JPS6141444Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an operation in which a pair of bevel gears that rotate in forward and reverse directions are provided on one rotating shaft, and the operation is performed by sliding on the rotating shaft and selectively engaging each bevel gear. This invention relates to a slide clutch type forward/reverse rotation switching device equipped with a slider.

Conventionally, this mechanism has been widely used as a mechanism that allows a single rotating shaft to rotate freely in forward and reverse directions. The operation involves engaging a shift fork with the slider, and then sliding the slider by appropriately operating the shift fork to perform forward/reverse movement or power cut-off.

In this case, the slider's stopping position on the rotation axis is the set position, where the slider slides to one side and engages with one of the bevel gears, and the neutral position, where the slider does not slide and is located in the middle. There is a position, but whatever the position, once it is stopped, that state must be maintained. Particularly in the neutral position, the power is cut off at this time and the operator's attention is distracted, so there is a risk that unintentional sliding of the slider may cause a serious accident.

However, conventional means for holding the position of the slider using a groove in the shift fork shaft, a steel ball, a spring, etc. have a drawback in that their position holding force is weak.

Therefore, the present invention provides a slider position holding mechanism that has a simple structure and can reliably hold the slider in position.

Hereinafter, one specific example of this invention will be described with reference to the drawings, in which it is applied to a left-right moving mechanism of a tillage device that is mounted on a tractor and is movable laterally.

Recently, there are devices that allow tilling equipment to automatically move left and right even during the tilling operation, in order to ensure safety and high efficiency of the tilling operation. The device that mechanically performs this left-right movement has the following general structure.

A PTO power gear box 1 is set in the center, and a gear box 2 for a left-right movement mechanism is set next to it, and outer cylinders 4, 4 forming a part of the main beam 3 extend from each. 4 is side support 5,5
The call ended without being contacted until then.

On the other hand, inner cylinders 6, 6, which also constitute a part of the main beam 3, are connected to the side supports 5, 5.
Sub-beam connectors 7, 7 fixed to outer cylinders 4, 4
It is slidably supported by.

As a result, the tilling device has a configuration in which the inner cylinders 6, 6 slide inside the outer cylinders 4, 4 and can move left and right while keeping the width constant. A telescopic transmission mechanism 10 for driving the left and right movement mechanism 9 is provided in the outer cylinders 4, 4 and the inner cylinders 6, 6, and on the other side support 5 side, a left-right movement mechanism 11 is provided inside the gear box 2 for the left-right movement mechanism and in the outer cylinder. 4, 4 and inner cylinders 6, 6, and these telescopic transmission mechanism 10 and left/right movement mechanism 11 are constructed so that their respective functions will not be hindered even if their lengths are changed. There is.

The telescopic transmission mechanism 10 has a structure in which a spline cylinder 12 provided in the inner cylinder 4 is spline-coupled with a drive shaft 13.
It is fixed. Further, the sprocket 15 is linked to a sprocket 18 fixed to the tilling shaft 9 by a chain 17 or the like.

In the left-right moving mechanism 11, a bevel gear 19 is fixed to the drive shaft 13 in the gear box 2 for the left-right moving mechanism, an idle bevel gear 20 is provided horizontally in response to this, and another bevel gear 21 is loosely fitted onto a rotation shaft 22 which is provided on an extension of the drive shaft 13 so as to be relatively rotatable.
At an intermediate position between both bevel gears 19 and 21, the rotation shaft 2
The slider 23 is spline-fitted to the bevel gears 2 and 2, and is configured to slide toward both the bevel gears 19 and 21 so as to be freely fitted therein. Further, a threaded portion 22a is formed on the end side of the rotating shaft 22, and is screwed to a female thread 24 fixed to the side support 5.

As described above, by engaging the slider 23 with either bevel gear 19 or 21, the rotation shaft 22
The tiller rotates forward or backward, and the tilling device moves left and right.

By the way, to explain this left-right moving mechanism 11 in detail, engaging portions 25, 25 are formed on both side surfaces of both bevel gears 19, 21, and correspondingly, engaging portions 26, 26 are formed on both side surfaces of the slider 23. are formed and are capable of engaging with each other. Further, a groove 27 is formed on the outer periphery of the slider 23 at the center position, and a fork 28 for sliding the slider 23 is fitted into this groove 27, and the fork 28 is linked to an operating lever 29.

On the other hand, a lock pin 31 protrudes from the idle gear shaft 30 that supports the idle bevel gear 20 toward the slider 23 by a spring 32, etc., and the tip of the lock pin 31 is configured to fit into the groove 7. take.

As described above, when the operating lever 29 is placed in the neutral position, the lock pin 31 is moved to the slider 23.
It will fit into the groove 27 of.

Therefore, the neutral position of the slider 23 is reliably maintained, and there is no chance of it operating inadvertently.

Next, when moving the tilling device left and right, operate the operating lever 29 to connect the engaging portions 26, 26 of the slider 23 and the engaging portions 2 of the bevel gears 19, 21.
5 and 25, but at this time, the tip of the lock pin 31 has a rounded slope part fitted into the groove 27, and the spring 32
Since it is installed on the idle gear shaft 20 via the holder, its movement resistance is easy and it can be retracted without interfering with this operation. Further, when the slider 23 and the bevel gears 19, 21 are engaged, they are subjected to a repulsion force that tends to separate them due to load resistance. 33, this state, ie, the set position state, is maintained against the separation force. Further, when releasing this engagement, the presence of these grooves 33, 33 does not become an obstacle, as in the case described above.

In this way, since this device has the lock pin 31 protruding from the idle gear shaft 30, which has good accuracy even when the slider 23 is in the neutral position, the error is more likely to accumulate than in the case where various position holding means are applied from the outside. There is an advantage that the neutral position of the slider 23 can be maintained more reliably because the operation is not unstable.

Further, in addition to the position holding mechanism using the lock pin 31 of the present invention, it is also possible to use a position holding means of a conventional structure, and such a configuration helps to create a position holding mechanism that is more accurate and reliable.

Furthermore, since the position holding mechanism of the present invention has a simple structure, it is inexpensive and easy to assemble, and the position holding force can be freely adjusted by adjusting the spring 32 that biases the lock pin 31. have an effect.

Note that the above is an explanation of a forward/reverse rotation switching device applied to a tillage device, but as mentioned above, this invention is not limited to these.
A pair of bevel gears 19, 21 and slider 23
This applies to forward/reverse rotation switching devices for all mechanical elements having the following.

[Brief explanation of drawings]

The figures show a specific example of applying this idea to a tillage device, of which Figure 1 is a plan view, Figure 2 is a sectional view, Figure 3 is a sectional view of the main part, and Figure 4 is an enlarged view. FIG. Code, 19...bevel gear, 20...idle gear bevel gear, 21...bevel gear, 22...
Rotation shaft, 23...Slider, 25...Bevel gear engagement part, 26...Slider engagement part, 27
... Groove, 28 ... Fork, 30 ... Idle gear shaft, 31 ... Lock pin, 32 ... Spring, 33 ... Groove.

Claims (1)

[Claims for Utility Model Registration] 1. Engaging portions 2 on the inner surfaces of the rotating shafts 22, respectively.
5 and 25 are provided, and both bevel gears 19 and 21 are meshed with an idle gear bevel gear 20 installed on an idle gear shaft 30, and both bevel gears 1
Engagement parts 26 and 26 are provided on both sides between 9 and 21, respectively.
A slider 23 having a slider 23 is slidably provided on the rotation shaft 22, and the slider 23 is slid left and right by a fork 28 fitted into a fork fitting groove of the slider 23 to engage the mutually engaging portions 25 and 26. In the forward/reverse rotation switching device that can rotate the rotation shaft 22 in the forward or reverse direction by engaging the gear, a lock pin 31 is biased to protrude from the idle gear shaft 30 via a spring 32, and at least the slider 23 is rotated in either direction. The lock pin 31 is configured to elastically fit into a groove 27 provided in the circumferential direction of the slider 23 in order to maintain the position when the lock pin 31 is in a position where it does not mesh with the bevel gears 19 and 21 of the slider 23. Forward/reverse rotation switching device. 2 The groove 27 provided in the circumferential direction of the slider 23 is
A slider position holding mechanism in a forward/reverse rotation switching device according to claim 1, which is a fork-fitting groove. 3. A groove 33 into which the lock pin 31 is fitted is formed at a location where the lock pin 31 comes into contact with the slider 23 when the slider 23 slides left and right to engage with either bevel gear 19, 21. A slider position holding mechanism in a forward/reverse rotation switching device according to claim 1 of the utility model registration, characterized in that: