Double-cylinder general engine

Abstract

The utility model discloses a double-cylinder general engine which comprises a starting motor in transmission fit with a transmission mechanism of the engine. The starting motor comprises a stator, a rotor and an isolator, one end of the rotor is connected with a rotor transmission gear, the isolator is provided with an isolator transmission gear meshed with the rotor transmission gear, the tooth number ratio between the rotor transmission gear and the isolator transmission gear ranges from 8: 35 to 10: 28, the center distance ranges from 23 to 28.8, and the rotor transmission gear is connected with the isolator transmission gear. The modulus of the rotor transmission gear and the modulus of the isolator transmission gear range from 1 to 1.25. According to the scheme, the problem that in the prior art, a double-cylinder general engine is poor in starting stability is solved.

Description

Technical Field

[0001] The utility model relates to a twin-cylinder general-purpose engine. Background Art

[0002] A twin-cylinder general-purpose engine refers to an engine with two cylinders, which is composed of two identical single cylinders arranged on a body and sharing a crankshaft to output power. When starting the twin-cylinder general-purpose engine, a starting motor is needed to provide power for starting. The existing starting motors for twin-cylinder general-purpose engines are generally direct-drive type. Because the direct-drive motor can provide a large torque, it is convenient for the twin-cylinder general-purpose engine to start quickly. However, for the case where the load changes greatly, the adaptability of the direct-drive motor is weak.

[0003] Chinese patent document CN204858868U discloses a starting motor, which is composed of a motor body, an end cover installed on the motor body, and a one-way clutch placed inside the end cover. An input transmission gear for driving its operation is assembled on the one-way clutch. A transmission tooth is provided on the output shaft of the motor body, and the transmission tooth is directly meshed with the input transmission gear. The motor body directly drives the input transmission gear to rotate through the output shaft. The effect of this existing technical solution is that the transmission tooth provided on the output shaft of the motor body is directly meshed with the input transmission gear. Under the condition that the transmission ratio remains unchanged, the transmission structure is simplified, the axial distance between the motor body and the one-way clutch is reduced, and thus the product volume is reduced and materials are saved.

[0004] When the above-mentioned existing starting motor is installed on a twin-cylinder general-purpose engine, it is found that the starting stability of the twin-cylinder general-purpose engine is poor, and the entire starting motor needs to be disassembled during maintenance operations, resulting in cumbersome maintenance operations. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a twin-cylinder general-purpose engine to solve the problem of poor starting stability of the twin-cylinder general-purpose engine in the prior art.

[0006] To achieve the above purpose, the basic scheme of the utility model provides a twin-cylinder general-purpose engine, including a starting motor that is in transmission cooperation with the transmission mechanism of the engine; the starting motor includes a stator, a rotor, and a one-way clutch. One end of the rotor is connected with a rotor transmission gear. The one-way clutch is provided with a one-way clutch transmission gear that meshes with the rotor transmission gear. The tooth number ratio between the rotor transmission gear and the one-way clutch transmission gear is between 8:35 and 10:28, the center distance is between 23 and 28.8, and the module of the rotor transmission gear and the one-way clutch transmission gear is between 1 and 1.25.

[0007] Preferably, the center distance between the rotor drive gear and the one-way clutch drive gear satisfies the relation: a = (z1 + z2) / 2 × m + y × m, where a is the center distance, z1 and z2 are the number of teeth of the two gears respectively, m is the module of the two gears, and y is the center distance variation coefficient.

[0008] Preferably, the power of the starting motor satisfies the relation: P = T × n / 9550, where P is the motor power, T is the starting torque, and n is the motor speed.

[0009] Preferably, a tail cover is detachably connected to one end of the stator away from the rotor drive gear, and the carbon brush assembly of the starting motor is connected to the tail cover.

[0010] The utility model has the following beneficial effects:

[0011] 1. By adopting this solution, the starting of the twin-cylinder universal engine is smooth and stable, and the starting reliability is greatly improved. Moreover, the structure of the starting motor is compact, occupying a small space, which is more convenient for the installation and layout of the twin-cylinder universal engine.

[0012] 2. By providing a detachable tail cover and connecting the carbon brush assembly to the tail cover, the maintenance operation of the starting motor can be completed by removing the tail cover, without disassembling the entire starting motor, which improves the maintenance convenience of the starting motor and also improves the heat dissipation performance of the starting motor. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the starting motor in an embodiment of a twin-cylinder universal engine of the utility model. Detailed Description of the Invention

[0014] The following is a further detailed description through specific embodiments:

[0015] The reference numerals in the drawings of the specification include: tooth cover 1, one-way clutch 2, one-way clutch drive gear 3, rotor drive gear 4, end cover 5, rotor 6, stator 7, carbon brush assembly 8, tail cover 9.

