JP2007032583A - Belt transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein occurrence of failure that a V belt engaged and stretched around between a driven pulley fixed to an end of a grain discharge spiral shaft and a driving pulley on a driving force input side comes off both pulleys due to vibration of a machine body caused during running on a road while a tension clutch is off and vibration of the machine body caused when conveying a combine by a transportation vehicle such as a truck in a belt transmission device for the combine provided with the tension clutch for switching into a tension condition and a slack condition. <P>SOLUTION: This belt transmission device is provided with elastically deformable belt guides 51, 61 for covering the outer periphery of the V belt 34 engaged with and stretched over the driven pulley 33 facing the direction of outer side of the machine body. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a belt transmission device provided with a belt guide for preventing a V belt engaged with a drive pulley and a driven pulley from being separated from both pulleys.

  2. Description of the Related Art Conventionally, in a belt transmission device including a tension pulley that tightens and loosens a V-belt that is engaged with a drive pulley and a driven pulley, a tension clutch that separates the tension pulley from the V-belt is in an off state, and the V In order to prevent the belt from coming off, a belt transmission device is known in which a plurality of belt guides are fixed to the base of a tension arm that pivotally supports the tension pulley and the tension arm is pivotally supported coaxially with the drive pulley. . (For example, refer to Patent Document 1).

Moreover, in the conventional combine, the grain tank which stores the selected grain temporarily is in an upright posture state where the grain is stored around the axis of the grain discharge spiral axis at the bottom of the grain tank. And a tiltable posture state inclined by a predetermined angle toward the outside of the machine body, and a driven pulley fixed to the shaft end of the grain discharge spiral shaft and a drive pulley on the drive force input side When a belt transmission device is provided with a tension clutch that switches the tensioned pulley between the tension belt and the tension state, and when the tension belt is off and the tension belt is switched to the tension state In order to prevent the V belt from coming off, a belt guide is provided in the vicinity of the outer periphery of the driving pulley and the driven pulley. (For example, refer to Patent Document 2).
Japanese Utility Model Publication No. 61-85757 (FIGS. 1 to 3) Japanese Utility Model Publication No. 1-130630 (FIGS. 3 to 6)

  The belt guides of Patent Document 1 and Patent Document 2 described above are formed using a round bar so that the tip end faces the outer peripheral side of the drive pulley or the driven pulley, and the relaxed state when the tension clutch is off. In order to prevent the V-belt in the belt from coming off from both pulleys, the belt guide is used to securely hold the V-belt from the outside of both pulleys. In the belt guide having such a configuration, the tension clutch is turned off. The V-belt is disengaged from both pulleys due to the machine vibration during road running in the state where the drive of the combine grain discharge spiral shaft is stopped or the machine vibration when the combine is transported by a transport vehicle such as a truck. There was a risk of malfunction.

  The invention of claim 1 devised for the purpose of solving the above-mentioned problems is a belt transmission device comprising a tension clutch for tightening and loosening a belt engaged with a drive pulley and a driven pulley, and elastically deforming the outer periphery of the driven pulley. The first feature is that the belt is covered with a possible belt guide.

  In the invention of claim 2, the belt transmission device is a power transmission means for driving the grain discharge spiral shaft of the combine, and the belt guide is provided on the outer peripheral side of the belt that is engaged with the driven pulley facing the outer side of the machine body. The arrangement is the second feature.

  According to the first aspect of the present invention, in the belt transmission device having a tension clutch for tightening and loosening the belt engaged with the driving pulley and the driven pulley, the outer periphery of the driven pulley is covered with a belt guide capable of elastic deformation. Thus, it is possible to reliably prevent the belt in the relaxed state from coming off from the outer periphery of the driven pulley while the tension clutch is off, and when replacing the belt, by elastically deforming the belt guide, Since the belt can be easily removed from the outer periphery of the driven pulley, workability is improved.

  According to the second aspect of the present invention, the belt transmission device is a power transmission means for driving the grain discharge spiral shaft of the combine, and the belt is disposed on the outer peripheral side of the belt engaged with the driven pulley facing the outer side of the machine body. When the tension clutch is off, that is, when the drive of the combine grain discharge spiral shaft is stopped, the machine body vibration when traveling on the road or when the combine is transported by a transport vehicle such as a truck Therefore, it is possible to reliably prevent a problem that the V-belt is detached from the outer periphery of the driven pulley due to the vibration of the machine body.

