JPH0455209Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a lubricating device for a mechanical autotimer of a diesel engine, and is a technology for simplifying the structure thereof.

<Prior Art> Some lubricating devices for mechanical autotimers in diesel engines have the following basic structure.

For example, as shown in FIG. 1 or FIG. 5, a timer case 7 is provided protruding forward from a gear case 5 of a diesel engine 1, a mechanical auto-timer 10 is provided inside the timer case 7, and the mechanical auto-timer 10 is inserted from behind. A main drive gear 11, an advance angle mechanism 12, and a driven flange 13 are disposed in this order in the forward direction, and the main drive gear 11 is rotatably supported on the rear part 16 of a boss cylinder 15 that projects backward from the driven flange 13. At the same time, the fuel injection camshaft 17 is fitted and fixed, and an oil hole 2 is formed in the middle of the boss cylinder 15.
3 is opened, and the lubricating oil injected into the boss hole 24 in the boss cylinder 15 is supplied to the advance mechanism 12 from the oil hole 23 by centrifugal force.

Conventionally, in the basic structure described above, as a structure for injecting lubricating oil into the boss hole 24, a nozzle 45 is attached to the center of the front end of the timer case 7 as shown in FIG. A part of the lubricating oil that is pumped is blown into the boss hole 24 from a nozzle 45 through an oil guide pipe 46.

The above-mentioned conventional structure is expensive because of the need for drilling holes and labor for assembling the nozzle 45 and the oil guide pipe 46. Furthermore, the amount of lubricating oil supplied to other lubricating parts is reduced by the amount of oil pumped to the mechanical auto timer 10.

The present invention aims to omit the structure for force-feeding lubricating oil to the mechanical autotimer by lubricating the mechanical autotimer using lubricating oil scattered within the gear case.

<Means for Solving the Problems> In order to achieve the above object, the present invention, as shown in FIG. 1, FIG. 3, and FIG. An oil guide means 28 for guiding oil to the center of the front wall inner surface 27 of the timer case 7 is provided across the peripheral wall inner surface 26 and the front wall inner surface 27, and this oil guide means 28 is provided in the rotation direction R of the mechanical auto timer 10. A lubricating tool 33, which is composed of a turning convex strip twisted in the same direction as that of FIG. It is characterized by being constructed by projecting into the boss hole 24 from above.

<Operation> According to the present invention, the lubricating oil scattered within the gear case 5 is transferred to the mechanical auto timer 1 as follows.
0 to the advance angle mechanism 12.

Inside the gear case 5, a large amount of lubricating oil is scattered from the gear set and other moving parts, adheres to the inner surfaces of the gear case 5 and the timer case 7, and flows along the wall surface.

Of this flowing lubricating oil, the lubricating oil that has flowed from the inner surface of the gear case 5 to the inner surface 26 of the circumferential wall of the timer case 7, or that has adhered to the inner surface 26 of the circumferential wall and the inner surface 27 of the front wall, flows vigorously, as shown in FIG. As shown by arrow A in FIG. 3, the oil is guided to the oil filling tool 33 by the oil guiding means 28.

Furthermore, the lubricating oil that has flowed as described above,
Due to the rotational wind generated in the timer case 7 due to the high speed rotation of the mechanical auto timer 10, the oil guiding means 2
It is rolled up into the central part of the front wall inner surface 27 along the turning protrusion 8, and its flow is promoted.

This lubricating oil is injected into the boss hole 24 via the oil filler 33, and is supplied from the oil hole 23 to the advance mechanism 12 by centrifugal force.

<Example> Hereinafter, an example of this invention will be described with reference to FIGS. 1 to 4.

In FIG. 2, reference numeral 1 indicates a vertical diesel engine, reference numeral 2 indicates its crankcase, and arrow Fr in the figure indicates the front side of this diesel engine 1. A plurality of fuel injection pumps 3 are attached to the front portion of the crankcase 2, and a gear case 5 is also provided.

As shown in FIGS. 1 and 2, a cylindrical timer case 7 projects forward from the gear case 5. A gear set (not shown) is housed in the gear case 5. On the other hand, in the timer case 7, a mechanical auto-timer 10 (hereinafter simply referred to as a timer) is provided which adjusts the fuel injection timing in accordance with the rotation speed of the diesel engine 1.

The above-mentioned timer 10 is a known one, and consists of a main drive gear 11 arranged in order from the back to the front;
It is composed of an advance angle mechanism 12 and a driven flange 13.

The boss cylinder 1 is directed backward from the driven flange 13.
5 is provided in a protruding manner, and a main drive gear 11 is rotatably externally supported on the rear part 16 of this boss cylinder 15. The output side of the gear set (not shown) is meshed with this main drive gear 11 . In addition, in the rear part 16 of the same,
A fuel injection camshaft 17 is fitted and fixed via a key 18 and a nut 19. This fuel injection camshaft 17
has a fuel injection cam 20 that drives the fuel injection pump 3, and is supported by the crankcase 2 via a bearing 21. In the figure, a two-dot chain arrow R indicates the rotation direction of the timer 10 and the fuel injection camshaft 17.

