JP2017172637A - Connection structure of two male screw shafts and two shafts connection structure using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple connection structure for two male screw shafts in which the shafts can be rigidly connected not only against an external force in an axial line direction of two male screw shafts but also against a rotating force around a center axis line, and connection operation can be easily performed.SOLUTION: Opposing end surfaces of two male screw shafts 11, 12 having the same outer diameter and pitch and arranged in a straight line are provided with abutting surfaces 13a, 14a abutted to each other in a rotating direction around a center axis line L, a protrusion part 13 and a concavity part 14 fitting to each other are arranged in opposition, the screw threads 11a, 12a formed at outer peripheral surfaces of both male screw shafts 11, 12 are continuous to each other, the protrusion part 13 and the concavity part 14 are fitted from each other, the opposing end surfaces of both male screw shafts 11, 12 are abutted to each other, and a female screw cylinder 15 is engaged in thread with both male screw shafts 11, 12 to stride on their abutted portions.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a connecting structure of two male screw shafts and a connecting structure of two shafts using the same.

  As a conventional connecting structure for connecting two male screw shafts in a straight line, for example, a small-diameter screw hole is formed on one of the opposing end surfaces of two male screw shafts arranged in a straight line, and a small-diameter screw shaft is used on the other. The end surfaces of the two male screw shafts are butted against each other, and the male screws of both male screw shafts are placed on the inner surface so as to straddle the butted portions. A cylindrical coupler provided with female threads of the same pitch is screwed together (see, for example, Patent Document 2). The end surfaces of two male screw shafts are butted against each other, and the butted portions are connected to the inner surfaces of both male screw shafts. It is sandwiched by a half-cut cylindrical screw provided with a female screw of the same pitch as the male screw, and a nut is screwed onto the male screw provided on the outer peripheral surface of this cylindrical screw (for example, patent document) There is a reference), and the like.

Japanese Utility Model Publication No. 13-3817 JP 2014-15728 A JP 2001-220859 A

However, all of those described in Patent Documents 1 to 3 are firmly coupled to the force in the axial direction of the two male screw shafts, but around the center axis of both male screw shafts. When torque is applied, one male screw shaft may rotate in a loosening direction with respect to the other male screw shaft or a cylindrical coupler (Patent Document 2) or a cylindrical screw (Patent Document 3), and may fall off.
Therefore, the conventional connecting structure of the two shafts as described above connects, for example, the rotating shafts of a plurality of rotors arranged in a water conduit in a hydroelectric power generator in which rotational torque acts around the central axis. The connecting structure is not preferable.

  In view of the above problems of the prior art, the present invention can be firmly coupled not only to the external force in the axial direction of the two male screw shafts but also to the rotational force around the central axis, In addition, it is an object to provide a connection structure of two male screw shafts and a connection structure of two shafts using the same, which are simple in structure and can be easily connected.

According to the present invention, the above problem is solved as follows.
(1) In the connecting structure of two male screw shafts, the outer diameter and the screw pitch are the same, and the two end faces of the two male screw shafts arranged in a straight line are in contact with each other in the rotational direction around the central axis. Protrusions and recesses having contact surfaces and complementary to each other are provided opposite to each other, the threads formed on the outer peripheral surfaces of the male screw shafts are continuous with each other, and the protrusions and the recesses are mutually Two male screws characterized in that the opposite end surfaces of both male screw shafts are butted so as to be fitted, and a female screw cylinder is screwed onto both male screw shafts so as to straddle the butted portion. Shaft connection structure.

According to such a configuration, since the thread formed on the outer peripheral surface of both male screw shafts is screwed into the female screw cylinder, both male screw shafts are not only firmly coupled to the external force in the axial direction, Since the convex and concave portions formed on the opposite end surfaces of both male screw shafts are fitted to each other and their contact surfaces are in contact with each other in the rotational direction around the central axis, even against rotational force around the central axis. Tightly coupled.
Moreover, it is only necessary to form convex portions and concave portions on the opposite end surfaces of the two male screw shafts, but to match them, and to screw both female screw shafts so that the female screw cylinders straddle the butted portions. The structure is simple and the connecting work can be easily performed.

