CN109533015B - Output shaft fixing structure of automobile electric steering speed reducing mechanism - Google Patents
Output shaft fixing structure of automobile electric steering speed reducing mechanism Download PDFInfo
- Publication number
- CN109533015B CN109533015B CN201811581462.1A CN201811581462A CN109533015B CN 109533015 B CN109533015 B CN 109533015B CN 201811581462 A CN201811581462 A CN 201811581462A CN 109533015 B CN109533015 B CN 109533015B
- Authority
- CN
- China
- Prior art keywords
- output shaft
- bearing
- side bearing
- worm gear
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 49
- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 44
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 abstract description 7
- 230000005284 excitation Effects 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0442—Conversion of rotational into longitudinal movement
- B62D5/0454—Worm gears
-
- 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
- B62D5/0403—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 constructional features, e.g. common housing for motor and gear box
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Gear Transmission (AREA)
- Power Steering Mechanism (AREA)
Abstract
The invention provides an output shaft fixing structure of an automobile electric steering speed reducing mechanism, which can eliminate axial clearance and solve the problem of abnormal sound. The fixing structure comprises an output shaft worm gear, a worm gear box shell, an output shaft and a bearing supporting seat, wherein an input side bearing and an output side bearing are respectively arranged on two sides of the output shaft worm gear, the bearing supporting seat is fixedly connected with the worm gear box shell, an outer ring of the input side bearing is in interference press-fitting in the bearing supporting seat, an inner ring of the input side bearing is in interference fit with the output shaft, an outer ring of the output side bearing is in interference press-fitting in the worm gear box shell, an inner ring of the output side bearing is in clearance fit with the output shaft, the outer side of the inner ring of the output side bearing is fixed with the output shaft through a retaining ring for the bearing, a metal reed is arranged between the inner side of the inner ring of the output side bearing and the output shaft worm gear, the inner ring of the metal reed is in interference fit with.
Description
Technical Field
The invention relates to the technical field of automobile steering mechanisms, in particular to an output shaft fixing structure of an automobile electric steering speed reducing mechanism.
Background
When an electric power steering type automobile runs on a bumpy road (such as a cobblestone road, a deceleration strip, a bad road and the like), tires frequently swing left and right under the high-frequency excitation of the ground, the excitation is transmitted to a speed reducing mechanism through mechanical components such as a steering gear tie rod, an intermediate shaft and the like, internal mechanical components can generate vibration, impact, swing and other abnormalities under the high-frequency excitation, the vibration and the noise of an automobile steering system are caused, the comfort of the whole automobile is influenced, and the excitation transmission is shown in fig. 1. The prior art generally fixes the output shaft worm wheel through an upper ball bearing and a lower ball bearing and eliminates axial clearance to reduce noise generated by impact between parts. However, due to the assembly clearance of the mechanical parts of the output shaft assembly of the steering and speed reducing mechanism, the abrasion in the use process and the like, the vibration and the noise still occur after the steering and speed reducing mechanism is used for a period of time, and the customer experience is influenced. Chinese patent CN201410407195 discloses an abnormal sound preventing structure for a worm gear bearing seat of an electric power steering column, namely, by arranging a wave spring between the bearing support seat and the speed reducer housing, so as to eliminate the clearance fit between the bearing support seat and the speed reducer housing, thereby avoiding the noise problem inside the electric power steering column when the whole vehicle runs on a rugged bumpy road surface. However, such an abnormal sound prevention device using the wave spring is complicated in assembly, and more importantly, since the wave spring is in a compressed state after being assembled, it is known that the elastic restoring force of the spring in the compressed state for a long time is greatly lost and thus is not effective. In addition, the rubber gasket is adopted at the support of the bearing, and the like, so that the same problem exists, and the rubber gasket in a compressed state for a long time is difficult to maintain enough pretightening force and is not enough to ensure the effect of eliminating abnormal sound.
Disclosure of Invention
The invention aims to provide an output shaft fixing structure of an automobile electric steering speed reducing mechanism, which can eliminate axial clearance and solve the problem of abnormal sound caused by the clearance between mechanical parts.
