JPH0893871A - Travelling motive power intermitting device of moving agricultural machinery - Google Patents

Abstract

PURPOSE: To provide a travelling motive power intermitting device of a mobile agricultural machinery arranging a pedal shaft between a driving frame and a transmission case and capable of holding high rigidity without being influenced by torsion of a machinery frame. CONSTITUTION: A pedal shaft 6 axially supporting a clutch pedal 7 free to revolve is arranged orthogonal with the frame forwarding direction between a driving frame 1 and a transmission case, a revolving fulcrum of a tight arm 17 axially supporting a tight pulley 15 and a revolving fulcrum of a clutch arm 8 revolving the tight arm 17 are respectively arranged in parallel with the pedal shaft 6, and the clutch arm 8 is connected to the clutch pedal 7 through a connecting rod 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling power connecting / disconnecting device mounted on an agricultural tractor or the like, and particularly to a drive pulley on the engine side and a driven pulley on the transmission case side in conjunction with a depression operation of a clutch pedal. The present invention relates to a traveling power connecting / disconnecting device for a mobile agricultural machine, which is configured to disengage a clutch by tightening a transmission belt stretched between them.

[0002]

2. Description of the Related Art Conventionally, as a traveling power connecting / disconnecting device mounted on an agricultural tractor or the like, a transmission belt is provided between a drive pulley provided on an output shaft on the engine side and a driven pulley provided on an input shaft on the transmission case side. It is known that the driven pulley is suspended and a clutch mechanism is attached to the driven pulley. When the position of the clutch pedal and the mission are largely separated from each other, this type of traveling power disconnecting device complicates the configuration of the link mechanism that connects the pedal shaft supporting the clutch pedal and the mission, and increases the number of parts. Not only is it difficult to adjust the clutch operation and perform maintenance work, but it also requires a large installation space and it is difficult to obtain an appropriate layout and configuration within the limited airframe. Therefore, it has been proposed to connect the pedal shaft to the clutch mechanism on the mission side with a wire (Actually, Sho 52).
-17736). With the above configuration, although the clutch pedal can be connected to the mission without requiring a complicated link mechanism, since the connecting wire is curved in a narrow space inside the body, a large stepping force is required when operating the clutch pedal. In addition, each time the pedal is stepped on, a tensile force is applied to the connecting wire, so that the connecting wire extends and the play of the clutch pedal becomes unnecessarily large.Therefore, the clutch pedal play must be adjusted frequently. Moreover, since the pedal shaft supporting the clutch pedal is attached to the machine body frame, it has a drawback that it is easily affected by the twist of the frame.

[0003]

SUMMARY OF THE INVENTION The present invention was devised in view of the above situation to solve the problems of the prior art, and the object thereof is to connect without using a connecting wire. The clutch pedal and the mission can be connected with a simple structure via the rod, and the pedal shaft is placed between the driving frame and the mission case, which is high without being affected by the twist of the body frame. It is intended to provide a traveling power connecting / disconnecting device for a mobile agricultural machine capable of maintaining rigidity.

[0004]

In order to solve the problems, a first technical means adopted by the present invention is to provide a drive pulley and a driven pulley respectively on an output shaft of an engine and an input shaft of a transmission case, and A tight pulley that responds to the pedal operation of the clutch pedal is pressed against the tensioned area of the transmission belt that is suspended between the two pulleys, and the clutch is disengaged by the looseness of the transmission belt that is linked to the depression operation of the clutch pedal. A traveling power connecting / disconnecting device for a mobile agricultural machine, wherein a pedal shaft that rotatably supports the clutch pedal is disposed between the driving frame and the transmission case in a direction orthogonal to the machine traveling direction, and A rotation fulcrum of a tight arm that pivotally supports the tight pulley and a rotation fulcrum of a clutch arm that rotates the tight arm are respectively provided on the pedal shaft. The clutch arms are arranged in parallel, and the clutch arm is connected to a clutch pedal via a connecting rod. As a second technical means, a tight arm that pivotally supports the tight pulley and a clutch via the connecting rod are provided. A clutch arm connected to the pedal is rotatably provided on the same support shaft that is spaced apart in parallel with the pedal shaft, and when the clutch arm is rotated in association with the depression operation of the clutch pedal. The clutch arm is constituted so that the clutch is switched to the disengaged state by the rotation of the tight arm that abuts against the clutch arm, and as a third technical means, the pivot shaft of the tight pulley provided at the tip of the tight arm is used as the clutch arm. When the clutch arm that extends to the side and rotates in linkage with the depression operation of the clutch pedal is brought into contact with the pivot shaft, It is characterized in that it has configured to rotate to the cross-sectional side of the latch.

