Electric power-assisted steering bridge based on electric forklift truck

Abstract

This invention relates to an electric power steering axle for use in electric forklifts, belonging to the field of electric power steering axle technology. It includes a load-bearing shaft, a lower housing mounted on the load-bearing shaft, an upper housing and a power steering motor mounted on the lower housing, and the upper and lower housings being internally connected. The lower and upper housings transmit the driving force of the power steering motor, which provides power assistance to the lower housing. A power steering assembly is provided on the upper housing. Through the design of the power steering assembly, when adding lubricating medium, the lubricating medium is actively sprayed through gas propulsion to the areas where each transmission component is located, improving the sufficiency and uniformity of the lubricating medium distribution. This reduces the risk of localized dry friction caused by inadequate manual lubrication. Furthermore, a positive pressure environment is maintained inside the housing during lubrication, which facilitates the rapid penetration of the lubricating medium into the mating positions of each transmission structure, improving the contact efficiency between the lubricating medium and the friction surfaces.

Description

Technical Field

[0001] This invention relates to the field of electric power steering axle technology, specifically to an electric power steering axle used in electric forklifts. Background Technology

[0002] The electric power steering axle of an electric forklift refers to a forklift steering axle assembly that integrates a power steering motor and a reduction gear transmission mechanism. The power steering motor transmits driving force to the load-bearing shaft through multiple transmission mechanisms inside the lower and upper housings, thereby providing electric power assistance for steering operations. This reduces the steering burden on the driver and improves the forklift's maneuverability and operating efficiency in confined spaces. Simultaneously, the various transmission components inside the steering axle require lubrication to reduce wear and tear, ensuring the long-term reliable operation of the steering axle.

[0003] However, existing electric power steering axles used in electric forklifts still have shortcomings in practical use. On the one hand, after long-term operation, the lubricating medium inside the steering axle housing inevitably deteriorates and becomes contaminated, requiring regular and thorough replacement. However, the existing structure requires manual operation for both draining and filling, requiring users to crawl under the vehicle to remove and install the drain bolts, resulting in limited working space and inconvenience. Furthermore, industrial lubricating media have high viscosity and poor fluidity, which can easily create negative pressure inside the housing during draining, further hindering oil discharge. This leads to lengthy draining and filling times, cumbersome maintenance procedures, significantly reduced maintenance efficiency, and increased operating costs. In addition, during operation, the power steering motor and internal transmission mechanism continuously generate a large amount of heat, while existing steering axle cooling structures mostly rely on natural heat dissipation or simple independent fans, resulting in limited heat dissipation efficiency. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of inconvenient oil injection and drainage operations, uneven lubrication coverage, and insufficient heat dissipation efficiency in the maintenance of existing steering axles. To achieve the above objective, this invention adopts the following technical solution: an electric power steering axle for use in electric forklifts, including a load-bearing shaft, a lower housing mounted on the load-bearing shaft, an upper housing and a power assist motor mounted on the lower housing, the upper housing and the lower housing being internally connected, the lower housing and the upper housing being used to transmit the driving force of the power assist motor, the power assist motor being used to provide power assist to the lower housing, a power assist component being provided on the upper housing, the power assist component including a drip ring disposed in the upper housing, the drip ring being used to inject lubricating oil into the lower housing and the upper housing, a discharge pipe one being fixedly connected to the bottom of the upper housing, a discharge pipe two being fixedly connected to the bottom of the lower housing, the discharge pipe one and the discharge pipe two being connected, a plug being snapped into the bottom of the discharge pipe one, the plug being used to control the conduction between the lower housing, the upper housing and the outside;

[0005] The lower housing, upper housing, and assist motor are all fitted with an air guide shell. The air guide shell is a hollow sandwich structure with air grooves on its inner surface. The air guide shell is used to provide shielding and protection for the lower housing, upper housing, and assist motor, while the air grooves are used to provide air cooling for the lower housing, upper housing, and assist motor.

