A high-seal steering system

Abstract

The present application relates to the technical field of vehicle steering, and particularly relates to a high-sealing steering system, which comprises a shell assembly, a transmission assembly and an output assembly arranged in the shell assembly; the output assembly comprises an output unit and a compensation unit; the output unit comprises a tooth fan and an output shaft; the transmission assembly is drivingly connected with the tooth fan and the output shaft; the compensation unit comprises a screw rod, a nut and a sealing element connected with the output shaft; the nut is sleeved on the screw rod; the shell assembly is provided with a sealing groove, and the sealing element is arranged in the sealing groove; the sealing element comprises a sealing body, a first protrusion and a second protrusion; the first protrusion extends in a first direction, part of the first protrusion abuts against the screw rod and a second shell unit, and the other part of the first protrusion has a first gap with the screw rod; the minimum inner diameter of the sealing element is smaller than the maximum outer diameter of the screw rod; the second protrusion extends towards the nut; in a compressed state, part of the second protrusion abuts against the nut and extends into the first gap. The problem of poor sealing effect between the traditional sealing ring and the adjusting screw and the locking nut is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle steering technology, in particular to a high-sealing steering system. BACKGROUND

[0002] In the steering system of an automobile, in order to eliminate the gap between the tooth fan and the toothed nut (or rack) during meshing transmission, and to ensure the stability and accuracy of the steering force transmission, an elastic compensation mechanism is usually arranged at one end of the output shaft in the axial direction. The mechanism generally includes a spring, an adjusting screw, a locking nut and other components. The output shaft and the tooth fan on it are forced to produce a slight axial movement by the pre-tightening force of the spring, so that the tooth fan and the toothed nut always maintain a close meshing state without gap. This design is crucial to improve the steering feel and system durability.

[0003] The steering system housing is filled with lubricating oil. In order to ensure the sealing of the housing, a sealing ring is usually added between the housing and the adjusting screw and the locking nut. However, it is difficult to achieve a tight fit between the traditional sealing ring and the adjusting screw and the locking nut, so that the housing filled with lubricating oil is prone to leakage along the thread gap of the locking screw under the pressure generated by the gear stirring and temperature change. In order to solve the leakage problem, the inner diameter of the traditional sealing ring is made smaller than the outer diameter of the adjusting screw, but this method makes it difficult to adjust the position of the adjusting screw and the locking nut. Therefore, there is an urgent need for a high-sealing steering system to solve the problem of poor sealing effect between the traditional sealing ring and the adjusting screw and the locking nut, and the difficulty in adjusting the position of the three after sealing. SUMMARY

[0004] To solve the problem of poor sealing effect between the traditional sealing ring and the adjusting screw and the locking nut, and the difficulty in adjusting the position of the three after sealing, the present application provides a high-sealing steering system, comprising:

[0005] A housing assembly and a transmission assembly, the housing assembly comprising a first shell unit and a second shell unit connected in sequence; the transmission assembly is arranged in the first shell unit;

[0006] An output assembly arranged in the second shell unit;

[0007] The output assembly comprises an output unit and a compensation unit; the output unit comprises a tooth fan and an output shaft formed integrally; the transmission assembly drives the tooth fan, and the tooth fan drives the output shaft to rotate along the central axis of the tooth fan; the compensation unit comprises a screw rod, a nut and a sealing member; the screw rod penetrates through one side of the second shell unit and is connected to one end of the output shaft; the nut is sleeved on the screw rod and located at the side of the second shell unit away from the output shaft; the side of the second shell unit close to the nut is provided with a sealing groove, and the sealing member is located in the sealing groove and sleeved on the outer circumferential side of the screw rod; the sealing member is annular;

[0008] The sealing element comprises an integrally formed sealing body, a first protrusion and a second protrusion; the first protrusion extends along one side of the sealing body in a first direction, part of the first protrusion abuts the screw and the second housing unit, and another part of the first protrusion has a first gap with the screw; the minimum inner diameter of the sealing element is smaller than the maximum outer diameter of the screw; the second protrusion extends from one side of the sealing body to the nut; in the compressed state, part of the second protrusion is pressed to abut the nut and extends to the first gap.

[0009] In some embodiments, in the compressed state, the second protrusion is subjected to pressure in the first direction, which is the central axis of the screw, part of the second protrusion abuts the nut and extends to the first gap, and another part of the second protrusion has a second gap with the nut.

