JP2020070794A - Saddle-riding type vehicle - Google Patents

Abstract

To simplify an attachment structure of an exhaust gas sensor and its guard to an exhaust pipe in a saddle-riding type vehicle.SOLUTION: A saddle-riding type vehicle 1 includes: exhaust pipes 35L, 35R connected to an exhaust port 22 of an engine 20; exhaust gas sensors 33L, 33R for detecting components in exhaust gas; and guard bodies 34L, 34R of the exhaust gas sensors 33L, 33R. Male screw parts 33b provided at the exhaust gas sensors 33L, 33R are threadedly engaged with pedestal parts 37d provided at the exhaust pipes 35L, 35R to fix the exhaust gas sensors 33L, 33R to the exhaust pipes 35L, 35R. The guard bodies 34L, 34R are sandwiched between the exhaust gas sensors 33L, 33R and the pedestal part 37d to be fixed to the exhaust pipes 35L, 35R.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a saddle type vehicle.

  A motorcycle, which is an example of a saddle-ride type vehicle disclosed in Patent Document 1, includes an exhaust gas sensor attached to an exhaust pipe for detecting an oxygen concentration in exhaust gas, and an exhaust gas sensor guard body. The guard body is fixed to the exhaust pipe by welding.

  The conventional straddle-type vehicle including the one disclosed in Patent Document 1 has room for improvement regarding simplification of the mounting structure of the exhaust gas sensor and its guard to the exhaust pipe.

JP, 2005-68292, A

  An object of the present invention is to simplify the structure for mounting an exhaust gas sensor and its guard body to an exhaust pipe in a saddle type vehicle.

  The present invention includes an exhaust pipe connected to an exhaust port of an engine, an exhaust gas sensor for detecting a component in exhaust gas, and a guard body of the exhaust gas sensor, which is engaged with the exhaust gas sensor. The exhaust gas sensor is fixed to the exhaust pipe by screwing a portion to an engaging portion provided in the exhaust pipe, and the guard body is sandwiched between the exhaust gas sensor and the engaging portion. Accordingly, a saddle-ride type vehicle fixed to the exhaust pipe is provided.

  According to the present invention, the guard body of the exhaust gas sensor is fixed to the exhaust pipe by being sandwiched between the exhaust gas sensor and the engaging portion provided in the exhaust pipe. As a result, it is not necessary to provide a structure such as a bracket on the exhaust pipe, the frame, etc. just for fixing the guard body, and the structure can be simplified.

  In the present invention, in addition to the above configuration, the following configuration can be provided.

  (A) The exhaust gas sensor and the guard body are fixed to an inner portion of the exhaust pipe in the vehicle body width direction, project from the exhaust pipe inward in the vehicle body width direction, and are seen from the outside in the vehicle body width direction. Hidden in the exhaust pipe.

  (B) The exhaust gas sensor is inclined with respect to the vehicle width direction so that the front end side is located rearward of the base end side in a plan view.

  (C) The exhaust pipe includes a first portion whose one end is connected to the exhaust port, and a second portion whose one end is connected to the other end of the first portion and which extends in the vertical direction. The guard body is fixed to the second portion.

  (D) The second portion of the exhaust pipe is arranged adjacent to one of the pair of down frames, and the harness extending from the exhaust gas sensor is arranged along the one of the down frames.

  (E) A harness extends from an end portion of the exhaust gas sensor opposite to the engaged portion, and the guard body includes a supported portion that is sandwiched between the exhaust gas sensor and the engaging portion, and the covered portion. A protective portion having a base end connected to a support portion and covering the exhaust gas sensor and extending along the exhaust gas sensor; and a width of the protective portion decreases from the base end toward the tip. There is.

  (F) The tip of the protective portion of the guard body is curved in a direction away from the exhaust gas sensor.

  (G) The guard body includes a detent portion for stopping rotation of the engaged portion of the guard body with respect to the exhaust gas sensor about the central axis.

