JPH0686821B2 - Vehicle throttle control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention makes it possible to take out a PTO output for driving external equipment from a running engine, and at the time of taking out this PTO output, the engine is operated at a constant speed by a governor. The present invention relates to a control device applied to such a small vehicle.

(Background of the Invention) Rough-terrain traveling including at least three wheels with wide ultra-low pressure tires, a traveling engine mounted near the center of a vehicle body, and a straddle-type operation seat located above the engine There is a vehicle. There is a vehicle of this type that takes out the engine output for driving as PTO (Power Take Off) output and can drive external equipment such as a lawn mower, a sprayer, a cultivator, and a pump. In this case, it is desirable to keep the rotation speed of the PTO output shaft almost constant in the PTO mode that takes out the PTO output. This is because when controlling the engine speed with the manual throttle lever used when traveling in PTO mode, the engine speed becomes unstable and the PTO output shaft exceeds the rated speed of the external device connected to this PTO output shaft. It is possible that the speed becomes.

Therefore, it is necessary to control the throttle valve opening of the carburetor with the governor in the PTO mode, and to control the throttle valve opening with the ordinary manual or foot-operated operator in the traveling mode.

In this way, the throttle valve can be selectively controlled by a manual or foot-operated manipulator and a governor.When the manipulator is controlled, the governor is not interlocked in order to reduce the operating force. Is desirable.

(Object of the Invention) The present invention has been made in view of the above circumstances, and is small in size that can reduce the operating force of the operator because the governor does not interlock when it is controlled manually or by the operator operating the foot. An object of the present invention is to provide a throttle valve control device for a vehicle.

(Constitution of the invention) According to the present invention, the object is a vehicle in which the throttle valve opening of the carburetor can be selectively controlled by a manual or foot-operated operator and a governor for keeping the engine at a set speed, A first lever that engages with the throttle valve interlocking body in the throttle valve closing direction and is rotated in the throttle valve opening direction by the operator, and a first spring that biases the first lever in the throttle valve closing direction. And a second lever that engages the throttle valve interlocking body in the throttle valve closing direction, and a second spring that biases the throttle valve interlocking body in the throttle valve opening direction, and the urging force of the first spring. Is set to be stronger than the urging force of the second spring, the second lever is connected to the governor, and the operator is held at an appropriate opening position in the governor use state, while the governor sets the speed. As described above, the second lever is rotated in the throttle valve closing direction. This is achieved by the throttle valve controller.

(Embodiment) FIG. 1 is a perspective view showing a power plant according to an embodiment of the present invention.
2 and 3 are a side view and a plan view of a vehicle to which this embodiment is applied.
Fig. 4 is a sectional view near the governor, Figs. 5 and 6 are right and left side views of the carburetor, and Fig. 7 is VII-VII in Fig. 5.
It is a line sectional view.

In FIG. 2, the rough terrain vehicle 10 has two steering front wheels 12 and two steering front wheels 12.
It is provided with individual driving rear wheels 14. These front wheels 12 and rear wheels 14
A wide ultra-low pressure tire (so-called balloon tire) is adhered to. A running engine 16 near the center of the vehicle body
Is installed. A steering bar handle is located above the front wheel 12.
A fuel tank 20 and a straddle-type operation seat 22 are sequentially arranged behind the bar handle 18.
The driver sits astride the driving seat 22.

As shown in FIG. 4, the engine 16 rotates the crankshaft 24 by rotating the automatic centrifugal clutch 26, the multi-plate clutch 28, the multi-stage transmission.
It is configured to transmit to the output shaft 34 via 30 and the bevel gear 32. The rotation of the output shaft 34 is transmitted to the final reduction gear device 40 provided on the rear wheel shaft 38 by the drive shaft 36 (Fig. 1). The multi-plate clutch 28 is interlocked with the transmission operation of the transmission 30 and temporarily disengaged at the moment of the shift.

Further, the engine 16 has a PTO output extraction mechanism 42 installed therein. This mechanism 42 includes the centrifugal clutch 26 and the clutch.
Gears 44 and 46 driven by the crankshaft 24 via the gear 28a of 28, a shaft 48 that rotatably supports the gear 46, and a dog clutch together with the gear 46 spline-coupled to the shaft 48.
A slider 52 forming 50, a mechanical centrifugal governor 54 provided on the shaft 48, and a bevel gear 56 for transmitting the rotation of the shaft 48 to the shaft 55 are provided. Rotation of shaft 55 is via drive shaft 58 through PTO output shaft 60
Be transmitted to. The PTO output shaft 60 is supported by the case of the final reduction gear unit 40 as shown in FIG.

