A ball clamping and fixing structure suitable for trailer balls

Abstract

A ball-clamping and fixing structure suitable for a trailer ball, wherein a trailer ball is provided with a buckle ear at a predetermined position; a ball-clamping and fixing structure comprises a covering piece, a bell-shaped cover, a knob and a bolt body, wherein the bell-shaped cover is provided with a connecting portion connected to a vehicle-carrying frame, the knob is used to pull the covering piece to clamp the trailer ball, the bell-shaped cover is used to press the covering piece to cover and tighten the trailer ball, and the bolt body penetrates the covering piece and the bell-shaped cover. The cover is then combined with the knob, and the knob is tightened to pull the cover to clamp the trailer ball against the inner wall of the bell-shaped cover, so that the carrier frame is fastened to the trailer ball; the bell-shaped cover is composed of an upper sleeve and a lower sleeve, the bottom end of the upper sleeve is provided with a bottom plate, the bottom end of the lower sleeve is provided with a symmetrically arranged arc-shaped notch corresponding to the buckle ear, and the top end of the lower sleeve is provided with a top plate, and the bottom plate and the top plate are firmly combined by multiple screws and multiple nuts.

Description

Technical Field

[0001] The invention relates to a ball clamping and fixing structure suitable for a trailer ball, in particular to a safety device for fastening a vehicle carrier frame to a trailer ball at the rear end of a vehicle. Background Art

[0002] Nowadays, modern people attach great importance to outdoor leisure activities, especially the government has built bicycle paths in major tourist attractions, so cycling has become a favorite sport for Chinese people. It is common to see consumers preparing and carrying bicycles on the road.

[0003] A common trailer carrier adopts a trailer ball fixed at the rear end of the car, and the trailer carrier clamps the aforementioned trailer ball through a trailer carrier fixing device; the applicant has spared no effort in the field of trailer ball clamping and fixing devices, developed and designed a variety of trailer ball clamping and fixing structures, and has successively obtained patents in many countries at home and abroad.

[0004] In order to increase safety, some businesses have provided connecting buckles on the trailer ball, and the bottom end of the vehicle frame fixing device is provided with a hook corresponding to the buckle ear. By buckling the hook on the buckle ear, the vehicle frame fixing device can be firmly attached to the trailer ball.

[0005] The disadvantage of the above structure is that the bicycle frame fixing device adopts a hooking method, which may cause the bicycle frame to loosen when the road surface is uneven. Summary of the invention

[0006] The main purpose of the present invention is to provide a ball clamping fixing structure suitable for a trailer ball, that is, to improve the shortcomings of the existing vehicle frame fixing device, divide the bell cover into an upper and a lower part, and lock the two together through screws and nuts, so that the vehicle frame fixing structure can be firmly attached to the trailer ball.

[0007] Therefore, the structure of the present invention is used to clamp a trailer ball, the trailer ball having a sphere and an L-shaped rod, the L-shaped rod is connected to the rear end of a car, and the trailer ball is provided with a buckle ear at a predetermined position;

[0008] A ball clamping and fixing structure includes a covering member, a bell-shaped cover, a knob and a bolt body. The bell-shaped cover is provided with a connecting portion at a predetermined position to connect with the vehicle carrying frame. The knob is used to pull the covering member to clamp the trailer ball. The bell-shaped cover is used to press the covering member to cover and tighten the trailer ball. After the bolt body penetrates the covering member and the bell-shaped cover, it is combined with the knob. By tightening the knob, the covering member is pulled up to clamp the trailer ball and tighten it to the inner wall of the bell-shaped cover, so that the vehicle carrying frame is tight to the trailer ball.

[0009] The bell-shaped cover is composed of an upper sleeve and a lower sleeve. The bottom end of the upper sleeve is provided with a bottom plate, the bottom end of the lower sleeve is provided with a symmetrically arranged arc-shaped notch corresponding to the buckle ear, and the top end of the lower sleeve is provided with a top plate. The aforementioned bottom plate and top plate are provided with corresponding through holes. After a plurality of screws are inserted into the through holes, a plurality of nuts are screwed on the screws to ensure that the bell-shaped cover is firmly combined.

[0010] Furthermore, the connecting portion and the bottom plate of the upper sleeve are welded to the upper sleeve, and the top plate is also connected to the lower sleeve by welding.

[0011] Furthermore, the bottom plate is also provided with a folded edge covering the top plate.

[0012] Furthermore, the outer diameter of the lower sleeve is greater than the diameter of the sphere of the trailer ball, and the outer edge of the arc-shaped notch has an inwardly concave arc surface.

[0013] A ball clamping and fixing structure suitable for a trailer ball is used to clamp a trailer ball, the trailer ball comprises a ball and an L-shaped rod, the L-shaped rod is connected to the rear end of a car, and the trailer ball is provided with a buckle ear at a predetermined position;

[0014] A ball clamping fixing structure includes a covering member, a bell-shaped housing, a knob and a bolt body. The covering member is installed inside the bell-shaped housing. The covering member is divided into three equal pieces, and a U-shaped groove for connecting the bolt body is provided on the top of the covering member. A ball groove for covering the trailer ball is provided inside the covering member. The top of the covering member has a column, and the column provides an inverted plug connection for the bolt body. A flange head of the bolt body is arranged on a bolt groove inside the column, and a tie ring is provided on the outside of the column to fix the top of the covering member;

[0015] The knob is used to pull up the covering member, and the bell-shaped housing is used to press the covering member to cover and tighten the trailer ball. After the bolt body penetrates the covering member and the bell-shaped housing, it is combined with the knob. By tightening the knob, the covering member is pressed against the bell-shaped housing so that the carrier frame is fastened to the trailer ball.

[0016] The bell-shaped cover includes an upper sleeve and a lower sleeve. The upper sleeve is in the shape of a conical sleeve. A connecting portion for connecting to a bicycle frame is provided at a predetermined position of the upper sleeve. A bottom plate is provided at the bottom end of the upper sleeve. The lower sleeve is in the shape of a circular ring and a symmetrically arranged arc-shaped notch corresponding to the buckle ear is provided at the bottom end. A top plate is provided at the top end of the lower sleeve. The bottom plate and the top plate are provided with corresponding through holes. After a plurality of screws are inserted into the through holes, a plurality of nuts are screwed to the screws to ensure a stable combination of the bell-shaped cover.

[0017] Furthermore, the connecting portion and the bottom plate of the upper sleeve are welded to the upper sleeve, and the top plate is also connected to the lower sleeve by welding.

[0018] Furthermore, a gasket is provided between the column and the knob to adjust the distance between the covering member and the knob.

[0019] Furthermore, the covering piece can be divided into four equal pieces.

[0020] Furthermore, the bottom plate is also provided with a folded edge covering the top plate.

[0021] Furthermore, the outer diameter of the lower sleeve is greater than the diameter of the sphere of the trailer ball, and the outer edge of the arc-shaped notch has an inwardly concave arc surface.

[0022] A ball clamping and fixing structure suitable for a trailer ball is used to clamp a trailer ball. The trailer ball is composed of a ball and an L-shaped rod. The L-shaped rod is connected to the rear end of a car. The trailer ball is provided with a buckle ear at a predetermined position.

[0023] A ball clamping and fixing structure includes a covering member, a bell-shaped housing, a bolt body, a connecting rod device and a pressure rod device. The covering member is installed inside the bell-shaped housing. The covering member is divided into three equal pieces, and a U-shaped groove for connecting the bolt body is provided on the top of the covering member. A ball groove for covering the trailer ball is provided inside the covering member. The top of the covering member has a column, and the column provides an inverted plug connection for the bolt body. A flange head of the bolt body is arranged on a bolt groove inside the column, and a tie ring is provided on the outside of the column to fix the top of the covering member;

[0024] The connecting rod device and the pressing rod device are used to pull up the covering member, and the bell-shaped cover is used to press the covering member to cover and tighten the trailer ball. After the bolt body penetrates the covering member and the bell-shaped cover, it is combined with the connecting rod device. The pressing rod device drives the connecting rod device to tighten the covering member to the bell-shaped cover so that the vehicle carrier is fastened to the trailer ball.

