US1828085A

US1828085A - Crank case ventilator

Info

Publication number: US1828085A
Application number: US268754A
Authority: US
Inventors: Augustine J Syrovy; Robert N Janeway
Original assignee: Chrysler Corp
Current assignee: Old Carco LLC
Priority date: 1928-04-09
Filing date: 1928-04-09
Publication date: 1931-10-20
Anticipated expiration: 1948-10-20

Description

0, 1931- A. J. SYROVY ET AL I 1,828,035

CRANK CASE VENTILATOR Filed April 9, 1928 Patented Oct. 20, 1931 UNITED STATES PATENT OFFItZE AUGUSTINE J'. SYROVY AN 1) ROBERT N. JANEWAY, F DETROIT, MICHIGAN, ASSIGNORS,

IBY MESNE ASSIGNMENTS, TO CHRYSLER CORPORATION, A CORPORATION OF DELA- WARE CRANK CASE VENTILATOR.

Application filed April 9,

l bustion engine whereby the crank case may be kept entirely free from water vapor and vaporized gasoline.

An object of this invention is to provide a crank case ventilator which may be oper- 1. ated by the exhaust gases from the engine.

A further object of this invention is to provide a crank case ventilator which will be exceedingly simple in construction and yet thoroughly eflicient in operation.

Other objects and advantages of this invention will become apparent as the following description proceeds, particularly when reference is had to the accompanying drawings wherein:

Figure 1 is an elevational view of a vehicle engine showing the invention applied to the same; and

Figure 2 is an enlarged detail sectional view of the device shown applied to the engine in Figure 1.

Referring now particularly to the drawings wherein like reference characters designate corresponding parts, indicates generally an internal combustion engine having a crank case 11 and the exhaust manifold 12. The exhaust manifold is bent downwardly at its rear end and is provided with the flange 13 for attachment in any suitable manner to the flanged end 14 of a substantially verti cally extending conduit 15 which forms the continuation of the exhaust manifold for conducting the exhaust gases to the muffler (not shown). As clearly shown in Figure 1 the crank case is provided with the valve cover plates 16 according to the usual practice.

The invention contemplates the utilizationof the flow of exhaust gases through the exhaust manifold to create a suction in an ejector conduit and further contemplates the transmission of this suction to the crank case to remove the undesirable gases from the crank case. Accordingly there is provided a tube or conduit 17 which opens laterally into the crank case 11 through one of the cover plates 16 as through a packed fitting 18.

1928-. Serial No. 268,754.

The tube or conduit 17 extends rearwardly toward the vertical portion 15 of the exhaust manifold where it is connected in any suitable manner to. a short section of tubing 19 mounted in the wall of the exhaust manifold. The connection between the conduit 17 and tubing 19 may be effected by a gland 20 and nipple 21 as clearly illustrated in Figure 2 of the drawings. the exhaust manifold so that its outlet end 22 lies substantially centrally of the vertical portion 15 of the exhaust manifold and opens in the direction of flow of the exhaust gases through the said exhaust manifold.

To increase the velocity of the flow of the exhaust gases past the outlet 22 of the tube 19 there is provided a member forming a Venturi passage around the free end of the tube 19. This member preferably comprises a sheet steel tube 23 shaped to form a Venturi passage and provided at one end with the.

flange 24: adapted to be received between the flanges 13 and 14- which join the two sections of the exhaustmanifold to each other. The tube 23 is so positioned with respect to the tube 19 that its portion 25 which forms the throat of the Venturi passage surrounds the outlet 22 of the tube 19.

It has been found that the Venturi passage, although fairly eflicient has definite limitations as an ejector when applied to the engine.

exhaust. As the throat diameter is decreased not only does the pressure at the throat tend to diminish but also the pressure ahead of the venturi tends to increase. It has been found in. this case that when the diameter of the throat of the Venturi passage is about of the inlet diameter of the pressure the pres sure at the throat reaches a minimum and the invention therefore contemplates the shaping of the tube 23 in such a manner that the throat of the Venturi passage will assume substantially this proportion to the inlet diameter of the Venturi passage.

It has also been found that a considerable velocity gradient exists across the passage diameter, the velocity being greatest at the center and least at the walls. Accordingly therefore, the invention contemplates the arrangement of the outlet end 22 of the tube 19 The tube 19 is bent within.

at the center of the throat of the Venturi passage so that the outlet end of the tube is thus exposed to the maximum velocity of the exhaust gases.

From the above, it is believed that the operation of the device will be clearly apparent. The exhaust gases flowing through the exhaust manifold will have their velocity increased by the Venturi passage and will thus create a considerable suction in the tube 19. This suction will be transmitted through the tube 17 to the crank case 11 to draw fresh air through the said crank case thereby removing ases and water vapor which might tend to lute the oil within the crank case and rust the adjacent motor parts.

It will thus be apparent that the invention provides simple and positive means for withdrawing the undesirable gases from the crank case and that the structure may be applied to practically any internal combustion engine of standard construction. While one embodiment of the invention has been described considerably in detail, it is to be clearly understood that the description is for the purpose of illustration only and that the right is therefore reserved to make such changes in the details of construction and arrangement of parts as will fall within the purview of the attached claims.

WV hat we claim as 1. In a crank case our invention is: ventilator, a crank case, an exhaust manifold, a conduit for withdrawing gases from the said crank case and discharging the same into the said exhaust manifold, the said conduit having its inlet end communicating with the said crank case and its outlet end within the said exhaust manifold and opening in the direction of flow of the exhaust gases through the said manifold, and means for increasing the velocity of the flow of the exhaust gases within the said manifold as they pass the outlet end of the said conduit to increase the suction within the said conduit, said means including a sheet metal tubular member clamped within said exhaust manifold and forming a Venturi passage therein adjacent the outlet end of the said conduit.

2. In a crank case ventilator, a sectional crank case, an exhaust manifold, a member within the said exhaust manifold forming a Venuri passage, said member having a flange clamped between thesections of the manifold and a conduit having its inlet end communicating with the said crank case and its outlet end within the said exhaust manifold and arranged centrally of the throat of the Venturi passage formed therein, the outlet opening of the said conduit being arranged to face in the direction of flow of the exhaust gases through the said exhaust manifold.

3. In a crank case ventilator, a crank case, an exhaust manifold, a member within the said exhaust manifold forming a Venturi pastures.

AUGUSTINE J. SYROVY. ROBERT N. JANEWAY.