KR20100023587A - Steering device with variable gear ratio - Google Patents

Steering device with variable gear ratio Download PDF

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Publication number
KR20100023587A
KR20100023587A KR1020080082441A KR20080082441A KR20100023587A KR 20100023587 A KR20100023587 A KR 20100023587A KR 1020080082441 A KR1020080082441 A KR 1020080082441A KR 20080082441 A KR20080082441 A KR 20080082441A KR 20100023587 A KR20100023587 A KR 20100023587A
Authority
KR
South Korea
Prior art keywords
wheel
steering
gear
rack
circumferential pitch
Prior art date
Application number
KR1020080082441A
Other languages
Korean (ko)
Inventor
허진혁
Original Assignee
현대자동차주식회사
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 현대자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR1020080082441A priority Critical patent/KR20100023587A/en
Publication of KR20100023587A publication Critical patent/KR20100023587A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/16—Steering columns
    • B62D1/166—Means changing the transfer ratio between steering wheel and steering gear
    • 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
    • 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
    • B62D5/008—Changing the transfer ratio between the steering wheel and the steering gear by variable supply of energy, e.g. by using a superposition gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2304/00—Optimising design; Manufacturing; Testing
    • B60Y2304/05—Reducing production costs, e.g. by redesign

Abstract

PURPOSE: A gear ratio-variable steering system is provided to improve control stability in the high speed motion of a vehicle by forming a small circumferential pitch portion at center of a rack bar. CONSTITUTION: A gear ratio-variable steering system comprises a steering driven gear(11) for a left wheel, a steering driven gear(12) for a right wheel, and two steering drive gears(13a,13b). The steering driven gears for the left wheel and the right wheel separately steers a left wheel and a right wheel of a vehicle. The steering drive gears are respectively engaged with the steering driven gear for the left wheel and the steering driven gear for the right wheel. The steering drive gear is connected to the steering wheel.

Description

Steering device with variable gear ratio

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable gear ratio steering apparatus, and more particularly, to a gear ratio variable steering apparatus in which independent steering is provided by a left wheel rack gear and a right wheel rack gear having relatively small neutral steering gear ratios of a steering wheel.

As shown in FIG. 1, a conventional steering device of a vehicle includes a steering wheel 1 protruding toward a driver's seat so that a driver can manipulate a driving direction of the vehicle, and a steering wheel 1 integrally with the steering wheel to transmit an operating force of the steering wheel. A gear box (3) having a steering column (2) and a column shaft connected to be rotated and a steering gear that is moved left and right by receiving rotational force of the column shaft, and one end of which is to receive the left and right motions of the gear built into the gear box. A tie rod 4 connected to the gear and a knuckle 5 coupled to the other end of the tie rod 4 and coupled to the left and right wheels are provided.

2 shows an inner cross section of the gearbox, in which a rack bar 7 is formed so that rack gears engage with a pinion gear 6 that is integrally rotated through the steering handle 1 and a column shaft. It is installed to be movable.

Accordingly, when the driver rotates the steering wheel 1 in the clockwise or counterclockwise direction, the column shaft rotates together to rotate the pinion gear, and the rack bar rotates in the width direction of the vehicle according to the rotation of the pinion gear. The vehicle is steered through the knuckle coupled to the wheel through a tie rod connected to the rack bar while moving left or right along the wheel.

The rack bar and the pinion gear of the rack bar have a constant gear ratio. Recently, steering devices having a variable gear ratio have been developed and applied to improve the steering handle operation and to improve the driving stability of the vehicle. Has the disadvantage of increasing the weight and cost of the vehicle.

Accordingly, the present invention has been made in view of the above circumstances, and when the vehicle is in neutral steering, the gear ratio can be set to be small to optimize the responsiveness of the vehicle and the side slip angle of the wheel, and the independent steering system of the left and right wheels has a simple structure. It is an object of the present invention to provide a gear ratio variable steering device that can be configured at low cost.

The present invention for achieving the above object, the left-wheel steering gear and the right-wheel steering gear for steering the left and right wheels of the vehicle independently of each other, the left-wheel steering gear and the right-wheel steering gear, respectively. It has two steering drive gears connected to the steering wheel.

