JPS6115216Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic fast idle device that can automatically cancel the fast idle function by depressing the accelerator pedal before starting an automobile engine or during warm-up.

Conventionally, in carburetors equipped with automatic chokes that are installed in automobile engines, fast idle cams are used to regulate the idle opening of the throttle valve according to the degree of opening of the choke when the choke operates. . However, in conventional fast idle cams, the throttle lever is engaged with the lowest stage of the fast idle cam - that is, the fully open position of the throttle valve - when the rotation of the automobile engine is stopped, so the engine cannot be started. In this case, it is necessary to depress the accelerator pedal once to disengage the throttle lever from the fast idle cam, and then engage the throttle lever to the top stage of the fast idle cam to fully close the check valve. did. Moreover, if the engine is left to run after it has been started, the throttle lever will engage the top stage of the fast idle cam, causing the engine to run at high rpm forever, wasting fuel and producing loud noise. The problem is that it continues to occur.

In addition, in order to prevent wasteful consumption of fuel and generation of noise after the engine starts, the fast idle cam is automatically rotated in conjunction with the expansion and contraction movement of the heat-sensitive expansion body, thereby gradually lowering the throttle lever. There is also a type of fast idle device that gradually reduces the opening of the throttle valve, but it is said that the absolute reliability of the heat-sensitive expansion body is poor, so it is said that sufficient reliability for operation cannot be obtained. There were drawbacks.

An object of the present invention is to eliminate the various drawbacks of the prior art described above and to provide an automatic fast idle device that operates reliably with an extremely simple configuration.

The basic structure of the present invention is that a fast idle cam that rotates in conjunction with the expansion and contraction movement of the heat-sensitive expansion body is attached to the carburetor body, and a throttle lever that rotates integrally with the throttle valve is engaged with the fast idle cam. In the automatic fast idle device which is removably arranged, an electromagnet device is arranged on one side of the throttle lever, a rod abutting portion is formed on the throttle lever, and the electromagnet is attached to the rod abutting portion. The telescopic rods of the device are positioned opposite each other, and the electromagnetic device is energized for a certain period of time during engine startup and during engine warm-up, respectively, and the throttle lever is moved in the opening direction by extending the telescopic rod. A timer is provided to rotate the throttle lever and the fast idle cam to temporarily disengage the same, and a power source is provided for energizing the electromagnetic device at least through the timer. Automatic fast idle device.

Hereinafter, embodiments of the present invention will be described based on the drawings.

Figures 1 to 3 show a first embodiment of the present invention, and Figure 1 shows the front view of the automatic fast idle device when the engine is stopped after the engine has been sufficiently warmed up after operation. Figure 2 is
FIG. 1 shows a front view of the automatic fast idle device when the engine is started from the state shown in FIG. 1, and FIG. 3 shows a schematic diagram of the electric circuit of the automatic fast idle device. A bench lily portion 1a is formed inside the electrifier body 1, and a choke valve 2 is placed on the upstream side of the bench lily portion 1a, and a throttle valve 3 is placed on the downstream side of the bench lily portion 1a. The choke valve 2 is fixed to a shaft 2a, and the shaft 2a is rotatably supported by the carburetor body 1. Levers 2b and 2c are also fixed to the shaft 2a, and a connecting rod 4 has one end rotatably engaged with the lever 2b.

On the other hand, one end of a heat-sensitive expansion body 5 such as a bimetal coil is engaged with the lever 2c.
The other end is locked to a fixed part (not shown) of the carburetor main body 1 or the like. Therefore, when the engine is not warmed up, the pulling force of the heat-sensitive expansion body 5 in the A direction acts on the yoke valve 2 to rotate in the closing direction. Thermal expansion body 5
is housed in a casing 6 fixed to the vaporizer main body 1, and a heater coil (not shown) is housed in the casing 6 at a position facing the heat-sensitive expansion body 5. The heater coil is used to cause the heat-sensitive expansion body 5 to expand by a certain amount when a certain period of time has elapsed after starting the engine, thereby opening the check valve 2 by a certain amount.

