JP2018197589A - Crank washer - Google Patents

Abstract

To provide a crank washer for suppressing seizure without the need for an oil groove and surface machining.SOLUTION: A crank washer 30 for supporting the axial force of a crankshaft consists of an upper washer 31 and a lower washer 32. The upper washer 31 has an inclined face 313, and the lower washer 32 has an inclined face 323. The inclined face 313 has a prefixed radial width w in view from the axial direction. Besides the inclined face 313 has an axial thickness gradually reduced as extending from the side of an outer peripheral face 315 to the side of an inner peripheral face 314. The inclined face 323 has a prefixed radial width w in view from the axial direction. Besides, the inclined face 323 has a y-axial thickness gradually reduced as extending from the side of an outer peripheral face 325 to the side of an inner peripheral face 324. Lubricating oil flowing out of a main bearing flows from the inclined face 313 to a sliding face 310 and flows from the inclined face 323 to a sliding face 320.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a crank washer.

  As an invention for increasing the amount of lubricating oil retained on the surface of the thrust washer, there is a thrust washer disclosed in Patent Document 1, for example. This thrust washer has an oil groove along the vertical direction, and a herringbone-shaped texture formed by regular irregularities is provided on the outer side in the axial direction. This texture increases the amount of lubricating oil retained on the surface of the thrust washer and generates an oil film pressure. Therefore, contact between the thrust surface of the crankshaft and the thrust washer can be prevented, and seizure can be prevented.

Japanese Patent Laying-Open No. 2015-169293

  When the oil groove is provided in the thrust washer, the lubricating oil easily escapes from the inner peripheral side to the outer peripheral side through the oil groove. Moreover, although the texture provided in the thrust washer is formed by surface processing, it takes time and effort for the surface processing.

  An object of the present invention is to suppress seizure without requiring oil grooves or surface processing in a crank washer.

  The present invention is a semi-annular crank washer having a sliding surface that receives an axial force of a rotating shaft, and includes a first inclined surface formed between an inner peripheral surface and the sliding surface. Provide crank washers.

  In this invention, the structure provided in the whole circumferential direction may be sufficient as a said 1st inclined surface.

  Moreover, in this invention, the structure currently formed narrowly as the width | variety of the radial direction of the said 1st inclined surface goes to the rotation direction downstream from the rotation direction upstream of the said rotating shaft may be sufficient.

  In the present invention, the first inclined surface may be configured such that a radial width in a predetermined portion in the circumferential direction is narrower than a portion other than the predetermined portion.

  Further, in the present invention, the radial width of the first inclined surface may be configured to become narrower from the end in the circumferential direction toward the center.

  Moreover, in this invention, the structure from which the depth from the said sliding surface of the said 1st inclined surface is formed shallowly as it goes to the rotation direction downstream from the rotation direction upstream of the said rotating shaft may be sufficient. .

  Moreover, in this invention, the structure currently formed shallowly as the depth from the said sliding surface of the said 1st inclined surface goes to the center side from the end side of the circumferential direction may be sufficient.

  Moreover, in this invention, the structure provided with the 2nd inclined surface formed between the outer peripheral surface and the said sliding surface may be sufficient.

  According to the present invention, oil can be actively flowed into the sliding surface in the crank washer, and seizure can be suppressed.

The figure which illustrates the crankshaft 1 in an internal combustion engine. The front view and sectional drawing of the crank washer 30. FIG. The front view of 30A of crank washers which concern on a modification. The front view of the crank washer 30B which concerns on a modification. The front view of the crank washer 30C which concerns on a modification. The front view of crank washer 30D concerning a modification. The front view of the crank washer 30E which concerns on a modification. Sectional drawing of the crank washer 30E. The front view of the crank washer 30F which concerns on a modification. Sectional drawing of the upper washer which concerns on a modification.

[Embodiment]
FIG. 1 is a diagram illustrating a crankshaft 1 in an internal combustion engine. In the crankshaft 1 that is an example of a rotating shaft, a main bearing 10, a connecting rod bearing 20, and a crank washer 30 are used. The main bearing 10 is a bearing that is mounted on a housing (not shown) of a cylinder block (not shown), holds a journal of the crankshaft 1, and supports the crankshaft 1. The connecting rod bearing 20 is a bearing that is attached to the connecting rod 2 to hold the pin of the crankshaft 1 and supports the connecting rod 2. A crank washer 30, which is an example of a thrust washer according to the present invention, is a bearing that is used in combination with the main bearing 10 and supports the axial force of the crankshaft 1. The crank washer 30 also has a function of positioning the crankshaft 1 and the cylinder block in the axial direction.

