WO2004059132A1

WO2004059132A1 - A sealing apparatus of rotary valve-flap type valve mechanism for an internal combustion engine

Info

Publication number: WO2004059132A1
Application number: PCT/CN2003/001051
Authority: WO
Inventors: Zhicheng Hua
Original assignee: Zhicheng Hua
Priority date: 2002-12-13
Filing date: 2003-12-09
Publication date: 2004-07-15
Also published as: CN1508401A; AU2003289642A1

Abstract

A sealing apparatus of rotary valve-flap type valve mechanism for an internal combustion engine is disclosed , wherein a rotary valve-flap is provided between an internal housing and an external housing and a first sealing structure is provided between the rotary valve-flap and the internal housing . Said first sealing structure is that annular concave grooves are provided around an intake port and an exhaust port of the internal housing respectively , a sealing ring is provided in each of the grooves and an elastic member is provided between the sealing ring and the bottom of the groove. The sealing apparatus further includes a second sealing structure for preventing passages from communicating with each other Said second sealing structure is that annular concave grooves are provided around an intake port and an exhaust port at the inside of the external housing respectively, a segmented sealing member is provided in each of the grooves and an elastic member is provided between the sealing member and the external housing. The sealing apparatus according to the invention is good in sealing effect and simple in the structure, and can avoid turbulence of intake air and exhaused gas due to an angle of valve opening overlap to effectively improve operating condition, economic effect and emission of the egine.

Description

Seal structure of rotary valve disc type valve distributing mechanism of internal combustion engine

Technical field

The present invention relates to a fitting of an internal combustion engine, and in particular to a sealing structure for a rotary valve disc type gas distribution mechanism of an internal combustion engine. Background technique

In the conventional four-stroke internal combustion engine gas distribution mechanism, independent valves are used for the intake and exhaust. The reciprocating mechanism is used to open and close the cylinders to ensure that the cylinders can enter or exhaust in a timely manner. Such mechanisms have complex structures, many parts, and parts move during work. Large inertia will cause large impact noise, high power consumption, poor working conditions, and easy to wear parts. Its transmission system is divided into three types, cam lifter, timing chain cam transmission, and gear, cam In the transmission mode, these structures retain the valve, cam, and spring return mechanisms, and their performance is restricted. To this end, the applicant disclosed in Chinese utility model patent CN2422450Y an internal combustion engine gas distribution mechanism, which is provided with an inner cover and an outer cover fixedly cooperating with a cylinder port, and a rotary valve disc and a valve are provided between the inner and outer covers. A valve hole is opened on the plate, and air inlet holes and exhaust holes are opened on the inner and outer covers. The crankshaft mechanism of the internal combustion engine drives the valve plate to rotate through gear transmission, and the valve hole on the valve plate rotates and periodically communicates with the valve hole. The intake and exhaust holes communicate in sequence to realize the intake and exhaust; when the valve hole is turned to the position of the intake hole of the inner and outer cover, the wide hole and the intake hole of the inner and outer cover form an intake passage, and the cylinder intakes air. When the hole is turned to the position of the exhaust hole of the inner and outer cover, the valve hole and the exhaust hole of the inner and outer cover form an exhaust passage, and the cylinder exhausts. When the valve hole is in other positions, the intake and exhaust holes are closed. The internal combustion engine is in the compression or ignition phase.

This structure greatly simplifies the structure by eliminating reciprocating parts, making it more reasonable, and avoiding malfunctions such as piston top valves. At the same time, it reduces the internal consumption of the internal combustion engine and increases the output power. In order to maintain the pressure in the combustion chamber, it is required to achieve a good seal between the rotating valve disc and the lower cover. At the same time, due to the early opening and late closing requirements of the inlet and exhaust valves, the valve hole on the rotating valve disc is more than the inlet and exhaust. The distance between the channels is wide. In this way, just before the exhaust channel is closed, the intake channel 巳 starts to open, that is, there is a valve overlap angle. At this time, as shown in FIG. 3, at the position of the valve overlap angle, the intake channel And the exhaust channel The short-circuit path caused by the thickness of the valve disc will cause disturbances in the intake and exhaust work, which will adversely affect the economy and blowdown. Therefore, only by achieving a better rotary seal and avoiding the disturbance of the intake and exhaust caused by the short-circuit channel, can the advantages of the simple and high efficiency of the rotary valve disc type gas distribution mechanism be brought into play. '' Summary of the Invention

The purpose of the present invention is to provide a sealing structure of a rotary valve disc type valve distributing mechanism of an internal combustion engine, which can provide a good seal between the valve disc and the cover body while maintaining the pressure of the combustion chamber;

A further object of the present invention is to provide a short-circuit-proof channel sealing structure to ensure that no short-circuit channel is formed between the intake channel and the exhaust channel when the valve overlaps the angle.