A fast idle cam 7 is rotatably attached to the side surface of the carburetor body 1 supported by a shaft 8, and one end of the fast idle cam 7 has three cam surfaces 7a, 7b, and 7c having successively different heights. It is formed. Here, the cam surface 7a is the uppermost cam surface, the cam surface 7b is the center cam surface, and the cam surface 7c is the lowermost cam surface. On the other hand, the lower end of a connecting rod 4 is rotatably engaged with the other end of the fast idle cam 7, and due to the presence of the connecting rod 4, the fast idle cam 7 rotates in conjunction with the check valve 2. .

The throttle valve 3 is fixed to the shaft 3a, and the throttle valve 3 is fixed to the shaft 3a.
a is rotatably supported by the carburetor main body 1.
A throttle lever 9 is integrally fixed to the shaft 3a. is formed. The throttle valve 3 is always urged to rotate in the closing direction by an unillustrated triggering means or the like, and
Naturally, it rotates in conjunction with an accelerator pedal (not shown).

An electromagnetic device 10 consisting of a solenoid or the like is fixed to the carburetor main body 1 by a stopper 11 and is located on one side of the throttle lever 9. Electromagnetic device 10
The telescopic rod 10a is located opposite the rod abutting portion 9b of the throttle lever 9.
The throttle lever 9 can be rotated in the direction A by the extension operation a.

One end of the coil 10b of the electromagnet device 10 is connected to the output ends of two timers 12 and 13 arranged in parallel with each other, and the other end of the coil 10b of the electromagnet device 10 is grounded. Also, timer 12,1
The input ends of 3 are connected to the output ends of a handbrake switch or a gear neutral switch 14, respectively. The input end of a handbrake switch or gear neutral switch 14 is connected to an ignition terminal 15a of a key switch 15, and an input terminal 15b of the key switch 15 is connected to a positive terminal of a power source 16. power supply 16
The negative terminal of is grounded, and 15c is
The start terminal of the key switch 15 is shown.

In the electric circuit diagram shown in FIG. 3, a timer 12 is a timer that allows the electromagnet device 10 to be energized for a certain period of time when the engine is started, and a timer 13 is a timer that allows the electromagnetic device 10 to be energized for a certain period of time when the engine is warmed up, and a timer 13 is a timer that allows the electromagnetic device 10 to be energized for a certain period of time when the engine is warmed up. The timers that allow the electromagnet device 10 to be energized are shown respectively. Also, the reason why a handbrake switch or gear neutral switch 14 is provided in the figure is that when the car is started immediately after the engine is started, the timer 13 is activated while the car is running and the car is stopped by the driver. This is to prevent the vehicle from being accelerated against its will. That is, the handbrake switch or gear neutral switch 14 is closed only when the handbrake is activated or when the gear is in neutral.

Hereinafter, the operation of the first embodiment of the present invention will be explained based on FIGS. 1 to 3.

As described above, when the automobile is driven and the engine is sufficiently warmed up, the heat-sensitive expansion body 5 is heated, and as a result, the yoke valve 2 rotates in the direction opposite to A (see FIG. 2). Therefore, when the fast idle cam 7 also rotates in the direction opposite to A and the rotation of the engine is stopped, the foot 9a of the throttle lever 9 is at the lowest stage of the fast idle cam 7, as shown in the first diagram. is engaged with the cam surface 7c. As a result, even if the heat-sensitive expansion body 5 cools down and applies a rotation biasing force in the A direction to the fast idle cam 7, the engagement between the cam surface 7c and the leg portion 9a does not come off. remains open.

To start the engine again from the state shown in FIG. 1, the handbrake (not shown) must be applied or the gear must be in the neutral position, so that the handbrake switch or the gear neutral switch 14 is closed. The timer 12 is started by connecting the key switch 15 to the ignition terminal 15a. After the timer 12 starts to operate, the electromagnet device 10 is energized for a certain period of time, so that the telescopic rod 10a extends and its tip abuts against the rod abutment portion 9b of the throttle lever 9, temporarily rotating the throttle lever 9 in the direction A. This disengages the cam surface 7c of the fast idle cam 7 from the foot 9a of the throttle lever 9, causing the yoke valve 2 to rotate in the direction A and close the yoke valve 2, while the foot 9a engages with the cam surface 7a, opening the throttle valve 3 to a certain degree. The state at this time is shown in FIG.

