Variable displacement oil pump and oil supply system using the same
A variable and capacity technology, applied to pumps, pump components, pump control, etc., can solve problems such as inability to ensure oil discharge, and achieve stable discharge pressure and stable pump discharge.
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no. 1 approach 〕
[0036] figure 1 The hydraulic circuit in the first embodiment is shown, and the variable capacity oil pump 10 is rotated by the rotational driving force transmitted from the crankshaft of the internal combustion engine, sucks the oil stored in the oil pan 01 from the suction passage 03 through the filter 02, and flows it from the The discharge passage 04 discharges to the main oil gallery 05 of the engine.
[0037] In the relief passage 06 branched from the discharge passage 04, a check ball type relief valve 07 for returning oil to the oil pan 01 when the pump discharge pressure rises excessively is provided.
[0038] The main oil gallery 05 supplies oil to the sliding parts of the engine, the valve timing control device, and the bearing of the crankshaft, and a first filter for capturing foreign matter in the flowing oil is provided on the upstream side of the discharge passage 04 side. Oiler 1. In addition, a bypass passage 08 of the first oil filter 1 that bypasses the m...
no. 2 approach 〕
[0115] Figure 8 The second embodiment is shown, and an oil pump 10 and an electromagnetic switching valve 40 are integrated. That is, the oil pump 10 is integrally formed on the outer circumference of the cam ring 17 with the annular convex portion 17f formed with the communication hole 36 communicating with the discharge port 22 similarly provided on the cover member 12 and the pump body. The discharged oil is directed to the discharge hole 22a.
[0116] The electromagnetic switching valve 40 has the same structure as the first embodiment, and the valve body 41 is press-fitted and fixed in an unillustrated valve housing hole provided inside the cylinder wall 37 integrally provided with the pump body 11 . The first communication hole 25a and the second communication hole 25b respectively communicating with the first control oil chamber 31 and the second control oil chamber 32 are formed in a groove shape in the pump body 11, and the cover member 12 is attached to the pump bo...
no. 3 approach 〕
[0122] Figure 11 and Figure 12 The third embodiment is shown. In this embodiment, the basic structure of the oil pump 10, the electromagnetic switching valve 40, etc., and the oil pressure passage are the same as those of the first embodiment, but the difference is that the supply and discharge passage 6 of the electromagnetic switching valve 40 A pilot valve 50 is provided. Components common to those of the first embodiment are denoted by the same reference numerals and description thereof will be omitted.
[0123] In this third embodiment, the upstream portion A is defined from the first branch passage 3 to the electromagnetic switching valve 40 , the intermediate portion B is defined between the electromagnetic switching valve 40 and the pilot valve 50 , and the space between the pilot valve 50 and the oil pump 10 is defined as the upstream portion A. The downstream part C is thus divided into these three parts to describe the structure.
[0124] The pilot valve 50 acc...
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