Rack housing of power steering and manufacturing method thereof

专利摘要:
The present invention relates to a rack housing of power steering and a method of manufacturing the same, and more particularly, to reduce the weight of the rack housing by changing the material, and to perform a separate machining process using an AUTO INSERT INJECTON MOULDING method. The present invention relates to a rack housing for power steering that is singulated without use and to a method of manufacturing the same. The present invention is manufactured by manufacturing a rack housing by mixing a polyamide (Polyamide) and glass fiber (Glass Fiber) of the thermoplastic resin and heat-flow fluidized into the mold to be injected by injection molding method to produce a single unit The process can be shortened by shortening the process, and the weight of the product can be reduced by changing the material, and the cost is reduced, thereby improving productivity.
公开号:KR20000056083A
申请号:KR1019990005111
申请日:1999-02-12
公开日:2000-09-15
发明作者:오금순
申请人:밍 루；주식회사 만도；
IPC主号:

专利说明:

Rack housing for power steering and its manufacturing method {RACK HOUSING OF POWER STEERING AND MANUFACTURING METHOD THEREOF}
The present invention relates to a rack housing of power steering and a method of manufacturing the same, and more particularly, to reduce the weight of the rack housing by changing the material, and to perform a separate machining process using an AUTO INSERT INJECTON MOULDING method. The present invention relates to a rack housing for power steering that is singulated without use and to a method of manufacturing the same.
In general, power steering used in a vehicle is a power unit using the hydraulic power of the hydraulic pump driven by the engine to turn the car with a light steering force.
As the power source, there are a hydraulic pump driven by an electric motor and a method executed by the electric motor itself.
Looking at the configuration, a torsion bar for transmitting the rotational force of the steering wheel, a control valve shaft fitted to the outside of the torsion bar, a rotary valve coupled to the outside of the control valve shaft, the rotary valve is connected to the The torsion bar is composed of a pinion shaft which is fixed by a fixing pin, a pinion formed at the lower end of the pinion shaft, and a rack bar which rotates in engagement with the pinion and redirects a wheel connected by a tie rod.
The rack bar is formed with a plurality of gears meshing with the pinion on the upper surface, and meshes with the pinion to convert the rotational motion of the pinion into a linear motion to change the direction of the wheel.
The rack bar as described above is formed with a rack portion on one side, the rack is engaged with the pinion to move, the pinion coupled to the rack portion is inserted into the rack housing is installed.
At this time, the rack housing is manufactured by mass-producing the main parts of each part by machining, then machining the main parts of the parts to match the degree, and injecting the subsidiary materials and the like into the assembly.
1 is a plan view showing the shape of a conventional rack housing, the rack housing 100 is a rack bar 18 and the pinion 120 is installed so that the rotational movement of the pinion is converted into a linear movement of the rack bar is installed to move the wheel. .
In a basic configuration, a rack bar insertion unit 110 into which the rack bar 18 is inserted is formed at the right side of the body 116 of the rack housing 100, and the yoke plug is fitted in a vertical direction of the body 116. The yoke plug insertion part 112 is formed, and the pinion insertion part 114 into which the pinion 120 is inserted is formed.
The rack housing 100 is manufactured by a die casting method so as to have precision, and then the rack bar insert 110 is first machined, and the pinion insert 114 and the yoke plug insert 112 are respectively formed. After the secondary and tertiary machining, it was assembled by performing a post-pressing step of inserting the rack bar 18 into the rack bar insert 110.
The rack housing manufactured by the die casting method as described above is heavy due to the use of dies due to the characteristics of the material used for die casting, and requires a depth dimension of the grease hole formed inside the rack housing, and when applying an existing dimension (depth), the grease is applied. There was a problem in that the thickness outside the hole was thick, and an unbalanced part having different dimensions of the thickness of the outer circumferential surface of the rack bar insertion part was generated, thus making it difficult to change the internal dimensions.
In addition, the rack housing manufacturing method as described above requires a process such as a machining process and a press-fitting process after a die casting process, and thus takes a long process time, thereby causing a decrease in the productivity of parts.
Accordingly, the present invention has been made to solve the above problems, to provide a rack housing of power steering made of a thermoplastic resin mixed with polyamide and glass fiber to reduce the weight of the rack housing It is characterized by.
SUMMARY OF THE INVENTION An object of the present invention is to manufacture a rack housing of power steering for single-stacking a rack housing without a separate machining process by using an auto insert injection molding method after melt injection of a thermoplastic resin. It is characterized by providing.
It is another object of the present invention to provide a rack housing of power steering for improving productivity by allowing assembly to a body assay without machining using an auto insert injection molding method.
1 is a plan view showing the shape of a conventional rack housing
