JP3814507B2 - Crankshaft thrust bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thrust bearing device for a crankshaft constituting a machine such as a reciprocating engine or a compressor.
[0002]
[Prerequisite configuration]
The thrust bearing device for a crankshaft according to the present invention is intended for the one having the following premise configuration as shown in FIG. 1 (the present invention) or FIG. 4 (the prior art), for example.
[0003]
FIG. 1 shows a first embodiment of a thrust bearing device for a crankshaft according to the present invention. FIG. 1A is a front view of a main part of a hanger-type main bearing device for a crankshaft of a water-cooled vertical multi-cylinder diesel engine, and FIG. 1B is a cross-sectional view taken along line BB in FIG. 1C is a front view of the thrust bearing metal in FIG. 1A, and FIG. 1D is a cross-sectional view taken along the line D-D in FIG. FIG. 1E is an enlarged view of the E portion of FIG.
[0004]
FIG. 4 is a front view of a main part of a thrust bearing device of a hanger type main bearing device for a crankshaft of a diesel engine according to the prior art.
[0005]
The upper and lower split main bearing box (3) pivotally supports the journal (2) of the crankshaft (1), and the upper half bearing box (4) and the lower half bearing box (5) are stacked one above the other. Consists of things. Upper half bearing box (4) recessed form the lower chord semicircular each upper half thrust seat in front and rear end surfaces (6) (6) lower chord semicircular each upper half thrust bearing metal (7) (7) is fitted inside and seated. Lower half bearing housing (5) of the lower half thrust seat on chord semicircular shape that is recessed formed in the front and rear end faces (8) (8) above the chord semicircular each lower half thrust bearing metal (9) (9) is fitted and seated.
[0006]
A detent groove (10) is extended from the inner peripheral surface of the lower half thrust seat (8) to the outer diameter side. A non-rotating projection (11) is projected from the lower half thrust bearing metal (9) to the outer diameter side. The anti-rotation protrusion (11) is fitted in the anti-rotation groove (10) to prevent the lower half thrust bearing metal (9) from being fitted in the lower half thrust receiving seat (8). It is composed.
[0007]
[Prior art]
In the above premise configuration, as a configuration of the anti-rotation groove (10) and the anti-rotation projection (11), there is the conventional technology as shown in FIG. 4 and is configured as follows.
FIG. 4 is a front view of a main part of a thrust bearing device for a crankshaft of a diesel engine according to the prior art.
[0008]
To Rendesa from the bottom center on the chord semicircular inner peripheral surface of the lower half thrust seat (8) the detent groove (10) downwards. Lower half thrust bearing detent projections from the bottom center on the chord semicircular metal (9) (11) (11) in which is protruded downward.
[0009]
[Problems to be solved by the invention]
The above prior art has the following problems.
[ I. When the lower half thrust bearing metal (9) begins to drop due to impact or the like during assembly in the inverted posture, the lower half thrust bearing metal (9) falls out of the lower half thrust seat (8). ]
[0010]
The main bearing box (3) is assembled in the following procedure. 1 . Machine casings such as reciprocating engines or compressor crankcases are installed upside down. 2 . The journal (2) of the crankshaft (1) is inserted into and supported by the upper half bearing box (4) facing upward. 3 . The lower half bearing box (5) is turned upside down, and the upper half bearing box (4) is overlapped with the journal (2) from above.
[0011]
At the time of this procedure 3 , the lower half thrust bearing metal (9) is inserted into the lower half thrust receiving seat (8) with the grease interposed therebetween, and is in a state of being adhered by the adhesive force of the grease. Yes.
[0012]
In the middle of assembling the lower half bearing box (5) in this procedure 3 , when the lower half bearing box (5) is subjected to an impact such as a collision with another object, the lower half thrust bearing metal (9) is greased. Often breaks the adhesive strength of and begins to fall.
At this time, since the anti-rotation protrusion (11) comes out of the anti-rotation groove (10), the lower half thrust bearing metal (9) falls off from the lower half thrust receiving seat (8), and the lower half thrust receiving seat ( 8) There is a case where it cannot be assembled in the normal state fitted in step 8).
[0013]
An object of the present invention is to do as follows.
(I). When the lower half thrust bearing metal begins to fall due to impact during assembly in the inverted position, the lower half thrust bearing metal can be removed from the lower half thrust seat by supporting the detent protrusions in the detent groove. lose.
(B). The anti-rotation groove and the anti-rotation protrusion can be implemented in a simple shape such as a semicircle or a quadrangle, for example, so that the processing cost can be reduced.
[0014]
[Means for Solving the Problems]
In order to solve the above problems, the thrust bearing device for a crankshaft according to the present invention has a non-rotating groove (10) and a non-rotating protrusion (see FIG. 1, FIG. 2, or FIG. 3). As a feature of 11), the following feature configuration is added.
[0015]
FIG. 1 shows a first embodiment of a thrust bearing device for a crankshaft according to the present invention. FIG. 1A is a front view of a main part of a hanger-type main bearing device for a crankshaft of a water-cooled vertical multi-cylinder diesel engine, and FIG. 1B is a cross-sectional view taken along line BB in FIG. 1C is a front view of the thrust bearing metal in FIG. 1A, and FIG. 1D is a cross-sectional view taken along the line D-D in FIG. FIG. 1E is an enlarged view of the E portion of FIG.
[0016]
FIG. 2 shows a second embodiment of a thrust bearing device for a crankshaft according to the present invention. 2A is a front view of a main part of a hanger type main bearing device for a crankshaft of a water-cooled vertical multi-cylinder diesel engine, and FIG. 2B is a cross-sectional view taken along line BB in FIG. 2 (C) is a front view of the thrust bearing metal in FIG. 2 (A), and FIG. 2 (D) is a sectional view taken along the line DD in FIG. 2 (C). FIG. 2E is an enlarged view of the E portion of FIG.
[0017]
FIG. 3 shows a third embodiment of a thrust bearing device for a crankshaft according to the present invention. 3A is a longitudinal front view of a tunnel-type main bearing device of a crankshaft of a water-cooled vertical multi-cylinder diesel engine, and FIG. 3B is an exploded perspective view of a main bearing box in FIG.
[0018]
○ Invention 1. Claim 1. See FIG. 1, FIG. 2, or FIG.
From the top chord semicircular circumferentially mutually separated two positions on the inner circumferential surface of the lower half thrust seat (8), thereby Rendesa each detent groove forming a pair with each other (10) (10). From the lower half thrust bearing on chord semicircular circumferentially mutually separated two positions of the metal (9), to project the respective detent projections forming a pair with each other (11) (11).
[0019]
Set the maximum width (12) between the protrusions between the anti-rotation protrusions (11) and (11) to a value greater than the maximum width between the groove outlets (13) between the anti-rotation grooves (10) and (10). It is characterized by having constituted.
[0020]
○ Invention 2. Claim 2. See FIG. 1 or FIG.
The invention 2 is characterized in that the following feature configuration is added to the invention 1 described above.
Through holes (14), (14) are passed through the lower half bearing box (5) in the front-rear direction at each position of the pair of anti-rotation grooves (10), (10). The anti-rotation grooves (10) and (10) formed on the front and rear end surfaces of the lower half bearing box (5) are formed on the peripheral surface portions of both end portions of the through hole (14).
[0021]
○ Invention 3. Claim 3. See FIG. 1 or FIG.
The invention 3 is characterized in that the following feature configuration is added to the invention 2 described above.
Each through-hole (14) has an axial cross-sectional shape that is circular. Each of the anti-rotation protrusions (11) is formed in an arc plate shape.
[0022]
【The invention's effect】
The crankshaft thrust bearing device of the present invention has the following effects.
○ Invention 1. Claim 1. See FIG. 1, FIG. 2, or FIG.
