CN101746474A - motorcycle engine structure - Google Patents

Abstract

An engine structure of a motorcycle, the engine is arranged at the rear of a down pipe part of a frame, and comprises: a crankcase, which is provided with a left crankcase and a right crankcase, wherein the crankcase is internally provided with a crankshaft, a main shaft, an output shaft and an oil pump, and the crankshaft is connected with the piston by a connecting rod; the cylinder body is internally provided with a connecting rod and a piston, and the center of the cylinder body does not pass through the center of the crankshaft; the cylinder head is provided with a cam shaft, a rocker arm, an air inlet port, an air outlet port and a combustion chamber; the cylinder body is deviated towards the rear of the vehicle body, the central line of the deviated cylinder body is positioned between the center of the crankshaft and the center of the main shaft, and the crankshaft rotates clockwise, so that the configuration space of parts in front of the engine can be effectively increased, the lateral friction force generated by the piston during operation is reduced, and the effect of conveniently installing the exhaust pipe is achieved.

Description

motorcycle engine structure

【Technical field】

The invention relates to a motorcycle engine structure, especially to offset the cylinder body of the engine toward the rear of the vehicle body, thereby effectively increasing the space for the parts in front of the engine and reducing the lateral force generated by the piston during operation. At the same time, it achieves an engine structure that facilitates the installation of the exhaust pipe.

【Background technique】

The action of general vehicles, such as motorcycles, all-terrain vehicles, etc., is to mix the fresh air and fuel from the outside into oil and gas, and then input the oil and gas into the engine to burn and explode to generate power, and push the piston to do reciprocating motion. The crankshaft drives the belt speed change mechanism for transmission to achieve the purpose of advancing.

The engine 1 of the vehicle, as shown in FIG. 1 , includes a cylinder head 11 , a cylinder body 12 and a crankcase 13 .

The two sides of the cylinder head 11 are respectively provided with an intake port 111 and an exhaust port 112 , the intake port 111 and the exhaust port 112 communicate with the combustion chamber 113 , and the cylinder head 11 is provided with a camshaft 114 .

The cylinder body 12 is provided with a connecting rod 121 and a piston 122 inside.

The crankcase 13 is provided with a crankshaft 131 inside, and the crankshaft 131 is linked by the connecting rod 121 and the piston 122 .

When the engine 1 is in motion, the air and the fuel are mixed into oil and gas by the carburetor (not shown in the figure), and then the air intake pipe follows the air inlet 111 and is introduced into the combustion chamber 113, and then the ignition member is used to ignite and explode. Power is generated to push the piston 122 to move back and forth, and the crankshaft 131 drives the speed change system to actuate to drive the rear wheels to rotate.

And because this engine 1 is set up in a vertical manner, so the engine 1 of this vehicle will be biased towards the downcomer 2 of the vehicle frame, and then cause the front of the engine 1 to be unable to configure O2 detectors, fuel tanks or water tanks, and due to the The obstruction of the downpipe 2 also easily causes the exhaust pipe 14 to have a defect that is not easy to install.

In view of the aforementioned shortcomings of the existing engine 1, how to develop an engine structure that can effectively increase the space for parts in front of the engine and facilitate the installation of exhaust pipes is an urgent problem to be solved in the relevant industries.

【Content of invention】

The main technical means of the present invention is to provide a kind of motorcycle engine structure, and this engine is to be arranged on the rear of vehicle frame drop tube part, and comprises: a crankcase, is to have a left crankcase and a right crankcase, and the crankshaft A crankshaft, a main shaft, an output shaft and an oil pump are arranged inside the box, and the crankshaft is connected to the piston by a connecting rod; a cylinder body is provided with a connecting rod and a piston inside, and the center of the cylinder body does not pass through the center of the crankshaft; The cylinder head is provided with a camshaft, a rocker arm, intake and exhaust ports and a combustion chamber on the cylinder head; wherein, the cylinder body is offset towards the rear of the vehicle body so that the center line of the cylinder body after the offset is located at the center of the crankshaft and Between the center of the main shaft, and the crankshaft rotates clockwise, which can effectively increase the space for the parts in front of the engine, reduce the lateral friction generated by the piston when it is running, and achieve the effect of convenient installation of the exhaust pipe .

