CN120986529A

CN120986529A - A high-sealing steering system

Info

Publication number: CN120986529A
Application number: CN202511500569.9A
Authority: CN
Inventors: 陈锋; 袁振涛; 章炬辉; 邱宝象; 斯陈锋; 温选辉
Original assignee: Zhejiang Wan'an Zhiqu Automotive Electronic Technology Co ltd; Zhejiang VIE Science and Technology Co Ltd
Current assignee: Zhejiang Wan'an Zhiqu Automotive Electronic Technology Co ltd; Zhejiang VIE Science and Technology Co Ltd
Priority date: 2025-10-21
Filing date: 2025-10-21
Publication date: 2025-11-21
Anticipated expiration: 2045-10-21
Also published as: CN120986529B

Abstract

The invention relates to the technical field of vehicle steering, in particular to a high-sealing steering system which comprises a shell component, a transmission component and an output component, wherein the transmission component and the output component are arranged in the shell component, the output component comprises an output unit and a compensation unit, the output unit comprises a toothed sector and an output shaft, the transmission component is in driving connection with the toothed sector and the output shaft, the compensation unit comprises a screw rod connected with the output shaft, a nut and a sealing element, the nut is sleeved on the screw rod, the shell component is provided with a sealing groove, the sealing element is positioned in the sealing groove, the sealing element comprises a sealing body, a first bulge and a second bulge, the first bulge extends towards a first direction, part of the first bulge is abutted against the screw rod and the second shell component, the other part of the first bulge is in 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 bulge extends towards the nut, and the second bulge is abutted against the nut and extends to the first gap in a compression state. The problem of traditional sealing washer and sealing effect relatively poor between adjusting screw and the lock nut has been solved.

Description

Steering system with high sealing performance

Technical Field

The invention relates to the technical field of vehicle steering, in particular to a high-sealing steering system.

Background

In a steering system of an automobile, in order to eliminate a gap between a gear sector and a gear nut (or a rack) during meshing transmission and ensure stability and accuracy of steering force transmission, an elastic compensation mechanism is usually arranged at one axial end of an output shaft. The mechanism generally comprises a spring, an adjusting screw, a lock nut and other parts, and the output shaft and a sector on the output shaft are forced to generate a trace of axial movement by the pretightening force of the spring, so that the sector and a tooth nut always keep a gapless tight meshing state, and the design is important for improving steering feel and system durability.

The steering system shell is filled with lubricating oil. In order to ensure the tightness of the shell, a sealing ring is usually added between the shell and the adjusting screw and the locking nut, but the traditional sealing ring is difficult to realize tight fit with the adjusting screw and the locking nut, so that the shell filled with lubricating oil liquid is extremely easy to leak outwards along the thread gap of the locking screw under the pressure generated by stirring of a gear and temperature change. In order to solve the leakage problem, the inner diameter of the sealing ring is selected to be smaller than the outer diameter of the adjusting screw, but the adjusting screw and the locking nut are difficult to adjust in position by the method. Therefore, a steering system with high sealing performance is needed at present, and the problems that the sealing effect between the traditional sealing ring and the adjusting screw and the locking nut is poor, and the positions between the traditional sealing ring and the adjusting screw and the locking nut are difficult to adjust after sealing are solved.

Disclosure of Invention

In order to solve the problems that the sealing effect between the traditional sealing ring and the adjusting screw and the locking nut is poor and the position between the traditional sealing ring and the adjusting screw is difficult to adjust after sealing, the invention provides a high-sealing steering system, which comprises:

The shell assembly comprises a first shell unit and a second shell unit which are sequentially connected, and the transmission assembly is arranged in the first shell unit;

The output assembly is arranged in the second shell unit;

The output assembly comprises an output unit and a compensation unit, wherein the output unit comprises a toothed sector and an output shaft which are integrally formed, the toothed sector is driven by the transmission assembly to drive the output shaft to axially move, the compensation unit comprises a screw, a nut and a sealing element, the screw penetrates through one side of the second shell unit and is connected with one end of the output shaft, the nut is sleeved on the screw and is positioned on one side, far away from the output shaft, of the second shell unit, a sealing groove is formed in one side, close to the nut, of the second shell unit, and the sealing element is positioned in the sealing groove and sleeved on the outer peripheral side of the screw;

The sealing element comprises a sealing body, a first bulge and a second bulge which are integrally formed, wherein the first bulge extends along one side of the sealing body in a first direction, part of the first bulge is abutted against the screw rod and the second shell unit, the other part of the first bulge is provided with 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 bulge extends from one side of the sealing body to the nut, and in a compression state, part of the second bulge is abutted against the nut and extends to the first gap.

In some embodiments, in the compressed state, the second protrusion is subjected to pressure in a first direction, the first direction being a central axis of the screw, a portion of the second protrusion abutting the nut and extending to the first gap, and another portion of the second protrusion having a second gap with the nut.

In some embodiments, the seal further comprises a third protrusion integrally formed with the seal body, the first protrusion and the second protrusion, a portion of the third protrusion extending in a second direction toward a side away from the screw and abutting the side wall and the bottom wall, the second direction being perpendicular to the first direction, the second direction being radial to the screw, the bottom wall intersecting the inner surface of the side wall at an acute angle;

the second shell 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 is abutted with one side, far away from the nut, of the sealing piece.

In some embodiments, the seal further comprises a third protrusion integrally formed with the seal body, the first protrusion and the second protrusion, the third protrusion extending in a second direction toward a side away from the screw and abutting the side wall and the bottom wall, the second direction being mutually perpendicular to the first direction;

The second shell unit is provided with 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 is abutted with one side, far away from the nut, of the sealing piece.

In some embodiments, in the compacted state, the maximum value of the third interval is less than the maximum value of the first interval.

In some embodiments, in the compressed state, the nut is respectively abutted with the second shell unit and part of the second protrusion, the abutting surface of the second shell unit and the nut is a compensation abutting surface, and the height of the compensation abutting surface from the first direction to the bottom wall is greater than or equal to the minimum height of the second protrusion in the first direction.

In some embodiments, the high seal steering system further comprises:

the second shell unit is provided with a through hole along the axial direction of the screw rod, the screw rod penetrates through the through hole and is connected with one end of the output shaft, one side of the second shell unit, facing the nut, is provided with a chamfer groove, the chamfer groove is communicated with the sealing groove, and the second bulge extends into the chamfer groove in a compression state.

In some embodiments, the high seal steering system further comprises:

The driving assembly is positioned in the first shell unit and comprises a driving part and a speed reduction part, wherein the driving part is in driving connection with the speed reduction part, and the speed reduction part is in driving connection with the transmission assembly.

In some embodiments, the transmission assembly comprises a screw shaft, rolling bodies and a tooth screw, wherein the screw shaft is in driving connection with the speed reduction part, the tooth screw is sleeved on the screw shaft and forms an inner raceway with the screw shaft, the rolling bodies are positioned in the inner raceway, and the screw shaft drives the tooth screw to move along the axial direction of the screw shaft through the rolling bodies.

In some embodiments, the sector is drivingly connected to a tooth nut that drives the sector in rotation along a central axis of the sector.

In order to solve the problems that the sealing effect between the traditional sealing ring and the adjusting screw and the locking nut is poor and the position between the traditional sealing ring, the adjusting screw and the locking nut is difficult to adjust after sealing, the invention has the following advantages:

The sealing element is provided with the special sealing structure with the first bulge and the second bulge which are integrally formed, and deformation direction of the sealing element can be effectively guided when the nut is pressed, so that tightness of the shell assembly is guaranteed. The second bulge extends towards the direction of the screw rod after being extruded and enters a first gap between the first bulge and the screw rod, so that the phenomenon that a part of sealing element is extruded into the abutting surface of the nut and the second shell unit to damage the sealing is avoided, the minimum inner diameter of the sealing element is smaller than the maximum outer diameter of the screw rod, the radial enclasping force of the sealing element on the screw rod is enhanced, and the overall static and dynamic sealing performance is remarkably improved.

