Limiting mechanism of automobile lower back door

Abstract

The utility model discloses a limiting mechanism of an automobile lower back door, which comprises a sleeve which is provided with an opening end and is fixed with the lower back door, an inhaul cable which is provided with one end extending out of the opening end of the sleeve and is arranged in the sleeve in a telescopic mode, and a guide piece which is arranged at the opening end of the sleeve. The small end of the through cavity structure is communicated with the open end of the sleeve, and the inhaul cable penetrates through the through cavity structure and is in sliding contact with the inner wall of the through cavity structure and the end of the large end. The through cavity structure does not affect passing of the inhaul cable, the side wall of the outlet end of the sleeve is expanded outwards through the through cavity structure, the bending radius of the inhaul cable is increased, when the lower back door is completely opened, the inhaul cable is just matched with the long side position of the large end of the through cavity structure at the moment, the minimum bending radius of the inhaul cable at the bearing position is increased, and the service life of the inhaul cable is prolonged; and the operation durability of the whole limiting mechanism is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile back doors, in particular to a limiting mechanism of an automobile lower back door. Background Art

[0002] At present, there are many opening forms of car back doors, such as hatchback doors, split doors, side doors, and flip-up doors. Among them, split doors and flip-up doors divide the back door into two parts, which can reduce the length or height of the back door after opening, which is conducive to improving the convenience of taking and placing goods and the safety of using the back door.

[0003] The upper part of the flip-up and flip-down door is similar to the traditional hatchback structure, which divides the back door into two parts horizontally, the upper part folds up along the body, and the lower part folds down along the body to open the tailgate. The lower part can add additional load-bearing functions to the back door after opening, such as resting after flipping and serving as a storage table. Therefore, the lower part will be limited after opening, usually limiting the lower part to rotate 90° along the body.

[0004] In the prior art, in order to limit the position of the lower flip part, cables of a specific length can be set on both sides of the lower flip part, and the length of the cables is used to limit the position, so that the lower flip part can only rotate 90 degrees along the vehicle body. However, in this way, the cables cannot be stored, and the cables may slide into the gap between the lower flip part and the vehicle body during the folding process of the lower flip part, thereby preventing the folding of the lower flip part.

[0005] In order to solve the above problems, in the prior art, for example, in the patent with application number CN202320096936.3 and titled "An Electric Opening and Closing Device for Vehicle Floor Door", a limit cable assembly structure is described. The limit cable assembly structure includes a limit cable, a return spring sleeved outside the limit cable, and a limit sleeve sleeved outside the return spring. One end of the limit cable is located in the limit sleeve and fixed with a limit block. The limit block cooperates with the return spring. The other end of the limit cable is hinged to the vehicle body. A limit portion for limiting the sliding distance of the limit block is provided on the limit sleeve. The limit sleeve is fixed to the lower back door (downward flip portion). When in use, the lower back door is opened, the movement of the cable drives the limit block to move, and when the limit block moves to the limit position and stops sliding, the lower back door is in a horizontal state; when the lower back door is closed, the limit block moves into the limit sleeve under the action of the return spring, and the limit cable is stored in the limit sleeve to prevent the cable from slipping between the lower back door and the vehicle body and causing jamming.

[0006] However, in the above-mentioned limit cable assembly structure, after the lower back door is opened, the limit cable, as the main force-bearing component, is in direct friction contact with the end of the limit sleeve, and the end of the limit sleeve is a general round tube end structure. As a result, when the lower back door is opened to bear the load, the bending radius of the cable wire rope is small, which affects the service life of the limit cable and causes the durability of the limit cable structure to be poor. Utility Model Content

[0007] In view of the deficiencies in the prior art, the utility model provides a limiting mechanism for a lower back door of an automobile, which solves the problem of poor durability of the limiting mechanism in the prior art.

[0008] To achieve the above purpose, the utility model adopts the following technical solution: a limiting mechanism for a lower back door of an automobile is installed in conjunction with the lower back door, and the lower back door is used in conjunction with one limiting mechanism or with two symmetrically arranged limiting mechanisms.

[0009] The limiting mechanism includes a sleeve with an open end and fixed to the lower back door, a cable with one end extending out of the sleeve open end and telescopically arranged in the sleeve, and a guide member arranged at the sleeve open end.

