JP3216006B2 - Engine lubrication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine lubrication device, and more particularly to an engine lubrication device capable of promoting lubrication of a timing gear driven by a crank gear of the engine.

[0002]

2. Description of the Related Art Conventionally, as a lubricating device for an engine, a method of pumping oil through an oil filter to each part of the engine by an oil pump has been most widely adopted. In such a pressure-feed lubrication device, a method of lubricating a timing gear by ejecting oil supplied from a main oil passage from an oil nozzle provided near a position where the timing gear is provided is known.

[0003]

However, the above-mentioned oil nozzle type lubricating apparatus has the following problems. (1) It is necessary to guide a part of the main oil passage to the front of the crankcase where the timing gear is provided, and it is necessary to dispose an oil nozzle at a position where the timing gear is provided. become. (2) In oil injection by the oil nozzle, sufficient lubrication cannot be performed over a wide range of the timing gear due to low oil pressure. (3) In order to supply sufficient oil to a plurality of meshing positions of the timing gear, it is necessary to provide a plurality of oil nozzles.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an engine lubrication device which can easily lubricate a timing gear with a simple structure.

[0005]

The lubricating device for an engine according to the first aspect of the present invention will be described with reference to FIGS.
A gear case 3 is mounted on the front side of the crankcase 2, an oil pump 4 driven by rotation of the crankshaft 6 is mounted on the gearcase 3, and a crank gear 11 is provided on a crankshaft end protruding from the front surface 2a of the crankcase. An engine lubrication device applied to an engine provided with a timing gear 15 interlockingly driven by a crank gear 11 on a front surface 2a of a crankcase, wherein oil is directed from a high pressure side region in an oil pump 4 to the timing gear 15. An injection hole 34 for jetting is provided in the oil pump wall 28 ,
The oil injected from the injection hole 34 is supplied at a predetermined timing.
It is characterized in that an oil pipe 35 for guiding around the meshing portion of the gear 15 is provided . In addition, as the oil pump wall 28, a pump cover 28 can be exemplified. Examples of the type of the oil pump 4 include a trochoid pump and a gear pump. Further, it is preferable to set the opening area of the injection hole 34 small so that the oil pressure of the oil pump 4 is not significantly reduced by the oil being injected from the injection hole 34.

According to a second aspect of the present invention, there is provided an engine lubrication device, as shown in FIGS.
Attach gear case 3 to this gear case 3
Oil pump 4 driven by rotation of shaft 6
And a crankshaft protruding from the front surface 2a of the crankcase.
A crank gear 11 is provided at the end, and the crank gear 11
The timing gear 15 driven in conjunction with the crankcase
Engine lubrication applied to the engine provided on the front surface 2a
A device which is connected to the oil pump 4
The injection hole 34 for injecting oil toward the
Provided the oil pump wall 28, the timing gear 15 has at least one idle gear 16, 17, characterized in that the oil is supplied to the meshing portion around the position of the idle gear 16, 17. The lubricating device for an engine according to claim 3 is, for example, a crankcase as shown in FIGS.
Attach the gear case 3 to the front side of the case 2
Oil pump driven by rotation of crankshaft 6
And attach it to the front of the crankcase 2a.
A crank gear 11 is provided at the end of the crankshaft.
Click the timing gear 15 which is driven by the gear 11
Energy applied to the engine provided on the front surface 2a of the rank case
A lubrication device for the engine, the high pressure side of the oil pump 4
Inject oil from the region toward the timing gear 15
The injection hole 34 provided in the oil pump wall 28, the timing
Gear 15 has two idle gears 16 and 17,
Of the first idle gear 16 and the second idle gear 17
It is supplied to the peripheral position of the intermeshing portion .

[0007]

According to the first aspect of the present invention, the injection hole for injecting oil from the high pressure side region in the oil pump toward the timing gear is provided in the oil pump wall.
High-pressure oil generated by the oil pump 4 can be injected toward the timing gear 15. By injecting oil with a high pressure, the scattering of the oil becomes large, and lubrication can be performed in a wide range. At the same time, atomization of the oil is promoted by the high pressure, and the lubrication performance can be improved. In addition, the jet
Oil is guided around the meshing portion of the predetermined timing gear 15.
Since the oil pipe 35 is provided, special lubrication is required.
Supply oil concentrated on the fixed timing gear 15
Can be.

According to the invention of claim 2 , the idle gear 1
Since the gears 6 and 17 are provided to transmit the power of the crank gear 11 to the separated timing gear 15, the oil is supplied to the vicinity of the meshing portion of the idle gear 15 so that the oil can be supplied to many of the timing gears 15. Oil can be supplied efficiently. According to the third aspect of the present invention, the first idle gear 16 and the second idle gear
17 because it is supplied to the position around the meshing section between
Oil can be efficiently circulated over the entire gear 15
You.

