JP2006125565A - Bearing lubrication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the durability of a bearing from lowering by suppressing the leakage of a lubricating oil. <P>SOLUTION: A crankshaft 2 is rotatably pivoted by bearings 1J to 5J at five positions, and first to second internal passages 21 and 22 are formed in the crankshaft 2. The bearings 1J to 5J are cylindrically formed by holding semi-cylindrical upper side bearing members 11A to 11E and lower side bearing members 12A to 12E. The upper side bearing members 11A, 11C, and 11E of the first, third, and fifth bearings 1J, 3J, and 5J are formed of bearing members having partial grooves in the inner peripheral surfaces thereof, and the upper side bearing members 11B and 11D of the other second and fourth bearings 2J and 4J are formed of bearing members having semi-circular grooves in the inner peripheral surfaces thereof. Since the cooling effect of the bearings 1J to 5J can be raised by suppressing the leakage of the lubricating oil, the durability of the bearings 1J to 5J can be prevented from lowering. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a bearing oil supply device, and more particularly, to a bearing oil supply device suitable for supplying oil to, for example, a crankshaft of an automobile engine.

Conventionally, a bearing oil supply device that supports a crankshaft and can supply lubricating oil to a sliding portion of the crankshaft is known (Patent Document 1, Patent Document 2, and Patent Document 3).
Such a conventional bearing oil supply device includes a journal bearing that supports the journal portion of the crankshaft and a connecting rod bearing that supports the crankpin of the crankshaft.
Then, the applicant of the present application described in PCT / JP2003 / 13527 (Patent Document 4), the sliding between the journal bearing and the journal portion of the crankshaft through the radial through hole formed in the journal bearing. A lubricating oil supply device has been proposed in which the lubricating oil is supplied to the inner part and the lubricating oil is supplied from the sliding part to the inner peripheral part of the connecting rod bearing through an internal passage formed in the crankshaft. (FIG. 5 of patent document 4).
JP-A-4-219521 JP-A-5-215125 Japanese Patent Laid-Open No. 7-27127 PCT / JP2003 / 13527

Incidentally, in the apparatus of FIG. 5 of Patent Document 4, the journal portion of the crankshaft is pivotally supported by five journal bearings, of which the upper bearing of the three journal bearings that does not need to supply oil to the connecting rod bearing. A member having no circumferential groove on the inner peripheral surface was used.
By adopting such a configuration, in the apparatus disclosed in FIG. 5 of Patent Document 4, the leakage amount of lubricating oil from the three journal bearings that do not need to supply oil to the connecting rod bearing to both ends in the axial direction is reduced. I try to decrease.
However, in the apparatus disclosed in FIG. 5 of the above-mentioned Patent Document 4, the amount of lubricating oil leaked from the three journal bearings can be reduced, but the three journal bearings and their surroundings are undercooled. There was a disadvantage that the durability of the above-mentioned three journal bearings was lowered.

In view of the circumstances described above, the first aspect of the present invention includes a crankshaft that includes a plurality of crankpins and journal portions, and a plurality of bearings that rotatably support the journal portions of the crankshaft, The semi-cylindrical upper bearing member and the lower bearing member are configured to supply lubricating oil to sliding portions between the bearings and the journal portion through radial holes formed in the upper bearing member. In the bearing oil supply device configured to supply the lubricating oil supplied to the moving part to the sliding part between the crank pin and the connecting rod bearing through an internal passage formed in the crankshaft,
The upper bearing member in the bearing that does not communicate with the internal passage of the crankshaft is a bearing member that has a partial groove along the circumferential direction on the inner peripheral surface, and in the bearing that communicates with the internal passage of the crankshaft. The upper bearing member is composed of a bearing member having a semicircular groove along the circumferential direction on the inner peripheral surface.
Further, the second aspect of the present invention provides a plurality of bearings for rotatably supporting the rotating shaft, and an internal passage formed in the rotating shaft and having a tip portion opened on an outer peripheral surface supported by the bearings. And the lubricating oil is supplied to the sliding portion of the bearing provided with the communication hole and the rotary shaft through the communication hole provided in one bearing member of the bearing, and the inside of the communication hole and the rotary shaft. In the bearing oil supply device that supplies lubricating oil to the sliding portion between the remaining bearing and the rotating shaft through the passage,
The bearing member provided with the communication hole is a bearing member in which a semicircular groove along the circumferential direction is formed on the inner peripheral surface, and the bearing members in the remaining bearings are partial grooves along the circumferential direction on the inner peripheral surface. It is comprised from the bearing member which formed.

