JPH0346259Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a tillage rotary drive device in a tiller.

(b) Conventional technology In a tiller, a two-stage transmission mechanism for height and low speed is incorporated in the tilling transmission system located before the output shaft of the cultivation machine, and the driving speed of the tilling rotary can be adjusted by switching and operating this transmission mechanism. In addition, a safety latch is incorporated into the tilling transmission system, and when the tilling rotary is raised above the ground and away from the ground when turning the aircraft, the safety latch is disengaged and the tilling rotary is shifted to the tilling rotary. A tilling rotary drive device configured such that the power transmission is stopped is already known, and a conventional device of this kind had the configuration shown in FIG.

That is, in the conventional system, the tilling transmission system in the transmission is provided with two intermediate shafts 6 and 6' between the input shaft 1 that receives power from the engine E and the output shaft 7 that transmits power to the tilling rotary. , transmission is transmitted from the input shaft 1 to the intermediate shaft 6 through gears 2 and 3, and the intermediate shaft 6
The intermediate shaft 6' has two high and low speed gear trains 5 and 11.
4, 10, and further transmitted from the intermediate shaft 6' to the output shaft 7 through another gear.

The selection of the two high and low speed gear trains 5, 11 and 4, 10 is achieved by operating a lever 12c to move the slide gear 12, which is located between the two gear trains and is slidably fitted onto the intermediate shaft 6'. Transmission is performed by sliding in the axial direction, and transmission from the intermediate shaft 6' to the output shaft 7 is performed by meshing the slide gear 12 with the passive gear 13 fitted to the output shaft, thereby ensuring safe operation. The take latch mechanism includes the passive gear 13 and a clutch slider 14 installed on the output shaft 7 in correspondence with the passive gear 13.
The clutch slider 14 is a lever 14c that is different from the gear shift lever 12c.
It was constructed so that it could be operated.

(c) Problems to be solved by the invention The conventional tillage rotary drive device is configured as described above, and requires many shafts and other component parts that make up the tillage transmission system, and also requires a shift lever. Since a separate lever is required for the safety lever and safety latch, operation and handling are cumbersome and erroneous operation is likely to occur, and the overall structure is complex, resulting in a large and heavy device, resulting in high costs.

This invention focused on the above-mentioned problems with conventional equipment and was implemented with the aim of eliminating the problems.It includes a transmission mechanism that changes the drive speed of the tilling rotary, and a transmission mechanism that changes the drive speed of the tilling rotary when turning the machine. To provide a tillage rotary drive device for a tiller that is simple, lightweight, and easy to operate, although it is equipped with a safety latch that interrupts power transmission.

(d) Means for solving the problem That is, the tilling rotary drive device according to the present invention sets the transmission speed to the tilling rotary in two stages, high and low, in the tilling transmission system located before the output shaft of the mill. A tilling rotary drive device for a tiller that incorporates a high-speed transmission mechanism and a safety latch that stops power transmission to the tilling rotary when the tilling rotary is lifted off the ground and leaves the ground, the high-low speed two of the variable-speed transmission mechanism is incorporated. The driven gears 4' and 5' in the gear train of the train are loosely fitted to the output shaft 7 at a predetermined interval, and clutch claws that can be engaged and disengaged from the clutch claws of both driven gears 4' and 5' are provided on both sides. A clutch slider 8 is slidably wedged on the output shaft 7 between the two driven gears 4', 5', and the clutch slider 8 and the driven gears 4',
5' are interposed between springs 9 and 9 to hold and energize the clutch slider 7 at a neutral position, and the clutch slider 7 is slid in the axial direction by operating a single lever 18. , clutch slider 8
and a variable speed transmission mechanism that selectively engages the clutch claws of both driven gears 4' and 5', and uses the clutch slider 8 in common to set the transmission speed to the tilling rotary. It is characterized by comprising a safety clutch that stops power transmission to the tilling rotary when the tiller is lifted off the ground.

(e) Effects of the invention In the tilling rotary drive device of the invention, the passive gears 4' and 5' in the two high and low speed gear trains of the variable speed transmission mechanism are loosely fitted to the output shaft 7 at a predetermined interval, and A clutch slider 8, which is provided with clutch pawls on both sides that can engage and disengage the clutch pawls of both driven gears 4' and 5', is slidably wedged on the output shaft 7 between both driven gears 4' and 5'. , springs 9 and 9 are interposed between the clutch slider 8 and the driven gears 4' and 5', respectively, to hold and energize the clutch slider 8 in the neutral position.
is slid in the axial direction by operating a single lever 18, and the clutch slider 8 and both driven gears 4',
Since the clutch pawl 5' is selectively engaged, there is a transmission mechanism that changes the drive speed of the tilling rotary, and a safety mechanism that cuts off the transmission to the tilling rotary when the machine turns. Compared to conventional models, the number of required parts is significantly reduced, the structure is simple and lightweight, and costs are significantly reduced.Moreover, the transmission mechanism and safety clutch can be operated in common with a single lever. This simplifies operation, prevents erroneous operations, and is safe.

