JP2013050197A - Oldham coupling spacer and oldham coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an Oldham coupling spacer which, when declination occurs between shafts to be coupled to an Oldham coupling, can tolerates the declination and can suppress bending moment generated based on a shaft reactive force, and to provide the Oldham coupling.SOLUTION: The Oldham coupling spacer 14 is interposed between two metal hubs 13 where a pair of projections 12 are formed in each opposing surface 11 by shifting a phase by 90°, and the projections 12 of both hubs 13 are fitted in the groove parts 15 of the metal spacer 14. In both end surfaces 14a of the spacer 14, a pair of projections 25 made of synthetic resins are formed at positions different from the groove parts 15 by a phase of 90°. The projections 25 are formed into T shape in section by shaft parts and head parts 25b. The shaft parts are buried in support holes recessed in the end surfaces 14a of the spacer 14, and the head parts 25b project from the end surfaces 14a of the spacer 14.

Description

  The present invention relates to a spacer and an Oldham coupling that are used in an Oldham coupling as a joint that transmits a power while sliding while a protrusion of a pair of hubs is fitted in a groove of a spacer interposed between the hubs.

  The Oldham coupling is used to connect the rotating shafts of rotating bodies provided in automobiles, pumps and the like. This Oldham coupling is composed of a pair of hubs formed with ridges, and a spacer interposed between both hubs and formed with groove portions in which the ridges of the hub are fitted.

  This type of Oldham coupling is disclosed in, for example, Patent Document 1. That is, the Oldham coupling is fitted with a sphere so that a part of the sphere can be freely rotated by being exposed from the fitting contact surface of the fitting protrusion (projection) of the fitting boss (hub) of the Oldham coupling. Fitting grooves (grooves) that are embedded in the mating protrusions and fit with the mating protrusions are arranged so as to intersect at right angles to both sides of the intermediate torque disk (spacer). According to this Oldham coupling, the fitting friction can be reduced by the point contact fitting through the freely rotating sphere.

JP 2008-185205 A

  By the way, in order to make the Oldham coupling highly rigid and withstand high torque, the spacer may be made of metal. In that case, when there is a declination between the shafts connected to the Oldham coupling, the hub and the outer diameter portion of the spacer interfere. For this reason, it is not allowed that a large deviation angle is generated between the axes, and the allowable deviation angle is small. Further, when both shafts are connected to the Oldham coupling in a state where there is a declination between the shafts, a bending moment due to the axial reaction force acts on the Oldham coupling.

  In the conventional configuration described in Patent Document 1, a plurality of spheres are arranged on the end surface and both side surfaces of the hub ridge facing the groove of the spacer. In the groove part, it cannot be rotated around the axis line orthogonal to the ridge part or around the axis line in the direction in which the ridge part extends. For this reason, when a declination exists between the shafts, the declination cannot be allowed, and a bending moment based on the axial reaction force acts on the Oldham coupling. Therefore, there is a demand for an Oldham coupling in which an allowable deflection angle is sufficient when a deflection angle exists between the shafts and a bending moment based on a shaft reaction force does not occur.

  The present invention has been made paying attention to such problems existing in the prior art, and the object of the present invention is to allow the deviation when the deviation occurs between the axes. Another object of the present invention is to provide an Oldham coupling spacer and Oldham coupling that can suppress the generation of a bending moment based on the axial reaction force.

  In order to achieve the above object, the Oldham coupling spacer according to the first aspect of the present invention is interposed between two metal hubs in which a pair of protrusions are formed by shifting the phase by 90 degrees on each facing surface. And an Oldham coupling spacer configured such that the protrusions of both hubs fit into the groove portions of the metal spacer, and at both end faces of the spacer, the groove portions are 90 degrees out of phase with each other. And a pair of protrusions formed of synthetic resin.

  An Oldham coupling spacer according to a second aspect of the present invention is the invention according to the first aspect, wherein the projection is formed in a T-shaped cross section by a shaft portion and a head portion, and the shaft portion is recessed on the end surface of the spacer. The head is embedded in the support hole, and the head protrudes from the end face of the spacer.

According to a third aspect of the present invention, in the invention according to the second aspect, the head of the protrusion is formed in a disc shape.
The Oldham coupling spacer according to a fourth aspect of the present invention is the invention according to any one of the first to third aspects, wherein the synthetic resin forming the protrusion is an engineering plastic.

  An Oldham coupling according to a fifth aspect of the present invention is a hub having the Oldham coupling spacer according to any one of the first to fourth aspects, and a ridge portion that fits into the groove portions of both end faces thereof. It is comprised by these.

According to the present invention, the following effects can be exhibited.
The Oldham coupling spacer of the present invention is interposed between two metal hubs in which a pair of ridges are formed by shifting the phase by 90 degrees on each facing surface, and the ridges of both hubs are made of metal spacers. It is comprised so that it may fit in a groove part. A pair of protrusions made of synthetic resin are provided on both end faces of the spacer at positions that are 90 degrees out of phase with the groove. For this reason, in the Oldham coupling in which hubs are assembled on both sides of the spacer, both hubs can rotate around a line passing through each of the pair of protrusions formed to protrude from both end faces of the spacer. Therefore, even if a declination exists between the axes connected by Oldham coupling, the declination can be allowed.

  Therefore, according to the Oldham coupling spacer of the present invention, when a deflection angle is generated between the shafts connected to the Oldham coupling, the deflection angle can be allowed and a bending moment based on the axial reaction force can be allowed. There exists an effect that generation | occurrence | production can be suppressed.

The disassembled perspective view which shows the Oldham coupling in embodiment of this invention. (A) is a front view which shows the Oldham coupling spacer, (b) is a front view which shows the Oldham coupling spacer of the state rotated 90 degree | times from the state of (a). The principal part sectional drawing which shows the state before inserting a protrusion in the support hole of the Oldham coupling spacer. Sectional drawing which shows an effect | action about Oldham coupling. Sectional drawing which shows an effect | action about the Oldham coupling of the state which rotated the Oldham coupling 90 degree | times from the state of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail with reference to FIGS.
As shown in FIGS. 1 and 4, the Oldham coupling 10 includes a metal Oldham between two metal hubs 13 each having a pair of protrusions 12 formed by shifting the phase of each facing surface 11 by 90 degrees. A coupling spacer (hereinafter simply referred to as a spacer) 14 is interposed, and the protrusions 12 of both hubs 13 are configured to fit into the grooves 15 of the spacer 14. Each hub 13 is formed in a C-ring shape and an insertion hole 16 is formed in the center thereof, and the spacer 14 is formed in a cylindrical shape and a through-hole 17 is formed in the center thereof. A shaft (rotary shaft) 18 is fitted into and connected to the insertion holes 16 of both hubs 13. As the metal that forms the hub 13 and the spacer 14, cast iron, steel (stainless steel), copper alloy, or the like is used.

  A slight gap 19 is formed between the ends of the C-ring of each hub 13, and a notch 20 is formed in the inner peripheral surface of each hub 13 in the extending direction of the gap 19. Further, a tightening operation hole 21 is opened on the outer peripheral surface of each hub 13, and a screw hole 22 is screwed into the tightening operation hole 21. A hexagon socket head bolt 23 is screwed into the screw hole 22 and tightened.

  Then, the two shafts 18 are fitted into the insertion holes 16 of the hub 13 from both sides of the Oldham coupling 10, and the hexagon socket head bolts 23 of both hubs 13 are tightened with a hexagonal bar spanner (not shown). Are connected by the Oldham coupling 10.

  As shown in FIGS. 1 to 3, a pair of support holes 24 having a circular hole shape are formed in both end surfaces 14 a of the spacer 14 at positions that are 90 degrees out of phase with the groove portion 15. A shaft portion 25a of a projection 25 made of a synthetic resin having a T-shaped cross section is embedded in the support hole 24 by a shaft portion 25a and a head portion 25b. It is comprised so that it may protrude from 14a. As the synthetic resin for forming the protrusions 25, engineering plastics such as polyacetal (POM), polyamide (PA), and polycarbonate (PC) having high mechanical strength and high heat resistance are preferably used.

  As shown by the one-dot chain line in FIGS. 4 and 5, the hubs 13 are slightly rotated around the line connecting the pair of protrusions 25 by the heads 25 b of the protrusions 25 protruding from the both end surfaces 14 a of the spacer 14. It can be moved. By such rotation of both hubs 13, even if there is a slight deviation in both shafts 18 connected to Oldham coupling 10, the deviation angle is allowed.

Next, the operation of the Oldham coupling 10 using the Oldham coupling spacer 14 configured as described above will be described.
Now, the Oldham coupling 10 is formed by disposing the hub 13 on both sides of the spacer 14 so that the protrusion 12 of the hub 13 fits into the groove 15 of the spacer 14. At this time, as shown in FIGS. 4 and 5, the pair of protrusions 25 are formed on both end surfaces 14 a of the spacer 14 so that the spacer 14 and the hubs 13 are not in close contact with each other. Between each of the hubs 13, a rotation space 26 having a width corresponding to the height of the head 25 b of the protrusion 25 is formed.

  When the shafts 18 are connected to the hubs 13 of the Oldham coupling 10, the shafts 18 are fitted into the insertion holes 16 of the hubs 13, and then the hexagon socket head bolts 23 of the hubs 13 are tightened with a hexagonal bar spanner. Thus, both shafts 18 are connected to both sides of the Oldham coupling 10. After connecting both shafts 18, there may be a declination between both shafts 18. In this case, in the Oldham coupling 10 of the present embodiment, the rotation space 26 is formed by the protrusions 25 formed on both end surfaces 14a of the spacer 14, and as shown by the one-dot chain line in FIG. One hub 13 can be slightly rotated around a line connecting a pair of protrusions 25 formed on the end surface 14a. Further, as shown by a one-dot chain line in FIG. 5, the other hub 13 can be slightly rotated around a line connecting a pair of protrusions 25 formed on the other end surface 14 a of the spacer 14. The rotation directions of these hubs 13 are different by 90 degrees.

Therefore, even if the shaft 18 connected to the Oldham coupling 10 is slightly deviated, it is possible to avoid a force based on the deflection angle of the shaft 18 acting on the Oldham coupling 10.
The effects exhibited by the embodiment described in detail above will be collectively described below.
(1) The Oldham coupling spacer 14 according to the embodiment is interposed between two hubs 13 each having a pair of ridges 12 formed by shifting the phase of each opposing surface 11 by 90 degrees, and the ridges of both hubs 13. 12 is configured to fit into the groove 15 of the spacer 14. A pair of synthetic resin protrusions 25 are provided on both end surfaces 14 a of the spacer 14 at positions that are 90 degrees out of phase with the groove 15. For this reason, in the Oldham coupling 10 in which the hub 13 is assembled on both sides of the spacer 14, the hubs 13 are 90 degrees around the line passing through each of the pair of protrusions 25 formed to protrude from both end surfaces 14 a of the spacer 14. Can rotate in different directions. Therefore, even if a declination exists between the shafts 18 connected by the Oldham coupling 10, the declination can be allowed.

Therefore, according to the Oldham coupling spacer 14 of the present embodiment, when the deflection angle is generated between the shafts 18 of the Oldham coupling 10 in which the hub 13 is assembled on both sides thereof, the deflection angle is allowed. In addition, it is possible to exhibit an effect that the generation of a bending moment based on the axial reaction force can be suppressed.
(2) The protrusion 25 is formed in a T-shaped cross section by the shaft portion 25a and the head portion 25b, the shaft portion 25a is embedded in the support hole 24 formed in the end surface 14a of the spacer 14, and the head portion 25b is formed in the spacer 14. It is comprised so that it may protrude from the end surface 14a. For this reason, the protrusion 25 can be easily formed of a synthetic resin, and the protrusion 25 having a desired thickness can be easily formed simply by embedding the shaft portion 25 a of the protrusion 25 in the support hole 24 of the spacer 14. .
(3) The head 25b of the protrusion 25 is formed in a disc shape. Therefore, the thickness of the protrusion 25 can be easily set to a constant value.
(4) The synthetic resin forming the protrusion 25 is engineering plastic. Accordingly, the protrusion 25 can exhibit excellent wear resistance and slipperiness, and can prevent seizure due to sliding of metals between the spacer 14 and the hub 13.
(5) The Oldham coupling 10 includes the spacer 14 and a hub 13 having protrusions 12 that fit into the groove portions 15 of both end faces 14a. For this reason, Oldham coupling 10 can exhibit the above-mentioned effect based on protrusion 25 of spacer 14.

It should be noted that the above-described embodiments may be modified as follows.
The head 25b of the projection 25 can be formed in an elliptical plate shape, a polygonal plate shape, or the like. Alternatively, the head 25b can be formed in an arc shape in cross section.

A plurality of the protrusions 25 may be arranged side by side on a line connecting the pair of protrusions 25.
A super engineering plastic such as polyphenylene sulfide (PPS) or polyether sulfone (PES) can be used as the synthetic resin for forming the protrusions 25.

  DESCRIPTION OF SYMBOLS 10 ... Oldham coupling, 11 ... Opposite surface, 12 ... Projection part, 13 ... Hub, 14 ... Oldham coupling spacer, 14a ... End face, 15 ... Groove part, 24 ... Support hole, 25 ... Projection, 25a ... Shaft part , 25b ... head.

Claims (5)

It is configured to be interposed between two metal hubs having a pair of ridge portions formed by shifting the phase by 90 degrees on each facing surface, and the ridge portions of both hubs fit into the groove portions of the metal spacer. Oldham coupling spacer,
An Oldham coupling spacer, characterized in that a pair of protrusions formed of synthetic resin are provided on both end faces of the spacer at positions 90 degrees out of phase with the groove. The protrusion is formed in a T-shaped cross section by a shaft portion and a head portion, the shaft portion is embedded in a support hole recessed in the end surface of the spacer, and the head portion is configured to protrude from the end surface of the spacer. The Oldham coupling spacer according to claim 1. The Oldham coupling spacer according to claim 2, wherein a head portion of the protrusion is formed in a disk shape. 4. The Oldham coupling spacer according to claim 1, wherein the synthetic resin forming the protrusion is an engineering plastic. 5. An Oldham cup comprising: the Oldham coupling spacer according to any one of claims 1 to 4; and a hub having protrusions that respectively fit into grooves on both end faces thereof. ring.

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