JPH1113736A - Fastening structure of board plate part against crank shaft of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide fastening structure wherein with a clearance ensured between cylinder blocks or the like, a board plate part is reliably mounted on a crank shaft. SOLUTION: When a board plate part 4 is fastened against the web 22 of a crank shaft, a recessed part 22a provided on the bottom side with a seat surface 22b is formed in the web 22. Further, a recessed part 4a having a seat surface 4b making contact with a seat surface 22b fitted tin the recessed part 22a is formed in the board plate part 4 in a position matching with the recessed part 22a. The head part 5a of a bolt 5 is sunk in the recessed part 4a of the board plate part 4 and the plane seat surface 5c of a blot is clamped against the set surface 4b for fastening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening structure for fastening a plate member to a crankshaft of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, when a plate member is attached to a crankshaft of an internal combustion engine by bolts, a bending or torsional force acts during the operation of the crankshaft, and the bolts are easily loosened. Further, since it is difficult to secure a clearance between the crankshaft and the cylinder block or the like, it has not been conventionally performed to attach a plate member to the crankshaft.

[0003]

However, there are cases where it is desired to attach a plate member to the crankshaft for the purpose of improving the operation performance of the internal combustion engine, etc. In such a case, the plate member is preferably attached to the crankshaft. With the aim of providing a fastening structure that can fasten parts without loosening,
The gist is that, when fastening the plate plate component to the web and the counterweight portion of the crankshaft of the internal combustion engine with bolts, the web and the counterweight are formed with a recess having a seating surface on the bottom side, and A recess having a seat surface fitted into the recess and abutting on the seat surface is formed at a position aligned with the recess in the plate product plate component, and a bolt head is formed in the recess of the plate product plate component. The bolt is recessed, and the flat bearing surface of the bolt head is fastened and fastened to the bearing surface of the recess.

[0004]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of the periphery of a crankshaft of an internal combustion engine. A crankshaft 2 is disposed in a cylinder block 1 of the internal combustion engine, and the crankshaft 2 connects a connecting rod to which a piston 3 is connected. A crank pin 21, a web 22 forming a portion connecting the crank pin 21 to the journal, and a counterweight 23. In the present embodiment, the web 22 and the counterweight 23 of the crankshaft 2 are flat plates. The object plate component 4 is attached by bolts. Even when the plate object plate component 4 is attached to the web 22 and the counterweight 23, a clearance gap S is well formed between the cylinder block 1 and the plate object plate component 4. Without changing the size of conventional internal combustion engines. Preferably, the plate member 4 is fastened to the crankshaft 2 with bolts. As shown in an enlarged sectional view in FIG. 2, a concave portion 22a is formed in a concave shape on the outer surface of the web 22, This recess 2
A recess 4a is formed in the plate member 4 in advance so as to be aligned with the hole 2a. A bolt 5 is formed in the web 22 from the recess 4a side of the plate member 4.
d, and the flat bearing surface 5c of the bolt 5 is brought into contact with the bearing surface of the concave portion 4a of the plate member plate component 4 and fastened.

[0005] That is, as shown in a more detailed enlarged view in FIG.
a has a planar seating surface 22b forming the bottom side, and the outer periphery of the seating surface 22b is an inclined surface 22c. The concave portion 4a of the plate member 4 fitted into the concave portion 22a has a seat surface 4b on the bottom side that contacts the seat surface 22b, and an outer peripheral side is formed on an inclined surface 4c. 4c and the inclined surface 22c of the web 22 are formed so as to form a gap M in a fitted state, and the gap M is formed to slightly
Set up so that it rises from. The seating surface 4b of the plate member 4 is formed to have a diameter slightly larger than the tool diameter K shown in FIG. 3 and can be set to a size that allows easy insertion of a tool.

After the seat surface 4b of the concave portion 4a of the plate member 4 is brought into contact with the seat surface 22b of the concave portion 22a of the web 22, the bolt 5 is screwed from the outside of the seat surface 4b into the screw hole 22d. Screwed into the head 5a of the bolt 5
The flat seating surface 5c is brought into contact with the seating surface 4b of the plate member 4 and the hexagonal head 5a is tightened with a tool, and the flat seating surface 5c is firmly fastened to the seating surface 4b. A strong fastening state can be obtained, and in this state, the head 5a of the bolt 5 does not sink into the recess 4a and does not protrude outward, so that the clearance gap S with the cylinder block 1 is ensured well. Can be done.

FIG. 4 shows a modified example. In FIG. 4, a hexagonal groove 5b is formed at the center of the head 5a of the bolt 5, and for example, a hexagonal groove is formed in the hexagonal groove 5b from the outside. The wrench 6 is inserted, and the bolt 5 can be tightened by the hexagon wrench 6. With such a configuration, the tool diameter K can be set small, that is, the diameters of the concave portion 22a and the concave portion 4a can be reduced, and processing and the like can be facilitated. In this example, the concave portion 22a formed on the web 22 is illustrated, but the concave portion 22a is also formed on the outer surface of the counterweight 23, and the concave portion 4a of the plate member 4 is similarly formed.
a into the counterweight 23 and bolt 5
Thus, the plate member plate component 4 can be firmly fastened.

As described above, in the present embodiment, the plate member 4 can be satisfactorily attached to the web 22 and the counterweight 23 of the crankshaft, and the head 5a of the bolt does not protrude outward, so that the cylinder block or the like can be mounted. Good clearance is secured between
The flat seat portion 5c of the bolt 5 is firmly fastened to the seating surface 4b, and a highly reliable fastening state without loosening can be obtained.

[0009]

According to the present invention, when a plate member is fastened to a web and a counterweight portion of a crankshaft of an internal combustion engine with bolts, the web and the counterweight have a recess having a seating surface on a bottom side. And a recess having a seating surface fitted into the recess and abutting against the seating surface is formed at a position aligned with the recess in the plate-like plate component. Since the bolt head is submerged and the flat seat surface of the bolt head is tightened and fastened to the seat surface of the recess, the seat of the recess of the plate member is mounted on the seat surface of the recess formed in the web and the counterweight. Surface of the bolt, and the flat seating surface of the bolt head is firmly fastened to the seating surface of the concave part of the plate material plate part. Can be installed over door parts,
In addition, since the head of the bolt does not sink into the recess and jump out, there is an effect that a good clearance can be secured between the bolt and the cylinder block or the like.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a state in which a plate member is attached to a crankshaft.

FIG. 2 is an enlarged cross-sectional configuration diagram of a main part of FIG.

FIG. 3 is a cross-sectional configuration diagram showing a main part in a further tightened state in an enlarged manner.

FIG. 4 is an enlarged sectional configuration view of a main part corresponding to FIG. 3 showing a modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Crankshaft 4 Plate member 4a Recess 4b Seat 4c Inclined surface 5 Bolt 5a Head 5b Hexagonal groove 5c Plane seat 21 Crank pin 22 Web 22a Concave 22b Seat 22c Inclined surface 22d Screw hole 23 Counterweight S clearance gap M gap

Claims (1)

[Claims] When a plate member is fastened to a web and a counterweight of a crankshaft of an internal combustion engine by bolts, said web is mounted on said web.
2 and the counterweight 23 have a seating surface 22b on the bottom side.
And a concave portion 4a having a seating surface 4b fitted into the concave portion 22a and abutting against the seating surface 22b at a position aligned with the concave portion 22a. And the plate member 4
The head 5a of the bolt 5 is sunk into the recess 4a of the internal combustion engine, and the flat seat surface 5c of the bolt head 5a is fastened to the seat surface 4b of the recess 4a by fastening. Fastening structure for object plate parts.