JP6530939B2 - Bearing metal for engine - Google Patents

Description

  The present invention relates to a bearing metal such as a journal metal, a crank pin metal, a side metal, and a balancer metal, and more particularly to an engine bearing metal having a resin film on a sliding surface with a rotating body.

  Conventionally, as a bearing metal for industrial diesel engines, there is one having a resin film on the surface of a sliding portion. According to this kind of bearing metal, the resin film optimizes the clearance of the sliding portion, and the advantage is obtained that the sliding friction is reduced while securing the hydraulic pressure. As such prior art, what is disclosed in Patent Document 1 is known.

  However, it is difficult to hold the oil film, probably because the film on the sliding portion is uniform all over, and the sliding friction reducing function is insufficient.

JP, 2014-234739, A

  Therefore, as shown in FIG. 9, it has been tried to maintain the oil film by arranging a plurality of recesses 103 in a spot shape on a series of resin films 102 to function as an oil reservoir. However, since the concave portion 103 is surrounded by the resin film 102, it is difficult to supply the engine oil to the concave portion 103, and a sufficient amount of engine oil is not held in the concave portion 103. The friction reduction function was insufficient.

  Therefore, as a result of intensive research, as shown in FIG. 1 to FIG. 3, a plurality of resin films 14 are disposed in a spot shape on the sliding surface 13, and a recess 15 is formed between the resin films 14 and 14. The formation of the reticulated groove 16 improves the supply of the engine oil to the reticulated groove 16, that is, the recess 15, and a sufficient amount of engine oil is retained in the recess 15. The friction of the sliding surface 13 by the engine oil It has been found that the reduction function is enhanced.

  Moreover, as a result of earnest research, as shown in FIG. 5, the resin film 14 of vertical stripes extending in the sliding direction s is disposed on the sliding surface 13 and a recess formed between the adjacent resin films 14 and 14 There is also a means for forming longitudinal stripes 19 of longitudinal stripes extending in the sliding direction s15. That is, when the sliding direction both end portions 19 a and 19 b of the vertical stripe groove 19 are closed by the resin film 14 near the sliding direction both edge 13 a and 13 b of the sliding surface 13, engine oil to the vertical stripe groove 19, that is, the recess 15 is It has been found that the supply of the above is improved, a sufficient amount of engine oil is held in the recess 15, and the friction reducing function of the sliding surface 13 by the engine oil is enhanced.

  In view of the above-mentioned situation, an object of the present invention is to provide a bearing metal for an engine capable of improving the supply of engine oil to the recess.

The invention according to claim 1 is an engine bearing metal having a resin film 14 on the sliding surface 13 with the rotating body r,
A plurality of resin films 14 are disposed in a spot shape on the sliding surface 13, and a mesh-like groove 16 is formed by the concave portions 15 formed by the resin film 14 and the sliding surface 13 adjacent between the resin films 14. , And the mesh-like groove 16 is provided with a longitudinal groove portion extending in the sliding direction s of the sliding surface 13 .

The invention according to claim 2 is the bearing metal for an engine according to claim 1,
A plurality of resin films 14 are arranged at predetermined intervals in a direction k intersecting the sliding direction s of the sliding surface 13 with a resin film row 17, and the resin film row 17 is a sliding surface of the sliding surface 13. The sliding openings 18a and 18b at both ends in the sliding direction s of the groove portions 18 which are arranged in a plurality of rows in the moving direction s and are formed between the adjacent resin films 14 and 14 of the resin film row 17 It is characterized in that it is directed to the resin film 14 of the resin film row 17 adjacent in the direction s.

The invention according to claim 3 is the bearing metal for an engine according to claim 1,
A plurality of resin films 14 are arranged at predetermined intervals in a direction k intersecting the sliding direction s of the sliding surface 13 and a plurality of resin films 17 are arranged in the sliding direction s. Arranged in columns,
The resin film 14 of the plurality of resin film rows 17 is arranged in alignment with the sliding direction s, whereby the mesh-like groove 16 extends in series along the sliding direction s with the longitudinal groove portion 30 , And a transverse groove portion 31 extending in series along the intersecting direction,
An oil storage groove portion 32 wider than the other portions of the mesh groove 16 is formed at the intersection between the vertical groove portion 30 and the horizontal groove portion 31.

