Eccentric adjusting mechanism of rotating device for pod propeller

Abstract

The utility model relates to an eccentric adjusting mechanism of a rotating device for a pod propulsor, which comprises a rotating variable-frequency driving motor, a steering gear box, an eccentric flange plate, a rotating upper sealing pressing plate, a rotating box body, a rotating pinion, a rotating gearwheel and a rotating gear transition flange, the rotary large gear is arranged on the upper flange surface of the rotary gear transition flange and is externally meshed with the rotary small gear; the steering gear box is connected with a rotary upper sealing pressing plate fixed on the rotary box body through an eccentric flange plate, the eccentric flange plate and the rotary upper sealing pressing plate are installed in a clearance fit mode, and the center distance between the rotary small gear and the rotary large gear is adjusted by turning the eccentric flange plate. By installing the eccentric flange plate, the meshing clearance between the large gear and the small gear is adjusted, and the installation precision requirement is met. The gear backlash adjustment meets the requirements of transmission reliability, installation convenience and the like of the pod propeller slewing device.

Description

Technical Field

[0001] The utility model relates to a pod propeller of a ship power propulsion system, in particular to an eccentric adjustment mechanism of a rotary device for the pod propeller. Background Art

[0002] like Figure 1 As shown, the podded propulsion system directly drives the fixed-pitch propeller to rotate through a permanent magnet variable-frequency motor. The control system adjusts the speed of the propulsion motor by controlling the propulsion inverter to change the thrust of the propeller. At the same time, the speed signal of the motor is fed back to the control system to form a closed-loop operation.

[0003] The slewing device drives the underwater structure to rotate 360° through the slewing bearing to change the thrust direction. At the same time, the rudder angle absolute position encoder feeds back the real-time rudder angle to the control system to form a closed-loop control, ultimately achieving the maneuverability of the ship.

[0004] The difficulty in installing a slewing mechanism lies in adjusting the center distance and meshing clearance between the pinion and gear. Improper meshing clearance between the pinion and gear can cause noise, vibration, and impact. Too small a center distance results in too little meshing clearance, making gear rotation inflexible and prone to sticking, which intensifies gear wear and reduces gear life. Too large a center distance between the pinion and gear leads to excessive meshing clearance, making the gear transmission susceptible to significant impact during speed changes, potentially causing tooth breakage. To ensure a proper lubricant film between the tooth surfaces and prevent thermal expansion and deformation due to increased operating temperature, the pinion and gear teeth must have an appropriate center distance when meshing.

[0005] At present, most rotary reducers adopt the form of connecting a three-in-one reduction motor and a planetary reducer with a two-stage reduction box. This structure greatly reduces the production cost. However, this type of reducer does not currently adopt an eccentric structure. Many manufacturers do not pay much attention to the meshing clearance of large and small teeth during assembly. When the meshing clearance is too small, they use a file to file the tooth top, but generally do not deal with the gap that is too large. This not only affects the service life of the large and small gears, but also easily causes accidents.

[0006] Therefore, adding an eccentric flange adjustment mechanism to the lower flange surface of the planetary reducer to adjust the meshing clearance caused by the deviation between the theoretical center distance and the actual center distance of the large and small gears due to manufacturing and processing errors, improve the stability of the gear clearance between the large gear and the small gear, ensure installation accuracy, and reduce maintenance costs are issues that urgently need to be solved in the pod thruster slewing device. Summary of the Invention

[0007] The purpose of this utility model is to provide an eccentric adjustment mechanism for the slewing device of a podded propeller. This mechanism addresses the discrepancy between the actual and theoretical center distances of the large and small gears in the slewing device of the podded propeller due to manufacturing errors, installation fit, and other factors, resulting in the gear tooth surface contact failing to meet classification society requirements. By installing an eccentric flange, the meshing clearance of the large and small gears can be adjusted to ensure installation accuracy. The tooth side clearance adjustment mechanism of this utility model meets the requirements of reliability and installation convenience for the slewing device transmission of the podded propeller.

