CN220815841U

CN220815841U - Cylinder cover air inlet channel

Info

Publication number: CN220815841U
Application number: CN202322505175.5U
Authority: CN
Inventors: 罗招; 谯晗; 阎兴堂
Original assignee: Seres Group Co Ltd
Current assignee: Seres Group Co Ltd
Priority date: 2023-09-14
Filing date: 2023-09-14
Publication date: 2024-04-19
Anticipated expiration: 2033-09-14

Abstract

The utility model discloses a cylinder cover air inlet channel, which comprises a main air inlet channel and two branch air inlet channels formed at the tail end of the main air inlet channel, wherein the tail ends of the two branch air inlet channels are respectively provided with an air channel throat and connected with a corresponding valve seat ring, and a valve guide pipe is arranged above the two branch air inlet channels close to the air channel throat; the split air inlet channel is provided with a split air inlet channel upper molded surface and a split air inlet channel lower molded surface, the split air inlet channel lower molded surface protrudes downwards in an arc shape towards one side close to the combustion chamber, the tail end of the split air inlet channel upper molded surface is provided with a first diversion surface protruding inwards in an arc shape, and the first diversion surface is smoothly connected to the upper surface of the air channel throat; this cylinder cap intake duct can guarantee that the intake duct has higher tumble ratio, simultaneously through being formed with the first water conservancy diversion face of inwards arc arch at the end of dividing the upper profile of intake duct, accelerates and water conservancy diversion to the intake immediately before entering the laryngeal, can improve the air inlet flow coefficient and improve tumble intensity, and then guarantee to have the reduction that flow coefficient can not be too much when higher tumble ratio.

Description

Cylinder cover air inlet channel

Technical Field

The utility model belongs to the technical field of structural design of parts of gasoline engines, and particularly relates to a cylinder cover air inlet channel.

Background

With the increasing global environmental pollution, the related emission regulations and the fuel consumption regulations of automobiles are becoming stricter. The degree of mixing of oil and gas in the gasoline engine cylinder and the combustion quality directly influence the emission and the oil consumption. The reduction of fuel consumption requires the improvement of combustion speed, which requires the high movement intensity of the mixture in the cylinder, and the cylinder head air inlet is a key component for improving the movement intensity in the cylinder, so that the development of a higher tumble ratio air inlet is necessary. At present, most air inlet channel structures are straight barrel structures, and the flow direction of air flow is changed by designing a fish belly structure on the lower side surface of the tail end of an air inlet channel or adjusting the position structure of a throat opening along the lower part of the air channel so as to improve the tumble ratio. Therefore, how to increase the intake air flow coefficient as much as possible on the premise of keeping high tumble intensity is a technical problem to be solved in cylinder head intake duct development.

Disclosure of utility model

In view of the above, the present utility model aims to provide a cylinder head air inlet structure with a high tumble ratio and capable of meeting the requirement of the air intake quantity in a cylinder, and solve the problems of high tumble ratio and low flow coefficient in the existing cylinder head air inlet design process.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the cylinder cover air inlet channel comprises a main air inlet channel and two branch air inlet channels formed at the tail end of the main air inlet channel in a branching way, wherein the tail ends of the two branch air inlet channels are respectively provided with an air channel throat and connected to a corresponding valve seat ring, and a valve guide pipe is arranged above the two branch air inlet channels close to the air channel throat; the gas inlet and outlet pipe is characterized in that the gas inlet and outlet pipe is provided with a gas inlet and outlet pipe upper molded surface and a gas inlet and outlet pipe lower molded surface, the gas inlet and outlet pipe lower molded surface faces towards one side of the combustion chamber and is downwards and arcuately protruded, the tail end of the gas inlet and outlet pipe upper molded surface is provided with a first diversion surface inwards arcuately protruded, and the first diversion surface is smoothly connected to the upper surface of the gas inlet and outlet pipe.

Further, the branch air inlet passage and the main air inlet passage are of an integrated structure, and a second diversion surface which is contracted inwards relative to the upper surface of the main air inlet passage is arranged on the upper part of the upper molded surface of the branch air inlet passage.

Further, the value range of the obtuse angle gamma formed between the first diversion surface and the two tangent lines of the starting point and the end point of the intersection line formed by the transverse section of the central line of the excessive air inlet channel is 140-160 degrees.

