JPH0557342U - Vaporizer automatic starter - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Automatically and properly control the choke valve and throttle valve during start-up and warm-up operation to simplify engine startup and smooth warm-up operation. To do. [Composition] Thermo wax 14 that expands and contracts according to engine temperature
An operating lever 8 that is rotated by is provided. Further, the choke valve 5 is biased in the closing direction to synchronize with the operating lever 8 and engages with the operating lever 8 so that it can be opened by a predetermined opening degree. Also, the throttle valve 4 is interlocked with the operating lever 8 to adjust the first idle opening degree. Further, by providing a choke opener that operates by the intake negative pressure after the engine is started and rotates the choke valve 5 in the opening direction, the choke valve 5 is opened by the above-mentioned fixed opening after the engine is started.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an automatic carburetor starter which automatically controls the opening of a choke valve and the first idle opening of a throttle valve when the engine starts.

[0002]

[Prior Art]

 Conventionally, in the above carburetor, a thermowax is connected to a choke valve so that the choke valve opens when the engine temperature rises, and the rotation of the choke valve is transmitted to a throttle valve by a cam so that the first idle opening degree is increased. Have been configured to control. (See JP-A-60-219441)

[0003]

[Problems to be solved by the device]

 In the above conventional carburetor, the choke valve and throttle valve are controlled by a single thermowax, which is low cost and highly practical.However, since the choke valve is controlled by thermowax only, The choke valve is only controlled in a single manner in response to the temperature, and the optimum air-fuel mixture is not necessarily supplied in response to the engine start-up and warm-up operation conditions. There was a drawback that resulted in poor warm-up operation.

The present invention provides a carburetor that automatically and properly controls a choke valve and a throttle valve at the time of starting and warming up to simplify the starting of the engine and smooth the warming up. The purpose is to

[0005]

[Technical means for solving problems]

 The carburetor according to the present invention includes an operating lever that is connected to a thermowax that expands and contracts according to the engine temperature and that rotates, and an activating lever that is constantly biased in the closing direction to rotate integrally with the operating lever. On the other hand, a choke valve that is engaged so that it can be opened by a fixed opening, a throttle valve that is linked to the operating lever and whose first idle opening is adjusted according to this rotation, and intake negative pressure after engine start It is characterized by having a choke opener for rotating the choke valve in the opening direction.

[0006]

[Action]

 According to the above means, before starting the engine, the thermowax expands according to the ambient temperature of the engine, and the choke valve opening and the first idle opening of the throttle valve are adjusted optimally for starting at this temperature. There is. When the choke opener operates due to an increase in intake negative pressure after the engine is started, the choke valve is opened by the above-mentioned certain degree of opening, and as a result, the concentration of the air-fuel mixture is slightly diluted and the warm-up operation is smoothly performed. When the thermowax gradually expands as the engine warms up, the operating lever is rotated and the choke valve is gradually opened, and at the same time the throttle valve is closed. When the engine is completely warmed up, the thermowax is fully expanded, the choke valve is fully opened, the throttle valve is closed to the idle opening, and the normal operation state is entered.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 (A) is a side view showing one side of the vaporizer of the present invention, and FIG. 1 (B) is a side view showing the other side of the vaporizer of the present invention.

Reference numeral 1 is a vaporizer main body. An intake passage 2 is provided through the main body 1, and a throttle valve 4 is arranged downstream of the venturi 3 and a choke valve 5 is arranged upstream of the intake passage 2. A first choke lever 7 is fixed to one outer end of a choke shaft 6 of the choke valve 5, and an operating lever 8 is rotatably fitted to the choke valve 6. Further, the operating lever 8 is formed with locking pieces 10 and 11 for restricting the rotation of the choke lever 7, and the operating lever 8 and the choke lever 7 are interlocked with a certain degree of play. Further, the choke valve 5 is always biased toward the closing side and abuts on the locking piece 10 on the one side, and is synchronized with the operating lever 8. Further, the operation lever 8 is connected to a thermowax 14 which expands and contracts according to the engine temperature, so that the choke valve 5 is controlled by the thermowax 14 in accordance with the engine temperature.

The thermowax 14 is arranged in a wax case 15 by pressing the other end of a member 18 having good thermal conductivity whose one end is in contact with the engine 17 into the wax case 15. A piston 19 that is linearly moved according to the expansion and contraction of the wax body 16 is arranged, and a retainer 20 connected to the operating lever 8 is biased by a spring 21 and pressed against the piston 19. In addition to the heat input to the wax main body 16 via the member 18 having good heat conductivity as in this embodiment, the heat input at the engine temperature is made possible by directly contacting the wax main body 16 with the engine 17. Of course, it is possible to obtain it.

