Support base for a tow hitch

Abstract

The application discloses a support base for a towing seat, two ratchet wheels are arranged on corresponding supporting legs in a rotating mode, the rotating direction of the ratchet wheels is perpendicular to the rotating direction of a mounting plate; the inner end of two hanging arms is in contact with the peripheral part of the corresponding ratchet wheels, and the outer end extends to one side of the supporting leg; the outer end peripheral surface of the two hanging arms is arc-shaped and in contact with the side surface of the mounting plate close to the supporting leg; two groups of reset components are arranged in the middle part of the corresponding supporting legs and are identical in structure; the working end of the two groups of reset components is in mesh with the peripheral gear of the corresponding ratchet wheels. In the application, the arc-shaped outer end of the hanging arm is in contact with the side surface of the mounting plate, the ratchet wheel is rotated to drive the hanging arm to generate arc-shaped contact pressure, and the mechanical limiting of the rotating angle of the mounting plate is realized. The limiting of the mounting plate by the hanging arm is released by controlling the rotation of the ratchet wheel, a locking and releasing mechanism is formed, the unexpected displacement and abrasion caused by vibration are effectively inhibited, and the rotating function of the mounting plate is ensured.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and more particularly to a support base for a traction seat. Background Technology

[0002] Due to their advantages such as large transport capacity, convenience, speed, efficiency, and economy, tractor units have been a major product development focus for OEMs in recent years. As a crucial connecting device between the semi-trailer and the trailer, the reliability of the towing unit directly affects the driving safety of the semi-trailer.

[0003] In existing technology, a typical towing bracket includes two outriggers and a mounting plate. The bottoms of the two outriggers are fixedly connected to the mounting section at the rear of the vehicle, and the bottom of the mounting plate is rotatably mounted on the top of the two outriggers. The mounting plate itself rotates with the two outriggers, causing wear at the connection between the mounting plate and the outriggers. During vehicle operation, the vehicle vibrates, exacerbating the rotation of the mounting plate and the top of the outriggers, further increasing wear on the support plate and the two outriggers, and potentially increasing the gap at the connection between the mounting plate and the outriggers. This can lead to radial movement of the mounting plate, disrupting the stable connection between the mounting plate and the outriggers.

[0004] Therefore, there is an urgent need for a support base for traction seats to solve the above problems. Utility Model Content

[0005] This application provides a support base for a traction seat, which aims to constrain the rotational posture of the mounting plate during vehicle movement while ensuring a stable connection between the mounting plate and the outriggers.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] A support base for a traction seat includes two legs, two pivots, two pins, two ratchet wheels, two booms, and two sets of reset assemblies; The two outriggers are symmetrically spaced apart. The bottom of the two outriggers is fixedly connected to the vehicle body, and their tops are located inside the mounting plate and are in rotational engagement with the mounting plate. One end of each of the two rotating shafts passes through the outside of the mounting plate to the top of the corresponding support leg, and the other end slides in contact with the outer side of the mounting plate. One end of each of the two pins passes through the radial direction of the corresponding shaft, and the other end is fixedly connected to the circumferential surface of the shaft. Parts of the circumferential surfaces of the two pins slide in contact with the inner surface of the mounting plate. The two ratchet wheels are rotatably disposed at the middle of the corresponding legs, and the rotation direction of the ratchet wheels is perpendicular to the rotation direction of the mounting plate; The inner ends of the two booms are hinged to the periphery of the corresponding ratchet, and their outer ends extend to the side of the support leg near the mounting plate. The outer peripheral surfaces of the two booms are arc-shaped and abut against the side of the mounting plate near the support leg, forming a limiting fit. The two sets of reset components have the same structure and are placed in the middle of the corresponding support legs. The working ends of the two sets of reset components mesh with the corresponding ratchet circumferential gear, which can release the limiting position of the mounting plate and the two booms.