[0025] The bell-shaped cover is composed of an upper sleeve and a lower sleeve. The upper sleeve is in the shape of a conical sleeve. A connecting portion for connecting to the vehicle frame is provided at a predetermined position of the upper sleeve. A bottom plate is provided at the bottom end of the upper sleeve. The lower sleeve is in the shape of a circular ring. A symmetrically arranged arc-shaped notch corresponding to the buckle ear is provided at the bottom end. A top plate is provided at the top end of the lower sleeve. Corresponding through holes are provided on the aforementioned bottom plate and top plate. After a plurality of screws are inserted into the through holes, a plurality of nuts are screwed to the screws to ensure that the bell-shaped cover is firmly combined.

[0026] Furthermore, the connecting portion and the bottom plate of the upper sleeve are welded to the upper sleeve, and the top plate is also connected to the lower sleeve by welding.

[0027] Furthermore, the covering piece can be divided into four equal pieces.

[0028] Furthermore, the bottom plate is also provided with a folded edge covering the top plate.

[0029] Furthermore, the outer diameter of the lower sleeve is greater than the diameter of the sphere of the trailer ball, and the outer edge of the arc-shaped notch has an inwardly concave arc surface.

[0030] Further, the connecting rod device comprises a connecting rod seat, a connecting rod body, and a connecting pressure rod, the connecting rod seat is arranged at the top end of the upper sleeve, the bolt body is provided with a long hole, one end of the aforementioned connecting rod body is connected to the top end of the connecting rod seat through a shaft, the other end of the connecting rod is inserted into the long hole through another shaft, one end of the connecting pressure rod is arranged on the oblique side of the connecting rod seat, a pressure plate is provided in the middle section of the connecting pressure rod, and the other end of the connecting pressure rod is connected to the pressure rod device;

[0031] The pressure rod device is connected to the connecting pressure rod, and by pulling the pressure rod device, the connecting pressure rod of the connecting rod device is driven to produce a corresponding action;

[0032] When the pressure rod device is pulled and pushed upward, in this state, the connecting pressure rod of the connecting rod device is driven to be upright, in this state, the connecting rod body is in a movable state, the bolt body is in a descending state, so that the flange head is located at the bottom of the bolt groove, and the covering member is in a loose state in this state;

[0033] When the pressure rod device is pulled and pressed down in the clockwise direction; in this state, the connecting pressure rod of the connecting rod device is driven to be inclined. In this state, the connecting rod body is pressed down by the pressure plate of the connecting pressure rod, so that the bolt body is driven by the connecting rod body to rise, allowing the flange head to touch the top of the bolt groove. The covering part is in a tightened state in this state, and at the same time, the ball is pulled up and the arc-shaped notch is engaged with the buckle ear of the trailer ball, so that the ball clamping fixing structure is stable and combined with the trailer ball without separation.

[0034] Through the above description, the advantages and effects that can be obtained by the present invention are as follows:

[0035] 1. The bell jar is divided into an upper sleeve and a lower sleeve during manufacturing, making the bell jar easy to manufacture and assemble.

[0036] 2. The bell-shaped cover is buckled on the buckle ear of the trailer ball by using an arc-shaped notch, and the distance between the bell-shaped cover and the trailer ball is controlled by using the position of the covering part, so that the ball clamping fixing structure is stable and combined with the trailer ball without separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural stereogram of the present invention;

[0038] Figure 2 is a structural exploded view of the present invention;

[0039] Figure 3 is a schematic diagram of the structure of the combined state of the covering member (I);

[0040] Figure 4 is a schematic diagram of the structure of the combined state of the covering parts (II);

[0041] Figure 5 Schematic diagram of the bell jar assembly state (I);

[0042] Figure 6 Schematic diagram of the bell jar assembly state (II);

[0043] Figure 7 This is an exploded view of the bell housing and trailer ball;

[0044] Figure 8 It is a schematic diagram of the combination of the lower sleeve and the trailer ball;

[0045] Fig. 9 is a perspective view of a second embodiment of the present invention;

[0046] Fig.10 is a partial cross-sectional view of a second embodiment of the present invention, wherein the pressure bar has not yet been pivoted downward;

[0047] Fig.11 is a partial cross-sectional view of a second embodiment of the present invention, wherein the pressure lever is pivoted downward.

