JPH0549843B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission fastener that is disposed between a shaft-shaped component and a ring-shaped component, and firmly connects the two to transmit power.

B. Prior art In the power transmission systems of various industrial machines and devices,
When a shaft-shaped part, for example a rotating shaft, is provided with a ring-shaped part, such as a cam, a gear, a pulley, etc., if both are formed integrally, the rigidity is high and the power transmission efficiency is also good. It is very often difficult to do so.

Therefore, the shaft-like part and the ring-like part are usually formed separately, and after they are formed, the two parts are joined together using appropriate means.

Typical means for integrally connecting the shaft-shaped component and the ring-shaped component are, for example, a key or a spline. If by key,
As shown in FIG. 10, key grooves 3 and 4 are formed in the axial direction so as to face the shaft-shaped part 1 and the ring-shaped part 2, and a matching key 5 is inserted across both key grooves 3 and 4. The shaft-shaped component 1 and the ring-shaped component 2 are connected together by inserting the shaft-shaped component 1 into the ring-shaped component 2. Furthermore, as shown in FIG. 11, spline connection is achieved by forming several splines 6, 6... on the outer peripheral surface of the shaft-shaped component 1, and corresponding splines 6, 6... on the inner peripheral surface of the ring-shaped component 2. Several grooves 7, 7, . . . are formed, and the splines 6, 6, .

However, in the above connection method, in order to firmly connect the shaft-like part 1 and the ring-like part 2, the keyway 3,
4 and key 5, or spline 6, 6... and groove 7,
It is necessary to fit the keyways 3, 4 and the key 5, or the splines 6, 6, and the grooves 7, 7, with high precision, and precision machining is required. In particular, the spline 6 was difficult to process and had a high manufacturing cost.

Furthermore, in the above-mentioned coupling method, both or one of the shaft-like part 1 and the ring-like part 2 are grooved and power is transmitted through the grooves, so the rigidity and durability are low.

Another method of joining is to join the shaft-like part 1 and the ring-like part 2 with a negative gap by pressure fitting, shrinkage fitting, or the like. This method has high bonding rigidity and good durability, but
There was a problem that it was difficult to assemble.

Therefore, a fastening fitting called Shupan Ring (trade name) has been proposed as a fastening fitting that improves the above problems and has strong bonding force and high durability similar to shrink fit, and is easy to assemble. There is. As shown in FIG. 12, this fastening fitting 8 consists of a set of an inner ring 9 and an outer ring 10, and the outer peripheral surface of the inner ring 9 and the outer ring 1
Tapered surfaces 11 and 12 are formed symmetrically to the inner circumferential surface of 0.

The fastening fitting 8 has an inner ring 9 mounted on the shaft-shaped component 13, an outer ring 10 inserted into the ring-shaped component 14, and a pressurizing flange 1 mounted on the shaft-shaped component 13 in this state.
5 and the ring-shaped part 14, a lock bolt 16 is inserted between the
is tightened to press the outer ring 10 against the inner ring 9 using the pressure flange 15, and the tapered surfaces 11, 1 of the inner and outer rings 9, 10 are tightened.
2, the diameter of the inner ring 9 is reduced and the shaft-shaped part 13 is
The outer ring 10 is expanded in diameter and brought into close contact with the ring-shaped part 14, and the shaft-shaped part 13 and the ring-shaped part 1 are brought into close contact with each other.
Combine with 4.

The fastening fitting 8 has inner and outer rings 9, 10 with tapered surfaces 1
Since the shaft-shaped part 13 and the ring-shaped part 14 are pressed together by the wedge action of the members 1 and 12, the coupling is reliable, the coupling rigidity is high, and the durability is excellent.

However, since the fastening fitting 8 cannot have a long axial length, the ring-shaped part 14 having a long axial length
In the case of coupling, as shown in FIG. 13, a plurality of sets of fastening fittings 8, 8, . . . are arranged and coupled in the axial direction. When multiple sets of fasteners 8, 8... are used in this way, even if a strong force is applied by the pressure flange 15, the pressing force on all the fasteners 8, 8... will not be constant due to frictional resistance. The further away from the pressure flange 15, the weaker the bonding force between the fasteners 8, 8, etc. becomes. There was a problem that the number of metal fittings 8, 8, . . . was not multiplied by an integral number. Therefore, when a high bonding force is required, a large number of fastening fittings 8, 8, etc. must be used, resulting in a problem that the assembly work becomes troublesome.

