TW201410960A - Secondary air import device of an engine - Google Patents

Abstract

A secondary air import device of an engine includes a cylinder, a cylinder head, a cylinder head cover, a one-way valve, a one-way valve cap, an air duct, and an engine cover. The cylinder has a one-way valve seat. The cylinder head is fixed on the cylinder and has an exhaust pass. The cylinder head cover is fixed on the cylinder head and the one-way valve is arranged on the one-way valve seat. The one-way valve cap is fixed on the one-way valve and has a joint. The air duct is arranged in the cylinder and, at its two ends, communicated with the one-way valve and the exhaust pass. The engine cover is fixed on the cylinder and has an opening, whereas the joint of the one-way valve cap is extended outside the engine cover. Therefore, the space of the engine is fully utilized and the number of components is reduced. In addition, the engine cover can suppress the noise of the one-way valve.

Description

Secondary air introduction device for engine

The invention relates to a secondary air introduction device for an engine, in particular to a secondary air introduction device suitable for a locomotive engine.

Due to rising awareness of environmental protection, many related regulations have emerged, requiring vehicles (such as locomotives) to improve engine combustion efficiency or reduce exhaust emissions. In order to solve the environmental problems and reduce the pollution of the air, there is a secondary air introduction device on the engine of the locomotive. The secondary air introduction device is connected to the exhaust device of the engine when the engine burns and exhausts the exhaust gas. Before the exhaust gas is discharged, fresh air (so-called secondary air) is introduced to make the exhaust gas re-burn, so that the pollutants in the exhaust gas can be burned and converted, and the oxidation can be fully performed to purify the exhaust gas. In order to reduce the purpose of air pollution.

The conventional engine secondary air introduction device, such as the Republic of China patent certificate number: I301524, is equipped with a one-way valve, and uses the vent of the central cover of the locomotive to cool the one-way valve to prevent the check valve from being damaged by high temperature. . However, the secondary air introduction device described above is limited to a large cooling effect only when the vehicle is running or has a cooling air entering, so that the cooling effect is unstable. Moreover, the one-way valve plate is often in an open and closed state. When opening and closing, the valve of the one-way valve will generate noise due to the knocking, and the noise is easily transmitted through the ventilating opening of the central cover of the locomotive, which is not ideal.

In addition, the conventional technology, such as the Republic of China patent certificate number: M345129, its locomotive exhaust gas purification device is set on the cylinder head cover, protruding from the engine, is not conducive to the miniaturization of the engine, is not very ideal, there is room for improvement .

Inventors for this reason, in the spirit of active invention, consider a secondary air introduction device that can solve the above problems, and finally complete the present invention after several research experiments.

SUMMARY OF THE INVENTION The main object of the present invention is to provide a secondary air introduction device for an engine, which is provided on a cylinder and located in a hood, so that the engine is miniaturized and the number of parts is reduced, and noise emission can be suppressed.

Another object of the present invention is to provide a secondary air introduction device for an engine, which can ensure the cooling effect of the one-way valve and prevent the one-way valve from being damaged by high temperature.

To achieve the above object, the secondary air introduction device of the engine of the present invention comprises: a cylinder, a cylinder head, a cylinder head cover, a check valve, a check valve cover, an air passage, and an engine cover. Wherein, the cylinder has a one-way valve seat; the cylinder head is fixed on the cylinder, and the cylinder head has an exhaust passage; the cylinder head cover is disposed on the cylinder head; the one-way valve is disposed on the one-way valve seat of the cylinder; The valve cover is disposed on the one-way valve, and the one-way valve cover has a joint for introducing air; the air passage is disposed on the cylinder, the air passage has a first end and a discharge end communicating with the one-way valve The second end of the road is connected; the hood cover is disposed on the cylinder, and the hood has an opening. The opening allows the one-way bonnet joint to extend beyond the hood cover, allowing air to enter the joint and into the one-way valve.

The air passage may be recessed on the top surface of the cylinder or may be recessed on the bottom surface of the cylinder head, and the air passage may be formed by clamping the cylinder and the cylinder head.

The second end of the air passage can communicate with the exhaust passage of the cylinder head through a through hole, and the through hole penetrates and communicates with the exhaust passage of the cylinder head and the bottom surface of the cylinder head to form an air passage. That is, air can be introduced into the exhaust passage through air passages and through holes.