[0005]

Therefore, according to the present invention, by disposing the pedal shaft between the driving frame and the transmission case, it is possible to enhance the mounting rigidity thereof, and
The stepping operation force of the clutch pedal can be reliably transmitted to the clutch arm via the connecting rod, and stable power connection / disconnection can be performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described in detail with reference to an embodiment shown in the drawings. In the figure, reference numeral 1 is a box-shaped operation frame for constituting a floor surface of a driver's seat of a mobile agricultural machine, and the operation frame 1 is a mission case 3 equipped with an HST mechanism 2 having a continuously variable transmission function at a higher level. And the HST mechanism 2 is located inside the driving frame 1 and above the driving frame 1.
A pedal shaft 6 orthogonal to the machine body traveling direction is disposed between the inner surface of one side and the HST mechanism 2 via a mounting bracket 4 and a clutch arm bracket 5, and is pivotally supported by the pedal shaft 6. The clutch arm 8 described later is rotated by the depression operation of the clutch pedal 7, and the clutch mechanism (not shown) is intermittently controlled.

The clutch arm bracket 5 has an H
A through hole 5a for inserting the input shaft 3a of the ST mechanism 2 and mounting holes 5b, 5b for connecting the HST mechanism 2 and the mission case 3 are provided, and a support shaft 9 for inserting the clutch arm 8 therein. Is fixed in parallel with the pedal shaft 6 by penetrating the front and back surfaces of the clutch arm bracket 5, and the clutch arm bracket 5 inserted through the input shaft 3a is mounted on the transmission case 3 via bolts 10 and 10.
The clutch arm 8 fitted to the support shaft 9 is attached to the pedal shaft 6 side via a connecting rod 12 around which an adjusting screw portion 11 is provided and an adjusting bracket 13. Connected to 14,
Connecting rod 1 that is interlocked with the operation of the clutch pedal 7
The clutch arm 8 is rotated around the support shaft 9 by the forward / backward movement of 2.

The base end of a tight arm 17 having a tight pulley 15 at its tip via a pivot shaft 16 is fitted to the other end of the support shaft 9 into which the clutch arm 8 is fitted. The contact portion 16a of the pivot shaft 16 that extends through the tight arm 17 to the clutch arm 8 side is
By contacting the stepped notch 8a formed at the tip of the clutch arm 8 with a required play A, the tight arm 17 is rotated in association with the rotation operation of the clutch arm 8. Has become.

On the other hand, the output shaft of the engine (not shown) and the input shaft 3 of the HST mechanism 2 provided side by side with the mission case 3
a includes a drive pulley 18 and a pair of driven pulleys 19, 19
Are respectively rotatably supported, and the tight pulley 15 is provided in a stretched area of the transmission belt 20 suspended between the pulleys 18 and 19.
The rotation surface 15a of the above is surface-mounted from above, and the above-mentioned transmission belt 20 is held in tension via the tight pulley 15 by the downward pressure contact force of the tight arm 17 urged by the tight spring 21, and the clutch pedal 7 of The clutch arm 8 is rotated by the forward / backward movement of the connecting rod 12 which is interlocked with the stepping operation, and the tight arm 17 abutting on the notch portion 8a at the tip thereof is also rotated with the rotation of the clutch arm 8 to move the tight pulley. By releasing the pressure contact force of 15 with respect to the transmission belt 20, the tension of the transmission belt 20 is relaxed and the driving force is temporarily cut off. In this state, the driven pulley 19 is operated by operating the clutch mechanism provided on the transmission case 3 side.
The transmission belt 20 is switched between 19 by the HST mechanism 2 so that the transmission of the driving force is continuously changed.

Reference numerals 22 and 22 are belt guides located near the tight pulley 15 for restricting suspension of the transmission belt 20, 23 is a pedal spring for applying an urging force to the clutch pedal 7, and 24 is a depression of the clutch pedal 7. It is a brake rod that operates a brake mechanism in the mission case 3 by operation.

Since the present invention is constructed as described above,
When the clutch pedal 7 is depressed, the connecting rod 12
The clutch arm 8 is rotated through the clutch arm 8 and the notch portion 8a at its tip end contacts the contact portion 16a of the pivot shaft 16 after a predetermined play A, and the tight arm 17 is also rotated. Then, as the tight arm 17 rotates, the tight pulley 15 pivotally supported at the tip of the tight arm 17 pivots upward against the bias of the tight spring 21 to release the tension of the transmission belt 20 and drive it. The transmission of the driving force from the pulley 18 to the driven pulley 19 is cut off.

The pedal shaft 6, which directly receives the operating force applied to the clutch pedal 7 when the clutch pedal 7 is depressed, is fixed to the mission case 3 via the inner surface of one side of the driving frame 1 and the clutch arm bracket 5. Since it is firmly supported between the HST mechanism 2 and the two members 1 and 3 having high strength, it is possible to suppress rattling and variations in the mounting dimensions of the pedal shaft 6 as much as possible. It is possible to maintain a stable pedal operation state.

Further, the support shaft 9 pivotally supporting the clutch arm 8 and the tight arm 17 interlocked with the rotation of the pedal shaft 6 is arranged parallel to the pedal shaft 6, so that the connecting rod 12 is With the simple structure, the rotation of the pedal shaft 6 can be directly changed to the clutch arm 8
Since the clutch arm 8 and the tight arm 17 are pivotally supported by the same support shaft 9, it is possible to reduce the deviation of the mounting dimension during assembly, inspection and maintenance. .

Further, the notch 8a formed at the tip of the clutch arm 8 directly contacts the contact portion 16a of the pivot shaft 16 pivotally supported on the tight arm 17 side with a predetermined play A. Therefore, the interlocking relationship between both arms 8 and 17 can be stably and reliably maintained.

In this embodiment, when adjusting the dead zone when the clutch pedal 7 is depressed, that is, the play A between the clutch arm 8 and the tight arm 17, a notch formed at the tip of the clutch arm 8 is adjusted. The predetermined play A can be easily obtained without using a measuring tool such as a gauge simply by adjusting so that the lower surface of the contact portion 16a on the tight arm 17 side is located at the upper edge position where the step of 8a starts. .

[0016]

In summary, according to the present invention, a drive pulley and a driven pulley are provided on an output shaft of an engine and an input shaft of a transmission case, respectively, and a clutch pedal of a clutch pedal is provided in a stretched region of a transmission belt suspended between the pulleys. A traveling power disconnecting device for a mobile agricultural machine configured to press a tight pulley that responds to pedal operation and to disconnect and engage the clutch by tightening or loosening a transmission belt that is connected to a depression operation of a clutch pedal,
A pedal shaft rotatably supporting the clutch pedal is disposed between the driving frame and the transmission case in a direction orthogonal to the traveling direction of the machine body, and a rotation fulcrum of a tight arm pivotally supporting the tight pulley. And a rotation fulcrum of a clutch arm for rotating the tight arm are arranged in parallel with the pedal shaft, and the clutch arm is connected to the clutch pedal via a connecting rod. As a technical means of the above, a tight arm that pivotally supports the tight pulley and a clutch arm that is connected to a clutch pedal via a connecting rod are respectively rotated around the same support shaft that is spaced apart in parallel with the pedal shaft. It is movably installed and contacts the clutch arm when the clutch arm is rotated in connection with the operation of depressing the clutch pedal. The clutch is switched to the disengaged state by the rotation of the tight arm. Further, as a third technical means, the pivot shaft of the tight pulley provided at the tip of the tight arm is extended to the clutch arm side and the clutch pedal Since the tight arm is configured to rotate to the disengaged side of the clutch when the clutch arm that rotates in connection with the stepping operation is brought into contact with the pivot shaft, the clutch pedal is operated when the clutch pedal is stepped on. The pedal shaft that directly receives the operation force of is strongly supported between the inner surface on one side of the driving frame and the transmission case via the clutch arm bracket, that is, between the above two members having high strength. It is possible to suppress variations in mounting dimensions of the pedal shaft and the pedal shaft as much as possible, and to maintain a stable pedal operation state. Since the support shaft that pivotally supports the clutch arm and the tight arm is arranged in parallel with the pedal shaft,
With a simple structure via a connecting rod, the rotational movement of the pedal shaft can be reliably transmitted to the clutch arm as it is. Moreover, the clutch arm and the tight arm are pivotally supported by the same support shaft, so during assembly and inspection. In addition, the installation dimension is less likely to be misaligned during maintenance. Since the tip of the clutch arm directly contacts the pivot shaft that is pivotally supported on the tight arm side, the interlocking relationship between both arms can be stably and reliably maintained. And the like, which are extremely useful new effects.

[0017]

[Brief description of drawings]

FIG. 1A is a front view of a main part. (B) is a side view same as the above.

FIG. 2 is an exploded perspective view of a main part.

FIG. 3A is a front view of relevant parts showing a state in which a driven pulley that suspends a transmission belt and a clutch arm bracket are attached to each other. (B) is a side view of the main part of the same.

[Explanation of symbols]

 1 Driving Frame 3 Mission Case 3a Input Shaft (HST Mechanism) 6 Pedal Shaft 7 Clutch Pedal 8 Clutch Arm 9 Support Shaft 15 Tight Pulley 16 Pivot Shaft 17 Tight Arm 18 Drive Pulley 19 Driven Pulley 20 Transmission Belt 12 Connecting Rod

Claims (3)

[Claims] 1. A tight pulley which is provided with a drive pulley and a driven pulley on an output shaft of an engine and an input shaft of a transmission case, and which is responsive to pedal operation of a clutch pedal in a stretched region of a transmission belt suspended between the pulleys. A traveling power disconnecting device for a mobile agricultural machine, which is configured to engage and disengage the clutch by tightly engaging a transmission belt linked to the depression operation of the clutch pedal, the pedal rotatably supporting the clutch pedal. The shaft is arranged between the driving frame and the mission case in a direction orthogonal to the traveling direction of the machine body, and the rotation fulcrum of the tight arm that pivotally supports the tight pulley and the clutch arm that rotates the tight arm. Rotation fulcrums are respectively arranged in parallel with the pedal shaft, and the clutch arm serves as a clutch pedal via a connecting rod. A running power connection / disconnection device for mobile agricultural machines characterized by being connected. 2. A tight pulley which is provided with a drive pulley and a driven pulley on an output shaft of an engine and an input shaft of a transmission case, and which is responsive to pedal operation of a clutch pedal in a stretched region of a transmission belt suspended between the pulleys. A traveling power connecting / disconnecting device for a mobile agricultural machine configured to press and hold the clutch and to disengage the clutch by tightening and loosening the transmission belt depending on the strength of the press contact operation, wherein the pedal shaft pivotally supports the clutch pedal. , Is provided between the driving frame and the mission case in a direction orthogonal to the machine traveling direction,
A tight arm that pivotally supports the tight pulley and a clutch arm that is connected to a clutch pedal via a connecting rod are rotatably provided on the same support shaft that is spaced apart in parallel with the pedal shaft. When the clutch arm is rotated in connection with the pedal depression operation,
A traveling power connecting / disconnecting device for a mobile agricultural machine, characterized in that the clutch is switched to be disengaged by rotation of a tight arm abutting on the clutch arm. 3. A drive shaft and a driven pulley are respectively provided on an output shaft of an engine and an input shaft of a transmission case, and a tight pulley which responds to a pedal operation of a clutch pedal in a stretched region of a transmission belt suspended between the pulleys. A traveling power connecting / disconnecting device for a mobile agricultural machine configured to press and hold the clutch and to disengage the clutch by tightening and loosening the transmission belt depending on the strength of the press contact operation, wherein the pedal shaft pivotally supports the clutch pedal. A pedal arm, which is provided between the driving frame and the transmission case in a direction orthogonal to the traveling direction of the machine body and axially supports the tight pulley, and a clutch arm which is connected to a clutch pedal via a connecting rod. Rotatably mounted on the same support shafts that are spaced apart in parallel with each other, and at the end of the tight arm. When the pivot shaft of the wheel pulley is extended to the clutch arm side, and the clutch arm that rotates in association with the depression operation of the clutch pedal is brought into contact with the pivot shaft,
A traveling power connecting / disconnecting device for a mobile agricultural machine, wherein a tight arm is configured to rotate to a disengaged side of a clutch.