JP2007247859A - Shaft coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent relative rotation, relative to a rotation member, of a boot for holding lubricant in a shaft coupling which transmits power via rolling elements provided at a crossing point of guiding grooves mutually perpendicularly crossing between two parallel shafts. <P>SOLUTION: At a boot pinching surface of an output side plate (a rotation member) 2 for pinching an end of an outer boot 8 and an inner boot 9 with a pressing plate 10, an annular grooves 2a, 2b and diameter direction grooves 2c, 2d extending from these annular grooves 2a, 2b in a plate diameter direction are provided and fitting parts 8a, 9a for fitting with the annular grooves 2a, 2b and the diameter direction grooves 2c, 2d are provided at ends of the respective boots 8, 9 Thus, both relative movement and relative rotation in the diameter direction, relative to an output side plate 2, of the respective boots 8, 9 are restrained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shaft coupling that couples two parallel shafts to transmit power between the two shafts.

  A shaft joint that connects two shafts of a general mechanical device and transmits power from the drive side to the driven side has a different structure depending on the positional relationship between the two shafts to be connected. And those that are parallel to each other (and not concentric).

As a shaft coupling for connecting two parallel shafts, the present applicant proposes a method for transmitting power via rolling elements arranged at the intersections of guide grooves orthogonal to each other between the two parallel shafts. (See Patent Document 1).
JP 2005-172217 A

  FIG. 5 shows an example of the above-described type of shaft coupling. In this shaft coupling, a plurality of guide grooves 53 and 54 are provided on the opposing surfaces of the two rotating members 51 and 52 that face each other in the axial direction so as to be orthogonal to the guide groove on the other side. The rolling elements 55 are arranged at positions, and the respective rolling elements 55 are accommodated in the long holes 57 of the cage 56, and the rolling elements 55 are restrained from moving in the radial direction of the rotating member by the cage 56. By being pushed by the driving-side rotating member 51, the driven-side rotating member 52 is pushed to transmit power while rolling inside the guide holes 53 and 54 and the long hole 57 of the retainer 56. FIG. 5 shows a state in which both the rotating members 51 and 52 are concentric for the sake of explanation, but normally, they are used in a state in which the rotational axes of both are shifted (eccentric).

  By the way, in this type of shaft coupling, as shown in FIG. 5, the space between the rotating members 51 and 52 is closed with the outer boot 58 and the inner boot 59 attached to the rotating members 51 and 52. Thus, a lubricant such as grease is held inside the joint to reduce friction and suppress wear on the contact surface between the guide grooves 53 and 54 and the cage 56 and the rolling element 55, and to prevent foreign matter from entering from the outside of the joint. It is desirable to prevent.

  Each of the boots 58 and 59 is usually formed in an accordion shape with an elastomer such as rubber, and the central portion thereof is elastically deformed following the eccentricity of the rotating members 51 and 52. One end portion is sandwiched between one rotating member 52 and a boot press plate 60 attached to the outer surface thereof, and the other end portion is provided with annular attachment members 61 and 62 to which this portion is baked and bonded. And is press-fitted into the outer periphery and the inner periphery of the other rotating member 51.

  Here, as shown in FIG. 6, the outer boot 58 has an annular portion 58 a that protrudes on both sides in the axial direction at one end, and the annular portion 58 a serves as one of the rotating member 52 and the boot pressing plate 60. The radial movement relative to the rotating member 52 is restricted by being fitted into an annular groove provided on the boot clamping surface. Similarly, the inner boot 59 is also constrained from relative movement in the radial direction by the one rotary member 52 and the boot pressing plate 60 at the annular portion 59a at one end thereof.

  However, in the shaft coupling including the boot having the mounting structure as described above, the relative movement (relative rotation) in the circumferential direction with respect to each rotating member of the boot is caused between the one end portion of the boot and one rotating member and the boot pressing plate. It is only restrained by the frictional force or the frictional force between the annular mounting member to which the other end of the boot is bonded and the other rotating member. For this reason, the lubricant retained inside the joint enters between these members and the coefficient of friction decreases, so that the boot rotates relative to each rotating member, and the boot and the annular mounting member wear. May come off or the sealing performance of the boot may be reduced.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating member for a boot that holds a lubricant therein in a shaft coupling that transmits power via rolling elements disposed at intersecting positions of guide grooves orthogonal to each other between two parallel axes. Is to prevent relative rotation with respect to.

