CN114110108A - Synchronous belt tensioning device of electric power steering gear - Google Patents
Synchronous belt tensioning device of electric power steering gear Download PDFInfo
- Publication number
- CN114110108A CN114110108A CN202210097113.2A CN202210097113A CN114110108A CN 114110108 A CN114110108 A CN 114110108A CN 202210097113 A CN202210097113 A CN 202210097113A CN 114110108 A CN114110108 A CN 114110108A
- Authority
- CN
- China
- Prior art keywords
- synchronous belt
- wheel
- tension
- tensioning
- electric power
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- 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.)
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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
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
-
- 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
-
- 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
- B62D5/0445—Screw drives
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- 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
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/18—Means for guiding or supporting belts, ropes, or chains
- F16H7/20—Mountings for rollers or pulleys
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
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- 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
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0842—Mounting or support of tensioner
-
- 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
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0863—Finally actuated members, e.g. constructional details thereof
- F16H2007/0865—Pulleys
-
- 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
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0876—Control or adjustment of actuators
- F16H2007/088—Manual 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
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0889—Path of movement of the finally actuated member
- F16H2007/0893—Circular path
-
- 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
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H2025/2062—Arrangements for driving the actuator
- F16H2025/2096—Arrangements for driving the actuator using endless flexible members
Abstract
The invention discloses a synchronous belt tensioning device of an electric power steering gear, which comprises a motor shell, wherein a ball screw pair is arranged in the motor shell, a large belt wheel is arranged on the outer surface of the ball screw pair, a synchronous belt is connected to the outer surface of the large belt wheel in a transmission manner, a small belt wheel is connected to the inner surface of the synchronous belt in a transmission manner, a tensioning wheel outer ring is attached to the outer side of the synchronous belt, a bearing, a tensioning wheel inner ring, a hole elastic check ring and a shaft elastic check ring are arranged in the tensioning wheel outer ring, a tensioning force testing tool is fixedly arranged on one side of the top of the motor shell, and a dial indicator is arranged on the tensioning wheel testing tool. The invention provides a synchronous belt tensioning device of an electric power steering gear, which is characterized in that the type selection and the tensioning force design calculation of a synchronous belt are carried out at the design stage according to the product space arrangement and the setting of a preliminary scheme, the DVP period of product development is shortened, and the product quality is improved.
Description
Technical Field
The invention belongs to the technical field of automobile steering, and particularly relates to a synchronous belt tensioning device of an electric power steering gear.
Background
The working principle of the rack type electric power steering gear is as follows: the torque transmitted by the steering wheel is provided for an input shaft of the electric power steering gear through a whole vehicle pipe column and a lower shaft universal joint assembly, the input torque and the input angle are judged through a torque angle integrated sensor installed on the input shaft, signals are transmitted to a controller, the controller sends out signals to control the motor to run, the motor transmits power to a ball screw pair and a gear and rack pair through a belt transmission pair, and then the power is provided for the steering wheel to realize the power steering function.
Because of the requirements of the internal structure and space limitation of the rack type electric power steering gear and the low noise of the product, the helical tooth synchronous belt is usually adopted as a transmission medium, the synchronous belt with the inclination angle of 5 degrees and the pitch of 2mm is usually selected in the industry of the electric power steering gear, the large belt wheel and the small belt wheel are both manufactured into helical tooth structures matched with the large belt wheel and the small belt wheel, and a tension wheel or other tension mechanisms are applied to tension the synchronous belt.
According to the technical background, the reasonability of the tension setting of the synchronous belt has important significance on whether the belt transmission pair can work smoothly. If the tension force parameter is set to be too small, the synchronous belt is installed and then slips or jumps along with the increase of the product load, and the phenomenon of slipping or jumping along with great noise occurs; if the tension parameter is set too large, the synchronous belt will have early wear, accelerated wear, and even break, which affects the product life.
Disclosure of Invention
The invention aims to provide a synchronous belt tensioning device of an electric power steering gear, which aims to solve the problems and is used for carrying out model selection and tension design calculation on a synchronous belt according to product space arrangement and preliminary scheme setting in a design stage, shortening the DVP period of product development and improving the product quality.
