An electric starter

Abstract

The utility model belongs to the internal combustion engine starter technical field, concretely relates to a kind of electric starter.The utility model provides a kind of electric starter, to solve the problem of the large noise of starter in prior art in the working process and without overload protection function.A kind of electric starter, including shell, the shell is rotationally connected with starting wheel, the starting wheel is provided with the gear tooth;The shell is also provided with the drive component of the drive gear tooth, and the drive component includes motor, and the motor drives the gear tooth by belt drive mechanism.In the utility model, motor drives gear tooth by belt drive mechanism, and power is transmitted by flexible contact between belt and pulley in belt drive, which completely eliminates the impact noise generated by direct collision of metal tooth surface in gear transmission.Belt itself has elasticity, can absorb the slight vibration when motor rotates, avoid vibration amplification and transmission to shell through rigid transmission chain, reduce noise from sound source.

Description

Technical Field

[0001] This utility model belongs to the technical field of internal combustion engine starters, specifically relating to an electric starter. Background Technology

[0002] The starter is a device that enables an internal combustion engine to transition from a standstill to self-starting. An internal combustion engine cannot start on its own; it must rely on external force to rotate the crankshaft until the crankshaft reaches the speed required for the internal combustion engine cylinders to ignite. Only then can the internal combustion engine maintain stable operation by generating its own power.

[0003] Existing starters include an electric motor and a starter wheel. The starter wheel has teeth that mesh with the starting components on the internal combustion engine. Rotation of the starter wheel drives the crankshaft of the internal combustion engine, thus starting the engine. The electric motor drives the starter wheel via a gear transmission mechanism. The starter wheel has a driven gear, and the output shaft of the electric motor has a driving gear. The driving gear meshes with the driven gear to drive the starter wheel. The use of a gear transmission mechanism in existing technology results in significant noise during starter operation. Furthermore, the gear transmission mechanism lacks overload protection, making the starter prone to damage. Utility Model Content

[0004] This utility model provides an electric starter, which aims to solve the problems of high noise and lack of overload protection function in the operation of existing starters.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] An electric starter includes a housing, on which a starter wheel is rotatably connected, and the starter wheel is provided with teeth;

[0007] The housing is also provided with a drive assembly for driving the paddle teeth. The drive assembly includes a motor, which drives the paddle teeth through a belt drive mechanism.

[0008] A further improved solution: The belt drive mechanism includes a driving pulley rotatably connected to the housing, a driven pulley disposed on the starting pulley, and a drive belt wound around the driving pulley and the driven pulley.

[0009] Based on the above technical solution: the transmission belt transmits torque through friction with the contact surfaces of the driving and driven pulleys, avoiding the rigid collision of metal tooth surfaces in gear transmission, resulting in smoother power transmission. The elasticity of the transmission belt can absorb minor vibrations during motor rotation (such as vibrations caused by rotor imbalance or bearing clearance), preventing vibrations from being amplified and transmitted to the housing through a rigid transmission chain.

[0010] A further improvement: the transmission belt is a synchronous belt.

[0011] Based on the above technical solutions: Synchronous belts adopt a toothed meshing design, with precise matching between the tooth grooves and pulley teeth (such as HTD-type circular arc teeth), completely eliminating the elastic slippage problem of traditional flat belts. The transmission ratio error is <0.5%, ensuring strict synchronization between the starter pulley and the motor speed, avoiding starting failures or equipment damage caused by speed fluctuations. For example, in engine starting scenarios, the synchronous belt can accurately transmit the motor speed to the starter pulley, achieving smooth ignition. The synchronous belt substrate uses a high-strength glass fiber or steel wire rope reinforcement layer, with a tensile strength of 200-500MPa, capable of withstanding instantaneous overloads several times the rated torque. When the load exceeds a set threshold, the toothed meshing will preferentially cause localized tooth surface wear or tooth skipping, rather than gear breakage due to rigid meshing, forming a "soft protection" mechanism. Actual tests show that its overload capacity is more than three times that of flat belts. Synchronous belt drives produce no metal-on-metal collision noise, and the operating noise is 12-15dB lower than gear drives. The optimized tooth profile design reduces the meshing impact frequency, shifting the noise peak from 5000Hz in gear drives to below 2000Hz, where the human ear is less sensitive. Simultaneously, the damping properties of the rubber substrate absorb over 30% of the vibration energy, reducing the housing vibration acceleration amplitude from 5.2m / s² in gear drives. 2 Reduced to 3.5 m / s 2 It runs more smoothly.

