JP2000065081A - Part for flexible shaft coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase/uniformize joining strength, shorten work time, and reduce waste of a material by joining at least two or more shaft elements constituting an intermediate shaft on a contact plane vertical to a rotary shaft by frictional pressure contact. SOLUTION: A spacer 1 is composed of a part 2a composed of a great part of an intermediate shaft 2 and a part 3a composed of the intermediate flange part 3 and a part of the intermediate shaft 2. The parts 2a, 3a are separately formed of carbon steel by cutting work, the part 2a is advanced/contacted toward the rotating part 3a, and the parts 2a, 3a are pressed down in the rotary shaft direction while rotating the parts to be heated by frictional heat. Rotation of the part 3a is rapidly stopped, and is upset by increasing pressurizing force so that respective shaft elements are joined. Frictional pressure contact is performed for joining a raw material by deforming/melting the raw material, and since heating is uniform on a contact plane, joining is uniform, so that the distribution of residual stress is uniform. Thus, joining strength is large, reliability is enhanced, and since the heating is local, influence on the raw material is also reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission unit such as a fan, a rigid pump, a printing machine, a pump in general, a compressor, a blower, etc., which connects a drive shaft and a driven shaft to form a shaft. The present invention relates to a component for a flexible shaft coupling used to absorb corners.

[0002]

2. Description of the Related Art A flexible shaft coupling includes two opposing hubs, one of which is connected to a drive shaft and the other of which is connected to a driven shaft, a component for a flexible shaft coupling such as a spacer connecting the opposing hubs, The flexible shaft coupling component, which is disposed between the hub and the flexible shaft coupling component, and is configured at least from a flexible member for absorbing eccentricity and declination of the shaft by elastic deformation, the flexible shaft coupling component,
It is mainly composed of an intermediate shaft and flange portions provided at both ends of the intermediate shaft for holding the flexible member.

[0003] Conventionally, in the manufacture of such a component for a flexible shaft coupling, an intermediate shaft and flange portions at both ends of the intermediate shaft are formed as separate parts so that the intermediate shaft is composed of two or more shaft elements. The joints of the shaft elements are joined by fusion using silver wax or fusion by welding. Alternatively, the entire flexible shaft coupling component is manufactured by a cutting method.

[0004] In the welding using silver wax, since a different material such as silver wax is interposed in the joint portion, the distribution of the joining strength between the intermediate shaft and the flange portion is wide, and depending on the installation environment, the rotation may vary. During transmission, the reliability of the joint may decrease over time due to the load of torque. In addition, since the vicinity of the joint is heated to a high temperature (690 ° C. to 815 ° C.) over a wide range at the time of joining, the effect of the heat is great. May occur. In addition, fusion using silver wax requires a long work time because the work is performed manually, and the required accuracy in processing the joints is high, and productivity is increased due to an increase in the number of processes and a decrease in yield. Lower.

[0005] In welding by welding, since the welding material is melted by electrodeposition, the electrodeposited surface is not uniform, and a difference in residual stress locally occurs. Furthermore, although not as much as when using silver wax, the construction is still manual, so the construction time is long,
In addition, since the welding material is melted, the required accuracy at the time of processing the joint increases, and the productivity decreases due to an increase in the number of steps and a decrease in the yield. Further, if welding defects such as porosity, slag entrapment, presence of unwelded portions, cracks, and undercuts occur, the strength of the joint may be reduced.

The method of cutting out the entire part of the flexible shaft coupling by cutting, in particular, wastes a large amount of material of the intermediate shaft part, increases the amount of cutting, increases the processing time, and is disadvantageous in cost. is there. Also, it is difficult to apply to long parts.

