JP4356937B2 - Oldham fitting - Google Patents

Description

  The present invention relates to an Oldham coupling that transmits power by correcting a deviation of the axis of a corresponding shaft.

  As a means for transmitting power while correcting the deviation of the axis of the corresponding shaft, an Oldham coupling used by being arranged between a drive shaft and a driven shaft is known. The Oldham coupling has the advantage that power can be transmitted without changing the angular velocity due to the sliding action of the fitting portion even when the shaft center is slightly displaced on the driving side and the driven side. In order to draw out such advantages, a minute gap is provided in each fitting portion between the Oldham joint and both shafts.

Here, if the Oldham coupling is entirely made of metal, an impact is generated or a hitting sound is generated during power transmission due to backlash caused by the gap. An Oldham joint that requires quietness may be entirely composed of a synthetic resin or the like, but in such a case, the transmission force is limited. Alternatively, there is a concern about early wear on the sliding surface to be fitted . That is, transmission performance and durability are problems.

In order to solve the above problems, an Oldham joint that has high durability and is unlikely to generate hitting sound has been proposed (see Patent Document 1).
In the proposed Oldham coupling, a pair of recesses having different phases are provided at both ends of the metal joint body, and a synthetic resin member having a fitting recess is further press-fitted into the recesses. The fitting convex portions formed at the end portions are fitted into the corresponding fitting concave portions, and the corresponding power transmission surfaces are configured to transmit power while sliding with each other.

  However, in such a proposal, when a synthetic resin fitting recess is further press-fitted into a metal recess, a special press-fitting tool is required, and the power transmission surfaces slide with a large force between each other. There is a concern that the synthetic resin member may be peeled off from the metal recess. Furthermore, the synthetic resin member is eventually replaced, and the replacement work requires the use of the press-fitting tool again, which requires a lot of man-hours for maintenance.

  In addition to the above, as shown in FIG. 12, the pair of first joint members 1J and 1J formed with the protrusions 4J and the pair of first joint members 1J and 1J at positions sandwiched between the pair of first joint members 1J and 1J. There is an Oldham joint 100J composed of a first joint member 1J, 1J, and a second joint member 10J formed with grooves 12J (four locations with the same diameter) for forming sliding pairs.

In the second joint member 10J of the Oldham joint 100J, through holes 16J are formed at four locations near the outer periphery.
The through hole 16J is inserted with a shaft portion 22J of a buffer member 20J which is entirely made of synthetic resin and includes a head portion 21J and a shaft portion 22J.
The head portion 21J has an outer diameter larger than that of the shaft portion 22J, and the head portion 21J is interposed between the end face of the first joint member 1J and the end face of the second joint member 10J, so that the first joint It is comprised so that the direct collision with the end surface of the member 1J and the end surface of the 2nd coupling member 10J may be prevented.

However, although the Oldham coupling shown in FIG. 12 avoids the collision between the joint members, the tapered rotating shaft 41J of the driven side 40J is moved from the rotating shaft fitting taper hole (not shown) of the first joint member 1J. When removing, a normal disassembly puller is required.
A normal disassembling puller is composed of a plurality of parts, is large as a whole, has a large mass, and is particularly difficult to work in a narrow place.
In FIG. 12, reference numeral 50J denotes a driving side, and reference numeral 51J denotes a tapered rotating shaft on the driving side.
JP-A-7-155249

  The present invention has been proposed in view of the above-described problems of the prior art, and a pair of first joint members formed with ridges or grooves, and a position sandwiched between the pair of first joint members. In an Oldham joint comprising a pair of first joint members and a second joint member formed with a groove or a ridge for forming a sliding pair, the hammer is driven by a collision between the joint members. The purpose is to provide an Oldham coupling that avoids the generation of noise and significantly improves workability during disassembly.

