JP2013194805A - Thrust needle roller bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust needle roller bearing device, in which an inner ring or an outer ring is locked to a support member to surely prevent the inner and outer rings from slipping off in assembly work, and contact between the outer and inner rings and a retainer is prevented to improve durability.SOLUTION: A thrust needle roller bearing device includes: an outer ring 6 in which a locking projection piece 6d is disposed to a tubular part 6c; an inner ring 5; a needle roller 7; a retainer 2; and an outer ring support member 4 and an inner ring support member 3 supporting the outer ring 6 and the inner ring 5. The outer ring support member 4 has a locking recess groove 10 formed to an inner peripheral face 4b. The locking projection piece 6d is inserted along the locking recess groove 10, the outer ring 6 is locked to the outer ring support member 4 in an axial direction, and a first clearance g1 is formed between the locking projection piece 6d and the locking recess groove 10 in a radial direction and a second clearance g2 is formed between the tubular part 6c and the inner peripheral face 4b in the radial direction. The first clearance g1 is larger than the second clearance g2, and a half of a clearance made by diametrally adding the second clearance g2 is larger than an eccentric amount between the outer ring support member 4 and the inner ring support member 3.

Description

  The present invention relates to a thrust needle roller bearing device.

  The thrust needle roller bearing device is mounted between members facing each other in the axial direction and rotating relative to each other, and supports a thrust load acting between the members. For example, in the case of an automobile transmission, it is mounted between an end face of a rotating shaft and an end face of a gear that are opposed in the axial direction, and supports a thrust load that acts between the rotating shaft and the gear that rotate relative to each other. The thrust needle roller bearing device includes an inner ring and an outer ring, a race and a flange formed integrally with the inner ring and the outer ring, a plurality of needle rollers interposed between the races, and the rollers radially. A thrust needle roller bearing comprising a cage that is disposed and held so as to roll freely, and an outer ring support member and an inner ring support member that support the outer ring and the inner ring, respectively.

  By the way, the rotation center of the inner ring support member and the outer ring support member may not be the same and may be decentered depending on the dimensional accuracy and assembly accuracy of each part constituting these. When the eccentric amount of the inner ring support member and the outer ring support member is small, the thrust needle roller bearing absorbs the eccentricity by allowing the cage to swing and allows the inner ring support member and the outer ring support member to rotate. Yes. On the other hand, when the amount of eccentricity increases, the cage does not completely absorb the eccentricity, and the outer peripheral edge or inner peripheral edge of the retainer comes into contact with the outer ring or the inner flange of the inner ring or outer ring. The inner ring and the outer ring are not fixed to the support members that support each other, and a gap that is movable in the radial direction is interposed between the support member and the thrust ring so that the inner ring and the outer ring are pushed out by the cage. The inner ring or outer ring thus moved can move in the radial direction within the range of the gap.

  When this thrust needle roller bearing is mounted, the inner ring support member supporting the inner ring has an axial end face on the upper side, and the inner ring, rollers and cage, and the outer ring are stacked thereon, and the outer ring support member is disposed. It is an assembly work of stacking method. After installing the thrust needle roller bearing, it is necessary to handle it carefully so that the inner and outer rings do not fall off, reducing the degree of freedom in assembly work. For example, in Patent Document 1, a locking protrusion formed on an inner ring or an outer ring is inserted into a locking groove through a groove in a support member, and then the inner and outer rings are rotated so that the locking protrusion and the groove are inserted. An invention is disclosed in which the inner ring or the outer ring is locked to the support member by shifting the phase to prevent the inner and outer rings from falling off.

JP 2007-297830 A

  However, in the case of this thrust needle roller bearing, since the inner ring or the outer ring is locked to the support member, there is no gap in which the inner ring or the outer ring can move in the radial direction, and the inner ring or the outer ring is pushed out to the cage. Can't even move. As a result, when the amount of eccentricity between the inner ring support member and the outer ring support member increases, the inner ring or outer ring and the retainer come into strong contact with each other and heat generation due to friction increases, resulting in problems such as seizure. It was.

  The present invention has been made to solve the above-described problems, and the problem to be solved by the present invention is to lock the inner ring or outer ring to the support member and drop off the inner and outer rings during assembly work. It is an object of the present invention to provide a thrust needle roller bearing device that reliably prevents the outer ring and the outer ring and the inner ring from being brought into contact with the cage to improve durability.

