CN219565225U - Power steering device - Google Patents

Abstract

The utility model discloses a power steering gear, comprising: a housing; the power-assisted driving structure is arranged on the shell; the power-assisted steering device comprises a shell, a toroidal worm and a rocker arm shaft, wherein the toroidal worm and the rocker arm shaft are both positioned in the shell, the toroidal worm is in power connection with the power-assisted driving structure, the toroidal worm is provided with driving meshing teeth, the rocker arm shaft is adjustable in axial position, the rocker arm shaft is provided with driven teeth which are meshed with the driving teeth for transmission, the driven teeth are in tooth thickness gradual change along the axial direction, and the rocker arm shaft is used for outputting steering torque. The power-assisted steering gear can improve transmission reliability, reduce processing difficulty and assembly requirements of the power-assisted steering gear, save manufacturing cost, adjust meshing gaps of the worn driving teeth and driven teeth, reduce transmission noise, reduce maintenance difficulty, save maintenance time and cost due to simplified structure, and has better use effect and wider application range.

Description

Power steering device

Technical Field

The utility model relates to the technical field of vehicle manufacturing, in particular to a power steering gear.

Background

With the development of intelligent driving in the automobile industry, various vehicles face the trend of electric and intelligent conversion, and steering is an important ring of the intelligent conversion. Because the traditional hydraulic power assisted steering device can not meet the requirement of intelligent driving, the novel electric power assisted circulating ball steering device is complex in structure, huge in size, and mainly applied to light truck types, and does not have economical efficiency, so that the novel electric power assisted circulating ball steering device can be replaced by using the toroidal worm drive power assisted steering device, but the toroidal worm drive power assisted steering device in the current market is subjected to clearance adjustment through an elastomer or a connecting bolt and the like, so that the novel electric power assisted circulating ball steering device is high in failure risk, low in safety, high in processing and manufacturing difficulty, high in cost, difficult in mass production, low in economic benefit, complex in structure, inconvenient to maintain in later period, high in maintenance cost and has an improvement space.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the power steering gear provided by the utility model has the advantages of high transmission reliability, low processing difficulty and assembly requirements, low manufacturing cost, simple structure, low maintenance difficulty and low maintenance time and cost.

A power steering apparatus according to an embodiment of the present utility model includes: a housing; the power-assisted driving structure is arranged on the shell; the power-assisted steering device comprises a shell, a toroidal worm and a rocker arm shaft, wherein the toroidal worm and the rocker arm shaft are both positioned in the shell, the toroidal worm is in power connection with the power-assisted driving structure, the toroidal worm is provided with driving teeth, the rocker arm shaft is adjustable in axial position, the rocker arm shaft is provided with driven teeth which are meshed with the driving teeth for transmission, the driven teeth are in tooth thickness gradual change along the axial direction, and the rocker arm shaft is used for outputting steering torque.

According to the power steering gear disclosed by the embodiment of the utility model, the toroidal worm is in direct contact with the rocker shaft for transmission, the position of the rocker shaft along the axial direction is adjustable, the transmission reliability is improved, the processing difficulty and the assembly requirement of the power steering gear are reduced, the manufacturing cost is saved, the meshing gap between the worn driving teeth and the worn driven teeth can be adjusted, the transmission noise is reduced, meanwhile, the structure is simplified, the maintenance difficulty can be reduced, the maintenance time and cost are saved, the use effect is better, and the application range is wider.

According to the power steering gear of some embodiments of the present utility model, the rocker shaft includes a fan body and a shaft body, the fan body and the shaft body are coaxially disposed, the driven tooth is disposed on the fan body, and the shaft body is used for being in power connection with an external steering structure.

According to the power steering gear of some embodiments of the present utility model, the driven tooth defines a mating tooth shape at the sector, the mating tooth shape is in meshed transmission with the driving tooth, and tooth surfaces of the mating tooth shape include a first tooth surface and a second tooth surface which are distributed oppositely, and a helix angle of the first tooth surface is different from a helix angle of the second tooth surface.

