A forklift steering column assembly

Abstract

The present invention discloses a forklift steering column assembly, including an upper column tube, a lower column tube, an upper steering shaft, a lower steering shaft, an upper mounting bracket, a lower mounting bracket and a heat dissipation mechanism, wherein the heat dissipation mechanism includes a liquid storage box, a cooling pipe and a drainage component. The heat dissipation mechanism in the present application effectively reduces the temperature of the steering system under high-intensity working conditions, prevents failures caused by overheating, and ensures the stability of the equipment during long-term operation. In addition, the circulation of the coolant not only improves the heat dissipation efficiency, but also reduces the consumption of the coolant, reduces maintenance costs, and further extends the service life of the forklift. Through the design of the drainage component, the coolant can flow rapidly, ensuring timely heat dissipation of the steering system, and improving the adaptability and work efficiency of the forklift under various working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of forklift steering systems, and in particular to a forklift steering column assembly. Background Art

[0002] When the forklift is turning, the driver applies the steering torque through the steering wheel to make the steering wheel rotate. This process is the key to the forklift operation. The steering torque is first transmitted to the steering gear through the steering shaft. The steering gear accurately measures the pressure oil diverted by the diverter valve according to the angle of the steering wheel rotation and transmits it to the steering cylinder through the pipeline. The function of the steering cylinder is to convert hydraulic energy into mechanical energy, and then drive the steering wheel through the steering body to achieve precise steering operation.

[0003] However, since forklifts need to frequently perform steering operations during operation, this high frequency of use often causes the temperature of the steering column to rise significantly. The increase in the temperature of the steering column not only aggravates its wear, but may also have an adverse effect on the safety of the entire steering system. The service life of the steering column will be greatly affected by long-term high temperature and high load conditions, which may lead to equipment failure or performance degradation, thereby increasing the cost of repair and replacement. Therefore, temperature management, lubrication and cooling measures for the forklift steering column are particularly important to ensure the safe and stable operation of the forklift in a high-intensity operating environment.

[0004] A Chinese invention patent (publication number CN108639145A) discloses a high-temperature resistant forklift steering column assembly, including a first sleeve, the outer wall of the heat sink is provided with a plurality of straight tubes and bent tubes for heat conduction, a third sleeve is provided outside the first sleeve, a second fixing block is placed on the inner wall of the third sleeve, and the third sleeve is fixedly connected to the heat dissipation pipe through the second fixing block, and a plurality of perforations for water spraying are equidistantly provided on the outer side of the heat dissipation pipe.

[0005] The above-mentioned prior art can absorb the heat generated by the second sleeve during rotational friction through the heat sink, and can absorb the heat from the heat sink through the straight pipe and the curved pipe, thereby reducing the temperature inside the first sleeve and protecting the first sleeve. The water flow entering the heat dissipation pipe can form a water curtain, which can not only absorb the heat inside the third sleeve, but also effectively improve the heat insulation capacity of the third sleeve. In the design of the column assembly, three water pumps need to be configured to effectively guide the water flow. These three water pumps will cool down the three sleeves respectively to ensure that the appropriate temperature is maintained during operation, thereby improving the stability and service life of the equipment. In addition, considering that the operation and regulation of the water pump require precise control, a special line system must be set up to control the start and stop of the water pump and the regulation of the water flow. This series of designs not only improves the overall performance of the system, but also requires additional equipment and complex line layout, resulting in relatively high project costs. Summary of the invention

[0006] In view of the problems of the prior art, a forklift steering column assembly is provided. By arranging a drainage component in the lower column tube and a liquid storage box on the outside, when the lower steering shaft rotates, the drainage component can stably and continuously pump the coolant in the liquid storage box into the cooling pipes installed on the upper column tube and the lower column tube, thereby cooling the steering column and solving the problem of high cost of the existing rotating columns that can be cooled.

[0007] In order to solve the problems of the prior art, the present invention provides a forklift steering column assembly, comprising an upper column tube, a lower column tube coaxially interference fit with the upper column tube, an upper steering shaft coaxially arranged in the upper column tube, and a lower steering shaft coaxially arranged in the lower column tube, the upper steering shaft and the lower steering shaft are transmission-connected at opposite ends, an upper mounting bracket is arranged on the upper column tube, a lower mounting bracket is arranged on the lower column tube, and a heat dissipation mechanism is also included, the heat dissipation mechanism comprises a liquid storage box, a cooling pipe and a drainage component, the liquid storage box is arranged on the upper column The outer sides of the upper column tube and the lower column tube are provided with a liquid inlet and a liquid outlet on the liquid storage box; cooling pipes are provided in the upper column tube and the lower column tube, and one end of the cooling pipe is connected with the liquid inlet; the drainage component is arranged in the lower column tube and is drivingly connected with the lower steering shaft, the drainage component has a pump flow port and a drainage port, the pump flow port is connected with the liquid outlet, and the drainage port is connected with the other end of the cooling pipe. When the lower steering shaft rotates, the coolant in the liquid storage box passes through the liquid outlet, the pump flow port, the drainage port, the cooling pipe and the liquid inlet in sequence and flows back to the liquid storage box.

[0008] Preferably, the heat dissipation mechanism also includes a hose, the cooling pipe is spiral, the top port of the cooling pipe is connected to the liquid inlet of the liquid storage box through the hose, and the bottom port of the cooling pipe is connected to the drainage port of the drainage assembly.

[0009] Preferably, the drainage assembly includes a liquid supply chamber coaxially surrounding the lower steering shaft, a piston ring that slides longitudinally to change the volume of the liquid supply chamber, and a guide column arranged on the circumferential surface of the lower steering shaft, the guide column extends radially along the lower steering shaft, the inner circumferential surface of the piston ring is provided with V-shaped grooves distributed along its circumference, the top ends of adjacent V-shaped grooves are connected to each other, the outer end of the guide column extends into the V-shaped groove and slides therewith, when the lower steering shaft rotates, the guide column guides the piston ring to move longitudinally, the pump flow port and the drainage port are both connected to the liquid supply chamber, the external port of the pump flow port is provided with a liquid inlet one-way valve connected to the liquid outlet of the liquid storage box, the external port of the drainage port is provided with a liquid outlet one-way valve connected to the cooling pipe, and the piston ring guides the coolant in the liquid storage box into the cooling pipe when it is raised and lowered longitudinally.

[0010] Preferably, the drainage assembly also includes a sealing cylinder coaxially arranged in the lower column tube, the inner diameter of the sealing cylinder is larger than the diameter of the lower steering shaft, the sealing cylinder has an annular sliding cavity coaxial therewith, the piston ring is coaxially slidingly arranged in the annular sliding cavity, and an annular sliding groove coaxial therewith is also arranged on the inner circumferential surface of the sealing cylinder, the guide column rotates in the annular sliding groove, and a liquid supply cavity is formed between the end of the piston ring and the end of the annular sliding cavity.

[0011] Preferably, an upper annular chamber is formed between the top end of the piston ring and the top end of the annular sliding chamber, and a lower annular chamber is formed between the bottom end of the piston ring and the bottom end of the annular sliding chamber, and both the upper annular chamber and the lower annular chamber are provided with pump flow ports and drainage ports.

[0012] Preferably, the inner wall of the annular sliding cavity is provided with a guide column extending in its radial direction, and the outer circumferential surface of the piston ring is provided with a guide groove extending in its axial direction, and the guide column extends into the guide groove and slides in cooperation with the guide column.

[0013] Preferably, the inner circumferential surface of the piston ring is provided with a cylindrical groove coaxial with it, an upper positioning ring coaxial with it is provided on the inner side of the top end of the annular groove, and a lower positioning ring coaxial with it is provided on the inner side of the bottom end of the annular groove, both the upper positioning ring and the lower positioning ring extend into the cylindrical groove, an upper elastic element is provided between the upper positioning ring and the top end of the cylindrical groove, and a lower elastic element is provided between the lower positioning ring and the bottom end of the cylindrical groove.

[0014] Preferably, the drainage assembly also includes a buffer ring coaxially arranged in the lower column tube, the inner diameter of the buffer ring is larger than the diameter of the lower steering shaft, the buffer ring has a buffer cavity coaxial therewith, the buffer cavity is provided with a fluid filling port and a fluid discharge port, the fluid discharge port is connected with the port of the cooling pipe, the fluid filling port is connected with the fluid outlet one-way valve, and the coolant pumped out by the piston ring passes through the buffer cavity and enters the cooling pipe.

[0015] Preferably, the sealing cylinder includes an upper cylinder and a lower cylinder, the upper cylinder and the lower cylinder are hollow and open at opposite ends, the bottom end of the outer circumferential surface of the upper cylinder is provided with an internal threaded cylinder coaxial therewith, and the top end of the outer circumferential surface of the lower cylinder is provided with an external threaded cylinder coaxial therewith, and the internal threaded cylinder and the external threaded cylinder are coaxially threadedly screwed together.

[0016] Preferably, one side of the liquid storage box is provided with cooling fins arranged along its length direction, a heat exchange channel is formed between adjacent cooling fins, and a fan is provided at one end of the cooling fin to guide cooling air to pass through the heat exchange channel.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The heat dissipation mechanism in this application effectively reduces the temperature of the steering system under high-intensity working conditions, prevents failures caused by overheating, and ensures the stability of the equipment during long-term operation. In addition, the circulation of the coolant not only improves the heat dissipation efficiency, but also reduces the consumption of coolant, reduces maintenance costs, and further extends the service life of the forklift. Through the design of the drainage component, the coolant can flow quickly, ensuring timely heat dissipation of the steering system, and improving the adaptability and work efficiency of the forklift under various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The invention is a stereoscopic diagram of a forklift steering column assembly.

