JP5987290B2 - Bearing device - Google Patents

Description

  The present invention relates to a bearing device used, for example, to rotatably support an engine crankshaft or the like.

  A crankshaft of an engine such as an automobile is integrally formed with a crank arm and a crankpin that constitute the crank. For this reason, a split bearing that is divided in the circumferential direction is used as a bearing that is arranged in a crank journal provided between the crank arms and supports the crankshaft with respect to the engine block.

  Conventionally, a sliding bearing has been used as the split bearing. Since the sliding bearing rotatably supports the rotating shaft by an oil film formed by lubricating oil, a relatively large amount of lubricating oil needs to be supplied. For this reason, normally, the housing to which the sliding bearing is fixed is provided with an oil supply hole for supplying lubricating oil between the sliding surface of the sliding bearing and the rotating shaft, and the lubricating oil pumped by a hydraulic pump or the like is provided. Oil is supplied between the sliding surface and the rotating shaft.

On the other hand, in order to satisfy recent high demands on economy and environment, rolling bearings that can reduce rotational torque may be used instead of sliding bearings.
As the rolling bearing used in place of the sliding bearing, a split type rolling bearing in which the rotating shaft is supported via a plurality of cylindrical rollers and the outer ring is divided into two can be used (for example, see Patent Document 1). .

JP 2006-234074 A

  For example, when a rolling bearing is used instead of a sliding bearing for an engine that employs the above-described sliding bearing, it is conceivable to use the lubrication hole used for lubrication of the sliding bearing as it is for lubricating the rolling bearing. .

However, since the split type rolling bearing has rolling elements such as cylindrical rollers, for example, if the amount of oil supplied to the inside of the bearing is extremely large, the rotational torque increases conversely due to the viscous resistance due to the lubricating oil. Sometimes. For this reason, if lubricating oil having the same amount of oil as that of a sliding bearing that requires supply of a relatively large amount of lubricating oil is supplied into the bearing, the rotational torque may be increased. For this reason, it is necessary to adjust to the lubricating oil supply amount corresponding to a rolling bearing.
Although a measure of adjusting the amount of oil supplied from the oil supply hole provided in the housing on the engine side is also conceivable, this measure is not preferable from the viewpoint of cost because it forces a change in the hydraulic system on the engine side.

  The present invention has been made in view of such circumstances, and even in an environment where a relatively large amount of lubricating oil is supplied, the supply amount of the lubricating oil to the inside of the bearing is effectively reduced to provide an appropriate supply. It aims at providing the bearing apparatus which can be adjusted to quantity.

The present invention comprises a housing having a support hole, an outer ring fitted and fixed to the support hole, and a plurality of rolling elements that roll on an outer ring raceway formed on an inner peripheral surface of the outer ring, A rolling bearing that is rotatably supported with respect to the housing, and the housing is provided with an oil supply hole that opens on an inner peripheral surface of the support hole, and the lubricating oil is passed through the oil supply hole to the inside of the rolling bearing. In the bearing device supplied to the outer ring, the outer ring is provided with an oil supply port for passing the outer ring in the radial direction and supplying the lubricating oil into the bearing, and on the outer peripheral surface of the outer ring, A groove portion connecting the oil supply port and the oil supply hole is formed so as to be recessed in the radial direction with respect to the outer peripheral surface, and the cross-sectional area of the groove portion is a flow rate of lubricating oil supplied from the oil supply hole to the oil supply port. It is set to narrow value, the groove of the lubricating oil It is characterized in Rukoto to have a bent portion that converts the dynamic direction.

  According to the bearing device having the above-described configuration, a groove portion that connects the oil supply port and the oil supply hole is formed on the outer peripheral surface of the outer ring, and the cross-sectional area of the groove portion is a flow rate of the lubricating oil supplied from the oil supply hole to the oil supply port. Since it is set to the value to be squeezed, the flow resistance when the lubricating oil passes from the oil supply hole toward the groove portion can be increased. As a result, even if the amount of lubricating oil supplied from the oil supply hole is large, the flow rate in the groove portion can be limited against the pressure of the lubricating oil that is increasing, so that a relatively large amount of lubricating oil can be obtained. Even in a supplied environment, it is possible to effectively reduce the supply amount of the lubricating oil into the bearing and adjust it to an appropriate supply amount.

