Auxiliary cylinder for a semitrailer

Abstract

The utility model discloses an auxiliary oil cylinder for semitrailer, including the cylinder body, the surface fixed sleeve joint of cylinder body top has the ferrule, the middle of ferrule surface has seted up the slot, the inside of slot is provided with the ball, the inside joint of ball has the slot, the outside of slot is provided due to the card box, the bottom sleeve joint of ferrule surface has the wide spring, the middle sliding sleeve joint of ferrule surface has the sliding sleeve, the top rotation of card box is connected with the universal ring, the bottom of cylinder body right side is provided with the damping mechanism. This application can be quickly disassembled without special tools, can be quickly replaced when damaged, ensures that the oil cylinder is stably connected, and the double spring system can automatically adapt to different road conditions, provides a basic shock absorption to keep stable on the flat road, immediately intervenes in the second shock absorption to absorb violent impact when encountering bumping, avoids the performance limitation of shock absorption under complex road conditions.

Description

Technical Field

[0001] This utility model belongs to the technical field of semi-trailer parts, and specifically relates to an auxiliary hydraulic cylinder for semi-trailers. Background Technology

[0002] A semi-trailer is a trailer with its axle positioned behind the vehicle's center of gravity and equipped with a coupling device that transmits horizontal and vertical forces to the tractor. Semi-trailers are generally three-axle semi-trailers, and they come in many types, such as 11-meter stake semi-trailers, 13-meter stake semi-trailers, and low-flatbed semi-trailers. They are heavy-duty transportation vehicles connected to the semi-trailer head by a towing pin. The auxiliary hydraulic cylinder of a semi-trailer is the core component of a dump semi-trailer, mainly used to realize the lifting and lowering of the cargo box. Its working principle is to convert hydraulic energy into mechanical energy to drive the lifting and lowering of the cargo box.

[0003] However, the universal joint of the auxiliary cylinder of the traditional semi-trailer adopts a fixed connection structure. Installation and disassembly require special tools and are time-consuming and labor-intensive. When damaged, maintenance personnel must remove multiple fasteners to replace it, which will significantly prolong downtime in emergency situations. At the same time, the single rigid connection structure can maintain basic stability on flat roads, but when encountering bumps, the impact force is directly transmitted to the cylinder body. Long-term severe vibration can easily lead to accelerated aging and oil leakage of seals, loosening or even breakage and falling off of connecting bolts.

[0004] To address the problems mentioned in the background above, an auxiliary hydraulic cylinder for semi-trailers is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide an auxiliary hydraulic cylinder for semi-trailers, which has the advantages of easy disassembly and two-stage shock absorption.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an auxiliary hydraulic cylinder for a semi-trailer, comprising a cylinder body, a retaining sleeve fixedly fitted on the top surface of the cylinder body, a groove being formed in the middle of the surface of the retaining sleeve, a retaining ball being disposed inside the groove, a retaining groove being engaged on the inner side of the retaining ball, a retaining box being disposed outside the retaining groove, a wide spring being fitted on the bottom of the surface of the retaining sleeve, a sliding sleeve being slidably fitted in the middle of the surface of the retaining sleeve, a universal ring being rotatably connected to the top of the retaining box, and a shock-absorbing mechanism being disposed at the bottom of the right side of the cylinder body.

[0007] Using the above technical solution: When the universal joint ring needs to be replaced, pull down the sliding sleeve. The sliding sleeve moves and compresses the wide spring. The wide spring contracts, and the retaining ball, no longer compressed by the sliding sleeve, moves outward. The retaining ball loses its engagement with the retaining groove and is pulled outward to replace the retaining box. Insert the new retaining box into the retaining sleeve, release the sliding sleeve, and the wide spring rebounds, causing the sliding sleeve to move upward. The sliding sleeve compresses the retaining ball, rotating the retaining box so that the retaining groove aligns with the retaining ball. The retaining ball engages with the corresponding retaining groove and is then fixed. Replacement is complete. The universal joint ring is quick to install, remove, and maintain, making it more convenient. No special tools are required for quick installation and removal. It can be quickly replaced when damaged, saving time and manpower. In emergency repairs or replacements, this design can significantly improve efficiency and ensure that vehicles can quickly return to operation.