Meanwhile, the preset structure of the first gap provides space for elastic recovery of the sealing element after the nut is loosened, so that friction resistance between the sealing element and the surface of the screw is greatly reduced, later operation is more labor-saving and flexible when the position of the screw is corrected and adjusted, and sealing reliability and adjustment convenience are unified.

Drawings

FIG. 1 illustrates a cross-sectional view of a portion of a drive assembly and a transmission assembly in a highly sealed steering system in accordance with one embodiment;

FIG. 2 illustrates a schematic structural view of an embodiment high seal steering system;

FIG. 3 illustrates another structural schematic of an embodiment high seal steering system;

FIG. 4 illustrates a cross-sectional view of an embodiment high seal steering system;

FIG. 5 illustrates a cross-sectional view of an embodiment of a high seal steering system;

FIG. 6 illustrates a seal block diagram of an embodiment high seal steering system;

FIG. 7 illustrates a B-B cross-sectional view of an embodiment high seal steering system;

FIG. 8 illustrates a close-up view of C in FIG. 5 in an embodiment of a highly sealed steering system;

FIG. 9 illustrates a partial view of an embodiment high seal steering system without the seal loaded on the basis of FIG. 8;

Fig. 10 shows a partial view of the non-load bearing seal of fig. 8 in another embodiment high seal steering system.

Reference numerals:

10. The housing assembly, 11, the first housing unit, 12, the second housing unit, 121, the output end housing, 122, the support end housing, 1221, the connecting screw, 1222, the chamfer groove, 1223, the seal groove, 1224, the bottom wall, 1225, the side wall, 1226, the compensation abutting surface, 20, the driving assembly, 21, the driving part, 22, the speed reducing part, 30, the transmission assembly, 31, the screw shaft, 32, the tooth nut, 40, the output assembly, 41, the output unit, 411, the tooth fan, 412, the output shaft, 42, the compensation unit, 421, the screw, 422, the nut, 423, the sealing member, 4231, the sealing body, 4232, the first protrusion, 4233, the second protrusion, 4234, the third protrusion.

Detailed Description

The disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those of ordinary skill in the art to better understand and thus practice the present disclosure, and are not meant to imply any limitation on the scope of the present disclosure.

As used herein, the term "comprising" and variants thereof are to be interpreted as meaning "including but not limited to" open-ended terms. The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment. The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "transverse", "longitudinal", etc. refer to an orientation or positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present invention will be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, they may be fixedly connected, detachably connected, or of unitary construction, they may be mechanically or electrically connected, they may be directly connected, or they may be indirectly connected through intermediaries, or they may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.

The steering system of a vehicle is a core component of the chassis system, and its function is to reliably transfer the steering intention of the driver to the wheels, directly related to the driving safety and handling experience. The long-lasting reliability of a vehicle steering system is closely related to the effective lubrication of its internal transmission components. In order to reduce the abrasion of key kinematic pairs such as a sector and a bearing, reduce running noise and improve transmission efficiency, special lubricating oil or lubricating grease needs to be filled in a steering gear shell to form a long-acting lubricating environment. In order to eliminate the clearance between the tooth sector and the tooth nut (or the rack) during the meshing transmission, an elastic compensation mechanism is usually arranged at one axial end of the output shaft, and a sealing ring is adopted to ensure the tightness in the related art, but the sealing ring has poor effect, so that lubricating oil or lubricating grease leaks, and the inner diameter of the sealing ring is reduced to ensure the sealing effect, so that the position of the elastic compensation mechanism is difficult to adjust.

Therefore, the invention provides a steering system with high sealing, which can solve the problems that the sealing effect between the traditional sealing ring and the adjusting screw and the locking nut is poor, and the positions among the traditional sealing ring, the adjusting screw and the locking nut are difficult to adjust after sealing.

