METHOD FOR DESIGNING A TRANSMISSION DEVICE, METHOD FOR MAKING THE TRANSMISSION DEVICE AND METHOD FOR MAKING A VARIABLE ACCELERATOR

Abstract

A method (S2) for designing a transmission device (10) for changing the rotational speed of a rotary drive force generated by an electrical device (50) configured to generate the rotary drive force and to transmit the rotary drive force to a driven target object (C), wherein the method (S2) comprises: a main body section layout step (S21) of the layout of a main body section (200) comprising an internal gear (17) having a plurality of teeth arranged annularly around an axis line (Ar), an internal gear carrier shaft (37) configured to extend in an axial direction around the axis line (Ar), and an internal gear carrier (31) supporting the internal gear (17) so that it is rotatable around the axis line (Ar), a gear unit section design step (S22) of designing a plurality of gear unit sections (300), each comprising a sun gear (11) configured to rotate about the axis line (Ar), a sun gear shaft (12) attached to the sun gear (11) and configured to extend axially around the axis line (Ar), and a planet gear (15) meshing with the sun gear (11), able to orbit the axis line (Ar) and rotate about a center line (Ap) thereof, and able to mesh with the internal gear (17) such that they have different gear ratios and the same outer diameter, and a gear unit section selection step (S23) of selecting a gear unit section (300) from the plurality of gear unit sections (300) that have been designed in the gear unit section design step (S22), wherein in the gear unit section design step (S22) for a case of a specification change of a required rotational speed of the target object to be driven (C) an inner diameter of the internal gear (17) is designed to be constant, a diameter of the sun gear (11) is changed to a value suitable for the required rotational speed, and a diameter of the planet gear (15) is changed according to the change in the diameter of the sun gear (11).

Description

[0001] The present invention relates to a method for designing or creating a transmission device, a method for manufacturing a transmission device and a method for manufacturing a speed-adjustable acceleration mechanism or an acceleration mechanism with variable speed or rotational velocity.

[0002] As a device that drives a lathe, such as a compressor, there is a speed-adjustable acceleration mechanism equipped with an electrical device that generates a rotational driving force, and a transmission device that modifies the rotational driving force generated by the electrical device and transmits it to the lathe. In the speed-adjustable acceleration mechanism, the gear ratio of the transmission device changes according to the required specifications. Therefore, it is necessary to rearrange the transmission device according to the required specifications.

[0003] For example, JP 4 368 013 B and DE 600 27 661 T2 describe a structure for changing the transmission ratio of a simple planetary roller used in a geared motor, according to its intended use as a structure that meets the required specifications. The geared motor described in JP 4 368 013 B and DE 600 27 661 T2 features a simple planetary roller mechanism with a ring roller, in which a rotating roller is in rolling contact with the outer circumference of a sun roller. In this geared motor, the transmission ratio can be flexibly changed to meet the required specifications by inserting the simple planetary roller mechanism between a transmission unit and a motor unit.

[0004] In a case where the transmission device used in the speed-adjusting acceleration mechanism has a planetary gear structure, the number of gears that need to be redesigned in order to produce a transmission device that meets the required gear ratio becomes extremely high.

[0005] However, because the number of gears requiring redesign becomes extremely high, a significant amount of design time is needed to manufacture a transmission device that meets the required specifications. Furthermore, if the specifications of the existing speed-variable-acceleration mechanism change, the transmission device itself must be replaced. Consequently, production time is extended and costs are increased. Therefore, it is desirable to obtain a transmission device that can accommodate different gear ratios while keeping production time and costs to a minimum.

[0006] DE 10 2014 210 868 A1 describes a device for power transmission with an input shaft, an output shaft, a superimposed transmission comprising at least one planetary gear with a ring gear, sun gear and a planet carrier with several planet gears, wherein the superimposed transmission connects the input shaft and the output shaft at least indirectly, and with at least one control device which is at least indirectly connected or connectable to one of the elements of the superimposed transmission, wherein at least one braking device is arranged at least indirectly on one of the elements of the superimposed transmission and / or on the output shaft for braking or stopping the output shaft.

[0007] DE 10 2014 225 738 A1 describes a method for operating a drive train that includes a planetary gear unit for driving a machine at variable speed. The method comprises starting up a main motor from standstill to a constant rated speed, starting up a governor machine from standstill to a predetermined speed, and driving an output shaft of the planetary gear unit at a speed resulting from a superposition of the speeds of the main motor and the governor machine, as defined by the planetary gear unit.

[0008] US 2014 / 0256502 A1 describes a planetary gear stage with a gearbox housing in which a ring gear, at least one planet gear, and a sun gear are rotatably arranged. The ring gear is connected via a drive lug to an element, in particular a sun gear shaft, of an upstream planetary gear stage and is rotatably mounted in the gearbox housing. To improve the robustness of the planetary gear, the ring gear is connected on the side opposite the drive lug to a ring gear support, which is mounted in the gearbox housing.

[0009] MÜLLER, Herbert W.: The planetary gears - design and versatile applications; Second revised and expanded edition, Berlin, Springer, 1998, pages 119-129 - ISBN 978-3-642-63698-1, describes the design of gears including those with variable speeds.

[0010] FISCHER, Robert [et al.]: The Gearbox Book, Vienna, Springer, 2012 (The Vehicle Drive), pages 219-221 - ISBN 978-3-7091-0876-5, describes the basic steps in the development of gearboxes.

[0011] LOOMAN, Johannes: Gearboxes - Fundamentals, Designs, Applications in Vehicles, Third revised and expanded edition, Springer, 1996, pages 31-40 - ISBN 978-3-540-89459-9 describes the fundamentals of the design of planetary gearboxes.

[0012] The present invention is intended to provide a method for designing a transmission device, a method for manufacturing a transmission device, and a method for manufacturing a speed-adjusting acceleration mechanism that can produce transmission devices with different transmission ratios while limiting manufacturing time and costs.