B. Purpose of the Invention The present invention aims to provide a fastening fitting that has a high bonding force and is easy to assemble.

C. Structure of the Invention This invention provides that one slope 31a along the axial direction
An inner ring 28 whose diameter can be reduced has a serrated protrusion 31 spirally formed on the outer peripheral surface, which is longer than the other slope 31b.
an outer ring 29 which can be expanded in diameter and has a serrated protrusion 33 spirally formed on its inner peripheral surface that engages with the protrusion 31 of the inner ring 28; and a pressurizing flange 23;
1 and 33 are interlocked between the long slopes 31a and 33a and between the short slopes 31b and 33b.
The inner ring 28 and the outer ring 29 are loosely fitted with the inner ring 28 and the outer ring 29 provided.

The above-mentioned power transmission fastener has an inner ring 28 mounted on the outer peripheral surface of the shaft-shaped component 20, an outer ring 29 mounted on the inner peripheral surface of the ring-shaped component 21, and a pressurizing flange 23 coupled to the ring-shaped component 21. , inner ring 28 and outer ring 2
9 are tightened together in the axial direction, and due to the wedge action of the meshing protrusions 31 and 33, the inner ring 28 is reduced in diameter and brought into pressure contact with the shaft-shaped component 20, and the outer ring 29 is expanded in diameter and attached to the ring-shaped component 21. The shaft-shaped component 20 and the ring-shaped component 21 are connected by pressure contact.

In the power transmission fastener, the protrusions 31 provided on the inner ring 28 are continuous over the entire length, and the protrusions 33 provided on the outer ring 29 are also continuous over the entire length. Therefore, both protrusions 31,3
Even if 3 has the same shape, it is pressed with the same force over the entire length, so the inner ring 28 and the outer ring 29
uniformly contact the shaft-shaped component 20 and the ring-shaped component 21, respectively, and a strong fastening force can be obtained.

D. Embodiment FIGS. 1 and 2 are drawings showing an embodiment of the present invention, in which 20 is a shaft-shaped component, 21 is a ring-shaped component, and 22 is a shaft-shaped component 20 and a ring-shaped component 21. 23 is a pressure flange, and 24 is a lock bolt.

The shaft-shaped component 20 is formed of, for example, a stepped straight round bar, and the ring-shaped component 21 is positioned by a shaft shoulder 25.

The ring-shaped component 21 has a through-hole 26 formed in the center thereof through which the shaft-shaped component 20 passes, and a large-diameter annular groove 2 for accommodating the fastening fitting 22 on the circumferential surface of the through-hole 26.
7 is formed. The annular groove 27 has an axial length that is equal to or longer than the axial length of the fastening fitting 22.

The fastening fitting 22 has a pair of inner ring 28 and outer ring 29.
It consists of. As shown in FIGS. 3 and 4, the inner ring 28 is made by bending a steel plate into a cylindrical shape having an inner diameter slightly larger than the outer diameter of the shaft-shaped component 20, and has both ends 28a and 28b. A gap 30 is provided to enable diameter reduction, and a protrusion 31 is provided on the outer peripheral surface.
is formed in a spiral shape along the axial direction.
As shown in FIG. 5, the protrusion 31 has a chevron-shaped cross section and is formed in a sawtooth shape with one slope 31a longer than the other slope 31b. On the other hand, the outer ring 29 is the sixth
As shown in FIG. 7 and FIG. 7, the steel plate has an inner diameter smaller than the outer diameter of the inner ring 28 and an outer diameter slightly smaller than the inner diameter of the annular groove 27 of the ring-shaped part 21. It is curved into a cylindrical shape, with both ends 29a and 29b facing each other with a gap 32 between them so that the diameter can be expanded, and a protrusion 33 is formed spirally along the axial direction on the inner circumferential surface. be. This protrusion 3
Similarly to the protrusion 31 of the inner ring 28, as shown in FIG. 8, the cross section of the protrusion 3 is chevron-shaped, and one slope 33a is formed in a sawtooth shape that is longer than the other slope 33b.

