CN103979007A - Rack pressing block for gear rack steering engine - Google Patents
Rack pressing block for gear rack steering engine Download PDFInfo
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- CN103979007A CN103979007A CN201410242933.1A CN201410242933A CN103979007A CN 103979007 A CN103979007 A CN 103979007A CN 201410242933 A CN201410242933 A CN 201410242933A CN 103979007 A CN103979007 A CN 103979007A
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- rack
- antifriction
- tooth bar
- steering engine
- pressing block
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Abstract
The invention discloses a rack pressing block for a gear rack steering engine. The rack pressing block for the gear rack steering engine is characterized in that a base body is made of aluminum alloy materials, the friction face of the base body and a mating plate rack is provided with an antifriction spraying layer, the antifriction spraying layer comprises the following materials, by mass percent, 5% to 20% of molybdenum disulfides, 2% to 5% of copper fine powder, 7% to 15% of graphite, 0.1% to 0.5% of silicon oxide fine powder, 0.5% to 10% of polytetrafluoroethene fine powder, 2% to 8% of curing agents, 0.5% to 5% of flexibilizer, and the balance epoxy resins. According to the rack pressing block for the gear rack steering engine, a composite material pressing piece is replaced by the antifriction spraying layer, the shape error of a circular arc face of the rack pressing block is reduced, the clearance fluctuation between transmission pairs is reduced, and stability of transmission pair meshing is increased; the aluminum alloy base body is adopted, the weight is about 31% to 45% of the weight of a base body in the prior art, weight reduction and consumption reduction are achieved, and the problem of rusting of an iron base body is solved, the production processes are reduced, the period is shortened, and the production cost can be reduced by 10% to 15%.
Description
Technical field
The invention belongs to Manufacturing Technology for Automotive Parts field, particularly a kind of tooth bar briquetting for rack and pinion steering gear.
Background technology
Automobile gear rack-type steering gear, its basic structure is a pair of intermeshing miniature gears and tooth bar, when steering shaft drives miniature gears rotation, tooth bar just does straight-line motion, directly drives intermediate rod by tooth bar, just can make wheel flutter turn to.Tooth bar briquetting is mainly used in regulating the gap between deflector gear and tooth bar, ensures that gear and tooth bar are with less clearance meshing, makes the engagement of rack-and-gear transmission steadily, eliminates the abnormal sound and the noise that in automobile steering device use procedure, produce.At present, pinion-and-rack steering engine briquetting generally adopts two body Combined press block structures, specifically combined by metal material matrix and composite material preforms, metal material matrix is generally iron-base powder metallurgy material, fluted on arc surface, composite material preforms is pressed into groove by certain pressure, wherein composite material preforms top layer is PTFE, centre is bronze sinter layer, bottom is steel plate (CPCC), and prior art CN202641827U and CN202449054U are all adopting this structure.This tooth bar briquette structure has adopted metal material matrix and composite material preforms to combine, and its Shortcomings part is:
1, because metal material matrix and composite material preforms rivet together by mold pressing, the distortion of composite material preforms is inconsistent, make shape and the ideal form of compressing tablet driving surface produce larger error, cause the gap fluctuation between gear and the tooth bar in steering assembly, affect the stationarity of rack-and-gear transmission engagement.
2, production process is many, the cycle is long, and cost is higher.
Summary of the invention
The present invention is for avoiding the existing weak point of above-mentioned prior art, a kind of tooth bar briquetting for pinion-and-rack steering engine is provided, object is the structure by changing tooth bar briquetting, reduces the shape error of tooth bar briquetting arc surface and improve work efficiency to reduce production costs.
Technical matters solved by the invention realizes by the following technical solutions:
The present invention is for the tooth bar briquetting of pinion-and-rack steering engine, its feature is: the material of the matrix of described tooth bar briquetting is aluminum alloy, on matrix, be provided with antifriction sprayed coating with the friction face of mating plate tooth bar, the material prescription of described antifriction sprayed coating is by mass percentage: molybdenum disulphide 5-20%, copper fine powder 2-5%, graphite 7-15%, ultrafine silica powder 0.1-0.5%, ptfe micropowder 0.5-10%, curing agent 2-8%, elasticizer 0.5-5%, surplus is epoxy resin.
