JPH0218258Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention is an internal combustion engine in which lubricating oil in an oil pan is sucked up through a rotating suction pipe, and each lubricated part of the engine is sucked up. This invention relates to a revolving type lubricating oil suction device that supplies oil to the lubricating oil suction device.

(2) Prior art Conventionally, as the above-mentioned device, a substantially vertical bearing tube that is housed in an oil pan and connected to a lubricated part of the engine body is fixed to the engine body, and the bearing tube is provided with lubricant stored in the oil pan. A swiveling suction pipe with a suction port immersed in oil is supported so that it can rotate, and lubrication is stored in the oil pan due to rapid acceleration/deceleration of the vehicle, centrifugal force during cornering, or tilting of the engine when driving on a slope. When the oil is biased to one side and the oil level is tilted, the suction pipe is automatically rotated to the tilted side, so that the suction port of the suction pipe is always located in the stored lubricating oil. A device that avoids air being trapped in the oil sucked up from the oil is already known (see, for example, Japanese Utility Model Publication No. 42568/1983).

(3) Problems to be solved by the invention In the above-mentioned known method, the gap between the outer peripheral surface of the bearing sleeve and the inner peripheral surface of the swing suction pipe is always above the surface of the lubricating oil stored in the oil pan. Since it is exposed, it is necessary to strictly seal the gap to prevent air from entering the suction oil through the gap, but a bearing is installed in the gap to support the swiveling suction pipe freely. Because it is interposed, there are the following problems. That is, with the use of the above-mentioned bearing, it is necessary to specially interpose a seal such as a mechanical seal between the bearing cylinder and the swing suction pipe, and as a result, the frictional swing resistance of the swing suction pipe becomes large.
When the turning force applied to the turning suction pipe is weak, it is difficult for the turning suction pipe to turn smoothly and easily in a desired direction.

The number of parts for the seal connection between the bearing bushing and the rotating suction pipe increases, the structure becomes complicated and the cost increases.

Further, in the above-mentioned known device, since the middle of the turning suction pipe is bent in an S-shape, it is relatively bulky in the vertical direction, and the strainer portion at the lower end of the suction pipe is radially moved from the turning axis of the suction pipe. There is also the problem that the displacement range is large in the horizontal direction, and as the effective capacity of the strainer section is relatively small, the range of movement of the strainer section becomes wide, and the overall size of the oil pan becomes correspondingly large.

The present invention was proposed in view of the above circumstances, and provides a simple and compact rotating lubricating oil suction device in which the rotating suction pipe can always turn easily and smoothly to the side where lubricating oil is distributed with less resistance. The purpose is to

B. Structure of the device (1) Means for solving the problems In order to achieve the above object, the present invention fixes to the engine body a substantially vertical bearing cylinder that is housed in the oil pan and is connected to the lubricated part of the engine body. In a swing type lubricating oil suction device for an internal combustion engine, the swing suction pipe is rotatably supported in the bearing sleeve and has a suction port immersed in lubricating oil stored in an oil pan. is formed into a substantially L-shape by a pivot shaft portion rotatably fitted to the inner circumferential surface of the bearing sleeve, and a strainer portion connected to the lower end of the pivot shaft portion and extending substantially horizontally; A plurality of grooves are formed at intervals in the axial direction on either the outer circumferential surface of the pivot shaft portion or the inner circumferential surface of the bearing cylinder, and a labyrinth seal is formed between these surfaces. At least a lower portion of the strainer is located below an oil level of the stored lubricating oil during engine operation, and the suction port is opened at a free end of the strainer portion.

(2) Effect The lubricating oil stored in the oil pan is always retained in at least a portion of the plurality of grooves that form the labyrinth seal on the fitting surface between the inner circumferential surface of the bearing cylinder and the outer circumferential surface of the pivot shaft. Therefore, the friction between the fitting surfaces can be effectively reduced, and the labyrinth seal effect by the labyrinth packing can be enhanced. As a result, the rotating suction pipe can always be rotated smoothly, and even if the lower end of the gap between the fitting surfaces is temporarily exposed above the oil surface due to the slope of the stored lubricating oil, the suction pipe can be rotated smoothly through the gap. Air can be effectively prevented from entering the sucked oil.

Furthermore, since the above-mentioned turning suction pipe is formed into a substantially L-shape by a substantially vertical turning shaft part that fits into the inner peripheral surface of the bearing cylinder and a strainer part connected to the lower end and extending substantially horizontally, In addition to being relatively compact in the vertical direction, it is possible to ensure a long effective radius without causing the strainer section to deviate significantly in the radial direction, that is, in the horizontal direction, from the pivot axis of the suction pipe.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, the device of the present invention is implemented in an internal combustion engine for a vehicle such as an automobile, and as shown in FIG. 3, and lubricating oil is inside this oil pan 2.
Oi is stored. When the engine body E is in its normal position and the engine is not running, the oil level is approximately L ₁
and when the engine is operated, the lubricating oil
Oi is sucked up and the oil level drops to approximately _L2 .

