Exhaust device of motorcycle engine

Abstract

The invention relates to an exhaust device of a motorcycle engine. The exhaust device comprises a front pipe, an upstream detector inserted into the front pipe, a silencing unit, a catalyst pipe, an installation module, a traveling detector installed on the installation module and a tail pipe. The silencing unit comprises at least one shell. The catalyst tube comprises a connecting part with a notch. The mounting module comprises a ring body, a separator, a mounting pipe with a mounting port, and a mounting seat arranged at the mounting port. The ring body defines an arrangement opening, and the notch and the installation opening are communicated with each other to jointly form an installation channel which faces outwards to the arrangement opening and is used for the downstream detector to be arranged. The downstream detector can be simply and conveniently installed by an operator under the condition that the structure of the shell is not influenced by the installation channel, so that the downstream detector penetrates through the catalyst tube.

Description

Technical Field

[0001] The present invention relates to an exhaust device, and particularly to an exhaust device for a motorcycle engine. Background Art

[0002] Referring to Figure 1 and Figure 2 , an existing exhaust device 9 for a motorcycle engine includes a front pipe 91 adapted to communicate with an engine (not shown), an upstream exhaust gas sensor 92 inserted into the front pipe 91, a silencing housing 93 defining a space 930 communicating with the front pipe 91 and having a partition 931, a catalytic converter 94 connected to the front pipe 91 and disposed in the space 930, and a downstream exhaust gas sensor 95 penetrating the silencing housing 93 and located downstream of the catalytic converter 94. Among them, the measurement results of the upstream exhaust gas sensor 92 and the downstream exhaust gas sensor 95 can be used to compare with each other to confirm the effect of the catalytic converter 94 in purifying the exhaust gas generated by the engine. In addition, the partition 931 is used to divide the space 930 into two silencing chambers H and allow air flow to achieve a silencing effect.

[0003] However, since the catalytic converter 94 of the existing exhaust device 9 for a motorcycle engine is covered in the silencing housing 93, the downstream exhaust gas sensor 95 needs to penetrate the silencing housing 93 before it can effectively detect the gas flowing in the catalytic converter 94. However, the installation mode that destroys the structure of the silencing housing 93 also forms joints that require additional consideration for anti-blocking and air leakage. When used for a long time, the concern about air leakage becomes more and more obvious. In addition, when the downstream exhaust gas sensor 95 is penetrated and disposed in the silencing housing 93, due to the structural design of the partition 931, the wiring connected to the downstream sensor 95 is easily blocked by the partition 931, resulting in a significant increase in the installation difficulty. Therefore, there is still room for improvement in the existing exhaust device 9 for a motorcycle engine. Summary of the Invention

[0004] [Object to be Achieved by the Present Invention]

[0005] Therefore, the object of the present invention is to provide an exhaust device for a motorcycle engine that can improve airtightness and simplify installation in response to the necessary sensors.

[0006] [Technical Means for Solving the Problem]

[0007] Thus, the exhaust device for a motorcycle engine of the present invention includes a front pipe adapted to be disposed downstream of the engine, a silencing unit disposed downstream of the front pipe, a catalytic pipe disposed downstream of the front pipe, an installation module connecting the silencing unit and the catalytic pipe, a downstream detector removably installed on the installation module, and a tail pipe connecting the silencing unit.

[0008] The muffling unit includes at least one housing that defines a chamber for disposing the catalyst tube and communicating with the tail pipe.

[0009] The catalyst tube includes a body portion connected to the front tube and defining a receiving space suitable for disposing at least one catalyst block, and a connecting portion located downstream of the body portion and having a notch penetrating therethrough in the radial direction.

[0010] The mounting module includes an annular body connected to the at least one housing and defining a flow space around an axis, a partition member connected to the annular body and blocking a part of the flow space, a mounting tube penetrating through the partition member in a direction parallel to the axis for the connecting portion to pass through and having a mounting opening penetrating therethrough in the radial direction, and a mounting seat disposed at the mounting opening. Wherein, the annular body defines a setting opening in the radial direction, and the notch and the mounting opening communicate with each other to jointly form a mounting channel facing outward toward the setting opening.

