JPH04114116U - Half type flange bearing - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a half-split flange bearing with excellent seizure resistance on the flange. [Structure] It is interposed between the main housing 6 and the sub-housing 7, which are connected together by tightening bolts 8, and supports the crankshaft 5 rotatably by the semi-cylindrical body 1. Flange portions 2a and 2b are connected to both ends of the portion 1 in the central axis direction via circumferential notches 3d, respectively.
However, the opposing annular side surfaces 5b and 5c of the crankshaft 5
A pair of half-split flange bearings 4, 4 that are in close contact with each other,
Bearing surfaces 3b and 3c of the flanges 2a and 2b form convex curved surfaces that smoothly connect to the notch 3d and extend in the radial direction. [Effect] The bearing surface of each flange comes into strong local contact with the annular side surface of the housing, thereby preventing breakage of the oil film and surface fatigue of the bearing alloy layer on the bearing surface. As a result, the bearing alloy layer is peeled off and seizing is prevented, so that the bearing performance and the durability of the bearing as a whole are improved.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a half-split type flange bearing.

0002

[Prior art and its problems]

Conventionally, the crankshaft of an internal combustion engine was rotatably supported on a cylinder block. As a bearing, a half-split type flange bearing is known. This type of half-split flange bearing is It is interposed between the housing and the sub-housing, and the crankshaft is connected to a semi-cylindrical body. The crankshaft is rotatably supported by the The collars of each are in close contact with each other. The bearing surface of the flange that comes into contact with this crankshaft The cross-sectional shape in the radial direction was a straight line.

0003 This type of half-split type flange bearing has a circumferential length that is in the circumferential direction of the inner circumference of the housing. Set it slightly longer than the length, give a tightening allowance, and tighten the bolt to the main housing. When tightening the secondary housing with the specified tightening force, this difference (tightening margin) is eliminated. Then, attach the half-shaped flange bearing to the housing by crimping it. However, in the case of such conventional half-split type flange bearings, the housing does not meet the specified specifications. When a tightening force is applied, each half-shaped flanged bearing undergoes diameter reduction deformation, and as a result, both flanges are deformed. Causes leaning.

0004 FIG. 7 shows an exaggerated state of inclination of both flanges. In the same figure, 30 is a half-split type flange. A bearing is shown, 30a is a body part, and 30b and 30c are collar parts, respectively. Same figure As is known from the above, when the flanges 30b and 30c are bent inward, the flanges The inner peripheral corners of 30b and 30c are attached to the annular side surfaces 31a and 31b of the housing, respectively. It hit locally strongly, causing surface fatigue to the bearing alloy coated on the flange parts 30b and 30c. Ru. In some serious cases, the bearing alloy may peel off, resulting in seizure. this Such a seizure phenomenon of the flanges 30b and 30c is caused by the moisture supplied to the inner circumferential surface of the body 30a. The inner periphery of the flanges 30b, 30c where the lubricating oil locally contacts the annular side surfaces 31a, 31b. The lubricating oil is not widely supplied to the flanges 30b and 30c because the lubricating oil is blocked by the corners of the lubricant. It is encouraged by this.

[0005]

[Means to solve the problem]

The present invention was devised in view of such conventional technical problems, and its structure is The main housing and the sub housing are connected together by bolts. The crankshaft is rotatably supported by the semi-cylindrical body, and , a collar connected to both ends of the body in the direction of the central axis through circumferential notches. A pair of half-split flanged shafts whose portions are in contact with opposing annular side surfaces of the crankshaft. A bearing in which the bearing surface of the flange smoothly connects to the notch and extends in the radial direction. This is a half-split type flange bearing with a convex curved surface.

[0006]

[Effect]

When assembling a pair of half-split flanged bearings into a housing, the half-split flanged shaft The circumferential length of the outer periphery of the receiver is the inner length of the main housing and the sub housing. It is set slightly longer than the circumferential length of the circumference, which allows for the same tightening as the conventional example. allowance is given. Then, attach the sub housing to the main housing with bolts. When tightened to the specified tightening force, the half-flange bearing will tighten by the amount of tightening allowance. Under compression in the radial direction, each half-flange bearing is crimped to the housing, and at the same time the half-flange bearing is compressed. The diameter of split flanged bearings is reduced. Along with the diameter reduction deformation of this half-split type flange bearing, , each collar part is tilted.

[0007] However, the bearing surface of each flange smoothly connects to the body through the notch. It has a convex curved surface. Therefore, the inclination changes based on the tightening pressure of the bolt. Each shaped flange is in contact with the annular side surface of the crankshaft through a convex curved surface. It receives thrust force and avoids strong local impact from the corners. Such good An unfavorable yaw contact state is achieved by the convex curved surface corresponding to the angle of inclination of each flange. It will be done. Therefore, the lubricating oil supplied to the bearing surface of the body for oil lubrication is It flows out from the surface and easily passes through the circumferential notch and the bearing surface of the flange. The bearing surface is well lubricated with oil.

