An airbag suspension structure for a semi-trailer

Abstract

The present application discloses an airbag suspension structure for a semi-trailer, including a suspension assembly and an airbag mounted on the suspension assembly. The suspension assembly includes a top plate, a bottom plate, a starting mechanism, and a backup shock absorption mechanism; the airbag is disposed between the top plate and the bottom plate; the starting mechanism includes a limiting unit and a plug plate fixed to the lower surface of the top plate; the backup shock absorption mechanism includes a limiting ring and a backup spring both sleeved on the airbag. The lower end of the backup spring is fixed to the upper surface of the bottom plate, and the upper end of the backup spring is fixed to the lower surface of the limiting ring. The limiting unit is snap-connected to the limiting ring, and the backup spring is in a compressed state; when the airbag is compressed to the ultimate compression height of the airbag, the plug plate causes the limiting ring to move upward through the limiting unit and makes the limiting ring contact the top plate. The present application solves the problem that the semi-trailer loses its shock absorption function when the airbag in the prior art cannot work properly, and the present application can ensure the driving smoothness of the semi-trailer.

Description

Technical Field

[0001] This application belongs to the technical field of air suspension, and particularly relates to an airbag suspension structure for a semi-trailer. Background Art

[0002] Semi-trailers are mainly used to transport large-sized goods that are difficult to disassemble, such as excavators, etc. Fence semi-trailers are more suitable for transporting fresh goods, such as vegetables, fruits, etc. Van semi-trailers are more suitable for transporting bulk goods and moisture-proof valuable goods. Different from full trailers, when a semi-trailer is evenly loaded, its axles are placed behind the center of gravity of the vehicle, and it is a trailer equipped with a coupling device that can transfer horizontal or vertical forces to the tractor.

[0003] When a semi-trailer passes through an uneven road surface, shock-absorbing springs are usually used to filter the vibrations of the road surface, and shock absorbers are used to suppress the reciprocating movement of the springs themselves, thereby accelerating the attenuation of the vibration of the semi-trailer frame and body and improving the ride comfort of the semi-trailer. Existing shock-absorbing springs usually include airbags, springs or spring plates. The airbag is connected to the vehicle body through a suspension structure. The airbag has the advantages of light weight, liftable, and smooth driving. Semi-trailers usually carry a large loading weight. When the loading weight of a semi-trailer is large, it causes great damage to the airbag, reduces the service life of the airbag. At the same time, when the airbag is compressed to the limit compression height of the airbag, the airbag will burst, resulting in the problem that the airbag cannot work properly, and further affecting the normal use of the airbag on the semi-trailer. Summary of the Invention

[0004] By providing an airbag suspension structure for a semi-trailer in an embodiment of this application, the problem that the semi-trailer loses its shock-absorbing function when the airbag cannot work properly in the prior art is solved.

[0005] An embodiment of the present invention provides an airbag suspension structure for a semi-trailer, including a suspension assembly and an airbag installed on the suspension assembly. The suspension assembly includes a top plate, a bottom plate, a starting mechanism, and a spare shock-absorbing mechanism;

[0006] The airbag is disposed between the top plate and the bottom plate;

[0007] The starting mechanism includes a limiting unit and a plug board fixed to the lower surface of the top plate;

[0008] The spare shock-absorbing mechanism includes a limiting ring and a spare spring both sleeved on the airbag. The lower end of the spare spring is fixed to the upper surface of the bottom plate, the upper end of the spare spring is fixed to the lower surface of the limiting ring, the limiting unit is snap-connected to the limiting ring, and the spare spring is in a compressed state;

[0009] When the airbag is compressed to the ultimate compression height of the airbag, the insertion plate makes the limit ring move upward through the limit unit, and makes the limit ring contact with the top plate.

[0010] In a possible implementation manner, the limit unit includes a column, a locking spring, and a locking tongue;

[0011] The column is fixed on the upper surface of the bottom plate, and a gap for the insertion plate to pass through is provided between the column and the limit ring;

[0012] A blind hole is provided at the upper end of the column, the orifice of the blind hole faces the limit ring, a locking spring is provided at the rear part in the blind hole, a locking tongue is provided at the front part in the blind hole, one end of the locking spring abuts against the rear end face of the locking tongue, and the other end of the locking spring abuts against the bottom wall of the blind hole;

[0013] An upper part of the front end of the locking tongue is provided with a first inclined surface that cooperates with the insertion plate, a lower surface of the front end of the locking tongue is provided with a clamping surface that cooperates with the upper surface of the limit ring, and a limit boss that cooperates with the closing structure of the orifice of the blind hole is provided in the middle of the locking tongue.