[0009]

As described in the above operation, the first aspect of the present invention has the following specific effects. (A) Since the oil in the oil pump having a high oil pressure can be supplied to the timing gear, the lubrication performance of the timing gear can be improved by scattering and atomizing the oil. (B) Since the present invention can be implemented simply by providing an injection hole in the wall of the oil pump, it is simpler and can be implemented at lower cost than the conventional configuration. (C) Focus especially on timing gears that require sufficient lubrication
To supply oil.

[0010] According to the second aspect of the present invention, the oil is supplied to the vicinity of the meshing portion of the idle gear, which has a unique effect that the oil can be supplied to many timing gears well. . According to the third aspect of the present invention , the oil is efficiently circulated through the entire idle gear.
Has the unique effect of being able to

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of an engine lubrication device according to the present invention will be described with reference to the drawings. FIG. 1 is a front view of a vertical diesel engine with a gear case removed, FIG. 2 is an exploded perspective view of a gear case, an inner rotor, an outer rotor, and an oil pump cover.
FIG. 3A is a longitudinal sectional view of a main part of the engine, and FIG. 3B is a schematic sectional view showing the shape of the inner rotor.

This vertical diesel engine 1 is shown in FIG.
As shown in FIG. 2, a gear case 3 is assembled on the front side of the crankcase 2, and a trochoid pump 4
Has been assembled. As shown in FIG. 1, a crankshaft 6, a valve operating camshaft 7, a fuel camshaft 8, and a governor shaft 9 are rotatably mounted on the crankcase 2 so that the shaft ends protrude from the crankcase front surface 2a. , A crank gear 11, a cam gear 12, an injection pump gear 13,
The governor gear 14 is attached. Crank gear 11,
A first idle gear 16 is disposed in a region of the front surface 2a of the crankcase surrounded by the cam gear 12 and the injection pump gear 13 so as to mesh with the crank gear 11, the cam gear 12, and the injection pump gear 13, respectively. .

A second idle gear 17 meshing with both the first idle gear 16 and the governor gear 14 is provided obliquely below the first idle gear 16. The rotation of the crank gear 11 in the direction indicated by the arrow 38 is transmitted to the cam gear 12 and the injection pump gear 13 via the first idle gear 16 to drive the valve mechanism and the fuel injection pump, respectively. The rotation of the crank gear 11 is also transmitted to the governor shaft 9 via the first idle gear 16, the second idle gear 17, and the governor gear 14, and the governor weight (not shown).
To rotate. The crank gear 11, cam gear 12, injection pump gear 13, and governor gear 14 constitute a timing gear 15.

As shown in FIG. 3 (A), the distal end region of the crankshaft 6 has a gear journal 18 for externally fixing the crank gear 11 and a rotor journal 21 for externally fixing the rotor interlocking cylinder 20 of the inner rotor 19. And a pulley fixing portion 2 that penetrates through the gear case 3 and fixes the crank pulley 22.
3 is comprised.

The trochoid pump 4 is configured as follows. As shown in FIG. 3 (A), an annular inner rotor 19 is rotatably fitted in a pump case wall 25 erected at a predetermined lower portion inside the gear case 3, and the inner rotor 19 is fitted in an outer rotor 31. The trochoid pump 4 is constituted by accommodating the inner rotor 19 and the outer rotor 31 with the pump cover 28 having the shaft opening 29 formed therein. A pivot boss 27 is protruded inside a pump case 26 formed by expanding a part of the gear case 3, and the rotor boss 30 derived from the annular inner rotor 19 is connected to the pivot boss 27. The inner rotor 19 is rotatably held by being rotatably fitted in the inner rotor 19. The inner rotor 19 is rotated integrally with the crankshaft 6 by a cylindrical rotor interlocking cylinder 20 fitted and fixed to the outside of the crankshaft 6. The inner peripheral side of the pivot boss 27 is sealed with an annular oil seal 32 so that the gear case 3
To prevent oil from leaking to the outside.

Further, in the high pressure side region in the trochoid pump 4, the first idle gear 16 and the second idle gear 1 are formed by penetrating the injection hole 34 through the pump cover 28.
It is configured such that high-pressure oil can be injected toward the vicinity of the meshing portion between 7. The diameter of the injection hole 34 is 0.1 to 0.4.
The diameter of the trochoid pump 4 can be concentrated and supplied to the periphery of the meshing portion without lowering the supply pressure of the trochoid pump 4. As shown in FIG. 1, considering the rotation directions of the first idle gear 16 and the second idle gear 17 determined by the rotation direction 38 of the crankshaft 11, the rotation between the first idle gear 16 and the second idle gear 17 is considered. By injecting the oil toward the vicinity of the meshing portion, the oil can be efficiently circulated throughout the idle gear 15.

That is, if the oil can be directly supplied to the vicinity of the meshing portion, the injected oil can be supplied to the crank gear 11, the cam gear 12, and the injection pump gear 13 via the first idle gear 16. The oil can be supplied to the governor gear 14 via the second idle gear 17. In addition, by being able to inject high-pressure oil, it is possible to increase the degree of scattering of the oil, promote atomization of the oil, and achieve good lubrication.

The injection hole 34a in FIG.
FIG. 4 is a longitudinal sectional view showing an embodiment in which an injection hole indicated by reference numeral 34a (black circle ●) is provided, wherein oil is injected into a meshing portion between the crank gear 11 and the first idle gear 16; It is. In the configuration in this case, a large amount of oil can be supplied to the crank gear 11 closest to the drive source, and the lubricity of the crank gear 11 can be improved.

[0019]

Second Embodiment FIG. 4 is a view showing a second embodiment of the present invention, and is a front view of a front wall of a crankcase, and is a view corresponding to FIG. The second embodiment is characterized in that the injection holes 34 opened in the pump cover 28 are characteristic in comparison with the first embodiment.
An oil pipe 35 for guiding oil is attached to the oil pipe, and a tip end of the oil pipe 35 is located near a meshing portion where oil supply is particularly desired. In the embodiment shown in FIG. 4, the tip end of the oil pipe 35 is branched into two, one tip end 36a is located near the meshing portion between the first idle gear 16 and the injection pump gear 13, and the other tip end 36b Is located near the meshing portion between the second idle gear 17 and the governor gear 14.

The present invention is not limited to the above-described embodiment, but can be implemented with various modifications within the gist of the present invention. Hereinafter, such an embodiment will be described. (1) In the second embodiment, the configuration of the oil pipes 36 is such that, in addition to the setting of the position of the distal end port of the oil pipe 36 and the setting of whether or not the oil pipe 36 is branched, the thickness of each oil pipe 36 in the branched oil pipe 36 is set. There are different configurations. By changing the thickness in this way, the oil supply ratio of the branched oil pipe can be changed. (2) In the above-described embodiment, the case where the number of the injection holes 34 is one is exemplified. However, if the oil pump pressure does not decrease significantly and the lubrication of each part of the engine can be performed well, a plurality of injection holes are provided. Is also good.

[Brief description of the drawings]

FIG. 1 is a front view of a vertical diesel engine with a gear case removed.

FIG. 2 is an exploded perspective view of a gear case, an inner rotor, an outer rotor, and an oil pump cover.

FIG. 3A is a longitudinal sectional view of a main part of an engine, and FIG.
(B) is a schematic sectional view showing the shape of the inner rotor.

FIG. 4 is a diagram for explaining a second embodiment of the present invention.

[Explanation of symbols]

2 ... crankcase, 2a ... front of crankcase, 3 ...
Gear case, 4 ... Trochoid pump, 6 ... Crankshaft,
11 crank gear, 15 timing gear, 16 first idle gear, 17 second idle gear, 28 pump cover, 34, 34a injection hole, 35 oil pipe.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F01M 1/08 F01M 1/02 F01M 9/10 F02B 67/04

Claims (3)

(57) [Claims] 1. A gear case (3) is mounted on the front side of a crankcase (2), and an oil pump (4) driven by rotation of a crankshaft (6) is mounted on the gearcase (3). The present invention is applied to an engine in which a crank gear (11) is provided at an end of a crankshaft protruding from (2a), and a timing gear (15) driven by the crank gear (11) is provided on a front surface (2a) of the crankcase. a lubricating device for an engine, the injection hole for injecting the oil toward the timing gear (15) from the high pressure side region of the oil pump (4) in the (34) provided in the oil pump wall (28), said injection holes ( 34) The oil gushing from
An oil pipe (35) for guiding around the meshing portion of the gearing (15).
Only wherein the the engine lubrication system for. 2. A gear case (3) is mounted on a front side of a crankcase (2), and an oil pump (4) driven by rotation of a crankshaft (6) is mounted on the gear case (3). The present invention is applied to an engine in which a crank gear (11) is provided at an end of a crankshaft protruding from (2a), and a timing gear (15) driven by the crank gear (11) is provided on a front surface (2a) of the crankcase. a lubricating device for an engine, provided the injection hole for injecting the oil toward the timing gear (15) from the high pressure side region of the oil pump (4) in the (34) to the oil pump wall (28), said timing gear ( 15) has at least one idle gear (16, 17), and oil is supplied to the idle gear (16, 17) at a position around the meshing portion. Wherein the lubricating system for an engine. 3. A gear case (3) is mounted on a front side of a crankcase (2), and an oil pump (4) driven by rotation of a crankshaft (6) is mounted on the gear case (3). The present invention is applied to an engine in which a crank gear (11) is provided at an end of a crankshaft protruding from (2a), and a timing gear (15) driven by the crank gear (11) is provided on a front surface (2a) of the crankcase. a lubricating device for an engine, provided the injection hole for injecting the oil toward the timing gear (15) from the high pressure side region of the oil pump (4) in the (34) to the oil pump wall (28), said timing gear ( 15) has two idle gears (1
6, 17) and the oil is the first idle gear (16).
At a position around the meshing portion between the first idle gear (17) and the second idle gear (17).
Supplied , the engine lubrication system.