JP2003206715A - Oil feeder for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten the overall length of an engine, reduce the weight thereof and use a dead space effectively. <P>SOLUTION: A case side bearing member of a lower case facing one side of the engine across a crankshaft axis direction has an inlet passage for interconnecting an oil pan and a suction passage in a pump housing portion. The inlet passage has a strainer mounting portion at an oil pan side end. A strainer is mounted on the strainer mounting portion. Via the oil strainer, the inlet passage defined in the case side bearing member adjacent to a rotor plate introduces oil in the oil pan into the suction passage defined between a chain case and the rotor plate. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil supply device for an engine, and more particularly, it can improve the sealing performance of an opening portion of a main oil passage and reduce a sealing failure, and can provide a degree of freedom of installation position of the oil supply passage. The present invention relates to an oil supply device for an engine, which can improve the seal area of the sub-oil passage by increasing the oil pressure, ensuring the passage area of the oil supply passage.

[0002]

2. Description of the Related Art An engine is provided with an oil supply device in order to lubricate sliding parts and cool high temperature parts. The oil supply device is provided with an oil pump driven by the crankshaft of the engine. The oil pump sucks the oil in the oil pan and supplies it to the main oil passage of the cylinder block. The oil in the main oil passage is supplied to the bearing portion of the crankshaft, the inner peripheral surface of the cylinder, and the like to perform lubrication and cooling.

Conventional oil supply devices for engines include those shown in FIGS. 16 to 20. In FIGS. 16 to 18, 202 is an engine, 204 is a cylinder block, 2
Reference numeral 06 is a crankshaft, and 208 is a lower case. The engine 202 includes a cylinder block 204 and a crankshaft 20.
A lower case 208 for supporting 6 is attached, and an oil pan (not shown) is attached to the lower case 208. A chain case 212 that covers a timing chain (not shown) is attached to one side surface 210 of the cylinder block 204 and the lower case 208 in the direction of the crankshaft axis A.

The oil supply device 21 of the engine 202
4 is a chain case 21 as shown in FIGS.
An oil pump 216, which is driven by the crankshaft 206, is attached to the inside of 2. This oil pump 216
The inner rotor and the outer rotor (not shown) are rotatably incorporated in the pump housing portion 220 provided on the wall portion 218 of the chain case 212, and the rotor plate 222 is attached so as to cover them.

The oil pump 216 sucks and discharges the oil in the oil pan. The discharged oil is supplied to the main oil passage 226 through an oil filter (not shown) by the sub oil passage 224 of the cylinder block 204.
Is supplied to. The main oil passage 226 has one end opened to the opening 228 of the one side 210 of the cylinder block 204 in the direction of the crankshaft axis A and the other end directed to the other side (not shown) of the direction of the crankshaft axis A. Is provided.

The oil in the main oil passage 226 is
The oil is supplied to the block side bearing surface 232 of the block side bearing member 230 of the cylinder block 204 by the oil supply passage 234, and is also supplied to the bearing surface of the crankshaft and the camshaft by an oil supply passage (not shown) to perform lubrication and cooling. .

An oil supply device for such an engine is disclosed in Japanese Unexamined Patent Publication No. 61-185609, Japanese Utility Model Publication No. 3-5.
There are those disclosed in Japanese Patent No. 1156 and Japanese Utility Model Laid-Open No. 1-102412.

In the oil supply device disclosed in Japanese Patent Laid-Open No. 61-185609, a crankshaft is axially supported by bearing caps fixed to a plurality of journal walls of a cylinder block, and the bearing caps are bridge members. In the engine connected by, the baffle plate is fixed to the lower surface of the bridge member so as to block between the crankshaft and the oil sump.

In the oil supply device disclosed in Japanese Utility Model Laid-Open No. 3-51156, an oil-proof and reinforcing plate is fixed to the lower end of a lower half frame that constitutes the lower half of the crankcase of the engine, and the lower half is said. An oil return gap is formed between the left and right side walls of the frame and both side edges of the oil-proof and reinforcing plate, and a boss portion for attaching the suction pipe of the oil strainer is formed in the oil return gap.

The oil supply device disclosed in Japanese Utility Model Laid-Open Publication No. 1-102412 discloses an oil passage and a suction passage which are supplied from a discharge side chamber of an oil pump at a mating surface of a crankcase side bearing for supporting a crankshaft and a bearing cap. A relief valve is provided in communication with an oil return passage that is returned to the side chamber, a relief valve is provided through the mating surface, and an oil strainer is integrally provided in the main shaft cap through a suction pipe.

[0011]

By the way, as shown in FIG.
The oil supply device 214 shown in FIG. 20 has one end opened to the opening 228 of the one side 210 of the crankshaft axis A direction of the cylinder block 204 and the other end directed to the other side of the crankshaft axis A direction. Oil pump 2
Main oil passage 2 supplied with oil discharged from 16
26 is provided. The opening 228 of the main oil passage 226 is closed by screwing a PT plug 236 as shown in FIG.

However, in the main oil passage 228,
An inlet hole 238 of an oil supply passage 234 that communicates with a block side bearing surface 232 of a block side bearing member 230 that pivotally supports the crankshaft 206 of the cylinder block 204 is provided.

Therefore, the inlet hole 2 of the oil supply passage 234 provided in the block side bearing member 230 on the one side 210 side of the cylinder block 204 in the direction of the crankshaft axis A.
38 has a problem that a part thereof is blocked by the PT plug 236 screwed into the opening 228 of the main oil passage 226.

The opening 2 of the main oil passage 226
The PT plug 236 that is screwed to the screw 28 enters the main oil passage 226 more than the setting depending on the tightening torque control, and thus the inlet hole 238 of the oil supply passage 234.
The opening 2 due to complete blockage or excessive tightening.
The area around 28 may be deformed and cracked, which may lead to a defect of the main oil passage 226 and deterioration of the sealing performance.

Further, the deformation of the main oil passage 226 around the opening 228 due to the screwing of the PT plug 236 causes the sub oil passage 224 adjacent to the main oil passage 226.
There is a disadvantage that the sealability between the rotor plate 222 and the rotor plate 222 is deteriorated.

In the oil pump 216 of the oil supply device 214, an inner rotor and an outer rotor (not shown) are rotatably housed in a pump housing portion 220 provided in the chain case 212, and a rotor plate 222 covers them. Is installed.

The rotor plate 222 is shown in FIGS.
As shown in FIG. 9, the introduction passage forming portion 240 is formed and provided, and the strainer mounting flange 242 is formed on the introduction passage forming portion 240, and the inside of the oil pan and the suction passage 244 of the oil pump 216 are formed in the introduction passage forming portion 240. An introduction passage 246 that communicates with and is formed and provided, and an oil strainer (not shown) is attached to the strainer attachment flange 242.

However, since the introduction passage forming portion 240 and the strainer mounting flange 242 are provided so as to project inside the rotor plate 222, the block side of the cylinder block 204 on the one side 210 side in the direction of the crankshaft axis A. There is a problem that the chain case 212 must be formed so as not to interfere with the bearing member 230.

Therefore, the chain case 212 has one side surface 2 in the direction of the crankshaft axis A of the cylinder block 204.
The length L is projected from 10 and the engine 2
02 has the disadvantage of increasing the total length and increasing the weight.

Further, as shown in FIGS. 18 and 19, the oil pump 216 of the oil supply device 214 is provided with the rotor plate 222 attached to the chain case 212 and the relief passage forming portion 248 formed on the rotor plate 222. The valve mounting portion 250 is formed and provided,
The relief passage 2 that connects the discharge passage 252 of the oil pump 216 and the inside of the oil pan to the relief passage forming portion 248.
54 is formed and the relief valve 258 is mounted in the relief valve mounting hole 256 of the relief valve mounting portion 250.

However, since the relief passage forming portion 248 and the relief valve mounting portion 250 are provided so as to protrude inside the rotor plate 222, the cylinder block 204 is locked on the side surface 210 side in the direction of the crankshaft axis A. There is a problem that the chain case 212 must be formed so as not to interfere with the side bearing member 230.

Therefore, the chain case 212 has one side surface 2 in the direction of the crankshaft axis A of the cylinder block 204.
The length L is projected from 10 and the engine 2
02 has the disadvantage of increasing the total length and increasing the weight.

[0023]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention is provided with a lower case for pivotally supporting a crankshaft attached to a cylinder block of an engine, and an oil pan is attached to the lower case. A chain case that covers the timing chain is attached to one side of the engine in the direction of the crankshaft axis, and an oil pump that is driven by the crankshaft and sucks the oil in the oil pan is attached to the inside of the chain case. A pump housing part of the oil pump is provided in the chain case, and an inner rotor and an outer rotor which is externally mounted on the inner rotor and rotates together are rotatably incorporated in the pump housing part, and the rotor plate covers the inner rotor and the outer rotor. Is installed and installed, and the cylinder block The main oil passage is provided with an opening on one side in the axial direction of the crankshaft and one end of which is directed to the other side in the axial direction of the crankshaft and the main oil passage to which the oil discharged from the oil pump is supplied. The block side bearing member adjacent to the rotor plate is provided with an oil supply passage communicating with the inlet hole near the opening of the passage, and the rotor plate is provided with a main oil passage of the main oil passage so as not to block the inlet hole of the oil supply passage. It is characterized by closing the opening.

A case-side bearing member of the lower case on the one side in the axial direction of the crankshaft is provided with an introduction passage that connects the oil pan with the suction passage in the pump housing, and a strainer is provided at the end of the introduction passage on the oil pan side. A mounting portion is provided, and a strainer is provided by mounting the strainer on the strainer mounting portion. The oil of the oil pan is introduced through the oil strainer from the introduction passage provided in the case side bearing member adjacent to the rotor plate to the chain case and the rotor plate. It is introduced into an intake passage provided between the case and the case side bearing member of the lower case on the one side surface side in the axial direction of the crankshaft so that the discharge passage of the oil pump communicates with the inside of the oil pan. A relief passage is provided, a relief valve mounting hole is provided in the middle of the relief passage, and the relief valve mounting hole is provided with a relief valve. The oil discharged to the discharge passage of the oil pump provided between the rotor plate and the chain case is attached to the relief passage provided in the case side bearing member adjacent to the rotor plate. It is characterized by being adjusted to a set pressure by a valve and returned to the oil pan.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION In the engine oil supply device of the present invention, a cylinder block, a lower case, and an oil pan are sequentially stacked and mounted, and a chain cover is mounted on one side surface in the axial direction of the crankshaft. An oil supply passage for lubricating the journal on one side of the crankshaft in the crankshaft axial direction is installed in the block side bearing member of the cylinder block on the one side in the crankshaft axial direction, and the oil supply passage for communicating with the main oil passage is provided. By closing the main oil passage with the rotor plate of the oil pump provided inside the chain case so as not to block the inlet hole, the oil supply passage provided in the block side bearing member of the cylinder block like the conventional PT plug Does not block the inlet hole of the Without deforming around part, it can close the opening of the main oil passage.

In the engine oil supply device of the present invention, the case side bearing member on one side of the lower case in the direction of the crankshaft axis extends from the strainer mounting portion of the oil strainer and the oil strainer to the suction passage of the oil pump inside the chain case. By providing an introduction passage that is an oil passage of, by taking the oil in the oil pan directly from the oil strainer into the suction chamber of the oil pump through the introduction passage of the case side bearing member on the one side in the crankshaft axis direction, By using the case side bearing member of the lower case, it is possible to provide an introduction passage for introducing the oil in the oil pan into the oil pump and a strainer mounting portion for mounting the oil strainer. This strainer mounting flange is not formed by protruding It is possible to shorten the length rate is projected to the crankshaft axial direction of the chain case mounted.

Further, in the engine oil supply device of the present invention, the case side bearing member on the one side in the crankshaft axis direction of the lower case is provided with a relief passage that connects the discharge passage of the oil pump and the oil pan, and the relief passage of this relief passage. By installing a relief valve on the way and returning excess oil from the discharge passage of the oil pump inside the chain case directly to the oil pan via the relief valve of the case side bearing member on the one side in the crankshaft axis direction, the case of the lower case By using the side bearing member, a relief passage for relieving the oil discharged from the oil pump and a relief valve mounting hole for mounting the relief valve can be provided. As in the conventional case, the relief passage forming portion and the relief valve mounting portion can be formed in the rotor plate. Chain to which this rotor plate is attached It is possible to shorten the protruded by a length of the crankshaft axial direction over the scan.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a first embodiment of the present invention. In FIG. 6, 2 is an engine, 4 is a cylinder block, 6 is a crankshaft, 8 is a lower case, and 10 is an oil pan. In the engine 2, a lower case 8 is attached to a cylinder block 4, a crankshaft 6 is pivotally supported, and an oil pan 10 is attached to the lower case 8. Further, the engine 2 has a cylinder head (not shown) attached to the cylinder block 4, and a cam shaft (not shown) is pivotally supported.

The cylinder block 4 has the structure shown in FIGS.
, A plurality of block-side bearing members 12 are provided in parallel to the direction intersecting the crankshaft axis A, and each side end of the plurality of block-side bearing members 12 in the direction intersecting the crankshaft axis A is blocked. It is connected to 14. Each block side bearing member 12 is provided with a block side bearing surface 16.

A plurality of case-side bearing members 18 which cooperate with the block-side bearing member 12 to pivotally support the crankshaft 6 are provided in the lower case 8 in parallel with each other in a direction intersecting with the crankshaft axis A. Each side end of the case side bearing member 18 in the direction intersecting with the crankshaft axis A is connected by a case connecting member 20. Each case side bearing member 18 is provided with a case side bearing surface 22.

The crankshaft 6 is connected to the cylinder block 4
Block side bearing surface 16 of the block side bearing member portion 12
And the case-side bearing surface 22 of the case-side bearing member 18 of the lower case 8.

The engine 2 has one side surface 24 in the direction of the crankshaft axis A of the cylinder block 4 and the lower case 8.
As shown in FIGS. 3 and 4, a chain case 26 is attached to cover a timing chain (not shown) that connects the crankshaft 6 and a cam shaft (not shown). The chain case 26 has an insertion hole 30 through which the crankshaft 6 is inserted in a wall portion 28 that covers one side surface 24 of the cylinder block 4 and the lower case 8 in the direction of the crankshaft axis A.

The engine 2 includes an oil supply device 32.
Is provided. The oil supply device 32 includes an oil pump 34 that is driven by the crankshaft 6 inside the wall portion 28 of the chain case 26.

The oil pump 34 is the chain case 26.
A pump housing portion 36 is provided by protruding the periphery of the insertion hole 30 of the wall portion 28 of the pump housing portion 36, and a rotor housing recess 38 is provided in the pump housing portion 36. An inner rotor 40 that is rotated by the crankshaft 6 and an outer rotor 42 that is externally mounted on the inner rotor 40 and rotates together are rotatably incorporated in the rotor housing recess 38, and the rotor plate 44 covers the inner rotor 40 and the outer rotor 42. Are attached by plate mounting bolts 46. The rotor plate 44 is provided with a crankshaft hole 48 through which the crankshaft 6 is inserted.

The oil pump 34 is provided with a suction passage 52 and a discharge passage 54, which communicate with the pump chamber 50 between the teeth of the inner rotor 40 and the outer rotor 42, between the pump housing portion 36 of the chain case 26 and the rotor plate 44. . The suction passage 52 communicates with the inside of the oil pan 10 via the oil strainer 58 by the introduction passage 56. The discharge passage 54 communicates with the inside of the oil pan 10 via a relief valve 62 by a relief passage 60.

The oil pump 34 introduces the oil in the oil pan 10 into the suction passage 52 through the oil strainer 58 through the introduction passage 56, sucks the oil in the suction passage 52 into the pump chamber 50 and compresses it, and the discharge passage. Discharge to 54. The oil discharged into the discharge passage 54 receives the relief valve 6
The set pressure is adjusted by 2. The surplus oil is returned to the oil pan 10 by the relief passage 60.

A discharge passage 5 is provided in the cylinder block 4.
4 is provided with a sub oil passage 64. The sub oil passage 64 has one end opened to the opening 68 of the sub opening boss 66 provided on the one side surface 24 of the cylinder block 4 in the direction of the crankshaft axis A, and the other end of the sub oil passage 64 in the direction A of the crankshaft axis. It is provided so as to be directed to the other side surface (not shown). The sub oil passage 64 has an inlet passage 7 of the filter mounting portion 70 provided on the block wall portion 14 on the other end side.
It communicates with 2. The inlet passage 72 is provided in the filter mounting portion 7
It is communicated with the oil filter 74 attached to No. 0.

A main oil passage 76 is provided in the cylinder block 4 adjacent to the sub oil passage 64. The main oil passage 76 has one end opened to an opening 80 of a main opening boss 78 provided on one side surface 24 of the cylinder block 4 in the direction of the crankshaft axis A, and the other end of the main oil passage 76 to the direction of the crankshaft axis A. It is provided so as to point to the other side surface. The main oil passage 76 is in communication with the outlet passage 82 of the oil filter 74 in the middle thereof.

The block-side bearing member 12 of the cylinder block 4 is provided with an oil supply passage 84, respectively.
The oil supply passage 84 has a main oil passage 76 on one end side.
The opening is provided in the inlet hole 86 provided in the, and the other end is provided in the outlet hole 88 provided in the block side bearing surface 16.

As shown in FIG. 5, the rotor plate 44 of the oil pump 34 attached to the chain case 26 is provided with main sealing means 90 for sealing the opening 80 of the main oil passage 76.

The sealing means 90 is provided with a main seal boss portion 92 which is brought into contact with the main opening boss portion 78 of the cylinder block 4 on the rotor plate 44. The main seal boss portion 92 is matched with the opening portion 80 and A main seal fitting hole 94 having a diameter slightly larger than the opening 80.
The main seal step portion 96 is provided around the seal fitting hole 94, the main fitting tube 98 is press-fitted into the seal fitting hole 94, and the seal step portion 96 around the fitting tube 98 is provided. The main O-ring 100 is attached to the.

The fitting cylinder 98 is the chain case 26.
When the rotor plate 44 attached to the cylinder block 4 is attached to the cylinder block 4, the O-ring 100 is surely held by the seal step portion 96, and has a diameter slightly larger than that of the opening portion 80 formed in the opening boss portion 78. It is pressed into the block fitting hole 102. The O-ring 100 is pressed against the opening boss 78 around the block fitting hole 102 to seal the opening 80.

The opening boss portion 6 of the sub oil passage 64 is provided.
6 is sealed by the sub sealing means 104.
Similar to the main opening 80, the sub sealing means 104 has a sub opening boss 66 on the rotor plate 44.
A sub seal boss portion 106 that comes into contact with is provided, and a sub seal fitting hole 108 communicating with the discharge passage 54 is provided in the seal boss portion 106, and a sub seal step portion is provided around the seal fitting hole 108. 110 is provided, the sub fitting cylinder 112 is press-fitted into the seal fitting hole 108, and the sub O-ring 114 is attached to the seal step portion 110. The fitting cylinder 112 is press-fitted into the sub block fitting hole 116 provided in the opening 68. O-ring 11
4 seals the opening 68.

Next, the operation of the first embodiment will be described.

When the oil pump 34 is driven by the crankshaft 6 of the engine 2, the oil supply device 32 introduces the oil in the oil pan 10 through the oil strainer 58 into the intake passage 52 through the introduction passage 56 to suck the oil. Passage 5
The second oil is sucked into the pump chamber 50, compressed, and discharged into the discharge passage 54.

The oil discharged into the discharge passage 54 is adjusted to a set pressure by the relief valve 62. The surplus oil is returned to the oil pan 10 by the relief passage 60. The oil adjusted to the set pressure by the relief valve 62 is supplied to the main oil passage 76 via the oil filter 74 by the sub oil passage 64, and the block side bearing surface 16 and the cam shaft (not shown) by the oil supply passage 84.
Is supplied to the bearing surface of the crankshaft 6 and the like to lubricate and cool the crankshaft 6 and the camshaft (not shown).

In this oil supply device 32, a sealing means 90 is provided on a rotor plate 44 of an oil pump 34 attached to the chain case 26.

The chain case 26 is attached to the cylinder block 4
At the time of installation, the fitting cylinder 98 is press-fitted into the seal fitting hole 94 of the sealing means 90 provided on the rotor plate 44, and the O-ring 100 is mounted on the seal step portion 96.

In the chain case 26, the fitting cylinder 98 is pressed into the block fitting hole 102 of the opening boss portion 78, and the O-ring 100 is pressed into contact with the opening boss portion 78 around the block fitting hole 102. It is attached to the cylinder block 4 by a mounting bolt (not shown).

As a result, the opening 80 of the main oil passage 76 is sealed by the O-ring 100. It should be noted that the opening 68 of the sub oil passage 64, when the chain case 26 is attached, is similar to the opening 80 of the main oil passage 76 in the fitting cylinder 112 and the block fitting hole 116.
And press the O-ring 114 into the opening boss 68.
It is sealed by being pressed against.

As described above, the oil supply device 32 of the engine 2 has the rotor plate 44 of the oil pump 34 attached to the chain case 26 and the main oil passage 7 in the rotor plate 44.
By providing the sealing means 90 for sealing the opening 80 of the No. 6 with the O-ring 100, the block side bearing member 12 of the cylinder block 4 like the conventional PT plug.
Does not close the inlet hole 86 of the oil supply passage 84 provided in the main oil passage 76, and does not deform around the opening 80 of the main oil passage 76 unlike the conventional PT plug.
The opening 80 of the main oil passage 76 can be closed.

Therefore, the oil supply device 32 can improve the sealing performance of the opening 80 of the main oil passage 76 and reduce the sealing failure, and the oil provided on the block side bearing member 12 of the cylinder block 4 can be reduced. Supply passage 8
It is possible to increase the degree of freedom of the installation position of No. 4 and secure the passage area of the oil supply passage 84, and the contact surface of the opening boss portion 66 provided with the opening portion 68 of the sub oil passage 64 adjacent to the main oil passage 76. The reliability of the flatness can be improved, and the sealing property of the O-ring 114 that seals the opening 68 of the sub oil passage 64 can be improved.

The sealing means 90 is the O-ring 10
Not only 0 but also a gasket or a liquid gasket can be used.

7 to 12 show a second embodiment of the present invention. In the second embodiment, the parts having the same functions as those in the first embodiment will be described with the same reference numerals.

7 to 12, 2 is an engine, 4 is
Is a cylinder block, 6 is a crankshaft, 8 is a lower case, 10 is an oil pan, 12 is a block side bearing member portion,
14 is a block wall portion, 16 is a block side bearing surface, 18 is a case side bearing member, 20 is a case connecting member, 22 is a case side bearing surface, 24 is one side surface, 26 is a chain case, 2
Reference numeral 8 is a wall portion, 30 is an insertion hole, and 32 is an oil supply device.

The oil supply device 32 of the second embodiment is
As shown in FIGS. 7 to 10, an introduction passage 56 that connects the inside of the oil pan 10 and the suction passage 52 of the oil pump 36 is provided to the case side bearing member 18 on the one side surface 24 side in the crankshaft axis A direction of the lower case 8. It is provided.

The introduction passage 56 provided in the case side bearing member 18 is provided on one side in a direction intersecting with the crankshaft axis A with the case side bearing surface 22 sandwiched between the one end side and the oil pan 10 side end. The hole is communicated with the hole 118, and the other end side is communicated with the exit hole 122 of the introduction exit hole boss portion 120 provided on the rotor plate 44 side. A strainer mounting portion 124 for mounting the oil strainer 58 is provided around the inlet hole 118 at the end of the case side bearing member 18 on the oil pan 10 side.

The rotor plate 44 is provided with a seal boss portion 126 for communication with which the outlet hole boss portion 120 is brought into contact. The seal boss portion 126 is connected to the outlet hole 122 and communicates with the suction passage 56. Is provided
Seal fitting hole 1 having a diameter slightly larger than the communication hole 128
30 are provided.

The seal boss portion 126 of the rotor plate 44 has a seal step portion 1 around the seal fitting hole 130.
32 is provided and the fitting cylinder 1 for communicating with the seal fitting hole 130
An O-ring 136 is attached to the seal step portion 132 around the fitting cylinder 134 while press-fitting 34.

The fitting cylinder 134 is the chain case 2
The rotor plate 44 attached to the cylinder block 4
The O-ring 136 to the seal step 13
2 is held securely and is inserted into the outlet hole 122 provided in the outlet hole boss portion 120. The O-ring 136 is pressed against the outlet hole boss 120 around the outlet hole 122 to seal the outlet hole 122.

Next, the operation of the second embodiment will be described.

In the oil supply device 32 of the second embodiment, the case-side bearing member 18 of the lower case 8 is provided with the introduction passage 56 that communicates the inside of the oil pan 10 with the suction passage 52 of the oil pump 34. A strainer mounting portion 124 for mounting the oil strainer 58 is provided at the end of the introduction passage 56 on the oil pan 10 side.

The chain case 26 is attached to the cylinder block 4
At the time of installation, the fitting cylinder body 134 is press-fitted into the seal fitting hole 130 provided in the seal boss portion 126 of the rotor plate 44, and the O-ring 136 is mounted on the seal step portion 132 around the fitting cylinder body 134. To do.

The chain case 26 corresponds to the rotor plate 4
The fitting cylinder 134 of No. 4 is used as the outlet hole 12 of the outlet hole boss portion 120.
2 and insert the O-ring 136 into the outlet hole 12
(2) It is attached to the cylinder block 4 by being pressed against the outlet hole boss portion 120 around it.

As a result, the introduction passage 56 is formed in the outlet hole 12
2 is sealed by an O-ring 136, and the communication hole 128
Is communicated with the suction passage 52 via. The mounting flange 138 of the oil strainer 58 is mounted to the strainer mounting portion 124 provided on the case side bearing member 18 of the lower case 8 with a mounting bolt (not shown).

In the oil supply device 32 of the second embodiment, when the crankshaft 6 of the engine 2 drives the oil pump 34, the oil in the oil pan 10 is passed through the oil strainer 58 and the case side bearing member of the lower case 8 is used. 18 is introduced into the introduction passage 56 through the inlet hole 118, and the exit hole 122 of the introduction passage 56 is introduced into the suction passage 52 through the fitting cylinder 134 through the communication hole 128. The oil in the suction passage 52 is introduced into the pump chamber. It is sucked into 50, compressed, and discharged into the discharge passage 54.

The oil discharged to the discharge passage 54 is adjusted to the set pressure by the relief valve 62, and the surplus is returned to the oil pan 10 by the relief passage 60. The oil adjusted to the set pressure by the relief valve 62 is supplied to the main oil passage 76 via the oil filter 74 by the sub oil passage 64, and lubricates and cools the crank shaft 6, the cam shaft (not shown) and the like.

As described above, in the oil supply device 32 of the second embodiment, the inside of the oil pan 10 and the oil pump 34 are attached to the case side bearing member 18 of the lower case 8 which pivotally supports the crankshaft 6.
Of the case side bearing member 18 and an oil strainer 58 is attached to the end of the case side bearing member 18 on the oil pan 10 side.
24 are provided.

As a result, the oil supply device 32 of the second embodiment utilizes the case side bearing member 18 of the lower case 8 to introduce the oil in the oil pan 10 into the oil pump 34 and the oil strainer 58. A strainer mounting portion 124 for mounting the rotor plate 44 can be provided, and the introduction passage forming portion and the strainer mounting flange are not formed to project to the rotor plate 44 unlike the conventional case, and the chain case 26 to which the rotor plate 44 is mounted can be mounted. The protruding length L1 in the direction of the crankshaft axis A can be made shorter than the protruding length L of the conventional chain case (see FIG. 18) (L1 <L).

Therefore, the oil supply device 3 of the second embodiment
2 can shorten the overall length of the engine 2, can achieve the weight reduction of the engine 2, and can effectively utilize the dead space by utilizing the case side bearing member 18 of the lower case 8. .

The O-ring 136, which is pressed against the outlet hole boss 120 and seals the outlet hole 122, may be a gasket or a liquid gasket.

13 to 15 show a third embodiment of the present invention. In the third embodiment, the first
The portions having the same functions as those in the second embodiment will be described with the same reference numerals.

13 to 15, 2 is an engine,
4 is a cylinder block, 6 is a crank shaft, 8 is a lower case, 10 is an oil pan, 12 is a block side bearing member portion,
14 is a block wall portion, 16 is a block side bearing surface, 18 is a case side bearing member, 20 is a case connecting member, 22 is a case side bearing surface, 24 is one side surface, 26 is a chain case, 2
Reference numeral 8 is a wall portion, 30 is an insertion hole, and 32 is an oil supply device.

In the oil supply device 32 of the third embodiment, the discharge passage 54 of the oil pump 34 is provided in the case side bearing member 18 on the one side surface 24 side in the crankshaft axis A direction of the lower case 8.
A relief passage 60 that communicates between the inside of the oil pan 10 and the inside of the oil pan 10 is provided.

The relief passage 60 provided in the case side bearing member 18 has the introduction passage 5 with the case side bearing surface 22 interposed therebetween.
6 is provided on the other side in the direction opposite to the crankshaft axis A on the side opposite to 6, and is provided so as to communicate with the inlet hole 142 of the inlet hole boss portion 140 whose one end side is oriented toward the rotor plate 44 side. The end side is provided so as to communicate with an outlet hole 144 that is provided inside the chain case 26. In the middle of the relief passage 60 of the case side bearing member 18, a relief valve mounting hole 146 for mounting the relief valve 62 is provided.

