JP2555568Y2 - Sliding valve carburetor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding valve type carburetor, and more particularly to a connecting structure between a throttle lever and a throttle shaft.

[0002]

2. Description of the Related Art Conventionally, as a sliding valve carburetor, there is known a carburetor in which a piston valve for changing a flow passage area of an intake passage and a throttle shaft rotating in conjunction with an accelerator mechanism are connected by a throttle lever. ing. The throttle shaft is fitted into a through hole provided at the base end of the throttle lever, and is fixed to the throttle shaft by a screw. In such a sliding valve type carburetor, when removing the piston valve from the carburetor body, after removing the screw, pull out the throttle shaft from the through hole of the throttle lever, and in this state, remove the piston valve together with the throttle lever ing. Also,
Some sliding valve carburetors used in a racing engine in which a piston valve is frequently attached and detached are configured so that a connection between the tip of a throttle lever and the piston valve can be disconnected. In such a carburetor, when removing the piston valve, after removing the screw, the throttle lever is rotated relative to the throttle shaft and lifted to a predetermined position. In this state, the connection between the throttle lever and the piston valve is disconnected, and the piston valve is removed.

[0003]

Among the conventional sliding valve carburetors described above, in the former carburetor, the throttle shaft must be removed from the throttle lever every time the piston valve is attached and detached. In a multiple carburetor having a long throttle shaft common to
There is a problem that a lot of time and effort are required for the work of attaching and detaching the piston valve. In the latter carburetor, the removability of the piston valve is better than in the former carburetor, but the connection between the tip of the throttle lever and the piston valve is
Since there is a mechanism for disconnecting these connections, there is a problem that the structure is very complicated and the number of parts and the number of assembling steps are increased. SUMMARY OF THE INVENTION An object of the present invention is to provide a sliding valve type carburetor which has a simple structure and can reduce the cost, and can easily attach and detach the sliding valve in a short time. I do.

[0004]

SUMMARY OF THE INVENTION A sliding valve carburetor according to the present invention comprises a sliding valve for changing a flow passage area of an intake passage formed in a carburetor main body and a rotatable carburetor main body. A throttle shaft supported and rotated in conjunction with an accelerator mechanism, a throttle lever having a base end connected to the throttle shaft and the other end connected to the slide valve; The circumferential length of the throttle shaft at the contact surface with the throttle shaft is not more than half of the entire circumference of the throttle shaft.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 is a view showing a sliding valve carburetor according to a first embodiment of the present invention. In this figure, the flow passage area of the intake passage 11 of the carburetor body 10 is adjusted by a piston valve 30. That is, the opening and closing operation of the accelerator mechanism (not shown) displaces the piston valve 30 to change the cross-sectional area of the intake passage 11, thereby controlling the intake flow rate.

[0006] A guide hole 12 is provided in the carburetor body 10 so as to be substantially perpendicular to the intake passage 11. A piston valve 30 is slidably fitted in the guide hole 12. A metering jet 13 is provided in the intake passage 11 at a position facing the guide hole 12. The metering jet 13 communicates with a main fuel supply system (not shown). An air funnel 14 is formed integrally with the carburetor body 10 on the upstream side (right side in the figure) of the intake passage 11.

A space 17 for accommodating the throttle shaft 15 and the throttle lever 16 is provided above the guide hole 12 in the vaporizer main body 10 so as to communicate with the guide hole 12. The upper part of the space 17 is closed by a cover 18 attached to the upper surface of the vaporizer main body 10. The throttle shaft 15 is rotatably supported by the carburetor body 10 through the space 17 in a direction perpendicular to the plane of the paper, and is connected to an accelerator mechanism. The throttle lever 16 is attached to a predetermined position of the throttle shaft 15 by a screw 19.

An engagement groove 20 having a semicircular cross section is formed at the base end of the throttle lever 16 so as to fit over the outer peripheral surface of the throttle shaft 15. That is, the circumferential length of the contact surface of the engagement groove 20 with the throttle shaft 15 is substantially half of the entire circumference of the throttle shaft 15. Also throttle lever 1
6, a through-hole 21 connected to the center of the engagement groove 20 is formed. The through hole 21 is positioned so as to communicate with a positioning hole 22 provided at a predetermined position of the throttle shaft 15. A screw 19 is inserted into the through hole 21 and the positioning hole 22, and the screw 19 connects the throttle lever 16 to the throttle shaft 15.

A hole 23 is provided at the tip of the throttle lever 16.
The pin 24 is press-fitted into the hole 23 in a direction perpendicular to the paper surface. The pin 24 is inserted into a long hole 32 of a connection plate 31 of the piston valve 30 described later.