Example 1

Referring to fig. 1,2 and 3, the present embodiment provides a high-sealing steering system, which includes:

The shell assembly 10 comprises a first shell unit 11 and a second shell unit 12 which are sequentially connected, 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, and lubricating oil or lubricating grease is filled in the shell assembly 10, so that a long-acting lubricating environment is ensured inside the shell assembly 10.

Further, the driving assembly 20 comprises a driving part 21 and a speed reduction part 22, the driving part 21 is in driving connection with the speed reduction part 22, the driving part 21 provides power for the speed reduction part 22, and the speed reduction part 22 is in driving connection with the transmission assembly 30, wherein the driving part 21 can be a motor.

Further, referring to fig. 4, the transmission assembly 30 includes a screw shaft 31, a rolling element (not shown) and a tooth nut 32, wherein the screw shaft 31 is in driving connection with the reduction gear 22, i.e. the motor drives the reduction gear 22, the reduction gear 22 may include a worm and a worm wheel, and the reduction gear 22 drives the screw shaft 31 to rotate. The gear nut 32 is sleeved on the screw rod shaft 31 and forms an inner raceway with the screw rod shaft 31, the rolling body is positioned in the inner raceway and rolls in the inner raceway, and the rolling body converts sliding friction between the screw rod shaft 31 and the gear nut 32 into rolling friction, so that abrasion among the screw rod shaft 31 and the gear nut is effectively reduced. The screw shaft 31 drives the gear nut 32 by the rolling bodies to move in the axial direction of the screw shaft 31, and converts the rotation of the screw shaft 31 into the axial movement of the gear nut 32 in the axial direction of the screw shaft 31.

In this embodiment, please refer to fig. 4 and 5, the output assembly 40 includes an output unit 41 and a compensation unit 42, the output unit 41 includes an integrally formed gear sector 411 and an output shaft 412, the gear sector 411 is in driving connection with the gear nut 32, the gear nut 32 drives the gear sector 411 to rotate along the central axis of the gear sector 411, the gear sector 411 drives the output shaft 412 to axially move, abrasion between the screw shaft 31 and the gear nut 32 is reduced, transmission efficiency is improved, and meanwhile steering precision of the steering mechanism can be controlled through a motor.

In the present embodiment, referring to fig. 1 and 5, the compensation unit 42 includes a screw 421, a nut 422, and a sealing member 423, and the screw 421 penetrates through one side of the second housing unit 12 and is connected to one end of the output shaft 412.

Specifically, the second shell unit 12 may further include an output end housing 121 and a support end housing 122 that are connected, where the support end housing 122 seals the output end housing 121, a cavity is formed inside the two, and the cavity is filled with lubricating oil or grease, and the output assembly 40 is detachably disposed in the cavity formed by the support end housing 122 and the output end housing 121. One end of the screw 421 penetrates through one side of the support end housing 122 and is connected with one end of the output shaft 412, one end of the output shaft 412 is connected with the screw 421, the other end penetrates through the output end housing 121, and a portion of the output shaft 412 penetrating through the output end housing 121 can be connected with an external steering linkage mechanism, specifically, according to practical application.

In this embodiment, referring to fig. 5, 6 and 7, the nut 422 is sleeved on the screw 421, and the nut 422 is located on one side of the supporting end housing 122 away from the output shaft 412, and a sealing groove 1223 is formed on one side of the supporting end housing 122 close to the nut 422, and the sealing member 423 is located in the sealing groove 1223 and sleeved on the outer peripheral side of the screw 421, for sealing the gaps between the screw 421, the nut 422 and the supporting end housing 122, preventing leakage of lubricating oil or grease or preventing external dust or impurities from entering between the cavity and the part gap.

In the present embodiment, the sealing member 423 is annular, and is specifically based on practical use. The seal 423 includes a seal body 4231, a first protrusion 4232 and a second protrusion 4233 integrally formed, wherein the first protrusion 4232 extends along one side of the seal body 4231 in a first direction, the first direction is a central axis of the screw 421, part of the first protrusion 4232 abuts against the screw 421 and the support end housing 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, and the second protrusion 4233 extends from one side of the sealing body 4231 toward the nut 422, and in a compressed state, a portion of the second protrusion 4233 is pressed against the nut 422 and extends to the first gap.