The power steering gear according to some embodiments of the present utility model further includes an adjustment structure mounted to the housing, the adjustment structure including an adjustment member movable relative to the housing for urging the rocker shaft to move in an axial direction.

According to the power steering gear of some embodiments of the present utility model, the rocker shaft is provided with a tail connection portion, the tail connection portion is provided with a receiving cavity, the adjusting piece is configured as an adjusting screw, the adjusting screw penetrates through the shell and is in threaded fit with the shell, one part of the adjusting screw is located in the receiving cavity and is pressed against the rocker shaft, and the other part of the adjusting screw extends out of the shell and is in connection fit with the fastening nut.

A power steering gear according to some embodiments of the present utility model further includes: the screw plug is arranged at the part of the adjusting screw, which is positioned in the accommodating cavity, and is provided with a limiting part, the screw plug is positioned in the accommodating cavity, and the screw plug is in threaded connection with the tail connecting part and is in limiting abutting pressing with the limiting part.

A power steering gear according to some embodiments of the present utility model further includes: and a side cover formed with a side mounting opening, the rocker shaft being adapted to be fitted into the housing from the side mounting opening, the side cover being detachably mounted to the side mounting opening.

According to the power steering gear of some embodiments of the present utility model, the side cover is provided with a support boss that is supported on an inner peripheral wall of the side mounting port and is in sealing engagement with the housing.

A power steering gear according to some embodiments of the present utility model further includes: the power assisting device comprises an input structure and a detection element, wherein the input structure comprises an input shaft and a torsion bar, one end of the torsion bar is connected with the end part of the annular worm, the input shaft is sleeved outside the torsion bar and circumferentially fixed with the other end of the torsion bar, the detection element is used for detecting the deformation state of the torsion bar when the input shaft inputs power, and the power assisting driving structure is used for outputting steering power according to the deformation state.

According to the power steering gear of some embodiments of the present utility model, the detecting element includes a magnetic ring, a stator and a rotor, the magnetic ring is disposed on the input shaft, the rotor is disposed on the torus worm, the stator is connected with a fixing block, the fixing block is formed with a waist-shaped hole, and the fixing block is disposed on the housing through the waist-shaped hole.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a cross-sectional view of a power steering gear in accordance with an embodiment of the present utility model;

FIG. 2 is a second cross-sectional view of a power steering gear in accordance with an embodiment of the present utility model;

FIG. 3 is an exploded view of a power steering gear according to an embodiment of the present utility model;

FIG. 4 is a schematic structural view of a rocker shaft according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a mating tooth form according to an embodiment of the present utility model;

FIG. 6 is a partial cross-sectional view of a power steering gear according to an embodiment of the utility model;

FIG. 7 is a schematic view of a structure of a fixing block according to an embodiment of the present utility model;

fig. 8 is a schematic structural view of a power steering gear according to an embodiment of the present utility model.

Reference numerals:

the power steering gear 100 is configured to provide a torque,

the device comprises a shell 1, an adjusting screw 11, a limiting part 111, a fastening nut 12, a screw plug 13, a side cover 14, a supporting boss 141, a power-assisted driving structure 2, a worm 21, a worm wheel 22, a motor controller 23, a toroidal worm 3, a driving tooth 31, a fixed block 32, a waist-shaped hole 321,

rocker shaft 4, shaft body 41, sector 42, driven tooth 421, mating tooth 422, first side 4221, second side 4222, trailing attachment 43, receiving cavity 431,

the input structure 5, the input shaft 51, the torsion bar 52, the detecting element 6, the thrust ball bearing 71, the bolt 72, the cylindrical pin 73, the o-ring 74, the seal groove 75, the oil seal 76, the deep groove ball bearing 77, the sliding bearing 78, the lock nut 79, the adjusting body 81, the tapered roller bearing 82, the needle bearing 83 and the stator 84.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The power steering apparatus 100 according to the embodiment of the present utility model is described below with reference to fig. 1 to 8, and has the advantages of high transmission reliability, low processing difficulty and assembly requirements, low manufacturing cost, simple structure, low maintenance difficulty, and low maintenance time and cost.

