Abstract: The vibration of a cab deck as well as the mass of a deck supporting member is suppressed. A slewing frame of an upper slewing body includes a front plate connected to a second side plate. A cab deck is disposed on a front side of an engine deck with a gap between the cab deck and the engine deck. A deck supporting member is connected to the second side plate and the cab deck. When viewed along an up-and-down direction, a connection portion of the front plate to be connected to the second side plate is opposed to, in the lateral direction via the second side plate, a connection portion of the deck supporting member to be connected to the second side plate.

Abstract: The vibration of a cab deck as well as the mass of a deck supporting member is suppressed. A slewing frame 10 of an upper slewing body 1 includes a front plate 17 connected to a second side plate 15B. A cab deck 30 is disposed on a front side X1 of an engine deck 20 with a gap S between the cab deck 30 and the engine deck 20. A deck supporting member 40 is connected to the second side plate 15B and the cab deck 30. When viewed along an up-and-down direction Z, a connection portion of the front plate 17 to be connected to the second side plate 15B is opposed to, in the lateral direction Y via the second side plate 15B, a connection portion of the deck supporting member 40 to be connected to the second side plate 15B.

Abstract: A cabin support deck for supporting a cabin of a construction machine on the underside of the cabin includes a frame member and a mounting portion. The frame member includes a proximal segment at which the frame member is supported, a distal segment, a left side segment, and a right side segment. The distal segment has a first structure having a first lateral dimension. The proximal segment has a second structure having a second lateral dimension which is greater than the first lateral dimension. At least one of the proximal side sections of the left side segment and the right side segment has the second structure, and the other portions of the left side segment and the right side segment have the first structure.

Abstract: A cabin support deck for supporting a cabin of a construction machine on the underside of the cabin includes a frame member and a mounting portion. The frame member includes a proximal segment at which the frame member is supported, a distal segment, a left side segment, and a right side segment. The distal segment has a first structure having a first lateral dimension. The proximal segment has a second structure having a second lateral dimension which is greater than the first lateral dimension. At least one of the proximal side sections of the left side segment and the right side segment has the second structure, and the other portions of the left side segment and the right side segment have the first structure.

Abstract: A turbocharger includes a turbine wheel having a center hole and a turbine shaft having one end secured on a small-diameter inner circumferential surface of the center hole. A large-diameter inner circumferential surface and a large diameter outer circumferential surface are formed to provide a cylindrical clearance opening toward a bearing housing between the center hole and the outer circumferential surface of the turbine shaft.

Abstract: A supercharger includes a housing, and a turbine shaft supported in a center hole in the housing through rolling bearings. Lubricating oil for the rolling bearings exists only within the housing. A cooling water jacket is provided within a body portion of the housing over a region from one axial end portion of the body portion to the other axial end portion thereof.

Abstract: A turbocharger includes a housing, and a turbine shaft supported in a center hole in the housing through rolling bearings. A tank portion for storing lubrication oil is formed in the housing, and the lubricating oil is supplied from the tank portion to the rolling bearings through wick members extending from the tank portion respectively to the rolling bearings. The wick member includes a bundle of fibers made of a plastics material, and a distal end portion thereof is separated into a fibrous condition, and this distal end portion is held in contact with the bearing. The lubricating oil is supplied to the bearing by a capillary action of the wick member.

Abstract: The invention is aimed, in a rolling bearing device, to improve its durability by appropriately attenuating vibration of a rotating shaft by means of a high level of dumping performance, and thereby to reduce the load imposed on the rolling bearing and/or the overall system. A rolling bearing device of the present invention comprises a rolling bearing (13) including: an inner ring (24) and an outer ring (23) that are disposed so as to be relatively rotatable; and a plurality of rolling elements (25) disposed between the inner ring (24) and the outer ring (23), in which the rolling bearing (13) supports relative rotation between a shaft (14) and a housing (12). Besides, the rolling bearing device comprises, between the rolling bearing (13) and the housing (12), a damper member (60) formed by one or more metal wires (64) that are knitted.

Abstract: A sealing structure includes a labyrinth seal provided between a housing and an outer periphery of an end portion of a turbine shaft on a turbine wheel side, and a piston ring seal disposed on a side toward a center of the turbine shaft in an axial direction thereof from a position on the turbine shaft at which the labyrinth seal is provided, and a ring groove is formed along a circumferential direction of the housing in a middle portion of the labyrinth seal to reverse a flow direction of exhaust gas entering from the exhaust passage.

Abstract: A supercharger includes a housing, and a turbine shaft supported in a center hole in the housing through rolling bearings. Lubricating oil for the rolling bearings exists only within the housing. A cooling water jacket is provided within a body portion of the housing over a region from one axial end portion of the body portion to the other axial end portion thereof.

Abstract: A rolling bearing device includes a bearing housing supported on a casing of a turbocharger, and a pair of rolling bearings mounted within the bearing housing and rotatably supporting a turbine shaft. A middle position between the pair of rolling bearings in an axial direction and a central portion of the bearing housing in the axial direction are offset from each other in the axial direction. Each of the rolling bearings includes an inner ring, an outer ring, an intermediate ring interposed between the inner and outer rings, a row of rolling elements rollably interposed between the inner ring and the intermediate ring, and a row of rolling elements rollably interposed between the intermediate ring and the outer ring. The intermediate ring has a damper function to be very slightly displaced or very slightly deformed elastically so as to damp vibration produced during rotation of the turbine shaft.

Abstract: A turbocharger includes a housing, and a turbine shaft supported in a center hole in the housing through rolling bearings. A tank portion for storing lubrication oil is formed in the housing, and the lubricating oil is supplied from the tank portion to the rolling bearings through wick members extending from the tank portion respectively to the rolling bearings. The wick member includes a bundle of fibers made of a plastics material, and a distal end portion thereof is separated into a fibrous condition, and this distal end portion is held in contact with the bearing. The lubricating oil is supplied to the bearing by a capillary action of the wick member.

Abstract: There are provided an inner ring having a first raceway at an outer periphery thereof, an outer ring having a second raceway at an inner periphery thereof, an intermediate ring which is interposed between these, and has a third raceway at an inner periphery thereof and also has a fourth raceway at an outer periphery thereof, first rolling elements interposed between the first raceway and the third raceway, and second rolling elements interposed between the fourth raceway and the second raceway. The intermediate ring includes a larger-diameter ring portion, and a smaller-diameter ring portion formed on the larger-diameter ring portion through an inclined ring portion. The third raceway is formed at a boundary portion between the larger-diameter ring portion and the inclined ring portion, and the fourth raceway is formed at a boundary portion between the smaller-diameter ring portion and the inclined ring portion.

Abstract: A supercharger includes a housing and a turbine shaft supported by the center hole within the housing through rolling bearings. A cooling water jacket within the housing is provided within the main body portion of the housing. The rolling bearings are supplied with lubricant by a tank portion formed within the housing for reserving the lubricant and a wick member provided between the tank portion and the center hole. The wick member 36 includes a core portion configured by a fiber portion and gaps. The lubricant is supplied by the capillary action of the gaps. The porosity of the gap is set to be 45.5% or more and less than 80%.

Abstract: A turbine shaft to which a turbine is fixed is supported by a bearing supporting member via bearings so as to rotate freely. The bearing supporting member is supported by a housing via the damper member. The damper member is formed by knitting a wire made of metal.

Abstract: A turbocharger includes a turbine wheel having a center hole and a turbine shaft having one end secured on a small-diameter inner circumferential surface of the center hole. A large-diameter inner circumferential surface and a large diameter outer circumferential surface are formed to provide a cylindrical clearance opening toward a bearing housing between the center hole and the outer circumferential surface of the turbine shaft.

Abstract: A ball bearing with double raceway rotatably supports a pinion shaft having a pinion gear on its one end. This ball bearing with double raceway is provided with: an outer ring member having a large-diameter raceway surface and a small-diameter raceway surface; an inner ring member having a large-diameter raceway surface and a small-diameter raceway surface that correspond to the large-diameter raceway surface and the small-diameter raceway surface of the outer ring member; a large-diameter-side row of balls that are interpolated between the two large-diameter raceway surfaces; a small-diameter-side row of balls that are interpolated between the two small-diameter raceway surfaces; a large-diameter-side cage that holds the large-diameter-side row of balls; and a small-diameter-side cage that holds the small-diameter-side row of balls.

Abstract: A ball bearing with double raceway rotatably supports a pinion shaft having a pinion gear on its one end. This ball bearing with double raceway is provided with: an outer ring member having a large-diameter raceway surface and a small-diameter raceway surface; an inner ring member having a large-diameter raceway surface and a small-diameter raceway surface that correspond to the large-diameter raceway surface and the small-diameter raceway surface of the outer ring member; a large-diameter-side row of balls that are interpolated between the two large-diameter raceway surfaces; a small-diameter-side row of balls that are interpolated between the two small-diameter raceway surfaces; a large-diameter-side cage that holds the large-diameter-side row of balls; and a small-diameter-side cage that holds the small-diameter-side row of balls.

Abstract: First and second annular clearances are formed between an outer peripheral surface of an annular portion of a cage and an inner peripheral surface of an annular piece of a first outer ring member, and between an inner peripheral surface of a baffle piece and an outer peripheral surface of a shoulder portion of a first inner ring member, respectively, and these radial widths are set to be larger than 0 and 0.15 times or less of a diameter of a ball, respectively.