It can be appreciated that the portion of the first protrusion 4232 abuts against the screw 421 and the supporting end housing 122, and the minimum inner diameter of the sealing member 423 is smaller than the maximum outer diameter of the screw 421, so that the radial holding force of the sealing member 423 and the screw 421 can be effectively increased, the tightness is ensured, the leakage of lubricating fluid or grease from the gap between the screw 421 and the supporting end housing 122 is prevented, and the overall static and dynamic sealing performance is remarkably improved.

Further, the first protrusions 4232 and the second protrusions 4233 can effectively guide the deformation direction of the sealing member 423 when the nut 422 is pressed toward the support end housing 122. In the compressed state, the part of the second protrusion 4233 is pressed against the nut 422 and extends to the first gap, so that the part of the sealing member 423 is prevented from being pressed into the contact surface between the nut 422 and the support end housing 122 to break the seal. And based on the preset structure of the first gap, an elastic restoring space is provided for adjusting the position of the nut 422 or the screw 421, so that the friction resistance between the sealing element 423 and the surface of the screw 421 is greatly reduced, and the efficiency of correcting the positions of the nut 422 and the screw 421 in the later stage is improved.

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

It will be appreciated that the seal 423 includes a compressed state in which a portion of the second protrusion 4233 extends toward the nut 422 and another portion of the second protrusion 4233 has a second gap with the nut 422 to prevent the second protrusion 4233 from being pressed into the compensating abutment surface 1226 of the nut 422 and the support end housing 122 to break the seal, and an installed state in which the second protrusion 4233 is pressed by the nut 422 toward the support end housing 122 and a portion of the second protrusion 4233 abuts the nut 422 and extends to the first gap and another portion of the second protrusion 4233 still has a second gap with the nut 422 to ensure that the second protrusion 4233 is pressed into the compensating abutment surface 1226 of the nut 422 and the support end housing 122 to break the seal.

In this embodiment, referring to fig. 5, 6, 7, 8 and 9, the sealing member 423 further includes a third protrusion 4234, where the third protrusion 4234 is integrally formed with the sealing body 4231, the first protrusion 4232 and the second protrusion 4233, and a portion of the third protrusion 4234 extends along a second direction toward a side away from the screw 421 and abuts against the side wall 1225 and the bottom wall 1224, wherein the second direction is perpendicular to the first direction, and the second direction is a radial direction of the screw 421;

wherein, support end housing 122 includes a bottom wall 1224 and a side wall 1225, bottom wall 1224 and side wall 1225 are connected and form a seal groove 1223, bottom wall 1224 abuts a side of seal 423 remote from nut 422.

In this embodiment, the angle formed by the intersection of the bottom wall 1224 and the inner surface of the side wall 1225 is an acute angle, the third protrusion 4234 is adapted to extend from the acute angle to the side away from the screw 421 along the second direction and is abutted against the side wall 1225 and the bottom wall 1224, and part of the third protrusion 4234 is tightly attached to the side wall 1225 and the bottom wall 1224, and 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, so as to realize sealing.

Further, in the compressed state, the nut 422 is respectively abutted against the supporting end housing 122 and a part of the second protrusion 4233, the surface of the supporting end housing 122 abutted against the nut 422 is a compensation abutment surface 1226, and the height from the compensation abutment surface 1226 to the bottom wall 1224 along the first direction is greater than or equal to the minimum height of the second protrusion 4233 along the first direction.

It can be appreciated that, in order to prevent a portion of the second protrusion 4233 from entering between the nut 422 and the compensation abutment surface 1226 of the support end housing 122, the height of the bottom wall 1224 is set to be equal to or greater than the minimum height of the second protrusion 4233 along the first direction, so that the second protrusion 4233 can change deformation when receiving the force of the nut 422 in the direction of the support end housing 122, and extend toward the gap formed by the height difference between the two or toward the first gap, thereby avoiding the gap between the nut 422 and the compensation abutment surface 1226 of the support end housing 122 and affecting the tightness.

Further, the highly sealed steering system further includes:

The second housing unit 12 is provided with a through hole in an axial direction of the screw 421, the screw 421 passes through the through hole and is connected to one end of the output shaft 412, a chamfer groove 1222 is provided on a side of the second housing unit 12 facing the nut 422, the chamfer groove 1222 communicates with the seal groove 1223, and the second boss 4233 extends into the chamfer groove 1222 in a compressed state.

Specifically, the support end housing 122 of the second housing unit 12 is provided therein with a connecting screw 1221, and the screw 421 passes through the through-hole and is screwed with the support end housing 122 by the connecting screw 1221. In the compressed state, the second protrusions 4233 extend into the chamfer grooves 1222 to further prevent leakage of the lubricating fluid or grease.

Example two

The present embodiment provides a highly sealed steering system, which has the same structure and connection manner as those of the first embodiment, and includes a housing assembly 10, a driving assembly 20, a transmission assembly 30, and an output unit 41 of the output assembly 40, so that details thereof are not repeated in the present embodiment, and reference may be made to the first embodiment. The difference is that in the present embodiment, referring to fig. 10, the seal 423 further includes a third protrusion 4234, the third protrusion 4234 is integrally formed with the seal body 4231, the first protrusion 4232 and the second protrusion 4233, the third protrusion 4234 extends along a second direction to a side far from the screw 421 and abuts against the side wall 1225, the second direction is perpendicular to the first direction, the bottom wall 1224 is disposed opposite to the side wall 1225, a part of the third protrusion 4234 abuts against the bottom wall 1224 and the side wall 1225, and another part of the third protrusion 4234 has a third interval with the side wall 1225;

wherein the second housing 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 a side of the sealing member 423 away from the nut 422.

Further, in the compressed state, the maximum value of the third interval is smaller than the maximum value of the first interval.

Specifically, the bottom wall 1224 and the side wall 1225 are relatively vertically disposed, and a portion of the third protrusion 4234 is respectively abutted against the bottom wall 1224 and the side wall 1225, so that a portion of the third protrusion 4234 is abutted against the vertically disposed bottom wall 1224 and the side wall 1225 to form a closer fit, so that the lubricating oil or grease is more difficult to leak than the sealing ring in the related art, and sealing is achieved. While a portion of the third protrusions 4234 that do not abut the bottom wall 1224 and the side wall 1225 form a third space with the side wall 1225, the pressed second protrusions 4233 may enter the first space, the second space, and/or the third space, preventing a portion of the second protrusions 4233 from entering between the nut 422 and the compensating abutment surface 1226 of the support end housing 122 to the greatest extent, ensuring a seal.

Embodiment III:

The embodiment provides a high-sealing steering method based on the high-sealing steering system provided in the first embodiment and the second embodiment, which comprises the following steps:

Screw 421 is passed through the through-hole and screwed with support end housing 122 by connecting screw 1221, nut 422 is fitted over screw 421, and seal 423 is placed in seal groove 1223 and screwed onto screw 421. The nut 422 is tightened such that the seal 423 is compressed, the first boss 4232 extends in a first direction and abuts the screw 421 and the bottom wall 1224, which may extend into the chamfer groove 1222, the second boss 4233 abuts the nut 422 and may extend toward the first and second gaps, and the third boss 4234 abuts the bottom wall 1224 and the side wall 1225.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of implementing the disclosure, and that various changes in form and details may be made therein without departing from the scope of the disclosure.

Claims

1. A high seal steering system, the high seal steering system comprising:

The output assembly is arranged in the second shell unit and comprises an output unit and a compensation unit, the output unit comprises a toothed sector and an output shaft which are integrally formed, the transmission assembly drives the toothed sector, the toothed sector drives the output shaft to axially move, the compensation unit comprises a screw rod, a nut and a sealing piece, the screw rod penetrates through one side of the second shell unit and is connected with one end of the output shaft, the nut is sleeved on the screw rod and is positioned on one side, far away from the output shaft, of the second shell unit, a sealing groove is formed in one side, close to the nut, of the second shell unit, the sealing piece is positioned in the sealing groove and is sleeved on the outer peripheral side of the screw rod, and the sealing piece is annular;

The sealing element comprises a sealing body, a first bulge and a second bulge which are integrally formed, wherein the first bulge extends along one side of the sealing body in a first direction, part of the first bulge is abutted against the screw rod and the second shell unit, the other part of the first bulge is provided with 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 bulge extends from one side of the sealing body to the nut, and in a compression state, part of the second bulge is pressed to be abutted against the nut and extend to the first gap.

2. A highly sealed steering system according to claim 1, wherein,

In the compressed state, the second protrusion receives pressure along a first direction, the first direction is the central axis of the screw rod, part of the second protrusion is abutted with the nut and extends to the first gap, and the other part of the second protrusion is provided with a second gap with the nut.

3. A highly sealed steering system according to claim 2, wherein,

The sealing piece further comprises a third bulge, a part of the third bulge extends along a second direction towards one side far away from the screw rod and is abutted against the side wall and the bottom wall, the second direction is perpendicular to the first direction, the second direction is radial of the screw rod, and an angle formed by intersecting the bottom wall and the inner surface of the side wall is an acute angle;

The second shell unit comprises a bottom wall and a side wall, the bottom wall and the side wall are connected and form the sealing groove, and the bottom wall is abutted with one side, away from the nut, of the sealing piece.

4. A highly sealed steering system according to claim 2, wherein,

The sealing piece further comprises a third bulge, wherein the third bulge is integrally formed with the sealing body, the first bulge and the second bulge, extends along a second direction to one side far away from the screw rod and is abutted against the side wall and the bottom wall, the second direction is mutually perpendicular to the first direction, the bottom wall is relatively and vertically arranged with the side wall, part of the third bulge is abutted against the bottom wall and the side wall respectively, and the other part of the third bulge is spaced from the side wall by a third interval;

The second shell unit is provided with a bottom wall and a side wall, the bottom wall and the side wall are connected and form the sealing groove, and the bottom wall is abutted with one side, away from the nut, of the sealing piece.

5. A highly sealed steering system according to claim 4, wherein,

In the compressed state, the maximum value of the third interval is smaller than the maximum value of the first interval.

6. A highly sealed steering system according to any one of claims 3 to 5, wherein,

In the compressed state, the nut is respectively abutted with the second shell unit and part of the second bulge, the abutting surface of the second shell unit and the nut is a compensation abutting surface, and the height from the compensation abutting surface to the bottom wall along the first direction is greater than or equal to the minimum height of the second bulge along the first direction.

7. A highly sealed steering system according to claim 2, wherein,

Further comprises:

The second shell unit is provided with a through hole along the axial direction of the screw rod, the screw rod penetrates through the through hole and is connected with one end of the output shaft, one side, facing the nut, of the second shell unit is provided with a chamfer groove, the chamfer groove is communicated with the sealing groove, and in the compression state, the second protrusion extends into the chamfer groove.

8. A highly sealed steering system according to claim 1, wherein,

Further comprises:

9. A highly sealed steering system according to claim 8, wherein,

The transmission assembly comprises a screw rod shaft, rolling bodies and a tooth screw nut, wherein the screw rod shaft is in driving connection with the speed reduction part, the tooth screw nut is sleeved on the screw rod shaft and forms an inner raceway with the screw rod shaft, the rolling bodies are located in the inner raceway, and the screw rod shaft drives the tooth screw nut to move along the axial direction of the screw rod shaft through the rolling bodies.

10. A highly sealed steering system according to claim 9, wherein,

The tooth sector is in driving connection with the tooth screw, and the tooth screw drives the tooth sector rotates along the central axis of the tooth sector.