Split type recirculating ball type electric power steering gear

Abstract

The present application relates to the technical field of steering gear, and discloses a split type recirculating ball type electric power steering gear, which comprises an electric power steering assembly, a steering assembly which is detachably arranged at a driving end of the electric power steering assembly and forms a split type arrangement with the electric power steering assembly, and a positioning assembly which is arranged inside the steering assembly and used for coaxially connecting with the driving end of the electric power steering assembly, wherein the electric power steering assembly comprises a worm shaft which is rotatably arranged at one side of a speed reducer, a connecting disc which is fixedly arranged at an end of the worm shaft, a first coordination hole which is formed in the inner side of the connecting disc, and an input shaft which is rotatably arranged at the side of the speed reducer away from the connecting disc. The split type recirculating ball type electric power steering gear can effectively solve the problem that the connection between the worm shaft and the ball screw is not safe enough in the prior art.

Description

Technical Field

[0001] This invention relates to the field of steering technology, and more specifically to a split-type recirculating ball electric power steering system. Background Technology

[0002] A recirculating ball steering gear mainly consists of a screw, nut, steering gear housing, and numerous small steel balls. A split-type recirculating ball electric power steering gear comprises a mechanical transmission module and an electric power assist module. The mechanical transmission module retains the core components of the recirculating ball steering gear (screw, nut, and steel ball circulation channels), reducing transmission resistance through rolling friction. The electric power assist module typically places the motor outside the steering gear housing, transmitting torque to the geared sector shaft via a reduction mechanism. Sensors collect steering wheel angle and vehicle speed signals in real time to achieve dynamic power assist adjustment. The split structure separates the mechanical parts from the electric power assist module, facilitating independent maintenance and upgrades.

[0003] In related technologies, to facilitate high-precision connection between the power steering worm gear shaft and the ball screw and reduce errors generated during electric power steering, for example, patent CN116373985A provides a novel split-type electric recirculating ball steering gear and its assembly method. This device forms a coating layer on the outer surface of the worm gear shaft and forms a coated spline tight fit connection with the ball screw, thus assembling a split-type electric recirculating ball steering gear. The structure is simple and the assembly is convenient. The coating layer can increase the axial sliding force between the worm gear shaft and the ball screw, thereby eliminating abnormal noise during torque transmission and minimizing radial runout and axial positioning errors of the worm gear teeth.

[0004] While the existing technical solutions described above can improve the high-precision docking and installation with the ball screw by applying a coating layer to the end of the worm gear shaft, the coating layer is made of PA11+AL203 material. Although this material has good wear resistance and adhesion, the coating thickness is between 0.1mm and 0.2mm. Applying this coating to the end of the worm gear shaft requires a high level of skill in the coating process, and there is an unpredictable risk of damage to the coating layer during long-term use. This results in certain safety hazards in the use of the split recirculating ball electric power steering system. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a split-type recirculating ball electric power steering system, which can effectively solve the problem of insufficient safety in the connection between the worm gear shaft and the ball screw in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a split-type recirculating ball electric power steering system, comprising:

[0008] Electric power steering components;

[0009] The steering component is detachably mounted on the drive end of the electric power steering component, forming a separate configuration from the electric power steering component.

[0010] The positioning component, located inside the steering component, is used for coaxial connection with the drive end of the electric power steering component;

[0011] The electric power assist assembly includes a worm gear shaft rotatably mounted on one side of the reducer, a connecting plate fixedly mounted at the end of the worm gear shaft, a first matching hole opened on the inner side of the connecting plate, and an input shaft rotatably mounted on the side of the reducer away from the connecting plate.

[0012] The steering assembly includes a detachable mounting housing disposed on the outside of the reducer, and the positioning assembly is disposed in the mounting housing; a sealing shell is fixedly disposed at the bottom of the mounting housing, and a ball screw is disposed inside the sealing shell;

[0013] The positioning component includes a fixed plate fixedly disposed at the end of the ball screw. A protective cover is fixedly disposed on the outside of the fixed plate. A rod is slidably disposed on the inside of the protective cover. Several rods are provided. A first matching block is fixedly disposed on the top of each rod. The first matching block cooperates with a first matching hole. The first matching block is fitted inside the first matching hole under the action of axial elastic force.

[0014] Furthermore, a second positioning block is fixedly provided at the bottom of the insertion rod, and an elastic reset member is fixedly provided at the bottom of the second positioning block. Both the elastic reset member and the second positioning block are located inside the protective cover.

[0015] The top of the protective cover has a second matching hole corresponding to the second matching block, and the protective cover is coaxially rotatably disposed inside the mounting shell.

[0016] Furthermore, it also includes a fixing component, which includes a plurality of fixing rods corresponding to the insertion rod, and the fixing rods are slidably disposed inside the fixing plate;

[0017] The inner side of the fixed plate has a through hole corresponding to the fixed rod. The fixed rod is driven by an external force to slide upward and press and fix the insertion rod.

[0018] Furthermore, a cage frame is coaxially fixed on the side of the fixed plate away from the protective cover, and the cage frame is coaxially fixedly connected to the ball screw via a connecting shaft;

[0019] The fixing component also includes a screw, the screw being threaded inside a ball screw, a bracket being rotatably mounted at one end of the screw, the bracket being slidably mounted inside the cage, and a fixing rod being fixedly mounted on the top of the bracket.

[0020] Furthermore, a connector is fixedly provided at the other end of the screw, a fixing block is fixedly provided on the outside of the connector, and a reinforcing member is threaded on the inside of the fixing block;

[0021] A fixing ring is fixedly installed at one end of the ball screw located outside the sealing shell, and the fixing ring is fixedly installed to the fixing block by a reinforcement component.

[0022] Furthermore, the electric power assist assembly also includes a power assist motor for driving the reducer, the power assist motor has a housing with an internal spiral channel on its outer side, and a heat exchange assembly is fixedly installed on the outer side of the mounting housing;

[0023] The heat exchange component includes a heat sink plate, which is fixedly installed on the outside of the mounting plate. A heat dissipation channel is opened inside the heat sink plate. A circulating liquid supply component is connected to one side of the heat sink plate, and the heat dissipation liquid enters the outer housing of the power motor through the heat dissipation channel from the circulating liquid supply component.

[0024] Furthermore, the circulating liquid supply assembly includes a sealing cylinder fixedly disposed on the outside of the mounting plate, the output end of the sealing cylinder being connected to the heat dissipation channel, and the input end of the sealing cylinder being connected to the outer housing of the booster motor;

[0025] A piston is slidably disposed inside the sealing cylinder, and the piston is driven to slide back and forth by an external force.

[0026] Furthermore, a push-pull rod is fixedly provided on the inner side of the piston, a connecting rod is rotatably provided at the other end of the push-pull rod, and a swing rod is rotatably provided at the other end of the connecting rod.

[0027] Furthermore, a ball sleeve is provided on the outer side of the ball screw, and the ball sleeve is slidably disposed within the sealing shell;

[0028] A toothed plate is fixedly provided on one side of the ball sleeve, and a gear block is meshed with the toothed plate;

[0029] The end of the swing rod away from the connecting rod is fixedly mounted coaxially with the gear block.

[0030] Furthermore, a liquid passage hole is provided on the inner side of the piston parallel to the axial direction, and a conical groove is provided at one end of the liquid passage hole near the liquid inlet pipe;

[0031] A sliding pin is slidably provided inside the liquid passage hole. The sliding pin is close to the axis of the piston and slides in contact with the inner wall of the liquid passage hole. A sealing block is fixedly provided at one end of the sliding pin corresponding to the conical groove, and a limit ring is fixedly provided at the other end of the sliding pin.

[0032] Furthermore, it also includes a cleaning assembly, which includes an electric push rod fixedly mounted to the connecting plate. A support block is fixedly mounted on the drive end of the electric push rod. A fixed shaft is fixedly mounted on the inner side of the support block. A stop is fixedly mounted on the end of the fixed shaft away from the support block. A sleeve is rotatably mounted on the outer side of the fixed shaft. A cleaning brush is fixedly mounted on the outer side of the sleeve. Torsion springs that apply downward torque are mounted on both ends of the sleeve. Limiting plates for limiting the movement of the sleeve are fixedly mounted on the bottom of the support block and the stop.

[0033] The technical solution provided by this invention has the following advantages compared with the prior art:

[0034] (1) The present invention pushes the first matching block to automatically cooperate with the first matching hole on one side of the connecting plate by setting the insertion rod. The first matching hole and the first matching block ensure that the insertion rod and the connecting plate are tightly installed in both the axial and radial directions, so that the worm gear shaft can drive the ball screw to rotate synchronously, ensuring the connection accuracy between the worm gear shaft and the ball screw. Furthermore, the rigid structure connection makes the whole more stable and stronger, while reducing the difficulty of processing and installation.

[0035] (2) The present invention automatically engages the first matching block at the end of the spring-driven insertion rod with the first matching hole, so as to facilitate the docking of the internal worm gear shaft and ball screw after the reducer and mounting housing are positioned and installed. Furthermore, by rotating the steering arm on the outside of the sealing housing, the ball screw can be driven to rotate and adjust the position of the first matching block, so as to move the first matching block to the position aligned with the first matching hole to achieve automatic coaxial docking. The corrected steering arm is used to drive the component to drive the vehicle steering structure to perform steering actions.

[0036] (3) The present invention provides a screw thread inside the ball screw. When the fixed rod is driven by rotating the screw to reinforce the insertion rod, the locking effect of the worm gear shaft on the ball screw can be used to prevent the screw and the ball screw from rotating relative to each other, so as to quickly reinforce the insertion rod. After the insertion rod is reinforced, the position of the steering arm can be corrected and adjusted by driving the reducer through the power motor. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0038] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0039] Figure 2This is a schematic diagram of the structure of an explosion according to an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the structure of the electric power assist component according to an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the positioning component according to an embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the steering component according to an embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the heat sink structure according to an embodiment of the present invention;

[0044] Figure 7 This is a schematic diagram of the piston structure according to an embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram of the cleaning component according to an embodiment of the present invention.

