IMPROVEMENTS TO L.P.G. (LIQUID PROPANE GAS) TANKS, IN PARTICULAR WITH REFERENCE TO THE POSITIONING OF THE VALVE GROUPS

Abstract: This invention concerns improvements to toroidal-shaped L.P.G. tanks (1) which, due to their particular shape, may be easily placed inside the spare wheel compartment (10). In the toroidal-shaped tank described herein the hollow centre of the tank is used for positioning the valve group connection rings (3), which may either project or be flush-mounted and also for allowing the passage of the pipes (4, 5) for connecting the tank with the engine fuel supply system and the filler. The valves are placed between a lid (6), at the top, and a bottom plate (7) tide to each other in such a manner as to constitute an airtight chamber.

Description: Description Improvements to L.P.G. (liquid propane gas) tanks, in particular with reference to the positioning of the valve groups Technical Field This invention concerns improvements to toroidal- shaped L.P.G. tanks which, dye to their particular shape, may be easily placed inside the spare wheel "compartment. In the toroidal-shaped tank described herein the hollow centre of the tank is used for positioning the valve group connection rings, which may either project or be flush-mounted and also for allowing the passage of the pipes for connecting the tank with the engine fuel supply system and the filler. The valves are placed between a lid, at the top, and a bottom plate tied to each other in such a manner as to constitute an airtight chamber Backe otmd Art In L.P.G. tanks and, in particular, in the toroidal- shaped tanks produced to date, the fuel-filling valve group is generally located on the outside of the' tank itself, so that it is necessary to make a hole for connecting the valve group with the outside filler. Alternative solutions also patented by the same holder describe the possibility of positioning the multivalve connection ring in a recessed position, with regard to the tank walls. Such a solution, however, determines bulky appendixes which may cause problems. Disclosure of Invention This invention provides for a toroidal-shaped tank with the possibility of positioning the multivalve ring, for both the Italian and the foreign markets, inside the hollow centre of the tank, either projecting or flush- mounted in the tank itself, allowing the passage of the two pipes which.connect the tank with the engine fuel supply system and the filler, said pipes passing through small holes specifically designed for the ventilation of the chamber, by means of a breather flange located on the bottom of the luggage compartment (and protected on the outside by a carter), in order to position it in the best possible manner possible for fuel filling from the outside. In order to prevent any pollution of the air or of the luggage compartment and, therefore, any leaks into the passenger compartment, the chamber in the middle of the tank housing the valves is sealed by a lid at the top and a plate at the bottom, strongly fixed to each other by means of a tie rod. The top lid has a transparent window in " the middle so that the valves may be inspected. Furthermore, the space between the tank and the tank- housing in the luggage compartment is also sealed, in order to prevent any leaks, thus creating a chamber which is airtight towards the inside of the vehicle and which may discharge any leaks towards the outside of the vehicle through the holes bored for the passage of the pipes. The foregoing summary explanation may ' be better understood from the following detailed description, making reference to the attached drawings, in which: Fig. 1 shows a cross-section of the preferred positioning of the valve connection rings on a toroidal- shaped tank placed in a luggage compartment . Fig. la shows a cross-section of the toroidal tank described herein housed in the spare wheel compartment. Fig. lb shows a bird's-eye view of the tank shown in the fig. la. Fig. lc shows some details of the fastening of the tank and the bottom plate gasket. Fig. Id shows a side view of the top lid of the valve chamber. Fig. 2 shows a bird's-eye view of the toroidal-shaped tank. Figs. 3 to 13 show various possibilities of positioning the valve connection rings. Figs. 14,15 and 16 show a cross-section of the valves placed in a flush-mounted position. Figs. 17,18 and 19 show the positioning of the central multivalve group, in respect of the hollow space in the centre of the tank. With reference to the above mentioned figures, and in particular to fig. 1, the L.P.G. tank described herein consists of a toroidal-shaped tank (1) on the sides (2) of which, facing towards the hollow space in the centre, are positioned two or more rings (3) for connecting the valve groups. Two pipes (4) and (5) pass through the middle hollow part of the tank (1): one leads from the tank filling valve to the filler, which may also be placed on the outside of the vehicle, while the other leads from the fuel supply valve to the engine fuel supply system. The valves, positioned on one or more of the rings (3), are closed between a lid (6) at the top, which is sealed by special screws or other sealing means and a plate (7) at the bottom, so as to prevent even the smallest leaks from entering the vehicle passenger compartment. The airtight lid (6) is screwed to the tank together with the bottom plate (7) by means of bolts (8) or other similar and, preferably, fast-closing means, which also fix the one to the other, thus ensuring that they adhere tightly to the outside surface of the tank (1). The lid (6) is also provided with a transparent window (9), made of glass or other similar material, allowing the inspection of the valves without having to open the airtight chamber. Fig. la shows a cross-section of the tank (1) according to the usual manner of installation inside the spare wheel compartment (10). In the hollow space in the centre of the tank (13), on one of the sides (2) of the tank (1) facing towards the inside, there is a multivalve group (14) which, in the Italian version, carries out the gas filling, distribution and regulation functions and which is also provided with a gauge for checking the gas level in the tank. Two pipes (4) and (5) are used for filling the tank and feeding the engine fuel supply system, respectively. The toroidal-shaped tank may be perfectly fitted inside the spare wheel compartment (10); the hollow space in the centre of the tank (13) is closed at the bottom by a plate (7) and between said plate (7) and the tank (1) there is an expanded polyethylene gasket (15), which is tightly fixed to the tank by means of two anchored tie rods, which may be better observed in fig. lc; said tie rods are fixed to the tank by means of special brackets (18) and nuts C19) and to the bottom plate by means of a nut (20) screwed on the tie rod passing through a hole, bored through the bottom plate and sealed by means of a specific gasket (21). The upper brackets, besides serving the aim of clamping the bottom plate, also further fasten the multivalve group and carry the holes (22) in which the setscrews (23) of the top lid are screwed, best seen in fig. Id.. The entire space between the side and bottom walls of the toroidal-shaped tank (1) and the vehicle spare wheel compartment is filled with a special sealing material (24), in order to absolutely prevent any gas-leaks penetrating inside the vehicle passenger compartement . For the ventilation of the multivalve group chamber there are two breathers (26) and (27), one of which faces the direction of movement of the vehicle and the other faces the opposite direction, so as to create a balanced circulation within the chamber. The breathers are protected by a metal carter (28). The whole device is covered by the rubber mat of the luggage compartment, which can be used without any particular problems. As previously stated, fig. 1 shows the preferred solution with regard to the valve and valve group _ _ positioning, but it is obvious that many other positions are possible, ideas being given in figs, from 3 to 16, both inside and outside the hollow space in the centre of the tank, some of the solutions being similar to those provided for in previous patents by the same holder. Figs. 17,18 and 19 show how the valve group may be placed not only on the sides of the hoi.low space in the centre of the toroidal-shaped tank, but also on the plate at the bottom of said space or even on a level parallel to said plate and at a predetermined height from the bottom. Fig. 19 also shows that the hollow space need not necessarily be right in the middle of the tank, but may also be slightly removed, if such a solution should prove more useful or easier to install.

