KR101356859B1 - Steering Apparatus for Vehicle - Google Patents

Abstract

The present invention relates to a vehicle steering apparatus.

One embodiment of the present invention comprises a yoke connected to the steering shaft and the universal joint via a spider; A hollow outer shaft to which the inner shaft is inserted and coupled to the inner circumferential surface; And the outer side is inserted and coupled to the yoke, and the inner side is inserted and coupled to transmit the rotation of the steering shaft, and the outer shaft is inserted and coupled to the inner circumferential surface and spaced apart from each other in the circumferential direction on the outer circumferential surface to protrude in the radial direction. An inner member formed therein, and a second boss spaced apart in the circumferential direction from the first boss on the inner circumferential surface into which the inner member is inserted, protruding inward in the radial direction, and the outer member inserted into and coupled to the yoke on the outside; It provides an automobile steering apparatus comprising a; isolator comprising an elastic member coupled between the first boss and the second boss.

According to the present invention, by coupling the isolator to the connection between the steering shaft and the yoke, the outer shaft, the vibration and noise transmitted from the outside during normal driving to improve the steering feeling, when the need for steer steering is switched to the electromagnet for immediate steering It is effective to obtain responsiveness.

Automotive steering, intermediate shaft, power transmission, elastic bush

Description

Steering Apparatus for Vehicle

The present invention relates to a vehicle steering apparatus. More specifically, the isolator is coupled to the connection between the steering shaft, yoke and the outer shaft to absorb steering vibrations and noise from the outside during normal driving, improving steering, and switching to an electromagnet when sudden steering is required for immediate steering response. The present invention relates to a car steering apparatus capable of obtaining a castle.

In general, a power assisted steering device is used as a means for reducing the steering force of the steering wheel (handle) to ensure the stability of the steering state. Such a power assisted steering device includes a conventional hydraulic steering device (HPS) using hydraulic pressure. Hydraulic Power Steering System (WD) has been widely used in vehicles, but recently, unlike conventional methods that use hydraulic pressure, the motor's rotational force makes the driver's steering power easier and an environmentally friendly Electronic Power Steering System (EPS). ) Is commonly installed in vehicles.

The electric steering system (EPS) drives a motor in an electronic control unit according to the vehicle's driving conditions detected by a vehicle speed sensor, a steering angle sensor and a steering torque sensor, thereby providing a light and comfortable steering feeling at low speeds. In addition, it provides heavy steering feeling and good directional stability at high speeds, and provides optimum steering conditions to the driver by providing rapid steering in the emergency situation by providing the restoring force of the steered steering wheel according to the rotation angle of the steering wheel. do.

On the other hand, the electric steering device as described above is configured to rotate the steering shaft inside the motor is installed on the outside of the steering column disposed between the steering wheel and the gearbox to transmit the driver's steering wheel rotation force to the lower side. It assists the driver's steering power due to steering wheel steering.

When the driver rotates the steering wheel in the desired direction, the steering shaft connected to the steering wheel rotates, and the steering shaft consists of rack and pinion gear through the universal joint and the intermediate shaft. Transmit torque to the gearbox.

At this time, the gear box converts the rotational movement of the steering shaft into linear motion by the rack and pinion gear and transmits it to the rack bar. The rack bar transmits the force to the tie rod connected to the knuckle of the tire to change the direction of the vehicle. Allow change.

In particular, the shaft between the steering shaft and the gearbox has a structure in which the input shaft and the output shaft do not coincide in the same coaxial line and are inclined at a certain angle. Therefore, the steering shaft can be changed to a constant angle because the general shaft coupling method cannot transmit power. Universal joints and intermediate shafts are essential.

1A is a schematic diagram of a conventional vehicle steering apparatus, from a steering wheel 170 in which a driver manipulates steering to a steering column 150, a steering shaft 130, an intermediate shaft 100, and a gear box 180. The rotation of the steering wheel 170 is transmitted to the gearbox 180 by a series of shaft connections, thereby achieving steering of the vehicle.

In addition, a vehicle speed sensor (not shown), a steering angle sensor 155, a steering torque sensor (not shown) and the like are provided to drive the motor of the reducer in the electronic control device (not shown) according to the driving conditions of the vehicle detected therein It provides high steering stability and steering speed at low speed and high speed, and provides the driver with optimum steering conditions by providing fast steering wheel restoring force so that rapid steering can be achieved in emergency situations.

In such a vehicle steering apparatus, the lower end of the steering shaft 130 is connected to the gearbox 180, but the steering shaft 130 is connected to the gearbox 180 while being inclined at an arbitrary angle in the surrounding conditions. In order to satisfy the condition, the universal joint and the intermediate shaft 100 are used.