The output shaft fixing structure of the automobile electric steering speed reducing mechanism comprises an output shaft worm gear, a worm gear box shell, an output shaft and a bearing support seat, wherein an input side bearing and an output side bearing are respectively arranged on two sides of the output shaft worm gear, the bearing support seat is fixedly connected with the worm gear box shell, an outer ring of the input side bearing is in interference press fit in the bearing support seat, an inner ring of the input side bearing is in interference fit with the output shaft, an outer ring of the output side bearing is in interference press fit in the worm gear box shell, an inner ring of the output side bearing is in clearance fit with the output shaft, the outer side of the inner ring of the output side bearing is fixed with the output shaft through a bearing retainer ring, a metal reed is arranged between the inner side of the inner ring of the output side bearing and the output shaft worm gear, the inner ring of the metal reed is in interference fit with the output shaft, and the radial section between the inner An inclined surface and a section of lapping surface.
The invention relates to an output shaft fixing structure of an automobile electric steering speed reducing mechanism, wherein an input side bearing and an output side bearing are respectively arranged on two sides of a worm gear of an output shaft, and the assembling process and the working principle are as follows: the output side bearing is pre-pressed in a corresponding bearing hole in the worm gear case shell in an interference fit manner; the outer ring of the input side bearing is in interference press-fit in the bearing support seat, the inner ring is in interference press-fit on the output shaft, and the inner ring and the outer ring of the input side bearing are in interference press-fit, so that the clearance of the bearing can be reduced while the input side of the worm wheel of the output shaft is fixed; then the metal reed is arranged on the output side of the output shaft, the output shaft assembly of which the input side bearing is well pressed is arranged in the worm gear case shell, and the inner ring of the output side bearing is in clearance fit with the output shaft, so that the assembly is convenient, the excessive abrasion of the bearing caused by the coaxial error of the input side bearing and the output side bearing is avoided, and the service life is prolonged; finally, the bearing support seat is fixed on the worm gear box shell through a fastening bolt, and the bearing is tightly clamped at the lower end of the inner ring of the output side bearing by a retainer ring, at the moment, the input side bearing and the output side bearing are completely fixed, the output shaft can be reliably fixed when the worm gear rotates, the output shaft is prevented from swinging, and the working stability and reliability of the system are improved; the metal reed arranged between the inner side of the inner ring of the output side bearing and the output shaft worm wheel is compressed after the assembly is finished, and because the rigidity of the metal reed and the interference fit between the inner ring of the metal reed and the output shaft are kept, meanwhile, the outer ring of the metal reed is provided with a lap joint surface, the lap joint surface of the top of the inner ring of the metal reed and the outer ring of the metal reed is respectively subjected to the axial force of the bearing and the worm wheel of the output shaft, the inclined surface in the metal reed is subjected to pressure, therefore, the metal reed can continuously keep certain pre-pressure, and the pre-pressure can eliminate the axial clearance of the bearings at the two sides of the output shaft worm wheel because the bearings at the two sides of the output shaft worm wheel are fixed, after the bearing is durably worn to cause the increase of the clearance, the pre-pressure is released, the axial clearance is further eliminated, the impact abnormal sound between parts caused by reverse impact is prevented, the comfort of the whole automobile is improved, and the customer satisfaction is improved.
Further, in a preferred embodiment, the inclined surface is inclined toward the input side, and the inclined surface and the overlapping surface are in rounded transition. According to the metal reed arrangement structure, after assembly, the inner ring of the metal reed can be firmly clamped at the shaft shoulder of the output shaft worm wheel connected with the output shaft, so that the stress structure of the metal reed is reliable, and sufficient pre-pressure is generated.
Further, as another preferred embodiment, the inclined surface is an S-shaped combined arc surface. Such a metal spring structure can provide pre-stress more easily, but has a high requirement on the material of the metal spring.
Furthermore, one end of the inclined surface is connected with the lapping surface, and the other end of the inclined surface is connected with a second lapping surface. Therefore, the upper side and the lower side of the metal reed are both provided with the lapping surfaces, so that the compactness of the structure can be improved.
Further, the distance from the joint of the inclined surface and the lapping surface to the peripheral wall of the output shaft is smaller than the distance from the outer ring of the bearing retainer ring to the peripheral wall of the output shaft. Therefore, the prepressing force generated by the metal reed can be ensured to act in the fastening position of the bearing, and the prepressing force can be ensured to act.
Further, the bearing supporting seat is connected with the worm gear box shell through a bolt. The bearing support seat and the worm gear case shell are fastened by bolts, and due to the existence of the pre-pressure of the metal reed, the metal reed can be further compressed by further screwing the bolts after being used for a long time, so that the purpose of eliminating noise is achieved.
