JP5050582B2 - Bearing device for rotating shaft support - Google Patents

Description

The present invention relates to a rotating shaft supporting bearing device , and more particularly to a rotating shaft supporting bearing device suitable for supporting a pinion shaft in an automobile final reduction gear or the like.

A tandem type double-row ball bearing having an outer ring, an inner ring, a plurality of balls arranged in a double row between both wheels, and a retainer for holding these balls, It is widely used in pinion shaft support devices and the like ( bearing devices for rotating shaft support) .

FIG. 2 shows an example of a differential gear device to which the bearing device for rotating shaft support according to the present invention is applied. The differential gear device is rotatably supported by a housing (41) and has a pinion at a rear end portion. A pinion shaft (42) provided with a gear (43), a ring gear (44) meshed with the pinion gear (43), and an inner / outer side 1 that rotatably supports the pinion shaft (42) on the housing (41). A pair of double row ball bearings (45), (46) and a drive shaft coupling flange joint (47) provided at the outer end of the pinion shaft (42) are provided.

In this differential gear device, the lubricating oil splashed with the rotation of the ring gear (44) passes through a lubricating oil passage (48) in the housing (41), and a pair of double row ball bearings (45) (46). It is introduced in the middle in the axial direction. When the double row ball bearings (45) (46) rotate, fluid flow (pump action) from the small diameter side to the large diameter side occurs, so the double row ball bearings (45) (46) for differential gear devices The small diameter side of each double row ball bearing (45) (46) is positioned inward in the axial direction, and this pump action is used to lubricate from the small diameter side (just the middle part of a pair of double row ball bearings) However, a lubrication method for discharging oil to the large diameter side is generally applied.
JP 2006-234100 A

  In a pinion shaft support device for a vehicle or the like, reduction of the rotational torque of the bearing has been an issue in order to reduce loss. In order to reduce the rotational torque, it is effective to reduce the amount of lubricant passing through the bearing and suppress the stirring resistance by the lubricant.

An object of the present invention is to provide a bearing device for supporting a rotating shaft that optimizes the amount of lubricant present in the bearing and suppresses the stirring resistance due to the lubricant, thereby enabling a reduction in torque. .

A bearing device for supporting a rotating shaft according to the present invention includes a housing, an outer ring attached to the housing, an inner ring attached to the rotating shaft, a plurality of balls arranged in a double row between the two wheels, and a cage for holding these balls. and a double row ball bearing having a double row ball in the bearing, the rotary shaft supporting bearing device to be moved to a larger diameter from the small diameter side lubricating agent by pump action, pumping downstream The lubricant can be discharged from the end face opening on the side, and the end of the passage provided in the housing is closed by the closing member for supplying the lubricant to the end face opening on the upstream side of the pumping action. Thus, the inflow of the lubricant from the end face opening on the upstream side of the pump action is prevented, and a lubricant supply passage is provided in the outer ring of the double row ball bearing to drop the lubricant on the balls located on the upstream side of the pump action. Et And it is characterized in that is.

  The double-row ball bearing uses the pump action to discharge the inflowing lubricating oil. Conventionally, this type of double-row ball bearing is used as oil bath lubrication, but this oil bath lubrication is abolished because it causes an increase in the amount of lubricant supplied. The lubricant supply passage is provided at the uppermost part of the outer ring where the lubricant can be dropped on the ball located on the pumping inflow side, for example, in the vicinity of the outer ring end and facing the outer side in the axial direction of the ball. Alternatively, it may be provided at a position in the vicinity of the center portion of the outer ring and facing the axially inner portion of the ball. The latter is more preferable for optimizing the amount of lubricant. In this way, the lubricant is directly supplied to the balls located on the pump action inflow side, and the lubricant is supplied to the balls located on the pump action discharge side by the pump action of the balls located on the pump action inflow side. .

  In the housing or the like to which the outer ring is attached, an in-housing lubricant supply passage for supplying the lubricant to the lubricant supply passage is appropriately formed. The passage diameter of the lubricant supply passage including the lubricant supply passage in the housing is adjusted so as to optimize the amount of lubricant staying in the bearing (as little as possible and reliably prevent seizure).

  As the double row ball bearing, for example, an outer ring having a double row raceway surface having different diameters, an inner ring having a double row raceway surface corresponding to each raceway surface of the outer ring, and a raceway surface between each row of both wheels A plurality of large-diameter side balls and a plurality of small-diameter side balls arranged with different pitch circle diameters, a large-diameter side retainer that holds the plurality of large-diameter side balls, and a small-diameter side retainer that holds the plurality of small-diameter side balls However, the present invention is not limited to this, and a double-row ball bearing having raceway surfaces having the same diameter may be used.

According to the bearing device for supporting a rotating shaft of the present invention, since the lubricant supply passage for supplying the lubricant into the bearing is provided in the outer ring, the oil bath lubrication that tends to increase the lubricant can be eliminated. By adjusting the passage diameter of the lubricant supply passage, the amount of lubricant retained in the bearing can be optimized, and the torque can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows one embodiment of a bearing device for supporting a rotating shaft according to the present invention. The double row ball bearing (1) of the bearing device for rotating shaft support includes an outer ring (2) having double row raceway surfaces (2a) and (2b) having different diameters and attached to the housing (10), and an outer ring. An inner ring (3) having a double row of raceway surfaces (3a) and (3b) corresponding to the raceway surfaces (2a) and (2b) of (2) and attached to a rotating shaft (not shown), and both wheels (2) ( A plurality of large-diameter side balls (4) and a plurality of small-diameter side balls (5) arranged with different pitch circle diameters between the raceway surfaces (2a) (3a) (2b) (3b) in each row of 3), A large-diameter side cage (6) that holds a plurality of large-diameter side balls (4) and a small-diameter side cage (7) that holds a plurality of small-diameter side balls (5) are provided.

In this housing (10), the end of the passage for supplying the lubricant to the small diameter side of the double row ball bearing (1), which is necessary for oil bath lubrication, is closed by a wall (10a) or the like (closing member) . As a result, the lubricant reservoir (10b) having the closing wall (10a) as the bottom wall is formed. A lubricant supply passage (8) for supplying a lubricant into the bearing (1) is provided at the uppermost part of the outer ring (2) and in the middle in the axial direction. Correspondingly, an in-housing lubricant supply passage (10c) that connects the lubricant reservoir (10b) and the lubricant supply passage (8) is formed in the housing (10). The lubricant supply passage (8) is provided at a position where the lubricant is dropped onto the small diameter side ball (5). Further, the passage diameter of the lubricant supply passage (8) is adjusted so that the amount of lubricant staying inside the bearing (1) is optimized.

  In the figure, the outer diameter of the left raceway surface (3b) of the inner ring (3) is smaller than the outer diameter of the right raceway surface (3a) of the inner ring (3) and the left raceway of the outer ring (2). The inner diameter of the surface (2b) is smaller than the inner diameter of the right raceway surface (2a) of the outer ring (2). The contact angles of the large-diameter side ball (4) and the small-diameter side ball (5) are the same direction (not limited to the same angle). Each retainer (6) (7) is formed in a tapered cylindrical shape whose diameter increases from the left side to the right side as a whole. The pump action of the double row ball bearing (1) has the action of sending the lubricating oil from the left side (namely, small diameter side) to the right side (namely, large diameter side). In this double row ball bearing (1), lubricant is directly supplied to the ball (5) located on the small diameter side (pump action inflow side), and the large diameter side (pump Lubricant is supplied to the balls (4) located on the action discharge side.

  Therefore, the minimum amount of lubricating oil required can be supplied to the contact portion between the ball (4) (5) that requires lubrication and the raceway surface (2a) (3a) (2b) (3b), and the stirring resistance Torque reduction can be achieved without causing an increase in torque.

The bearing device for supporting the rotating shaft of the present invention is suitably used as a bearing device for rotatably supporting the pinion shaft (42) on the housing (41) in the differential gear device for an automobile shown in FIG. The double row ball bearing (1) is lubricated by using a lubricating oil contained in the housing (41). However, a large amount of lubricating oil is not supplied from the small diameter side by oil bath lubrication as in the prior art, but the lubricant is supplied only from the lubricant supply passage (8) provided in the outer ring (2). In the case of oil bath lubrication, the amount of lubricating oil is increased and the stirring resistance is likely to increase.However, in the bearing device for rotating shaft support according to the present invention, as described above, only the lubricant supply passage ( Since 8) is provided, it is easy to keep the amount of lubricating oil supplied to the inside of the bearing (1) properly by adjusting the passage diameter and the like, and the torque can be reduced.

In the above description, the tandem double-row ball bearing (1) having different diameters of the raceway surfaces (2a) (2b) (3a) (3b) has been described, but the lubricant supply passage ( The configuration provided with 8) can also be applied to double-row ball bearings having the same raceway diameter. The bearing device for supporting the rotating shaft of the present invention can be used not only for supporting the pinion shaft of the differential gear device, but also as a bearing for supporting the pinion shaft of the transaxle device.

FIG. 1 is a longitudinal sectional view of an upper half portion showing an embodiment of a bearing device for supporting a rotating shaft of the present invention. FIG. 2 is a longitudinal sectional view showing a differential gear device as an example in which the rotating shaft supporting bearing device of the present invention is used.

(1) Double row ball bearing
(2) Outer ring
(3) Inner ring
(4) Large diameter side ball
(5) Small diameter side ball
(6) Large diameter cage
(7) Small diameter cage
(8) Lubricant supply passage

Claims (3)

A housing, an outer ring attached to the housing, an inner ring attached to the rotating shaft, a plurality of balls arranged in a double row between both wheels, and a double row ball bearing having a cage for holding these balls with which, in double row ball in the bearing, the rotary shaft supporting bearing device to be moved to a larger diameter from the small diameter side lubricating agent by pump action,
Lubricant can be discharged from the end face opening on the downstream side of the pumping action, and the end of the passage provided in the housing is closed by the closing member for supplying the lubricant to the end face opening on the upstream side of the pumping action. As a result, lubricant inflow from the end face opening on the upstream side of the pumping action is prevented, and the lubricant is supplied to the outer ring of the double row ball bearing by dropping the lubricant on the balls located in the upstream side of the pumping action. A bearing device for supporting a rotating shaft , wherein a passage is provided. Double-row ball bearings have an outer ring having a double-row raceway surface having different diameters, an inner ring having a double-row raceway surface corresponding to each raceway surface of the outer ring, and a different pitch between the raceway surfaces of each row of both wheels. A plurality of large-diameter side balls and a plurality of small-diameter side balls arranged with a circular diameter, a large-diameter side cage that holds a plurality of large-diameter side balls, and a small-diameter side cage that holds a plurality of small-diameter side balls The lubricant is supplied from the lubricant supply passage to the small-diameter side ball, and the lubricant is supplied to the large-diameter side ball by the pumping action of the small-diameter side ball. The bearing device for supporting a rotating shaft according to Item 1 . An end portion of a passage provided in the housing is closed by a closing member, so that a lubricant reservoir is formed in the housing, and the lubricant in the housing communicates the lubricant reservoir and the lubricant supply passage with the housing. 3. A bearing device for supporting a rotating shaft according to claim 1, wherein a supply passage is formed .

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