Patent application number | Description | Published |
20090169141 | CONNECTING ROD BEARING FOR INTERNAL COMBUSTION ENGINES - Disclosed is a connecting rod bearing for internal combustion engines of a forced-feed lubrication type crank shaft. A connecting rod bearing as a preferred embodiment consists of a pair of semicircular bearings. An inner surface of at least one of the semicircular bearings is provided with at least one circumferential groove which is formed on the inner surface within a maximum circumferential angle range of 45 degrees, measured from one circumferential end facing the same direction as a rotational direction of the crankpin toward a circumferential center region of the semicircular bearing, each of the semicircular bearings having two circumferential ends which are of butt ends brought into contact with those of a mating semicircular bearing. In an assembled state of the semicircular bearings such that the butt ends thereof are brought into butt-contact with one another between the mating semicircular bearings, an axial groove is formed on an inner surface of at least one of the semicircular bearings so as to extend along the butt end throughout a full length between both axial ends of the semicircular bearing, whereby the axial groove, as a lubricant-oil flow channel, is connected with the circumferential groove. | 07-02-2009 |
20090257695 | SLIDING BEARING FOR INTERNAL COMBUSTION ENGINES - Disclosed is a sliding bearing consisting of a pair of semi-cylindrical bearings assembled with each other so as to form a cylindrical configuration. At least one of the semi-cylindrical bearings is provided with a circumferentially extending oil groove on an inner surface thereof. The oil groove includes a central portion of a circumferential length of the semi-cylindrical bearing. A bottom surface of the oil groove has an ups and downs form consisting of a plurality of ridges and a plurality of roots, which undulate consecutively without a flat portion. The dimensional relationship between an optional ridge out of the plurality of ridges and the roots positioned adjacent to the optional root is defined by the formula h<0.15H where H indicates a groove depth defined by the inner surface of the semi-cylindrical bearing, namely a bearing sliding surface, and a depth of the roots, and h indicates an elevation difference of the ups and downs of the bottom surface, namely a height of the ridges. The height h of the ridges is preferably not less than 10 μm. | 10-15-2009 |
20100119181 | SLIDING BEARING FOR INTERNAL COMBUSTION ENGINE AND SLIDING BEARING DEVICE - Disclosed is a sliding bearing consisting of a pair of semi-cylindrical bearings for supporting a crankshaft or a crank pin in an internal combustion engine. The sliding bearing is incorporated in a split-type bearing housing. One of the semi-cylindrical bearings being incorporated in at least one of the pair of housing halves, which one housing half has a relatively higher stiffness, is provided with a number of circumferential grooves on an inner surface of the semi-cylindrical bearing so as to extend circumferentially along the inner surface of the semi-cylindrical bearing. The circumferential grooves existing at least one circumferential end region of the inner surface of the semi-cylindrical bearing have a depth of not less than 10 μm, the circumferential end region including a circumferential bearing end face orientating a direction opposite to the rotation direction of the shaft or pin. | 05-13-2010 |
20100166349 | SPLIT-TYPE SLIDING BEARING FOR A CRANKSHAFT IN INTERNAL COMBUSTION ENGINE AND SPLIT-TYPE SLIDING DEVICE - The invention provides a split-type sliding bearing for a crankshaft in an internal combustion engine. | 07-01-2010 |
20100166350 | SPLIT-TYPE SLIDING BEARING FOR CRANKSHAFT IN INTERNAL COMBUSTION ENGINE AND SPLIT-TYPE SLIDING BEARING DEVICE - A split-type sliding bearing, for a crankshaft in an internal combustion engine, is comprised of a pair of semi-cylindrical bearings which are fitted between a pair of housing halves having respectively high and low thermal expansion coefficients and constituting a split-type bearing housing, one of the pair of semi-cylindrical bearings being supported on the housing half having a low thermal expansion coefficient, and the other one of the pair of semi-cylindrical bearings being supported on the housing have having a high thermal expansion coefficient. The circumferential end zones of the semi-cylindrical bearing supported on the housing half having a high thermal expansion coefficient have a thickness which is set to be greater than that of the circumferential end zones of the semi-cylindrical supported on the housing half having a low thermal expansion coefficient. The split-type sliding bearing can solve the problem of occurrence of a stepped difference which is caused at the inner surface of the bearing between the abutting end faces of the pair of semi-cylindrical bearings when the temperature of the split-type bearing housing is increased during operation of the internal combustion. | 07-01-2010 |
