JP2000282829A - Lubricating device for timing chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress number of attaching parts, improve workability of screwing and assemblability, and reduce cost by arranging on a hollow pipe, a positioning member which is engaging-supported to a cylinder block so as to direct a nozzle hole to an engaging part. SOLUTION: A block fitting part 58a of a longitudinal direction each end of an oil jet 56 made of a hollow pipe 56 and a cover fitting part 58b are fitted and supported to a block side fitting hole 66 of a cylinder block 4 and a cover fitting hole 72 of a chain cover 46. An engaging protrusion 84 of the cylinder block 4 is engaged and supported to by an engaging hole 80 of a positioning member 78 disposed on the hollow pipe 58, and it is attached by positioning it on the cylinder block 4 so as to direct the nozzle hole 64 to an engaging part 54. When the hollow pipe 58 of the oil jet 56 and the positioning member 78 are attached, a lubricating device 52 is easily attached by fitting work and engaging work, without requiring pressure work or screwing work, and machining of the screw hole is dispensed with.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating apparatus for a timing chain, and more particularly to a timing chain lubricating apparatus capable of improving the assemblability of an oil jet, reducing the number of parts and processing steps, and reducing the cost. The present invention relates to a chain lubrication device.

[0002]

2. Description of the Related Art Some engines mounted on vehicles and the like are provided with a timing chain for transmitting rotation of a crankshaft to a camshaft. As lubricating devices for this timing chain, there are those shown in FIGS.
9 and 10, reference numeral 102 denotes an engine, 104 denotes a cylinder block, 106 denotes a cylinder head, 108 denotes a head cover, 110 denotes a crankshaft, 112 denotes an intake camshaft, and 114 denotes an exhaust camshaft.

The engine 102 is provided with a crank sprocket 116 attached to a crankshaft 110, and intake and exhaust cam sprockets 1 attached to intake and exhaust camshafts 112 and 114.
The timing chain idler sprocket 124 and the cam chain idler sprocket 126 are pivotally mounted on idler mounting bolts 122 mounted on the cylinder head 106.

A timing chain 128 is wound around the crank sprocket 116 and the timing chain idler sprocket 124. A cam chain 130 is wound around the intake and exhaust cam sprockets 118 and 120 and the cam chain idler sprocket 126. The timing chain 128 transmits the rotation of the crankshaft 110 to the intake / exhaust camshafts 112 and 114 via the camchain 130.

[0005] The engine 102 is provided with a chain cover 132 attached to the cylinder block 104 and the cylinder head 106 so as to cover the timing chain 128 and the cam chain 130, thereby forming a chain chamber 134. The chain cover 132 is shown in FIGS.
As shown in FIG. 1, it is positioned and attached by two knock pins 136.

[0006] The engine 102 is provided with a lubricating device 138 for the timing chain 128. Lubrication device 1
Reference numeral 38 denotes an oil jet 14 for injecting lubricating oil to a meshing portion 140 between the crank sprocket 116 and the timing chain 128 as shown in FIGS.
2 are provided.

[0007] The oil jet 142 is formed by a hollow pipe 144 having a closed cylindrical shape and one end of which is attached to the cylinder block 104 in the longitudinal direction. This hollow pipe 144
An injection oil passage 148 to which oil is supplied from an oil supply passage 146 of the cylinder block 104 is provided, and a nozzle hole 150 for injecting the oil in the injection oil passage 148 toward the engagement portion 140 is provided.

[0008] The hollow pipe 144 is a cylinder block 1
By fitting one end in the longitudinal direction into the block-side fitting hole 152 communicating with the oil supply passage 146 of the nozzle 04, the oil supply passage 146 is connected to the injection oil passage 148 and attached.

The hollow pipe 144 of the oil jet 142 is provided with a mounting member 154 which is mounted on the cylinder block 104 so that the nozzle hole 150 is directed toward the engagement portion 140. The mounting member 154 is provided in the mounting hole 1.
The mounting bolt 158 inserted into the cylinder block 1
By screwing into the screw hole 160 of the cylinder 04, the nozzle hole 150 of the hollow pipe 144 is positioned and attached to the cylinder block 104 so as to direct the nozzle hole 150 to the meshing portion 140.

The lubricating device 13 of the timing chain 128
8 is an oil supply passage 146 of the cylinder block 104.
The oil is supplied to the injection oil passage 148 of the oil jet 142 from the nozzle hole 150, and the lubricating oil is injected from the nozzle hole 150 to the meshing portion 140 between the crank sprocket 116 and the timing chain 128 so that the crank sprocket 116 and the timing chain 128 Lubricate.

