Abstract: There is provided a slide bearing capable of preventing or reducing a temperature increase in lubricant. A cylindrical main bearing is formed by combining a pair of upper bearing and lower bearing and rotatably supports a crank journal. The lower bearing includes a downstream crush relief formed at a downstream end in the rotation direction of the crank journal in an inner periphery of the lower bearing; and an oil groove formed in the inner periphery of the lower bearing so as to communicate with the downstream crush relief.

Abstract: There is provided a slide bearing capable of preventing or reducing a temperature increase in lubricant. A cylindrical main bearing is formed by combining a pair of upper bearing and lower bearing and rotatably supports a crank journal. The lower bearing includes a downstream crush relief formed at a downstream end in the rotation direction of the crank journal in an inner periphery of the lower bearing; and an oil groove formed in the inner periphery of the lower bearing so as to communicate with the downstream crush relief.

Abstract: There is provided an oil feed member capable of preventing lubricant from being excessively fed from an oil feed member to lubrication portions of valve gears, and a lubricant feed mechanism for an engine provided with the same. An oil feed member for feeding lubricant to lubrication portions of valve gears for opening and closing intake valves and exhaust valves of an engine, the oil feed member including: an upper panel member and a lower panel member laid over each other; and an oil feed passage formed by recessing laid surfaces of the upper panel member and the lower panel member, wherein the oil feed passage includes basis oil passages formed on a downstream side, and an introduction oil passage formed on an upstream side and having a smaller lubricant flow area than that of the basis oil passages.

Abstract: Provided are an oil feed member that makes it possible to ensure a wide distance between oil passages and to achieve space saving in the oil passages and a lubricant feed mechanism of an engine provided with the oil feed member. An oil feed member includes a lubricant passage and a plurality of discharge ports that are formed on the downstream end of the lubricant passage and discharge lubricant flowing through the lubricant passage to a lubrication portion. The lubricant passage includes a basis oil passage, a first upstream branch oil passage that branches off from the basis oil passage and allows lubricant guided to the discharge ports to flow therethrough, and a second upstream branch oil passage that branches off from the basis oil passage and allows lubricant guided to the discharge ports to flow therethrough.

Abstract: There is provided an oil feed member capable of preventing lubricant from being excessively fed from an oil feed member to lubrication portions of valve gears, and a lubricant feed mechanism for an engine provided with the same. An oil feed member for feeding lubricant to lubrication portions of valve gears for opening and closing intake valves and exhaust valves of an engine, the oil feed member including: an upper panel member and a lower panel member laid over each other; and an oil feed passage formed by recessing laid surfaces of the upper panel member and the lower panel member, wherein the oil feed passage includes basis oil passages formed on a downstream side, and an introduction oil passage formed on an upstream side and having a smaller lubricant flow area than that of the basis oil passages.

Abstract: There is provided a slide bearing capable of preventing or reducing a temperature increase in lubricant. A cylindrical main bearing is formed by combining a pair of upper bearing and lower bearing and rotatably supports a crank journal. The lower bearing includes a downstream crush relief formed at a downstream end in the rotation direction of the crank journal in an inner periphery of the lower bearing; and an oil groove formed in the inner periphery of the lower bearing so as to communicate with the downstream crush relief.

Abstract: There is provided a slide bearing capable of preventing or reducing a temperature increase in lubricant. A cylindrical main bearing is formed by combining a pair of upper bearing and lower bearing and rotatably supports a crank journal. The lower bearing includes a downstream crush relief formed at a downstream end in the rotation direction of the crank journal in an inner periphery of the lower bearing; and an oil groove formed in the inner periphery of the lower bearing so as to communicate with the downstream crush relief.

Abstract: To provide a bearing member for a valve gear capable of reducing friction. A bearing member (34) for a valve gear (1) includes a cam shaft (20). The cam shaft (20) has: a cam (30) for opening/closing at least one of an intake valve and an exhaust valve; and a plurality of journal parts (36). The bearing member (34) includes: a cam cap (38) supporting the journal part (36) from above, surrounding it; a bearing base part (40) supporting the journal part (36) from below; and a stepped part (46a) provided on an inner peripheral surface of the cam cap (38) facing the journal part (36), overhanging on an inner peripheral side of the inner peripheral surface. An upstream-side end portion (46c) of the stepped part (46a) is positioned more on a downstream side than an upstream-side abutting surface (38a) of the cam cap (38), whereas a downstream-side end portion (46d) of the stepped part (46a) is positioned more on an upstream side than a downstream-side abutting surface (38b) of the cam cap (38).

Abstract: To provide a bearing member for a valve gear capable of reducing friction. A bearing member (34) for a valve gear (1) includes a cam shaft (20). The cam shaft (20) has: a cam (30) for opening/closing at least one of an intake valve and an exhaust valve; and a plurality of journal parts (36). The bearing member (34) includes: a cam cap (38) supporting the journal part (36) from above, surrounding it; a bearing base part (40) supporting the journal part (36) from below; and a stepped part (46a) provided on an inner peripheral surface of the cam cap (38) facing the journal part (36), overhanging on an inner peripheral side of the inner peripheral surface. An upstream-side end portion (46c) of the stepped part (46a) is positioned more on a downstream side than an upstream-side abutting surface (38a) of the cam cap (38), whereas a downstream-side end portion (46d) of the stepped part (46a) is positioned more on an upstream side than a downstream-side abutting surface (38b) of the cam cap (38).