A swing arm rotation detection method and system

Abstract

The present application relates to the field of vehicle swing arm, and in particular to a swing arm rotation detection method and system. The method comprises triggering based on a swing arm rotation detection instruction, carrying the swing arm to an active seat assembly to reach an initial state. A driving assembly clamps one end of a swing rod unit of the swing arm. A synchronous assembly abuts against the outer peripheral wall of the swing rod unit. The driving assembly drives the swing rod unit to rotate around the central axis of the swing rod unit to obtain first rotation data. The rotation of the swing rod unit drives the synchronous assembly to rotate to obtain second rotation data. Based on the first rotation data and the second rotation data, a swing arm rotation detection result is obtained. Thus, the problem that the clamping force of the driving assembly is difficult to control in the swing arm rotation detection process is solved.

Description

Technical Field

[0001] This invention relates to the field of vehicle control arms, and more specifically, to a method and system for detecting control arm rotation. Background Technology

[0002] The control arm comprises a control rod unit and a connecting arm unit. The connecting arm unit is fitted onto one end of the control rod unit and can rotate relative to the control rod unit. The steering knuckle, control rod unit, connecting arm unit, and vehicle body are connected in sequence. When the vehicle needs to steer, the steering knuckle and control rod unit rotate together relative to the connecting arm unit. To ensure that the vehicle can both steer and support, the control rod unit and connecting arm unit must be designed to accommodate both relative rotation and limit movement after installation. After the control arm is assembled, the torque required for relative rotation between the connecting arm unit and control rod unit needs to be tested. If the torque driving the relative rotation between the connecting arm unit and control rod unit is too small, the connection strength between the connecting arm unit and control rod unit is considered insufficient.

[0003] Currently, the outer circumferential surface of the rocker arm unit is typically held by a drive assembly, which then drives the rocker arm unit to rotate around its own axis. If the clamping force of the drive assembly is too small, it will not be able to drive the rocker arm unit to rotate; if the clamping force of the drive assembly is too large, it will damage the part where the outer circumferential surface of the rocker arm unit mates with the steering knuckle. Summary of the Invention

[0004] To address the problem of difficulty in controlling the clamping force of the drive assembly during swing arm rotation detection, this invention provides a swing arm rotation detection method and system.

[0005] In a first aspect, the present invention provides a method for detecting the rotation of a swing arm, the method comprising:

[0006] Triggered by the swing arm rotation detection command, the swing arm is moved onto the movable seat assembly to reach the initial state; wherein, the initial state includes the swing arm being positioned and clamped on the movable seat assembly;

[0007] The drive assembly clamps one end of the swing arm's swing rod unit;

[0008] The synchronization component abuts against the outer peripheral wall of the swing arm unit;

[0009] The drive component drives the rocker arm unit to rotate around the central axis of the rocker arm unit to obtain first rotation data;

[0010] The rotation of the swing arm unit drives the rotation of the synchronization component to obtain the second rotation data;

[0011] Based on the first rotation data and the second rotation data, the rotation detection result of the swing arm is obtained.

[0012] In some embodiments, the swing arm includes a swing rod unit and a connecting arm unit; the swing rod unit includes a swing rod body and a swing ball; the swing rod body is connected to the swing ball; the connecting arm unit includes a connecting arm seat and a rivet ring; the connecting arm seat is configured as a housing with one open end; the rivet ring is connected to the connecting arm seat; the rivet ring is disposed at the open end of the connecting arm seat; the swing ball is disposed within the enclosing space of the connecting arm seat and the rivet ring; the swing rod body passes through the enclosing space of the inner peripheral wall of the rivet ring;

[0013] The drive assembly that holds one end of the swing arm's swing rod unit includes:

[0014] The movable seat assembly adjusts the swing arm to a first set state; wherein, the first set state includes the swing arm swinging relative to the rivet ring, such that the minimum distance between the set protrusion position of the rivet ring and the swing arm in the radial direction of the swing arm is less than or equal to a first set distance; the set protrusion position includes the position where the distance between one axial end of the rivet ring and the drive assembly along the axial direction of the rivet ring is the smallest;

[0015] The drive assembly clamps the outer periphery of the swing arm.

[0016] In some embodiments, the driving component includes a clamping unit and a ring probe; the clamping unit is slidably connected to the ring probe.

[0017] The movable seat assembly adjusts the swing arm to the first preset state by:

[0018] The movable seat assembly adjusts the swing arm to a second set state; wherein, the second set state includes the axial direction of the rivet ring of the swing arm being parallel to the axial direction of the ring probe of the drive assembly;

[0019] The ring probe moves to abut against one axial end of the riveting ring;

[0020] The ring probe rotates around the central axis of the rivet ring by a first set angle to obtain the set protrusion position; wherein, the first set angle is greater than or equal to 360°; the set protrusion position includes the position where the distance between one axial end of the rivet ring and the clamping unit along the axial direction of the rivet ring is the smallest;

[0021] The clamping unit of the drive assembly clamps one end of the swing arm's swing rod unit;

[0022] The movable seat assembly moves the set protrusion position of the rivet ring toward the swing arm body closer to the swing arm unit to a first set state.

[0023] In some embodiments, the swing arm further includes a ball seat unit; the ball seat unit includes a ball seat body and a second oil reservoir; the ball seat body is configured as a housing with one end open; the second oil reservoir is recessed from the bottom end of the opening of the ball seat body toward a direction away from the opening of the ball seat body; the ball seat body is disposed within the space enclosed by the connecting arm seat and the riveting ring; the outer peripheral surface of the ball seat body is connected to the inner peripheral wall of the connecting arm seat; the inner peripheral wall of the ball seat body is slidably connected to the swing ball;

[0024] The swing arm unit also includes a clearance portion; the clearance portion is recessed from the end of the swing ball away from the swing arm body toward the swing arm body;

[0025] The first setting state also includes at least a portion of the avoidance portion being disposed within the surrounding space of the inner peripheral wall of the ball seat.

[0026] In some embodiments, the movable seat assembly adjusts the swing arm to a second preset state by:

[0027] The clamping unit clamps the outer peripheral surface of the swing arm body;

[0028] The clamping unit drives the swing arm to rotate around its own axis;

[0029] Based on the clamping unit driving the swing arm to rotate around its own axis by a second set angle, the movable seat assembly adjusts the swing arm to a second set state.

