JP2016191437A - Oil ring type sliding bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase oil supplied to a bearing metal when employing an oil ring type sliding bearing.SOLUTION: The oil ring type sliding bearing (1) includes a first space (201) including an outer surface of an oil ring (14a). The first space (201) becomes narrower along a rotation direction of the oil ring (14a) and has the narrowest part on a downstream side in the rotation direction when viewed from an apex part of the oil ring (14a).SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil ring type plain bearing.

  Conventionally, an oil ring type bearing device has been known. Each of the bearings includes an upper bearing metal and a lower bearing metal each having a substantially semi-cylindrical shape, and constitutes one cylinder by fixing them together. A groove for accommodating the oil ring is provided in the center portion of the upper bearing metal, and the oil ring is suspended on the shaft while being rotatably accommodated in the groove. The lower part of the oil ring is immersed in the oil stored below the lower bearing metal, and when the shaft rotates, the oil ring suspended on the shaft rotates following the shaft and scoops up the oil. This operation lubricates the bearing metal with oil.

  Since such an oil ring type lubrication method uses a simple structure, there is a merit that the cost is lower than a forced lubrication type lubrication method in which an oil pump is separately provided and oil is supplied. There is also a disadvantage that the amount is small.

  Therefore, as a prior art, a bearing device has been proposed in which an oil amount adjusting device is attached at a position where the oil ring can be contacted and separated from the outer periphery of the oil ring so as to scrape off the oil adhering to the oil ring and efficiently supply the oil to the bearing metal. (See Patent Document 1).

Japanese Utility Model Publication No. 61-146690 (published on September 10, 1986)

  However, in the bearing device described in Patent Document 1, in order to adjust the oil amount, the oil amount adjustment frame must be adjusted with respect to the oil ring, and the oil amount adjustment frame must be fastened to the fixed pipe with a bolt and fixed. It must be complicated. Therefore, an oil ring type plain bearing that can be efficiently supplied to the bearing metal by scraping off the oil adhering to the oil ring is expected.

  In view of the above problems, an object of the present invention is to increase the amount of oil supplied to the bearing metal when an oil ring type plain bearing is employed.

  In order to solve the above-described problems, an oil ring type plain bearing according to the present invention includes a shaft, a bearing metal that supports the shaft, a suspension of the shaft, and the rotation of the shaft. An oil ring that scoops up the oil below, and a gradually decreasing space that includes the outer surface of the oil ring, the gradually decreasing space gradually narrowing along the rotational direction of the oil ring, and at the upper half of the shaft It is narrowest on the downstream side in the rotational direction when viewed from the top of the oil ring.

  According to the above configuration, the oil ring rotates with the rotation of the shaft, the oil accumulated below the shaft adheres to the oil ring, and is scraped up above the shaft with the rotation of the oil ring. Become.

  When the oil attached to the outer surface of the oil ring begins to pass through the gradually decreasing space, the oil is blocked by the gradually decreasing space that gradually narrows along the rotation direction. By this damming, oil overflows from the gradually decreasing space, and in the conventional case, oil that has been attached to the oil ring and returned to the lower side of the bearing metal can be supplied to the bearing metal again. A sufficient amount of oil can be supplied even when a type bearing is employed.

  The gradually decreasing space is preferably a space including at least the upper surface of the oil ring.

  According to the said structure, the oil adhering to the upper surface of an oil ring can be supplied to a bearing metal.

  The gradually decreasing space is preferably a space including at least a side surface of the oil ring.

  According to the said structure, the oil adhering to the side surface of an oil ring can be supplied to a bearing metal.

  It is preferable to include a first space including the upper surface of the oil ring and a second space that guides the oil that is connected to the first space and overflows from the gradually decreasing space to the bearing metal.

  According to the above configuration, oil leaking from the gradually decreasing space can be efficiently supplied to the sliding contact surface between the shaft and the bearing metal through the second space.

  It is preferable that the bearing metal has an oil receiving port through which oil is guided through the second space, and the oil in the oil receiving port is supplied to a sliding contact surface between the shaft and the bearing metal.

  According to the said structure, since it has the oil receptacle which receives oil from 2nd space, oil can be reliably supplied to the sliding contact surface of a shaft and a bearing metal.

  The positioning unit further includes a positioning unit that determines the position of the oil ring in the axial direction, and the positioning unit has a facing portion that faces the outer surface of the oil ring, and the facing portion extends along the rotation direction of the oil ring. It is preferable that the gap between the oil ring and the outer surface is reduced.

  The present invention has an effect that the amount of oil supplied to the sliding contact surface between the shaft and the bearing metal can be increased when the oil ring type plain bearing is employed.