[0008] Furthermore, the reset assembly includes a connecting block, a connecting rod, a cam gear, and an elastic element; The connecting block is slidably disposed at the bottom of the corresponding boom, and the two sides of the connecting block in the width direction extend to the outer side of the opposite side of the boom; One end of the connecting rod is fixedly connected to the side of the connecting block away from the support leg in the width direction, and the other end extends toward the side where the corresponding ratchet is located, and is spaced above the ratchet; The cam gear is rotatably disposed at the end of the connecting rod away from the connecting block, and the circumferential surface of the cam gear at the point of highest curvature meshes with the circumferential surface of the corresponding ratchet.

[0009] One end of the elastic element is fixedly connected to the end of the connecting block near the connecting rod, and the other end is fixedly connected to the boom.

[0010] Furthermore, the boom includes a horizontal section and a curved section. One end of the horizontal section is hinged to the periphery of the ratchet, and the other end is close to the mounting plate. The bottom of the boom is recessed with a downward-facing groove for accommodating the connecting block. The longitudinal section of the groove is generally a convex shape with one wide section and one narrow section.

[0011] Furthermore, the connecting block has an overall I-shaped structure, with its top circumference embedded in the groove and slidably connected to the groove wall.

[0012] Furthermore, it also includes a guide rod, one end of which is fixedly connected to the end of the connecting rod away from the corresponding connecting block, and the other end of which is slidably connected to the circumferential surface of the support leg.

[0013] Furthermore, the connection points between the two legs and the corresponding guide rods are recessed with guide grooves for accommodating the guide rods, and the center of the guide grooves is in the same plane as the axis of the cam gear.

[0014] One or more technical solutions provided in the embodiments of this utility model have at least the following technical effects or advantages: In this application, the outriggers are symmetrically fixed to the vehicle body, with their tops rotatably connected to the inner side of the mounting plate. This allows the mounting plate to be supported by the top of the outriggers during rotation, reducing stress concentration at the connection point. A pivot shaft passes through the top of the outrigger and slides in contact with the outer side of the mounting plate. A pin is fixed radially along the pivot shaft and slides in contact with the inner side of the mounting plate, forming sliding constraints on both the inner and outer sides to limit the radial movement of the mounting plate. A ratchet is located in the middle of the outrigger and rotates perpendicular to the mounting plate. The ratchet's rotation causes the boom to generate contact pressure on the boom, mechanically limiting the rotation angle of the mounting plate. A reset assembly meshes with the ratchet gear. By controlling the ratchet's rotation, the boom's restriction on the mounting plate is released, forming an adjustable locking and releasing mechanism. This ensures the mounting plate's rotation function while effectively suppressing unexpected displacement and wear caused by vibration. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments of this utility model or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a structural schematic diagram of the assembled state provided in the embodiments of this application; Figure 2 This is a schematic diagram of the support leg provided in an embodiment of this application; Figure 3 for Figure 2 A magnified view of a portion of region A in the middle; Figure 4 This is a schematic diagram of the support leg and reset assembly provided in an embodiment of this application.

[0017] Icons: 1-Mounting plate; 10-Outrigger; 101-Guide groove; 11-Shaft; 12-Pin; 13-Ratchet; 14-Arm; 141-Horizontal section; 142-Bent section; 143-Slide groove; 20-Reset assembly; 21-Connecting block; 22-Connecting rod; 23-Piercing gear; 24-Elastic element; 25-Guide rod. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0019] In the description of the embodiments of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0020] Combination Figures 1-4 As shown, a support base for a traction seat includes two outriggers 10, two rotating shafts 11, two pins 12, two ratchet wheels 13, two booms 14, and two sets of reset assemblies 20. The two outriggers 10 are symmetrically spaced apart, with their bottoms fixedly connected to the vehicle body and their tops located inside a mounting plate 1, forming a rotatable engagement with the mounting plate 1. One end of each of the two rotating shafts 11 passes through the outer side of the mounting plate 1 to the top of the corresponding outrigger 10, and the other end slides in contact with the outer surface of the mounting plate 1. One end of each of the two pins 12 passes through the radial direction of the corresponding rotating shaft 11, and the other end is fixedly connected to the circumferential surface of the rotating shaft 11. A portion of the circumferential surface of each of the two pins 12 is in contact with the mounting plate 1. The inner surfaces slide in contact; the two ratchet wheels 13 are rotatably disposed in the middle of the corresponding support legs 10, and the rotation direction of the ratchet wheels 13 is perpendicular to the rotation direction of the mounting plate 1; the inner ends of the two booms 14 are hinged to the periphery of the corresponding ratchet wheels 13, and their outer ends extend to the side of the support leg 10 near the mounting plate 1. The outer peripheral surfaces of the two booms 14 are arc-shaped and abut against the side of the mounting plate 1 near the support leg 10, forming a limiting fit; the two sets of reset components 20 have the same structure and are placed in the middle of the corresponding support legs 10. The working ends of the two sets of reset components 20 mesh with the peripheral gears of the corresponding ratchet wheels 13, which can release the limiting fit between the mounting plate 1 and the two booms 14.