20100166351 | SPLIT-TYPE SLIDING BEARING FOR CRANKSHAFT IN INTERNAL COMBUSTION ENGINE AND SPLIT-TYPE SLIDING BEARING DEVICE - Disclosed is a split-type sliding bearing for a crankshaft in an internal combustion engine, which is incorporated in a split-type bearing housing. The sliding bearing consists of a pair of semi-cylindrical bearing bodies (i.e. a first and a second semi-cylindrical bearing bodies) which are combined with each other to form a cylindrical body. The bearing housing has a cylindrical bearing retaining bore and consists of a pair of housing halves. One of the housing halves has a relatively lower stiffness, and the other has a relatively higher stiffness. The first bearing body is held by the housing half having a relatively lower stiffness. The second bearing body is held by the housing half having a relatively higher stiffness. The first and second bearing bodies have an equal outer diameter to each other, and both of the circumferential end parts of the first bearing body have a larger thickness than those of the second bearing body prior to incorporation into the housing halves. | 07-01-2010 |
20100220945 | CONNECTING ROD BEARING IN INTERNAL COMBUSTION ENGINE - Disclosed is a connecting rod bearing for an internal combustion engine. At least one of the semi-cylindrical bearings is provided with a circumferential groove on an inner surface of the one semi-cylindrical bearing, which circumferential groove extends from at least one of two abutting ends with respect to the other semi-cylindrical bearing toward a circumferential center part of the one semi-cylindrical bearing, and is in alignment with an outlet port of a lubricant oil passage, the at least one abutting end being oriented toward the same direction as a direction of relative rotation of the crankpin with respect to the connecting rod bearing. The at least one abutting end is oriented toward the same direction as a direction of relative rotation of the crankpin with respect to the connecting rod bearing. | 09-02-2010 |
20100316312 | SLIDING BEARING FOR INTERNAL COMBUSTION ENGINE - Disclosed is a sliding bearing for an internal combustion engine which is used as a cylindrical bearing by combining a pair of semi-cylindrical bearings. An axial groove A exists between the circumferential end surface and an opposite circumferential end surface. A circumferential oil groove and the axial groove A communicate with each other, depths of the circumferential oil groove in the communication portion and the axial groove A in the circumferential end surfaces differ from each other, and a groove bottom of the circumferential oil groove is located at a position displaced to a side of the inner circumferential bearing surface from the groove bottom of the axial groove A. A cross-sectional area of the circumferential oil groove in the communication portion is larger than a cross-sectional area of the axial groove A. | 12-16-2010 |
20100316313 | CONNECTING ROD BEARING FOR INTERNAL COMBUSTION ENGINES AND CONNECTING ROD BEARING DEVICE - Disclosed is a connecting rod bearing for crankshafts having a pair of semi-cylindrical bearings. Circumferential grooves (CG) on the bearing inner surface extend from each circumferential end toward the circumferential center within a maximum circumferential angle of 45 degrees and divide reduced wall thickness region into two sections. Axial grooves communicating with the CG are provided along abutted ends of the bearings. Circumferential length of the CG is larger than that of the reduced region. Depth of the CG becomes gradually smaller from the end toward the center. Width of the CG is not smaller than one-quarter of a diameter of lubricant-oil outlet of internal lubricant-oil passage in a crankpin and less than the diameter. Cross-sectional area of the CG is larger than that of the axial grooves at a connection portion thereof. | 12-16-2010 |
