JP2000192991A - Overheat preventive device of actuator in belt type clutch mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent overheat of an actuator by preventing output of a clutch engaging signal to the actuator when the ratio of accumulative operation time or a frequency to prescribed time in the prescribed time of the actuator exceeds a specific value. SOLUTION: An operation part 62 is arranged to arithmetically operate accumulative operation time or an accumulative operation frequency in prescribed time of a clutch motor 32 in a control part 58 enclosing a CPU on the basis of an engaging/disengaging signal of a clutch. A discharge clutch switch 23 is connected to the input side of this control part 58, and the clutch motor 32 controlled in driving via the control part 58 on the basis of a signal is connected. A calculation value at which rate the clutch motor 32 is actuated in the preset prescribed time is calculated. When a motor actuating rate exceeds a specific value, the clutch engaging/disengaging signal is not outputted to the clutch motor 32 from the control part 58 to thereby prevent overheat of an actuator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. 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 which controls on / off of transmission power from an engine via a clutch roller rotatably connected to a belt. The present invention relates to a device for preventing overheating of an actuator in a mechanism.

[0002]

2. Description of the Related Art Conventionally, in a mobile agricultural machine such as a combine machine, transmission of a driving force from an output shaft of an engine to a grain discharging portion or the like is performed, for example, via a transmission belt wound between a pulley 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.

That is, for example, a clutch operating lever provided in a driver's seat is connected via a wire to a clutch arm having a base end rotatably mounted on a shaft and a clutch roller mounted on the distal end side. A belt-type clutch mechanism that swings the clutch arm to swing the clutch arm to press or release the clutch roller on the distal end side from or to the belt and to switch the clutch on and off has been used.

[0004]

However, according to the conventional belt type clutch mechanism, when the on / off operation of the clutch is continuously performed at short time intervals, the clutch motor continues to operate substantially continuously. In this case, the circuit breaker may be activated due to overheating of the clutch motor. In this case, however, there is a possibility that the clutch operation may become impossible in an unexpected situation such as during the discharge of paddy.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to prevent overheating due to continuous driving of an actuator and prevent the clutch operation from being disabled due to the overheating. An object of the present invention is to provide an overheating prevention device for an actuator in a belt-type clutch mechanism that can be performed.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a power transmission belt (2) wound between a driving pulley (25) and a driven pulley (26).
8) A clutch roller (29) is disposed so as to be able to roll and contact with the belt, and the clutch roller (29) is moved by driving an actuator (32) to tension the belt (28).
In a belt-type clutch mechanism (24) for controlling the relaxation and controlling the transmission power of the drive pulley (25) to the driven pulley (26), the drive of the actuator (32) is controlled based on a clutch on / off signal. At the same time, a cumulative operation time or a cumulative number of operations within a predetermined time of the actuator (32) is calculated, and when a ratio of the cumulative operation time or the cumulative number of operations to the predetermined time exceeds a certain value, the actuator (32) is operated. 32) is provided with a control unit (58) for not outputting a clutch engagement signal.

According to a second aspect of the present invention, the control section (5
8) is characterized in that a clutch engagement signal to the actuator (32) can be output after a predetermined cooling period has elapsed since the output of the clutch engagement signal to the actuator (32) was prohibited.

According to a third aspect of the present invention, the control section (5
8) is characterized in that a clutch disengagement signal can be output to the actuator (32) at any time.

The invention according to claim 4 is characterized in that the belt type clutch mechanism (24) is applied to a clutch of a paddy discharging auger (15) in a mobile reaper.

[Operation] Based on the above-mentioned specific features of the invention, the belt-type clutch mechanism (24) includes the power transmission belt (2).
8) A clutch roller (29) is disposed so as to be able to roll, and the clutch roller (29) is moved by driving an actuator (32) to control the tension / relaxation of the belt (28), thereby transmitting the transmission power. The on / off control is performed, and the drive of the actuator (32) is controlled via a control unit (58) based on an on / off signal from a discharge clutch switch (23).

[0011] The actuator (32)
When the clutch engagement signal is input to the control unit (58), the drive is performed based on the clutch engagement signal. However, when the clutch engagement / disengagement signal is frequently input alternately and continuously, the actuator (32) repeats forward and reverse rotation each time. The controller (58) calculates the cumulative operation time or the cumulative number of times of operation of the actuator (32) within a predetermined time,
The ratio between the cumulative operation time or the number of cumulative operations and the predetermined time is calculated. If the ratio at this time exceeds a predetermined value, a clutch engagement signal is input to the control unit (58). Does not output the clutch engagement signal to the actuator (32),
2) Prevents overheating due to continuous driving.

