JP2501695Y2 - Thrust metal mounting structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to improvement of a thrust metal mounting structure.

[Conventional technology]

Conventionally, there is a risk that the thrust metal arranged at a predetermined position of the crank bearing may come off during the process of mounting the crankshaft, so that work such as application of vaseline for temporary fixing is required in the mounting process.

On the other hand, as shown in FIG. 6, the inner peripheral surface 25a surrounding the crank shaft of the locking portion 25 that is continuously provided on the side surface 25b of the bearing portion 20 of the crank bearing has an inner diameter in the axially outward direction E. The thrust metal 100 is formed so as to be gradually reduced and inclined, and the surface on the outer peripheral edge side of the thrust metal 100 is formed so as to be inclined along the inner peripheral surface 25a of the locking portion 25 and the thrust metal 100 is positioned at a predetermined position. When installing on Thrust Metal 1
The outer peripheral edge of 00 is fitted to the locking portion, and the thrust metal 10 is attached in the crankshaft mounting process.
A mounting structure has been proposed in which 0 does not easily fall off.

[Problems to be solved by the device]

However, in this configuration, the surface of the outer peripheral edge side of the thrust metal must be precisely processed so as to be inclined along the receiving surface of the locking portion, and this processing is difficult and leads to an increase in the cost of the thrust metal. There was a long-awaited measure to suppress this cost increase.

[Means for solving the problem]

The present invention has been proposed in view of the above, and a bearing portion that pivotally supports a journal portion of a crankshaft at a position spaced from a crank arm and a bearing portion that is connected to the bearing portion between the crank arm and the bearing portion. The inner peripheral surface of the journal portion is spaced from the journal portion so that a space surrounding the outer peripheral surface of the journal portion is formed between the crank arm and the side surface of the bearing portion facing the crank arm. A bearing component member having a formed locking portion, and an inner peripheral edge of itself that is housed in the space and faces the outer peripheral surface of the journal portion, and an outer peripheral edge of itself locks the inner peripheral surface of the locking portion. When the inner peripheral surface of the locking portion is formed such that the inner diameter thereof gradually decreases as the inner peripheral surface of the engaging portion moves away from the position adjacent to the bearing side surface. A thin-walled outer edge protruding portion formed by rolling is formed on at least a part of the outer peripheral edge of one side surface of the thrust metal, the other side surface side of the thrust metal faces the crank arm, and the one side surface side is The gist is that the outer edge protruding portion is brought into contact with the side surface of the bearing portion and is locked to the inner peripheral surface of the locking portion.

[Action]

Therefore, in the present invention, the thrust metal is disposed at a predetermined position such that one side surface of the thrust metal contacts the side surface of the bearing portion and the outer edge protruding portion is locked by the locking portion. In this case, since the inner peripheral surface of the locking portion is inclined so that the inner diameter gradually decreases as the distance from the side surface of the bearing portion increases, the outer edge protruding portion of the thrust metal receives from the inner peripheral surface of the locking portion. The vertical force has an axial component, and the force of this component is directed from the outside in the axial direction to the side surface of the bearing portion, and one side surface portion of the thrust metal is pressed against the side surface of the bearing portion. .

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 4, a journal portion 30 of the crankshaft is pivotally supported by a crank bearing composed of a cylinder block side bearing constituent member 20 and a bearing cap 50.

The thrust metal 10 has a semicircular inner peripheral edge 10b facing the outer peripheral surface of the journal portion 30 and a semicircular outer peripheral edge 10a on the side opposite to the inner peripheral edge 10b. One side
A thin-walled outer edge protrusion 110 is formed on the 10p side so as to protrude in the radial direction.

Further, the bearing constituent member 20 includes a bearing portion 20a and a locking portion 25 that is continuously provided on a side surface 25b of the bearing portion 20a facing the crank arm 40. The journal portion of the locking portion 25 is formed.
The inner peripheral surface 25a surrounding the 30 follows the axial direction outward E
The inner diameter is formed so as to gradually decrease and be inclined.

Then, the thrust metal 10 has the inner peripheral surface 25a of the locking portion 25.
It is arranged so as to be housed in a space formed between the outer peripheral surface of the journal section 30 and the journal section 30.

Specifically, the thrust metal 10 locks the outer edge protruding portion 110 on the outer peripheral edge 10a side of the thrust metal 10 to the inner peripheral surface 25a of the locking portion 25, and abuts one side surface 10p of the thrust metal 10 to the side surface 25b of the bearing portion 20a. The other side surface 10q is arranged so as to face the crank arm 40.

By the way, the outer edge protruding portion 110 keeps one side 10p side of the thrust metal 10 flat and keeps the outer peripheral edge 10 on the other side 10q side.
It is formed by rolling a with four spot-shaped presses at approximately equal intervals.

When mounting a crankshaft on a crank bearing, generally, the cylinder block is first turned upside down so that the bearing portion 20a of the bearing component 20 is faced from above, and then the thrust metal 110 is placed at a predetermined position. After that, the crankshaft is lowered from above the cylinder block so that the journal portion 30 abuts on the bearing portion 20a, and the thrust metal 90 and the thrust metal 90 sandwiching the journal portion 30 at a position corresponding to the bearing constituent member 20. The procedure of disposing the bearing cap 50 and tightening the bearing constituent member 20 and the bearing cap 50 to each other with bolts or the like is taken.

The thrust metal 90 is formed in the same manner as the thrust metal 10.

As described above, in this embodiment, the thrust metal 10 has its one side surface 10p attached to the bearing portion 2 when the crankshaft is attached.
Since the outer edge protruding portion 110 is brought into contact with the side surface 25b of the 0a and is locked by the slanting inner peripheral surface 25a, the outer edge protruding portion 110 receives from the inner peripheral surface 25a in the axial direction of the vertical resistance N. One side 10p of the thrust metal 10 is changed to the side 25b by the component Nh.
Will be forced on.

Therefore, according to the present embodiment, there is no need for temporary fixing work to prevent the crankshaft from falling off in the mounting process, and the mounting process is simplified, and at the same time, the outer edge of the thrust metal 10 is projected. Since the portion 110 can be formed by a general and simple method of pressing, it has an effect of suppressing the cost increase of the thrust metal 10.

Note that, as shown in FIG. 5, the outer edge protrusion 120 may be formed by rolling over substantially the entire circumference of the outer edge 10a of the thrust metal 10.

[Effect of device]

According to the present invention, it is possible to prevent the thrust metal from falling off during the work of mounting the crankshaft, and to omit the work for preventing the thrust metal from the mounting process to simplify the process. At this time, since the outer edge protruding portion of the thrust metal that is locked by the locking portion of the bearing can be formed by a simple rolling process, there is an effect that the manufacturing cost of the thrust metal can be kept low.

[Brief description of drawings]

FIG. 1 is a view for explaining an essential part of an embodiment of the present invention. A sectional view taken along the line I--I in FIG. 4 is shown in FIG. 4, and FIG. FIG. 3 is an enlarged view for explaining the parts in detail, FIG. 3 is a perspective view of the thrust metal in the first embodiment, FIG. 4 is a perspective view of the crank bearing in the same embodiment, and FIG. 5 is the present invention. FIG. 6 is a perspective view of a thrust metal as another embodiment of the above, and FIG. 6 is a sectional view showing a conventional example. 10 …… Thrust metal 10a …… Outer peripheral edge 10b …… Inner peripheral edge 10p …… One side surface 10q …… Other side surface 20 …… Bearing component 20a …… Bearing section 30 …… Journal section 40 …… Crank arm 50 …… Bearing Cap 110,120 …… Outer edge protrusion 25 …… Locking part 25a …… Inner peripheral surface 25b …… Side surface N …… Vertical force Nh …… (Vertical force) axial component

Claims (1)

(57) [Scope of utility model registration request] 1. A bearing part for axially supporting a journal part of a crank shaft at a position spaced from the crank arm, and a bearing part connected to the bearing part between the crank arm and the bearing part and the same as the crank arm. The inner peripheral surface of the journal portion has a locking portion formed at a distance from the journal portion so that a space surrounding the outer peripheral surface of the journal portion is formed between the side surface of the bearing portion facing the crank arm and a space surrounding the outer peripheral surface of the journal portion. A bearing component member, and an arc-shaped thrust metal housed in the space, the inner peripheral edge of which faces the outer peripheral surface of the journal portion, and the outer peripheral edge of the bearing which is locked to the inner peripheral surface of the locking portion. In that, the inner peripheral surface of the locking portion is formed such that the inner diameter gradually decreases as the inner peripheral surface moves away from the position adjacent to the side surface of the bearing portion,
At least a part of the outer peripheral edge of the one side surface of the thrust metal is formed with a thin-walled outer edge protruding portion by rolling, the other side surface side of the thrust metal faces the crank arm, and the one side surface side is the bearing portion. Thrust metal mounting structure characterized in that the outer edge protruding portion is brought into contact with the side surface and is locked to the inner peripheral surface of the locking portion.