JP4494229B2 - Orthogonal helical worm reducer and series of the reducer - Google Patents

Description

  The present invention relates to a speed reducer that reduces a rotational speed from an input shaft connected to a motor to a lower rotational speed and transmits the reduced speed to an output shaft. And a series of reduction gears.

  Motors are so popular in various fields that modern life cannot be achieved without motors, and reduction gears are widely used to convey the rotational force of motors in various forms of movement. Among them, the worm gear mechanism is compact and has a large reduction ratio, and is used in various fields because of its quietness.

However, a reduction gear having a worm gear has a structural requirement that the worm axial dimension management or assembly management with respect to the worm gear must be strictly performed. For this reason, even when changing the reduction ratio, which seems to be relatively easy, due to structural problems, the manufacturer's skilled workers go to the customer's factory for repair, or the manufacturer's side collects, modifies, and reinstalls the reducer. There was a problem such as having to do.

  In light of these problems, there has been a demand for the development of an apparatus that can separate and connect a two-stage reduction gear provided in one casing to the first casing and the second casing. Therefore, the assembly of the worm gear mechanism that requires skill and the assembly of the parallel shaft gear mechanism that does not particularly require these are separated to facilitate the work.

  FIG. 5 is a cross-sectional view of such a worm geared motor disclosed in Japanese Patent Laid-Open No. 2002-323094. This worm geared motor is obtained by integrating a motor M2 and a two-stage worm reduction gear G2.

The worm reducer G2 is a first-stage reduction part 400 of a parallel shaft (helical) gear mechanism.
And a second-stage reduction part 420 of the worm gear mechanism.

  The casing 600 can be separated into a first casing 620 and a second casing 640. The first casing 620 accommodates a first-stage reduction part 400, and the second casing 640 accommodates a second-stage reduction part 420. A helical and worm gear box is formed by connecting the first and second casings.

  The rotation of the motor shaft 280 of the motor M2 becomes the rotation of the input shaft 340 of the first stage reduction unit 400 of the two-stage worm speed reducer G2 as it is, and the first stage deceleration is performed by the meshing of the helical pinion 440 and the helical gear 460. Is called.

  The rotation of the helical gear 460 is transmitted to the worm shaft 480 of the second-stage reduction unit 420, and the rotation direction is changed by 90 ° by the engagement of the worm 500 and the worm gear 520, and the second-stage deceleration is performed. The rotation of the worm gear 520 is directly transmitted to the input shaft of the counterpart machine via the output shaft 540.

  The installation and adjustment of the worm shaft 480 often requires appropriate equipment, and is difficult to install and adjust in the field, and is generally performed in a factory on the manufacturer side.

  FIG. 6 schematically shows the above-described conventional technique. In the worm reducer G2, the gear box casing can be separated and connected to the first casing 620 including the first-stage reduction portion and the second casing 640 including the second-stage reduction portion. These two casings are connected to form a “helical, worm” gearbox. 60 and M2 in FIG. 6 respectively indicate a separation / connection part and a motor.

  By the way, in the technique before the said Unexamined-Japanese-Patent No. 2002-323094, since the casing was a single body, it was necessary for the skilled worker to perform the assembly work from the beginning to the end including the assembly by the side of the parallel shaft gear mechanism. . However, in Japanese Patent Laid-Open No. 2002-323094, as described above, the casing 600 can be divided into the casings 620 and 640, so that a skilled worker only has to assemble only the second casing 640 side.

  As a result of dividing the casing as described above, the motor M2 and the first casing 620 can be removed while leaving the second casing 640, and gear replacement and maintenance for changing the reduction ratio can be performed more easily than before. Became. In addition, it is possible to replace only the motor M2 while leaving the first and second casings.

However, in the conventional speed reducer disclosed in Japanese Patent Laid-Open No. 2002-323094, in fact, when the gear ratio is changed, a skilled worker on the manufacturer side goes to the customer's factory for repair, or the speed reducer is collected on the manufacturer side. There were still problems that had to be remodeled and re-installed.
This is because the two-stage worm speed reducer that can be separated and connected to the first and second casings described above requires the disassembly of the gearbox when the speed ratio is changed, which is more work than the conventional integral casing. Although it is relatively easy, it is indispensable to assemble the helical gear in the parallel shaft gear mechanism, and this requires a certain amount of knowledge and experience. Further, since the lubricating oil flows out when performing this recombination work, the problem that it is necessary to replace the troublesome lubricating oil is inevitable.

