Eccentric adjusting mechanism of rotating device for pod propeller

Abstract

The invention relates to an eccentric adjusting mechanism of a slewing device for a pod propeller, which comprises a slewing variable frequency driving motor, a steering gear box, an eccentric flange plate, a slewing upper sealing pressing plate, a slewing box body, a slewing pinion, a slewing bull gear and a slewing 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 of 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 invention relates to a pod propeller of a ship power propulsion system, in particular to an eccentric adjustment mechanism of a rotating device for the pod propeller. Background Art

[0002] like Figure 1 As shown, the pod propulsion system directly drives the fixed-pitch propeller to rotate through the 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 the slewing device lies in the adjustment of the center distance and meshing clearance between the small gear and the large gear. If the meshing clearance of the large and small gears is not appropriate, noise, vibration, impact, etc. will occur. Because the center distance is too small, the meshing clearance of the gears is too small, the gears are not flexible, and the gears are easily stuck, which aggravates the wear of the gears and reduces the life of the gears; if the center distance of the large and small gears is too large, the meshing clearance is too large, and the gear transmission is prone to huge impact when changing speed, causing broken teeth, etc. In order to ensure the formation of a normal lubricating oil film between the tooth surfaces and prevent the gear teeth from getting stuck due to thermal expansion deformation caused by the increase in the working temperature of the gears, the large and small 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 two-stage planetary reducer. This structure greatly reduces the production cost. However, this type of reducer does not currently use an eccentric structure. Many manufacturers do not deal with 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, and generally do not deal with the excessive clearance. 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 addressed in the pod thruster slewing device. Summary of the invention

[0007] The purpose of the present invention is to provide an eccentric adjustment mechanism for a slewing device of a pod propeller, so as to solve the problem that the actual center distance between the large and small gears of the slewing device of the pod propeller is different from the theoretical center distance due to manufacturing errors, installation matching relationships, etc., resulting in the large and small gear tooth surface contact failing to meet the requirements of the classification society. By installing an eccentric flange, the meshing clearance of the large and small gears can be adjusted to ensure the installation accuracy requirements. The tooth side clearance adjustment of the present invention meets the requirements of reliability and installation convenience of the slewing device transmission of the pod propeller.

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

[0009] Furthermore, the steering gear box adopts a planetary reduction gear box; the planetary reduction gear box is connected to the flange surface on the eccentric flange through a gear box 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 motor bolts.

[0011] Furthermore, the slewing pinion is installed 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 gear box 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 present invention are:

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

[0017] 2. Simple adjustment and easy operation. The radial offset adjustment is realized to achieve the most appropriate gear clearance requirement, ensuring that the center distance between the rotating pinion and the large gear of the output shaft of the planetary reduction gearbox remains unchanged during operation, so as to achieve the function of adjusting the gear meshing clearance;

[0018] 3. The eccentric flange is installed on the rotating upper sealing 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 rotating motion.

[0019] 4. The present invention positions and vertically supports the eccentric flange through the stopper of the rotating upper box cover. The downward force generated by the eccentric flange due to its own weight and the movement during the rotating motion is fixed by the inner hole of the rotating upper box cover, thereby ensuring the stability of the eccentric flange during the rotating motion 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 layout of the T-type pod thruster;

[0021] Figure 2 This is the layout diagram of the T-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 in conjunction with 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 present invention is mainly composed of a slewing frequency conversion motor 1, a steering gear box 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 ring 19, a rudder seal 20, a rudder sealing pressure plate 21, a sling connecting flange 22 and a plurality of fasteners.

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

[0027] The steering gearbox 2 is of reduction type, which increases the output steering torque by reducing the output speed of the steering drive motor 1. In order to reduce the structural size and improve the transmission capacity, the steering gearbox adopts a planetary gear reduction form. When selecting a planetary reduction gearbox, the reduction ratio, rated torque and other parameters of the planetary reduction gearbox are determined according to the rated power and rated speed of the steering variable frequency drive motor 1. The planetary reduction gearbox is connected to the flange surface on the eccentric flange 3 through the gearbox screws 4 and 5.

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

[0029] The slewing pinion 10 is installed on the output shaft of the steering gearbox 2 through a flat key connection. In order to meet the strength and life requirements, the slewing pinion 10 is made of alloy structural steel, and the tooth surface is carburized and quenched. The material quality grade is not lower than the MQ grade specified in GB / T8539-2000, and the gear processing accuracy grade meets the 6-grade accuracy requirements specified in GB / T10095.1-2008. The slewing large gear 11 is externally meshed with the slewing pinion 10 and is installed on the flange surface of the slewing gear transition flange 14.

