JPH078169B2 - Automatic speed reducer for traveling aircraft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention automatically reduces the speed of a belt type continuously variable transmission in association with the rise of a work device accompanying the turning of a traveling vehicle body, and increases the running torque to improve the turning performance. The present invention relates to an automatic speed reducer for a traveling machine body configured to prevent an engine stop due to an increase in traveling resistance at the time.

[Conventional technology]

The conventional automatic deceleration device for a traveling machine body includes a work device that can be lifted and lowered, a belt-type continuously variable transmission device for traveling that changes gears with a tension pulley, and a gear shifting operation that is connected to the tension pulley through a mechanical linkage mechanism. Along with the manual operation tool, a locking tool for holding the shift operation position is provided on the manual operation tool, and a balance spring for reducing the operation force to the deceleration law is stretched between the manual operation tool and the fixed portion. In the middle of the mechanical linkage mechanism, an interlocking member for automatic deceleration that decelerates the continuously variable transmission from a high speed state to a low speed state is provided in association with the rise of the work device, and the operation force to the human operation tool by the automatic deceleration is provided. A flexible portion for releasing the transmission is formed between the interlocking member and the manual operation tool (see, for example, JP-A-62-126904).

The locking tool and the interchange section hold the manual operation tool for speed change operation at a predetermined shift position even during automatic deceleration in order to return the traveling speed to the speed before turning when the turning operation is completed and the working device descends. It is a thing. The balance spring is for counteracting the return force of the tension pulley to the slack side in order to maintain the balance between the operation force on the speed increasing side and the operation force on the speed reducing side.

[Problems to be Solved by the Invention]

In the related art, when the operator changes his / her posture during turning, the body is erroneously touched by an artificial operation tool, and the locking tool for holding the gear shift operation position of the operation tool is released. Due to the force of the balance spring that urges the manual operation tool toward the deceleration side, the manual operation tool may bounce back to the deceleration side vigorously and strike the body of the operator during automatic deceleration.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-described problems of the prior art, and an object thereof is to provide an automatic speed reducer for a traveling machine body that prevents the artificial operation tool from bouncing back during automatic speed reduction and improves safety. It is what

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides the automatic deceleration device for the traveling machine body with a lock mechanism for interfering with the movement of the manual operation tool in association with the rise of the working device.

[Action]

A lock mechanism that stops the movement of the manual operation tool at the same time as the automatic deceleration works based on the lifting of the work device when the traveling machine body is turned.

〔The invention's effect〕

Therefore, according to the present invention, the traveling speed during turning can be decelerated and the traveling speed after the completion of turning can be automatically increased, and the deceleration side can be automatically decelerated while performing the manual shift operation with the balance spring. It is possible to reliably prevent accidental rebound of the inside human operation tool, and to obtain an automatic speed reducer of a traveling aircraft with higher safety.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings of a riding-type rice transplanter equipped with an automatic speed reducer for a traveling body.

As shown in FIG. 4, the traveling body (B) of this riding-type rice transplanter transmits the driving force of the engine (1) mounted to the traveling mission (2) via the belt type continuously variable transmission (A). The front wheels (3) and (4) before and after the output from the mission (2) are being driven. A planting device (D), which is a working device, is connected to the rear part of the traveling machine body (B) via a link mechanism (6) which is operated to move up and down by a hydraulic cylinder (5). A steering section (C) at the center of the traveling body (B) is provided with a handle (7) and an auxiliary gear shift lever (8) for gear shifting, and a continuously variable transmission (A) beside a seat (9).
The main speed change lever (10) is provided as a manual operation tool for speed change operation.

The configuration of the belt type continuously variable transmission (A) will be described.
Split pulley (1) provided on the output shaft (1a) of the engine (1)
A belt (13) is wound around 1) and a pulley (12) provided on the input shaft (2a) of the traveling mission (2) and having a fixed belt winding radius. The split pulley (11) is biased by a spring (15) in the direction of increasing the belt winding radius, and a tension pulley (14) is provided at the swinging end of the arm (16) supported by the input shaft (2a). The tension pulley (14) is pressed by the belt (13) to shift gears to the deceleration side.

