JP7023617B2 - Crank washer - Google Patents

Description

The present invention relates to a crank washer.

As an invention for increasing the amount of lubricating oil held on the surface of a thrust washer, for example, there is a thrust washer disclosed in Patent Document 1. This thrust washer has oil grooves along the vertical direction, and a herringbone-shaped texture formed by regular uneven portions is provided on the outer side in the axial direction. Due to this texture, the amount of lubricating oil held on the surface of the thrust washer increases and oil film pressure is generated, so that contact between the thrust surface of the crankshaft and the thrust washer can be prevented and seizure can be prevented.

Japanese Unexamined Patent Publication No. 2015-169293

When the thrust washer is provided with an oil groove, the lubricating oil easily escapes from the inner peripheral side to the outer peripheral side through the oil groove. Further, the texture provided on the thrust washer is formed by surface treatment, but the surface treatment is troublesome and costly.

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

The present invention is a semicircular 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 a crank washer.

In the present invention, the first inclined surface may be provided in the entire circumferential direction.

Further, in the present invention, the radial width of the first inclined surface may be formed narrower from the upstream side in the rotation direction to the downstream side in the rotation direction of the rotation axis.

Further, in the present invention, the first inclined surface may be formed so that the radial width in the predetermined portion in the circumferential direction is narrower than that in the portion other than the predetermined portion.

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

Further, in the present invention, the depth of the first inclined surface from the sliding surface may be formed to be shallower from the upstream side in the rotation direction to the downstream side in the rotation direction of the rotation axis. ..

Further, in the present invention, the depth of the first inclined surface from the sliding surface may be formed to be shallower from the end side in the circumferential direction toward the center side.

Further, in the present invention, the configuration may include a second inclined surface formed between the outer peripheral surface and the sliding surface.

According to the present invention, oil can be positively flowed into the sliding surface in the crank washer to suppress seizure.

The figure which illustrates the crankshaft 1 in an internal combustion engine. Front view and sectional view of the crank washer 30. The front view of the crank washer 30A which concerns on the modification. The front view of the crank washer 30B which concerns on the modification. The front view of the crank washer 30C which concerns on the modification. Front view of the crank washer 30D according to the modified example. Front view of the crank washer 30E according to the modified example. Sectional drawing of the crank washer 30E. Front view of the crank washer 30F according to the modified example. 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 which 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) to grip the journal of the crankshaft 1 and support the crankshaft 1. The connecting rod bearing 20 is a bearing that is attached to the connecting rod 2 to grip the pin of the crankshaft 1 and support the connecting rod 2. The crank washer 30, which is an example of the thrust washer according to the present invention, is a bearing used in combination with the main bearing 10 to support the axial force of the crankshaft 1. The crank washer 30 also has a function of axially positioning the crankshaft 1 and the cylinder block.

FIG. 2A is a front view of the crank washer 30, and FIG. 2B is a sectional view taken along line AA of FIG. 2A. In the figure, the 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. Of the symbols representing the coordinate system in the figure, the symbol with two intersecting lines in the circle represents the arrow from the front side to the back side of the paper, and the symbol with the black circle drawn in the circle is , Represents an arrow pointing from the back side of the page to the front side. Further, in the coordinate system of the drawing, the direction along the x-axis is referred to as the x-axis direction. Further, in the x-axis direction, the direction in which the x component increases is referred to as the + x direction, and the direction in which the x component decreases is referred to as the −x direction. The y and z components are also defined as the y-axis direction, the + y direction, the −y direction, the z-axis direction, the + z direction, and the −z direction according to the above definitions.

The crank washer 30 is composed of an upper washer 31 having a semicircular shape and a flat plate, and a lower washer 32 having a semicircular shape and a flat plate. The upper washer 31 and the lower washer 32 are examples of the crank washer according to the present invention. The crank washers 30 are a set of two, and are assembled by facing the surfaces on the opposite sides of the sliding surface 310 and the sliding surface 320, which will be described later, with a housing (not shown) sandwiched between them. The crank washer 30 may not include the lower washer 32 and may be only the upper washer 31.

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 as well. The sliding surface 310 is a surface that slides on the crankshaft 1 and is a portion that receives a 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 thickness of the inclined surface 313 decreases in the y-axis direction from the outer peripheral surface 315 side toward the inner peripheral surface 314 side.

