JP2525067Y2 - Engine exhaust system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust system for an engine, and more particularly to an exhaust system provided with an exhaust silencer having a variable valve for varying the exhaust resistance of an exhaust passage.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the height of a vehicle, an exhaust silencer provided in an exhaust passage disposed below the vehicle is usually provided on a lateral side of a spare tire storage room or the like protruding below the vehicle. Some are arranged in a dead space. Some of the exhaust silencers have a variable valve that changes the exhaust resistance of the exhaust passage. The exhaust silencer increases exhaust resistance at low engine speed to reduce noise, and reduces engine resistance at high engine speed to improve output. I try to plan. In the exhaust silencer having such a variable valve, a driving device for driving the variable valve is provided. As the above-mentioned driving device, a device using an electric motor (Japanese Utility Model Laid-Open No.
No. 614), and those using a negative pressure actuator utilizing negative pressure of intake air.

[0003]

However, since such a driving device involves an operation of generating a driving force for driving a variable valve, the driving device is integrated with the exhaust silencer body. When mounted, there is a problem that the drive device malfunctions due to the thermal effect of high-temperature exhaust gas or damage due to splashing of muddy water or stones during running. In order to prevent this problem, if the driving device is provided far away from the variable valve (exhaust silencer), a transmission unit (for example, a rod or a cable) for transmitting the driving force from the driving device to the variable valve becomes longer. Become
There is a problem that responsiveness and reliability are reduced.

The present invention has been made in view of such a point, and an object of the present invention is to provide an exhaust system of an engine having an exhaust silencer having a variable valve for varying the exhaust resistance of an exhaust passage. An object of the present invention is to improve the reliability of the drive device and reduce the size of the drive device by appropriately disposing the drive device for the variable valve.

[0005]

Means for Solving the Problems In order to achieve the above object, a solution taken in the invention of claim 1 is directed to a vehicle provided with a concave spare tire storage room below a trunk room at a rear portion of the vehicle. An exhaust silencer having a variable valve for varying the exhaust resistance of the exhaust passage is disposed adjacent to the spare tire storage chamber on the outer side of the spare tire storage chamber, and a driving device for the variable valve is provided in the spare tire storage chamber. A configuration is provided.

Specifically, according to the invention of claim 2, claim 1
The driving device according to the invention is constituted by an electric motor and a rotation mechanism for converting the rotational driving force of the electric motor into a variable valve driving force, and the electric motor is disposed on an end panel surface of a rear side wall surface of the vehicle in the spare tire storage room. Along with
The rotation mechanism is disposed between the end panel and the electric motor.

[0007]

According to the above construction, the exhaust silencer is disposed close to the side of the spare tire storage room in the invention according to the first aspect, so that the dead space below the vehicle can be effectively used, and the exhaust silencer can be disposed below the vehicle. Does not protrude. In this case, since the driving device for driving the variable valve of the exhaust silencer is provided in the spare tire storage room, the driving device will be disposed inside the vehicle body located closest to the exhaust silencer, The drive device is not affected by the heat of the exhaust gas, is protected from muddy water and stones during running, and the length of the rod or cable for transmitting the driving force to the variable valve is minimized. Reliability is improved.