[0016] The embodiment is basically as shown in the attached Figure 1 figures: A twin-cylinder universal engine includes a starting motor that is in transmission cooperation with the transmission mechanism of the engine. In this embodiment, the transmission mechanism of the engine includes a flywheel that is in transmission cooperation with the starting motor, and the starting motor realizes the starting of the engine by driving the flywheel to rotate.

[0017] The starting motor includes a stator 7, a rotor 6 and a one-way clutch. The one-way clutch includes a tooth cover 1. One end of the stator 7 is connected with an end cover 5, and the tooth cover 1 is fixedly connected with the end cover 5. The one-way clutch further includes a one-way clutch 2 and a one-way clutch drive gear 3 arranged inside the tooth cover 1. One end of the rotor 6 is connected with a rotor drive gear 4 meshing with the one-way clutch drive gear 3. The tooth number ratio between the rotor drive gear 4 and the one-way clutch drive gear 3 is between 8:35 and 10:28, such as 8:35, 9:35, 10:35, 8:28, 8:30, 10:28, 10:30, etc. The center distance between the rotor drive gear 4 and the one-way clutch drive gear 3 is between 23 and 28.8. The module of the rotor drive gear 4 and the one-way clutch drive gear 3 is between 1 and 1.25.

[0018] Preferably, the center distance between the rotor drive gear 4 and the one-way clutch drive gear 3 satisfies the relational expression: a = (z1 + z2) / 2 × m + y × m, where a is the center distance, z1 and z2 are the tooth numbers of the two gears respectively, m is the module of the two gears, and y is the center distance variation coefficient. Preferably, the power of the starting motor satisfies the relational expression: P = T × n / 9550, where P is the motor power, T is the starting torque (N·m), and n is the motor speed (r / min).

[0019] Preferably, a tail cover 9 is detachably connected to one end of the stator 7 away from the rotor drive gear 4, and the carbon brush assembly 8 of the starting motor is connected with the tail cover 9. With such a setting, the carbon brush assembly 8 cooperates with the commutator of the starting motor at one end of the stator 7 away from the one-way clutch, so that the maintenance operation of the starting motor (such as replacing the carbon brush, etc.) can be realized only by disassembling the tail cover 9, which improves the maintenance convenience and is also beneficial to the heat dissipation of the starting motor.

[0020] Adopting this solution makes the starting of the twin-cylinder universal engine stable and smooth, and greatly improves the starting reliability. Moreover, the structure of the starting motor is compact, occupies a small space, and is more convenient for the installation and layout of the twin-cylinder universal engine. By setting the detachable tail cover 9 and connecting the carbon brush assembly 8 with the tail cover 9, the maintenance operation of the starting motor can be completed by disassembling the tail cover 9, without disassembling the whole starting motor, which improves the maintenance convenience of the starting motor and also improves the heat dissipation performance of the starting motor.

[0021] The above are only the embodiments of the present invention. Common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent.

Claims

1. A twin-cylinder general-purpose engine, comprising a starting motor drivingly engaged with the transmission mechanism of the engine; the starting motor includes a stator, a rotor and a one-way clutch, one end of the rotor is connected with a rotor transmission gear, and the one-way clutch is provided with a one-way clutch transmission gear meshing with the rotor transmission gear, characterized in that: The tooth number ratio between the rotor drive gear and the one-way clutch drive gear is between 8:35 and 10:28, and the center distance is between 23 and 28.

8. The module of the rotor drive gear and the one-way clutch drive gear is between 1 and 1.

25.

2. A twin-cylinder general-purpose engine according to claim 1, characterized in that: The center distance between the rotor drive gear and the one-way clutch drive gear satisfies the relation: a = (z1 + z2) / 2 × m + y × m, where a is the center distance, z1 and z2 are the tooth numbers of the two gears respectively, m is the module of the two gears, and y is the center distance variation coefficient.

3. A double-cylinder general-purpose engine according to claim 2, characterized in that: The power of the starting motor satisfies the relation: P = T × n / 9550, where P is the motor power, T is the starting torque, and n is the motor speed.

4. A double-cylinder general-purpose engine according to claim 1, 2 or 3, characterized in that: One end of the stator away from the rotor drive gear is detachably connected with an end cover, and the carbon brush assembly of the starting motor is connected with the end cover.

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