An overload adjusting mechanism and a spare tire basket fixing mechanism

Abstract

An overload adjusting mechanism and a spare tire basket fixing mechanism belong to the technical field of automobile parts. The overload adjusting mechanism comprises a fixing assembly, a locking disc arranged in the fixing assembly, ball pin positioning holes arranged on the locking disc, a ball pin sliding groove on the upper surface of the locking disc, a connecting screw rod connected with the locking disc, a locking shaft member having a locking shaft body and a base, a plurality of ball pin accommodating holes on the base, a ball pin installed in the ball pin accommodating hole and capable of being inserted into the ball pin positioning hole, the ball pin being capable of sliding along the ball pin sliding groove, an adjusting nut sleeved on the locking shaft body, a butterfly spring abutting between the base and the adjusting nut, the spare tire basket fixing mechanism comprising at least one overload adjusting mechanism, a spare tire basket body and a suspension unit, the spare tire basket body being used for carrying a spare tire, and the suspension unit being connected with the connecting screw rod. The advantages are that the spare tire locking overload protection is realized, the stable and reliable release of the spare tire is ensured, the structure is compact, and the safety is good.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts technology, specifically relating to an overload adjustment mechanism and a spare tire basket mounting and fixing mechanism. Background Technology

[0002] Tires, as a crucial component of vehicles, play a vital role in their normal operation. Tire problems during driving can lead to difficulties in driving the entire vehicle, or even render it immobile. This is especially true for medium and large vehicles such as off-road vehicles, RVs, and light trucks, whose long driving distances, heavy weight, and complex road conditions exacerbate tire wear and increase the likelihood of tire blowouts. To address this issue, many medium and large vehicles are now equipped with spare tires to prevent tire problems from affecting driving. In designing the spare tire's placement, OEMs typically mount it securely under the vehicle's chassis frame. Generally, the spare tire carrier is hinged to the chassis. After the spare tire is stored in the carrier, a hook connects it to the carrier, and a locking device secures the hook and carrier to maintain the spare tire's position. When in use, the locking device is released to rotate the carrier and retrieve the spare tire. The locking device is the core component of the entire spare tire carrier mechanism, requiring a certain locking force to secure the spare tire and prevent it from shifting. To prevent excessive locking force from interfering with the spare tire and damaging it, the locking mechanism must have overload protection. Furthermore, since the entire spare tire carrier is constantly exposed to air and subjected to water spray and gravel impacts, the locking mechanism is highly likely to rust. This means that when the spare tire needs to be removed, a torque greater than that applied initially to the locking mechanism must be applied, meaning the release torque will be greater than the locking torque. This makes removing and placing the spare tire very inconvenient and poses a risk that the spare tire may become impossible to remove after long-term storage.

[0003] Chinese patent document CN212473701U describes a spare tire carrier and a car, including a spare tire carrier body, a spare tire locking assembly, a switch assembly, a first mounting base, and a second mounting base. The spare tire carrier body includes a first connecting portion and a second connecting portion, with a recessed groove formed in the middle of the body to accommodate the spare tire. The spare tire locking assembly is used to lock the spare tire and is installed on the spare tire carrier body and disposed at the bottom of the groove. The first mounting base is hinged to the first connecting portion. The second connecting portion can be selectively connected to the second mounting base via the switch assembly to lock or unlock the second connecting portion. It has the advantages of meeting the installation needs of users with large-size spare tires and ensuring the reliability of the connection between the spare tire carrier body and the vehicle body. However, it still cannot solve the problems mentioned above, such as damage to the spare tire after overload and a series of problems caused by the release torque of the locking mechanism exceeding the locking torque after long-term use, thus failing to meet user needs. Patent CN108674501A discloses a horizontally rotating spare tire rack, which locks the spare tire with two buckles set at the top and bottom. However, it has problems with high cost and poor reliability. Furthermore, the two spare tires cannot be opened and closed independently, resulting in low efficiency and large space occupation.

[0004] In view of the above, it is necessary to design a locking device and a spare tire carrier that have overload protection, can ensure the unloading and release of the spare tire even after rusting occurs, and have excellent waterproof sealing performance. To this end, the applicant has conducted active and effective research, resulting in the technical solution described below. Summary of the Invention

[0005] The primary objective of this invention is to provide a compact, reliable, durable, and waterproof overload adjustment mechanism. This mechanism helps to effectively protect the spare tire from overload by setting a ball head pin sliding groove on the locking disc and equipping it with a ball head pin that can slide within it. This prevents damage to the spare tire due to excessive locking force. Furthermore, it facilitates the stable and reliable release of the spare tire in the event of rust by achieving rigid contact between the ball head pin and the locking disc.

