JP2884784B2 - 2-stage speed control type mechanical governor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical governor in which the number of revolutions of a vehicle engine when idling and when an accelerator pedal is fully opened is adjusted in two levels, high and low.

[0002]

2. Description of the Related Art In general, a mechanical governor mechanism is known as a means for adjusting the number of revolutions of a vehicle engine when idling and when an accelerator pedal is fully opened (refer to the 1989 model of the Nissan Forklift GX Series Maintenance Manual). ).

[0003] The mechanical governor comprises a first lever interlocked with an accelerator pedal and a second lever interlocked with the first lever, which are rotatably arranged on the governor main body. The connecting rod connected to the lever is connected to the opening / closing mechanism of the throttle valve, and the first and second levers are connected using a governor spring and a link, and further through a governor pulley provided on the governor body. A flyball that rotates by an appropriate angle due to the centrifugal force generated by the rotation of the engine is provided, and the second control lever is operated in conjunction with the flyball.
The opening angle of the throttle valve when the accelerator pedal is fully opened is determined by restricting the rotation angle of the lever. The first lever is provided with a return spring for returning the accelerator pedal, and an adjust mechanism for adjusting the opening of the throttle valve is provided between the second lever and the control lever.

[0004] Further, there has been attempted means for regulating the movement of a first lever used in the mechanical governor to adjust the rotation speed of the vehicle engine when the accelerator pedal is fully opened in two levels, high and low. As an example of such a means, a stopper mechanism capable of adjusting the rotation angle of the first lever in two stages is provided near the first lever,
With the switching of the stopper mechanism, the magnitude of the rotation angle of the first lever when the accelerator pedal is fully opened is switched in two stages to determine the opening degree when the accelerator pedal is fully opened.

[0005]

However, in such a conventional two-stage switching governor, the movement of the first lever interlocking with the accelerator pedal is regulated by a stopper mechanism which can be adjusted in two stages. However, when the engine speed is adjusted to a low speed and when the engine speed is adjusted to a high speed, the depression stroke of the accelerator pedal is different, which gives a sense of incongruity to the driver, and also has a difficulty in the operability of the accelerator pedal. There was a problem that occurs.

That is, when switching from low rotation to high rotation, the depression stroke of the accelerator pedal becomes large, so that the operational burden on the driver increases. Conversely, when switching from high rotation to low rotation is performed. In addition to the feeling that the accelerator pedal is pushed back, the accelerator wire connecting the accelerator pedal and the first lever is easily loosened, and the operability may be reduced.

Accordingly, the present invention solves such a problem of the conventional governor, and has no effect on the depression stroke of the accelerator pedal and can switch the engine speed between high and low levels. It is intended to provide governors.

[0008]

The present invention SUMMARY OF THE INVENTION To achieve the above object, disposed so as to be rotatable governor body, a first lever in conjunction with an accelerator pedal, the governor body
Rotatably mounted on the throttle valve opening / closing mechanism
A second lever connected to the first and second levers ;
Engage with one lever and provided on the other lever
Link the link that engages with the long hole with the first and second levers
A governor spring which forms an, provided to the governor main body, rotated by an appropriate angle by a centrifugal force based on rotation of the engine that will be input via the governor pulley, maximum of the second lever
A control lever that determines the opening of the throttle valve when the accelerator pedal is fully opened by limiting the rotation angle of the second lever by restricting the rotation position
If, provided between the control lever and the governor body
And the tension of the turning power adjusting spring of the control lever and the turning power adjusting spring is adjusted in two stages of high and low.
Rotation is provided a tension switching mechanism comprising a solenoid Number 2
It has a stage control type mechanical governor configuration.

[0009]

According to the above construction, when the rotation speed of the vehicle engine during idling and when the accelerator pedal is fully opened is set at a low speed, the tension switching mechanism is constituted.
By switching the tension of the turning power adjustment spring to “low” by the solenoid, the movement of the first lever when the accelerator pedal is fully opened can be controlled by the link and governor spring.
Transmitted to the second lever via a grayed, when the throttle valve is fully opened from the second lever through an opening and closing mechanism of the throttle valve, the control lever is driven by the centrifugal force caused by the rotation of the engine Rotates in the direction of pushing back the second lever, that is, in the direction of closing the throttle valve, so that the engine speed when the accelerator pedal is fully opened is suppressed to a preset low value.

