Abstract:
An exhaust device for an engine cam include a flow rectifying device for rectifying a flow of an exhaust gas. The flow rectifying device is disposed in an upstream end of an inner pipe, and comprises protrusions projecting inwardly. The exhaust gas engaging the flow rectifying device has passed through a curved portion of the inner pipe. The inner pipe also includes a muffler having a plurality of vent holes disposed in an inner portion thereof, and an outer pipe surrounding the inner pipe, defining an angular chamber therebetween.

Description:
BACKGROUND 
       [0001]    1. Field 
         [0002]    The present invention relates to an exhaust device for an engine which has a muffler connected to an exhaust pipe having a curved portion or a bent portion. 
         [0003]    2. Description of the Related Art 
         [0004]    Exhaust devices for engines in which the downstream portion of an exhaust pipe connected to a muffler is curved are already known from documents such Patent Document 1, Japanese Patent Laid-Open No. 2001-227336. 
         [0005]    If the curved or bent downstream portion of the exhaust pipe develops a pressure distribution such that the pressure of the exhaust gas in the muffler changes circumferentially, then the pressure of the exhaust gas in the muffler tends to become unbalanced, failing to sufficiently deliver the engine output. 
         [0006]    As disclosed in Patent Document 1, in a muffler having an annular chamber defined between inner and outer pipes and filled with an acoustic absorbent such as glass wool or the like, the unbalanced pressure of the exhaust gas in the inner pipe may possibly cause an unbalanced deterioration of the acoustic absorbent, tending to shorten the interval for replacing the acoustic absorbent. 
       SUMMARY 
       [0007]    The present invention has been made in view of the above drawbacks. It is an object of the present invention to provide an exhaust device for an engine which is capable of sufficiently delivering the engine output by rectifying an exhaust gas flow regardless of the fact that the exhaust pipe has a curved portion or a bent portion. 
         [0008]    In one embodiment, and exhaust device for an engine includes a flow rectifying means for rectifying a flow of an exhaust gas. The flow rectifying means is disposed in an upstream end of the inner pipe. The flow rectifying means comprises protrusions projecting inwardly. Exhaust gas engaging the flow rectifying means has passed through a curved portion of the exhaust pipe, and the exhaust pipe also includes a muffler having a plurality of vent holes disposed in an inner portion thereof, and an outer pipe surrounds the inner pipe, thereby defining an angular chamber therebetween. 
         [0009]    In another embodiment, an exhaust device for an engine comprises an exhaust pipe having an inner surface thereof and a curved portion configured to be attached to the engine at an upstream portion thereof. The exhaust pipe is also configured to be attached to a muffler at a downstream portion thereof. A protrusion projects inwardly from an inner surface of the exhaust pipe. The protrusion is disposed downstream of the curved portion. The protrusion is configured to rectify flow of an exhaust gas which has passed through the curved portion. 
         [0010]    In yet another embodiment, an exhaust device for an engine comprises an exhaust pipe having a curved portion at one end thereof, with the curved portion being configured to be attached to an engine, with the exhaust pipe also configured to be attached to a muffler at a downstream end thereof. The muffler comprises an inner pipe having a number of vent holes thereupon and an outer pipe surrounding the inner pipe, thereby defining an angular chamber between the outer pipe and the inner pipe. At least one flow rectifying protrusion is disposed on an inner surface of an upstream end of the inner pipe. The protrusion is configured to rectify flow of exhaust gas which has passed through the curved portion. 
         [0011]    In another embodiment, an exhaust device for an engine comprises an exhaust pipe having a curved portion at an upstream end thereof, and at least one flow rectifying protrusion projecting inwardly from an inner surface of the exhaust pipe. The flow rectifying protrusion is disposed downstream of the curved portion. The protrusion is configured to rectify a flow of an exhaust gas which has passed through the curved portion. 
         [0012]    To achieve the above object, the present invention can have a first feature providing an exhaust device for an engine which has a muffler connected to an exhaust pipe having a curved portion or a bent portion, wherein the muffler includes an inner pipe having a number of vent holes and having an upstream end coupled to the exhaust pipe, and an outer pipe surrounding the inner pipe with an annular chamber defined between the inner pipe and the outer pipe, wherein flow rectifying means having protrusions projecting inwardly from an inner surface of the upstream end of the inner pipe is disposed in the upstream end of the inner pipe such that the protrusions rectify the flow of an exhaust gas which has passed through the bent portion or the curved portion of the exhaust pipe. 
