JP5478529B2 - Shaft coupling - Google Patents

Description

  The present invention relates to a shaft coupling, and more particularly to a shaft coupling that connects two rotating shafts on the same axis by a clamp hub member fitted on the outer periphery of the rotating shaft.

  As a shaft coupling for connecting two rotating shafts on the same axis, there is known a coupling performed by a clamp hub member fitted on the outer periphery of the rotating shaft (for example, Patent Documents 1 and 2).

  A clamp hub member used for this type of shaft coupling has a shaft insertion hole into which a rotating shaft to be connected is inserted, and a slit-shaped split groove extending in the hub radial direction. In a shaft coupling using a bolt, a fastening bolt is passed from a bolt through hole formed on one side of the split groove to a female screw hole formed on the other side of the split groove, and the fastening bolt is tightened into the female screw hole. Thus, the rotary shaft inserted into the shaft insertion hole and the clamp hub member are fastened by reducing the groove width of the split groove and reducing the diameter of the clamp hub member.

  In the above-described shaft coupling, in order to fasten the rotating shaft to the clamp hub member with high concentric accuracy, the “dimensional fit” with a small dimensional difference between the inner diameter of the shaft insertion hole and the outer diameter of the rotating shaft to be connected is used. You are required to be. However, the smaller the dimensional difference (fitting tolerance), the worse the workability of inserting the rotating shaft into the shaft insertion hole.

  On the other hand, when inserting the rotating shaft into the shaft insertion hole, the rotating shaft is inserted into the shaft while the groove width of the split groove is widened using a special jig and the clamp hub member is expanded and deformed. There is one that can be inserted into the hole, and the rotation shaft can be easily inserted into the shaft insertion hole even by “fitting fit” (for example, Patent Document 3).

JP 2005-273790 A JP 2007-232137 A JP 2009-68645 A

  However, the above-described shaft coupling requires a dedicated jig, and after inserting the rotary shaft into the shaft insertion hole, the dedicated jig must be removed from the clamp hub member, increasing the number of work steps.

  The problem to be solved by the present invention is that, in the shaft coupling by the clamp hub member, even if it is a “tight fit” fitting, the rotary shaft can be easily inserted into the shaft insertion hole without requiring a dedicated jig, It is to be able to do without increasing work man-hours by removing the dedicated jig.

  The shaft coupling according to the present invention includes a shaft insertion hole (12) into which a rotating shaft (100) to be connected is inserted, and a slit-shaped split groove (30) extending in the hub radial direction, (30) A shaft coupling (1) using a clamp hub member (10A, 10B) whose diameter is reduced by reducing the groove width, and the clamp hub member (10A, 10B) includes A first female screw hole (32) that opens into the split groove (30) from one side (30L), a diameter larger than the first female screw hole (32), and the first female screw hole (32) On the same axis, a second female screw hole (34) is formed from the other side (30R) of the split groove (30) to the split groove (30), and is formed in the first female screw hole (32). A first male screw member (36) engaged with the screw and the second female screw hole (34) A third second male screw member formed with female screw hole (42) in (40) and to said first male screw member (36) threaded engagement with threaded engagement.

  According to this configuration, the third female screw hole (42) of the second male screw member (40) engaged with the second female screw hole (34) is screwed into the first female screw hole (32). The front end of the engaged first male screw member (36) is screw-engaged, and the first male screw member (36) is fixed so as not to rotate, and the first female screw hole (42) is fixed to the first female screw hole (42). The second male screw member (40) is rotated in a direction in which the screwing amount of the male screw member (36) is increased, and the second male screw member (40) is screwed toward the split groove (30). Due to this screwing, the other side (30R) of the split groove (30) of the clamp hub member (10A, 10B) is elastically deformed in a direction opposite to the screwing direction of the second male screw member (40). The groove width of the split groove (30) is expanded, and the clamp hub members (10A, 10B) are deformed to expand. Accordingly, even if the fitting tolerance between the inner diameter of the shaft insertion hole (12) and the outer diameter of the rotation shaft (100) to be connected is small, the rotation shaft (100) is easily inserted into the shaft insertion hole (12). be able to.

