KR100223524B1 - Pneumatic steering system for vehicle steering systems - Google Patents

Abstract

The present invention relates to a pneumatic auxiliary steering device of a vehicle steering device, and to extend the steering gear device and the steering gear device (2) and at the same time, with the technical task of obtaining an auxiliary steering force at the time of steering using air pressure. A rack bar 4 having a plurality of through holes formed along the outer circumferential surface at a predetermined position of the hollow cylinder at a predetermined position in the hollow cylinder, a cylinder 6 connected to the steering gear device in a horizontal direction, and a predetermined gap with the outer circumferential surface of the rack bar. And a disc-shaped piston member 8 having a recessed portion formed on the inner side of the space, and being integrally circularly fixed to the outer circumference of the rack bar to receive the back pressure of the left and right flows at the recessed portion of the piston member so that the rack bar can move left and right. The disk-shaped valve body 5, the ballistic member 12, the pneumatic generating means 14, and the electronic control means 16 for controlling the movement of the rack bar by pneumatic pressure Thereby providing a pneumatic auxiliary steering system of a car steering system.

Description

Pneumatic auxiliary steering device of automobile steering system

The present invention relates to a pneumatic auxiliary steering device of a vehicle steering device, and more specifically, in a steering gear device consisting of a rack gear that interlocks with a conventional pinion gear, the rack bar and the cylinder and the piston structure can be operated pneumatically, the rack bar moves at the moment of the rack bar. The present invention relates to a pneumatic auxiliary steering device for a vehicle steering device for assisting with pneumatic pressure by generating a left and right movement force by air pressure, that is, an auxiliary steering force, on a cylinder and a piston member installed on an extension line of a vehicle.

As is well known, the power assist steering device of a vehicle includes a steering wheel, a steering shaft connected thereto, a column tube axially bearing the shaft, a universal joint connected to the steering shaft to transmit a torsional torque, and a rotation force transmitted based on a torsion bar. A hydraulic control valve for opening and closing the hydraulic pressure by rotating a predetermined angle, an oil pump for supplying oil to the hydraulic control valve, a reaction force piston for assisting steering by detecting the speed of the steering device to shut off the hydraulic pressure, and A pinion gear shaft connected to a hydraulic control valve to transmit a torsional rotational force, a hydraulic cylinder supplied with hydraulic pressure transmitted from the hydraulic control valve, and connected to the pinion gear shaft to control left and right steering force by the hydraulic cylinder. It consists of rack bars that receive the hydraulic power of the steering wheel while driving the vehicle. A secondary steering system is a hydraulic secondary steering ever.

However, this hydraulic auxiliary steering system adopts a pinion valve for hydraulic control, and the structure for performing oil supply and control for controlling it is complicated, especially in a small vehicle (small manual rack pinion steering system). Rotational forces are reluctant to adopt oil-based auxiliary steering.

Therefore, it is possible to omit a structure such as an oil control valve by not using oil as a working medium, thereby simplifying the structure, and an auxiliary steering device which is advantageous in fuel economy and cost is required.

The present invention has been made in an effort to provide a pneumatic power assist steering device, which is simplified and overcomes the disadvantages of the conventional steering aid using oil.

1 is a schematic overall view of the bottom of the steering apparatus according to the present invention;

2 is a cross-sectional view taken along the line A-A of FIG.

Figure 3a is a perspective view of a part of the rack bar applied to the present invention

3B is a perspective view of a valve body applied to the present invention

Figure 3c is a partial cutaway perspective view of the piston member applied to the present invention

Figure 4a is a functional diagram when steering the left side of the present invention

Figure 4b is a functional diagram when steering the present invention right

Explanation of symbols on the main parts of the drawings

2: steering device, 4: rack bar, 5: valve body, 6: cylinder, 8: piston member, 12: elastic member,

14: pneumatic generating means, 16: electronic control means, 42: passage, 44: through hole, 52: partial pressure hole,

54: public hall, 82: through-hole, 84: space part, 86: indentation part.

