Parallel double-cylinder motorcycle engine cylinder head

Abstract

The utility model relates to the technical field of motorcycle engines, and discloses a parallel double-cylinder motorcycle engine cylinder head which comprises a combustion chamber, two spark plug holes, a left cylinder, a chain cavity, an air inlet channel, an exhaust channel and eight support pillar holes, the support pillar holes are distributed in a whole upper cavity, the left cylinder and the chain cavity are oppositely arranged on two sides of the cylinder head, and the left cylinder and the chain cavity are communicated with the combustion chamber. Cylinder head mounting bolt through holes are formed in the outer wall of the left cylinder and the outer wall of the chain cavity, and the outer walls of the two spark plug holes and the outer walls of the eight ejector column holes are connected into a whole through first crossed plate type reinforcing ribs. The engine is compact in structure, good in performance and high in reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle engines, in particular to a cylinder head of a parallel double-cylinder motorcycle engine. Background Art

[0002] The demand for high-quality motorcycles with strong power reserve, high speed, stable power output, good exhaust sound, etc. is increasing. The key to high-quality motorcycles lies in the upgrading and transformation of motorcycle engines. In order to obtain high-quality motorcycle engines, single-cylinder motorcycle engines are generally changed to parallel twin-cylinder motorcycle engines to improve the performance and quality of the engine.

[0003] Chinese patent document CN205422964U discloses a twin-cylinder engine cylinder head, which is provided with two special-shaped combustion chambers, and water inlet cavities are arranged around the combustion chambers. Each combustion chamber is provided with two intake valve seat rings, two exhaust valve seat rings and a spark plug hole, and the spark plug hole is located in the middle of the center line connecting the corresponding end faces of the intake valve seat ring and the exhaust valve seat ring. Water channels are arranged around the spark plug hole and above the combustion chamber. The intake valve seat ring and the two exhaust valve seat rings are located around the spark plug hole, and the combustion chamber is surrounded by a water inlet cavity. A chain cavity is provided in the cylinder head, and oil grooves are provided at the corresponding cams between the chain cavity and the two camshaft mounting seats, and the two oil grooves are respectively connected to two oil circuits arranged in the cylinder head. The cylinder head is provided with bolt holes and is connected to the cylinder body by AB bolts.

[0004] The prior art has the following shortcomings: Although the parallel twin-cylinder engine increases the displacement of the engine and the speed of the engine, it also leads to a significant increase in the volume of the engine cylinder head. The installation space of existing motorcycle engines is limited, and it is difficult to install a larger parallel twin-cylinder engine. There are higher requirements for the performance of motorcycle engines, which makes it difficult to meet the requirements for upgrading and transforming existing motorcycles. How to make the parallel twin-cylinder engine have higher reliability and compact structure has become a technical problem that needs to be solved urgently. Utility Model Content

[0005] In order to solve the technical problems of poor reliability and non-compact structure of a parallel twin-cylinder engine, the utility model provides a cylinder head of a parallel twin-cylinder motorcycle engine, comprising a combustion chamber, two spark plug holes, a left cylinder, a chain cavity, an intake passage, an exhaust passage and eight ejector holes, wherein the ejector holes are distributed in the entire upper cavity, the left cylinder and the chain cavity are arranged on both sides of the cylinder head oppositely, the outer wall of the left cylinder and the outer wall of the chain cavity are both provided with cylinder head mounting bolt through holes, and the outer walls of the two spark plug holes and the outer walls of the ejector holes are connected as a whole through a cross plate-type reinforcing rib.

[0006] In order to increase the reliability of the engine cylinder head, the cross-plate reinforcement rib 1 is distributed around the two spark plug holes and the eight top column holes, the cross-plate reinforcement rib 1 is distributed in the entire upper cavity, and the middle part of the cross-plate reinforcement rib 1 is cross-shaped.

[0007] Preferably, the outer wall of the left cylinder is provided with a second plate-type reinforcement rib.

[0008] In order to improve the performance of the engine, the combustion chamber adopts a tent-shaped combustion chamber, which includes four combustion chamber edges and four combustion chamber squeezing areas, and the four combustion chamber edges are simultaneously retracted toward the spark plug hole.

[0009] In order to facilitate the airflow guidance, a nose bridge area is set between two adjacent combustion chamber edges and two adjacent combustion chamber squeezing areas, the intake duct is connected to two intake valve seat ring holes, and the exhaust duct is connected to two exhaust valve seat ring holes. The two intake valve seat ring holes and the exhaust valve seat ring holes are cross-symmetrical, and the nose bridge area is located on the symmetry line. The nose bridge area is a structure that is high in the middle and low at both ends. The part of the nose bridge area close to the symmetry line protrudes in a direction away from the cross-type plate reinforcement rib, and the closer the part of the nose bridge area is to the intake valve seat ring hole and the exhaust valve seat ring hole, the closer it is to the cross-type plate reinforcement rib.

