JPS58126442A - Engine speed adjusting device - Google Patents

Abstract

PURPOSE:To easily select an engine speed from a cruising state to a working condition, by providing a selecting means which selects an opening and closing condition of a trottle valve to any one of a speed condition in use through a speed adjusting means and a separately preset speed condition. CONSTITUTION:At work of a tractor or the like in which a throttle lever 2 is placed at a certain position of speed increase, if a selector lever 15 is operated to turn a swivel lever 16 to a direction C', a tension spring 17 is moved beyond a turnably supporting point 0 and deflected to a low speed side to turn a turning arm 5 to the turning limit of the low speed side simulatneously turn a throttle lever 4 to a prescribed position of the low speed side against a coil spring 11 through an engaging member 13, thus the tractor is driven in a cruising condition. Then in case of resetting to a working condition, if the lever 16 is turned in a direction C by the lever 15, the reverse action turns the arm 5 to the upper limit of turning to simultaneously adapt the lever 4 to a stopper 12 of a turning lever 3 interlocking to the lever 2, then the tractor is reset to a position of speed increase.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine rotation speed increasing/decreasing device used in tractors, rice transplanters, etc.

Tractors, rice transplanters, and the like are equipped with a throttle lever that is connected to a throttle valve of an engine via a connecting member, and the opening and closing states of the throttle valve can be adjusted with this throttle lever. This allows you to increase or decrease the engine speed,
When rotating the tractor during work, first change the engine speed to a low speed suitable for the rotation (increased speed in the case of a rice transplanter), and then change the engine speed again to a speed suitable for the work after the rotation is complete. Adjusting the engine speed was extremely troublesome because the engine speed had to be returned to the same speed as before.

This invention makes it possible to instantly switch the engine speed to a predetermined preferred speed when necessary, such as when traveling together, and when returning the engine speed to the original speed. We provide a rotation speed increase/decrease device that allows
An adjusting means that can freely adjust the opening/closing state of the throttle valve of the engine via a connecting member connected to the throttle valve, and a rotating state that is set in advance separately from the operating rotation state set by the adjusting means. The present invention is characterized in that a switching means is provided which can appropriately switch the opening/closing state of the throttle valve to any of the set rotational states. The illustrated embodiment will be described below.

FIG. 1, FIG. 2, and FIG. 3 are a perspective view, a plan view, and a side view, respectively, of an example of a tractor engine rotation speed increasing/decreasing device according to the present invention.

In these figures, a throttle lever 2 is attached to a base plate 1 (not shown in FIG. 2) so as to be rotatable in the direction of arrow A. At the bottom of the throttle lever 2, a rotating lever 3, a throttle rod 4, and a rotating arm 5 are attached in order from 2 to 2. The rotating lever 3 is fixed to the throttle lever 2 and rotates together with the throttle lever 2. The throttle lever 4 and the rotating arm 5 are rotatably supported by fitting respective sleeves 4a and 5a onto the mounting shaft 2a of the throttle lever 2. The sleeves 4a and 5a are stacked on top of each other and are held between the rotary lever 3 and the washer 6 attached to the mounting shaft 2a of the throttle lever 2. A connecting member (in the illustrated example, a cord housed in a tube 7) 8 connected to a throttle valve (not shown) of the engine is connected to the rotating end of the throttle rod 4, and an ear-shaped hole is connected to the rotating end of the throttle rod 4. An attached projecting piece 9 is provided, to which the opposite end of a coil spring 11, one end of which is fixed to a pin 10 provided on the base 1, is locked. The coil spring 11 is held in a stretched state between the pin O and the protruding piece 9 with a hole, and always exerts a force in the direction of arrow B on the connecting member 8. The rotating lever 3 has a stopper 12 that projects downward at its rotating end, and the throttle rod 4, which is pulled in the direction of arrow B by the coil spring 11, comes into contact with this stopper 12 and is prevented from moving any further. It is configured as follows. That is, the rotating lever 3 is not rotated by the tension of the coil spring 11. The rotating arm 5 also has an engaging member 13 protruding upward near its rotating end.
and a rod 14 protruding downward, the throttle rod 4 also comes into contact with this engaging member 13, and the arrow B
Movement in this direction is restricted. The throttle lever 2 on the base plate 1 is rotatably mounted. The lower end of the switching lever 15 is integrally provided with a swinging rod 16 that rotates in the direction of force indicated by arrows c and c', and a hole 16 bored in the tip of the swinging rod 16 is provided.
A tension spring 17 that acts in the tension direction is disposed between a and the rod 14 of the rotating arm 5. The tension spring 17 is attached to the rotating arm 5 and the swinging rod 16 on both sides of the rotating fulcrum (0) of the rotating arm 5.
, rod body 14, rotation fulcrum (0) and hole 1 of swinging rod 16
5. When a is lined up in a straight line, that is, when the tension spring 17 passes directly below the rotation fulcrum (0), it is neutral, but if it swings even slightly in either direction from this state,
The tension of the tension spring 17 causes the rotation arm 5 to rotate all at once to the rotation limit position in that direction.