Figure 2 is a plan view showing the shape of the rack housing of the present invention
3 is a cross-sectional view taken along the line A-A of FIG.
Explanation of symbols on the main parts of the drawings
10 Rack Housing 11 Body
12 Rack Bar 14 Pinion
16 Grease Hole 18 Rack
20 bush22 yoke plug insert
24 Protrusion 26 Air bleed hole
The rack housing of the power steering of the present invention is manufactured by the die casting method of the body of the rack housing, and the manufacturing method of the rack housing in which each part is manufactured by primary processing and secondary and tertiary processing, the thermoplastic resin It is characterized by manufacturing a rack housing by heating and fluidizing the injection into a mold into the mold molding method.
The thermoplastic resin is characterized in that the mixture of polyamide (Polyamide) and glass fiber (Glass Fiber).
A rack bar insertion part is formed at one side of the body of the rack housing formed by the insert molding method, and a plurality of air vent holes are formed on the inner circumferential surface of the rack housing to allow the bush to be freely separated.
A plurality of grease holes are formed on the inner circumferential surface of the bush.
Hereinafter, with reference to the accompanying drawings illustrating a rack housing and a manufacturing method of the power steering of the present invention.
First, the thermoplastic resin is heated and fluidized and injected into a mold, thereby forming the rack housing 10 using an injection molding method.
The thermoplastic resin is characterized in that the mixture of polyamide (Polyamide) and glass fiber (Glass Fiber).
A rack bar insert 110 is formed at one side of the rack housing molded by the injection molding method, and an air bleed hole 26 is formed at the inner circumferential surface thereof so that the bush 20 can be freely separated.
Figure 2 is a plan view showing the shape of the rack housing of the present invention, Figure 3 is a cross-sectional view when the line A-A of Figure 1 cut.
The thermoplastic resin is heated and fluidized, injected into the mold by using a plunger in the cylinder, and then injected into the mold 11 of the rack housing 10, and the rack bar 12 disposed from the right side of the body 11 to the inside. The pinion insertion part 114 into which the rack bar insertion part 110 and the pinion 14 which engage with the rack part 18 of the rack bar 12 inserted in the said body 11 are inserted so that it may be inserted horizontally. And a yoke plug insertion portion 22 formed vertically above the body 11 and into which the yoke plug is inserted.
The rack housing 10 made as described above is made by converting the material of the rack housing used in the prior art into a thermoplastic resin and heating and fluidizing the same. The injection molding is performed using a molding process, and a bush 20 having a plurality of grease holes 16 formed therein is inserted into the right side of the body 11 so that lubricant can flow therein.
The rack bar 12 is inserted into the bush 20, and the pinion 14 is inserted to engage with the rack portion 18 of the rack bar 12 to be operated.
The thermoplastic resin used in the material of the rack housing is made of a mixture of polyamide (Ployamide) and glass fiber (glass fiber) to reduce the weight of the injection molded rack housing.
In addition, a plurality of air vent holes 26 are formed on the inner circumferential surface of the rack bar insertion unit 110 into which the bush 20 is inserted. Preferably, three or more air gaps are formed at intervals of 120 degrees.
In addition, the rack housing manufactured using the above-mentioned auto-injection insert molding method does not need to be machined separately, so that a single product can be quickly assembled to a main body assay.
As described above, the present invention has the effect of shortening the work cycle by shortening a number of machining processes during manufacturing by injection molding the rack housing separately, and can achieve a lighter weight of the product by changing the material, thereby Cost savings are accompanied by productivity gains.

权利要求:
Claims (2)
[1" claim-type="Currently amended] In the manufacturing method of the rack housing in which the main parts of the parts are manufactured by die casting, and each part is machined by manufacturing,
Manufacturing of the rack housing of the power steering is characterized in that the thermoplastic resin polyamide (Polyamide) and glass fiber (Glass Fiber) is mixed by heating and fluidized, injected into the mold speed and injected by injection molding method Way.
[2" claim-type="Currently amended] The rack housing of claim 1, wherein the rack housing manufactured by the insert molding method forms a plurality of air bleed holes in the inner circumferential surface of the rack bar insert formed at the right side thereof.

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同族专利:

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公开号 | 公开日

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KR100548042B1|2006-02-02|

引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
1999-02-12|Application filed by 밍 루, 주식회사 만도

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1999-02-12|Priority to KR1019990005111A

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2000-09-15|Publication of KR20000056083A

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2006-02-02|Application granted

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2006-02-02|Publication of KR100548042B1

优先权:

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申请号 | 申请日 | 专利标题

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KR1019990005111A|KR100548042B1|1999-02-12|1999-02-12|Rack housing of power steering and manufacturing method thereof|