CN113212544B - Rack pressing device of rack and pinion steering gear and meshing clearance measuring method - Google Patents
Rack pressing device of rack and pinion steering gear and meshing clearance measuring method Download PDFInfo
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- CN113212544B CN113212544B CN202110460003.3A CN202110460003A CN113212544B CN 113212544 B CN113212544 B CN 113212544B CN 202110460003 A CN202110460003 A CN 202110460003A CN 113212544 B CN113212544 B CN 113212544B
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- rack
- pressing block
- displacement
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- gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D3/00—Steering gears
- B62D3/02—Steering gears mechanical
- B62D3/12—Steering gears mechanical of rack-and-pinion type
- B62D3/126—Steering gears mechanical of rack-and-pinion type characterised by the rack
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Transmission Devices (AREA)
Abstract
The invention discloses a rack pressing device of a rack and pinion steering gear and a meshing clearance measuring method, wherein the rack pressing device for the rack and pinion steering gear comprises a pressing block cover and a pressing block bottom; the pressing block bottom is in arc contact with the back of the rack, and a groove for mounting a rubber ring is formed in the contact side of the pressing block bottom and the rack, so that the friction between metal parts is reduced, and the abrasion of the rack pressing block is reduced; the pressing block cover cylinder is connected with a pressing block bottom center hole, and the pressing block cover is in threaded connection with the steering gear shell. The invention also discloses a device and a method for measuring the meshing clearance of the gear rack of the steering gear, the steering gear is fixed on the rack, the measuring device is positioned at the top end of the rack, the displacement measuring device is two laser displacement sensors which are symmetrical to two sides of the central axis of the rack, and a measuring head passes through a through hole at the central position of the bottom of a pressing block and is not contacted with one side of the back of the rack during measurement. The structure is simple, unnecessary abrasion during measurement is avoided, and the precision of measuring the meshing clearance is improved.
Description
Technical Field
The invention belongs to the technical field of automobile steering systems, and particularly relates to a rack pressing device for a rack and pinion steering gear, an engagement clearance measuring device and an engagement clearance measuring method thereof.
Background
With the rapid development of society and the improvement of the national economy level, the quality of life obviously becomes a more important factor for people. Compared with the rare number of automobiles in the past era, the automobiles become very popular in the current society and become necessary transportation means in daily life of people. The automobile steering system is an important component of an automobile and is a system closely related to the driving stability of the automobile. The steering system mainly comprises three subsystems: a steering control mechanism, a steering gear and a steering transmission mechanism. The steering gear is used for properly converting steering torque and steering angle from a steering wheel (mainly reducing speed and increasing distance) and outputting the steering torque and the steering angle to a steering pull rod mechanism, so that the automobile is steered. Steering gears are of various types, such as rack and pinion type, recirculating ball type, worm and crank finger pin type, power steering gears, and the like. Rack and pinion steering gears are currently the most commonly used form of steering gear for automobiles.
In the conventional art, a pressing device of a rack and pinion steering gear for pressing a rack is often of an integral pressing block structure. The rack is directly pressed by the arc-shaped pressing block with 45-degree line contact, and the rack is abutted against the input shaft under the action of the pressing mechanism, so that the meshing of the gear and the rack is realized. The device easily causes the wearing and tearing of rack and pinion, and steering gear meshing clearance is difficult to measure. In the prior art, when the meshing clearance of the gear and the rack is measured, a measuring mechanism usually uses a dial indicator or a dial indicator, and a measuring head is or is propped against a pressing block to indirectly measure the meshing clearance of the gear and the rack in the existing meshing clearance measuring process; in other measuring methods, a hole is formed in the pressing block, the measuring head is contacted with the back end of the propping rack, and the meshing clearance of the gear and the rack is measured. When the gear rack rotates, the measuring head can slide left and right, and the measuring precision of the gap is influenced.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a rack pressing device for a rack and pinion steering gear, an engagement clearance measuring device and a method for measuring the engagement clearance, which can reduce the friction between a rack and a pressing block and are convenient for measuring the engagement clearance of the rack and pinion.
