JP4680794B2 - Oil pump and oil pump lubrication structure - Google Patents

Description

  The present invention relates to an oil pump and an oil pump lubrication structure, and more particularly to a closed structure formed by a tooth portion and a tooth groove by relatively rotating an inner rotor having a tooth portion and an outer rotor having a tooth groove meshing with the tooth portion. The present invention relates to an oil pump that sucks and discharges oil by an insertion portion and a lubricating structure of the oil pump.

  For example, as shown in a cross-sectional view in FIG. 13, a turbocharger disposed in a vehicle engine is configured such that a turbine chamber 101 and a compressor chamber 102 are integrally coupled via a center housing 103, and a turbine wheel 104 in the turbine chamber 101 is connected. And a compressor wheel 105 in the compressor chamber 102 are coupled by a turbine shaft 107 rotatably supported by a compressor wheel side bearing 106a and a turbine wheel side bearing 106b provided in the center housing 103. In the turbocharger 100, the compressor wheel 105 is rotated via the turbine shaft 107 by rotating the turbine wheel 104 by the exhaust gas from the exhaust manifold. The intake air compressed by the rotating compressor wheel 105 is sent to the intake manifold for supercharging.

  Since the turbine shaft 107 of the turbocharger 100 rotates at a high speed and becomes high temperature, it is necessary to sufficiently lubricate and cool the turbine wheel side bearing 106a and the compressor wheel side bearing 106b. An oil seal 119 is disposed at the boundary between the center housing 103 and the turbine chamber 101 and at the boundary between the center housing 103 and the compressor chamber 102.

  Therefore, the oil OL is supplied from an oil inlet 108a that opens to the upper part in the center housing 103, and is supplied to the turbine wheel side bearing 106a and the compressor wheel side bearing 106b through an oil supply passage 109 provided in the center housing 103. Lubricate and cool. The oil OL that has lubricated and cooled the turbine wheel side bearing 106 a and the compressor wheel side bearing 106 b is discharged and recovered from an oil outlet 108 b that opens at the lower portion of the center housing 103.

  When such a turbocharger is mounted on a horizontally opposed engine for vehicles arranged vertically, the center of gravity of the vehicle body is lowered to improve running stability, and each bank, turbocharger, In order to improve the response by omitting the intermediate exhaust pipe interposed between the two and reducing the time lag of the turbocharger, it is known to directly connect the turbocharger directly below the exhaust port, that is, on the lower surfaces of the left and right banks. (For example, refer to Patent Document 1).

  This type of horizontally opposed engine having turbochargers disposed on the lower surfaces of the left and right banks is an oil supply pump (not shown) disposed inside the engine main body 111 as shown in FIG. The oil OL in the oil pan 113 attached directly below the crankcase 112 is sucked up and guided to the gallery in the crankcase 112 and the left and right banks 115L and 115R, and the valve train in the cylinder head 116L of the left bank 115L. The mechanism and the valve operating mechanism in the cylinder head 116R of the right bank 115R are supplied.

  On the other hand, oil OL is supplied to the turbocharger 100R disposed on the lower surface of the right bank 115R and the turbocharger 100L disposed on the lower surface of the left bank 115L through an oil passage branched from the gallery, respectively. Lubricate the superchargers 100R and 100L.

  Oil OL used for lubrication and cooling of the turbochargers 100R and 100L, air pressurized by the turbine wheel 104 in the turbine chamber 101 and air compressed by the compressor wheel 105 in the compressor chamber 102 The high-pressure turbo blow-by gas leaked into the center housing 103 from the gap of the seal portion 119 is located in the turbocharger 100R, 100L below the oil level La of the oil OL in the oil pan 113. After being collected in oil collecting tanks 121R and 121L respectively disposed below the superchargers 100R and 100L, the oil is collected by an oil collecting passage 122 and an oil circulation pump 123 such as a scavenging pump interposed in the oil collecting passage 122. It is sent to the pan 113. Further, the upper portion of the oil collecting tank 121 </ b> L communicates with the crankcase 112 through the pressure adjustment passage 124.

  The oil circulation pump 123 has, for example, a pump housing portion in which a suction port, a discharge port, and a rotor housing portion are formed, and has an outer rotor disposed in the rotor housing portion and a tooth portion that meshes with a tooth groove of the outer rotor. The inner rotor is formed by an internal gear pump that sucks oil OL from the suction port into the rotor housing portion and discharges it from the discharge port afterward by a closed portion formed by a tooth portion and a tooth groove by the relative rotation of the inner rotor.

  Here, when the oil circulation pump 123 is maintained in a stopped state for a relatively long period of time, the oil OL remaining in the oil circulation pump 123 is returned to the oil collection tanks 121R and 121L via the oil recovery passage 122. As a result, the sliding portion between the tooth groove of the outer rotor and the tooth portion of the inner rotor disposed in the rotor housing portion of the oil circulation pump 123 and the sliding portion between the circumferential surface of the rotor housing portion and the outer circumferential surface of the outer rotor are provided. The oil film is not sufficiently formed, resulting in insufficient lubrication, which causes wear and seizure at the portion during restart. In particular, in the type in which the oil collection tanks 121R and 121L are arranged below the left and right banks 115R and 115L and the oil circulation pump 123 is arranged in the cylinder head 116L or 116R, the oil circulation pump 123 and the oil collection tank 121R, The oil collection passage 122 connecting the oil collecting tanks 121R, 121L and the oil pump 123 is relatively long and has a height difference with the oil collecting tank 121R. The oil collecting tank 121R is started from the start of the oil circulation pump 123. , The time lag until the oil OL in 121L is supplied to the oil circulation pump 123 via the oil recovery passage 122 becomes relatively large, and there is a concern that the oil circulation pump 123 may be worn out or seized due to insufficient lubrication.

  Here, as a means for avoiding wear and seizure of the oil pump due to insufficient lubrication when restarting from a stopped state for a relatively long period of time, in the vicinity of the discharge port portion in the pump housing portion housing the outer rotor and the inner rotor. It is known to form a recess that retains a portion of oil when the oil pump is stopped (see, for example, Patent Document 2).

  It is also known to provide a weir-like protrusion that suppresses the return of oil to the suction passage portion so that part of the oil remains in the suction port when the oil pump is stopped (for example, a patent Reference 3).

