JP5552446B2 - Engine lubrication equipment - Google Patents

Description

  The present invention relates to an engine lubrication device.

  Engines are generally lubricated with oil. For example, Patent Documents 1 to 3 disclose techniques for supplying oil to a cylinder head or the like without using an oil gallery.

JP 2005-256694 A Japanese Patent Laid-Open No. 2005-120827 JP 2008-31958 A

  FIG. 5 is a diagram showing an example of a general engine lubrication apparatus 1X. The engine lubricating device 1X is applied to an engine 50X including a cylinder head 51X and a cylinder block 52X. Moreover, the 1st oil tank 11X, the 1st oil pump 12X, and the oil gallery part 30X are provided. The first oil pump 12X sucks up oil from the first oil tank 11X. And oil is supplied to the cylinder head 51X and the cylinder block 52X by supplying oil to the oil gallery part 30X. The oil supplied to the cylinder head 51X and the cylinder block 52X is supplied to each part and then returned to the first oil tank 11X.

  When supplying oil to each part of the engine 50X while ensuring the required oil amount and oil pressure, the engine lubrication device 1X shares at least the total required oil amount and required oil pressure of each part to which oil is supplied in parallel. The first oil pump 12X needs to be secured. Furthermore, the first oil pump 12X needs to supply oil so that the required oil amount and hydraulic pressure are secured in the respective parts having different required oil amounts and different hydraulic pressures.

  Therefore, in this case, useless work is generated in the oil pump because oil is supplied more than necessary in any one of the parts. Further, the friction generated in the oil pump increases as the capacity of the oil pump increases.

  In view of the above problems, an object of the present invention is to provide an engine lubrication device capable of enhancing energy saving while securing necessary oil amount and hydraulic pressure when supplying oil to each part of the engine.

The present invention is applied to an engine including a cylinder head and a cylinder block, and includes an oil gallery portion for circulating oil, a first oil tank provided in a lower portion of the engine, and the first oil tank without the oil gallery portion. A first oil pump that supplies oil from the oil tank to the cylinder head, a second oil tank that is provided at a height higher than the cylinder block and that collects oil from the cylinder head, and the second oil By supplying oil from the tank to the oil gallery, a second oil pump that supplies oil to the cylinder block, and bypassing the cylinder block from the second oil tank to the first oil tank comprising a bypass passage for circulating oil, and the second Oirupon Is an electric oil pump, and when the engine is started and before the crankshaft of the engine rotates, the second oil pump is operated, and the operating power of the second oil pump is a predetermined value. The engine lubrication apparatus further includes a control unit that stops the second oil pump before the crankshaft of the engine rotates when the engine speed is larger than .

  ADVANTAGE OF THE INVENTION According to this invention, when supplying oil to each part of an engine, energy saving property can be improved, ensuring a required oil amount and hydraulic pressure.

It is a schematic block diagram of an engine lubrication device. It is a schematic block diagram of ECU. It is a figure which shows a 1st operation | movement with a flowchart. It is a figure which shows a 2nd operation | movement with a flowchart. It is a figure which shows an example of the general lubrication apparatus of an engine.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of an engine lubrication device (hereinafter simply referred to as a lubrication device) 1A. The lubricating device 1 </ b> A includes a first oil tank 11, a first oil pump 12, a second oil tank 21, a second oil pump 22, an oil gallery portion 30, and a bypass passage portion 40. Yes. The lubricating device 1 </ b> A is applied to an engine 50 including a cylinder head 51 and a cylinder block 52.

  The first oil tank 11 is an oil pan and is provided below the engine 50. The first oil pump 12 supplies oil from the first oil tank 11 to the cylinder head 51. The second oil tank 21 is provided at a height higher than the cylinder block 52 and collects oil from the cylinder head 51. The second oil pump 22 supplies oil from the second oil tank 21 to the cylinder block 52.

  The first oil pump 12 is a mechanical oil pump that is driven by the output of the engine 50. The second oil pump 22 is an electric oil pump. However, the present invention is not necessarily limited to this, and the first oil pump 12 may be, for example, an electric oil pump, and the second oil pump 22 is, for example, a mechanical oil pump that is driven by the output of the engine 50. Also good.

