JP3429085B2 - Piping fixed structure in fuel tank seal - Google Patents

Description

Detailed Description of the Invention

[0001]

This invention relates to compressed natural gas (CN).
G) and the like relates to a structure for fixing a pipe in a leak prevention seal in a pipe around a fuel tank that stores a compressed fuel gas.

[0002]

2. Description of the Related Art A pipe around a fuel tank is usually covered with a cylindrical seal member, and conventionally, a structure shown in FIG. 15 was used to fix the pipe in the seal member. Figure 1
5 is a cross-sectional view of a main part, in which the pipe 01 is covered with a tubular seal member 02 for preventing leakage, and a special locking tool 04 is used to fix the pipe 01 to the vehicle body 03.

That is, the locking tool 04 comprises a holding part 04a for holding the pipe 01 and a clip part 04b protruding from the flat bottom surface of the holding part 04a, and the holding tool holding the pipe 01 inside the seal member 02. 04 makes the projecting clip part 04b penetrate the seal member 02, is further inserted into a hole formed in the vehicle body 03, and the claw 04c at the tip of the clip part 04b is locked and fixed to the back side of the vehicle body 03. It has a structure.

The locking tool 04 is the bottom surface of the holding section 04a and the clip section.
The seal member 02 is sandwiched by the claw 04c of 04b and sandwiched by the vehicle body 03, and the pipe 01 is fixed to the sandwiching portion 04a in the seal member 02 of the locking tool 04.

[0005]

As described above, in the conventional pipe fixing structure, the seal member 02 is penetrated by the clip portion 04b of the locking tool 04, so that a hole is provided in the seal member 02 and the airtightness is impaired. There was a fear. The present invention has been made in view of the above point, and an object thereof is to provide an in-seal pipe fixing structure capable of easily fixing a pipe in the seal member without providing a hole in the seal member.

[0006]

To achieve SUMMARY and operation for solving the above objects, the present invention is in the vehicle fuel tank to store pressurized fuel gas, covering the pipes around the fuel tank by a plurality of cylindrical sealing member, the A fuel in which a pipe is locked to a locking portion formed to bulge on the inner surface of a joint member that joins seal members together, and in this state, the pipe is collectively mounted and the joint member is fixed to a member on the vehicle body side. The structure for fixing the piping inside the tank seal was adopted.

Since the joint member for joining the seal members is used and the pipe is locked by the locking portion inside the joint member and the joint member itself is fixed to the member on the vehicle body side, it is not necessary to provide a hole in the seal member. It is easy to fix the joint member to the vehicle body side and the workability is excellent.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in FIGS. 1 to 14 will be described below. The four-wheeled motor vehicle according to the present embodiment is a vehicle that uses methane gas as a main component and uses natural gas having a smaller specific gravity than air as a fuel, and the natural gas is approximately 200
It is equipped with a fuel cylinder that is a compressed fuel tank that can be compressed and filled at a pressure of kg / cm ² .

FIG. 1 is an explanatory view showing the positions of the fuel cylinders on the side surface of the rear half portion of the present four-wheeled motor vehicle 1. The two large and small fuel cylinders 3 and 4 are supported by a support frame 5 and are attached to the rear seat 6. It is arranged between the left and right rear wheel houses on a rear floor 25 supported by a rear side frame 24 at the rear side, and the upper portion thereof corresponds to the rear window 7, and the upper portion of the fuel cylinder 3 and the rear trunk chamber 8 are connected to the rear bulkhead 26, 27 partitions.

FIG. 2 shows a support frame 5 on which fuel cylinders 3 and 4 are mounted.
In the structure of the support frame 5, the left and right side support frames 10, 10 are erected so as to face each other, and a plurality of cross members 11 are arranged between the side support frames 10, 10. Are connected together to form an integral support frame 5.

The fuel cylinders 3 and 4 are rubber belts 1 respectively.
Bands 16 and 19 with brackets are wound around 5 and 18, and the brackets 16a and 19a of the bands 16 and 19 with brackets are fixed to the cross member 11 and supported between the pair of front and rear cross members 11. There is.

Next, pipes and a leak preventive seal are provided around the fuel cylinders 3 and 4, and a configuration diagram of the pipe and the leak preventive seal is shown in FIG. 3, and an exploded perspective view of the leak preventive seal is shown in FIG. Show.

Normally closed normally closed solenoid valves 32 and 33 are integrally attached to the left ends (right ends in FIGS. 2 and 3) of the fuel cylinders 3 and 4, respectively. , Relief valves 34 and 35 are integrally mounted, and normally closed solenoid valves 32 and 33 are closed when not energized and opened when energized. Further fuel cylinders 3, 4
When the internal pressure rises above a predetermined set pressure, the relief valves 34, 35 are opened, and the filling fuel in the fuel cylinders 3, 4 is discharged.