JP 2003-343274 A JP 9-317423 A Japanese Utility Model Publication 2-37208

  According to the above-mentioned Patent Document 2, by forming a recess in the vicinity of the discharge port portion in which a part of the oil remains in the stop state of the oil pump, the oil remaining in the recess when the restart from the stop state is performed. Can be supplied to. However, it is difficult to hold a sufficient amount of oil in the recessed portion in a stopped state for a long period of time, and the sliding portion between the outer rotor tooth groove and the inner rotor tooth portion, the inner peripheral surface of the rotor accommodating portion, and the outer rotor A sufficient oil film cannot be held in the sliding portion between the outer peripheral surface of the oil pump and there is a concern that the oil pump is worn or seized when restarting.

  On the other hand, in Patent Document 3, it is difficult to hold a sufficient amount of oil by a weir-shaped protrusion over a long-term stop state as in Patent Document 2, and a weir-shaped protrusion is formed on the suction port portion. Therefore, when the inner rotor is rotated in a relatively high rotation range, the flow of oil introduced into the suction port is throttled by the protrusions, which causes cavitation and affects the performance of the oil pump. Is concerned.

  Therefore, the object of the present invention made in view of such points is to prevent the occurrence of wear and seizure of each part at the start by ensuring the oil for lubrication quickly and sufficiently at the start of the oil pump, Another object of the present invention is to provide an oil pump and an oil pump lubrication structure that can ensure stable performance.

The oil pump according to claim 1, which achieves the above object, includes an outer rotor having a tooth groove on an inner periphery thereof, an inner rotor having a tooth portion that meshes with the tooth groove and forms a confining portion between the outer rotor, and the outer rotor. And a rotor housing portion that rotatably holds and accommodates the inner rotor, a suction port that introduces oil into the closing portion, and a pump housing portion that has a discharge port that discharges oil sent by the closing portion. In the oil pump, the pump housing portion has a pump housing member having the rotor housing portion that opens to the first joint surface, and a second joint surface that can be joined to the first joint surface, and the rotor housing portion. A pump cover member that closes the opening of the pump cover, an oil introduction groove formed on the second joint surface of the pump cover member, and a port joined to the second joint surface. Formed by the first joint surface of the flop housing member, characterized by comprising a an oil introduction passage for introducing the oil to be pumped into the rotor accommodating portion by the oil pumping means.

The oil pump according to claim 2, which achieves the above object, includes an outer rotor having a tooth groove on an inner periphery, an inner rotor having a tooth portion that meshes with the tooth groove and forms a closed portion between the outer rotor, and the outer rotor. And a rotor housing portion that rotatably holds and accommodates the inner rotor, a suction port that introduces oil into the closing portion, and a pump housing portion that has a discharge port that discharges oil sent by the closing portion. In the oil pump, the pump housing portion includes an oil introduction passage for introducing the oil pumped by the oil pumping means into the rotor housing portion, and the oil introduction passage and the confinement portion are intermittently communicated. Thus, oil is intermittently introduced into the confinement part .

According to a third aspect of the present invention, in the oil pump according to the first or second aspect , the oil introduction passage communicates with the suction port or the discharge port through the rotor housing portion .

According to a fourth aspect of the present invention, in the oil pump according to any one of the first to third aspects, the oil introduction passage is formed by a tooth groove of the outer rotor and a tooth portion of the inner rotor that mesh with each other. Oil is introduced into the rotor accommodating portion corresponding to the insertion portion .

According to a fifth aspect of the present invention, in the oil pump according to any one of the first to third aspects, the oil introduction passage corresponds between a bottom circle of the outer rotor and a bottom circle of the inner rotor. Oil is introduced into the rotor accommodating portion .

According to a sixth aspect of the present invention, in the oil pump according to any one of the first to fifth aspects, the suction port and the discharge port include an outer rotor and / or a closed portion in communication with the oil introduction passage. The inner rotor is held in a non-communication state.

According to a seventh aspect of the present invention, in the oil pump according to the second aspect, the pump housing portion is joined to the pump joint member that accommodates the rotor portion that opens to the first joint surface, and the first joint surface. A pump cover member that has a possible second joint surface and closes the opening of the rotor accommodating portion, and the oil introduction passage is a first joint surface of the pump housing member or a second joint of the pump cover member. An oil introduction groove formed in the surface, an oil introduction groove formed in the inner rotor, and a second surface of the pump cover member are formed .

According to an eighth aspect of the present invention, in the oil pump according to the second aspect, the pump housing portion is joined to the first joint surface with a pump housing member having the rotor accommodating portion that opens to the first joint surface. A pump cover member having a possible second joint surface and closing the opening of the rotor accommodating portion, wherein the oil introduction passage is formed in the second joint surface of the pump cover member, and one end of the outer rotor It is characterized in that it is formed by an oil introduction groove extending between a tooth tip circle and a root circle of the outer rotor, and a first joint surface of a pump housing member joined to the second joint surface .

According to a ninth aspect of the present invention, there is provided a lubricating structure for an oil pump , wherein the oil pump according to any one of the first to eighth aspects guides oil pumped from an oil supply pump that operates when the engine is started. And the oil pump is driven by a camshaft of the valve mechanism, and an oil introduction passage communicates with the gallery .

An oil pump lubrication structure according to a tenth aspect of the present invention is a gallery in which the oil pump according to any one of the first to eighth aspects guides oil fed by pressure from an oil supply pump that operates when the engine is started. The oil introduction passage is communicated with the gallery, and the suction port is communicated with the oil collection tank disposed below the oil pump via the oil suction passage. It is characterized by that.

According to an eleventh aspect of the present invention, in the oil pump lubrication structure according to the ninth or tenth aspect, the oil introduction passage communicates with the gallery via an orifice .

According to the first aspect of the present invention, the pump housing part can be constituted by the pump housing member having the first joint surface and the pump cover member having the second joint surface, and the oil introduction groove is formed in the second joint surface. With this simple configuration, an oil introduction passage for introducing oil pumped by the oil pumping means into the rotor housing portion can be formed by the first joint surface of the pump housing member and the second joint surface of the pump cover member . Therefore, when starting the oil pump , the oil from the oil pressure feeding means is instantaneously supplied into the rotor accommodating portion via the oil introduction passage, and the sliding portions such as the outer rotor and the inner rotor in the rotor accommodating portion are quickly lubricated after starting. Thus, wear and seizure of each part at the start can be prevented. Furthermore, unlike the Patent Document 1 and Patent Document 2, it is not necessary to provide a recess or a dam-like protrusion that retains oil in a stopped state in the vicinity of the discharge port or in the suction port, thereby ensuring stable performance of the oil pump. . Furthermore, the oil supplied from the oil pressure feeding means through the oil introduction passage into the rotor accommodating portion serves as a priming water, and the suction performance at the start can be ensured.

