Trailer single-point suspension system adopting variable cross-section plate springs

Abstract

The utility model relates to the technical field of suspension systems, in particular to a trailer single-point suspension system adopting a variable cross-section plate spring, which comprises a mounting top plate, a connecting column connected to the bottom of the mounting top plate, a mounting bottom plate fixedly connected to the lower end of the connecting column, a variable cross-section plate spring arranged on the lower side of the mounting bottom plate, and side frames fixedly connected to two sides of the connecting column. A suspension self-checking mechanism is mounted on the lower side of the side frame; the suspension self-checking mechanism comprises a screw connection disc, a sleeve is fixedly installed at the bottom of the screw connection disc, a sliding rod is slidably installed on the inner side of the sleeve, a rotating groove is fixedly installed at the bottom of the sliding rod, rollers are rotatably installed on the inner side of the rotating groove, a spring is fixedly installed at the end of the sliding rod, and a pressure sensor is fixedly connected to the end of the spring. The suspension self-checking mechanism can monitor whether the variable cross-section plate spring suspension system is used normally or not in real time, if abnormity is found, the vehicle machine system gives an alarm to remind timely maintenance, and the use functionality of the variable cross-section plate spring suspension system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of suspension systems, in particular to a single-point suspension system for trailers using variable cross-section leaf springs. Background Art

[0002] A single-point suspension system for trailers is a suspension design that simplifies the traditional multi-bracket leaf spring into a single bracket and disperses the stress points to different axles.

[0003] The utility model patent with the authorized announcement number CN202923324U discloses a single-point suspension system for trailers using variable cross-section leaf springs, including a leaf spring assembly formed by stacking multiple leaf springs. The leaf spring assembly is fixed on a balance shaft and is supported by the balance shaft at a single point. The balance shaft is rotatably connected to the mounting bracket. The cross-sectional area of each leaf spring changes along the length direction, being larger in the middle and gradually decreasing towards both ends. There is a gap between the leaf springs at the variable cross-section position. The advantages of the utility model are that the leaf spring assembly only needs to stack fewer leaf springs, the overall assembly quality is reduced, the overall height is reduced, materials are saved, installation is facilitated, production costs are reduced, and the installation height of the mounting bracket of the balance shaft can be reduced, improving the safety and stability during the driving of the trailer and reducing fuel consumption. On the other hand, since there is a gap between the leaf springs at the variable cross-section position, mutual sliding friction between the leaf springs can be avoided, noise can be eliminated, the driving smoothness of the vehicle can be improved, the contact fatigue of the leaf springs can be reduced, and the fatigue life can be increased significantly.

[0004] In the above patent, the variable cross-section leaf springs are symmetrically arranged, and axles are installed at both ends. In actual applications, it is difficult to make a self-check judgment on the operating conditions of the variable cross-section leaf springs. If the variable cross-section leaf springs are in a large eccentric working condition for a long time, their service life will be greatly reduced, and the damping effect of the variable cross-section leaf springs will also be affected. To solve the above technical drawbacks, we propose a single-point suspension system for trailers using variable cross-section leaf springs. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the disadvantages in the prior art, and a single-point suspension system for trailers using variable cross-section leaf springs is proposed.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A single-point suspension system for a trailer using a variable cross-section leaf spring, including a mounting top plate. A connecting column is connected to the bottom of the mounting top plate. The lower end of the connecting column is fixedly connected to a mounting bottom plate. A variable cross-section leaf spring is arranged on the lower side of the mounting bottom plate. Side frames are fixedly connected to both sides of the connecting column. A suspension self-checking mechanism is installed on the lower side of the side frames. The suspension self-checking mechanism includes a screwed disc. A sleeve is fixedly installed at the bottom of the screwed disc. A sliding rod is slidably installed inside the sleeve. A rotating groove is fixedly installed at the bottom of the sliding rod. A roller is rotatably installed inside the rotating groove. A spring is fixedly installed at the end of the sliding rod. The end of the spring is fixedly connected to a pressure sensor. The pressure sensor is fixedly installed inside the sleeve. A triaxial accelerometer is fixedly installed on the side wall of the connecting column.

[0008] Preferably, both the pressure sensor and the triaxial accelerometer are connected to the vehicle-mounted control system.