[0030] In some embodiments, the ball seat unit further includes a plurality of first oil storage chambers; the first oil storage chambers extend from the outer peripheral surface of the ball seat body to the inner peripheral surface of the ball seat body; the plurality of first oil storage chambers are arranged sequentially at intervals around the central axis of the ball seat body;

[0031] The second set angle is greater than any third set angle; wherein, the third set angle is the minimum included angle between the lines connecting the two adjacent first oil storage chambers and the central axis of the ball seat body along the axial direction of the ball seat body.

[0032] In some embodiments, the first rotation data includes a minimum starting torque and a minimum rotation torque; wherein, the minimum starting torque is the minimum torque required for the drive assembly to drive the rocker arm unit from rest to the point where the rocker arm unit and the synchronization assembly rotate simultaneously;

[0033] The minimum rotational torque is the minimum torque required for the drive assembly to drive the rocker arm unit and the synchronization assembly to rotate simultaneously from a fourth set angle to a fifth set angle; wherein the fourth set angle is greater than 0° and less than the fifth set angle; and the fifth set angle is greater than 360°.

[0034] In a second aspect, the present invention provides a swing arm rotation detection system, wherein the swing arm rotation detection system is applied to any of the swing arm rotation detection methods in the first aspect, and the swing arm rotation detection system comprises:

[0035] The swing arm includes a swing rod unit and a connecting arm unit; one end of the swing rod unit is slidably connected to the connecting arm unit, and the other end extends away from the connecting arm unit.

[0036] A movable seat assembly is used to fix the connecting arm unit;

[0037] A synchronization component is used to detect whether the swing arm unit is rotating;

[0038] A drive assembly is used to drive the rocker arm unit to rotate about its own axis;

[0039] The detection states of the swing arm rotation detection system include: the movable seat assembly fixing the connecting arm unit, the drive assembly driving the swing arm unit to rotate and acquiring first rotation data, and the synchronization assembly abutting against the outer peripheral wall of the swing arm unit and acquiring second rotation data.

[0040] In some embodiments, the rocker arm unit includes a rocker arm body and a rocker ball; the rocker arm body is connected to the rocker ball; the connecting arm unit includes a connecting arm seat and a rivet ring; the connecting arm seat is configured as a housing with one open end; the rivet ring is connected to the connecting arm seat; the rivet ring is disposed at the open end of the connecting arm seat; the rocker ball is disposed within the enclosing space of the connecting arm seat and the rivet ring; the rocker arm body passes through the enclosing space of the inner peripheral wall of the rivet ring;

[0041] The movable seat assembly includes a movable seat unit and a tilting unit; the tilting unit is driven to be connected to the movable seat unit; the movable seat unit is used to fix the connecting arm seat;

[0042] The driving assembly includes a clamping unit and a ring probe; the clamping unit is slidably connected to the ring probe; the clamping unit is used to drive the swing arm to rotate around its own axis; the ring probe is used to detect the rivet ring;

[0043] The adjustment states of the swing arm rotation detection system include: the movable seat unit fixes the connecting arm unit; after the ring probe abuts against one axial end of the rivet ring, it rotates around the central axis of the rivet ring by a first set angle and obtains a set protrusion position; subsequently, the sway unit adjusts the swing arm to a first set state through the movable seat unit; wherein, the first set state includes a minimum distance between the set protrusion position of the rivet ring and the swing arm body in the radial direction of the swing arm body that is less than or equal to a first set distance; the set protrusion position includes the position where the distance between one axial end of the rivet ring and the clamping unit along the axial direction of the rivet ring is the smallest; and the first set angle is greater than or equal to 360°.

[0044] In some embodiments, the swing arm further includes a ball seat unit; the ball seat unit includes a ball seat body and a second oil storage cavity; the ball seat body is configured as a shell with one end open; the second oil storage cavity is recessed from the bottom end of the opening of the ball seat body toward a direction away from the opening of the ball seat body; the ball seat body is disposed within the space enclosed by the connecting arm seat and the riveting ring; the outer peripheral surface of the ball seat body is connected to the inner peripheral wall of the connecting arm seat; the inner peripheral wall of the ball seat body is slidably connected to the swing ball;

[0045] The swing arm unit also includes a clearance portion; the clearance portion is recessed from the end of the swing ball away from the swing arm body toward the swing arm body;

[0046] The first setting state also includes at least a portion of the avoidance portion being disposed within the surrounding space of the inner peripheral wall of the ball seat.

[0047] To address the problem of difficulty in controlling the clamping force of the drive assembly during swing arm rotation detection, this invention offers the following advantages:

[0048] Triggered by the swing arm rotation detection command, the swing arm is moved onto the movable seat assembly to achieve an initial state including positioning and clamping. This fixes the relative position of the swing arm and the movable seat assembly, maintaining the stability of the swing arm during rotation detection and providing a stable foundation for subsequent detection. The drive assembly clamps one end of the swing arm's swing rod unit, and the synchronization assembly abuts against the outer peripheral wall of the swing rod unit, allowing the synchronization assembly to rotate with the swing rod unit. The state of the synchronization assembly can then be used to determine whether the swing rod unit is effectively driven. The drive assembly drives the swing rod unit to rotate around its central axis to obtain first rotational data including the drive assembly's rotational speed and output driving torque. The rotation of the swing rod unit drives the synchronization assembly to rotate, obtaining second rotational data including the synchronization assembly's rotational speed. Based on the first and second rotational data, the swing arm rotation detection result is obtained, allowing for the determination of the validity of the first rotational data. This allows for adjustment of the drive assembly's clamping force on the swing rod unit, ultimately solving the problems of insufficient clamping force preventing the swing rod unit from being driven and excessive clamping force damaging the swing rod unit. This efficiently obtains accurate swing arm rotation detection results while avoiding damage to the swing rod unit. Attached Figure Description

[0049] Figure 1 A schematic diagram of a swing arm rotation detection method according to one embodiment is shown;

[0050] Figure 2 A first-view schematic diagram of a swing arm rotation detection system according to an embodiment is shown;

[0051] Figure 3 A second-view schematic diagram of a swing arm rotation detection system according to one embodiment is shown;

[0052] Figure 4 It shows Figure 3 A magnified view of a portion of the image;

[0053] Figure 5 A schematic diagram of the swing arm of a swing arm rotation detection system according to one embodiment is shown;

[0054] Figure 6 A schematic cross-sectional view of the swing arm of an embodiment of the swing arm rotation detection system is shown.