  According to the present invention, the pair of first joint members 1, 1 in which ridges (sliding projections) 5 or grooves are formed, and the pair of first joint members 1, 1 at a position between the pair of first joint members 1, 1. In the Oldham coupling composed of the first joint member 1, the protrusion 5 or groove of the first joint member 1, and the groove (notch) 12 for forming a sliding pair, or the second joint member 10 forming a protrusion, respectively, The pair of first joint members 1 and 1 have a taper shaft 52 constituting a rotation shaft 41 of a driven-side device 40 or a taper shaft 52 constituting a rotation shaft 51 of a driving-side device 50 at a rotation axis center C, respectively. The end 4 on the large-diameter side facing the second joint member 10 of the pair of first joint members 1, 1 is formed in an annular shape and flat, Penetrates from the end 4 to the outer periphery 2 at a position facing the rotation axis C of the part 4 A pair of through-holes 8 and 8 is provided, and an internal thread 8a is formed on the inner periphery of the through-hole 8, and the end surfaces 4 and 4 of the pair of first joint members 1 and 1 and the second joint member A buffer member 20 is sandwiched between 10 opposing surfaces 14, 14, and a shaft portion 22 of the buffer member 20 is inserted into and supported by the through hole 8.

  According to the present invention, the number of protrusions 5 or grooves formed on one member of the pair of first joint members 1 and 1 is two, and grooves formed on the second joint member 10. The total number of twelve or protrusions is four.

  According to the present invention, at least the sandwiched member 21 of the buffer member 20 is an elastic member made of synthetic resin.

According to the Oldham coupling (100) of the present invention having such a configuration, the buffer member (20) is interposed between the first coupling member (1) and the second coupling member (10). Therefore, the generation of hitting sound due to the collision between the joint members (1, 10, 1) is avoided.
Moreover, if synthetic resin is used for the material of the buffer member (20), the effect is further enhanced.

  When disassembling the Oldham joint (100), the female threaded portion (8a) of the through hole (8) of the first joint member (1) housing the shaft portion (22) of the buffer member (20) is used. The disassembling operation can be performed simply by screwing the male thread portion (63) of the disassembling tool.

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

FIG. 1 is a side view of an Oldham joint which is shown as a whole by reference numeral 100 and functions as a joint, and FIG. 2 is a perspective view showing a state in which the Oldham joint 100 is disassembled.

  1 and 2, Oldham joint 100 includes a pair of first joint members 1, 1, a second joint member 10, a pair of first joint members 1, 1, and the second joint member 10. A total of four elastic members 20 interposed between the opposing surfaces (end portions) 4 and 14 (the surfaces 4 and 14 will be described in detail later).

As shown in detail in FIGS. 3 and 4, the first joint member 1 has an outer shape of a funnel shape in the illustrated example.
That is, the outer periphery 2 side is formed in a two-step taper shape.

  The inner periphery 3 side of the first joint member 1 is recessed in a two-step taper shape in the illustrated example, and a seat surface 3a that abuts a seat surface of a lock nut described later is formed on the bottom thereof.

    An end portion (right end surface) 4 on the large diameter side in the axial direction (left-right direction in FIG. 3) of the first joint member 1 is formed in an annular shape and flat as a whole, and an axial center C of the end portion 4 is defined. At positions facing each other (see FIG. 4), there are two surfaces 5a parallel to the central axis CL (see FIG. 3), and two slide projections 5 are formed so as to protrude from the end portion 4. .

  In the vicinity of the slide protrusion 5 at the end portion 4, through holes 8 are provided at two positions so as to penetrate from the end portion 4 to the outer periphery 2 side at positions facing each other with the shaft center C therebetween (see FIG. 4). Is formed.

  A region between the end surface 2e including the end portion on the small diameter side of the outer periphery 2 of the first joint member 1 and the seat surface 3a which is the bottom portion on the inner diameter side 3 functions as the rotation shaft 6. A taper shaft hole 7 having a large diameter side on the end face 2e side is formed through the rotation shaft 6 at the center of the shaft.