[0010] In some embodiments, the sealing element further comprises a third protrusion integrally formed with the sealing body, the first protrusion and the second protrusion; part of the third protrusion extends away from the screw in a second direction and abuts the side wall and the bottom wall; the second direction is perpendicular to the first direction, and the second direction is the radial direction of the screw; the angle formed by the bottom wall and the inner surface of the side wall is an acute angle.

[0011] The second housing unit comprises a bottom wall and a side wall, the bottom wall and the side wall are connected and form a sealing groove, and the bottom wall abuts the side of the sealing element away from the nut.

[0012] In some embodiments, the sealing element further comprises a third protrusion integrally formed with the sealing body, the first protrusion and the second protrusion; the third protrusion extends away from the screw in a second direction and abuts the side wall and the bottom wall; the second direction is perpendicular to the first direction; the bottom wall is arranged perpendicular to the side wall, part of the third protrusion abuts the bottom wall and the side wall respectively, and another part of the third protrusion has a third gap with the side wall.

[0013] The second housing unit comprises a bottom wall and a side wall, the bottom wall and the side wall are connected and form a sealing groove, and the bottom wall abuts the side of the sealing element away from the nut.

[0014] In some embodiments, in the compressed state, the maximum value of the third gap is smaller than the maximum value of the first gap.

[0015] In some embodiments, in the compressed state, the nut abuts the second housing unit and part of the second protrusion respectively; the abutting surface of the second housing unit and the nut is a compensation abutting surface; the height of the compensation abutting surface along the first direction to the bottom wall is greater than or equal to the minimum height of the second protrusion along the first direction.

[0016] In some embodiments, the high-sealing steering system further comprises:

[0017] The second shell unit is provided with a through hole along the axial direction of the screw, the screw passes through the through hole and is connected with one end of the output shaft; the second shell unit is provided with a chamfered groove on the side facing the nut; the chamfered groove is communicated with the sealing groove; in the compressed state, the first protrusion extends into the chamfered groove.

[0018] In some embodiments, the high-sealing steering system further comprises:

[0019] The driving assembly is located in the first shell unit; the driving assembly comprises a driving part and a speed reduction part; the driving part is drivingly connected with the speed reduction part; the speed reduction part is drivingly connected with the transmission assembly.

[0020] In some embodiments, the transmission assembly comprises a screw shaft, a rolling body and a thread nut; the screw shaft is drivingly connected with the speed reduction part; the thread nut is sleeved on the screw shaft and forms an inner raceway with the screw shaft; the rolling body is located in the inner raceway; the screw shaft drives the thread nut to move along the axial direction of the screw shaft through the rolling body.

[0021] In some embodiments, the tooth fan is drivingly connected with the thread nut, and the thread nut drives the tooth fan to rotate along the central axis of the tooth fan.

[0022] To solve the problem that the sealing effect between the traditional sealing ring, the adjusting screw and the locking nut is poor and it is difficult to adjust the positions among the three after sealing, the present application has the following advantages:

[0023] The sealing member is designed to have a special sealing structure with a first protrusion and a second protrusion formed integrally, which can effectively guide the deformation direction of the sealing member when the nut is compressed, thereby ensuring the sealing property of the shell assembly. After being extruded, the second protrusion extends in the direction of the screw and enters the first gap between the first protrusion and the screw, avoiding that part of the sealing member is extruded into the abutting surface between the nut and the second shell unit and damages the sealing; the minimum inner diameter of the sealing member is smaller than the maximum outer diameter of the screw, which further enhances the radial holding force of the sealing member on the screw and significantly improves the static and dynamic sealing performance.