[0055] Figure 7 A schematic diagram of the ball seat unit of a swing arm rotation detection system according to one embodiment is shown;

[0056] Figure 8 A schematic cross-sectional view of the ball seat unit of a swing arm rotation detection system according to one embodiment is shown.

[0057] Reference numerals: 10 Movable seat assembly; 11 Movable seat unit; 111 Movable seat body; 112 First positioning part; 113 Second positioning part; 114 Third positioning part; 12 Swing unit; 121 First drive part; 122 Second drive part; 123 Third drive part; 20 Ring pressing assembly; 21 Pressing ring; 22 Fourth drive part; 30 Synchronization assembly; 31 Detector; 32 Synchronization pulley; 33 Synchronization belt; 40 Drive assembly; 41 Drive Moving unit; 411 Vertical moving part; 412 Rotating part; 42 Clamping unit; 421 Clamping seat; 422 Clamping head; 43 Ring probe; 50 Swing arm; 51 Ball seat unit; 511 Ball seat body; 512 First oil storage chamber; 513 Second oil storage chamber; 52 Swing rod unit; 521 Swing rod body; 522 Swing ball; 523 Avoiding part; 53 Connecting arm unit; 531 Connecting arm seat; 532 Riveting ring; 533 First connecting arm; 534 Second connecting arm. Detailed Implementation

[0058] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0059] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0060] The swing arm 50 rotation detection system, applied to the swing arm 50 rotation detection method, includes a swing arm 50, a movable seat assembly 10, a synchronization assembly 30, and a drive assembly 40. The swing arm 50 includes a swing rod unit 52 and a connecting arm unit 53; one end of the swing rod unit 52 is slidably connected to the connecting arm unit 53, and the other end extends away from the connecting arm unit 53; the movable seat assembly 10 is used to fix the connecting arm unit 53; the synchronization assembly 30 is used to detect whether the swing rod unit 52 rotates; and the drive assembly 40 is used to drive the swing rod unit 52 to rotate around its own axis.

[0061] During the rotation detection of the swing arm 50, the swing rod unit 52 of the swing arm 50 needs to be driven to rotate around its central axis by the drive assembly 40 to obtain relevant detection data. This process presents significant technical challenges. Currently, the common detection method involves only clamping the outer circumferential surface of the swing rod unit 52 by the drive assembly 40 before driving the swing rod unit 52 to rotate. Since the rotation of the swing rod unit 52 depends on the clamping and driving force transmission of the drive assembly 40, the clamping force of the drive assembly 40 directly affects the feasibility of the detection process and the integrity of the swing rod unit 52. If the clamping force of the drive assembly 40 is set too low, the resulting friction is insufficient to drive the swing rod unit 52 to rotate synchronously, resulting in ineffective driving of the swing rod unit 52 and affecting the normal operation of the detection work. If the clamping force is set too high to ensure driving effect, the excessive clamping force will act on the outer circumferential wall of the swing rod unit 52, easily damaging the outer circumferential surface of the swing rod unit 52 and affecting its subsequent performance.

[0062] Example 1: This example discloses a method for detecting the rotation of a 50-degree swing arm, such as... Figure 1 As shown, the method for detecting the rotation of the swing arm 50 includes steps S10 to S60, and each step is described in detail below:

[0063] Step S10: Based on the rotation detection command of the swing arm 50, the swing arm 50 is moved onto the movable seat assembly 10 to reach the initial state, which can fix the relative position of the swing arm 50 and the movable seat assembly 10, thereby maintaining the stability of the swing arm 50 during the rotation detection process; wherein, the initial state includes the swing arm 50 being positioned and clamped on the movable seat assembly 10.

[0064] In step S20, the drive assembly 40 clamps one end of the swing arm unit 52 of the swing arm 50;

[0065] In step S30, the synchronization component 30 abuts against the outer peripheral wall of the rocker arm unit 52. When the rocker arm unit 52 rotates around its own axis, the rocker arm unit 52 can drive the synchronization component 30 to rotate, thereby determining whether the rocker arm unit 52 is effectively driven by the drive component 40 based on the rotation speed of the synchronization component 30.

[0066] In step S40, the drive assembly 40 drives the swing arm unit 52 to rotate around the central axis of the swing arm unit 52, and obtains the first rotation data. The first rotation data may be the rotation speed of the drive assembly 40 around its own central axis and the driving torque output by the drive assembly 40.

[0067] In step S50, the rocker arm unit 52 rotates, causing the synchronization component 30 to rotate, and the second rotation data is obtained. The second rotation data can be the rotational speed of the synchronization component 30.

[0068] Step S60: Based on the first rotation data and the second rotation data, obtain the rotation detection result of the swing arm 50. When the ratio of the rotational speed of the drive component 40 of the first rotation data around its own central axis to the rotational speed of the synchronization component 30 of the second rotation data is a preset ratio or equal to it, the first rotation data can be judged as valid, and then the rotation detection result of the swing arm 50 is obtained based on the first rotation data. This method can efficiently obtain whether the swing arm unit 52 is effectively driven by the drive component 40 through the synchronization component 30, thereby adjusting the clamping force of the drive component 40 on the swing arm unit 52, and thus efficiently obtaining the rotation detection result of the swing arm 50 without damaging the swing arm unit 52. When the driving torque output by the drive component 40 is within the set qualified range, the rotation detection of the swing arm 50 is considered qualified.

