JP6548935B2 - Oil ring type slide bearing - Google Patents

Description

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

  Conventionally, oil ring type bearing devices are known. Each of the bearings comprises an upper bearing metal and a lower bearing metal each having a substantially semi-cylindrical shape, and constitutes a single cylinder by integrally fixing the both. A groove for accommodating the oil ring is provided at the central portion of the upper bearing metal, and the oil ring is suspended on the shaft in a state in which the oil ring is rotatably accommodated in the groove. The lower part of the oil ring is immersed in the oil stored under the lower bearing metal, and when the shaft rotates, the oil ring suspended on the shaft rotates following the shaft and scrapes the oil. This operation lubricates the bearing metal with oil.

  Since such an oil ring type lubrication method has a simple structure, it has the merit of being lower in cost as compared with a forced lubrication type lubrication method or the like in which an oil pump is separately provided to supply oil, but which can be supplied There is also a disadvantage that the amount is small.

  For this reason, as a prior art, in order to scrape off the oil adhering to the oil ring and efficiently supply it to the bearing metal, a bearing device is proposed in which an oil amount adjustment device is attached at a position where it can contact with and release from the outer periphery of the oil ring (See Patent Document 1).

Japanese Utility Model Publication No. 61-146690 (released 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 should be adjusted to the oil ring, and the oil amount adjustment frame should be tightened and fixed to the fixed pipe with a bolt. The structure is complicated. Therefore, an oil ring type slide bearing is expected that can be supplied efficiently to the bearing metal by scraping off oil adhering to the oil ring without the structure becoming complicated.

  In view of the above-mentioned subject, the object of the present invention is to increase the amount of oil supplied to bearing metal, when adopting an oil ring type slide bearing.

  In order to solve the above problems, the oil ring type slide bearing according to the present invention is suspended on a shaft, a bearing metal for supporting the shaft, and the shaft, and is rotated by the rotation of the shaft. An oil ring for scraping up the oil below and a tapering space including the outer surface of the oil ring, the tapering space gradually narrowing along the rotation direction of the oil ring and at the upper half of the shaft Viewed from the top of the oil ring and the narrowest on the downstream side in the rotational direction.

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

  Then, when the oil adhering to the outer surface of the oil ring starts to pass through the tapering space, the oil is blocked in the tapering space which narrows gradually along the rotational direction. Due to this blocking, the oil overflows from the gradually decreasing space, and in the conventional case, the oil returned to the lower side of the bearing metal can be supplied again to the bearing metal while adhering to the oil ring. A sufficient amount of oil can be supplied even in the case of adopting a bearing.

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

  According to the above configuration, the oil adhering to the upper surface of the oil ring can be supplied to the bearing metal.

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

  According to the above configuration, the oil adhering to the side surface of the oil ring can be supplied to the bearing metal.

  It is preferable to provide a first space including the upper surface of the oil ring, and a second space that is connected to the first space and guides the oil flowing out of the gradually decreasing space to the bearing metal.

  According to the above configuration, the 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.

  The bearing metal preferably has an oil receiving port through which the oil is introduced through the second space, and the oil in the oil receiving port is preferably supplied to a sliding contact surface between the shaft and the bearing metal.

  According to the above configuration, since the oil receiving port for receiving the oil from the second space is provided, the oil can be reliably supplied to the sliding contact surface between the shaft and the bearing metal.

  The positioning unit further includes a positioning unit that determines the position of the oil ring in the axial direction, the positioning unit includes an opposing unit that faces the outer surface of the oil ring, and the opposing unit extends along the rotation direction of the oil ring. It is preferable to arrange so that a space | interval with the outer surface of the said oil ring may become narrow.

  ADVANTAGE OF THE INVENTION This invention is effective in the ability to increase the oil quantity supplied to the sliding contact surface of a shaft and bearing metal, when employ | adopting an oil ring type slide bearing.