  (H) The exhaust pipe includes a plurality of exhaust pipes arranged side by side in the vehicle width direction, and the gas sensor and the guard body are fixed to the exhaust pipes, respectively.

  According to the configuration (a), by setting the positions and postures of the exhaust gas sensor and the guard body in this manner, it is possible to prevent the exhaust gas sensor and the guard body from contacting an obstacle by the exhaust pipe.

  According to the configuration (b), since the posture of the exhaust gas sensor is tilted backward with respect to the vehicle width direction, the front projected area of the exhaust gas sensor and the guide body is reduced. As a result, it is possible to reduce the probability that foreign matter such as rolled-up mud or sand collides with the exhaust gas sensor. That is, the exhaust gas sensor can be protected by setting the posture.

  According to the configuration (c), by fixing the exhaust gas sensor to the second portion of the exhaust pipe extending in the vertical direction, even if liquid pool occurs in the exhaust pipe, it is possible to suppress the infiltration of water into the exhaust gas sensor.

  According to the configuration (d), since the harness is arranged along the down frame, it is difficult for the user to see the harness extending from the exhaust gas sensor when the user looks at the saddle type vehicle. As a result, the appearance of the saddle riding type vehicle is improved.

  According to the above configuration (e), the width of the front end of the protective portion of the guard body is narrower than that of the base end. Therefore, the tip of the protective portion of the guard body is unlikely to be caught by the portion of the harness connected to the exhaust gas sensor, and the harness is protected.

  According to the configuration (f), since the tip of the protective portion is curved away from the exhaust gas sensor, that is, outward, the portion of the harness connected to the exhaust gas sensor is deformed due to running wind or vehicle body posture. Even in such a case, it is possible to prevent interference with the tip of the protection portion.

  According to the above configuration (g), since the rotation of the guard body is stopped by the rotation preventing portion, the guard body can be maintained in a posture capable of appropriately protecting the exhaust gas sensor.

  Another aspect of the present invention includes an exhaust pipe connected to an exhaust port of an engine, and an exhaust gas sensor for detecting a component in exhaust gas, wherein the exhaust gas sensor is provided in a vehicle body width direction of the exhaust pipe. A straddle-type vehicle fixed to an inner portion, protruding from the exhaust pipe inward in the vehicle body width direction, and hidden in the exhaust pipe when viewed from the outside in the vehicle body width direction.

  According to this aspect, by setting the positions and the postures of the exhaust gas sensor and the guard body in this way, it is possible to prevent the exhaust gas sensor and the guard body from contacting the obstacle by the exhaust pipe.

  According to the straddle-type vehicle of the present invention, the attachment structure of the exhaust gas sensor and its guard body to the exhaust pipe can be simplified.

Left side view of the motorcycle. The perspective view which looked at an exhaust device and a frame from the left front. The perspective view which looked at an exhaust device and a frame from the right back. The top view of an exhaust device and a frame. The front view of an exhaust device and a frame. Sectional drawing of the attachment structure to an exhaust pipe of an exhaust gas sensor. FIG. 3 is a perspective view of a structure for mounting an exhaust gas sensor on an exhaust pipe. FIG. 3 is an exploded perspective view of a structure for mounting an exhaust gas sensor on an exhaust pipe.

  A motorcycle will be described below as a saddle-ride type vehicle according to an embodiment of the present invention with reference to the accompanying drawings. For convenience of description, the traveling direction of the motorcycle is defined as “front” of the motorcycle and each component, and the left and right in the vehicle width direction when the occupant riding the motorcycle is looking forward is defined as the motorcycle and each component. This will be described as “right and left”.

  FIG. 1 shows a motorcycle 1 according to an embodiment of the present invention. The motorcycle 1 is a naked type without a cowl. The naked type is one in which the periphery of the engine is exposed to the outside of the vehicle body. Specifically, the side surface of the engine in the vehicle width direction is exposed outward in the vehicle width direction, and the exhaust pipe is also exposed outward in the vehicle width direction. That is, the side surface of the engine and the exhaust pipe are configured to be visible in a side view.

