Breather device for engine

Patent metadata

Field	Value
Publication number	US-9816411-B2
Application number	US-201514842184-A
Country	US
Kind code	B2
Filing date	Sep 1, 2015
Priority date	Sep 25, 2014
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

There is provided a breather device for an engine and capable of suppressing forming of separated oil into mist again. The breather device for the engine includes an oil filter chamber at a midpoint of a blow-by gas passing route and an oil filter housed in the oil filter chamber. The oil filter chamber is partitioned with a partition wall into an upstream filter chamber and a downstream filter chamber arranged in a front-back direction, the filter is formed by an upstream filter and a downstream filter, the upstream filter is housed in the upstream filter chamber and the downstream filter is housed in the downstream filter chamber, respectively, and a side gas expansion chamber is provided beside the oil filter chamber so that blow-by gas flows from the upstream filter into the downstream filter through the side gas expansion chamber.

First claim

What is claimed is:

1. A breather device for an engine and comprising an oil filter chamber at a midpoint of a blow-by gas passing route and an oil filter housed in the oil filter chamber,
wherein the oil filter chamber is partitioned with a partition wall into an upstream filter chamber and a downstream filter chamber arranged in a front-back direction, the filter is formed by an upstream filter and a downstream filter, the upstream filter is housed in the upstream filter chamber and the downstream filter is housed in the downstream filter chamber, respectively, and a side gas expansion chamber is provided beside the oil filter chamber so that blow-by gas flows from the upstream filter into the downstream filter through the side gas expansion chamber, and
wherein a side wall is provided between the oil filter chamber and the side gas expansion chamber and an upstream filter chamber outlet and a downstream filter chamber inlet are open respectively in portions of the side wall close to the partition wall.

2. The breather device for the engine according to claim 1 , wherein the side gas expansion chamber is provided on each of opposite sides of the oil filter chamber.

3. The breather device for the engine according to claim 1 , wherein the blow-by gas passing route is provided along a ceiling wall of a cylinder head cover, the side gas expansion chamber and a cartridge chamber are provided below the ceiling wall of the cylinder head cover, a filter cartridge is housed in the cartridge chamber, and the upstream filter chamber and the downstream filter chamber are provided in the filter cartridge.

4. The breather device for the engine according to claim 2 , wherein the blow-by gas passing route is provided along a ceiling wall of a cylinder head cover, the side gas expansion chamber and a cartridge chamber are provided below the ceiling wall of the cylinder head cover, a filter cartridge is housed in the cartridge chamber, and the upstream filter chamber and the downstream filter chamber are provided in the filter cartridge.

5. The breather device for the engine according to claim 3 , wherein the filter cartridge is detachably housed in the cartridge chamber.

6. The breather device for the engine according to claim 4 , wherein the filter cartridge is detachably housed in the cartridge chamber.

7. The breather device for the engine according to claim 5 , wherein the side gas expansion chamber and the filter cartridge are covered with a single bottom plate from below and the bottom plate forms a bottom wall of the side gas expansion chamber and supports the filter cartridge in the cartridge chamber.

8. The breather device for the engine according to claim 6 , wherein the side gas expansion chamber and the filter cartridge are covered with a single bottom plate from below and the bottom plate forms a bottom wall of the side gas expansion chamber and supports the filter cartridge in the cartridge chamber.

9. The breather device for the engine according to claim 1 , wherein the plurality of oil filter chambers are disposed in series in the blow-by gas passing route.

10. The breather device for the engine according to claim 2 , wherein the plurality of oil filter chambers are disposed in series in the blow-by gas passing route.

Assignees

• Kubota Kk

Inventors

• Hamada Kazuya
• Kimura Yuya

Classifications

• F01M13/0416 Primary

  arranged in valve-covers · CPC title

• F01M2013/0072

  in series · CPC title

• F01M2013/0438

  with a filter · CPC title