The protrusion 33 of the outer ring 29 and the protrusion 31 of the inner ring 28 are formed symmetrically so that the long slopes 33a and 31a can mesh with each other.

The fastening fitting 22 is formed by forming an inner ring 28 into a predetermined shape, and then forming an outer ring 29 into a predetermined shape so as to cover the inner ring 28.
Assemble by interlocking 33. As another method of assembly, the inner and outer rings 28 and 29 may be formed into predetermined shapes, and then the inner ring 28 may be screwed into the outer ring 29 for assembly. Incidentally, in the assembled state of the fastening fitting 22, the protrusions 31 and 33 are not completely engaged with each other, and a gap 34 is formed between the short slopes 31b and 33b. When the protrusions 31 and 33 are completely engaged, the inner diameter of the inner ring 28 becomes smaller than the outer diameter of the shaft-shaped part 20, and the outer diameter of the outer ring 29 becomes larger than the inner diameter of the annular groove 27 of the ring-shaped part 21. Set it so that

The pressure flange 23 includes a cylindrical portion 23a and a flange portion 23b extending in a direction perpendicular to the axial direction. The cylindrical portion 23a is formed to have a thickness that allows it to be inserted between the shaft-shaped component 20 and the annular groove 27 of the ring-shaped component 21, and when the cylindrical portion 23a is brought into contact with the fastening fitting 22, the flange portion 23b and the ring-shaped portion Part 2
1 to form a length 35 necessary for fastening.

A plurality of lock bolts 24 are passed through the pressure flange 23 at the same circumference, and then tightened to the ring-shaped part 21 and attached to the fastening metal fitting 24 via the pressure flange 23.
Press.

When the shaft-shaped component 20 and the ring-shaped component 21 are connected, the ring-shaped component 21 is fitted onto the shaft-shaped component 20, and its end is brought into contact with the shaft shoulder 25 of the shaft-shaped component 20 for positioning. . Thereafter, the fastener 22 is inserted into the annular groove 27 of the ring-shaped component 21, and the inner ring 28 of the fastener 22 is attached to the shaft-shaped component 20, and the outer ring 29 is attached to the annular groove 27. Subsequently, the pressure flange 23 is attached to the shaft-shaped part 20, and the cylindrical part 23
a into the shaft-shaped part 20 and the annular groove 27 to abut against the inner ring 28 of the fastening fitting 22, and at the same time, the outer ring 29
is brought into contact with the vertical wall 36 at the inner part of the annular groove 27. When the pressure flange 23 is installed, lock bolts 24, 2 are attached to the flange portion 23b of the pressure flange 23.
4... is penetrated, and its tip is screwed into the ring-shaped component 21. Then, the lock bolts 24, 24... are tightened to move the pressure flange 23 toward the ring-shaped part 21, and the cylindrical portion 23a of the pressure flange 23 pushes the inner ring 28 of the fastening metal fitting 22 in the axial direction to engage the protrusion 31 of the inner ring 28. The protrusions 33 of the outer ring 29 are brought into pressure contact with each other, and the long slopes 31 of both protrusions 31, 33 are pressed against each other.
Due to the wedge action of a and 33a, the inner ring 28 is reduced in diameter and brought into pressure contact with the shaft-shaped component 20, and the outer ring 29 is expanded in diameter and brought into pressure contact with the ring-shaped component 21.
0 and the ring-shaped part 21 are connected. In addition, the tightening force of the lock bolts 24, 24...
It may be set according to the bonding strength required.

In the above embodiment, the flange portion 23b of the pressure flange 23 is opposed to the ring-shaped part 21, and the lock bolts 24, 24... are provided between the flange part 23b and the ring-shaped part 21 to pressurize the fastening fitting 22. However, the flange portion 23b may be opposed to the shaft-like component 20, and lock bolts 24, 24, . . . may be provided between the flange portion 23b and the shaft-like component 20 to pressurize the fastening fitting 22. In short, the inner ring 28 of the fastening fitting 22 is
The outer ring 29 may be brought into relative pressure contact with the outer ring 29.