[0046] The labels in the diagram represent:

[0047] 1. Electric power assist assembly; 11. Worm gear shaft; 12. Connecting plate; 13. First matching hole; 14. Reducer; 15. Power assist motor; 16. Input shaft; 17. Connecting plate; 18. Cooling fan;

[0048] 2. Steering assembly; 21. Mounting housing; 22. Sealing housing; 23. Ball screw; 24. Ball sleeve; 25. Gear plate; 26. Gear block; 27. Steering swing arm; 28. Screw hole; 29. ​​Retaining ring; 210. Mounting plate;

[0049] 3. Positioning assembly; 31. Fixing plate; 311. Through hole; 32. Protective cover; 321. Second matching hole; 33. Insert rod; 34. First matching block; 35. Ball bearing; 36. Elastic reset component; 37. Second matching block; 38. Cage frame; 39. Connecting shaft;

[0050] 4. Fixing components; 41. Screw; 42. Bracket; 43. Fixing rod; 44. Connector; 45. Fixing block; 46. Reinforcing parts;

[0051] 5. Heat sink; 51. Liquid outlet pipe; 52. Liquid inlet pipe; 53. Heat sink fins;

[0052] 6. Circulating liquid supply assembly; 61. Sealing cylinder; 62. Return pipe; 63. Piston; 631. Liquid passage hole; 632. Conical groove; 64. Push-pull rod; 65. Connecting rod; 66. Swing rod; 67. Sliding pin; 68. Sealing block; 69. Limiting ring;

[0053] 7. Cleaning assembly; 71. Electric push rod; 72. Support block; 73. Fixed shaft; 74. Stop; 75. Sleeve; 76. Cleaning brush; 77. Torsion spring; 78. Limit plate. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0055] The present invention will be further described below with reference to embodiments.

[0056] Please see Figures 1-8 This invention provides a technical solution: a split-type recirculating ball electric power steering system, comprising an electric power steering component 1, a steering component 2, and a positioning component 3; wherein, the steering component 2 is detachably disposed at the drive end of the electric power steering component 1, forming a split configuration; the positioning component 3 is disposed inside the steering component 2 and is used for coaxial connection with the drive end of the electric power steering component 1; the electric power steering component 1 includes a worm gear shaft 11 rotatably disposed on one side of a reducer 14, a connecting plate 12 fixedly disposed at the end of the worm gear shaft 11, a first matching hole 13 opened on the inner side of the connecting plate 12, and an input shaft 1 rotatably disposed on the side of the reducer 14 away from the connecting plate 12. 6; The steering assembly 2 includes a mounting housing 21 detachably disposed on the outside of the reducer 14. A sealing housing 22 is fixedly disposed at the bottom of the mounting housing 21. A ball screw 23 is rotatably disposed inside the sealing housing 22. A ball sleeve 24 is slidably disposed on the outside of the ball screw 23 via a circulating ball. A gear plate 25 is fixedly disposed parallel to the axial direction on the outside of the ball sleeve 24. A gear block 26 is meshed on the outside of the gear plate 25. A steering rocker arm 27 is fixedly disposed at one end of the gear block 26. The steering rocker arm 27 is rotatably disposed on the outside of the sealing housing 22. The ball screw 23 and the gear block 26 are both rotatably disposed inside the sealing housing 22. The ball sleeve 24 is slidably disposed inside the sealing housing 22.

[0057] A positioning component 3 is provided at one end of the ball screw 23 near the connecting plate 12. The positioning component 3 is located inside the mounting shell 21. The positioning component 3 includes a fixed plate 31 fixedly disposed at the end of the ball screw 23. A protective cover 32 is fixedly disposed on the outside of the fixed plate 31. Insert rods 33 are slidably disposed on the inside of the protective cover 32. The insert rods 33 are arranged in a circular array. A first matching block 34 is fixedly disposed on the top of each insert rod 33. The first matching block 34 cooperates with the first matching hole 13. The first matching block 34 is fitted inside the first matching hole 13 under the action of axial elastic force.

[0058] When connecting the electric power steering assembly 1 and the steering assembly 2, and installing the electric power steering assembly 1 and the steering assembly 2 with bolts, the insert rod 33 located inside the mounting housing 21 pushes the first matching block 34 against the bottom of the connecting plate 12 under the action of elastic force. At this time, by rotating the steering swing arm 27 on the outside of the sealing housing 22, the ball screw 23 can be driven to rotate inside the sealing housing 22 (reversibility of the ball screw pair), so that the ball screw 23 drives the insert rods 33 distributed in a ring array on the top of the protective cover 32 to rotate synchronously. When the first matching block 34 on the top of the insert rod 33 slides into the first matching hole 13, under the action of elastic force... The first matching block 34 is pressed into the first matching hole 13. Under the action of the first matching block 34 and the first matching hole 13, the ball screw 23 and the worm gear shaft 11 are coaxially installed. The first matching block 34 and the first matching hole 13 fit together. When the worm gear shaft 11 drives the connecting plate 12 to rotate, the first matching block 34 and the insert rod 33 can drive the fixed plate 31 to rotate at the same time, so that the fixed plate 31 drives the ball screw 23 to rotate synchronously. This ensures the connection accuracy between the worm gear shaft 11 and the ball screw 23. In addition, the rigid structure connection is more stable and stronger, while reducing the difficulty of processing and installation.