The second technical means of the present invention is to provide a kind of motorcycle engine structure, and this engine is arranged at the rear of vehicle frame drop pipe part, and comprises cylinder head, cylinder body and crankcase, and this cylinder head is provided with a camshaft, and this cylinder There are connecting rods and pistons inside the body. There is a crankshaft inside the crankcase. The crankshaft is connected to the piston by the connecting rod. There is also a main shaft and an output shaft inside the crankcase. The main shaft is driven by the crankshaft. The output The shaft uses the final gear to drive the rear wheel of the motorcycle to rotate, wherein the crankshaft turns clockwise, and an intermediate shaft is provided between the main shaft and the output shaft, and an idler wheel is provided on the intermediate shaft. The wheel can adjust the rotation direction of the output shaft, so that the rear wheel of the motorcycle can rotate forward, so that the motorcycle can achieve the purpose of moving forward.

Another technical means of the present invention is to provide a kind of motorcycle engine structure, and this engine is arranged on the rear of vehicle frame drop tube part, and comprises cylinder head, cylinder body and crankcase, and this cylinder head front is provided with a cylinder head cover A camshaft, a rocker arm, an intake port, an exhaust port, and a combustion chamber are arranged inside the cylinder head; a connecting rod and a piston are arranged inside the cylinder body; a crankshaft, a main shaft, and an output shaft are arranged inside the crankcase And an oil pump, the crankshaft is connected to the piston by the connecting rod, and there is a main shaft and an output shaft in the crankcase, the main shaft is driven by the crankshaft, and the output shaft drives the rear wheel of the motorcycle to rotate by the final gear , wherein the turning of the crankshaft is clockwise, and an intermediate shaft is arranged between the crankshaft and the main shaft, an idler gear is provided on the intermediate shaft, and the intermediate shaft is located below the line connecting the center of the crankshaft and the center of the main shaft, by This can effectively shorten the wheelbase between the crankshaft and the main shaft, so as to achieve the effect of miniaturizing the engine, and can make the rear wheel of the motorcycle rotate forward, so that the motorcycle can achieve the purpose of moving forward.

【Description of drawings】

Fig. 1 is a schematic sectional view of an existing engine.

Fig. 2 is a schematic side view of the motorcycle of the present invention.

Fig. 3 is a schematic cross-sectional view of a motorcycle engine of the present invention.

Fig. 4 is a schematic view of the appearance of the motorcycle engine of the present invention.

Fig. 5 is a schematic cross-sectional view of another direction of the motorcycle engine of the present invention.

Fig. 6 is a schematic top view of the engine cylinder head of the present invention.

Fig. 7 is a configuration diagram of the crankshaft, flywheel and generator of the present invention.

Fig. 8 is a schematic diagram of the cylinder head and the timing gear of the present invention.

Fig. 9 is a three-dimensional schematic view of the timing chain and the tensioner of the present invention.

Fig. 10 is a schematic cross-sectional view of another embodiment of the present invention.

Fig. 11 is a partial cross-sectional view of the right side of the engine in another embodiment of the present invention.

1 engine 11 cylinder head 111 intake port

                                                                                  

                                                                               

                                                                              

                                                              131

14 exhaust pipe

2 drop tubes

3 motorcycles

4 Steering mechanism 41 Steering head pipe 42 Steering handle

                  43 Front shock absorber   44 Front soil removal

5 Frame unit 51 Supervisor 52 Down pipe

                                                                               

55 Cross Bar 551 Engine Hanger

                                                                                 

E power unit

6 engine 60 exhaust pipe 61 cylinder head

      611 Cylinder head cover   612 Camshaft

        612a camshaft center

6121 intake cam 61211 cam bump

6122 exhaust cam 61221 cam bump

6123 timing gear 6124 timing chain

6125 tensioner 6126 guide rod

613 rocker arm

614 intake port 6141 intake valve

615 exhaust port 6151 exhaust valve

616 combustion chamber 617 spark plug

62 cylinder body 621 piston

622 connecting rod 623 cylinder liner

63L crankcase 63L left crankcase

63R right crankcase 631 crankshaft

      631a crankshaft center

                                                                         

633 output shaft 633a output shaft center

634 final gear 635 flywheel

6351 bump 636 pulse sensor

637 drive chain

    638 intermediate shaft     638a intermediate shaft center

                               

639 oil pump

7 fuel tanks

8 driver's seats

9 rear soil removal

F W front wheel RW rear wheel

a Offset front cylinder body center b Offset rear cylinder body centerline

c original camshaft center

【Detailed ways】

In order to make it easier to understand the structure of the present invention and the effect that can be achieved, it is described as follows in conjunction with the drawings:

First, referring to FIG. 2 , the motorcycle 3 of the present invention at least includes a steering mechanism 4 , a frame unit 5 , a power unit 6 , a fuel tank 7 , a driver's seat 8 and the like.