  Referring to FIGS. 2 to 5 together, a body frame 10 of the motorcycle 1 includes a head pipe 11, a main frame 12 extending rearward from the head pipe 11, and a pair of left and right extending from the head pipe 11 and extending downward rearward. The down frame 13 of FIG. The down frame 13 includes a vertical pipe portion 14 having an upper end connected to the head pipe 11 and extending vertically, and a lower pipe portion 15 extending rearward from a lower end of the vertical pipe portion 14.

  Referring to FIG. 1, the motorcycle 1 includes an engine 20 having two left and right cylinders 21 between a front wheel 2 and a rear wheel 3. In the motorcycle 1, the air around the engine 20 is replaced by the traveling wind to prevent the ambient temperature of the engine 3 from rising. The engine 20 is an air-cooled engine in which fins for heat dissipation are formed on a cylinder head and a cylinder block. The engine 20 is supported by the body frame 10. Specifically, the engine 20 is arranged below the main frame 12 and is supported by the main frame 12 and the down frame 13. 2 to 5, the illustration of the engine 20 is omitted.

  Referring to FIGS. 2 to 5, the exhaust device 30 of the motorcycle 1 includes an exhaust pipe system 31, an exhaust muffler 32, an exhaust gas sensor 33, and a guard body 34 of the exhaust gas sensor 33. In the present embodiment, the exhaust gas sensor 33 is an oxygen sensor and detects the oxygen concentration contained in the exhaust gas. Specifically, in the exhaust gas sensor of the present embodiment, when the fuel contained in the intake air is larger than the ideal air-fuel ratio (rich) before combustion, and when the fuel contained in the intake air is smaller than the ideal air-fuel ratio before combustion. In the (lean) state, the threshold value is set so that the output changes in two steps.

  The exhaust pipe system 31 has two left and right exhaust pipes 35 respectively corresponding to the two cylinders 21. The exhaust pipe 35 is arranged so as to spread outside the down frame 13 in the vehicle width direction. The exhaust pipe 35 includes an upper pipe portion (first portion) 36 having one end connected to the exhaust port 22 of the cylinder 21 and extending forward while facing the vehicle width direction outer side. Further, the exhaust pipe 35 includes a vertical pipe portion (second portion) 37, which has an upper end connected to the other end of the upper pipe portion 36 and extends in the vertical direction. The vertical pipe portion 37 is located adjacent to the vertical pipe portion 14 of the down frame 13 on the outer side in the vehicle body width direction. The exhaust pipe 35 includes a lower pipe portion 38, one end of which is connected to the lower end of the vertical pipe portion 37 and which extends rearward while facing slightly inward in the vehicle width direction. The exhaust muffler 32 is connected to the other end of the lower pipe portion 38. The two exhaust pipes 35 are connected to each other by a communication pipe 39 in the lower pipe portion 38.

  The exhaust gas sensor 33 and its guard body 34 are fixed to the two exhaust pipes 35, respectively. Hereinafter, the mounting structure of the exhaust gas sensor 33L and the guard body 34 to the one exhaust pipe 35 will be described. The mounting structure of the exhaust gas sensor 33 and the guard body 34 for the other exhaust pipe 35 is the same as the mounting structure on one side, except that it is bilaterally symmetrical, and a description thereof will be omitted.

  2 to 5, the exhaust gas sensor 33 and the guard body 34 are fixed to the vertical pipe portion 37 of the exhaust pipe 35. The exhaust gas sensor 33 and the guard body 34 are arranged outside the down frame 13 in the vehicle width direction. The positions where the exhaust gas sensor 33 and the guard body 34 are fixed and the details of their postures will be described later.

