JP2000266077A - Tension clutch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tension clutch capable of assembling a clutch arm and an oscillator oscillating the clutch arm. SOLUTION: This tension clutch device, controlling the tension and release of a belt 8 wound around between a driving shaft and a driven shaft and switching input/output of driving force to/from the driven shaft side, is provided with a rotational fulcrum boss 11a of a clutch arm 11 rotatably-supporting a clutch roller 9 tensing or releasing belt tension, and a rotational fulcrum boss 14a of an oscillator 14 oscillating the clutch arm 11 through a linking part 20 overlapped with each other in a concentric circle form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension clutch device which is turned on and off by an actuator such as a motor.

[0002]

2. Description of the Related Art Conventionally, there is provided a power transmission belt wound between a drive shaft and a driven shaft, and a clutch arm rotatably supporting a clutch roller rotatable with the belt.
The clutch arm is swingably supported so as to control the tension and relaxation of the belt tension caused by the rolling contact of the clutch roller with the belt to switch the on / off of the driving force to the driven shaft side. An oscillating body for oscillating the clutch arm, the oscillating body pivotally supported to oscillate the clutch arm, an actuator for oscillating the oscillating body, and an 2. Description of the Related Art There is known a tension clutch device including an interlocking member disposed between an oscillating body and a clutch arm so as to transmit the oscillating operation of the moving body to a clutch arm.

[0003]

In the above-mentioned tension clutch device, the oscillating body and the oscillating center of the clutch arm are set to be the same. Normally, each boss of the clutch arm and the oscillating body is externally fitted to the same fulcrum shaft. It is slidably supported on the same fulcrum shaft, but in this case, it is difficult to assemble the clutch arm and the oscillating body, and it is not easy to disassemble and assemble the tension clutch device. Since it is necessary to match the dimensional accuracy of the boss of the clutch arm and the boss of the oscillating body, there is a problem that the management of the dimensions is not easy.

[0004]

According to the present invention, there is provided a tension clutch device comprising: a power transmission belt wound around a drive shaft and a driven shaft; A clutch arm 11 rotatably supporting a contactable clutch roller 9, and controlling the tension and relaxation of the belt tension caused by the rolling contact of the clutch roller 9 with the belt 8 to drive the driven shaft. The clutch arm 11 is swingably supported so as to switch on / off of the
An oscillating body 14 for oscillating the clutch arm 11 is pivotally supported concentrically with the clutch arm 11 so as to be swingable.
Interlocking part 2 for transmitting the swinging motion of clutch 4 to clutch arm 11
0 is disposed between the rocking body 14 and the clutch arm 11, the rotation fulcrum boss 11 of the clutch arm 11
The first feature is that a is overlapped on a concentric circle with the pivot boss 14a of the rocking body 14.

Further, the interlocking section 20 has a connecting rod 19 in the form of a rod. One end of the connecting rod 19 is fixed to one of the clutch arm 11 and the rocking body 14, and the other end of the connecting rod 19 is fixed to the other side. The second feature is that the end side is slidably supported, and a stopper 22 from the clutch arm 11 or the rocking body 14 side is provided at the end of the connecting rod 19 on the slide side.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a main part of a discharge spiral 1 for discharging grains in a Glen tank portion of a combine, on a driving end side. The driving force of the discharge spiral 1 is cut off via a tension clutch device 2 shown in FIG. It is structured to be freely transmitted. By transmitting the driving force to the discharge spiral 1, the grains can be discharged from the inside of the Glen tank via the discharge spiral 1.

That is, the discharge spiral 1 has a structure in which a spiral strip 1b is integrally attached to the outer periphery of a rotary shaft 1a in the front-rear direction as in the prior art.
a tension pulley 5 of the present invention is attached to a drive pulley (not shown) of a drive shaft, to which a driven pulley 5 is attached, and the driven pulley 5 is transmitted with a rotational driving force from the engine side of the combine. The driving force is transmitted to the discharge spiral 1 via the tension clutch device 2 so as to be freely turned on and off.

The Glen tank of this embodiment is configured to be openable and closable, and operates a handle 6 attached to one end of an arm 4 pivotally supported by a support shaft 3.
The end of the arm 4 on the handle 6 side is swung upward,
By contacting the roller 7 provided on the other end side of the arm 4 with the machine frame side of the combine, the Glen tank can be easily rotated.

On the other hand, the tension clutch device 2 is supported by a plate-shaped frame 10 as shown in FIGS. 2 and 3, and is wound between a driving pulley (not shown) and a driven pulley 5. Belt 8 for power transmission being rotated
A clutch arm 11 rotatably supporting a clutch roller 9 rotatable on the belt 8 and pivotally supported vertically, and a swing mechanism 12 for vertically swinging the clutch arm 11. ing.