[0013] According to the present invention, claim 1 provides a method for designing a transmission device for changing the rotational speed of a rotary drive force generated by an electrical device configured to generate the rotary drive force and to transmit the rotary drive force to a driven target object, the method comprising: a main body section design step of designing a main body section comprising an internal gear with a plurality of teeth arranged annularly around an axis line, an internal gear carrier shaft configured to extend in an axial direction around the axis line, and an internal gear carrier supporting the internal gear so that it is rotatable around the axis line; a gear unit section design step of designing a plurality of gear unit sections, each comprising a sun gear configured toto rotate around the axis line, a sun gear shaft attached to the sun gear and designed to extend axially around the axis line, and a planet gear that can mesh with the sun gear, can orbit the axis line and rotate about a center line thereof, and mesh with the internal gear such that they have different gear ratios and the same outside diameter, and a gear unit section selection step of selecting a gear unit section from the plurality of gear unit sections designed in the gear unit section design step.

[0014] According to the design, a component with many gears, such as a planetary gear, a rotating gear, a sun gear, or a central gear, can be defined as a gear unit section. By designing a multitude of gear unit sections with the same external shape but different gear ratios, the design of the main body section can be standardized regardless of the required gear ratio. Therefore, design information for a multitude of transmission devices used in a compressor requiring different outputs or rotational speeds can be obtained without having to redesign the entire transmission device, which includes a point that needs to be connected to another device or similar component.

[0015] According to a preferred aspect of the present invention, in the gear unit section design step the transmission ratio is determined with a constant rotational speed of the planetary gear.

[0016] According to this embodiment, by designing a plurality of gear unit sections with the constant rotational speed of the planetary gear, it is not necessary to change the gear specification of the internal gear that transmits to the planetary gear, even in a case where the rotational speed of the driven target object changes. Therefore, even in a case where the rotational speed of the driven target object changes, the transmission device can be obtained that corresponds to the driven target object simply by exchanging the gear unit section, while limiting production time and costs. According to a preferred aspect of the present invention, a method for manufacturing a transmission device is provided.wherein the method comprises: a design information acquisition step of obtaining design information of the main body section and the gear unit section according to the method for designing a transmission device according to the invention, a main body section manufacturing step of manufacturing the main body section according to the design information of the main body section obtained in the design information acquisition step, a gear unit section manufacturing step of manufacturing the gear unit section according to the design information of the gear unit section obtained in the design information acquisition step, and a transmission device assembly step of attaching and assembling the gear unit section manufactured in the gear unit section manufacturing step to or with the main body section manufactured in the main body section manufacturing step.

[0017] According to this design, a transmission device can be manufactured according to a design information for a transmission device that is designed while production time and costs are limited.

[0018] According to a preferred aspect of the present invention, a method for manufacturing a speed-adjustable acceleration mechanism is provided, the method comprising: a transmission device acquisition step of obtaining the transmission device according to the method for manufacturing the transmission device according to the invention, an electrical device manufacturing step of manufacturing the electrical device comprising a constant-speed electric motor having a constant-speed rotor configured to be directly or indirectly connected to a constant-speed input shaft of the transmission device, and a speed-adjustable electric motor orcomprising a variable speed electric motor comprising a speed-adjusting rotor configured to be directly or indirectly connected to the speed-adjusting input shaft of the transmission device, and a transmission device mounting step of attaching the transmission device to the electrical device manufactured in the electrical device manufacturing step, such that the sun gear shaft forms an output shaft connected to a target object to be driven, and the inner gear carrier shaft forms the constant speed input shaft.

[0019] According to the design, the speed control acceleration mechanism can be manufactured in a short time by limiting the manufacturing time of the transmission device.

[0020] According to the present invention, transmission devices with different transmission ratios can be obtained while limiting production time and costs. Fig. Figure 1 is a cross-sectional view of a speed-adjusting acceleration mechanism of an embodiment according to the present invention. Fig. Figure 2 is a cross-sectional view of a transmission device of the embodiment according to the present invention. Fig. Figure 3 is a cross-sectional view of an electrical device of the embodiment according to the present invention. Fig. Figure 4 is a schematic view illustrating an embodiment of the transmission device according to the embodiment of the present invention. Fig. Figure 5 is a flowchart illustrating a method for manufacturing a speed-adjusting acceleration mechanism of the embodiment of the present invention.

[0021] In the following, a speed-adjusting acceleration mechanism or a variable-speed acceleration mechanism 1, which is manufactured by a method for manufacturing a speed-adjusting acceleration mechanism S1 of an embodiment of the present invention, is described in detail with reference to the drawings. As in Fig.As shown in Figure 1, the speed-adjusting acceleration mechanism 1 of the present embodiment comprises an electrical device 50 that generates a rotational driving force, and a transmission device 10 that changes the rotational speed of the rotational driving force generated by the electrical device 50 and transmits the rotational driving force to a driven target object. The speed-adjusting acceleration mechanism 1 can be used, for example, in a fluid-mechanical system such as a compressor system. The speed-adjusting acceleration mechanism 1 is connected to a compressor C, which serves as the driven target object.

[0022] The transmission device 10 is a transmission device with planetary gears. As in Fig.Figure 2 shows the transmission device 10 comprising a sun gear or central gear 11, a plurality of planet gears or rotating gears 15, an internal gear 17, a planet gear carrier 21, an internal gear carrier 31 and a transmission device housing 41.

[0023] The sun gear 11 rotates about an axis Ar extending in a horizontal direction. The transmission device housing 41 covers the sun gear 11, the plurality of planet gears 15, the internal gear 17, the planet gear carrier 21, and the internal gear carrier 31.

[0024] In the following, a direction in which the axis line Ar extends is called an axial direction, a side in the axial direction is an output side, and the opposite side of the output side is an input side. Furthermore, a radial direction around the axis line Ar is simply referred to as a radial direction.

[0025] The sun gear shaft 12 is attached to the sun gear 11. The sun gear shaft 12 has a column-like shape around the axis Ar. The sun gear shaft 12 extends from the sun gear 11 to the output side in the axial direction. A connecting flange 13 is formed at an output-side end section of the sun gear shaft 12. For example, a rotor of the compressor C, which serves as the driven target, is connected to the connecting flange 13.

[0026] The sun gear shaft 12 is supported by a sun gear bearing 42, which is arranged on the output side of the sun gear 11 such that it is rotatable about the axis line Ar. The sun gear bearing 42 is attached to the output side of an annular housing flange 45, which gradually widens outwards. The housing flange 45 can be attached to and removed from the transmission device housing 41.

[0027] The planet gear 15 is meshed with the sun gear 11. The planet gear 15 orbits the axis line Ar and rotates about a center line Ap of it.

[0028] The internal gear 17 meshes with the multitude of planetary gears 15. The internal gear 17 has a multitude of teeth arranged in a ring around the axis line Ar.

[0029] The planetary gear carrier 21 supports the multiple planetary gears in such a way that they can orbit the axis line Ar and rotate around the center line Ap of the planetary gear 15. The planetary gear carrier 21 comprises a planetary gear shaft 22, a planetary gear carrier main body 23, and a planetary gear carrier shaft 27.

[0030] The planet gear shaft 22 is provided for each of the plurality of planet gears 15. The planet gear shaft 22 penetrates the center line Ap of the planet gear 15 in the axial direction and supports the planet gear 15 so that it can rotate about the center line Ap.

[0031] The planet gear carrier main body 23 attaches mutual sections of the plurality of planet gear shafts 22. The planet gear carrier main body 23 comprises a planet gear output side arm section 24, a planet gear cylinder section 25 and a planet gear input side arm section 26.

[0032] The planet gear output sidearm section 24 extends radially outward from the plurality of planet gear shafts 22. The planet gear cylinder section 25 has a cylindrical shape around the axis line Ar. The planet gear cylinder section 25 extends from the radial outer end of the planet gear output sidearm section 24 to the input side. The planet gear cylinder section 25 is detachable from and attachable to the planet gear output sidearm section 24. The planet gear input sidearm section 26 extends radially inward from the output side end of the planet gear cylinder section 25.

[0033] The planetary gear carrier shaft 27 is attached to the planetary gear carrier main body 23. The planetary gear carrier shaft 27 extends axially around the axial line Ar. The planetary gear carrier shaft 27 comprises an output-side planetary gear carrier shaft 27o, extending from the planetary gear output side arm section 24 to the output side, and an input-side planetary gear carrier shaft 27i, extending from the planetary gear input side arm section 26 to the input side. Both the output-side planetary gear carrier shaft 27o and the input-side planetary gear carrier shaft 27i form a cylindrical shape around the axial line Ar.

[0034] The output side planetary gear carrier shaft 27o is supported by a first planetary gear carrier shaft bearing 43, which is arranged further on the output side than the planetary gear output side arm section 24, such that it is rotatable about the axis line Ar. The first planetary gear carrier bearing 43 is attached to the housing flange 45 from the side that is axially opposite the sun gear bearing 42. The sun gear shaft 12 is inserted into an inner circumferential side of the output side planetary gear carrier shaft 27o.

[0035] The input end of the planetary gear carrier shaft 27i is supported by a second planetary gear carrier bearing 44, which is arranged further on the input end than the planetary gear input side arm section 26, such that it is rotatable about the axis line Ar. The second planetary gear carrier bearing 44 is attached to the transmission device housing 41. An annular planetary gear flange 28, which gradually widens outwards, is formed at the input end of the input side of the planetary gear carrier shaft 27i.

[0036] The internal gear carrier 31 supports the internal gear 17 so that it can rotate about the axis line Ar. The internal gear carrier 31 comprises an internal gear carrier main body 33, to which the internal gear 17 is attached, and an internal gear carrier shaft 37, which is attached to the internal gear carrier main body 33 and extends axially around the axis line Ar.

[0037] The internal gear carrier main body 33 comprises an internal gear cylinder section 35, which forms a cylindrical shape around the axis line Ar and has the internal gear 17 attached to the inner circumferential side thereof, and an internal gear input side arm section 36, which extends radially inwards from the input side end of the internal gear cylinder section 35.

[0038] The internal gear carrier shaft 37, with a column-like shape around the axis Ar, is arranged on the input side of the sun gear shaft 12, which also has a column-like shape around the axis Ar. The internal gear input side arm section 36 of the internal gear carrier main body 33 is attached to the internal gear carrier shaft 37. The input side part of the internal gear carrier shaft 37 is inserted into the inner circumferential side of the cylindrical input side planetary gear carrier shaft 27i.

[0039] The transmission device 10 of the present embodiment is divided into a main body section 200 and a gear unit section 300. The gear unit section 300 can be attached to and removed from the main body section 200.

[0040] The main body section 200 comprises the internal gear 17, the internal gear carrier 31, a part of the planet gear carrier 21, and the transmission device housing 41. In particular, the main body section 200 of the present embodiment comprises the planet gear shaft 22, the planet gear cylinder section 25, the planet gear input side arm section 26, and the input side planet gear carrier shaft 27i as a part of the planet gear carrier 21.

[0041] The gear unit section 300 comprises the sun gear 11, the sun gear shaft 12, the planet gear 15, a part of the planet gear carrier 21, the first planet gear carrier bearing 43, the housing flange 45, and the sun gear bearing 42. In particular, the gear unit section 300 of the present embodiment has the planet gear output side arm section 24 and the output side planet gear carrier shaft 270 as a part of the planet gear carrier 21.

[0042] As in Fig. Figure 3 shows that the electrical device 50 comprises a constant speed electric motor 51, which rotates and drives the constant speed internal gear carrier shaft 37, and a speed-adjustable electric motor 71, which rotates and drives the input side planetary gear carrier shaft 27i at any speed.

[0043] The internal gear carrier shaft 37 is a constant-speed input shaft, or an input shaft with constant speed Ac, which is driven at a constant speed by a drive force of the constant-speed electric motor 51. The input side planetary gear carrier shaft 27i is a speed-adjustable input shaft, or an input shaft with variable speed Av, which is driven at any speed by the drive force of the speed-adjustable electric motor 71.

