JP2017206961A - Lubricating oil supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively reduce the shaft power of an oil pump during the relief of engine oil.SOLUTION: A lubricating oil supply device includes an oil pan 11, a lubricating oil pump 13 to be driven by the power of an engine 1, a lubricating oil suction pipe 20 for distributing lubricating oil pumped up from the oil pan 11 by the lubricating oil pump 13, a lubricating oil supply pipe 21 for distributing the lubricating oil forcibly fed from the lubricating oil pump 13, a relief pipe 50 connecting the lubricating oil suction pipe 20 and the lubricating oil supply pipe 21 and bypassing from the lubricating oil pump 13, and a relief valve 14 provided in the relief pipe 50 for opening itself when the hydraulic pressure of the lubricating oil reaches a predetermined value, the relief pipe 50 being connected obliquely to the lubricating oil suction pipe 20 so that the directions of the lubricating oil flowing in the lubricating oil suction pipe 20 and the lubricating oil flowing from the relief pipe 50 back into the lubricating oil suction pipe 20 form an acute angle to be smaller than 90 degrees.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lubricating oil supply device, and more particularly to an engine lubricating oil supply device.

  In general, an engine lubricating oil supply device reduces frictional resistance by introducing engine oil pumped from an oil pan by an oil pump into an oil gallery and supplying the oil to each sliding element.

  In such a lubricating oil supply device, when the engine power of the oil pump increases at medium to high speed, excessive oil pressure in the oil gallery is increased by returning a part of the engine oil to the oil pan through the relief valve. (For example, refer to Patent Documents 1 and 2).

JP, 2006-027257, A Japanese Patent Laid-Open No. 10-054216

  By the way, in the techniques described in Patent Documents 1 and 2, when the engine oil is relieved, the engine oil is directly returned to the oil pan. For this reason, the increase in the shaft power of the oil pump is wasted simply for returning the engine oil to the oil pan, and there is a problem that affects the fuel efficiency of the engine.

  The technology of the present disclosure aims to improve fuel efficiency by effectively reducing the shaft power of an oil pump during the relief of engine oil.

  The technology of the present disclosure includes an oil pan that stores lubricating oil, a lubricating oil pump that is driven by engine power, a lubricating oil suction pipe that distributes lubricating oil pumped up from the oil pan by the lubricating oil pump, and the lubricating oil Provided in the relief pipe, a lubricating oil supply pipe that distributes the lubricating oil pumped from the oil pump, a relief pipe that connects the lubricating oil suction pipe and the lubricating oil supply pipe and bypasses the lubricating oil pump, and A relief valve that opens when the hydraulic pressure of the lubricating oil pumped from the lubricating oil pump reaches a predetermined value, and the relief pipe extends from the lubricating oil flowing through the lubricating oil suction pipe and the relief pipe. It must be connected to the lubricating oil suction pipe at an angle so that the angle formed by the flow direction of the lubricating oil returned to the lubricating oil suction pipe is an acute angle of less than 90 degrees. The features.

  Further, the downstream end of the relief pipe connected to the lubricating oil suction pipe may be formed in a nozzle shape whose diameter decreases toward the connection port.

  According to the technology of the present disclosure, fuel efficiency can be improved by effectively reducing the shaft power of the oil pump during the relief of engine oil.

It is a typical whole block diagram which shows the lubricating oil supply apparatus which concerns on 1st embodiment of this invention. It is a schematic diagram which shows the principal part of the lubricating oil supply apparatus which concerns on 1st embodiment of this invention. (A) is a schematic diagram which shows the principal part of the lubricating oil supply apparatus which concerns on 2nd embodiment of this invention, (B) is typical which shows the principal part of the lubricating oil supply apparatus which concerns on 2nd embodiment of this invention. It is a cross-sectional perspective view.

  Hereinafter, a lubricating oil supply apparatus according to each embodiment of the present invention will be described with reference to the accompanying drawings. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[First embodiment]
As shown in FIG. 1, a lubricating oil supply device 10 supplies engine oil as lubricating oil to each sliding element 31 to 33 of a diesel engine (hereinafter simply referred to as an engine) 1. An oil strainer 12, an oil suction pipe 20, an oil pump 13, a relief valve 14, a first oil supply pipe 21, an oil filter 15, a second oil supply pipe 22, and an oil gallery 30 are provided. .

  The oil pan 11 stores engine oil and is attached to a lower portion of a cylinder block (not shown) of the engine 1. The oil strainer 12 is a filter that removes foreign matters contained in the engine oil, and is immersed in the engine oil in the oil pan 11. The oil strainer 12 is connected to the suction port of the oil pump 13 via the oil suction pipe 20.

  The oil pump 13 pumps up the engine oil in the oil pan 11 and pumps it, and is attached to a side portion of a cylinder block or the like (not shown). The oil pump 13 has a drive shaft connected to the crankshaft 33 via a gear (not shown) and is driven by the power of the engine 1. The discharge port of the oil pump 13 is connected to the inlet port of the oil filter 15 via the first oil supply pipe 21.

  The relief valve 14 is interposed in a relief pipe 50 that connects the first oil supply pipe 21 and the oil suction pipe 20 to bypass the engine oil from the oil pump 13. When the hydraulic pressure of the engine oil pumped from the oil pump 13 reaches a predetermined value when the engine 1 rotates at a medium to high speed, the relief valve 14 causes the valve body 14B in the cylinder 14A to resist the urging force of the spring 14C by the hydraulic pressure. It opens by moving. When the relief valve 14 is opened, a part of the engine oil pumped by the oil pump 13 is returned to the oil suction pipe 20 via the relief pipe 50, thereby suppressing an excessive increase in hydraulic pressure in the oil gallery 30. It is like that. Details of the relief pipe 50 will be described later.

  The oil filter 15 removes foreign matters contained in engine oil pumped from the oil pump 13, and a filter element 15B functioning as a filter medium is accommodated in the housing 15A. A second oil supply pipe 22 is connected to the outlet port of the oil filter 15.

  An oil gallery 30 is connected to the downstream end of the second oil supply pipe 22. The engine oil introduced into the oil gallery 30 is supplied to the sliding elements 31 to 33 such as the valve operating mechanism 31, the oil jet 32, the journal portion of the crankshaft 33, and the rotating shaft of a turbocharger (not shown). After the moving elements 31 to 33 are lubricated, they are returned to the oil pan 11.

  Next, the details of the relief pipe 50 will be described with reference to FIG.

  The relief pipe 50 includes an upstream relief pipe 51 and a downstream relief pipe 52. The upstream relief pipe 51 connects the first oil supply pipe 21 and the inlet port 14D of the relief valve 14. The downstream relief pipe 52 connects the outlet port 14 </ b> E of the relief valve 14 and the oil suction pipe 20.

  In the present embodiment, the downstream end 52A of the downstream relief pipe 52 includes the main oil MO1 that is pumped up by the oil pump 13 and flows through the oil suction pipe 20, and the relief oil RO that is returned from the downstream relief pipe 52 to the oil suction pipe 20. The oil suction pipe 20 is obliquely connected so that the angle formed by the flow direction becomes an acute angle greater than 0 degrees and less than 90 degrees.

  In this way, by connecting the downstream end 52A of the downstream relief pipe 52 to the oil suction pipe 20 obliquely toward the oil pump 13, the relief oil RO is returned to the oil pump 13 without being returned to the oil pan 11. It becomes like this. When the relief oil RO is returned to the oil pump 13, the main oil MO2 sucked into the oil pump 13 is increased, and the shaft power of the oil pump 13 is reduced. This effectively reduces the load.

  As described above in detail, according to the lubricating oil supply device 10 of the present embodiment, the angle formed by the flow direction between the main oil MO in the oil suction pipe 20 and the relief oil RO returned to the oil suction pipe 20 is 90. By connecting the downstream relief pipe 52 obliquely with respect to the oil suction pipe 20 so as to have an acute angle of less than 5 degrees, the relief oil RO is returned to the oil pump 13 without being returned to the oil pan 11. Become.

  In this way, the oil pump 13 is recirculated to the oil pump 13 and the main oil MO2 sucked into the oil pump 13 is increased, so that the oil pump is compared with the conventional structure in which the relief oil RO is directly returned to the oil pan 11. 13 shaft power can be effectively reduced, and the fuel efficiency of the engine 1 can be improved.

  Further, since the shaft power of the oil pump 13 is reduced, the load applied to a power transmission element such as a gear transmitting a driving force from the engine 1 to the oil pump 13 or a pulley or a belt can be effectively reduced. The durability of the engine 1 can be improved.

[Second Embodiment]
Next, based on FIG. 3, the detail of the lubricating oil supply apparatus 10 which concerns on 2nd embodiment is demonstrated.

  The lubricating oil supply device 10 of the second embodiment is obtained by changing the shape of the downstream end 52B of the downstream relief pipe 52. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the downstream side relief pipe 52 of the second embodiment, the downstream end 52B connected to the oil suction pipe 20 is formed in a nozzle shape whose diameter decreases toward the connection port 52C. Thus, the downstream end 52B of the downstream relief pipe 52 is formed into a nozzle shape, so that the relief oil RO joins the oil suction pipe 20 at an increased flow rate. As a result, the flow rate of the main oil MO2 sucked into the oil pump 13 can be effectively increased, and the shaft power of the oil pump 13 is further reduced, thereby reliably improving the fuel efficiency performance of the engine 1. It becomes possible.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  For example, the lubricating oil supply apparatus 10 is not limited to the engine 1, and is an apparatus that supplies lubricating oil to other components other than the engine 1 as long as the lubricating oil supply apparatus 10 includes the oil pump 13, the relief valve 14, and the relief pipe 50. There may be.

  The engine 1 is not limited to a diesel engine, and can be widely applied to other engines such as a gasoline engine.

DESCRIPTION OF SYMBOLS 1 Engine 10 Lubricating oil supply apparatus 11 Oil pan 12 Oil strainer 13 Oil pump 14 Relief valve 15 Oil filter 20 Oil suction pipe 21 First oil supply pipe 22 Second oil supply pipe 30 Oil gallery 31 Valve mechanism 32 Oil jet 33 Crank Shaft 50 Relief piping 51 Upstream relief piping 52 Downstream relief piping

Claims (2)

An oil pan for storing lubricating oil;
A lubricating oil pump driven by the power of the engine;
A lubricating oil suction pipe for circulating lubricating oil pumped up from the oil pan by the lubricating oil pump;
Lubricating oil supply piping for circulating lubricating oil pumped from the lubricating oil pump;
A relief pipe that connects the lubricating oil suction pipe and the lubricating oil supply pipe to bypass the lubricating oil pump;
A relief valve that is provided in the relief pipe and opens when the hydraulic pressure of the lubricating oil pumped from the lubricating oil pump reaches a predetermined value,
The relief pipe has an acute angle of less than 90 degrees formed by the flow direction of the lubricating oil flowing through the lubricating oil suction pipe and the flow direction of the lubricating oil returned from the relief pipe to the lubricating oil suction pipe. Lubricating oil supply device characterized in that it is connected to the suction pipe at an angle. The lubricating oil supply apparatus according to claim 1, wherein a downstream end of the relief pipe connected to the lubricating oil suction pipe is formed in a nozzle shape whose diameter decreases as the inner diameter goes toward the connection port.

Images