JPH0621A - Movable harvester gearbox - Google Patents

Abstract

(57) [Summary] [Configuration] The auxiliary transmission 14 includes a first gear mechanism C, a second gear mechanism D having a reduction ratio of 20 to 30% higher than that, and a winding spring 25 for urging the gear mechanism C to be selected. In preparation for this, an operation pedal 31 for selecting either a high speed by the first gear mechanism C or a low speed by the second gear mechanism D is provided in the control section, and the low speed position L
The locking operation can be maintained at the high speed position F by the stepping operation against the biasing force of the winding spring 25, and the high speed position F can be obtained by the stepping operation of the operation pedal 31 at the high speed position F toward the low speed position L. The locking mechanism E is configured to release the operation tool locking maintenance function in (1). [Effect] A slight deceleration operation can be quickly performed by one-touch operation by only depressing the operation pedal, and it is possible to cope with an increase in the load such as the ground becoming muddy during the mowing operation without excessively slowing down the engine rotation, thus improving work efficiency. To improve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling transmission device for a harvesting machine such as a straw harvester and a combine harvester, and more particularly to a technique for rapidly performing a low speed operation with a slightly reduced reduction ratio.

[0002]

2. Description of the Related Art In a mowing harvester, a load on the engine becomes large at a set constant mowing traveling speed due to factors such as partial swamps during the mowing operation and a large density of grain culm colonies. Therefore, deceleration operation may be performed. In such a case, conventionally, the traveling transmission such as the main transmission has been dropped to the first stage deceleration side.

[0003]

Since the load increase phenomenon during the above-mentioned mowing work suddenly occurs, the operator is actually required to perform a quick deceleration operation in order to avoid engine stall. However, the deceleration operation using the conventional transmission for transmission, that is, the general deceleration operation, takes a relatively long time, and the work efficiency due to the time lag until the engine speed is reduced too much is recovered. In addition to the tendency to cause a decrease, the deceleration rate against the cause of the above-mentioned load increase is usually too large in the normal deceleration operation, and the work traveling speed during deceleration tends to be too low. An object of the present invention is to prevent the work efficiency from being excessively lowered by preventing the travel speed from being reduced as much as possible and allowing the operation to be performed quickly at a low speed even if the load is slightly increased during the cutting operation. There is a point to do.

[0004]

In order to achieve the above object, the present invention comprises a first speed change mechanism and a second speed change mechanism having a speed change ratio slightly deviating from the speed change ratio of the first speed change mechanism for traveling. In preparation for the mission, an urging mechanism is provided for urging the traveling mission to a state in which the low speed transmission state by the second speed change mechanism appears, and the traveling mission is set to the high speed transmission state and the low speed transmission state by the first speed change mechanism. The operating tool for selectively selecting and setting one of the power transmission state and the transmission state is provided, and the operating tool is moved from the low speed position where the low speed transmission state appears, against the biasing force of the biasing mechanism. It is possible to lock and maintain the high-speed position where the high-speed transmission state appears by the operation, and the operation lock maintaining function at the high-speed position can be achieved by moving the operation tool at this high-speed position toward the low-speed position. Configured to be released Characterized in that are provided with a locking mechanism.

[0005]

In other words, when it is desired to reduce the traveling speed a little due to becoming a wetland during work traveling, it can be dealt with by changing from the high speed transmission state by the first speed change mechanism to the low speed transmission state by the second speed change mechanism. Therefore, it is possible to prevent the vehicle from decelerating extremely while coping with an increase in load. The traveling mission, which can be locked and maintained in the high-speed transmission state, is biased to the low-speed transmission state, and the operation tool lock maintaining function at the high speed position is released by the operation operation of moving the operation tool to the low speed side. Therefore, for example, if the pedal in the high-speed position is depressed a little, then the pedal is moved to the low-speed position by itself by the urging force to the low-speed side to move to the low-speed transmission state. Moreover, it becomes possible to shift from the high speed transmission state to the low speed transmission state. In addition, this low-speed biasing structure also provides a function that makes it possible to maintain the high-speed transmission state while preventing sudden operation from low speed to high speed.

[0006]

Therefore, since the set work traveling speed can be quickly changed to a traveling speed slightly decelerated, the engine speed can be slightly increased to increase the traveling load during the reaping work regardless of the skill and immatureness of the operation. It was possible to quickly respond to the mission for traveling without dropping too much, and it was possible to improve work efficiency. Further, there is also an advantage that the possibility of becoming a high speed transmission state is reduced unintentionally.