The lower washer 32 has a detent 321 and a sliding surface 320, a notch 322 and an inclined surface 323. The detent 321 is hooked on a detent groove provided in a housing (not shown) to prevent the lower washer 32 from rotating with the rotation of the crankshaft 1. Further, the detent 321 is hooked on the detent groove of the housing to suppress the rotation of the lower washer 32, so that the rotation of the upper washer 31 is also suppressed. A "relief" may be provided at the base of the detent 321 to prevent interference with the detent groove.

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 as well. The sliding surface 320 is a surface that slides on the crankshaft 1 and is a portion that receives a 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 of the lower washer 32 in the −y direction. When viewed in the + y direction, the inclined surface 323 has a predetermined width w in the radial direction. Further, the thickness of the inclined surface 323 decreases in the y-axis direction from the outer peripheral surface 325 side toward the inner peripheral surface 324 side.

As a method for manufacturing 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 metal, the upper washer 31 and the lower washer 32 can be obtained by pressing or cutting a plate-shaped metal. When the material of the upper washer 31 and the lower washer 32 is metal, the inclined surface 313 and the inclined surface 323 are formed by a die or cutting during press working. 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 an injection molding or compression molding die.

When 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 from the main bearing 10 and then flows to the inclined surface 313 and the inclined surface 323. Since the inclined surface 313 is provided on the sliding surface 310 side over the entire circumferential direction of the upper washer 31, and the inclined surface 323 is provided over the entire circumferential direction of the lower washer 32, the lubricating oil is inclined. It is supplied from the surface 313 and the inclined surface 323 to the entire sliding surface 310 and the sliding surface 320.

In the case where the inclined surface 313 and the inclined surface 323 are not provided in the crank washer 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 the present 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 inclined surface 313 and the inclined surface 323 are not provided and the oil groove is provided. 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 the sliding surface 310 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 surface treatment for holding the lubricating oil on the sliding surface 310 and the sliding surface 320. It is possible to reduce the man-hours and costs of manufacturing as compared with the configuration in which surface processing is performed.

[Modification example]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented in various other embodiments. For example, the present invention may be carried out by modifying the above-described embodiment as follows. The above-described embodiment and the following modifications may be combined.

(Modification 1)
FIG. 3 is a front view of the crank washer 30A according to a modified example of the present invention. The crank washer 30A is composed of a semi-circular shape and a flat plate upper washer 31A and a semi-circular shape and a 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 upper washer 31A having the same configuration as the upper washer 31 and the lower washer 32A having the same configuration as the lower washer 32 are designated by the same reference numerals in the drawings, and the 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 of the upper washer 31A in the −y direction. 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. Looking at the upper washer 31A in the + y direction, the radial width of the inclined surface 313A is narrowest in the central portion in the x-axis direction and widens toward the mating surface along the circumferential direction from the central portion in the x-axis direction. It has become.

The inclined surface 323A is an inclined surface formed on the inner peripheral surface 324 side of the end surface of the lower washer 32A in the −y direction. In the inclined surface 323A, the thickness in the y-axis direction decreases from the outer peripheral surface 325 side to the inner peripheral surface 324 side. Looking at the lower washer 32A in the + y direction, the radial width of the inclined surface 323A is narrowest in the central portion in the x-axis direction and widens toward the mating surface along the circumferential direction from the central portion in the x-axis 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 larger than that in the central portion in the x-axis direction. In this modification, since the width of the inclined surface 313A and the width of the inclined surface 323A are wide in the vicinity of the mating surface where the amount of lubricating oil flowing from the main bearing 10 is large, a large amount of lubricating oil is applied to the sliding surface. It can be supplied to the 310 and the sliding surface 320.

(Modification 2)
FIG. 4 is a front view of the crank washer 30B according to a modified example of the present invention. The crank washer 30B has a semicircular shape and is composed of an upper washer 31B of a flat plate and a semicircular shape and a lower washer 32B of a flat plate. 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 upper washer 31B having the same configuration as the upper washer 31 and the lower washer 32B having the same configuration as the lower washer 32 are designated by the same reference numerals in the drawings, and the description thereof will be omitted.

