JP2019100372A - Co-rotation suppression mechanism of rotation/oscillation seal - Google Patents

Abstract

To suppress the co-rotation of a packing 21, and to suppress the generation of slide wear at the packing 21 accompanied by the co-rotation, in a rotation/oscillation seal 11 having the packing 21 and a backup ring 31.SOLUTION: In a mechanism for suppressing the co-rotation of a packing 21 with respect to the other member 61 in a rotation/oscillation seal 11 having the packing 21 which is attached to an attachment groove 52 formed at one member 51 out of relatively-rotating two members 51, 61, and slidably contacts with the other member 61, and a backup ring 31 for suppressing the protrusion damage of the packing 21, the mechanism has: a co-rotation suppression part 42 arranged between the packing 21 and the backup ring 31, and formed by irregular engagement; and a co-rotation suppression part 43 arranged between the backup ring 31 and the other member 51, and formed by irregular engagement.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a turning prevention mechanism in a rotation / rocking seal.

  Conventionally, as shown in FIG. 5A, a packing 72 is attached to a mounting groove 52 provided on the inner peripheral surface of a seal housing 51 which is one member of two members which rotate relative to each other, and the packing 72 is relative There is known a rotation / swing seal 71 structured to slidably contact an outer peripheral surface of an actuating rod 61, which is the other of two rotating members, as shown in FIG. 5 (B). There is known a rotation / swing seal 71 having a structure in which a backup ring 73 for suppressing the protrusion damage of the packing 72 is assembled to the packing 72.

  These rotation / rocking seals 71 are used, for example, as a power steering seal in a steering device of a vehicle such as an automobile.

  In addition, since the packing 72 slides on the actuating rod 61, these rotation / rocking seals 71 form a so-called rod seal.

JP, 2002-178942, A

  When the packing 72 is not sufficiently fixed to the seal housing 51 in the rotation / rocking seal 71 and a situation (following rotation) occurs following the rotation / rocking of the operating rod 61, the packing 72 is an inner surface of the mounting groove 52. Since the inner surface of the mounting groove 52 is generally formed to have a rough surface, sliding wear occurs on the packing 72.

  Therefore, the sliding torque (peripheral torque) between the packing 72 and the seal housing 51 is larger than the sliding torque (inner peripheral torque) between the packing 72 and the working rod 61 so that the packing 72 does not rotate with respect to the working rod 61. It corresponds by setting (peripheral torque> peripheral torque).

Where the torque is
Torque = radius × sliding resistance... (1)
Sliding resistance = tension force (expansion force) × friction coefficient ···································································· In actual use, however, the sliding torque between the packing 72 and the actuating rod 61 is greater than the sliding torque (peripheral torque) between the packing 72 and the seal housing 51 under the influence of a looseness of the packing 72 or a change in lubrication condition. (Internal torque) may be larger (peripheral torque <internal torque). As a result, the packing 72 rotates around the operating rod 61, slides on the inner surface of the mounting groove 52, and slides on the packing 72 There is a concern that dynamic wear may occur.

  In the present invention, in view of the above points, in a seal for rotation and swing having a packing and a backup ring, it is possible to suppress the turning of the packing and to suppress the occurrence of sliding wear associated with the turning of the packing. An object of the present invention is to provide a rotation suppression mechanism for a rotation / rocking seal.

  In order to solve the above problems, the rotation / swing seal co-rotation suppression mechanism of the present invention is mounted in a mounting groove provided in one of two members rotating relative to each other, and can slide on the other member. A seal for rotation and swing having a packing in contact and a backup ring for suppressing the protrusion breakage of the packing, which is a mechanism for suppressing supply of the packing to the other member, the packing and the backup It has a common rotation suppression part which consists of concavo-convex engagement provided between rings, and a common rotation restraint part which consists of concavo-convex engagement provided between the backup ring and the one member.

  As an embodiment, in the common rotation suppression mechanism described above, the common rotation suppression portion provided between the packing and the backup ring includes a recess provided in the packing and a convex provided in the backup ring. The combined rotation suppressing unit provided between the backup ring and the one member is a combination of the convex portion provided on the backup ring and the concave portion provided on the one member. The plurality of concave portions and the plurality of convex portions are provided in an equal arrangement.

