JPH11294191A - Timer lubricating device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a timer lubricating device for an engine capable of enhancing the oil feeding efficiency of lubricating oil to be introduced into a timer with a simple constitution. SOLUTION: The boss part 16 of a timer hub 15 is provided with an opening 18 communicated with a oil feeding hole 40 at one end, and a taper hole 17 with the camshaft 5 of a fuel injection pump taper fitted on the other end. In the opening 18, an oil passage 45 is formed on the opposite side of the camshaft of the boss part 16. In the nearly central part of the boss part 16, an oil feeding hole 50 for communicating the opening 18 with the outer circumference of the boss part 16 is formed. The camshaft 5 and the timer hub 15 are connected by a nut 20, and a conical inclined-face 22 is formed on the end surface 21 of the nut 20 on the opposite side of the camshaft. Thus, the lubricating oil to be fed to the oil passage 45 via the opening 18 from the oil feeding hole 40 is prevented from impinging forcibly onto the end surface 21, so that the lubricating oil can be prevented from dropping into the clearance between the engine block 1 and the time hub 15 through the opening 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine (hereinafter referred to as "internal combustion engine").
The present invention relates to a lubricating device for an engine timer lubricated with lubricating oil of an "internal combustion engine".

[0002]

2. Description of the Related Art Conventionally, as an engine timer, an open-type engine timer built in an engine gear case and lubricated by an engine lubricant has been known. As a device, a lubricating device for an engine timer disclosed in Japanese Utility Model Publication No. 4-55210 has been proposed.

[0003]

In the conventional lubricating device for an engine timer described above, the structure for pumping lubricating oil to the timer is omitted, and the structure for lubrication is simplified. However, recently, EGR (exhaust gas recirculation)
Since the capacity of the compressor or the like tends to be increased due to the installation of the device, the lubricating oil supplied to the EGR device or the compressor increases, and accordingly, the lubricating oil supplied to the timer tends to decrease. is there. On the other hand, it is necessary to supply a large amount of lubricating oil to the inside of the timer in order to stabilize the timer characteristics such as the fuel injection timing, improve the wear resistance of the timer, and improve the durability of the timer.

However, in the lubricating device for an engine timer disclosed in Japanese Utility Model Publication No. 4-55210, the amount of lubricating oil introduced into the timer is reduced by the amount of lubricating oil supplied from the engine to the timer. And the lubricating oil supply efficiency is low. The present invention has been made to solve such a problem, and provides a lubricating device for an engine timer capable of improving the efficiency of supplying lubricating oil introduced into the timer with a simple configuration. With the goal.

[0005]

According to a first aspect of the present invention, there is provided a lubricating apparatus for an engine timer, wherein the nut is provided in a boss portion of a timer hub and connects a cam shaft of a fuel injection pump to the timer hub. The end face on the shaft side has an inclined surface, and the boss portion has an opening forming a passage for lubricating oil on the opposite side of the camshaft, and the opening and the outer wall surface of the boss portion near the advance angle mechanism. And a refueling hole communicating therewith. For this reason,
The lubricating oil supplied from the engine can be prevented from vigorously colliding with the end surface of the nut on the side opposite to the camshaft via the opening of the boss portion, and the lubricating oil is prevented from dropping from the opening. be able to. Thus, the lubricating oil supplied to the opening is efficiently introduced into the oil supply hole and supplied to the advance mechanism. Therefore, it is possible to improve the lubrication efficiency of the lubricating oil introduced into the timer with a simple configuration.

According to the lubricating device for an engine timer of the present invention, the boss portion of the timer hub has an opening for forming a passage for lubricating oil on the side opposite to the camshaft, and the opening and the advance mechanism. A lubrication hole communicating with the outer wall surface of the nearby boss,
And an oil reservoir formed on the inner wall surface of the boss near the oil supply hole. Therefore, a predetermined amount of the lubricating oil supplied from the engine is stored in the oil reservoir via the opening of the boss portion, so that the lubricating oil can be prevented from dropping from the opening. Thus, the lubricating oil supplied to the opening is efficiently introduced into the oil supply hole and supplied to the advance mechanism. Therefore, it is possible to improve the lubrication efficiency of the lubricating oil introduced into the timer with a simple configuration.