  Referring to FIGS. 6 to 8, the vertical pipe portion 37 of the exhaust pipe 35 has a substantially circular tubular shape, but is provided with a flat portion 37b obtained by partially flattening the pipe wall 37a. Referring to FIG. 6, the tubular wall 37a of the vertical pipe portion 37 has a cross-sectional shape of a circular arc portion of 270 degrees or more, and both circumferential ends of the circular arc portion are connected by a flat portion 37b. The flat portion 37b is provided with a through hole 37c penetrating the tube wall 37a. A disk-shaped pedestal portion 37d is provided outside the flat portion 37b. In this embodiment, the pedestal portion 37d is welded to the flat portion 37b. The pedestal portion 37d is provided with a female screw 37e communicating with the through hole 37c so as to penetrate in the thickness direction. The direction of the central axis CL of the female screw 37e is coaxial with the axis of the through hole 37c. Further, in the pedestal portion 37d, a rotation angle position of the guard body 34 around the central axis CL of a male screw 33d and a female screw 37e described later is maintained in cooperation with a rotation stop portion 34h of the guard body 34 also described below. A structure is provided. In the present embodiment, as the structure, the pedestal portion 37d is provided with the notch portion 37h obtained by removing the top surface 37f and the peripheral surface 37g. By providing the cutout portion 37h, the outer peripheral shape of the pedestal portion 37d is non-circular with respect to the central axis CL of the female screw 37e.

  The exhaust gas sensor 33 has a substantially straight tubular shape as a whole, has a male screw portion 33b at one end of the housing 33a, and has an exterior portion 33c at the end opposite to the male screw portion 33b of the housing 33a. There is. The harness 41 extends from the exterior portion 33c. The male screw portion 33b includes a male screw 33d and a nut-shaped portion 33e for screwing. A sensing portion 33f is provided at the tip of the male screw 33d. The sensing unit 33f houses, for example, an element (not shown) for detecting the oxygen concentration in the exhaust gas, and this element is connected to the harness 41.

  The guard body 34 in the present embodiment is made of a metal plate and is formed in a substantially L shape. The guard body 34 has a flat plate-shaped supported portion 34a. A through hole 34b in the thickness direction is formed in the supported portion 34a. Further, the guard body 34 includes a protection portion 34c which is bent substantially at a right angle to the supported portion 34a and is continuous. The protective portion 34c has a base end 34d connected to the supported portion 34a, and extends upward from the supported portion 34a in FIGS. 6 to 8, specifically, along the axial direction of the through hole 34b. It extends in a direction away from the vertical pipe portion 37. The protection part 34c protects the exhaust gas sensor 33 from flying objects and the like. The guard body 34 is a detent that protrudes downward from the supported portion 34a in FIGS. 6 to 8, specifically, in the direction approaching the vertical pipe portion 37 of the exhaust pipe 35 along the axial direction of the through hole 34b. The portion 34h is provided. The rotation stopping portion 34h is provided on the opposite side of the through hole 34b from the protection portion 34c.

  Referring to FIG. 6, the exhaust gas sensor 33 is fixed to the exhaust pipe 35 by screwing the male screw 33d into the female screw 37e. The sensing portion 33f of the exhaust gas sensor 33 projects into the exhaust pipe 35 from the pipe wall 37a through the through hole 37c.

  Since the supported portion 34a is sandwiched between the male screw portion 33b of the exhaust gas sensor 33, more specifically, the nut-shaped portion 33e and the top surface 37f of the pedestal portion 37d, the guard body 34 is attached to the exhaust pipe 35. It is clamped and fixed. An elastic member, specifically, an annular packing 42 is interposed between the top surface 37d of the pedestal portion 37d and the supported portion 34a of the guard body 34. The cutout portion 37h of the female screw portion 37 is located radially outside the nut-shaped portion of the exhaust gas sensor 33.

  The guard body 34 of the exhaust gas sensor 33 is mechanically fixed to the exhaust pipe 35 by being sandwiched between the exhaust gas sensor 33 and a pedestal portion 37d provided on the exhaust pipe 35, not by welding. Therefore, the weld bead, which is inevitable when the guard body is fixed by welding, can be eliminated. The absence of weld beads improves the appearance of saddle riding type vehicles. Further, it is not necessary to provide a structure such as a bracket on the exhaust pipe, the frame or the like only for fixing the guard body, and the structure can be simplified.