[0024] Meanwhile, the preset structure of the first gap provides space for the elastic recovery of the sealing member after the nut is loosened, which greatly reduces the frictional resistance between the sealing member and the surface of the screw, and makes the operation of correcting and adjusting the position of the screw more labor-saving and flexible in the later stage, realizing the unity of sealing reliability and adjustment convenience. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 shows a cross-sectional view of part of the driving assembly and the transmission assembly in an embodiment of the high-sealing steering system;

[0026] Figure 2 shows a structural schematic view of an embodiment of the high-sealing steering system;

[0027] Figure 3Another structural schematic diagram of a high-sealing steering system according to one embodiment is shown;

[0028] Figure 4 A cross-sectional view of a high-sealing steering system according to an embodiment is shown;

[0029] Figure 5 An AA cross-sectional view of an embodiment of a high-sealing steering system is shown;

[0030] Figure 6 A structural diagram of the seal of a high-sealing steering system according to an embodiment is shown;

[0031] Figure 7 A BB cross-sectional view of an embodiment of a high-sealing steering system is shown;

[0032] Figure 8 An embodiment of a high-sealing steering system is shown. Figure 5 A magnified view of the C in the image;

[0033] Figure 9 An embodiment of a high-sealing steering system is shown. Figure 8 A partial view of the area without the seals installed;

[0034] Figure 10 Another embodiment of a highly sealed steering system is shown. Figure 8 A partial view of the area without the seals installed.

[0035] Figure label:

[0036] 10. Housing assembly; 11. First housing unit; 12. Second housing unit; 121. Output end housing; 122. Support end housing; 1221. Connecting thread; 1222. Chamfered groove; 1223. Sealing groove; 1224. Bottom wall; 1225. Side wall; 1226. Compensating contact surface; 20. Drive assembly; 21. Drive unit; 22. Reduction unit; 30. Transmission assembly; 31. Lead screw shaft; 32. Tooth screw nut; 40. Output assembly; 41. Output unit; 411. Gear sector; 412. Output shaft; 42. Compensating unit; 421. Screw; 422. Nut; 423. Seal; 4231. Sealing body; 4232. First protrusion; 4233. Second protrusion; 4234. Third protrusion. Detailed Implementation

[0037] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0038] As used herein, the term "includes" and its variants are to be read as open-ended terms that mean "including, but not limited to." The term "based on" is to be construed as "based at least in part on." The terms "one embodiment" and "an embodiment" are to be read as "at least one embodiment." The term "another embodiment" is to be read as "at least one other embodiment." The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," "longitudinal," and similar terms are used for orientation or position relationships based on the orientation or position relationships shown in the drawings. These terms are primarily used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a particular orientation, or to be constructed and operated in a particular orientation. Also, in addition to indicating orientation or position relationships, some of the above terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances. In addition, the terms "mounting", "providing", "provided with", "connecting", "connected" should be understood broadly. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are primarily used to distinguish different devices, elements or components (the specific types and structures can be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0039] The steering system of a vehicle is a core component of the chassis system, and its function is to reliably transmit the steering intention of the driver to the wheels, which is directly related to driving safety and handling experience. The durability and reliability of the vehicle steering system is closely related to the effective lubrication of its internal transmission components. In order to reduce the wear of key moving pairs such as toothed fan and bearing, reduce operating noise and improve transmission efficiency, a special lubricating oil or grease needs to be filled in the steering gear housing to form a long-term lubrication environment. In order to eliminate the gap between the toothed fan and the toothed wire mother (or rack) during meshing transmission, an elastic compensation mechanism is usually arranged at one end of the output shaft in the axial direction, and a sealing ring is used to ensure the sealing in the related art, but the effect is not good, resulting in leakage of lubricating oil or grease, and the inner diameter of the sealing ring is too small to adjust the position of the elastic compensation mechanism.

[0040] Therefore, the application provides a high-sealing steering system, which can solve the problem of poor sealing effect between the traditional sealing ring, the adjusting screw and the locking nut and the problem of difficult adjustment of the positions of the three after sealing.

[0041] Embodiment one

[0042] Please refer to Figure 1 , Figure 2 and Figure 3 , the embodiment provides a high-sealing steering system, which comprises:

[0043] The housing assembly 10, the transmission assembly 30, the driving assembly 20 and the output assembly 40; the housing assembly 10 is internally hollow; the housing assembly 10 comprises a first shell unit 11 and a second shell unit 12 connected in sequence, and the first shell unit 11 and the second shell unit 12 form a sealed cavity; the transmission assembly 30 and the driving assembly 20 are detachably arranged in the first shell unit 11; the output assembly 40 is detachably arranged in the second shell unit 12, wherein the housing assembly 10 is filled with lubricating oil or grease, so as to ensure that the inside of the housing assembly 10 is a long-acting lubricating environment.

[0044] Further, the driving assembly 20 comprises a driving part 21 and a speed reduction part 22; the driving part 21 is drivingly connected with the speed reduction part 22, and the driving part 21 provides power for the speed reduction part 22; the speed reduction part 22 is drivingly connected with the transmission assembly 30, wherein the driving part 21 can be a motor.

[0045] Further, please refer to Figure 4 , the transmission assembly 30 comprises a screw shaft 31, a rolling body (not shown in the figure) and a thread nut 32; the screw shaft 31 is drivingly connected with the speed reduction part 22, i.e. the motor drives the speed reduction part 22, and the speed reduction part 22 can comprise a worm and a worm wheel, and the speed reduction part 22 drives the screw shaft 31 to rotate. The thread nut 32 is sleeved on the screw shaft 31 and forms an inner raceway with the screw shaft 31; the rolling body is located in the inner raceway and rolls in the inner raceway, and the rolling body converts the sliding friction between the screw shaft 31 and the thread nut 32 into rolling friction, effectively reducing the wear between the three. The screw shaft 31 drives the thread nut 32 to move along the axial direction of the screw shaft 31 through the rolling body, converting the rotation of the screw shaft 31 into the axial movement of the thread nut 32 along the screw shaft 31.

[0046] In the embodiment, please refer to Figure 4 and Figure 5The output assembly 40 comprises an output unit 41 and a compensation unit 42. The output unit 41 comprises a toothed fan 411 and an output shaft 412 which are integrally formed. The toothed fan 411 is drivingly connected with the toothed nut 32. The toothed nut 32 drives the toothed fan 411 to rotate along the central axis of the toothed fan 411. The toothed fan 411 drives the output shaft 412 to move axially. The abrasion between the screw shaft 31 and the toothed nut 32 is reduced, and the transmission efficiency is improved. Meanwhile, the steering accuracy of the steering mechanism can be controlled by the motor.

[0047] In the embodiment, please refer to Figure 1 and Figure 5 The compensation unit 42 comprises a screw rod 421, a nut 422 and a sealing member 423. The screw rod 421 penetrates through one side of the second shell unit 12 and is connected with one end of the output shaft 412.

[0048] Specifically, the second shell unit 12 further comprises a connected output end shell 121 and a supporting end shell 122. The supporting end shell 122 seals the output end shell 121. The interiors of the two form cavities which are filled with lubricating oil or grease. The output assembly 40 is detachably arranged in the cavity formed by the supporting end shell 122 and the output end shell 121. One end of the screw rod 421 penetrates through one side of the supporting end shell 122 and is connected with one end of the output shaft 412. One end of the output shaft 412 is connected with the screw rod 421, and the other end penetrates through the output end shell 121. The part of the output shaft 412 which penetrates through the output end shell 121 can be connected with an external steering linkage mechanism. The specific connection mode depends on the actual application.

[0049] In the embodiment, please refer to Figure 5 、 Figure 6 and Figure 7 The nut 422 is sleeved on the screw rod 421. The nut 422 is located on the side of the supporting end shell 122 which is away from the output shaft 412. The side of the supporting end shell 122 which is close to the nut 422 is provided with a sealing groove 1223. The sealing member 423 is located in the sealing groove 1223 and is sleeved on the outer circumferential side of the screw rod 421. The sealing member 423 is used for sealing the gap among the screw rod 421, the nut 422 and the supporting end shell 122, preventing the lubricating oil or grease from leaking or preventing the external dust or impurities from entering the cavity and the gap among the parts.

[0050] In the embodiment, the sealing member 423 is annular, and the specific shape is subject to actual application. The sealing member 423 comprises a sealing body 4231, a first protrusion 4232 and a second protrusion 4233. The first protrusion 4232 extends along one side of the sealing body 4231 in a first direction, which is the central axis of the screw 421. Part of the first protrusion 4232 abuts against the screw 421 and the support end shell 122, and the other part of the first protrusion 4232 has a first gap with the screw 421. The minimum inner diameter of the sealing member 423 is smaller than the maximum outer diameter of the screw 421. The second protrusion 4233 extends from one side of the sealing body 4231 to the nut 422. In the compressed state, part of the second protrusion 4233 is pressed to abut against the nut 422 and extend to the first gap.