According to the first aspect of the present invention, the amount of lubrication oil can be increased with respect to the sliding portion of the bearing where no lubrication is required for the connecting rod bearing, so the durability of the bearing at that position is reduced. Can be prevented.
In addition, according to the second aspect of the present invention, it is possible to suppress an increase in the amount of lubricating oil leaked from each bearing and prevent a decrease in the oil supply pressure to each part of the engine.

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows the essential parts of an in-line four-cylinder automobile engine. In FIG. 1, bearings 1J to 5J are arranged at five shaft support portions 1A to 1E provided in the cylinder block 1, respectively, and the crankshaft 2 is rotatably supported by these bearings 1J to 5J.
The crankshaft 2 includes a first journal portion 2A to a fifth journal portion 2E (a total of five locations) and a first crankpin 2F to a fourth crankpin 2I (a total of four locations) at predetermined intervals in the longitudinal direction. The adjacent journal portions and the crank pins are connected by a connecting portion 2K.
The first journal portion 2A to the fifth journal portion 2E of the crankshaft 2 are rotatably supported by the bearings 1J to 5J at positions corresponding to the first journal portion 2A to the fifth journal portion 2E. A large diameter portion of a connecting rod (not shown) is attached via a connecting rod bearing (not shown).

Each of the bearings 1J to 5J is formed in a cylindrical shape as a whole by tying the semi-cylindrical upper bearing members 11A to 11E and the semi-cylindrical lower bearing members 12A to 12E. Then, the journal parts 2A to 2E of the crankshaft 2 positioned inward of the upper bearing members 11A to 11E and the lower bearing members 12A to 12E constituting the bearings 1J to 5J are pivotally supported. is doing.
The tip portions 3a to 3e of the five branch passages in the oil passage 3 are opened at the upper portions of the shaft support portions 1A to 1E of the cylinder block 1.
On the other hand, a radial hole 13 is formed in a central portion in the circumferential direction of the upper bearing member 11 in each of the bearings 1J to 5J, and these radial holes 13 correspond to the branch passages at positions corresponding to them. The tip portions 3a to 3e are communicated with each other.
On the other hand, the crankshaft 2 is formed with radial passages 14A and 14B formed of radial through holes in the second journal portion 2B and the fourth journal portion 2D.
An inclined passage 15A is formed from one end of the radial passage 14A to the outer peripheral surface of the first crankpin 2F, and an inclined passage 15B is formed from the other end of the radial passage 14A to the outer peripheral surface of the second crankpin 2G. . The radial passage 14A and the inclined passages 15A and 15B constitute a first internal passage 21 through which lubricating oil flows.

On the other hand, an inclined passage 16A is formed from one end of the radial passage 14B to the outer peripheral surface of the third crankpin 2H, and an inclined passage 16B is formed from the other end of the radial passage 14B to the outer peripheral surface of the fourth crankpin 2I. ing. The radial passage 14B and the inclined passages 16A and 16B constitute a second internal passage 22 through which lubricating oil flows.
With this configuration, when the oil pump P connected to the oil passage 3 is operated, the lubricating oil passes through the distal end portions 3a to 3e of the oil passage 3 and the radial holes 13 of the upper bearing members 11A to 11E. The bearings 1J to 5J and the journal portions 2A to 2E are supplied to sliding portions. Further, the lubricating oil supplied to the sliding parts of the second journal part B and the fourth journal part D passes through the first internal passage 21 and the second internal passage 22 provided in the crankshaft 2, and the first crank pin. 2F to the fourth crankpin 2I and a sliding portion between a connecting rod bearing (not shown) are supplied.

