JP4075074B2 - Oil passage structure of internal combustion engine - Google Patents

Description

  The present invention relates to an oil passage structure of an internal combustion engine, and more particularly to an oil passage structure of an internal combustion engine that guides oil to an oil control valve that operates a hydraulic actuator of a variable valve timing device.

  In an internal combustion engine of a vehicle, a crankshaft is provided on a cylinder block, a crank timing sprocket is provided on the crankshaft, and a camshaft that opens and closes an intake / exhaust valve is provided on a cylinder head placed on the cylinder block. This camshaft is provided with a cam sprocket, a timing chain is wound around the crank timing sprocket and the cam sprocket, and the cylinder block and the cylinder head are formed so as to cover the timing chain and form a chain chamber. There is a type in which a covering member is provided and an oil pump is provided on the crankshaft on the cylinder block side.

  In recent years, some internal combustion engines of vehicles are provided with a variable valve timing device that varies the valve timing of intake and exhaust valves in order to improve various functions required.

  In this variable valve timing device, as shown in FIG. 11, an oil pump 204 and a crank timing sprocket 206 are provided on the crankshaft 202, and intake and exhaust cam sprockets 212 are provided on the intake and exhaust camshafts 208 and 210, respectively. 214, a timing chain 216 is wound around the crank timing sprocket 206 and the intake and exhaust cam sprockets 212 and 214, and a hydraulic actuator 218 as a hydraulic device is provided at an end portion of the intake camshaft 208. An oil control valve 220 for operating the oil control valve is provided in a cylinder head (not shown), and a control means (ECU) 222 for operating the oil control valve 220 is provided. This control means 222 communicates with the crank angle sensor 224 and the cam angle sensor 226, calculates the optimal valve timing according to the operating state of the internal combustion engine (not shown), and operates the oil control valve 220 to provide hydraulic pressure. The hydraulic pressure to the actuator 218 is controlled, and the phase between the intake cam and the crankshaft 202 is varied.

  In this case, as shown in FIG. 12, in order to guide the oil from the oil pump 204 on the cylinder block side to the oil control valve 220 on the cylinder head side, the one-side pipe connecting portion 230 on one end side of the oil pipe 228 is connected to one side. The union bolt 232 is attached to the cylinder block 234, and the other pipe connecting portion 236 on the other end side of the oil pipe 228 is attached to the intake cam cap 240 that holds the intake cam shaft 208 by the other side union bolt 238. The oil pipe 228 appears outside the internal combustion engine and is externally attached.

Conventionally, in such an oil passage structure, there is an internal combustion engine in which an oil pump is provided in a lower part of a cylinder block, in which an oil passage is formed in a chain cover that is a covering member.
Some oil passage structures have a plurality of linear communication pipes connected to the oil gallery of the crankcase.
Furthermore, there is an oil passage structure in which a hydraulic control valve, which is an oil control valve, is disposed in a dead space of a cylinder block.
Furthermore, there is an oil passage structure in which an oil passage is formed in a cylinder head in an internal combustion engine having a variable valve timing device.
Some oil passage structures have a lubricating oil pipe disposed in a crankcase.
Japanese Utility Model Publication No. 5-6112 Japanese Patent Laid-Open No. 8-232625 Japanese Patent Laid-Open No. 8-28231 JP-A-9-170415 Japanese Utility Model Publication No. 62-179314

  By the way, conventionally, in an internal combustion engine equipped with a variable valve timing device, when an oil pipe is disposed outside the internal combustion engine from the main gallery formed in the cylinder block as an oil passage system to the oil control valve, When oil leaks due to the oil pipe being externally attached, there is an inconvenience that the oil leaks outside the internal combustion engine, and when an oil passage is formed in the cylinder block or cylinder head by a dedicated processing hole. Requires special cylinder blocks and cylinder heads, and requires processing equipment. Also, the design freedom is reduced, and the cylinder block is processed with a dedicated machine. Therefore, if there is an addition or change in the processing hole, the processing line must be remodeled. There is a disadvantage that hear. Further, in the above-mentioned Patent Document 1, since the oil from the oil pump is sent to the oil control valve as it is without being filtered, there is a problem that the oil control valve is likely to malfunction.

