Electric turning gear of diesel engine

Abstract

The invention discloses an electric turning gear of a diesel engine, which belongs to the technical field of engines and comprises a motor fixedly mounted on a driving box, an output shaft of the motor is connected with a worm, and the worm is in meshed connection with a turbine in the driving box; an output shaft coaxially and fixedly connected with the turbine extends out of the side wall of the driving box and is fixedly provided with a main belt pulley; the movable arm is rotatably connected with the driving box; a rotatable auxiliary belt pulley is installed at the swing end of the movable arm, the main belt pulley and the auxiliary belt pulley are sleeved with a belt, and a turning gear is coaxially and fixedly connected to the auxiliary belt pulley. And the movable arm is fixedly connected with a handle. The device is convenient to use, good in turning precision and high in safety and reliability.

Description

Technical Field

[0001] This invention belongs to the field of engine technology, specifically an electric turning gear device for a diesel engine. Background Technology

[0002] Diesel engine turning refers to rotating key components of a diesel engine, such as the flywheel, crankshaft, and camshaft, using manual or mechanical means. Its purpose includes checking the piston's top dead center position, adjusting the phase of the fuel injection and valve train, and calibrating the parameters of various sensors.

[0003] Problems encountered during the diesel engine turning gear commissioning process include: Problem 1, manual turning is extremely labor-intensive and time-consuming; Problem 2, the electric turning gear lacks precision and cannot lock in time after rotation, resulting in uncontrollable reverse rotation and affecting positioning operations; Problem 3, the engagement and disengagement of the electric turning gear's drive force are difficult, leading to insufficient safety and reliability of equipment operation.

[0004] In existing technologies, such as the patent "Electric Turning Gear Device for Diesel Engine" with announcement number CN119122722A, the device is a handheld electric wrench, which requires overcoming the reaction torque, making operation relatively laborious; its power is limited, and it cannot lock, making it difficult to control the piston's top dead center position; when the flywheel rotates at high speed, the adapter at its power output end is difficult to disengage, and forcibly pulling it out poses a safety hazard, requiring waiting for the flywheel to stop before pulling it out, resulting in low efficiency; therefore, this device has the above three defects. Another example is the patent "An Electric Turning Gear Device for Diesel Engine" with announcement number CN115478941B, which uses gear transmission, saving effort; however, it lacks a braking mechanism, cannot control reverse rotation, and makes it difficult to control the piston's top dead center position; when the flywheel rotates at high speed, the drive device is difficult to separate from the sleeve at the power input end, also requiring waiting for the flywheel to stop before pulling it out, exhibiting the defects of problems two and three mentioned above. For example, the patent CN204186832U, "A Clutch for an Automatic Turning Gear Mechanism," only involves the turning gear clutch mechanism, using friction plates to transmit power. While clutch engagement is convenient, the phase accuracy control is insufficient due to frictional force transmission, resulting in the aforementioned problem during turning gear debugging. Another example is the patent CN118391137A, "Turning Gear Device for Diesel Engines, Diesel Engine and Vehicle." This device is directly mounted on the flywheel housing, using worm gear transmission. It is self-locking, with gears meshing with the flywheel, making turning gear operation easier. However, the microswitch controls the axial separation of the gear from the flywheel, still posing a safety issue. This is because the worm gear transmission is self-locking, meaning the worm wheel cannot drive the worm. When the microswitch controls gear separation, the worm must be driven to rotate by an external drive device. At the moment of separation, on the one hand, the worm load suddenly drops, and the external drive device's speed suddenly increases, resulting in a large impact and a risk of runaway. On the other hand, the high-speed rotating gear separates from the flywheel's outer gear ring while power is being transmitted, posing a risk of tooth breakage or damage.

[0005] Therefore, existing technologies still lack safe, reliable, precise, and easy-to-operate diesel-electric turning gear devices. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides a diesel engine electric turning gear device, which aims to achieve precise positioning through the self-locking action of the worm gear and to conveniently and safely separate the gear from the flywheel external gear ring, thereby improving the safety, reliability and accuracy of the electric turning gear device.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a diesel engine electric turning gear, comprising a drive housing and a motor fixedly mounted on the drive housing, wherein the output shaft of the motor is connected to a worm gear, and the worm gear meshes with a rotatable turbine disposed within the drive housing; characterized in that: the output shaft coaxially fixedly connected to the turbine extends from the side wall of the drive housing and is fixedly mounted with a main pulley; a movable arm coaxially mounted on the outside of the output shaft coaxially fixedly connected to the turbine and rotatably connected to the drive housing is used for swinging; a rotatable secondary pulley is mounted on the swinging end of the movable arm, and a belt is fitted on the outside of the main pulley and the secondary pulley, and a turning gear is coaxially fixedly connected to the secondary pulley; a lever is fixedly connected to the movable arm for driving the movable arm to swing.