Next, when the key switch 15 is rotated to conduct to the start terminal 15c, a starter motor (not shown) is started, the engine is started, and idling operation is started with the choke valve 2 closed. When the engine continues to idle and warms up to a certain temperature, timer 1
3 is activated, the electromagnet device 10 is activated, the telescopic rod 10a is extended again, and the throttle lever 9 is rotated in the direction A again. As a result, the cam surface 7a of the fast idle cam 7 and the throttle lever 9
Since the fast idle cam 7 is surely disengaged from the foot 9a of the throttle lever 9, the rotational movement of the fast idle cam 7, which attempts to rotate in the direction opposite to A as the engine warms up, is compensated for, and the foot 9a of the throttle lever 9 is is the cam surface 7b
Or it will engage with the cam surface 7c. Foot portion 9a
is the lower cam surface 7 of the fast idle cam 7
By engaging the throttle levers b and 7c, the opening degree of the throttle lever 3 becomes smaller, so that high-speed idling operation is automatically prevented.

As more specific circuit configuration diagrams of the electric circuit shown in FIG. 3, various examples are shown in FIGS. 4 to 6. Hereinafter, based on FIGS. Examples of various changes to the circuit will be explained. Note that in FIGS. 4 to 6, components with the same reference numerals as those in FIG. 3 indicate components with the same names that perform the same functions.

First, in Figure 4, the characteristic point is the third
PTC thermistor 1 as timer 12 in the diagram
2a as the timer 13 in FIG. 3, a temperature switch 13a and a PTC thermistor 13.
b and connected in series, respectively, are used. The effect is explained as follows. That is, with the handbrake switch or gear neutral switch 14 closed, the key switch 15 is connected to the ignition terminal 15a.
When electrical conduction occurs, the electromagnetic device 10 is energized via the PTC thermistor 12a, and the telescopic rod 10
Since a is extended, the relationship between the fast idle cam 7 and the throttle lever 9 shifts from the state shown in the first figure to the state shown in the second figure, as described in the first embodiment. Here, when the PTC thermistor 12a is energized for a certain period of time, it reaches the Curie point and the resistance increases rapidly, so the current is cut off.
This limits the operating time of the electromagnet device 10 when starting the engine. In this way, preparations for starting idling operation are completed, and the engine is started by further rotating the key switch 15 and conducting to a start terminal (not shown), and idling operation is started. When the engine is warmed up to a certain temperature by idling, the temperature switch 13a detects the water temperature, oil temperature, or intake air temperature and becomes closed, and the PTC thermistor 1
3b, the electromagnetic device 10 is energized, the telescopic rod 10a is extended again, and the fast idle cam 7 is reliably dropped. In this case as well, the PTC thermistor 13b cuts off the current after a certain period of time has elapsed, so that the electromagnet device 10
The operating time is automatically controlled.

Next, the electric circuit shown in FIG. 5 will be explained. In this figure, the timer 12 in FIG.
That is, the so-called bimetal switch 12b-
Further, the timer 13 shown in FIG. 3 is characterized in that a temperature switch 13c and a bimetal switch 13d are connected in series. Here, bimetal switches 12b and 13d
is composed of a rapidly reversing bimetal B and a heater C, which are closed below a certain temperature. To explain the reason, when the key switch 15 is electrically connected to the ignition terminal 15a while the switch 14 is closed, the bimetal switch 1
Since 2b is closed, the electromagnetic device 10 is activated. As a result, the device shown in the first diagram enters the state shown in the second diagram, and the engine is ready to start. Here, since the rapid reversal bimetal B is heated by the heater C and reversed after a certain period of time has elapsed, the bimetal switch 12b is opened, and as a result, the operating time of the electromagnet device 10 at the time of engine starting is limited. Therefore, by further rotating the key switch 15 and connecting it to a start terminal (not shown), the engine starts idling. Then, when the engine is warmed up to a certain temperature, the temperature switch 13c is closed and the electromagnet device 10 is energized via the temperature switch 13c and the bimetal switch 13d, so that the heater C of the bimetal switch 13d suddenly switches to the bimetal B Heat the telescopic rod 10a until it becomes open.
is extended to ensure that the fast idle cam 7 falls.

