JP3697451B2 - Belt clutch mechanism - Google Patents

Description

  The present invention relates to a belt-type clutch mechanism used in a mobile agricultural machine or the like, and more particularly to a belt-type clutch mechanism that controls on / off of transmission power from an engine via a clutch roller that is in rolling contact with the belt.

  Conventionally, in a mobile agricultural machine such as a combine, the driving force is transmitted from the output shaft of the engine to the grain discharging section etc. via a transmission belt wound between the driving side and driven side pulleys. In this case, the transmission power on / off control is performed by pressing or separating the clutch roller slidably contacted with the transmission belt.

  That is, for example, a clutch operating lever provided on the driver's seat is connected to a clutch arm that is pivotally attached to the base end and has a clutch roller attached to the front end, and the clutch operating lever is swung. A belt-type clutch mechanism has been used in which the clutch arm can be turned on and off by operating the clutch arm.

  However, as described above, according to the means for turning on and off the clutch by pulling the wire connected to the clutch operation lever, a large operation load is required and the clutch operation is difficult.

  Also, according to the conventional belt type clutch mechanism, when the transmission belt is stretched, it is difficult to reliably turn the clutch on and off unless the clutch roller pressure contact amount is increased accordingly. There were problems such as the need to adjust the transmission belt.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a belt type clutch mechanism having a simple structure and capable of applying an appropriate tension to a power transmission belt. .

  In order to achieve the above object, according to the first aspect of the present invention, the base end side of the clutch arm 30 is pivotally attached, and the clutch roller 28 is attached to the front end side so that the drive pulley 20 and the driven pulley 24 are interposed. The clutch roller 28 is disposed so as to be able to make rolling contact with the power transmission belt 26 wound around the belt, and the clutch roller 28 is moved by driving an actuator 32 to control tension and relaxation of the belt 26, and the drive pulley. In the belt type clutch mechanism for controlling on / off of transmission power from the driven pulley 24 to the driven pulley 24, a manual clutch lever 74 for manually operating the clutch arm 30 is provided, and the actuator 32 can be operated even when the manual clutch lever 74 is in the disengaged position. A feature is that the clutch can be switched to the engaged position by driving.

As described above, according to the present invention, the clutch roller is moved by driving the actuator to control the tension of the power transmission belt, and the transmission power from the driving pulley to the driven pulley is controlled to be turned on / off. As a result, the clutch can be easily turned on and off.
Further, since the actuator can be driven to switch the clutch to the on position even when the manual clutch lever is in the disengaged position, the actuator can be driven independently of the operation of the manual clutch lever.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view of a combine to which the present invention is applied. A combine C has a pre-processing unit 2 that can move vertically and horizontally with respect to the traveling machine body 1 at the front part of the traveling machine body 1. . This traveling machine body 1 is supported by a crawler traveling device (not shown), threshing the harvested culm and selecting the threshed grain, the grain tank 4 for temporarily storing the selected grain, It has a discharge cylinder 5 for carrying the straw in the grain tank 4 out of the machine, and the drained straw that has been threshed is discharged by the post-processing unit 6.

  The discharge cylinder 5 has a vertical spiral cylinder 11 and a horizontal spiral cylinder 12 each containing a helical shaft, and the grains in the grain tank 4 are installed horizontally at the bottom of the grain tank 4. The horizontal spiral shaft 13 is transferred to the lower part of the vertical spiral cylinder 11 and is carried out of the vertical spiral cylinder 11 through the horizontal spiral cylinder 12.

  A driver's seat 7 is provided at the upper part of the fuselage, and a continuously variable transmission lever 10 for controlling the speed of the aircraft is provided on the side of the side panel 9 of the driver's seat 7. Is provided with a discharge clutch switch 56 for controlling on / off of power from the engine to the drive mechanism of the discharge cylinder 5.