The reference numerals in parentheses described above are for the purpose of comparing the drawings, and do not limit the present invention.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a combine to which the present invention is applied. A combine C is provided at a front portion of a traveling body 11 with a pre-processing section 12 which is movable vertically and horizontally with respect to the traveling body 11. have. The traveling machine body 11 is supported by a crawler traveling device (not shown), threshing the culm cut off by the pre-processing unit 12, and threshing unit 13 for selecting the threshed kernel, and temporarily separating the selected kernel. And an auger discharging device 15 for transporting the paddy in the grain tank 14 out of the machine, and the thawed straw is discharged out of the machine by the post-processing unit 16.

The auger discharging device 15 has a vertical spiral cylinder 17 and a discharging cylinder 18 each accommodating a helical shaft therein, and the grains in the grain tank 14 are stored in the grain tank 14.
Is transported to a lower portion of the vertical spiral cylinder 17 by a horizontal spiral shaft 19 provided horizontally at the bottom of the cylinder, and is discharged from the vertical spiral cylinder 17 to the discharge cylinder 1.
8 and is carried out of the machine.

A driver's seat 20 is provided on the upper part of the body, and a continuously variable transmission lever 22 for controlling the body speed is provided on a side portion of a side panel 21 of the driver's seat 20. A discharge clutch switch 23 is provided behind the switch 22 for controlling the on / off of the power from the engine to the drive mechanism of the auger discharge device 15.

When the discharge clutch switch 23 is turned on, the power from the engine is transmitted from the counter shaft pulley 25 to the horizontal spiral shaft 19 in the grain tank 4 through the horizontal spiral shaft pulley 26 by the belt type clutch mechanism 24.
The power transmission is interrupted when the power is turned off. Reference numeral 27 denotes a tank open lever for rotating the grain tank 14 to the side.

FIG. 2 shows the belt type clutch mechanism 24.
FIG. 4 is a view showing an embodiment in which the invention is applied to a clutch of an auger for discharging paddy of a combine, wherein the counter shaft pulley 25 is used.
A power transmission belt 28 is wound between the power transmission belt 28 and the horizontal spiral shaft pulley 26, and a clutch roller 29 is disposed on the power transmission belt 28 so as to be able to roll. The clutch roller 29 is supported by a distal end of a clutch arm 31 having a base end pivotally mounted on a pivot 30.

The clutch roller 29 is pressed against or separated from the belt 28 so that the belt 2
Tension / relaxation control is performed on the tension of No. 8, and the transmission power from the counter shaft pulley 25 to the horizontal spiral shaft pulley 26 is controlled on and off.

That is, the belt type clutch mechanism 24
3, a clutch motor 32 as an actuator is provided at an intermediate position between the counter shaft pulley 25 and the horizontal spiral shaft pulley 26, and the power of the clutch motor 32 is reduced by a reduction gear unit. The power is transmitted to an output gear 36 through the output gear 34. The output gear 36 meshes with a sector-shaped swing gear 38 that can swing about the pivot 30. The swing gear 38 includes a pivot 3
End surface 38 on the rotation start end side (clutch disengagement side) centered on 0
A plate 40 is integrally erected and fixed in the vicinity of a.

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 31, and the other end of the shaft 44 is formed on the plate 40. Into the elongated hole 40a. A spring (compression) 46 is mounted between the clutch arm 31 and the plate 40 along the shaft 44.

As described above, when the clutch motor 32 is driven and the output gear 36 rotates clockwise in FIG. 3, the swing gear 38 meshing with the output gear 36 rotates counterclockwise about the pivot 30 so that the swing gear 38 rotates counterclockwise. The rotational force of the dynamic gear 38 is transmitted to the clutch arm 31 via the spring 46. Thus, the clutch arm 31 rotates counterclockwise about the pivot 30, the clutch roller 29 abuts on the belt 28, and the belt 28 is tensioned to enter the clutch "on" state. Eventually, the clutch roller 29 stops at a position where the urging force in the direction of tensioning the belt 28 and the reaction force from the belt 28 are balanced, and the clutch arm 31 is locked in the clutch engaged 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 29 separates from the belt 28. The belt 28 is relaxed to be in the clutch "disengaged" 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.