[0069] Furthermore, such as Figure 5 , Figure 6 As shown, the control arm 50 includes a control rod unit 52 and a connecting arm unit 53; the control rod unit 52 includes a control rod body 521 and a swing ball 522; the control rod body 521 is connected to the swing ball 522; the connecting arm unit 53 includes a connecting arm seat 531 and a rivet ring 532; the connecting arm seat 531 is configured as a housing with one end open; the rivet ring 532 is connected to the connecting arm seat 531; the rivet ring 532 is located at the open end of the connecting arm seat 531; the swing ball 522 is located within the enclosing space of the connecting arm seat 531 and the rivet ring 532, and the rivet ring 532 can prevent the swing ball 522 from separating from the enclosing space of the connecting arm seat 531, so that the swing ball 522 only rotates within the enclosing space of the connecting arm seat 531 and the rivet ring 532; the control rod body 521 passes through the enclosing space of the inner peripheral wall of the rivet ring 532, and the control rod body 521 can be used to connect with the steering knuckle of the vehicle;

[0070] Step S20 includes steps S21 to S22, and each step is described in detail below: Steps S10, S21, S22, S30, S40, S50 and S60 are executed in sequence.

[0071] Step S21, the movable seat assembly 10 adjusts the swing arm 50 to a first set state; wherein, the first set state includes the swing arm 521 swinging relative to the rivet ring 532, such that the minimum distance between the set protrusion position of the rivet ring 532 and the minimum distance between the swing arm 521 in the radial direction of the swing arm 521 is less than or equal to a first set distance, the first set distance can be 3mm, 5mm, or 7mm; the set protrusion position includes the position where the distance between the end of the rivet ring 532 near the drive assembly 40 and the drive assembly 40 along the axial direction of the rivet ring 532 is the smallest, i.e. Figure 2 The riveting ring 532 shown is at the closest position to the drive assembly 40 in the vertical direction;

[0072] In step S22, the drive assembly 40 clamps the outer periphery of the swing arm body 521. To ensure the stability of the connection between the swing arm unit 52 and the ball seat unit 51, it is usually necessary to use the driving torque output by the drive assembly 40 to detect whether the minimum resistance of the relative rotation of the swing arm unit 52 and the ball seat unit 51 is within the set acceptable range. The force between the set protrusion of the rivet ring 532 and the swing ball 522 is small, and the resistance between the swing ball 522 and the set protrusion during rotation is small. After the swing arm 50 is adjusted to the first set state, the swing ball 522 moves away from the set protrusion, thereby further reducing the force between the set protrusion of the rivet ring 532 and the swing ball 522. At this time, if the drive assembly 40 drives the swing arm unit 52 to rotate around its own axis, more accurate first rotation data can be measured, namely the minimum driving torque output by the drive assembly 40 to drive the swing arm unit 52 to rotate and the rotation speed of the drive assembly 40 around its own central axis.

[0073] Furthermore, such as Figure 2 , Figure 3 , Figure 5 As shown, the drive assembly 40 includes a clamping unit 42 and a ring probe 43; the clamping unit 42 and the ring probe 43 are slidably connected.

[0074] Step S21 includes steps S211 to S215, and each step is described in detail as follows: Steps S10, S211, S212, S213, S214, S215, S22, S30, S40, S50 and S60 are executed in sequence.

[0075] In step S211, the movable seat assembly 10 adjusts the swing arm 50 to the second set state; wherein, the second set state includes the axial direction of the rivet ring 532 of the swing arm 50 being parallel to the axial direction of the ring probe 43 of the drive assembly 40, and the rivet ring 532 being leveled, thereby facilitating the subsequent steps.

[0076] In step S212, the ring probe 43 moves to abut against one axial end of the riveting ring 532;

[0077] Step S213: The ring probe 43 rotates around the central axis of the riveting ring 532 by a first set angle to obtain the set protrusion position; wherein, the first set angle is greater than or equal to 360°; the set protrusion position includes the position where the distance between one axial end of the riveting ring 532 and the clamping unit 42 along the axial direction of the riveting ring 532 is the smallest, which can be determined based on the direction in which the ring probe 43 moves away from the riveting ring 532 during the rotation of the ring probe 43 around the central axis of the riveting ring 532 (i.e., as...). Figure 2 The position of the set protrusion is obtained by moving the rivet ring 532 to the position of the abutment ring probe 43 when it moves the maximum distance in the upward direction (as shown). This setting method can obtain an accurate set protrusion position at a lower cost.

[0078] In step S214, the clamping unit 42 of the drive assembly 40 clamps one end of the swing arm unit 52 of the swing arm 50;

[0079] In step S215, the movable seat assembly 10 moves the set protrusion position of the rivet ring 532 toward the direction of the swing arm body 521 closer to the swing arm unit 52 to the first set state, further reducing the force between the set protrusion position of the rivet ring 532 and the swing ball 522. At this time, the drive assembly 40 drives the swing arm unit 52 to rotate around its own axis, and more accurate first rotation data can be measured, that is, the minimum driving torque output by the drive assembly 40 to drive the swing arm unit 52 to rotate and the rotation speed of the drive assembly 40 around its own central axis.

[0080] Furthermore, such as Figure 6 , Figure 8 As shown, the swing arm 50 also includes a ball seat unit 51; the ball seat unit 51 includes a ball seat body 511 and a second oil reservoir 513; the ball seat body 511 is configured as a shell with one end open for holding the swing ball 522; the second oil reservoir 513 extends from the bottom end of the opening of the ball seat body 511 (the bottom end can be as follows). Figure 8 The lower end shown points away from the opening of the ball seat 511 (i.e., as shown below). Figure 8 (As shown, in the downward direction) recessed; the ball seat 511 is disposed within the space enclosed by the connecting arm seat 531 and the rivet ring 532; the second oil storage cavity 513 can be used to store lubricant; after the lubricant adheres to the outer peripheral wall of the swing ball 522 and / or the inner peripheral wall of the ball seat 511, it can reduce the resistance between the swing ball 522 and the ball seat 511; the outer peripheral surface of the ball seat 511 is connected to the inner peripheral wall of the connecting arm seat 531; the hardness of the ball seat 511 can be weaker than that of the connecting arm seat 531 and the swing ball 522 respectively; after the swing arm 50 is assembled, the ball seat 511 can reduce the damage to the ball seat 511 and the swing ball 522 during use; the inner peripheral wall of the ball seat 511 is slidably connected to the swing ball 522;

[0081] The rocker arm unit 52 also includes a clearance portion 523; the clearance portion 523 is recessed from the end of the rocker arm 522 away from the rocker arm body 521 toward the rocker arm body 521, providing space for accommodating lubricant;

[0082] The first setting state also includes at least a portion of the avoidance part 523 being disposed within the enclosing space of the inner peripheral wall of the ball seat body 511, thereby reducing the contact area between the ball seat body 511 and the swing ball 522, reducing the resistance to the relative rotation of the ball seat body 511 and the swing ball 522, and sufficiently reducing the minimum driving torque output by the drive assembly 40 to drive the swing arm unit 52 to rotate, thereby obtaining a more accurate rotation detection result of the swing arm 50.