According to the invention of claim 2, by providing the oil introduction passage for introducing the oil pumped by the oil pumping means into the rotor housing portion, when starting the oil pump, the oil from the oil pressure feeding means passes through the oil introduction passage. Thus, the sliding parts such as the outer rotor and the inner rotor in the rotor accommodating part are lubricated promptly after starting, and the occurrence of wear and seizure of each part during starting can be prevented. In particular, since the oil introduction passage and the closed portion are intermittently communicated, oil is intermittently introduced into the closed portion, so that the amount of oil supplied into the oil pump can be reduced. Therefore, it is possible to suppress a reduction in the suction efficiency of the oil pump while ensuring sufficient and sufficient oil for lubrication. Furthermore, the oil supplied from the oil pressure feeding means through the oil introduction passage into the rotor accommodating portion serves as a priming water, and the suction performance at the start can be ensured.

According to the invention of claim 3, since the oil introduction passage communicates with the suction port or the discharge port via the rotor housing portion, the oil supplied from the oil introduction passage directly to the suction port side or the discharge port side. Since the oil supplied from the oil introduction passage is supplied to the suction port side and the discharge port side via the inside of the rotor housing portion without being supplied, it is possible to reliably lubricate the outer rotor and the inner rotor side in the rotor housing portion. it can.

According to the invention of claim 4, oil from the oil introduction passage can be introduced into the closed portion formed by the tooth groove of the outer rotor and the tooth portion of the inner rotor, and between the tooth groove of the outer rotor and the tooth portion of the inner rotor. Oil can be reliably supplied to the sliding portion.

According to the fifth aspect of the present invention, the oil from the oil introduction passage is introduced into the rotor accommodating portion correspondingly between the root circle of the outer rotor and the root circle of the inner rotor, so that the tooth gap of the outer rotor and the teeth of the inner rotor are obtained. The oil can be reliably supplied to the closed portion formed by the portion, and the oil can be reliably supplied to the sliding portion between the tooth groove of the outer rotor and the tooth portion of the inner rotor.

  According to the sixth aspect of the present invention, the closed portion in communication with the oil introduction passage, the suction port and the discharge port are brought into non-communication by the outer rotor and / or the inner rotor, so that the oil introduction passage is introduced into the closed portion. The oil can stay in the confinement part, and the gap between the outer rotor tooth gap and the inner rotor tooth part can be reliably lubricated.

According to the invention of claim 7, the oil introduction passage is provided with an oil introduction groove formed in the first joint surface of the pump housing member or the second joint surface of the pump cover member, an oil introduction groove formed in the inner rotor, and the pump. By comprising with the 2nd junction surface of a cover member, the oil introduction channel | path which communicates with a closed part intermittently can be formed.

According to the eighth aspect of the present invention, the pump housing member includes a pump housing member having a rotor accommodating portion in which an opening is formed on the first joint surface, and an outer rotor having one end on the second joint surface that can be joined to the first joint surface. And a pump cover member having an oil introduction groove extending between the tooth tip circle and the bottom circle of the outer rotor and closing the opening of the rotor housing portion, thereby the first joint surface of the pump housing member By joining the second joint surface of the pump cover member, an oil introduction passage that intermittently communicates with the confinement portion can be formed.

According to invention of Claim 9, it arrange | positions at the side of the cylinder head provided with the gallery which guides the oil pumped from the oil supply pump which operate | moves with engine start, and the valve operating mechanism, Driven and the oil introduction passage communicates with the gallery, so that the oil pressure-fed from the oil supply pump can be supplied into the rotor accommodating portion through the gallery and the oil introduction passage immediately after the engine is started. In addition, the outer rotor, the inner rotor, and the like in the rotor accommodating portion are lubricated to prevent the wear and seizure of each portion at the start.

According to invention of Claim 10, it arrange | positions at the side surface of the cylinder head provided with the gallery which guides the oil pumped from the oil supply pump which operate | moves with engine start, and a valve mechanism, and an oil introduction channel | path communicates with a gallery. The oil pumped from the oil supply pump can be supplied to the rotor housing portion via the gallery and the oil introduction passage immediately after the engine is started, and the sliding portions such as the outer rotor and the inner rotor in the rotor housing portion can be quickly supplied after the start. Since there is a time lag from the start of the oil pump until the oil collection tank disposed below the oil pump is supplied to the rotor housing portion through the oil suction passage, the oil pump Can prevent wear and seizure.

According to the invention of claim 11, since the oil introduction passage communicates with the gallery through the orifice, it is possible to prevent the oil pressure in the gallery from being excessively reduced and the oil in the gallery gradually increases even after the engine is stopped. To the rotor housing.

  Hereinafter, a first embodiment of an oil pump according to the present invention will be described with reference to FIGS. 1 to 7 by taking an oil circulation pump arranged in a horizontally opposed engine for vehicles arranged vertically as an example. Note that the turbochargers 100L and 100R in each embodiment have substantially the same configuration as the turbocharger 100 shown in FIG. 13, and a detailed description thereof will be omitted.

  1 is a partially sectional front view showing an outline of a horizontally opposed engine, FIG. 2 is an explanatory diagram schematically showing, FIGS. 3 to 6 are explanatory diagrams of an oil circulation pump, and FIG. 7 is an oil system diagram. is there.

  As shown in FIGS. 1 and 2, the engine 10 is provided with left and right banks 13 </ b> L and 13 </ b> R in a crankcase 12 disposed in the center of the engine body 11. An oil pan 15 serving as an oil storage portion is attached immediately below the crankcase 12, and a pair of turbochargers 100L and 100R are disposed on the lower surfaces of the left and right banks 13L and 13R so as to be separated from each other. The turbochargers 100L and 100R are located below the oil level La of the oil OL in the oil pan 15.

