JP2007085467A - Power transmission gear and reduction gear for shipping, including shaft coupling and manufacturing method of shaft coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission gear and a reduction gear for shipping, including a shaft coupling, absorbing an axial displacement caused in shafting of the power transmission gear including the shaft coupling between an input shaft and an output shaft of the shafting where a mechanical reduction gear is interposed, and preventing the occurrence of local strong tooth bearing due to such axial displacement to avoid breakage of the tooth part. <P>SOLUTION: In this power transmission gear including the shaft coupling in which the shaft coupling is installed between the input shaft and the output shaft of the shafting where the mechanical reduction gear is interposed, the shaft coupling includes a geared shaft coupling, which transmits the turning force between the input shaft and the output shaft by meshing of the external tooth and the internal tooth, and when the meshing pitch circle diameter D of the external tooth and the internal tooth is D, the transmission torque of the geared shaft coupling is T, the coefficient of friction of meshing tooth flanks of the external tooth and the internal tooth is μ, and the thrust load applied to the geared shaft coupling is F, the geared shaft coupling is constructed to satisfy the expression D>(2μT)/F. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power transmission device provided with a shaft coupling, in which a shaft coupling is installed between an input shaft and an output shaft, a method for manufacturing the power transmission device, and a marine speed reducing device provided with the shaft coupling.

  A power transmission device in which a shaft coupling is installed between an input shaft and an output shaft of a shaft system is, for example, a prime mover (steam turbine) as provided in Patent Document 1 (Japanese Patent Laid-Open No. 11-270571). ) Is transmitted to the speed reducer via the gear shaft coupling, and the steam turbine power generation device that drives the generator by decelerating at a predetermined reduction ratio with the speed reducer, or Japanese Patent Laid-Open No. 8-61473. ) Is transmitted to the speed reducer via the gear shaft joint, and the speed reducer for the ship which drives the propeller by decelerating at a predetermined reduction ratio with the speed reducer. Many have been applied.

JP-A-11-270571 JP-A-8-61473

FIG. 5 shows a power transmission device in which a shaft coupling is installed between the input shaft and the output shaft as described above. It is a schematic diagram which shows a local tooth | gear contact occurrence state.
In the figure, 1 is a turbine (prime mover) such as a steam turbine or a gas turbine, 2 is a first stage reducer, and the first stage reducer 2 is composed of one pinion gear 21 and two wheel gears 22, 22. Is configured to mesh. Reference numeral 4 denotes a gear shaft joint that connects the turbine 1 and the pinion gear 2, external teeth 44 and 45 formed at both ends of the connection shaft 42, the output shaft of the turbine 1 and the input of the pinion gear 2. A rotational force is transmitted between the output shaft of the turbine 1 and the input shaft of the pinion gear 2 by meshing with the internal teeth 41 and 43 respectively provided on the shaft.
Reference numerals 7 and 7 denote shaft couplings for connecting the wheel gears 22 and 22 to the output shafts 22a and 22a of the first stage speed reducer 2. The rotational force after deceleration by the first stage speed reducer 2 is the shaft coupling 7 7 through output shafts 22a and 22a to a second speed reducer (not shown).

In a marine speed reducing device equipped with such a gear shaft joint, axial displacement occurs due to movement of the shaft system, deformation of the hull, thermal elongation of the shaft system, and the like accompanying the propulsive force of the ship. The thrust load due to such axial displacement is absorbed by a thrust bearing provided on the propeller shaft or a thrust bearing provided on the turbine 1 side.
However, with regard to the axial displacement of the shaft system between the turbine 1 where the gear shaft joint 4 is installed and the pinion gear 21 of the first stage reduction gear 2, the axial direction applied to the gear shaft joint 4 has heretofore been known. Since no means for absorbing the displacement was taken, as shown in FIG. 5, a strong tooth contact locally at the meshing portion between the pinion gear 21 and the two wheel gears 22 and 22 due to the axial displacement of the shaft system. 61 and 62 may occur, and the tooth portion of the first stage reduction gear 2 may be damaged.
The Patent Documents 1 and 2 do not show means for dealing with such a problem.