[0059] After the first matching block 34 and the first matching hole 13 are engaged, the ball screw 23 can be driven to rotate by the reducer 14, so that the ball screw 23 drives the steering arm 27 to adjust and reset, so as to make correction when it is connected to the car steering structure later.

[0060] The first matching block 34 is provided with a ball bearing 35 on the side near the connecting plate 12. The bottom of the insertion rod 33 is fixedly provided with a second matching block 37. The bottom of the second matching block 37 is fixedly provided with an elastic reset member 36. The elastic reset member 36 and the second matching block 37 are both located inside the protective cover 32. The top of the protective cover 32 is provided with a second matching hole 321 corresponding to the second matching block 37. The protective cover 32 is coaxially rotatably disposed inside the mounting shell 21.

[0061] To ensure the connection accuracy between the insertion rod 33 and the ball screw 23, when the insertion rod 33 drives the first matching block 34 to align with the first matching hole 13, the insertion rod 33 is pushed upward by the elastic reset member 36, causing the insertion rod 33 to push the first matching block 34 to abut against the first matching hole 13. At the same time, the insertion rod 33 drives the second matching block 37 at the bottom to move towards the top of the protective cover 32, and finally cooperates with the second matching hole 321 at the top of the protective cover 32. This allows the insertion rod 33 to be automatically positioned with the protective cover 32 through the second matching block 37 and the second matching hole 321. Based on the coaxial installation of the protective cover 32 and the mounting shell 21, a tight fit between the insertion rod 33 and the protective cover 32 is ensured, preventing assembly gaps between the connecting plate 12 and the protective cover 32 when the insertion rod 33 rotates, which would cause a delay in assisting the rotation.

[0062] The split-type recirculating ball electric power steering disclosed in this application also includes a fixing component 4. The fixing component 4 includes a plurality of fixing rods 43 corresponding to the insert rod 33. The fixing rods 43 are slidably disposed inside the fixing plate 31. The fixing plate 31 has through holes 311 corresponding to the fixing rods 43. The fixing rods 43 are driven upward by external force to press and fix the insert rod 33.

[0063] Specifically, a cage frame 38 is coaxially fixed on the side of the fixed plate 31 away from the protective cover 32. The cage frame 38 is coaxially fixedly connected to the ball screw 23 via a connecting shaft 39. The fixing assembly 4 also includes a screw 41, which is threaded inside the ball screw 23 through a screw hole 28. A bracket 42 is rotatably mounted on one end of the screw 41, and the bracket 42 is slidably mounted inside the cage frame 38. A fixing rod 43 is fixedly mounted on the top of the bracket 42. A connector 44 is fixedly mounted on the other end of the screw 41. A fixing block 45 is fixedly mounted on the outside of the connector 44. A reinforcing member 46, which is a reinforcing bolt, is threaded on the inside of the fixing block 45. A fixing ring 29 is fixedly mounted on the end of the ball screw 23 located outside the sealing shell 22. The fixing ring 29 is fixedly mounted to the fixing block 45 via the reinforcing member 46.

[0064] To ensure the stability between the first matching block 34 and the first matching hole 13, and between the second matching block 37 and the second matching hole 321, after the first matching block 34 and the first matching hole 13 are engaged, the screw 41 is driven to rotate inside the ball screw 23 by rotating the connecting piece 44 (at this time, the ball screw 23 is restricted by the worm gear shaft 11 and cannot rotate). When the screw 41 feeds inside the ball screw 23, it pushes the bracket 42 to slide along the inner side of the second matching block 37, so that the bracket 42 pushes the fixing rod 43 to press and fix the insertion rod 33. Finally, the reinforcing part 46 is rotated to fix the fixing block 45 and the fixing ring 29 to each other, further reinforcing the ball screw 23 and the screw 41, so that when the ball screw 23 rotates, it can drive the screw 41 and the fixing rod 43 to rotate synchronously.