Further, in the invention of claim 2, the driving device is constituted by an electric motor and a rotation mechanism, and the electric motor is disposed on an end panel surface of a rear side wall surface of the vehicle in the spare tire storage room, and the rotation device is provided with the electric motor. Since the mechanical section is disposed between the end panel and the electric motor, the rotating mechanism section is protected by the electric motor and the end panel, the periphery of which is generally covered with a protective member around the vehicle in the front-rear direction. In addition, the protection member for protecting the rotating mechanism during the operation of entering and leaving the spare tire is eliminated, and the drive device can be made compact.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a schematic configuration of an engine exhaust system according to an embodiment of the present invention. In these figures,
Reference numeral 1 denotes a spare tire storage room provided with a lower portion of a trunk room at the rear of the vehicle protruding downward and a floor surface formed in a concave shape, and reference numeral 2 denotes a spare tire stored in the spare tire storage room 1. The exhaust silencer 3 is located on the outer side of the spare tire storage room 1 in the vicinity of the spare tire storage room 1.
Are arranged so that the exhaust flow direction is the vehicle front-rear direction. The exhaust silencer 3 is connected to a downstream end of an exhaust passage 4 connected to an engine at an upstream opening provided on a front side surface in the vehicle longitudinal direction. Further, downstream openings of the exhaust silencer 3 are provided on the front side surface and the rear side surface, respectively, and tail pipes 5, 6 for discharging exhaust gas to the atmosphere are connected to the respective downstream openings. ing. The tail pipe 5 connected to the downstream opening on the front side surface of the exhaust silencer 3 is bent into a U-shape immediately from the connection with the opening, so that the exhaust silencer 3
And a side wall of the spare tire storage chamber 1, the rear panel slightly extends rearward from an end panel 7 forming a rear wall surface of the vehicle body, and a downstream end 5 a is open to the rear atmosphere. On the other hand, the tail pipe 6 connected to the downstream opening of the rear side surface of the exhaust silencer 3 is extended almost straight and slightly backward from the end panel 7 to extend.
The downstream end 6a is a downstream end 5a of the tail pipe 5.
Are arranged side by side on the opposite side of the spare tire storage room 1 and open to the rear atmosphere. Further, in the middle of the tail pipe 6, there is provided a variable valve 8 that opens and closes a passage in the pipe, thereby varying a flow resistance of exhaust gas flowing through the exhaust silencer 3 through the exhaust passage 4, that is, an exhaust resistance. It is arranged.

The variable valve 8 is, as shown in FIG.
The valve is biased to a closed state by the spring 9, and is opened by pulling a cable 10 having one end connected to the valve shaft 8 a of the variable valve 8 against the biasing force of the spring 9. The other end of the cable 10 is connected to a drive device 11 disposed below a trunk floor mat 15 which is a partition surface from an upper trunk room in the spare tire storage room 1.

As shown in FIGS. 5 and 6, the driving device 11 includes an electric motor 12 whose entire periphery as a power source is covered by a cover serving as a protection member,
The rotation mechanism 13 converts the rotational driving force of the cable 10 into a pulling force of the cable 10 for driving the variable valve 8 to open and close.
It is composed of In FIG. 5, the end panel 7
A bracket 14 for mounting an electric motor 12 having an L-shaped cross section is fixed to the inner wall surface with bolts so that a space is expanded between the bracket 14 and the end panel 7 on the exhaust silencer 3 side.
The electric motor 12 is fixed to the bracket 14 such that the output shaft 12a is located in a space between the bracket 14 and the end panel 7. Further, in the space between the bracket 14 and the end panel 7, there is disposed a plate-shaped rotation mechanism 13 fixed to the output shaft 12 a of the electric motor 12 and rotating integrally with the output shaft 12 a. As shown in FIG. 6, the rotation mechanism 13 has a fan shape, and a main part thereof is fixed to the output shaft 12a of the electric motor. Is formed with an engagement portion 13a having a hole for engaging the. When the rotation mechanism 13 rotates with the rotation of the electric motor 12, the cable 10 is wound around the rotation mechanism 13, pulls one end of the cable 10, and resists the urging force of the spring 9. 8
Is opened.

Here, the operation of the electric motor 12 is controlled by a control unit (not shown) having a built-in CPU so as to open and close the variable valve 8 according to the operating state of the engine. That is, when the engine speed is equal to or lower than the predetermined value, the electric motor 12 is not operated, the variable valve 8 is closed by the urging force of the spring 9, and the tail pipe 6 does not flow exhaust gas. for that reason,
After passing through the exhaust silencer 3, the exhaust gas flows through only the tail pipe 5 and is exhausted to the atmosphere, so that exhaust noise is reduced due to an increase in exhaust resistance. On the other hand, when the engine speed is equal to or higher than the predetermined value, the electric motor 12 operates to open the variable valve 8, and the exhaust gas is discharged from both the tail pipes 5 and 6, thereby reducing the exhaust resistance. It is designed to improve the output of the engine.