It is sectional drawing which looked at the oil ring type plain bearing which concerns on one Embodiment of this invention from the axial direction. FIG. 2 is a cross-sectional view taken along line X ₁ -X _{1 in} FIG. 1. It is a perspective view of the oil ring guide of the oil ring type plain bearing which concerns on the said embodiment. It is an enlarged view of the oil ring type plain bearing which concerns on the said embodiment, (a)-(d) is explanatory drawing explaining 1st space, (e) demonstrates 1st-4th space. It is explanatory drawing. It is another enlarged view of the oil ring type plain bearing which concerns on the said embodiment, (a)-(d) is explanatory drawing explaining 2nd space, (e) is 1st-4th space. It is explanatory drawing demonstrated. It is sectional drawing which looked at the oil ring type plain bearing which concerns on other embodiment of this invention from the axial direction. FIG. 7 is a cross-sectional view taken along line X ₂ -X _{2 in} FIG. 6. It is explanatory drawing for demonstrating the 1st space and 2nd space of the oil ring type slide bearing which concerns on the said other embodiment. It is an enlarged view of the oil ring type plain bearing which concerns on the said other embodiment, (a)-(d) is explanatory drawing explaining 1st space, (e) is 1st-4th space. It is explanatory drawing demonstrated. It is another enlarged view of the oil ring type plain bearing which concerns on said other embodiment, (a)-(d) is explanatory drawing explaining 2nd space, (e) is 1st-4th. It is explanatory drawing explaining space. It is AA arrow sectional drawing of FIG. It is a perspective view of the oil ring guide of the oil ring type plain bearing which concerns on the said other embodiment. It is an enlarged view of the axis | shaft, bearing metal, oil ring, and oil ring guide of the oil ring type plain bearing which concerns on the said other embodiment. It is an enlarged view of the axis | shaft, bearing metal, oil ring, and oil ring guide of the oil ring type plain bearing which concerns on the said other embodiment. It is a perspective view of the upper bearing metal and lower bearing metal of the oil ring type slide bearing which concerns on the said other embodiment. It is the modification in the AA arrow directional cross section of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the same or similar parts are denoted by the same or similar reference numerals, and those having the same or similar reference numerals in the drawings may be omitted. In addition, the dimensions, materials, shapes, relative arrangements, processing methods, and the like of the configurations described in the present embodiment are merely one embodiment, and the scope of the present invention should not be construed as being limited thereto. Further, the drawings are schematic, and the ratio and shape of dimensions are different from actual ones.

Embodiment 1
FIG.1 and FIG.2 is a figure which shows schematic structure of the oil ring type slide bearing 1 which concerns on this embodiment. FIG. 1 is a cross-sectional view of the oil ring type plain bearing 1 as seen from the axial direction of the shaft 11. 2 is a cross-sectional view taken along line X ₁ -X ₁ in FIG.

  FIG. 3 is a perspective view of an oil ring guide 15 a used in the oil ring type plain bearing 1. As shown in FIG. 3, the oil ring guide 15 a includes a first member 51 and a second member 52. The oil ring guide 15a is attached to the end surface of the upper bearing metal 12 so that the first member 51 faces the upper surface of the oil ring 14a and the second member 52 faces the side surface of the oil ring 14a.

The first member 51 faces the upper surface of the oil ring 14a, thereby forming a space 201 (hereinafter referred to as “first space”) from the upstream side to the downstream side in the rotational direction of the top of the oil ring 14a (see FIG. 4 (e)). The first space 201 has the narrowest part of the first member 51 in the rotation direction. Specifically, it is shown in FIG. As shown in (a), the first space 201 changes in cross section OY ₁ , OY ₂ , OY ₃ in the rotation direction. The distance between the upper surface of the first member 51 and the oil ring 14a is, _a 1, _a 2, varies so as to gradually narrow as _{a 3} shown in (d) of that shown in (c) shown in (b), _{a 3} It becomes the narrowest at the front of the rotation direction. When passing through the narrowest part, the distance between the upper surface of the oil ring 14a and the first member 51 is increased again. That is, a gradually decreasing space is formed in which the space gradually decreases from the upstream side to the downstream side in the rotation direction near the top of the oil ring 14a.

  The second member 52 forms a space (hereinafter referred to as “second space”) 202 connected to the first space 201 by facing the side surface of the oil ring 14a (see FIG. 4E). Note that one side surface of the oil ring 14 a faces the second member 52 as described above, and the other side surface faces the end surface of the upper bearing metal 12. Similar to the second member 52, the end surface of the upper bearing metal 12 faces the side surface of the oil ring 14a to form a space connected to the first space 201. The space is also included in the second space 202 described above.

