JPS6316856Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to an evaporative hose mounting structure that connects a carburetor or an air cleaner upstream thereof to a fuel vapor reservoir using a chassis frame in a vehicle engine.

[Conventional technology]

As a measure against evaporation of vehicle engines, for example, in Japanese Patent Publication No. 51-7764 by the present applicant,
It has been proposed to utilize the chassis frame of the vehicle body as a fuel vapor reservoir, in which an air cleaner upstream of the carburetor is connected to the frame via a communicating pipe.

[Problem that the invention attempts to solve]

Incidentally, fuel vapor in the carburetor is generated in the float chamber and leaks through the fuel passage or air vent pipe, and therefore the float chamber can discharge fuel vapor more effectively than the air cleaner. In addition, in the prior art described above, the air cleaner is also used to collect fuel vapor, but in this case, when the engine is restarted, the fuel captured by the air cleaner is also sucked in, resulting in an excessively rich air-fuel ratio and poor restartability. Therefore, it is desirable to install an evaporative filter for collecting fuel vapor separately from the air cleaner. In view of these circumstances, the present invention has been developed to effectively discharge the fuel vapor generated in the carburetor to the chassis frame side, to effectively collect it with an air cleaner and a separate evaporative filter, and to also effectively discharge the fuel vapor generated in the carburetor to the chassis frame side, and to effectively collect the fuel vapor with an air cleaner and a separate evaporative filter. It is an object of the present invention to provide an evaporative hose mounting structure that makes the road structure simple and vibration-resistant.

[Means to solve the problem]

In order to achieve this purpose, the present invention installs an evaporative filter near the cross member connection part of the side member of the chassis frame that stores fuel vapor, and inserts the first connection part of the three-way rubber pipe into the pipe of the side member. While inserting it into the hole,
Fit the connecting part to the outlet side of the evaporative filter,
Further, the third connecting portion is connected to the air cleaner, and the inlet side of the evaporative filter is connected to the float chamber side of the carburetor by pipes. In addition, in the method disclosed in Japanese Utility Model Publication No. 56-49829, an air breather pipe provided on the top surface of the fuel tank is connected to a side member for storing fuel vapor by a connecting pipe, and a canister, an intake pipe, and a purge pipe are connected to the side member in sequence. The structure is different from that of the present invention regarding the attachment of an Evaho hose for storing fuel vapor from the float chamber and air cleaner in the frame.

【Example】

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. In FIGS. 1 to 3,
Reference numeral 1 designates one of the left and right side members of the chassis frame that extends in the longitudinal direction of the vehicle body, and this side member 1 is formed into a rectangular tube shape and closes the rear end where the engine is mounted. By that,
It has a large capacity fuel vapor reservoir inside. and such side member 1
A cross member 4 is constructed by a bracket 3 between the cross member 2 and the other left and right side member 2, and an engine 5 is mounted thereon. Therefore, in such a configuration, the evaporative filter 6 is installed obliquely close to the joint of the cross member 4 inside the side member 1 that stores the fuel vapor, and the evaporative filter 6 is welded to the evaporative filter 6 here. By fixing the bracket 7 to the cross member mounting bracket 3 with a fastener 8, the evaporative filter 6 is firmly supported in a cantilevered manner. Further, a pipe insertion hole 9 is bored in communication with the side member side wall 1a near the evaporative filter 6 and the bracket 3, and the first connecting portion 10a of the three-way rubber pipe 10 is press-fitted into this hole 9. It is inserted airtight, and its second connecting portion 10b is directly fitted to the outlet side of the evaporative filter 6. The inlet side of the evaporative filter 6 is the rubber pipe 1.
1 to the float chamber side of the carburetor 12 of the engine 5, and an air cleaner 13 on the upstream side of the carburetor 12 is connected to the third connecting portion 10c of the three-way rubber pipe 10 by a rubber pipe 14. In this way, the evaporative filter 6 installed close to the side member 1 is relayed to the carburetor 12.
The pipe arrangement connecting the float chamber side and the air cleaner 13 to the side member 1 is done without any special support, especially the evaporative filter 6.
Accordingly, the three-way rubber pipe 10 has its first connection part 1
0a is inserted into the hole 9 on the side member 1 side and held in a connected state. With this structure, when fuel vapor is generated in the float chamber side of the carburetor 12 when the engine is stopped at high temperatures, it is directly discharged through the rubber pipe 11 and then collected by the evaporative filter 6. 6 or which leaks to the side of the air cleaner 13 is stored in the side member 1. After the engine is restarted, the fuel vapor inside the side member 1 is transferred to the pipe 10,
14 and air cleaner 13, and is used for combustion. Furthermore, when the float chamber of the carburetor 12 is made to have a negative pressure by the air vent pipe, the evaporative filter 6 is purged and it becomes possible to collect it again.

[Effect of the idea]

As is clear from the above description, according to the present invention, fuel vapor is directly discharged from the float chamber side of the carburetor and is collected by the evaporative filter 6, so that evaporation countermeasures can be effectively taken. In addition, pipes that connect the float chamber side of the carburetor 12, the air cleaner 13, and the side members 1 through the evaporative filter 6 attached to the side member 1 can be connected without being specially supported. It will be done with certainty. Furthermore, evaporative filter 6
is attached to the side member 1 close to the connection part of the cross member 4, and the three-way rubber pipe 10
Since the first connecting portion of the evaporative filter 6 and the side member 1 are inserted into the side member 1 side, the connection between the evaporative filter 6 and the side member 1 will not be damaged due to vibration or the like.

[Brief explanation of drawings]

FIG. 1 is an overall plan view showing an embodiment of the present invention, FIG. 2 is a plan view showing a portion A in FIG. 1 in detail with a partial cross section, and FIG. 3 is a side view of the same. 1, 2...Side member, 1a...Side wall, 3,
7...Bracket, 4...Cross member, 5...
Engine, 6... Evaporative filter, 8... Fastener, 9... Pipe insertion hole, 10... Three-way rubber pipe, 10a, 10b, 10c... Connection part, 1
1, 14... Rubber pipe, 12... Carburetor, 13
...Air cleaner.

Claims (1)

[Scope of utility model registration request] An evaporative filter is installed close to the cross member connection part of the side member of the chassis frame that stores fuel vapor, and the first connection part of the three-way rubber pipe is inserted into the pipe insertion hole of the side member, and the second connection part is inserted into the pipe insertion hole of the side member. into the outlet side of the evaporative filter, and connect the third connection part to the air cleaner,
An evaporative hose mounting structure characterized in that the inlet side of the evaporative filter is connected to the float chamber side of the carburetor by pipes.