A seal box 36 having a two-part structure is disposed behind the fuel tank 4 adjacent to the fuel cylinders 3 and 4, and a filter for filtering natural gas and a fuel are provided in the seal box 36. Sensors that detect the pressure and temperature inside the cylinders 3, 4 and the equipment necessary for filling the fuel cylinders 3 and 4 with compressed natural gas and supplying natural gas from the fuel cylinders 3 and 4 to the internal combustion engine. A built-in compressed natural gas supply auxiliary unit 37 is provided.

At both ends of the fuel cylinders 3, 4, valve covers 38, 39, 40, 41 for covering the normally closed solenoid valves 32, 33 and the relief valves 34, 35, respectively.
Is airtightly mounted, and the opening 38a of the valve cover 38 and the opening 42a of the seal boot branch joint 42 are connected to each other by a seal boot 43. The opening 39a of the valve cover 39 and the opening 36a of the seal box 36 are connected to each other. Are connected to each other by seal boots 44.

Moreover, the opening 40a of the valve cover 40, the opening 41a of the valve cover 41, and the seal boot branch joint 47 are used.
The openings 47a and 47b of the seal boot 45 and 46 are communicated with each other, and the opening 47c of the branch joint 47 of the seal boot and the opening 36b of the seal box 36 are communicatively connected with each other by the seal boot 48. The opening 36c and the opening 42b of the seal boot branch joint 42 are mutually connected by a seal boot 49. Further, the opening joint member 31 is fitted in the opening 25f of the rear floor 25, and the opening 42c of the seal boot branch joint 42 and the opening joint member 31 are connected to each other by the seal boot 51.

Both ends of the compressed natural gas filling supply pipe 52 penetrating the seal boot 43, the seal boot branch joint 42 and the seal boot 49 are connected to the normally closed solenoid valve 32 in the valve cover 38 and the compressed natural gas in the seal box 36. Both ends of the compressed natural gas filling supply pipe 53, which is connected to the auxiliary supply unit 37 and penetrates the seal boot 44, have a normally closed solenoid valve 33 in the valve cover 39 and a compressed natural gas supply in the seal box 36. Each of them is connected to the accessory unit 37.

Further, the relief pipe 54 penetrating the seal boot 45, the seal boot branch joint 47 and the seal boot 48.
Has one end connected to the relief valve 34 in the valve cover 40, and one end of the relief pipe 55 penetrating the seal boot 46, the seal boot branch joint 47 and the seal boot 48 is connected to the relief valve 35 in the valve cover 41. At the same time, the other ends of the relief pipes 54, 55 are
Connected to one end of the relief pipe 56 of the book,
Reference numeral 56 is connected to a relief pipe 71 that penetrates the seal boot 49 and the seal boot branch joint 42, has one end exposed to the outside of the vehicle by a connector 61 in the seal boot 51, and penetrates through the opening joint member 31.

A compressed natural gas supply pipe 58 and a compressed natural gas supply pipe 59 extending from the compressed natural gas supply auxiliary unit 37.
Is a seal boot 49 and a seal boot branch joint 42.
The compressed natural gas filling pipe 72 and the compressed natural gas supply pipe 73, which have penetrated through, are connected by the connectors 62 and 63. The compressed natural gas filling pipe 72 extends upward along the trunk side wall 80, penetrates the filler recess 81 and is exposed in the filler wall 82, and the compressed natural gas filling valve 83 is provided at the other end of the compressed natural gas filling pipe 72. The compressed natural gas supply pipe 73, which is attached to and extends downward from the opening joint member 31, extends to the front of the vehicle body along the lower surface of the rear floor 25 and is mounted on the front portion of the automobile 1 (not shown). It is connected to the internal combustion engine.

In addition, the valve covers 38, 39, 40, 41
In the tube connection parts 38b, 39b, 40b, 41b of the leaking natural gas discharge tubes 91, 92, 93
One end of 94 is connected to leak natural gas exhaust tube 91, 9
2 and 93 are connected to three-way opening pipe fittings 95, 96 and 97 respectively, and the leaking natural gas discharge tube 94 is connected to the other opening of the pipe fitting 97, and the pipe fitting 97 and the pipe fitting 96 are leaking natural gas discharge. The tubes 98 are connected to each other, and the pipe joint 95 and the pipe joint 96 are connected to each other via the leaking natural gas discharge tube 99 so that the valve covers 38, 39, 40 and 41 are all in communication with each other. Leakage natural gas exhaust tube 10 connected to
0 extends into the filler recess 81, and its tip is the filler opening.
It is connected to 101 via a pipe joint 102.

An upper end of the drainage pipe 105 is connected to the lower opening 36d of the seal box 36, the drainage pipe 105 penetrates the rear floor 25, and a lower end of the drainage pipe 51 is exposed outside the vehicle body. The water condensed in the boots 43, 44, 45, 46, 48, 49 and the seal box 36 is drainage pipe 10
It is designed to be discharged to the outside of the vehicle via 5. As shown in FIG. 4, a water drainage pipe 106 may be provided by branching from the leaked natural gas discharge tube 100.

FIG. 5 shows a state in which the pipes and the leakproof seals have been installed around the fuel cylinders 3 and 4,
In this state, they are collectively mounted at a predetermined position on the rear floor 25. The seal boot 51 is connected to the opening 25f of the rear floor 25 on the vehicle body side by an opening joint member 31,
On the fuel cylinder side, the ends of the relief pipe 56, the compressed natural gas filling pipe 58, and the compressed natural gas supply pipe 59 are exposed outside from the seal boot branch joint 42. Further, the tip of the leaked natural gas discharge tube 100 and the tip of the drainage pipe 105 are also in a free state.

Further, although the seal boots 45, 46, 48 connected by the seal boot branch joint 47 are unstable and in a state of easy movement, the seal boots 43, 49 connected by the seal boot branch joint 42 are seal boot branch joints. 42 has a flange portion 42d (see FIG. 4), and as shown in FIG. 5, the flange portion 42d is firmly fixed to the peripheral edge of the circular hole 10c of the one side support frame 10 of the support frame 5 by being firmly fixed. Has been done.

When the support frame 5 to which the fuel cylinders 3 and 4 are attached is mounted and fixed at a predetermined position on the rear floor 25 shown in FIG. 1, the seal boots 45 and 4 which are not fixed are fixed.
Reference numerals 6 and 48 fix the seal boot branch joint 47, which is the connecting portion, to the rear bulkhead 27 that is integrally erected on the vehicle body.

The seal boot branch joint 47 is shown in FIGS.
Both ends of the straight cylinder have openings 47a, as shown in FIG.
47c, and the end of the cylinder branched from the same is an opening 47b.
The rectangular flange 47d projects from the straight cylinder. The brat 47d is provided with two mounting holes 47e. The pipe locking portion 47 faces the inner peripheral surface of the opening 47c.
f and 47f are formed to project, and the pipe locking portion 47f is formed with a pair of locking claws so as to sandwich the pipe.

2 which penetrates through the seal boot branch joint 47
The relief pipes 54, 55 of the book are sandwiched between the pipe locking portions 47f, 47f and fixed to the seal boot branch joint 47. Figure 8
As shown in FIG.
Seal boots 45, 46, and 48 are joined to b and 47c, respectively. As shown in FIG. 9, the rear bulkhead 27 is provided with a stay 111 having a proximal end screwed by a bolt / nut 110, and a flange 47 of the seal boot branch joint 47.
The seal boot branch joint 47 is fixed to the vehicle body by fixing d to the tip of the stay 111 with a bolt and nut 112.

In this way, the relief pipe 5 in the seal
Since the seals 4 and 55 are fixed to the vehicle body side by using the seal boot branch joint 47, the relief pipes 54 and 55 can be reliably fixed to the vehicle body side without providing through holes in the seal boot or the like. Since the seal boot branch joint 47, which is a commonly used joint member, is used, no special dedicated fixing member is required. The seal boot branch joint 42 fixed to the support frame 5 also has a pipe locking portion inside, and has a compressed natural gas filling supply pipe 52, a relief pipe 56, a compressed natural gas filling pipe 58, and a compressed natural gas. The supply pipe 59 is locked.

A relief pipe 71, a compressed natural gas filling pipe 72, which is connected to the relief pipe 56 on the fuel cylinder side, a compressed natural gas filling pipe 58, and a compressed natural gas supply pipe 59 via connectors 61, 62 and 63, a compression The natural gas supply pipe 73 is fixed to the rear floor 25 by the opening joint member 31. The opening joint member 31, as shown in FIGS.
A substantially triangular flange 31b is provided on one opening edge of the cylindrical portion 31a.
Are formed, and the mounting holes 31 are formed at the three corners of the flange 31b.
c is provided.

Three pipe engaging portions 31d are formed inside the cylindrical portion 31a on the side having the flange 31b, and the pipe engaging portions 31d are formed with circular holes 31e oriented in the cylinder axial direction. The relief pipe 71, the compressed natural gas filling pipe 72, and the compressed natural gas supply pipe 73 are locked through the circular holes 31e of the three pipe locking portions 31d, and the relief is provided for the opening joint member 31. The pipe 71, the compressed natural gas filling pipe 72, and the compressed natural gas supply pipe 73 are fixed.