         [0013]    In addition to the arrangement of the first feature, the present invention can have a second feature in that the flow rectifying means includes a first flow rectifying member fixed to the inner surface of the inner pipe and a second flow rectifying member fixed to the inner surface of the inner pipe downstream of the first flow rectifying member, the first and second flow rectifying members having the protrusions projecting integrally therewith inwardly from the upstream end of the inner pipe. 
         [0014]    In addition to the arrangement of the second feature, the present invention can have a third feature in that the protrusion is tilted so as to be progressively spaced from the inner surface of the inner pipe downstream with respect to the direction in which the exhaust gas flows through the inner pipe, and the distance between the projecting end of the protrusion and the inner surface of the inner pipe in a region where a pressure distribution of the exhaust gas in the inner pipe exhibits a highest pressure is greater than the distances at other portions of the projecting end. 
         [0015]    In addition to the arrangement of the second or third feature, the present invention has a fourth feature in that the first and second flow rectifying members have an arcuate cross-sectional shape in a plane perpendicular to the axis of the inner pipe. 
         [0016]    The present invention has a fifth feature providing an exhaust device for an engine which has a muffler connected to an exhaust pipe having a curved portion or a bent portion, wherein flow rectifying means having a protrusion projecting inwardly from an inner surface of the exhaust pipe downstream of the curved portion or the bent portion is disposed in the exhaust pipe such that the protrusion rectifies the flow of an exhaust gas which has passed through the curved portion or the bent portion. 
         [0017]    In addition to the arrangement of any one of the first through fifth features, embodiments of the present invention can have a sixth feature in that the flow rectifying means is disposed downstream of the curved portion or the curved portion outwardly of the curved direction or the bent direction. 
         [0018]    According to the first feature of the present invention, even though the exhaust pipe has the curved portion or the bent portion in its downstream portion for developing a pressure distribution such that the pressure of the exhaust gas in the muffler at the upstream end of the inner pipe changes circumferentially, since the flow rectifying means having protrusions projecting inwardly from the inner surface of the inner pipe in a region where a pressure distribution of the exhaust gas in the inner pipe exhibits a highest pressure is disposed in the upstream end of the inner pipe such that the protrusions rectify the flow of an exhaust gas, the pressure of the exhaust gas in the inner pipe is uniformized and the flow of the exhaust gas is made smooth, thus increasing the engine output. Even if the annular chamber between the inner pipe and the outer pipe is filled an acoustic absorbent, the acoustic absorbent will not suffer an unbalanced deterioration, and will be replaced at an extended interval. 
         [0019]    According to the second feature of the present invention, since the flow rectifying means includes a first flow rectifying member and a second flow rectifying member disposed downstream of the first flow rectifying member, the flow of the exhaust gas is mainly rectified by the second flow rectifying member when the engine is in a low rotational speed range and the exhaust gas flows at a low speed, and the flow of the exhaust gas is mainly rectified by the first flow rectifying member when the engine is in a high rotational speed range and the exhaust gas flows at a high speed. Thus, the flow rectifying means provides a flow rectifying capability in a wide range of engine loads for increasing the engine output. 
         [0020]    According to the third feature of the present invention, since the protrusion of the flow rectifying means is tilted so as to be progressively spaced from the inner surface of the inner pipe downstream with respect to the direction in which the exhaust gas flows through the inner pipe, and the distance between the projecting end of the protrusion and the inner surface of the inner pipe in a region where the pressure is highest is greater than the distances at other portions of the projecting end, the pressure of the exhaust gas is effectively uniformized and the flow of the exhaust gas is made smooth. 
         [0021]    According to the fourth feature of the present invention, since the first and second flow rectifying members have an arcuate cross-sectional shape in a plane perpendicular to the axis of the inner pipe, any increase in the resistance to the flow in the inner pipe is minimized. 