(2) In the above item (1), there is provided a detent means for preventing the female screw cylinder from rotating on any one of the male screw shafts.

  According to such a configuration, the female screw cylinder is prevented from rotating on one male screw shaft by the rotation preventing means, and as a result, the female screw cylinder is also prevented from rotating with respect to the other male screw shaft, so that the female screw cylinder is detached from both male screw shafts. Or the coupling of both male screw shafts can be prevented from being released.

(3) In the above item (2), the anti-rotation means is screwed into a female screw hole facing the radial direction provided in the female screw cylinder, and the tip is in pressure contact with the outer peripheral surface of one of the male screw shafts. The set screw is adapted to be fitted into an engagement hole provided on the outer peripheral surface of one of the male screw shafts.

  According to such a configuration, the structure of the detent means can be simplified.

(4) In any one of the above items (1) to (3), the opposing end portions of the two male screw shafts pass through a convex portion and a concave portion that are orthogonal to the center axis and are fitted to each other. A pin hole is provided, and the pin is fitted into the pin hole.

  According to such a configuration, the two male screw shafts are coupled not only by the female screw cylinder but also by the pin, and are firmly coupled by the double coupling means.

(5) In any one of the above items (1) to (4), the amount of protrusion from the base end to the tip is set at the center of one of the opposing end surfaces of the two male screw shafts from the base end to the tip of the convex portion. A tip-shaped projecting shaft larger than the projecting amount is provided, and a fitting hole into which the projecting shaft can be fitted is provided at the center of the end surface facing the projecting shaft.

  According to such a configuration, when the opposing end surfaces of the two male screw shafts are abutted, by inserting the pointed protruding shaft into the fitting hole, the centering of both male screw shafts is easily performed, and then By rotating one male screw shaft around the central axis with respect to the other male screw shaft, the convex portion and the concave portion can be easily fitted.

(6) In the connecting structure of two shafts, male screw shafts having the same outer diameter and screw pitch are provided at the end portions of the two shafts, and both the shafts are arranged in a straight line with each other. The two male screw shafts that are butted together are connected with the connection structure of the two male screw shafts according to any one of the above items (1) to (5).

  According to such a configuration, the two shafts can be firmly coupled not only to the external force in the central axis direction but also to the external force in the rotational direction around the central axis, and the structure is simple and easy. A connection structure capable of performing a connection operation can be provided.

  According to the present invention, not only the external force in the axial direction of the two male screw shafts but also the rotational force around the central axis can be firmly coupled, and the structure is simple and the connecting operation can be easily performed. It is possible to provide a connecting structure of two male screw shafts and a connecting structure of two shafts using the same.

It is a center vertical front view which fractures | ruptures and shows a part of 1st Embodiment of this invention. Similarly, it is a center longitudinal front view when the connection part of two shafts is disassembled. It is a disassembled perspective view which shows the shape of the opposing edge part of the two male screw shafts in the 2nd Embodiment of this invention. Similarly, it is a central cross-sectional plan view showing a situation in the middle of connection of two male screw shafts. It is a center longitudinal section front view of a part of water turbine which connected a plurality of axes using a 1st embodiment of the present invention. It is an expansion vertical side view in the VII-VII line of FIG. It is a vertical side view which shows the state before the connection in a part of water turbine shown in FIG.

1 and 2 show a first embodiment of a connecting structure of two shafts of the present invention.
This embodiment is applied to a connecting means 10 that connects two shafts 6 and 6, which are a main shaft 8 and an additional shaft 9, in a straight line in a water turbine that is a use example of the present invention described later.

As shown in FIG. 1, the connecting means 10 is a male screw having the same outer diameter and screw pitch at opposite ends of two shafts (main shaft 8 and additional shaft 9) 6 and 6 arranged in a straight line. Protrusions 13 having shafts 11 and 12, and having contact surfaces 13 a and 14 a that are in contact with each other in the rotational direction around the center axis L on opposite end surfaces of both male screw shafts 11 and 12, and complement each other; Both male screws are provided so that the concave portion 14 is opposed to each other, the screw threads 11a, 12a formed on the outer peripheral surfaces of the male screw shafts 11, 12 are continuous with each other, and the convex portion 13 and the concave portion 14 are fitted to each other. The female screw cylinder 15 is screwed so as to straddle the butted portions of the male screw shafts 11 and 12 in a state where the opposed end surfaces of the shafts 11 and 12 are butted.
Needless to say, the internal thread of the internal thread cylinder 15 is engraved with internal threads that are threadedly engaged with the threads 11a and 12a of the external thread shafts 11 and 12.