[0020] Figure 2 The present invention is a three-dimensional cross-sectional view of a forklift steering column assembly.

[0021] Figure 3 The present invention is a cross-sectional view of a forklift steering column assembly.

[0022] Figure 4 yes Figure 3 A partial enlarged view of point A.

[0023] Figure 5 yes Figure 3 A partial enlarged view of point B.

[0024] Figure 6 The present invention is a stereoscopic diagram of a drainage component in a forklift steering column assembly.

[0025] Figure 7 The utility model is a partial three-dimensional exploded view of a drainage component in a forklift steering column assembly.

[0026] Figure 8 The invention is a three-dimensional exploded view of a drainage component in a forklift steering column assembly.

[0027] Fig. 9 It is a stereoscopic view of a piston ring in a forklift steering column assembly from a first viewing angle.

[0028] Fig.10 It is a stereoscopic image of a piston ring in a forklift steering column assembly from a second viewing angle.

[0029] The numbers in the figure are: 1, upper column tube; 11, upper mounting bracket; 2, lower column tube; 21, lower mounting bracket; 3, upper steering shaft; 4, lower steering shaft; 51, liquid storage box; 511, liquid inlet; 512, liquid outlet; 513, cooling fin; 514, fan; 52, cooling tube; 53, drainage assembly; 531, pump flow port; 532, drainage port; 533, sealing cylinder; 5331, liquid supply chamber; 5333, annular slide groove; 5334, upper positioning ring; 5335, lower positioning ring; 5341. guide column; 5342. upper elastic element; 5343. lower elastic element; 5344. upper cylinder; 5345. internal thread cylinder; 5346. lower cylinder; 5347. external thread cylinder; 535. piston ring; 5351. V-shaped groove; 5352. guide groove; 5353. cylindrical groove; 536. guide column; 537. liquid inlet check valve; 538. liquid outlet check valve; 539. buffer ring; 5391. buffer chamber; 5392. liquid filling port; 5393. liquid discharge port. DETAILED DESCRIPTION

[0030] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, this application provides:

[0032] A forklift steering column assembly includes an upper column tube 1, a lower column tube 2 coaxially interference fit with the upper column tube 1, an upper steering shaft 3 coaxially arranged in the upper column tube 1, and a lower steering shaft 4 coaxially arranged in the lower column tube 2, the upper steering shaft 3 and the lower steering shaft 4 are transmission-connected at opposite ends, an upper mounting bracket 11 is arranged on the upper column tube 1, a lower mounting bracket 21 is arranged on the lower column tube 2, and a heat dissipation mechanism is also included, the heat dissipation mechanism includes a liquid storage box 51, a cooling pipe 52 and a drainage component 53, the liquid storage box 51 is arranged on the outer sides of the upper column tube 1 and the lower column tube 2, and a liquid inlet 511 is arranged on the liquid storage box 51 and a liquid outlet 512; a cooling pipe 52 is provided in the upper column tube 1 and the lower column tube 2, one end of the cooling pipe 52 is connected to the liquid inlet 511; the drainage component 53 is arranged in the lower column tube 2 and is transmission-connected to the lower steering shaft 4, the drainage component 53 has a pump flow port 531 and a drainage port 532, the pump flow port 531 is connected to the liquid outlet 512, and the drainage port 532 is connected to the other end of the cooling pipe 52. When the lower steering shaft 4 rotates, the coolant in the liquid storage box 51 passes through the liquid outlet 512, the pump flow port 531, the drainage port 532, the cooling pipe 52 and the liquid inlet 511 in sequence and flows back to the liquid storage box 51.

[0033] A forklift steering column assembly includes multiple key components to ensure its efficient operation. Among them, the upper column tube 1 and the lower column tube 2 with coaxial interference fit constitute an integral bracket. In the upper column tube 1, an upper steering shaft 3 is coaxially arranged, and in the lower column tube 2, a lower steering shaft 4 is arranged. The opposite ends of the two are connected by a transmission device. Such a design ensures the flexibility and stability of the steering system. In addition, the external mounting bracket of the upper column tube 1 and the lower mounting bracket 21 of the lower column tube 2 provide support and fixation for the entire structure, further enhancing its stability. In order to improve the heat dissipation efficiency of the forklift during operation, the assembly is also equipped with a heat dissipation mechanism. The heat dissipation mechanism is mainly composed of a liquid storage box 51, a cooling pipe 52 and a drainage component 53. The liquid storage box 51 is placed on the outside of the upper column tube 1 and the lower column tube 2, and is provided with a liquid inlet 511 and a liquid outlet 512 to facilitate the flow of the coolant. The cooling pipe 52 runs through the upper column tube 1 and the lower column tube 2, and one end of the cooling pipe is connected to the liquid inlet 511 to realize the circulation of the coolant. The drainage component 53 is installed inside the lower column tube 2 and is connected to the lower steering shaft 4 in a transmission manner, so that the drainage component 53 can effectively guide the flow of the coolant when working. The drainage component 53 is designed with a pump flow port 531 and a drainage port 532, wherein the pump flow port 531 is connected to the liquid outlet 512 to ensure that the coolant is circulated in the liquid storage box 51, and the drainage port 532 is connected to the other end of the cooling pipe 52. When the lower steering shaft 4 rotates, the coolant in the liquid storage box 51 passes through the liquid outlet 512, the pump flow port 531, the drainage port 532, the cooling pipe 52 and the liquid inlet 511 in sequence, forming a complete cycle, and finally flows back to the liquid storage box 51, thereby ensuring that the entire steering column assembly can still maintain good heat dissipation performance under high-load working conditions, extending its service life and improving work efficiency.

