KR20120138452A - Steering gear for vehicles - Google Patents

Steering gear for vehicles Download PDF

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Publication number
KR20120138452A
KR20120138452A KR1020110057933A KR20110057933A KR20120138452A KR 20120138452 A KR20120138452 A KR 20120138452A KR 1020110057933 A KR1020110057933 A KR 1020110057933A KR 20110057933 A KR20110057933 A KR 20110057933A KR 20120138452 A KR20120138452 A KR 20120138452A
Authority
KR
South Korea
Prior art keywords
worm
wheel
worm shaft
steering
shaft
Prior art date
Application number
KR1020110057933A
Other languages
Korean (ko)
Inventor
김희진
Original Assignee
현대모비스 주식회사
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 현대모비스 주식회사 filed Critical 현대모비스 주식회사
Priority to KR1020110057933A priority Critical patent/KR20120138452A/en
Publication of KR20120138452A publication Critical patent/KR20120138452A/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
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/20—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application
    • B62D5/24—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application for worm type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • B62D6/08—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
    • B62D6/10—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque characterised by means for sensing or determining torque
    • 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
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H2057/0213—Support of worm gear shafts

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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)

Abstract

PURPOSE: A steering device for a vehicle is provided to reduce noise generated when a steering wheel is operated and to prevent the degradation of steering performance. CONSTITUTION: A steering device for a vehicle comprises a housing(10), a worm wheel(52), a worm shaft(30), and a friction control part(70). A driving shaft(50) to which a steering wheel is connected is installed in the housing. A mounting hole part is formed in the housing to face a bearing. The worm wheel is connected to the driving shaft. The worm shaft is connected to a motor(32) installed in the housing and is gear-connected to the worm wheel. The bearing is installed in the worm shaft. The friction control part presses the worm shaft to control frictional force between the worm wheel and the worm shaft.

Description

Vehicle Steering {STEERING GEAR FOR VEHICLES}

The present invention relates to a vehicle steering apparatus, and more particularly, to a vehicle steering apparatus capable of reducing noise generated when operating a steering wheel and preventing steering performance from being lowered.

In general, a vehicle steering device uses a power steering device that assists the driver's steering wheel.

The power steering apparatus includes a hydraulic power steering apparatus for generating hydraulic pressure and assisting the steering wheel operating force of the driver, and an electric power steering apparatus for assisting the steering wheel operating force of the driver using the rotational force of the motor.

In the electric power steering system, the electronic control unit drives the motor according to the driving conditions of the vehicle detected by the vehicle speed sensor and the steering torque sensor, so that the steering assistance force is increased so that the steering wheel's operation force becomes light during the low speed operation of the vehicle.

In addition, during high speed driving, the steering assistance force is reduced so that the driving force of the steering wheel becomes heavy, so that driving stability can be achieved, and rapid steering can be achieved in an emergency situation.

The operating force of the steering wheel as described above is determined according to the friction force magnitude between the worm shaft and the worm wheel.

The technical structure described above is a background technique for assisting the understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

A general vehicle steering apparatus has a problem in that noise generated during steering operation is increased when the frictional force between the worm shaft and the worm wheel is reduced, and steering performance is deteriorated when the frictional force between the worm shaft and the worm wheel is increased.

Therefore, there is a need for improvement.

It is an object of the present invention to provide a vehicle steering apparatus which can reduce noise generated when operating a steering wheel and prevent steering performance from being degraded.

The present invention in order to achieve the above object, the drive shaft is connected to the drive shaft is installed; A worm wheel connected to the drive shaft; A worm shaft connected to a motor installed in the housing and gear connected to the worm wheel; And a friction control unit configured to press the worm shaft to adjust a friction force between the worm wheel and the worm shaft.

In addition, the worm shaft is provided with a bearing, characterized in that the mounting hole is formed in the housing so as to face the bearing.

In addition, the friction control unit, the adjustment stopper is inserted into the mounting hole; An adjustment pin slidably inserted into the adjustment stopper to pressurize the bearing; A plug installed in the mounting hole to press the control pin; And an elastic member interposed between the plug and the adjustment pin.

In addition, a step is formed in the mounting hole portion, the locking stop is formed on the adjustment stopper facing the step, characterized in that the O-ring is interposed between the step and the locking portion.

In addition, the friction control unit, characterized in that it further comprises a damper which is installed on the control pin so as to be interposed between the control pin and the bearing.

Since the vehicle steering apparatus according to the present invention can adjust the friction force between the worm shaft and the worm wheel, by adjusting the friction force between the worm shaft and the worm wheel to a target value when assembling the steering apparatus, the noise generated during steering operation is reduced and the steering performance is deteriorated. There is an advantage that can be prevented.

1 is a block diagram showing a vehicle steering apparatus according to an embodiment of the present invention.
2 is a partially enlarged view illustrating a friction control unit of a vehicle steering apparatus according to an embodiment of the present invention.
3 is an exploded cross-sectional view showing a friction control unit of a vehicle steering apparatus according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a vehicle steering apparatus according to the present invention.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator.

Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a block diagram showing a vehicle steering apparatus according to an embodiment of the present invention, Figure 2 is a partial enlarged view showing a friction control unit of the vehicle steering apparatus according to an embodiment of the present invention, Figure 3 The exploded cross-sectional view of the friction control unit of the vehicle steering apparatus according to an embodiment of the present invention.

1 to 3, a vehicle steering apparatus according to an embodiment of the present invention includes a housing 10 in which a drive shaft 50 to which a steering wheel is connected is installed, and a worm wheel 52 connected to the drive shaft 50. And the worm shaft 30 connected to the motor 32 installed in the housing 10 and gear-connected to the worm wheel 52 and the worm shaft 30 to press the worm shaft 52 to reduce the friction force between the worm wheel 52 and the worm shaft. It includes a friction control unit 70 for adjusting.

When assembling the steering device, the friction adjusting unit 70 is operated so that the friction force between the worm wheel 52 and the worm shaft 30 is included within the setting range.

If the friction force between the worm wheel 52 and the worm shaft 30 exceeds the set range, it is possible to prevent the play between the worm wheel 52 and the worm shaft 30, so that the worm wheel (when the steering operation is in progress) 52 and the vibration and noise generated between the worm shaft 30 can be reduced.

If the friction force between the worm wheel 52 and the worm shaft 30 is less than or equal to the set range, the drive shaft 50 connected to the steering wheel is easily rotated when the steering wheel returns to its original state after the steering wheel is operated, thereby restoring the steering wheel. Performance steering performance is improved.

When the frictional force between the worm wheel 52 and the worm shaft 30 falls within the set range, the vibration and noise generated between the worm wheel 52 and the worm shaft 30 are reduced, and the stability and steering performance of the steering wheel are reduced. This improved effect will be seen.

Bearings are installed in the worm shaft 30, and mounting holes 12 are formed in the housing 10 so as to face the bearings.

The worm shaft 30 is installed to be movable on the output shaft of the motor 32 and the end of the worm shaft 30 is rotatably supported by a bearing in the housing 10.

Here, since the connection structure between the worm shaft 30 and the output shaft of the motor 32 can be easily implemented by those skilled in the art, the specific configuration or description thereof will be omitted.

The friction adjusting part 70 includes an adjusting stopper 72 inserted into the mounting hole part 12, an adjusting pin 74 slidably inserted into the adjusting stopper 72 and pressing the bearing, and an adjusting pin 74. And a plug 78 installed in the mounting hole 12 to pressurize, and an elastic member 76 interposed between the plug 78 and the adjustment pin 74.

When the adjusting stopper 72 is installed in the mounting hole 12 and the adjusting pin 74 is inserted into the adjusting stopper 72, the inner end of the adjusting pin 74 presses the bearing so that the worm shaft 30 is worm wheel ( 52) to the side.

When the plug 78 is assembled to the mounting hole 12, the plug 78 presses the outer end of the adjustment pin 74 toward the inside of the mounting hole 12 so that the adjustment pin 74 presses the bearing. maintain.

At this time, since the adjusting pin 74 is supported by the elastic member 76 interposed between the adjusting pin 74 and the plug 78 to be movable, the vibration generated by the driving of the worm shaft 30 is elastic member ( It is possible to suppress the vibration transmitted by the worm shaft 30 and the bearing, which is offset by the 76, to be transmitted to the plug 78 and the housing 10.

Since a thread is formed on the circumferential surface of the plug 78 and the inner wall of the mounting hole 12, the plug 78 is measured while measuring the friction force between the worm shaft 30 and the worm wheel 52 when installing the friction adjusting unit 70. When assembled, the plug 78 can be installed in a legitimate position so that the frictional force falls within the set range.

In addition, since the jaw portion 72b is formed on the inner wall of the adjustment stopper 72 and the protrusion 74a is formed on the circumferential surface of the adjustment pin 74, the adjustment pin 74 is more than necessary. 72 can be prevented from being inserted into the inside.

In addition, the friction adjusting unit 70 further includes a damper 79 installed on the adjusting pin 74 so as to be interposed between the adjusting pin 74 and the bearing.