As a lubricating device for such a timing chain, Japanese Patent Application Laid-Open No. 7-54969, Japanese Utility Model Publication No. 7-4
No. 4726 is disclosed.

Japanese Unexamined Patent Publication No. 7-54969 discloses a lug in which a lubricating oil supplied from a lubricating oil supply passage of a cylinder block is provided on a chain cover with a projection abutting on a pressure cylinder block. It is provided with a nozzle for jetting toward the sprocket.

[0013] Japanese Utility Model Publication No. Hei 7-44726 discloses a structure in which an oil pump body attached to a cylinder block is provided with a jet hole for blowing oil toward a timing chain, and the jet hole and an oil gallery in the cylinder block are provided. Are provided in the cylinder block and the oil pump body, respectively, and a positioning hollow pin inserted into the oil communication is provided.

[0014]

By the way, as shown in FIGS.
In the lubricating device 138 shown in FIG. 13, the hollow pipe 144 and the attachment member 154 of the oil jet 142 are formed as small components from the functional or space perspective.

At the time of assembly, the crank sprocket 116
In the narrow space between the oil jet 142 and the timing chain 128,
While holding down 44, the mounting bolt 158 is inserted into the mounting hole 156 of the mounting member 154, and is screwed into the screw hole 160 of the cylinder block 104 for mounting.

For this reason, the conventional lubricating device 138 is inferior in workability due to the necessity of holding down and screwing in parts at the time of mounting, and has a disadvantage of lowering the assemblability. Further, the conventional lubricating device 138 requires a mounting bolt 158 for mounting the mounting member 154 to the cylinder block 104 and also requires machining of a screw hole 160 into which the mounting bolt 158 is screwed to the cylinder block 104. Accordingly, there is a disadvantage that the number of parts and the number of processing steps are increased, and a cost is increased.

[0017]

SUMMARY OF THE INVENTION Therefore, in order to eliminate the above-mentioned disadvantages, the present invention provides a cylinder block of an engine which is supported by a crankshaft and a camshaft which is supported by a cylinder head of the engine. A timing chain that is wound around a crank sprocket attached to the crankshaft and transmits the rotation of the crankshaft to the camshaft, and is attached to the cylinder block and the cylinder head so as to cover the timing chain. A lubricating device for a timing chain, wherein an oil jet for injecting lubricating oil is provided at a meshing portion between the crank sprocket and the timing chain. Hollow pie with each end fitted and supported The hollow pipe is provided with an injection oil passage to which oil is supplied from an oil supply passage of the cylinder block, and a nozzle hole for injecting the oil of the injection oil passage toward the engagement portion is provided. A positioning member engaged with and supported by the cylinder block is provided in the hollow pipe so as to direct a hole toward the engagement portion.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The timing chain lubricating apparatus of the present invention is provided with an oil jet composed of a hollow pipe whose longitudinal ends are fitted and supported on a cylinder block and a chain cover, respectively. A cylinder for providing an injection oil passage to which oil is supplied from an oil supply passage of the cylinder block, and a nozzle hole for injecting the oil of the oil passage for injection toward the engagement portion, and directing the nozzle hole toward the engagement portion. By providing the hollow pipe with the positioning member engaged and supported by the block, the fitting operation and the screwing operation are not required when attaching the hollow pipe and the positioning member of the oil jet as in the related art. It can be easily installed by joint work. The screwing holes can be eliminated,
In addition, since the hollow pipe of the oil jet is supported at two points by the cylinder block and the chain cover, the hollow pipe can be firmly assembled, and the hollow pipe can function as a knock pin of the chain cover. , The number of knock pins can be reduced.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention. 3 and 4, reference numeral 2 denotes an engine, 4 denotes a cylinder block, 6 denotes a cylinder head, and 8 denotes a cylinder head cover. In the engine 2, a crankshaft 10 is supported on a cylinder block 4, and an intake camshaft 12 and an exhaust camshaft 14 are supported on a cylinder head 6.

The engine 2 includes a crank sprocket 16 and a crank pulley 1
8 are provided by mounting bolts 20, and intake / exhaust cam sprockets 22 and 24 are provided and attached to one longitudinal end of the intake / exhaust camshafts 12 and 14, respectively. In the engine 2, an idler support bolt 26 is attached to one end of the cylinder head 6 in the longitudinal direction, and a timing chain idler sprocket 28 and a cam chain idler sprocket 30, which are integrally formed, are pivotally connected to the idler mounting bolt 26. Provided to support.