  In this example, the opposing end surfaces of both male screw shafts 11 and 12 have the same shape each having a convex portion 13 and a concave portion 14.

A female screw hole 16 facing in the radial direction is provided on one side of the female screw cylinder 15, and an engagement hole 17 is provided on the outer peripheral surface of one male screw shaft 11 corresponding thereto.
As shown in FIG. 2, with the female screw hole 16 and the engagement hole 17 aligned with each other, the tip end portion of the set screw 18 screwed into the female screw hole 16 is fitted into the engagement hole 17, The female screw cylinder 15 is locked to one male screw shaft 11.
Further, the male screw shaft 12 is prevented from rotating with respect to the male screw shaft 11 because the convex portion 13 and the concave portion 14 are fitted to each other, and the outer thread 12 a is screwed into the female screw cylinder 15. As a result, the female screw cylinder 15 is also prevented from rotating around the other male screw shaft 12.

  The female screw hole 16, the engagement hole 17, and the set screw 18 form anti-rotation means 19 that prevents the female screw cylinder 15 from rotating around any one of the male screw shafts 11. It is possible to prevent the male screw shafts 11 and 12 from coming off and the male screw shafts 11 and 12 from being uncoupled.

  The engaging hole 17 may be omitted, and the tip of the set screw 18 may be pressed against the outer peripheral surface of the male screw shaft 11 to prevent the female screw cylinder 15 from rotating.

  As shown by broken lines in FIG. 1 and FIG. 2, the opposite end portions of the two male screw shafts 11 and 12 are formed with a convex portion 13 and a concave portion 14 that are orthogonal to the central axis L and are fitted to each other. A pin hole 20 that penetrates the pin hole 20 is provided. By fitting the pin 21 into the pin hole 20, the two male screw shafts 11 and 12 are not only connected by the female screw cylinder 15 but also by the pin 21. The two shafts 6 and 6 are firmly coupled by the double coupling means.

According to the first embodiment, since the screw threads 11a, 12a formed on the outer peripheral surfaces of the male screw shafts 11, 12 are screwed into the female screw cylinder 15, the male screw shafts 11, 12 are subjected to an external force in the axial direction. In addition to being firmly coupled to each other, the convex portion 13 and the concave portion 14 formed on the opposing end surfaces of the male screw shafts 11 and 12 are fitted to each other, and the abutting surfaces 13a and 14a are connected to the central axis L. Since they are in contact with each other in the rotational direction, they are firmly coupled to the rotational force around the central axis L.
In addition, the convex portion 13 and the concave portion 14 are formed on the opposing end surfaces of the two male screw shafts 11, 12, and they are abutted so that the female screw cylinder 15 is straddled over both the male screw shafts 11, 12. Since it is only necessary to screw the screw into the screw, the structure is simple and the connecting work can be easily performed.

3 and 4 show a second embodiment of the present invention. Note that the same or similar members as those in the first embodiment are denoted by the same reference numerals and are not shown in the drawings, and detailed descriptions thereof are omitted.
In the connecting means 30, that is, the connecting structure of the two male screw shafts 11 and 12, in the diametrical direction at one of the opposing end surfaces of the two male screw shafts 11 and 12, in this example, at the center of the end surface of the male screw shaft 11. A convex portion 31 having a rectangular shape facing the surface and a tip-like projecting shaft 32 projecting from the center of the front end surface thereof, and a concave portion forming a complement with the convex portion 31 on the end surface of the other male screw shaft 12 33 and a fitting hole 34 in which the protruding shaft 32 can be fitted by setting the inner diameter to be the same as or slightly larger than the outer diameter of the protruding shaft 32 is provided.

  The protruding amount T1 from the proximal end to the distal end of the projecting shaft 32 is larger than the protruding amount T2 from the proximal end to the distal end of the convex portion 31.

