JPS5865314A - Crank device of internal-combustion engine - Google Patents

Abstract

PURPOSE:To interpose washers in an integral type crank device, by forming the washer to a half split state, forming flange parts in a connecting-rod big-end and integrally forming the connecting-rod big-end to a crank pin under a condition in which said washers are housed in said flange parts. CONSTITUTION:Half split washers 24 are housed in flange parts 23, formed to opening ends of a bearing hole 22 in a big-end part 16 of a connecting-rod 15, further end faces of a crank arm 12 and the washers 24 are arranged contactable. Then the big-end part 16 of the connecting-rod 15 is formed to integrally arranged constitution with a crank pin 13. In this way, the washer 24 can be interposed between the crank arm 12 and the big-end part 16, and the end faces of the crank arm 12 can be prevented from directly being contacted to the end faces of the big-end part 16. While each slip speed of the arm 12 and the big-end part 16 for the washer 24 is decreased as compared with a slip speed caused between the both arm and big-end at their direct contact, and occurrence of seizure and the like can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crank device for an internal combustion engine, and more particularly, to a crank pin in which a crankshaft and a crank arm are integrated, a split-type connecting rod is connected to a crank pin in which a crankshaft and a crank arm are integrated. The present invention relates to a crank device for an internal combustion engine to which a large end is connected.

Conventionally, in an assembled crank device in which the crankshaft and crank arm were separated, and the crank pin was separated, when assembling the crankshaft, crank arm, crank pin, and connecting rod, the inner end surface of the crank arm and the connecting rod were It is possible to insert a washer between the end face of the large end and the inner end face of the crank arm, thereby preventing direct contact between the end face of the large end of the connecting rod and the inner end face of the crank arm. Each sliding speed with respect to the washer is reduced compared to the sliding speed that occurs between the two when they are in direct contact, making it possible to prevent heat generation, seizure, etc. between the two.

However, in an integrated crank device in which the crankshaft and crank arm are integrated into the crank pin,
Since the crank arm and the crank pin are integrated in advance, it is impossible to insert a washer between the end surface of the large end of the connecting rod and the inner end surface of the crank arm. Conventionally, therefore, the end surface of the large end of the connecting rod is plated with silver to serve as a lubricant for the contact between the end surface of the large end of the connecting rod and the inner end surface of the crank arm. In this case, the size of the device can be reduced compared to a structure in which a washer is inserted, but since the two are in direct contact, the sliding speed between them increases, making it difficult to prevent heat generation, seizure, etc. It is disadvantageous.

The present invention provides a crank device for an internal combustion engine in which a washer can be interposed between the inner end surface of the crank arm and the end surface of the large end of the connecting rod without increasing the size of the integrated crank device. The purpose is to provide money.

In order to achieve the above object, the present invention provides a crankshaft and a crank arm, in which a split-type large end of a connecting rod is connected to a crank pin that is integrated with the crankshaft and a crank arm through a half-shaped bearing. In a cracking device for an internal combustion engine, a half-split washer t1 is formed in a flange part K formed on an open end surface of a large end bearing hole of the connecting rod.

The end of the bearing is housed in a state that completely surrounds the outside, and the end face of the crank arm and the end face of the washer can come into contact with each other. .

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing one embodiment of a crank device for an internal combustion engine according to the present invention, FIG. 2 is a sectional view of the main part thereof, and FIG. FIG. The crankshaft 11, crank arm 12, and crank pin 13 are integrated, and the crank pin 13 includes:
The large end 16 of the connecting rod 15 is connected to the connecting rod 15 via the split bearing 14.
are connected.

Here, the bearing 14 is formed from a needle 17 and a retainer 18 that is divided into two parts. Nine, the large end 16 of the connecting rod 15 is attached to the main body fls 19 and the cap part 20.
Both are tightened with bolts 21, and the bearing 14t can be supported on the back side in the bearing hole 22.

Butterfly-shaped and annular flange portions 23 are protruded from the left and right open end surfaces of the bearing hole 22 of the large end portion 16, and a half-split washer 24 can be accommodated in the flange portions 2-3. There is. Here, the width W1 of the bearing hole 22 is set smaller than the width W2 of the retainer 18, and the inner diameter D1 of the washer 24 is set larger than the outer diameter D2 of the retainer 18. When assembling the big end mts of the bearing 14 and the connecting rod 15 to the bearing 13, the bearing 1
Under the condition surrounding the outer end of the retainer 18 of 4, the tsuba lI
It is housed within 23. In addition, when housed in the flange 23, the width W3 formed by the end surfaces of the left and right washers 24 is set to be larger than the width W2 of the retainer 180, and larger than the width W4 formed by the end surfaces of the left and right flange 23. Because there is
Bearing 14 to crank pin 13, big end 1 of connecting rod 15
6 is sometimes assembled by attaching the end face of the crankshaft 12 and the large end 1.
The end face of 6 is not in direct contact with the crank arm 1.
The large end 11 contacts the outer end surface of the end face expanding washer 24 of No.
K so that the end surface of 16 contacts the inner end surface of washer 24.
It has become.

Note that a chamfered portion 25 is provided on the end face of the divided portion of the washer 24, particularly on the inner diameter side, and the inner diameter surface of the washer 24 contacts the outer circumferential surface of the retainer 18 and moves relatively, so that the washer 24
When the divided portion of the retainer 1B and the divided portion of the retainer 1B overlap in the circumferential direction as shown in FIG. There is.

According to the above embodiment, the large end 16 of the connecting rod 15 is connected to the crank pin 1 while the washer 24 is split in half and the washers 2 and 4 are accommodated in the flange 23 formed on the large end 16.
3, the washer 24 can be interposed between the crank arm 12 and the large end 16, and direct contact between the end surface of the crank arm 12 and the end surface of the large end 16 is prevented. The respective sliding speeds of both the washer 24 are reduced compared to the sliding speed that occurs between the two when they are in direct contact, making it possible to prevent heat generation, seizure, etc. between the two. Further, since the washer 24 is housed in the flange 23 while surrounding the outer periphery of the end of the retainer 18 of the bearing 14, the washer 24 is accommodated in the flange 23 so that the crank arm 12 and the large end 16
Even if the washer 24 is interposed between the bearing 14 and the bearing 14, the maximum width of the bearing 14 can be set to an appropriate value without increasing the overall size of the crank device. Note that when the crank device is operated, the bearing 14 moves in the same axial direction as the crank pin 13, and the end face of the retainer 18 may come into contact with the end face of the crank arm 12, but the sliding speed between the two is small. Therefore, problems such as heat generation and seizure do not occur between the two.

In addition, although the case where a needle bearing is used as the bearing 14 was explained in the above embodiment, the present invention is also applicable to the case where a flat bearing or the like is used as the bearing.

As described above, the present invention provides a crank for an internal combustion engine in which a split-type large end of a connecting rod is connected to a crank bin in which a crankshaft and a crank arm are integrated, via a half-shaped bearing. In the device, a half-shaped washer is
The connecting rod is accommodated in a flange formed on the open end surface of the large end bearing hole in a state surrounding the outer periphery of the end of the bearing, and the end surface of the crank arm and the end surface of the washer can be brought into contact with each other. This prevents direct contact between the end face of the crank arm and the end face of the large end of the connecting rod, and prevents seizure and heat generation between the two without increasing the size of the device. It has the effect of being able to.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention, FIG. 2 is a sectional view of a main part thereof, and FIG. 3 is a sectional view taken along the l1f--Tsuru line in FIG. 2. 11... Crankshaft, 12... Crank arm, 1
3°...Crank pin, 14...Bearing, 15...
Connecting rod, 16...large end, 23.=-2 flange, 24.
...Washer. Agent Patent Attorney Osamu Shiokawa Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) In the crank device of an internal combustion engine, the split-type large end of the connecting rod is connected to the crank pin, in which the crankshaft and crank arm are integrated, via a half-split bearing. A washer is housed in a flange formed on the open end surface of the large end bearing hole of the connecting rod in a state surrounding the outer periphery of the end of the bearing, and the end surface of the crank arm and the end surface of the washer are A crank device for an internal combustion engine, characterized in that it can be contacted.