JPH0612254Y2 - Intermediate shaft coupling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an intermediate shaft coupling that connects a drive shaft and a driven shaft to form a long rotating shaft.

(Prior Art) In a vertical shaft pump or the like, a distance between a drive motor and an impeller is long, and a rotary shaft of the vertical shaft is configured to be long by connecting a plurality of shafts. Rotational torque and axial thrust are applied to the intermediate shaft coupling for connecting the shafts.

Here, an example of a conventional intermediate shaft coupling will be described with reference to FIGS. 5 to 7. 5 is a side view of a conventional intermediate shaft coupling called a muff coupling or a sleeve type coupling, FIG. 6 is a sectional view taken along the line AA of FIG. 5, and FIG. [Fig. 6] is a sectional view taken along the line BB of Fig. 5.

In FIG. 5 to FIG. 7, a constricted portion 2 is formed at a lower end portion of a drive shaft 1 connected to a drive motor (not shown) and an enlarged portion 3 having a diameter larger than that of the constricted portion 2 and smaller than that of the drive shaft 1. Is formed. Further, a constricted portion 5 and an enlarged portion 6 similar to those of the drive shaft 1 are formed on the upper end portion of the driven shaft 4 connected to the impeller (not shown). The drive shaft 1 and the driven shaft 4 are arranged so as to face each other, and the small diameter portions formed at both ends in the axial direction are fitted into the constricted portions 2 and 5 of the opposite shaft end portions of the drive shaft 1 and the driven shaft 4. 7 is assembled. This 2
The split thrust ring 7 can be divided into two by an axial dividing surface, and the outer diameters thereof are the same as the ends of the drive shaft 1 and the driven shaft 4. Further, key grooves 8 and 9 are axially formed on the outer peripheral surfaces of the drive shaft 1 and the driven shaft 4, and keys 10 and 11 are inserted into the key grooves 8 and 9, respectively. Further, a tubular joint sleeve 12 is fitted over the both ends of the drive shaft 1 and the driven shaft 4. This fitting sleeve
A key groove 13 into which the keys 10 and 11 are inserted is formed on the inner peripheral surface of 12 so as to reach the openings at both ends in the axial direction. Then, in order to position the joint sleeve 12 in the axial direction, the driven shaft 4
A step portion 14 is formed on the joint sleeve 12 and a key groove 13 is formed on the joint sleeve 12.
Face the keys 10 and 11 inserted in
5 and 16 are drilled and set bolts 17 and 18 are screwed in.

In such a configuration, the rotational torque is transmitted from the drive shaft 1 to the joint sleeve 12 via the key 10, and is further transmitted from the joint sleeve 12 to the driven shaft 4 via the key 11. Further, the axial thrust is transmitted by the constricted portions 2 and 5 at both shaft ends and the split thrust ring 7 fitted thereto.

Further, another example of the conventional intermediate shaft coupling will be described with reference to FIG. FIG. 8 is a vertical sectional view of a conventional intermediate shaft coupling called a screw-in type.

In FIG. 8, a reverse screw portion 21 is formed on the lower end of the drive shaft 20, and a screw portion 22 having a small diameter is formed on the tip side of the reverse screw portion 21. Further, as with the drive shaft 20, a reverse screw portion 24 and a screw portion 25 are formed on the upper end portion of the driven shaft 23. Then, the connecting sleeve 26 having an internal thread formed on the inner circumference is formed on the threaded portions of both the drive shaft 20 and the driven shaft 23.
Both ends of the drive shaft 20 and the driven shaft 23 are connected by being screwed in over 22 and 25. Further, the detent sleeves 27 and 28 are respectively screwed into the reverse screws 21 and 24 of the drive shaft 20 and the driven shaft 22 and fitted to the outer circumferences of the small diameter portions formed at the ends of the connecting sleeve 26. And the connecting sleeve 26
Set screw holes 29, 30 are bored through the fitting portions of the detent sleeves 27, 28, and the detent screws 31, 32 are screwed in.

In such a configuration, the reverse screw portions 21 and 24 and the screw portions 22 and 25
Indicates that the tightening is opposite to the rotational torque in the axial direction,
If the detent sleeves 27 and 28 do not shift in the axial direction with respect to the connecting sleeve 26, the rotational torque is transmitted. Further, the axial thrust is transmitted by the connecting sleeve 26.

