CN103979007B - A kind of rack lock block for pinion-and-rack steering engine - Google Patents
A kind of rack lock block for pinion-and-rack steering engine Download PDFInfo
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- CN103979007B CN103979007B CN201410242933.1A CN201410242933A CN103979007B CN 103979007 B CN103979007 B CN 103979007B CN 201410242933 A CN201410242933 A CN 201410242933A CN 103979007 B CN103979007 B CN 103979007B
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Abstract
The invention discloses a kind of rack lock block for pinion-and-rack steering engine, the material that it is characterized in that matrix is aluminium alloy, on matrix, the rubbing surface with mating plate tooth bar is provided with antifriction sprayed coating, the material prescription of antifriction sprayed coating is by mass percentage: molybdenum bisuphide 5 20%, copper fine powder 2 5%, graphite 7 15%, ultrafine silica powder 0.1 0.5%, ptfe micropowder 0.5 10%, firming agent 2 8%, toughener 0.5 5%, and surplus is epoxy resin.The present invention uses antifriction sprayed coating alternative composite material preforms, decreases the form error of rack lock block arc surface, reduces the gap fluctuations between transmission, adds the stationarity of transmission engagement；Using alloy matrix aluminum, its weight is approximately the 31%～45% of prior art, can lower consumption by loss of weight, and the problem solving iron-based body corrosion；Because of production process reduce, cycle time, it is possible to decrease production cost 10% 15%.
Description
Technical field
The invention belongs to Manufacturing Technology for Automotive Parts field, particularly to a kind of rack lock block for rack and pinion steering gear.
Background technology
Automobile gear rack-type steering gear, its basic structure is a pair intermeshing little gear and tooth bar, and steering spindle drives little
When gear rotates, tooth bar just moves along a straight line, and directly drives drag link by tooth bar, so that it may make deflecting roller turn to.Rack lock block
It is mainly used in regulating the gap between steering gear gear and tooth bar, it is ensured that gear and tooth bar, with less clearance meshing, make gear teeth
The engagement of bar transmission steadily, eliminates the abnormal sound and noise produced during automobile steering device uses.At present, pinion-and-rack steering engine
The commonly used two body Combined press block structures of briquetting, are specifically combined by metal material matrix and composite material preforms, metal
Material matrix is generally iron-base powder metallurgy material, fluted on arc surface, and composite material preforms is recessed by certain pressure press-in
Groove, wherein composite material preforms top layer is PTFE, and centre is bronze sinter layer, and bottom is steel plate (CPCC), prior art CN
202641827U and CN202449054U is all using this structure.This rack lock block structure have employed metal material matrix
Combine with composite material preforms, in place of its Shortcomings be:
1, riveted together by mold pressing due to metal material matrix and composite material preforms, the deformation of composite material preforms
Inconsistent, make the shape of tabletting work surface and ideal form produce bigger error, cause the gear in steering assembly and tooth bar
Between gap fluctuations, affect rack pinion pair engagement stationarity.
2, production process is many, the cycle is long, relatively costly.
Summary of the invention
The present invention is for avoiding the weak point existing for above-mentioned prior art, it is provided that a kind of tooth bar for pinion-and-rack steering engine
Briquetting, it is therefore an objective to by changing the structure of rack lock block, the form error and the raising working (machining) efficiency that reduce rack lock block arc surface are come
Reduce production cost.
Technical problem solved by the invention realizes by the following technical solutions:
The present invention is for the rack lock block of pinion-and-rack steering engine, and its feature is: the material of the matrix of described rack lock block is aluminum
Alloy, on matrix, the rubbing surface with mating plate tooth bar is provided with antifriction sprayed coating, and the material prescription of described antifriction sprayed coating presses quality
Percentage ratio is: molybdenum bisuphide 5-20%, copper fine powder 2-5%, graphite 7-15%, ultrafine silica powder 0.1-0.5%, polytetrafluoro
Ethylene micropowder 0.5-10%, firming agent 2-8%, toughener 0.5-5%, surplus is epoxy resin.
The present invention is for the rack lock block of pinion-and-rack steering engine, and its feature lies also in:
Described firming agent is fatty amines firming agent or Imidazole Type Latent Curing Agent；Described toughener be polyamide or fourth fine
Rubber resin.
The thickness of described antifriction sprayed coating is 0.010～0.050mm.
Compared with existing technology, the present invention has the beneficial effect that:
1, the present invention uses rubbing surface to be provided with antifriction sprayed coating and instead of composite material preforms, decreases the shape of rack lock block arc surface
Shape error, reduces the gap fluctuations between transmission, adds the stationarity of transmission engagement.
2, production process of the present invention reduces, and the production cycle shortens, and reduces production cost 10%-15% because improving working (machining) efficiency.
3, rack lock block of the present invention employs aluminium alloy, and weight is the 36%～45% of prior art, and lighting is obvious, to automobile
Alleviate weight reduction energy consumption and have a positive contribution, and the problem that the use of aluminium alloy solves the easy corrosion of iron-based matrix.
