JP2014016037A - Wheel for chain transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new structure requiring no chain guard without an advantage of a notch chain, concerning a wheel for a chain transmission device.SOLUTION: A chain has a bottom surface opening structure between a pair of platy portions 38 of a link, can be driven by engaging a sprocket tooth from a bottom surface opening portion of the link 16, and is equipped with notches 50 on a link bottom surface so as to enable the engagement with driving pins 62. A wheel disposes the driving pins 62 at equal intervals in a circumferential direction with the same pitch as a chain pitch between a pair of driving pin supporting plates 57 and 58. Between the driving pin supporting plates 57 and 58, sprocket disc 60 is disposed, and on an outer peripheral side of the driving pins 62, tooth portions 60A of the same pitch as the chain pitch are provided. The tooth portions 60A is engaged with barrels 44 of the chain, and simultaneously, the driving pins 62 are engaged with the notches 50 of the chain.

Description

The present invention relates to a chain transmission wheel , and is particularly suitable for use in a sewage treatment facility such as a sludge scraping device.

  In a sewage treatment facility such as a sedimentation basin, as a sludge scraping device, a scraping member is stretched between a pair of endless chains arranged in parallel at a predetermined interval, and is positioned along the lower surface of the processing tank by driving the chain. The scraping member is moved toward the sludge pit along the bottom surface of the treatment tank, and the sludge accumulated on the bottom surface of the treatment tank can be scraped to the sludge pit. Although there is a normal sprocket engagement type as a chain (Patent Document 1), there are many so-called notch chains recently (Patent Document 2) according to installation examples in municipal sewage facilities. A notch chain has a structure in which a series of links are connected endlessly with a connecting pin in the same way as a normal sprocket chain, but a notch is formed on the bottom of the link, and the drive wheel is not a sprocket, but a pair of disks. A thing provided with the drive pin spaced apart at equal intervals in the circumference direction is used. The notch chain transmits power by engaging the connecting pin with the notch in the drive part. In the driven part, the inner peripheral belly surface of the link is in contact with the surface of the driven wheel (sheave). It is said that there is an advantage that the life of the chain is extended as compared with the case where a normal sprocket is used because of the dispersion. On the other hand, the engagement between the drive pin and the notch in the notch chain is shallower than that of a normal sprocket, so that the notch is removed from the drive pin at the drive wheel portion (so-called tooth skipping). A chain guard is installed along the outer periphery.

JP-A-11-290846 JP 2006-326383 A

  In order to prevent tooth skipping, driving with a notch chain requires a chain guard on the outer periphery of the drive wheel, but when used in a sewage treatment system such as a sedimentation basin, foreign objects get entangled with the chain guard drive wheel facing part (gap). There was concern. In addition, the chain guard requires a bracket for mounting, and the structure of this part is complicated, and the mounting structure is complicated depending on the frame structure of the sedimentation basin, and it may be difficult in an extreme case.

  The present invention has been made in view of such problems of the prior art, and an object thereof is to provide a novel structure that eliminates the need for a chain guard without impairing the advantages of the notch chain.

According to this invention, a wheel for a chain transmission device,
A support body fixed to the rotating shaft;
An annular sprocket disk fixed to the support body,
The sprocket disk forms teeth on the outer periphery at equal intervals in the circumferential direction at a pitch equal to the link pitch of the chain, and
A chain transmission provided with drive pins arranged on the sprocket disk at equal intervals in the circumferential direction at a pitch equal to the link pitch of the chain on the inner side of the tooth part, and each end projecting outward from the sprocket disk. An apparatus wheel is provided.

  According to the present invention, the chain transmission wheel includes the drive pin and the tooth portion having a pitch corresponding to the chain pitch, and the notch portion and the drive pin can be used on the drive side of the chain to perform reliable power transmission. In addition, a chain guard is unnecessary, and on the driven side, a sheave wheel can be used in addition to a normal sprocket, and the advantage of the notch chain is not impaired.

