JP2019011743A - Oil pan - Google Patents

Abstract

To provide an oil pan that can continuously be equipped without inconvenience over a long term, while eliminating drawbacks of an arrangement space and cost aspect concerning a weight for preventing or reducing the vibration of an engine, by paying its attention to the oil pan being an existing structure.SOLUTION: An oil pan 4 attached to an engine in order to hold a predetermined amount of lubricant is constituted by having a double-structured oil pan body 4A where a first oil pan member 7 and a second oil pan member 8 made of materials different from each other are overlapped inside/outside and integrated. An outside first oil pan member 7 is made of an aluminum alloy, and an inside second oil pan member 8 is made of a cast iron.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an oil pan attached to various engines such as an industrial diesel engine and a spark ignition engine.

  2. Description of the Related Art Diesel engines that can produce a large torque even at a low engine speed are often used for industrial engines such as agricultural machinery, construction machinery, and generators, or vehicle engines such as trucks and buses. However, on the other hand, diesel engines tend to have large vibrations.

  Therefore, for example, in an industrial diesel engine mounted on a riding lawn mower or the like, a balancer weight is provided at an upper position or a lateral position (Patent Document 1) of the engine so as to reduce vibrations associated with engine rotation. It was.

JP 2003-64719 A

  However, the means for providing the balancer weight above and to the side of the engine has a problem that the support bracket is easily damaged by vibration. Further, in order to prevent fatigue failure, the support racket must be increased in size, and new problems arise in securing the arrangement space and cost.

  An object of the present invention is to focus on an oil pan having an existing structure, so that a weight for preventing or reducing engine vibration can be provided over a long period of time without causing any disadvantages in arrangement space and cost. An object of the present invention is to provide an oil pan that can be continuously equipped without inconvenience.

The present invention provides an oil pan attached to an engine to hold a predetermined amount of lubricating oil,
The first oil pan member 7 and the second oil pan member 8 made of different materials have a double-structured oil pan body 4A that overlaps and integrates inside and outside.

The second aspect of the present invention is an oil pan according to the present invention,
The integrated portion of the first oil pan member 7 and the second oil pan member 8 is provided with an engaging portion 9 having irregularities or undulations protruding from the mating members 7, 8. To do.

The third aspect of the present invention is an oil pan according to the second aspect of the present invention,
The engaging portion 9 is formed in a state in which the engaging portions 9 are fitted to the mating members 7 and 8 so as not to be extracted.

In the oil pan according to any one of the present invention to the third invention,
Of the first and second oil pan members 7, 8, the oil pan member 7 disposed outside is made of a material having corrosion resistance, and the oil pan member 8 disposed inside is made of a material having a high specific gravity. It is characterized by being set respectively.

The fifth aspect of the present invention is the oil pan according to the fourth aspect of the present invention,
The oil pan member 7 arranged on the outside is made of an aluminum alloy, and the oil pan member 8 arranged on the inside is made of cast iron.

In a sixth aspect of the present invention, in any one of the present invention to the fifth aspect of the present invention,
A drain passage 10 is formed between the first oil pan member 7 and the second oil pan member 8 so that at least one of the both 7, 7 is recessed. And

The seventh aspect of the present invention is the oil pan according to the sixth aspect of the present invention,
The drain passage 10 becomes an oil passage 11 for supplying oil from the oil pan 4 when the outlet 14 thereof is blocked by a drain bolt 15, and an oil passage for oil drain when the drain bolt 15 is removed. It is characterized by being comprised in the state used as 10.

According to the present invention, since the first oil pan member and the second oil pan member, which are made of materials different from each other, have a double structure, the oil pan member is made of a material that is hardly rusted and has corrosion resistance on the outside. In addition, as an oil pan member having a large specific gravity on the inside, an oil pan that also serves as a balance weight can be obtained.
Since the oil pan is located relatively far from the center of gravity of the engine, it is possible to exert an effect of suppressing or attenuating engine vibration. Therefore, the oil pan, which is an existing component member, can also be used as a balance weight. .

As a result, by paying attention to the oil pan which is an existing structure, the weight for preventing or reducing the vibration of the engine can be eliminated without inconvenience for a long time while avoiding the disadvantage of the arrangement space and cost. It is possible to provide a rational oil pan that can be continuously equipped.

The outline of an industrial diesel engine is shown, (a) is a front view, (b) is a side view. The structure of an oil pan is shown, (a) is the sectional view on the AA line of FIG.1 (b), (b) is the sectional view on the CC line of FIG.1 (a). 1 shows the structure of an oil pan, and is a cross-sectional view taken along line BB in FIG.

  In the following, an embodiment of an oil pan according to the present invention will be described with reference to the drawings when used in a small industrial diesel engine. In the engine E, the one with the radiator cooling fan 5 is defined as the front, the one with the flywheel is defined as the rear, and the left and right are defined based on the front-rear relationship.

  As shown in FIGS. 1A and 1B, an industrial diesel engine E includes a cylinder block 1, a cylinder head 2 assembled on the cylinder block 1, a head cover 3 assembled on the cylinder head 2, and a cylinder. It has an oil pan 4 assembled under the block 1. A cooling fan 5 is provided in front of the cylinder block 1 and a flywheel 6 is provided in the rear.

  The oil pan 4 attached to the engine to hold a predetermined amount of lubricating oil has an oil pan main body 4A, an upper flange portion 4B, a drain bolt 15 and the like. The flange portion 4B is attached to the bottom surface 1a of the cylinder block 1 in a sealed state by a plurality of bolts (not shown), whereby the oil pan 4 is removably assembled to the cylinder block 1.

  2 (a), 2 (b) and FIG. 3, the oil pan 4 is made of an aluminum alloy and includes an outer first oil pan member 7 and an inner second oil pan member 8 made of cast iron. It has a double-structured oil pan body 4A which is integrated inside and outside. The flange portion 4B has a double structure in which the first and second oil pan members 7 and 8 are overlapped in the lateral direction, but the outer peripheral portion 4b bolted to the cylinder block 1 is the first oil pan member. 7 only.

  That is, in the oil pan 4, the first oil pan member 7 disposed on the outer side of the first and second oil pan members 7 and 8 is made of a material having corrosion resistance (resistant to rust) and on the inner side. The second oil pan member 8 to be disposed is set to a material having a large specific gravity (heavy). With this configuration, an oil pan 4 that is very heavy and also has a corrosion resistance without performing a surface treatment such as painting is realized.

  As shown in FIG. 2 (a), the integral part of the first oil pan member 7 and the second oil pan member 8 has a triangular projection pointed out on the mating members 7 and 8 ( An example of unevenness or undulations) An engagement portion 9 having 7a and 8a is provided. The mating member of the first oil pan member 7 is the second oil pan member 8, and the mating member of the second oil pan member 8 is the first oil pan member 7. For example, the first oil pan member 7 made of aluminum alloy is cast outside the second oil pan member 8 made of cast iron having a large number of continuous projections 8a, so that the projections 7a and 8a are mutually formed in almost the entire area of the overlapping portion. The oil pan 4 having a double structure is manufactured while the engaging portion 9 to be engaged is formed. Each protrusion 7a, 8a may be a protrusion.

  As shown in the blow-out view (partially enlarged view) of FIG. 2A, the engaging portion 9 may be formed in a state in which the mating members 9 and 8 are fitted to the mating members 7 and 8 so as not to be extracted. For example, each of the protrusions 7a and 8a is formed in a shape that expands toward the tip. Therefore, even if a force that causes the first oil pan member 7 and the second oil pan member 8 to be peeled off is applied, the tightly integrated state is maintained by the engagement portions 9 that do not need to be pulled out from each other. There are advantages.

  The second oil pan member 8 has a large number of protrusions (or protrusions) 8a also formed on the inner peripheral surface 8A where the lubricating oil is stored. By providing a large number of protrusions 8a on the inner peripheral surface 8A to roughen the surface, it is possible to expect an attenuation effect due to sound diffusion in the oil pan 4. The Helmholtz resonance effect can further reduce noise.

  As shown in FIGS. 2 and 3, a drain path is formed by recessing at least one of the first oil pan member 7 and the second oil pan member 8. 10 and / or the oil passage 11 is formed. Specifically, a recess in which both the first oil pan member 8 side of the first oil pan member 7 and the first oil pan member 7 side of the second oil pan member 8 are recessed in the bottom wall of the oil pan body 4A. By forming the inlets 12 and 13, the drain path 10 having a substantially circular cross section is formed.

  The front end of the drain passage 10 that is formed long in the front-rear direction is opened in the front wall of the oil pan body 4A, and the drain bolt 15 is screwed into the female screw portion 14 formed in the opening. It is. A rear end of the drain passage 10 is extended to the oil pan body 4A up to the front and rear center part, and a vertical hole 16 is formed to communicate the rear end and the inside of the oil pan.

  A mushroom-shaped oil strainer 17 is mounted in the vertical hole 16. The oil strainer 17 includes a pipe portion 17a fitted in the vertical hole 16, an umbrella-shaped strainer portion 17b, and a filtration portion 17c equipped on the strainer portion 17b. That is, the inlet of the drain path 10 is the oil strainer 17.

  As shown in FIGS. 2B and 3, an oil passage 11 is formed that is a vertical hole that communicates the front end of the drain passage 10 and the upper surface 4 t of the flange portion 4 </ b> B. Formed are recessed portions 18 and 19 in which both the first oil pan member 7 side of the first oil pan member 7 and the first oil pan member 7 side of the second oil pan member 8 are recessed on the side wall of the oil pan body 4A. By doing so, an oil passage 11 having a substantially circular cross section is formed.

  A vertical hole-shaped oil passage 20 formed in the cylinder block 1 and the oil passage 11 of the oil pan 4 are communicated with each other while being sealed by an O-ring 21. That is, the drain path 10 functions literally as a drain path for removing the lubricating oil from the oil pan 4 when the oil is changed. In a state where the outlet is blocked by the drain bolt 15, that is, in a normal state, the oil pan 4 is configured so as to function as a supply oil passage for transferring the oil in the oil pan 4 to a device such as an oil pump (not shown). ing.

  That is, the drain passage 10 is an oil passage (supply oil passage) that supplies oil from the oil pan 4 to the oil passage 20 on the cylinder block 1 side when the female screw portion 14 that is the outlet of the drain passage 10 is closed by the drain bolt 15. 11, when the drain bolt 15 is removed, the oil drain oil passage (discharge oil passage) 10 is formed.

  According to the present invention, the first oil pan member 7, which is an aluminum alloy outer, is cast on the outside of the second oil pan member 8, which is an inner made of cast iron and provided with protrusions (warm shape) 7 a, 8 a on the surface. Since the oil pan 4 has a double structure, for example, it can be very heavy, for example, 20 kg or more, and can function as a balance weight.

  Since the oil pan 4 is located at a position away from the center of gravity of the engine E (approximately at the center of the cylinder block 1), the oil pan 4 has an engine vibration equivalent to that of the conventional means for loading a weight on the upper side of the head cover. An inhibitory effect can be expected. Moreover, since the weight is included in the oil pan 4 as the second oil pan member 8, neither a dedicated weight nor an arrangement space is required, and a very rational configuration can be realized.

  The drain path 10 can be made as follows. That is, a groove (recessed portion 13) is provided for the oil passage on the surface of the second oil pan member 8 made of cast iron, and when the first oil pan member 7 made of aluminum alloy is cast, The drain path 10 can be formed by inserting a pin so that a groove (recessed portion 12) is formed at a corresponding location, and removing the pin after casting.

The following (1) to (5) can be considered as the effects of the oil pan of the present invention.
(1) Radiation noise from the oil pan 4 is reduced by the damping effect of carbon in the cast iron that is the material of the second oil pan member 8.

(2) Due to the double structure in which the outer side is the first oil pan member 7 made of an aluminum alloy, surface treatment such as painting is unnecessary, and an inexpensive oil pan 4 can be obtained.
(3) Due to the presence of the protrusions 7a and 8a of the engaging portion 9 where the first and second oil pan members 7 and 8 overlap and the protrusion 8a of the inner peripheral surface 8A of the second oil pan member 8, the anchor effect As a result, the bonding strength between the first and second oil pan members 7 and 8 is enhanced, and the noise can be reduced by the Helmholtz resonance effect.

(4) Since the balance weight conventionally provided on the head cover can be omitted, the assembly as an engine can be simplified. In addition, the simplified oil strainer 17 can improve productivity and reduce costs.
(5) The inertial center of gravity as the engine E can be set at a position lower than the conventional one, thereby reducing rolling vibration.

[Another Example]
It is possible to form the first oil pan member 7 from a stainless material or a synthetic resin material, and to form the second oil pan member 8 from a material having a high specific gravity other than cast iron. The oil pan 4 without the oil strainer 17 or the oil passage 11 may be used.

4A Oil pan body 7 First oil pan member 8 Second oil pan member 9 Engagement portion 10 Drain path (oil path)
11 Oil passage 14 Drain passage outlet 15 Drain bolt

Claims (7)

An oil pan attached to the engine to hold a predetermined amount of lubricating oil,
An oil pan having a double-structured oil pan body in which a first oil pan member and a second oil pan member made of different materials are overlapped and integrated inside and outside.   2. The oil pan according to claim 1, wherein an integrated portion of the first oil pan member and the second oil pan member is provided with an engaging portion having irregularities or undulations protruding from each other.   The oil pan according to claim 2, wherein the engaging portions are formed in a state in which the engaging portions are fitted to each other so as not to be extracted.   Of the first and second oil pan members, the oil pan member arranged on the outside is made of a material having corrosion resistance, and the oil pan member arranged on the inside is made of a material having a high specific gravity. The oil pan according to any one of claims 1 to 3.   The oil pan according to claim 4, wherein the oil pan member disposed outside is made of an aluminum alloy, and the oil pan member disposed inside is made of cast iron.   The drain path formed by recessing at least one of the two between the first oil pan member and the second oil pan member is formed according to any one of claims 1 to 5. Oil pan.   The drain path is configured to be an oil path for supplying oil from the oil pan when the outlet is closed by a drain bolt, and to be an oil path for oil drain when the drain bolt is removed. The oil pan according to claim 6.

Images