JP2014088820A - Lubrication oil supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin gear capable of inhibiting the occurrence of cracks in a tooth root even if a dimension from an inner peripheral part of a gear part to a tooth bottom is not sufficiently secured.SOLUTION: A lubrication oil supply device includes: a trochoid pump 54; a lubrication oil passage part 53 which supplies a lubrication oil discharged from a discharge port of the trochoid pump 54 to a crank journal bearing 11 at an engine; a relief valve 66 where a primary side port communicates with the discharge port of the trochoid pump 54 and the primary side port communicates with a secondary side port according to an internal pressure of the primary side port; a sub lubrication oil passage part 67 which supplies the lubrication oil discharged from the secondary side port of the relief valve 66 to an oil seal 44 attached to a crank shaft 4 at the engine.

Description

  The present invention relates to a lubricating oil supply apparatus.

  2. Description of the Related Art Conventionally, in a lubricating oil supply apparatus that supplies lubricating oil discharged from an oil pump to a crank journal bearing, a second lubricating oil supply passage is provided in the middle of the first lubricating oil supply passage for supplying the lubricating oil to the crank journal bearing. And a part of the lubricating oil flowing into the first lubricating oil supply passage through this second lubricating oil supply passage is supplied to the oil seal attached to the crankshaft, and the oil seal is cooled with the lubricating oil. Lubricating oil supply devices are known (see, for example, Patent Document 1).

JP 2011-137399 A

  However, in the conventional lubricating oil supply device, the amount of lubricating oil supplied increases by the amount of lubricating oil supplied to the oil seal through the second lubricating oil supply passage, the work load of the oil pump increases, and the friction of the oil pump increases. As a result, there has been a problem that the load on the engine, which is the drive source of the oil pump, is increased and there is a concern that the fuel consumption may deteriorate.

  Therefore, an object of the present invention is to provide a lubricating oil supply device that can supply lubricating oil to an oil seal without increasing the work amount of the oil pump as compared with the conventional one.

  In order to achieve the above object, a lubricating oil supply apparatus according to the present invention includes (1) an oil pump, a lubricating oil passage section that supplies lubricating oil discharged from a discharge port of the oil pump to an engine bearing, and 1 The primary side port has a structure having a secondary port and a secondary side port, and further having a pressure interlocking opening / closing passage that communicates between the ports when the pressure in the primary side port becomes higher than a set pressure. Is provided with a relief valve communicated with the discharge port, and a sub-lubricating oil passage portion for supplying the lubricant discharged from the secondary port of the relief valve to an oil seal mounted on the crankshaft of the engine. .

  With this configuration, the lubricating oil supply device structure according to the present invention is configured so that the lubricating oil discharged from the secondary side port of the relief valve is supplied to the oil seal through the auxiliary lubricating oil supply unit, so that the work of the oil pump is reduced. Will not Increase.

  Further, in the lubricating oil supply device according to (1) above, (2) the auxiliary lubricating oil passage portion may be formed inside an engine block constituting the engine.

  With this configuration, in the lubricating oil supply device of the present invention, the lubricating oil discharged from the secondary side port of the relief valve is supplied to the oil seal via the auxiliary lubricating oil supply portion formed inside the engine block. The oil pump work does not increase.

  According to the present invention, it is possible to provide a lubricating oil supply device that can supply lubricating oil to the oil seal without increasing the work of the oil pump as compared with the conventional one.

1 is a schematic configuration diagram of an engine to which a lubricating oil supply device according to an embodiment of the present invention is applied. It is a schematic block diagram of the lubricating oil supply apparatus which concerns on embodiment of this invention. It is a schematic block diagram of the trochoid pump in FIG. 1 and FIG.

  Hereinafter, embodiments of a lubricating oil supply apparatus according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, an engine 1 to which a lubricating oil supply device 5 according to the present embodiment is applied includes a piston 2 housed in a cylinder, a variable valve timing mechanism (hereinafter, VVT). 3), a crankshaft 4, and an engine block 6 including a cylinder block, a cylinder head, and a crankcase.

  The piston 2 constitutes an in-line four-cylinder engine 1 including other three pistons (not shown). The engine 1 is a known internal combustion engine such as a gasoline engine or a diesel engine, and is not limited to an in-line four-cylinder engine, and may be a single cylinder or a multi-cylinder arranged arbitrarily.

  The VVT 3 includes an intake side hydraulic controller that is connected to an intake camshaft (not shown) and drives a vane actuator, and an exhaust side hydraulic controller that is connected to an exhaust camshaft and drives the vane actuator. . The intake-side hydraulic controller and the exhaust-side hydraulic controller are connected to the crankshaft 4 via the chain 31, and are controlled based on the rotational motion of the crankshaft 4.