In order to achieve the purpose, the invention provides the following technical scheme: a synchronous belt tensioning device of an electric power steering gear comprises a motor shell, a ball screw pair is arranged inside the motor shell, the outer surface of the ball screw pair is provided with a large belt wheel, the outer surface of the large belt wheel is connected with a synchronous belt in a transmission way, the inner surface of the synchronous belt is connected with a small belt wheel in a transmission way, the outer side of the synchronous belt is provided with a tension wheel outer ring in a fitting way, a bearing, a tensioning wheel inner ring, a hole elastic retainer ring and a shaft elastic retainer ring are arranged in the tensioning wheel outer ring, a tension force testing tool is fixedly arranged on one side of the top of the motor shell, the tension wheel testing tool is provided with a dial indicator, the side surface of the dial indicator is provided with a tension and compression sensor, the side surface of the tension and compression sensor is connected with a display, the tensile force testing tool is provided with an adjusting handle, the other end of the adjusting handle is provided with a connecting rod mechanism, and a shifting piece is arranged at the connecting end of the connecting rod mechanism.
As a preferable technical solution of the present invention, an inner ring of the tension pulley is provided at an inner center of the outer ring of the tension pulley, a bearing is provided on an outer surface of the inner ring of the tension pulley, a circlip for a shaft is provided on a top of the bearing, and a circlip for a hole is provided on a bottom of the bearing.
As a preferred technical scheme of the invention, a bolt positioning hole is arranged inside the inner ring of the tension wheel, and the bolt positioning hole is in an eccentric structure.
As a preferable technical solution of the present invention, the large pulley and the nut in the ball screw pair are integrally provided.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a synchronous belt tensioning device of an electric power steering gear, which is characterized in that the type selection and the tensioning force design calculation of a synchronous belt are carried out at the design stage according to the product space arrangement and the setting of a preliminary scheme, the DVP period of product development is shortened, and the product quality is improved.
Drawings
FIG. 1 is a schematic perspective view of a tensioner of the present invention;
FIG. 2 is a cross-sectional view of the tensioner of the present invention;
FIG. 3 is a schematic view of the pre-tension timing belt installation of the present invention;
FIG. 4 is a schematic view of the installation of the tensioned timing belt of the present invention;
FIG. 5 is a plot of tensioner angle versus torque of the present invention;
FIG. 6 is a planar test chart of the tension of the present invention;
FIG. 7 is a three-dimensional test chart of the tension of the present invention.
In the figure: 1. an outer ring of the tensioning wheel; 2. a bearing; 3. an inner ring of the tension wheel; 4. a circlip for a hole; 5. a circlip for the shaft; 6. a large belt pulley; 7. a small belt pulley; 8. a synchronous belt; 9. a motor housing; 10. a tension force testing tool; 11. a dial indicator; 12. an adjusting handle; 13. a tension and compression sensor; 14. a display; 15. a link mechanism; 16. a ball screw pair; 17. a shifting sheet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides a technical solution of a synchronous belt tensioning device for an electric power steering gear: including motor casing 9, the inside of motor casing 9 is equipped with ball screw pair 16, the surface of ball screw pair 16 is equipped with big band pulley 6, the surface transmission of big band pulley 6 is connected with hold-in range 8, the internal surface transmission of hold-in range 8 is connected with little band pulley 7, the outside laminating of hold-in range 8 is equipped with take-up pulley outer lane 1, 1 inside bearing 2 that is equipped with in take-up pulley outer lane, take-up pulley inner circle 3, circlip 4 for the hole, axle circlip 5, the fixed tensile force test fixture 10 that is equipped with in top one side of motor casing 9, take-up pulley test fixture 10 is equipped with percentage table 11, the side of percentage table 11 is equipped with draws and presses sensor 13, the side that draws and press sensor 13 is connected with display 14, tensile force test fixture 10 is equipped with adjustment handle 12, adjustment handle 12's the other end is equipped with link mechanism 15, link mechanism 15's link is equipped with plectrum 17.
In other embodiments, the inner center of the tensioning wheel outer ring 1 is provided with a tensioning wheel inner ring 3, the outer surface of the tensioning wheel inner ring 3 is provided with a bearing 2, the top of the bearing 2 is provided with a shaft elastic retaining ring 5, and the bottom of the bearing 2 is provided with a hole elastic retaining ring 4.
In other embodiments, the inner part of the tension pulley inner ring 3 is provided with a bolt positioning hole, and the bolt positioning hole is in an eccentric structure; the purpose of this design is to achieve the effect of adjusting the tension of the timing belt 8 by the eccentric rotation of the tension pulley inner ring 3.
In other embodiments, the large pulley 6 is provided as a unitary structure with the nut in the ball screw pair 16.
For the model selection calculation of the synchronous belt, taking fig. 3 and 4 as an example, we assume that the center distance between the large belt pulley 6 and the small belt pulley 7 is 91mm, the number of teeth of the large belt pulley 6 is 124 teeth, the number of teeth of the small belt pulley 7 is 30 teeth, the pitch between the teeth of the large belt pulley 6 and the small belt pulley 7 is 2mm, and the right hand is inclined by 5 °. As shown in fig. 3 and 4
Is the center of the big belt wheel 6;
is the center of the small belt pulley 7;
is the theoretical center of the tensioning wheel outer ring 3;
is the center of a bolt hole of the tension wheel; in the figure, the center distance between the large belt wheel 6 and the small belt wheel 7
=91mm；
=67.6mm；
=33 mm. Due to the figureFig. 3 is a schematic view of installation of the timing belt 8 before tensioning, and fig. 4 is a schematic view of installation of the timing belt 8 after tensioning. According to the formula of the arc length calculation shown in fig. 3, the circumference of the synchronous belt 8 satisfying the minimum installation is
Wherein L is the length of 8 circumferences of the synchronous belt,
the smallest circumference of the timing belt 8 not enveloped by a pulley,
the smallest circumference of the timing belt 8 which is enveloped by the small pulley 7,
the minimum circumference of the synchronous belt 8 enveloping the large pulley 6 is calculated, and according to the calculation result and considering the installation of the synchronous belt 8 and the installation of the tension pulley 1, the synchronous belt 8 with the circumference of 356mm is selected, the pitch is 2mm, and the inclination is 5 degrees.
In order to find the maximum value of the tensioning force, through repeated calculation and actual test, the eccentricity e =1.7mm and the outer ring 3 phi =34mm of the tensioning wheel are found through comparison of multiple groups of data, and the tensioning effect is best. The magnitude of the tightening torque is a curve that varies with angle, as shown in fig. 5.
According to the formula of fig. 4, under the condition that the installed tension is at the maximum value, the arc length of the synchronous belt 8 is as follows
Wherein the content of the first and second substances,
in order to tension the 8-circumference-length synchronous belt,
see fig. 4.
From the above calculation, when the synchronous belt 8 is tensioned in the above manner, the tensioned circumference is extended by 3.35mm in total compared with the original synchronous belt 8 having a circumference of 356 mm. Since it is difficult to control the maximum value of the tightening torque during the actual installation, an angular range of 2 α is selected, and within this range, it is determined that the installation is acceptable. According to multiple actual installation tests, 2 alpha = +/-10 degrees is tested, and the angle range is ensured by using a tool in the installation process of the tension pulley 1.
Through the above calculation and analysis, as shown in fig. 6 and 7, a tension testing tool 10 is designed for testing the magnitude of the tension. Firstly fix test fixture on motor casing 1, rotatory adjustment handle 12 drives link mechanism 15 and moves along axial product direction, and link mechanism 15 drive plectrum 17, and plectrum 17 drives hold-in range 8, and hold-in range 8 is more and more tight, measures the tensile force with this mode. In the figure, the pointer of the dial indicator 11 rotates one circle every time the adjusting handle 12 rotates one circle, and the shifting piece 17 moves 1 mm. The tension sensor 13 can display the tension value through the display 14. The test data are shown in table 1.
TABLE 1
Through the test of the four samples, the analysis results show that the initial tension is 250N +/-20N, and the numerical consistency of the tension is better.
And (3) carrying out a forward driving abrasion test on the sample to verify whether the tension can bear the forward driving abrasion test or not, and further verifying the feasibility of the design scheme of the tension, wherein the test result is shown in a table 2.
TABLE 2
The synchronous belt 8 in the fourth test has good performance, no noise, no slipping and tooth jumping phenomenon of the synchronous belt 8 exist in the test, the tooth surface is complete after disassembly and almost worn, the test requirement on forward driving wear in the automobile industry standard is met, and the design scheme is proved to be reasonable.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. An electric power steering gear hold-in range overspeed device tensioner, includes motor casing (9), its characterized in that: the tension testing device is characterized in that a ball screw pair (16) is arranged inside the motor shell (9), a large belt wheel (6) is arranged on the outer surface of the ball screw pair (16), a synchronous belt (8) is connected to the outer surface of the large belt wheel (6) in a transmission manner, a small belt wheel (7) is connected to the inner surface of the synchronous belt (8) in a transmission manner, a tension wheel outer ring (1) is arranged on the outer side of the synchronous belt (8) in a laminating manner, a bearing (2), a tension wheel inner ring (3), a hole elastic check ring (4) and a shaft elastic check ring (5) are arranged inside the tension wheel outer ring (1), a tension testing tool (10) is fixedly arranged on one side of the top of the motor shell (9), the tension testing tool (10) is provided with a dial indicator (11), a tension and compression sensor (13) is arranged on the side surface of the dial indicator (11), and a display (14) is connected to the side surface of the tension and compression sensor (13), tensile force test fixture (10) is equipped with adjustment handle (12), the other end of adjustment handle (12) is equipped with link mechanism (15), the link of link mechanism (15) is equipped with plectrum (17).
2. The electric power steering gear synchronous belt tensioning device according to claim 1, characterized in that: the tensioning wheel is characterized in that a tensioning wheel inner ring (3) is arranged at the center of the interior of the tensioning wheel outer ring (1), a bearing (2) is arranged on the outer surface of the tensioning wheel inner ring (3), an axial elastic check ring (5) is arranged at the top of the bearing (2), and an elastic check ring (4) for holes is arranged at the bottom of the bearing (2).
3. The electric power steering gear synchronous belt tensioning device according to claim 1, characterized in that: and a bolt positioning hole is formed in the inner ring (3) of the tensioning wheel and is of an eccentric structure.
4. The electric power steering gear synchronous belt tensioning device according to claim 1, characterized in that: the large belt wheel (6) and a nut in the ball screw pair (16) are arranged in an integrated structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210097113.2A CN114110108A (en) | 2022-01-27 | 2022-01-27 | Synchronous belt tensioning device of electric power steering gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210097113.2A CN114110108A (en) | 2022-01-27 | 2022-01-27 | Synchronous belt tensioning device of electric power steering gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114110108A true CN114110108A (en) | 2022-03-01 |
Family
ID=80361274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210097113.2A Pending CN114110108A (en) | 2022-01-27 | 2022-01-27 | Synchronous belt tensioning device of electric power steering gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114110108A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1189610A (en) * | 1997-01-30 | 1998-08-05 | 三星电子株式会社 | Apparatus and method for testing belt tension of belt drive |
| JP2003237596A (en) * | 2002-02-21 | 2003-08-27 | Koyo Seiko Co Ltd | Electric power steering device |
| US20050197224A1 (en) * | 2002-01-29 | 2005-09-08 | Koyo Seiko Co., Ltd. | Electric power steering apparatus |
| CN203858105U (en) * | 2014-03-27 | 2014-10-01 | 奇瑞汽车股份有限公司 | Tensioner testing tool |
| CN107010097A (en) * | 2015-12-17 | 2017-08-04 | 株式会社捷太格特 | Transfer |
| CN107054445A (en) * | 2015-10-06 | 2017-08-18 | 株式会社捷太格特 | Transfer |
| CN208457129U (en) * | 2017-12-28 | 2019-02-01 | 耐世特汽车系统（苏州）有限公司 | Monoblock type for rack type electronics power-assisted car turning machine is tensioned idle pulley |
| DE102018218161A1 (en) * | 2018-10-24 | 2020-04-30 | Contitech Antriebssysteme Gmbh | Method and device for measuring the pretensioning force of a drive belt |
| CN214248187U (en) * | 2020-12-19 | 2021-09-21 | 天津德科智控股份有限公司 | Rack type electric power steering gear belt pulley fixing device |
-
2022
- 2022-01-27 CN CN202210097113.2A patent/CN114110108A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1189610A (en) * | 1997-01-30 | 1998-08-05 | 三星电子株式会社 | Apparatus and method for testing belt tension of belt drive |
| US20050197224A1 (en) * | 2002-01-29 | 2005-09-08 | Koyo Seiko Co., Ltd. | Electric power steering apparatus |
| JP2003237596A (en) * | 2002-02-21 | 2003-08-27 | Koyo Seiko Co Ltd | Electric power steering device |
| CN203858105U (en) * | 2014-03-27 | 2014-10-01 | 奇瑞汽车股份有限公司 | Tensioner testing tool |
| CN107054445A (en) * | 2015-10-06 | 2017-08-18 | 株式会社捷太格特 | Transfer |
| CN107010097A (en) * | 2015-12-17 | 2017-08-04 | 株式会社捷太格特 | Transfer |
| CN208457129U (en) * | 2017-12-28 | 2019-02-01 | 耐世特汽车系统（苏州）有限公司 | Monoblock type for rack type electronics power-assisted car turning machine is tensioned idle pulley |
| DE102018218161A1 (en) * | 2018-10-24 | 2020-04-30 | Contitech Antriebssysteme Gmbh | Method and device for measuring the pretensioning force of a drive belt |
| CN214248187U (en) * | 2020-12-19 | 2021-09-21 | 天津德科智控股份有限公司 | Rack type electric power steering gear belt pulley fixing device |
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Application publication date: 20220301 |
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