[0006] Another objective of the present invention is to provide a spare tire basket mounting and fixing mechanism that can be connected in conjunction with an overload adjustment mechanism to achieve fixed installation of the spare tire while ensuring reliable and stable connection.

[0007] To accomplish the primary task, the technical solution provided by this invention is: an overload adjustment mechanism for locking and releasing a spare tire basket, characterized by comprising: a fixing assembly having a fixing plate and a fixing housing mounted on the fixing plate; a locking disc disposed at the bottom of the inner cavity of the fixing housing and rotatably connected to the fixing plate, wherein a plurality of ball-head pin positioning holes are evenly spaced along the circumference of the locking disc, and a plurality of ball-head pin sliding grooves communicating with the ball-head pin positioning holes are formed on the upper surface of the locking disc, and the plurality of ball-head pin sliding grooves gradually narrow from the ball-head pin positioning holes to the upper surface of the locking disc along the circumferential direction of the locking disc, wherein the ball-head pin sliding groove is disposed on one side of the ball-head pin positioning hole and extends obliquely upward from the ball-head pin positioning hole and narrows to the upper surface of the locking disc, and the other end of the ball-head pin sliding groove away from the ball-head pin positioning hole is close to an adjacent ball-head pin positioning hole; and a connecting screw, wherein the top of the connecting screw... The end portion of the locking shaft is inserted into the center of the locking disc and connected to the locking disc; a locking shaft is positioned above the locking disc, and the locking shaft has a locking shaft body and a base formed at one axial end of the locking shaft body, while a locking hole is formed at the other axial end of the locking shaft body. Multiple ball-head pin receiving holes are provided on the base at positions corresponding to the multiple ball-head pin positioning holes; multiple ball-head pins are respectively installed in their corresponding ball-head pin receiving holes, and the ball-head pins can extend downwards into the ball-head pin positioning holes, and the lower end of the ball-head pins can slide along the ball-head pin sliding groove; an adjusting nut is fitted onto the upper part of the locking shaft body, and the adjusting nut can reciprocate on the locking shaft body; a butterfly spring is fitted onto the locking shaft body and abuts against the base and the adjusting nut, and the butterfly spring can apply a downward force to the locking shaft.

[0008] In a specific embodiment of the present invention, a plurality of mounting holes are provided on the mounting plate of the fixing component, and the fixing plate can be fixedly installed on the upper part of the vehicle floor frame by fasteners passing through the mounting holes. A fixing plate mating hole is also provided at the center of the fixing plate, and a locking plate mating sleeve is protruding at the center of the downward-facing surface of the locking disc. The shape of the locking plate mating sleeve is adapted to the fixing plate mating hole, and the locking plate mating sleeve can be fitted into the fixing plate mating hole, thereby realizing the rotational connection between the locking disc and the fixing plate.

[0009] In another specific embodiment of the present invention, a locking sleeve is formed by protruding upward at the center of the upward-facing surface of the locking disc. The connecting screw passes upward through the locking disc body and into the locking sleeve. A cylindrical pin is fitted in the locking sleeve. The cylindrical pin is arranged laterally and passes through the rod of the connecting screw. Both ends of the cylindrical pin in the length direction are fitted into the locking sleeve. The cylindrical pin is fixedly connected to the locking sleeve, thereby realizing the connection between the connecting screw and the locking disc.

[0010] In another specific embodiment of the present invention, a fixed housing cavity is formed inside the fixed housing, and the locking disc, locking shaft, adjusting nut and butterfly spring are all housed in the fixed housing cavity; and a rubber protective cover capable of sealing the inside of the fixed housing cavity is also installed on the top of the fixed housing.

[0011] In another specific embodiment of the present invention, the ball joint pin includes a ball joint ball and a ball joint rod body. The ball joint ball is formed at one end of the ball joint rod body. The ball joint rod body is fitted into the ball joint receiving hole of the locking shaft. The ball joint ball can extend downward into the ball joint positioning hole and be connected thereto. The ball joint ball can move from the ball joint positioning hole to the ball joint sliding groove and slide along the ball joint sliding groove.

[0012] In another specific embodiment of the present invention, the locking hole of the locking shaft is an internal hexagonal screw hole.

