TW201706513A - Shaft connector keeping a clamping degree uniform even when a pair of clamping bolts is not locked - Google Patents

Abstract

Provided is a shaft connector, in which a clamping degree is maintained uniform even a pair of clamping bolts is not locked to each other. The shaft connector 10 comprises a shaft hole 28 and a clamping hub 24. The clamping hub 24 is configured with a pair of slits 23a, 23b facing an axial direction. Abutting members (gaskets) 32a, 32b are provided between the slits 23a, 23b. Tightening clamping bolts V causes the slits 23a, 23b to reduce and slit surfaces 25a, 25b, 27a, 27b of the clamping hub 24 respectively abut the abutting members (gaskets) 32a, 32b with a certain tightening degree, so as to achieve a certain tightening degree of the clamping bolts V.

Description

Shaft joint

The present invention relates to a shaft joint that connects a shaft to a shaft. More specifically, the present invention relates to a so-called double-clamping shaft joint having a clamping hub having two sets of slits for inserting a shaft into a shaft hole and an axial direction. The slit is inserted by a clamp bolt inserted perpendicularly to each slit to make the slit small, and the shaft inserted into the shaft hole is locked by the clamping of the hub portion, and the shaft joint is locked with the shaft.

a clamping type shaft joint having a clamping hub portion and a clamping bolt having a shaft hole for inserting a shaft and a slit in an axial direction, the clamping bolt being orthogonal to the slit Insertion, the shaft and the shaft joint can be locked with a small number of bolts, so that it is easy to assemble. In addition, since the clamping bolt is inserted in the direction orthogonal to the axial direction, the axial direction dimension of the shaft joint can be made larger than the bolt insertion in the axial direction to lock the shaft and the shaft joint. small. Examples of the clamp type shaft joint having such an advantage include those disclosed in Patent Documents 1 and 2.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-167743

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2005-133940

Patent Document 1 discloses a shaft joint having a clamping hub having a set of slits for inserting a shaft hole into a shaft hole and an axial direction. In the case of such a so-called single-clamp type shaft joint, when the shaft joint is locked to one of the shafts, it is sufficient to lock one of the clamp bolts, so assembly is easy. However, the single-clamp type shaft joint is such that the clamp bolt exists only in one of the radial directions, and the bolt hole for the clamp bolt is also provided, so that the center of gravity of the shaft joint is deviated from the axial center. In addition, if the shaft is inserted into the shaft hole of the shaft joint, the clamping bolt is locked, and although the gap between the clamping hub and the shaft is gradually narrowed, the clamping hub portion is closely attached to the shaft, but in the case of single clamping type Because the clamping bolt of one place is locked, the shaft is approached in one direction of the shaft hole, so the axis of the shaft and the position of the rotating shaft of the shaft joint are also deviated. Therefore, if the shaft rotates at a high speed, there is a problem that vibration occurs under the influence of the centrifugal force.

On the other hand, Patent Document 2 discloses a shaft joint having a pair of clamping hub portions having two sets of slits for inserting a shaft hole into a shaft hole and an axial direction. In the case of such a double-clamp type shaft joint, the clamp bolt is usually disposed at a position where the radial direction is symmetrical, so that the center of gravity of the shaft joint with respect to the shaft center is less likely to deviate than the single-clamp type shaft joint. However, if the degree of locking of the pair of clamping bolts is different, deformation occurs in the clamping hub portion, so that the center of gravity of the shaft joint with respect to the shaft center is still deviated. In order to solve the above problems, in order to make the locking of the pair of clamping bolts uniform, the method of using the dial indicating gauge to lock the pair of clamping bolts a little is performed on the spot, but the operation is performed. It's not easy, it's a matter of time. In addition, it is also necessary to provide a space for the dial indicating gauge, and therefore it is difficult to select a double-clamp type shaft joint as a problem of being attached to a shaft joint in a narrow place where the space cannot be secured.

In view of the above problems, the present invention has been made in view of the problems of the foregoing prior art to provide a shaft joint whose uniform degree of clamping is uniform even if a pair of clamp bolts are not interlocked.

The present invention solves the aforementioned problems by the following shaft joint: a shaft joint having a clamp hub portion and a clamp bolt provided at a position symmetrical with respect to a shaft aperture direction on the inner diameter side toward the axial direction The pair of slits are inserted into the sandwiching hub portion in a direction orthogonal to the pair of slits, respectively, and an abutting member is provided between the pair of slits.

According to the present invention, when the clamp bolt is locked, the slit surface of the clamp bolt contacts the abutting member with a predetermined degree of locking. At this time, since the clamping bolt cannot be further locked, the clamping bolt is locked. The degree becomes continuous and uniform. Therefore, there is no need to interlock the pair of clamping bolts. Therefore, the time for assembling the shaft joint can be shortened compared to the prior art. In addition, since it is not necessary to use the dial indicating gauge, there is no need to ensure the installation space of the dial indicating gauge. Therefore, even in the case of a double-clamp type shaft joint, the shaft joint of the present invention can be used as a shaft joint installed in a narrow space.