[0010] The guide member includes a through-cavity structure, which is a tapered structure with an oblique opening at the large end. The small end of the through-cavity structure is connected to the opening end of the sleeve. The cable runs through the through-cavity structure and is in sliding contact with the inner wall of the through-cavity structure and the end of the large end.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The utility model improves the structure of the sleeve outlet end on the basis of the existing limiting cable structure, and the additional guide member has a through-cavity structure, which does not affect the passage of the cable. At the same time, the through-cavity structure is a contracted structure, which means that the through-cavity structure expands the side wall of the sleeve outlet end outward, thereby increasing the bending radius of the cable, and when the lower tailgate is fully opened (rotated 90° along the vehicle body), the cable just cooperates with the long side position of the large end of the through-cavity structure, thereby increasing the minimum bending radius of the cable at the load-bearing position, thereby increasing the service life of the cable and the durability of the operation of the entire limiting mechanism.

[0013] Furthermore, the small end of the through-cavity structure and the opening end of the sleeve are connected and fixed.

[0014] Furthermore, the guide piece is plugged into the open end of the sleeve and is detachably connected to the sleeve, and the small end of the through-cavity structure is fixed with an arc-shaped guide groove which is bent from the long side of the large end of the through-cavity structure toward its short side.

[0015] Furthermore, the guide piece is provided with a protrusion, and the sleeve is provided with a mounting hole plugged with the protrusion. The protrusion is clamped in the mounting hole and the guide piece is fixed to the sleeve by a retaining spring.

[0016] Furthermore, a mounting plate extending outward is provided at the open end of the sleeve, a mounting groove is provided on the mounting plate, an annular plate extending outward is provided on the guide member, the annular plate is embedded in the mounting groove, a first sealing ring is provided between the guide member and the open end of the sleeve, and a second sealing ring is provided between the annular plate and the mounting groove.

[0017] Furthermore, the groove bottom of the installation groove is inclined along the oblique direction of the through-cavity structure, and an adaptive drainage hole is provided on the annular plate at the inclined lower end of the groove bottom of the installation groove.

[0018] Furthermore, the sleeve is a split structure, including a bracket and a tube body;

[0019] The bracket is provided with a through slot for the cable to pass through, one end of the tube body is communicated with one end of the through slot and is detachably connected, the other end of the through slot is an opening end of the sleeve, and the guide piece and the bracket are installed in coordination.

[0020] Furthermore, a sealing gasket is provided between the tube body and the through groove, the inner ring of the sealing gasket is in sealing sliding contact with the cable, and the outer ring of the sealing gasket is fixed to the inner wall of the through groove or the inner wall of the tube body.

[0021] Furthermore, a hose is sleeved inside the tube body, a return spring is arranged inside the hose, the outer wall of the hose contacts the inner wall of the tube body, the inner wall of the hose contacts the return spring, and the return spring is sleeved on the cable and is compressed or returned inside the hose along with one end of the cable;

[0022] The end of the cable located in the tube body is fixed with an end head, the end head and one end of the return spring are in contact with each other, and the movement of the end head causes the return spring to be compressed or returned;

[0023] An anti-collision pad used in conjunction with the end head is arranged in the tube body, and the anti-collision pad and the return spring are respectively located on both sides of the end head along the length direction of the cable;

[0024] The part of the cable located in the pipe body is fixed with a limited joint, and the limited joint cooperates with the pipe body or the bracket to limit the moving distance of the cable.

[0025] Furthermore, the bracket is provided with a fixing portion fixed to the lower back door, and the outer sleeve of the tube body is provided with a sheath made of elastic material;

[0026] A ball and socket joint is fixed to one end of the cable extending out of the sleeve, and a threaded hole in a stepped hole structure fixed to the cable is provided on the ball and socket joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a structure in which the guide member and the sleeve are detachably connected to each other in the utility model;

[0028] Figure 2 for Figure 1 A schematic diagram of the structure from another perspective;

[0029] Figure 3 for Figure 2 Sectional view along line AA;

[0030] Figure 4 for Figure 3 Enlarged view of part A in the middle;

[0031] Figure 5 for Figure 3 Enlarged view of middle part B;

[0032] Figure 6 for Figure 1 Exploded diagram of the structure;

[0033] Figure 7 A schematic diagram of a bracket structure when the guide member and the bracket of the utility model are detachably connected;

[0034] Figure 8 This is a schematic diagram of a guide structure when the guide and the bracket of the utility model are detachably connected;

[0035] Fig. 9 for Figure 8 A schematic diagram of the structure from another perspective;

[0036] Fig.10 This is a structural diagram showing the first sealing ring, the second sealing ring and the retaining spring of the utility model;

[0037] Fig.11 It is a structural schematic diagram of the ball and socket joint of the utility model;

[0038] Fig.12 This is a structural cross-sectional view of the ball and socket joint of the utility model;

[0039] Fig.13 A schematic diagram of a structure in which the guide member and the sleeve are fixedly connected in the utility model;

[0040] Fig.14 for Fig.13 A cross-sectional view of

[0041] Fig.15 A schematic diagram of a bracket structure when the guide member and the bracket are fixedly connected to each other in the utility model;

[0042] Fig.16 for Fig.15 A schematic diagram of the structure from another perspective;

[0043] Fig.17 for Fig.16 Sectional view along line BB.