The technical scheme adopted by the invention is as follows:
the rack pressing device for the rack and pinion steering gear comprises a pressing block cover and a pressing block bottom; the pressing block cover comprises a cover body part, a cylinder part is coaxially arranged at the center of the cover body part, and the diameter of the cover body part is larger than that of the cylinder part; the bottom of the column part is an inward concave cambered groove; and the side wall surface of the cover body part is provided with threads;
the outer part of the pressing block bottom is cylindrical, a through hole is axially formed in the center of the pressing block bottom, and the diameter of the through hole is matched with that of the cylinder part; the detachable connection between the pressing block bottom and the pressing block cover is realized by using a fastener; the bottom of the pressing block bottom is an inward concave cambered surface groove; the cambered surface groove at the bottom of the pressing block and the cambered surface groove at the bottom of the column part are on the same circular arc, and the circular arc is attached to the external arc of the rack, so that the pressing effect on the rack is achieved.
Further, the cambered surface groove at the bottom of the pressing block is symmetrically provided with grooves, the lining strips made of rubber are arranged in the grooves, the rubber lining strips can reduce friction between the bottom of the pressing block and the rack in direct contact, the rack abrasion is reduced, and the relative position between the bottom of the pressing block and the rack is limited.
Furthermore, a plurality of connecting holes are formed in the cover body part, a plurality of screw holes are formed in the upper surface of the pressing block bottom, and the screw holes correspond to the connecting holes in the cover body part one by one;
furthermore, a plurality of second annular grooves are formed in the side wall surface of the column body part, and second rubber rings are arranged in the second annular grooves; the second rubber ring can enable the pressing block cover to be tightly combined with the pressing block bottom, and the position stability of the pressing device during normal pressing operation is guaranteed.
Furthermore, a plurality of first annular grooves are formed in the side wall surface of the bottom of the pressing block, a first rubber ring is arranged in each first annular groove, and the first rubber ring can stabilize the position of the pressing device in the steering gear shell to prevent the bottom of the pressing block from being severely abraded with the steering gear shell.
Furthermore, a rubber gasket is arranged between the pressing block bottom and the pressing block cover.
A gear rack gap measuring device of a gear rack steering gear comprises a rack, wherein a group of fixing frames are fixedly arranged on the upper surface of the rack, each group of fixing frames comprises two symmetrically distributed supporting frames, and the top of each supporting frame is provided with a displacement measuring device; the displacement measuring device adopts a laser displacement sensor or a grating displacement sensor; a supporting unit is arranged between the two supporting frames and consists of two U-shaped brackets which are symmetrically distributed; the bottom of the U-shaped support is fixedly arranged on the rack.
Furthermore, when the gear and rack clearance of the gear and rack steering gear is measured, only the pressing block cover needs to be opened, the measuring head of each displacement measuring device extends into the through hole, and the displacement measuring device is used for detecting the displacement generated between the gear and the rack in the rotating and meshing process, namely the meshing clearance between the gear and the rack.
A gear rack clearance measurement method for a gear rack steering gear comprises the following steps:
The invention has the beneficial effects that:
1. the rack pressing device comprises a pressing block cover and a pressing block bottom, wherein the pressing block cover is opened during measurement, and the displacement measurement device is used for directly measuring the displacement generated between the rack and the gear, so that the measurement is more direct and accurate than the indirect measurement of the meshing clearance;
2. the arc-shaped groove on the lower surface of the pressing block is matched with the rack in size and is provided with the rubber lining strip, so that friction is reduced, and abrasion between the pressing block and the rack is reduced;
3. the gap measuring device adopts a laser displacement sensor or a grating displacement sensor, does not need to contact the back of the rack, improves the accuracy of the measurement value, and simultaneously avoids unnecessary abrasion caused by the traditional contact of the rack during measurement.