[0008] To achieve the above-mentioned purpose, the technical solution of the present invention is: an eccentric adjustment mechanism of a rotary device for a pod thruster, comprising a rotary frequency conversion drive motor, a steering gearbox, an eccentric flange, a rotary upper sealing pressure plate, a rotary housing, a rotary pinion, a rotary gear, and a rotary gear transition flange. The rotary pinion is mounted on the output shaft of the steering gearbox, and the rotary gear is mounted on the flange surface of the rotary gear transition flange and meshes with the outside of the rotary pinion; the steering gearbox and the rotary upper sealing pressure plate fixed on the rotary housing are connected through an eccentric flange, and the eccentric flange and the rotary upper sealing pressure plate are installed with a clearance fit, and the center distance between the rotary pinion and the rotary gear is adjusted by rotating the eccentric flange.

[0009] Furthermore, the steering gearbox adopts a planetary reduction gearbox; the planetary reduction gearbox is connected to the upper flange surface of the eccentric flange through a gearbox screw.

[0010] Furthermore, the rotary frequency conversion drive motor has a built-in brake device; the rotary frequency conversion drive motor is connected to the steering gear box through a motor bolt.

[0011] Furthermore, the slewing pinion is mounted on the output shaft of the steering gear box through a flat key connection; the slewing pinion is made of alloy structural steel.

[0012] Furthermore, a slewing bearing is installed at the bottom of the slewing box through a connecting plate, which is used to transmit the steering speed and steering torque output by the steering gearbox to the pod through the slewing bearing and transmit the thrust of the propeller to the hull through the connecting plate.

[0013] Furthermore, the slewing bearing adopts a double-row ball bearing with the same diameter and has an external meshing involute cylindrical gear; the outer ring of the slewing bearing is connected to the connecting plate through the bearing outer ring bolts, and the inner ring is connected to the nacelle sling column through the bearing inner ring bolts and the transition flange.

[0014] Furthermore, the slewing pinion, the slewing gear and the slewing support bearing are lubricated in a thin oil bath and cooled naturally.

[0015] The beneficial effects of the utility model are:

[0016] 1. The overall structure is compact and the operation is stable;

[0017] 2. Simple adjustment and easy operation. The radial offset can be adjusted to achieve the most appropriate gear clearance requirements, ensuring that the center distance between the rotating pinion and the large gear of the planetary reduction gearbox output shaft remains unchanged during operation, thereby achieving the purpose of adjusting the gear meshing clearance;

[0018] 3. The eccentric flange is installed on the rotary sealing pressure plate and fixed with hexagonal bolts with holes on the head to prevent the eccentric flange from falling due to gravity and movement during the rotary motion.

[0019] 4. The utility model positions and supports the eccentric flange in the vertical direction through the stop of the rotating upper box cover. The downward force generated by the eccentric flange due to its own weight and the movement during the rotational movement is fixed by the inner hole of the rotating upper box cover, thereby ensuring the stability of the eccentric flange during the rotational movement, and further ensuring the gear meshing clearance between the large and small gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the structural arrangement diagram of the T-type pod propulsor;

[0021] Figure 2 This is the layout diagram of the T-type pod thruster slewing module;

[0022] Figure 3 It is a schematic diagram of the O-ring arrangement;

[0023] Figure 4 It is a schematic diagram of the arrangement of rotating large and small gears and eccentric flanges. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] like Figures 2 to 4 As shown, the eccentric adjustment mechanism of the slewing device of the T-type pod thruster of the utility model mainly consists of a slewing frequency conversion motor 1, a steering gearbox 2, an eccentric flange 3, a slewing upper sealing pressure plate 8, a slewing box body 9, a slewing small gear 10, a slewing large gear 11, a connecting plate 12, a slewing gear transition flange 14, a bearing outer ring bolt 15, a slewing support bearing 16, a bearing inner ring bolt 17, a rudder sealing flange body 18, a rudder sealing spacer 19, a rudder seal 20, a rudder sealing pressure plate 21, a sling connecting flange 22 and several fasteners.

[0026] According to the reliability requirements, 4 rotary frequency conversion motors 1 are selected. Figure 2The rated power and rated speed of the slewing frequency-controlled drive motor 1 are verified to ensure it can provide the torque and speed required for pod steering. The slewing frequency-controlled drive motor 1 has a built-in brake for use in emergencies or maintenance. The slewing frequency-controlled drive motor is connected to the steering gearbox 2 via motor bolts.

[0027] The steering gearbox 2 is a reduction gearbox, increasing the steering torque by reducing the output speed of the steering drive motor 1. To reduce dimensions and improve transmission capacity, the steering gearbox utilizes a planetary gear reduction mechanism. When selecting a planetary reduction gearbox, the reduction ratio, rated torque, and other parameters are determined based on the rated power and rated speed of the steering variable frequency drive motor 1. The planetary reduction gearbox is connected to the upper flange surface of the eccentric flange 3 via gearbox screws 4 and 5.

[0028] The lower flange surface of the eccentric flange 3 is connected to the upper rotary sealing plate 8 via bolts 6. The eccentric flange 3 is constructed of structural steel and is installed with a clearance fit within the upper rotary sealing plate 8. The center distance e between the rotating pinion 10 and the rotating gear 11 can be adjusted by rotating the eccentric flange 3.

[0029] The slewing pinion 10 is mounted on the output shaft of the steering gearbox 2 via a keyed connection. To meet strength and life requirements, the slewing pinion 10 is constructed of alloy structural steel, with the tooth surfaces carburized and quenched. The material quality grade is no less than MQ grade as specified in GB / T8539-2000, and the gear machining accuracy meets the Grade 6 precision requirements specified in GB / T10095.1-2008. The slewing gear 11 externally meshes with the slewing pinion 10 and is mounted on the upper flange surface of the slewing gear transition flange 14.

[0030] The slewing bearing 16 transmits the steering speed and torque output by the steering gearbox 2 to the pod, while also transmitting the propeller thrust to the hull via the connecting plate. The slewing bearing 16 utilizes a double-row, same-diameter ball bearing designed as an externally meshed involute cylindrical gear. The outer ring of the slewing bearing is connected to the connecting plate 12 via bearing outer ring bolts 15, while the inner ring is connected to the pod davit connecting flange via bearing inner ring bolts 17. The slewing pinion 10, gear 11, and slewing bearing 16 are lubricated in a VG320 oil bath with natural cooling.

[0031] This type of eccentric adjustment mechanism overcomes the drawback of planetary reduction gearboxes without eccentric adjustment, which prevents the meshing clearance of the large and small gears from being adjustable. This frees the manufacturer from restrictions on actual design, selection, manufacturing, and processing. It allows for convenient adjustment of the center distance between the large and small gears, thereby adjusting the meshing clearance and ensuring optimal operation of the slewing mechanism. Furthermore, the eccentric adjustment mechanism requires only rotating the eccentric sleeve, making operation simple. The adjustment sleeve itself is also simple to manufacture and process, making it easy to implement in mass production.

[0032] Adopt modular design and layout. First, clean the anti-rust oil of the suspender connection flange 22 with alcohol and wipe the surface with gauze until the metallic glossy surface appears. O-ring Q1 (see Figure 3 ), apply an appropriate amount of grease and install it into the O-ring groove on the upper surface of the sling connection flange 22; hoist the slewing support bearing 16 to a horizontal ground, check the appearance integrity, clean it and install it into the stop of the sling connection flange 22, and tighten it with the hexagon socket head screw 17 and spring washer. Apply an appropriate amount of extreme pressure lithium-based grease to the lip seal of the steering seal 20, install it into the stop of the steering seal flange body 18, and tighten the steering seal pressure plate 21 to the steering seal flange body with a hexagon head bolt with a hole in the head to form the steering seal module. O-ring 2 Q2 (see Figure 3 ) Apply an appropriate amount of grease and install it into the O-ring groove on the upper surface of the steering seal flange 18. The steering seal module is installed as a whole on the lower surface of the outer ring of the slewing bearing 16. Use M30 spring washers to fix the steering seal module to the outer ring of the slewing bearing (18). O-ring three Q3, O-ring four Q4 (see Figure 3 ) Apply an appropriate amount of grease and install it into the O-ring groove on the outer ring of the slewing bearing 16. Clean the connecting plate 12 and install it on the corresponding stop on the outer ring of the slewing bearing. Tighten it with a hexagonal head bolt with a hole on the head. O-ring 5 Q5 (see Figure 3 Apply an appropriate amount of grease and install it into the O-ring groove on the upper surface of the inner ring of the slewing bearing 16. Clean the slewing gear transition flange 14 and install the slewing gear transition flange on the corresponding stop on the upper surface of the inner ring of the slewing bearing. Install the large gear at the stop on the upper surface of the outer ring of the slewing gear transition flange, and tighten the large rotating gear 11 and the slewing gear transition flange 14 with a hexagonal head bolt with a hole on the head. The slewing pinion 10 is connected to the output shaft of the planetary reduction gearbox through a flat key (not shown in the figure). The shaft and the hole are interference fit, and the slewing pinion is installed by heat sleeve. When the slewing pinion and the large gear are pre-installed, a color check is required, and the tooth surface contact area must meet the requirements of the CCS classification society specifications. At the same time, an internal threaded tapered pin is provided. Clean the slewing box body 9 and install it on the outer ring stop on the upper surface of the connecting plate 12. O-ring seven Q7 (see Figure 3 ) Apply an appropriate amount of grease and install it in the O-ring groove on the upper surface of the rotary box; clean the rotary upper sealing pressure plate 8, install it on the upper surface of the rotary box 9, and tighten it with the hexagonal head bolt 7 with a hole on the head. O-ring six Q6, O-ring eight Q8 (see Figure 3 ) Apply a proper amount of grease, clean the eccentric flange 3, and insert the O-ring 6 Q6 (see Figure 3 ) is installed in the radial sealing ring groove of the eccentric flange, O-ring eight Q8 (see Figure 3) into the sealing groove on the upper surface of the eccentric flange. The lower end of the eccentric flange is clearance-fitted with the shaft and hole on the upper cover of the rotary housing. Use hexagon socket head screws 6 to tighten the outer ring of the eccentric flange 3 to the upper sealing pressure plate of the rotary housing. Secure the inner ring to the planetary reduction gearbox with the matching spring washers. Finally, install the rotary frequency converter motor 1 on the flange surface of the planetary reduction gearbox 2. Tighten all bolts according to the tightening torque specified in the technical documentation. After assembling the rotary module, manually turn the planetary gearbox output shaft to check the operating status of the rotary bearing.

