JP4374882B2 - Engine lubrication structure with balancer device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lubrication structure for an engine provided with a balancer device, and more particularly to a lubrication structure for an engine provided with a balancer device disposed in an oil pan and driven by a chain.
[0002]
[Prior art]
A balancer device that reduces engine vibration in an engine for automobiles or the like is generally built in a cylinder block and driven by a crankshaft by gear drive, but there is a problem of gear backlash in the case of gear drive. Also, if the balancer shaft is supported by the cylinder block, the difference in thermal expansion between the aluminum cylinder block and the iron gear becomes a problem. Therefore, in the gear drive system, a long leg is provided in the balancer device so as to absorb the difference in thermal expansion between the cylinder block and the gear, and the leg is connected to the cylinder block via the leg. Aside from that, a balancer in which an oil pump is integrated with a chain drive suspension type is conventionally known (see, for example, Patent Document 1). Moreover, the structure of the lubricating oil passage of the balancer has been disclosed conventionally (for example, see Patent Document 2), and a structure for performing lubrication of the front journal by piping has been conventionally disclosed (for example, see Patent Document 3).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-38030 [Patent Document 2]
Japanese Utility Model Publication No. 5-8088 [Patent Document 3]
JP 58-160644 A
[Problems to be solved by the invention]
As described above, the gear-driven balancer device has long legs connected to the cylinder block in order to absorb the thermal expansion difference. In this case, the journal of the balancer device is lubricated by forming an oil passage in the extended leg portion and communicating the oil passage to the oil passage leading to the oil gallery of the cylinder block simultaneously with the assembly of the balancer device. . On the other hand, in the case of a chain drive type balancer device, it is not necessary to extend a long leg to absorb the difference in thermal expansion, but since the leg is not extended, the balancer journal is lubricated in the same lubricating structure as in the case of a gear drive type. Can't do it. It Ru also conceivable to provide an oil passage in the skirt portion of the cylinder block, but then the width of the skirt portion is increased engine becomes wider.
[0005]
Also, in the balancer device that supports the center of the balancer weight part with the rear journal part, the load on the rear journal is heavy, so we want to supply clean oil after passing through the oil filter to the rear journal as much as possible. Since there is a restriction on the filter position due to the arrangement or the like, an oil passage that guides the oil that has passed through the filter to the rear journal may not be formed simply in the cylinder block.
[0006]
Therefore, it becomes a problem to be able to easily form an oil passage for lubricating a chain drive type balancer device.
[0007]
[Means for Solving the Problems]
The lubrication structure for an engine equipped with the balancer device according to claim 1 is a four-cylinder in-line engine in which an oil pump is disposed at the front of the engine and an oil filter is disposed at the side of the rear of the cylinder block. A balance weight part, a balancer shaft to which a sprocket is attached at the tip of an extension shaft part extending forward from the unbalance weight part, a rear journal part for supporting the center part of the unbalance weight part, and a front journal for supporting the extension shaft part balancer device and a part is disposed in the oil pan, the balancer shaft is a lubrication structure for an engine which is chain driven by the engine front, the cylinder block through the oil filter from the oil pump An oil passage leading to the oil gallery in the cylinder block is provided in the cylinder block. While formed on the partition wall oil passage extending from the oil filter of the passage to the oil gallery is formed a crank journal between cylinder row direction third cylinder and fourth cylinder of the cylinder block, the A balancer device is bolted to a balancer device mounting seat formed on a mating surface portion with an oil pan below a skirt of a cylinder block at the rear journal portion and the front journal portion, and an oil passage for lubricating the rear journal portion, The oil passage of the partition wall extending from the oil filter to the oil gallery is connected by a pipe extending upward from the balancer device mounting seat .
[0008]
In this case, the oil can be supplied to the oil passage for lubricating the rear journal part through the pipe from the oil passage for supplying oil to the oil gallery in the cylinder block, and the oil passage for lubricating the chain drive type balancer device Can be easily formed. And since it was set as the piping structure, the passage route for supplying the oil after passing a filter is easy. In addition, the balancer device is bolted to the skirt lower part of the cylinder block at the rear journal part and the front journal part, whereby the cylinder block skirt part is reinforced and the opening and closing vibration of the skirt part can be suppressed.
[0009]
In particular, in what the oil pump is disposed an oil filter to the cylinder block rear side are arranged in front of the engine, it is possible to perform routing such passage pipe can be simplified oil passage structure of a cylinder block side .