  The oil gallery 30 distributes oil. The oil gallery 30 is provided so that oil flows through the cylinder block 52 of the cylinder head 51 and the cylinder block 52. In this regard, the first oil pump 12 supplies oil from the first oil tank 11 to the cylinder head 51 without going through the oil gallery 30. On the other hand, the second oil pump 22 supplies oil to the cylinder block 52 by supplying oil from the second oil tank 21 to the oil gallery 30. The oil gallery 30 may be a part of the cylinder block 52 or may be provided in the cylinder block 52 as a separate structure from the cylinder block 52.

  The cylinder head 51 is provided with a chain jet P11, a lash adjuster (HLA) P12, a cam journal P13, and a cam shower P14. Specifically, the oil supplied to the cylinder head 51 by the first oil pump 12 is supplied in parallel to these P11, P12, P13, and P14. The oil supplied to the lash adjuster P12, the cam journal P13, and the cam shower P14 is collected by the second oil tank 21. As a result, the second oil tank 21 collects at least an amount of oil that can maintain oil lubrication in the cylinder block 52 from the cylinder head 51. The oil supplied to the chain jet P11 is collected by the first oil tank 11.

  The cylinder block 52 is provided with an oil jet P21, a crank journal P22, a piston P23, a cylinder bore P24, and a crank pin P25. Specifically, the oil supplied to the cylinder block 52 by the second oil pump 22 is supplied in parallel to the oil jet P21 and the crank journal P22.

  In this regard, the oil gallery 30 is specifically provided so as to circulate oil between the oil jet P21 and the crank journal P22. And the inlet of the oil gallery part 30 is provided in the position higher than the crank journal P22. The second oil tank 21 is provided at a position higher than the inlet of the oil gallery 30.

  The oil supplied to the oil jet P21 is supplied by being injected to the piston P23 and the cylinder bore P24. Part of the oil supplied to the crank journal P22 is supplied to the crankpin P25, and the rest is recovered by the first oil tank 11. The oil supplied to the piston P23, the cylinder bore P24 or the crankpin P25 is collected by the first oil tank 11.

  The bypass passage portion 40 is provided to bypass the cylinder block 52 from the second oil tank 21 to the first oil tank 11 and to distribute oil. Specifically, the bypass passage portion 40 is provided so that oil flows in when the oil level in the second oil tank 21 is higher than a predetermined height, and the inflowed oil is removed from the second oil tank 21. The first oil tank 11 is provided to bypass the cylinder block 52 and to flow.

  The predetermined height is higher than that required by the cylinder block 52 when the oil amount and hydraulic pressure required by the cylinder head 51 are larger than those by the cylinder block 52 (for example, when the rotational speed of the engine 50 is low). The excess oil present in the second oil tank 21 can be set to a height at which the second oil tank 22 can be circulated from the second oil tank 22 to the first oil tank 11.

  Next, the function and effect of the lubricating device 1A will be described. The lubricating device 1 </ b> A supplies oil to the cylinder head 51 with the first oil pump 12 and supplies oil to the cylinder block 52 with the second oil pump 22. For this reason, the lubricating device 1A supplies oil to each part of the engine 50, for example, compared with the first oil pump 12X provided in the lubricating device 1X described above, while ensuring the necessary oil amount and hydraulic pressure, the oil pump The capacity of each of 12 and 22 can be reduced.

  In the lubricating device 1 </ b> A, the second oil tank 21 is provided at a height higher than the cylinder block 52. For this reason, the lubricating device 1 </ b> A can reduce the capacity of the second oil pump 22 by supplying oil to the cylinder block 52 while using the gravity with the second oil pump 22.

  The lubricating device 1A is provided with a bypass passage portion 40 through which oil flows so as to bypass the cylinder block 52 from the second oil tank 21 to the first oil tank 11. For this reason, the lubricating device 1A supplies more oil than necessary to the cylinder block 52 by bypassing the surplus oil present in the second oil tank 21 more than necessary by the cylinder block 52 by the bypass passage portion 40. You can avoid it. As a result, it is possible to prevent unnecessary work from being generated in the second oil pump 22.