It is the sectional view which looked at the oil ring type slide bearing concerning one embodiment of the present invention from the direction of an axis. Is _X 1 -X ₁ a sectional view taken along line of FIG. It is a perspective view of an oil ring guide of an oil ring type slide bearing concerning the above-mentioned embodiment. It is an enlarged view of the oil ring type slide bearing concerning the above-mentioned embodiment, (a)-(d) is an explanatory view explaining the 1st space, (e) explains the 1st-4th space FIG. It is another enlarged view of the oil ring type slide bearing which concerns on the said embodiment, (a)-(d) is explanatory drawing explaining a 2nd space, (e) is the 1st-4th space. It is an explanatory view explaining. It is the sectional view which looked at the oil ring type slide bearing concerning other embodiments of the present invention from the direction of an axis. It is _X 2 -X ₂ cross-sectional view taken along line of FIG. It is an explanatory view for explaining the 1st space and the 2nd space of the oil ring type slide bearing concerning the above-mentioned other embodiment. It is an enlarged view of the oil ring type slide bearing concerning the above-mentioned other embodiment, (a)-(d) is an explanatory view explaining the 1st space, (e) is the 1st-4th space It is an explanatory view explaining. It is another enlarged view of the oil ring type slide bearing which concerns on the said other embodiment, (a)-(d) is explanatory drawing explaining a 2nd space, (e) is the 1st-4th It is an explanatory view explaining space. It is an AA line arrow directional cross-sectional view of FIG. It is a perspective view of the oil ring guide of the oil ring type slide bearing concerning the above-mentioned other embodiment. It is an enlarged view of the axis | shaft of an oil ring type slide bearing which concerns on said other embodiment, a bearing metal, an oil ring, and an oil ring guide. It is an enlarged view of the axis | shaft of an oil ring type slide bearing which concerns on said other embodiment, a bearing metal, an oil ring, and an oil ring guide. It is a perspective view of the upper bearing metal and lower bearing metal of the oil ring type slide bearing concerning the said other embodiment. It is a modified example in the AA arrow arrow cross section of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same or similar parts will be denoted by the same or similar reference numerals, and those with the same or similar reference numerals in the drawings may be omitted from the description. Further, the dimensions, materials, shapes, relative arrangements, processing methods, and the like of the configuration described in the present embodiment are merely an example, and the scope of the present invention should not be interpreted limitedly by these. Furthermore, the drawings are schematic, and dimensional ratios and shapes 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 slide bearing 1 as viewed in the axial direction of a shaft 11. FIG. 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 slide bearing 1. As shown in FIG. 3, the oil ring guide 15 a is composed of a first member 51 and a second member 52. The oil ring guide 15a is attached to the end face 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 forms a space (hereinafter referred to as “first space”) 201 from the upstream side to the downstream side in the rotational direction of the top of the oil ring 14 a by facing the upper surface of the oil ring 14 a (see FIG. 4 (e)). The first space 201 has a narrowest portion in the rotational direction of the first member 51. Specifically, it is shown in FIG. As shown in (a), the first space 201 changes to the cross sections O-Y ₁ , O-Y ₂ , and O-Y ₃ in the rotational direction. The distance between the first member 51 and the upper surface of the oil ring 14a changes so as to gradually narrow to a ₁ shown in (b), a ₂ shown in (c), a ₃ shown in (d), a ₃ Furthermore, it becomes the narrowest forward in the rotational direction. The distance between the upper surface of the oil ring 14a and the first member 51 is increased again when passing the narrowest portion. That is, a gradually decreasing space in which the space gradually decreases from the upstream side to the downstream side in the rotational direction near the top of the oil ring 14a is formed.

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

  Hereinafter, an operation of retaining oil in the first space 201 and the second space 202 and guiding the oil to the sliding contact surface of the shaft 11 and the bearing metal will be described. As the shaft 11 rotates, the oil ring 14 a rotates with it, and the oil stored in the oil tank 22 adheres to the oil ring 14 a and is scraped up above the shaft 11. When the oil attached to the upper surface of the oil ring 14a starts to pass through the first space 201, the oil starts from the narrowest portion of the first space 201, which gradually narrows along the rotational direction. You can stop it. The dammed oil will gradually spill out of the first space 201. That is, conventionally, by stopping the oil returned to the inside of the oil tank 22 while adhering to the oil ring 14a, the scraped oil is not returned to the oil tank 22 as it is, from the side surface of the oil ring 14a to the lower part. The bearing metal 13 can be supplied.

