JP2013057295A - Bearing device for idle gear of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for an idle gear of an engine, which can spread lubricating oil over the whole rolling bearing.SOLUTION: In the bearing device for the idle gear of the engine, a support shaft 3 is attached to a wall 2 of a cylinder block 1; the rolling bearing 4 is attached to the support shaft 3; the idle gear 6 is attached to an outer ring 5 of the rolling bearing 4; the support shaft 3 includes a lubricating oil pumping passage 7; and the lubricating oil 9 is jetted to the rolling bearing 4 from a lubricating oil jet orifice 8 of the lubricating oil pumping passage 7. An annular lubricating oil guide plate 12 is led out toward the support shaft 3 from an edge 11 of a rim 10 of the idle gear 6, and a lubricating oil feed orifice 8 faces the inside of a lead-out edge 13 of the lubricating oil guide plate 12 so that the lubricating oil 9 jetted from the lubricating oil feed port 8 can be introduced to an inner peripheral surface 15 of the outer ring 5 by being guided by an inner surface 14 of the lubricating oil guide plate 12.

Description

  The present invention relates to a bearing device for an idle gear of an engine, and more particularly to a bearing device for an idle gear of an engine capable of spreading lubricating oil over the entire rolling bearing.

Conventionally, as a bearing device for an engine idle gear, a support shaft is attached to the wall of the cylinder block, a rolling bearing is attached to the support shaft, an idle gear is attached to the outer ring of the rolling bearing, and a lubricating hydraulic pressure feeding passage is provided on the support shaft. In some cases, the lubricating oil is injected from the lubricating oil injection port of the lubricating oil pressure supply passage to the rolling bearing (see, for example, Patent Document 1).
According to this type of bearing device, there is an advantage that the rolling bearing can be lubricated and cooled with lubricating oil.
However, this conventional technique has a problem because it does not have a function of holding the lubricating oil in the bearing.

Japanese Patent Laying-Open No. 2005-264848 (see FIG. 3)

<Problem> The lubricating oil does not roll over the entire bearing.
Since there is no function of holding the lubricating oil in the bearing, the lubricating oil flows out from the rolling bearing in a short time, and the lubricating oil does not roll and spread over the entire bearing.

  An object of the present invention is to provide a bearing device for an idle gear of an engine that can distribute lubricating oil over the entire rolling bearing.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1 (A) (B) or FIG. 3 (A) (B), a support shaft (3) is attached to the wall (2) of the cylinder block (1), and the support shaft (3) rolls. A bearing (4) is attached, an idler gear (6) is attached to the outer ring (5) of the rolling bearing (4), a lubricating hydraulic pressure feed passage (7) is provided on the support shaft (3), and this lubricating hydraulic pressure feed passage (7 In a bearing device for an idle gear of an engine for injecting lubricating oil (9) from a lubricating oil injection port (8)
As illustrated in FIG. 1 (A) (B) or FIG. 3 (A) (B), an annular shape is formed from the edge (11) of the rim (10) of the idle gear (6) toward the support shaft (3). The lubricating oil guide plate (12) is led out, the lubricating oil supply port (8) faces the inside of the leading edge (13) of the lubricating oil guide plate (12), and the lubricating oil supply port (8) An idle gear for an engine, characterized in that the injected lubricating oil (9) can be introduced to the inner peripheral surface (15) of the outer ring (5) by guiding the inner surface (14) of the lubricating oil guide plate (12). Bearing device.

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> Lubricating oil can be supplied to the entire rolling bearing.
As illustrated in FIG. 1 (A) (B) or FIG. 3 (A) (B), an annular shape is formed from the edge (11) of the rim (10) of the idle gear (6) toward the support shaft (3). The lubricating oil guide plate (12) is led out, the lubricating oil supply port (8) faces the inside of the leading edge (13) of the lubricating oil guide plate (12), and the lubricating oil supply port (8) Since the injected lubricating oil (9) can be introduced to the inner peripheral surface (15) of the outer ring (5) by guiding the inner surface (14) of the lubricating oil guide plate (12), the inner peripheral surface of the outer ring (5) The lubricating oil (9) introduced into (15) is rotated along the inner peripheral surface (15) of the outer ring (5) rotating integrally with the idle gear (6) due to its viscosity, and the outer ring is caused by centrifugal force. It is pressed against the inner peripheral surface (15) of (5), the outflow in a short time from the rolling bearing (4) is suppressed, and the lubricating oil (9) can be spread over the entire rolling bearing (4).

(Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> The function of rolling the lubricant over the entire bearing is high.
Since the lubricant guide groove (17) is formed between the lubricant guide plate (12) and the end face (16) of the outer ring (5) as illustrated in FIG. 1 (B) or FIG. 3 (B), The lubricating oil (9) can be held in the lubricating oil holding groove (17) by centrifugal force, and the function of spreading the lubricating oil (9) over the entire rolling bearing (4) is high.

