JP2010261532A - Constant velocity universal coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure the sealing performance of an end plate and a boot adapter by preventing the radial inward dislocation of packing. <P>SOLUTION: This constant velocity universal coupling includes an outer ring 10 opened at both ends and formed with a plurality of axially extending track grooves 12; an inner ring 20 formed with a plurality of axially extending track grooves 22; a plurality of balls 30 interposed between the track grooves 12 and the track grooves 22 to transmit torque; and a cage 40 holding the balls 30, wherein the end plate 50 and the boot adapter 64 are brought into close contact with the opening end face of the outer ring 10 through packings 52, 66. An annular protuberant part 70 projected toward the opening end face of the outer ring 10 is formed on the radial inside of the packing 52 in the end plate 50, and an annular protuberant part 80 projected toward the opening end face of the outer ring 10 is formed on the radial inside of the packing 66 in the boot adapter 64. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is used in power transmission mechanisms of automobiles and various industrial machines, and is a cross groove which is one of sliding type constant velocity universal joints incorporated in propeller shafts and drive shafts used in, for example, 4WD vehicles and FR vehicles. Related to type constant velocity universal joint.

  For example, propeller shafts used in automobiles such as 4WD vehicles and FR vehicles are slidable constant velocity universal joints called cross-groove types in order to have a structure that can cope with angular displacement due to a relative position change between a transmission and a differential. (For example, refer to Patent Document 1).

  FIG. 5 illustrates a disk-type cross groove type constant velocity universal joint. The constant velocity universal joint includes an outer ring 110, an inner ring 120, a ball 130, and a cage 140 as main components.

  The outer ring 110 is formed on the cylindrical inner peripheral surface 114 along the axial direction with a plurality of linear track grooves 112 inclined with respect to the axis. The inner ring 120 is formed on a spherical outer peripheral surface 124 along the axial direction with a plurality of linear track grooves 122 inclined in the opposite direction to the track grooves 112 of the outer ring 110 with respect to the axis. The ball 130 is incorporated at the intersection of the track groove 112 of the outer ring 110 and the track groove 122 of the inner ring 120 to transmit torque between them. The cage 140 is interposed between the cylindrical inner peripheral surface 114 of the outer ring 110 and the spherical outer peripheral surface 124 of the inner ring 120 to hold the ball 130. The shaft 200 is connected to the shaft hole 140a of the inner ring 120 by spline fitting, and the snap ring 190 prevents the shaft hole 140a from coming off. 6 is a sectional view taken along the line DD in FIG. 5 (hatching indicating the section is omitted), and FIG. 7 is an enlarged view of a circular frame M portion in FIG.

  In order to prevent the lubricant filled in the joint from leaking and to prevent foreign matter from entering, a hole formed in the outer ring 110 with a metal end plate 150 at one open end 116 (left side in FIG. 5) of the outer ring 110. A sealing device 160 is attached between the shaft 200 and the other open end 111 (the right side in FIG. 5) of the outer ring 110.

  As shown in FIG. 5, the end plate 150 has a rubber packing 152 fitted in a recess 113 formed on one opening end surface of the outer ring 110, and the end plate 150 is inserted into the opening end portion of the outer ring 110 via the packing 152. The sealability is ensured by press-fitting into 116. In order to facilitate the positioning of the packing 152, the packing 152 is attached to the outer ring facing surface of the end plate 150 with an adhesive sheet 154, and the packing 152 is inserted into the recess 113 of the outer ring 110 by press-fitting the end plate 150 into the outer ring 110. Is fitted and crushed so that the end plate 150 is brought into close contact with the open end surface of the outer ring 110.

  The sealing device 160 includes a boot 162 and a metal boot adapter 164. The boot 162 has a small end portion and a large end portion, and looks like a V-shape in the middle. The boot adapter 164 has a cylindrical shape, has a flange fitted to the outer peripheral surface of the outer ring 110 at one end, and is fixed to the outer ring 110 by bolting using the hole 118 together with the end plate 150. A small end portion of the boot 162 is attached to the shaft 200 and fastened with a boot band. The large end portion of the boot 162 is held by crimping the end portion of the boot adapter 164.

  Similarly to the above-described end plate 150, the boot adapter 164 also has a rubber packing 166 fitted into a recess 115 formed on the other opening end surface of the outer ring 110, and the boot adapter 164 is attached to the outer ring 110 via the packing 166. Sealing performance is ensured by press-fitting into the opening end 111. In order to facilitate the positioning of the packing 166, the packing 166 is adhered to the outer ring facing surface of the boot adapter 164 with an adhesive sheet 168, and the packing 166 is inserted into the recess 115 of the outer ring 110 by press-fitting the boot adapter 164 into the outer ring 110. Is fitted and crushed so that the boot adapter 164 is brought into close contact with the open end surface of the outer ring 110.

JP-A-3-223523

  By the way, in the above-described disk-type cross groove constant velocity universal joint, in order to prevent the lubricant filled in the joint from leaking, the end plate 150 is brought into close contact with one open end portion 116 of the outer ring 110, and the outer ring 110. The boot adapter 164 is in close contact with the other open end 111 of the.

  In order to ensure sealing performance by the end plate 150 and the boot adapter 164, rubber packings 152 and 166 are interposed between the end plate 150 and the boot adapter 164 and the opening end surface of the outer ring 110. The packings 152 and 166 are fitted into recesses 113 and 115 formed on the opening end surface of the outer ring 110, and the outer circumferences of the packings 152 and 166 are regulated by the peripheral wall surfaces 113 a and 115 a of the recesses 113 and 115. The end plate 150 and the boot adapter 164 are crushed by pressing the end plate 150 and the boot adapter 164 against the outer ring 110 by bolting to prevent the end plate 150 and the boot adapter 164 from opening to the opening end surface of the outer ring 110. It is made to adhere and ensure sealing performance.

  However, in this type of constant velocity universal joint, depending on the tightening condition of the bolt, the packing 152, 166 may be displaced inward in the radial direction due to the reaction force of the packing 152, 166. When such a positional shift occurs, the packings 152 and 166 do not intervene between the end plate 150 and the boot adapter 164 and the opening end surface of the outer ring 110, and it becomes difficult to ensure sealing performance.

  Even when the packings 152 and 166 are attached to the end plate 150 and the boot adapter 164 with the adhesive sheets 154 and 168, the adhesive sheets 154 and 168 lose their adhesive strength when used at high temperatures. As described above, there is a possibility that a problem that it becomes difficult to ensure the sealing performance due to the positional displacement of the packings 152 and 166 radially inward.

  Therefore, the present invention has been proposed in view of the above-described problems, and the object of the present invention is to prevent the packing from being displaced inward in the radial direction and to improve the sealing performance of the end plate and the boot adapter. The object is to provide a constant velocity universal joint that can be secured.

  As technical means for achieving the above-described object, the present invention provides an outer joint member having at least one end portion opened and having a plurality of track grooves extending in the axial direction on the inner peripheral surface, and an outer peripheral surface on the outer peripheral surface. Torque is provided between the inner joint member in which a plurality of axially extending track grooves are formed in pairs with the outer joint member track grooves, and between the outer joint member track grooves and the inner joint member track grooves. A plurality of balls for transmission, and a cage for holding the balls interposed between the inner peripheral surface of the outer joint member and the outer peripheral surface of the inner joint member. A constant velocity universal joint that is in close contact with the packing, and a convex portion that protrudes toward the opening end surface of the outer joint member and restricts the position of the packing is formed on the radially inner portion of the packing in the seal member. And wherein the door.

  In the present invention, by forming a convex portion that protrudes toward the opening end surface of the outer joint member at the radially inner portion of the packing in the seal member and restricts the position of the packing, the seal member is pressed into the outer joint member. Even if the packing is displaced inward in the radial direction by the reaction force of the packing, the packing is locked by the convex portion formed on the sealing member, and the positional displacement inward in the radial direction can be regulated. It becomes easy to ensure the sealing performance by.

  As a convex part in this invention, it is desirable to set it as the protruding part formed by carrying out the curve shaping | molding of the sealing member. This is effective in that the convex portion can be formed by simple processing. Note that the convex portion can be formed separately from the seal member in addition to being formed integrally with the seal member as described above.

  As for a convex part, contacting with the opening end surface of an outside joint member is desirable. In this case, even if the packing is displaced inward in the radial direction, the packing can be reliably locked to the convex portion of the seal member, so that it is possible to reliably prevent the displacement of the packing inward in the radial direction. . Note that the convex portion does not necessarily need to be brought into contact with the opening end surface of the outer joint member as long as it can be locked to the inner side in the radial direction of the packing when the packing is about to be displaced inward in the radial direction.