[0010] In order to increase the air intake volume of the air intake duct, the included angle between the inlet and outlet of the air intake duct is 41°~68°.

[0011] In order to cool the cylinder head faster, a water channel is arranged around the exhaust channel. The water channel passes through the water channel through hole between the two exhaust valve seat ring holes, and then passes through the surrounding area of ​​the spark plug hole and the surrounding area of ​​the intake channel. The water channel connects the water pipe connecting hole and the thermostat hole.

[0012] Preferably, the air inlet passage and the exhaust passage are each in two groups, and the water passages are distributed in the two groups of structures respectively.

[0013] The utility model has the following beneficial effects:

[0014] The present application reduces the volume of the engine cylinder head by arranging part of the through holes of the cylinder head mounting bolts on the outside of the chain cavity and the outside of the left cylinder, which is convenient for the arrangement of plate-type reinforcement ribs and water channels, and then uses the cross-type plate-type reinforcement ribs 1 to connect the hole walls of all spark plug holes, and the plate-type reinforcement ribs 2 that surround all the top column holes and are distributed on the entire upper cavity and the outer wall of the left cylinder to increase the reliability of the cylinder head; the diving air channel and the combustion chamber periphery are retracted inward and the combustion chamber has an arc transition with a high middle and low ends in the nose bridge area, so that the air intake of the air channel is increased and it is beneficial to fully mix the fuel and air in the cylinder, thereby improving the performance of the engine; water channels are arranged around the exhaust channel and the spark plug hole and the water channel through holes are arranged between the two exhaust valve seat ring holes, so as to increase the area of ​​cooling water flowing through the exhaust channel and the area of ​​cooling the exhaust channel, thereby taking away more heat and cooling the cylinder head faster; while ensuring that the engine volume and structure remain basically unchanged, the engine can meet the existing motorcycle space installation requirements, performance improvement requirements, and high reliability requirements for parallel twin-cylinder engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of an embodiment of a parallel twin-cylinder motorcycle engine cylinder head of the utility model;

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of the combustion chamber;

[0017] Figure 3 for Figure 2 Rotated cross-section view of the center air intake;

[0018] Figure 4 for Figure 1 Schematic diagram of the structure of the intermediate waterway. DETAILED DESCRIPTION

[0019] The following is further described in detail through specific implementation methods:

[0020] 1. The reference numerals in the drawings of the specification include: combustion chamber 1, spark plug hole 2, left cylinder 3, chain cavity 4, intake duct 5, inlet 501, outlet 502, exhaust duct 6, top column hole 7, upper cavity 8, cylinder head mounting bolt through hole 9, cross plate reinforcement rib 1 10, plate reinforcement rib 2 11, combustion chamber edge 12, combustion chamber squeezing area 13, nose bridge area 14, water channel 16, water channel through hole 17, water pipe connecting hole 18, thermostat hole 19, exhaust valve seat ring hole 20, intake valve 21.

[0021] Example 1

[0022] like Figure 1-4As shown, a parallel twin-cylinder motorcycle engine cylinder head includes a combustion chamber 1, two spark plug holes 2, a left cylinder 3, a chain cavity 4, two intake passages 5, two exhaust passages 6 and eight ejector holes 7, wherein the ejector holes 7 are distributed in the entire upper cavity 8, the left cylinder 3 and the chain cavity 4 are relatively arranged on both sides of the cylinder head, the outer wall of the left cylinder 3 and the outer wall of the chain cavity 4 are both provided with two cylinder head mounting bolt through holes 9, the outer walls of the two spark plug holes 2 and the outer walls of the eight ejector holes 7 are connected as a whole by a cross plate reinforcement rib 10.

[0023] The cross-type plate-type reinforcement rib 10 is distributed around the two spark plug holes 2 and the eight top column holes 7. The cross-type plate-type reinforcement rib 10 is distributed in the entire upper cavity 8. The middle part of the cross-type plate-type reinforcement rib 10 is cross-shaped. The outer wall of the left cylinder 3 is provided with a plate-type reinforcement rib 2 11. The plate-type reinforcement rib 2 11 is located between the two cylinder head mounting bolt holes 9. The cross-type plate-type reinforcement rib 10 and the plate-type reinforcement rib 2 11 have the same structure. The plate-type reinforcement rib 2 11 is only fitted and connected to the outer wall of the left cylinder 3.

[0024] The combustion chamber 1 is a tent-shaped combustion chamber 1 , and the combustion chamber 1 includes four combustion chamber edges 12 and four combustion chamber squeezing areas 13 . The four combustion chamber edges 12 are simultaneously retracted toward the spark plug hole 2 .

