Height adjustable saddle for a semi-trailer

Abstract

The utility model relates to a height adjustable's semitrailer saddle type tow seat, including bottom plate, the upper surface symmetry of bottom plate is installed with support, is installed with tow seat board through the pin shaft on support, tow seat board bottom both sides are fixedly installed with lug plate, is equipped with at least two hinged holes along the height direction on lug plate, be equipped with the lifting drive cylinder between bottom plate and tow seat board lower bottom surface, the cylinder seat fixed mounting of lifting drive cylinder is in tow seat board or bottom plate, the other end is hinged with opposite bottom plate or tow seat board. The utility model overturns traditional lifting principle, proposes a lug plate - pin shaft direct lifting mechanism, and realizes the zero deviation control of goods barycenter under the air bag suspension leveling working condition in combination with the precise cooperation of stepped mechanical positioning and guide strip.

Description

Technical Field

[0001] This utility model belongs to the technical field of saddle-type traction connectors, and particularly relates to a height-adjustable saddle-type traction seat for semi-trailers. Background Technology

[0002] With the development of efficient logistics and transportation, semi-trailer air suspension systems are widely used in fields such as precision instrument transportation and cold chain logistics due to their advantage of quickly adjusting the cargo platform height. However, when the trailer uses air suspension while the tractor unit uses traditional leaf spring suspension, adjusting the trailer air suspension height will cause a height difference between the connecting planes of the tractor unit and the trailer.

[0003] This height difference will cause two major safety hazards:

[0004] 1. Cargo center of gravity shift: The cargo's center of gravity shifts forward / backward, increasing the load on the front axle and increasing the risk of tire blowout;

[0005] 2. Traction torque imbalance: The trailer tilting generates additional torque, which can cause the main vehicle to wheelie under extreme conditions.

[0006] While existing lifting tow seats (such as the semi-trailer tow seat disclosed in CN216886966U) can achieve height adjustment, their rocker-platform lifting structure has inherent defects:

[0007] - Response lag: The multi-stage transmission mechanism cannot match the real-time leveling requirements of the airbag suspension;

[0008] - Insufficient load-bearing rigidity: Relying on wedge blocks for auxiliary support when in place, the structure is prone to loosening under heavy load vibration conditions;

[0009] Therefore, there is an urgent need to develop a height-adjustable saddle-type towing seat for semi-trailers with rapid rigid positioning capabilities to fundamentally solve the driving safety problems caused by air suspension leveling. Utility Model Content

[0010] To address the problems existing in the prior art, this utility model provides a height-adjustable saddle-type towing seat for semi-trailers. This utility model revolutionizes the traditional lifting principle by proposing a direct lifting mechanism using an ear plate and pin shaft. Combined with stepped mechanical positioning and precise coordination with guide strips, it achieves zero-deviation control of the cargo's center of gravity under airbag suspension leveling conditions.

[0011] This utility model is implemented as follows: a height-adjustable saddle-type towing seat for semi-trailers includes a base plate, supports symmetrically mounted on the upper surface of the base plate, a towing seat plate mounted on the supports via pins, ear plates fixedly provided on both sides of the bottom of the towing seat plate, and at least two hinge holes provided on the ear plates along the height direction; a lifting drive cylinder is provided between the base plate and the lower surface of the towing seat plate, the cylinder seat of the lifting drive cylinder is fixedly mounted on the towing seat plate or the base plate, and the other end is hinged to the opposite base plate or towing seat plate.

[0012] More preferably, the inner side of the ear plate is provided with two parallel guide strips, and the distance between the two guide strips is equal to the outer diameter of the portion of the pin extending out of the ear plate.

[0013] More preferably, the lifting drive cylinder is a hydraulic cylinder or a pneumatic cylinder.

[0014] More preferably, the guide strip is rigidly connected to the inner side of the ear plate.

[0015] More preferably, the end inlet of the hinge hole is provided with a guide chamfer.

[0016] More preferably, the number of hinge holes on the ear plate is 2 to 4, and they are evenly distributed along the vertical direction.

[0017] The advantages and technical effects of this utility model are as follows: This utility model achieves rapid and precise height adjustment of the saddle-type towing seat of a semi-trailer through an innovative stepped mechanical positioning structure and a rigid direct-drive lifting system. Its core effects are reflected in three main aspects:

[0018] Safety and control measures: When the height of the trailer air suspension changes, the lifting drive cylinder raises the traction seat plate, causing the pin to quickly switch to the corresponding height of the hinge hole, eliminating the height difference between the main trailer and the connecting plane in real time, and fundamentally avoiding the risk of tire blowout or wheelie caused by the offset of the cargo's center of gravity.

[0019] Operational reliability: The parallel guide bars on the inner side of the ear plate form a vertical guide channel with a precise spacing (equal to the outer diameter of the pin), ensuring that the pin does not move horizontally during height adjustment: completely solving the problem of pin insertion and removal jamming in traditional lifting mechanisms; significantly reducing the wear and tear of the pin under heavy load vibration conditions.

[0020] Structural efficiency optimization: The lifting drive cylinder is directly hinged between the traction seat plate and the base plate (1), forming the shortest force transmission path: compared with the rocker-type lifting structure, the stiffness is increased by about 40% (based on the material mechanics model calculation); the stepped hinge hole provides mechanical hard limit, eliminating the energy consumption burden of continuous pressure holding of the hydraulic / pneumatic system. Attached Figure Description

[0021] Figure 1 This is a top view of the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 3 yes Figure 1 Sectional view of AA;

[0024] Figure 4 This is a schematic diagram of the traction seat plate structure.

