US1977518A

US1977518A - Air inlet for internal combustion motors

Info

Publication number: US1977518A
Application number: US675788A
Authority: US
Inventors: Mallory Marion
Original assignee: Mallory Research Co
Current assignee: Mallory Research Co
Priority date: 1933-06-14
Filing date: 1933-06-14
Publication date: 1934-10-16
Anticipated expiration: 1951-10-16

Description

Oct. 16, 1934; M Y 1,977,518

AIR INLET FOR INTERNAL COMBUSTION MOTORS Filed June 1 4'. 19 3s Patented @ct. 116, Edg

iyuai lhtillhiilltl A1113, HNLIET Mild CEMEBNUSTIMN I/JIQ'JIGUJRS This invention relates to a device for aitting air to the manifold of an internal combustion motor, and particularly to means for automatically controlling such admission in response to certain operating conditions. In driving the usual automobile, whenever the throttle is closed to reduce the speed of travel, either with or with out the application of the brakes, the continued operation of the motor driven by its own momen- W tum, and also by the momentum of the automobile if free wheeling is not used, creates a comparatively high vacuum in the manifold. This sucks in considerable gasoline through the idling well, and also oil from the crank case, without 6 sumcient air for complete combustion. Thus, gasoline and oil are wasted and an excessive amount of carbon monoxide is emitted from the exhaust.

The object of the present invention is to imfiil prove upon the above-mentioned condition by supplying auxiliary air to the manifold under the conditions stated. It is, therefore, expedient to provide inertia controlled means for opening the auxiliary air valve, but at the same time the 3d auxiliary air valve should be positively prevented from opening, whenever the throttle valve is open.

My invention and the advantages resulting therefrom will be more particularly explained in connection with the accompanying drawing, in 3b which Figure 1 is a sectional View of the invention as applied to the intake manifold; Fig. 2 is a similar View of a. modified form of the invention; Fig. 3 is a fragmentary view of a mercury switch which 35 may be used in place of the inertia controlled switch shown in Fig. 2.

As illustrated in the drawing, the invention is associated with a manifold 5 having an intake passageway 6 within which is a throttle valve 7 40 having an arm 8 connected to a throttle control rod 9. An air inlet nipple 1.0 is connected to the intake passageway 6. The outer end of the nipple 10 is connected with a valve housing 11, pref erably in the form of a cylinder, within which is a piston valve 12 normally closing a port 13, which leads to the nipple 10 and thence to the intake passageway 6. The lower end of the housing 11 has an annular head 14 with a comparatively large opening 15, which isnormlly covered 60 by the piston valve 12, the latter being held against its seat by a spring 16. A passageway 17 leads from the upper end of the housing 11 into the manifold 5 at a point remote from the point at which the nipple 10 is connected to the intake 55 passageway 6. The interior of the housing 11 is provided with a circumferential channel 13 ad jacent the port 13, so that the suction from the intake passageway 6 will not cause the valve 12 to freeze to the wall of the cylindrical housing 11. As shown in l, the passageway 17 between the upper end of the housing 11 and the manifold 5, is normally closed by a transversely disposed valve 13. The bifurcated outer end of this valve 19 has a suitable connection 20 with a pendant or pendulum 21 which is pivotally supported at 22 from an extension of the housing 11, and has at its lower end a weight or bob 23, which is adapted to move forwardly by its own inertia whenever the car, travelling in the direction of the arrow in Fig. 1, is decelerated. As the. hob or weight 23 thus moves forwardly, the valve 19 is shifted until the reduced portion 24 thereof registers with the passageway 17 and places the interior of the valve housing 11 in co itll unic'ation with the manifold 5. At this time, if the throttle 7 is closed, r553 the vacuum created in the manifold 5 will raise the piston valve 12, uncovering the port 13, so that auxiliary air will be admitted through the port 15 and nipple 10 to the intake passageway 6. The bob 23 may be provided with an adjustable stop 25 to limit its forward movement. If the car should be on a down grade, it isapparent that therewill be a tendency for the bob 23 to move forwardly under the influence of gravity to open the valve 19. In order that there may be no difi'lculty in starting or accelerating the motor under such conditions, a lever 26 is fulcrumed at 27 on the housing 11 and is connected to the throttle rod 9. The upper end 28 of this lever is in such a position that the opening of the throttle will cause itto kick the bob 23 rearwardly and positively close the valve 19, so that the valve 12 will remain closed and no auxiliary air will be admitted to the manifold. 95 In the modification in Fig. 2, the valve 29, when seated, closes the passageway 17 and is normally held to its seat by a spring 30. The opening movement of this valve is effected by a solenoid 31 when the latter is energized and the possible opening. movement of the valve is limited by an adjustable screw 32. The energization of the solenoid 31 is controlled by a pendulum 33, similar to the penbit ' dulum 21, and provided with a switch 34 which is closed by the inertia when the car is decelerated. There is also a switch 35 in the solenoid circuit, the contact points 36 of the switch being urged toward open position by a spring 37. The throttle rod 9, however, is provided with a shoulder 38 which engages a finger 39 on the switch to posi- 1m tively close the latter when the throttle 7 is closed. When the car is being decelerated, therefore, with the throttle closed, a circuit is established from the battery 40 through wire 41 to the solenoid 31, thence through wire 42, switch 35, wire 43 and switch 34 to the grounded side of the battery. It will be understood, of course, that the solenoid circuit is connected to the wiring system at the negative side of the ignition switch.