The present invention is for the tooth bar briquetting of pinion-and-rack steering engine, and its feature is also:
Described curing agent is fatty amines curing agent or Imidazole Type Latent Curing Agent; Described elasticizer is amilan or nitrile rubber resin.
The thickness of described antifriction sprayed coating is 0.010～0.050mm.
Compared with existing technology, beneficial effect of the present invention is embodied in:
1, the present invention adopts friction face to be provided with antifriction sprayed coating and has substituted composite material preforms, has reduced the shape error of tooth bar briquetting arc surface, has reduced the gap fluctuation between transmission, has increased the stationarity of transmission engagement.
2, production process of the present invention reduces, and the production cycle shortens, because improving the work efficiency 10%-15% that reduces production costs.
3, tooth bar briquetting of the present invention has used aluminum alloy, and weight is prior art 36%～45%, and lighting is obvious, and automobile expendable weight is reduced to energy consumption positive contribution, and the use of aluminum alloy has solved the problem of the easy corrosion of iron-based matrix.
Brief description of the drawings
Fig. 1 is middle rack briquette structure schematic diagram of the present invention;
Number in the figure: 01 matrix, 02 antifriction sprayed coating, 03 friction face.
Detailed description of the invention
Referring to Fig. 1, the material of the matrix 01 of the present embodiment middle rack briquetting is aluminum alloy, on matrix 01, be provided with antifriction sprayed coating 02 with the friction face 03 of mating plate tooth bar, the material prescription of antifriction sprayed coating 02 is by mass percentage: molybdenum disulphide 5-20%, copper fine powder 2-5%, graphite 7-15%, ultrafine silica powder 0.1-0.5%, ptfe micropowder 0.5-10%, curing agent 2-8%, elasticizer 0.5-5%, surplus is epoxy resin.
Curing agent is fatty amines curing agent or Imidazole Type Latent Curing Agent; Elasticizer is amilan or nitrile rubber resin; The aluminum alloy materials of matrix 01, preferably: 2A12-T4 or the 2A14-T4 of Al-Cu-Mg system; Or the 6061-T4 of Al-Mg-Si system; Or the ZL111T6 of casting AL-Si-Cu system; The thickness of antifriction sprayed coating 02 is 0.010～0.050mm.
The manufacturing process of the present embodiment middle rack briquetting completes as follows:
1, matrix 01 moulding
Matrix 01 moulding is exactly the process that matrix 01 all machines, and when friction face 03 moulding, is processed as cutting.Particularly, can have two kinds of modes, first kind of way is first to use the mode of non-cutting to process aluminium base matrix, and such as casting, hot extrusion etc., the mode that re-uses cutting is processed friction face 03; The method of non-cutting, the precision of working accuracy out of reach cutting, the object of selecting cutting friction face 03 is to increase its surface accuracy; The second way is all to use the mode of cutting to machine aluminium base matrix, and material can be selected directly suitable aluminum alloy bar.
2, friction face 03 sprays
Friction face 03 spraying sprays one deck composite material exactly on the friction face 03 of the aluminium base matrix machining, and sprayed on material should have good combination with aluminium base matrix, otherwise easily comes off in friction process; There is again good antifriction characteristic.
In the present embodiment, adopt aerial spraying mode to carry out surface spraying, with spray gun, coating has evenly been sprayed on to the surface of the tooth bar briquetting friction face 03 of matrix moulding; Solidification process is, is warming up to 80-85 DEG C of insulation 40min, continues to be warming up to 120 DEG C of insulation 20-30min, continues to be warming up to 140-150 DEG C of insulation 30min, then is warming up to 180-200 DEG C of insulation 50min, finally cools to room temperature with the furnace, forms antifriction sprayed coating 02.
The preparation process of antifriction sprayed coating 02 material is:
1. preparing organic solvent according to percent by volume is: the ratio of pyrrolidone, acetone, MEK is 1:3:1.
2. preparing pulverulent mixture according to percent by weight is: molybdenum disulphide 5-20%, copper fine powder 2-5%, graphite 7-15%, ultrafine silica powder 0.1-0.5%, ptfe micropowder 0.5-10%, curing agent 2-8%, elasticizer 0.5-5%, surplus are epoxy resin.
Curing agent is selected commercially available modified amine curing agent 593 or Imidazole Type Latent Curing Agent 1202.Elasticizer is selected commercially available amilan or nitrile rubber resin.