The invention according to claim 4 is the bearing metal for an engine according to any one of claims 1 to 3,
An auxiliary oil storage groove 33 is recessed in the resin film 14.

The invention according to claim 5 is an engine bearing metal having a resin film 14 and a recess 15 on the sliding surface 13 with the rotating body r,
A vertically-striped resin film 14 extending in the sliding direction s of the sliding surface 13 is disposed, and is formed between the resin films 14 and 14 adjacent to each other and the sliding surface 13. that said at recess 15 longitudinal stripe grooves 19 of vertical stripes extending in the sliding direction s is formed, the end portions 19a of the sliding direction s, 19b are both end edge portions 13a of the front Kisurido direction s of the longitudinal stripe grooves 19, 13b It is characterized in that it is closed by the resin film 14 close to it.

According to the first aspect of the present invention, the effect of improving the supply of engine oil to the recess is achieved.
As shown in FIGS. 1 to 4, a plurality of resin films 14 are disposed in a spot shape on the sliding surface 13 of the bearing metal 4, and a reticulated groove is formed in the recess 15 formed between the resin films 14 and 14. Since 16 is formed, engine oil is supplied from the openings 16a and 16b at both ends in the sliding direction s of the mesh groove 16 in the mesh groove 16, that is, into the recess 15, when the rotating body r rotates. Supply of engine oil to the engine is improved.
Therefore, a sufficient amount of engine oil is held in the recess 15, and the function of reducing the friction of the sliding surface 13 of the bearing metal 4 by the engine oil is enhanced.

According to the first aspect of the present invention, the engine oil retaining area can be formed over a wide area of the sliding surface 13.
As shown in FIGS. 1 and 2, a plurality of resin films 14 are disposed in a spot shape on the sliding surface 13 of the bearing metal 4 and a mesh-like groove is formed in the recess 15 formed between the resin films 14 and 14. Since 16 is formed, a holding area of engine oil can be formed over a wide area of the sliding surface 13.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the engine oil holding function of the mesh groove can be enhanced.
As shown in FIG. 2, both end openings 18a and 18b in the sliding direction s of the groove portion 18 formed between adjacent resin films 14 and 14 of the same resin film row 17 are in the sliding direction s. Because it is directed to the resin film 14 of the adjacent resin film row 17, the engine oil flowing out from the both end openings 18 a and 18 b of the groove portion 18 by the rotation of the rotating body r is the resin film of the next resin film row 17 As a result, the engine oil can be prevented from flowing out of the groove portion 18 and the engine oil holding function of the mesh groove 16 can be enhanced.

According to the third aspect of the invention, in addition to the effect of the first aspect of the invention, the engine oil holding function of the mesh groove can be enhanced.
As shown in FIG. 4, since the oil reservoir groove portion 32 wider than the other portions of the mesh groove 16 is formed at the intersection between the longitudinal groove portion 30 and the lateral groove portion 31, the oil reservoir groove portion 32 is formed. A large amount of engine oil can be retained, and the engine oil retaining function of the mesh groove 16 can be enhanced.

According to the invention of claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, the effect that the engine oil holding function on the sliding surface of the bearing metal can be enhanced is exhibited.
As shown in FIG. 4, since the auxiliary oil storage groove 33 is recessed in the resin film 14, engine oil is also accumulated in the auxiliary oil storage groove 33, and the engine oil retention function on the sliding surface 13 is enhanced. be able to.

According to the invention of claim 5, the following effects are achieved.
As shown in FIG. 5, since both end portions 19a and 19b in the sliding direction s of the vertical stripe groove 19 are closed by the resin films 14 near the both end edges 13a and 13b in the sliding direction s of the bearing metal 4, Engine oil is supplied to the inside of the longitudinal stripe groove 19, that is, the concave portion 15 by simply crossing over the resin film 14 of both end edges 13 a and 13 b in the sliding direction s of the longitudinal stripe groove 19 when the rotating body r rotates. Engine oil supply is improved. Therefore, a sufficient amount of engine oil is held in the recess 15, and the function of reducing friction of the sliding surface 13 by the engine oil is enhanced.