  Moreover, when forming the convex part which protrudes to the opening end surface side of an outer joint member in a sealing member, it is desirable to form in the multiple places of the circumferential direction. In this case, even if the packing tries to be displaced radially inward at a plurality of locations in the circumferential direction, this can be prevented by the convex portion. Further, in the present invention, when the convex portions are formed at a plurality of positions in the circumferential direction of the seal member at equal intervals, the convex portions are evenly arranged in the circumferential direction of the seal member. Can be reliably prevented by the convex portion. Moreover, if the convex part in this invention is cyclic | annular, since the convex part is arrange | positioned over the perimeter of a sealing member, the position shift to the radial direction inner side of packing can be prevented much more reliably.

  In the present invention, a structure in which an adhesive sheet is interposed between the seal member and the packing is desirable. In this way, when the seal member is press-fitted into the open end of the outer joint member, it is easy to reliably insert the packing between the seal member and the packing contact surface of the outer joint member.

  In the present invention described above, the track groove of the outer joint member is formed on the spherical inner peripheral surface of the outer joint member, and the track groove of the inner joint member is formed on the spherical outer peripheral surface of the inner joint member. It is effective to apply to a formed constant velocity universal joint, that is, a Barfield type constant velocity universal joint (BJ) which is one of fixed type constant velocity universal joints.

  Alternatively, in the present invention, the track groove of the outer joint member is formed linearly in a state inclined with respect to the axis, and the track groove of the inner joint member is inclined with respect to the axis in the direction opposite to the track groove of the outer joint member. In such a state, a constant velocity universal joint is formed in which the ball is formed in a straight line and the ball is incorporated in the intersection of the track groove of the outer joint member and the track groove of the inner joint member, that is, Lebro type (cross groove type: LJ), etc. It is effective to apply to a quick universal joint.

  According to the present invention, the convex portion that protrudes toward the opening end surface of the outer joint member and regulates the position of the packing is formed on the radially inner portion of the seal member in the seal member. Even if the packing tries to be displaced inward in the radial direction by the reaction force of the packing, the packing is locked by the convex portion formed on the seal member, so that the displacement inward in the radial direction can be prevented in advance. This makes it easy to ensure the sealing performance of the seal member. As a result, reliability can be improved, and a constant velocity universal joint with high quality and long life can be provided.

FIG. 3 is a cross-sectional view showing a main part configuration of a disk-type cross groove type constant velocity universal joint in the embodiment of the present invention. It is sectional drawing which follows the AA line of FIG. (A) is an enlarged view of the end plate of FIG. 1, (B) is a front view in the direction of the white arrow A of (A). It is an expanded sectional view of the X section of FIG. It is sectional drawing which shows the principal part structure of the conventional disk type cross groove type constant velocity universal joint. It is sectional drawing which follows the DD line | wire of FIG. It is an expanded sectional view of the M section of FIG.

  1 to 4 illustrate a disk-type cross groove type constant velocity universal joint according to an embodiment of the present invention. The present invention is applicable not only to a disk type but also to a flange type or bell type cross groove type constant velocity universal joint.

  The cross groove type constant velocity universal joint is a float type that regulates the amount of axial displacement due to interference between the cage 40 and the inner ring 20 by setting the minimum inner diameter of the cage 40 smaller than the maximum outer diameter of the inner ring 20. By setting the minimum inner diameter of the cage 40 to be larger than the maximum outer diameter of the inner ring 20, the cage 40 is roughly classified into two types, a non-float type that restricts the amount of axial displacement due to the interference between the ball 30 and the cage 40. They are used according to the characteristics (slide amount, load capacity, etc.) of the vehicle equipped with the propeller shaft and drive shaft. In this embodiment, a float type is illustrated, but the present invention can also be applied to a non-float type.

  The constant velocity universal joint of this embodiment includes an outer ring 10 that is an outer joint member and an inner ring 20 that is an inner joint member, as shown in FIG. 1 and FIG. The ball 30 and the cage 40 are main components.

  The outer ring 10 is formed on the cylindrical inner peripheral surface 14 along the axial direction with a plurality of linear track grooves 12 inclined with respect to the axis. The inner ring 20 is formed on the spherical outer peripheral surface 24 along the axial direction with a plurality of linear track grooves 22 inclined with respect to the axis in a direction opposite to the track grooves 12 of the outer ring 10. The ball 30 is incorporated at the intersection of the track groove 12 of the outer ring 10 and the track groove 22 of the inner ring 20 to transmit torque between them. The cage 40 is interposed between the cylindrical inner peripheral surface 14 of the outer ring 10 and the spherical outer peripheral surface 24 of the inner ring 20 to hold the ball 30. The shaft 100 is connected to the shaft hole 40a of the inner ring 20 by spline fitting, and the snap ring 90 prevents the shaft hole 40a from coming off.

