JPH0552128A - Engine control device - Google Patents

Abstract

PURPOSE:To contrive improvement of noise and fuel consumption by weakening tension of a governor spring to moderately decrease an engine speed during warming up operation smaller than that at the time of high speed operation when a control lever is turned to a choke fully closed position beyond a high speed operation position. CONSTITUTION:A control lever 8 and an intermediate lever 9 rotatably supported to a base board 7 are resiliently connected by a lost motion spring 17. A governor spring 18 of increasing tension, when the control lever 8 is turned to a high speed position H from an engine stop position S, is connected to this intermediate lever 9. An arm 11c for pressing back the intermediate lever 9 to a side of a low speed operation position L, when a choke actuating lever 11 is driven by turning the control lever 8 to a choke fully closed position C beyond the high speed operation position H, is provided in the choke actuating lever 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a governor lever connected to a throttle valve of a carburetor mounted on an engine, a governor spring for giving the lever a control force in the opening direction of the throttle valve, a low speed operation position, It is pivotally supported on the board so that it can be sequentially rotated to the high-speed operating position and the choke fully closed position.
A control lever that increases the control force of the governor spring as it rotates from the low speed operation position toward the high speed operation position,
A centrifugal governor that gives a governor lever a control force that increases in accordance with an increase in the engine speed in the closing direction of the throttle valve, and is connected to a choke valve of a carburetor that is pivotally supported by a substrate.
An engine provided with a choke operating lever that is spring-biased in the opening direction of the valve, and when the control lever rotates beyond a high-speed operating position, the lever drives the choke operating lever to close the choke valve. Regarding the control device.

[0002]

2. Description of the Related Art In such an engine control device, when the control lever is rotated beyond the high speed operation position to the choke fully closed position side in order to close the choke valve when starting the engine at the time of cold engine, the control force of the governor spring is applied. It is desirable not to increase more than necessary. If the control force of the governor spring increases more than necessary, the engine speed will increase more than necessary during warm-up operation of the engine, resulting in an inconvenience that noise and fuel consumption increase.

Therefore, in a conventional engine control device, as disclosed in, for example, Japanese Patent Publication No. 2-48738, a control lever and an intermediate lever which are elastically connected to each other by a spring are respectively attached to a fixed base plate. While supporting it, connect a governor spring to the intermediate lever so that the control lever can adjust the control force of the governor spring via the intermediate lever. It is known that the base plate is provided with a stopper that keeps only the intermediate lever in the high-speed operation position when turning to, and suppresses further increase of the governor spring.

[0004]

However, even in such a conventional engine control device, the control force of the governor spring when the choke valve is closed by the control lever has a value equal to that when the control lever occupies the high speed operation position. However, it is still too large as a value for controlling the engine speed during warm-up operation.

The present invention has been made in view of such circumstances, and when the choke valve is closed by the control lever, the control force of the governor spring is determined from the control force of the governor spring when the control lever occupies the high speed operation position. It is also an object of the present invention to provide the engine control device in which the engine speed during warm-up operation is appropriately maintained by reducing the above.

[0006]

In order to achieve the above object, the present invention provides a control lever and a governor spring between a control lever and a governor spring.
A governor spring weakening means for weakening the control force of the governor spring as the control lever drives the choke actuating lever is provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

First, the first embodiment shown in FIGS. 1 to 5 is started. In FIG. 1, an intake passage 2 of a carburetor 1 attached to an intake system of an engine has a choke valve 3 on the upstream side and a throttle valve 4 on the downstream side with a central venturi portion 2a interposed therebetween.
Is provided. These choke valve 3 and throttle valve 4
Is a butterfly type, and a choke lever 5 and a throttle lever 6 are fixed to the outer ends of the respective valve shafts supported by the pipe wall of the intake passage 2.

On the other hand, a control lever 8 and an intermediate lever 9 are rotatably attached to a base plate 7 fixed to an engine body (not shown) by a common pivot shaft 10, and the pivot shaft 10 is also provided.
A choke actuating lever 11 is pivotally mounted by a pivot 12 at a location remote from.