[0007]

Embodiments of the present invention will be described below with reference to the drawings when applied to a strawberries harvester, which is an example of a harvester. FIG. 1 and FIG. 2 show a strawberry harvester in which a mowing part A is arranged in front of a traveling body B.
Is composed of a weeding device 1, a raising device 2, a mowing device 3, a sandwiching and conveying device 4, a bundling device 5, a side feed locking and conveying device 6, a selecting device 7, etc., and the traveling machine body B is a control part 8, It is composed of a crawler traveling device 9, a loading platform 10 for loading the bundled stem and culm, and the like. Reference numeral 11 is an engine, and 13 is a traveling mission.

Next, the transmission structure for traveling will be described. As shown in FIG. 5, the power of the engine 11 is transmitted to the left and right crawler traveling devices 9, 9 via a traveling mission 13 including a sub transmission 14 and a main transmission 12. The belt transmission mechanism 15 works together with the auxiliary transmission 11 and the auxiliary transmission 14. Further, the input shaft 16 of the main transmission 12 is extended, and the mowing unit A is provided beyond the input shaft 16.
A transmission pulley 17 is attached to the. As shown in FIG. 3, the sub-transmission device 14 is configured as a gear system including a first speed change mechanism C and a second speed change mechanism D having a speed change ratio slightly closer to the deceleration side than the speed change ratio of the first speed change mechanism C. There is. In detail,
The sub-transmission input shaft 18 and the main transmission input shaft 16 are mounted in the sub-transmission case 14k so as to be relatively rotatably fitted and arranged, and are spline-fitted to the sub-transmission input shaft 18 so as to be laterally slidable. A first shift gear 19, a passive gear 21 externally spline fitted to the intermediate shaft 20, a second shift gear 22 laterally slidably fitted to the intermediate shaft 20, and a first speed gear 23 spline externally fitted to the main transmission input shaft 16. And the second speed gear 24 constitute the auxiliary transmission device 14. The first shift gear 19 is constituted by a coil spring (corresponding to a biasing mechanism) 25 shown in FIG.
The shift operation is performed by the slide of the first shift shaft 26 that is pressed and biased toward the middle right, and the second shift gear 22 is
The second shift shaft 28 with the detent mechanism 27 is attached to the knob 2
It is a structure in which a shift operation is performed by a push-pull operation by 8a. The first shift shaft 26 is interlockingly connected to an operation pedal (corresponding to an operation tool) 31 of the control section 8 by a wire 32 via an operation crank 29 and a flexible spring 30.

That is, when the first shift gear 19 is slid toward the main transmission and its claw portion 19a is engaged with the claw portion 24a of the second speed gear 24, the engagement between the first shift gear 19 and the passive gear 21 is released. Then, a low-speed transmission state in which the sub-transmission input shaft 18 and the main transmission input shaft 16 are directly connected appears, and the first shift gear 19 is slid to the belt transmission mechanism side to release the engagement with both the claw portions 19a and 24a. At the same time, when the first shift gear 19 and the passive gear 21 are engaged with each other, a high speed transmission state is established (state of FIG. 3). In the high speed transmission state, the knob 28a is operated to the first speed position on the side of the main transmission to move the second shift gear 22.
1st speed state in which the small-diameter gear portion 22a and the 1st-speed gear 23 mesh with each other, and the knob 28a is operated to the 2nd-speed position on the belt transmission mechanism side so that the large-diameter gear portion 22b of the 2nd shift gear 22 and the 2nd-speed gear 24 It is possible to select the 2nd speed state in which occlusal is engaged, and either of them is set in advance (selected and set according to the field and weather conditions of the day before work). By the way, the gear ratio is increased by 0.751 in the 2nd speed state, increased by 0.826 in the 1st speed state, and about 20% for any high speed transmission state in the low speed transmission state where the gear ratio is 1. The speed is reduced by ~ 30%.

As shown in FIGS. 3 and 4, the operation pedal 31
Is swingable around the lateral fulcrum P, and is switchable between a low speed position L which is upward and a high speed position F which is downward. There is provided a locking mechanism E capable of locking and maintaining the operation pedal 31 which is biased to the low speed position L by the biasing force of the winding spring 25 at the high speed position F by depressing operation against the biasing force. . The locking mechanism E is composed of a lock piece 33 that is swingable around the front-rear axis X, and a tension spring 34 that biases the lock piece 33 to the left in FIG. That is,
With the operation pedal 31 depressed, the lock piece 33 is rotated against the urging force of the tension spring 34, and the recess 3
The operation pedal 31 is inserted into 3a. Then, in this state, the operation pedal 31 can be locked and maintained at the high speed position F against the tension spring 34 due to the biting action by the engagement between the lock claw 33b and the operation pedal 31. To move from this state to the low speed position L, when the operation pedal 31 is depressed a little, the engagement with the lock claw 33b is released and the tension spring 34 causes the lock piece 33 to be released.
4 is forcibly rotated to the left in FIG. 4, the lock maintaining function of the operation pedal 31 at the high speed position F is released, and the winding spring 2
The urging force of 5 automatically returns to the low speed position L.

The operation of the sub-transmission 14 will be described. A locking mechanism E is provided so that a high speed transmission state appears during the cutting operation.
The operation pedal 31 is kept locked at the high speed position F by. Then, when the traveling load increases due to the ground being in a muddy state during traveling, when the operation pedal 31 is depressed, the locking mechanism E is released and the operation pedal 31 is automatically and quickly operated to the low speed position L. The low-speed transmission state has been revealed. When the increase of the traveling load disappears, the operation pedal 31 is moved to the high speed position F according to the procedure described above.
You can keep it locked.

As shown in FIGS. 6 and 7, of the four grounding wheels in the crawler traveling device 9, the first and third first and third wheels 35a and 35c from the front are slightly outward, and The second and fourth rolling wheels 35b and 35d, which are the second and fourth wheels, are arranged slightly inward. This contributes to halving the contact wear by allocating the position of the side surface 35s of the roller wheel that comes into contact with the core metal 9a of the crawler belt 9A to the left and right.

[Other Embodiment] An operation lever having a locking mechanism E is provided in place of the operation pedal 31, and the sub-transmission 14 can be changed from the high speed transmission state to the low speed transmission state with one touch by swinging operation of the operation lever. In other words, the operation of selectively selecting and setting the traveling mission 13 in one of a high speed transmission state by the first speed change mechanism C and a low speed transmission state by the second speed change mechanism D. A tool 31 is provided, and the operating tool 31 is moved from the low speed position L where the low speed transmission state appears to a high speed position F where the high speed transmission state appears by a moving operation against the biasing force of the biasing mechanism 25. The operation tool lock maintaining function at the high speed position F can be released by a moving operation of the operation tool 31 at the high speed position F toward the low speed position L. It is good.

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

[Brief description of drawings]

[Fig. 1] Side view of a strawberries harvester

[Fig. 2] Plan view of the strawberries harvester

FIG. 3 is a system diagram showing an auxiliary transmission and its operating structure.

FIG. 4 is a front view showing a structure of a locking mechanism.

FIG. 5 is a schematic view showing a transmission system for traveling.

FIG. 6 is a plan view showing an arrangement state of grounding wheels.

FIG. 7 is a sectional view of a crawler traveling device.

[Explanation of symbols]

 13 Running Mission 25 Biasing Mechanism 31 Operation Tool C First Speed Change Mechanism D Second Speed Change Mechanism E Locking Mechanism F High Speed Position L Low Speed Position

Claims (1)

[Claims] 1. A traveling mission (13) is provided with a first transmission mechanism (C) and a second transmission mechanism (D) having a gear ratio slightly closer to the deceleration side than the gear ratio of the first transmission mechanism (C). Mechanism (2) for urging the transmission mission (13) to a state where the low speed transmission state by the second speed change mechanism (D) appears.
5) is provided and the traveling mission (13) is provided.
Is provided with an operation tool (31) for selectively selecting and setting the power transmission state of the first transmission mechanism (C) to either a high speed transmission state or a low speed transmission state.
From this low speed position (L) where the low speed transmission state appears, a high speed position (F) where the high speed transmission state appears by a moving operation against the biasing force of the biasing mechanism (25).
Locking operation can be maintained at the high speed position (F) and the operation tool locking at the high speed position (F) is performed by moving the operation tool (31) toward the low speed position (L). A traveling speed change device for a harvesting harvester, comprising a locking mechanism (E) configured to release a maintenance function.