When the engine speed at idling and when the accelerator pedal is fully opened is set to a high speed, the tension of the turning power adjusting spring is switched to "high" by a solenoid constituting a tension switching mechanism. As described above, when the accelerator pedal is fully opened, the movement of the first lever is controlled via the link and the governor spring.
When the throttle valve is fully opened from the second lever via the throttle valve opening and closing mechanism , the centrifugal force generated by the rotation of the engine causes
The movement of the driven control lever is canceled by the tension of the turning power adjusting spring, and therefore, the angle by which the control lever pushes back the second lever becomes small, and the turning angle of the second lever in the direction to close the throttle valve is also reduced. As a result, the opening of the throttle valve is inevitably increased, and the engine speed increases when the accelerator pedal is fully opened.

[0011]

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
One embodiment of a stage control type mechanical governor will be described .

In the configuration shown in FIG. 1, reference numeral 1 denotes a governor main body, and the governor main body 1 incorporates a flyball (not shown) which rotates by an appropriate angle by centrifugal force when receiving the rotational force of the engine. A governor shaft 3 driven by the flyball is provided in a protruding manner. One end of a control lever 5 is fitted and fixed to the governor shaft 3. Therefore, the control lever 5 rotates in conjunction with the governor shaft 3.

An elongated hole 5a is opened at the other end of the control lever 5, and a spring force adjusting bolt 7 is fitted and fixed in the elongated hole 5a. Rod 9 fixed in 5a
The turning power adjusting spring 1 of the control lever 5
1 is connected to the end of the power adjusting spring 1
The other end of 1 is connected to the operating rod 13 a of the solenoid 13. The body of the solenoid 13 is fixed to the governor body 1.

Reference numeral 55 denotes a power supply for driving the solenoid 13;
Is a manual switch, and the operation of the solenoid 13 is turned on / off by operating the manual switch 57.

The above-mentioned solenoid 13, power supply 55 and manual switch 57 constitute a tension switching mechanism 60 for the turning power adjusting spring 11.

In this embodiment, a pull-type solenoid is used as the solenoid 13, and when a drive current is applied to the solenoid 13, the operating rod 13a projecting in a normal state is drawn into the solenoid 13 side. Operate.

Reference numeral 33 denotes a first lever rotatably attached to the governor main body 1 about a shaft 35 as a center of rotation.
One end 33a of the first lever 33, that is, one end 37a of an accelerator wire 37 is connected to an upper end in the drawing, and the other end 37b of the accelerator wire 37 is connected to an accelerator pedal 39. . In the illustrated example, the accelerator wire 37 is set to be pulled leftward when the accelerator pedal 39 is depressed.

Reference numeral 43 denotes a return spring for pulling back the accelerator wire 37 to the right side in the drawing. A hook formed at one end 43a of the return spring 43 has a support bracket 45 provided on the upper part of the first lever 33. And the other end 43 of the return spring 43
b is fixed to a support member 54 integrated with the governor body 1.

On the other hand, reference numeral 15 denotes a second lever which is rotatably attached to the governor main body 1 about the governor shaft 3 as a center of rotation.
a, that is, at the upper end in the figure, one end 17a of the connecting rod 17 is pivotally supported.
7b is supported by one end 21a of the bell crank 21. Reference numeral 23 denotes an adjust nut provided in the middle of the connecting rod 17.

The other end 21b of the bell crank 21 has one end 25a of a connecting rod 25 for opening and closing the throttle.
Is supported. Reference numeral 27 denotes a carburetor, and a throttle valve 29 disposed in the carburetor 27 is driven to open and close by the operation of the connecting rod 25 and the link 26. In the illustrated example, the throttle valve 29 is set to be fully opened when the connecting rod 17 moves largely to the left.

The above connecting rod 17 and bell crank 2
1, a connecting rod 25 and a link 26 constitute a throttle valve opening / closing mechanism.

An adjusting bolt 31 is provided at an appropriate position on the lower side of the second lever 15, and the control lever 5 corresponding to the adjusting bolt 31 has a receiving seat 5.
b is provided. The tip 31a of the adjusting bolt 31 is configured to abut the seat 5b when the throttle valve 29 is fully opened.

Further, a governor spring 41 is disposed between the other end 33b of the first lever 33 and the other end 15b of the second lever 15.