  Therefore, when the opposing end surfaces of the two male screw shafts 11 and 12 are butted, the tip-shaped protruding shaft 32 is inserted into the fitting hole 34 so that the male screw shafts 11 and 12 are easily aligned. Then, the convex part 31 and the concave part 33 can be easily fitted by rotating one male screw shaft 12 around the central axis L with respect to the other male screw shaft 11.

  After the opposite end surfaces of the male screw shafts 11 and 12 are butted against each other, the same thing as the female screw cylinder 15 in FIG. 1 is screwed so as to straddle the butted portions of the both male screw shafts 11 and 12. Since it is the same as that of embodiment, the detailed description is abbreviate | omitted.

  FIGS. 5-7 shows the usage example which used the 1st Embodiment of this invention shown in FIG. 1 and FIG. 2 for the connection means 10 of the main axis | shaft 8 and the additional axis | shaft 9 in a water turbine.

This water wheel is provided with a plurality of cylindrical unit tubes 1 facing in the left-right direction that are connected in a straight line and constitute a part of the water conduit A.
Each unit tube 1 has outward flanges 1a at both ends.

  A pair of unit tubes 1 and 1 adjacent to each other have their outward flanges 1a and 1a facing each other in contact with the left and right surfaces of the outer peripheral portion of the disc-shaped end plate 2 so that both outward flanges 1a and 1a are in contact. In a state where the end plate 2 is sandwiched therebetween, a plurality of bolts 3 penetrating the end plate 2 and nuts 4 screwed to the bolts 3 are connected to each other.

A bearing portion 2a provided with a bearing 5 as a ball bearing or a roller bearing is formed at the center of each end plate 2, and a plurality of water flow portions 2b having a fan shape or other shapes are formed at the outer periphery thereof. Has been.
Further, only the left and right surfaces of each end plate 2 or only one surface thereof (in the end plate 2 disposed on the outermost side of the series of unit tubes 1) are shortly fitted into the inner holes 1b of the unit tubes 1. A small fitting portion 2c is provided.

A shaft 6 facing in the left-right direction is pivotally supported on the bearing 5 of each end plate 2.
In this example, the shaft 6 is specifically a main shaft 8 integrally provided with a rotor 7 at an intermediate portion and one or a plurality of additional shafts 9 integrally provided with a rotor 7 at an intermediate portion. The end portions are butted together and are connected in a straight line with the connecting means 10 in the first embodiment.

  The main shaft 8 is rotatably supported at two left and right positions sandwiching the rotor 7 by bearings 5 and 5 at the center of a pair of adjacent end plates 2 and 2, and the additional shaft 9 is a single end plate 2. The rotor 7 provided on the additional shaft 9 is supported only by the bearing 5 at the center of the shaft, and the additional shaft 9 is connected to the main shaft 8 or another additional shaft 9 by the connecting means 10. A pair of end plates 2, 2 adjacent to each other are supported by both bearings 5, 5.

  The rotor 7 is formed by fixing a plurality of blades 7b on the outer periphery of the hub 7a fixed to the main shaft 8 or the additional shaft 9 with the inclined portion 7c at the tip thereof facing the upstream side (left side in FIG. 5). ing.

  The connecting means 10 is as described above, whereby the main shaft 8, the additional shaft 9, and the additional shafts 9, 9 are not only in the direction of the central axis L but also in the rotational direction around the central axis L. Are also firmly connected to each other.

  In this water wheel, when water is circulated from the left to the right in FIG. 5 in the water conduit A, each rotor 7 is rotated by the water flow at that time. 8 is transmitted to a hydraulic power utilization means (not shown), for example, a turbine (not shown) in a hydroelectric power generation device, etc., and used as a power source.

  Next, the procedure for adding the unit pipe 1 and the additional shaft 9 integral with the rotor 7 will be described.

  The rightmost first end plate 2 is fixed to the right end of the right first unit pipe 1 shown in FIG. 5, and the right end portion of the main shaft 8 is fitted to the center bearing 5 of the end plate 2. And the left end portion of the main shaft 8 is fitted to the bearing 5 in the center of the second end plate 2 so that the left end portion of the main shaft 8 protrudes to the left of the second end plate 2. The second end plate 2 is temporarily fixed to the left end of the first unit tube 1.