  The oil retained in the first space 201 has a viscosity in the first space 201, a rotational speed of the oil ring 14a, and the like, and is viewed from the top of the oil ring 14a in the first space 201 from the downstream side in the rotational direction. It may overflow or may overflow from the upstream side in the rotational direction as viewed from the top of the oil ring 14a.

  The second space 202 is a space in which the end faces of the second member 52 and the upper bearing metal 12 face the side surface of the oil ring 14 a, oil overflows from the first space 201, and is supplied to the lower bearing metal 13. The second space 202 comprises 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 such a direction in which the oil leaks from the first space 201, and most of the oil leaking from the first space 201 passes through the third space 203 and is made by the second member 52. It is guided to the fourth space 204.

  The fourth space 204 is a space connecting 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.

  As described above, according to the oil ring type slide bearing 1 according to the present embodiment, when the oil attached to the oil ring 14a starts to pass through the first space 201 by the rotation of the oil ring 14a, the oil has a rotational direction Starting from the narrowest portion of the first space 201 which narrows gradually along the length of the first space 201, and overflows from the first space 201 to the second space 202. Therefore, in the conventional case, the oil returned to the inside of the oil tank 22 can be supplied from the side surface of the oil ring 14a to the lower bearing metal 13 again while adhering to the oil ring 14a.

In the above-described embodiment, the first space 201 is the gradually decreasing space, but like the first space 201, a part of the second space 202 (third space 203) is along the rotation direction of the oil ring 14a. The space may be gradually reduced. Specifically, it is shown in FIG. Second space 202, as (a), in the rotating direction, changes in cross section _{O-Z 1, O-Z} 2, O-Z 3. The distance between the second member 52 and the side surface of the oil ring 14a changes as b ₁ shown in (b), b ₂ shown in (c), b ₃ shown in (d), and becomes 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 narrowed 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 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 narrows the narrowest portion of the second space 202, which gradually narrows along the rotational direction. It can be stopped as a starting point. Similar to the first space 201, the second space 202 can also supply such an oil to the lower bearing metal 13.

  In the above-mentioned embodiment, although the tapering space which narrows the 1st space 201 or the 2nd space 202 gradually was explained, as above-mentioned, both the 1st space 201 and the 2nd space 202 of oil ring 14a You may make it become narrow gradually along the rotation direction.

  Further, in the second space 202, only one of the distance between the side surface of the second member 52 and the side surface of the oil ring 14a or 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 referred to as "the outer surface".

Second Embodiment
Next, a second embodiment of the present invention will be described. Note that, in the present embodiment and the first embodiment, the corresponding parts are given the same reference numerals.

(Schematic configuration of oil ring type slide bearing 1)
FIG.6 and FIG.7 is a figure which shows schematic structure of the oil ring type slide bearing 1 which concerns on Embodiment 2 of this 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 slide 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. . As shown in FIGS. 6 and 7, the oil ring type slide bearing 1 is housed in a housing 21a. The housing 21a is provided with a through hole penetrating in the axial direction of the shaft 11, and the oil ring type slide bearing 1 is held by the 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 surrounding 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 form a single cylindrical bearing metal by being integrally fixed with a bolt via the opposing joint surfaces. On the sliding contact surfaces of the upper bearing metal 12 and the lower bearing metal 13 with the shaft 11, a metal layer made of a metal material such as white metal is formed. The metal layers of the upper bearing metal 12 and the lower bearing metal 13 rotatably support the shaft 11.

