CN112193321B - Angle limiting device of drive-by-wire steering system - Google Patents
Angle limiting device of drive-by-wire steering system Download PDFInfo
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- CN112193321B CN112193321B CN202011071749.7A CN202011071749A CN112193321B CN 112193321 B CN112193321 B CN 112193321B CN 202011071749 A CN202011071749 A CN 202011071749A CN 112193321 B CN112193321 B CN 112193321B
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- limiting
- screw shaft
- sliding sleeve
- steering wheel
- steer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D15/00—Steering not otherwise provided for
- B62D15/02—Steering position indicators ; Steering position determination; Steering aids
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
Abstract
The invention relates to an angle limiting device of a wire-controlled steering system, wherein a screw shaft can be rotatably sleeved in a limiting shell along a central shaft, a connecting piece comprises a steering wheel output shaft connecting part and a screw shaft connecting part which are of an integral structure, the connecting piece is fixedly connected with the screw shaft through the screw shaft connecting part, a limiting sliding sleeve is sleeved on the screw shaft through a thread structure in a matching mode, two opposite sides of the limiting sliding sleeve are respectively provided with a kidney-shaped groove along the axial direction, two opposite sides of the limiting shell are respectively provided with a limiting bolt, the shaft ends of the limiting bolts on the two sides are respectively inserted into the kidney-shaped grooves on the two sides of the limiting sliding sleeve, and the limiting sliding sleeve is driven to move back and forth through the rotation of the screw shaft, so that the front end and the rear end of each kidney-shaped groove are respectively contacted with the limiting bolt to limit the rotation angle of a steering wheel. The invention realizes the limitation of the steering wheel rotation angle after the steer-by-wire system is powered off, achieves the purpose of protecting the clock spring, and avoids the clock spring from being broken due to the over-limit of the steering wheel rotation angle.
Description
Technical Field
The invention belongs to the technical field of automobile steering systems, and particularly relates to an angle limiting device of a wire-controlled steering system.
Background
The steer-by-wire system is characterized in that a driver input interface (steering wheel) and an actuating mechanism (steering wheel) are connected through a steer-by-wire (electronic signal), aiming at a steer-by-wire column connected with a mechanical clutch, the mechanical clutch is in a separation state during normal work so as to realize the mechanical separation of the driver input interface and the actuating mechanism, and the steering actuating mechanism is controlled by a controller to steer and feed back road feel information to a hand-feel motor so as to simulate road conditions and output the road conditions to the interface steering wheel. When the controller fails or is powered off, the mechanical clutch is closed to realize the connection of the driver input interface and the actuating mechanism, the drive-by-wire function fails, the whole system is changed into PEPS or REPS, and the rotating angle of the steering wheel is controlled within the angle range of the clock spring due to the existence of the mechanical clutch.
However, for a steer-by-wire column without a mechanical clutch connection, it is necessary to limit the range of the rotation angle so as to prevent the clock spring from being broken due to the over-limit of the rotation angle. In general, in a wire-controlled steering system, most of the devices rely on a controller to control a hand-feeling motor to limit the steering angle of a steering wheel, but when power is off or control fails, the device cannot limit the steering angle of the steering wheel, so that the protection of a clock spring is lost.
At the present stage, the development trend of steer-by-wire is mainly restricted to the safety level of the steer-by-wire function, and the mechanical clutch limits the flexible arrangement mode of the steer-by-wire system and the safety during collision. The subsequent trend is to increase the safety level of the system, thereby eliminating mechanical clutches to achieve true steer-by-wire and reduce costs. Therefore, another angle limiting device is needed to protect the clock spring after power-off.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the angle limiting device of the steer-by-wire system, so that the limit of the steer wheel rotation angle after the steer-by-wire system is powered off is realized, the purpose of protecting a clock spring is achieved, and the clock spring is prevented from being broken due to the over-limit of the steering wheel rotation angle.
The technical scheme adopted by the invention for solving the technical problems is to provide an angle limiting device of a wire-controlled steering system, which comprises a limiting shell, a screw shaft, a connecting piece, a limiting sliding sleeve and a limiting bolt, the screw shaft can be rotatably sleeved in the limiting shell along the central shaft, the connecting piece comprises a steering wheel output shaft connecting part and a screw shaft connecting part which are integrally formed, the connecting piece is fixedly connected with the screw shaft through a screw shaft connecting part, the limiting sliding sleeve is matched and sleeved on the screw shaft through a thread structure, the two opposite sides of the limiting sliding sleeve are respectively provided with a kidney-shaped groove along the axial direction, the two opposite sides of the limiting shell are respectively provided with a limiting bolt, the shaft ends of the limiting bolts at the two sides are respectively inserted into the kidney-shaped grooves at the two sides of the limiting sliding sleeve, the screw shaft rotates to drive the limiting sliding sleeve to move back and forth, so that the front end and the rear end of the kidney-shaped groove are respectively contacted with the limiting bolt to limit the rotating angle of the steering wheel.