Claims

1. An eccentric adjustment mechanism for a slewing device of a podded propulsion system, characterized in that: It includes a rotary frequency conversion drive motor, a steering gearbox, an eccentric flange, a rotary upper sealing pressure plate, a rotary box body, a rotary pinion, a rotary gear, and a rotary gear transition flange. The rotary pinion is installed on the output shaft of the steering gearbox, and the rotary gear is installed on the flange surface of the rotary gear transition flange and engages with the outside of the rotary pinion. The steering gearbox and the rotary upper sealing pressure plate fixed on the rotary box body are connected through an eccentric flange, and the eccentric flange and the rotary upper sealing pressure plate are installed with a clearance fit. The center distance between the rotary pinion and the rotary gear is adjusted by rotating the eccentric flange.

2. The eccentric adjustment mechanism of the rotary device for the podded propulsion system according to claim 1, characterized in that: The steering gearbox adopts a planetary reduction gearbox; the planetary reduction gearbox is connected to the flange surface on the eccentric flange through gearbox screws.

3. The eccentric adjustment mechanism of the rotary device for the podded propulsion system according to claim 1, characterized in that: The rotary frequency conversion drive motor has a built-in brake device; the rotary frequency conversion drive motor is connected to the steering gear box through a motor bolt.

4. The eccentric adjustment mechanism of the rotary device for the podded propulsion system according to claim 1, characterized in that: The slewing pinion is installed on the output shaft of the steering gearbox through a flat key connection; the slewing pinion is made of alloy structural steel.

5. The eccentric adjustment mechanism of the rotary device for the podded propulsion system according to claim 1, characterized in that: A slewing bearing is installed at the bottom of the slewing box through a connecting plate, which is used to transmit the steering speed and steering torque output by the steering gearbox to the pod through the slewing bearing, and at the same time transmit the thrust of the propeller to the hull through the connecting plate.

6. The eccentric adjustment mechanism of the rotary device for the podded propulsion system according to claim 5, characterized in that: The slewing bearing adopts double-row ball bearings with the same diameter and has an external meshing involute cylindrical gear; the outer ring of the slewing bearing is connected to the connecting plate through the bearing outer ring bolts, and the inner ring is connected to the nacelle davit through the bearing inner ring bolts and the transition flange.

7. The eccentric adjustment mechanism of the rotary device for the podded propulsion system according to claim 6, characterized in that: The slewing pinion, slewing gear and slewing support bearing are lubricated in a thin oil bath and cooled naturally.

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