Epoxy resin is bisphenol-A based epoxy resin, or is Bisphenol F based epoxy resin, and epoxide number is not less than 0.40; Bisphenol-A based epoxy resin is commercially available E51, E54; Bisphenol F based epoxy resin is commercially available F51, F44.
The material mixture ratio of antifriction sprayed coating 02 is in table 1.
The material mixture ratio % (quality) of table 1 antifriction sprayed coating 02
3. above-mentioned pulverulent mixture and organic solvent are mixed according to mass ratio 1:1.2～1.4; Jointly put into grinder, grind and stop 30 minutes in 8-12 minute, grinding total time is 30-40 minute, makes coating, controls temperature and be no more than 60 DEG C in process of lapping.
When 01 moulding of tooth bar briquetting matrix, select cutting, when cutting, shape error is easily controlled, and in the time of spraying, only needs to control thickness and the degree of uniformity of antifriction sprayed coating 02, and antifriction sprayed coating 02 surface just can obtain desirable shape; Use matrix 01 moulding and friction face 03 to spray the combination of two processing steps, solved in prior art shape error heavy handled problem after matrix 01 and compressing tablet pressing.
The matrix 01 of tooth bar briquetting of the present invention and antifriction sprayed coating 02, in actual use, matrix 01 and antifriction sprayed coating 02 relative position can not change, solve the insecure of the metal material matrix 01 of prior art middle rack briquetting and composite material preforms combination, affected in actual use the problem of rack-and-gear transmission engagement.
The iron-based matrix 01 of prior art middle rack briquetting, density is generally at 6.0～7.5g/cm3.Tooth bar briquetting aluminium base matrix 01 of the present invention, density is generally 2.7g/cm3, and density is approximately 36%～45% of prior art; Therefore, tooth bar briquetting of the present invention and prior art ratio, weight saving degree is obvious; Lighting can be saved the energy, such as the pinion-and-rack steering engine with tooth bar briquetting of the present invention, uses on automobile, in the situation that automobile driving speed is certain, can reduce oil consumption.In addition, the iron-based matrix 01 of tooth bar briquetting is in storage and being used, than being easier to corrosion, corrosion also can affect the use of tooth bar briquetting, and just there is not this corrosion problem in aluminium base matrix 01, reason is the fire coat that aluminum alloy surface easily forms one deck densification, has stoped the further oxidation of aluminum alloy.Further, the iron-based matrix 01 of tooth bar briquetting is generally powdered metallurgical material, and powdered metallurgical material need to mix the operations such as powder, compacting, sintering, operation is more, and the production cycle is longer, tooth bar briquetting of the present invention, operation is few, with short production cycle, improves the work efficiency 10%-15% that reduces production costs.
In order to detect the friction and wear behavior of tooth bar briquetting, the tooth bar briquetting that uses friction wear testing machine to do tooth bar briquetting of the present invention and certain factory has carried out friction-wear test, concrete test parameters is, pole reciprocating frequence is 1Hz, loading force is 400N, and reciprocating stroke is 140mm, and test temperature is 20 ± 4 DEG C, when different tests number of times, test respectively the abrasion loss of two kinds of tooth bar briquettings.The skimming wear amount data of test are in table 2.
Two kinds of tooth bar briquetting skimming wear amounts of table 2 (mm)
| Number of times | 200000 | 400000 | 600000 | 800000 | 1000000 |
| Compressing tablet (prior art) | 0.030 | 0.030 | 0.033 | 0.036 | 0.037 |
| Antifriction sprayed coating 02 (group 1) | 0.010 | 0.014 | 0.016 | 0.017 | 0.017 |
| Antifriction sprayed coating 02 (group 2) | 0.010 | 0.013 | 0.015 | 0.016 | 0.017 |
| Antifriction sprayed coating 02 (group 3) | 0.011 | 0.015 | 0.015 | 0.016 | 0.016 |
| Antifriction sprayed coating 02 (group 4) | 0.011 | 0.014 | 0.015 | 0.016 | 0.017 |
Can find out from the test results of table 2, in 200,000 times, in prior art, the abrasion loss of compressing tablet is approximately three times of antifriction sprayed coating 02 of the present invention, and due to the test initial stage, the deformation point that the salient point on tooth bar briquetting driving surface or shape error cause is more, the area of contact of friction-bar and arc surface is just little, the pressure of unit area is large, and along with the continuation of test, it is large that the area of contact of friction-bar and arc surface can become, this shows, the shape error of antifriction sprayed coating 02 is better than compressing tablet; Along with the prolongation of time, the abrasion loss of every 200,000 times lowers gradually, and the abrasion loss of every 200,000 times of compressing tablet and antifriction sprayed coating 02 reaches unanimity gradually, and this wear-resisting effect that shows compressing tablet and antifriction sprayed coating 02 is similar.When test reaches 1,000,000 times, the abrasion loss of antifriction sprayed coating 02 is significantly less than the abrasion loss of compressing tablet, is approximately 36% of compressing tablet abrasion loss.Can illustrate and use tooth bar briquetting of the present invention compared to the prior art by this experiment, can reduce the gap fluctuation between transmission, increase the stationarity of transmission engagement.
