JPS588932Y2 - carburetor starter device - Google Patents

Description

[Detailed description of the invention] This invention aims to automate the starter in a carburetor that uses a starter.

In the past, it was common for starters to be operated manually from the start to the end of warm-up, but recently there have been many proposals to fully automate the starter by using thermowax, which changes volume depending on the temperature. However, since these proposals are complicated and expensive, the present invention attempts to automate a simple starter that is free from practical problems.

Embodiment 1 of the present invention shown in the figure To explain in detail, 1 is the starter device main body, 2 is the starting mixture passage, 3 is the starter plunger, 4 is the starting fuel passage, 5 is the starting air passage, 6 is the atmospheric chamber, 7 is a diaphragm, 8 is a plunger spring, 9 is a spring receiver, 10 is a pressure chamber, and 11 is a diaphragm spring, which is set to be stronger than the spring 8.

12 is a spring receiver, 13 is a starter rod that is fixed to the spring receiver, and 14 is a diaphragm holding plate that fixes the diaphragm.

Incidentally, the spring receiver 12 may be fixed to a diaphragm and used as a restraining plate.

15 is an O-ring, 16 is a starter knob, 17 is a temperature sensing valve,
18 is a cylinder of the engine, 19 is a bimetal, 20 is a chamber housing the bimetal, 21 is a passage that communicates the pressure chamber 10 with the chamber 20, and 22 is a passage that communicates the atmosphere or the air cleaner with the chamber 20. In the state shown in the figure, the bimetal 19 is used to block the connection.

Reference numeral 23 denotes a branch passage that communicates the passages 21 and 22 with a check valve 2.
I can see 4.

Note that 25 is a leak provided in the passage 21 or the pressure chamber 10 as necessary.

The operation of the above configuration is exactly what works (to explain in detail, when you pull the starter knob 16 during starting, the spring 1
1 is compressed because the splash catch 12 is pulled up, and the diaphragm T is released from its spring force, so that the lower side of the diaphragm T is moved upward by the spring 8 for opening the plunger.

The pressure chamber 10 thus reduces its volume and the air inside opens the check valve 24 and escapes through the passage 22 to the air cleaner or to the atmosphere.

In this case, the bimetal of the temperature sensing valve 17 blocks communication between the chamber 20 and the passage 22 as shown in the figure, and the pressure chamber 10 is sealed.

Therefore, when the starter knob is released, the diaphragm 7 tries to move downward due to the spring 11, but the check valve 24
As a result, no air enters the pressure chamber 10, the diaphragm does not move, and the starter plunger 3 remains in the fully open position.

When the engine is cranked in this state, the intake negative pressure generated in the air-fuel mixture passage 2 draws fuel from the air passage 4 and air from the air passage 5, and supplies them as a mixture to the engine from the passage 2.

During warm-up operation, the bimetal 19 increases the engine temperature, and when it reaches a certain temperature, it reverses and connects the chamber 20 and the passage 22. Therefore, the pressure chamber 10 admits air from the atmosphere through the passages 21 and 22, and the diaphragm I descends from the spring 111 and pushes down the plunger 3 which is in contact with the diaphragm 1, thereby reducing the air-fuel mixture passage 2 in the warm-up state.

It goes without saying that the bimetal of the temperature-sensing valve 17 can be replaced with thermowax or the like.

[Next] This passage 21 or the pressure chamber 10 (if a leak 25 is attached) (In this case, when the starter knob 16 is pulled to start the pressure chamber, air will enter from the first leak without overcoming the temperature rise.) , the diaphragm descends, and the plunger also gradually closes after a certain period of time (depending on the magnitude of the leak).

This is effective when the engine is driven slowly with the starter turned on after starting.

Note that even in the case of a leak, if a constant temperature I is maintained, the plunger will close once rapidly, as described above.

Also, during restart 1 after warming up, the temperature sensing valve 17 is open, so when the starter knob is pulled and released, the diaphragm 7 immediately descends one step, pushing down the plunger and disabling the starter. do.

As mentioned above, the present invention is designed to prevent the starter from turning off when starting (just pulling the starter knob automatically warms up the engine) and forgetting to return the starter (starter Q, for example) or operating the starter at high temperatures (fuel leakage). It prevents wastage and has great industrial effects.

[Brief explanation of drawings]

The figure is a sectional view of the main part showing an embodiment of the present invention.
Starter plunger 6...Atmospheric chamber, 7...Diaphragm, 10...Pressure chamber, 17...Temperature sensing valve, 1
9...Bimetal, 24...Check valve.

Claims (1)

[Scope of utility model registration request] An atmospheric chamber 6 and a pressure chamber 10 separated by a diaphragm 7, a starter plunger 3 which is in contact with one end of the diaphragm 1 and is normally pressed in the open direction, and a starter plunger 3 housed in the pressure chamber 10 and connected via the diaphragm 7. A spring 11 that normally presses the plunger 3 in the closing direction, a starter knob 16 that releases the compression force of the spring 11 at startup, and a non-return check in the passage that communicates the pressure chamber 10 with the atmosphere or an air cleaner. A starter device for a vaporizer comprising a valve 24 and a temperature sensing valve 17 arranged in parallel.