KR19990040241A - Speed Sensitive Steering Handle Control Force - Google Patents

Abstract

The present invention relates to a speed-sensitive steering wheel steering force control device, by sensing the traveling speed of the vehicle and lifting the yoke supporting the rack gear according to the traveling speed to the motor to adjust the depth of engagement with the pinion gear appropriately. In addition, the purpose of the steering wheel can be easily adjusted according to the vehicle speed, as well as the structure is simple and inexpensive.

In order to achieve the above object, the pinion gear (1) connected via the steering shaft to be rotated in the same direction as the steering wheel is engaged with the rack gear (3) inserted into the steering gear box and supported to be movable left and right. And support means (4, 5, 6, 7, and 8) for elastically supporting the rack gear, and applying a control signal to the support means in accordance with the vehicle speed to lift and lower the rack gear through the support means. A controller (ECU) is installed to control the steering force of the steering wheel by adjusting the depth of engagement with the gear.

Description

Speed Sensitive Steering Handle Control Force

The present invention relates to a steering device of a vehicle, and in particular, by adjusting the depth of engagement of the pinion gear and the rack gear built in the steering gear box is mounted to the lower end of the steering shaft to transmit the rotational movement of the steering wheel according to the driving speed of the vehicle The present invention relates to a speed sensitive steering wheel steering force control device configured to control a steering wheel steering force of a driver according to a vehicle speed.

In general, the steering device of a vehicle is a device that is mounted so that the driver can arbitrarily change the direction of travel of the wheel, and a steering mechanism, steering shaft, column, and the like, for the driver to directly steer and transmit the operating force to each mechanism. To reduce the rotation of the steering shaft, increase the operating force, change the direction of movement of the control mechanism, and transmit the movement of the gear mechanism to the front wheel, and maintain the relative position of the left and right wheels at the same time. It has a link mechanism consisting of Pitman arm and drag link and knuckle arm and tie rod.

Here, the gear mechanism is composed of a pinion gear mounted to the lower end of the steering shaft and a rack gear that is engaged with the pinion gear so as to be movable to the left and right of the steering gear box, that is, as shown in FIG. A pinion gear 102 connected to a steering wheel via a steering shaft is inserted into the steering shaft 101, and the rack gear 103 meshed with the pinion gear 102 is accommodated in the steering gear box 101 so as to be movable left and right. It is.

That is, the lower portion of the rack gear 103 is formed in a hemispherical shape, and the yoke 104 is coupled to the hemispherical shape via a bush, and the yoke 104 is elastically connected via the spring 105. On the other hand, the spring 105 is mounted on the upper surface of the adjustment bolt 106 screwed to the steering gear box to be supported.

Accordingly, the rack gear 103 is elastically supported by the yoke 104 and the spring 105 to be installed to be moved left and right in the steering gear box, while the driver manipulates the steering wheel. The manipulation force is transmitted to the pinion gear through the steering shaft, and the pinion gear is rotated. The rotation of the pinion gear causes the rack gear to be moved left or right corresponding to the rotation direction of the steering wheel, and steering is performed.

In this case, the force applied when the driver operates the steering wheel depends on the engagement state and the depth of engagement of the pinion gear and the rack gear, that is, when the pinion gear and the rack gear are deeply engaged with each other, the steering wheel is rotated. On the other hand, when the pinion gear and the rack gear are shallowly engaged, the handle operation is lighter.

The rack gear is supported by the spring and the yoke so that the force applied when operating the handle as described above, i.e., when the adjustment bolt is rotated in one direction to deeply engage the steering gear box, the spring The compression of the rack gear pushes up the rack gear upwards, thereby increasing the depth of engagement between the rack gear and the pinion gear, while rotating the adjustment bolt in the opposite direction, the rack gear descends while being supported by the spring. The depth of engagement with the gear becomes relatively shallow.

However, as described above, the depth of engagement between the rack gear and the pinion gear cannot be adjusted while the driver stops the vehicle. Therefore, when the depth of the gear between the rack gear and the pinion gear becomes shallow, the steering force of the handle becomes light but While driving stability deteriorates during driving, when the depth of engagement between the rack and the pinion gear becomes deeper, the driving stability is improved at high speeds, but the operation response of the steering wheel is slow and the steering cannot be performed quickly at the time of medium and low speed driving.

In order to alleviate the above drawbacks, a so-called speed-sensitive power steering device has been conventionally proposed to vary the operating force of the steering wheel according to the vehicle speed. The power steering device includes a hydraulic chamber formed in a steering gear box and the hydraulic chamber. Hydraulic oil supply device for supplying the hydraulic oil to the control unit, and a control device for sensing the vehicle speed and controlling the hydraulic oil supplied to the steering gear box through the hydraulic oil supply device, when the vehicle is a high speed hydraulically hinder the movement of the rack gear This makes the steering wheel's operating force heavier, while the vehicle is made at low and medium speeds by hydraulic pressure to make the steering wheel lighter.

However, the conventional speed-sensitive power steering device as described above requires a hydraulic pump and a control valve, and thus, there are various disadvantages such as a complicated structure, a high cost, and a low durability of the device.

Accordingly, the present invention has been made to solve the above-mentioned drawback, by sensing the traveling speed of the vehicle by lifting the yoke supporting the rack gear according to the traveling speed to the motor to properly adjust the depth of engagement with the pinion gear It is an object of the present invention to provide a speed-sensitive steering wheel steering force control device that can easily adjust the steering force of the steering wheel according to the vehicle speed and can be configured at a low cost due to its simple structure.

1 is a side view showing a support state of a rack gear meshed with a pinion gear mounted on a steering shaft according to the prior art;

2 is a schematic configuration diagram of a speed-sensitive steering wheel steering force control device according to the present invention.

<Description of Symbols for Main Parts of Drawings>

1-Pinion Gear 2-Steering Gear Box

3-rack gear 4-yoke

5-spring 6-sheet

7-support 8-step motor

9-vehicle speed sensor 10-rotation displacement sensor

The present invention for achieving the above object, the pinion gear connected via the steering shaft to be rotated in the same direction as the steering wheel is engaged with the rack gear is inserted into the steering gear box to be movable to the left and right, A support means for elastically supporting the rack gear is provided, and a control signal is applied to the support means according to the vehicle speed to raise and lower the rack gear through the support means to adjust the depth of engagement with the pinion gear to control the steering force of the steering wheel. Controller to control is installed.

According to a preferred embodiment of the present invention, the support means is a yoke coupled to the lower portion of the rack gear, a spring for resiliently supporting the yoke, a sheet on which the spring is seated, and a step-Mo Equipped with a screw-type support mounted on the output shaft of the rotor, the control means is equipped with a vehicle speed sensor and a rotation displacement sensor for detecting the rotational displacement of the support, and compares the vehicle speed and the rotational displacement of the support according to a pre-program The control signal is adapted to discriminate and to correspond to each other.

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

Figure 2 is a schematic configuration diagram of a speed-sensitive steering wheel steering force control device according to the present invention, that is, the pinion gear (1) is connected to the steering wheel via a steering shaft to rotate in the same direction as the steering wheel steering wheel box (2) is inserted into and engaged with the rack gear (3), the rack gear (3) is seated in the yoke (4) is supported by the yoke (4) so as to be movable left or right.

Here, the lower surface of the yoke (4) is formed with a receiving groove at a predetermined depth, and the spring (5) is inserted into the receiving groove to support the yoke (4) elastically, the lower end of the spring (5) While the seat 6 is seated on the sheet 6, a screw-type support 7 is mounted on the lower surface of the sheet 6, while the support is rotatably mounted to the output shaft of the step motor 8.

In addition, a controller (ECU) is connected to the motor (8) to supply driving control power to the motor (8), and an input terminal of the controller (8) and a vehicle speed sensor (9) for detecting a vehicle speed and Rotational displacement detection sensors 10 for detecting rotational displacement are respectively connected.

Accordingly, the vehicle speed is sensed by the sensor 9 and input to the controller while the vehicle is running, and the controller detects the vehicle speed based on the input signal and supports the rotation displacement sensor 10 via the support ( The rotation amount of 7) is detected.

The controller receives the speed signal of the vehicle and the rotation displacement signal of the support and compares and discriminates the signals with a predetermined program, that is, compares whether or not the support is rotated according to the determined vehicle speed. If the support is not rotated at a pre-programmed angle corresponding to the vehicle speed, a control signal is applied to the motor to rotate the support via the motor.

In other words, when the vehicle speed is high, the support is increased by rotating the motor to increase the depth of engagement between the pinion gear and the rack gear, whereas the depth of engagement between the pinion gear and the rack gear is relatively high when the vehicle is medium or low speed. The support is lowered by rotating the motor to be shallow.

As described above, when the rack gear is raised by the support and the depth of engagement with the pinion gear is deepened at the high speed at the speed of the vehicle, the driver has a lot of effort to operate the steering wheel, while the vehicle speed is medium or low speed. If the rack gear is lowered by the support and the depth of engagement with the pinion gear is shallow, the driver will have less effort to operate the steering wheel.

That is, the steering force of the steering wheel can be proportionally adjusted according to the vehicle speed. This means that if the controller controls the driving time of the step motor, the step motor is rotated at a predetermined angle by an applied control signal, thereby raising or lowering the support. It is possible to easily control the steering force of the steering wheel in proportion to the vehicle speed.

The structure as described above is composed of only two sensors and step motors, etc., compared to the conventional hydraulic device, and the structure is extremely simple and can be configured at low cost, and the durability and reliability of the device are also improved.

As described above, according to the speed-sensitive steering wheel steering force control device according to the present invention, the structure is simple and inexpensive, and it is not only easy to configure, but also excellent in durability, and controls the steering wheel steering force very easily in proportion to the vehicle speed. Therefore, when the vehicle speed is high speed, the driving stability is achieved, and when the vehicle is medium or low speed, the steering is achieved quickly.

Claims (3)

A pinion gear inserted into the steering gear box so as to be rotated in the same direction as the steering wheel by a steering shaft connected to the steering wheel, and a rack gear meshed with the pinion gear and supported to be moved left and right by the pinion gear. Supporting means for elastically supporting the rack gear, and a controller for controlling the operating force of the steering wheel by applying a control signal to the support means in accordance with the vehicle speed to raise the rack gear via the support means to adjust the depth of engagement with the pinion gear Speed-sensitive steering wheel operating force control system. The step motor according to claim 1, wherein the support means includes a yoke coupled to a lower portion of the rack gear, a spring for resiliently supporting the yoke, a sheet on which the spring is seated, and an integrally coupled to the sheet. Speed sensitive steering wheel steering force control device, characterized in that it has a screw support mounted to the output shaft. According to claim 1, wherein the control means is equipped with a vehicle displacement sensor and a rotational displacement sensor for detecting the rotational displacement of the support, and compares and determines the rotational displacement of the vehicle speed and the support according to a previously input program to correspond to each other A speed sensitive steering wheel operating force control device, characterized in that to apply a control signal to the motor.