CN112026915B - Electric power steering apparatus and torque transmission mechanism thereof - Google Patents
Electric power steering apparatus and torque transmission mechanism thereof Download PDFInfo
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- CN112026915B CN112026915B CN202011009766.8A CN202011009766A CN112026915B CN 112026915 B CN112026915 B CN 112026915B CN 202011009766 A CN202011009766 A CN 202011009766A CN 112026915 B CN112026915 B CN 112026915B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0442—Conversion of rotational into longitudinal movement
- B62D5/0445—Screw drives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0442—Conversion of rotational into longitudinal movement
- B62D5/0454—Worm gears
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
Abstract
The invention discloses an electric power steering device and a torque transmission mechanism thereof, relating to the technical field of power transmission, comprising a shell and a screw rod transmission assembly arranged in the shell, wherein the screw rod transmission assembly comprises a screw rod, a steering nut, a screw rod nut and an output shaft, the screw rod nut is annularly sleeved on the screw rod, the steering nut is sleeved on the periphery of the screw rod nut, the steering nut is meshed with the output shaft, a first gap is arranged between the shell and the steering nut, a second gap is arranged between the steering nut and the screw rod nut, as the first gap is arranged between the shell and the steering nut, the second gap is arranged between the steering nut and the screw rod nut, and the width of the first gap is smaller than that of the second gap, the steering nut is firstly contacted with the shell, the shell provides reverse acting force for the steering nut, and the acting force is counteracted with radial force, the screw rod nut is prevented from being acted by radial force, and further the screw rod is prevented from being deformed due to the influence of the radial force.
Description
Technical Field
The invention relates to the technical field of power transmission, in particular to an electric power steering device and a torque transmission mechanism thereof.
Background
The electric steering gear of the recirculating ball is that a motor drives a steering screw nut to move up and down through a speed reducing mechanism, and the steering screw nut is converted into an output shaft to rotate so as to fulfill the aim of steering.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention provides an electric power steering device and a torque transmission mechanism thereof, aiming at the technical problem that a radial force can cause a steering screw rod to bend and deform.
2. Technical scheme
In order to solve the problems, the technical scheme provided by the invention is as follows: the utility model provides a torque transmission mechanism, includes the casing and locates the inside screw drive assembly of casing, screw drive assembly includes the lead screw, turns to nut, screw-nut and output shaft, screw-nut ring cover is on the lead screw, turn to the nut cover and establish screw-nut's periphery, turn to nut and output shaft meshing, casing and turn to first gap between the nut, turn to and have the second gap between nut and the screw-nut, the width in first gap and the width in second gap all with turn to nut's axial direction perpendicular, the width in first gap is less than the width in second gap.
The steering force applied on the steering wheel changes the left and right rotation motion of the screw rod into the reciprocating linear motion of the steering nut through the screw rod transmission assembly, then the reciprocating linear motion of the steering nut is converted into the forward and reverse rotation of the output shaft through the engagement of the steering nut and the output shaft, the steering arm vertical arm of the automobile swings back and forth along with the reciprocating linear motion, and further the left and right steering of the automobile is realized, in the process, the output shaft applies reverse radial force to the steering nut, the radial force pushes the steering nut to move towards the radial direction, because a first gap is arranged between the shell and the steering nut, a second gap is arranged between the steering nut and the screw rod nut, and the width of the first gap is smaller than that of the second gap, the steering nut is firstly contacted with the shell, the shell provides reverse acting force for the steering nut, the acting force is offset with the radial force, and the radial force action on the screw rod nut is avoided, and then avoided the lead screw to take place to warp because of receiving the influence of radial force, solved the lead screw and warp the problem.
Optionally, the width value of the first gap is 0.05-0.2 mm, and the width value of the second gap is 0.4-0.6 mm.
Optionally, the steering nut comprises a first body and a limiting plate arranged at two ends of the first body and perpendicular to the first body, the screw rod nut comprises a second body and end faces arranged at two ends of the second body and perpendicular to the second body, the limiting plate and the end faces are provided with holes for the screw rod to pass through, the inner side wall of the limiting plate is abutted against the outer side wall of the end face, and a second gap is formed between the first body and the second body.
Optionally, the limiting plate at one end of the first body is detachably connected with the first body.