Further, a spring mounting hole 50 is provided on the base end side of the clutch arm 31, and a return spring 52 is stretched between the spring mounting hole 50 and the machine body frame. Due to the urging force of the return spring 52, the clutch arm 31 moves the swing gear 3 when the clutch is disengaged.
It returns almost integrally with 8.

According to the present invention, the drive of the actuator 32 is controlled based on a clutch on / off signal, and the cumulative operation time or the number of times of operation of the actuator 32 within a predetermined time is calculated. A control unit is provided for not outputting a clutch engagement signal to the actuator 32 when the ratio between the number of times and the predetermined time exceeds a certain value.

As shown in FIG. 4, a control unit 58 having a built-in CPU includes a calculation unit 6 for calculating the cumulative operation time (or the cumulative number of operations) of the clutch motor 32 within a predetermined time.
An output clutch switch 23 for controlling the auger discharge device 15 is connected to an input side of the control unit 58, and the control unit 58 is connected to the control unit 58 based on a signal from the discharge clutch switch 23. The clutch motor 32, which is driven and controlled, is connected.

When the clutch engagement signal is transmitted from the discharge clutch switch 23, the clutch motor 32 is driven in the forward direction for a predetermined time via the control unit 58,
When the clutch roller 29 is pressed against the belt 28, the belt 28 is urged in the tensioning direction, and the clutch is engaged.

Further, the clutch roller 29 is stopped at a position where the urging force in the direction of tensioning the belt 28 by the clutch roller 29 and the reaction force from the belt 28 are balanced. When a predetermined time elapses in this balanced state, the power supply to the clutch motor 32 is cut off and the forward rotation drive is stopped.
1 is locked and held in this clutch engaged state. The lock mechanism at this time is, specifically, a worm gear fixed to the motor shaft of the clutch motor 32,
A worm wheel is meshed with the worm gear. For this reason, when the clutch motor 32 rotates, the worm wheel meshing with the worm gear rotates to rotate the output side gear. The clutch arm 3 cannot be rotated.
1 is locked.

In order to disengage the clutch,
Based on the clutch disengagement signal from the discharge clutch switch 23, the clutch motor 32 is rotationally driven in the reverse direction via the control unit 58, the clutch is switched to the "disengaged" state, and the clutch arm 31 is disposed at the original position. When the detection is performed by the detected detection switch or the like, the power supply to the clutch motor 32 is cut off and the rotation is stopped.

In the above, the calculating section 62 calculates the cumulative operation time (or the number of cumulative operations) of the clutch motor 32 within a predetermined time, and determines which clutch motor 32 A calculated value (hereinafter referred to as “motor operation ratio”) as to whether or not the motor has operated at a degree is calculated. When the motor operation ratio exceeds a certain value, the control unit 58 does not output a clutch engagement signal to the clutch motor 32.

FIG. 5 is a flow chart for calculating the motor operation ratio of the clutch motor 32.

In the figure, data (0 to n) is motor operation data, data (0) is the latest data, and data (n) is data n seconds before (oldest data). Is shown. In the calculation of the motor operation ratio, it is assumed that the calculation routine is executed once per second, and that the motor operation data is 0 when the motor is stopped and 0 when the motor is operated.
Let it be 1.

Further, if the sum of the motor operation data within a predetermined time is called a “ratio counter”, for example,
When the predetermined time is set to 6 seconds, and when the motor has not been operated in the past 6 seconds, as shown in FIG. 6A, the motor operation data is all 0, and the ratio counter = 0.
Next, when the motor operates, as shown in FIG. 6B, the data “1” is inserted at the latest position of the motor operation data, the oldest data “0” is deleted, and the ratio counter =
It becomes 1. As shown in FIG. 6C, when the oldest motor operation data is “1” and the latest motor operation data is “0”, the ratio counter changes from 3 to 2.

On the premise of these, in FIG.
Then, it is determined whether "data (n)" is 0 or 1. This "data (n)" refers to the oldest motor operation data. If “data (n)” is 0, proceed to S3,
If it is 1, in S2, a value obtained by subtracting 1 from the ratio counter is used as a new ratio counter. Next, in S3, a data shift is performed. In this data shift, the oldest data among the motor operation data is deleted, and the data is sequentially shifted.