In the illustrated example, the direction in which the connecting member 8 is pulled by the coil spring 11 (arrow B direction) is the direction in which the engine speed increases, and the opposite direction is the direction in which the engine speed is decreased. , depending on the application, arrow B may be the opposite.
The direction may be the deceleration direction. When the throttle lever 2 is rotated in the direction of arrow B, the rotary lever 3, which is provided integrally with the throttle lever 2, is also rotated in the direction of arrow B, so that the throttle rod 4 that is in contact with the stopper 12 is also rotated by the coil. It is pulled by the spring 11 and rotates in the direction of the force indicated by the arrow Is, moving the connecting member 8 in the same direction, so the engine rotational speed increases.
rise When the throttle lever 2 is rotated in the opposite direction, the stopper 12 causes the throttle rod 4 to move against the coil spring 1.
1 in the opposite direction to the arrow B and moves the connecting member 8 in that direction, the engine speed decreases accordingly.

That is, the throttle lever 2, rotation lever 3, etc. constitute an adjusting means that can freely adjust the engine speed.

At the same time, with the throttle lever 2 held at a certain acceleration position i, operate the switching lever 15 to move the swinging rod 16 to the arrow C.
'When rotated in the force direction, the tension spring 17 moves to the rotation fulcrum (0
), the rotating arm 5 rotates to the low speed rotation limit of 1 at a time. At this time, the engaging member 13 of the rotating arm 5 comes into contact with the throttle rod 4 and rotates the throttle rod against the coil spring 11 to a predetermined position on the low speed side, so that the connecting member 8 moves to the low speed side by that much. Then, the engine speed is reduced to a predetermined value. At this time, the low-speed rotation limit of the rotating arm 5 is a position where the tension spring 17 is balanced or a position where the throttle lever 4 comes into contact with the end of the cord tube 7, which is a connecting member. A lower limit stopper, which the rotary arm comes into contact with, may be provided in the middle of the rotation stroke, thereby setting the low speed rotation limit.

When the engine speed, which has been reduced to a low speed state, is to be returned to an increased speed state, the switching lever 15 is operated to rotate the swinging rod 16 in the direction of arrow C.

At this time, the tension spring 17 is pulled toward the speed increasing side by the swinging rod 16, and the rotating arm 5 rotates together with the throttle lever 4 toward the speed increasing side, but the tension spring 17 is pulled toward the above rotation fulcrum (0).
As soon as the rotation arm 5 reaches its maximum rotation limit (speed-increasing rotation limit), the throttle lever 4 also rotates until it comes into contact with the stopper 12I of the rotation lever 3 (i.e.,
(to the original speed increasing position) - rotates in the speed increasing direction. As the throttle rod 4 rotates, the connecting member 8 also moves to the original speed increasing position, so that the engine speed returns to the original speed increasing state. That is, the rotating arm 5, the tension spring 17, the swinging rod I6, the switching lever 15, etc. constitute means for switching the engine rotational speed. Note that, depending on the application, the return to the original rotational state may be automatically performed by operating the steering wheel, as in the case of a direction indicator in a passenger car. Furthermore, the throttle lever 2 and the switching lever 15 may be knob-shaped.

As explained above, the engine rotation speed increase/decrease device according to the present invention has an adjustment means that can freely adjust the engine rotation speed, as well as an operating rotation state set by the adjustment means and a predetermined set rotation speed. Since it is equipped with a switching means that can change the engine speed as appropriate to either state, it is possible to change to a set rotation state suitable for accompanying parties, etc. and return to the original operating speed with a simple switching operation. It has become extremely convenient to use tractors, etc. It is advantageous to use a device like the one shown in the drawings, which is equipped with a throttle lever, a switching lever, a rotating arm, etc., as the engine speed increasing/decreasing device because it has a simple structure and can provide reliable operation.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, and FIG. 3 are a perspective view, a plan view, and a side view, respectively, of an example of an engine rotation speed increasing/decreasing device according to the present invention. DESCRIPTION OF SYMBOLS 1... Board, 2... Throttle lever, 3... Rotating lever, 4... Throttle rod, 5... Rotating arm, 8
... Connecting member, 9 ... Projection piece with hole, 1 coil spring, 12 ... Stopper, 13 ... Engagement member, '3-5
...Switching lever, 16...Swinging rod, 17 - Tension spring.

Claims (2)

[Claims] (1) A rotational speed adjusting means that can freely adjust the open/closed state of the throttle valve of the engine via a connecting member connected to the throttle valve, and the operating rotational state set by the adjusting means. An engine rotational speed increasing/decreasing device comprising a switching means capable of appropriately switching the open/closed state of a throttle valve to any of preset rotational states separately set in advance. (2) A coil spring for pulling the connecting member in a certain direction is attached to the rotating end of the throttle rod, which has one end pivotally supported and a connecting member connected to the opposite rotating end, and the throttle rod A rotary lever is provided with a stopper that comes into contact with the coil spring and restricts free rotation in the tension direction of the coil spring, and by rotating the rotary lever, the connecting member is moved. an adjusting means configured to open and close; a rotating arm having one end pivotally supported and an engaging member having an opposite rotating end to which the throttle rod is engaged; and the rotating arm. A swinging rod is provided on the opposite side of the swinging fulcrum, and the shaft of the swinging arm and the swinging rod are connected by a tension spring that acts in the tensile direction. When the tension spring is swung toward the set rotation speed through the rotation fulcrum of the rotation arm, the rotation arm, together with the throttle rod, is rotated all at once to the predetermined rotation speed position due to the action of the tension spring. When the tension spring is moved from the set rotation speed position to the opposite side beyond the rotation fulcrum, the rotation arm rotates at once to the rotation limit in that direction due to the action of the tension spring. At this time, the throttle lever, which rotates in the same direction as the rotary arm, comes into contact with the stopper of the rotary lever and stops at the original rotation speed position adjusted by the adjusting means. The engine speed increase/decrease device according to claim 1