This invention relates to a two wheeler motor vehicle running on liquid petroleum gas (LPG).
although the two wheeler motor vehicle proposed herein can be made to run exclusively on LPG, from the standpoint of feasibility, it is preferred to have an alternative supply of conventional fuel, such as, petrol, so that the vehicle need not come to a complete stop, should it suddenly run out of LPG supply or if LPG cylinders are not readily available. This alternative fuel supply is achieved by a selector switch arrangement similar to that employed in four wheeler motor vehicles running on LPG and on alternative conventional fuel.
Use of LPG as fuel for propulsion of automobiles offers advantages of low running costs, lower emissions, longer engine life and lower maintenance costs when compared to their gasoline/diesel counterparts. LPG as fuel has also been found to be non-carcinogenic, non-lead-bearing. It has further been found that leaner mixtures of LPG can be combusted and higher

compression ratios can be obtained due to the higher octane number and because the fuel is in gaseous form.
LPG is being commercially used in automobiles in Australia, Japan, USA, Holland, Italy, New Zealand among other countries.
Efforts are being made in India, which has a huge motor vehicle population, for use of LPG in automobiles, with adequate safeguards. The LPG commercially available in India is a mixture of butane, and. propane with traces of other hydrocarbons.
This invention proposes a two wheeler motor vehicle running on LPG, the vehicle being adequately protected against all hazards which are the likely outcome of storing, carrying and utilising the said gas on a highly mobile two wheeler motor vehicle which is subject to hazards, such as, skidding, toppling and impact, like collision.
This invention also proposes a vehicle as aforesaid which is highly user-friendly in the

operation of the LPG system including installation and replacement of LPG cylinders in the vehicle.
:wo wheeler motor vehicle will be apparent from the '^^^^^J^jj^ A^ Lf Q-following further description.
The two wheeler motor vehicle, according to this invention, comprises a housing, open at its top and immovably located in a cavity under the rider's seat of the vehicle, the housing being provided with at least one vent-hole open to atmosphere;. a replaceable - LPG cylinder accommodated within the housing and securely fastened thereto; a pipeline connecting the outlet of the cylinder to the engine of the vehicle through prescribed safety devices; and means for permitting the LPG to flow through the pipeline only when the cylinder is fully fastened within the housing and the ignition switch of the vehicle is turned ON thereafter.
This invention will now be described with reference to the accompanying drawings, which illustrate, by way of example, and not by way of limitation, one of various possible embodiments of

this Invention, wherein
Fig. 1 illustrates the proposed vehicle in top plan view
Fig. 2 illustrates the proposed vehicle in side elevation
Fig. 3 illustrates the hinged seat and seat base of the proposed vehicle in open.and partly closed position, with the cross-artt in open position
Fig. 4 Illustrates the housing (interior) with the seat base covering the open top of the housing annd the cross-arm clamped down and fastened.
Fig. 5 illustrates the LPG cylinder-housing, assembly with the cross-arm in clamped-down position
Fig. 6 illustrates the safety electrical circuit which includes, in series, two limit switches, a solenoid valve and the ignition switch connected through a battery.
Fig. 7 illustrates the replaceable cylinder, diametral member and non-rotatable nut

and
Fig. 8 illustrates the layout of the selector switch arrangement.
The housing H is covered by the seat base and the seat at the top HT. It is immovably located in a cavity ^ under the rider's seat of the vehicle.
The housing is made of a strong material such as steel to protect the LPG cylinder and related fittings from shocks, impact with external objects and static and dynamic loads. The housing is provided with at least one vent-hole V , which is open to atmosphere and which allows escape of LPG in the unlikely event of a gas-leak occurring. In the drawings, the housing is shown to have two vent-holes V. Each vent-hole will be provided with flame proof gauze.
The LPG cylinder C is accommodated within the housing H and securely fastened thereto. -
A pipeline P connects the outlet O of the cylinder to the engine E of the vehicle. The vaporizer VA and gas carburettor GC are shown connected to the

pipeline.
Means are provided for permitting the LPG to flow through the pipeline P to the engine E only when the cylinder c is fully fastened within the housing H and the ignition switch I of the vehicle is turned ON thereafter. Where provision is made for supply of alternative conventional fuel, the further requirement of flow of LPG through the pipeline P to the engine E is subject to the selector switch SW being operated to shut off such alternative supply as will hereinafter be clear.
The bottom J of the cylinder C and the base M of the housing H are provided with fastening means for securely fastening the cylinder C to the said base M.
One of possible forms of such fastening means is constituted by a foot-ring F provided at the bottom of the cylinder C. The foot-ring F is rigidly attached to the bottom J of the cylinder C. A diametral member D, which diametrally spans' the foot-ring F is rigidly attached thereto. To the diametral member D a nut N is fixed such that

it is non-rotatable. To the base M of the housing H a threaded stud T is fixed. The stud T is threadedly engageable with the nut N, for enabling the bottom J of the cylinder to be securely fastened to the base M of the housing.
The housing H is provided with a pivotably movable cross-arm A (pivoted at L) for being clamped down on the top Q of the cylinder C, to totally restrain movement of the cylinder in any direction. The cross-arm is securely fastened to the housing by a bolt G.
One of possible means for permitting the LP6 to flow through the pipeline P to the engine will now be described:
A first normally-open limit switch SI is provided within the housing H near its base M for coming into pressure-contact with the bottom J of the cylinder, whenever the cylinder occupies its lowermost position, after the nut N and threaded stud T are fully fastened.
A second normally-open limit switch 32 is provided within the housing near the top Q of the cylinder

for coming into pressure-contact with the cross arm A after it has been fully clamped down 6n the top Q of the cylinder. A normally-closed solenoid valve Z is provided for the pipeline P, the limit switches SI, S2 and the solenoid valve Z being included, in series, in the electrical circuit of the ignition switch I of the vehicle. The arrangement is such that when the limit switches Si, S2 are actuated to close, on achieving pressure-contact with the bottom J of the cylinder and with the cross arm A respectively; and when the ignition switch I is turned ON, the said circuit is closed to energise the normally-closed solenoid valve Z to open, once open, LPG from the cylinder C flows through the pipeline P to the engine, subject to the action of the selector switch in cases where provision is made for alternative conventional fuel supply.
The outlet o of the cylinder C is provided with a coupling R for connection to the pipeline P, the coupling being disposed horizontally so that the pipeline can also run horizontally within the housing and thus save housing space.

The housing H is immovably located in the cavity K by securely attaching it to the surrounding framework of the vehicle.
The base U of the rider's seat Y rests on the open top HT of the housing to serve as a cover. The housing is uncovered, whenever required, to obtain access to the interior by raising the said seat.
The base U of the rider's seat is sufficiently rigid to provide adequate structural strength thereto. Such rigidity is obtained, for example, by providing a thick strong plastic sheet on the said base.
As stated earlier, whenever there is provision for an alternative conventional fuel supply the system proposed herein will work on LPG only if, in addition to the conditions stated herein, the conventional fuel supply is shut off by the selector switch SW. So also, the system will work on conventional fuel supply only if, thfe LPG supply is shut off by the selector switch. Conveniently, the selector switch will be placed within the housing or any other suitable safe

location, for safety.
The rider's seat is hinged at W and the seat is also provided with a lock so that it cannot be raised, by unauthorised persons, to expose the interior of the housing.
In the drawings the excess flow cum shut off valve and the pressure relief valve provided for the cylinder are indicated by EF and PR respectively. The gasoline tank is indicated by GT and the gasoline solenoid valve is indicated by GS.
The terms and expressions in thld specification are of description and not of limitation, there being no intention, in the use of such terms and expressions of excluding any equivalents of the features illustrated and described, but it is understood that various other embodiments of the proposed two wheeler are possible, without departing from the scope and ambit of this invention.

We Claim:
1. A two wheeler motor vehicle runnihg on LPG
comprising a housing, open at its top and
immovably located in a cavity under the rider's
seat of the vehicle, the housing being provided
with at least one vent-hole open to atmosphere; a
replaceable LPG cylinder accommodated within the
housing and securely fastened thereto; a pipeline
connecting the outlet of the cylinder to the
engine of the vehicle through prescribed safety
devices; and means for permitting the LPG to flow
through the pipeline only when the cylinder is
fully fastened within the housing and the ignition
switch of the vehicle is turned ON thereafter.
2. A two wheeler motor vehicle running on LPG as claimed in Claim 1 wherein the vent-hole is provided with flame proof gauze.
3. A two wheeler motor vehicle running on LPG as claimed in Claim 1 or Claim 2 wherein the bottom of the cylinder and the base of the housing are provided with fastening means for securely

fastening the cylinder to the said base.
4. A two wheeler motor vehicle running on LPG
as claimed in Claim 3 wherein the bottom of the
cylinder has a foot-ring rigidly attached thereto;
a diametral member is disposed on the foot^ring
and rigidly attached thereto, said member being
provided with a non-rotatable nut; and the base
of the housing has a threaded stud rigidly
attached thereto, the said stud being threadedly
engaged with the nut, for enabling the bottom of
the cylinder to be fastened to the base of thd
housing.
5. A two wheeler motor vehicle running on LPG as claimed in Claim 3 or Claim 4 wherein the interior of the housing is provided with a pivotably movable cross-arm for beihg clamped down on the top of the cylinder and securely fastened to the housing.
6. A two wheeler motor vehicle running on LPG as claimed in Claim 5 wherein the cross-arm is securely fastened to the housing by a bolt and nut.

7. A two wheeler motor vehicle running on LPG as claimed in any one of the preceding Claims wherein the said means for permitting the LPG to flow through the pipeline to the engine comprise a first normally-open limit switiih provided within the housing near its base for coming into pressure-contact with the bottom of the cylinder whenever the nut and threaded stud are in full engagement; a second normally-tjpen limit switch provided within the housing near the top of the cylinder for coming into pressures-contact with the cross-arm in its fully clamped down position; and a normally-closed solenoid-valve provided for the pipeline, the limit switches and the solenoid- valve being included, in series, In the electrical circuit Of the ignition switch of the vehicle, the arrangement being Much that when the limit switches are actuated to close, on achieving pressure-contact with the bottom of the cylinder and with the cross-arm respectiv^y, the solenoid-valve is energised to open whenever the ignition switch is tutned ON thereafter.
8. A two wheeler motor vehicle running on LPG

as claimed in any one of the preceding Claims wherein the outlet of the cylinder is provided with a coupling for connection to the pipeline, the coupling being disposed horizontally.
9. A two wheeler motor vehicle running on LPG as claimed in any one of the preceding Claims wherein the housing is immovably located in the cavity by securely attaching it to the surrounding framework of the vehicle.
10. A two wheeler motor vehicle, running on LPG as claimed in any one of the preceding Claims wherein the base of the rider's seat rests on the open top of the housing to serve as a cover, the housing being uncovered by raising the said seat.
11. A two wheeler motor vehicle running on LPG
as claimed in Claim 10 wherein the seat is
provided with a lock.
12. A two wheeler motor vehicle running on LPG
LPG as claimed in Claim 10 or Claim ll wherein
the base of the seat is sufficiently rigid to
provide adeguate structural strength thereto.

13. A two Wheeler motor vehicle running on LPG
as claimed in any one of the Claims 10 to 12
wherein the base of the seat is provided with a
thick, rigid, plastic sheet.
14. A two wheeler motor vehicle running on LPG as claimed in any one of the preceding Claims wherein the vehicle comprises an alternative source of conventional fuel supply; and a selector switch permitting either only the LPG or the conventional fuel to be supplied to the engine of the vehicle.
15. A two wheeler motor vehicle running on LPG as claimed in Claim 14 wherein the selector switch is disposed within the housing.

16. A two wheeler motor vehicle running on LPG as claimed in any one of the preceding Claims wherein the cylider is provided with a pressure relief valve.
17. A two wheeler motor vehicle running on LPG as claimed in any one of the preceding Claims wherein the cylinder is provided with an excess flow cum shut off valve.

18. A two wheeler motor vehicle running on LPG
as claimed in any one of the preceding Claims
wherein the pipeline connecting the outlet of the
cylinder to the engine is provided with a gas
carburettor.
19. A two wheeler motor vehicle running on LPG
substantially as herein described with reference
to, and as illustrated in, the accompanying
drawings.