FIG. 1 is a cross-sectional view of each part before connecting adjacent links in a chain using the wheel of the present invention. 2 is a front view of a connecting pin which is a component of the chain of FIG. 1, and is a view taken along the line II-II of FIG. FIG. 3 is a front view of a locking ring that is a component of the chain of FIG. 1, and is a view taken along the line III-III of FIG. 4 is a front view of a lock piece that is a component of the chain of FIG. 1, and is a view taken along the line IV-IV of FIG. FIG. 5 is a cross-sectional view of the assembled state of the chain of FIG. 6 is a side view of a link (plate-like portion) that is a component of the chain of FIG. 1, and is a view taken along the line VI-VI of FIG. FIG. 7 is a front view of the wheel 6 of the present invention in mesh with the chain of FIGS. 1 to 6, and is a view taken along the line VII-VII of FIG. 8 is a cross-sectional view of the wheel of FIG. 7, and is a view taken along the line VIII-VIII of FIG. FIG. 9 is a view showing the engagement state of the wheel of the present invention with the drive pin and the tooth portion in the chain, as seen from the IX direction of FIG.

  FIG. 1 shows a chain used in the chain transmission of the present invention in a disassembled state of adjacent links. All parts of the chain are molded parts made of synthetic resin, and the connecting pin 10, the locking ring 12, and the lock piece 14 are the basic components. The connecting pin 10 includes a shaft portion 18, a head portion 20 at one end of the shaft portion 18, and a reduced diameter portion 22 at the other end of the shaft portion 18. The head 20 has a width across flats as shown in FIG. A pair of locking projections 24 extending radially until the outer diameter of the shaft portion 18 is flush with the outer diameter of the shaft portion 18 are formed on the diameter reducing portion 22 of the connecting pin (see FIG. 5). Each locking projection 24 extends from the end face of the connecting pin 10 along the axis, but terminates with some separation from the shaft portion 18.

  As shown in FIG. 3, the locking ring 12 has a bottomed locking groove formed in the middle between a pair of insertion grooves 29 diametrically opposite each other extending in the entire circumference on the inner periphery thereof and the groove 29. 30. The grooves 29 and 30 have a width that allows the locking protrusion 24 of the connecting pin 10 to be inserted freely in the axial direction without substantial play. The insertion groove 29 extends the entire length in the axial direction, but the locking groove 30 terminates in the axial direction from the outer surface of the locking ring 12 (FIG. 1).

  As shown in FIG. 4, the lock piece 14 is configured by cutting a ring having an inner diameter R somewhat larger than the outer diameter of the reduced diameter portion 22 of the connecting pin 10 at a portion 14 </ b> A of about 30 degrees in the circumferential direction. Therefore, the lock piece 14 presents a bifurcated portion 32 when viewed from the front. Since the cut portion 14A has a central angle of about 30 degrees, the connection pin 10 is attached to the reduced diameter portion 22 by elastically deforming the bifurcated portion 32. After the attachment, the bifurcated portion 32 is inherently elastic. The distal end of the bifurcated portion 32 becomes a protruding portion radially inward with respect to the outer diameter of the connecting pin (the outer diameter of the reduced diameter portion 22), and the engaged state with the reduced diameter portion 22 is elastically reduced. Maintain with. Further, the tip 32A of the bifurcated portion 32 is tapered as shown in FIG. 1, and the insertion operation of the lock piece 14 is smooth. The lock piece 14 is provided with an overhang portion 34 on the outer periphery at a position opposite to the cutout portion 14A in diameter, the overhang portion 34 protrudes in the radial direction, and the overhang portion 34 is a remaining portion of the lock piece 14 on the inner surface side. However, the outer surface side protrudes somewhat outward in the axial direction, and an engagement hole 36 for a punching tool is formed in this axial direction protruding portion.

  As shown in FIG. 1, each link 16 includes a pair of plate-like portions 38, each plate-like portion 38 includes a narrowed portion 38-1 and an expanded portion 38-2, and the pair of plate-like portions 38 is narrowed. The connecting pin insertion holes 40 and 42 are formed so that the portion 38-1 and the expanding portion 38-2 face each other and are aligned. A barrel 44 (cylindrical portion) is integrally formed between the narrowed portions 38-1 of the pair of plate-like portions 38 so as to be aligned with the connecting pin insertion hole 40. A gap S is formed between the pair of plate-like portions 38 from the barrel to the opposed widened portion 38-2, and the narrowed portion 38-1 of the link 16 adjacent to the gap S is inserted as shown in FIG. Then, the connecting pin insertion holes 40 and 42 are aligned between the adjacent links 16. Then, the connecting pin 10 is inserted into the pin insertion holes 42 and 40 on one side, the barrel 44 and the pin insertion holes 40 and 42 on the opposite side from the reduced diameter portion 22 through the spacer 46, and the head 20 of the connecting pin 10. Is in contact with the side surface of the opposing outer plate-like portion 38, and the tip of the connecting pin 10 projects from the side surface of the opposite plate-like portion 38.

