JP2003028154A - Double row rolling bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device not affected by the change of a dimension of a rotating shaft. SOLUTION: This double row rolling bearing 3 is mounted between the aluminum rotating shaft 2 and an outer member 1, an inner ring 6 of the bearing 3 is integrated, and a plurality of outer rings 4, 5 are used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-row rolling bearing device, for example, a double-row rolling bearing device for supporting gears in an automobile transmission.

[0002]

2. Description of the Related Art Conventionally, a double row rolling bearing device for supporting gears in an automobile transmission has a structure shown in FIG. That is, the double-row angular rolling bearing 22 that supports the gear 20 is arranged between the inner circumference of the gear 20 and the outer circumference of the rotary shaft 21. This double-row angular type rolling bearing 22 has one outer ring 23 fitted to the inner circumference of the gear 20, two inner rings 24 and 25 fitted to the rotary shaft 21, an outer ring 23 and each inner ring 24, 25. It has two rows of rolling elements 26, 27 interposed therebetween. The lines of action of the rolling elements 26 and 27 are incorporated in an angular contact shape in a direction intersecting with each other on the outer ring 23 side. Specifically, the outer ring 23 is integrally formed with two rows of angular raceways 23a and 23b for rolling elements on the inner peripheral surface thereof, and the outer raceway 23a is formed on the outer peripheral surface of each inner ring 24 and 25. , 23b for angular contact with rolling element 2
4a and 25a are formed, and between one track 23a of the outer ring 23 and the track 24a of one inner ring 24, and the other track 23b of the outer ring 23 and the other track 25a of the other inner ring 25.
Rolling elements 26 and 27 are respectively interposed between them. The lines of action AA and BB of the rolling elements 26 and 27 are arranged to cross each other on the outer ring 23 side. The rolling elements 26 and 27 are circumferentially held by cages (not shown).

The inner rings 24, 25 are fitted to the peripheral step portion 28 of the rotary shaft 21 in a state where the bearing inner side end faces 24b, 25b are directly butted against each other, and the bearing outer side end face 24c of one inner ring 24. Is abutted against the side surface 28a of the circumferential step portion 28, and the bearing outer side end surface 25c of the other inner ring 25 is tightened by a nut 29 screwed to the rotating shaft 21 to apply a pressure to the inside of the bearing.

Further, the outer ring 23 is fitted in the peripheral step portion 30 on the inner periphery of the gear 20, and the one end face 23c of the outer ring 23 is arranged at the peripheral step portion 3.
The other end surface 23d is fixed by a retaining ring 31 fitted to the inner circumference of the gear 20 while being in contact with the side surface 30a of No. 0.

Further, in recent years, there is a strong demand for weight reduction, and it is often the case that the rotating shaft 21 is made of aluminum to satisfy the above demand.

[0006]

In the conventional double-row angular rolling bearing device of FIG. 2, since the rotary shaft 21 is made of aluminum for the purpose of weight reduction, the entire device including the bearing device is in use while the bearing is in use. When the temperature is raised, the dimensional change in the axial direction due to the influence of temperature becomes large. Therefore, although the inner pressure is applied to the inside of the bearing with the nut 29 butted between the inner rings 24 and 25 to adjust the clearance to zero, the expansion of the rotary shaft 21 causes the inner ring 24 and 25 to be compressed. There is a case where a gap is created and pressure loss occurs inside the bearing.

It is an object of the present invention to provide a double-row rolling bearing device in which no pressure loss occurs inside the bearing even if the axial dimension of the rotary shaft 2 made of aluminum changes due to temperature. .

[0008]

As means for solving the above problems, in the invention of claim 1, a double row rolling bearing is arranged between an aluminum shaft and an outer member, and an inner ring of this double row rolling bearing or In a double-row rolling bearing device for applying a pressure to a bearing by axially pressing one of the outer rings with a pressure applying member, the inner ring fitted to an aluminum shaft is integrally formed, and an outer member The outer ring fitted to the inner circumferential surface of the outer ring member is formed from a plurality of outer ring members, and the plurality of outer ring members are directly or indirectly arranged in axial abutment with the outer ring member on the inner circumferential surface of the outer member. The pressurizing member for pressing is arranged.

Further, in the invention of claim 2, the pressurizing member is a nut which is screwed onto the inner peripheral surface of the outer member and axially presses one end surface of the outer ring.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The contents of the present invention will be described with reference to FIG. A double-row angular rolling bearing 3 for supporting the gear 1 is arranged between the inner circumference of the gear 1 made of carburized steel and the outer circumference of the rotary shaft 2 made of aluminum. This double-row angular rolling bearing 3 has an angular raceway 4 on its inner peripheral surface.
two bearing steel outer rings 4, 5 on which a and 5a are formed,
An inner ring 6 made of integral bearing steel having an outer peripheral surface formed with an angular track 6a facing the angular track 4a of the one outer ring 4 and an angular track 6b facing the angular track 5a of the other outer ring 5, Angular track 4a of one outer ring 4a and one angular track 6a of the inner ring 6
Balls 7, which are rolling elements, are respectively held and held by a cage (not shown) between the space and between the angular raceway 5a of the other outer ring 5 and the other angular raceway 6b of the inner ring 6. The lines of action AA and BB of the balls 7 are set to intersect with each other on the inner ring 6 side.