[0008] By using bearings, each collar gradually returns to its upright state, reducing the tilt angle associated with assembly. Although it gradually decreases, the bearing surface of each flange is a convex curved surface that is good for restoring deformation of each flange. Correspondingly, the corners of each bearing surface are prevented from coming into contact with the annular side surface. the result , the bearing surface of each flange is locally strengthened by a corner on each annular side of the crankshaft. This effectively prevents localized fatigue on the bearing surface over a long period of time due to comb contact. will be stopped.

[0009] By the way, the annular side surface of the crankshaft is formed by cutting, and the annular side surface of the crankshaft is formed by cutting. As the cutting process progresses, the cutting tool gradually wears out, so the inner part is generally more sensitive than the outer part. The spacing is smaller on the periphery. On the annular side of a crankshaft like this The bearing surface of the flange is a convex curved surface so that the flange can be seen from this surface. Local contact between the bearing surface and the annular side surface is avoided.

0010

【Example】

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show one embodiment of the present invention. In Figures 3 and 4, code 1 indicates a semicircle It shows a cylindrical body, with both ends of the body 1 in the central axis direction facing outward in the radial direction. The collar portions 2a and 2b are integrally formed by bending. The inner peripheral surface of this body 1 and Bearing alloys are fixed to the outer surfaces of the flanges 2a and 2b, respectively, to form bearing surfaces 3a and 3b. , 3c.

[0011] The bearing surfaces 3b, 3c of the flanges 2a, 2b are rotated as shown in detail in FIG. Circumferential notch 3 formed for the purpose of preventing interference with the corner of the rank shaft 5 convex curved surfaces connected to the body 1 via d and extending in the radial direction; It has a convex arc surface. The bearing surfaces 3b, 3c of such flanges 2a, 2b are , is formed by cutting the back metal or bearing alloy, and is connected smoothly to the notch 3d. Ru. Therefore, the normal state in which both the flanges 2a and 2b are bent at right angles to the body 1 The intermediate portion A of the bearing surfaces 3b and 3c on the outside in the radial direction is the thickest. . Note that FIG. 5 is exaggerated, and in reality, the difference in wall thickness between the flanges 2a and 2b is 20 to 20. It is about 70 μm.

0012 The half-split type flanged bearing 4 having such a structure is used in the crankshaft of an internal combustion engine as shown in FIGS. 1 and 2. It is equipped as a main bearing that rotatably supports the link shaft 5. In other words, the main The cylinder block 6 is a housing and the bearing cap 7 is a sub housing. A pair of halves are attached to a housing 9 which is connected by tightening with a plurality of bolts 8. The flanged bearings 4, 4 are butted and interposed, and the journal 5a of the crankshaft 5 is Rotatably supported. Therefore, the bearing surface 3a of the body 1 is located outside the journal 5a. The bearing surfaces 3b and 3c of the respective flanges 2a and 2b are in contact with the circumferential surface and receive radial force. , thrust force is applied to the opposing annular side surfaces 5b and 5c of the crankshaft 5. receive. Note that the body 1 of the half-split type flange bearing 4 is provided with radial oil holes 4a and Circumferential oil grooves (not shown) are formed, and the bearing surfaces 3b of the flanges 2a, 2b, 3c, a substantially radial oil groove 4b is formed in the cylinder bush as shown in FIGS. 3 and 4. Lubricating oil forcibly supplied through the oil hole 6a and circumferential groove 6b of the lock 6 is applied to the oil hole 4. A is supplied to the bearing surface 3a of the body 1 and lubricates the space between it and the journal 5a. The lubricating oil flowing out from the bearing surface 3a of the body portion 1 is applied to the collar portions 2a, 2b and the annular side surface 5b. 5c, and oil lubricates the bearing surfaces 3b, 3c of the flanges 2a, 2b. In addition, Each half-shaped flanged bearing 4 has relief parts formed at both ends in the circumferential direction, as in the conventional example. It is.

[0013] When assembling into such a housing 9, the outer periphery of the half-split type flanged bearings 4, 4 must be The direction length is set to be slightly longer than the circumferential length of the inner circumference of the housing 9. Since the same interference as in the conventional example is given by Tighten the ring cap 7 with the bolt 8 with the specified tightening force. Then, the half-shaped flanged bearings 4, 4 are compressed in the vertical direction as shown in FIG. 2 by the amount of interference. , each of the half-shaped flanged bearings 4, 4 is crimped to the housing 9, and at the same time, the half-shaped flanged shaft The diameter of the receivers 4, 4 is reduced. Along with the diameter reduction deformation of these half-split type flanged bearings 4, 4, As a result, the respective flanges 2a and 2b are tilted as shown in FIG.