Further, the side face of the valve seat ring is inclined upwards and inwards relative to the bottom face of the valve seat ring and is arranged in a truncated cone shape, and the value range of an included angle alpha between a bus of the side face of the valve seat ring and the normal line of the bottom face of the valve seat ring is 26-30 degrees.

Further, on the transverse section passing through the center line of the air inlet channel, the included angle theta between the upper contour intersection line of the air channel throat opening and the top surface of the valve seat ring is 40-50 degrees.

Further, the tail end of the lower molded surface of the split air inlet channel is in arc transition connection with the lower surface of the air inlet channel throat, and the value range of the included angle beta between the tangent line at the tail end point of the arc intersection line formed by the lower molded surface of the split air inlet channel and the transverse section of the center line of the split air inlet channel and the bottom surface of the valve seat ring of the exhaust valve is 6-10 degrees.

Further, the included angle eta between the central line of the branch air inlet channel and the bottom surface of the cylinder cover is 25-35 degrees.

Further, the valve guide pipe is integrally formed at the first guide surface; and the included angle between the central line of the valve guide pipe and the bottom surface of the cylinder cover is 75-80 degrees.

Compared with the prior art, the utility model has the following beneficial effects:

According to the cylinder cover air inlet channel, the lower molded surface of the split air inlet channel is downwards arranged in an arc-shaped protruding mode towards one side close to the combustion chamber, meanwhile, the air inlet channel is provided with the air channel throat structure at the tail end of the split air inlet channel, so that the air inlet channel can be guaranteed to have a high rolling flow ratio, meanwhile, the first diversion surface protruding inwards in an arc mode is formed at the tail end of the upper molded surface of the split air inlet channel, air inlet just before entering the throat is accelerated and diverted, the air inlet flow coefficient can be improved to a certain extent, the rolling flow intensity is improved, and the fact that the flow coefficient is not excessively reduced when the rolling flow ratio is high is guaranteed; on the other hand, the cross-sectional area of the throat is not reduced to a certain extent, but the flow coefficient is influenced to a certain extent; in addition, the structure of the double-division air inlet channel can also achieve the purposes of increasing the air inflow, improving the fuel combustion effect and improving the fuel economy.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objects and other advantages of the utility model may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.

Drawings

FIG. 1 is an axial schematic view of the whole structure of the present utility model

FIG. 2 is a schematic diagram of the front view of the valve guide of the present utility model with the valve guide removed

FIG. 3 is a schematic diagram of a front view structure of the present utility model

Reference numerals: 1-a main air inlet channel; 2-dividing the air inlet channel; 201-upper profile of the split intake duct; 201 a-a first flow guiding surface; 201 b-a second flow guiding surface; 202-lower profile of the split intake duct; 3-airway laryngeal opening; 4-valve retainer; 5-valve guide tube seat; 6-exhaust valve seat insert.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the illustrations provided in the following embodiments are merely for explaining the basic idea of the present utility model, and the following embodiments and features in the embodiments may be combined with each other without conflict.

