JPH06173965A - Intermediate shaft coupling for vertical pump - Google Patents

Abstract

PURPOSE:To provide a compact intermediate shaft coupling having sufficient strength by faucet-coupling the end sections of an upper shaft and a lower shaft, pinching the protruded stripe sections of both shafts with a two-piece ring, coupling the female serration section of a sleeve with serration sections of both shafts and the ring, and fixing the ring with a set bolt. CONSTITUTION:A sleeve 40 is fitted to an upper shaft 1, a coupling shaft section 6 is faucet-coupled, the half section 30a of a two-piece ring 30 is covered and pinched on protruded stripe sections 4, 13 and cylinder sections 5, 14 in the X-direction, and a positioning groove 34 is matched with the position of a set bolt 43. The sleeve 40 is lowered in the Y-direction, the lower end face is hooked on a barrel section 11, a female serration section 41 is coupled with serration sections 3, 12 of shafts 1, 10, the inner periphery of the length L1 of the female serration section 41 is coupled with the outer periphery of the two-piece ring 30, the set bolt 43 is fastened, and the sleeve 40 is fixed via the groove 34. Torque is transmitted via the serration sections 3, 41, 12, and the torque is dispersed. The tensile axial force is dispersed to the recessed stripe sections 31, 32 of the two-piece ring 30 and the protruded stripe section of the shafts 1, 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermediate shaft coupling for a vertical pump.

[0002]

2. Description of the Related Art Some large vertical pumps connect a plurality of shafts, and various types of joints are provided in this case.

An example thereof will be described with reference to FIG. A flange portion 50 and a fitting shaft portion 6A are formed in a lower portion of the upper shaft 1A, and a flange portion 50A similar to the flange portion 50 and a fitting shaft portion 6A are fitted in a cage in an upper portion of the lower shaft 10A. The fitting recess 15A is formed.

A split ring 30A for sandwiching the flange portions 50, 50A is provided, and a sleeve 40A for engaging the shafts 1, 10 and the split ring 30A is provided.

The sleeve 40A has two shafts 1A and 1A.
It is fixed in the rotational direction by the 0A key 51 and is fixed in the vertical direction by the set screw 51.

With this structure, torque is transmitted through the key 51, and tensile axial force is applied to both flange portions 50,
50A, split ring 30A.

[0007]

In the conventional intermediate shaft coupling, since the torque is transmitted by the two keys 51, the length L2 of the sleeve 40A becomes long.

Further, since the tensile axial force is received by the flange portion 50 and the split ring 30A, the height H of the flange portion 50 is
1 becomes high, and the strength design in the radial direction becomes troublesome.

An object of the present invention is to provide an intermediate shaft coupling for a vertical pump which is compact and has sufficient strength.

[0010]

According to the present invention, a serration portion formed in the lower portion of the upper shaft in order from above, a ridge portion formed of a plurality of truncated frustoconical ridges, a cylindrical portion, and a fitting portion. A mating shaft portion, a body portion formed in order from the upper lower side of the lower shaft, a serration portion similar to the serration portion, a protrusion portion similar to the protrusion portion, a column portion having the same diameter as the column portion, and A fitting recess that is fitted in the fitting shaft portion, a split ring that engages with and sandwiches both the projecting ridges and the columnar portions, and engages both the serrations and the split ring. And a set bolt for fixing the sleeve to the split ring.

In the serration portion, for example, 20 sheets to
It is preferable to use 60 sheets of involute serration with an angle of 45 degrees, for example.

Further, for example, five ridges are provided in the ridge portion.
It is preferable that they are formed so as to reduce the diameter toward each other.

[0013]

In the intermediate shaft joint of the vertical pump constructed as described above, the torque is transmitted through the serration portion. Therefore, since the torque is dispersed by the large number of serration blades, the stress at the blade base is small and the length can be shortened.

Further, the tensile axial force is received by both the ridges and the sleeve. Therefore, since the axial force is shared by the plurality of protrusions of the protrusion, the height of the protrusion can be reduced.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, below the upper shaft 1 having a shaft diameter D, there are a small diameter portion 2 slightly smaller than the shaft diameter D, and a serration portion 3 and a serration portion 3 each having a diameter larger than the small diameter portion 2 by a tooth height. A ridge portion 4 composed of a plurality of ridges having a small diameter and a truncated conical surface shape, a columnar portion 5 and a columnar portion 5 having an outer diameter equal to the outer diameter of the ridge portion 4.
The fitting shaft portion 6 having a smaller diameter is sequentially formed. The ridge portion 4 is formed so that the diameter of the ridge is reduced downward, and the serration portion 3 is formed of, for example, 20 to 60 involute serrations having a pressure angle of 45 degrees.

