CN211391441U - Worm wheel and sensor rotor integrated structure for electric power steering - Google Patents
Worm wheel and sensor rotor integrated structure for electric power steering Download PDFInfo
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- CN211391441U CN211391441U CN201921487036.1U CN201921487036U CN211391441U CN 211391441 U CN211391441 U CN 211391441U CN 201921487036 U CN201921487036 U CN 201921487036U CN 211391441 U CN211391441 U CN 211391441U
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Abstract
The utility model provides a worm wheel and sensor rotor integrated configuration for electric power assisted steering, the structure includes helping hand axle, first sensor rotor and worm wheel, first sensor rotor with the worm wheel all overlaps and locates the outside of helping hand axle, the worm wheel includes the worm wheel body and encircles the teeth of a cogwheel that the worm wheel body set up, the worm wheel body with first sensor rotor integrated into one piece. The utility model discloses a set up first sensor rotor and worm wheel integrated into one piece, reduced helping hand mechanical assembly size, reduced the axial length of helping hand axle, need not additionally to increase the installation procedure of worm wheel and the installation procedure of first sensor rotor to the joint strength and the stability of worm wheel and first sensor rotor and helping hand axle have been improved.
Description
Technical Field
The utility model relates to an electric power assisted steering technical field, concretely relates to worm wheel and sensor rotor integrated configuration for electric power assisted steering.
Background
An Electric Power Steering (EPS) is a Power Steering system that directly relies on a motor to provide an assist torque, and has many advantages compared to a conventional hydraulic Power Steering system, and thus is increasingly widely used. The electric power steering system mainly comprises a torque sensor, a vehicle speed sensor, a motor, a speed reducing mechanism, an electronic control unit and the like, wherein the speed reducing mechanism comprises a worm and gear mechanism.
Fig. 1 is a schematic diagram illustrating a position of a worm wheel and a torque sensor in an electric power steering system in the prior art. The torque sensor comprises an upper sensor rotor 102 and a lower sensor rotor 101, the upper sensor rotor 102 is sleeved outside the upper boosting shaft 106, and the lower sensor rotor 101 is sleeved outside the upper sensor rotor 102 and the lower sensor rotor 105. The worm wheel 103 is also sleeved outside the lower boosting shaft 105, and the worm wheel 103 is matched with the worm 104. As can be seen from fig. 1, in the prior art, the lower sensor rotor 101 is embedded in the lower booster shaft 105, and there is a large distance between the lower surface of the lower sensor rotor 101 and the upper surface of the worm wheel 103, so that the height of the whole structure in the vertical direction is large, which results in a large size of the booster mechanical assembly, especially the booster shaft needs to be set long. The excessive size may cause difficulty in arrangement and installation in the vehicle. In addition, in the power-assisted mechanical assembly adopting the structure, the force for keeping the shaft and the worm wheel and the shaft and the lower rotor of the sensor fixed may not meet the requirement, so that the fault of connection and separation can be caused.
In addition, in the prior art, the worm wheel and the torque sensor are both embedded and press-fitted on the power-assisted shaft or fixed on the power-assisted shaft by welding, so that an additional fixing step, such as a worm wheel mounting step and a sensor lower rotor mounting step, is required in the manufacturing process, and the process flow is too complicated and the assembly time is too long.
SUMMERY OF THE UTILITY MODEL
To the problem among the prior art, the utility model aims to provide a worm wheel and sensor rotor integrated configuration for electric power steering sets up first sensor rotor and worm wheel integrated into one piece, reduces helping hand mechanical assembly size.
An embodiment of the utility model provides a worm wheel and sensor rotor integrated configuration for electric power assisted steering, including helping hand axle, first sensor rotor and worm wheel, first sensor rotor with the worm wheel all overlaps and locates the outside of helping hand axle, the worm wheel includes the worm wheel body and encircles the teeth of a cogwheel that the worm wheel body set up, the worm wheel body with first sensor rotor integrated into one piece.
Optionally, the worm gear body and the first sensor rotor are both made of nylon material.
Optionally, the worm gear body and the first sensor rotor are fixed with the power shaft by integral injection molding.
Optionally, the first sensor rotor is a rotor of a torque sensor.
Optionally, the first sensor rotor is a rotor of a position sensor.
Optionally, the first sensor rotor acts as both a torque sensor and a position sensor rotor.
Optionally, the structure further comprises a position sensor gear cooperating with the first sensor rotor.
Optionally, the structure still includes second sensor rotor, the helping hand axle includes first helping hand axle and second helping hand axle, second sensor rotor cover is located the outside of second helping hand axle, the worm wheel cover is located the outside of first helping hand axle.
