Title of Invention

STARTER OF CARBURETOR

Abstract

A starter of a carburetor 1 comprises a starter fuel well 16 in addition to a main fuel well 6 and the starter fuel well 16 is connected to the main fuel well 16 via a starter fuel jet 26. In this configuration, to always supply a new fuel to the starter and to improve a starting performance at the time of engine start, a fuel intake 25 of the starter fuel jet 26 is prolonged to the vicinity of a needle valve 9 of the main fuel well 6.

Full Text

- 1 - BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a starter of a carburetor which easily supplies a mixture having an optimum concentration for the start and warm-up of an engine. Description of the Related Art In a conventional starter of a carburetor, as shown in Fig. 3, a starter fuel well 16 is disposed in addition to a main fuel well 6, and the starter fuel well 16 is connected to the main fuel well 6 via a starter fuel jet 101. Furthermore, in the starter fuel well 16, a starter pipe 22 is hung down, and the upper portion of the starter pipe 22 is connected to a starter fuel nozzle 21, whereby an intake negative pressure which acts on the starter fuel nozzle 21 at the start of an engine is introduced into the starter fuel well 16 through the starter pipe 22, so that a fuel in the main fuel well 6 is sucked through the starter fuel jet 101 and then supplied to the engine via the starter fuel nozzle 21. However, if such a starter is not used for a long time, a volatile component of the fuel evaporates, so that a starting performance tends to deteriorate. In addition, after the fuel is allowed to stand for a - 2 - long time, the amount of the fuel in the main fuel well 6 decreases due to the evaporation and the like of the fuel. When a fuel cock which is not shown is opened for engine start, a new fuel flows via a needle valve 9. At this time, however, since the starter fuel jet 101 is not usually arranged in the vicinity of the needle valve 9, no new fuel flows around the starter fuel jet 101, so that the engine start is not successfully performed. SUMMARY OF THE INVENTION An object of the present invention is to always supply a new fuel to a starter at the time of engine start and to thereby improve a starting performance. According to the present invention, a fuel intake of a starter fuel jet is prolonged adjacently to a lower portion of a needle valve for a main fuel well. This constitution allows the fuel intake circumference of the starter fuel jet to be immediately filled with the new fuel which flows in the main fuel well when the needle valve opens and can improve the starting performance of an engine. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Fig.1isa longitudinal sectional view showing an embodiment according to the present invention. - 3 - Fig. 2 is a sectional view taken along the A - A line in Fig. 1. Fig. 3 is a longitudinal sectional view showing a conventional starter of a carburetor. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The embodiment of the present invention will be described in detail according to one example of the present invention illustrated in the attached drawings. In Fig. 1 and Fig. 2, reference numeral 1 is a carburetor, and a body 2 of the carburetor is provided with an intake path 3 so that the intake path 3 may pass through the body 2. In the same drawings, the intake path 3 is connected to an air cleaner not shown on an upstream side and is connected to an engine not shown on a downstream side. Further, a throttle valve 4 which controls the effective diameter of the intake path 3 is arranged in this intake path 3. A main fuel well 6 is disposed at the lower portion of the intake path 3. A float 8 which moves up and down around a shaft 7 in accordance with the height of a fuel surface is arranged in the main fuel well 6 and a fuel intake 10 of the fuel well 6 is on/off-controlled by a needle valve 9 which interlocks with this float 8. The above carburetor body 2 is provided with a main nozzle boss 11 which protrudes to the fuel well 6, and in this boss 11, a main nozzle 12 is - 4 - accommodated. The upper end of the main nozzle 12 faces to the intake path 3, and the lower end thereof is prolonged below the oil level in the main fuel well 6 via a main jet 13. Furthermore, the carburetor body 2 is equipped with a starter boss 15 which protrudes to the fuel well 6, and in this boss 15, a starter fuel well 16 is disposed in addition to the main fuel well 6. The above carburetor body 2 is provided with a starter throttle valve chamber 18. A starter air path 19 and a starter mixture path 20 open through the side of the starter throttle valve chamber 18, and a starter fuel nozzle 21 opens through the bottom thereof. The other side of the starter air path 19 is connected to the intake path 3 on the upstream side of the throttle valve 4 or the air, and the other side of the starter mixture air path 20 is connected to the intake path 3 on the downstream side of the throttle valve 4. The starter fuel nozzle 21 is connected to the starter fuel well 16 via a starter pipe 22. A starter piston valve 23 is slidably accommodated in the starter throttle valve chamber 18, the starter air path 19 and the starter mixer path 20 are on/off controlled by the periphery of the starter piston valve 23, and the starter fuel nozzle 21 is on/off controlled by the bottom of the starter piston valve 23. The amount of fuel supplied from the starter fuel nozzle 21 is adjusted by a needle 24 which protrudes from the bottom - 5 - of the starter piston valve 23. On the other hand/ a starter fuel jet 26 which prolongs a fuel intake 25 adjacently to the lower portion of the needle valve 9 is mounted on the starter boss 15 and introduces a new fuel immediately after it passes through the needle valve 9 to the starter fuel well 16. Further, a starter air jet 27 which interconnects the starter fuel well 16 onto the fuel liquid level in the main fuel well 6 is disposed in the starter boss 15. Subsequently, since the starter air jet 27 can be machined via a mounting hole 28 of the starter fuel jet 26 by arranging the starter fuel jet 26 and the starter air jet 27 on one axis L - L which crosses the starter fuel well 16 and inclines upward from the side of the starter fuel jet 26 to the side of the starter air jet 27, machining man-hour can be reduced without needing to perforate excessive holes for machining and blind plugs for filling in unnecessary holes produced at aforementioned machining can be disused. According to the present invention, a fuel intake of a starter fuel jet is prolonged adjacently to the lower portion of a needle valve of a main fuel well, thereby being capable of immediately supplying a new fuel which flows in the main fuel well via the needle valve to an engine and improving the starting performance of the engine. Further, since the starter air jet can be - 6 - machined via the mounting hole of the starter fuel jet by coaxially arranging the starter fuel jet and the starter air jet on one axis which crosses the starter fuel well and inclines upward from the side of starter fuel jet toward the side of the starter air jet, excessive holes need not to be perforated for machining, machining man-hour can be reduced. At the same time, blind plugs for filling in the unnecessary holes at aforementioned machining can be disused and the cost of a carburetor can be reduced. WE CLAIM: 1. A starter of a carburetor in which a starter fuel well 16 is disposed in addition to a main fuel well 6, and the starter fuel well 16 is connected to the main fuel well 6 via a starter fuel jet 26, characterized in that a fuel intake 25 of the starter fuel jet 26 is prolonged in the vicinity of a needle valve 9 of the main fuel well 6 to always supply a new fuel to the starter and to improve a starting performance at the time of engine start. 2. The starter of the carburetor as claimed in claim 1, wherein the starter comprises a starter air jet 27 which connects the starter fuel well 16 onto a fuel liquid level in the main fuel well 6, and the starter air jet 27 and the starter fuel jet 26 are arranged on one axis which crosses the starter fuel well 16 and inclines upward from the side of the starter air jet 26 toward the side of the starter air jet 27. Dated this 2nd day of MARCH, 2001. of L.S. DAVAR & CO. APPLICANTS' AGENT. A starter of a carburetor 1 comprises a starter fuel well 16 in addition to a main fuel well 6 and the starter fuel well 16 is connected to the main fuel well 16 via a starter fuel jet 26. In this configuration, to always supply a new fuel to the starter and to improve a starting performance at the time of engine start, a fuel intake 25 of the starter fuel jet 26 is prolonged to the vicinity of a needle valve 9 of the main fuel well 6.