[0010]
An engine lubrication structure including a balancer device according to a second aspect of the invention includes the above-described configuration according to the first aspect of the invention, and the engine is mounted on a vehicle in such a manner that the cylinder row direction is oriented in the longitudinal direction of the vehicle body. In the longitudinal engine, an auxiliary machine driven by a crankshaft is disposed on the front side of the cylinder block, and an engine mount mounting seat is formed behind the auxiliary machine. Therefore, it is necessary to arrange the oil filter behind the engine mount mounting seat. Therefore, the configuration of the invention according to claim 1 is preferably applied to such a longitudinal engine.
[0011]
An engine lubrication structure including a balancer device according to a third aspect of the invention includes the above-described configuration according to the first or second aspect of the invention, and the oil pump is disposed on the extension shaft portion of the balancer shaft. Is. The oil pump can thus be integrated into the balancer device.
[0012]
An engine lubrication structure including a balancer device according to a fourth aspect of the present invention includes the above-described configuration according to any one of the first to third aspects, and includes two balancer shafts on which the balancer device rotates reversely. The unbalanced weight of each balancer shaft is divided into the front and rear of the rear journal, the unbalanced weights of both balancer shafts are offset in the axial direction, and both unbalanced weights are close to each other when viewed in the axial direction. And some overlap. With this configuration, the balancer device can be light and compact while avoiding interference between the unbalanced weight portions of the two balancer shafts, and can generate sufficient vibration force.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
1-6 shows an example of embodiment. 1 is a perspective view of the balancer device, FIG. 2 is an exploded view of the balancer device, FIG. 3 is a bottom view of the cylinder block, FIG. 4 is a front sectional view of the lower portion of the engine, and FIG. .
[0015]
The engine of this embodiment has a four-cylinder inline, and a balancer device 6 that is driven by being connected to a sprocket 4 at the front of the crankshaft 3 by a chain 5 inside an oil pan 2 disposed below the cylinder block 1. Have
[0016]
The balancer device 6 includes two balancer shafts 7 and 8 that rotate in reverse to each other, and each balancer shaft 7 and 8 includes a pair of unbalanced weight portions 9 that are separately arranged, and the balancer shafts 7 and 8 and a pair of unbalanced weights 9 and 8. Rear journal portions 10 and 11 for supporting the center portion of the balance weight portion 9 and front journal portions 14 and 15 for supporting extension shaft portions 12 and 13 extending forward from the unbalance weight portion 9 of the balance shafts 7 and 8. A lower housing 16 and an upper housing 17 are provided.
[0017]
The balancer device 6 is bolted to the lower part of the skirt of the cylinder block 1 at the rear journal parts 10 and 11 and the front journal parts 14 and 15. A sprocket 18 is attached to the tip of the extension shaft portion 12 of the unbalance weight portion 9 of the balance shaft 7. In addition, an oil pump 20 is separately provided on the side of the balancer device 6. The chain 5 is wound around the crank sprocket 4, the sprocket 18 of the balancer shaft 7, and the sprocket 21 of the oil pump 20.
[0018]
Thus, the oil pump 20 is separately attached to the front of the engine. An oil filter 22 is disposed on the rear side of the cylinder block 1. Oil passages 24 and 25 that pass from the oil pump 20 through the oil filter 22 to the oil gallery 23 in the cylinder block 1 are formed in the cylinder block 1, and the oil filter 22 of the oil passage 25 on the oil gallery 23 side is formed. A pipe 27 is connected to supply the oil immediately after passing to the oil passage 26 for lubricating the rear journal portions 10 and 11.
[0019]
As shown in FIG. 3, a balancer device mounting seat 31 is provided on the mating surface portion of the cylinder block 1 and the oil pan, and screw holes 32, 33, 34, 35 for bolt fastening are formed. An oil passage 25 extending from the oil filter 22 to the oil gallery 23 is a partition that forms a crank journal between the third cylinder (# 3) and the fourth cylinder (# 4) in the cylinder row direction of the cylinder block 1. 36, and the tip of the pipe 27 extending upward from the balancer device mounting seat 31 of the cylinder block 1 is connected to the oil passage 25 of the partition wall portion 36, and the flange 38 at the tip of the pipe 27 is bolted to the screw hole 37. Is done.
[0020]
An engine mount mounting seat 40 is formed at a position behind the oil pump 20 on the front side of the cylinder block 1. In FIG. 3, although not shown on the opposite side of the cylinder block, an engine mount mounting seat is formed.
[0021]
6 and 7 show another example of a balancer device according to an embodiment of the present invention. The balancer device 50 includes two balancer shafts 52 and 53 that rotate in reverse from each other on a frame 51 having a skeleton structure, and the unbalanced weight portions 54 and 55 of the balancer shafts 52 and 53 respectively correspond to the rear journal portions 56 and 57. A structure in which the unbalanced weights 54 and 55 of the balancer shafts 52 and 53 are offset in the axial direction, and the unbalanced weights 54 and 55 are close to each other and partially overlap each other when viewed in the axial direction. It is said that.