Finally, the electric circuit shown in FIG. 6 will be explained. The structural feature of this electric circuit is that the ignition terminal 15a of the key switch 15
and the coil 10b of the electromagnet device 10, a handbrake switch 14, a temperature switch 12c,
In addition to interposing a PTC thermistor 12d, the start terminal 15c of the key switch 15 and the coil 10b
It is located at the point where the lines are connected. In the electric circuit shown in FIG. 6, the key switch 15 is connected to the start terminal 15c.
During engine cranking, the electromagnetic device 10 is energized, which opens the throttle valve 3. However, after the engine is started, the key switch 15 is returned to the ignition terminal 15a, so that the state shown in FIG. The temperature switch 12c corresponding to the timer 12 and the PTC thermistor 12d again cause the electromagnet device 10 to operate at a constant temperature for a certain period of time. It goes without saying that the handbrake switch or the gear neutral switch 14 must be closed for the above operation.

As explained above, according to the automatic fast idle device of the present invention, the engagement between the fast idle cam and the throttle lever is automatically released when the engine is started, so starting the engine is extremely easy and reliable. At the same time, there is an effect that complicated operations such as depressing the accelerator pedal at the time of starting the engine are eliminated. Furthermore, after starting the engine, the electromagnetic device operates again when the engine has warmed up to a certain temperature and forcibly disengages the fast idle cam from the throttle lever. It is possible to automatically obtain a throttle opening that is sure to fall and match the warm-up temperature. Therefore, wasteful consumption of fuel can be reliably prevented, and the generation of noise caused by high-speed rotation of the engine can be suppressed to a minimum. Furthermore, in vehicles equipped with a catalytic converter, the effect of eliminating the cause of overheating is also produced. Furthermore, since the electromagnetic device is only allowed to operate when the handbrake is activated or the gear is in neutral, there is no chance that the timer will malfunction while the car is driving and the car will accelerate against the driver's will. This improves safety.

On the other hand, by using the electric circuit shown in FIG. 4, it is possible to reliably produce the above effect with an extremely simple circuit configuration.

Further, by using the electric circuit shown in FIG. 5, it is possible to prevent the operating time of the timer from changing depending on the load.

Furthermore, by using the electric circuit shown in Figure 6, one timer can be omitted compared to the electric circuits shown in Figures 3 to 5, so it can be constructed at the lowest cost and has high operational reliability. This effect is produced.

[Brief explanation of the drawing]

Fig. 1 is a front view of the automatic fast idle device of the present invention before the engine is restarted, Fig. 2 is a front view of the automatic fast idle device of the present invention immediately after the engine is started, and Fig. 3 is a front view of the automatic fast idle device of the present invention. Fig. 4 is a more specific electrical circuit diagram of the electrical circuit diagram shown in Fig. 3.
FIGS. 5 and 6 each show other electrical circuit diagrams. 1... Carburetor body, 2... Cheyoke valve, 3
...Throttle valve, 5...Thermosensitive expansion body, 7...
...Fast idle cam, 9...Throttle lever, 9a...Foot part, 9b...Rod contact part, 10
...Electromagnetic device, 10a... Telescopic rod, 12,
13...Timer, 15...Key switch, 16...
…power supply.

Claims (1)

[Scope of utility model registration request] A fast idle cam that rotates in conjunction with the expansion and contraction movement of the heat-sensitive expansion body is attached to the carburetor body, and a throttle lever that rotates integrally with the throttle valve is arranged to be freely engageable and detachable from the fast idle cam. In the automatic fast idle device, an electromagnet device is disposed on one side of the throttle lever, a rod abutting portion is formed on the throttle lever, and a telescopic rod of the electromagnetic device is opposed to the rod abutting portion. The throttle lever is rotated in the opening direction by extension of the telescoping rod, and the throttle lever and the fast idle cam are disengaged from each other. A timer is installed in parallel with a timer that extends the telescopic rod by allowing electricity to be applied for a certain period of time when the electromagnetic device reaches a certain temperature during engine warm-up, and these timers are also connected to a key switch of the automobile. An automatic fast idle device characterized in that a switch is connected to the circuit and is closed only when a handbrake is engaged or a gear is in neutral.