JP7134538B1 - Tail pipe for vehicle muffler - Google Patents

Abstract

[PROBLEMS] To provide a tail pipe for a muffler of a vehicle, which has a simple structure and can realize highly efficient rotation of an impeller by effectively utilizing the wind force when the vehicle is running. SOLUTION: A tail pipe 1 for a vehicle muffler according to the present invention includes a body pipe 2 connected to a vehicle muffler and provided with an exhaust port P1 at the rear end thereof, and a wind force at the rear side of the exhaust port P1, which is used when the vehicle is running. and an impeller 3 for promoting the exhaust of fuel gas from the exhaust port P1, wherein an air ejection port 8 is formed on an outer peripheral surface 7a of a rotary shaft 7 that rotatably supports the impeller 3. A guide space 9 communicating with the air ejection port 8 is provided inside the coaxial shaft 7, an air distribution pipe 10 connected to the guide space 9 is provided, and a free end portion 10a of the air distribution pipe 10 is directed forward in the vehicle running direction. It has a configuration in which an air intake port 11 is provided in the . [Selection drawing] Fig. 5

Description

TECHNICAL FIELD The present invention relates to a tail pipe used by being connected to a muffler of a vehicle such as an automobile or a motorcycle.

2. Description of the Related Art Conventionally, in an engine-driven vehicle, it is well known that efficient exhaustion of combustion gas contributes to efficient fuel combustion.

Therefore, the inventor of the present application has already developed a tail pipe for a vehicle muffler that can assist the exhaust of combustion gas with an impeller and achieve highly efficient exhaust, as shown in Patent Document 1 below.

Design registration No. 1665158

According to the vehicle muffler tail pipe of Patent Document 1, combustion gas can be efficiently exhausted by rotation of the impeller, and fuel efficiency can be improved. Since the impeller can be rotated by , there is no need to provide a drive source for the impeller, which saves energy.

How efficiently the impeller can be rotated is important in order to make the exhaust promotion based on the rotation of the impeller more effective. SUMMARY OF THE INVENTION The present invention provides a tail pipe for a vehicle muffler, which has a simple structure and is capable of realizing highly efficient rotation of an impeller by effectively utilizing wind power during vehicle travel.

Briefly, the tail pipe for a vehicle muffler according to the present invention includes a main pipe connected to a vehicle muffler and provided with an exhaust port at the rear end thereof, and a main pipe, which rotates by the wind force when the vehicle is running, on the rear side of the exhaust port. A vehicular tail pipe provided with an impeller that facilitates exhaustion of fuel gas from an exhaust port, wherein an air ejection port is provided on the outer peripheral surface of a rotating shaft that rotatably supports the impeller, and a guide space communicates with the air ejection port. is coaxially provided inside the guide space, an air distribution pipe is provided to connect with the guide space, and an air intake is provided at the free end of the air distribution pipe so as to face forward in the vehicle running direction. The air taken in is ejected from the air ejection port through the air delivery pipe and the guide space to form a compressed air layer between the inner peripheral surface of the bearing hole of the impeller and the outer peripheral surface of the rotating shaft. The impeller can be rotated with high efficiency.

Preferably, a plurality of the air ejection ports are provided at equal intervals along the circumferential direction of the rotating shaft, and more preferably, a plurality of air ejection ports are provided along the axial direction of the rotating shaft so that the rotating shaft and the bearing hole are provided. A uniform compressed air layer is formed between them, and highly efficient rotation of the impeller can be realized.

A cladding tube having a diameter larger than that of the main tube is provided, and the cladding tube is fixed by a rib wall connecting the inner peripheral surface of the cladding tube and the outer peripheral surface of the main tube, and rotates the impeller along its rotational direction. By covering the outer circumference of the exhaust port of the main pipe and providing the intake port at the front end, the wind force can be appropriately transmitted to the impeller when the vehicle is running.

Since the free end of the air delivery pipe is funnel-shaped, the air intake port can be opened wide to take in as much air as possible.

According to the tail pipe for a vehicle muffler according to the present invention, although it has a simple structure, it is possible to effectively utilize the wind force when the vehicle is running and to realize highly efficient rotation of the impeller. Therefore, it can greatly contribute to the improvement of the fuel efficiency of the vehicle.

Moreover, there is no need to provide a drive source for the impeller, and no drive cost is required.

It is a rear view of the tail pipe for vehicle mufflers. 1 is a front view of a tail pipe for a vehicle muffler; FIG. It is the perspective view which looked at the tail pipe for vehicle mufflers from the back side. FIG. 3 is a perspective view of a rotating shaft in the vehicle muffler tail pipe; FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; FIG. 4 is a cross-sectional view showing another example of a tail pipe for a vehicle muffler; It is an enlarged sectional view of a rotating shaft and a bearing hole. FIG. 4 is an enlarged cross-sectional view showing an example in which an air thrust chamber is provided; It is explanatory drawing which shows a use condition.

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a vehicle muffler tail pipe according to the present invention will be described below with reference to FIGS. 1 to 9. FIG.

<Basic configuration>
The vehicle muffler tail pipe 1 according to the present invention, as shown in FIG. can contribute to As the vehicle V, as shown in the figure, any vehicle having an engine (internal combustion engine) such as a motorcycle and a muffler for exhausting combustion gas can be used as the vehicle muffler according to the present invention. can be applied.

As shown in FIGS. 1 to 3, 5, and 6, a main pipe 2 having a front end 2a connected to a vehicle muffler and having an opening at a rear end 2b as an exhaust port P1, and a rear side of the exhaust port P1. In addition, it has a basic configuration including an impeller 3 that rotates with wind force during vehicle travel and promotes the exhaust of fuel gas from the exhaust port P1.

Therefore, the vehicle muffler is extended by the main pipe 2 and the exhaust port P1 is shifted rearward, and the impeller 3 is arranged with an appropriate gap L between the exhaust port P1 and the impeller 3. The combustion gas discharged from the exhaust port P1 can efficiently flow rearward. The distance L between the exhaust port P1 and the impeller 3 can be appropriately adjusted based on the outer diameter φ1 of the impeller, the inner diameter (diameter of the exhaust port P1) φ2 of the rear end portion 2b of the main pipe 2, and the like.

Further, the main pipe 2 has a front end portion 2a side having substantially the same diameter as the vehicle muffler to be connected, and a rear end portion 2b side having a diameter as large as possible to form an exhaust port P1. This is for efficient exhaust. According to the present invention, in order to make the rear end portion 2b side of the main tube 2 larger in diameter than the front end portion 2a side, as shown in FIG. Alternatively, as shown in FIG. 6, pipes having two different diameters may be connected by a tapered pipe portion 2e.

When the main tube 2 is provided with a stepped portion 2d as shown in FIG. 5, a small air intake window 2f can be provided in the stepped portion 2d as shown in FIGS. This is for accelerating the rotation of the impeller 3 and accelerating the discharge of the combustion gas. Preferably, as shown in FIG. 2, the small air intake window 2f has an arcuate elongated hole shape, and a knob portion that can be moved in the elongated small air intake window 2f and fixed at a desired position. 2g is provided so that the direction of air taken in can be adjusted by the knob 2g. In addition, the knob portion 2g can be composed of known bolts and nuts.

1, 2, 5, and 6, 2h is a pair of fixing pieces for preventing expansion of the diameter of the main tube 2 connected to the muffler and fixing it. , the fixed pieces 2h can be brought closer to each other or separated from each other. However, in the present invention, the method of connecting with the vehicle muffler is not limited to the method using the fixing piece.

The main tube 2 is preferably made of metal, and is preferably made of a material that allows the hot combustion gas to flow appropriately. More preferably, it is made of stainless steel, which is a weather-resistant metal.

<<Structure of cladding tube 4>>
In the present invention, preferably, as shown in FIGS. 1 to 3 and 5, a cladding tube 4 having a larger diameter than the main tube 2 is provided. It is fixed by a rib wall 5 connecting the outer peripheral surface 2c of the rear end portion 2b of the main pipe 2, and covers the impeller 3 along its rotational direction on the rear end portion 4b side, covering the outer periphery of the exhaust port P1 of the main pipe 2. At the same time, the opening of the front end portion 4a is provided as an intake port P2.

