JP2009150489A - Orthogonal reduction gear improved in structure of input side shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the strength of an input side shaft in an orthogonal reduction gear, and to make the structure compact in size. <P>SOLUTION: An intermediate shaft 13 includes a main shaft 13b and a pinion insertion section 13c having a diameter smaller than that of the main shaft 13b and fixing a bevel pinion 23. When the length of a position from a position for mounting a nut 42 in the pinion insertion section 13c to the main shaft 13b is considered as a pinion insertion length L<SB>p</SB>, the intermediate shaft 13 is formed so that the ratio L<SB>p</SB>/L<SB>s</SB>of the pinion insertion length L<SB>p</SB>relative to the length L<SB>s</SB>of the main shaft 13b falls within a range of 1.0 or longer or shorter than 1.8. Thus, the shaft diameter of the pinion insertion section 13c can be enlarged and the length of the intermediate shaft 13 can be shortened, and therefore, the strength can be increased and the structure can be made compact in size. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an orthogonal reduction device, and more particularly to an orthogonal reduction device in which the strength of an input side shaft is improved as compared with the conventional one and the size is reduced.

  An orthogonal reduction device (orthogonal shaft reduction device, orthogonal type reduction device, orthogonal reduction device) is a reduction device (reduction device) that can convert the rotation of input power into an orthogonal direction. If this orthogonal reduction gear is used in conjunction with a motor, a motor that is long in the axial direction can be arranged along a belt conveyor or the like. Therefore, orthogonal reduction gears are widely used as power sources for industrial transport crises such as belt conveyors.

  As a typical example of the orthogonal reduction gear, as schematically shown in FIG. 5A, a one-stage reduction gear including a motor 100, an input shaft 101, and an output shaft 102, and FIG. Can be cited as a two-stage speed reducer in which an intermediate shaft 103 is provided between the input shaft 101 and the output shaft 102. In the first-stage reduction gear, a meshing portion (referred to as a bevel reduction portion 110 for convenience of description) between a bevel gear 112 provided on the output shaft 102 and a bevel pinion 111 provided on the input shaft 101 functions as a reduction portion. On the other hand, in the two-stage type reduction gear, a planetary reduction unit 120 including a sun gear 121, an internal gear 122, and a planetary gear 123 is formed at a coupling portion between the input shaft 101 and the intermediate shaft 103. The attached sun gear 121 meshes with the planetary gear 123, and this planetary gear 123 is further meshed with the internal gear 122. Thereby, a revolution motion is given from the sun gear 121 to the planetary gear 123, and this revolution motion is given to the bevel pinion 111 via the intermediate shaft 103, and the bevel pinion 111 rotates. That is, in the two-stage reduction gear, the planetary reduction unit 120 functions as a first-stage reduction unit, and the bevel reduction unit 110 functions as a second-stage reduction unit.

  Various techniques have been proposed for the orthogonal reduction gear as described above. For example, Patent Document 1 discloses a technique related to a reduction gear connecting structure in the case where an orthogonal reduction gear and a planetary reduction gear are used in combination. The purpose of this technology is to flexibly respond to specifications (requests) such as the counterpart machine and rotational power source, and to reduce the size of the entire device while maintaining optimal power transmission efficiency. By connecting a joint flange between the speed reducer and the orthogonal speed reducer, it is connected by “two connecting surfaces”, and it is possible to prepare multiple types of “independent” orthogonal speed reducers for a specific planetary speed reducer. It is the composition to do.

That is, since the power transmission capability of the orthogonal reduction gear is relatively lower than the power transmission capability of the planetary reduction gear, it is necessary to set the rigidity of the orthogonal reduction gear slightly higher. Therefore, when these reduction gears are combined, the orthogonal reduction gear is often a little larger and the planetary reduction gear is a little smaller in many cases. However, if such a combination is limited, the combination of reduction gears is also limited. Therefore, in Patent Document 1, an attempt is made to widen the range of combinations of reduction gears by using the above-described connection structure.
JP 2006-226533 A (released August 31, 2006)

  By the way, in the vicinity of the input / output coupling part of the orthogonal reduction gear, a large load is applied because the input power is converted into the orthogonal direction and output. In particular, in recent years, there has been a demand for a small, high-torque quadrature reducer for the purpose of reducing the size and weight of the belt conveyor and reducing the belt width. . Therefore, in the configuration where the bevel pinion is inserted into the input shaft of the orthogonal reduction gear or the intermediate shaft is provided between the input shaft and the output shaft, the strength tends to be insufficient at the bevel pinion insertion portion of the intermediate shaft. It has come to be found.