The steering mechanism 4 mainly includes a steering handle 42 above the steering head pipe 41, and a front shock absorber 43 is connected below the steering head pipe 41, and the bottom of the front shock absorber 43 is supported by a front wheel FW. , A front soil removal 44 is provided between the steering head pipe 41 and the front wheel FW.

The vehicle frame unit 5 has a main pipe 51 extending from the upper part of the steering head pipe 41 toward the rear and inclined downwards. In addition, a descending pipe portion 52 extends downwards in the middle of the steering head pipe 41. The main pipe 51 and the descending pipe portion A reinforcing pipe 53 is arranged between 52 .

The descending pipe portion 52 extends left and right and has a pair of inclined bottom pipes 54 extending toward the rear. A seat frame 56 is connected, and the seat frame 56 is towards the rear and extends to the rear of the vehicle body, and the front half of the seat frame 56 is connected to the upper end of the main pipe 51, thereby forming the seat frame 56 rigidity strength.

A power unit E is arranged between the main pipe 51 and the down pipe portion 52, and the seat frame 56 extends from the front end of the driver's seat 8 to the rear of the motorcycle 3 to the rear; The shock absorber 561 is supported by the rear wheel RW. In addition, a rear soil trimmer 9 is provided between the seat frame 56 and the rear wheel RW.

The power unit E, please refer to FIGS. 3 , 4 , and 5 , at least includes an engine 6 and an exhaust pipe 60 .

Engine 6, comprises cylinder head 61, cylinder body 62 and crankcase 63, and this cylinder head 61 front is provided with a cylinder head cover 611, is provided with a camshaft 612, a rocking arm 613, an intake, exhaust in cylinder head 61 inside. Ports 614, 615 and a combustion chamber 616. The camshaft 612 is provided with an intake cam 6121 and an exhaust cam 6122, wherein, please refer to shown in Figure 6 (the arrow indicates the direction of the front of the car), the cam projection 61211 of the intake cam 6121 is viewed from the cylinder head 61 Next, the center 612a of the camshaft 612 is located on the fourth quadrant of the coordinate axis, and the cam projection 61221 of the exhaust cam 6122 is located on the second quadrant of the coordinate axis. , 6122 to touch the rocker arm 613 can drive the air intake valve 6141 and the exhaust valve 6151 of the air intake port 614 and the exhaust port 615 to move. When the rocker arm 613 is implemented, it is implemented with a roller type rocker arm. After entering the combustion chamber 616 from the intake port 615, it is ignited and exploded by the spark plug 617, and the pressure of the expanded gas will generate thrust to push the piston 621 in the cylinder body 62 to reciprocate up and down. The gas valve 6141 is opened to guide the mixed oil gas into the combustion chamber 616 for combustion, and the exhaust gas after combustion is quickly discharged through the exhaust valve 6151 and then discharged into the exhaust pipe 60 through the exhaust port 615 . The piston 621 inside the cylinder body 62 is provided with a connecting rod 622 to connect with the crankshaft 631 in the crankcase 63 .

Please refer to Figs. 8, 9, and 10 again, the camshaft 612 is provided with a timing gear 6123 on the left side, and the timing gear 6123 is sleeved with a timing chain 6124, which is connected with the crankshaft 631, The power generated by the crankshaft 631 can accurately control the position of the piston 621 and the opening time of the intake and exhaust valves 6141 and 6151 via the timing chain 6124 to maintain the normal operation of the engine 6 . As shown in Figure 9 (the arrow I indicates the intake port side, and the arrow O indicates the exhaust port side), wherein the timing chain 6124 is provided with a tensioner 6125 on the exhaust port 615 side of the cylinder head 61, and A guide rod 6126 is provided on the side of the air intake port 614, and the tensioner 6125 can be used to adjust the tightness of the timing chain 6124 to more precisely control the opening time of the intake and exhaust valves 6141 and 6151.