  The oil ring 14 a and the oil ring 14 b are rotatably suspended on the shaft 11. Lower portions of the oil ring 14a and the oil ring 14b are immersed in the oil in the oil tank 22 as shown in FIG. As the shaft 11 rotates, the oil ring 14 a and the oil ring 14 b rotate together, 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 for determining the positions of the oil ring 14a and the oil ring 14b suspended on the shaft 11 in the axial direction of the shaft 11, respectively. This 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 end faces of the upper bearing metal 12 by screwing them into screw holes provided on the end faces of the upper bearing metal 12, respectively, and the oil ring 14a and the oil ring 14b Store. The oil ring guide 15a and the oil ring guide 15b are manufactured, for example, by sheet metal processing or the like.

  The oil ring guide 15 a and the oil ring guide 15 b respectively form a space for housing the oil ring 14 a and the oil ring 14 b between the end faces of the upper bearing metal 12. In the oil ring type 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 and the oil ring guide 15a and the oil ring guide 15b The oil ring 14a and the oil ring 14b are accommodated in the space to be filled.

  As shown in FIG. 11, the oil ring guide 15a is provided with a projection 16a-1 projecting toward the inside of the above-mentioned space. Similarly, the end face of the upper bearing metal 12 is also provided with a projection 16a-2 projecting toward the inside of the above-described space. For example, the projection 16a-1 is obtained by inserting the low head bolt 16A-1 through the bolt hole of the oil ring guide 15a and arranging its head (that is, the projection 16a-1) in the space. The shaft portion of the low head bolt 16A-1 is tightened with a nut outside the oil ring guide 15a. The projection 16a-2 is formed by screwing a low head bolt 16A-2 to the end face of the upper bearing metal 12 and arranging its head (that is, the projection 16a-2) in the above-mentioned space.

  The oil ring 14a is disposed between the projection 16a-1 and the projection 16a-2 while the shaft 11 is rotating or at rest, and the projection 16a-1 and the projection 16a-2 make it possible to position the oil ring 14a. The distance between the oil ring 14a and the oil ring guide 15a and the distance between the oil ring 14a and the end face of the upper bearing metal 12 are respectively defined, and a space is formed on the side surface of the oil ring 14a. Thereby, the contact between the oil ring 14a and the oil ring guide 15a and the 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 in contact with only the protrusion 16a-1 and the protrusion 16a-2 during rotation. Thereby, the contact area of oil ring 14a and oil ring guide 15a is reduced. The reduction of the contact area reduces the resistance due to the contact during rotation of the oil ring, and has the effect that the oil ring 14a and the oil ring 14b rotate more smoothly without blocking the rotation of the oil ring 14a.

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

  In addition to the low head bolt 16A-1 described above, a low head bolt 16C-1 is provided on the oil ring guide 15a as shown in FIG. A low head bolt similar to the low head bolt 16A-2 is provided on the end face of the upper bearing metal 12 so as to face the low head bolt 16C-1. As described above, by supporting the oil ring 14a in the circumferential direction with two low-head bolts, the oil ring 14a is prevented from swinging in the axial direction in the above-described space, and the behavior of the oil ring 14a is rotating. Stabilize. Depending on the operating conditions, such as the shape of the projection, the rotational speed of the shaft 11, the temperature of oil and outside air, etc., it may be possible to prevent the swinging motion of the oil ring 14a at only one location. In some cases, it may be preferable to support the oil ring 14a at a plurality of places, such as four places. 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 describing 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 in the axial direction of the shaft 11. FIG. 9 is an enlarged view of the oil ring type slide bearing 1 according to the present embodiment, (a) to (d) are explanatory views for explaining the first space 201, and (e) is a first space It is an explanatory view explaining 201-the 4th space 204. As shown in 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, above the oil ring 14 a near the top of the oil ring 14 a in contact with the upper portion of the shaft 11, there is a first space 201.

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

  The first space 201 is present from the upstream side to the downstream side in the rotational direction of the top portion of the oil ring 14a. The oil stagnated in the first space 201 mainly overflows from the downstream side in the rotational direction as viewed from the top of the oil ring 14a in the first space 201, but characteristics such as the viscosity of the oil and the rotation of the oil ring 14a Depending on the speed, etc., it may also overflow from the upstream side in the rotational direction as viewed from the top of the oil ring 14a.