[0013] To accomplish another task, the technical solution provided by this invention is: a spare tire basket mounting and fixing mechanism, including at least one of the above-mentioned overload adjustment mechanisms, and further including: a spare tire basket body, the spare tire basket body being used to carry a spare tire, and one end of the spare tire basket body in the length direction being hinged to the vehicle floor frame; multiple suspension units, the suspension units being disposed at the other end of the spare tire basket body in the length direction away from its hinged part with the vehicle floor frame, the overload adjustment mechanism being disposed at the upper position corresponding to the suspension unit, and the suspension unit including a threaded sleeve and a hook, the threaded sleeve being vertically disposed at the lower position of the vehicle floor frame, and the hook being fixedly installed at the bottom of the threaded sleeve, and the hook being able to hook the end of the spare tire basket body and realize the lifting of the spare tire basket body, and the connecting screw being able to pass downward through the vehicle floor frame and connect with the threaded sleeve.

[0014] In a further specific embodiment of the present invention, the spare tire basket body includes a spare tire support frame and multiple reinforcing frames. The spare tire support frame has two parallel and oppositely arranged support frame side beams and a support frame connecting crossbeam connected between the front parts of the support frame side beams. The reinforcing frames are connected and fixed between the two support frame side beams, and the hooks can hook onto the support frame connecting crossbeam. On the side of the support frame side beam away from the support frame connecting crossbeam, a support frame rear boom is bent upwards, and a support frame hinge rod is bent at the top end of the support frame rear boom. Both support frame hinge rods are also fitted with a hinge plate, which is fixedly installed below the vehicle floor frame. The support frame hinge rod is hinged to the hinge plate, thereby realizing the hinge connection between the spare tire basket body and the vehicle floor frame.

[0015] In yet another specific embodiment of the present invention, a side limiting frame is also connected to the two side beams of the support frame. The side limiting frame is vertically arranged and used to limit the spare tire placed in the spare tire support frame.

[0016] In yet another specific embodiment of the present invention, a disc-shaped upper gasket is fitted near the top end of the threaded sleeve body, and a sealing sleeve is provided at the top of the threaded sleeve. The sealing sleeve has a hollow bowl-shaped structure, and the bottom end of the sealing sleeve abuts against the upper gasket of the threaded sleeve, while the top end of the sealing sleeve abuts against the lower surface of the vehicle body floor frame.

[0017] Due to the aforementioned structure, this invention offers the following advantages compared to existing technologies: First, by creating a ball-head pin positioning hole and a ball-head pin sliding groove on the locking disc, during the process of locking the spare tire (i.e., rotating the locking shaft), the ball-head pin is positioned within the ball-head pin positioning hole. The ball-head pin drives the locking disc and connecting screw to rotate, thereby causing the suspension unit to move upward and lock the spare tire basket. At this stage, the pressure of the disc spring is greater than the tension force on the locking disc and connecting screw. As the locking shaft continues to rotate, with the upward movement of the connecting screw... The torque required for rotation will increase. When the tension on the locking shaft and connecting screw exceeds the compressive force of the disc spring, continued rotation of the locking shaft will cause the ball head pin to move from the ball head pin positioning hole into the ball head pin sliding groove and slide along the groove. If the locking shaft continues to rotate, the ball head pin will pass the highest point of the ball head pin sliding groove and contact the upper surface of the locking disc, then fall into the next adjacent ball head pin positioning hole. At this point, the locking disc and connecting screw will stop rotating. Continuing to rotate the locking shaft will cause the ball head pin to... The ball joint will continue to slide along the ball joint sliding groove, and the locking disc will not move, thus preventing the suspension unit from moving upward. This achieves overload protection during the spare tire locking process, preventing excessive locking force from damaging the spare tire and improving reliability and safety. Second, when releasing the spare tire, since the ball joint sliding groove is unidirectionally located on one side of the ball joint positioning hole, during the reverse rotation of the locking shaft, the ball joint and the inner circumferential sidewall of the ball joint positioning hole are in rigid contact. Through the rotation of the locking shaft, the ball joint drives the locking disc and the connecting screw to rotate, thereby realizing the overall descent of the suspension unit to release the spare tire basket. Even if the internal parts of the locking mechanism are rusted, the unloading torque required for the spare tire basket is greater than the overload torque during locking, and it can still be unloaded smoothly, improving reliability and ensuring stability during unloading. Third, a rubber protective cover is installed on the fixed housing, and a sealing sleeve is fitted on the upper part of the threaded sleeve. These provide good sealing protection for the various components inside the fixed housing cavity and the connection between the threaded sleeve and the connecting screw, demonstrating superior waterproof protection performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overload adjustment mechanism in this invention;

[0019] Figure 2 This is an exploded three-dimensional view of the overload adjustment mechanism in this invention;

[0020] Figure 3 This is a schematic diagram of the structure of the locking disc and locking shaft in this invention;

[0021] Figure 4 This is a schematic diagram of the spare tire basket fixing mechanism in this invention;

[0022] Figure 5 This is an application example diagram of the present invention.