  Hereinafter, the action of blocking oil in the first space 201 and the second space 202 and guiding it to the sliding contact surface between the shaft 11 and the bearing metal will be described. As the shaft 11 rotates, the oil ring 14 a is rotated, and the oil accumulated in the oil tank 22 adheres to the oil ring 14 a and is scraped up above the shaft 11. When the oil that has been scraped up and adheres to the upper surface of the oil ring 14a begins to pass through the first space 201, the oil starts from the narrowest portion of the first space 201 that gradually narrows along the rotation direction. I can be dammed up. The dammed oil gradually overflows from the first space 201. That is, conventionally, the oil that has been returned to the oil tank 22 while being attached to the oil ring 14a is dammed up, so that the raised oil is not returned to the oil tank 22 as it is. It can be supplied to the bearing metal 13.

  Depending on the characteristics such as the viscosity of the oil and the rotational speed of the oil ring 14a, the oil blocked in the first space 201 is from the downstream side in the rotation direction when viewed from the top of the oil ring 14a in the first space 201. It may overflow, or it may overflow from the upstream side in the rotational direction when viewed from the top of the oil ring 14a.

  The second space 202 is a space where the end surfaces of the second member 52 and the upper bearing metal 12 and the side surface of the oil ring 14 a face each other, and oil overflows from the first space 201 and is supplied to the lower bearing metal 13. The second space 202 includes a third space 203 and a fourth space 204.

  The third space 203 is a space formed by the side surface of the oil ring 14 a and the oil ring guide 15 a in the second space 202. By providing the third space 203, the oil leaking from the first space 201 closes the passage in the circumferential direction and falls downward. The third space 203 is located in the direction in which oil leaks from the first space 201 as described above, and most of the oil leaking from the first space 201 passes through the third space 203 by the second member 52. It is guided to the fourth space 204.

  The fourth space 204 is a space that connects the third space 203 and the lower bearing metal 13. The oil overflowing from the first space 201 to the third space 203 is supplied to the lower bearing metal 13 via the fourth space 204.

  Thus, according to the oil ring type plain bearing 1 according to the present embodiment, when the oil attached to the oil ring 14a starts to pass through the first space 201 due to the rotation of the oil ring 14a, the oil is rotated in the rotation direction. The first space 201 that gradually narrows along the line is dammed starting from the narrowest portion, and overflows from the first space 201 to the second space 202. Therefore, conventionally, the oil returned to the oil tank 22 while being attached to the oil ring 14a can be supplied to the lower bearing metal 13 from the side surface of the oil ring 14a.

In the above-described embodiment, the form in which the first space 201 is a gradually decreasing space has been described. However, like the first space 201, a part of the second space 202 (the third space 203) is along the rotation direction of the oil ring 14a. It may be a gradually decreasing space that gradually becomes narrower. Specifically, it is shown in FIG. As shown in (a), the second space 202 changes to cross sections OZ ₁ , OZ ₂ , and OZ ₃ in the rotational direction. The distance between the second member 52 and the side surface of the oil ring 14a changes to b ₁ shown in (b), b ₂ shown in (c), and b ₃ shown in (d), and is the narrowest at b ₃ . Similarly, the distance between the end face of the upper bearing metal 12 and the side surface of the oil ring 14a is gradually reduced to c ₁ shown in (b), c ₂ shown in (c), and c ₃ shown in (d). altered, narrowest at _{c 3.} When the oil adhering to the side surface of the oil ring 14a starts to pass through the second space 202 due to the rotation of the oil ring 14a, the oil moves to the narrowest portion of the second space 202 that gradually narrows along the rotation direction. Dammed as a starting point. Similar to the first space 201, such oil can be supplied to the lower bearing metal 13 through the second space 202.

  In the above-described embodiment, the gradually decreasing space that gradually narrows the first space 201 or the second space 202 has been described. However, as described above, both of the first space 201 and the second space 202 are formed on the oil ring 14a. You may make it become narrow gradually along a rotation direction.

  Further, in the second space 202, only one of the distance between the second member 52 and the side surface of the oil ring 14a or the distance between the end surface of the upper bearing metal 12 and the side surface of the oil ring 14a may be gradually narrowed.

  In the present specification, the upper surface and the side surface of the oil ring 14a are collectively expressed as an “outer surface”.

[Embodiment 2]
Next, Embodiment 2 of the present invention will be described. In addition, the same code | symbol is attached | subjected to corresponding parts between this embodiment and the said Embodiment 1. FIG.