  The intake camshaft is rotatably supported by the engine block 6 via an intake camshaft journal bearing 13. The exhaust camshaft is rotatably supported by the engine block 6 via an exhaust camshaft journal bearing 14.

  In the chain 31, the tension applied to the chain 31 is adjusted by a chain tensioner 32. In addition, a chain cover 33 is attached to the chain 31 between the intake side hydraulic controller and the exhaust side hydraulic controller and the crankshaft 4 to be protected from the external environment.

  As shown in FIG. 2, the crankshaft 4 includes a crank journal 41, a crank arm 42, and a crankpin 43. The crank journal 41 is rotatably supported by the engine block 6 via a crank journal bearing 11. The crank pin 43 is connected to the piston 2 via the connecting rod 12, and converts the reciprocating motion of the piston 2 into the rotational motion of the crankshaft 4.

  An oil seal 44 is fitted to one end of the crankshaft 4. The oil seal 44 plays a role of preventing the lubricating oil from leaking to the outside of the engine block 6 from the clearance between the outer peripheral portion at one end of the crankshaft 4 and the portion of the engine block 6 through which the crankshaft 4 penetrates. .

  The lubricating oil supply device 5 includes an oil pan 51, an oil strainer 52, a lubricating oil passage portion 53, a trochoid pump 54, an oil filter 55, an oil gallery portion 56, and an oil shower portion 57. ing.

  This lubricating oil supply device 5 is configured to supply lubricating oil to each lubricating portion 10 in the engine 1 via a lubricating oil passage portion in the lubricating oil passage portion 53, and to lubricate and cool each lubricating portion 10. Has been.

  The lubrication unit 10 is a component that requires lubrication in the engine 1, and includes, for example, a piston 2, a crank journal bearing 11, a connecting rod 12, an intake camshaft journal bearing 13, and an exhaust camshaft journal bearing 14. It is comprised including.

  In addition, hydraulic pressure is supplied to the VVT 3, the chain tensioner 32, and the like via a lubricating oil passage portion in the lubricating oil passage portion 53 by an electronic control unit (ECU: Electronic Control Unit) (not shown).

  The ECU includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an EEPROM (Electronically Erasable and Programmable Read Memory Interface, and an output). Yes.

  The ROM is configured to store programs and the like for executing the operations of the VVT 3, the lubricant supply device 5, and the chain tensioner 32. The RAM is configured to temporarily store data. The EEPROM is a rewritable nonvolatile memory that operates using a battery as a power source. The input interface circuit includes an A / D converter, a buffer, and the like. The output interface circuit includes a drive circuit and the like.

  The oil pan 51 is a container for storing lubricating oil recirculated from each lubricating element of the lubricating unit 10, and is attached to the lower part of the crankcase that constitutes the engine block 6. The lubricating oil stored in the oil pan 51 is immersed in the suction port of the oil strainer 52, and the lubricating oil is sucked from the suction port toward the trochoid pump 54.

  The lubricating oil passage portion 53 includes lubricating oil passage portions 53p, 53f, 53g, 53s, 53j, 53c, 53v, and 53t.

  The lubricating oil passage portion 53p is configured to distribute the lubricating oil stored in the oil pan 51 from the oil strainer 52 to the trochoid pump 54. The lubricating oil passage portion 53 f is configured to distribute the lubricating oil discharged from the trochoid pump 54 to the oil filter 55.

  The lubricating oil passage portion 53 g is configured to allow the lubricating oil that has passed through the oil filter 55 to flow into the oil gallery portion 56. The lubricating oil passage portion 53 s is configured to cause the lubricating oil that has passed through the oil gallery portion 56 to flow into the oil shower portion 57.

  The lubricating oil passage portion 53j is configured to supply the lubricating oil flowing into the oil gallery portion 56 to the plurality of intake camshaft journal bearings 13 and the exhaust camshaft journal bearings 14. The lubricating oil passage portion 53 c is configured to supply the lubricating oil flowing into the oil gallery portion 56 to the plurality of crank journal bearings 11.

  The lubricating oil passage portion 53v is configured to supply hydraulic pressure from the oil gallery 56 to the VVT 3. The lubricating oil passage portion 53t is configured to supply hydraulic pressure from the oil gallery 56 to the chain tensioner 32.

  The oil filter 55 includes a case 55c and a filter element accommodated in the case 55c. The filter element plays a role of filtering the lubricating oil about to pass through the case 55c and capturing impurities in the lubricating oil.

  The oil gallery 56 is formed inside the engine block 6, for example, and has a plurality of branch portions configured to divert lubricating oil discharged from the trochoid pump 54 to each lubricating element of the lubricating portion 10. .

  The oil shower unit 57 is configured to release the lubricating oil supplied from the oil gallery unit 56 toward the intake camshaft and the exhaust camshaft.

