JPH018662Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to an exhaust system for a vehicle engine.

(Prior Art) As described in Japanese Patent Application Laid-open No. 56-92322, this type of device is provided with a subchamber in the middle of an exhaust passage that is connected to the passage via a communication passage, and a subchamber is provided in the communication passage of the subchamber. It is known that an on-off valve connected to a power source corresponding to the engine speed is opened and closed according to the engine speed.

(Problem to be solved by the invention) However, in such a device, the on-off valve and the power source are located at separate locations, and the directions of their movements do not match, so the connecting member that connects them is connected by a link mechanism or Because the cable system is used, the shaft ends on the driving and driven sides must be exposed from the crankcase, cylinder, exhaust passage, etc., and therefore, like a two-wheeled vehicle, the usage conditions are such that mud and stones may fly in the air. In severe cases, it is necessary to take measures such as providing a cover to protect the exposed portion, which has the disadvantage of making the entire structure, including the oil seal, complicated.

(Means for Solving the Problems) The present invention aims to improve such disadvantages, and includes providing a subchamber in the middle of the exhaust passage of a two-stroke engine that is connected to the exhaust passage via a communication passage. The opening/closing valve provided in the communication path of the subchamber is connected to a power source depending on the engine speed, and is opened and closed according to the engine speed.2
In an exhaust system for a cycle engine, a subchamber of the exhaust passage is provided in close proximity to the connection between the passage and the exhaust port, and the power source is provided in the crankcase in conjunction with the crankshaft, and the power source and the opening/closing The rotation shaft of the valve is connected to the engine cylinder, the exhaust passage, and the crankcase through a connecting member that is inserted into and supported by the outer wall portions of the engine cylinder, the exhaust passage, and the crankcase, and an adjuster is provided on the connecting member, and the adjuster is incorporated between the crankcase and a cover that covers the case.

(Embodiment) To explain this with reference to the illustrated embodiment, reference numeral 1 denotes an engine, and an exhaust passage 4 connected to an exhaust port 3 of a cylinder 2 of the engine 1 is provided with a subchamber 6 connected to it via a communication passage 5. An on-off valve 7 is provided in the communication path 5 of the subchamber 6. The rotating shaft 8 of the on-off valve 7 is connected to the connecting member 35.
The connecting member 35 is provided parallel to the shaft hole of the exhaust passage 4 and penetrates through the outer wall of the exhaust passage 4, and its end is connected to the exhaust port 3. A rotary shaft 8 is provided in the outer wall of the exhaust port 3 so as to be perpendicular to the shaft hole of the exhaust port 3 so as to mesh with an extended shaft rod at one end of the rotary shaft 8 and a pinion 9 formed at the shaft end of the extended shaft rod. Track 10
A second pinion 12 is provided at the other end of the rack 10 and meshes with a second rack 11 formed perpendicularly to the rack 10, and extends through the outer wall of the crankcase 14 to protrude into the case 14. pinion shaft 13
The case 14 has a sector gear 17 at one end that meshes with a third pinion 15 provided at the projecting end of the case 14.
The other end of the lever 16 is connected to a power source 18 that corresponds to the engine rotation speed, and the power source 18 is connected to a drive gear 20 provided on a crankshaft 19. The centrifugal governor device 23 is installed on the pump shaft 22 of the water pump 21 driven by the pump shaft 21, and the device 23 is fitted into a radial elongated hole 24a formed in the boss portion of the driven gear 24 of the pump shaft 22. ball 25
and a pair of swash plates 26, 26 provided on the pump shaft 22 so as to sandwich the ball 25.The other end of the swing lever 16 is connected to one of the swash plates 26 via a release 27, and the connection The lever 16 of the member 35 is brought into contact with an adjuster 36 so that its swinging position can be adjusted from the outside, and the adjuster 36 is brought into contact with the lever 1
A pin 28 protruding from one end of the 6, a retainer 31 that is urged by a spring 30 to come into contact with the pin 28, and an adjustment screw 29 provided on the crankcase 14 to adjust the elastic force of the retainer 31. and is adjusted by its adjusting screw 29. In the figure, 32 is an impeller of the water pump 20, 33 is a mechanical seal thereof, and 34 is a pump cover.

(Function) Next, the operation will be explained. The pinion shaft 13 connected to the power source 18 corresponding to the engine speed via the swing lever 16 moves the second rack 11 and meshes with the second rack 11 and the rack 10 at one end. The on-off valve 7 opens and closes the communication passage 5 by rotating the rotating shaft 8.

(Effects of the invention) As described above, according to the invention, the subchamber 6 provided in the exhaust passage 4 of a two-stroke engine
Since this is provided close to the connection between the passage 4 and the exhaust port 3, the gas temperature in the chamber 6 does not drop and the function of the chamber 6 is ensured. A power source 18 for opening and closing the on-off valve 7 is provided in the crankcase 14 in conjunction with the crankshaft, and the power source 18 and the rotating shaft 8 are connected to the outer walls of the engine cylinder 2, the exhaust passage 4, and the crankcase 14. Since the connection is made through the connection member 35 that is inserted into the crankcase and supported, the connection member 35 is provided without being exposed outside the crankcase, and the connection member 35 is durable without being damaged by mud, flying stones, etc. Furthermore, since the connecting member 35 is provided with an adjuster 36 and is built in between the crankcase 14 and the cover 37 covering the case 14, the connecting member 35 provided inside each outer wall can be adjusted. In addition, the connection member 35 and the adjuster 36 are provided without being dispersed in the crankcase 14, so that the primary compression ratio in the case 14 does not decrease, which would lead to a decrease in the output of the two-stroke engine. It has the effect of

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway side view, and FIG. 2 is a side view of FIG. 1A.
3 is a sectional view taken along line B-B in FIG. 1. 1...Engine, 2...Cylinder, 4...Exhaust passage, 5...Communication passage, 6...Subchamber, 7
... Opening/closing valve, 8 ... Rotating shaft, 14 ... Crank case, 18 ... Power source, 35 ... Connection member, 36
...Adjustor.

Claims (1)

[Scope of utility model registration request] A subchamber is provided in the middle of an exhaust passage of a two-stroke engine, and the subchamber is connected to the exhaust passage via a communication passage.
In an exhaust system for a two-stroke engine, the opening/closing valve provided in the communication passage of the subchamber is connected to a power source corresponding to the engine rotational speed to open and close according to the engine rotational speed, and the subchamber of the exhaust passage is connected to the passageway. The power source is provided in the crankcase in conjunction with the crankshaft, and the power source and the rotating shaft of the on-off valve are connected to the engine cylinder, the exhaust passage, and the crankcase. The connection is made through a connection member that is inserted into and supported in each of the outer wall portions of the
An exhaust system for a two-stroke engine, characterized in that the connecting member is provided with an adjuster, and the adjuster is built in between the crankcase and a cover that covers the case.