According to the fifth aspect of the present invention, the engine oil retaining area can be formed over a wide area of the sliding surface of the bearing metal.
As shown in FIG. 5, since both end portions 19a and 19b in the sliding direction s of the vertical stripe groove 19 are closed by the resin films 14 near the both end edges 13a and 13b in the sliding direction s of the bearing metal 4, An engine oil holding area can be formed over a wide area of the sliding surface 13.

The perspective view which shows the sliding face structure of radial metal (Embodiment 1) Top view showing resin coating of radial metal and its enlarged view Perspective view showing the sliding surface structure of thrust metal An enlarged view showing a resin film and a reticulated groove according to Embodiment 2 An enlarged view showing a resin film and a reticulated groove according to Embodiment 3. Longitudinal sectional view showing a bearing case of an engine and its peripheral portion An exploded perspective view for explaining the mounting state of the engine bearing case Longitudinal side view of the engine A perspective view of a bearing metal according to the prior art

  Hereinafter, an embodiment of a bearing metal for an engine according to the present invention will be described with reference to the drawings when applied to a diesel engine mounted on an agricultural tractor or the like.

  I will briefly explain the engine. As shown in FIG. 8, the cylinder head 21 is assembled on the top of the cylinder block 20, and the head cover 22 is assembled on the top of the cylinder head 21. An oil pan 23 is assembled to the lower portion of the cylinder block 20. A gear case 24 is attached to the front of the cylinder block 20. The lower portion of the cylinder block 20 accommodates the crankshaft 1.

  With the intermediate bearing case 26 assembled to the intermediate journal 25 of the crankshaft 1 and the end bearing case 3 assembled to the end journal 2, the end bearing hole of the rear cylinder block end wall 5 6 is a tunnel type bearing structure in which the crankshaft 1 is inserted into the cylinder block 20, the bearing case 26 is fitted in the middle bearing hole 27, and the end bearing case 3 is fitted in the end bearing hole 6. It is adopted. A flywheel 29 is attached to the rear end of the crankshaft 1.

  The bearing structure of the end will be briefly described. As shown in FIG. 6, a bearing case 3 supporting a bearing (bearing metal) 4 is externally fitted to the end journal 2 of the crankshaft 1, and the bearing 4 is attached to the bearing case 3. The bearing case 3 is internally fitted in the end bearing hole 6 of the cylinder block end wall 5, and the bearing case 3 is covered with the bearing case cover 8 from the outside via the case gasket 7. The bearing case cover 8 is the cylinder block end wall 5 Is attached to the cover with a cover mounting bolt 9.

  The crankshaft 1 is penetrated through a crankshaft through hole 8 a of the bearing case cover 8, and an oil seal 8 b is fitted into the crankshaft through hole 8 a, and the oil seal 8 b is in pressure contact with the circumferential surface of the crankshaft 1. The bearing 4 is composed of a radial metal 4a and a thrust metal 4b. The bearing case 3 has an upper and lower split structure, and is assembled to the end journal portion 2 from above and below. A case cover gasket 28 may be held between the bearing case cover 8 (see FIG. 7) and the cylinder block end wall 5.

  As shown in FIG. 7, a plurality of bolt through holes 10 are provided in the bearing case cover 8 at predetermined intervals in the circumferential direction. As shown in FIG. 6, screw holes 11 are provided on the outer peripheral edge portion of the bearing case 3 while maintaining a predetermined interval in the circumferential direction. As shown in FIG. 6, the case mounting bolt 12 is penetrated from the outside of the bearing case cover 8 through the bolt through hole 10 of the bearing case cover 8 and the bolt through hole 34 of the case gasket 7. The screw holes 11 are screwed to each other. Accordingly, the bearing case 3 is fixed to the cylinder block end wall 5, and the case gasket 7 is held between the bearing case cover 8 and the bearing case 3. The case gasket 7 is a thin sheet of copper.