(Invention of Claim 3)
The invention according to claim 3 has the following effect in addition to the effect of the invention according to claim 1 or claim 2.
<Effect> The lubricating oil and the rolling bearing can be cooled.
As illustrated in FIGS. 3A and 3B, since the heat radiating fins 19 are provided on the outer surface 18 of the lubricating oil guide plate 12, the lubricating oil ( 9) and the rolling bearing (4) can be cooled.

(Invention of Claim 4)
The invention according to claim 4 has the following effect in addition to the effect of the invention according to claim 3.
<Effect> The lubrication function of the rolling bearing is enhanced.
As illustrated in FIGS. 3A and 3B, when the idle gear 6 rotates (20), the heat dissipating fin (19) blows air (21) toward the support shaft (3) to support the support shaft (3). And outflow of the lubricating oil (9) which tends to overflow from the gap between the lead-out edge (13) of the lubricating oil guide plate (12) to the opposite side of the rolling bearing (4) can be suppressed by shielding with the blower (21). As a result, the supply amount of the lubricating oil (9) to the rolling bearing (4) increases, and the lubricating function of the rolling bearing (4) is enhanced.

1A and 1B are diagrams illustrating an engine according to a first embodiment of the present invention, in which FIG. 1A is a cross-sectional plan view of an idle gear and a peripheral portion thereof, and FIG. 1B is a portion as viewed from an arrow B in FIG. FIG. 1 is a partially cutaway front view of an engine according to a first embodiment of the present invention. FIG. 3A is a diagram illustrating an engine according to a second embodiment of the present invention, FIG. 3A is a cross-sectional plan view of an idle gear and its peripheral portion, and FIG. 3B is a portion as viewed in the direction of arrow B in FIG. FIG.

  FIG. 1 and FIG. 2 are diagrams for explaining an engine equipped with an idle gear bearing device according to a first embodiment of the present invention. FIG. 3 is a diagram for explaining an engine equipped with an idle gear bearing device according to a second embodiment. In each embodiment, a water-cooled vertical multi-cylinder diesel engine will be described.

A first embodiment will be described.
The outline of this engine is as follows.
As shown in FIG. 2, the cylinder head (22) is assembled to the upper part of the cylinder block (1), the oil pan (23) is assembled to the lower part of the cylinder block (1), and the front of the cylinder block (1) is timed. A transmission gear case (24) is assembled.
A timing transmission gear train (25) is accommodated in the timing transmission gear case (24). The timing transmission gear train (25) meshes the first idle gear (27) with the crank gear (26), and the valve drive cam gear (28) and the second idle gear (6) with the first idle gear (27). The fuel injection cam gear (29) and the power take-off gear (30) are meshed with the second idle gear (6). The rotation direction of each gear is indicated by an arrow in FIG.

  As shown in FIGS. 1 (A) and 1 (B), a support shaft (3) is attached to the wall (2) of the cylinder block (1), and a rolling bearing (4) is attached to the support shaft (3). A second idle gear (6) is attached to the outer ring (5) of (4), a lubricating hydraulic pressure feed passage (7) is provided on the support shaft (3), and a lubricating oil injection port (8) of this lubricating hydraulic pressure feed passage (7) is provided. ) To the rolling bearing (4).

The wall (2) of the cylinder block (1) is the front wall of the cylinder block (1). The rolling bearing (4) is a ball bearing, and a steel ball (40) is disposed between the outer ring (5) and the inner ring (31). The inner ring (31) is fixed to the support shaft (3) by a retaining plate (33) attached to the support shaft (3) with mounting bolts (32), and the outer ring (5) is a second idler by the retaining ring (34). It is fixed to the gear (6).
The oil pressure supply passage (7) is an oil gallery (36) for supplying the lubricating oil (9) of the oil pan (23) to a sliding portion such as a bearing (not shown) of the crankshaft by the oil pump (35). Communicated with. The oil gallery (36) is provided on the wall (2) of the cylinder block (1) and communicates with the lubricating hydraulic pressure feed passage (7) via an annular groove (37) formed in the circumferential direction of the support shaft (3). doing. The lubricating oil pressure supply passage (7) penetrates the support shaft (3) from the annular groove (37), and the lubricating oil injection port (8) of the lubricating oil pressure supply passage (7) is formed on the peripheral surface of the support shaft (3). Open.

