CN112228240A

CN112228240A - Motorcycle engine

Info

Publication number: CN112228240A
Application number: CN202011225740.7A
Authority: CN
Inventors: 郭东劭; 张立成; 郑海刚; 颜阳益; 张林江; 蒋来
Original assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Current assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Priority date: 2020-11-05
Filing date: 2020-11-05
Publication date: 2021-01-15

Abstract

The invention provides a motorcycle engine, and belongs to the technical field of motorcycles. It has solved the problem that current motorcycle engine is difficult to compromise water pump stability and valve clearance regulation convenience. The motorcycle engine comprises a cylinder head, wherein the cylinder head is provided with an upper bonding surface matched with a cylinder cover and a lower bonding surface matched with a cylinder body, a cam shaft and an air valve are installed in the cylinder head, the bonding surface is obliquely arranged relative to the lower bonding surface along the length direction of the cam shaft, the higher edge of the upper bonding surface is higher than the cam shaft, a mounting hole which is coaxial with the cam shaft is formed in the side wall of the cylinder head at the higher edge of the upper bonding surface, and the lower edge of the upper bonding surface is lower than the top surface of an air valve rod part when the air valve is in a closed state. This motorcycle engine has compromise water pump stability and valve clearance regulation convenience.

Description

Motorcycle engine

Technical Field

The invention belongs to the technical field of motorcycles, and relates to a motorcycle engine.

Background

The motorcycle engine comprises a cylinder head, a cylinder cover fixed on the top surface of the cylinder head and a cylinder body fixed on the bottom surface of the cylinder head, a combustion chamber is arranged in the cylinder body, a piston is arranged in the combustion chamber, the piston drives a crankshaft in a crankcase below the piston to operate through a connecting rod, an air inlet channel and an air exhaust channel communicated with the top of the combustion chamber are arranged in the cylinder head, air valves are arranged at the air inlet channel and the air exhaust channel, a cam shaft and a rocker shaft are further arranged in the cylinder head, a rocker arm is arranged on the rocker shaft, one end of the rocker arm abuts against a cam on the cam shaft, the other end of the rocker arm abuts against the top of the valve, the rocker arm is driven to. And for the engine needing water cooling, a water pump is also needed to be arranged on the side part of the cylinder head, and a pump shaft of the water pump needs to be coaxially arranged with the camshaft, so that the pump shaft is driven to rotate through the camshaft.

The water pump mounting structure of the internal combustion engine as disclosed in the patent document (200910262442.2) has the semicircular notch surfaces on the cylinder head and the cylinder head cover, when the cylinder head cover is fixed and covered on the cylinder head, the two semicircular notch surfaces are butted to form a mounting hole, the pump shaft of the water pump passes through the mounting hole, and meanwhile, a sealing component needs to be arranged between the pump shaft and the mounting hole for sealing, but because the sealing component is arranged at the combination position of the cylinder head and the cylinder head cover, the roundness of the mounting hole can be affected by the matching degree variation between the cylinder head cover and the cylinder head in the long-term use process, and the sealing of the sealing component on the pump shaft and the mounting hole can be affected by the dismounting and mounting of the cylinder head cover in the later maintenance process.

In order to solve the above problems, patent document (201520866534.2) discloses a water-cooling circulation system of an engine, wherein the periphery of a cylinder head is higher, a cam shaft is completely sunk to the middle part of the cylinder head, a complete mounting hole can be formed on the higher side wall of the cylinder head, the mounting hole and the cam shaft are arranged concentrically, a water pump is arranged on the side part of the cylinder head, a pump shaft of the water pump penetrates through the mounting hole to be connected with the cam shaft, the complete mounting hole on the cylinder head enables the stability of the pump shaft to be better, but the problem that the overhaul difficulty of internal components of the cylinder head is increased also exists, such as valve clearance adjustment and valve clearance arrangement for ensuring the normal work of an engine valve distribution mechanism, because the valve distribution mechanism is in a high-speed state during work and has higher temperature, if a valve rod part extends after being heated, the valve can be automatically pushed open, so that the valve and a valve seat are not closed tightly, when designing valve timing mechanism, leave certain clearance between intake and exhaust valve pole portion top and rocking arm, this clearance is the valve clearance, need adjust the valve clearance in engine assembling process, need insert the valve clearance internal measurement with flat dipperstick when adjusting earlier, and above-mentioned engine is for more stable installation water pump, it is higher to lead to the cylinder head height, the camshaft lower floor, it is lower to lead to the valve clearance position, need put into the cylinder head with the dipperstick during measurement and inserting, the operation degree of difficulty is great, it is convenient inadequately to lead to the valve clearance to adjust.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a motorcycle engine which is used for solving the problem that the stability of a water pump and the convenience of valve clearance adjustment are difficult to be considered at the same time.