[0021] In the above scheme, it should be noted that the mounting plate 1 in this application is the medium for the vehicle body to tow the working end of the vehicle body to the external environment (tractor, trailer). The outriggers 10 are symmetrically fixed to the vehicle body, and their tops are rotatably connected to the inner side of the mounting plate 1, so that the mounting plate 1 is supported by the top of the outriggers 10 when it rotates, reducing stress concentration at the connection. The rotating shaft 11 passes through the top of the outrigger 10 and slides in contact with the outer side of the mounting plate 1. The pin 12 is fixed radially along the rotating shaft 11 and slides in contact with the inner side of the mounting plate 1, forming a sliding constraint on both the inner and outer sides, restricting the radial movement of the mounting plate 1. The ratchet 13 is located in the middle of the outrigger 10 and rotates perpendicular to the mounting plate 1. It abuts against the side of the mounting plate 1 through the outer arc surface of the boom 14. The rotation of the ratchet 13 drives the boom 14 to generate arc surface contact pressure, thereby achieving mechanical limitation of the rotation angle of the mounting plate 1. The reset assembly 20 meshes with the ratchet 13 gear, and by controlling the rotation of the ratchet 13, the limit of the boom 14 on the mounting plate 1 is released, forming an adjustable locking and releasing mechanism. While ensuring the rotation function of the mounting plate 1, it effectively suppresses unexpected displacement and wear caused by vibration.

[0022] The reset assembly 20 includes a connecting block 21, a connecting rod 22, a cam gear 23, and an elastic element 24. The connecting block 21 is slidably disposed on the bottom of the corresponding boom 14, and its two sides in the width direction extend to the outer sides of the opposite sides of the boom 14. One end of the connecting rod 22 is fixedly connected to the side of the connecting block 21 away from the support leg 10 in the width direction, and its other end extends towards the side where the corresponding ratchet 13 is located, and is spaced above the ratchet 13. The cam gear 23 is rotatably disposed on the end of the connecting rod 22 away from the connecting block 21, and the circumferential surface of the cam gear 23 at the highest curvature meshes with the circumferential surface of the corresponding ratchet 13. One end of the elastic element 24 is fixedly connected to the end of the connecting block 21 near the connecting rod 22, and its other end is fixedly connected to the boom 14.

[0023] In the above scheme, the connecting block 21 adopts a double-sided extending sliding structure. The design extending beyond the side of the boom 14 forms a guiding constraint, ensuring no deflection occurs during sliding. The connecting rod 22 connects to the side of the connecting block 21 away from the outrigger 10, forming a lever-type transmission structure. This amplifies and transmits the displacement of the operating end of the connecting rod 22 (the end away from the mounting plate 1) to the side where the ratchet 13 is located. The highest point of curvature of the cam gear 23 meshes with the teeth of the ratchet 13, creating a maximum transmission ratio at the moment of contact, enabling rapid disengagement of the ratchet 13 teeth. The elastic element 24 is installed using a slider linkage, storing reset potential energy through elastic deformation, and automatically returning to its initial state after the operation is released. The design of the guide rod 25 and the guide groove 101 ensures that the movement trajectory of the cam gear 23 remains coplanar with the axis of the ratchet 13, preventing axial misalignment during gear meshing.