  The protective portion 34 c of the guard body 34 covers the side of the exhaust gas sensor 33 and extends along the exhaust gas sensor 33. The protection portion 34c is curved so that the outer surface 34f is convex. A gap is provided between the inner surface 34g of the protection portion 34c and the exhaust gas sensor 33.

  The width of the protection portion 34c of the guard body 34 decreases from the base end 34d connected to the supported portion 34a toward the tip 34e that is the opposite side thereof, and the tip 34e of the protection portion 34c is the same as the base end 34d. The width is narrower in comparison. Therefore, the tip of the protection portion 34c is unlikely to be caught by the portion of the harness 41 that protrudes from the exterior portion 33c of the exhaust gas sensor 33, and the harness 41 is protected.

  A tip 34e of the protective portion 34c of the guard body 34 is curved in a direction away from the exhaust gas sensor 33, that is, outward. It is possible to prevent the portion of the harness 41 connected to the exhaust gas sensor 33 from interfering with the tip end 34e of the protective portion 34c of the guard body 34 even when the portion is deformed due to running wind or the posture of the vehicle body. Further, since the tip end 34e of the protection portion 34c is extended to a position covering the portion of the harness 41 connected to the exhaust gas sensor 33, the portion of the harness 41 connected to the exhaust gas sensor 33, which is easily damaged by scattered objects, is effective. Can be protected.

  The detent portion 34h of the guard body 34 is engaged with the cutout portion 37h of the pedestal portion 37d. Therefore, the guard body 34 does not rotate around the central axis CL of the male screw 33d and the female screw 37e, and the rotation angle position of the guard body 34 with respect to the central axis CL is determined by the protection portion 34 of the guard body 34 from the exhaust gas sensor 33 in the traveling direction of the vehicle. Maintained to stay forward.

  The protective portion 34c of the guard body 34 is located in front of the exhaust gas sensor 33 in the traveling direction of the vehicle. That is, the protective portion 34c covers the front region of the exhaust gas sensor 33, and is partially cut out in the circumferential direction around the axis of the through hole 34b so that the rear region of the exhaust gas sensor 33 is exposed. Therefore, the replacement of the air around the exhaust gas sensor 33 by the traveling wind can be promoted, and the temperature rise of the exhaust gas sensor 33 can be suppressed.

  The protection portion 34c is partially cut out in the circumferential direction around the axis of the through hole 34b so that the lower region of the exhaust gas sensor 33 is exposed. Therefore, it is possible to prevent flying objects such as rainwater and muddy water from accumulating in the protective portion 34c, and it is possible to suppress deterioration of the exhaust gas sensor 33 due to sticking and liquid adhesion.

  By providing the rotation stopping portion 34h, even if a flying object collides with the protection portion 34, the protection portion 34c can prevent the angular displacement of the through hole 34b around the axis line, and the guard body 34 prevents the exhaust gas sensor 33 from rotating. The protective effect of can be maintained.

  2 to 5, the exhaust gas sensor 33 and the guard body 34 are fixed to an inner portion of the vertical pipe portion 37 in the vehicle width direction. Further, the exhaust gas sensor 33 and the guard body 34 protrude inward in the vehicle width direction from the vertical pipe portion 37 of the exhaust pipe 35. By setting the positions and postures of the exhaust gas sensor 33 and the guard body 34 in this way, the exhaust gas sensor 33 and the guard body 34 are hidden by the vertical pipe portion 37 of the exhaust pipe 35 when viewed from the outside in the vehicle width direction ( (See FIG. 1). Therefore, the exhaust pipe 35 can prevent the exhaust gas sensor 33 and the guard body 34 from contacting an obstacle. Further, since the exhaust gas sensor 33 is not visible, the vertical pipe portion 37 of the exhaust pipe 35 has a clean appearance, and the appearance of the motorcycle 1 is improved. In the naked type vehicle in which the exhaust pipe 35 is exposed in the side view as in the present embodiment, the exhaust pipe 35 can be made conspicuous in the vehicle side view so that the exhaust pipe 35 can be made conspicuous, and the appearance is improved. Can be increased. In the present embodiment, the exhaust gas sensor 33 and the guard body 34 are entirely hidden by the vertical pipe portion 37 of the exhaust pipe 35 when viewed from the outside in the vehicle width direction, but some of these are hidden by the vertical pipe portion 37. May be.

