JP2009168104A - Thrust roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thrust roller bearing free of the risk that its retainer and raceway rings separate even if vibration, impact, etc., is applied. <P>SOLUTION: The retainer 2 with needle rollers 1 arranged is accommodated inside a raceway ring 3 in the shape of a cylinder having bottom, and in this condition, three slipoff preventive parts 9 are welded at constant angular intervals in the circumferential direction to the top face 8 of the peripheral wall 7 of the raceway ring 3. Therein the peripheral surfaces 9a of the slipoff preventive parts 9 are positioned inside in the radial direction at a distance L from the peripheral surface 7a of the peripheral wall 7 of the raceway ring 3, while the inside circumferential surfaces 9b of the slipoff preventive parts 9 are arranged overlapping in a distance e from the peripheral surface 2a of the retainer 2. This facilitates the welding operation and prevents certainly the retainer 2 from slipping off from the opening of the raceway ring 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a thrust roller bearing.

  A thrust roller bearing has a cage that rotatably holds a plurality of rolling elements (rollers) whose rotation axes are arranged radially, and a cylindrical shape with a bottom, and each rolling element that is held by the cage at the bottom. And a raceway formed with a raceway surface to be received.

  For thrust roller bearings used in transmission parts of vehicles (automobiles), considering the convenience of assembling to the housing and shaft, the cage where the rollers are arranged and the raceway ring will not come off. (Which is called “non-separable”). As shown in FIG. 7, in the conventional non-separable thrust roller bearing 50, a plurality of portions of the peripheral wall portion of the race 51 are caulked inward in the radial direction, and a caulking portion 52 is formed. . Then, the caulking portion 52 is elastically deformed in a state where the outer peripheral edge portion of the cage 52 is in contact with the caulking portion 52, thereby preventing the raceway ring 51 and the cage 53 from being separated. As the above-described technique, there is one disclosed in Patent Document 1 or 2. A processing method for forming the caulking portion 52 on the peripheral wall portion of the race 51 is referred to as “staking”.

However, the race 51 and the cage 53 may be separated due to vibration or impact during transportation. This causes a problem in the vehicle assembly process.
Japanese Patent Laid-Open No. 5-180218 JP 2002-98156 A

  An object of the present invention is to prevent the cage and the raceway from separating even when vibration or impact is applied to the thrust roller bearing in view of the above-described problems.

Means for Solving the Problems and Effects of the Invention

The present invention for achieving the above-mentioned problems
A cage for holding a plurality of rolling elements with rotational axes arranged radially;
A thrust roller bearing having a cylindrical shape with a bottom, housing the cage inside a peripheral wall portion, and including a race ring that receives the plurality of rolling elements on a raceway surface formed on an inner surface of the bottom wall portion. There,
A slip-out preventing portion that protrudes inward in the radial direction from the end surface portion on the opening side of the peripheral wall portion of the bearing ring is formed, and the inner peripheral edge of the slip-off preventing portion is viewed from the direction of the rotation axis of the bearing ring. It is located radially inward from the outer peripheral edge of the cage,
The outer peripheral edge of the slip-off preventing portion is disposed radially inward from the outer peripheral edge of the peripheral wall portion of the raceway ring, and welding is performed on an exposed region formed on the end surface portion of the peripheral wall portion due to the shift. Thus, it is characterized by being fixed to the peripheral wall portion.

  In the thrust roller bearing according to the present invention, a slip-off preventing portion is formed on the peripheral wall portion of the bearing ring. The outer peripheral edge of the slip-off preventing portion is disposed radially inward from the outer peripheral edge of the peripheral wall portion of the race ring, and the slip-prevention portion is formed in an exposed region formed on the end surface portion of the peripheral wall portion of the race ring due to the shift. Is welded to adhere to the peripheral wall portion. This reliably prevents the cage from coming out of the opening of the raceway ring. As a result, the thrust roller bearing can be assembled accurately, and it is not necessary to form a caulking portion on the race.

  The slip-off preventing portion is formed of an annular plate whose inner diameter is smaller than the outer diameter of the cage, and one end surface portion is fixed to the end surface portion of the peripheral wall portion on the opening side of the track ring. it can.

  In the present invention, since the annular drop prevention portion is fixed over the entire circumference of the peripheral wall portion of the raceway ring, it is possible to more reliably prevent the cage from coming out of the raceway ring.

  And when the outer diameter of the said prevention part is formed smaller than the outer diameter of the said peripheral wall part, and the said prevention part is mounted in the said peripheral wall part, the outer periphery of the said prevention part is used as the peripheral wall of the said bearing ring. It is arranged on the inner side in the radial direction with respect to the outer peripheral edge of the part, and welding for fixing the drop-off preventing part to the peripheral wall part is performed on the exposed region formed on the end surface part of the peripheral wall part due to the deviation. Good.

  Thereby, since welding can be performed in a state where the drop prevention portion is placed on the peripheral wall portion of the race, the welding operation is facilitated and the drop prevention portion is difficult to come off.

