JPS5911832Y2 - Motorcycle evaporative gas recovery device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a motorcycle evaporative gas recovery device.

In an evaporative gas recovery device from a breather pipe connected to a fuel tank, a separator for gas-liquid separation is provided in the middle of the breather pipe on the upstream side of a canister for adsorbing evaporative gas. The separator has been mounted above or below the fuel tank and even housed in the handle pipe, without much technical attention being paid to its mounting position.

Those installed above the fuel tank have the disadvantage that they are heated by the engine and reflected light from the fuel tank, reducing the efficiency of liquefying gasoline vapor, while those installed below the tank are heated by the engine. However, it has the same drawbacks as above, as well as the need for a pump to return the liquefied gasoline to the tank.

In addition, those that are housed inside the handle pipe,
The handle itself is sometimes replaced depending on the user's preference, which is undesirable, and at the same time, there is a drawback that the handle can be damaged in the event of a fall and must be replaced.

Therefore, the inventor of the present invention conducted a technical study on the mounting position of the separator, and found that the center of the handle was the optimal position that would not be affected by the heat of the engine, would not be damaged in the event of a fall, and would be able to deal with glare from the tank. We focused on the upper part of the upper bracket that will be attached.

The present invention was devised from this perspective.

Next, embodiments of the present invention will be described with reference to the drawings.

1 is a front fork stay, 2 is a front fork, and 3 is an upper bracket, to which the center portion of a handle 4 is attached.

Reference numeral 5 denotes a separator, and two mounting pieces 5a are provided at the front and one at the rear of the bottom of the separator, and the front mounting piece 5a is connected to a bracket 8 with an L-shaped cross section by a bolt 6 and a nut 7. The bracket 17 is attached to the front end of a long bracket 17 with its rear end extending downward, and the rear part is attached to a mounting piece 17a provided near the rear end of the bracket 17 with bolts 6 and nuts 7.

The bracket 17 has a bolt 20 and a nut 2 at the rear end.
1 is fixed to an upper frame 18 extending rearward from the front Hawk stay 1 via a bracket 19.

With this structure, the separator 5 is fixed to the upper frame 18, which is a fixed member relative to the handle 4.
Even if the handle 4 turns for steering, it does not turn at the same time.

The position of the separator 5 installed in this manner is higher than the oil level 11 when the fuel tank 10 is full (when filled with a specified amount).

Reference numeral 12 denotes a breather main pipe that is connected to the rear part of the bottom of the separator 5 and communicates with the oil surface 11 in the tank 10 via the liquid leakage prevention valve 13. This is also an air passage, and the fuel liquefied by the separator 5 It is also a return pipe.

In this case, the separator 5 is connected to the tank oil level 11 as described above.
Since it is higher, the liquefied fuel will naturally return smoothly.

Note that the breather main pipe 12 is preferably a flexible pipe.

14 is also connected to the front side of the separator 5 and communicates with a canister (not shown); 15 is the separator 5; both breather tubes 12. A separator cover that covers a part of the separator 14, and the mounting piece 5a of the separator 5 is attached to the bottom surface of the separator cover.
A mounting piece 15a is provided at a location corresponding to the mounting piece 15a, and this mounting piece 15a is attached to the bracket 8 and the mounting piece 17a together with the mounting piece 5a of the separator 5, and is attached to the bracket 8 and the mounting piece 17a through the bracket 8. bracket 1
It is fixed at 7.

In this case, it is preferable to provide an appropriate distance between the separator 5 and the separator 5.

This is to prevent the heat of the cover 15 heated by direct sunlight from affecting the separator 5 as much as possible, and also to cool the separator 5 by taking in air from the front when driving and creating an air flow using wind pressure. .

Further, if necessary, the inner surface of the cover 15 may be lined with a heat insulating material.

16 is a cap equipped with a negative pressure valve that operates when the tank becomes negative pressure and the engine malfunctions, and a safety valve that operates when the leakage prevention valve 13 is blocked and the tank internal pressure becomes dangerous due to a fall, etc. be.

Note that these valves are not limited to this cap 16; for example, a safety valve may be installed on the top of the tank, between the tank and the separator, or between the tank and the canister. In the embodiments described above, the separator 5 is attached to an immovable member. Although it is attached to the upper frame 18, which is a member on the vehicle body side, it may also be fixed to the fuel tank 10, which is also a stationary member.

As is clear from the above, the evaporative gas recovery device of the present invention is
Since the separator 5 is disposed above the upper bracket 3, it is not affected by heat from the engine, tank, etc., and is sufficiently cooled by the wind during driving.

Furthermore, even if the device falls down, the left and right handles 4 protect it from direct impact, so it will not be damaged.

Furthermore, since the separator 5 is installed at a position higher than the oil level 11 of the fuel tank 10 when it is full, the liquefied fuel can be returned smoothly.

The separator 5 is not fixed to the steering wheel 4, which rotates for steering, but to a member (such as the upper frame 18) on the vehicle body side that is a stationary member.
It does not cooperate with the rotation of the handle 4, so that the breather tubes 12, 14 are not adversely affected (damage or coming off) by repeated bending.

[Brief explanation of drawings]

The figure is a side view of the first embodiment of the device of the present invention. 3...Upper bracket, 4...Handle, 5...Separator, 8, 17, 1
9... Bracket, 10... Fuel tank, 11... Oil level, {12... Breather source pipe, 14... Breather tip tube} (breather tube), 18... Upper frame.

Claims (3)

[Scope of utility model registration request] (1) In a motorcycle evaporative gas recovery device in which a separator for gas-liquid separation is connected in the middle of a breather pipe connected to a fuel tank, the separator is installed above the upper bracket part to which the handlebar of the motorcycle is attached, and A motorcycle evaporative gas recovery system, characterized in that the separator is disposed at a higher position than the oil level when the fuel tank is filled with a specified amount, and the separator is fixed to a member on the vehicle body side that is an immovable member with respect to the handlebar. Device. (2) The motorcycle evaporative gas recovery device according to claim 1, wherein the separator is fixed via a bracket to an upper frame extending rearward from the front Hawkstay. (3) The motorcycle evaporative gas recovery device according to claim 1, wherein the separator is fixed to the fuel tank via a bracket.