JPS6341792B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steering system for a front wheel drive vehicle.

In front-wheel drive vehicles, the drive system pulls the vehicle from the front, which provides good lateral stability, and the drive force acts in the steering direction, making the force action more effective. However, the structure of the front vehicle has become complicated, and conventional steering systems for front-wheel drive vehicles use drag links, worms,
The direction of travel is changed by changing the sector, pinion rack, etc. Therefore, if the vehicle suddenly changes direction while driving at high speed, the vehicle is likely to overturn, which is extremely dangerous.

Furthermore, one wheel tends to slip and spin on rainy roads, snowy roads, muddy roads, etc., and if a wheel runs into a snowy road, muddy road, etc., steering becomes impossible.

In a front wheel drive vehicle, this invention changes the direction of travel of the vehicle by increasing or decreasing the number of revolutions of the left and right front wheels, rather than by changing the traveling direction of the left and right front wheels. To provide a steering device that can be safely and easily steered even on a road surface.

Embodiments of the invention will be described with reference to the drawings. Drive spur gears 2, 2 are fixed to a propeller shaft 1 provided on the lower side of the chassis, and propulsion force from an engine (not shown) is transmitted to various devices described below. Spur gears 3, 3 rotatably provided on front wheel drive shafts 12, 12 divided into left and right parts corresponding to a propeller shaft 1 are meshed with drive spur gears 2, 2.

Bevel gears 4, 4 fixed to the insides of the spur gears 3, 3, respectively, are provided at both ends of branch shafts 6, 6, which are provided by penetrating at right angles near the left and right divisions of the front wheel drive shafts 12, 12. 5, 5, and bevel gears 7, 7 rotatably provided on the front wheel drive shafts 12, 12 corresponding to the bevel gears 4, 4 are meshed with the bevel gears 5, 5,
The bevel gears 7, 7 and one distributed bevel gear 8, 8 are meshed symmetrically with the distribution bevel gear 9 at the lower end of the steering handle shaft 10 located between these distributed bevel gears,
A handle 11 is fixed to the upper end of the steering handle shaft.

Both ends of the front wheel drive shaft 12 are connected to front wheel axles 14, 14 via universal joints 13, 13, and front wheels 15, 15 are fixed to the front wheel axles.

Front wheel shaft arms 16, 16 are provided in the housings of the front wheel shafts 14, 14, respectively, and these arms are connected to hinges 17, 17.
It is connected to tie rod 18 via.

The driving force from the engine is transmitted through the propeller shaft 1 and the spur gears 2, 2 to the spur gears 3, 3 that mesh with these gears, and the bevel gears 4, 4 that are integrated with the spur gears 3, 3 also rotate together. Bevel gears 5, 5 meshing with bevel gears 4, 4 revolve while rolling on the tooth surfaces of bevel gears 7, 7, and rotate these bevel gears 7, 7 and one distributed bevel gear 8, 8. However, these distributed bevel gears 8, 8
The distribution bevel gear 9, which is symmetrically held and meshed therebetween, does not rotate the bevel gear 9 because the rotations of the distributed bevel gears 8, 8 cancel each other out.

At the same time, the front wheel drive shafts 12, 12 rotate together with the branch shafts 6, 6 provided passing through them, rotate the front wheels 15, 15 at both ends of the front wheel drive shafts, and drive the vehicle. In this case, when the spur gears 3 and 4 rotate, the front wheel drive shaft 12 and the front wheels 15 and 15 rotate at a speed reduced to 1/2.

Front wheels 15, 15 on both ends of the front wheel drive shafts 12, 12
In order to change the running direction of the vehicle by creating a difference in rotational speed, when the driver rotates the steering wheel 11 in the changing direction, the distribution bevel gear 9 at the lower end of the steering wheel shaft 10 is rotated, and the distribution bevel gear 9 and The meshing left and right distributed bevel gears 8, 8 rotate in opposite directions, and the bevel gears 7, 7 integral with these bevel gears also rotate in the same manner.

Left and right revolving bevel gears 5 meshing with the bevel gears 7, 7;
5 also rotate in opposite directions, and when one of these left and right revolving bevel gears 5, 5 rotates in the normal direction and the other rotates in the reverse direction, the bevel gear 5 that rotates in the normal direction rotates in the opposite direction, and the bevel gear 4 receives the transmitted force.
and the bevel gear 7 operated by the driver,
The one that does not idle on the branch shaft 6 but rotates together with the branch shaft 6 to double the amount of rotation of the front wheel drive shaft 12, while the one that reverses the rotation, receives rotational force from the bevel gear 4 and meshes with the bevel gear. Since the gear 7 is rotated in the direction of the driver, the bevel gear 5 idles on the branch shaft 6 and does not rotate the front wheel drive shaft 12 fixed to the branch shaft 6.

In this way, the driver rotates the distribution bevel gear 9, distributes the rotation amount to the left and right front wheel drive shafts 12, 12, subtracts it from one drive shaft, adds it to the other, and securely distributes the amount of rotation to the left and right front wheel drive shafts. Causes a rotational difference.

When the handle 11 is rotated, the left and right front wheels 15,
15, causing a rotational difference. If the amount of rotation on the right side is large, the front wheel shaft 15 on the right side will turn forward around the universal joint 13 as shown in Fig. 1, and both the front wheel shaft 14 and the front wheel 15 on the left side will turn backward around the universal joint 13 as the axis. rotate. The left and right front wheel axles 14, 14 each turn in the same direction, but they turn separately, so in order to turn them together, the left and right front wheels 15, 15 are rotated by the Atkerman method using a tie rod 18 that connects the front wheel axle arms 16, 16. Even if there is a difference in rotation, each wheel naturally rotates in the direction of travel.

This steering system is an improvement on the conventional Atsukerman system, and is capable of correctly and easily guiding traction in the direction of turning, and reliably and easily steering the vehicle.

Furthermore, by applying the required amount of rotation to the front wheels 15, 15 using this steering device, the vehicle body will turn in the desired direction.
This system reliably traction guides the vehicle even on poor road conditions or when driving at high speeds.

As mentioned above, in the front wheel drive vehicle according to the device of the present invention, the left and right front wheels 15, 15 are operated as necessary on a muddy road, a snowy road, an icy road, or even when driving at high speed.
Provides a reliable rotational range and enables safe driving.

In a conventional steering system, the wheels change the angle with respect to the vehicle body, and the vehicle continues to travel while maintaining that angle, so the vehicle continues to travel in a radius. Therefore, it was impossible to drive straight unless the steering wheel was turned back.

On the other hand, with this steering device, the structure allows the vehicle to move straight in the same direction as a bicycle, so there is no need to return the handlebars, and the angle of the wheels relative to the vehicle body is not fixed to the vehicle body when the steering device is operated. The vehicle body follows the direction. Therefore, there is no need to return the handle.

However, when traveling in an arc on the circumference, it is necessary to continuously turn the steering wheel, but when the steering wheel stops turning, the vehicle shifts to straight-line driving.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of a steering system for a front-wheel drive vehicle according to the present invention, and FIG. 1 is a partially longitudinal sectional front view of the main part thereof, and FIG. 2 is a front view thereof. 1... Propeller shaft; 2... Drive spur gear; 3...
Driven spur gear; 4...Bevel gear; 5...Revolving bevel gear;
6...Branch shaft; 7...Bevel gear; 8...Distributed bevel gear; 9...Distribution bevel gear; 10...Steering handle shaft.

Claims (1)

[Scope of Claims] 1. A pair of driving spur gears 2, 2 are provided below the handle shaft 10, close to the dividing point of the front wheel drive shaft 12, and provided parallel thereto, and spaced apart from each other by a certain distance around the handle shaft. A propeller shaft 1 is fixed to the propeller shaft 1, which is integrated with bevel gears 4, 4 rotatably fitted to the divided front wheel drive shaft, and is also rotatably fitted to the front wheel drive shaft; spur gears 3, 3 meshed with the gears; revolving bevel gears 5, 5 provided at both ends of a branch shaft 6 provided perpendicularly to the front wheel drive shaft and meshed with the bevel gear; bevel gears 7, 7 that are rotatably fitted to the shaft, have bevel gears 8, 8 to be distributed integrally fixed to the inside, and are meshed with the revolving bevel gear; provided below the handle shaft, on both sides; a distribution bevel gear 9 meshed with the distributed bevel gear; a universal joint 13 at each end of the front wheel drive shaft; and a front wheel shaft 1;
A front wheel 15 is provided via the front wheel 15; one end of the front wheel shaft arm 16 is fixed to each universal joint, and the other end of the front wheel shaft arm 16 is connected by a tie rod 18, and by the rotation of the distribution bevel gear, the left and right divided front wheel drive shafts are connected. A steering system for a front wheel drive vehicle, characterized in that the amount of rotation is distributed to the left and right front drive wheels by subtracting the amount of rotation from one drive shaft and adding it to the other to create a rotation difference between the left and right front drive wheels.