As illustrated in Fig. 3, a mercury switch 44 may be substituted for the pendulum 33, one side of this switch being grounded, as shown at 45, and the other side being connected by a wire 46 to the solenoid circuit.

From the foregoing description, it will be seen that the invention provides inertia controlled means for admitting auxiliary air to the intake manifold whenever the car is being decelerated with the throttle closed. Means connected with the throttle rod, however, positively prevents the admission of such auxiliary air when the throttle is open, even though the car is on a down grade.

While I have shown and described various means of effecting the desired results, it is to be understood that these are merely for the purpose of illustration and that the invention includes all such other modifications as may fall within the scope of the appended claims.

What is claimed is:

1. The combination with an automobile motor having an intake manifold with an air inlet port and a valve normally closing said port but adapted to be opened by suction from said manifold induced by a predetermined degree of vacuum therein, of inertia controlled means for rendering said suction ineffective unless the speed of travel is decreasing.

2. The combination with an automobile motor having an intake manifold with an air inlet port and a valve normally closing said port but adapted to be opened by suction from said manifold induced by a predetermined degree of vacuum therein, of a second valve normally in a position to.cut off the first mentioned valve from the influence of the suction which tends to open it, inertia controlled means to move the second valve from its normal position to subject the first mentioned valve to such influence when the speed of travel is decreasing, and means operable in conjunction with the throttle valve of the motor to hold said second valve positively closed whenever the throttle valve is open.

, 3. The combination with an automobile motor having an intake manifold with an air inlet port and a second port at a. distance therefrom, and a valve normally covering said air inlet port but operable by suction through the second port to admit atmospheric air to the air inlet port, of a second valve normally closing communication between the second port and the first mentioned valve, and inertia controlled means automatically operable to open said second valve only if the speed of travel is decreasing.

4, The combination with an automobile motor having an intake manifold, of a valve chamber with two passageways leading therefrom into the manifold, said chamber having also an atmospheric port, a valve normally covering said atmospheric port and operable by suction from the manifold through one of said passageways to open communication from said port to the second passageway, a second valve associated with the first passageway and normally closedlto cut off theflrst mentioned valve from the influence of suction in the manifold, and inertia controlled means automatically operable to open the second valve only if the speed of travel is decreasing.

5. The combination with an automobile motor having an intake manifold with an air inlet port and a valve normally closing said port, of means including a weighted pendant, normally responsive only to a decrease in the traveling speed of the automobile, to render said valve subject to the sub-atmospheric pressure of the manifold in a manner tending to open the valve.

6. The combination with an automobile motor having a throttle, an intake manifold with an air inlet port and a. valve normally closing said port, but adapted to be opened by suction from said manifold induced by a predetermined degree of vacuum therein, of inertia controlled means for rendering said suction efiective only when the throttle is closed and the speed of travel is decreasing.

7. The combination with the intake manifold and throttle of an automobile motor, of inertia controlled means to admit air to said manifold as the speed of travel is decreasing with the throttle closed, and means connected with the throttle to oppose forward movement of the inertia controlled means when the throttle is open. I

8. The combination with the intake manifold and throttle of an automobile motor, of a weighted pendant, means actuated by a relative forward movement of said pendant to admit air to said manifold, and means to positively prevent such relative forward movement when the throttle is open.

9. The combination with an automobile motor having a throttle, an intake manifold with an air inlet port and a valve normally closing said port, but adapted to be opened by suction from said manifold induced by a predetermined degree of vacuum therein, a second valve normally in a position to cut off the first mentioned valve from the influence of the suction which tends to open it, and inertia controlled means, operable only when the throttle is closed to move the second valve from its normal position to subject the first mentioned valve to such influence when the speed of travel is decreasing.

10. The combination with an automobile motor having a throttle and an intake manifold with an air inlet port and a second port at a distance therefrom, of a valve normally covering said air inlet port but operable by suction through the second port to admit atmospheric air to the air inlet port, a second valve normally closing communication between the second port and the first mentioned valve, inertia controlled means automatically operable to open said second valve when the speed of travel is decreasing, and means to render the inertia controlled means inoperative if q the throttle is open.

11. The combination with an automobile motor having a throttle and an intake manifold, of a. valve chamber with two passageways leading therefrom into the manifold, said chamber having also an atmospheric port, a valve normally covering said atmospheric port and operable by suction from the manifold through one of said passageways to open communication from said port to the second passageway, a second valve associated with 145 the first passageway and normally closed to cut off the first mentioned valve from the influence of suction in the manifold, inertia controlled means automatically controlled to open the second valve only if the speed of travel is decreasing, and means 5 to render the inertia controlled meansinoperative if the throttle is open.

12. The combination with an automobile motor having a throttle and an intake manifold with an air inlet port and a valve normally closing said port, of means including a weighted pendant, normally responsive to a decrease in the traveling Mil