JPH07116929B2 - Engine lubricator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) The present invention includes a feed pump that pumps up oil accumulated in an oil pan and pressure-feeds it to a main gallery, and an oil cooler for cooling the oil. The present invention relates to an engine lubrication device.

(Prior Art and Problems Thereof) Conventionally, as a lubricating device for such an engine, for example, there is a technique disclosed in Japanese Patent Laid-Open No. 59-29715. Generally, a conventional engine lubrication system pumps up oil accumulated in an oil pan with a feed pump, filters the pumped oil with an oil filter, cools it with an oil cooler, and connects it to each part of the engine lubrication system. It is configured to pump to the gallery. That is, the oil cooler is arranged in the oil passage through which the oil is pumped by the feed pump toward the main gallery.

However, in such a conventional technique, the oil pressure-fed to the oil cooler by the feed pump is cooled through a narrow and long passage in the oil cooler, so that the oil pressure loss due to the oil cooler is large and the oil pressure is reduced. Since the load on the feed pump increases by the amount of loss, in order to pump the oil to the main gallery at the required pressure,
The capacity of the feed pump must be increased by the amount of the pressure loss, and when a large-capacity oil cooler having a necessary cooling capacity is used, the feed pump becomes large, which increases the size of the entire engine and reduces the cost. However, there was a problem in that

(Object of the Invention) The present invention has been made in order to solve such a conventional problem, and even when a large-capacity oil cooler having a required cooling capacity is used, the feed pump does not increase in size, It is an object of the present invention to provide an engine lubrication device which can reduce the size of the entire engine, reduce the number of parts, and reduce the cost.

(Structure of the Invention) In order to achieve the above object, an engine lubrication device of the present invention comprises a trochoid pump that is directly connected to a crankshaft of an engine and pumps up oil accumulated in an oil pan to form an engine lubrication system. A feed pump that pressure-feeds to a main gallery that communicates with each part, an oil cooler that cools oil, and an oil-cooler pump that communicates with the engine lubrication system and pumps up oil in the oil pan and pressure-feeds it to the oil cooler. In the engine lubrication device, the oil cooler pump is composed of a gear pump having a drive gear and a driven gear, and one of the drive gear and the driven gear is drivably connected to a balancer shaft of a balancer device of the engine. And the drive gear is driven by the crankshaft. It is characterized by being done.

(Operation) According to the engine lubrication apparatus of the present invention having the above configuration, the feed pump configured by the trochoid pump is driven by the crankshaft of the engine, and the oil accumulated in the oil pan is pumped up to the engine lubrication system. Are sent to the main gallery that communicates with each part of. On the other hand, a pump for an oil cooler, which is composed of a gear pump that is in communication with an engine lubrication system and has a drive gear and a driven gear,
One of the drive gear and the driven gear drives the balancer shaft of the balancer device of the engine, the drive gear is driven by the crankshaft, the oil in the oil pan is pumped up and pumped to the oil cooler, and the oil cooler The cooled oil is returned to the oil pan or directly pumped to the main gallery.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing an engine lubrication apparatus according to an embodiment in which the present invention is applied to an in-line 4-cylinder engine.

As shown in FIG. 1, an engine lubrication device 1 includes an oil pan 3 attached to a lower portion of a cylinder block 2,
A feed pump 5 that pumps up the oil accumulated in the oil pan 3 and pressure-feeds it to a main gallery 4 that communicates with various parts of the engine lubrication system, an oil cooler 6 for cooling the oil, and an oil in the oil pan 3 It is provided with an oil cooler pump 7 for pumping up and sending it to the oil cooler 6 under pressure, and an oil return oil passage 8 for returning the oil cooled by the oil cooler 6 into the oil pan 3.

An oil strainer 9 is arranged in the oil pan 3, and the outlet 9 a of the oil strainer 9 and the feed pump 5 are arranged.
The suction port 5a is connected by an oil passage 10. The discharge port 5b of the feed pump 5 is connected to the main gallery 4 by an oil passage 11, and an oil filter 12 for filtering oil is provided in the oil passage 11. A relief valve 14 that opens at a predetermined pressure is provided in the oil return oil passage 13 that is branched from the oil passage 11, and oil having a predetermined hydraulic pressure or more is returned to the oil return oil passage.
It is configured to be returned to the oil pan 3 via the 13 and the relief valve 14.

