JPH0542883A - Steering device for driving wheel - Google Patents

Abstract

PURPOSE:To provide the above steering device for driving wheels which are made to be able to be furnished with tires of a small diameter that is the same as that of follower wheels. CONSTITUTION:An axle end 29 is fitted to the end portion of an axle housing 31, and a drive wheel steering knuckle 26 is turnably supported by means of a king pin 28 provided at the axle end 29 on the upper side of a uniform velocity joint 33. As a result, a drive wheel 15 can be constituted with the same tire size as a follower wheel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering system for driving wheels, and more particularly to a steering system in which a driving wheel driven by an engine is rotatably supported by a kingpin and is connected to a knuckle arm for steering. ..

[0002]

2. Description of the Related Art The structure of a front axle of a four-wheel drive truck is as shown in FIG. 2. A front axle hub 1 is rotatably supported by a straight sleeve 4 via a pair of bearings 2 and 3. There is. The base end side of the sleeve 4 is fixed to the steering knuckle 5, and the knuckle 5 is rotatably supported by the axle housing 8 by the upper and lower kingpins 6, 7. A constant velocity joint 9 is arranged between the upper and lower king bins 6 and 7 of the steering knuckle 5,
The driving force is transmitted to the front wheels attached to the hub 1 via the joint 9. Further, steering is performed by turning the steering knuckle 5 by the knuckle arm 10.

[0003]

According to the conventional steering device for a front wheel as described above, the king pins 6 and 7 are provided above and below the constant velocity joint 9, respectively, and the steering device is difficult to fit inside the disc wheel. , This has made it necessary to install large diameter tires. Therefore, generally, in a four-wheel drive truck, there is a disadvantage that the waist is higher and the vehicle posture is higher than a truck in which only the rear wheels are driven and the front wheels are driven wheels.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a steering system for driving wheels in which a tire having a small diameter similar to that of the driven wheels can be mounted. Is.

[0005]

SUMMARY OF THE INVENTION The present invention provides a device in which a driving wheel driven by an engine is rotatably supported by a kingpin and is connected to a knuckle arm to perform steering, and at the end of an axle housing. The steering knuckle of the drive wheel is rotatably supported by a king pin provided on the axle end above the constant velocity joint for transmitting the drive force, and the steering end of the drive wheel is steered. It relates to the device.

[0006]

When the knuckle arm is moved by the steering mechanism, the steering knuckle turns around the kingpin, and steering is thereby performed. And, there is no kingpin on the lower side of the constant velocity joint, so that there is no need to worry about interference between the lower kingpin and the disc wheel. Therefore, it becomes possible to mount a tire having a small diameter similar to that of the driven wheel.

[0007]

1 shows a drive wheel steering apparatus according to an embodiment of the present invention, which shows a front wheel steering apparatus of a four-wheel drive truck. Tire 15
The wheel 16 that supports the wheel is attached to the front axle hub 17. A brake disc 18 is attached to the hub 17, and the disc 18 is arranged inside the wheel 16. Then, the hub 17 is attached to the disk 18 by a pair of left and right bearings 19 and 20.
Along with it, it is rotatably supported by the straight sleeve 21. Further, the hub 17 is connected to the joint shaft 23 so that the driving force is transmitted to the hub 17.

The housings of the bearings 19 and 20 are fixed to the steering knuckle 26, and the upper end side of the knuckle 26 constitutes a support portion 27. The supporting portion 27 is fixed to the axle end 2 by the kingpin 28.
It is pivotally connected to 9. The steering knuckle 26 is connected to a steering device via a knuckle arm 30. An axle shaft 32 is inserted through the inside of the axle housing 31, and a constant velocity joint 33 is attached to the tip end side of the axle shaft 32. The constant velocity joint 33 is located below the king pin 28, and the output shaft of the speed reducer composed of a pair of gears constitutes the joint shaft 23 and is connected to the hub 17 as described above.

Accordingly, the driving force of the engine is the axle shaft 32, the constant velocity joint 33, and the joint shaft 23.
Is transmitted to the front axle hub 17 via the wheel, and the tire 15 of the wheel 16 attached to the hub 17 is driven. When the knuckle arm 30 is steered by the steering mechanism, the steering knuckle 26 turns around the kingpin 28, whereby the front wheels are steered in a predetermined direction.

In such a steering device, an axle end 29 is provided at the end of the axle housing 31, and the axle end 29 is extended above the constant velocity joint 33. At this portion, the knuckle 26 is swung by the kingpin 28. I try to support it as much as possible. Therefore, the kingpin 28 is located only above the constant velocity joint 33. Therefore, the lower kingpin does not interfere with the wheel 16 at all, and it is not necessary to provide a gap between the lower kingpin and the wheel 16. This makes it possible to reduce the size of the mechanism around the constant velocity joint 33 and the king pin 28, and it becomes possible to mount the tire 15 having the same size as the steered wheels that are the driven wheels. It is possible to establish the drive wheels with the same tire size. This makes it possible to eliminate the high vehicle posture.

[0011]

As described above, according to the present invention, an axle end is attached to an end portion of an axle housing, and a steering knuckle for driving wheels is provided by a king pin provided on the axle end above a constant velocity joint for transmitting a driving force. It is designed so as to be pivotable. Therefore, according to such a structure, it is possible to omit the king pin on the lower side of the constant velocity joint, which makes it possible to configure a mechanism around the constant velocity joint and the king pin compactly, and The tire allows the drive wheel to be constructed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a drive wheel steering apparatus according to an embodiment.

FIG. 2 is a vertical sectional view showing a conventional steering device for driving wheels.

[Explanation of symbols]

 15 Tire 16 Wheel 17 Front Axle Hub 18 Brake Drum 19, 20 Bearing 21 Straight Sleeve 23 Joint Shaft 26 Steering Knuckle 27 Support 28 King Pin 29 Axle End 30 Knuckle Arm 31 Axle Housing 32 Axle Shaft 33 Constant Velocity Joint 35 Thrust Bearing

Claims (1)

[Claims] 1. A device in which a driving wheel driven by an engine is rotatably supported by a kingpin and is connected to a knuckle arm for steering, and an axle end is attached to an end portion of an axle housing.
A steering device for a driving wheel, wherein a steering knuckle of the driving wheel is rotatably supported by a king pin provided on the axle end above a constant velocity joint that transmits the driving force.