Pressure oil feeder
A supply device and oil supply technology, which is applied in the direction of pump devices, fluid pressure actuators, accumulator devices, etc., can solve the problems such as the inability to realize the generalization of components, and achieve the effect of generalization and simplified structure
Inactive Publication Date: 2006-07-12
KOMATSU LTD
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Problems solved by technology
[0034] From this, it can be seen that the pressure oil on the high-pressure side among the pressure oil discharged from the two pressure oil discharge ports 1b and 1c of the hydraulic pump 1 cannot be supplied to the pressure oil supply port 21e of the PC valve 21 by using the conventional technology. , supply the pressure oil on the low pressure side to the pressure oil supply port 21f of the PC valve 21
Therefore, it is not possible to use Figure 8 The PC valve 21 of the swash plate driving mechanism part 16 shown in Fig. 7 is replaced by the PC valve 19 of the swash plate driving mechanism part 16 shown in FIG.
Method used
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Embodiment Construction
[0057] Next, embodiments of the hydraulic oil supply device of the present invention will be described with reference to the drawings.
[0058] FIG. 1 is a hydraulic circuit diagram of Embodiment 1. FIG.
[0059] The hydraulic circuit shown in Fig. 1 is generally arranged in a construction machine such as a bulldozer that uses a hydraulic pump as a driving source to drive a hydraulic actuator.
[0060] The hydraulic pump 1 is a capacity-variable swash plate type hydraulic pump, which is the same as that shown in FIG. 7 and has two pressure oil discharge ports 1b and 1c, and the two pressure oil discharge ports share a swash plate 1a.
[0061] The hydraulic pump 1 is connected to the engine 2 through a rotating shaft. The rotation of the engine 2 drives the rotation shaft 3 to drive the hydraulic pump 1 . The hydraulic pump 1 changes the displacement (discharge volume) q (cc / rev) by changing the inclination angle of the swash plate 1a.
[0062] The swash plate driving mechan...
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The invention simplifies the structure of a hydraulic circuit by feeding the pressure oil discharged from two pressure oil discharge ports to high pressure feed port and a low pressure feed port after sorting the discharged oil into high and low pressure oils so as to share components. A pressure oil P1 discharged from a pressure oil discharge port 1b is assumed to be higher in pressure than a pressure oil P2 discharged from a pressure oil discharge port 1c. In this case, the outlet of a check valve 32 is shut out, and the outlet of a check valve 31 is opened. Accordingly, the pressure oil P1 on the high pressure side is output from the check valve 32 to a pipeline 55, and fed to a high pressure oil feed port 21e. Also, the pilot check valve 34 is opened, and the pilot check valve 33 is shut out. As a result, the pressure oil P2 on the low pressure side is output from the pilot check valve 34 to a pipeline 56, and fed to a low pressure oil feed port 21f.
Description
technical field [0001] The present invention relates to a pressure oil supply device, which is a high-pressure supply device for supplying high-pressure oil in two lines of pressure oil discharged from two outlets of a pressure oil supply source to an object to be supplied with pressure oil. The port is a low-pressure supply port for supplying low-pressure hydraulic oil to the object to be supplied with hydraulic oil. Background technique [0002] For hydraulic pumps used in construction machinery, self-pressurized auxiliary controls are generally used. [0003] The so-called self-pressure auxiliary control is to control the discharge volume q (cc / rev) of its own hydraulic pump by using the discharge pressure oil of the hydraulic pump as the driving source. If a swash plate piston pump is used to control the discharge volume q, it is to control the inclination angle of its swash plate. This self-pressure auxiliary control has the advantage of eliminating the need for anoth...
Claims
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IPC IPC(8): F15B11/16E02F9/22F04B23/00F15B1/00F15B11/00
Inventor 新井满野口英昭
Owner KOMATSU LTD