Motorcycle engine

Abstract

The utility model relates to a motorcycle engine which comprises a cam shaft, a rocker arm, a crankshaft, a piston, an air cylinder, a crankcase and a balance shaft, the cam shaft is installed in a cylinder head cam shaft hole, the rocker arm is installed on a cylinder head rocker arm seat, the air cylinder is installed below a cylinder head, the piston is installed in the air cylinder, and a connecting rod small end of the crankshaft is connected with the piston through a piston pin. The crankshaft is installed in a crankshaft hole of the crankcase, and the balance shaft is installed below the front end of the crankshaft. The engine keeps the original technical characteristics, the rotating speed and the torque of the engine are greatly improved by increasing the displacement, and meanwhile, the balance shaft is adopted for vibration reduction and the roller rocker arm is adopted for efficient transmission, so that the requirements of consumers for high performance, reliability, durability and small vibration are met.

Description

Technical Field

[0001] This utility model belongs to the field of motorcycle technology, specifically relating to a motorcycle engine. Background Technology

[0002] As people's living standards improve, motorcycles have become a tool for leisure and entertainment, gradually developing towards larger displacement and higher performance. Besides power requirements, riding comfort is also an important indicator of high performance. Currently, large-displacement motorcycles mainly use twin-cylinder engines, especially parallel twin-cylinder engines, which are characterized by their compact structure, stability, reliability, and high cost-effectiveness. However, the variety of parallel twin-cylinder engines in China is limited, their displacement is relatively small, and technological innovation lags behind. To expand the market and meet consumer demands, it is imperative to provide a large-displacement, high-performance, reliable, durable, and low-vibration parallel twin-cylinder motorcycle engine. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a large-displacement, high-performance, reliable and durable, low-vibration synchronous parallel twin-cylinder motorcycle engine.

[0004] Technical solution

[0005] This utility model discloses a motorcycle engine, comprising a camshaft, rocker arms, a crankshaft, a piston, a cylinder, a crankcase, and a balance shaft. The camshaft is installed in the camshaft bore of the cylinder head, the rocker arms are installed on the rocker arm seat of the cylinder head, the cylinder is installed below the cylinder head, the piston is installed inside the cylinder, the small end of the connecting rod of the crankshaft is connected to the piston via a piston pin, the crankshaft is installed in the crankshaft bore of the crankcase, and the balance shaft is installed below the front end of the crankshaft. The engine is characterized by: the maximum lift of the intake camshaft being 5.2mm-5.5mm, and the maximum lift of the exhaust camshaft being 4.8mm-5.3mm; the diameter of the rocker arm rollers being 16.8-17.2mm; the single-cylinder diameter of the cylinder being 63.45-63.65mm; the crankshaft consisting of two pairs of symmetrical left and right cranks, and three bearings mounted on the crankshaft; and the balance shaft having two counterweights located between the left and right cranks.

[0006] The motorcycle engine is characterized in that the center distance between the roller and the rocker arm shaft is 17.8-18.2mm.

[0007] The motorcycle engine is characterized in that: the piston stroke of a single cylinder is 58-62mm, the rotation radius of a single crank is 28.5-31.5mm, and the center distance between the large and small end bores of the connecting rod in each cylinder is 100.5-102.5mm.

[0008] The motorcycle engine is characterized in that the center distance between the main shaft and the auxiliary shaft is 48.5-52.5mm.

[0009] The motorcycle engine is characterized in that: the center distance between the crankshaft hole and the main shaft hole of the crankcase is 81.0-85.0 mm, the center distance between the crankshaft hole and the balance shaft hole is 67.0-72.0 mm, and the center distance between the main and auxiliary shaft holes is 48.5-52.5 mm.

[0010] This utility model relates to a motorcycle engine with a displacement of approximately 400cc, consisting of a cylinder, piston, and crankshaft. This displacement engine retains the compact, stable, reliable, and cost-effective technical characteristics of a parallel twin-cylinder engine. Furthermore, by increasing the displacement, the engine's speed and torque are significantly improved. Simultaneously, it employs a balance shaft for vibration reduction and a roller rocker arm for efficient transmission, meeting consumers' demands for high performance, reliability, durability, and low vibration. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a main view of the motorcycle engine described in an embodiment of the present invention.

[0013] Figure 2 This is a schematic diagram of the crankshaft balance shaft of the motorcycle engine described in this embodiment of the utility model.

[0014] Figure 3 This is a schematic diagram of the crankshaft of the motorcycle engine described in this embodiment of the utility model.

