JPS5836245Y2 - Operation mechanism of power take-off clutch in powered agricultural machinery - Google Patents

Description

[Detailed description of the invention] This invention enables the power take-off clutch of the power take-off shaft that rotationally drives a working machine such as a rotary connected to a power agricultural machine to be operated independently by manual operation using an operating lever. When the elevation angle of the lift arm that raises and lowers the machine exceeds a certain value, the power take-off clutch is automatically disengaged to prevent damage to the swivel transmission shaft that drives the work equipment. The purpose is to provide an interlocking operation mechanism.

Next, the configuration of this invention will be explained based on an embodiment shown in the drawings.A short arm 2 that can rotate together with a lift arm 1 has a pushing body 3 having a sliding hole 3a at its tip. 4, a rod 5 with ring grooves 5a and 5b having an arc-shaped cross section is slidably fitted into the sliding hole 3a, and a spring 7 is attached to the back surface of a ball 6 that can be fitted into the ring grooves 5a and 5b. By pressing the pushing body 3 with
The drive arm 10 of the tumbler switching mechanism 9 provided in
Between the pin 21 provided on the driven arm 11 of the tumbler switching mechanism 9 and the pin 18 of the drive arm 10, there is a tension spring extending beyond the support shaft 12 that pivotally supports these two links. 13 is tensioned and the drive arm 10 rotates between the fan-shaped notches 8a formed in the receiving plate 8, the driven arm 11 rotates beyond the support shaft 12 of the tension spring 13. Board 8
The lift arm 1 is formed so that it can rotate within another notch 8b provided in the lift arm 1, and the distance between the link grooves 5a and 5b is approximately equal to the rotation distance of the drive arm 10. If the ball 6 of the pushing body 3 fits into the ring groove 5a or 5b on the rod 5 to the left or right in FIG.
After the rod 5 is fitted into the ring groove 5a or 5b, the drive arm 10 moves against the tension spring 13 by moving the rod 5.
An elastic locking mechanism 22 is formed of a pushing body 3 having a ball 6 inside so that it can be rotated to switch between on and off over 2 seconds.

A switching arm 15 is pivotally supported on a switching operation section 14 consisting of a liquid flow switching valve that supplies pressure fluid to the operating cylinder of the power take-off clutch. If the pivotal connection is made, the drive arm 10 can be rotated between both ends of the notch 8b in the direction of arrow B in FIG.
By operating the switching arm 15, the switching arm 15 can be freely rotated to the on and off positions, respectively.

In addition, an operation plate 17 having a notch 17a slightly wider than the notch 8a is loosely fitted onto the support shaft 12, and the rod 5 and drive arm 1 are connected to each other.
Since the pin 18 to which the pin 18 is pivotally attached will be held between both edges of this notch 17a, it will be attached to the operation plate 17 and moved around the support shaft 12 using the operation lever 19, for example, along the arrow line C.
When the operating plate 17 is rotated in the direction, the pin 18 that rotates while contacting the rear edge of the notch 17a can move the drive arm 10 from the on position to the off position shown in FIG. Conversely, if the front edge of the notch 17a is brought into contact with the pin 18 and the drive arm 10 is rotated, the power take-off clutch can be switched from off to on.

Then, a set screw 20 is screwed into the operation plate 17 and attached, and a pin hole 8C into which the tip of the set screw 20 can be inserted is bored in the receiving plate 8, and the power take-off clutch is turned off as shown in FIG. When the operation plate 17 is moved to the position where , the tip of the set screw 20 can be screwed into the pin hole 8C.

Therefore, when the lift arm 1 rotates upward, the pushing body 3 slides on the rod 5 to the left in FIG. Moving.

Then, when the elevation angle of the lift arm 1 reaches a certain value, the pin 18 of the drive link 10 reaches the left edge of the notch 8a, and at this time the tension spring 13 reaches the clutch off position where the pin 21 abuts the left edge of the notch 8b. This means that the driven link 11 is switched and rotated until.

Then, if the riff l-arm 1 continues to rotate upward,
The ball 6 escapes from the ring groove 5b, and the pushing body 3 slides to the left on the rod 5 again, and in this way, the ball 6 also overcomes the ring groove 5a and moves to the left.

Therefore, when the lift arm 1 starts to descend from the upward movement position of the reference arm 1, the pushing body 3 starts to return to the right while leaving the rod 5, and when the ball 6 fits into the ring groove 5a, the pushing arm 1 starts to move downward. When the rod 5 moves to the right together with the moving body 3 and the elevation angle of the lift arm 1 reaches the same constant value as described above, the pin 18 of the drive arm 10 reaches the right edge of the notch 8a, and at this time the tension spring Reference numeral 13 switches and rotates the conventional arm 11 to the clutch-on position where the pin 21 abuts the right edge of the notch 8b.

Furthermore, if the drive arm 10 is similarly rotated within the notch 8a using the operating lever 19, the tension spring 13 can switch and rotate the driven arm 11 between clutch on and clutch off. Even if the ball 6 is in the correct position, by strongly rotating the operating lever 19, the ball 6 can be
which ring groove 5a.

5b, the drive link 10 can be switched and rotated freely.

Then, by moving the operating lever 19 to the clutch off position as shown in Fig. 1 and screwing the set screw 20 into the pin hole 8C, the operating plate 17 is fixed to the receiving plate 8, so that the lift arm 1 cannot be lowered. Even if the pusher 3 tries to pull the rod 5 to the right via the ball 6 that has initially fitted into the ring groove 5a, the rod 5 will not be able to move because the pin 18 is in contact with the right edge of the notch 17a. Therefore, the clutch-off state will be maintained, and if the operating lever 19 is used to immediately disengage the clutch and the rotation of one operating lever is fixed, the lift arm 1 The power take-off clutch can always be kept in the disengaged state regardless of the vertical movement of the motor, making the operating mechanism extremely safe even for operators who are not familiar with driving.

In this way, according to this invention, the power take-off clutch is capable of tumbler switching, regardless of whether the power take-off clutch is switched manually or automatically, and whether the switching operation is performed slowly or rapidly. As a result of the mechanism 9 always disengaging the clutch at a constant speed, incomplete operation of the clutch does not occur, and the lining does not wear out unnecessarily.

Further, since the automatic operation of the tumbler switching mechanism 9 by the lift arm 1 can always be changed by manual operation by the operating lever 19, it greatly contributes to ensuring work safety.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of this invention, FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a perspective view of the same invention. Code explanation 1... Lift arm, 2...
・Arm, 3... Pushing body, 3a... Sliding hole, 4... Pivoting, 5゜16... Rod, 5 a, 5 b ...Ring groove, 6...
... Ball, 7 ... Spring, 8 ... Reception plate, 8a, 8b, 17a ... Notch, 8C ...
...Pin hole, 9...Tumbler switching mechanism, 10
...... Drive arm, 11... Followed arm, 12... Support shaft, 13... Bow 1 tension spring,
14... Switching operation section, 15... Switching arm, 17... Operating panel, 18.21...
・Pin, 19...Operation lever, 20...
- Stopper, 22...Elastic locking mechanism.

Claims (1)

[Scope of utility model registration request] The switching operation section 14 of the power take-off clutch is provided so that it can be operated by the tumbler switching mechanism 9, and the switching operation section 14 in the clutch state can be used to disengage the clutch by upward movement of the lift arm 1 for lifting the work equipment. Switching operation section 14 in off state
The lift arm 1 is connected to the tumbler switching mechanism 9 via an elastic engagement mechanism 22 having a certain elastic engagement force so that the tumbler switching mechanism 9 can be switched to the clutch lever by the downward movement of the lift arm 1. When the operating lever 19 provided to operate the switch 9 is moved beyond the above-mentioned elastic engagement force, the elastic engagement mechanism 22 moves freely with respect to the lift arm 1, and the switching operation of the switching operation section 14 is performed. An operating mechanism for a power take-off clutch in a power agricultural machine configured to