  2A is a front view of the crank washer 30, and FIG. 2B is a cross-sectional view taken along line AA in FIG. In the drawing, directions are indicated by orthogonal x-axis, y-axis and z-axis, and the rotation direction of the crankshaft 1 is indicated by an arrow a. In the figure, among the symbols representing the coordinate system, the symbol drawn with two lines intersecting in the circle represents the arrow from the front side to the back of the page, and the symbol with the black circle drawn in the circle is , Represents an arrow heading forward from the back side of the page. In the coordinate system of the drawing, the direction along the x axis is referred to as the x axis direction. Of the x-axis directions, the direction in which the x component increases is referred to as + x direction, and the direction in which the x component decreases is referred to as -x direction. The y and z components are also defined as the y-axis direction, + y direction, -y direction, z-axis direction, + z direction, and -z direction according to the above definition.

  The crank washer 30 includes a semi-annular flat plate upper washer 31 and a semi-annular flat plate lower washer 32. The upper washer 31 and the lower washer 32 are an example of a crank washer according to the present invention. The crank washers 30 are a set of two, and the opposite surfaces of a sliding surface 310 and a sliding surface 320, which will be described later, face each other, and a housing (not shown) is sandwiched therebetween. Note that the crank washer 30 may include only the upper washer 31 without including the lower washer 32.

  The upper washer 31 has a sliding surface 310, a notch 312 and an inclined surface 313. The notch 312 may be provided with reduced thickness in the + x direction and −x direction, respectively, or may be provided with reduced thickness in the + y direction. The sliding surface 310 is a surface that slides with the crankshaft 1 and is a part that receives the thrust load and supports the crankshaft 1.

  The inclined surface 313 which is an example of the first inclined surface according to the present invention is an inclined surface formed on the inner peripheral surface 314 side of the end surface in the −y direction of the upper washer 31. When viewed in the + y direction, the inclined surface 313 has a predetermined width w in the radial direction. Further, the inclined surface 313 has a thickness in the y-axis direction that decreases from the outer peripheral surface 315 side toward the inner peripheral surface 314 side.

  The lower washer 32 has a detent 321, a sliding surface 320, a notch 322, and an inclined surface 323. The rotation stopper 321 is caught in a rotation prevention groove provided in a housing (not shown), and prevents the lower washer 32 from rotating with the rotation of the crankshaft 1. Further, the rotation of the upper washer 31 is also suppressed by the rotation of the lower washer 32 being restrained by the rotation stopper 321 being engaged with the rotation prevention groove of the housing. It should be noted that a “relief” for preventing interference with the rotation stop groove may be provided at the base of the rotation stop 321.

  The notch 322 may be provided with reduced thickness in the + x direction and −x direction, respectively, or may be provided with reduced thickness in the + y direction. The sliding surface 320 is a surface that slides with the crankshaft 1 and is a part that receives the thrust load and supports the crankshaft 1.

  The inclined surface 323 which is an example of the first inclined surface according to the present invention is an inclined surface formed on the inner peripheral surface 324 side of the end surface in the −y direction of the lower washer 32. When viewed in the + y direction, the inclined surface 323 has a predetermined width w in the radial direction. Further, the inclined surface 323 has a thickness in the y-axis direction that decreases from the outer peripheral surface 325 side toward the inner peripheral surface 324 side.

  As a manufacturing method of the upper washer 31 and the lower washer 32, a plurality of methods can be applied. For example, when the material of the upper washer 31 and the lower washer 32 is a metal, the upper washer 31 and the lower washer 32 are obtained by pressing or cutting a plate-shaped metal. In addition, when the raw material of the upper washer 31 and the lower washer 32 is a metal, the inclined surface 313 and the inclined surface 323 are formed by a die or cutting when performing press working. Further, when the material of the upper washer 31 and the lower washer 32 is resin, the upper washer 31 and the lower washer 32 are obtained by injection molding or compression molding. When the material of the upper washer 31 and the lower washer 32 is resin, the inclined surface 313 and the inclined surface 323 are formed by injection molding or compression molding.

