Abstract: A mulching machine comprising a machine body that includes a tilling unit performing tilling, a ridge forming unit forming a ridge with the tilled soil, a mulch film laying unit drawing a mulch film from a film roll and laying it over the ridge, and ground wheels supporting the machine body. The tilling unit and the ridge forming unit are arranged in this order from the front in the traveling direction of the mulching machine, and the film roll is positioned such that its center of gravity does not overlap the ground wheels and is located forward of the ground wheels in the traveling direction.

Abstract: A planet gear support shaft includes a cylindrical body that is open at both ends in a central axis direction. The cylindrical body has an inlet port through which lubricating oil is introduced into a hollow portion of the cylindrical body, and a discharge port through which the lubricating oil introduced into the hollow portion is discharged, the inlet port and the discharge port being open to an inner peripheral surface of the hollow portion at different positions in the central axis direction. An oil guide groove is provided between a first opening of the inlet port and a second opening of the discharge port in the inner peripheral surface. The oil guide groove is configured to guide the lubricating oil between the first opening and the second opening.

Abstract: A planetary gear support shaft is provided in a shaft hole of a planetary gear to support the planetary gear. The planetary gear is disposed between an internal gear and an external gear supported coaxially so as to be rotatable relative to each other. The planetary gear support shaft includes a body made of a tubular steel pipe with two open ends, and a pair of lid bodies that block opening portions at the two ends of the body. The body has an in-flow hole that allows lubricating oil to flow into a hollow portion between the pair of lid bodies and an out-flow hole through which the lubricating oil is supplied from the hollow portion into the shaft hole.

Abstract: A mulching machine comprising a machine body that includes a tilling unit performing tilling, a ridge forming unit forming a ridge with the tilled soil, a mulch film laying unit drawing a mulch film from a film roll and laying it over the ridge, and ground wheels supporting the machine body. The tilling unit and the ridge forming unit are arranged in this order from the front in the traveling direction of the mulching machine, and the film roll is positioned such that its center of gravity does not overlap the ground wheels and is located forward of the ground wheels in the traveling direction.

Abstract: A seat support structure for a working vehicle comprises a fixed plate, a parallel link mechanism, a supporting plate, a rotation shaft, a rotation plate, a seat, a rear upper shaft, and a rotation lock unit. The fixed plate is fixed on a vehicle body of the vehicle. The parallel link mechanism includes a front link and a rear link. The supporting plate is connected to the fixed plate via the parallel link mechanism. The rotation shaft is fixed on a center portion of the supporting plate. The rotation plate is rotatably supported on the rotation shaft. The seat is attached to the rotation plate. The rear upper shaft connects the rear link to the supporting plate. The rotation lock unit is provided on the rear upper shaft.

Abstract: For providing a supporting structure for the excavator changes the fitting height of the backhoe, This invention provides a supporting structure of excavator for attaching the backhoe with variable height which comprising: an attachment mount fixed to a frame, and an adjuster plate fixed to the attachment mount, wherein the backhoe is mounted to an appropriate position of the adjuster plate.

Abstract: A seat support structure for a working vehicle comprises a fixed plate, a parallel link mechanism, a supporting plate, a rotation shaft, a rotation plate, a seat, a rear upper shaft, and a rotation lock unit. The fixed plate is fixed on a vehicle body of the vehicle. The parallel link mechanism includes a front link and a rear link. The supporting plate is connected to the fixed plate via the parallel link mechanism. The rotation shaft is fixed on a center portion of the supporting plate. The rotation plate is rotatably supported on the rotation shaft. The seat is attached to the rotation plate. The rear upper shaft connects the rear link to the supporting plate. The rotation lock unit is provided on the rear upper shaft.

Abstract: For providing a supporting structure for the excavator changes the fitting height of the backhoe, This invention provides a supporting structure of excavator for attaching the backhoe with variable height which comprising: an attachment mount fixed to a frame, and an adjuster plate fixed to the attachment mount, wherein the backhoe is mounted to an appropriate position of the adjuster plate.

Abstract: A cage of a thrust roller bearing includes: a pair of crank-shaped bent portions arranged in a circumferential direction of the cage; a pair of inner wall surfaces arranged in a radial direction of the cage; and a pocket for housing a roller defined by the pair of bent portions and the pair of inner wall surfaces and formed by punching the cage. Radially inner one of the inner wall surfaces is formed as a guiding surface for guiding a substantial roller PCD position of an end surface of the roller. Each of the pair of bent portions includes a first extended portion extending in one of cage thickness directions and a second extended portion extending in the other cage thickness direction. A roller retaining pawl for retaining the roller is provided at each of the first and second extended portions so as to protrude into the pockets.

Abstract: A cage of the invention is equipped with a first annular portion and a second annular portion that are disposed respectively at both ends in an axial direction, and a plurality of columns which couples the first annular portion and the second annular portion to each other, and which forms a plurality of pockets in which rolling elements are accommodated. The cage is composed of a first body portion and a second body portion that are arranged in the axial direction of the bearing and that are coupled to each other via interlocking columns provided on each of the first and second body portions. At least one of the first body portion and the second body portion has an outer diameter face having recessed therein an oil groove whose base end leads to a corresponding pocket.