Claims: Claims 1. A toroidal-shaped tank which may be housed inside the spare wheel compartment and provided with one or more valve connection rings, for the filling, engine fuel supply, measurement and distribution of the gas, said connection rings being positioned on the wall of the tank, in the hollow space in the centre of the tank (13). The valves or multivalve group mounted on sai'd connection rings are connected, by means of two pipes (4) and (5) 10 passing through the central hollow part, to the fuel filler and the engine supply system. 2. A toroidal-shaped tank (1) for L.P.G. (liquid propane gas), according to claim 1, characterized by the fact that the hollow space in the centre of the tank 15 housing the valves is closed by a lid (6) at the top and a plate (7) at the bottom, so as to create an airtight chamber. Between the bottom plate (7) and the tank (1) there is an expanded polyethylene gasket (15) and the bottom plate (7) is tightly fixed to the tank itself by 20 means of two anchored tie rods (16) and (17), which are fixed to the tank by means of special brackets (18) and nuts (19) and to the bottom plate by means of a nut (20) screwed on the tie rod passing through a hole, bored through the bottom plate and sealed by means of a * •* * • ' Specific gasket (21); alternatively, the bottom plate may be welded directly to the tank 3. A toroidal-shaped tank, according to the foregoing claims 1 and 2, characterized by the fact that the multivalve group chamber is adequately ventilated by two breathers (26) and (27), one of which faces the direction of movement of the vehicle and the other faces the opposite direction, so as to create a balanced circulation within the chamber. Said vents also allow the passage of the two fuel filling and engine fuel supply pipes ( ) and (5) . 4. A toroidal-shaped tank, according to the foregoing claims, characterized by the fact that the top lid is tightly closed by means of setεcrews (23) and is provided with a transparent window (9). 5. A toroidal-shaped tank, according to the foregoing claims, characterized by the fact that the space between the tank walls and bottom and the spare wheel compartment is filled with a sealing material (24). 6. A toroidal-shaped tank, according to the foregoing claims, characterized by the fact that the valve group may be placed not only on the sides of the hollow space in the centre of the tank, but also on the plate at the bottom of said space or even on a level parallel to said plate and at a predetermined height from the bottom. 7. A toroidal-shaped tank, according to the foregoing claims, characterized by the fact that the hollow space need not necessarily be right in the centre of the tank, but may also be slightly removed, if such a solution should prove more useful or easier to install.

Inventors: CIPPITANI LUCIANO, CIPPITANI, LUCIANO
Applicants: ICOM SRL, I.C.O.M. S.R.L.
Application year: 1992
Main classification: F17C13
IPC codes: B60K15, F17C1, F17C13