[0025] 1. Base plate; 2. Support; 3. Pin; 4. Traction seat plate; 5. Ear plate; 6. Hinge hole; 7. Lifting drive cylinder; 8. Guide bar. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0027] Please see Figures 1 to 4 A height-adjustable saddle-type towing seat for a semi-trailer includes a base plate 1. Supports 2 are symmetrically mounted on the upper surface of the base plate 1. A towing seat plate 4 is mounted on the support 2 via a pin 3. Ear plates 5 are fixedly provided on both sides of the bottom of the towing seat plate 4. At least two hinge holes 6 are provided on the ear plates 5 along the height direction. A lifting drive cylinder 7 is provided between the base plate 1 and the lower surface of the towing seat plate 4. The cylinder seat of the lifting drive cylinder 7 is fixedly mounted on the towing seat plate 4 or the base plate 1, and the other end is hinged to the opposite base plate 1 or the towing seat plate 4.

[0028] This utility model features a height-adjustable saddle-type towing seat for semi-trailers. Through the stepped engagement of the ear plate 5 and the hinge hole 6, the rigid height of the towing seat plate 4 is adjusted, eliminating the elastic deformation error of traditional transmission chains and ensuring that the cargo platform and the main vehicle plane remain coplanar. The lifting drive cylinder 7 directly lifts the towing seat plate 4, avoiding structural loosening caused by platform transmission, improving the response speed and positioning accuracy of height adjustment, and reducing the risk of cargo center of gravity shift.

[0029] Preferably, the inner side of the ear plate 5 is provided with two parallel guide strips 8, the distance between the two guide strips 8 being equal to the outer diameter of the portion of the pin 3 extending out of the ear plate 5. The guide strips 8, through precise spacing, limit the vertical movement trajectory of the pin 3, preventing radial displacement of the pin 3 during insertion and removal, and ensuring the coaxiality of the pin 3 and the hinge hole 6. This structure reduces wear on the pin 3 and the hinge hole 6, extends the service life of the pin 3, and avoids jamming caused by pin 3 misalignment, thus improving operational reliability.

[0030] Preferably, the lifting drive cylinder 7 is a hydraulic cylinder or a pneumatic cylinder. Hydraulic cylinders or pneumatic cylinders can match the leveling requirements of air suspension, providing stable and adjustable driving force. Hydraulic cylinders are suitable for heavy-duty conditions, while pneumatic cylinders have the advantage of being lightweight. Users can choose the drive method according to their actual needs, balancing efficiency and cost.

[0031] Preferably, the guide strip 8 is rigidly connected to the inner side of the ear plate 5; the rigid connection structure between the guide strip 8 and the ear plate 5 can withstand lateral impact forces, preventing the guide strip 8 from loosening and causing increased gaps under heavy load vibration conditions. This design ensures the movement stability of the pin 3 under complex road conditions and avoids structural failure caused by the failure of the guide strip 8.

[0032] More preferably, the end inlet of the hinge hole 6 is provided with a guide chamfer, preferably 45°; the guide chamfer can reduce the frictional resistance when the pin 3 is inserted into the hinge hole 6, and improve the smoothness of the insertion and removal operation. The chamfer design avoids hard collision between the end of the pin 3 and the edge of the hinge hole 6, reduces stress concentration, and extends the service life of the ear plate 5.

[0033] Preferably, the number of hinge holes 6 on the ear plate 5 is 2 to 4, and they are evenly distributed along the vertical direction; the design of multiple hinge holes 6 provides multiple height adjustment functions, which can accurately match the preset height of the airbag suspension. The evenly distributed arrangement ensures that the mechanical properties of each position are consistent, avoids structural failure caused by local stress concentration, and improves the overall fatigue resistance of the traction seat.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A height-adjustable saddle-type towing seat for a semi-trailer, comprising a base plate (1), wherein supports (2) are symmetrically mounted on the upper surface of the base plate (1), and a towing seat plate (4) is mounted on the supports (2) via pins (3), characterized in that: The traction seat plate (4) has ear plates (5) fixed on both sides of its bottom, and the ear plates (5) have at least two hinge holes (6) along the height direction; A lifting drive cylinder (7) is provided between the bottom surface of the base plate (1) and the bottom surface of the traction seat plate (4). The cylinder seat of the lifting drive cylinder (7) is fixedly installed on the traction seat plate (4) or the base plate (1), and the other end is hinged to the opposite base plate (1) or traction seat plate (4).

2. The height-adjustable semi-trailer saddle-type towing seat according to claim 1, characterized in that: The inner side of the ear plate (5) is provided with two parallel guide strips (8), and the distance between the two guide strips (8) is equal to the outer diameter of the part of the pin (3) extending out of the ear plate (5).

3. The height-adjustable semi-trailer saddle-type towing seat according to claim 1, characterized in that: The lifting drive cylinder (7) is a hydraulic cylinder or a pneumatic cylinder.

4. The height-adjustable semi-trailer saddle-type towing seat according to claim 1, characterized in that: The guide bar (8) is rigidly connected to the inside of the ear plate (5).

5. The height-adjustable semi-trailer saddle-type towing seat according to claim 1, characterized in that: The hinge hole (6) has a guide chamfer at its end entrance.

6. The height-adjustable semi-trailer saddle-type towing seat according to claim 1, characterized in that: The number of hinge holes (6) on the ear plate (5) is 2-4, and they are evenly distributed along the vertical direction.

Images