  Referring to FIG. 4, at least a part of one exhaust gas sensor 33 in the vehicle width direction is hidden by the vertical pipe portion 37 of one exhaust pipe 35 arranged outside the exhaust gas sensor 33 in the vehicle width direction. Further, at least a part of one exhaust gas sensor 33 in the vehicle width direction is hidden by the vertical pipe portion 37 of the other exhaust pipe 35. In this way, one exhaust gas sensor 33 is hidden by the exhaust pipes 35 from both sides in the vehicle width direction. Further, at least a part of the exhaust gas sensor 33 is hidden by the upper pipe portion 36 of the exhaust pipe 35 arranged above the exhaust gas sensor 33. By hiding the exhaust gas sensor 33 in this way, the appearance is improved.

  As shown most clearly in FIG. 4, the exhaust gas sensor 33 is inclined with respect to the vehicle body width direction so that the front end side is located rearward of the base end side in plan view. The same applies to the posture of the guard body 34 in plan view. That is, the postures of the exhaust gas sensor 33 and the guard body 34 are tilted rearward with respect to the vehicle body width direction. Due to this rearward inclination, the front surface projected areas (see FIG. 5) of the exhaust gas sensor 33 and the guard body 34 are reduced. As a result, it is possible to reduce the probability that foreign matter such as rolled-up mud or sand collides with the exhaust gas sensor 33. That is, the exhaust gas sensor 33 can be protected by setting such a posture. Further, since the postures of the exhaust gas sensor 33 and the guard body 34 are tilted rearward with respect to the vehicle body width direction, the exhaust gas sensor 33 and the guard body 34 are hidden by the vertical pipe portion 37 of the exhaust pipe 35 when viewed from the front of the vehicle. Hateful. As a result, the vertical pipe portion 37 of the exhaust pipe 35 has a cleaner appearance, and the appearance of the motorcycle 1 is improved. In a vehicle equipped with an air-cooled engine that is not provided with a radiator as in the present embodiment, the exhaust gas sensor 33 can be made inconspicuous and the exhaust pipe 35 can be conspicuous in a front view of the vehicle, which improves the appearance. The effect can be enhanced. Further, by disposing the exhaust gas sensor 33 so as to be inclined rearward, the vehicle width direction interval between the down frame 13 and the exhaust gas sensor 33 can be widened, and the vehicle body frame 10 and the exhaust gas sensor 33 interfere with each other. It becomes easy to prevent.

  The pedestal portion 37d is welded to the exhaust pipe 35 so that the axis of the through hole 37c is inclined rearward as it goes inward in the vehicle width direction. In other words, the flat portion 37b of the exhaust pipe 35 is inclined so as to extend outward in the vehicle width direction from the front end toward the rear. As a result, the exhaust gas sensor 33 can be arranged so as to incline rearward as it goes inward in the vehicle width direction.

  The exhaust gas sensor 33 is arranged in the vertical pipe portion 37 located above the lower pipe portion 38. As a result, it is possible to prevent the scattered matter splashing from the ground from colliding with the exhaust gas sensor 33.

  As described above, the exhaust gas sensor 33 and the guard body 34 are fixed to the vertical pipe portion 37 of the exhaust pipe 35, and the vertical pipe portion 37 extends in the vertical direction. Even if liquid is accumulated in the exhaust pipe 35, the liquid does not stop in the vertical pipe portion 37, so that the exhaust gas sensor 33 can be prevented from being flooded.

