JPS5836181B2 - carburetor throttle lever - Google Patents

Description

[Detailed description of the invention] The present invention relates to a throttle lever for a carburetor.

A throttle lever attached to the throttle shaft that carries the throttle valve of the carburetor is drivably connected to the accelerator pedal located in the driver's seat via a link mechanism, etc. It acts to open the throttle valve.

The throttle lever generally includes a first plate portion extending substantially perpendicular to the throttle shaft and provided with a hole for connection to the throttle shaft; The throttle lever has a U-shape consisting of second and third plate pieces extending perpendicular to and parallel to each other and having a hole or notch for connection to the accelerator pedal. In many cases, it is only possible to design a complicated and large shape, especially the second and third plate portions, depending on the operating method and the operation method.

As the throttle lever becomes more complex and larger, its weight increases, or the distance from the connection with the throttle shaft to the center of gravity of the throttle lever itself becomes longer. When the third plate piece vibrates (resonates) due to traveling vibration, stress acting on the throttle shaft becomes large, causing a problem that the throttle shaft may break.

This means that the locking part that locks one end of the pilot cable for operating the throttle hydraulic control valve of the automatic transmission according to the throttle opening is located at the tip of the second and third plate pieces. In the case of the throttle lever provided with the throttle lever, the stress acting on the throttle shaft becomes even greater because its weight increases and its center of gravity is located further away from the connecting portion of the throttle shaft.

SUMMARY OF THE INVENTION In view of the above-mentioned problems with conventional throttle levers, it is an object of the present invention to provide an improved throttle lever that eliminates these problems.

According to the present invention, a first plate portion extending substantially perpendicularly to the throttle shaft and fixed to the throttle shaft; and a connecting portion that connects the second and third plate portions to each other at a position separated from the first plate portion. This is accomplished by a throttle lever having holes or cutouts in the second and third plate portions for making a connection to the accelerator pedal.

According to this structure, the second and third plate parts are connected to each other by the connecting part at a position spaced apart from the first plate part, so that the second and third plate parts are connected to each other by the connecting part at a position spaced apart from the first plate part. The rigidity of the plate part is increased, thereby bringing the resonance point of the throttle lever and throttle shaft system outside the vibration frequency in the practical range of internal combustion engines, or reducing the vibration acceleration level at the resonance point, The stress acting on the throttle shaft is reduced.

The attached drawings show one embodiment of the throttle lever according to the present invention, in which FIG. 1 is a perspective view showing the entire structure, FIG. 2 is a side view showing the throttle lever installed on a throttle shaft of a carburetor, and FIG. FIG. 3 is a view taken along arrow A in FIG.

The throttle lever 1 according to the invention comprises a first throttle lever 1 which extends in an intake passage 2 of a carburetor substantially at right angles to the axial direction of a throttle shaft 4 carrying a throttle valve 3 and is provided with a mounting hole 5 for the throttle shaft 3. a plate section 6, second and third plate sections 1, 8 extending from both ends of the first plate section 6 substantially perpendicular thereto and parallel to each other; The connecting portion 9 connects the tips of the plate pieces 7 and 8 to each other.

The first, second and third plate portions 6, 7.8 and the connecting portion 9
is formed by bending one plate, and includes a connecting portion 9 which is bent at right angles at the tip of the third plate portion 8 and is substantially parallel to the first plate portion 6. The tip portion is fixed to the tip portion of the second plate piece portion 7 by means such as welding.

The first plate piece 6 is a locking piece for locking one end of the throttle lever return spring 10 (see FIG. 2) on the lower edge of the third plate piece 8. 11, and the second and third plate portions 7, 8 are each provided with a hole 12 and a notch 13 for connection to an accelerator pedal (not shown).

In addition, in the case of this embodiment, the third plate piece 8 has one end of a pilot cable (not shown) at its tip for operating the throttle hydraulic control valve of the automatic transmission according to the throttle opening. The connecting part 9 is provided with a groove-shaped member 15 for guiding the pilot cable.

In the throttle lever 1 having such a structure, one end of the throttle shaft 4 is passed through the mounting hole 5 provided in the first plate portion 6 of the throttle lever 1, and a nut 16 is screwed into a threaded portion provided at the one end. is attached to the throttle shaft 4 by.

FIG. 4 is a graph showing the results of a vibration test of a conventional throttle lever not provided with the connecting portion 9 and the throttle lever according to the present invention shown in FIG.

In this graph, the solid line is the test result with the conventional throttle lever, and the broken line is the test result with the throttle lever according to the present invention.

Each acceleration G was measured at the tip of the nut attachment part of the throttle shaft.

As is clear from this, the conventional throttle lever generates a considerable acceleration at a frequency of around 250Hz, but the throttle lever according to the present invention generates a considerable acceleration at a frequency of around 170Hz.
The acceleration G can be reduced to about 1/4 of the conventional type at around Hz, and the durability of the throttle shaft system can be improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the throttle lever according to the present invention, and FIG. 2 is a side view showing the throttle lever shown in FIG. 1 attached to a throttle shaft.
FIG. 3 is a view taken in the direction of arrow A in FIG. 2, and FIG. 4 is a graph showing the results of testing a conventional throttle lever and a throttle lever according to the present invention using a vibration tester. 1... Throttle lever 2... Intake passage, 3... Throttle valve, 4...
・Throttle shaft, 5...Mounter L6・
...First plate piece part, 7... Second plate piece part, 8... Third plate piece part, 9... Connection part, 10...Spring, 11...Spring locking piece, 12...JL13...
- Notch, 14...Locking portion, 15...Groove member, 16...Nut.

Claims (1)

[Claims] 1. A first plate portion extending substantially perpendicular to the throttle shaft and fixed to the throttle shaft; a second plate portion extending substantially perpendicular thereto and parallel to each other from both ends of the first plate portion; a third plate piece portion; and a connecting portion that connects the second and third plate piece portions to each other at a position separated from the first plate piece portion, 1. A throttle lever for a carburetor, characterized in that one part thereof is provided with a hole or a cutout for connection to an accelerator pedal.