[0025] A nose bridge area 14 is set between two adjacent combustion chamber edges 12 and two adjacent combustion chamber squeezing areas 13, the intake duct 5 is connected to two intake valve seat ring holes 21, and the exhaust duct 6 is connected to two exhaust valve seat ring holes 20, the two intake valve seat ring holes 21 and the exhaust valve seat ring holes 20 are cross-symmetrical, the nose bridge area 14 is located on the symmetry line, the nose bridge area 14 is a structure with high middle and low two ends, the part of the nose bridge area 14 close to the symmetry line protrudes away from the cross-type plate-type reinforcement rib 10, the closer the part of the nose bridge area 14 is to the intake valve seat ring hole 21 and the exhaust valve seat ring hole 20, the closer it is to the cross-type plate-type reinforcement rib 10, the nose bridge area 14 is an arc transition with high middle and low two ends, the setting takes into account the streamlines of intake and exhaust, shows the characteristics of high middle and low two ends, and plays a guiding role in airflow.

[0026] The air intake duct 5 adopts a dive-type structure, and the angle between the dotted line of the inlet 501 of the air intake duct 5 and the dotted line of the outlet 502 of the air intake duct 5 is 41°~68°, thereby increasing the air intake amount of the air intake duct 5.

[0027] The intake passage 5 and the exhaust passage 6 are each in two groups, each of the intake passage 5 is connected to two exhaust valve seat ring holes 20, a water channel 16 is arranged around the exhaust passage 6, the water channel 16 passes through a water channel through hole 17 between the two exhaust valve seat ring holes 20, and the water channel 16 then passes through the periphery of the spark plug hole 2 and the periphery of the intake passage 5, the water channel 16 is connected to a water pipe connecting hole 18 and a thermostat hole 19, and the water channel 16 is distributed separately on the two groups of structures.

[0028] The above is only an embodiment of the utility model. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, which will not affect the effect of the implementation of the utility model and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A cylinder head of a parallel twin-cylinder motorcycle engine, comprising a combustion chamber, two spark plug holes, a left cylinder, a chain chamber, an intake duct, an exhaust duct and eight ejector holes, wherein the ejector holes are distributed in the entire upper cavity, characterized in that: The left cylinder and the chain cavity are arranged on both sides of the cylinder head opposite to each other. The outer wall of the left cylinder and the outer wall of the chain cavity are both provided with cylinder head mounting bolt holes. The outer walls of the two spark plug holes and the outer walls of the eight top column holes are connected as a whole through a cross plate reinforcement rib.

2. The parallel twin-cylinder motorcycle engine cylinder head according to claim 1, characterized in that: The cross-plate reinforcing ribs 1 are distributed around the two spark plug holes and the eight top column holes, the cross-plate reinforcing ribs 1 are distributed in the entire upper cavity, and the middle part of the cross-plate reinforcing ribs 1 is cross-shaped.

3. The parallel twin-cylinder motorcycle engine cylinder head according to claim 2, characterized in that: The outer wall of the left cylinder is provided with a second plate-type reinforcing rib.

4. The parallel twin-cylinder motorcycle engine cylinder head according to claim 3, characterized in that: The combustion chamber adopts a tent-shaped combustion chamber, and the combustion chamber includes four combustion chamber edges and four combustion chamber squeezing areas, and the four combustion chamber edges are simultaneously retracted toward the direction of the spark plug hole.

5. The parallel twin-cylinder motorcycle engine cylinder head according to claim 4, characterized in that: A nose bridge area is set between the edges of two adjacent combustion chambers and the squeezing areas of two adjacent combustion chambers, the intake duct is connected to two intake valve seat ring holes, and the exhaust duct is connected to two exhaust valve seat ring holes, the two intake valve seat ring holes and the exhaust valve seat ring holes are cross-symmetrical, and the nose bridge area is located on the symmetry line. The nose bridge area is a structure that is high in the middle and low at both ends. The part of the nose bridge area close to the symmetry line protrudes in a direction away from the cross-type plate-type reinforcement rib, and the closer the part of the nose bridge area is to the intake valve seat ring hole and the exhaust valve seat ring hole, the closer it is to the cross-type plate-type reinforcement rib.

6. The cylinder head of a parallel twin-cylinder motorcycle engine according to any one of claims 1 to 5, characterized in that: The included angle between the inlet and outlet of the air inlet is 41° to 68°.

7. The parallel twin-cylinder motorcycle engine cylinder head according to claim 5, characterized in that: A water channel is arranged around the exhaust channel, the water channel passes through a water channel through hole between two exhaust valve seat ring holes, and then passes through the periphery of the spark plug hole and the periphery of the intake channel, and the water channel is connected to a water pipe connecting hole and a thermostat hole.

8. The parallel twin-cylinder motorcycle engine cylinder head according to claim 7, characterized in that: The air inlet passage and the exhaust passage are each in two groups, and the water passages are distributed on the two groups of structures respectively.

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