According to the present invention, an oil filter is attached to a cylinder block of an internal combustion engine, a crankshaft is pivotally supported on the cylinder block, a crank timing sprocket is attached to the crankshaft, and a camshaft is pivoted on a cylinder head placed on the cylinder block. A hydraulic actuator of a variable valve timing device and a cam sprocket are attached to the cam shaft, a timing chain is wound around the crank timing sprocket and the cam sprocket, and the timing is straddled across the cylinder block and the cylinder head. An enveloping member that covers the chain is attached, an oil control valve that controls the oil pressure from the oil pump to the hydraulic actuator is attached to the outer wall surface of the enveloping member, and an engine mount bracket portion that mounts the internal combustion engine is provided. In the oil passage structure of the internal combustion engine, when the internal combustion engine is seen through from the axial direction of the crankshaft, the oil control valve is positioned so as to overlap the cylinder head and the engine mount bracket portion with respect to the crankshaft. When the internal combustion engine is viewed from a direction orthogonal to the crankshaft, the oil pump is disposed adjacent to the timing chain and the oil filter is disposed more than the timing chain. The oil pump is disposed near the center of the crankshaft, and when the water pump and alternator disposed in the internal combustion engine are driven by a belt, and the internal combustion engine is seen through from the axial direction of the crankshaft, the oil pump is attached to the belt At the position surrounded by the oil, and the oil to the oil control valve Characterized in that by way between serial belt and the timing chain.

  The oil passage structure of the internal combustion engine according to the present invention can guide oil from the lower part of the cylinder block to the oil control valve without changing the shape or the like of the existing cylinder block.・ No investment is required, so capital investment can be reduced, and oil filtered by the oil filter can be supplied to the oil control valve. The function of the oil control valve can be maintained well without causing malfunction.

The present invention achieves the object of eliminating the need for modification / investment of processing equipment by providing an oil passage in the encapsulating member.
Embodiments of the present invention will be described in detail and specifically with reference to the drawings.

  1 to 10 show an embodiment of the present invention.

  1, 2, 8 and 9, 2 is a multi-cylinder internal combustion engine mounted on a vehicle (not shown), 4 is a cylinder block, 6 is a cylinder head, 8 is a cylinder head cover, 10 is a cam chamber, 12 Is a breather chamber, and 14 is an oil pan. The cylinder block 4 includes an upper first cylinder block 4-1 that supports the crankshaft 16 and a lower second cylinder block (crank lower case) 4-2.

  As shown in FIGS. 1 and 2, for example, three cylinders 18 are formed in series in the first cylinder block 4-1. A spark plug 20 is attached to the cylinder head 6 corresponding to each cylinder 18.

  A crank pulley 22 is attached to the crankshaft 16 at one end side by a pulley mounting bolt 24, and a flywheel 26 is attached to the other end side by a wheel mounting bolt 28. 30 base end sides are attached. A piston 32 that reciprocates in the cylinder 18 is attached to the leading end side of the connecting rod 30.

  A combustion chamber 34 is formed in the cylinder head 6 corresponding to each cylinder 18.

  The cylinder head 6 is provided with an intake manifold 36, an air cleaner 38, and an intake resonator 40, and an exhaust manifold 44 including an oxygen sensor 42 and an engine mount bracket portion 46 are attached.

  A water pump 52 including a water pump pulley 48 and a cooling pipe 50 and an alternator 56 including an alternator pulley 54 are attached to the cylinder block 4. A V belt 58 is wound around the crank pulley 22, the water pump pulley 48, and the alternator pulley 54.

  An oil sensor 60 that detects oil temperature or oil pressure is attached to the second cylinder block 4-2.

  A crank timing sprocket 62 and an oil pump 64 are attached to one end side of the crankshaft 16.

  In the oil pump 64, a rotor chamber 68, a suction port 70, and a discharge port 72 are formed by an enveloping member 108 to be described later from the outside and a pump plate 66 from the inside. The pump plate 66 is attached to the inner surface of the encapsulating member 108 with a plate attachment screw 74. The rotor chamber 68 accommodates an inner rotor and an outer rotor (not shown). A relief valve 76 is attached to the encapsulating member 108 at the portion of the discharge port 72.

  A proximal end side of a suction pipe 78 communicating with the suction port 70 is attached to the second cylinder block 4-2 with a pipe mounting bolt 80. The suction pipe 78 is provided with an oil strainer 82 located at the bottom of the oil pan 14 at the front end side.

  On the upper part of the cylinder head 6, intake and exhaust cam shafts 84 and 86 are provided to be supported in parallel. The intake camshaft 84 operates an intake valve 88 that opens and closes the combustion chamber 34. The exhaust camshaft 86 operates an exhaust valve 90 that opens and closes the combustion chamber 34. An intake cam sprocket 92 is attached to one end side of the intake cam shaft 84 by an intake side mounting bolt 94. An exhaust cam sprocket 96 is attached to one end side of the exhaust cam shaft 86 with an exhaust side mounting bolt 98.