Referring to fig. 1, a cylinder head intake duct includes a main intake duct 1 and two branched intake ducts 2 formed at the tail end of the main intake duct, the tail ends of the branched intake ducts 2 are respectively formed with an air duct throat 3 and connected to a corresponding valve seat ring 4, a valve guide 5 is arranged above the branched intake duct 2 near the air duct throat 3, the front end of the main intake duct 1 is formed with an intake duct inlet connected to an intake manifold, and the rear ends of the two valve seat rings 4 form an intake duct outlet, so that the purposes of increasing the intake air amount, improving the fuel combustion effect and improving the fuel economy can be achieved by adopting a structure of the branched intake duct; the split air inlet channel 2 is provided with a split air inlet channel upper molded surface 201 and a split air inlet channel lower molded surface 202, the split air inlet channel lower molded surface 202 protrudes downwards in an arc shape towards one side close to the combustion chamber, the split air inlet channel lower molded surface 202 forms a fish-belly structure, the tumble effect of air inlet is facilitated, and simultaneously, the combination of the air inlet channel throat 3 can ensure a higher tumble ratio of air inlet; the tail end of the upper surface 201 of the branched air inlet channel is provided with a first diversion surface 201a protruding inwards, wherein the inwards protruding inwards refers to a side protruding inwards towards the inner side of the air inlet channel, the first diversion surface 201a is smoothly connected to the upper surface of the air inlet channel throat 3, and a tangent line at a point A at the tail end of the first diversion surface 201a is smoothly and preferably overlapped with an upper contour intersection line 301 of the air inlet channel throat 3; in the structural design, the lower molded surface 202 of the branch air inlet channel is downwards arranged in an arc shape towards one side close to the combustion chamber, and meanwhile, the air inlet channel is provided with the structure of the air channel throat 3 at the tail end of the branch air inlet channel 2, so that the air inlet channel can be ensured to have higher rolling flow ratio, and meanwhile, the first diversion surface 201a which is inwards arc-shaped and protrudes is formed at the tail end of the upper molded surface 201 of the branch air inlet channel is used for accelerating and diversion the air inlet which is about to enter the throat, so that the air inlet flow coefficient can be improved to a certain extent, the rolling flow intensity can be improved, and the flow coefficient can not be excessively reduced while the air inlet channel is ensured to have higher rolling flow ratio; on the other hand, this approach is not simple to increase the tumble ratio by individual fish belly features and reducing the throat area, without reducing the throat cross-sectional area too much to some extent, but affecting the flow coefficient too much.

In this embodiment, the split intake duct 2 and the main intake duct 1 are of an integral structure, the dimensional accuracy of the integral structure is high, and the upper portion of the upper profile 201 of the split intake duct is provided with a second guiding surface 201b that contracts inwards relative to the upper surface of the main intake duct 1, specifically, the tail end of the upper surface of the main intake duct 1 transitions to the top of the upper profile 201 of the intake duct in an arc shape, and similarly, the "inwardly contracting" refers to contracting towards the inner side of the intake duct, that is, pressing down, and the second guiding surface 201b can perform a preliminary acceleration on the intake air entering the split intake duct 2 from the main intake duct 1 relative to the straight cylinder structure, so that the intake air amount can be further improved to a certain extent.

In this embodiment, the value range of the obtuse angle γ formed between the two tangent lines of the start point a and the end point B of the intersection line formed by the transverse section of the center line of the air inlet passage 2 and the first guide surface 201a is 140-160 degrees, where "transverse" refers to the width direction of the cylinder cover, where the distance between the start point a and the end point B is generally controlled between 20-50mm, and controlling γ to 140-160 degrees can ensure that the amount of inward bulge of the first guide surface 201a is not too large to play a larger role in blocking the air flow, and the control of the angle γ in the range has a better accelerating guide effect, so that more air flows from the air passage throat 3 to the exhaust side of the combustion chamber can be guided, and the intensity of the tumble flow is enhanced.

In this embodiment, the side surface of the valve seat ring 4 is inclined upward and inward relative to the bottom surface of the valve seat ring 4 and is arranged in a truncated cone shape, which is beneficial to machining and ensures dimensional accuracy, and the value range of the included angle α between the bus of the side surface of the valve seat ring 4 and the normal line of the bottom surface of the valve seat ring 4 is 26-30 degrees, in the conventional structure, the angle is basically above 45 degrees, and the air flow backflow phenomenon at the area can be reduced to a certain extent by reducing the included angle α, so that the in-cylinder flow coefficient is larger, and the requirement of the in-cylinder air inflow can be met.

In this embodiment, on the transverse section passing through the center line of the air inlet channel 2, the transverse direction refers to the width direction of the cylinder cover, the value range of the included angle θ between the upper contour intersection line 301 of the air channel throat 3 and the top surface of the valve seat ring 4 is 40-50 degrees, and the same can reduce the air flow backflow phenomenon in the area to a certain extent, so that the cylinder flow coefficient is larger, and the requirement of the air inflow in the cylinder can be met.

In this embodiment, the end of the lower split intake duct profile 202 is connected to the lower surface of the air duct throat 3 in an arc-shaped transition manner, and the value range of the included angle β between the tangent line at the end point C of the arc-shaped intersection 202a formed by the lower split intake duct profile 202 and the transverse section of the center line of the split intake duct and the bottom surface of the exhaust valve seat ring 6 is 6-10 degrees; the angle design problem between the lower profile 202 of the split intake duct and the valve seat ring 6 of the exhaust valve is not considered in the traditional intake duct structural design; the included angle beta is controlled within 6-10 degrees, so that the airflow can be better guided to flow to the exhaust side of the combustion chamber, and the tumble strength is enhanced.

