US2084142A - Suction operated accessory system - Google Patents

Description

June 15, 1937. E. c. HORTON 2,084,142

SUCTION OPERATED ACCESSORY SYSTEM Filed April 12, 1935 INVENTOR Erwin'Choflon;

NEYS

Patented June 1937 I UNITED s ng SUCTION OPERATED ACCESSORY SYSTEM Erwin 0.. Horton, Hamburg, N. Y., assignor to .Trico Products Corporation, Buffalo, N. Y.

Application April -12, 1935, Serial No. 16,079 2 Claims. (01.123-198) This invention relates to means for producing suction, and has particular reference to means associated with an engine, for example an internal combustion engine, for producing suction which may be utilized for operating devices, such as windshield cleaners on motor vehicles, or for other purposes.

' According to conventional practice the suction used to operate the windshield cleaners and air.

horns of motor vehicles having internal combustion engines is obtained by tapping the intake manifolds or fluid inlet passages of the engines, since the pressure in such manifolds or passages is usually considerably .less than atmospheric.

However, such sub-atmospheric pressure varies from time to time in accordance with the conditions of speed and load of the engine, and the degree of opening of the engine throttle valve; and by reason of the large degree of such variation, this source of suction has been found to be not fully satisfactory.

According to the present invention a tube is extended from the exhaust manifold or passage of the engine to the intake manifold or passage of the engine in such manner that a portion of the exhaust fluid will pass from the exhaust passage into the intake passage, and Venturi means are associated with the tube so that such passing of fluid will effect the production of suction.

0 Since the rate of flow and pressure of fluid in an engine exhaust passage is usually high when the suction influence in the inlet passage is low, and vice versa, the rate of flow of fluid through the 1 tube in the present system is comparatively uniform, and hence the degree of the available suction is likewise comparatively uniform.

These and other objects and advantages of the invention will appear from a perusal of the following description, which is made in accordance with the accompanying drawing, wherein: Fig. 1 is a diagrammaticview of the forward portionof a motor vehicle with the present invention applied thereto;

Fig. 2 is a vertical sectional .view throughthe intake and exhaust manifolds of the vehicle engine shown in Fig. 1;

Fig. 3 is a cross-section taken along line .33 of Fig. 2; and,

Fig. 4 is a. fragmentary sectional view'taken along line 4-4 of Fig. 3.

As shown inFlg. 1, the motor vehicle H) has an internal combustion engine II with a fluid inlet passage including intake manifold i2, and an exhaust passage including exhaust manifold I3 and the connected exhaust pipe It. A windfrom tube mouth l8 of the tube. 10

The tube H, or at least a portion of it, is of Venturi form; that is, it has a restricted throat portion l9 with an aperture 2i extending through the wall thereof into a chamber 22 extending around the tube. Into this chamber 22 15 r the suction conduit l6 opens. 7

During normal operation of the engine the velocity-and pressure of the exhaust gases coming from the engine'- cylinders will force a portion of such gases into the tube I'I. Simultane- 2o ously, a less-than-atmospheric .pressure' maintaining in manifold l2, or the effect of inflowing gases passing the open mouth 23 of the other end of tube II, will effect a withdrawal of fluid i1. through tube I1, by the well known and under;- stood venturic action will effect withdrawal of air from chamber 22 and conduit l6 through aperture 2|. Since the actionof the exhaust gases in forcing themselves into tube 11 will 30 in its tendency to withdraw fluid from the tube, a

and vice versa, ,the quantity and velocity of fluid flow through tube I! will be comparatively uniform, and hence the degree of suction maintaining in chamber 22 likewise will be comparatively uniform and constant.

It will be understood that the dimensions of the portion of tube i'l within'the exhaust mani- 40 fold will be made small enough that excessive back pressure will not build up in the exhaust manifold, and that .the amount of exhaust fluid passed to the engine intake manifold will not materially interfere with operation of the en- 45 gine. It will also. be understood that the him I turi part of tube ll may be placed in portions of the tube outside of the manifold l3, and that the extent of the ends of tube l1 into the mani- The resulting flow of fluid tion engine having a fluid inlet passage end en exhaust fluid passage. 0. Venturi tube including e suction take-ofl.'ssid tube being disposed within the exhaust fluid passa e whereby s portion 5 of the exhaust fluid may pass into the Venturi tube and the remaining exhaust fluid me! pus around the Venturi tube, and a. conduit from the discharge end otthe Venturi tube .to-the fluid inlet passage.

m 2. m eomhination with an'internai eombultion engine havinge.fluidinietxasssitgeemielr hnust maze. theflremalndet of we exhsust' gases passing ubeut the Ventwitube;

IRWIN C. non'rnw

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