In order to achieve the above object, the technical solution used in the present invention is: a sealing structure of a rotary valve disc type gas distribution mechanism of an internal combustion engine, the rotary valve disc is located between the inner cover and the outer cover, and is arranged between the rotary valve disc and the inner cover There is a first sealing structure. The first sealing structure is provided with annular grooves around the air inlet hole and the air exhaust hole of the inner cover. The groove has a built-in seal ring. The seal ring is provided between the seal ring and the bottom of the groove. An elastic member; further comprising a second sealing structure with a short-circuit-proof channel, wherein the second sealing structure is provided with annular grooves around the air intake hole and the exhaust hole inside the outer cover, respectively, and the grooves are built into a segmented type An elastic member is provided between the seal covers.

In the above technical solution, the "seal ring" refers to a ring seal made of a suitable closed curve. Its shape is generally consistent with the shape of the channel wall of the air inlet and air outlet. The commonly used shape is a fan-like ring, which can be larger. The airflow rate is greatly increased; the "elastic member" may be a spring, a torsion spring, etc. The elastic member provides elastic force to the seal ring, so that it compresses the rotary valve sheet, thereby achieving the sealing effect; each of the segmented seals The part can move independently, which is affected by the elastic member. When the valve disc moves, the edge of the notch of the valve hole passes through the seal, the seal moves under the action of the elastic member, and the short-circuit path is closed. The elastic member can be provided at the bottom of the groove and the seal. It can also be set between the seal and the wall of the airflow channel, and the direction of the spring force makes the seal press the valve disc.

In the above technical solution, in the second sealing structure, the groove may be a concave structure provided inside the intake and exhaust holes, and an inner wall of the seal is exposed in the intake and exhaust channels.

In another form, in the second sealing structure, the groove is an annular groove provided in parallel with the wall of the inlet and exhaust hole channels, and the seal is embedded in the annular groove.

The segmented seal is a two-stage structure, and the two sections can be opposed in the direction of the intake and exhaust channels. Slip.

In order to ensure that when the valve hole passes the edge of the inlet and exhaust hole, the seal can be smoothly lifted to facilitate the rotation of the valve disc. A wedge structure with a smoothly reduced edge is provided at the intersection of the rotary valve disc and the direction of rotation. One side is located on the outer cover side, and the inclined surface may be an inclined surface or an arc-shaped surface; at the same time, an inclined surface or an arc-shaped surface may be provided at the bottom of the side on which the valve piece moves in the seal in the second sealing structure.

Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art: 1. Since the present invention uses a ring-shaped sealing ring to realize the sealing of the rotating valve disc, the sealing effect is good, the wear is small, the resistance during movement is small, and the structure Simple

2. As the invention adds a segmented seal, the short-circuit path can be closed, the disturbance of intake and exhaust at the valve overlap angle can be avoided, the working condition of the internal combustion engine can be improved, and the economy and the pollution performance can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural view of a rotary valve disc type gas distribution mechanism of an internal combustion engine used in Embodiment 1 of the present invention;

Figure 2 is a bottom view of Figure 1;

Figure 3 is a schematic structural diagram of a valve disc;

Figure 4 is a schematic diagram of the short-circuit path;

Fig. 5 is a schematic diagram of a partial structure when the valve hole is located between the air inlet hole and the air outlet hole in the first embodiment.

