CN111692318A - Worm gear clearance adjustment structure - Google Patents

Worm gear clearance adjustment structure Download PDF

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Publication number
CN111692318A
CN111692318A CN202010621288.XA CN202010621288A CN111692318A CN 111692318 A CN111692318 A CN 111692318A CN 202010621288 A CN202010621288 A CN 202010621288A CN 111692318 A CN111692318 A CN 111692318A
Authority
CN
China
Prior art keywords
worm
clearance
gear
deep groove
groove ball
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.)
Withdrawn
Application number
CN202010621288.XA
Other languages
Chinese (zh)
Inventor
朱晓伟
陈阳斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Knorr-Bremse Detc Commercial Vehicle Braking Technology Co ltd
Original Assignee
Knorr-Bremse Detc Commercial Vehicle Braking Technology Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Knorr-Bremse Detc Commercial Vehicle Braking Technology Co ltd filed Critical Knorr-Bremse Detc Commercial Vehicle Braking Technology Co ltd
Priority to CN202010621288.XA priority Critical patent/CN111692318A/en
Publication of CN111692318A publication Critical patent/CN111692318A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H57/022—Adjustment of gear shafts or bearings
    • 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
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/20—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application
    • B62D5/24—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application for worm type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/029—Gearboxes; Mounting gearing therein characterised by means for sealing the gearboxes, e.g. to improve airtightness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/039—Gearboxes for accommodating worm gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/12—Arrangements for adjusting or for taking-up backlash not provided for elsewhere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H2057/02039—Gearboxes for particular applications
    • F16H2057/02082—Gearboxes for particular applications for application in vehicles other than propelling, e.g. adjustment of parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H2057/0213—Support of worm gear shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H57/022—Adjustment of gear shafts or bearings
    • F16H2057/0221—Axial adjustment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H57/022—Adjustment of gear shafts or bearings
    • F16H2057/0222—Lateral adjustment

Abstract

The invention provides a worm and gear clearance adjusting structure, which is used in a worm and gear reducer for an electric power steering gear, and has the scheme that: a worm wheel mounting cavity and a worm mounting cavity are arranged on a speed reducer shell, a worm wheel and a turbine shaft are mounted in the worm wheel mounting cavity through bearing supports, two ends of the worm are supported in the worm through deep groove ball bearings, the worm is meshed with the worm wheel, the axial clearance of the deep groove ball bearings is adjusted through adjusting nuts, so that the axial clearance between the worm and the worm wheel is adjusted, and the radial clearance between the worm and the worm wheel is adjusted through pressing block nuts and cambered surface pressing blocks. The invention has the innovative idea that the clearance adjustment of the worm gear and the worm is realized by adopting the axial clearance and the radial clearance of the deep groove ball bearing, the influence of tangential force can be overcome, the noise can be reduced in the movement process of the worm gear and the worm, the ECU signal acquisition of the automobile is more accurate, and the reliability of the operation of the worm gear and the worm can be effectively improved.

Description

Worm gear clearance adjustment structure
Technical Field
The invention belongs to the field of automobile electric control hydraulic steering gear assemblies, and relates to a worm gear reducer for an electric power steering gear, in particular to a worm gear clearance adjusting structure in the worm gear reducer.
Background
Due to the development of electronic technology, electronic components are increasingly used in automobile steering systems, and electronic control steering systems such as electric control hydraulic power steering, electric power steering, front wheel active steering, and steer-by-wire are gradually developed.
The electric control hydraulic power steering is to add an electronic control and execution element in a hydraulic power steering system, introduce the vehicle speed into the system and realize that the magnitude of the power assistance changes along with the vehicle speed; the electric-hydraulic steering system mainly transfers the vehicle speed to an electronic element through a vehicle speed sensor, or an ECU controls an electric-hydraulic conversion device to change the power-assisted characteristic of power steering, and the power-assisted characteristic is reduced along with the increase of the vehicle speed, so that the road feel during high-speed driving is increased, and the portability of low-speed steering and the road feel during high-speed steering are better considered.
In the current domestic and foreign electric control hydraulic steering gear assembly, a reducer belt sensor sub-assembly generally adopts a worm gear transmission structure, the main function of the reducer belt sensor sub-assembly is to transmit signals such as torque, corner and rotating speed applied to a steering wheel by a person to an ECU (electronic control unit), and in order to ensure that the ECU can accurately acquire the signals, the clearance between the worm gear and the worm gear needs to be adjusted. In the speed reducer with sensor sub-assembly of the existing electric control hydraulic steering gear, the clearance adjustment of the worm and the gear is realized by arranging an eccentric sleeve on the outer circumference of the shaft end of the worm, and the clearance of the worm and the gear can be easily adjusted by rotating the eccentric sleeve. In addition, one method is to increase an elastic ring on the outer circumference of the shaft end of the worm, and in this way, the clearance between the worm and the worm wheel is a range value, so that the clearance between the worm and the worm wheel cannot be accurately controlled; in addition, the influence of tangential force can cause abnormal sound of worm vibration.
Disclosure of Invention
In order to solve the problems of a worm and gear clearance adjusting mechanism in the prior art, the invention provides a worm and gear clearance adjusting structure which can accurately control the clearance between the worm and gear, is convenient to adjust the clearance and is accurate in data acquisition of an automobile ECU.
Therefore, the technical scheme of the invention is as follows: the utility model provides a worm gear clearance adjustment structure, includes reduction gear housing, is equipped with turbine installation cavity, worm installation cavity on reduction gear housing, and the one end opening of worm installation cavity, turbine are fixed on the turbine shaft, and turbine shaft pass through the bearing support to be installed in the worm gear installation cavity, and the worm both ends are passed through antifriction bearing and are supported in the worm, worm and turbine meshing, its characterized in that:
the rolling bearings at two ends of the worm are deep groove ball bearings, the adjusting nuts are pressed against the end parts of the outer rings of the deep groove ball bearings at the opening ends of the worm mounting cavity, the axial clearances of the deep groove ball bearings are adjusted through the adjusting nuts, so that the axial clearances between the worm and the turbine are adjusted, and locking rings are arranged outside the adjusting nuts;
a radial mounting hole is formed in the inner end of the worm wheel mounting cavity and is communicated with the outer ring of the deep groove ball bearing at the inner end, a cambered press block is arranged in the radial mounting hole in a clearance fit mode, a press block nut is arranged outside the cambered press block and is pressed against the rear end of the cambered press block, and the cambered surface at the front end of the cambered press block is in contact with the outer ring of the deep groove ball bearing at the inner end; the radial clearance of the deep groove ball bearing is adjusted through the pressing block nut and the pressing block with the cambered surface, so that the radial clearance between the worm and the turbine is adjusted.
Furthermore, an O-shaped ring is adopted for sealing between the outer circle of the cambered surface pressing block and the radial mounting hole, so that lubricating grease is prevented from leaking outside through the pressing block nut.
The invention has the beneficial effects that: the invention has the innovative idea that the clearance adjustment of the worm and gear is realized by adopting the axial clearance and the radial clearance existing in the deep groove ball bearing; the axial clearance adjustment of the worm and gear is realized by axially arranging the adjusting nut, and the axial clearance adjustment of the worm and gear is realized by the pressing block nut and the cambered surface pressing block, so that the clearance of the worm and gear is accurately adjusted, the influence of tangential force can be overcome, the conventional technical concept is changed, the noise can be reduced in the movement process of the worm and gear, the signal acquisition of an automobile ECU (electronic control unit) is more accurate, and the running reliability of the worm and gear can be effectively improved; in addition, the adjusting and supporting structure is simple, and the manufacture and the installation are convenient.