[0012] A further improvement: the transmission belt is a flat belt; or, the transmission belt is a V-belt.

[0013] Based on the above technical solutions: flat belts have a relatively simple structure, are easy to manufacture and install, and have lower costs. Using flat belt drives allows for rapid setup of a transmission system without the need for complex debugging. During transmission, the larger contact area between the belt and pulleys provides a smoother transmission effect, reducing vibration and noise. The wedge effect of V-belts allows for the transmission of greater power under the same tension and pulley size. Compared to flat belt drives, V-belt drives can typically transmit 2-3 times more power. During V-belt drives, elastic slippage is relatively small, ensuring a more accurate transmission ratio.

[0014] A further improved solution: the starting wheel is rotatably connected to the housing via a rotating shaft, and the driven pulley is disposed on the rotating shaft.

[0015] Based on the above technical solution: Since both the starting wheel and the driven pulley are fixed on the same shaft, according to the basic principle of rigid body rotation, all points on the same rigid body have the same angular velocity. Therefore, the rotation of the starting wheel directly drives the shaft to rotate, and the rotation of the shaft causes the driven pulley mounted on it to rotate synchronously, thus realizing the transmission of power from the starting wheel to the driven pulley. This design ensures the directness and efficiency of power transmission. Because the power does not need to go through complex intermediate conversion links, energy loss during transmission is reduced, allowing the driven pulley to obtain relatively stable and sufficient power.

[0016] A further improved solution: the shift teeth and the starter wheel are an integral structure, and there are four shift teeth, which are evenly distributed on the starter wheel along the circumference.

[0017] Based on the above technical solution: the integrated structure makes the shift teeth and the starter wheel an inseparable whole. When the starter wheel is driven to rotate, the shift teeth rotate synchronously with it. This design ensures the continuity and stability of power transmission. The integrated structure avoids problems such as loosening or falling off between the shift teeth and the starter wheel, reducing power loss and interference during transmission. At the same time, the four evenly distributed shift teeth ensure more uniform power transmission, avoiding unstable movement caused by uneven tooth distribution.

[0018] A further improved solution: The motor includes a body and an output shaft rotatably mounted on the body, and the drive pulley is mounted on the output shaft of the motor.

[0019] Based on the above technical solution: when the motor output shaft rotates, it can directly drive the drive pulley mounted on it to rotate synchronously, efficiently and directly transmitting the rotational power generated by the motor to the drive pulley. This reduces intermediate power conversion links, lowers energy loss, and allows the drive pulley to obtain stable and sufficient power, thereby driving the driven components connected by belts to operate, ensuring smooth and efficient power transmission throughout the entire transmission system. The drive pulley is directly mounted on the motor output shaft, eliminating the need for a complex additional transmission mechanism to connect the motor and the drive pulley, saving space and making the entire device structure more compact.

[0020] A further improved solution: The motor is mounted on the housing via a bracket.

[0021] Based on the above technical solution: the bracket, as the connecting component between the motor and the housing, provides stable support for the motor. It typically possesses a certain strength and rigidity to withstand various forces generated by the motor during operation, such as its own weight, vibration forces during operation, and potential external impacts. When the motor is fixed to the bracket, and the bracket is then connected to the housing, the entire structure forms a stable mechanical system. This effectively reduces motor swaying and displacement during operation, ensuring that the motor remains in a stable working state.

[0022] A further improved solution: The housing is provided with a support column to support the bracket, the housing and the support column are an integral structure, the motor is fixed to the bracket by screws, the support column is provided with a screw hole that mates with the screw, the bracket is provided with a through hole through which the screw passes, and the screw passes through the through hole and mates with the screw hole.