The clutch arm 11 has a boss 1 at one end.
A boss 11a is rotatably fitted on a fulcrum shaft 13 protruding from the frame 10 and is supported by the fulcrum shaft 13 so as to be swingable.
The clutch roller 9 is rotatably supported on the other end (free end) of the clutch arm 11.

Then, the clutch arm 11 is swung up and down, and when the tension of the belt 8 exceeds a predetermined value by the clutch roller 9, power transmission from the driving pulley to the driven pulley 5 is performed (the tension clutch device 2 is turned on). In this embodiment, the clutch arm 9 is swung upward to rotate the clutch roller 9 against the belt 8 from below, thereby tensioning (raising) the belt 8. It is configured. The clutch arm 11 is urged downward (in a direction of relaxing the tension of the belt 8) by a return spring (not shown).

On the other hand, the oscillating mechanism 12 meshes with the fan-shaped oscillating gear 14, which is an oscillating body whose boss 14 a is rotatably fitted to the boss 11 a of the clutch arm 11. A motor 17 which is an actuator having a pinion gear 16 mounted on the rotating shaft side,
4 and a receiving gear 18 fixed to the
Interlocking unit 20 that transmits the swinging motion of
And so on.

That is, the swing gear 14 is connected to the fulcrum shaft 13 described above.
The swing fulcrum (boss 11a) of the clutch arm 11 and the swing fulcrum (boss 14a) of the swing gear 14 are concentrically overlapped with each other via a boss 11a of the clutch arm 11. ing. At this time, the interlocking portion 20 has one end side welded to the clutch arm 11 side and the other end side slidably (removably) inserted into the receiver 18.
9 and a spring 21 which is a resilient member which is fitted to the connecting rod 19 and is interposed between the receiver 18 and the clutch arm 11.

A hollow pin 22 is inserted into the end of the connecting rod 19 inserted into the receiver 18 to prevent the connecting rod 19 from coming off from the receiver 18. As shown in FIG. 4, a ring-shaped wire 23 is attached via a hollow portion, and when the connecting rod 19 is removed from the receiving 18, even if the pin 22 is removed from the connecting rod 19, the connecting rod 19 and the pin 22 are connected. It is configured not to separate. Thus, inconveniences such as loss of the pin 22 of the connecting rod 19 during disassembly and assembly of the tension clutch device 2 do not occur.

A state in which the clutch roller 9 is in rolling contact with the belt 8 but the tension of the belt 8 is less than the above-mentioned predetermined value and power is not transmitted from the driving pulley to the driven pulley 5 (tension clutch device) 2), the motor 17 is driven, and the pinion gear 16 is rotated by the driving of the motor 17 to swing the swing gear 14 upward. Rocked.

In this case, since the tension of the belt 8 caused by the contact of the clutch roller 9 with the belt 8 and the urging force of the above-mentioned return spring are applied to the clutch arm 11 on the lower side, the urging force is balanced. A biasing force corresponding to the difference between the swing angles of the clutch arm 11 and the swing gear 14 (the amount of compression of the spring 21) is applied to the upper side from the spring 21, and the two biasing forces are balanced to move the clutch arm 11 upward. Swing is performed.

By controlling the motor 17 to drive the motor 17 for a time necessary for the tension clutch device 2 to enter and operate, the belt 8 transmits power to the driven pulley 14 from the driving pulley to the constant pulley. Is constantly applied, power is transmitted from the driving pulley to the driven pulley 14, and the discharge spiral 1 is rotationally driven.

The switching of the tension clutch device 2 from the engaged operation state to the disengagement operation state is performed by driving the motor 17 so as to swing the swing gear 14 downward, and returning the clutch arm 11 by the urging force of the return spring or the like. This is performed by swinging downward to relax the tension of the belt 8. The motor 17 is driven such that the rotation speed (drive amount) and the drive time of the motor 17 are controlled so that the tension clutch device 2 is disengaged. Is performed.

The above-described support shaft 3 functions as a stopper on the lower limit side of the swinging gear 14, that is, the swinging gear 14 swings downward (in a direction in which the tension clutch device 2 is turned off). In this case, as shown in FIG. 5, the swing gear 14 contacts the support shaft 3 and the motor 17
Is stopped by the drive time or the like, and the swing gear 1
The swing of 4 stops.

On the other hand, at both ends of the swing gear 14, the gear tooth profile is changed, thereby setting the upper limit of the swing. That is, as shown in FIG.
6 does not mesh with the deformed tooth profile of the swing gear 14,
The swing of the swing gear 14 is stopped. As a result, overrun of the swing gear 14 in the vertical swing can be prevented, and the stopper of the swing gear 14 can be set without providing a dedicated member or the like, which simplifies the structure and is advantageous in terms of cost ( Inexpensive).