[0009] By adopting the above technical solution, the data measured by the pressure sensor and the triaxial accelerometer can both be reflected in the vehicle-mounted system. The vehicle-mounted system judges whether the working condition of the variable cross-section leaf spring is normal through the data.

[0010] Preferably, mounting holes are provided on the mounting top plate.

[0011] Preferably, a first hoop groove is screwed and installed at the bottom of the mounting bottom plate. The first hoop groove is sleeved outside the variable cross-section leaf spring.

[0012] By adopting the above technical solution, the first hoop groove installs the variable cross-section leaf spring at the bottom of the mounting bottom plate.

[0013] Preferably, hoops are symmetrically sleeved on the variable cross-section leaf spring.

[0014] Preferably, a limiting groove is fixedly connected to the outer end of the variable cross-section leaf spring. A top seat is arranged on the upper side of the limiting groove. A second hoop groove is screwed and installed on the lower side of the top seat.

[0015] By adopting the above technical solution, the limiting groove restricts the sliding freedom of the screwed-together whole of the top seat and the second hoop groove on the variable cross-section leaf spring.

[0016] Preferably, an axle mounting cylinder is fixedly connected to the bottom of the second hoop groove.

[0017] Preferably, the screwed disc is screwed and installed at the bottom of the side frame.

[0018] By adopting the above technical solution, the entire suspension self-checking mechanism is convenient to be installed and detachable at the bottom of the side frame, which is convenient for later maintenance work.

[0019] Preferably, the roller is made of rubber.

[0020] Preferably, a limiting strip is fixedly connected to the inside of the sleeve, a limiting groove is correspondingly arranged on the side wall of the sliding rod, and the limiting strip is in sliding contact with the inner side wall of the limiting groove.

[0021] By adopting the above technical solution, the cooperation setting of the limiting strip and the limiting groove restricts the rotational freedom of the sliding rod inside the sleeve.

[0022] Compared with the related art, a single-point suspension system for trailers using variable cross-section leaf springs proposed by the present utility model has the following beneficial effects:

[0023] In the present utility model, for a single-point suspension system for trailers using variable cross-section leaf springs, through the provided suspension self-checking mechanism, when the variable cross-section leaf spring works, due to the supporting effect on the bottom axle, both sides at the bottom of the variable cross-section leaf spring will deform. When the vehicle is driving on a normal road section, the deformation amplitudes on both sides of the variable cross-section leaf spring should be consistent and symmetrical. When the variable cross-section leaf spring bends upward and deforms, the variable cross-section leaf spring will squeeze the roller to drive the sliding rod to slide inwardly into the sleeve, thereby driving the spring to contract, generating pressure on the pressure sensor at the upper end of the spring, and thus the pressure values generated on the pressure sensors inside the sleeves on both sides of the connecting column are close to each other. If the pressure values fed back by the pressure sensors on both sides to the vehicle-mounted system differ greatly, it indicates that there is an eccentric and asymmetric problem in the use condition of the variable cross-section leaf spring. The present utility model can monitor in real time whether the variable cross-section leaf spring suspension system is used normally through the provided suspension self-checking mechanism. If an abnormality is found, a warning is issued by the vehicle-mounted system to remind timely maintenance, improving the use functionality of the variable cross-section leaf spring suspension system. Description of the Drawings

[0024] Figure 1 is a schematic three-dimensional structure of a single-point suspension system for trailers using variable cross-section leaf springs proposed by the present utility model Figure I ;

[0025] Figure 2 is a schematic three-dimensional structure of a single-point suspension system for trailers using variable cross-section leaf springs proposed by the present utility model Figure II ;

[0026] Figure 3 is a schematic three-dimensional structure diagram of the suspension self-checking mechanism;

[0027] Figure 4 is a schematic three-dimensional disassembled structure diagram of the suspension self-checking mechanism.

[0028] In the figure: 1. Installation top plate; 2. Installation hole; 3. Connecting column; 4. Triaxial accelerometer; 5. Installation bottom plate; 6. Side frame; 7. Suspension self-check mechanism; 71. Screwed disc; 72. Sleeve; 73. Slide bar; 74. Rotating groove; 75. Roller; 76. Limit bar; 77. Limit groove; 78. Spring; 79. Pressure sensor; 8. First hoop groove; 9. Variable cross-section leaf spring; 10. Hoop; 11. Limit groove; 12. Top seat; 13. Second hoop groove; 14. Axle installation cylinder. Specific implementation manner

[0029] 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 only a part of the embodiments of the present invention, rather than all the embodiments.

