed to the top of the C-shaped frame 10. The moving end of the displacement sensor 503 is fixed to the connecting block 506.

[0078] The connecting block 506 is equipped with a moving end of a displacement sensor 503. The displacement movement of the connecting block 506 is converted into displacement data of the electric cylinder output end in real time through the displacement sensor 503.

[0079] In one embodiment, such as Figure 1 , 2 As shown, the pressing mechanism also includes a pressure sensor 507, which is located at the connection between the output end 505 of the electric cylinder mechanism and the connecting block 506.

[0080] The pressure sensor 507 is placed between the output end of the electric cylinder mechanism and the connecting block 506 to measure the pressure provided at the output end of the electric cylinder.

[0081] In one embodiment, such as Figure 1 , 2 As shown, the floating joint 6 is connected to the connecting block 506 through the thrust ball bearing 601. The thrust ball bearing 601 is also provided with a positioning ring 602, which forms an axial limiting fit with the end face of the ball pin 7.

[0082] The positioning ring 602 is designed to work in conjunction with the reverse thrust ball bearing 601. This design ensures positioning accuracy while allowing for a certain degree of adaptive angle adjustment, effectively compensating for workpiece assembly deviations. On the other hand, the hard limiting effect of the positioning ring 602 prevents damage to the mating surfaces caused by press-fit overload.

[0083] In one embodiment, such as Figure 1 , 6 As shown in Figure 8, the lower end of the limiting member 12 is provided with a second disc spring 1201 arranged vertically; the upper end of the second disc spring 1201 is connected to the limiting member 12, and the lower end is fixed on the base 9. When the tension sleeve 3 moves down to the maximum position, the second disc spring 1201 provides the limiting member 12 with a first vertical upward support force.

[0084] A second disc spring 1201 is provided at the lower end of the limiting member 12. When the steering knuckle 1 moves down to the maximum position, the second disc spring 1201 is in a compressed state. Since the limiting member 12 restricts the lateral movement of the steering knuckle, and the limiting member generates a first supporting force vertically upward through the tension of the second disc spring 1201.

[0085] In one embodiment, such as Figure 1 , 10 As shown, the top surface of the limiting member 12 is provided with a block structure 1201 with an inclined surface for engaging with the lower end of the lower connecting arm 102.

[0086] The top surface of the limiting member 12 is also provided with a slot 1202 for engaging the bottom of the connecting arm 102.

[0087] By setting up the block structure 1201, the contact area between the lower end of the lower connecting arm 102 of the steering knuckle 1 and the limiting member 12 is increased. This can disperse stress, reduce the pressure per unit area, and avoid wear or deformation caused by local stress concentration. On the other hand, it can enhance stability. The contact on both sides forms symmetrical support, reducing the swaying or deflection of the lower connecting arm during movement. Moreover, the inclined surface design can guide the lower connecting arm 102 to automatically align with the limiting member 12 during movement.

[0088] A slot 1202 is provided on the top surface of the limiting member 12. The slot 1202 engages with the bottom of the lower connecting arm 102 to form a mechanical interlock. This not only prevents lateral displacement and limits the horizontal offset of the lower connecting arm, ensuring controllable movement trajectory, but also prevents the lower connecting arm from dislodging from the limiting member due to vibration or impact, thus improving system reliability.

[0089] like Figure 11 As shown, during the press-fitting process of the steering knuckle and ball pin, the hub bearing mounting hole is aligned with the expansion sleeve 3 and locked by the locking nut 4. After the steering knuckle 1 is positioned, the electric cylinder mechanism is activated. The output end 505 of the electric cylinder mechanism drives the floating joint 6 to descend. As the floating joint 6 descends, the ball pin 7 contacts the ball pin mounting hole of the connecting arm 101 on the steering knuckle 1. The moving seat 11 slides on the linear guide rail 201 as the steering knuckle 1 descends. The lifting shaft 8 slides in the first linear bearing 801, and the first disc spring 802 is compressed and deformed, generating a second vertical upward support force. The steering knuckle 1 descends a certain distance, and the lower end of the steering knuckle 1 contacts the limiting member 12. The lower end of the steering knuckle 1 is locked into the limiting member 12 to prevent the steering knuckle 1 from sliding laterally. The floating joint 6 pushes the steering knuckle 1 to continue to descend. The second disc spring 1201 is deformed and generates a first support force until the lifting shaft 8 descends to the limit position. The steering knuckle 1 stops descending, and the floating joint 6 continues to press down, pressing the ball pin 7 into the steering knuckle 1. At this time, the first supporting force generated by the second disc spring 1201 is F2, the second supporting force generated by the first disc spring 802 on the lifting shaft side is F1, and the pressure provided by the electric cylinder output end is F. Taking the lifting shaft as the target point, the torque analysis is performed: then F=F1+F2, the distance from the centerline of the electric cylinder output end to the centerline of the lifting shaft 8 is L1, and the distance from the centerline of the contact surface between the steering knuckle control arm mounting hole 102 and the limit member 12 to the lifting shaft is L2. Through reasonable process verification, empirical data of F is obtained. According to the formula F*L1-F1*L2=M residual overturning moment, with the residual overturning moment M=0 as the target, by selecting a suitable second disc spring 1201 and preset L1 and L2, the influence of the overturning moment can be reduced to a negligible level, significantly improving the assembly quality and efficiency in the pressing process of the steering knuckle and ball pin, and eliminating problems such as ball pin 7 misalignment and single-sided wear of the steering knuckle 1 hole wall caused by torque imbalance.

