JP2001182622A - Fuel gas piping structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel gas piping structure of an automobile for securing safety by immediately exhausting gas to outside air if the gas leaks in the automobile using the gas stored and housed in a fuel gas vessel as fuel. SOLUTION: From a fuel gas vessel arranged on a roof to an engine in an engine room, a ventilable degassing tube 50 for communicating with outside air is run along a fuel gas supply pipe 40 passing through the inside of a cabin from above the roof being penetrated into a cylindrical seal member 60 of a resilient material, and this cylindrical seal member 60 is fastened and fixed to a car body 10a by a fastener 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel gas piping structure for an automobile using gas stored in a fuel gas container as fuel.

[0002]

2. Description of the Related Art In a bus vehicle using natural gas or LP gas stored in a fuel gas container as fuel, the fuel gas container is generally installed under the floor, but in a low floor bus vehicle, the fuel gas container is installed under the floor. Since there is no installation space, it is installed on the roof, and the fuel gas supply pipe is connected from the fuel gas container to the engine at the rear of the vehicle by piping. By the way, it is necessary to take a safety measure so that even if the fuel gas leaks from the fuel gas supply pipe into the vehicle interior, this should not affect the interior of the vehicle. As a means for achieving this, Japanese Patent Application Laid-Open No. 8-99543 discloses a structure for fixing a pipe in a seal of a fuel tank in which a fuel gas supply pipe is covered with a cylindrical seal member.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention JP-A-8-995
No. 43 has a structure in which a joint member in which a locking portion is bulged and formed on an inner surface for fixing a fuel gas supply pipe is provided at an end of a cylindrical seal member and the joint member is fixed to a vehicle body. The seal member and the joint member must be connected, and this portion has a disadvantageous structure against gas leakage.

An object of the present invention is to provide a fuel gas piping structure for an automobile which uses gas stored in a fuel gas container as a fuel and ensures safety by immediately discharging the gas to the outside air in the event of a gas leak. It is to be.

[0005]

According to the present invention, a fuel gas container is installed on a roof, and the fuel gas container and an engine in an engine room are passed from the roof to a vehicle through a vehicle interior. In an automobile in which a supply pipe is connected to a pipe, a fuel-gas supply pipe between the engine room and a roof portion is pierced through a tubular seal member made of an elastic material along a gas-permeable vent tube communicating with outside air. The cylindrical seal member is fastened and fixed to the vehicle body with a stopper.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 11 denotes a bus vehicle, and an engine 9 is mounted in an engine room 12 separated from a vehicle room 10 by a partition at the rear of the vehicle.

A fuel gas container 1 is installed on a roof 3 of the bus vehicle 11 via a mounting member 2. The fuel gas container 1 and the engine 9 are connected to the roof 3 for supplying fuel gas. Outer cabin piping 4 passing from above and the cabin 1 from the roof
The pipes are connected by a vehicle interior pipe 4a passing through the inside of the vehicle.

The present invention is characterized by the interior pipe 4a, and its concrete structure is shown in FIGS.
It will be described based on. In FIG. 3, reference numeral 40 denotes a pipe 4 outside the vehicle compartment.
The fuel gas supply pipe extends from the fuel supply pipe and is connected to a gas charging port 8 which is guided into the engine room 12 and is connected to the engine accessories 7. In addition to the supply of the fuel gas from the fuel gas container 1, the gas filling port 8 connects a gas supply hose to the gas filling port 8 at a gas supply station to supply the fuel gas container 1 with the fuel gas. .

A gas release tube 50 extends along the fuel gas supply pipe 40. In the event that a gas leaks from the fuel gas supply pipe 40 or the like, the vent tube 50 sucks the gas and discharges the leaked gas G to the outside air, and has many small holes 50a. In addition, the tube itself may be a net-like cylinder other than the small hole 50. The fuel gas supply pipe 40 and the gas release tube 50 are passed through the cylindrical seal member 60 made of an elastic material such as rubber or resin.
Is covered with a tubular seal member 60. Outer cabin piping 4
The material of the fuel gas supply pipe 40 containing is suitably stainless steel, and the material of the gas release tube 50 is suitably nylon, but is not limited thereto.

The fuel gas supply pipe 40 and the gas release tube 50 are fastened and fixed to the vehicle body 10a at a plurality of places by a stopper 5 such as a clip band through a cylindrical sealing member 60 penetrating the gas release tube 50. In this case, since the cylindrical seal member 60 is an elastic material such as rubber or resin and has elasticity, the fuel gas supply pipe 40 and the gas vent tube 50 are separated from the cylindrical seal member 60 with the stopper 5 such as a clip band. Even if tightened, it is fixed enough. In addition, the fuel gas supply pipe 40 and the gas release tube 50 can be fixed to the tubular seal member 60 without forming a joint.

The fuel gas supply pipe 40 passing through the inside of the cylindrical seal member 60 is connected to the gas filling port 8 connected to the engine accessories 7 as described above, and the degassing tube 50 has its upper end. Is taken out above the roof to discharge the leaked gas G to the outside air, and the lower end is open to the outside air near the gas filling port 8.

Since the present invention has the structure as described above, the vehicle interior piping 4a, which is guided from the roof through the vehicle interior 10 into the engine room 12, includes a fuel gas supply pipe 40 and a gas release tube 50 formed of a cylindrical seal. Since the gas penetrates through the member 60, even if gas leaks from the fuel gas supply pipe 40, the gas is sucked by the gas vent tube 50 and the leaked gas G is quickly discharged out of the vehicle from above the roof.

Further, the cylindrical sealing member 60 has a heat insulating effect, and prevents the dew condensation on the inside of the vehicle compartment 10 or the like due to the low temperature of the fuel gas supply pipe 40 at the time of fuel filling. further,
Condensed water W generated from the fuel gas supply pipe 40 is sucked by the gas release tube 50 and discharged to the outside of the vehicle from the lower end open to the outside air near the gas filling port 8. The lower end of the gas release tube 50 can discharge not only the dew water W but also the leak gas G.

The cylindrical sealing member 60 is fastened by a clip 5 or the like with a stopper 5, and the fastening portion is blocked as shown in FIG. 5, but between the stoppers 5 is shown in FIG. With such a space, the leak gas G and the dew condensation water W can be sucked from the gas release tube 50 existing in this space and reliably discharged to the outside of the vehicle compartment 10.

[0015]

As described above, according to the present invention, the fuel gas supply pipe and the gas release pipe can be fixed without forming a seam in the cylindrical sealing member. Even if the gas leaks, the leaked gas does not enter the cabin, and the leaked gas flows along the fuel gas supply pipe and quickly out of the vehicle cabin through the gas release tube covered with the cylindrical seal member together with the fuel gas supply pipe. To ensure safety. In addition, the heat-insulating action of the cylindrical seal member prevents condensation in the vehicle interior due to the low temperature of the fuel gas supply pipe during fuel filling, and condensed water generated from the fuel gas supply pipe goes out of the vehicle interior through the gas release tube. There is an advantage that can be discharged.

[Brief description of the drawings]

FIG. 1 is a side view of a bus vehicle schematically showing a piping structure of the present invention.

FIG. 2 is a rear view of a bus vehicle schematically showing the piping structure of the present invention.

FIG. 3 is a sectional view taken along an arrow A of FIG.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view taken along line CC of FIG. 3;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fuel gas container 2 mounting member 3 roof 4 exterior pipe 4 a interior pipe 5 stopper 7 auxiliary equipment 8 gas filling port 9 engine 10 interior room 11 bus vehicle 12 engine room 40 fuel gas supply pipe 50 degassing tube 50 a small hole 60 cylindrical seal member

Claims (1)

[Claims] 1. An automobile in which a fuel gas container is installed on a roof, and a fuel gas supply pipe is connected between the fuel gas container and an engine in an engine room from the roof through a vehicle compartment. Between the fuel gas supply pipe between and through a gas-tight venting tube that can communicate with the outside air, through the cylindrical sealing member of the elastic material,
A fuel gas piping structure for an automobile, wherein the tubular sealing member is fastened and fixed to a vehicle body with a stopper.