[0044] In the figure: sleeve 1, bracket 11, fixing part 111, through groove 112, mounting hole 113, mounting groove 114, mounting plate 115, connecting arm 116, reinforcing rib 117, tube body 12, end cover head 121, anti-collision pad 1211, sheath 122, hose 123, guide member 3, through cavity structure 31, arc guide groove 32, reinforcing positioning rib 33, annular plate 34, drainage hole 35, protrusion 36, cable 4, end 41, limit member 42, ball joint 5, threaded hole 51, return spring 6, sealing gasket 7, first sealing ring 8, second sealing ring 9, retaining spring 10. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0046] like Figure 1 , 2 As shown in 13, a limiting mechanism for a lower back door of a car is used to limit the opening angle of the lower back door. To this end, the entire limiting mechanism is installed in conjunction with the lower back door. The number of limiting mechanisms installed can be selected according to the installation position of the driving mechanism of the lower back door. If the structure of the driving mechanism is similar to the structure in the prior art (application number CN202320096936.3), the driving mechanism can cooperate with the limiting mechanism to limit the two sides of the lower back door, and the lower back door only needs to be provided with one limiting mechanism for cooperation and limitation. If the position of the driving mechanism is set in the middle position of the lower back door to drive the lower back door to rotate, the lower back door needs to be provided with two limiting mechanisms, and the two limiting mechanisms need to be respectively arranged on both sides of the lower back door and symmetrically arranged to ensure that the load-bearing capacity on both sides of the lower back door is equal and the force is more uniform, which can improve the load-bearing performance of the lower back door. Of course, if the driving mechanism used in conjunction with the lower back door does not have a limiting function, the lower back door also needs to be used in conjunction with two symmetrically arranged limiting mechanisms. In this embodiment, the lower back door is used in conjunction with two symmetrically arranged limiting mechanisms.

[0047] In one embodiment of the utility model, the limiting mechanism includes a sleeve 1 having an open end and fixed to the lower back door, and a cable 4 having one end extending out of the open end of the sleeve 1 and being telescopically arranged in the sleeve 1. The sleeve 1 can be a tubular structure with one end open, or a tubular structure with two ends open, and the structure of the cable 4 in the sleeve 1 can be arranged with reference to the prior art, ensuring that the cable 4 can slide back and forth (or move) within a specific distance range in the sleeve 1 and can also be accommodated in the sleeve 1. During installation, one end of the cable 4 extending out of the sleeve 1 is hinged to the vehicle body, and the sleeve 1 is fixed to the lower back door. When the lower back door is opened to bear weight, the lower back door rotates to move the sleeve 1, and the sleeve 1 moves, and the other end of the cable 4 is fixed to the vehicle body, forcing the cable 4 to extend along the sleeve 1, and the distance of the cable 4 extending is adapted to the angle of opening of the lower back door. At this time, the cable 4 and the end of the sleeve 1 cooperate and are in a bent state to bear weight.

[0048] Since the opening structure of the sleeve 1 in the prior art results in a smaller bending radius of the cable 4 when bearing a load, in order to increase the bending radius of the cable 4 during the load-bearing process and improve the durability of the limiting mechanism. Figure 1 , 13 As shown, in this embodiment, a guide member 3 is provided at the open end of the sleeve 1, and the guide member 3 includes a through-cavity structure 31, and the through-cavity structure 31 is a shrinking structure with an oblique opening at the large end. The small end of the through-cavity structure 31 is connected to the open end of the sleeve 1, and the cable 4 passes through the through-cavity structure 31 and is in sliding contact with the large end of the through-cavity structure 31. The shrinking structure can adopt a truncated cone structure or a trumpet-shaped structure, and the edge position of the large end of the through-cavity structure 31 is smoothly rounded. The purpose of the through-cavity structure 31 is to enlarge the diameter of the open end of the sleeve 1, and to provide an inner wall structure that rubs against the cable 4, so that the movement of the cable 4 is smoother, and the service life of the cable 4 and the durability of the limit mechanism are improved. At the same time, in order to further increase the bending radius of the cable 4 when bearing load, the large end of the through-cavity structure 31 of the utility model is an oblique structure, so that the overall structure of the through-cavity structure 31 is roughly a streamlined oblique trumpet shape. When the cable 4 is load-bearing (the lower back door is fully opened), the cable 4 is exactly matched with the long side position of the large end of the through-cavity structure 31, increasing the minimum bending radius of the cable 4 at the load-bearing position, improving the service life of the cable 4, and improving the durability of the operation of the entire limiting mechanism.

[0049] In order to make the cable 4 compatible with the through-cavity structure 31, the cable 4 adopts a structure of an internal steel wire rope and an external coating, the steel wire is made of high-carbon steel + zinc-aluminum coating, and the surface of the steel wire rope is nylon-coated, so that the steel wire rope has better flexibility and better corrosion resistance under the condition of sufficient strength, and the plastic coating can also have a smaller friction with the guide 3. Similarly, in order to reduce the mutual friction between the cable 4 and the guide 3, the guide 3 can be an injection molded part to further reduce the mutual friction between the cable 4 and the through-cavity structure 31.

[0050] In another embodiment of the present invention, Figure 13-17 As shown, the small end of the through-cavity structure 31 is connected and fixed to the open end of the sleeve 1, and the guide member 3 and the sleeve 1 are an integrated structure. The guide member 3 and the sleeve 1 can be fixedly connected by welding, riveting, die-casting, etc. This structure is easy to form and can save production costs. The guide member 3 can be directly set at the open end position of the sleeve 1 in the prior art. Similarly, the overall structure of the guide member 3 and the sleeve 1 can also be changed according to the structure of the sleeve 1. It is only necessary to ensure that the guide member 3 is set at the open end position of the sleeve 1 to achieve the effect of increasing the load-bearing bending radius of the cable 4.

[0051] In another embodiment of the present invention, a guide member 3 structure is also provided, such as Figure 1 , 2 As shown in , 3, 4, 6, 7, 8, and 9, the guide member 3 is plugged into the open end of the sleeve 1 and is detachably connected to the sleeve 1, and the small end of the through-cavity structure 31 is fixed with an arc-shaped guide groove 32 arranged in contact, and the arc-shaped guide groove 32 is bent from the long side of the large end of the through-cavity structure 31 toward the short side thereof. The guide member 3 and the sleeve 1 are plugged into and detachably connected, and the arc direction of the arc-shaped guide groove 32 is limited to ensure that the cable 4 is in contact with the arc-shaped guide groove 32 and the long side of the large end of the through-cavity structure 31 during the load-bearing process, further increasing the bending radius of the cable 4 during the load-bearing process and improving the durability of the cable 4. The structure of the sleeve 1 can be the same as that in the prior art, which is a tubular structure with one end open, or it can be other structures, as long as it is ensured that the sleeve 1 can be detachably connected to the guide member and can provide a plug-in space for the arc-shaped guide groove 32.

[0052] Since the arc-shaped guide groove 32 is mainly used to further increase the bending radius of the cable 4 during the stress process of the cable 4, the guide member 3 and the sleeve 1 need to be plugged and positioned when they are installed to ensure the use position of the cable 4. Figure 7 , 8 As shown in FIG. 9 , in this embodiment, a projection 36 is provided on the guide member 3, and a mounting hole 113 plugged with the projection 36 is provided on the sleeve 1. The projection 36 is clamped in the mounting hole 113 and fixed to the guide member 3 and the sleeve 1 by the clamping spring 10. By plugging and positioning the projection 36 and the mounting hole 113, the through-cavity structure 31 of the guide member 3 and the cable 4 can be positioned and fixed. Of course, the positioning of the guide member 3 and the sleeve 1 can also be a buckle structure, a special-shaped rod plug-in positioning, etc.

[0053] Since the guide member 3 and the sleeve 1 are plugged together, there is a plug-in gap between the two, resulting in a poor sealing effect. In order to improve the sealing effect between the two, the utility model is provided with an outwardly extending mounting plate 115 at the open end of the sleeve 1, and a mounting groove 114 is provided on the mounting plate 115. An outwardly extending annular plate 34 is provided on the guide member 3, and the annular plate 34 is embedded in the mounting groove 114. A first sealing ring 8 is provided between the guide member 3 and the open end of the sleeve 1, and a second sealing ring 9 is provided between the annular plate 34 and the mounting groove 114. Figure 3 , 6 As shown in Figures 7, 8, 9 and 10, since the guide member 3 in this embodiment is provided with an arc-shaped guide groove 32, a larger installation space needs to be set at the open end of the tube body 12 to facilitate the installation of the arc-shaped guide groove 32, while ensuring that the distance between the inner wall of the sleeve 1 opposite to the arc-shaped guide groove 32 and the diameter of the cable 4 are adapted. For this reason, the sleeve 1 is provided with an installation cavity near its open end, and the open end of the installation cavity is the open end of the sleeve 1. The guide member 3 is plugged into the installation cavity, and the arc-shaped guide groove 32 is located in the installation cavity. At this time, a first sealing ring 8 (rectangular annular structure) is provided between the port at the open end of the installation cavity and the guide member 3 to seal the two. At this time, the annular plate 34 of the guide member 3 is embedded in the installation groove 114, and then the second sealing ring 9 (circular annular structure) is sleeved on the annular plate 34 and contacts the side wall of the installation groove 114. The first sealing ring 8 and the second sealing ring 9 are used to achieve double sealing at the insertion position of the guide member 3 and the sleeve 1 to prevent water from entering the sleeve 1 and affecting the operation of the cable 4.

