JP3556820B2 - Belt type clutch mechanism - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
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 rotatably connected to a belt.
[0002]
[Prior art]
Conventionally, in a mobile agricultural machine such as a combine, transmission of a driving force from an output shaft of an engine to a grain discharge unit or the like is performed through a transmission belt wound between pulleys on a driving side and a driven side. In this case, the on / off control of the transmission power is performed by pressing or releasing the clutch roller slidably contacting the transmission belt.
[0003]
That is, for example, a clutch operating lever provided in the driver's seat is connected via a wire to a clutch arm having a base end pivotally attached thereto and a clutch roller attached to the distal end, and the clutch operating lever is swung. A belt-type clutch mechanism that allows the clutch arm to swing by operating the clutch arm has been used.
[0004]
[Problems to be solved by the invention]
However, as described above, according to the means for engaging and disengaging the clutch by pulling the wire connected to the clutch operating lever, a large operating load is required, and it has been difficult to operate the clutch.
[0005]
Further, according to the conventional belt-type clutch mechanism, when the transmission belt is stretched, it is difficult to reliably engage and disengage the clutch unless the pressure contact amount of the clutch roller is increased accordingly. There were problems such as the need to adjust the transmission belt.
[0006]
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 appropriate tension to a power transmission belt. .
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a clutch roller (28) is rotatably connected to a power transmission belt (26) wound between a driving pulley (20) and a driven pulley (24). The clutch roller (28) is moved by the drive of an actuator (32) to control the tension and relaxation of the belt (26), and the transmission from the drive pulley (20) to the driven pulley (24). In a belt-type clutch mechanism that controls power on / off,
A resilient member (46) interposed between the actuator (32) and the clutch roller (28) for urging the clutch roller in a direction in which the tension of the belt (26) is tightened;
A control unit (58) for driving and controlling the actuator (32) based on a clutch on / off signal;
Timer setting means (62) capable of setting a normal rotation timer time for driving the actuator (32) in the forward direction based on a clutch engagement signal to tighten the tension of the belt (26);
When the clutch is engaged, the actuator (32) is driven for the forward rotation timer time to urge the belt (26) through the elastic member (46) in the direction of tension, and is in a state of tension with the urging force. The drive of the actuator (32) is stopped at a position where the reaction force from the belt (26) is balanced, and the position is maintained.
[0009]
The invention according to claim 2 is characterized in that the actuator (32) is a motor, and the actuator (32) is arranged between a rocking body (38) that rocks by rotation of the motor and a clutch arm (30) supporting the clutch roller (28). swinging body (38) said resilient member (46) that said biasing the clutch arm (30) in accordance with the displacement amount of is interposed, elastic onset member (46), said oscillator (38) And a clutch arm (30), which is fixed along one of the support members (44) movably supported relative to one of the other.
[0010]
The invention according to claim 3 is characterized in that the clutch arm (30) is provided with a manual clutch lever (74) via a accommodation mechanism (76, 80, 82).
[0011]
The invention according to claim 4 is characterized in that the clutch is applied to a clutch that turns on / off power to a paddy discharging auger of a mobile reaper (C).
[0012]
[Action]
Based on the above-mentioned invention specific matter, the belt-type clutch mechanism (14) of the present invention arranges a clutch roller (28) in a rotatable manner on a power transmission belt (26), and connects the clutch roller (28) to an actuator (32). ) Is driven via the resilient member (46) to control the tension and relaxation of the belt (26) so as to control the transmission power on and off, and to control the actuator (32). A timer setting means (62) capable of setting a forward rotation timer time (T _ON ) for driving in the forward direction via the section (58).
[0013]
Then, based on the clutch ON signal, the actuator (32) is driven by the forward rotation timer time _{(T ON),} said clutch rollers (28) Belt (26) is tensioned via the resilient member (46) Bias in the direction. That is, in the present invention, it is intended to control the driving time of the actuator (32) to put the clutch into the engaged state.