[0083] Further, step S211 includes steps S2111 to S2113, and each step is described in detail as follows: steps S10, S2111, S2112, S2113, S212, S213, S214, S215, S22, S30, S40, S50, and S60 are executed sequentially.

[0084] Step S2111: Clamping unit 42 clamps the outer peripheral surface of swing arm body 521;

[0085] In step S2112, the clamping unit 42 drives the swing arm 521 to rotate around its own axis;

[0086] In step S2113, based on the clamping unit 42 driving the swing arm 521 to rotate around its own axis by a second preset angle, the movable seat assembly 10 adjusts the swing arm 50 to the second preset state. The second preset angle is the rotation angle of the clamping unit 42. The process of the clamping unit 42 driving the swing arm 521 to rotate around its own axis by the second preset angle is just a lubrication process. Slippage may occur when the clamping unit 42 drives the swing arm 521, but this is not a measurement process, and the effect of slight slippage is negligible. A lubricant is provided between the outer peripheral wall of the swing ball 522 and the inner peripheral wall of the ball seat 511. Before the swing arm 50 is adjusted to the second set state, the drive swing rod 521 rotates around its own axis by a second set angle, which allows the lubricant to be fully coated on the outer peripheral wall of the swing ball 522 and the inner peripheral wall of the ball seat 511 as much as possible. This further reduces the resistance between the outer peripheral wall of the swing ball 522 and the inner peripheral wall of the ball seat 511, thereby reducing the minimum driving torque output by the drive assembly 40 to drive the swing rod unit 52 to rotate, and thus obtaining a more accurate rotation detection result of the swing arm 50.

[0087] Furthermore, such as Figure 7 , Figure 8 As shown, the ball seat unit 51 also includes a plurality of first oil storage chambers 512; the first oil storage chambers 512 extend from the outer peripheral surface of the ball seat body 511 to the inner peripheral surface of the ball seat body 511; the plurality of first oil storage chambers 512 are arranged sequentially at intervals around the central axis of the ball seat body 511; the first oil storage chambers 512 can store lubricant to reduce the resistance between the outer peripheral wall of the swing ball 522 and the inner peripheral wall of the ball seat body 511.

[0088] The second set angle is greater than any third set angle; wherein, the third set angle is the smallest included angle between the projections of the lines connecting the two adjacent first oil storage chambers 512 to the central axis of the ball seat 511 along the axial direction of the ball seat 511. After rotating the second set angle, the lubricant in the first oil storage chamber 512 can fully adhere to the outer peripheral wall of the swing ball 522 and the inner peripheral wall of the ball seat 511, thereby reducing the resistance between the swing ball 522 and the ball seat 511. This arrangement, while ensuring sufficient lubrication of the swing ball 522 and the ball seat 511, allows the clamping unit 42 to rotate around the central axis of the swing rod 521 by the smallest possible angle, achieving the effect of improving efficiency and reducing energy consumption.

[0089] Furthermore, the first rotation data includes the minimum starting torque and the minimum rotation torque; wherein, the minimum starting torque is the minimum torque at which the drive assembly 40 drives the rocker arm unit 52 from rest to the point where the rocker arm unit 52 and the synchronization assembly 30 rotate simultaneously, that is, the minimum torque output by the drive assembly 40 when the outer circumferential surface of the swing ball 522 and the inner circumferential surface of the ball seat 511 rub against each other statically;

[0090] The minimum rotational torque is the minimum torque required for the drive assembly 40 to simultaneously drive the rocker arm unit 52 and the synchronization assembly 30 to rotate between a fourth and a fifth set angle. Specifically, it is the minimum torque output by the drive assembly 40 when the outer circumferential surface of the rocker ball 522 and the inner circumferential surface of the ball seat 511 experience dynamic friction. The fourth set angle is greater than 0° and less than the fifth set angle; the fifth set angle is greater than 360°. By measuring the minimum starting torque and the minimum rotational torque, it is possible to more accurately determine whether the connection between the rocker ball 522 and the ball seat 511, and the connection between the ball seat 511 and the rocker ball 522, is sufficiently stable.

[0091] Example 2: This example provides a swing arm 50 rotation detection system. The swing arm 50 rotation detection system is applied to any of the swing arm 50 rotation detection methods described in the above examples, such as... Figure 2 , Figure 3 , Figure 4 As shown, the swing arm 50 rotation detection system may include a swing arm 50, a movable seat assembly 10, a synchronization assembly 30, and a drive assembly 40.

[0092] The control arm 50 includes a control rod unit 52 and a connecting arm unit 53; one end of the control rod unit 52 is slidably connected to the connecting arm unit 53, and the other end extends away from the connecting arm unit 53; the end of the control rod unit 52 away from the connecting arm unit 53 can be used to connect to the steering knuckle of the vehicle, and the end of the connecting arm unit 53 away from the control rod unit 52 can be used to connect to the body of the vehicle.

[0093] The movable seat assembly 10 is used to fix the connecting arm unit 53, so as to position and clamp the connecting arm unit 53 during the rotation detection of the swing arm 50.

[0094] The synchronization component 30 is used to detect whether the rocker arm unit 52 rotates around the central axis of the rocker arm unit 52.

[0095] The drive assembly 40 is used to drive the rocker arm unit 52 to rotate around its own axis.