The relief valve mounting hole 146 is provided in the relief passage 60 from the oil pan 10 side of the case side bearing member 18.
It is provided so as to point to. The relief valve 62 includes a relief valve body 148 that opens and closes the relief passage 60, and a relief spring 150 that biases the relief valve body 148 in a direction of closing the relief passage 60. Relief valve 62
Is mounted in the relief valve mounting hole 146 from the oil pan 10 side.

The rotor plate 44 is provided with a rotor boss portion 152 which comes into contact with the inlet hole boss portion 140 of the case side bearing member 18, and a communication hole which connects the discharge passage 54 and the inlet hole 142 to the rotor boss portion 152. 154 is provided.

Next, the operation of the third embodiment will be described.

In the oil supply device 32 of the third embodiment, the case-side bearing member 18 of the lower case 8 is provided with a relief passage 60 that connects the discharge passage 54 of the oil pump 34 and the oil pan 10 to each other. In the middle of the relief passage 60, a relief valve mounting hole 146 for mounting the relief valve 62 is provided. The relief passage 60 is provided such that one end thereof communicates with an inlet hole 142 provided so as to be oriented toward the rotor plate 44 and the other end thereof is connected to the chain case 26.
Is provided so as to communicate with the outlet hole 144 that is directed inward.

The chain case 26 is attached to the cylinder block 4
When the rotor boss portion 152 of the rotor plate 44 is brought into contact with the inlet hole boss portion 140 provided in the lower case 8, the communication hole 154 is attached so as to match the inlet hole 142.

As a result, the relief passage 60 is communicated with the discharge passage 54 through the communication hole 154 by the inlet hole 142.

In the oil supply device 32 of the third embodiment, when the crankshaft 6 of the engine 2 drives the oil pump 34, the oil in the oil pan 10 is passed through the oil strainer 58 to the case side bearing member of the lower case 8. The oil in the introduction passage 56 is introduced into the suction passage 52, the oil in the suction passage 52 is sucked into the pump chamber 50, compressed, and discharged into the discharge passage 54.

The oil discharged into the discharge passage 54 is introduced into the relief passage 60 from the communication hole 154 through the inlet hole 142, and is adjusted to the set pressure by the relief valve 62. Excess oil is discharged toward the inside of the chain case 26 from the outlet hole 144 of the relief passage 60 provided in the case side bearing member 18 of the lower case 8 and returned into the oil pan 10.

The oil adjusted to the set pressure by the relief valve 62 is supplied to the main oil passage 76 via the oil filter 74 by the sub oil passage 64, and the crankshaft 6 and the cam shaft (not shown) are lubricated and cooled. Fulfill.

As described above, in the oil supply device 32 of the third embodiment, the case side bearing member 18 of the lower case 8 which pivotally supports the crankshaft 6 connects the discharge passage 54 of the oil pump 34 and the oil pan 10 with each other. The relief passage 60 is provided,
A relief valve mounting hole 146 for mounting the relief valve 62 is provided in the middle of the relief passage 60 of the case side bearing member 18, and an outlet hole 144 of the relief passage 60 is provided so as to be directed to the inside of the chain case 26.

As a result, the oil supply device 32 of the third embodiment utilizes the case-side bearing member 18 of the lower case 8 to mount the relief passage 60 and the relief valve 62 for relief of the oil discharged from the oil pump 34. The valve mounting hole 146 can be provided, and unlike the conventional case, the relief passage forming portion and the relief valve mounting portion are not formed to be protruded and formed in the rotor plate 44, and the crank of the chain case 26 to which the rotor plate 44 is mounted can be mounted. The protruding length L2 in the axial direction A can be made shorter than the protruding length L of the conventional chain case (see FIG. 18) (L2 <L), and moreover, the case-side bearing member of the lower case 8 18, the introduction passage 56 and the strainer mounting portion 124
By providing and, it is possible to further shorten the protrusion length L1 of the second embodiment (L2 <L1).

Therefore, the oil supply device 3 of the third embodiment
2 makes it possible to reduce the overall length of the engine 2 and reduce the weight of the engine 2 as compared with the second embodiment, and the use of the case side bearing member 18 of the lower case 8 makes effective use of dead space. Further, since the outlet hole 144 of the relief passage 60 is provided so as to be directed to the inner side of the chain case 26, oil aeration by the crankshaft 6 can be reduced, and lubrication and cooling by oil can be achieved. The performance can be improved.

[0088]

As described above, the engine oil supply device of the present invention does not block the inlet hole of the oil supply passage provided in the block side bearing member of the cylinder block unlike the conventional PT plug, and The opening of the main oil passage can be closed without deforming the circumference of the opening of the main oil passage.

Therefore, this oil supply device can improve the sealing performance of the opening of the main oil passage, reduce the sealing failure, and install the oil supply passage provided in the block side bearing member of the cylinder block. The degree of freedom of position can be increased and the passage area of the oil supply passage can be secured, so that the sealability of the opening of the sub oil passage adjacent to the main oil passage can be improved.

Further, in the engine oil supply device of the present invention, the case side bearing member of the lower case is used to provide the introduction passage for introducing the oil in the oil pan into the oil pump and the strainer mounting portion for mounting the oil strainer. Unlike the conventional case, the introduction passage forming portion and the strainer mounting flange are not formed to project on the rotor plate as in the conventional case, and the length of the chain case to which this rotor plate is mounted is projected in the crankshaft axis direction. Can be shortened.

Therefore, this oil supply device can shorten the overall length of the engine and can reduce the weight of the engine, and the case side bearing member of the lower case can be used to effectively use the dead space. Can be achieved.

Further, the engine oil supply device of the present invention is provided with a relief passage for relieving the oil discharged from the oil pump and a relief valve mounting hole for mounting the relief valve by utilizing the case side bearing member of the lower case. Unlike the conventional case, the relief passage forming portion and the relief valve mounting portion are not formed to be projected on the rotor plate, and the length of the chain case to which the rotor plate is mounted is projected in the crankshaft axis direction. Can be shortened.

Therefore, this oil supply device can shorten the overall length of the engine, can achieve the weight reduction of the engine, and can effectively utilize the dead space by utilizing the case side bearing member of the lower case. By further providing the outlet hole of the relief passage so as to be directed to the inner side of the chain case, oil aeration by the crankshaft can be reduced, and the performance of lubrication / cooling by oil can be improved. .

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of an engine showing a first embodiment of an oil supply device according to the present invention.

FIG. 2 is a front view of an engine.

FIG. 3 is a rear view of the chain case.

FIG. 4 is a sectional view of a chain case.

5 is an enlarged sectional view taken along the arrow V in FIG.

FIG. 6 is a schematic front view of the engine.

FIG. 7 is a partially cutaway side view of an engine showing a second embodiment of the oil supply device according to the present invention.

8 is an enlarged cross-sectional view taken along the arrow VIII in FIG.

FIG. 9 is a front view of the engine.

FIG. 10 is a bottom view of the engine.

FIG. 11 is a rear view of the chain case.

FIG. 12 is a sectional view of a chain case.

FIG. 13 is a partially cutaway front view of an engine showing a third embodiment of the oil supply device according to the present invention.

FIG. 14 is a bottom view of the engine.

FIG. 15 is a partially cutaway side view of the engine.

FIG. 16 is a partially cutaway side view of an engine showing a conventional example.

FIG. 17 is a front view of the engine.

FIG. 18 is a bottom view of the engine.

FIG. 19 is a rear view of the chain case.

FIG. 20 is a sectional view of the chain case.

[Explanation of symbols]

2 engine 4 cylinder block 6 crankshaft 8 lower case 10 oil pan 12 Block side bearing member 18 Case side bearing member 26 chain case 32 Oil supply device 34 Oil pump 44 rotor case 52 Inhalation passage 54 Discharge passage 56 introduction passage 58 Oil strainer 60 relief passage 62 relief valve 64 sub oil passage 76 Main oil passage 80 openings 84 Oil supply passage 90 Sealing means 98 Fitting cylinder 100 O-ring

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02F 7/00 F02F 7/00 N

Claims (2)

[Claims] 1. A cylinder case of an engine is provided with a lower case for pivotally supporting a crankshaft, an oil pan is provided for attachment to the lower case, and a chain case for covering a timing chain is attached to one side in the axial direction of the crankshaft of the engine. An oil pump that is driven by the crankshaft to suck the oil in the oil pan is provided inside the chain case, and the pump housing portion of the oil pump is provided in the chain case. An inner rotor and an outer rotor that is externally mounted on the inner rotor and rotates together, and is rotatably built in. A rotor plate is attached so as to cover the inner rotor and the outer rotor. Set the bearing member inside the oil pan and An introduction passage communicating with the suction passage in the pump housing, a strainer attachment portion is provided at an oil pan side end of the introduction passage, a strainer is attached to the strainer attachment portion, and an oil pan of the oil pan is provided through the oil strainer. An oil supply device for an engine, wherein oil is introduced from an introduction passage provided in a case side bearing member adjacent to the rotor plate to an intake passage arranged between the chain case and the rotor plate. 2. A lower case for pivotally supporting a crankshaft is provided on a cylinder block of an engine, an oil pan is provided on the lower case, and a chain case for covering a timing chain is attached to one side surface of the engine in the axial direction of the crankshaft. An oil pump that is driven by the crankshaft to suck the oil in the oil pan is provided inside the chain case, and the pump housing portion of the oil pump is provided in the chain case. A rotatably built-in inner rotor and an outer rotor that is externally mounted on the inner rotor and rotates together, and is provided with a rotor plate attached so as to cover the inner rotor and the outer rotor. On the side bearing member, the discharge of the oil pump A relief passage that connects the outlet passage and the inside of the oil pan is provided, a relief valve mounting hole is provided in the middle of the relief passage, and a relief valve is mounted in the relief valve mounting hole to connect the rotor plate and the chain case. The oil discharged into the discharge passage of the oil pump provided therebetween is adjusted to the set pressure by the relief valve in the relief passage provided in the case side bearing member adjacent to the rotor plate and returned to the oil pan. The oil supply device for the engine, which is characterized in that