  Next, as shown in FIG. 7, the third end plate 2 is temporarily fixed to the left end portion of the second unit tube 1, and temporarily joined to the left end of the first additional shaft 9 with the center bearing 5. The auxiliary shaft 22 is fitted and pivoted, and the right end of the first additional shaft 9 protrudes to the right from the right end of the second unit tube 1 so that the first additional shaft 9 The vicinity of the right end is supported by the jig 23 disposed in the right end portion of the second unit tube 1 so as to be positioned at the center of the second unit tube 1.

  A male screw shaft 11 that is the same as the male screw shaft 11 provided at the left end of the main shaft 8 is provided at the left end of the first additional shaft 9, and the end surface of the male screw shaft 11 and a complementary shape are provided at the right end of the auxiliary shaft 22. An end surface that is the same as the right end surface of the male screw shaft 12 is formed, and the auxiliary shaft 22 is a first additional shaft by press-fitting the end surface to the left end surface of the first additional shaft 9. The shaft 9 is temporarily coupled to the left end.

  Next, as shown in FIGS. 1 and 2, one of a male screw shaft 11 provided at the left end of the main shaft 8 facing each other and a male screw shaft 12 provided at the right end of the first additional shaft 9 (shown in the figure). In the example, the female screw cylinder 15 is screwed onto the male screw shaft 11 side, and then the first additional shaft 9, the second unit tube 1, the third end plate 2, the auxiliary shaft 22, and the jig 23 are attached. The right end surface of the male screw shaft 12 that moves to the right as a unit and is provided at the right end of the first additional shaft 9 is provided at the left end of the main shaft 8 so that the convex portion 13 and the concave portion 14 are fitted to each other. Abutting on the left end surface of the male screw shaft 11, with the convex portion 13 and the concave portion 14 being completely fitted to each other, the pin 21 is fitted into the pin hole 20, and both male screw shafts 11, 12 are connected by the pin 21. To do.

  Thereafter, the female screw cylinder 15 is screwed to the left, and when the female screw cylinder 15 reaches a position where the female screw hole 16 and the engagement hole 17 are aligned, the screwing of the female screw cylinder 15 is stopped and the female screw hole 16 is stopped. The female screw cylinder 15 is prevented from rotating around the right male screw shaft 11 by fitting the tip end portion of the set screw 18 screwed into the engagement hole 17.

  The connecting operation of the main shaft 8 and the first additional shaft 9 can be performed using a gap formed between the first unit tube 1 and the second unit tube 1.

  After the connecting operation of the main shaft 8 and the first additional shaft 9 is completed, the jig 23 is removed from the second unit tube 1 and then the second unit tube 1 and the third end temporarily fixed thereto. The plate 2 is moved to the right in parallel with the first additional shaft 9 and the auxiliary shaft 22, and the left end portion of the first additional shaft 9 passes through the bearing 5 of the third end plate 2 to the left. After the protrusion, the auxiliary shaft 22 is removed from the first additional shaft 9, and the outward flange 1a at the right end of the second unit tube 1 is brought into contact with the left end surface of the second end plate 2 and then outward. The flange 1a and the outward flange 1a at the left end of the first unit tube 1 are coupled to each other with a bolt 3 and a nut 4 with the second end plate 2 interposed therebetween.

  Thereafter, the third and subsequent unit tubes 1 and the second and subsequent additional shafts 9 can be sequentially added in the same manner as described above.

  According to such a configuration, by incorporating the water turbine unit B as a part of the water conduit A, it is possible not only to easily provide a water wheel at an arbitrary location of the water conduit A, but also a part of the existing water conduit A. In place of this, instead of simply arranging and connecting the water turbine unit B in series with the cut portion, a water turbine can be easily provided at any location of the existing water conduit A, and the rotor The pair of end plates sandwiching the rotor 7 can stably support the rotor 7, and the pair of end plates 2 sandwiching the rotor 7 act as a reinforcing material for the unit tube 1, It is possible to prevent the tube 1 from being deformed by an external force.