  A timing chain 100 is wound around the crank timing sprocket 62, the intake cam sprocket 92, and the exhaust cam sprocket 96.

  In addition, a hydraulic actuator 102 of a variable valve timing device is attached to the intake camshaft 84 by an intake side mounting bolt 94 as a hydraulic device.

  For example, a crank angle sensor 104 that detects rotation of the intake cam sprocket 92 as a crank angle is attached to the cylinder head 6.

  An encapsulation member 108 is attached to the cylinder block 4 and the cylinder head 6 so as to cover the timing chain 100 and form a chain chamber 106. The enveloping member 108 is made of an aluminum material, and is made of a chain cover or an oil pump case. A cylinder head cover 8 is placed on the upper surface of the enveloping member 108.

  In the enveloping member 108, an oil control valve 112 is provided by a valve mounting bolt 114 on a valve mounting boss 110 at a height position of the cylinder head 6. The oil control valve 112 is operated by a control means (not shown), and controls the hydraulic pressure to the hydraulic actuator 102 to adjust the valve timing.

  As shown in FIGS. 4 to 6, a main gallery 116 and a sub gallery 118 are formed in the second cylinder block 4-2 so as to be oriented in the axial direction of the crankshaft 16.

  As shown in FIGS. 5 and 6, the sub gallery 118 is disposed outside the main gallery 116, that is, on the side away from the oil pump 64. The sub gallery 118 communicates with a first sub gallery communication hole 120 formed in the encapsulating member 108 in the axial direction of the crankshaft 6 as a downstream passage of the oil pump 64 and the first sub gallery communication hole 120. The crankshaft 16 communicates with a second sub-gallery communication hole 122 formed in the encapsulating member 108 in a direction orthogonal to the crankshaft 16. The second sub-gallery communication hole 122 is closed at one end side by a blind plug 124 and communicated with the discharge port 72 at the other end side.

  Further, as shown in FIGS. 5 and 6, the main gallery 116 is disposed on the inner side on the oil pump 64 side than the sub gallery 118, and is formed in the encapsulating member 108 in parallel with the first sub gallery communication hole 120. One main gallery communication hole 126 communicates. The first main gallery hole 126 is formed without penetrating the encapsulating member 108. A second main gallery communication hole 128 formed in the encapsulating member 108 so as to open obliquely to the chain chamber 106 communicates with a deep part of the first main gallery communication hole 126. The second main gallery communication hole 128 is formed in a screw hole for attaching a union bolt 132 described later. Therefore, the first and second main gallery communication holes 126 and 128 communicate with the main gallery 116 through the joint portion 108 </ b> A with the cylinder block 4 inside the enveloping member 108 and reach the oil control valve 112. An oil passage is formed.

  Further, as shown in FIG. 8, the second cylinder block 4-2 is provided with an oil filter 130 that flows in oil from the sub gallery 118 and filters the oil to flow out to the main gallery 116. .

  A union bolt 132 is attached to the second main gallery communication hole 128 of the encapsulating member 108.

  The union bolt 132 is provided with a pipe connecting portion 136 on one end side of the oil pipe 134 fitted therein.

  The oil pipe 134 is made of an iron material, has a linear expansion coefficient different from the linear expansion coefficient of the enveloping member 108, is disposed in the chain chamber 106, and the other end side is connected to the enveloping member by a connection mounting bolt 138. It is connected to a pipe connecting member 140 attached to 108. The pipe connecting member 140 is formed with a communication oil passage 142 communicating with the oil control valve 112.

  The oil pipe 134 is formed with first to third bent portions 144-1 to 144-3 so as to avoid interference with the oil pump 64 on one end side on the second cylinder block 4-2 side. At the same time, the other end of the cylinder head 6 is formed in a substantially linear shape along the timing chain 100.

  Further, inside the enveloping member 108, as shown in FIGS. 1, 4 and 10, the oil from the oil control valve 112 is guided to the hydraulic actuator 102 via the joint portion 108B with the cylinder head 6. A hydraulic communication passage 146 and retard and advance passages 148 and 150 are formed.

  Next, the operation of this embodiment will be described.

  By driving the oil pump 64, the oil in the oil pan 14 is sucked from the oil strainer 82, fed from the suction port 70 to the discharge port 72, and then sublimated from the second and first sub gallery communication holes 122, 120. Through the gallery 118, the oil filter 130 is reached, impurities are removed by the oil filter 130, and the impurities are sent to the main gallery 116. Further, the oil pipe 134 is passed through the first main gallery communication hole 126 and the second main gallery communication hole 128. To the oil control valve 112. Further, the cylinder block 4 is provided with a lubricating path for lubricating each part of the internal combustion engine 2 from the main gallery 116 in parallel with the oil pipe 134.

  The oil control valve 112 is operated by the control means under various conditions such as the engine speed, the accelerator opening degree, and the water temperature, and adjusts the hydraulic pressure to the retarded oil passage 148 and the advanced oil passage 150 to control the hydraulic actuator 102. Operate to ensure proper valve timing.

  By the way, according to the configuration of this embodiment, the oil control valve can be started from the lower part of the cylinder block 4 without changing the shape or the like to the existing first and second cylinder blocks 4-1 and 4-2. Since the oil can be guided to 112, it is not necessary to remodel / invest in the processing equipment, and the equipment investment can be reduced.

  In addition, since the oil filtered by the oil filter 130 can be supplied to the oil control valve 112, the oil control valve 112 does not cause galling, locking, or malfunction due to foreign matter, and the function of the oil control valve 112 is prevented. Can be maintained well.

  Furthermore, since the first and second sub gallery communication holes 120 and 122, the first main gallery communication hole 126, and the second main gallery communication hole 128 are formed in the encapsulating member 108, the process of drilling the cylinder block 4 is reduced. In addition, the shape of the cylinder block 4 can be simplified.

  An oil passage is provided in the enveloping member attached to the internal combustion engine, and the present invention can be applied to other structures.

It is sectional drawing of an internal combustion engine. It is a top view of the internal combustion engine of FIG. It is a schematic front view of an internal combustion engine. It is a figure from the inner side of the enveloping member. It is a principal part enlarged view of FIG. It is an expanded sectional view by the VI-VI line of FIG. It is a schematic front view of an internal combustion engine. It is a side view of an internal combustion engine. It is a front view of the internal combustion engine of FIG. It is a principal part expanded sectional view of FIG. It is a block diagram of the conventional variable valve timing apparatus. It is a figure which shows the attachment state of the external oil pipe conventionally.

Explanation of symbols

2 Internal combustion engine 4 Cylinder block 6 Cylinder head 16 Crankshaft 64 Oil pump 84 Intake camshaft 86 Exhaust camshaft 100 Timing chain 102 Hydraulic actuator 106 Chain chamber 108 Encased member 112 Oil control valve 116 Main gallery 118 Sub gallery 120 First sub Gallery communication hole 122 Second sub-gallery communication hole 126 First main gallery communication hole 128 Second main gallery communication hole 130 Oil filter 134 Oil pipe

Claims (2)

An oil filter is attached to a cylinder block of an internal combustion engine, a crankshaft is pivotally supported on the cylinder block, a crank timing sprocket is attached to the crankshaft, and a camshaft is pivotally supported on a cylinder head placed on the cylinder block. A hydraulic actuator of a variable valve timing device and a cam sprocket are attached to the camshaft, a timing chain is wound around the crank timing sprocket and the cam sprocket, and the timing chain is covered across the cylinder block and the cylinder head. An internal combustion engine having an engine mount bracket portion for mounting the internal combustion engine, the mounting member being mounted, an oil control valve for controlling the hydraulic pressure from the oil pump to the hydraulic actuator being mounted on the outer wall surface of the envelope member In the oil passage structure, when the internal combustion engine is seen through from the axial direction of the crankshaft, the oil control valve is positioned so as to overlap the cylinder head and is at the same height as the engine mount bracket portion with respect to the crankshaft. Further, when the internal combustion engine is viewed from a direction orthogonal to the crankshaft, the oil pump is disposed adjacent to the timing chain and the oil filter is disposed closer to the crankshaft than the timing chain. When the water pump and the alternator arranged near the center are driven by a belt and the internal combustion engine is seen through from the axial direction of the crankshaft, the oil pump is substantially surrounded by the belt. The oil to the oil control valve and the belt. Oil passage structure for an internal combustion engine, characterized in that by way between the serial timing chain. 2. The internal combustion engine oil according to claim 1 , wherein the cylinder block includes an upper first cylinder block and a lower second cylinder block, and the oil filter is provided in the second cylinder block. Passage structure.

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