[0022]
8 to 10 show a balancer device of still another example of the embodiment of the present invention. In the balancer device 60, an oil pump 70 is disposed on an extension shaft portion of the balancer shafts 62 and 63, and the balancer device 60 and the oil pump 60 are integrated into a unit. The balancer device 60 includes two balancer shafts 62 and 63 that rotate in reverse to each other on a frame 61 having a skeleton structure. The unbalanced weight portions 64 and 65 of the balancer shafts 62 and 63 are offset in the axial direction, and the unbalanced weight portions 64 and 65 are close to each other and partially overlap when viewed in the axial direction. It is a thing. Further, each of the unbalanced weight portions 64 and 65 has a shape in which the outer periphery is cut obliquely so as not to stir the oil in the oil pan as much as possible.
[0023]
【The invention's effect】
As is apparent from the above description, according to the lubricating structure of the present invention, an oil passage for lubricating a chain drive type balancer device can be easily formed. There is no need to provide a road. Further, the cylinder block skirt portion can be reinforced by the balancer device, and the oil after passing through the filter can be supplied to the rear journal while suppressing the opening and closing vibration of the skirt portion.
[Brief description of the drawings]
FIG. 1 is a perspective view of an example of a balancer device according to an embodiment of the present invention.
FIG. 2 is an exploded view of the balancer device of FIG.
FIG. 3 is a bottom view of the cylinder block in the example of FIG.
FIG. 4 is a front sectional view of the lower part of the engine in the example of FIG. 1;
FIG. 5 is a cross-sectional side view of the lower part of the engine of the example of FIG.
FIG. 6 is a plan view of another example of a balancer device according to an embodiment of the present invention.
7 is a rear view of the balancer device of FIG. 6;
FIG. 8 is a plan view of a balancer device of still another example of the embodiment of the present invention.
9 is a sectional view in the axial direction of the balancer device of FIG. 8;
FIG. 10 is a side view of the balancer device of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Oil pan 3 Crankshaft 4 Sprocket 5 Chain 6, 50 Balancer device 7, 8, 52, 53, 62, 63 Balancer shaft 9, 54, 55, 64, 65 Unbalanced weight part 10, 11, 56, 57, 66, 67 Rear journal portion 12, 13 Extension shaft portion 14, 15 Front journal portion 18 Sprocket 20, 70 Oil pump 21 Sprocket 22 Oil filter 23 Oil gallery 24, 25, 26 Oil passage 27 Pipe 31 Balancer device mounting seat 36 Bulkhead 40 Engine mount mounting seat

Claims (4)

In a four-cylinder series engine in which an oil pump is disposed at the front of the engine and an oil filter is disposed at the side of the rear of the cylinder block, the front end of the unbalanced weight part and the extension shaft that extends forward from the unbalanced weight part balancer device provided with a front journal portion for supporting the extension shaft portion and the rear journal portion sprocket and the balancer shaft which is mounted for supporting a central portion of the unbalanced weight portion is disposed in the oil pan, the balancer An engine lubrication structure in which the shaft is chain-driven at the front of the engine,
An oil passage from the oil pump through the oil filter to the oil gallery in the cylinder block is provided in the cylinder block, and an oil passage in the oil passage from the oil filter to the oil gallery is the cylinder block. While formed in the partition wall portion forming the crank journal between the third cylinder and the fourth cylinder in the cylinder row direction of the block,
The balancer device is bolted to a balancer device mounting seat formed on the mating surface portion with the oil pan at the lower part of the skirt of the cylinder block at the rear journal portion and the front journal portion,
The oil passage for lubricating the rear journal portion and the oil passage of the partition portion extending from the oil filter to the oil gallery are connected by a pipe extending upward from the balancer device mounting seat. An engine lubrication structure equipped with a balancer device. The engine is a vertical engine mounted on a vehicle with the cylinder row direction oriented in the longitudinal direction of the vehicle body. The cylinder block is provided with an auxiliary machine driven by a crankshaft on the front side and behind the cylinder block. 2. An engine lubrication structure comprising the balancer device according to claim 1, wherein an engine mount mounting seat is formed. The engine lubrication structure provided with the balancer device according to claim 1 , wherein the oil pump is disposed on the extension shaft portion of the balancer shaft. The balancer device is provided with two balancer shafts that rotate reversely to each other, and the unbalanced weight portions of the balancer shafts are separately arranged in front and rear of the rear journal portion, and the unbalanced weight portions of both balancer shafts are offset in the axial direction An engine lubrication structure comprising the balancer device according to any one of claims 1 to 3 , wherein both unbalanced weight portions are close to each other and partially overlap when viewed in the axial direction.

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