As the abutting member of the present invention, a conventional double-clamping shaft joint can be used as the shaft joint of the present invention as long as the annular gasket inserted by the clamp bolt is used.

On the other hand, the protrusion provided on the slit surface of the holding hub portion may be used as the abutting member. Thereby, it is possible to omit the trouble of passing the spacer through the bolt when the abutting member is an annular gasket, so that the assembly work of the shaft joint can be made simpler.

10‧‧‧ shaft joint

23a, 23b‧‧‧ slit

24‧‧‧Clamping hub

25a, 25b, 27a, 27b‧‧‧ slit face

28‧‧‧Axis hole

32a, 32b‧‧‧shims (abutment members)

34a, 34b‧‧‧protrusion (abutment member)

V‧‧‧Clamping bolts

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front view showing a first embodiment of the present invention.

Fig. 2 is a perspective view of a hub portion according to the first embodiment of the present invention.

Fig. 3 is a side view of the hub portion according to the first embodiment of the present invention.

Fig. 4 is a side view showing a hub portion according to a second embodiment of the present invention.

An embodiment of the present invention will be described with reference to Figs. However, the present invention is not limited to the embodiments.

Fig. 1 is a front view of a shaft joint 10 according to a first embodiment of the present invention. The shaft joint 10 is constituted by a pair of boss portions 20, 20a and a laminated disc 40 interposed therebetween. The hub portions 20 and 20a are made of elastically deformed materials such as aluminum, steel, and resin. As will be described later, the shafts (not shown) are inserted into the hub portions 20 and 20a, respectively, and the shafts are locked by the shaft portions 20 and 20a. The present invention is applicable as long as one of the hub portions 20 or 20a is of a double-clamp type, and is not provided with a shaft joint in the form of a laminated disc 40, or a shaft in the form of a dislocation absorber such as rubber or elastomer. Joints and the like are also applicable.

2 is a perspective view showing the relationship between the hub 20 and the shaft S. In addition, in FIG. 2, the slits 23a and 23b and the spacers 32a and 32b are more exaggerated for convenience of explanation. This point is also the same in Figure 3. Further, since the hub portions 20 and 20a of the shaft joint 10 have a symmetrical structure, the description of the boss portion 20a is omitted for the description of the hub portion 20.

The hub portion 20 includes slits 26 and 26a (see FIG. 1) for sandwiching the hub in one of the radial directions, and the base 22 and the clamp hub 24 are formed. The holding hub forming slits 26 and 26a are generally provided in a range in which the shrinkage of the slits 23a and 23b described later is symmetrical with respect to the axial direction.

A shaft hole 28 is provided on the inner diameter side of the clamping hub 24, and the pair of slits 23a, 23b facing the axial direction covers the radial direction of the clamping hub 24, and is disposed symmetrically with respect to the radial direction of the hub portion 20. position. The diameter of the shaft hole 28 is generally formed to be larger than the diameter of the shaft S, and the shaft S can be inserted into the shaft hole 28.

A bolt hole 21a is provided in the direction in which the clamp hub 24 is orthogonal to the slit 23a, and the clamp bolt V can be screwed into the bolt hole 21a. Further, a bolt hole 21b (see FIG. 3) is similarly provided in a direction orthogonal to the slit 23b.

After the clamping bolt V is screwed into each of the bolt holes 21a, 21b in a state where the shaft S is inserted into the shaft hole 28, the slits 23a, 23b of the holding hub 24 are contracted, and the diameter of the shaft hole 28 is reduced to sandwich the hub 24. The inner circumference is in close contact with the shaft S. Therefore, the hub 20 is locked with the shaft S. Therefore, the diameter of the shaft hole 28 and the width of the slits 23a, 23b are such that the inner circumferential surface of the holding hub 24 is in close contact with the shaft S when the clamping bolt V is screwed into the bolt holes 21a, 21b, and the shaft The relationship between the diameters of S is determined.

Fig. 3 is a side view showing the hub portion 20 in a state in which the clamp bolts V are screwed into the bolt holes 21a, 21b. For convenience of explanation, the axis S is omitted from illustration. Between the slits 23a and 23b, spacers 32a and 32b corresponding to the abutting members are provided. The spacers 32a and 32b are annular in order to allow the clamp bolt V to be inserted.

After the clamp bolts V are locked, the slit faces 25a, 25b, 27a, and 27b of the clamp hub 24 abut against the spacers 32a and 32b with a predetermined degree of locking, and the spacers 32a and 32b are interposed. As a result, the clamping bolt V cannot be further locked. Therefore, as long as the clamping bolt V is locked to this point, a certain degree of locking of the clamping bolt V can be achieved. That is, there is no need to lock the clamping bolts V a little bit in order to make the locking degree constant.