[0034] like Figure 2 As shown, the heat dissipation mechanism also includes a hose, and the cooling tube 52 is coaxially arranged in the upper column tube 1 and the lower column tube 2 in a spiral shape. The top port of the cooling tube 52 is connected to the liquid inlet 511 of the liquid storage box 51 through the hose, and the bottom port of the cooling tube 52 is connected to the drainage port 532 of the drainage assembly 53.

[0035] The cooling tube 52 is coaxially arranged in the upper column tube 1 and the lower column tube 2 in a spiral shape. This spiral structure not only saves space, but also improves the cooling effect. The top port of the cooling tube 52 is connected to the liquid inlet 511 of the liquid storage box 51 through a flexible hose, ensuring that the coolant can flow smoothly into the cooling tube 52, providing necessary heat dissipation support for the steering system. The spiral layout increases the contact area between the coolant and the tube wall, thereby improving the efficiency of heat exchange and ensuring that the coolant can effectively take away the excess heat generated by the steering system during the flow process.

[0036] At the same time, the bottom port of the cooling pipe 52 is connected to the drainage port 532 of the drainage component 53. This direct connection ensures the rapid reflux of the coolant, making the cooling process more efficient. When the lower steering shaft 4 rotates, the coolant forms a good circulation in the cooling pipe 52, and continuously absorbs the heat generated by the steering shaft and its surrounding components during the flow process, thereby reducing the overall temperature. This design not only improves the heat dissipation efficiency of the system, but also reduces the risk of equipment failure caused by overheating, and enhances the operational stability of the forklift.

[0037] In addition, the layout of the spiral cooling pipe 52 also helps to reduce the residence time of the coolant in the pipe, ensuring that the coolant can circulate quickly, thereby maintaining the efficient operation of the cooling system. Overall, the setting of the cooling pipe 52 optimizes the heat dissipation performance of the forklift steering system, improves the adaptability of the forklift in various working environments, thereby improving the working efficiency and the service life of the equipment, so that the forklift can still maintain excellent performance during high-load operation.

[0038] like Figure 4 , Figure 5 , Fig. 9 and Fig.10 As shown, the drainage assembly 53 includes a liquid supply chamber 5331 coaxially surrounding the lower steering shaft 4, a piston ring 535 that slides in the longitudinal direction to change the volume of the liquid supply chamber 5331, and a guide column 536 arranged on the circumferential surface of the lower steering shaft 4, the guide column 536 extends in the radial direction of the lower steering shaft 4, and the inner circumferential surface of the piston ring 535 is provided with V-shaped grooves 5351 distributed along the circumference thereof, the top ends of adjacent V-shaped grooves 5351 are connected to each other, and the outer end of the guide column 536 extends into the V-shaped groove 5351 and In sliding cooperation with it, when the lower steering shaft 4 rotates, the guide column 536 guides the piston ring 535 to move longitudinally, the pump flow port 531 and the drainage port 532 are both connected to the liquid supply chamber 5331, the external port of the pump flow port 531 is provided with a liquid inlet one-way valve 537 connected to the liquid outlet 512 of the liquid storage box 51, and the external port of the drainage port 532 is provided with a liquid outlet one-way valve 538 connected to the cooling pipe 52. When the piston ring 535 rises and falls longitudinally, it guides the coolant in the liquid storage box 51 into the cooling pipe 52.

[0039] Because the guide column 536 is slidably matched with the continuous V-shaped groove 5351, and the piston ring 535 slides in the longitudinal direction, that is, when the lower steering shaft 4 rotates, the guide column 536 will rotate along the circumference of the lower steering shaft 4, which will cause the piston ring 535 to rise and fall back and forth in the longitudinal direction, thereby causing the pressure in the liquid supply chamber 5331 to change back and forth. When the pressure in the liquid supply chamber 5331 increases, the coolant in the liquid supply chamber 5331 will enter the cooling pipe 52 through the liquid outlet one-way valve 538 to enable the coolant to flow in the cooling pipe 52; when the pressure in the liquid supply chamber 5331 decreases, the coolant in the liquid storage box 51 will enter the liquid supply chamber 5331 through the liquid inlet one-way valve 537 to enable the coolant in the liquid supply chamber 5331 to be replenished.