(Schematic configuration of oil ring type plain bearing 1)
6 and 7 are views showing a schematic structure of the oil ring type plain bearing 1 according to the second embodiment of the present invention. Figure 6 is a cross-sectional view of the oil ring type sliding bearing 1 in the axial direction of the shaft 11, FIG. 7 is a X ₂ -X ₂ cross-sectional view taken along line of FIG.

  The oil ring type plain bearing 1 includes a shaft 11, an upper bearing metal 12, a lower bearing metal 13, an oil ring 14a, an oil ring 14b, an oil ring guide 15a, and an oil ring guide 15b. . The oil ring type plain bearing 1 is accommodated in the housing 21a, as shown in FIGS. The housing 21a is provided with a through hole penetrating in the axial direction of the shaft 11, and the oil ring type plain bearing 1 is held by a bearing holding portion 21b in the housing 21a so that the shaft 11 passes through the through hole. The housing 21 a and the bearing holding portion 21 b are integrally formed to constitute a bearing housing 21 that surrounds the oil ring type slide bearing 1.

  The shaft 11 is rotationally driven by a driving device (not shown) such as a motor installed outside the housing 21a.

  The upper bearing metal 12 and the lower bearing metal 13 constitute one cylindrical bearing metal by being integrally fixed with bolts via opposing joint surfaces. A metal layer made of a metal material such as white metal is formed on the sliding contact surfaces of the upper bearing metal 12 and the lower bearing metal 13 with the shaft 11. Each metal layer of the upper bearing metal 12 and the lower bearing metal 13 supports the shaft 11 in a rotatable manner.

  The oil ring 14a and the oil ring 14b are suspended on the shaft 11 so as to be freely rotatable. Each lower part of the oil ring 14a and the oil ring 14b is immersed in the oil in the oil tank 22, as shown in FIG. With the rotation of the shaft 11, the oil ring 14 a and the oil ring 14 b are rotated, and the oil stored in the oil tank 22 is scraped up above the shaft 11.

  The oil ring guide 15a and the oil ring guide 15b are positioning members that determine the positions of the oil ring 14a and the oil ring 14b suspended from the shaft 11 in the axial direction on the shaft 11, respectively. It is one of the members constituting the space from the oil ring 14b to the lower bearing metal 13. The oil ring guide 15a and the oil ring guide 15b are fixed to the respective end surfaces by screwing into the screw holes provided on the respective end surfaces of the upper bearing metal 12 with set screws, and the oil ring 14a and the oil ring 14b are connected to each other. Store. The oil ring guide 15a and the oil ring guide 15b are manufactured by sheet metal processing, for example.

  The oil ring guide 15a and the oil ring guide 15b constitute spaces for accommodating the oil ring 14a and the oil ring 14b, respectively, between the end surfaces of the upper bearing metal 12. In the oil ring slide bearing 1, an oil ring guide 15a and an oil ring guide 15b are disposed on each end face of the upper bearing metal 12, and each end face of the upper bearing metal 12 is constituted by the oil ring guide 15a and the oil ring guide 15b. The oil ring 14a and the oil ring 14b are stored in the space.

  As shown in FIG. 11, the oil ring guide 15a is provided with a protruding portion 16a-1 protruding toward the inside of the space described above. Similarly, the end face of the upper bearing metal 12 is provided with a protrusion 16a-2 that protrudes toward the inside of the space described above. For example, the protrusion 16a-1 is configured such that the low head bolt 16A-1 is passed through the bolt hole of the oil ring guide 15a and the head (that is, the protrusion 16a-1) is disposed in the space. The shaft portion of the low head bolt 16A-1 is tightened with a nut outside the oil ring guide 15a. Further, the protrusion 16a-2 is formed by screwing the low head bolt 16A-2 into the end face of the upper bearing metal 12, and arranging the head (that is, the protrusion 16a-2) in the above-described space.

  The oil ring 14a is disposed between the projecting portion 16a-1 and the projecting portion 16a-2 while the shaft 11 is rotating and stopped, and the projecting portion 16a-1 and the projecting portion 16a-2 The space between the oil ring 14a and the oil ring guide 15a and the space between the oil ring 14a and the end surface of the upper bearing metal 12 are respectively defined, and a space is formed on the side surface of the oil ring 14a. As a result, contact between the oil ring 14a and the oil ring guide 15a and contact between the oil ring 14a and the end face of the upper bearing metal 12 are avoided. That is, the oil ring 14a comes into contact with only the protrusion 16a-1 and the protrusion 16a-2 during rotation. Thereby, the contact area of the oil ring 14a and the oil ring guide 15a is reduced. Reducing the contact area reduces the resistance due to contact during rotation of the oil ring, and has the effect of smoothly rotating the oil ring 14a and the oil ring 14b without impeding the rotation of the oil ring 14a.

