Engine temperature control system

Claim 2

An internal combustion engine including a cooling system comprising a coolant jacket having a first portion for cooling of a first part of said engine and a second portion for cooling of a second part of said engine, means for supplying coolant to said first coolant jacket portion, a discharge conduit connected to said second jacket portion for freely discharging coolant from said second coolant jacket portion, by-pass means for affording restricted coolant flow between said first coolant jacket portion and said discharge conduit, and thermostatic valve means connecting said first and second coolant jacket portions for affording coolant flow from said first coolant jacket portion to said second coolant jacket portion when said coolant is above a predetermined temperature and for preventing coolant flow from said first coolant jacket portion to said second coolant jacket portion when said coolant temperature is below said predetermined temperature.

Claim 3

An internal combustion engine in accordance with Claim 1 including one or more cylinders each having a cylindrical portion and head with a spark plug mounted therein and wherein said first engine part includes the area in the vicinity of said cylindrical portion and wherein said second engine part includes the area in the vicinity of said head and said spark plug.

Claim 4

An engine in accordance with claim 1 wherein said predetermined temperature is about 140* F.

Claim 5

An internal combustion engine including a cooling system comprising a coolant jacket having a first portion for cooling of a first part of said engine and a second portion for cooling of a second part of said engine, means for supplying coolant to said first coolant jacket portion, a discharge conduit connected to said second jacket portion for freely discharging coolant from said second coolant jacket portion, by-pass means for affording restricted coolant flow between said first coolant jacket portion and said discharge conduit, and pressure responsive valve means connected between said first and second coolant jacket portions for affording coolant flow from said first coolant jacket portion to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is above a predetermined value and for preventing coolant flow from said first coolant jacket portion to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is below said predetermined value.

Claim 6

An internal combustion engine including a cooling system comprising a coolant jacket having a first portion for cooling of a first part of said engine and a second portion for cooling of a second part of said engine, means for supplying coolant to said first coolant jacket portion, a discharge conduit connected to said second jacket portion for freely discharging coolant from said second coolant jacket portion, by-pass means for affording restricted coolant flow between said first coolant jacket portion and said discharge conduit, and pressure responsive valve means connected between said first and second coolant jacket portions for affording coolant flow from said first coolant jacket portion to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is above a predetermined value and for preventing coolant flow from said first coolant jacket portion to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is below said predetermined value.

Claim 7

An internal combustion engine in accordance with claim 4 including one or more cylinders each having a cylindrical portion and head with a spark plug mounted therein and wherein said first engine part includes the area in the vicinity of said cylindrical portion and wherein said second engine part includes the area in the vicinity of said head and said spark plug.

Claim 8

An internal combustion engine including a cooling system comprising a coolant jacket having a first portion for cooling of a first part of said engine and a second portion for cooling of a second part of said engine, pump means for supplying coolant to said first coolant jacket portion, means for freely discharging coolant from said second coolant jacket portion, by-pass means for affording restricted coolant flow between said first coolant jacket portion and said means for freely discharging coolant, thermostatic valve means connecting said first and second coolant jacket portions for affording coolant flow from said first coolant jacket portion to said second coolant jacket portion when said coolant is above a predetermined temperature and for preventing coolant flow from said first coolant jacket portion to said second coolant jacket portion when said coolant temperature is below said predetermined temperature, and pressure responsive valve means connected between said first and second coolant jacket portions for affording coolant flow from said first coolant jacket portIon to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is above a predetermined value and for preventing coolant flow from said first coolant jacket portion to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is below said predetermined value.

Claim 9

An internal combustion engine including a cooling system comprising a coolant jacket having a first portion for cooling of a first part of said engine and a second portion for cooling of a second part of said engine, pump means for supplying coolant to said first coolant jacket portion, means for freely discharging coolant from said second coolant jacket portion, by-pass means for affording restricted coolant flow between said first coolant jacket portion and said means for freely discharging coolant, thermostatic valve means connecting said first and second coolant jacket portions for affording coolant flow from said first coolant jacket portion to said second coolant jacket portion when said coolant is above a predetermined temperature and for preventing coolant flow from said first coolant jacket portion to said second coolant jacket portion when said coolant temperature is below said predetermined temperature, and pressure responsive valve means connected between said first and second coolant jacket portions for affording coolant flow from said first coolant jacket portIon to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is above a predetermined value and for preventing coolant flow from said first coolant jacket portion to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is below said predetermined value.

