JP2013036482A - Bearing metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing metal capable of securing a sliding area and effectively avoiding lubrication failure and fretting.SOLUTION: The bearing metal 21 includes: a bearing face 26 located along a center in the width direction of an inner peripheral face 25 of the bearing metal 21 fitted to a bearing fitting face 6 of a connecting rod large end portion 5; and inclined step faces 27, 28 located between both side edges 26a, 26b and side ends 23a, 23b of the bearing face 26. A positioning pawl 29 projecting from the inner peripheral side to the outer peripheral side is cut and erected on the one step face 28. The bearing face 26 is formed without being effected by the positioning pawl 29 and an oil film of lubricating oil and a sliding area can be secured between the bearing face 26 and a crank pin p, so as to achieve good lubrication. Adhesion between an outer peripheral face 24 of the bearing metal 21 and the bearing fitting face 6 is improved and fretting can be suppressed, so as to maintain the bearing quality.

Description

  The present invention relates to a bearing metal, for example, a bearing metal that is attached to a large end portion of a connecting rod in an engine and rotatably supports a crankpin of a crankshaft.

  Generally, a connecting rod of an engine has a cylindrical connecting rod body in which a small end portion to which a piston is coupled by a piston pin and a large end portion of a half-shaped connecting rod are integrally coupled by a connecting portion, and a half-shaped connecting rod cap. And a cylindrical large end portion that is rotatably coupled to the crankpin of the crankshaft is configured by attaching a connecting rod cap to the large end portion of the connecting rod.

  A semi-cylindrical bearing metal is attached to the bearing fitting surface formed on the inner periphery of the connecting rod large end and the bearing fitting surface formed on the inner periphery of the connecting rod cap. A sliding surface is secured between the bearing metal and the crank pin, and an oil film of lubricating oil is generated, so that a large load can be supported by the oil film pressure. Here, a fitting recess is formed in the circumferential end of the bearing fitting surface of the connecting rod large end, and a positioning claw protruding from the circumferential end of the bearing metal to the outer peripheral side is fitted into this fitting recess. The bearing metal is positioned and assembled. Similarly, in the connecting rod cap, a fitting recess is formed at the circumferential end of the bearing fitting surface, and the bearing metal is assembled by fitting a positioning claw of the bearing metal into the fitting recess.

  Various bearing metals are known in which this type of positioning claw is formed. As an example, a bearing metal disclosed in Patent Document 1 will be described with reference to FIG. FIG. 15A is an exploded perspective view of the connecting rod large end and the connecting rod cap on which the bearing metal is mounted, and FIG. 15B is a perspective view of the bearing metal mounted on the connecting rod large end and the connecting rod cap. .

  As shown in FIG. 15 (a), the connecting rod large end 101 has a bearing fitting surface 102 having a semicircular cross section, that is, a so-called semicylindrical inner peripheral surface, and a pair of planar joining surfaces 103a and 103b. A fitting recess 104 is formed at the circumferential end of the fitting surface 102. Similarly, the connecting rod cap 105 has a semi-cylindrical inner peripheral surface bearing fitting surface 106 and a pair of planar joining surfaces 107a and 107b, and a fitting recess (not shown) at the circumferential end of the bearing fitting surface 106. 108 is formed.

  On the other hand, as shown in FIG. 15 (b), a bearing metal 111 attached to the bearing fitting surface 102 of the connecting rod large end 101 has a metal body 112 having a shape obtained by bending a thin plate into a substantially semi-cylindrical shape. A protrusion 113 protruding outward is formed at one circumferential end of the main body 112. Similarly, the bearing metal 115 attached to the bearing fitting surface 106 of the connecting rod cap 105 has a metal body 116 formed by bending a thin plate into a substantially semi-cylindrical shape, and an outer periphery is provided at one circumferential end of the metal body 116. A protruding portion 117 protruding to the side is formed.

  The metal body 112 is fitted to the bearing fitting surface 102 of the connecting rod large end 101 and the projection 113 is fitted to the fitting recess 104 to be attached to the connecting rod large end 101. Similarly, the bearing metal 115 is mounted on the connecting rod cap 105 with the metal main body 116 fitted into the bearing fitting surface 106 of the connecting rod cap 105 and the projection 117 fitted into the fitting recess 108.

  The bearing fitting surface 102 of the connecting rod large end 101 to which the bearing metal 111 is attached and the bearing fitting surface 106 of the connecting rod cap 105 to which the bearing metal 115 is attached are opposed to each other, and the joint surfaces 103a, 107a and 103b are mutually connected. 107b and the connecting rod large end portion 101 and the connecting rod cap 105 are bolted together to form a large end portion 109 that pivotally supports the crank pin.

  As shown in FIG. 16, Patent Document 2 includes a metal main body 122 having a shape in which a thin plate attached to a bearing fitting surface such as a connecting rod large end and a connecting rod cap is bent into a substantially semi-cylindrical shape. A bearing metal 121 is disclosed in which a positioning claw 123 that can be fitted into a fitting recess is cut and raised from an inner circumferential side to an outer circumferential side at one circumferential end of a main body 122.

  Further, Patent Document 3 includes a metal main body 126 having a shape obtained by bending a thin plate into a substantially semi-cylindrical shape as shown in FIG. 17, and has an inner circumference at the center in the width direction of one circumferential end of the metal main body 126. A bearing metal 125 is disclosed in which a positioning claw 127 bulging from the side to the outer peripheral side is formed.

Japanese Utility Model Publication No. 3-127815 Japanese Patent Laid-Open No. 9-210064 JP-A-10-110721

  According to Patent Document 1, the projection 113 is fitted into the fitting recess 104 of the connecting rod large end 101 to position the bearing metal 111 and abut against the joint surface 107a of the connecting rod cap 105 to crank the bearing metal 111. Along with the rotation of the pin can be prevented. Similarly, when the projection 117 is fitted into the fitting recess 108 of the connecting rod cap 105, the bearing metal 115 is positioned and abutted against the joint surface 103 b of the connecting rod large end 101 to rotate the crank pin of the bearing metal 15. It is kept in a state in which accompanying rotation is prevented.

  On the other hand, as the engine output increases, the load acting on the crankpin of the crankshaft also tends to increase, and the load acting on the connecting rod large end and the connecting rod cap constituting the large end supporting the crankpin. Will also increase. When the bearing metal 111, 115 as described in Patent Document 1 is incorporated in the large end portion of such a connecting rod, a gap is generated between the projection 113 of the bearing metal 111 and the fitting recess 104, Due to this gap, the pressure contact force acting on the vicinity of the circumferential end of the metal body 112 where the projection 113 is formed is locally reduced, and the pressure contact force of the bearing fitting surface 102 of the connecting rod large end 101 to the metal body 112 is reduced. There is a possibility that the shape of the metal main body 104 changes locally due to non-uniformity.

  On the other hand, if the protrusion 113 is pressed against the fitting recess 104, so-called bottoming, there is a possibility that an excessive pressure contact force acts locally on the metal body 112 by the protrusion 113 and the shape of the metal body 112 changes locally. . Thus, when the shape of the bearing metal main body 112 changes, the contact between the crankpin and the bearing metal 111 is locally strengthened, and the oil film of the lubricating oil between the bearing metal 111 and the crankpin is unevenly distributed to induce poor lubrication. There is a fear. Further, the adhesion between the bearing metal 111 and the bearing fitting surface 102 of the connecting rod large end portion 101 is lowered, and the sliding between the bearing metal 111 and the bearing fitting surface 102 is induced, and the hitting is induced to fretting ( Fine friction), which causes wear and premature fatigue.

