JP2013241970A - Shaft connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable use at high-speed rotation by reducing vibration and noise as much as possible during rotation while maintaining a good rotational balance.SOLUTION: A shaft connecting device 1 for connecting two rotary shafts on one axis includes: a fastening sleeve 13 having shaft holes 13a, into which the two rotary shafts are inserted, and tapered surfaces 13c and 13d arranged on the outer peripheral surfaces of axial positions corresponding to the respective rotary shafts; two fastening rings 11 and 12 having tapered inner peripheral surfaces contacting the respective tapered surfaces; and a plurality of bolts 14 arranged in parallel to the axis in order to fasten the two fastening rings in a direction closer to each other. One fastening ring 11 includes a first flange part 11b having a cylindrical outer peripheral surface and a cylindrical inner peripheral surface 11g fitted in the outer peripheral surface of the other fastening ring 12. The other fastening ring 12 is housed in the inner peripheral surface of the first flange part 11b in an axial direction.

Description

  The present invention relates to a shaft coupling device that couples two rotating shafts on one axis.

  In general, two rotating shafts, for example, a driving shaft of a motor and a driven shaft that receives a driving force thereby are connected by a shaft connecting device, whereby the rotational driving force is transmitted.

  The shaft coupling device (coupling) includes a key method, a pin method, a spline method, a pressure fit method, and a tapering method, depending on the method of coupling with the rotating shaft in the rotational direction. These methods are selected according to the torque transmission capability, the rotational speed, the characteristics of the rotating shaft, the possibility of movement in the axial direction, the ease of attachment / detachment, and the like required for the shaft coupling device.

  Among these methods, in the tapering method, the inner sleeve is contracted by using the tapered surface to strongly grip the rotating shaft, and connected by the frictional force between the inner peripheral surface of the sleeve and the outer peripheral surface of the rotating shaft. Is done.

  Conventionally, as a tapering type shaft coupling device, for example, an inner ring having a shaft hole into which two rotating shafts are inserted and tapered surfaces provided at both axial ends of the outer peripheral surface, and a taper in contact with each tapered surface. There has been proposed a pair of outer rings having holes and bolts that are tightened in the axial direction so that the pair of outer rings are connected and brought close to each other (Patent Document 1).

  The shaft coupling device disclosed in Patent Document 1 can be configured in a small size with a relatively simple structure without processing the rotating shaft.

JP 2011-252599 A

  However, the above-described shaft coupling device of Patent Document 1 has problems with vibration and noise generated by rotation.

  That is, what is most concerned as a physical phenomenon in the rotating body is the balance (vibration, etc.) of the rotating body and noise generated by the rotation.

  In the shaft coupling device of Patent Document 1, since the bolt head protrudes outward in the axial direction of the outer ring, air is agitated by the bolt head during rotation, causing vibration and noise. Further, since there is a gap between the pair of outer rings and the bolt is inserted through the gap in an exposed state, the air is also stirred by this portion, which causes vibration and noise.

  Further, in the shaft coupling device of Patent Document 1, it is difficult to uniformly tighten a plurality of bolts in the process of tightening the bolts with a wrench and pulling the pair of outer rings together. For this reason, an error occurs in the parallelism of the two outer rings, and there is a possibility that the axial centers of these outer rings are deviated from the axis of the inner ring.

  In such a case, the rotation balance of the shaft coupling device is deteriorated, and rotation primary vibration and rotation n-order vibration are likely to occur. Therefore, vibration and noise tend to increase as the rotation speed increases. For this reason, the upper limit of the rotational speed cannot be increased, and there is a problem that it is difficult to use at a high rotational speed of about 10,000 RPM, for example.

  The present invention has been made in view of the above-mentioned problems, and provides a shaft coupling device that can be used at high speed rotation while maintaining a good rotation balance and minimizing vibration and noise during rotation. With the goal.

  The shaft coupling device according to the embodiment of the present invention is a shaft coupling device that couples two rotating shafts on one axis, and corresponds to the shaft hole into which the two rotating shafts are inserted and the respective rotating shafts. A fastening sleeve having a tapered surface provided on an outer peripheral surface in an axial position, two fastening rings having tapered inner peripheral surfaces in contact with the respective tapered surfaces, and fastening the two fastening rings in a direction approaching each other. A plurality of bolts provided in parallel with the axis, and one of the tightening rings has a cylindrical outer peripheral surface and a cylindrical inner peripheral surface that fits to the outer peripheral surface of the other tightening ring. The other fastening ring is housed in the inner peripheral surface of the first collar in the axial direction.

  According to the present invention, it is possible to maintain a good rotation balance, reduce vibration and noise during rotation as much as possible, and enable use at high speed rotation.

It is a front sectional view of the shaft coupling device concerning this embodiment. It is a left view of a shaft coupling device. It is a right view of a shaft coupling device. It is a back sectional view of a shaft connecting device. It is a perspective view of a shaft coupling device. FIG. 6 is a left side view of the shaft coupling device with a cover removed. It is a perspective part of one clamping ring. It is front sectional drawing which expands and shows a part of cover. It is a figure which shows the state which looked at the cover from the back surface.

[Features of shaft coupling device]
A feature of the shaft coupling device according to the present embodiment is a shaft coupling device that couples two rotating shafts on one axis, and a shaft hole into which the two rotating shafts are inserted and an axis corresponding to each rotating shaft. A tightening sleeve having a tapered surface provided on the outer peripheral surface of the directional position, two tightening rings having a tapered inner peripheral surface in contact with each tapered surface, and an axis for tightening the two tightening rings in a direction approaching each other; A plurality of bolts provided in parallel, wherein one tightening ring has a cylindrical outer peripheral surface and a cylindrical inner peripheral surface fitted to the outer peripheral surface of the other tightening ring. A collar portion is provided, and the other fastening ring is accommodated in the inner peripheral surface of the first collar portion in the axial direction.

  Preferably, the one tightening ring is provided with a second flange portion having a cylindrical outer peripheral surface and covering the head portion of the bolt in the axial direction.

  In addition, a ring-shaped cover that covers the head of the bolt in the radial direction of a circle centered on the axis is attached to the end face of the second flange.

  The cover has the same outer diameter as that of the second collar part, and is provided with a countersunk screw that is screwed into a plurality of axial screw holes provided along the circumferential direction of the second collar part. It is attached to 2 buttocks.

  In addition, one tightening ring is provided with an insertion hole for inserting a bolt along the circumferential direction, and the other tightening ring has a screw hole to be screwed with the bolt at a position corresponding to each insertion hole. A counterbore part into which a part of the head of each bolt enters is provided in the second collar part.

  The cover is provided with a recess at a position corresponding to the head of each bolt. The screw holes and counterbore provided in the second collar are alternately provided along the circumferential direction. The outer peripheral surface of the first collar part and the outer peripheral surface of the second collar part are flush with each other. The fastening sleeve is cut along the axial direction at one place in the circumferential direction.

Hereinafter, a shaft coupling device 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view taken along line AA in FIG. 2, and FIG. 4 is a cross-sectional view taken along line BB in FIG.
[Configuration of the shaft coupling device 1 of the embodiment]
As shown in FIGS. 1 to 5, the shaft coupling device 1 includes tightening rings 11 and 12, a tightening sleeve 13, a bolt 14, a cover 15, and the like.

  The fastening sleeve 13 is made of a metal material such as iron or stainless steel, is formed in a substantially cylindrical shape, and is provided with a slit 13e by being cut along the direction of the axis line JS at one place in the circumferential direction.

  In addition, what is necessary is just to make it the space | interval of the slit 13e become from several hundredths of mm to sufficient several mm after clamping, for example.

  The fastening sleeve 13 includes a shaft hole 13a into which the two rotary shafts KJ1 and KJ2 are inserted from the left and right, and two tapered surfaces 13c provided on the outer peripheral surface at the axial position corresponding to the respective rotary shafts KJ1 and KJ2. 13d.

  In the present embodiment, the shaft hole 13a has one inner peripheral surface 13b having the same diameter. This is because the outer diameters of the rotary shafts KJ1 and KJ2 are the same, and when the outer diameters of the rotary shafts KJ1 and KJ2 are different from each other, for example, two inner peripheries having inner diameters matching the respective outer diameters. What is necessary is just to provide a level | step difference so that it may have a surface.

  Note that the axis (center axis) JS of the two rotation axes KJ1, 2 coincides with each other, and the center axis of the shaft hole 13a also coincides with the axis JS of the rotation axes KJ1, 2. That is, the rotation axes KJ1 and 2 and the axis line JS of the shaft hole 13a are common.