  When the discharge clutch switch 56 is turned on, the power from the engine is driven by the belt-type clutch mechanism 14 from the counter shaft pulley (drive pulley) 20 through the horizontal spiral shaft pulley (driven pulley) 24 to the horizontal in the grain tank 4. It is transmitted to the helical shaft 13. In addition, the code | symbol 84 is a tank open lever for rotating the said grain tank 4 to the side.

  2 to 4 are diagrams showing details of the belt-type clutch mechanism 14, and a power transmission belt 26 is wound between the countershaft pulley 20 and the lateral spiral shaft pulley 24. A clutch roller 28 is arranged at 26 so as to be capable of rolling. The clutch roller 28 is supported by a distal end portion of a clutch arm 30 whose base end portion is pivotally supported by a pivot 29.

  The clutch roller 28 is pressed against or separated from the belt 26 to control the tension of the belt 26, and the transmission power from the countershaft pulley 20 to the lateral spiral shaft pulley 24 is turned on / off. Is done.

  That is, as shown in FIG. 5, a clutch motor 32 as an actuator is provided at an intermediate position between the counter shaft pulley 20 and the lateral spiral shaft pulley 24, and the power of the clutch motor 32 is reduced by a reduction gear portion. It is transmitted to the output gear 36 via 34. The output gear 36 meshes with a fan-shaped swinging gear 38 that can swing around the pivot 29. A plate 40 is erected and fixed to the oscillating gear 38 in the vicinity of the end face 38 a on the pivot start end side (clutch disengagement side) with the pivot 29 as the center.

  On the other hand, one end of a shaft 44 extending toward the plate 40 is fixed to an intermediate portion in the longitudinal direction of the clutch arm 30, and the other end of the shaft 44 is a long hole formed in the plate 40. 40a is inserted. A spring (compression) 46 is attached between the clutch arm 30 and the plate 40 along the shaft 44.

As described above, when the clutch motor 32 is driven and the output gear 36 rotates in the clockwise direction in FIG. 5, the swinging gear 38 meshing with it rotates in the counterclockwise direction around the pivot 29, Is transmitted to the clutch arm 30 via the spring 46. Thus, the clutch arm 30 rotates counterclockwise about the pivot 29, the clutch roller 28 contacts the belt 26, and the belt 26 is tensioned to enter the clutch "ON" state.

  When the clutch motor 32 is driven in the opposite direction, the oscillating gear 38 rotates in the opposite direction and returns to the original position, and the clutch roller 28 is separated from the belt 26. Loosen and the clutch is disengaged. The end face 38a on the rotation start end side (clutch disengagement side) of the swing gear 38 is in contact with the lower limit stopper 48 and its position is regulated.

  Further, a spring mounting hole 50 is provided on the base end side of the clutch arm 30, and a return spring 52 is stretched between the spring mounting hole 50 and the body frame. Due to the urging force of the return spring 52, the clutch arm 30 returns substantially integrally with the swing gear 38 when the clutch is disengaged.

  Here, in the present invention, a controller that drives and controls the actuator 32 based on the clutch on / off signal, and a forward rotation that drives the actuator 32 in the forward direction and tensions the belt 26 based on the clutch on / off signal. Timer setting means capable of setting a timer time.

  As shown in FIG. 6, the control unit 58 with a built-in CPU is provided with timer setting means 62, and via the control unit 58, a discharge clutch switch 56 that controls the discharge cylinder 5, The clutch motor 32 that is driven and controlled based on a signal from the discharge clutch switch 56 is connected.

  Based on the clutch engagement signal from the discharge clutch switch 56, the timer setting means 62 can set a forward rotation timer time TON for driving the clutch motor 32 in the forward rotation direction and tensioning the belt 26. Yes.

  When a clutch engagement signal is sent from the discharge clutch switch 56, the clutch motor 32 is driven in the forward direction for the normal rotation timer time TON via the control unit 58, and the clutch roller 28 is pressed against the belt 26. Thus, the belt 26 is urged in a tensioning direction, and the clutch is engaged.