Optionally, both the outer side wall of the limiting plate 122 and the inner side wall of the first body 121 are provided with threads 123, and the limiting plate 122 and the first body 121 are matched through the threads 123.
Optionally, one side of the first body connected with the output shaft is provided with a first tooth, and the output shaft is provided with a second tooth engaged with the first tooth.
Optionally, a steel ball is arranged between the screw rod nut and the screw rod, and the steel ball rolls in a ball groove formed by the screw rod and the screw rod nut.
Optionally, the screw rod transmission assembly further comprises a bearing, the screw rod comprises a screw rod section and smooth sections arranged at two ends of the screw rod section, the screw rod nut and the steering nut are arranged at the screw rod section, and the bearing is arranged at the smooth sections.
Optionally, the screw section and the smooth section are of an integrally formed structure.
The invention also discloses an electric power steering device which comprises a worm wheel, a worm matched with the worm wheel, a motor connected with the worm and the torque transmission mechanism, wherein the worm wheel is sleeved on the screw rod.
The steering wheel is connected with the input shaft, a torque sensor on the input shaft transmits force applied to the steering wheel to the motor, the motor applies force to the worm, the worm drives the worm wheel to rotate, the worm wheel transmits steering force to the lead screw, the lead screw drives the lead screw nut to move axially, the lead screw nut drives the steering nut to move axially, and the steering nut drives the second tooth through the first tooth to enable the output shaft to rotate.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the embodiment of the application provides a torque transmission mechanism, the output shaft exerts reverse radial force to steering nut, radial force promotes steering nut toward radial direction motion, because casing and steering nut between have first gap, steering nut and screw-nut between have the second gap, and the width in first gap is less than the width in second gap, make steering nut contact with the casing earlier, the casing provides reverse effort for steering nut, this effort offsets with radial force, screw-nut has been avoided receiving the effect of radial force, and then avoided the lead screw because of receiving the influence of radial force and taking place the deformation, the lead screw deformation problem has been solved.
Drawings
Fig. 1 is a schematic view of an overall structure of a torque transmission mechanism according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first gap and a second gap of a torque transmission mechanism according to an embodiment of the present invention.
Detailed Description
For a further understanding of the present invention, reference will now be made in detail to the embodiments illustrated in the drawings.
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. The terms first, second, and the like in the present invention are provided for convenience of describing the technical solution of the present invention, and have no specific limiting effect, but are all generic terms, and do not limit the technical solution of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solutions in the same embodiment and the technical solutions in different embodiments can be arranged and combined to form a new technical solution without contradiction or conflict, and the technical solutions are within the scope of the present invention.
Example 1
With reference to fig. 1-2, the torque transmission mechanism of the present embodiment includes a housing 2 and a lead screw transmission assembly 1 disposed inside the housing 2, where the lead screw transmission assembly 1 includes a lead screw 11, a steering nut 12, a lead screw nut 13 and an output shaft 14, the lead screw nut 13 is sleeved on the lead screw 11, the steering nut 12 is sleeved on the periphery of the lead screw nut 13, the steering nut 12 is engaged with the output shaft 14, a first gap 15 is formed between the housing 21 and the steering nut 12, a second gap 16 is formed between the steering nut 12 and the lead screw nut 13, the width of the first gap 15 and the width of the second gap 16 are both perpendicular to the axial direction of the steering nut 12, and the width of the first gap 15 is smaller than the width of the second gap 16. The steering force applied on the steering wheel changes the left and right rotation motion of the screw rod 11 into the reciprocating linear motion of the steering nut 12 through the screw rod transmission component 1, then the reciprocating linear motion of the steering nut 12 is converted into the positive and negative rotation of the output shaft 14 through the engagement of the steering nut 12 and the output shaft 14, the steering arm vertical arm of the automobile swings back and forth along with the reciprocating linear motion, and further the left and right steering of the automobile is realized, in the process, the output shaft 14 applies reverse radial force to the steering nut 12, the radial force pushes the steering nut 12 to move towards the radial direction, because the shell 21 and the steering nut 12 are provided with the first gap 15, the steering nut 12 and the screw nut 13 are provided with the second gap 16, the width of the first gap 15 is smaller than the width of the second gap 16, so that the steering nut 12 contacts with the shell 2 firstly, the shell 2 provides reverse acting force for the steering nut 12, and the acting force is counteracted with the radial force, the lead screw nut 13 is prevented from being acted by radial force, the lead screw 11 is prevented from deforming due to the influence of the radial force, and the problem of deformation of the lead screw 11 is solved. Lead screw 11 includes screw section 111 and locates the smooth section 112 at screw section 111 both ends, screw-nut 13 sets up at screw section 111 with steering nut 12, bearing 18 sets up at smooth section 112, and smooth section 112 includes first smooth section, bearing 18 includes first bearing and second bearing, the cover is equipped with first bearing and worm wheel 3 on the first smooth section, the one end and the first bearing cooperation of worm wheel 3, the other end of worm wheel supports and leans on the shaft shoulder department that is connected at screw section 111 and first smooth section. The worm wheel 3 is arranged at one end of the first bearing close to the screw section 111, and when the worm wheel 3 is meshed with the worm 4, the matching distance between the worm wheel 3 and the worm 4 is reduced, so that the structure of the torque transmission mechanism is more compact, and the installation area is reduced. And a second smooth section is arranged at one end, far away from the first smooth section, of the screw section 111, a second bearing is sleeved on the second smooth section, and the first bearing and the second bearing are used for bearing axial force.
Example 2
With reference to fig. 1-2, the torque transmission mechanism of the present embodiment can be improved as follows compared with the technical solution of embodiment 1: the width value of the first gap 15 is 0.05-0.2 mm, and the width value of the second gap 16 is 0.4-0.6 mm.
When the width of the first gap 15 is less than 0.05mm, the steering nut 12 is easy to abut against the housing 2 due to errors, and the movement of the steering nut 12 in the housing 2 is affected, when the width of the first gap 15 is greater than 0.2mm, the distance that the radial force pushes the steering nut 12 to move towards the radial direction is exceeded, so that the steering nut 12 cannot abut against the housing 2, and the purpose of eliminating the radial force is not achieved, when the width of the second gap 16 is less than 0.4mm, the steering nut 12 is easy to abut against the feed screw nut 13 due to errors under the action of the radial force, so that the feed screw 11 deforms, when the width of the second gap 16 is greater than 0.6mm, the distance between the feed screw nut 13 and the steering nut 12 is too large, so that the feed screw nut 13 shakes in the steering nut 12, when the width of the first gap 15 is 0.1mm, and the width of the second gap 16 is 0.5mm, so that the free movement of the steering nut 12 in the housing 2 is ensured, the steering nut 12 is also in contact with the housing 2 first under the action of radial force, so as to avoid contact with the feed screw nut 13 and deformation of the feed screw 11. The first slit 15 may also have widths of 0.05mm, 0.15mm and 0.2mm, and the second slit 16 may have widths of 0.4mm, 0.45mm, 0.55mm and 0.6 mm.
Example 3
With reference to fig. 1-2, the torque transmission mechanism of the present embodiment can be improved as follows compared with the technical solutions of embodiment 1 or 2: the steering nut 12 comprises a first body 121 and limiting plates 122 arranged at two ends of the first body 121 and perpendicular to the first body 121, the screw nut 13 comprises a second body 131 and end faces 132 arranged at two ends of the second body 131 and perpendicular to the second body 131, the limiting plates 122 and the end faces 132 are provided with holes for the screw rod 11 to pass through, the inner side wall of the limiting plate 122 is abutted against the outer side wall of the end face 132, and a second gap 16 is arranged between the first body 121 and the second body 131. The inner side wall of the limiting plate 122 is abutted against the outer side wall of the end face 132, so that the feed screw nut 13 is fixed inside the steering nut 12, and axial displacement between the feed screw nut 13 and the steering nut 12 is avoided.
Example 4
With reference to fig. 1-2, the torque transmission mechanism of the present embodiment can be modified as follows, compared with any of embodiments 1-3: the limiting plate 122 at one end of the first body 121 is detachably connected to the first body 121. When the lead screw nut 13 needs to be inspected, the limiting plate 122 at one end of the steering nut 12 is detached, so that the lead screw nut 13 is conveniently inspected even if the lead screw nut 13 is separated from the steering nut 12.
Example 5
With reference to fig. 1-2, the torque transmission mechanism of the present embodiment can be modified as follows, compared with any of embodiments 1-4: the outer side wall of the limiting plate 122 and the inner side wall of the first body 121 are both provided with threads 123, and the limiting plate 122 and the first body 121 are matched through the threads 123. When the limiting plate 122 needs to be detached, the limiting plate 122 and the first body 121 can be separated by unscrewing the threads 123, and the operation is convenient and fast.
Example 6
With reference to fig. 1-2, the torque transmission mechanism of the present embodiment can be modified as follows, compared with any of embodiments 1-5: the first body 121 is provided with a first tooth 124 at one side connected with the output shaft 14, and the output shaft 14 is provided with a second tooth 141 engaged with the first tooth 124. The steering nut 12 and the output shaft 14 are meshed through the first teeth 124 and the second teeth 141, so that the output shaft 14 is driven by the steering nut 12 to rotate forwards and reversely.
Example 7
With reference to fig. 1-2, the torque transmission mechanism of the present embodiment can be modified as follows, compared with any of embodiments 1-6: and a steel ball 17 is arranged between the screw rod nut 13 and the screw rod 11, and the steel ball 17 rolls in a ball groove 19 formed by the screw rod 11 and the screw rod nut 13. When the screw rod 11 and the screw rod nut 13 move relatively, the steel ball 17 circularly rolls in the ball groove 19, and the transmission friction is reduced.
Example 8
With reference to fig. 1-2, the torque transmission mechanism of the present embodiment can be modified as follows, compared with any of embodiments 1-7: the screw rod transmission assembly 1 further comprises a bearing 18, the screw rod 11 comprises a screw rod section 111 and smooth sections 112 arranged at two ends of the screw rod section 111, the screw rod nut 13 and the steering nut 12 are arranged on the screw rod section 111, and the bearing 18 is arranged on the smooth sections 112. In the use process, the output shaft 14 applies axial force to the steering nut 12, the steering nut 12 transmits the axial force to the bearings 18 at the two ends through the screw rod 11, and the bearings 18 bear the axial force, so that the screw rod 11 is prevented from being influenced.
Example 9
With reference to fig. 1-2, the torque transmission mechanism of the present embodiment can be modified as follows, compared with any of embodiments 1-8: the screw section 111 and the smooth section 112 are of an integrally formed structure. The integrally formed structure enables the screw rod 11 to be a whole without any connection, and has strong bearing capacity.
Example 10
With reference to fig. 1-2, the electric power steering apparatus of the present embodiment includes a worm wheel 3, a worm 4 engaged with the worm wheel 3, a motor 5 connected to the worm 4, and a torque transmission mechanism according to any one of the technical solutions of embodiments 1 to 9, wherein the worm wheel is sleeved on a lead screw 11. The steering wheel is connected with the input shaft, a torque sensor on the input shaft transmits force applied to the steering wheel to the motor 5, the motor 5 applies force to the worm 4, the worm 4 drives the worm wheel 3 to rotate, further the worm wheel 3 transmits steering force to the screw rod 11, the screw rod 11 drives the screw rod nut 13 to axially move, the screw rod nut 13 drives the steering nut 12 to axially move, and the steering nut 12 drives the second tooth 141 through the first tooth 124 to enable the output shaft 14 to rotate.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (10)
1. The utility model provides a torque transmission mechanism, its characterized in that includes the casing and locates the inside screw drive subassembly of casing, screw drive subassembly includes the lead screw, turns to nut, screw-nut and output shaft, screw-nut ring cover is on the lead screw, turn to the nut cover and establish the periphery at screw-nut, turn to nut and output shaft meshing, casing and turn to have first gap between the nut, turn to and have the second gap between nut and the screw-nut, the width in first gap and the width in second gap all are perpendicular with the axial direction who turns to the nut, the width in first gap is less than the width in second gap.
2. The torque transmission mechanism according to claim 1, wherein the width of the first gap is 0.05 to 0.2mm and the width of the second gap is 0.4 to 0.6 mm.
3. The torque transmission mechanism according to claim 1, wherein the steering nut includes a first body and limiting plates disposed at two ends of the first body and perpendicular to the first body, the screw nut includes a second body and end faces disposed at two ends of the second body and perpendicular to the second body, the limiting plates and the end faces are both provided with holes for the screw to pass through, the inner side wall of the limiting plate abuts against the outer side wall of the end face, and a second gap is formed between the first body and the second body.
4. The torque-transmitting mechanism of claim 3, wherein the retainer plate at the first body end is removably coupled to the first body.
5. The torque transmission mechanism according to claim 3, wherein the outer side wall of the limiting plate and the inner side wall of the first body are both provided with threads, and the limiting plate and the first body are matched through the threads.
6. The torque transmitting mechanism of claim 4, wherein the first body is provided with first teeth on a side thereof connected to the output shaft, and the output shaft is provided with second teeth that mesh with the first teeth.
7. The torque transmission mechanism according to claim 1, wherein steel balls are provided between the feed screw nut and the feed screw, and the steel balls roll in a ball groove formed between the feed screw and the feed screw nut.
8. The torque transmission mechanism according to claim 1, wherein the lead screw transmission assembly further comprises a bearing, the lead screw comprises a screw section and smooth sections arranged at two ends of the screw section, the lead screw nut and the steering nut are arranged at the screw section, and the bearing is arranged at the smooth sections.
9. The torque transmitting mechanism of claim 8, wherein the screw section and the smooth section are of integrally formed construction.
10. An electric power steering device is characterized by comprising a worm wheel, a worm matched with the worm wheel, a motor connected with the worm and the torque transmission mechanism of any one of claims 1-9, wherein the worm wheel is sleeved on a screw rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011009766.8A CN112026915B (en) | 2020-09-23 | 2020-09-23 | Electric power steering apparatus and torque transmission mechanism thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011009766.8A CN112026915B (en) | 2020-09-23 | 2020-09-23 | Electric power steering apparatus and torque transmission mechanism thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112026915A CN112026915A (en) | 2020-12-04 |
| CN112026915B true CN112026915B (en) | 2021-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011009766.8A Active CN112026915B (en) | 2020-09-23 | 2020-09-23 | Electric power steering apparatus and torque transmission mechanism thereof |
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| CN (1) | CN112026915B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112937675A (en) * | 2021-04-06 | 2021-06-11 | 舍弗勒技术股份两合公司 | Electric power steering apparatus |
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| JP2004314852A (en) * | 2003-04-17 | 2004-11-11 | Showa Corp | Mounting structure of ball nut in motor-driven steering device |
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| CN104976300A (en) * | 2014-04-07 | 2015-10-14 | 株式会社捷太格特 | Ball Screw Device, Power Transfer Mechanism, Electric Power Steering Apparatus, And Method For Manufacturing Ball Screw Device |
| CN105501293A (en) * | 2016-01-26 | 2016-04-20 | 荆州恒隆汽车技术(检测)中心 | Electric hydraulic steering device for commercial vehicle |
| CN109131534A (en) * | 2018-10-11 | 2019-01-04 | 杭州世宝汽车方向机有限公司 | A kind of recirculating ball-type steering |
| CN209566974U (en) * | 2018-12-30 | 2019-11-01 | 山东汇川汽车部件有限公司 | A kind of circulating ball type electric steering device |
| CN111284556A (en) * | 2020-04-03 | 2020-06-16 | 山东先河汽车转向器有限公司 | Circulating ball type electric power steering gear |
| CN111688795A (en) * | 2020-04-28 | 2020-09-22 | 大连创新零部件制造公司 | Mechanical circulating ball type electric power steering device |
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2020
- 2020-09-23 CN CN202011009766.8A patent/CN112026915B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004314852A (en) * | 2003-04-17 | 2004-11-11 | Showa Corp | Mounting structure of ball nut in motor-driven steering device |
| CN1647984A (en) * | 2005-03-17 | 2005-08-03 | 北京理工大学 | Circular ball type electric booster steering device |
| CN104976300A (en) * | 2014-04-07 | 2015-10-14 | 株式会社捷太格特 | Ball Screw Device, Power Transfer Mechanism, Electric Power Steering Apparatus, And Method For Manufacturing Ball Screw Device |
| CN105501293A (en) * | 2016-01-26 | 2016-04-20 | 荆州恒隆汽车技术(检测)中心 | Electric hydraulic steering device for commercial vehicle |
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