[0065] The electric power assist assembly 1 also includes a power assist motor 15 for driving the reducer 14. The power assist motor 15 has a housing with an internal spiral channel on its outer side. A heat exchange assembly is fixedly mounted on the outer side of the mounting housing 21 via a mounting plate 210. The heat exchange assembly includes a heat dissipation plate 5, which is fixedly mounted on the outer side of the mounting plate 210. A heat dissipation channel is opened inside the heat dissipation plate 5. An outlet pipe 51 and an inlet pipe 52 are fixedly mounted at the output and input ends of the heat dissipation channel inside the heat dissipation plate 5, respectively. The outlet pipe 51 is connected to the input end of the outer housing of the power assist motor 15. A circulating liquid supply assembly 6 is provided at the other end of the inlet pipe 52. The input end of the circulating liquid supply assembly 6 is connected to the output end of the outer housing of the power assist motor 15. A semiconductor cooling chip is fixedly mounted on the outer side of the heat dissipation plate 5, and heat dissipation fins 53 are fixedly mounted on the outer side of the semiconductor cooling chip. A cooling fan 18 is fixedly mounted on the outer side of the reducer 14 via a connecting plate 17 for forced heat dissipation of the semiconductor cooling chip.

[0066] To ensure the safe operation of the power assist motor 15 in the electric power assist assembly 1, a heat sink 5 and a circulating liquid supply assembly 6 are fixedly installed on the outside of the mounting housing 21 via a mounting plate 210. The circulating liquid supply assembly 6 supplies circulating liquid into the interior of the heat sink 5. As the liquid passes through the channels inside the heat sink 5, it is cooled by the semiconductor cooling chip on the outside of the heat sink 5, allowing the cooler circulating liquid to enter the housing outside the power assist motor 15. The circulating liquid absorbs and transfers heat from the power assist motor 15 as it passes through the spiral channels inside the housing. During the cooling process, the heat dissipation fins 53 on the outside of the hot end of the semiconductor cooling chip help dissipate heat, and the cooling fan 18 fixedly installed via the connecting plate 17 provides forced cooling to the heat dissipation fins 53, ensuring timely heat dissipation at the hot end of the semiconductor cooling chip and enabling the cold end to perform cooling operations. The structure and principle of the housing with the spiral channels inside, the heat sink 5 with the heat dissipation channels inside, and the semiconductor cooling chip are all existing technologies and will not be described in detail here.

[0067] The circulating liquid supply assembly 6 includes a sealing cylinder 61 fixedly installed on the outside of the mounting plate 210. The output end of the sealing cylinder 61 is fixedly connected to the inlet pipe 52 through a one-way valve. The input end of the sealing cylinder 61 is fixedly connected to the return pipe 62 through a one-way valve. The other end of the return pipe 62 is connected to the outlet end of the outer housing of the booster motor 15. A piston 63 is slidably installed inside the sealing cylinder 61. The piston 63 is driven by an external force to slide back and forth.

[0068] Specifically, a push-pull rod 64 is fixedly installed inside the piston 63. A connecting rod 65 is rotatably installed at the other end of the push-pull rod 64. A swing rod 66 is rotatably installed at the other end of the connecting rod 65. The other end of the swing rod 66 is coaxially fixedly installed with the gear block 26. A liquid passage hole 631 is opened parallel to the axial direction inside the piston 63. A tapered groove 632 is provided at the end of the liquid passage hole 631 near the liquid inlet pipe 52. A sliding pin 67 is slidably installed inside the liquid passage hole 631. The sliding pin 67 is close to the axis of the piston 63 and slides in contact with the inner wall of the liquid passage hole 631. A sealing block 68 is fixedly installed at one end of the sliding pin 67 corresponding to the tapered groove 632. A limit ring 69 is fixedly installed at the other end of the sliding pin 67.

[0069] When the steering gear is running, the steering arm 27 located outside the sealing housing 22 swings back and forth. At this time, after the swing rod 66 is coaxially fixedly installed outside the sealing housing 22, the swing rod 66 can push the push-pull rod 64 to slide back and forth at one end of the sealing cylinder 61 via the connecting rod 65, thereby driving the piston 63 to slide back and forth inside the sealing cylinder 61. By utilizing the power of the steering gear to drive the circulating fluid supply assembly 6, the intervention of additional electrical components is reduced, thus reducing energy consumption and the failure rate. Specifically, the piston 63 slides towards the output end... When in motion, the circulating fluid at the output end pushes the sealing block 68 to move and engage with the inner side of the conical groove 632, so that the sealing block 68 blocks the fluid passage hole 631 inside the piston 63. When the piston 63 slides in the opposite direction, the circulating fluid enters the fluid passage hole 631 under the hydraulic action on the other side, pushing the sealing block 68 away from the conical groove 632, thereby automatically opening the fluid passage hole 631, so that the circulating fluid on the side of the piston 63 near the input end is transferred to the side near the output end through the fluid passage hole 631, realizing the circulation and transportation of the circulating fluid.

[0070] It should be noted that since the direction of the sealing cylinder 61 is inclined in three-dimensional space, and since the diameter of the sliding pin 67 is smaller than the inner diameter of the liquid passage 631, in order to prevent the sealing block 68 from dislodging from the conical groove 632, the sliding pin 67 will cause the sealing block 68 to be stuck on the outside of the conical groove 632 under the action of gravity. At this time, by sliding the sliding pin 67 close to the axis of the piston 63, regardless of the inclination direction of the sealing cylinder 61, it will be ensured that the sliding pin 67 supports the sealing block 68 and aligns it with the conical groove 632 in the axial direction, while not affecting the circulation function of the liquid passage 631.