  The same applies to the oil ring 14b and the oil ring guide 15b.

  As shown in FIG. 6, in addition to the low head bolt 16A-1, the oil ring guide 15a is provided with a low head bolt 16C-1. A low head bolt similar to the low head bolt 16A-2 is provided on the end surface of the upper bearing metal 12 so as to face the low head bolt 16C-1. Thus, by supporting the oil ring 14a with two low head bolts in the circumferential direction, the oil ring 14a is prevented from swinging in the axial direction in the space described above, and the behavior of the oil ring 14a during rotation is prevented. Stabilize. Depending on the operating conditions such as the shape of the protrusions, the rotation speed of the shaft 11, the temperature of the oil and the outside air, etc., the oil ring 14a may be prevented from swaying only at one place, but not limited to two places. In some cases, it may be preferable to support the oil ring 14a at a plurality of locations such as locations and four locations. The same applies to the oil ring 14b.

(Specific configuration of the first space 201 and the second space 202)
8 and 9 are explanatory diagrams for explaining the first space 201 and the second space 202 described above. FIG. 8 is an external view of the oil ring 14 a and the oil ring guide 15 a as viewed from the axial direction of the shaft 11. FIG. 9 is an enlarged view of the oil ring type plain bearing 1 according to the present embodiment, (a) to (d) are explanatory views for explaining the first space 201, and (e) is the first space. It is explanatory drawing explaining the 201st-4th space 204. FIG.

  The first space 201 is a space formed by the first member 151 and the upper surface of the oil ring 14a facing each other. As shown in FIG. 8, there is a first space 201 above the oil ring 14 a near the top of the oil ring 14 a that is in contact with the upper portion of the shaft 11.

  The first space 201 gradually narrows along the rotation direction of the oil ring 14a, and there is a portion that becomes the narrowest. When passing through the narrowest portion, the distance between the upper surface of the oil ring 14a and the first member 151 is increased again.

  The first space 201 exists from the upstream side to the downstream side in the rotational direction of the top of the oil ring 14a. The oil dammed up in the first space 201 overflows mainly from the downstream side in the rotation direction when viewed from the top of the oil ring 14a in the first space 201, but the characteristics such as the viscosity of the oil and the rotation of the oil ring 14a Depending on the speed, the oil ring 14a may overflow from the upstream side as viewed from the top.

  The second space 202 includes a space formed by the end surfaces of the second member 152 and the upper bearing metal 12 and the side surface of the oil ring 14a facing each other. The second space 202 is connected to the first space 201 and overflows with a space from which oil overflows. It consists of a space where the extracted oil is supplied to the bearing metal. That is, the second space 202 includes a third space 203 and a fourth space 204 as shown in FIG.

  In the above-described embodiment, the form in which the first space 201 is a gradually decreasing space has been described. However, as shown in FIG. 10, the second space 202 (part (the third space 203)) is the same as the first space 201. You may arrange | position the 2nd member 152 so that it may become narrow gradually in the rotation direction downstream with respect to the side surface of the oil ring 14a so that it may become narrow gradually along the rotation direction of the oil ring 14a. When the oil attached to the side surface of the oil ring 14a starts to pass through the second space 202 due to the rotation of the oil ring 14a, the oil starts from the narrowest part of the second space 202 that gradually narrows along the rotation direction. As a dam. In this way, the oil attached to the side surface of the oil ring 14a remains attached to the oil ring 14a and is returned to the oil tank 22 again unless an external force such as damming is applied. Part). Similar to the first space 201, a gradually decreasing space can be formed by the second space 202, and the oil returned to the oil tank 22 can be supplied to the lower bearing metal 13.

  The second space 202 is formed from a third space 203 and a fourth space 204. The third space 203 is a space formed by the side surface of the oil ring 14 a and the oil ring guide 15 a in the second space 202. The oil leaking from the first space 201 closes the passage in the circumferential direction and falls downward from the axial direction. The third space 203 is positioned in such a direction that oil leaks from the first space 201, and most of the oil leaking from the first space 201 is guided to the fourth space 204 through the third space 203. Is done. The second member 152 also contributes greatly to the guidance from the third space 203 to the fourth space 204.

  The fourth space 204 is a space connecting the third space 203 and the lower bearing metal 13 (the lower bearing metal end portion 13a thereof). The oil overflowing from the first space 201 to the third space 203 is supplied to the lower bearing metal end portion 13a via the fourth space 204.

  Note that the distance (the distance between the oil ring 14a and the oil ring guide 15a, the distance between the oil ring 14a and the end surface of the upper bearing metal 12) in the axial direction of the shaft 11 of the third space 203 is as shown in FIG. In addition, the oil ring 14a is positioned in the axial direction by the protrusion 16a-1 and the protrusion 16a-2, respectively.

