JPS6028516Y2 - centrifugal oil filter - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a centrifugal oil filter for engine oil that is mainly applied to four-stroke engines.

Conventionally, as this type of centrifugal oil filter,
In addition to those described in Japanese Utility Model Publication No. 4-42078 and Japanese Utility Model Publication No. 39-5983, the one shown in FIG. 5 has been proposed.

In the figure, 1 is a crankcase, 2 is a wire mesh with low suction resistance, and the engine oil 3 inside the crankcase 1 is
4 is a flow path for the engine oil 3 from which large dust particles have been removed by filtering through the primary filter 2; 5 is an oil pump consisting of a trochoid pump; this oil pump 5 is connected to the crankcase by bolts 6; It is installed on 1.

Reference numeral 7 denotes a rotating shaft equipped with passages 8a and 8b for engine oil 3, and a pump gear 9 attached to this rotating shaft 7.
It is driven by the crank gear 10 via the engine and rotates integrally with the engine.

Reference numeral 11 denotes a casing, and this casing 1 is fixed to the pump gear 9 with bolts 12 and rotates together with the rotating shaft 7.

Reference numeral 13 denotes a centrifugal separation chamber formed within the casing 11, and the casing 11 having this centrifugal separation chamber 13 constitutes a centrifugal filter 14 which is a secondary filter.

15 is a cover, 16 is an oil partition plate, and 17 is a drain plug for discharging the engine oil 3.

In Fig. 5, engine oil 3 is filtered in advance by a wire mesh filter in a primary filter 2 to remove large dust particles, and is sucked into an oil pump 5 through a flow path 4 as indicated by the arrow in the figure, where the pressure is increased. Thereafter, it enters the centrifugal separation chamber 13 of the centrifugal filter 14, which is a secondary filter, through the flow path 8a in the rotating shaft 7.

In this centrifugal filter 14, the engine oil 3 is subjected to centrifugal force due to high-speed rotation to separate fine dust 18 such as iron powder, and then is discharged from the flow path 8b.

The discharged engine oil 3 is sent to lubricated parts such as cams, tappets, and bearings.

In principle, the centrifugal filter 14 configured as described above has a reduced purification efficiency when the engine rotates at low speed because the centrifugal force is reduced.

In particular, the reduction in purification efficiency of motorcycle engines when used at low speeds has been a major problem.

Also, when the engine stops rotating, the casing 1
The dust 18 collected on the dust collecting part of the inner peripheral surface 19 of the centrifugal chamber 1, that is, the outer peripheral part 20 of the centrifugal separation chamber, may fall into the engine oil 3. There is a problem in that the oil 3 contains dust 18, which substantially impairs the filtering ability.

This idea was made to improve the above drawbacks.
It has a magnetized layer around the outer periphery of the centrifugation chamber.

It is an object of the present invention to provide a centrifugal oil filter that can attach and separate dust such as fine iron powder even when the engine is stopped or rotates at low speed by providing a dust trap.

Embodiments of this invention will be described below with reference to the drawings.

FIG. 1 shows an example of a centrifugal filter according to this invention. In the figure, a dust trap 21 consisting of a magnetized layer is attached to the inner circumferential surface of the aluminum die-cast casing 11.
9 and is formed by a magnetic plate located on the outer periphery 20 of the centrifugation chamber 13.

FIG. 2 shows an example of a state in which a dust trap 21 formed by a magnetic plate is attached to the centrifugal filter 14 shown in FIG. 1.

That is, the mounting bolts 12 (
(see Figure 1) are inserted into the three mounting host portions 23a, 23.
b and 23c are formed, and the dust capture body 21 is attached to these mounting boss portions 23 a q 23 bq 23
It is divided into three by c.

In this way, by providing the dust trap 21 made of a magnetized layer on the outer periphery 20 of the centrifugal separation chamber 13, even when the engine is stopped or rotates at low speed, that is, when centrifugal force does not act or is small, the magnetic force Since the dust 18 such as fine metal powder is forcibly and reliably attached to the dust trap 21, the drawbacks of conventional centrifugal filters can be solved.

In the centrifugal filter 14 of this invention, in addition to casting the magnetic plate on the inner circumferential surface 19 of the casing 11 as described above, the magnetic plate is press-fitted into the inner circumferential surface 19.
Alternatively, the redust trap 21 can be formed by adhering.

Alternatively, the casing 11 itself can be made of an iron-based material, and it can be magnetized to form a magnetized layer to form the dust trap 21.

Furthermore, if a dust trapping material made of an iron-based porous material such as ultra-fine steel fiber is used and the dust trap 21 is constructed by magnetizing it to form a magnetized layer, in addition to fine metal powder, fine particles can be collected. Non-magnetic dust can also be effectively captured.

In this way, even if a porous member is used as the dust capture body 21, since this porous member is located at the outer circumference 20 of the centrifugal separation chamber 13, most of the oil 3 passes through the inside of the porous member. Therefore, there is no risk that the porous member will pose a large resistance to the flow of the oil 3.

Of course, if the magnetic plate shown in FIGS. 1 and 2 is used as the dust capture body 21, the dust capture body 21 will hardly provide any resistance to the oil 3.

Furthermore, even if a large amount of metal fine powder adheres to the dust capture body 21 and the adsorption capacity is almost saturated, new metal fine powder will be pressed against the dust capture body 21 on the outer peripheral part 20 due to centrifugal force. , it is still possible to effectively capture metallic iron powder.

Moreover, as described above, since most of the oil 3 flows near the center of the centrifugal separation chamber 13 away from the dust trap 21, the dust trap 21 has a weak adsorption force due to the saturated state.
There is no fear that even the metal fine powder adsorbed on the dust trap 21 will fall off from the dust trap 21 due to the flow of the oil 3.

Therefore, the amount of metal fine powder removed increases, that is, the metal fine powder is removed more effectively.

Furthermore, as shown in FIG. 3, if the outer peripheral part 20 of the centrifugal separation chamber 13 is divided in the axial direction and the magnetic plate 21a and the dust-catching material 21b are made adjacent to each other to form the dust-catching body 21, fine metal powder can be removed. It can also effectively remove dust other than fine metal powder.

The same effect can be obtained even if the magnet plate and the dust trapping material are divided in the circumferential direction and placed adjacent to each other.

FIG. 4 shows an example in which this invention is applied to another type of centrifugal filter 14.

In the figure, a centrifugal filter 14 is fixed to the end of a crankshaft 22 with a nut 23, rotates integrally with the engine, and filters engine oil 3 sent out from an oil pump 24, which is also driven by the power of the engine. The liquid is introduced into the centrifugal separation chamber 13 through the flow passage 25, and after separating and removing dust, it is supplied from the outflow passage 26 to the sliding metal 28 of the crank arm 27.

A dust trap 21 is also provided on the outer periphery 20 of the centrifugal separation chamber 13, thereby effectively removing fine dust.

In addition, 29 is a drive gear fixed to the crankshaft 22,
It drives a driven gear 30 such as a balancer gear.

As explained above, this idea uses a dust trap with a magnetized layer on the outer periphery of the centrifugal separation chamber, so that the dust in the engine oil can be reliably separated and removed regardless of the engine speed. A type oil filter can be provided.

Furthermore, since the dust trap is located at the outer periphery of the centrifugation chamber, most of the oil does not come into contact with the dust trap, so there is no risk that the dust trap will create a large resistance to the flow of oil.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing one embodiment of this invention, Fig. 2 is a front view showing the main part of Fig. 1, and Fig. 3 is a longitudinal sectional view of the main part showing another embodiment of this invention. 4 is a longitudinal sectional view showing an example in which this invention is applied to another type of centrifugal filter, and FIG. 5 is a longitudinal sectional view showing a conventionally proposed centrifugal oil filter. 2...Primary filter, 3...Engine oil, 11...Casing, 13...
・Centrifugal separation chamber, 14...Centrifugal filter (secondary filter), 18...Dust, 20...
Outer peripheral part, 21... Dust capture body, 21a...
... Magnetization layer, 21b ... Dust trapping material.

Claims (2)

[Scope of utility model registration request] (1) A centrifugal oil filter comprising a casing that rotates in conjunction with the engine, and a centrifugal separation chamber that is formed within the casing and that receives engine oil and separates and removes dust in the engine oil. A centrifugal oil filter characterized in that a dust trap having a magnetized layer and capturing the separated and removed dust is provided on the outer periphery of the centrifugal separation chamber. (2) The trapping body that captures dust is a centrifugal centrifuge according to claim 1 of the utility model registration claim, which is formed by combining a magnetized layer and a dust-catching material made of a porous member arranged adjacent to the magnetized layer. formula oil filter.