JPS6218747Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torque limiter device, particularly to a torque limiter device interposed in a pre-processing section transmission line in a combine harvester.

Conventionally, shear pins have been used as overload prevention devices for combine harvesters, but once they break, it is troublesome to replace them, leading to a decline in work efficiency. Further, when a torque limiter is used as an overload prevention device, the pawl repeatedly engages and disengages when the torque limiter is activated, making noise and premature wear, making it impractical for practical use.

Therefore, the present invention maintains the movable clutch in an approximately disengaged state when an overload occurs.
In addition to preventing the generation of noise and wear, it also prevents accidents from occurring due to sudden activation of equipment when removing the cause of overload, etc.
Furthermore, in the approximately disengaged state of the movable clutch,
It is an object of the present invention to provide a torque limiter device that can prevent the continuation of work in a non-transmission state by holding so that only the smooth surfaces of the tips of the claws are connected and emitting a warning with a sliding sound. .

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

As shown in FIG. 1, the combine 1 has a main machine 3 supported by a crawler 2.
An automatic threshing machine 5 is mounted on the machine 3, and a driver's seat 6 is arranged on one side thereof. Furthermore, this machine 3
A pre-processing section 9 is rotatably supported in front of the pre-processing section by a pivot point a of a pre-processing section support pipe 7, and the pre-processing section 9 has a lifting chain 10, a cutting blade and the like. Further, a torque limiter internal case 11 is disposed in the main machine 3 at the pivot point a of the support pipe 7, and a torque limiter internal case 11 is arranged to transport the grain culm from the pre-processing section 9 to the feed chain 12 of the automatic threshing machine 5. A conveyor chain 13 is provided. Case 1
1, as shown in FIG. 2, a transmission shaft 16 having an input pulley 15 interlocked with the output shaft of the engine.
is rotatably supported, and the tip of the shaft 16 forms a stepped small diameter portion 16a. A movable clutch 17 is supported on the shaft 16 so as to be slidable only by a key, and is biased in the direction of arrow A by a spring 19, and the clutch 17 has a pawl 17a on one side. On the other hand, a transport drive shaft 20 is rotatably supported in the case 11 in alignment with the transmission shaft 16, and the stepped small diameter portion 16a of the transmission shaft 16 is inserted into the hole 20a formed at the tip of the drive shaft 20. They fit together to form a double shaft structure, and the shaft 2
A fixed clutch 21 is fixed to the tip of 0.
Clutch 21 has a pawl 21a on one side thereof, which normally engages pawl 17a of movable clutch 17, which is biased by spring 19. Note that both claws 17a and 20a have slopes at an angle θ on both sides, as shown in FIG.
A radius r is formed at the tip. Further, a rotation support shaft 22 is supported through the case 11, and an engagement piece 23 is fixed to the inside of the case of the support shaft 22. The tip of the engagement piece 23 has two high-bottom contact surfaces 23a and 23b, and the outer high contact surface 23a is connected to the outer peripheral surface 17 of the movable clutch 17.
c, and its width H is the same as the claws 17a,
It is slightly narrower than the engagement depth h of 21a. Furthermore, the engagement piece 23 has one of the contact surfaces 2
3a and 23b are biased by a spring 25 so as to come into contact with the outer peripheral surface 17c of the movable clutch 17, as shown in FIG. Further, an arm 26 is fixed to the support shaft 22 on the outside of the case 11, and the arm 26 is connected to the driver's seat via a connecting rod or the like.
It is connected to the set lever 29 of. On the other hand, one end of the case 11 is a sleeve 11a,
The base end 7a of the support pipe 7 is rotatably supported by the sleeve 11a, and constitutes a pivot point a of the pretreatment section 9. Further, the conveyance drive shaft 20 extends into the base end 7a of the support pipe, drives the conveyance chain 12, and has a bevel gear 31 positioned and fixed by a collar 30. The bevel gear 31 meshes with a bevel gear 33 fixed to the tip of a pretreatment section drive shaft 32 rotatably supported by the support pipe 7.

Since this embodiment has the above configuration, the rotation of the engine is transmitted to the crawler 2 and the threshing machine 5, and is also transmitted to the transmission shaft 16 via the input pulley 15.
can be conveyed to. If there is no overload on each device of the pre-processing section 9 and the conveyance chain 13, the claws 17 of both clutches 17, 21 based on springs 19
By the engagement of a and 21a, the rotation of the transmission shaft 16 is transmitted to the conveyance drive shaft 20, which drives the conveyance chain 13, and at the same time is transmitted to the preprocessing section drive shaft 32 via the bevel gears 31 and 33, and drives the lifting chain. 10 and the cutting blade etc. At this time, the engaging piece 2
3 has its higher contact surface 23a in contact with the outer peripheral surface 17c of the movable clutch 17. If an overload occurs in the pre-processing section 9, etc., the rotation of the fixed clutch 21 is about to be stopped.
9 in the direction opposite to the arrow A, and after the movable clutch 17 has been moved to the engagement depth h, both claws 17a,
The engagement of 21a is released. At this time, with the movable clutch 17 moved by a width H that is slightly shorter than the depth h, the engagement piece 23 is moved by the spring 25 so that its bottom contact surface 23b comes into contact with the outer peripheral surface 17c of the movable clutch 17. Rotate. This results in
The movable clutch 17 has its end surface 17b joined to the stepped portion 23c of the engagement piece 23, and is held in that position against the biasing force of the spring 19.
The movable clutch 17 slips into contact with the radius r at its tip, making a slight rattling sound, and the movable clutch 17 idles, stopping power transmission to the drive shaft 20. Note that this state remains the same even after the overload is removed. Next, after removing the cause of the overload, the set lever 29 of the driver's seat 6 is operated to rotate the engagement piece 23 against the spring 25, so that the stepped portion 23c
The arm of the movable clutch 17 is released, the movable clutch 17 is moved toward the fixed clutch 21 by the spring 19, and the claws 17a, 21a are engaged again. As a result, as described above, the transmission shaft 1
6 is transmitted to the conveyance drive shaft 20.

As explained above, according to the present invention, when an overload occurs, the movable clutch 17 is held in a nearly disengaged state by the engagement piece 23, so that the claw 17a,
It is possible to prevent the noise generated when the 21a is repeatedly engaged and disengaged, and also to prevent the wear caused by the noise. In addition, once an overload occurs and the torque limiter is activated, the transmission will be stopped unless it is released by operating the set lever 29, so the device may suddenly activate while the cause of the overload is being removed, resulting in an accident. can be prevented from occurring. Furthermore, since there is no need to replace the shear pin, work efficiency can be improved.
Further, the tips of the pawls 17a and 21a have a surface r smoother than the inclined surface, and only the smooth surface r is joined with the movement of the movable clutch 17 being restricted by the locking piece 23. A light rattling sliding sound can alert the worker to the occurrence of an overload, and the warning can be issued and read during a non-transmission state due to the occurrence of an overload, ensuring that the operator can continue working without noticing the non-transmission state. can be prevented. Further, if the set lever 29 is disposed on the driver's seat 6, there is no need to get out of the vehicle each time, which is very convenient.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a combine harvester to which the present invention is applied, Fig. 2 is a front sectional view showing the torque limiter device according to the invention, Fig. 3 is a side sectional view thereof, and Fig. 4 shows a clutch pawl. It is a partially enlarged view. DESCRIPTION OF SYMBOLS 1... Combine harvester, 6... Driver's seat, 17... Movable clutch, 17a... Pawl, 21... Fixed clutch, 21a... Pawl, 23... Engaging piece, 23a...
Higher contact surface, 23b... Bottom contact surface, 29... Set lever, r... Smooth surface.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A torque limiter comprising a fixed clutch and a movable clutch biased toward the fixed clutch, and capable of continuing power transmission by engaging and disengaging claws of both clutches, The pawls of the clutch have inclined surfaces that engage with each other, and
At least one of the distal ends thereof is provided with an engagement piece having a smoother surface than the inclined surface and capable of contacting the outer surface of the movable clutch to restrict movement of the movable clutch, and the engagement piece However, under normal transmission conditions, the movable clutch is allowed to move toward the fixed clutch, and when the claws of both clutches come off due to overload, only the smooth surfaces are joined. A torque limiter device configured such that the movable clutch is regulated by the movable clutch, and the engagement piece is configured such that the movable clutch can be released from the regulation by a set lever. (2) The torque limiter device according to claim 1, wherein the torque limiter is interposed in a transmission line of a pre-processing section of a combine harvester, and the set lever is disposed at a driver's seat.