[0048] In the figure:

[0049] 10. Trailer ball;

[0050] 11. Sphere;

[0051] 12. L-shaped rod;

[0052] 13. Ear buckle;

[0053] 100. Ball clamping fixing structure;

[0054] 20. Covering parts;

[0055] 21. U-shaped groove;

[0056] 22. Ball slot;

[0057] 23. Pillar;

[0058] 24. Bolt slot;

[0059] 25. Beam ring;

[0060] 30. Bell jar;

[0061] 31. Upper sleeve;

[0062] 311, connecting part;

[0063] 312, bottom plate;

[0064] 313, fold edge;

[0065] 32. Lower sleeve;

[0066] 321, arc-shaped notch;

[0067] 322, top plate;

[0068] 323, camber;

[0069] H. Perforation;

[0070] S, screws;

[0071] M, nut;

[0072] 40. Knob;

[0073] 401, bolt;

[0074] 402, thread;

[0075] 41. Gasket;

[0076] 50. Bolt body;

[0077] 501, internal thread;

[0078] 51. Flange head;

[0079] 52. Long holes;

[0080] 100A, ball clamping fixing structure;

[0081] 60. Connecting rod device;

[0082] 61. Connecting rod seat;

[0083] 611, top;

[0084] 612, bevel;

[0085] 62. Linking rod;

[0086] 63. Connect the pressure rod;

[0087] 631, press plate;

[0088] 70. Pressure rod device;

[0089] R. Shaft. DETAILED DESCRIPTION

[0090] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0091] See also Figures 1 to 6 The ball clamping fixing structure 100 suitable for a trailer ball of the present invention is used to clamp a trailer ball 10. The trailer ball 10 has a sphere 11 and an L-shaped rod 12. The L-shaped rod 12 is connected to the rear end of a car (not shown in the figure). The trailer ball 10 is provided with a buckle ear 13 at a predetermined position.

[0092] The ball clamping fixing structure 100 includes a covering member 20 , a bell-shaped housing 30 , a knob 40 and a bolt body 50 .

[0093] like Figures 2 to 4 As shown, the covering member 20 is installed inside the bell-shaped cover 30. In the embodiment of the present invention, the covering member 20 is divided into four equal pieces (it can also be divided into three pieces according to needs), and a U-shaped groove 21 for connecting the bolt body 50 is provided on the top of the covering member 20. A ball groove 22 for covering the ball 11 of the trailer ball 10 is provided inside the covering member 20. The top of the covering member 20 has a column 23, and the column 23 provides the bolt body 50 for inverted insertion connection. A flange head 51 of the bolt body 50 is set on a bolt groove 24 on the inner side of the column 23, and a collar 25 is provided on the outer side of the column 23 to circle the top of the covering member 20.

[0094] like Figure 2 , Figure 5 , Figure 6 As shown, the basic principle of the bell jar 30 is as follows: the knob 40 is used to pull up the covering member, and the bell jar 30 is used to press the covering member 20 to cover and tighten the sphere 11 of the trailer ball 10, the bolt body 50 penetrates the covering member 20 and the bell jar 30, a bolt 401 penetrates the knob 40, the thread 402 of the bolt 401 is combined with the internal thread 501 of the bolt body 50, and the covering member 20 is pulled up and clamped to the sphere 11 by tightening the knob 40 so that the covering member 20 is pressed against the inner wall of the bell jar 30, so that the carrier frame is tight to the trailer ball 10.

[0095] like Figure 5 , Figure 6As shown, in order to solve the problem of inconvenient manufacturing of the existing structure, the bell-shaped cover 30 is composed of an upper sleeve 31 and a lower sleeve 32. The upper sleeve 31 has an appearance of a conical sleeve, and a connecting portion 311 for connecting to a bicycle frame (not shown) is provided at a predetermined position of the upper sleeve. The bottom end of the upper sleeve 31 is provided with a bottom plate 312, and the lower sleeve 32 has an appearance of a circular ring, and a symmetrically arranged arc-shaped notch 321 corresponding to the buckle ear portion 13 is provided at its bottom end, and a top plate 322 is provided at the top of the lower sleeve 32. The aforementioned bottom plate 312 and top plate 322 are provided with corresponding through holes H. After a plurality of screws S are inserted into the through holes H, a plurality of nuts M are screwed to the screws S, so that the bell-shaped cover 30 is firmly combined.