  In order to prevent leakage of the lubricant filled in the joint and to prevent foreign matter from entering, a metal end plate 50 as a seal member is attached to the outer ring 10 at one open end 16 (left side in FIG. 1) of the outer ring 10. The formed hole 18 is fixed by bolting, and a sealing device 60 is mounted between the other open end 11 (the right side in FIG. 1) of the outer ring 10 and the shaft 100.

  In the end plate 50, a ring-shaped rubber packing 52 is fitted into a recess 13 formed on one opening end face of the outer ring 10, and the end plate 50 is press-fitted into the opening end 16 of the outer ring 10 through the packing 52. By doing so, the sealing performance is ensured. In order to facilitate positioning of the packing 52, the packing 52 is stuck to the outer ring facing surface of the end plate 50 with an adhesive sheet 54, and the packing 52 is inserted into the recess 13 of the outer ring 10 by press-fitting the end plate 50 into the outer ring 10. Is fitted and crushed so that the end plate 50 is brought into close contact with the open end surface of the outer ring 10.

  The sealing device 60 includes a boot 62 and a metal boot adapter 64 that is a seal member. The boot 62 has a small end portion and a large end portion, and is shaped so as to be folded back into a V shape in the middle. The boot adapter 64 has a cylindrical shape, has a flange fitted to the outer peripheral surface of the outer ring 10 at one end, and is fixed to the outer ring 10 by bolting using the hole 18 together with the end plate 50. A small end portion of the boot 62 is attached to the shaft 100 and fastened with a boot band. The large end portion of the boot 62 is held by crimping the end portion of the boot adapter 64.

  Similarly to the above-described end plate 50, this boot adapter 64 also has a ring-shaped rubber packing 66 fitted in the recess 15 formed on the other opening end surface of the outer ring 10, and the boot adapter 64 is connected via this packing 66. Sealing performance is ensured by press-fitting into the open end 11 of the outer ring 10. In order to facilitate the positioning of the packing 66, the packing 66 is stuck to the outer ring facing surface of the boot adapter 64 with an adhesive sheet 68, and the packing 66 is inserted into the recess 15 of the outer ring 10 by press-fitting the boot adapter 64 into the outer ring 10. Is fitted and crushed so that the boot adapter 64 is brought into close contact with the open end surface of the outer ring 10.

  In the embodiment shown in FIGS. 1 and 2, as shown in FIG. 4, which is an enlarged view of the circle X part of FIG. An annular raised portion 70 is formed so as to protrude toward the opening end surface side of 10, and is arranged on the radially inner side of the inner peripheral surface of the packing 52. The raised portion 70 is formed by bending the end plate 50 and is in contact with the opening end surface of the outer ring 10. The boot adapter 64 that is a seal member is formed with an annular raised portion 80 that protrudes toward the opening end surface of the outer ring 10 and is disposed on the radially inner side of the inner peripheral surface of the packing 66. The raised portion 80 is formed by bending the boot adapter 64 and is in contact with the opening end surface of the outer ring 10. FIG. 3A shows an enlarged view of the end plate 50, and FIG. 3B shows a front view in the direction of the white arrow A in FIG. 3A. Moreover, in FIG. 3 (A) and FIG. 3 (B), the code | symbol of 50, 51a-51d, 70 was attached | subjected to the same site | part.

  In this embodiment, the packings 52 and 66 are fitted into the recesses 13 and 15 of the opening end surface of the outer ring 10 by press-fitting the end plate 50 and the boot adapter 64 into the outer ring 10, and the peripheral wall surface 13 a of the recesses 13 and 15. , 15a can restrict the outer peripheries of the packings 52, 66 to prevent the outward escape in the radial direction. Further, even if the packings 52 and 66 are displaced inward in the radial direction by the reaction force of the packings 52 and 66 due to the press-fitting of the end plate 52 and the boot adapter 66 into the outer ring 10, they are formed in the end plate 50 and the boot adapter 64. The packings 52 and 66 are hooked and locked to the raised portions 70 and 80, so that the displacement inward in the radial direction can be reliably controlled, and the sealing performance of the end plate 50 and the boot adapter 64 can be ensured. It becomes easy. Since the annular raised portions 70 and 80 can be formed simultaneously with the molding of the end plate 50 and the boot adapter 64, the formation thereof is extremely easy.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims, and the equivalent meanings recited in the claims, and all modifications within the scope.