  Moreover, in the combine of the structure which supports the grain tank which stores the selected grain temporarily at the center of the longitudinal spiral axis behind the storage tank and the open position, the bottom of the grain tank The belt guide on the driven pulley side fixed to the shaft end of the grain discharge spiral shaft, that is, the belt guide arranged on the outer periphery side of the belt engaged with the driven pulley facing the outer side of the machine body is easily elastically deformed from the outside of the machine body As a result, it is possible to easily attach / remove (removal) the belt engaged with the drive pulley and the driven pulley, and rotate the grain tank to the storage position and the release position for maintenance. It is possible to shorten the work time when making it.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1 and FIG. 2, the combine 11 includes a pre-processing unit 12 that cuts the cereal, a threshing device 13 that threshs the grain from the harvested cereal, and selects the grain, and the selected grain. A grain tank 14 that temporarily stores grains, a post-processing unit 15 that discharges threshed waste, a driver's seat 16 on which an operator is seated, a control unit 17 that includes various operating tools, and a pair of left and right A machine frame 19 is provided in which crawler travel devices 18L and 18R are arranged along the travel direction.

  The grains stored in the grain tank 14 are a fixed pipe (not shown) fixed to the lower end of the rear surface of the grain tank 14, a vertical pipe 21 that is rotatably connected to the fixed pipe, and the vertical pipe. It connects to the upper end of 21 so that integral rotation is possible, and it can discharge | emit out of the machine now via the grain discharge auger 22 which can carry out raising / lowering operation | movement.

  More specifically, engine power (not shown) is transmitted to an input pulley 27 of the counter case 26 via an output pulley 24 and a V belt 25 provided on the output shaft 23, and then the output pulley 28 of the counter case 26 is used as a drive pulley. Belt transmission device 31, that is, a driven pulley 33 fixed to the shaft end of the grain discharge spiral shaft 32 at the bottom of the grain tank 14, a V-belt 34 engaged with the pulleys 28, 33, and the V-belt 34 It is transmitted to the grain discharge auger 22 via a belt transmission 31 provided with a tension clutch 35 and the like for tightening and loosening the nut.

The tightening / relaxation of the V-belt 34 by the tension clutch 35 described above is performed by turning on / off a grain discharge switch 36 provided at the rear of the driver's seat 16, and by turning this grain discharge switch 36 on / off, As shown in FIG. 3, the discharge clutch motor 37 fixed to the upper front of the grain tank 14 is driven to rotate forward or reverse, and then meshes with an output gear (not shown) of the discharge clutch motor 37 to rotate. The tension clutch 35 is configured to rotate via a gear arm 38, an arc-shaped link 39 connected to the tip of the gear arm 38, a tension spring 41 connected to the other end of the arc-shaped link 39, and a wire 42. Yes. That is, the tension clutch 35 includes a clutch arm 44 that pivotally supports the front side plate 43 of the grain tank 14 in the direction of arrow A in the drawing and a tension pulley 45 provided at the tip of the clutch arm 44. It consists of and.

  Further, in the vicinity of the outer periphery of the drive pulley (output pulley) 28 constituting the belt transmission device 31, a belt guide 46 formed by bending a plate in a substantially U shape is attached to the counter case 26 so as to wrap the drive pulley 28. The belt guide 46 prevents the V belt 34 from being detached from the drive pulley 28 side.

  On the other hand, in the vicinity of the upper part of the outer periphery of the driven pulley 33, a belt guide 47 formed by bending a plate in an L shape is fixed to the front plate 43 of the grain tank 14 so that the bent tip is close to the driven pulley 33. In addition, a rod-shaped belt guide 48 or the like fixed to the front plate 43 of the grain tank 14 is provided near the side of the outer periphery of the driven pulley 33 so that the tip thereof faces the outer peripheral side of the driven pulley. In the present invention, there are provided elastically deformable belt guides 51 and 61 for covering the outer periphery of the driven pulley 33, which will be described in detail later. The belt guides 51 and 61 will be described below.

  The belt guide 51 is made of thermoplastic polyurethane, which is superior in wear resistance than general rubber and superior in stretchability / elasticity than general thermoplastic resin. The first embodiment shown in FIG. The base end of the belt guide 51 is formed in the grain tank so that the front end is formed in a U shape and the outer end is covered in the vicinity of the lower portion of the driven pulley 33. 14 is screwed to a support plate 52 fixed to the front side plate 43.

  That is, in the belt transmission 31 provided with the tension clutch 35 for tightening and loosening the V-belt 34 engaged with the drive pulley 28 and the driven pulley 33 as described above, the elastically deformable belt guide for covering the outer periphery of the driven pulley 33. By providing 51, it is possible to reliably prevent the loosened V-belt 34 from coming off the outer periphery of the driven pulley 33 when the tension clutch 35 is off, and when replacing the V-belt 34, By elastically deforming the tip of the belt guide 51, the V belt 34 can be easily detached from the outer periphery of the driven pulley 33, so that workability is improved.

  The belt transmission device 31 drives the grain discharging spiral shaft 32 of the combine 11 in which the belt guide 51 is arranged on the outer peripheral side of the V belt 34 that is engaged with the driven pulley 33 facing the outer side of the machine body. It is a transmission means, and the body vibration when traveling on the road with the tension clutch 35 turned off, that is, the drive of the grain discharging spiral shaft 32 of the combine 11 is stopped, and the combine 11 is transported by a transport vehicle such as a truck. It is possible to reliably prevent a problem that the V-belt 34 is detached from the outer periphery of the drive pulley 28 and the driven pulley 33 due to machine vibration or the like.

  Furthermore, the combine of the structure which supports the grain tank 14 which stores the selected grain temporarily around the center of the longitudinal spiral axis Y (refer FIG. 1) of the back so that rotation is possible over an accommodation position and an open position. 11, the outer periphery of the belt belt 51 on the driven pulley 33 side fixed to the shaft end of the grain discharge spiral shaft 32 at the bottom of the grain tank 14, that is, the V belt 34 engaged with the driven pulley 33 facing the outer side of the machine body. The belt guide 51 arranged on the side can be easily elastically deformed from the outside of the machine body, thereby easily attaching / detaching (removing) the V-belt 34 engaged with the driving pulley 28 and the driven pulley 33. This makes it possible to reduce the work time when the grain tank 14 is rotated to the storage position and the open position for maintenance or the like.

  Further, the belt guide 61 of the second embodiment shown in FIGS. 5 and 6 is made of the same thermoplastic polyurethane as that of the first embodiment, and the outer periphery of the V belt 34 wound around the driven pulley 33 facing the outer side of the machine body. The belt guide 61 is configured to be continuously mounted up and down from the side, and is hatched for convenience in FIG. 6 so that the belt guide 61 can be mounted from the outer peripheral side of the driven pulley 33. A long hole 61a wider than the driven pulley 33 is provided, and as shown in FIG. 5, the belt guide 61 mounted from the outer peripheral side of the driven pulley 33 is screwed in a state of being bent toward the grain discharge spiral shaft 32. In order to install, upper and lower support plates 62 and 52 for screwing the belt guide 61 are fixed to the front plate 43 of the grain tank 14.

  According to the belt guide 61 of the second embodiment described above, the upper and lower ends of the elongated hole 61a of the belt guide 61 are portions where the outer periphery of the driven pulley 33 is covered, that is, two upper and lower C1 shown in FIGS. , C2 position, it is possible to more reliably prevent the loosened V-belt 34 from coming off the outer periphery of the driven pulley 33 when the tension clutch 35 is off. When the V-belt 34 is replaced, the belt guide 61 is elastically deformed in the direction away from the driven pulley 33 from the outside of the machine body, and is engaged with the drive pulley 28 and the driven pulley 33 as in the first embodiment. The attachment / detachment (detachment) work of the V belt 34 can be easily performed.

  By the way, when the combine 11 is not used temporarily due to rain or the like, it is necessary to hang a box-shaped cover covering the entire body in the field, but particularly when the combine 11 is large, the cabin 66 and grain protruding from the body. The cover is easily caught on the particle discharge auger 22, and a plurality of workers are required to quickly perform the covering operation while removing the portion where the cover is caught.

  Therefore, as shown in FIG. 7, a pair of left and right arched guide pipes 67, 67 passing above the combine 11 in the front-rear direction of the machine body are prepared, and both ends of the guide pipes 67, 67 are pierced into the field. As shown in FIG. 8, the box-shaped cover 68 that covers the entire machine body can be changed from a two-dot chain line box-type state to a solid-line unfolded state using a fastener or the like (not shown). None, and a plurality of carabiner-type rings 69 are attached at predetermined intervals to the left and right corners in the front-rear direction of the unfolded cover 68 formed at the same interval as the pair of left and right guide pipes 67, 67. The ring 69 is sequentially set on the pair of left and right guide pipes 67 and 67 from the rear side of the machine body, and then a pair of left and right ropes 71 and 71 provided at the tip of the cover 68 as shown in FIG. By pulling progressively the cover 68 on the body front side with, so enabling smooth cover threading operation with small. When the cover 68 is moved to a predetermined position and each fastener is closed, the combine 11 can be covered with the box-shaped cover 68.

The side view of a combine. The top view of a combine. The front view of a belt transmission device and a grain tank. The perspective view of the periphery of a driven pulley which shows the structure of a 1st Example. The front view of the belt transmission apparatus which shows the structure of a 2nd Example. B arrow view in FIG. The perspective view which shows the cover covering method of a combine. The expanded view which shows the structure of a cover.

Explanation of symbols

11 Combine 28 Drive pulley 31 Belt drive 33 Driven pulley 34 Belt 35 Tension clutch 51 Belt guide (first embodiment)
61 Belt guide (second embodiment)

Claims (2)

  In a belt transmission (31) having a tension clutch (35) for tightening and loosening a belt (34) engaged with a drive pulley (28) and a driven pulley (33), the outer periphery of the driven pulley (33) is elastically deformed. A belt transmission device, characterized in that it is covered with possible belt guides (51, 61).   The belt transmission device (31) is a power transmission means for driving the grain discharge spiral shaft (32) of the combine (11), and is a belt (34) engaged with a driven pulley (33) facing the outer side of the machine body. 2. The belt transmission device according to claim 1, wherein belt guides (51, 61) are arranged on the outer peripheral side.

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