RU224968U1 - Three-stage marine gear reducer - Google Patents

Abstract

The utility model relates to the field of shipbuilding, in particular, to ship gear reducers with herringbone gears and wheels in them. The utility model solves the problem of ensuring compactness and increasing the reliability of a marine gear reducer through the use of a three-stage torque transmission scheme and division of the power flow on intermediate shafts, as well as optimal placement of the gear lubrication pump drive. The proposed three-stage marine gear reducer contains a housing with bearings built into it, in which are placed vertically spaced, with horizontal axes, drive, first and second intermediate and output shafts with herringbone gears and wheels on them, with a herringbone gear located in the middle of the drive shaft is engaged with a corresponding chevron gear on the first intermediate shaft, on which a gear is also made in the form of half-chevrons symmetrically spaced on both sides of the chevron gear, engaged with the corresponding half-chevrons of gears on two second intermediate shafts, and made in the middle of both second intermediate shafts herringbone gears are meshed with a corresponding herringbone gear on the output shaft, and the drive, as well as the first and both second intermediate shafts are placed in bearings with the possibility of axial movement, and the output shaft is fixed from axial movement by an angular contact bearing, while on the output with On the side of the propeller shaft, from the gearbox housing, and at the end of one of the second intermediate shafts, a drive is made for a gear lubrication pump located on the gearbox housing.

Description

The utility model relates to the field of shipbuilding, in particular to ships gear reducers with herringbone gears and wheels in them.

A known gear scheme with spaced half-chevrons of gears and wheels (see, for example, the book: N.L. Kazakevich “Powerful high-speed gears.” “Mashgiz”, Moscow-Sverdlovsk, 1950, pp. 11...16, fig. .5,9).

A chevron gear train with two interacting chevron gears is known, one of which is made in the form of two spaced apart half-chevrons installed with the possibility of axial movement relative to each other (see, for example, invention patent RU 2010135 C1, published on March 30, 1994).

The main ship power plant with a fixed pitch propeller is known, in which a summing gear reducer is installed with two drive shafts with gears on them, intermediate shafts with gears and wheels on them and an output shaft with a gear on it and where in gears on the intermediate shafts friction clutches are made with hydraulic control with the possibility of their connection with the shafts, and the gears on the intermediate shafts are made in mesh with the wheel on the output shaft (see, for example, utility model patent RU 154859 U1, publ. 09/10/2015).

There is a known diagram of a three-stage helical gearbox with bifurcated high-speed and low-speed gears, where in order to evenly distribute the load between parallel gears, one of the shafts of the high-speed and low-speed gears must be capable of axial movement (see, for example, the Internet, artesk. ru/reduktor opisanie. html , Fig. 5).

The proposed utility model solves the problem of ensuring compactness and increasing the reliability of a marine gear reducer.

This problem is solved due to the fact that the proposed three-stage marine gear reducer contains a housing with built-in bearings, which house vertically spaced, with horizontal axes, drive, first and second intermediate and output shafts with herringbone gears and wheels on them, with In this case, a chevron gear located in the middle of the drive shaft is engaged with a corresponding chevron gear on the first intermediate shaft, on which a gear is also made in the form of half-chevrons symmetrically spaced on both sides of the chevron gear, meshed with the corresponding half-chevrons of gears on two second intermediate shafts , and the herringbone gears made in the middle of both second intermediate shafts are engaged with the corresponding herringbone gear on the output shaft, and the drive, as well as the first and both second intermediate shafts are placed in bearings with the possibility of axial movement, and the output shaft is fixed from axial movement radially a thrust bearing, while at the output end of one of the second intermediate shafts from the propeller shaft side of the gearbox housing, a drive is made for a gear lubrication pump located on the gearbox housing.

The technical result provided by the above set of features is the compactness and increased reliability of the marine gear reducer through the use of a three-stage torque transmission scheme and division of the power flow on the intermediate shafts, as well as optimal placement of the gear lubrication pump drive.

The proposed three-stage marine gear reducer is schematically shown in Fig. 1 and Fig. 2, which shows the spatial position of the axes of the shafts, gears and gear wheels.