  The vertical pipe portion 37 of the exhaust pipe 35 to which the exhaust gas sensor 33 and the guard body 34 are fixed is arranged adjacent to the lower pipe portion 15 of the down frame 13. As shown most clearly in FIG. 3, the harness 41 extending from the exhaust gas sensor 33 is routed along the rear side surface of the vertical pipe portion 14 of the down frame 13 and arranged between the vertical pipe portions 14 of the down frame 13. Connected to the control unit 43. By arranging along the rear side surface of the vertical pipe portion 14, especially when the motorcycle 1 is viewed from the front, the harness 41 extending from the exhaust gas sensor 33 is difficult to see, and the appearance of the motorcycle 1 is improved. ..

  The exhaust gas sensor 33 is detachably attached to the exhaust pipe 35 by screwing a male screw 33d and a female screw 37e, and the guard body 34 is provided between the male screw portion 33b of the exhaust gas sensor 33 and the female screw portion 37b fixed to the exhaust pipe 35. It is fixed to the exhaust pipe 35 by being sandwiched. Therefore, the exhaust gas sensor 33 can be attached to and detached from the exhaust pipe 35. Therefore, when the guard body 34 is deformed or discolored due to the collision with the obstacle, the guard body 34 can be replaced more easily than when the guard body 34 is welded to the exhaust pipe 35.

  The present invention is not limited to the embodiment described above, and various modifications can be made as listed below.

  For example, in the exhaust gas sensor 33, the exhaust pipe 35 may be attached at a position other than the vertical pipe portion 37. For example, the exhaust gas sensor may be attached at a position after the plurality of exhaust pipes are collected by the collecting pipe and before being connected to the exhaust muffler.

  The exhaust gas sensor may be a linear sensor that obtains an output according to a continuous change in oxygen concentration. Further, the exhaust gas sensor may detect not the oxygen concentration but the NOx gas concentration, PM, PN, or the temperature of the exhaust gas.

  The protective portion of the guard body may be cylindrical so as to cover the entire circumference of the exhaust gas sensor, that is, the upper and lower regions and the front and rear regions.

  The present invention can be applied to a motorcycle including an engine cowl including a half cowl and a bikini cowl, and similar effects can be obtained. Further, the present invention can be applied to a vehicle having a frame structure different from that of the embodiment. The present invention can be applied to an engine including one cylinder or three or more cylinders. Furthermore, the present invention can be applied to a motorcycle equipped with a water-cooled engine.

  The structure for detachably fixing the exhaust gas sensor to the exhaust pipe may be different from that of the embodiment. For example, a plate may be fixed to the exhaust gas sensor and this plate may be fastened to the pedestal portion on the exhaust pipe side.

  The structure for preventing the guard body from rotating is not limited to that of the embodiment. For example, a protrusion may be formed on one of the pedestal and the guard body, and a recess into which the protrusion fits may be formed on the other. By fitting the protrusion into the recess, the guard body is prevented from being angularly displaced with respect to the pedestal.

  The structure for preventing the guard body from rotating may be as follows. The guard body is provided with a first facing surface facing one side in the circumferential direction of the axis of the through hole, and the pedestal part is arranged in the state where the guard body is coaxially arranged and from the other side in the circumferential direction with respect to the first facing surface. The first face to be opposed is provided. Further, the guard body has a second facing surface facing the other side in the circumferential direction of the axis of the through hole, and the pedestal portion has one side in the circumferential direction with respect to the second facing surface in a state where the guard body is coaxially arranged. The second opposed surface facing from the side is provided. When the guard body is about to be angularly displaced to one of the walks around the axis of the through hole, the first facing surface abuts the first facing surface, and the movement of the guard body is blocked. On the other hand, when the guard body is about to be angularly displaced to the other side of the walking of the axis of the through hole, the second facing surface abuts the second facing surface, and the movement of the guard body is blocked.