[0011] The downstream detector is mounted on the mounting seat of the mounting module, passes through the mounting channel and extends to the connecting portion of the catalyst tube.

[0012] Furthermore, the exhaust device of the motorcycle engine of the present invention includes a front tube disposed downstream of the engine, a muffling unit disposed downstream of the front tube, a mounting module connected to the muffling unit, a connecting portion connecting between any two of the housings and connecting the muffling unit, a downstream detector disposed in the mounting module, and a tail pipe connected to the muffling unit.

[0013] The muffling unit includes a plurality of housings axially connected to each other and jointly defining a chamber.

[0014] The catalyst tube includes a body portion connected to the front tube and axially defining a receiving space configured with at least one catalyst block, and a connecting portion located downstream of the body portion and having a notch defined by penetrating outward perpendicular to the axial direction.

[0015] The mounting module connects between any two of the housings and connects the connecting portion of the muffling unit.

[0016] The downstream detector passes through the notch.

[0017] The tail pipe communicates with the chamber.

[0018] In some embodiments of the present invention, the projection range of the mounting opening in the radial direction toward the notch is completely located within the notch, and the notch extends in a direction parallel to the axis for a distance greater than the length of the mounting opening in the same direction.

[0019] Some embodiments of the present invention, wherein the separator has two partition portions spaced apart from each other along the axis, and two ramp portions connected between the partition portions and jointly defining a groove communicating with the setting port with the partition portions, and the mounting seat of the mounting module is disposed in the groove.

[0020] Some embodiments of the present invention, wherein at least one of the ramp portions of the separator extends downwardly and obliquely away from the mounting tube relative to the horizontal plane, and the mounting tube is spaced apart from the ramp portions.

[0021] Some embodiments of the present invention, the motorcycle includes a rear swing arm, a brake, a wire fixing bracket, and a brake wire extending from the brake towards the wire fixing bracket and spaced apart from the silencing unit, wherein the opening direction of the setting port faces the motorcycle.

[0022] Some embodiments of the present invention, wherein the downstream detector includes a detection line disposed at one end away from the mounting seat and extending towards the motorcycle at a distance from the silencing unit, and the detection line is selectively fixed to at least one of the brake wire or the wire fixing bracket.

[0023] Some embodiments of the present invention, wherein the distance between the mounting module and the downstream end of the front tube is greater than the distance between the mounting module and the downstream end of the tail tube.

[0024] Some embodiments of the present invention, wherein the mounting tube has a main body portion extending in a direction parallel to the axis, two fitting ports respectively located at opposite ends of the main body portion, and two constricted portions respectively disposed around the fitting ports and used for tightly engaging with the outside of the connecting portion.

[0025] Some embodiments of the present invention, wherein the silencing unit further includes a plurality of partitions disposed inside the at least one housing and dividing the chamber into a plurality of expansion chambers, the ring body is composed of two axially symmetric annular blocks, and the separator is composed of two axially symmetric separator sheets, and the annular block and the separator sheet on the same side are integrally formed.

[0026] [Effects achievable by the present invention]

[0027] The installation channel jointly defined by the installation port and the setting port of the installation module and the notch of the catalyst tube allows the operator to directly insert the downstream detector into the notch of the catalyst tube. Compared with the existing method of configuring a downstream exhaust gas sensor in the exhaust device of a motorcycle engine, this embodiment does not require damaging the structure of the housing and can improve airtightness.

[0028] In some embodiments of the present invention, when the projection range of the installation opening radially towards the notch is completely located within the notch, a displacement margin for thermal expansion and contraction of the connecting portion of the catalyst tube can be provided, ensuring that the downstream detector can smoothly penetrate into the installation opening and the notch.

[0029] In some embodiments of the present invention, the groove defined by the partition portions and the slope portions helps the operator to conveniently insert and position the downstream detector between the installation opening and the notch, improving the installation accuracy and processing convenience.

[0030] In some embodiments of the present invention, when at least one of the slope portions extends downwardly away from the installation tube relative to the horizontal plane, it helps to discharge the water vapor accumulated in the groove, adapting to situations such as rainy days and preventing rusting of the ring body and the partition member of the installation module due to water vapor accumulation.

[0031] In some embodiments of the present invention, when the direction of the setting opening faces the motorcycle and the detection line is arranged on the brake line at the same time, the downstream detector is located between the muffling unit and the motorcycle, effectively shielding the downstream detector and improving the appearance. It can also assist in fixing and connecting the signal line connected to the downstream detector through the brake line, improving the processing convenience for the operator.

[0032] In some embodiments of the present invention, when the constricted portions of the installation tube are used to tightly engage with the outer side of the connecting tube, the airtightness when the installation tube is connected to the catalyst tube can be improved, thereby enhancing the accuracy of the downstream detector in detecting the exhaust gas and the reliability of the feedback signal.

[0033] In some embodiments of the present invention, when the ring body is composed of two annular blocks, the partition member is composed of two partition plates, and the annular block and the partition plate on the same side are integrally formed, since each annular block and each partition plate are the same as each other, it helps the operator to mass-produce the annular blocks and the partition plates, and can quickly dock the two different annular blocks and partition plates with each other, and cooperate with the installation tube to quickly assemble the installation module, achieving the effect of improving the production convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, where:

[0035] Figure 1 is a schematic diagram showing an exhaust device of an existing motorcycle engine;

[0036] Figure 2It is a cross-sectional view from a side viewing angle, showing that a downstream detector of the existing exhaust device of a motorcycle engine penetrates a silencing housing;

[0037] Figure 3 It is a side view, showing an embodiment of the exhaust device of the motorcycle engine of the present invention;

[0038] Figure 4 It is a schematic diagram, showing the connection relationship between this embodiment and a motorcycle;

[0039] Figure 5 It is a side view, showing the connection relationship between an installation module of this embodiment and a front pipe, a silencing unit, a catalytic converter pipe, a downstream detector and a tail pipe;

[0040] Figure 6 It is a cross-sectional view from a side viewing angle, together with Figure 5 showing the connection relationship between the front pipe, the silencing unit, the catalytic converter pipe, the installation module, the downstream detector and the tail pipe;

[0041] Figure 7 It is a three-dimensional view, showing an annular body, a partition member and an installation pipe of the installation module;

[0042] Figure 8 It is a cross-sectional view from a side viewing angle, together with Figure 7 showing the connection relationship between two necked-down portions of the installation pipe and a connection portion of the catalytic converter pipe;

[0043] Figure 9 It is an exploded three-dimensional view, together with Figure 7 showing that the annular body is composed of two axially symmetric annular blocks in the front and rear, and the partition member is composed of two axially symmetric partition plates in the front and rear; and

[0044] Figure 10 It is a schematic diagram from a side viewing angle, together with Figure 6 and Figure 7 showing that the projection range of an installation opening of the installation pipe along the radial direction towards a notch is completely located within the notch of the connection portion.