[0054] Even if a double-layer sealing structure is adopted between the guide member 3 and the sleeve 1, it is inevitable that there is still a gap between the two to cause water accumulation. In order to drain the water between the two, the bottom of the installation groove 114 is inclined along the oblique direction of the through cavity structure 31, and an adaptive drainage hole 35 is provided on the annular plate 34 at the inclined lower end of the bottom of the installation groove 114. Figure 7 , 8 As shown in Figures 9, the position of the drainage hole 35 is matched with the inclined lower end of the bottom of the mounting groove 114, ensuring that the water in the gap between the guide member 3 and the sleeve 1 can be discharged along the drainage hole 35. At the same time, the water entering the sleeve 1 can also be guided along the drainage hole 35 without affecting the use of the cable 4 in the sleeve 1.

[0055] In another embodiment of the present invention, in order to facilitate the assembly of various components of the limit assembly, the sleeve 1 can adopt a split structure to facilitate the installation of the cable 4 in the sleeve 1 and the assembly of the guide member 3. To this end, in this embodiment, Figure 1 , 2As shown in Figures 3, 6 and 13, the sleeve 1 is a split structure, including a bracket 11 and a tube body 12; a through slot 112 is provided on the bracket 11 for the cable 4 to pass through, one end of the tube body 12 is connected to one end of the through slot 112 and can be detachably connected, the other end of the through slot 112 is the open end of the sleeve 1, and the guide member 3 and the bracket 11 are installed in cooperation. The bracket 11 can be set as a tubular structure, or other special-shaped structures can be used. The tube body 12 and the bracket 11 can be fixed by welding, threaded connection, etc., and the component used to limit the moving distance of the cable 4 is connected with the cable 4 in the tube body 12. The main purpose of the bracket 11 is to facilitate the fixation of the entire sleeve 1 and the lower back door. For this purpose, a fixing portion 111 protruding outward is provided on the bracket 11, and the fixing portion 111 is a threaded hole 51 or a rivet hole, so that the bracket 11 and the lower back door can be fixed by bolts or rivets. The number of the fixing parts 111 can be set according to the structure of the guide member 3 and the installation structure of the bracket 11 and the guide member 3. In the present invention, since the guide member 3 and the bracket 11 are connected in two ways, the present invention presents two bracket 11 structures.

[0056] like Figure 13-17 As shown, the bracket 11 and the guide member 3 of this structure are an integrated structure, and the integrated structure of the bracket 11 and the guide member 3 is formed by zinc-aluminum alloy die-casting. The tubular structure (through groove 112) of the bracket 11 is relatively long, and its purpose is to provide a longer transition space for the cable 4 to reduce wear. However, the through groove 112 of the bracket 11 is relatively long, which has the problem of inconvenience in molding, and at the same time, there is a certain risk in the overall strength of the bracket 11. For this reason, the bracket 11 of this structure has two fixing parts 111, which are distributed on the left and right sides of the through groove 112 (tube body 12 or the entire sleeve 1). At the same time, during installation or delivery, a bolt can be pre-hung on each fixing part 111 to facilitate assembly by the main engine factory and improve assembly efficiency. This structure of the bracket 11 and the guide member 3 can solve the problem of difficult molding of the bracket 11, and can also improve the OEM assembly efficiency and achieve the lightweight effect of the entire limiting mechanism.

[0057] like Figure 1-10As shown, the utility model also provides a bracket 11 structure, which is adapted to the detachably connected guide member 3. Specifically, the installation cavity is provided on the bracket 11, and the through slot 112 of the bracket 11 is also a structure with one end larger than the other end, the small end is connected to the tube body 12, and the large end is used to plug the guide member 3. The installation cavity is provided on the bracket 11, which is equivalent to a part of the through slot 112. In order to allow the side of the arc-shaped guide slot 32 away from the through cavity to be connected to the small end of the through slot 112, a reinforcing positioning rib 33 is provided on the arc-shaped outer side of the arc-shaped guide slot 32, and the reinforcing positioning rib 33 extends along the length direction of the arc-shaped guide slot, and any position of the reinforcing positioning rib 33 contacts the inner wall of the through slot 112 to highly position the arc-shaped guide slot 32, so as to ensure that the arc-shaped guide and the small end of the through slot 112 are adapted to each other, so as to facilitate the movement of the cable 4. The mounting plate 115 is arranged on the bracket 11, and the mounting groove 114 is provided on the mounting plate 115. The first sealing ring 8 and the second sealing ring 9 are used to realize a double sealing connection between the guide member 3 and the mounting groove 114. At the same time, the mounting hole 113 is also provided on the bracket 11 to ensure that the guide member 3 and the mounting groove 114 are positioned and connected. Three fixing parts 111 are arranged on the bracket 11. The distribution of the three fixing parts 111 is determined according to the force distribution of the bracket 11, and at least two of the fixing parts 111 are respectively located on both sides of the sleeve 1. The sleeve 1 with a split structure can facilitate the installation of the guide member 3 and the bracket 11, and can also facilitate the separate production of the bracket 11 and the tube body 12, making the production of the sleeve 1 more convenient.