The gearbox housing 1 contains vertically spaced, with horizontal axes, drive shaft 2, the first 3 and second 4 and 5 intermediate shafts and the output shaft 6. A herringbone gear 7 made in the middle of the drive shaft 2 is meshed with a corresponding herringbone gear 8 on the first intermediate shaft 3. On shaft 3 there is also a gear in the form of half-chevrons 9 and 10 symmetrically spaced on both sides of the chevron gear 8, meshed with their corresponding half-chevrons, respectively, 11, 12 and 13, 14 gear wheels on the second intermediate shafts 4 and 5 , respectively. Made in the middle of the second intermediate shafts 4, 5, the chevron gears 15, 16, respectively, are engaged with the corresponding chevron gear 17 on the output shaft 6. In this case, the drive shaft 2, as well as the first 3 and second 4 and 5 intermediate shafts are located in built-in in the housing 1 and made of radial bearings 18 with the possibility of axial movement. The output shaft 6 is placed on one side in a radial bearing 18, and on the other - in an angular contact bearing 19, which is secured against axial movement.

At the output end of one of the second intermediate shafts, for example 5, on the side of the propeller shaft (not shown in Fig. 1, 2) from the gearbox housing 1, there is a drive 20 of the gear lubrication pump 21 located on the gearbox housing.

The proposed three-stage marine gear reducer is in operation as follows (see Fig. 1, 2).

The torque, which must be transmitted by the gearbox from the engine to the propeller shaft (not shown in Fig. 1, 2) of the vessel, comes from the engine to the drive shaft 2, located in the bearings 18 built into the gearbox housing 1. Then through the chevron toothed gear 7 to a chevron gear 8 meshed with it, made on the first intermediate shaft 3. Then, through a gear made on shaft 3 in the form of half-chevrons 9 and 10 to the half-chevron gears meshed with them, respectively 11, 12 and 13, 14 , made on the second intermediate shafts, 4 and 5, respectively. Then, through the gears 15, 16 made on the shafts 4, 5, the torque is transmitted to the gear 17 on the output shaft 6 and then from it to the propeller shaft of the vessel. Drive 2 and intermediate shafts 3, 4, and 5, located in radial bearings 18, have the ability axial movement, which is important for uniform load distribution when transmitting torque by their herringbone gears and wheels. The angular contact bearing 19 secures the output shaft 6 from axial movements, which prevents, in particular, the transfer of possible axial forces to the propeller shaft. With the start of rotation of the gearbox shafts, including shaft 5, the lubrication pump 21 begins to operate simultaneously through the drive 20.

Making the gearbox three-stage at a given distance between the axes of the drive shaft 2 and the output shaft 6 ensures reduced diameters of the herringbone gears and wheels.

Dividing the chevron gears and wheels into half-chevrons (bifurcation of the power flow) reduces the size of the gearbox along the shafts. The arrangement of the drive 20 of the gear lubrication pump 21 on one of the second intermediate shafts simplifies the design of the pump, as it ensures its operation at an optimal rotation speed.

Currently, the “Branch of PJSC “UEC-Saturn”-NTC St. Petersburg” has completed pre-design work on the proposed gearbox.

Claims (1)

A three-stage marine gear reducer, characterized by the fact that it contains a housing with bearings built into it, in which there are vertically spaced, with horizontal axes, drive, first and second intermediate and output shafts with herringbone gears and wheels on them, while the drive is located in the middle of the shaft, the herringbone gear is meshed with a corresponding herringbone gear on the first intermediate shaft, on which a gear is also made in the form of half-chevrons symmetrically spaced on both sides of the herringbone gear, meshed with the corresponding half-chevrons of gears on two second intermediate shafts, and made in the middle of both second intermediate shafts, the herringbone gears are engaged with the corresponding herringbone gear on the output shaft, and the drive, as well as the first and both second intermediate shafts are placed in bearings with the possibility of axial movement, and the output shaft is fixed from axial movement by an angular contact bearing, with In this case, at the output end of one of the second intermediate shafts from the side of the propeller shaft from the gearbox housing, a drive is made for a gear lubrication pump located on the gearbox housing.