Since the damper 79 includes an elastic material, the damper 79 cushions the vibration transmitted to the adjusting pin 74 when the inner end of the adjusting pin 74 contacts the bearing and vibrates.

Since the hole part into which the end of the adjustment pin 74 is inserted is formed in the center of the damper 79, the inner end of the adjustment pin 74 is press-fitted into the hole part of the damper 79, and the damper 79 is installed.

A step 14 is formed in the mounting hole 12, and a locking part 72a is formed in the adjustment stopper 72 opposite to the step 14, and an O-ring is formed between the step 14 and the locking part 72a. 73).

Since the O-ring 73 is made of an elastic material, the seating portion 72a and the step 14 are inserted when the adjusting stopper 72 is inserted into the mounting hole 12 after the O-ring 73 is seated on the top surface of the step 14. O-ring (73) is interposed between the () and the installation of the engaging portion (72a) is made.

Looking at the operation of the vehicle steering apparatus according to an embodiment of the present invention configured as described above are as follows.

When the driver operates the steering wheel while driving the vehicle, the power of the steering wheel is transmitted to the drive shaft 50, the degree of rotation of the drive shaft 50 is sensed by the torque sensor, and the drive signal is controlled by the control unit by a control signal received from the torque sensor. Is sent to the motor 32.

When the motor 32 is driven by the drive signal transmitted from the controller, the worm shaft 30 is rotated so that the worm wheel 52 is rotated so that the power of the steering wheel is transmitted to the drive wheel.

At this time, the magnitude and steering performance of the noise generated between the worm shaft 30 and the worm wheel 52 are determined according to the friction force between the worm shaft 30 and the worm wheel 52, and the worm shaft 30 and the worm wheel ( The magnitude of the friction force between the 52) is determined according to the position of the plug 78 installed in the mounting hole portion 12.

When installing the plug 78 is installed while adjusting the position of the plug 78 so that the friction force is within the set range while measuring the friction force between the worm shaft 30 and the worm wheel 52.

As a result, it is possible to provide a vehicle steering apparatus which can reduce noise generated when operating the steering wheel and prevent the steering performance from being lowered.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

In addition, the vehicle steering apparatus has been described as an example, but this is merely exemplary, and the steering apparatus of the present invention may be used in other products than the vehicle.

Accordingly, the true scope of the present invention should be determined by the following claims.

10 housing 12 mounting hole
14: step 30: warm shaft
32: motor 50: drive shaft
52: worm wheel 70: friction control unit
72: adjustment stopper 72a: locking portion
72b: Chin 73: O-ring
74: adjustment pin 74a: protrusion
76: elastic member 78: plug
79: damper

Claims (5)

A housing in which a drive shaft to which a steering wheel is connected is installed;
A worm wheel connected to the drive shaft;
A worm shaft connected to a motor installed in the housing and gear connected to the worm wheel; And
And a friction control unit for adjusting the friction force between the worm wheel and the worm shaft by pressing the worm shaft.
The method of claim 1,
A bearing is installed in the worm shaft, and a vehicle steering apparatus, characterized in that a mounting hole is formed in the housing so as to face the bearing.
The method of claim 2, wherein the friction control unit,
An adjusting stopper inserted into the mounting hole;
An adjustment pin slidably inserted into the adjustment stopper to pressurize the bearing;
A plug installed in the mounting hole to press the control pin; And
Vehicle steering device comprising an elastic member interposed between the plug and the adjustment pin.
The method of claim 3,
And a stepped portion is formed in the mounting hole portion, and a locking portion is formed in the adjustment stopper facing the stepped portion, and an O-ring is interposed between the stepped portion and the locking portion.
The method according to claim 3 or 4,
The friction control unit, the vehicle steering apparatus further comprises a damper installed on the control pin so as to be interposed between the control pin and the bearing.
KR1020110057933A 2011-06-15 2011-06-15 Steering gear for vehicles KR20120138452A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110057933A KR20120138452A (en) 2011-06-15 2011-06-15 Steering gear for vehicles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110057933A KR20120138452A (en) 2011-06-15 2011-06-15 Steering gear for vehicles

Publications (1)

Publication Number Publication Date
KR20120138452A true KR20120138452A (en) 2012-12-26

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ID=47905248

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110057933A KR20120138452A (en) 2011-06-15 2011-06-15 Steering gear for vehicles

Country Status (1)

Country Link
KR (1) KR20120138452A (en)

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E902 Notification of reason for refusal
E601 Decision to refuse application