CN114368427A - Electric power steering system, torque sensing device and assembling method thereof - Google Patents
Electric power steering system, torque sensing device and assembling method thereof Download PDFInfo
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- CN114368427A CN114368427A CN202011094907.0A CN202011094907A CN114368427A CN 114368427 A CN114368427 A CN 114368427A CN 202011094907 A CN202011094907 A CN 202011094907A CN 114368427 A CN114368427 A CN 114368427A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000004323 axial length Effects 0.000 claims abstract description 16
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
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Classifications
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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
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/0481—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
- Power Steering Mechanism (AREA)
Abstract
The invention provides an electric power steering system, a torque sensing device and an assembling method thereof, wherein the assembling method of the torque sensing device comprises the following steps: providing a first power-assisted shaft connected to a steering wheel to transmit torque of the steering wheel; sleeving a sleeve on one end of the first boosting shaft; the first rotor is sleeved on the sleeve, so that the sleeve is located between the first rotor and the first boosting shaft, wherein the axial length of the first rotor is smaller than that of the sleeve, and the axial length of the sleeve is smaller than that of the first boosting shaft. The invention can fill the gap between the upper rotor and the upper boosting shaft while adopting the existing upper rotor and the upper boosting shaft, thereby reducing the cost and ensuring the connection strength between the upper rotor and the upper boosting shaft.
Description
Technical Field
The present invention relates to an electric power steering system, and more particularly, to an electric power steering system, a torque sensing device and an assembling method thereof.
Background
In the field of electric power steering systems, an upper rotor of a torque sensing device is required to be fixed on an upper power-assisted shaft so as to meet mechanical safety requirements and torque output requirements of a steering wheel. However, although the conventional upper assist shaft is machined from steel, there is a need for pulling up the upper assist shaft. In order to save costs, an existing upper rotor is generally used, however, this will result in a gap of more than 5mm between the upper booster shaft and the upper rotor, thereby affecting the fixation between the upper rotor and the upper booster shaft. Meanwhile, the development of a novel upper rotor with a smaller inner diameter will result in higher cost.
Therefore, how to adopt the existing upper rotor and upper assist shaft and fill up the gap between the upper rotor and the upper assist shaft at the same time to reduce the cost and ensure the connection strength between the upper rotor and the upper assist shaft is a technical problem to be solved in the field.
Disclosure of Invention
The present invention has been made in an effort to overcome the above-mentioned disadvantages of the related art, and the related art described herein provides an electric power steering system, a torque sensing apparatus, and an assembling method thereof, which overcome one or more of the problems due to the limitations and disadvantages of the related art at least to some extent, so that a gap between an upper rotor and an upper assist shaft is filled while using the existing upper rotor and the upper assist shaft, thereby reducing costs and ensuring coupling strength between the upper rotor and the upper assist shaft.
According to an aspect of the present invention, there is provided a method of assembling a torque sensing device, comprising:
providing a first power-assisted shaft connected to a steering wheel to transmit torque of the steering wheel;
sleeving a sleeve on one end of the first boosting shaft;
coupling a first rotor to the sleeve such that the sleeve is located between the first rotor and the first assist shaft,
the axial length of the first rotor is smaller than that of the sleeve, and the axial length of the sleeve is smaller than that of the first boosting shaft.
In some embodiments of the present invention, an inner diameter of the sleeve is smaller than an outer diameter of the first power-assisted shaft, and the sleeve is pushed by the press to be sleeved on one end of the first power-assisted shaft.
In some embodiments of the present invention, the sleeving the sleeve on one end of the first boosting shaft comprises:
heating the sleeve such that the sleeve thermally expands;
sleeving a sleeve pipe subjected to thermal expansion to one end of the first boosting shaft;
cooling the sleeve.
In some embodiments of the invention, the difference in inner diameter of the sleeve before and after thermal expansion is greater than 0.05 mm.
In some embodiments of the invention, said sleeve, after being sleeved to said first power assist shaft, provides an axial compression resistance of more than 4500N and a rotational torque of more than 5 Nm.
In some embodiments of the present invention, the sleeving the sleeve behind one end of the first boosting shaft and before the sleeving the first rotor on the sleeve further comprises:
and welding a sleeve sleeved at one end of the first power-assisted shaft to the first power-assisted shaft.