  In addition, what is necessary is just to make the clearance between the internal peripheral surface 13b and the rotating shafts KJ1 and 2 into the range of about 0 to 8/100 mm by an initial value.

  Each of the tapered surfaces 13c and 13d is a conical surface and has an appropriate inclination angle α with respect to the axis line JS. In the present embodiment, the two tapered surfaces 13c and 13d are inclined in opposite directions and have the same inclination angle α. The magnitude of the inclination angle α is, for example, about 15 degrees.

  The fastening rings 11 and 12 are each made of a metal material such as iron or stainless steel, and are formed in a ring shape.

  Referring also to FIGS. 6 and 7, one tightening ring 11 has a ring body 11a and flanges 11b and 11c.

  The ring main body 11 a is provided with a tapered inner peripheral surface 11 f that contacts the tapered surface 13 c of the fastening sleeve 13. The tapered inner peripheral surface 11f is a conical surface having the same inclination angle α as the tapered surface 13c. The minimum inner diameter of the ring main body 11 a is slightly larger than the diameter of the inner peripheral surface 13 b of the fastening sleeve 13.

  The ring main body 11a is provided with a plurality of insertion holes 11d for inserting the bolts 14 along the circumferential direction. In the present embodiment, ten insertion holes 11d are provided at equal intervals on the circumference of a predetermined radius.

  The flange portion (first flange portion) 11 b has a cylindrical outer peripheral surface and a cylindrical inner peripheral surface 11 g fitted to the outer peripheral surface 12 a of the other fastening ring 12. The other fastening ring 12 is accommodated in the inner peripheral surface 11g of the flange portion 11b in the direction of the axis line JS.

  In other words, in the present embodiment, the entire outer peripheral surface 12a of the other tightening ring 12 is in contact with the inner peripheral surface 11g of the flange portion 11b, and the other tightening ring 12 is entirely connected to the flange portion 11b. It is stored in a space formed inside the inner peripheral surface 11g.

  In this embodiment, the flange portion 11b extends outward in the axial direction rather than the tightening ring 12. However, these outer end faces are in the same position in the axial direction, that is, are flush with each other. You may do it.

  The flange portion (second flange portion) 11c has an outer peripheral surface that is flush with the outer peripheral surface of the flange portion 11b, and covers the head of the bolt 14 in the direction of the axis line JS. That is, in the present embodiment, the head of the bolt 14 is housed in a space formed entirely inside the flange portion 11c.

  The flange portion 11c is provided with a counterbore portion 21 into which a part of the head of each bolt 14 enters. The bottom face of the counterbore part 21 is flush with the surface (side face) of the ring main body 11a. Therefore, the bolt 14 has a part of each head that enters the counterbore part 21, and the bottom face of the counterbore part 21 and the ring main body It is in contact with the surface of 11a.

  The diameter of the counterbore 21 is such that a tool such as a socket wrench or a spanner for rotating the bolt 14 can be engaged with the head.

  The flange portion 11c is provided with a plurality of screw holes 11e along the circumferential direction for attaching the cover 15. In the present embodiment, ten screw holes 11e are provided at equal intervals on the circumference of a predetermined radius. These screw holes 11e and counterbore portions 21 are provided alternately along the circumferential direction.

  Thus, the counterbore part 21 is provided in the collar part 11c, and the screw hole 11e is provided between the counterbore part 21 and the counterbore part 21, so that the outer diameter of the tightening ring 11 can be reduced and the size can be reduced. Can be planned.

  The other tightening ring 12 has a cylindrical outer peripheral surface 12 a fitted to the inner peripheral surface 11 g of the flange portion 11 b and a tapered inner peripheral surface 12 b in contact with the tapered surface 13 d of the tightening sleeve 13. The tapered inner peripheral surface 12b is a conical surface having the same inclination angle α as the tapered surface 13d. The minimum inner diameter of the tightening ring 12 is the same as the minimum inner diameter of the tightening ring 11 and is slightly larger than the diameter of the inner peripheral surface 13 b of the tightening sleeve 13.

  The tightening ring 12 is provided with screw holes 12 c at positions corresponding to the insertion holes 11 d provided in the tightening ring 11. In the present embodiment, the screw hole 12c penetrates the fastening ring 12 in the direction of the axis JS, but may be formed so as not to penetrate. Further, an appropriate bolt or the like may be screwed into the penetrating screw hole 12c to fill the hole.