That is, the cladding pipe 4 not only covers and protects the exhaust port P1 of the impeller 3 and the main pipe 2, but also provides an air intake port P2 to effectively take in the wind generated when the vehicle is running. The air can be supplied to each blade 3a of the impeller 3 in an effective direction while rectifying the flow of air. Therefore, the wind force generated when the vehicle is running can be appropriately transmitted to the blades 3a of the impeller 3, and the impeller 3 can be efficiently rotated.

The inner diameter φ3 of the cladding tube 4 is naturally set to be larger than the outer diameter φ1 of the impeller 3, but can be appropriately adjusted based on the desired area of the intake port P2.

≪Impeller configuration≫
As described above, the impeller 3 is arranged on the rear side of the exhaust port P1 of the main pipe 2, is covered with the cladding pipe 4, and is rotated by the wind force taken in from the intake port P2 to exhaust the combustion gas from the exhaust port P1. promote Therefore, the shape and inclination of the blade 3a are adjusted so that the combustion gas is pulled leftward in the left-right direction in FIGS. The blades 3a of the impeller 3 are preferably made of metal, and are preferably made of a material that allows the hot combustion gas to flow appropriately. More preferably, it is made of stainless steel, which is a weather-resistant metal. Moreover, the bearing portion 3b having the bearing hole 6 is preferably made of carbon or ceramics in order to reduce weight and increase heat resistance.

As shown in FIGS. 5 and 6, the impeller 3 is rotatably supported by a bearing hole 6 provided in the bearing portion 3b and a rotating shaft 7 fixed to the main tube 2. As shown in FIG.

The rotary shaft 7 is supported by a rotary shaft support portion 13 provided at the rear end portion 2b of the main tube 2, as also shown in FIG. The rotating shaft support portion 13 preferably has a cross shape as shown in the drawing, and firmly supports the rotating shaft 7 . In addition, the rotating shaft supporting portion 13 supports a receptacle-shaped impeller supporting portion 14 in the same manner as the rotating shaft 7, and the impeller supporting portion 14 rotatably rotates the bearing portion 3b of the impeller 3 together with a retaining member 15 described later. Fix it so that it does not rattle in the axial direction.

In the present invention, as shown in FIGS. 4 to 7, an air ejection port 8 is provided on the outer peripheral surface 7a of the rotating shaft 7, and a guide space 9 communicating with the air ejection port 8 is formed inside the rotating shaft 7. It has a configuration to provide. As will be described later, the air ejection port 8 ejects air between the inner peripheral surface 6a of the bearing hole 6 and the outer peripheral surface 7a of the rotating shaft 7 to form a compressed air layer, thereby constructing an air bearing mechanism.

It is desirable that a plurality of air ejection ports 8 be provided at regular intervals along the circumferential direction of the outer peripheral surface 7a of the rotating shaft 7 . This is for forming a uniform compressed air layer. Furthermore, by providing a plurality of compressed air layers along the axial direction of the outer peripheral surface 7a of the rotating shaft 7, the compressed air layer can be evenly spread over the entire area between the inner peripheral surface 6a of the bearing hole 6 and the outer peripheral surface 7a of the rotating shaft 7 more reliably. can be formed. For example, as shown in FIGS. 4 to 6, four air ejection openings 8 are provided along the circumferential direction of the outer peripheral surface 7a of the rotating shaft 7, and the set of four air ejection openings 8 is arranged in the axial direction. Three sets can be provided along the

Further, an air delivery pipe 10 connected to the guide space 9 inside the rotating shaft 7 is provided, and an air intake port 11 is provided at the free end 10a of the air delivery pipe 10 forward in the vehicle running direction. Preferably, the free end 10a of the air delivery tube 10 is funnel-shaped so that the air inlet 11 is wide open to take in as much air as possible.

A plurality of air distribution pipes 10 can be provided as shown. When a plurality of air delivery pipes are provided, the intervals between adjacent air delivery pipes are kept constant so that air can be taken in smoothly. Then, a large amount of air can be sent smoothly by sending it into the guide space 9. - 特許庁

In the tail pipe 1 for a vehicle muffler according to the present invention having the configuration described above, the air taken in from the air intake port 11 is ejected from the air ejection port 8 through the air delivery pipe 10 and the guide space 9, A compressed air layer is formed between the inner peripheral surface 6a of the bearing hole 6 of the impeller 3 and the outer peripheral surface 7a of the rotating shaft 7, so that the impeller 3 can be rotated with high efficiency.