[0045] List of reference numerals

[0046] 1 ··· Front pipe

[0047] 11 ··· Pipe body

[0048] 12 ··· Joint

[0049] 13 ··· Fastener

[0050] 3 ··· Silencing unit

[0051] 30 ··· Chamber

[0052] 31 ··· Housing

[0053] 311 ··· First housing

[0054] 3110 · First cavity

[0055] 312 ··· Second housing

[0056] 3120 · Second cavity

[0057] 313 ··· Third housing

[0058] 3130 · Third cavity

[0059] 32 ··· Partition board

[0060] 4 ··· Catalyst tube

[0061] 40 ··· Accommodating space

[0062] 41 ··· Catalyst block

[0063] 42 ··· Body part

[0064] 42A ··· Diverging tube

[0065] 42B ··· Converging tube

[0066] 43 ··· Connecting part

[0067] 430 ··· Notch

[0068] 5 ··· Installation module

[0069] 50 ··· Flow-through space

[0070] 51 ··· Ring body

[0071] 511 ··· Ring-shaped block

[0072] 52 ··· Partition member

[0073] 521 ··· Partition board part

[0074] 522 ··· Slope part

[0075] 523 ··· Partition plate

[0076] 53 ··· Installation pipe

[0077] 530 ··· Installation opening

[0078] 531 ··· Main body part

[0079] 532 ··· Fitting opening

[0080] 533 ··· Reduced diameter part

[0081] 54 ··· Mounting base

[0082] 55 ··· Setting port

[0083] 56 ··· Groove

[0084] 6 ····· Downstream detector

[0085] 61 ··· Detection line

[0086] 7 ····· Tail pipe

[0087] E ····· Engine

[0088] L ····· Axis

[0089] M ····· Motorcycle

[0090] M1 ··· Rear swing arm

[0091] M2 ··· Brake

[0092] M3 ··· Line fixing bracket

[0093] M4 ··· Brake line

[0094] P ····· Installation channel

[0095] X ····· Finished module. Detailed implementation manner

[0096] Refer to Figure 3 、 Figure 4 and Figure 5, An embodiment of the exhaust device of the motorcycle engine of the present invention includes a front pipe 1 adapted to be disposed downstream of an engine E of a motorcycle M, an upstream detector inserted into the upstream of the front pipe 1 (not shown in the figure because it is blocked by the housing of the motorcycle M), a silencing unit 3 disposed downstream of the front pipe 1, a catalytic pipe 4 disposed downstream of the front pipe 1, a mounting module 5 connecting the silencing unit 3 and the catalytic pipe 4, a downstream detector 6 mounted on the mounting module 5, and a tail pipe 7 connecting the silencing unit 3. The motorcycle M has a rear swing arm M1, a brake M2 disposed on the rear swing arm M1, a wire fixing bracket M3 disposed on the rear swing arm M1 and used to collect a main wiring (not shown in the figure), and a brake wire M4 extending from the brake M2 toward the wire fixing bracket M3 and spaced apart from the silencing unit 3. In this embodiment, the brake M2 can be adjusted to a disc brake or a drum brake as required, and the wire fixing bracket M3 can also illustratively mount the engine E as long as the brake wire M4 and the main wiring can be sorted and collected, and its mounting position is not limited in any way. The brake wire M4 can be a disc brake wire or a drum brake wire. Preferably, the aforementioned disc brake can be disposed on the rear swing arm M1 as shown in Figure 3 . The aforementioned drum brake is illustratively disposed on the transmission on one side of the rear wheel of the motorcycle M. The wire fixing bracket M3 can be adjusted according to the positions of the aforementioned disc brake and the aforementioned drum brake to assist in effectively sorting and collecting the brake wire M4 and the main wiring. In addition, the operator can fix the brake wire M4 inside the housing or on the main frame of the motorcycle M, and it is not limited to being collected by the wire fixing bracket M3. This embodiment is suitable for purifying the exhaust gas generated by the engine E and guiding the purified exhaust gas to the external environment.

[0097] Refer to Figures 4 to 6 and cooperate with Figure 3, the front pipe 1 includes a pipe body 11 that is connected and extends away from the engine E, a joint 12 sleeved on one side of the pipe body 11 for connecting the silencing unit 3, and a locking member 13 bundled outside the pipe body 11 and the joint 12. Among them, the pipe body 11 can be in any extended shape to adjust the connection according to the position of the engine E. The pipe body 11 and the joint 12 are detachably fixed to each other, which is beneficial to replace the pipe body 11 or the joint 12 separately due to failure or damage, and can reduce the maintenance cost. The locking member 13 is preferably selected from a collar with a screwing function, which helps to prevent the pipe body 11 and the joint 12 from loosening from each other, and can improve the airtightness of the connection between the pipe body 11 and the joint 12; however, in other embodiments, the pipe body 11 and the joint 12 can also be welded to each other, which can not only avoid the possibility of the joint 12 slipping off the pipe body 11, but also further improve the airtightness of the connection between the pipe body 11 and the joint 12. The upstream detector is used to detect the content of harmful substances contained in the exhaust gas generated by the engine E before flowing into the catalyst pipe 4, and the aforementioned harmful substances can be lead, hydrocarbons, nitrogen oxides, sulfur oxides, carbon monoxide, etc.

