JPH0539939Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is applicable to a mobile agricultural machine that has a main clutch lever for intermittent operation of power transmission and an auxiliary clutch lever for interrupting power transmission in an emergency. This relates to a clutch device.

BACKGROUND TECHNOLOGY Conventionally, some walking-type mobile agricultural machines have an auxiliary clutch lever that instantly cuts off the power transmission without taking your hand off the handle in case of emergency, etc., and a typical example of this is shown in Figure 5. and those shown in Figure 6.

First, two spindles 3 and 4 are fixed to a mounting plate 2 attached to a handle 1, and a main clutch lever 5 is attached to one spindle 3 so as to be rotatable around the axis of the spindle 3. A sub-clutch lever 6 is attached to the other support shaft 4 so as to be rotatable about the axis of the support shaft 4. An arm 8 is fixed to the boss portion 7 of the main clutch lever 5, and a support shaft 9 is fixed to the tip of the arm 8. And this support shaft 9
One end of a substantially U-shaped plate 10 is rotatably connected to the plate 10, and one end of a clutch wire 11 is connected to the other end of the plate 10 by a pin 12. The other end of the clutch wire 8 is connected to a tension arm (not shown), and this tension arm is connected to a V-belt (not shown) for power transmission.
A tension roller (not shown) is supported to apply tension to the.

Next, as shown in FIG. 5, when the main clutch lever 5 is rotated to the power transmission position, the auxiliary clutch lever 6, which extends toward the grip portion (not shown) of the handle 1, is rotated. Lever part 13
and the support shaft 9 are in contact with each other.

Here, when the main clutch lever 5 is rotated to the power transmission position, the clutch wire 8
The support shaft 9 is located above the straight line X that connects the support shaft 3 and the holding part 14 that holds the end of the outer wire. Therefore, the tensile force of the clutch wire 8 acts in a direction to rotate the main clutch lever 5 in the direction of arrow a, and the main clutch lever 5 is maintained at the power transmission position as shown in FIG.

Next, when operating the sub-clutch lever 6 to cut off power transmission, the sub-clutch lever 6 is rotated downward (in the direction of arrow b). Then, the support shaft 9 in contact with the lever portion 13 of the sub-clutch lever 6 is pushed downward, and the main clutch lever 5 rotates about the axis of the support shaft 3 in the direction of arrow a'. Then, when the center of the support shaft 9 moves downward from the straight line
automatically rotates to a position that cuts off power transmission.

Problems to be Solved by the Invention When it is necessary to increase the tension of the V-belt for power transmission, a large tensile force acts on the clutch wire 8, and the operating force required to rotate the main clutch lever 5 is reduced. becomes very large. In addition, as a result, the operating force required to cut off power transmission by rotating the sub-clutch lever 6 increases, making it difficult to rotate the sub-clutch lever 6 with your fingertips while gripping the grip of the handle 1. It has the disadvantage of becoming.

Means for solving the problem The main clutch lever, which connects and disconnects power transmission, is provided so as to be rotatable around the axis of the first support shaft, and the operating part extends toward the grip part of the handle and is always at a constant position. A sub-clutch lever biased to return is provided rotatably around the axis of the second support shaft, a roller-shaped rotating body rotatable around the axis is attached to the main clutch lever, and the rotation The sub-clutch lever is provided with a cam body that abuts against the outer peripheral surface of the body and rotates the main clutch lever in a direction to cut off power transmission as the sub-clutch lever is rotated.

Operation When the sub-clutch lever is rotated while the main clutch lever is rotated to the power transmission position, the cam body comes into contact with the outer peripheral surface of the rotating body, and the main clutch lever transmits power via the rotating body. The secondary clutch lever is rotated in the direction of shutoff and power transmission is shut off, but since the secondary clutch lever is always in the same position, it is easy to operate and can be operated reliably even in an emergency. In addition, since the main clutch lever is rotated via the cam body, the operating force can be reduced, and even if the operating force of the main clutch lever is strong or weak depending on the rotation position, the entire rotation range of the sub clutch lever can be adjusted. It is also possible to obtain a comfortable operating force by distributing the force proportionally.