(f) Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

Figure 2 is a cross-sectional view of a part of the mission in which the present invention is implemented, Figure 3a is an explanatory diagram showing its operating system,
FIG. 3b is a partial cross-sectional view taken along the line AA in FIG. 3a.

In FIG. 2, an intermediate shaft 6 is provided between the input shaft 1 and the output shaft 7, and the power transmission from the input shaft 1 to the intermediate shaft 6 is different from the conventional example shown in FIG. It has a similar structure.

Gears 4 and 5 in two high and low speed gear trains of a variable speed transmission mechanism that transmits power to the tilling rotary are fixedly fitted to the intermediate shaft 6 at a predetermined interval in the axial direction,
Passive gears 4' and 5' loosely fitted to the output shaft 7 are always engaged with the respective gears 4 and 5, and a clutch pawl is formed on the inner surface of each of the passive gears 4' and 5'. .

A clutch slider 8 is provided on both sides of the output shaft 7 between the driven gears 4' and 5' with clutch pawls corresponding to the clutch pawls of the driven gears 4' and 5'.
is wedged so as to be slidable in the axial direction, and the clutch slider 8 is balanced and biased to the neutral position by springs 9, 9 interposed between both sides of the clutch slider 8 and the driven gears 4', 5', respectively. It's starting to be preserved.

Therefore, the clutch slider 8 has a guide groove 8a.
is carved into the guide groove 8a, and a shift hawk 15 is formed in the guide groove 8a.
The shift fork 15 is integrally provided with the shift arm 15'.

Spring 16, 1 is attached to both ends of the shift arm 15'.
One end of each spring 16 is latched, and each spring 16
The other ends are connected to the inner ends of the operating cables 17, 17, and the other ends of each inner are respectively connected to a pair of operating arms 19, 19 provided in a structure extending beyond the dead center.

A single lever 18 that can be rotated in a cross direction is installed between the pair of actuation arms 19, 19, and by turning the lever 18 in the left and right direction, the actuation arm 1
9, 19, and then rotate the operating cables 17, 17 forward.
It is configured so that any one of the inners can be selectively engaged.

(g) Effect When the input shaft 1 rotates, the passive gears 4', 5' rotate via the intermediate shaft 6, etc., but since the passive gears 4', 5' are loosely fitted to the output shaft 7, the output shaft 7 does not rotate.

Next, when the lever 18 is rotated to the left in the figure and then rotated forward, one of the operating arms 19 is moved by the movement of the lever, and the operating cable 17 is moved.
is engaged, the clutch slider 8 is moved to the right, the clutch slider 8 is engaged with the passive gear 5' by the clutch pawl, and the output shaft 7 is rotated at high speed.

When plowing in this power transmission state and reaching the headland of the field, the tilling rotary is raised above the ground and the machine is turned around, but at that time, the lever 18 is returned to neutral before raising the tilling rotary. Manipulate.

Then, the springs 9, 9 act to disengage the clutch pawl between the clutch slider 8 and the gear 5', but while the tilling rotary is in the working position, the engagement surface of the clutch pawl on both is due to the tillage resistance of the soil. Since a large force is acting on the clutch pawl, the clutch pawl does not disengage. Then, when the tilling rotary is lifted up and away from the ground, the tilling resistance applied to the tilling rotary disappears and the tilling rotary becomes unloaded, so the clutch pawl is disengaged and power transmission to the tilling rotary is cut off.

Note that the tillage rotary is driven at low speed by lever 18.
This can be done by rotating the machine to the right in the figure and then rotating it forward, and stopping the tilling rotary when turning the machine is also done in the same way as in the case of high-speed drive.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional structure, Fig. 2 is a sectional view of a part of a transmission in which the present invention is implemented, and Fig. 3 is a sectional view showing a conventional structure.
Figure a is an explanatory diagram showing the operation system, and Figure 3 b is the third
It is an AA sectional view in figure a. 4', 5'... Passive gear, 7... Output shaft, 8...
Clutch slider, 9... spring, 18... lever.

Claims (1)

[Scope of utility model registration request] The tilling transmission system, located in front of the transmission shaft of the mill, includes a variable speed transmission mechanism that sets the transmission speed to the tilling rotary in two stages, high and low, and when the tilling rotary is raised above the ground and leaves the ground, In a tilling rotary drive device for a tiller that incorporates a safety latch for stopping transmission, passive gears 4' and 5' in the two high and low speed gear trains of the variable speed transmission mechanism are connected to the output shaft 7 at a predetermined interval. While loosely fitting both driven gears 4',
A clutch slider 8, which has clutch pawls on both sides that can be engaged with and disengaged from the clutch pawl 5', is slidably wedged on the output shaft 7 between the two driven gears 4' and 5'. Passive gear 4',
5' are interposed between springs 9 and 9 to hold and energize the clutch slider 7 at a neutral position, and the clutch slider 7 is slid in the axial direction by operating a single lever 18. , clutch slider 8
and a variable speed transmission mechanism that selectively engages the clutch claws of both driven gears 4' and 5', and uses the clutch slider 8 in common to set the transmission speed to the tilling rotary. A tilling rotary drive device for a tiller, comprising a safety clutch that stops power transmission to the tilling rotary when the tiller is lifted up and away from the ground.