JPS635933Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a front wheel drive system for a front engine/front wheel drive vehicle with front independent suspension and a four wheel drive vehicle.

In the conventional front wheel drive system of an automobile as described above, if the constant velocity joint of the front wheel drive shaft has a joint angle, a second moment is generated due to the drive torque, but the outboard joint of the constant velocity joint has a joint angle. Since it is on the axis, the moment of inertia acts around the kingpin axis. If the left and right joint angles are the same, the secondary moments will cancel each other out and torque steer will not occur. There will be a difference in the angle and torque steer will become an issue.

The present invention is a front wheel drive system having a differential gear device, in which the differential gear device is elastically supported on a spring, and the differential gear device is applied in the direction of reducing the difference between left and right joint angles by the drive torque reaction force of the propeller shaft. To provide a simple and convenient front wheel drive device which suppresses the occurrence of torque steer by reversing the rotational direction of a propeller shaft from normal so that a gear device is tilted.

Next, a preferred example of the front wheel drive device for an automobile according to the present invention will be explained with reference to the drawings.

Figure 1 shows the drive system of a four-wheel drive vehicle.
This device distributes drive torque to the front and rear wheels using a transfer shaft 1, and a propeller shaft 2 for the rear wheels.
The driving force is transmitted to the rear wheels and the front wheels respectively by a propeller shaft 3 for the front wheels, and the front wheels are transmitted through a differential gear device 5 and a drive shaft 6 which are elastically supported by the body 4. It is driven by As shown in FIG. 2, the differential gear device 5 has a rubber material 9 baked into it for elastic support between a bracket 7 and a spacer 8, which are integral with the differential gear device 5. 10 by bolts 11, washers 12, and nuts 13.

FIG. 3 is a diagram of the front wheel drive system shown in FIG. 1 viewed from the front of the vehicle, and the left and right drive shafts 6 have different lengths, and the joint angles of the outboard joints 14 are different on the left and right sides. ing.

As shown in FIG. 4, when driving torque acts on the front wheels and the differential gear device 5, which is elastically supported by the body 4, tilts, the left-right difference in the joint angle of the outboard joint 14 changes. .
In the conventional device, the differential gear device 5 is configured so that the differential gear device 5 is inclined in the direction in which the difference between the left and right joint angles of the outboard joint 14 for rotating the front wheel propeller shaft 3 to the right when viewed from the front of the vehicle increases. However, in the device of the present invention, the front wheel propeller shaft 3 is rotated to the left when viewed from the front of the vehicle, that is, the propeller shaft is rotated toward the shorter drive shaft.
Therefore, as shown in FIG. 4, the differential gear device 5 is attached to the bolt 8 connected to the body 4 by the rubber material 9 in a direction that reduces the difference between the left and right joints of the outboard joint 14. The vehicle tilts and torque steer is suppressed. As can be seen from the above description, according to the configuration of the present invention, the differential gear device is elastically supported on the body via the elastic member, and the propeller shaft is rotated toward the shorter drive shaft. As the propeller shaft rotates, the differential gear device is tilted toward the shorter drive shaft against the elastic member, reducing the difference between the left and right joint angles of the constant velocity joint. Steer can be corrected. Further, there is no need to change the tooth helix angle of the helical gear in the meshing portion, unlike in conventional systems where the position of the differential gear is different from that of the power unit.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an example of a front wheel drive device for an automobile according to the present invention, FIG. 2 is a sectional view of a portion of the device shown in FIG. 1, and FIGS. FIG. 3... Front wheel propeller shaft, 5... Differential gear device, 6... Drive shaft, 14... Outboard joint.

Claims (1)

[Scope of utility model registration request] It includes a propeller shaft that transmits driving force, a differential gear device that is elastically supported on the body via an elastic member, and a drive shaft that has different left and right lengths and a constant velocity joint,
rotating the propeller shaft toward the shorter drive shaft so that the differential gear device tilts toward the shorter drive shaft against the elastic member due to rotation with the propeller shaft; A front wheel drive device for an automobile, characterized in that a difference between left and right joint angles of the constant velocity joint is reduced.