  In the bearing device, it is preferable that a cross-sectional area of the oil supply port is set to a value that restricts a flow rate of the lubricant supplied from the groove into the bearing, and in this case, the lubricating oil is directed from the groove toward the oil supply port. The flow resistance when passing through can be increased. Thereby, the flow volume of the lubricating oil supplied from the oil supply hole can be further limited.

In the bearing device, the groove portion may have a bent portion that changes a flow direction of the lubricating oil.
In this case, the flow resistance of the lubricating oil passing through the groove can be increased by the bent portion, and the passage path through which the lubricating oil passes can be made longer, and as a result, the flow resistance of the lubricating oil can be further increased. it can.

  According to the present invention, even in an environment where a relatively large amount of lubricating oil is supplied, the amount of lubricating oil supplied to the inside of the bearing can be effectively reduced and adjusted to an appropriate amount.

It is sectional drawing of the bearing apparatus which concerns on one Embodiment of this invention. (A) is II-II sectional drawing in FIG. 1, FIG.2 (b) is a partial external view of the outer peripheral surface of an outer ring | wheel, and is the figure which showed the part corresponding to the position of an oil supply hole. . It is a figure which shows the other example of the groove part formed in the outer peripheral surface of an outer ring | wheel. It is the outer ring sectional view exaggeratingly showing the groove part extended in the peripheral direction. It is an outer ring sectional view at the time of providing a pair of oiling mouths, and shows a groove part exaggeratingly.

Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a bearing device according to an embodiment of the present invention.
In FIG. 1, the bearing device of the present embodiment is for supporting a crankshaft of an automobile engine, and includes a housing 1 for supporting a crankshaft and a split type rolling bearing 10 fixed to the housing 1. I have.

The housing 1 includes an upper block 2 provided on a cylinder block side (not shown) and a bearing cap 4 fixed to the upper block 2.
The bearing cap 4 is fixed to the upper block 2 by fixing bolts 6. The housing 1 constituted by the upper block 2 and the bearing cap 4 is formed with a support hole 3 for supporting the split type rolling bearing 10 formed in a cylindrical hole shape. A split type rolling bearing 10 is press-fitted on the inner peripheral surface side of the support hole 3.

  The upper block 2 is formed with an oil supply hole 7 for supplying lubricating oil to the split type rolling bearing 10. The oil supply hole 7 is formed so as to extend through the upper block 2 from obliquely upward (obliquely upward in FIG. 1) and open to the support hole 3. The opening of the support hole 3 in the oil supply hole 7 is connected to an oil supply path for supplying lubricating oil into the bearing of the split type rolling bearing 10 described later.

The split type rolling bearing 10 is disposed between the support hole 3 and the crankshaft 5 and supports the crankshaft 5 so as to be rotatable with respect to the cylinder block.
The split type rolling bearing 10 includes an outer ring 11 that is closely fitted and fixed to the inner peripheral surface of the support hole 3, a plurality of rollers 12 that are rotatably disposed on the inner peripheral surface 11 a of the outer ring 11, and And a cage 13 for holding the rollers 12 so as to be arranged at substantially equal intervals in the circumferential direction. The plurality of rollers 12 are in contact with the crank journal 5a of the crankshaft 5, and roll on the outer peripheral surface of the crank journal 5a. That is, the split type rolling bearing 10 uses the crank journal 5a as a member on the inner ring side.

  The outer ring 11 is configured by combining a set of half-split outer ring members 14 divided into two in the circumferential direction. The retainer 13 is also configured by combining a pair of half members 15 that are also divided in the circumferential direction, and the split type rolling bearing 10 is installed in the circumferential direction to be attached to the crank journal 5a. Can be divided into two.

2A is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. 2B is a partial external view of the outer peripheral surface of the outer ring 11 and shows a portion corresponding to the position of the oil supply hole 7. It is a figure.
The outer ring 11 is provided with a fuel filler port 20 that penetrates the outer ring 11 in the radial direction.
Further, a groove portion 21 that connects the fuel filler opening 20 and the fuel filler hole 7 is formed on the outer peripheral surface 11 b of the outer ring 11.

  The groove portion 21 is formed so as to be recessed in the radial direction with respect to the outer peripheral surface 11 b of the outer ring 11. The upper opening 20 a that opens to the outer peripheral surface 11 b side at the fuel filler port 20 and the inner peripheral surface 3 a of the support hole 3. It is extended in the shape of a straight line along the axial direction so as to connect the portion corresponding to the oil supply hole 7 that is open to the top. Both the groove depths of the groove portions 21 are set to 1 mm, for example.

The groove portion 21 is covered with the inner peripheral surface 3 a of the support hole 3 on the outer peripheral side of the groove portion 21, thereby forming an oil supply path R that extends linearly so as to connect the oil supply port 20 and the oil supply hole 7. doing.
The oil supply path R guides the lubricating oil supplied from the oil supply hole 7 to the oil supply port 20 by connecting the oil supply hole 7 and the oil supply port 20. The lubricating oil guided to the oil filler port 20 is supplied into the bearing through the oil filler port 20.

The oil filler port 20 is provided through the outer ring 11 in the radial direction, thereby supplying lubricating oil supplied from the outer peripheral surface 11b side of the outer ring 11 into the bearing. The oil supply port 20 has a function as an orifice for reducing the supply amount of the lubricating oil supplied into the bearing. Therefore, the amount of lubricating oil supplied to the inside of the bearing can be adjusted by adjusting the inner diameter of the oil supply port 20.
The inner diameter of the oil supply port 20 is set according to the viscosity of the lubricating oil, and is set to 0.5 to 1 mm, for example.

The oil supply path R is formed by the groove portion 21 whose groove depth is set to 1 mm as described above, and thus has a very narrow cross-sectional area. As shown in FIGS. 2A and 2B, the oil supply path R has a cross-sectional area set smaller than the cross-sectional area of the oil supply hole 7. The cross-sectional area of the oil supply path R (groove portion 21) is set to a value for reducing the flow rate of the lubricating oil supplied from the oil supply hole 7 to the oil supply port 20. For this reason, when lubricating oil passes through this oil supply path R, high flow resistance arises.
Furthermore, the cross-sectional area of the oil supply port 20 is also set to a value that restricts the flow rate of the lubricating oil supplied from the oil supply path R (groove portion 21) into the bearing.

  According to the bearing device configured as described above, the outer circumferential surface 11 b of the outer ring 11 is formed with the groove portion 21 that connects the oil supply port 20 and the oil supply hole 7, and the cross-sectional area of the groove portion 21 extends from the oil supply hole 7. Since the flow rate of the lubricating oil supplied to the oil supply port 20 is set to a value that restricts the flow rate, the flow resistance when the lubricating oil passes from the oil supply hole 7 toward the groove portion 21 can be increased. As a result, even if the amount of lubricating oil supplied from the oil supply hole 7 is large, the flow rate in the groove portion 21 can be limited against the increasing pressure of the lubricating oil. Even in an environment where oil is supplied, the supply amount of lubricating oil into the bearing can be effectively reduced and adjusted appropriately.

  Further, in the present embodiment, the cross-sectional area of the oil supply port 20 is set to a value that restricts the flow rate of the lubricating oil supplied from the oil supply path R (groove portion 21) into the bearing. For this reason, the flow resistance when the lubricating oil passes from the groove portion 21 toward the oil supply port 20 can be increased, and the flow rate of the lubricating oil supplied from the oil supply hole 7 can be further limited.

  In the present embodiment, the oil supply path R is formed by the groove portion 21 having the groove depth set to 1 mm as described above. However, the groove depth is appropriately adjusted depending on the viscosity of the lubricating oil and the like. It is also possible to set a smaller size within a range where the foreign matter to be mixed is not boring. Specifically, it is preferable that the groove depth and the groove width are set in a range from a maximum of 1 mm to a minimum of 0.02 mm while adjusting the cross-sectional area.

  In the above embodiment, the case where the linear oil supply path R is formed by extending the groove portion 21 linearly along the axial direction has been shown. For example, as shown in FIG. A bent portion 21a for changing the flow direction may be provided in the groove portion 21, and the groove portion 21 may be formed in a U shape on the outer peripheral surface 11b of the outer ring 11, or in an L shape as shown in FIG. It may be formed. In this case, since the oil supply path R is also formed by bending, the oil supply path R can have a so-called labyrinth structure. As a result, the flow resistance of the lubricating oil passing through the groove 21 can be increased by the bent portion 21a, and the passage path through which the lubricating oil passes can be made longer. As a result, the flow rate of the lubricating oil is further increased. be able to.

  The present invention is not limited to the above embodiments. In the above embodiment, the case where the split type rolling bearing 10 is used is illustrated, but this bearing device is not limited to the split type rolling bearing, and a rolling bearing having a normal outer ring formed in an annular shape may be used. it can.

In the case of a rolling bearing having a normal outer ring formed in an annular shape, for example, as shown in FIG. 4A, an oil supply port 20 is provided at a position approximately 180 degrees in the circumferential direction with respect to the oil supply hole 7, 7 and the fuel filler opening 20 can be connected so that the groove portion 21 can be formed over almost the entire circumference of the outer peripheral surface 11 b of the outer ring 11.
Further, as shown in FIG. 4 (b), an oil supply port 20 is provided adjacent to the oil supply hole 7, and a groove portion 21 is provided over substantially the entire circumference of the outer peripheral surface 11 b of the outer ring 11. The mouth 20 can also be connected.

As the length of the oil supply path R (groove portion 21) is longer, the flow rate of the lubricating oil can be limited by the flow resistance. Therefore, by extending the oil supply path R along the circumferential direction as shown in FIG. The amount of lubricating oil supplied to the inside of the bearing can be adjusted by adjusting the length.
In particular, since the supply of the lubricating oil from the oil supply hole 7 may be pumped and supplied by a hydraulic pump or the like, in such a case, lubrication to the inside of the bearing can be achieved by appropriately extending the length of the oil supply path R. The amount of oil supply can be adjusted appropriately.

  4 shows the case where the groove portion 21 is extended in one circumferential direction. For example, the groove portion 21 is extended in one circumferential direction by a predetermined length, is further folded back, returned to the other circumferential direction, and reciprocated in the circumferential direction. As described above, the groove portion 21 can also be formed.

Further, as shown in FIG. 5, the outer ring 11 may be provided with a pair of oil supply ports 20 so as to be positioned at approximately 180 degrees in the circumferential direction, and the groove portion 21 may be provided so as to connect the pair of oil supply ports 20. In this case, the oil supply hole 7 is connected to an intermediate portion between the pair of oil supply ports 20 in the oil supply path R.
In this way, by providing a pair of the oil supply ports 20, the lubricating oil can be evenly supplied into the bearing. Note that a larger number of the fuel filler ports 20 may be provided. However, as described above, the oil filler port 20 has a function as an orifice for adjusting the amount of lubricating oil supplied to the inside of the bearing. The amount of lubricating oil supplied to the plant will also increase.
In this case, by reducing the inner diameter of each oil supply port 20, the supply amount of the lubricant oil from each oil supply port 20 is adjusted to be small, and the supply amount of the lubricant oil inside the bearing as a whole is appropriately adjusted. Can be adjusted.

DESCRIPTION OF SYMBOLS 1: Housing 3: Support hole 3a: Inner peripheral surface 5: Crankshaft 7: Oil supply hole 10: Split type rolling bearing (rolling bearing part) 11: Outer ring 11a: Inner peripheral surface 11b: Outer peripheral surface 12: Roller 20: Oil supply port 21: Groove

Claims (2)

A housing having a support hole;
A rolling bearing that includes an outer ring that is externally fitted and fixed in the support hole, and a plurality of rolling elements that roll on an outer ring raceway formed on an inner peripheral surface of the outer ring, and that rotatably supports the rotating shaft with respect to the housing. And comprising
In the bearing device, an oil supply hole is formed in the inner peripheral surface of the support hole, and lubricating oil is supplied to the inside of the rolling bearing through the oil supply hole.
The outer ring is provided with an oil supply port that passes through the outer ring in the radial direction and supplies the lubricating oil to the inside of the bearing, and an outer peripheral surface of the outer ring has the oil supply port and the oil supply hole. Is formed so as to be recessed in the radial direction with respect to the outer peripheral surface,
The cross-sectional area of the groove is set to a value for reducing the flow rate of the lubricating oil supplied from the oil supply hole to the oil supply port ,
Bearing device according to claim Rukoto to have a bent portion in which the groove is converted to the flow direction of the lubricating oil.   The bearing device according to claim 1, wherein a cross-sectional area of the oil supply port is set to a value that restricts a flow rate of the lubricating oil supplied from the groove portion into the bearing.

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