1 and 2, in the illustrated example, a taper shaft 42 constituting a rotating shaft 41 of the driven-side device 40 is adjacent to the left side of the first joint member 1 on the left side. And is fixed by a lock nut 30. Further, on the right side of the first joint member 1 on the right side, a taper shaft 52 constituting the rotary shaft 51 of the drive-side device 50 is fitted into the taper shaft hole 7 of the first joint member 1, and a lock nut 30 (see also FIG. 5).
In FIG. 2, reference numeral 9 denotes a key for preventing slippage interposed in a key groove (not shown) of the taper shafts 42 and 52.

FIG. 5 is a cross-sectional view showing in detail the fitting between the rotating shaft 41 of the driven device 40 and the tapered shaft hole 7 of the first joint member 1.
The rotary shaft 41 is configured integrally with a taper shaft 42 and a straight male screw portion 44 with a constricted portion 43 interposed therebetween. The lock nut 30 with a seat is screwed into the male screw portion 44 and fastened with a predetermined tightening torque. Then, a so-called “wedge effect” occurs between the taper shaft 42 and the taper shaft hole 7, and a strong force is generated between each taper surface and the seat surface 30 a of the lock nut 30 and the seat surface 3 a of the first joint member 1. A strong fastening force is generated.

  An escape hole 7 a for preventing interference with the male screw 44 is formed at the small diameter side end of the tapered shaft hole 7.

  Next, the second connecting member 10 will be described in detail with reference to FIGS. 6 and 7. The second connection member 10 has a circular shape having a uniform thickness. A cutout 12 that accommodates the slide projection 5 of the first connecting member 1 is formed at a position that divides the circumference 11 into four equal parts in a portion including the circular outer circumference 11.

  The slide surface 12a extending outward of the radius of the notch 12 is tight enough not to cause “backlash” with the slide projection 5, but can slide smoothly with the slide surface 5a of the slide projection 5. It is configured.

  A through hole 13 for escaping the lock nut 30 (see FIG. 5) is formed in the center of the second connecting member 10. The two circular surfaces 14 are finished smoothly, and the two circular surfaces 14 are assembled so as to face the end portion (end surface) 4 of the first joint member 1.

  The pair of first joint members 1 and the central second joint member 10 are provided with a predetermined gap at the beginning of assembly on the surfaces facing each other in order to allow movement in the axial direction, which is a characteristic of the Oldham joint. S (see FIG. 1) is secured. However, the gap S decreases or increases when driving as a joint. As an extreme example at the time of reduction, if left as it is, the first joint member 1 and the center second joint member 2 will collide, so that a hitting sound (abnormal noise) is generated and badly damaged. It becomes.

  FIG. 8 shows the first joint member 1 in order to avoid collision between the first joint member 1 and the second joint member 10 in the center and to suppress the occurrence of noise (abnormal noise). It is a side view of the buffer member 20 pinched | interposed between the center 2nd coupling members.

As shown in FIG. 8, the buffer member 20 includes a head 21 that is a portion sandwiched between the opposed surfaces 4 and 14 of the first joint member 1 and the second joint member 10 and the head thereof. The shaft portion 22 having a diameter smaller than that of the portion 21 is integrally formed by an elastic member made of synthetic resin.
In addition, after making the head part 21 and the axial part 22 by another body, it can also be assembled | attached and integrated by a well-known means. When the head portion 21 and the shaft portion 22 are made separately, at least the head portion 21 is preferably made of synthetic resin.

  When the outer diameter of the shaft portion 22 of the buffer member 20 is formed substantially the same as the inner diameter of the through-hole 8 of the first joint member 1 (internal thread thread system), and assembled as a shaft joint (Oldham joint) 100 The shaft portion 22 is inserted into the through hole 8.

  The through-hole 8 formed in the first joint member 1 is used for disassembling the joint, that is, for example, pulling the tapered shaft 42 of the driven device 40 from the tapered shaft hole 7 into the tapered shaft hole 7. It plays a big and extremely effective role in unplugging.

  FIG. 9 is an example showing an aspect during such disassembly.