[0007]

SUMMARY OF THE INVENTION The present invention can be manufactured by a method of joining each component, which is a method in which the strength of the joint is large, uniform and reliable, the processing time is short, and the material is not wasted. It is another object of the present invention to provide a component for a flexible shaft coupling having good workability in joining.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a flexible shaft coupling for connecting a driving shaft and a driven shaft, wherein the flanges of the opposite hub are connected so as to connect opposite hubs at both ends of the flexible shaft coupling. A flexible shaft coupling component mainly comprising an intermediate shaft, and flange portions provided at both ends of the intermediate shaft, wherein at least two or more shafts constituting the intermediate shaft An object is to provide a component for a flexible shaft coupling, in which elements are joined to each other by friction welding at their joining surfaces and are integrally formed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. 1 to 4 show a spacer as an example of an embodiment of a component for a flexible shaft coupling according to the present invention, and a flexible shaft coupling using the spacer. 1 is an external perspective view of a spacer, FIG. 2 is an external perspective view of a flexible shaft coupling using the spacer of FIG. 1, FIG. 3 is a sectional view of the flexible shaft coupling of FIG. 2 in the rotation axis direction, and FIG. FIG. 4 is a sectional view in the direction of the rotation axis showing a joint portion of FIG.

As shown in FIG. 1, the spacer 1 mainly comprises an intermediate shaft 2 in the form of a long pipe and intermediate flange portions 3 provided at both ends thereof. In the spacer 1, as shown in FIGS. 2 and 3, the intermediate flange portions 3, 3 are connected to two rotating shafts (a driving shaft and a driven shaft) (not shown) via flexible members 4, 4. The flexible shaft is opposed to the flange portions 5 and 5 of the opposing hub in the rotation axis direction of the intermediate shaft, and the intermediate flange portions 3 and 3 and the flange portions 5 and 5 of the opposing hub are fastened and fixed using bolts 6 and the like. Configure the joint.

As shown in FIG. 4, the spacer 1 includes a part 2a which is formed by cutting and constitutes most of the intermediate shaft 2, and a part which constitutes part of the intermediate flange 3 and the intermediate shaft 2. 3a, 3a. Therefore, the intermediate shaft 2 is composed of three shaft elements, and is integrally formed by joining the joint surfaces 7 of the shaft elements by friction welding. FIG. 5 shows a method of manufacturing the spacer 1 by friction welding using a brake-type welding machine. (1) Parts 2a and parts 3a are separately formed by cutting from carbon steel [FIG. 5 (a)]. (2) Each part is fixed, and the part 3a is rotated [FIG. 5 (b)]. The fixing member 8 for rotating the part 3a is connected to a drive system (not shown). (3) The part 2a is advanced toward the rotating part 3a, and is brought into contact with the part 3a (FIG. 5C). (4) With the part 3a being rotated, the part 2a and the part 3a are pressed in the direction of the rotation axis of the intermediate shaft, and heated by frictional heat [FIG. 5 (d)]. (5) The rotation of the part 3a is rapidly stopped using a brake, and simultaneously or simultaneously, the pressurizing force is increased and upset, and each shaft element is connected [FIG.
(E)]. (6) Thereafter, the fixing is released [FIG. 5 (f)].

In friction welding, materials to be joined are brought into contact with each other, and frictional heat is generated on a contact surface of the materials by a rotational motion (rotational speed N) under a constant pressure (P ₁ ), that is, mechanical energy. When the two materials are in an appropriate softened state, the rotation is stopped and the pressing force (P ₂ ) is applied. In the present invention, a generally used method such as a brake method or a flywheel method can be used as a specific pressure welding machine. Further, an improved one such as a two-axis rotation method or a constant phase (index) control method may be used.

In the brake system, one of the base materials is fixed so as not to rotate, and the other is mounted on a main shaft connected to a drive system and rotated at a constant speed while pressing both materials in the axial direction to frictionally. When the heat is generated and the friction portion is appropriately heated, the rotation of the spindle is rapidly stopped using a brake. At the same time or before or after that, the pressing force is further increased, and the two materials are connected by upsetting. In the flywheel type, one of the base materials is fixed so as not to rotate, and the other is mounted and rotated on a main shaft having a flywheel, and stores the rotational energy to rotate freely. When the two members are pressed in the axial direction, the rotational energy is consumed by the friction portion to generate frictional heat, the rotation is rapidly reduced, the spontaneous stop is performed, and the two members are joined.

In the friction welding, factors that are conditions for the pressure welding include a pressing force, a rotation speed, a combination of materials to be joined, a diameter of a joining surface of the materials, and the like. In addition, the size of the approach margin generated at the time of upset also has an effect. The size of the shift margin is regulated by the friction time during rotation and the friction shift margin. Also, because the bulging of the burrs is caused by the allowance,
It is necessary to control the number of revolutions and the like according to the state of generation of burrs.

In the friction welding, a material is deformed and melted by frictional heat to bond the materials. Since the heat generation is uniform on the joining surface, the joining is performed uniformly and the distribution of the residual stress is uniform. Therefore, the bonding strength is high and the reliability is high. Further, since the heat generation is local, the influence on the material is small.

In the present invention, the material constituting the part for a flexible shaft coupling is not particularly limited as long as it is a material capable of friction-welding each part (shaft element), and the same material is used for each part. Or different materials may be used. Therefore, the present invention can be applied not only to a metal material such as a steel material (stainless steel or the like) which has conventionally been used as a component for a flexible shaft coupling, but also to a plastic, a ceramic, or the like. The production of each part may be performed by a method generally used such as cutting. Further, the flexible shaft coupling component of the present invention is formed by joining at a cross section perpendicular to the rotation axis, and the joining is friction welding and the cross section is deformed. It may be lower than fusion using a wax or fusion by welding.

The above friction welding conditions may be appropriately set according to the material constituting the component for the flexible shaft coupling and the quality such as the desired joining strength.

[Other Embodiments] FIGS. 6 to 9 show a center spool which is another example of the embodiment for a flexible shaft coupling according to the present invention, and a flexible shaft coupling using the same. 6 is an external perspective view of the center spool, and FIG.
8 is an external perspective view of a flexible shaft coupling using the center spool of FIG. 8, FIG. 8 is a cross-sectional view of a main part showing a configuration of the flexible shaft coupling of FIG. 7, and FIG. It is.

As shown in FIG. 6, the center spool 11
Consists mainly of a short pipe-shaped intermediate shaft 12 and intermediate flange portions 13 provided at both ends thereof. As shown in FIG. 7 and FIG. 8, the center spool 11 has the intermediate flange portions 13
4 and adapters 20 and 20 and bolts 16 respectively.
To form one unit (center member). The unit comprises adapters 20, 2
0 is opposed to the flange portions 15 and 15 of the opposed hubs connected to two rotating shafts (a drive shaft and a driven shaft) (not shown) in the direction of the rotating shaft of the intermediate shaft. , 15 are fastened and fixed using bolts 16 ′, respectively, to form a flexible shaft coupling.

As shown in FIG. 9, the center spool 11 comprises a half-length intermediate shaft portion and an intermediate flange portion separately formed in advance by a cutting process, as in the above embodiment. It is composed of two parts 13a and 13a. Therefore, the intermediate shaft 12 is composed of two shaft elements, and is integrally formed by joining the joint surfaces 17 of the shaft elements by friction welding.
Hereinafter, the effects of the present invention will be described in more detail with reference to Test Examples and Examples.

Test Example 1. Test Method (1) Torsion Test at Friction Welding Site For the spacers of Example 1, Example 2, and Comparative Example 1, a torsional torque tester (TR-TR) as shown in FIG.
Using 20T (manufactured by Yonekura Seisakusho), a torsion test was performed on the joints, and the joint strengths were compared (joint strength of a conventional spacer was standard (△), and when the joint strength was larger than standard, ○). Note that the measurement of the torque is shown in FIG.
As shown in (1), a vertical load is applied to the specimen by a servo motor and a speed reducer (not shown), the load P is measured by the load cell at the load point, and the load torque is calculated from the moment arm length l by the equation T = P × l. Calculate T.