[0040] like Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, the drainage assembly 53 also includes a sealing cylinder 533 coaxially arranged in the lower column tube 2, the inner diameter of the sealing cylinder 533 is larger than the diameter of the lower steering shaft 4, the sealing cylinder 533 has an annular sliding cavity coaxial therewith, the piston ring 535 is coaxially slidingly arranged in the annular sliding cavity, and an annular groove 5333 coaxial therewith is also arranged on the inner circumferential surface of the sealing cylinder 533, the guide column 536 rotates in the annular groove 5333, and a liquid supply cavity 5331 is formed between the end of the piston ring 535 and the end of the annular sliding cavity.

[0041] The structure of the drainage assembly 53 is more complex and sophisticated, and also includes a sealing cylinder 533 coaxially arranged in the lower column tube 2. The inner diameter of the sealing cylinder 533 is larger than the diameter of the lower steering shaft 4, forming an effective closed space, avoiding leakage of the coolant, and ensuring stability under high pressure and high temperature conditions. At the same time, the sealing cylinder 533 is provided with an annular sliding cavity coaxial therewith, so that the piston ring 535 can slide freely therein.

[0042] The piston ring 535 is coaxially slidably arranged in the annular sliding cavity, and this design enables the piston ring 535 to move smoothly and unhindered during operation. The inner circumferential surface of the sealing cylinder 533 is also provided with an annular groove 5333 coaxial therewith, and the existence of these annular grooves 5333 enables the guide column 536 to rotate therein, ensuring the coordinated movement between the piston ring 535 and the guide column 536.

[0043] A liquid supply chamber 5331 is formed between the end of the piston ring 535 and the end of the annular sliding chamber, and the liquid supply chamber 5331 serves as a storage and distribution area for the coolant during operation. Due to the design of the annular sliding chamber, the coolant can flow quickly between the liquid supply chamber 5331 and the cooling tube 52. When the piston ring 535 moves in the longitudinal direction, the volume change of the liquid supply chamber 5331 causes the coolant to be pushed into the cooling tube 52, thereby achieving an efficient heat dissipation effect.

[0044] like Figure 4 As shown, an upper annular chamber is formed between the top end of the piston ring 535 and the top end of the annular sliding chamber, and a lower annular chamber is formed between the bottom end of the piston ring 535 and the bottom end of the annular sliding chamber. A pump flow port 531 and a drainage port 532 are provided on the upper annular chamber and the lower annular chamber.

[0045] An upper annular chamber is formed between the top of the piston ring 535 and the top of the annular sliding chamber. The design of this chamber not only provides additional space for the distribution of the coolant, but also enhances the sealing and stability of the overall structure; and a lower annular chamber is formed between the bottom of the piston ring 535 and the bottom of the annular sliding chamber, which also plays the role of storing and regulating the flow of the coolant. The design of the upper annular chamber and the lower annular chamber enables the piston ring 535 to effectively control the flow direction of the coolant during operation, ensuring the response speed and flexibility of the cooling system under different working conditions, so that when the piston ring 535 moves upward or downward, coolant always enters the cooling pipe 52. The upper annular chamber and the lower annular chamber are both provided with a pump flow port 531 and a drainage port 532. The configuration of these pump flow ports 531 and the drainage port 532 enables the coolant to flow rapidly between the upper annular chamber and the lower annular chamber, thereby achieving more efficient heat exchange. Through the pump flow port 531, the coolant is forcibly delivered to the components that need heat dissipation, and the drainage port 532 ensures that the excess coolant can flow back to the liquid storage box 51 or other circulation systems in time, thereby forming a closed-loop flow mechanism. This design effectively reduces the temperature of the system, improves the heat dissipation efficiency, and ensures that the forklift can still maintain a good working condition during high-load operation, avoiding performance degradation or failure due to overheating. At the same time, the structural design of the chamber also simplifies the maintenance and overhaul of the system, improves the overall reliability, and further extends the service life of the equipment.

[0046] like Figure 4 and Figure 8 As shown, the inner wall of the annular sliding cavity is provided with a guide column 5341 extending along its radial direction, and the outer circumferential surface of the piston ring 535 is provided with a guide groove 5352 extending along its axial direction. The guide column 5341 extends into the guide groove 5352 and slides with it.

[0047] The outer circumferential surface of the piston ring 535 is also provided with a guide groove 5352 extending along its axial direction. The design of the guide groove 5352 enables the piston ring 535 to obtain a better guiding effect when moving. When the piston ring 535 moves in the annular sliding cavity, the guide column 5341 extends into the guide groove 5352 and slides with it, thereby ensuring the smooth operation of the piston ring 535 under various working conditions. The cooperation between the guide column 5341 and the guide groove 5352 can effectively prevent the piston ring 535 from tilting or getting stuck, thereby improving the working efficiency of the entire drainage assembly 53.