(Problems to be Solved by the Invention) By the way, in the conventional intermediate shaft coupling shown in FIGS. 5 to 7, since the constricted portions 2 and 5 are provided at both ends of the drive shaft 1 and the driven shaft 4, The mechanical strength is weak. Also, in order to prevent backlash in the axial direction, the constricted portions 2, 5 and 2 are
High precision is required for machining the split thrust ring 7.
In particular, it is difficult to machine the inner diameter of the split thrust ring 7 having a small shaft diameter. Further, in order to disassemble the drive shaft 1 and the driven shaft 4, the joint sleeve 12 must be moved in the axial direction until the entire length of the split thrust ring 7 is exposed. However, the joint sleeve 12 and the drive shaft 1 and the driven shaft 4
There was a problem in that water stains adhered to the gaps, etc., making it difficult to slip and disassembling work took a lot of time.

Further, the conventional intermediate shaft coupling shown in FIG.
Since the rotational torque and the axial thrust are transmitted by the 4 and the screw portions 22 and 25, in order to prevent backlash in the axial direction and the axial direction, it is necessary to perform screw processing with high precision, and the processing cost is high. Further, there has been a problem that disassembling and reassembling takes time because the screw threads of the detent screws 31 and 32 for fixing the detent sleeves 27 and 28 to the connecting sleeve 26 are crushed by the rotating torque or the like.

The present invention has been made in view of the circumstances of the conventional intermediate shaft coupling as described above, and an object thereof is to provide an intermediate shaft coupling having a simple structure and easy to disassemble and assemble.

(Means for Solving the Problems) In order to achieve such an object, the intermediate shaft coupling of the present invention is
Axial screw holes are formed at both ends of the rotating drive shaft and the driven shaft, respectively, and long screw bolts having male threads formed at both ends are screwed into these screw holes to allow the drive shaft and the driven shaft to move. And a joint sleeve is fitted over both ends of the drive shaft and the driven shaft, and the joint sleeve and the drive shaft and the driven shaft are keyed to each other.

Further, the drive shaft and the driven shaft and the key stop of the joint sleeve may be formed by providing a plurality of keys at positions where the circumference is equally divided.

(Operation) By screwing both ends of the long screw bolt into the screw holes at both shaft ends of the drive shaft and the driven shaft, both shafts are connected with a simple structure, and the thrust in the axial direction is connected through these long screw bolts. Transmitted.
Then, the relative position in the axial direction of both shafts can be adjusted by the screwing depth of the long screw bolt. This relative position can be adjusted by one lead of the long screw bolt every 360 ° rotation if there is one key around the axis.

Further, if a plurality of keys are provided at positions evenly divided around the circumference, the relative position of both shafts in the axial direction is set to 1 of the long screw bolt.
The lead can be adjusted in a unit as small as a fraction of the number of keys.

(Embodiment) An embodiment of the intermediate shaft coupling of the present invention will be described below with reference to Figs.
It will be described with reference to the drawings. FIG. 1 is a side view of an embodiment of the intermediate shaft coupling of the present invention, and FIG. 2 is CC of FIG.
FIG. 3 is a sectional view taken in the direction of an arrow, and FIG. 3 is a sectional view taken along the line DD in FIG.

In FIGS. 1 to 3, a screw hole 41 is axially formed in the lower end surface of the drive shaft 40 in the axial direction. Further, similarly, a screw hole 43 is bored in the upper end surface of the driven shaft 42 in the axial direction on the axial center. These screw holes 41 and 43 are the same screw. And
Both ends or one end of one long screw bolt 44 having a male screw formed over the entire length is screwed into the screw holes 41 and 43.
Further, key grooves 45 and 46 are axially formed on the outer peripheral surfaces of the drive shaft 40 and the driven shaft 42, and keys 47 and 48 are inserted into the key grooves 45 and 46, respectively. And further, drive shaft 40
And a cylindrical joint sleeve 49 extending over both shaft ends of the driven shaft 42.
Are fitted. The inner surface of this joint sleeve 49 is
A key groove 50 into which 47 and 48 are inserted is formed so as to reach both end openings in the axial direction. A step portion 51 is formed on the driven shaft 42 to position the joint sleeve 49 in the axial direction. Further, in the joint sleeve 49, the screw holes 51 and 52 for the fixing bolt are drilled so as to face the keys 47 and 48 inserted in the key groove 50,
The set bolts 53 and 54 are screwed in.

In such a configuration, the rotational torque is transmitted from the drive shaft 40 to the joint sleeve 49 via the key 47, and is further transmitted from the joint sleeve 49 to the driven shaft 42 via the key 48. In addition, the axial thrust is the screw hole 41,
It is transmitted by long screw bolts 44, both ends of which are screwed into 42.