  After the insertion of the rotary shaft (100) into the shaft insertion hole (12) is completed, when the rotary shaft (100) is fastened to the clamp hub member (10A, 10B), the first male screw member (36) is rotated. The second male screw member (40) is rotated in a direction in which the amount of screwing of the first male screw member (36) into the third female screw hole (42) is reduced. 40) is screwed to the side opposite to the side of the split groove (30). The above-described elastic deformation of the other side (30R) of the split groove (30) of the clamp hub member (10A, 10B) is eliminated by this screwing, and the groove width of the split groove (30) is restored to its original state. The member is no longer expanded in diameter, and the rotary shaft (100) is fixed to the clamp hub member (10A, 10B) by the force that the split groove (30) tries to shrink.

  By fixing the first male screw member (36) so as not to rotate, and further rotating the second male screw member (40) in the direction of screwing to the side opposite to the split groove (30) side, The other side (30R) of the split groove (30) of the clamp hub member (10A, 10B) is elastically deformed in a direction opposite to the screwing direction of the second male screw member (40). As a result, the groove width of the split groove (30) is narrowed, and the clamp hub members (10A, 10B) are deformed to reduce the diameter. As in the conventional shaft coupling, the rotary shaft (100) is clamped with the required clamping force ( 10A, 10B).

  In the shaft joint according to the present invention, preferably, the split groove includes a first split groove (50) extending in the hub radial direction from the shaft insertion hole (12) to the vicinity of the hub outer peripheral portion, and the first split groove. A second split groove (52) that is adjacent to the groove (50) in the circumferential direction and extends in the hub radial direction from the outer periphery of the hub to the vicinity of the shaft insertion hole (12).

  According to this configuration, the clamp hub member (10A, 10B) is connected to the closed loop by the intermediate piece portion (54) existing between the first split groove (50) and the second split groove (52). Since it has a shape, the shaft insertion hole when the groove width of both the first split groove (50) and the second split groove (52) is reduced and the clamp hub members (10A, 10B) are reduced in diameter. The degree of maintenance of the roundness of (12) is increased.

  According to the shaft coupling of the present invention, the amount of screwing of the first male screw member into the third female screw hole is increased or decreased by fixing the first male screw member so as not to rotate and rotating the second male screw member. Accordingly, the groove width of the split groove is enlarged and reduced, and the clamp hub member is deformed to expand and contract, so that the clamp hub member is expanded and deformed to insert the rotating shaft into the shaft insertion hole. Can be performed without the need for a dedicated jig, and there is no increase in work man-hours due to the removal of the dedicated jig.

The disassembled perspective view which shows one Embodiment of the shaft coupling by this invention. The assembly perspective view of the shaft coupling by this embodiment. Sectional drawing of the principal part of the shaft coupling by this embodiment (line III-III sectional drawing of FIG. 2). The assembly perspective view which shows other embodiment of the shaft coupling by this invention. Sectional drawing of the principal part of the shaft coupling by other embodiment (line VV sectional drawing of FIG. 4).

  One embodiment of a shaft coupling according to the present invention will be described with reference to FIGS.

  The shaft coupling 1 has two clamp hub members 10A and 10B. Since the clamp hub members 10A and 10B have the same structure (same parts), only the clamp hub member 10A on one side will be described here in order to avoid redundancy, and the clamp hub member 10B is the same as the clamp hub member 10A. The same reference numerals are given and the description is omitted.

  The clamp hub member 10A is made of metal and has a ring shape having a shaft insertion hole 12 into which the rotation shaft 100 to be connected is inserted at the center.

  Bolt through-holes 14 are formed in the clamp hub member 10A at two locations that are rotated and displaced 180 degrees around the central axis. The clamp hub member 10A is formed with female screw holes 16 at two locations that are rotated and displaced 90 degrees from the bolt through holes 14 around the central axis and rotated 180 degrees relative to each other.

  Although the lower hole of the female screw hole 16 is a through hole, the female screw hole 16 is screwed into the lower hole in order to avoid interference between a fastening bolt 18 and a first male screw member 36 described later. However, in the figure, for the purpose of clarifying the position of the female screw hole 16 provided in the clamp hub member 10A, the screw hole is formed over the entire length of the lower hole (through hole). As shown.

  The clamp hub members 10A and 10B are combined with a rotational phase rotated by 90 degrees with respect to each other. The clamp hub members 10A and 10B are passed through the bolt through holes 14 with the washer 20 and the plurality of leaf springs 22 interposed therebetween. Then, they are connected (coupled) to each other by fastening bolts 18 that are threadedly engaged with the female screw holes 16. The leaf spring 22 is formed with a central opening 24 for avoiding interference with the rotary shaft 100 and a bolt through hole 26 through which the screw shaft portion of the fastening bolt 18 passes. Accordingly, the clamp hub members 10A and 10B are connected to each other in a torque transmission relationship via the plurality of leaf springs 22.

