JP5018164B2 - Motorcycle - Google Patents

Description

  The present invention relates to a motorcycle, and more particularly to an intake air temperature sensor that senses intake air temperature.

  In recent years, an engine equipped with a fuel injection device as a means for supplying an air-fuel mixture to the engine has increased. The fuel injection device senses the throttle opening, engine speed, engine temperature, outside air temperature / atmospheric pressure, intake air temperature, etc. with a sensor and processes the information with a computer to obtain a correction value. The fuel injector directly injects the fuel into the intake passage of the engine, so that the combustion efficiency is good and the output can be improved. In addition, since only the minimum required amount of fuel is injected, the fuel consumption is small.

Among the sensors, the intake air temperature sensor that detects the intake air temperature detects the temperature of the air that is led to the combustion chamber of the engine through the intake passage, and is restricted when placed on each member that constitutes the intake passage. In general, the intake air temperature sensor is disposed on the air cleaner box body (see, for example, Patent Document 1) or in the air cleaner box (see, for example, Patent Document 2).
JP-A-4-94434 JP 2006-188952 A

  However, when the intake air temperature sensor is attached to the air cleaner box body, the intake air flow in the box is not uniform, and the air cleaner box body is box-like, so only a small part of the air temperature can be detected. Not preferable.

  Further, in the case where the intake air temperature sensor is attached to the inside of the air cleaner box, there is a possibility that the temperature of the staying air in the box may be detected, which is not preferable in terms of accuracy.

  Furthermore, in the case of off-road motorcycles, an exhaust device may be disposed near the air cleaner box body.If the intake air temperature sensor is attached to the air cleaner box body, the heat generated by the exhaust device will adversely affect the intake air temperature sensor. There is a risk of effect.

  The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a motorcycle that can detect a homogeneous temperature of the entire intake air led to the combustion chamber of the engine.

In order to solve the above-described problem, a motorcycle according to the present invention includes a combustion chamber of an engine, an air cleaner box, and a straddle-type motorcycle including an electronic fuel injection device. Between the air cleaner box and the combustion chamber, connecting pipes, throttle bodies, and intake pipes are arranged in this order, and the rear cushion unit is positioned so as to overlap with the connecting pipes when viewed from the side of the vehicle. The intake pipe is provided with an intake air temperature sensor for detecting the intake air temperature so as to be substantially along the rear cushion unit .

And in order to solve the subject mentioned above, as described in Claim 2 , the said intake temperature sensor is arrange | positioned in the vehicle width direction inner side from this lowest end part in the vicinity of the lowest end part of a driving | running seat. .

In order to solve the above-described problem, as described in claim 3 , a bulging portion is formed in the connecting pipe, and the intake temperature sensor is disposed on a ceiling wall surface of the bulging portion. is there.

  According to the motorcycle according to the present invention, it is possible to accurately detect the homogeneous temperature of the entire intake air guided to the combustion chamber of the engine. In addition, it is possible to suppress the occurrence of turbulent flow of intake air flow and to suppress moisture adhesion to the sensor detection unit.

  Further, it is possible to prevent the intake air temperature sensor and the rear cushion unit from interfering during the rear suspension stroke. Furthermore, the intake air temperature sensor can be protected and the intake air temperature sensor can be disposed along the height direction, so that workability such as maintenance of the intake air temperature sensor is improved.

  Furthermore, the strength and mounting space of the intake temperature sensor mounting portion can be sufficiently secured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a left side view showing an example of a motorcycle to which the present invention is applied. As shown in FIG. 1, the motorcycle 1 is a saddle type and has a body frame 2, and a head pipe 3 is provided in front of the body frame 2. The head pipe 3 is provided with a steering mechanism including a pair of left and right front forks, a handle bar (not shown), and the like that rotatably supports a front wheel (not shown).

  On the other hand, the body frame 2 is, for example, a twin-tube type, and is expanded in the left-right direction immediately after the head pipe 3, and then a pair of left and right main frames 4 extending diagonally rearward in parallel to each other, and the main frames. A pair of left and right body frames 5 integrally connected to the rear end of the frame 4 and extending substantially upward and downward, and extending substantially downward from the rear lower part of the head pipe 3 and then bent backward. A cradle frame 6 connected to the front side of the lower end of the body frame 5, a pair of left and right seat rails 7 extending obliquely rearward and upward from the rear side of the upper end of the body frame 5, and a seat rail from the rear side of the substantially central part of the body frame 5. 7 is formed at the upper ends of a pair of left and right support frames 8 and body frame 5 that extend obliquely rearward and upward toward the rear end of 7 and connects the left and right body frames 5 together. Consisting of ridge frame 5a and the like.

  A fuel tank 9 is disposed between the left and right main frames 4, and a straddle-type operation seat 10 is disposed over the seat rail 7 from the rear upper surface of the main frame 4. Further, a pivot shaft 11 is installed at a substantially lower center portion of the body frame 5, and a swing arm 12 is swingable about the pivot shaft 11 around the pivot shaft 11 and elastically by a rear cushion unit 13 and a link lever (not shown). A rear wheel (not shown) is pivotally supported at the rear end of the swing arm 12 while being pivotally attached. Furthermore, a part of the side surface of the vehicle body is covered with a vehicle body cover 14 that constitutes a part of an air cleaner box 22 described later.

  FIG. 2 is an enlarged view of the central portion of FIG. 1 and shows a state in which the body cover 14 is removed and a part of the main frame 4 and the body frame 5 is cut away. 3 is a cross-sectional view taken along line III-III in FIG.

  As shown in FIGS. 1 to 3, a four-cycle single-cylinder engine 15 is provided through a plurality of engine suspension brackets (not shown) in a lower middle portion of the vehicle body and in a space surrounded by the main frame 4, the body frame 5, and the cradle frame 6. Is installed. The engine 15 includes a cylinder 16 that is substantially upright in the vertical direction, and an exhaust pipe 18 is connected to a front portion of a cylinder head 17 disposed above the cylinder 16. The exhaust pipe 18 extends rearward around the right side of the engine 15, and the downstream end of the exhaust pipe 18 is disposed obliquely rearwardly on one side of the vehicle body, in this embodiment, on the lower right side of the driver seat 10. Connected to the muffler 19.

  On the other hand, an intake port (not shown) connected to a combustion chamber (not shown) in the engine 15 is provided at the rear portion of the cylinder head 17. The intake port is connected to a downstream end of an intake passage 21 that intersects a plane perpendicular to the cylinder axis 20 and inclines rearwardly, and an upstream end of the intake passage 21 is located below the operation seat 10. It is connected to the arranged air cleaner box 22. Although not shown in detail, the air cleaner box 22 has a structure for taking in air from above.

  The intake passage 21 is arranged in the order of a connecting pipe 23, a throttle body 24, and an intake pipe 25 from an air cleaner box 22 toward a combustion chamber (not shown) in the engine 15, and the intake pipe 25 is connected to an intake port. . The throttle body 24 is provided with a fuel injector (not shown) that constitutes an electronic fuel injection device. Reference numeral 26 denotes a throttle position sensor that also constitutes an electronic fuel injection device.

  The rear cushion unit 13 is disposed at a position overlapping the connecting pipe 23 in a side view. The connecting pipe 23 is curved in the vehicle width direction so as to escape the damper chamber 13 a provided at the upper part of the rear cushion unit 13, and a bulging portion 23 a is provided in the vicinity of the connecting portion with the air cleaner box 22. Further, a portion of the bulging portion 23a that overlaps the rear cushion unit 13 in a side view has a vertically long passage section shape in the vertical direction, and another electronic fuel injection device is configured on the ceiling wall surface of the bulging portion 23a. The intake air temperature sensor 27 is attached with its detection part (not shown) facing the inside of the bulging part 23a.

  The intake air temperature sensor 27 is disposed in the vicinity of the lowermost end portion of the operation seat 10 and substantially along the rear cushion unit 13 on the inner side in the vehicle width direction from the lowermost end portion. The intake air temperature sensor 27 is disposed behind the bridge frame 5 a and is sandwiched between the bridge frame 5 a and the front surface of the air cleaner box 22. Further, the pair of left and right seat rails 7 are located on the side of the intake air temperature sensor 27.

  Next, the operation of this embodiment will be described.

  By arranging the intake air temperature sensor 27 so that the detection part (not shown) of the intake air temperature sensor 27 faces the connecting pipe 23 constituting the intake passage 21 instead of the air cleaner box 22 as in the prior art, the engine 15 A homogeneous temperature detection of the entire intake air guided to the combustion chamber is possible. In the case of a conventional box-shaped air cleaner box, the air inside may stay in some places such as corners, but in the case of the intake passage 21, air constantly flows, so the temperature of the staying air is detected incorrectly. Therefore, the intake air temperature of the intake air introduced into the combustion chamber can be accurately detected.

  In addition, since the detection part of the intake air temperature sensor 27 protrudes into the intake passage 21, if the intake air temperature sensor 27 is disposed in the vicinity of the throttle valve (not shown) provided in the throttle body 24 or downstream thereof, the intake air flow may be disturbed. However, if the intake temperature sensor 27 is attached to the connecting pipe 23 upstream of the throttle body 24, the occurrence of turbulent intake flow can be suppressed. In particular, by providing the intake air temperature sensor 27 on the ceiling wall surface of the connecting pipe 23, it is possible to suppress moisture adhesion to the detection unit even when the intake air contains moisture.