  The internal space of the engine block 6 and the inner surface of the engine block 6 are also discharged from the oil shower portion 57 and the lubricating oil after being supplied to each lubricating element of the lubricating portion 10 as the lubricating oil passage portion 53. It plays a role of returning the later lubricating oil to the oil pan 51.

  As shown in FIG. 3, the trochoid pump 54 includes an inner rotor 61, an outer rotor 62, and a housing 63.

  The inner rotor 61 has a plurality of external teeth 61s formed on the outer peripheral portion at equal intervals in the circumferential direction. In the outer rotor 62, a plurality of inner teeth 62u are formed in the circumferential direction at equal intervals in the circumferential direction. The number of inner teeth 62u in the outer rotor 62 is set to be one more than the number of outer teeth 61s in the inner rotor 61. The housing 63 is attached to the engine block 6.

  The housing 63 has a rotor storage chamber 63h, a suction port 63i, and a discharge port 63o. The rotor storage chamber 63h is formed to rotatably store the outer rotor 62. The suction port 63i is formed to communicate the outside of the housing 63 and the rotor storage chamber 63h. The discharge port 63o is formed to communicate the rotor storage chamber 63h and the outside of the housing 63.

The suction port 63i in the housing 63 is connected to the downstream end of the lubricating oil passage portion 53p in the lubricating oil flow direction. The discharge port 63o in the housing 63 is connected to the upstream end portion in the lubricating oil flow direction of the lubricating oil passage portion 53f described above.
The

  The outer rotor 62 is rotatably disposed in the rotor storage chamber 63h. The inner rotor 61 is rotatably arranged on the radially inner side of the outer rotor 62, and the inner rotor 61 is eccentric with respect to the outer rotor 62.

A part of the outer teeth 61s of the inner rotor 61 meshes with the inner teeth 62u of the outer rotor 62, and when the inner rotor 61 rotates, the outer rotor 62 also rotates in the same direction.
Since the number of inner teeth 62 u in the outer rotor 62 is set to be one more than the number of outer teeth 61 s in the inner rotor 61, the rotational speed of the outer rotor 62 is lower than the rotational speed of the inner rotor 61.

  One end portion of the drive shaft 64 is coaxially fitted to the inner rotor 61, and spline inner teeth formed on the inner peripheral portion of the inner rotor 61 and spline outer teeth formed on the outer peripheral portion of the one end portion of the drive shaft 64, They are designed to mesh with each other.

  The trochoid pump 54 includes a plurality of oil pressurizing chambers 54p1, 54p2, 54p3 having different volumes between the outer teeth 61s and the inner teeth 62u by the outer teeth 61s of the inner rotor 61, the inner teeth 62u of the outer rotor 62, and the housing 63. Is forming.

  Assuming that the volume of the oil pressurizing chamber 54p1 is V1, the volume of the oil pressurizing chamber 54p2 is V2, and the volume of the oil pressurizing chamber 54p3 is V3, the relationship between the volumes of the oil pressurizing chambers 54p1, 54p2, 54p3 is V1> V2. > V3. That is, the volume of the oil pressurizing chambers 54p1, 54p2, 54p3 located on the downstream side in the rotor rotation direction indicated by the arrow D becomes smaller.

  When the inner rotor 61 and the outer rotor 62 rotate in the direction of arrow D, the lubricating oil is sucked into the oil pressurizing chambers 54p1, 54p2, and 54p3 from the outside of the housing 63 through the suction port 63i. . The lubricating oil is sequentially compressed, and the lubricating oil whose pressure has been increased is discharged to the outside of the housing 63 through the discharge port 63o. In FIG. 3, an arrow L represents the flow of the lubricating oil.

  A gear train 65 is interposed between the trochoid pump 54 and the crankshaft 4 as shown in FIG. The gear train 65 includes a drive gear 65a, an idler gear 65b, and a driven gear 65c.

  The drive gear 65 a is fitted to the other end portion of the crankshaft 4 so as to rotate integrally with the crankshaft 4. The idler gear 65b is supported by the engine block 6 so as to mesh with the drive gear 65a. The driven gear 65 c is fitted to the other end of the drive shaft 64 so as to rotate integrally with the drive shaft 64 of the trochoid pump 54.

  The trochoid pump 54 is accompanied by a relief valve 66. The primary port of the relief valve 66 is configured to communicate with the discharge port 63o of the trochoid pump 54. The relief valve 66 may be integrated with the trochoid pump 54 or may be separate from the trochoid pump 54.

  The characteristic part of the lubricating oil supply device 5 according to the present embodiment is that the lubricating oil discharged from the relief valve 66 is supplied to the oil seal 44 mounted on the crankshaft 4.