[0048] like Figure 4 As shown, the inner circumferential surface of the piston ring 535 is provided with a cylindrical groove 5353 coaxial therewith, an upper positioning ring 5334 coaxial therewith is provided on the inner side of the top end of the annular groove 5333, and a lower positioning ring 5335 coaxial therewith is provided on the inner side of the bottom end of the annular groove 5333. Both the upper positioning ring 5334 and the lower positioning ring 5335 extend into the cylindrical groove 5353, an upper elastic element 5342 is provided between the upper positioning ring 5334 and the top end of the cylindrical groove 5353, and a lower elastic element 5343 is provided between the lower positioning ring 5335 and the bottom end of the cylindrical groove 5353.

[0049] An upper positioning ring 5334 coaxial with the annular groove 5333 is provided inside the top end thereof, and the upper positioning ring 5334 can effectively limit the upward position of the piston ring 535 during operation, thereby preventing the piston ring 535 from unexpectedly moving during high-frequency movement, thereby ensuring the safety and reliability of the system; and a lower positioning ring 5335 coaxial with the annular groove 5333 is provided inside the bottom end thereof, and the lower positioning ring 5335 also plays a role in limiting the downward movement of the piston ring 535, thereby ensuring the smooth operation of the piston ring 535 in the annular groove 5333. Both the upper positioning ring 5334 and the lower positioning ring 5335 extend into the cylindrical groove 5353, and this design effectively enhances the guiding effect of the piston ring 535 during movement. In order to further improve the dynamic performance of the system, an upper elastic element 5342 is arranged between the upper positioning ring 5334 and the top end of the cylindrical groove 5353, and a lower elastic element 5343 is arranged between the lower positioning ring 5335 and the bottom end of the cylindrical groove 5353. The configuration of the upper elastic element 5342 and the lower elastic element 5343 enables the piston ring 535 to absorb and buffer the impact force applied by the outside during movement, thereby reducing the vibration and noise of the system.

[0050] like Figure 5 As shown, the drainage assembly 53 also includes a buffer ring 539 coaxially arranged in the lower column tube 2, the inner diameter of the buffer ring 539 is larger than the diameter of the lower steering shaft 4, the buffer ring 539 has a buffer cavity 5391 coaxial therewith, and the buffer cavity 5391 is provided with a liquid replenishing port 5392 and a liquid draining port 5393, the liquid draining port 5393 is connected with the port of the cooling pipe 52, the liquid replenishing port 5392 is connected with the liquid outlet one-way valve 538, and the coolant pumped out by the piston ring 535 passes through the buffer cavity 5391 and enters the cooling pipe 52.

[0051] The drainage assembly 53 also includes a buffer ring 539 coaxially arranged in the lower column tube 2. The inner diameter of the buffer ring 539 is designed to be larger than the diameter of the lower steering shaft 4. This design ensures that the lower steering column can rotate unimpeded in the lower column tube 2. The buffer ring 539 has a coaxial buffer cavity 5391 inside. The design of the buffer cavity 5391 allows the flow state of the coolant to be effectively adjusted during the working process, thereby improving the cooling efficiency. The buffer cavity 5391 is provided with a refill port 5392 and a drain port 5393. The setting of the refill port 5392 allows the coolant to be replenished in time when the coolant is insufficient, ensuring that the cooling system is always in the best working state, while the drain port 5393 is connected to the port of the cooling pipe 52, so that the coolant can be quickly discharged and the system overheating problem caused by the retention of the coolant can be prevented. In addition, the connection between the refill port 5392 and the liquid outlet check valve 538 ensures that the replenished coolant will not flow back, maintaining the efficiency and stability of the system. The coolant pumped out by the piston ring 535 will smoothly enter the cooling pipe 52 after passing through the buffer chamber 5391. This process not only ensures the stability of the coolant during the flow, but also effectively reduces the impact force that may be generated during the flow, so that the cooling system can maintain a good heat dissipation effect when working under high load.

[0052] like Figure 8 As shown, the sealing cylinder 533 includes an upper cylinder 5344 and a lower cylinder 5346. The upper cylinder 5344 and the lower cylinder 5346 are hollow and open at opposite ends. The bottom end of the outer circumference of the upper cylinder 5344 is provided with an internal threaded cylinder 5345 coaxial therewith, and the top end of the outer circumference of the lower cylinder 5346 is provided with an external threaded cylinder 5347 coaxial therewith. The internal threaded cylinder 5345 and the external threaded cylinder 5347 are coaxially threadedly screwed together.