[0096] The detection state of the swing arm 50 rotation detection system includes the movable seat assembly 10 positioning and clamping the connecting arm unit 53, fixing the relative position of the connecting arm unit 53 and the movable seat assembly 10, and the drive assembly 40 clamping the outer peripheral wall of the swing arm unit 52 to drive the swing arm unit 52 to rotate and acquire the first rotation data. At this time, the synchronization assembly 30 needs to abut against the outer peripheral wall of the swing arm unit 52 and acquire the second rotation data. The first rotation data can be the rotational speed of the drive assembly 40 around its own central axis and the driving torque output by the drive assembly 40. The second rotation data can be the rotational speed of the synchronization assembly 30. This setting method can detect whether the swing arm unit 52 is effectively driven by the drive assembly 40 through the synchronization assembly 30, thereby realizing the rotation detection of the swing arm 50 without damaging the swing arm unit 52.

[0097] Furthermore, such as Figure 5 , Figure 6 As shown, the rocker arm unit 52 includes a rocker arm body 521 and a rocker ball 522; the rocker arm body 521 is connected to the rocker ball 522; the connecting arm unit 53 includes a connecting arm seat 531 and a rivet ring 532; the connecting arm seat 531 is configured as a housing with one end open, which facilitates the installation of the rocker ball 522 into the space surrounded by the inner peripheral wall of the connecting arm seat 531; the rivet ring 532 is connected to the connecting arm seat 531; the rivet ring 532 is located at the open end of the connecting arm seat 531; the rocker ball 522 is located within the space surrounded by the connecting arm seat 531 and the rivet ring 532, so that the connecting arm seat 531 and the rivet ring 532 together restrict the range of motion of the rocker ball 522; the rocker arm body 521 passes through the space surrounded by the inner peripheral wall of the rivet ring 532, so that the rocker arm body 521 is used to connect the steering knuckle of the vehicle.

[0098] like Figure 2 As shown, the movable seat assembly 10 includes a movable seat unit 11 and a tilting unit 12; the tilting unit 12 is driven to connect with the movable seat unit 11; the movable seat unit 11 can be used to position and clamp the connecting arm seat 531, and the tilting unit 12 can adjust the angle of the central axis of the rivet ring 532 on the movable seat unit 11 through the movable seat unit 11.

[0099] like Figure 4 As shown, the drive assembly 40 includes a clamping unit 42 and a ring probe 43; the clamping unit 42 is slidably connected to the ring probe 43, and the ring probe 43 can move along its own axis; the clamping unit 42 is used to drive the rocker arm 521 to rotate around its own axis; the ring probe 43 is used to detect the side of the rivet ring 532 near the clamping unit 42.

[0100] The adjustment state of the swing arm 50 rotation detection system includes the movable seat unit 11 positioning and clamping the connecting arm unit 53, fixing the relative position of the movable seat unit 11 and the connecting arm unit 53, and rotating the ring probe 43 around the central axis of the rivet ring 532 by a first set angle after abutting one end of the axial direction and obtaining the set protrusion position. Subsequently, the sway unit 12 adjusts the swing arm 50 to the first set state through the movable seat unit 11. The first set state includes the minimum distance between the set protrusion position of the rivet ring 532 and the swing arm body 521 in the radial direction of the swing arm body 521 being less than or equal to the first set distance. The set protrusion position includes the position where the distance between the axial end of the rivet ring 532 and the clamping unit 42 along the axial direction of the rivet ring 532 is the smallest. The set protrusion position can be obtained based on the position where the ring probe 43 abuts the ring probe 43 on the rivet ring 532 when the ring probe 43 moves the maximum distance away from the rivet ring 532 during the rotation of the ring probe 43 around the central axis of the rivet ring 532 by a first set angle. The first set angle is greater than or equal to 360°. This configuration reduces the force between the set protrusion of the rivet ring 532 and the swing ball 522. After that, the drive assembly 40 drives the swing arm unit 52 to rotate around its own axis, thus obtaining more accurate first rotation data.

[0101] Furthermore, such as Figure 7 , Figure 8 As shown, the swing arm 50 also includes a ball seat unit 51; the ball seat unit 51 includes a ball seat body 511 and a second oil reservoir 513; the ball seat body 511 is configured as a shell with one end open; the second oil reservoir 513 is recessed from the bottom end of the opening of the ball seat body 511 toward a direction away from the opening of the ball seat body 511; the ball seat body 511 is disposed within the space enclosed by the connecting arm seat 531 and the rivet ring 532, and the second oil reservoir 513 can be used to store lubricant, which adheres to the outer peripheral wall of the swing ball 522 and / or the ball seat. The inner peripheral wall of the ball seat 511 reduces the resistance between the sway ball 522 and the ball seat 511; the outer peripheral surface of the ball seat 511 is connected to the inner peripheral wall of the connecting arm seat 531; the hardness of the ball seat 511 can be weaker than that of the connecting arm seat 531 and the sway ball 522 respectively. After the rocker arm 50 is assembled, the ball seat 511 can reduce the damage to the ball seat 511 and the sway ball 522 during use; the inner peripheral wall of the ball seat 511 is slidably connected to the sway ball 522, which can realize the flexible rotation of the steering knuckle.

[0102] The rocker arm unit 52 also includes a clearance portion 523; the clearance portion 523 is recessed from the end of the rocker arm 522 away from the rocker arm body 521 toward the rocker arm body 521, providing space for accommodating lubricant. When the clearance portion 523 moves relative to the ball seat body 511, the clearance portion 523 can also allow the lubricant to move, thereby forming a larger lubrication area on the inner circumferential surface of the ball seat body 511.

[0103] The first setting state also includes at least a portion of the avoidance part 523 being located within the surrounding space of the inner peripheral wall of the ball seat body 511. This method allows the ball seat body 511 to have a smaller contact area with the swing ball 522, thus significantly reducing the minimum driving torque output by the drive assembly 40 to drive the swing arm unit 52 to rotate, thereby obtaining more accurate rotation detection results of the swing arm 50.