A substantially cylindrical guide 24 is interposed between the frame 10 and the swing gear 14.
4 is in contact with the frame 10 side surface of the swing gear 14 and the frame 10. As a result, the swing gear 14 is smoothly swung through the guide 24 with respect to the frame 10 via a predetermined gap, thereby preventing the swing gear 14 from falling down during operation or the like.

With the above structure, before assembling the tension clutch device 2 or during maintenance, the boss 11a of the swing gear 14 is previously attached to the boss 11a of the clutch arm 11.
a, the spring 21 is externally fitted to the connecting rod 19, the connecting rod 19 is inserted into the receiving 18, and the retaining pin 22 is attached, so that the clutch arm 11 and the swing gear 14 are integrally formed. Into an assembly.

As a result, the clutch arm 11 and the oscillating gear 14 can be handled as one assembly, and the disassembly and assembly (maintenance) of the tension clutch device 2 can be performed, so that the assemblability and maintenance of the tension clutch device 2 are improved. In addition, disassembly and assembly becomes easy. In particular, since the connecting rod 19 does not come off from the receiving member 18, the connecting rod 19 and the receiving member 18 are separated, and the clutch arm 11 moves up alone with respect to the swing gear 14 (the clutch arm 11 and the swing gear 14 Inconveniences such as separation) are prevented, and handling of the assembly becomes easier.

Further, the above assembly allows a larger fitting portion between the clutch arm 11 and the oscillating gear 14 on the fulcrum shaft 13 side, thereby facilitating the assembling and improving the rigidity of the oscillating portion. Further, assembling errors and errors of each part are also reduced.

[0025]

According to the structure of the present invention constructed as described above, the pivot boss of the clutch arm and the pivot boss of the rocking body are concentrically overlapped with each other. By fitting the rotating boss of the moving body to either one, the clutch arm and the oscillating body can be integrated and handled as an assembly, so that the tension clutch can be disassembled and assembled (maintenance). There is an advantage that the assemblability of the clutch device is improved and the disassembly and assembly is facilitated.

In particular, by connecting the clutch arm and the oscillating body with the connecting rod and preventing the connecting rod from coming off from the clutch arm or the oscillating body by the preventing portion, the clutch arm and the oscillating gear can be separated. There is also an effect that inconvenience is prevented and handling of the assembly becomes easier.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an end portion of a discharge spiral.

FIG. 2 is a front view of a main part of the tension clutch device.

FIG. 3 is a plan view of a main part of the tension clutch device.

FIG. 4 is a sectional view of a main part of an end portion of a connecting rod.

FIG. 5 is a front view showing a swing lower limit state of the swing gear.

FIG. 6 is a front view showing a swing upper limit state of the swing gear.

[Explanation of symbols]

 8 Belt 9 Clutch Roller 11 Clutch Arm 11a Boss of Clutch Arm (Rotation Support Boss) 14 Oscillator 14a Boss of Swing Gear (Rotation Support Boss) 19 Connecting Rod 20 Interlocking Portion 22 Pin (Retaining Portion)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toru Itamochi 667, Iya-cho, Oizumi-cho, Higashi-Izumo-cho, Yatsuka-gun, Shimane 1 F term in Mitsubishi Agricultural Machinery Co., Ltd. (reference) 3J056 AA42 AA62 BA04 CC07 CC41 GA02 GA26

Claims (2)

[Claims] A clutch for rotatably supporting a power transmission belt (8) wound between a drive shaft and a driven shaft and a clutch roller (9) rotatable on the belt (8). An arm (11) for controlling the tension and relaxation of the belt tension caused by the rolling contact of the clutch roller (9) with the belt (8) to switch on / off of the driving force to the driven shaft side. The clutch arm (11) is swingably supported, and a swing body (14) for swinging the clutch arm (11) is swingably supported concentrically with the clutch arm (11). ) In which an interlocking portion (20) for transmitting the swinging operation of the clutch arm (11) to the clutch arm (11) is arranged between the swinging body (14) and the clutch arm (11). (11a)
A tension clutch device in which a rotary boss (14a) of a rocking body (14) is overlapped on a concentric circle. 2. The connecting rod (19), wherein the interlocking part (20) has a rod shape.
And one end of the connecting rod (19) is fixed to one of the clutch arm (11) and the rocking body (14), and the other end of the connecting rod (19) is slidable on the other side. The tension clutch device according to claim 1, further comprising a support portion and a retaining portion (22) provided at a slide-side end of the connecting rod (19) from the clutch arm (11) or the rocking body (14).