Preferably, the left-wheel steering gear, the right-wheel steering gear and the two steering drive gears are each provided with a small circumferential pitch and a large circumferential pitch.

The left-wheel steering gear and the right-wheel steering gear are rack wheels for the left wheel and rack wheels for which the rack gears are formed, respectively. The circumferential pitch is formed on the left and right sides of the wish circumferential pitch portion, and the wish circumference pitch is formed on the left side at the center portion along the longitudinal direction of the right wheel rack bar. An additional portion is formed, and the two steering drive gears are worm wheel gears meshed with the rack gears.

According to the gear ratio variable steering apparatus according to the present invention, the rack bar for the left wheel and the rack bar for the right wheel are independently formed, and a small circumferential pitch is formed at the center of each rack bar, and the vehicle is driven at high speed. In addition to improving steering stability, the vehicle has a tendency to understeer when turning the vehicle, optimizing the side slip angle, thereby improving turning stability and steering response.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 shows a configuration of a gear ratio variable steering apparatus according to the present invention, that is, a left wheel rack bar 11 and a right wheel rack bar for steering a right wheel as a steering driven gear for steering a left wheel of a vehicle. ) Are formed independently of each other and arranged next to each other inside the steering gear box.

The left wheel bar 11 and the right wheel bar 12 are respectively connected to the knuckle of the wheel through a tie rod (not shown), so that the left wheel bar 11 moves when the inside of the steering gear box moves. The left wheel is steered through the knuckle through the tie rods connected to the rack bar, and the right wheel is steered through the knuckle through the tie rods connected to the right rack bar 12 when the right rack bar 12 moves.

Therefore, the left wheel and the right wheel will be independently steered through the rack bars 11 and 12.

Rack gears are formed in the left wheel rack bar 11 and the right wheel rack bar 12, respectively, and the worm wheel gears 13a and 13b are meshed with the rack gear as steering drive gears, and the worm wheel gears 13a and 13b. ) Is connected to the steering wheel through the steering column shaft 14, and as the driver operates the steering wheel, the operating force is passed through the worm wheel gears 13a and 13b through the steering column shaft to the right of the rack bar 11 for the left wheel. It is transmitted to the wheel rack bar 12, the left wheel rack bar 11 and the right wheel rack bar 12 are moved independently to steer the left wheel and right wheel.

In the center portion along the longitudinal direction of the left wheel bar 11 for wheels, as shown in detail in FIG. 4, a circumferential pitch that is relatively small between the gears is formed, and a circumferential pitch portion 11a is formed. On the left and right sides of (11a), a circumferential pitch portion 11b having a circumferential pitch relatively larger than the circumferential pitch of the wish column pitch portion 11a is formed.

The circumferential pitch between the gears in the small column pitch part 11a is the same, and the circumferential pitch between the gears in the large column pitch part 11b is the same.

In addition, a wish column pitch portion 12a having a relatively small circumferential pitch is formed on the left side in a central portion along the longitudinal direction of the rack bar 12 for the right wheel, and the wish column pitch portion 12a on both left and right sides of the wish column pitch portion 12a. A circumferential pitch portion 12b having a circumferential pitch relatively larger than the circumferential pitch of) is formed, and the circumferential pitch between the gears in the small circumferential pitch portion 12a is the same and within the circumferential pitch portion 12b. The circumferential pitch between each gear is the same at.

In addition, although not shown in detail in the worm wheel gears 13a and 13b meshing with the rack gears of the rack bars 11 and 12, the wish column pitch portions corresponding to the wish column pitches and the column column pitches of the rack bars 11 and 12, respectively. And major circumferential pitch portions are formed, respectively.

Accordingly, as shown in FIG. 5, when the driver rotates the steering wheel to the left, for example, to steer the vehicle to the left from the neutral steering state, the left rack bar 11 connected to the left wheel has its wish pitch 11a. Is engaged with the worm wheel gear 13a and moves to the left while pushing the left wheel, and the right rack bar 12 connected to the right wheel has its circumferential pitch portion 12a engaged with the worm wheel gear 13b to the left. The right wheel is pulled inward while moving to the left wheel rack bar 11, and the moving distance of the left wheel rack bar 12 is relatively smaller than that of the right wheel rack bar 12.

That is, the rack bar 11 for the left wheel is engaged with the worm wheel gear 13a via the wish circumferential pitch part 11a and moved by the worm wheel gear, while the right wheel rack bar 12 moves the circumferential pitch part 12b. As the worm wheel gear 13b is engaged with each other and moved by the worm wheel gear, the rack wheel for the left wheel moves relatively smaller by the difference in the circumferential pitch than the rack wheel for the right wheel.

Therefore, when steering the vehicle to the left side, the right wheel outside the turning is steered relatively larger than the left wheel inside the turning, and the vehicle has an understeer tendency and the side slip angle is optimized, thereby improving the response and steering stability of the vehicle.

On the other hand, when the vehicle is steered in a slight range to the left and right in a neutral steering state, the wish pitch of each rack bar is engaged with the worm wheel gear and the gear ratio becomes small, so that the stability of the neutral steering normally used when the vehicle is traveling at high speed Will improve.

1 is a schematic configuration diagram of a steering apparatus according to the prior art,

2 is a detailed view of a steering gear according to the prior art,

3 is a block diagram of a gear ratio variable steering apparatus according to the present invention,

4 is a front view of FIG. 3;

5 is an explanatory view of the operation of the gear ratio variable steering apparatus according to the present invention.

<Description of Symbols for Main Parts of Drawings>

11, 12-rack bar 13a, 13b-worm wheel gear

14-steering column shaft

Claims (3)

It is provided with two steering drive gears connected to the steering wheel while being engaged with the left-wheel steering gear and the right-wheel steering gear for steering the left and right wheels of the vehicle independently of each other, and the left-wheel steering gear and the right-wheel steering gear, respectively. One gear ratio variable steering. The gear ratio variable steering apparatus according to claim 1, wherein the left wheel steering gear, the right wheel steering gear, and the two steering drive gears each have a small circumferential pitch and a large circumferential pitch. The left wheel steering gear and the right wheel steering gear are rack rack bars and right wheel rack bars each having a rack gear formed therein, and the wish circumferential pitch on the right side in a central portion of the left wheel rack bar along the longitudinal direction of the rack wheel. In addition to the formation of the main circumferential pitch portion is formed on the left and right sides of the wish circumferential pitch portion, the wish circumference pitch portion is formed on the left side in the central portion along the longitudinal direction of the rack bar for the right wheel, The large circumferential pitch portion is formed, and the two steering drive gears are gear ratio variable steering apparatus, characterized in that the worm wheel gear meshing with the rack gear.
KR1020080082441A 2008-08-22 2008-08-22 Steering device with variable gear ratio KR20100023587A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020080082441A KR20100023587A (en) 2008-08-22 2008-08-22 Steering device with variable gear ratio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080082441A KR20100023587A (en) 2008-08-22 2008-08-22 Steering device with variable gear ratio

Publications (1)

Publication Number Publication Date
KR20100023587A true KR20100023587A (en) 2010-03-04

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ID=42175806

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020080082441A KR20100023587A (en) 2008-08-22 2008-08-22 Steering device with variable gear ratio

Country Status (1)

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KR (1) KR20100023587A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101991727B1 (en) 2018-01-03 2019-06-21 공주대학교 산학협력단 Steering limiting device
KR20200055861A (en) 2018-11-13 2020-05-22 김상대 Method for production of king oyster mushroom ssampi with matsutake flavor
CN112690132A (en) * 2020-12-14 2021-04-23 山东省农业科学院植物保护研究所 Peanut synergist discharges device suitable for field

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101991727B1 (en) 2018-01-03 2019-06-21 공주대학교 산학협력단 Steering limiting device
KR20200055861A (en) 2018-11-13 2020-05-22 김상대 Method for production of king oyster mushroom ssampi with matsutake flavor
CN112690132A (en) * 2020-12-14 2021-04-23 山东省农业科学院植物保护研究所 Peanut synergist discharges device suitable for field

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