JPH0681894B2 - Engine oil passage structure - Google Patents

Abstract

PURPOSE:To simplify the construction of oil passages by providing an oil chamber closed with a freely detachable plug at the branch and intersection of oil passages running within a thick wall such as a casing, forming a part of the oil passages from the internal surface of the wall and fitting a jet plug thereto. CONSTITUTION:A crankcase 9 is provided with an oil passage 12 for inlet side and another oil passage 13 for outlet side, for continuity to a clutch cover 5 and oil passages 10 and 11 at coupling part. An oil sump 23 is formed at the back of the crank shaft bearing 22 of the clutch cover 5 and a plug 24 is so set to the external surface of the pump 23 with a screw 25 as to be freely detachable. Oil passages 26 and 27 are formed on the internal surface of the oil sump 23 for continuity to the forward ends 10a and 11a of the oil passages 10 and 11. And the open ends thereof are fitted with jet plugs 28 and 29 and another jet plug 14 is fitted to the end of an oil passage running through the axial center of a crank shaft 1.

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an oil passage structure for an engine that passes through a thick portion such as a case.

[Technical background of the invention and its problems]

In the engine, the oil stored in the oil pan at the bottom bottom of the transmission case is pumped up by an oil pump linked to the engine, and is pumped to the crank bearing, the large end of the connecting rod, or the sliding part such as the valve mechanism for lubrication. Has become. In this case, the oil passage for sending the oil under pressure is usually formed in a thick part such as an engine case, but the shape of the case is not simple, so the oil passage will be bent more and the sliding It is necessary to arrange the jet for proper distribution to the portion (lubricating portion), and the formation of the oil passage requires complicated processing.

For example, FIG. 2 and FIG. 3 show that oil is supplied to the clutch housing 4 bearing portion 4a of the starting clutch 3 or the crank pin and the connecting portion of the large end of the connecting rod via the oil passage hole 2 passing through the axis of the crankshaft 1. The crankshaft 1 end is rotatably supported by an oil reservoir 6 provided on the inner surface of the clutch cover 5, and the oil reservoir 6 and the oil passage hole 2 opened to the crankshaft end surface are communicated with each other.

The oil reservoir 6 is communicated with an introduction-side oil passage 7 and a discharge-side oil passage 8 that pass through the thick portion of the clutch cover 5.
The oil passages 7 and 8 are bent at a substantially right angle along the shape of the clutch cover 5 and communicate with the oil passages 10 and 11 that are open to the mating surface with the crankcase 9.

The oil passages 10 and 11 are connected to the oil passages 12 and 13 provided in the crankcase 9 at the mating surfaces.

The oil is supplied to the oil reservoir 6 through the introduction-side oil passages 12, 10, and 7, and is introduced into the oil passage 2 of the crankshaft 1 through a part of the jet plug 14, and the remaining amount is the discharge-side oil passage 8, It is sent through 11 and 13 to other sliding parts and lubrication parts.

In the above oil passage structure, since the oil passages 10 and 11 are opened to the mating surfaces, they are formed at the time of molding the clutch cover by casting, and the oil passages 7 and 8 are drilled from the outer surface of the clutch cover 5 by drilling. Female screws 15 and 16 are bored in the outer ends of the oil passages 7 and 8, and blind plugs 17 and 18 are fastened to the female screws 15 and 16 to close them. At the same time, insert a jet plug in this part.

For this reason, machining the oil passage is troublesome, and
The bosses 15a and 16a of 15,16 and the heads of the blind plugs 17 and 18 easily overhang from the clutch cover 5 to easily get in the way.
The appearance is not appropriate either.

Further, for maintenance of the jet plug, it is necessary to remove the blind plugs 17 and 18 and the clutch cover 5 of the oil passages 7 and 8 respectively, which causes a problem of poor workability.

[Object of the Invention]

In view of the above-mentioned problems, the present invention aims to eliminate the blind plug to improve the workability and appearance and to maintain a plurality of jet plugs at one place. Provide a passage structure.

[Outline of Invention]

In order to achieve the above object, the present invention provides a crankcase of an engine with a case cover for covering a shaft end of a crankshaft, and a crankshaft end portion is supported by a bearing held inside the case cover. An oil chamber is formed in the cover so as to face the shaft end of the crankshaft, the oil chamber is opened to the outer surface of the case cover, and the opening is closed with a removable plug, while the inner wall of the oil chamber is used to drill the case. A cover is punched to form an introduction-side oil passage and a discharge-side oil passage, and a jet plug is fitted to an opening end of the oil passage on the oil chamber side.

Example of Invention

FIG. 1 is a vertical cross-sectional view of a clutch cover portion covering an engine crankshaft end portion showing an embodiment of the present invention.

The crankshaft 1 is provided with an oil through hole 2 which passes through the shaft center from the shaft end face, and the oil through hole 2 is formed in the clutch housing 4 bearing portion 4a of the starting clutch 3 or the crank pin 19 and the connecting end of the connecting rod. Through the oil communication holes 20 and 21.

A clutch cover 5 that is in contact with the crankcase 9 of the engine is covered around the starting clutch 3 as a case cover. In the crankcase 9, oil passages 12 (introduction side) and 13 (outlet side) are opened in the mating surfaces, and these oil passages 12 and 13 are provided in the clutch cover 5.
11 are connected to each. The oil passages 10 and 11 are substantially parallel to the crankshaft 1 and are formed as blind holes when the clutch cover 5 is molded by casting.

A bearing 22 is held on the inner surface of the clutch cover 5 facing the shaft end 1a of the crankshaft 1 to support the crankshaft end 1a. An oil sump 23 is formed behind the bearing 22 as an oil chamber. The oil sump 23 is provided so as to be opened on the outer surface of the clutch cover 5, and a plug 24 is detachably attached to the opening. The plug 24 is fastened by a screw 25 and is removable.

The clutch cover 5 is provided with oil passages 26, 27 which communicate from the inner peripheral wall of the oil reservoir 23 to the tip portions 10a, 10b of the oil passages 10, 11. These oil passages 26 and 27 are plug 24
With the oil tank removed, a hole is drilled from the inner peripheral wall of the oil sump 23 with a drill. Line xx shows the direction of movement of the drill. In this case, the oil passages 26 and 27 should not interfere with the advance / retreat of the drill.
Is set diagonally. Oil sump 23 in the oil passages 26, 27
Jet plugs 28 and 29 are fitted into the open ends on the side, respectively.

With the above configuration, in the normal state, the plug 24 is tightly plugged and the oil sump 23 is maintained in its original function. The oil enters the oil sump 23 through the introduction-side oil passages 12, 10, and 26, a part of which is supplied to the oil passage hole 2 of the crankshaft 1 and is sent to the clutch housing bearing portion 4a and the crankpin 19 portion. The remaining oil is sent to other lubricating parts and sliding parts via the outlet side oil passages 27, 11, 13. The distributed supply amount of oil stored in the oil sump 23 is regulated by the jet plugs 14, 28, 29.

When maintenance or the like is required, by removing the plug 24, the jet plugs 14, 28, 29 are exposed, and the maintenance and the like can be performed at one place.

〔The invention's effect〕

As described above, the oil passage structure of the engine according to the present invention includes the oil chamber in which the case cover is sealed by the detachable plug, and the oil passage is drilled from the inner peripheral wall of the oil chamber. With a jet plug fitted in the opening, it is possible to communicate with other oil passages at the drilled tip, so there is no hole on the outer surface, so there is no need for a blind plug like the conventional one.
Improves workability and appearance. Moreover, a plurality of jet plugs can be simultaneously maintained by removing one plug that can be freely attached to and detached from the case cover, thus improving maintainability. The complex refraction and branching of the oil passage arranged within the wall thickness of various cases having a complicated curved surface shape are arranged, and the effect of significantly reducing the processing and maintenance costs is obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a clutch cover portion covering an engine crankshaft end showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. The figure is an external view of the same as above. 1 ... Crank shaft, 2 ... Oil passage hole, 4 ... Clutch housing, 5 ... Clutch cover, 9 ... Crank case, 10,1
1,12,13 ... Oil passage, 23 ... Oil sump, 24 ... Plug, 2
6,27… Oil passage, 14,28,29… Jet plug.

Claims (1)

[Claims] 1. A crankcase of an engine is provided with a case cover for covering a shaft end of a crankshaft, and a bearing held inside the case cover supports an end of the crankshaft. An oil chamber opposite to the oil chamber is formed, the oil chamber is opened to the outer surface of the case cover and the opening is closed by a removable plug, while the case cover is drilled from the inner wall of the oil chamber and introduced. An oil passage structure for an engine, characterized in that a side oil passage and a discharge side oil passage are respectively formed, and a jet plug is fitted to an opening end of the oil passage on the oil chamber side.