JPH0570246U - Transmission structure of handle - Google Patents

Abstract

(57) [Abstract] [Purpose] To avoid inconvenience of the drive system of the handling cylinder such as lack of bevel gear due to excessive belt tension caused by the rapid engagement operation of the threshing clutch. [Structure] A belt tension mechanism B in which a belt 25 wound around a drive-side transmission pulley 22 and an input pulley 24 of a handle barrel shaft 23 is pulled by a spring 26 from a tension arm 27 that pivotally supports a tension roller 28. A rod connected to the tensioning arm 27 for tensioning the belt, and for the first regulating mechanism C that terminates the movement amount of the tension roller 28 toward the belt slackening side within a range where the winding spring 26 does not adhere, and the movement amount toward the belt tensioning side. There is provided a second restricting mechanism D which is set within a predetermined range by the contact between the double nut 34 of 30 and the fixing member 29.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a technique for improving the inconvenience caused by sudden engagement and disengagement of a clutch. Specifically, the belt is wound around a transmission pulley to which power is input and an input pulley of a handle barrel shaft. The present invention relates to a power transmission structure for a handling cylinder equipped with a belt tensioning mechanism for biasing the belt.

[0002]

[Prior Art]

 Conventionally, in this type of transmission structure, as shown in FIG. 9 of Japanese Utility Model Application Laid-Open No. 3-122629, the handling cylinder is driven and rotated by a belt transmission mechanism, which is caused by the change with time of the belt. In order to apply a reliable driving force regardless of the looseness, a tension mechanism is provided to urge the belt with a spring and a tension roller.

[0003]

[Problems to be solved by the device]

 Normally, a threshing clutch (often a belt tension type) is equipped on the upper side of the power transmission path of the belt transmission mechanism described above, but if the threshing clutch is suddenly turned on and operated, a large inertial mass can be handled. Due to the body, the clutch shock may be large, and the part on the moving side of the belt may vibrate violently due to a stall or abrupt pulling of the belt. In particular, if the part of the belt on the following movement side vibrates violently, the tension roller will vibrate abnormally. However, a huge amount of unintended tension may act instantaneously on the belt, which may damage the drive system components of the handling cylinder, such as missing gears. An object of the present invention is to eliminate the inconvenience in the above drive system caused by the rapid engagement operation of the threshing clutch.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention, in the transmission structure of the handling cylinder described at the beginning, supports the tension roller on the movable member that is biased by the compression type winding spring, and causes the tension roller to act on the belt. The belt tensioning mechanism constitutes the relative tension between the receiving member and the fixed member between the receiving member on the movable member side that receives the biasing force of the winding spring and the fixing member that receives the pressing biasing reaction force of the winding spring. A first regulating mechanism that sets a maximum movable range to one side of the tension roller via a spacer that ends the operation within a range where the winding spring does not come into close contact is formed, and the fastening member is fixed to the movable member. A fixed-side support member is provided to support the movable member so that the movable member can move relative to each other, and the maximum movable range of the tension roller to the other can be set within a predetermined range by the contact between the fixing member and the support member. A characteristic configuration and be shall that have configured second regulating mechanism for setting within.

[0005]

[Action]

 In the belt tension structure of the above-mentioned publication, since the spring is simply installed over the arm of the tension roller and the vertical wall of the threshing device, the tension roller swings to the tension side until the spring is tightly attached, and However, I realized that there was no limit to the movement on the belt tension side, and the structure was such that the tension roller was allowed to vibrate violently indefinitely. Therefore, it was predicted that restricting the moving ranges of the tension roller on the tension side and the anti-tension side would prevent the occurrence of abnormal belt tension due to the sudden engagement operation of the threshing clutch described above. In other words, the regulation of the above-mentioned movement range is intended to prevent a large urging force due to a large displacement of the tension roller from acting at the same time when the belt itself swings largely to the biting side. , The first regulation mechanism and the second regulation mechanism. However, in the transmission structure that employs the structure in which the moving ranges of the tension mechanism on the tension side and the anti-tension side are regulated by the first regulation mechanism and the second regulation mechanism, as expected from the experimental results, A huge amount of unintended tension is no longer applied to the belt, and the phenomenon of damage to the drive system components of the handling cylinder, such as the lack of gears, no longer occurs. Then, together with the first and second regulating mechanisms (details will be described in the embodiment), simple modification is performed by using existing parts and small members in the belt tensioning mechanism such as spacers and fastening members. It can be configured with only one, and there is no need for major remodeling or special equipment.