With the above construction, in the above embodiment, the lower part of the trunk room at the rear of the vehicle is protruded downward and the floor surface is formed in a concave shape. Since the exhaust silencer 3 is disposed, a dead space below the vehicle can be made effective on the side of the spare tire storage chamber 1, and the exhaust silencer 3 is prevented from protruding below the vehicle, thereby reducing the vehicle height. Can be planned.

Furthermore, an exhaust silencer 3 for reducing noise at low engine speed and improving output at high engine speed.
Drive device 11 for variable valve 8 that makes exhaust resistance variable
The above-mentioned spare tire storage room 1 which is closest to the exhaust silencer 3 and is located inside the vehicle body where there is little entry / exit of objects.
The drive device 11 is not affected by heat due to the exhaust gas, and can be prevented from being damaged by muddy water or stones jumping while the vehicle is running. Furthermore, since the distance between the driving device 11 and the variable valve 8 can be minimized, the cable 10 for transmitting the driving force does not become long, and deterioration of responsiveness can be prevented. From these, the reliability of the driving device 11 can be improved.

In addition, when the driving device 11 is disposed in the spare tire storage room 1, the electric motor
2 is attached to the end panel 7 so as to have a space between the end mechanism 7 and the end panel 7 via the bracket 14, and the rotation mechanism 13 is provided in the space.
Is protected by being sandwiched between the electric motor 12 and the end panel 7 whose surroundings are covered with a protective member. Therefore, even if a protective member or the like is not separately provided, it is possible to prevent the rotation mechanism unit 13 from being damaged when the spare tire 2 is moved in and out, and the drive device 11 is made compact as a whole. Can be.

[0017]

As described above, according to the exhaust system for an engine according to the first aspect of the present invention, the exhaust silencer is disposed on the outer side of the spare tire storage chamber and close to the spare tire storage chamber. Since the drive device for the variable valve of the silencer is provided in the spare tire storage chamber, the drive device is disposed inside the vehicle body located closest to the exhaust silencer, and is not affected by the heat of the exhaust gas. Can be prevented. In addition, it is possible to protect the vehicle from muddy water and stones during traveling, and it is possible to minimize the length of a rod or a cable for transmitting the driving force to the variable valve, thereby improving the reliability of the driving device. be able to.

Further, in the invention of claim 2, the driving device is constituted by the electric motor and the rotating mechanism, and the rotating mechanism is disposed between the end panel and the electric motor. Is protected by the electric motor and the end panel, the protection member for protecting the rotation mechanism can be eliminated, and the drive device can be made more compact.

[Brief description of the drawings]

FIG. 1 is a plan view showing a schematic configuration of an engine exhaust device according to an embodiment of the present invention.

FIG. 2 is a view in the direction of arrow A in FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an enlarged view of a main part of the variable valve.

FIG. 5 is a plan view of the driving device.

FIG. 6 is a front view of the driving device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spare tire storage room 3 Exhaust silencer 4 Exhaust passage 7 End panel 8 Variable valve 11 Drive device 12 Electric motor 13 Rotation mechanism

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 63-36615 (JP, U) JP-A 2-143377 (JP, U) JP-A 63-57316 (JP, U) JP-A 1 173406 (JP, U) Japanese Utility Model 2-127725 (JP, U) Japanese Utility Model 1-173321 (JP, U) Japanese Utility Model 63-63614 (JP, U) Japanese Utility Model Utility Model 60-116015 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] An exhaust silencer having a variable valve for varying the exhaust resistance of an exhaust passage is provided on the outer side of the spare tire storage chamber in a vehicle provided with a concave spare tire storage chamber below a trunk room at a rear portion of the vehicle. An exhaust system for an engine, wherein the exhaust device is disposed adjacent to a spare tire storage room, and the driving device for the variable valve is provided in the spare tire storage room. 2. A drive device comprising: an electric motor; and a rotation mechanism for converting a rotational driving force of the electric motor into a variable valve driving force. The electric motor is provided on an end panel surface of a rear side wall surface of a vehicle in a spare tire storage room. 2. The exhaust system for an engine according to claim 1, wherein the rotating mechanism is disposed between the end panel and the electric motor.