[0071] The aforementioned steering mechanism also includes a cleaning assembly 7, which includes an electric push rod 71 fixedly mounted to the connecting plate 17. A support block 72 is fixedly mounted on the drive end of the electric push rod 71. A fixed shaft 73 is fixedly mounted on the inner side of the support block 72. A stop 74 is fixedly mounted on the end of the fixed shaft 73 away from the support block 72. A sleeve 75 is rotatably mounted on the outer side of the fixed shaft 73. A cleaning brush 76 is fixedly mounted on the outer side of the sleeve 75. Torsion springs 77 that apply downward torque are mounted on both ends of the sleeve 75. Limiting plates 78 for limiting the movement of the sleeve 75 are fixedly mounted on the bottom of both the support block 72 and the stop 74.

[0072] During long-term use, in order to prevent dust accumulation on the outside of the heat sink fins 53 from affecting the heat dissipation efficiency of the semiconductor cooling chip, the electric push rod 71 can be controlled to operate periodically. The electric push rod 71 drives the fixed shaft 73 on the inside of the support block 72 to move upward, and the fixed shaft 73 drives the cleaning brush 76 on the outside of the sleeve 75 to move towards the outside of the heat sink fins 53 for cleaning. The cleaned dust is blown downward by the cooling fan 18. When the cleaning brush 76 moves above the heat sink fins 53, the electric push rod 71 drives the cleaning brush 76 to move downward. At this time, under the action of the torsion spring 77, the cleaning brush 76 is elastically pressed against the outside of the heat sink fins 53 and the semiconductor cooling chip to ensure the cleaning effect. After cleaning, the cleaning brush 76 is placed below the heat sink fins 53 to prevent the cleaning brush 76 from interfering with the airflow of the cooling fan 18 and affecting the heat dissipation effect of the heat sink fins 53.

[0073] The principle and advantages of a split-type recirculating ball electric power steering system:

[0074] First, the mounting housing 21 is positioned and connected to the reducer 14 using bolts. At this time, the insert rod 33 inside the mounting housing 21 pushes the first matching block 34 against the bottom of the connecting plate 12 under the action of elastic force. Then, by rotating the steering arm 27 on the outside of the sealing housing 22, the ball screw 23 can be driven to rotate inside the sealing housing 22, causing the ball screw 23 to drive the insert rods 33 arranged in a ring on the top of the protective cover 32 to rotate synchronously. When the first matching block 34 at the top of the insert rod 33 slides into the first matching hole 13, it presses itself against the inside of the first matching hole 13 under the action of elastic force. The action of the first matching block 34 and the first matching hole 13 achieves rolling... The ball screw 23 is coaxially mounted with the worm gear shaft 11. When the insertion rod 33 drives the first matching block 34 to align with the first matching hole 13, the insertion rod 33 is pushed upward by the elastic reset member 36, so that the insertion rod 33 pushes the first matching block 34 to abut against the first matching hole 13. At the same time, the insertion rod 33 drives the second matching block 37 at the bottom to move towards the top of the protective cover 32, and finally cooperates with the second matching hole 321 at the top of the protective cover 32. This allows the insertion rod 33 to be automatically positioned with the protective cover 32 through the second matching block 37 and the second matching hole 321. Based on the coaxial mounting of the protective cover 32 and the mounting shell 21, a tight fit between the insertion rod 33 and the protective cover 32 is ensured.

[0075] Finally, by rotating the connecting piece 44, the screw 41 is driven to rotate inside the ball screw 23 (at this time, the ball screw 23 is restricted by the worm gear shaft 11 and cannot rotate). When the screw 41 feeds inside the ball screw 23, it pushes the bracket 42 to slide along the inner side of the second matching block 37, so that the bracket 42 pushes the fixing rod 43 to press and fix the insertion rod 33. Finally, the reinforcing piece 46 is rotated to fix the fixing block 45 and the fixing ring 29 to each other, further reinforcing the ball screw 23 and the screw 41, so that when the ball screw 23 rotates, it can drive the screw 41 and the fixing rod 43 to rotate synchronously.

[0076] Its advantages include: the insertion rod 33 pushes the first matching block 34 to automatically engage with the first matching hole 13 on one side of the connecting plate 12; the first matching hole 13 and the first matching block 34 ensure that the insertion rod 33 and the connecting plate 12 are tightly installed in both the axial and radial directions, allowing the worm gear shaft 11 to drive the ball screw 23 to rotate synchronously, ensuring the connection accuracy between the worm gear shaft 11 and the ball screw 23; and the rigid structure connection makes the whole more stable and stronger, while reducing the difficulty of processing and installation. Furthermore, the elastic drive of the first matching block 34 at the end of the insertion rod 33 automatically engages with the first matching hole 13, so that... After the reducer 14 and mounting housing 21 are positioned and installed, the internal worm gear shaft 11 and ball screw 23 are connected. By rotating the steering arm 27 on the outside of the sealing housing 22, the ball screw 23 can be driven to rotate and adjust the position of the first matching block 34, so as to move the first matching block 34 to the position aligned with the first matching hole 13 to achieve automatic coaxial connection. When the fixed rod 43 is driven by rotating the screw 41 to reinforce the insertion rod 33, the locking effect of the worm gear shaft 11 on the ball screw 23 can be used to prevent the screw 41 and the ball screw 23 from rotating relative to each other, so as to quickly reinforce the insertion rod 33.