In S4, it is determined whether or not the motor is operating. If the motor is not operating, 0 is inserted in the latest motor operation data in S5, and the process proceeds to S8. Enters 1 at the latest motor operation data in S6 and proceeds to S7. This S7
Then, a value obtained by adding 1 to the ratio counter is set as a new ratio counter. Further, in S8, the ratio counter is set to a predetermined time (n).
The value divided by is calculated as the operating ratio.

In the above description, the calculation unit 62
The case where the cumulative operation time of the clutch motor 32 within the predetermined time is calculated has been described. However, the present invention is not limited to this, and the cumulative operation number of the clutch motor 32 within the predetermined time, for example, the cumulative number of operation of the clutch arm 31 is calculated. May be. In this case, for example, the number of cumulative operations of the clutch arm 31 is counted, and when the ratio of the cumulative number of operations at this time to the predetermined time exceeds a predetermined constant value, the control unit 5
8 so as not to output the clutch engagement signal to the clutch motor 32.

Next, FIG. 7 shows a flowchart relating to the discharge clutch control.

In FIG. 5, in S11, it is determined whether or not the discharge clutch switch 23 has been switched from OFF to ON. If not, the process proceeds to S12, and if so, the process proceeds to S13. In this S13, it is determined whether the on / off flag is on or off. If the on / off flag is off, the process proceeds to S14.
Go to 5. In this S15, the on / off flag is turned off, the drive timer is set to 2.5 seconds (S16), and the process proceeds to S17.
In this S17, it is determined whether or not the drive timer is 0. If the drive timer is 0, the process returns to the first step.
At 18, the clutch motor 32 is driven in the disengagement direction.

In step S14, the operation ratio obtained by the above calculation is compared with a predetermined ratio. If the operation ratio is larger than the predetermined ratio, the process returns to the first step. If the operation ratio ≦ the predetermined ratio, S19
, The ON / OFF flag is set to ON, the drive timer is set to 2.5 seconds (S20), and the process proceeds to S21. In this S21,
It is determined whether or not the drive timer is 0. If the drive timer is 0, the process returns to the first step. If not, the clutch motor 32 is driven in the on-direction in S22. Note that S
At 12, it is determined whether the on / off flag is on or off.
The process proceeds to S17, and if it is off, the process proceeds to S17.

Next, according to the present invention, the control unit 58 transmits the clutch engagement signal to the actuator 32 after a predetermined cooling period has elapsed since the output of the clutch engagement signal to the actuator 32 was prohibited. Output is enabled.

FIG. 8 is a flowchart showing the control of the discharge clutch in this case.

In the figure, in S31, it is determined whether or not the discharge clutch switch 23 has been switched from OFF to ON. If not, the process proceeds to S32, and if so, the process proceeds to S33. In this step S33, it is determined whether the on / off flag is on or off.
Go to 5. In this step S35, after setting a predetermined time as a cooling period in the on / off flag for turning the on / off flag from off to on, the on / off flag is turned off (S36), and the drive timer is set to 2.5 seconds (S37). , S38. That is, in S35, the clutch engagement operation is disabled until a predetermined time (cooling period) elapses after the release clutch disconnection operation, thereby preventing overheating or the like due to continuous driving of the clutch motor 32. Next, in S38, it is determined whether or not the drive timer is 0 (whether the timer has expired). If the drive timer is 0, the process returns to the first step. If not, the clutch motor 32 is driven in the disengagement direction in S39. I do.

In step S34, it is determined whether or not the on / off timer is 0. If the on / off timer is not 0, the process returns to the first step. The timer is set to 2.5 seconds (S41), and the process proceeds to S42. In S42, it is determined whether or not the drive timer is 0. If the drive timer is 0, the process returns to the first step. If not, the clutch motor 32 is driven in the on-direction in S43. In S32 described above, it is determined whether the ON / OFF flag is ON or OFF. If the ON / OFF flag is ON, the process proceeds to S42, and if OFF, the process proceeds to S38.

In the above description, the disengagement operation of the clutch is invalidated until the predetermined time has elapsed after the disengagement operation of the discharge clutch. The clutch motor 32 is driven in the clutch disengagement direction via the control unit 58, and the disengagement clutch can be disengaged at any time.