[0096] like Figure 2 , Figure 5 , Figure 6 As shown, it is worth mentioning that, in order to facilitate processing, the connecting portion 311 and the bottom plate 312 of the upper sleeve 31 are welded to the upper sleeve 31, and the top plate 322 is also welded to the lower sleeve 32. In addition, the bottom plate 312 is further provided with a flange 313 covering the top plate 322.

[0097] The above description is an introduction to the components of the present invention, and the actual application is as follows:

[0098] 1. The trailer ball 10 is installed at the rear end of the car, and the knob 40 is rotated to loosen the connecting bolt 50 to loosen the covering member 20, so that the covering member 20 opens like an umbrella and is inserted into the ball 11 of the trailer ball 10.

[0099] 2. As shown in the third and fourth figures, tightening the knob 40 causes the bolt body 50 to be driven, and the flange head 51 of the bolt body 50 drives the covering member 20 to move upward. Due to the shape of the upper sleeve 31, the ball groove 22 of the covering member 20 is completely and firmly fitted and tightly fastened to the ball body 11 of the trailer ball 10. In a preferred embodiment, in order to avoid over-tightening, a gasket 41 is further provided between the column 23 and the knob to adjust the distance between the covering member 20 and the knob 40.

[0100] 3. Such as Figures 3 to 6 As shown, when the cover 20 moves upward, the bell-shaped cover 30 will move downward due to the rise of the cover 20, so that the arc-shaped notch 321 will be snapped into the buckle ear 13. The outer diameter of the arc-shaped notch 321 is slightly larger than the buckle ear 13, but a pad can be set in the arc-shaped notch 321, which is snapped into the buckle ear 13 to absorb the vibration caused by the uneven road surface and ensure a stable connection between the carrying frame and the vehicle.

[0101] Through the above description, the present invention has the following advantages:

[0102] 1. The bell housing 30 is divided into an upper sleeve 31 and a lower sleeve 32 during manufacturing, so that the bell housing 30 is easy to manufacture and assemble.

[0103] 2. The bell-shaped housing 30 and the covering member 20 clamp the sphere 11 to fix the bicycle carrier up and down.

[0104] 3. The bell-shaped cover 30 is buckled into the buckle ear portion 13 of the trailer ball 10 by using an arc-shaped notch 321, and the position of the covering member 20 is used to control the distance between the bell-shaped cover 30 and the trailer ball 10, so that the ball-clamping fixing structure 100 is stable, combined with the trailer ball 10 without separation, and the carrying frame will not shake left and right.

[0105] 4. Such as Figure 7 , Figure 8 As shown, it is worth mentioning that in the structural principle of the present invention, the outer diameter of the lower sleeve 32 is larger than the diameter of the sphere 11 of the trailer ball 10, and the outer edge of the arc-shaped notch 321 has an inwardly concave arc surface 323, and the distance between the two corresponding arc surfaces 323 is slightly smaller than the length of the two buckle ears. When the knob 40 loosens the bolt body 50, the covering member 20 descends and slightly unfolds and the covering member 20 covers the sphere 11 of the trailer ball 10. In addition, the arc-shaped notch 321 can be snapped on the buckle ear 13 of the trailer ball 10 and increase the tightness.

[0106] like Figures 1 to 8 The disclosed method is to use the rotating knob 40 to drive the bolt body 50 to rise and fall, so that the covering body 20 in the bell-shaped cover 30 is driven to tightly cover or loosen the ball 11 of the trailer ball 10, such as Fig. 9 FIG. 1 is another embodiment of the present invention. Basically, the structure of the trailer ball 10 also includes a ball 11, an L-shaped rod 12 and a pair of buckle ears 13. The ball clamping and fixing structure 100A is composed of a covering member 20, a bell-shaped housing 30, a bolt body 50, a connecting rod device 60 and a pressure rod device 70. In the use method of this embodiment, the bell-shaped housing 30 is mainly used to clamp the trailer ball 10 by pulling the pressure rod device 70, so as to achieve the effect of convenience in use.