A timing chain 32 is wound around the crank sprocket 16 and the timing chain idler sprocket 28. A cam chain 34 is wound around the intake / exhaust cam sprockets 22 and 24 and the cam chain idler sprocket 30. The timing chain 32 wound around the crank sprocket 16 transmits the rotation of the crankshaft 10 to the intake and exhaust camshafts 12 and 14 via the cam chain 34. Reference numeral 36 denotes a timing chain tensioner, reference numeral 38 denotes a timing chain guide, and reference numeral 40 denotes a cam chain tensioner.

The engine 2 is provided with a chain cover 46 attached to the block end face 42 and the head end face 44 at one longitudinal end of the cylinder block 4 and the cylinder head 6 so as to cover the timing chain 32 and the cam chain 34. A chain chamber 48 is formed and provided. As shown in FIG. 3, the chain cover 46 is positioned and attached by one knock pin 50 and a hollow pipe 58 described later.

The engine 2 is provided with a lubricating device 52 for the timing chain 32. As shown in FIGS. 1 and 2, the lubricating device 52 is provided with an oil jet 56 for injecting lubricating oil to a meshing portion 54 between the crank sprocket 16 and the timing chain 32.

The oil jet 56 comprises a cylindrical hollow pipe 58 whose longitudinal ends are fitted and supported by the cylinder block 4 and the chain cover 46, respectively. The hollow pipe 58 has a block fitting portion 58a at one longitudinal end.
Is provided, and a cover fitting portion 58b is provided at the other end in the longitudinal direction,
An injection oil passage 62 to which oil is supplied from an oil supply passage 60 of the cylinder block 4 is provided, and a nozzle hole 64 for injecting the oil in the injection oil passage 62 toward the engagement portion 54 is provided.

The cylinder block 4 is provided with the oil supply passage 60 through which oil supplied from an oil pump (not shown) flows, and a block-side fitting hole 66 communicating with the oil supply passage 60 is formed in the block end surface 42. It is provided. The chain cover 46 is provided with a cover-side boss portion 70 at a portion of the cover end surface 68 facing the block end surface 42 and facing the block-side fitting hole 66,
The cover side boss 70 has a cover side fitting hole 72 facing the block side fitting hole 66.

The hollow pipe 58 is fitted with a block fitting portion 58a at one end in the longitudinal direction into the block fitting hole 66 of the cylinder block 4 and is fitted into the cover side fitting hole 72 of the chain cover 46 at the other end in the longitudinal direction. Cover fitting portion 58b
The oil supply passage 60 communicates with the injection oil passage 62 to be supported. Hollow pipe 58
The block-side fitting hole 66 and the block fitting portion 58a are sealed by the block-side O-ring 74, and the cover-side fitting hole 72 and the cover fitting portion 58b are sealed by the cover-side O-ring 76. .

The hollow pipe 5 of the oil jet 56
8, a long plate-shaped positioning member 78 that is engaged and supported by the cylinder block 4 so as to direct the nozzle hole 64 toward the engagement portion 54 is provided. The long plate-shaped positioning member 78 is fixed to one end of the hollow pipe 58 so as to be parallel to the block end surface 42 of the cylinder block 4 and the other end is directed in the radial direction of the hollow pipe 58, and is provided integrally therewith. An engagement hole 80 is provided on the other end side. A block-side boss portion 82 is provided on the block end surface 42 of the cylinder block 4 near the block-side fitting hole 66, and the block-side boss portion 82 has an engagement protrusion 84 to be engaged with the engagement hole 80. It is provided so as to protrude.

The positioning member 78 is positioned on the cylinder block 4 so that the nozzle hole 64 of the hollow pipe 58 is directed toward the engagement portion 54 by engaging the engagement projection 84 of the cylinder block 4 with the engagement hole 80. Supported.

Next, the operation will be described.

The lubricating device 52 of the timing chain 32
Is supplied from the oil supply passage 60 of the cylinder block 4 to the injection oil passage 62 of the oil jet 56, and the lubricating oil is injected from the nozzle hole 64 to the meshing portion 54 between the crank sprocket 16 and the timing chain 32. , Lubricate the crank sprocket 16 and the timing chain 32.

The lubricating device 5 of the timing chain 32
2 is a block-side fitting hole 66 of the cylinder block 4 in which the block fitting portion 58a and the cover fitting portion 58b at each longitudinal end of the oil jet 56 composed of the hollow pipe 58 are connected.
And the cover side fitting hole 72 of the chain cover 46, respectively, and the fitting projection 8 of the cylinder block 4 is fitted into the fitting hole 80 of the positioning member 78 provided integrally with the hollow pipe 58.
By engaging and supporting the nozzle 4, the nozzle hole 64 is positioned and attached to the cylinder block 4 so as to direct the nozzle hole 64 to the engagement portion 54.

