Carburetor bowl spacers with integrated venturi insert for raising and repositioning carburetor covers on classic scooters, especially Vespa vehicles.

Abstract

Carburetor bowl spacer for a carburetor arranged in a carburetor bowl of a classic motor scooter, in particular a Vespa motor scooter, with a carburetor bowl cover attached to the carburetor bowl by means of screws, characterized in that the carburetor bowl spacer • is designed as an intermediate part arranged between the carburetor bowl and the carburetor bowl cover, • has a circumferential frame that follows the predetermined contour of the carburetor bowl and fits precisely on the upper edge of the carburetor bowl, • includes a Venturi funnel integrated into the frame, which is positioned in a flow-optimized manner above and covers an intake opening of the carburetor, • has two through holes for receiving fastening screws that interact with threads in the carburetor bowl, so that the carburetor bowl cover is raised and / or offset relative to the carburetor bowl by means of the carburetor bowl spacer, an increased air volume is provided inside the carburetor bowl and the intake airflow via the Venturi funnel into the carburetor is improved.

Description

Technical field

[0001] The invention relates to the carburetor technology of classic motor scooters and serves to optimize the intake airflow for increasing performance while simultaneously improving access to the carburetor jets.

[0002] It therefore lies in the technical field of intake and air guide components for carburetors, especially in closed carburetor bowls of Vespa engines. State of the art

[0003] In production vehicles with SI carburetors, the carburetor is located in a carburetor bowl, the intake opening of which ends bluntly and is closed with a cover using two M5 screws, resulting in only a comparatively small volume of air being available.

[0004] Venturi funnels are available from aftermarket suppliers; these are screwed directly onto the SI carburetor and are intended to improve the intake airflow. However, they have the following disadvantages: • Access to the carburetor jets is made more difficult by screwed-on Venturi funnels. • There is a risk that fastening screws may come loose, enter the intake tract and reach the crankshaft, and cause engine damage. The problem underlying the invention

[0005] The object of the invention is to improve the intake air flow to the SI carburetor arranged in the carburetor housing and to increase the available air volume without introducing additional detachable connecting elements in the intake tract.

[0006] At the same time, access to the carburetor jets for engine tuning should be made easier and the available installation space in relation to the vehicle chassis should be increased. Description of the invention

[0007] The problem is solved by a carburetor bowl spacer designed as an intermediate part with an integrated Venturi funnel, which is positioned between the carburetor bowl and the carburetor bowl cover.

[0008] The device includes in particular: • A surrounding frame that fits precisely onto the geometry of the carburetor bowl or a corresponding reproduction part specified by the manufacturer and continues this geometry. • A Venturi funnel integrated into the frame, which fits precisely over the carburetor's intake opening and provides a funnel-shaped flow path with the largest possible effective area. • Two through holes for accommodating the existing M5 mounting screws of the carburetor bowl cover • A geometry that, depending on the design, raises the carburetor bowl cover and / or moves it away from the chassis to create more air volume and additional installation space.

[0009] The spacer is simply inserted between the carburetor bowl and the cover and clamped in place using M5 screws that are approximately 10 mm longer, without the need for additional fastening elements in the intake area. Advantages of the invention

[0010] The invention has the following advantages in particular: • Shaft-compatible fixing: form-fit and / or force-fit locking within the available installation space solely by clamping between the carburetor bowl and carburetor bowl cover, without additional fastening in the intake tract • Reversibility: complete disassembly without permanent changes; all original parts remain unchanged and reusable. • Modularity: quick adaptation to different geometries (e.g. different spacer heights or offset directions) by replacing the intermediate part. • Increased installation space: the spacer with offset geometry creates additional distance to the chassis, thus creating space for modified airboxes or other components. • Increased air volume: Lifting the lid increases the air volume in the carburetor bowl. • Improved flow characteristics: the integrated Venturi funnel improves the airflow into the carburetor, enabling performance optimization and an increase in engine power. • Improved usability: access to the carburetor jets is made easier by the changed position of the cover and the elimination of screwed-on venturi attachments. Brief description of the drawings Fig. 1: shows an original series carburetor bowl Fig. 2: shows the form-fitting Venturi spacer in a single view Fig. 3: shows the venturi spacer in its mounted state on the carburetor bowl Fig. Figure 4 shows a version of the Venturi spacer with offset geometry to create additional installation space for the chassis. Fig. Figure 5 shows the Venturi spacer in an embodiment as a "lower part" with a specially designed airbox serving as the carburetor bowl cover. The extension of the Venturi funnel has been integrated into the airbox (A). Detailed description of at least one embodiment

[0011] In a preferred embodiment, the device comprises: • A mounting contour that corresponds to the geometry of the original carburetor bowl or a reproduced item • A circumferential collar for precise positioning of the spacer on the carburetor bowl • A contact surface that can be operated with or without a separate seal. • Fastening by clamping between carburetor bowl and carburetor bowl cover using the existing M5 threads in the carburetor bowl and correspondingly longer screws • A height and outer contour that are dimensioned so that, when installed, there will be no collisions with original parts or the vehicle chassis, whether stationary or in motion.