Reference numeral 47 denotes a link connecting the first lever 33 and a substantially intermediate portion of the second lever 15, and one end 47 a of the link 47 is fixed to the first lever 33. Is fitted in an elongated hole 49 opened to the second lever 15. This long hole 49
Is formed in such a manner as to allow the second lever 15 to rotate clockwise in the direction in which the throttle valve 29 is closed in the illustrated state.

The link 47 is connected to the first and second levers 3.
With respect to the governor shaft 3 and the shaft 35, which are the centers of rotation of the governors 3, 15, the governor spring 41 is located on the opposite side.

Reference numeral 51 denotes a governor pulley which receives the rotation of the engine (not shown) by a V-belt. The rotational force of the engine transmitted to the governor pulley 51 is transmitted to the fly ball built in the governor body 1 as described above. The governor shaft 3 is rotated by an appropriate angle by the centrifugal force of the ball.

Numeral 53 denotes an adjusting bolt as a stopper which is inserted into the supporting member 54 integral with the governor main body 1, between an end 53 a of the adjusting bolt 53 and the other end 33 b of the first lever 33. The maximum value of the counterclockwise rotation of the first lever 33 is regulated by appropriately adjusting the distance of the first lever 33.

The operation of this embodiment having such a configuration will be described below.

First, when the rotational speed of the vehicle engine during idling and when the accelerator pedal is fully opened is set to a low speed, the manual switch 57 constituting the tension switching mechanism 60 is set to the "low" side, in the illustrated example, off. Switch to side .
Then blocked and the solenoid 13 and power supply 55, Ri the solenoid 13 Do the non-driving condition, the tension of該回power adjustment spring 11 by the operating rod 13a is protruding rotating force adjusting spring 11 of the control lever 5 It becomes smaller. In the case of this embodiment, the turning power adjusting spring 11 is set to have a substantially free length.

At this time, the state in which the accelerator pedal 39 is not depressed is set as an arbitrary low speed during engine idling. This idling rotation speed can be adjusted by turning the adjustment nut 23.

When the accelerator pedal 39 is fully depressed and depressed, the movement of the accelerator pedal 39 is transmitted to the first lever 33 via the accelerator wire 37, and
Lever 33 is rotated about the shaft 35 as the rotation center to the maximum in a counterclockwise direction. Since the movement of the first lever 33 is transmitted to the second lever 15 via the governor spring 41 and the link 47 , the second lever 15 also rotates to the maximum counterclockwise direction. As a result, the connecting rod 17 pivotally supported by one end 15a of the second lever 15 moves to the left as much as possible, and the movement of the connecting rod 17 is transferred via the bell crank 21, the connecting rod 25 and the link 26 to the The signal is transmitted to the throttle valve 29 in the valve 27 and the throttle valve 29 is fully opened. And the second
Stops at a position where the lever 15 equilibrates with the tension applied to the governor spring 41, and this position becomes the fully open position of the throttle valve 29. At this time, the rotation speed of the governor pulley 51 driven by the engine also increases. So
A centrifugal force is generated in the flyball built in the governor body 1. On the other hand, since the control lever 5 rotates clockwise around the governor shaft 3 by centrifugal force, the governor shaft 3 and the control lever 5 rotate clockwise in the drawing by this centrifugal force. Then, a receiving seat 5b provided on the control lever 5 abuts against a tip portion 31a of the adjusting bolt 31, and the second lever 1 is moved through the adjusting bolt 31.
5 is rotated back, that is, the throttle valve 29 is closed.

Therefore, the rotation speed of the engine when the accelerator pedal 39 is fully opened is suppressed to a preset low value by turning the control lever 5 clockwise.

The maximum rotation angle of the first lever 33 at this time is determined by the adjustment bolt 5 inserted into the support member 54.
3 can be regulated by appropriately adjusting the distance between the distal end portion 53a and the first lever 33.

Next, a description will be given of the operation in the case where the rotational speed of the vehicle engine is set to a high speed during idling and when the accelerator pedal is fully opened.

At this time, the manual switch 57 constituting the tension adjusting mechanism 60 is set to the "high" side, in the illustrated example, to the ON side.
Switch. Then, power is supplied to the solenoid 13 from the power supply 55, and the solenoid 13 is driven, so that the operating rod 13a is retracted toward the solenoid 13. Therefore, the tension of the turning power adjusting spring 11 of the control lever 5 is larger than that at the time of the low rotation.

When the accelerator pedal 39 is fully depressed by depressing the accelerator pedal 39, the movement of the accelerator pedal 39 is transmitted to the first lever 33 via the accelerator wire 37 as described above, and the first lever 33 is pivoted. The first lever 33 is rotated to the maximum in the counterclockwise direction around the rotation center 35, and the movement of the first lever 33 is controlled via the governor spring 41 to the second
Of the carburetor 27 via the connecting rod 17, the bell crank 21, the connecting rod 25, and the link 26. It is fully opened.

Then, the governor shaft 3 and the control lever 5 try to rotate clockwise in the drawing due to centrifugal force on the flyball accompanying the increase in the rotation speed of the governor pulley 51. The rotation of the control lever 5 in the clockwise direction acts so as to be canceled by the rotation power adjustment spring 11 because the rotation is larger than that at the time of the low rotation adjustment.

Accordingly, since the rotation angle of the control lever 5 is suppressed to a small value, the angle at which the second lever 15 is pushed back from the receiving seat 5b via the adjustment bolt 31 is also reduced, and the second lever 15 is accordingly reduced. The rotation angle in the counterclockwise direction becomes large and the throttle valve 2
9 increases, and the engine speed when the accelerator pedal is fully opened increases.

The tension of the turning power adjusting spring 11 itself can be adjusted by changing the tightening position of the spring force adjusting bolt 7 in the elongated hole 5a opened in the control lever 5.

[0041] Thus the rotational speed of the engine at the time of full opening of the accelerator pedal 39, will be able to adjust the high and low stages by the switching operation of the manual switch 57,
Moreover such influence of whatever the depression stroke of the accelerator pedal during switching operation is rather name accelerator wire 3
7 has the feature that no loosening occurs .

When such a mechanical governor is applied to a forklift as an industrial vehicle, the speed of the engine is set to a low rotation control range to increase safety during traveling of the forklift, and the vehicle speed is reduced. On the contrary, it is possible to increase the operation efficiency by setting the engine speed in the high speed control range during the loading and unloading work.

[0043]

As described above in detail, according to the mechanical governor of the present invention, the rotation power adjusting spring of the control lever is switched by switching the tension switching mechanism provided on the governor body. , The opening of the throttle valve, which is opened and closed via the second lever, at the time of full opening can be easily adjusted in two levels.

At the time of such an adjustment, there is no change in the depression stroke of the accelerator pedal when the engine is adjusted to a low speed and when the engine is adjusted to a high speed. The above-mentioned burden is not applied, and the operability of the accelerator pedal is maintained satisfactorily. Further, an effect is obtained that the accelerator wire is not loosened due to the change in the depression stroke.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a basic example of a mechanical governor of a two-speed control type according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... governor main body, 3 ... governor shaft, 5 ... control lever, 7 ... spring force adjustment halt, 11 ... rotating power adjustment spring (of control lever), 13 ... solenoid, 15 ... 2nd lever, 17, 25 ... connecting rod , 21 ... Bell crank, 23 ... Adjust nut, 2
6 ... Link, 27 ... Carburetor, 29 ... Throttle valve, 31,53 ... Adjust bolt 33 ... First lever, 37 ... Accelerator wire, 39 ... Accelerator pedal, 41 ... Governor spring, 43 ... Return spring, 47 ... Link, 51 ... Governor pulley, 5
5 ... power supply, 57 ... manual switch, 60 ... tension adjustment mechanism.

Claims (1)

(57) [Claims] A first lever rotatably disposed on the governor main body and interlocking with an accelerator pedal; and the governor main body.
Rotatably mounted on the throttle valve opening / closing mechanism
A second lever connected to the first and second levers ;
Engage with one lever and provided on the other lever
Link the link that engages with the long hole with the first and second levers
A governor spring which forms an, provided to the governor main body, rotated by an appropriate angle by a centrifugal force based on rotation of the engine that will be input via the governor pulley, maximum of the second lever
A control lever that determines the opening of the throttle valve when the accelerator pedal is fully opened by limiting the rotation angle of the second lever by restricting the rotation position
If, provided between the control lever and the governor body
And the tension of the turning power adjusting spring of the control lever and the turning power adjusting spring is adjusted in two stages of high and low.
Rotation speed two-level control type mechanical governor, characterized in that a and tension switching mechanism comprising a solenoid.