JPH0322485Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a bearing lubricating device in a rotary piston engine.

(Prior art) Generally, in a rotary piston engine, an eccentric shaft is supported in the casing via a main bearing, and a main bearing of the eccentric shaft is formed in the casing, as shown in Utility Model Publication No. 59-18085, for example. Oil is supplied through an oil passageway for lubrication.

However, the main bearing may be displaced in the axial direction or circumferential direction due to vibrations caused by engine rotation. In particular, when oil is pumped into the eccentric shaft through the oil hole formed in the main bearing, the oil may flow into the eccentric shaft due to misalignment of the main bearing in the axial or circumferential direction. This will cut off the path of lubrication, resulting in poor lubrication.

(Purpose of the invention) In view of the above-mentioned circumstances, the object of the present invention is to provide a bearing lubricating device for a rotary piston engine that has a simple structure and is capable of preventing the main bearing from slipping out and preventing it from rotating.

(Structure of the invention) The lubricating device of the invention is characterized in that a pipe member is provided in the downstream part of the oil supply passage in the casing, and the tip of this pipe member is engaged with the oil inlet opening in the main bearing. It is something to do.

(Effects of the invention) According to the invention, the main bearing can be prevented from slipping off and rotating with a simple structure of simply engaging the pipe member provided in the oil supply passage with the main bearing. Interference with parts can be prevented and good lubricity can be obtained. Furthermore, in the case where oil is pumped into the eccentric shaft, the oil path can be secured.

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

FIG. 1 is an overall sectional view of a two-cylinder rotary piston engine. Each rotor 5 is supported on an eccentric shaft 6 for planetary rotation. The eccentric shaft 6 is supported by main bearings 7 and 8 at the front and rear ends of the casing 4, and also supports the rotor 5 via a rotor bearing 9.

Oil supply passages 11 and 12 are formed in the front and rear side housings 3 and 3, through which oil discharged from the oil pump 10 is fed under pressure, and these oil supply passages 11 and 12 pass through the main bearings 7 and 8 and are connected to the main bearings 7 and 8. It communicates with an oil passage 13 formed at the center of the eccentric shaft 6. This oil passage 13 supplies oil to the rotor bearing 9 and also to the cooling chamber 5a of the rotor 5.

As shown in FIGS. 2 and 3, the rear main bearing 8 is a main bearing 8 (metal) that is fitted into the inner circumference of the stationary gear 14 mounted on the rear side housing 3. There is.

The downstream side of the oil supply passage 12 formed on the wall surface of the side housing 3 is constituted by an oil hole 12a opened in the stationary gear 14, and a pipe member 15 is inserted into this oil hole 12a. . On the other hand, an oil introduction hole 16 is formed in the main bearing 8, and the tip of the pipe member 15 engages with this oil introduction hole 16. Further, the eccentric shaft 6 is connected to the oil passage 13 at the center thereof through a communication hole 13 a formed in the radial direction of the eccentric shaft 6 and communicating with the oil introduction hole 16 .

Oil introduction hole 16 of the main bearing 8 above
is provided in a stepped shape, and the tip end of the pipe member 15 abuts against the step portion 16a to restrict its position. Thereby, the tip portion of the pipe member 15 is configured not to come into sliding contact with the eccentric shaft 6.

Therefore, the pipe member 15 and the oil introduction hole 1
6, the main bearing 8 is prevented from coming off and rotating.

Note that the front main bearing 7 also employs a similar engagement structure between the pipe member 15 and the oil introduction hole 16. Further, in the above embodiment, the pipe member 15 is inserted into the oil supply passages 11 and 12 for the main bearings 7 and 8, but the oil supply passage itself may be constructed by this pipe member. It's good.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a rotary piston engine according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a rear main bearing portion, and FIG. 3 is a detailed view of the portion shown in FIG. 2. DESCRIPTION OF SYMBOLS 1... Rotary piston engine, 2... Rotor housing, 3... Side housing, 4... Casing, 6... Eccentric shaft, 7, 8... Main bearing, 1
1, 12...Oil supply passage, 12a...Oil hole,
15...Pipe member, 16...Oil introduction hole.

Claims (1)

[Scope of utility model registration request] In a rotary piston engine in which an eccentric shaft is supported in a casing via a main bearing, and oil is supplied to the main bearing from an oil supply passage formed in the casing, a pipe is provided in the downstream portion of the oil supply passage in the casing. A bearing lubricating device for a rotary piston engine, characterized in that a member is provided, and a tip end of the pipe member is engaged with an oil inlet opened in the main bearing.