The inclined surface 313B is an inclined surface formed on a part of the inner peripheral surface 314 side at the end surface of the upper washer 31B in the −y direction. In the embodiment, the inclined surface 313 is provided on the sliding surface 310 side over the entire circumferential direction, whereas the inclined surface 313B is provided in the circumferential direction from the mating surface side on the upstream side in the rotation direction of the crankshaft 1. It differs in that it is provided up to a predetermined distance along the line and is 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. Looking at the upper washer 31B in the + y direction, the radial width of the inclined surface 313B is wider on the mating surface side on the upstream side in the rotation direction of the crankshaft 1, and as it goes toward the downstream side in the rotation direction of the crankshaft 1 along the circumferential direction. It's getting narrower.

The inclined surface 323B is an inclined surface formed on a part of the inner peripheral surface 324 side at the end surface of the lower washer 32B in the −y direction. In the embodiment, the inclined surface 323 is provided on the sliding surface 320 side over the entire circumferential direction, whereas the inclined surface 323B is provided in the circumferential direction from the mating surface side on the upstream side of the rotation direction of the crankshaft 1. It differs in that it is provided up to a predetermined distance along the line and is 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 to the inner peripheral surface 324 side. Looking at the lower washer 32B in the + y direction, the radial width of the inclined surface 323B is wider on the mating surface side on the upstream side in the rotation direction of the crankshaft 1, and as it goes toward the downstream side in the rotation direction of the crankshaft 1 along the circumferential direction. It's getting narrower.

Also in this modification, since the width of the inclined surface 313B and the width of the inclined surface 323B are wide in the vicinity of the mating surface where the amount of lubricating oil flowing from the main bearing 10 is large, a large amount of lubricating oil is applied to the sliding surface. It can be supplied to the 310 and the sliding surface 320.

(Modification 3)
FIG. 5 is a front view of the crank washer 30C according to a modified example of the present invention. The crank washer 30C has a semicircular shape and is composed of an upper washer 31C of a flat plate and a semicircular shape and a lower washer 32C of a flat plate. 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 the upper washer 31 in the upper washer 31C and the same configuration as the lower washer 32 in the lower washer 32C are designated by the same reference numerals in the drawings, and the 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 of the upper washer 31C in the −y direction. 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. Looking at the upper washer 31A in the + y direction, the radial width of the inclined surface 313C is widest in the central portion in the x-axis direction and narrows toward the mating surface along the circumferential direction from the central portion in the x-axis direction. It has become.

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

In the sliding surface 310 and the sliding surface 320, depending on the type of engine, the upstream side and the downstream side in the rotation direction of the crankshaft 1, that is, the predetermined portion near the mating surface is relative to the thrust surface from other positions. It will be a strong hit part. In this modification, since the widths of the inclined surface 313C and the inclined surface 323C are narrowed on the inner peripheral side of this portion, a sliding surface with respect to the thrust surface can be secured. Further, since the widths of the inclined surface 313C and the inclined surface 323C become wider 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. It can be supplied to 320.

(Modification example 4)
FIG. 6 is a front view of the crank washer 30D according to a modified example of the present invention. The crank washer 30D is composed of a semi-circular shape and a flat plate upper washer 31D and a semi-circular shape and a 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 upper washer 31D having the same configuration as the upper washer 31 and the lower washer 32D having the same configuration as the lower washer 32 are designated by the same reference numerals in the drawings, and the description thereof will be omitted.

The inclined surface 313D-1 and the inclined surface 313D-2 are inclined surfaces formed on a part of the inner peripheral surface 314 side of the end surface in the −y direction of the upper washer 31D. 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 to the inner peripheral surface 314 side. When the upper washer 31D is viewed in the + y direction, the inclined surface 313D-1 is predetermined along the circumferential direction between the mating surface on the upstream side of the rotation 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 widest 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 is increased along the circumferential direction. Further, 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 widest in the central portion of the inclined surface 323D-2 when viewed in the circumferential direction, and narrows as the distance from the central portion is increased 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 of the lower washer 32D in the −y direction. In the inclined surface 323D-1 and the inclined surface 323D-2, the thickness in the y-axis direction decreases from the outer peripheral surface 325 side to 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 of the rotation 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 323D-1 is widest 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 is increased along the circumferential direction. Further, 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 widest in the central portion of the inclined surface 323D-2 when viewed in the circumferential direction, and narrows as the distance from the central portion is increased along the circumferential direction.