Abstract: A cage of a thrust roller bearing includes: a pair of crank-shaped bent portions arranged in a circumferential direction of the cage; a pair of inner wall surfaces arranged in a radial direction of the cage; and a pocket for housing a roller defined by the pair of bent portions and the pair of inner wall surfaces and formed by punching the cage. Radially inner one of the inner wall surfaces is formed as a guiding surface for guiding a substantial roller PCD position of an end surface of the roller. Each of the pair of bent portions includes a first extended portion extending in one of cage thickness directions and a second extended portion extending in the other cage thickness direction. A roller retaining pawl for retaining the roller is provided at each of the first and second extended portions so as to protrude into the pockets.

Abstract: A roller bearing (needle roller bearing) of the cage-and-roller type for a planetary gear mechanism includes a plurality of rollers (needle rollers), and a cage positioning and holding these rollers, and an outside diameter surface of the cage is guided by a bore diameter surface of a planetary gear. An outside diameter dimension of the cage is set to a value which is not smaller than 95% and not larger than 97% of an inner diameter dimension of the planetary gear.

Abstract: A double-split cage includes a strip-shaped metallic sheet curved into a semi-cylindrical shape and having several pockets for accommodating a single row of rollers arranged in the circumferential direction. The strip-shaped metallic sheet has two arch portions separately arranged in the axial direction and includes pillar portions arranged at several positions of both arch portions in the circumferential direction. Both arch portions have protrusions protruding from the pillar portions at both end portions in the circumferential direction, and a forward end portion of each protrusion is chamfered at a corner outside in the axial direction. Length of the chamfered portion in the circumferential direction is larger than the protruding length of each protrusion.

Abstract: A double-split cage includes a strip-shaped metallic sheet curved into a semi-cylindrical shape and having several pockets for accommodating a single row of rollers arranged in the circumferential direction. The strip-shaped metallic sheet has two arch portions separately arranged in the axial direction and includes pillar portions arranged at several positions of both arch portions in the circumferential direction. Both arch portions have protrusions protruding from the pillar portions at both end portions in the circumferential direction, and a forward end portion of each protrusion is chamfered at a corner outside in the axial direction. Length of the chamfered portion in the circumferential direction is larger than the protruding length of each protrusion.

Abstract: A rocker arm is tilted by a cam so as to open and close a valve provided on a cylinder head. This arm comprises a pair of opposing wall portions which are made by folding a flat plate so that they oppose substantially in parallel and cylindrical expanding portions which are formed at tilting fulcrum shaft mounting portions located in a center of the opposing wall portions in the length direction thereof, the expanding portions being expanded in the direction of the tilting fulcrum shaft. The cylindrical expanding portions which are thicker than the opposing wall portions receive a load accompanied by the tilting motion so as to decrease bearing stress applied to the opposing wall portions.

Abstract: A rocker arm is tilted by a cam so as to open and close a valve provided on a cylinder head. This arm comprises a pair of opposing wall portions which are made by folding a flat plate so that they oppose substantially in parallel and cylindrical expanding portions which are formed at tilting fulcrum shaft mounting portions located in a center of the opposing wall portions in the length direction thereof, the expanding portions being expanded in the direction of the tilting fulcrum shaft. The cylindrical expanding portions which are thicker than the opposing wall portions receive a load accompanied by the tilting motion so as to decrease bearing stress applied to the opposing wall portions.

Abstract: An rocker arm is tilted by a cam so as to open and close a valve provided on a cylinder head. This arm comprises a pair of opposing wall portions which are made by folding a flat plate so that they oppose substantially in parallel and cylindrical expanding portions which are formed at tilting fulcrum shaft mounting portions located in a center of the opposing wall portions in the length direction thereof, the expanding portions being expanded in the direction of the tilting fulcrum shaft. The cylindrical expanding portions which are thicker than the opposing wall portions receive a load accompanied by the tilting motion so as to decrease bearing stress applied to the opposing wall portions.

Abstract: A rocker arm is tilted by a cam so as to open and close a valve provided on a cylinder head. This arm comprises a pair of opposing wall portions which are made by folding a flat plate so that they oppose substantially in parallel and cylindrical expanding portions which are formed at tilting fulcrum shaft mounting portions located in a center of the opposing wall portions in the length direction thereof, the expanding portions being expanded in the direction of the tilting fulcrum shaft. The cylindrical expanding portions which are thicker than the opposing wall portions receive a load accompanied by the tilting motion so as to decrease bearing stress applied to the opposing wall portions.

Abstract: A method of manufacturing a rocker arm includes blanking a piece of plate to obtain a base material for forming a rocker arm body, the base material being substantially U-shaped in plan view and having two protrusions which are substantially in parallel with each other. The base material is bent until the two protrusions are confronted substantially in parallel with each other, to provide a pair of side walls having a coupling portion between the side walls. Next, the coupling portion is curved between the side walls to provide a valve engaging portion, and the free end portions of the side walls are fixedly secured to the side walls of a pivot engaging member which is a plat plate having a semi-spherical portion formed by drawing.

Abstract: The invention relates to a rocker arm including a roller, a pair of side walls for supporting the roller, a pivot engaging portion and a valve engaging portion, in which the configuration of the valve engaging portion, and the relative position of the roller, the pivot engaging portion, and the valve engaging portion are set with high accuracy. In the rocker arm, the roller, while being in contact with a cam, is rotatably provided between a pair of side walls forming a rocker arm body. The rocker arm body is of a two-piece structure including a first piece which includes: the pair of side walls adapted to support the roller; and a valve-engaging portion through which, as viewed longitudinally of the rocker arm body, first end portions of the side walls merge with each other; and a second piece which is a pivot engaging member fixedly secured to the remaining second end portions of the side walls.