  In a state where the crank washer 30 is attached to the crankshaft 1, the lubricating oil supplied to the inner peripheral surface side of the main bearing 10 flows out of the main bearing 10 and then flows to the inclined surface 313 and the inclined surface 323. Since the inclined surface 313 is provided over the entire circumferential direction of the upper washer 31 on the sliding surface 310 side, and the inclined surface 323 is provided over the entire circumferential direction of the lower washer 32, the lubricating oil is inclined. From the surface 313 and the inclined surface 323, the entire sliding surface 310 and the sliding surface 320 are supplied.

  When the crank washer is not provided with the inclined surface 313 and the inclined surface 323, and the oil groove is provided in the sliding surface 310 and the sliding surface 320, the lubricating oil easily escapes to the outer peripheral side of the crank washer through the oil groove. . On the other hand, in this embodiment, since the lubricating oil is supplied from the inclined surface 313 and the inclined surface 323 to the entire sliding surface 310 and the sliding surface 320, the oil groove is not provided with the inclined surface 313 and the inclined surface 323. The amount of lubricating oil supplied to the entire sliding surface 310 and the sliding surface 320 is increased as compared with the case where it is provided, and seizure can be further suppressed. Further, in the present embodiment, the lubricating oil can be supplied to the entire sliding surface 310 and the sliding surface 320 without performing the surface processing for retaining the lubricating oil on the sliding surface 310 and the sliding surface 320. The number of manufacturing steps and cost can be reduced as compared with the configuration in which surface processing is performed.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. For example, the present invention may be implemented by modifying the above-described embodiment as follows. In addition, you may combine each of embodiment mentioned above and the following modifications.

(Modification 1)
FIG. 3 is a front view of a crank washer 30A according to a modification of the present invention. The crank washer 30A includes a semi-annular flat plate upper washer 31A and a semi-annular flat plate lower washer 32A. The upper washer 31A has an inclined surface 313A instead of the inclined surface 313, and the lower washer 32A has an inclined surface 323A instead of the inclined surface 323. In the following description, the same configuration as that of the upper washer 31 in the upper washer 31A and the same configuration as that of the lower washer 32 in the lower washer 32A are denoted by the same reference numerals in the drawings, and description thereof will be omitted.

  The inclined surface 313A is an inclined surface formed on the inner peripheral surface 314 side of the end surface in the −y direction of the upper washer 31A. In the inclined surface 313A, the thickness in the y-axis direction decreases from the outer peripheral surface 315 side toward the inner peripheral surface 314 side. When the upper washer 31A is viewed in the + y direction, the radial width of the inclined surface 313A is narrowest at the central portion in the x-axis direction, and becomes wider from the central portion in the x-axis direction toward the mating surface along the circumferential direction. It has become.

  The inclined surface 323A is an inclined surface formed on the inner peripheral surface 324 side of the end surface in the −y direction of the lower washer 32A. In the inclined surface 323A, the thickness in the y-axis direction decreases from the outer peripheral surface 325 side toward the inner peripheral surface 324 side. When the lower washer 32A is viewed in the + y direction, the radial width of the inclined surface 323A is the narrowest at the central portion in the x-axis direction and becomes wider from the central portion in the x-axis direction toward the mating surface along the circumferential direction. It has become.

  In the vicinity of the mating surface of the upper washer 31A and the lower washer 32A, the amount of lubricating oil flowing out from the main bearing 10 is greater than that in the central portion in the x-axis direction. In this modified example, in the vicinity of the mating surface where the amount of lubricating oil flowing from the main bearing 10 is large, the width of the inclined surface 313A and the width of the inclined surface 323A are widened. 310 and sliding surface 320 can be supplied.

(Modification 2)
FIG. 4 is a front view of a crank washer 30B according to a modification of the present invention. The crank washer 30B includes a semi-annular flat plate upper washer 31B and a semi-annular flat plate lower washer 32B. The upper washer 31B has an inclined surface 313B instead of the inclined surface 313, and the lower washer 32B has an inclined surface 323B instead of the inclined surface 323. In the following description, the same configuration as that of the upper washer 31 in the upper washer 31B and the same configuration as that of the lower washer 32 in the lower washer 32B are denoted by the same reference numerals in the drawings, and description thereof will be omitted.

  The inclined surface 313B is an inclined surface formed on a part on the inner peripheral surface 314 side at the end surface in the −y direction of the upper washer 31B. In the embodiment, the inclined surface 313 is provided over the entire circumferential direction on the sliding surface 310 side, whereas the inclined surface 313B is formed in the circumferential direction from the mating surface upstream of the rotation direction of the crankshaft 1. It differs in that it is provided up to a position of a predetermined distance along the circumference and not provided over the entire circumferential direction. In the inclined surface 313B, the thickness in the y-axis direction decreases from the outer peripheral surface 315 side toward the inner peripheral surface 314 side. When the upper washer 31B is viewed in the + y direction, the radial width of the inclined surface 313B is wider on the mating surface side upstream of the crankshaft 1 in the rotational direction, and as it goes downstream in the rotational direction of the crankshaft 1 along the circumferential direction. It is narrower.

  The inclined surface 323B is an inclined surface formed in a part on the inner peripheral surface 324 side on the end surface in the −y direction of the lower washer 32B. In the embodiment, the inclined surface 323 is provided over the entire circumferential direction on the sliding surface 320 side, whereas the inclined surface 323B is arranged in the circumferential direction from the mating surface upstream of the rotation direction of the crankshaft 1. It differs in that it is provided up to a position of a predetermined distance along the circumference and not provided over the entire circumferential direction. In the inclined surface 323B, the thickness in the y-axis direction decreases from the outer peripheral surface 325 side toward the inner peripheral surface 324 side. When the lower washer 32B is viewed in the + y direction, the radial width of the inclined surface 323B is wider on the mating surface upstream of the crankshaft 1 in the rotational direction, and as it goes downstream in the rotational direction of the crankshaft 1 along the circumferential direction. It is narrower.

  Also in this modified example, in the vicinity of the mating surface where the amount of lubricating oil flowing from the main bearing 10 is large, the width of the inclined surface 313B and the width of the inclined surface 323B are widened. 310 and sliding surface 320 can be supplied.

(Modification 3)
FIG. 5 is a front view of a crank washer 30C according to a modification of the present invention. The crank washer 30C includes a semi-annular flat plate upper washer 31C and a semi-annular flat plate lower washer 32C. The upper washer 31C has an inclined surface 313C instead of the inclined surface 313, and the lower washer 32C has an inclined surface 323C instead of the inclined surface 323. In the following description, the same configuration as that of the upper washer 31 in the upper washer 31C and the same configuration as that of the lower washer 32 in the lower washer 32C are denoted by the same reference numerals in the drawings, and description thereof will be omitted.

  The inclined surface 313C is an inclined surface formed on the inner peripheral surface 314 side of the end surface in the −y direction of the upper washer 31C. In the inclined surface 313C, the thickness in the y-axis direction decreases from the outer peripheral surface 315 side toward the inner peripheral surface 314 side. When the upper washer 31A is viewed in the + y direction, the radial width of the inclined surface 313C is the widest in the central portion in the x-axis direction and narrows from the central portion in the x-axis direction toward the mating surface along the circumferential direction. It has become.

  The inclined surface 323C is an inclined surface formed on the inner peripheral surface 324 side of the end surface in the −y direction of the lower washer 32C. In the inclined surface 323C, the thickness in the y-axis direction decreases from the outer peripheral surface 325 side toward the inner peripheral surface 324 side. When the lower washer 32C is viewed in the + y direction, the radial width of the inclined surface 323C is the widest in the central portion in the x-axis direction and narrows from the central portion in the x-axis direction toward the mating surface along the circumferential direction. It has become.

  In the sliding surface 310 and the sliding surface 320, depending on the type of engine, the predetermined part of the crankshaft 1 in the rotation direction on the upstream side and the downstream side, that is, in the vicinity of the mating surface, is located on the thrust surface from other positions. It will be a strong hit. In this modification, since the width of the inclined surface 313C and the inclined surface 323C is narrow on the inner peripheral side of this portion, a sliding surface with respect to the thrust surface can be secured. In addition, since the width of the inclined surface 313C and the inclined surface 323C increases from the mating surface side toward the central portion in the x-axis direction along the circumferential direction, a large amount of lubricating oil is applied to the sliding surface 310 and the sliding surface. 320 can be supplied.