The cylinder body 62, please refer to Fig. 3, has an accommodating space for the piston 621 and the connecting rod 622 to be arranged inside, and a cylinder liner 623 is arranged on the inner wall of the cylinder body 62, by which the cylinder liner 623 can prevent the cylinder body from The inner wall of 62 is subjected to the friction of piston 621 and the impact of connecting rod 622. And as shown in Figure 3, the cylinder body 62 of the present invention is offset towards the rear of the vehicle body, and the cylinder body 62 is offset towards the rear of the vehicle body, and the center line a of the cylinder body 62 before the offset is offset to form an offset The centerline b of the rear cylinder body 62, so that the centerline b of the offset rear cylinder body 62 is located between the center 631a of the crankshaft 631 and the main shaft 632, and the centerline b of the offset rear cylinder body 62 passes through the center of the camshaft 612 612a.

Crankcase 63, please refer to shown in Fig. 3,4,5, is made of a left crankcase 63L and right crankcase 63R, and this crankcase 63 interior is provided with a crankshaft 631, a balance shaft 6311, a main shaft 632, a Output shaft 633, an intermediate shaft 638 and an oil pump 639. The crankshaft 631 is connected to the piston 621 by the connecting rod 622. The balance shaft 6311 is located above the line connecting the center 631a of the crankshaft 631 and the center 632a of the main shaft 632. The intermediate shaft 638 is provided with an idler wheel 6381; Please also refer to shown in Fig. 5, 7, this crankshaft 631 is provided with a flywheel 635, pulse wave sensor 636 on the left crankcase 63L side, and this flywheel 635 is provided with a projection 6351, when When the crankshaft 631 rotates to drive the flywheel 635, the pulse wave sensor 636 senses the bump 6351 on the flywheel 635, so that the pulse wave sensor 636 can output a signal to the controller (for example: capacitor discharge ignition unit, electronic control unit) (the center of the figure is not drawn), the controller can make the igniter (the center of the figure not drawn) to perform precise ignition action; thereby the main shaft 632 can be driven to rotate by the crankshaft 631, and the output shaft 633 can drive the crankshaft The final gear 634 in the box 63 rotates, and the transmission chain 637 on the final gear 634 drives the rear wheel RW to rotate, wherein, the turning of the crankshaft 631 is to rotate clockwise, as shown in Figure 3; As shown, an intermediate shaft 638 is provided between the output shaft 633 and the main shaft 632. The intermediate shaft 638 is located above or below the center 633a of the output shaft 633 and the center 632a of the main shaft 632, thereby effectively shortening the distance between the output shaft 633 and the main shaft 632. In addition, the oil pump 639 is arranged below the connecting line between the center 631a of the crankshaft 631 and the center 638a of the intermediate shaft 638, and is located in the left crankcase 63L.

In the present invention, the cylinder body 62 of the engine 6 is offset toward the rear of the vehicle body. The cylinder body 62 of the present invention is offset toward the rear of the vehicle body, so that the centerline a of the cylinder body 62 before the offset is offset to form an offset. Rear cylinder body 62 center line b, and then make this offset rear cylinder body 62 center line b be between the center 631a of crankshaft 631 and main shaft 632, thereby, can effectively increase engine 6 front parts (such as water tank, radiator, Oxygen sensor... etc.), and can reduce the lateral friction generated by the piston 621 on the cylinder liner 623 during operation, and at the same time achieve the effect of facilitating the installation of the exhaust pipe 60. In addition, after the offset The centerline b of the cylinder body 62 passes through the center 612 a of the camshaft 612 , which further increases the configuration space between the cylinder body 62 and the cylinder head 6 . In addition, as shown in Figure 3, since the turning of the crankshaft 631 is to rotate clockwise, and an intermediate shaft 638 is arranged between the main shaft 632 and the output shaft 633, it can be assisted by the idler 6381 on the intermediate shaft 638, Changing the rotation direction of the final gear 634 on the output shaft 633 allows the rear wheel RW of the motorcycle 3 to rotate forward, so that the motorcycle 3 can move forward.