  In addition, the bearing ring is hardened, and the exposed area is welded to the exposed area inside the peripheral wall portion of the hardened bearing ring, together with the rolling elements. The prevention part can be fixed to the peripheral wall part of the raceway ring.

  Since the slip prevention portion is fixed by welding after the raceway ring is hardened, the slip prevention portion can be secured to the race ring even if the cage is made of a resin material. Further, since the welding is performed after the quenching treatment, the welded portion is not tempered, and there is no possibility of reducing the hardness of the raceway or causing a cracking.

  Examples of the present invention will be described. FIG. 1A is a plan view of a thrust roller bearing 101 according to a first embodiment of the present invention, FIG. 1B is a front sectional view thereof, and FIG. 2 is an enlarged sectional view of a main part of FIG.

  As shown in FIG. 1, the thrust roller bearing 101 of the first embodiment of the present invention includes a cage 2 that holds a plurality (16 in the case of this embodiment) of rolling elements (needle rollers 1), and And a bearing ring 3 for accommodating the cage 2. The retainer 2 is provided with pockets 4 for radially arranging and accommodating the axial lines 1a of the needle rollers 1 at equal angular intervals in the circumferential direction. The needle rollers 1 accommodated in the respective pockets 4 can roll within the pockets 4.

  The race 3 will be described. As shown in FIG. 1 and FIG. 2, the race 3 is formed by bending a thin metal plate into a bottomed cylindrical shape, and the cage 2 is accommodated in the inner portion thereof. A raceway surface 6 for receiving each needle roller 1 is formed on the inner surface of the bottom wall portion 5 of the raceway ring 3 (the bottom face portion of the raceway ring 3). In addition, a peripheral wall portion 7 that rises in an orthogonal state from the bottom wall portion 5 is formed on the outer peripheral portion of the bottom wall portion 5.

  Here, the cage 2 and the race 3 are manufactured through separate steps. And as FIG. 3 shows, the holder | retainer 2 is dropped and arrange | positioned at the inner side part of the track ring 3. As shown in FIG. Since the bearing ring 3 of the thrust roller bearing 101 of the first embodiment is not provided with the caulking portion 52 (see FIG. 6), the cage ring 2 is simply dropped into the inner portion of the bearing ring 3. 3 can be accommodated.

  In this state, the retainer 2 is easily separated from the raceway ring 3, and therefore, in the thrust roller bearing 101 of the first embodiment, a slip-out preventing portion 9 is provided on the peripheral wall portion 7 of the raceway ring 3. The omission prevention unit 9 will be described. As shown in FIGS. 1 and 2, the upper end surface 8 (end surface portion on the opening side) of the peripheral wall portion 7 of the race 3 has a plurality of equiangular angles in the circumferential direction (120 ° in the case of the first embodiment). 3 pieces) are prevented from coming off. Each drop prevention portion 9 has a fan shape in plan view, and its outer peripheral surface 9 a is arranged at a position separated from the outer peripheral surface 7 a of the peripheral wall portion 7 of the race 3 by a predetermined distance L. Further, the inner peripheral surface 9 b of the slip-off preventing portion 9 protrudes inward in the radial direction from the inner peripheral surface 7 b of the peripheral wall portion 7 and is inner than the outer peripheral surface 2 a of the cage 2 accommodated in the bearing ring 3. (Described later). For this reason, the front end portion of the drop prevention portion 9 overlaps with the outer peripheral edge portion of the cage 2 in plan view.

  The outer periphery 9a is placed on the upper end surface 8 of the peripheral wall 7 of the race 3, and the upper end surface 8 of the peripheral wall 7 and the outer peripheral surface 9a of the anti-detachment portion 9 are welded. It is fixed. In this state, the inner peripheral surface 9 b of the slip-off preventing unit 9 is disposed on the inner side by a distance e than the outer peripheral surface 2 a of the cage 2. In other words, the retainer 2 and the removal prevention part 9 are arranged in a state where they are overlapped by a distance e. The three slip prevention portions 9 are provided at an equal angle (120 °) in the circumferential direction of the peripheral wall portion 7 of the race 3. As a result, the cage 2 does not come out of the inner part of the race 3 due to vibration during conveyance, and the thrust roller bearing 101 can be assembled accurately.

  As shown in FIG. 3, the above-described removal preventing portion 9 is welded in a state where the cage 2 is accommodated in the raceway ring 3. For this reason, tempering is not performed on the welded portion, and there is no possibility that the hardness of the race 3 is reduced or temper cracking occurs.

  In the thrust roller bearing 101 according to the first embodiment described above, the number of the respective prevention portions 9 is three. However, it is sufficient that there are two or more drop prevention portions 9. In addition, when there are two drop prevention portions 9, it is desirable that the two drop prevention portions 9 are arranged opposite to each other in the radial direction in order to more reliably prevent the retainer 2 from being pulled out.

  In the thrust roller bearing 101 of the first embodiment described above, the slip prevention portions 9 are provided at a predetermined angle at a plurality of locations (three locations in the first embodiment) of the raceway ring 3. However, as in the thrust roller bearing 102 of the second embodiment shown in FIG. 4, the annular drop prevention portion 11 is provided over the entire circumference of the peripheral wall portion 7 of the raceway ring 3. Also good. In this case, the outer peripheral surface 11a of the slip-off preventing portion 11 is shifted inward in the radial direction from the outer peripheral surface 7a of the peripheral wall portion 7 of the raceway ring 3 in the same manner as the slip-off preventing portion 9 of the first embodiment described above. In addition, by disposing the inner peripheral surface 11b on the inner side in the radial direction from the outer peripheral surface 2a of the cage 2, the same effect as the thrust roller bearing 101 of the first embodiment is exhibited.

  Furthermore, in the case of the thrust roller bearing 102 according to the second embodiment, the retainer 2 is securely inserted from the opening of the raceway ring 3 because the drop prevention portion 11 is provided over the entire circumference of the peripheral wall portion 7 of the raceway ring 3. There is an advantage that it does not come out. Moreover, since welding can be performed in a state in which the drop prevention portion 11 is placed on the upper end surface 8 of the peripheral wall portion 7 of the raceway ring 3, welding work is also easy.

  The thrust roller bearings 101 and 102 of the first and second embodiments are cases where there is one track ring 3. However, like the thrust roller bearing 103 of the third embodiment shown in FIG. 5, the pair of race rings 3 and 12 may be provided so as to sandwich the cage 2.

  Then, in the thrust roller bearing 103 of the third embodiment as in the thrust roller bearing 104 of the fourth embodiment shown in FIG. 6, not only one of the race rings 3 but also the peripheral wall portion 13 of the other race ring 12. Alternatively, the drop prevention part 14 may be fixed so as to protrude outward in the radial direction from the inner peripheral surface 13a.

  In the thrust roller bearings 101 to 104 of the above-described embodiments, the protruding length from the inner peripheral surface 7b or the outer peripheral surface 13a of the peripheral wall portions 7 and 13 of the race rings 3 and 12 in the slip prevention portions 9 and 14 is determined by the cage. 2 or the races 3 and 12 can be made longer if required. Furthermore, the protruding lengths of the dropout prevention portions 9 and 14 may be different.

(A) is a top view of the thrust roller bearing 101 of 1st Example of this invention, (b) is front sectional drawing similarly. It is an expanded sectional view of the principal part of FIG. It is a figure which shows the state which adhere | attaches the slip prevention part 9 to the thrust roller bearing 101. FIG. (A) is a top view of the thrust roller bearing 102 of 2nd Example of this invention, (b) is front sectional drawing similarly. (A) is a top view of the thrust roller bearing 103 of 3rd Example of this invention, (b) is front sectional drawing similarly. It is an expanded sectional view of the principal part of the thrust roller bearing 104 of 4th Example of this invention. (A) is a top view of the conventional thrust roller bearing 50, (b) is also a front sectional view.

Explanation of symbols

101-104 Thrust roller bearing 1 Needle roller (rolling element)
1a rotation axis 2 cage 2a outer peripheral surface (outer peripheral edge of cage)
3,12 Raceway ring 5 Bottom wall part 6 Raceway surface 7 Perimeter wall part 7a Peripheral surface (outer peripheral edge of peripheral wall part)
8 Upper end face (opening end face, exposed area)
9, 11, 14 Fall prevention part 9a, 11a Outer peripheral surface (outer peripheral edge of the fall prevention part)
9b, 11b Inner peripheral surface (inner peripheral edge of drop prevention part)
L Distance (deviation)

Claims (3)

A cage for holding a plurality of rolling elements with rotational axes arranged radially;
A thrust roller bearing having a cylindrical shape with a bottom, housing the cage inside a peripheral wall portion, and including a race ring that receives the plurality of rolling elements on a raceway surface formed on an inner surface of the bottom wall portion. There,
A slip-out preventing portion that protrudes inward in the radial direction from the end surface portion on the opening side of the peripheral wall portion of the bearing ring is formed, and the inner peripheral edge of the slip-off preventing portion is viewed from the direction of the rotation axis of the bearing ring. It is located radially inward from the outer peripheral edge of the cage,
The outer peripheral edge of the slip-off preventing portion is disposed radially inward from the outer peripheral edge of the peripheral wall portion of the raceway ring, and welding is performed on an exposed region formed on the end surface portion of the peripheral wall portion due to the shift. Accordingly, the thrust roller bearing is fixed to the peripheral wall portion.   The slip-off preventing portion is composed of an annular plate whose inner diameter is smaller than the outer diameter of the cage, and one end surface portion is fixed to the end surface portion of the peripheral wall portion on the opening side of the raceway ring. The thrust roller bearing according to claim 1, wherein   When the bearing ring is quenched, and the holder is housed together with the rolling element inside the peripheral wall portion of the quenched bearing ring, the exposed region is welded to thereby prevent the drop prevention portion. The thrust roller bearing according to claim 1 or 2, wherein is fixed to a peripheral wall portion of the raceway ring.

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