[0051] It can be understood that part of the first protrusion 4232 abuts against the screw 421 and the support end shell 122, and the minimum inner diameter of the sealing member 423 is smaller than the maximum outer diameter of the screw 421, which can effectively increase the radial holding force of the sealing member 423 and the screw 421 to ensure the sealing performance and prevent the lubricating liquid or grease from leaking from the gap between the screw 421 and the support end shell 122, thereby significantly improving the overall static and dynamic sealing performance.

[0052] In addition, the first protrusion 4232 and the second protrusion 4233 can effectively guide the deformation direction of the sealing member 423 when the nut 422 is compressed towards the support end shell 122. In the compressed state, part of the second protrusion 4233 is pressed to abut against the nut 422 and extend to the first gap, which can avoid part of the sealing member 423 being squeezed into the abutting surface of the nut 422 and the support end shell 122 to damage the seal. Based on the preset structure of the first gap, the elastic recovery space is provided for adjusting the position of the nut 422 or the screw 421, which greatly reduces the frictional resistance between the sealing member 423 and the surface of the screw 421, and improves the efficiency of the position correction of the nut 422 and the screw 421 in the later stage.

[0053] Further, in the compressed state, the second protrusion 4233 is subjected to a pressure in the first direction, which is the central axis of the screw 421. Part of the second protrusion 4233 abuts against the nut 422 and extends to the first gap, and the other part of the second protrusion 4233 has a second gap with the nut 422.

[0054] It can be understood that the sealing member 423 includes a compression state and an installation state. In the installation state, part of the second protrusions 4233 extends to the nut 422, and the other part of the second protrusions 4233 has a second gap with the nut 422, so that the second protrusions 4233 are prevented from being squeezed into the nut 422 and the compensation abutting surface 1226 of the support end shell 122 to damage the seal. In the compression state, the second protrusions 4233 are pressed by the nut 422 in the direction of the support end shell 122, part of the second protrusions 4233 abut the nut 422 and extend to the first gap, and the other part of the second protrusions 4233 still has a second gap between the nut 422, so that the second protrusions 4233 are prevented from being squeezed into the nut 422 and the compensation abutting surface 1226 of the support end shell 122 to damage the seal.

[0055] In the embodiment, please refer to Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 , the sealing member 423 further includes third protrusions 4234, which are integrally formed with the sealing body 4231, the first protrusions 4232 and the second protrusions 4233. Part of the third protrusions 4234 extends along a second direction away from the screw rod 421 and abuts against the side wall 1225 and the bottom wall 1224. The second direction is perpendicular to the first direction, and the second direction is the radial direction of the screw rod 421. The angle formed by the inner surfaces of the bottom wall 1224 and the side wall 1225 is an acute angle.

[0056] The support end shell 122 includes a bottom wall 1224 and a side wall 1225, which are connected to form a sealing groove 1223, and the bottom wall 1224 abuts against the side of the sealing member 423 away from the nut 422.

[0057] In the embodiment, the angle formed by the inner surfaces of the bottom wall 1224 and the side wall 1225 is an acute angle, and the third protrusions 4234 extend along the second direction away from the screw rod 421 and abut against the side wall 1225 and the bottom wall 1224. Part of the third protrusions 4234 closely abut against the side wall 1225 and the bottom wall 1224. Due to the angle between the bottom wall 1224 and the side wall 1225, the lubricating oil or grease is more difficult to leak than the sealing ring in the related art, and the sealing is achieved.

[0058] Further, in the compression state, the nut 422 abuts against the support end shell 122 and part of the second protrusions 4233. The surface of the support end shell 122 abutting against the nut 422 is a compensation abutting surface 1226. The height of the compensation abutting surface 1226 along the first direction to the bottom wall 1224 is greater than or equal to the minimum height of the second protrusions 4233 along the first direction.

[0059] It can be understood that, in order to prevent part of the second protrusion 4233 from entering between the nut 422 and the compensation abutting surface 1226 of the support end shell 122, the height of the bottom wall 1224 is set to be greater than or equal to the minimum height of the second protrusion 4233 in the first direction, so that the second protrusion 4233 can change deformation when subjected to the force of the nut 422 towards the support end shell 122, extend to the gap formed by the height difference or extend to the first gap, avoid the existence of the gap between the nut 422 and the compensation abutting surface 1226 of the support end shell 122, and thus affect the sealing.