Claim 10

An engine in accordance with claim 6 wherein said predetermined temperature is about 140* F.

Claim 11

An internal combustion engine in accordance with claim 6 wherein said pump means for supplying coolant and said by-pass is connected to the bottom of said first coolant jacket portion and wherein said means for freely discharging coolant is connected to the bottom of said second coolant jacket portion.

Claim 12

An internal combustion engine in accordance with claim 6 wherein said thermostatic valve means is located at the bottom of said first coolant jacket portion.

Claim 13

An internal combustion engine in accordance with claim 6 wherein said pressure responsive valve means is located adjacent to the bottom of said first coolant jacket portion.

Claim 14

An engine in accordance with claim 6 wherein said by-pass means is dimensioned so as to accommodate a maximum flow approximately equal to the quantity of coolant supplied by said pump under engine idle speed operation.

Claim 15

An engine in accordance with claim 6 wherein said pump includes a plurality of flexible vanes mounted on a rotating hub.

Claim 16

An internal combustion engine comprising a first engine block member including wall means at least partially defining a first coolant jacket portion connected to a source of coolant, a second engine block member connected to said first engine block member, a third engine block member connected to said second engine block member, said second and third engine block members including wall means defining a second coolant jacket portion, a passage connected to said second coolant jacket portion for discharging coolant from said second coolant jacket portion, means connected between said first and second coolant jacket portions for selectively controlling coolant flow from said first coolant jacket portion to said second coolant jacket portion, and means connected between said first coolant jacket portion and said discharging passage for by-passing a restricted amount of coolant around said second coolant jacket portion and said coolant flow control means from said first coolant jacket portion to said coolant discharging passage.

Claim 17

An internal combustion engine comprising a first engine block member including wall means at least partially defining a first coolant jacket portion connected to a source of coolant, a second engine block member connected to said first engine block member, a third engine block member connected to said second engine block member, said second and third engine block members including wall means defining a second coolant jacket portion, a passage connected to said second coolant jacket portion for discharging coolant from said second coolant jacket portion, means connected between said first and second coolant jacket portions for selectively controlling coolant flow from said first coolant jacket portion to said second coolant jacket portion, and means connected between said first coolant jacket portion and said discharging passage for by-passing a restricted amount of coolant around said second coolant jacket portion and said coolant flow control means from said first coolant jacket portion to said coolant discharging passage.

Claim 18

An internal combustion engine comprising a first engine block member including wall means defining a cylindrical cylinder portion and at least partially defining a first coolant jacket portion extending in heat exchanging relation to said cylindrical cylinder portion and connected to a source of coolant, a second engine block member connected to said first engine block member and including wall means defining a cylinder head portion aligned with said cylindrical cylinder portion, a third engine block member connected to said second engine block member, said second and third engine block members including wall means defining a second coolant jacket portion extending in heat exchanging relation to said cylinder head portion, a passage connected to said second coolant jacket portion for discharging coolant from said second coolant jacket portion, means connected between said first and second coolant jacket portions for selectively controlling coolant flow from said first coolant jacket portion to said second coolant jacket portion, and means connected between said first coolant jacket portion and said discharging passage for by-passing a restricted amount of coolant around said second coolant jacket portion and said coolant flow control means from said first coolant jacket portion to said coolant discharging passage.

Claim 19

An internal combustion engine comprising a first engine block member including wall means defining a cylindrical cylinder portion and at least partially defining a first coolant jacket portion extending in heat exchanging relation to said cylindrical cylinder portion and connected to a source of coolant, a second engine block member connected to said first engine block member and including wall means defining a cylinder head portion aligned with said cylindrical cylinder portion, a third engine block member connected to said second engine block member, said second and third engine block members including wall means defining a second coolant jacket portion extending in heat exchanging relation to said cylinder head portion, a passage connected to said second coolant jacket portion for discharging coolant from said second coolant jacket portion, means connected between said first and second coolant jacket portions for selectively controlling coolant flow from said first coolant jacket portion to said second coolant jacket portion, and means connected between said first coolant jacket portion and said discharging passage for by-passing a restricted amount of coolant around said second coolant jacket portion and said coolant flow control means from said first coolant jacket portion to said coolant discharging passage.

