Intake throttle valve return device of engine

Details Intake throttle valve return device of engine Intake throttle valve return device of engine

1988-10-13

1989-11-14

Chambers, A. Michael

Valves and valve actuation

Biased valve

Springs and spring retainers

251305, 267155, F16K 122

Patent

active

048802077

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION



Field of the Invention

The present invention relates to an intake throttle valve return device of engine that is to be used in a fuel injector or a carburetor.
FIG. 1 is a longitudinal sectional view showing a
prior-art intake throttle valve return device disclosed in for example Laid-Open Japanese Patent No. Sho 59-46345. In this drawing, numeral 1 denotes a carburetor body, and numeral 2 is a throttle valve securely fixed on a valve shaft 3. Numeral 4 designates a supporting arm fixed on the carburetor body 1, and numeral 5 is a bowl-shaped collar holder inserted and locked to support on the valve shaft 3, and is provided with a flange section 6. Numerals 7, 8 are cylindrical collars with a flange to receive an outer torsion spring 9; numerals 10, 11 are cylindrical collars having a flange for receiving the ends of an inner torsion spring 12; and numerals 13, 14 are cylindrical sleeves which are inserted and locked to support respectively on the valve shaft 3, and interposed between the above-mentioned cylindrical collars 7, 10 and between he cylindrical collars 8, 11, thereby preventing contact and interference between the aforementioned torsion springs 9, 12. Numeral 15 is a lock pin fixedly installed to the aforementioned carburetor body 1 for retaining the ends of torsion springs, and numeral 16 designates a throttle valve lever connected to the end of the valve shaft .
Either of the other end of the aforementioned torsion spring 9 and the other end of the torsion spring 12 inserted into the cylindrical sleeve 14 are locked at engaging portions 17, 17 formed on the above-mentioned throttle valve lever 16, and each one end is also locked on the above-described pin 15. Thus both the torsion springs 9 and 12 are wound around, and twisted into, the valve shaft 3 so that a spring force will act in the direction where the throttle valve 2 will be closed.
The above-mentioned bowl-shaped collar holder 5, as shown in the plane view of FIG. 2 and the side view of FIG. 3, has cutout ends 5a, 5b formed to hold the cutout section throughout the range of angle .alpha. corresponding to the angle of rotation of the valve shaft 3, and from this cutout section, one end of the inner torsion spring 12 is led outwardly, being locked on the pin 15.
The above-mentioned cylindrical sleeve 13 also, as shown in the sectional view of FIG. 4, are provided with cutout ends 13a and 13b formed to hold the cutout section throughout the range of angle corresponding to the angle of rotation of the valve shaft 3, and from this cutout section one end of the inner torsion spring 12 is led outwardly.
The valve shaft 3 described above, as shown in FIG. 4, has a cutout locking section 3a formed in parallel with the outer periphery, ranging from the supporting arm 4 portion to the shaft end, and the bowl-shaped collar holder 5 and the cylindrical sleeve 13 are provided with engaging holes 5c and 13c respectively which are formed to be engaged with this cutout locking section 3a.
The prior-art intake throttle valve return device, however, has the following problems.
(1) The bowl-shaped collar holder 5 and the cylindrical sleeve 13 have a wide cutout section so formed as to lead out one end of the inner torsion spring 12, resulting in a decrease in mechanical strength and difficulty in manufacture.
(2) Multiplication of parts are required.
(3) The valve shaft 3 has the cutout engaging section 3a formed from the supporting arm 4 position to the shaft end, resulting in decreased mechanical strength. To compensate for it, the shaft diameter has to be increased.
(4) Other ends of the torsion springs 9, 12 are led out in an axial direction and further bent in the circumferential direction. The cylindrical collar 11, the cylindrical sleeve 14 and the throttle valve lever 16 are provided with a circumferential long hole through which the end of the springs is inserted, on account of which, however, the mechanical strength of these parts is low.
(5) In assembling work, since the cylindrical sleeve 14 and the throttle v

REFERENCES:
patent: Re22030 (1942-02-01), Boller
patent: 3395727 (1968-08-01), Weise et al.

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