  Two pulling bolts 60 are prepared as disassembly tools. The pull-out bolt 60 includes a head 61, a neck lower shaft portion 62 adjacent to the head 61, and a male screw forming portion 63 ahead of the neck lower shaft portion 62.

  The male screw formed in the male screw forming portion 63 of the drawing bolt 60 is configured to be screwed with the female screw 8 a formed in the through hole 8 of the first joint member 1.

  In disassembling, first, the lock nut 30 is loosened, and the lock nut 30 is removed from the male thread portion 44 of the taper shaft 41 (see FIG. 5).

  Subsequently, the male screw formed in the male screw forming portion 63 of the first drawing bolt 60 is screwed with the female screw 8a formed in the through hole 8 of the first joint member 1 (see FIG. 9), and the end of the male screw The portion 63a is screwed in until it comes into contact with, for example, the vertical surface 40v of the driven device 40. Next, the same operation is performed with the second drawing bolt 60.

  Subsequently, the two drawing bolts 60 are simultaneously tightened at a fine pitch. Alternatively, if it is impossible to tighten at the same time, the pitch is alternately occupied with a fine pitch. Then, the taper shaft 42 that has bitten into the taper shaft hole 7 is easily detached from the taper shaft hole 7.

FIG. 10 is a state diagram showing an example of disassembly when the obstacle 70 exists in the vicinity of the outer periphery of the Oldham coupling 100.
The Oldham coupling is normally disassembled by using a puller (not shown) and hooking the end of the hook-shaped member of the puller that protrudes radially outward from the outer periphery 2 on the outer periphery 2 side of the first joint member 1. However, in this embodiment in which the periphery is surrounded by an obstacle as shown in FIG. 10, the drawing bolt 60 does not exist outside the outer periphery 2 of the first joint member 1.
Therefore, in the disassembling work, the disassembling work can be performed even if the obstacle 70 as shown in FIG. 10 is arranged so as to surround the joint.

FIG. 11 shows another embodiment showing a mode at the time of disassembly.
In the disassembly example of FIGS. 9 and 10, disassembly could be performed using only two pulling bolts 60.
In contrast, the disassembled embodiment of FIG. 11 has the same configuration as the extraction bolt 60 used in FIGS. 9 and 10, but includes two short extraction bolts 60 </ b> A having male threads and a disk-shaped extraction tool 80. And an example of disassembly using one of the pull-out operation bolts 60B.

  Although not clearly shown in the drawing, the disk-shaped drawing tool 80 has two through holes 80a in the vicinity of the outer periphery at two locations at the same pitch as the through holes 8 formed in the first joint member 1. A female screw 80 b is formed at the center of the tool 80.

The diameter of the through hole 80a is slightly larger than the diameter of the neck lower shaft portion and the male screw forming portion of the drawing bolt 60A, but is smaller than the diameter of the pressure receiving seat surface provided in the bolt head.
The drawing operation bolt 60B includes a head 61B, a neck lower shaft portion 62B, and a male screw forming portion 63B. The male screw 63B is configured to be screwed with a female screw 80b formed at the center of the disk-shaped extraction tool 80.

  When disassembling, first, two extraction bolts 60A are inserted into two through holes 80a of the disk-shaped extraction tool 80, and a male screw formed at the through hole 8 of the first joint member 1 with a male screw portion at the tip of the bolt 60A. Screw into 8a. Next, the drawing operation bolt 60B is screwed with a female screw 80b formed at the center of the disk-like drawing tool 80, and the tip 64B of the drawing operation bolt 60B is connected to the taper shaft 42 of the driven-side device 40. After making contact with the tip, it is further screwed. Then, the taper shaft 42 that has bitten into the taper shaft hole 7 is easily detached from the taper shaft hole 7.

  According to the embodiment having the configuration as described above, the buffer member 20 is interposed between the first joint member 1 and the second joint member 10, and the material of the buffer member 20 includes Since synthetic resin is used, it is possible to avoid the occurrence of sound (abnormal noise) due to the collision between the joint members 1, 10, 1.

  When disassembling, in one embodiment (FIG. 9), the internal thread portion 8a of the through hole 8 of the first joint member 1 that houses the shaft portion 22 of the buffer member 20 is used, and the number is small. The disassembly work can be easily performed only by screwing the drawing bolt 60 which is a tool having a simple structure.

  Alternatively, in another disassembled embodiment (FIG. 11), by using the disk-shaped rear portion 80 and the pull-out operation bolt 60B having a simple structure in addition to the pull-out bolt 60A, it is as simple as the disassembled embodiment in FIG. Can be disassembled.

  For example, even if the Oldham joint 100 is surrounded by obstacles as shown in FIG. 10, the radial area required for the work can be narrow, so the joint installation location is not limited.

  The illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention. For example, a protrusion (sliding protrusion) is provided on the second joint member side, and a groove (notch) is provided. 1 can also be provided on the joint member side.

The side view which showed the assembly state of the whole coupling of embodiment of this invention. The exploded assembly figure of the Oldham coupling of the embodiment of the present invention. The side view of the 1st coupling member which concerns on embodiment of this invention. The front view corresponding to FIG. The partial sectional view concerning this embodiment and showing the fitting state of the axis on the equipment side and the shaft hole on the joint side. The side view of the 2nd coupling member which concerns on embodiment of this invention. The front view corresponding to FIG. The side view of the buffer member concerning the embodiment of the present invention. The state figure which showed the disassembly work which is one Example which concerns on embodiment of this invention. FIG. 10 is a state diagram illustrating a case where there are obstacles in the vicinity. The state figure which showed the disassembly work which is another Example which concerns on embodiment of this invention. The exploded assembly figure of the Oldham coupling by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 1st coupling member 2 ... Outer periphery 3 ... Inner diameter side 4 ... End part 5 ... Slide protrusion 6 ... Rotating shaft 7 ... Tapered shaft hole 8 ... Through Hole 8a ... Female thread 10 ... Second joint member 11 ... Outer periphery 12 ... Groove / notch 13 ... Through hole 14 ... Two circular surfaces 20 ... Buffer member 21 ..Head 22 ... shaft 30 ... lock nut 40 ... driven device 41 ... rotary shaft 42 ... taper shaft 44 ... male screw 50 ... drive side Equipment 60 ... Pull-out bolt 70 ... Obstacle 100 ... Oldham joint

Claims (3)

A pair of first joint members (1, 1) formed with protrusions (5) or grooves, and the pair of first joint members at positions sandwiched between the pair of first joint members (1, 1) In the Oldham coupling composed of the protrusion (5) or the groove (1) of (1, 1) and the second joint member (10) formed with a groove (12) or a protrusion for forming a sliding pair, respectively, The pair of first joint members (1, 1) are respectively provided with a taper shaft (42) or a drive side device (50) constituting a rotation shaft (41) of the driven side device (40) at the rotation axis center (C). ) And the second joint member (10) of the pair of first joint members (1, 1). ) And the large-diameter end (4) opposite to each other are formed in an annular shape and flat, and the rotation axis center (C) of the end (4) is sandwiched between them. A pair of through holes (8, 8) penetrating from the end (4) to the outer periphery (2) are provided at opposing positions, and an internal thread (8a) is formed on the inner periphery of the through hole (8). A buffer member (20) is sandwiched between the end surfaces (4, 4) of the pair of first joint members (1, 1) and the opposing surfaces (14, 14) of the second joint member (10). An Oldham coupling characterized in that the shaft (22) of the buffer member (20) is inserted and supported in the through hole (8). The number of protrusions (5) or grooves formed on one member of the pair of first joint members (1, 1) is two, and grooves (12 formed on the second joint member (10)). The Oldham joint according to claim 1, wherein the total number of protrusions is four. The Oldham coupling according to claim 1, wherein at least the clamped member (21) of the buffer member (20) is an elastic member made of synthetic resin.

Images