[0008] The present invention is further configured such that the shock absorption mechanism includes a connecting plate, the connecting plate is bolted to the bottom of the right side of the cylinder, a short spring is bolted to the right side of the connecting plate, a damper is sleeved inside the short spring, a collar is slidably sleeved in the middle of the surface of the damper, and a long spring is sleeved on the right side of the surface of the damper.

[0009] The above technical solution employs a shock-absorbing mechanism. When the semi-trailer travels on a smooth road, the short spring contracts and rebounds to absorb the vibration, causing the collar to move back and forth. When traveling on a bumpy road, the long spring contracts and rebounds to absorb the vibration when the short spring reaches its limit. The damper limits the short spring, long spring, and collar, ensuring a stable connection of the hydraulic cylinder. The dual-spring system automatically adapts to different road conditions. On smooth roads, it provides primary basic shock absorption to maintain stability. When encountering bumps, it immediately intervenes with secondary shock absorption to absorb severe impacts. This avoids the performance limitations of shock absorption under complex road conditions. Furthermore, the synergistic effect of the secondary shock absorption significantly reduces vibration, preventing the risk of cylinder seal failure, loose connections, or even detachment due to long-term vibration. It also extends the service life of the hydraulic cylinder and ensures the reliability of the equipment during transportation.

[0010] The present invention is further provided that an oil filling port is provided at the bottom of the left side of the cylinder body.

[0011] The above technical solution allows for convenient oil changes by including a filler neck.

[0012] The present invention is further configured such that there are twelve slots and twelve balls.

[0013] The above technical solution allows for multi-point fixation by setting up twelve points, thus maintaining stability.

[0014] The present invention is further configured such that a limiting block is fixedly fitted onto the top of the surface of the card sleeve.

[0015] The above technical solution, by setting a limit block, can prevent the sliding sleeve from falling off.

[0016] The present invention is further configured such that a limiting ring is fixedly sleeved on the left side of the damper surface.

[0017] The above technical solution involves setting a limiting ring to limit the movement of the collar and prevent excessive compression of the short spring.

[0018] The present invention is further configured such that a mounting plate is bolted to the right side of the long spring.

[0019] The above technical solution allows for easy installation on a semi-trailer by using a mounting plate.

[0020] The present invention is further configured such that pull blocks are bolted to both sides of the sliding sleeve surface.

[0021] The above technical solution involves a pull block that allows for easy pulling of the sliding sleeve.

[0022] In summary, this utility model has the following beneficial effects:

[0023] 1. This utility model makes quick installation, disassembly, and maintenance more convenient through the universal ring. It can be quickly disassembled and assembled without special tools, and can be quickly replaced when damaged, saving time and manpower. In emergency repairs or replacements, this design can greatly improve efficiency and ensure that vehicles can quickly return to operation.

[0024] 2. This utility model ensures a stable connection of the hydraulic cylinder, while the dual-spring system can automatically adapt to different road conditions. On smooth roads, it provides primary basic shock absorption to maintain stability, and when encountering bumps, it immediately intervenes with secondary shock absorption to absorb severe impacts. This avoids the performance limitations of shock absorption under complex road conditions, and the synergistic effect of the secondary shock absorption significantly reduces vibration, avoiding the risk of sealing failure, loose connection, or even detachment of the hydraulic cylinder due to long-term vibration. At the same time, it extends the service life of the hydraulic cylinder and ensures the reliability of the equipment during transportation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a front sectional view of the overall structure of this utility model;

[0027] Figure 3 This is a utility model Figure 2 An enlarged schematic diagram of the mechanism at point A in the middle;

[0028] Figure 4 This is a utility model Figure 2 Enlarged schematic diagram of the mechanism at point B;

[0029] Figure 5 This is a partial structural front view of this utility model.

