KR20150002416A - Worm wheel for electric power steering system and method for manufacturing the same - Google Patents

Worm wheel for electric power steering system and method for manufacturing the same Download PDF

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Publication number
KR20150002416A
KR20150002416A KR1020130131895A KR20130131895A KR20150002416A KR 20150002416 A KR20150002416 A KR 20150002416A KR 1020130131895 A KR1020130131895 A KR 1020130131895A KR 20130131895 A KR20130131895 A KR 20130131895A KR 20150002416 A KR20150002416 A KR 20150002416A
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KR
South Korea
Prior art keywords
worm wheel
fastening hub
worm
fastening
stopper
Prior art date
Application number
KR1020130131895A
Other languages
Korean (ko)
Inventor
홍성종
김동민
Original Assignee
남양공업주식회사
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 남양공업주식회사 filed Critical 남양공업주식회사
Priority to PCT/KR2014/005769 priority Critical patent/WO2014209073A1/en
Publication of KR20150002416A publication Critical patent/KR20150002416A/en

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Classifications

    • 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
    • B62D3/04—Steering gears mechanical of worm type
    • 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
    • B62D5/0409—Electric motor acting on the steering column
    • 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
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
    • F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
    • F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
    • 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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
    • F16H55/24—Special devices for taking up backlash
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2304/00—Optimising design; Manufacturing; Testing
    • B60Y2304/03—Reducing weight
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/09—Reducing noise
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2410/00—Constructional features of vehicle sub-units
    • B60Y2410/12—Production or manufacturing of vehicle parts
    • B60Y2410/122—Plastic parts manufactured by moulding
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
    • F16C2380/27—Motor coupled with a gear, e.g. worm gears

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Power Steering Mechanism (AREA)
  • Gears, Cams (AREA)

Abstract

The present invention relates to a worm wheel of an electric power steering device and a method for manufacturing the same. The worm wheel of an electric power steering device comprises: a fastening hub unit having a through hole to allow a steering column of a vehicle to axially penetrate; and a worm wheel gear unit which is coupled to the edge part of the fastening hub unit to be integrated and is engaged with a worm gear of a worm shaft to add rotation power to the steering column at the external edge thereof, wherein the worm wheel gear unit is injection-molded to be integrated with the fastening hub unit, and the fastening hub unit has a molding groove that is processed to be dented in a through hole direction so that molding materials of the worm wheel gear unit can be filled along the edge, thereby making the manufacturing processes relatively simple and lightening the weight.

Description

TECHNICAL FIELD [0001] The present invention relates to a worm wheel for an electric power steering system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a worm wheel of an electric steering system and a method of manufacturing the worm wheel, and more particularly, to a worm wheel of an electric steering system and a method of manufacturing the worm wheel.

The recent trend of the steering apparatus provided in the vehicle is research and development in the direction of pursuing the convenience of the driver together with the safety such as the stability of the steering condition and the smooth and comfortable steering feeling. In accordance with this development trend, a variety of power assisted steering devices such as a hydraulic type or an electric type have been developed as a method for improving the steering feeling of a driver. As compared with the hydraulic type, the electric type is light, the energy consumption is low, The use of auxiliary steering devices is on the increase.

Generally, the electric power assist steering device drives the motor in the electronic control device according to the driving condition of the vehicle sensed by the vehicle speed sensor and the steering torque sensor to assist the driver in steering torque, thereby providing a light and comfortable steering condition at low speed , Provides a heavy and stable steering condition during high speed operation, and provides a steering performance that allows the driver to maintain an optimum steering feeling by coping with sudden emergency situations and enabling rapid steering operation.

Such an electric power assisted steering apparatus can be divided into various types depending on the mounting position. The column type electric power assist steering apparatus includes a steering wheel for fixing the steering shaft connecting the steering wheel of the driver seat to the gear box of the vehicle lower portion, And a power assist steering device having an electric motor at a column portion is provided so that the rotational force of the steering wheel operated by the driver can be transmitted to the gear box by the power assist steering device.