20110058761 | SLIDING BEARING FOR INTERNAL COMBUSTION ENGINE - Disclosed is a sliding bearing for an internal combustion engine for supporting a crankshaft including a pair of semi-cylindrical bearings combined with each other into a cylindrical body. Each of inner circumferential surfaces of the respective semi-cylindrical bearings includes first and second curved surfaces following two kinds of arcs with different curvatures. The first curved surface is in a region including a circumferential central portion of the inner circumferential surface. The second curved surfaces are in remaining two regions of the inner circumferential surface. The circumferential oil groove and the axial groove communicate with each other. The circumferential grooves of the second curved surfaces and the axial groove communicate with each other. The groove bottoms of the circumferential grooves of the second curved surfaces are displaced to a side of the bearing inner circumferential surface from a groove bottom of the axial groove. | 03-10-2011 |
20110058762 | BEARING FOR CONNECTING ROD OF INTERNAL COMBUSTION ENGINE - A connecting rod bearing is constituted of a pair of semi-cylindrical bearings I and II. In a state in which the semi-cylindrical bearings are assembled into a cylindrical shape, along two contact surfaces C of circumferential end surfaces, first axial oil grooves E are formed to be located at a central portion in a bearing width direction, and second axial oil grooves F are formed to be located at both sides in the bearing width direction of each of the first axial oil grooves E. One of the first axial oil grooves E and two of the second axial oil grooves F are in relation to communicate with each other. The first axial oil groove E is formed in the range of the wall thickness decreasing region surface A. | 03-10-2011 |
20110243486 | SLIDING BEARING FOR INTERNAL COMBUSTION ENGINES - Disclosed is a sliding bearing for supporting a crankshaft journal portion of an internal combustion engine. One of the semi-cylindrical bearings is provided with a circumferential oil groove on its inner circumferential surface, and has two circumferential ends. The circumferential oil groove has an open groove end at at least one of the two circumferential ends, which one is a first circumferential end being directed to the same direction as a relative rotational direction of a crankshaft. The other semi-cylindrical bearing is provided with at least one circumferential local groove on its inner circumferential surface, and has two circumferential ends. The circumferential local groove has an open groove end at one of the two circumferential ends, which one is a second circumferential end being directed to the opposite direction to the relative rotational direction of the crankshaft. The circumferential oil groove and the local circumferential groove are in fluid communication with each other. At a region of the fluid communication, a groove bottom of the local circumferential groove is deviated toward an axis of the sliding bearing from another groove bottom of the circumferential oil groove. An axial groove is formed along a contact interface between the first and second circumferential ends. | 10-06-2011 |
20130064486 | CONNECTING ROD BEARING OF INTERNAL COMBUSTION ENGINE - Disclosed is a connecting rod bearing for a crankshaft of an internal combustion engine, the connecting rod bearing comprising a pair of semi-cylindrical bearings. In at least one of the semi-cylindrical bearings, a front side circumferential groove is formed from the front side circumferential end surface, and in the opposed semi-cylindrical bearing, a rear side circumferential groove is formed from the rear side circumferential end surface. In a communicating portion where the front side circumferential groove, the rear side circumferential groove, and the axial groove communicate with one another, a depth of the front side circumferential groove is larger than a depth of the rear side circumferential groove, whereby a step portion in a depth direction of the circumferential grooves is formed. | 03-14-2013 |
20130064487 | CONNECTING ROD BEARING OF INTERNAL COMBUSTION ENGINE - Disclosed is a connecting rod bearing for a crankshaft of an internal combustion engine, the connecting rod bearing comprising a pair of semi-cylindrical bearings. In at least one of the semi-cylindrical bearings, a front side circumferential groove is formed from the front side circumferential end surface, and in the opposed semi-cylindrical bearing, a rear side circumferential groove is formed from the rear side circumferential end surface. A circumferential length of the front side circumferential groove is larger than a circumferential length of the front side crush relief, and a circumferential length of the rear side circumferential groove is smaller than a circumferential length of the rear side crush relief. | 03-14-2013 |
20130156358 | MAIN BEARING FOR CRANKSHAFT OF INTERNAL COMBUSTION ENGINE - A main bearing for a crankshaft of an internal combustion engine comprises a pair of semi-cylindrical bearings. An oil groove extends on an inner circumferential surface of one semi-cylindrical bearing in a circumferential direction so that the center thereof in an axial direction aligns with that of an inlet opening of a lubricating oil path in a journal section of the crankshaft. The oil groove does not extend up to an axial direction groove formed at a joint portion of the semi-cylindrical bearings so that a separation inner circumferential surface extends between a circumferential direction end portion of the oil groove and the axial direction groove. The length of the separation inner circumferential surface is smaller than that of the inlet opening in the circumferential direction. | 06-20-2013 |
20130182981 | MAIN BEARING FOR CRANKSHAFT OF INTERNAL COMBUSTION ENGINE - A main bearing for a crankshaft of an internal combustion engine is composed of a pair of semi-cylindrical bearings. An oil groove extending in a circumferential direction is formed on an inner circumferential surface of one semi-cylindrical bearing. The oil groove has the depth gradually decreasing toward a circumferential end surface of the one semi-cylindrical bearing, and defines a circumferential end portion on the circumferential surface without extending to an axial groove formed in a joint portion of the pair of semi-cylindrical bearings. An extension portion of the inner circumferential surface extends between the circumferential end portion and the axial groove, and a plurality of circumferential grooves extending in the circumferential direction is formed on the extension portion from the oil groove to the axial groove over an entire width of the circumferential end portion of the oil groove. | 07-18-2013 |
20130209014 | SPLIT-TYPE SLIDING BEARING FOR CRANKSHAFT IN INTERNAL COMBUSTION ENGINE AND SPLIT-TYPE SLIDING BEARING DEVICE - A split-type sliding bearing for a crankshaft in an internal combustion engine incorporated in a split-type bearing housing. The sliding bearing consists of a pair of semi-cylindrical bearing bodies combined with each other to form a cylindrical body. The bearing housing has a cylindrical bearing retaining bore and consists of a pair of housing halves. One of the housing halves has a relatively lower stiffness, and the other has a relatively higher stiffness. One of the bearing bodies is held by the housing half having a relatively lower stiffness. The other bearing body is held by the housing half having a relatively higher stiffness. The bearing bodies have an equal outer diameter to each other, and both of the circumferential end parts of one bearing body have a larger thickness than those of the other bearing body prior to incorporation into the housing halves. | 08-15-2013 |
20130223776 | PLAIN BEARING AND BEARING DEVICE - A plain bearing for supporting a crank shaft of an internal combustion engine is provided. The plain bearing is constituted by a pair of semicylindrical members. A crush relief is formed in an inner circumferential surface of the semicylindrical member, and a main cylindrical surface is formed in a region aside from the crush relief. The crush relief includes an outwardly convex curved surface and an inwardly convex curved surface. | 08-29-2013 |
20130251293 | HALF BEARING AND PLAIN BEARING - A half bearing for supporting a crank shaft of an internal combustion engine is provided. The half bearing having a main semi-cylindrical part, two crush reliefs, and two transition regions. Each crush relief has a depth from a imaginary plane at a circumferential end surface of the half bearing greater than a depth from the imaginary plane at a connecting position between each crush relief and the transition region. A plurality of circumferential grooves extend in a circumferential direction in the main semi-cylindrical part along their entire length in the circumferential direction, and the plurality of circumferential grooves extend also in the transition region continuously. | 09-26-2013 |
20130251294 | BEARING APPARATUS FOR CRANKSHAFT OF INTERNAL COMBUSTION ENGINE - A bearing apparatus for a crankshaft of an internal combustion engine having a main bearing and a connecting rod bearing is provided. The main bearing comprises a pair of semi-cylindrical bearings, only one of which has an oil groove extending in a circumferential direction on an inner circumferential surface thereof. The oil groove is separated from an axial groove formed at a joint portion of the semi-cylindrical bearings by a separation inner circumferential surface of which a length L | 09-26-2013 |