         [0022]    According to the fifth feature of the present invention, even though the exhaust pipe has the curved portion or the bent portion for developing a pressure distribution such that the pressure of the exhaust gas in the exhaust pipe changes circumferentially, since flow rectifying means having a protrusion projecting inwardly from an inner surface of the exhaust pipe downstream of the curved portion or the bent portion in a region where a pressure distribution of the exhaust gas exhibits a highest pressure is disposed in the exhaust pipe such that the protrusion rectifies the flow of an exhaust gas, the pressure of the exhaust gas in the exhaust pipe is uniformized and the flow of the exhaust gas is made smooth for increasing the engine output. 
         [0023]    According to the sixth feature of the present invention, since the flow rectifying means is disposed outwardly of the curved direction or the bent direction, the flow rectifying means can effectively be disposed in the region where the pressure distribution of the exhaust gas exhibits the highest pressure. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0024]      FIG. 1  is a left-hand side elevational view of a two-wheeled motorcycle according to embodiment 1. 
           [0025]      FIG. 2  is a plan view as seen in the direction indicated by the arrow  2  in  FIG. 1 . 
           [0026]      FIG. 3  is an enlarged horizontally sectional plan view as seen in the direction indicated by the arrow  3  in  FIG. 2 . 
           [0027]      FIG. 4  is an enlarged view of a portion indicated by the arrow  4  in  FIG. 3 . 
           [0028]      FIG. 5  is a cross-sectional view taken along line  5  to  5  of  FIG. 3 . 
           [0029]      FIG. 6  is a cross-sectional view taken along line  6  to  6  of  FIG. 3 . 
           [0030]      FIG. 7  is a view illustrative of exhaust gas flows in an exhaust pipe and an inner pipe. 
           [0031]      FIG. 8  is a horizontally sectional plan view corresponding to  FIG. 3 , showing embodiment 2. 
           [0032]      FIG. 9  is a plan view showing a portion of an exhaust device according to embodiment 3. 
       
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0033]    Embodiments of the present invention will be described below with reference to the accompanying drawings. 
         [0034]    Embodiment 1 of the present invention will be described, with reference to  FIGS. 1 through 7 . As shown in the example of  FIG. 1 , a two-wheeled motorcycle has a body frame F including a head pipe  13  on which there are steerably supported a front fork  11  that supports a front wheel WF and a steering handle  12  coupled to an upper portion of the front fork  11 . A main frame  14  extends rearwardly and downwardly from the head pipe  13 , and a pair of right and left central frames  15  extending downwardly from a rear portion of the main frame  14 . A pair of right and left pivot plates  16  are mounted respectively on the lower ends of the central frames  15 , and a down frame  17  is disposed below a front portion of the main frame  14  and extend downwardly from the head pipe  13 . A pair of right and left lower frames  18  interconnects a lower portion of the down frame  17  and the pivot plates  16 , and a pair of right and left seat rails  19  extend rearwardly and upwardly from a rear portion of the main frame  14 . A pair of right and left rear frames  20  interconnect intermediate portions of the seat rails  19  and the pivot plates  16 . 
         [0035]    A front fender  21  which covers the front wheel WF from above can be mounted on the front fork  11 . A rear wheel WR is supported by a shaft on a rear end portion of a swing arm  22  having a front end vertically swingably mounted on the pair of right and left pivot plates  16  by a support shaft  23 . A link mechanism  24  is interposed between the pivot plates  16  and the rear fork  22 , and a rear cushion  25  is interposed between the link mechanism  24  and front portions of the seat rails  19 . 
         [0036]    As also shown in  FIG. 2 , a fuel tank  26  is mounted on a front portion of a pair of right and left main frame  14 . A rider seat  27  can be disposed rearwardly of the fuel tank  26  and supported by the seat rails  19 . A rear fender  28  is joined to the rear end of the rider seat  27 . 
         [0037]    An engine E has an engine body  30  disposed in a region surrounded by the main frame  14 , the central frames  15 , the pivot plates  16 , the down frames  17 , and the lower frames  18 , and supported by the body frame F. In this example, the engine body  30  has a cylinder head  31  having a rear side wall to which there is connected a carburetor  33  of an intake device  34  which has an air cleaner  32  at an upstream end thereof. The cylinder head  31  has a front side wall to which there is connected an exhaust pipe  36  of an exhaust device  37  having on its downstream end a muffler  35  that is disposed on the right-hand side of the rear wheel WR. The exhaust pipe  36  is disposed such that it extends slightly forwardly from the front side wall of the cylinder head  31 , is then curved to the right of the cylinder head  31 , and extends on the right-hand side of the cylinder head  31  rearwardly to the muffler  35 . The exhaust pipe  36  includes a curved portion  36   a  in its downstream portion which is curved so as to protrude outwardly and be positioned upwardly in the rearward direction. 