The steering wheel output shaft connecting portion is an anchor ear type spline housing, an inner spline and a tooth-missing positioning plane are arranged inside the anchor ear type spline housing, when the anchor ear type spline housing and the steering wheel output shaft are connected in a relative positioning mode to enable the steering wheel to be located at the middle position, the limiting sliding sleeve is located at the middle position of the limiting stroke.
The screw shaft connecting part is connected with the end part of the screw shaft in an interference fit mode, and a convex shoulder structure for limiting the installation depth of the end part of the screw shaft is arranged inside the screw shaft connecting part.
The rear end part of the screw shaft penetrates through a bearing, and the bearing is positioned and installed in the limiting shell.
The front end part of the screw rod shaft penetrates through a bushing, the bushing is sleeved on an inner ring of a bearing, and the bearing is positioned and installed in the limiting shell.
The outer ring both sides of bearing carry out axial positioning through keeping off the shoulder and the jump ring of spacing casing respectively, the outer lane portion of jump ring is the inclined plane structure, be equipped with the bevel groove on the spacing casing, the outer lane portion of jump ring inserts in the bevel groove, the inner circle portion forms with the outer lane of bearing and supports and presses.
The inner ring of the bearing is axially positioned by a shoulder on the screw shaft.
The bushing comprises a lantern ring and an annular gasket arranged on the outer side of the lantern ring, the front end part of the screw rod shaft is sleeved with an adjusting nut, and the adjusting nut compresses the annular gasket to axially position an inner ring of the bearing.
Be equipped with the fluting with the inner chamber intercommunication on the spacing casing, both sides are equipped with the step respectively around the fluting, spacing sliding sleeve corresponds grooved direction and is equipped with bow-shaped groove, when spacing sliding sleeve is in the intermediate position of spacing stroke, the both sides edge of bow-shaped groove corresponds with the edge of both sides step respectively, when spacing sliding sleeve is in limiting position, one side edge of bow-shaped groove corresponds with the edge of one side step among them.
The limiting shell is provided with a mounting seat, and bolt mounting holes are formed in two sides of the mounting seat respectively.
Advantageous effects
The steering wheel rotation angle limiting device can limit the rotation angle of the steering wheel after the steer-by-wire system is powered off, so that the purpose of protecting the clock spring is achieved, the clock spring is prevented from being broken due to the fact that the rotation angle of the steering wheel exceeds the limit, the structural stability is good, the noise is low, and the assembly is easy.
Drawings
Fig. 1 is a schematic cross-sectional structure of the present invention.
FIG. 2 is a schematic structural view (front end view) of the assembly of the present invention.
Fig. 3 is a schematic structural view (rear end view) of the assembly of the present invention.
Fig. 4 is a schematic structural view of the limiting sliding sleeve.
Fig. 5 is a schematic plan view of the connector.
Fig. 6 is a schematic view of the cross-sectional structure a-a in fig. 5.
Fig. 7 is a schematic view of the construction of the bushing.
Fig. 8 is a plan view of the bushing.
Fig. 9 is a schematic structural view of a limit bolt.
Fig. 10 is a schematic plan view of the limit bolt.
Fig. 11 is a schematic structural diagram of the snap spring.
Fig. 12 is a schematic view (first view) of the assembly relationship between the limiting sliding sleeve and the limiting shell when the limiting sliding sleeve is located at the middle position of the limiting stroke.
Fig. 13 is a schematic view (second view) illustrating an assembly relationship between the limiting sliding sleeve and the limiting shell when the limiting sliding sleeve is located at the middle position of the limiting stroke.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
As shown in fig. 1, the angle limiting device of the steer-by-wire system comprises a limiting shell 1, a screw shaft 2, a connecting piece 3, a bearing 4, a snap spring 5, a limiting sliding sleeve 6, a limiting bolt 7, a bushing 8 and an adjusting nut 9.