  Similarly, when a gap or pressure contact is generated between the protrusion 117 of the bearing metal 115 and the fitting recess 108, the pressure contact force of the bearing fitting surface 106 of the connecting rod cap 105 to the metal main body 116 becomes uneven, and the crank pin and the bearing There is a possibility that the contact with the metal 115 is locally strong and the oil film of the lubricating oil between the bearing metal 115 and the crankpin is unevenly distributed to cause poor lubrication. In addition, the adhesion between the bearing metal 115 and the bearing fitting surface 106 of the connecting rod cap 105 is lowered, and the sliding between the bearing metal 115 and the bearing fitting surface 106 is induced, so that hitting is induced and fretting occurs. Wear and premature fatigue.

  Avoiding the clearance and pressure contact between the bearing metal positioning claw and the fitting recess can be appropriately maintained due to differences in the thermal expansion coefficient due to differences in processing accuracy and materials between the connecting rod and the bearing metal. It is practically difficult.

  The bearing metal 121 formed by cutting and raising the positioning claw 123 that fits into the fitting recess at the circumferential end of the metal main body 122 as in Patent Document 2 is similar to the bearing metals 111 and 115 in Patent Document 1. There is a possibility that the shape of the main body 122 may be locally changed. Further, the formation of the positioning claw 123 causes the bearing area of the metal main body 122 to be locally reduced, resulting in uneven pressure contact with the crank pin, and poor lubrication by the lubricating oil. There is a risk of becoming. Also in the bearing metal 125 formed by extruding the positioning claw 127 fitted into the fitting recess at the circumferential end of the metal body 126 from the inner peripheral side to the outer peripheral side as in Patent Document 3, the bearing metal 111 of Patent Document 1, 115, the shape of the metal main body 126 may change, and the formation of the positioning claw 127 will locally reduce the bearing area of the metal main body 126, resulting in uneven pressure contact with the crank pin and lubrication with lubricating oil. There is a risk of inducing defects.

  Accordingly, an object of the present invention made in view of such a point is to provide a bearing metal capable of ensuring a sliding area and effectively avoiding poor lubrication and fretting.

  The invention of the bearing metal according to claim 1, which achieves the above object, is provided on a bearing fitting surface having a semi-cylindrical inner surface formed on an inner periphery of a housing, on both side ends extending in a circumferential direction of the bearing fitting surface. The outer peripheral surface is fitted and mounted in a rectangular plate shape having a central portion and a circumferential end portion, and a semi-cylindrical shape that rotatably supports the rotating shaft by the inner peripheral surface. In the bearing metal formed with a positioning claw that protrudes in the direction and fits into a fitting recess formed in the housing, the inner peripheral surface continues from one circumferential end to the other circumferential end. Between the bearing surface and a side edge of the bearing surface and a side end portion, there is a step surface that is on the outer peripheral surface side from the bearing surface, and between the side edge and the side end portion of the bearing surface including the step surface. The positioning claw that protrudes from the inner peripheral side to the outer peripheral side is cut and raised at the circumferential end. And butterflies.

  According to this, since the positioning claw that protrudes from the inner peripheral side to the outer peripheral side is formed at the circumferential end between the side edge of the bearing surface and the side end formed on the inner peripheral surface of the bearing metal, the bearing The surface is formed without being affected by the positioning claw, and the sliding area between the rotating shaft and the bearing surface is ensured. Even if a clearance or pressure contact occurs between the positioning claw of the bearing metal and the fitting recess, the housing bearing The pressing force against the forming range of the bearing surface of the bearing metal by the fitting surface is uniform, the contact between the rotating shaft and the bearing surface of the bearing metal is uniform over the entire range, and the bearing surface of the bearing metal and the rotating shaft A lubrication area between them and a good oil film of lubricating oil can be secured, and good lubrication can be obtained.

  In addition, the adhesion between the outer peripheral surface of the bearing metal and the bearing fitting surface of the housing is improved, and sliding and hitting between the bearing metal and the bearing fitting surface, that is, fretting is suppressed, and wear and fatigue are reduced. In addition to being restrained and ensuring the axial width of the bearing metal, stable bearing quality is maintained for a long period of time.

  The invention of the bearing metal according to claim 2, which achieves the above object, comprises a bearing fitting surface formed on the inner circumference of the housing and having a semi-cylindrical inner surface, and both ends extending in the circumferential direction of the bearing fitting surface. The outer peripheral surface is fitted and mounted in a rectangular plate shape having a central portion and a circumferential end portion, and a semi-cylindrical shape that rotatably supports the rotating shaft by the inner peripheral surface. In the bearing metal formed with a positioning claw that protrudes in the direction and fits into a fitting recess formed in the housing, the inner circumferential surface extends from one circumferential end to the other circumferential end along the center in the width direction. A bearing surface that extends over the portion, and a step that is inclined between the side edges of the bearing surface and each side end portion so as to shift to the outer peripheral surface side from the side edge of the bearing surface to each side end portion. Between the side edge and the side end of the bearing surface including the one step surface. Kicking with a positioning pawl has a raised cutting formation projecting from the inner peripheral side to the outer circumferential side in the circumferential end portion.

  According to this, a stepped surface is formed between both sides of the bearing surface formed on the inner peripheral surface of the bearing metal and the side end so as to be separated from the rotating shaft, and the side of the bearing surface including one stepped surface Since the positioning claw that protrudes from the inner peripheral side to the outer peripheral side is formed at the circumferential end between the edge and the side end, the bearing surface is formed without being affected by the positioning claw, and the rotating shaft and the bearing surface The sliding contact area is secured, and even if a gap or pressure contact occurs between the bearing metal positioning claw and the fitting recess, the pressure contact force on the bearing metal bearing surface formation range by the bearing fitting surface is uniform. Therefore, the contact between the rotating shaft and the bearing surface of the bearing metal is uniform over the entire range, a lubricating area between the bearing surface of the bearing metal and the rotating shaft and a good oil film of lubricating oil can be secured, and good lubrication is achieved. Is obtained. In addition, the adhesion between the outer peripheral surface of the bearing metal and the bearing fitting surface is improved, and sliding and hitting between the bearing metal and the bearing fitting surface is suppressed, so that wear and fatigue are suppressed and the bearing metal is suppressed. This ensures a stable bearing quality for a long period of time, in combination with the securing of the axial width.

  In addition, this bearing metal is formed by bending a plate material with both sides chamfered into a semi-cylindrical shape by roll processing or pressing, and extruding one end in the width direction of the circumferential end portion from the inner peripheral side to the outer peripheral side. It can be easily manufactured by forming the positioning claw by raising.

  The invention of the bearing metal according to claim 3, which achieves the above object, comprises a bearing fitting surface having a semi-cylindrical inner surface formed on the inner circumference of the housing, and both ends extending in the circumferential direction of the bearing fitting surface. The outer peripheral surface is fitted and mounted in a rectangular plate shape having a central portion and a circumferential end portion, and a semi-cylindrical shape that rotatably supports the rotating shaft by the inner peripheral surface. In the bearing metal formed with a positioning claw that protrudes in the direction and fits into a fitting recess formed in the housing, the inner circumferential surface extends from one circumferential end to the other circumference along one side end. The bearing surface continuously extending over the end portion in the direction and between the side edge of the bearing surface and the other side end portion, so as to shift from the side edge of the bearing surface to the side end portion so as to shift to the outer peripheral surface side. It has an inclined step surface, and it is between the side edge and the side end of the bearing surface including the step surface. And characterized in that that cutting and raising a positioning pawl that protrudes from the inner circumference side to the outer circumferential side in the circumferential end portion formed.

  According to this, since the positioning claw that protrudes from the inner peripheral side to the outer peripheral side is formed at the circumferential end between the side edge and the side end of the bearing surface including the stepped surface, the bearing surface is affected by the positioning claw. The bearing surface of the bearing metal is formed by the bearing fitting surface even if there is a gap or pressure contact between the positioning claw of the bearing metal and the fitting recess. The pressure contact force with respect to the formation range of the bearing is uniform, the contact between the rotating shaft and the bearing surface of the bearing metal is uniform over the entire range, the lubrication area between the bearing surface of the bearing metal and the rotating shaft, and good lubricating oil A good oil lubrication can be obtained. In addition, the adhesion between the outer peripheral surface of the bearing metal and the bearing mating surface of the housing is improved, and sliding and hitting between the bearing metal and the bearing mating surface is suppressed, and wear and fatigue are suppressed. Stable bearing quality is maintained for a period.

  This bearing metal is formed by bending a plate material with one side edge chamfered into a semi-cylindrical shape by roll processing or pressing, and pushes one end in the width direction of the circumferential end portion from the inner peripheral side to the outer peripheral side. By forming the positioning claw by cutting and raising, it can be easily and inexpensively manufactured.

  The invention of the bearing metal according to claim 4, which achieves the above object, comprises a bearing fitting surface having an inner surface of a semi-cylindrical surface formed on the inner circumference of the housing, and both ends extending in the circumferential direction of the bearing fitting surface. The outer peripheral surface is fitted and mounted in a rectangular plate shape having a central portion and a circumferential end portion, and a semi-cylindrical shape that rotatably supports the rotating shaft by the inner peripheral surface. In the bearing metal formed with a positioning claw that protrudes in the direction and fits into a fitting recess formed in the housing, the inner circumferential surface extends from one circumferential end to the other circumference along one side end. A stepped surface that continues to the side end portion on the outer peripheral surface side from the bearing surface through a bearing surface that continues over the end in the direction and a stepped portion that bends to a side edge of the bearing surface. Projects from the inner peripheral side to the outer peripheral side at the circumferential end between the stepped portion and the side end including And characterized by forming cutting and raising a positioning pawl that.

  According to this, it protrudes from the inner peripheral side to the outer peripheral side at the circumferential end between the side edge and the side end of the bearing surface including the step surface between the side edge and the side end of the bearing surface of the bearing metal. Since the positioning claw is formed, the bearing surface is formed without being affected by the positioning claw, and a sliding area between the rotating shaft and the bearing surface is secured, and there is a gap between the positioning claw of the bearing metal and the fitting recess. Even if pressure contact occurs, the pressure contact force with respect to the bearing metal formation area of the bearing metal by the bearing fitting surface becomes uniform, the contact between the rotating shaft and the bearing surface of the bearing metal is uniform over the entire range, and the bearing metal A lubricating area between the bearing surface and the rotating shaft and a good oil screen of the lubricating oil can be secured, and good lubrication can be obtained. In addition, the adhesion between the outer peripheral surface of the bearing metal and the bearing mating surface is improved, and sliding and hitting between the bearing metal and the bearing mating surface are suppressed, so wear and fatigue are suppressed, and stable for a long period of time. Bearing quality is maintained.

  This bearing metal is formed by bending a plate material with one side edge chamfered in a step shape into a semi-cylindrical shape by roll processing or pressing, and pushes one end in the width direction of the circumferential end portion from the inner peripheral side to the outer peripheral side. By forming the positioning claw by so-called cutting and raising processing, it can be manufactured easily and inexpensively.

  According to a fifth aspect of the present invention, in the bearing metal according to any one of the first to fourth aspects, the housing is a connecting rod large end portion and a connecting rod cap of the connection rod, and the rotating shaft is a crank pin. It is characterized by.

  The present invention is applied to a housing and a rotating shaft, specifically a connecting rod and a crankpin of a crankshaft.

  According to the present invention, the bearing surface affects the positioning claw by forming the positioning claw protruding from the inner peripheral side to the outer peripheral side at the circumferential end between the side edge and the side end of the bearing surface of the bearing metal. Thus, a lubrication area between the rotating shaft and the bearing surface and a good lubricating oil can be secured, and good lubrication can be obtained. Further, the adhesion between the outer peripheral surface of the bearing metal and the bearing fitting surface is improved, and stable bearing quality is maintained for a long time.

It is a perspective view of the connecting rod with which the bearing metal which concerns on 1st Embodiment of this invention was mounted | worn. It is an exploded schematic diagram of the big end. It is a perspective view of a connecting rod big end part. It is explanatory drawing of a bearing metal, (a) is a perspective schematic diagram of a bearing metal, (b) is the sectional view on the aa line of (a). It is explanatory drawing of a bearing metal, (a) is a perspective schematic diagram of a bearing metal, (b) is the bb sectional view taken on the line of (a). It is explanatory drawing which shows the fitting state of a fitting recessed part and a positioning claw, (a) is the cc sectional view taken on the line of FIG. 1, (b) is the dd sectional view taken on the line of FIG. It is a disassembled perspective view of the connecting rod which concerns on 2nd Embodiment of this invention. It is explanatory drawing of a bearing metal, (a) is a perspective schematic diagram of a bearing metal, (b) is the ee sectional view taken on the line of (a). It is explanatory drawing of a bearing metal, (a) is a perspective schematic diagram of a bearing metal, (b) is the ff sectional view taken on the line of (a). It is explanatory drawing which shows the fitting state of a fitting recessed part and a positioning claw, (a) is the g arrow directional view of FIG. 7 in the state in which the bearing metal was mounted | worn, (b) is the figure in the state in which the bearing metal was mounted | worn. FIG. It is a disassembled perspective view of the connecting rod which concerns on 3rd Embodiment of this invention. It is explanatory drawing of a bearing metal, (a) is a perspective schematic diagram of a bearing metal, (b) is the ii sectional view taken on the line of (a). It is explanatory drawing of a bearing metal, (a) is a perspective schematic diagram of a bearing metal, (b) is the j sectional view taken on the line of (a). It is explanatory drawing which shows the fitting state of a fitting recessed part and a positioning claw, (a) is a k arrow line view of FIG. 11 in the state in which the bearing metal was mounted | worn, (b) is a figure in the state in which the bearing metal was mounted | worn. FIG. It is explanatory drawing of the conventional bearing metal, (a) is a disassembled perspective view of the big end part of a connecting rod, (b) is a perspective schematic diagram of a bearing metal. It is a perspective schematic diagram of the conventional bearing metal. It is a perspective view of the conventional bearing metal.

  An embodiment of the bearing metal according to the present invention will be described by taking a case where the housing is a large end of a connecting rod as an example.

(First embodiment)
A first embodiment will be described with reference to FIGS. 1 is a perspective view of a connecting rod to which a bearing metal is mounted, FIG. 2 is an exploded schematic view of a large end portion, FIG. 3 is a perspective view of a connecting rod large end portion, and FIGS. 4 and 5 are perspective schematic views of a bearing metal. FIG. 6 is an explanatory view showing a fitting state between the fitting recess and the positioning claw. In FIG. 6, the crank pin is indicated by a virtual line p.

  As shown schematically in FIGS. 1 and 2, the connecting rod 1 has a cylindrical connecting rod body in which a small end portion 3 to which a piston is coupled by a piston pin and a half-shaped connecting rod large end portion 5 are connected by a connecting portion. 2 and a half-divided connecting rod cap 10, and the connecting rod cap 10 is fixed to the connecting rod large end portion 5 by a fixing bolt 15, thereby providing a cylindrical housing that rotatably connects a crank pin serving as a rotating shaft. A large end 20 is constructed.

  A bearing fitting surface 6 is formed on the inner periphery of the connecting rod large end portion 5, and a bearing fitting surface 11 is formed on the inner periphery of the connecting rod cap 10. Semi-cylindrical bearing metals 21 and 31 are mounted.

  These bearing metals 21 and 31 have substantially the same shape, and the bearing metal 21 has a bearing fitting surface as shown in a perspective view in FIG. 4A and a cross-sectional view along line aa in FIG. The outer peripheral surface of the strip-shaped rectangular thin plate having a pair of side end portions 22a and 22b and circumferential end portions 23a and 23b extending in a circular arc shape extending in the circumferential direction is curved in a substantially semi-cylindrical shape. 24 and an inner peripheral surface 25.