Thus, in this embodiment, a bearing member in which a circumferential groove is formed is used as the upper bearing members 11A to 11E in the bearings 1J to 5J.
That is, the bearing member formed with the half circumferential groove 18 shown in FIG. 2 is used as the upper bearing members 11B and 11D of the bearings 2J and 5J that pivotally support the second and fourth journal portions 2B and 2D. The semicircular groove 18 is formed over the entire area (180 degrees) in the circumferential direction of the inner peripheral surface (sliding surface) of the upper bearing members 11B and 11D. The depth and width of the semicircular groove 18 are set to the same dimension over the entire circumferential direction.
On the other hand, as the upper bearing members 11A, 11C, and 11E of the bearings 1J, 3J, and 5J that pivotally support the first, third, and fifth journal portions 2A, 2C, and 2E, the circumferential partial grooves 19 shown in FIG. The bearing member which formed is used. As shown in FIG. 3, the partial groove 19 extends in the circumferential direction of the inner peripheral surface including the center position in the circumferential direction in which the radial hole 13 is formed, and extends slightly before both ends in the circumferential direction. Is formed. The width of the partial groove 19 is set to the same dimension in the circumferential direction, and the depth of the partial groove 19 is deepest at the central portion in the circumferential direction where the radial holes 13 are provided, and from there. Locations near both ends in the circumferential direction are gradually shallower.

As described above, in the present embodiment, the bearings 1J, 3J, and 5J that do not communicate with the internal passages 21 and 22 of the crankshaft 2 are provided with the partial grooves 19 as the upper bearing members 11A, 11C, and 11E. On the other hand, for the bearings 2J and 4J at the portions communicating with both the internal passages 21 and 22 of the crankshaft 2, a bearing member having a half circumferential groove 18 is adopted as the upper bearing members 11B and 11D. Yes.
In addition, as the lower bearing members 12A to 12E in the respective bearings 1J to 5J, the bearing members having no grooves on the inner peripheral surface shown in FIG. 4 are used.

According to the present embodiment configured as described above, the upper bearing member of the bearings 1J, 3J, and 5J in the portion not communicating with both the internal passages 21 and 22 of the crankshaft 2 was used without a groove on the inner peripheral surface. Compared with the prior art (FIG. 5 of Patent Document 4), the amount of lubricating oil supplied to the first, third, and fifth journal portions 2A, 2C, and 2E can be increased.
Therefore, it is possible to satisfactorily prevent the sliding portions of the bearings 1J to 5J supporting the journal portions 2A to 2E and the periphery thereof from being overheated and to prevent the durability of the bearings 1J to 5J from being lowered. it can.