When a portion that strongly hits the thrust surface occurs in the vicinity of the mating surface, the sliding surface 310 and the sliding surface 320 are provided in this modified example because the inclined surface is not provided on the inner peripheral side of the strongly hitting portion. In the portion that strongly hits the thrust surface, lubricating oil is slid from the inclined surface 313D-1, the inclined surface 313D-2, the inclined surface 323D-1, and the inclined surface 323D-2 while securing the sliding surface with respect to the thrust surface. It can be supplied to the moving surface 310 and the sliding surface 320 to suppress seizure.

(Modification 5)
FIG. 7 is a front view of the crank washer 30E according to a modified example of the present invention. Further, FIG. 8 is a sectional view taken along line BB, a sectional view taken along line CC, a sectional view taken along line DD, a sectional view taken along line EE, a sectional view taken along line FF, and a sectional view taken along line GG. Is. The crank washer 30E is composed of a semi-circular shape and a flat plate upper washer 31E and a semi-circular shape and a 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 upper washer 31E having the same configuration as the upper washer 31 and the lower washer 32E having the same configuration as the lower washer 32 are designated by the same reference numerals in the drawings, and the description thereof will be omitted.

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

Looking at the depth of the inclined surface 313E at the position of the inner peripheral surface 314 in the + y direction, the position of the line BB in FIG. 7, that is, on the upstream side in the rotation direction of the crankshaft 1, is shown in FIG. It is the depth of d1 as shown in FIG. 7, and at the position of the CC line in FIG. 7, that is, at the central portion in the x-axis direction, it is the depth of d2 as shown in FIG. 8 (b). At the position of the DD 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. 8 (c). The relationship between d1, d2 and d3 is d1> d2> d3, and the depth of the inclined surface 313E becomes shallower from the mating surface side on the upstream side in the rotation direction of the crankshaft 1 toward the mating surface side on the downstream side. It has become. In other words, the angle formed by the surface of the inclined surface 313E with the sliding surface 310 decreases from the mating surface side on the upstream side in the rotation direction of the crankshaft 1 toward the mating surface side on the downstream side.

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

Looking at the depth of the inclined surface 323E in the + y direction at the position of the inner peripheral surface 324, the position of the GG line in FIG. 7, that is, on the upstream side in the rotation direction of the crankshaft 1, is shown in FIG. It is the depth of d1 as shown in FIG. 7, and at the position of the FF line in FIG. 7, that is, at the central portion in the x-axis direction, it is the depth of d2 as shown in FIG. 8 (e). 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. 8 (f). That is, like the inclined surface 313E, the inclined surface 323E becomes shallower from the mating surface side on the upstream side in the rotation direction of the crankshaft 1 toward the mating surface side on the downstream side. In other words, the angle formed by the surface of the inclined surface 323E with the sliding surface 320 decreases from the mating surface side on the upstream side in the rotation direction of the crankshaft 1 toward the mating surface side on the downstream side.

The crank washer 30E has a large amount of lubricating oil flowing from the main bearing 10 in the vicinity of the mating surface, and the depth of the inclined surface 313E and the depth of the inclined surface 323E are deep. It can be supplied to the 310 and the sliding surface 320. In the above-mentioned modification, the depths of the inclined surface 313E and the inclined surface 323E are shallow from the upstream side to the downstream side in the rotation direction of the crankshaft 1, but are toward the downstream side from the upstream side in the rotation direction. It may be shallow, shallowest in the central portion in the x-axis direction, and deeper from the central portion in the x-axis direction toward the downstream side in the rotation direction.

(Modification 6)
FIG. 9 is a front view of the crank washer 30F according to a modified example of the present invention. The crank washer 30F is composed of a semi-circular shape and a flat plate upper washer 31F and a semi-circular shape and a flat plate lower washer 32F. The upper washer 31F further has an inclined surface 316 as compared to the upper washer 31, and the lower washer 32F further has an inclined surface 326 as compared to the lower washer 32. In the following description, the same configuration as the upper washer 31 in the upper washer 31F and the same configuration as the lower washer 32 in the lower washer 32F are designated by the same reference numerals in the drawings, and the description thereof will be omitted.

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

According to this modification, even if the thrust surface of the crankshaft 1 is tilted 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 tilted to the tilted thrust surface. Since the surface is in contact with the crank washer 30, the contact of the thrust surface with the crank washer 30 is alleviated as compared with the case where the inclined surface 316 and the inclined surface 326 are not provided, and the occurrence of seizure can be suppressed. The inclined surface 316 and the inclined surface 326 may be provided not as a whole in the circumferential direction but as a part of the circumferential direction.

