FR2478766A1 - External differential lock for motor vehicle - has two gears with keyed ends on common axle which descend to enmesh gears keyed to respective half-shafts - Google Patents

Abstract

The external differential-lock may be used on automobiles, preventing differential rotation of the two output half shafts on icy roads. Gear wheels are keyed to each of the half shafts, and locking gear-wheels are keyed to the opposite ends of the axle. The axle comprises the offset bar of a pivotable stirrup operated by a cable from the dash board. The stirrup pivots about an axle to lower the wheels into engagement with the gear wheels which must now revolve at the same speed with the differential effectively by-passed. The first axle may be in two parts with a dog coupling providing angular float between the gear wheels.

Description

NEIGHBOR Marc Joseph present
AT/. LOCK OF EXTERNAL DIFFERENTIAL.

B / The technical field of the invention is the automobile.

C / So far, differential locks with or without sliding
are reserved for rare very expensive "all terrain" vehicles.

These blockages only very rarely exist on vehicles of
low or mid-range acquired by few fortunate lovers of
off-road or off-road, raids etc. When they exist
blocks require, for their installation, removal and disassembly
from the bridge, from the gearbox or from the transfer to differential.

The system that I propose democratizes the real all-terrain because it
allows common vehicles, accessible to all, to cross
insurmountable difficulties without differential lock;
snow, glaoe, sand, mud.

D / This differential lock includes 2 fixed gear rings (I)
at the output of the crankcase and concentrically with the axes of
planetary original differential, on transmissions
going to the wheels. In order to block the differential the crown
right and left oouronne are joined together by
through a transverse shaft (3) comprising at its
ends 2 counter crowns (2) .The transverse shaft (3) is
interrupted in the middle, and each half cannot turn without
the other thanks to a system of knocks; these tocs authorize a
angular tolerance to facilitate ltenolanohement of cons
crowns on crowns. A fork (4) guides the gear
crowns (I) and (2). A support (5) fixed on the housing
mud or truss ensures an oorreote oscillation of the fork
and therefore a good alignment of the crowns between them. An order
(6) by steering wheel on the dashboard allows to block or not the
differential, but this command can be mechanical by cable,
compass, dog clutch on (3), hydraulic, electric or by several
techniques combined s.

There are derivatives to this basic model, using chains
or constant setting sprockets instead of crowns and
making the two deck exits integral or not by a
order of orabots instead of the tocs of the tree (3) /.

If the axis (3) cannot pass because of the axle housing, plan
an additional relay shaft, parallel to (3), between the crowns
and the crowns. We can also mount crowns (I) of
small diameter and very large crown crowns (2).

E / The attached drawings represent a simplified perspective
the external differential lock mounted here on a rear axle
suspended.

F / The drawing clearly shows the two toothed crowns (I)
can be materialized by brake discs comprising
teeth on their beam and fixed at the bridge exit, before
or Pure transmissions.

The toothed countersinks (2) can be twisted in steel
The teeth may be only case hardened, which is not very oneral.

The shaft & knobs is a simple tube mounted on bronze rods and the knocks are welded on flat irons to the same welded on
flat bars perpendicular to the tube. The fork (4) guiding the
counter crowns is a cold drawn square tube of 40 m / m
side, as well as the support (5). The command is a simple rod
threaded screwing into a fixed support thanks to the @ancenrre
a small steering wheel on the dashboard.

C / All that parts can, except for crowns and
counter crowns, be made with an inexpensive cutillage.

A coat of primer is enough to protect these metal parts from
corrosion because the mechanism is not visible without lifting
the Hood or open the trunk. Chromium plating may be additionally provided
option.

The cost price of the ansamble is low in absolute terms, the price
can be very easily available thanks to standardization
common building blocks. It only remains to predict
special items a few car types. In addition,
when the differential is not locked, no part
does it work does wear only last the
work We save the cost of ball bearings and
noble metals suitable for long stresses.

Claims (1)

 R E V E N D i C A T i N S  The present invention relates to the automobile in the cases or she must cross zpnes or the risks of skating  are important: slope with grass, snow, ice, mud, sand,  In known devices, we find the differential self-locking which is an automatic controlled slip system, reserved for sports cars in order to increase  their accelerations. In the case that interests us, we find the various internal differential locking devices, with manual control without sliding, which intervenes when the vehicle  has one of its drive wheels placed on a surface with little grip: grassy slope, snow, mud, etc. The differential allows, in normal turns, a difference in rotation speed between the right wheel and the left wheel. grip, it skates only, the other remaining immobile. If we force the "right" and "left" wheels to turn together, the motor skills are more than doubled because the two wheels progress but also, it is enough that only one of the two either on an eye-catching coating to drive the car, Currently * the bridges blocked manually are reserved for cars said by mistake "four-wheel drive", especially military and agricultural equipment. All these blockages are internal to the casing and they are almost never found, even as an option, on democratic vehicles which are the joy of lovers of all roads, all terrains, and also that of the less fortunate "raiders" with small utilities. The external differential lock is characterized by a construction entirely outside of the axle, transaxle or differential transfer casings. The mounting of the external differential lock does not require the removal or the disassembly of the bridge, the bridge bofle or the differential transfer. The low cost of such a system allows the less wealthy to equip a car of low value and to practice the real "all-terrain" inexpensively. The assembly can between carried out by an amateur. The system can be quickly transferred to a similar vehicle.  A simple fork carrying two crowns secures two other crowns fixed at the differential outlet, outside the casings: the differential can no longer operate and the car clears the obstacle. This device prevents the auto immobilization in the event of a transmission break. There is no wear during normal operation. There is no maintenance.  ~ A more economical variant can be made by replacing the toothed crowns with trapezoidal or notched belts, bicycle or motorbike chains, pulleys coated with rubber0