[0015] Figure 4 This is a schematic diagram of the crankcase of the motorcycle engine described in this embodiment of the utility model. Detailed Implementation

[0016] The specific structure of this utility model will be further described below with reference to the accompanying drawings.

[0017] Referring to the attached drawings, a motorcycle engine includes a camshaft (1), a rocker arm (2), a crankshaft (3), a piston (4), a cylinder (5), a crankcase (6), and a balance shaft (7). The camshaft (1) is installed in the camshaft hole of the cylinder head, the rocker arm (2) is installed on the rocker arm seat of the cylinder head, the cylinder (5) is installed below the cylinder head, the piston (4) is installed inside the cylinder (5), the small end of the connecting rod of the crankshaft (3) is connected to the piston (4) through a piston pin (41), the crankshaft (3) is installed in the crankshaft hole (61) of the crankcase (6), and the balance shaft (7) is installed below the front end of the crankshaft (3). The maximum lift (11) of the intake cam of the camshaft (1) is 5.2mm-5.5mm, and the maximum lift (12) of the exhaust cam of the camshaft (1) is 4.8mm-5.3mm; the diameter (21) of the rocker arm roller is 16.8-17.2mm; the single cylinder diameter (51) of the cylinder (5) is 63.45-63.65mm; the crankshaft (3) is composed of two pairs of symmetrical left and right cranks, and the crankshaft (3) is equipped with three bearings (31); the balance shaft (7) is provided with two counterweights (71), and the counterweights (71) are located in the middle of the left and right cranks respectively.

[0018] The center distance (22) between the roller and the rocker arm shaft is 17.8-18.2 mm. The piston stroke (52) of a single cylinder is 58-62 mm, the rotation radius of a single crank is 28.5-31.5 mm, and the center distance (31) between the large and small end bores of the connecting rod in each cylinder is 100.5-102.5 mm.

[0019] The center distance between the main shaft and the countershaft is 48.5-52.5 mm; the center distance (63) between the crankshaft hole (61) and the main shaft hole (62) of the crankcase (6) is 81.0-85.0 mm, the center distance (65) between the crankshaft hole (61) and the balance shaft hole (64) is 67.0-72.0 mm, and the center distance (67) between the main shaft hole (62) and the countershaft hole (66) is 48.5-52.5 mm.

[0020] The motorcycle engine, consisting of a cylinder, piston, and crankshaft, has a displacement of approximately 400cc. This displacement engine retains the compact, stable, reliable, and cost-effective characteristics of a parallel twin-cylinder engine. Furthermore, by increasing the displacement, its speed and torque are significantly improved. Simultaneously, it employs a balance shaft for vibration reduction and a roller rocker arm for efficient transmission, meeting consumers' demands for high performance, reliability, durability, and low vibration.

[0021] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the structure of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A motorcycle engine, comprising a camshaft, rocker arm, crankshaft, piston, cylinder, crankcase, and balance shaft, wherein the camshaft is mounted in a camshaft bore in the cylinder head, the rocker arm is mounted on a rocker arm seat in the cylinder head, the cylinder is mounted below the cylinder head, the piston is mounted inside the cylinder, the small end of the connecting rod of the crankshaft is connected to the piston via a piston pin, the crankshaft is mounted in a crankshaft bore in the crankcase, and the balance shaft is mounted below the front end of the crankshaft, characterized in that: The maximum lift of the intake camshaft is 5.2mm-5.5mm, and the maximum lift of the exhaust camshaft is 4.8mm-5.3mm; the diameter of the rocker arm roller is 16.8-17.2mm; the single cylinder diameter is 63.45-63.65mm; the crankshaft consists of two pairs of symmetrical left and right cranks, and the crankshaft is equipped with three bearings; the balance shaft has two counterweights, which are located in the middle of the left and right cranks respectively.

2. The motorcycle engine according to claim 1, characterized in that: The distance between the roller and the center of the rocker arm shaft is 17.8-18.2mm.

3. The motorcycle engine according to claim 1, characterized in that: The piston stroke of a single cylinder is 58-62mm, the rotation radius of a single crank is 28.5-31.5mm, and the center distance between the large and small end bores of the connecting rod in each cylinder is 100.5-102.5mm.

4. The motorcycle engine according to claim 1, characterized in that: The center distance between the main spindle and the secondary spindle is 48.5-52.5mm.

5. The motorcycle engine according to claim 1, characterized in that: The center distance between the crankshaft bore and the main shaft bore of the crankcase is 81.0-85.0 mm, the center distance between the crankshaft bore and the balance shaft bore is 67.0-72.0 mm, and the center distance between the main and auxiliary shaft bores is 48.5-52.5 mm.

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