  Specifically, as shown in FIG. 2, an auxiliary lubricating oil passage portion 67 is provided between the relief valve 66 and the oil seal 44. The sub lubricating oil passage portion 67 is formed inside the engine block 6.

  The upstream end portion in the lubricating oil flow direction of the auxiliary lubricating oil passage portion 67 is configured to communicate with the secondary port of the relief valve 66, and the downstream end portion in the lubricating oil flowing direction of the auxiliary lubricating oil passage portion 67 is the oil It is configured to open toward the seal 44. Therefore, the auxiliary lubricating oil passage portion 67 is not connected to the lubricating oil passage portion 53 and is independent of the lubricating oil passage portion 53.

  When the pressure of the lubricating oil discharged from the trochoid pump 54 exceeds the operation set pressure of the relief valve 66, the primary side port and the secondary side port of the relief valve 66 communicate with each other. Thereby, a part of the lubricating oil discharged from the trochoid pump 54 is supplied to the oil seal 44 via the relief valve 66 and the auxiliary lubricating oil passage portion 67.

  Next, the operation will be described.

  When the engine 1 is started, the rotational motion of the crankshaft 4 is transmitted to the drive shaft 64 of the trochoid pump 54 via the drive gear 65a, idler gear 65b, and driven gear 65c constituting the gear train 65, and the inner rotor 61 and the outer rotor 62 rotates in the direction of arrow D in FIG.

  When the trochoid pump 54 is driven, the lubricating oil stored in the oil pan 51 is sucked into the trochoid pump 54 through the oil strainer 52 and the lubricating oil passage portion 53p. The lubricating oil discharged from the trochoid pump 54 flows into the oil gallery 56 through the lubricating oil passage portion 53f, the oil filter 55, and the lubricating oil passage portion 53g.

  The lubricating oil flowing into the oil gallery 56 is supplied to the crank journal bearing 11 through the lubricating oil passage portion 53c, and to the intake camshaft journal bearing 13 and the exhaust camshaft journal bearing 14 through the lubricating oil passage portion 53j. Supplied. Thereby, the lubrication parts 10 such as the crank journal bearing 11, the intake camshaft journal bearing 13, the exhaust camshaft journal bearing 14 and the like are lubricated and cooled.

  The pressure of the lubricating oil discharged from the trochoid pump 54 increases as the rotational speed of the engine 1 increases. When the pressure of the lubricating oil discharged from the trochoid pump 54 exceeds the operation set pressure of the relief valve 66, the primary side port and the secondary side port of the relief valve 66 communicate with each other. A part of the discharged lubricating oil is supplied to the oil seal 44 through the relief valve 66 and the auxiliary lubricating oil passage portion 67. As a result, the oil seal 44 is lubricated and cooled.

  The lubricating oil supplied to the oil seal 44 has passed through the relief valve 66. Furthermore, since the auxiliary lubricating oil passage portion 67 is not connected to the lubricating oil passage portion 53 and is independent of the lubricating oil passage portion 53, the auxiliary lubricating oil passage portion 67 is supplied to the crank journal bearing 11 and the like via the oil gallery portion 56. The flow rate does not change in the lubricating oil.

  Therefore, the amount of work of the trochoid pump 54 does not increase by the amount of lubricating oil supplied to the oil seal 44, and the friction of the trochoid pump 54 does not increase. For this reason, the load of the engine 1 which is a drive source of the trochoid pump 54 does not become large, and deterioration of fuel consumption can be avoided.

  In this embodiment, the trochoid pump 54 is used as the oil pump, but other types of pumps may be used instead of the trochoid pump 54.

  As described above, the lubricating oil supply device according to the present invention has an effect that the lubricating oil can be supplied to the oil seal without increasing the work amount of the oil pump, and is useful for various types of vehicle engines.

  DESCRIPTION OF SYMBOLS 1 ... Engine, 4 ... Crankshaft, 5 ... Lubricating oil supply apparatus, 6 ... Engine block, 11 ... Crank journal bearing, 44 ... Oil seal, 53 ... Lubricating oil passage part, 54 ... Trochoid pump (oil pump), 63o ... Discharge port 66 ... Relief valve 67 ... Sub-lubricating oil passage

Claims (2)

An oil pump,
A lubricating oil passage section for supplying lubricating oil discharged from the discharge port of the oil pump to a bearing of the engine;
A structure having a primary side port and a secondary side port, and further having a pressure interlocking open / close passage that communicates between the ports when the pressure in the primary side port becomes higher than a set pressure. A relief valve having a port communicating with the discharge port;
A lubricating oil supply device, comprising: a sub-lubricating oil passage section that supplies lubricating oil discharged from the secondary port of the relief valve to an oil seal mounted on a crankshaft of the engine.   The lubricating oil supply device according to claim 1, wherein the auxiliary lubricating oil passage portion is formed inside an engine block constituting the engine.

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