A peripheral step portion 8 is formed on the rotary shaft 2, and the inner ring 6 is fitted in the peripheral step portion 8 with a clearance so that one end surface 6c of the inner ring 6 abuts on a side surface 8a of the peripheral step portion 8. The other end surface 6d of the inner ring 6 is fitted and fixed by a retaining ring 9 fitted in the circumferential groove 10 of the rotary shaft 2. Further, a peripheral step portion 11 is formed on the inner peripheral surface of the gear 1 and each outer ring 4, 5 is formed on the peripheral step portion 11 at each end surface 4b, 5b of each outer ring 4, 5 on the inner side of the bearing.
Are fitted in a directly butted state. And
The end surface 4c of the outer ring 4 on the outer side of the bearing is brought into contact with the side surface 11a of the peripheral step portion 11, and the end surface 5c of the outer ring 5 on the outer side of the bearing is formed with the screw part 1a formed on the inner peripheral surface of the gear 1. It is tightened by the nut 12 screwed into the bearing, whereby a predetermined pressure is applied inside the bearing. At this time, the gap between the abutting end surfaces 4b and 5b of the outer rings 4 and 5 is adjusted to be zero.

The outer rings 4 and 5 are provided with end faces 4 thereof.
Although b and 5b are directly butted with each other, in some cases, they may be indirectly butted with each other via a spacer, and the gap between the both end surfaces 4b and 5b is adjusted to zero. A gap may be provided depending on the conditions, and it is sufficient if at least a pressure is applied to the inside of the bearing. Further, the bearing type can adopt other types.

Since the present invention has the above configuration,
When the temperature of the equipment including the bearing 3 rises during the use of the bearing, the rotary shaft 2 made of aluminum for weight reduction thermally expands,
Even if the dimension changes in the axial direction, the inner ring 6 is an integral type, and the contact point P of the ball 7 on the action lines AA, BB of the inner ring 6
The axial distance S between 1 and P2 does not change. For this reason, since the influence of the dimensional change of the rotary shaft 2 does not act on the bearing 3, the pressure initially applied to the bearing 3 does not escape. Further, since the gear 1 is generally formed of carburized steel, there is little difference in linear expansion coefficient from the outer rings 4, 5 made of bearing steel, and stable pressurization is maintained over the entire operating temperature range of the equipment. Further, when the bearing 3 is used for supporting the gear, stable meshing of the gear is obtained and gear noise is reduced.

[0014]

According to the first aspect of the invention, even if the axial dimension of the aluminum rotary shaft changes due to thermal expansion, the inner ring of the double-row rolling bearing is of the integral type, so the axial dimension of the rotary shaft is large. The influence of the change does not act and the pressure applied to the bearing is prevented from being released. As a result, the bearing can be made compact.

Further, in the second aspect of the present invention, since the pressurizing member is formed of the nut, the structure is simple and the size can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a double row rolling bearing device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional double row rolling bearing device.

[Explanation of symbols]

1 gear 2 rotation axes 3 Double row angular contact rolling bearing 4 outer ring 5 outer ring 6 inner ring 7 balls 8 round steps 9 retaining ring 10 circumferential grooves 11 circumference section 12 nuts

Continued front page    F term (reference) 3J012 AB11 BB03 EB14 FB09 FB10                       HB02                 3J017 AA01 AA05 BA10 CA01 DA01                       DB02                 3J101 AA02 AA43 AA54 AA62 BA53                       BA54 BA56 BA64 BA77 EA14                       FA06 FA53 GA01 GA11

Claims (2)

[Claims] 1. A double-row rolling bearing is arranged between an aluminum shaft and an outer member, and either the inner ring or the outer ring of this double-row rolling bearing is axially pressed by a pressurizing member to form a bearing. In a double-row rolling bearing device that applies pressure,
The inner ring fitted to the shaft made of aluminum is integrally formed, and the outer ring fitted to the inner peripheral surface of the outer member is constituted by a plurality of outer ring members, and the plurality of outer ring members are directly or indirectly A double-row rolling bearing device, wherein the double-row rolling bearing device is arranged so as to abut in a direction and the pressurizing member for pressing the outer ring member is arranged on the inner peripheral surface of the outer member. 2. The double row rolling bearing device according to claim 1, wherein the pressurizing member is a nut that is screwed onto the inner peripheral surface of the outer member and axially presses one end surface of the outer ring. .