[0058] In another embodiment of the utility model, in order to realize the telescopic setting of the cable 4 in the sleeve 1, a reset component is set in the sleeve 1, and the reset component is usually a spring. During installation, one end of the spring can be fixed to the inner wall of the sleeve 1, and the other end can be fixed to the cable 4. At the same time, the moving distance of the moving end of the spring is limited in the sleeve 1, so that the cable 4 can be ensured to be telescopically set in the sleeve 1. Of course, the spring can also be sleeved on the cable 4, and a clamp is fixed on the cable 4 and set against the spring, and a limiter 42 is set in the sleeve 1 to limit the moving distance of the cable 4. Then, the clamp can compress the spring as the cable 4 moves, and at the same time, the cable 4 can be retracted into the sleeve 1 under the reset action of the spring.

[0059] In this embodiment, a spring is also used as the reset component of the cable 4, and in order to avoid the spring from generating a large noise when being compressed and reset in the tube body 12, and at the same time facilitate the cable 4 to play the purpose of resetting and buffering the spring during the spring reset process. In this embodiment, the components in the tube body 12 are designed to achieve the above purpose. Specifically, a hose 123 is sleeved inside the tube body 12, and a reset spring 6 is arranged inside the hose 123. The outer wall of the hose 123 contacts the inner wall of the tube body 12, and the inner wall of the hose 123 contacts the reset spring 6. The reset spring 6 is sleeved on the cable 4 and is compressed or reset in the hose 123 along with one end of the cable 4. An end 41 is fixed to the end of the cable 4 located in the tube body 12, and the end 41 and one end of the reset spring 6 are in contact with each other, and the movement of the end 41 compresses or resets the reset spring 6. An anti-collision pad 1211 used in conjunction with the end 41 is arranged in the tube body 12, and the anti-collision pad 1211 and the reset spring 6 are respectively located on both sides of the end 41 along the length direction of the cable 4. A limiting joint is fixed to the part of the cable 4 located in the tube body 12, and the limiting joint cooperates with the tube body 12 or the bracket 11 to limit the moving distance of the cable 4. Figure 3 , 4 As shown in , 5, 6, and 14, an opening is set at one end of the tube body 12 away from the bracket 11, and the tube is sealed by an end cap 121 that is pressed or threaded, and the end cap 121 is set to facilitate the installation of the anti-collision pad 1211. The anti-collision pad 1211 is clamped and fixed on the end cap 121, and then the end cap 121 is pressed and fixed on the open end of the tube body 12 away from the bracket 11. When the lower back door is opened, the cable 4 moves in the tube body 12 with the rotation of the lower back door, and one end of the cable 4 drives the end head 41 to move, and the end head 41 moves to compress the reset spring 6, and the limit joint moves with the cable 4. When the limit joint moves to the matching position of the tube body 12 or the bracket 11 (the inner diameter of the through slot 112 of the bracket 11 is smaller than the diameter of the tube body 12, and the limit joint is larger than the inner diameter of the through slot 112), it is limited. At this time, the lower back door is rotated to a preset angle for load-bearing use. When the lower back door is to be folded, the reset spring 6 resets and drives the end 41 to move, and then moves the cable 4 along the tube body 12 for storage. Due to the cooperation between the anti-collision pad 1211 and the end 41, even if the elastic force of the reset spring 6 is large and the end 41 moves quickly, the collision between the end 41 and the inside of the tube body 12 can be avoided, and the abnormal noise can be reduced. At the same time, the hose 123 can eliminate the gap between the reset spring 6 and the tube body 12, and can effectively prevent the friction noise between the reset spring 6 and the tube body 12 during the actuation process, ensuring that the entire limit mechanism has a low noise function. The hose 123 can be made of TPEE resin, which has a certain elasticity and a low friction coefficient.