The opening joint member 31 itself is shown in FIG.
As shown in FIG. 4, the cylindrical portion 31a is provided in the opening 25f of the rear floor 25.
From the lower side and insert the flange 31 through the seal member 120.
b is applied to the peripheral edge of the opening 25f, penetrates the circular hole 31e, is screwed and tightened with bolts and nuts 121, and is fixed to the rear floor 25. In this way, since the relief pipe 71, the compressed natural gas filling pipe 72, and the compressed natural gas supply pipe 73 in the seal are fixed to the vehicle body side by using the opening joint member 31, there is no need to provide a through hole in the seal boot or the like. The relief pipe 71, the compressed natural gas filling pipe 72, and the compressed natural gas supply pipe 73 can be reliably fixed to the vehicle body side.

[0031]

According to the present invention, the joint member at the end of the seal member is used, the pipe is locked by the locking portion inside the joint member, and the joint member itself is fixed to the member on the vehicle body side. The pipe can be fixed to the vehicle body without the provision of the seal, and the sealing property can be secured. It is easy to fix the joint member to the vehicle body side and the workability is excellent. Since a commonly used joint member is used, a special dedicated fixing member is not required and the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a side surface of a rear half portion of an automobile according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state where a fuel cylinder is attached to a support frame.

FIG. 3 is a configuration diagram of a fuel cylinder pipe and a leak prevention seal.

FIG. 4 is an exploded perspective view of a leak prevention seal around a fuel cylinder.

FIG. 5 is a perspective view of the fuel cylinder and the support frame in a state where the pipes around the fuel cylinder and the leak prevention seal have been attached.

FIG. 6 is a side view showing a partial cross section of the seal boot branch joint.

FIG. 7 is a view on arrow VII in FIG.

FIG. 8 is a perspective view showing a usage state of the seal boot branch joint.

FIG. 9 is a cross-sectional view showing a fixed state of the seal boot branch joint.

FIG. 10 is a plan view of an opening joint member.

FIG. 11 is a side view of the same.

FIG. 12 is a sectional view of the same.

FIG. 13 is a perspective view showing a usage state of the opening joint member.

FIG. 14 is a cross-sectional view showing a fixed state of the opening joint member.

FIG. 15 is a cross-sectional view showing a conventional pipe fixing structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Automobile, 3, 4 ... Fuel cylinder, 5 ... Support frame, 6 ... Rear seat, 7 ... Rear window, 8 ... Trunk chamber, 10 ... Side support frame, 11 ... Cross member, 15
… Rubber belt, 16… Band with bracket, 18… Rubber belt, 19… Band with bracket, 24… Rear side frame, 25… Rear floor, 26, 27… Rear bulkhead, 31
… Opening joint member, 32, 33… Normally closed solenoid valve, 34, 35… Relief valve, 36… Seal box, 37… Compressed natural gas supply auxiliary unit, 38, 3
9, 40, 41 ... Valve cover, 42 ... Seal boot branch joint, 43, 44, 45, 46 ... Seal boot, 47 ... Seal boot branch joint, 48, 49 ... Seal boot, 51 ... Seal boot,
52, 53 ... Compressed natural gas filling supply pipe, 54, 55, 56 ... Relief pipe, 57 ... Pipe fitting, 58 ... Compressed natural gas filling pipe, 59
… Compressed natural gas supply piping, 61, 62, 63… Connector, 71
… Relief pipe, 72… Compressed natural gas filling pipe, 73… Compressed natural gas supply pipe, 80… Trunk side wall, 81… Filler recess, 82
… Filler wall, 83… Compressed natural gas valve, 91, 92, 93,
94 ... Leakage natural gas exhaust tube, 95, 96, 97 ... Pipe fittings,
98,99,100… Leakage natural gas discharge tube, 101… Filler opening, 102… Fittings, 105,106… Drainage piping, 11
0 ... Bolt / nut, 111 ... Stay, 112 ... Bolt / nut, 120 ... Seal member, 121 ... Bolt / nut.

Continuation of the front page (56) Reference JP-A-64-35193 (JP, A) Actually open 2-125421 (JP, U) Actually open 61-24320 (JP, U) Actually open 53-136613 (JP , U) Actual development Sho 51-82231 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60K 15/03

Claims (2)

(57) [Claims] 1. An in-vehicle fuel tank for pressurizing and storing fuel gas, wherein pipes around the fuel tank are covered with a plurality of tubular seal members,
A pipe is locked to a locking portion formed to bulge on an inner surface of a joint member for joining the seal members, and in this state, the pipe is collectively mounted and the joint member is fixed to a member on the vehicle body side. A structure for fixing the piping inside the seal of the fuel tank. 2. The in-seal pipe fixing structure for a fuel tank according to claim 1, wherein a fixing flange is projectingly provided on the joint member, and the flange is fixed to a vehicle body side member.