JP2014206239A - Warping shaft joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a warping shaft joint of a new structure having an advantage such as easy assembling and disassembling.SOLUTION: A driving shaft side flange member 2, a rubber and disc-shaped intermediate element 3, and a driven shaft side flange member 4 are coaxially disposed in this order so as to contact with adjacent members. A bolt member 5 formed with a shaft portion 5a having no thread on a tip end side and formed with a thread on a head portion side of the shaft portion 5a is screwed in screw holes 2b and 3b of the driving shaft side flange member 2 and the driven shaft side flange member 4, and only the shaft portion 5a is inserted in a first bearing hole 3b and a second bearing hole 3c of the intermediate element 3. The intermediate element 3 is not coupled to the driving shaft side flange member 2 and the driven shaft side flange member 4.

Description

  The present invention relates to a flexible shaft coupling.

  In various torque transmission mechanisms, the ends of the two rotating shafts are connected by a joint. For example, an output rotation shaft of an engine or motor and an input rotation shaft of a pump are connected by a joint. In this case, it takes considerable effort to carefully install the engine, motor, and pump so that the output rotation shaft of the engine or motor and the input rotation shaft of the pump are sufficiently aligned. Moreover, even if the installation is performed with sufficient attention to such alignment, some eccentricity and declination remain between the two rotating shafts, and vibrations occur during operation of the engine, motor and pump. . In order to absorb these at the joint portion, conventionally, a flexible shaft joint using a flexible member such as a spring or rubber has been used.

  Various structures have been proposed as flexible shaft couplings, and a structure in which a coupling member on the driving shaft side and a coupling member on the driven shaft side are connected via a rubber and disk-shaped intermediate element is known ( For example, see Patent Documents 1 and 2).

JP 2004-60878 A JP 2005-127360 A

  However, in these conventional examples, the coupling member on the driving shaft side and the coupling member on the driven shaft side are respectively connected to the disk-like elastic intermediate element by bolts, so there is room for improvement in terms of ease of assembly and disassembly. It was.

  Accordingly, a main object of the present invention is to provide a flexible shaft coupling having a novel structure having advantages such as easy assembly and disassembly.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The first joint member, the rubber and disk-shaped intermediate element, and the second joint member are arranged coaxially in this order and adjacent to each other,
The intermediate element has a first bearing hole that opens at least on the first joint member side and a second bearing hole that opens at least on the second joint member side on a circumference of a predetermined radius centered on the central axis. A plurality of alternating and spaced apart in the circumferential direction,
The first joint member is formed with a screw hole penetrating in a direction parallel to the central axis at a position facing the first bearing hole of the intermediate element,
The second joint member is formed with a screw hole penetrating in a direction parallel to the central axis at a position facing the second bearing hole of the intermediate element,
A shaft portion without a thread is formed on the tip side, and a bolt member with a thread formed on the head side of the shaft is screwed into each screw hole of the first joint member and the second joint member. Only the shaft portion is inserted into the first bearing hole and the second bearing hole of the intermediate element,
The intermediate element is not connected to the first joint member and the second joint member by the bolt;
A flexible shaft coupling characterized by the above.

(Function and effect)
In the present invention, a bolt member having a thread portion formed on the distal end side and having a thread portion formed on the head side of the shaft portion is formed on each screw of the first joint member and the second joint member. Since it is screwed into each of the holes and only its shaft portion is inserted into each of the first bearing hole and the second bearing hole of the intermediate element, it is between the first joint member and the intermediate element, and between the intermediate element and the second joint. Transmission of driving force between the members is performed by engagement of the bolt member with the first bearing hole and the second bearing hole, respectively. Nevertheless, since the intermediate element is not connected to the first joint member and the second joint member by the bolts, assembly and disassembly are easy. Further, the bolt member is screwed into the screw holes of the first joint member and the second joint member, and a nut for fixing the bolt member is unnecessary.

<Invention of Claim 2>
The flexible joint according to claim 1, wherein a ring-shaped reinforcing material is attached to an outer peripheral surface of the intermediate element.

(Function and effect)
In the present invention, the driving force is transmitted between the first joint member and the intermediate element and between the intermediate element and the second joint member by engagement of the bolt member with the first bearing hole and the second bearing hole, respectively. The intermediate element is required to have higher deformation durability and shape maintenance. Therefore, it is desirable to attach the ring-shaped reinforcing material to the outer peripheral surface of the intermediate element as described above.

<Invention of Claim 3>
A cylindrical reinforcing liner shorter than a thickness of the intermediate element is fitted in the first bearing hole and the second bearing hole, and a shaft portion of the bolt member is inserted into the reinforcing liner. Item 3. The flexible joint according to Item 1 or 2.

(Function and effect)
In the present invention, the driving force is transmitted between the first joint member and the intermediate element and between the intermediate element and the second joint member by engagement of the bolt member with the first bearing hole and the second bearing hole, respectively. The bearing hole is required to have higher durability. In this case, it is desirable to fit a cylindrical reinforcing liner in the first bearing hole and the second bearing hole. However, the reinforcing liner comes into contact with the first joint member and the second joint member, which causes wear and noise. There is a fear. Therefore, as described above, it is desirable that the reinforcing liner be shorter than the thickness of the intermediate element.

