JPS5946344A - Apparatus for preventing overspeed rotation of two-cycle engine - Google Patents

Abstract

PURPOSE:To prevent overspeed rotation of an engine, by applying pulsating positive pressure in a crank chamber that is raised and lowered substantially proportionally with the engine speed to a pressure converting means such as a bellofram, diaphragm or cylinder as a force for closing a throttle valve at the time of overspeed operation of the engine. CONSTITUTION:Only when an engine is operated at an overspeed, a control rod 9 on the output side of a pressure converter 15 is pushed outward by the pulsating positive pressure in a crank chamber that is transmitted via a check valve 12, and a governor lever 7 is turned in a direction to close a throttle valve 2. Thus, since the engine speed is lowered automatically, overspeed rotation of the engine can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an over-speed prevention device for preventing engine damage due to over-speed of a 2-recycle cyan engine.

2 Recycle" Cyan (Other 4JJ characteristics) It is often used for the upper cyan of small 1st grade and J3, especially the goo r\tsunoram type vaporizer! 10k J, ri all posture driving ijl
It is widely known that the power source for hand-held all-position work equipment is dedicated to the power source of the ridge saw and brush cutter.

F. 1- Chain saws and brush cutters have a wide variety of cutting tools.
How large or small is the diameter of the cutter, or the length and number of J-iron type cutting tools, etc.? ijl j Cutting tool rotational resistance or jerkiness during vehicle rotation and load operation If the same carburetor adjustment is maintained, if the cutting tool resistance is too high, acceleration will be poor and the rotation will not increase, and if the cutting tool resistance is too low, it will become over-rotated. This may cause burnout or damage to the engine. Recently, the demand for this type of work equipment has increased due to its lightness, and more and more unskilled people are using it, and the carburetor 81! If the machine is operated without proper J adjustment, malfunctions such as damage often occur. Particularly in recent years, due to the reduction in price and weight, there has been an increasing need to prevent damage due to over-rotation of the decoy, as the structure has been reduced to the bare minimum and strength has been reduced to the minimum necessary.

Conventionally, this type of over-rotation prevention device (a) has a system that firstly sends fuel to each engine during resonance due to resonance during over-rotation, suppressing the amount of rotation and preventing over-rotation; The so-called resonance valve is a combination of a banner device and the first type 13 that controls the opening of the throttle valve by 1α in the engine cold Nl wind region and uses the wind pressure applied to the control valve 11 to move the valve in the direction of closing in the event of overspeed. air control method,
A so-called bengahapoo lock is used.

The present invention uses a crank chamber pulse 11 which increases and decreases approximately in proportion to the cyan rotation as an operating force for controlling the throttle valve during over-speed rotation. There is one related to a mixture control system in which the power conversion device is manually operated and the output of A is used to turn the throttle valve in the closing direction to prevent over-speed.

Regarding the drawings, Figure 1 is a longitudinal view of the main parts of the carburetor of this invention (in the figure (1 is the carburetor main body, 2 is the throttle valve, 3 is the throttle valve + 11.4 is the throttle valve) The lever 5 is a return spring that urges the throttle lever 4 in the fully open direction, 0 is the operating stick of the throttle valve lever 4, and the other end is a lever operated by the operator's hand.
The throttle valve shaft 31 (7) is solidified, and the throttle valve 2 (2) is always connected to the throttle valve lever (4). The aperture brake lever 4 is normally rotated in the direction of the opening of the throttle lever 4 and the direction of the body. .

9 is a control - when the culm C over-speeds, the banner lever 7 is pushed and the throttle valve 2 is moved in the opening direction. When you turn the throttle valve 2 in the closing direction, it makes a loud noise.

Figure 2 is a vertical view of the main parts of the device according to the present invention, in which '1 is the carburetor main body, 3 is the throttle valve shaft, 4 is the throttle valve lever, G is the operating culm of the throttle valve lever 4, and 7 (, L power banner lever, 9 is a control rod. 11 is a communication path to the Lnbunk 1 non-k chamber (not shown), 12I is a check valve ↑ (・ Angreshiba (opening the country). Rotation ++: The ball valve is exemplified by the control valve that listens to I., 1/I is snow ring and the ball listens to balance the joint acceleration of ball 13 due to vibration during over-rotation.15 is ji force conversion We accept the flamm type. 1 (3 is 1-) flam, 9 is the control culm fixed to the bellofram, 17 is the bellofram return spring, 1
8 is a leak hole provided at the input end and pulses i, E 1. 't
Appropriately) Adjust C to a constant of 11N so that the flam returns with the return spring 17.

The present invention is constructed in this way (because of this, the crank chamber pulse positive J-t passing through the check valve is only 1,1
In order to push out the output side control rod of the power converter and rotate the sword lever 7 in the closing direction, the throttle valve 2 moves 1 Flr in the direction of the closing force, automatically lowering the rotation, and the skewer that prevents over-rotation is activated. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a vertical view of the essential parts of the present vaporizer, and Fig. 12 is a longitudinal view of the essential parts of the present device. 'f'J g'l Applicant Co., Ltd. Ne1 Urub E" - Tsuno - r - St 5 Shinmaruko Higashi 2-92, Nakahara-ku, Kawasaki-shi Walbrofer East Co., Ltd. 0 Inventor Takahara Sanbe Kawasaki Shinmaruko Higashi 2-92 5, Nakahara-ku, Kawasaki City 2-92 Shin-Maruko Higashi 5 Author: Nobuyuki Kuroki 5-Shinmaruko Higashi 2-92, Nakahara-ku, Kawasaki City 0 author: Tetsuya Shirato Nakahara, Kawasaki City Shinmaruko Higashi 2-92 5, Shinmaruko Higashi Co., Ltd. 0 Author: Teruhiko Hiuchi Shinmaruko Higashi 2-92, Nakahara-ku, Kawasaki City 0 Author: Takao Kaji Shinmaruko Higashi, Nakahara-ku, Kawasaki City 2-92 5 Wall Lofer East Co., Ltd. 0 inventors Author Masatomo Azusawa 2-92 Shinmaruko Higashi, Nakahara-ku, Kawasaki City 5 Wall Lofer East Co., Ltd. 0 inventors Author Yoshimi Seshita 2-92 Shinmaruko Higashi, Nakahara-ku, Kawasaki City 5 Mr. Kazuto Wakasugi, Commissioner of the Patent Office in Orbrofer East, Inc. 1, Incident Display Showa 575f Special Request! '! No. 33364 No. 3, What is the relationship between the person making the amendment and the case? Patent R1 applicant address: 211

Claims (1)

[Claims] Check valve and setting II! The crank plan pulse positive J3: generated by the control valve, which opens at one turn, is input to the pressure transducer, and when the engine overspeeds, J is used as the operating output, and the carburetor throttle valve is automatically moved in the closing direction! 12 cycles over rotation prevention device.