As shown in fig. 1 to 8, a power steering gear 100 according to an embodiment of the present utility model includes: a housing 1, a booster drive structure 2, a torus worm 3 and a rocker shaft 4.

The power-assisted driving structure 2 is arranged in the shell 1, the toroidal worm 3 and the rocker shaft 4 are both positioned in the shell 1, the toroidal worm 3 is in power connection with the power-assisted driving structure 2, the toroidal worm 3 is provided with driving teeth 31, the position of the rocker shaft 4 along the axial direction is adjustable, the rocker shaft 4 is provided with driven teeth 421 which are in meshed transmission with the driving teeth 31, the driven teeth 421 are configured to gradually change in tooth thickness along the axial direction, and the rocker shaft 4 is used for outputting steering torque.

The power steering device 100 may provide a power steering function for a vehicle, and is internally provided with an input structure 5, a controller, a detection element 6, a power driving structure 2, a worm wheel 22, a worm 21, a torus worm 3, a rocker shaft 4, and the like, and external torque generates an angle difference through the input structure 5, and the detection element 6 may detect the angle difference. The power-assisted driving structure 2 responds to the detection result and outputs corresponding power-assisted torque, the power-assisted torque is transmitted to the torus worm 3 after being decelerated and torque-increased through the worm wheel 22 and the worm 21, then is transmitted to the rocker shaft 4 through the torus worm 3, and is converted into torque through the output end of the rocker shaft 4, so that the power-assisted steering of the vehicle is completed.

Specifically, the power-assisted steering device 100 is provided with a housing 1, the housing 1 is divided into a main housing, a secondary housing and a side cover, the structures such as a torus worm 3 and a rocker shaft 4 are arranged in the main housing, the structures such as the worm 21 and a worm wheel 22 are arranged in the secondary housing, and the main housing, the secondary housing and the side cover 14 are connected through connecting pieces such as bolts 72, so that the power-assisted steering device 100 is convenient to detach, the internal structure is easy to replace and convenient to maintain, the torus worm 3 and the rocker shaft 4 are arranged in the main housing, the power-assisted driving structure 2 is arranged in the secondary housing, the above structures run in relatively closed environments, the reliability of running is guaranteed, the power-assisted driving structure 2 can output power-assisted torque, the power-assisted torque is in power connection with the torus worm 3, the torus worm 3 is provided with a driving tooth 31, the rocker shaft 4 is provided with a driven tooth 421, the driving tooth 31 and the driven tooth 421 can be mutually matched for meshed transmission, the driven tooth 421 can be gradually changed in the axial direction by the driving tooth 31 arranged on the torus worm 3 and the rocker shaft 4, the driven tooth 421 can be gradually changed in the tooth surface 421 is also arranged in the axial direction, and the toroidal surface 421 can be axially changed in the shape of the enveloping structure, namely, the toroidal surface can be changed in the enveloping structure is formed into the plane, and the toroidal surface 4 is also changed in the shape of the enveloping structure, and the toroidal surface can be deformed into the toroidal surface 4.

Therefore, the driven tooth 421 with variable tooth thickness is meshed with the driving tooth 31 to realize the transmission fit of the toroidal worm 3 and the rocker shaft 4, so that the meshing tooth number between the driven tooth 421 and the rocker shaft 4 is increased, the bearing capacity of the power transmission position of the toroidal worm 3 and the rocker shaft 4 is improved, the rocker shaft 4 is arranged to be adjustable along the axial position, the rocker shaft 4 and the toroidal worm 3 can be relatively close to or far away from each other at the matching position, if the gap between the driven tooth 421 and the driving tooth 31 is overlarge or compact, the position of the rocker shaft 4 is flexibly adjusted, axial displacement is realized, the meshing gap of the toroidal worm with variable tooth thickness is effectively adjusted, especially when the meshing position between the driven tooth 421 and the driving tooth 31 is worn greatly, the matching gap generated by wear is actively compensated, the reliability of transmission is ensured, the transmission precision of the toroidal worm 3 is further improved, the rocker shaft 4 and the toroidal worm 3 can be processed by a simple method, the machining precision is high, the machining cost is reduced, and the production efficiency is improved.

According to the power steering gear 100 disclosed by the embodiment of the utility model, the toroidal worm 3 is in direct contact with the rocker shaft 4 for transmission, the position of the rocker shaft 4 along the axial direction is adjustable, the transmission reliability is improved, the processing difficulty and the assembly requirement of the power steering gear 100 are reduced, the manufacturing cost is saved, meanwhile, the structure is simplified, the maintenance difficulty is reduced, the maintenance time and the cost are saved, the use effect is better, and the application range is wider.

In some embodiments, as shown in fig. 1-2, the rocker shaft 4 includes a fan 42 and a shaft 41, the fan 42 and the shaft 41 being coaxially disposed, and the driven teeth 421 are provided on the fan 42, the shaft 41 being for power connection with an external steering structure.

Specifically, the assistance torque is transmitted to the driven tooth 421 arranged on the rocker shaft 4 through the driving tooth 31 arranged on the torus worm 3, the rocker shaft 4 comprises a fan body 42 and a shaft body 41, the driven tooth 421 is arranged on the fan body 42, namely, the assistance torque is transmitted to the driven tooth 421 arranged on the fan body 42 of the rocker shaft 4 through the driving tooth 31 arranged on the torus worm 3, one end of the shaft body 41 is coaxially arranged with the fan body 42, the other end of the shaft body 41 is in power connection with an external steering structure, the fan body 42 and the shaft body 41 can be fixedly connected in an integrated forming, welding and other modes, after the assistance torque is transmitted to the fan body 42, the fan body 42 drives the shaft body 41 fixedly connected with the fan body 42 to rotate, and then the assistance torque is transmitted to the external steering structure, so that the output shaft and the fan teeth are integrated into a whole, the problems of damage of a connecting piece, connection failure and the like caused by overlarge torque can be avoided, the reliability of transmission is ensured, and meanwhile, the safety can be improved.

In some embodiments, as shown in fig. 1-2, the driven tooth 421 defines a mating tooth profile 422 in the sector, the mating tooth profile 422 is in meshed driving engagement with the driving tooth 31, the tooth surfaces of the mating tooth profile 422 include first and second tooth surfaces that are oppositely disposed, and the helix angle of the first tooth surface is different from the helix angle of the second tooth surface, in this embodiment, the helix angle of the first tooth surface may be set to be greater than the helix angle of the second tooth surface.

Specifically, the driven tooth 421 disposed on the sector 42 is configured to gradually change in tooth thickness along the axial direction, and the tooth surface of the driven tooth 421 may be set to be an involute surface, that is, the annular worm 3 and the rocker shaft 4 are formed with a variable tooth thickness involute sector tooth enveloping annular worm 3 transmission structure, the tooth surface of the driven tooth 421 may also be set to be a plane, that is, the annular worm 3 and the rocker shaft 4 are formed with a variable tooth thickness plane sector tooth enveloping annular worm 3 transmission structure, and various setting manners may satisfy different requirements of users, in this embodiment, the driven tooth 421 is set to be an involute sector tooth.

Further, the driving teeth 31 are disposed in the middle area of the torus worm 3, the driven teeth 421 are also disposed in the middle position of the upper end of the fan body 42, and the variable tooth thickness involute fan tooth envelopes the transmission structure of the torus worm 3, so that the number of teeth of the driving teeth 31 and the driven teeth 421 are more, the bearing capacity is higher, and simultaneously, the torus worm 3 with the driving teeth 31 and the fan body 42 with the driven teeth 421 can be processed through grinding teeth, so that the manufacturing is simple, the processing manufacturability is good, and the manufacturing precision is high.