[0012] The invention is not limited to a specific manufacturing process; the spacer can be manufactured using different methods and materials. Function and handling 1. Remove the carburetor bowl cover by loosening the two M5 screws. 2. Place the Venturi spacer on the carburetor bowl and align it. 3. Reattach the original cover or an alternative airbox in the same location using longer M5 screws.

[0013] When installed, the spacer increases the air volume in the carburetor bowl, directs the incoming air in a streamlined manner via the Venturi funnel into the carburetor opening, and simultaneously allows improved access to the jets. Materials and manufacturing • Suitable materials include, in particular, petrol- and oil-resistant plastics with a temperature resistance of at least 60 °C, preferably higher, as well as suitable metallic materials. • Possible manufacturing processes include machining, injection molding, thermal forming, 3D printing and other processes suitable for the respective materials. scope • The primary area of ​​application is the intake area of ​​carburetors in closed carburetor bowls of classic motor scooters, especially of the Vespa brand. • The invention is transferable to identical or similar models and makes in which the carburetor is located in a housing and is closed by means of a cover.

Claims

[1] Carburetor bowl spacer for a carburetor arranged in a carburetor bowl of a classic motor scooter, in particular a Vespa motor scooter, with a carburetor bowl cover attached to the carburetor bowl by means of screws, characterized by that the carburetor bowl spacer • is designed as an intermediate part arranged between the carburetor bowl and the carburetor bowl cover, • has a circumferential frame that follows the predetermined contour of the carburetor bowl and fits precisely on the upper edge of the carburetor bowl, • includes a Venturi funnel integrated into the frame, which is positioned in a flow-optimized manner above and covers an intake opening of the carburetor, • has two through holes for receiving fastening screws that interact with threads in the carburetor bowl, so that the carburetor bowl cover is raised and / or offset relative to the carburetor bowl by means of the carburetor bowl spacer, an increased air volume is provided inside the carburetor bowl and the intake airflow via the Venturi funnel into the carburetor is improved. [2] Carburetor bowl spacer according to claim 1, characterized by that the frame has a circumferential collar for precise positioning on the carburetor bowl. [3] Carburetor bowl spacer according to any of the preceding claims, characterized by , that the height of the frame is dimensioned so that the carburetor bowl cover is raised by a predetermined amount compared to its original state, without colliding with components of the engine or the vehicle chassis. [4] Carburetor bowl spacer according to any of the preceding claims, characterized by, that the frame has a mounting surface for the carburetor bowl cover that is offset from the original position, thereby creating additional installation space in the direction away from the vehicle chassis. [5] Carburetor bowl spacer according to any of the preceding claims, characterized by , that the Venturi funnel has a funnel-shaped expansion with the largest possible effective inlet area and flow-optimized rounded transitions towards the intake opening of the carburetor. [6] Carburetor bowl spacer according to any of the preceding claims, characterized by that the carburetor bowl spacer is held exclusively by clamping between the carburetor bowl and the carburetor bowl cover using the mounting screws and has no additional fastening means in the intake tract. [7] Carburetor bowl spacer according to any of the preceding claims, characterized bythat a seal is arranged between the frame and the carburetor bowl and / or between the frame and the carburetor bowl cover, or that the frame is provided with an integrated sealing contour. [8] Carburetor bowl spacer according to any of the preceding claims, characterized by that the carburetor bowl spacer is made of a petrol and oil resistant plastic with a temperature resistance of at least 60 °C. [9] Carburetor bowl spacer according to any one of claims 1 to 7, characterized by that the carburetor bowl spacer is made of metal. [10] Carburetor bowl spacer according to any of the preceding claims, characterized by that the carburetor bowl spacer is manufactured by machining, injection molding, thermal forming or 3D printing. [11] Carburetor unit for a classic motor scooter, comprising a carburetor bowl, a carburetor received in the carburetor bowl, a carburetor bowl cover and a carburetor bowl spacer according to any one of claims 1 to 10, which is arranged between the carburetor bowl and the carburetor bowl cover.

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