The control lever 8 includes a long arm 8a, a short arm 8b extending in the opposite direction, an operating arm 8c protruding from one side of the short arm 8b, and a locking piece 8 protruding from one side of the long arm 8a.
The engine control panel 1 has a long arm 8a.
An operation knob 14 slidably supported by 3 is connected via a wire 15. By pulling the operation knob 14, the control lever 8 is rotated clockwise in FIG. 1 to the engine stop position S, the low speed operation position L, the high speed operation position H, and the choke fully closed position C. The return spring 16 biases the engine stop position S side.

The intermediate lever 9 is arranged above the control lever 8 so as to extend toward the short arm 8b thereof, and one side of the intermediate lever 9 abuts on one side surface of the long arm 8a in a separable manner.
(See also FIG. 3) and a locking piece 9b facing the locking piece 8d are formed, and the stopper piece 9 is provided on the other side.
c is formed. Further, an engaging pin 9d is provided so as to project from the tip of the intermediate lever 9. Then, both ends of the lost motion spring 17, which is a tension coil spring, are locked between the locking pieces 8d and 9b, and the tension of the lost motion spring 17 causes the contact piece 9a to contact one side surface of the long arm 8a. The control lever 8 and the intermediate lever 9 are connected to each other. Lost motion spring 17
Is applied with a set load larger than the maximum tension of the governor spring 18 described later.

Thus, the engine stop position S of the control lever 8 is regulated by the stopper piece 9c of the intermediate lever 9 abutting on one side edge of the substrate 7, and the high speed operation position H.
Is regulated by the contact of the intermediate lever 9 with the first stopper bolt 19 screwed to the board 7 (see also FIG. 2), and the choke fully closed position C is the second stopper screwed to the board 7. It is regulated by the short arm 8b of the control lever 8 coming into contact with the bolt 20.

A governor lever 21 having three arms 21a to 21c is rotatably attached via a pivot 22 to an engine body (not shown). This governor lever 21
The first arm 21a is connected to the throttle lever 6 via a link 23, and a governor spring 18 is stretched between the second arm 21b and the intermediate lever 9. The governor spring 18 applies a torque T _S in the opening direction of the throttle valve 4 to the second arm 21b due to its tension. Third arm 21
c is connected to a known centrifugal governor 24 driven by a rotating shaft (not shown) of the engine, and a torque T _G that increases in accordance with an increase in the engine speed of the centrifugal governor 24 is applied to the throttle valve 4. Receive in the closing direction.

The choke operating lever 11 has three arms 1.
1a to 11c, and the first arm 11a thereof is connected to the choke lever 5 via a link 25. Second
The arm 11b is arranged so as to face the short arm 8b of the control lever 8, and when the control lever 8 moves beyond the high speed operation position H to the choke fully closed position C side, the short arm 8b closes the choke valve 3. It is designed to be driven in the direction. Third arm 1
1c is arranged to face the engaging pin 9d of the intermediate lever 9, and when the choke operating lever 11 rotates to close the choke valve 3, the intermediate lever 9 is moved to the governor spring 18a.
It is designed to push back to the tension decreasing side.

A return spring 26 is connected to the choke actuating lever 11 to urge the choke operating lever 11 toward the opening direction of the choke valve 3.

In the above, the intermediate lever 9, the lost motion spring 17, the third arm 11 of the choke operating lever 11
c is the governor spring 18 when the choke valve 3 is closed.
Governor spring weakening means 27 of the present invention for reducing the tension of the
Make up.

Next, the operation of this embodiment will be described.

As long as the control lever 8 is rotated in the range from the engine stop position S to the high speed operation position H by pushing and pulling the operation knob 14, the intermediate lever 9 connected to the control lever 8 by the strong lost motion spring 17 is also included. Since the governor spring 18 expands and contracts by rotating together with the control lever 8, tension can be applied to the governor spring 18 in proportion to the rotation angle of the control lever 8 from the engine stop position S. For example, as shown in FIG. 4, when the control lever 8 is rotated to the high speed operation position H, a large tension corresponding to the position is applied to the governor spring 18.

