JPH0414995Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to an improvement of a transmission device in a pruning machine having a forward/reverse mechanism.

(B) Prior art A conventional forward/reverse mechanism installed in the transmission path from the input shaft to the axle of this type of transmission device has a forward rotating body and a reverse rotating body loosely fitted to a switching shaft, and the rotation between the two rotating bodies is A simple claw clutch structure is constructed between the clutch body and both rotating bodies, in which the clutch body is slidably fitted onto the switching shaft of the switch, and the clutch body is selectively engaged with and disengaged from both rotating bodies via engaging/disengaging pawls. It had been.

(c) Problems to be solved by the invention Accordingly, according to such a forward/reverse mechanism using a simple pawl clutch structure, the engaging/disengaging surfaces of the engaging/disengaging pawls are approximately parallel to the sliding direction of the clutch body. In particular, the disengagement load becomes large, and in the case of recent systems in which the clutch body is switched by remote switching operation, a large actuator is required to cope with this, which causes an increase in weight.

Therefore, in order to solve this problem, the inventors created a torque spring clutch structure between the clutch body and both rotating bodies, and devised a method in which power is connected and disconnected via torque springs to reduce the engagement and disengagement load. However, when the clutch body was switched to the reverse rotation body side to lower the aircraft relative to the trunk, the problem remained that the engine brake did not work and the aircraft ran out of control.

(d) Means to solve the problem Therefore, this invention has a forward rotating body and a reverse rotating body in the transmission path inside the transmission case, which has an input shaft on the upstream side and an axle on the downstream side. A pruning machine in which a switching shaft that is loosely fitted between the two rotating bodies is mounted on a shaft, and a clutch body that is slidably fitted to the switching shaft between both rotating bodies can be selectively engaged with and detached from both rotating bodies. In the transmission device, a torque spring clutch structure is used between the forward rotating body and the clutch body, and inclined engagement and disengagement surfaces that are easily engaged and disengaged between the reverse rotation body and the clutch body are arranged in opposing shapes within a required load range. The above-mentioned problem has been solved by constructing the claw clutch structure.

(E) Effect With the above configuration, the double clutch structure allows engagement and disengagement with a small engagement and disengagement load.
Switching the clutch body away from the normal rotating body side and engaging it with the reverse rotating body side, or switching to the opposite side can be performed smoothly. Furthermore, since a predetermined pawl clutch structure is used between the reversing rotating body and the clutch body, engine braking is also effective.

(F) Embodiments Hereinafter, specific embodiments of this invention will be described with reference to the drawings.

As shown in Fig. 1, the transmission device in the pruning machine includes an output shaft (input shaft) 3 of an engine 1 on the upstream side.
In a transmission case 2 in which each axle 5 of an appropriate number of drive wheels 4 is mounted on the downstream side, a small gear for forward rotation fixed to the first shaft 7 is connected via a reduction gear group 8 of the first shaft 6 and the second shaft 7. 9 and a reversing sprocket 10, the power is transmitted from the input shaft 3 to the axle shafts 5 through the forward/reverse mechanism 11.

The forward and reverse rotation mechanism 11 includes a large forward gear (normal rotation body) 12 that is always meshed with a small gear 9 for forward rotation, and a reverse rotation sprocket (reverse rotation body) 14 that is transmitted through a chain 13 to a sprocket 10 for reverse rotation, and a transmission case. Both rotary bodies 1 are loosely fitted onto the switching shaft 15 mounted on the
A clutch body 16 is mounted on the upper side of the switching shaft 15 between 2 and 14.
are spline-fitted so that they can only slide freely, and engage the torque spring clutch structure 17 between the normal rotating body 12 and the clutch body 16, and between the reverse rotating body 14 and the clutch body 16 within the required load range. The pawl clutch structure 18 has opposing inclined engagement and disengagement surfaces 19, 19 that are easy to disengage.

The torque spring clutch structure 17 has a torque spring 2
The lower side of the clutch body 1 is fitted into the collar portion 12a of the normal rotating body 12 so as to be integrally rotatable, and the upper side is fitted onto the collar portion 12a of the normal rotating body 12.
6. The engaging/disengaging pawl 16 is loosely fitted onto the lower switching shaft 15, and the upper end thereof is bent to form the engaging/disengaging portion 20a.
By engaging and disengaging a from the engaging and disengaging portion 20a, power can be connected to and disconnected from the switching shaft 15.

The pawl clutch structure 18 includes an engaging/disengaging pawl 14a formed to protrude from the lower surface of the reversing rotary body 14, and an engaging/disengaging pawl 16b formed to protrude from the upper end surface of the clutch body 16 that engages and disengages with the engaging/disengaging pawl 14a.
As shown in Figure 2,
The opposing engagement and disengagement surfaces of both engagement and disengagement pawls 14a and 16b are formed into inclined engagement and disengagement surfaces 19 and 19 having an appropriate inclination angle Q, which facilitate engagement and disengagement within a required load range. Inclination angle Q in this case
Specifically, a servo motor for radio-controlled models (weighing around 50g) is used to create an angle that allows for engagement and disengagement. It should be noted that if the lower engaging/disengaging pawl 16a of the clutch body 16 is also provided with a similar inclined engaging/disengaging surface, the engagement/disengagement load with the engaging/disengaging portion 20a can be further reduced.