[0107] like Fig. 9 , Fig.10 As shown, the structures of the aforementioned covering member 20 and bell housing 30 are basically as follows Figures 1 to 8 The disclosed structure is the same, the structure of the covering member includes a U-shaped groove 21, a ball groove 22, a column 23, a bolt groove 24 and a collar 25; the bell 30 is used to press the covering member 20 to cover and tighten the ball 11 of the trailer ball 10, the flange head 51 arranged at the bottom of the bolt body 50 is arranged on the bolt groove 24 on the inner side of the column 23, and the outer side of the column 23 is circled by the collar 25 on the top of the covering member 20.

[0108] like Fig.10 As shown, the connecting rod device 60 includes a connecting rod seat 61, a connecting rod body 62, and a connecting pressure rod 63. The connecting rod seat 61 is arranged at the top end of the upper sleeve 31, and the bolt body 50 is provided with a long hole 52. One end of the aforementioned connecting rod body 62 is connected to the top end 611 of the connecting rod seat 61 through a shaft member R, and the other end of the connecting rod member 62 is inserted into the long hole 52 through another shaft member R. One end of the connecting pressure rod 63 is arranged on the oblique edge 612 of the connecting rod seat 61, and a pressure plate 631 is provided in the middle section of the connecting pressure rod 63. The other end of the connecting pressure rod 63 is connected to the pressure rod device 70.

[0109] like Fig.10 , Fig.11 As shown, the pressure rod device 70 is connected to the connecting pressure rod 63. By pulling the pressure rod device 70, the connecting pressure rod 63 of the connecting rod device 70 is driven to produce corresponding actions.

[0110] like Fig.10 The state shown is to release the trailer ball 10. First, the pressure rod device 70 is pulled and pushed upward. In this state, the connecting pressure rod 63 of the connecting rod device 60 is driven to stand upright. In this state, the connecting rod body 62 is movable, and the bolt body 50 is in a lowered state, so that the flange head 51 is located at the bottom of the bolt groove 24, and the covering member 20 is in a loose state in this state. In addition, in Fig.10 In order to understand the connection between the lower sleeve 32 and the trailer ball 10, the viewing direction is changed by using one side of the lower sleeve 32 and marked with a dotted frame, which is explained in advance.

[0111] like Fig.11 The state shown is that the trailer ball 10 is clamped, the pressure rod device 70 is pulled and pressed down in the clockwise direction; in this state, the connecting pressure rod 63 of the connecting rod device 60 is driven and becomes inclined, and in this state, the connecting rod body 62 is pressed down by the pressure plate 631 of the connecting pressure rod 63, so that the bolt body 50 is driven by the connecting rod body 62 to rise, allowing the flange head 51 to touch the top of the bolt groove 24, and the covering part 20 is in a tightened state in this state, and at the same time, the ball body 11 is pulled up and the arc-shaped notch 321 is engaged with the buckle ear part 13 of the trailer ball 10, so that the ball clamping fixing structure 100A is stable, combined with the trailer ball 10 without separation, and the carrying frame will not shake left and right.

[0112] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0113] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ball clamping and fixing structure suitable for a trailer ball, used to clamp a trailer ball, the trailer ball having a spherical body and an L-shaped rod, the L-shaped rod being connected to the rear end of a car, and the trailer ball having a buckle ear at a predetermined position; A ball clamping and fixing structure comprises a covering member, a bell-shaped cover, a knob and a bolt body. The bell-shaped cover is provided with a connecting portion at a predetermined position to connect with a vehicle carrying frame. The knob is used to pull the covering member to clamp the trailer ball. The bell-shaped cover is used to press the covering member to cover and tighten the trailer ball. The bolt body is connected with the knob after passing through the covering member and the bell-shaped cover. The covering member is pulled up and clamped to the inner wall of the bell-shaped cover by tightening the knob, so that the vehicle carrying frame is fastened to the trailer ball. The characteristics are as follows: The bell-shaped cover is composed of an upper sleeve and a lower sleeve. The bottom end of the upper sleeve is provided with a bottom plate, the bottom end of the lower sleeve is provided with a symmetrically arranged arc-shaped notch corresponding to the buckle ear, and the top end of the lower sleeve is provided with a top plate. The bottom plate and the top plate are provided with corresponding through holes. After a plurality of screws are inserted into these through holes, a plurality of nuts are screwed on these screws to ensure that the bell-shaped cover is firmly combined.

