CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Korean Patent Application No. 10-2019-0391384, filed in the Korean Intellectual Property Office on Jul. 29, 2019, which application is hereby incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a structure for mounting a drive device and a steering device on a vehicle body of a vehicle.

BACKGROUND

A motor/speed reducer, which is a drive device for an electric vehicle in the related art, is mounted on and supported by a vehicle body through a subframe, and a gear box of a steering device is also mounted on and supported by the subframe.

That is, the subframe is fastened to a lower portion of a front vehicle body, one end of a mounting bracket is coupled to the subframe by welding, a connecting bracket is fastened to the motor/speed reducer, and the connecting bracket is fastened to the other end of the mounting bracket, such that the motor/speed reducer is mounted on the subframe through the connecting bracket and the mounting bracket.

In addition, the gear box of the steering device is fastened to and supported by an upper portion of the subframe.

However, in the case of the above-mentioned structure for mounting the drive device and the steering device on the vehicle body of the vehicle in the related art, it is difficult to share the subframe with a vehicle using an internal combustion engine, and a separate bracket needs to be added to the subframe to mount the motor/speed reducer assembly, which causes a problem with an increase in number of working processes, weight, and cost.

In addition, the above-mentioned structure cannot be applied to various types of gear boxes in common because of the arrangement structure of the gear box of the steering device, a roll mount of the motor/speed reducer assembly, and the motor/speed reducer. When a size of the motor is increased to improve a motor output, a size of the speed reducer is also increased. For this reason, a gap between the motor/speed reducer assembly and the subframe becomes insufficient. If the motor/speed reducer assembly is moved and disposed toward a front side of the vehicle in order to solve the insufficient gap, a size of the vehicle body is increased, which causes a problem with a decrease in degree of design freedom of the vehicle and an increase in weight and cost.

The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

SUMMARY

The present invention relates to a structure for mounting a drive device and a steering device on a vehicle body of a vehicle. Particular embodiments relate to a structure for mounting a drive device and a steering device on a vehicle body of a vehicle, the structure being configured to mount a motor/speed reducer assembly and a gear box of a steering device, as drive devices for an electric vehicle, on a subframe that constitutes a front vehicle body.

Embodiments of the present invention can provide a structure for mounting a drive device and a steering device on a vehicle body of a vehicle, the structure being capable of being used to apply various types of steering devices, to mount a motor/speed reducer assembly of the steering device without mounting a separate bracket on a subframe, and to apply, in common, a subframe to be mounted on an internal combustion engine.

An exemplary embodiment of the present invention provides a structure for mounting a driving device and a steering device on a vehicle body of a vehicle, in which a gear box of a steering device is mounted on a subframe, and a motor/speed reducer assembly is fastened to and supported by the gear box by means of a roll mount and a mounting bracket coupled to the roll mount.

The gear box may be a rack-driven gear box including a rack driving motor.

The motor/speed reducer assembly may be an assembly of a driving motor configured to operate a vehicle wheel, and a speed reducer configured to reduce an output speed of the driving motor, and based on the subframe, the speed reducer may be disposed to be closer to the subframe than the motor is to the subframe.

The roll mount may include a bushing and a bushing bracket configured to surround the bushing.

The bushing bracket may include two first and second bracket arms extending radially based on the bushing and spaced apart from each other.

The first bracket arm may be fastened to one side of the gear box by means of a fastening bolt, and the second bracket arm and the other side of the gear box may be fastened to the subframe by means of a mounting bolt.

The gear box may include a fastening boss provided at one side thereof so as to be fastened to the first bracket arm, and a fastening arm extending in the form of an arm so as to be fastened to the second bracket arm at the other side thereof.

The mounting bracket may include two fastening arms extending while forming an acute angle with respect to a fastening unit fastened to a center of the bushing, and the two fastening arms may be fastened to a casing of the speed reducer.

The center of the bushing may be disposed on the same line as a center (rack center) of the gear box.

The center of the bushing may be disposed around 15 mm forward or rearward from the center of the gear box.

A fastening arm fastened to the subframe may be provided in the gear box, the first bracket arm may be fastened to one side of the gear box by means of a fastening bolt, and the second bracket arm may be fastened to a lateral side of the fastening arm of the gear box.