  The second space 202 includes a space formed by the end faces of the second member 152 and the upper bearing metal 12 facing the side surface of the oil ring 14a, and is connected to the first space 201 and overflows with a space where oil spills out. It consists of the space where the oil which has been discharged is supplied to the bearing metal. That is, as shown in FIG. 8, the second space 202 includes the third space 203 and the fourth space 204.

  Although the above-mentioned embodiment explained the form which the 1st space 201 turns into a gradually decreasing space, as shown in Drawing 10 (a part (3rd space 203)) of the 2nd space 202 like 1st space 201 The second member 152 may be disposed so as to gradually narrow on the downstream side in the rotational direction with respect to the side surface of the oil ring 14a so as to gradually narrow in the rotational 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 which gradually narrows along the rotational direction. It is stopped as. In this manner, the oil adhering to the side surface of the oil ring 14a is again returned to the inside of the oil tank 22 while adhering to the oil ring 14a, unless an external force such as blocking is exerted. Department). Similar to the first space 201, the second space 202 also forms a gradually decreasing space, and the oil returned to the oil tank 22 can be supplied to the lower bearing metal 13.

  The second space 202 is formed of 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 blocks the passage in the circumferential direction and falls downward from the axial direction. The third space 203 is located in such a direction in which the 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. Be done. The second member 152 also largely contributes 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 end 13 a of) 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 end 13a via the fourth space 204.

  The distance between the oil ring 14a and the oil ring guide 15a and the distance between the oil ring 14a and the end face of the upper bearing metal 12 in the axial direction of the shaft 11 in the third space 203 is as shown in FIG. The oil ring 14a is defined in the axial direction by the projection 16a-1 and the projection 16a-2, respectively.

(Specific configuration of oil ring guide 15a and oil ring guide 15b)
Next, the oil ring guide 15a will be described using FIG. 12, FIG. 13 and FIG. As shown in FIG. 7, since the oil ring guide 15a and the oil ring guide 15b are provided on the end faces of the upper bearing metal 12 facing each other, therefore, their shapes are plane-symmetrical to each other. It becomes a relationship. Therefore, in the following description of the oil ring guide 15a and the oil ring guide 15b, only the oil ring guide 15a will be described using the respective drawings, and the 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 15 a 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 faces the upper surface of the oil ring 14a, the third member 153 faces the inner surface (inner peripheral surface) of the oil ring 14a, and the second member 152 and the fourth member 154 respectively receive the oil ring 14a. The oil ring guide 15 a is attached to the end face 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 face of the upper bearing metal 12 by using a bolt or the like for the fifth member 155. Further, in the second member 152, a bolt hole 156 and a bolt hole 157 for passing the low head bolt 16A-1 and the like are opened.

  13 and 14 are enlarged views of the shaft 11, the bearing metal (upper bearing metal 12, lower bearing metal 13) and the oil ring 14a. In addition, in FIG.13 and FIG.14, illustration is abbreviate | omitted about the other structural member of the oil ring type slide bearing 1 earlier than the dashed-two dotted line part in order to be easy to read drawing. 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 disposed to face the upper surface of the oil ring 14a, and forms a first space 201 with the upper surface of the oil ring 14a. The first space 201 has a narrowest portion at the downstream side in the rotation direction, and forms a gradually decreasing space.

  The oil ring 14a rotates with the rotation of the shaft 11, and the oil stored 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 adhering to the oil ring 14a in this manner is returned to the oil tank 22 below the lower bearing metal 13 again while adhering to the oil ring 14a, unless an external force such as blocking is exerted. Oil. The oil blocked in the narrowest portion of the first space 201 will gradually spill out of the first space 201. That is, by being blocked, the oil that has been returned to the oil tank 22 is supplied again to the lower bearing metal 13 from the second space 202 including the side surface of the oil ring 14a, while adhering to the oil ring conventionally. be able to.

