JPS6042129A - Four-wheel drive car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION This invention relates to transmission systems for four-wheel drive vehicles, and more particularly to systems that are useful in high performance saloon type motor vehicles.

[Summary of the invention]

The present invention provides a four-wheel drive vehicle having an engine, a front axle, a rear axle, and a gearbox, which includes a simple planetary gear device that receives driving force from the engine as its input, and one axle is a planetary gear. Driven from the first output of the device via a gearbox, the other axle is
It stands directly driven from the second output of the planetary gear train.

In preferred vehicles, the rear axle is driven via a gearbox. In its preferred form, the planetary gearing comprises:
Such as consists of a sun gear, a planetary gear and its carrier, and an annular body, said carrier acting as an input shaft connected to an engine, and said annular body driving one axle through a gearbox. The sun gear acts as a second output connected to drive said other axle.

[Example] In order to better understand the present invention, the following examples are given below.
This will be explained with reference to the attached drawings.

In the figure, the engine 1 is a simple planetary gear set (slm
(ple epicic gear) 2 drives the carrier 14 of the planetary gear 13. car front axle 10
is driven by the shaft 11 from the sun gear 12. Car rear axle 20tI'i, normal manual gearbox (MG)
IT is driven by the annulus 16 of the planetary gear system 2. A threaded vibration damper 15 is mounted on the carrier 14 to damp the input from the engine 1. The damper may be installed optionally and may be of the damping mass type or of the viscous type.

The torque distribution between the front and rear axles, performed by a simple planetary gear 2, is a function of the gear ratio selected in the gearbox (MG or AG). One advantage of the planetary gear system 2 is that it can be used with a Reno gearbox, which is similar to a standard ratio saloon car gearbox.

The torque distribution achieved by the planetary gearing 2 in combination with the gearbox is designed to be most suitable for the intended use of the vehicle. Table 1 below shows a typical example of a system using a standard five-speed forward gearbox.

Table 1 The torque distribution of gear 1, that is, the first gear, is approximately 1:3.
Proportionate dynamic weight transfer to maximize drag. Approximately 3=2 distribution in top gear provides speed stability. By selecting an intermediate gear, an optimum torque distribution is obtained when starting the vehicle on slippery surfaces. It will also be appreciated that in low gears, the high torque ratio provided to the rear axle facilitates throttle maneuvering around low speed bends.

The effect of torque distribution is to allow the use of less rated standard transmissions. For example, for a 310 bond ft (4,4 Nm) engine, a 77 m
m transmission devices can be assigned.

Furthermore, a lighter front axle and drive shaft can be used. Why is it that some of the maximum engine torque (for example, 6
3%) is transmitted. That is,
This will also reduce torque reaction due to maneuvering.

The invention has been described with respect to a saloon type automobile.1 fC
However, the present invention can also be implemented in other four-wheel drive vehicles.

[Brief explanation of drawings]

The drawing shows a four-wheel drive transmission system with two alternative gearboxes and a simple planetary gearbox. 1. Engine, 2. Planetary gear system, 10.
...Front axle, 12...Sun gear, 13...Planetary gear, 14...Carrier, 1γ...Input, 2o...Rear axle.

Claims (5)

[Claims] (1) In a four-wheel drive vehicle having an engine, a front axle, a rear axle, and a gearbox, the engine
one axle is driven from a first output of said planetary gearing via a gearbox, and the other axle is driven from a second output of said planetary gearing. A four-wheel drive vehicle characterized by being driven directly from the (2) The four-wheel drive vehicle according to claim 1, wherein the rear axle is driven via a gearbox. (3) The planetary gear system consists of a sun gear, a planetary gear having a planetary gear carrier, and an annular body, the carrier acts as an input connected to the engine, and the annular body is connected to the engine via a gearbox. a first output connected to drive one axle and a second output connected such that the sun gear drives the other axle;
83. A four-wheel drive vehicle according to claim 1 or 82, characterized in that it acts as an output. (4) By selecting one of the forward gears, the torque distribution between the front axle and the rear axle is approximately 1:3;
Claim 1, characterized in that the ratio of the gearbox is such that by selecting two forward gears, the torque distribution between the front axle and the rear axle is approximately 3:2. A four-wheel drive vehicle as described in item 2 or 3. (5) The four-wheel drive vehicle according to claim 1, 2, 3, or 4, wherein the planetary gear device includes a screw damper connected to the planetary gear carrier.