JPS5981265A - Steering gear for vehicle - Google Patents

Abstract

PURPOSE:To allow effective arrangement without limitation in a vertical space at the lower area of the rear portion of a vehicular body, by supporting to a vertical shaft an arm connected to a rotary member interlocked with a steering wheel, and also connected to a tie rod for rear wheels. CONSTITUTION:Operation of a steering handle 1 is transmitted through a linkage shaft 24 to a rotary member 31, which serves to rotate a crank arm 33. The crank arm 33 is connected through a connecting rod 51 to an arm 41, which is supported to a vertical shaft. The arm 41 is connected to a tie rod 13 for rear wheels, which are steered by the rotation of the tie rod. As the arm 41 is vertically supported, effective arrangement may be obtained without limitation in a vertical space at the lower area of the rear portion of a vehicular body.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a vehicle steering system that steers front wheels and rear wheels by steering operation of a steering wheel.

The rotation required for rear wheel steering is taken out from the front wheel steering system via a linkage member as rotation of a rotating member, which is loosely fitted and supported by an eccentric pin provided on the rotating member, and connects and supports the left and right rear wheel steering tie rods. A vehicle that steers the front wheels and rear wheels simultaneously so that the front and rear wheels are steered in proportion to the steering angle by the horizontal and vertical rocking caused by crank rotation of the eccentric pin of the joint member. Steering device (patent application 1986-9)
No. 8894, etc.) was previously provided by the present applicant.

According to such a steering device, it is possible to steer the rear wheels in the same direction as the front wheels by operating a small steering angle of the steered wheels, and it is also possible to steer the rear wheels in the opposite direction by operating a large steering angle. In addition to improving maneuverability, the steering angle can be increased to obtain a small turning radius when making U-turns or maneuvering people in parking lots, etc.
The maneuverability of the vehicle is improved.

However, the joint member that connects and supports the left and right rear wheel steering tie rods is loosely fitted and supported by the eccentric pin, and is located at the center of the lower rear part of the vehicle body, so that the joint member moves with the crank movement of the eccentric pin. Since it swings left and right and up and down, it is inevitably subject to space constraints in the vertical direction, especially in the rear lower part of the vehicle body.

The present invention allows the inner ends of the left and right rear wheel steering tie rods to horizontally swing only left and right without swinging up and down, thereby eliminating the constraints of vertical space at the rear lower part of the vehicle body.
This was done for the purpose of arranging a rear wheel steering system advantageously in terms of space.

In order to achieve such an object, the present invention connects and supports left and right rear wheel steering tie rods to an arm member pivoted on a vertical axis so as to be horizontally swingable, and also connects and supports tie rods for steering left and right rear wheels to a rotating member that rotates in conjunction with the steered wheels. The gist is that the provided eccentric bottle and the arm member are connected by a connecting rod.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a schematic configuration of a four-wheeled vehicle equipped with a steering device according to the present invention, and the second is a plan view of the same.
FIG. 3 is an enlarged perspective view of the main parts.

The tip of the handle shaft 2 of the handle 1, which is a steered wheel, is incorporated into a rack-and-pinion type front wheel steering gear box 20 via a universal joint, etc., and as is known, the end of the handle shaft 2 of the handle 1 is assembled into a rack-and-pinion type front wheel steering gear box 20. A driven pinion (both not shown in the diagram) is engaged with the left half of the rack that engages with the drive pinion at the tip, and the gear box 20
Tie rods 3, 3 are connected to both ends of a rack shaft 21 that protrudes from the left and right sides, respectively. Knuckle arms 4, 4 are connected to the outer ends of the tie rods 3, 3, and the front wheels 6,
Reference numeral 6 denotes an axle 5.6 projecting outward from the knuckle arms 4,4.
It is supported by 5.

The front wheels are steered by operating the handlebar 1. In other words, the rotation of the handlebar shaft 2 causes the rack shaft 21 to move left and right relative to the gear box 20 through the engagement of the pinion and rack, which causes both tie rods 3. 3 turns to the left □ right, and the knuckle arm 4°4 rotates in the left and right direction, and the 1 front wheel 6
, 6 are steered.

On the other hand, the rear part of the pinion shaft 22 of the driven pinion that meshes with the left half of the rack of the countershaft 21 is led out rearward from the gear box 20, and connected to a long linkage shaft 24 via a universal joint 23. An input shaft 31 is connected to the rear end of the shaft 24 via a universal joint 25.

The input shaft 31 is a rotating member that is disposed on the left side of the rear of the vehicle body and is supported by a bearing bracket 32. An eccentric pin 34 is attached to the rear surface of a crank arm 33 that is fixedly integrated with the rear end.
is installed protrudingly.