  In order to solve the above problems, the present invention attaches a boot press plate facing one end of the boot to one side surface of the rotating member, and at least one of the rotating member and the boot holding surface of the boot pressing plate. An annular groove and a radial groove extending in the radial direction of the rotating member from the annular groove, and a fitting portion that fits into the annular groove and the radial groove is provided at one end of the boot. The one end of the boot is attached to one of the rotating members by fitting into an annular groove and a radial groove. As a result, the boot is not only restrained from relative movement in the radial direction by fitting the fitting portion with the rotating member or the annular groove of the boot pressing plate, but is also relatively fixed by fitting the fitting portion with the radial groove. Rotation can also be constrained.

  In the present invention, as described above, the fitting portion of the one end portion of the boot of the shaft coupling is fitted to the annular groove and the radial groove provided in at least one of the rotating member and the boot pressing plate, so that the rotating member of the boot Since both radial relative movement and relative rotation are constrained, wear of the contact portion between the boot and the mounting member integral with the boot and the rotating member is eliminated, and rattling of the mounting member, falling off of the boot, and sealing performance are eliminated. Can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. As shown in FIG. 1, the shaft coupling includes plates (rotating members) 1 and 2 fixed to input / output shafts A and B, which are opposed to each other in the axial direction and are held in parallel with each other. , A plurality of steel balls (rolling elements) 3 arranged between the plates 1 and 2, and a cage 4 that restrains movement of each steel ball 3 in the plate radial direction. Power is transmitted between the plates 1 and 2. Although FIG. 1 shows a state in which both plates 1 and 2 are concentric for the sake of explanation, it is usually used in a state in which the rotational axes of both plates 1 and 2 are deviated (eccentric) as will be described later. .

  Each of the plates 1 and 2 is a donut-shaped disk, and is fitted into the outer periphery of the shaft end portions of the input shaft A and the output shaft B so as to face each other in the axial direction. In each of the plates 1 and 2, guide grooves 5 and 6 are formed at equal intervals in the circumferential direction so as to be orthogonal to the guide grooves at corresponding positions on the counterpart plate. The cage 4 is formed in an annular shape, and long holes 7 extending in a direction perpendicular to the radial direction are provided at equal intervals in the circumferential direction. And each said steel ball 3 is distribute | arranged to the crossing position of the guide grooves 5 and 6 of both plates 1 and 2, respectively, and is accommodated in the long hole 7 of the holder | retainer 4, and the movement of a plate radial direction is restrained. The guide grooves 5 and 6 are guided to roll.

  Moreover, the outer boot 8 and the inner boot 9 which block | close the circumference | surroundings between the both plates 1 and 2 are attached to both plates 1 and 2, thereby holding a lubricant such as grease inside the joint, In addition to reducing friction and suppressing wear on the contact surfaces between the guide grooves 5 and 6 and the cage 4 and the steel ball 3, foreign matter from the outside of the joint is prevented.

  Each of the boots 8 and 9 is formed in an accordion shape with an elastomer such as rubber, and the central portion thereof is elastically deformed following the eccentricity of both plates 1 and 2. And one end part is pinched by the output side plate 2 and the boot press plate 10 attached to the outer side surface, and the other end part is via the annular attachment members 11 and 12 to which this part is baked and bonded. Are press-fitted into the outer periphery and inner periphery of the input side plate 1.

  Here, as shown in FIG. 2, the output side plate 2 includes annular grooves 2 a and 2 b and annular rings in the vicinity of the outer periphery and the inner periphery of the boot clamping surface that clamps one end of each boot 8 and 9. A plurality of radial grooves 2c and 2d extending in the plate radial direction from the grooves 2a and 2b are provided. As shown in FIG. 1, the boot pressing plate 10 has annular grooves 10 a and 10 b at positions facing the annular grooves 2 a and 2 b of the output side plate 2.