Drawings
Fig. 1 is a schematic diagram of excitation transmission of an automobile electric steering speed reducing mechanism system.
Fig. 2 is a schematic cross-sectional structure of the present invention.
Fig. 3 is an enlarged schematic view of fig. 2 at B.
Fig. 4 is a schematic cross-sectional view of a metal reed according to embodiment 1 of the present invention.
Fig. 5 is a schematic cross-sectional view of a metal reed according to embodiment 2 of the present invention.
Fig. 6 is a schematic cross-sectional view of a metal reed according to embodiment 3 of the present invention.
In which the figures are as follows: a1, vehicle wheels; a2, a steering gear; a3, intermediate shaft; a4, a reducer assembly; 1. an output shaft worm gear; 2. a worm gear case housing; 3. an output shaft; 4. a bearing support seat; 5. an input side bearing; 6. an output side bearing; 7. a retainer ring for a bearing; 8. a metal reed; 81. an inclined surface; 82. a lapping surface; 83. a second faying surface; 9. and (4) bolts.
Detailed Description
The following describes embodiments of the present invention, such as shapes and structures of respective members, mutual positions and connection relationships between respective portions, and actions and operation principles of the respective portions, in further detail, with reference to the accompanying drawings.
Referring to fig. 2-4, the output shaft fixing structure of the electric steering speed reducing mechanism of the automobile of the invention comprises an output shaft worm wheel 1, a worm gear case shell 2, an output shaft 3 and a bearing support seat 4, wherein an input side bearing 5 and an output side bearing 6 are respectively arranged on two sides of the output shaft worm wheel 1, the bearing support seat 4 is tightly connected with the worm gear case shell 2, an outer ring of the input side bearing 5 is press-fitted in the bearing support seat 4 in an interference manner, an inner ring of the input side bearing 5 is press-fitted in the output shaft 3 in an interference manner, an outer ring of the output side bearing 6 is press-fitted in the worm gear case shell 2 in an interference manner, an inner ring of the output side bearing 6 is in clearance fit with the output shaft 3, an outer side of the inner ring of the output side bearing 6 is fixed with the output shaft 3 through a bearing retainer ring 7, a metal reed 8 is, the radial section between the inner ring and the outer ring of the metal spring 8 comprises a section of inclined surface 81 for generating a preload and a section of overlapping surface 82.
The invention relates to an output shaft fixing structure of an automobile electric steering speed reducing mechanism, wherein an input side bearing 5 and an output side bearing 6 are respectively arranged on two sides of a worm wheel 1 of an output shaft, and the assembling process and the working principle are as follows: the output side bearing 6 is pre-interference press-mounted in a corresponding bearing hole in the worm gear box shell 2; an outer ring of an input side bearing 5 is in interference press-fit in a bearing support seat 4, an inner ring of the input side bearing 5 is in interference press-fit on an output shaft 3, and an inner ring and an outer ring of the input side bearing 5 are in interference press-fit, so that the clearance of the bearing can be reduced while the input side of an output shaft worm wheel 1 is fixed; then the metal reed 8 is arranged on the output side of the output shaft 3, the output shaft assembly of the input side bearing 5 which is well pressed is arranged in the worm gear case shell 2, the inner ring of the output side bearing 6 is in clearance fit with the output shaft 3, the assembly is convenient, the excessive abrasion of the bearing caused by the coaxial error of the input side bearing 5 and the output side bearing 6 can be avoided, and the service life is prolonged; finally, the bearing support seat 4 is fixed on the worm gear case shell 2 through a fastening bolt 9, and the bearing is clamped at the lower end of the inner ring of the output side bearing 6 by a retainer ring 7, at the moment, the input side bearing 5 and the output side bearing 6 are completely fixed, the output shaft 3 can be reliably fixed when the worm gear rotates, the output shaft 3 is prevented from swinging, and the working stability and reliability of the system are improved; the metal reed 8 arranged between the inner side of the inner ring of the output side bearing 6 and the output shaft worm wheel 1 is compressed after assembly, the metal reed 8 is compressed after assembly, the lapping surface 82 of the outer ring and the lapping surface 82 of the inner ring of the metal reed 8 are respectively subjected to axial force of the output side bearing 6 and the output shaft worm wheel 1 due to the rigidity of the metal reed 8 and the interference fit of the inner ring of the metal reed 8 and the output shaft 3, and the inclined surface 81 in the metal reed 8 is subjected to pressure, so that the metal reed 8 can continuously keep certain pre-pressure, and the pre-pressure can eliminate the axial play of the bearings at two sides of the output shaft worm wheel 1 due to the fact that the bearings at two sides of the output shaft worm wheel 1 are fixed, and after the bearing is increased due to durable wear, the pre-pressure is released, the axial play is further eliminated, and the impact abnormal sound between components due to reverse impact, the comfort of the whole vehicle is improved, and the customer satisfaction is improved.
