Transfer case combination device for short-wheelbase time-sharing all-wheel drive vehicle

Abstract

The invention relates to a transfer case system for short-wheelbase time-sharing all-wheel-drive of an automobile, in particular to a transfer case compound device of a short-wheelbase time-sharing all-wheel-drive automobile. The transfer case compound device is structurally characterized by comprising a front auxiliary speed changer; the front end face of a shell of a speed changer assembly and a shell of the front auxiliary speed changer are positioned through the same bearing and fixedly connected; the rear end face of the shell of the speed changer assembly and a shell of a transfer case assembly are fixedly connected; coaxial transmission is achieved through the front auxiliary speed changer, the speed changer assembly and the transfer case assembly which are fixedly connected together; and a downward included angle which is 3 degrees is formed between the coaxial axis and the extending direction of an automobile rear axle, and the coaxial axis and an engine of the automobile are located on the same axis. The transfer case compound device has the advantages that the included angle between the axis of a rear-drive transmission shaft and the axis of the transfer case compound device is effectively decreased, friction losses are reduced, alternating load generated by torsional vibration of a transmission shaft is reduced, the transmission operation environment of a transfer case is optimized, the service life of all the components even the finished automobile is prolonged, and the transmission efficiency is improved.

Description

technical field [0001] The invention relates to a transfer case system for short-wheelbase time-sharing full-drive automobiles, in particular to a transfer case combination device for short-wheelbase time-sharing full-drive automobiles. Background technique [0002] Off-road vehicles generally have a front engine, and a transfer case is installed behind the transmission to transmit power to all wheels, forming all-wheel drive. The all-wheel drive can make the gravity of the whole vehicle be used as an adhesion force, so as to improve its adaptability, passability and safety to various road surfaces and grounds. The two-axle off-road vehicle adopts 4×4 driving form, which can be divided into full-time four-wheel drive vehicles and part-time four-wheel drive vehicles. Full-time four-wheel drive vehicles can only choose four-wheel drive. When four-wheel drive is not needed, this method is obviously uneconomical; and off-road vehicles adopt time-sharing four-wheel drive, which ...

AI Technical Summary

Problems solved by technology

[0004] There are following deficiencies in the above-mentioned transfer case combination device: because the speed changer and the transfer case are all at the same level because they are installed on the elastic suspension, at this moment the transfer drive shaft, the drive input shaft and the rear drive drive shaft are common. The shaft drive is located at the upper part of the transfer case, so the height difference between the rear axle drive output end and the rear axle input end of the transfer case is large

[0005] 1. It will cause torsional vibration of the rear drive drive shaft and the transmission components connected to it, thereby generating additional alternating loads, affecting the life of the components, and causing the vehicle to be prone to failure during operation

[0006] 2. Since the elastic suspension will vibrate with the driving of the car, the relative position of the drive input shaft and the output shaft of the transfer case (rear drive drive shaft) will change constantly. There is relative motion, which leads to friction loss and reduces transmission efficiency. The larger the angle of intersection, the lower the efficiency

[0007] 3. It cannot be applied to the short wheelbase all-wheel drive form

In order to meet the driving requirements of different off-road conditions and improve its adaptability and passability to various roads and grounds, it is necessary to adopt 6×4, 6×6 or 8×8 drive forms, and the wheelbase is shortened, which is affected by the front and rear of the vehicle. Due to space constraints, the angle between the transfer drive shaft and the rear drive drive shaft is too large to be arranged

The engine and frame remain unchanged. In order to achieve a large traction demand, an auxiliary box needs to be added. The space of the whole vehicle is not enough to arrange

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