  Further, the rear cushion unit 13 is disposed at a position overlapping the connecting pipe 23 in a side view, and the intake air temperature sensor 27 is disposed substantially along the rear cushion unit 13, so that the intake air temperature sensor 27 is at the time of the rear suspension stroke. And the rear cushion unit 13 can be prevented from interfering with each other.

  Furthermore, the intake air temperature sensor 27 is disposed in the vehicle width direction inner side of the lowermost end portion in the vicinity of the lowermost end portion of the operation seat 10 so that the lowermost end portion of the operation seat 10 covers the side of the intake air temperature sensor 27. The intake air temperature sensor 27 can be protected from flying stones, sand, mud, etc. from the side of the vehicle, and the back side of the driving seat 10 is formed in a concave shape. The dimensions can be secured, and the intake air temperature sensor 27 can be arranged along the height direction. Therefore, if the operation seat 10 is removed, the intake air temperature sensor 27 can be accessed from above, and workability such as maintenance is improved.

  The intake air temperature sensor 27 is disposed between the bridge frame 5a and the front surface of the air cleaner box 22, and the intake air temperature sensor 27 is disposed at a position partially overlapping the seat rail 7 in a side view. All directions of the temperature sensor 27 can be protected by other components.

  Further, by forming the bulging portion 23a in the connecting pipe 23, it is possible to match the intake air characteristics suitable for the model. Further, by forming a bulging portion 23a that bulges in the vehicle width direction over the entire height dimension of the connecting pipe 23 in the vicinity of the connection portion with the air cleaner box 22, the mounting rigidity of the connecting pipe 23 to the air cleaner box 22 is increased. Therefore, the strength of the intake temperature sensor 27 mounting portion can be ensured.

  Moreover, since the detection part of the intake air temperature sensor 27 is arranged in the bulging part 23a, the projecting dimension into the intake passage 21 can be reduced, and the occurrence of turbulent intake air can be suppressed. Furthermore, by providing the relief, the connecting pipe 23 can be set long, and a sufficient space for installing the intake air temperature sensor 27 can be secured. If the air cleaner box 22 has a structure for taking in air from above, the main flow of air flowing in the connecting pipe 23 is formed above the connecting pipe 23, so that the intake air temperature can be detected more accurately.

  Furthermore, the intake passage 21 intersects with a plane perpendicular to the cylinder axis 20 and is inclined rearward upward, thereby enabling straight intake to the intake port, improving intake efficiency and increasing output.

  Furthermore, by projecting the portion of the bulging portion 23a that overlaps the rear cushion unit 13 in a side view with a vertically long passage cross-sectional shape in the vertical direction, it is possible to suppress overhang in the vehicle width direction while maintaining the area of the intake passage 21. Further, since the height dimension of the upstream end of the connecting pipe 23 is substantially the same as the height dimension near the outlet of the air cleaner box 22, the intake air is hardly disturbed. And since it transfers to circular cross-sectional shape smoothly toward the downstream from the air cleaner box 22 exit vicinity, an intake resistance can be reduced. Further, since the vicinity of the upstream end of the connecting pipe 23 is close to the box-shaped and highly rigid air cleaner box 22, the mounting strength of the intake air temperature sensor 27 can be increased.

1 is a left side view of a motorcycle showing an embodiment of a motorcycle according to the present invention. The figure which expanded the center part of FIG. Sectional drawing which follows the III-III line of FIG.

Explanation of symbols

1 motorcycle 10 driving seat 13 rear cushion unit 15 engine 21 intake passage 22 air cleaner box 23 connecting pipe 23a bulging portion 24 of connecting pipe throttle body 25 intake pipe 27 intake air temperature sensor

Claims (3)

In a straddle-type motorcycle equipped with an electronic fuel injection device , the connecting pipe, throttle body, and intake pipe are arranged in this order between the combustion chamber of the engine and the air cleaner box from the air cleaner box to the combustion chamber. The rear cushion unit is disposed at a position overlapping the connecting pipe as viewed from the side of the vehicle, and the intake temperature sensor for detecting the temperature of the intake is substantially aligned with the rear cushion unit. A motorcycle characterized by being arranged as described above . 2. The motorcycle according to claim 1 , wherein the intake air temperature sensor is disposed in the vicinity of the lowermost end portion of the operation seat and on the inner side in the vehicle width direction from the lowermost end portion. The motorcycle according to claim 1 , wherein a bulging portion is formed in the connecting pipe, and the intake air temperature sensor is disposed on a ceiling wall surface of the bulging portion.

Images