A crankshaft 5 is rotatably supported by the lower surface of the cylinder block 1 and a plurality of bearing caps 4 fixed to the lower surface, and a bridge member 6 extending in the direction of the crankshaft is fixed to the lower surface of the plurality of bearing caps 4. The plurality of bearing caps 4 are fixed together by this bridge member 6. Bridge member 6
A main gear rally 7 is bored in the main gear rally 7, and lubricating oil flowing inside the main gear rally 7 is supplied to each lubricated part of the engine body E from there. Furthermore, a baffle plate 8 is fixed to the lower surface of the bridge member 6 with a plurality of bolts 9.

As shown in FIGS. 1 and 2, a suction passage 10 connected to the suction side of the oil pump P is opened downward toward the oil pan 2 on the lower surface of one end in the axial direction of the cylinder block 1. , the upper end of the fixed suction pipe 11 is fixed with a bolt 12.
The fixed suction pipe 11 is bent into a crank shape when viewed from the side and extends inside the oil pan 2 in the direction of the crankshaft.
Its lower end is opened downward. Fixed suction pipe 11
The flange portion of the substantially vertical bearing tube 13 is located at the lower end of the O
They are integrally connected by a plurality of bolts 15 with a ring 14 in between, and a stay 16 is also fastened to the bridge member 6 using bolts 9 for mounting the buttful plate 8. The free end of the fixed suction pipe 11 is fixedly supported together with the bearing sleeve 13 .

The discharge side of the oil pump P is communicated with the main gear rally 7 via an oil filter (not shown) as usual. Approximately vertical inner circumferential surface 1 of bearing tube 13
8 is a substantially vertical pivot shaft portion 19 ₁ of the pivot suction pipe 19 .
are slidably fitted to be rotatable about a substantially vertical axis. The pivot shaft portion 19 ₁ is supported on the bearing sleeve 13 via the clip 20 . Swivel suction pipe 1
9 is formed into an L-shape in side view, and is composed of the pivot shaft portion 19 ₁ and a strainer portion 19 ₂ extending approximately horizontally, and the free end portion of the strainer portion 19 ₂ , that is, a position away from the center of rotation. A suction port 21 is opened downward, and this suction port 21 is located at a corner of the oil pan 2 and is always immersed in the lubricating oil Oi stored in the oil pan 2. A strainer plate 22 made of a mesh plate is stretched inside the strainer section ₁₉₂ , and the lubricating oil Oi in the oil pan 2 is filtered through the strainer plate 22 by the drive of the oil pump P, and then the rotating suction pipe 19 and the fixed suction pipe 11 into the suction passage 10.

A weight 25 is fixed to the upper surface of the free end of the strainer portion 19 ₂ of the rotating suction pipe 19 .

The outer circumferential surface of the pivot shaft portion ₁₉₁ of the pivot suction pipe 19, which is slidably fitted into the bearing hole 18, is
A plurality of concave grooves, that is, annular grooves 23 are formed at intervals in the axial direction, and these annular grooves 23 cooperate with the outer circumferential surface of the pivot shaft portion 19 ₁ and the inner circumferential surface of the bearing hole 18 to form a labyrinth. A gasket 24 is formed to oil-tightly seal the gap therebetween. As is clear from FIG. 2, at least a portion of the annular groove 23 is located below the normal oil level _L2 of the lubricating oil Oi in the oil pan 2 during engine operation.

Note that 26 in the figure is an oil return port bored in the buff-full plate 8.

Next, the operation of this embodiment will be explained.

If a vehicle equipped with an engine suddenly accelerates/decelerates, corners, or runs on a slope, the lubricating oil Oi in the oil pan 2 will be affected by the sudden acceleration/deceleration, centrifugal force, or inclination of the engine body E acting on the engine body E. _, the oil level shifts to one side as _shown in _FIGS . Under the lateral load due to its own weight and flowing lubricating oil, it smoothly turns to the side where the lubricating oil has moved, and the suction port 21 at its tip is always immersed in the lubricating oil, so that the lubricating oil in the oil pan 2 is always immersed. Oi can be sucked up reliably.

In this case, at least the lower groove 23 of the plurality of grooves 23 forming the labyrinth seal 24 on the fitting surface between the inner circumferential surface of the bearing cylinder 13 and the outer circumferential surface of the pivot shaft portion 19 ₁ is Since it is located below the oil level _L2 of the lubricating oil Oi stored in the oil pan 2 during engine operation, the lubricating oil Oi can always be held in the lower groove 23, and Therefore, the friction between the fitting surfaces can be reduced as much as possible, and the labyrinth seal effect by the labyrinth packing 24 can be enhanced. As a result, the rotating suction pipe 19 can always be rotated smoothly and easily, and even when the lower end of the gap between the fitting surfaces is temporarily exposed on the oil surface due to the slope of the stored lubricating oil Oi. , it is possible to effectively prevent air from entering the suctioned oil through the gap.