The screw shaft 2 is rotatably sleeved in the limiting shell 1 along a central shaft. As shown in fig. 1, the front end and the rear end of the screw shaft 2 provide rotational support for the screw shaft 2 through bearings 4, respectively. Bearing 4 outer lane all with spacing casing 1 clearance fit, outer lane axial positioning relies on step on spacing casing 1 to keep off shoulder and jump ring 5. The rear end part of the screw shaft 2 passes through the bearing 4, and the inner ring of the bearing 4 at the rear end part is in clearance fit with the screw shaft 2. The front end part of the screw shaft 2 penetrates through the bush 8, the bush 8 is sleeved on the inner ring of the bearing 4, the bearing 4 at the front end part is in interference fit with the bush 8, and the bush 8 is in clearance fit with the screw shaft 2. The inner ring of the bearing 4 at the rear end part is axially positioned by depending on the shoulder of the screw shaft 2, and the inner ring of the bearing 4 at the front end part is locked by depending on the annular gasket 8-2 of the bush 8 and the adjusting nut 9.
Referring to fig. 2 and 3, the limiting shell 1 is provided with mounting seats 1-3, and two sides of the mounting seats 1-3 are respectively provided with bolt mounting holes 1-4. The mounting seats 1-3 of the limiting shell 1 are rigidly connected with the outer shell through bolt mounting holes 1-4 at two sides of the figure, the structure of the outer shell is fixed relative to the whole vehicle, namely in an angle limiting system, the limiting shell 1 is regarded as a fixing piece and provides supporting force for other parts and reaction torque for mechanical limiting after rotation.
Referring to fig. 5, the connecting member 3 includes a steering wheel output shaft connecting portion 3-1 and a screw shaft connecting portion 3-2 which are integrally formed. As shown in fig. 6, the connecting portion 3-1 of the steering wheel output shaft is an anchor ear type spline housing, the inner spline 3-3 of the anchor ear type spline housing is in clearance fit with the outer spline of the external steering wheel output shaft, and the inner spline 3-3 and the outer spline of the external steering wheel output shaft are both provided with a tooth-missing positioning plane 3-4, so that a relatively fixed installation angle relationship between the anchor ear type spline housing and the steering wheel output shaft is realized, that is, when the steering wheel is in a middle position, the angle limiting device is correspondingly in a middle position of a limiting stroke. After the internal spline and the external spline are matched, the external bolt is screwed into the threaded hole 3-5 through the unthreaded hole 3-5 on the spline housing, and the elastic deformation of the structure at the spline can be realized by the pretightening force provided by the external bolt and the slotted structure 3-7 on the spline housing, so that the fit clearance with the external spline is reduced, and the holding is realized. To this end, the torque and angle may be input to the angle limiting device by the steering wheel.
Referring to fig. 1, a screw shaft connecting portion 3-2 is connected with an end portion of a screw shaft 2 in an interference fit manner, and a shoulder structure for limiting the installation depth of the end portion of the screw shaft 2 is arranged inside the screw shaft connecting portion 3-2.
Referring to fig. 11, the outer ring portion 5-1 of the snap spring 5 is an inclined surface structure having an inclined surface of 15 degrees, and the position-limiting housing 1 is provided with an inclined groove. When in use, the clamp spring 5 can be in inclined surface fit with the corresponding inclined opening groove on the limiting shell 1, so that the outer ring part 5-1 of the clamp spring 5 is inserted into the inclined opening groove, and the inner ring part 5-2 and the outer ring of the bearing 4 form abutting pressure, thereby providing a pressure pointing to the bearing to eliminate the axial gap of the bearing 4 and avoiding the noise problem caused by the axial movement of the bearing due to the reversing of the steering wheel.
Referring to fig. 7 and 8, the bushing 8 includes a collar 8-1 and an annular gasket 8-2 disposed outside the collar 8-1. The plastic lubricating material structure of the collar 8-1 contacts the screw shaft 2 to reduce rotational friction. The bushing 8, when injection molded, comprises an annular gasket 8-2 of metal material, which is in contact with the adjusting nut 9. When the adjusting nut 9 is screwed into the front end part of the screw shaft 2 through threads and locked, the pre-tightening axial force acts on the annular gasket 8-2 and is transmitted to the inner ring of the bearing 4, so that the stress strength of the annular gasket 8-2 is increased, and the inner ring of the bearing 4 is axially limited.