  Further, as an embodiment, in the common rotation suppressing mechanism described above, the backup ring is formed in an axially symmetrical shape including the convex portion.

  In the present invention, since the common rotation suppression part consisting of concavo-convex engagement is provided between the packing and the backup ring and the common rotation suppression part likewise comprising the concavo-convex engagement is also provided between the backup ring and one member. Is locked by one member via a backup ring. Therefore, it is possible to suppress that the packing rotates relative to the other member, and to suppress the occurrence of sliding wear associated with the packing.

Principal part sectional view of a rotation / rocking seal provided with a turning restriction mechanism according to an embodiment of the present invention It is a figure which shows the packing with which the seal | sticker for rotation / rocking | fluctuation is equipped, (A) is the principal part sectional drawing, (B) is the bottom view, and C direction arrow view in (A) It is a figure which shows the backup ring with which the seal | sticker for rotation / rocking | fluctuation is equipped, (A) is the principal part sectional drawing, (B) is the upper surface or a bottom view, and D direction arrow view in (A) It is a figure which shows the seal housing with which the seal | sticker for rotation / rocking | fluctuation is equipped, (A) is the principal part sectional drawing, (B) is an E direction arrow view in (A). (A) and (B) are cross-sectional views of the main parts of the rotation / swing seal according to the conventional example.

  As shown in FIG. 1, the rotation / rocking seal 11 according to the embodiment is used as a power steering seal in a steering apparatus of a vehicle such as an automobile, and one of two members which rotate relative to each other. A packing which is attached to an annular mounting groove 52 provided on the inner peripheral surface of a seal housing 51 which is a member, and slidably contacts the outer peripheral surface of an actuating rod 61 which is the other member of the two members which rotate relative to each other. 21 and a back-up ring 31 for suppressing damage from the seal housing 51 and the operating rod 61 when the packing 21 receives and deforms under the sealing fluid pressure P, thereby preventing breakage. There is.

  The packing 21 is formed as a lip packing provided with a seal lip using a predetermined rubber, urethane or the like as a molding material, and the annular base 22 and the inner peripheral seal lip 23 slidably contacting the outer peripheral surface of the actuating rod 61. And the outer peripheral side seal lip 24 in contact with the groove bottom of the mounting groove 52 are integrally provided. Further, an annular step portion 25 is provided on the inner peripheral portion of the rear surface of the annular base portion 22, and the backup ring 31 is assembled to the step portion 25.

  On the other hand, the backup ring 31 is formed as a ring body having a substantially rectangular cross section by using a predetermined resin or the like as a molding material. Further, the backup ring 31 is formed such that the inner diameter thereof is slightly smaller than the inner diameter of the base portion 22 of the packing 21, so that the packing 21 is unlikely to protrude into the gap c.

  In addition, the rotation / rocking seal 11 is provided with a common rotation suppression mechanism 41 for suppressing the packing 21 from being supplied to the actuating rod 61, and this common rotation suppression mechanism 41 is a packing 21. And a second common rotation suppression portion 43 formed of concavo-convex engagement provided between the backup ring 31 and the seal housing 51; It is composed of

  The first common rotation inhibiting portion 42 provided between the packing 21 and the backup ring 31 is configured by a combination of a recess 26 provided in the packing 21 and a protrusion 36 provided in the backup ring 31.

  Among them, as shown in FIGS. 2 (A) and 2 (B), the recess 26 is provided on the end face 25a in the step portion 25 of the packing 21, and a plurality of the recesses 26 are provided in an equal arrangement. 4 equal distribution).

  On the other hand, as shown in FIGS. 3A and 3B, the convex portion 36 is provided on one end face 31a of the backup ring 31, and a plurality of convex portions 36 are provided in an equal arrangement (in FIG. Distribution).

  Therefore, the packing 21 is prevented from rotating with respect to the backup ring 31 by the convex portion 36 being inserted into the concave portion 26 and the both 26 and 36 being engaged in the circumferential direction.