Drawings
The invention will be further explained with reference to the drawings and the detailed description;
FIG. 1 is a cross-sectional view of a rack and pinion steering gear with a rack hold-down device according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a rack pressing device;
FIG. 3 is a schematic view of the construction of the pressure block cover of FIG. 2;
FIG. 4 is a schematic structural view of the compact base of FIG. 2;
FIG. 5 is a schematic view of the step structure of the press sole of FIG. 4;
FIG. 6 is a schematic view showing the structure of the rubber lining in FIG. 2
FIG. 7 is a schematic view of a fastening screw of the compression device of FIG. 1;
FIG. 8 is a schematic view of a gap measuring device;
the labels in the above figures are: 1. the device comprises a pressing block cover, 2, a pressing block bottom, 3, a first annular groove, 4, a fastening screw, 5, a rubber gasket, 6, a rack, 7, a gear, 8, a steering gear shell, 9, a through hole, 10, a second annular groove, 11, a first rubber ring, 12, a second rubber ring, 13, a rack, 14, a U-shaped support, 15, a displacement measuring device, 16, a support frame, 17, a screw hole, 18, a groove, 19, a column part, 20 and a support frame through hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in the cross-sectional structure diagram of the rack and pinion steering gear shown in fig. 1, the rack pressing device for the rack and pinion steering gear designed by the present application comprises a pressing block cover 1 and a pressing block bottom 2; the compact cover 1 shown in fig. 2 and 3 includes a lid portion and a cylindrical portion 19, both the lid portion and the cylindrical portion 19 being cylindrical, but the lid portion having a larger diameter than the cylindrical portion 19, and the cylindrical portion 19 being coaxially provided at the bottom of the lid portion, as a whole, like an umbrella. The cover body portion is provided with a plurality of connecting holes, the side wall surface of the cover body portion is provided with threads 001, and the pressure block cover 1 is connected with the steering gear housing 8 through the threads. A plurality of second annular grooves 10 are formed in the side wall surface of the column body part 19, second rubber rings 12 are arranged in the second annular grooves 10, the second rubber rings 12 enable the pressing block cover 1 and the pressing block bottom 2 to be tightly combined, and the position stability of the pressing device during normal pressing work is guaranteed. The bottom of the column part 19 is an arc groove which is concave inwards.
As shown in fig. 4, 5 and 7, the outer portion of the press block bottom 2 is cylindrical, a plurality of first annular grooves 3 are formed in the side wall surface of the press block bottom 2, first rubber rings 11 are arranged in the first annular grooves 3, and the first rubber rings 11 can stabilize the position of the pressing device in the steering gear shell, so that the press block bottom 2 and the shell 8 are prevented from being severely worn. A through hole 9 is axially formed in the center of the press block bottom 2, the diameter of the through hole 9 is matched with that of the column part 19, and the column part 19 can be ensured to penetrate into the through hole 9 during installation. A plurality of screw holes 17 are formed in the upper surface of the press block bottom 2, and the screw holes 17 correspond to the connecting holes of the cover body part one by one; the fastening screws 4 sequentially penetrate through the connecting holes and the screw holes 17 to realize the connection between the pressing block bottom 2 and the pressing block cover 1. The bottom of the pressing block bottom 2 is an inward concave arc groove, the arc groove at the bottom of the pressing block bottom 2 and the arc groove at the bottom of the column part 19 are on the same arc, and the arc is attached to the outer arc of the rack 6, so that the pressing effect on the rack 6 is achieved. The grooves 18 shown in the figure 5 are symmetrically arranged on the cambered surface groove at the bottom of the pressing block bottom 2, the lining strips made of rubber are arranged in the grooves 18, the rubber lining strips can reduce friction when the pressing block bottom 2 is in direct contact with the rack 6, rack abrasion is reduced, and the relative position of the pressing block device and the rack 6 is limited.
As shown in fig. 6, a rubber gasket 5 is further installed between the press block bottom 2 and the press block cover 1, a hole matched with the through hole 9 in size and position is formed in the center of the rubber gasket 5, screw holes matched with the four screw holes 17 in size and position of the press block bottom 2 are further formed in the rubber gasket 5, the press block cover 1 and the press block bottom 2 can be fastened by the rubber gasket 5, and abrasion when the press block cover 1 is in direct contact with the press block bottom 2 is prevented.
Based on the rack pressing device, the application also provides a rack gap measuring device of a rack and pinion steering gear, as shown in fig. 8, which comprises a rack 13, wherein a group of fixed frames are fixedly arranged on the upper surface of the rack 13, each group of fixed frames comprises two symmetrically distributed support frames 16, and the top of each support frame 16 is provided with a displacement measuring device 15; the displacement measuring device 15 adopts a laser displacement sensor or a grating displacement sensor; the side wall surface of each support frame 16 is provided with a support frame through hole 20. When the gear rack clearance of the gear rack steering gear is measured, only the press block cover 1 needs to be opened, the measuring head of each displacement measuring device 15 extends into the through hole 9, and the displacement measuring device 15 is used for detecting the displacement generated between the gear 7 and the rack 6 in the rotating and meshing process, namely the meshing clearance between the gear 7 and the rack 6. The gear rack gap measuring device designed by the application does not need to be in contact with the rack 6; and the extension lines of the two measuring heads are arranged on the two sides of the axis of the rack 6, so that the error caused by the measurement of the gap by a single measuring head when the gear rack rotates left and right in the traditional technology is eliminated.
Based on the rack and pinion clearance measuring device of the rack and pinion steering gear, the application also provides a rack and pinion clearance measuring method for the rack and pinion steering gear, which comprises the following steps:
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.
Claims (9)
1. A rack pressing device for a rack and pinion steering gear is characterized by comprising a pressing block cover (1) and a pressing block bottom (2); the briquetting cover (1) comprises a cover body part, wherein a cylinder part (19) is coaxially arranged at the center of the cover body part, and the diameter of the cover body part is larger than that of the cylinder part (19); the bottom of the cylinder part (19) is an inward concave arc groove; and a screw thread (001) is arranged on the side wall surface of the cover body part;
the outer part of the pressing block bottom (2) is cylindrical, a through hole (9) is formed in the center of the pressing block bottom (2) along the axial direction, and the diameter of the through hole (9) is matched with that of the cylinder part (19); the detachable connection between the pressing block bottom (2) and the pressing block cover (1) is realized by using a fastener; the bottom of the pressing block bottom (2) is an inward concave arc groove; the cambered surface groove at the bottom of the pressing block (2) and the cambered surface groove at the bottom of the column body part (19) are on the same circular arc, and the circular arc is attached to the external arc of the rack (6) so as to play a role in compressing the rack (6).
2. The rack pressing device according to claim 1, characterized in that the grooves (18) are symmetrically arranged on the cambered groove at the bottom of the press block bottom (2), and the rubber lining strips are arranged in the grooves (18) and can reduce friction when the press block bottom (2) is in direct contact with the rack (6), reduce rack abrasion and limit the relative position of the press block bottom (2) and the rack (6).
3. The rack pressing device according to claim 1, wherein a plurality of attachment holes are formed in the cover portion, a plurality of screw holes (17) are formed in the upper surface of the press block bottom (2), and the screw holes (17) correspond to the attachment holes of the cover portion one to one.
4. The rack pressing device according to claim 1, wherein a plurality of second annular grooves (10) are formed in the side wall surface of the cylindrical portion (19), and a second rubber ring (12) is fitted in the second annular grooves (10); the second rubber ring (12) can enable the pressing block cover (1) and the pressing block bottom (2) to be tightly combined, and the position stability of the pressing device during normal pressing operation is guaranteed.
5. The rack pressing device according to claim 1, wherein a plurality of first annular grooves (3) are formed in the side wall surface of the pressing block bottom (2), a first rubber ring (11) is arranged in each first annular groove (3), and the first rubber ring (11) can stabilize the position of the pressing device in the steering gear shell (8) and prevent the pressing block bottom (2) and the steering gear shell (8) from being severely abraded.
6. The rack hold-down device according to claim 1, characterized in that a rubber gasket (5) is further provided between the press block bottom (2) and the press block cover (1).
7. A rack and pinion clearance measuring device of a rack and pinion steering gear suitable for a rack pressing device according to claim 1, characterized by comprising a rack (13), wherein a group of fixing frames are fixedly arranged on the upper surface of the rack (13), each group of fixing frames comprises two symmetrically distributed supporting frames (16), and the top of each supporting frame (16) is provided with a displacement measuring device (15); the displacement measuring device (15) adopts a laser displacement sensor or a grating displacement sensor; a supporting unit is arranged between the two supporting frames (16), and the supporting unit is composed of two U-shaped brackets (14) which are symmetrically distributed; the bottom of the U-shaped bracket (14) is fixedly arranged on the rack (13).
8. The rack and pinion clearance measuring device according to claim 7, wherein when measuring the rack and pinion clearance of the rack and pinion steering gear, it is only necessary to open the press block cover (1) and extend the measuring head of each displacement measuring device (15) from the through hole (9), and the displacement measuring device (15) is used to detect the displacement between the rack and pinion (6) during the rotational engagement between the rack and pinion (7), i.e. the engagement clearance between the rack and pinion.
9. A rack and pinion clearance measuring method based on the rack and pinion clearance measuring apparatus according to claim 8, characterized by comprising the steps of:
step 1, fixing a steering gear shell (8) on a U-shaped support (14) of a rack (13);
step 2, when the gear and rack clearance measurement is carried out, the pressing block cover (1) is opened, the measuring head of the displacement measuring device (15) penetrates through the through hole (9) of the pressing block bottom (2) and is respectively arranged at two sides of the axis of the rack (6) and is close to the rack (6) but not contacted with the surface of the rack, so that the abrasion caused when the measuring head is contacted with the surface of the rack (6) is prevented;
step 3, rotating from the initial contact position of the gear (7) and the rack (6) to the final contact position, and in the rotating and meshing process of the gear (7) and the rack (6), measuring the displacement generated between the gear (7) and the rack (6) by two displacement measuring devices (15), namely the meshing gap between the gear (7) and the rack (6); when the device is positively rotated, the displacement signals generated by the displacement detected by the two displacement measuring devices (15) are x1 and x2 respectively, and the displacement values obtained by the two displacement measuring devices (15) are averaged
Then the gear (7) and the rack (6) are rotated reversely, and when the gears are rotated reversely, the gears are rotatedThe displacement measuring device (15) again detects that the displacement signals are y1 and y2 respectively, and the obtained displacement values are averaged again
And averaging the displacement average values x and y obtained twice, and taking the average value of x and y as a final gap value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110460003.3A CN113212544B (en) | 2021-04-27 | 2021-04-27 | Rack pressing device of rack and pinion steering gear and meshing clearance measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110460003.3A CN113212544B (en) | 2021-04-27 | 2021-04-27 | Rack pressing device of rack and pinion steering gear and meshing clearance measuring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113212544A CN113212544A (en) | 2021-08-06 |
| CN113212544B true CN113212544B (en) | 2022-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110460003.3A Active CN113212544B (en) | 2021-04-27 | 2021-04-27 | Rack pressing device of rack and pinion steering gear and meshing clearance measuring method |
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| CN (1) | CN113212544B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101927783B (en) * | 2010-09-02 | 2012-05-23 | 奇瑞汽车股份有限公司 | Adjusting mechanism for steering engine |
| KR101827589B1 (en) * | 2013-05-15 | 2018-02-08 | 주식회사 만도 | Rack Bar Supporting Device of Steering Apparatus for Vehicle |
| CN103818470A (en) * | 2014-03-17 | 2014-05-28 | 安徽江淮汽车股份有限公司 | Compressing adjusting mechanism for mechanical steering gear for automobile |
| CN204359275U (en) * | 2014-12-08 | 2015-05-27 | 天合汽车科技（上海）有限公司 | A kind of rack lock block gap measuring apparatus |
| CN208360281U (en) * | 2018-05-24 | 2019-01-11 | 奇瑞汽车股份有限公司 | Axial clearance compensation mechanism for input shaft of steering gear |
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2021
- 2021-04-27 CN CN202110460003.3A patent/CN113212544B/en active Active
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Effective date of registration: 20230904 Address after: 435000 No.82, Wangsheng Avenue East, Huangshi economic and Technological Development Zone, Hubei Province Patentee after: Hubei Yexin Automobile Parts Co.,Ltd. Address before: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee before: Dragon totem Technology (Hefei) Co.,Ltd. Effective date of registration: 20230904 Address after: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee after: Dragon totem Technology (Hefei) Co.,Ltd. Address before: Zhenjiang City, Jiangsu Province, 212013 Jingkou District Road No. 301 Patentee before: JIANGSU University |
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