SE437419B - INTERMITTENT OPERATION HYDRAULIC ENGINE - Google Patents

Description

rv3121ss-7 _2 According to the invention, in the embodiment shown, one drain line 6 drawn from the housing 1 of the engine to a collection tank 7. From a bottom outlet in this, a line 8 passes via a non-return valve 9 to the engine l pressure line Ä at a point after 5 control valve 5. With 10, the motor return line to the supply tank 2 designated.

The arrangement described above operates as follows: During operation, the engine l drains leaked oil to the tank 7. When the control valve 5 closes, the engine decelerates and works underneath 10 this time due to its inertia as a pump to via it now opened the non-return valve 9, suck in the oil accumulated in the tank 7 motor pressure line H. In this case the deceleration of the motor takes place smoothly, which counteracts cavitation damage and also enables one higher engine speed range. The 2-hose system described above can be used to advantage at e.g. folding brake cranes with extension boom for supply and return of oil out to resp. from the crane arm tip, where the folding unit or other tool with different functions is placed. Conventional Separately, separate hydraulic lines (pressure and return) are used for 20 each function. This requires considerably more space than if according to the invention uses only two hydraulic hoses, and electrically controlled directional valves for the various functions are placed outside in the crane arm tip. 7 7 The invention is not limited to the embodiment described above. Without various modifications are conceivable, such as the separate the tank for the drainage oil can be formed by a directly on the engine built collection chamber, as well as the unidirectional direction of the oil from the chamber can be provided in other ways than by means of the the valve. f - '' - 13535? : a: 5 "., 9: _ 'V Qïj-Lïxßasm.

Claims (2)

5 Patcntkrav Device for hydraulic motor (1) for intermittent operation, wherein the motor is fed via a control valve (5) and to this connection inlet fuse (4) through a hydraulic pump (3) from a pre-tank (2), where also the motor return line (10 ), characterized in that a connection (6) for draining drainage oil leads from the motor housing to a collecting chamber (7), which has a connection (8) with non-return valve (9) 7 to the inlet line of the hydraulic motor (1) (4), so that when closing the control valve (5) to stop the engine, this due to its inertia is caused to operate during the deceleration time as a pump for emptying the oil (7) of the chamber (7) in the inlet line (4) and thus return to the engine. Device according to claim 1, characterized in that the collection chamber (7) consists of a separate tank, and said two connections (6 and 8) consist of pipelines. 7812135-7 poon ears ala- ~ 'vw "