  The invention according to claim 1 includes an annular race portion, a flange portion formed on an outer peripheral edge of the race portion, a cylindrical portion formed to extend in one axial direction on the inner peripheral edge of the race portion, An outer ring provided with a locking protrusion formed to project radially outward at at least one location of one edge of the cylindrical part, an inner ring provided with an annular race part, and the inner ring And a plurality of needle rollers arranged radially between the outer rings, a retainer for holding the rollers in a rollable manner, and an axially opposed arrangement for supporting the outer ring and the inner ring, respectively. And an outer ring support member and an inner ring support member that rotate relative to each other, and the outer ring support member is a hollow shaft and a portion that enters one axial direction from an axial end surface into an inner peripheral surface of a central hole of the hollow shaft More than the number of the locking projections formed up to A thrust needle roller bearing having a concave groove and being used in a state in which the locking protrusion is inserted along the locking groove and the outer ring is axially locked to the outer ring support member. In the apparatus, a first gap is provided in the radial direction between the locking protrusion and the locking groove, and a second gap is provided in the radial direction between the cylindrical portion and the inner peripheral surface of the center hole. And a half of the gap obtained by adding the second gap in the diametrical direction is greater than the amount of eccentricity between the outer ring support member and the inner ring support member. Was also bigger.

  According to the invention of claim 1 configured as described above, even after the outer ring is assembled to the outer ring support member, the outer ring is axially formed by the locking protrusion and the locking groove even when the outer ring is lowered. Since it is locked, it is possible to reliably prevent the outer ring from falling off. Thereby, the freedom degree of an assembly | attachment operation | work can be raised and handling can be made easy.

  And since the 1st clearance gap is made larger than the 2nd clearance gap, the outer ring | wheel can move freely in the radial direction within the range of the 2nd clearance gap. This increases the amount of eccentricity between the inner ring support member and the outer ring support member, and the outer ring is pushed out when the outer peripheral edge of the cage comes into contact with the outer flange portion of the retainer and pushes the outer ring radially outward. Can move in the specified direction. Thereby, since an outer ring | wheel and a holder | retainer do not contact strongly, the heat_generation | fever by a friction, the image sticking, etc. can be suppressed and durability can be improved.

  Further, since the half of the gap obtained by adding the second gaps in the diameter direction is made larger than the eccentric amount between the inner ring support member and the outer ring support member, the eccentricity between the inner ring support member and the outer ring support member. Can be absorbed. Thereby, even if it does not raise the dimensional accuracy and assembly | attachment precision of each part, contact with an outer ring | wheel and a holder | retainer can be prevented and durability can be improved.

  According to the present invention, the inner ring or the outer ring is locked to the support member to surely prevent the inner and outer rings from falling off during assembly work, and the outer ring, the inner ring and the cage are prevented from coming into contact with each other. An improved thrust needle roller bearing device can be provided.

It is sectional drawing of the axial direction of the state which assembled the thrust needle roller bearing apparatus which concerns on the 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is sectional drawing of the axial direction of the state before assembling the thrust needle roller bearing apparatus of FIG. It is sectional drawing of the axial direction of the state which assembled the thrust needle roller bearing apparatus which concerns on the 2nd Embodiment of this invention.

[First Embodiment]
Hereinafter, a thrust needle roller bearing device 1 according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a thrust needle roller bearing device 1 includes an inner ring 5 and an outer ring 6, race portions 5a and 6a formed integrally with the inner ring 5 and the outer ring 6, and both race portions 5a and 6a. A thrust needle roller bearing including a plurality of needle rollers 7 interposed therebetween and a cage 2 that radially arranges and holds the rollers 7 and supports the inner ring 5 and the outer ring 6 are supported. The inner ring supporting member 3 and the outer ring supporting member 4 are configured.

  The inner ring 5 is formed in an annular shape, and is integrally formed with a race portion 5a that serves as a raceway surface in the axial direction. The outer ring 6 is formed in a substantially annular shape with a Z-shaped cross section, and is integrally formed with a race portion 6a that is a raceway surface in the axial direction and a cylindrical portion 6c that extends to one side in the axial direction on the inner peripheral edge. Yes. A flange portion 6b is formed on the outer peripheral edge of the race portion 6a. Further, two locking projections 6d are formed at equal intervals in the circumferential direction on one edge of the cylindrical portion 6c. The locking protrusion 6d is formed by caulking and deforming the edge of the cylindrical portion 6c radially outward. The inner ring 5 and the outer ring 6 are formed by press forming a steel plate.

  The inner ring support member 3 is a shaft member, and a stepped portion serving as a backup surface for supporting the inner ring 5 is formed on the axial end surface 3a. The outer ring support member 4 is a shaft member of a hollow shaft, and a backup surface for supporting the outer ring 6 is formed on the axial end surface 4a.

  As shown in FIG. 3, a locking groove 10 is formed in a spiral shape on the inner peripheral surface 4 b of the center hole of the hollow shaft of the outer ring support member 4 from the axial end surface 4 a to a portion entering one of the axial directions. Has been.

  As shown in FIG. 2, the locking concave grooves 10 are formed at four positions at equal intervals in the circumferential direction, and any two of the locking grooves 10 are arranged so as to be in phase with the locking protrusions 6 d of the outer ring 6. . The inner ring support member 3 and the outer ring support member 4 are disposed concentrically facing each other in the axial direction and rotate relative to each other.

  The cage 2 is formed in an annular shape, and a plurality of radially arranged pockets 2a are formed at equal intervals in the circumferential direction, and the needle rollers 7 are rotatably held in the pockets 2a.

  When the outer ring 6 is assembled to the backup surface of the outer ring support member 4, as shown in FIG. 3, the outer ring 6 and the outer ring support member 4 are arranged concentrically and the cylindrical portion 6 a is opposed to the hollow shaft of the outer ring support member 4. In this state, with respect to the circumferential direction of the outer ring 6 and the outer ring support member 4, the phases of the locking protrusions 6 d and the locking grooves 10 are matched, and the locking protrusions 6 d are moved along the locking grooves 10. Insert while rotating. As a result, the outer ring 6 is locked in the axial direction by the locking protrusion 6 d and the locking groove 10, and the outer ring 6 is fixed to the backup surface of the axial end surface 4 a of the outer ring support member 4.

  Here, the groove depth of the locking groove 10 of the outer ring support member 4 is deeper than the protruding amount of the locking protrusion 6d of the outer ring 6, and the locking protrusion 6d is engaged with the locking groove 10. In the state, the first gap g1 is provided in the radial direction. A second gap g <b> 2 is provided in the radial direction between the cylindrical portion 6 a of the outer ring 6 and the inner peripheral surface 4 b of the center hole of the hollow shaft of the outer ring support member 4. Then, by making the first gap g1 larger than the second gap g2, the outer ring 6 can be moved in the radial direction while the outer ring 6 is locked in the axial direction.

  According to the thrust roller bearing device 1 configured as described above, even after the outer ring 6 is assembled to the outer ring support member 4 and the outer ring 6 is on the lower side, the outer ring 6 has the engagement protrusion 6d and the engagement recess. Since it is locked in the axial direction by the groove 10, the outer ring 6 can be reliably prevented from falling off. Thereby, the freedom degree of an assembly | attachment operation | work can be raised and handling can be made easy.

  And since the 1st clearance gap g1 is made larger than the 2nd clearance gap g2, the outer ring | wheel 6 can move the range of the 2nd clearance gap g2 freely to radial direction. As a result, the amount of eccentricity between the inner ring support member 3 and the outer ring support member 4 increases, the outer peripheral edge of the cage 2 comes into contact with the outer flange portion 6b of the outer ring 6, and the outer ring 6 is pushed radially outward. Sometimes the outer ring 6 can move in the pushed direction. Thereby, since the outer ring | wheel 6 and the holder | retainer 2 do not contact strongly, the heat_generation | fever by the friction, the image sticking, etc. can be suppressed, and durability can be improved.

  Moreover, since 1/2 of the gap obtained by adding the second gap g2 in the diameter direction is larger than the eccentricity between the inner ring support member 3 and the outer ring support member 4, the inner ring support member 3 and the outer ring support member 4 Can absorb the eccentricity between. Thereby, even if it does not raise the dimensional accuracy and assembly | attachment accuracy of each part, the contact with the outer ring | wheel 6 and the holder | retainer 2 can be prevented and durability can be improved.

[Second Embodiment]
Hereinafter, the configuration of the present embodiment will be described.
As shown in FIG. 4, the thrust needle roller bearing device 101 is different from the first embodiment in the configuration of the outer ring 6 and the outer ring support member 4 that supports the outer ring 6. Hereinafter, a different part from 1st Embodiment is demonstrated and description is abbreviate | omitted about the same part.

  The outer ring 6 is formed in a substantially annular shape with a Z-shaped cross section, and is integrally formed with a race portion 6a that becomes a raceway surface in the axial direction and a cylindrical portion 6c that extends to one side in the axial direction on the outer peripheral edge. Yes. A flange portion 6b is formed on the inner peripheral edge of the race portion 6a. Further, two locking projections 6d are formed at equal intervals in the circumferential direction on one edge of the cylindrical portion 6c. The locking protrusion 6d is formed by caulking and deforming the edge of the cylindrical portion 6c radially inward. The inner ring 5 and the outer ring 6 are formed by press forming a steel plate.

  On the outer peripheral surface 4b of the hollow shaft of the outer ring support member 4, a locking groove 10 is formed in a spiral shape from the axial end surface 4a to a portion entering one of the axial directions. The locking grooves 10 are formed at four positions at equal intervals in the circumferential direction, and any two of the locking grooves 10 are arranged so as to be in phase with the locking protrusions 6 d of the outer ring 6.