The purpose of the invention can be realized by the following technical scheme: a motorcycle engine comprises a cylinder head, wherein the cylinder head is provided with an upper bonding surface matched with a cylinder cover and a lower bonding surface matched with a cylinder body, and a cam shaft and an air valve are installed in the cylinder head.

The cylinder cover is matched with the upper bonding surface of the cylinder head and fixed on the cylinder head, the cylinder body is matched with the lower bonding surface of the cylinder head and fixedly connected with the cylinder head, the cylinder body is arranged approximately horizontally, the lower bonding surface is approximately horizontal, therefore, the upper bonding surface is in an inclined state, the inclined upper bonding surface enables one side of the cylinder head to be higher and the other opposite side to be lower, the side wall of the higher side of the cylinder head is enabled to have enough space for installing a water pump, and a complete installation hole is formed for a pump shaft to pass through, and simultaneously, the concentric arrangement of a pump shaft and a cam shaft of the water pump can be met, so that the cam shaft can drive the water pump to operate, the water pump is installed on the cylinder head by forming the complete installation hole on the side wall of the cylinder head, the pump shaft is matched with the complete installation hole, the installation stability and the sealing performance, consequently when needs adjustment valve clearance, the staff can have outside to in the valve clearance of level insertion valve top from the lower one side of cylinder body with the dipperstick in to measuring valve clearance width and adjusting valve clearance according to measuring result, make valve clearance adjust more convenient, this application sets up through the slope of last faying face promptly, through the higher side-mounting water pump of cylinder head, adjust valve clearance through the lower one side of cylinder head, thereby compromise water pump stability and valve clearance and adjusted the convenience.

In the motorcycle engine, the two valves are respectively positioned at two sides of the camshaft, the upper ends of the two valve rod parts are respectively close to two inclined edges of the upper combining surface, and the position of the inclined edge of the upper combining surface, which is opposite to the adjacent valve rod part, is lower than the top surface of the adjacent valve rod part. The position of valve corresponds with the position of the combustion chamber in the cylinder body, therefore be in the intermediate position of cylinder head high side and low side roughly, but valve slope sets up and makes valve rod portion be close to the slope border position of last faying face more, for this reason will go up the relative position of slope border and adjacent valve rod portion of faying face and be less than the top surface of adjacent valve rod portion, the dipperstick can be directly inserted from the slope border department of last faying face during adjustment valve clearance, reduce male length, thereby make the dipperstick insert the end and change the control more easily, further improve the convenience of valve clearance adjustment.

In the motorcycle engine, the cylinder head is further provided with a rocker arm, one end of the rocker arm can abut against a cam of the camshaft, the other end of the rocker arm is in threaded connection with an adjusting bolt, the lower end of the adjusting bolt is opposite to the top end of the valve rod, when the valve is in a closed state and the rocker arm abuts against the cam of the camshaft, a valve gap is formed between the lower end face of the adjusting bolt and the top face of the valve rod, the width of the valve gap is gradually increased from one end to the other end, and the end with the larger width of the valve gap faces an inclined edge of the upper joint face adjacent to the valve. The one end of valve clearance is great, and the other end is less, and the great one end orientation of valve clearance width is along the slope border of faying face for the dipperstick can insert the great one end of valve clearance width from slope border top, changes in inserting, further improves the convenience that valve clearance adjusted.

In the motorcycle engine described above, the height of the higher edge of the upper joint surface is greater than the height of the cam shaft when the lobe portion faces upward. The higher side of the cylinder head has enough height for forming the mounting hole, and the cylinder head can penetrate through the mounting hole when being mounted with the camshaft, so that the camshaft is convenient to mount.

In the motorcycle engine, the cylinder head is provided with a chain cavity therein, the higher edge of the upper joint surface is positioned at one side of the cylinder head where the chain cavity is positioned, the camshaft is also fixed with a chain wheel which is positioned in the chain cavity, and the higher edge of the upper joint surface is lower than the top of the chain wheel. The top of the chain wheel is higher than the higher side of the cylinder head, so that the chain is convenient to mount.

In the motorcycle engine, an included angle between the upper joint surface and the lower joint surface is an acute angle. Although the upper joint surface is obliquely arranged, the inclination is not large, so that the upper joint surface plays a certain supporting role on the cylinder cover, and the stability of the whole structure is ensured.

In the motorcycle engine, the cylinder head is further provided with two rocker shaft holes, rocker shafts are fixedly arranged in the two rocker shaft holes in a penetrating manner, the two rocker shafts are arranged in parallel with the cam shaft, the two rocker arms are respectively sleeved on the two rocker shafts in a rotating manner, and the lower edge of the upper joint surface is lower than the two rocker shaft holes. When the rocker shaft is installed, the rocker shaft can be inserted into the rocker shaft hole from the lower side of the cylinder head, and the assembly is convenient.