[0045]

As described above, according to the first aspect of the present invention, the cumulative operation time or the cumulative number of times of operation of the actuator within a predetermined time is calculated, and the cumulative time or the cumulative number of times of operation is calculated with the predetermined time. And a control unit for not outputting a clutch engagement signal to the actuator when the ratio exceeds a predetermined value, it is possible to prevent overheating of the actuator and to operate the clutch by overheating of the actuator. Can be prevented from being disabled.

According to the second aspect of the present invention, it is possible to output a clutch engagement signal to the actuator after a predetermined cooling period has elapsed since the output of the clutch engagement signal to the actuator was inhibited. Thereby, overheating due to continuous driving of the actuator can be prevented. In addition, since the motor stop time is secured for each clutch disengagement operation, compared to a method capable of continuous drive within a short time, such as a method of measuring the drive ratio within a predetermined time,
The risk of overheating can be further reduced.

According to the third aspect of the present invention, since the clutch release signal can be output to the actuator at any time, even if the actuator may be overheated, the clutch can be forcibly released at any time. Thus, the operability can be improved.

According to the fourth aspect of the present invention, since the belt-type clutch mechanism is applied to the clutch of the auger for discharging paddy in a mobile reaper, the operation of the auger for discharging paddy can be easily performed. it can.

[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 a belt-type clutch mechanism in the combine.

FIG. 3 is an enlarged front view of the same belt-type clutch mechanism.

FIG. 4 is a control block diagram in the present embodiment.

FIG. 5 is a diagram illustrating a control flowchart relating to calculation of an operation ratio of a motor.

FIGS. 6A, 6B, and 6C are explanatory diagrams each showing a calculation method of a ratio counter.

FIG. 7 is a view showing a flowchart relating to control of a discharge clutch.

FIG. 8 is a diagram showing a flowchart relating to control of a discharge clutch performed after a predetermined cooling period has elapsed since output of a clutch engagement signal to a clutch motor is prohibited.

[Explanation of symbols]

 C Combine 14 Grain tank 15 Auger discharger 18 Discharge cylinder 23 Discharge clutch switch 24 Belt type clutch mechanism 25 Counter shaft pulley 26 Horizontal spiral shaft pulley 28 Power transmission belt 29 Clutch roller 31 Clutch arm 32 Clutch motor 58 Control unit 62 Cumulative operation Time calculation unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Kadowaki 667 Idaicho, Oji-machi, Higashi-Izumo-cho, Yatsuka-gun, Shimane 1 Inside Mitsubishi Agricultural Machinery Co., Ltd. 667 No. 1 F term in Mitsubishi Agricultural Machinery Co., Ltd. (Reference) 2B092 AA01 AB04 CA18 CA56 CA62 CC07 2B396 JA04 JC07 KE02 KE04 KE06 LE02 LE03 LP03 LP08 LP12 LP17 LR02 LR08 LR13 LR19 MA07 MC02 MC07 MC13 ME04 PA04 PA30 PA42 QA47Q03 Q RA08 RA10 RA22 RA28 3J057 AA02 BB10 GA71 GB40 HH05 JJ01

Claims (4)

[Claims] 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 reduce tension of the belt. A belt-type clutch mechanism that controls relaxation and controls on / off of transmission power from the driving pulley to a driven pulley. The belt-type clutch mechanism controls driving of the actuator based on a clutch on / off signal, and performs cumulative operation of the actuator within a predetermined time. A control unit that calculates a time or a cumulative number of times of operation and does not output a clutch engagement signal to the actuator when a ratio of the cumulative time of operation or the number of times of cumulative operation to the predetermined time exceeds a predetermined value. An apparatus for preventing overheating of an actuator in a belt-type clutch mechanism. 2. The control unit according to claim 2, wherein after a predetermined cooling period has elapsed since the output of the clutch engagement signal was prohibited to the actuator, a clutch engagement signal to the actuator can be output. An apparatus for preventing overheating of an actuator in the belt-type clutch mechanism according to claim 1. 3. The overheating prevention device for an actuator in a belt-type clutch mechanism according to claim 1, wherein the control unit is capable of outputting a clutch disengagement signal to the actuator at any time. 4. The belt-type clutch mechanism according to claim 1, 2, or 3, wherein the belt-type clutch mechanism is applied to a clutch of an auger for discharging paddy in a mobile reaper. apparatus.