[0006] Furthermore, the assistive component also includes a support base, which is fixedly connected to the upper housing. An injection tube is fixedly connected to the support base, and a conduit is fixedly connected to the bottom end of the injection tube. The conduit passes through the upper housing and is fixedly connected to the drip ring. Multiple leakage holes are opened on the bottom surface of the drip ring. A carrier plate is fixedly connected to the top of the injection tube, and a sliding plate is slidably connected to the carrier plate. A bracket is fixedly connected to the bottom of the carrier plate, and a servo motor is fixedly connected to the bracket. The output shaft end of the servo motor faces upward and is fixedly connected to a gear, which meshes with the sliding plate.

[0007] Furthermore, an air pump is fixedly connected to the top of the moving plate on the side away from the support. Two moving holes are opened on the moving plate, and two fixed holes are opened on the carrier plate. An air guide sleeve is fixedly connected to the air nozzle of the air pump, and an air pipe is fixedly connected to the bottom of the carrier plate. The air pipe is fixedly connected to the air guide shell.

[0008] Furthermore, two guide frames are symmetrically fixedly connected to the outer wall of the discharge pipe, and a sealing plate is slidably connected to both guide frames. The sealing plate is fixedly connected to the plug, and two tension springs are symmetrically hinged to the sealing plate. The top of the tension springs is hinged to the upper box body, and a rubber sleeve is fitted on each of the two tension springs. The two ends of the rubber sleeves are fixedly connected to the two ends of the tension springs, respectively. A carrier rod is fixedly connected to the sealing plate, and a connecting rod is fixedly connected to the moving plate. A pressure rod is fixedly connected to the bottom end of the connecting rod.

[0009] Furthermore, the drip ring is located at the top of each mating component inside the lower and upper housings, while discharge pipe one and discharge pipe two are located at the lowest points inside the upper and lower housings, respectively.

[0010] Furthermore, the bottom of the guide frame is tilted away from the upper housing.

[0011] Furthermore, the air guide sleeve is fixedly connected to the moving plate, and the air guide sleeve covers the two moving holes inside.

[0012] Furthermore, the trachea is connected to two fixed holes.

[0013] Furthermore, the side of the compression bar closest to the load bar is set as an inclined surface, and the inclined surface of the compression bar is pressed into the load bar.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The design of the assistive component automatically opens the drain port and deviates from the path of the waste oil, eliminating the need for manual drilling under the vehicle to remove and install the plug, thus reducing the user's workload. Combined with the positive pressure generated by the air pump, it can smoothly push the highly viscous waste oil out, which helps overcome the obstacles of poor flowability and negative pressure to drain the oil, shortens the draining time, and reduces residue. At the same time, the deviation of the plug from the waste oil path can prevent waste oil from covering the plug surface, reducing subsequent cleaning procedures and lowering the risk of waste oil residue contaminating the new injection medium.

[0016] By designing the assistive components, the lubricating medium is actively delivered to the areas of each transmission component through gas propulsion during lubrication. This improves the sufficiency and uniformity of the lubricating medium distribution, reduces the risk of local dry friction caused by inadequate manual lubrication, and maintains a positive pressure environment inside the tank during the lubrication process. This facilitates the rapid penetration of the lubricating medium into the mating positions of each transmission structure, improving the contact efficiency between the lubricating medium and the friction surfaces.