As shown in FIGS. 1 (A) and 1 (B), an annular lubricating oil guide plate (12) is led out from the edge (11) of the rim (10) of the idle gear (6) toward the support shaft (3). The lubricating oil supply port (8) faces the inside of the leading edge (13) of the lubricating oil guide plate (12), and the lubricating oil (9) injected from the lubricating oil supply port (8) is used as the lubricating oil. The inner surface (15) of the outer ring (5) can be introduced by guiding the inner surface (14) of the guide plate (12).
The lubricant guide plate (12) is led out from the edge (11) on the cylinder block (1) side of the rim (10) of the idle gear (6). Derived from the end edge (38) on the side opposite to the cylinder block (1) toward the support shaft (3), the lubricating oil supply port (8) is provided inside the leading end edge (13) of the lubricating oil guide plate (12). You may face.

As shown in FIG. 1B, a lubricating oil retaining groove (17) is formed between the lubricating oil guide plate (12) and the end face (16) of the outer ring (5).
The lubricating oil retaining groove (17) is formed in an annular shape between the lubricating oil guide plate (12) and the end surface (16) of the outer ring (5).
The lubricating oil retaining groove (17) is formed between the lubricating oil guide plate (12) and the end face (16) on the cylinder block (1) side of the outer ring (5), but the lubricating oil guide plate (12). Is led out from the edge (38) of the rim (10) of the idle gear (6) on the side opposite to the cylinder block (1) toward the support shaft (3), the lubricant guide plate (12) and the outer ring ( 5) between the end surface (39) on the side opposite to the cylinder block (1).

A second embodiment shown in FIGS. 3A and 3B will be described.
As shown in FIGS. 3 (A) and 3 (B), a heat radiating fin (19) is provided on the outer surface (18) of the lubricating oil guide plate (12), and the heat radiating fin (19) is rotated during rotation (20) of the idle gear (6). Then, air (21) is blown to the support shaft (3) side, and the space between the support shaft (3) and the leading end edge (13) of the lubricating oil guide plate (12) will overflow to the opposite side of the rolling bearing (4). The outflow of the lubricating oil (9) can be suppressed by shielding with the blower (21).
The heat dissipating fins (19) are inclined at a predetermined angle with respect to the tangent line in the rotation (20) direction so as to obtain a blowing function.
Other configurations are the same as those of the first embodiment shown in FIGS. 1A and 1B and FIG. 2, and in FIGS. 3A and 3B, the same elements as those of FIGS. 1A and 1B are used. Are given the same reference numerals.

(1) Cylinder block
(2) Wall
(3) Support shaft
(4) Rolling bearing
(5) Outer ring
(6) Idle gear
(7) Lubricating hydraulic pressure passage
(8) Lubricating oil injection port
(9) Lubricating oil
(10) Rim
(11) Edge
(12) Lubricating oil guide plate
(13) Lead edge
(14) Inside
(15) Inner peripheral surface
(16) End face
(17) Lubricating oil retaining groove
(18) Exterior
(19) Radiation fin
(20) Rotation
(21) Blower

Claims (4)

A support shaft (3) is attached to the wall (2) of the cylinder block (1), a rolling bearing (4) is attached to the support shaft (3), and an idle gear (6) is attached to the outer ring (5) of the rolling bearing (4). ), A lubricating oil pressure supply passage (7) is provided in the support shaft (3), and lubricating oil (9) is injected from the lubricating oil injection port (8) of the lubricating oil pressure supply passage (7) into the rolling bearing (4). In the idle gear bearing device of the engine,
An annular lubricant guide plate (12) is led out from the end edge (11) of the rim (10) of the idle gear (6) toward the support shaft (3), and the lead-out end of this lubricant guide plate (12) The lubricating oil supply port (8) faces the inside of the edge (13), and the lubricating oil (9) injected from the lubricating oil supply port (8) is guided by the inner surface (14) of the lubricating oil guide plate (12). An idle gear bearing device for an engine, characterized in that it can be introduced to the inner peripheral surface (15) of the outer ring (5). In the engine idle gear bearing device according to claim 1,
A bearing device for an idle gear of an engine, wherein a lubricating oil retaining groove (17) is formed between the lubricating oil guide plate (12) and the end face (16) of the outer ring (5). The engine idle gear bearing device according to claim 1 or 2,
A bearing device for an idle gear of an engine, wherein heat radiation fins (19) are provided on an outer surface (18) of the lubricating oil guide plate (12). In the engine idle gear bearing device according to claim 3,
When the idle gear (6) is rotated (20), the radiating fin (19) blows air (21) toward the support shaft (3), and the leading edge (13) of the support shaft (3) and the lubricating oil guide plate (12). The engine idle gear is characterized in that the outflow of the lubricating oil (9), which tends to overflow to the opposite side of the rolling bearing (4) from between the air bearings (4), can be suppressed by shielding with the air blow (21). Bearing device.

Images