         [0038]    As shown in  FIG. 3 , the muffler  35  includes an inner pipe  39  having an upstream end connected to the exhaust pipe  36  and having a number of vent holes  42  defined therein, an outer pipe  40  surrounding the inner pipe  39  with an annular chamber  43  defined between the inner pipe  39  and the outer pipe  40 , and an acoustic absorbent  41  such as glass wool or the like which fills up the annular chamber  43 . 
         [0039]    A cup-shaped front cover  44  is fixed to the front end of the outer pipe  40  to close the front portion of the outer pipe  40 . The exhaust pipe  36  has a downstream portion extending centrally through the front cover  44 . The front end of the front cover  44  is welded to the outer circumferential surface of the exhaust pipe  36  fully therearound. The outer pipe  40  has a rear end to which there is fixed a cup-shaped rear cover  45  that closes a rear portion of the outer pipe  40 . An end pipe  46  which is open rearwardly has a downstream end fixed centrally to the rear cover  45 . 
         [0040]    The inner pipe  39  has an upstream end press-fitted in the downstream end of the exhaust pipe  36  and a downstream end in which the upstream end of the end pipe  46  is press-fitted. A separator  47  which supports the inner circumferential surface of the downstream end of the inner pipe  39  has an outer circumferential surface fastened to the rear end of the outer pipe  40  and the rear cover  45  by a plurality of rivets  48 . The separator  47  has, in this embodiment, a plurality of through holes  49  defined therein. 
         [0041]    The curved portion  36   a  is provided in the downstream portion of the exhaust pipe  36  and is curved so as to protrude outwardly and be positioned upwardly in the rearward direction. The curved portion  36   a  develops a pressure distribution in the upstream end of the inner pipe  39  such that the pressure of an exhaust gas changes circumferentially to produce a highest pressure outwardly of the curved direction of the curved portion  36   a.  In Embodiment 1, a pressure distribution such that the pressure is highest on the right-hand side of the inner pipe  39  with respect to the lateral direction of the two-wheeled motorcycle is developed in the upstream end of the inner pipe  39 . According to certain embodiments of the present invention, a flow rectifying device or means  50  has protrusions  51   b,    52   b  which project inwardly from an inner surface of the inner pipe  39  in a region where a pressure distribution of the exhaust gas in the upstream end of the inner pipe  39  downstream of the curved portion  36   a  exhibits a high pressure, i.e., outwardly of the curved direction of the curved portion  36   a  (on the right-hand side in Embodiment 1). The flow rectifying means  50  is disposed in the upstream end of the inner pipe  39 , and the protrusions  51   b,    52   b  rectify the flow of the exhaust gas. 
         [0042]    As also shown in  FIGS. 4 through 6 , the flow rectifying means  50  includes a first flow rectifying member  51  fixed to the inner surface of the upstream end of the inner pipe  39  and a second flow rectifying member fixed to the inner surface of the inner pipe  39  downstream of the first flow rectifying member  51 . 
         [0043]    In this embodiment, the first flow rectifying member  51  includes a base  51   a  fixed to the inner surface of the inner pipe  39  and the protrusion  51   b  projecting inwardly from the inner surface of the inner pipe  39  and integrally joined to the rear end of the base  51   a.  The second flow rectifying member  52  includes a base  52   a  fixed to the inner surface of the inner pipe  39  and the protrusion  52   b  projecting inwardly from the inner surface of the inner pipe  39  and integrally joined to the rear end of the base  52   a.  The first and second flow rectifying members  51 ,  52  have an arcuate cross-sectional shape in a plane perpendicular to the axis of the inner pipe  39 . The protrusions  51   b,    52   b  are tilted so as to be progressively spaced from the inner surface of the inner pipe  39  downstream with respect to the direction in which the exhaust gas flows through the inner pipe  39 . 