Accordingly, the lubricating device 52 does not require a pressing operation or a screwing operation when mounting the hollow pipe 58 or the positioning member 78 of the oil jet 56 as in the prior art, and a fitting operation and an engaging operation. It can be easily mounted by the industry, and the processing of a conventional mounting bolt and a screw hole for screwing the mounting bolt can be eliminated.

The lubricating device 52 supports the hollow pipe 58 of the oil jet 56 at two points by the cylinder block 4 and the chain cover 46.
The hollow pipe 58 can be firmly attached, and the hollow pipe 58 can be used as a knock pin of the chain cover 46 by using the firmly attached hollow pipe 58, and the chain cover 46 can be positioned. The number can be reduced.

Therefore, the lubricating device 52 of the timing chain 32 can improve the assemblability of the oil jet 56, reduce the number of parts and the number of processing steps, and reduce the cost.

FIGS. 5 and 6 show a second embodiment of the present invention. In the lubricating device 52 of the second embodiment, a short flat plate-shaped positioning member 86 that is engaged and supported by the cylinder block 4 is provided in the hollow pipe 58 of the oil jet 56 so as to direct the nozzle hole 64 to the meshing portion 54. .

The positioning member 86 in the form of a short flat plate is integrally provided with one end fixedly and in parallel to the longitudinal direction of the hollow pipe 58 and oriented in the radial direction, and has the other end as a free end. On the block end surface 42 of the cylinder block 4, an engagement groove 88 that is directed in the radial direction of the block-side fitting hole 66 is formed so as to be depressed.

The positioning member 86 includes the cylinder block 4
The hollow pipe 58 is engaged with the engagement groove 88 of the hollow pipe 58.
The nozzle hole 64 is positioned and attached to the cylinder block 4 so as to direct the nozzle hole 64 toward the engagement portion 54.

As described above, the lubricating device 52 of the second embodiment is used.
Is provided with a positioning member 86 having a short flat plate shape in the hollow pipe 58 of the oil jet 56, and an engagement groove 88 in which the positioning member 86 is engaged so as to direct the nozzle hole 64 to the engagement portion 54. 42 is provided.

For this reason, the lubricating device 52 of the second embodiment is
The same effect as that of the first embodiment can be obtained, and the positioning can be performed while shortening the positioning member 86 as compared with the first embodiment. Since the side bosses 82 and the engagement projections 84 can be omitted, the number of processing steps, the number of parts, and the weight can be reduced.

FIGS. 7 and 8 show a third embodiment of the present invention. The lubricating device 52 of the third embodiment includes a block fitting portion 58a of the hollow pipe 58 of the oil jet 56.
And the cover fitting portion 58b are formed in irregular shapes,
The block-side fitting hole 66 and the cover-side fitting hole 72 are formed in different shapes.

7 and 8, the oil jet 5
A block fitting portion 58a and a cover fitting portion 58b each having a hexagonal tubular cross section are formed and provided at each longitudinal end of the six hollow pipes 58. In the cylinder block 4, a block-side fitting hole 66 having a hexagonal cross section communicating with the oil supply passage 60 is formed on the block end surface 42. The chain cover 46 is provided with a cover-side boss portion 70 at a portion of the cover end surface 68 facing the block end surface 42 and facing the block-side fitting hole 66, and the cover-side boss portion 70 is provided with the block-side fitting hole 66. And a cover-side fitting hole 72 having a hexagonal cross section opposed thereto.

The hollow pipe 58 of the oil jet 56 is
The block fitting portion 58a and the cover fitting portion 58b each having a hexagonal cross section are formed into a block side fitting hole 66 having a hexagonal cross section of the cylinder block 4 and a cover side fitting hole 72 having a hexagonal cross section of the chain cover 46. By fitting each to
The nozzle hole 64 is positioned and supported on the cylinder block 4 so as to direct the nozzle hole 64 toward the engagement portion 54.

As described above, the lubricating device 52 of the third embodiment is described.
Is provided with a block fitting portion 58a and a cover fitting portion 58b formed in a hollow pipe 58 of an oil jet 56 in a hexagonal cross section, and a block side fitting hole 66 having a hexagonal cross section in the cylinder block 4. And a cover side fitting hole 72 having a hexagonal cross section is formed in the chain cover 46.