  The inner peripheral surface 25 has a bearing surface 26 that extends from one circumferential end 23a to the other circumferential end 23b along the center in the width direction, and the bearing surfaces 26 are provided on both sides of the bearing surface 26, respectively. Stepped surfaces 27 and 28 are formed in a tapered shape that bends from the side edges 26a and 26b and is inclined so as to move to the outer peripheral surface 24 side, that is, the outer peripheral side as the side ends 22a and 22b move. The The bearing surface 26 and the step surfaces 27 and 28 are clearly divided into a bearing surface 26 that contacts the crankpin p and side surfaces 27 and 28 that are separated from the crankpin p by side edges 26a and 26b.

  Furthermore, a rectangular positioning claw 29 is formed by notching the circumferential end 23a between the side edge 26a of the bearing surface 26 and the side end 22a in the circumferential direction, bending the inner circumferential side to the outer circumferential side, and projecting to the outer circumferential side. Form. That is, a rectangular positioning claw 29 is formed by cutting the circumferential end 23a from the inner peripheral side to the outer peripheral side in the range of the stepped surface 27 formed separately from the range of the bearing surface 26 contacting the crankpin p. .

  This bearing metal 21 is formed by bending a plate material chamfered on both sides into a semi-cylindrical shape by roll processing or pressing, and extrudes one end in the width direction of the circumferential end portion from the inner peripheral side to the outer peripheral side. By forming the positioning claw by cutting and raising, it can be easily and inexpensively manufactured.

  The bearing metal 31 is a pair of semicircular arcs extending in the circumferential direction of the bearing fitting surface 11 as shown in a perspective view in FIG. 5 (a) and a cross-sectional view along line bb in FIG. 5 (b). A thin plate having side end portions 32a and 32b and circumferential end portions 33a and 33b is divided in a substantially half-cylindrical shape and has an outer peripheral surface 34 and an inner peripheral surface 35. The inner peripheral surface 35 has a width direction. A bearing surface 36 that continues from the one circumferential end 33a to the other circumferential edge 33b along the center is bent, and bent on both sides of the bearing surface 36 from the side edges 36a and 36b of the bearing surface 36, respectively. Then, stepped surfaces 37 and 38 that are chamfered in a tapered shape are formed so as to move toward the outer peripheral surface 34 side, that is, the outer peripheral side as the side end portions 32a and 32b move. The bearing surface 36 and the step surfaces 37 and 38 are clearly divided into a bearing surface 36 that abuts against the crankpin p and side surfaces 37 and 38 that are separated from the crankpin p by side edges 36a and 36b that are bent in a ridgeline shape. The

  Further, a rectangular positioning claw 39 is formed by notching the circumferential end 33a between the side edge 36b and the side end 32b of the bearing surface 36 in the circumferential direction, bending the inner circumferential side to the outer circumferential side, and projecting to the outer circumferential side. Form. That is, a rectangular positioning claw 39 is formed by cutting the circumferential end portion 33a from the inner peripheral side to the outer peripheral side in the range of the step surface 38 formed separately from the range of the bearing surface 36 that contacts the crank pin p. .

  On the other hand, the connecting rod large end portion 5 to which the bearing metal 21 is attached extends from one side edge 6a having a semicircular arc shape to the other side edge 6b continuously in the extending direction of the crank pin p as shown in FIG. A pair of bearing fitting surfaces 6 having a predetermined width in which the outer peripheral surface 24 of the bearing metal 21 is fitted in a semicircular cross section, that is, a semicylindrical inner surface, and a pair of continuous ends 6c and 6d in the circumferential direction of the bearing fitting surface 6. The fitting claw 29 of the bearing metal 21 is fitted from the circumferential end 6c to the joining surface 7 on one side edge 6a side of the bearing fitting surface 6. A concavity 9 is formed. The joint surfaces 7 and 8 are inclined with respect to the extending direction of the connecting portion, that is, the axis connecting the rotation end of the crank pin p that is the central axis of the small end portion 3 and the bearing fitting surface 6.

  The bearing metal 21 has its outer peripheral surface 24 extended along the circumferential direction of the bearing fitting surface 6 of the connecting rod large end 5 and pressed against the bearing fitting surface 6 and fitted with a positioning claw 29. The bearing metal 21 is assembled to the connecting rod large end 5 by fitting into the recess 9.

  The connecting rod cap 10 to which the bearing metal 31 is attached has a semicircular cross section extending from one side edge 11a having a semicircular arc shape to the other side edge 11b continuously in the extending direction of the crank pin as shown in FIG. A bearing fitting surface 11 having a predetermined width with which the outer peripheral surface 34 of the bearing metal 31 is fitted, and a pair of planar joining surfaces 12 and 13 continuing to the circumferential ends 11c and 11d of the bearing fitting surface 11 are provided. Then, a fitting recess 14 in which the positioning claw 39 of the bearing metal 31 is fitted from the circumferential end 11 c to the joining surface 12 is formed on the side edge 11 a side of the bearing fitting surface 11.

  Then, the outer peripheral surface 34 of the bearing metal 31 extends along the bearing fitting surface 11 of the connecting rod cap 10 and is pressed and brought into close contact with the bearing fitting surface 11, and the locking positioning claw 39 is fitted into the fitting recess 14. Then, the bearing metal 31 is assembled to the connecting rod cap 10.

  The connecting surfaces 7 and 8 of the connecting rod large end 5 and the connecting surfaces 13 and 12 of the connecting rod cap 10 are brought into contact with each other by the fixing bolt 15 so that the bearing metal 21 and the bearing metal 31 hold the crank pin p rotatably. The large end 5 and the connecting rod cap 10 are combined. That is, the large end portion 20 serving as a housing that rotatably supports the crank pin p is formed by sandwiching the pair of bearing metals 21 and 31 by the connecting rod large end portion 5 and the connecting rod cap 10. Further, the circumferential end portions 23a and 33b and 23b and 33a of the bearing metals 21 and 31 face each other, and the bearing surface 26 and the bearing surface 6 are continuously arranged. The bearing surface 26 and the bearing surface 36 make the cylindrical inner surface smooth. A continuous bearing surface is formed.

  On the small end portion 3 of the connecting rod 1, a piston accommodated in a reciprocating manner in a cylinder bore is assembled in a swingable manner. Thus, the crankshaft and the piston are connected via the connecting rod 1, and the crankshaft can be rotated by reciprocating the piston.

  The bearing metal 21 attached to the connecting rod large end 5 is attached with the outer peripheral surface 24 being in close contact with the bearing fitting surface 6 of the connecting rod large end 5. 1 is separated from the crank pin p between the side edge 26a and the side end portion 22a of the bearing surface 26 formed on the inner peripheral surface 25 as shown in FIG. 6A. Since the positioning claw 29 formed in the range of the stepped surface 27, that is, separated from the bearing surface 26 is fitted into the fitting recess 9 of the connecting rod large end 5, the bearing surface 26 affects the positioning claw 29. Thus, a sliding area between the crank pin p and the bearing surface 26 is secured, and a uniform oil film is formed by the lubricating oil. Furthermore, the range of the outer peripheral surface 24 corresponding to the entire range of the bearing surface 26 is in close contact with the bearing fitting surface 6 of the connecting rod large end 5.

  In other words, even if a clearance or a pressure contact is generated between the positioning claw 29 of the bearing metal 21 and the fitting recess 9, the pressure contact with respect to the formation range of the bearing surface 26 of the bearing metal 21 by the bearing fitting surface 6 of the connecting rod large end portion 5. The force is uniform, the contact between the crank pin p and the bearing surface 26 of the bearing metal 21 is uniform over the entire range, the deformation of the bearing surface 26 is suppressed, and the bearing surface 26 of the bearing metal 21 and the crank pin p And a good lubricating oil screen can be secured and good lubrication can be obtained.