[0017] Through the design of the power steering components, the gas is diverted through the hollow interlayer of the air guide shell and then sprayed onto the lower housing, upper housing, and power steering motor surface via multiple air slots. This allows the cool air to directly act on the surfaces of the heat-generating parts for forced heat exchange, effectively removing heat accumulated in the housing and motor casing, suppressing the temperature rise trend under continuous high-load conditions, and thus helping to extend the maintenance cycle and overall service life of the steering axle. Simultaneously, by controlling the alignment or misalignment of the shifting and fixing holes, switching between air-cooling and oil-filling / draining modes can be achieved, simplifying the equipment structure and maintenance procedures. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the positions of the bearing shaft and the lower housing of the present invention;

[0019] Figure 2 This is a schematic diagram showing the positions of the upper housing and the discharge pipe of the present invention;

[0020] Figure 3 This is a schematic diagram showing the positions of the upper housing and guide frame of the present invention;

[0021] Figure 4 This is a schematic diagram showing the positions of the tension spring and rubber sleeve of the present invention;

[0022] Figure 5 This is a schematic diagram showing the positions of the carrier plate and the transfer plate of the present invention;

[0023] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle;

[0024] Figure 7 This is a schematic diagram showing the positions of the injection pipe and air pump of the present invention;

[0025] Figure 8 This is a schematic diagram showing the positions of the moving and fixing holes in this invention;

[0026] Figure 9 This is a schematic diagram showing the positions of the discharge pipe 2 and the plug of the present invention;

[0027] Figure 10 This is a schematic diagram showing the positions of the air guide shell and air slot of the present invention.

[0028] In the picture:

[0029] 11. Bearing shaft; 12. Lower housing; 13. Upper housing; 14. Power assist motor;

[0030] 21. Support base; 22. Injection pipe; 23. Guide tube; 24. Drip ring; 25. Leak hole; 26. Carrier plate; 27. Moving plate; 28. Bracket; 29. ​​Servo motor; 210. Gear; 211. Air pump; 212. Moving hole; 213. Fixed hole; 214. Air guide sleeve; 215. Air pipe; 216. Air guide shell; 217. Air groove; 218. Discharge pipe one; 219. Discharge pipe two; 220. Guide frame; 221. Sealing plate; 222. Plug; 223. Tension spring; 224. Rubber sleeve; 225. Carrier rod; 226. Connecting rod; 227. Pressure rod. Detailed Implementation

[0031] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0032] Reference Figures 1 to 10 As shown, an electric power steering axle for use in electric forklifts includes a load-bearing shaft 11, a lower housing 12 mounted on the load-bearing shaft 11, an upper housing 13 and a power steering motor 14 mounted on the lower housing 12, the upper housing 13 and the lower housing 12 being internally connected, the lower housing 12 and the upper housing 13 being used to transmit the driving force of the power steering motor 14, and the power steering motor 14 being used to provide power assistance to the lower housing 12;

[0033] An assisting component is provided on the upper housing 13. The assisting component includes a drip ring 24 disposed inside the upper housing 13. The drip ring 24 is used to inject lubricating oil into the lower housing 12 and the upper housing 13. The bottom of the upper housing 13 is fixedly connected to a discharge pipe 218, and the bottom of the lower housing 12 is fixedly connected to a discharge pipe 219. The discharge pipe 218 and the discharge pipe 219 are connected. A plug 222 is snapped into the bottom of the discharge pipe 218. The plug 222 is used to control the communication between the lower housing 12, the upper housing 13 and the outside.

[0034] The lower housing 12, the upper housing 13, and the assist motor 14 are all fitted with an air guide shell 216. The air guide shell 216 is a hollow sandwich structure, and an air groove 217 is opened on the inner surface of the air guide shell 216. The air guide shell 216 is used to provide shielding and protection for the lower housing 12, the upper housing 13, and the assist motor 14, while the air groove 217 is used to provide air cooling for the lower housing 12, the upper housing 13, and the assist motor 14.

[0035] The assistive component also includes a support base 21, which is fixedly connected to the upper housing 13. An injection tube 22 is fixedly connected to the support base 21. The bottom end of the injection tube 22 is fixedly connected to a conduit 23. The conduit 23 passes through the upper housing 13 and is fixedly connected to a drip ring 24. The bottom surface of the drip ring 24 has multiple leakage holes 25. A carrier plate 26 is fixedly connected to the top of the injection tube 22. A sliding plate 27 is slidably connected to the carrier plate 26. A bracket 28 is fixedly connected to the bottom of the carrier plate 26. A servo motor 29 is fixedly connected to the bracket 28. The output shaft end of the servo motor 29 faces upward and is fixedly connected to a gear 210. The gear 210 meshes with the sliding plate 27.