A manual switching lever 62 is provided on the right side surface of the engine 16. A switching shaft 64 is provided at the rear of the engine 16, and a lever 66 fixed to the upper end of the switching shaft 64 and the lever 62 are connected by a link 68. Another lever 70 (FIG. 4) is fixed to the switching shaft 64, and the rotating end of this lever 70 is engaged with a fork 72 for moving the slider 52.

Therefore, if the switching lever 62 is tilted forward (direction of travel), the PTO
The mode is set, the switching shaft 64 rotates counterclockwise in FIG. 4, the fork 72 and the slider 52 move to the left, and the dog clutch 50 meshes. Therefore, when the crankshaft 24 reaches a predetermined rotation speed or higher, the rotation of the crankshaft 24 is restricted by the centrifugal clutch 26, the gears 28a, 44, 46, the slider 52, the shaft 48, and the bevel gear 5.
6, transmitted to the PTO output shaft 60 via the shaft 55 and the drive shaft 58. On the contrary, if the switching lever 62 is tilted backwards, the running mode is set, the dog clutch 50 is disengaged and the PTO output shaft 60 is stopped.

As shown in FIG. 4, the governor 54 includes a disc 74 separate from the slider 52, a weight 76 supported by the disc 74, and a slider slidably held on a shaft 48 in the axial direction. With 78.
The disc 74 is restricted from moving to the left by a retaining ring 79 fixed to the shaft 48. A lever is attached to the right end surface of the slider 78.
80 contacts, and lever 82 rotates together with lever 80.
The lever 80 is biased by a spring (not shown) so as to push the slider 78 to the left.

84 is a carburetor, and this carburetor 84 is selectively interlocked with a throttle lever 86 as a manual operator provided on the bar handle 18 and a lever 82 of the governor 54 according to the operation of the switching lever 62. Next, the mechanism will be described with reference to FIGS.

This carburetor 84 is provided with a piston type throttle valve 88a and a butterfly type throttle valve 88b on the downstream side thereof, and both throttle valves 88a and 88b are interlocked. That is, when the valve shaft 90 of the throttle valve 88b is opened, the throttle valve 88a is opened, and when the throttle valve 88a is stuck in the carburetor body and cannot return (stuck), the throttle valve 88b.
Only close. Since the throttle valve 88b is merely provided as a measure against stacking of the throttle valve 88a in this manner,
This will be described as one throttle valve 88.

The boss of the carburetor body supporting the left end of the valve shaft 90 has a first
The lever 92 of the first lever 92 is rotatably mounted.
The throttle lever 86 and the throttle lever 86 are connected by a wire 94. A lever 96 is fixed to the left end of the valve shaft 90, and the lever 96 engages with the first lever 92 in the direction of opening the throttle valve 88 (throttle valve opening direction). A torsion spring 98 imparts a habit of returning to the throttle valve closing direction to the first lever 92.

The boss of the carburetor body supporting the right end of the valve shaft 90 has a second
The lever 100 is rotatably mounted, and this second lever 1
00 and the lever 82 of the governor 54 are connected by a wire 102. This second lever 100 is biased clockwise in FIG. 5 by a weak return spring 101 in order to prevent the slack of the wire 102. A lever 104 is fixed to the right end of the valve shaft 90, and the lever 104 engages with the second lever 102 in the throttle valve closing direction. Reference numeral 106 denotes a second spring, which gives the lever 104 at the right end of the valve shaft 90 and the valve shaft 90 a habit of returning to the throttle valve opening direction. The urging force of the first spring 98 is set to be larger than that of the second spring 106.

Next, the operation of this embodiment will be described. In the driving mode in which the switching lever 62 is tilted backward, the dog clutch 50 is disengaged and the PTO
Output shaft 60 is stopped. At this time, since the shaft 48 of the governor 54 is stopped, the slider 78 of the governor 54 is located on the left side in FIG. 4 and the wire 102 is loosened. On the other hand, when the throttle lever 86 is not operated, the first lever 92 is biased clockwise in the sixth direction and is engaged with the lever 96. Therefore, the valve shaft 90 is biased by the first spring 98 in the throttle valve closing direction, and the second spring 106
As a result, an urging force in the opening direction of the throttle valve acts. But first
Since the spring 98 is set stronger than the second spring 106, the urging force of the first spring 98 prevails, the valve shaft 90 rotates in the throttle valve closing direction, and the throttle valve 88 moves to the fully closed position. Stabilize.

If the throttle lever 86 is operated in this state, the throttle valve 88 opens and closes according to the movement. Governor 54 side wire 10
Since 2 is pulled by the return spring 101, the second lever 100 is pivoted to the throttle valve open position and remains there.