(Specific configuration of oil ring guide 15a and oil ring guide 15b)
Next, the oil ring guide 15a will be described with reference to FIGS. As shown in FIG. 7, the oil ring guide 15a and the oil ring guide 15b are respectively provided on the end surfaces of the upper bearing metal 12 facing each other, so that their shapes are symmetrical with each other. It becomes a relationship. Therefore, in the following description regarding the oil ring guide 15a and the oil ring guide 15b, only the oil ring guide 15a will be described using each drawing, and description of the oil ring guide 15b will not be repeated.

  FIG. 12 is a perspective view of the oil ring guide 15a. As shown in FIG. 12, the oil ring guide 15a includes a first member 151, a second member 152, a third member 153, a fourth member 154, and a fifth member 155.

  The first member 151 is opposed to the upper surface of the oil ring 14a, the third member 153 is opposed to the inner surface (inner peripheral surface) of the oil ring 14a, and the second member 152 and the fourth member 154 are respectively oil ring 14a. The oil ring guide 15 a is attached to the end surface of the upper bearing metal 12 so as to face the side surface of the upper bearing metal 12. The oil ring guide 15a is fixed to the end surface of the upper bearing metal 12 with the fifth member 155 using bolts or the like. The second member 152 has a bolt hole 156 and a bolt hole 157 for passing the low head bolt 16A-1 and the like.

  13 and 14 are enlarged views of the shaft 11, bearing metal (upper bearing metal 12, lower bearing metal 13), and oil ring 14a. In FIG. 13 and FIG. 14, illustration of the other constituent members of the oil ring type plain bearing 1 before the two-dot chain line portion is omitted for easy viewing of the drawings. As shown in FIGS. 13 and 14, the shaft 11 is rotationally driven by a motor or the like in the direction of the arrow, and the oil ring 14 a rotates in the same arrow direction as the shaft 11 as the shaft 11 is rotationally driven.

  The first member 151 is arranged to face the upper surface of the oil ring 14a, and forms a first space 201 between the upper surface of the oil ring 14a. The first space 201 has a narrowest portion on the downstream side in the rotation direction, and forms a gradually decreasing space.

  As the shaft 11 rotates, the oil ring 14a rotates, and the oil accumulated in the oil tank 22 adheres to the oil ring 14a, and is scraped up above the shaft 11 as the oil ring 14a rotates.

  The oil attached to the oil ring 14a in this manner is returned to the oil tank 22 below the lower bearing metal 13 again without being attached to the oil ring 14a unless an external force such as damming is applied. Oil. The oil dammed up at the narrowest part of the first space 201 gradually overflows from the first space 201. In other words, the oil that has been attached to the oil ring and has been returned to the oil tank 22 is supplied to the lower bearing metal 13 from the second space 202 including the side surface of the oil ring 14a by being dammed. be able to.

  In the present embodiment, the second member 152 is manufactured and assembled in accordance with the shaft shape, and the distance is kept to such an extent that a slight clearance (about several mm) is left in the radial direction. By doing so, the oil that is about to overflow in the axial direction is blocked by the second member 152 except for a clearance portion of several mm, so that the amount of oil supplied to the sliding contact surface between the shaft 11 and the bearing metal is reduced. To increase.

  The third member 153 extends from the second member 152 in the axial direction of the oil ring 14a so as to face the inner surface of the oil ring 14a, and allows oil that has overflowed from the first space 201 to the second space 202. Guide to the lower bearing metal 13. The oil scooped up by the oil ring 14a has a tangential force of the oil ring 14a due to the centrifugal force caused by the rotation of the oil ring 14a that rotates around the shaft 11, and therefore is downward as viewed from the top of the oil ring. Some are not supplied to the lower bearing metal 13 but are scattered to the oil tank 22 and return to the oil tank 22 again. The third member 153 is vertically disposed above the oil receiving port 301 (see FIG. 15) (directly above in the present embodiment). As a result, the oil that jumps out from the third space 203 in a direction perpendicular to the rotation direction inward and a tangential velocity component in the rotation direction of the oil ring 14 a hits the third member 153 in the fourth space 204, thereby increasing the tangential velocity. Loss and the passage in the circumferential direction is blocked and there is only an escape route to fall downward, so that it is easily guided to the oil receiving port 301 in the lower bearing metal 13 directly below the fourth space 204.