  The bolt 14 is for tightening the two tightening rings 11 and 12 in a direction approaching each other, and is inserted into the insertion hole 11d and screwed into the screw hole 12c.

  In the present embodiment, the bolt 14 is a hexagon bolt. Since the hexagon bolt has a short axial length of the head, the length of the protrusion from the surface of the ring main body 11a can be reduced. Therefore, the axial length of the flange portion 11c can be suppressed to be small and lightweight. it can. However, as the bolt 14, a hexagon socket head bolt or another bolt may be used.

  Further, an insertion hole may be provided instead of the screw hole 12c, and the bolt 14 may be tightened using a nut. In that case, you may provide the recessed part for a nut to fit in the outer surface of the clamping ring 12. FIG.

  The cover 15 is made of a metal material such as iron, stainless steel, or an aluminum alloy, or a synthetic resin material, and is formed in a substantially circular ring shape.

  8 and 9, the cover 15 has a cover body 15a and a fitting portion 15b.

  The cover body 15a has the same outer diameter as the outer diameter of the flange portion 11c. Further, the inner diameter is the same as the minimum inner diameter of the tightening ring 11. The cover main body 15a is provided with a countersunk hole 15c for fitting the head of the countersunk screw 16 into each position corresponding to the screw hole 11e provided in the flange 11c.

  The fitting portion 15b is substantially the same as the diameter of the inner peripheral surface of the flange portion 11c, that is, the minimum inner diameter of the flange portion 11c, and has an outer diameter having a fitting tolerance. The clearance for this fitting may be about a few hundredths of a millimeter, for example.

  Moreover, the recessed part 31 is provided in the fitting part 15b in the position corresponding to the head of each bolt 14. FIG. The bottom surface of the recess 31 is flush with the surface of the cover body 15a. When the axial length of the head of the bolt 14 is large, a part of the head of the bolt 14 can enter the recess 31.

  The cover 15 is attached to the end surface of the flange portion 11c with ten countersunk screws 16 screwed into the screw holes 11e in a state where the fitting portion 15b is fitted and positioned on the inner peripheral surface of the flange portion 11c. Thereby, the head of the bolt 14 is covered in the radial direction of the circle centered on the axis line JS.

  The outer surface of the head of the countersunk screw 16 is flush with the outer surface of the cover 15. Further, a putty or the like may be buried in the cross hole in the head of the countersunk screw 16.

The outer peripheral surface 12a of the tightening ring 12, the inner peripheral surface 11g of the flange portion 11b, the tapered inner peripheral surfaces 11f and 12b of the tightening rings 11 and 12, the tapered surfaces 13c and 13d of the tightening sleeve 13, the inner peripheral surface 13b, etc. What is necessary is just to make the surface roughness precise so that the parallelism or roundness of each part becomes high accuracy. For example, the RZ surface roughness may be about 1 to several μm.
[Operation of shaft coupling device 1]
Next, the operation of the shaft coupling device 1 described above will be described.

  When the shaft coupling device 1 is attached to the rotary shafts KJ1 and KJ2, the rotary shafts KJ1 and KJ2 are inserted into the shaft holes 13a of the tightening sleeve 13 from the left and right, and the ten bolts 14 are slightly inserted in order with the cover 15 removed. Tighten by 10 bolts 14 as uniformly as possible. At this time, the bolts 14 on the diagonal line may be tightened as a set. It is preferable to use a socket wrench with a torque management device or a torque measuring device as a tool for tightening.

  As a result, the tightening rings 11 and 12 come close to each other and press the tightening sleeve 13 toward the axis JS by the respective taper inner peripheral surfaces 11f and 12b. As a result, the diameter of the inner peripheral surface 13b of the tightening sleeve 13 is contracted and the rotary shafts KJ1 and 2 are strongly gripped, and the connection is performed by the frictional force therebetween.

  When the tightening rings 11 and 12 are fastened to each other by the bolt 14, the outer peripheral surface 12a of the tightening ring 12 is fitted to the inner peripheral surface 11g of the flange portion 11b. Therefore, the parallelism of the tightening rings 11 and 12 with respect to the axis JS Is accurately maintained, and the axial centers of the tightening rings 11 and 12 do not deviate from the axis line JS.

  Therefore, in the shaft coupling device 1 of the present embodiment, it is possible to maintain a good balance of rotation and reduce vibration and noise during rotation as much as possible, and to enable use at high speed rotation.