Documents:

00124-cal-2001-abstract.pdf

00124-cal-2001-assignment.pdf

00124-cal-2001-claims.pdf

00124-cal-2001-correspondence.pdf

00124-cal-2001-description(complete).pdf

00124-cal-2001-drawings.pdf

00124-cal-2001-form-1.pdf

00124-cal-2001-form-18.pdf

00124-cal-2001-form-2.pdf

00124-cal-2001-form-26.pdf

00124-cal-2001-form-3.pdf

00124-cal-2001-form-5.pdf

00124-cal-2001-p.a.pdf

00124-cal-2001-priority document others.pdf

00124-cal-2001-priority document.pdf

124-cal-2001-granted-abstract.pdf

124-cal-2001-granted-assignment.pdf

124-cal-2001-granted-claims.pdf

124-cal-2001-granted-correspondence.pdf

124-cal-2001-granted-description (complete).pdf

124-cal-2001-granted-drawings.pdf

124-cal-2001-granted-examination report.pdf

124-cal-2001-granted-form 1.pdf

124-cal-2001-granted-form 18.pdf

124-cal-2001-granted-form 2.pdf

124-cal-2001-granted-form 26.pdf

124-cal-2001-granted-form 3.pdf

124-cal-2001-granted-form 5.pdf

124-cal-2001-granted-letter patent.pdf

124-cal-2001-granted-priority document.pdf

124-cal-2001-granted-reply to examination report.pdf

124-cal-2001-granted-specification.pdf

124-cal-2001-granted-translated copy of priority document.pdf