Further, an oil hole 23 for lubricating the inside of the advance angle mechanism 12 is formed in the middle of the boss cylinder 15 . and,
The lubricating oil injected into the boss hole 24 in the boss tube 15 is moved from the oil hole 23 to the advance mechanism 1 by centrifugal force.
It is said that it can be supplied to 2.

In the above configuration, so that the lubricating oil scattered within the gear case 5 can be injected into the boss hole 24,
Timer case 7 is configured as follows.

The timer case 7 has a draft for casting, and is formed to narrow toward the front. Lubricant oil splashed from a gear set (not shown) housed in the gear case 5 adheres to the inner surface 26 of the peripheral wall and the inner surface 27 of the front wall. An oil guiding means 28 for guiding this lubricating oil to the central part of the front wall inner surface 27 of the timer case 7 is connected to the peripheral wall inner surface 26 and the front wall inner surface 2.
It is set up over 7 parts.

That is, as shown in FIGS. 1, 3, and 4, the oil guiding means 28 is constituted by a turning protrusion that twists in the same direction as the rotation direction R of the timer 10. These turning protrusions include a plurality of circumferential wall turning protrusions formed at approximately equal intervals in the circumferential direction of the inner surface of the peripheral wall 26 and extending in the front-rear direction, and a plurality of circumferential wall turning protrusions extending from the center of the front wall inner surface 27 toward the front ends of these circumferential wall turning protrusions 29. It has a front wall turning protrusion 30 formed therein. In this case, since the timer case 7 is provided with a draft angle, the upper part of the circumferential wall turning protrusions 29 is slightly inclined downwardly toward the front.

Furthermore, a circular pouring oil injector 33 , which injects the lubricating oil guided to the center of the front wall inner surface 27 by the oil guide means 28 into the boss hole 24 , is inserted into the boss hole 24 from the center of the front wall inner surface 27 .

In this embodiment, the oil guide means 28 is formed integrally with the timer case 7, but instead of this, another case member is fitted into the timer case 7, and the above-mentioned inner surface of this case member is fitted. Oil guiding means 28 may also be formed.

<Effects of the invention> Since the present invention is constructed and operates as described above, it has the following effects.

B. The advance mechanism of the mechanical auto timer is lubricated by using a portion of the lubricating oil flowing along the wall inside the gear case, eliminating the need to forcefully feed lubricating oil and simplifying the structure for lubrication. can be used to reduce manufacturing costs.

(b) A part of the lubricating oil that has been scattered inside the gear case and jumped into the timer case flows vigorously along the inner surface of the circumferential wall and the inner surface of the front wall of the timer case, and is guided to the oil supply tool by the oil guide means. . Furthermore, the lubricating oil that has flowed as described above is drawn into the center of the inner surface of the front wall by the rotating wind generated by the mechanical auto-timer within the timer case, and its flow is promoted.

As a result, a large amount of lubricating oil is supplied to the boss hole, and the advance mechanism can be strongly lubricated to maintain good responsiveness and durability.

(c) Since lubricating oil does not need to be force-fed to the mechanical autotimer, the amount of oil supplied to other lubricating parts increases, and the lubricating performance thereof can be improved.

[Brief explanation of the drawing]

1 to 4 show an embodiment of this invention, in which FIG. 1 shows a vertical section of a mechanical autotimer, and FIG. 3 is a sectional view taken along the - line in FIG. 1, and FIG. 4 is a sectional view taken along the - line in FIG.
FIG. 5 shows a conventional example and is a diagram corresponding to FIG. 1. 1... Diesel engine, 5... Gear case, 7... Timer case, 10... Mechanical auto timer, 11... Main drive gear, 12... Advance angle mechanism, 13... Driven flange, 15... Boss tube, 1
6...Rear, 17...Fuel injection camshaft, 23...
Oil hole, 24...Boss hole, 26...Inner surface of peripheral wall, 27
... Inner surface of front wall, 28 ... Oil guide means, 33 ... Oil supply tool, R ... Rotation direction.

Claims (1)

[Scope of utility model registration request] A timer case 7 is protruded forward from the gear case 5 of the diesel engine 1, and a mechanical auto-timer 10 is provided inside the timer case 7. The mechanical auto-timer 10 is connected to a main drive gear 11 and an advance angle mechanism 12 in order from the back to the front. and driven flange 1
3, the main drive gear 11 is rotatably fitted and supported on the rear part 16 of the boss cylinder 15 which projects backward from the driven flange 13, and the fuel injection camshaft 17 is fitted and fixed therein. A mechanical auto for a diesel engine is configured such that an oil hole 23 is formed in the middle of the boss cylinder 15 and lubricating oil injected into a boss hole 24 in a boss tube 15 is supplied from the oil hole 23 to an advance mechanism 12 by centrifugal force. In the timer lubricating device, an oil guide means 28 for guiding lubricating oil adhering to the inner surface 26 of the peripheral wall of the timer case 7 to the center of the inner surface 27 of the front wall of the timer case 7 is connected to the inner surface 26 of the peripheral wall.
and the front wall inner surface 27, and this oil guide means 28 is provided in the rotation direction R of the mechanical auto timer 10.
A lubricating tool 33, which is composed of a turning convex strip twisted in the same direction as that of FIG. A lubrication device for a mechanical autotimer of a diesel engine, characterized in that it is inserted into a boss hole 24 from a lubrication device.