[0030] Refer to Figures 1-4 , a single-point suspension system for trailers using a variable cross-section leaf spring, including an installation top plate 1, a connecting column 3 is connected to the bottom of the installation top plate 1, the lower end of the connecting column 3 is fixedly connected to an installation bottom plate 5, a variable cross-section leaf spring 9 is arranged on the lower side of the installation bottom plate 5, side frames 6 are fixedly connected to both sides of the connecting column 3, and a suspension self-check mechanism 7 is installed on the lower side of the side frames 6; the suspension self-check mechanism 7 includes a screwed disc 71, a sleeve 72 is fixedly installed at the bottom of the screwed disc 71, a slide bar 73 is slidably installed inside the sleeve 72, a rotating groove 74 is fixedly installed at the bottom of the slide bar 73, a roller 75 is rotatably installed inside the rotating groove 74, a spring 78 is fixedly installed at the end of the slide bar 73, a pressure sensor 79 is fixedly connected to the end of the spring 78, the pressure sensor 79 is fixedly installed inside the sleeve 72, a triaxial accelerometer 4 is fixedly installed on the side wall of the connecting column 3, and both the pressure sensor 79 and the triaxial accelerometer 4 are connected to the vehicle control system.

[0031] In this embodiment, installation holes 2 are provided on the installation top plate 1. The triaxial accelerometer 4 can detect bumpy sections during vehicle driving. When encountering a bumpy section, the vehicle control system senses it. At this time, the data monitoring of the feedback from the suspension self-check mechanism 7 is cancelled to avoid misjudgment. When encountering a bumpy section, the deformation amounts at both ends of the variable cross-section leaf spring 9 must differ greatly. At this time, the data feedback from the suspension self-check mechanism 7 is not referenceable. Therefore, the setting of the triaxial accelerometer 4 improves the accuracy of the detection of the suspension self-check mechanism 7.

[0032] With the above structure, the installation holes 2 provided on the installation top plate 1 facilitate the screwed installation of the installation top plate 1 on the bottom of the vehicle chassis.

[0033] In this embodiment, a first hoop groove 8 is screwed and installed at the bottom of the mounting base plate 5. The first hoop groove 8 is sleeved outside the variable cross-section leaf spring 9. Hoops 10 are symmetrically sleeved on the variable cross-section leaf spring 9. A limiting groove 11 is fixedly connected to the outer side end of the variable cross-section leaf spring 9. A top seat 12 is arranged above the limiting groove 11. A second hoop groove 13 is screwed and installed on the lower side of the top seat 12. A vehicle axle mounting cylinder 14 is fixedly connected to the bottom of the second hoop groove 13.

[0034] Through the above structure, the first hoop groove 8 provides a mounting and supporting point for the variable cross-section leaf spring 9 at the bottom of the mounting base plate 5, and the screwed overall structure of the second hoop groove 13 and the top seat 12 provides a connection point for the vehicle axle mounting cylinder 14 at the end of the variable cross-section leaf spring 9.

[0035] In this embodiment, a screwed disk 71 is screwed and installed at the bottom of the side frame 6.

[0036] Through the above structure, the entire suspension self-check mechanism 7 can be disassembled from the bottom of the side frame 6, facilitating subsequent maintenance work.

[0037] In this embodiment, the roller 75 is made of rubber.

[0038] Through the above structure, the rubber material setting ensures that when the roller 75 contacts the upper side of the variable cross-section leaf spring 9, it will not cause scratches on the upper side of the variable cross-section leaf spring 9.

[0039] In this embodiment, a limiting strip 76 is fixedly connected to the inner part of the sleeve 72. A limiting groove 77 is correspondingly arranged on the side wall of the sliding rod 73. The limiting strip 76 is in sliding contact with the inner side wall of the limiting groove 77.

[0040] Through the above mechanism, the cooperation setting of the limiting strip 76 and the limiting groove 77 restricts the rotational freedom of the sliding rod 73 inside the sleeve 72.