Drawings
Fig. 1 is a front view (cross-sectional view) of a worm gear reducer for an electric power steering apparatus according to the present invention.
Fig. 2 is a left side view (cross-sectional view) of the worm gear reducer for an electric power steering apparatus according to the present invention.
FIG. 3 is a view showing a construction of a compact under pressure according to the present invention.
Shown in the figure: 1. the device comprises an upper input shaft, a turbine shaft 2, a turbine 3, a bearing seat 4, a bearing 5, a reducer housing 6, a worm 7, a deep groove ball bearing 8, a locking ring 9, an adjusting nut 10, a cambered press block 11, a press block nut 12 and an end cover 13.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The worm and gear reducer for the electric power steering gear shown in fig. 1 and 2 comprises a worm and gear clearance adjusting structure of the invention, and comprises a reducer housing 6, wherein the reducer housing 6 is provided with a worm and gear mounting cavity and a worm mounting cavity, one end of the worm mounting cavity is opened, a worm gear 3 is fixed on a turbine shaft 2, the worm gear 3 and the turbine shaft 2 are supported and mounted in the worm and gear mounting cavity through a bearing 5, two ends of a worm 7 are supported in the worm through rolling bearings, and the worm is meshed with the worm and gear; the rolling bearings at the two ends of the worm are deep groove ball bearings 8, adjusting nuts 10 are pressed on the end parts of the outer rings of the deep groove ball bearings at the opening ends of the worm mounting cavity, the axial clearances of the deep groove ball bearings are adjusted through the adjusting nuts 10, so that the axial clearances between the worm and the turbine are adjusted, and locking rings 9 are arranged outside the adjusting nuts; a radial mounting hole is formed in the inner end of the worm wheel mounting cavity and is communicated with the outer ring of the deep groove ball bearing 8 at the inner end, a cambered press block 11 is arranged in the radial mounting hole in a clearance fit mode, a press block nut 12 is arranged outside the cambered press block, the press block nut 12 is pressed against the rear end of the cambered press block 11, and the cambered surface at the front end of the cambered press block is in contact with the outer ring of the deep groove ball bearing at the inner end; the radial clearance of the deep groove ball bearing is adjusted through the pressing block nut and the pressing block with the cambered surface, so that the radial clearance between the worm and the turbine is adjusted.
As shown in fig. 1 and 2, a worm gear reducer assembly structure for an electric power steering apparatus according to the present invention will be described: fixing a turbine 3 on a turbine shaft 2, then installing an upper input shaft 1 into the turbine shaft 2, pressing the turbine shaft 2 into a bearing seat 4 provided with a bearing 5 by using a tool, and installing the components in a speed reducer shell 6 provided with the bearing 5 in an assembly manner; the tail end of a worm 7 is arranged in a speed reducer shell 6 pressed with a deep groove ball bearing 8, a worm wheel 3 is meshed with the worm 8, another deep groove ball bearing 9 is pressed in the speed reducer shell 6, the axial clearance between the worm 7 and the worm wheel 3 is adjusted through an adjusting nut 18, and a locking ring 11 is screwed tightly; a cambered press block 11 is arranged, the worm 7 is rotated, the radial clearance between the worm 7 and the turbine 3 is adjusted through a press block nut 12, and finally an upper end cover 13 is arranged; the radial clearance between the worm 7 and the worm wheel 3 can also be adjusted after assembly.
As shown in figure 2, an O-shaped ring is adopted for sealing between the excircle of the cambered surface pressing block and the radial mounting hole, so that lubricating grease is prevented from leaking outside through the pressing block nut.
As shown in fig. 3, the rear end of the press-cambered surface is a flat end surface 11-1, the front end of the press-cambered surface is a cambered surface 11-2, and the outer circumference of the press-cambered surface is provided with a sealing ring installation groove 11-3 for installing the O-ring; one size parameter of the briquetting press 11: the diameter of the front end cambered surface is 30 mm, the concave depth of the front end cambered surface is 1.5 +/-0.1 mm, and the length of the cambered surface pressing block is 10.5 +/-0.1 mm; the diameter of the front end cambered surface is usually set to be not more than the outer diameter of the deep groove ball bearing 8, a point contact type clearance adjusting structure is realized, and the stability of the worm under the action of tangential force is ensured.
The technical core of the invention is as follows: the novel design structure of the arc pressing block is characterized in that a deep groove ball bearing is selected as a rolling bearing for supporting the worm, and clearance adjustment is realized by utilizing the clearance (axial clearance and radial clearance) of the deep groove ball bearing; the idea of changing the gap adjustment structure in the prior art by utilizing the play of the deep groove ball bearing is not easily conceivable by those skilled in the art.