The present invention provides a steering gear device to achieve this object; A rack bar extending from the steering gear device and at the same time forming a hollow cylinder and having several through holes formed along the outer circumferential surface at a predetermined position of the hollow cylinder; A cylinder connected to the steering gear device in a horizontal direction and configured to pass the rack bar through a center portion of an enclosed space; A disk-shaped piston member having a through-route formed so that the rack-bar is welded to the center while maintaining a predetermined gap with the outer circumferential surface of the rack bar, and formed into a space portion in connection with the through-route. ; The pressure-reducing unit integrally attached to the outer circumference of the rack bar radially forms a partial pressure path communicating with the through hole of the rack bar, and communicates with the partial pressure path at the recess of the piston member central space to receive the back pressure of the left and right flows according to the pneumatic pressure. A disk-shaped valve body positioned in the space portion of the piston member so as to be movable left and right; A ballistic member interposed between the valve body and the space portion of the piston member to elastically move the valve body oppositely according to the distribution direction of pneumatic pressure; Pneumatic generating means for supplying air pressure in the rack bar and the cylinder; It provides a pneumatic auxiliary steering device of a vehicle steering device to assist the steering of the movement of the rack bar by pneumatic including an electronic control means for controlling the pneumatic generating means to remove the pneumatic at a constant speed and generate a sliding resistance at a constant speed do.

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

1 is a schematic view of the entire apparatus for carrying out the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, FIG. 3A is a cutaway view of a main part of the piston member of the present invention, and FIG. to be.

According to this figure, the pneumatic auxiliary steering device according to the present invention receives a steering force largely transmitted from a steering wheel and converts the steering force into a horizontal movement force and a horizontal movement force transmitted from the steering gear device. A rack bar 4 to be moved, a cylinder 6 in which the rack bar 4 is located on the center portion, a piston member 8 for controlling the left and right movement force in the middle of the cylinder, and the piston member 8 A valve body 5 for controlling the high pressure air to the left and right while being located in the inner space 84 of the engine, an elastic member 12 interposed between the valve body 5 and the piston member 8, and the cylinder ( And pneumatic generating means 14 for supplying air pressure to 6) and electronic control means 16 for controlling the pneumatic pressure of the pneumatic generating means 14.

Specifically, the steering gear device 2 converts the steering rotational force transmitted from the steering wheel to the left and right movement force through the pinion gear and the rack gear.

The rack bar 4 extends from the steering gear device 2 and at the same time forms a hollow cylinder or a passage 42 through which air of constant pressure flows, and along the outer circumferential surface of the hollow cylinder at a predetermined position, 44 are formed arranged in the circumferential direction.

The cylinder 6 is connected to the steering gear device 2 in the horizontal direction and the rack bar 4 is piped so as to pass through the center of the sealed space.

The piston member (8) forms a through passage (82) such that the rack bar (4) is welded to the center while maintaining a predetermined gap with the outer circumferential surface of the rack bar (4), and connected to the through passage (82) into a space therein. The part 84 is formed, and it becomes disk shape which provided the recessed part 86 in the inner surface of this space part 84. As shown in FIG.

That is, the piston member (8) forms an outer circumferential surface that is hermetically slidably closed on the hollow disc-shaped cylinder inner surface, and forms an inner wall formed in a circular direction corresponding to the left and right to maintain a predetermined gap with the outer circumferential surface of the inner rack bar in connection with the outer circumferential surface Then, the space portion 84 is formed between the inner walls, and the concave portion 86 formed around the inner surface of the space portion 84 is formed.

The valve body 5 forms a tube 54 through which the rack bar 4 penetrates at a central portion thereof to be integrally attached to the outer circumference of the rack bar 4 and communicates with the through hole 44 of the rack bar 4. The pressure dividing hole 52 is formed radially to communicate with the pressure dividing hole 52 in the recessed portion 86 of the central space 84 of the piston member 8 to receive the back pressure of the left and right flows according to the pneumatic pressure. (4) is positioned in the space portion 84 of the piston member 8 so as to be movable left and right.

The shot member 12 is interposed between the valve body 10 and the space portion 84 of the piston member 8 to elastically move the valve body 5 in the opposite direction in the distribution direction of the pneumatic pressure.

The pneumatic generator 14 is composed of a kind of air pumping means for supplying air pressure into the rack bar 4 and the cylinder 6, the pneumatic generator 14 is a high speed in accordance with the vehicle speed while driving It operates in conjunction with the electronic control means 16 for controlling the air pumping pressure while controlling to generate the sliding resistance by removing the pneumatic pressure.

In the assembly process of the present invention, the donut-shaped valve body 5 is first placed in the inner space 84 of the piston member 8, and then each of the carburetor members is disposed in the remaining space 84 before and after. 12) is impressed so that the piston member 8 is impressed at regular intervals on the front and rear surfaces of the valve body 5.