Accompanying drawing explanation
Fig. 1 is middle rack briquette structure schematic diagram of the present invention；
Label in figure: 01 matrix, 02 antifriction sprayed coating, 03 rubbing surface.
Detailed description of the invention
Seeing Fig. 1, the material of the matrix 01 of the present embodiment middle rack briquetting is aluminium alloy, with mating plate tooth bar on matrix 01
Rubbing surface 03 is provided with antifriction sprayed coating 02, and the material prescription of antifriction sprayed coating 02 is by mass percentage: molybdenum bisuphide
5-20%, copper fine powder 2-5%, graphite 7-15%, ultrafine silica powder 0.1-0.5%, ptfe micropowder 0.5-10%,
Firming agent 2-8%, toughener 0.5-5%, surplus is epoxy resin.
Firming agent is fatty amines firming agent or Imidazole Type Latent Curing Agent；Toughener is polyamide or nitrile rubber resin；
The aluminum alloy materials of matrix 01, preferably: 2A12-T4 or 2A14-T4 of Al-Cu-Mg system；Or Al-Mg-Si system
6061-T4；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 molding
Matrix 01 molding is exactly the process that matrix 01 all machines, and is processed as machining during rubbing surface 03 molding.Tool
Body in fact, can have two ways, and first kind of way is that the mode first using non-cutting processing processes aluminum-based matrix, such as casting,
Hot extrusions etc., the mode re-using machining processes rubbing surface 03；The method of non-cutting processing, machining accuracy does not reaches cutting
The precision of processing, selects the purpose of machining rubbing surface 03 to be to increase its surface accuracy；The second way is all to use cutting
The mode of processing machines aluminum-based matrix, and material can select the most suitably aluminium alloy bar.
2, rubbing surface 03 sprays
Rubbing surface 03 spraying sprays one layer of composite, sprayed on material exactly on the rubbing surface 03 of the aluminum-based matrix machined
Should there is good combination with aluminum-based matrix, otherwise easily come off in friction process；There is good friction reduction characteristics again.
The present embodiment uses aerial spraying mode carry out surface spraying, with spray gun, coating even application is completed matrix molding
The surface of rack lock block rubbing surface 03；Solidification process is, is warming up to 80-85 DEG C of insulation 40min, is continuously heating to 120 DEG C of insulations
20-30min, is continuously heating to 140-150 DEG C of insulation 30min, then is warming up to 180-200 DEG C of insulation 50min, last furnace cooling
To room temperature, i.e. form antifriction sprayed coating 02.
The preparation process of antifriction sprayed coating 02 material is:
1. preparing organic solvent according to percent by volume is: ketopyrrolidine, acetone, the ratio of butanone are 1:3:1.
2. preparing pulverulent mixture according to mass percent is: molybdenum bisuphide 5-20%, copper fine powder 2-5%, graphite 7-15%,
Ultrafine silica powder 0.1-0.5%, ptfe micropowder 0.5-10%, firming agent 2-8%, toughener 0.5-5%, surplus are
Epoxy resin.
Firming agent selects commercially available modified amine curing agent 593 or Imidazole Type Latent Curing Agent 1202.Toughener is selected commercially available
Polyamide or nitrile rubber resin.
Epoxy resin is bisphenol A type epoxy resin, or is bisphenol F type epoxy resins, and epoxide number is not less than 0.40；Bisphenol-A class ring
Epoxy resins is commercially available E51, E54；Bisphenol F type epoxy resins is commercially available F51, F44.
The material mixture ratio of antifriction sprayed coating 02 is shown 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,
Grinding 8-12 minute and stop 30 minutes, grinding total time is 30-40 minute, i.e. prepares coating, controls temperature in process of lapping
Less than 60 DEG C.
During rack lock block matrix 01 molding, selecting machining, during machining, form error is easily controlled, when spraying, only
Need to control thickness and the uniformity coefficient of antifriction sprayed coating 02, antifriction sprayed coating 02 surface is obtained with preferable shape；Use
Matrix 01 molding and rubbing surface 03 spray the combination of two processing steps, solve in prior art after matrix 01 and tabletting pressing
The unmanageable problem of form error.
The matrix 01 of rack lock block of the present invention and antifriction sprayed coating 02, in actual use, matrix 01 and antifriction
The relative position of sprayed coating 02 will not change, and solves metal material matrix 01 and the composite pressure of prior art middle rack briquetting
It is insecure that sheet combines, the problem affecting the engagement of rack pinion pair in actual use.
The iron-based matrix 01 of prior art middle rack briquetting, density is typically 6.0～7.5g/cm3.Rack lock block of the present invention is selected
Aluminum-based matrix 01, density is generally 2.7g/cm3, and density is approximately the 36%～45% of prior art；Therefore, tooth bar pressure of the present invention
Block and prior art ratio, weight saving degree is obvious；Lighting can save the energy, such as having rack lock block of the present invention
Pinion-and-rack steering engine, uses on automobile, in the case of automobile driving speed is certain, can reduce oil consumption.It addition, tooth
The iron-based matrix 01 of bar briquetting, storage and use when, is easier corrosion, and corrosion also can affect making of rack lock block
With, and the most there is not this corrosion problem in aluminum-based matrix 01, reason is that aluminum alloy surface easily forms one layer of fine and close oxide-film,
Prevent the further oxidation of aluminium alloy.Further, iron-based matrix 01 generally powdered metallurgical material, the powder metallurgy of rack lock block
Material need mixed powder, suppress, the operation such as sintering, operation is more, and the production cycle is longer, rack lock block of the present invention, operation is few,
With short production cycle, improve working (machining) efficiency and reduce production cost 10%-15%.