[0014]
At this time, the clutch roller (28) balances the urging force of the actuator (32) in the direction of tensioning the belt (26) from the resilient member (46) with the reaction force of the tensioned belt (26). When the forward rotation timer time (T _ON ) elapses, the drive of the actuator (32) is stopped, and the clutch is kept in the engaged state. The roller (28) is held in position.
[0015]
In addition, the code | symbol in a parenthesis mentioned above is for contrast of drawing, and does not limit the invention specific matter of this invention at all.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
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 up and down and left and right with respect to the traveling body 1 at the front of the traveling body 1. . The traveling machine 1 is supported by a crawler traveling device (not shown), threshing a harvested grain culm and sorting the threshed grain, a grain tank 4 for temporarily storing the sorted grain, and a grain tank 4. It has a discharge cylinder 5 for carrying out the paddy in the grain tank 4 outside the machine, and the threshed straw is discharged by the post-processing unit 6.
[0018]
The discharge cylinder 5 has a vertical spiral cylinder 11 and a horizontal spiral cylinder 12 each accommodating a spiral shaft therein, and the grains in the grain tank 4 are laterally provided at the bottom of the grain tank 4. It is transferred to the lower part of the vertical spiral cylinder 11 by the horizontal spiral shaft 13 and is carried out of the vertical spiral cylinder 11 through the horizontal spiral cylinder 12 to the outside of the machine.
[0019]
A driver's seat 7 is provided on the upper part of the fuselage, and a continuously variable transmission lever 10 for controlling the vehicle speed is provided on a side portion of the side panel 9 of the driver's seat 7. Is provided with a discharge clutch switch 56 that controls the on / off control of the power from the engine to the drive mechanism of the discharge cylinder 5.
[0020]
When the discharge clutch switch 56 is turned on, power from the engine is transmitted from the counter shaft pulley 20 to the horizontal spiral shaft 13 in the grain tank 4 via the horizontal spiral shaft pulley 24 by the belt type clutch mechanism 14. Reference numeral 84 denotes a tank open lever for rotating the grain tank 4 to the side.
[0021]
FIGS. 2 to 4 are views showing the details of the belt-type clutch mechanism 14. A power transmission belt 26 is wound between a counter shaft pulley 20 and a horizontal spiral shaft pulley 24. A clutch roller 28 is rotatably disposed at 26. The clutch roller 28 is supported by a distal end of a clutch arm 30 having a base end pivotally mounted on a pivot 29.
[0022]
When the clutch roller 28 is pressed against or separated from the belt 26, the tension of the belt 26 is controlled to be tensioned and relaxed, and the transmission power from the counter shaft pulley 20 to the horizontal spiral shaft pulley 24 is turned on and off. Is done.
[0023]
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 horizontal spiral shaft pulley 24, and the power of the clutch motor 32 is reduced by a reduction gear unit. The power is transmitted to the output gear 36 via the power transmission line 34. The output gear 36 meshes with a sector-shaped swing gear 38 that can swing about the pivot 29. A plate 40 is fixed to the swing gear 38 in the vicinity of an end surface 38a on the rotation start end side (clutch disengagement side) about the pivot 29.
[0024]
On the other hand, one end of a shaft 44 extending toward the plate 40 is fixed to an intermediate portion of the clutch arm 30 in the longitudinal direction, and the other end of the shaft 44 is a long hole formed in the plate 40. 40a. A spring (compression) 46 is mounted between the clutch arm 30 and the plate 40 along the shaft 44.
[0025]
As described above, when the clutch motor 32 is driven and the output gear 36 rotates clockwise in FIG. 5, the swing gear 38 meshing with the output gear 36 rotates counterclockwise about the pivot 29, and the swing gear 38 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 abuts on the belt 26, and tensions the belt 26 to bring the clutch into the "on" state.
[0026]
When the clutch motor 32 is driven in the opposite direction, the swing gear 38 rotates in the opposite direction and returns to the original position, the clutch roller 28 separates from the belt 26, and the belt 26 The clutch is released and the clutch is set to the "off" state. The end surface 38a of the swing gear 38 on the rotation start end side (clutch disengagement side) abuts on the lower limit stopper 48, and its position is regulated.
[0027]
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 machine body frame. The biasing force of the return spring 52 causes the clutch arm 30 to return substantially integrally with the swing gear 38 when the clutch is disengaged.
[0028]
Here, in the present invention, a control unit that drives and controls the actuator 32 based on a clutch on / off signal, and a forward rotation that drives the actuator 32 in the forward direction based on a clutch on / off signal to tension the belt 26. And timer setting means for setting a timer time.
[0029]
As shown in FIG. 6, a control unit 58 having a built-in CPU is provided with a timer setting unit 62, and through the control unit 58, a discharge clutch switch 56 for controlling the discharge cylinder 5, The clutch motor 32, which is driven and controlled based on a signal from the discharge clutch switch 56, is connected.
[0030]
The timer setting means 62 can set a normal rotation timer time T _ON for driving the clutch motor 32 in the normal rotation direction to tighten the tension of the belt 26 based on the clutch engagement signal from the discharge clutch switch 56. ing.
[0031]
When the clutch ON signal is sent from the discharge clutch switch 56, the clutch motor 32 via the control unit 58 only forward timer time T _ON is driven in the forward direction, said clutch roller 28 to the belt 26 pressed against Then, the belt 26 is urged in the tensioning direction, and the clutch is brought into the engaged state.
[0032]
Further, the clutch roller 28 is stopped at a position where the urging force in the direction of tensioning the belt 26 by the clutch roller 28 and the reaction force from the belt 26 are balanced. When the forward rotation timer time T _ON elapses in this balanced state, the forward rotation 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. Is done.
[0033]
To release the clutch, for example, the clutch motor 32 is driven to rotate in the reverse direction based on the clutch release signal from the discharge clutch switch 56, the clutch is switched to the "disengaged" state, and the clutch arm 30 is released. The clutch motor 32 may be stopped by being detected by a detection switch or the like disposed at the original position. Further, the clutch may be set to the “disengaged” state by cutting off the power supply to 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.
[0034]
Next, in the present invention, the timer setting means 62 can set the reverse rotation timer time T _OFF for driving the clutch motor 32 in the reverse direction to relax the tension of the belt 26 based on the clutch disengagement signal. , The forward rotation timer time T _ON is set longer than the reverse rotation timer time T _OFF .
[0035]
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 T _ON based on the clutch engagement signal from the discharge clutch switch 56 as described above, and the clutch is engaged. , And the clutch engagement state is maintained. To release the clutch, the clutch motor 32 is driven in the reverse direction for the reverse rotation timer time T _OFF based on the clutch release signal from the discharge clutch switch 56, and the clutch roller 28 is disengaged from the belt 26 via the clutch arm 30. The clutch is disengaged and the clutch is in the "disengaged" state.
[0036]
FIG. 7 shows an operation timing chart in the present embodiment.
[0037]
In the figure, when the discharge clutch switch 56 is switched from OFF to ON, the drive of the clutch motor 32 starts at the rise of this signal, and the clutch motor 32 rotates in the forward direction for the forward rotation timer time T _ON and stops. At this time, the clutch motor 32 stops at a position where the urging force urging the clutch roller 28 in the direction of tensioning the belt 26 and the reaction force from the belt 26 are balanced. Before the clutch motor 32 is stopped, the belt 26 is tensioned, and the clutch is in the "on" state.
[0038]
Further, when the discharge clutch switch 56 is switched from “ON” to “OFF”, the falling of this signal causes the clutch motor 32, which has been held at the position, to start driving in the reverse rotation direction, and the reverse rotation timer time T _OFF. Just spin and stop. Immediately after the clutch motor 32 rotates in the reverse direction, the belt 26 is relaxed and the clutch is in the "disengaged" state.
[0039]
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 rotation timer time _TON has elapsed. If the normal rotation timer time _TON has not elapsed, the clutch motor 32 is driven in the forward direction in S3. If the normal rotation timer time _TON has elapsed, the driving of the clutch motor 32 is stopped in S4 ( Clutch "on" state).
[0040]
In S1, if the discharge clutch switch 56 has not been operated to "ON", the process proceeds to S5, where it is determined whether or not the discharge clutch switch 56 has been operated to "OFF". Here, if the switch 56 is _{turned off,} it is determined in S6 whether the reverse rotation timer time T _OFF has elapsed. If the reverse rotation timer time T _OFF has elapsed, the drive of the clutch motor 32 is performed in S4. To stop. If the reverse rotation timer time _TOFF has not elapsed in S6, the process proceeds to S7, in which the clutch motor 32 is driven in the reverse direction.
[0041]
In the present embodiment, the forward rotation timer time T _ON is set to approximately 4 seconds, and the reverse rotation timer time T _OFF is set to approximately 2 to 3 seconds. This is because the clutch motor 32 needs to be driven in the forward direction against the reaction force of the belt 26 in order to tension the belt 26, and thus requires a predetermined time. This is because the clutch motor 32 only needs to move in the same direction as the reaction force of the belt 26, and the time required to relax the belt 26 is shorter.
[0042]
Further, in the present invention, the spring 46 mounted between the swing gear 38 and the clutch arm 30 is fixed to one of the swing gear 38 and the clutch arm 30 and relative to either one. Attached along a movably supported axis 44.
[0043]
As described above, the shaft 44 extends from the intermediate portion in the longitudinal direction of the clutch arm 30 toward the plate 40 erected and fixed to one end of the swing gear 38, and extends along the shaft 44. The spring 46 is mounted.
[0044]
As shown in FIGS. 9 and 10, the shaft 44 has its base end side integrally fixed to the clutch arm 30, and the plate 40 has an elongated hole 40 a formed therein. The tip side of 44 is fitted. A washer 64 is inserted on the distal end side of the shaft 44, 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.
[0045]
FIG. 11 shows another embodiment of the mounting means for the spring 46. In this embodiment, two washers 64, 64 are inserted so as to sandwich the plate 40 at the tip end of the shaft 44. The outside washer 64 is prevented from coming off by the pin 66.
[0046]
Further, in the present invention, the clutch arm 30 is provided with a manual clutch lever via an accommodation mechanism.
[0047]
As shown in FIGS. 4 and 5 described above, a guide plate 68 is attached to a side wall of the grain tank 4, and a guide groove 70 is formed in the guide plate 68. A fulcrum shaft 72 is implanted from the guide plate 68, and an intermediate side of a clutch lever 74 is rotatably mounted on the fulcrum shaft 72. The operating point side of the clutch lever 74 is rotatably mounted on the clutch arm 30 via a connecting link 76 and pins 78 and 80.
[0048]
On the other hand, an oblong hole 82 is formed in the clutch arm 30, and the pin 80 is movably fitted in the oblong hole 82 in the oblong hole 82. The connecting link 76, the pin 80, and the oblong hole 82 constitute an accommodating mechanism.
[0049]
Even when the clutch lever 74 is manually operated by the interchange mechanism and the clutch is switched to the "disengaged" position in FIG. 5, the clutch clutch motor is turned on by operating the discharge clutch switch 56 independently of this manual operation. 32 can be driven to switch the clutch to the "on" position.