(2) RT inspection and MT inspection Regarding the spacer of the second embodiment, JIS Z 3104
In accordance with the radiation transmission test method for steel welded joints, the RT inspection was performed, and the spacers of Examples 1 and 2 were subjected to J
According to IS G0565 magnetic particle flaw detection test method of iron and steel material and classification of magnetic particle pattern, MT inspection was performed to confirm the quality as a product. (A product that meets the quality standard is marked with a circle.)

(3) Processing Time The time required for manufacturing was compared for the spacers of Example 1, Example 2 and Comparative Example 1 (Table 1 shows that the time required for manufacturing the spacer of Example 1 was 1 and the ratio was 1). In the display).

2. Table 1 shows the test results.

[0025]

EXAMPLE 1 Using carbon steel (STK400 of JIS G 3444 and S25C of JIS G 4051) as a raw material, a spacer similar to that of FIG. 1 was formed by cutting one spacer, mainly an intermediate shaft (530 mm in length, 530 mm in length). Outer diameter 60mm, thickness 2.3m
m) and two intermediate flanges (flange diameter 120 mm, shaft length 20 mm on the intermediate shaft side,
(Including a shaft outer diameter of 60 mm). Automatic friction welding machine (FF60-II type, FF80
-II type, FF45-II type, FF30-II type, etc.
Using Nitto Co., Ltd.) and applying a pressure of 10 kgf or more (several hundred k
gf level), rotation speed 1000-1800 rpm
Then, the joining surfaces as shown in FIG. 4 were joined to produce a spacer having the same shape as that of FIG.

Example 2 Carbon steel (S25C and S of JIS G 4051)
45C) as a raw material, by cutting, a spacer similar to that shown in FIG. 1 is formed into one part mainly including an intermediate shaft (length: 320 mm, outer diameter: 114 mm, thickness: 3.5 mm), and two intermediate flanges Each of the parts including a part (a flange part diameter of 200 mm, a shaft part length on the intermediate shaft side of 50 mm, and a shaft part outer diameter of 114 mm) was manufactured separately. By the same method as in Example 1, the bonding surfaces as shown in FIG. 4 were joined, and a spacer having the same shape as that in FIG. 1 was manufactured.

COMPARATIVE EXAMPLE 1 Using carbon steel (STK400 of JIS G 3444 and S25C of JIS G 4051) as a material, a spacer as shown in FIG.
Two parts mainly including the intermediate shaft (length 530 mm, outer diameter 60 mm, thickness 3 mm) and two intermediate flanges (flange diameter 110 mm, shaft length 45 on the intermediate shaft side)
(mm, shaft outer diameter 70 mm). After performing the black scale removal process of the intermediate shaft joint, the parts are combined by shrink fitting, and silver wax (JIS
While heating and melting Z3261 silver wax), silver wax was permeated into the joint between the intermediate shaft and the intermediate flange to join the joint, thereby producing a spacer as shown in FIG.

[0028]

The parts for a flexible shaft coupling according to the present invention are:
By the friction welding, the joining portions of the parts are joined uniformly and the distribution of the residual stress is uniform, so that the joining strength is high and the reliability is high. Therefore, the present invention can be applied to a device having a high load such as a torque. Further, since the heat generation is local, the influence on the material is small, thereby improving the reliability. Furthermore, unlike the welding performed by fusion using silver solder, the non-destructive inspection method (RT, PT, MT, etc.) of the joint can be performed by friction welding. Can perform appropriate strength evaluation and easily maintain product quality. Also, by joining each part by friction welding, it is possible to automate joining in the manufacturing process and good workability, reduce the number of machining steps including parts machining and joining, and reduce machining time. It is possible, and there is little waste of material. Further, since no auxiliary material is required and no special pretreatment is required, it is advantageous in terms of cost.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a spacer which is one embodiment of a part for a flexible shaft coupling according to the present invention.