Fig. 1 is a cross-sectional view showing a main part of a conventional column-type electric power assisted steering apparatus, which is provided with a worm shaft 4 having a worm gear portion 2 formed at an intermediate portion thereof, The worm shaft 4 is rotated by the worm shaft 4 and the motor shaft 8 connected to each other and the worm shaft 6 is respectively installed to rotate the worm shaft 4 .

A worm wheel 4 is provided at one side of the outer diameter of the worm 2 so that the worm 2 can be engaged with the worm 2 formed at the middle portion of the worm shaft 4. The worm wheel 4 is provided with a steering wheel So that the rotational force of the worm shaft 4 due to the driving of the motor 10 is transmitted to the steering column 12. [ The worm wheel gear portion 14 and the worm shaft 4 engaged with each other by a worm gear system are mounted inside the housing 16 for protection from the outside.

An electronic control unit (not shown) provided in the vehicle controls the driving of the motor 10 according to the driving conditions of the vehicle, and the turning force of the worm shaft 4 driven by the motor 10 is transmitted to the steering wheel So that the steering operation state of the driver can be maintained smoothly and stably by being transmitted to the steering column 12. [

The worm gear 2 and the worm wheel gear portion 14 are used to transmit the driving force of the motor 10 to the steering column 12 as described above. And the worm wheel gear portion 14 are made of a metal material, noise or vibration is generated at a portion where the worm wheel gear portion 14 is in contact with each other.

Thus, the worm shaft 4 formed with the worm gear 2 is made of a metal material such as steel. The worm wheel gear portion 14 is made of a plastic material such as a boss made of metal such as steel, Is formed by integrally molding the blank.

In recent years, wear of both worm gears and worm wheel gear portions increases as the steering assist force is increased in power output. As a result, backlash can not be avoided, and vibration and rattle noise are generated by such backlash. there has been a problem in that such vibration and rattle noise are transmitted to the interior of the vehicle on the offroad, causing discomfort to the driver.

In addition, plastic blanks are pushed away from the boss due to strong friction, and a need exists for a thicker worm wheel to solve the problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a worm wheel of a motor-driven steering device and a method of manufacturing the worm wheel, which can prevent the worm wheel gear portion from being separated from the fastening hub portion and can be made lighter and thinner The purpose.

A preferred embodiment of the worm wheel and the method of manufacturing the same of the electric power assisted steering apparatus according to the present invention includes a fastening hub portion having a through hole formed therethrough so as to allow the steering column of the vehicle to pass therethrough and a fastening portion integrally joined to the rim portion of the fastening hub portion And a worm wheel gear portion which is engaged with a worm gear of a worm shaft for applying a rotational force to the steering column at an outer rim of the worm wheel gear portion. The worm wheel gear portion is integrally injection molded into the coupling hub portion, A molding groove recessed in the direction of the through hole is formed so as to fill the molding material of the worm wheel gear portion.

Here, the fastening hub portion is preferably subjected to cold forging and press working.

A plurality of the molding grooves are formed on the rim of the fastening hub portion so as to be spaced apart from each other by a predetermined distance, and a part of the fastening hub portion corresponding to the space between the molding grooves of the fastening hub portion is formed in one of the through- And a second stopper portion rounded in a direction opposite to the front end of the first stopper portion may be formed.

A preferred embodiment of the method for manufacturing a worm wheel of an electric power assisted steering apparatus according to the present invention is characterized in that a through hole through which a steering column is passed through and a through hole having a U- And a second step of bending a part of the fastening hub portion between the plurality of the molding grooves in a direction parallel to the passing direction of the through hole to mold the first stopper portion after the pressing step, And a bending process.

The bending step may further include the step of forming a second stopper part rounded in a direction opposite to the tip end of the first stopper part, and after the bending step, the injection hub part is injection- Process. ≪ / RTI >

Further, the method may further include a cold forging step of cold-forging the steel material, which is a raw material of the fastening hub part before the pressing step.

According to the preferred embodiment of the worm wheel of the electric power steering apparatus of the present invention and the method of manufacturing the worm wheel, the worm wheel gear portion is prevented from being separated from the fastening hub portion, thereby improving the reliability of the product and having stronger durability. It has the effect of making it thin and lighter.