Subsequently, the through hole 44 of the rack bar 4 and the valve on the through passage 54 of the valve body 5 in the state of assembling the assembled valve body 5, the piston member 8, and the elastic member 12. The valve body 5 is fixed to the rack bar 4 with the circlip 3 etc. in the state which the partial pressure hole 52 of the sieve 5 matched.

The cylinder assembly of the auxiliary steering apparatus according to the pneumatic pressure of the present invention is completed by attaching the rack bar 4 to the cylinder 6 together with the piston member 8 which is movable on the fixed valve element 5.

Hereinafter, the auxiliary steering operation of the present invention will be described.

That is, Figure 4a is a cross-sectional view showing the control operation when steering the left side of the present invention, Figure 4b is a cross-sectional view showing the control operation during the right steering when the first left steering, the rotational force transmitted from the pinion gear is changed to a horizontal linear movement force rack bar (4) is moved to the right, and the high pressure air is supplied from the partial pressure hole 52 of the valve body 5 to the concave portion 86 of the piston member 8 at the beginning of the right movement and then to the left of the valve body 5. The high pressure is supplied to the space portion 84 at the moment of communication with the space portion 84 to form the back pressure of the high pressure air into the chamber on the right side of the cylinder 6, so that the piston member 8 is pushed to the left side and the piston member 8 The valve body 5 in the inner side is moved together to the left to obtain assistance of the left steering to achieve left steering.

In addition, in the case of right steering, as shown in FIG. 4B, the electronic control means 16 is turned on at the moment the initial rack bar 4 starts to move left by physical steering force, and thus the pneumatic generating means 14 is turned on. Air of a predetermined pressure is supplied to the passage 42 of the rack bar 4 through the piston member in the partial pressure hole 52 of the valve body 5 communicated with the high pressure air through the several through holes 44. Since high-pressure air is supplied to the concave part 86 of (8), the left side movement 84 of the valve body 5 communicates with the concave part 86 so that the high-pressure air flows into the left chamber of the cylinder. By the back pressure, the piston member 8 receives the force to move to the right, and the piston member 8 is moved to the right, and the space portion 84 of the dynamic pressure where the high pressure air of the same pressure is continuously supplied also has the same area. While moving the rack bar (4) The beuche 5 is moved right.

In addition, the present invention also detects the high-speed driving situation as a speed sensor to block the supply of high-pressure air when reaching a certain speed to rely on the degree of rotation of the pure pinion gear to assist the steering by the sliding resistance in a state of insensitive steering Steering will be done.

As described above, the present invention allows the high pressure air to act as a back pressure at the left and right sides of the cylinder during the initial steering of the rack bar, so that the auxiliary steering is performed by the pneumatic pressure at the same time as the initial steering, thereby achieving a steering operation almost the same as the auxiliary steering of the conventional hydraulic control method. .

Therefore, the left and right auxiliary steering is made while properly controlling the high pressure air, thereby avoiding the complexity of the hydraulic control structure by forming a complicated flow path of the conventional hydraulic control method.

Claims (1)

Steering gear units; A rack bar extending from the steering gear device and at the same time forming a hollow cylinder and having several through holes formed along the outer circumferential surface at a predetermined position of the hollow cylinder; A cylinder connected to the steering gear device in a horizontal direction and configured to pass the rack bar through a center portion of an enclosed space; A disk-shaped piston member having a through-route formed so that the rack-bar is welded to the center while maintaining a predetermined gap with the outer circumferential surface of the rack bar, and formed into a space portion in connection with the through-route. ; The pressure-reducing unit integrally attached to the outer circumference of the rack bar radially forms a partial pressure path communicating with the through hole of the rack bar, and communicates with the partial pressure path at the recess of the piston member central space to receive the back pressure of the left and right flows according to the pneumatic pressure. A disk-shaped valve body positioned in the space portion of the piston member so as to be movable left and right; A ballistic member interposed between the valve body and the space portion of the piston member to elastically move the valve body oppositely according to the distribution direction of pneumatic pressure; Pneumatic generating means for supplying air pressure in the rack bar and the cylinder; Electronic control means for controlling the air pressure generating means to remove air pressure and generate sliding resistance at a constant speed by adjusting the air pressure; Pneumatic auxiliary steering device of the vehicle steering device to assist the steering of the movement of the rack bar by pneumatic.