Referring to fig. 1 and 4, the limiting sliding sleeve 6 is in clearance fit with the limiting housing 1 and is fitted and sleeved on the screw shaft 2 through a trapezoidal thread structure. The opposite sides of the limiting sliding sleeve 6 are respectively provided with a kidney-shaped groove 6-1 along the axial direction, and the opposite sides of the limiting shell 1 are respectively provided with a limiting bolt 7 through a threaded hole. As shown in fig. 9 and 10, the stopper bolt 7 includes an elastic washer 7-1 having a non-threaded optical axis 7-2 at the end. The optical axes 7-2 of the limiting bolts 7 on the two sides are respectively inserted into the kidney-shaped grooves 6-1 on the two sides of the limiting sliding sleeve 6. When the limiting device works, the screw shaft 2 rotates to drive the limiting sliding sleeve 6 to move through the trapezoidal threads, the optical axis 7-2 of the limiting bolt 7 is inserted into the waist-shaped grooves 6-1 on the two sides of the limiting sliding sleeve 6 to limit the rotation freedom of the limiting sliding sleeve 6, and the limiting sliding sleeve 6 moves back and forth along the axial direction. The screw shaft 2 rotates to drive the limiting sliding sleeve 6 to move back and forth, so that the front end and the rear end of the kidney-shaped groove 6-1 are respectively contacted with the limiting bolt 7 to form limiting, and the rotating angle of the steering wheel is limited. When the steering wheel rotates in a single direction by 540 degrees, the limit sliding sleeve 6 moves in a single direction for a stroke corresponding to the parameters of the screw shaft 2, and at the moment, the kidney-shaped grooves 6-1 at the two sides of the limit sliding sleeve 6 are in mechanical contact with the optical axis 7-2 of the limit bolt 7, so that the limit function of the rotation angle is realized. At the moment, the limiting sliding sleeve 6 and the bearing 4 still have a certain designed clearance amount in the axial direction, and the purpose is to reduce the contact surface pretightening force caused by the action torque when the limiting bolt 7 and the limiting ring sleeve 6 are limited.
Referring to fig. 3, 12 and 13, the limiting housing 1 is provided with a slot 1-1 communicated with the inner cavity, the front side and the rear side of the slot 1-1 are respectively provided with a step 1-2, and the limiting sliding sleeve 6 is provided with an arcuate groove 6-2 corresponding to the slot 1-1. When the limiting sliding sleeve 6 is in the middle position of the limiting stroke, edges on two sides of the arc-shaped groove 6-2 respectively correspond to edges of the steps 1-2 on two sides; when the limiting sliding sleeve 6 moves forwards to be in a limiting position, the rear side edge of the arched groove 6-2 corresponds to the edge of the front side step 1-2; when the limiting sliding sleeve 6 moves backwards to be in a limiting position, the front side edge of the arched groove 6-2 corresponds to the edge of the rear side step 1-2. The slotted edge of the limiting slide block 6 can have unique corresponding position relation with the step edge of the slot 1-1 of the limiting shell 1, so that the position of the limiting slide block 6 in the limiting shell 1 can be identified and positioned conveniently during assembly and application.
Claims (9)
1. The utility model provides a steer-by-wire system angle stop device which characterized in that: the steering wheel limiting device comprises a limiting shell (1), a screw shaft (2), a connecting piece (3), a limiting sliding sleeve (6) and a limiting bolt (7), wherein the screw shaft (2) can be rotatably sleeved in the limiting shell (1) along a central shaft, the connecting piece (3) comprises a steering wheel output shaft connecting part (3-1) and a screw shaft connecting part (3-2) which are integrally structured, the connecting piece (3) is fixedly connected with the screw shaft (2) through the screw shaft connecting part (3-2), the limiting sliding sleeve (6) is matched and sleeved on the screw shaft (2) through a thread structure, waist-shaped grooves (6-1) are respectively formed in the two opposite sides of the limiting sliding sleeve (6) along the axial direction, the limiting bolt (7) is respectively installed on the two opposite sides of the limiting shell (1), shaft ends of the limiting bolts (7) on the two sides are respectively inserted into the waist-shaped grooves (6-1) on the two sides of the limiting sliding sleeve (6), the screw shaft (2) rotates to drive the limiting sliding sleeve (6) to move back and forth, so that the front end and the rear end of the kidney-shaped groove (6-1) are respectively contacted with the limiting bolt (7) to limit the rotating angle of the steering wheel;
be equipped with fluting (1-1) with the inner chamber intercommunication on spacing casing (1), both sides are equipped with step (1-2) respectively around fluting (1-1), spacing sliding sleeve (6) correspond the direction of fluting (1-1) and are equipped with bow-shaped groove (6-2), when spacing sliding sleeve (6) is in the intermediate position of spacing stroke, the both sides edge of bow-shaped groove (6-2) corresponds with the edge of both sides step (1-2) respectively, when spacing sliding sleeve (6) is in limiting position, one side edge of bow-shaped groove (6-2) corresponds with the edge of one of them side step (1-2).