  In view of the problems of the prior art, the present invention provides axial displacement generated in a shaft system of a power transmission device having a shaft coupling between an input shaft and an output shaft of a shaft system in which a gear reduction device is interposed. Provided is a power transmission device and a marine speed reducer equipped with a shaft joint that can be absorbed by the joint and prevents local gear tooth contact of the gear speed reducer due to such axial displacement and avoids tooth damage. The purpose is to do.

The present invention achieves such an object, in a power transmission device having a shaft coupling, wherein a shaft coupling is installed between an input shaft and an output shaft of a shaft system in which a gear reduction device is interposed. The shaft coupling includes a gear shaft coupling that transmits a rotational force between the input shaft and the output shaft by meshing between the external teeth and the internal teeth, and the gear shaft coupling is a meshing pitch between the external teeth and the internal teeth. Circle diameter D
The transmission torque of the gear shaft joint is T,
The friction coefficient of the meshing tooth surface of the external teeth and internal teeth is μ,
The thrust load acting on the gear shaft joint is F,
When
D> (2 μT) / F (1)
It is characterized by being configured to be.

Further, the invention of a method for manufacturing a power transmission device having a shaft coupling, in which a shaft coupling is installed between an input shaft and an output shaft of a shaft system in which a gear reduction device is interposed, The gear shaft coupling is configured to transmit a rotational force between the input shaft and the output shaft by meshing between the external teeth and the internal teeth, and the friction coefficient of the meshing tooth surface between the external teeth and the internal teeth in the gear shaft coupling. μ
The meshing pitch circle diameter of the outer teeth and inner teeth is D,
The transmission torque of the gear shaft joint is T,
The thrust load acting on the gear shaft joint is F,
When
μ <(FD) / (2T) (2)
Set to be.

  According to this invention, the meshing pitch circle diameter D between the outer teeth and the inner teeth of the gear shaft joint and the thrust load F acting on the gear shaft joint are in an inversely proportional relationship as shown in the equation (1), and the meshing The pitch circle diameter D is configured to be a gear shaft joint set to a pitch circle diameter D that exceeds the pitch circle diameter D0 = (2 μT) / Fa corresponding to the allowable value (allowable thrust load) Fa of the thrust load F, or the gear By setting the friction coefficient μ of the meshing tooth surface between the outer tooth and the inner tooth of the shaft coupling as described in (2) above, the meshing frictional force of the meshing tooth portion can be suppressed to the allowable thrust load Fa or less. In addition, it is possible to prevent the occurrence of local strong tooth contact of the gear reduction device due to the thrust load accompanying the axial displacement of the shaft system of the gear reduction device.

  Further, the present invention provides a power transmission device including a shaft coupling in which a shaft coupling is installed between an input shaft and an output shaft of a shaft system in which a gear reduction device is interposed. A diaphragm shaft joint having a diaphragm interposed between the shaft side and the output shaft side. The diaphragm shaft joint has a thrust load generated by the axial rigidity of the diaphragm due to the axial rigidity of the diaphragm shaft joint. Is set to be equal to or less than the allowable thrust load (claim 3).

  According to this invention, the axial rigidity (axial spring constant) of the diaphragm of the diaphragm shaft joint is the thrust load Fs generated by the axial rigidity of the diaphragm shaft joint, that is, (Fs = axial rigidity × axis of shaft joint). If the directional displacement is set to be equal to or less than the allowable thrust load Fa (Fs ≦ Fa), the thrust load Fs can be absorbed by the axial rigidity of the diaphragm in the diaphragm shaft joint, and the gear reduction device using the thrust load Fs It is possible to prevent the occurrence of strong local tooth contact.