[0077] In this application's split-type recirculating ball electric power steering system, when the power steering motor 15 is dissipating heat, the steering arm 27 located outside the sealing housing 22 swings back and forth while the steering system is running. After a swing rod 66 is coaxially fixedly installed outside the sealing housing 22, the swing rod 66 pushes the push-pull rod 64 to slide back and forth at one end of the sealing cylinder 61 via the connecting rod 65, thereby causing the piston 63 to slide back and forth inside the sealing cylinder 61. When the piston 63 slides towards the output end, the circulating fluid at the output end pushes the sealing block 68 to move and engage with the inner side of the conical groove 632, causing the sealing block 68 to block the fluid passage hole 631 inside the piston 63. When the piston 63 slides in the reverse direction, the hydraulic pressure on the other side causes the circulating fluid to enter the fluid passage hole 631, pushing the sealing block 68 away from the conical groove 632, thereby automatically opening the fluid passage hole 631. This allows the circulating fluid on the side of the piston 63 closest to the input end to transfer to the side closest to the output end through the fluid passage hole 631, achieving the circulation and delivery of the circulating fluid.

[0078] It should be noted that since the direction of the sealing cylinder 61 is inclined in three-dimensional space, and since the diameter of the sliding pin 67 is smaller than the inner diameter of the liquid passage 631, in order to prevent the sealing block 68 from dislodging from the conical groove 632, the sliding pin 67 will cause the sealing block 68 to be stuck on the outside of the conical groove 632 under the action of gravity. At this time, by sliding the sliding pin 67 close to the axis of the piston 63, regardless of the inclination direction of the sealing cylinder 61, it will be ensured that the sliding pin 67 supports the sealing block 68 and aligns it with the conical groove 632 in the axial direction, while not affecting the circulation function of the liquid passage 631.

[0079] After the circulating liquid is introduced into the heat sink 5 through the circulating liquid supply assembly 6, the liquid is cooled by the semiconductor cooling chip on the outside of the heat sink 5 as it passes through the channel inside the heat sink 5. This allows the lower-temperature circulating liquid to enter the housing outside the booster motor 15. The circulating liquid absorbs and transfers heat from the booster motor 15 as it passes through the spiral channel inside the housing. During the cooling process, the heat dissipation fins 53 on the outside of the hot end of the semiconductor cooling chip help dissipate heat, and the cooling fan 18 fixedly installed on the connecting plate 17 provides forced heat dissipation to the heat dissipation fins 53.

[0080] It is worth noting that the above-mentioned heat dissipation methods have the following advantages:

[0081] One advantage is that by using the power of the steering gear to drive the circulating fluid supply component 6, the intervention of additional electrical components is reduced, which reduces energy consumption and the failure rate.

[0082] Secondly, by sliding the sliding pin 67 close to the axis of the piston 63, regardless of the tilt direction of the sealing cylinder 61, the sliding pin 67 will ensure that the sealing block 68 and the conical groove 632 are aligned axially, while not affecting the circulation function of the liquid passage hole 631.

[0083] Thirdly, by placing the heat sink 5 at the output end of the circulating liquid supply assembly 6, the circulating liquid inside the circulating liquid supply assembly 6 carries heat, thereby ensuring that the piston 63 is always in the hot zone and preventing the internal temperature of the circulating liquid supply assembly 6 from being too low, which would affect the sealing performance of the piston 63 and the stability of other components (the cooling range of the semiconductor cooling chip in the prior art can reach a temperature difference of -130°C to 90°C).

[0084] In practical applications, the cleaning methods for the hot end of the semiconductor cooling chip and the heat sink fins 53 are as follows:

[0085] By controlling the electric push rod 71 to operate periodically, the electric push rod 71 drives the fixed shaft 73 on the inner side of the support block 72 to move upward. The fixed shaft 73 drives the cleaning brush 76 on the outer side of the sleeve 75 to move towards the outer side of the heat dissipation fins 53 for cleaning. The cleaned dust is blown downward by the cooling fan 18. When the cleaning brush 76 moves above the heat dissipation fins 53, the electric push rod 71 drives the cleaning brush 76 to move downward. At this time, under the action of the torsion spring 77, the cleaning brush 76 is elastically pressed against the outer side of the heat dissipation fins 53 and the semiconductor cooling chip to ensure the cleaning effect. After cleaning, the cleaning brush 76 is placed below the heat dissipation fins 53 to prevent the cleaning brush 76 from interfering with the airflow of the cooling fan 18 and affecting the heat dissipation effect of the heat dissipation fins 53.