Claim 20

An engine in accordance with claim 14 wherein said means for selectively controlling coolant flow comprises a thermostatic valve means connecting said first and second Coolant jacket portions for affording coolant flow from said first coolant jacket portion to said second coolant jacket portion when said coolant is above a predetermined temperature and for preventing coolant flow from said first coolant jacket portion to said second coolant jacket portion when said coolent temperature is below said predetermined temperature.

Claim 21

An engine in accordance with claim 15 wherein said predetermined temperature is about 140* F.

Claim 22

An engine in accordance with claim 14 wherein said means for selectively controlling coolant flow comprises a pressure responsive valve means connected between said first and second coolant jacket portions for affording coolant flow from said first coolant jacket portion to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is above a predetermined value and for preventing coolant flow from said first coolant jacket portion to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is below said predetermined value.

Claim 23

An engine in accordance with claim 17 and further including an engine driven pump for supplying coolant to said first coolant jacket portion from the source, and wherein said by-passing means and said pressure responsive valve means are dimensioned so that, under engine idle speed operation, said by-passing means will accommodate the coolant flow supplied by said pump and said pressure responsive valve means will remain closed and so that at speeds above engine idle speed, said by-passing means will accommodate flow of only a portion of the coolant supplied by said pump and said pressure responsive valve means will open to accommodate the flow of the remainder of the coolant supplied by said pump.

Claim 24

An internal combustion engine comprising a first member including wall means at least partially defining a first coolant jacket portion connected to a source of coolant, a second member connected to said first member, a third member connected to said second member, said second and third members including wall means defining a second coolant jacket portion, a passage for discharging coolant from said second coolant jacket portion, means for by-passing a restricted amount of coolant from said first coolant jacket portion to said coolant discharging passage, temperature responsive valve means for controlling coolant flow from said first coolant jacket portion to said second coolant jacket portion, said thermostatic valve means affording coolant flow from said first coolant jacket portion to said second coolant jacket portion when said coolant is above a predetermined temperature and preventing coolant flow from said first coolant jacket portion to said second coolant jacket portion when said coolant temperature is below said predetermined temperature, and pressure responsive valve means for controlling coolant flow from said first coolant jacket portion to said second coolant jacket portion, said pressure responsive valve means affording coolant flow from said first coolant jacket portion to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is above a predetermined value and for preventing coolant flow from said first coolant jacket portion to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is below said predetermined value.

Claim 25

An internal combustion engine comprising a first member including wall means at least partially defining a first coolant jacket portion connected to a source of coolant, a second member connected to said first member, a third member connected to said second member, said second and third members including wall means defining a second coolant jacket portion, a passage for discharging coolant from said second coolant jacket portion, means for by-passing a restricted amount of coolant from said first coolant jacket portion to said coolant discharging passage, temperature responsive valve means for controlling coolant flow from said first coolant jacket portion to said second coolant jacket portion, said thermostatic valve means affording coolant flow from said first coolant jacket portion to said second coolant jacket portion when said coolant is above a predetermined temperature and preventing coolant flow from said first coolant jacket portion to said second coolant jacket portion when said coolant temperature is below said predetermined temperature, and pressure responsive valve means for controlling coolant flow from said first coolant jacket portion to said second coolant jacket portion, said pressure responsive valve means affording coolant flow from said first coolant jacket portion to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is above a predetermined value and for preventing coolant flow from said first coolant jacket portion to said second coolant jacket portion when the pressure in the coolant in said first coolant jacket portion is below said predetermined value.

Claim 26

An internal combustion engine in accordance with claim 19 wherein said temperature responsive valve means and said pressure responsive valve means are designed relative to each other and relative to said first coolant jacket portion such that, upon a first increase in engine speed above idle speed, said thermostatic valve means opens, and upon a further increase in engine speed, said pressure responsive valve opens.