In the motorcycle engine, the cylinder head is provided with a plurality of fixing parts on the side wall of the side where the higher edge of the upper combining surface is located, and the water pump is fixedly arranged on the fixing parts. So that the water pump remains stable.

Compared with the prior art, the motorcycle engine has the following advantages:

1. because the higher one side lateral wall of jar head has sufficient space to set up complete mounting hole and is used for the pump shaft to pass, can satisfy simultaneously that mounting hole and camshaft set up with one heart, the camshaft of being convenient for drives the water pump operation, and through set up complete mounting hole on the jar head lateral wall for the water pump is installed on the jar head, and the pump shaft cooperates with complete mounting hole, guarantees mounting hole department installation stability and leakproofness, and then guarantees the stability of water pump.

2. Because the lower border of last faying face is less than the top surface of valve rod portion, consequently when needs adjustment valve clearance, the staff can have outside to interior level to insert in the valve clearance of valve top with the dipperstick from the lower one side of cylinder body to measure valve clearance width and adjust valve clearance according to measuring result, make valve clearance adjust more convenient.

3. Because the relative position of the slope border of last faying face and adjacent valve pole portion is less than the top surface of adjacent valve pole portion, the dipperstick can be directly inserted from the slope border department of last faying face when adjusting valve clearance, reduces male length to make the dipperstick insert the end and change the control, further improve the convenience of valve clearance adjustment.

Drawings

Fig. 1 is a partial perspective view of a motorcycle engine.

Fig. 2 is a partial plan view of the motorcycle engine.

Fig. 3 is a partial structural rear view of the motorcycle engine.

Fig. 4 is an enlarged view of a structure at a in fig. 1.

Fig. 5 is a sectional view of the structure at B-B in fig. 2.

Fig. 6 is an enlarged view of the structure at C in fig. 5.

In the figure, 1, a cylinder head; 11. an upper bonding surface; 12. a lower bonding surface; 13. a chain cavity; 14. a camshaft bore; 15. a rocker shaft hole; 16. an air intake passage; 17. an exhaust passage; 18. mounting holes; 19. a fixed part; 2. a camshaft; 21. a cam; 22. a sprocket; 3. an air valve; 4. a rocker shaft; 5. a water pump; 6. a rocker arm; 61. adjusting the bolt; 62. a roller; 7. valve lash.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2 and 3, a motorcycle engine comprises a cylinder head 1, wherein the top surface of the cylinder head 1 is an upper joint surface 11 for being fixedly connected with a cylinder cover in a matching way, the bottom surface of the cylinder head 1 is a lower joint surface 12 for being fixedly connected with a cylinder body in a matching way, a camshaft hole 14 and two rocker shaft holes 15 are arranged in the cylinder head 1, the two rocker shaft holes 15 are respectively positioned at two sides of the camshaft hole 14 and are arranged in parallel, a camshaft 2 penetrates through the camshaft hole 14, a rocker shaft 4 penetrates through the rocker shaft hole 15, the upper joint surface 11 is obliquely arranged relative to the lower joint surface 12 along the length direction of the camshaft 2, an included angle between the upper joint surface 11 and the lower joint surface 12 is an acute angle, so that the upper joint surface 11 has a higher edge, a lower edge and two oblique edges, a mounting hole 18 is arranged on one side wall with the higher edge of the cylinder head 1, and the mounting hole 18, the side wall of the cylinder head 1 is also provided with a plurality of fixing parts 19 which are arranged around the mounting hole 18 and used for mounting the water pump 5, namely the water pump 5 is fixed on the fixing parts 19 through bolts, a pump shaft of the water pump 5 can penetrate through the mounting hole 18 to be fixedly connected with the camshaft 2, the higher edge of the upper bonding surface 11 is higher than the camshaft 2, and the height of the higher edge of the upper bonding surface 11 is larger than the height of the upward pointed part of the cam 21 on the camshaft 2. Referring to fig. 4, 5 and 6, an intake channel 16 and an exhaust channel 17 are respectively disposed on two sides of two inclined edges of an upper joint surface 11, two valves 3 are further mounted on a cylinder head 1, the two valves 3 control opening and closing of the intake channel 16 and the exhaust channel 17 by sliding up and down, rocker arms 6 are rotatably sleeved on two rocker arm shafts 4, one ends of the rocker arms 6 are connected with rollers 62, the rollers 62 can abut against a cam 21 of a camshaft 2, the other ends of the rocker arms are screwed with adjusting bolts 61, the lower end surface of each adjusting bolt 61 is an arc surface and is opposite to the top end of a rod part of the valve 3, when the valve 3 is in a closed state and the rocker arms 6 abut against the cam 21 of the camshaft 2, a valve gap 7 is formed between the lower end surface of the adjusting bolt 61 and the top surface of the rod part of the valve 3, the lower edge of the upper joint surface 11 is, and the lower edge of the upper combining surface 11 is lower than the two rocker shaft holes 15.