[0008] As a further optimization, the drive box is fixedly connected to a fan plate; one end of the spring is fixedly connected to the fan plate, and the other end is connected to the swing arm, which is used to control the turning gear to move away from or closer to the flywheel external gear ring of the diesel engine under normal conditions.

[0009] As a further optimization, the fan plate is provided with an arc-shaped groove corresponding to the swing trajectory of the movable arm, and a sliding head corresponding to the arc-shaped groove is fixedly connected to the movable arm, and the sliding head is inserted into the arc-shaped groove.

[0010] As a further optimization, a fixing head is fixedly connected to the fan plate, and the two ends of the spring are fixedly connected to the fixing head and the sliding head respectively.

[0011] As a further optimization, the handlebar end has a collar, and the sliding head end has a pin for inserting the collar, for connecting the handlebar end to the sliding head.

[0012] As a further optimization, the belt is a timing belt, and both the main pulley and the auxiliary pulley are timing pulleys.

[0013] The advantages of this invention are that the rotation phase of the turning gear can be precisely controlled through the worm gear transmission pair, resulting in high accuracy and ease of use. The swingable arm allows for radial separation of the turning gear from the flywheel, effectively preventing tooth breakage or knocking, thus ensuring high safety and reliability. In summary, this device is easy to use, provides good turning accuracy, and offers high safety and reliability. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram from a first perspective of an embodiment of the present invention;

[0015] Figure 2 This is a three-dimensional structural diagram from a second perspective of an embodiment of the present invention;

[0016] Figure 3 This is a three-dimensional structural diagram from a third perspective of an embodiment of the present invention.

[0017] In the diagram: 1. Drive box; 11. Worm gear; 12. Worm; 13. Fan plate; 131. Arc-shaped slide groove; 132. Fixed head; 133. Tension spring; 2. Motor; 3. Main pulley; 4. Belt; 5. Secondary pulley; 6. Turning gear; 7. Movable arm; 71. Sliding head; 711. Pin. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some preferred embodiments of the present invention, and not all embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0019] Example; please refer to Figure 1-3 .

[0020] This embodiment provides an electric turning gear for a diesel engine, including a drive housing 1 and a motor 2 fixedly mounted on the drive housing 1 and connected to the input end of the drive housing 1. A main pulley 3 is fixedly mounted on the output shaft of the drive housing 1. A movable arm 7, rotatably connected to the drive housing 1, is fitted outside the output shaft of the drive housing 1. A secondary pulley 5 is rotatably mounted on the end of the movable arm 7 away from the drive housing 1. A belt 4 is fitted outside the main pulley 3 and the secondary pulley 5. A coaxial turning gear 6 for meshing with the flywheel of the diesel engine is fixedly connected to the secondary pulley 5. The drive housing 1 has a fan plate 13, and the fan plate 13 has a spring 133 that moves the movable end of the movable arm 7 away from the flywheel, so that the turning gear 6 is in a disengaged state from the flywheel. The movable arm 7 is connected to a lever 8 for pushing the movable arm 7 closer to the flywheel.

[0021] Spring 133 can also drive the movable end of the movable arm 7 to approach the flywheel, so that the turning gear 6 is in a constantly engaged state, and the lever 8 controls its disengagement. The constantly disengaged and constantly engaged states can be selected as needed. A worm gear 11 connected to the main pulley 3 and a worm 12 meshing with the worm gear 11 are rotatably installed inside the drive box 1. The output shaft of the motor 2 is connected to the worm 12; the motor 2 drives the worm 12 to rotate, and the worm 12 meshes with the worm gear 11, driving the worm gear 11 to rotate; the worm gear 11 is coaxially connected to the main pulley 3, thereby driving the main pulley 3 to rotate. Because the worm gear transmission has self-locking properties, it can effectively control the reverse rotation during the turning process, ensuring the accuracy of the turning. Preferably, the belt 4 is a timing belt, and both the main pulley 3 and the auxiliary pulley 5 are timing pulleys, further ensuring the accuracy of the turning.

[0022] In an exemplary manner of use, the motor 2 drives the drive box 1, which in turn drives the main pulley 3 fixed on the output shaft of the drive box 1 to rotate. The main pulley 3 transmits power to the auxiliary pulley 5 through the belt 4. The auxiliary pulley 5 is coaxially fixed with the turning gear 6, thereby driving the turning gear 6 to rotate. The turning gear 6 is designed to mesh with the diesel engine flywheel, and by rotating, it drives the diesel engine flywheel to achieve the turning operation. The movable arm 7 is fitted outside the output shaft of the drive box 1 and is rotatably connected to the drive box 1, so that the movable arm 7 can rotate around the output shaft. The spring 133 on the fan plate 13 applies a pulling force to the movable arm 7, causing its movable end to tend to move away from the flywheel. The matching lever 8 is used to push the movable arm 7 closer to the flywheel, so that the turning gear 6 can mesh with the flywheel.

[0023] To make the swing of the movable arm 7 more stable, the fan plate 13 is provided with an arc-shaped groove 131 that matches the rotation trajectory of the movable arm 7. The movable arm 7 is fixedly connected to a sliding head 71 that is slidably connected to the arc-shaped groove 131. The rotation axis of the movable arm 7 is consistent with the axis of the main pulley 3. The fan plate 13 is fixedly connected to a fixed head 132, and the two ends of the spring 133 are fixedly connected to the fixed head 132 and the sliding head 71, respectively. The arc-shaped groove 131 provides precise guidance for the rotation of the movable arm 7, ensuring that the turning gear 6 can accurately mesh with the diesel engine flywheel. The tension of the spring 133 allows the movable arm 7 to automatically reset and disengage from the flywheel after turning, improving the ease of operation. The sliding connection method increases the stability of the movable arm 7 during rotation.

[0024] An exemplary connection between the handlebar 8 and the movable arm 7 includes a collar 81 at one end and a pin 711 at the other end of the sliding head 71 for mounting the collar 81. The collar 81 is fitted onto the pin 711, thus connecting the handlebar 8 and the movable arm 7. By operating the handlebar 8, the movable arm 7 can be pushed or pulled to rotate, thereby controlling the engagement and disengagement of the turning gear 6 with the diesel engine flywheel. Preferably, the collar 81 and the pin 711 are detachable for easy maintenance and replacement.

[0025] The advantages of this embodiment are that the rotation phase of the turning gear can be precisely controlled through the worm gear transmission pair, resulting in high accuracy and ease of use. The swingable arm 7 allows for radial separation of the turning gear 6 from the flywheel, effectively preventing tooth breakage or knocking, thus ensuring high safety and reliability. In summary, this device is easy to use, provides good turning accuracy, and offers high safety and reliability.

[0026] The parts of this invention not described in detail are prior art; for those skilled in the art, the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The scope of this invention is defined by the appended claims and their equivalents.

Claims

1. A diesel engine electric turning gear device, comprising a drive housing (1) and a motor (2) fixedly mounted on the drive housing (1), wherein the output shaft of the motor (2) is connected to a worm gear (12), and the worm gear (12) is meshed with a rotatable turbine (11) disposed within the drive housing (1); characterized in that: The output shaft, coaxially fixed to the turbine (1), extends from the side wall of the drive box (1) and is fixedly mounted with a main pulley (3); the output shaft, coaxially fixed to the turbine (1), is coaxially fitted with a movable arm (7) rotatably connected to the drive box (1) for the movable arm (7) to swing; a rotatable secondary pulley (5) is mounted on the swing end of the movable arm (7); belts (4) are fitted on the outside of the main pulley (3) and the secondary pulley (5); a turning gear (6) is coaxially fixed to the secondary pulley (5). The movable arm (7) is fixedly connected to a handle (8) for driving the movable arm (7) to swing.

2. The diesel engine electric turning gear device according to claim 1, characterized in that: The drive box (1) is fixedly connected to a fan plate (13); one end of the spring (133) is fixedly connected to the fan plate (13), and the other end is connected to the swing arm (7) to control the turning gear (6) to move away from or close to the flywheel outer gear ring of the diesel engine under normal conditions.

3. The diesel engine electric turning gear device according to claim 2, characterized in that: The fan plate (13) is provided with an arc-shaped groove (131) corresponding to the swing trajectory of the movable arm (7). The movable arm (7) is fixedly connected with a sliding head (71) corresponding to the arc-shaped groove (131). The sliding head (71) is inserted into the arc-shaped groove (131).

4. The diesel engine electric turning gear device according to claim 3, characterized in that: A fixing head (132) is fixedly connected to the fan plate (13), and the two ends of the spring (133) are fixedly connected to the fixing head (132) and the sliding head (71) respectively.

5. The diesel engine electric turning gear device according to claim 4, characterized in that: The handle (8) has a collar (81) at one end, and the sliding head (71) has a pin (711) at one end for inserting into the collar (81) for connecting the end of the handle (8) to the sliding head (71).

6. The diesel engine electric turning gear device according to claim 1, characterized in that: The belt (4) is a timing belt, and the main pulley (3) and the auxiliary pulley (5) are both timing pulleys.

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