2. The steer-by-wire system angle limiting device of claim 1, wherein: the steering wheel output shaft connecting portion (3-1) is an anchor ear type spline housing, an inner spline (3-3) and a tooth-missing positioning plane (3-4) are arranged inside the anchor ear type spline housing, the anchor ear type spline housing and the steering wheel output shaft are connected in a relative positioning mode, so that when the steering wheel is located at the middle position, the limiting sliding sleeve (6) is located at the middle position of the limiting stroke.
3. The steer-by-wire system angle limiting device of claim 1, wherein: the screw shaft connecting part (3-2) is connected with the end part of the screw shaft (2) in an interference fit mode, and a convex shoulder structure for limiting the installation depth of the end part of the screw shaft (2) is arranged inside the screw shaft connecting part (3-2).
4. The steer-by-wire system angle limiting device of claim 1, wherein: the rear end part of the screw shaft (2) penetrates through a bearing (4), and the bearing (4) is positioned and installed in the limiting shell (1).
5. The steer-by-wire system angle limiting device of claim 1, wherein: the front end part of the screw shaft (2) penetrates through a bushing (8), the bushing (8) is sleeved on an inner ring of a bearing (4), and the bearing (4) is positioned and installed in the limiting shell (1).
6. The steer-by-wire system angle limiting device of claim 4 or 5, wherein: the bearing is characterized in that two sides of the outer ring of the bearing (4) are axially positioned through a retaining shoulder of the limiting shell (1) and the clamp spring (5), the outer ring part (5-1) of the clamp spring (5) is of an inclined plane structure, an inclined opening groove is formed in the limiting shell (1), the outer ring part (5-1) of the clamp spring (5) is inserted into the inclined opening groove, and the inner ring part (5-2) and the outer ring of the bearing (4) form pressing.
7. The steer-by-wire system angle limiting device of claim 4, wherein: the inner ring of the bearing (4) is axially positioned by a convex shoulder on the screw shaft (2).
8. The steer-by-wire system angle limiting device of claim 5, wherein: the bushing (8) comprises a sleeve ring (8-1) and an annular gasket (8-2) arranged on the outer side of the sleeve ring (8-1), the front end of the screw rod shaft (2) is sleeved with an adjusting nut (9), and the adjusting nut (9) compresses the annular gasket (8-2) to axially position the inner ring of the bearing (4).
9. The steer-by-wire system angle limiting device of claim 1, wherein: the limiting shell (1) is provided with a mounting seat (1-3), and bolt mounting holes (1-4) are respectively formed in two sides of the mounting seat (1-3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011071749.7A CN112193321B (en) | 2020-10-09 | 2020-10-09 | Angle limiting device of drive-by-wire steering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011071749.7A CN112193321B (en) | 2020-10-09 | 2020-10-09 | Angle limiting device of drive-by-wire steering system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112193321A CN112193321A (en) | 2021-01-08 |
| CN112193321B true CN112193321B (en) | 2021-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011071749.7A Active CN112193321B (en) | 2020-10-09 | 2020-10-09 | Angle limiting device of drive-by-wire steering system |
Country Status (1)
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| CN (1) | CN112193321B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3217497B2 (en) * | 1992-09-30 | 2001-10-09 | アイシン精機株式会社 | Neutral return mechanism for rear wheel steering system |
| DE19918313A1 (en) * | 1999-04-22 | 2000-10-26 | Alcatel Sa | Angle sensing instrument for monitoring position of shaft with limited rotation has codes printed or inscribed on disc and read by optical detector |
| JP2001130426A (en) * | 1999-11-09 | 2001-05-15 | Nsk Ltd | Steering device for vehicle |
| CN203111305U (en) * | 2013-03-07 | 2013-08-07 | 青岛科技大学 | Drive-by-wire limiting mechanism of switching of steering models of steering vehicle |
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2020
- 2020-10-09 CN CN202011071749.7A patent/CN112193321B/en active Active
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| CN112193321A (en) | 2021-01-08 |
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