         [0044]    The distance between the projecting end of the protrusion  51   b  of the first flow rectifying member  51  and the inner surface of the upstream end of the inner pipe  39  in the region where the pressure distribution of the exhaust gas exhibits the highest pressure, i.e., the inner surface outward of the curved direction of the curved portion  36   a,  or the right-hand surface of the inner surface of the upstream end of the inner pipe  39  (the left-hand surface in  FIG. 5 ) in Embodiment 1, is greater than the distances between the other portions of the projecting end and the inner surface of the inner pipe  39 . 
         [0045]    Specifically, the length of the projecting end of the protrusion  51   b  of the first flow rectifying member  51  from the base  51   a  is greatest at a circumferentially central portion of the protrusion  51   b  and is progressively smaller toward circumferentially opposite ends thereof. The first flow rectifying member  51  is fixed to the inner surface of the inner pipe  39  such that the circumferentially central portion of the protrusion  51   b  is disposed in the region where the pressure distribution of the exhaust gas exhibits the highest pressure. Consequently, the distance LA between the projecting end of the protrusion  51   b  in the region where the pressure distribution of the exhaust gas exhibits the highest pressure, i.e., the projecting end of the circumferentially central portion of the protrusion  51   b , and the inner surface of the inner pipe  39  is greatest, and the distance LB between the projecting ends of the circumferentially opposite ends of the protrusion  51   b  and the inner surface of the inner pipe  39  is smallest. 
         [0046]    As shown in  FIG. 7 , whereas the first flow rectifying member  51  is disposed so as to allow the exhaust gas to flow smoothly when the engine E is in a high rotational speed range, the second flow rectifying member  52  is disposed so as to exist in the flow of the exhaust gas that is deflected by the first flow rectifying member  51  when the engine E is in a low rotational speed range. When the engine E is in a high rotational speed range, the second flow rectifying member  52  minimizes its resistance to the exhaust gas, and when the engine E is in a low rotational speed range, the second flow rectifying member  52  presents a sufficient resistance to the exhaust gas. 
         [0047]    Some advantages of Embodiment 1 will be described below. Even though the exhaust pipe  36  has the curved portion  36   a  in its downstream portion for developing a flow speed distribution such that the flow speed of the exhaust gas in the muffler  35  at the upstream end of the inner pipe  39  changes circumferentially, since the flow rectifying means  50  having protrusions  51   b,    52   b  projecting inwardly from the inner surface of the inner pipe  39  in the region where the pressure distribution of the exhaust gas exhibits the highest pressure is disposed in the upstream end of the inner pipe  39  such that the protrusions  51   b,    52   b  rectify the flow of the exhaust gas, the pressure of the exhaust gas in the inner pipe  39  is uniformized and the flow of the exhaust gas is made smooth, thus increasing the engine output. Even though the annular chamber  43  between the inner pipe  39  and the outer pipe  40  is filled the acoustic absorbent  41 , the acoustic absorbent  41  will not suffer an unbalanced deterioration, and will be replaced at an extended interval. 
         [0048]    Furthermore, since the flow rectifying means  50  is disposed in the upstream end of the inner pipe  39  with the protrusions  51   b,    52   b  projecting inwardly from the inner surface of the inner pipe  39  outwardly of the curved direction of the curved portion  36   a  (on the right-hand side in Embodiment 1) of the exhaust pipe  36 , the flow rectifying means  50  can effectively be disposed in the region where the pressure distribution of the exhaust gas exhibits the highest pressure. 
         [0049]    Moreover, since the flow rectifying means  50  includes the first flow rectifying member  51  and the second flow rectifying member  52  disposed downstream of the first flow rectifying member  51 , the flow of the exhaust gas is mainly rectified by the second flow rectifying member  52  when the engine E is in a low rotational speed range and the exhaust gas flows at a low speed, and the flow of the exhaust gas is mainly rectified by the first flow rectifying member  51  when the engine E is in a high rotational speed range and the exhaust gas flows at a high speed. Thus, the flow rectifying means can provide a flow rectifying capability in a wide range of engine loads for increasing the engine output. 
         [0050]    Since the protrusion  51   b  of the first flow rectifying member  51  of the flow rectifying means  50  is tilted so as to be progressively spaced from the inner surface of the inner pipe  39  downstream with respect to the direction in which the exhaust gas flows through the inner pipe  39 , and the distance LA between the projecting end of the protrusion  51   b  and the inner surface of the inner pipe  39  in the region where the pressure is highest is greater than the distances between the other portions of the projecting end and the inner surface of the inner pipe  39 , the pressure of the exhaust gas is effectively uniformized and the flow of the exhaust gas is made smooth. 