According to the present invention, the worm gear unit from which the worm shaft protrudes and the multistage helical gear unit with a motor from which the output shaft protrudes are connected by inserting one of the shafts into the other, and each case has A helical worm reducer with an orthogonal motor that is in-row coupled at opposing flanges,
The opposing flanges are fixed with fastening bolts in the axial direction,
The connection between the shafts is a connection by a key and a key groove,
The above-mentioned problems have been solved by a helical worm speed reducer with an orthogonal motor, wherein both the gear units are sealed with oil seals at the opposing flanges.
It is to be noted that the second aspect of the present invention is a helical worm reduction gear with orthogonal motor, in which a group of worm gear units having a plurality of reduction ratios and a group of multi-stage helical gear units with a motor having a plurality of reduction ratios can be combined. The target series.

  In the present invention, since the two gear units are directly connected to each other by in-row coupling, the size can be reduced as compared with the conventional apparatus. The worm gear unit has a protruding worm shaft and flange (inlay processed product), and the output shaft of the corresponding helical gear unit (with motor) is inserted directly into the worm shaft, and is orthogonally connected by flange connection and fixation with each other. A compact, high gear ratio type gear unit motor can be manufactured.

In addition, by assembling each gear unit in advance, it becomes possible to respond quickly to the final assembly of the product after determining the combination (reduction ratio, etc.) according to the specific specification requirements, and excellent assembly Can demonstrate its sexuality. At the same time, by combining a group of worm gear units with a wide reduction ratio and a group of multi-stage helical gear units with motors with a wide reduction ratio, it is possible to provide a reduction gear series with a wide reduction ratio.
Since the operation of connecting the gear units is performed by connecting the flanges with the inlay of the flanges, the number of assembling steps is significantly reduced compared to the conventional product. Moreover, since this assembly work does not require special assembly skills, it can be performed by a general worker without assigning skilled workers. In addition, it is possible to easily cope with specification changes such as a change in reduction ratio. As a result, it is possible to cope with a short-term delivery of the product to the customer, thereby improving human efficiency and reducing the cost.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a specific embodiment of the present invention, which includes a left side low speed worm gear unit 10 and a right side high speed side helical gear unit (including a motor) 20.
The worm gear unit 10 and the helical gear unit 20 are connected to each other by a flange A on the worm gear unit 10 side and a flange B on the helical gear unit 20 side in the separation connecting portion 60 and fixed in the axial direction by fastening bolts 62.

The helical gear unit 20 includes a motor M, a speed reduction unit 50, a flange B, and an oil seal 29 housed in a case 40. The speed reduction unit 50 includes a motor output shaft 23, a pinion 24 at the tip of the output shaft, an intermediate gear 25, an intermediate gear pinion 26, and an output gear 28. The helical unit output shaft 27 projects outward.
The helical gear unit 20 has a structure sealed by a helical gear unit side oil seal 29.

  On the other hand, in the low speed side worm gear unit 10, the worm shaft 11 including the worm gear 12 and the output shaft 30 are accommodated in the case 41, and the speed reducing portion 51 is incorporated. The case 41 is provided with a flange A. The output shaft 27 of the helical gear unit 20 is inserted and connected to the worm shaft 11. Specifically, torque is transmitted to a key groove (not shown) of a female hole machining portion of the worm shaft 11 via a key 27 ′ attached to the output shaft 27 of the helical gear unit 20. The worm gear unit 10 has a structure sealed by a worm gear unit side oil seal 13.

FIG. 2 is a detailed cross-sectional view of a main part of the embodiment of FIG.
When the output shaft 23 of the motor M rotates, the rotation is reduced and transmitted from the pinion 24 at the tip thereof to the intermediate gear 25, and the rotation is reduced from the intermediate pinion 26 of the intermediate shaft to the output gear 28 of the helical gear unit output shaft 27. It is transmitted. The rotation transmitted to the helical gear unit output shaft 27 is transmitted to the worm shaft 11 on the worm gear unit 10 side. The rotation is further decelerated by the worm gear 12 on the worm shaft 11 and transmitted to the output shaft 30, and the output shaft 30 rotates with a predetermined torque.

  In this embodiment, the independent high-speed multi-stage helical gear unit 20 and the low-speed worm gear unit 10 are connected to each other by inserting the protruding shafts between each other and the inlay connection between the flanges A and B and the fastening bolt 62. It is fixed. Therefore, since only the external connection portion of the apparatus needs to be separated and connected, no special assembling skills necessary for gear meshing or the like are required.

  FIG. 3 schematically shows the configuration of the present invention. The features of the present invention in which the helical gear unit 20 and the worm gear unit 10 that are independent of each other are externally connected at the separation / connection part 60 are shown.

In addition, the case 22 of the speed reduction part 50 of the helical gear unit 20 and the case 42 of the motor M can also be separated as necessary. As a result, as shown in FIG. 4, when three types of helical gear units (A, B, C) are prepared in advance for one type of worm gear unit, the customer can select the helical gear unit side according to the application. Multi-purpose corresponding to the application is possible.
For example, besides the (dedicated) motor with which the embodiment has already been described, “motor-less type” and “commercially available motor mounting specifications” can be easily accommodated.
FIG. 4 shows an embodiment of the present invention, “no motor type”, and “commercially available motor mounting specifications” in order from the top.
The “no motor type” in the middle is a helical gear unit 20 ′ in which the (dedicated) motor M in the embodiment of the present invention is eliminated and the input shaft 31 is provided on the opposite side of the output shaft 23 in FIGS. It is suitable for the case where it is separately arranged and connected to the input shaft 31 by coupling or the like.
The lower part is a helical gear unit 20 ″ with a commercially available motor M ′ mounting specification, which is suitable when using not only a general commercially available motor but also a special motor such as a flameproof motor. Corresponding to the commercially available motor M ′ is performed by attaching an adapter AT. Specifically, the helical gear unit 20 ″ and a commercially available motor are connected by an adapter AT and a flange portion of the commercially available motor, and are fixed by a fastening bolt. The rotation of the motor is a key (not shown) attached to the motor output shaft. To the key groove of the female hole machining portion of the input shaft (adapter input shaft pinion) (not shown) of the helical gear unit 20 ″.

  The features of the helical gear unit 20 and the worm gear unit 10 which are the respective gear units of the present invention are that each gear unit is sealed by an oil seal and has an independent structure in addition to the inlay coupling method. Therefore, in the reduction ratio recombination work, these gear units need only be separated from the shafts and the spigot joints and reassembled using only the external connection part 60. Therefore, there is no need to perform “oil extraction and injection work” associated with the conventional disassembly and modification work of the gear box. This is clear from the comparison between FIG. 3 and FIG. 6 and is a major feature of the present invention.

  In addition, since a common case and housing can be used for each gear unit in the present invention, if each gear unit is assembled in advance, the reduction ratio combination of the worm gear unit 10 and the helical gear unit 20 is changed. By simply doing, it is possible to use a gear unit with the same shape to meet the specifications for each application and make a series. In addition, there is an advantage that it is possible to quickly cope with the final assembly of the product.

  In addition, a low noise design gear motor is combined with a worm gear characterized by quietness, which enables low noise operation.

The front view which made a part of embodiment of the present invention a section. Detailed sectional drawing of the principal part of embodiment of this invention. 1 is a schematic diagram of an embodiment of the present invention. Explanatory drawing which shows the example of expansion | deployment utilization of this invention. The front view which made the principal part of the conventional two-stage type worm speed reducer the cross section. Schematic of a conventional two-stage worm speed reducer.

Explanation of symbols

10: (Low speed side) Worm gear unit 11: Worm shaft 12: Worm gear 20: (High speed side) Multi-stage helical gear unit 41: Worm gear unit case 27: Multi-stage helical gear unit output shaft 40: Multi-stage helical gear unit case A, B: Inlay Flange M for coupling: (dedicated) motor

Claims (2)

The worm gear unit from which the worm shaft protrudes and the multistage helical gear unit with a motor from which the output shaft protrudes are connected by inserting one of the shafts into the other, and the cases are in-row coupled at the opposing flanges. A helical worm reducer with orthogonal motor,
The opposing flanges are fixed with fastening bolts in the axial direction,
The connection between the shafts is a connection by a key and a key groove,
The two gear units are sealed with oil seals at the opposing flanges, respectively.
Helical worm reducer with orthogonal motor.   A series of helical worm gear reducers with orthogonal motor, wherein the group of worm gear units of claim 1 having a plurality of reduction ratios and the group of multi-stage helical gear units with motors of claim 1 having a plurality of reduction ratios can be combined. .

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