In this embodiment, the included angle η between the central line of the split intake duct 2 and the bottom surface of the cylinder cover is 25-35 degrees, and the angle range can avoid the intake air flow from striking the exhaust valve, and fully utilizes the guiding function of the wall surface of the combustion chamber, thereby being beneficial to improving the rolling ratio, the fuel combustion effect and the fuel economy.

In this embodiment, the valve guide 5 is integrally formed at the first guide surface 201a, and the outer contour of the bottom of the specific valve guide 5 is in shape fit with the first guide surface 201a, so that the concave surface of the first guide surface 201a is reasonably utilized, the compactness of the structure is guaranteed, the forming quality is guaranteed, here, the value range of the included angle epsilon between the center line of the valve guide 5 and the bottom surface of the cylinder cover is 75-80 degrees, the angle range is favorable for the adjustment of the intake valve after installation, and the high tumble strengthening effect of the intake duct in the full lift range is guaranteed.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.

Claims

1. The utility model provides a cylinder cap intake duct which characterized in that: the air valve comprises a main air inlet channel (1) and two branch air inlet channels (2) formed at the tail end of the main air inlet channel in a branching way, wherein the tail ends of the two branch air inlet channels (2) are respectively provided with an air channel throat (3) and are connected with corresponding valve seat rings (4), and a valve guide pipe (5) is arranged above the two branch air inlet channels (2) close to the air channel throat (3); the gas-dividing channel (2) is provided with a gas-dividing channel upper molded surface (201) and a gas-dividing channel lower molded surface (202), the gas-dividing channel lower molded surface (202) protrudes downwards towards one side close to the combustion chamber, a first diversion surface (201 a) protruding inwards is formed at the tail end of the gas-dividing channel upper molded surface (201), and the first diversion surface (201 a) is smoothly connected to the upper surface of the gas channel throat (3).

2. The cylinder head inlet as set forth in claim 1, wherein: the split air inlet channel (2) and the main air inlet channel (1) are of an integrated structure, and a second guide surface (201 b) which is contracted inwards relative to the upper surface of the main air inlet channel (1) is arranged at the upper part of the upper molded surface (201) of the split air inlet channel.

3. The cylinder head inlet as set forth in claim 1, wherein: the value range of an obtuse angle (gamma) formed between two tangent lines of a starting point (A) and a finishing point (B) of an intersection line formed by the first diversion surface (201 a) and the transverse section of the center line of the excessive air inlet channel is 140-160 degrees.

4. The cylinder head inlet as set forth in claim 1, wherein: the side face of the valve seat ring (4) is inclined upwards and inwards relative to the bottom face of the valve seat ring (4) and is arranged in a truncated cone shape, and the value range of an included angle (alpha) between a bus of the side face of the valve seat ring (4) and the normal line of the bottom face of the valve seat ring (4) is 26-30 degrees.

5. The cylinder head inlet as set forth in claim 4, wherein: on the transverse section of the central line of the excessive air inlet channel (2), the value range of the included angle (theta) between the upper contour intersection line (301) of the air channel throat (3) and the top surface of the valve seat ring (4) is 40-50 degrees.

6. The cylinder head inlet as set forth in claim 1, wherein: the tail end of the lower split air inlet channel profile (202) is connected to the lower surface of the air inlet channel throat (3) in an arc transitional manner, and the value range of an included angle (beta) between a tangent line at a tail end point (C) of an arc intersection line (202 a) formed by the lower split air inlet channel profile (202) and the transverse section of the center line of the split air inlet channel and the bottom surface of the exhaust valve seat ring (6) is 6-10 degrees.

7. The cylinder head inlet as set forth in claim 1, wherein: the included angle (eta) between the central line of the branch air inlet channel (2) and the bottom surface of the cylinder cover is 25-35 degrees.

8. The cylinder head inlet as set forth in claim 1, wherein: the valve guide pipe (5) is integrally formed at the first guide surface (201 a), and the included angle (epsilon) between the central line of the valve guide pipe (5) and the bottom surface of the cylinder cover is 75-80 degrees.