[0090] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A steering knuckle and ball pin press-fitting mechanism, characterized in that, include: C-shaped frame (10), with an electric cylinder mechanism fixed on the top of the C-shaped frame (10), and a floating joint (6) for connecting the ball pin (7) installed at the output end (505) of the electric cylinder mechanism. The base (9) is located on the upper surface of the bottom of the C-shaped frame (10). The base (9) is provided with a limiting member (12) that supports the lower connecting arm (102) of the steering knuckle (1) and provides a first vertical upward support force to the steering knuckle (1) when the steering knuckle (1) moves down to the maximum position. Tooling support base (2) is connected to base (9). Tooling support base (2) is provided with a vertically adjustable expansion sleeve (3) for passing through wheel hub bearing mounting hole (103) to fix steering knuckle (1) with lower connecting arm (102) facing down and upper connecting arm (101) facing up. The lower end of expansion sleeve (3) is provided with a limiting component. The limiting component is used to abut against expansion sleeve (3) when steering knuckle (1) moves down to the maximum position and to provide expansion sleeve (3) with a second vertical upward support force. The output end (505) of the electric cylinder mechanism applies a vertical downward pressure to the steering knuckle (1) when the steering knuckle (1) is moved down to its maximum position by the ball pin mounting hole on the upper connecting arm (101) from the press-fit ball pin (7); The downward pressure is the sum of the first support force and the second support force, and the horizontal torque generated by the downward pressure relative to the limiting component is equal to the horizontal torque generated by the first support force relative to the limiting component.

2. The steering knuckle and ball pin press-fitting mechanism according to claim 1, characterized in that, The limiting component includes a first disc spring (802) disposed between the expansion sleeve (3) and the tooling support (2); the first disc spring (802) is arranged vertically, and when the expansion sleeve (3) moves down to the maximum position, the upper end of the first disc spring (802) abuts against the expansion sleeve (3) and the lower end abuts against the tooling support (2) to provide a second vertically upward supporting force for the expansion sleeve (3).

3. The steering knuckle and ball pin press-fitting mechanism according to claim 2, characterized in that, The limiting assembly also includes a lifting shaft (8) and a first linear bearing (801); the first linear bearing (801) is a ring bearing structure fixed on the tooling support seat (2); the lower end of the lifting shaft (8) is vertically movable and passes through the first linear bearing (801), and the upper end of the lifting shaft (8) is connected to the expansion sleeve (3); the first disc spring (802) is sleeved on the lifting shaft (8) and its upper end is fixedly connected to the lifting shaft (8).

4. The steering knuckle and ball pin press-fitting mechanism according to claim 3, characterized in that, The tooling support base (2) is also provided with a movable base (11) for connecting the expansion sleeve (3) and columns placed on both sides of the movable base (11); the columns are provided with a vertical linear guide rail (201); the movable base (11) is vertically movable and connected to the linear guide rail (201); the lower end of the movable base (11) is fixedly connected to the upper end of the lifting shaft (8).

5. The steering knuckle and ball pin press-fitting mechanism according to claim 4, characterized in that, Both sides of the movable seat (11) are provided with interfaces for installing the tightening sleeve (3).

6. The steering knuckle and ball pin press-fitting mechanism according to claim 1, characterized in that, The base (9) is provided with a number of vertically arranged support rods (13); the lower end of the support rod (13) is fixed on the base (9), and the upper end abuts against the lower end of the expansion sleeve (3) when the expansion sleeve (3) moves down to the maximum position.

7. The steering knuckle and ball pin press-fitting mechanism according to claim 1, characterized in that, The electric cylinder mechanism includes a connecting block (506) installed at the output end (505) of the electric cylinder mechanism and multiple guide rods (502) that can move vertically and pass through the C-shaped frame (10); the lower end of the guide rods (502) is fixedly connected to the connecting block (506).

8. The steering knuckle and ball pin press-fitting mechanism according to claim 7, characterized in that, The floating joint (6) is connected to the connecting block (506) through a thrust ball bearing (601). The thrust ball bearing (601) is also provided with a positioning ring (602), which forms an axial limiting fit with the end face of the ball pin (7).

9. The steering knuckle and ball pin press-fitting mechanism according to claim 1, characterized in that, The lower end of the limiting member (12) is provided with a second disc spring (1201) arranged vertically; the upper end of the second disc spring (1201) is connected to the limiting member (12), and the lower end is fixed on the base (9). When the expansion sleeve (3) moves down to the maximum position, the second disc spring (1201) provides the limiting member (12) with a first vertical upward support force.

10. The steering knuckle and ball pin press-fitting mechanism according to claim 1, characterized in that, The top surface of the limiting member (12) is provided with a block structure (1202) for engaging with the lower end of the lower connecting arm (102). The top surface of the limiting member (12) is also provided with a slot (1203) for engaging the bottom of the connecting arm (102).

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