Claims (3)

1. The utility model provides a worm gear clearance adjustment structure, includes reduction gear housing, is equipped with turbine installation cavity, worm installation cavity on reduction gear housing, and the one end opening of worm installation cavity, turbine are fixed on the turbine shaft, and turbine shaft pass through the bearing support to be installed in the worm gear installation cavity, and the worm both ends are passed through antifriction bearing and are supported in the worm, worm and turbine meshing, its characterized in that:
the rolling bearings at two ends of the worm are deep groove ball bearings, the adjusting nuts are pressed against the end parts of the outer rings of the deep groove ball bearings at the opening ends of the worm mounting cavity, the axial clearances of the deep groove ball bearings are adjusted through the adjusting nuts, so that the axial clearances between the worm and the turbine are adjusted, and locking rings are arranged outside the adjusting nuts;
a radial mounting hole is formed in the inner end of the worm wheel mounting cavity and is communicated with the outer ring of the deep groove ball bearing at the inner end, a cambered press block is arranged in the radial mounting hole in a clearance fit mode, a press block nut is arranged outside the cambered press block and is pressed against the rear end of the cambered press block, and the cambered surface at the front end of the cambered press block is in contact with the outer ring of the deep groove ball bearing at the inner end; the radial clearance of the deep groove ball bearing is adjusted through the pressing block nut and the pressing block with the cambered surface, so that the radial clearance between the worm and the turbine is adjusted.
2. The clearance adjustment structure for a worm gear according to claim 1, wherein: and an O-shaped ring is adopted for sealing between the excircle of the cambered surface pressing block and the radial mounting hole.
3. A worm gear clearance adjustment structure according to claim 2, wherein a dimension parameter of the briquetting: the diameter of the front end cambered surface is 30 mm, the concave depth of the front end cambered surface is 1.5 +/-0.1 mm, and the length of the cambered press block is 10.5 +/-0.1 mm.
CN202010621288.XA 2020-07-01 2020-07-01 Worm gear clearance adjustment structure Withdrawn CN111692318A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010621288.XA CN111692318A (en) 2020-07-01 2020-07-01 Worm gear clearance adjustment structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010621288.XA CN111692318A (en) 2020-07-01 2020-07-01 Worm gear clearance adjustment structure

Publications (1)

Publication Number Publication Date
CN111692318A true CN111692318A (en) 2020-09-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010621288.XA Withdrawn CN111692318A (en) 2020-07-01 2020-07-01 Worm gear clearance adjustment structure

Country Status (1)

Country Link
CN (1) CN111692318A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1227217A (en) * 1967-07-14 1971-04-07
US3814962A (en) * 1971-12-02 1974-06-04 M Baermann Magnetic worm drive
CN102269238A (en) * 2011-07-20 2011-12-07 浙江恒丰泰减速机制造有限公司 Integral type multifunctional locating transmission mechanism
CN206813091U (en) * 2017-04-26 2017-12-29 马兴礼 Sideshake mechanism is determined in electric power-assisted steering apparatus self compensation
CN209781646U (en) * 2019-01-09 2019-12-13 银川威力传动技术股份有限公司 Worm gear backlash adjusting device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1227217A (en) * 1967-07-14 1971-04-07
US3814962A (en) * 1971-12-02 1974-06-04 M Baermann Magnetic worm drive
CN102269238A (en) * 2011-07-20 2011-12-07 浙江恒丰泰减速机制造有限公司 Integral type multifunctional locating transmission mechanism
CN206813091U (en) * 2017-04-26 2017-12-29 马兴礼 Sideshake mechanism is determined in electric power-assisted steering apparatus self compensation
CN209781646U (en) * 2019-01-09 2019-12-13 银川威力传动技术股份有限公司 Worm gear backlash adjusting device

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Application publication date: 20200922