Inter-axle torque global active allocation in-time four-drive system

Abstract

The invention discloses an inter-axle torque global active allocation in-time four-drive system. The inter-axle torque global active allocation in-time four-drive system comprises a power input shaft,a front axle, a rear axle, a first planetary gear train, a second planetary gear train, a third planetary gear train, a TV control motor, an input chain wheel and an output chain wheel. The first planetary gear train comprises a first sun gear, a first planet wheel, a first planet carrier and a first ring gear, and a hollow shaft hollowly sleeving the rear axle is arranged on the first ring gear.The second planetary gear train comprises a second sun gear, a second planet wheel, a second planet carrier and a second ring gear. The third planetary gear train comprises a third sun gear, a thirdplanet wheel, a third planet carrier and a third ring gear. The TV control motor is provided with a hollow output shaft hollowly sleeving the rear axle, and the hollow output shaft is connected with the third ring gear through a reducing mechanism. The input chain wheel is fixedly connected with the power input shaft. The output chain wheel and the input chain wheel achieve power transmission through a transmission chain therebetwwen, and the output chain wheel is fixedly connected with the front axle. The inter-axle torque global active allocation in-time four-drive system can realize the function of arbitrary distribution of torque between the front and rear axles.

Description

technical field [0001] The invention belongs to the technical field of drive systems of four-wheel drive vehicles, and in particular relates to a four-wheel drive system with full-range active distribution of inter-axle torque. Background technique [0002] In recent years, with the improvement of people's living standards and the continuous advancement of technology, people have put forward higher and higher requirements for the quality of cars. The car has gradually transitioned from the initial demand for transportation tools to safety, comfort, In terms of economy and driving pleasure, people's demand for multi-function, multi-road driving and high-performance vehicles is also increasing year by year, such as high-performance four-wheel drive SUVs or high-performance four-wheel drive cars. These models are not only increasingly demanded in the internal combustion engine drive market, such as the Audi Q5 SUV with a sports differential, the Acura TLX mid-size sedan with a ...

AI Technical Summary

Problems solved by technology

When the power is transmitted to the front and rear axles at the same time by manipulating the central differential to become four-wheel drive, since it generally does not have a central differential, it cannot drive at high speed on normal paved roads, and can only perform low-speed off-road on non-paved roads.

Moreover, due to the body structure, vehicle weight, no differential, tires, etc., the driving economy and handling stability when combined with four-wheel drive are far from other four-wheel drive vehicles, so it is difficult to apply to high-end four-wheel drive cars and high-performance SUVs.

[0005] On the whole, the full-time four-wheel drive form is relatively good, but because the ordinary differential it adopts has the characteristics of "differential speed and torque", when the road surface adhesion of the front and rear axles of the car is inconsistent, it may cause the axle on the side with low adhesion. The wheels on the wheel slipped, causing the car to be trapped and unable to move

Or when the car accelerates rapidly, the load is transferred from the front axle to the rear axle, which may also cause the front axle wheels to reach the adhesion limit and slip and cause the car to become unstable.

Although various inter-axle limited-slip differentials or inter-axle differential locks in the prior art can partially or completely lock the transmission shafts connected to the front and rear axles, so as to realize the transfer of torque from low-attachment axles to high-attachment axles, avoiding Wheel slipping improves vehicle passability, but the transfer and distribution of torque between axles is unidirectional, and the driving torque can only be transferred from the fast-rotating axle to the slow-rotating axle, which cannot improve the maneuverability of the vehicle under various road conditions performance and drive

The central differential on a traditional car can only change the speed of the two axles, but cannot distribute the torque. Although the central differential can realize the distribution of the torque between the axles, it cannot realize the directional distribution of any torque value between the axles.

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