The arm member 41 is arranged so as to be parallel to the input shaft 31 and coincide with the left-right center line C of the vehicle body at a neutral position for steering the rear wheels. .

Arm member 41. are pivoted on a vertical shaft 42 at the front and are thus horizontally swingable, and have ball joints 43 . on the rear upper surface of the arm member 41 , respectively.・Connects and supports the left and right rear wheel steering tie rods 13.13 via the pin 43, and also connects the pin 44 hanging down from the rear lower surface of the arm member 41 and the input shaft 3.
The connecting rod 51 connects the eccentric bin 34 provided in 1 through each ball joint ±35.45. In this case, the eccentric pin 34 is initially set to be located vertically above the input shaft 31 in the neutral position.

A rear wheel 16.16 is supported on an axle 15.15 that projects outwardly from knuckle arms 14, 14 connected to the outer ends of tie rods 13.13.

Further, the vertical shaft 42 is fixedly supported by a bracket 46 on the vehicle body side.
It is fixedly installed.

When the steering wheel 1 is operated, the rack shaft 21 of the gear box 20 for steering the front wheels moves left and right, and the driven pinion shaft 21, which engages with the left half of the rack shaft 21 and rotates left and right, is connected to the rack shaft 21 necessary for steering the rear wheels. The rotation is output, and the rotation is input to the input shaft 3.1 of the rear wheel steering system via the linkage shaft 24,
The input shaft 31 rotates either left or right.

By the way, for example, if the driven pinion shaft 22 is related to the rack shaft 21 of the front wheel steering gear box 20 from below, or if it is related from above and an idle gear is interposed between the two 21 and 22, the input shaft 31 can be used as a steering wheel. Rotation is performed in the opposite direction to axis 2.

The crank arm 33 is attached to the rear end by the rotation of the input shaft 31.
As the eccentric pin 34 rotates, the connecting rod 51 connected to the eccentric pin 34 protrudes through the vertical axis 42J.
Let it swing horizontally from side to side. - By horizontally swinging the arm member 41 to the left and right around the vertical axis 42, the left and right rear wheel steering tie rods 13 and 13 connected and supported by the arm member 41 are moved left and right, and the following (rear wheel 16 .16 is steered using a predetermined steering angle function.

That is, first, during one rotation from the neutral position of the eccentric pin 34, the rear part of the arm member 41 horizontally swings in the intended direction at a gradually decreasing speed via the connecting rod 51, and thus the outer end of the tie rod 13. The rear wheels 16, 16 supported by the connected knuckle arms 14, 14 are steered in the same direction as the front wheels.

Next, from one rotation to seven rotations of the eccentric pin 34, the rear part of the arm member 41 horizontally swings at a speed that gradually increases in the opposite direction to the above, and the rear wheels are still steered in the same direction as the front wheels. . Furthermore, from one rotation to one rotation of the eccentric pin 34, the arm member 4
1 continues to swing in the opposite direction at a gradually decreasing speed, and the rear wheels are thus steered in the opposite direction to the front wheels.

As described above, the arm member 41 is pivotally supported on the vertical shaft 42 so that it can only swing horizontally.

Therefore, there is no restriction of vertical space in the lower rear part of the vehicle body.

As is clear from the above description, according to the present invention, the arm member that connects and supports the left and right rear wheel steering tie rods is pivotally supported on a vertical axis, and the eccentricity provided on the rotating member that rotates in conjunction with the steered wheels is provided. Since the pin and the above-mentioned arm member are connected by a connecting rod, the inner ends of the left and right rear wheel-rotating marine tie rods can be horizontally swung only to the left and right without swinging up and down. The rear wheel steering system can be advantageously disposed in terms of space without being constrained by the vertical space at the bottom.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view showing a schematic configuration of a four-wheeled vehicle equipped with a steering device according to the present invention, FIG. 2 is a plan view of the same, and FIG. is an enlarged perspective view of the same main part. In the drawings, 1 is a steering wheel, 6 is a front wheel, 13 is a tie rod for rear wheel steering, 16 is a rear wheel, 31 is a rotating member, 34 is an eccentric pin, 41 is an arm member, and 42 is the 8- Patent applicant Honda Motor Co., Ltd. Industrial Co., Ltd.

Claims (1)

[Claims] In a vehicle steering system in which the rear wheels are steered along with the front wheels by the steering operation of the steered wheels, the steering system is connected via a connecting rod to an eccentric pin provided on a rotating member that rotates in conjunction with the steered wheels. A vehicle steering device characterized in that an arm member that connects and supports a rear wheel steering tie rod is pivoted on a vertical axis so as to be horizontally swingable.