In some embodiments, as shown in fig. 2-3 and 6, the power steering gear 100 further includes an adjusting structure, where the adjusting structure is mounted on the housing 1, the adjusting structure includes an adjusting member that is movable relative to the housing 1, the adjusting member is used to push the rocker shaft 4 to move along an axial direction, the adjusting member is configured as a columnar structure, one end of the adjusting member is connected to the shaft portion 41 of the rocker shaft 4, the other end of the adjusting member is penetrating the housing 1 through an adjusting member mounting hole provided in the housing 1 and extends out of the housing 1, the adjusting member is movable relative to the housing 1, an axis of the adjusting member is located in a same line with an axis of the shaft portion 41 of the rocker shaft 4, when the sector 42 of the rocker shaft 4 is meshed with the driving tooth 31 of the worm 3 through the driven tooth 421, a relative position of the sector 42 of the rocker shaft 4 along the axis can be adjusted through the adjusting member, so that the meshing position of the driving tooth 31 and the driven tooth 421 can be adjusted, so that the meshing is more accurate, the transmission is more stable, and simultaneously, the tooth thickness of the sector 42 can be changed along the axial direction, the meshing distance of the variable tooth sector enveloping the transmission structure can be adjusted, and the following wear of the driven tooth 421 can be compensated.

In some embodiments, the rocker shaft 4 is provided with a tail connection portion 43, the tail connection portion 43 is provided with a receiving cavity 431, the adjusting member is configured as an adjusting screw 11, the adjusting screw 11 is arranged through the housing 1 and is in threaded fit with the housing 1, one part of the adjusting screw 11 is positioned in the receiving cavity 431 to be abutted against the rocker shaft 4, and the other part extends out of the housing 1 to be in connected fit with the fastening nut 12.

Specifically, the adjusting member is set as an adjusting screw 11, one end of the adjusting member away from the rocker shaft 4 is disposed through a mounting hole provided in the housing 1 and is penetrated in the housing 1, and the adjusting member and the housing 1 can move relatively, threads matched with the adjusting screw 11 are disposed in the mounting hole, the housing 1 can limit the position of the adjusting screw 11 in the radial direction through the mounting hole, meanwhile, one end of the adjusting screw 11 away from the rocker shaft 4 is provided with a 'straight opening', a user can apply a torsion force to the adjusting screw 11 through the opening, and then the adjusting screw 11 is rotated, so that the adjusting screw 11 can move relatively to the housing 1 in the axial direction, the other end of the adjusting screw 11 is pressed against the rocker shaft 4 in a receiving cavity 431 formed in the tail connecting portion 43, so that the rocker shaft 4 can move in the axial direction through the adjusting screw 11, the engagement is more accurate, the abrasion of the following driven teeth 421 can be compensated, and the service life is prolonged.

And one end of the adjusting screw 11 far away from the rocker shaft 4 extends out of the shell 1 to be connected and matched with the fastening nut 12, after the rocker shaft 4 is moved to a required position by the adjusting screw, the fastening nut 12 can apply locking force to the adjusting screw 11 outside the shell 1, so that the position of the adjusting screw 11 is fixed relative to the shell 1 and the rocker shaft 4, and the meshing accuracy is ensured.

In some embodiments, the power steering gear 100 further comprises: a screw plug 13.

Specifically, one end of the adjusting screw 11 extends to the outside of the casing 1, for adjusting the position of the adjusting screw 11, the other end of the adjusting screw 11 is located in a containing cavity 431 formed by a tail connecting portion 43 of the rocker shaft 4, a limiting portion 111 is arranged at a portion of the adjusting screw 11 located in the containing cavity 431, the size of the limiting portion 111 in the radial direction is larger than the radial size of other portions of the adjusting screw 11, the power steering gear 100 is further provided with a plug screw 13, the plug screw 13 is located in the containing cavity 431, the plug screw 13 is in threaded connection with the tail connecting portion 43 and is limited to be pressed against the limiting portion 111, the plug screw 13 is arranged at one end, close to the casing 1, of the containing cavity 431, threads are arranged on the outer peripheral wall of the plug screw 13, threads are also arranged on the inner wall of the containing cavity 431, the plug screw 13 is connected with the containing cavity 431 through the threads, and is relatively fixed with the containing cavity 431, the limiting portion 111 of the adjusting screw 11 can be pressed against one side, close to the rocker shaft 11, of the plug screw 13, so that limiting function is performed on the limiting portion 11, thrust ball bearings 71 are arranged on two sides of the limiting portion 111, so that the adjusting screw 11 can provide axial thrust force and support functions.

In some embodiments, the power steering gear 100 further comprises: side covers 14.

Specifically, as shown in fig. 3, the main housing of the housing 1 is formed with a side mounting opening, which is larger than the rocker shaft 4, so that the rocker shaft 4 is suitable for being mounted in the main housing from the side mounting opening, the side cover 14 is detachably mounted on the side mounting opening, the side cover 14 can be connected to the mounting opening through a connecting piece such as a bolt 72, so that the rocker shaft 4 can be conveniently detached or the power steering gear 100 can be overhauled, the maintenance time of the power steering gear 100 is saved, the operation is more convenient, the mounting hole of the adjusting screw 11 is arranged on the side cover 14, one end of the adjusting screw 11 is penetrated on the side cover 14, and the side cover 14 can play a supporting and connecting role on the adjusting screw 11.

Further, the inner side of the side cover 14 is formed with a protrusion, and a needle bearing 83 is disposed between the protruding inner wall and the outer wall of the tail connection portion 43 to bear radial load generated by the rocker shaft 4, so as to ensure reliability of operation of the rocker shaft 4, and an oil seal 76 is disposed at one end of the rocker shaft 4, which is away from the side cover 14, and the oil seal 76, the main housing and the side cover 14 are formed with a sealed cavity, so that external impurities can be prevented from entering the power steering gear 100, meshing accuracy of the driving teeth 31 and the driven teeth 421 is prevented from being influenced, and stability of operation is ensured.

In some embodiments, as shown in fig. 3, the side cover 14 is provided with a supporting boss 141, the supporting boss 141 is supported on the inner peripheral wall of the side mounting opening and is in sealing fit with the main casing, the supporting boss 141 is provided with a sealing groove 75, the sealing groove 75 can be provided as a special-shaped sealing groove, an O-ring 74 can be installed in the sealing groove 75, the inner diameter circumference of the O-ring 74 is slightly smaller than that of the sealing groove 75, the O-ring 74 has a certain elasticity, the O-ring 74 is expanded to be sleeved in the sealing groove 75, the O-ring 74 is deformed in a restoring way to generate an elastic force, and the O-ring 74 can be relatively fixed with the sealing groove 75 by using the elastic force so as to ensure the sealing performance between the side cover 14 and the casing 1.

Meanwhile, as shown in fig. 2, the supporting boss 141 arranged at the inner side of the side cover 14 can provide a certain supporting force for the main casing in the radial direction, so that the connection strength between the side cover 14 and the main casing is improved, the side cover 14 is prevented from being subjected to radial force generated by the needle bearing 83 and the like, the connection failure of the side cover 14 and the main casing is prevented, and the service life is prolonged.

In some embodiments, the power steering gear 100 further comprises: an input structure 5 and a detection element 6.

Specifically, as shown in fig. 1, the input structure 5 includes an input shaft 51 and a torsion bar 52, one end of the torsion bar 52 is connected to an end of the torus worm 3, the input shaft 51 is sleeved outside the torsion bar 52 and circumferentially fixed to the other end of the torsion bar 52, and the detecting element 6 is configured to detect a deformation state of the torsion bar 52 when the input shaft 51 inputs power, and the booster driving structure 2 is configured to output steering boost according to the deformation state.

Further, the sliding bearing 78 and the torsion bar 52 are sequentially installed at the input end of the toroidal worm 3, the input shaft 51 is sleeved outside the torsion bar 52, a hole-shaped structure is arranged at the input shaft 51 and one end, far away from the toroidal worm 3, of the torsion bar 52 and the input shaft 51, relative fixation in the circumferential direction is realized by arranging the cylindrical pin 73 in the hole-shaped structure, one end, close to the toroidal worm 3, of the input shaft 51 is indirectly contacted and connected with the toroidal worm 3 through the sliding bearing 78, the conditions that contact surface abrasion and the like are caused by direct contact of the input shaft 51 with the toroidal worm 3 can be avoided, and a deep groove ball bearing 77 is arranged at one end, far away from the toroidal worm 3, of the input shaft 51 so as to provide supporting force for the input shaft 51.

Meanwhile, the power steering device 100 is further provided with a detecting element 6 for detecting the deformation state of the torsion bar 52 when the input shaft 51 inputs power, the external torque drives the input shaft 51 to rotate, the torsion bar 52 fixed with the circumference of the input shaft 51 is deformed, an angle difference is generated, the angle difference is identified by the detecting element 6 and converted into a rotation angle or torque signal to be output to a controller, the controller controls the power driving structure 2 to output corresponding power torque according to corresponding instructions, the power torque is transmitted to the input end of the torus worm 3 after being decelerated and torque-increased through the worm wheel 22 and the worm 21 arranged in the power driving structure 2, and then transmitted to the rocker shaft 4 through the torus worm 3, and the torque is converted into torque through the output end of the rocker shaft 4, so that the power steering of the vehicle is completed.

In some embodiments, the detecting element 6 includes a magnetic ring, a stator 84, and a rotor, the magnetic ring is disposed on the input shaft 51, the rotor is disposed on the torus worm 3, the stator 84 is connected with the fixing block 32, the fixing block 32 is formed with a waist-shaped hole 321, and the fixing block 32 is disposed on the housing 1 through the waist-shaped hole 321.

Specifically, the detecting element 6 is provided with a rotor, a stator 84 and a magnetic ring, and the magnetic ring and the rotor are respectively fixed on the input shaft 51 and the torus worm 3 by means of welding or the like to identify the deformation angle difference, so that a rotation angle or torque signal is output to the controller to control the power-assisted driving structure 2 to perform corresponding actions, and the response is quicker.

Meanwhile, as shown in fig. 8, the fixing block 32 is used for fixing the stator 84, and the fixing block 32 is formed with a waist-shaped hole 321, the stator 84 is mounted at a wedge-shaped block formed by the fixing block 32, and by the fixing manner, the stator 84 can have a plurality of adjustment manners such as rotation, displacement and the like within a small range, so that a plurality of connection states are satisfied, and the sensor is prevented from being affected in detection precision due to different setting positions and stress.

In some embodiments, the adjusting body 81 is arranged at one end of the toroidal worm 3, which is in power connection with the power-assisted driving structure 2, the outer ring of the tapered roller bearing 82 is pressed in the adjusting body 81 and locked by the locking nut 79, and the oil seal 76 and the O-ring 74 are also arranged, so that the cavity where the toroidal worm 3 is located is independent of the cavity where the power-assisted driving structure 2 is located, meanwhile, the tapered roller bearings 82 are arranged at two ends of the toroidal worm 3, one end of the toroidal worm 3, which is in power connection with the power-assisted driving structure 2, is connected with the adjusting body 81 through the tapered roller bearings 82, and the other end is connected with the housing 1 through the tapered roller bearings 82.