         [0051]    In addition, since the first and second flow rectifying members  51 ,  52  have the arcuate cross-sectional shape in the plane perpendicular to the axis of the inner pipe  39 , any increase in the resistance to the flow in the inner pipe  39  is minimized. 
       Embodiment 2 
       [0052]    Embodiment 2 of the present invention will be described below with reference to  FIG. 8 . Those parts of Embodiment 2 which correspond to those of Embodiment 1 are denoted by identical reference symbols, and will not be described in detail below. 
         [0053]    In this example, a flow rectifying means  55  includes a protrusion  55   a  which projects inwardly from the inner surface of the inner pipe  39  in the region where the pressure distribution of the exhaust gas in the upstream end of the inner pipe  39  downstream of the curved portion  36   a  which is located in the downstream portion of the exhaust pipe  36  exhibits a high pressure, i.e., outwardly of the curved direction of the curved portion  36   a  (on the right-hand side in Embodiment 2). The flow rectifying means  55  is disposed in the upstream end of the inner pipe  39  as an inward dent of the upstream end of the inner pipe  39 . 
         [0054]    According to Embodiment 2, since the flow of the exhaust gas is rectified by the protrusion  55   a  of the flow rectifying means  55 , the pressure of the exhaust gas in the inner pipe  39  is uniformized and the flow of the exhaust gas is made smooth, thus increasing the engine output. Even though the annular chamber  43  between the inner pipe  39  and the outer pipe  40  is filled the acoustic absorbent  41 , the acoustic absorbent  41  will not suffer an unbalanced deterioration, and will be replaced at an extended interval. 
       Embodiment 3 
       [0055]    Embodiment 3 of the present invention will be described below with reference to  FIG. 9 . Those parts of Embodiment 3 which correspond to those of Embodiments 1, 2 are denoted by identical reference symbols, and will not be described in detail below. 
         [0056]    The exhaust pipe  36  of the exhaust device  37  has on its upstream portion a curved portion  36   b  extending slightly forwardly from the front side wall of the cylinder head  31  and then curved to the right of the cylinder head  31 . A flow rectifying device or means  56  has a protrusion  56   a  which projects inwardly from the inner surface of the inner pipe  39  in the region where the pressure distribution of the exhaust gas exhibits a high pressure downstream of the curved portion  36   b,  i.e., outwardly of the curved direction of the curved portion  36   b  (on the right-hand side in Embodiment 3). The flow rectifying means  56  is disposed in the exhaust pipe  36  as an inward dent of a portion of the exhaust pipe  36 . 
         [0057]    According to Embodiment 3, even though the curved portion  36   b  is provided in the exhaust pipe  36  so as to develop a pressure distribution such that the pressure of the exhaust gas changes circumferentially in the exhaust pipe  36 , since the flow of the exhaust gas is rectified by the protrusion  56   a  of the flow rectifying means  56  downstream of the curved portion  36   b,  the pressure of the exhaust gas in the exhaust pipe  36  is effectively uniformized and the flow of the exhaust gas is made smooth, thus increasing the engine output. 
         [0058]    While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, but various changes of design may be made therein without departing from the spirit and scope of the claims. 
         [0059]    For example, the inner pipe  39  of the muffler  35  or the exhaust pipe  36  may be deformed into an elliptical cross-sectional shape to provide a flow rectifying means. 
         [0060]      35  . . . Muffler 
         [0061]      36  . . Exhaust pipe 
         [0062]      36   a  . . . Curved portion 
         [0063]      37  . . . Exhaust device 
         [0064]      39  . . . Inner pipe 
         [0065]      40  . . . Outer pipe 
         [0066]      41  . . . Annular chamber 
         [0067]      42  . . . Vent hole 
         [0068]      50 ,  55 ,  56  . . . Flow rectifying means 
         [0069]      51  . . . First flow rectifying member 
         [0070]      51   b,    52   b,    55   a,    56   a  . . . Protrusion 
         [0071]      52  . . . Second flow rectifying member 
         [0072]    E . . . Engine