[0060] In another embodiment of the utility model, since the component for realizing the contraction of the cable 4 in the tube body 12 is a spring, in order to prevent external water from entering the tube body 12 and affecting the use of the spring, a sealing gasket 7 is provided between the tube body 12 and the through groove 112 in this embodiment. The inner circle of the sealing gasket 7 is in sealing and sliding contact with the cable 4, and the outer circle of the sealing gasket 7 is fixed to the inner wall of the through groove 112 or the inner wall of the tube body 12. The connection between the tube body 12 and the bracket 11 is connected in the form of internal and external threads. Correspondingly, the bracket 11 can be sleeved on the outside of the tube body 12 and threadedly connected to the tube body 12, or the bracket 11 can be embedded in the tube body 12 and threadedly connected to the tube body 12. Correspondingly, the component with external threads (the component located on the inside) is in contact with the cable 4. For this reason, the fixing position of the sealing gasket 7 can be determined according to the different sleeve methods between the bracket 11 and the tube body 12. In this embodiment, the bracket 11 is embedded in the tube body 12 and threadedly connected to the tube body 12. For this reason, the sealing gasket 7 and the bracket 11 are fixed, such as Figure 3 , 4 As shown in 14, the sealing gasket 7 is annular, the inner ring of the sealing gasket 7 and the cable 4 are in sealing sliding contact (interference fit), and the sealing gasket 7 is clamped in the mounting groove of the bracket 11. When the cable 4 moves, the sealing gasket 7 can prevent the water adhering to the cable 4 from entering the inside of the tube body 12, thereby avoiding the problem of rusting of the reset spring 6. The entire limiting mechanism is waterproof and can meet the daily use scenarios of the vehicle.

[0061] In another embodiment of the utility model, since the lower back door is usually an arc-shaped plate structure, after the bracket 11 and the lower back door are fixed, there is a problem of installation gap between the tube body 12 and the lower back door. The existence of this gap makes the entire limit mechanism prone to abnormal noise during use. Therefore, in order to solve this problem, in this embodiment, as Figure 1 , 2 , 3, 6, 13, 14. A sheath 122 made of elastic material is disposed outside the tube body 12. The sheath 122 is made of elastic material such as rubber, which can eliminate the gap between the tube body 12 and the lower back door, and can also adapt to the lower back door structure of different models, reducing or avoiding abnormal noise during use.

[0062] After the sleeve 1 and the lower tailgate are assembled, the cable 4 needs to be extended out of the sleeve 1 and hinged to the vehicle body. In the prior art, a ball bolt and a ball joint 5 are used to achieve a rotational connection between the cable 4 and the vehicle body. However, in the prior art, when the cable 4 and the ball joint 5 are connected, the cable 4 is passed through the connection hole of the ball joint 5 and riveted to achieve the fixation of the cable 4 and the ball joint 5. However, this method has a poor anti-slip effect between the cable 4 and the ball joint 5, and the bite force is insufficient. For this reason, in this implementation, if Fig.11 , 12As shown, the end of the cable 4 extending out of the sleeve 1 is fixed with a ball joint 5, and the ball joint 5 is provided with a threaded hole 51 with a stepped hole structure fixed to the cable 4. The through hole on the ball joint 5 for installing the wire rope (cable 4) is changed to a threaded hole 51 with a stepped hole structure. The threaded hole 51 can improve the bite force after riveting, and the step hole can be riveted into the plastic coating layer to prevent the diameter of the wire rope from being exposed to the air. The improved ball joint 5 increases the pull-off force after riveting with the wire rope and the anti-corrosion ability of the assembly, so that the pull-off force between the two is more than 5000N, and this connection method can also make the two have better anti-corrosion performance.

[0063] In another embodiment of the present invention, Figure 1 , 7 As shown in FIGS. 13 and 15 , one of the fixing parts 111 on the bracket 11 is arranged on a connecting arm 116 extending outward from the bracket 11. The arrangement of the connecting arm 116 can disperse the spacing between the multiple fixing parts 111 (at least two fixing parts 111) on the bracket 11 along the length direction of the sleeve 1, thereby improving the connection strength between the bracket 11 and the lower back door. At the same time, the connecting arm 116 is provided with multiple reinforcing ribs 117. The reinforcing ribs 117 can be a structure formed by multiple grooves provided on the connecting arm 116, or a structure protruding from the connecting arm 116. Since the connecting arm 116 has a bent structure, the arrangement of the reinforcing ribs 117 can improve the overall strength of the bent connecting arm 116, thereby improving the stability of the assembly between the bracket 11 and the lower back door.

