Internal combustion engine having an auxiliary combustion chamber without an intake valve

• US 4,108,133 A
• Filed: 08/24/1976
• Issued: 08/22/1978
• Est. Priority Date: 07/31/1974
• Status: Expired due to Term

• Current Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Nakamura, Norihiko, Kobayashi, Tatsuo, Baika, Toyokazu, Konishi, Masami
• Primary Examiner(s): Myhre, Charles J.
• Assistant Examiner(s): Reynolds, David D.
• Application Number:
  US05/717,463
• Time in Patent Office: 728 Days
• Field of Search: 123/32 C, 123/32 SP, 123/32 ST, 123/32 K, 123/191 S, 123/191 SP, 123/75 B
• US Class Current: 123/268
• CPC Class Codes: F02B 1/04 with fuel-air mixture admission into cylinder
• CPC Class Codes: F02B 19/12 with positive ignition engines with non-timed positive ignition, and with incandescent chambers F02B9/08
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

An auxiliary combustion chamber shell of an internal combustion engine comprising a main combustion chamber having an intake valve and an exhaust valve, an auxiliary combustion chamber having no intake valve, a passage communicating the main and auxiliary combustion chambers, and an ignition spark plug whose electrode is positioned in the auxiliary combustion chamber. The auxiliary combustion chamber is pressed into a cylinder head to improve radiation effect, and held fast by the ignition spark plug. The auxiliary combustion chamber is divided into a high temperature portion adjacent to the communication passage and a secluded portion opposite the passage where the temperature is relatively low.

Claims

1. An internal combustion engine comprising:

a cylinder;

a cylinder head;

a reciprocable piston snugly received in said cylinder;

said cylinder head and said piston defining a main combustion chamber therebetween;

means defining a blind hole in said cylinder head, the open end of said blind hole opening into said main combustion chamber and the opposite end of said blind hole most remote from said main combustion chamber being completely closed;

an auxiliary combustion chamber shell defining an auxiliary combustion chamber therein, said shell being pressedly fitted in said blind hole from the main combustion chamber so that the entire exterior surface of the auxiliary combustion chamber shell tightly contacts the wall of the blind hole, said auxiliary combustion chamber having no intake valve;

a passage communicating said auxiliary combustion chamber with said main combustion chamber; and

an ignition spark plug having an electrode positioned in said passage whereby a substantially uniform lean fuel-air mixture, drawn into the main combustion chamber through an intake valve on the intake stroke of the piston, is forced into the auxiliary combustion chamber on the compression stroke of the piston and ignited and burned thereby igniting and burning the lean fuel-air mixture in the main combustion chamber by the torch flame via said passage from the auxiliary combustion chamber.

2. An internal combustion chamber as claimed in claim 1, wherein:

said ignition spark plug has a threaded portion thereon screwed into a threaded inner wall of a hole formed in the cylinder head, said plug having its longitudinal axis slanted with respect to the axis of the auxiliary combustion chamber, and part of the threaded portion of said ignition spark plug being engaged with an engaging portion formed in the auxiliary combustion chamber shell so that the shell is held in place by the ignition spark plug.

3. An internal combustion engine as claimed in claim 1 wherein, the auxiliary combustion chamber shell is divided into a plurality of individual sections.

4. An internal combustion engine comprising:

a cylinder head,

a piston,

said cylinder head and the top of said piston defining a main combustion chamber therebetween,

a hole in cylinder head which opens into the main combustion chamber,

a shell defining an auxiliary combustion chamber therein, said shell being pressedly fitted in said hole,

said auxiliary combustion chamber having no intake valve,

a passage communicating said auxiliary combustion chamber with said main combustion chamber, and

an ignition spark plug having a threaded portion, said threaded portion abutting a portion of said shell so that said shell is held in place by the ignition spark plug, and

an electrode of said ignition spark plug positioned in said passage.