The two valves 3 are respectively positioned at two sides of the camshaft 2, the upper ends of the rod parts of the two valves 3 are respectively close to two inclined edges of the upper combining surface 11, and the position, opposite to the rod part of the adjacent valve 3, of the inclined edge of the upper combining surface 11 is lower than the top surface of the rod part of the adjacent valve 3. The upper ends of the two adjusting bolts 61 and the upper ends of the two valve 3 rod parts are inclined outwards, and the inclination of the adjusting bolts 61 is smaller than that of the valve 3 rod parts, so that the width of the valve clearance 7 is gradually increased from one end to the other end, and the inclined edge of the upper joint surface 11 adjacent to the valve 3 is formed by the larger width end of the valve clearance 7. The cylinder head 1 is internally provided with a chain cavity 13, the higher edge of the upper joint surface 11 is positioned at one side of the cylinder head 1 where the chain cavity 13 is positioned, the camshaft 2 is also fixedly provided with a chain wheel 22, the chain wheel 22 is positioned in the chain cavity 13, and the higher edge of the upper joint surface 11 is lower than the top of the chain wheel 22.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms cylinder head 1, upper joint surface 11, lower joint surface 12, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. The motorcycle engine comprises a cylinder head (1), wherein the cylinder head (1) is provided with an upper bonding surface (11) matched with a cylinder cover and a lower bonding surface (12) matched with a cylinder body, a cam shaft (2) and an air valve (3) are installed in the cylinder head (1), and the motorcycle engine is characterized in that the bonding surface (11) is obliquely arranged relative to the lower bonding surface (12) along the length direction of the cam shaft (2), the higher edge of the upper bonding surface (11) is higher than the cam shaft (2), an installation hole (18) which is coaxially arranged with the cam shaft (2) is formed in the side wall of one side where the higher edge of the upper bonding surface (11) is located of the cylinder head (1), and the lower edge of the upper bonding surface (11) is lower than the top surface of the rod part of the air valve (3) when the air valve (3.

2. A motorcycle engine as claimed in claim 1, characterized in that said valves (3) are two and located on either side of the camshaft (2), and the upper ends of the stems of the two valves (3) are respectively adjacent to the two inclined edges of the upper junction plane (11), the inclined edge of the upper junction plane (11) being lower than the top surface of the stem of the adjacent valve (3) in a position opposite to the stem of the adjacent valve (3).

3. A motorcycle engine according to claim 2, characterized in that the cylinder head (1) is further provided with a rocker arm (6), one end of the rocker arm (6) can abut against the cam (21) of the camshaft (2), the other end is in threaded connection with an adjusting bolt (61), the lower end of the adjusting bolt (61) is opposite to the top end of the rod part of the valve (3), when the valve (3) is in a closed state and the rocker arm (6) abuts against the cam (21) of the camshaft (2), a valve clearance (7) is formed between the lower end surface of the adjusting bolt (61) and the top surface of the rod part of the valve (3), the width of the valve clearance (7) is gradually increased from one end to the other end, and the end with larger width of the valve clearance (7) faces the inclined edge of the upper joint surface (11) adjacent to the valve (3).

4. A motorcycle engine as claimed in claim 1, 2 or 3, characterised in that the height of the higher edge of the upper junction surface (11) is greater than the height of the cam shaft (2) with the lobe of the cam (21) facing upwards.

5. A motorcycle engine as claimed in claim 4, characterised in that the cylinder head (1) has a chain chamber (13) therein, the higher edge of the upper junction surface (11) is located on the side of the cylinder head (1) where the chain chamber (13) is located, the camshaft (2) is also fixed with a chain wheel (22), the chain wheel (22) is located in the chain chamber (13), and the higher edge of the upper junction surface (11) is lower than the top of the chain wheel (22).

6. A motorcycle engine as claimed in claim 1, 2 or 3, characterised in that the angle between the upper (11) and lower (12) joining surfaces is acute.

7. A motorcycle engine as claimed in claim 3, characterized in that the cylinder head (1) is further provided with two rocker shaft holes (15), rocker shafts (4) are fixedly arranged in the two rocker shaft holes (15) in a penetrating manner, the two rocker shafts (4) are arranged in parallel with the camshaft (2), the two rocker arms (6) are respectively rotatably sleeved on the two rocker shafts (4), and the lower edge of the upper joint surface (11) is lower than the two rocker shaft holes (15).

8. A motorcycle engine as claimed in claim 1, 2 or 3, characterised in that the cylinder head (1) has fixing portions (19) on the side wall of the side where the higher edge of the upper joint surface (11) is located, and the water pump (5) is fixedly mounted on the fixing portions (19).