Therefore, the lubricating device 52 of the third embodiment is
The same effects as in the first embodiment can be obtained, and furthermore, by fitting the odd-shaped block fitting portion 58a and cover fitting portion 58b with the block-side fitting hole 66 and the cover-side fitting hole 72, Positioning can be performed without the need for a positioning member, and the positioning members 78 and 86 of the first and second embodiments can be eliminated, and the block side boss portion 82, the engagement protrusion 84, and the engagement groove portion 88 can be eliminated. The number of processing steps, the number of parts, and the weight can be further reduced as compared with the first and second embodiments.

The block fitting portion 58a and the cover fitting portion 58b are not limited to hexagonal shapes, but may be formed in an irregular shape by projecting a part of the outer peripheral surface of the hollow pipe 58 having a cylindrical cross section. The hollow pipe 58 can be formed in an irregular shape by forming a hollow part in a hexagonal cross section.

[0046]

As described above, the lubricating device for a timing chain according to the present invention does not require a pressing operation or a screwing operation as in the prior art when mounting the hollow pipe or the positioning member of the oil jet, and the fitting operation is performed. It can be easily attached by work and engagement work, and it is not necessary to use conventional mounting bolts and screw holes for screwing the mounting bolts, and to firmly assemble the hollow pipe In addition, the hollow pipe can function as a knock pin of the chain cover, and the number of knock pins can be reduced.

Therefore, the lubricating device for the timing chain can improve the assemblability of the oil jet, reduce the number of parts and the number of processing steps, and reduce the cost.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of an engine showing a first embodiment of a lubrication device.

FIG. 2 is an enlarged front view of a main part of the engine with a chain cover removed.

FIG. 3 is a front view of the engine with a chain cover removed.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is an enlarged sectional view of a main part of an engine showing a second embodiment of the lubrication device.

FIG. 6 is an enlarged front view of a main part of the engine with a chain cover removed.

FIG. 7 is an enlarged sectional view of a main part of an engine showing a third embodiment of the lubrication device.

FIG. 8 is an enlarged front view of a main part of the engine with a chain cover removed.

FIG. 9 is a front view of an engine without a chain cover showing a conventional example of a lubrication device.

FIG. 10 is a sectional view taken along line 10-10 in FIG. 9;

FIG. 11 is a sectional view taken along line 11-11 of FIG. 9;

FIG. 12 is an enlarged sectional view of a main part of the engine.

FIG. 13 is an enlarged front view of a main part of the engine with a chain cover removed.

[Explanation of symbols]

 2 Engine 4 Cylinder block 6 Cylinder head 10 Crankshaft 16 Crank sprocket 32 Timing chain 34 Cam chain 46 Chain cover 52 Lubricating device 54 Meshing portion 56 Oil jet 58 Hollow pipe 60 Oil supply passage 62 Injection oil passage 64 Nozzle hole 66 Block side Fitting hole 72 cover side fitting hole 78 positioning member 80 engagement hole 84 engagement protrusion

Claims (3)

[Claims] 1. A crankshaft is provided on a cylinder block of an engine to support the crankshaft, a camshaft is provided on a cylinder head of the engine to support the crankshaft, and is wound around a crank sprocket attached to the crankshaft. A timing chain for transmitting the rotation of the shaft to the cam shaft is provided,
A lubricating device for a timing chain, comprising: a chain cover attached to the cylinder block and the cylinder head so as to cover the timing chain; and an oil jet for injecting lubricating oil into a meshing portion between the crank sprocket and the timing chain. Wherein the oil jet comprises a hollow pipe whose longitudinal ends are respectively fitted and supported by the cylinder block and the chain cover, and the oil jet is supplied to the hollow pipe from an oil supply passage of the cylinder block. Providing a passage and providing a nozzle hole for injecting oil in the oil passage for injection toward the meshing portion,
A timing chain lubricating device, wherein a positioning member engaged with and supported by the cylinder block is provided in the hollow pipe so that the nozzle hole is directed toward the engagement portion. 2. The oil jet hollow pipe is provided with one longitudinal end fitted and supported in a block side fitting hole of the cylinder block, and the other longitudinal end is fitted in the cover side fitting hole of the chain cover. 2. The timing chain lubrication device according to claim 1, wherein the lubrication device is provided so as to be supported together. 3. The positioning member has one end fixed to the hollow pipe and an engagement hole at the other end, and an engagement projection of the cylinder block is engaged with the engagement hole. The lubricating device for a timing chain according to claim 1, wherein the lubricating device is provided in engagement with the cylinder block.