Claims (3)
1. the tooth bar briquetting for pinion-and-rack steering engine, it is characterized in that: the material of the matrix (01) of described tooth bar briquetting is aluminum alloy, matrix (01) friction face (03) upper and mating plate tooth bar is provided with antifriction sprayed coating (02), the material prescription of described antifriction sprayed coating (02) is by mass percentage: molybdenum disulphide 5-20%, copper fine powder 2-5%, graphite 7-15%, ultrafine silica powder 0.1-0.5%, ptfe micropowder 0.5-10%, curing agent 2-8%, elasticizer 0.5-5%, surplus is epoxy resin.
2. the tooth bar briquetting for pinion-and-rack steering engine according to claim 1, is characterized in that: described curing agent is fatty amines curing agent or Imidazole Type Latent Curing Agent; Described elasticizer is amilan or nitrile rubber resin.
3. the tooth bar briquetting for pinion-and-rack steering engine according to claim 1 and 2, is characterized in that: the thickness of described antifriction sprayed coating (02) is 0.010～0.050mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410242933.1A CN103979007B (en) | 2014-06-03 | 2014-06-03 | A kind of rack lock block for pinion-and-rack steering engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410242933.1A CN103979007B (en) | 2014-06-03 | 2014-06-03 | A kind of rack lock block for pinion-and-rack steering engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103979007A true CN103979007A (en) | 2014-08-13 |
| CN103979007B CN103979007B (en) | 2016-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410242933.1A Active CN103979007B (en) | 2014-06-03 | 2014-06-03 | A kind of rack lock block for pinion-and-rack steering engine |
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Cited By (4)
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|---|---|---|---|---|
| US20160369837A1 (en) * | 2015-06-16 | 2016-12-22 | Honda Motor Co., Ltd. | Ball joint assembly having friction coated components and methods of assembling a ball joint assembly having defined gaps |
| CN108423061A (en) * | 2018-04-24 | 2018-08-21 | 联禾厚普（太仓）精密机械有限公司 | A kind of turning machine friction control component |
| CN109311503A (en) * | 2016-06-30 | 2019-02-05 | 本田技研工业株式会社 | Vehicle rack and pinion structure |
| CN114060485A (en) * | 2021-11-08 | 2022-02-18 | 中汽创智科技有限公司 | Clearance adjusting device and rack and pinion steering gear |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160369837A1 (en) * | 2015-06-16 | 2016-12-22 | Honda Motor Co., Ltd. | Ball joint assembly having friction coated components and methods of assembling a ball joint assembly having defined gaps |
| JP2017009114A (en) * | 2015-06-16 | 2017-01-12 | 本田技研工業株式会社 | Ball joint assembly with friction coating type component and method for assembling ball joint assembly having specified clearance |
| US10247228B2 (en) * | 2015-06-16 | 2019-04-02 | Honda Motor Co., Ltd. | Ball joint assembly having friction coated components and methods of assembling a ball joint assembly having defined gaps |
| CN109311503A (en) * | 2016-06-30 | 2019-02-05 | 本田技研工业株式会社 | Vehicle rack and pinion structure |
| CN108423061A (en) * | 2018-04-24 | 2018-08-21 | 联禾厚普（太仓）精密机械有限公司 | A kind of turning machine friction control component |
| CN114060485A (en) * | 2021-11-08 | 2022-02-18 | 中汽创智科技有限公司 | Clearance adjusting device and rack and pinion steering gear |
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| Publication number | Publication date |
|---|---|
| CN103979007B (en) | 2016-09-21 |
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