  The other spacer 48 is inserted into the tip of the connecting pin 10 protruding from the side surface of the plate-like portion 38, and then the locking ring 12 is inserted. At this time, the locking ring 12 can be inserted until it is completely removed from the locking projection 24 of the connecting pin 10 by aligning the insertion groove 29 of the locking ring 12 with the locking projection 24. Then, the locking ring 12 is turned 90 degrees with respect to the connecting pin 10, and the locking ring 12 is moved on the connecting pin 10 so as to be pulled slightly outward in the axial direction, whereby the locking protrusion 24 of the connecting pin 10 is moved. The locking ring 12 can be engaged with the bottomed locking groove 30. The lock piece 14 has a radial direction so that the forked portion 32 straddles the reduced diameter portion 22 of the connecting pin 10 and the tapered tip 32A of the forked portion 32 is positioned between the spacer 48 and the locking ring 12. Mounted from the outside. The lock piece 14 can be smoothly mounted in the gap portion by appropriately setting the thickness of the bifurcated portion 32 with respect to the gap between the link 38 and the opposed surface of the spacer 48. Therefore, the engagement state between the locking protrusion 24 and the locking groove 30 can be maintained. When the lock piece 14 is mounted, the tip of the bifurcated portion 32 is initially in contact with the reduced diameter portion 22 of the connecting pin 10 in the cut portion 14A, but the lock piece 14 is hit with a tool such as a plastic hammer at the overhang portion 34. Thus, the bifurcated portion 32 is expanded against its elasticity, the bifurcated portion 32 is passed through the connecting pin 10, and the bifurcated portion 32 is restored to its original state by elasticity. The insertion of the lock piece 14 simultaneously displaces the locking ring 12 in the axial direction by an amount corresponding to the thickness of the locking piece 14, which includes the locking protrusion 24 of the connecting pin 10 and the bottomed locking groove 30 of the locking ring 12. Deepen the engagement (does not loosen in the axial direction). Therefore, when the lock piece 14 is mounted, the engagement state between the locking protrusion 24 and the locking groove 30 is firmly maintained. The lock piece 14 is engaged with the reduced diameter portion 22 of the connecting pin 10 on the entire circumference except for the notch portion 14A of 30 degrees when the bifurcated portion 32 is returned to its original position due to elasticity. Is not disengaged, and the adjacent link 16 is maintained in the connected state by the connecting pin 10. FIG. 5 shows a state in which the connection of the adjacent link 16 is completed by the connection pin 10.

  As can be seen from FIGS. 1 and 5, in the state where one link 16 is connected to the adjacent link 16 by the connecting pin 10, a gap S is formed between the pair of plate-like portions 38 of the one link 16. In this embodiment, S is opened up and down, and the tooth portion of the wheel that drives the chain extends in this gap S as will be described later. If the engagement of the tooth part between the plate-like parts 38 is possible from the engagement function with the tooth part of the wheel, which will be described later, the upper surface of the gap S may be closed. FIG. 6 is a side view of one link 16. The bottom surface of the plate-like portion 38 is provided with a notch 50 between the connecting pin insertion hole 42 and the barrel 44, and the notch 50 is used to drive the chain drive wheel of the present invention. It is an engaging part of a pin. The notch 50 has a substantially inverted V-groove shape with a relatively steep front surface and a loose rear surface, and the bottom surface 38A of the plate-like portion 38 before and after the notch 50 has a somewhat concave surface. When the driven wheel in the chain transmission system is a sheave wheel, the bottom surface 38A of the plate-like portion 38 of the adjacent link smoothly follows the shape of the peripheral surface of the sheave wheel when the chain is wound around the peripheral surface of the sheave wheel. Presents a concave shape.

  7 to 9 show the chain transmission wheel 52 of the present invention, which is used on the drive side in the chain transmission. The chain transmission wheel or assembly 52 sequentially or simultaneously performs transmission by teeth in a conventional sprocket chain transmission and transmission by a drive pin in a notch chain transmission. That is, in the chain transmission device wheel 52, as shown in FIG. 8, the disc-shaped support body 54 has a rotating shaft 56 inserted into the central hub portion 54-1, and the supporting body 54 and the rotating shaft 56 are keyed or the like. It is fixed by appropriate means. On both sides of the support body 54, annular drive pin support plates 57, 58 are arranged concentrically with the rotating shaft 56. An annular sprocket disk 60 is positioned adjacent to the support main body 54, and the sprocket disk 60 includes tooth parts (sprocket parts) 60A arranged at equal intervals in the circumferential direction at a pitch equal to the link pitch of the chain. . The drive pins 62 are arranged at equal intervals in the circumferential direction at a pitch equal to the chain link pitch on the inner side of the tooth portion 60A, and the drive pins 62 are inserted through the sprocket disk 60 at the intermediate portion and have outer diameters at both ends thereof. The screw portion 62-1 is reduced, and the screw portion 62-1 projects outward from the shaft on both sides from the openings formed in the drive pin support plates 57 and 58. The bolt 66 has a spacer 64 interposed between the drive pin support plate 58 and the sprocket disk 60, and a spacer 63 interposed between the support body 54 and the drive pin support plate 57, respectively. 58, the sprocket disk 60, the support body 54 and the drive pin support plate 57 are inserted in this order, and a nut 68 is screwed onto the end of the bolt 66 protruding from the drive pin support plate 57. Further, as a wheel that can be used on the drive side in the chain transmission device including the chain shown in FIGS. 1 to 6, the nut 70 is screwed and fastened to the screw portion 62-1 protruding from the drive pin support plates 57 and 58. Assembled.

  The wheel of the present invention can be used as a drive-side wheel in a chain transmission system composed of the chain of FIGS. 1 to 6, and when the chain goes around the wheel in the rotational direction a of the wheel in FIG. The tooth portion 60A of 60 enters the clearance S between the pair of plate-like portions 38 in the link 16 constituting the chain, and the tooth portion 60A engages with the barrel 44 at the front edge 60A-1 in the rotational direction (see also FIG. 9). ). In addition to the engagement of the tooth portion 60A with the barrel 44, the drive pin 62 engages with the notch 50 on the bottom surface of the pair of plate-like portions 38 in the link 16 constituting the chain. The engagement between the tooth portion 60A and the barrel 44 and the engagement between the drive pin 62 and the notch 50 occur sequentially or simultaneously to transmit power from the wheel to the chain. Although it is not necessary to install a chain guard, reliable power can be achieved.

  The driven side of the chain transmission system may be a normal sprocket or a sheave wheel. In the case of a normal sprocket, the teeth on the outer periphery of the sprocket enter the gap S between the pair of plate-like portions 38 in the link 16 constituting the chain and engage with the barrel 44. Further, in the case of a sheave wheel, when the chain goes around the sheave wheel, the connection of the concave surfaces of the bottom surfaces 38A of the pair of plate-like portions 38 constituting the link of the chain is in contact with the outer periphery of the sheave wheel so as to follow this, Smooth movement of the chain is obtained.

10 ... Connecting pin 16 ... Link 38 ... Plate-shaped part
40, 42 ... connecting pin insertion hole 38 ... plate-like portion 38A ... bottom surface 44 of link ... barrel 50 ... notch 52 ... chain transmission wheel 54 ... support body 56 ... rotating shaft
57, 58 ... Drive pin support plate 60 ... Sprocket disc 60A ... Tooth portion 62 ... Drive pin

Claims (1)

A chain transmission wheel,
A support body fixed to the rotating shaft;
An annular sprocket disk fixed to the support body,
The sprocket disk forms teeth on the outer periphery at equal intervals in the circumferential direction at a pitch equal to the link pitch of the chain, and
A chain transmission provided with drive pins arranged on the sprocket disk at equal intervals in the circumferential direction at a pitch equal to the link pitch of the chain on the inner side of the tooth part, and each end projecting outward from the sprocket disk. Equipment wheel .

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