Embodiment An embodiment of this invention will be explained based on FIGS. 1 to 4. Incidentally, the same parts as those explained in FIGS. 5 and 6 are indicated by the same reference numerals, and the description thereof will be omitted. An engine 17 is mounted on the front part of the chassis frame 16 of the mobile agricultural machine 15, and a transmission case 18 is mounted on the rear part of the chassis frame 16.
is fixed. Output pulley 20 connected to output shaft 19 of engine 17 and transmission case 1
A V-belt 23 for power transmission is wound between the input pulley 22 connected to the input shaft 21 of No. 8. One end of a tension arm 24 is rotatably connected to the outer wall surface of the transmission case 18 by a pin 25, and a tension roller 26 for applying tension to the V-belt 23 is attached to the other end of the tension arm 24. It is rotatably supported. Furthermore, the other end of the clutch wire 11 is connected to a substantially central portion of the tension arm 24.

Next, a first support shaft 27 and a second support shaft 28 having axes parallel to each other and three stopper pins 29, 30, and 31 are fixed to the mounting plate 2 attached to the handle 1 of the mobile agricultural machine 15. and the first support shaft 2
A main clutch lever 32 is attached to the main clutch lever 7 so as to be rotatable about the axis of the support shaft 27. The main clutch lever 3 is fitted onto the first support shaft 27
An arm 36 having two protrusions 34 and 35 is fixed to the boss 33 of No. 2, and one end of a substantially U-shaped plate 10 is rotatably attached to the tip of one of the protrusions 34 by a pin 37. One end of a tension wire 11 is rotatably connected to the other end of the plate 10 by a pin 12. Also,
A roller-shaped rotating body 38 is rotatably attached to the tip of the other projection 35 with an axis parallel to the axis of the first support shaft 27 .

A sub-clutch lever 39 is attached to the second support shaft 28 so as to be rotatable around the axis of the support shaft 28, and an operating portion 40 of the sub-clutch lever 39 extends toward the grip portion 41 of the handle 1. It's being served.
A substantially doglegged plate 43, which is a cam body, is fixed to the boss portion 42 of the sub-clutch lever 39, which is externally fitted on the second support shaft 28, and is opposed to the rotating body 38 on this plate 43. A contact surface 44 whose distance from the axis of the second support shaft 28 changes is formed at the position. Further, the sub-clutch lever 39 is disposed between the sub-clutch lever 39 and the stopper pin 31.
1, a torque spring 45 is attached which urges upward.

In such a configuration, first, FIG. 1 shows a state in which the main clutch lever 32 is rotated to the power transmission position, and the tension wire 11 is pulled rearward (in the direction of arrow c) and the tension is The arm 24 rotates upward, and the tension roller 20
By contacting the belt 23, tension is applied to the V-belt 23, and power is transmitted from the engine 17 to the inside of the transmission case 18.
At this time, since the pin 37 is located above the straight line X connecting the holding part 14 and the axis of the first support shaft 27, the tensile force of the tension wire 11 is applied to the main clutch lever 32 as shown in the arrow. The main clutch lever 32 is maintained at the power transmission position where it contacts the stopper pin 29.

