JPS6112268Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for mounting a front power take-off shaft of a tractor in which a power take-off shaft for an attachment working device is provided at the front end of the tractor.

Conventionally known mounting structures for this type of front power take-off shaft include Utility Model Application No. 50-18084 (hereinafter referred to as Conventional Example 1) and Utility Model Application No. 53-
There is one disclosed in Japanese Patent No. 154526 (hereinafter referred to as Conventional Example 2), and the gist of these is as follows. That is, in Conventional Example 1, the power take-off shaft is directly connected to the engine output shaft, and the output pulley is fitted onto the power take-off shaft to be transmission connected to the working position. Therefore, since the power take-off shaft is located inside the engine room, the distance between it and the input shaft on the working equipment side becomes longer.
Belt transmission mechanisms are more advantageous in installation than transmission shafts and other devices that easily generate vibration, but in order to obtain stable transmission characteristics against load fluctuations, a tensioning device for the belt is required. It would be difficult to install the tensioning device on the power take-off shaft that is directly connected to the engine output shaft, so it may be possible to set it at an intermediate position between the power take-off shaft and the work equipment, but it is also possible to install a new mounting device such as a bracket from the vehicle body frame. The structure must be provided at the same time, which complicates the structure. On the other hand, if it is provided on the input shaft on the working device side, it must be attached to each working device, which may lead to a rise in manufacturing costs. In Conventional Example 2, the engine output shaft is transmission connected to a transmission case extending from the engine room to approximately the same height as the vehicle body frame, and the lower end output shaft of the transmission case and the power take-off shaft are transmission connected via a bevel gear mechanism. It has been done. Therefore, the position of the power take-off shaft is approximately at the same height as the vehicle body frame, and therefore the distance between the shafts and the working device becomes large, resulting in the same problem as in the case of Conventional Example 1.

This invention makes it possible to provide a front power take-off shaft that simplifies the transmission structure for the attachment work device, and prevents the problem of damage to the input transmission shaft to the transmission case caused by this with a simple structure. The purpose is to do so.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

An engine E is mounted on the front part of a traveling vehicle body having front and rear wheels 1 and 2, and a lift arm 3 and a power take-off shaft 4, which interlock and connect an attachment working device such as a tilling device to the rear part thereof, so as to be able to move up and down freely. A front power take-off shaft 5 is provided at the front for interlocking attachment working devices such as a mower, front rotary tiller, snow removal device, etc., and the engine E
The power is transmitted to the front and rear wheels 1, 2 and the rear extraction shaft 4 through a transmission M installed in a transmission case 6 that also serves as the vehicle body frame, and is transmitted to the front power extraction shaft through the transmission M and the transmission shaft 7. The tractor is configured to transmit power to the shaft 5, and an attachment working device is interlocked to the front and rear of the machine to perform various tasks such as cutting underbrush in orchards and plowing between trees. .

In order to provide the front power take-off shaft 5, the upper part of the transmission case 8 protruding from it is attached in a cantilevered manner to the front end of the front frame 9 on which the engine E is mounted, and is extended downward from the vehicle body frame. The lower end of the extension is located below the input transmission shaft 7 that bypasses the lower part of the vehicle body frame to the transmission case 8, and the transmission shaft 7 and the front power take-off shaft 5 are connected to a gear. They are linked together by transmission.

A hitch 10 for connecting an attachment work device is provided on the front surface of the transmission case 8, and is attached to the upper front end side of the front frame 9 via left and right opposing brackets 9a, 9a for hanging the work device. The arm 11 is swingably provided, and a hydraulic cylinder 12 is provided between the arm 11 and the rear portion of the transmission case 8, so that the attachment working device is interlocked and connected to the attachment so that it can be driven up and down.

Reinforcing members 13 are provided on both left and right sides of the lower end of the transmission case 8 and on both left and right sides of the front and rear intermediate portions of the transmission case 6, which also serves as the vehicle body frame, so as to improve the mounting strength of the transmission case 6. There is.

The reinforcing member 13 connects a pair of first frame portions 13a, 13a, both first frame portions 13a, 13a, which extend in the longitudinal direction of the aircraft while being located on both left and right sides of the input power transmission shaft 7, to the input power transmission shaft 7. A horizontally oriented second frame portion 13b positioned below and connected to the first frame portion 13.
It is composed of third frame portions 13c, 13c connected to the rear ends of a, 13a, and fourth frame portions 13d, 13d connected to the first and third frame portions 13a, 13c, 13a, 13c. The first and second frame portions 13a, 1
3a, 13b, . . . are configured to protect the input power transmission shaft 7 from collisions with other objects.

Further, a reinforcing member 15 having the same structure as the reinforcing member 13 is provided between the front and rear intermediate portions of the transmission case 6, which also serves as the vehicle body frame, and the axle case 14 on which the rear wheels 1 and 2 are mounted. Case 1
4, and utilizes its horizontal frame portions 15a, 15a to support a cultivator, etc.
It is configured to be able to mount and support a mid-mount type attachment work device.

In addition, the transmission case 8 protrudes from the front power take-off shaft 5.
In order to reinforce and support the input power transmission shaft 7, the reinforcing member 13 is not limited to being composed of a plurality of members as described above, but may be constructed as a whole, as long as it is provided in a state that protects the input power transmission shaft 7. , various modifications are possible.

In summary, the present invention includes a transmission case 8 that projects from the power take-off shaft 5 and is connected to the transmission case 8 so as to hang downwardly from the vehicle body frame.
The reinforcing member 13 for the lower end side of the transmission case 8
The input power transmission shaft 7 is located below the input power transmission shaft 7 and extends below the vehicle body frame.
It is characterized by extending to surround both sides and the bottom of the vehicle body.

That is, since the transmission case extends downward from the vehicle body frame, the power take-off shaft can be positioned low, and the distance between the shafts and the attachment working device located near the ground can be shortened. Therefore, since it is possible to interlock with a short transmission shaft without using a belt drive method that requires a tensioning device, stable operation is possible over a long period of time without vibration due to vibration of the transmission shaft itself. Moreover,
In order to locate the power take-off shaft below, the transmission case is suspended downward from the vehicle body frame, so the input transmission shaft to this transmission case detours below the vehicle body frame. By locating the reinforcing member that supports and reinforces the transmission case further below the input transmission shaft, collisions of the input transmission shaft 7 with other objects such as stones can be avoided as much as possible, and the mounting strength of the transmission case 8 can be improved. It has now been possible to avoid the problem of lowering the input power transmission shaft 7 and damage the input power transmission shaft 7.

[Brief explanation of the drawing]

The drawings show an embodiment of the mounting structure for the front power take-off shaft of a tractor according to the present invention, in which FIG. 1 is an overall side view of the tractor, FIG. 2 is an enlarged side view of the main parts, and FIG. 3 is FIG. FIG. 5... Power take-off shaft, 7... Input transmission shaft, 8... Transmission case, 9... Front frame, 13... Reinforcement member.

Claims (1)

[Scope of utility model registration request] This is a mounting structure for a front power take-off shaft of a tractor in which a power take-off shaft for an attachment working device is provided at the front end of the tractor, and the transmission case 8 protruding from the power take-off shaft 5 is directed downward from the vehicle body frame. In addition to hanging down, this transmission case 8
The reinforcing member 13 for the lower end side of the transmission case 8
The input power transmission shaft 7 is positioned below the input power transmission shaft 7 and extends in the direction along the input power transmission shaft 7 extending below the vehicle body frame, and in a state surrounding both sides and the lower part of the vehicle body of the input power transmission shaft 7. Mounting structure of the front power take-off shaft of the installed tractor.