FIG. 2 is an external perspective view of a flexible shaft coupling using the spacer of FIG. 1;

FIG. 3 is a sectional view in the rotation axis direction of the flexible shaft coupling of FIG. 2;

FIG. 4 is a sectional view in the rotation axis direction showing a joint portion of the spacer of FIG. 1;

5 (a) to 5 (f) show a method of manufacturing the spacer of FIG. 1 by friction welding using a brake type welding machine.

FIG. 6 is an external perspective view of a center spool which is another embodiment of the flexible shaft coupling part of the present invention.

FIG. 7 is an external perspective view of a flexible shaft coupling using the center spool of FIG. 6;

FIG. 8 is a cross-sectional view of a main part showing a configuration of the flexible shaft coupling of FIG. 7;

FIG. 9 is a sectional view in the rotation axis direction showing a joint portion of the center spool in FIG. 6;

FIG. 10 is a sectional view in the rotation axis direction showing a joint portion of a spacer which is a conventional component for a flexible shaft coupling.

FIG. 11 is a sectional view in the rotation axis direction of a center spool which is a conventional flexible shaft coupling part.

FIG. 12A is a diagram illustrating a configuration of a torsional torque tester, and FIG. 12B is a diagram illustrating a method of measuring torque.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Spacer (part for flexible shaft coupling) of the present invention 1 'Conventional spacer 2, 12, 2', 12 'Intermediate shaft 3, 13, 3', 13 'Intermediate flange part 4, 14 Flexible member 5, 15 Opposite hub 6, 16, 16 ′ Bolts 7, 17 Joining surface (joining portion) 7 ′ Silver brazing portion 8 Fixing member 9 Heating portion 11 Center spool of the present invention (part for flexible shaft coupling) 11 ′ Conventional center spool Reference Signs List 20 Adapter 30 Specimen (flexible shaft coupling part) 31 Joint 32 Base 33 Bearing 34 Load cell A Fixed side B Drive side

[Table 1]

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[Procedure amendment]

[Submission Date] July 16, 1999 (1999.7.1)
6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004] fused with the silver solder, since the silver brazing is interposed a different material to the joint, over time in some installation environment
In some cases, the reliability of the joint may decrease. Also, at the time of joining, a high temperature (690 ° C. to 815 ° C.)
(° C.), the heat effect is large, and particularly when the material of the component is austenitic stainless steel, the structure may be enlarged by heat and the corrosion resistance may be reduced. In addition, fusion using silver brazing requires a long work time because the work is performed manually, and the required accuracy when processing the joints is high, and productivity is increased due to an increase in the number of processes and a decrease in yield. Lower.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a flexible shaft coupling for connecting a driving shaft and a driven shaft, wherein the flanges of the opposite hub are connected so as to connect opposite hubs at both ends of the flexible shaft coupling. A flexible shaft coupling component mainly comprising an intermediate shaft, and flange portions provided at both ends of the intermediate shaft, wherein at least two or more shafts constituting the intermediate shaft An object is to provide a component for a flexible shaft coupling, in which the elements are joined by friction welding to each other on a joining surface having a cross section perpendicular to the rotation axis, and are integrated.

Claims (1)

[Claims] 1. A flexible shaft coupling for connecting a drive shaft and a driven shaft, wherein at least a flexible member is interposed between flange portions of the opposed hub so as to connect opposed hubs at both ends of the flexible shaft joint. A part for a flexible shaft coupling mainly comprising an intermediate shaft and flange portions provided at both ends of the intermediate shaft, wherein at least two or more shaft elements constituting the intermediate shaft are mutually joined at a joint surface thereof. A component for a flexible shaft coupling, which is joined by friction welding and is integrally formed.