1 is a cross-sectional view showing the main structure of a conventional column-type electric power steering apparatus,
2 is a perspective view showing a preferred embodiment of a worm wheel of an electric power steering apparatus according to the present invention,
FIG. 3 is a partially cutaway perspective view taken along line AA in FIG. 2,
4 is a cross-sectional view taken along line BB in Fig. 2,
5 is a perspective view of a fastening hub portion of a worm wheel of the electric power steering apparatus according to the present invention,
FIG. 6 is a cross-sectional view of the fastening hub portion of FIG. 5,
7 is a flowchart showing a manufacturing procedure of the worm wheel manufacturing method of the electric power assisted steering apparatus according to the present invention,
FIG. 8 is a conceptual view showing a cold forging method applied before the pressing process in the manufacturing process of FIG. 7,
9 is a conceptual view showing the bending process of FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a worm wheel and a method of manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a perspective view showing a preferred embodiment of a worm wheel of an electric power assisted steering apparatus according to the present invention, FIG. 3 is a partially cutaway perspective view taken along line AA in FIG. 2, 5 is a perspective view showing a fastening hub portion of the worm wheel of the electric power assisted steering apparatus according to the present invention, FIG. 6 is a cross-sectional view of the fastening hub portion of FIG. 5, and FIG. 7 is a cross- FIG. 8 is a conceptual view showing a cold forging method applied before a pressing process in the manufacturing process of FIG. 7, and FIG. 9 is a conceptual view showing a bending process of FIG. 7 . The conventional structure will be described with reference to the conventional reference numerals (see Fig. 1).

A preferred embodiment of the worm wheel 100 of the electric power assisted steering apparatus according to the present invention includes a fastening hub portion 110 having a through hole 105 such that the steering column 12 of the vehicle passes through the shaft, And a gear groove 125 which is integrally coupled to the rim of the worm gear shaft 110 and which is engaged with the worm gear portion 2 of the worm shaft 4 which applies a rotational force to the steering column 12 is formed on the outer rim. (120). The shaft of the steering column 12 is supported by a boss portion 119 corresponding to the inner circumferential surface of the through hole 105 of the fastening hub portion 110.

The worm gear 2 is connected to the worm gear 2 via a worm gear 4. The worm gear 2 is connected to the shaft of the drive motor 10 And a helical gear shape may be formed so as to engage with the gear groove 125 of the gear portion 120.

When the drive motor 10 is rotated, the worm gear portion 2 is rotated simultaneously with the rotation of the worm shaft 4 and the gear teeth of the worm wheel gear portion 120 engaged with the gear shape of the worm gear portion 2 The worm wheel gear portion 120 is rotated by the worm wheel gear portion 125 so that the coupling hub portion 110 is rotated so that the steering column 12 supported through the through hole 105 of the coupling hub portion 110 .

The worm wheel gear portion 120 may be made of a resin material which is injection molded integrally with the fastening hub portion 110. Accordingly, the worm wheel 100 of the electric power assisted steering apparatus according to the present invention can be advantageously reduced in weight.

On the other hand, the fastening hub portion 110 is formed of a kind of steel material through cold forging or press working. More specifically, referring to Fig. 8, the fastening hub portion 110 is processed by a cold forging method in which heat is applied to a steel material to be a raw material, processed gradually to a final shape gradually in a forging manner, and then cooled.

Although the fastening hub unit 110 according to the present invention can be manufactured only by the cold forging process or the press process, performing both the cold forging process and the press process minimizes the machining area and the machining amount and increases the dimensional accuracy of the product It is more effective.

The manufacturing process of the fastening hub part according to the present invention will be described in comparison with the prior art. According to the conventional method of manufacturing a worm wheel, the fastening hub part is manufactured by the hot forging method. However, since hot forging has a large variation in area, there is a problem that deformation occurs when the forging is not adequately controlled, and the amount of processing is increased for satisfying the dimensions, and the weight of the product is increased. Further, since the environment for hot forging is high, there are problems such as decarburization, surface defects, other scars due to scales, and the like, and the environment is deteriorated due to high-temperature operation.