On the other hand, on the upper portion of the lower shaft 10 supported by the bearing 16 via the sleeve 17, the body portion 11, the serration portion 12 similar to the serration portion 3, and the protrusion portion 4 are compressed. The ridge portion 13 whose radial direction is upward, the cylindrical portion 5
A cylindrical portion 14 having the same diameter as that of the above and a fitting concave portion 15 that is fitted into the fitting shaft portion 6 in a cage are formed.

These ridges 4 and 13 and the columnar portion 5,
14 is engaged with and sandwiched, and the outer diameters of the serration portions 3 and 12
A split ring 30 having a diameter equal to the root diameter is provided. On the inner circumference of the half portion 30a of the split ring 30, concave groove portions 31, 32 and cylindrical portions 5, 1 engaging with the protrusion portions 4, 13 are provided.
An annular groove portion 33 that engages with the outer diameter and the total thickness of 4 is formed, and a positioning groove 34 that engages with a set bolt 43 described later is formed on the outer periphery.

A sleeve 40 is provided which engages the serrated portions 3 and 12 and the split ring 30. On the inner circumference of the sleeve 40, the serration portion 3,
Female serration part 4 longer than length 12 by length L1
1 and 41 are formed, and a bolt hole 42 for a set bolt 43 is formed on the outer circumference.

Next, the operation will be described.

When connecting the lower shaft 1 and the lower shaft 10, FIG.
As shown in the right half of FIG. In that state, the fitting shaft portion 6 is fitted in the fitting recess into the cage.

Next, the half portion 30a of the split ring 30 is
30a is covered and sandwiched in the direction of arrow X on both ridges 4 and 13 and both columnar parts 5 and 14, and the positioning groove 34 is aligned with the position of the set bolt 43.

Finally, as shown in the left half of FIG. 1, the sleeve 40 is lowered in the Y direction so that the lower end surface is locked to the body part 11, and the female serration parts 41, 41 are serrated on both shafts 1, 10. After engaging the inner circumferences of the lengths L1 of the female serration portions 41, 41 with the outer circumferences of the split ring 30, the set bolts 43 are tightened to form the grooves 34. The sleeve 40 is fixed in the vertical direction through

Next, the operation will be described with reference to FIG.

The axes of the shafts 1 and 10 are aligned with each other by the cage fitting of the fitting shaft portion 6 and the fitting concave portion 15, and the misalignment is so small that it can be ignored.

The torque is transmitted by the serration unit 3
And the female serration unit 41 and the female serration unit 41 and the serration unit 12. Since the serration portion is 20 to 60 sheets of 45-degree involute serolation, the torque is dispersed and the bending stress at the blade edge is small. Therefore, in the conventional joint (FIG. 3) having the same shaft diameter D, the ratio (L2 / D) between the length L2 and the shaft diameter D is 4 to 6, while the ratio (L / D) is 1 to 1. It can be 2.

Further, the tensile axial force is dispersed and reliably borne by the concave streak portions 31 and 32 of the split ring 30 and the projecting streak portion 13 of both shafts 1 and 10. Therefore, the height H of the ridge of the ridge can be reduced, and the strength design in the radial direction can be facilitated accordingly.

Further, the compressive force is received at the ends of the cylindrical portions 5 and 14, and does not act on the split ring 30 and the sleeve 40.

[0029]

Since the present invention is constructed as described above, the length of the joint can be reduced to, for example, 1/3 to 1/4 on the shaft of the same diameter reduction, and the size can be made compact and sufficient. It is possible to obtain various strengths and improve the quality.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, showing a state before attachment of a split ring in a right half portion and a state after being connected in a left half portion.

FIG. 2 is a side sectional view illustrating an effect.

FIG. 3 is a side sectional view showing a conventional joint.

[Explanation of symbols]

 1, 1A ... Upper shaft 2 ... Small diameter part 3, 12 ... Serration part 4, 13 ... Ridge part 5, 14 ... Cylindrical part 6, 6A ... Fitting shaft part 10 10A ... Lower shaft 11 ... Body part 15, 15A ... Fitting recess 16 ... Bearing 17 ... Sleeve 30, 30A ... Split ring 30a ... Half part 31, 32 ... Recessed portion 33 ... Annular groove portion 34 ... Positioning groove 40, 40 ... Sleeve 41 ... Female serration portion 42 ... Bolt hole 43, 52 ... Set bolt 50 ... Flange 51 ... Key

Claims (1)

[Claims] 1. A serration portion formed in the lower portion of the upper shaft in order from the top, a ridge portion composed of a plurality of truncated frustoconical surface ridges, a cylindrical portion and a fitting shaft portion, and an upper portion of the lower shaft. Fitted in a trunk portion formed in order from below, a serration portion similar to the serration portion, a rib portion similar to the rib portion, a column portion having the same diameter as the column portion, and the fitting shaft portion. Fitting recess, a split ring that engages and sandwiches both the projecting ridges and the columnar portions, a sleeve that engages the serrations and the split ring, and the two sleeves. An intermediate shaft coupling for a vertical pump, characterized in that a set bolt for fixing to the split ring is provided.