On the other hand, a second choke lever 23 is fixed to the other outer end of the choke shaft 6, and a choke opener 24, which operates with intake negative pressure after the engine is started, is connected to the choke lever 23. After the engine is started by the choke opener 24, the choke valve 5 is rotated in the opening direction, and the first choke lever 7 is opened until it abuts on the other locking piece 11 of the operating lever 8. In the choke opener 24, a diaphragm 26 is stretched in a casing 25, a negative pressure chamber 27 is provided on one side of the diaphragm 26, and an atmospheric chamber 28 is provided on the other side, and the diaphragm 26 is provided on the atmospheric chamber 28 side. It is a negative pressure actuated actuator which is generally used from the past, which is constructed by attaching a projecting rod 29 and connecting the rod 29 to the second choke lever 23.

A first throttle lever 32 is fixed to the outer end of the throttle shaft 31 of the throttle valve 4 protruding toward the operating lever 8, and the throttle lever 32 is engaged with the cam portion 9 of the operating lever 8 described above. Accordingly, the fast idle opening of the throttle valve 4 is adjusted as the operation lever 8 is rotated by the thermowax 14. Further, a second throttle lever 33 is fixed to the other outer end of the throttle shaft 31, and a vane 34 for urging the throttle valve 4 toward the closing side is arranged on the throttle lever 33. Further, the carburetor main body 1 is provided with an idle adjusting screw 35 that comes into contact with the second throttle lever 33 and adjusts an idle opening degree.

Next, the operation of the above embodiment will be described. Before the engine is started, the thermowax 14 is stretched in accordance with the temperature of the engine atmosphere, and the opening of the choke valve 5 and the first idle opening of the throttle valve 4 are optimally adjusted for starting at this temperature. After the engine is started, when the choke opener 24 is actuated due to the increase in the intake negative pressure, the choke valve 5 is opened by a fixed opening until the first choke lever 7 contacts the other locking piece 11 of the actuating lever 8. As a result, the air-fuel mixture concentration is slightly diminished, and warm-up operation is performed smoothly. When the thermowax 14 gradually expands as the engine warms up, the operating lever 8 is rotated to gradually open the choke valve 5 and at the same time close the throttle valve 4. When the engine is completely warmed up, the thermowax 14 is fully expanded, the choke valve 5 is fully opened, the throttle valve 4 is closed to the idle opening degree, and the normal operation state is entered.

[0013]

[Effect of the device]

 As described in detail above, according to the present invention, an operating lever that is connected to a thermowax that expands and contracts according to the engine temperature and that is rotated, and that is always biased in the closing direction and that is integrally rotated with the operating lever. At the same time, a choke valve that can be opened to a certain opening with respect to the operating lever, a throttle valve that is interlocked with the operating lever and adjusts the first idle opening according to this rotation, and a By including a choke opener that rotates the choke valve in the opening direction by the intake negative pressure, the choke valve opening and the fast idle opening of the throttle valve are controlled according to the engine ambient temperature, and after starting the engine, The choke opener opens the choke valve by a certain opening to dilute the concentration of the air-fuel mixture, and further opens the choke valve as the warm-up progresses. In both cases, the throttle valve is returned from the fast idle opening, so the choke valve and throttle valve are properly and automatically controlled when the engine is started, so that the start is easy and satisfactory and the warm-up operation is smooth. I can.

[Brief description of drawings]

FIG. 1 (A) is a side view showing one side surface of a vaporizer of the present invention.

FIG. 1 (B) is a side view showing the other side surface of the vaporizer of the present invention.

[Explanation of symbols]

 1 Vaporizer body 2 Intake passage 4 Throttle valve 5 Choke valve 8 Actuating lever 14 Thermowax 24 Choke opener

Claims (1)

[Scope of utility model registration request] 1. An operating lever that is connected to a thermowax that expands and contracts according to the engine temperature and is rotated, and is constantly biased in a closing direction and is integrally rotated with the operating lever and is constant with respect to the operating lever. A choke valve that is engaged so that it can be opened only by the opening, a throttle valve that is interlocked with the operating lever and whose first idle opening is adjusted in accordance with this rotation, and a choke valve that uses intake negative pressure after engine startup. An automatic starter for a carburetor, comprising: a choke opener that rotates in the opening direction.