[0023] Based on the above technical solution: the integrated shell and support column make the support column an ​​inseparable part of the shell, with no connecting gaps between them, significantly improving overall strength. The support column provides stable support for the bracket, which is then tightly connected to the support column with screws, forming a stable mechanical whole. After the motor is fixed to the bracket, the entire structure can withstand various forces generated by the motor's operation, such as the motor's own weight and vibration impacts during operation. This stable structure ensures stable motor operation, preventing motor displacement or component loosening due to vibration, guaranteeing long-term reliable equipment operation, and reducing failures and maintenance costs caused by structural loosening. It also improves the accuracy and convenience of motor installation.

[0024] A further improved solution: The bracket is provided with a sleeve that increases the contact area between the screw and the bracket. The sleeve and the bracket are an integral structure, and the sleeve communicates with the through hole.

[0025] Based on the above technical solution, the integrated structure of the sleeve and bracket eliminates any assembly gaps between them, allowing them to be tightly integrated into a stable whole. When the screw passes through the sleeve, the increased contact area leads to a corresponding increase in friction between the screw and the bracket. This increased contact area enhances the effective frictional surface, effectively resisting any loosening tendency of the screw under stress. This design, with its increased contact area, ensures that the screw will not easily loosen during long-term operation, guaranteeing a secure connection between the motor and the bracket. The integrated sleeve also distributes the force transmitted from the screw more evenly. When the screw is subjected to tensile or shear forces, the sleeve can transmit these forces more widely to the bracket, avoiding localized stress concentration. Because the sleeve and bracket are integrated, the force transmission path is more direct and efficient, enabling the bracket to withstand greater loads.

[0026] The beneficial effects of this utility model are as follows:

[0027] In this invention, the motor drives the gears via a belt drive mechanism. The belt drive transmits power through the flexible contact between the belt and the pulley, completely eliminating the impact noise generated by the direct collision of metal teeth in gear transmission. The belt itself is elastic, which can absorb the minute vibrations when the motor rotates, preventing the vibrations from being amplified and transmitted to the housing through the rigid transmission chain, thus reducing noise at the source.

[0028] When the load torque exceeds the frictional torque between the belt and the pulley, the belt slips relative to the pulley contact surface, cutting off the power transmission path and forming physical isolation protection. By adjusting the belt preload, the slippage torque threshold can be set to ensure that the motor can still operate safely when starting within the range of 150%-200% of the rated torque. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For users of ordinary skills in the art, other related drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of an electric starter according to the present invention.

[0031] Figure 2 This is a schematic diagram of the first direction of an electric starter of this utility model after omitting the housing.

[0032] Figure 3 This is a schematic diagram of the second direction of an electric starter of this utility model after omitting the housing.

[0033] Explanation of the labels in the diagram:

[0034] 1-Housing; 2-Starter wheel; 3-Pulley; 4-Motor; 5-Drive pulley; 6-Driven pulley; 7-Transmission belt; 8-Shaft; 9-Output shaft; 10-Bracket. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model. All other embodiments obtained by users of the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0036] refer to Figures 1 to 3An electric starter includes a housing 1, a starter wheel 2 rotatably connected to the housing 1, and a pawl 3 provided on the starter wheel 2;

[0037] The housing 1 is also provided with a drive assembly for driving the paddle 3. The drive assembly includes a motor 4, which drives the paddle 3 through a belt drive mechanism.

[0038] Specifically: the belt drive mechanism includes a driving pulley 5 rotatably connected to the housing 1, a driven pulley 6 disposed on the starting pulley 2, and a transmission belt 7 wound around the driving pulley 5 and the driven pulley 6. The transmission belt 7 is a synchronous belt. The transmission belt 7 is a flat belt; or, the transmission belt 7 is a V-belt. The diameter of the driving pulley 5 can be greater than or equal to the diameter of the driven pulley 6.

[0039] The starting wheel 2 is rotatably connected to the housing 1 via a rotating shaft 8, and the driven pulley 6 is mounted on the rotating shaft 8. The gear teeth 3 are integral with the starting wheel 2, and there are four gear teeth 3 evenly distributed along the circumference of the starting wheel 2. The starting wheel 2 can be mounted on the rotating shaft 8 via a key connection.