  Further, the adhesion between the outer peripheral surface 24 of the bearing metal 21 and the bearing fitting surface 6 of the connecting rod large end portion 5 is improved, so that the sliding and hitting between the bearing metal 21 and the bearing fitting surface 6 is a so-called flex. Tighting is suppressed, wear and fatigue are suppressed, and stable bearing quality is maintained for a long time.

  On the other hand, the bearing metal 31 attached to the connecting rod cap 10 is attached so that the outer peripheral surface 34 is in close contact with the bearing fitting surface 11 of the connecting rod cap 10. In particular, as shown in FIG. 6 (b), the cross section taken along the line dd in FIG. 1 is the range of the step surface 37 formed between the side edge 36a and the side end portion 32a of the bearing surface 36, that is, from the bearing surface 36. Since the positioning claw 39 is formed so as to be separated from the fitting recess 14 of the connecting rod cap 10, the bearing surface 36 is formed without being affected by the positioning claw 39, and the sliding between the crank pin p and the bearing surface 36 is performed. A moving area is ensured and an oil film is formed by lubricating oil. Further, the range of the outer peripheral surface 34 corresponding to the entire range of the bearing surface 36 is in close contact with the bearing fitting surface 11 of the connecting rod cap 10.

  In other words, even if a clearance or pressure contact is generated between the positioning claw 39 of the bearing metal 31 and the fitting recess 14, the pressure contact force with respect to the formation range of the bearing surface 36 of the bearing metal 31 by the bearing fitting surface 11 of the connecting rod cap 10 is maintained. The contact between the crank pin p and the bearing surface 36 of the bearing metal 31 is uniform over the entire range, the deformation of the bearing surface 36 is suppressed, and the bearing surface 36 between the bearing metal 31 and the crank pin p is suppressed. In addition, an oil screen and a lubricating area of the lubricating oil can be secured, and good lubrication can be obtained. Further, the adhesion between the outer peripheral surface 34 of the bearing metal 31 and the bearing fitting surface 11 of the connecting rod cap 10 is improved, and the sliding and hitting between the bearing metal 31 and the bearing fitting surface 11 is suppressed and wear. Further, coupled with the fact that fatigue is suppressed and the axial width of the bearing metal is secured, stable bearing quality can be maintained for a long period of time.

  As described above, the bearing metal 21 and the bearing surface of the bearing metal 31 that are attached to the bearing fitting surface 6 of the connecting rod large end portion 5 and the bearing fitting surface 11 of the connecting rod cap 10 constituting the large end portion 20 of the connecting rod 1. The sliding area of the 26 and 36 with the crank pin p is ensured and the pressure contact force against the crank pin p becomes uniform, and the oil screen and the lubricating area of the lubricating oil are secured, so that good bearing quality can be obtained. Further, the adhesion between the outer peripheral surface 24 of the bearing metal 21 and the bearing fitting surface 6 of the connecting rod large end 5 is improved, and slipping and hitting between the bearing metal 21 and the bearing fitting surface 6 are suppressed. Thus, wear and fatigue are suppressed, and adhesion between the outer peripheral surface 34 of the bearing metal 31 and the bearing fitting surface 11 of the connecting rod cap 10 is improved, so that the gap between the bearing metal 31 and the bearing fitting surface 11 is improved. Slip and hit are suppressed, wear and fatigue are suppressed, and stable bearing quality is maintained for a long time.

(Second Embodiment)
A second embodiment will be described with reference to FIGS. 7 is an exploded schematic view of the large end portion of the connecting rod to which the bearing metal is mounted, FIGS. 8 and 9 are perspective schematic views of the bearing metal, and FIG. 10 is an explanatory view showing a fitting state between the fitting recess and the positioning claw. is there. In FIG. 10, the crank pin is indicated by a virtual line p. Also, in FIGS. 7 to 10, parts corresponding to those in FIGS. 1 to 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The connecting rod 1 has a connecting rod body 2 in which a small end portion and a half-shaped connecting rod large end portion 5 are connected by a connecting portion, and a connecting rod cap 10. The connecting rod cap 10 is connected to the connecting rod large end portion 5 by a fixing bolt 15. By being fixed, a large end portion 20 is formed which becomes a cylindrical housing that rotatably connects the crank pins.

  A pair of semi-cylindrical bearing metals 51 and 61 are attached to the inner peripheral surface 6 of the connecting rod large end 5 and the bearing fitting surface 11 of the connecting rod cap 10.

  The bearing metal 51 is a pair extending in an arc along the circumferential direction of the bearing fitting surface 6 as shown in a perspective view in FIG. 8A and a cross-sectional view along line ee in FIG. The outer peripheral surface 54 and the inner peripheral surface 55 are formed in a half-divided shape obtained by curving a strip-shaped rectangular thin plate having side end portions 52a and 52b and circumferential end portions 53a and 53b into a substantially semicylindrical shape.

  The inner peripheral surface 55 has a bearing surface 56 that extends from one circumferential end 53a to the other circumferential end 53b along one side end 52a, and from the side edge 56a of the bearing surface 56. A stepped surface 58 that is chamfered in a tapered shape is formed so as to bend toward the outer peripheral surface 54 side, that is, the outer peripheral side as it is bent and shifted to the side end portion 52b side. The bearing surface 56 and the step surface 58 are clearly divided into a bearing surface 56 that contacts the crank pin p and a step surface 58 that is separated from the crank pin p by a side edge 56a of the bearing surface 56 that is bent in a ridgeline shape.

  Further, a rectangular positioning claw 59 is formed by notching the circumferential end 53a between the side edge 56a and the side end 52b of the bearing surface 56 in the circumferential direction, bending the inner circumferential side to the outer circumferential side, and projecting to the outer circumferential side. Form. That is, a rectangular positioning claw 59 is formed by cutting the circumferential end 53a from the inner peripheral side to the outer peripheral side in the range of the step surface 58 formed separately from the range of the bearing surface 56 that contacts the crankpin p. .

  This bearing metal 51 is formed by bending a plate material with one side end chamfered into a semi-cylindrical shape by roll processing or pressing, and one end in the width direction of the circumferential end portion is changed from the inner peripheral side to the outer peripheral side. It can be manufactured easily and inexpensively by forming the positioning claw by so-called cutting and raising processing.

  The bearing metal 61 is shown in a perspective view in FIG. 9 (a), and as shown in a sectional view in FIG. 9 (b), semicircular arc-shaped side end portions 62a and 62b extending in the circumferential direction of the bearing fitting surface 11. And the thin plate which has the circumferential direction edge parts 63a and 63b has the outer peripheral surface 64 and the inner peripheral surface 65 by the half-divided shape curved in the substantially semicylindrical shape.

  The inner peripheral surface 65 has a bearing surface 66 that continues from the circumferential end 63a to the circumferential end edge 63b along one side end 62a, and is bent from the side edge 66a of the bearing surface 66 to the other side. A stepped surface 68 that is chamfered in a tapered shape is formed so as to be shifted to the outer peripheral surface 64 side, that is, the outer peripheral side as the end portion 62b is moved. The bearing surface 66 and the step surface 68 are partitioned by a side edge 66a of the bearing surface 66 that bends in a ridgeline shape into a bearing surface 66 that contacts the crankpin p and a step surface 68 that is separated from the crankpin p.

  Furthermore, a rectangular positioning claw 69 is formed by notching a circumferential end 63a between the side edge 66a and the side end 62b of the bearing surface 66 in the circumferential direction, bending the inner circumferential side to the outer circumferential side, and projecting to the outer circumferential side. Form. That is, a rectangular positioning claw 69 is formed by cutting the circumferential end 63a from the inner peripheral side to the outer peripheral side in the range of the step surface 68 formed separately from the range of the bearing surface 66 that contacts the crankpin p. .