In the above embodiment, the labyrinth packing 24
In forming the pivot shaft part ₁₉₁ , a plurality of annular grooves 23 are formed on the outer peripheral surface of the pivot shaft part 191, but the grooves may have any shape as long as they form the labyrinth packing 24. 19 ₁ may be formed on the inner circumferential surface 18 of the bearing sleeve 13. However, forming the annular groove 23 on the outer circumferential surface of the pivot shaft portion 19 ₁ as in the embodiment described above is easier to process, more cost-effective, and more accurate.

Further, the material of the rotating shaft portion 19 ₁ of the rotating suction pipe 19 is stainless steel, and the material of the bearing cylinder portion 13 of the fixed suction pipe 11 is carbon steel. Selection of such materials increases their corrosion resistance and wear resistance.

C. Effects of the invention As described above, according to the invention, a substantially vertical bearing sleeve that is housed in an oil pan and is connected to a lubricated part of the engine body is fixed to the engine body, A rotating lubricating oil suction device for an internal combustion engine, comprising a rotating suction pipe with a suction port immersed in stored lubricating oil, which is rotatably supported.
The rotating suction pipe is formed into a substantially L-shape by a rotating shaft portion that is rotatably fitted to the inner circumferential surface of the bearing cylinder, and a strainer portion that is connected to a lower end of the rotating shaft portion and extends substantially horizontally. A plurality of concave grooves are formed at intervals in the axial direction on either the outer circumferential surface of the pivot shaft portion or the inner circumferential surface of the bearing cylinder, and a labyrinth packing is formed between these surfaces. , at least the lower part of the labyrinth packing is located below the oil level of the stored lubricating oil during engine operation, and the suction port is opened at the free end of the strainer part, so that it can rotate with the inner circumferential surface of the bearing cylinder. The lubricating oil stored in the oil pan can always be retained in at least a portion of the plural grooves forming the labyrinth seal on the fitting surface with the outer circumferential surface of the shaft. Friction between surfaces can be reduced as much as possible, and the labyrinth sealing effect of the labyrinth packing can be enhanced. As a result, the rotating suction pipe can always be rotated smoothly and easily, and the above-mentioned fitting Even if the lower end of the gap between the mating surfaces is temporarily exposed above the oil surface due to the slope of the stored lubricating oil, it is possible to effectively prevent air from entering the suctioned oil through the gap. Moreover, since there is no need to separately provide other seal members or bearings between the bearing sleeve and the pivot shaft, the number of parts is reduced, the structure is simplified, and costs can be reduced.

Furthermore, since the above-mentioned turning suction pipe is formed into a substantially L-shape by a substantially vertical turning shaft part that fits into the inner peripheral surface of the bearing cylinder and a strainer part connected to the lower end and extending substantially horizontally, In addition to being relatively compact in the vertical direction, it is possible to ensure a long effective radius without making the strainer part deviate significantly in the radial direction, that is, in the horizontal direction, from the rotation axis of the suction pipe, and therefore The range of movement of the strainer can be made as narrow as possible while ensuring a sufficient effective capacity of the strainer, which can greatly contribute to downsizing of the oil pan.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially cutaway side view, Fig. 2 is a longitudinal cross-sectional view taken along the line of Fig. 1, and Fig. 3 is a full cross-sectional view taken along the line of Fig. 2. It is a top view of a plate. E... Engine body, Oi... Lubricating oil, 2...
Oil pan, 13...bearing cylinder, 19...swivel suction pipe, 19 ₁ ...swivel shaft section, 19 ₂ ...strainer section, 21... suction port, 23... annular groove as a concave groove.

Claims (1)

[Scope of utility model registration request] A substantially vertical bearing tube 13 housed in the oil pan 2 and connected to a lubricated part of the engine body E is fixed to the engine body E, and the bearing tube 13 has a suction port into the lubricating oil Oi stored in the oil pan 2. In a rotating type lubricating oil suction device for an internal combustion engine, which is configured to pivotably support a rotating suction pipe 19 in which a pipe 21 is immersed,
The rotating suction pipe 19 is connected to a rotating shaft portion 19 ₁ that is rotatably fitted to the inner circumferential surface of the bearing sleeve 13, and a strainer portion 19 that is connected to the lower end of the rotating shaft portion 19 ₁ and extends substantially horizontally. ₂ and is configured in a roughly L-shape,
A plurality of grooves 23 are formed at intervals in the axial direction on either the outer circumferential surface of the pivot shaft portion 19 ₁ or the inner circumferential surface of the bearing sleeve 13, and a labyrinth packing 24 is formed between these surfaces. At the same time, at least the lower part of the labyrinth packing 24 is located below the oil level _L2 of the stored lubricating oil Oi during engine operation, and the suction port 21 is opened at the free end of the strainer part ₁₉₂ . A swing-type lubricating oil suction device for an internal combustion engine, characterized by: