JPH0214679Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a spindle drive power generation device having a differential planetary gear mechanism that transmits driving force to a generator at constant rotation speed.

[Prior Art] As shown in Fig. 3, a main shaft drive power generator has a main shaft 1 that is rotationally driven by an engine or the like and transmits the driving force.
A part of the driving force is taken out by a gear mechanism 2 or the like and applied to a driven shaft 3 to drive auxiliary machinery 4 connected thereto. According to this main shaft drive power generator, it is possible to eliminate or reduce the need for a generator, etc., which was conventionally required for an electric motor to drive auxiliary equipment.
It is possible to simplify equipment and reduce running costs.

For example, in recent years, some of the driving force has been extracted from the main shaft 1 of a marine engine and used as an auxiliary machine, such as a generator 5.
etc., has been specified.

In this case, the generator 5 needs to be rotated at a constant speed in order to obtain a constant frequency, whereas in a marine engine, the rotation speed is not constant and fluctuates frequently, so the driven shaft 3 and the main shaft 1 A differential planetary gear mechanism 6, which is a constant speed means, is provided between the two.

This differential planetary gear mechanism 6 includes a sun gear 12 connected to the driven shaft 3 via an intermediate shaft 22, a planetary gear 11 meshed with the sun gear 12, and an internal gear 8 meshed with the planetary gear 11. A differential gear 10 is configured to mesh with a gear 9 formed on the outer periphery of an internal gear 8. This differential gear 10 increases or decreases the revolution speed of the planetary gear 11 that transmits the driving force while undergoing rotation speed fluctuations, thereby making the output rotation speed of the sun gear 12 constant. It is driven in reverse. And this differential gear 10
is rotated by a hydraulic pump gear 14 rotated by rotational driving force from the main shaft 1 and a hydraulic motor 17 driven by a hydraulic pump 16.

[Problem to be solved by the invention] By the way, in the case of the conventional main shaft drive generator,
I had the following problem.

A considerable driving torque is applied to the hydraulic pump gear 14 from the main shaft 1, and a large meshing force acts on the hydraulic pump gear 14. On the other hand, the hydraulic pump 16 is not structured to tolerate excessive external forces such as meshing force. Therefore, as shown in FIG. 4, if the hydraulic pump 16 and the hydraulic pump gear 14 are directly and fixedly connected by the transmission shaft 15, an excessive load is applied to the hydraulic pump 16, and the pump housing 18, which is a fixed system, is The hydraulic pump 16 provided therein, the bearing 19 supporting the transmission shaft 15, etc. become unusable in a short period of time, making it impossible to ensure the reliability and durability of the control mechanism.

Therefore, as a general measure, as shown in Figure 5,
Between the hydraulic pump gear 14 and the hydraulic pump 16,
It is conceivable to provide a flexible joint 20 such as a rubber coupling to relieve and absorb the meshing force.

However, in a main shaft drive power generator, the differential planetary gear mechanism 6 must be controlled immediately in response to fluctuations in the rotation speed of the main shaft 1, but the flexible joint 20
The problem is that the provision of the rotor impedes rotational speed transmission due to its buffering and absorbing effect, resulting in control delays and the like, making it impossible to obtain constant speed rotation.

The present invention was devised in view of the above-mentioned problems, and its purpose is to alleviate and absorb the meshing force, suppress interference with rotational speed transmission, and improve the durability of the control mechanism and the reliability of control operations. An object of the present invention is to provide a spindle drive power generation device that can ensure quick response.

[Means for Solving the Problems] The present invention provides a differential planetary gear mechanism whose operation is controlled by a differential gear, and which extracts part of the driving force from the main shaft that transmits the driving force at a constant rotation speed to drive a generator. This is an improved spindle drive power generation device with
A gear shaft is formed which has an input gear rotatably driven by a main shaft and is supported on a fixed system on both sides of the input gear, and a residual portion is formed between the gear shaft and the input shaft of the drive means for actuating the differential gear. In addition to providing a flexible transmission shaft that buffers the meshing reaction force, the transmission shaft and gear shaft are connected by a shear pin that is cut by excessive torque, and when the shear pin is cut, the transmission shaft It is equipped with an emergency bearing that supports the

[Operation] With the above configuration, the gear shaft causes the fixed system to receive most of the meshing reaction force from the main shaft, transmits the rotational driving force to the drive means, and differentially controls the differential gear. The transmission shaft buffers the residual meshing reaction force, and when excessive torque occurs, the shear pin cuts off the edge of the gear shaft, and the transmission shaft is pivotally supported by the emergency bearing.

