KR20040015557A - shimmy and shake reducing device for steering device - Google Patents

Abstract

PURPOSE: A vibration reducing device of a steering system is provided to cut off a transfer path of vibration delivered through a steering shaft by automatically cutting off the steering shaft up and down by hydraulic pressure of oil of a power steering collected into an oil reservoir and accordingly to remove unpleasantness and uneasiness of a driver and secure operation stability. CONSTITUTION: A vibration reducing device of a steering system is composed of a clutch part(3) mounted to the upside of divided steering shafts(1,2); a slider(5) formed to surface-contact to the clutch part and connected to the lower part of the divided steering shaft by a spline; a fluid tank(7) fixed to a vehicle body to cover the clutch part and the slider; a spring(8) elastically supporting the slider to the clutch part; a stopper(9) installed to prevent the slider from rotating in the fluid tank within a predetermined range; an oil passage(11) disposed to feed oil between the clutch part and the slider in the neutral of the steering shaft; and an oil discharge outlet(13) installed to the fluid tank to discharge oil fed to the oil passage.

Description

Vibration reduction device of steering device {shimmy and shake reducing device for steering device}

The present invention relates to a steering apparatus of a vehicle, and more particularly, to preventing various vibrations transmitted on a steering shaft of a steering apparatus from being transmitted to a steering wheel.

1 shows a conventional general power steering device, when the driver's steering wheel 100 manipulation is transmitted to the steering shaft 102, the oil pump 104 according to the difference between the resistance from the wheel and the driver's manipulation force. By operating the power cylinder 106 by the hydraulic pressure provided by the to generate the auxiliary steering force to assist the steering force of the driver.

That is, as shown in FIG. 2, when oil is supplied from the oil pump 104 to the control valve 108 in which the opening and closing state of each port is switched by the difference between the resistance from the wheel and the driver's operating force, the control valve 108 Appropriate hydraulic pressure is supplied to the power cylinder 106 according to the open / closed state of the port to assist the driver's steering force, and oil for forming the hydraulic pressure is recovered from the control valve 108 to the oil reservoir 110 and then again. The oil pump 104 is to be circulated to the control valve 108.

Of course, when the driver is not steering, the oil from the oil pump 104 is recovered from the control valve 108 back to the oil reservoir 110 so as not to generate the auxiliary steering force.

On the other hand, the vibration (shimmy & shake) generated during the driving of the vehicle is mainly generated by the vibration of the transmission, drive shaft, wheels, tires, etc. is transmitted to the steering wheel 100 has a problem that gives the driver discomfort and anxiety, The transmission path of the vibration has a path from tie rods-> gearbox-> universal joint-> steering column and steering shaft-> steering wheel.

The present invention has been devised to reduce the vibration transmitted to the steering wheel as described above, it is possible to automatically disconnect the transmission path of the vibration transmitted through the steering shaft, thereby relieving the discomfort and anxiety of the driver and adjustment stability The purpose is to provide a vibration reducing device of the steering device to ensure that.

1 is a block diagram showing a general power steering apparatus,

2 is an explanatory diagram for explaining an operation mechanism of the power steering apparatus of FIG.

3 is a main configuration diagram of a vibration reducing device of a steering apparatus according to the present invention;

4 is a view for explaining the operation of the vibration reducing device of FIG.

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

One; Upper steering shaft 2; Lower steering shaft

3; Clutch portion 5; Slider

7; Fluid box 8; spring

9; Stopper 11; Oil passage

13; Oil outlet

Vibration reduction device of the steering apparatus of the present invention for achieving the above object is a clutch portion provided on the upper side of the divided steering shaft;

A slider formed in surface contact with the clutch and connected to the lower side of the divided steering shaft by a spline;

A fluid tank surrounding the clutch unit and the slider and fixed to the vehicle body;

A spring for holding the slider toward the clutch portion;

A stopper provided to prevent the slider from rotating in the fluid tank within a predetermined range;

An oil passage provided so that oil is supplied between the clutch portion and the slider when the steering shaft is neutral;