[0030] The function of the slewing bearing 16 is to transmit the steering speed and steering torque output by the steering gearbox 2 to the pod and transmit the thrust of the propeller to the hull through the connecting plate. The slewing bearing 16 uses a double-row ball bearing with the same diameter and is designed as an external meshing involute cylindrical gear. The outer ring of the slewing bearing is connected to the connecting plate 12 through the bearing outer ring bolt 15, and the inner ring is connected to the pod sling through the bearing inner ring bolt 17. The slewing pinion 10, the large gear 11, and the slewing bearing 16 are lubricated with a thin oil bath, and the lubricating oil grade is VG320, and naturally cooled.

[0031] This type of eccentric adjustment mechanism overcomes the drawback that the meshing clearance of the large and small gears cannot be adjusted when the planetary reduction gearbox does not have an eccentric adjustment function, so that the actual design selection, production and manufacturing are not restricted by the manufacturer, and the center distance of the large and small gears can be easily adjusted, thereby adjusting the meshing clearance and making the rotary mechanism work in the best state. In addition, the eccentric adjustment mechanism only needs to rotate the eccentric sleeve, which is simple to operate, and the adjustment sleeve itself is simple to manufacture and process, and it is easy to achieve mass production.

[0032] Adopt modular design and layout. First, clean the anti-rust oil of the hanging column connection flange 22 with alcohol, and wipe the surface with gauze until the metallic glossy surface appears. O-ring - Q1 (see Figure 3 ), apply a proper amount of grease and install it into the O-ring groove on the upper surface of the column connection flange 22; hoist the slewing bearing 16 to the horizontal ground, check the appearance integrity, install it to the stop of the column connection flange 22 after cleaning, and tighten it with the hexagon socket head screw 17 and spring washer. Apply a proper amount of extreme pressure lithium-based grease to the lip seal of the steering seal 20, install it to the stop of the steering seal flange body 18, and tighten the steering seal pressure plate 21 and the steering seal flange body with the hexagon head bolt with a hole on the head as a steering seal module. O-ring II Q2 (see Figure 3 ) Apply an appropriate amount of grease and install it to 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 with spring washers to fix the steering seal module and the outer ring of the slewing bearing (part 18). O-ring three Q3, O-ring four Q4 (see Figure 3 ) Apply an appropriate amount of grease, install it into the O-ring groove on the outer ring of the slewing bearing 16, clean the connecting plate 12, install it on the corresponding stop of the outer ring of the slewing bearing, and tighten it with a hexagonal head bolt with a hole on the head. O-ring five 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 slewing 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 inspection 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 installed. Clean the slewing housing 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 an appropriate amount of grease, clean the eccentric flange 3, and replace the O-ring 6 Q6 (see Figure 3 ) is installed in the radial sealing ring groove of the eccentric flange, and the O-ring eight Q8 (see Figure 3) is installed in the sealing groove on the upper surface of the eccentric flange. The lower end of the eccentric flange is matched with the shaft and hole of the upper cover plate of the rotary box body with clearance. Use the hexagon socket head screw 6 to tighten the outer ring of the eccentric flange 3 with the rotary upper sealing pressure plate, and fix the inner ring with the planetary reduction gearbox with the matching spring washer. Finally, install the rotary frequency conversion motor 1 on the flange surface of the planetary reduction gearbox 2. All bolts must be tightened according to the tightening torque required in the technical documents. After the rotary module is assembled, turn the output shaft of the planetary gearbox by hand to check the operating status of the rotary bearing.

Claims

1. An eccentric adjustment mechanism for a slewing device of a pod thruster, characterized in that: It includes a rotary frequency conversion drive motor, a steering gear box, 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 gear box, 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 gear box is connected to the rotary upper sealing pressure plate fixed on the rotary housing through an eccentric flange, and the eccentric flange is installed with a clearance fit with the rotary upper sealing pressure plate. 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 pod thruster according to claim 1, characterized in that: The steering gear box adopts a planetary reduction gear box; the planetary reduction gear box is connected to the flange surface on the eccentric flange through the gear box screws.

3. The eccentric adjustment mechanism of the rotary device for the pod thruster according to claim 1, characterized in that: The rotary frequency conversion drive motor is equipped with 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 pod propulsion device 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 pod propulsion device 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 gear box to the pod through the slewing bearing and transmit the thrust of the propeller to the hull through the connecting plate.

6. The eccentric adjustment mechanism of the rotary device for the pod propulsion device according to claim 5, characterized in that: 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 outer ring bolts of the bearing, and the inner ring is connected to the nacelle sling column through the transition flange of the bearing inner ring bolts.

7. The eccentric adjustment mechanism of the rotary device for the pod propulsion device 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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