Further, the present invention provides a power transmission device including a shaft coupling in which a shaft coupling is installed between an input shaft and an output shaft of a shaft system in which a gear reduction device is interposed. A gear shaft coupling for transmitting a rotational force between the input shaft and the output shaft by meshing with the inner teeth, and a diaphragm shaft coupling formed by interposing a diaphragm between the input shaft side and the output shaft side; Are connected in series (Claim 4).
According to this invention, since the gear shaft joint and the diaphragm shaft joint are connected in series to receive the thrust load Fs, the diaphragm that can accurately set the axial rigidity in advance and can reliably absorb the thermal expansion of the shaft system. By connecting the shaft joint in series with the gear shaft joint, even if the gear shaft joint cannot completely absorb the thrust load due to thermal elongation, the diaphragm shaft joint can reliably absorb the thrust load due to thermal elongation.

  Further, in this invention, the gear shaft coupling is set to a pitch circle diameter (D> (2 μT) / F) as in claim 1, and the diaphragm shaft coupling is set in the axial rigidity of the diaphragm as in claim 3. If it is configured such that (thrust load Fs = axial rigidity × axial displacement of the shaft coupling) is set to be equal to or less than the allowable thrust load Fa (Fs ≦ Fa) (Claim 5), the gear shaft coupling and the diaphragm Thrust load absorption effect combined with shaft coupling can be more reliably exhibited.

  According to another aspect of the present invention, there is provided a marine speed reducing device according to claim 1, wherein a shaft coupling is installed between a marine motor and a speed reducer that decelerates the rotation of the motor at a predetermined reduction ratio. If the shaft coupling according to item 3, the shaft coupling according to claim 4, the shaft coupling according to claim 5, or a combination thereof is configured (claim 6), a marine reduction device is configured. It is possible to reliably prevent the occurrence of local strong tooth contact of the gear reduction device, and to obtain a marine reduction device including a shaft coupling that reliably avoids damage to the tooth portion.

  According to the present invention, in a power transmission device including a shaft coupling between an input shaft and an output shaft of a shaft system in which a gear reduction device is interposed, the pitch circle diameter D exceeds D = (2 μT) / Fa. A gear shaft coupling set to a pitch circle diameter is used, or a diaphragm shaft coupling whose thrust load Fs = axial rigidity × axial displacement of the shaft coupling is equal to or less than an allowable thrust load Fa (Fs ≦ Fa) is used. Alternatively, by connecting a diaphragm shaft joint capable of reliably absorbing thermal elongation in series with the gear shaft joint, axial displacement generated in the shaft system of the reduction gear can be reliably absorbed by the shaft joint. It is possible to prevent the occurrence of local strong tooth contact of the gear reduction device due to the displacement, and it is possible to avoid damage to the tooth portion in the shaft coupling of the reduction device.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

FIG. 1 is a configuration diagram of a marine vessel propulsion apparatus to which the present invention is applied.
In FIG. 1, 1 is a turbine (prime mover) such as a steam turbine or a gas turbine which is a main engine, 2 is a first stage reducer, 3 is a second stage reducer, 33 is a propeller shaft, 34 is a propeller, and 100 is the aforementioned The shaft coupling is interposed between the output side of the turbine 1 and the input side of the first stage speed reducer 2 and has a configuration described later. 1a is a turbine main shaft, 8 is a turbine side thrust bearing, and 35 is a propeller side thrust bearing.
The first stage reduction gear 2 is configured by two wheel gears 22 and 22 meshing with one pinion gear 21. Reference numerals 7 and 7 denote shaft couplings for connecting the wheel gears 22 and 22 to the output shafts 22a and 22a of the first stage reduction gear 2, respectively. Further, the second stage speed reducer 3 is configured such that one wheel gear 32 is engaged with pinion gears 31 and 31 connected to the two output shafts 22a and 22a of the first stage speed reducer 2, respectively. .