  Further, the clutch roller 28 is stopped at a position where the biasing force in the direction of tensioning the belt 26 by the clutch roller 28 and the reaction force from the belt 26 are balanced. In this balanced state, when the forward rotation timer time TON elapses, the forward drive of the clutch motor 32 is stopped, and thereafter, the clutch roller 28 is held in position by the holding force of the clutch motor 32 in the clutch engaged state. The

  In order to disconnect the clutch, for example, the clutch motor 32 is driven to rotate in the reverse direction based on the clutch disconnection signal from the discharge clutch switch 56, and the clutch is switched to the “disengaged” state. It can be considered that the clutch motor 32 is stopped by being detected by a detection switch or the like disposed at the original position. Alternatively, the clutch may be disengaged by shutting off the energization of the clutch motor 32 based on the clutch disengagement signal and returning the clutch arm 30 to the original position by the urging force of the return spring 52.

Next, in the present invention, the timer setting means 62 can set a reverse rotation timer time TOFF for relaxing the tension of the belt 26 by driving the clutch motor 32 in the reverse direction based on the clutch disengagement signal. The forward timer time TON is set longer than the reverse timer time TOFF.

  That is, in this case, in order to engage the clutch, the clutch motor 32 is driven in the normal rotation direction for the normal rotation timer time TON based on the clutch engagement signal from the discharge clutch switch 56 as described above, and the clutch is turned on. The clutch engaged state is maintained. In order to disengage the clutch, the clutch motor 32 is driven in the reverse direction for the reverse rotation timer time TOFF based on the clutch disengagement signal from the discharge clutch switch 56 and the clutch roller 28 is separated from the belt 26 via the clutch arm 30. Then, the clutch is disengaged.

  FIG. 7 shows an operation timing chart in the present embodiment.

  In the figure, when the discharge clutch switch 56 is switched from OFF to ON, the clutch motor 32 starts driving at the rise of this signal, and rotates in the forward direction for the forward rotation timer time TON and stops. At this time, the clutch motor 32 stops at a position where the biasing force that biases the belt 26 in the direction in which the clutch roller 28 tensions the reaction force from the belt 26 is balanced. Before the clutch motor 32 stops, the belt 26 is tensioned and the clutch is in the “on” state.

  Further, when the discharge clutch switch 56 is switched from “ON” to “OFF”, the clutch motor 32 which has been held in the position starts driving in the reverse rotation direction at the fall of this signal, and only during the reverse rotation timer time TOFF. Rotate to stop. Note that immediately after the clutch motor 32 rotates in the reverse direction, the belt 26 is relaxed and the clutch is in the “disengaged” state.

  FIG. 8 shows a control flowchart in the present embodiment. In step S1, it is determined whether or not the discharge clutch switch 56 has been operated to “ON”. It is determined whether or not the turn timer time TON has elapsed. If the forward rotation timer time TON has not elapsed, the clutch motor 32 is driven in the forward direction in S3, and if the forward rotation timer time TON has elapsed, the driving of the clutch motor 32 is stopped in S4 (clutch “ ON state).

  In S1, if the discharge clutch switch 56 is not operated to "ON", the process proceeds to S5. In S5, it is determined whether or not the discharge clutch switch 56 is operated to "OFF". If the switch 56 is operated to “OFF”, it is determined in S6 whether or not the reverse rotation timer time TOFF has elapsed. If the reverse rotation timer time TOFF has elapsed, the driving of the clutch motor 32 is stopped in S4. To do. If the reverse rotation timer time TOFF has not elapsed in S6, the process proceeds to S7 to drive the clutch motor 32 in the reverse direction.

  In this embodiment, the forward rotation timer time TON is set to about 4 seconds, and the reverse rotation timer time TOFF is set to about 2 to 3 seconds. This is because, in order to tension the belt 26, the clutch motor 32 needs to be driven in the positive direction against the reaction force of the belt 26, so that a predetermined time is required, whereas the belt 26 is relaxed. This is because the clutch motor 32 only needs to move in the same direction as the reaction force of the belt 26, so that it takes less time to relax the belt 26.