  On the other hand, the connecting rod large end portion 5 to which the bearing metal 61 is attached extends from one side edge 6a having a semicircular arc shape to the other side edge 6b continuously in the extending direction of the crank pin p as shown in FIG. The bearing fitting surface 6 in which the outer peripheral surface 54 of the bearing metal 51 having a semicircular cross section, that is, a semicylindrical inner surface shape is fitted, and a pair of planar joints continuous to the circumferential ends 6c and 6d of the bearing fitting surface 6 A fitting recess 9 is formed on the side edge 6b side of the bearing fitting surface 6 where the positioning claw 59 of the bearing metal 51 is fitted from the circumferential end 6c to the joining surface 7 on the side edge 6b side of the bearing fitting surface 6. .

  And the bearing metal 51 presses the outer peripheral surface 54 against the bearing fitting surface 6 of the connecting rod large end portion 5 to be brought into intimate contact, and the positioning claw 59 is fitted into the fitting recess 9 so that the bearing metal 51 is connected to the connecting rod large end portion. 5 is assembled.

  The connecting rod cap 10 to which the bearing metal 61 is attached has a semicircular cross section extending from one side edge 11a having a semicircular arc shape to the other side edge 11b continuously in the extending direction of the crank pin as shown in FIG. A bearing fitting surface 11 to which the outer peripheral surface 64 of the bearing metal 61 is fitted, and a pair of planar joining surfaces 12 and 13 continuing to one circumferential end portion 11c and 11d of the bearing fitting surface 11 are provided. A fitting recess 14 into which the positioning claw 69 of the bearing metal 61 is fitted from the circumferential end 11 c to the joining surface 12 is formed on the side edge 11 a side of the fitting surface 11.

  Then, the outer peripheral surface 64 of the bearing metal 61 is pressed and brought into close contact with the bearing fitting surface 11 of the connecting rod cap 10, and the locking positioning claw 69 is fitted into the fitting concave portion 14 so that the bearing metal 61 is assembled to the connecting rod cap 10. . Connecting rods 7 and 8 of connecting rod large end portion 5 and connecting surfaces 13 and 12 of connecting rod cap 10 are brought into contact with each other by fixing bolt 15 so that bearing metal 51 and bearing metal 61 hold crank pin p rotatably. The large end 5 and the connecting rod cap 10 are combined. That is, the large end portion 20 serving as a housing that rotatably supports the crank pin p is formed by sandwiching the pair of bearing metals 51 and 61 by the connecting rod large end portion 5 and the connecting rod cap 10.

  The bearing metal 51 attached to the connecting rod large end 5 is attached so that the outer peripheral surface 54 is in close contact with the bearing fitting surface 6 of the connecting rod large end 5. In particular, when the bearing metal 61 is mounted, the g view in FIG. 7 is shown between the side edge 56a and the side edge 52b of the bearing surface 56 formed on the inner peripheral surface 55 as shown in FIG. 10 (a). Since the positioning claw 59 is formed in the range of the stepped surface 58 formed away from the crank pin p, that is, separated from the bearing surface 56 and the positioning claw 59 is fitted in the fitting recess 9 of the connecting rod large end portion 5, the bearing surface 56. Is formed without being affected by the positioning claw 59, and a sliding area between the crank pin p and the bearing surface 56 is secured. Further, the range of the outer peripheral surface 54 corresponding to the entire range of the bearing surface 56 is in close contact with the bearing fitting surface 6 of the connecting rod large end 5.

  In other words, even if a clearance or pressure contact is generated between the positioning claw 59 of the bearing metal 51 and the fitting recess 9, the pressure contact with respect to the formation range of the bearing surface 56 of the bearing metal 51 by the bearing fitting surface 6 of the connecting rod large end portion 5. The force is uniform, the contact between the crank pin p and the bearing surface 56 of the bearing metal 51 is uniform over the entire range, the deformation of the bearing surface 56 is suppressed, and the bearing surface 56 of the bearing metal 51 and the crank pin p During this period, the oil screen and the lubricating area of the lubricating oil can be secured, and good lubrication can be obtained. In addition, the adhesion between the outer peripheral surface 54 of the bearing metal 51 and the bearing fitting surface 6 of the connecting rod large end 5 is improved, and slipping and hitting between the bearing metal 51 and the bearing fitting surface 6 are suppressed. Thus, wear and fatigue are suppressed, and stable bearing quality is maintained for a long time.

  On the other hand, the bearing metal 61 attached to the connecting rod cap 10 is attached so that the outer peripheral surface 64 is in close contact with the inner peripheral surface 11 of the connecting rod cap 10. The range of the step surface 68 formed between the side edge 66a of the bearing surface 66 and the side end portion 62b as shown in FIG. That is, since the positioning claw 69 is formed apart from the bearing surface 66 and is fitted into the fitting recess 14 of the connecting rod cap 10, the bearing surface 66 is formed without being affected by the positioning claw 69, and the crank pin p. A sliding area with the bearing surface 66 is ensured. Furthermore, the range of the outer peripheral surface 34 corresponding to the entire range of the bearing surface 66 is in close contact with the bearing fitting surface 11 of the connecting rod cap 10.

  In other words, even if a clearance or pressure contact is generated between the positioning claw 69 of the bearing metal 61 and the fitting recess 14, the pressure contact force with respect to the formation range of the bearing surface 66 of the bearing metal 61 by the bearing fitting surface 11 of the connecting rod cap 10 is maintained. The contact between the crank pin p and the bearing surface 66 of the bearing metal 61 is uniform over the entire range, and the deformation of the bearing surface 66 is suppressed so that the bearing surface 66 between the bearing metal 61 and the crank pin p is In addition, an oil screen and a lubricating area of the lubricating oil can be secured, and good lubrication can be obtained. Further, the adhesion between the outer peripheral surface 64 of the bearing metal 61 and the bearing fitting surface 11 of the connecting rod cap 10 is improved, and the sliding and hitting between the bearing metal 61 and the bearing fitting surface 11 is suppressed and wear. In addition, fatigue is suppressed and stable bearing quality is maintained for a long time.

  As described above, the receiving surfaces 56 and 66 of the bearing metals 51 and 61 attached to the inner peripheral surface 6 of the connecting rod large end 5 and the bearing fitting surface 11 of the connecting rod cap 10 constituting the large end 20 of the connecting rod 1. The sliding contact area with the crank pin p is ensured and the pressure contact force with respect to the crank pin p is made uniform, the lubricating oil curtain and the lubricating area are secured, and good bearing quality is obtained, and the outer peripheral surface of the bearing metal 51 54 and the bearing fitting surface 6 of the connecting rod large end portion 5 are improved, and sliding and hitting between the bearing metal 51 and the inner peripheral surface 6 are suppressed, and wear and fatigue are suppressed. In addition, the adhesion between the outer peripheral surface 64 of the bearing metal 61 and the bearing fitting surface 11 of the connecting rod cap 10 is improved, and slipping and hitting between the bearing metal 61 and the bearing fitting surface 11 are suppressed, and wear and wear are suppressed. fatigue Long-term stable bearing quality is suppressed is maintained.

(Third embodiment)
A third embodiment will be described with reference to FIGS. FIG. 11 is an exploded schematic view of the large end portion of the connecting rod to which the bearing metal is mounted, FIGS. 12 and 13 are perspective schematic views of the bearing metal, and FIG. 14 is an explanatory view showing a fitting state between the fitting recess and the positioning claw. is there. In FIG. 14, the crank pin is indicated by a virtual line p. 11 to FIG. 14, the same reference numerals are given to the portions corresponding to those in FIG. 1 to FIG.