[0104] Furthermore, such as Figure 5 As shown, the connecting arm unit 53 may further include a first connecting arm 533 and a second connecting arm 534; one end of the first connecting arm 533 is connected to the connecting arm seat 531, and the other end extends away from the connecting arm seat 531. One end of the second connecting arm 534 is connected to the connecting arm seat 531, and the other end extends away from the first connecting arm 533. The first connecting arm 533 and the second connecting arm 534 are respectively spaced apart from the rivet ring 532. After the swing arm 50 is assembled with the vehicle, the connecting arm seat 531 can be slidably connected to the vehicle body through the first connecting arm 533 and the second connecting arm 534 respectively. Figure 3 As shown, the movable seat unit 11 includes a movable seat body 111, a first positioning part 112, a second positioning part 113, and a third positioning part 114; the first positioning part 112, the second positioning part 113, and the third positioning part 114 are respectively connected to the movable seat body 111; the first positioning part 112 is used to position and clamp the connecting arm seat 531, the second positioning part 113 is used to position and clamp the first connecting arm 533, and the third positioning part 114 is used to position and clamp the second connecting arm 534, thereby maintaining the stability of the swing arm 50 during the rotation detection process and improving the accuracy of the detection results. Figure 2 As shown, the sway unit 12 includes a first drive unit 121, a second drive unit 122, and a third drive unit 123; the first drive unit 121, the second drive unit 122, and the third drive unit 123 can be driven connected to the movable seat 111 respectively. The first drive unit 121 is disposed adjacent to the first positioning unit 112, the second drive unit 122 is disposed adjacent to the second positioning unit 113, and the third drive unit 123 is disposed adjacent to the third positioning unit 114, thereby controlling the positions of the first positioning unit 112, the second positioning unit 113, and the third positioning unit 114 according to a predetermined program during the rotation detection of the swing arm 50, thereby changing the position of the central axis of the rivet ring 532. Figure 3 , Figure 4As shown, the synchronization component 30 includes a detector 31, a synchronization pulley 32, and a synchronization belt 33. Part of the synchronization belt 33 can be fitted onto the outer peripheral wall of a portion of the synchronization pulley 32, and another portion can be fitted onto the outer peripheral wall of a portion of the detector 31. During the rotation detection process of the swing arm 50, the synchronization belt 33, which abuts against the synchronization pulley 32, can abut against the outer peripheral wall of the swing arm body 521. When the drive component 40 drives the swing arm body 521 to rotate around its own axis, the swing arm body 521 can drive the synchronization pulley 32 to rotate via the synchronization belt 33. The synchronization pulley 32 then drives the detector 31 to rotate via the synchronization belt 33. The rotational speed of the detector 31 around its own axis can be the second rotational data. The drive component 40 also includes a drive unit 41; the drive unit 41 includes a vertical displacement part 411 and a rotating part 412; the clamping unit 42 includes a clamping seat 421, a drive part, and multiple clamping heads 422. The clamping seat 421 is drivenly connected to the rotating part 412 and the vertical moving part 411 respectively. The clamping seat 421 can move along the central axis of the clamping seat 421 and can also rotate around the central axis of the clamping seat 421. The clamping head 422 is movably connected to the clamping seat 421. The driving part is drivenly connected to the clamping head 422. The clamping head 422 can move towards or away from the central axis of the clamping seat 421. The clamping seat 421 is slidably connected to the ring measuring head 43. The clamping head 422 can be sleeved on the outer periphery of the swing rod body 521 under the drive of the vertical moving part 411 and the rotating part 412, and then the driving part drives the clamping head 422 to clamp the outer periphery of the swing rod body 521.

[0105] In other embodiments, the swing arm 50 rotation detection system may further include a ring clamping assembly 20; the ring clamping assembly 20 includes a clamping ring 21 and a fourth drive unit 22; the fourth drive unit 22 may be connected to the movable seat 111; the fourth drive unit 22 may be driven to connect with the clamping ring 21. When the movable seat unit 11 positions and clamps the connecting arm unit 53, the fourth drive unit 22 may drive the clamping ring 21 to move to abut against the side of the swing arm body 521 away from the movable seat 111, so that the clamping ring 21 applies a force to the swing arm body 521 in the direction of the movable seat unit 11, so that the movable seat unit 11 and the clamping ring 21 jointly position and clamp the connecting arm unit 53.

[0106] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A method for detecting the rotation of a swing arm, characterized in that, The swing arm rotation detection method includes: Triggered by a swing arm rotation detection command, the swing arm is moved onto the movable seat assembly to reach an initial state; wherein, the initial state includes the swing arm being positioned and clamped on the movable seat assembly; The drive assembly clamps one end of the swing arm's swing rod unit; The synchronization component abuts against the outer peripheral wall of the swing arm unit; The drive component drives the rocker arm unit to rotate around the central axis of the rocker arm unit to obtain first rotation data; The rotation of the swing arm unit drives the rotation of the synchronization component to obtain the second rotation data; Based on the first rotation data and the second rotation data, the swing arm rotation detection result is obtained; wherein, when the ratio of the rotational speed of the drive component around its own central axis in the first rotation data to the rotational speed of the synchronization component in the second rotation data is a preset ratio or equal to it, the first rotation data is determined to be valid, and the swing arm rotation detection result is obtained based on the first rotation data.

2. The method for detecting the rotation of a swing arm according to claim 1, characterized in that, The swing arm includes a swing rod unit and a connecting arm unit; the swing rod unit includes a swing rod body and a swing ball; the swing rod body is connected to the swing ball; the connecting arm unit includes a connecting arm seat and a riveting ring; the connecting arm seat is configured as a housing with one open end; the riveting ring is connected to the connecting arm seat; the riveting ring is located at the open end of the connecting arm seat; the swing ball is located within the enclosing space of the connecting arm seat and the riveting ring; the swing rod body passes through the enclosing space of the inner peripheral wall of the riveting ring; The drive assembly that holds one end of the swing arm's swing rod unit includes: The movable seat assembly adjusts the swing arm to a first set state; wherein, the first set state includes the swing arm swinging relative to the rivet ring, such that the minimum distance between the set protrusion position of the rivet ring and the swing arm in the radial direction of the swing arm is less than or equal to a first set distance; the set protrusion position includes the position where the distance between one axial end of the rivet ring and the drive assembly along the axial direction of the rivet ring is the smallest; The drive assembly clamps the outer periphery of the swing arm.

