JPH06101968B2 - Belt transmission mechanism of paddy discharge part - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a belt transmission mechanism of a paddy discharge part in a self-removing combine or a harvester.

<Prior Art> Conventionally, a mechanism has been known in which the power of a threshing unit such as a combine harvester and a paddy discharge unit including an auger is transmitted by a plurality of stages of belt transmission from an engine. In this belt transmission system,
Strengthening of the transmission system and the operating system to prevent deformation of the spiral part and the paddy discharge blade at the plugged part due to the occurrence of plugging of the paddy discharge part during power transmission from the engine, or damage to the transmission shaft, gears, etc. In addition to the method, a torque limiter device was attached and a sensor forced stop device was installed by a sensor. In addition, there is known a mechanism using the transmission clutch itself as a torque limiter.

<Problems to be Solved by the Invention> However, an increase in strength of a transmission system or an operation system causes an increase in size and weight of a device, and a device using a torque limiter or a sensor has a drawback of complicating a mechanism and increasing cost. .

If the transmission clutch is to have a torque limiter function, it is difficult to set the clutch pressure accurately. If this is low, slippage occurs when the clutch is "engaged". There is a drawback in that slipping is not performed and damage and deformation of each part cannot be avoided.

<Means for Solving the Problems> The apparatus of the present invention for solving the above-mentioned problems is a prime mover 1
A belt transmission system connected in multiple stages is provided between the paddle and the paddy discharge part, and the power transmission to the paddy discharge part is turned on and off by rolling contacting the belt drive system from the outer peripheral side of the belt 21 so that the pressing force can be adjusted. In a device provided with a belt clutch 22 for actuating, the loose side at the time of actuation of the belt 13 is elastically outside on the inner peripheral side of another belt 13 in the belt transmission system other than the belt 21 provided with the belt clutch 22. An overload actuating clutch 14 biased so as to push it to the
When an overload is applied to the belt 13, the belt winding angle θ formed when the centers of the pulleys 8 and 12 around which the belt 13 is wound and the both ends of the outer circumference around which the belt 13 is wound are connected. The feature is that it has a mechanism to reduce.

<Operation> The belt clutch 22 transmits sufficient power to the paddy discharge part by the belt 21 in the “on” state, and the overload actuating clutch 14 also maintains the power transmission of the belt transmission system during normal operation.
When an overload is applied to the paddy discharge part and the belt 13, the slack side of the belt 13 with respect to the pulleys 8 and 12 is expanded outward to reduce the belt winding angle, thereby slipping between the pulleys 8 and 12 and the belt 13. In order to prevent the deformation and damage of the paddy discharge part, the power transmission to the paddy discharge part or the like by the belt 13 is blocked by making the slip easily occur.

<Embodiment> The embodiment of the present invention illustrated below will be described in detail. FIG. 2 shows a belt transmission system of a paddy discharge portion according to the present invention, in which an output shaft 2 of an engine 1 and a threshing input shaft 3 have respective pulleys 4 respectively. ,
5 and a belt 6 wound between them, and a threshing clutch 7 is provided on the belt 6.

Another small-diameter pulley 8 fixed to the threshing input shaft 3 and a pulley 12 fitted to the input shaft 11 of the Glen input gear case 9
A belt 13 is wound between and, and the belt 13 is provided with an overload actuating clutch 14 described later. A pulley 16 fitted on the output shaft 15 of the gear case 9 and a paddle feeding spiral shaft 18 provided at the bottom of a grain tank 17 for paddy receiving.
A belt 21 is wound around the input side pulley 19 of
A belt clutch 22 for Glen input is provided on the belt 21. The output side of the spiral shaft 18 is connected to a paddy discharge auger 24 via a conveying spiral 23, and is a mechanism capable of rotating in sequence and sequentially performing cutting and threshing by an engine drive and paddy discharge by the auger. Reference numeral 25 denotes a sorting transmission pulley fitted on the end of the threshing input shaft 3.

The transmission system is configured as shown in FIGS. 1 to 3, and the input shaft 11 and the output shaft 15 in the gear case 9 are interconnected via a bevel gear 31. The overload actuating clutch 14 is supported by a clutch arm 32 that is rotatably fitted around the input shaft 11, and one end of the clutch arm 32 is provided on the loose side of the belt 13 (when a load is applied to the paddy discharge portion side, the belt A clutch roller 33, which is always inscribed inside the slackening side), is rotatably supported.
Further, the other end of the clutch arm 32 is connected to one end of a rod 36 which is axially slidably inserted into a bracket 35 protruding from the mounting base 34 of the gear case 9. A spring receiver 37 is fitted on the rod 36 so that the vertical position can be adjusted, and the bracket 35 and the spring receiver 37 are attached.
A spring 38 is externally mounted on the rod 36 between and, and the clutch roller 33 is constantly pressed against the loose side of the belt 13 from the inside so as to be urged in a direction to maintain the tension of the belt 13.

The threshing input shaft 3 consisting of a long shaft is axially supported on the machine body by bearings 39 and 41 between the pulleys 5 and 25 as shown in FIG.
A receiving roller 43 having 42 inserted therein is rotatably supported. A receiving arm 44 is attached to the side of the gear case 9 with respect to the receiving roller 43 by a bolt 45.
The bolt hole 46 of 44 is a long hole so that the tip of the receiving arm 44 can be moved in the axial direction of the threshing input shaft 3 to adjust the distance.

The tip of the receiving arm 44 is formed with a V-shaped concave groove portion 47 so as to contact the peripheral surface of the receiving roller 43 at two points and receive the same in the direction of the input shaft 11. By configuring the support of the end of the threshing input shaft 3 in this way, the threshing input shaft 3 can receive the threshing input shaft 3 even when the span of the pulleys 5 and 8 is long.
By adjusting the position and the direction of and tightening, the receiving arm 44 can be made to act as a reasonable bearing portion according to the axial center position of the shaft end. As a result, the threshing input shaft 3 is supported by the bearings 39 and 41 at two points to determine the axis, and the third arm is supported by the receiving arm 44 whose axial center position is adjustable.
The bending load does not act on the shaft, there is no need to adjust the shaft core during assembly, it is economical in terms of parts processing and the number of parts, and the bending load direction by the belt 13 and the direction of the receiving arm 44 are substantially the same. Since it does, it is easy to support and has good stability.

On the slack side of the belt 21 between the pulleys 16 and 19 (the side that causes slack when the spiral shaft 18 is loaded), a belt clutch
22 clutch rollers 51 are circumscribed, and a clutch arm 52 rotatably supporting the clutch roller 51 at its tip is rotatably rotatably supported at its base end on a mounting base 34. In this way, the belt clutch 22 is circumscribed with respect to the belt loop by increasing the belt winding angle when the clutch is engaged,
This is to ensure sufficient power transmission to the Glentank operating system. The clutch arm 52 is swung by the swinging wire 53, and the transmission / disconnection (clutch engagement / disengagement) operation via the belt 21 is performed. A spring (not shown) is connected to the wire 53 to urge the clutch arm 52 in the clutch engaging direction.

FIGS. 5 and 6 are explanatory diagrams showing the operating states of the above-described overload actuating clutch 14 and the belt clutch 22. The diameters of the pulleys 8 and 12 interconnected by the overload actuating clutch 14 are determined by the belt clutch 22. It is set to be smaller than the diameter of the pulleys 16 and 19 to be used. When the paddle discharge auger 24 or the like causes clogging and the load on the spiral shaft 18 increases, the belts 13 and 21 are deeply fitted into the pulleys 8 and 12 and the pulleys 16 and 19, and the power transmission side is stretched due to tension. On the slack side is 1
As shown in 3'and 21 ', greater slack is produced. Winding angle theta ₁ with respect to the pulley 8,12 resulting overload clutch 14 of the belt 13, the _{θ 2 θ 1 ', θ 2} ' will easily state slip becomes small to, on the contrary in the belt clutch 22 side The winding angle of the belt 21 with respect to the pulleys 16 and 19 is θ ₃ ,
The angle increases from θ ₄ to θ ₃ ′ and θ ₄ ′, and slip is less likely to occur.

Generally, D: pulley diameter (mm) θ: pulley wrap angle (rad) μ ′: pulley friction coefficient (= 0.96) t ₂ : belt slip torque T (kgm) when belt slack side tension (kg) is It is represented by. As is clear from the above equation, when the winding angle θ becomes large, the slip torque T becomes large and slipping becomes difficult. The pulley diameter D and the belt tension t ₂ also affect the slip torque, but the wrap angle θ has the greatest effect on the slip torque.

Therefore, according to the above-mentioned mechanism, while ensuring sufficient power transmission to the belt clutch 22 itself, and when an overload is applied to the paddy discharge part, the belt winding angle of the transmission pulleys 8 and 12 in the overload clutch 14 becomes small. Then, it acts in such a direction that slip easily occurs, and the transmission to the paddy discharge part is surely cut off.

<Effects of the Invention> According to the present invention configured as described above, since the belt transmission side itself is a torque limiter, a unique torque limiter device, an engine stop device, etc. are not required, and an inexpensive machine is provided. Can be provided. In addition, the transmission parts such as the transmission shaft and the gear can be downsized, and the paddy passage inside the discharge auger case can be widened so that the paddy can be discharged smoothly and damage to the paddy can be reduced.
Furthermore, since the weight of the transmission part can be reduced, the Glen tank part, which tends to be heavy in terms of balance of the machine body, is lightened, and the front-rear and left-right balance is improved. Also, the overload actuating clutch is a belt slip mechanism separate from the belt clutch, and the clutch itself that turns on and off by rolling on the outer circumference of the belt itself can hold a large belt wrap angle and secure sufficient power transmission. There are no slips or damage to the belt.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a plan cross-sectional view of an essential part of the device of the present invention, FIG. 2 is an overall explanatory view of a belt transmission system, and FIG.
FIG. 6 to FIG. 6 are side views and operation explanatory views of essential parts of the overload operation clutch and the belt clutch, and FIG. 7 is an exploded perspective view showing a support mechanism of the threshing input shaft. 1: Engine (motor), 8, 12: Pulley 13: Belt, 14: Overload operating clutch 21: Belt

Claims (1)

[Claims] 1. A belt transmission system connected in multiple stages between a prime mover (1) and a paddy discharge section, wherein a belt transmission system is rotatably connected from the outer peripheral side of the belt (21) to the belt transmission system. In a device provided with a belt clutch (22) for turning on and off the transmission power to the paddy discharge part, a belt (13) other than the belt (21) provided with the belt clutch (22) in the belt transmission system. ) Is provided on the inner peripheral side of the belt (13) by rolling contact with an overload actuating clutch (14) which is biased to elastically spread the loose side of the belt (13) during operation. Formed when the centers of the pulleys (8) and (12) around which the belt (13) is wound and the both ends of the outer circumference around which the belt (13) is wound are connected when an overload is applied to the belt (13). The belt transmission mechanism of the paddy discharge section, which is a mechanism to reduce the belt winding angle (θ).