[0024] The boom 14 includes a horizontal section 141 and a curved section 142. One end of the horizontal section 141 is hinged to the periphery of the ratchet 13, and the other end is close to the mounting plate 1. The bottom of the boom 14 is recessed with a downward-facing groove 143 for accommodating the connecting block 21. The longitudinal section of the groove 143 is generally a convex shape with one wide section and one narrow section.

[0025] In the above scheme, the horizontal section 141 of the boom 14 is hinged to the ratchet 13, enabling the boom 14 to transmit a stable torque during rotation and avoiding local stress concentration caused by rigid connection; the curved section 142 of the boom 14 ensures that the outer arc surface of the boom 14 forms an effective limiting fit with the side of the mounting plate 1. The convex longitudinal section structure of the slide groove 143 provides the initial embedding space of the connecting block 21 through the wide section and forms a guiding constraint through the narrow section, allowing the connecting block 21 to slide longitudinally along the slide groove 143 while restricting its lateral displacement, thereby preventing the connecting block 21 from disengaging from the slide groove 143 or getting stuck under dynamic working conditions. By setting the groove opening downwards, the slide groove 143 can effectively prevent external impurities from entering and reduce wear on the sliding surface.

[0026] In practice, the elastic element 24 is disposed within the wide section of the slide groove 143, and the circumferential surface of the elastic element 24 slides in contact with the inner wall of the wide section of the slide groove 143, so as to prevent the elastic element 24 from disengaging from the boom 14 during deformation and ensure that the connecting block 21 can stably return to the initial position.

[0027] The connecting block 21 has an overall I-shaped structure, and its top circumference is embedded in the sliding groove 143 and slidably connected to the groove wall of the sliding groove 143.

[0028] In the above scheme, the top circumferential surface of the connecting block 21 and the convex structure of the slide groove 143 form a geometric complement, so that the connecting block 21 can simultaneously bear longitudinal load and lateral constraint when sliding in the slide groove 143, and also restrict the offset of the connecting block 21 in the width direction, while allowing free sliding along the length direction of the slide groove 143.

[0029] It also includes a guide rod 25, one end of which is fixedly connected to the end of the connecting rod 22 away from the corresponding connecting block 21, and the other end of which is slidably connected to the circumferential surface of the support leg 10.

[0030] In the above scheme, the guide rod 25 has one end fixed to the end of the connecting rod 22, and the other end is slidably connected to the support leg 10, so that the connecting rod 22 can be oriented along the axial trajectory of the guide rod 25 when it drives the cam gear 23 to move. The fixed end of the guide rod 25 forms a rigid constraint with the connecting rod 22, which can effectively suppress the swing of the connecting rod 22 during lateral movement; the sliding end of the guide rod 25 forms a dynamic fit with the circumferential surface of the support leg 10, which allows the connecting rod 22 to move axially with the movement of the reset assembly 20, and can also limit the radial displacement of the connecting rod 22 through the solid structure of the support leg 10, ensuring that the cam gear 23 and the ratchet 13 always maintain a stable meshing state, while avoiding gear disengagement or meshing misalignment caused by the displacement of the connecting rod 22, thereby improving the reliability of the reset assembly 20 during operation.

[0031] The connection between the two support legs 10 and the corresponding guide rod 25 is provided with a guide groove 101 for accommodating the guide rod 25. The center of the guide groove 101 is in the same plane as the axis of the cam gear 23.

[0032] In the above scheme, the guide groove 101 constrains the sliding trajectory of the guide rod 25 at the connection point with the outrigger 10 to a specific plane, preventing the guide rod 25 from shifting due to vehicle vibration. The design of the guide groove 101's center being coplanar with the axis of the cam gear 23 ensures that the cam gear 23 at the end of the connecting rod 22 always maintains the correct meshing angle with the ratchet 13, preventing gear transmission failure due to deviation in the sliding path of the guide rod 25. Simultaneously, the guide groove 101's accommodating structure for the guide rod 25 enhances the rigidity of the connection between the outrigger 10 and the guide rod 25, reducing the radial clearance generated when the mounting plate 1 rotates, thereby suppressing the tendency of the mounting plate 1 to move.