[0014] In a possible implementation manner, it further includes a safety mechanism, and the safety mechanism includes a vertical plate, a horizontal plate, and a limit plate;

[0015] The upper end of the vertical plate is connected to the lower surface of the top plate, one end of the horizontal plate faces one side of the limit ring, and the other end of the horizontal plate is hingedly connected to the lower end of the vertical plate;

[0016] The cross section of the limit plate is an L-shaped structure, the vertical section of the limit plate is fixed on the side of the vertical plate away from the airbag, and a limit surface that abuts against the lower surface of the horizontal plate is provided on the upper surface of the horizontal section of the limit plate.

[0017] In a possible implementation manner, a second inclined surface that cooperates with the first inclined surface is provided at the lower end of the insertion plate.

[0018] In a possible implementation manner, the cross sections of the top plate and the bottom plate are rectangular structures, and two sets of the starting mechanisms and two sets of the safety mechanisms are provided on both sides of the top plate.

[0019] In a possible implementation manner, it further includes guide posts provided at the four corners of the top plate. The guide posts include inner rods with the upper ends connected to the lower surface of the top plate and sleeves with the lower ends connected to the upper surface of the bottom plate. The lower ends of the inner rods are located inside the sleeves, an annular boss is provided on the outer side of the lower ends of the inner rods, and a closing structure that cooperates with the annular boss is provided on the inner side of the upper ends of the sleeves.

[0020] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0021] The embodiments of the present invention provide an airbag suspension structure for a semi-trailer. When the suspension structure is in use, the spare spring is in a compressed state. When the loading weight of the semi-trailer is large and the airbag is compressed to the limit compression height of the airbag, the airbag bursts. The insertion plate makes the limit ring move upward through the limit unit and makes the limit ring contact the top plate. At this time, the spare spring stretches, and the spare spring forms a new shock-absorbing spring, thereby realizing the adjustment of the state of the spare shock-absorbing mechanism, replacing the scrapped airbag. At this time, the semi-trailer filters the vibrations of the road surface through the compression and recovery of the spare spring, thereby ensuring the driving smoothness of the semi-trailer. The airbag suspension structure of the present invention can start the spare spring to filter vibrations when the airbag cannot work properly, thereby avoiding the problem that the airbag bursts and the semi-trailer loses the shock-absorbing function, resulting in large driving vibrations. The airbag suspension structure of the present invention is easy to implement, has a simple structure, and strong practicability, and can ensure the driving smoothness of the semi-trailer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of the airbag suspension structure of the semi-trailer provided by the embodiment of the present invention.

[0024] Figure 2 is Figure 1 the right view of.

[0025] Figure 3 is Figure 2 the A-A cross-sectional view of.

[0026] Figure 4 is Figure 3 the enlarged view at C of.

[0027] Figure 5 is Figure 2 the B-B cross-sectional view of.

[0028] Figure 6 is Figure 5 the enlarged view at D of.

[0029] Figure 7 It is a schematic diagram of the state when the airbag provided by the embodiment of the present invention is compressed to the limit compression height of the airbag.

[0030] Figure 8 This is a schematic diagram of the state of the spare spring provided by the embodiment of the present invention when it is used as a shock-absorbing spring of the airbag suspension structure of a semi-trailer.

[0031] Reference numerals: 1 - airbag; 2 - top plate; 3 - bottom plate; 4 - starting mechanism; 41 - limiting unit; 411 - column; 412 - locking spring; 413 - locking tongue; 4131 - first inclined surface; 4132 - clamping surface; 414 - blind hole; 42 - insertion plate; 421 - second inclined surface; 5 - spare shock-absorbing mechanism; 51 - limiting ring; 52 - spare spring; 6 - insurance mechanism; 61 - vertical plate; 62 - horizontal plate; 63 - limiting plate; 7 - guiding column; 71 - inner rod; 72 - sleeve. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. The terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0034] As Figures 1 to 8 shown, the airbag suspension structure of the semi-trailer provided by the embodiment of the present invention includes a suspension assembly and an airbag 1 installed on the suspension assembly. The suspension assembly includes a top plate 2, a bottom plate 3, a starting mechanism 4, and a spare shock-absorbing mechanism 5.

[0035] The airbag 1 is disposed between the top plate 2 and the bottom plate 3. The upper and lower ends of the airbag 1 are respectively connected to the top plate 2 and the bottom plate 3.

[0036] The starting mechanism 4 includes a limiting unit 41 and a plug board 42 fixed to the lower surface of the top plate 2.