Here, the intermediate shaft 100 is used as a term for a member that transmits a rotational force even when the intermediate shaft 100 and the inner shaft 124 are refracted at a predetermined angle.

The intermediate shaft 100 is connected to the steering shaft 130, one side is coupled to the steering wheel 170, the other side is connected to the gear box 180 to the torque generated from the steering wheel 170 gearbox 180 It is a device that delivers to the wheel through).

The steering column 150 may include sensors such as a steering angle sensor 155 and a steering torque sensor (not shown), a reducer (not shown), an outer tube 145, an inner tube 140, and a mounting bracket 160. It is configured to include, the outer tube 145 is formed on the steering wheel 170 side is provided with an inner tube 140 that can be inserted into the inside when the impact is smaller than the outer tube 145 inside. The outer tube 145 and the inner tube 140 is formed of a hollow tube so that the steering shaft 130 can rotate smoothly.

1B is a perspective view showing a part of a vehicle steering apparatus according to the prior art.

As shown in Figure 1b, the intermediate shaft 100 according to the prior art is a rotational force transmitted from the universal joint 110 and the universal joint 110 mounted on one side for transmitting the rotational force even in a state of refraction at a predetermined angle. The outer shaft 122 and the inner shaft 124 which are transmitted to the universal joint 110 mounted on the other side and expandable in the axial direction are provided.

The intermediate shaft 100 is a shaft that is stretched by a force acting in the axial direction to transmit the rotational force of the shaft, a universal joint 110 composed of two yoke (120) and one spider 115, The inner shaft 124 is coupled to the yoke 120 through the fastening pin 125 and is inserted into the outer shaft 122 and the outer shaft 122 having a hollow shape to absorb the force in the longitudinal direction. In some cases, it may be configured to include a ball 135 or a bush (not shown) provided between the outer shaft 122 and the inner shaft 124.

The outer shaft 122 has a hollow inner shape, and the inner shaft 124 having a round bar shape is inserted into and connected to the inner shaft 122, and the inner circumferential surface of the outer shaft 122 is long in the axial direction. The outer guide groove 133 is formed so that the inner shaft 124 moves together during the slip movement that is drawn in or drawn out from the outer shaft 122, and in some cases, the ball 135 or the bush may be inserted. .

The inner shaft 124 has one side connected to the universal joint 110 and the other side coupled with the outer shaft 122 to transmit rotational force and inserted into the outer shaft 122 to slip in the axial direction while being input and output shafts. It is a member that absorbs the load in the longitudinal direction therebetween.

The outer circumferential surface of the inner shaft 124 is provided with an inner guide groove 137 formed in the longitudinal direction at a position opposite to the outer guide groove 133 of the outer shaft 122.

However, the steering apparatus of the related art according to the related art has a steering shaft formed of a steel material for rigidity, and the yoke and the outer shafts are directly connected to each other without a damping role, so that the rigidity and the steering response are good, but vibrations and noises from outside are introduced. There was a problem that is delivered directly to the driver.

In particular, in general driving that does not require a sharp change in steering angle, vibrations and noises are relatively sensitive to the driver, causing a steering discomfort to the driver.

Accordingly, the present invention has been made to solve the above problems, by coupling the isolator to the connection of the steering shaft and yoke, the outer shaft, to improve the steering feeling by absorbing vibration and noise transmitted from the outside during normal driving, steer steering If necessary, it is an object of the present invention to provide a vehicle steering apparatus that can be converted to an electromagnet to obtain immediate steering response.

One embodiment of the present invention to achieve this object is yoke connected to the steering shaft and the universal joint via a spider; A hollow outer shaft to which the inner shaft is inserted and coupled to the inner circumferential surface; And the outer side is inserted and coupled to the yoke and the inner side is the outer shaft is inserted and coupled to transmit the rotation of the steering shaft, the outer shaft is inserted and coupled to the inner circumferential surface and spaced apart from each other in the circumferential direction formed in the radial direction An inner member having a first boss formed therein, and a second boss spaced apart from the first boss in the circumferential direction and protruding inward in the radial direction are formed on the inner circumferential surface into which the inner member is inserted, and the outer side is inserted into the yoke. It provides an automobile steering apparatus comprising a; isolator including an outer member to be coupled, and an elastic member coupled between the first boss and the second boss.