  Further, in the shaft coupling device 1 of the present embodiment, the head of the bolt 14 is covered with the flange portion 11b in the axial direction and does not protrude in the axial direction. The head of the bolt 14 does not disturb or disturb the airflow, and noise and air resistance can be greatly reduced.

  In addition, even in the shaft portion of the bolt 14 that is inserted between the tightening ring 11 and the tightening ring 12 in an exposed state, this is covered with the flange portion 11b, so that noise and air resistance are not caused.

  Further, the cover 15 is positioned by fitting the fitting portion 15b into the inner peripheral surface of the flange portion 11c, and the shaft center of the cover 15 is not displaced during rotation, and a good weight balance is maintained.

  Further, since the moment of inertia is almost perfectly balanced in the circumferential direction, the shaft coupling device 1 can greatly reduce vibration and noise when rotated, for example, high speed rotation of about 10,000 RPM or more, and 20000 RPM. It can be adapted to high speed rotations of the degree or more.

  In this regard, in the conventional shaft coupling device, the head of the bolt protrudes and the weight balance is not sufficiently adjusted, which causes vibration and noise.

  Thus, the shaft coupling device 1 of the present embodiment can significantly reduce vibration and noise due to rotation over a wide range from low speed rotation to high speed rotation.

  In the embodiment described above, the recess 31 provided in the fitting portion 15b can be omitted.

  In addition, the configuration, structure, shape, dimensions, number, arrangement, material, and the like of each part or the whole of the tightening rings 11 and 12, the tightening sleeve 13, the bolt 14, the cover 15, the countersunk screw 16, or the shaft coupling device 1 are included in the present invention. It can be appropriately changed in accordance with the gist of

1 Axle coupling device 11 Tightening ring (One tightening ring)
12 Tightening ring (the other tightening ring)
13 Tightening sleeve 14 Bolt 15 Cover 16 Countersunk screw 11a Ring main body 11b Eave part (first eave part)
11c buttock (second buttock)
11f Inner peripheral surface 11g Inner peripheral surface 12a Outer peripheral surface 12b Inner peripheral surface 13a Shaft hole 13c, 13d Tapered surface KJ1, Rotary axis JS Axis

Claims (9)

A shaft coupling device for coupling two rotating shafts on one axis,
A tightening sleeve having a shaft hole into which the two rotating shafts are inserted and a tapered surface provided on an outer peripheral surface at an axial position corresponding to each rotating shaft;
Two clamping rings having tapered inner peripheral surfaces in contact with the respective tapered surfaces;
A plurality of bolts provided in parallel to the axis for tightening the two clamping rings in a direction approaching each other;
One of the tightening rings is provided with a first flange portion having a cylindrical outer peripheral surface and a cylindrical inner peripheral surface that is fitted to the outer peripheral surface of the other tightening ring,
The other tightening ring is housed in the inner peripheral surface of the first flange in the axial direction.
A shaft coupling device. One of the tightening rings has a cylindrical outer peripheral surface, and is provided with a second flange portion that covers the head of the bolt in the axial direction.
The shaft coupling device according to claim 1. A ring-shaped cover that covers the head of the bolt in the radial direction of a circle centered on the axis is attached to the end surface of the second flange portion.
The shaft coupling device according to claim 2. The cover has an outer diameter that is the same as the outer diameter of the second collar portion, and a countersunk screw that is screwed into a plurality of axial screw holes provided along the circumferential direction of the second collar portion. Attached to the second collar,
The shaft coupling device according to claim 3. One tightening ring is provided with an insertion hole for inserting the bolt along the circumferential direction.
The other tightening ring is provided with screw holes to be screwed into the bolts at positions corresponding to the respective insertion holes,
The second collar portion is provided with a counterbore portion into which a part of the head of each bolt enters.
The shaft coupling device according to claim 4. The cover is provided with a recess at a position corresponding to the head of each bolt.
The shaft coupling device according to claim 5. The screw holes and the counterbore provided in the second flange are alternately provided along the circumferential direction.
The shaft coupling device according to claim 5 or 6. The outer peripheral surface of the first collar part and the outer peripheral surface of the second collar part are flush with each other,
The shaft coupling device according to any one of claims 2 to 7. The fastening sleeve is cut along the axial direction at one place in the circumferential direction.
The shaft coupling device according to any one of claims 1 to 8.

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