Next, FIG. 5 shows a second embodiment of the present invention. In the second embodiment, four internal passages of the crankshaft 2 are provided, and accordingly, the partial groove 19 shown in FIG. 3 is formed as the upper bearing member 11C of the bearing 3J of the third journal portion 2. A bearing member is used.
More specifically, radial passages 14 are formed in the first and second journal portions 2A and 2B and the fourth and fifth journal portions 2D and 2E in the crankshaft 2, respectively. And the inclined channel | path 15 is each formed from the end of each radial direction hole 14 to the outer peripheral surface of each crankpin 2F-2I of an adjacent position. The first internal passage 21 is constituted by the radial passage 14 and the inclined passage 15 extending from the first journal portion 2A to the first crank pin 2F, and the radial passage extending between the second journal portion 2B and the second crank pin 2G. 14 and the inclined passage 15 constitute a second internal passage 22. Further, the third internal passage 23 is constituted by the inclined passage 15 extending from the radial passage 14 of the fourth journal portion 2D to the third crankpin 2H, and the fourth crankpin is extended from the radial passage 14 of the fifth journal portion 2E. The fourth internal passage 24 is constituted by the inclined passage 15 extending over 2I.
And the bearing 1J (2J, 4J, 5J) of the location connected with each said internal channel | paths 21-24 is a bearing provided with the semicircular groove 18 shown in FIG. 2 as the upper bearing member 11A (11B, 11D, 11E). The member is used.
A radial hole is not formed in the third journal portion 2C, and a bearing member having the partial groove 19 shown in FIG. 3 is used as the upper bearing member 11C of the bearing 3J at that position. Other configurations are the same as those of the first embodiment shown in FIG.
In the second embodiment configured as described above, a bearing member having a partial groove 19 is adopted as the upper bearing member 11C of the bearing 3J for the third journal portion 2C, and the other bearings 1J (2J, 4J, 5J). The upper bearing member 11A (11B, 11D, 11E) having a half circumferential groove 18 is employed.
Therefore, similarly to the first embodiment, the sliding portions of the bearings 1J to 5J and the periphery thereof can be prevented from overheating, and the durability of the bearings 1J to 5J can be prevented from being lowered.

Next, FIG. 6 shows a third embodiment of the present invention. In the third embodiment, the present invention is applied to the camshaft 102 and a plurality of bearings 1J to 4J that rotatably support the camshaft 102.
That is, the camshaft 102 is pivotally supported by four bearings 1J to 4J, and each of the bearings 1J to 4J includes a semi-cylindrical upper bearing member 11A to 11D and a lower bearing member 12A to 12D. Has been.
In the third embodiment, a bearing member having the half circumferential groove 18 shown in FIG. 2 is used as the upper bearing member 11A in the first bearing 1J, and the upper bearing member in the second to fourth bearings 2J to 4J. The bearing members having the partial grooves 19 shown in FIG. 3 are used as 11B to 11D.
The lower bearing members 12A to 12D in the first to fourth bearings 1J to 4J use bearing members having no grooves on the inner peripheral surface shown in FIG. 4 as in the above embodiments.
A radial hole 13 is formed in the upper bearing member of the first bearing 1J so that lubricating oil can be supplied from the pump P toward the radial hole 13 through an oil passage provided in a housing (not shown). It has become. On the other hand, the radial bearing 13 shown in FIG. 3 is not drilled in the upper bearing members 11B to 11D.
On the other hand, in the camshaft 102, an internal passage 121 is formed by an axial hole and four radial holes continuous from the axial hole, and the distal end portions 121a to 121d of the radial holes are respectively connected to the bearings 1J. It is made to open to the outer peripheral surface pivotally supported by 4J.
With this configuration, when the lubricating oil is supplied from the pump to the first bearing 1J, the lubricating oil is supplied to the inner peripheral surface of the first bearing 1J and the sliding portion of the camshaft 102. The lubricating oil is supplied to the sliding portion between the inner peripheral surface of each of the second to fourth bearings 2J to 4J and the camshaft 102 via the internal passage 121 of the camshaft 102.
In such a 3rd Example, compared with the case where the bearing member which has the semicircular groove | channel 18 by 1J is adopted as an upper bearing member of four bearings 1J-4J compared with the case where the bearing member which does not have a groove | channel by 2J-4J is employ | adopted. The amount of leakage of the lubricating oil from the positions of the bearings 1J to 4J to the both ends in the axial direction can be suppressed while effectively cooling the sliding portions of the bearings 1J to 4J.

In the third embodiment, the present invention is applied to the camshaft bearing. However, the present invention can be applied to other bearing devices. For example, the present invention can be applied to an engine balancer shaft. You can also

Sectional drawing of the principal part which shows one Example of this invention. The perspective view which shows the principal part of the upper side bearing member 11B (11D) of FIG. The perspective view which shows the principal part of 11 A of upper side bearing members (11C, 11E) of FIG. The perspective view which shows the principal part of lower side shaft upper member 12A-12E of FIG. Sectional drawing of the principal part which shows 2nd Example of this invention. Sectional drawing of the principal part which shows 3rd Example of this invention.

Explanation of symbols

2 ... crankshaft 2A ... 1st journal part 2B ... 2nd journal part 2C ... 3rd journal part 2D ... 4th journal part 2E ... 5th journal part 2F ... 1st crankpin 2G ... 2nd crankpin 2H ... 3rd Crank pin 2I ... Fourth crank pin 1J-5J ... Bearing 11A-11E ... Upper bearing member 12A-12E ... Lower bearing member 13 ... Radial passage 18 ... Half circumferential groove 19 ... Partial groove 21 ... First internal passage 22 ... First 2 Internal passage 23 ... 3rd internal passage 24 ... 4th internal passage 102 ... Cam shaft (rotating shaft) 121 ... Internal passage

Claims (4)

A crankshaft comprising a plurality of crankpins and a journal portion; and a plurality of bearings for rotatably supporting the journal portion of the crankshaft, each of the bearings being a semi-cylindrical upper bearing member and a lower bearing member; The lubricating oil is supplied to the sliding portions between the bearings and the journal portion through radial holes formed in the upper bearing member, and the lubricating oil supplied to the sliding portions is supplied to the crankshaft. In the bearing oil supply device configured to supply the sliding portion between the crankpin and the connecting rod bearing through the formed internal passage,
The upper bearing member in the bearing that does not communicate with the internal passage of the crankshaft is a bearing member that has a partial groove along the circumferential direction on the inner peripheral surface, and in the bearing that communicates with the internal passage of the crankshaft. The upper bearing member comprises a bearing member having a semicircular groove along the circumferential direction on the inner circumferential surface.   The crankshaft includes first to fourth four crankpins, first to fifth journal portions, a first internal passage provided across the first crankpin, the second journal portion, and the second crankpin. And an upper bearing member of a bearing that pivotally supports the first, third, and fifth journal portions, and includes a third groove pin and a second internal passage provided across the fourth journal portion and the fourth crank pin. 2. The bearing oil supply device according to claim 1, wherein the upper bearing member of the bearing that supports the second and fourth journal portions includes a bearing member having a semicircular groove.   The crankshaft includes first to fourth four crankpins, first to fifth journal portions, a first internal passage provided across the first journal portion and the first crankpin, and a second A second internal passage provided across the journal portion and the second crankpin, a third internal passage provided across the fourth journal portion and the third crankpin, and a fourth internal passage provided across the fifth journal portion and the fourth crankpin The upper bearing member of the bearing that pivotally supports the third journal portion is a bearing having a partial groove, and the upper bearing member of the bearing that pivotally supports the first, second, fourth, and fifth journal portions is The bearing oil supply device according to claim 1, comprising a bearing member having a semicircular groove. A plurality of bearings that rotatably support the rotating shaft, and an internal passage formed in the rotating shaft and having an end portion opened to an outer peripheral surface that is supported by each of the bearings. Lubricating oil is supplied to the sliding portion of the bearing provided with the communication hole and the rotary shaft through the communication hole provided in the bearing member, and rotated with the remaining bearings via the communication hole and the internal passage of the rotary shaft. In the bearing oil supply device that supplies lubricating oil to the sliding part with the shaft,
The bearing member provided with the communication hole is a bearing member in which a semicircular groove along the circumferential direction is formed on the inner peripheral surface, and the bearing members in the remaining bearings are partial grooves along the circumferential direction on the inner peripheral surface. A bearing oiling device comprising a bearing member formed with a bearing.

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