The spacers 32a and 32b are capable of withstanding the holding by the slit faces 25a, 25b, 27a, and 27b. The strength of the surface pressure can be. Further, it is preferable that the thickness of the spacers 32a and 32b is the same as the width of the slits 23a and 23b at the time when the inner circumferential surface of the holding hub 24 is in close contact with the shaft S when the clamp bolt V is screwed into the bolt holes 21a and 21b. The reason is that if the spacers 32a, 32b are too thin, it is impossible to ensure a certain degree of locking of the clamping bolt V. If the spacers 32a, 32b are too thick, the locking force of the hub 20 and the shaft S is lowered. Specifically, the thickness of the spacers 32a and 32b depends on the relationship between the diameter of the shaft S and the shaft hole 28, but is generally in the range of 0.7 to 0.9 when the width of the slits 23a and 23b is 1. By interposing the spacers 32a, 32b of a suitable thickness, the degree of contraction of the slits 23a, 23b can be made constant, and the offset between the axis of the shaft S and the center of gravity of the shaft joint 10 can be minimized. The hub 20 and the shaft S are surely locked. Therefore, the vibration of the shaft S when rotating at a high speed can be suppressed.

Since the annular gaskets 32a and 32b described above are different from the hub portion 20, the conventional double-clamping shaft joint can be used as the shaft of the present invention by adding only the gaskets 32a and 32b. Connector.

Fig. 4 is a side view of the hub portion 20b according to the second embodiment of the present invention. In FIG. 4, the slits 23a and 23b and the projections 34a and 34b are also exaggeratedly drawn for convenience of explanation, and the illustration of the axis S is omitted. Further, since the basic configuration of the hub portion 20b is the same as that of the hub portion 20, only differences will be described below.

The hub portion 20b is formed with projections 34a and 34b corresponding to the abutting members on the slit faces 25b and 27a of the holding hub 24. After the bolt V is locked, since the slit faces 25a, 25b, 27a, 27b of the holding hub 24 abut against the projections 34a, 34b with a predetermined degree of locking, the bolt V cannot be further locked. Therefore, the same effects as those of the hub portion 20 can be exhibited by the projections 34a and 34b.

The projections 34a and 34b may be formed in any shape at any position of the slit faces 25a, 25b, 27a, and 27b, and may be formed on both faces of the slit faces 25a and 25b, 27a and 27b, depending on the occasion. . Further, the heights of the projections 34a and 34b are preferably the same as the thickness of the spacers 32a and 32b, and the inner peripheral surface of the holding hub 24 is in close contact with the shaft S when the clamping bolt V is screwed into the bolt holes 21a and 21b. The slits 23a and 23b at the same time have the same width. The reason is that if the height of the projections 34a, 34b is too low, the degree of locking of the clamping bolt V cannot be ensured, and if the height of the projections 34a, 34b is too high, the locking force of the hub 20b and the shaft S is lowered. Specifically, the height of the projections 34a and 34b depends on the relationship between the axis S and the diameter of the shaft hole 28. However, in general, when the width of the slits 23a and 23b is 1, the height is in the range of 0.7 to 0.9. By providing the projections 34a and 34b of an appropriate height, the slits 23a and 23b can be contracted to a constant extent, and the offset between the axial center of the shaft S and the center of gravity of the shaft joint 10 can be minimized. The hub 20b and the shaft S are indeed locked. Therefore, the vibration of the shaft S when rotating at a high speed can be suppressed.

As described above, if the abutting members are the projections 34a and 34b, the trouble of passing the spacers 32a and 32b through the bolts V like the hub portion 20 can be eliminated, so that the assembly work of the shaft joint can be made simpler.

As described above, with the present invention, the degree of locking of the clamp bolts can be made uniform, so that there is no need to interlock the previous pair of clamp bolts. Therefore, the assembly work time of the shaft joint can be shortened. In addition, since it is not necessary to use the dial indicating gauge, it can be suitably applied in the case where the space for mounting the shaft joint is narrow.

10‧‧‧ shaft joint

20‧‧‧ Hub

20a‧‧‧ hub

26‧‧‧Slit

26a‧‧‧slit

40‧‧‧Multilayer discs

V‧‧‧Clamping bolts

Claims (3)

A shaft joint having a clamping hub portion and a clamping bolt, wherein the clamping hub portion is disposed at a position symmetrical with respect to a shaft aperture direction on the inner diameter side toward the axial direction, the clamping bolt facing the aforementioned clip The holding hub portion is inserted in a direction orthogonal to the pair of slits, respectively, and is characterized in that an abutting member is provided between the pair of slits. The shaft joint according to claim 1, wherein the abutting member is an annular gasket through which the clamp bolt is inserted. The shaft joint according to the first aspect of the invention, wherein the abutting member is a protrusion provided on a slit surface of the clamping hub portion.