In some embodiments, as shown in fig. 1, the power-assisted driving structure 2 includes a worm 21, a worm wheel 22, a motor controller 23 and other structures, the motor controller 23 can control the motor to output the power-assisted torque required by steering, the motor transmits the power-assisted torque to the worm 21, the worm 21 and the worm wheel 22 cooperate to reduce the power-assisted torque and increase the torque and then transmit the power-assisted torque to one end of a torus worm 3 in power connection with the worm wheel 22, a driving tooth 31 is arranged in a middle section area of the torus worm 3, a driven tooth 421 is arranged at the upper end of the rocker shaft 4, the driving tooth 31 and the driven tooth 421 can be engaged and transmitted, the power-assisted torque acts on the torus worm 3, the torus worm 3 transmits the power-assisted torque to the rocker shaft 4 through the engaged driving tooth 31 and the driven tooth 421, and then the power-assisted torque outputs steering power through the rocker shaft 4, the axial position of the rocker shaft 4 is adjustable, that is the engagement position of the driving tooth 31 and the driven tooth can be adjusted, so that the engagement is more accurate and the transmission is smoother.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A power steering gear, comprising:

a housing;

the power-assisted driving structure is arranged on the shell;

the power-assisted steering device comprises a shell, a toroidal worm and a rocker arm shaft, wherein the toroidal worm and the rocker arm shaft are both positioned in the shell, the toroidal worm is in power connection with the power-assisted driving structure, the toroidal worm is provided with driving teeth, the rocker arm shaft is adjustable in axial position, the rocker arm shaft is provided with driven teeth which are meshed with the driving teeth for transmission, the driven teeth are in tooth thickness gradual change along the axial direction, and the rocker arm shaft is used for outputting steering torque.

2. A power steering gear according to claim 1, wherein the rocker shaft comprises a sector and a shaft, the sector and the shaft being coaxially arranged, the driven tooth being provided in the sector, the shaft being adapted for power connection with an external steering structure.

3. A power steering gear according to claim 2, wherein the driven teeth define a mating tooth form in the sector, the mating tooth form being in meshed drive with the driving teeth, the tooth faces of the mating tooth form including oppositely disposed first and second tooth faces, the helix angle of the first tooth face being different from the helix angle of the second tooth face.

4. A power steering gear according to claim 1, further comprising an adjustment structure mounted to the housing, the adjustment structure including an adjustment member movable relative to the housing for urging the rocker shaft to move axially.

5. The power steering apparatus according to claim 4, wherein the rocker shaft is provided with a tail connection portion, the tail connection portion is formed with a receiving cavity, the adjusting member is configured as an adjusting screw, the adjusting screw is arranged in the housing in a penetrating manner and is in threaded engagement with the housing, a part of the adjusting screw is positioned in the receiving cavity and is pressed against the rocker shaft, and the other part of the adjusting screw extends out of the housing to be in connection engagement with the fastening nut.

6. A power steering gear according to claim 5, further comprising: the screw plug is arranged at the part of the adjusting screw, which is positioned in the accommodating cavity, and is provided with a limiting part, the screw plug is positioned in the accommodating cavity, and the screw plug is in threaded connection with the tail connecting part and is in limiting abutting pressing with the limiting part.

7. A power steering gear according to claim 1, further comprising: and a side cover formed with a side mounting opening, the rocker shaft being adapted to be fitted into the housing from the side mounting opening, the side cover being detachably mounted to the side mounting opening.

8. The power steering apparatus according to claim 7, wherein the side cover is provided with a support boss that is supported on an inner peripheral wall of the side mounting port and is in sealing engagement with the housing.

9. A power steering gear according to claim 1, further comprising: the power assisting device comprises an input structure and a detection element, wherein the input structure comprises an input shaft and a torsion bar, one end of the torsion bar is connected with the end part of the annular worm, the input shaft is sleeved outside the torsion bar and circumferentially fixed with the other end of the torsion bar, the detection element is used for detecting the deformation state of the torsion bar when the input shaft inputs power, and the power assisting driving structure is used for outputting steering power according to the deformation state.

10. The power steering apparatus according to claim 9, wherein the detecting element includes a magnetic ring provided to the input shaft, a stator provided to the torus worm, and a rotor connected to a fixing block formed with a waist-shaped hole through which the fixing block is provided to the housing.