[0098] The silencing unit 3 is connected to the joint 12 of the front pipe 1, and includes a housing 31 that jointly defines a chamber 30 communicating with the tail pipe 7, and two partitions 32 correspondingly arranged inside the housing 31 and dividing the chamber 30 into three expansion chambers. In this embodiment, based on the flow order of the exhaust gas after flowing out of the connecting portion 43, the housing 31 and the chamber 30 are sequentially partitioned from the direction far from to adjacent to the front pipe 1 into a first housing 311 having a first cavity 3110, a second housing 312 having a second cavity 3120, and a third housing 313 having a third cavity 3130, and the three expansion chambers respectively correspond to the first cavity 3110, the second cavity 3120, and the third cavity 3130. The partitions 32 are simultaneously connected to the outside of the catalyst pipe 4 and used to support the weight of the catalyst pipe 4, so that the catalyst pipe 4 can be inserted and extended along an axis L in the first cavity 3110, the second cavity 3120, and the third cavity 3130.

[0099] The catalyst pipe 4 is disposed in the chamber 30, and includes a body portion 42 that is connected to the joint 12 of the front pipe 1 and defines a receiving space 40 suitable for arranging two catalyst blocks 41 for purifying the aforementioned harmful substances, and a connecting portion 43 located downstream of the body portion 42 and having a notch 430 penetrating radially. Among them, the body portion 42 has a gradually expanding pipe 42A that communicates with the joint 12 and is located upstream of the catalyst blocks 41, and a gradually shrinking pipe 42B that communicates with the connecting portion 43 and is located downstream of the catalyst blocks 41. The notch 430 is as Figure 5It is opened in an elliptical shape parallel to the axis L as shown. In practice, the number of the catalyst blocks 41 is not limited to two, and can also be one or more than two, without any limitation.

[0100] Refer to Figures 7 to 9 and cooperate with Figures 4 to 6 , the installation module 5 is connected between the first housing 311 and the second housing 312, and includes an annular body 51 that defines a flow space 50 around the axis L, a partition 52 that connects to the annular body 51 and blocks part of the flow space 50, an installation pipe 53 that penetrates the partition 52 along the direction parallel to the axis L and is used for the connecting portion 43 of the catalyst tube 4 to pass through and has a radially penetrating installation port 530, an installation seat 54 arranged on the periphery of the installation port 530 for the downstream detector 6 to be configured, a setting port 55 defined radially by the annular body 51, and a groove 56 defined by the partition 52 and communicated with the setting port 55. Wherein, the notch 430 and the installation port 530 are communicated with each other to jointly form an installation channel P that faces outward toward the setting port 55 and is used for the downstream detector 6 to penetrate and be arranged. The partition 52 has two partition parts 521 spaced apart from each other along the axis L, and two slope parts 522 connected between the partition parts 521. The installation pipe 53 is welded to the partition 52, so that the installation pipe 53 can be tightly engaged with the partition parts 521 of the partition 52 and improve the positioning accuracy. The opening direction of the setting port 55 faces the motorcycle M, and can be shielded by components such as the vehicle shell and the footrest of the motorcycle M and the silencing unit 3. In addition to optimizing the overall appearance of this embodiment, it also helps to smoothly arrange the signal wire of the downstream detector 6 inside the vehicle shell and improve the wiring stability. In this embodiment, the groove 56 is exposed to the external environment by being jointly surrounded by the partition parts 521 and the slope parts 522, which helps the operator to accurately weld the installation pipe 53, thereby improving the installation precision of the installation pipe 53.