[0037] The spare shock absorption mechanism 5 includes a limiting ring 51 and a spare spring 52 both sleeved on the airbag 1. The lower end of the spare spring 52 is fixed to the upper surface of the bottom plate 3, and the upper end of the spare spring 52 is fixed to the lower surface of the limiting ring 51. The limiting unit 41 is snap-connected to the limiting ring 51, and the spare spring 52 is in a compressed state.

[0038] When the airbag 1 is compressed to the limit compression height of the airbag 1, the plug board 42 makes the limiting ring 51 move upward through the limiting unit 41 and makes the limiting ring 51 contact the top plate 2.

[0039] It should be noted that when the airbag 1 suspension structure of the present invention is used in cooperation with a shock absorber, the driving smoothness of the semi-trailer can be improved. The sizes of the components involved in the present invention are adjusted according to actual needs.

[0040] The airbag 1 filters the vibrations of the road surface by its own compression and recovery. When the airbag 1 is working normally, the spare spring 52 is in a compressed state. When the loading weight of the semi-trailer is relatively large and the airbag 1 is compressed to the limit compression height of the airbag 1 (when the airbag 1 loses its shock absorption function, the semi-trailer will also compress the airbag 1 to its limit compression height during driving), the airbag 1 bursts. The plug board 42 makes the limiting ring 51 move upward through the limiting unit 41 and makes the limiting ring 51 contact the top plate 2. At this time, the spare spring 52 extends, and the spare spring 52 forms a new shock absorption spring, thereby realizing the adjustment of the state of the spare shock absorption mechanism 5, replacing the scrapped airbag 1. At this time, the semi-trailer filters the vibrations of the road surface through the compression and recovery of the spare spring 52, so as to ensure the driving smoothness of the semi-trailer. The airbag 1 suspension structure of the present invention can start the spare spring 52 to filter vibrations when the airbag 1 cannot work normally, thereby avoiding the problem that the airbag 1 bursts and the semi-trailer loses its shock absorption function, resulting in large driving vibrations. The airbag 1 suspension structure of the present invention is easy to implement, has a simple structure, and strong practicability, and can ensure the driving smoothness of the semi-trailer.

[0041] In this embodiment, the limiting unit 41 includes a column 411, a locking spring 412, and a locking tongue 413.

[0042] The column 411 is fixed to the upper surface of the bottom plate 3, and a gap for the plug board 42 to pass through is provided between the column 411 and the limiting ring 51.

[0043] A blind hole 414 is provided at the upper end of the column 411, the orifice of the blind hole 414 faces the limiting ring 51, a locking spring 412 is provided at the rear part inside the blind hole 414, a locking tongue 413 is provided at the front part inside the blind hole 414, one end of the locking spring 412 abuts against the rear end face of the locking tongue 413, and the other end of the locking spring 412 abuts against the bottom wall of the blind hole 414.

[0044] On the upper part of the front end of the locking tongue 413, there is a first inclined surface 4131 that cooperates with the insertion plate 42, on the lower surface of the front end of the locking tongue 413, there is a clamping surface 4132 that cooperates with the upper surface of the limiting ring 51, and at the middle part of the locking tongue 413, there is a limiting boss that cooperates with the closing structure of the orifice of the blind hole 414.

[0045] It should be noted that the limiting unit 41 can also be other structures capable of clamping the limiting ring 51, such as an electrically driven snap ring structure, etc.

[0046] When the airbag 1 is working normally, the spare spring 52 is in a compressed state. The spare shock absorption mechanism 5 is in a standby state. At this time, under the action of the locking spring 412, the front end of the locking tongue 413 extends out of the orifice of the blind hole 414, so that the clamping surface 4132 at the front end of the locking tongue 413 abuts against the upper surface of the limiting ring 51, and further makes the limiting unit 41 and the limiting ring 51 be clamped and connected, thereby fixing the position of the limiting ring 51 and keeping the spare spring 52 in a compressed state.

[0047] When the airbag 1 is compressed to the limit compression height of the airbag 1, the airbag 1 bursts. During this process, when the insertion plate 42 moves downward, the lower end of the insertion plate 42 contacts the first inclined surface 4131 at the front end of the locking tongue 413, and the insertion plate 42 presses the locking tongue 413 to move into the blind hole 414. Furthermore, the insertion plate 42 moves downward to the gap between the column 411 and the limiting ring 51. At this time, the locking tongue 413 retracts into the blind hole 414. The limiting ring 51 loses the restraint of the locking tongue 413, and under the action of the spare spring 52, the limiting ring 51 moves towards the top plate 2, so that the spare spring 52 becomes the shock absorption spring of the new semi-trailer.

[0048] In this embodiment, an insurance mechanism 6 is further included. The insurance mechanism 6 includes a vertical plate 61, a horizontal plate 62, and a limiting plate 63. The upper end of the vertical plate 61 is connected to the lower surface of the top plate 2, one end of the horizontal plate 62 faces one side of the limiting ring 51, and the other end of the horizontal plate 62 is hingedly connected to the lower end of the vertical plate 61.

[0049] The cross-section of the limiting plate 63 is an L-shaped structure. The vertical section of the limiting plate 63 is fixed to the side of the vertical plate 61 away from the airbag 1, and the upper surface of the horizontal section of the limiting plate 63 is provided with a limiting surface that abuts against the lower surface of the horizontal plate 62.

[0050] It should be noted that when the limiting ring 51 moves towards the top plate 2 under the action of the spare spring 52, the upper surface of the limiting ring 51 abuts against the lower surface of the horizontal section of the horizontal plate 62. Since the limiting plate 63 enables the horizontal section of the horizontal plate 62 to only rotate upwards, the horizontal section of the horizontal plate 62 rotates upwards. When the lower surface of the limiting ring 51 is higher than the horizontal plate 62, the horizontal section of the horizontal plate 62 returns to the horizontal state. At this time, the limiting surface of the limiting plate 63 abuts against the upper surface of the horizontal plate 62, and the limiting ring 51 is located above the horizontal plate 62.

[0051] In actual use, the limiting ring 51 and the safety mechanism 6 may not be in contact, and the spare spring 52 is always in a compressed state. However, due to the positional relationship between the horizontal plate 62 and the limiting ring 51, the limiting ring 51 will not disengage or move to other positions when the suspension structure is in use, thus well restricting the position of the spare spring 52 and ensuring the use function of the spare spring 52. Therefore, the safety mechanism 6 improves the reliability of the suspension structure.

[0052] In this embodiment, the lower end of the insertion plate 42 is provided with a second inclined surface 421 that cooperates with the first inclined surface 4131.

[0053] It should be noted that the insertion plate 42 can be made of a self-lubricating material. The inclination angles of the first inclined surface 4131 and the second inclined surface 421 are the same, that is, the first inclined surface 4131 and the second inclined surface 421 are in surface contact.

[0054] Setting the second inclined surface 421 that cooperates with the first inclined surface 4131 can make the insertion plate 42 easily press the locking tongue 413 into the blind hole 414 to achieve the purpose of retracting the locking tongue 413 into the blind hole 414.

[0055] In this embodiment, the cross-sections of the top plate 2 and the bottom plate 3 are rectangular structures, and two sets of starting mechanisms 4 and two sets of safety mechanisms 6 are provided on both sides of the top plate 2.

[0056] It should be noted that the starting mechanisms 4 and the safety mechanisms 6 can be provided around the entire perimeter of the top plate 2. The two sets of starting mechanisms 4 and the two sets of safety mechanisms 6 are symmetrically arranged, which can improve the reliability of the spare shock absorption mechanism 5.

[0057] The cross-sections of the top plate 2 and the bottom plate 3 can also be circular structures. The starting mechanisms 4 and the safety mechanisms 6 are both multiple groups, and the multiple groups of starting mechanisms 4 and the multiple groups of safety mechanisms 6 are evenly distributed in the circumferential direction of the top plate 2.

[0058] In this embodiment, it further includes guide posts 7 provided at the four corners of the top plate 2. The guide posts 7 include inner rods 71 with the upper ends connected to the lower surface of the top plate 2 and sleeves 72 with the lower ends connected to the upper surface of the bottom plate 3. The lower ends of the inner rods 71 are located inside the sleeves 72, and annular bosses are provided on the outer sides of the lower ends of the inner rods 71. The inner sides of the upper ends of the sleeves 72 are provided with a closing structure that cooperates with the annular bosses.

[0059] It should be noted that the inner rod 71 can move up and down within the sleeve 72. The annular boss and the necking structure can prevent the inner rod 71 from slipping out of the sleeve 72. The guide post 7 can improve the safety of the airbag 1 suspension structure during use. At the same time, when the spare spring 52 is in use, it can further limit the position of the spare spring 52 and improve the reliability of the suspension structure.

[0060] The guide post 7 can also be composed of nested rings. The suspension assembly and the airbag 1 are located inside the nested rings. The nested rings can prevent external objects from damaging the suspension assembly and the airbag 1, and can also prevent impurities from entering the suspension assembly and the airbag 1.

[0061] When the airbag suspension structure of the semi-trailer of the present invention is in use, the spare spring is in a compressed state. When the loading weight of the semi-trailer is relatively large and the airbag is compressed to the limit compression height of the airbag, the airbag bursts. The insertion plate makes the limit ring move upward through the limit unit and makes the limit ring contact the top plate. At this time, the spare spring extends, and the spare spring forms a new shock-absorbing spring, thereby realizing the adjustment of the state of the spare shock-absorbing mechanism, replacing the scrapped airbag. At this time, the semi-trailer filters the vibrations of the road surface through the compression and recovery of the spare spring, thereby ensuring the driving smoothness of the semi-trailer. The airbag suspension structure of the present invention can start the spare spring to filter vibrations when the airbag cannot work properly, thereby avoiding the problem that the airbag bursts and the semi-trailer loses its shock-absorbing function, resulting in large driving vibrations. The airbag suspension structure of the present invention is easy to implement, has a simple structure, and strong practicability, and can ensure the driving smoothness of the semi-trailer.

[0062] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, reference can be made to each other. The key points of each embodiment are the differences from other embodiments.

[0063] The above are only the preferred embodiments of the present invention, and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An airbag suspension structure for a semi-trailer, characterized in that: Comprising a suspension assembly and an airbag (1) mounted on the suspension assembly, the suspension assembly including a top plate (2), a bottom plate (3), a starting mechanism (4), and a spare shock absorption mechanism (5); The airbag (1) is disposed between the top plate (2) and the bottom plate (3); The starting mechanism (4) includes a limiting unit (41) and a plug plate (42) fixed to the lower surface of the top plate (2); The spare shock absorption mechanism (5) includes a limiting ring (51) and a spare spring (52) both sleeved on the airbag (1), the lower end of the spare spring (52) being fixed to the upper surface of the bottom plate (3), the upper end of the spare spring (52) being fixed to the lower surface of the limiting ring (51), the limiting unit (41) being snap-connected to the limiting ring (51), and the spare spring (52) being in a compressed state; When the airbag (1) is compressed to the ultimate compression height of the airbag (1), the plug plate (42) causes the limiting ring (51) to move upward through the limiting unit (41), and makes the limiting ring (51) contact the top plate (2); The limiting unit (41) includes a column (411), a locking spring (412), and a locking tongue (413); The column (411) is fixed to the upper surface of the bottom plate (3), and a gap for the plug plate (42) to pass through is provided between the column (411) and the limiting ring (51); A blind hole (414) is provided at the upper end of the column (411), the orifice of the blind hole (414) faces the limiting ring (51), the locking spring (412) is provided at the rear part in the blind hole (414), the locking tongue (413) is provided at the front part in the blind hole (414), one end of the locking spring (412) abuts against the rear end face of the locking tongue (413), and the other end of the locking spring (412) abuts against the bottom wall of the blind hole (414); An upper part of the front end of the locking tongue (413) is provided with a first inclined surface (4131) for cooperating with the plug plate (42), a lower surface of the front end of the locking tongue (413) is provided with a clamping surface (4132) for cooperating with the upper surface of the limiting ring (51), and a limiting boss for cooperating with the closing structure of the orifice of the blind hole (414) is provided in the middle of the locking tongue (413); It further includes a safety mechanism (6), the safety mechanism (6) including a vertical plate (61), a horizontal plate (62), and a limiting plate (63); The upper end of the vertical plate (61) is connected to the lower surface of the top plate (2), one end of the horizontal plate (62) faces one side of the limiting ring (51), and the other end of the horizontal plate (62) is hingedly connected to the lower end of the vertical plate (61); The cross section of the limiting plate (63) is an L-shaped structure, the vertical section of the limiting plate (63) is fixed to the side of the vertical plate (61) away from the airbag (1), and a limiting surface for abutting against the lower surface of the horizontal plate (62) is provided on the upper surface of the horizontal section of the limiting plate (63); The lower end of the plug board (42) is provided with a second inclined surface (421) that cooperates with the first inclined surface (4131).

2. The airbag suspension structure of the semi-trailer according to claim 1, characterized in that: The cross-sections of the top plate (2) and the bottom plate (3) are rectangular structures, and two sets of the starting mechanisms (4) and two sets of the safety mechanisms (6) are arranged on both sides of the top plate (2).

3. The airbag suspension structure of the semi-trailer according to claim 2, characterized in that: It further includes guide columns (7) arranged at the four corners of the top plate (2). The guide columns (7) include inner rods (71) with upper ends connected to the lower surface of the top plate (2) and sleeves (72) with lower ends connected to the upper surface of the bottom plate (3). The lower ends of the inner rods (71) are located inside the sleeves (72). An annular boss is arranged on the outer side of the lower end of the inner rod (71), and a necking structure that cooperates with the annular boss is arranged on the inner side of the upper end of the sleeve (72).

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