Please refer to Fig. 10 and shown in 11 again, when the present invention is implemented, the intermediate shaft 638 can also be set between the crankshaft 631 and the main shaft 632, and the intermediate shaft 638 is located at the center 631a of the crankshaft 631 and the center 632a of the main shaft 632. line, so that the wheelbase between the crankshaft 631 and the main shaft 632 can be effectively shortened to achieve the effect of miniaturizing the engine 6, and with the assistance of the idler wheel 6381 on the intermediate shaft 638, the motorcycle can be adjusted 3 The purpose of the rear wheel RW forward rotation.

To sum up, the motorcycle engine structure of the present invention has indeed improved efficiency compared with the experienced users, and obviously has the elements of novelty and progress.

Claims (20)

1. A motorcycle engine structure, the engine is arranged at the rear of the down pipe portion of the vehicle frame, and includes: A crankcase has a left crankcase and a right crankcase, the crankcase is equipped with a crankshaft, a main shaft, an output shaft and an oil pump, the crankshaft is connected to the piston by a connecting rod; A cylinder body with a connecting rod and a piston inside, and the center line of the cylinder body does not pass through the center of the crankshaft after the offset; A cylinder head, on which a camshaft, a rocker arm, intake and exhaust ports and a combustion chamber are arranged; It is characterized in that: the cylinder body is offset towards the rear of the vehicle body, so that the center line of the offset cylinder body is located between the center of the crankshaft and the center of the main shaft, and the turning of the crankshaft is clockwise. 2. The motorcycle engine structure according to claim 1, wherein the crankcase further comprises an intermediate shaft, the intermediate shaft is located between the main shaft and the output shaft, and the intermediate shaft is provided with an idler gear. 3. The motorcycle engine structure according to claim 1, wherein the crankcase further comprises an intermediate shaft, the intermediate shaft is located between the crankshaft and the main shaft, and the intermediate shaft is provided with an idler gear. 4. The motorcycle engine structure according to claim 2, wherein the intermediate shaft is located above or below the line connecting the center of the main shaft and the center of the output shaft. 5. The motorcycle engine structure according to claim 2, wherein the main shaft is located above the line connecting the center of the crankshaft and the center of the intermediate shaft. 6. The motorcycle engine structure according to claim 3, wherein the intermediate shaft is located below the line connecting the center of the crankshaft and the center of the main shaft. 7. The motorcycle engine structure according to claim 1, wherein the crankcase further comprises a balance shaft. 8. The motorcycle engine structure according to claim 7, wherein the balance shaft is located above the line connecting the center of the crankshaft and the center of the main shaft. 9. The motorcycle engine structure according to claim 1, wherein an intake cam and an exhaust cam are arranged on the camshaft. 10. The motorcycle engine structure according to claim 9, characterized in that: the cam projection of the intake cam is located in the fourth quadrant with the cylinder center as the coordinate axis viewed from the cylinder head. 11. The motorcycle engine structure according to claim 9, characterized in that: the cam projection of the exhaust cam is located in the second quadrant with the cylinder center as the coordinate axis viewed from the cylinder head. 12 . The motorcycle engine structure according to claim 1 , wherein the camshaft is provided with a timing gear on the left side, and the timing gear sleeve is provided with a timing chain. 13 . 13. The motorcycle engine structure according to claim 12, wherein the timing chain is provided with a tensioner on the exhaust port side of the cylinder head, and a guide rod is provided on the intake port side. 14. The motorcycle engine structure according to claim 1, wherein a flywheel and a pulse wave sensor are arranged on one side of the crankshaft. 15. The motorcycle engine structure as claimed in claim 14, wherein a protrusion is provided on the flywheel, and the protrusion is arranged in front of the pulse wave sensor towards the front of the vehicle. 16. The motorcycle engine structure as claimed in claim 14, wherein the flywheel is arranged on the left crankcase. 17. The motorcycle engine structure according to claim 1, wherein the oil pump is arranged below the line connecting the center of the crankshaft and the center of the intermediate shaft. 18. The motorcycle engine structure according to claim 1, wherein the rocker arm is a roller rocker arm. 19. The motorcycle engine structure according to claim 1, wherein a cylinder head cover is arranged on the cylinder head. 20. The motorcycle engine structure according to claim 1, wherein the center of the cylinder body passes through the center of the camshaft.

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