JPS6211228Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a so-called backstop structure in a tillage shift clutch device, in which the tillage clutch is automatically disengaged when the main shift lever is set to reverse.

If the tiller is suddenly set in reverse, the handle will lift up, which is dangerous for the operator if the tiller is operating at this time. Therefore, safety standards require a backstop structure, and various backstop structures have been proposed.

This invention provides a backstop structure in which the operating lever for the tiller transmission clutch itself is disconnected when the main gear shift lever (the operating lever that controls the speed and forward/backward movement of the tiller) is set to reverse. It is.

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

FIG. 1 is a partial sectional view of the mill, and the power transmitted to the input shaft 1 is transmitted from the intermediate shaft 2 to the tillage transmission shaft 3. At this time, two ratchet wheels 4, which are constantly rotating at different rotation speeds on the tillage transmission shaft 3,
5, and a clutch 6, which can slide and engage the respective ratchet wheels 4, 5 between the ratchet wheels 4, 5;
7 is slidably and securely fitted. Therefore, by sliding the clutches 6, 7, they can be engaged with and disengaged from the ratchet wheels 4, 5, thereby making it possible to change the speed of the tillage transmission shaft 3 and to operate the clutch.

2 and 3 show the structure for sliding these clutches 6, 7, but the point is that the lever 10 is formed with shoes 8, 9 that are linked to the clutches 6, 7.
This is done by the rotational movement of 11. Lever 10,1
1, and the other ends of the wires 12, 13 are connected to engaging arms 15, 16, which are rotatable around the lever shaft 14, via semi-arculated arms 17, 18, respectively. It is something. Furthermore, since the engaging arms 15 and 16 are formed with engaging portions 15a and 16a that can be engaged with the operating lever 19, the operating lever 19 can be engaged with either of the engaging arms 15 and 16 and tilted forward. As a result, the wires 12, 13 are pulled, and the clutches 6, 7 engage with either ratchet wheel 4, 5.

4 and 5 are cross-sectional side views of the area around the operating lever 19, and FIG. 6 is a cross-sectional rear view of the area around the operating lever. The working pieces 20, 21 and the semi-arculated arms 17, 18 are pivotally connected. and,
These working pieces 20, 21 and semi-arculated arms 17, 1
8 are as shown in FIGS. 4 and 5, the operation lever 19 (engaging arms 15, 16)
When the wires 12 and 13 are pulled forward, the line of action l of the semi-arculated arms 17 and 18 crosses over the center 0 of the lever shaft 14.
Since they are beyond the so-called fulcrum, the semi-arculated arms 17, 18 will not return no matter how much the wires 12, 13 are pulled due to reaction.

Therefore, in this invention, the working pieces 20, 21
A pin 22 is provided nearby to rotate forward about the lever shaft 14 and return the operating pieces 20, 21 and the semi-arculated arms 17, 18 to their original positions. In addition, pin 2
2 is also fixed to a rotating piece 23 that can rotate around the lever shaft 14 and extends laterally to both operating pieces 20 and 21.

Next, a lever 25 is provided which rotates in a fixed direction when the main gear shift lever 24 is operated in reverse, and this lever 25 and the aforementioned rotating piece 23 are connected by a suitable connector 26 (for example, a wire). . In addition, a pin 27 is provided on the lever 25 so as to protrude from the main shift lever 2.
When the vehicle 4 is set to reverse, the lever 24 may come into contact with the pin 27 to rotate the lever 25. With constant rotation of the lever 25, the movement is transmitted to the rotating piece 23 by the connector 26, so it acts on the pin 27, and the action pieces 20, 21
Press down. Therefore, in order to make this operation smooth, a direction changer 28 may be necessary to adjust the direction of the coupling member 26 acting on the rotating piece 23.

As described above, since this device has the above-described structure and function, even if the semi-arculated arms 17 and 18 are set beyond the fulcrum, when the main shift lever 24 is operated to the reverse position, the pin 22 is activated. Then, the semi-arculated arms 17, 18 are returned to their original positions, and a backstop can be achieved.
In this way, the clutches 6 and 7 that transmit power to the tillage transmission shaft 3 are disconnected, but according to this invention, the semi-arculated arm 1 at the operating lever 19
7 and 18 are returned to their non-operating positions, the backstop is reliable. Coupled with the gentle curve of the contact surfaces of the action pieces 20 and 21 on which the pin 22 comes into contact, the cam action of both moves with a light force until it passes the fulcrum, and once it passes the fulcrum, almost no force is required. It has excellent effects such as being able to recover.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention. Fig. 1 is a cross-sectional view of a part of the mission, Figs. 2 and 3 are a plan view and a side view showing the operation of the backstop structure, and Figs. 4 and 5. The figure is a side view of the operation lever,
FIG. 6 is also a rear view. Code, 3... tillage transmission shaft, 4, 5... ratchet wheel,
6, 7...Clutch, 12, 13...Wire, 1
5, 16... Engagement arm, 17, 18... Semi-arcuous arm, 19... Operation lever, 20, 21... Action piece, 22... Pin, 24... Main gear shift lever, 2
5... Lever, 26... Connector.

Claims (1)

[Scope of utility model registration request] Ratchet wheels 4 and 5 that constantly rotate at different rotational speeds are loosely fitted on the tillage transmission shaft 3, and clutches 6 and 7 are installed between the ratchet wheels 4 and 5.
The sliding action caused by the tensile action of the wires 12 and 13 of No. 7 engages and disengages the ratchet wheels 4 and 5, and the power to the tilling transmission shaft 3 is switched on and off and the speed is changed. In the tilling gear shift clutch device, which is made possible by the movement of semi-arculated arms 17, 18, which are pivoted on actuating pieces 20, 21 formed on engagement arms 15, 16 linked to an operating lever 19, over a fulcrum, Said working piece 2
This action piece 20,2 rotates forward to around 0,21.
In addition to providing a pin 22 for returning the semi-arculated arms 17 and 18, a lever 25 is provided which rotates in a certain direction when the main shift lever 24 is operated in reverse.
2. A backstop structure for a tillage transmission clutch device, characterized in that the forward rotations of the clutches 2 and 2 are interlocked by a suitable coupling member 26.