[0040] Specifically: The motor 4 includes a body and an output shaft 9 rotatably mounted on the body. The drive pulley 5 is mounted on the output shaft 9 of the motor 4. The motor 4 is mounted on the housing 1 via a bracket 10. The housing 1 has a support column supporting the bracket 10, and the housing 1 and the support column are an integral structure. The motor 4 is fixed to the bracket 10 with screws. The support column has a screw hole that mates with the screw, and the bracket 10 has a through hole through which the screw passes, mates with the screw hole. The outer casing of the motor 4 also has a hole through which the screw passes. The bracket 10 has a sleeve that increases the contact area between the screw and the bracket 10. The sleeve and the bracket 10 are an integral structure, and the sleeve communicates with the through hole. Ribs may be provided between the sleeve and the bracket 10.

[0041] Specifically, a winding wheel can be installed on the rotating shaft 8. The winding wheel is connected to the rotating shaft 8 by a key. When a flexible wire is wound on the winding wheel, the flexible wire is used for manual start-up. During manual start-up, the flexible wire is pulled manually, and the flexible wire drives the starting wheel 2 to rotate through the rotating shaft 8, thus achieving manual start-up.

[0042] The working principle of this embodiment:

[0043] After motor 4 starts, its output shaft 9 drives the drive pulley 5 to rotate (the speed is usually 3000-5000 rpm). The drive pulley 5 drives the belt to move through friction. The belt transmits the motion to the driven pulley 6, which is coaxially and fixedly connected to the starting pulley 2. A synchronous belt design (toothed belt) is used here to ensure that the transmission ratio is exactly 1:1, avoiding the slippage problem of ordinary flat belts.

[0044] The gear 3 on starter wheel 2 meshes with the flywheel ring gear of the internal combustion engine, driving the crankshaft to rotate. When the crankshaft speed reaches the ignition speed of the internal combustion engine (approximately 150-200 rpm for gasoline engines and 80-120 rpm for diesel engines), the internal combustion engine enters a self-sustaining operation state. If the internal combustion engine fails to start due to a malfunction, and the crankshaft resistance torque exceeds the frictional torque generated by the belt preload, the belt will slip on the pulley. At this time, motor 4 will idle but will not be damaged. It can be restarted after the fault is cleared.

[0045] This utility model is not limited to the above-mentioned optional embodiments. Under the premise of non-contradiction, the various solutions can be combined arbitrarily. Anyone can derive other forms of products under the guidance of this utility model. However, no matter what changes are made in their shape or structure, all technical solutions that fall within the scope of the claims of this utility model are within the protection scope of this utility model.

Claims

1. An electric starter, characterized in that: Includes a housing, on which a starter wheel is rotatably connected, and the starter wheel is provided with teeth; The housing is also provided with a drive assembly for driving the paddle teeth. The drive assembly includes a motor, which drives the paddle teeth through a belt drive mechanism.

2. The electric starter according to claim 1, characterized in that: The belt drive mechanism includes a driving pulley rotatably connected to the housing, a driven pulley on the starting pulley, and a drive belt wound around the driving pulley and the driven pulley.

3. An electric starter according to claim 2, characterized in that: The transmission belt is a synchronous belt.

4. An electric starter according to claim 2, characterized in that: The transmission belt is a flat belt; or, the transmission belt is a V-belt.

5. An electric starter according to claim 2, characterized in that: The starting wheel is rotatably connected to the housing via a rotating shaft, and the driven pulley is disposed on the rotating shaft.

6. An electric starter according to claim 1, characterized in that: The gear teeth and the starter wheel are an integral structure. There are four gear teeth, which are evenly distributed on the starter wheel along its circumference.

7. An electric starter according to claim 2, characterized in that: The motor includes a body and an output shaft rotatably mounted on the body, and the drive pulley is mounted on the output shaft of the motor.

8. An electric starter according to claim 7, characterized in that: The motor is mounted on the housing via a bracket.

9. An electric starter according to claim 8, characterized in that: The housing is provided with a support column to support the bracket. The housing and the support column are an integral structure. The motor is fixed to the bracket by screws. The support column is provided with a screw hole that mates with the screw. The bracket is provided with a through hole through which the screw passes. The screw passes through the through hole and mates with the screw hole.

10. An electric starter according to claim 9, characterized in that: The bracket is provided with a sleeve to increase the contact area between the screw and the bracket. The sleeve and the bracket are an integral structure, and the sleeve communicates with the through hole.

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