[0041] In the present utility model, during use, since the lower side of the variable cross-section leaf spring 9 supports two vehicle axles and provides a supporting force, the variable cross-section leaf spring 9 will be forced to bend upward. When the variable cross-section leaf spring 9 bends, its upper side will push the roller 75 to slide upward. Further, the roller 75 will push the upper sliding rod 73 to slide inward into the sleeve 72. Consequently, the spring 78 will undergo a contraction deformation, generating a pressure on the pressure sensor 79 at the upper end of the spring 78. If the pressure values of the pressure sensors 79 located inside the two sleeves 72 on both sides differ significantly, it indicates that the use condition of the variable cross-section leaf spring 9 has an eccentric asymmetry problem. This is a problem with the use condition of the variable cross-section leaf spring 9, and a warning is issued by the vehicle system to remind timely repair to avoid affecting its service life and shock absorption effect under this use condition.

[0042] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic features of the present utility model, the present utility model can be implemented in other specific forms. Therefore, in whatever aspect, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes within the meaning and scope of the equivalent elements of the claims in the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0043] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A trailer single-point suspension system using a variable-section leaf spring, characterized in that: It comprises a mounting top plate (1), the bottom of the mounting top plate (1) is connected to a connecting column (3), the lower end of the connecting column (3) is fixedly connected to a mounting bottom plate (5), a variable-section leaf spring (9) is arranged on the lower side of the mounting bottom plate (5), both sides of the connecting column (3) are fixedly connected to side frames (6), and a suspension self-checking mechanism (7) is installed on the lower side of the side frame (6); The suspension self-test mechanism (7) comprises a screw-on disk (71), a sleeve (72) is fixedly mounted on the bottom of the screw-on disk (71), a slide bar (73) is slidably mounted on the inner side of the sleeve (72), a rotating groove (74) is fixedly mounted on the bottom of the slide bar (73), a roller (75) is rotatably mounted on the inner side of the rotating groove (74), a spring (78) is fixedly mounted on the end of the slide bar (73), a pressure sensor (79) is fixedly connected to the end of the spring (78), and the pressure sensor (79) is fixedly mounted inside the sleeve (72), and a triaxial accelerometer (4) is fixedly mounted on the side wall of the connecting column (3).

2. The trailer single-point suspension system using a variable-section leaf spring according to claim 1, characterized in that: The pressure sensor (79) and the three-axis accelerometer (4) are both connected to the vehicle control system.

3. The trailer single-point suspension system using a variable-section leaf spring according to claim 1, characterized in that: The mounting top plate (1) is provided with a mounting hole (2).

4. The trailer single-point suspension system using a variable-section leaf spring according to claim 1, characterized in that: A first clamping groove (8) is screwed and installed at the bottom of the installation base plate (5), and the first clamping groove (8) is sleeved on the outside of the variable-section leaf spring (9).

5. The trailer single-point suspension system using a variable-section leaf spring according to claim 1, characterized in that: A clamp (10) is symmetrically sleeved on the variable-section leaf spring (9).

6. The trailer single-point suspension system using a variable-section leaf spring according to claim 1, characterized in that: A limiting groove (11) is fixedly connected to the outer end of the variable-section leaf spring (9), a top seat (12) is provided on the upper side of the limiting groove (11), and a second clamp groove (13) is screwed and installed on the lower side of the top seat (12).

7. The trailer single-point suspension system using a variable-section leaf spring according to claim 6, characterized in that: An axle mounting cylinder (14) is fixedly connected to the bottom of the second clamping groove (13).

8. The trailer single-point suspension system using a variable-section leaf spring according to claim 1, characterized in that: The screw connection plate (71) is screwed and installed on the bottom of the side frame (6).

9. The trailer single-point suspension system using a variable-section leaf spring according to claim 1, characterized in that: The roller (75) is made of rubber.

10. The trailer single-point suspension system using a variable-section leaf spring according to claim 1, characterized in that: A limiting strip (76) is fixedly connected to the interior of the sleeve (72), and a limiting groove (77) is correspondingly arranged on the side wall of the sliding rod (73), and the limiting strip (76) is in sliding contact with the inner side wall of the limiting groove (77).

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