[0101] Refer to Figures 7 to 9 and cooperate with Figure 5 and Figure 6, the installation pipe 53 has a main body portion 531 extending in a direction parallel to the axis L, two distribution ports 532 respectively located at opposite ends of the main body portion 531, and two reduced-diameter portions 533 respectively disposed on the peripheries of the distribution ports 532 and gradually reducing in diameter axially outward from the main body portion 531 for the connecting portion 43 to penetrate and tightly engage. By tightly engaging the reduced-diameter portions 533 on the outer side of the connecting portion 43, the connection airtightness between the installation pipe 53 and the catalyst tube 4 can be maintained, which helps improve the accuracy of the downstream detector 6 in accurately judging the concentration of harmful substances contained in the exhaust gas flowing in the connecting portion 43 of the catalyst tube 4 and can improve the measurement accuracy of the downstream detector 6. It should be noted that the reduced-diameter portions 533 can also gradually reduce in diameter axially inward from opposite sides of the main body portion 531, and the same effect of tightly engaging the connecting portion 43 can also be achieved.

[0102] The ring body 51 is composed of two annular blocks 511 that are symmetrically arranged front and back along the axis, and the partition member 52 is composed of two partition plates 523 that are symmetrically arranged front and back along the axis. Among them, the annular blocks 511 and the partition plates 523 are detachably butted against each other, and the annular block 511 and the partition plate 523 on the same side are integrally formed to form a mold product X. The mold product X has a symmetric structure in the front and back directions. In addition to being beneficial for operators to carry out mass production, it also helps the operators quickly stack them together, and by quickly passing the installation pipe 53 through and welding it to the mold products X, the installation module 5 can be efficiently assembled, so as to achieve the effect of improving the processing convenience.

[0103] Refer to Figures 7 to 9 And cooperate with Figures 4 to 6 It should be noted that at least one of the inclined portions 522 of the partition member 52 extends downward obliquely away from the installation pipe 53 relative to the horizontal plane, and the installation pipe 53 is spaced apart from the inclined portions 522. In this embodiment, when at least one of the inclined portions 522 extends downward at an angle of 5 degrees away from the installation pipe 53 relative to the horizontal plane, water droplets such as rainwater will flow out along the corresponding inclined portion 522 to the external environment, which can reduce the accumulation of moisture in the groove 56 and prevent metal parts from rusting due to continuous contact with moisture.

[0104] Refer to Figure 10 And cooperate with Figure 4 , Figure 6 And Figure 7, the projection range of the installation opening 530 radially towards the notch 430 is completely within the notch 430, and the notch 430 extends a distance greater than the length of the installation opening 530 in the same direction along the direction parallel to the axis L. Among them, through the structural design of the notch 430 and the installation opening 530, it can effectively respond to the phenomenon of the front and rear displacement of the notch caused by the axial expansion and contraction of the connecting portion 43 of the catalyst tube 4 due to thermal expansion and contraction before and after the engine E starts. It can ensure that when the operator inserts the downstream detector 6 into the installation opening 530, the downstream detector 6 can also smoothly penetrate into the notch 430, improving the processing convenience.

[0105] The downstream detector 6 includes a detection line 61 disposed at one end away from the mounting seat 54 and extending towards the motorcycle M at an interval from the silencing unit 3. The detection line 61 is selectively fixed to at least one of the brake line M4 or the line fixing bracket M3. Among them, the downstream detector 6 is removably mounted on the mounting seat 54 of the mounting module 5 and passes through the mounting channel P and extends to the connecting portion 43 of the catalyst tube 4. The downstream detector 6 is tightly adapted to the mounting seat 54, which can prevent the exhaust gas flowing through the connecting portion 43 of the catalyst tube 4 from escaping to the external environment. When the detection line 61 is collected and arranged in the line fixing bracket M3 together with the brake line M4 and the main wiring, the detection line 61, the brake line M4 and the main wiring will be spaced apart from the high-temperature silencing unit 3. In addition to avoiding the deterioration of the signal line due to high temperature, the gap generated by the spacing also helps to provide the operator with a margin for arranging and configuring the detection line 61, the brake line M4 and the main wiring, which can further optimize the wiring quality. In addition, when the distance between the mounting module 5 and the downstream end of the front pipe 1 is greater than the distance between the mounting module 5 and the downstream end of the tail pipe 7, it helps the upstream detector and the downstream detector 6 to generate a sufficient long measurement interval distance to improve the accuracy of measuring harmful substances.

[0106] The tail pipe 7 axially penetrates the silencing unit 3 and communicates with the flow space 50, and at the same time communicates with one side of the chamber 30 adjacent to the joint 12 of the front pipe 1. In this embodiment, the tail pipe 7 is arranged side by side with the catalyst tube 4 below the catalyst tube 4 and is suitable for discharging the exhaust gas in the chamber 30 to the external environment.

[0107] Refer back to Figures 4 to 6 And cooperate with Figure 3When a rider rides the motorcycle M and starts the engine E, the front pipe 1 will receive the exhaust gas generated by the engine E, and the upstream detector will detect the initial content of harmful substances generated along with the exhaust gas flowing through the front pipe 1. Based on the conveying pressure generated during gas flow, the harmful substances will flow into the accommodation space 40 of the catalyst pipe 4 along with the exhaust gas and pass through the catalyst blocks 41. At this time, the catalyst blocks 41 will adsorb the harmful substances and purify the exhaust gas simultaneously. Due to the fluidity of the gas, the exhaust gas will continue to flow axially from the body portion 42 towards the connecting portion 43. The downstream detector 6 passing through the notch 430 can then measure the content of harmful substances again. By comparing the detection results of the downstream detector 6 with those of the upstream detector, the purification efficiency of the catalyst pipe 4 can be confirmed.

[0108] When the purified exhaust gas flows out of the connecting portion 43 of the catalyst pipe 4 and into the first cavity 3110, due to the conveying inertia of the gas, the purified exhaust gas will flow through the flow space 50 of the mounting module 5 and sequentially flow through the second cavity 3120 to the third cavity 3130, providing a space for the purified high-temperature exhaust gas to flow and expand, achieving a noise reduction effect. The tail pipe 7 passing through the flow space 50, the second cavity 3120, and the third cavity 3130 can, due to the fluidity characteristics of the gas, receive the purified exhaust gas from the third cavity 3130 and then smoothly guide the exhaust gas to the external environment.

[0109] It is worth mentioning that in this embodiment, the number of the housing 31 can also be increased to the fourth housing, the fifth housing, or the sixth housing according to the usage requirements, and there is no specific limitation on the number of partitions of the housing 31. In addition, the mounting module 5 can not only be connected between the first housing 311 and the second housing 312, but also be adjustably connected between the second housing 312 and the third housing 313, or between any two adjacent casings separated by the housing 31. When the mounting module 5 provides an installation space for the downstream detector 6, the overall appearance length and size of this embodiment can be elastically adjusted.

[0110] In summary, in this embodiment of the exhaust device of the motorcycle engine of the present invention, the installation channel P facing the installation port 55 jointly defined by the notch 430 and the installation port 530 allows an operator to smoothly insert the downstream detector 6 into the notch 430 of the catalyst tube 4 without damaging the overall structure of the silencing unit 3. The groove 56 defined by the partition member 52 facilitates partial exposure of the installation tube 53, which is conducive to the operator's convenient installation operation. The constricted portions 533 of the installation tube 53 can be tightly fitted with the connecting portion 43 of the catalyst tube 4, enabling the connecting portion 43 of the installation tube 53 and the catalyst tube 4 to maintain excellent thermal strain freedom and airtightness, which helps to improve the accuracy of the downstream detector 6 in detecting harmful substances. Therefore, the object of the present invention can indeed be achieved.

[0111] The above description is only an embodiment of the present invention and cannot be used to limit the scope of implementation of the present invention. All simple equivalent changes and modifications made according to the claims and the content of the specification of the present invention still fall within the scope covered by the patent of the present invention.

