Chain coupling device

Abstract

To provide a roller chain coupling device capable of restricting mutual displacement of axial centers of a pair of sprockets to prevent noise generation and a decrease in durability.SOLUTION: A chain coupling device 10 has a pair of sprockets 50, 55, fitted to a pair of axially arranged bosses 20, 30, wound with a chain 40 to be connected, and a pair of fitting projection parts 62, 63 protruding axially from both side faces of a position restriction body 60 are fitted in axial holed 21, 31 of the pair of bosses 20, 30, respectively.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a chain coupling device.

Background Art

[0002] Conventionally, as a chain coupling device, for example, a two-row roller chain is wound between a pair of sprockets with bosses arranged substantially on the same axis, the two-row roller chain is meshed with the tooth portions of the pair of sprockets with bosses, and in a roller chain coupling device that transmits torque between the pair of sprockets with bosses, a low-friction coating is applied to the tooth portions of the sprockets with bosses, and an oil-free roller chain is used for the two-row roller chain (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the roller chain coupling device has problems in that noise is likely to occur and durability is low due to misalignment between a pair of sprockets with bosses and surface opening due to inclination between end faces of opposing bosses. In view of the above problems, an object of the present invention is to provide a chain coupling device that can regulate displacement between a pair of sprockets and prevent noise generation and deterioration of durability.

Means for Solving the Problems

[0005] The chain coupling device according to the present invention is configured to solve the above problems. In a chain coupling device in which a chain is wound around and connected to a pair of sprockets respectively attached to a pair of bosses arranged on the same axis, A pair of fitting protrusions projecting coaxially from both side surfaces of a position restricting body are respectively fitted into the shaft holes of the pair of bosses.

Effect of the Invention

[0006] According to the present invention, a position restricting body arranged between a pair of bosses restricts the positions of the bosses and the sprockets, thereby preventing misalignment of the rotation axis inserted through the sprockets and the bosses and preventing surface opening of the sprockets and the bosses, and preventing the generation of noise and deterioration of durability.

[0007] As an embodiment of the present invention, the outer diameters of the pair of fitting protrusions may be different. According to this embodiment, even for rotating shafts with different diameters, it is possible to prevent the generation of noise and deterioration of durability due to misalignment and surface opening.

[0008] As another embodiment of the present invention, a key groove may be formed along the axis on the inner peripheral surface of the shaft hole of the boss.

[0009] According to this embodiment, it is possible to prevent displacement and dropping of the key inserted into the key groove by the position restricting body. As a result, there is an effect of preventing rattling and dropping of the rotating shaft.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Best Mode for Carrying Out the Invention

[0011] An embodiment of the chain coupling device according to the present invention will be described with reference to the accompanying drawings of FIGS. 1 to 4. As shown in FIGS. 1 and 2, the chain coupling device 10 according to the present invention includes a pair of bosses 20 and 30 arranged on the same axis, a pair of sprockets 50 and 55 respectively fixed to the bosses 20 and 30, a position restricting body 60 respectively fitted into the opposing shaft holes 21 and 31 of the bosses 20 and 30, an endless two-row roller chain 40 wound around the tooth portions 51 and 56 of the sprockets 50 and 55, and a pair of covers 70 and 70 covering the two-row roller chain 40.

[0012] The bosses 20 and 30 have shaft holes 21 and 31 provided with key grooves 22 and 32 and screw holes 23 and 33 respectively, which are substantially arranged on the same axis. The bosses 20 and 30 have fitting protrusions 24 and 34 on their opposing end faces respectively. Further, the bosses 20 and 30 are formed with annular grooves 25 and 35 on their outer peripheral surfaces for engaging C-rings 71 and 71 described later.

[0013] The sprockets 50 and 55 are respectively fitted to the fitting protrusions 24 and 34 of the bosses 20 and 30 and integrated. And the sprockets 50 and 55 have arcuate tooth bottom surfaces, such as S tooth profile, U tooth profile, and ISO tooth profile of JIS B 1801-1997 for example. Note that the sprockets 50 and 55 do not necessarily have to be separate from the bosses 20 and 30, and of course, they may be manufactured from one material.

[0014] As shown in FIGS. 3 and 4, the position restricting body 60 has fitting protrusions 62 and 63 projecting on the same axis on both side surfaces of a disc-shaped position restricting main body 61. The gaps between the fitting protrusions 62, 63 and the shaft holes 21, 31 can be appropriately selected as needed. As the gap, it may be 3% to 6% of the inner diameter of the shaft holes 21, 31, preferably 4% to 5%. If it is less than 3%, a smooth adjustment function cannot be exerted. If it exceeds 6%, the play becomes too large and problems such as noise start to occur. For example, if the inner diameter of the shaft holes 21, 31 is 20 mm, the outer diameter of the fitting protrusions 62, 63 may be 18 mm, and the gap may be 5%. Also, the protruding dimension of the fitting protrusions 62, 63 (the amount of intrusion into the shaft holes 21, 31) is 8% to 12% of the inner diameter, and particularly, around 10% is preferable. If it is less than 8%, the fitting protrusions 62, 63 are too short and tend to tilt, and the tip edge portions of the fitting protrusions 62, 63 are likely to contact the inner surface of the shaft holes 21, 31. If it exceeds 12%, with a slight tilt of the position regulating body 60, the tip edge portions of the fitting protrusions 62, 63 contact and rub against the inner peripheral surface of the shaft holes 21, 31, so that a smooth adjustment function cannot be exerted.

[0015] The double-row roller chain 40 is meshed and wound around the tooth portions 51, 56 of the sprockets 50, 55 arranged side by side. Then, the rotational force loaded on one sprocket 50 is transmitted to the other sprocket 55. In addition, the materials of each part of the chain can be selected as needed. For example, the roller may be formed of a lubricating resin material made of polytetrafluoroethylene that is more easily elastically deformed than steel, and the other parts may be formed of steel.

[0016] The covers 70, 70 each have a substantially U-shaped cross-section that can be inserted into the bosses 20, 30. Then, the covers 70, 70 are prevented from coming off by engaging C-rings 71, 71, which are stoppers, with the annular grooves 25, 35 provided on the outer peripheral surfaces of the bosses 20, 30.

[0017] Then, one end of a rotating shaft (not shown) is inserted into the shaft hole 21 of one boss 20, and a key (not shown) is driven into the keyway 22 to prevent relative rotation. Then, the other end of the rotating shaft (not shown) is inserted into the shaft hole 31 of the other boss 30, and a key (not shown) is driven into the keyway 32 to prevent relative rotation. Further, the fitting protrusions 62 and 63 of the position regulating member 60 are respectively fitted into the shaft holes 21 and 31 of the opposing bosses 20 and 30. Next, the axles of the sprockets 50 and 55 are arranged substantially on the same straight line. Finally, the assembly operation is completed by winding and connecting a double-row roller chain 40 around the tooth portions 51 and 56 of the juxtaposed sprockets 50 and 55.

[0018] According to the present embodiment, the position regulating member 60 is disposed between the one boss 20 and the other boss 30. For this reason, it is difficult for the key for preventing the rotation shaft from coming off to deviate from the keyways 22 and 32, and it is difficult for the key to fall off. As a result, displacement and dropping of the rotation shaft can be prevented, and occurrence of vibration, failure, and the like can be more effectively prevented.

[0019] Therefore, when one rotating shaft rotates, the boss 20 and the sprocket 50 transmit a rotational force to the sprocket 55 and the boss 30 via the double-row roller chain 40, and the other rotating shaft rotates. And when axial misalignment or face separation may occur between the axis of one rotating shaft and the axis of the other rotating shaft due to an external force. However, even in such a case, the position regulating member 60 can regulate the misalignment and face separation of the axes of the bosses 20 and 30. For this reason, there is an advantage that noise generated in the conventional chain sprocket device can be reduced and durability can be improved.

Industrial Applicability

[0020] The chain coupling device according to the present invention is not limited to the above-described embodiment, and can of course be modified as necessary.

Explanation of Reference Numerals

[0021] 10 Chain coupling device 20 Boss 21 Shaft hole 22 Key groove 23 Thread hole 24 Fitting protrusion 25 Annular groove 30 Boss 31 Axial hole 32 Key groove 33 Thread hole 34 Fitting protrusion 35 Annular groove 40 Double-row roller chain 41 Outer plate 42 Inner plate 43 Intermediate plate 44 Roller 45 Connecting pin 46 Bush 50 Sprocket 51 Tooth part 52 Fitting hole 55 Sprocket 56 Tooth part 57 Fitting hole 60 Position regulating body 61 Position regulating main body 62 Fitting protrusion 63 Fitting protrusion

Claims

1. A chain coupling device in which a chain is wound around and connected to a pair of sprockets respectively attached to a pair of bosses arranged on the same axis. A chain coupling device, characterized in that a pair of fitting protrusions projecting coaxially from both side surfaces of a position regulating body are respectively fitted into the axial holes of the pair of bosses.

2. The chain coupling device according to claim 1, characterized in that the outer diameters of the pair of fitting protrusions are different.

3. The chain coupling device according to claim 1 or 2, characterized in that a key groove is formed along the axis on the inner peripheral surface of the axial hole of the boss.

Images