According to the lubricating device for an engine timer according to the third aspect of the present invention, the end face on the side opposite to the camshaft of the nut provided in the boss portion of the timer hub and connecting the camshaft of the fuel injection pump and the timer hub is inclined. Surface, and the boss portion has an opening forming a passage for lubricating oil on the side opposite to the camshaft;
An oil supply hole communicating the opening with the outer wall surface of the boss near the advance mechanism is provided, and an oil reservoir formed on the inner wall surface of the boss near the oil supply hole. For this reason, it is possible to prevent the lubricating oil supplied from the engine from vigorously colliding with the end surface of the nut on the side opposite to the camshaft via the opening of the boss portion, and furthermore, a predetermined amount of oil is accumulated in the oil sump. The stored lubricating oil can be prevented from dropping from the opening. Thus, the lubricating oil supplied to the opening is more efficiently introduced into the oil supply hole and supplied to the advance mechanism. Therefore, the supply efficiency of the lubricating oil introduced into the timer can be further improved with a simple configuration.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. (First Embodiment) A lubricating device for an engine timer according to a first embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 2, an engine drive gear 4
A timer 10 is provided between the fuel injection pump and the pump main body 3. The timer 10 controls the engine speed in order to use the engine in the best combustion state.
It functions to adjust the fuel injection timing of the fuel injection pump. The timer 10 is an open-type engine timer incorporated in the gear case 2 and the timer gear 11 is driven by the drive gear 4 and lubricated by the engine lubricant.

As shown in FIG. 1, the timer 10 includes a timer gear 11, a timer hub 15, and an advance mechanism 30. An oil passage 35 is provided inside the engine block 1.
And a lubrication hole 40 are formed, and lubrication oil for the engine is supplied from the lubrication hole 40 to the inside of the timer 10 via the oil passage 35. The timer gear 11 is
It meshes with the drive gear 4 shown in FIG. 2 and rotates in synchronization with the engine.

The timer hub 15 has a cylindrical boss 16 for rotatably supporting the timer gear 11, and a boss 16.
And a disk-shaped flange portion 19 formed on the outer periphery of the disk. The boss 16 has one end rotatably supported by the engine block 1 via the bearing 12. Therefore, the timer gear 11 and the timer hub 15 are relatively rotated and displaced.

The boss portion 16 faces the oil supply hole 40 of the engine block 1, and the engine block 1 and the timer hub 15
Has an opening 18 communicating with the oil supply hole 40 through a gap between the fuel injection pump and one end, and has a tapered hole 17 at the other end into which the camshaft 5 of the fuel injection pump is taperedly fitted. Opening 18
Defines an oil passage 45 on the side of the boss 16 opposite to the camshaft. At approximately the center of the boss portion 16, two oil supply holes 5 are provided to connect the inner wall surface and the outer wall surface of the boss portion 16 obliquely in the axial direction.
0 is formed. The oil supply hole 50 communicates the opening 18 with the outer wall surface of the boss 16. Therefore, the lubricating oil supplied from the oil supply hole 40 is supplied to the opening 18 and the oil passage 45.
And it is configured to be introduced into the outer periphery of the boss portion 16 via the oil supply hole 50. Since the central axis of the opening 18 is located below the central axis of the oil supply hole 40 in the vertical direction of gravity, it is possible to reduce the amount of lubricating oil flowing down into the gap between the engine block 1 and the timer hub 15. .

The cam shaft 5 and the timer hub 15 are connected to a boss 16
Are connected to each other by a nut 20 provided therein, and rotate integrally with each other. A conical inclined surface 22 is formed on an end surface 21 of the nut 20 on the side opposite to the camshaft. Therefore, the lubricating oil supplied from the oil supply hole 40 to the oil passage 45 via the opening 18 can be prevented from violently colliding with the end face 21 even at high temperature and high rotation.

An advance mechanism 30 is provided on the outer periphery of the boss 16, and the advance mechanism 30 is covered by a cover 25. The advancing mechanism 30 includes two large eccentric cams 31, two small eccentric cams 32, two gear pins (not shown),
It comprises a weight pin 34 and a pair of weights 33. In FIG. 1, only one large eccentric cam 31, one small eccentric cam 32, and one weight pin 34 are shown.

The two large eccentric cams 31
Are rotatably fitted in holes formed in symmetrical positions eccentric to each other. Inside the large eccentric cam 31, two small eccentric cams 32 are rotatably fitted into holes formed at symmetrical positions eccentric to each other. Small eccentric cam 3
The gear pin 2 is fitted with a gear pin at an eccentric position, and the protruding end of the gear pin is fitted into the timer gear 11. Also,
A weight pin 34 is connected to the eccentric position of the large eccentric cam 31, and the protruding end of the weight pin 34
3 and is slidably inserted into the cover 25 via a bush 26. The bush 26 is movable so that the range in which the weight pin 34 is moved by the rotation of the large eccentric cam 31 is not restricted. Therefore, the rotation of the timer gear 11 is controlled by the small eccentric cam 3 via the gear pin.
2 and the flange portion 19 through the large eccentric cam 31.
, The timer hub 15 is rotated, and the rotation of the timer hub 15 is transmitted to the camshaft 5.