[ I. When the lower half thrust bearing metal (9) begins to fall due to impact or the like during assembly in an inverted position, the pair of anti-rotation protrusions (11), (11) form a pair of anti-rotation grooves (10), (10). Since it is supported and supported by the left and right inner peripheral surfaces, the lower half thrust bearing metal (9) does not fall out of the lower half thrust receiving seat (8). ]
[0023]
The main bearing box (3) is assembled in the following procedure. 1 . Machine casings such as reciprocating engines or compressor crankcases are installed upside down. 2 . The journal (2) of the crankshaft (1) is inserted into and supported by the upper half bearing box (4) facing upward. 3 . The lower half bearing box (5) is turned upside down, and the upper half bearing box (4) is overlapped with the journal (2) from above.
[0024]
At the time of this procedure 3 , the lower half thrust bearing metal (9) is inserted into the lower half thrust receiving seat (8) with the grease interposed therebetween, and is in a state of being adhered by the adhesive force of the grease. Yes.
[0025]
In the middle of assembling the lower half bearing box (5) in this procedure 3 , when the lower half bearing box (5) is subjected to an impact such as a collision with another object, the lower half thrust bearing metal (9) is greased. Often breaks the adhesive strength of and begins to fall. .
At this time, as shown in FIG. 1 (E), the pair of anti-rotation protrusions (11), (11) are supported and supported by the left and right inner peripheral surfaces of the pair of anti-rotation grooves (10), (10). . For this reason, the lower half thrust bearing metal (9) does not fall out of the lower half thrust seat (8), and it is accurately and simply put into a proper state in which the lower half thrust seat (8) is fitted. Can be assembled.
[0026]
[B. The pair of anti-rotation grooves (10) and (10) and anti-rotation protrusions (11) and (11) can be implemented in a simple shape such as a semicircular shape or a square shape, and the processing cost can be reduced. ]
[0027]
The pair of anti-rotation grooves (10) and (10) and anti-rotation protrusions (11) and (11) can be implemented in a simple shape such as a semicircular shape or a square shape, and have a special shape such as a T shape. Therefore, the processing cost can be reduced and the process can be carried out at a low cost.
[0028]
○ Invention 2. Claim 2. See FIG. 1, FIG. 2, or FIG.
The invention 2 has the following effects in addition to the effects [A] and [B] of the invention 1.
[C. By, for example, drilling the through-hole (14) in the lower half bearing box (5) of the end wall of the ladder frame, the anti-rotation groove (10) located inside the ladder frame can be easily and efficiently formed. The machining cost can be reduced. ]
[0029]
For example, in a multi-cylinder engine, the lower half bearing boxes (5) of a plurality of main bearing boxes (3) arranged intermittently along the axial direction of the crankshaft (1) There are cases in which a ladder frame type lower half bearing box is formed by casting into a shape integrally connected by a connecting wall.
[0030]
In the lower half bearing box of this ladder frame type, the detent groove (10) located on the inner wall surface of the lower half bearing box (5) of the end wall of the ladder frame is difficult to form by machining, The machining cost is expensive.
[0031]
The reason is that the rotary transmission shaft such as an end mill must be bent at a right angle in the narrow internal space of the ladder frame, and the rotary blade attached to the tip of the rotary transmission shaft must be inserted into the narrow internal space. This is because it is difficult to reach the target machining location by supporting the wall of the ladder frame, and special machining must be devised.
[0032]
In the second aspect of the present invention, the through-hole (14) is machined from the outside by, for example, drilling or broaching in the lower half bearing box (5) of the end wall of the ladder frame, so that it is positioned inside the ladder frame. The anti-rotation groove (10) can be formed easily and efficiently, and the machining cost can be reduced.
[0033]
○ Invention 3. Claim 3. See FIG. 1 or FIG.
The invention 3 has the following effects in addition to the effects [A] and [B] of the invention 1.
[D. The anti-rotation groove (10) located inside the lower half bearing box (5) of the end wall of the ladder frame can be formed only by drilling from the outside of the end wall of the ladder frame, making it extremely simple, efficient and inexpensive. Can be machined. ]
[0034]
In the above-mentioned ladder frame type lower half bearing box, the non-rotating groove (10) located inside the lower half bearing box (5) of the end wall of the ladder frame can be formed only by drilling from the outside of the end wall of the ladder frame. Since it can be formed, it can be machined very simply, efficiently and inexpensively, and its implementation cost can be greatly reduced.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a thrust bearing device for a crankshaft according to the present invention will be described below with reference to the drawings.
[0036]
Embodiment 1 Claims 1, 2, and 3. See FIG.
FIG. 1 shows a first embodiment of a thrust bearing device for a crankshaft according to the present invention. FIG. 1A is a front view of a main part of a hanger-type main bearing device for a crankshaft of a water-cooled vertical multi-cylinder diesel engine, and FIG. 1B is a cross-sectional view taken along line BB in FIG. 1C is a front view of the thrust bearing metal in FIG. 1A, and FIG. 1D is a cross-sectional view taken along the line D-D in FIG. FIG. 1E is an enlarged view of the E portion of FIG.
[0037]
In FIG. 1, reference numeral 21 denotes a crankcase integrally cast at the lower part of a cylinder block of a water-cooled vertical multi-cylinder diesel engine. (22) is a ladder frame, (23) is an oil pan, and (24) is a ladder frame fixing bolt. (25) is the upper half radial bearing metal, and (26) is the lower half radial bearing metal.
[0038]
A plurality of journals (2) formed in series in the axial direction of the crankshaft (1) are pivotally supported by respective upper and lower split main bearing boxes (3). Yes. Each of the upper and lower split-shaped main bearing boxes (3) is composed of an upper half bearing box (4) and a lower half bearing box (5) that are vertically stacked. The upper half bearing box (4) is cast integrally with the crankcase (21).
[0039]
Each journal (2) of the crankshaft (1) is composed of an upper half radial bearing metal (25) and an upper half bearing box (4) and a lower half bearing box (5). The lower half radial bearing metal (26) is rotatably supported.
The lower half bearing boxes (5) of the plurality of main bearing boxes (3) arranged intermittently along the axial direction of the crankshaft (1) are connected together by left and right connecting walls. The ladder frame (22) is formed by casting into a rectangular shape and formed as a ladder frame type lower half bearing box.
[0040]
Of the plurality of main bearing boxes (3), only one main bearing box (3) located in front is provided with a thrust bearing metal. This thrust bearing metal is configured as follows.
[0041]
Upper half bearing housing to the upper half of the lower chord semicircular shape that is recessed formed on front and rear end faces (4) thrust seat (6) (6), the lower chord semicircular each upper half thrust bearing metal (7 ) (7) is fitted and seated. In the lower half bearing housing (5) of the lower half thrust seat on chord semicircular shape that is recessed formed in the front and rear end faces (8) (8), the upper chord semicircular each lower half thrust bearing metal (9 ) (9) is fitted and seated.
[0042]
A detent groove (10) is extended from the inner peripheral surface of the lower half thrust seat (8) to the outer diameter side. A non-rotating projection (11) is projected from the lower half thrust bearing metal (9) to the outer diameter side. The anti-rotation protrusion (11) is fitted in the anti-rotation groove (10) to prevent the lower half thrust bearing metal (9) from being fitted in the lower half thrust receiving seat (8).
[0043]
From the lower half thrust seat (8) the inner circumferential surface on the chord semicircular circumferentially mutually spaced two places of so Rendesa each detent groove forming a pair with each other (10) (10). From the lower half thrust bearing on chord semicircular circumferentially mutually separated two positions of the metal (9), to project the respective detent projections forming a pair with each other (11) (11).
[0044]
Set the maximum width (12) between the protrusions between the anti-rotation protrusions (11) and (11) to a value larger than the maximum width between the groove outlets (13) between the anti-rotation grooves (10) and (10). .
Through holes (14), (14) are passed through the lower half bearing box (5) in the front-rear direction at each position of the pair of anti-rotation grooves (10), (10). The anti-rotation grooves (10) and (10) formed on the front and rear end surfaces of the lower half bearing box (5) were formed on the peripheral surface portions of both end portions of the through hole (14). Each through-hole (14) has an axial cross-sectional shape formed in a circle, and each of the anti-rotation protrusions (11) formed in an arc plate shape.
[0045]
○ Other embodiments.
In the second and third embodiments described below, a part of the configuration of the first embodiment is changed as follows.
[0046]
Embodiment 2 Claims 1 and 2. See FIG.
FIG. 2 shows a second embodiment of a thrust bearing device for a crankshaft according to the present invention. 2A is a front view of a main part of a hanger type main bearing device for a crankshaft of a water-cooled vertical multi-cylinder diesel engine, and FIG. 2B is a cross-sectional view taken along line BB in FIG. 2 (C) is a front view of the thrust bearing metal in FIG. 2 (A), and FIG. 2 (D) is a sectional view taken along the line DD in FIG. 2 (C). FIG. 2E is an enlarged view of the E portion of FIG.
[0047]
In the second embodiment, a part of the configuration of the first embodiment is changed as follows.
The cross-sectional shape perpendicular to the axis of each through hole (14) is changed from the circle shown in FIG. 1 to the square shown in FIG. Each of the anti-rotation protrusions (11) is changed from the arc plate shape shown in FIG. 1 to the square plate shape shown in FIG.
[0048]
Embodiment 3 Claims 1, 2, and 3. See FIG.
FIG. 3 shows a third embodiment of a thrust bearing device for a crankshaft according to the present invention. 3A is a longitudinal front view of a tunnel-type main bearing device of a crankshaft of a water-cooled vertical multi-cylinder diesel engine, and FIG. 3B is an exploded perspective view of a main bearing box in FIG.
[0049]
The third embodiment is obtained by changing a part of the configuration of the first embodiment as follows. That is, the main bearing device is changed from the hanger type shown in FIG. 1 to the tunnel type shown in FIG.
[0050]
The upper half bearing box (4) and the lower half bearing box (5) are stacked one above the other and fixed with a pair of left and right bearing box assembly bolts (30), so that the main bearing box (3) is a disc. It is formed in a shape. Bearing box support holes (29) are formed in the front and rear end walls or the partition wall (28) of the crankcase (21). The main bearing box (3) is fitted and supported in the bearing box support hole (29) and is fixed by the main bearing box fixing bolt (31).
[0051]
[Development plan]
The present inventor considered the following development plan in the course of developing the present invention. In this development plan, in the above premise configuration, the anti-rotation groove (10) and the anti-rotation protrusion (11) are configured as shown in FIG.
FIG. 5 is a front view of a main part of a thrust bearing device of a hanger type bearing device for a crankshaft of a diesel engine according to a development plan of the present invention.
[0052]
The lower half bearing box (5) constituting the main bearing box (3) comprises a main bearing cap. The anti-rotation groove (10) and the anti-rotation protrusion (11) are both formed in an inverted T shape.
[0053]
When the lower half bearing box (5) is placed in an inverted position and assembled with the upper half bearing box (4) in an inverted position, the inverted T-shaped detent protrusion (11) By engaging with the retaining groove (10), the lower half thrust bearing metal (9) is prevented from falling off from the lower half thrust receiving seat.
[Brief description of the drawings]
FIG. 1 shows a first embodiment of a thrust bearing device for a crankshaft according to the present invention. 1A is a front view of a main part of a hanger-type main bearing device for a crankshaft of a water-cooled vertical multi-cylinder diesel engine, and FIG. 1B is a cross-sectional view taken along the line BB in FIG. 1C is a front view of the thrust bearing metal in FIG. 1A, and FIG. 1D is a cross-sectional view taken along the line DD in FIG. 1C. FIG. 1E is an enlarged view of the E portion of FIG.
FIG. 2 shows a second embodiment of a thrust bearing device for a crankshaft according to the present invention. 2A is a front view of a main part of a hanger-type main bearing device for a crankshaft of a water-cooled vertical multi-cylinder diesel engine, and FIG. 2B is a cross-sectional view taken along line BB in FIG. 2C is a front view of the thrust bearing metal in FIG. 2A, and FIG. 2D is a cross-sectional view taken along the line DD in FIG. FIG. 2E is an enlarged view of the E portion of FIG.
FIG. 3 shows a third embodiment of a thrust bearing device for a crankshaft according to the present invention. 3A is a longitudinal front view of a tunnel-type main bearing device of a crankshaft of a water-cooled vertical multi-cylinder diesel engine, and FIG. 3B is an exploded perspective view of a main bearing box in FIG.
FIG. 4 is a front view of a main part of a thrust bearing device of a hanger type main bearing device for a crankshaft of a diesel engine according to the prior art.
FIG. 5 is a front view of a main part of a thrust bearing device of a hanger type main bearing device for a crankshaft of a diesel engine according to a development plan of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Crankshaft, 2 ... Journal, 3 ... Main bearing box, 4 ... Upper half bearing box, 5 ... Lower half bearing box, 6 ... Upper half thrust receiving seat, 7 ... Upper half thrust bearing metal, 8 ... Lower half thrust 9: Lower half thrust bearing metal, 10: Anti-rotation groove, 11: Anti-rotation protrusion, 12: Maximum width between protrusions, 13: Maximum width between groove outlets, 14: Through hole.

Claims (3)

The upper and lower split main bearing box (3) pivotally supports the journal (2) of the crankshaft (1), and the upper half bearing box (4) and the lower half bearing box (5) are stacked one above the other. Consists of things,
Upper half bearing box (4) recessed form the lower chord semicircular each upper half thrust seat in front and rear end surfaces (6) (6) lower chord semicircular each upper half thrust bearing metal (7) (7) internally fitted to cause the seated, the upper chord semicircle on each lower half thrust seat of the recessed form the top chord semicircle front and rear end faces of the lower half bearing housing (5) (8) (8) Each lower half thrust bearing metal (9) (9) is seated,
A non-rotating groove (10) is extended from the inner peripheral surface of the lower half thrust seat (8) to the outer diameter side, and a non-rotating protrusion (11) is projected from the lower half thrust bearing metal (9) to the outer diameter side. The anti-rotation protrusion (11) is fitted in the anti-rotation groove (10) to prevent the lower half thrust bearing metal (9) from being fitted in the lower half thrust receiving seat (8).
In the thrust bearing device of the crankshaft configured as follows,
Lower half thrust seat (8) each detent groove (10) forming a pair with each other from the inner peripheral surface on chord semicircular circumferentially mutually spaced two places of (10) was Rendesa lower half thrust bearing is projected to the detent projections to be paired with each other from the strings semicircular circumferentially mutually separated two positions on the metal (9) (11) (11),
Set the maximum width (12) between the protrusions between the anti-rotation protrusions (11) and (11) to a value greater than the maximum width between the groove outlets (13) between the anti-rotation grooves (10) and (10). ,
A thrust bearing device for a crankshaft characterized by comprising. The thrust bearing device for a crankshaft according to claim 1,
At each position of the pair of anti-rotation grooves (10), (10), through holes (14), (14) are passed through the lower half bearing box (5) in the front-rear direction so that the lower half bearing box (5) Each of the anti-rotation grooves (10) (10) formed on the front and rear end surfaces is formed on each peripheral surface portion of both end portions of the through hole (14). The thrust bearing device for a crankshaft according to claim 2,
The cross-sectional shape perpendicular to the axis of each through hole (14) is formed in a circular shape, and each of the anti-rotation protrusions (11) is formed in an arc plate shape.

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