A threaded shaft portion 7b is provided at the distal end portion of the rotating shaft 7, and the impeller 3 is retained by screwing a retaining member 15 onto the threaded shaft portion 7b. A known nut member can be used as the retaining member 15, but preferably, as shown in FIG. 6, a double nut is used to ensure more secure retaining. Alternatively, as shown in FIG. 8, which will be described later, a hard lock nut can be used to ensure reliable retention.

In the present invention, as shown in FIG. 8, an impeller support portion 16 is also provided on the rear end side of the impeller 3, and a seal member 17 seals between the impeller support portion 16 and the bearing portion 3b. A second air thrust chamber 18 may be defined. By providing the rotary shaft 7 with the air ejection port 8 communicating with the air thrust chamber 18, the air is filled in the air thrust chamber 18, and the impeller 3 is properly pushed back by the wind pressure when the vehicle is running. As a result, the axial rattling of the impeller 3 can be suppressed. As the sealing member 17, a known oil seal can be used in addition to the O-ring as shown in the drawing.

As shown in FIG. 8, when the vehicle muffler tail pipe 1 according to the present invention described above is connected to the muffler M of the vehicle V and the vehicle runs, the impeller 3 can be efficiently operated without applying special power. The rotation of the impeller 3 facilitates the exhaust of combustion gas from the exhaust port P1, thereby improving the fuel efficiency of the vehicle engine and preventing the reduction in output due to carbon deposits and the like.

1... Tail pipe for vehicle muffler,
2 Main tube 2a Front end 2b Rear end 2c Outer peripheral surface 2d Stepped portion 2e Taper tube 2f Small air intake window 2g Knob 2h Fixed piece 3 ... impeller, 3a ... blade, 3b ... bearing,
4 ... cladding tube, 4a ... front end, 4b ... rear end, 4c ... inner peripheral surface,
5... rib wall,
6... bearing hole, 6a... inner peripheral surface,
7... Rotating shaft, 7a... Peripheral surface, 7b... Screw shaft part,
8... Air ejection port,
9... guide space,
10... Air delivery pipe, 10a... Free end,
11... Air intake,
12... Stacking section, 12a... Stacking space,
13 ... rotating shaft support part,
14 ... impeller support,
15... retaining member,
16... impeller support,
17... Seal member, 18... Air thrust chamber,
P1... exhaust port, P2... intake port,
L: Distance between the exhaust port and the impeller,
φ1: outer diameter of impeller, φ2: inner diameter of main tube, φ3: inner diameter of cladding tube,
V...vehicle, M...muffler,
B... bolt, N... nut.

Claims (5)

A vehicle equipped with a body pipe connected to a vehicle muffler and provided with an exhaust port at the rear end thereof, and an impeller behind the exhaust port that rotates with the force of the wind force during running of the vehicle and promotes the exhaust of fuel gas from the exhaust port. A tail pipe for a motor vehicle, wherein an air ejection port is provided on the outer peripheral surface of a rotating shaft that rotatably supports the impeller, a guide space communicating with the air ejection port is provided inside the coaxial shaft, and air delivery is connected to the guide space. An air intake port is provided at the free end of the air distribution pipe so as to face forward in the direction of travel of the vehicle. and forming a compressed air layer between the inner peripheral surface of the bearing hole of the impeller and the outer peripheral surface of the rotating shaft to rotate the impeller with high efficiency. 2. The tail pipe for a vehicle muffler according to claim 1, wherein a plurality of said air ejection ports are provided at equal intervals along the circumferential direction of said rotating shaft. 3. The tail pipe for a vehicle muffler according to claim 1, wherein a plurality of said air ejection ports are provided along the axial direction of said rotating shaft. providing a cladding tube having a diameter larger than that of the main tube, the cladding tube being fixed by a rib wall connecting the inner peripheral surface of the cladding tube and the outer peripheral surface of the main tube, and covering the impeller along its rotational direction; 2. The tail pipe for a vehicle muffler according to claim 1, wherein the body pipe covers the outer periphery of the exhaust port and is provided with an intake port at the front end thereof. 2. The tail tube for a vehicle muffler according to claim 1, wherein the free end of said air delivery tube is funnel-shaped.

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