  An oil supply pump 21 that operates when the engine 10 is started is disposed inside the engine body 11, and the oil OL in the oil pan 15 is sucked through the oil strainer 22 and the oil suction passage 23 on the suction side of the oil supply pump 21. The oil OL is sent from the oil gallery in the engine body 11 to each lubrication part, and part of the oil OL is branched to lubricate and cool the turbochargers 100L and 100R. An oil lubrication system path for feeding oil to the inlet 108a is formed.

  An oil outlet 108b that opens to the lower part of the center housing 103 of the left turbocharger 100L communicates with the upper part of the oil collecting tank 17L via the oil drain communication path 16L, and the center housing of the right turbocharger 100R. An oil outlet 108b that opens to the lower part of 103 communicates with the upper part of the oil collecting tank 17R via the oil drain communication path 16R, and between the lower parts of the left and right oil collecting tanks 17L and 17R on the center side in the vehicle body width direction. The communication path 28 communicates. The communication passage 28 prevents movement of the oil OL from the oil collecting tank 17L side to the oil collecting tank 17R side, while moving the oil OL from the oil collecting tank 17R side to the oil collecting tank 61L side. Is provided.

  The lower part of the left oil collecting tank 17L communicates with a suction port 47 of an oil circulation pump 31, which is an oil pump, via an oil suction passage 29, and a discharge port 42 of the oil circulation pump 31 is formed in the cylinder head 14L. It communicates with the oil pan 15 via a camshaft hole 14b serving as a discharge passage and a drain passage (not shown) formed in the bank 13L. The upper portion of the oil collecting tank 17L communicates with the crankcase 12 that is always maintained at a positive pressure by the pressure adjusting pipe 27.

  The oil circulation pump 31 is disposed in the cylinder head 14L of the left bank 13L, is connected to a camshaft of a valve mechanism 65L disposed in the cylinder head 14L so as to be able to transmit power, and is driven by rotation of the camshaft. .

  An outline of the oil circulation pump 31 will be described with reference to FIGS. 3 is a diagram showing an outline of the oil circulation pump 31, FIG. 4 is a sectional view taken along the line II in FIG. 3, FIG. 5 is a sectional view taken along the line II-II in FIG. FIG.

  The oil circulation pump 31 is an inscribed gear pump, and one end of the oil circulation pump 31 is coupled to the camshaft 65La of the valve operating mechanism 65L so that power can be transmitted, and the other end of the drive shaft 32 is coupled. An inner rotor 33, an outer rotor 34, and a pump housing portion 35 in which a rotor housing portion 41 for housing the inner rotor 33 and the outer rotor 34 is formed. The pump housing portion 35 is formed of a pump housing member 36 and a pump cover member 45. .

  As shown in FIGS. 3 and 4, the pump housing member 36 has a plate-like base portion 37 attached to the side surface 14 a of the cylinder head 14 </ b> L in contact with the side surface 14 a, and projects from the base portion 37 into a bottomed cylindrical shape. A drive shaft hole 39 through which the drive shaft 32 passes is formed at the center of the protrusion 38. The drive shaft 32 has a protrusion 38 that fits into the hole 14 b. An oil hole 40 communicating with a gallery 68 opened on the side surface 14a of the cylinder head 14L is formed in the base portion 37. The oil hole 40 is provided with an orifice 40a (see FIG. 7).

  Further, the pump housing member 36 is formed with a rotor accommodating portion 41 that opens on the first joint surface 37b of the base portion 37 and has a peripheral surface 41a and a bottom surface 41b, and a drive shaft hole 39 is continuously formed on the bottom surface 41b. . A discharge port 42 that communicates from the bottom surface 41 b of the rotor accommodating portion 41 to the tip of the protrusion 38 is formed.

  In the end surface 37a of the base portion 37, annular seal grooves 43a and 43b for receiving seal members (not shown) are provided along the outer periphery of the protrusion 38 and the outer periphery of the oil hole 40, respectively. Further, the base portion 37 is provided with a plurality of oil pump mounting holes 44a and cover mounting bolt holes 44b for fixing to the cylinder head 17L.

  The pump cover member 45 is a plate shape following the shape of the base portion 37 of the pump housing member 36, and has a base portion 46 having a second joint surface 46 b that can be joined to the first joint surface 37 b of the base portion 37 of the pump housing member 36. In addition, a suction port 47 communicating with the outside from a portion of the second joint surface 46b corresponding to the rotor accommodating portion 41 formed in the pump housing member 36 is formed. Details of the discharge port 42 and the suction port 47 will be described later.

  Further, the second joint surface 46 b of the base portion 46 accommodates a rotor housing portion 41 formed on the pump housing member 36 and an annular member that houses a seal member 48 that contacts the first joint surface 37 b along the outer periphery of the oil hole 40. The seal groove 48a is recessed. Further, the second joint surface 46b includes a bottom circle of the outer rotor 34 accommodated in the rotor accommodating portion 41 from the center of the oil hole 40 of the oil housing member 36, as shown in FIGS. An oil introduction groove 50 a that continues to the corresponding position between the inner rotor 33 and the root circle is formed. An oil pump mounting hole 49a and a screw hole 49b are formed in the base portion 46 corresponding to the oil pump mounting hole 44a and the cover mounting bolt hole 44b, respectively.

  The bolt 52 is inserted from the cover mounting bolt hole 44b with the first joint surface 37b of the base portion 37 formed on the pump housing member 36 and the second joint surface 46b of the base portion 46 of the pump cover member 45 facing each other. Then, the pump cover member 45 is attached to the pump housing member 36 by being screwed into the screw hole 49b, and the opening of the rotor accommodating portion 41 formed in the pump housing member 36 is closed by the pump cover member 45. Is formed. In the housing part 35 configured in this way, the oil introduction passage 50, the suction port 47, and the discharge port 42 do not communicate directly with each other, but communicate with each other via the rotor housing part 41.

  The inner rotor 33 has a shaft hole 33b that is fitted to the other end of the drive shaft 32 and fixed coaxially, and a plurality of, for example, six tooth portions 33a are formed on the outer periphery along the circumferential direction at equal intervals. ing. The tooth profile of the tooth portion 33a is formed, for example, as a trochoidal tooth profile.

  The outer rotor 34 is rotatably disposed in the rotor accommodating portion 41 of the pump housing member 36 with a predetermined amount of eccentricity with respect to the central axis of the inner rotor 33, and the outer circumferential surface 34 b of the outer rotor 34 is accommodated in the rotor. The movement in the axial direction is regulated by being slidably fitted to the peripheral surface 41 a of the portion 41, and both end surfaces are slidable on the bottom surface 41 b of the rotor accommodating portion 41 and the second joint surface 46 a of the pump cover member 45. It is regulated by abutting on. On the inner periphery of the outer rotor 34, a plurality of, for example, seven tooth grooves 34a that mesh with the teeth 33a of the inner rotor 33 are formed at equal intervals in the circumferential direction. When the inner rotor 33 is rotated in the direction of the arrow, the outer rotor 34 rotates in the rotor accommodating portion 41 relatively in the same direction as the inner rotor 33 rotates.

  A plurality of confinement portions 51 are formed by a space surrounded by the tooth groove 34 a of the outer rotor 34 and the adjacent tooth portions 33 a of the inner rotor 33, and the volume of each confinement portion 51 is changed by the rotation of the inner rotor 33. One end communicates with the oil introduction hole 40 by the oil introduction groove 50a formed in the second joint surface 46a of the oil cover member 45, the first joint surface 37b of the pump housing member 36, and the side surface portion of the outer rotor 34, and the other end is closed. An oil introduction passage 50 communicating with the insertion portion 51 is formed. On the side where the volume of the confining portion 51 increases, the confining portion 51 does not communicate with the confining portion 51 communicating with the oil introduction hole 40 through the oil introduction passage 50. That is, the inner rotor 33 and the outer rotor 34 cause the confinement portion 51 to communicate with each other. The suction port 47 of the pump cover member 45 is opened corresponding to the part that is in a non-communication state. On the other hand, on the side where the volume of the confining portion 51 is reduced, and the portion not communicating with the confining portion 51 communicating with the oil introduction hole 40 through the oil introduction passage 50, that is, the inner rotor 33 and the outer rotor 34 perform the confinement. The discharge port 42 of the pump housing member 36 is opened corresponding to a portion that is not in communication with the portion 51.

  The oil circulation pump 31 configured as described above is connected to the side surface 14a of the cylinder head 14L, the protrusion 38 is inserted into the camshaft hole 14b, and the drive shaft 32 is connected to the camshaft so as to be able to transmit power, and is used for oil pump attachment. It is attached by mounting bolts 54 inserted into the holes 44a and 49a and screwed into the screw holes 14c formed in the side surface 14a of the cylinder head 14L. An oil suction passage 29 is connected to the suction port 47.

  The oil supply to each part of the oil OL will be described with reference to the oil system diagram shown in FIG. The oil OL in the oil pan 15 is sucked through the oil strainer 22 and the oil suction passage 23 by the operation of the oil supply pump 21 disposed in the engine body 11 by the operation of the engine, and the oil temperature is reduced by the oil cooler 60. It is optimized and guided to the left and right main galleries 61L and 61R on the crankcase 12 side.

  The oil OL supplied to the left main gallery 61L lubricates the crankshaft portion 63L, branches off from the main gallery 61L, and is sent to the valve mechanism 65L via the gallery 64L to lubricate the valve mechanism 65L. And collected in the oil pan 15. Further, oil OL is supplied to the oil communication passage 67L through the gallery 66L branched from the gallery 64L in the cylinder head 14L, and the turbocharger 100L is supplied from the oil inlet 108a of the left turbocharger 100L through the oil passage 67L. The oil OL lubricated and cooled by the turbine wheel side bearing 106a and the compressor wheel side bearing 106b is discharged from the oil outlet 108b to the oil collecting tank 17L through the oil drain communication path 16L.

  The gallery 68 branches from the gallery 64L, and the gallery 68 communicates with the oil introduction hole 40 of the oil circulation pump 31 through the orifice 40a. By restricting the amount of oil pumped to the oil introduction hole 40 side of the oil circulation pump 31 by the orifice 40a, the oil amount and oil pressure supplied to the valve operating mechanism 65L and the turbocharger 100L side are secured. .

  The oil OL supplied to the right main gallery 61R lubricates the crankshaft portion 63R, branches off from the main gallery 61R, and operates through the gallery 64R disposed in the cylinder head 14R of the right bank 13R. And is collected in the oil pan 15. Further, the oil OL is supplied to the oil communication passage 67R through the gallery 66R branched from the gallery 64R in the cylinder head 14R, and the turbocharger 100R is supplied from the oil inlet 108a of the right turbocharger 100R through the oil passage 67R. The oil OL lubricated and cooled by the turbine wheel side bearing 106a and the compressor wheel side bearing 106b is recovered from the oil outlet 108b to the right oil collecting tank 17R through the oil drain communication path 16R.

  Here, in the left and right turbochargers 100 </ b> L and 100 </ b> R, the air pressurized by the turbine wheel 104 in each turbine chamber 101 and the air pressurized by the compressor wheel 105 in the compressor chamber 102 are gaps between the seal portions 119. The turbo blow-by gas leaked into the center housing 103 from the high pressure is discharged from the oil drain communication passages 16L and 16R at high pressure into the left and right oil collection tanks 17L and 17R, and the oil collection tanks 17L and 17R. Pressurize the inside. On the other hand, the oil collection tank 17L on the left side is a crankcase 12 that is a part of an oil lubrication system path lower than the discharge pressure of the turbo blow-by gas discharged from the oil drain communication passages 16L, 16R to the oil collection tanks 17L, 17R. The pressure adjustment pipe 14L communicates with the pressure reduction pipe 14L to reduce the pressure, and the pressure in the left oil collection tank 17L is lower than that in the right oil collection tank 17R.

  Due to the pressure difference between the internal pressure of the right oil collection tank 17R and the internal pressure of the left oil collection tank 17L, the oil OL and blow-by gas in the right oil collection tank 17R are connected to the left oil via the communication passage 28. Sequentially pumped to the collection tank 17L side.

  The oil OL and turbo blow-by gas pumped from the right oil collecting tank 17R to the left oil collecting tank 17L and the oil and turbo blow-by gas supplied from the turbocharger 100L to the oil collecting tank 17L are The turbo blow-by gas is supplied into the crankcase 12 through the pressure adjusting pipe 27 from the upper part of the oil collecting tank 17L.

  On the other hand, as the engine is operated, the drive shaft 32 of the oil circulation pump 31 connected to the camshaft 65La of the valve mechanism 65L that is rotationally driven is rotatively driven, and the teeth 33a of the inner rotor 33 that rotates with each other. And the oil in the oil collection tank 17L is sucked from the suction port 47 through the oil suction passage 29 by the closing portion 51 formed by the tooth groove 34a of the outer rotor 34, and the camshaft hole of the cylinder head 14L is discharged from the discharge port 42. 14b and is collected into the oil pan 15 through the camshaft hole 14b.

  When the engine 10 is stopped for a relatively long period of time after the engine 10 is in the operating state in this way, the oil is caused by the difference in height between the oil circulation pump 31 and the oil collecting tank 17L. Oil OL remaining in the rotor accommodating portion 41 of the circulation pump 31 is returned from the suction port 47 through the oil suction passage 29 to the oil collecting tank 17L, and from the discharge port 42 to the oil pan 15 through the camshaft hole 14b. The sliding portion between the tooth portion 33a of the inner rotor 33 and the tooth groove 34a of the outer rotor 34 in the rotor accommodating portion 41 and the sliding between the inner peripheral surface 41a of the rotor accommodating portion 41 and the outer peripheral surface of the outer rotor 34 are obtained. The oil film formed on the part may not be sufficiently secured.

  Here, when the engine 10 is restarted from a long-term stopped state, the drive shaft 32 of the oil circulation pump 31 is rotationally driven by the camshaft 65La of the valve mechanism 65L that is rotationally driven as the engine 10 starts. Then, the inner rotor 33 and the outer rotor 34 are rotated, and the oil circulation pump 31 is also started. On the other hand, when the engine 10 is started, the oil supply pump 21 is operated in the same manner as described above, and the oil OL is guided to the gallery 64L, 64R in the crankcase 12 and the left and right main gallery 61L, 61R, and the banks 13L, 13R. Oil OL is supplied to the shaft parts 63L and 63R and the valve mechanisms 65L and 65R to lubricate them, and is supplied to the oil introduction hole 40 of the oil circulation pump 31 via the gallery 68 branched from the gallery 64L instantly after restart. Oil is supplied from the oil introduction hole 40 to the bottom circle of the inner rotor 33 accommodated in the rotor accommodating portion 41 via the oil introduction passage 50 and the bottom circle of the outer rotor 34, in other words, the teeth of the inner rotor 33. The oil O is directly applied to the closed portion 51 formed by the tooth groove 34a of the outer rotor 34 and the portion 33a. Is supplied and stays in the closed portion 51, and is reliably introduced into the sliding portion between the tooth portion 33a of the inner rotor 33 and the tooth groove 34a of the outer rotor 34 by the oil OL staying and holding in the closed portion 51. Lubricate the part. The oil OL introduced into the confining portion 51 is introduced into the sliding portion between the outer rotor 34 and the outer peripheral surface 41a and the bottom surface 41b of the rotor storage portion 41 by the rotation of the inner rotor 33 and the outer rotor 34, and the outer rotor 34 and the pump cover member. 45 is introduced into the sliding portion with the joint surface 46b.

  After that, the oil OL in the oil collection tank 17L is transferred from the suction port 47 through the oil suction passage 29 by the closing portion 51 formed by the tooth portion 33a of the inner rotor 33 and the tooth groove 34a of the outer rotor 34 that rotate with each other. It is sucked into the accommodating portion 40, sent from the discharge port 42 into the camshaft hole 14b of the cylinder head 14L, and collected into the oil pan 15 from the camshaft hole 14b.

  As a result, when restarting from the stopped state, the oil OL in the oil collecting tank 17L is instantaneously immediately after restarting before being introduced into the rotor accommodating portion 41 from the suction port 47 via the oil suction passage 29. The sliding portion between the tooth portion 33a of the inner rotor 33 and the tooth groove 34a of the outer rotor 34 and the outer peripheral surface 34b of the outer rotor 34 are obtained by the oil OL supplied into the rotor accommodating portion 41 from the 68 through the oil introduction passage 50. An oil film is reliably formed on the sliding portion between the rotor and the peripheral surface 41a of the rotor accommodating portion 41. As a result, it is possible to reliably prevent wear and seizure of the sliding portions related to the inner rotor 33 and the outer rotor 34 at the time of restart. Furthermore, immediately after restarting, the oil OL supplied from the gallery 68 through the oil introduction passage 50 into the rotor accommodating portion 41 becomes priming water, and it is possible to ensure the suction performance immediately after restarting.

  Therefore, according to the present embodiment, the oil pumped from the oil supply pump 21 is supplied into the rotor accommodating portion 41 of the oil circulation pump 31 via the gallery 68 and the oil introduction passage 50 immediately after the engine is started. Even if there is a time lag until the oil in the oil collection tanks 17L, 17R disposed below the oil circulation pump 31 is supplied to the rotor accommodating portion 41, the outer rotor in the rotor accommodating portion 41 can be quickly provided after starting. The sliding parts such as 33 and the inner rotor 34 are lubricated to prevent wear and seizure of each part at the start. At this time, the oil introduction passage 50 communicates with the suction port 47 and the discharge port 42 through the rotor accommodating portion 41, and the closed portion 51, the suction port 47, and the discharge port 42 in communication with the oil introduction passage 50 are connected to each other. Coupled with being kept out of communication by the outer rotor 34 and the inner rotor 33, the oil supplied from the oil introduction passage 50 is not directly supplied to the suction port 47 or the discharge port 42 side, but the oil introduction The oil from the passage 50 stays in the rotor accommodating portion 41 and can be reliably supplied to the sliding portion between the tooth groove 34 a of the outer rotor 34 and the tooth portion 33 a of the inner rotor 33. In particular, by introducing the oil from the oil introduction passage 50 into the rotor accommodating portion 41 correspondingly between the bottom circle of the outer rotor 34 and the bottom circle of the inner rotor 33, in other words, the oil from the oil introduction passage 50. Can be introduced into the closed portion 51 formed by the tooth groove 34 a of the outer rotor 34 and the tooth portion 33 a of the inner rotor 33, and the sliding portion between the tooth groove 34 a of the outer rotor 34 and the tooth portion 33 a of the inner rotor 33 can be introduced. Oil can be reliably supplied.

  Further, since the oil introduction passage 50 communicates with the gallery 68 through the orifice 40a, the oil pressure in the gallery 68 can be prevented from excessively decreasing, and the oil in the gallery 68 is gradually reduced even after the engine is stopped. The oil is supplied to the rotor accommodating portion 41 and good oil pump pump lubrication is maintained.

  Next, an oil pump according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 8 is an explanatory diagram of the oil circulation pump, and FIG. 9 is a sectional view taken along line IV-IV in FIG. The same members as those shown in FIGS. 3 and 4 are denoted by the same reference numerals and description thereof is omitted.

  The oil circulation pump 231 has the same configuration as the oil circulation pump 31 of the above-described embodiment except that the configuration of the oil introduction passage 250 is different. The oil introduction passage 250 includes an oil introduction groove 250 a formed in the base portion 237 of the pump housing member 36, an oil introduction groove 250 b formed in the outer rotor 234, and a second joint surface 46 a of the pump cover member 45. Yes. The oil introduction groove 250 a is formed in the first joint surface 37 b of the base member 237, and one end communicates with the oil introduction hole 40 and the other end communicates with the peripheral surface 41 a of the rotor accommodating portion 41. On the other hand, the oil introduction groove 250 b is formed in a substantially U-shaped cross section on the side surface of the outer rotor 234, that is, the side surface 34 c on the side corresponding to the second joint surface 46 a of the pump cover member 45, and one end thereof is the circumferential surface 41 a of the rotor housing portion 41. The other end communicates with the closing portion 51 from the inner peripheral surface 34d of the outer rotor.

  According to the oil introduction passage 250 configured as described above, the oil can be intermittently supplied to the rotor accommodating portion as the outer rotor 234 rotates. In other words, when the outer rotor 234 is located at a position where the opening on the peripheral surface 41a side of the oil introduction groove 250b communicates with the oil introduction groove 250a, the oil supplied from the oil hole 40 to the oil circulation pump 231 is the oil introduction groove 250a. , 250b, and the oil introduction groove 250b is supplied to the confinement part 51 in communication. On the other hand, as shown in FIG. 8, when the opening on the outer peripheral surface 34b side of the oil introduction groove 250b is closed by the peripheral surface 41a of the rotor accommodating portion 41, the oil supplied from the oil hole 40 to the oil circulation pump 231 is oil. It remains in the introduction groove 250a and is not supplied to the rotor accommodating portion 41.

  Therefore, according to the second embodiment, the oil hole 40 and the confinement part 51 are intermittently communicated via the oil introduction passage 250, and the oil is intermittently introduced into the rotor accommodating part 41 of the oil circulation pump 231. By supplying the oil, the amount of oil supplied into the oil circulation pump 231 can be suppressed to a small amount, so that it is possible to suppress the reduction in the suction efficiency of the oil circulation pump 231 while securing the oil for lubrication quickly and sufficiently. it can.

  The amount of oil supplied to the rotor accommodating portion can be appropriately adjusted by changing the shape of the oil introduction passage 250 or increasing or decreasing the number of oil introduction grooves 250b formed in the outer rotor 234. Moreover, although the example which formed the oil introduction groove | channel 250a in the 1st joining surface 37b of the base part 237 was shown, not only this but forming in the 2nd joining surface 46a of the oil cover member 45, or an oil introduction | transduction The groove 250 a may be formed on both the first joint surface 37 b of the base portion 237 and the second joint surface 46 a of the oil cover member 45. Further, although the oil introduction groove 250b is provided on the side surface 34c of the outer rotor 234, the oil introduction groove 250b may be formed so as to penetrate the outer peripheral surface and the inner peripheral surface of the outer rotor.

  Next, an oil pump according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 10 is an explanatory diagram of the oil circulation pump, and FIG. 11 is a cross-sectional view taken along the line VV of FIG. The same members as those shown in FIGS. 3 and 4 are denoted by the same reference numerals and description thereof is omitted.

  The oil circulation pump 331 has the same configuration as the oil circulation pump 31 of the above-described embodiment except that the configuration of the oil introduction passage 350 is different. The oil introduction passage 350 includes an oil introduction groove 350a formed on the second joint surface 46a of the pump cover member 45 and a first joint surface 37b of the pump housing member 35, one end communicating with the oil introduction hole 40 and the other end. Communicates with the confinement part 51.

  The oil introduction passage 50 and the oil introduction passage 350 are different in the position of the end portion of the oil introduction passage on the closed portion 51 side. The end of the oil introduction passage 50 on the closed portion 51 side is between the bottom circle of the outer rotor 34 and the bottom circle of the inner rotor 33, strictly speaking, between the top circle of the outer rotor 34 and the bottom circle of the inner rotor 33. Is located. On the other hand, the end portion of the oil introduction passage 350 on the closed portion 51 side is located between the root circle and the tip circle of the outer rotor 34.

  As in the case of the oil introduction passage 50, if the oil introduction passage is formed so that the end portion of the oil introduction passage on the side of the closing portion 51 is located on the center side from the tip circle of the outer rotor, the oil introduction passage is closed. Since the portion where the end portion on the side of the portion 51 is not blocked by the side surface 34c of the outer rotor is secured, oil can be supplied almost always to the rotor accommodating portion 41. On the other hand, when the oil introduction passage is formed so that the end portion of the oil introduction passage on the closed portion 51 side is located between the root circle and the tip circle of the outer rotor 34, the oil introduction passage is rotated along with the rotation of the outer rotor. A state occurs in which the end portion on the closed portion 51 side is completely closed by the side surface 34c of the outer rotor, and oil is intermittently supplied to the rotor housing portion.

  Therefore, according to the third embodiment, the oil hole 40 and the confining part 51 are intermittently communicated via the oil introduction passage 350, and the oil is intermittently supplied into the rotor accommodating part 41 of the oil circulation pump 331. By supplying the oil, the amount of oil supplied into the oil circulation pump 331 can be suppressed to a small amount, so that a reduction in the suction efficiency of the oil circulation pump 331 can be suppressed while securing lubricating oil quickly and sufficiently. it can.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment, the oil introduction groove 50a that forms the oil introduction passage 50 is formed in a straight line. However, as shown in FIG. 12 corresponding to FIG. 3, the positions of the suction port 47 and the discharge port 42, etc. Accordingly, the oil introduction groove 50a that forms the oil introduction passage 50 can be appropriately formed in a curved shape.

  In the above embodiment, the drive shaft 32 is connected to the camshaft of the valve mechanism 65L so that power can be transmitted, and the oil circulation pump 31 is driven by the rotation of the camshaft. Can be driven by an electric motor or the like.

  Although the horizontal opposed type engine provided with the turbocharger has been described as an example in the above embodiment, the present invention can be applied to a V-type engine equipped with a turbocharger or other types of engines. Can be applied to oil pumps.

1 is a partial cross-sectional front view showing an outline of a horizontally opposed engine equipped with an oil pump showing an outline of a first embodiment of the present invention. Similarly, it is explanatory drawing shown typically. It is explanatory drawing of an oil circulation pump. It is the II sectional view taken on the line of FIG. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is an oil system diagram. It is explanatory drawing of the oil circulation pump which concerns on 2nd Embodiment. It is the IV-IV sectional view taken on the line of FIG. It is explanatory drawing of the oil circulation pump which concerns on 3rd Embodiment. It is the VV sectional view taken on the line of FIG. It is explanatory drawing of an oil circulation pump. It is explanatory drawing of a turbocharger. It is a partial cross section front view showing an outline of a horizontally opposed engine provided with a turbocharger.

Explanation of symbols

10 Engine 13L, 13R Bank 14L, 14R Cylinder head 14a Side 14b Camshaft hole (oil discharge side passage)
17L, 17R Oil collection tank 21 Oil supply pump (oil pressure feeding means)
29 Oil intake passage 31 Oil circulation pump (oil pump)
32 Drive shaft 33 Inner rotor 33a Tooth portion 34 Outer rotor 34a Tooth groove 34b Outer peripheral surface 34c Side surface 34d Inner peripheral surface 35 Pump housing member 36 Pump housing member 37 Base portion 37a End surface 37b Joining surface (first joining surface)
40 Oil hole 40a Orifice 41 Rotor housing part 41a Peripheral surface 41b Bottom surface 42 Discharge port 45 Pump cover member 46 Base part 46b Joining surface (second joining surface)
47 Suction ports 50, 250, 350 Oil introduction passages 50a, 250a, 250b, 350a Oil introduction groove 51 Closed portion 61L, 61R Main gallery 64L, 64R Gallery 65L, 65R Valve mechanism 66L, 66R Gallery 68 Gallery

Claims (11)

An outer rotor having a tooth groove on the inner periphery;
An inner rotor having a tooth portion that meshes with the tooth groove and forms a closed portion with the outer rotor;
A rotor housing portion that rotatably holds and accommodates the outer rotor and the inner rotor, a suction port that introduces oil into the closing portion, and a pump housing portion that has a discharge port that discharges oil sent by the closing portion; In an oil pump with
The pump housing part is
A pump housing member having the rotor accommodating portion opening in the first joint surface;
A pump cover member having a second joint surface that can be joined to the first joint surface and closing the opening of the rotor housing portion;
Oil formed by the oil introduction groove formed on the second joint surface of the pump cover member and the first joint surface of the pump housing member joined to the second joint surface, and the oil pumped by the oil pumping means inside the rotor housing portion. An oil introduction passage to be introduced into ,
An oil pump comprising: An outer rotor having a tooth groove on the inner periphery;
An inner rotor having a tooth portion that meshes with the tooth groove and forms a closed portion with the outer rotor;
A rotor housing portion that rotatably holds and accommodates the outer rotor and the inner rotor, a suction port that introduces oil into the closing portion, and a pump housing portion that has a discharge port that discharges oil sent by the closing portion; In an oil pump with
The pump housing portion includes an oil introduction passage for introducing oil pumped by an oil pumping means into the rotor housing portion,
An oil pump characterized in that oil is intermittently introduced into the confining portion by intermittently communicating the oil introduction passage and the confining portion . 3. The oil pump according to claim 1, wherein the oil introduction passage communicates with the suction port or the discharge port through the rotor accommodating portion. The oil guide passage can be of any claim 1-3, characterized by introducing the oil into the rotor accommodating portion in correspondence with the confinement portion formed by the teeth of the tooth groove and inner rotor of the outer rotor meshing with the mutually The oil pump according to claim 1 . The oil introduction passage, according to any one of claims 1-3, characterized by introducing the oil into the rotor accommodating portion in correspondence between the root circle and the root circle of the inner rotor of the outer rotor Oil pump. The intake port and the discharge port, according to any one of claims 1 to 4, characterized in that the oil guide passage and confinement of the communication state is held in the non-communicated state by the outer rotor and / or the inner rotor Oil pump. The pump housing part is
A pump housing member that houses the rotor portion that opens to the first joint surface;
A pump cover member having a second joint surface that can be joined to the first joint surface and closing the opening of the rotor housing portion;
The oil introduction passage is
An oil introduction groove formed in the first joint surface of the pump housing member or the second joint surface of the pump cover member;
An oil introduction groove formed in the inner rotor;
A second surface of the pump cover member;
The oil pump according to claim 2 , wherein the oil pump is formed by: The pump housing part is
A pump housing member having the rotor accommodating portion opening in the first joint surface;
A pump cover member having a second joint surface that can be joined to the first joint surface and closing the opening of the rotor housing portion;
The oil introduction passage is
An oil introduction groove formed on the second joint surface of the pump cover member and having one end extending between a tooth tip circle of the outer rotor and a tooth bottom circle of the outer rotor, and a pump housing member joined to the second joint surface The oil pump according to claim 2 , wherein the oil pump is formed by the first joint surface. The oil pump according to any one of claims 1 to 8 is disposed on a side surface of a cylinder head including a gallery and a valve mechanism for guiding oil pumped from an oil supply pump that operates when the engine is started. The oil pump lubrication structure, wherein the oil pump is driven by a camshaft of the valve mechanism, and an oil introduction passage communicates with the gallery. The oil pump according to any one of claims 1 to 8 is disposed on a side surface of a cylinder head including a gallery and a valve mechanism for guiding oil pumped from an oil supply pump that operates when the engine is started. An oil pump lubrication structure, wherein the oil introduction passage communicates with the gallery, and an intake port communicates with an oil collecting tank disposed below the oil pump via an oil intake passage. The oil pump lubrication structure according to claim 9 or 10 , wherein the oil introduction passage communicates with the gallery via an orifice.

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