In contrast, according to the present invention, the step of cold-forging the steel material, which is the raw material of the fastening hub, is applied to minimize the machining area and the machining amount, and the dimensional accuracy of the product can be greatly increased. In addition, since it shows high rigidity even at a thin thickness due to an increase in workpiece strength due to work hardening, there is an advantage that weight reduction can be achieved through weight reduction of the product.

After the cold forging process, the fastening hub portion 110 may be formed so that the through holes 105 are formed through the pressing process, as well as the forming grooves 117 to be described later are formed at the same time. That is, as shown in FIG. 9, the forming groove 117 can be formed by piercing or trimming before the bending process described later.

A plurality of molding grooves 117 may be formed in the fastening hub portion 110 so as to be recessed toward the through hole 105 so that the molding material of the worm wheel gear portion 120 penetrates along the rim. The forming groove 117 may be formed such that the substantially inward depressed portion has a "U" shape.

The worm wheel gear portion 120 is made of a resin material as described above, and is preferably manufactured by a molding method. Therefore, it is necessary to process the molding material-permeable groove for the firm fixing force (or the coupling force) between the worm wheel gear portion 120 and the fastening hub portion 110. The molding groove 117) is that.

A molding material is filled in the molding groove 117 when the molding material is poured into the mold for forming the worm wheel gear portion 120.

The plurality of molding grooves 117 may be formed to be spaced a predetermined distance apart along the rim of the fastening hub portion 110 so as to be divided into a plurality of first stopper portions 111 to be described later.

The first stopper portion 111 may be bent at a rim of the fastening hub portion 110 in a direction parallel to the through-hole 105 of the fastening hub portion 110 by a bending process .

The first stopper part 111 prevents the worm wheel gear part 120 from being outwardly (radial) and also prevents the worm wheel gear part 120 from deviating outwardly. Thus, the worm wheel gear portion 120 can be fixed to the fastening hub portion 110 with a more firm fixing force by the first stopper portion 111.

It is preferable in view of the process that the first stopper portion 111 is formed by performing a bending process in a state where the forming groove 117 is formed (i.e., after press working).

The plurality of molding grooves 117 may be formed so as to be divided into a plurality of first stopper portions 111. That is, the forming groove 117 is formed not only in the plurality of first stopper portions 111 but also in the vicinity of the adjacent stopper portions 111 in which the first stopper portions 111 are formed to prevent any flow of the fastening hub portions 110 in the circumferential direction The connecting hub portion 110 may be formed to overlap with a part of the coupling hub portion 110.

When the first stopper portion 111 is formed by the bending process, the second stopper portion 115 rounded in the opposite direction to the tip end portion of the first stopper portion 111 with the plurality of the molding grooves 117 therebetween, .

The second stopper portion 115 is configured to engage the worm wheel gear portion 120 made of resin which is injection molded together with the first stopper portion 111 in the vertical direction so that the worm wheel gear portion 120 moves outward It plays a role to prevent being leaked. The worm wheel gear portion 120 can be fixed to the fastening hub portion 110 with a more firm fixing force by the first stopper portion 111 and the second stopper portion 115. [

A preferred embodiment of the manufacturing method of the worm wheel 100 of the electric power assisted steering apparatus according to the present invention includes a through hole 105 through which the steering column 12 is passed through and a U- A pressing step S10 for pressing the fastening hub part 110 such that a plurality of forming grooves 117 of the plurality of forming grooves 117 are formed so as to face the through holes 105; And a bending step S20 of bending a part of the fastening hub part 110 in a direction parallel to the passing direction of the through hole 105 to form the first stopper part 111. [

The first stopper part 111 bent in the bending step S20 is formed by cutting a part of the fastening hub part 110 between the plurality of forming grooves 117 constituting the edge of the fastening hub part 110 I will say.

9, the bending process S20 is performed in a direction inclined by a predetermined angle (the reference numeral "in Fig. 9" is referred to as a "bending direction") so that the plurality of molding grooves 117 are included in the rim of the fastening hub portion 110, (Refer to FIG. 9) to bend the end of the rim of the bending fastening hub portion 110 in a direction opposite to that of the boss portion 119 (see FIG. 9). Particularly, when the first stopper part 111 is formed by changing the rim of the fastening hub part 110 in the "b" direction in the bending step S20, the roundness of the first stopper part 111 in the direction opposite to the front end of the first stopper part 111 The second stopper portion 115 is formed.

Here, after the bending step S20, it may further include an injection step S30 of injecting and molding the worm wheel gear part 120 integrally into the fastening hub part 110. [ The molding material to constitute the worm wheel gear portion 120 penetrates into the molding groove 117 in the injection step S30 so that the molding material is finally combined with the first stopper portion 111 to have a more firm fixing force.

Further, the injection step (S30) is preferably injection-molded by an insert injection method. That is, it is possible to manufacture a preferred embodiment of the worm wheel according to the present invention by inserting the fastening hub portion 110 into a previously prepared mold forming mold, and then pouring the molding material into the mold forming mold .

According to the manufacturing method of the worm wheel 100 of the electric power assisted steering apparatus according to the present invention, the process has a simpler but stronger fixing force and an advantage of being lightweight.

The preferred embodiments of the worm wheel and the method of manufacturing the worm wheel of the electric power assisted steering apparatus according to the present invention have been described in detail with reference to the accompanying drawings. However, it should be understood that the embodiments of the present invention are not necessarily limited to the above-described preferred embodiments, and that various modifications and equivalents may be made by those skilled in the art something to do. Therefore, it is to be understood that the true scope of the present invention is defined by the appended claims.

100: worm wheel 110: fastening hub part
111: first stopper portion 115: second stopper portion
117: forming groove 119: boss portion
120: worm wheel gear portion 125: gear groove
S10: Pressing process S20: Bending process
S30: Injection process

Claims (6)

A fastening hub portion having a through hole formed therein so that the steering column of the vehicle passes through the shaft;
And a worm wheel gear portion that is integrally coupled to a rim portion of the fastening hub portion and meshes with a worm gear of a worm shaft that applies a rotational force to the steering column on an outer rim,
Wherein the worm wheel gear portion is injection-molded integrally with the fastening hub portion, the motor-driven power assisted steering device having a molding groove recessed in the direction of the through hole so as to fill the molding material of the worm wheel gear portion along the rim, Worm wheel of the device. The method according to claim 1,
Wherein the fastening hub portion is cold forged or press-formed. The method of claim 2,
Wherein a plurality of the molding grooves are formed on the rim of the fastening hub portion so as to be spaced apart from each other at a predetermined interval,
Wherein a portion of the fastening hub portion between the forming grooves of the fastening hub portion is bent in parallel with either one of the through directions of the through holes to form the first stopper portion, And the second stopper portion is rounded to the second stopper portion. A pressing step of press-working the fastening hub so that a plurality of "U" shaped forming grooves are formed so as to face the through holes along the rim, and a through-hole through which the steering column passes;
And a bending step of bending a part of the fastening hub part between the plurality of forming grooves in a direction parallel to a passing direction of the through hole after the pressing step to form the first stopper part . The method of claim 4,
The bending step may further include the step of forming a second stopper portion rounded in the opposite direction to the front end portion of the first stopper portion,
Further comprising an injection step of injecting and molding a worm wheel gear part integrally into the fastening hub part after the bending step. The method of claim 5,
Further comprising a cold forging step of cold-forging the steel material as a raw material of the fastening hub part before the pressing step.
KR1020130131895A 2013-06-28 2013-11-01 Worm wheel for electric power steering system and method for manufacturing the same KR20150002416A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2014/005769 WO2014209073A1 (en) 2013-06-28 2014-06-27 Worm wheel for electric power steering system and method for manufacturing same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020130075284 2013-06-28
KR20130075284 2013-06-28

Publications (1)

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KR20150002416A true KR20150002416A (en) 2015-01-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019195937A (en) * 2018-05-09 2019-11-14 キヤノン株式会社 Gear, manufacturing method of the same, and injection mold used for gear manufacturing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019195937A (en) * 2018-05-09 2019-11-14 キヤノン株式会社 Gear, manufacturing method of the same, and injection mold used for gear manufacturing

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