[0060] Further, the high-sealing steering system further comprises:

[0061] The second shell unit 12 is provided with a through hole in the axial direction of the screw rod 421, and the screw rod 421 passes through the through hole and is connected to one end of the output shaft 412; the side of the second shell unit 12 facing the nut 422 is provided with a chamfer groove 1222; the chamfer groove 1222 is in communication with the sealing groove 1223; in the compressed state, the first protrusion 4232 extends into the chamfer groove 1222.

[0062] Specifically, the support end shell 122 of the second shell unit 12 is provided with a connecting thread 1221, the screw rod 421 passes through the through hole and is threadedly connected to the support end shell 122 through the connecting thread 1221. And, in the compressed state, in order to improve the sealing effect, the first protrusion 4232 extends into the chamfer groove 1222, further preventing the leakage of lubricating liquid or grease.

[0063] Embodiment two

[0064] The embodiment provides a high-sealing steering system, which has the same structure and connection mode as part of the structure and connection mode in embodiment one, and the same structure and connection mode includes the shell assembly 10, the driving assembly 20, the transmission assembly 30 and the output unit 41 of the output assembly 40, so in this embodiment, it will not be repeated, and for details, please refer to embodiment one. The difference lies in that the compensation unit 42 of the output assembly 40, specifically as follows: in this embodiment, please refer to Figure 10 The sealing member 423 further comprises a third protrusion 4234, the third protrusion 4234 is integrally formed with the sealing body 4231, the first protrusion 4232 and the second protrusion 4233; the third protrusion 4234 extends away from the screw rod 421 along a second direction and abuts against the side wall 1225; the second direction is perpendicular to the first direction; the bottom wall 1224 is arranged vertically opposite to the side wall 1225, part of the third protrusion 4234 abuts against the bottom wall 1224 and the side wall 1225 respectively, and the other part of the third protrusion 4234 has a third gap with the side wall 1225;

[0065] The second shell unit 12 is provided with a bottom wall 1224 and a side wall 1225, the bottom wall 1224 and the side wall 1225 are connected and form a sealing groove 1223, and the bottom wall 1224 abuts against the side away from the nut 422 of the sealing element 423.

[0066] Further, in the compressed state, the maximum value of the third gap is smaller than the maximum value of the first gap.

[0067] Specifically, the bottom wall 1224 is arranged vertically opposite to the side wall 1225, and part of the third protrusions 4234 abut against the bottom wall 1224 and the side wall 1225, so that part of the third protrusions 4234 abut against the vertically arranged bottom wall 1224 and the side wall 1225 to form a closer fit, so that the lubricating oil or lubricating grease is more difficult to leak than the sealing ring in the related art, and sealing is achieved. The third protrusions 4234 that do not abut against the bottom wall 1224 and the side wall 1225 form a third gap with the side wall 1225, and the second protrusions 4233 under compression can enter the first gap, the second gap and / or the third gap, thereby preventing the second protrusions 4233 from entering between the nut 422 and the compensation abutting surface 1226 of the support end shell 122 to the greatest extent, and ensuring sealing.

[0068] Embodiment three:

[0069] The embodiment provides a high-sealing steering method based on the high-sealing steering system provided in the embodiments one and two, and the method comprises the following steps.

[0070] The screw rod 421 is inserted through the through hole and is screwed with the support end shell 122 through the connecting thread 1221, the nut 422 is sleeved on the screw rod 421, and the sealing element 423 is placed in the sealing groove 1223 and is screwed on the screw rod 421. The nut 422 is tightened, so that the sealing element 423 is extruded, the first protrusions 4232 extend in the first direction and abut against the screw rod 421 and the bottom wall 1224, and can extend into the chamfer groove 1222, the second protrusions 4233 abut against the nut 422 and can extend into the first gap and the second gap, and the third protrusions 4234 abut against the bottom wall 1224 and the side wall 1225.

[0071] Those skilled in the art can understand that the above-mentioned embodiments are specific cases for realizing the present disclosure, and in actual application, various changes can be made in form and details without departing from the scope of the present disclosure.

Claims

1. A high-seal steering system, characterized by, The high-sealing steering system comprises: a housing assembly and a transmission assembly, the housing assembly comprising a first housing unit and a second housing unit connected in sequence; the transmission assembly is arranged in the first housing unit; an output assembly arranged in the second housing unit; the output assembly comprises an output unit and a compensation unit; the output unit comprises an integrally formed tooth fan and an output shaft; the transmission assembly drives the tooth fan, the tooth fan drives the output shaft to rotate along the central axis of the tooth fan; the compensation unit comprises a screw rod, a nut and a sealing element; the screw rod penetrates through one side of the second housing unit and is connected with one end of the output shaft; the nut is sleeved on the screw rod and located on the side of the second housing unit away from the output shaft; the side of the second housing unit close to the nut is provided with a sealing groove, the sealing element is located in the sealing groove and sleeved on the outer circumferential side of the screw rod; the sealing element is annular; the sealing element comprises an integrally formed sealing body, a first protrusion and a second protrusion; the first protrusion extends in a first direction along one side of the sealing body, part of the first protrusion abuts against the screw rod and the second housing unit, and the other part of the first protrusion has a first gap with the screw rod; the minimum inner diameter of the sealing element is smaller than the maximum outer diameter of the screw rod; the second protrusion extends from one side of the sealing body to the nut; in the compressed state, part of the second protrusion is pressed and abuts against the nut and extends to the first gap.

2. The high-sealing steering system according to claim 1, wherein in the compressed state, the second protrusion is subjected to pressure in the first direction, the first direction being the central axis of the screw rod, part of the second protrusion abuts against the nut and extends to the first gap, and the other part of the second protrusion has a second gap with the nut.

3. The high-sealing steering system according to claim 2, wherein the sealing element further comprises a third protrusion integrally formed with the sealing body, the first protrusion and the second protrusion; part of the third protrusion extends in a second direction away from the screw rod and abuts against a side wall and a bottom wall; the second direction is perpendicular to the first direction, and the second direction is the radial direction of the screw rod; the angle formed by the bottom wall and the inner surface of the side wall is an acute angle; wherein the second housing unit comprises the bottom wall and the side wall, the bottom wall and the side wall are connected and form the sealing groove, and the bottom wall abuts against the side of the sealing element away from the nut.

4. The high-sealing steering system according to claim 2, wherein the sealing element further comprises a third protrusion integrally formed with the sealing body, the first protrusion and the second protrusion; the third protrusion extends in a second direction away from the screw rod and abuts against a side wall and a bottom wall; the second direction is perpendicular to the first direction; the bottom wall is arranged perpendicular to the side wall, part of the third protrusion abuts against the bottom wall and the side wall respectively, and the other part of the third protrusion has a third gap with the side wall. The second shell unit is provided with the bottom wall and the side wall, the bottom wall and the side wall are connected and form the sealing groove, and the bottom wall abuts against the side of the sealing element away from the nut.

5. The high-sealing steering system according to claim 4, wherein, In the compressed state, the maximum value of the third gap is less than the maximum value of the first gap.

6. The high-sealing steering system according to any one of claims 3-5, wherein, In the compressed state, the nut abuts against the second shell unit and part of the second protrusion respectively; the abutting surface of the second shell unit against the nut is a compensation abutting surface; the height of the compensation abutting surface along the first direction to the bottom wall is greater than or equal to the minimum height of the second protrusion along the first direction.

7. The high-sealing steering system according to claim 2, wherein, Further comprising: The second shell unit is provided with a through hole along the axial direction of the screw rod, the screw rod passes through the through hole and is connected with one end of the output shaft; the side of the second shell unit facing the nut is provided with a chamfer groove; the chamfer groove is in communication with the sealing groove; in the compressed state, the first protrusion extends into the chamfer groove.

8. The high-sealing steering system according to claim 1, wherein, Further comprising: A driving assembly is located in the first shell unit; the driving assembly comprises a driving part and a speed reduction part; the driving part is drivingly connected with the speed reduction part; the speed reduction part is drivingly connected with the transmission assembly.

9. The high-sealing steering system according to claim 8, wherein, The transmission assembly comprises a screw rod shaft, a rolling body and a thread nut; the screw rod shaft is drivingly connected with the speed reduction part; the thread nut is sleeved on the screw rod shaft and forms an inner raceway with the screw rod shaft; the rolling body is located in the inner raceway; the screw rod shaft drives the thread nut to move along the axial direction of the screw rod shaft through the rolling body.

10. The high-sealing steering system according to claim 9, wherein, The tooth fan is drivingly connected with the thread nut, and the thread nut drives the tooth fan to rotate along the central axis of the tooth fan.

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