  The connecting rod 1 has a connecting rod body 2 in which a small end portion and a half-shaped connecting rod large end portion 5 are connected by a connecting portion, and a connecting rod cap 10. The connecting rod cap 10 is connected to the connecting rod large end portion 5 by a fixing bolt 15. A cylindrical large end 20 that rotatably connects the crankpin is configured by being fixed.

  A pair of halved bearing metals 71 and 81 are attached to the bearing fitting surface 6 of the connecting rod large end 5 and the bearing fitting surface 11 of the connecting rod cap 10.

  The bearing metal 71 includes a pair of side end portions 72a and 72b that are continuous in an arc shape and a circumferential end, as shown in a perspective view in FIG. 12 (a) and a cross-sectional view along line ii in FIG. 12 (b). The strip-shaped rectangular thin plate having the portions 73a and 73b is divided in a half-cylindrical shape and has an outer peripheral surface 74 and an inner peripheral surface 75.

  The inner peripheral surface 75 has a bearing surface 76 that extends from one circumferential end 73 a to the other circumferential end 73 b along one side end 72 a, and from the side edge 76 a of the bearing surface 76. A stepped portion 77 that bends in an L-shape and a stepped surface 78 that transitions from the stepped portion 75 that is on the outer peripheral surface 74 side to the side end 72b side from the bearing surface 76 is formed. The bearing surface 76 and the step surface 78 are clearly divided by a step portion 77 into a bearing surface 76 that contacts the crank pin p and a cross section 78 that is separated from the crank pin p.

  Further, a circumferential end 73a between the stepped portion 77 and the side end 72b is cut out in the circumferential direction, and a rectangular positioning claw 79 that is bent from the inner peripheral side to the outer peripheral side and protrudes to the outer peripheral side is formed. That is, a rectangular positioning claw 79 is formed by cutting the circumferential end 73a from the inner peripheral side to the outer peripheral side in the range of the stepped surface 78 formed separately from the range of the bearing surface 76 that contacts the crankpin p. .

  The bearing metal 71 is formed by curving a plate material with one side edge chamfered in a step shape into a semi-cylindrical shape by roll processing or pressing, and one end in the width direction of the circumferential end portion is changed from the inner peripheral side to the outer peripheral side. It can be manufactured easily and inexpensively by forming the positioning claw by so-called cutting and raising processing.

  The bearing metal 81 includes a pair of side end portions 82a and 82b that are continuous in an arc shape, and a circumferential end, as shown in a perspective view in FIG. 13 (a) and a cross-sectional view along line jj in FIG. 13 (b). A strip-shaped rectangular thin plate having portions 83a and 83b is divided into a half-cylindrical shape and has an outer peripheral surface 84 and an inner peripheral surface 85.

  The inner peripheral surface 85 has a bearing surface 86 that extends from one circumferential end 83 a to the other circumferential end 83 b along one side end 82 a, and from the side edge 86 a of the bearing surface 86. A stepped portion 87 that bends in an L-shape and a stepped surface 88 that transitions from the stepped portion 85 that is closer to the outer peripheral surface 84 to the side end portion 82 b than the bearing surface 86 is formed. The bearing surface 86 and the step surface 88 are clearly partitioned by a step portion 87 into a bearing surface 86 that contacts the crank pin p and a step surface 88 that is separated from the crank pin p.

  Further, a circumferential end portion 83a between the stepped portion 87 and the side end portion 82b is cut out in the circumferential direction, and a rectangular positioning claw 89 that is bent from the inner peripheral side to the outer peripheral side and protrudes to the outer peripheral side is formed. That is, a rectangular positioning claw 89 is formed by cutting the circumferential end 83a from the inner peripheral side to the outer peripheral side in the range of the step surface 88 formed separately from the range of the bearing surface 86 that contacts the crank pin p. .

  On the other hand, the connecting rod large end portion 5 to which the bearing metal 71 is mounted extends from one side edge 6a having a semicircular arc shape to the other side edge 6b continuously in the extending direction of the crankpin p as shown in FIG. The bearing fitting surface 6 into which the outer peripheral surface 74 of the bearing metal 71 having a semicircular cross section, that is, the inner surface of the semicylindrical shape is fitted, and a pair of planar joints continuous with the circumferential ends 6c and 6d of the bearing fitting surface 6 A fitting recess 9 is formed on the one side edge 6a side of the bearing fitting surface 6 where the positioning claw 79 of the bearing metal 71 is fitted from the circumferential end 6c to the joining surface 7 on the side edge 6a side. Is done.

  And the bearing metal 71 presses the outer peripheral surface 74 against the bearing fitting surface 6 of the connecting rod large end portion 5 to be in close contact with it, and the positioning claw 79 is fitted into the fitting concave portion 9 so that the bearing metal 71 is connected to the connecting rod large end portion. 5 is assembled.

  The connecting rod cap 10 to which the bearing metal 81 is attached has a semicircular cross section extending from one side edge 11a having a semicircular arc shape to the other side edge 11b continuously in the extending direction of the crankpin as shown in FIG. A bearing fitting surface 11 to which the outer peripheral surface 74 of the bearing metal 71 is fitted, and a pair of planar joining surfaces 12 and 13 continuing to one circumferential end portion 11c and 11d of the bearing fitting surface 11 are provided. A fitting recess 14 into which the positioning claw 89 of the bearing metal 81 is fitted from the circumferential end 11 c to the joining surface 12 is formed on the side edge 11 a side of the fitting surface 11.

  Then, the outer peripheral surface 84 of the bearing metal 81 is pressed and brought into close contact with the bearing fitting surface 11 of the connecting rod cap 10, and the locking positioning claw 89 is fitted into the fitting recess 14 so that the bearing metal 81 is assembled to the connecting rod cap 10.

  Then, the joint bolts 7 and 8 of the connecting rod large end portion 5 and the joint surfaces 13 and 12 of the connecting rod cap 10 are brought into contact with each other so that the bearing metal 71 and the bearing metal 81 hold the crank pin p in a rotatable manner. Thus, the connecting rod large end 5 and the connecting rod cap 10 are coupled. That is, the large end portion 20 that rotatably supports the crank pin p is formed by sandwiching the pair of bearing metals 71 and 81 by the connecting rod large end portion 5 and the connecting rod cap 10.

  The bearing metal 71 attached to the connecting rod large end portion 5 is attached so that the outer peripheral surface 74 is in close contact with the inner peripheral surface 6 of the connecting rod large end portion 5. In particular, the view in the direction of the arrow k in FIG. 11 is formed between the side edge 76a and the side end portion 72b of the bearing surface 76 formed on the inner peripheral surface 75 as shown in FIG. The positioning claw 79 is formed in a range of the stepped surface 78, that is, spaced from the bearing surface 76, and the positioning claw 79 is fitted into the fitting recess 9 of the connecting rod large end portion 5. Thus, the sliding area between the crank pin p and the bearing surface 76 is secured. Further, the range of the outer peripheral surface 74 corresponding to the entire range of the bearing surface 76 is in close contact with the inner peripheral surface 6 of the connecting rod large end 5.

  In other words, even if a gap or pressure contact is generated between the positioning claw 79 of the bearing metal 71 and the fitting recess 9, the pressure contact with respect to the formation range of the bearing surface 76 of the bearing metal 71 by the bearing fitting surface 6 of the connecting rod large end 5. The force is uniform, the contact between the crank pin p and the bearing surface 76 of the bearing metal 71 is uniform over the entire range, the deformation of the bearing surface 76 is suppressed, and the bearing surface 76 of the bearing metal 71 and the crank pin p The oil screen and lubricating area of the lubricating oil can be secured, and good lubrication can be obtained. Further, the adhesion between the outer peripheral surface 74 of the bearing metal 71 and the bearing fitting surface 6 of the connecting rod large end portion 5 is improved, and slipping and hitting between the bearing metal 71 and the bearing fitting surface 6 are suppressed. Thus, wear and fatigue are suppressed, and stable bearing quality is maintained for a long time.