  As described above, according to the present invention, there are advantages such as easy assembly and disassembly.

It is a disassembled perspective view of a bending shaft coupling. It is a perspective view of the assembly state of a bending shaft coupling. It is a left view of a bending shaft coupling. It is a right view of a bending shaft coupling. It is a side view of an intermediate element. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is an exploded perspective view of a flexible shaft coupling according to the present invention, and FIG. 2 is a perspective view of the assembled state. In these drawings, reference numeral 2 denotes a driving shaft side flange member corresponding to the first joint member of the present invention. The driving shaft side flange member 2 has a driving shaft mounting hole 2a provided concentrically, and an end of the driving shaft (not shown) is mounted in the driving shaft mounting hole 2a. Reference numeral 2x indicates the rotation center 2x of the driving shaft. Reference numeral 4 denotes a driven shaft side flange member corresponding to the second joint member of the present invention. The driven shaft side flange member 4 has a driven shaft mounting hole 4a provided concentrically, and an end of the driven shaft (not shown) is mounted in the driven shaft mounting hole 4a. Reference numeral 4x indicates the rotation center 4x of the driven shaft. Attachment of the driving shaft side flange member 2 to the driving shaft and attachment of the driven shaft side flange member 4 to the driven shaft are performed by appropriate means such as key coupling (illustrated form), spline coupling or other press fitting. The rotation center 2x of the driving shaft and the rotation center 4x of the driven shaft are coincident (concentric), and the driven side end surface of the driving shaft side flange member 2 and the driving side end surface of the driven shaft side flange member 4 are parallel to each other. It has become.

  Between the driving shaft side flange member 2 and the driven shaft side flange member 4, a rubber and disk-shaped intermediate element 3 is coaxially interposed. The intermediate element 3 has a first bearing hole 3b and a second bearing hole 3c penetrating in a direction parallel to the center axis 3x on the circumference of a predetermined radius centered on the center axis 3x. A plurality of them are alternately formed at a certain interval. In the illustrated example, the number of the first bearing holes 3b and the number of the second bearing holes 3c is four, but it is possible to reduce or increase the number as necessary. In the illustrated example, the first bearing hole 3b and the second bearing hole 3c are through holes. However, the first bearing hole 3b is only on the driving shaft side flange member 2 side, and the second bearing hole 3c is on the driven shaft. It may be a bottomed hole that opens only on the side flange member 4 side. Further, in the illustrated example, the first bearing holes 3b and the second bearing holes 3c are provided at equal intervals in the rotational direction, but may be provided at an uneven arrangement as necessary. Further, a through hole 3a having the same diameter as the driving shaft mounting hole 2a and the driven shaft mounting hole 4a is formed at the center of the intermediate element 3 in the illustrated form.

  On the other hand, the driving shaft side flange member 2 is formed with a screw hole 2b penetrating in a direction parallel to the central shaft 2x at a position facing the first bearing hole 3b of the intermediate element 3, respectively. The joint member is formed with a screw hole 4b penetrating in a direction parallel to the central axis 4x at a position facing the second bearing hole 3c of the intermediate element 3.

  Then, the shaft member 5a having no thread is formed on the tip side, and the bolt member 5 in which the thread 5b is formed on the head side of the shaft 5a includes the driving shaft side flange member 2 and the driven shaft side flange. Screwed into the screw holes 2b and 3b of the member 4, respectively, only the shaft portion 5a is inserted into the first bearing hole 3b and the second bearing hole 3c of the intermediate element 3, respectively. Further, since the bolt member 5 is screwed into only the driving shaft side flange member 2 or only the driven shaft side flange member 4 and is not screwed into the intermediate element 3, the intermediate element 3 is the driving shaft side flange member. 2 and the driven shaft side flange member 4 are not connected.

  In the bending shaft joint configured as described above, the rotational driving force input from the driving shaft to the driving shaft side flange member 2 is applied to the shaft portion 5a of the bolt member 5 screwed into the driving shaft side flange member 2. It is transmitted to the intermediate element 3 by sliding contact between the side surface and the inner peripheral surface of the first bearing hole 3 b of the intermediate element 3, and is deformed by deformation of the intermediate element 3, while being bent in the second bearing hole 3 c of the intermediate element 3. It is transmitted to the driven shaft side flange member 4 by sliding contact between the peripheral surface and the side surface of the shaft portion 5a of the bolt member 5 screwed into the driven shaft side flange member 4, and is transferred from the driven shaft side flange member 4 to the driven shaft. Is output. That is, a sudden change (starting or stopping of driving) of the rotational driving force input from the driving shaft is absorbed by the torsional change of the intermediate element 3 and transmitted as a smooth change.