[0014] However, the bearing surfaces 3b and 3c of the respective flanges 2a and 2b are connected to the body 1 through a notch 3d. They form convex curved surfaces that connect smoothly. Therefore, the bolt 8 The respective flanges 2a and 2b, which are tilted and deformed based on the tightening pressure, are attached to the crankshaft 5. The convex curved surfaces are in contact with the annular side surfaces 5b and 5c to receive thrust force, and the corner portion This avoids strong local hits caused by Such a good welding condition means that each A convex curved surface can be obtained regardless of the angle of inclination of the flanges 2a, 2b. Also , the local contact with the corner of the crankshaft 5 is the same as in the conventional example due to the notch 3d. This will be prevented in a similar way. Therefore, the oil is forcibly supplied through the oil hole 6a and the circumferential groove 6b of the cylinder block 6. The lubricating oil is supplied from each oil hole 4a to the bearing surface 3a of the body 1 for oil lubrication. After that, it flows out from the bearing surface 3a of the body 1, and not only the oil grooves 4b of the flanges 2a and 2b but also , easily passing through the circumferential notch 3d and bearing surfaces 3b, 3c of the flanges 2a, 2b. Lubricate well with oil.

[0015] By using the bearings, the flanges 2a and 2b gradually return to their upright state as they are assembled. Although the inclination angle gradually decreases, the bearing surfaces 3b of the respective flanges 2a and 2b, which form convex curved surfaces, 3c, the respective bearing surfaces 3b, 3 correspond well to the restoring deformation of the respective flanges 2a, 2b. Avoid contact with the annular side surfaces 5b and 5c by the corners of c. As a result, each collar The bearing surfaces 3b, 3c of the crankshaft 5 are connected to the respective annular side surfaces 5b, 5c of the crankshaft 5. The corners of the bearing surfaces 3b and 3c are in strong contact with each other locally, causing local fatigue to the bearing surfaces 3b and 3c. This can be effectively prevented over a long period of time.

[0016] By the way, the annular side surfaces 5b and 5c of the crankshaft 5 are used for cutting tools such as cutting tools. It is formed by cutting using a Due to tool wear, the spacing is generally smaller on the inner periphery than on the outer periphery. . The flange is designed to fit the annular side surfaces 5b and 5c of the crankshaft 5. Since the bearing surfaces 3b and 3c of 2a and 2b are convex curved surfaces, the bearings can also be seen from these surfaces. Local contact between the surfaces 3b, 3c and the annular side surfaces 5b, 5c is avoided. As described above, the half-split type flanged bearing 4 rotatably supports the crankshaft 5 of an internal combustion engine. Although an example has been described in which this half-shaped flange bearing 4 is applied to a main bearing, it is possible to Applicable to the large end of the bearing rod to rotatably support the crankshaft 5. Both are possible.

[0017]

[Effect of the idea]

As understood from the above explanation, according to the half-split type flange bearing according to the present invention, , the inner peripheral corner of the bearing surface of each collar is locally strongly connected to the opposing annular side surface of the housing. The effect is to cause breakage of the oil film and surface fatigue of the bearing alloy on the bearing surface. is prevented. As a result, the bearing alloy peels off, causing problems such as seizure. As a result, the bearing performance and the durability of the bearing as a whole are significantly improved. effect can be obtained.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view showing an assembled state of a half-split flange bearing according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the assembled state of the half-split type flange bearing.

FIG. 3 is a front view showing the same half-split type flange bearing.

FIG. 4 is a bottom view showing the same half-split type flange bearing.

FIG. 5 is a diagram showing the main parts of the same half-split type flange bearing.

[FIG. 6] Similarly, an action explanatory diagram.

FIG. 7 is an explanatory diagram of the operation of a conventional half-split type flange bearing.

[Explanation of symbols]

1: Body, 2a, 2b: Flange, 3a, 3b, 3c: Bearing surface, 3d: Notch, 4: Bearing with half-split flange, 5: Crankshaft, 5a: Journal, 5b, 5c: Annular Side, 6: Cylinder block (main housing), 7: Bearing cap (auxiliary housing), 8: Bolt, 9: Housing.

Claims (1)

[Scope of utility model registration request] Claim 1: The crankshaft is rotatably supported by a semi-cylindrical body, which is interposed between a main housing and a sub-housing that are joined together by bolts, and which is connected to the center of the body. A pair of half-split flanged bearings in which the flanges, which are connected to both ends in the axial direction through circumferential notches, are in close contact with opposing annular side surfaces of the crankshaft, and the bearing surfaces of the flanges are , a half-split flange bearing characterized in that it forms a convex curved surface that smoothly connects to a notch and extends in the radial direction.