(Modification 4)
FIG. 6 is a front view of a crank washer 30D according to a modification of the present invention. The crank washer 30D includes a semi-annular flat plate upper washer 31D and a semi-annular flat plate lower washer 32D. The upper washer 31D has an inclined surface 313D-1 and an inclined surface 313D-2 instead of the inclined surface 313, and the lower washer 32D has an inclined surface 323D-1 and an inclined surface 323D-2 instead of the inclined surface 323. . In the following description, the same configuration as the upper washer 31 in the upper washer 31D and the same configuration as the lower washer 32 in the lower washer 32D are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

  The inclined surface 313D-1 and the inclined surface 313D-2 are inclined surfaces formed on a part of the end surface in the −y direction of the upper washer 31D on the inner peripheral surface 314 side. In the inclined surface 313D-1 and the inclined surface 313D-2, the thickness in the y-axis direction decreases from the outer peripheral surface 315 side toward the inner peripheral surface 314 side. When the upper washer 31D is viewed in the + y direction, the inclined surface 313D-1 is predetermined in the circumferential direction between the mating surface on the upstream side in the rotational direction of the crankshaft 1 and the central portion in the x-axis direction. It is provided in the range. The radial width of the inclined surface 313D-1 is the largest in the central portion of the inclined surface 313D-1 when viewed in the circumferential direction, and becomes narrower as the distance from the central portion increases in the circumferential direction. The inclined surface 313D-2 is provided in a predetermined range along the circumferential direction between the mating surface on the downstream side in the rotation direction of the crankshaft 1 and the central portion in the x-axis direction. The radial width of the inclined surface 313D-2 is also the widest at the central portion of the inclined surface 323D-2 when viewed in the circumferential direction, and becomes narrower as the distance from the central portion increases along the circumferential direction.

  The inclined surface 323D-1 and the inclined surface 323D-2 are inclined surfaces formed on the inner peripheral surface 324 side of the end surface in the −y direction of the lower washer 32D. In the inclined surfaces 323D-1 and 323D-2, the thickness in the y-axis direction decreases from the outer peripheral surface 325 side toward the inner peripheral surface 324 side. When the lower washer 32D is viewed in the + y direction, the inclined surface 323D-1 is predetermined along the circumferential direction between the mating surface on the downstream side in the rotational direction of the crankshaft 1 and the central portion in the x-axis direction. It is provided in the range. The width in the radial direction of the inclined surface 323D-1 is the largest in the central portion of the inclined surface 323D-1 when viewed in the circumferential direction, and becomes narrower as the distance from the central portion increases in the circumferential direction. In addition, the inclined surface 323D-2 is provided in a predetermined range along the circumferential direction between the mating surface on the upstream side in the rotation direction of the crankshaft 1 and the central portion in the x-axis direction. The radial width of the inclined surface 323D-2 is also the widest at the central portion of the inclined surface 323D-2 when viewed in the circumferential direction, and becomes narrower as the distance from the central portion increases along the circumferential direction.

  In the case where a portion that strongly strikes the thrust surface is generated in the vicinity of the mating surface, in the present modification, since the inclined surface is not provided on the inner peripheral side from the strongly contacted portion, the sliding surface 310 and the sliding surface 320 are provided. The portion that strongly hits against the thrust surface in FIG. 3 slidably lubricates lubricating oil from the inclined surface 313D-1, the inclined surface 313D-2, the inclined surface 323D-1, and the inclined surface 323D-2 while ensuring a sliding surface with respect to the thrust surface. It can supply to the moving surface 310 and the sliding surface 320, and can suppress seizing.

(Modification 5)
FIG. 7 is a front view of a crank washer 30E according to a modification of the present invention. 8 is a sectional view taken along line BB, sectional view taken along line CC, sectional view taken along line DD, sectional view taken along line EE, sectional view taken along line FF and sectional view taken along line GG in FIG. It is. The crank washer 30E includes a semi-annular flat plate upper washer 31E and a semi-annular flat plate lower washer 32E. The upper washer 31E has an inclined surface 313E instead of the inclined surface 313, and the lower washer 32E has an inclined surface 323E instead of the inclined surface 323. In the following description, the same configuration as that of the upper washer 31 in the upper washer 31E and the same configuration as that of the lower washer 32 in the lower washer 32E are denoted by the same reference numerals in the drawings, and description thereof is omitted.