  The relationship between the left end surface of the male screw shaft 11 provided at the left end of the first additional shaft 9 shown in FIG. 7 and the right end surface of the auxiliary shaft 22 in the second embodiment of the present invention shown in FIGS. When the relationship between the opposing ends of the two male screw shafts 11 and 12 is the same, the auxiliary shaft 22 is temporarily connected to the left end of the second additional shaft 9 so that the auxiliary shaft 22 is the left end of the first additional shaft 9. There is less risk of falling off.

The present invention is not limited to the first and second embodiments described above, and can be implemented in various modified forms without departing from the scope of the claims.
For example, instead of the set screw 18, the anti-rotation means 19 is a lock nut 35 that is screwed into one of the male screw shafts 11, 12 as shown by a two-dot chain line in FIGS. 1 and 2. As described above, after the female screw cylinder 15 is screwed so as to straddle the butted portions of both male screw shafts 11 and 12 in a state where the opposing end surfaces of both male screw shafts 11 and 12 are butted, the lock nut 35 is screwed into the female screw. The cylinder 15 may be press-contacted.
Further, when the set screw 18 and the lock nut 35 are used in combination, the female screw cylinder 15 can be more reliably prevented from rotating.

  The present invention can be applied not only to the water wheel in the hydroelectric generator as in the above use example, but also to any connecting structure that connects two male screw shafts or two shafts.

DESCRIPTION OF SYMBOLS 1 Unit pipe 1a Outward flange 1b Inner hole 2 End plate 2a Bearing part 2b Water passing part 2c Fitting part 3 Bolt 4 Nut 5 Bearing 6 Shaft 7 Rotor 7a Hub 7b Blade 7c Inclined part 8 Main shaft 9 Additional shaft 10 Connecting means 11 , 12 Male threaded shaft 11a, 12a Thread 13 Projection 13a contact surface 14 Recess 14a contact surface 15 Female thread cylinder 16 Female thread hole 17 Engagement hole 18 Set screw 19 Anti-rotation means 20 Pin hole 21 Pin 22 Auxiliary shaft 23 Jig 30 Connecting means 31 Convex part 32 Protruding shaft 33 Concave part 34 Fitting hole 35 Lock nut A Water guide pipe B Turbine unit L Center axis T1, T2 Protrusion

Claims (6)

  The opposing end surfaces of two male screw shafts having the same outer diameter and screw pitch and arranged in a straight line have contact surfaces that contact each other in the rotational direction around the central axis and are complementary to each other. Protrusions and recesses are opposed to each other, the threads formed on the outer peripheral surfaces of the male screw shafts are continuous with each other, and the convex parts and the recesses are fitted to each other so that the male screw shafts face each other. A connecting structure for two male screw shafts, wherein the male screw shafts are screwed together so that the end surfaces are butted and the male screw shafts straddle the butted portions.   2. The connection structure of two male screw shafts according to claim 1, further comprising a detent means for preventing the female screw cylinder from rotating on any one of the male screw shafts.   The rotation prevention means is screwed into a female screw hole facing the radial direction provided in the female screw cylinder, and the tip is pressed against the outer peripheral surface of one of the male screw shafts, or provided on the outer peripheral surface of one of the male screw shafts. 3. The connecting structure of two male screw shafts according to claim 2, wherein the set screw is adapted to be fitted into the engaging hole.   Providing a pin hole penetrating a convex part and a concave part that are perpendicular to the center axis of the two male screw shafts and that are fitted to each other, and fitting the pin into this pin hole The connection structure of two male screw shafts according to any one of claims 1 to 3.   At the center of one of the opposing end surfaces of the two male screw shafts, a pointed protrusion shaft is provided in which the protruding amount from the proximal end to the distal end is larger than the protruding amount from the proximal end to the distal end of the convex portion, and The connection structure of two male screw shafts according to any one of claims 1 to 4, wherein a fitting hole into which the protruding shaft can be fitted is provided in the center of an end surface facing the same.   Male screw shafts having the same outer diameter and screw pitch are provided at the end portions of the two shafts, the shafts are arranged in a straight line with each other, but are abutted, and the two male screw shafts that are abutted are claimed. Item 6. A connecting structure of two shafts, which is connected by a connecting structure of two male screw shafts according to any one of Items 1 to 5.

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