  On the other hand, as shown in FIG. 3, the outer boot 8 has, at one end thereof, an annular portion that fits in the annular grooves 2 a and 10 a on the outer peripheral side of the output side plate 2 and the presser plate 10 and the outer peripheral side of the output side plate 2. A fitting portion 8a comprising a plurality of protrusions fitted in the radial groove 2c is provided. Further, as shown in FIG. 4, the inner boot 9 has an inner portion of the output side plate 2 and an annular portion that fits in the annular grooves 2 b and 10 b on the inner peripheral side of the output side plate 2 and the presser plate 10. A fitting portion 9a is provided that includes a plurality of protrusions that fit into the circumferential radial groove 2d. The boots 8 and 9 are fitted with the fitting portions 8a and 9a fitted into the annular grooves 2a and 2b and the radial grooves 2c and 2d of the output side plate 2 and the annular grooves 10a and 10b of the presser plate 10, respectively. The output side plate 2 and the presser plate 10 are sandwiched.

  This shaft coupling has the above-described configuration, and when the input-side plate 1 rotates, the steel ball 3 pushed in the guide groove 5 from the circumferential direction is restrained from moving in the plate radial direction by the cage 4. Then, the power is transmitted to the output side plate 2 by pushing the guide groove 6 of the output side plate 2. In addition, even if the rotation direction of the input side plate 1 changes or the driving side and the driven side of both plates 1 and 2 are reversed, power transmission is performed by the same mechanism.

  The power transmission mechanism is basically the same even in a normal use state where the plates 1 and 2 are eccentric. That is, although illustration is omitted, when the plates 1 and 2 are decentered, the intersecting position of the guide grooves 5 and 6 changes in the circumferential direction of the plate, and each steel ball 3 becomes a long hole in the guide grooves 5 and 6 and the cage 4. 7, power is transmitted between the plates 1 and 2 while rolling.

  In this shaft coupling, as described above, the fitting portions 8a and 9a provided at one end of each boot 8 and 9 are connected to the annular grooves 2a and 2b, the radial grooves 2c and 2d of the output side plate 2, and the boots. Since they are fitted in the annular grooves 10a and 10b of the presser plate 10, both the radial relative movement and the relative rotation of the boots 8 and 9 with respect to the output side plate 2 are restrained. Therefore, one end portion of each boot 8 and 9 and the contact portion of the annular mounting members 11 and 12 with the input side plate 1 are not worn, and the mounting members 11 and 12 are not rattled or the boots 8 and 9 are dropped. There is no possibility that the sealing performance is lowered.

  In the above-described embodiment, the annular groove to be fitted to the fitting portion of each boot is provided in the output side plate and the boot holding plate, and the radial groove is provided in the output side plate. However, the radial groove is provided in the holding plate. You may make it provide. Further, the boot mounting structure on the output side may be adopted on the input side, or the boot mounting structure may be switched between the input side and the output side.

Vertical sectional view of the shaft coupling of the embodiment The perspective view of the output side plate of FIG. a is a longitudinal sectional view of the outer boot of FIG. 1, and b is a sectional view taken along line III-III of a. a is a longitudinal sectional view of the inner boot of FIG. 1, b is a sectional view taken along line IV-IV of a. Vertical section of a conventional shaft coupling Sectional view taken along the line VI-VI of the outer boot of FIG.

Explanation of symbols

1, 2 Plate (Rotating member)
2a, 2b annular groove 2c, 2d radial groove 3 steel ball (rolling element)
4 Cage 5, 6 Guide groove 7 Long hole 8, 9 Boot 8 a, 9 a Fitting part 10 Boot retainer plate 10 a, 10 b Annular groove 11, 12 Annular mounting member A Input shaft B Output shaft

Claims (1)

  A plurality of guide grooves are orthogonal to the guide grooves at corresponding positions of the counterpart rotating member on the opposing surfaces of the two rotating members that are axially opposed and are held in a state where the rotation axes are parallel to each other and not concentric. A rolling element that rolls while being guided by each guide groove at a position where the guide grooves of the two rotating members intersect with each other, and that holds the rolling members in the radial direction of the rotating member. In the shaft coupling in which the power is transmitted between the rotating members via the rolling elements, and the space between the rotating members is closed with boots attached to the rotating members, A boot retainer plate that is opposed to one end of the boot is attached to one side surface of the rotation member, and an annular groove and a radial direction of the rotation member from the annular groove are formed on at least one of the rotation member and the boot holding surface of the boot retainer plate. To A radial groove and a fitting portion that fits into the annular groove and the radial groove are provided at one end of the boot, and the fitting portion is fitted into the annular groove and the radial groove. A shaft coupling having one end attached to one rotating member.

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