JPS6222427Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a front power take-off device for a tractor.

Conventionally, in a front power extraction device for a tractor, the front end of a crankshaft of an engine and the rear end of a transmission shaft for front power extraction are interlocked and connected on the same axis by a spline connection. Therefore, when assembling these crankshafts and power transmission shafts, it is necessary to connect these two shafts precisely on the same axis, and the assembly work is extremely complicated. Additionally, if there is slight center runout on both shafts, the play will cause oxidative wear at the spline joint. As a result, it is necessary to disassemble the engine and repair or replace the crankshaft, which is extremely troublesome.

The present invention was devised in view of the above-mentioned problems, and its purpose is to provide a front power take-off device for a tractor that can absorb misalignment of the transmission shaft with a simple structure. do. Therefore,
The feature is that a spline is provided at the front end of the crankshaft that protrudes from the front of the engine, and a pulley is fixed to it, and a moving flange is spline-coupled to the spline in front of the pulley. The rear end flange of the transmission shaft is concentrically attached via a flexible disc, and the disc is separately fixed to the rear end flange and the moving flange with bolts at positions 90° out of phase in the circumferential direction. The bolt for fixing the moving flange jointly tightens the pulley, and the front end of the transmission shaft is also provided with a flexible joint via a flexible disc.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, reference numeral 1 denotes a tractor engine, and a front axle frame 2 is fixed to the lower part of the front end surface of the engine 1. A front axle case 3 is supported at the bottom of the front axle frame 2. engine 1
A radiator 4, battery 5, etc. are provided in front of the.

Reference numeral 6 denotes a front end portion of the crankshaft, and the front end portion 6 projects forward from the front portion of the engine 1. A pulley 7 is connected to a key 8 in the middle of the front end 6 in the front-rear direction.
It is fitted externally through. This pulley 7 is restricted from being disengaged in the axial direction by a nut 9 screwed onto the front end 6 of the crankshaft. This pulley 7 drives the cooling fan of the radiator 4.
A spline 10 is formed on the front end 6 of the crankshaft in front of the pulley 7.

A moving flange 11 is spline-coupled to the spline 10. The moving flange 11 has a boss portion 12 that fits onto the spline 10, and a flange portion 14 that fits into a recess 13 provided on the front end surface of the pulley 7.
As shown in the figure, it protrudes in the radial direction at radially symmetrical positions.

Reference numeral 15 denotes a power transmission shaft, and the front and rear ends of the power transmission shaft 15 have a front end flange 16 and a rear end flange 17 that project in the radial direction at radially symmetrical positions. Both flanges 16 and 17 are out of phase by 90 degrees. The rear end flange 17 is provided at the rear end of a boss portion 18 provided at the rear of the power transmission shaft 15 . This boss portion 18 loosely fits the boss portion 12 of the moving flange 11 .

The flange portion 14 of the moving flange 11 and the rear end flange 17 of the transmission shaft 15 are formed by the flexible disc 1
It is connected via 9. This disk 19 is made of resin, an elastic thin metal plate, or the like. flexible disc 1
9 is interposed by overlapping a plurality of sheets, and the rear end flange 1
7 and a separate bolt 20 from the moving flange portion 14,
It is concluded by 21. The rear end flange 17 and the moving flange 14 are attached with a phase shift of 90 degrees. Thus, the rear end flange 17, the flexible disc 19, and the moving flange 11 constitute a flexible joint.

The bolts 21 for fixing the moving flange portion 14 are as follows:
It jointly tightens pulley 7.

The front end flange 16 of the transmission shaft 15 also connects to the flange portion 24 of the power take-off shaft 23 via the flexible disc 22.
are connected to form a flexible joint. A front pump, an electromagnetic clutch, a front-mounted working machine, etc. (not shown) are connected to this power take-off shaft 23.

According to the above-mentioned embodiment of the present invention, the crankshaft 6 and the transmission shaft 15 are interlocked and connected by a flexible joint via the flexible disk 19, so that both the shafts 6 and 15 are provided somewhat eccentrically. However, the eccentric error is absorbed by the flexible disc 19, and since flexible joints are provided at both ends of the transmission shaft 15, the load due to the eccentric error at the connecting portion of both shafts 6 and 15 is small. Furthermore, since eccentricity errors are allowed in this way, assembly of the transmission shaft 15 becomes easy. Furthermore, since the moving flange 11 is fixed to the pulley 7, no play occurs with the crankshaft 6, and therefore no oxidative wear occurs. Since the power of the crankshaft 6 is transmitted to the moving flange 11 via the spline 10, even if the moving flange 11 is fixed to the pulley 7, the pulley 7 will not be damaged. Further, although the pulley 7 is prevented from coming off by the nut 9, it is movable rearward in the axial direction, so that even if an axial force is applied to the transmission shaft 15, it can be absorbed. Furthermore, since the bolts 21 that fix the flexible disk 19 to the moving flange 11 also tighten the pulley 7, the number of parts can be reduced.

Note that the present invention is not limited to the above embodiments.

According to the present invention, even with a simple structure, misalignment between the crankshaft and the transmission shaft can be absorbed, making assembly easy, and oxidative wear at the spline joint is prevented, resulting in many practical effects. It is something that can be demonstrated.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a front view. 1... Engine, 6... Crankshaft, 7... Pulley, 10... Spline, 11... Moving flange, 15... Transmission shaft, 16... Front end flange, 1
7... Rear end flange, 19... Flexible disc, 2
0, 21... Bolt, 22... Flexible disk.

Claims (1)

[Scope of utility model registration request] In an engine in which a spline is provided at the front end of the crankshaft protruding from the front of the engine and a pulley is fixed, a moving flange is spline-coupled to the spline in front of the pulley, and the flange is connected to the spline through a flexible disc. A rear end flange of the transmission shaft is concentrically attached, and the disc is separately fixed to the rear end flange and the moving flange with bolts at positions 90° out of phase in the circumferential direction to form a flexible joint, A front power extraction device for a tractor, characterized in that the bolt for fixing the moving flange is tightened together with the pulley, and a flexible joint is also provided at the front end of the transmission shaft via a flexible disc. Device.