Among them: [1], inner cover; [2], outer cover; [3], rotary valve disc; [4], air inlet hole; [5], exhaust hole; [6], valve hole; [7] , Short-circuit channel; [8], seal ring [9], elastic member; [1 0], concave structure; [1 1], seal member; [12], elastic member; [1 3], gear cavity. detailed description

The present invention is further described below with reference to the accompanying drawings and embodiments-Embodiment 1. As shown in FIG. 1, a sealing structure of a rotary valve disc type gas distribution mechanism of an internal combustion engine, the gas distribution mechanism includes an inner cover 1, an outer cover 2 and Rotary valve disc 3, which is located between the inner cover 1 and the outer cover 2. The inner cover 1 and the outer cover 2 are provided with corresponding intake holes 4 and exhaust Hole 5, the rotary valve disc 3 is provided with a wide hole 6, and a first sealing structure is provided between the rotary valve disc 3 and the inner cover 1. As shown in FIG. 4, when the valve hole 6 is turned to the air inlet hole 4 and When the exhaust holes 5 are formed, a short-circuit passage 7 is formed between the intake passage and the exhaust passage, thereby causing disturbances in the intake and exhaust work. Therefore, in this embodiment, the inner and outer sides of the valve disc are targeted. Two types of sealing structures are provided, as shown in FIG. 5, including a first sealing structure and a second sealing structure. The first sealing structure is around the air inlet hole 4 and the air outlet hole 5 of the inner cover 1. There are annular grooves respectively, and a suitable closed curve-shaped sealing ring 8 is built in the groove, and an elastic member 9 is provided between the sealing ring 8 and the bottom of the groove; and a second sealing structure with a short-circuit-proof channel is also provided. The two sealing structures are: around the air inlet hole 4 and the exhaust hole 5 inside the outer cover 2, respectively, a concave structure 10 is provided, and a segmented seal 11 is annularly provided along the concave structure 10 to seal An elastic member 12 is provided between the bottom of the piece 11 and the bottom of the concave structure 10, which may be a spring, wherein the segmented dense Member of a two-stage structure, along the feed between the two, relative sliding direction of the exhaust passage, when the valve passage is closed, two combined into a ring configuration. The valve hole 6 of the rotary valve disc 3 is provided with a beveled or arcuate surface on one side of the outer cover at both ends of the fan-shaped edge to form a wedge-shaped edge, and the seal 1 2 of the second sealing structure is on the side where the valve disc moves into A beveled or curved surface is provided at the bottom.

Claims

Claim

1. A sealing structure of a rotary valve disc type valve distributing mechanism of an internal combustion engine, the rotary valve disc [3] is located between the inner cover [1] and the outer cover [2], and the rotary valve disc [3] and the inner cover [1] A first seal structure is provided therebetween, which is characterized in that: the first seal structure is a ring-shaped groove and a concave groove around the air inlet hole [4] and the air outlet hole [5j] of the inner cover [1]. A seal ring [8] is built in the groove, and an elastic member [9] is provided between the seal ring [8] and the bottom of the groove; and a second seal structure having a short-circuit-proof passage is also provided. 2] There are annular grooves around the air inlet hole [4] and the exhaust hole [5] on the inner side, and the groove has a built-in segmented seal [11], which is arranged between the seal [11] and the outer cover. There are elastic parts [12].

2. The sealing structure of a gas distribution mechanism according to claim 1, characterized in that: in the second sealing structure, the groove may be a concave structure provided inside the intake and exhaust holes [10] The inner wall of the seal [11] is exposed to the intake and exhaust channels.

3. The seal structure of a gas distribution mechanism according to claim 1, wherein in the second seal structure, the groove is an annular groove provided in parallel with the wall of the inlet and exhaust hole channels, and The seal is embedded in the annular groove.

4. The sealing structure of a gas distribution mechanism according to claim 2 or 3, wherein the segmented seal is a two-stage structure, and the two sections can slide relative to each other in the direction of the intake and exhaust channels.

5. The sealing structure of a gas distribution mechanism according to claim 4, characterized in that: a wedge-shaped structure with a smoothly reduced edge is provided at the intersection of the valve hole [6] of the rotary valve disc [3] and the rotation direction, The inclined side is located on the outer cover side, and the inclined surface may be an inclined surface or an arc surface.

6. The sealing structure of a gas distribution mechanism according to claim 5, characterized in that: the sealing member [11] in the second sealing structure is provided with an inclined surface or an arcuate surface at the bottom of one side of the direction in which the valve plate moves in.