The oil passage 15 branched from the oil passage 10 is connected to the suction port 7a of the oil cooler pump 7. The discharge port 7b of the oil cooler pump 7 is connected to the inlet 6a of the oil cooler 6 by the oil passage 16.
And the oil return oil passage 47. A relief valve 18 that opens at a predetermined pressure is provided in the oil return oil passage 17, and oil above a predetermined hydraulic pressure is passed through the oil return oil passage 17 and the relief valve 18 to the oil pan 3
Made to be returned to. Outlet 6b of oil cooler 6
The oil return oil passage 8 is connected to.

The main gallery 4 is connected to each cylinder via oil passages 19 _{1 to} 19 _4.
20 _{1 to} 20 ₄ crankshafts 21 _{1 to} 21 ₄ communicate with respective bearings and also communicate with a lubrication portion (not shown) of a valve operating system in the cylinder head 23 via an oil passage 22. There is. Crankshaft
Each of the bearings of 21 _{1 to} 21 ₄ is an oil passage 25 _{1 to} 25 ₄ which passes through each of the bearings of the crank pins 24 _{1 to} 24 ₄ and a crank arm (not shown).
Through the. The crank pin 24 _{1-24 4} connecting rod large end portion 26 _{1-26 4} fitted respectively to the crank pin 24
Oil holes 26 ₁ ′ to 26 ₄ ′ are formed to blow oil from the bearings _{1 to} 24 ₄ toward the inside of the pistons 27 _{1 to} 27 ₄ , respectively.

As shown in FIG. 2, the engine main body 28 including the cylinder block 2 and the cylinder head 23 has a two-shaft type
The next balancer device 30 is mounted. The secondary balancer device 30 includes a pair of left balancer shafts 31 and right balancer shafts 32 (a balancer 32a of the right balancer shaft 32 is shown in FIG. 4) which are arranged on both sides of the crankshaft 21 and are each provided with a balancer. However, the balancer of the left balancer shaft 31 is not shown), and the reciprocating body such as the pistons 27 _{1 to} 27 ₄ is provided by rotating the pair of balancer shafts 31 and 32 in opposite directions by the crankshaft 21. It balances the primary inertial force of the above and the inertial force of the secondary component or more.

The secondary balancer device 30 includes a pulley 33 mounted on the crank shaft 21, a left balancer shaft 31 arranged in parallel with the crank shaft 21, a left pulley 34 mounted on the left balancer shaft 31, and the oil. The right pulley 35 mounted on the drive gear shaft 71a (see FIG. 4) of the drive gear 71 of the cooler pump 7 and the driven gear shaft of the driven gear 72 of the oil cooler pump 7 are arranged in parallel with the crankshaft 21. The right balancer shaft 32, the tensioner 36, and teeth on both sides and each pulley
Drive belt wrapped around 33,34,35 and tensioner 36
Composed of 37 and.

As shown in FIGS. 3 and 4, the oil cooler pump 7 is a gear pump including a drive gear 71 and a driven gear 72 meshing with the drive gear 71. The drive gear 71 and the driven gear 72 are housed in a pump case 73, and the pump case 73 is fixed to the engine body 28 by bolts 73a. A lid 74 is attached to an end surface of the pump case 73 on the engine body 28 side. The tip portion 32b of the right balancer shaft 32 penetrates through the through hole 74a of the lid 74 and is press-fitted into the hole 72a of the driven gear 72 to integrally rotate the right balancer shaft 32 and the driven gear 72. There is. In this way, the right balancer shaft 32 is arranged as the driven gear shaft of the driven gear 72, and the pump 7 for the oil cooler is arranged.
Is driven by using the right balancer shaft 32 of the secondary balancer device 30.

Drive gear shaft 71 of the oil cooler pump 7
The a penetrates the boss hole 73b of the pump case 73 and projects to the outside of the pump case 73, and a seal member 75 seals between the boss hole 73b and the drive gear shaft 71a. The right pulley 3 is attached to the tip of the drive gear shaft 71a.
5 is fastened by a tightening nut 76. The tightening nut 7
6, the right pulley 35 and the drive belt 37, the pump case 73
It is covered with a cover (not shown) attached to the.

In addition, the pump case 73 of the oil cooler pump 7 has an intake port 7a through which the oil passing through the strainer 9 arranged in the oil pan 3 is introduced through the oil passage (pipe) 15, and the oil A discharge port 7b communicating with the passage 16 is formed. In the pump case 73, an inflow path 7c communicating with the suction port 7a and an outflow path 7d communicating with the discharge port 7b are formed.

As shown in FIGS. 3 and 5, the feed pump 5
Is the inner rotor 51 that can rotate integrally with the crankshaft 21.
And a trochoid pump directly connected to the crankshaft, which is composed of an outer rotor 52 capable of meshing with the inner rotor 51. The pump case of the feed pump 5 comprises a case 53 and a lid 54, and a boss hole 53 a of the case 53 and the crankshaft 21 are sealed by a seal member 55.

Next, the operation of the engine lubrication device having the above configuration will be described.

When the engine is driven and the crankshaft 21 rotates counterclockwise as shown by the solid arrow in FIG. 2, the feed pump 5
The inner rotor 51 of FIG. 3 rotates counterclockwise integrally with the crankshaft 21 in FIG. 3 to drive the feed pump 5.

The rotation of the crankshaft 21 is driven by the drive belt 37 and the left pulley 34
And the right pulley 35 and both pulleys 34 and 35 rotate clockwise in FIG.
Is transmitted to the drive gear 71 via the drive gear shaft 71a, and the drive gear 71 rotates clockwise in FIGS. 2 and 3, whereby the oil cooler pump 7 is driven.

By rotating the left pulley 34 in the clockwise direction in FIG. 2, the left balancer shaft 31 also rotates in the clockwise direction in FIG. 2, while the drive gear 71 rotates in the clockwise direction in FIG. The driven gear 72 and the right balancer shaft 32 rotate counterclockwise in the figure, which causes the secondary balancer device 30 to rotate.
Is driven. In this way, the left balancer shaft 31 and the right balancer shaft are linked with the rotation of the crankshaft 21.
The secondary balancer device 30 is driven so as to rotate in opposite directions with respect to 32, thereby balancing the primary inertial force of the reciprocating body such as the pistons 27 _{1 to} 27 ₄ and the inertial force of the secondary component or more.

As described above, when the inner rotor 51 and the outer rotor 52 both rotate counterclockwise in FIG. 3 and the feed pump 5 is driven, the feed pump 5 causes the oil accumulated in the oil pan 3 to move to the strainer 9, It is pumped up from the suction port 5a through the oil passage (pipe) 10 and is pressure-fed to the oil passage 11 from the discharge port 5b. A part of the oil pumped into the oil passage 11 is filtered by the oil filter 12 and pumped into the main gallery 4, and further lubricated in the cylinders 20 _{1 to} 20 ₄ via the oil passages 19 _{1 to} 19 _4. Sent to the department. The oil pressure-fed to each of the cylinders 20 _{1 to} 20 ₄ first lubricates the bearings of the crankshafts 21 _{1 to} 21 ₄ , and the oil passages 25 ₁ to 25 ₁ from each bearing pass through the crank arms (not shown). 25 crankpin 24 21 _to through ₄
Lubricate each bearing of 4 ₄ and further connect the large end of connecting rod 26 ₁
~ 26 ₄ oil holes 26 ₁ ′ ~ 26 ₄ ′ blow out from piston 27 ₁ ~
Cool the inside of 27 ₄ . Further, a part of the oil pressure-fed to the main gallery 4 rises into the cylinder head 23 via the oil passage 22 and lubricates the lubrication portion of the valve train in the cylinder head 23. The oil that has lubricated the lubricated parts of the engine in this way is returned to the oil pan 3. When the oil pressure-fed to the oil passage 11 from the discharge port 5b of the feed pump 5 has a predetermined hydraulic pressure or higher, the oil is returned to the oil pan 3 through the oil passage 13 and the relief valve 14.

On the other hand, as described above, when the drive gear 71 rotates clockwise in FIG. 3 to drive the oil cooler pump, the oil cooler pump 7 causes the oil accumulated in the oil pan 3 to be strained by the strainer 9 , Is pumped through the oil passage (pipe) 15 from the suction port 7a into the inflow passage 7c, the pumped oil is pumped into the outflow passage 7d by the rotation of the drive gear 71 and the driven gear 72, and further discharged from the discharge port 7b. It is pumped to the oil passage 16 and then to the oil cooler 6. The oil sent to the oil cooler 6 is cooled while passing through a narrow passage in the oil cooler 6, and the cooled oil is returned to the oil pan 3 through the oil return oil passage 8. An oil passage 8'for guiding the oil discharged from the oil cooler 6 to the oil passage 11 in front of the oil filter 12 may be provided on the line indicated by the imaginary line in FIG. When the oil pressure-fed from the discharge port 7b to the oil passage 16 has a predetermined hydraulic pressure or more,
This oil is returned to the oil pan 3 through the oil passage 17 and the relief valve 18. In this way, the oil pressure feed from the oil pan 3 to the oil cooler 6 is performed by the feed pump 5
It is performed by an oil cooler pump 7 provided separately from the above.

According to the above-described embodiment, by disposing the right balancer shaft 32 of the secondary balancer device 30 as the driven gear shaft of the driven gear 72 of the oil cooler pump 7, the oil cooler pump 7 is disposed on the right side of the secondary balancer device 30. Since the balancer shaft 32 is used for driving, the driven gear shaft of the driven gear 72 is not required, and a special drive device for the oil cooler pump 7 is not required, thus simplifying the entire structure. The number of parts can be reduced and the cost can be reduced.

Further, according to the above-mentioned embodiment, since the feed pump 5 is constituted by the trochoid pump directly connected to the crankshaft,
A drive device for the feed pump 5 is not required, and the entire structure can be simplified and the number of parts can be reduced as in the above case, which has an advantage that the cost can be reduced.

In the above embodiment, the two-shaft type secondary balancer device is used. However, the present invention is not limited to this, and a pair of balancer shafts are mounted on the crankshaft 21 so as to be opposite to the crankshaft 21. A two-axis type primary balancer device that rotates to balance the primary inertial force of a reciprocating body such as a piston is used, and the right balancer shaft of the primary balancer device drives the drive gear 71 of the oil cooler pump 7. It may be arranged coaxially with the gear shaft 71a. Further, the present invention may be applied to a uniaxial primary balancer device.

Further, in the above embodiment, when a dry sump type engine lubrication system including the oil cooler pump 7 and the scavenging pump is used, the biaxial secondary balancer device 30 uses the left balancer shaft 31 for the scavenging. It may be arranged coaxially with the drive gear shaft of the engine pump, and the right balancer shaft 32 thereof may be arranged as the driven gear shaft of the driven gear 72 of the oil cooler pump 7. According to this structure, the structure of the dry sump type engine lubrication system can be simplified and the number of parts can be reduced, whereby the cost can be reduced.

(Effects of the Invention) As described above, according to the engine lubrication system of the present invention, the engine lubrication system is constructed by pumping up the oil accumulated in the oil pan, which is composed of the trochoid pump directly connected to the crankshaft of the engine. , A feed pump for pressure-feeding to a main gallery communicating with each part of the engine, an oil cooler for cooling oil, and an oil-cooler pump for communicating with the engine lubrication system to pump up oil in the oil pan and pressure-feed to the oil cooler. In the engine lubrication device including the above, the oil cooler pump is composed of a gear pump having a drive gear and a driven gear, and one of the drive gear and the driven gear can be driven with the balancer shaft of the balancer device of the engine. Connected, and the drive gear is driven by the crankshaft. Since it is configured to operate, the feed pump does not have to bear the oil pressure loss due to the oil cooler, and the feed pump must be large even when a large capacity oil cooler with the required cooling capacity is used. In addition, the drive of the balancer shaft by the crankshaft can double as the drive of the oil cooler pump, and a special device for driving the oil cooler pump can be omitted, resulting in a simplified overall structure. In addition to being able to reduce the number of parts, the cost can be reduced.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, and FIG. 1 is a schematic diagram showing an engine lubrication device according to an embodiment in which the present invention is applied to an in-line 4-cylinder engine. The figure shows 2
FIG. 3 is a plan view showing a schematic arrangement of an axial type secondary balancer device, FIG. 3 is a vertical sectional view of FIG. 2, FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, and FIG. It is sectional drawing which follows the VV line of FIG. 1 …… Engine lubricator, 3 …… Oil pan, 4 ……
Main gallery, 5 ... Feed pump, 6 ... Oil cooler, 7 ... Oil cooler pump.

Claims (1)

[Claims] 1. A feed pump configured by a trochoid pump that is directly connected to a crankshaft of an engine to pump up oil accumulated in an oil pan and send it under pressure to a main gallery communicating with various parts of an engine lubrication system, and cooling the oil. In an engine lubrication device including an oil cooler for and an oil cooler pump that communicates with the engine lubrication system and pumps up the oil in the oil pan and pressure-feeds the oil cooler, the oil cooler pump is A gear pump having a drive gear and a driven gear, wherein one of the drive gear and the driven gear is drivably connected to a balancer shaft of a balancer device of the engine, and the drive gear is driven by the crankshaft. And engine lubricator.