  As a result, the lubricating device 1A makes the work of each of the oil pumps 12 and 22 smaller than the work of the first oil pump 12X as compared with the case of the lubricating device 1X described above, for example. The total work amount of 22 can be made smaller than the work amount of the first oil pump 12X. As a result, when supplying oil to each part of the engine 50, it is possible to improve energy saving while securing a necessary oil amount and hydraulic pressure.

  Further, when the oil amount and hydraulic pressure required by the cylinder head 51 are larger than those required by the cylinder block 52, the lubricating device 1 </ b> A has more excess oil present in the second oil tank 21 than required by the cylinder block 52. Is set to a height at which the oil can be circulated from the second oil tank 21 to the first oil tank 11, so that the amount of oil necessary for supplying oil to each part of the engine 50 The hydraulic pressure can be suitably secured.

  The lubricating device 1A is provided with the second oil tank 21 at a position higher than the inlet of the oil gallery part 30, and the inlet of the oil gallery part 30 is connected to the crank journal P22 (of the part through which the oil gallery part 30 circulates oil) By providing it at a position higher than at least any part), it is possible to allow oil to flow through the crank journal P22.

  In this case, the lubrication apparatus 1A further supplies oil from the second oil tank 21 to the crank journal P22 (at least one of the parts through which the oil gallery 30 circulates oil) with the second oil pump 22 being stopped. The second oil pump 22 can be actuated as necessary by allowing the oil to flow by its own weight. As a result, the energy saving property can be further enhanced.

  The lubricating device 1B according to the present embodiment is substantially the same as the lubricating device 1A except that the lubricating device 1B further includes an ECU 70A. For this reason, illustration of the lubricating device 1B is omitted. FIG. 2 is a schematic configuration diagram of the ECU 70A. The ECU 70A is an electronic control device, and includes a microcomputer including a CPU 71, a ROM 72, a RAM 73, and input / output circuits 74 and 75. These components are connected to each other via a bus 76.

  Various sensors and switches such as an ignition SW 81 for starting the engine 50 are electrically connected to the ECU 70A. Various control objects such as the second oil pump 22 and a starter motor 55 that starts the engine 50 are electrically connected.

  The ROM 72 is configured to store a program in which various processes executed by the CPU 71 are described, map data, and the like. Various functions are implemented in the ECU 70A by executing processing while the CPU 71 uses the temporary storage area of the RAM 73 as necessary based on the program stored in the ROM 72. For example, the ECU 70A implements a control unit that operates the second oil pump 22 when the engine 50 is started and before the crankshaft (not shown) of the engine 50 rotates.

  Next, the operation of the ECU 70A as the first operation will be described with reference to the flowchart shown in FIG. The ECU 70A determines whether or not the engine 50 has been started (step S1). Whether or not the engine 50 has been started can be determined, for example, based on whether or not the ignition SW 81 is turned on. If the determination is negative, this flowchart is temporarily terminated.

  On the other hand, if an affirmative determination is made in step S1, it is determined that the engine 50 is starting. At this time, the ECU 70A operates the second oil pump 22 (step S2). Thereby, the second oil pump 22 can be operated when the engine 50 is started. Subsequently, the ECU 70A operates the starter motor 55 (step S3). As a result, the crankshaft rotates and the engine 50 starts combustion. Thus, the second oil pump 22 can be operated before the crankshaft rotates.

  Next, the function and effect of the lubricating device 1B will be described. The lubrication device 1B can supply oil to the cylinder block 52 by operating the second oil pump 22 as described above before the crankshaft and the piston P23 start to operate. For this reason, for example, even after the engine 50 has been stopped for a long time, seizure and wear due to the oil film running out of the crankshaft and the piston P23 can be prevented.

  Further, the lubrication device 1B operates as described above by operating only the second oil pump 22 of the oil pumps 12 and 22 when both the oil pumps 12 and 22 are electric oil pumps, for example. As compared with the case where the first oil pump 12X is similarly operated, the work amount can be significantly reduced.