[0030] Reference numerals in the attached diagram: 1. Cylinder block; 2. Sleeve; 3. Groove; 4. Slot; 5. Ball bearing; 6. Container; 7. Wide spring; 8. Short spring; 9. Long spring; 10. Sliding sleeve; 11. Universal ring; 12. Connecting plate; 13. Damper; 14. Collar; 15. Filler port; 16. Limit block; 17. Limit ring; 18. Mounting plate; 19. Pull block. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Example 1:

[0033] refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 An auxiliary hydraulic cylinder for a semi-trailer includes a cylinder body 1, a working pressure of 10-16 MPa, and a cylinder diameter of 80-150 mm. A retaining sleeve 2 is fixedly fitted onto the top surface of the cylinder body 1. A groove 3 is formed in the middle of the surface of the retaining sleeve 2. A retaining ball 5 is disposed inside the groove 3. A retaining groove 4 is engaged inside the retaining ball 5. A retaining box 6 is disposed outside the retaining groove 4. A wide spring 7 is fitted onto the bottom surface of the retaining sleeve 2. A sliding sleeve 10 is slidably fitted onto the middle surface of the retaining sleeve 2. A universal ring 11 is rotatably connected to the top of the retaining box 6. A retaining box 6 is disposed on the bottom right side of the cylinder body 1. When the universal joint 11 needs to be replaced due to the shock absorption mechanism, pull down the sliding sleeve 10. The sliding sleeve 10 moves and compresses the wide spring 7. The wide spring 7 retracts, and the retaining ball 5 loses the compression of the sliding sleeve 10 and moves outward. The retaining ball 5 moves and loses its engagement with the retaining groove 4. Pull out the retaining box 6 and replace it with a new retaining box 6. Insert the new retaining box 6 into the retaining sleeve 2 and release the sliding sleeve 10. The wide spring 7 rebounds and drives the sliding sleeve 10 to move upward. The sliding sleeve 10 compresses the retaining ball 5 and rotates the retaining box 6 so that the retaining groove 4 aligns with the retaining ball 5. The retaining ball 5 engages and is fixed with the corresponding retaining groove 4. Replacement is complete.

[0034] refer to Figure 1 , Figure 2 A filler neck 15 is provided at the bottom left side of the cylinder body 1, which makes it easy to change the oil.

[0035] refer to Figure 5 The number of slots 4 and ball 5 is set to twelve. By setting it to twelve, multiple points of fixation can be achieved to maintain stability.

[0036] refer to Figure 1 , Figure 2 , Figure 3 A limiting block 16 is fixedly fitted to the top of the surface of the sleeve 2. By setting the limiting block 16, the sliding sleeve 10 can be prevented from falling off.

[0037] refer to Figure 1 , Figure 2 , Figure 3 Pull blocks 19 are bolted to both sides of the surface of the sliding sleeve 10. By setting the pull blocks 19, the sliding sleeve 10 can be easily pulled.

[0038] Example 2:

[0039] refer to Figure 1 , Figure 2 , Figure 4 An auxiliary hydraulic cylinder for a semi-trailer includes a shock-absorbing mechanism comprising a connecting plate 12 bolted to the bottom right side of the cylinder body 1. A short spring 8 with an elastic modulus of 20-30 N / mm and a free length of 50-80 mm is bolted to the right side of the connecting plate 12. A damper 13 with a damping modulus of 500-800 N·s / m and a stroke of 100-150 mm is sleeved inside the short spring 8. A collar 14 is slidably sleeved in the middle of the surface of the damper 13, and a long spring is sleeved on the right side of the surface of the damper 13. Spring 9 has an elastic modulus of 10-15 N / mm. The elastic modulus of the short spring 8 is greater than that of the long spring 9, with a ratio of 1.5-2:1. The free length is 120-180 mm. When the semi-trailer is traveling on a smooth road, vibrations are generated. The short spring 8 contracts and rebounds to absorb the vibrations, driving the collar 14 to move back and forth. When traveling on a bumpy road, when the short spring 8 contracts to its limit, the long spring 9 contracts and rebounds to absorb the vibrations. The damper 13 limits the short spring 8, the long spring 9 and the collar to ensure a stable connection of the hydraulic cylinder.

