JPS6233547Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a belt clutch that interlocks power transmission to the pre-processing section of a combine harvester in conjunction with the raising and lowering of the pre-processing section.

BACKGROUND OF THE INVENTION A meshing clutch type is known as a device that interlocks power transmission to a pre-processing section in conjunction with the elevation and descent of the pre-processing section. Also, the belt clutch shown in FIGS. 4 and 5 can be considered as a belt clutch that is cheaper than the mesh type clutch.

4, a tension pulley 14 for relaxing and tensioning the pretreatment drive belt 12 is connected to a spring 1.
A locking member 19 that is biased by 7 to constantly tension the belt 12 and fixes the tension arm 13 that supports the tension pulley 14 to the pretreatment support frame 1.
As the pre-treatment section rises, it is forcibly moved.
Relax the belt 12.

In the device shown in FIG. 5, the rotation of the tension arm 13 is restricted by a locking member 19 fixed to the support frame 1, and the tension pulley is mounted between the tension arm 13 and the tension arm fulcrum (fulcrum shaft 2). 14
The tension arm 13 is extended and connected to a part 20 of the fuselage on the opposite side through a spring 17 and a connecting arm 18, and the contracting force of the spring 17 applies a rotational force to the tension arm 13, and the rotational force causes the tension arm 13 to be extended and connected. The tension pulley 14 is urged against the pretreatment drive belt 12 to tension the belt 12. When the tension arm 13 is forcibly moved by the rise of the pre-processing part, and the locking part 31 of the tension arm 13 with the connecting arm 18 crosses the straight line passing through the part 20 of the machine body and the tension arm fulcrum 2. , the rotational force exerted on the tension arm 13 by the spring 17 is converted in the opposite direction. As a result of this conversion, the tension arm 13 rotates in a direction away from the belt 12 within the movable range of the locking member 19 of the support frame 1, and the belt 12 is loosened at once.

Problems to be Solved by the Invention The above-mentioned meshing type clutch is expensive to manufacture, and when the pretreatment section is raised midway, the meshing portion may become very small, and the meshing portion may be damaged at that time. Furthermore, repair in the event of a breakdown is also very troublesome.

In the belt clutch shown in FIG. 4, when the pretreatment section is raised a little, the pressing force on the belt 12 decreases, and the power transmission becomes extremely unstable.
In other words, the power transmission is influenced by the magnitude of the load applied to the acting portion. In addition, in the method shown in FIG. 5, the connection arm locking portion 31 is
If it approaches a straight line passing through the part 20 of the fuselage and the tension arm fulcrum 2, the rotational force by the spring 17 becomes very small, which has the disadvantage that the power transmission becomes extremely unstable, similar to the method shown in Fig. 4. Was.

Therefore, an object of the present invention is to provide a belt-type pre-processing section clutch that can clearly and reliably cut and shut off power.

Measures to solve the problem: A tension arm equipped with a tension pulley that interrupts power transmission by loosening and tensioning the drive belt of the preprocessing section is rotatably provided on the machine body, and the tension arm is moved forward. A locking member fixed to the processing unit support frame restricts rotation within a certain range, and the tension arm is provided with a sliding groove that is approximately perpendicular to the center line between the fulcrum of the arm and the tension pulley. A sliding wheel is installed in the moving groove. The wheel turning and
A spring is extended and connected directly or via a connecting arm between the fulcrum shaft and the body on the opposite side of the tension pulley.

Action When the tension arm moves away from the belt as the pre-processing section rises, and the center of the tension pulley crosses a straight line passing through the fulcrum of the tension arm and the part of the body that supports the spring, The rolling wheel moves in the arm direction in the sliding groove of the arm by the tension of the spring, urges the tension pulley to rotate in the opposite direction, and relaxes the pre-processing section drive belt all at once. Further, when the pre-processing section is lowered, it acts in the opposite direction to the above and tensions the drive belt at once.

Embodiment In the figure, 8 is a traveling device, and a threshing device 7 is mounted on the top of the traveling device 8.
A fulcrum shaft 2 is provided at the front of the. A pre-processing part support frame 1 tilted forward and downward around this fulcrum shaft 2 is rotatably provided, and a grain culm moving device 3 and a reaping device 4 are attached to the front of the support frame 1. It is made up of a processing section. A drive pulley 10, which is the starting end of the power transmission system of the preprocessing section, is attached to the ends of the two fulcrum shafts, and an input pulley 9 is attached to the drive pulley 10 and an engine (not shown) mounted on the traveling device 8. A transmission V-belt 12 is looped in a relaxed state between an intermediate pulley 11 to which power is transmitted. A tension arm 1 equipped with a tension pulley 14 at its tip that relaxes and tensions the transmission V-belt 12 that is wound in the relaxed state.
3 is provided rotatably around the fulcrum shaft 2. The rotation of the tension arm 13 is restricted by locking portions 19a and 19b at both ends of a U-shaped locking member 19 fixed to the support frame 1, and the locking member 19 is connected to the transmission V in the reaping position of the pre-processing section. The belt 12 is provided at a position where it can be tensioned. Furthermore, a ring 15 forming a sliding groove 15' perpendicular to a straight line passing through the center of the tension pulley 14 and the fulcrum shaft 2 is fixed to the middle part of the tension arm 13, and can freely slide in the sliding groove 15'. Attach the rolling wheels 16. The wheel 16 is connected via a connecting arm 18 that bypasses the fulcrum shaft 2 by a coil spring 17 pivotally supported on a part 20 of the body on the opposite side of the fulcrum shaft 2, which is the rotational fulcrum of the tension arm 13. Force the fulcrum shaft in two directions.

With the above configuration, during reaping work with the pre-processing section lowered, the tension arm 13 is moved by the locking sections 19a and 19b into a straight line (hereinafter referred to as QP) passing through the center Q of the part 20 of the machine body and the center P of the fulcrum shaft. The roller 16 in the sliding groove 15', which is located below the tension arm 13 and perpendicular to the tension arm 13, is moved toward the lower end of the sliding groove 15' by the tensile force of the coil spring 17. When the coil spring 17 stops, the tensile force of the coil spring 17 becomes a force that rotates the tension arm 13 downward, and the tension pulley 14 provided at its tip tensions the transmission V-belt 12 and power is transmitted (FIG. 2A). When the pre-processing section is raised, the support frame 1
The tension arm 13 is rotated upward by the locking part 19a fixed to the center, and when the center of the tension pulley 14 is on the QP line, the center of the part 20 of the fuselage is rotated as shown in FIG. The angle α between the line segment connecting Q and the center of the wheel 16 and the center line of the sliding groove 15' is an acute angle, and the wheel 16 moves upward on the sliding groove 15', and the tension pulley 14 is located slightly above the QP line, the coil spring 17
The tensile force causes the tension pulley 14 to rotate upward, and the tension arm 13 rotates at once until it comes into contact with the locking part 19b, as shown in FIG. and power transmission is released. When the pre-processing section is lowered, an operation completely opposite to that described above is performed.

Effects of the invention As described above, the present invention is made so that the rolling wheel 16, which is the tension fulcrum of the coil spring 17, can move on the sliding groove 15' provided at right angles to the tension arm, so that the transmission V-belt is loosened and tensioned. is converted all at once,
Transmission V-belt 1 by tensile force of coil spring 17
It is possible to greatly increase the tension on 2.

In addition, when the pre-processing section is lowered, the tension pulley 14 comes into contact with the transmission V-belt 12, so that the positional relationship is such that there is a play of l between the tension arm 13 and the locking section 19a. By doing so, the tensile force of the coil spring 17 is transmitted to the V-belt 12.
It can be effectively used to tension the transmission V-belt 12, and can also cope with some wear and tear on the transmission V-belt 12.

[Brief explanation of the drawing]

Fig. 1 is a side view of a combine pre-processing section equipped with a belt clutch device according to the present invention, Fig. 2 A to E are enlarged side views of main parts explaining the operation of the belt clutch device, and Fig. 3 is a plan view thereof. It is. Fourth
FIG. 5 shows a conventional belt clutch device. In the figure, 1... pre-processing section support frame, 2... fulcrum shaft,
5... Hydraulic cylinder, 6... Belt clutch device, 9... Input pulley, 10... Drive pulley, 1
2...Transmission belt, 13...Tension arm,
14...Tension pulley, 15...Ring, 1
5'...Sliding groove, 16...Rotary wheel, 17...Coil spring, 18...Connection arm, 19...Locking member.

Claims (1)

[Scope of utility model registration request] A preprocessing part support frame 1 is provided so as to be able to rise and fall freely around a rear end fulcrum shaft 2, and is provided between a preprocessing drive pulley 10, which is the starting end of the preprocessing part drive system, and an intermediate pulley 11 to which power is transmitted from the engine. Transmission belt 1
In the pre-processing section of the combine, the tension arm 13 that supports the tension pulley 14 is attached to one part of the machine. The tension arm 13 is provided with a fulcrum (fulcrum shaft 2) so as to be rotatable, and is restricted to rotate within a certain range by a locking member 19 provided on the support frame 1. )
A sliding groove 15' is provided which is substantially perpendicular to the center line between the tension pulley 14 and the tension pulley 14, and a slidable roller 16 is mounted in the sliding groove 15'. A combine harvester characterized in that a spring 17 is extended and connected directly or via a connecting arm 18 between the wheel 16 and the machine body on the opposite side of the tension pulley 14 across the fulcrum of the arm. Belt clutch device in pre-processing section.