According to the present invention, by coupling the isolator to the connection between the steering shaft and the yoke, the outer shaft, the vibration and noise transmitted from the outside during normal driving to improve the steering feeling, when the need for steer steering is switched to the electromagnet for immediate steering It is effective to obtain responsiveness.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

Figure 2a is an exploded perspective view showing a part of the vehicle steering apparatus according to an embodiment of the present invention, Figure 2b is a perspective view showing an isolator of the vehicle steering apparatus according to an embodiment of the present invention, Figure 2c is an embodiment of the present invention It is sectional drawing which shows a part of automobile steering apparatus by an example.

As shown in these drawings, a vehicle steering apparatus according to an embodiment of the present invention includes a yoke 120 connected to a steering shaft (see 130 of FIG. 1A) and a universal joint 110 via a spider 115; A hollow outer shaft 122 into which the inner shaft 124 is inserted and coupled to the inner circumferential surface; And the outer side is inserted and coupled to the yoke 120 and the inner side is the outer shaft 122 is inserted and coupled to transfer the rotation of the steering shaft, the outer shaft 122 is inserted and coupled to the inner circumferential surface and each other in the circumferential direction Spaced apart from the first boss 217 in the circumferential direction on the inner member 213 having the first boss 217 formed to protrude radially and the inner circumferential surface into which the inner member 213 is inserted; A second boss 215 is formed to protrude inwardly in the radial direction and an outer member 211 is inserted into and coupled to the yoke 120, and the first boss 217 and the second boss 215 are inserted into and coupled to the yoke 120. It is configured to include; isolator 210 including an elastic member 219 coupled between.

In addition, the coil 235 is inserted between the inner peripheral surface and the outer peripheral surface of the inner member 213 and wound in the circumferential direction; A power supply unit 220 coupled to an inner circumferential surface of the outer shaft 122 and connected to the coil 235; And a power source coupled to an inner circumferential surface of the outer shaft 122 and connected to the power supply unit 220 to control power supply to the coil 235 according to a steering angle value input from a steering angle sensor (see 155 of FIG. 1A). Control unit 230; may be configured to include.

The automobile steering apparatus according to the present invention can secure immediate steering response in case of steered steering such as sharp turning of a vehicle while absorbing vibration and noise flowing from the outside in the isolator of the intermediate shaft which transmits the rotation of the steering shaft to the rack bar. There is a characteristic.

The vehicle steering system rotates the steering shaft connected to the steering wheel (see 130 in FIG. 1A) when the driver operates the steering wheel (see 170 in FIG. 1A), which transmits torque to the gearbox through the universal joint and the intermediate shaft. In this case, the intermediate shaft has a structure in which the inner shaft 124 and the outer shaft 122 are expanded and contracted so that the intermediate shaft can be expanded and contracted in the axial direction at the same time.

The outer shaft 122 has a hollow tube shape, one side of the outer shaft 122 is coupled to the inner shaft 124 having the inner guide groove 137 is inserted through the ball 135, the expansion and rotation of the steering shaft An outer guide groove 133 is formed on the inner circumferential surface in a serration direction in the inner circumferential surface so as to transmit a motion, and the other side is coupled to the yoke 120.

The yoke 120 is bent at a predetermined angle with the steering shaft, and one side is coupled to the outer shaft 122, and the other side is coupled to the steering shaft and the universal joint via the spider 115.

On the other hand, the hollow outer shaft 122 is inserted into the isolator 210 is inserted into the inner peripheral surface of the yoke 120 is coupled.

The isolator 210 is inserted and coupled to the yoke 120 on the outside and the outside is inserted and coupled to the outer shaft 122 to absorb the vibration and noise transmitted from the outside while transmitting the rotation of the steering shaft, the inner member 213 And an outer member 211 and an elastic member 219.

The inner member 213 has an outer shaft 122 inserted into and coupled to the inner circumferential surface thereof, and a first boss 217 formed to protrude in the radial direction and spaced apart from each other in the circumferential direction is formed, and the outer member 211 has an inner side. A second boss 215 spaced apart from the first boss 217 in the circumferential direction and protruding inward in the radial direction is formed on the inner circumferential surface into which the member 213 is inserted.

The inner member 213 and the outer member 211 are inserted into and coupled to each other, and an elastic member 219 is disposed between the first boss 217 of the inner member 213 and the second boss 215 of the outer member 211. Is coupled to absorb vibrations and noise from the outside during steering of the vehicle.

Here, the elastic member 219 is a natural rubber (NR), Nitrile Butadiene Rubber (NBR), Chloroprene Rubber (CR), Ethylene Propylene Terpolymer (EPDM), Fluoro Elastomer (FPM), Styrene Butadine (SBR), Chlorosulphonated Polyethylene ), Made of a material having weatherability and elasticity, such as silicon, and acts as a damping role.