It characterized in that the oil discharge port provided in the fluid tank so that the oil supplied to the oil passage can be discharged.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 3 is a structural diagram showing a vibration reducing device of the steering apparatus according to the present invention, the steering shaft is divided up and down, and the vibration reduction device is configured therebetween, the upper steering of the divided steering shaft (1, 2) A clutch portion 3 provided on the lower side of the shaft 1, a slider 5 formed in surface contact with the clutch portion 3 and connected to the lower steering shaft 2 by a spline, and the clutch portion 3. And a fluid tank (7) surrounding the slider (5) and fixed to the vehicle body, a spring (8) for holding the slider (5) toward the clutch portion (3), and the slider (5) within a predetermined range. Stopper 9 provided to prevent the engine from rotating in the fluid tank 7 and an oil passage provided so that oil is supplied between the clutch portion 3 and the slider 5 when the steering shaft 1 is neutral. 11 and the oil supplied to the oil passage 11 can be discharged. It consists of an oil outlet 13 provided in the fluid tank (7).

Of course, the above configuration is not necessarily bisecting and installing the steering shaft, but also bisecting and installing a universal joint connecting the lower end of the steering shaft and the gearbox.

Here, the fluid tank (7) is formed so as to form a space in which the divided steering shaft (1, 2) is rotatably inserted in each of the upper and lower sides, the pressure oil can be supplied therebetween, the oil passage (11) ) Is formed inside the clutch portion 3 from the fluid tank 7 to supply oil recovered from the oil pump to the oil reservoir through the control valve when the upper steering shaft 1 is neutral. The oil outlet 13 of the fluid tank 7 is connected to the oil reservoir.

The clutch portion 3 and the slider 5 are formed to be in a conical shape in order to increase the contact surface between each other and to be self-aligning, and the slider 5 is within the predetermined range of the fluid tank 7. The stopper 9 provided to prevent rotation in the cylinder enables the slider 5 to rotate in the fluid tank 7 and the slider 5 when the slider 5 is in close contact with the clutch portion 3. When is released from the clutch portion 3 is provided within the range to prevent the rotation.

3 is a state in which steering is performed, in which the steering shaft 1 is rotated so that no oil is supplied to the oil passage 11 of the clutch unit 3, in which case the slider 5 is In close contact with the clutch unit 3 by the elastic force of the spring 8, the steering operation force of the driver is transmitted to the lower steering shaft 2 as it is through the clutch unit 3 and the slider 5 as it is desired steering And, of course, in this case, by the control valve and the power cylinder is provided an auxiliary steering power to assist the driver's steering power.

In this state, since the slider 5 is free from the stopper 9, there is no problem in the driver's steering force being transmitted to the lower steering shaft 2.

4 is a state in which steering is not performed, and since the steering shaft 1 is in a neutral state, the oil passage 11 is supplied with oil recovered from the oil pump to the oil reservoir via a control valve.

Therefore, since the oil overcomes the force of the spring 8 and lowers the slider 5, the upper steering shaft 1 and the lower steering shaft 2 are connected to the clutch part 3 and the slider 3. Disconnected by oil). Therefore, the various vibrations transmitted to the lower steering shaft 2 are cut off almost without being transmitted to the upper steering shaft 1, so that the driver holding the steering wheel connected thereto can feel quietness and stability.

At this time, the slider 5 is in a state in which the rotation in the fluid box 7 is suppressed by the stopper 9 so that the steering wheel and the tire are separated, but serve to stably support the tire not to rotate. Done.

According to the present invention as described above, by using the hydraulic pressure of the power steering oil recovered by the oil reservoir to realize a state in which the steering shaft is automatically disconnected up and down, blocking the transmission path of vibration transmitted through the steering shaft. In order to solve the discomfort and anxiety of the driver, it is possible to secure coordination stability.

Claims (1)

A clutch unit provided at an upper side of the bisected steering shaft; A slider formed in surface contact with the clutch part and connected to the lower side of the divided steering shaft by a spline; A fluid tank surrounding the clutch unit and the slider and fixed to the vehicle body; A spring for holding the slider toward the clutch portion; A stopper provided to prevent the slider from rotating in the fluid tank within a predetermined range; An oil passage provided so that oil is supplied between the clutch portion and the slider when the steering shaft is neutral; An oil outlet provided in the fluid tank so that the oil supplied to the oil passage is discharged; Vibration reduction device of the steering device, characterized in that consisting of.