[0044] In the speed-adjusting acceleration mechanism 1, the speed of an output shaft Ao of the transmission device 10, which is connected to the target object to be driven, can be changed by changing the speed of the speed-adjusting electric motor 71.

[0045] The electrical device 50 is supported by a frame 90 by an electrical device support unit 50S. The transmission device 10 is supported by the frame 90.

[0046] The constant-speed electric motor 51 rotates and drives the internal gear carrier shaft 37 of the transmission device 10. The variable-speed electric motor 71 rotates and drives the input side planetary gear carrier shaft 27i of the transmission device 10. The electrical device 50 comprises a cooling fan 91 for cooling the constant-speed electric motor 51 and a fan cover 92 that covers the cooling fan 91.

[0047] In the present embodiment, the constant-speed electric motor 51 is, for example, a four-pole, three-phase induction electric motor. Furthermore, the variable-speed electric motor 71 is a six-pole, three-phase induction electric motor with more poles than the constant-speed electric motor 51. Moreover, the specifications of the constant-speed electric motor 51 and the variable-speed electric motor 71 are not limited thereto and can be suitably modified.

[0048] The constant-speed electric motor 51 comprises a constant-speed rotor 52, a constant-speed stator 66, and a constant-speed electric motor housing 61. The constant-speed electric motor 51 rotates and drives the constant-speed rotor 52 (internal gear 17) in a first direction R1 (see Fig. 4 positive direction) in a circumferential direction of the axis line Ar. When the constant speed rotor 52 rotates in the first direction R1, the internal gear carrier shaft 37 and the internal gear carrier 31 rotate in the first direction R1.

[0049] The constant-speed rotor 52 rotates around the axis Ar. The constant-speed rotor 52 is directly or indirectly connected to the internal gear carrier shaft 37, which is the constant-speed input shaft Ac of the transmission device 10. The constant-speed rotor 52 comprises a constant-speed rotor shaft 53, which forms a column-like shape around the axis Ar, and a conductor 56 attached to the outer circumference of the constant-speed rotor shaft 53. The cooling fan 91 is attached to the input end of the constant-speed rotor shaft 53.

[0050] The constant speed stator 66 is located on the outer circumferential side of the constant speed rotor 52. The constant speed stator 66 is located on the radial outside of the conductor 56 of the constant speed rotor 52. The constant speed stator 66 is formed from a plurality of coils.

[0051] The constant-speed electric motor housing 61 contains a constant-speed stator 66 mounted on its inner circumferential side. The constant-speed electric motor housing 61 comprises a constant-speed housing main body 62 and covers 63i and 63o. The constant-speed housing main body 62 has a cylindrical shape around the axis Ar. The constant-speed stator 66 is mounted on the inner circumferential side of the constant-speed housing main body 62. Covers 63i and 63o close or block both axial ends of the cylindrical constant-speed housing main body 62. Constant-speed rotor bearings 65i and 65o, which support the constant-speed rotor shaft 53 so that it can rotate around the axis Ar, are attached to each of the covers 63i and 63o.A multitude of openings 64, passing through in the axial direction, are formed in each of the covers 63i and 63o at positions further on the radial outside than the constant speed rotor bearing 65i.

[0052] The input end of the constant-speed rotor shaft 53 projects from the cover 63i on the input side of the constant-speed electric motor housing 61 to the input side. The cooling fan 91 is attached to the input end of the constant-speed rotor shaft 53.

[0053] When the constant-speed rotor 52 rotates, the cooling fan 91 also rotates integrally, i.e., as one unit with the constant-speed rotor 52. The fan cover 92 comprises a cylindrical cover body 93, which is arranged on the outer circumferential side of the cooling fan 91, and an air circulation plate 94, which is attached to the opening 64 on an inlet side of the cover body 93 and has a plurality of air holes formed therein. The fan cover 92 is attached to the cover 63i on the input side of the constant-speed electric motor housing 61.

[0054] The variable-speed electric motor 71 comprises a variable-speed rotor 72, a variable-speed stator 86, and a housing 81. The variable-speed electric motor 71 can drive the variable-speed rotor 72 (planetary gear carrier 21) in the first direction R1 along the circumferential axis Ar and in a second direction R2 (see Fig. 4) Rotate and drive in the direction opposite to the first direction R1. In other words, the speed-adjustable electric motor 71 can rotate forwards and backwards.

[0055] The variable speed electric motor 71 functions as a generator by rotating the variable speed rotor 72 in the first direction R1. A state in which the variable speed electric motor 71 functions as a generator is called generator mode. In other words, the variable speed rotor 72 of the variable speed electric motor 71 rotates in the first direction R1 in generator mode.

[0056] The variable speed electric motor 71 functions as an electric motor by rotating the variable speed rotor 72 in the second direction R2 opposite to the first direction R1. A state in which the variable speed electric motor 71 functions as an electric motor is referred to as an electric motor mode. In other words, the variable speed rotor 72 of the variable speed electric motor 71 rotates in the second direction R2 in the electric motor mode.

[0057] When the speed control rotor 72 rotates in the first direction R1, the planet gear carrier shaft 27 and the planet gear carrier 21 rotate in the first direction R1.

[0058] The speed-adjusting rotor 72 rotates about the axis line Ar. The speed-adjusting rotor 72 is directly or indirectly connected to the input side planetary gear carrier shaft 27i, which is the speed-adjusting input shaft or the variable-speed input shaft Av. The speed-adjusting rotor 72 comprises a speed-adjusting rotor shaft or a variable-speed rotor shaft 73 and a conductor 76, which is attached to the outer circumference of the speed-adjusting rotor shaft 73. The speed-adjusting rotor shaft 73 has a cylindrical shape about the axis line Ar and has a shaft insertion hole 74 that passes through it in the axial direction. An internal gear carrier shaft 37, which is the constant-speed input shaft Ac, is inserted into the shaft insertion hole 74 of the speed-adjusting rotor shaft 73. A ring-shaped speed control flange 73o, which widens radially outwards, is formed at the output side end of the speed control rotor shaft 73.

[0059] The speed-control stator 86 is arranged on the outer circumferential side of the speed-control rotor 72. The speed-control stator 86 is arranged on the radial outer side of the conductor 76 of the speed-control rotor 72. The speed-control stator 86 is formed from a plurality of coils.

[0060] The speed-controlling stator 86 is attached to the inner circumferential side of the speed-controlling electric motor housing 81. The speed-controlling electric motor housing 81 comprises a speed-controlling housing main body 82, an output-side cover 83o, and an input-side cover 83i. The speed-controlling housing main body 82 has a cylindrical shape around the axis Ar. The speed-controlling stator 86 is attached to the inner circumferential side of the speed-controlling housing main body 82. The output-side cover 83o closes or blocks the output end of the cylindrical speed-controlling housing main body 82. The input-side cover 83i is positioned further towards the input side than the speed-controlling stator 86 and is attached to the inner circumferential side of the speed-controlling housing main body 82.Speed-adjustable rotor bearings 85i and 85o, which support the speed-adjustable rotor shaft 73 to be rotatable about the axis line Ar, are provided on each of the covers 83i and 83o. A plurality of openings 84, which pass through in the axial direction, are formed in each of the covers 83i and 83o at positions further on the radial outside than the speed-adjustable rotor bearings 85i and 85o.

[0061] Due to the multitude of openings 84 formed in each of the covers 83i and 83o of the speed-adjustable electric motor housing 81 and the multitude of openings 64 formed in each of the covers 63i and 63o of the constant-speed electric motor housing 61, a space in the speed-adjustable electric motor housing 81 and a space in the constant-speed electric motor housing 61 are in communication or connected to each other.

[0062] Furthermore, in the speed-adjusting acceleration mechanism 1 of the present embodiment, the constant speed rotor 52, the speed-adjusting rotor 72 and the sun gear shaft 12 are arranged on the same axis line Ar.

[0063] The relationship between the number of teeth of each gear of the transmission device 10 and the rotational speed of each shaft of the transmission device 10 is determined with reference to Fig. 4 described.

[0064] The rotational speed of the sun gear shaft 12, which serves as the output shaft Ao, is ωs; the rotational speed of the internal gear carrier shaft 37, which serves as the constant speed input shaft AC, is ωi; and the rotational speed of the input side planetary gear carrier shaft 27i, which serves as the variable speed input shaft Av, is ωh. Furthermore, the number of teeth of the sun gear 11 is Zs and the number of teeth of the internal gear 17 is Zi.

[0065] In this case, the relationship between the number of teeth of each gear and the rotational speed of each shaft of the transmission device 10 can be expressed by the following expression (1). ωs / ωi=ωh / ωi−(1−ωh / ωi)×Zi / Zs

[0066] In a case where the constant-speed electric motor 51 is a four-pole induction electric motor and the energy supply frequency is 50 Hz, the speed ωi (rated speed) of the constant-speed rotor 52 (constant-speed input shaft Ac) is 1500 revolutions / min. Furthermore, in a case where the variable-speed electric motor 71 is a six-pole induction electric motor and the energy supply frequency is 50 Hz, the maximum speed ωh (rated speed) of the variable-speed rotor 72 (variable-speed input shaft Av) is 900 revolutions / min. Additionally, a ratio Zi / Zs of the number of teeth Zs of the sun gear 11 to the number of teeth Zi of the internal gear 17 is assumed to be four.

[0067] In this case, if the direction of rotation of the constant-speed rotor 52 (internal gear 17) is defined as forward rotation (rotation in the first direction) and the direction of rotation of the variable-speed rotor 72 (planetary gear carrier 21) is the highest speed (-900 rpm) in one direction (directions of the second direction) opposite to the rotation of the constant-speed rotor 52, the speed ωs of the sun gear shaft 12, which is the output shaft Ao, is -10,500 rpm. The speed (-10,500 rpm) is the highest speed of the sun gear shaft 12.

[0068] In other words, in the transmission device 10 of the present embodiment, the internal gear 17, which corresponds to the constant speed input shaft Ac, is rotated forward at +1500 revolutions / min and the planetary gear carrier 21, which corresponds to the speed-adjustable input shaft Av, is rotated at -900 revolutions / min and accordingly the speed ωs of the output shaft Ao becomes the highest speed.

[0069] Assuming that the variable speed range of the speed control input shaft is from -900 revolutions / min to +900 revolutions / min, when the speed of the speed control input shaft Av approaches +900 revolutions / min, the speed ωs of the output shaft Ao will be low.

[0070] If the direction of rotation of the constant speed rotor 52 is set to the forward direction of rotation and the direction of rotation of the speed adjustment rotor 72 is the lowest speed (-90 revolutions / min) in a direction opposite to the direction of rotation of the constant speed rotor 52, the speed of the sun gear shaft 12 will be -6450 revolutions / min.

[0071] In a case where the speed (rated speed) of the constant speed rotor 52 is +1500 revolutions / min and the speed of the variable speed rotor 72 in electric motor mode is controlled within the range of -300 to -900 revolutions / min by frequency control by the speed conversion unit 101, i.e. in a case where the frequency of the electrical energy to be supplied to the variable speed electric motor 71 is controlled within the range of 16.7 Hz to 50 Hz, the speed of the sun gear shaft 12, which is the output shaft Ao, can be controlled in the range of -7500 to -10,500 revolutions / min. The range is a speed-variable range of the sun gear shaft 12, which is the output shaft Ao, of the speed-adjusting acceleration mechanism 1, and the speed-adjusting acceleration mechanism 1 rotates the output shaft Ao within the speed-variable range.

[0072] Next, a method for manufacturing a speed-adjustment acceleration mechanism S1 of the present embodiment is described with reference to Fig.5. The method for manufacturing a speed-adjusting acceleration mechanism S1 is for manufacturing the speed-adjusting acceleration mechanism 1, which uses the transmission device 10 manufactured by a method for manufacturing a transmission device S3. The method for manufacturing a transmission device S3 serves to manufacture the transmission device 10 according to the design information after a design of the main body section 200 and the gear unit section 300 by a method for designing a transmission device S2. Therefore, the method for designing a transmission device S2, the method for manufacturing a transmission device S3, and the method for manufacturing a speed-adjusting acceleration mechanism S1 are described sequentially.

[0073] The method for designing a transmission device S2 of the present embodiment serves to design a main body section 200 and a plurality of gear unit sections 300 having different transmission ratios. The method for designing a transmission device S2 comprises a main body section design step S21, a gear unit section design step S22, and a gear unit section selection step S23.

[0074] In the main body section layout step S21, main body section 200 is laid out. Only one main body section 200 is laid out in the main body section layout step S21.

[0075] In gear unit section design step S22, the plurality of gear unit sections 300 are designed to have different gear ratios and the same outer diameter. In gear unit section design step S22, all of the plurality of gear unit sections 300 are designed to have the same outer diameter. In gear unit section design step S22, the gear ratio of all gear unit sections 300 is determined with a constant rotational speed of the planet gear 15. In gear unit section design step S22, the planet gears 15 of all gear unit sections 300 are designed to mesh with an internal gear 17.

[0076] In particular, as described in the following table, when three types of gear sections 300 are designed, an internal gear insertion center diameter DL, which is an inner diameter of the internal gear 17, and a planet gear center diameter Dv of the planet gear 15 are made constant. Under these conditions, the rotational speed ωs, a torque Ts, a center diameter ds, and a force fs acting on a tooth surface of the sun gear 11 are determined. From these values, the center diameter of the planet gear 15 is also determined. Table 1 Specifications Gear unit Gear unit Gear unit Section A Section B Section C Internal gear insertion center diameter DL Planetary gear center diameter Dv Sun gear speed ωsA ωsB ωsC torque TsA TsB Tsc Center diameter dsA dsB dsC Force acting on the tooth surface fsA fsB fsC

[0077] By designing the multitude of gear unit sections 300, as described in the table above, the design information for the gear unit sections 300, each corresponding to the different outputs and rotational speeds, can be obtained.

[0078] Furthermore, even if the output is the same and the rotational speed of the driven target object differs, the force acting on the tooth surface of the sun gear 11 remains constant. Specifically, the rotational speed of the driven target object, which has different rotational speeds ω1 and ω2, the torques are Ts1 and Ts2, and the diameters of the corresponding sun gears 11 are ds1 and ds2. Additionally, the forces acting on the tooth surface of the sun gear 11 are fs1 and fs2, respectively.

[0079] At this point, the following expression is defined with respect to an output W. W∝ωs1×Ts1=ωs2×Ts2

[0080] The following expression is defined with respect to the torques Ts1 and Ts2. Ts1∝fs1×ds1,Ts2∝fs2×ds2

[0081] When expression (3) is substituted into expression (2), ωs1×fs1×ds1=ωs2×fs2×ds2

[0082] If the internal gear insertion center diameter DL of the internal gear 17 is constant, since the rotational speed of a constant-speed motor, which is a main drive machine, is constant, then the inner diameter circumferential speed Vl of the internal gear 17 will also be constant. Consequently, the circumferential speed of the sun gear 11 is also the same as the inner diameter circumferential speed of the internal gear 17. Therefore, the following expression is established. V1∝ωs1×ds1=ωs2×ds2

[0083] When expression (5) is substituted into expression (4), ωs1×fs1×ds1=ωs1×fs2×ds1

[0084] Therefore, fs1 = fs2. In other words, even if the rotational speed of the driven target object changes, the force acting on the tooth surface of the sun gear 11 remains constant.

[0085] According to the above expression, even if the rotational speed of the driven object changes, the internal gear insertion center diameter DL remains constant, and the diameter of the sun gear 11 changes to a value suitable for the rotational speed (the diameter of the planet gear 15 changes accordingly), the force acting on the tooth surface of the sun gear 11 remains the same. Therefore, even if the rotational speed of the driven object changes, the specification change in the rotational speed of the driven object can be easily accommodated by replacing the gear unit section with the suitable gear unit section 300, without modifying the main body section 200 of the transmission device 10.

[0086] Next, in gear unit section selection step S23, a gear unit section 300 is selected from the multitude of gear unit sections 300 that were designed in gear unit section layout step S22. In gear unit section selection step S22, a gear unit section 300 is selected in accordance with the required output and rotational speed of the target object to be driven.

[0087] The method for manufacturing a transmission device S3 is for manufacturing the transmission device 10 according to the design information obtained by the method for designing a transmission device S2. The method for manufacturing a transmission device S3 of the present embodiment comprises a design information acquisition step S31, a main body section manufacturing step S32, a gear unit section manufacturing step S33, and a transmission device assembly step S34.

[0088] The layout information acquisition step S31 obtains the layout information for the main body section 200 and the gear unit section 300 according to the procedure for laying out a transmission device S2. Layout information acquisition step S31 obtains the layout information for the main body section 200 that was laid out in the main body section layout step S21. Layout information acquisition step S31 also obtains the layout information for the gear unit section 300 that was selected in the gear unit section selection step S23.

[0089] The main body section manufacturing step S32 is for manufacturing the main body section 200 according to the design information for the main body section 200, which was obtained in the design information acquisition step S31. In the main body section manufacturing step S32, the internal gear 17, the internal gear carrier 31, a part of the planetary gear carrier 21, and the transmission device housing 41 are each assembled to manufacture the main body section 200.

[0090] Gear unit section manufacturing step S33 is for manufacturing gear unit section 300 according to the design information for gear unit section 300, which was obtained in design information acquisition step S31. In gear unit section manufacturing step S33, the sun gear 11, the sun gear shaft 12, the planet gear 15, a portion of the planet gear carrier 21, the first planet gear carrier bearing 43, the housing flange 45, and the sun gear bearing 42 are assembled to manufacture gear unit section 300.

[0091] In transmission device assembly step S34, the gear unit section 300, which was manufactured in gear unit section manufacturing step S33, is attached to and assembled with the main body section 200, which was manufactured in main body section manufacturing step S32. In transmission device assembly step S34, the transmission device 10 is manufactured by inserting the already assembled gear unit section 300 into the already assembled main body section 200.

[0092] The method for manufacturing a speed-adjusting acceleration mechanism S1 is for manufacturing the speed-adjusting acceleration mechanism 1, which uses the transmission device 10 manufactured by the method for manufacturing a transmission device S3. The method for manufacturing a variable-speed certification mechanism S1 of the present embodiment comprises a transmission device acquisition step S11, an electrical device manufacturing step S12, and a transmission device installation step S13.

[0093] The transmission device acquisition step S11 obtains the transmission device 10 according to the method for manufacturing a transmission device S3. In other words, in the transmission device acquisition step S11, the transmission device 10 is obtained in a state in which a gear unit section 300 is inserted.

[0094] In electrical device manufacturing step S12, the electrical device 50, which comprises the constant-speed electric motor 51 and the variable-speed electric motor 71, is manufactured. In electrical device manufacturing step S12 of the present embodiment, the constant-speed electric motor 51 and the variable-speed electric motor 71 are manufactured separately. In electrical device manufacturing step S12, the integrated electrical device 50 is manufactured by combining or assembling the constant-speed electric motor 51 and the variable-speed electric motor 71, which are manufactured together.

[0095] In transmission device assembly step S13, the transmission device 10 is attached to the electrical device 50, which was manufactured in electrical device manufacturing step S12, such that the internal gear carrier shaft 37 forms the constant speed input shaft Ac and the planetary gear carrier shaft 27 forms the speed-adjustment input shaft Av. In transmission device assembly step S13, the internal gear carrier shaft 37 is connected to the constant speed rotor 52. In transmission device assembly step S13, the planetary gear carrier shaft 27 is connected to the speed-adjustment rotor 72. Accordingly, the speed-adjustment acceleration mechanism 1, in which the sun gear shaft 12 is configured as the output shaft Ao, which is connected to the compressor C, is manufactured.

[0096] According to the above-described method for designing a transmission device S2, a part with many gears, such as the planet gear 15 or the sun gear 11, can be designed as the gear unit section 300. By designing the plurality of gear unit sections 300 with the same external shape but with different transmission ratios, the design of the main body section 200 can be standardized, independent of the required gear ratio. In other words, without changing the design of the main body section 200, transmission devices 10 with different transmission ratios 10 can be obtained simply by designing the plurality of gear unit sections 300 that are part of the transmission device 10.Therefore, the design information for the multitude of transmission devices 10 adapted to the compressor C, which requires different outputs or speeds, can be obtained without redesigning the entire transmission device, including a location that needs to be connected to another device or similar. Accordingly, the transmission device 10 can be produced with different gear ratios, while limiting production time and costs.

[0097] By designing the multiple gear unit sections 300 with the constant rotational speed of the planetary gear 15, it is not necessary to readjust the gear specification of the internal gear 17, which transmits to the planetary gear carrier 15, even if the speed of the compressor C changes. Therefore, even if the speed of the compressor C changes, the transmission device 10 corresponding to the compressor C can be obtained simply by replacing the gear unit section 300, thus limiting production time and costs.

[0098] According to the method described above for manufacturing a transmission device S3, the transmission device 10 can be obtained according to the design information for the transmission device 10, while limiting production time and costs. Therefore, the transmission device 10 can be manufactured in a short time. Furthermore, the main body section 200 can be standardized, and the manufacturing costs of the main body section 200 can be limited. In addition, even with regard to the transmission device 10 already in use, changes to the compressor C, whose specifications such as output and speed have changed, can be easily accommodated by replacing the gear unit section 300.

[0099] According to the above-described method for manufacturing a speed-adjusting acceleration mechanism S1, the speed-adjusting acceleration mechanism 1 can be manufactured using the transmission device 10, which is produced in a short time. Therefore, the speed-adjusting acceleration mechanism 1 can be manufactured in a short time by limiting the manufacturing time of the transmission device 10.

[0100] Furthermore, in the embodiment described above, a four-pole three-phase induction electric motor is shown by way of example as the constant-speed electric motor 51, which is suitable for rotating the compressor C at high speed, and a six-pole three-phase induction electric motor is shown by way of example as the variable-speed electric motor 71, which is suitable for variably changing the speed of the compressor C within a certain range. However, in a case where it is not necessary to drive the target object at high speed, other types of electric motors than the constant-speed electric motor 51 or the variable-speed electric motor 71 can be used.

[0101] Furthermore, in the embodiment described above, the shaft insertion hole 74 is formed in the speed-adjusting rotor 72 and the constant-speed rotor 52 is inserted into the shaft insertion hole 74, but the shaft insertion hole 74 can be formed in the constant-speed rotor 52 and the speed-adjusting rotor 72 can be inserted into the shaft insertion hole 74.

[0102] Furthermore, in the embodiment described above, the constant-speed rotor 52, the speed-adjustable rotor 72, and the sun gear shaft 12 are arranged on the same axis line Ar, but the invention is not limited thereto. For example, the speed-adjustable electric motor 71 can be arranged such that the axis line Ar of the speed-adjustable rotor 72 is parallel to the axis line Ar of the constant-speed rotor 52 and is located in other positions.

[0103] Furthermore, in the transmission device 10 of the present embodiment, the planetary gear carrier input side arm section 26 can be provided with an idle gear. In this case, the speed-adjusting electric motor 71 can rotate the speed-adjusting rotor 72 (planetary gear carrier 21) in the same direction as the constant-speed electric motor 51, in the first direction R1, which is referred to as the normal direction.