In such a marine vessel propulsion device, the rotational force of the turbine 1 is transmitted to the first stage speed reducer 2 via the shaft coupling 100, and the pinion gear 21 and the wheel gears 22, 22 are transmitted in the first stage speed reducer 2. The first speed reduction is performed with the ratio of the number of teeth to the first gear, and the transmission is transmitted to the pinion gears 31, 31 of the second speed reducer 3 through the two output shafts 22a, 22a of the first speed reducer 2. Then, the second speed reduction is performed by the gear ratio between the pinion gears 31 and 31 and the wheel gear 32. The rotational force subjected to the two-stage deceleration is transmitted from the propeller shaft 33 to the propeller 34.
The present invention relates to a shaft coupling 100 applied to a marine vessel propulsion apparatus as described above.

FIG. 2 is a sectional view taken along the axial center line of the gear shaft coupling 4 according to the first embodiment of the present invention.
2, 44 is an input shaft connected to the output end of the turbine 1 (see FIG. 1), 43a is an output shaft connected to the pinion gear 21 of the first stage reduction gear 2, and 42 is a connection shaft. The input side external teeth 44 formed on the input side of the connection shaft 42 mesh with the input side internal teeth 41 formed on the inner periphery of the end of the input shaft 44, and the output formed on the output side of the connection shaft 42 The side outer teeth 45 are engaged with the output side inner teeth 43 formed on the inner periphery of the end of the output shaft 43a, so that the rotational force is transmitted from the input shaft 44 to the output shaft 43a.

In the first embodiment of the present invention, in the gear shaft joint 4 having such a configuration, as shown in FIG.
The meshing pitch circle diameter D of the external teeth (input side external teeth 44 or output side external teeth 45) and internal teeth (input side internal teeth 41 or output side internal teeth 43) is
The transmission torque of the gear shaft coupling 4 is T,
The friction coefficient of the meshing tooth surface of the outer teeth and inner teeth is μ
The thrust load acting on the gear shaft coupling 4 is F,
When
D> (2 μT) / F (1)
It is set to become.

Further, when the gear shaft joint 4 as shown in FIG. 2 is manufactured, the external teeth (input side external teeth 44 or output side external teeth 45) and internal teeth (input side internal teeth 41 or output) of the gear shaft joint 4 are produced. The friction coefficient μ of the meshing tooth surface with the side inner teeth 43),
The meshing pitch circle diameter of the outer teeth and inner teeth is D,
The transmission torque of the gear shaft coupling 4 is T,
The thrust load acting on the gear shaft coupling 4 is F,
When
μ <(FD) / (2T) (2)
Set up to produce.

According to the first embodiment, the external teeth (input-side external teeth 44 or output-side external teeth 45) and internal teeth (input-side internal teeth 41 or output side) of the gear shaft coupling 4 as in the above formula (1). The meshing pitch circle diameter D with the inner teeth 43) and the thrust load F acting on the gear shaft joint 4 are in inverse proportion, and the meshing pitch circle diameter D is set to the allowable value (allowable thrust load) Fa of the thrust load F. The gear shaft coupling 4 is set to a pitch circle diameter D exceeding the corresponding pitch circle diameter D0 = (2 μT) / Fa,
Alternatively, by setting the friction coefficient μ of the meshing tooth surface of the gear shaft joint 4 between the external teeth and the internal teeth as described in the above (2), the meshing frictional force of the meshing tooth portion is suppressed to an allowable thrust load Fa or less. Accordingly, it is possible to prevent the occurrence of strong local tooth contact of the gear reduction device due to the thrust load accompanying the axial displacement of the shaft system of the gear reduction device.