[0086] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A split-type recirculating ball electric power steering system, characterized in that, include: Electric power steering components; The steering component is detachably mounted on the drive end of the electric power steering component, forming a separate configuration from the electric power steering component. The positioning component, located inside the steering component, is used for coaxial connection with the drive end of the electric power steering component; The electric power assist assembly includes a worm gear shaft rotatably mounted on one side of the reducer, a connecting plate fixedly mounted at the end of the worm gear shaft, a first matching hole opened on the inner side of the connecting plate, and an input shaft rotatably mounted on the side of the reducer away from the connecting plate. The steering assembly includes a detachable mounting housing disposed on the outside of the reducer, and the positioning assembly is disposed in the mounting housing; a sealing shell is fixedly disposed at the bottom of the mounting housing, and a ball screw is disposed inside the sealing shell; The positioning component includes a fixed plate fixedly disposed at the end of the ball screw, a protective cover fixedly disposed on the outside of the fixed plate, and an insert rod slidably disposed on the inside of the protective cover. Several insert rods are provided, and a first matching block is fixedly disposed on the top of each insert rod. The first matching block cooperates with a first matching hole, and the first matching block is fitted inside the first matching hole under the action of axial elastic force. A second matching block is fixedly installed at the bottom of the insertion rod, and an elastic reset member is fixedly installed at the bottom of the second matching block. Both the elastic reset member and the second matching block are located inside the protective cover. A second matching hole is opened at the top of the protective cover corresponding to the second matching block. The protective cover is coaxially rotatably installed inside the mounting shell. It also includes a fixing component, which includes a plurality of fixing rods corresponding to the insertion rod. The fixing rods are slidably disposed inside the fixing plate. The fixing plate has through holes corresponding to the fixing rods on its inner side. The fixing rods are driven upward by external force to press and fix the insertion rods. A cage frame is coaxially fixed on the side of the fixed plate away from the protective cover. The cage frame is coaxially fixedly connected to the ball screw via a connecting shaft. The fixing assembly also includes a screw, which is threaded inside the ball screw. A bracket is rotatably mounted on one end of the screw. The bracket is slidably mounted inside the cage frame. The fixing rod is fixedly mounted on the top of the bracket.

2. The split-type recirculating ball electric power steering system according to claim 1, characterized in that, A connector is fixedly provided at the other end of the screw, a fixing block is fixedly provided on the outside of the connector, and a reinforcing member is threaded on the inside of the fixing block; A fixing ring is fixedly installed at one end of the ball screw located outside the sealing shell, and the fixing ring is fixedly installed to the fixing block by a reinforcement component.

3. The split-type recirculating ball electric power steering system according to claim 1, characterized in that, The electric power assist assembly also includes a power assist motor for driving the reducer, and the power assist motor has a housing with an internal spiral channel on its outer side, and a heat exchange assembly is fixedly installed on the outer side of the housing. The heat exchange component includes a heat sink plate, which is fixedly installed on the outside of the mounting plate. A heat dissipation channel is opened inside the heat sink plate. A circulating liquid supply component is connected to one side of the heat sink plate, and the heat dissipation liquid enters the outer housing of the power motor through the heat dissipation channel from the circulating liquid supply component.

4. The split-type recirculating ball electric power steering system according to claim 3, characterized in that, The circulating liquid supply assembly includes a sealing cylinder fixedly installed on the outside of the mounting plate. The output end of the sealing cylinder is connected to the heat dissipation channel, and the input end of the sealing cylinder is connected to the outer housing of the booster motor. A piston is slidably disposed inside the sealing cylinder, and the piston is driven to slide back and forth by an external force.

5. The split-type recirculating ball electric power steering system according to claim 4, characterized in that, A push-pull rod is fixedly installed on the inner side of the piston, and a connecting rod is rotatably installed at the other end of the push-pull rod, and a swing rod is rotatably installed at the other end of the connecting rod.

6. The split-type recirculating ball electric power steering system according to claim 5, characterized in that, A ball sleeve is provided on the outer side of the ball screw, and the ball sleeve is slidably disposed within the sealing shell; A toothed plate is fixedly provided on one side of the ball sleeve, and a gear block is meshed with the toothed plate; The end of the swing rod away from the connecting rod is fixedly mounted coaxially with the gear block.

7. The split-type recirculating ball electric power steering system according to claim 4, characterized in that, The piston has a liquid passage hole parallel to the axial direction on its inner side, and a conical groove is provided at one end of the liquid passage hole near the liquid inlet pipe. A sliding pin is slidably provided inside the liquid passage hole. The sliding pin is close to the axis of the piston and slides in contact with the inner wall of the liquid passage hole. A sealing block is fixedly provided at one end of the sliding pin corresponding to the conical groove, and a limit ring is fixedly provided at the other end of the sliding pin.

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