[0036] An air pump 211 is fixedly connected to the top of the moving plate 27 on the side away from the bracket 28. Two moving holes 212 are opened on the moving plate 27, and two fixed holes 213 are opened on the carrier plate 26. An air guide sleeve 214 is fixedly connected to the air nozzle of the air pump 211, and an air pipe 215 is fixedly connected to the bottom of the carrier plate 26. The air pipe 215 is fixedly connected to the air guide shell 216.

[0037] Two guide frames 220 are symmetrically fixedly connected to the outer wall of the discharge pipe 218. A sealing plate 221 is slidably connected to the two guide frames 220. The sealing plate 221 is fixedly connected to the plug 222. Two tension springs 223 are symmetrically hinged to the sealing plate 221. The top of the tension springs 223 is hinged to the upper box 13. A rubber sleeve 224 is fitted on each of the two tension springs 223. The two ends of the rubber sleeves 224 are fixedly connected to the two ends of the tension springs 223 respectively. A carrier rod 225 is fixedly connected to the sealing plate 221. A connecting rod 226 is fixedly connected to the moving plate 27. A pressure rod 227 is fixedly connected to the bottom end of the connecting rod 226.

[0038] Among them, the bearing shaft 11, lower housing 12, upper housing 13, and power steering motor 14 are all existing known technologies. The lower housing 12 and the upper housing 13, through the cooperation of multiple sets of transmission mechanisms, realize the smooth transmission of the driving force of the power steering motor 14 to the bearing shaft 11, thereby realizing the electric power steering of the steering axle. Further details will not be elaborated here.

[0039] Among them, the drip ring 24 is located on the top of each mating component inside the lower box 12 and the upper box 13.

[0040] Among them, the trachea 215 is connected to both fixed holes 213.

[0041] Among them, discharge pipe 1 218 and discharge pipe 2 219 are located at the lowest points inside the upper box 13 and the lower box 12, respectively.

[0042] Among them, the bottom of the guide frame 220 is inclined to the side away from the upper box 13.

[0043] Among them, the air guide sleeve 214 is fixedly connected to the moving plate 27, and the air guide sleeve 214 covers the two moving holes 212.

[0044] Among them, the trachea 215 is connected to two fixed holes 213.

[0045] Wherein: the side of the pressure bar 227 near the support bar 225 is set as an inclined surface, and the inclined surface of the pressure bar 227 is pressed and engaged with the support bar 225.

[0046] In the initial state, i.e., when the steering axle is in normal operation, the states of the various structures within the power steering assembly are as follows:

[0047] The shift plate 27 is located on the carrier plate 26 at the position where the fixed hole 213 and the shift hole 212 coincide and are connected. The air pump 211 is connected to the air pipe 215 through the air guide sleeve 214. When the air pump 211 runs, it sprays gas into the air guide shell 216 through the air pipe 215. The gas flows in the interlayer of the air guide shell 216 and is sprayed onto various parts of the lower box 12, the upper box 13, and the auxiliary motor 14 through multiple air slots 217 to provide air cooling for the lower box 12, the upper box 13, and the auxiliary motor 14.

[0048] At this time, the inside of the injection pipe 22 is empty, and the plug 222 is inserted into the bottom end of the discharge pipe 218. The plug 222 blocks the discharge pipe 218, and the passage between the lower box 12, the upper box 13 and the outside is blocked. The lower box 12 and the upper box 13 are in a closed state. The sealing plate 221 is located at the top of the guide frame 220. The tension spring 223 has not yet produced elastic deformation, and the pressure rod 227 has not yet come into contact with the carrier rod 225.