[0010] The base end of the piston valve 30 (upper part in the figure)
, A connecting plate 31 is protruded. Connecting plate 3
1 is provided with a long hole 32 formed long in the left-right direction in the figure. The pin 2 of the throttle lever 16 is
4 is inserted and supported with play in the left-right direction. Thereby, when the throttle lever 16 swings, the piston valve 30 is moved up and down by the pin 24 which relatively moves in the left and right direction in the long hole 32 of the connecting plate 31,
The amount of protrusion into the intake passage 11 changes to control the intake flow rate.

A metering needle 33 protrudes into the intake passage 11 and penetrates through the distal end of the piston valve 30.
Is supported, and the tip of the metering needle 33 is
It is inserted into the metering jet 13. That is, the sectional area of the fuel passage of the metering jet 13 is controlled by the vertical movement of the piston valve 30, and the amount of fuel supplied to the intake passage 11 is adjusted.

The operation of this embodiment will be described. When the accelerator mechanism is operated in the opening direction, the throttle shaft 15 rotates clockwise in the drawing, and in conjunction with this, the throttle lever 16 swings clockwise. The swing of the throttle lever 16 is transmitted to the piston valve 30 via the pin 24 and the elongated hole 32 of the connecting plate 31, and the piston valve 3
0 slides along the guide hole 12 and moves upward. As a result, the amount of protrusion of the piston valve 30 into the intake passage 11 decreases, the cross-sectional area of the intake passage 11 increases, and the intake flow rate increases. When the accelerator mechanism is operated in the closing direction, the intake flow rate decreases through the same reverse process as described above.

When removing the piston valve 30 from the carburetor body 10 for replacement or the like, the screw 19 is first removed with the cover 18 removed. Then, by lifting the base end of the throttle lever 16, the engagement groove 20 is released from the throttle shaft 15, the throttle lever 16 and the piston valve 30 are pulled up, and the piston valve 30 is taken out from the guide hole 12.

Further, the piston valve 30 is connected to the carburetor body 1.
0, the piston valve 30 is inserted into the guide hole 1
2 and the engagement groove 20 of the throttle lever 16 is engaged with the outer peripheral surface of the throttle shaft 15 so that the through hole 21 of the throttle lever 16 communicates with the positioning hole 22 of the throttle shaft 15. Align. In this state, the through hole 21 of the throttle lever 16 and the positioning hole 22 of the throttle shaft 15
The throttle lever 16 is connected to the throttle shaft 15.

As described above, in the above embodiment, the engagement groove 20 of the throttle lever 16 does not engage with the entire circumference of the circular cross section of the throttle shaft 15, but engages only about half of the outer circumference of the circular cross section. Is what you do. Therefore, the throttle lever 16 is released from the throttle shaft 15 by disengaging and lifting the screw 19 during disassembly, and can be fitted to the throttle shaft 15 from above during assembly. That is, according to this embodiment, the throttle shaft 15 is moved in the axial direction each time the
It is not necessary to remove the screw 19, and only the screw 19 needs to be detached. Therefore, the time required for attaching and detaching the piston valve 30 can be greatly reduced, and the effect of this embodiment is particularly remarkable in a multiple-equipped carburetor.

FIG. 2 is a sectional view showing a sliding valve carburetor according to a second embodiment of the present invention. In this vaporizer,
The surfaces where the throttle lever 16 and the throttle shaft 15 engage with each other are flat surfaces. That is, the engagement groove is not provided in the throttle lever 16, and the base end of the throttle lever 16 is formed in a flat plate shape. At a predetermined position in the axial direction of the throttle shaft 15, an engagement surface 40 formed in a flat shape so as to match the shape of the base end of the throttle lever 16 is provided. The throttle lever 16 has its proximal end engaged with the engaging surface 40 and the throttle shaft 1 is rotated by the screw 19.
5 is attached. The size of the contact surface between the base end of the throttle lever 16 and the engagement surface 40, that is, the circumferential length of the contact surface of the throttle shaft 15 is less than half of the entire circumference of the throttle shaft 15.

Also in this configuration, with the screw 19 removed, the throttle lever 16 is attached to and detached from the throttle shaft 15 only by lifting the throttle lever 16. Therefore, according to the present embodiment,
The same effects as in the first embodiment can be obtained.

[0018]

As described above, according to the present invention, the mounting and dismounting of the sliding valve can be easily performed in a short time, and the cost can be reduced with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a sliding valve carburetor according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a sliding valve type carburetor according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 carburetor body 11 intake passage 12 guide hole 15 throttle shaft 16 throttle lever 19 screw (connecting member) 20 engaging groove (engaging surface) 30 piston valve (sliding valve)

Claims (1)

(57) [Scope of request for utility model registration] A sliding valve for changing a flow passage area of an intake passage formed in the carburetor body; a throttle shaft rotatably supported by the carburetor body and rotating in conjunction with an accelerator mechanism; A throttle lever having a base end connected to the throttle shaft and the other end connected to the slide valve; and a circumferential length of a contact surface of the base end with the throttle shaft, the circumferential length of the throttle shaft being: A sliding valve type carburetor characterized in that it is not more than half of the entire circumference of the throttle shaft.