[0064] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A limiting mechanism for a lower back door of an automobile, installed in conjunction with the lower back door, characterized in that: The lower back door is used in conjunction with a limit mechanism or with two symmetrically arranged limit mechanisms. The limiting mechanism comprises a sleeve (1) having an open end and fixed to the lower back door, a cable (4) having one end extending out of the open end of the sleeve (1) and being telescopically arranged in the sleeve (1), and a guide member (3) arranged at the open end of the sleeve (1). The guide member (3) comprises a through-cavity structure (31), wherein the through-cavity structure (31) is a narrowing structure with an oblique opening at the large end, the small end of the through-cavity structure (31) is in communication with the open end of the sleeve (1), and the cable (4) passes through the through-cavity structure (31) and is in sliding contact with the inner wall of the through-cavity structure (31) and the end of the large end.

2. The limiting mechanism of the lower back door of an automobile according to claim 1, characterized in that: The small end of the through-cavity structure (31) and the open end of the sleeve (1) are connected and fixed.

3. The limiting mechanism of the lower back door of an automobile according to claim 1, characterized in that: The guide member (3) is plugged into the open end of the sleeve (1) and is detachably connected to the sleeve (1), and a connected arc-shaped guide groove (32) is fixed to the small end of the through-cavity structure (31), and the arc-shaped guide groove (32) is bent from the long side of the large end of the through-cavity structure (31) toward the short side thereof.

4. The limiting mechanism of the lower back door of an automobile according to claim 3, characterized in that: The guide member (3) is provided with a protrusion (36), and the sleeve (1) is provided with a mounting hole (113) plugged into the protrusion (36). The protrusion (36) is clamped in the mounting hole (113) and fixed to the guide member (3) and the sleeve (1) via a retaining spring (10).

5. The limiting mechanism of the lower back door of an automobile according to claim 4, characterized in that: The open end of the sleeve (1) is provided with a mounting plate (115) extending outwards, the mounting plate (115) is provided with a mounting groove (114), the guide member (3) is provided with an annular plate (34) extending outwards, the annular plate (34) is embedded in the mounting groove (114), a first sealing ring (8) is provided between the guide member (3) and the open end of the sleeve (1), and a second sealing ring (9) is provided between the annular plate (34) and the mounting groove (114).

6. The limiting mechanism of the lower back door of an automobile according to claim 5, characterized in that: The groove bottom of the installation groove (114) is arranged obliquely along the oblique direction of the through-cavity structure (31), and a matching drainage hole (35) is provided on the annular plate (34) at the oblique lower end of the groove bottom of the installation groove (114).

7. A limiting mechanism for a lower back door of an automobile according to any one of claims 1 to 6, characterized in that: The sleeve (1) is a split structure, comprising a support (11) and a tube body (12); The bracket (11) is provided with a through slot (112) for the cable (4) to pass through; one end of the tube body (12) and one end of the through slot (112) are connected and detachably connected; the other end of the through slot (112) is the opening end of the sleeve (1); and the guide member (3) and the bracket (11) are mounted in coordination.

8. The limiting mechanism of the lower back door of an automobile according to claim 7, characterized in that: A sealing gasket (7) is provided between the tube body (12) and the through groove (112); the inner ring of the sealing gasket (7) is in sealing sliding contact with the cable (4); and the outer ring of the sealing gasket (7) is fixed to the inner wall of the through groove (112) or the inner wall of the tube body (12).

9. The limiting mechanism of the lower back door of an automobile according to claim 7, characterized in that: A hose (123) is sleeved inside the tube body (12), a return spring (6) is arranged inside the hose (123), the outer wall of the hose (123) contacts the inner wall of the tube body (12), the inner wall of the hose (123) contacts the return spring (6), and the return spring (6) is sleeved on the cable (4) and is compressed or returned inside the hose (123) along with one end of the cable (4); An end of the cable (4) located in the tube body (12) is fixed with an end head (41), the end head (41) and one end of the return spring (6) are in contact with each other, and the end head (41) moves to compress or return the return spring (6); An anti-collision pad (1211) used in conjunction with the end head (41) is provided in the tube body (12); the anti-collision pad (1211) and the return spring (6) are respectively located on both sides of the end head (41) along the length direction of the cable (4); The portion of the cable (4) located inside the tube (12) is fixed with a limit joint, and the limit joint cooperates with the tube (12) or the bracket (11) to limit the moving distance of the cable (4).

10. A limiting mechanism for a lower back door of an automobile according to claim 8 or 9, characterized in that: The bracket (11) is provided with a fixing portion (111) fixed to the lower back door, and the outer cover of the tube body (12) is provided with a sheath (122) made of elastic material; A ball joint (5) is fixed to one end of the cable (4) extending out of the sleeve (1), and a threaded hole (51) in a stepped hole structure fixed to the cable (4) is provided on the ball joint (5).

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