Optionally, the structure further comprises a sensor probe, the first sensor rotor is located between the worm gear and the second sensor rotor, and the first sensor rotor at least partially surrounds the second sensor rotor, the sensor probe cooperating with a side of the first sensor rotor.
Optionally, the structure further comprises a sensor probe, the first sensor rotor is formed inside the worm gear body, the first sensor rotor comprises a rotor magnet, and the sensor probe is located between the first sensor rotor and the second sensor rotor.
The utility model provides a worm wheel and sensor rotor integrated configuration for electronic power assisted steering has following advantage:
the utility model reduces the height from the first sensor rotor to the worm wheel by integrally forming the worm wheel and the first sensor rotor, thereby reducing the size of the power-assisted mechanical assembly, reducing the axial length of the power-assisted shaft matched with the first sensor rotor and the worm wheel, and more conveniently arranging and installing the power-assisted mechanical assembly adopting the structure in a vehicle; further, the utility model discloses in can keep being connected of worm wheel and first sensor rotor and helping hand axle through injection moulding with the direct injection moulding of worm wheel and first sensor rotor, need not the installation step of extra increase worm wheel and the installation step of first sensor rotor to the joint strength and the stability of worm wheel and first sensor rotor and helping hand axle have been improved, thereby the structural stability of electric power steering system's helping hand mechanical assembly has been improved, be applicable to extensive popularization and application.
Drawings
Other features, objects and advantages of the invention will become more apparent from a reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the position of a worm gear and a sensor in an electric power steering system of the prior art;
fig. 2 is a schematic view of a worm wheel and sensor rotor integrated structure for electric power steering according to a first embodiment of the present invention;
fig. 3 is a schematic view of a worm wheel and sensor rotor integrated structure for electric power steering according to a second embodiment of the present invention;
fig. 4 is a schematic view of a worm wheel and sensor rotor integrated structure for electric power steering according to a third embodiment of the present invention;
fig. 5 is a schematic view of an integrated structure of a worm wheel and a sensor rotor for electric power steering according to a fourth embodiment of the present invention.
Reference numerals:
Prior Art
101 sensor lower rotor 104 worm
102 sensor upper rotor 105 lower booster shaft
103 worm gear 106 upper booster shaft
The utility model discloses
1 first sensor rotor 5 first booster shaft
11 first sensor rotor magnet 6 second booster shaft
2 second sensor rotor 7 sensor probe
3 worm wheel 8 shell
31 worm gear body 9 bearing
32 teeth 10 position sensor gear
4 Worm
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 embodiments 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 same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
In order to solve the technical problem in the prior art, the utility model provides a worm wheel and sensor rotor integrated configuration for electric power steering through setting up worm wheel and first sensor rotor integrated into one piece, has reduced the height from first sensor rotor to the worm wheel to helping hand mechanical assembly size has been reduced, and reduced the axial length with first sensor rotor and worm wheel matched with helping hand axle, can arrange and install the helping hand mechanical assembly that adopts this structure in the vehicle more conveniently. The first sensor rotor may be a rotor of a torque sensor or a rotor of a position sensor.
Fig. 2 is a schematic diagram of an integrated structure of a worm wheel and a sensor rotor for electric power steering according to a first embodiment of the present invention. This integrated configuration includes helping hand axle, first sensor rotor 1 and worm wheel 3, first sensor rotor 1 with worm wheel 3 all overlaps and locates the outside of helping hand axle, worm wheel 3 includes worm wheel body 31 and encircles the teeth of a cogwheel 32 that worm wheel body 31 set up, worm wheel body 31 with 1 integrated into one piece of first sensor rotor. The worm wheel 3 is matched with the worm 4, and the worm 4 is arranged on the shell 8. The worm wheel body 31 of the worm wheel 3 is rotatably connected to the housing 8 via a bearing 9.
In this embodiment, the assist shaft includes a first assist shaft 5 and a second assist shaft 6. The worm wheel 3 is sleeved outside the first boosting shaft 5, the second sensor rotor 2 is further sleeved outside the second boosting shaft 5, and the first sensor rotor 1 is sleeved outside the second boosting shaft 5 and the first sensor rotor 1. Since the worm wheel body 31 and the first sensor rotor 1 are integrally formed, the height of the booster mechanical assembly in the up-down direction in fig. 2 is reduced, and the length of the booster shaft that is engaged with the worm wheel body 31 and the first sensor rotor 1 is reduced. Meanwhile, the integrally formed worm wheel body 31 and the first sensor rotor 1 enhance the continuous connection length with the assistance shaft compared with the prior art, and the loosening torque is improved.
In this embodiment, the worm wheel body 31 and the first sensor rotor 1 are both made of nylon material. The nylon material can adopt the existing nylon material formula, for example, nylon 66 plus 25% glass fiber material, has the characteristics of high hardness, high temperature resistance and wear resistance, and is more suitable for being applied to products with requirements on impact resistance and high strength. And the gear teeth 32 of the worm wheel 3 can be made of nylon 66 material. In this embodiment, the worm wheel body 31 is made of nylon material, so that the influence of the worm wheel made of metal on the signal of the torque sensor in the prior art can be eliminated, and the accuracy and stability of signal detection and transmission of the torque sensor are improved. In other alternative embodiments, the worm wheel body 31 and the first sensor rotor 1 may be made of other types of materials, such as plastic materials, and the like, and all fall within the protection scope of the present invention.
In this embodiment, the worm wheel body 31 and the first sensor rotor 1 are fixed to the assist shaft by integral injection molding. For example, the assist shaft is set in advance in a mold for integral injection molding, and then a nylon material is injection-molded at high pressure to integrally form an integrally molded piece of the worm wheel body 31 and the first sensor rotor 1 fixed to the outside of the assist shaft. Through integral injection molding, the steps of fixing and assembling the worm wheel and the sensor rotor in the preparation process in the prior art are reduced, the preparation process flow of the power-assisted mechanical assembly is shortened, the manufacturing time is saved, and the manufacturing cost is reduced. In addition, worm wheel body 31 and first sensor rotor 1 are through integrative injection moulding and helping hand axle snap-on, have improved between worm wheel body 31 and the helping hand axle, the joint strength between first sensor rotor 1 and the helping hand axle, have improved overall structure intensity and stability. However, the utility model discloses be not limited to this kind of fixed mode, in other alternative embodiments, worm wheel body 31 and first sensor rotor 1's integrated into one piece spare can be connected with the helping hand axle through inlaying and establishing or welded mode, and in the preparation process, worm wheel body 31 and first sensor rotor 1 can adopt an assembly step to assemble on the helping hand axle, compare in prior art also can shorten process flow equally, save manufacturing time.
In this embodiment, the first sensor rotor 1 is a rotor of a torque sensor. The torque sensor further comprises a sensor probe 7, the first sensor rotor 1 is located between the worm wheel 3 and the second sensor rotor 2, the first sensor rotor 1 at least partially surrounds the second sensor rotor 2, the sensor probe 7 is matched with the side face of the first sensor rotor 1, and an angle measurement result of the lower rotor 101 of the torque sensor, which rotates, can be read from the sensor probe 7.
Fig. 3 is a schematic diagram of a worm wheel and sensor rotor integrated structure for electric power steering according to a second embodiment of the present invention. This embodiment differs from the first embodiment in that: first sensor rotor 1 is regarded as torque sensor and position sensor's rotor simultaneously, integrated structure still includes position sensor gear 10, position sensor gear 10 cooperatees with the lower part of first sensor rotor 1, just position sensor gear 10 sets up in the worm wheel body 31 top of worm wheel 3. The torque sensor and the position sensor further comprise a sensor probe 7, the first sensor rotor 1 is located between the worm wheel 3 and the second sensor rotor 2, the first sensor rotor 1 at least partially surrounds the second sensor rotor 2, the sensor probe 7 is matched with the side face of the first sensor rotor 1, and a measurement result of the torque sensor and a measurement result of the position sensor can be read from the sensor probe 7.
Fig. 4 is a schematic diagram of a worm wheel and sensor rotor integrated structure for electric power steering according to a third embodiment of the present invention. This embodiment differs from the second embodiment in that: the position of the position sensor gear 10 is different. In this embodiment, the position sensor gear 10 is fitted to the upper portion of the first sensor rotor 1.
Fig. 2-4 show the structure that the sensor rotor in the utility model is applied to different grade type sensor. In practical application, the sensor rotor can regard as torque sensor's rotor, also can regard as position sensor's rotor, also can regard as torque sensor and position sensor's rotor simultaneously, all belong to the utility model discloses an within the scope of protection.
Fig. 5 is a schematic view of an integrated structure of a worm wheel and a sensor rotor for electric power steering according to a fourth embodiment of the present invention. This embodiment differs from the first embodiment in that: the first sensor rotor 1 is formed inside the worm wheel body 31, the first sensor rotor 1 includes a rotor magnet 11, the sensor probe 7 is located between the first sensor rotor 1 and the second sensor rotor 2, and the sensor probe 7 is disposed opposite to the rotor magnet 11. The axial height of the power-assisted mechanical assembly can be further reduced by the aid of the design.