The distance from the connection point of the inclined surface 81 and the land surface 82 to the peripheral wall of the output shaft 3 is smaller than the distance from the outer ring of the bearing retainer 7 to the peripheral wall of the output shaft 3. Therefore, the prepressing force generated by the metal reed 8 can be ensured to act in the fastening position of the bearing, and the prepressing force can be ensured to act. The bearing support seat 4 and the worm gear case shell 2 adopt a bolt fastening mode, and due to the existence of the pre-pressure of the metal reed 8, the metal reed 8 can be further compressed by further screwing the bolt 9 after being used for a long time, so that the purpose of eliminating noise is achieved.
Example 1:
the metal reed 8 may have various configurations, and as one of preferred embodiments, the inclined surface 81 is inclined toward the input side, and the inclined surface 81 and the land surface 82 are rounded, as shown in fig. 4. According to the arrangement structure of the metal reed 8, after assembly, the inner ring of the metal reed 8 can be firmly clamped at the shaft shoulder where the output shaft worm wheel 1 is connected with the output shaft 3, so that the stress structure of the metal reed 8 is reliable, and sufficient pre-pressure is generated.
Example 2:
unlike embodiment 1, the inclined surface 81 is a combined arc surface of an S shape, and its structure is shown in fig. 5. Such a metal spring 8 structure can provide pre-stress more easily, but the requirement for the material of the metal spring 8 is high.
Example 3:
unlike both embodiments 1 and 2, the inclined surface 81 has one end connected to the lapping surface 82 and the other end connected to the second lapping surface 83. Therefore, the upper side and the lower side of the metal reed 8 are provided with the lapping surfaces, so that the compactness of the structure can be improved.
Claims (6)
1. An output shaft fixing structure of an automobile electric steering speed reducing mechanism is characterized by comprising an output shaft worm gear, a worm gear box shell, an output shaft and a bearing support seat, wherein an input side bearing and an output side bearing are respectively arranged on two sides of the output shaft worm gear, the bearing support seat is fixedly connected with the worm gear box shell, an outer ring of the input side bearing is in interference press-fit in the bearing support seat, an inner ring of the input side bearing is in interference fit with the output shaft, an outer ring of the output side bearing is in interference press-fit in the worm gear box shell, an inner ring of the output side bearing is in clearance fit with the output shaft, the outer side of the inner ring of the output side bearing is fixed with the output shaft through a retaining ring for a bearing, a metal reed is arranged between the inner side of the inner ring of the output side bearing and the output shaft worm, the radial section between the inner ring and the outer ring of the metal reed at least comprises an inclined surface for generating pretightening force and a lapping surface, and the distance from the joint of the inclined surface and the lapping surface to the peripheral wall of the output shaft is smaller than the distance from the outer ring of the retaining ring for the bearing to the peripheral wall of the output shaft.
2. The output shaft fixing structure of an electric steering speed reducing mechanism of an automobile according to claim 1, wherein the inclined surface is inclined toward the input side, and the inclined surface is rounded in transition with the land surface.
3. The output shaft fixing structure of an electric steering speed reducing mechanism of an automobile according to claim 1, wherein the inclined surface is an S-shaped combined arc surface.
4. The output shaft fixing structure of the electric steering reduction mechanism of the automobile according to claim 1, 2 or 3, wherein one end of the inclined surface is connected to the land surface, and the other end is connected to a second land surface.
5. The output shaft fixing structure of the automotive electric steering reduction mechanism according to claim 1, 2 or 3, characterized in that the surface of the metal reed is a smooth surface.