[Examples] Examples of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the main shaft drive power generator according to the present invention, and shows the main parts of the differential planetary gear mechanism. In the figure, the same reference numerals are given to the same configurations as in the prior art.

21 is a gear for extracting a part of the driving force from the main shaft, and the driving force inputted from this gear 21 is transmitted to the sun gear 12 by rotation and revolution within the internal gear 8 of the planetary gear 11. An output is made from the sun gear 12 to a driven shaft, and an external gear 9 is formed on the outer periphery of the internal gear 8, and a differential gear 10 is meshed with the external gear 9.

The gear 21 is integrally provided with an output gear 23, which is driven to rotate in synchronization with the rotation of the main shaft applied to the planetary frame 24, and also functions as a speed increasing gear that reduces and transmits the driving torque. This output gear 23
A hydraulic pump gear 14, which is an input gear, is meshed with the input gear via an idle gear 25.

The hydraulic pump gear 14 transmits the rotation of the main shaft to a hydraulic pump 16, which is a driving means, and inputs its driving force to drive and control the differential gear 10 by varying the rotational speed. This hydraulic pump gear 14 has a gear shaft 26 integrally extended in its axial direction.
is formed, and both ends of this gear shaft 26 are fixedly supported by a casing 27, which is a fixed system, via bearings 28 and 29. Most of the large meshing force between the gears caused by the large driving force from the main shaft is applied to and received by the casing 27 from bearings 28 and 29 that fixedly support the gear shaft 26 at both ends. Further, the bearings 28 and 29 are supported on both sides, and can receive the meshing reaction force in a well-balanced manner. Further, the hydraulic pump gear 14 and the gear shaft 26 are formed into a hollow shaft shape, and
A flange 30 is fixed to one end.

A hydraulic pump 16 for supplying and discharging control hydraulic pressure to and from the hydraulic motor is provided on the side opposite to this one end, and one end of a transmission shaft 15, which is a feature of the present invention, is fixedly connected to its input shaft 31. The transmission shaft 15 is coaxially inserted into a hollow portion inside the hydraulic pump gear 14, and the other end thereof extends outside the flange 30. The transmission shaft 15 is formed to have flexibility so as to buffer the residual meshing reaction force. In order to impart flexibility, measures such as making the shaft diameter smaller than the shaft length or setting the shaft length longer than the shaft diameter are taken from the relationship between the shaft length and shaft diameter. It is also possible to form a hollow part inside the shaft or change the material. However, since the transmission shaft 15 transmits not only the rotation speed but also the pump driving force to the hydraulic pump 16, a certain degree of torsional rigidity etc. is ensured, and the possibilities of the transmission shaft 15 are determined by taking the above points into consideration. Flexibility is achieved. Furthermore, by ensuring this level of torsional rigidity, rotational speed transmission is also performed accurately.

As shown in FIG. 2, the flange 3 of the transmission shaft 15
A flange 32 facing the flange 30 is formed at the other end extending outward. These flanges 30 and 32 are connected to each other by shear pins 33 disposed at appropriate intervals along their circumferential direction.

The shear pin 33 has a portion located between the flanges 30 and 32 that has a sufficiently smaller cross-sectional area than the other portions, and when a relative speed difference occurs between the flanges 30 and 32, for example due to damage to the pump 16, the transmission shaft 15 It functions to protect the gear train from the hydraulic pump gear 14 to the output gear 23 side by shearing failure (cutting) due to excessive torque such as when the hydraulic pump gear 14 is stopped.

Further, coil springs 34 are provided between the flanges 30 and 32 at appropriate intervals along their circumferential direction.
is installed. These coil springs 34
is provided with one end fixed to the flange 30 of the gear shaft 26 and the other end locked to a block 35 slidably inserted through the flange 32 of the transmission shaft 15, and when the shear pin 33 is cut, The broken surfaces of these shear pins 33 are prevented from coming into contact with each other.

Further, the transmission shaft 15 is formed with a support shaft portion 36 that extends further axially outward from the flange 32. On the other hand, the casing 27 has this support shaft portion 36.
A support block 37 is provided which surrounds the block at a predetermined interval. This support block 37 is formed with an insertion hole 38 along the axial direction of the support shaft portion 36.
A support shaft portion 36 is inserted into the interior thereof. A bearing member 39 is provided in this insertion hole 38 at a predetermined distance from the support shaft portion 36, and is not engaged when the hydraulic pump gear 14 and the transmission shaft 15 are connected via the shear pin 33. Without,
When the shear pin 33 is cut, the transmission shaft 15, which loses support from the hydraulic pump gear 14 and is displaced in the direction of gravity, is supported by its support shaft portion 36, and the transmission shaft 15
Interference between the gear shaft 26 and the gear shaft 26 in the radial direction is restricted. That is, these support blocks 3
7. The insertion hole 38 and the bearing member 39 constitute an emergency bearing that supports the transmission shaft 15 in an emergency. At this time, in order to prevent the transmission shaft 15 from moving in the axial direction and interfering with the gear shaft 26, a support block 37 is provided as shown by the dashed line in the figure.
Alternatively, the bearing member 39 may be provided with a movement limiting device.

Next, the operation of the present invention will be described.

The driving force taken out from the main shaft via the gear 21 is transmitted to the planetary gear 11 and the sun gear 12 via the planetary frame 24, and part of it is transmitted to the output gear 2.
3 to the hydraulic pump gear 14 together with the rotational speed. The hydraulic pump gear 14 transmits its rotation speed and driving force to the hydraulic pump 16 via the transmission shaft 15, and the hydraulic pump 16 uses the driving force to control the operation of the differential gear 10 according to the rotation speed as a control signal. , output from the sun gear 12 to the driven shaft as driving force for constant speed rotation.

During this transmission, the output gear 23, the idle gear 2
The main shaft driving force applied to the hydraulic pump gear 14 via the hydraulic pump gear 14 is large.
A large meshing force acts on the In contrast, in the present invention, the hydraulic pump gear 14 is fixedly supported at both ends by bearings 28, 29, and most of the meshing reaction force can be received by the casing 27, which is a fixed system. Therefore, an excessive load on the pump 16 connected to the hydraulic pump gear 14 can be prevented.

In addition, by flexibly configuring the transmission shaft 15 that connects the hydraulic pump gear 14 and the hydraulic pump 16, the meshing reaction force can be further buffered, and the transmission shaft 15 that connects the hydraulic pump gear 14 and the hydraulic pump 16 can be properly connected. Excessive cantilever load can be reduced and good driving force transmission can be achieved. Therefore, flexible joints etc. can be abolished,
Control defects caused by the equipment can be resolved. Furthermore, these flexible joints require maintenance because they receive large torques, but by providing the transmission shaft 15, such work can be eliminated.

Also, the transmission shaft 15 and the gear shaft 26 are connected to the shear pin 3
3, and the transmission shaft 15 is equipped with an emergency bearing, so that when excessive torque is generated, an adverse effect on the gear train is prevented, thereby contributing to improving the durability of the device.

Furthermore, in this embodiment, the transmission shaft 1 is formed with a predetermined length in order to exhibit considerable flexibility.
5 is housed inside the hydraulic pump gear 14, the axial length of the transmission shaft 15 can be substantially omitted, and the device can be made more compact.

[Effects of the Invention] In summary, the present invention provides the following excellent effects.

A gear shaft is formed with bearings on both sides of the input gear, a flexible transmission shaft is provided between the gear shaft and the input shaft, and the transmission shaft and the gear shaft are connected with a shear pin. Equipped with an emergency bearing, it is possible to prevent excessive load from being applied to the drive means.
The durability of the device and the reliability of control operations can be ensured.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a preferred embodiment of the present invention, FIG. 2 is an enlarged sectional view of the main part in FIG. 1, and FIG.
The figure is a schematic perspective view showing the entire main shaft drive generator.
4 and 5 are side sectional views showing a conventional example. In the figure, 1 is the main shaft, 5 is a generator, 6 is a differential planetary gear mechanism, 10 is a differential gear, 14 is a hydraulic pump gear that is an input gear, 15 is a transmission shaft, 16 is a hydraulic pump that is a driving means, and 27 is a hydraulic pump gear that is an input gear. Fixed barrel casing, 3
3 is a shear pin.

Claims (1)

[Scope of utility model registration request] In a main shaft drive power generation device having a differential planetary gear mechanism whose operation is controlled by a differential gear and which extracts a part of the driving force from the main shaft transmitting the driving force at a constant speed rotation and drives the generator, the main shaft transmits the driving force. forming a gear shaft comprising a rotationally driven input gear and bearing on a stationary system on both sides of the input gear; residual meshing between the gear shaft and the input shaft of the drive means for actuating the differential gear; A flexible transmission shaft is provided to buffer the reaction force, and the transmission shaft and the gear shaft are connected by a shear pin that is cut by excessive torque, so that when the shear pin is cut, the transmission shaft A main shaft drive power generation device characterized by being provided with an emergency bearing that supports the.