Kubota Patente

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To provide a working machine to improve responsiveness at low temperature. A working machine (1) includes a first outlet port (P1) and a second outlet port (P2) to allow hydraulic fluid to flow out therefrom, a plurality of first hydraulic actuators (A1) to be supplied with hydraulic fluid from the first outlet port, a plurality of second hydraulic actuators (A2) to be supplied with hydraulic fluid from the second outlet port, a load pressure selection valve (V15) to receive input of a load pressure on the plurality of first hydraulic actuators and a load pressure on the plurality of second hydraulic actuators, and output a highest load pressure which is higher one of the load pressure on the plurality of first hydraulic actuators and the load pressure on the plurality of second hydraulic actuators, a regulator (20) to receive input of the highest load pressure output from the load pressure selection valve and control a discharge rate of the hydraulic fluid from the first outlet port and a discharge rate of the hydraulic fluid from the second outlet port according to the input highest load pressure, a passage throttle (43) provided in a load pressure transmission passage (x3) provided between the regulator and the load pressure selection valve, and a bleed path (45) to allow a portion of the hydraulic fluid in a segment passage (44) to escape to a destination other than the regulator, the segment passage being a portion of the load pressure transmission passage that is located between the load pressure selection valve and the passage throttle.

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The present invention provides an engine in which a decompression mechanism is simplified. The engine 10 comprises: an engine block 11, a cylinder chamber 12 formed inside the engine block 11, and an extension space 33 formed inside the engine block 11 and extending laterally from the cylinder chamber 12. Furthermore, the engine 10 comprises: a decompression valve installation hole 22 formed in the engine block 11 in a portion forming the extension space 33, a decompression valve 23 arranged so as to be capable of advancing and retreating with respect to the decompression valve installation hole 22, and a decompression valve advancing/retreating mechanism 50 that causes the decompression valve 23 to perform an advancing/retreating operation.

The present invention provides an engine in which the positions of each valve and a spark plug are optimized with respect to an extension space. The engine 10 comprises: a cylinder chamber 12, an intake valve 18, an exhaust valve 19, and a spark plug 26. Inside the cylinder chamber 12, opposing pistons are arranged so as to reciprocate. An extension space 33 is a space continuous from an intermediate portion of the cylinder chamber 12 toward a side. On a first side surface 3313 of the extension space 33, a first intake valve 181 is arranged. On a second side surface 3314 of the extension space 33, which opposes the first side surface 3313, a first exhaust valve 191 and a first spark plug 261 are arranged.

Provided is an opposed-piston engine capable of minimizing a mechanism for transmitting rotational power of a crankshaft to a valve. An opposed-piston engine (1) includes a cylinder (4), a first piston (8A) provided in the cylinder, a second piston (8B) provided in the cylinder and opposed to the first piston, a first crankshaft (9A) which rotates as the first piston rotates, a second crankshaft (9B) which rotates as the second piston rotates, a valve (13) which performs an operation to intake or exhaust air into or from the cylinder, and a power transmission mechanism (20) which transmits the rotational power of the first crankshaft to the valve so as to cause the valve to perform the operation. The first crankshaft and the second crankshaft are juxtaposed with a space therebetween in an alignment direction in which the first piston and the second piston are aligned, and the power transmission mechanism extends in the alignment direction to a position corresponding to the first crankshaft and to a position corresponding to the second crankshaft across the space therebetween.

The present invention provides an engine that can optimize valves and their advancing/retreating mechanisms in the vicinity of a cylinder chamber. The engine 10 comprises: a cylinder chamber 12, an intake valve 18, an exhaust valve 19, and an advancing/retreating mechanism 20 that advances and retreats the intake valve 18 and the exhaust valve 19. The advancing/retreating mechanism 20 has a camshaft 21, an exhaust cam 22, an intake cam 23, a pushrod 24, and a rocker arm 25. The intake cam 23 is fixed to the camshaft 21 and is configured to advance and retreat the intake valve 18. The exhaust cam 22 is configured to advance and retreat the pushrod 24. The rocker arm 25 is rotated by the pushrod 24 and is configured to advance and retreat the exhaust valve 19.