One side of the cylinder may be further provided with a cooling fan, and the one-way valve seat may be disposed adjacent to the cooling fan. Thereby, the cooling airflow blown from the cooling fan can cool the check valve and the air passage, and can avoid the one-way valve being damaged by high temperature.

The one-way valve cover and the one-way valve seat can be locked together with the one-way valve seat by a plurality of locks, screws, or other equivalent structural members, and the one-way valve cover can be accommodated and fixed. To the valve.

The one-way valve may be a reed valve or a check valve of other equivalent structure, and the cylinder and the air passage may be integrally formed. That is, the mold can be integrally formed.

Please refer to FIG. 1 and FIG. 2 , which are respectively a perspective view and a partially exploded view of an engine according to a preferred embodiment of the present invention. The main components of the engine 1 of this embodiment include: a cylinder 10, a cylinder head 20, a cylinder head cover 25, and a check valve. a cover 35, a cooling fan 50, a fan cover 51, a flywheel 52, two engine covers 60, 62, a starter motor 66, a left crankcase 70, a right crankcase 75, a left crankcase cover 71, and A right crankcase cover 76.

As shown in the figure, after the left crankcase 70, the right crankcase 75, the left crankcase cover 71, and the right crankcase cover 76 are removed, it can be clearly disclosed that the cooling fan 50 and the flywheel 52 are coaxially pivoted, and the fan cover 51 is covered again. The two engine covers 62, 60 are respectively disposed on the left and right sides of the cylinder 10, and the engine cover 60 can be an air hood of the cooling fan 50 to guide the cooling airflow. In addition, the cylinder head 20 is fixed on the cylinder 10, and the cylinder head 20 is covered on the cylinder head 20. The two engine covers 62, 60 and the cylinder head cover 25 form a sealed space for the cylinder 10 and the cylinder head 20, respectively. It has a protective effect.

Please refer to FIG. 3 and FIG. 4 respectively, which are exploded view and perspective view of a cylinder and a cylinder head according to a preferred embodiment of the present invention, and please refer to FIG. 2 together. The main components of the secondary air introduction device of the present embodiment include: a cylinder 10, a cylinder head 20, a cylinder head cover 25, a check valve 30, a check valve cover 35, an air passage 40, a plurality of locks 55, and an engine. Cover 60.

The cylinder 10 is provided with a one-way valve seat 12; the cylinder head 20 has an exhaust passage 22; the cylinder head cover 25 is disposed on the cylinder head 20; and the check valve 30 is disposed on the one-way valve seat 12 of the cylinder 10; The one-way valve cover 35 is disposed on the one-way valve 30. The one-way valve cover 35 has a joint 36 for introducing air, and the air passage 40 is disposed on the top surface 101 of the cylinder 10. In addition, the one-way valve cover 35 and the one-way valve seat 12 are locked by a three-locking valve 55, and the one-way valve 30 is received and fixed therein. In the present embodiment, the lock 55 is referred to as a bolt.

As shown in FIG. 3, the air passage 40 includes a first end 41 and a second end 42. The first end 41 of the air passage 40 communicates with the check valve 30, and the second end 42 of the air passage 40 borrows. A through hole 45 communicates with the exhaust passage 22.

As shown in FIG. 4, the through hole 45 is bored and communicates with the exhaust passage 22 of the cylinder head 20 and the bottom surface 201 of the cylinder head 20. In addition, the air passage 40 surrounds the cooling fan side of the cylinder 10 to the lower side of the exhaust passage 22 of the cylinder head 20. That is, air can enter through the joint 36 of the one-way valve cover 35 and be introduced into the exhaust passage 22 via the check valve 30, the air passage 40, and the through hole 45.

In the present embodiment, the check valve 30 is a reed valve, and the cylinder 10 and the air passage 40 are integrally formed by a mold. The air passage 40 is a recess and is recessed on the top surface 101 of the cylinder 10 and is sandwiched by the cylinder 10 and the cylinder head 20.

As shown in FIG. 2, the one-way valve seat 12 is disposed adjacent to the cooling fan 50. Thereby, the cooling airflow blown from the cooling fan 50 can cool the check valve 30 and the air passage 40, and can prevent the check valve 30 from being damaged by high temperature.

The hood cover 60 is attached to the cylinder 10, and the hood cover 60 has an opening 61 for the joint 36 of the one-way valve cover 35 to extend beyond the hood cover 60 to allow air to enter the check valve. The joint 36 of the cover 35, and thus the check valve 30.

Please refer to FIG. 5 and FIG. 6 respectively, which are respectively a top view and a side view of a cylinder according to a preferred embodiment of the present invention, and please refer to FIG. 4 together. In the cylinder 10 of the present embodiment, the air passage 40 is formed in one mold by the mold and the cylinder 10. Air can enter through the joint 36 of the one-way valve cover 35, and then through the air passage 40 The one end 41, the second end 42, and the through hole 45 that flows to the cylinder head 20 are introduced into the exhaust passage 22.

Accordingly, in the present embodiment, not only the check valve 30 can be disposed on the cylinder 10, but also the check valve 30 is located in the hood cover 60, which can reduce the size of the engine 1 and reduce the number of parts, and can suppress noise emission. Moreover, the cooling effect of the check valve 30 can be ensured, and the check valve 30 can be prevented from being damaged by high temperature.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of the claims is intended to be limited to the above embodiments.

1‧‧‧ engine

10‧‧‧ cylinder

101‧‧‧ top surface

12‧‧‧ one-way seat

20‧‧‧ cylinder head

201‧‧‧ bottom

22‧‧‧Exhaust Road

25‧‧‧Cylinder head cover

30‧‧‧ check valve

35‧‧‧ check valve cover

36‧‧‧Connectors

40‧‧‧Air passage

41‧‧‧ first end

42‧‧‧second end

45‧‧‧through hole

50‧‧‧Cooling fan

51‧‧‧fan cover

52‧‧‧Flywheel

55‧‧‧Locker

60‧‧‧ engine cover

61‧‧‧ openings

62‧‧‧Engine cover

66‧‧‧Starting motor

70‧‧‧ Left crankcase

71‧‧‧ Left crankcase cover

75‧‧‧Right crankcase

76‧‧‧Right crankcase cover

1 is a perspective view showing the appearance of an engine according to a preferred embodiment of the present invention.

2 is an exploded partial view of the engine of a preferred embodiment of the present invention.

Figure 3 is an exploded view of a cylinder and cylinder head in accordance with a preferred embodiment of the present invention.

4 is a perspective view of a cylinder and cylinder head in accordance with a preferred embodiment of the present invention.

Figure 5 is a top plan view of a cylinder in accordance with a preferred embodiment of the present invention.

Figure 6 is a side elevational view of a cylinder in accordance with a preferred embodiment of the present invention.

10‧‧‧ cylinder

101‧‧‧ top surface

12‧‧‧ one-way seat

20‧‧‧ cylinder head

30‧‧‧ check valve

35‧‧‧ check valve cover

36‧‧‧Connectors

40‧‧‧Air passage

41‧‧‧ first end

42‧‧‧second end

55‧‧‧Locker

Claims (7)

A secondary air introduction device for an engine includes: a cylinder including a one-way valve seat; a cylinder head fixed to the cylinder and including an exhaust passage; a cylinder head cover disposed on the cylinder head; a one-way valve is disposed on the one-way valve seat; a one-way valve cover is disposed on the one-way valve and has a joint for introducing air; an air passage is disposed on the cylinder, including one a first end communicating with the one-way valve and a second end communicating with the exhaust passage; and an engine cover covering the cylinder, the engine cover having an opening for the joint Extend the hood cover. The secondary air introduction device of the engine of claim 1, wherein the air passage is recessed on a top surface of the cylinder and is sandwiched by the cylinder and the cylinder head. The secondary air introduction device of the engine of claim 1, wherein the second end of the air passage communicates with the exhaust passage through a through hole, and the through hole penetrates the exhaust passage With the bottom surface of the cylinder head. The secondary air introducing device of the engine of claim 1, wherein one side of the cylinder is further provided with a cooling fan, and the one-way valve seat is disposed adjacent to the cooling fan. The secondary air introducing device of the engine of claim 1, wherein the one-way valve cover and the one-way valve seat are locked by a plurality of locks. The secondary air introduction device for an engine according to claim 1, wherein the check valve is a reed valve. The secondary air introduction device for an engine according to claim 1, wherein the cylinder and the air passage are integrally formed.