CA2227433A1 - Back wheels twin axles drive system for compact vehicles - Google Patents

Abstract

The new invention takes advantage of a dual axles drive system, on the rear wheels traction of a vehicle, whereby the first axle the "back-up axle" is powered to turn in a backward direction which power is than transferred to the "wheels drive axle" located in front of the first axle, by means of transfer gears, one on each sections, that changes the backward direction of the first axle to a forward wheels drive on the second axle, gaining thru said combination, the advantage of a downward theist of the drive pinion and driveshaft to which vehicle is attached, thus preventing the overturning of said vehicle when the wheels are blocked while the engine is running and clutch is not released in time as can happened in conventional one axle drive system of existing compact vehicles.
The object of this invention is to replace the single axle driving system, presently used by an integrated twin axle driving system on rear wheels of compact vehicles such ase jeeps, farm tractors, or «A.T. V.» all terrain vehicle, in order to take advantage of a backward drive combine with a gears's system which can prevent the overturning of vehicles in certain instances.

Description

BACK WHEELS TWIN AXLES DRIVE SYSTEM FOR COMPACT VEHICLES
Abstract The ne'w invention takes advantage of a dual axles drive system, on the rear wheels traction of a vehicle, whereby the first axle the "back-up axle" is powered to turn in a backward direction which power is than transferred to the "wheels drive axle" located in front of the first axle, by means of transfer gears, one on each sections, that changes the backward direction of the first axle to a forward wheels drive on the second axle, gaining thru said combination, the advantage of a downward thrust of the drive pinion and driveshaft to which vehicle is attached, thus preventing thE; overturning of said vehicle when the wheels are blocked while the engine is ruing and clutch is not released in time as can happened in conventional one axle drive system of existing compact vehicles.
The object of this invention is to replace the single axle driving system, presently usedl by an integrated twin axle driving system on rear wheels of compact vehicles such ase jeeps, farm tractors, or «A.T. V. » all terrain vehicle, in order to take advantage of a backward drive combine with a gears's system which can prevent the overturning of vehicles in certain instances.
Description:
When the vehicle is equipped with a differential sun gear, it is preferrable to install the double axles combination inside the Gears' housing (9), as described herewith.
The first axle named the Back-up axle (1) is the substitute axle which replaces the single axle's system. Energy will be provided to this axle thru the combine action of the Pinion drive gear (3) to the Ring gear (4) fixed on the Differential case {8). Said case is supported at both ends by Bearing (7) clamped in place on the Housing (9).
This back-up ;aide is divided into two sections the right ride and the left axle. They are independent from one to the other, they can run jointly at the same speed, or at a different sp eed, in relative rotation from one to another, but the sum of their rotation rates is constant, on account of the differential's Sun gear (10).
Each shaft will rest at one end on the bevel gear of the differential while the other end will be installed on a Bearing (7) supported by the exterior wall of Gears' housing (9) where they will end. Contrary to the frontward direction for the usual single axle driving shaft, the back-up axle will rotate in the opposite direction, that is in a backward direction of tb~e vehicle.
The second axle is the Wheels's drive axle {2) that provides locomotion for the rear wheels of the vehicle. This driveshaft is also subdivided in two sections: the right wheel sb~aft and the left wheel shaft. Each section will be secured to Housing (9) by means of two removeable Bearings (7) clamped in place; one installed in the interior, the ether on the outside wall of said housing or at the end of Shaft's housing {11).
These two double sections axles are joined together in pairs of right and left axles, by means of Tranfer gear (5) which are here located in between supporting bearings passing thru and secured to each section of axle and facing one another, in