In a space surrounded by the cover 25 and the timer hub 15, a pair of semi-doughnut-shaped weights 33 are arranged so as to face the outer peripheral wall of the boss 16.
The weight 33 is displaced in the radial direction due to an increase in centrifugal force based on an increase in the rotation speed. In this case, a pair of weights 3
3 move linearly in a direction of coming and coming from each other while maintaining a substantially parallel state. The weight pin 34 connected to the eccentric position of the large eccentric cam 31 penetrates the weight 33, and when the weight 33 is displaced in the radial direction by centrifugal force, this displacement will be transmitted to the large eccentric cam 31 through the weight pin 34. It has become. Then, the large eccentric cam 31 is rotated, and the small eccentric cam 32 is rotated by the rotation of the large eccentric cam 31. The rotation of the small eccentric cam 32 is transmitted to the timer gear 11 via the gear pin, and the timer gear 11 and the flange 19 are relatively angularly displaced, and the timer hub 15 is advanced with respect to the timer gear 11.

Next, the flow of the lubricating oil supplied to the timer 10 having the above configuration will be described with reference to FIG. As shown by the arrow in FIG. 1, the lubricating oil supplied from the supply hole 40 through the oil passage 35 in the engine block 1 is supplied through the gap between the engine block 1 and the timer hub 15 and through the opening 18. It is introduced into the passage 45. The lubricating oil is introduced into the oil supply hole 50 and supplied to the advance mechanism 30 without vigorously colliding with the end face 21 of the nut 20 even at high temperature and high rotation.

Next, an inclined surface 22 is attached to the end surface 21 of the nut 20.
A comparative example in which is not formed will be described with reference to FIG.
As shown in FIG. 5, in the comparative example, the cam shaft 5 and the timer hub 15 are connected to a nut 6 provided inside the boss portion 16.
0 and rotate integrally with each other. The end surface 61 of the nut 60 on the side opposite to the camshaft has a planar shape. In other respects, the configuration is the same as that of the first embodiment shown in FIG. 1, and the substantially same parts as those of the first embodiment are denoted by the same reference numerals. The flow of the lubricating oil at the time of low temperature and low rotation of the comparative example is indicated by a dotted arrow in FIG.
Are indicated by solid arrows.

As shown by the dotted arrow in FIG. 5, at the time of low temperature and low rotation of the comparative example, the central axis of the opening 18 is located below the central axis of the oil supply hole 40 in the vertical direction of gravity. Thus, the amount of lubricating oil flowing down into the gap between the engine block 1 and the timer hub 15 can be reduced. However, at the time of high temperature and high rotation, the lubricating oil supplied from the supply hole 40 to the oil passage 45 via the opening 18 as shown by the solid arrow in FIG.
Violently, a part of the spring bounces and falls from the opening 18 into the gap between the engine block 1 and the timer hub 15. For this reason, the advancing mechanism 30
The refueling efficiency defined by the ratio of the amount of oil supplied to the supply hole to the amount of oil supplied from the supply hole 40 is relatively low at about 10%.

On the other hand, in the first embodiment, the supply holes 40
The lubricating oil supplied to the oil passage 45 through the opening 18 through the opening 18 has a high temperature and a high rotation speed even when the end face 21 of the nut 20 is rotated.
The lubricating oil can be prevented from dropping into the gap between the engine block 1 and the timer hub 15 from the opening 18. For this reason, the refueling efficiency defined by the ratio of the amount of oil supplied to the advancing mechanism 30 introduced into the oil supply hole 50 and the amount of oil supplied from the supply hole 40 is about 50%, which is compared with the comparative example. Can be higher. Therefore, the timer 10 has a simple configuration.
The efficiency of lubrication of lubricating oil introduced into the inside can be improved.

(Second Embodiment) A lubricating device for an engine timer according to a second embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 3, in the second embodiment, the timer hub 55 has a boss portion 56 and a flange portion 59, and the boss portion 56 includes the engine block 1 and the timer hub 5
Opening 58 that communicates with oil supply hole 40 through a gap with
At one end, and a tapered hole 57 at the other end into which the camshaft 5 of the fuel injection pump is tapered. The opening 58 forms an oil passage 65 on the opposite side of the boss 56 from the camshaft. At approximately the center of the boss portion 56, two oil supply holes 7 are provided to communicate the inner wall surface and the outer wall surface of the boss portion 56 diagonally in the axial direction.
0 is formed. An oil reservoir 71 is formed on the inner wall surface of the boss 56 near the oil supply hole 70. Therefore,
A predetermined amount of the lubricating oil supplied from the supply hole 40 to the oil passage 65 via the opening 58 is stored in the oil reservoir 71. The camshaft 5 and the timer hub 55 are connected by a nut 60 provided inside the boss 56 so that they rotate together. Nut 6
The end surface 61 on the side opposite to the camshaft 0 has a planar shape. In other respects, the configuration is the same as that of the first embodiment shown in FIG. 1, and the substantially same parts as those of the first embodiment are denoted by the same reference numerals.

In the second embodiment, the lubricating oil supplied from the supply hole 40 to the oil passage 65 via the opening 58 is
A predetermined amount is stored in the oil sump 71 and the lubricating oil is
From falling into the gap between the engine block 1 and the timer hub 55. Therefore, the opening 5
The lubricating oil supplied to 8 is efficiently introduced into the oil supply hole 70 and supplied to the advance mechanism 30. Therefore, it is possible to improve the lubrication efficiency of the lubricating oil introduced into the engine timer with a simple configuration.

(Third Embodiment) A lubricating device for an engine timer according to a third embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 4, in the third embodiment, the camshaft 5 and the timer hub 55 are connected by a nut 20 provided inside the boss portion 56, and rotate integrally with each other. A conical inclined surface 22 is formed on an end surface 21 of the nut 20 on the side opposite to the camshaft. Therefore, the lubricating oil introduced from the oil supply hole 40 into the oil passage 65 via the opening 58 can be prevented from vigorously colliding with the end face 21 even at high temperature and high rotation. The other configuration is the same as that of the second embodiment shown in FIG. 3, and the same reference numerals are given to the substantially same parts as the second embodiment.

In the third embodiment, the lubricating oil supplied from the supply hole 40 to the oil passage 65 through the opening 58 collides vigorously with the end face 21 of the nut 20 even at high temperature and high rotation. Further, a predetermined amount is stored in the oil reservoir 71, and the lubricating oil can be prevented from dropping from the opening 58 into the gap between the engine block 1 and the timer hub 55. Therefore, the lubricating oil supplied to the opening 58 is more efficiently introduced into the oil supply hole 70 and supplied to the advance mechanism 30. Therefore, the lubricating oil supply efficiency introduced into the engine timer can be further improved with a simple configuration.

In the embodiments of the present invention described above,
The lubricating device of the present invention was applied to an eccentric cam type timer,
Of course, the lubricating device of the present invention may be applied to a swing type timer.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a lubricating device for an engine timer according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing an engine timer according to the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a lubricating device for an engine timer according to a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a lubricating device for an engine timer according to a third embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a lubricating device for an engine timer according to a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine block 2 Gear case 3 Pump body 5 Camshaft 10 Timer 11 Timer gear 15 Timer hub 16 Boss 17 Tapered hole 18 Opening 19 Flange 20 Nut 21 End face 22 Inclined surface 30 Advance mechanism 40 Oil supply hole 45 Oil passage 50 Oil supply hole 55 Timer Hub 56 Boss 57 Tapered Hole 58 Opening 59 Flange 60 Nut 61 End Face 65 Oil Passage 70 Oil Filling Hole 71 Oil Pool

Claims (3)

[Claims] A timer gear to which a driving force of an internal combustion engine is transmitted, a timer hub having a flange portion and a boss portion to which a cam shaft of a fuel injection pump is fitted; and a camshaft provided in the boss portion, A nut connected to the timer hub and having an inclined surface on an end surface on a side opposite to the camshaft; and an advance mechanism provided on an outer periphery of the boss and relatively angularly displacing the timer hub with respect to the timer gear. The boss has an opening that forms a passage for lubricating oil on the side opposite to the camshaft, and an oil supply hole that communicates the opening with the outer wall surface of the boss near the advance mechanism. Lubrication device for a timer for an internal combustion engine. 2. A timer gear to which a driving force of an internal combustion engine is transmitted, a timer hub having a flange portion and a boss portion to which a cam shaft of a fuel injection pump is fitted, and a timer gear provided on an outer periphery of the boss portion, And an advance mechanism for relatively angularly displacing the timer hub, wherein the boss is an opening forming a passage for lubricating oil on the side opposite to the camshaft, and the opening and the vicinity of the advance mechanism. A lubricating device for an internal combustion engine timer, comprising: a lubrication hole communicating with an outer wall surface of the boss portion; and an oil reservoir formed on an inner wall surface of the boss portion near the lubrication hole. A timer gear to which a driving force of the internal combustion engine is transmitted; a timer hub having a flange portion and a boss portion to which a camshaft of the fuel injection pump is fitted; and a camshaft provided in the boss portion; A nut connected to the timer hub and having an inclined surface on an end surface; and an advance mechanism provided on an outer periphery of the boss portion for angularly displacing the timer hub relative to the timer gear. An opening forming a passage for lubricating oil on the side opposite to the camshaft, a lubrication hole communicating the opening with the outer wall surface of the boss near the advancing mechanism, and a boss near the lubrication hole. A lubricating device for a timer for an internal combustion engine, comprising an oil reservoir formed on an inner wall surface.