  Each of the facing surfaces and each of the facing surfaces may be formed by any of unevenness. Further, each facing surface and each facing surface may be formed on the outer peripheral portion of the guard body or the pedestal portion, or may be formed on the inner side of the outer peripheral portion. In the above-described embodiment, it can be formed by bending the protrusion-shaped detent portion 34h having each facing surface of the guard body 34, and can be formed together with the molding process of the guard body 34, for example, the drawing process. It can be easily formed.

1 motorcycle (saddle-type vehicle)
10 Body frame 20 Engine 21R, 22L Cylinder 30 Exhaust device 33R, 33L Exhaust gas sensor 33a Housing 33b Male screw part 33c Exterior part 33d Male screw 33e Nut-like part 33f Sensing part 34 Guard body 34a Supported part 34b Through hole 34c L protecting part 35R, 35R Exhaust pipes 36R, 36L Upper pipe part (first part)
37R, 37L Vertical pipe part (second part)
37c Through hole 37d Pedestal part 37h Cutout part 37e Female screw 41 Harness 42 Packing

Claims (10)

An exhaust pipe connected to the exhaust port of the engine,
An exhaust gas sensor for detecting components in exhaust gas,
And a guard body for the exhaust gas sensor,
The engaged portion provided in the exhaust gas sensor is screwed into the engaging portion provided in the exhaust pipe, whereby the exhaust gas sensor is fixed to the exhaust pipe,
The straddle-type vehicle in which the guard body is fixed to the exhaust pipe by being sandwiched between the exhaust gas sensor and the engaging portion.   The exhaust gas sensor and the guard body are fixed to an inner portion of the exhaust pipe in the vehicle width direction, project from the exhaust pipe inward in the vehicle width direction, and the exhaust pipe when viewed from the outside in the vehicle width direction. The straddle-type vehicle according to claim 1, which is hidden in the.   The straddle-type vehicle according to claim 2, wherein the exhaust gas sensor is inclined with respect to the vehicle width direction such that the front end side is located rearward of the base end side in a plan view. The exhaust pipe includes a first portion having one end connected to the exhaust port, and a second portion having one end connected to the other end of the first portion and extending in the vertical direction,
The straddle-type vehicle according to any one of claims 1 to 3, wherein the exhaust gas sensor and the guard body are fixed to the second portion. The second portion of the exhaust pipe is disposed adjacent to one of the pair of down frames,
The straddle-type vehicle according to claim 4, wherein the harness extending from the exhaust gas sensor is arranged along the one down frame. A harness extends from the end of the exhaust gas sensor opposite to the engaged portion,
The guard body is
A supported portion sandwiched between the exhaust gas sensor and the engaging portion,
A protective portion having a base end connected to the supported portion, covering the exhaust gas sensor, and extending along the exhaust gas sensor;
The straddle-type vehicle according to any one of claims 1 to 5, wherein a width of the protection portion decreases from the base end toward the tip.   The straddle-type vehicle according to claim 6, wherein the tip of the protection portion of the guard body is curved in a direction away from the exhaust gas sensor.   The straddle-type vehicle according to claim 6 or 7, wherein the guard body includes a rotation stop portion for stopping rotation of the engaged portion of the guard body around the central axis with respect to the exhaust gas sensor. The exhaust pipe includes a plurality of exhaust pipes arranged side by side in the vehicle width direction,
The straddle-type vehicle according to any one of claims 1 to 8, wherein the gas sensor and the guard body are fixed to the exhaust pipes, respectively. An exhaust pipe connected to the exhaust port of the engine,
An exhaust gas sensor for detecting components in exhaust gas,
Equipped with
The exhaust gas sensor is fixed to an inner portion of the exhaust pipe in the vehicle width direction, protrudes from the exhaust pipe inward in the vehicle width direction, and is hidden by the exhaust pipe when viewed from the outside in the vehicle width direction, Saddle-type vehicle.

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