  When the outer ring 6 is assembled to the backup surface of the outer ring support member 4, the outer ring 6 and the outer ring support member 4 are disposed concentrically, and the outer ring 6 is placed with the cylindrical portion 6 a facing the hollow shaft of the outer ring support member 4. With respect to the circumferential direction between the outer ring support member 4 and the outer ring support member 4, the phase of the locking protrusion 6 d and the locking groove 10 is matched, and the locking protrusion 6 d is inserted along the locking groove 10 while rotating. As a result, the outer ring 6 is locked in the axial direction by the locking protrusion 6 d and the locking groove 10, and the outer ring 6 is fixed to the backup surface of the axial end surface 4 a of the outer ring support member 4.

  Here, the groove depth of the locking groove 10 of the outer ring support member 4 is deeper than the protruding amount of the locking protrusion 6d of the outer ring 6, and the locking protrusion 6d is engaged with the locking groove 10. In the state, the first gap g1 is provided in the radial direction. A second gap g <b> 2 is provided in the radial direction between the cylindrical portion 6 a of the outer ring 6 and the inner peripheral surface 4 b of the center hole of the hollow shaft of the outer ring support member 4. Then, by making the first gap g1 larger than the second gap g2, the outer ring 6 can be moved in the radial direction while the outer ring 6 is locked in the axial direction.

  According to the thrust roller bearing device 101 configured as described above, even after the outer ring 6 is assembled to the outer ring support member 4 and the outer ring 6 is on the lower side, the outer ring 6 has the engagement protrusion 6d and the engagement recess. Since it is locked in the axial direction by the groove 10, the outer ring 6 can be reliably prevented from falling off. Thereby, the freedom degree of an assembly | attachment operation | work can be raised and handling can be made easy.

  And since the 1st clearance gap g1 is made larger than the 2nd clearance gap g2, the outer ring | wheel 6 can move the range of the 2nd clearance gap g2 freely to radial direction. As a result, the amount of eccentricity between the inner ring support member 3 and the outer ring support member 4 increases, the outer peripheral edge of the cage 2 comes into contact with the outer flange portion 6b of the outer ring 6, and the outer ring 6 is pushed radially outward. Sometimes the outer ring 6 can move in the pushed direction. Thereby, since the outer ring | wheel 6 and the holder | retainer 2 do not contact strongly, the heat_generation | fever by the friction, the image sticking, etc. can be suppressed, and durability can be improved.

  Moreover, since 1/2 of the gap obtained by adding the second gap g2 in the diameter direction is larger than the eccentricity between the inner ring support member 3 and the outer ring support member 4, the inner ring support member 3 and the outer ring support member 4 Can absorb the eccentricity between. Thereby, even if it does not raise the dimensional accuracy and assembly | attachment accuracy of each part, the contact with the outer ring | wheel 6 and the holder | retainer 2 can be prevented and durability can be improved.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the invention described in the claims. For example, in this embodiment, the locking groove of the outer ring support member is formed in a spiral shape from the axial end surface to the part that enters one of the axial directions, but a key-shaped groove is formed to The outer ring may be fixed to the axial end surface of the outer ring support member by being locked in the axial direction by the stop protrusion and the locking groove.

1, 101: Thrust needle roller bearing device, 2: Cage,
3: inner ring support member, 3a: axial end surface (backup surface),
4: outer ring support member, 4a: axial end surface (backup surface), 4b: inner peripheral surface,
5: Inner ring, 5a: Race part,
6: Outer ring, 6a: Race part, 6b: Flange part, 6c: Tube part, 6d: Locking protrusion,
7: Needle roller, 10: Locking groove,
g1: First gap, g2: Second gap

Claims (1)

An annular race part;
A flange portion formed on the outer periphery of the race portion;
A cylindrical portion formed to extend in the axial direction on the inner periphery of the race portion;
An outer ring provided with a locking projection formed to project radially outward at at least one location of one edge of the cylindrical portion;
An inner ring provided with an annular race part;
A plurality of needle rollers arranged radially between the inner ring and the outer ring;
A cage for holding the rollers in a freely rollable manner;
An outer ring support member and an inner ring support member, which are arranged to face each other in the axial direction, support the outer ring and the inner ring, and rotate relative to each other,
The outer ring support member has a number of locking recesses equal to or more than the number of the locking protrusions formed on the hollow shaft and the inner peripheral surface of the center hole of the hollow shaft from the axial end surface to one portion in the axial direction Having a groove,
In the thrust needle roller bearing device used in a state where the locking protrusion is inserted along the locking groove and the outer ring is locked in the axial direction with respect to the outer ring support member,
A first gap is provided in the radial direction between the locking protrusion and the locking groove, and a second gap is provided in the radial direction between the cylindrical portion and the inner peripheral surface of the center hole, respectively.
The first gap is larger than the second gap, and ½ of the gap obtained by adding the second gap in the diameter direction is made larger than the eccentric amount between the outer ring support member and the inner ring support member. Thrust needle roller bearing device.

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