Vertical multicylinder straight engine

Patent metadata

Field	Value
Publication number	US-10920650-B2
Application number	US-201815972329-A
Country	US
Kind code	B2
Filing date	May 7, 2018
Priority date	Jun 30, 2017
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

There is provided a vertical multicylinder straight engine in which the temperature distribution of a plurality of cylinder barrels is made close to an even state. A cylinder jacket includes: a jacket inlet; a separated channel; a plurality of separated outlets; and heat dissipater channels for dissipating heat of the respective cylinder barrels to engine cooling water introduced through the separated outlets. The plurality of separated outlets include: a front-side separated outlet to a front-end barrel; a rear-side separated outlet to a rear-end barrel; and middle separated outlets to middle barrels between the front-end barrel and the rear-end barrel, and the jacket inlet is disposed so as to be contained within an entire middle barrel side area that is lateral to the middle barrels and has a front-rear length as long as a length from a front-most end to a rear-most end of the middle barrels.

First claim

What is claimed is:

1. A vertical multicylinder straight engine, comprising:
a cylinder block around a plurality of cylinder barrels, the cylinder block allowing engine cooling water to pass through a cylinder jacket, wherein
the plurality of cylinder barrels include a front-end barrel, a rear-end barrel, and middle barrels disposed between these two barrels, taking a direction along which a crankshaft central axis line extends as a front-rear direction, and a side of a flywheel as a rear side,
the cylinder jacket includes: a jacket inlet for introducing the engine cooling water supplied from a radiator; separated channels for diverting the engine cooling water introduced through the jacket inlet in the front-rear direction; a plurality of separated outlets for diverting the engine cooling water diverted in the front-rear direction toward the respective cylinder barrels; and heat dissipater channels for dissipating heat of the respective cylinder barrels to the engine cooling water introduced through the separated outlets,
the plurality of separated outlets include: a front-side separated outlet to the front-end barrel; a rear-side separated outlet to the rear-end barrel; and middle separated outlets to the middle barrels between the front-end barrel and the rear-end barrel, and
the jacket inlet is disposed so as to be contained within an entire middle barrel side area that is lateral to the middle barrels and has a front-rear length as long as a length from a front-most end to a rear-most end of the middle barrels.

2. The vertical multicylinder straight engine according to claim 1 , wherein
the front-side separated outlet is disposed so as to be contained within a front-end barrel side area that is lateral to the front-end barrel and has a front-rear length as long as a length of the front-end barrel, the rear-side separated outlet is disposed so as to be contained within a rear-end barrel side area that is lateral to the rear-end barrel and has a front-rear length as long as a length of the rear-end barrel, and the middle separated outlets are disposed so as to be respectively contained within middle barrel side areas that are lateral to the middle barrels and have front-rear lengths as long as lengths of the middle barrels.

3. The vertical multicylinder straight engine according to claim 2 , wherein
the engine is a four-cylinder engine, and the jacket inlet is disposed on a backward side of the entire middle barrel side area, the front-side separated outlet is disposed on a backward side of the front-end barrel side area, the rear-side separated outlet is disposed on a forward side of the rear-end barrel side area, and a pair of the middle separated outlets are respectively disposed on a backward side of a pair of the middle barrel side areas.

4. The vertical multicylinder straight engine according to claim 3 , wherein
the cylinder jacket includes a series of partition walls that divide the separated channels from the heat dissipater channels, and
the partition walls are bended along concavity and convexity of side-projecting curved sections of a pair of the middle barrels and a side-depression section between the side-projecting curved sections, and the partition walls include screw bosses at both ends and at bended portions, the screw bosses being for screw fitting with head bolts for fastening a cylinder head to the cylinder block.

5. The vertical multicylinder straight engine according to claim 4 , wherein
the cylinder jacket includes a transverse channel, between the cylinder barrels that are adjacent to each other, through which the engine cooling water passes, and the screw bosses are raised from the partition walls toward a channel inlet of the transverse channel.

6. The vertical multicylinder straight engine according to claim 4 , wherein
the screw bosses are raised from the partition walls toward the side-projecting curved sections of the middle barrels.

7. The vertical multicylinder straight engine according to claim 2 , wherein
the cylinder jacket includes a series of partition walls that divide the separated channels from the heat dissipater channels, and
the partition walls are bended along concavity and convexity of side-projecting curved sections of a pair of the middle barrels and a side-depression section between the side-projecting curved sections, and the partition walls include screw bosses at both ends and at bended portions, the screw bosses being for screw fitting with head bolts for fastening a cylinder head to the cylinder block.

8. The vertical multicylinder straight engine according to claim 7 , wherein
the cylinder jacket includes a transverse channel, between the cylinder barrels that are adjacent to each other, through which the engine cooling water passes, and the screw bosses are raised from the partition walls toward a channel inlet of the transverse channel.

9. The vertical multicylinder straight engine according to claim 7 , wherein
the screw bosses are raised from the partition walls toward the side-projecting curved sections of the middle barrels.

10. The vertical multicylinder straight engine according to claim 1 , wherein
the cylinder jacket includes a series of partition walls that divide the separated channels from the heat dissipater channels, and
the partition walls are bended along concavity and convexity of side-projecting curved sections of a pair of the middle barrels and a side-depression section between the side-projecting curved sections, and the partition walls include screw bosses at both ends and at bended portions, the screw bosses being for screw fitting with head bolts for fastening a cylinder head to the cylinder block.

11. The vertical multicylinder straight engine according to claim 10 , wherein
the cylinder jacket includes a transverse channel, between the cylinder barrels that are adjacent to each other, through which the engine cooling water passes, and the screw bosses are raised from the partition walls toward a channel inlet of the transverse channel.

12. The vertical multicylinder straight engine according to claim 11 , wherein
the screw bosses are raised from the partition walls toward the side-projecting curved sections of the middle barrels.

13. The vertical multicylinder straight engine according to claim 10 , wherein
the screw bosses are raised from the partition walls toward the side-projecting curved sections of the middle barrels.

14. The vertical multicylinder straight engine according to claim 1 , wherein
an opening lower edge of each of the separated outlets is disposed at a position higher than a vertical center of a cylinder barrel to which the corresponding separated outlet faces.

15. The vertical multicylinder straight engine according to claim 14 , wherein
the opening lower edge of each of the separated outlets is disposed at a position lower than a lowermost position of a pressure ring of a piston at a top dead point within the cylinder barrel to which the corresponding separated outlet faces, and at a position higher than a lowermost position of the piston.

16. The vertical multicylinder straight engine according to claim 1 , wherein
the cylinder block includes: an oil inlet for introducing engine oil supplied from an oil pump; oil delivery channels for diverting the engine oil introduced through the oil inlet in the front-rear direction; a plurality of diverting oil outlets for diverting the engine oil that is diverted in the front-rear direction by the oil delivery channels to an oil jet nozzle facing the piston,
the oil delivery channels are directed in the front-rear directi

Assignees

• Kubota Kk

Inventors

• Ichikawa Takayuki
• Ishihara Mutsuhisa
• Asada Shinya
• Kobayashi Yasushi

Classifications

• F02F2001/106

  using a closed deck, i.e. the water jacket is not open at the block top face · CPC title

• F02F1/14

  Cylinders with means for directing, guiding or distributing liquid stream · CPC title

• F01P2003/021

  Cooling cylinders · CPC title

• F01P3/02 Primary

  Arrangements for cooling cylinders or cylinder heads · CPC title

• F02B2075/182

  five · CPC title