  In the present invention, the spring 46 mounted between the rocking gear 38 and the clutch arm 30 is fixed to one of the rocking gear 38 and the clutch arm 30 and is relative to the other. It is engaged along a shaft 44 that is movably supported.

As described above, the shaft 44 extends from the intermediate portion in the longitudinal direction of the clutch arm 30 toward the plate 40 that is erected and fixed to one end portion of the swinging gear 38. The spring 46 is attached.

  As shown in FIGS. 9 and 10, the shaft 44 is integrally fixed to the clutch arm 30 at the base end side, and a long hole 40a is formed in the plate 40, and the shaft 40 is formed in the long hole 40a. The front end side of 44 is inserted. A washer 64 is inserted at the front end side of the shaft 44, and the spring 46 is mounted between the washer 64 and the clutch arm 30, and the washer 64 is prevented from coming off by a pin 66.

  FIG. 11 shows another embodiment of the mounting means of the spring 46. In this embodiment, two washers 64, 64 are inserted so as to sandwich the plate 40 on the tip end side of the shaft 44. The outer washer 64 is retained by a pin 66.

  Furthermore, in the present invention, the clutch arm 30 is provided with a manual clutch lever 74 via an accommodation mechanism.

  As shown in FIGS. 4 and 5 described above, a guide plate 68 is attached to the side wall of the grain tank 4, and a guide groove 70 is formed in the guide plate 68. Further, a fulcrum shaft 72 is planted from the guide plate 68, and an intermediate side of the manual clutch lever 74 is rotatably attached to the fulcrum shaft 72. The operating point side of the clutch lever 74 is pivotally attached to the clutch arm 30 via a connecting link 76 and pins 78 and 80.

  On the other hand, the clutch arm 30 is formed with an oval hole 82, and the pin 80 is fitted into the oval hole 82 so as to be movable in the oval hole 82. The connecting link 76, the pin 80, and the oval hole 82 constitute an accommodation mechanism.

  Even when the manual clutch lever 74 is manually operated by this accommodation mechanism and the clutch is switched to the “disengaged” position in FIG. 5, the discharge clutch switch 56 is turned on independently of the manual operation. The motor 32 can be driven to switch the clutch to the “on” position.

1 is an overall plan view of a combine to which the present invention is applied. It is a front view of a belt type clutch mechanism concerning the present invention. It is a top view of a belt type clutch mechanism. It is a side view of the guide plate of a manual clutch lever. It is an enlarged front view of a belt type clutch mechanism. It is a control block diagram in the present embodiment. It is a figure which shows the timing chart in this Embodiment. It is a figure which shows the control flowchart in this Embodiment. It is a front view of the attachment state of a spring. It is a top view of the attachment state of a spring. It is a front view in other embodiments of the attachment state of a spring.

Explanation of symbols

14 Belt type clutch mechanism 20 Counter shaft pulley (drive pulley)
24 Horizontal spiral pulley (driven pulley)
26 Power Transmission Belt 28 Clutch Roller 30 Clutch Arm 32 Clutch Motor (Actuator)
74 Manual clutch lever

Claims (1)

The base end side of the clutch arm (30) is pivotally attached and the clutch roller (28) is attached to the front end side,
The clutch roller (28) is disposed so as to be capable of rolling contact with a power transmission belt (26) wound between a driving pulley (20) and a driven pulley (24),
The clutch roller (28) is moved by driving the actuator (32) to control the tension of the power transmission belt (26), and the transmission power from the drive pulley (20) to the driven pulley (24) is controlled. In the belt-type clutch mechanism that controls on / off,
A manual clutch lever (74) for manually operating the clutch arm (30) is provided;
A belt-type clutch mechanism configured so that the actuator (32) can be driven to switch the clutch to the on position even when the manual clutch lever (74) is in the disengaged position.

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