The sliding movement of the clutch body 16 in the direction of the axis of the switching shaft 15 is achieved by receiving radio waves emitted from a transmitter (not shown) by a receiver 21 on the transmission case 2 side and moving the rotation shaft 23 appropriately by a servo motor 22. Rotate forward and backward,
This is done by the switching fork 24. In this case, the forward/reverse rotation angle of the switching fork 24 is set to approximately 90 degrees so that the engaging/disengaging claw 16b of the clutch body 16 that is engaged with the engaging/disengaging claw 14a of the reversing rotor 14 does not come off naturally. .

According to the above, the power of the engine 1 is first transferred to the normal rotating body 12 side of the normal rotating body 12 and the reverse rotating body 14, which are transmitted from the input shaft 3 through the reduction gear group 8, etc., by remote switching operation. When the clutch body 16 is slid downwardly via the rotation shaft 23 etc., and the lower engaging/disengaging pawl 16a is engaged with the engaging/disengaging portion 20a of the torque spring 20 rotating together with the normal rotating body 14, Since the torque spring 20 is quickly wound up, the normal rotating body 1 is rotated through the torque spring 20.
2 and the switching shaft 15 are integrated. As a result, the normal rotation of the normal rotating body 12 is transmitted to the switching shaft 15,
The drive wheels 4 are driven in normal rotation via the axles 5.

Next, the drive wheels 4, which have been driven in the forward direction, are switched to the reverse drive by sliding the clutch body 16 upward by a remote switching operation. That is, first, the engaging/disengaging portion 2 of the torque spring 20
The engagement/disengagement pawl 16a below the clutch body 16 is easily disengaged from the clutch body 16. As a result, the torque spring 20 that had been wound up quickly returns to its original state due to its restoring force and loosely fits into the switching shaft 15, and power transmission to the switching shaft 15 is released. After this separation is performed, the upper engaging/disengaging pawl 16b of the clutch body 16 is connected to the reversing rotating body 14.
At the same time, the reverse rotation of the reversing rotating body 14 is transmitted to the switching shaft 15 via the clutch body 16, and the driving wheels 4 are switched to reverse driving via the axles 5. . Thereafter, similarly, the drive wheels 4 are switched to drive in the desired forward or reverse direction via the forward/reverse mechanism 11.

Note that when the drive wheels 4 are driven in the forward direction, the pruning machine attached to the trunk of the tree rises relative to the trunk, and when the drive wheels 4 are driven in the reverse direction, they descend.

(g) Effects of the invention This invention, which has the above-mentioned configuration, is capable of connecting the forward rotating body 12, the clutch body 16, and the reverse rotating body 14 of the forward/reverse mechanism 11 provided in the power transmission path from the input shaft 3 to the axle 5. Between the clutch body 16 and the clutch body 16, there is provided a torque spring clutch structure 17 with a smaller engagement/disengagement load than a conventional simple claw clutch structure, and inclined engagement/disengagement surfaces 19, 19.
Since the claw clutch structure 18 has a claw clutch structure 18 having The forward and reverse switching can be performed smoothly with a smaller load than usual, and this forward/reverse switching can be performed using a small actuator, such as a servo motor for a radio-controlled model, which is fully compatible with remote switching operation methods and is lightweight.

Furthermore, if a torque spring clutch structure 17 is also adopted between the reverse rotation body 14 and the clutch body 16,
There was a problem that the engine brake did not work when the aircraft was descending, causing the aircraft to run out of control, but since this gap is provided with a predetermined pawl clutch structure 18, this problem has been eliminated.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of the transmission device of a pruning machine implementing this invention, and Figure 2 is an explanatory diagram of the engagement and disengagement pawl of the pawl clutch structure applied to the forward/reverse mechanism provided in the transmission device. be. Code, 2...Transmission case, 3...Input shaft, 5...
...Axle, 12...Normal rotating body, 14...Reverse rotating body, 15...Switching shaft, 16...Clutch body, 17
... Torque spring clutch structure, 18 ... Pawl clutch structure, 19, 19 ... Inclined engagement and release surface.

Claims (1)

[Scope of utility model registration request] A switching shaft 15 into which a normal rotating body 12 and a reverse rotating body 14 are loosely fitted is provided in a transmission path in a transmission case 2 which has an input shaft 3 on the upstream side and an axle 5 on the downstream side. Transmission in a pruning machine in which a clutch body 16 which is mounted on a shaft and is slidably fitted onto a switching shaft 15 between both rotating bodies 12 and 14 can be selectively engaged with and detached from both rotating bodies 12 and 14. In the apparatus, a torque spring clutch structure 17 is provided between the normal rotating body 12 and the clutch body 16, and a torque spring clutch structure 17 is provided between the normal rotating body 12 and the clutch body 16, and a reverse rotating body 14 is provided.
A transmission device for a pruning machine, characterized in that a claw clutch structure 18 has opposing inclined engagement and disengagement surfaces 19, 19 that are easily engaged and disengaged within a required load range between the clutch body 16 and the clutch body 16.