According to still another aspect of the present invention, there is also provided a torque sensing apparatus comprising:
a first power shaft connected to a steering wheel to transmit torque of the steering wheel;
the sleeve is sleeved at one end of the first boosting shaft;
a first rotor sleeved on the sleeve so that the sleeve is positioned between the first rotor and the first boosting shaft,
the axial length of the first rotor is smaller than that of the sleeve, and the axial length of the sleeve is smaller than that of the first boosting shaft.
In some embodiments of the invention, further comprising:
the second power-assisted shaft is connected with the first power-assisted shaft;
the second rotor is sleeved on the first rotor and the second boosting shaft;
the worm wheel is sleeved on the second boosting shaft.
In some embodiments of the invention, the sleeve is a steel tube.
According to still another aspect of the present invention, there is also provided an electric power steering assist system including:
a booster;
a diverter; and
the torque sensing device as described above.
Compared with the prior art, the invention has the advantages that:
the invention provides the sleeve between the first rotor and the first power-assisted shaft, so that the gap between the upper rotor and the upper power-assisted shaft can be filled while the existing upper rotor and the existing upper power-assisted shaft are adopted, the cost is reduced, and the connection strength between the upper rotor and the upper power-assisted shaft is ensured.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 shows a schematic view of an electric power steering assist system according to an embodiment of the present invention.
FIG. 2 shows a schematic diagram of a torque sensing device according to an embodiment of the invention.
Fig. 3 shows a schematic view of a first booster shaft and a first rotor according to an embodiment of the present invention.
Fig. 4 shows a schematic H-H cross-sectional view of fig. 3.
FIG. 5 illustrates a flow chart of a method of assembling a torque sensing device according to an embodiment of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
Fig. 1 shows a schematic view of an electric power steering assist system according to an embodiment of the present invention. The electric power steering system may include, for example, a steering wheel 110, a torque sensor 130 (the torque sensor 130 includes a steering shaft 120), a booster (including, for example, an assist motor 140 and a decelerator 150), and a steering gear 160.
When a driver steers the steering wheel 110, the torque sensor 130 detects the steering torque of the driver, the vehicle speed sensor detects the driving vehicle speed of the vehicle, the controller of the power motor 140 determines the control current of the power motor 140 according to the steering torque and the driving vehicle speed of the vehicle, and controls the torque and the rotating direction of the power motor 140 based on the control current, the motor torque is amplified by the motor reducer 150 and acts on the steering shaft 120 as the motor assist torque, and the steering torque of the steering wheel 110 and the motor assist torque of the power booster act on the steering gear 160 together to drive the tire 170 to rotate, thereby realizing the steering function. The assist motor 140 is a power unit assembly. The power unit assembly may include a motor assembly (which may be a redundantly designed motor assembly) and a power control unit (control PCB board) provided by the present invention. The power control unit is connected to the motor assembly. The motor assembly includes a motor and a motor shaft.
A torque sensing device according to an embodiment of the present invention will be described with reference to fig. 2. FIG. 2 illustrates a cross-sectional view of a torque sensing device according to an embodiment of the present invention. The torque sensor device 130 is mounted to the electric power steering system shown in fig. 1.
The torque sensing device 130 includes a first assist shaft 11, a first rotor 13, a second rotor 15, a second assist shaft 19, a worm wheel 16, and a worm 14. The first rotor 13 is sleeved outside the first boosting shaft 11, and the second rotor 15 is sleeved outside the first rotor 13 and the second boosting shaft 19. The worm wheel 16 is also sleeved outside the second boosting shaft 19, and the worm wheel 16 is matched with the worm 14.
In the present invention, the first assist shaft 11 and the first rotor 13 may be coupled together in the manner as shown in fig. 3 and 4. Fig. 3 shows a schematic view of a first booster shaft and a first rotor according to an embodiment of the present invention. Fig. 4 shows a schematic H-H cross-sectional view of fig. 3. Specifically, the torque sensing device 130 also includes a sleeve 12. The casing 12 may be a steel casing. The sleeve 12 is sleeved on one end of the first boosting shaft 11 connected with the first rotor 13. The first rotor 13 is sleeved on the sleeve 12, so that the sleeve 12 is located between the first rotor 12 and the first power-assisted shaft 11 to fill a gap between the first rotor 12 and the first power-assisted shaft 11. Specifically, the axial length of the first rotor 13 is smaller than the axial length of the sleeve 12, and the axial length of the sleeve 12 is smaller than the axial length of the first assist shaft 13, thereby improving the coupling strength between the first assist shaft 11 and the first rotor 13 while avoiding an increase in cost.