The relative position of the drive shaft 40 and the driven shaft 42 in the axial direction can be adjusted by the depth of screwing the long screw bolt 44 into the screw holes 41, 42. This relative position can be adjusted in units of one lead of the long screw bolt 44.

FIG. 4 is a cross-sectional view of another embodiment of the intermediate shaft coupling of the present invention. In FIG. 4, the same members as those in FIG. 3 are designated by the same reference numerals, and a duplicate description will be omitted.

In FIG. 4, the difference from FIG. 3 lies in the drive shaft 40.
And the keyway 4 at the position where the outer circumference of the driven shaft 42 is equally divided into three.
Forming 5,45,45,46,46,46, this keyway 45,45,45,46,4
Keys 47, 47, 47, 48, 48, 48 are inserted into 6, 46, respectively, and further, the keyway is formed at the position where the inner circumference of the joint sleeve 49 is equally divided into 3
It is in the formation of 50,50,50.

As you can see, the three keys 4
By providing 7,47,47,48,48,48 respectively, the key can be locked every time the driven shaft 42 is relatively rotated about the axis of 120 ° with respect to the drive shaft 40. Therefore, the relative positions of the drive shaft 40 and the driven shaft 42 can be adjusted in the axial direction in units of 1/3 of one lead of the long screw bolt 44.

It should be noted that in the embodiment shown in FIG. 4, the number of keys is not limited to three, and it is clear that a plurality of keys may be provided at positions at which the circumference is evenly divided. In addition, the number of keys is one around the shaft, and a plurality of key grooves are provided on the inner peripheral surface of the joint sleeve 49 so that the keys can be locked at a plurality of positions around the shaft. The unit by which the relative position can be adjusted in the axial direction may be small. Further, either the drive shaft 40 or the driven shaft 42 and the joint sleeve 49 may be keyed around the shaft at a plurality of positions.

(Effects of the Invention) Since the intermediate shaft coupling of the present invention is configured as described above, it has special effects as described below.

In the intermediate shaft coupling according to claim 1, since the axial thrust is transmitted by the long screw bolts screwed into both the shaft ends of the drive shaft and the driven shaft, the constricted portion is formed at the shaft end like the conventional one. It is structurally simple and does not require mechanical properties, and has excellent mechanical strength. Moreover, since there is no constricted portion like the conventional one, the distance for moving the joint sleeve in the axial direction at the time of disassembling becomes shorter, and the disassembling work is easy. Further, unlike other conventional ones, high precision is not required in the processing of the screw in order to prevent looseness, and the manufacturing is easy. Furthermore, the relative position of the drive shaft and the driven shaft in the axial direction can be adjusted by the screwing depth of the long screw bolt, and the shaft length can be adjusted at the installation site such as a vertical shaft pump, which is extremely useful for practical use. is there.

In the intermediate shaft joint according to the second aspect, the relative position in the axial direction of the drive shaft and the driven shaft can be adjusted in fine units, and can be adjusted with high precision.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the intermediate shaft coupling of the present invention, FIG. 2 is a sectional view taken along the line CC of FIG. 1, and FIG.
1 is a sectional view taken along the line DD of FIG. 1, FIG. 4 is a lateral sectional view of another embodiment of the intermediate shaft coupling of the present invention, and FIG.
FIG. 6 is a side view of a conventional intermediate shaft coupling called a muff coupling or a sleeve type coupling, FIG. 6 is a sectional view taken along the line AA of FIG. 5, and FIG. Fifth
FIG. 8 is a sectional view taken along the line BB of FIG. 8, and FIG. 8 is a vertical sectional view of a conventional intermediate shaft coupling called a screw type. 40 …… Drive shaft, 41,43 …… Screw hole, 42 …… Drive shaft, 44 …… Long screw bolt, 45,46,50 …… Key groove, 47,48 …… Key, 49 …… Coupling sleeve.

Claims (2)

[Scope of utility model registration request] 1. A screw hole in the axial direction is bored in each of opposite shaft ends of a rotating drive shaft and a driven shaft, and a long screw bolt having male threads formed at both ends is screwed into the screw holes. A drive shaft and a driven shaft are connected to each other, a joint sleeve is fitted over both end portions of the drive shaft and the driven shaft, and the joint sleeve and the drive shaft and the driven shaft are keyed to each other. An intermediate shaft coupling characterized in that 2. The intermediate shaft joint according to claim 1, wherein the drive shaft, the driven shaft, and the joint sleeve are keyed together.
An intermediate shaft coupling, wherein a plurality of keys are provided at positions where the inner circumference is equally divided.