Embodiment 1
Next, a bearing metal for an engine will be described.
As shown in FIGS. 1 and 2, a radial metal 4a ("engine" having a resin film 14 on the sliding surface (inner peripheral surface) 13 with the end journal portion 2 of the crankshaft 1 (an example of the rotating body r) In one example of the bearing metal 4 ′ ′, a plurality of resin films 14 are disposed in a spot shape on the sliding surface 13 and the mesh grooves 16 are formed by the concave portions 15 formed between the adjacent resin films 14 and 14 It is done.

As shown in FIGS. 1 and 2, the resin film 14 and the recess 15 are uniformly formed on the inner peripheral surface of the radial metal 4 a, that is, the sliding surface 13. For the resin film 14, a resin such as a polyamide resin, an epoxy resin, a phenol resin, a silicone resin, or a polyimide resin is used. The resin film 14 contains an inorganic solid lubricant such as a transition metal oxide or graphite.
The resin film 14 is formed, for example, in the shape of a regular hexagon, so that the mesh grooves 16 are formed in the shape of a hexagonal mesh. Reticulated groove 16 is formed between adjacent resin films 14, 14, and the inner bottom surface of reticulated groove 16 is formed of the metal surface of radial metal 4 a not covered with resin film 14. .

As shown in FIG. 2, a resin film in which a plurality of resin films 14 are disposed at a predetermined interval in the circumferential direction of the sliding surface 13, that is, in a direction (an example of a crossing direction) k orthogonal to the sliding direction s. A row 17 is provided, and a plurality of resin film rows 17 are arranged in the sliding direction s.
Both end openings 18a and 18b in the sliding direction s of the groove portion 18 formed between the resin films 14 and 14 adjacent to each other in the resin film row 17 are adjacent to the resin film row 17 adjacent in the sliding direction s. Is directed to the resin film 14 of FIG.

Second Embodiment
As shown in FIG. 4, a resin film in which a plurality of resin films 14 are disposed at a predetermined interval in a direction (an example of a crossing direction) k orthogonal to the sliding direction s of the sliding surface 13 of the radial metal 4 a. A row 17 is provided, and a plurality of resin film rows 17 are arranged in the sliding direction s.
By arranging the resin films 14 and 14 of the resin film rows 17 and 17 in a plurality of rows in alignment with the sliding direction s, the mesh-like groove 16 extends in series along the sliding direction s , And a transverse groove portion 31 extending in series along the orthogonal direction k.

An oil reservoir groove portion 32 wider than the other portions of the mesh groove 16 is formed at the intersection between the longitudinal groove portion 30 and the lateral groove portion 31.
The lower portion of the resin film 14 of the predetermined resin film row 17 is tapered at the end of the oil reservoir groove portion 32, and the resin film row 17 adjacent to the resin film row 17 in one direction of the sliding direction s The other direction end of the resin film 14 is formed to be a substantially square recess by being tapered.

  In the second embodiment, the auxiliary oil storage groove 33 is recessed in the resin film 14. The auxiliary oil storage groove 33 formed in a concave shape of “2” or “5” is formed in the area of each resin film 14 arranged in a spot shape, and the inner bottom surface is covered with the resin film 14 There is no metal surface of the radial metal 4a. The other configuration is the same as that of the first embodiment. In FIG. 4, the same elements as those of the first embodiment are denoted by the same reference numerals as those of FIGS. 1 and 2.

Third Embodiment
As shown in FIG. 3, sliding on the thrust metal 4 b (an example of the “bearing metal 4 for engine”) having the resin film 14 on the sliding surface (side surface) 13 with the end journal 2 of the crankshaft 1 A plurality of resin films 14 are disposed in a spot shape on the surface 13, and the mesh-like grooves 16 are formed by the concave portions 15 formed between the adjacent resin films 14 and 14.

In the thrust metal 4b, a plurality of or a single resin film 14 is provided at a predetermined interval in a radial direction (an example of a crossing direction) k with respect to the rotational axis P of the crankshaft 1 which is a direction orthogonal to the sliding direction s. The resin film row 17 disposed is disposed, and the resin film row 17 is radially disposed in a plurality of rows in the sliding direction s.
Openings 18a and 18a at both ends in the sliding direction s of the groove portion 18 formed between the resin films 14 and 14 adjacent to each other in the resin film row 17 are adjacent to the resin film row 17 adjacent in the sliding direction s. Is directed to the resin film 14 of FIG.

Embodiment 4
As shown in FIG. 5, the engine bearing metal 4 may be provided with a resin film 14 and a recess 15 on the sliding surface 13 of the radial metal 4a. A vertically-striped resin film 14 extending in the sliding direction s is disposed on the sliding surface 13, and a vertically-striped vertically-striped groove 19 extending in the sliding direction s is formed by the recess 15 formed between the adjacent resin films 14 and 14. The two end portions 19 a and 19 b in the sliding direction s of the vertical stripe groove 19 are closed by the resin film 14 near the both end edges 13 a and 13 b in the sliding direction s of the sliding surface 13. In addition, since the other end 19 b is not visible in FIG. 5, the reference numeral 19 b is given in parentheses beside the one end 19 a.

The resin film 14 has a shape in which the inside of a rectangular frame is divided by a plurality of vertical bars, and the vertical stripe groove 19 is formed between the vertical bars of the resin film 14 and the inner bottom is a radial metal not covered by the resin film 14 It is formed of the metal surface of 4a.
The other configuration is the same as that of the first embodiment, and in FIG. 5, the same elements as those of the first embodiment are denoted by the same reference numerals as those of FIGS.

Reference Signs List 13 sliding surface 13a, 13b edge 14 resin film 15 recess 16 mesh groove 17 resin film row 18 groove portion 18a, 18b opening 19 vertical stripe groove 19a, 19b end 30 longitudinal groove portion 31 lateral groove portion 32 oil storage groove Part 33 Auxiliary oil reservoir groove k Direction to intersect sliding direction r Rotor s Sliding direction

Claims (5)

An engine bearing metal having a resin film on the sliding surface with the rotating body,
A plurality of resin films are disposed in a spot shape on the sliding surface, and a reticulated groove is formed by a recess formed by the resin film and the sliding surface adjacent to each other between the resin films, and the mesh shape groove is has a bearing for an engine metal which comprises a longitudinal groove portion extending Suridokata direction of the sliding surface.
  A plurality of resin films are arranged at predetermined intervals in a direction intersecting the sliding direction of the sliding surface, and a plurality of resin films are arranged in the sliding direction of the sliding surface. The opening in the sliding direction of the groove portion formed between adjacent resin films of the resin film sequence is directed to the resin film of the adjacent resin film sequence adjacent in the sliding direction. A bearing metal for an engine according to claim 1. A plurality of resin films are arranged at predetermined intervals in a direction intersecting the sliding direction of the sliding surface, and a plurality of resin films are arranged in the sliding direction.
By arranging resin films of a plurality of resin film rows in alignment in the sliding direction, the mesh grooves extend in the intersecting direction with the longitudinal groove portions extending in series along the sliding direction. And a series of transverse grooves extending along the
The bearing metal for an engine according to claim 1, wherein an oil storage groove portion wider than the other portions of the mesh-like groove is formed at an intersection of the longitudinal groove portion and the lateral groove portion.   The bearing metal for engines according to any one of claims 1 to 3, wherein an auxiliary oil storage groove is recessed in the resin film. An engine bearing metal having a resin film and a recess on a sliding surface with a rotating body,
A resin film of longitudinal stripes extending in the sliding direction of the sliding surface is disposed, and a longitudinal stripe extending in the sliding direction in the recess formed by the resin films and the sliding surface between the adjacent resin films of vertical stripes groove is formed, the longitudinal stripe groove the sliding direction of both ends before Kisurido opposite end edge side of the engine bearing metal closed with a resin film of.

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