FIG. 3 is a sectional view taken along the axial center line of the diaphragm shaft joint 5 according to the second embodiment of the present invention.
In the second embodiment, the diaphragm shaft joint 5 shown in FIG. 3 is used as the shaft joint 100 of the marine vessel propulsion apparatus shown in FIG.
3, 56 is an input shaft connected to the output end of the turbine 1 (see FIG. 1), and 57 is an output connected to the pinion gear 21 (see FIG. 1) of the first stage reduction gear 2. A shaft 55 is a connecting shaft.
Reference numeral 51 denotes an input side diaphragm. An outer peripheral portion which is an input side is fixed to the flange 52 of the input shaft 56, and an inner peripheral portion which is an output side is fixed to the input side flange 55 a of the connecting shaft 55. An output side diaphragm 53 has an inner peripheral portion on the input side fixed to the output side flange 55b of the connection shaft 55, and an outer peripheral portion on the output side fixed to the flange 54 of the output shaft 57.
The diaphragm shaft joint 5 is configured such that the axial rigidity of the diaphragms 51 and 53 is set so that the thrust load Fs generated by the axial rigidity of the diaphragm shaft joint 5 is less than or equal to the allowable thrust load F0. .

  According to the second embodiment, the axial stiffness (axial spring constant) of the diaphragms 51 and 53 of the diaphragm shaft joint 5 is determined by the thrust load Fs (Fs = axial direction) generated by the axial stiffness of the diaphragm shaft joint 5. If the rigidity x axial displacement of the shaft coupling) is set to be equal to or less than the allowable thrust load Fa (Fs ≦ Fa), the thrust load Fs can be absorbed by the axial rigidity of the diaphragms 51 and 53 in the diaphragm shaft coupling 5. Thus, it is possible to prevent the first stage reduction gear 2 and the second stage reduction gear 3 from generating strong local tooth contact due to the thrust load Fs.

FIG. 4 is a schematic diagram of a marine vessel propulsion apparatus according to a third embodiment of the present invention.
In the third embodiment, the shaft coupling 100 in FIG. 1 is connected to the output side of the gear shaft coupling 4 shown in FIG. 2 and the input side of the diaphragm shaft coupling 5 shown in FIG. is doing.
The connecting shaft 60 may be omitted, and the gear shaft joint 4 and the diaphragm shaft joint 5 may be directly connected, or conversely, the input of the gear shaft joint 4 may be input to the output side of the diaphragm shaft joint 5. The sides may be connected.

  According to the third embodiment, since the gear shaft joint 4 and the diaphragm shaft joint 5 are connected in series to receive the thrust load Fs, the axial rigidity can be accurately set in advance, and the thermal expansion of the shaft system is ensured. Even when the gear shaft joint 4 cannot completely absorb the thrust load due to the thermal elongation, the diaphragm shaft joint 5 can absorb the heat due to the thermal elongation. Thrust load can be absorbed reliably.

In the fourth embodiment of the present invention, the gear shaft coupling 4 is set to a pitch circle diameter (D> (2 μT) / F) as in the first embodiment, and the diaphragm shaft coupling 5 is The axial rigidity of the diaphragms 51 and 53 as in one embodiment, that is, (thrust load Fs = axial rigidity × axial displacement of the diaphragm joint 5) is set to be equal to or less than the allowable thrust load Fa (Fs ≦ Fa). .
According to this 4th Example, the absorption effect of the thrust load which combined the said gear shaft coupling 4 and the diaphragm shaft coupling 5 can be exhibited more reliably.

  In each of the above embodiments, the present invention is applied to a marine speed reducing device in which a shaft coupling is installed between a marine motor and a speed reducer that decelerates the rotation of the motor at a predetermined reduction ratio. The shaft coupling according to the present invention is not limited to this, and can be widely applied to shaft couplings interposed in gear-type increase / decrease devices.

  According to the present invention, axial displacement generated in the shaft system of the power transmission device including the shaft coupling between the input shaft and the output shaft of the shaft system in which the gear reduction device is interposed can be absorbed by the shaft coupling. Thus, it is possible to provide a power transmission device and a marine reduction gear provided with a shaft joint which prevents the gear reduction device from generating strong local tooth contact due to such axial displacement and avoids damage to the tooth portion.