  Further, the second common rotation inhibiting portion 43 provided between the backup ring 31 and the seal housing 51 is configured by combining the convex portion 37 provided on the backup ring 31 and the concave portion 57 provided on the seal housing 51. It is done.

  Among them, as shown in FIGS. 3A and 3B, the convex portion 37 is provided on the other end face 31b of the backup ring 31, and a plurality of convex portions 37 are provided in an equal arrangement (4 or the like in FIG. Distribution).

  On the other hand, as shown in FIGS. 4A and 4B, the concave portion 57 is provided on one end face 52b in the mounting groove 52 of the seal housing 51, and a plurality of concave portions 57 are provided equidistantly. (4 equal distribution in the figure).

  Therefore, the backup ring 31 is prevented from rotating with respect to the seal housing 51 by the convex portion 37 being inserted into the concave portion 57 and the both 37 and 57 being engaged in the circumferential direction.

  Further, as shown in FIGS. 3A and 3B, the convex portion 36 provided on one end face 31a of the backup ring 31 and the convex portion 37 provided on the other end face 31b are formed symmetrically in the axial direction. The backup ring 31 is also formed axially symmetrical as a whole.

  In the rotary / rocking seal 11 having the above configuration, the packing 21 is fixed to the side of the seal housing 51 and slides relative to the actuating rod 61. However, the packing 21 is affected by the looseness of the packing 21 or the change in lubrication condition. Sometimes follow the rotation and swing of the actuating rod 61 and tries to rotate it.

  However, in the rotation / rocking seal 11 configured as described above, the first common rotation inhibiting portion 42 formed by concavo-convex engagement is provided between the packing 21 and the backup ring 31, and the concavo-convex portion is also similarly formed between the backup ring 31 and the seal housing 51. Since the second rotation inhibiting portion 43 formed by the engagement is provided, the packing 21 is always prevented by the seal housing 51 via the backup ring 31. Therefore, the packing 21 can be prevented from rotating relative to the operating rod 61, and the occurrence of sliding wear associated with the packing can be suppressed.

  In addition, since a plurality of concave portions 26 and 57 and convex portions 36 and 37 are provided, it is possible to disperse the stress generated along with the concavo-convex engagement, and to suppress breakage of each part due to stress concentration. Can.

  Moreover, since the backup ring 31 is formed in the axially symmetrical shape including the convex portion, the backup ring 31 has no directivity when attached. Therefore, it is possible to mount the backup ring 31 in any direction in the axial direction, thereby improving the mounting workability.

DESCRIPTION OF SYMBOLS 11 Rotation and rocking seal 21 Packing 22 annular base 23 inner peripheral seal lip 24 outer peripheral seal lip 25 step portion 25 a step portion end face 26, 57 recess 31 backup ring 31 a, 31 b backup ring end face 36, 37 protrusion 41 Suppression mechanism 42 first rotation suppression portion 43 second rotation suppression portion 51 seal housing (one member)
52 Mounting groove 52b Mounting groove end face 61 Operating rod (other member)

Claims (3)

A rotation / swing apparatus having a packing attached to a mounting groove provided in one member of two members which rotate relative to each other and slidably contacting the other member, and a backup ring for suppressing the protrusion breakage of the packing. A mechanism for suppressing the packing from being supplied to the other member in a seal, comprising:
It is characterized by having a common rotation suppression part which consists of concavo-convex engagement provided between the packing and the backup ring, and a common rotation suppression part consisting of the concavo-convex engagement provided between the backup ring and the one member. Suppression mechanism for rotation and oscillation seals. In the additional rotation suppression mechanism according to claim 1,
The packing and the common rotation inhibiting portion provided between the backup ring are formed of a combination of a concave portion provided in the packing and a convex portion provided in the backup ring,
The backup ring and the common rotation inhibiting portion provided between the one member are formed of a combination of a convex portion provided on the backup ring and a concave portion provided on the one member.
A plurality of the concave and convex portions are provided in an equal arrangement, and the rotation prevention mechanism for the rotation / rocking seal. In the additional rotation suppression mechanism according to claim 1 or 2,
The said backup ring is formed in an axially symmetrical shape including the said convex part, The rotation prevention mechanism of the seal | sticker for rotation / rocking characterized by the above-mentioned.

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