[0049] With the use of the steering axle, the lubricating medium in the lower housing 12 and upper housing 13 will deteriorate and become contaminated, requiring complete replacement. At this time, the power steering assembly will operate as follows:

[0050] First, the lubricating medium in the lower housing 12 and the upper housing 13 needs to be discharged. At this time, the servo motor 29 is driven to run, so that the output shaft of the servo motor 29 rotates. The output shaft of the servo motor 29 drives the gear 210 to rotate synchronously. During the rotation, the gear 210 meshes with the moving plate 27, so that the moving plate 27 slides on the carrier plate 26. At this time, the user can control the rotation direction of the output shaft of the servo motor 29 to adjust the sliding direction of the moving plate 27 on the carrier plate 26. At this time, the user controls the moving plate 27 to move towards the bracket 28.

[0051] At this time, the moving plate 27 slides on the carrier plate 26 towards the support 28. While the moving plate 27 is sliding, the two moving holes 212 are misaligned with the fixed hole 213 as the moving plate 27 moves. The air pump 211 moves synchronously with the moving plate 27. At this time, the moving holes 212 gradually move closer to the support 28. When the moving plate 27 moves to the position where the two moving holes 212 coincide with the injection tube 22, the servo motor 29 stops running and fixes the state of the two moving holes 212 aligned with the injection tube 22. At this time, the air pump 211 is connected to the inside of the injection tube 22 through the two moving holes 212.

[0052] During the movement of the shift plate 27, the shift plate 27 drives the connecting rod 226 to move synchronously. The connecting rod 226 drives the pressure rod 227 to move closer to the carrier rod 225. During the movement of the pressure rod 227, the pressure rod 227 presses against the carrier rod 225. Under the guiding action of the inclined surface of the pressure rod 227, the carrier rod 225 is subjected to downward pressure by the pressure rod 227. At this time, the carrier rod 225 drives the sealing plate 221 to move downward, causing the sealing plate 221 to slide downward on the guide frame 220. At this time, the tension spring 223 undergoes elastic deformation. Due to the guide frame 220 The bottom of the device is set at an angle, so the sealing plate 221 moves downward along the inclined guide frame 220. Specifically, the sealing plate 221 first moves vertically downward, causing the plug 222 to be pulled out from the bottom end of the discharge pipe 218, and then moves obliquely downward along the inclined surface of the guide frame 220, thereby causing the plug 222 to move obliquely downward, so that the plug 222 moves to a position directly below the discharge pipe 218, that is, the plug 222 is offset from the discharge path of the lubricating medium at the bottom of the discharge pipe 218, avoiding the discharge waste lubricating medium directly covering the plug 222. During the inclined movement of the plug 222, the top and bottom ends of the tension spring 223 rotate accordingly, thereby avoiding interference with the inclined movement of the plug 222.

[0053] It should be noted that as the plug 222 is pulled out from the bottom of the discharge pipe 218, the bottom of the discharge pipe 218 is no longer sealed, that is, the lower box 12 and the upper box 13 are connected to the outside, and the lubricating medium in the lower box 12 and the upper box 13 can be discharged out through the discharge pipe 218.

[0054] When the two shifting holes 212 are aligned with the injection tube 22, the user drives the air pump 211 to run, causing the air pump 211 to spray air into the two shifting holes 212 simultaneously through the air guide sleeve 214. Since the two shifting holes 212 are connected to the injection tube 22, the air guide sleeve 214 injects gas into the injection tube 22 through the two shifting holes 212. The gas flows into the drip ring 24 through the injection tube 22 and the guide tube 23, and is sprayed out into the upper box 13 through the leak hole 25 in the drip ring 24. Since the lower box 12 and the upper box 13 are connected, the gas will flow into the lower box 12 from the upper box 13. Since the discharge pipe 1 218 and the discharge pipe 2 219 are located at the lowest points inside the upper box 13 and the lower box 12, the lubricating medium in the lower box 12 and the upper box 13 will be discharged downward through the discharge pipe 1 218 under the action of gravity and airflow.