2/3 order that each impulse given to one's axle is transferred to the other axel in a reversed direc;tion. Since the Back-up axle is turning in a backward direction the wheels drive shaft will therefore run in a forward direction.
These two a:cles are integrated and interrelated so as to perform jointly and independently. The N~ 1 Back up axle provides power to N~ 2 axle, which in turn transmit the wheels' generated action back to the differential of N~ 1 axle.
Both axles performing to;;ether and acting as one single axle driving shaft.
How the invention operates To illustrate the way the two axles drive system Fig. 2 solves the problems inherent to sl:andard one axle drive system Fig. 1, we will compare how the two systems operate as shown in schematic drawings Fig. 1 and Fig. 2 (back wheels section of a four wheels drive vehicle) .
For comparai;~on purpose, in both schemas it is assumed that the driveshaft of the vehicle with i1a pinion drive (3} which sets the Wheels (6) in motion are turning in the same direction, that is in a clockwise rotation.
When the vehicle is running the Ring gear, the Differential case, the axles and the wheels are synchronized to turn simultaneously in the same direction.
In the standard method of one axle vehicule as shown in Fig. 1, the Ring gear (4) in order to direct the Wheels (6) forward, has to be placed on the left side of the pinion or of the vehicle. In this way the ring gear is turning in a downward direction. If the ring gear blocks in place while the pinion drive is still in motion said pinion will roll by itself upward around the ring gear as shown in dotted line in drawing Fig.
1.
This fact is the source of the problem causing the upward lift of the front part of a standard vehi<;le. It can cause very serious accidents such as a complete overturning of pinion drive gear that can carry the vehicle all the way around towards the back, even to land i:n an upside down position, if the clutch is not disengaged in time.
Such accidents can be prevented with a dual axle drive system as shown here in Fig. 2, and Fig. 3. Power is transmitted to the vehicle thru means of two axles.
The first axle is the Back up axle (1) which is set in motion by the Pinion drive (3).
and Ring gear {4) thru the Differential case (8) as here indicated in the present schema. Sine: the Back up axle does not contain the wheels, it can be set to turn in a back up direction, which means that the ring gear has to rurn in an upward direction that is from a down to up position. To achieve this goal the Ring gear (4) has to be located on the right side the vehicle and of the Pinion drive (3).
See section thrue :Ring gear and Pinion Fig. 2.
Power i.s then transferred from the back up axle to the Wheels' drive axle, which contains the wheels, by means of round Transfer gears (5) installed one on each section of axle, that converts the back up direction of first axle to a forward drive on the second axle.
Thru said combination of directional axles, if for some reason said Ring gear blocks in plaa~ while Pinion is still in motion, said Pinion will travel downward along Ring gear, carrying and pressing the vehicle toward the ground which is the goal and achievement of present invention and prevents the capsize of vehicle.

3/3 Optional aura~ngement for twin axles and transfer gear The sarne results as described in the above mentionned operations can be obtained thru the arrangement of an integrated self contained Twin axle box (12) placed outside: on each side of the differential Housing (9) as shown in Fig.4 - Fig. 5 and Fig. 6. Or otherwise located at the end of the wheel's housing.
Said Twin axlE;s box (12) contains the following parts:
- The Backup axle (1) and the Wheels' axle (2) equipped with permanent Transfer gear (14) one on each axle.
- One end of each axle rests inside the two Box's cover (15) on Rollers' bearing { 16} while the N~ 1 axle extends into the differential gears { 10) while the N~ 2 axel extends outside the box to support the wheels.
- The Box's body (13) is the implement supporting the twin axles and both Cover' plate { 15). Said parts are held together by means of a serie of bolts and h~~les (17) thru Body (13) and Cover plate {17).
- Each cover plate has an outgrowing profile which contains the Rollers' Bearing ( 16). 'This knob on the cover plate is duplicated in a similar profile on the differential housing, so that both contour's profile fit tightly together allowing said bo:c to hold firmly to said differential housing and secured in place by means of Bolts (17} passing thry Plates' cover (15) and screwed to Housing; (9}.
- Fig. 4 -- Shows the complete Twin axle box ( 12), secured to differential's housing.
- Fig. 5 - Shows the Cover's plate 15 with Holes for bolts {17} and with the knob's profile containing the Roller bearing. Optional oil access ( 18}.
- Fig. 6 - Shows the axle 1 and 2 integrated with Transfer gear ( 14}
contained within Fsox's body (13).
Four wheels' dlrive In case of four wheels driving power as illustrates in Fig. 1 and Fig. 2, the driveshaft and the pinion of the front wheels are in both case turning clockwise.
That means that in order to travel forward the ring gear has to turn upward and said ring gear has to be installed on the left side of vehicle contrary to the back wheels' ring gear. This is the way that the front wheels drive is already installed on the present vehicles, and for the front wheels the tendancy is to have a downward thrust when front wheels or ring gear is blocked. So there is no need to change anything since the dual axle arrangement is not required. Outside of reduced danger for the vehicle's capsize and reduced insurances fees, the newly equipped vehicle with twin axle combination should allow to obtain other advantages in driving performances such as the possibility to climb steeper hills and pull heavier loads than the standard vehicle and with less danger.
If in sorne instances the vehicle is blocked into a hole, by placing the gears in a back up drive said vehicle shoud receive an upward boost from the back and the front wheels which should help to disengage the vehicle.

Claims