If the engine is operated in such a state,
Since the centrifugal governor 24 applies a torque T _G according to the engine speed to the governor lever 21, the lever 21 rotates so as to balance the torque T _G with the torque T _S due to the large tension of the governor spring 18. As a result, the throttle valve 4 is controlled in the high opening range, and the engine continues to operate at high speed.

Next, when starting the engine in the cold state,
When the control knob 8 is fully pulled to rotate the control lever 8 to the choke fully closed position C as shown in FIG. The lever 9 comes into contact with the first stopper bolt 19 and is prevented from rotating further integrally with the control lever 8, and the operating arm 8c of the control lever 8 is connected to the second arm 11b of the choke operating lever 11. The third arm 11c of the choke actuating lever 11 occupies the position just before contact with the intermediate lever 9. Therefore, the control lever 8 moves to the high-speed operating position H.
When it is rotated beyond, the lost motion spring 17 is extended, the control lever 8 is separated from the contact piece 9a of the intermediate lever 9, and the operating arm 8c of the control lever 8 moves the second arm 11b of the choke operating lever 11. When the lever 11 is pressed to rotate the choke valve 3 in the closing direction and the control lever 8 comes into contact with the second stopper bolt 20, the choke valve 3 is fully closed. Therefore, if the engine is cranked, the rich mixture is supplied from the carburetor 1 to the combustion chamber of the engine, and the cold start can be easily performed.

When the control lever 8 rotates the choke operating lever 11 to close the choke valve 3 as described above, the third arm 11c of the choke operating lever 11 causes the engaging pin 9d of the intermediate lever 9 to move. The lever 9 is pressed to push it back to the low speed operation position L side and move away from the first stopper bolt 19. Thus, the tension of the governor spring 18 is
Since the control lever 8 is corrected to be smaller than that when it occupies the high-speed operation position H, the engine speed during warm-up operation is suppressed appropriately lower than that during high-speed operation to reduce noise and fuel consumption. be able to.

Next, the second embodiment of the present invention shown in FIGS.
Examples will be described.

In FIG. 6, the control lever 8 is provided on the substrate 7.
And the choke actuating lever 11 is mounted on a common pivot 30. The control lever 8 has three arms 8e to 8g, a wire 15 connected to the operation knob 14 is connected to the first arm 8e, and a bell crank type intermediate lever 9 is connected to the second arm 8f.
Are attached by a pivot 31. The control lever 8 and the intermediate lever 9 are abutting pieces 8h and 9h that come into contact with each other so as to be separated from each other
The lost motion spring 17 is stretched between the third arm 8g of the control lever 8 and the first arm 9e of the intermediate lever 9 so as to maintain these contact states.

The engine stop position S of the control lever 8 is regulated by the contact piece 8h contacting the stopper 32 standing on the substrate 7, and the control lever 8 is biased toward the engine stop position S. Return spring 16 is the third arm 8g
Connected to.

A stopper bolt 33 is screwed onto the second arm 9f of the intermediate lever 9, and this stopper bolt 33
Is brought into contact with the stopper surface 34 formed on the substrate 7, whereby the high-speed operating position H of the control lever 8 is regulated. A governor spring 18 is connected to the intermediate lever 9 and the second arm 9f on the tip side of the stopper bolt 33, and the lost motion spring 17 is connected to the governor spring 1.
A set load larger than the maximum tension of 8 is applied.

The choke actuating lever 11 is formed in a bell crank shape having two arms 11e and 11f, a long arm 11e, a link 25 connected to the choke lever 5, and a short arm 11f. The control lever 8 is arranged so as to face the contact piece 8i formed on the third arm 8g. The choke actuating lever 11 is designed to rotate between the full-open stopper 35 and the full-close stopper 36 on the board 7, and the return spring 26 causes the full-open stopper 3 to rotate.
5 is urged in the contact direction.

The other structure is almost the same as that of the previous embodiment.
In the figure, parts corresponding to those in the previous embodiment are designated by the same reference numerals.

Then, when the control lever 8 is rotated from the engine stop position S toward the high speed operation position H as shown in FIG. 8, the intermediate lever 9 is also rotated together with the control lever 8 and the amount of rotation is changed. A proportional tension can be applied to the governor spring 18.

Next, when the control lever 8 is rotated beyond the high-speed operating position H to the choke fully closed position C, the contact piece 8i of the control lever 8 pushes the short arm 11f of the choke actuating lever 11 to cause the lever. 11 is driven to the closing side of the choke valve 3,
The long arm 11e of the lever 11 is a full-closed stopper 3 on the substrate 7.
When it comes into contact with 6, the choke valve 3 is fully closed.

On the other hand, since the intermediate lever 9 brings the stopper bolt 33 into contact with the stopper surface 34 of the substrate 7 when the control lever 8 reaches the high speed operation position H, the control lever 8 exceeds the high speed operation position H and chokes. When rotating to the fully closed position C,
As shown in FIG. 9, as the pivot shaft 31 of the intermediate lever 9 moves in an arc, the intermediate lever 9 extends the lost motion spring 17 around the tip of the stopper bolt 33 that is in contact with the stopper surface 34 as a fulcrum. Turn to. By this rotation, the tip portion of the second arm 9f of the intermediate lever 9 is displaced to the governor lever 21 side, so that the tension of the governor spring 18 connected to the tip portion is weakened. Therefore,
The engine speed during warm-up operation can be suppressed to an appropriate degree compared to that during high-speed operation.

In this second embodiment, the intermediate lever 9,
The lost motion spring 17, the stopper bolt 33, and the stopper surface 34 constitute the governor stopper weakening means 27 of the present invention.

[0032]

As described above, according to the present invention, the governor spring weakening means for weakening the control force of the governor spring as the control lever drives the choke operating lever is provided between the control lever and the governor spring. When the choke valve is closed by the control lever, the governor spring control force can be corrected to a value lower than that during high-speed operation, and the engine speed during warm-up operation can be reduced appropriately, resulting in engine noise and fuel consumption. Can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of an engine control device according to a first embodiment of the present invention, showing an engine stopped state.

FIG. 2 is a view on arrow 2 of FIG.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is an explanatory diagram of a high-speed operation state of the engine control device.

FIG. 5 is an explanatory view of the choke fully closed state of the engine control device.

FIG. 6 is a plan view of the engine control apparatus according to the second embodiment of the present invention, showing the engine stopped state.

7 is a sectional view taken along line 7-7 of FIG.

FIG. 8 is a plan view for explaining the high-speed operation state of the engine control device.

FIG. 9 is an explanatory view of the choke fully closed state of the engine control device.

[Explanation of symbols]

 1 Vaporizer 3 Choke valve 4 Throttle valve 8 Control lever 9 Intermediate lever 10 Axis 11 Choke actuating lever 17 Lost motion spring 18 Governor spring 21 Governor lever 24 Centrifugal governor 27 Governor spring C Choke fully closed position H High speed operation position S Low speed operation position S Engine stop position

Claims (1)

[Claims] 1. A governor lever (21) connected to a throttle valve (4) of a carburetor (1) mounted on an engine.
And a governor spring (18) that gives a control force to the lever (21) in the opening direction of the throttle valve (4), a low speed operation position (L), a high speed operation position (H), and a choke fully closed position (C). A control that is pivotally supported by the substrate (7) so that the governor spring (18) can be sequentially rotated in the direction from the low speed operation position (L) to the high speed operation position (H), and the control force of the governor spring (18) is increased. The centrifugal governor (2) that gives the lever (8) and a control force that increases in accordance with an increase in the engine speed in the direction of closing the throttle valve (4) to the governor lever (21).
4) and a choke actuating lever (11) which is pivotally supported by the base plate (7) and is connected to the choke valve (3) of the carburetor (1) and which is spring-biased in the opening direction of the valve (3). Engine control in which the lever (8) drives the choke actuating lever (11) to close the choke valve (3) when the control lever (8) rotates beyond the high-speed operating position (H). In the device, between the control lever (8) and the governor spring (18),
An engine control device comprising a governor spring weakening means (27) for weakening the control force of the governor spring (18) as the control lever (8) drives the choke operating lever (11).