[0055] After the lubricating medium in the lower housing 12 and the upper housing 13 is completely discharged, the user stops the operation of the air pump 211. At this time, the user drives the output shaft of the servo motor 29 to rotate in the opposite direction, so that the moving plate 27 slides on the carrier plate 26 away from the bracket 28. At this time, the moving plate 27 causes the moving hole 212 to be misaligned with the injection tube 22. As the moving plate 27 continues to move, when the moving plate 27 moves to the point where the top of the injection tube 22 is exposed, the user stops the operation of the servo motor 29 and fixes the top of the injection tube 22 in this exposed state.

[0056] As the shift plate 27 moves away from the support 28, the shift plate 27 drives the connecting rod 226 to move synchronously. In turn, the connecting rod 226 drives the pressure rod 227 to move away from the carrier rod 225, so that the pressure rod 227 no longer resists and squeezes the carrier rod 225. Then, under the elastic reset action of the tension spring 223, the tension spring 223 pulls the sealing plate 221 upward, so that the sealing plate 221 slides upward in the guide frame 220. When the sealing plate 221 slides to the top of the guide frame 220, the plug 222 is inserted into the bottom end of the discharge pipe 218, thereby sealing the bottom end of the discharge pipe 218. At this time, the passage for the lubricating medium to be discharged from the lower box 12 and the upper box 13 is sealed.

[0057] Once the top of the injection tube 22 is fully exposed, the user can add lubricating medium into the injection tube 22. The lubricating medium fills the injection tube 22 and, under the action of gravity, flows through the conduit 23 into the drip ring 24. However, due to the high viscosity of the lubricating medium, it is not easy for it to flow. When the lubricating medium fills the injection tube 22, the user drives the servo motor 29 to run. The rotation of the servo motor 29 causes the moving plate 27 to move towards the support 28. That is, the moving plate 27 re-seals the top opening of the injection tube 22. At this time, the user controls the moving plate 27 to move to one of the moving holes 212 near the support 28 and align it with the injection tube 22. The other moving hole 212 does not enter the top area of ​​the injection tube 22. That is, the moving hole 212 on the side away from the support 28 coincides with the carrier plate 26.

[0058] Since only one shifting hole 212 is aligned with the injection tube 22 at this time, the shifting plate 27 has a shorter stroke than the shifting plate 27 required to pull out the plug 222. The pressure rod 227 is in a state where it does not contact the compression rod 225. That is, when only the shifting hole 212 near the bracket 28 is aligned with the injection tube 22, the plug 222 still maintains the insertion relationship with the discharge pipe 218, and the lower box 12 and the upper box 13 are still in a sealed state at the bottom discharge port.

[0059] After completion, the user drives the air pump 211 to run, that is, the air pump 211 sprays air into the two shifting holes 212 simultaneously through the air guide sleeve 214. However, since only one of the two shifting holes 212 is aligned with the injection tube 22 at this time, and the shifting hole 212 on the side away from the support 28 coincides with the carrier plate 26, the air pump 211 is restricted from spraying air into the shifting hole 212. This causes the gas sprayed by the air pump 211 to enter the injection tube 22 through the shifting hole 212 that coincides with the injection tube 22. As the gas enters the injection tube 22, the lubricating medium that is full in the injection tube 22 is pushed by the gas, causing the lubricating medium to enter the drip ring 24 through the conduit 23, and then be sprayed out into the upper box 13 through the drain hole 25 in the drip ring 24. The lubricating medium injected into the upper housing 13 is propelled into the lower housing 12 by the gas, allowing the lubricating medium to circulate and distribute within the lower housing 12 and the upper housing 13, covering the various transmission structures within the lower housing 12 and the upper housing 13. At this point, the replacement of the lubricating medium is completed.