It is a lineblock diagram of a vessel propulsion device to which the present invention is applied. It is sectional drawing which follows the axial center line | wire of the gear shaft coupling which concerns on 1st Example of this invention. It is sectional drawing which follows the axial center line of the diaphragm shaft coupling which concerns on 2nd Example of this invention. It is a schematic diagram of the ship propulsion device according to the third embodiment of the present invention. It is a schematic diagram which shows the local tooth-contact generation | occurrence | production state of the reduction gear by the thrust load in the marine reduction gear equipped with the gear shaft coupling as the shaft coupling.

Explanation of symbols

1 Turbine (motor)
2 First-stage reducer 3 Second-stage reducer 4 Gear shaft joint 5 Diaphragm shaft joint 8 Turbine side thrust bearing 21, 31 Pinion gear 22, 32 Wheel gear 33 Propeller shaft 34 Propeller 35 Propeller side thrust bearing 42 Connection shaft 44 , 56 Input shaft 45, 57 Output shaft 54 Flange 55 Connection shaft 100 Shaft joint D Pitch circle diameter

Claims (6)

In a power transmission device having a shaft coupling in which a shaft coupling is installed between an input shaft and an output shaft of a shaft system in which a gear reduction device is interposed, the shaft coupling includes an outer tooth and an inner tooth. The gear shaft coupling is configured to transmit a rotational force between the input shaft and the output shaft by meshing, and the gear shaft coupling has a meshing pitch circle diameter D between the external teeth and the internal teeth,
The transmission torque of the gear shaft joint is T,
The friction coefficient of the meshing tooth surface of the external teeth and internal teeth is μ,
The thrust load acting on the gear shaft joint is F,
When
D> (2 μT) / F
A power transmission device provided with a shaft coupling, characterized in that it is configured to be A method of manufacturing a power transmission device having a shaft coupling, in which a shaft coupling is installed between an input shaft and an output shaft of a shaft system in which a gear reduction device is interposed. And a gear shaft coupling that transmits the rotational force between the input shaft and the output shaft by meshing with the internal teeth, and the friction coefficient μ of the meshing tooth surface between the external teeth and the internal teeth in the gear shaft coupling is ,
The meshing pitch circle diameter of the outer teeth and inner teeth is D,
The transmission torque of the gear shaft joint is T,
The thrust load acting on the gear shaft joint is F,
Μ <(FD) / (2T)
The manufacturing method of the power transmission device provided with the shaft coupling characterized by setting so that it may become.   In a power transmission device having a shaft coupling, in which a shaft coupling is installed between an input shaft and an output shaft of a shaft system in which a gear reduction device is interposed, the shaft coupling includes the input shaft side and the output shaft. A diaphragm shaft joint having a diaphragm interposed therebetween, and the diaphragm shaft joint has an axial rigidity of the diaphragm, and a thrust load generated by the axial rigidity of the diaphragm shaft joint is less than an allowable thrust load. A power transmission device provided with a shaft coupling, characterized in that it is configured to be   In a power transmission device having a shaft coupling in which a shaft coupling is installed between an input shaft and an output shaft of a shaft system in which a gear reduction device is interposed, the shaft coupling includes an outer tooth and an inner tooth. A gear shaft coupling that transmits a rotational force between the input shaft and the output shaft by meshing, and a diaphragm shaft coupling in which a diaphragm is interposed between the input shaft side and the output shaft side are connected in series. A power transmission device comprising a shaft coupling.   5. The power transmission provided with the shaft coupling according to claim 4, wherein the gear shaft coupling comprises the gear shaft coupling according to claim 1, and the diaphragm shaft coupling comprises the diaphragm shaft coupling according to claim 3. apparatus. A marine speed reducer comprising a shaft coupling between a marine motor and a speed reducer that decelerates the rotation of the motor at a predetermined reduction ratio, wherein the shaft coupling according to claim 1 and claim 3 A marine speed reducer comprising any one of the shaft coupling according to claim 4, the shaft coupling according to claim 4, and the shaft coupling according to claim 5.

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