[0023] In the diagram: 1. Fixing component, 11. Fixing plate, 111. Fixing plate mounting hole, 112. Fixing plate mating hole, 12. Fixing housing, 121. Fixing housing inner cavity, 122. Rubber protective cover; 2. Locking disc, 21. Ball pin positioning hole, 22. Ball pin sliding groove, 23. Locking disc mating sleeve, 24. Locking disc locking sleeve, 241. Cylindrical pin; 3. Connecting screw; 4. Locking shaft, 41. Locking shaft body, 411. Locking hole, 42. Base, 421. Ball pin receiving hole; 5. Ball head 51. Ball head pin body; 52. Ball head pin rod body; 6. Adjusting nut; 7. Butterfly spring; 8. Spare tire basket body; 81. Spare tire support frame; 811. Support frame side beam; 812. Support frame connecting crossbeam; 813. Support frame rear boom; 814. Support frame hinge rod; 815. Support frame side limit frame; 82. Reinforcing frame body; 83. Hinge plate; 9. Suspension unit; 91. Threaded sleeve; 911. Threaded sleeve upper washer; 92. Hook piece; 93. Sealing sleeve; 10. Vehicle body floor frame. Detailed Implementation

[0024] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of the present invention should be considered within the scope of protection of the present invention.

[0025] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back are based on the positions shown in the corresponding figures, and therefore should not be construed as a special limitation on the technical solutions provided by this invention.

[0026] Please see Figures 1 to 3 This paper illustrates an overload adjustment mechanism for locking and releasing a spare tire basket. It includes a fixing assembly 1, which has a fixing plate 11 and a fixing housing 12 mounted on the fixing plate 11. The fixing plate 11 and the fixing housing 12 are fixedly connected by fasteners passing through them. A locking disc 2 is disposed at the bottom of the inner cavity of the fixing housing 12 and rotatably connected to the fixing plate 11. The locking disc 2 has a plurality of ball-head pin positioning holes 21 evenly spaced along its circumference. Multiple ball-pin sliding grooves 22, communicating with the ball-pin positioning hole 21, are formed on the upper surface of the locking disc 2. These grooves gradually narrow from the ball-pin positioning hole 21 to the upper surface of the locking disc 2 along the circumferential direction of the disc. The aforementioned ball-pin sliding grooves 22 are located on one side of the ball-pin positioning hole 21 and extend obliquely upwards from the ball-pin positioning hole 21, narrowing to the upper surface of the locking disc 2. The other end of the ball-pin sliding groove 22, away from the ball-pin positioning hole 121, is close to an adjacent ball-pin positioning hole 21. Figure 2 As shown, the ball pin sliding groove 22 is arranged in a clockwise direction, and the number of both the ball pin positioning hole 21 and the ball pin sliding groove 22 is six. Of course, the number is not limited to this, and relevant manufacturers can make corresponding changes according to actual needs.

[0027] Specifically, the overload adjustment mechanism also includes a connecting screw 3, the top end of which passes through the center of the aforementioned locking disc 2 and connects with the locking disc 2; a locking shaft 4, positioned above the aforementioned locking disc 2, and the locking shaft 4 having a locking shaft body 41 and a base 42 formed at one axial end of the locking shaft body 41, the aforementioned locking shaft body 41 and the base 42 being integrally formed, and a locking hole 411 being formed at the other axial end of the aforementioned locking shaft body 41, and a plurality of ball head pin receiving holes 421 being formed on the aforementioned base 42 at positions corresponding to the plurality of ball head pin positioning holes 21; a plurality of ball head pins 5, the plurality of ball head pins 5 being respectively installed in their respective corresponding ball head pin receiving holes 421, the ball head pins 5 can be inserted downward into the ball head pin positioning hole 21, and the lower end of the aforementioned ball head pin 5 can slide along the ball head pin sliding groove 22; Adjusting nut 6, the adjusting nut 6 is fitted on the upper part of the locking shaft body 41, and the adjusting nut 6 can reciprocate on the locking shaft body 41; Disc spring 7, the disc spring 7 is fitted on the aforementioned locking shaft body 41 and abuts against the aforementioned base 42 and the adjusting nut 6, the disc spring 7 can apply a downward force to the locking shaft 4. It should be noted that the operator can adjust the position of the adjusting nut 6 to adjust the initial deformation of the disc spring 7, and adjust the initial pressure applied by the disc spring 7 to the locking shaft 4, thereby realizing the initial setting of the pressure when locking the spare tire.

[0028] It should be noted that during overload protection, the ball head pin 5 will move along the axis of the ball head pin sliding groove 22. During this process, the ball head pin 5 will slowly climb. The maximum depth of the ball head pin sliding groove 22 is preferably about 0.5mm less than the ball head radius of the ball head pin 5. The rolling surface of the ball head pin sliding groove 22 needs to fit with the ball head pin 5 during the climbing process to ensure the stability of the ball head pin 5 during the sliding climbing process.

[0029] In this embodiment, a plurality of fixing plate mounting holes 111 are provided on the fixing plate 11 of the aforementioned fixing component 1. The aforementioned fixing plate 11 can be fixedly installed on the upper part of the vehicle floor frame by fasteners passing through the fixing plate mounting holes 111. A fixing plate mating hole 112 is also provided at the center of the fixing plate 11. A locking plate mating sleeve 23 is also protruding at the center of the lower-facing surface of the aforementioned locking disc 2. The shape of the locking disc mating sleeve 23 is adapted to the fixing plate mating hole 112, and the locking disc mating sleeve 23 can be mated and installed in the fixing plate mating hole 112, thereby realizing the rotational connection between the locking disc 2 and the fixing plate 11.

[0030] Furthermore, a locking disc locking sleeve 24 is formed by protruding upward at the center of the upward-facing surface of the aforementioned locking disc 2. The aforementioned connecting screw 3 passes upward through the body of the aforementioned locking disc 2 and into the locking disc locking sleeve 24. A cylindrical pin 241 is installed in the locking disc locking sleeve 24. The cylindrical pin 241 is arranged laterally and passes through the rod of the aforementioned connecting screw 3. Its two ends in the length direction are fitted and installed in the locking disc locking sleeve 24. The cylindrical pin 241 is fixedly connected to the locking disc locking sleeve 24, thereby realizing the connection between the aforementioned connecting screw 3 and the locking disc 2.

[0031] Please see Figure 1 and combined Figure 2 An inner cavity 121 is formed inside the aforementioned fixed housing 12, and the aforementioned locking disc 2, locking shaft 4, adjusting nut 6 and disc spring 7 are all housed in the inner cavity 121. A rubber protective cover 122 is also installed on the top of the aforementioned fixed housing 12 to seal the inside of the inner cavity 121. The rubber protective cover 122 can effectively seal and protect the various components inside the inner cavity 121, providing waterproof protection and preventing the internal structure from rusting.

[0032] Furthermore, the aforementioned ball pin 5 includes a ball pin body 51 and a ball pin rod body 52. ​​The ball pin body 51 is formed at one end of the ball pin rod body 52. ​​The ball pin rod body 52 is fitted into the ball pin receiving hole 421 of the aforementioned locking shaft 4. The ball pin body 51 can be inserted downward into the ball pin positioning hole 21 and connected thereto. The ball pin body 51 can move from the ball pin positioning hole 21 to the ball pin sliding groove 22 and slide along the ball pin sliding groove 22.

[0033] Furthermore, the locking hole 411 of the aforementioned locking shaft 4 is an internal hexagonal screw hole. By using an external hexagonal wrench in conjunction with the internal hexagonal screw hole 411, it is convenient to rotate the locking shaft 4 and adjust the locking disc 2 and the connecting screw 3.