[0050]
【The invention's effect】
Above-described above, according to the first aspect of the invention, by driving the actuator for a predetermined time to urge the belt by a clutch roller through the elastic member in the tensioning direction, the belt in a taut and該付force Since the clutch roller is held at a position where the reaction force from the belt is balanced, an appropriate tension can be applied to the belt. Further, since the control time of driving the actuator, without the need for sensors for detecting the driving amount of the actuator, it is possible to simplify the structure.
[0052]
According to the second aspect of the present invention, since the resilient member is mounted between the oscillating body and the clutch arm and the resilient member is engaged along the support member, the resilient member allows the actuator and the belt to be connected to each other. Between the two can be reduced.
[0053]
According to the third aspect of the invention, since the clutch arm is provided with the manual clutch lever via the accommodating mechanism, the actuator can be driven independently of the operation of the manual clutch lever.
[0054]
According to the fourth aspect of the present invention, since the belt-type clutch of the present invention is applied to the clutch for controlling the paddy discharging auger of the mobile reaper, the paddy discharging auger can be easily operated.
[Brief description of the drawings]
FIG. 1 is an overall plan view of a combine to which the present invention is applied.
FIG. 2 is a front view of the belt-type clutch mechanism according to the present invention.
FIG. 3 is a plan view of a belt-type clutch mechanism.
FIG. 4 is a side view of a guide plate of the manual clutch lever.
FIG. 5 is an enlarged front view of the belt-type clutch mechanism.
FIG. 6 is a control block diagram according to the present embodiment.
FIG. 7 is a diagram showing a timing chart in the present embodiment.
FIG. 8 is a diagram showing a control flowchart in the present embodiment.
FIG. 9 is a front view of an attached state of a spring.
FIG. 10 is a plan view of a mounted state of a spring.
FIG. 11 is a front view of another embodiment of a mounted state of a spring.
[Explanation of symbols]
C Combine 5 Discharge cylinder 13 Horizontal spiral shaft 14 Belt-type clutch mechanism 20 Counter shaft pulley 24 Horizontal spiral shaft pulley 26 Power transmission belt 28 Clutch roller 30 Clutch arm 32 Clutch motor 36 Output gear 38 Oscillating gear 40 Plate 40 a Slot 44 Shaft 46 spring 48 stopper 52 return spring 56 discharge clutch switch 58 control unit 62 timer setting means 68 guide plate 72 fulcrum shaft 74 clutch lever 76 connecting link 78, 80 pin 82 oblong hole

Claims (4)

A clutch roller is disposed rotatably on a power transmission belt wound between a driving pulley and a driven pulley, and the clutch roller is moved by driving an actuator to control the tension and relaxation of the belt. In a belt type clutch mechanism that controls the on / off control of the transmission power from the driving pulley to the driven pulley,
A resilient member interposed between the actuator and the clutch roller to bias the clutch roller in a direction in which the tension of the belt is tightened;
A control unit that drives and controls the actuator based on a clutch on / off signal;
Timer setting means for setting a forward rotation timer time for driving the actuator in the forward direction based on a clutch engagement signal to tension the belt,
The clutch Nyutoki, by driving the actuator only forward timer time is urged in the direction to tension the belt through the resilient member, balances and the reaction force from the belt in a taut and該付force The actuator was stopped at the position where it was stopped to maintain the position,
A belt-type clutch mechanism, characterized in that: The bullet said actuator is a motor, which biases the clutch arm in response to displacement of the swinging motion between the clutch arm that supports the clutch roller and swinging body swings by the rotation of the motor A resilient member is interposed , and the resilient member is fixed to one of the oscillating body and the clutch arm and is engaged along a support member supported so as to be relatively movable with respect to the other.
The belt-type clutch mechanism according to claim 1, wherein: The clutch arm, provided with a manual clutch lever via an accommodation mechanism,
The belt-type clutch mechanism according to claim 1 or 2, wherein: The clutch was applied to a clutch for turning on / off power to a paddy discharging auger of a mobile reaper,
The belt-type clutch mechanism according to claim 1, 2 or 3, wherein:

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