JPS6218309A - Toe-angle controller for rear wheel of car - Google Patents

Abstract

PURPOSE:To obtain the superior traveling performance over the whole speed range by providing a rear-wheel suspension means equipped with a driving mechanism for varying the toe angle of the rear wheel and operation-controlling the driving mechanism according to the car speed data. CONSTITUTION:A rear wheel suspension means 1 in dual link strat system is equipped with front and rear arms 3 and 4 in pairs, and the basic edge of the front arm 3 is supported onto a body-side bracket 6, and the rear arm 4 is arranged in slidable ways. The rear arm 4 is connected to a screw cylinder 8 through a ball joint 7, and said screw cylinder 8 is screwed with the screw part 10 in the mutual reverse screw form at the both edges of a driving shaft 9. Said driving shaft 9 is revolved through a deceleration gear train 11 by the operation of a control motor 12, and said control motor 12 is controlled by a controller 15 so that the toe angle theta of the rear wheel 2 becomes zero, when the car speed detected by a car speed sensor 16 is a prescribed value (e.g., 60km/h) or less, and the toe angle theta increases on the toe-in side when the car speed is over the prescribed value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a toe angle control device for a rear wheel in an automobile.

. (Prior art) In order to maintain running stability when a car turns,
A prior art technique in which the rear wheel talker automatically changes when turning is disclosed in Japanese Utility Model Application Publication No. 59-87305.

(Problems to be solved by the invention) The driving performance of an automobile is to have excellent driving stability;
Excellent maneuverability. Although this is important, it is difficult to achieve both at the same time.

Therefore, looking at the relationship between vehicle speed, running stability, and maneuverability, it would be advantageous to design a vehicle that emphasizes running stability when driving at high speeds, and maneuverability when driving at medium to low speeds.

Rear wheel talker control, which greatly affects the driving performance of a car, should be done from a similar perspective. The above-mentioned prior art mentions rear wheel toe angle control for the driving condition of turning, but does not mention the rear wheel toe angle control for the speed of the vehicle.

In view of the above, the present invention provides a rear wheel toe angle control device that maintains favorable driving performance over the entire speed range by placing emphasis on driving stability during high-speed driving and on maneuverability during medium-low speed driving. The purpose is to provide.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a rear wheel suspension means equipped with a drive mechanism that changes the toe angle of the rear wheels, a vehicle speed sensor that measures vehicle speed, and a vehicle speed sensor. The present invention provides a rear wheel toe angle control device for an automobile, which includes a controller that operates the drive mechanism according to vehicle speed data from the vehicle and sets the rear wheel toe angle to a predetermined value.

(Function) Data is stored in the memory of the controller to set the toe angle of the rear wheels to be large towards the inside during high speed driving, and to set the toe angle to be small towards the inside during medium to low speed driving (zero or set to the outside). ) If the data is given, the controller will control the vehicle according to the vehicle speed data of the vehicle speed sensor.
When the drive mechanism is activated, the toe angle of the rear wheels can be set large toward the inside during high-speed driving, ensuring driving stability, while the toe angle can be set small toward the inside during medium-low speed driving, improving maneuverability. It can be in excellent condition.

(Embodiment) The embodiment of the present invention shown in FIGS. 1 and 2 relates to a device for controlling the talker θ of a rear wheel 2 supported by a dual link-strut type rear wheel suspension means l.

The rear wheel suspension means 1 arranged on the left and right sides of the rear part of the vehicle body.
each includes a pair of front and rear arms 3.4, and a rear arm 4.
is arranged so that it can slide. When the rear arm 4 moves in the direction of the arrow in FIG. 1, the wheel support 5 rotates and the talker θ of the rear wheel 2 increases inward. The front arm 3 has its base end supported by a body-side bracket 6, and the rear arm 4 is connected to a threaded cylinder 8 via a ball bolt 7.
This threaded cylinder 8 is screwed into a threaded portion 10 of a drive shaft 9.

The left and right threaded parts 10 located at both ends of the drive shaft 9 are formed so that one has a right-hand thread and the other has a left-hand thread, so that, like a turnbuckle, the rotation of the drive shaft 9 in the force direction is
The left and right threaded barrels 8 move in the directions of the arrows, respectively, and when the drive shaft 9 rotates in the other direction, the left and right threaded barrels 8 move in the opposite direction to the arrowed directions. The drive shaft 9 is also connected to a control motor 12 via a reduction gear train 11.

As shown in E, in this embodiment, the control motor 12, reduction gear train 11, drive shaft 9, threaded tube 8, rear arm 4, etc. constitute a drive mechanism 17 that changes the talker θ of the rear wheel 2. However, it goes without saying that the mode of this drive mechanism 17 is not limited to the above. In addition, in Figure 1, 13
Reference numeral 14 is a case that houses the control motor 12 and the reduction gear train 11. Reference numeral 16 is a vehicle speed sensor that measures the vehicle speed of the automobile. It is preferable to use a vehicle speed sensor 16 that directly measures the vehicle speed by magnetically or optically detecting the rotation of the speedometer cable, but indirectly by detecting the engine speed and shift position. It is also possible to use something that measures vehicle speed.

A controller 15 operates the drive mechanism 17 in accordance with vehicle speed data from the vehicle speed sensor 16, and sets the talker θ of the rear wheel 2 to a predetermined value. As shown in FIG. 2, the controller 15 stores the set value of the talker θ corresponding to the vehicle speed as control data, and is provided with a program for executing this. Therefore, in the case shown in FIG. 2, when the vehicle speed is less than 60 + m/h, the talker θ of the rear wheel 2 is 0, and when the vehicle speed exceeds 80 Ks/h, the talker θ is 0 as the vehicle speed increases. increases quadratically on the inside.

As a result, during high-speed driving, the talker θ of the rear wheels is set largely toward the inside, resulting in good running stability. On the other hand,
During medium-low speed operation of 60 km/h or less, the talker θ is set to 0, so maneuverability is excellent and agile handling operations can be performed.

The control data stored in the storage section of the controller 15 is
It is possible to set the optimum value depending on the vehicle type, driving conditions, etc., and it is also possible to configure the setting so that it can be easily changed.

(Effects of the Invention) Since the present invention has the configuration described above, it is possible to optimally control the toe angle of the rear wheels according to the vehicle speed, and to maintain running stability and maneuverability in a good state in relation to the vehicle speed. It has the effect of being able to maintain

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a graph showing the relationship between the vehicle speed controlled by the controller and the toe angle of the rear wheels.

Claims (1)

[Claims] (1) Rear wheel suspension means equipped with a drive mechanism that changes the toe angle of the rear wheels, a vehicle speed sensor that measures the vehicle speed, and a vehicle speed sensor that operates the drive mechanism in accordance with vehicle speed data from the vehicle speed sensor to adjust the toe angle of the rear wheels. A toe angle control device for a rear wheel in an automobile, comprising a controller that sets the angle to a predetermined value.