  The inclined surface 313E is an inclined surface formed on the inner peripheral surface 314 side of the end surface in the −y direction of the upper washer 31E. The inclined surface 313E has a predetermined width w in the radial direction when viewed in the + y direction. Further, the inclined surface 313E has a thickness in the y-axis direction that decreases from the outer peripheral surface 315 side toward the inner peripheral surface 314 side.

  Further, when the depth in the + y direction of the inclined surface 313E at the position of the inner peripheral surface 314 is viewed, at the position along the line BB in FIG. 7, that is, on the upstream side in the rotational direction of the crankshaft 1, FIG. As shown in FIG. 8, the depth is d1, and at the position of the CC line in FIG. 7, that is, in the central portion in the x-axis direction, the depth is d2, as shown in FIG. At the position of the line D-D in FIG. 7, that is, on the downstream side in the rotation direction of the crankshaft 1, the depth is d3 as shown in FIG. The relationship between d1, d2, and d3 is d1> d2> d3, and the inclined surface 313E decreases in depth from the upstream mating surface side to the downstream mating surface side in the rotational direction of the crankshaft 1. It has become. In other words, the angle formed between the inclined surface 313E and the sliding surface 310 decreases from the mating surface on the upstream side in the rotation direction of the crankshaft 1 toward the mating surface on the downstream side.

  The inclined surface 323E is an inclined surface formed on the inner peripheral surface 324 side of the end surface in the −y direction of the lower washer 32E. The inclined surface 323E has a predetermined width w in the radial direction when viewed in the + y direction. In addition, the inclined surface 323E has a thickness in the y-axis direction that decreases from the outer peripheral surface 325 side toward the inner peripheral surface 324 side.

  Further, looking at the depth in the + y direction of the inclined surface 323E at the position of the inner peripheral surface 324, at the position of the GG line in FIG. 7, that is, at the upstream side in the rotational direction of the crankshaft 1, FIG. As shown in FIG. 8, at the position of the line FF in FIG. 7, that is, at the center in the x-axis direction, it is the depth of d2 as shown in FIG. At the position of the EE line in FIG. 7, that is, on the downstream side in the rotation direction of the crankshaft 1, the depth is d3 as shown in FIG. That is, the inclined surface 323E becomes shallower as it goes from the mating surface on the upstream side in the rotation direction of the crankshaft 1 toward the mating surface on the downstream side, like the inclined surface 313E. In other words, the angle formed between the inclined surface 323 </ b> E and the sliding surface 320 decreases from the mating surface on the upstream side in the rotation direction of the crankshaft 1 toward the mating surface on the downstream side.

  In the crank washer 30E, in the vicinity of the mating surface where the amount of lubricant flowing from the main bearing 10 is large, the depth of the inclined surface 313E and the depth of the inclined surface 323E are increased. 310 and sliding surface 320 can be supplied. In the modification described above, the depths of the inclined surface 313E and the inclined surface 323E are shallow from the upstream side in the rotational direction of the crankshaft 1 toward the downstream side, but from the upstream side in the rotational direction toward the downstream side. The depth may be shallower, the shallowest at the center in the x-axis direction, and deeper from the center in the x-axis direction toward the downstream side in the rotation direction.

(Modification 6)
FIG. 9 is a front view of a crank washer 30F according to a modification of the present invention. The crank washer 30F includes a semi-annular flat plate upper washer 31F and a semi-annular flat plate lower washer 32F. The upper washer 31F further includes an inclined surface 316 as compared with the upper washer 31, and the lower washer 32F further includes an inclined surface 326 as compared with the lower washer 32. In the following description, the same configuration as that of the upper washer 31 in the upper washer 31F and the same configuration as that of the lower washer 32 in the lower washer 32F are denoted by the same reference numerals in the drawings, and description thereof is omitted.

  The inclined surface 316 which is an example of the 2nd inclined surface which concerns on this invention is an inclined surface formed in the outer peripheral surface 315 side of the end surface of the -y direction of the upper washer 31F. The inclined surface 316 has a constant width in the radial direction when viewed in the + y direction. Further, the inclined surface 316 has a thickness in the y-axis direction that decreases from the inner peripheral surface 314 side toward the outer peripheral surface 315 side. The inclined surface 326 which is an example of the second inclined surface according to the present invention is an inclined surface formed on the outer peripheral surface 325 side of the end surface in the −y direction of the lower washer 32F. The inclined surface 326 has a predetermined width in the radial direction when viewed in the + y direction. Further, the inclined surface 326 has a thickness in the y-axis direction that decreases from the inner peripheral surface 324 side toward the outer peripheral surface 325 side.