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

  The third member 153 is extended in the axial direction of the oil ring 14a from the second member 152 so as to face the inner surface of the oil ring 14a, and the oil overflowing from the first space 201 to the second space 202 is Guide the lower bearing metal 13. The oil scraped 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 moving along the shaft 11, so the oil is viewed downward from the top of the oil ring Some are not supplied to the lower bearing metal 13 and scatter into the oil tank 22 and return to the inside of the oil tank 22 again. The third member 153 is vertically disposed on the upper portion (right above in the present embodiment) of the oil receiving port 301 (see FIG. 15). As a result, the oil that jumps out from the third space 203 at a right angle in the rotational direction and with a tangential velocity component in the rotational direction of the oil ring 14a strikes the third member 153 in the fourth space 204 to achieve tangential velocity. Since it loses and the passage in the circumferential direction is blocked and there is only an escape path which falls downward, it is easily guided to the oil receiving port 301 in the lower bearing metal 13 located immediately below through 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 adhering to the oil ring 14 a and going from the lower side to the upper side may fall off the oil ring 14 a before entering the first space 201. In that case, the oil which falls off from the oil ring 14a is returned to the oil tank 22 as it is by gravity and is not used as a lubricating oil. Therefore, the fourth member 154 has a shape curving outward in the direction opposite to the side facing the oil ring 14a, and the oil is easily guided 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 is composed of a lower bearing metal end 13a, a lower bearing metal end 13b, and a lower bearing metal central portion 13c. The lower bearing metal end 13a is disposed at a position where the oil ring 14a is suspended on the shaft 11, and the lower bearing metal end 13b is disposed at a position where the oil ring 14b is suspended on the shaft 11. The lower bearing metal central portion 13 c is disposed to face the upper bearing metal 12. 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 members in the present embodiment.

  An oil receiving port 301 is provided at the lower bearing metal end 13b. The oil receiving port 301 receives oil that has been induced and flows out of the first space 201 via 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 13 b on the downstream side in the rotational direction as 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 with the shaft 11 of the lower bearing metal central portion 13 c via the rotational direction path 302. The oil received by the oil receiving port 301 flows through the rotational 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 spreads on the sliding surface with the shaft 11.

  Further, the oil receiving port 301 is connected to an axial path 304 represented by a hidden line (broken line). When 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 member constituting the bearing metal during the integral molding. It is a route. Also, if the upper bearing metal 12 and the lower bearing metal central portion 13c are separately formed from different members, for example, the axial direction of the lower bearing metal central portion 13c on the contact surface with the upper bearing metal 12 The groove to be the path 304 may be processed. 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 as described above, spreads over the sliding surface of the bearing metal with the shaft 11.

  The oil ring 14b is suspended above the lower bearing metal end 13b to supply the oil scraped up by the oil ring 14b to the sliding contact surface between the shaft 11 and the bearing metal via the lower bearing metal end 13b. Since the lower bearing metal end portion 13b and the lower bearing metal central portion 13c are integrally formed, no step is generated between the sliding contact surface and the sliding contact between the shaft 11 and the bearing metal more smoothly. It 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. At the time of this processing, distortion or the like occurs in the upper bearing metal, and as a result, there is a problem that the cylindricity of the upper bearing metal decreases. In addition, 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 disposed at 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 (ie, the shaft of the shaft 11) Are disposed on the outside of the upper bearing metal 12 in the direction), which makes it unnecessary to provide the upper bearing metal 12 with a groove. For this reason, the groove processing of the upper bearing metal 12 as described above is not required, and as a result, the cylindricality of the upper bearing metal 12 does not decrease due to distortion of the upper bearing metal 12 or the like, and the cylindricality is easily Bearing metal that can be secured can be manufactured.

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

  For example, in the second embodiment 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 accommodated in the upper bearing metal. An embodiment may be adopted in which a groove is provided. Also, if the number of oil rings is increased, the amount of oil supplied to the bearing metal will increase. Therefore, the use of the oil ring is not limited to the two in the above-described embodiment, and in the case of a small amount of oil supply, a single suspension may be provided on the shaft 11 to form a groove for housing the oil ring in the bearing metal Alternatively, in some cases, two or more may be suspended side by side and suspended three or more on the outside of the bearing metal.