[0104] According to the above described methods for designing the transmission device S2, transmission devices 10 with different gear ratios can be obtained while limiting production time and costs. Reference symbol list 1. Variable speed acceleration mechanism or variable speed acceleration mechanism 10 Transmission device Ar axis line 11 Sun gear or central gear 12 Sun gear shaft Ao issue wave 13 Connecting flange Ap Midline 15 Planetary gear or rotating gear 17 Internal gear 21 planetary gear carriers 22 Planetary gear shaft 23 Planetary gear carrier main body 24 Planetary gear output side arm section 25 Planetary gear cylinder section 26 Planetary gear input side arm section 27 Planetary gear carrier shaft 27o Output side planetary gear carrier shaft 27i Input side planetary gear carrier shaft Av speed adjustment input shaft or input shaft with variable speed 31 Internal gear carrier 33 Internal gear carrier main body 35 Internal gear cylinder section 36 Internal gear input side arm section 37 Internal gear carrier shaft AC constant speed input shaft 41 Transmission device housing 42 sun gear bearings 43 first planetary gear carrier bearing 44 second planetary gear carrier bearing 45 Housing flange 200 Main body section 300 gear unit section 50 Electrical device 51 Constant speed electric motor 52 Constant speed rotor 53 Constant speed rotor shaft 56 ladders 66 Constant speed stator 61 Constant speed electric motor housing 62 Constant speed housing main body 63i, 63o Lid or cover 64 Opening 65i, 65o constant speed rotor bearing 71 Variable speed electric motor 72 Speed-adjustable rotor 73 Speed-adjustable rotor shaft 74 Shaft insertion hole 73° speed control flange 76 leaders 86 Speed ​​control stator 81 Speed-adjustable electric motor housing 82 Transmission device housing main body 830 output-side ceiling 83i input-side ceiling 84 Opening 85i, 85o Speed-adjustable rotor bearings 91 cooling fans 92 Fan cover 93 Cover main body 94 Air circulation plate or recirculation plate 100 Speed ​​control device Sw1 first switch Sw2 second switch 120 control unit 10s transmission device command unit 50s electrical device support unit 90 frames C Compressor S1 Method for manufacturing a speed-adjustment acceleration mechanism S2 Method for designing a transmission device S21 Main body section layout step S22 Gear Unit Section Design Step S23 Gear Unit Section Selection Step S3 Method for manufacturing a transmission device S31 Design Information Obtaining Step S32 Main Body Section Manufacturing Step S33 Gear Unit Section Manufacturing Step S34 Transmission Device Assembly Step S11 Transfer Device Acquisition Steps S12 Electrical Device Manufacturing Step S13 Transfer Device Mounting Step

Claims

A method (S2) for designing a transmission device (10) for changing the rotational speed of a rotary drive force generated by an electrical device (50) configured to generate the rotary drive force and to transmit the rotary drive force to a driven target object (C), the method (S2) comprising: a main body section design step (S21) of designing a main body section (200) comprising an internal gear (17) having a plurality of teeth arranged annularly around an axis line (Ar), an internal gear carrier shaft (37) configured to extend in an axial direction around the axis line (Ar), and an internal gear carrier (31) supporting the internal gear (17) so that it is rotatable about the axis line (Ar); a gear unit section design step (S22) of designing a plurality of gear unit sections (300), each of which is a sun gear (11) which is designed,to rotate about the axis line (Ar), a sun gear shaft (12) which is attached to the sun gear (11) and designed to extend in the axial direction about the axis line (Ar), and a planet gear (15) which is engaged with the sun gear (11), can orbit the axis line (Ar) and can rotate about a center line (Ap) thereof, and can be brought into engagement with the internal gear (17) such that they have different transmission ratios and the same outer diameter, and a gear unit section selection step (S23) of selecting a gear unit section (300) from the plurality of gear unit sections (300) which have been designed in the gear unit section design step (S22),wherein in the gear unit section design step (S22) for a case of a specification change of a required rotational speed of the target object to be driven (C) an inner diameter of the internal gear (17) is designed to be constant, a diameter of the sun gear (11) is changed to a value suitable for the required rotational speed, and a diameter of the planet gear (15) is changed according to the change in the diameter of the sun gear (11). The method (S2) for designing a transmission device (10) according to claim 1, wherein in the gear unit section design step (S22) the transmission ratio is determined with a constant rotational speed of the planetary gear (15). A method (S3) for manufacturing a transmission device (10), comprising: a design information acquisition step (S31) of obtaining design information of the main body section (200) and the gear unit section (300) according to the method (S2) for designing a transmission device according to claim 1 or 2, a main body section manufacturing step (S32) of manufacturing the main body section (200) according to the design information of the main body section (200) obtained in the design information acquisition step (S31), a gear unit section manufacturing step (S33) of manufacturing the gear unit section (300) according to the design information of the gear unit section (300) obtained in the design information acquisition step (S31), and a transmission device assembly step (S34) of attaching and Assembling the gear unit section (300),which was manufactured in the gear unit section manufacturing step (S33), to or with the main body section (200) which was manufactured in the main body section manufacturing step (S32). A method (S1) for manufacturing a speed-adjustable acceleration mechanism comprising: a transmission device acquisition step (S11) of obtaining the transmission device (10) according to the method (S3) for manufacturing the transmission device according to claim 3, an electrical device manufacturing step (S12) of manufacturing the electrical device (50) comprising a constant-speed electric motor (51) comprising a constant-speed rotor (52) configured to be directly or indirectly connected to a constant-speed input shaft (Ac) of the transmission device (10), and a speed-adjustable electric motor orcomprising an electric motor with variable speed (71) comprising a speed-adjusting rotor (72) configured to be directly or indirectly connected to the speed-adjusting input shaft (Av) of the transmission device (10), and a transmission device mounting step (S13) of attaching the transmission device (10) to the electrical device (50) manufactured in the electrical device manufacturing step (S12), such that the sun gear shaft (12) forms an output shaft to be connected to a driven target object (C), and the inner gear carrier shaft (37) forms the constant speed input shaft (Ac).

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