[0033] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0034] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A support base for a traction seat, characterized in that, It includes two outriggers (10), two pivots (11), two pins (12), two ratchet wheels (13), two booms (14), and two sets of reset assemblies (20). The two support legs (10) are symmetrically arranged at intervals. The bottom of the two support legs (10) is fixedly connected to the vehicle body, and their tops are located inside the mounting plate (1) and are in rotational engagement with the mounting plate (1). One end of each of the two pivots (11) passes through the outside of the mounting plate (1) to the top of the corresponding support leg (10), and the other end slides in contact with the outer side of the mounting plate (1). One end of each of the two pins (12) passes through the radial direction of the corresponding shaft (11), and the other end is fixedly connected to the circumferential surface of the shaft (11), and a portion of the circumferential surface of the two pins (12) slides in contact with the inner surface of the mounting plate (1). The two ratchet wheels (13) are rotatably disposed in the middle of the corresponding support legs (10), and the rotation direction of the ratchet wheels (13) is perpendicular to the rotation direction of the mounting plate (1); The inner ends of the two booms (14) are hinged to the periphery of the corresponding ratchet (13), and their outer ends extend to the side of the support leg (10) near the mounting plate (1). The outer periphery of the two booms (14) is arc-shaped and abuts against the side of the mounting plate (1) near the support leg (10), forming a limiting fit. The two sets of reset components (20) have the same structure and are placed in the middle of the corresponding support legs (10). The working ends of the two sets of reset components (20) mesh with the peripheral gear of the corresponding ratchet (13), which can release the limit of the mounting plate (1) and the two booms (14).

2. The support base for the traction seat according to claim 1, characterized in that, The reset assembly (20) includes a connecting block (21), a connecting rod (22), a cam gear (23), and an elastic element (24). The connecting block (21) is slidably disposed at the bottom of the corresponding boom (14), and the two sides of the connecting block (21) in the width direction extend to the outer side of the opposite side of the boom (14); One end of the connecting rod (22) is fixedly connected to the side of the connecting block (21) away from the support leg (10) in the width direction, and the other end extends toward the side where the corresponding ratchet (13) is located, and is spaced above the ratchet (13); The cam gear (23) is rotatably disposed at one end of the connecting rod (22) away from the connecting block (21), and the circumferential surface of the cam gear (23) at the highest curvature meshes with the circumferential surface of the corresponding ratchet (13). One end of the elastic element (24) is fixedly connected to the end of the connecting block (21) near the connecting rod (22), and the other end is fixedly connected to the boom (14).

3. The support base for the traction seat according to claim 2, characterized in that, The boom (14) includes a horizontal section (141) and a curved section (142). One end of the horizontal section (141) is hinged to the periphery of the ratchet (13), and the other end is close to the mounting plate (1). The bottom of the boom (14) is recessed with a groove (143) facing downward for accommodating the connecting block (21). The longitudinal section of the groove (143) is generally a convex shape with one wide section and one narrow section.

4. The support base for the traction seat according to claim 3, characterized in that, The connecting block (21) has an overall I-shaped structure, and its top circumference is embedded in the groove (143) and slidably connected to the groove wall of the groove (143).

5. The support base for the traction seat according to claim 2, characterized in that, It also includes a guide rod (25), one end of which is fixedly connected to the end of the connecting rod (22) away from the corresponding connecting block (21), and the other end of which is slidably connected to the circumferential surface of the support leg (10).

6. The support base for the traction seat according to claim 5, characterized in that, The connection between the two legs (10) and the corresponding guide rod (25) is provided with a guide groove (101) for accommodating the guide rod (25), and the center of the guide groove (101) is in the same plane as the axis of the cam gear (23).

Images