Fuel evaporation configuration structure of straddle type motorized cart

Abstract

The invention discloses a fuel evaporation configuration structure of a straddle type motorized cart. The fuel evaporation configuration structure of the straddle type motorized cart comprises a head tube, a main cart frame, and a back cart frame, a concave-shaped straddle part which facilitates riders to stride a cart body in one foot is formed between the main cart frame and the back cart frame, a fuel tank which is at least partly overlapped with the concave-shaped straddle part and a tool box on the back position of the fuel box are arranged on the back cart frame, the fuel tank and the tool box are arranged below a cart seat, an oil-gas separator on the fuel tank is connected with a carbon tank through an absorption tube, the back cart frame is a single beam which an independent cart frame stretches to a back top position, the carbon tank is arranged inside space between the fuel tank and the tool box of the cart body, the carbon tank is vertically arranged, and at least partial carbon tank is overlapped with the fuel tank when the cart is overlooked. The fuel evaporation configuration structure of the straddle type motorized cart ensures capacity of the fuel tank and the tool box and compact cart body. Additional protective components are unnecessary due to the fact that the carbon tank is protected by the fuel tank, the tool box, and a cart body cover.

Description

technical field [0001] The invention relates to the optimization of the fuel evaporation arrangement structure of a straddle type motor two-wheel vehicle. Background technique [0002] Existing motor two-wheeled vehicle is all provided with fuel evaporation system usually in order to introduce fuel vapor into engine combustion and prevent fuel vapor from volatilizing into the atmosphere. At present, for models with fuel tank and tool box arranged under the seat, the conventional layout of the fuel evaporation system is to arrange the carbon canister on the side of the fuel tank or the rear of the fuel tank and tool box. The impact of the vehicle is relatively large, especially for the double-tube rear frame. Due to the large distance between the left and right pair of seat side bars (that is, the left and right rear frame) along the vehicle width direction, this leads to the The space on the side of the fuel tank on the outside of the side bar along the width direction of t...

AI Technical Summary

Problems solved by technology

At present, for models with fuel tank and tool box arranged under the seat, the conventional layout of the fuel evaporation system is to arrange the carbon canister on the side of the fuel tank or the rear of the fuel tank and tool box. The impact of the vehicle is relatively large, especially for the double-tube rear frame. Due to the large distance between the left and right pair of seat side bars (that is, the left and right rear frame) along the vehicle width direction, this leads to the The space on the side of the fuel tank on the outside of the side bar along the width direction of the vehicle is narrow. If the carbon canister is placed on the side of the fuel tank, considering the need to avoid the interference of the side bar of the seat, the only way to set aside the carbon canister is to set the fuel tank on the fuel tank. The concave part of the tank or the volume of the tool box is greatly reduced to reserve the space for the canister installation, which will inevitably lead to problems such as smaller fuel tank volume, insufficient fuel tank capacity, or narrow space in the tool box. If the original fuel tank and The structure of the tool box and the installation of the canister along the width direction of the car will inevitably increase the width of the car body, affect the compactness of the locomotive, and ultimately affect the riding comfort

In addition, if the canister is installed at the rear of the fuel tank and the tool box, the length of the discharge pipe connecting the canister and the carburetor will be increased, thereby affecting the desorption capacity of the fuel vapor in the canister; at the same time, there are two For locomotives with a secondary air filter, in order to avoid the abnormal sound of the secondary air valve when inhaling fresh air, the structure, shape and size of the secondary air filter are fixed and cannot be changed at will. The carbon canister is arranged in the fuel tank and the tool box When the rear part of the locomotive is satisfied, the layout of the secondary air filter and the layout of the corresponding pipelines will become complicated and chaotic, which may prolong the length of the corresponding pipelines on the secondary air filter. The normal operation of the secondary air filter has a certain influence

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