  The lubricating device 1C according to the present embodiment is substantially the same as the lubricating device 1B, except that the ECU 70B is provided instead of the ECU 70A. The ECU 70B is substantially the same as the ECU 70A except that the control unit is realized as described below. For this reason, illustration of the lubricating device 1C and the ECU 70B is omitted.

  In the ECU 70B, the control unit operates the second oil pump 22 when the engine 50 is started and before the crankshaft of the engine 50 rotates, and the operating power of the second oil pump 22 is larger than a predetermined value α. In this case, the second oil pump 22 is stopped before the crankshaft of the engine 50 rotates. The operating power of the second oil pump 22 can be measured by the output circuit 75, for example.

  Next, the operation of the ECU 70B as the second operation will be described with reference to the flowchart shown in FIG. The ECU 70B determines whether or not the engine 50 has been started (step S11). If the determination is negative, this flowchart is temporarily terminated. If the determination is affirmative, the ECU 70B operates the second oil pump 22 (step S12). Subsequently, the ECU 70B measures the operating power of the second oil pump 22 (step S13). Then, it is determined whether or not the measured operating power is larger than a predetermined value α (step S14). By determining whether or not the operating power is greater than the predetermined value α, it is possible to determine whether or not the oil viscosity is higher than a predetermined degree.

  If a negative determination is made in step S14, it is determined that the oil viscosity is not more than a predetermined degree. At this time, the ECU 70B operates the starter motor 55 (step S21). As a result, the crankshaft rotates and combustion starts. On the other hand, if an affirmative determination is made in step S14, it is determined that the oil viscosity is higher than a predetermined degree. At this time, the ECU 70B stops the second oil pump 22 (step S15) and operates the starter motor 55 (step S16).

  As a result, the crankshaft rotates and combustion starts. As a result, when the operating power is larger than the predetermined value α, the second oil pump 22 can be stopped before the crankshaft rotates. After combustion is started in step S16, the ECU 70B restarts the second oil pump 22 (step S17).

  Next, the function and effect of the lubricating device 1C will be described. The lubricating device 1 </ b> C can grasp the oil viscosity when the engine 50 is started by measuring the operating power of the second oil pump 22. Then, when the operating power is higher than the predetermined value α, the second oil pump 22 is stopped, and when the oil viscosity is higher than a predetermined degree, the second oil pump 22 consumes power. You can avoid that.

  For this reason, the lubricating device 1 </ b> C can contribute to securing a large battery power necessary for the operation of the starter motor 55 when the oil viscosity is higher than a predetermined degree. As a result, it is possible to further reduce the size of the battery as compared with the lubricating device 1B. In addition, when the engine 50 is started and before the crankshaft rotates, the second oil pump 22 is once operated to lubricate the crankshaft and the piston P23 until the second oil pump 22 is restarted. Can also be secured.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

Lubricator 1A, 1B, 1C, 1X
1st oil tank 11, 11X
1st oil pump 12, 12X
Second oil tank 21
Second oil pump 22
Oil gallery part 30, 30X
Bypass passage 40
Engine 50, 50X
Cylinder head 51, 51X
Cylinder block 52, 52X
ECU 70A, 70B

Claims (1)

Applied to engines with cylinder head and cylinder block,
An oil gallery that distributes oil;
A first oil tank provided at a lower portion of the engine;
A first oil pump for supplying oil from the first oil tank to the cylinder head without going through the oil gallery;
A second oil tank provided at a height equal to or higher than the cylinder block and collecting oil from the cylinder head;
A second oil pump for supplying oil to the cylinder block by supplying oil from the second oil tank to the oil gallery;
A bypass passage portion for bypassing the cylinder block from the second oil tank to the first oil tank and allowing oil to flow therethrough ,
The second oil pump is an electric oil pump;
When the engine is started and before the crankshaft of the engine is rotated, the second oil pump is operated, and when the operating power of the second oil pump is larger than a predetermined value, An engine lubrication apparatus further comprising a control unit that stops the second oil pump before the crankshaft rotates .

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