[0034] Please see Figure 4 and Figure 5 The diagram shows a spare tire basket mounting and fixing mechanism, including the aforementioned overload adjustment mechanism, and further including: a spare tire basket body 8, which is used to carry the spare tire. Figure 5 The diagram also shows a vehicle chassis frame 10, with one end of the spare tire basket body 8 hinged to the vehicle chassis frame 10 along its length; it also includes multiple suspension units 9. Figure 4 and Figure 5 Two sets are shown. The aforementioned suspension unit 9 is located at the end of the aforementioned spare tire basket body 8, away from its hinge point with the vehicle floor frame 10 in the longitudinal direction. The aforementioned overload adjustment mechanism is located at the upper position corresponding to the suspension unit 9, and there are two overload adjustment mechanisms in total. The aforementioned suspension unit 9 includes a threaded sleeve 91 and a hook 92. The aforementioned threaded sleeve 91 is vertically located below the vehicle floor frame 10, and the aforementioned hook 92... hook The bottom of the threaded sleeve 91 is fixedly installed with component 92, and the hook component 92 can hook onto the end of the spare tire basket body 8 and lift the spare tire basket body 8. The aforementioned connecting screw 3 can pass downward through the vehicle floor frame 10 and be threadedly connected to the threaded sleeve 91. During the rotation of the aforementioned connecting screw 3, its bottom is threadedly engaged with the top of the threaded sleeve 91, so that the two can achieve mutual expansion and contraction.

[0035] Furthermore, the aforementioned spare tire basket body 8 includes a spare tire support frame 81 and multiple reinforcing frame bodies 82. The aforementioned spare tire support frame 81 has two parallel and oppositely arranged support frame side beams 811 and a support frame connecting crossbeam 812 connecting the front parts of the support frame side beams 811. The aforementioned reinforcing frame bodies 82 are connected and fixed between the two support frame side beams 811, and the aforementioned hook 92 can hook onto the support frame connecting crossbeam 812; while the aforementioned support frame side beams The side of 811 away from the aforementioned support frame connecting beam 812 is also bent upward to form a support frame rear boom 813, and a support frame hinge rod 814 is also bent at the top end of the support frame rear boom 813. Both support frame hinge rods 814 are also fitted with a hinge plate 83. The hinge plate 83 is fixedly installed below the vehicle body floor frame 10, and the aforementioned support frame hinge rod 814 is hinged to the hinge plate 83, thereby realizing the hinge connection between the spare tire basket body 8 and the vehicle body floor.

[0036] In this embodiment, a side limiting frame 815 is also connected to the two aforementioned side beams 811 of the support frame. The aforementioned side limiting frame 815 is vertically arranged and used to limit the spare tire placed in the spare tire support frame 81. When the spare tire is placed in the spare tire support frame 81, the side limiting frames 815 on both sides can effectively stop and limit the spare tire, prevent the spare tire from moving laterally, and ensure the reliable stability of the spare tire placement.

[0037] Furthermore, a disc-shaped upper washer 911 is fitted near the top end of the aforementioned threaded sleeve 91. A sealing sleeve 93 is also provided on the top of the threaded sleeve 91. The sealing sleeve 93 has a hollow bowl-shaped structure, and the bottom end of the sealing sleeve 93 abuts against the upper washer 911, while the top end of the sealing sleeve 93 abuts against the lower surface of the vehicle floor. During the locking process of the spare tire, the sealing sleeve 93 moves upward with the threaded sleeve 91 and tightly abuts against the lower surface of the vehicle floor frame 10 to achieve self-sealing, effectively protecting the threaded connection between the threaded sleeve 91 and the connecting screw 3.