In order to detect the friction and wear behavior of rack lock block, friction wear testing machine is used to do rack lock block and certain factory of the present invention
Rack lock block has carried out friction-wear test, and concrete test parameters is, pole reciprocating frequence is 1Hz, and loading force is 400N,
Reciprocating stroke is 140mm, and test temperature is 20 ± 4 DEG C, during different tests number of times, tests two kinds of rack lock block respectively
Wear extent.The frictional wear amount data of test are shown in Table 2.
2 two kinds of rack lock block frictional wear amount (mm) of table
| Number of times | 200000 | 400000 | 600000 | 800000 | 1000000 |
| Tabletting (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 |
From the result of the test of table 2 it can be seen that when at 200,000 times, in prior art, the wear extent of tabletting is approximately the present invention and subtracts
Rub three times of sprayed coating 02, and due to the test initial stage, the deformation point that salient point on rack lock block work surface or form error cause is relatively
Many, friction-bar is the least with the contact area of arc surface, and the pressure of unit are is big, along with the continuation of test, friction-bar and circular arc
The contact area in face can become big, it can thus be seen that the form error of antifriction sprayed coating 02 is better than tabletting；Over time
Extending, the wear extent of every 200,000 times gradually lowers, and the wear extent of every 200,000 times of tabletting and antifriction sprayed coating 02 gradually becomes
In unanimously, this shows that tabletting is similar with the abrasion resistant effect of antifriction sprayed coating 02.When test reaches 1,000,000 times, antifriction sprayed coating
The wear extent of 02 is significantly less than the wear extent of tabletting, is approximately the 36% of tabletting wear extent.Can illustrate to use this by this experiment
Bright described rack lock block is compared to the prior art, it is possible to reduce the gap fluctuations between transmission, increases the flat of transmission engagement
Stability.
Claims (3)
1., for a rack lock block for pinion-and-rack steering engine, it is characterized in that: the material of the matrix (01) of described rack lock block
For aluminium alloy, upper and mating plate tooth bar the rubbing surface (03) of matrix (01) is provided with antifriction sprayed coating (02), and described antifriction is sprayed
The material prescription of coating (02) is by mass percentage: molybdenum bisuphide 5-20%, copper fine powder 2-5%, graphite 7-15%, oxygen
SiClx micropowder 0.1-0.5%, ptfe micropowder 0.5-10%, firming agent 2-8%, toughener 0.5-5%, surplus is ring
Epoxy resins.
Rack lock block for pinion-and-rack steering engine the most according to claim 1, is characterized in that: described firming agent is fat
Fat amine curing agent or Imidazole Type Latent Curing Agent；Described toughener is polyamide or nitrile rubber resin.
Rack lock block for pinion-and-rack steering engine the most according to claim 1 and 2, is characterized in that: described antifriction is sprayed
The thickness of 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 |
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| CN103979007A CN103979007A (en) | 2014-08-13 |
| CN103979007B true 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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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007176242A (en) * | 2005-12-27 | 2007-07-12 | Nsk Ltd | Rack and pinion type steering device |
| CN101125995A (en) * | 2007-09-28 | 2008-02-20 | 王新虎 | Screw thread adhesion abrasion resisting self-lubricating coating and preparation method thereof |
| CN202449054U (en) * | 2011-11-29 | 2012-09-26 | 浙江万达汽车方向机有限公司 | Rack press block for automobile steering device |
| CN102555345B (en) * | 2012-01-13 | 2014-07-09 | 合肥波林新材料有限公司 | Three-layer composite self-lubricating plate and manufacture method thereof |
| DE102012104583A1 (en) * | 2012-05-29 | 2013-12-05 | Zf Lenksysteme Gmbh | Pressure element, used in electric power steering system of motor vehicle, comprises hard material coating that is applied on pressure element by chemical or physical vapor deposition and contains carbon as alloying element and hydrogen |
| CN103818451A (en) * | 2012-11-17 | 2014-05-28 | 重庆龙润汽车转向器有限公司 | Steering gear pressing block |
| CN103214920B (en) * | 2013-04-11 | 2015-04-01 | 上海亿霖润滑材料有限公司 | Automatic-door threaded rod and anti-friction coating thereof as well as spraying method of anti-friction coating |
| CN103305109B (en) * | 2013-06-04 | 2015-12-23 | 彭文表 | A kind of PU wear-resistant paint |
| CN103481939A (en) * | 2013-10-10 | 2014-01-01 | 富奥汽车零部件股份有限公司 | Gear rack gap regulating mechanism |
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