JPH0234512Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a switching device for a power take-off shaft provided in a working traveling machine such as an agricultural tractor.

[Prior Art and Problems to be Solved by the Present Invention] Generally, in this type of work traveling machine, in addition to the rear power take-off shaft that protrudes from the transmission toward the rear of the machine, there is a shaft located on the belly side of the machine. There is one in which a protruding abdominal power take-off shaft and two protruding power take-off shafts are provided. However, in the past, the transmission switching to both power output shafts was done separately using separate operating levers, which made it easy to operate the operating levers incorrectly, resulting in many malfunctions. If the operating lever for the rear power take-off shaft is accidentally switched to the operating side when the shaft is in use, power will also be transmitted to the rear power take-off shaft, and in this case, the working parts are not connected at all. The naked rear power take-off shaft will rotate, which is extremely dangerous.
This has caused problems, such as the need to cover the power take-off shaft on the side that is not in use with a member such as a cap.

[Means for solving the problems] The present invention was devised in order to eliminate these drawbacks in view of the above-mentioned actual situation, and has two power take-off shafts protruding from the transmission. However, when one power take-off shaft is in use, power is never transmitted to the other power take-off shaft, which significantly improves safety. A switching device for power take-off shafts that can switch transmission to two power take-off shafts by operating a single operating lever, which not only eliminates erroneous operation, but also simplifies the structure. It is intended to provide.

In order to solve the above-mentioned problems, the present invention has a configuration in which a transmission gear that is movable in the axial direction is provided on one of the two power take-off shafts that protrude from the tranramition, and an axial A gear group consisting of a floating gear that moves integrally in the core direction but is free to rotate around the axis is pivotally supported, and the transmission gear meshes with one gear on the input shaft side of the gear group. Interlocked with the operating lever to switch between the meshing position where the gear rotates with one power take-off shaft and the meshing position where the floating gear meshes with the other gear on the input shaft side and transmits power to the other power take-off shaft. It is characterized by the fact that it has been forced.

[Operations and Effects of the Present Invention] According to the configuration of the present invention described above, although the two power take-off shafts are made to protrude from the transmission, transmission switching to each power take-off shaft is performed by a single operation. This is done by a simple one-touch lever switching operation, so unlike the conventional case where separate operating levers are provided, there is no chance of erroneous operation, and while one power output shaft is in use, the other power There is no inconvenience that the take-out shaft may operate inadvertently. Moreover, when the gear group is moved to the other meshing position by the switching operation of the operating lever, the idle gear rotates freely relative to the transmission gear and power is transmitted to the other power output shaft. Therefore, the transmission gear side does not rotate at all, and there is no inconvenience that both power take-off shafts rotate at the same time. This is something that can be simplified.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

In the drawings, reference numeral 1 denotes a running body of an agricultural tractor, which is an example of a running body for work. The power is transmitted to an input shaft 7 which is pivotally supported by a transmission 6. 8 is a differential mechanism, and 9 is a rear wheel.

Reference numeral 10 denotes a rear power take-off shaft protruding rearward from the transmission 6, which is similar to the rear power take-off shaft 1.
0, a boss portion 11 is fitted with a spline so as to be slidable in the axial direction. Furthermore, this boss portion 11
A transmission gear 12 is spline-fitted to the outer periphery of the gear, and an idler gear 14 is rotatably supported around an axis via a needle bearing 13, forming the gear group of the present invention. There is.
Reference numeral 15 denotes a retaining ring that restricts movement of both gears 12 and 14 in the axial direction with respect to the boss portion 11. A shifter groove 16 is formed between the transmission gear 12 and the floating gear 14 by a flange portion 12a projecting from the side surface of the transmission gear 12 on the floating gear 14 side.
A shifter 18 is engaged with the shifter groove 16 and is operatively connected to an operating lever 17, which will be described later.
On the other hand, 19 is the traveling aircraft 1 from the mission case 6.
The abdominal power take-off shaft 19 is an abdominal power take-off shaft that protrudes toward the abdomen side of the abdominal power take-off shaft 1.
Gear 19a spline-fitted to 9, fixed shaft 2
A gear 2 is rotatably supported on the 0 via a bearing 21.
0a, it is interlocked and connected to a gear 22a rotatably supported on a fixed shaft 22 via a bearing 21. When the operating lever 17 is operated from the neutral position N in the direction of arrow B as shown in FIG. 3 to rotate the shifter 18 toward the rear, the transmission gear 12 meshes with the gear 7b of the input shaft 7. This allows power to be transmitted from the input shaft 7 to the rear power take-off shaft 10 via the transmission gear 12. Conversely, when operating the operating lever 17 from the neutral position N in the direction of arrow A, the idler gear 14
is meshed with the gear 7a of the input shaft 7 and the gear 22a interlocked with the abdominal power extraction shaft 19, thereby transmitting power from the input shaft 7 to the abdominal power extraction shaft 19 via the floating gear 14. It's starting to feel like I'm being forced to do it. At this time, as shown in FIG. 3, at the neutral position N of the operation lever 17, the idle gear 14 is larger than the gap X between the idle gear 14 and the gear 7a on the input shaft side.
The gap Y between and the gear 22a is larger (X<Y)
Therefore, when the operating lever 17 is operated to the A side, the floating gear 14 first meshes with the input shaft side gear 7a and then meshes with the gear 22a.

Reference numeral 23 denotes a brake body made of a rubber elastic material that is fitted onto the outer periphery of the flange portion 12a of the transmission gear 12, and the brake body 23 has the operation lever 17 connected to the rear power take-off shaft 10 as shown in FIG. When operated to the transmission side to Shifter 1 rotated downward when
8, thereby braking the rotation of the rear power take-off shaft 10 side.

In the embodiment of the present invention configured as described above,
When using the rear power take-off shaft 10, if the operating lever 17 is operated in the direction of arrow B as described above, the transmission gear 12 meshes with the input shaft gear 7b, thereby generating the rear power output. When the extraction shaft 10 is driven and the abdominal power extraction shaft 19 is used, operating the operating lever 17 in the direction of arrow A moves the floating gear 14 to the input shaft side gear 7a and the abdominal power extraction shaft 19 side. This meshes with the gear 22a, thereby driving the abdominal power extraction shaft 19.

In this way, in the present invention, the rear power take-off shaft 1
It is possible to perform the desired work by extracting power from both the power take-off shafts, 0 and abdominal power take-off shaft 19, but the selection of the power take-off shaft to be used is made using the arrow A on the single operating lever 17. Alternatively, it can be freely performed by operating in the B direction. Therefore, unlike the conventional case in which operating levers are provided separately, there is no possibility of accidentally operating the operating lever on the side that is not used. Moreover, since the transmission gear 12 and the idler gear 14 are structured to rotate freely relative to each other, when one power take-off shaft 10 or 19 is rotating, the other power take-off shaft 19 or 10 is rotating. The operation lever does not move at all, and inadvertent rotation of the power take-off shaft 10 or 19 on the side that is not in use is completely eliminated, making it extremely safe. Since only one is needed, the structure can also be simplified.

In addition, in this embodiment, the abdominal power take-off shaft 19
, the floating gear 14 must mesh with both gears 7a and 22a by operating the operating lever 17. After the gear 7a on the side with the narrower gap X with the floating gear 14 is engaged and rotated, it will mesh with the gear 22a on the side with the wider gap Y, so that the opposing teeth of each gear are rotated. Even if they collide with each other and cannot be engaged, smooth engagement can be achieved. Furthermore, the abdominal power take-off shaft 19
When the shifter 18 presses the brake body 23 to apply a brake to the rotation of the transmission gear 12, the transmission gear 12 rotates with the rotation of the idler gear 14, and the rear This is extremely convenient since there is no inconvenience such as rotation of the power take-off shaft 10.

[Brief explanation of the drawing]

The drawings show an embodiment of the power take-off shaft switching device according to the present invention, in which Fig. 1 is a side view of an agricultural tractor, Fig. 2 is a power transmission system diagram, and Fig. 3 is a power transmission system diagram.
The figure is a sectional view of the main part of the transmission case, Fig. 4 is an exploded perspective view of the operating lever, Fig. 5 is a sectional view of the main part showing the abdominal power take-off shaft in use, and Fig. 6 shows the rear power take-off shaft in use. FIG. In the figure, 6 is a transmission case, 7 is an input shaft, 10 is a rear power take-off shaft, 12 is a transmission gear,
14 is a floating gear, and 19 is an abdominal power take-off shaft.

Claims (1)

[Scope of utility model registration request] A transmission gear that can freely move in the axial direction is attached to one of the two power take-off shafts that protrude from the tranramition.
A gear group consisting of a floating gear that moves integrally in the axial direction with respect to the transmission gear but is free to rotate around the axis is pivotally supported, and the transmission gear is attached to the input shaft side of the gear group. Switching between a meshing position where the gear meshes with one gear and rotates with one power take-off shaft, and a mesh position where the floating gear meshes with the other gear on the input shaft side and transmits power to the other power take-off shaft. A switching device for a power take-off shaft, characterized in that it is interlocked and connected to an operating lever.