[0060] After the lubricating medium replacement is completed, the user drives the servo motor 29 to rotate its output shaft. This rotation, through the meshing of gear 210 with the transfer plate 27, moves the transfer plate 27 on the carrier plate 26 until the two transfer holes 212 and the two fixed holes 213 are aligned. At this point, the transfer plate 27 moves away from the support 28 and re-seals the top of the injection tube 22. Once the two transfer holes 212 and the two fixed holes 213 are aligned, the user stops the servo motor 29. The operation of the air pump 211 fixes the alignment of the moving hole 212 and the fixed hole 213. At this time, the air pump 211 is running, and the gas ejected by the air pump 211 flows into the air guide shell 216 through the air guide sleeve 214, the moving hole 212, the fixed hole 213, and the air pipe 215. The gas flows in the interlayer of the air guide shell 216, and the gas is sprayed onto various parts of the lower box 12, the upper box 13, and the auxiliary motor 14 through multiple air grooves 217 to provide air cooling for the lower box 12, the upper box 13, and the auxiliary motor 14.

[0061] In summary, the following beneficial effects can be achieved through the design of assistive components:

[0062] With the design of the assist component, the drain port opens automatically and the plug 222 is deviated from the path of the waste oil, eliminating the need for manual drilling under the vehicle to remove and install the plug 222, which helps reduce the labor intensity of the user. In conjunction with the positive pressure formed by the gas injected by the air pump 211, the high viscosity waste oil can be smoothly discharged, which helps to overcome the obstruction of poor fluidity and negative pressure on the oil discharge, shortens the oil discharge time, and reduces residue. At the same time, the plug 222 is deviated from the waste oil path, which can prevent waste oil from covering the surface of the plug 222, reducing subsequent cleaning procedures and reducing the risk of waste oil residue contaminating the new injection medium.

[0063] By designing the assistive components, the lubricating medium is actively delivered to the areas of each transmission component through gas propulsion during lubrication. This improves the sufficiency and uniformity of the lubricating medium distribution, reduces the risk of local dry friction caused by inadequate manual lubrication, and maintains a positive pressure environment inside the tank during the lubrication process. This facilitates the rapid penetration of the lubricating medium into the mating positions of each transmission structure, improving the contact efficiency between the lubricating medium and the friction surfaces.

[0064] Through the design of the power steering components, the gas is diverted through the hollow interlayer of the air guide shell 216 and then sprayed onto the surfaces of the lower housing 12, upper housing 13, and power steering motor 14 via multiple air slots 217. This allows the cool air to directly act on the surfaces of the heat-generating parts for forced heat exchange, which helps to remove the heat accumulated in the housing and motor casing in a timely manner, suppressing the temperature rise trend under continuous high-load conditions, thereby helping to extend the maintenance cycle and overall service life of the steering axle. At the same time, by controlling the alignment or misalignment of the shifting hole 212 and the fixed hole 213, the switching between air-cooling mode and oil draining / filling mode can be realized, which helps to simplify the equipment structure and the required maintenance steps.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An electric power steering axle for use in an electric forklift, comprising a load-bearing shaft (11), a lower housing (12) mounted on the load-bearing shaft (11), an upper housing (13) and a power steering motor (14) mounted on the lower housing (12), the upper housing (13) and the lower housing (12) being internally connected, the lower housing (12) and the upper housing (13) being used to transmit the driving force of the power steering motor (14), the power steering motor (14) being used to provide power assistance to the lower housing (12), characterized in that: An assisting component is provided on the upper box (13). The assisting component includes a drip ring (24) installed in the upper box (13). The drip ring (24) is used to inject lubricating oil into the lower box (12) and the upper box (13). The bottom of the upper box (13) is fixedly connected to a discharge pipe one (218), and the bottom of the lower box (12) is fixedly connected to a discharge pipe two (219). The discharge pipe one (218) and the discharge pipe two (219) are connected. A plug (222) is snapped into the bottom of the discharge pipe one (218). The plug (222) is used to control the communication between the lower box (12), the upper box (13) and the outside. The lower housing (12), the upper housing (13), and the power motor (14) are all fitted with a guide shell (216). The guide shell (216) is a hollow sandwich structure. An air groove (217) is opened on the inner surface of the guide shell (216). The guide shell (216) is used to provide shielding and protection for the lower housing (12), the upper housing (13), and the power motor (14). The air groove (217) is used to provide air cooling for the lower housing (12), the upper housing (13), and the power motor (14).

2. The electric power steering axle for use in electric forklifts according to claim 1, characterized in that: The assisting component also includes a support base (21), which is fixedly connected to the upper housing (13). A filling tube (22) is fixedly connected to the support base (21). A conduit (23) is fixedly connected to the bottom end of the filling tube (22). The conduit (23) passes through the upper housing (13) and is fixedly connected to the drip ring (24). Multiple leakage holes (25) are opened on the bottom surface of the drip ring (24). A carrier plate (26) is fixedly connected to the top of the filling tube (22). A sliding plate (27) is slidably connected to the carrier plate (26). A bracket (28) is fixedly connected to the bottom of the carrier plate (26). A servo motor (29) is fixedly connected to the bracket (28). The output shaft end of the servo motor (29) faces upward and is fixedly connected to a gear (210). The gear (210) meshes with the sliding plate (27).

3. The electric power steering axle for use in electric forklifts according to claim 2, characterized in that: An air pump (211) is fixedly connected to the top of the side of the moving plate (27) away from the bracket (28). Two moving holes (212) are opened on the moving plate (27), and two fixed holes (213) are opened on the carrier plate (26). An air guide sleeve (214) is fixedly connected to the air nozzle of the air pump (211), and an air pipe (215) is fixedly connected to the bottom of the carrier plate (26). The air pipe (215) is fixedly connected to the air guide shell (216).

4. The electric power steering axle for use in electric forklifts according to claim 1, characterized in that: Two guide frames (220) are symmetrically fixedly connected to the outer wall of the discharge pipe (218). A sealing plate (221) is slidably connected to the two guide frames (220). The sealing plate (221) is fixedly connected to the plug (222). Two tension springs (223) are symmetrically hinged to the sealing plate (221). The top of the tension springs (223) is hinged to the upper box (13). A rubber sleeve (224) is fitted on each of the two tension springs (223). The two ends of the rubber sleeves (224) are fixedly connected to the two ends of the tension springs (223). A carrier rod (225) is fixedly connected to the sealing plate (221). A connecting rod (226) is fixedly connected to the moving plate (27). A pressure rod (227) is fixedly connected to the bottom end of the connecting rod (226).

5. The electric power steering axle for use in electric forklifts according to claim 1, characterized in that: The drip ring (24) is located at the top of each mating component in the lower box (12) and upper box (13), and the discharge pipe one (218) and discharge pipe two (219) are located at the lower points inside the upper box (13) and lower box (12), respectively.

6. The electric power steering axle for use in electric forklifts according to claim 4, characterized in that: The bottom of the guide frame (220) is tilted away from the upper housing (13).

7. The electric power steering axle for use in electric forklifts according to claim 3, characterized in that: The air guide sleeve (214) is fixedly connected to the moving plate (27), and the air guide sleeve (214) covers the two moving holes (212).

8. The electric power steering axle for use in electric forklifts according to claim 3, characterized in that: The trachea (215) is connected to two fixed holes (213).

9. An electric power steering axle for use in electric forklifts according to claim 4, characterized in that: The side of the pressure bar (227) near the support bar (225) is set as an inclined surface, and the inclined surface of the pressure bar (227) is pressed into the support bar (225).

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