However, when the driver manipulates the steering wheel, the steering shaft rotates while the steering shaft rotates while the outer member 211 and the inner member 213 rotate together with the yoke 120 while compressing the elastic member 219 in the rotating direction. In this case, since the elastic member 219 that absorbs vibration and noise introduced from the outside is elastically deformed in the rotational direction of the outer member 211, steering response becomes low.

Accordingly, a power supply unit coupled to the inner circumferential surface of the outer shaft 122 and the coil 235 inserted between the inner circumferential surface and the outer circumferential surface of the inner member 213 and wound in the circumferential direction so as to prevent this from happening. 220 is coupled to the inner circumferential surface of the outer shaft 122 and connected to the power supply 220 to control the power supply to the coil 235 according to the steering angle value input from the steering angle sensor (see 155 of FIG. 1A). The power control unit 230 is further configured.

The power supply unit 220 is connected to the coil 235 as a type of charger and is pressed into the inner circumferential surface of the outer shaft 122 and coupled thereto.

The power controller 230 is press-coupled to the inner circumferential surface of the outer shaft 122 and receives a signal through a can angle communication with a steering angle sensor measuring the rotation angle of the steering shaft, and the power supply unit 220 supplies power to the coil 235. In this case, the can communication is a communication method generally used in automobiles and the following detailed description will be omitted.

The coil 235 inserted and wound between the inner circumferential surface and the outer circumferential surface of the inner member 213 when the steering shaft rotates above a specific angle according to the steering angle value input from the steering angle sensor in this way, that is, when a sudden steering is performed. By supplying a current to the inner member 213 is converted to an electromagnet to rotate integrally with the outer member 211 to increase the steering response.

In addition, the power supply controller 230 applies power supply to the coil 235 according to the steering angle value at which the steering shaft input from the steering angle sensor rotates. If the steering angle value input from the steering angle sensor is greater than or equal to 10 °, the power is supplied to the coil 235, and if the steering angle value input from the steering angle sensor is less than 10 °, power is supplied to the coil 235. Control to block.

According to the present invention having such a structure and shape, by coupling the isolator to the connecting portion of the steering shaft, yoke, and the outer shaft, it absorbs vibration and noise transmitted from the outside during normal driving to improve the steering feeling and requires steered steering. In this case, it is converted to an electromagnet, which has an effect of obtaining immediate steering response.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1A is a schematic diagram of a conventional vehicle steering apparatus;

1B is a perspective view showing a part of a vehicle steering apparatus according to the prior art;

Figure 2a is an exploded perspective view showing a part of the vehicle steering apparatus according to an embodiment of the present invention;

2B is a perspective view of an isolator of a vehicle steering apparatus according to an embodiment of the present invention;

Figure 2c is a cross-sectional view showing a part of a vehicle steering apparatus according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110: universal joint 115: spider

120: yoke 122: outer shaft

210: isolator 211: outer member

213: inner member 215: second boss

217: first boss 219: elastic member

220: power supply unit 230: power control unit

235: coil

Claims (3)

Yoke connected to the steering shaft and the universal joint via a spider; A hollow outer shaft to which the inner shaft is inserted and coupled to the inner circumferential surface; The outer side is inserted and coupled to the yoke and the inner side is the outer shaft is inserted and coupled to transmit the rotation of the steering shaft, the outer shaft is inserted and coupled to the inner circumferential surface and spaced apart from each other in the circumferential direction on the outer peripheral surface is formed protruding An inner member having one boss formed therein, and a second boss spaced apart in the circumferential direction from the first boss and protruding inward in the radial direction are formed on the inner circumferential surface into which the inner member is inserted, and the outer side is inserted into the yoke. An isolator including an outer member which is formed and an elastic member coupled between the first boss and the second boss; A coil inserted between an inner circumferential surface and an outer circumferential surface of the inner member and wound in a circumferential direction; A power supply unit coupled to an inner circumferential surface of the outer shaft and connected to the coil; And A power control unit coupled to an inner circumferential surface of the outer shaft and connected to the power supply unit to control power supply to the coil according to a steering angle value input from a steering angle sensor; Car steering apparatus, characterized in that comprises a. delete The method of claim 1, The power control unit controls to supply power to the coil when the steering angle value input from the steering angle sensor is greater than or equal to 10 ° and to cut off the supply of power to the coil when the steering angle value input from the steering angle sensor is less than 10 °. Car steering apparatus, characterized in that.

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