JPH053380Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention [Industrial application field] This invention is a tractor for agricultural, civil engineering, or transportation purposes, in which a working machine attached to the front of the vehicle body is driven by the tractor's engine. This invention relates to a power take-off device that is provided at the front of the body frame of a tractor in order to do so.

[Conventional technology]

At least the front end of the power take-off shaft of the front power take-off device in a conventional tractor projects forward of the vehicle body frame (for example, Japanese Utility Model Application No. 57-199131). Alternatively, it is placed exposed under the vehicle body frame (for example, Japanese Utility Model Application Publication No. 143923/1983).

[Problems to be solved by the invention] As mentioned above, if the front end of the power take-off shaft protrudes from the vehicle body frame, or if the power take-off shaft is located under the vehicle body frame, the work equipment cannot be mounted on the front of the vehicle body. In other words, when the power take-off shaft is not activated, there is a risk that other objects may hit the power take-off shaft.

If another object hits the power take-off shaft, especially its front end, it will be difficult to connect the power transmission shaft when the front work machine is attached.

The object of the present invention is to provide a front power take-off device with a simple structure that can avoid contact with other objects from the outside.

B. Structure of the invention [Means for solving the problem] In the present invention, at least the front portion 2A of the longitudinally elongated beam-shaped vehicle body frame 2 of the tractor 1 is formed into a box-shaped cross section with an open front end surface. A bracket 5 is provided across the opposing inner surfaces of the box-shaped cross-sectional portion 2A of the vehicle body frame 2, and an engine 3 is mounted on the upper front part of the vehicle body frame 2, and the power is rotated by the power of the engine 3. Extraction shaft 4
is arranged in the longitudinal direction with the front end of the shaft 4 not protruding from the front end surface of the vehicle body frame 2, and the power take-off shaft 4 is supported by the bracket 5 via a bearing 6.

[Effect]

The power take-off shaft 4 is located within a box-shaped cross-sectional cavity of the front portion 2A of the vehicle body frame 2, and its front end is recessed inward from the front end surface of the vehicle body frame 2.

A power transmission shaft of a working machine mounted on the front of the vehicle body is inserted into the frame 2 through an opening on the front end face of the vehicle body frame 2 and connected to the front end of the power take-off shaft 4.

When the engine 3 rotates, the rotation is transmitted to the power output shaft 4 via the clutch, transmission mechanism, etc.

〔Example〕

The tractor 1 shown in FIGS. 1 and 2 is equipped with wheels 7 and 8 on the left and right sides of the front and rear parts of a body frame 2, and an engine 3 mounted on the front part of the frame 2 is covered with a bonnet 9. This is a passenger type vehicle with a steering wheel 10 and a driver's seat 11 provided behind the engine 3. Work equipment can be attached to the front and rear of the vehicle body. A front working machine mounting hole 12 is provided on both front side surfaces of the vehicle body frame 2, and a rear working machine coupler 13 is provided at the rear end of the vehicle body.
Further, arms 14 and 15 for raising and lowering the working machine are provided at the front and rear of the vehicle body, which are operated by hydraulic cylinders or the like.

The axle outer tube 7A of the front wheel 7 passes through the box-shaped front section 2A of the vehicle body frame 2 from side to side, and is supported by the vehicle body frame at its center. 7B is the axle outer tube 7A
The reduction cases 7C at both ends of the figure are axles protruding from the reduction case 7B, and the wheels 7 are attached to the axles 7C.

The power take-off shaft support bracket 5 of the embodiment is in the form of a pair of front and rear partition plates fixed across the inner surfaces of the left and right side walls of the vehicle body frame 2. Through the bearing tube 1
6 is attached, and the power take-off shaft 4 is supported on the central axis of the cylinder 16 via a ball bearing 6.

Pulley 17 attached to the rear end of the power take-off shaft 4
and pulley 1 attached to the front end of the output shaft of engine 3.
A belt 19 is wrapped around 8 and 8. A clutch 20 is provided between the engine 3 and the pulley 18, and the power can be connected/disconnected to the power take-off shaft 4 while the engine 3 is kept rotating.

The front working machine 21 of the embodiment is a snow blower, and the end of the connecting arm 22 at the rear of the snow blower 21 is attached to the mounting hole 12 of the vehicle body frame 2 with a horizontal pin, and the upper part of the snow blower 21 is suspended. It is connected to the arm 14 via a rod 23, and the rear end of a snow blower drive transmission shaft 24 is connected to the power take-off shaft 4.

C. Effect of the invention Since the front power take-off device of the present invention has the above configuration, the front power take-off shaft 4 is connected to the front part of the vehicle body frame 2.
A, that is, it is located in a box-shaped cross section surrounded on the top, bottom, left and right, and its front end does not protrude from the front end surface of the vehicle body frame 2. Therefore, the power take-off shaft 4 is not hit by other objects, and the transmission shaft of the working machine can be easily connected to the power take-off shaft 4 through the opening in the front end surface of the vehicle body frame 2. Furthermore, since the bracket 5 supporting the power take-off shaft 4 is provided across the opposing inner surfaces of the box-shaped section 2A of the vehicle body frame 2, it serves as a reinforcing material for the box-shaped section 2A, especially for the vehicle body. This has the effect of increasing the strength of the front part of the frame 2.

[Brief explanation of the drawing]

Figure 1 is a front view of a passenger tractor equipped with the front power take-off device of the present invention, Figure 2 is a side view of the tractor with a snow blower attached to the front, and Figure 3 is the front power take-off device of the present invention. Fig. 4 is a front view, and Fig. 4 is a longitudinal side view thereof. 1...Tractor, 2...Vehicle frame, 2A...
...Front, 3...Engine, 4...Power take-off shaft, 5
...Bracket, 6...Bearing.

Claims (1)

[Scope of utility model registration request] At least the front part of the longitudinally elongated beam-shaped vehicle body frame is formed into a box-shaped cross section with an open front end surface, and a bracket is provided between the opposing inner surfaces of the box-shaped cross-sectional portion of the vehicle body frame, and the vehicle body frame An engine is mounted on the upper front part of the vehicle, and a power take-off shaft that is rotated by the power of the engine is arranged in the front-rear direction with the front end of the shaft not protruding from the front end surface of the vehicle body frame. A front power take-off device for a tractor, which is supported by the above-mentioned bracket via a bearing.