Hitachi Construction Machinery Co., Ltd.

Toyo Tire Rubber Co., Ltd.

Tomoyuki Saito

Hiroyuki Kamata

Toshihiro Abe

Shohei Kamiya

Hidefumi Hiramatsu

Hitoshi Nishiguchi

Hiroki Sugawara

Kazuma Higashi

Eri Saijo

An expansion tank, while maintaining gas-liquid separation performance of coolant circulating through an engine cooling apparatus, can absorb pressure variations occurring with volume change of the coolant even when an excessive amount of coolant is supplied. A bulkheadpartitions an expansion tankinto separate chambers Rto Rthat communicate with each other via a first communication holepositioned lower than a FULL line. The separate chambers Rto Rthat constitute a separate chamber group X communicate with each other via a third communication holepositioned higher than the FULL line. The separate chambers Rto Rthat constitute a separate chamber group Y communicate with each other via a fourth communication holepositioned higher than the FULL line. The separate chamber Rand the separate chamber Rcommunicate with each other via a second communication holedisposed at the height of the FULL line.

Expansion tank

An anti-vibration device according to the present invention makes it possible to achieve compactness and sufficient durability without increasing the number of parts. To be specific, an anti-vibration memberis made up of an inner cylinder, an outer ring, and a rubber-like elastic body. The outer ringis disposed outside the inner cylinder. The outer ringis attached to a frame-side member. An end plateis provided at an outer end portion of the inner cylinder. The rubber-like elastic bodyis disposed between the inner cylinder, the outer ring, and the end plate. The anti-vibration rubber assemblyis provided on each side of the frame-side member. A guide memberis interposed between the two inner cylindersand is unified therewith. The inner cylinderis attached to an engine-side bracket. The guide memberfaces the outer ringin the radial direction and guides the inner cylinderin the up-and-down direction. Damage of the rubber-like elastic bodydue to displacement in the horizontal direction is prevented while an engineis elastically supported thereby suppressing vibration.

Anti-vibration device

Front and rear side flange portions of a filter accommodating cylinder are provided with positioning pins. A flange portion of an upstream cylinder is provided with a notched groove and a flange portion of a downstream cylinder is provided with a notched groove. In consequence, when the filter accommodating cylinder is connected between the upstream cylinder and the downstream cylinder, each of the positioning pins disposed at the front and rear flange portions is engaged with each notched groove of the upstream cylinder and the downstream cylinder. The filter accommodating cylinder can be positioned to be coaxial with the upstream cylinder and the downstream cylinder. As a result, after performing a cleaning operation to a DPF, an operation of once again connecting the filter accommodating cylinder between the upstream cylinder and the downstream cylinder can be quickly and easily performed.

Exhaust gas treatment device

An engaging groove () with which a gasket () is engaged is provided in each of a front side projecting portion () and a rear side projecting portion () formed in a filter accommodating cylinder () to be positioned on an outer peripheral surface (A,A) of each projecting portion (). Therefore, when the gasket () latches on each of the projecting portion () to be fitted thereon from an outside, the gasket () can be engaged with the engaging groove () provided in each of the projecting portions (). In consequence, at the time of mounting and removing the filter accommodating cylinder (), the falling-off of the gasket () can be prevented, and, for example, an inspection operation, a cleaning operation and the like of an accommodated particulate matter removing filter () can be easily performed.

A support member () is provided on a cylindrical member () of an upstream cylinder (). A connector portion (C) of a first temperature detector () for detecting the temperature of exhaust gas flowing into an oxidation catalyst (), a connector portion (C) of a second temperature detector () for detecting the temperature of the exhaust gas flowing into a particulate matter removing filter (), and a sensor portion (A) of a pressure detector () for detecting the front and rear pressures of the particulate matter removing filter () are arranged to be mounted on this support member (). Accordingly, the support member () is capable of supporting the connector portions (C,C) of the temperature detectors () and the sensor portion (A) of the pressure detector () in one location in a concentrated manner, so that harnesses on a controller side can be easily connected thereto.

Exhaust gas purifying device

An hydraulic excavator is provided with an exhaust gas treatment apparatus in an exhaust pipe for effecting the purification treatment of exhaust gas including capturing the particulate matter in the exhaust gas. A space provided for mounting and removing a filter accommodating cylinder () is formed between the upstream cylinder () and the downstream cylinder (). In particular, upwardly inclined connecting surfaces (E andE) are provided on flange portions of upstream and downstream cylinders (and), respectively, and downwardly inclined connecting surfaces (F andG) are provided on upstream side flange portions of filter accommodating cylinder (). In consequence, a substantially V-shaped insertion space (S) which is gradually enlarged from a lower side to an upper side can be formed between the upstream cylinder () and the downstream cylinder ().

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Kasumigaura, Japan

Tomoyuki Saito