3. The method for detecting the rotation of a swing arm according to claim 2, characterized in that, The driving assembly includes a clamping unit and a ring probe; the clamping unit is slidably connected to the ring probe. The movable seat assembly adjusts the swing arm to the first preset state by: The movable seat assembly adjusts the swing arm to a second set state; wherein, the second set state includes the axial direction of the rivet ring of the swing arm being parallel to the axial direction of the ring probe of the drive assembly; The ring probe moves to abut against one axial end of the riveting ring; The ring probe rotates around the central axis of the rivet ring by a first set angle to obtain the set protrusion position; wherein, the first set angle is greater than or equal to 360°; the set protrusion position includes the position where the distance between one axial end of the rivet ring and the clamping unit along the axial direction of the rivet ring is the smallest; The clamping unit of the drive assembly clamps one end of the swing arm's swing rod unit; The movable seat assembly moves the set protrusion position of the rivet ring toward the swing arm body closer to the swing arm unit to a first set state.

4. The method for detecting the rotation of a swing arm according to claim 3, characterized in that, The swing arm further includes a ball seat unit; the ball seat unit includes a ball seat body and a second oil storage cavity; the ball seat body is configured as a shell with one end open; the second oil storage cavity is recessed from the bottom end of the opening of the ball seat body toward a direction away from the opening of the ball seat body; the ball seat body is disposed within the space enclosed by the connecting arm seat and the riveting ring; the outer peripheral surface of the ball seat body is connected to the inner peripheral wall of the connecting arm seat; the inner peripheral wall of the ball seat body is slidably connected to the swing ball; The swing arm unit also includes a clearance portion; the clearance portion is recessed from the end of the swing ball away from the swing arm body toward the swing arm body; The first setting state also includes at least a portion of the avoidance portion being disposed within the surrounding space of the inner peripheral wall of the ball seat.

5. The method for detecting the rotation of a swing arm according to claim 4, characterized in that, The movable seat assembly adjusts the swing arm to the second preset state by: The clamping unit clamps the outer peripheral surface of the swing arm body; The clamping unit drives the swing arm to rotate around its own axis; Based on the clamping unit driving the swing arm to rotate around its own axis by a second set angle, the movable seat assembly adjusts the swing arm to a second set state.

6. The method for detecting the rotation of a swing arm according to claim 5, characterized in that, The ball seat unit further includes a plurality of first oil storage chambers; the first oil storage chambers extend from the outer peripheral surface of the ball seat body to the inner peripheral surface of the ball seat body; the plurality of first oil storage chambers are arranged at intervals around the central axis of the ball seat body; The second set angle is greater than any third set angle; wherein, the third set angle is the minimum included angle between the lines connecting the two adjacent first oil storage chambers and the central axis of the ball seat body along the axial direction of the ball seat body.

7. The method for detecting the rotation of a swing arm according to claim 6, characterized in that, The first rotation data includes the minimum starting torque and the minimum rotation torque; wherein, the minimum starting torque is the minimum torque required for the drive assembly to drive the rocker arm unit from rest to the point where the rocker arm unit and the synchronization assembly rotate simultaneously; The minimum rotational torque is the minimum torque required for the drive assembly to drive the rocker arm unit and the synchronization assembly to rotate simultaneously from a fourth set angle to a fifth set angle; wherein the fourth set angle is greater than 0° and less than the fifth set angle; and the fifth set angle is greater than 360°.

8. A swing arm rotation detection system, characterized in that, The swing arm rotation detection system is applied to a swing arm rotation detection method according to any one of claims 1-7, and the swing arm rotation detection system comprises: The swing arm includes a swing rod unit and a connecting arm unit; one end of the swing rod unit is slidably connected to the connecting arm unit, and the other end extends away from the connecting arm unit. A movable seat assembly is used to fix the connecting arm unit; A synchronization component is used to detect whether the swing arm unit is rotating; A drive assembly is used to drive the rocker arm unit to rotate about its own axis; The detection states of the swing arm rotation detection system include: the movable seat assembly fixing the connecting arm unit, the drive assembly driving the swing arm unit to rotate and acquiring first rotation data, and the synchronization assembly abutting against the outer peripheral wall of the swing arm unit and acquiring second rotation data.

9. The swing arm rotation detection system according to claim 8, characterized in that, The swing arm unit includes a swing arm body and a swing ball; the swing arm body is connected to the swing ball; the connecting arm unit includes a connecting arm seat and a riveting ring; the connecting arm seat is a housing with one open end; the riveting ring is connected to the connecting arm seat; the riveting ring is located at the open end of the connecting arm seat; the swing ball is located within the enclosing space of the connecting arm seat and the riveting ring; the swing arm body passes through the enclosing space of the inner peripheral wall of the riveting ring; The movable seat assembly includes a movable seat unit and a tilting unit; the tilting unit is driven to be connected to the movable seat unit; the movable seat unit is used to fix the connecting arm seat; The driving assembly includes a clamping unit and a ring probe; the clamping unit is slidably connected to the ring probe; the clamping unit is used to drive the swing arm to rotate around its own axis; The ring probe is used to detect the rivet ring; The adjustment states of the swing arm rotation detection system include: the movable seat unit fixes the connecting arm unit; after the ring probe abuts against one axial end of the rivet ring, it rotates around the central axis of the rivet ring by a first set angle and obtains a set protrusion position; subsequently, the sway unit adjusts the swing arm to a first set state through the movable seat unit; wherein, the first set state includes a minimum distance between the set protrusion position of the rivet ring and the swing arm body in the radial direction of the swing arm body that is less than or equal to a first set distance; the set protrusion position includes the position where the distance between one axial end of the rivet ring and the clamping unit along the axial direction of the rivet ring is the smallest; and the first set angle is greater than or equal to 360°.

10. The swing arm rotation detection system according to claim 9, characterized in that, The swing arm further includes a ball seat unit; the ball seat unit includes a ball seat body and a second oil storage cavity; the ball seat body is configured as a shell with one end open; the second oil storage cavity is recessed from the bottom end of the opening of the ball seat body toward a direction away from the opening of the ball seat body; the ball seat body is disposed within the space enclosed by the connecting arm seat and the riveting ring; the outer peripheral surface of the ball seat body is connected to the inner peripheral wall of the connecting arm seat; the inner peripheral wall of the ball seat body is slidably connected to the swing ball; The swing arm unit also includes a clearance portion; the clearance portion is recessed from the end of the swing ball away from the swing arm body toward the swing arm body; The first setting state also includes at least a portion of the avoidance portion being disposed within the surrounding space of the inner peripheral wall of the ball seat.

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