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US-12618386-B2 - Internal combustion engine

US12618386B2US 12618386 B2US12618386 B2US 12618386B2US-12618386-B2

Abstract

An internal combustion engine includes a blow-by gas passage. The internal combustion engine further includes a ventilation case provided at an intermediate position of the blow-by gas passage. The internal combustion engine further includes a positive crankcase ventilation (PCV) valve provided in the blow-by gas passage and attached to the ventilation case. The PCV valve regulates the amount of blow-by gas flowing through the blow-by gas passage. The internal combustion engine further a plate covering the PCV valve and attached to the ventilation case. The internal combustion engine further includes a cover covering the plate and in contact with part of the plate.

Inventors

  • Naoki TSUNEISHI

Assignees

  • TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date
20260505
Application Date
20241205
Priority Date
20240307

Claims (4)

  1. 1 . An internal combustion engine, comprising: a blow-by gas passage that causes blow-by gas that has leaked from a combustion chamber of the internal combustion engine into a crankcase to flow into an intake system of the internal combustion engine; a ventilation case provided at an intermediate position of the blow-by gas passage; a positive crankcase ventilation valve provided in the blow-by gas passage and attached to the ventilation case, the positive crankcase ventilation valve being configured to regulate an amount of the blow-by gas flowing through the blow-by gas passage; a plate covering the positive crankcase ventilation valve and attached to the ventilation case; and a cover covering the plate and in contact with part of the plate, wherein the ventilation case includes a mount portion that is a protruding portion of the ventilation case, and the positive crankcase ventilation valve is attached to the ventilation case in which a first portion of the positive crankcase ventilation valve is entirely located in a mount hole of the mount portion, a second portion of the positive crankcase ventilation valve that is continuous with the first portion is located outside the mount hole, and the second portion of the positive crankcase ventilation valve covers an entirety of the mount hole, the plate includes a cantilevered portion partially fixed to the mount portion of the ventilation case and a bent portion bent from the cantilevered portion, and the bent portion partially covers the second portion of the positive crankcase ventilation valve in an axial direction of the mount hole, and the cover is in contact with an entirety of the cantilevered portion.
  2. 2 . The internal combustion engine according to claim 1 , wherein the ventilation case includes a mount portion that is a protruding portion of the ventilation case, and the positive crankcase ventilation valve is attached to the ventilation case in which a first portion of the positive crankcase ventilation valve is entirely located in a mount hole of the mount portion, a second portion of the positive crankcase ventilation valve that is continuous with the first portion is located outside the mount hole, and the second portion of the positive crankcase ventilation valve covers an entirety of the mount hole, the positive crankcase ventilation valve includes a third portion extending from the second portion in a direction away from the mount hole, and the positive crankcase ventilation valve has a largest diameter in the second portion, the plate includes a cantilevered portion partially fixed to the mount portion of the ventilation case and a bent portion bent from the cantilevered portion, the bent portion partially covers the second portion of the positive crankcase ventilation valve in an axial direction of the mount hole, and the bent portion does not cover the third portion of the positive crankcase ventilation valve in the axial direction of the mount hole, and a distance between the second portion of the positive crankcase ventilation valve and the bent portion in the axial direction of the mount hole is smaller than a length of the first portion of the positive crankcase ventilation valve in the axial direction of the mount hole.
  3. 3 . The internal combustion engine according to claim 2 , wherein the plate is welded to the mount portion.
  4. 4 . The internal combustion engine according to claim 1 , wherein the cover is a urethane cover made of urethane and surrounds the positive crankcase ventilation valve.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to Japanese Patent Application No. 2024-035079 filed on Mar. 7, 2024, incorporated herein by reference in its entirety. BACKGROUND 1. Technical Field The present disclosure relates to internal combustion engines. 2. Description of Related Art Japanese Unexamined Patent Application Publication No. 2020-133607 (JP 2020-133607 A) discloses a positive crankcase ventilation (PCV) valve. The PCV valve is provided in a blow-by gas passage. The PCV valve regulates the amount of blow-by gas flowing through the blow-by gas passage. The blow-by gas passage is a passage for causing blow-by gas that has leaked from a combustion chamber of an internal combustion engine into a crankcase to flow into an intake system of the internal combustion engine. The PCV valve is covered by a plate in order to prevent the PCV valve from being removed from the internal combustion engine. SUMMARY The plate vibrates while the internal combustion engine is running. This may generate noise. Hereinafter, means for solving the above issue and its functions and effects will be described. One aspect of the present disclosure is an internal combustion engine. The internal combustion engine includes: a blow-by gas passage that causes blow-by gas that has leaked from a combustion chamber of the internal combustion engine into a crankcase to flow into an intake system of the internal combustion engine;a ventilation case provided at an intermediate position of the blow-by gas passage;a positive crankcase ventilation (PCV) valve provided in the blow-by gas passage and attached to the ventilation case, the PCV valve being configured to regulate an amount of the blow-by gas flowing through the blow-by gas passage;a plate covering the PCV valve and attached to the ventilation case; anda cover covering the plate and in contact with part of the plate. The above configuration can reduce vibration of the plate while the internal combustion engine is running. As a result, noise can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS Features, advantages, and technical and industrial significance of exemplary embodiments of the disclosure will be described below with reference to the accompanying drawings, in which like signs denote like elements, and wherein: FIG. 1 is a schematic diagram illustrating a configuration of an internal combustion engine according to an embodiment; FIG. 2 is an exploded perspective view showing a plurality of members attached to a ventilation case of the internal combustion engine shown in FIG. 1; and FIG. 3 is a cross-sectional view showing a part of the ventilation case of the internal combustion engine shown in FIG. 1 in which PCV valve is fixed. DETAILED DESCRIPTION OF EMBODIMENTS Configuration of the Internal Combustion Engine 100 Hereinafter, an internal combustion engine according to an embodiment will be described with reference to the drawings. As shown in FIG. 1, the internal combustion engine 100 includes a cylinder block 16. The internal combustion engine 100 has a cylinder head 18 attached to an upper end portion of the cylinder block 16. The internal combustion engine 100 has a crankcase 12 attached to a lower end portion of the cylinder block 16. An upper portion of the cylinder head 18 is covered with a ventilation case 22. When the combustion of the fuel in the combustion chamber 10 of the internal combustion engine 100 is performed, blow-by gas leaks from the combustion chamber 10 of the internal combustion engine 100 to the crankcase 12. The internal combustion engine 100 includes a blow-by gas reduction device for flowing blow-by gas leaked to the crankcase 12 to the intake system 14 of the internal combustion engine 100. FIG. 1 shows an intake passage 14a which is part of the intake system 14. The blow-by gas reduction device has a blow-by gas passage 20 for causing the blow-by gas to flow into the intake system 14 of the internal combustion engine 100. The blow-by gas reduction device includes a positive crankcase ventilation (PCV) valve 24 for regulating the quantity of blow-by gas flowing through the blow-by gas passage 20. The PCV valve 24 is provided in the blow-by gas passage 20 and is attached to the ventilation case 22. The blow-by gas passage 20 communicates with the crankcase 12. The blow-by gas passage 20 extends in the cylinder block 16 and in the cylinder head 18. The inside of the ventilation case 22 is part of the blow-by gas passage 20. As described above, PCV valve 24 is attached to the ventilation case 22. A hose 21 connects PCV valve 24 and the intake passage 14a. The inside of the hose 21 is part of the blow-by gas passage 20. In this way, the blow-by gas passage 20 communicates with the intake passage 14a. As described above, the ventilation case 22 is provided in the middle of the blow-by gas passage 20. The PCV valve 24 is provided at an intermediate position of the blow-by gas passage 20. As described above, PCV valve 2