Furthermore, both the inner ring 28 and the outer ring 29 of the fastening fitting 22 are not formed into a complete cylindrical shape, but have a structure in which they are partially separated, but as shown in FIG.
One or both of 29 may be formed into a perfect cylindrical shape. In this case, the inner ring 28 and the outer ring 29 may be formed by bending a steel plate on which projections 31 and 33 are formed, and then welding the two ends 28a, 28b, 29a, and 29b together, or alternatively, the inner ring 28 and the outer ring 29 may be formed by bending a steel plate on which projections 31 and 33 are formed, and then welding the ends 28a, 28b, 29a, and 29b together. 3
1 and 33 may be formed.

Effects of the Invention The fastening metal fitting of the present invention has serrated protrusions of the same shape spirally formed on the outer circumferential surface of one inner ring, and serrated protrusions of the same shape spirally formed on the inner circumferential surface of one outer ring. However, since both protrusions are engaged with each other with their long slopes, and the inner and outer rings are loosely fitted with a space provided between the short slopes, it is difficult to connect the shaft-shaped part and the ring-shaped part. , by placing the inner and outer rings between the shaft-shaped part and the ring-shaped part, connecting the pressure flange to the ring-shaped part, and tightening the inner and outer rings in the axial direction, the diameter of the inner ring is reduced and the shaft-shaped part The outer ring expands in diameter and presses against the ring-shaped component, thereby joining the shaft-shaped component and the ring-shaped component. Moreover, the protrusions formed on the inner and outer rings are integrated with the inner or outer ring over their entire length, so even if the protrusions have the same shape and size, they are always pressed under the same conditions over their entire length. Therefore, the inner ring and the outer ring are pressed against the shaft-shaped part and the ring-shaped part over the entire length with strong contact pressure, and the bonding force is very strong, so that the ring-shaped parts having a long axial length can be firmly connected.

In addition, the fasteners only need to match the length of the parts connecting the inner ring and outer ring, and the protrusions are simply formed integrally with the same shape, so manufacturing is very simple and the manufacturing cost is very low. It will be cheaper. Furthermore, since they are connected using a single set of fasteners, there is no need to consider selection and combinations, and the assembly work becomes extremely simple.

Furthermore, the protrusions formed on the inner and outer rings of the fastening fitting have a spiral shape, and the inner and outer rings can be assembled in a screw manner, making it easy to assemble the inner and outer rings.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
The figure is a longitudinal sectional view of Fig. 1, Fig. 3 is a front view of the inner ring of the fastening fitting, Fig. 4 is a half sectional view of the inner ring, Fig. 5 is an enlarged sectional view of the main part of the annular projection of the inner ring, and Fig. 6 7 is a front view of the outer ring, FIG. 7 is a half-sectional view of the outer ring, FIG. 8 is an enlarged sectional view of the main part of the annular projection of the outer ring, FIG. 9 is a front view showing another embodiment of the fastening fitting, and FIG. 10 11 is a sectional view showing a conventional key connection, FIG. 11 is a sectional view showing a spline connection, and FIGS. 12 and 13 are sectional views showing a conventional fastening fitting. 20...Shaft-shaped part, 21...Ring-shaped part, 2
2... Fastening metal fitting, 23... Pressure flange, 24...
... Lock bolt, 27 ... Annular groove, 28 ... Inner ring, 29 ... Outer ring, 31, 33 ... [Spiral]
protrusion.

Claims (1)

[Claims] 1 Consisting of a pair of loosely fitted inner rings and outer rings and a pressure flange, the inner ring and outer ring are arranged between a shaft-shaped component and a ring-shaped component attached to the outer periphery of the shaft-shaped component, and A pressure flange attached to the outer periphery of the shaft-shaped component is coupled to the ring-shaped component, and the inner ring and the outer ring are tightened in the axial direction by the ring-shaped component and the pressure flange. It is a power transmission fastener that connects parts and transmits power, and is a single diameter-reducing fastener that has a serrated protrusion spirally formed on the outer circumferential surface over the entire length, with one slope longer than the other slope. It comprises an inner ring, and an expandable outer ring in which a serrated protrusion that engages with the protrusion of the inner ring is spirally formed over the entire length on the inner peripheral surface, and the protrusion of the inner ring and the outer ring are arranged on long slopes. A fastener for power transmission, characterized in that the inner ring and the outer ring are loosely fitted in a state in which they are engaged and a gap is provided between short slopes.