[0053] The sealing cylinder 533 comprises an upper cylinder 5344 and a lower cylinder 5346, wherein the upper cylinder 5344 and the lower cylinder 5346 are both hollow structures and open at opposite ends, and this design enables the sealing cylinder 533 to effectively accommodate internal fluids during operation, thereby achieving a good sealing effect. The bottom end of the outer circumference of the upper cylinder 5344 is provided with an internal threaded cylinder 5345 coaxial therewith, and the design of this internal thread not only enhances the structural strength of the upper cylinder 5344, but also provides an interface that is convenient for connection with other components. Meanwhile, the top end of the outer circumference of the lower cylinder 5346 is also provided with an external threaded cylinder 5347 coaxial therewith, and such an external thread design enables the lower cylinder 5346 to be tightly combined with the upper cylinder 5344 through a threaded connection, thereby ensuring the sealing and stability of the entire system. The internal threaded cylinder 5345 and the external threaded cylinder 5347 are screwed together by coaxial threads, so that the upper cylinder 5344 and the lower cylinder 5346 can be firmly connected together to form a complete sealing structure to prevent leakage of the internal fluid. This threaded connection is not only easy to assemble and disassemble, but also can be conveniently operated when maintenance and repair are required, ensuring the flexibility and convenience of the use of the sealing cylinder 533.

[0054] like Figure 2 and Figure 3 As shown, one side of the liquid storage box 51 is provided with cooling fins 513 arranged along its length direction, and a heat exchange channel is formed between adjacent cooling fins 513. A fan 514 is provided at one end of the cooling fins 513, and the fan 514 guides cooling air to pass through the heat exchange channel.

[0055] One side of the liquid storage box 51 is provided with cooling fins 513 arranged along its length direction. The design of these cooling fins 513 is intended to improve the heat dissipation efficiency of the liquid and ensure that the liquid in the liquid storage box 51 is maintained at a suitable temperature under various working conditions. A heat exchange channel is formed between adjacent cooling fins 513, which provides a good path for the heat conduction of the liquid. A fan 514 is provided at one end of the cooling fins 513. The fan 514 guides the cooling wind to pass through the heat exchange channel so that the airflow passing through the cooling fins 513 can quickly take away the heat of the liquid, thereby further reducing the temperature of the liquid inside the liquid storage box 51. Driven by the fan 514, the cooling wind flows at a high speed along the heat exchange channel to form a stable airflow, ensuring that the liquid is fully in contact with the cooling fins 513 during the flow process, optimizing the efficiency of heat exchange, and ensuring that the temperature of the coolant pumped into the cooling tube 52 is lower than the temperature in the upper column tube 1 and the lower column tube 2.

[0056] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the protection scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A forklift steering column assembly, comprising an upper column tube (1), a lower column tube (2) coaxially interference fit with the upper column tube (1), an upper steering shaft (3) coaxially arranged in the upper column tube (1), and a lower steering shaft (4) coaxially arranged in the lower column tube (2), the upper steering shaft (3) and the lower steering shaft (4) being transmission-connected at opposite ends, an upper mounting bracket (11) being arranged on the upper column tube (1), and a lower mounting bracket (21) being arranged on the lower column tube (2), characterized in that: The heat dissipation device also comprises a heat dissipation mechanism, which comprises a liquid storage box (51), a cooling pipe (52) and a drainage assembly (53); the liquid storage box (51) is arranged on the outside of the upper column tube (1) and the lower column tube (2); the liquid storage box (51) is provided with a liquid inlet (511) and a liquid outlet (512); the cooling pipe (52) is provided in both the upper column tube (1) and the lower column tube (2); one end of the cooling pipe (52) is communicated with the liquid inlet (511); the drainage assembly (53) is arranged in the lower column tube (2) and is connected to the lower column tube (2); The steering shaft (4) is drivingly connected, and the drainage component (53) comprises a pump flow port (531) and a drainage port (532), the pump flow port (531) is in communication with the liquid outlet (512), and the drainage port (532) is in communication with the other end of the cooling pipe (52), and when the lower steering shaft (4) rotates, the coolant in the liquid storage box (51) passes through the liquid outlet (512), the pump flow port (531), the drainage port (532), the cooling pipe (52) and the liquid inlet (511) in sequence and flows back into the liquid storage box (51).

2. A forklift steering column assembly according to claim 1, characterized in that: The heat dissipation mechanism also includes a hose. The cooling tube (52) is spirally shaped. The top port of the cooling tube (52) is connected to the liquid inlet (511) of the liquid storage box (51) through the hose. The bottom port of the cooling tube (52) is connected to the drainage port (532) of the drainage assembly (53).

3. A forklift steering column assembly according to claim 1, characterized in that: The drainage assembly (53) comprises a liquid supply chamber (5331) coaxially surrounding the lower steering shaft (4), a piston ring (535) sliding in the longitudinal direction to change the volume of the liquid supply chamber (5331), and a guide column (536) arranged on the circumferential surface of the lower steering shaft (4), wherein the guide column (536) extends in the radial direction of the lower steering shaft (4), and the inner circumferential surface of the piston ring (535) is provided with V-shaped grooves (5351) distributed along the circumference thereof, the top ends of adjacent V-shaped grooves (5351) are connected to each other, and the outer end of the guide column (536) extends into the V-shaped groove (5351) and slides therewith. When the lower steering shaft (4) rotates, the guide column (536) guides the piston ring (535) to move in the longitudinal direction, the pump flow port (531) and the drainage port (532) are both connected to the liquid supply chamber (5331), the external port of the pump flow port (531) is provided with a liquid inlet check valve (537) connected to the liquid outlet (512) of the liquid storage box (51), and the external port of the drainage port (532) is provided with a liquid outlet check valve (538) connected to the cooling pipe (52), and the piston ring (535) guides the coolant in the liquid storage box (51) to enter the cooling pipe (52) when it is lifted or lowered in the longitudinal direction.

4. A forklift steering column assembly according to claim 3, characterized in that: The drainage assembly (53) further comprises a sealing cylinder (533) coaxially arranged in the lower column tube (2), the inner diameter of the sealing cylinder (533) being larger than the diameter of the lower steering shaft (4), the sealing cylinder (533) having an annular sliding cavity coaxial therewith, the piston ring (535) being coaxially slidingly arranged in the annular sliding cavity, the inner circumferential surface of the sealing cylinder (533) also being provided with an annular sliding groove (5333) coaxial therewith, the guide column (536) rotating in the annular sliding groove (5333), and a liquid supply cavity (5331) being formed between the end of the piston ring (535) and the end of the annular sliding cavity.

5. A forklift steering column assembly according to claim 4, characterized in that: An upper annular chamber is formed between the top end of the piston ring (535) and the top end of the annular sliding chamber, and a lower annular chamber is formed between the bottom end of the piston ring (535) and the bottom end of the annular sliding chamber. A pump flow port (531) and a drainage port (532) are provided on both the upper annular chamber and the lower annular chamber.

6. A forklift steering column assembly according to claim 4, characterized in that: The inner circumferential wall of the annular sliding cavity is provided with a guide column (5341) extending in its radial direction, and the outer circumferential surface of the piston ring (535) is provided with a guide groove (5352) extending in its axial direction. The guide column (5341) extends into the guide groove (5352) and slides in cooperation with the guide column.

7. A forklift steering column assembly according to any one of claims 4 to 6, characterized in that: The inner circumferential surface of the piston ring (535) is provided with a cylindrical groove (5353) coaxial with the piston ring (535), an upper positioning ring (5334) coaxial with the piston ring (5353) is provided on the inner side of the top end of the annular groove (5333), and a lower positioning ring (5335) coaxial with the piston ring (5353) is provided on the inner side of the bottom end of the annular groove (5333). Both the upper positioning ring (5334) and the lower positioning ring (5335) extend into the cylindrical groove (5353), an upper elastic element (5342) is provided between the upper positioning ring (5334) and the top end of the cylindrical groove (5353), and a lower elastic element (5343) is provided between the lower positioning ring (5335) and the bottom end of the cylindrical groove (5353).

8. A forklift steering column assembly according to any one of claims 4 to 6, characterized in that: The drainage assembly (53) further comprises a buffer ring (539) coaxially arranged in the lower column tube (2); the inner diameter of the buffer ring (539) is larger than the diameter of the lower steering shaft (4); the buffer ring (539) has a buffer cavity (5391) coaxially arranged therewith; the buffer cavity (5391) is provided with a liquid replenishment port (5392) and a liquid discharge port (5393); the liquid discharge port (5393) is communicated with a port of the cooling tube (52); the liquid replenishment port (5392) is communicated with a liquid outlet one-way valve (538); and the coolant pumped out by the piston ring (535) passes through the buffer cavity (5391) and enters the cooling tube (52).

9. A forklift steering column assembly according to claim 4, characterized in that: The sealing cylinder (533) comprises an upper cylinder (5344) and a lower cylinder (5346); the upper cylinder (5344) and the lower cylinder (5346) are hollow and open at opposite ends; an internally threaded cylinder (5345) coaxial with the upper cylinder (5344) is provided at the bottom end of the outer circumferential surface; an externally threaded cylinder (5347) coaxial with the lower cylinder (5346) is provided at the top end of the outer circumferential surface; the internally threaded cylinder (5345) and the externally threaded cylinder (5347) are coaxially threadedly screwed together.

10. A forklift steering column assembly according to any one of claims 1-6 and 9, characterized in that: One side of the liquid storage box (51) is provided with cooling fins (513) arranged along its length direction, a heat exchange channel is formed between adjacent cooling fins (513), and a fan (514) is provided at one end of the cooling fins (513), and the fan (514) guides cooling air to pass through the heat exchange channel.

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