(Modification 7)
In the above-described embodiments and modifications, the surface of the inclined surface is flat from the outer peripheral surface side to the inner peripheral surface side, but the surface of the inclined surface does not have to 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 modified example in the radial direction.

The upper washer 31G has an inclined surface 313G. As shown in FIG. 10A, the surface of the inclined surface 313G is a curved surface recessed in the + y direction. The upper washer 31H has an inclined surface 313H. As shown in FIG. 10B, the surface of the inclined surface 313H is a curved surface convex in the −y direction. The inclined surface of the lower washer may have the same surface as the inclined surface 313G or the inclined surface 313H shown in FIG. 10.

(Modification 8)
The crank washer according to the above-described embodiment and modification has a notch 312 and a notch 322, but may be configured not to have a notch 312 and a notch 322.

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

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 ... Anti-rotation 323, 323A, 323B, 323D-1, 323D-2, 323E ... Inclined surface 322 ... Notch 324 ... Inner peripheral surface 325 ... Outer peripheral surface 326 ... Inclined surface

Claims (7)

A semi-circular crank washer with a sliding surface that receives an axial force on the axis of rotation.
It is provided with an inclined surface formed between an inner peripheral surface having an arc shape having no protrusion and the sliding surface.
The length of the inclined surface in the radial direction of the rotating shaft is longer than the length in the axial direction.
A crank washer with no inclined surface between the outer peripheral surface and the sliding surface. The crank washer according to claim 1, wherein the inclined surface is provided on the entire circumferential direction. A semi-circular crank washer with a sliding surface that receives an axial force on the axis of rotation.
An inclined surface formed between the inner peripheral surface and the sliding surface.
Equipped with
The length of the inclined surface in the radial direction of the rotating shaft is longer than the length in the axial direction.
There is no inclined surface between the outer peripheral surface and the sliding surface,
The inclined surface is provided in the entire circumferential direction, and is provided.
The radial width of the inclined surface is formed narrower from the upstream side in the rotation direction to the downstream side in the rotation direction of the rotation axis .
Crank washer. A semi-circular crank washer with a sliding surface that receives an axial force on the axis of rotation.
An inclined surface formed between the inner peripheral surface and the sliding surface.
Equipped with
The length of the inclined surface in the radial direction of the rotating shaft is longer than the length in the axial direction.
There is no inclined surface between the outer peripheral surface and the sliding surface,
The inclined surface is provided in the entire circumferential direction, and is provided.
The inclined surface is formed so that the radial width of the predetermined portion in the circumferential direction is narrower than that of the portion other than the predetermined portion .
Crank washer. A semi-circular crank washer with a sliding surface that receives an axial force on the axis of rotation.
An inclined surface formed between the inner peripheral surface and the sliding surface.
Equipped with
The length of the inclined surface in the radial direction of the rotating shaft is longer than the length in the axial direction.
There is no inclined surface between the outer peripheral surface and the sliding surface,
The inclined surface is provided in the entire circumferential direction, and is provided.
The radial width of the inclined surface is formed narrower from the end side in the circumferential direction toward the center side .
Crank washer. A semi-circular crank washer with a sliding surface that receives an axial force on the axis of rotation.
An inclined surface formed between the inner peripheral surface and the sliding surface.
Equipped with
The length of the inclined surface in the radial direction of the rotating shaft is longer than the length in the axial direction.
There is no inclined surface between the outer peripheral surface and the sliding surface,
The depth of the inclined surface from the sliding surface is formed to be shallower from the upstream side in the rotation direction to the downstream side in the rotation direction of the rotation axis .
Crank washer. A semi-circular crank washer with a sliding surface that receives an axial force on the axis of rotation.
An inclined surface formed between the inner peripheral surface and the sliding surface.
Equipped with
The length of the inclined surface in the radial direction of the rotating shaft is longer than the length in the axial direction.
There is no inclined surface between the outer peripheral surface and the sliding surface,
The inclined surface is provided in the entire circumferential direction, and is provided.
The depth of the inclined surface from the sliding surface is formed to be shallower from the end side in the circumferential direction toward the center side .
Crank washer.

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