  On the other hand, the bearing metal 81 attached to the connecting rod cap 10 is attached so that the outer peripheral surface 84 is in close contact with the bearing fitting surface 11 of the connecting rod cap 10. In particular, the range of the stepped surface 88 formed between the side edge 86a and the side end portion 82b of the bearing surface 86 as shown in FIG. That is, since the positioning claw 89 is formed apart from the bearing surface 86 and is fitted into the fitting recess 14 of the connecting rod cap 10, the bearing surface 86 is formed without being affected by the positioning claw 89, and the crank pin p. A sliding area with the bearing surface 86 is ensured. Further, the range of the outer peripheral surface 84 corresponding to the entire range of the bearing surface 86 is in close contact with the bearing fitting surface 11 of the connecting rod cap 10.

  In other words, even if a clearance or pressure contact is generated between the positioning claw 89 of the bearing metal 81 and the fitting recess 14, the pressure contact force with respect to the formation range of the bearing surface 86 of the bearing metal 61 by the bearing fitting surface 11 of the connecting rod cap 10 is maintained. Uniform, the contact between the crank pin p and the bearing surface 86 of the bearing metal 81 is uniform over the entire range, the deformation of the bearing surface 86 is suppressed, and the lubricating oil film and the lubrication area of the bearing metal 81 can be secured. Lubrication. Further, the adhesion between the outer peripheral surface 84 of the bearing metal 81 and the bearing fitting surface 11 of the connecting rod cap 10 is improved, and the sliding and hitting between the bearing metal 81 and the bearing fitting surface 11 is suppressed and wear. In addition, fatigue is suppressed and stable bearing quality is maintained for a long time.

  As described above, the bearing surfaces 76 of the bearing metals 71 and 81 mounted on the bearing fitting surface 6 of the connecting rod large end portion 5 and the bearing fitting surface 11 of the connecting rod cap 10 constituting the large end portion 20 of the connecting rod 1. The sliding contact area of the 86 with the crank pin p is ensured and the pressure contact force against the crank pin p is made uniform, the lubricating oil curtain and the lubricating area are secured, and good bearing quality is obtained. Adhesion between the surface 74 and the bearing fitting surface 6 of the connecting rod large end 5 is improved, and sliding and hitting between the bearing metal 71 and the bearing fitting surface 6 are suppressed, thereby suppressing wear and fatigue. In addition, the adhesion between the outer peripheral surface 84 of the bearing metal 81 and the bearing fitting surface 11 of the connecting rod cap 10 is improved, and slipping and hitting between the bearing metal 81 and the bearing fitting surface 11 are suppressed. wear Long-term stable bearing quality fine fatigue is suppressed is maintained.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above embodiment, the large end portion of the connecting rod has been described as an example, but the present invention can be applied to a journal portion of an engine that supports a journal of a crankshaft and a bearing portion having another housing.

DESCRIPTION OF SYMBOLS 1 Connecting rod 5 Connecting rod large end part 6 Bearing fitting surface 9 Fitting recessed part 10 Connecting rod cap 11 Bearing fitting surface 14 Fitting recessed part 20 Large end part (housing)
21 bearing metal 24 outer peripheral surface 25 inner peripheral surface 26 bearing surface 27 step surface 28 step surface 29 positioning claw 31 bearing metal 34 outer peripheral surface 35 inner peripheral surface 36 bearing surface 37 step surface 38 step surface 39 positioning claw 51 bearing metal 54 outer peripheral surface 55 Inner peripheral surface 56 Bearing surface 58 Step surface 59 Positioning claw 61 Bearing metal 64 Outer surface 65 Inner surface 66 Bearing surface 68 Step surface 69 Positioning claw 71 Bearing metal 74 Outer surface 75 Inner surface 76 Bearing surface 77 Step 78 Step Surface 79 Positioning claw 81 Bearing metal 84 Outer peripheral surface 85 Inner peripheral surface 86 Bearing surface 86a Side edge 87 Step portion 88 Step surface 69 Positioning claw

Claims (5)

A semi-cylindrical inner surface bearing fitting surface formed on the inner circumference of the housing is fitted with a rectangular plate shape having both sides and a circumferential end extending in the circumferential direction of the bearing fitting surface, and the outer circumferential surface is fitted. Positioning that fits in a fitting recess formed in the housing that protrudes outwardly from the outer peripheral surface to the circumferential end portion and is semi-cylindrical in which the rotating shaft is rotatably supported by the inner peripheral surface In the bearing metal where the claw is formed,
A bearing surface in which the inner peripheral surface is continuous from one circumferential end to the other circumferential end, and a step on the outer peripheral surface side from the bearing surface between a side edge and a side end of the bearing surface. And a positioning claw that protrudes from the inner peripheral side to the outer peripheral side at the circumferential end between the side edge and the side end of the bearing surface including the step surface. Bearing metal. A semi-cylindrical inner surface bearing fitting surface formed on the inner circumference of the housing is fitted with a rectangular plate shape having both sides and a circumferential end extending in the circumferential direction of the bearing fitting surface, and the outer circumferential surface is fitted. Positioning that fits in a fitting recess formed in the housing that protrudes outwardly from the outer peripheral surface to the circumferential end portion and is semi-cylindrical in which the rotating shaft is rotatably supported by the inner peripheral surface In the bearing metal where the claw is formed,
The inner peripheral surface is a bearing surface that extends from one circumferential end to the other circumferential end along the center in the width direction, and the bearing surface between both side edges of the bearing surface and each side end. A step surface that inclines so as to move to the outer peripheral surface side as it moves from the side edge to each side end portion, and a circumferential direction between the side edge of the bearing surface including the one step surface and the side end portion A bearing metal, characterized in that an end portion is formed by cutting and forming a positioning claw that protrudes from the inner peripheral side to the outer peripheral side. A semi-cylindrical inner surface bearing fitting surface formed on the inner circumference of the housing is fitted with a rectangular plate shape having both sides and a circumferential end extending in the circumferential direction of the bearing fitting surface, and the outer circumferential surface is fitted. Positioning that fits in a fitting recess formed in the housing that protrudes outwardly from the outer peripheral surface to the circumferential end portion and is semi-cylindrical in which the rotating shaft is rotatably supported by the inner peripheral surface In the bearing metal where the claw is formed,
The inner circumferential surface is continuous from one circumferential end to the other circumferential end along one side end, and between the side edge of the bearing surface and the other side end. A step surface that inclines so as to move to the outer peripheral surface side as it moves from the side edge of the bearing surface to the side end portion, and the circumference between the side edge of the bearing surface including the step surface and the side end portion; A bearing metal, characterized in that a positioning claw that projects a directional end from an inner peripheral side to an outer peripheral side is cut and raised. A semi-cylindrical inner surface bearing fitting surface formed on the inner circumference of the housing is fitted with a rectangular plate shape having both sides and a circumferential end extending in the circumferential direction of the bearing fitting surface, and the outer circumferential surface is fitted. Positioning that fits in a fitting recess formed in the housing that protrudes outwardly from the outer peripheral surface to the circumferential end portion and is semi-cylindrical in which the rotating shaft is rotatably supported by the inner peripheral surface In the bearing metal where the claw is formed,
The bearing surface through a bearing surface in which the inner circumferential surface continues from one circumferential end to the other circumferential end along one side end and a stepped portion bent to a side edge of the bearing surface. A positioning claw that has a stepped surface that is continuous to the side end portion on the outer peripheral surface side, and projects a circumferential end between the stepped portion including the stepped surface and the side end portion from the inner peripheral side to the outer peripheral side. Bearing metal characterized by being cut and raised.   The bearing metal according to any one of claims 1 to 4, wherein the housing is a connecting rod connecting rod large end and a connecting rod cap, and a rotating shaft is a crank pin.

Images