Referring now to FIG. 5, FIG. 5 illustrates a flow chart of a method of assembling a torque sensing device according to an embodiment of the present invention. The assembly method of the torque sensing device comprises the following steps:
s210: a first power-assist shaft is provided, which is connected to a steering wheel to transmit torque of the steering wheel.
S220: and sleeving a sleeve at one end of the first boosting shaft.
S230: a first rotor is sleeved to the sleeve such that the sleeve is located between the first rotor and the first assist shaft. The axial length of the first rotor is smaller than that of the sleeve, and the axial length of the sleeve is smaller than that of the first boosting shaft.
In one implementation of the assembly method of the torque sensing device, the inner diameter of the sleeve is smaller than the outer diameter of the first assist shaft, and the sleeve is pushed by the press machine to be sleeved on one end of the first assist shaft. In other words, the sleeve and the first power shaft are in interference fit, so that the sleeve is fixed to the first power shaft. Further, the sleeve and the first rotor may also be in an interference fit, so that the first rotor is also fixed to the sleeve, thereby achieving the transmission of torque.
In another implementation of the assembly method of the torque sensing device, the step S220 of sleeving the sleeve on one end of the first boosting shaft includes: heating the sleeve such that the sleeve thermally expands; sleeving a sleeve pipe subjected to thermal expansion to one end of the first boosting shaft; cooling the sleeve, thereby fixing the sleeve to the first assist shaft. In this implementation, in some embodiments of the present invention, the difference between the inner diameters of the sleeve before and after thermal expansion is greater than 0.05mm (0.05mm is the interference between the sleeve and the first booster shaft before thermal expansion of the sleeve, i.e., the initial interference). In this implementation, the sleeve, after being sleeved to the first power assist shaft, provides an axial compression resistance greater than 4500N and a rotational torque greater than 5 Nm. It is verified that the inner diameter difference of the sleeve before and after thermal expansion can be 0.086mm (more than 0.05mm) after the sleeve is heated to 400 ℃, and the sleeve is sleeved on the first boosting shaft to provide 20620N axial compression resistance (more than 4500N of safe axial compression resistance) and provide 191.5Nm rotation torque (more than 5Nm of sliding torque threshold).
In another implementation of the assembly method of the torque sensing device, after the step S220 of sleeving the sleeve on one end of the first boosting shaft and before the step S230 of sleeving the first rotor on the sleeve, the method further includes the following steps: and welding a sleeve sleeved at one end of the first power-assisted shaft to the first power-assisted shaft. Therefore, the first boosting shaft and the sleeve are fixedly connected.
The above description is only illustrative of the present invention, and the present invention is not limited thereto, and the position, number, shape, and increase/decrease of the components are within the protection scope of the present invention without departing from the concept of the present invention.
The advantages of the solution described herein include at least:
the invention provides a sleeve between the first rotor and the first power-assisted shaft, so that the gap between the upper rotor and the upper power-assisted shaft can be filled while the existing upper rotor and the existing upper power-assisted shaft are adopted, the cost is reduced, and the connection strength between the upper rotor and the upper power-assisted shaft is ensured.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (10)
1. A method of assembling a torque sensing device, comprising:
providing a first power-assisted shaft connected to a steering wheel to transmit torque of the steering wheel;
sleeving a sleeve on one end of the first boosting shaft;
coupling a first rotor to the sleeve such that the sleeve is located between the first rotor and the first assist shaft,
the axial length of the first rotor is smaller than that of the sleeve, and the axial length of the sleeve is smaller than that of the first boosting shaft.
2. The method of assembling a torque sensor device according to claim 1, wherein an inner diameter of the sleeve is smaller than an outer diameter of the first assist shaft, and the sleeve is pushed by a press to be fitted over an end of the first assist shaft.
3. The method of assembling a torque sensor device according to claim 1, wherein said fitting a sleeve to an end of said first assist shaft comprises:
heating the sleeve such that the sleeve thermally expands;
sleeving a sleeve pipe subjected to thermal expansion to one end of the first boosting shaft;
cooling the sleeve.
4. A method of assembling a torque transducer assembly according to claim 3 wherein the difference in internal diameter between the sleeve and the sleeve before and after thermal expansion is greater than 0.05 mm.
5. A method of assembling a torque transducer assembly as claimed in claim 3 wherein said sleeve, when fitted over said first booster shaft, provides an axial compression resistance of greater than 4500N and a rotational torque of greater than 5 Nm.
6. The method of assembling a torque sensor device according to claim 1, wherein said sleeving a sleeve behind an end of said first booster shaft and said sleeving a first rotor in front of said sleeve further comprises:
and welding a sleeve sleeved at one end of the first power-assisted shaft to the first power-assisted shaft.
7. A torque sensing device, comprising:
a first power shaft connected to a steering wheel to transmit torque of the steering wheel;
the sleeve is sleeved at one end of the first boosting shaft;
a first rotor sleeved on the sleeve so that the sleeve is positioned between the first rotor and the first boosting shaft,
the axial length of the first rotor is smaller than that of the sleeve, and the axial length of the sleeve is smaller than that of the first boosting shaft.
8. The torque sensing device of claim 7, further comprising:
the second power-assisted shaft is connected with the first power-assisted shaft;
the second rotor is sleeved on the first rotor and the second boosting shaft;
the worm wheel is sleeved on the second boosting shaft.
9. The torque transducer assembly according to claim 7, wherein the sleeve is a steel tube.
10. An electric power steering system characterized by comprising:
a booster;
a diverter; and
a torque sensing device as claimed in any of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011094907.0A CN114368427A (en) | 2020-10-14 | 2020-10-14 | Electric power steering system, torque sensing device and assembling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011094907.0A CN114368427A (en) | 2020-10-14 | 2020-10-14 | Electric power steering system, torque sensing device and assembling method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114368427A true CN114368427A (en) | 2022-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011094907.0A Pending CN114368427A (en) | 2020-10-14 | 2020-10-14 | Electric power steering system, torque sensing device and assembling method thereof |
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| CN (1) | CN114368427A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110011667A1 (en) * | 2009-07-15 | 2011-01-20 | Mando Corporation | Torque angle sensor and electronic power steering apparatus having the same |
| JP2015137038A (en) * | 2014-01-23 | 2015-07-30 | 株式会社デンソー | Electric power steering control device |
| CN206589952U (en) * | 2017-03-30 | 2017-10-27 | 福建船政交通职业学院 | A kind of Worm type electronic power assist steering system |
| CN207664827U (en) * | 2017-12-20 | 2018-07-27 | 华电能源股份有限公司佳木斯热电厂 | A kind of auxiliary tool for high capacity motor plant maintenance |
| CN109733468A (en) * | 2019-01-25 | 2019-05-10 | 江苏大学 | A kind of steering system and method and vehicle |
| CN211391440U (en) * | 2019-09-03 | 2020-09-01 | 耐世特汽车系统（苏州）有限公司 | Electric power steering system and torque sensing device thereof |
| CN211391441U (en) * | 2019-09-09 | 2020-09-01 | 耐世特汽车系统（苏州）有限公司 | Worm wheel and sensor rotor integrated structure for electric power steering |
-
2020
- 2020-10-14 CN CN202011094907.0A patent/CN114368427A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110011667A1 (en) * | 2009-07-15 | 2011-01-20 | Mando Corporation | Torque angle sensor and electronic power steering apparatus having the same |
| JP2015137038A (en) * | 2014-01-23 | 2015-07-30 | 株式会社デンソー | Electric power steering control device |
| CN206589952U (en) * | 2017-03-30 | 2017-10-27 | 福建船政交通职业学院 | A kind of Worm type electronic power assist steering system |
| CN207664827U (en) * | 2017-12-20 | 2018-07-27 | 华电能源股份有限公司佳木斯热电厂 | A kind of auxiliary tool for high capacity motor plant maintenance |
| CN109733468A (en) * | 2019-01-25 | 2019-05-10 | 江苏大学 | A kind of steering system and method and vehicle |
| CN211391440U (en) * | 2019-09-03 | 2020-09-01 | 耐世特汽车系统（苏州）有限公司 | Electric power steering system and torque sensing device thereof |
| CN211391441U (en) * | 2019-09-09 | 2020-09-01 | 耐世特汽车系统（苏州）有限公司 | Worm wheel and sensor rotor integrated structure for electric power steering |
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Application publication date: 20220419 |