As shown in FIG. 1, the bracket (18) on the base end side of the main transmission lever (10) is attached to the body frame (17) along the horizontal axis (P1).
The main transmission lever (10) is mounted so that it can swing freely around it and can be operated back and forth. An interlocking member (20) which will be described later is attached to the body frame (17) of the bracket (18) so as to be swingable about a horizontal axis (P2), and the main speed change lever (20) is attached via the interlocking member (20). 10) and the tension arm (16) of the continuously variable transmission (A) to the operation rod (21),
Connected at (22). With this configuration, when the main shift lever (10) is operated in the (H) direction shown in FIG. 1, the traveling speed is increased, and when it is operated in the (L) direction, the traveling speed is decelerated. A balance spring (23) is provided between the bracket (18) and the machine frame (17) to reduce resistance to gear shift operation toward the deceleration side due to the urging force of the spring (15) provided on the split pulley (11). Is stretched. The interlocking member (20) is a cam portion (20a) for swinging the interlocking member (20) by being pressed into contact with an operation piece (6a) provided at the rear end of the link mechanism (6).
When the planting device (D) is raised as the machine turns, the interlocking member (20) rotates to the right in the drawing to automatically reduce the speed of the continuously variable transmission (A). I am configuring. A long hole (20b) as an interchangeable part for releasing the transmission of the operating force to prevent the transmission of the operating force to the main gear shift lever (10) side when the interlocking member (20) is rotated by automatic deceleration
Is formed on the interlocking member (20), and the main transmission lever (10)
One end of the operation rod (21) that connects the interlocking member (20) with the operation rod (21) is engaged with the elongated hole (20b).

As shown in FIGS. 2 and 3, the lever guide (19) of the main shift lever (10) is formed with a plurality of locking grooves (19a) along the shifting operation direction. A pin (10a) urged to the locking groove (19a) side by a compression spring (10b) force is provided on the main shift lever (10) shaft, and a push button for unlocking is provided on the upper end of the lever (10). (10c) is provided so that the shift operation position of the main shift lever (10) can be held and released. When the turning of the machine is completed and the planting device (D) is lowered, the acceleration is automatically controlled by the urging force of the spring (15) provided on the split pulley (11). Since the main shift lever (10) is held in the operating position, this speed-up control is performed by the interlocking member (20).
The upper end of the elongated hole (20b) formed in the upper part of the operation rod (21) is rotated to the lower end of the operation rod (21) and stopped, so that the traveling speed before the turning can be obtained after the completion of the turning of the machine body.

Next, the structure of the lock mechanism that prevents the main transmission lever (10) from accidentally bouncing will be described. During automatic deceleration, the operating rod (21) is in the middle of the long hole (20b), so the biasing force of the balance spring (23) is received only by the locking action of the pin (10b), which causes the machine vibration. If the lock is released by accidentally pressing the push button (10c), etc., the main transmission lever (10)
Will bounce back to the deceleration side. In order to prevent this, a lock piece (24) that prevents the pin (10a) from descending during automatic deceleration is pivotally supported on the main speed change lever (10) axis about the horizontal axis (P3). At the same time, connect the end of the outer wire (25a) of the release wire to the main transmission lever (1
0) and the long hole (20b) of the interlocking member (20), and attach the end of the inner wire (25b) to the lock piece (2).
It is connected between 4) and the lower end of the operating rod (21). With this configuration, when the interlocking member (20) rotates due to automatic deceleration accompanying the rise of the planting device (D), the distance between the lower end of the outer wire (25a) and the operation rod (21) increases, and the inner wire (25b). ) Through the locking piece (24) through the pin (1
The pin (10a) is clamped and fixed between the locking groove (19a) and the lock piece (24) by rotating the pin (10a) downward.

In the above embodiment, the lock mechanism is configured to fix the pin (10a) for holding the gear shift operation position. However, as another embodiment, the pin (10a) moves in and out of the gear shift operation path of the main gear shift lever (10). The lever may be prevented from moving from the high speed position to the low speed position.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a side view showing a gear shift operation structure, FIG. 2 is a side view showing an operating state of a lock mechanism, FIG. 3 is a partially cutaway rear view showing a gear shift lever locking structure, and FIG. It is the whole rice transplanter side view. (10) …… Human-operated tool, (10a) …… Locking tool, (14)…
… Tension pulley, (17) …… Fixed part, (20) ……
Interlocking member, (20b) ... interchange part, (23) ... balance spring, (A) ... continuously variable transmission, (D) ... working device.

Claims (1)

[Claims] 1. A work position (D) which can be raised and lowered, a belt type continuously variable transmission (A) for traveling which is operated to change gears by a tension pulley (14), and a mechanical linkage mechanism to the tension pulley (14). A balance for reducing the operation force to the deceleration side by providing a manual operation tool (10) for connecting gear shift operation and providing a locking tool (10a) for holding the speed change operation position on the manual operation tool (10). Replace the spring (23) with the manipulator (1
0) and the fixed part (17), and in the middle of the mechanical linkage mechanism, the continuously variable transmission (A) is decelerated from the high speed state to the low speed state in conjunction with the rise of the working position (D). The interlocking member (20) for automatic deceleration is provided, and the interchangeable portion (20b) that releases the transmission of the operating force to the human-made operation tool (10) by the automatic deceleration is provided between the interlocking member (20) and the human-made operation tool (10). In the automatic decelerating device for a traveling machine body formed between the two, a lock mechanism for preventing movement of the manual operation tool (10) in association with the rise of the working device (D) is provided. Automatic reduction gear.