Valve mechanism lubrication system for horizontal cylinder overhead valve engine

• US 4,881,496 A
• Filed: 05/20/1988
• Issued: 11/21/1989
• Est. Priority Date: 05/20/1988
• Status: Expired due to Term

• Current Assignee: Tecumseh Power Co (Mueller Industries Incorporated)
• Original Assignee: Tecumseh Products Company
• Inventors: Kronich, Peter G.
• Primary Examiner(s): Wolfe, Willis R.
• Assistant Examiner(s): Macy, M.
• Application Number:
  US07/196,979
• Time in Patent Office: 550 Days
• Field of Search: 123/90.33, 123/90.34, 123/41.86, 123/196 W, 123/196 CP, 184/6.18
• US Class Current: 123/90.33
• CPC Class Codes: F01M 9/06 Dip or splash lubrication
• CPC Class Codes: F01M 9/10 Lubrication of valve gear or auxiliaries
• CPC Class Codes: F01M 9/101 of cam surfaces
• CPC Class Codes: F01M 9/104 of tappets
• CPC Class Codes: F01M 9/105 using distribution conduits
• CPC Class Codes: F02B 2075/027 four
• CPC Class Codes: F02B 2275/34 Lateral camshaft position
• CPC Class Codes: F02B 75/007 having vertical crankshafts
• CPC Class Codes: F02B 75/16 Engines characterised by number of cylinders, e.g. single-cylinder engines F02B75/26 takes precedence
• CPC Class Codes: F02F 1/38 the cylinder heads being of overhead valve type
• CPC Class Codes: F02F 2001/247 the valve stems being orientated in parallel with the cylinder axis
• CPC Class Codes: F02F 2007/0063 Head bolts; Arrangements of cylinder head bolts
• CPC Class Codes: F05C 2201/021 Aluminium

Abstract

A lubrication system for the valve actuating mechanism of an internal combustion engine having a vertical drive shaft and horizontally oriented cylinder includes a rocker box housing the valve actuating mechanism with the valve actuating mechanism including a lower rocker arm and an upper rocker arm each oriented for rocking in a substantially horizontal rocking plane. A push rod cavity communicates at one end with the crankcase and at the other end with the rocker box. A cam shaft gear disposed at a lower end of a vertical cam shaft slings liquid oil from the crankcase through the push rod cavity into the rocker box. A dam is provided for retaining liquid oil in the rocker box at a level which partially submerges the lower rocker arm such that the rocking motion of the lower rocker arm splashes dammed oil to lubricate the valve actuating mechanism.

Claims

1. A lubrication system for the valve actuating mechanism of an overhead valve, horizontal cylinder internal combustion engine comprising:

a crankcase having lubricating oil therein;

a rocker box housing said valve actuating mechanism, said valve actuating mechanism including a lower rocker arm and an upper rocker arm with the lower rocker arm disposed for rocking in a substantially horizontal rocking plane;

a push rod cavity communicating at one end with said crankcase and at another end with said rocker box; and

oil slinger means for slinging liquid oil from said crankcase through said push rod cavity into said rocker box such that the lower rocker arm is at least partially submerged.

2. The lubrication system of claim 1, in which said valve actuating mechanism includes a valve spring reciprocated by the lower rocker arm and positioned such that the valve spring is at least partially submerged in oil in said rocker box.

3. A lubrication system of claim 1, and further including dam means for retaining liquid oil in said rocker box at a level which at least partially submerges the lower rocker arm.

4. The lubrication system of claim 3, in which said dam means is located in said push rod cavity.

5. The lubrication system of claim 4, and further including a cylinder head disposed between said rocker box and said crankcase, a head gasket disposed between said cylinder head and said crankcase, said dam means including said head gasket.

6. The lubrication system of claim 5, in which said head gasket includes an aperture situated in said push rod cavity at a height with respect to the lower rocker arm such that a portion of said head gasket below said aperture comprises said dam means.

7. The lubrication system of claim 3, in which said valve actuating mechanism includes a valve spring reciprocated by the lower rocker arm and positioned such that the valve spring is at least partially submerged in oil in said rocker box.

8. The lubrication system of claim 1, and further including vent means for venting said rocker box to said crankcase.

9. The lubrication system of claim 3, and further including vent means for venting said rocker box to said crankcase.

10. A lubrication system for the valve actuating mechanism of an overhead valve, horizontal cylinder internal combustion engine comprising:

a crankcase having lubricating oil therein;

a camshaft disposed in said crankcase;

a rocker box housing said valve actuating mechanism;

a push rod cavity communicating at one end with said crankcase and at another end with said rocker box; and

oil slinger means for slinging liquid oil from said crankcase through said push rod cavity into said rocker box.

11. The lubrication system of claim 10, in which said oil slinger means includes a cam gear connected to said cam shaft with the cam gear slinging oil centrifugally therefrom.

12. The lubrication system of claim 11, in which said cam gear is disposed for rotation about a substantially vertical axis, said push rod cavity communicating with said crankcase via an oil pickup passageway located adjacent and above the periphery of said cam gear.

13. The lubrication system of claim 12, in which said valve actuating mechanism includes a lower rocker arm and an upper rocker arm with the lower rocker arm disposed for rocking in a substantially horizontal rocking plane.

14. The lubrication system of claim 13, and further including dam means for retaining liquid oil in said rocker box at a level which at least partially submerges the lower rocker arm.

15. The lubrication system of claim 14, and further including vent means for venting said rocker box to said crankcase.

16. The lubrication system of claim 14, in which said dam means is located in said push rod cavity.

17. The lubrication system of claim 16, and further including a cylinder head disposed between said rocker box and said crankcase a head gasket disposed between said cylinder head and said crankcase, said dam means including said head gasket.

18. The lubrication system of claim 14, in which said valve actuating mechanism includes a valve spring reciprocated by the lower rocker arm and positioned such that the valve spring is at least partially submerged in oil in said rocker box.

19. The lubrication system of claim 18, and further including a cylinder head disposed between said rocker box and said crankcase, a head gasket disposed between said cylinder head and said crankcase, said dam means including said head gasket.

20. The lubrication system of claim 19, in which said head gasket includes an aperture situated in said push rod cavity at a height with respect to the lower rocker arm such that a portion of said head gasket below said aperture comprises said dam means.