[0006]

[Effect of the device]

 Therefore, by observing and examining the behavior of the belt tensioning mechanism in detail, the tensioning range of the tensioning mechanism can be regulated by the first and second regulating mechanisms having a simple structure, and the drive system of the handling cylinder can be protected. Therefore, it was possible to provide a power transmission structure for the handling cylinder that can be economically improved in durability and reliability without the disadvantage of making major modifications.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings in the case of an all culm input type combine. FIG. 5 shows an all culm throw type combine, 1 is a mowing section, 2 is a threshing section 3 and the like, a threshing section, 4 is a sorting section, 5 is a crawler traveling device, and 6 is a control section. In FIG. 3, reference numeral 7 denotes a counter shaft to which engine power is input. A belt 10 is wound around the counter shaft 7 and an input shaft 9 of a bevel gear mechanism 8 that is interlocked with the handling cylinder 3, and A belt tension type threshing clutch 12 is constructed by loosening the belt 10 with a tension pulley 11. Further, a belt 25 is wound around the transmission pulley 22 of the output shaft of the bevel gear mechanism 8 and the input pulley 24 of the shaft 23 of the handling cylinder 3, and a belt tensioning mechanism B for biasing the belt 25 is provided. There is. Hereinafter, the structures of the threshing clutch 12 and the belt tensioning mechanism B will be described step by step.

Regarding the threshing clutch 12. As shown in FIGS. 3 and 4, the tension arm 13 for supporting the tension pulley 11 is constituted so that the balance can swing around the fulcrum P, and the tension arm 13 is interlocked with the operation lever 20 provided in the control section 6. The threshing clutch 12 is provided with an interchange operation mechanism A for operating the threshing clutch 12. That is, the first rod 14, the first L-shaped crank 15, the compression type tension spring 16, the push-pull rod 17, the second L-shaped crank 18, and the second rod 19 which are connected to the arm tip side portion of the tension arm 13 are used for the accommodation operation. Mechanism A is configured. In the figure, the push-pull rod 17 is pivotally supported on the right side of the tension spring 16 and the first L-shaped crank 15 is pivotally supported on the left side of the tension spring 16, respectively. Penetrates the lower end of the. Further, a damper 21 is provided at the arm tip of the tension arm 13 so as to exert resistance in the moving direction of the tension pulley 11 to the belt tension side. The damper 21 may be a single-effect type or a double-effect type. To explain the operation of the clutch operation, when the operation lever 20 is operated to the entry side, the push-pull rod 17 compresses the tension spring 16 (state of FIG. 3), and the reaction force causes the tension arm 13 to rotate clockwise. The belt 10 is urged to tension the belt 10 so that the belt 10 is clamped (state shown in FIG. 4). At this time, a resistance acts on the tension arm 13 due to the action of the damper 21 and causes the tension arm 13 to swing slowly. Therefore, even if the operation lever 20 is momentarily turned on and off, the tension arm 13 oscillates at a slow speed due to the energy dissipating action of the damper 21, and the clutch engagement behavior becomes gentle with little shock. is there.

By the way, it is necessary to move the tension pulley 11 sufficiently to the belt slack side during the clutch disengagement operation, but it is impossible to move the tension pulley 11 to a reliable disengagement position due to a stroke error of the damper 21 or the like. For this reason, it is convenient if the hole for connecting the movable rod 21a of the damper 21 of the tension arm 13 is used as a long hole to allow flexibility so that the tension arm 13 can move sufficiently during the clutch disengagement operation.

Belt Tensioning Mechanism B As shown in FIGS. 1 and 2, the belt tensioning mechanism B includes a tension arm 27 (corresponding to a movable member) which is biased by a spring mechanism E by a compression type winding spring 26. The tension roller 28 is supported, and the tension roller 28 is made to act on the belt 25. Further, the first regulation mechanism C and the second regulation mechanism D are provided. The spring mechanism E includes a fixed member 29 fixed to the rear vertical wall 2a of the threshing unit 2, a rod (corresponding to a movable member) 30 that penetrates through the fixed member 29 and is pivotally connected to the tension arm 27, and a rod. It is composed of a spring receiving plate 32 which is prevented from coming off by a first double nut 31 at the tip of 30. The fixing member 29 includes a U-shaped fixing portion 29a and a spring receiving portion 29b through which the rod 30 is inserted. The first restricting mechanism C includes a spring receiving plate (corresponding to a receiving member on the movable member side) 32 that receives the pressing biasing force of the winding spring 26 and a fixing member 29 that receives the pressing biasing reaction force of the winding spring 26. The spring receiving plate 32 and the fixing member 29 are constituted by interposing a spacer 33 which ends the relative approaching operation within a range where the winding spring 26 does not come into close contact, and sets the maximum movable range of the tension roller 28 to the belt loosening side. With the function to do. The second restricting mechanism D is configured by fixing a second double nut (corresponding to a fastening member) 34 between the fixing member 29 and the tension arm 27 of the rod 30, and the second double nut 34 and the fixing member (movable). It has a function of setting the maximum movable range of the tension roller 28 to the belt tension side within a predetermined range by contact with a fixed side support member S (which supports the member in a relatively movable manner) 29. The adjusting nut 34A of the second double nut 34 has a threaded portion shorter than the entire length to form a ring-shaped contact portion 34a. This adjusts the tension by increasing the amount of tension as the belt 25 loosens over time. However, even if the threaded portion 30a of the rod 30 is partially worn and damaged due to sliding with the spring receiving portion 29b, the adjustment nut 34A can be removed. This is to allow sufficient adjustment movement to the left side in the figure. The distance L1 between the spacer 33 and the spring receiving plate 32 and the distance L2 between the adjusting nut 34A and the fixing member 29 are both set to 1 to 5 mm.

[Other Embodiment] As shown in FIG. 6, a second fixing member (corresponding to the supporting member S) 35 is provided through which the distal end side portion of the rod 30 is inserted, and the second fixing member 35 and the first double member are provided. A means for configuring the second regulation mechanism D by contact with the nut 31 may be used. In this case, there is an advantage that the belt tension side and the relaxation side can be adjusted all at once by the movement of the first double nut 31 in response to the loosening of the belt 25 over time. This is because, in the case of this embodiment, the adjustment of the belt tension side and the relaxation side needs to be performed separately for the first regulation mechanism and the second regulation mechanism. In the present invention, the tension roller 28 may be directly pivoted on the rod 30, and the tension arm 27 and the rod 30 are generically defined as the movable member K.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a side view showing the structure of a belt tensioning mechanism.

FIG. 2 is a system diagram showing a partially cutaway enlarged side view showing the structure of a second regulation mechanism.

FIG. 3 is an operation system diagram showing an operation structure of a threshing clutch.

FIG. 4 is a system diagram showing a flexible operating mechanism with a clutch engaged.

[Fig. 5] Overall side view of the combine

FIG. 6 is a side view showing another structure of the second regulation mechanism.

[Explanation of symbols]

 22 transmission pulley 23 handling barrel shaft 24 input pulley 25 belt 26 winding panel 28 tension roller 29 fixing member 32 receiving member 33 spacer 34 support member B belt tension mechanism C first restriction mechanism D second restriction mechanism K movable member S support member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Shinzo Kashino 64-64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A belt (25) is wound around a transmission pulley (22) to which power is input and an input pulley (24) of a handle shaft (23), and the belt (25) is attached. A transmission structure of a handling cylinder equipped with a biasing belt tensioning mechanism (B), in which a tension roller (2) is attached to a movable member (K) which is biased by a compression type winding spring (26).
8), the tension roller (28) acts on the belt (25) to form the belt tensioning mechanism (B), and the movable member (K) receives the pressing biasing force of the winding spring (26). ) Side receiving member (32) and the fixing member (29) which receives the pressing biasing reaction force of the winding spring (26), the relative approaching operation of these receiving member (32) and the fixing member (29). And a first restricting mechanism (C) for setting a maximum movable range to one side of the tension roller (28) by interposing a spacer (33) that terminates in a range where the winding spring (26) does not come into close contact. The fixing member (34) is fixed to the movable member (K), and a fixed-side support member (S) that supports the movable member (K) so as to be relatively movable is provided. And the support member (S) The tension roller (28)
The transmission structure of the handling cylinder which comprises the 2nd control mechanism (D) which sets the maximum movable range to the other side within a predetermined range.