IP Library › Granted Patent US 12704083
Granted Patent B2
US 12704083 · App. 18/565,165 · Granted Aug 11, 2026

Temperature raising mechanism for blow-by gas treatment device and engine provided with temperature raising mechanism for blow-by gas treatment device

Inventors: Yu Suzuki (Sakai, JP); Yuki Yoshita (Sakai, JP); Satoshi Shibata (Sakai, JP)
Assignee: KUBOTA CORPORATION
F01M13/0416F01M5/001F01M11/02F01M13/02F01M2013/0438
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 12704083
App. No.
18/565,165
Granted
Aug 11, 2026
Kind
B2
Abstract

A temperature raising mechanism 800 for a blow-by gas treatment device has a head cover 4 assembled to a cylinder head, a blow-by gas treatment device 100 which is disposed in the head cover 4 and treats the blow-by gas, and heating means 600 which is fixed to an outer surface 703 of the head cover 4 and generates heat. The blow-by gas treatment device 100 has a partition wall part 200 which partitions an inside of the head cover 4 into a plurality of regions, and a separating portion 330 which separates the blow-by gas into oil and gas. The head cover 4 has a heat conducting portion 700 which is in contact with the partition wall part 200 and conducts the heat generated by the heating means 600 to the separating portion 330.

Claims (61)

1 . A temperature raising mechanism for a blow-by gas treatment device which treats blow-by gas generated in an engine, comprising:

a head cover which is assembled to a cylinder head of the engine;

the blow-by gas treatment device which is disposed in the head cover and treats the blow-by gas; and

heating means which is fixed to an outer surface of the head cover and generates heat, wherein

the blow-by gas treatment device has:

a partition wall part which is fixed to the head cover and partitions an inside of the head cover into a plurality of regions; and

a separating portion which is provided in the partition wall part and separates the blow-by gas into oil and gas;

the separating portion has a flow-velocity raising operation portion which has a throttle hole and an impactor structure aligned close to said throttle hole raising a flow velocity of the blow-by gas by causing the blow-by gas to pass through the throttle hole; and

the head cover has a heat conducting portion which is in contact with the partition wall part and conducts the heat generated by the heating means to the throttle hole of the separating portion via the partition wall part.

2 . The temperature raising mechanism for the blow-by gas treatment device according to claim 1 , wherein

the partition wall part has a heat-conduction assisting portion which is in contact with the heat conducting portion, receives the heat generated by the heating means, and conducts the heat to the throttle hole of the separating portion; and

the outer surface is inclined with respect to an upper surface of the heat-conduction assisting portion.

3 . The temperature raising mechanism for the blow-by gas treatment device according to claim 1 , wherein

the partition wall part has a heat-conduction assisting portion which is in contact with the heat conducting portion, receives the heat generated by the heating means, and conducts the heat to the throttle hole of the separating portion; and

the outer surface is perpendicular with respect to an upper surface of the heat-conduction assisting portion.

4 . The temperature raising mechanism for the blow-by gas treatment device according to claim 1 , wherein

the heating means is a heater which has a positive temperature characteristic using a semiconductor ceramic with barium titanate as a main component.

5 . The temperature raising mechanism for the blow-by gas treatment device according to claim 1 , wherein

a thickness of a part in the heat conducting portion in contact with the partition wall part is larger than the thickness of the other parts in the heat conducting portion not in contact with the partition wall part.

6 . The temperature raising mechanism for the blow-by gas treatment device according to claim 1 , wherein

the separating portion is provided with inclination in a direction in which the oil separated from the blow-by gas by the separating portion is led to an oil guiding portion.

7 . The temperature raising mechanism for the blow-by gas treatment device according to claim 6 , wherein

the flow-velocity raising operation portion raises the flow velocity of the blow-by gas along a direction inclined with respect to a vertical direction;

the separating portion further has:

a filter through which the blow-by gas whose flow velocity is raised by the flow-velocity raising operation portion is passed; and

a collision plate against which the blow-by gas having passed through the filter is caused to collide and is separated to the oil and the gas; and

a surface of the flow-velocity raising operation portion opposed to the collision plate is inclined downward toward the oil guiding portion.

8 . An engine including a temperature raising mechanism for a blow-by gas treatment device which treats blow-by gas generated in the engine, wherein

the temperature raising mechanism for the blow-by gas treatment device has:

a head cover which is assembled to a cylinder head of the engine;

the blow-by gas treatment device which is disposed in the head cover and treats the blow-by gas; and

heating means which is fixed to an outer surface of the head cover and generates heat; and

the blow-by gas treatment device has:

a partition wall part which is fixed to the head cover and partitions an inside of the head cover into a plurality of regions; and

a separating portion which is provided in the partition wall part and separates the blow-by gas into oil and gas;

the separating portion has a flow-velocity raising operation portion which has a throttle hole and an impactor structure aligned close to said throttle hole raising a flow velocity of the blow-by gas by causing the blow-by gas to pass through the throttle hole; and

the head cover has a heat conducting portion which is in contact with the partition wall part and conducts heat generated by the heating means to the throttle hole of the separating portion via the partition wall part.

9 . The temperature raising mechanism for the blow-by gas treatment device according to claim 2 , wherein

the heating means is a heater which has a positive temperature characteristic using a semiconductor ceramic with barium titanate as a main component.

10 . The temperature raising mechanism for the blow-by gas treatment device according to claim 3 , wherein

the heating means is a heater which has a positive temperature characteristic using a semiconductor ceramic with barium titanate as a main component.

11 . The temperature raising mechanism for the blow-by gas treatment device according to claim 2 , wherein

a thickness of a part in the heat conducting portion in contact with the partition wall part is larger than the thickness of the other parts in the heat conducting portion not in contact with the partition wall part.

12 . The temperature raising mechanism for the blow-by gas treatment device according to claim 3 , wherein

a thickness of a part in the heat conducting portion in contact with the partition wall part is larger than the thickness of the other parts in the heat conducting portion not in contact with the partition wall part.

13 . The temperature raising mechanism for the blow-by gas treatment device according to claim 4 , wherein

a thickness of a part in the heat conducting portion in contact with the partition wall part is larger than the thickness of the other parts in the heat conducting portion not in contact with the partition wall part.

14 . The temperature raising mechanism for the blow-by gas treatment device according to claim 9 , wherein

a thickness of a part in the heat conducting portion in contact with the partition wall part is larger than the thickness of the other parts in the heat conducting portion not in contact with the partition wall part.

15 . The temperature raising mechanism for the blow-by gas treatment device according to claim 10 , wherein

a thickness of a part in the heat conducting portion in contact with the partition wall part is larger than the thickness of the other parts in the heat conducting portion not in contact with the partition wall part.

16 . The temperature raising mechanism for the blow-by gas treatment device according to claim 2 , wherein

the separating portion is provided with inclination in a direction in which the oil separated from the blow-by gas by the separating portion is led to an oil guiding portion.

17 . The temperature raising mechanism for the blow-by gas treatment device according to claim 3 , wherein

the separating portion is provided with inclination in a direction in which the oil separated from the blow-by gas by the separating portion is led to an oil guiding portion.

18 . The temperature raising mechanism for the blow-by gas treatment device according to claim 4 , wherein

the separating portion is provided with inclination in a direction in which the oil separated from the blow-by gas by the separating portion is led to an oil guiding portion.

19 . The temperature raising mechanism for the blow-by gas treatment device according to claim 5 , wherein

the separating portion is provided with inclination in a direction in which the oil separated from the blow-by gas by the separating portion is led to an oil guiding portion.

20 . The temperature raising mechanism for the blow-by gas treatment device according to claim 9 , wherein

the separating portion is provided with inclination in a direction in which the oil separated from the blow-by gas by the separating portion is led to an oil guiding portion.