2. A ball clamping and fixing structure suitable for a trailer ball according to claim 1, characterized in that: The connecting portion and the bottom plate of the upper sleeve are welded to the upper sleeve, and the top plate is also connected to the lower sleeve by welding.

3. The ball clamping and fixing structure suitable for a trailer ball according to claim 1, characterized in that: The bottom plate is also provided with a folded edge covering the top plate.

4. The ball clamping and fixing structure suitable for a trailer ball according to claim 1, characterized in that: The outer diameter of the lower sleeve is greater than the diameter of the sphere of the trailer ball, and the outer edge of the arc-shaped notch has an inwardly concave arc surface.

5. A ball clamping and fixing structure suitable for a trailer ball, characterized in that: Used to clamp a trailer ball, the trailer ball includes a ball and an L-shaped rod, the L-shaped rod is connected to the rear end of a car, and the trailer ball is provided with a buckle ear at a predetermined position; A ball clamping fixing structure includes a covering member, a bell-shaped housing, a knob and a bolt body. The covering member is installed inside the bell-shaped housing. The covering member is divided into three equal pieces, and a U-shaped groove for connecting the bolt body is provided on the top of the covering member. A ball groove for covering the trailer ball is provided inside the covering member. The top of the covering member has a column, and the column provides an inverted plug connection for the bolt body. A flange head of the bolt body is arranged on a bolt groove inside the column, and a tie ring is provided on the outside of the column to fix the top of the covering member; The knob is used to pull up the covering member, and the bell-shaped housing is used to press the covering member to cover and tighten the trailer ball. After the bolt body penetrates the covering member and the bell-shaped housing, it is combined with the knob. By tightening the knob, the covering member is pressed against the bell-shaped housing so that the carrier frame is fastened to the trailer ball. The bell-shaped cover includes an upper sleeve and a lower sleeve. The upper sleeve is in the shape of a conical sleeve. A connecting portion for connecting to a bicycle frame is provided at a predetermined position of the upper sleeve. A bottom plate is provided at the bottom end of the upper sleeve. The lower sleeve is in the shape of a circular ring and a symmetrically arranged arc-shaped notch corresponding to the buckle ear is provided at the bottom end. A top plate is provided at the top end of the lower sleeve. The bottom plate and the top plate are provided with corresponding through holes. After a plurality of screws are inserted into the through holes, a plurality of nuts are screwed to the screws to ensure a stable combination of the bell-shaped cover.

6. The ball clamping and fixing structure for a trailer ball according to claim 5, characterized in that: The connecting portion and the bottom plate of the upper sleeve are welded to the upper sleeve, and the top plate is also connected to the lower sleeve by welding.

7. The ball clamping and fixing structure suitable for a trailer ball according to claim 5, characterized in that: A gasket is also arranged between the column and the knob to adjust the distance between the covering part and the knob.

8. The ball clamping and fixing structure suitable for a trailer ball according to claim 5, characterized in that: The cover can be divided into four equal pieces.

9. The ball clamping and fixing structure suitable for a trailer ball according to claim 5, characterized in that: The bottom plate is also provided with a folded edge covering the top plate.

10. The ball clamping and fixing structure suitable for a trailer ball according to claim 5, characterized in that: The outer diameter of the lower sleeve is greater than the diameter of the sphere of the trailer ball, and the outer edge of the arc-shaped notch has an inwardly concave arc surface.

11. A ball clamping and fixing structure suitable for a trailer ball, characterized in that: Used to clamp a trailer ball, the trailer ball consists of a sphere and an L-shaped rod, the L-shaped rod is connected to the rear end of a car, and the trailer ball is provided with a buckle ear at a predetermined position; A ball clamping and fixing structure includes a covering member, a bell-shaped housing, a bolt body, a connecting rod device and a pressure rod device. The covering member is installed inside the bell-shaped housing. The covering member is divided into three equal pieces, and a U-shaped groove for connecting the bolt body is provided on the top of the covering member. A ball groove for covering the trailer ball is provided inside the covering member. The top of the covering member has a column, and the column provides an inverted plug connection for the bolt body. A flange head of the bolt body is arranged on a bolt groove inside the column, and a tie ring is provided on the outside of the column to fix the top of the covering member; The connecting rod device and the pressing rod device are used to pull up the covering member, and the bell-shaped cover is used to press the covering member to cover and tighten the trailer ball. After the bolt body penetrates the covering member and the bell-shaped cover, it is combined with the connecting rod device. The pressing rod device drives the connecting rod device to tighten the covering member to the bell-shaped cover so that the vehicle carrier is fastened to the trailer ball. The bell-shaped cover is composed of an upper sleeve and a lower sleeve. The upper sleeve is in the shape of a conical sleeve. A connecting portion for connecting to the vehicle frame is provided at a predetermined position of the upper sleeve. A bottom plate is provided at the bottom end of the upper sleeve. The lower sleeve is in the shape of a circular ring. A symmetrically arranged arc-shaped notch corresponding to the buckle ear is provided at the bottom end. A top plate is provided at the top end of the lower sleeve. Corresponding through holes are provided on the aforementioned bottom plate and top plate. After a plurality of screws are inserted into the through holes, a plurality of nuts are screwed to the screws to ensure that the bell-shaped cover is firmly combined.

12. The ball clamping and fixing structure suitable for a trailer ball according to claim 11, characterized in that: The connecting portion and the bottom plate of the upper sleeve are welded to the upper sleeve, and the top plate is also connected to the lower sleeve by welding.

13. The ball clamping and fixing structure suitable for a trailer ball according to claim 11, characterized in that: The cover can be divided into four equal pieces.

14. The ball clamping and fixing structure suitable for a trailer ball according to claim 11, characterized in that: The bottom plate is also provided with a folded edge covering the top plate.

15. The ball clamping and fixing structure suitable for a trailer ball according to claim 11, characterized in that: The outer diameter of the lower sleeve is greater than the diameter of the sphere of the trailer ball, and the outer edge of the arc-shaped notch has an inwardly concave arc surface.

16. The ball clamping and fixing structure suitable for a trailer ball according to claim 11, characterized in that: The connecting rod device comprises a connecting rod seat, a connecting rod body, and a connecting pressure rod. The connecting rod seat is arranged at the top end of the upper sleeve, the bolt body is provided with a long hole, one end of the aforementioned connecting rod body is connected to the top end of the connecting rod seat through a shaft, and the other end of the connecting rod body is inserted into the long hole through another shaft, one end of the connecting pressure rod is arranged on the oblique side of the connecting rod seat, a pressure plate is provided in the middle section of the connecting pressure rod, and the other end of the connecting pressure rod is connected to the pressure rod device; The pressure rod device is connected to the connecting pressure rod, and by pulling the pressure rod device, the connecting pressure rod of the connecting rod device is driven to produce a corresponding action; When the pressure rod device is pulled and pushed upward, in this state, the connecting pressure rod of the connecting rod device is driven to be upright, in this state, the connecting rod body is in a movable state, the bolt body is in a descending state, so that the flange head is located at the bottom of the bolt groove, and the covering member is in a loose state in this state; When the pressure rod device is pulled and pressed down in the clockwise direction; in this state, the connecting pressure rod of the connecting rod device is driven to be inclined. In this state, the connecting rod body is pressed down by the pressure plate of the connecting pressure rod, so that the bolt body is driven by the connecting rod body to rise, allowing the flange head to touch the top of the bolt groove. The covering part is in a tightened state in this state, and at the same time, the ball is pulled up and the arc-shaped notch is engaged with the buckle ear of the trailer ball, so that the ball clamping fixing structure is stable and combined with the trailer ball without separation.

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