6. The output shaft fixing structure of the electric steering speed reducing mechanism of the automobile as claimed in claim 5, wherein the bearing support base is connected with the worm gear case housing by a bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811581462.1A CN109533015B (en) | 2018-12-24 | 2018-12-24 | Output shaft fixing structure of automobile electric steering speed reducing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811581462.1A CN109533015B (en) | 2018-12-24 | 2018-12-24 | Output shaft fixing structure of automobile electric steering speed reducing mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109533015A CN109533015A (en) | 2019-03-29 |
| CN109533015B true CN109533015B (en) | 2021-06-29 |
Family
ID=65856778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811581462.1A Active CN109533015B (en) | 2018-12-24 | 2018-12-24 | Output shaft fixing structure of automobile electric steering speed reducing mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109533015B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004306881A (en) * | 2003-04-10 | 2004-11-04 | Unisia Jkc Steering System Co Ltd | Electric power steering device |
| CN104024087A (en) * | 2012-10-29 | 2014-09-03 | 日本精工株式会社 | Electric power-steering device |
| CN104149841A (en) * | 2014-08-18 | 2014-11-19 | 安徽江淮汽车股份有限公司 | Abnormal sound prevention structure for worm wheel bearing seat of electric power steering column |
| CN108639144A (en) * | 2018-04-18 | 2018-10-12 | 奇瑞汽车股份有限公司 | A kind of electric steering column output shaft fixing device |
| CN208007050U (en) * | 2018-01-03 | 2018-10-26 | 博世汽车转向系统管理（上海）有限公司 | Electric boosting steering system and its driving unit, bearing spider |
-
2018
- 2018-12-24 CN CN201811581462.1A patent/CN109533015B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004306881A (en) * | 2003-04-10 | 2004-11-04 | Unisia Jkc Steering System Co Ltd | Electric power steering device |
| CN104024087A (en) * | 2012-10-29 | 2014-09-03 | 日本精工株式会社 | Electric power-steering device |
| CN104149841A (en) * | 2014-08-18 | 2014-11-19 | 安徽江淮汽车股份有限公司 | Abnormal sound prevention structure for worm wheel bearing seat of electric power steering column |
| CN208007050U (en) * | 2018-01-03 | 2018-10-26 | 博世汽车转向系统管理（上海）有限公司 | Electric boosting steering system and its driving unit, bearing spider |
| CN108639144A (en) * | 2018-04-18 | 2018-10-12 | 奇瑞汽车股份有限公司 | A kind of electric steering column output shaft fixing device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109533015A (en) | 2019-03-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4416457B2 (en) | Rolling wheels for crawler type vehicles | |
| US7370724B2 (en) | Motor-driven steering assist apparatus | |
| JP3646556B2 (en) | Elastic shaft coupling | |
| WO2006057310A1 (en) | Bearing device for vehicle | |
| US11325639B2 (en) | Steering gear | |
| CN113700759A (en) | Hub built-in type constant speed device | |
| CN109533015B (en) | Output shaft fixing structure of automobile electric steering speed reducing mechanism | |
| KR102120391B1 (en) | Axle Apparatus for Vehicle | |
| JP4983106B2 (en) | Stabilizer device | |
| JP6267456B2 (en) | Method for manufacturing elastic bush for traveling vehicle | |
| JP2007292275A (en) | Mount bushing | |
| CN209851975U (en) | Rear axle assembly of all-terrain vehicle | |
| JP2006112532A (en) | Bearing for wheel | |
| JP6275971B2 (en) | Elastic bush for railway vehicles | |
| JP5126373B2 (en) | Stabilizer device | |
| CN107972409B (en) | Bearing pressing plate and drive axle | |
| CN210027575U (en) | Electric power steering device with clearance adjusting mechanism | |
| KR20200050263A (en) | Rack Bar Supporting Device of Steering Apparatus for Vehicle | |
| CN212272997U (en) | Variable-stiffness buffering energy absorption ring for EPS speed reducer | |
| JP2015040617A (en) | Process for manufacturing elastic bush for running vehicle | |
| CN209852486U (en) | Rear cradle assembly of all-terrain vehicle | |
| JP2002089622A (en) | Mount insulator | |
| CN112969861B (en) | Swing bearing of steering system | |
| KR102681381B1 (en) | Device for supporting rack for steering of vehicle | |
| CN203384209U (en) | Counteractive rod assembly with rotation type joint and wear-resisting lining |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |