JPS61140669A - Lubricating device - Google Patents

Abstract

PURPOSE:To achieve positive lubrication by means of a simple structure by injecting oil through a nozzle for the supply of oil when oil in an oil passage opening in a crank web is supplied to an oil passage opening in the other crank web. CONSTITUTION:A crank web 28a has an oil supply passage 27a extending through a crank shaft 4, and an oil injecting nozzle 34 is provided at the opening end thereof. The other crank web 28b has an oil passage 27b communicating to starter gears 14, 18a, 18b and others which has an opening at a position opposite to the nozzle. Thus constructed, oil injected by the nozzle is positively supplied to the oil passage communicating to the starter gears and others, and furthermore, it is not necessary to machine complicate oil passages in the crank member.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an engine lubricating device suitable for, for example, lubrication of a starter gear homo portion of a four-stroke engine.

[Technical background of the invention and its problems]

The starter gear boss portion of a small displacement vehicle is normally lubricated at atmosphere, but since there is a limit to the amount of oil supplied, there is a tendency for lubrication to become insufficient as the load increases. In particular, when a variable mass is attached to the outer periphery of the starter gear boss, the sliding part has an overlapping structure, and the T:i sliding condition of the bearing part becomes even worse.

On the other hand, there is also one in which lubricating oil is forced to be fed from one end to the other end through an oil passage formed in the axial center of the crankshaft. In this type, the oil passages are arranged opposite between the crank webs, and the lubricating oil pumped from one end of the crankshaft is distributed in a droplet state between the crank webs on the other end, and the lubricating oil is passed through the crank webs on the other end. , for example, to the starter gear boss.

However, lubricating oil tends to fall in the gap between the crank webs and the amount of lubricating oil supplied to the starter gear boss side tends to decrease.

In addition, in metal crank cars, etc., a special A° oil flow path is formed in the metal part to guide A1 lubricant, but in this case, the configuration is complicated, the manufacturing time is increased, and the cost is 1 to 1.
There are also problems such as higher prices.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and is capable of sufficiently supplying lubricating oil from one end of the crankshaft to the other end across the crank webs.
! A lubricating part on the end side, such as a starter? To provide an A1 sliding device for an engine that can reliably perform necessary lubrication of a boss part, etc., with a simple configuration without the need to provide a special oil flow path or the like.

(Summary of the Invention) In order to achieve the above object, the present invention has oil passages formed in the axial center of the crankshaft facing each other between crank webs, and lubricating oil pumped from one end of the crankshaft to the crankshaft. In the lubricating device in which the gap between the heta-rank webs on the other end side is made Q and the lubricating oil is not supplied, a nozzle for injecting lubricating oil into the oil passage on the supplied side is provided at the opening part of the crank web of the oil passage on the lubricating oil supply side. It is characterized by:

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

The figure shows the unfolded state of the crankshaft portion of a small displacement four-cycle engine, in which a crankshaft 4 is supported by a crankcase 3 covered with a mission case 1 and a cover 2 via bearings 5 and 6.

The crankshaft 4 has a connecting rod large end 7 connected to a crank pin 8.
A balance shaft 11 is also connected through a balance drive gear 9 and a balance driven gear 10. One end side of the crankshaft 4 (R crankshaft) 4a
Primary drive gear 12, chain block I
・13 etc. are attached, and the other end side of the crankshaft 4 (
A starter driven gear 14 is attached to the L crankshaft 4b via a roller bearing 15. Starter driven gear 14 transmits rotation to L crankshaft 4b via one-way clutch 16 and holder 17.

This starter driven gear 14 is connected to a starter motor 19 via a starter drive idle gear 18a1 and a starter idle gear 18b. Further, a variable mass 21 is provided on the outer circumferential side of the boss portion 14a of the starter driven gear 14 via a roller bearing 20, and this variable mass 21 is connected to a centrifugal shor holder 22 which rotates integrally with this when the crankshaft 4b rotates at high speed. It is connected to the centrifugal holder 23 to effect weight balance.

In addition, 24 is a generator rotor, 25.26 is a rotor 24
The coil and stator are opposite to each other.

c at the center of the R crankshaft 4a and the R crankshaft 4b.
, a tire passage 27a and an L-side oil passage 27b, which are connected to the crankshaft nib 28a,
They face each other in the gap between 28b. The upstream end of the R-side oil passage 27a is an oil introduction passage 30 connected to the electromagnetic oil pump 29 provided in the transmission case 1.
I am coming through this. This R side oil passage 28a communicates with a hollow hole 32 of the crank bin 8 via a communication passage 31 branched at the other end, and further, the hollow hole 32 is connected to a small diameter passage 33.
It communicates with the connecting rod vibrating section 7a.

Note that the openings at both ends of the hollow hole 32 are closed with plugs 32a. A nozzle 34 is provided at the other end of the R-side oil passage 27a, that is, at the outlet end located at the crank web 28a. This nozzle 34 injects lubricating oil toward the L-side oil passage 27b, and is constituted by a member separate from the R-side oil passage 4a, for example, and is inserted into the R-side oil passage 7a.

On the other hand, the L side oil passage 27b is a hole that opens on the crank web 28b side of the crankshaft 4b and reaches inside the L crankshaft 4b. 14 boss part 1
It communicates with a roller bearing 15 that supports the roller bearing 4a. Further, the roller bearing 15 is in communication with the roller bearing 20 that supports the variable mass 21 through a small hole 3-6 formed in the boss portion 14a of the starter driven gear 14. This L-side oil passage 27b has a larger diameter than the R-side oil passage 27a, and has a spiral groove 37 carved on its inner circumferential surface that allows lubricating oil to advance from the open end to the inner end by inertia when the crankshaft rotates. It is set up. In other words, this spiral groove 37 is shaped to face from the open end side to the inner end side and progress in a direction opposite to the direction of rotation of the crankshaft. The open end of the L-side oil passage 27b has a tapered portion 38 whose diameter gradually increases on the end side, thereby increasing the receiving area of the lubricating oil injected from the nozzle 34 of the R-side oil passage 27a. There is.

When the crankshaft 4 rotates, the electromagnetic oil pump 29 is activated, and as shown by the arrow in the figure, the lubricating oil flows from the oil introduction path 30 into the R-side oil passage 27a, and further into the R-side oil passage 7a. It flows inside from one end to the other end. A part of the lubricating oil is supplied to the connecting rod sliding portion through the communication passage 31 and the small diameter passage 33 due to the centrifugal force caused by the rotation of the R crankshaft 4a, and the other part is supplied from the nozzle 34 toward the L side oil passage 27b. is injected. A large amount of the injected lubricating oil reaches the L-side oil passage 27b due to the injection force. That is, the amount of lubricating oil falling in the gap between the crank webs 28a and 28b is reduced by the injection from the nozzle 34,
The lubricating oil is efficiently supplied from the R side oil passage 27a to the mustard side oil passage 27b.

Moreover, since the open end of the L-side oil passage 27b that receives the lubricating oil from the nozzle 34 is opened in a trumpet shape by the tapered portion 38, the amount of lubricating oil received increases by the opening area. With this, the crank webs 28a, 28b
The efficiency of supplying lubricating oil between r and r is improved.

Further, in the [side oil passage 27b], lubricating oil is actively fed toward the inner end side along the spiral groove 37 formed on the inner circumferential surface thereof by the inertia caused by the rotation of the L crankshaft 4b. Therefore, the communication hole 35 on the inner end side of the L side oil passage 27b
In turn, a large amount of lubricating oil is supplied to the small hole 36 of the boss portion 14a of the starter driven gear 14, and the roller bearing 15. of the starter driven gear 14 and the variable mass 21.
20 is sufficiently lubricated, and seizing and the like can be reliably prevented.

In addition, since such highly efficient lubrication can be achieved with a simple construction by machining the oil passage of the crankshaft 4, there is an advantage that no particularly troublesome machining is required and it can be easily and inexpensively manufactured.

In the embodiment, the spiral groove 37 is formed in the L-side oil passage 27b, but if the lubricating oil is sufficiently supplied to the L-side oil passage 27b only by the injection action from the nozzle 34 and advances, the spiral groove 37 and the like are formed in the L-side oil passage 27b. A configuration may be adopted in which the groove 37 and the like are omitted.

[Effects of the Invention] As described above, according to the lubricating device according to the present invention, since the nozzle for injecting lubricating oil into the oil passage on the supplied side is provided at the crank web opening portion of the oil passage on the lubricating oil supply side,
The loss of lubricating oil that conventionally occurred between the crank webs has been reduced, and the necessary A71 lubricating oil can be supplied to the oil passage on the supplied side and the starter gear that communicates with it. To effectively deal with load expansion, and to achieve effects such as easy configuration and low cost implementation.

[Brief explanation of drawings]

The drawing is a developed view showing an embodiment of the f4 sliding device according to the present invention. 4 (4a, 4b)...Crankshaft, 27a, 27b.
...Oil passage, 28...Crank web, 34...
- Nozzle, 37... spiral groove.

Claims (1)

[Claims] 1. Oil passages opened in the axial center of the crankshaft are opposed between the crank webs, and lubricating oil is pumped from one end of the crankshaft to the other end of the crankshaft between the crank webs. A lubricating device configured to supply lubricating oil over the entire range, characterized in that a nozzle for injecting lubricating oil into an oil passage on a supplied side is provided at a crank web opening portion of the oil passage on the lubricating oil supply side. . 2. The lubricating device according to claim 1, wherein the oil passage opened in the crankshaft on the side to which the lubricating oil is supplied has a spiral groove formed on its inner circumferential surface to guide the lubricating oil by inertia.