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

  The lower bearing metal end 13a, the lower bearing metal end 13b, and the lower bearing metal central portion 13c may be separately formed of different members. When each is separately formed, for example, the lower bearing metal end 13a and the lower bearing metal end 13b are respectively set screws in screw holes provided in respective end faces of the lower bearing metal central portion 13c. The screw may be fixed to each end face 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. The point is that the lower bearing metal end 13a and the lower bearing metal end 13b may extend along the axial direction of the shaft 11 to a position where the oil ring 14a and the oil ring 14b are suspended on the shaft 11.

  Furthermore, although the lower bearing metal end 13b is adapted to the shape of the lower bearing metal central portion 13c, it is not limited to this. For example, although the lower bearing metal end 13b is semicircular in FIG. 15, it may be a circular arc of about 1⁄4 or the like. However, even in such a case, the end 306 of the lower bearing metal end 13 b rotates more than the first oil supply path 303 in order to prevent oil from leaking beyond the lower bearing metal end 13 b and out of the bearing metal. It is preferable to be located upstream in the direction. The same applies to the lower bearing metal end 13a.

  Finally, in the above-described Embodiments 1 and 2, although the tapering space is described to be formed using the oil ring guide, it may be formed using a part of the housing and bearing metal instead of the oil ring guide. Alternatively, a space that functions similarly with air, such as an air wall, may be formed.

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

DESCRIPTION OF SYMBOLS 1 oil ring type slide bearing 11 axis 12 upper bearing metal 13 lower bearing metal 13a lower bearing metal end 13b lower bearing metal end 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 Projection 16a-2 Projection 17 Projection 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 End

Claims (5)

Axis,
A bearing metal for supporting the shaft;
An oil ring suspended on the shaft and scraping oil below the shaft by being rotated with the rotation of the shaft;
An oil ring guide disposed near the top of the oil ring;
It includes at least the upper surface of the oil ring , is surrounded by the inner surface of the oil ring guide and the end face of the bearing metal, and has a closed tapering space on the side,
The tapered space gradually narrows along the rotation direction of the oil ring, and is the narrowest in the upper half of the shaft and on the downstream side in the rotation direction as viewed from the top of the oil ring. Oil ring type sliding bearing. A first space including the upper surface of the oil ring;
The oil ring type slide bearing according to claim 1, further comprising: a second space connected to the first space and guiding oil flowing out of the gradually decreasing space to the bearing metal. Axis,
A bearing metal for supporting the shaft;
An oil ring suspended on the shaft and scraping oil below the shaft by being rotated with the rotation of the shaft;
Declined space including the outer surface of the above oil ring,
A first space including the upper surface of the oil ring;
A second space connected to the first space and guiding oil flowing out of the gradually decreasing space to the bearing metal;
The gradually decreasing space gradually narrows along the rotation direction of the oil ring, and is the narrowest on the upper half of the shaft and on the downstream side in the rotation direction as viewed from the top of the oil ring,
The bearing metal has an oil receiving port to which oil is introduced 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. Oil ring type sliding bearing. Axis,
A bearing metal for supporting the shaft;
An oil ring suspended on the shaft and scraping oil below the shaft by being rotated with the rotation of the shaft;
Declined space including the outer surface of the above oil ring,
A positioning unit that determines the position of the oil ring in the axial direction;
The gradually decreasing space gradually narrows along the rotation direction of the oil ring, and is the narrowest on the upper half of the shaft and on the downstream side in the rotation direction as viewed from the top of the oil ring,
The positioning portion has a facing portion facing the outer surface of the oil ring, and the facing portion is disposed so that the distance between the facing portion and the outer surface of the oil ring is narrow along the rotation direction of the oil ring. Oil ring type slide bearing characterized by   The oil ring type slide bearing according to claim 2 or 3, wherein the second space includes a third space which gradually narrows along the rotational direction.

Images