Next, in the PTO mode in which the switching lever 62 is tilted forward, the dog clutch 50 is engaged, the shaft 48 rotates, and the PTO output shaft 60 and the governor 54 rotate. If you hold the throttle lever 86 in the fully open position when switching to this PTO mode,
The urging force of the first spring 98 is not transmitted to the valve shaft 90, and the second
The valve shaft 90 is rotated in the throttle valve opening direction by the urging force of the spring 106. At the moment of switching to the PTO mode, the slider 78 is in the throttle valve fully open position on the left side in FIG.
The spring 106 rotates in the fully opening direction so that the lever 104 engages with the second lever 100. As the engine speed increases, the slider 78 of the governor 54 moves to the right in FIG.
2 is pulled, and the second lever 100 rotates in the throttle valve closing direction (counterclockwise direction in FIG. 5). Then, the valve shaft 90 is stabilized at a position where the second spring 106 and the centrifugal force of the weight 76 of the governor 54 are in equilibrium, that is, at a position where the speed is set.

The throttle lever 86 may be held at the fully open position by a lock mechanism, but may be manually held by the driver at the fully open position. In the latter case, if the driver releases the throttle lever 86, the first spring 98
However, since the throttle valve 88 returns to the fully closed position by overcoming the second spring 106, constant speed operation by the governor 54 is possible only when the driver is on board, and safety is improved.

In the above embodiment, the throttle valve control device is provided in the carburetor 84, and the valve shaft 90 that rotates integrally with the throttle valve 88 is the throttle valve interlocking body in the present invention.

FIG. 8 is a conceptual view of another embodiment of the present invention, and FIG. 9 is an exploded perspective view of a distributor. In FIG. 9, the same parts as those of the embodiment shown in FIGS. 1 to 7 are shown by adding A to the same reference numerals.
In these figures, 200 is a distributor, and the throttle valve 88 of the vaporizer 84A is
An intermediate lever 204 as a throttle valve interlocking body pulled by A wire 202 to A, a weak second spring 106A for urging the intermediate lever 202 in the throttle valve opening direction, and an intermediate lever 204 in the throttle valve closing direction. This first lever 92A and this first lever 9
A strong first spring 98A that biases 2A in the throttle valve closing direction and a second lever 100 that engages the intermediate lever 204 in the throttle valve closing direction.
A and return spring 101 to prevent slack in wire 102A
Equipped with A and. While the first lever 92A is pulled in the throttle valve opening direction by the throttle lever 86A via the wire 94A,
The second lever 100A is pulled in the throttle valve closing direction by the lever 82A of the governor 54A via the wire 102A. Since the operation of this embodiment is the same as that of FIGS. 1 to 7, the description thereof will not be repeated.

In each of the above embodiments, when the governors 54, 54A and the second levers 100, 100A are connected by links instead of the wires 102, 102A, the return springs 101, 101A are unnecessary.

(Effects of the Invention) As described above, the present invention urges the throttle valve interlocking body in the throttle valve opening direction by the weak second spring, while the strong first spring interlocks the throttle valve interlocking via the first lever. The body is urged in the closing direction, and in the running mode the first lever is opened in the throttle valve opening direction by manual or foot operation, while in the PTO mode, the first lever is held near the fully open position while the governor is held. The second lever is rotated in the closing direction of the throttle valve. As a result, in the traveling mode, the second lever is left in the fully open position and stopped, and the operator is completely independent of the governor, so that the operation of the operator is lightened.

[Brief description of drawings]

FIG. 1 is a perspective view showing a power plant according to one embodiment of the present invention,
2 and 3 are a side view and a plan view of a vehicle to which this embodiment is applied.
Fig. 4 is a sectional view near the governor, Figs. 5 and 6 are right and left side views of the carburetor, and Fig. 7 is VII-VII in Fig. 5.
It is a line sectional view. FIG. 8 is a conceptual view of another embodiment of the present invention, and FIG. 9 is an exploded perspective view of a distributor. 16,16A …… Engine, 54,54A …… Governor, 86,86A …… Throttle lever as operator, 88,88A …… Throttle valve, 90 …… Valve shaft as throttle valve interlocking body, 92,92A… ... first lever, 98,98A ... first spring, 100,100A ... second lever, 106,106A ... second spring, 204 ... lever as throttle valve interlocking body.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location F02D 29/00 B 9248-3G

Claims (1)

[Claims] 1. A vehicle in which the throttle valve opening of a carburetor can be selectively controlled by a manual or foot-operated operator and a governor that keeps an engine at a set speed. A first lever that is engaged with and is rotated in the throttle valve opening direction by the operator, a first spring that biases the first lever in the throttle valve closing direction, and a throttle valve in the throttle valve closing direction. A second lever that engages with the interlocking body and a second spring that biases the throttle valve interlocking body in the throttle valve opening direction are provided, and the biasing force of the first spring is the biasing force of the second spring. While setting it stronger, the second lever is connected to the governor to hold the operator at an appropriate opening position when the governor is in use, while the governor throttles the second lever at a set speed or more. A throttle valve control device for a vehicle, which is rotated in a valve closing direction.