  The fourth member 154 faces the side surface of the oil ring 14a. The fourth member 154 is located on the upstream side in the rotational direction as a member of the oil ring guide 15a. The oil that adheres to the oil ring 14a and goes from the bottom to the top may fall off the oil ring 14a before entering the first space 201. In this case, the oil that peels off from the oil ring 14a returns to the oil tank 22 as it is due to gravity and is not utilized as lubricating oil. Therefore, the fourth member 154 has a shape that warps outward in the direction opposite to the side facing the oil ring 14a, and makes it easy to guide oil to the first space 201 by providing a wide inlet.

(Specific configuration of lower bearing metal 13)
FIG. 15 is a perspective view of the upper bearing metal 12 and the lower bearing metal 13.

  The lower bearing metal 13 includes a lower bearing metal end portion 13a, a lower bearing metal end portion 13b, and a lower bearing metal center portion 13c. The lower bearing metal end portion 13a is disposed at a position where the oil ring 14a is suspended from the shaft 11, and the lower bearing metal end portion 13b is disposed at a position where the oil ring 14b is suspended from the shaft 11. Further, the lower bearing metal central portion 13 c is disposed so as to face the upper bearing metal 12. In the present embodiment, the lower bearing metal end portion 13a, the lower bearing metal end portion 13b, and the lower bearing metal center portion 13c will be described as being integrally formed of the same member.

  An oil receiving port 301 is provided in the lower bearing metal end 13b. The oil receiving port 301 receives the oil overflowing from the first space 201 guided through the second space 202 (the third space 203 and the fourth space 204).

  The oil receiving port 301 is formed on the upper surface of the lower bearing metal end 13b on the downstream side in the rotational direction when viewed from the top of the shaft 11. The oil receiving port 301 communicates with the first oil supply path 303 formed on the sliding contact surface of the lower bearing metal central portion 13 c with the shaft 11 via the rotation direction path 302. The oil received by the oil receiving port 301 flows through the rotation direction path 302 and flows into the first oil supply path 303 as the shaft 11 rotates. The oil that has flowed into the first oil supply path 303 reaches the sliding contact surface with the shaft 11.

  The oil receiving port 301 is connected to an axial path 304 represented by a hidden line (broken line). If the upper bearing metal 12 and the lower bearing metal central portion 13c are integrally formed of the same member, the axial path 304 is formed so as to penetrate the members constituting the bearing metal at the time of the integral molding. It is a route. Further, if the upper bearing metal 12 and the lower bearing metal central portion 13c are formed separately from different members, for example, the contact surface of the lower bearing metal central portion 13c with the upper bearing metal 12 in the axial direction What is necessary is just to process the groove | channel used as the path | route 304. FIG. The oil received by the oil receiving port 301 flows into the second oil supply path 305 via the axial path 304. The oil that has flowed into the second oil supply path 305 flows into the first oil supply path 303 and reaches the sliding contact surface of the bearing metal with the shaft 11 as described above.

  The oil ring 14b is suspended above the lower bearing metal end portion 13b, so that the oil scraped up by the oil ring 14b is supplied to the sliding contact surface between the shaft 11 and the bearing metal through the lower bearing metal end portion 13b. In addition, since the lower bearing metal end portion 13b and the lower bearing metal center portion 13c are integrally formed, there is no step between the sliding contact surface, and the shaft 11 and the bearing metal can be slid smoothly. Can be supplied to the surface.

  The same applies to the lower bearing metal end 13a.

  Here, in the conventional bearing device in which the groove for housing the oil ring is provided in the upper bearing metal, it is necessary to process the upper bearing metal in order to provide the groove in the upper bearing metal. During this processing, there is a problem that distortion or the like occurs in the upper bearing metal, and as a result, the cylindricity of the upper bearing metal decreases. Further, the machining of the upper bearing metal requires a lot of cost and labor.

  On the other hand, in the case of the oil ring type slide bearing 1 in which the oil ring is arranged on the end face of the bearing metal, the oil ring 14a and the oil ring 14b are attached to each end face of the upper bearing metal 12 (that is, the shaft of the shaft 11). Accordingly, it is not necessary to provide a groove in the upper bearing metal 12. For this reason, the groove processing of the upper bearing metal 12 as described above is not necessary, and as a result, the cylindricity of the upper bearing metal 12 is not reduced due to distortion of the upper bearing metal 12 and the cylindricity is easily increased. The bearing metal which can be ensured can be manufactured.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  For example, in Embodiment 2 described above, the oil ring 14a and the oil ring 14b are suspended on the outside of the bearing metal. However, in order to increase the amount of oil supplied to the bearing metal, the oil ring is further stored in the upper bearing metal. You may employ | adopt the aspect which provides the groove | channel to do. Further, when the number of oil rings is increased, the amount of oil supplied to the bearing metal is increased. Therefore, the use of the oil ring is not limited to the two in the above-described embodiment, and when the amount of oil supply is small, there may be a case where one shaft may be suspended, or a groove for housing the oil ring is formed in the bearing metal. Alternatively, two or more may be suspended side by side on the outside of the bearing metal and suspended three or more.

  For example, as shown in FIG. 11, the low head bolt 16A-1 is passed through the bolt hole of the oil ring guide 15a, and the protrusion 16a-1 as the head is disposed in the space. Instead of such a protrusion 16a-1, as shown in FIG. 16, the oil ring guide 15a made of a thin metal such as a steel plate, a stainless steel plate, an aluminum plate, or the like is punched by a press machine. 17 may be provided. Further, the protruding portion may be provided by cutting and raising by laser processing or the like. Of course, the oil ring guide 15a may be formed of resin instead of the thin metal plate as described above.

  Further, the lower bearing metal end portion 13a, the lower bearing metal end portion 13b, and the lower bearing metal center portion 13c may be formed separately from different members. When each is formed separately, for example, the lower bearing metal end portion 13a and the lower bearing metal end portion 13b are respectively set screws in screw holes provided in the respective end surfaces of the lower bearing metal central portion 13c. May be fixed to each end surface by screwing or the like. Moreover, when each is shape | molded separately, you may integrally mold the lower bearing metal center part 13c and the upper bearing metal 12 with the same member. In short, the lower bearing metal end portion 13a and the lower bearing metal end portion 13b may extend along the axial direction of the shaft 11 up to a position where the oil ring 14a and the oil ring 14b are suspended from the shaft 11.

  Further, the lower bearing metal end portion 13b is adapted to the shape of the lower bearing metal central portion 13c, but is not limited thereto. For example, in FIG. 15, the lower bearing metal end 13 b is a semicircle, but it may be a quarter arc or the like. However, even in such a case, the end 306 of the lower bearing metal end 13b rotates more than the first oil supply path 303 in order to prevent oil from leaking out of the bearing metal beyond the lower bearing metal end 13b. It is preferable to be located upstream in the direction. The same applies to the lower bearing metal end 13a.

  Finally, in Embodiments 1 and 2 described above, it has been described that the gradually decreasing space is formed using an oil ring guide. However, instead of the oil ring guide, a part of the housing and the bearing metal may be used. In addition, a space that functions in the same manner may be formed by air called an air wall.

  The present invention can be used for an oil ring type plain bearing.

DESCRIPTION OF SYMBOLS 1 Oil ring type plain bearing 11 Shaft 12 Upper bearing metal 13 Lower bearing metal 13a Lower bearing metal edge part 13b Lower bearing metal edge part 13c Lower bearing metal center part 14a Oil ring 14b Oil ring 15a Oil ring guide 15b Oil ring guide 16 Low head Bolt 16a-1 Protrusion 16a-2 Protrusion 17 Protrusion 21 Bearing housing 21a Housing 21b Bearing holder 22 Oil tank 51 First member 52 Second member 151 First member 152 Second member 153 Third member 154 Fourth member 155 Fifth member 156 Bolt hole 157 Bolt hole 201 First space 202 Second space 203 Third space 204 Fourth space 301 Oil receiving port 302 Rotational direction path 303 First oil supply path 304 Axial path 305 Second oil supply path 306 Termination

Claims (6)

The axis,
A bearing metal that supports the shaft;
An oil ring suspended on the shaft and scooping up the oil below the shaft by rotating the shaft;
A taper space including the outer surface of the oil ring,
The gradually decreasing space is gradually narrowed along the rotation direction of the oil ring, and is the narrowest at the upper half of the shaft and on the downstream side in the rotation direction when viewed from the top of the oil ring. Oil ring type plain bearing.   The oil ring type plain bearing according to claim 1, wherein the gradually decreasing space is a space including at least an upper surface of the oil ring.   The oil ring type plain bearing according to claim 1, wherein the gradually decreasing space is a space including at least a side surface of the oil ring. A first space including the upper surface of the oil ring;
The oil ring type plain bearing according to any one of claims 1 to 3, further comprising: a second space that is connected to the first space and guides the oil that overflows from the gradually decreasing space to the bearing metal.   The bearing metal has an oil receiving port through which oil is guided through the second space, and the oil in the oil receiving port is supplied to a sliding contact surface between the shaft and the bearing metal. The oil ring type plain bearing according to claim 4. A positioning portion for determining the position of the oil ring in the axial direction;
The positioning portion has a facing portion that faces the outer surface of the oil ring, and the facing portion is arranged so that a distance from the outer surface of the oil ring is reduced along a rotation direction of the oil ring. The oil ring type plain bearing according to any one of claims 1 to 5.

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