Next, when cutting off power transmission by operating the sub-clutch lever 39, the sub-clutch lever 39
is rotated downward (in the direction of arrow b) around the axis of the second support shaft 28. When the sub-clutch lever 39 is rotated in the direction of arrow b, the contact surface 42 of the plate 41 that rotates integrally comes into contact with the outer peripheral surface of the rotating body 38. When the sub-clutch lever 39 is subsequently rotated in the direction of arrow b, the rotating body 38 receives a force in the direction of rotating the main clutch lever 32 in the power transmission cutoff direction (in the direction of arrow a') at this contact portion.
Then, the main clutch lever 32 rotates together with the arm 36 and the rotating body 38 in the direction of the arrow a', and the rotating body 38 rotates around the axis in the direction of the arrow d. When the main clutch lever 32 rotates in the direction of arrow a' and the center of the pin 37 moves below the straight line X, the tensile force of the tension wire 11 causes the main clutch lever 32 to rotate in the direction of arrow a'. The main clutch lever 32 automatically rotates to the power transmission cutoff position where it comes into contact with the stopper pin 30. As a result, the tension arm 24, which had been pulled upward via the tension wire 11, rotates downward, and the tension roller 26 separates from the V-belt 23, causing the engine 17 to move into the transmission case 18. Power transmission to is cut off.

Here, since the rotational movement of the auxiliary clutch lever 39 is transmitted to the main clutch lever 32 via the plate 43, the rotational operation angle of the auxiliary clutch lever 39 required to rotate the main clutch lever 32 by a certain angle is reduced. , is larger than the case where the main clutch lever 5 is directly rotated by the sub-clutch lever 6 as in the conventional example shown in FIG. Therefore, the auxiliary clutch lever 39 is necessary when the auxiliary clutch lever 39 interrupts power transmission.
The operating force is smaller than that of the conventional example, and even when the tension of the V-belt 23 is increased, the auxiliary clutch lever 39 can be rotated with a fingertip without removing the hand from the grip part 41 of the handle 1. Also, plate 4
Since the rotating body 38 in contact with the contact surface 44 of the clutch lever 3 moves along the contact surface 44 while rotating, there is little frictional resistance at the contact portion, and
The operating force required for the rotation operation of 9 is further reduced.

Effects of the invention As described above, this invention brings the cam body provided on the sub-clutch lever into contact with the rotating body provided on the main clutch lever, and as the sub-clutch lever is rotated, the cam body and the rotating body are brought into contact with each other. By rotating the main clutch lever in a direction that cuts off power transmission through The operating force of the sub-clutch lever can be reduced, and since the rotating body rotates at the contact area between the cam body and the rotating body and moves along the contact area of the cam body, the cam body and the rotating body rotate. Frictional resistance at the contact area with the body can be significantly reduced, so even if a large amount of force is required to operate the main clutch lever, the operation to cut off power transmission by the auxiliary clutch lever can be performed with a small amount of force. In addition, since the power transmission cutoff operation using the sub-clutch lever can be instantaneously performed without taking your hand off the grip of the handle, the stability of the work can be improved. Since it is always located at a fixed position, it has the advantage of good operability and reliable operation even in an emergency.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of this invention. Figure 1 is a side view showing the main clutch lever rotated to the power transmission position, and Figure 2 is a side view showing the main clutch lever being rotated to the power transmission position. FIG. 3 is a plan view of the main clutch lever, FIG. 4 is a side view of the entire mobile agricultural machine, and FIG. FIG. 6 is a side view showing the rotated state, and FIG. 6 is a plan view thereof. 1... Handle, 27... First support shaft, 28...
...Second support shaft, 32...Main clutch lever, 38
...Rotating body, 39... Sub-clutch lever, 40...
...Operation section, 41... Gripping section, 43... Cam body.

Claims (1)

[Scope of utility model registration request] The main clutch lever, which connects and disconnects power transmission, is rotatable around the axis of the first support shaft, and the operating section extends toward the grip of the handle and is always biased to return to a fixed position. A sub-clutch lever is provided to be rotatable around the axis of the second support shaft, and a roller-shaped rotating body that is rotatable about the axis is attached to the main clutch lever and comes into contact with the outer peripheral surface of the rotating body. A clutch device for a mobile agricultural machine, characterized in that the sub-clutch lever is provided with a cam body that rotates the main clutch lever in a direction to cut off power transmission as the sub-clutch lever is rotated.