In summary, compared with the prior art, the utility model discloses a set up worm wheel and first sensor rotor integrated into one piece, reduced the height from first sensor rotor to worm wheel to reduce helping hand mechanical assembly size, and reduced the axial length of helping hand axle with first sensor rotor and worm wheel matched with, can arrange and install the helping hand mechanical assembly that adopts this structure in the vehicle more conveniently; further, the utility model discloses in can keep being connected of worm wheel and first sensor rotor and helping hand axle through injection moulding with the direct injection moulding of worm wheel and first sensor rotor, need not the installation step of extra increase worm wheel and the installation step of first sensor rotor to the joint strength and the stability of worm wheel and first sensor rotor and helping hand axle have been improved, thereby the structural stability of electric power steering system's helping hand mechanical assembly has been improved, be applicable to extensive popularization and application.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (10)
1. The utility model provides a worm wheel and sensor rotor integrated configuration for electric power assisted steering, its characterized in that, includes helping hand axle, first sensor rotor (1) and worm wheel (3), first sensor rotor (1) with worm wheel (3) are all located the outside of helping hand axle, worm wheel (3) include worm wheel body (31) and encircle the teeth of a cogwheel (32) that worm wheel body (31) set up, worm wheel body (31) with first sensor rotor (1) integrated into one piece.
2. The worm wheel and sensor rotor integrated structure for electric power steering according to claim 1, wherein the worm wheel body (31) and the first sensor rotor (1) are both made of nylon material.
3. The worm wheel and sensor rotor integrated structure for electric power steering according to claim 1, wherein the worm wheel body (31) and the first sensor rotor (1) are fixed to the assist shaft by integral injection molding.
4. The worm-wheel and sensor rotor integrated structure for electric power steering according to claim 1, characterized in that the first sensor rotor (1) is a rotor of a torque sensor.
5. The worm-wheel and sensor rotor integrated structure for electric power steering according to claim 1, characterized in that the first sensor rotor (1) is a rotor of a position sensor.
6. The worm-wheel and sensor rotor integrated structure for electric power steering according to claim 1, characterized in that the first sensor rotor (1) acts as both a torque sensor and a position sensor rotor.
7. The worm-wheel and sensor rotor integrated structure for electric power steering according to claim 5 or 6, characterized in that the structure further comprises a position sensor gear (10), the position sensor gear (10) cooperating with the first sensor rotor (1).
8. The worm wheel and sensor rotor integrated structure for electric power steering according to claim 1, wherein the structure further comprises a second sensor rotor (2), the assist shaft comprises a first assist shaft (5) and a second assist shaft (6), the second sensor rotor (2) is sleeved on the outside of the second assist shaft (6), and the worm wheel (3) is sleeved on the outside of the first assist shaft (5).
9. The integrated worm-wheel and sensor rotor structure for electric power steering according to claim 8, characterized in that the structure further comprises a sensor probe (7), the first sensor rotor (1) being located between the worm wheel (3) and the second sensor rotor (2), and the first sensor rotor (1) at least partially surrounding the second sensor rotor (2), the sensor probe (7) cooperating with a side of the first sensor rotor (1).
10. The worm-wheel and sensor rotor integrated structure for electric power steering according to claim 8, characterized in that the structure further comprises a sensor probe (7), the first sensor rotor (1) is formed inside the worm-wheel body (31), the first sensor rotor (1) comprises a rotor magnet (11), the sensor probe (7) is located between the first sensor rotor (1) and the second sensor rotor (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921487036.1U CN211391441U (en) | 2019-09-09 | 2019-09-09 | Worm wheel and sensor rotor integrated structure for electric power steering |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921487036.1U CN211391441U (en) | 2019-09-09 | 2019-09-09 | Worm wheel and sensor rotor integrated structure for electric power steering |
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| CN211391441U true CN211391441U (en) | 2020-09-01 |
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| CN201921487036.1U Active CN211391441U (en) | 2019-09-09 | 2019-09-09 | Worm wheel and sensor rotor integrated structure for electric power steering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114368427A (en) * | 2020-10-14 | 2022-04-19 | 耐世特汽车系统（苏州）有限公司 | Electric power steering system, torque sensing device and assembling method thereof |
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2019
- 2019-09-09 CN CN201921487036.1U patent/CN211391441U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114368427A (en) * | 2020-10-14 | 2022-04-19 | 耐世特汽车系统（苏州）有限公司 | Electric power steering system, torque sensing device and assembling method thereof |
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