  Further, when eccentricity, declination, or axial movement occurs between the driving shaft and the driven shaft, the intermediate element 3 is deformed accordingly, or the first bearing hole 3b and the second bearing hole 3c of the bolt member 5 are deformed. By changing the insertion depth, the driving force is transmitted while absorbing the influence.

  And although it is a flexible shaft coupling which functions in this way, since the intermediate element 3 is not connected with the 1st joint member and the 2nd joint member with the volt | bolt, an assembly and disassembly are easy. For example, when replacing the intermediate element 3, the bolt member 5 on the driving shaft side and the driven shaft side that supports the intermediate element 3 is removed, and the intermediate element 3 is pulled out radially outward. The bolt member 5 can be attached and the bolt member 5 can be attached, and the fixing of the driving shaft side flange member 2 to the driving shaft and the fixing of the driven shaft side flange member 4 to the driven shaft can be loosened and separated from each other. If the front end of the bolt member 5 is extracted from the intermediate element 3, the intermediate element 3 can be removed without removing the bolt member 5 from the driving shaft side flange member 2 and the driven shaft side flange member 4. Further, at the time of assembly or the like, the bolt member 5 is attached in advance to at least one of the driving shaft side flange member 2 and the driven shaft side flange member 4, and the bolt member 5 is attached to the corresponding bearing hole 3b of the intermediate element 3. , 3c can also be attached. Further, there is a secondary advantage that the bolt member 5 is screwed into the screw holes of the driving shaft side flange member 2 and the driven shaft side flange member 4 and a nut for fixing the bolt member 5 is not necessary.

  In the present invention, the transmission of the driving force between the driving shaft side flange member 2 and the intermediate element 3 and between the intermediate element 3 and the driven shaft side flange member 4 is transmitted between the bolt member 5, the first bearing hole 3b, and the second bearing hole 3c. Therefore, the intermediate element 3 is required to have higher deformation durability and shape maintainability. Therefore, it is desirable to attach the ring-shaped reinforcing material 6 to the outer peripheral surface of the intermediate element 3 as in the illustrated example. As long as it can reinforce the intermediate element 3, an appropriate material such as a metal ring, a resin ring, or a fiber-reinforced adhesive tape (wrapped around the outer peripheral surface of the intermediate element) can be used as the ring-shaped reinforcing material.

  For the same reason, higher durability is required for the bearing holes 3b and 3c in the present invention. In this case, it is desirable to fit the cylindrical reinforcing liner 7 in the first bearing hole 3b and the second bearing hole 3c, but the reinforcing liner 7, the driving shaft side flange member 2 and the driven shaft side flange member 4 are in contact with each other. There is a risk of wearing or abnormal noise. Therefore, as shown in the drawing, the cylindrical reinforcing liner 7 shorter than the thickness of the intermediate element 3 is fitted into the first bearing hole 3b and the second bearing hole 3c, and the shaft portion 5a of the bolt member 5 is inserted into the reinforcing liner 7. It is a preferable form to have a structure to be inserted into the inside. As the reinforcing liner 7, a material made of an appropriate material such as a metal or a resin can be used as long as it can reinforce the bearing holes 3 b and 3 c of the intermediate element 3.

  The present invention can be used for a flexible shaft coupling.

  2 ... Driving shaft side flange member, 2a ... Driving shaft mounting hole, 2x ... Rotation center of driving shaft, 3 ... Intermediate element, 3a ... Through hole, 3b ... First bearing hole, 3c ... Second bearing hole, 3x ... Center Axis, 4 ... driven shaft side flange member, 4a ... driven shaft mounting hole, 4x ... rotation center of driven shaft, 5 ... bolt member, 5a ... shaft portion, 6 ... ring-shaped reinforcing material, 7 ... reinforcing liner.

Claims (3)

The first joint member, the rubber and disk-shaped intermediate element, and the second joint member are arranged coaxially in this order and adjacent to each other,
The intermediate element has a first bearing hole that opens at least on the first joint member side and a second bearing hole that opens at least on the second joint member side on a circumference of a predetermined radius centered on the central axis. A plurality of alternating and spaced apart in the circumferential direction,
The first joint member is formed with a screw hole penetrating in a direction parallel to the central axis at a position facing the first bearing hole of the intermediate element,
The second joint member is formed with a screw hole penetrating in a direction parallel to the central axis at a position facing the second bearing hole of the intermediate element,
A shaft portion without a thread is formed on the tip side, and a bolt member with a thread formed on the head side of the shaft is screwed into each screw hole of the first joint member and the second joint member. Only the shaft portion is inserted into the first bearing hole and the second bearing hole of the intermediate element,
The intermediate element is not connected to the first joint member and the second joint member by the bolt;
A flexible shaft coupling characterized by the above.   The flexible joint according to claim 1, wherein a ring-shaped reinforcing material is attached to an outer peripheral surface of the intermediate element.   A cylindrical reinforcing liner shorter than a thickness of the intermediate element is fitted in the first bearing hole and the second bearing hole, and a shaft portion of the bolt member is inserted into the reinforcing liner. Item 3. The flexible joint according to Item 1 or 2.

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