ENGINE STRUCTURE

Abstract

The present invention relates to an engine structure (4), which includes a cylinder part (41) and a transmission part; the cylinder part (41) includes an intake port (414) and an exhaust port, as well as a timing chain sprocket compartment (419); the air filter (6) includes an intake tube (61) and is connected to the intake port (414); the exhaust port is connected to an exhaust device (7) and has a secondary air inlet hole; the latter is connected to a secondary air unit (8); the secondary air unit (8) includes an electromagnetic valve (81) and a one-way valve (83) as well as a secondary air duct (82), and the latter includes an inlet opening and an outlet opening, the outlet opening being connected to the secondary air inlet hole of the exhaust port; The solenoid valve (81) is placed at a distance from the exhaust port.Figure for the summary: Fig. 3.

Description

Title of the invention: ENGINE STRUCTURE TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates generally to an engine structure, and more particularly to an engine structure for shortening the overall length of a secondary air duct of a secondary air unit, while preventing a solenoid valve from being damaged by a heat back impact caused by a combustion explosion of a cylinder part.

[0002] DESCRIPTION OF THE PRIOR ART

[0003] The technical field in which internal combustion engines use secondary air to optimize the exhaust gases from the combustion explosion is known, in particular from patent document TW559228. The applicant is continuing the development of a structure which optimizes the secondary air supply to the engine. Summary of the invention

[0004] Problems to solve

[0005] The main objective of the present invention is to provide an engine structure which shortens the overall length of a secondary air duct of a secondary air unit, while preventing a solenoid valve from being damaged by a heat return impact caused by the combustion explosion of a cylinder part.

[0006] Technical Solutions to Such Problems

[0007] For such an objective, some technical solutions of the present invention provide an engine structure, wherein the engine comprises a cylinder part and a transmission part; the cylinder part comprises a cylinder body and a cylinder head arranged on the cylinder body; the cylinder part comprises an intake port and an exhaust port and a timing chain sprocket compartment; the intake port is connected to an air filter, and the air filter comprises an intake tube, and the intake tube is connected to the intake port; the exhaust port is connected to an exhaust device, the exhaust port having a secondary air introduction hole; the secondary air introduction hole is connected to a secondary air unit;the secondary air unit comprises an electromagnetic valve and a one-way valve, and the secondary air duct connects the electromagnetic valve and the one-way valve, the secondary air duct comprising an inlet opening and an outlet opening, the outlet opening being connected to the secondary air introduction hole of the port; exhaust; the electromagnetic valve is arranged remotely from the exhaust port side.

[0008] Effectiveness of the invention

[0009] The efficiency that the present invention can achieve with certain technical solutions is that the total length of the secondary air duct of the secondary air unit is shortened, while the electromagnetic valve is moved away from the secondary air introduction hole of the exhaust port so as to avoid damage of the electromagnetic valve caused by a heat return impact resulting from the combustion explosion of the cylinder part.

[0010] According to another aspect of the invention, a chain sprocket and a chain and a chain tensioner are arranged in the chain sprocket compartment, and the cylinder part is provided with a chain tensioner mounting seat; the electromagnetic valve is arranged on one side of the cylinder part where the chain tensioner mounting seat is mounted.

[0011] According to another aspect of the invention, the electromagnetic valve and the one-way valve of the secondary air unit are respectively arranged on two sides of the cylinder part of the engine.

[0012] According to another aspect of the invention, the secondary air duct comprises an inlet opening, and the secondary air duct is communicated with the intake tube through the inlet opening.

[0013] According to another aspect of the invention, the electromagnetic valve is connected by a mounting bracket to the outside of the cylinder portion, and one end of the mounting bracket is fixed to the mounting seat of the chain tensioner.

[0014] According to another aspect of the invention, for observation from an upper side of the engine, the secondary air duct runs around two sides of the intake tube of the air filter; after being connected to the intake tube, the secondary air duct runs from a left side of the engine to a right side of the engine to connect to the electromagnetic valve; the secondary air duct runs from the side of the electromagnetic valve to the left side of the engine to connect to the one-way valve.

[0015] According to another aspect of the invention, the one-way valve is arranged at a distance from the cylinder head and is located at one of the sides of the body of the engine cylinder.

[0016] According to another aspect of the invention, the secondary air duct connected between the one-way valve and the secondary air introduction hole of the exhaust port is a metal tube.

[0017] According to another aspect of the invention, the inlet opening of the secondary air duct is connected to a three-way tube, and the remaining two ends of the three-way tube are respectively connected to a fuel release tube of the fuel tank and the intake tube of the air filter. Brief description of the drawings

[0018] [Fig.l] [Fig.l] is a schematic side elevational view of a saddled motorcycle according to the present invention.

[0019] [Fig.2] [Fig.2] is an exploded view of a motor and a solenoid valve of a secondary air unit according to the present invention.

[0020] [Fig.3] [Fig.3] is a plan view of the engine according to the present invention.

[0021] [Fig.4] [Fig.4] is a partial sectional view of the engine according to the present invention.

[0022] [Fig.5] [Fig.5] is an exploded view of the secondary air unit and a three-way tube according to the present invention.

[0023]

[0024] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0025] For a better understanding of the structure of the present invention and the effectiveness achieved thereby, a description will be provided below with reference to the drawings:

[0026] Firstly, with reference to [Fig.l], it appears that an engine according to the present invention is applicable to a vehicle provided with an internal combustion engine. In the following, the vehicle according to the present invention is a saddled motorcycle as an illustrative example; the motorcycle 1 comprises at least a vehicle frame unit 2, a seat cushion 3 arranged on the vehicle frame unit 2, a vehicle body covering unit 5, covering a periphery of the vehicle frame unit 2, and an engine 4 arranged on the vehicle frame unit 2.

[0027] As shown in [Fig.l], it is first noted in the following description that the left and right sides of the vehicle body are defined such that when an operator is seated on the motorcycle 1, the left side of the operator is the left side and the right side of the operator is the right side.A head tube portion 21 is provided on a front side of the vehicle frame unit 2, and a steering mechanism 22 is rotatably mounted on the head tube portion 21, and a down tube portion 23 is connected to the head tube portion 21 so as to extend toward the rear of the vehicle body, and stepped tube portions 24 are connected to a lower side of the down tube portion 23 and arranged in pairs as a left portion and a right portion so as to extend toward the rear of the vehicle body; the stepped tube portions 24 extend toward the rear of the vehicle to form vehicle frame side portions 25 which are arranged in pairs, with . a left portion and a right portion, and the vehicle frame side portions 25 include a rising portion 251 adjacent to the stepped tube portions 24 and an extension portion 252 located in a rear portion of the vehicle body; a front fork unit A is rotatably mounted on a lower side of the head tube portion 21, being constituted of front shock absorbers, and a front wheel FW is rotatably mounted at a lower end of the front fork unit A.

[0028] As illustrated in [Fig.l], the stepped tube portions 24 of the vehicle frame unit 2 which are arranged generally horizontally are provided thereon with a stepped panel 53 of the vehicle body covering unit 5, so that the stepped panel 53 forms a footrest portion B which is generally floating so that the operator can place his feet thereon; the stepped tube portions 24 which are arranged in pairs as a left portion and a right portion, and which are generally horizontal, define between them an interior space in which a fuel tank T which supplies fuel for the combustion explosion carried out in the engine 4, and the engine 4 is connected to the frame unit 2 and is arranged further toward the rear side of the vehicle body than the tank T; the tank T is provided with an activated carbon cartridge Tl which collects and filters the evaporated gases of the fuel.

[0029] As shown in [Fig.l], a seat cushion 3 is arranged on the upper side of the extension portions 252 of the vehicle frame side parts 25 to accommodate the operator sitting thereon, and an article storage box C is provided on the frame side parts 25, to be located on the extension portions 252 and under the seat cushion 3; the motor 4 is mounted on the frame side parts 25, and the motor 4 is non-oscillatingly fixed, or is oscillatingly mounted, on the vehicle frame unit 2. The non-oscillating fixing is taken as an example to describe the motor 4 in the present invention.

[0030] As shown in [Fig.l], the engine 4 comprises a cylinder part 41, a transmission part 42 and a crankcase 43, and the cylinder part 41 extends generally obliquely, toward the front side of the vehicle body and partially protrudes from the rising portions 251 of the vehicle frame side parts 25, namely a part of the cylinder part 41 which extends toward the front side of the vehicle body protrudes further toward the front side of the vehicle body than the rising portions 251 of the vehicle frame side parts 25; the transmission part 42 is located at a right rear side of the cylinder part 41, and a rear end of the transmission part 42 is provided with a power output shaft (not shown in the drawings), which extends in a left-right direction of the vehicle body. vehicle, to be connected to a rear wheel RW, so that the motor 4 drives, via the transmission part 42, the rear wheel RW in rotation.

[0031] As shown in Figures 1, 2, 3 and 4, the cylinder part 41 of the engine 4 comprises a cylinder body 411 and a cylinder head 412 mounted on the cylinder body 411, and a top of the cylinder head 412 is provided and covered with a cylinder head cover 413; the cylinder body 411 is arranged above a crankcase 43, and the transmission part 42 is connected to one side of the crankcase 43;the fresh air required for the combustion explosion of the engine 4 is supplied by an air filter 6, and the outside air, after being filtered and cleaned by the air filter 6, is supplied into the cylinder head 412 through an intake tube 61 connected between the air filter 6 and the cylinder part 41 of the engine 4 to mix with the fuel supplied from the fuel tank T for combustion and explosion inside a combustion chamber (not shown in the drawings) between the cylinder body 411 and the cylinder head 412 of the cylinder part 41, so as to make the engine 4 generate power for the transmission part 42 to drive the rear wheel RW to rotate;the cylinder part 41 (more precisely, on the cylinder head 412) is provided with an intake port 414 for connecting with the intake tube 61 of the air filter 6 and an exhaust port 415 which is located on the opposite side to the intake port 414 for discharging the combustion explosion exhaust gas, and the exhaust port 415 is connected to an exhaust device 7 which discharges the exhaust gas resulting from the combustion explosion carried out in the cylinder part 41 of the engine 4, and the air filter 6 and the exhaust device 7 are respectively arranged on the two sides of the cylinder part 41 of the engine 4;the cylinder part 41 is provided, on a side opposite to the intake port 414 and the exhaust port 415, with an igniter 416 for igniting the combustion explosion, and the cylinder part 41 is provided, on a side opposite to the igniter 416, with a timing chain sprocket compartment 417, and a chain sprocket 4171 and a chain 4172 are mounted in the timing chain sprocket compartment 417, and a chain tensioner 418 is mounted on the cylinder part 41 outside the timing chain sprocket compartment 4172 for tensioning the chain, and more specifically, the chain tensioner 418 penetrates from the intake port 414 into the timing chain sprocket compartment 417, so that a chain tensioner mounting seat 419 is arranged on the side of the inlet port 414 for mounting the chain tensioner 418;the exhaust port 415 of the cylinder part 41 is formed with a secondary air introduction hole 4151 for introducing secondary air, and the secondary air introduction hole 4151 is connected to the secondary air unit 8. ;

[0032] As shown in Figs. 1, 2, 3, 4 and 5, the secondary air unit 8 comprises an electromagnetic valve 81 which controls the supply or stopping of the secondary air, a secondary air duct 82 for the flow of the secondary air, and a one-way valve 83 capable of being controlled by the electromagnetic valve 81 to operate or not; the electromagnetic valve 81 is connected by a mounting bracket 84 to the cylinder part 41 of the engine 4, and more specifically, one end of the mounting bracket 84 is fixed to the chain tensioner mounting seat 419, and another end of the mounting bracket 84 receives the electromagnetic valve 81 to be mounted and positioned thereon; for an observation made in a top plan view of the engine 4 (as illustrated in [Fig.3]),the electromagnetic valve 81 and the one-way valve 83 are arranged generally on the same line of the engine 4 in a left-right direction; the electromagnetic valve 81 is itself mounted on the side of the compartment 417 of the timing chain sprocket of the cylinder part 41 to be close to the exhaust device 7; the secondary air duct 82 comprises an inlet opening 821 and an outlet opening 822, and the inlet opening 821 of the secondary air duct 82 is connected to the intake tube 61 of the air filter 6, and the outlet opening 822 of the secondary air duct 82 is in communication with the secondary air introduction hole 4151 of the exhaust port 415 of the cylinder part 41; thus, when a negative pressure is induced in the cylinder part 41 due to a combustion explosion, external fresh air required for the combustion explosion in the cylinder part 41 is supplied from the air filter 6,the clean air, after being purified by the air filter 6, moves through the intake tube 61 so as to enter the secondary air unit 8 from the inlet opening 821 of the secondary air duct 82; more specifically, in the present invention, the inlet opening 821 of the secondary air duct 82 is connected to the intake tube 61 of the air filter 6, and the inlet opening 821 of the secondary air duct 82 is not directly connected to the intake tube 61 of the air filter 6 and is instead connected to a three-way tube 85 first, and the three-way tube 85 is implemented as a T-shaped three-way tube in the present invention, and three connecting openings of the three-way tube 85 are respectively connected to the inlet opening 821 of the secondary air duct 82, the intake tube 61 of the air filter 6, and a fuel release tube T1 1 of the activated carbon box T1 of the fuel tank T,and more specifically, fuel gas evaporating in the fuel tank T passes through the activated carbon box Tl to pass through the fuel release tube Tl 1 so as to move, in combination with the clean outside fresh air introduced through the intake tube 61 of the air filter 6, into the secondary air unit 8 through the inlet opening 821 of the secondary air duct 82; , and finally supply from the outlet opening 822 of the secondary air duct 82 into the secondary air introduction hole 4151 of the exhaust port 415 of the cylinder part 41 to then supply the exhaust device 7 for secondary combustion, thereby purifying the exhaust gas of the combustion explosion of the cylinder part 41; more specifically, in the implementation of the present invention, in an idling state of the engine 4, the electromagnetic valve 81 is controlled by an engine control unit (ECU) of the engine 4, and the electromagnetic valve 81 then controls the operation of the one-way valve 83, and when the engine 4 is not in an idling state (normal operation, namely the motorcycle 1 is traveling normally), the electromagnetic valve 81 directly controls the operation of the one-way valve 83;the cleaned air, which is purified by the air filter 6, passes through the intake tube 61 so as to move in combination with the fuel gas evaporating in the fuel tank T through the three-way tube 85, to be supplied together into the secondary air unit 8 through the inlet opening 821 of the secondary air duct 82; the inlet opening 821 of the secondary air duct 82 is connected by the three-way tube 85 to the intake tube 61 of the air filter 6 to thereby connect to the electromagnetic valve 81; it is noted that in the present invention, the three-way tube 85 is implemented in a male-female junction configuration, so that the pattern of the main electrical wiring configuration of the motorcycle 1 can be changed to reduce the component arrangement and the suction noise level;there is also a section of the secondary air duct 82 connected between the one-way valve 83 and the secondary air introduction hole 4151 of the exhaust port 415, and the section of the secondary air duct 82 between the one-way valve 83 and the secondary air introduction hole 4151 of the exhaust port 415, which helps to keep the secondary air introduction hole 4151 of the exhaust port 415 and the one-way valve 83 at a predetermined distance from each other, is made with a metal material in the present invention, so that the secondary air duct 82 can function as a buffer to reduce the damage of the one-way valve 83 caused by the impact of the high-temperature hot gases from the exhaust port 415, and also help to improve the stability of the engine 4 at idling;more specifically, the secondary air duct 82, after being connected to the intake tube 61, goes around the left side of the engine 4 (G indicating the left side in [Fig. 3]) to the right side of the engine 4 (D indicating the right side in [Fig. 3]) to connect to the electromagnetic valve 81; the secondary air duct 82 then goes around the electromagnetic valve 81 on the left side of the engine 4 to connect to the one-way valve 83; after the one-way valve 83, the outlet opening 822; of the secondary air duct 82 is then connected to the secondary air introduction hole 4151 of the exhaust port 415; the one-way valve 83 is arranged on the cylinder body 411 which is on the opposite side to the compartment 417 of the timing chain sprocket of the cylinder part 41, the electromagnetic valve 81 and the one-way valve 83 being respectively on two sides of the cylinder part 41, and for the observation made from the front side of the vehicle body of the engine 4 (as shown in [Fig.3]), the one-way valve 83 and the air filter 6 at least partially overlap in a front-rear direction of the vehicle body, and the one-way valve 83 is a valve body which can be opened in a direction toward the secondary air introduction hole 4151, in order to prevent a backfire or a high-temperature flame resulting from the combustion explosion of the cylinder part 41 from the rear rushing into the secondary air duct 82 and to shorten the total length of the secondary air duct 82 of the secondary air unit 8. .

[0033] As shown in [Fig.l], the vehicle body covering unit 5 comprises a front fairing 51 surrounding the steering mechanism 22, a knee protector 52 arranged behind the front fairing 51, a stepped panel 53 placed between the steering mechanism 22 and the seat cushion 3, vehicle body side covers 54 being laid on, and covering, two sides of the vehicle frame side parts 25 below the seat cushion 3 of the motorcycle 1.

[0034] The present invention is configured such that an engine 4 comprises a cylinder part 41 and a transmission part 42; the cylinder part 41 comprises a cylinder body 411 and a cylinder head 412 arranged on the cylinder body 411; the cylinder part 41 comprises an intake port 414 and an exhaust port 415, and a timing chain sprocket compartment 417; the intake port 414 is connected to an air filter 6, and the air filter 6 comprises an intake tube 61, and the intake tube 61 is connected to the intake port 414; the exhaust port 415 is connected to an exhaust device 7, and the exhaust port 415 is formed with a secondary air introduction hole 4151; the secondary air introduction hole 4151 is connected to the secondary air unit 8;The secondary air unit 8 comprises an electromagnetic valve 81 and a one-way valve 83, and a secondary air duct 82 connecting the electromagnetic valve 81 and the one-way valve 83, and the secondary air duct 82 comprises an inlet opening 821 and an outlet opening 822, and the outlet opening 822 is connected to the secondary air introduction hole 4151 of the exhaust port 415; the electromagnetic valve 81 is arranged at a distance from the exhaust port 415; and thus, an overall length of the secondary air duct 82 of the secondary air unit 8 is shortened, and damage; of the electromagnetic valve 81 caused by the heat return impact resulting from the combustion explosion of the cylinder part 41 is avoided.

[0035] In summary, by means of the above structure, the present invention truly alleviates the disadvantages of the prior art and achieves the desired objectives and effectiveness, and evidently meets the requirements of use, novelty and inventiveness for a patent. As such, an application is filed and the grant of a patent is respectfully requested.

Claims

Claims

1. An engine structure, characterized in that the engine (4) comprises a cylinder part (41) and a transmission part (42) connected to the cylinder part (41); the cylinder part (41) comprises a cylinder body (411) and a cylinder head (412) mounted on the cylinder body (411); the cylinder part (41) comprises an intake port (414) and an exhaust port (415) and a timing chain sprocket compartment (417); the intake port (414) is connected to an air filter (6), the air filter (6) comprising an intake tube (61), the intake tube (61) being connected to the intake port (414); the exhaust port (415) is connected to an exhaust device (7), the exhaust port (415) having a secondary air introduction hole (4151); the secondary air introduction hole (4151) is connected to a secondary air unit (8);the secondary air unit (8) comprises an electromagnetic valve (81) and a one-way valve (83), and the secondary air duct (82) connects the electromagnetic valve (81) and the one-way valve (83), the secondary air duct (82) comprising an inlet opening (821) and an outlet opening (822), the outlet opening (822) being connected to the secondary air introduction hole (4151) of the exhaust port (415); the electromagnetic valve (81) is arranged distantly from the side of the exhaust port (415).;

2. An engine structure (4) according to claim 1, characterized in that a chain sprocket (4171) and a chain (4172) and a chain tensioner (418) are arranged in the chain sprocket compartment (417), and the cylinder part (41) is provided with a chain tensioner mounting seat (419); the electromagnetic valve (81) is arranged on one side of the cylinder part (41) where the chain tensioner mounting seat (419) is mounted.

3. Engine structure (4) according to claim 1, characterized in that the electromagnetic valve (81) and the one-way valve (83) of the secondary air unit (8) are respectively arranged on two sides of the cylinder part (41) of the engine (4).

4. An engine structure (4) according to claim 1, characterized in that the secondary air duct (82) comprises an inlet opening (821), and the secondary air duct (82) is communicated with the intake tube (61) through the inlet opening (821).

5. An engine structure (4) according to claim 2, characterized in that the electromagnetic valve (81) is connected by a mounting bracket (84) outside the cylinder portion (41), and one end of the mounting bracket is fixed to the chain tensioner mounting seat (419).

6. An engine structure (4) according to claim 1, characterized in that, for observation from an upper side of the engine (4), the secondary air duct (82) runs around two sides of the intake tube (61) of the air filter (6); after being connected to the intake tube (61), the secondary air duct (82) runs from a left side of the engine (4) to a right side of the engine (4) to connect to the electromagnetic valve (81); the secondary air duct (82) runs from the side of the electromagnetic valve (81) to the left side of the engine (4) to connect to the one-way valve (83).

7. Engine structure (4) according to claim 1, characterized in that the one-way valve (83) is arranged at a distance from the cylinder head (412) and is located at one of the sides of the cylinder body of the engine (4).

8. Engine structure (4) according to claim 1, characterized in that the secondary air duct (82) connected between the one-way valve (83) and the secondary air introduction hole (4151) of the exhaust port (415) is a metal tube.

9. An engine structure (4) according to claim 1, characterized in that the inlet opening (821) of the secondary air duct (82) is connected to a three-way tube (85), and the remaining two ends of the three-way tube (85) are respectively connected to a fuel release tube (Tl 1) of the fuel tank and the intake tube (61) of the air filter (6).