  A slit-shaped split groove 30 extending in the hub radial direction is formed in the clamp hub member 10A. The split groove 30 is at a rotational position different from any of the bolt through hole 14 and the female screw hole 16, in this embodiment, at a rotational position close to the bolt through hole 26 as long as it does not interfere with the bolt through hole 26 on one side. From the insertion hole 12 to the outer periphery of the hub, it is provided over the entire area in the hub radial direction and over the entire axial width of the clamp hub member 10A.

  As described above, the clamp hub members 10A and 10B are combined with a rotation phase rotated by 90 degrees with each other, so that the split groove 30 of the clamp hub member 10A and the split groove 30 of the clamp hub member 10B are 90 degrees with respect to each other. In different rotational positions.

  The clamp hub member 10 </ b> A undergoes a diameter expansion deformation when the groove width of the split groove 30 is increased, and conversely, the clamp hub member 10 </ b> A undergoes a diameter reduction deformation by reducing the groove width of the split groove 30. Both the diameter expansion deformation and the diameter reduction deformation of the clamp hub member 10A are elastic deformations.

  The clamp hub member 10A includes a first female screw hole 32 that opens into the split groove 30 from one side (left side as viewed in FIG. 3) 30L (see FIG. 3) of the split groove 30 and a first female screw hole 32. A second female screw hole 34 having a large diameter and opening on the split groove 30 from the other side (right side in FIG. 3) 30R (see FIG. 3) of the split groove 30 on the same axis as the first female screw hole 32; Is formed.

  A first male screw member 36 having a hexagon wrench engaging hole 38 is screwed into the first female screw hole 32. A second male screw member 40 having a hexagon wrench engaging hole 44 is threadedly engaged with the second female screw hole 34. A third female screw hole 42 is formed at the center of the second male screw member 40, and a first male screw member 36 is screwed into the third female screw hole 42.

  When the rotary shaft 100 is inserted into the shaft insertion hole 12, a wrench (not shown) is engaged with the hexagon wrench engagement hole 38 and the first male screw member 36 is fixed by the wrench so as not to rotate. The second male screw member 40 is rotated in a direction in which the screwing amount of the first male screw member 36 into the third female screw hole 42 is increased, for example, in the clockwise direction, and the second male screw member 40 is moved to the split groove 30 side. It is screwed (left side as viewed in FIG. 3).

  By the screwing of the second male screw member 40, the other side 30R of the split groove 30 of the clamp hub member 10A is elastically deformed in the direction opposite to the screwing direction of the second male screw member 40, and the splitting is accompanied accordingly. The groove width of the groove 30 is expanded, and the clamp hub member 10A is expanded and deformed.

  Thus, even if the fitting tolerance between the inner diameter of the shaft insertion hole 12 and the outer diameter of the rotating shaft 100 to be connected is small to ensure high concentric accuracy, the rotating shaft 100 can be easily inserted into the shaft insertion hole 12. Can be inserted.

  After the rotation shaft 100 is inserted into the shaft insertion hole 12, when the rotation shaft 100 is fastened to the clamp hub member 10A, the first male screw member 36 is fixed so as not to rotate as in the case of the diameter expansion deformation. In this state, the second male screw member 40 is rotated in a direction in which the screwing amount of the first male screw member 36 with respect to the third female screw hole 42 is reduced, for example, counterclockwise, and the second male screw member 40 is rotated. Screw to the side opposite to the side of the split groove 30 (right side as viewed in FIG. 3).

  The above-described elastic deformation of the other side 30R of the split groove 30 of the clamp hub member 10A is canceled by the screwing of the second male screw member 40, and the groove width of the split groove 30 is restored. Thereby, the diameter expansion deformation | transformation of 10 A of clamp hub members is lose | eliminated, and the rotating shaft 100 is fixed to 10 A of clamp hub members by the force which the groove 30 tries to shrink.

  While the first male screw member 36 is fixed so as not to rotate, the second male screw member 40 is further rotated in the direction of screwing to the side opposite to the split groove 30 side (right side as viewed in FIG. 3). Then, the other side 30R of the split groove 30 of the clamp hub member 10A is elastically deformed in a direction opposite to the screwing direction of the second male screw member 40. As a result, the groove width of the split groove 30 is narrowed, the clamp hub member 10A is reduced in diameter, and the rotary shaft 100 is fastened to the clamp hub member 10A with a required tightening force as in the conventional case. The final fastening torque at this time may be managed with a regular tightening torque according to the strength of the first male screw member 36 so that the screw engagement is not broken.

  Thereby, in order to ensure high concentric accuracy, even if the fitting is a “tight fit” in which the dimensional difference between the inner diameter of the shaft insertion hole 12 and the outer diameter of the rotation shaft 100 is small, the rotation shaft 100 is inserted into the shaft insertion hole 12. Can be easily inserted without requiring a dedicated jig and without increasing the number of work steps by removing the dedicated jig. Since the clamp hub member 10A and the rotary shaft 100 can be fastened / released only by the screwing of the second male screw member 40, the workability of fastening / release of the clamp hub member 10A and the rotary shaft 100 can be achieved. Will also improve.

  In the fastening state in which the clamp hub member 10A is contracted in diameter, the tension in the pulling direction acts on the first male screw member 36, and the first male screw member 36 and the first female screw hole 32 are engaged with each other. In addition to the screw engagement between the second male screw member 40 and the second female screw hole 34, the screw engagement between the first male screw member 36 and the second male screw member 40 is not loosened.

  Next, another embodiment of the shaft coupling according to the present invention will be described with reference to FIGS. 4 and 5, parts corresponding to those in FIGS. 1 to 3 are denoted by the same reference numerals as those in FIGS. 1 to 3, and description thereof is omitted.

  This embodiment is different from the previous embodiment in the shape of a split groove, and other parts are substantially the same as those in the previous embodiment.

  In the present embodiment, the split groove is a first split groove 50 extending in the hub radial direction from the shaft insertion hole 12 to the vicinity of the hub outer peripheral portion, and is adjacent to the first split groove 50 in the circumferential direction. The second split groove 52 extends in the hub radial direction to the vicinity of the shaft insertion hole 12 and has an N shape when viewed from the axial direction.

  Although the space | interval dimension of the circumferential direction of the 1st split groove 50 and the 2nd split groove 52 is based also on the aperture of the shaft coupling 1, it may be about 2-5 mm. A through hole 56 through which the first male screw member 36 is inserted in a loosely fitted state is formed in the intermediate piece portion 54 existing between the first split groove 50 and the second split groove 52.

  According to this embodiment, the clamp hub member 10 </ b> A has a shape connected by a closed loop by the intermediate piece portion 54 existing between the first split groove 50 and the second split groove 52. The width of both the split groove 50 and the second split groove 52 is reduced, and the degree of maintenance of the roundness of the shaft insertion hole 12 when the clamp hub member 10A is deformed by a reduced diameter is increased.

  Thereby, coupled with the small fitting tolerance between the inner diameter of the shaft insertion hole 12 and the outer diameter of the rotating shaft 100, the rotating shaft 100 can be fastened to the clamp hub member 10A with higher concentric accuracy.

  The shape of the leaf spring 22 is not limited to a quadrangular shape, and may be another shape such as a hexagonal shape or a circular shape according to the torque transmission specifications of the shaft coupling 1. In the present embodiment, since the leaf spring 22 has a quadrangular shape, the rotational phase of the clamp hub members 10A and 10B is 90 degrees, and this rotational phase is 90 degrees according to the shape of the leaf spring 22. An angle other than that may be set.

DESCRIPTION OF SYMBOLS 1 Shaft coupling 10A, 10B Clamp hub member 18 Fastening bolt 22 Leaf spring 30 Split groove 32 1st female screw hole 34 2nd female screw hole 36 1st male screw member 40 2nd male screw member 42 3rd female screw hole

Claims (2)

A shaft using a clamp hub member which has a shaft insertion hole into which a rotation shaft to be connected is inserted and a slit-shaped split groove extending in the hub radial direction, and which is reduced in diameter by reducing the groove width of the split groove. A joint,
The clamp hub member includes a first female screw hole that opens into the split groove from one side of the split groove, a diameter larger than the first female screw hole, and the same axis as the first female screw hole. A second female screw hole that is open to the split groove from the other side of the split groove is formed;
A first male screw member that engages with the first female screw hole, and a third female screw hole that engages with the second female screw hole and the first male screw member are formed. A shaft coupling having a second male screw member. The split groove is
A first split groove extending in the hub radial direction from the shaft insertion hole to the vicinity of the outer periphery of the hub;
2. The shaft coupling according to claim 1, comprising a second split groove that is adjacent to the first split groove in the circumferential direction and extends in the hub radial direction from the outer peripheral portion of the hub to the vicinity of the shaft insertion hole. .

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