[0040] refer to Figure 1 , Figure 2 , Figure 4 A limiting ring 17 is fixedly sleeved on the left side of the surface of the damper 13. By setting the limiting ring 17, the movement of the collar 14 can be limited to prevent excessive compression of the short spring 8.

[0041] refer to Figure 1 , Figure 2 , Figure 4 The right side of the long spring 9 is bolted with a mounting plate 18, which allows for easy installation on a semi-trailer.

[0042] Brief description of the usage process: When the universal ring 11 needs to be replaced, pull down the sliding sleeve 10. The sliding sleeve 10 moves and compresses the wide spring 7. The wide spring 7 contracts, and the retaining ball 5 loses the compression of the sliding sleeve 10 and moves outward. The retaining ball 5 moves and loses its engagement with the retaining groove 4. Pull out the retaining box 6 and replace it with a new retaining box 6. Insert the new retaining box 6 into the retaining sleeve 2 and release the sliding sleeve 10. The wide spring 7 rebounds and drives the sliding sleeve 10 to move upward. The sliding sleeve 10 compresses the retaining ball 5 and rotates the retaining box 6 so that the retaining groove 4 aligns with the retaining ball 5. The retaining ball 5 engages and is fixed with the corresponding retaining groove 4. After replacement, when the semi-trailer is driving on a smooth road, it will generate vibration. The short spring 8 contracts and rebounds to absorb the vibration, driving the retaining ring 14 to move back and forth. When driving on a bumpy road, when the short spring 8 contracts to its limit, the long spring 9 contracts and rebounds to absorb the vibration. The damper 13 limits the short spring 8, the long spring 9 and the retaining ring to ensure a stable connection of the hydraulic cylinder.

[0043] It should be noted that parts have a lifespan and can be replaced during regular maintenance when they no longer meet performance requirements. Deterioration in performance due to prolonged use of parts is not a design defect of this application.

[0044] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. An auxiliary hydraulic cylinder for a semi-trailer, comprising a cylinder body (1), characterized in that: A retainer (2) is fixedly fitted onto the top surface of the cylinder (1). A slot (3) is provided in the middle of the surface of the retainer (2). A retaining ball (5) is provided inside the slot (3). A retaining groove (4) is fitted into the inner side of the retaining ball (5). A retaining box (6) is provided outside the retaining groove (4). A wide spring (7) is fitted onto the bottom of the surface of the retainer (2). A sliding sleeve (10) is slidably fitted onto the middle of the surface of the retainer (2). A universal ring (11) is rotatably connected to the top of the retaining box (6). A shock-absorbing mechanism is provided at the bottom right side of the cylinder (1).

2. An auxiliary hydraulic cylinder for a semi-trailer according to claim 1, characterized in that: The damping mechanism includes a connecting plate (12), which is bolted to the bottom of the right side of the cylinder (1). A short spring (8) is bolted to the right side of the connecting plate (12). A damper (13) is sleeved inside the short spring (8). A collar (14) is slidably sleeved in the middle of the surface of the damper (13). A long spring (9) is sleeved on the right side of the surface of the damper (13).

3. An auxiliary hydraulic cylinder for a semi-trailer according to claim 1, characterized in that: A filler neck (15) is provided at the bottom left side of the cylinder body (1).

4. An auxiliary hydraulic cylinder for a semi-trailer according to claim 1, characterized in that: The number of slots (4) and balls (5) is set to twelve.

5. An auxiliary hydraulic cylinder for a semi-trailer according to claim 1, characterized in that: The top of the surface of the sleeve (2) is fixedly fitted with a limiting block (16).

6. An auxiliary hydraulic cylinder for a semi-trailer according to claim 2, characterized in that: A limit ring (17) is fixedly sleeved on the left side of the surface of the damper (13).

7. An auxiliary hydraulic cylinder for a semi-trailer according to claim 2, characterized in that: A mounting plate (18) is bolted to the right side of the long spring (9).

8. An auxiliary hydraulic cylinder for a semi-trailer according to claim 1, characterized in that: Pull blocks (19) are bolted to both sides of the surface of the sliding sleeve (10).

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