  According to this modification, even if the thrust surface of the crankshaft 1 is inclined with respect to the sliding surface 310 or the sliding surface 320 due to the deflection of the crankshaft 1, the inclined surface 316 or the inclined surface 326 is inclined to the inclined thrust surface. Since the surface hits, compared with the case where the inclined surface 316 and the inclined surface 326 are not provided, the contact of the thrust surface with the crank washer 30 is relaxed, and the occurrence of seizure can be suppressed. The inclined surface 316 and the inclined surface 326 may be configured to be provided not in the entire circumferential direction but in a part in the circumferential direction.

(Modification 7)
In the embodiment and the modification described above, the surface of the inclined surface is flat from the outer peripheral surface side toward the inner peripheral surface side, but the surface of the inclined surface may not be flat. FIG. 10 is an enlarged view of a cross section obtained by cutting the upper washer 31G and the upper washer 31H according to the modification in the radial direction.

  The upper washer 31G has an inclined surface 313G. The surface of the inclined surface 313G is a curved surface that is recessed in the + y direction, as shown in FIG. The upper washer 31H has an inclined surface 313H. The surface of the inclined surface 313H is a curved surface convex in the −y direction, as shown in FIG. In addition, it is good also as a structure which has the surface similar to the inclined surface 313G or the inclined surface 313H shown in FIG. 10 also in the inclined surface of a lower washer.

(Modification 8)
Although the crank washer according to the above-described embodiment and modification includes the notch 312 and the notch 322, the crank washer may not have the notch 312 and the notch 322.

(Modification 9)
In the embodiment and the modification described above, the inclined surface is provided on both the upper washer and the lower washer. However, the inclined surface may be provided on only one of the upper washer and the lower washer.

DESCRIPTION OF SYMBOLS 1 ... Crankshaft 2 ... Connecting rod 10 ... Main bearing 20 ... Connecting rod bearing 30, 30A, 30B, 30C, 30D, 30E, 30F ... Crank washer 31, 31A, 31B, 31C, 31D, 31E, 31F, 31G, 31H, 31J: Upper washer 32, 32A, 32B, 32C, 32D, 32E, 32F ... Lower washer 310 ... Sliding surface 320 ... Sliding surface 313, 313A, 313B, 313C, 313D-1, 313D-2, 313E, 313G, 313H, 313J ... inclined surface 312 ... notch 314 ... inner peripheral surface 315 ... outer peripheral surface 316 ... inclined surface 320 ... sliding surface 321 ... detent 323, 323A, 323B, 323D-1, 323D-2, 323E ... inclined surface 322 ... Notch 324 ... Inner peripheral surface 325 ... Outer peripheral surface 326 ... Inclined surface

Claims (8)

A semi-annular crank washer having a sliding surface that receives the axial force of the rotating shaft,
A crank washer comprising a first inclined surface formed between an inner peripheral surface and the sliding surface.   The crank washer according to claim 1, wherein the first inclined surface is provided in the entire circumferential direction. 3. The crank washer according to claim 1, wherein a width of the first inclined surface in a radial direction is narrower from an upstream side in a rotational direction of the rotary shaft toward a downstream side in the rotational direction. The crank washer according to claim 2, wherein the first inclined surface is formed such that a radial width in a predetermined portion in the circumferential direction is narrower than a portion other than the predetermined portion. 3. The crank washer according to claim 2, wherein a radial width of the first inclined surface is narrower from a circumferential end side toward a central side. The depth from the said sliding surface of the said 1st inclined surface is formed shallowly as it goes to the rotation direction downstream from the rotation direction upstream of the said rotating shaft. Crank washer as described. The crank washer according to claim 2, wherein a depth of the first inclined surface from the sliding surface is shallower from an end in the circumferential direction toward the center. The crank washer according to any one of claims 1 to 7, further comprising a second inclined surface formed between an outer peripheral surface and the sliding surface.

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