Claims

1. An exhaust device for a motorcycle engine, characterized in that: Include: a front pipe adapted to be disposed downstream of the engine; a muffler unit disposed downstream of the front pipe and comprising at least one shell defining a chamber; a catalyst tube disposed in the chamber and arranged downstream of the front tube, and comprising a main body connected to the front tube and defining a receiving space suitable for disposing at least one catalyst block, and a connecting portion located downstream of the main body and having a radially penetrating notch; a mounting module, connecting the muffler unit and the catalyst tube, and comprising a ring body connected to the at least one shell and defining a flow space around an axis, a partition connected to the ring body and covering part of the flow space, a mounting tube passing through the partition in a direction parallel to the axis and for the connection portion to pass through and having a mounting opening passing through in a radial direction, and a mounting seat arranged at the mounting opening, wherein the ring body defines a setting opening in a radial direction, and the notch and the mounting opening are connected to each other to form a mounting channel facing outwardly toward the setting opening; a downstream detector, which is removably mounted on the mounting seat of the mounting module and passes through the mounting channel and extends to the connecting portion of the catalyst tube; and A tail pipe is connected to the muffler unit and communicated with the chamber.

2. An exhaust device for a motorcycle engine, characterized in that: Include: a front pipe disposed downstream of the engine; a muffler unit, disposed downstream of the front pipe and comprising a plurality of shells connected to each other along the axial direction and jointly defining a chamber; a catalyst tube, disposed downstream of the front tube and arranged in the chamber, the catalyst tube comprising a main body connected to the front tube and defining an accommodating space for at least one catalyst block along the axial direction, and a connecting portion located downstream of the main body and having a slot defined by penetrating outward perpendicularly to the axial direction; A mounting module according to claim 1, connected between any two of the shells and connected to the connecting portion of the muffler unit; a downstream detector, removably disposed on the mounting module and passing through the slot; and A tail pipe is connected to the muffler unit and communicated with the chamber.

3. The exhaust device of a motorcycle engine according to claim 1 or 2, characterized in that: The projection range of the installation opening in the radial direction toward the slot is completely located in the slot; the slot extends in a direction parallel to the axis by a distance greater than the length of the installation opening in the same direction.

4. The exhaust device of a motorcycle engine according to claim 1 or 2, characterized in that: The partition has two partition parts spaced apart from each other along the axis, and two slope parts connected between the partition parts and together with the partition parts, surrounding and defining a groove connected to the setting port, and the mounting seat of the mounting module is set in the groove.

5. The exhaust device for a motorcycle engine according to claim 4, characterized in that: At least one of the slope portions of the partition extends downwardly in a direction away from the mounting tube relative to a horizontal plane, and the mounting tube is spaced apart from the slope portion.

6. The exhaust device of a motorcycle engine according to claim 1 or 2, characterized in that: The motorcycle includes a rear swing arm, a brake, a line fixing frame, and a brake line extending from the brake toward the line fixing frame and spaced apart from the silencer unit, wherein the opening is opened toward the motorcycle.

7. The exhaust device for a motorcycle engine according to claim 6, characterized in that: The downstream detector includes a detection line disposed at an end away from the mounting base and extending toward the motorcycle at a distance from the muffler unit, and the detection line is selectively fixed to at least one of the brake line or the line fixing frame.

8. The exhaust device of a motorcycle engine according to claim 1 or 2, characterized in that: The distance between the mounting module and the downstream end of the front pipe is greater than the distance between the mounting module and the downstream end of the tail pipe.

9. The exhaust device of a motorcycle engine according to claim 1 or 2, characterized in that: The mounting tube has a main body extending in a direction parallel to the axis, two installation openings located at opposite ends of the main body, and two necking portions respectively arranged at the periphery of the installation openings and used for tightly joining the outer side of the connecting portion.

10. The exhaust device of a motorcycle engine according to claim 1, characterized in that: The silencer unit also includes a plurality of partitions arranged on the inner side of at least one shell and dividing the chamber into a plurality of expansion chambers. The ring body is composed of two annular blocks that are symmetrical front and back in the axial direction, and the partition is composed of two partition plates that are symmetrical front and back in the axial direction. The annular block and the partition plate on the same side are integrally formed.

Images