JPH0340248B2 - - Google Patents

Abstract

PURPOSE:To improve the circulation of a lubricating oil, by providing two openings at an outer peripheral surface of a journal shaft and a pin shaft, and supplying the lubricating oil around the pin shaft. CONSTITUTION:An oil passage 8 and an oil hole 9 are opened at 8a and 9a, respectively, at substantially opposite positions of an outer peripheral surface of a journal shaft 2. Accordingly, a lubricating oil is supplied from the openings 8a and 9a to the journal shaft 2, thereby increasing a quantity of the lubricating oil to be supplied to the journal shaft 2. On the other hand, the oil passage 8 and an oil hole 10 communicated therewith are opened at 8b and 10a, respectively, to a pin shaft 3. Accordingly, the lubricating oil supplied through the oil passage 8 is supplied from the openings 8b and 10a to the periphery of the pin shaft 3, thereby improving circulation of the lubricating oil.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a so-called hollow crankshaft in which a journal shaft and a pin shaft are formed into a hollow shape by providing a hollow portion therein. This invention relates to an oil passage device for guiding oil to a pin shaft.

[Conventional technology]

Conventionally, in this type of hollow crankshaft, the oil passage for guiding the lubricating oil in the journal part to the pin shaft was formed by casting a thin pipe forming the oil passage at the same time as casting the hollow crankshaft. This required a great deal of effort.

Therefore, as a prior art, Japanese Patent Publication No. 56-53122 discloses that a build-up portion is formed in the cavity of the journal shaft and the cavity of the pin shaft at the same time as the crankshaft is cast, and the oil is applied to the build-up portion. It is proposed that a passageway be built.

[Problem to be solved by the invention]

However, as in this prior art, the oil passage provided in the hollow crankshaft has only one opening to the journal shaft and the pin shaft, so it is difficult to introduce the lubricating oil in the journal shaft into the oil passage. The amount of lubricating oil that can be produced is small, and the distribution of lubricating oil from the oil passage to the outer circumferential surface of the pin shaft is also poor, resulting in insufficient lubricating oil supply to the pin shaft, resulting in oil shortage during high-speed rotation.

The present invention aims to solve the problems of the prior art in the oil passage of a hollow crankshaft.

[Means to solve the problem]

In order to achieve this object, the present invention provides that each of the journal shaft and the pin shaft is formed into a hollow shape by providing a hollow part therein, and that the journal shaft and the pin shaft are formed with an integrally formed overlay inside the hollow part. In a hollow crankshaft, an oil passage communicating between the outer circumferential surface of the journal shaft and the outer circumferential surface of the pin shaft is bored in the hollow part so as not to communicate with each of the hollow parts, the outer circumferential surface of the journal shaft of the oil passage. The opening for the oil passage and the opening for the outer circumferential surface of the pin shaft of the oil passage are arranged on both the left and right sides with respect to the normal line connecting the center of the journal shaft and the center of the pin shaft. An oil hole is provided in the built-up part formed in the part, which communicates the opening of the oil passage with respect to the outer peripheral surface of the journal shaft and the outer peripheral surface on the substantially opposite side of the journal shaft,
The oil passage is bored at an inclination that is substantially the same as the inclination direction of the oil passage when viewed from the axial direction of the crankshaft, and a built-up part formed in the cavity of the pin shaft is provided with an outer circumferential surface of the pin shaft and the above-mentioned oil passage. The oil hole communicating with the oil passage is formed at a location eccentric from the center of the pin shaft toward the journal shaft.

[Action/effect of the invention]

With this configuration, the oil passage and the oil hole are opened at substantially opposite positions on the outer circumferential surface of the journal shaft, so that the oil passage to the pin shaft carries the lubricating oil for the journal shaft. is introduced from two openings at the same time,
While it is possible to increase the amount of lubricating oil to the pin shaft, since the pin shaft also has two openings, the oil passage and the oil hole that communicates with this, lubricating oil can be transferred from the oil passage to these two openings. Since the lubricating oil can be distributed and supplied around the pin shaft, it is possible to improve the distribution of lubricating oil on the outer peripheral surface of the pin shaft.

The oil hole in the journal shaft is formed so as to be inclined in the same direction as the inclination direction of the oil passage when viewed from the axial direction of the crankshaft. Since the built-up part formed in the cavity can be partially used as the built-up part for drilling the oil passage in the journal shaft,
While it is possible to avoid blocking the hollow part in the journal shaft with the built-up part for the oil passage and oil hole, the oil hole in the pin shaft is bored at a location eccentric from the center of the pin shaft toward the journal shaft side. As a result, the built-up part formed in the hollow part of the pin shaft for drilling the oil hole can be partially used as the built-up part for drilling the oil passage in the pin shaft. This makes it possible to avoid blocking the cavity in the pin shaft with the built-up portion for the oil passage and oil hole.

Therefore, according to the present invention, the lubricity for the pin shaft can be reliably improved by the oil passage holes formed in both the journal shaft and the pin shaft. When drilling an oil hole, it is possible to reliably avoid blocking the cavities in the journal shaft and pin shaft.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a cast crank in which each journal shaft 2 and each pin shaft 3 are formed into a hollow shape with hollow parts 4 and 5 provided therein. A balance weight 7 is integrally provided at the other end of each crank arm 6, which represents a shaft and integrally connects both ends of each pin shaft 3 to the journal shaft 2.

The crankshaft 1 also includes a journal shaft 2.
An oil passage 8 is provided to communicate the outer circumferential surface of the pin shaft 3 with the outer circumferential surface of the pin shaft 3.

When the crankshaft 1 is viewed from the direction of the axis A, the oil passage 8 has an opening 8a with respect to the outer circumferential surface of the journal shaft, and an opening 8b of the oil passage 8 with respect to the outer circumferential surface of the pin shaft. It is inclined with respect to the normal line B so as to be located on both sides of the normal line B connecting the center 2o of the journal shaft 2 and the center 3o of the pin shaft 3.

Each of the journal shafts 2 is provided with an oil hole 9 that communicates with the opening 8a of the oil passage 8 on the outer peripheral surface of the journal shaft 2 and the outer peripheral surface on the substantially opposite side of the journal shaft 2.
The oil passage 8 is bored so as to be inclined in substantially the same direction as the direction in which the oil passage 8 is inclined with respect to the normal line B when viewed from the axial direction A. An oil hole 10 that communicates with the oil passage 8 is formed at a location eccentrically located by an appropriate distance (e) from the center 3o of the pin shaft 3 toward the journal shaft 2 side.

Further, reference numerals 11 and 12 in the figure are built-up parts integrally formed within the cavity 4 in order to form an oil passage 8 and an oil hole 9 in the journal shaft 2. Further, reference numerals 13 and 14 are built-up parts that protrude into the cavity 5 in order to form an oil passage 8 and an oil hole 10 in the pin shaft 3.

With this structure, the oil passage 8 and the oil hole 9 are opened at substantially opposite positions on the outer peripheral surface of the journal shaft 2.
The oil passage 8 to the pin shaft 3 has a journal shaft 2.
Since the lubricating oil for the pin shaft 3 is simultaneously introduced from the two openings 8a and 9a, the amount of lubricating oil for the pin shaft 3 can be increased. Since both the oil hole 10 and the oil hole 10 are open, the lubricating oil from the oil passage 8 can be distributed and supplied around the pin shaft 3 from these two openings 8b and 10a. can improve the lubricating oil surroundings.

Further, the oil hole 9 in the journal shaft 2
is formed so as to be inclined in the same direction as the inclination direction of the oil passage 8 when viewed from the direction of the axis A of the crankshaft 1, so that a hollow portion in the journal shaft 2 is formed in order to form the oil hole 9. The built-up part 12 formed in the journal shaft 2 can be partially used as the built-up part 11 for drilling the oil passage 8 in the journal shaft 2. While the passage 8 and the oil hole 9 can be prevented from being blocked by the built-up parts 11 and 12, the oil hole 10 in the pin shaft 3 can be prevented from being blocked.
By piercing the pin shaft 3 at a portion eccentrically located from the center 3o of the pin shaft 3 to the journal shaft 2 side by an appropriate distance (e), the pin shaft 3
Since the built-up part 14 formed in the cavity 5 in the pin shaft 3 can be partially used as the built-up part 13 for piercing the oil passage 8 into the pin shaft 3, the hollow part 5 in the pin shaft 3 can be Blocking of the oil passage 8 and the oil hole 10 by the built-up parts 13 and 14 can be avoided.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway front view of the crankshaft, and FIG. 2 is a partial cutaway view of the crankshaft.
FIG. 3 is a cross-sectional view taken from - in FIG. 1, and FIG. 4 is a cross-sectional view taken from - in FIG. 1. 1...Crankshaft, 2...Journal axis, 3...
...Pin shaft, 4, 5...Cavity part, 6...Crank arm, 7...Balance weight, 8...Oil passage, 9, 10...Oil hole, A...Crankshaft axis, B...Method Line, 11, 12, 13, 14...
Meat section.

Claims (1)

[Claims] 1 Each of the journal shaft and the pin shaft is formed into a hollow shape with a cavity provided therein, and the outer circumferential surface of the journal shaft is attached to the built-up part that is integrally formed in the cavity of the journal shaft and the pin shaft. In a hollow crankshaft, an oil passage is bored so as not to communicate with the outer peripheral surface of the journal shaft, and the oil passage communicates with the outer peripheral surface of the pin shaft. The openings to the outer circumferential surface of the shaft are arranged on both the left and right sides with respect to the normal line connecting the center of the journal shaft and the center of the pin shaft. An oil hole communicating between the opening of the oil passage with respect to the outer circumferential surface of the journal shaft and the outer circumferential surface on the substantially opposite side of the journal shaft is arranged in substantially the same direction as the inclination direction of the oil passage when viewed from the axial direction of the crankshaft. An oil hole that communicates the outer circumferential surface of the pin shaft with the oil passage is provided in the built-up part formed in the cavity of the pin shaft from the center of the pin shaft to the journal shaft side. An oil passage device for a hollow crankshaft, characterized in that it is bored at an eccentric location.