JP2009216176A - Double-helical gear, assembling method therefor, and gear device for railroad vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make possible adoption of a double-helical gear as a small gear of a gear device for a railroad vehicle which has a large tooth ratio. <P>SOLUTION: An even number of helical gears 12a, 12b, of which the twist angle directions are opposite, are connected to each other by the double-helical gear 11 so that relative movement of the even number of helical gears 12a, 12b is made impossible. The double-helical gear 11 is provided with a helical gear 12a on one side, a helical gear 12b on the other side, a connection means, and a means of preventing both of the helical gears 12a, 12b from relatively moving. The helical gear 12a is constituted by integrally molding a tooth 12ab with part of the outer periphery of an axis 12aa, and the helical gear 12b is constituted by integrally molding a tooth 12bb with part of the outer periphery of a cylindrical-shaped axis 12ba to be integrated by inserting the ramaining part of the axis 12aa into the inside. The connection means connects both of the helical gears 12a, 12b to each other at the end of the axis 12aa of the helical gear 12a on one side in order to form a crest shape by each of the teeth 12aa, 12ba. Therefore, since assembly can be done only by fastening a male screw by a nut which is formed at the end of the axis of the helical gear on one side, the helical gear can be adopted as a small gear of a gear device having a large tooth ratio. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a spur gear used in, for example, a parallel cardan gear device, a method for assembling the spur gear, and a gear device for a railcar including the spur gear among the sprocket gear device. .

  In order to further increase the speed of railway vehicles, further improvement of comfort and reduction of environmental burden are required. As one of them, there is a reduction in noise generated when the gears of the gear device mesh with each other. The noise caused by this gear can be greatly reduced by the use of a blind gear.

By the way, as shown in FIG. 3, the helical gear 1 is fastened by bolts 1c and nuts 1d after manufacturing two helical gears 1a and 1b having opposite torsion angles as shown in FIG. (See, for example, FIGS. 2 and 3 of Patent Document 1).
JP 2004-332826 A

  Such a helical gear 1 in which two helical gears 1a and 1b having opposite torsional angles are fastened and integrated with a bolt 1c and a nut 1d has an outer diameter of the gear as shown in FIG. There is no problem if is somewhat large.

  However, in the case of a gear device having a large gear ratio, the outer diameter of the small gear becomes smaller. Therefore, as shown in FIG. 4, it is very difficult to form a fastening portion with bolts and nuts on the inner peripheral side of the teeth.

  In this case, as shown in FIG. 5, if the shaft diameter of one helical gear 1a is reduced, the dimension of the mounting portion of the bolt 1c can be secured. However, when the shaft diameter is reduced, the strength of the shaft is insufficient. Further, when the shaft diameter is reduced, the bearing 2 is also reduced in diameter, so that the basic rated load of the bearing 2 is reduced and the life is shortened, and the target strength and performance cannot be ensured.

  Therefore, it has been considered that it is difficult to employ a spur gear as a small gear in a railway vehicle gear device having a large gear ratio.

  The problem to be solved by the present invention is that in the conventional configuration, it is difficult to adopt a spur gear as a small gear of a gear device for a railway vehicle having a large gear ratio.

The helical gear of the present invention is
In order to be able to be adopted as a small gear of a railway vehicle gear device having a large gear ratio,
A helical gear that fastens even-numbered helical gears with opposite torsion angles so that they cannot move relative to each other,
One helical gear with teeth integrally formed on a part of the outer periphery of the central shaft;
The other helical gear in which teeth are integrally formed on a part of the outer periphery of a cylindrical shaft that is integrated by inserting the remainder of the central shaft inside;
Fastening means for fastening both helical gears at the end of the central axis of the one helical gear to form a chevron with respective teeth;
The main feature is that it has

  In the helical gear according to the present invention, the rest of the central shaft of one helical gear is integrally formed on a part of the outer periphery of the central shaft, and the tooth is integrally formed on a part of the outer periphery of the cylindrical shaft The other helical gear is assembled by being inserted inside the cylindrical shaft and integrated. This is the method of assembling the spur gear of the present invention.

  The helical gear of the present invention is fastened to one helical gear and the other helical gear at the end of the central shaft of one helical gear, so that it can also be used for small-diameter gears. it can.

  In addition, the remainder of the central shaft of one helical gear is integrated by inserting it inside the cylindrical shaft of the other helical gear, so that the shaft diameter is increased and the rigidity and strength of the shaft are increased. Can be secured. Further, by increasing the shaft diameter, the left and right bearings supporting the spur gear can be shared, and the allowable load of the bearing is increased, so that the bearing life can be improved.

  In the railway vehicle gear device of the present invention in which the spur gear of the present invention is used as a small gear, further reduction in vibration and noise can be achieved.

  The helical gear of the present invention can be assembled by simply fastening one helical gear and the other helical gear at the end of the central shaft of one helical gear. It can also be used for a small gear of a gear device having a large gear ratio.

  Further, the helical gear of the present invention can be integrated by inserting the remaining portion of the central shaft of one helical gear into the inside of the cylindrical shaft of the other helical gear, so that the shaft diameter can be increased. Therefore, the rigidity and strength of the shaft can be secured. In addition, by increasing the shaft diameter, the left and right bearings can be shared, the basic load rating of the bearing is increased, and the bearing life can be improved.

  In the railway vehicle gear device of the present invention in which the helical gear of the present invention is used as a small gear, it is possible to further reduce vibration and noise.

Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS.
FIG. 1 is an assembly view showing a cross-section of a blind gear of the present invention, and FIG. 2 is a perspective view and an exploded perspective view of the blind gear of the present invention.

  11 is a helical gear according to the present invention, which has two helical gears 12a and 12b whose directions of twist angles are opposite, for example, relative to each other at positions where the teeth 12ab and 12bb form a chevron. It is concluded so that it cannot move.

  In the one helical gear 12a, for example, the tooth 12ab is integrally formed on one side of the outer periphery of the center shaft 12aa, and a male screw 12ac is formed on the other end portion of the center shaft 12aa.

  The other helical gear 12b is provided with a cylindrical shaft 12ba into which the remaining portion (excluding the male screw 12ac) on the other side of the teeth 12ab of the central shaft 12aa is inserted, and the outer periphery of the shaft 12ba. The teeth 12bb are integrally formed on a part of the teeth.

  Further, in the example of FIGS. 1 and 2, an appropriate number (two in this example) of holes 12ad and 12bc are provided in the axial positions of both the helical gears 12a and 12b, respectively. .

  When inserting the remaining portion of the central shaft 12aa of one helical gear 12a into the cylindrical shaft 12ba of the other helical gear 12b, pins 13a and 13b are inserted into these holes 12ad and 12bc. Then, the nut 14 is screwed into the male screw 12ac and fastened.

  Thus, after assembling the helical gear 11 of the present invention, both helical gears 12a and 12b cannot move relative to each other. 2 is a washer with a tongue interposed between the nut 14 and the end face of the other helical gear 12b opposite to the helical gear 12a.

  In the helical gear 11 of the present invention described above, the central shaft 12aa of one helical gear 12a is integrated by being inserted into the cylindrical shaft 12ba of the other helical gear 12b. Even a small small gear can increase the shaft diameter and ensure the rigidity and strength of the shaft.

  Further, since the shaft diameter can be increased, the sizes of the bearings 2 on both sides supporting the spur gear 11 can be made common, the basic load rating of the bearing 2 is increased, and the life of the bearing 2 is improved. I can plan.

  Also, by screwing the nut 14 into the male screw 12ac formed at the end of the central shaft 12aa of one helical gear 12a, the one helical gear 12a and the other helical gear 12b are fastened, so that the small diameter It can also be used for other gears.

  In the gear device for a railway vehicle according to the present invention in which the spur gear 11 of the present invention is used as a small gear, further reduction in vibration and noise can be achieved.

  The present invention is not limited to the above example, and it goes without saying that the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

  For example, in the example of FIGS. 1 and 2, one helical gear 12a and the other helical gear 12b are fastened, and a nut 14 is screwed into a male screw 12ac formed at the end of one helical gear 12a. Although what is done in is shown, it is not limited to this. For example, after one helical gear 12a is inserted into the other helical gear 12b, a fixing part may be inserted.

  Further, in the above example, both the helical gears 12a and 12b are pinned to the helical gears 12a and 12b in order to prevent the positional alignment during the assembly of the helical gears 12a and 12b, the positional deviation during screw connection, and the positional deviation during actual operation. Although a combination of 13a and 13b is shown, the number of pins is not limited to two. One or three or more may be used. Further, as long as the alignment can be performed and the positional deviation can be prevented, a pin does not need to be interposed.

  The present invention described above can be applied to any gear device, not limited to a gear device for a railway vehicle.

It is an assembly drawing which shows a cross section of the spur gear of the present invention. (A) is a perspective view of the spur gear of this invention, (b) is an exploded perspective view similarly. It is an assembly drawing which shows a conventional cross-section gear section partially. It is a figure explaining that it is difficult to apply the spur gear of the structure of FIG. 3 to the small gear in the case of a gear apparatus with a large gear ratio. When applied to a small gear in the case of a gear device having a large gear ratio, it is an assembly drawing showing a partial cross-section of a spur gear in which the shaft diameter is reduced to ensure the dimensions of the bolt mounting portion.

Explanation of symbols

11 helical gear 12a helical gear 12aa central shaft 12ab tooth 12ac male screw 12ad hole 12b helical gear 12ba cylindrical shaft 12bb tooth 12bc hole 13a, 13b pin 14 nut

Claims (6)

A helical gear that fastens even-numbered helical gears with opposite torsion angles so that they cannot move relative to each other,
One helical gear with teeth integrally formed on a part of the outer periphery of the central shaft;
The other helical gear in which teeth are integrally formed on a part of the outer periphery of a cylindrical shaft that is integrated by inserting the remainder of the central shaft inside;
Fastening means for fastening both helical gears at the end of the central axis of the one helical gear to form a chevron with respective teeth;
A spear gear characterized by comprising The fastening means includes
A male screw formed at the end of the central shaft of the one helical gear;
A nut screwed into the male screw;
The helical gear according to claim 1, comprising:   The helical gear according to claim 1 or 2, further comprising means for preventing relative movement of both of the helical gears. The means for preventing the relative movement is:
An appropriate number of holes respectively formed at opposite positions in the axial direction of both of the helical gears;
Pins inserted into these appropriate numbers of holes,
The helical gear according to claim 3, comprising: A helical gear assembly method for fastening even numbered helical gears having opposite directions of torsion angles so that they cannot be moved relative to each other.
The remaining portion of the central shaft of one helical gear in which teeth are integrally formed on a part of the outer periphery of the central shaft,
A helical gear assembly method, wherein the other helical gear having teeth integrally formed on a part of the outer periphery of a cylindrical shaft is inserted and integrated inside the cylindrical shaft.   5. A railway vehicle gear device, wherein the helical gear according to claim 1 is used as a small gear.

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