[0038] Please see Figures 1 to 5The applicant briefly describes the working principle of the technical solution provided by this invention: When it is necessary to lock the spare tire, the user can insert an Allen wrench into the locking hole 411 of the locking shaft 4 and rotate the shaft 4 clockwise. The connecting screw 3 is connected and fixed to the locking disc 2. The ball head pin 5 is placed in the ball head pin positioning hole 21. The ball head pin 5 drives the locking disc 2 and the connecting screw 3 to rotate clockwise and drive the suspension unit 9 to move upward to lock the spare tire basket. Since at this initial stage, the pressure applied by the disc spring 7 to the locking disc 2 is greater than the tension on the connecting screw 3, the... Under the pressure of the disc spring 7, the locking shaft 4, ball pin 5, and locking disc 2 are connected together, thereby driving the suspension unit 9 to move upward to lock the spare tire. When the locking shaft 4 continues to rotate clockwise, as the connecting screw 3 moves upward, the torque required to overcome the compressive force of the disc spring 7 will increase. When it reaches a certain range, the tension on the locking shaft 4 and the connecting screw 3 is greater than the compressive force of the disc spring 7. If the locking shaft 4 continues to rotate, due to the upward movement of the locking shaft 4, the ball pin 5 will move from the ball pin positioning hole 21 into the ball pin slide. The ball head pin 5 slides along the ball head pin sliding groove 22. If the locking shaft 4 continues to rotate, the ball head pin 5 slowly slides and climbs, eventually passing the highest point of the ball head pin sliding groove 22 and contacting the upper surface of the locking disc 2. It will then fall into the next adjacent ball head pin positioning hole 21. At this point, there is no rigid contact between the locking disc 2 and the locking shaft 4, and the locking disc 2 and the connecting screw 3 will stop rotating. If the locking shaft 4 continues to rotate, the ball head pin 5 will continue to slide along the ball head pin sliding groove 22, and the locking disc 2 will not move, thus preventing the suspension unit from moving upward. This mechanism enables overload protection during the spare tire locking process, preventing excessive locking force from damaging the spare tire. When the spare tire needs to be removed, since the ball joint pin sliding groove 22 is unidirectionally located on one side of the ball joint pin positioning hole 21, during the reverse rotation of the locking shaft 4, the user uses an Allen wrench to turn the rotating shaft 4 counterclockwise. Because the ball joint pin 5 is in rigid contact with the inner circumferential sidewall of the ball joint pin positioning hole 21 opposite to the ball joint pin sliding groove 22, the ball joint pin 5 will drive the locking disc 2 and the connecting screw 3 to rotate counterclockwise, thereby realizing the overall descent of the suspension unit 9 to release the spare tire basket.

[0039] In summary, the technical solution provided by this invention makes up for the shortcomings of the prior art, successfully completes the invention task, and accurately realizes the technical effects described by the applicant in the above technical effects column.

Claims

1. An overload adjustment mechanism for locking and releasing a spare tire basket, characterized in that, The device includes: a fixing assembly (1), which has a fixing plate (11) and a fixing housing (12) mounted on the fixing plate (11); and a locking disc (2), which is disposed at the bottom of the inner cavity of the fixing housing (12) and rotatably connected to the fixing plate (11). The locking disc (2) has a plurality of ball-head pin positioning holes (21) evenly spaced along its circumference, and a plurality of holes communicating with the ball-head pin positioning holes are formed on the upper surface of the locking disc (2). The ball head pin sliding groove (22) of the hole (21) and multiple ball head pin sliding grooves (22) gradually narrow from the ball head pin positioning hole (21) to the upper surface of the locking plate (2) along the circumferential direction of the locking plate (2). The ball head pin sliding groove (22) is provided on one side of the ball head pin positioning hole (21) and the ball head pin sliding groove (22) extends obliquely upward from the ball head pin positioning hole (21) and narrows to the upper surface of the locking plate (2). The ball head pin sliding groove (22) is far away from the other side of the ball head pin positioning hole (21). One end is close to an adjacent ball-head pin positioning hole (21); a connecting screw (3), the top end of which passes through the center of the locking disc (2) and is connected to the locking disc (2); a locking shaft (4), which is located above the locking disc (2), and the locking shaft (4) has a locking shaft body (41) and a base (42) formed at one axial end of the locking shaft body (41), while at the other axial end of the locking shaft body (41) A locking hole (411) is also formed, and a plurality of ball pin receiving holes (421) are provided on the base (42) at positions corresponding to the plurality of ball pin positioning holes (21); a plurality of ball pins (5) are respectively installed in their respective ball pin receiving holes (421), the ball pins (5) can be inserted downward into the ball pin positioning holes (21), and the lower end of the ball pins (5) can slide along the ball pin sliding groove (22); Adjusting nut (6) is fitted on the upper part of locking shaft body (41) and can reciprocate on locking shaft body (41); butterfly spring (7) is fitted on locking shaft body (41) and abuts between base (42) and adjusting nut (6) and can apply downward force to locking shaft (4).

2. The overload adjustment mechanism according to claim 1, characterized in that: Multiple mounting holes (111) are provided on the mounting plate (11) of the fixing assembly (1). The mounting plate (11) can be fixedly installed on the upper part of the vehicle floor frame by fasteners passing through the mounting holes (111). A mounting plate mating hole (112) is also provided at the center of the mounting plate (11). A locking disc mating sleeve (23) is also protruding at the center of the lower side surface of the locking disc (2). The shape of the locking disc mating sleeve (23) is adapted to the mounting plate mating hole (112), and the locking disc mating sleeve (23) can be installed in the mounting plate mating hole (112), thereby realizing the rotational connection between the locking disc (2) and the mounting plate (11).

3. The overload adjustment mechanism according to claim 1, characterized in that: A locking sleeve (24) is formed by protruding upward at the center of the upper side surface of the locking disc (2). The connecting screw (3) passes upward through the body of the locking disc (2) and into the locking sleeve (24). A cylindrical pin (241) is installed in the locking sleeve (24). The cylindrical pin (241) is arranged laterally and passes through the rod of the connecting screw (3). Its two ends in the length direction are fitted into the locking sleeve (24). The cylindrical pin (241) is fixedly connected to the locking sleeve (24), thereby realizing the connection between the connecting screw (3) and the locking disc (2).

4. The overload adjustment mechanism according to claim 1, characterized in that: A fixed housing cavity (121) is formed inside the fixed housing (12), and the locking disc (2), locking shaft (4), adjusting nut (6) and butterfly spring (7) are all housed in the fixed housing cavity (121); and a rubber protective cover (122) that can seal the inside of the fixed housing cavity (121) is also installed on the top of the fixed housing (12).

5. The overload adjustment mechanism according to claim 1, characterized in that: The ball joint (5) includes a ball joint ball (51) and a ball joint rod (52). The ball joint ball (51) is formed at one end of the ball joint rod (52). The ball joint rod (52) is fitted into the ball joint receiving hole (421) of the locking shaft (4). The ball joint ball (51) can be inserted downward into the ball joint positioning hole (21) and connected with it. The ball joint ball (51) can move from the ball joint positioning hole (21) to the ball joint sliding groove (22) and slide along the ball joint sliding groove (22).

6. The overload adjustment mechanism according to claim 1, characterized in that: The locking hole (411) of the locking shaft (4) is an internal hexagonal screw hole.

7. A spare tire basket mounting and fixing mechanism, characterized in that: The system includes at least one overload adjustment mechanism as described in any one of claims 1 to 6, and further includes: a spare tire basket body (8) for carrying a spare tire, wherein one end of the spare tire basket body (8) in the length direction is hinged to the vehicle floor frame; a plurality of suspension units (9), wherein the suspension units (9) are disposed at the other end of the spare tire basket body (8) in the length direction away from its hinged portion with the vehicle floor frame, and the overload adjustment mechanism is disposed corresponding to the suspension units (9). At the upper position, the suspension unit (9) includes a threaded sleeve (91) and a hook (92). The threaded sleeve (91) is vertically arranged below the body floor frame, and the hook (92) is fixedly installed at the bottom of the threaded sleeve (91). The hook (92) can hook the end of the spare tire basket body (8) and lift the spare tire basket body (8). The connecting screw (3) can pass downward through the body floor frame and connect with the threaded sleeve (91).

8. The spare tire basket mounting and fixing mechanism according to claim 7, characterized in that: The spare tire basket body (8) includes a spare tire support frame (81) and multiple reinforcing frames (82). The spare tire support frame (81) has two parallel and opposite support frame side beams (811) and a support frame connecting beam (812) connecting the front parts of the support frame side beams (811). The reinforcing frames (82) are connected and fixed between the two support frame side beams (811). The hook (92) can hook onto the support frame connecting beam (812). 1) On the side away from the connecting beam (812) of the support frame, a rear boom (813) of the support frame is bent upward, and a support frame hinge rod (814) is bent at the top end of the rear boom (813). Both support frame hinge rods (814) are fitted with a hinge plate (83). The hinge plate (83) is fixedly installed below the body floor frame, and the support frame hinge rod (814) is hinged to the hinge plate (83), thereby realizing the hinge connection between the spare tire basket body (8) and the body floor frame.

9. The spare tire basket mounting and fixing mechanism according to claim 8, characterized in that: A side limit frame (815) is also connected to the two side beams (811) of the support frame. The side limit frame (815) is vertically arranged and used to limit the spare tire placed in the spare tire support frame (81).

10. The spare tire basket mounting and fixing mechanism according to claim 7, characterized in that: Near the top end of the threaded sleeve (91), a threaded sleeve upper washer (911) with a disc-shaped structure is also fitted. A sealing sleeve (93) is also provided on the top of the threaded sleeve (91). The sealing sleeve (93) has a hollow bowl-shaped structure. The bottom end of the sealing sleeve (93) abuts against the threaded sleeve upper washer (911), while the top end of the sealing sleeve (93) abuts against the lower surface of the vehicle body floor frame.

Images