  For example, in the present embodiment, the convex portions formed on the end plate 50 and the boot adapter 64 are formed integrally with the end plate 50 and the boot adapter 64, but are formed separately from the end plate 50 and the boot adapter 64. You may make it do.

  Further, the raised portions 70 and 80 are brought into contact with the opening end face of the outer ring 10. When the packings 52 and 66 are about to be displaced inward in the radial direction, the radially inner portion of the packings 52 and 66 is raised to the raised portion 70. , 80 can prevent the positional displacement of the packings 52, 66 inward in the radial direction by the raised portions 70, 80. Therefore, the raised portions 70, 80 are not necessarily provided on the opening end surface of the outer ring 10. There is no need to make contact. However, when the bulging portions 70 and 80 are brought into contact with the opening end face of the outer ring 10, when the packings 52 and 66 try to be displaced inward in the radial direction, the radially inner portions of the packings 52 and 66 are located on the bulging portion 70, 66. It is desirable in that it can be securely locked to 80 and can prevent the displacement of the packings 52 and 66 inward in the radial direction.

  In the present embodiment, the present invention is applied to a cross groove type constant velocity universal joint which is one of sliding type constant velocity universal joints, but the type of constant velocity universal joint is not particularly limited. For example, the outer ring track groove is formed on the spherical inner peripheral surface of the outer ring, and the inner ring track groove is one of the fixed type constant velocity universal joints formed on the spherical outer peripheral surface of the inner ring. The present invention can also be applied to a constant velocity universal joint.

10 Outer joint member (outer ring)
11 End 12 Track groove 14 Inner peripheral surface 16 End 20 Inner joint member (inner ring)
22 Track groove 24 Outer peripheral surface 30 Ball 40 Cage 50 Seal member (end plate)
52 Packing 54 Adhesive sheet 64 Seal member (Boot adapter)
66 Packing 68 Adhesive sheet 70, 80 Convex part (raised part)

Claims (10)

  An outer joint member in which at least one end is opened and a plurality of track grooves extending in the axial direction is formed on the inner peripheral surface, and a plurality of members extending in the axial direction are paired with the track grooves of the outer joint member on the outer peripheral surface. An inner joint member in which track grooves are formed, a plurality of balls that are interposed between the track groove of the outer joint member and the track groove of the inner joint member, and an inner peripheral surface of the outer joint member A constant velocity universal joint which is interposed between the outer peripheral surface of the inner joint member and a cage for holding the ball, and in which a seal member is closely attached to the opening end surface of the outer joint member via a ring-shaped packing In the constant velocity universal joint, a projecting portion that protrudes toward an opening end face of the outer joint member and restricts the position of the packing is formed at a radially inner portion of the seal member in the seal member.   The constant velocity universal joint according to claim 1, wherein the convex portion is a raised portion formed by bending the seal member.   The constant velocity universal joint according to claim 1, wherein the convex portion is formed separately from the seal member.   The said convex part is a constant velocity universal joint as described in any one of Claims 1-3 which is contacting the opening end surface of the said outer joint member.   The said convex part is a constant velocity universal joint as described in any one of Claims 1-4 currently formed in the multiple places of the circumferential direction.   The constant velocity universal joint according to claim 5, wherein the convex portions are formed at equal intervals in the circumferential direction.   The constant velocity universal joint according to any one of claims 1 to 4, wherein the convex portion has an annular shape.   The constant velocity universal joint as described in any one of Claims 1-7 which interposed the adhesive sheet between the said sealing member and packing.   The track groove of the outer joint member is formed on the spherical inner peripheral surface of the outer joint member, and the track groove of the inner joint member is formed on the spherical outer peripheral surface of the inner joint member. The constant velocity universal joint according to any one of claims 8 to 9.   The track groove of the outer joint member is formed linearly in a state inclined with respect to the axis, and the track groove of the inner joint member is linear in a state inclined with respect to the axis in a direction opposite to the track groove of the outer joint member. The constant velocity universal joint according to any one of claims 1 to 8, wherein the constant velocity universal joint is formed in a shape, and the ball is incorporated in a crossing portion of a track groove of the outer joint member and a track groove of the inner joint member.

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