CN220639999U - Electric power steering device and nut and screw rod assembly thereof - Google Patents
Electric power steering device and nut and screw rod assembly thereof Download PDFInfo
- Publication number
- CN220639999U CN220639999U CN202322265380.9U CN202322265380U CN220639999U CN 220639999 U CN220639999 U CN 220639999U CN 202322265380 U CN202322265380 U CN 202322265380U CN 220639999 U CN220639999 U CN 220639999U
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- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Abstract
The utility model discloses an electric power steering device and a nut and screw assembly thereof, and relates to the technical field of automobile steering. The size of the rack nut body is not changed, the whole rack is arranged at the first end of the steering nut in a deflection way, so that the direction moving distance of the rocker arm axial input shaft is reduced, the strength of the steering nut is ensured, and the installation environment with relatively tight space near the chassis is adapted under the condition that the force born by the steel ball inside the steering nut is unchanged.
Description
Technical Field
The utility model relates to the technical field of automobile steering, in particular to an electric power steering device and a nut and screw rod assembly thereof.
Background
The electric automobile comprises a frame and a chassis which is arranged corresponding to the frame, the chassis generally comprises a suspension system, a running system, a steering system and a braking system, the steering system comprises a motor, a worm shaft which is connected to the motor and rotates together with the motor, a worm wheel which is connected to a transmission screw and is meshed with the worm shaft to rotate, a steering nut which is arranged on the transmission screw, and a rocker shaft which is meshed with the steering nut, the transmission screw is driven to rotate by the worm wheel and the worm, and steel balls between the transmission screw and the steering nut enable the rotation of the transmission screw to be changed into linear motion, so that the steering nut drives the rocker shaft to reciprocate along an axis. Along with the increasing multifunctional demands of people on electric automobiles, parts arranged on the chassis are more and more, so that the space near the chassis is more and more crowded, and when the steering nut drives the rocker shaft to move towards the direction of the input shaft, other parts on the chassis can cause obstruction to the movement of the steering nut.
Disclosure of Invention
1. Technical problem to be solved by the utility model
In order to solve the technical problems, the utility model provides the electric power steering device and the nut and screw rod assembly thereof, which enable the direction moving distance of the rocker arm to the axial input shaft to be reduced, thereby adapting to the installation environment with relatively tight space near the chassis.
2. Technical proposal
In order to solve the problems, the technical scheme provided by the utility model is as follows: the utility model provides a nut and lead screw assembly, includes ball screw and the turn to nut of cover at ball screw periphery wall, ball screw one end is used for connecting the input shaft, and the ball screw other end is used for installing the worm wheel, turn to nut one side and be equipped with the rack, the rack is biased to turn to the one end that the nut is close to the input shaft.
Optionally, the ball screw includes first connecting rod, second connecting rod and the third connecting rod that connects gradually, second connecting rod periphery wall is equipped with the external screw thread, turn to the nut setting on the second connecting rod, first connecting rod is used for connecting the input shaft, the third connecting rod is used for installing the worm wheel.
Optionally, the end of the steering nut adjacent to the first link is defined as a first end, the end of the steering nut adjacent to the third link is defined as a second end, and the rack is biased toward the first end.
Optionally, an inner nut is arranged in the steering nut, the inner nut is sleeved on the outer peripheral wall of the ball screw, and a gap is reserved between the steering nut and the inner nut.
The utility model also discloses an electric power steering device which comprises an input shaft, a worm wheel, a rocker shaft, a worm, a motor, the nut and screw rod assembly, wherein the input shaft is connected with the ball screw rod, the worm wheel is sleeved at one end of the ball screw rod, which is far away from the input shaft, the rocker shaft is meshed with the steering nut, one end of the worm is meshed with the worm wheel, and the other end of the worm is connected with the motor.
Optionally, the worm wheel includes tooth portion, web and shaft portion, tooth portion and worm meshing, the shaft portion is used for connecting ball screw, tooth portion and shaft portion are connected respectively to the web, tooth portion both sides and shaft portion both sides all bulge in the web, and the shaft portion bulge is less than tooth portion bulge in the height of web.
Optionally, the first connecting rod of the ball screw is provided with a first bearing, the third connecting rod of the ball screw is provided with a second bearing, and the second bearing and the shaft part are abutted against each other.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:
(1) The nut and the screw rod assembly that this application embodiment provided, the size of turning to the nut body does not change, and the rack wholly is the setting of biasing to the first end of turning to the nut, makes the direction travel distance of rocking arm axial input shaft diminish, guarantees the intensity that turns to the nut, turns to under the circumstances that the inside steel ball of nut bears the unchangeable to adapt to the comparatively tension installation environment in space near chassis department.
(2) The embodiment of the application provides an electric power steering device, the worm wheel sets up the one end that the input shaft was kept away from to ball screw, makes worm and motor also be located the one end that the input shaft was kept away from to ball screw to make input shaft and ball screw be close to the shared space greatly reduced of chassis one end, when the automobile is close to chassis position space limited, ensure electric power steering device normal installation.
Drawings
Fig. 1 is a schematic structural diagram of a nut and screw assembly according to an embodiment of the present utility model.
Fig. 2 is a schematic view of an electric power steering apparatus according to an embodiment of the present utility model.
Fig. 3 is a schematic view of a worm wheel of an electric power steering apparatus according to an embodiment of the present utility model.
The marks in the drawings are as follows: 1. a ball screw; 11. a first link; 12. a second link; 13. a third link; 2. a steering nut; 21. a rack; 22. a first end; 23. a second end; 3. an input shaft; 4. a worm wheel; 41. a tooth portion; 42. a web; 43. a shaft portion; 5. a rocker shaft; 6. a worm; 7. a motor; 8. a first bearing; 9. and a second bearing.
Detailed Description
For a further understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples.
The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the utility model are shown in the drawings. The first, second, etc. words are provided for convenience in describing the technical scheme of the present utility model, and have no specific limitation, and are all generic terms, and do not constitute limitation to the technical scheme of the present utility model. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. 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 specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 technical schemes in the same embodiment and the technical schemes in different embodiments can be arranged and combined to form a new technical scheme without contradiction or conflict, which is within the scope of the utility model.
Example 1
Referring to fig. 1 and 2, the nut and screw assembly of the present embodiment includes a ball screw 1 and a steering nut 2 sleeved on the outer peripheral wall of the ball screw 1, one end of the ball screw 1 is used for connecting an input shaft 3, the other end of the ball screw 1 is used for installing a worm wheel 4, one side of the steering nut 2 is provided with a rack 21, and the rack 21 is biased to one end of the rack 21, which is close to the input shaft 3. The size of the nut body of the rack 21 is not changed, the rack 21 is arranged at the first end 22 of the steering nut 2 in a deflection way, so that the moving distance of the rocker shaft 5 towards the direction of the input shaft 3 is reduced, the strength of the steering nut 2 is ensured, and the installation environment with relatively tight space near the chassis is adapted under the condition that the force born by the steel ball in the steering nut 2 is unchanged.
Example 2
With reference to fig. 1, compared with the technical solution of embodiment 1, the nut and screw assembly of this embodiment can be improved as follows: the ball screw 1 comprises a first connecting rod 11, a second connecting rod 12 and a third connecting rod 13 which are sequentially connected, an external thread is arranged on the peripheral wall of the second connecting rod 12, the steering nut 2 is arranged on the second connecting rod 12, the first connecting rod 11 is used for connecting the input shaft 3, and the third connecting rod 13 is used for installing the worm wheel 4.
Example 3
With reference to fig. 1, compared with the technical solution of embodiment 1 or 2, the nut and screw assembly of this embodiment can be improved as follows: the end of the steering nut 2 adjacent to the first link 11 is defined as a first end 22 and the end of the steering nut 2 adjacent to the third link 13 is defined as a second end 23, said rack 21 being biased towards the first end 22.
Example 4
Compared with any one of the technical schemes in embodiments 1-3, the nut and screw assembly of the embodiment can be improved as follows: an inner nut (not shown in the figure) is arranged in the steering nut 2, the inner nut is sleeved on the outer peripheral wall of the ball screw 1, and a gap is reserved between the steering nut 2 and the inner nut. The both ends of interior nut are connected with the both ends of turning to nut 2 respectively, and when the output shaft applys reaction force to turning to nut 2, turning to nut 2 atress towards radial direction motion, owing to have the clearance between turning to nut 2 and the interior nut, make the interior nut that sets up in turning to nut 2 can not receive radial force, avoid making ball screw 1 atress warp.
Example 5
Referring to fig. 2, an electric power steering apparatus according to this embodiment includes an input shaft 3, a worm wheel 4, a rocker shaft 5, a worm 6, a motor 7, and a nut and screw assembly according to any one of the embodiments 1 to 4, wherein the input shaft 3 is connected to a ball screw 1, the worm wheel 4 is sleeved at one end of the ball screw 1 far away from the input shaft 3, the rocker shaft 5 is engaged with a steering nut 2, one end of the worm 6 is engaged with the worm wheel 4, and the other end of the worm 6 is connected to the motor 7. The motor 7 drives the worm 6 to rotate, the worm 6 drives the worm wheel 4 to rotate, the worm wheel 4 drives the ball screw 1 to rotate, balls on the ball screw 1 and between the steering nuts 2 convert rotary motion into linear motion, and then the steering nuts 2 drive the rocker shafts 5 to move to finish rotation, the worm wheel 4 sets one end of the ball screw 1 far away from the input shaft 3, the worm 6 and the motor 7 are located at one end of the ball screw 1 far away from the input shaft 3, accordingly, the space occupied by the input shaft 3 and one end of the ball screw 1 close to a chassis is greatly reduced, and when the space of the automobile close to the chassis is limited, the normal installation of the electric power-assisted steering device is ensured.
Example 6
With reference to fig. 3, the nut and screw assembly of this embodiment, compared with any one of the technical schemes of embodiments 1 to 5, can be improved as follows: the worm wheel 4 comprises a tooth 41, a web 42 and a shaft 43, the tooth 41 is meshed with the worm 6, the shaft 43 is used for connecting a ball screw, the web 42 is respectively connected with the tooth 41 and the shaft 43, both sides of the tooth 41 and both sides of the shaft 43 are protruded from the web 42, and the height of the shaft 43 protruded from the web 42 is smaller than that of the tooth 41 protruded from the web 42. The weight of the worm wheel 4 is advantageously reduced.
Example 7
With reference to fig. 2, the nut and screw assembly of this embodiment, compared with any one of the technical schemes of embodiments 1 to 6, can be improved as follows: the first link 11 of the ball screw 1 is provided with a first bearing 8, the third link 13 of the ball screw 1 is provided with a second bearing 9, and the second bearing 9 and the shaft portion 43 are abutted against each other. The height of the shaft part 43 protruding from the web plate 42 is smaller than that of the tooth part 41 protruding from the web plate 42, when the second bearing 9 and the shaft part 43 are abutted against each other, the axial distance between the second bearing 9 and the worm wheel 4 is reduced, and the axial distance of the electric power steering device is further reduced, so that the whole electric power steering device is more compact, the whole electric power steering device is light, and the energy conservation and simplification are realized.
The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.
Claims (7)
1. The nut and screw assembly is characterized by comprising a ball screw and a steering nut sleeved on the peripheral wall of the ball screw, one end of the ball screw is used for being connected with an input shaft, the other end of the ball screw is used for installing a worm wheel, one side of the steering nut is provided with a rack, and the rack is biased towards one end, close to the input shaft, of the steering nut.
2. The nut and screw assembly of claim 1, wherein the ball screw includes a first link, a second link, and a third link connected in sequence, the second link having an outer thread on an outer peripheral wall thereof, the steering nut being disposed on the second link, the first link being for connection to an input shaft, the third link being for mounting a worm gear.
3. The nut and lead screw assembly of claim 2, wherein an end of the steering nut adjacent the first link is defined as a first end and an end of the steering nut adjacent the third link is defined as a second end, the rack being biased toward the first end.
4. The nut and screw assembly of claim 1, wherein an inner nut is disposed within the steering nut, the inner nut is disposed around the outer peripheral wall of the ball screw, and a gap is provided between the steering nut and the inner nut.
5. An electric power steering device is characterized by comprising an input shaft, a worm wheel, a rocker shaft, a worm, a motor and the nut and screw assembly according to any one of claims 1-4, wherein the input shaft is connected with a ball screw, the worm wheel is sleeved at one end of the ball screw far away from the input shaft, the rocker shaft is meshed with a steering nut, one end of the worm is meshed with the worm wheel, and the other end of the worm is connected with the motor.
6. The electric power steering apparatus according to claim 5, wherein the worm wheel includes a tooth portion, a web portion and a shaft portion, the tooth portion is engaged with the worm, the shaft portion is used for connecting the ball screw, the web portion is connected with the tooth portion and the shaft portion, both sides of the tooth portion and both sides of the shaft portion are protruded from the web portion, and a height of the shaft portion protruded from the web portion is smaller than a height of the tooth portion protruded from the web portion.
7. An electric power steering apparatus according to claim 6, wherein the first link of the ball screw is provided with a first bearing, and the third link of the ball screw is provided with a second bearing, the second bearing abutting against the shaft portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322265380.9U CN220639999U (en) | 2023-08-22 | 2023-08-22 | Electric power steering device and nut and screw rod assembly thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322265380.9U CN220639999U (en) | 2023-08-22 | 2023-08-22 | Electric power steering device and nut and screw rod assembly thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220639999U true CN220639999U (en) | 2024-03-22 |
Family
ID=90265768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322265380.9U Active CN220639999U (en) | 2023-08-22 | 2023-08-22 | Electric power steering device and nut and screw rod assembly thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220639999U (en) |
-
2023
- 2023-08-22 CN CN202322265380.9U patent/CN220639999U/en active Active
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