  Patent Document 1 discloses a technique for proposing a novel coupling structure between reduction gears, and attempts to solve problems peculiar to the orthogonal reduction gear. Problems in the vicinity of the binding site are not considered.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a technique that improves the strength of the input side shaft in the orthogonal reduction gear, makes the structure compact, and further reduces the number of parts. .

  As a result of intensive studies on the above problems, the present inventors have improved the strength in the vicinity of the input / output binding site by setting the length of the insertion site of the bevel pinion formed on the input shaft or intermediate shaft to be relatively short. In addition, the inventors have found that the structure can be made compact and the number of parts can be reduced, and the present invention has been completed.

That is, the orthogonal reduction gear according to the present invention is provided on the input side shaft that is rotatable by being directly or indirectly coupled to the drive source and the input side shaft in order to solve the above-described problems. A bevel pinion, a bevel gear meshing with the bevel pinion, and an output shaft provided in the bevel gear and disposed in a direction orthogonal to the input side shaft, The side shaft includes a shaft main body connected to the drive source, a main shaft protruding from the shaft main body toward the bevel gear, and a pinion insertion portion having a diameter smaller than that of the main shaft and fixing the bevel pinion. The bevel pinion has at least a fitting hole formed in the bevel pinion inserted into the pinion insertion portion, and is located on the bevel gear side of the pinion insertion portion. By attaching a fixing member that maintains the fixed state of the bevel pinion to the tip of the input side shaft, the fixing member is fixed to the input side shaft, and further, from the mounting position of the fixing member in the pinion insertion portion. When the length of the position to the main shaft portion is the pinion insertion length, the ratio of the pinion insertion length to the length of the main shaft portion is in the range of 1.0 or more and less than 1.8 so that the input side A shaft is formed.
In the orthogonal reduction gear, for example, the input side shaft includes at least a drive shaft directly coupled to a drive source and an intermediate shaft provided between the drive shaft and the output shaft, The intermediate shaft may include an intermediate shaft main body coupled to the drive shaft, and the main shaft may protrude from the intermediate shaft main body toward the bevel gear. The input shaft may be a drive shaft. The structure which consists only of (input shaft) may be sufficient.
In the orthogonal speed reducer, when the transmission side of the rotational driving force on the output shaft is the downstream side, and the meshing position side of the bevel gear and bevel pinion on the output shaft is the upstream side, the output shaft is fixed. More preferably, the shaft diameter from the contact position of the bevel gear to the position of the bearing provided at the upstream end of the output shaft is larger than the downstream shaft diameter.

  According to the said structure, the shaft diameter of the front-end | tip part of the input side shaft used as the insertion site | part of a bevel pinion can be made larger than before. Therefore, the strength of the input side shaft is improved. As a result, the strength of the vicinity of the input / output coupling part is improved, and the length of the input side shaft can be shortened. It can be made compact. Furthermore, by changing the shaft shape of the output shaft, the spacer that has been required to be provided on the output shaft can be changed to a cheaper one, or the spacer itself can be eliminated. Therefore, the number of parts can be reduced, and the manufacturing cost of the orthogonal reduction gear can be reduced.

  An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the present invention is not limited to the following embodiments, and various modifications can be made within the scope shown in the claims, and techniques disclosed in different embodiments and specific examples, respectively. Needless to say, embodiments obtained by appropriately combining technical means are also included in the technical scope of the present invention.

  For example, as shown in FIG. 2, the orthogonal reduction device according to the present embodiment includes an input shaft 11, an output shaft 12 arranged in a direction orthogonal to the input shaft 11, and intermediate shafts provided between these axes. 13, and a planetary reduction unit 30 including a sun gear 31, an internal gear 32, and a planetary gear 33 is formed at a coupling portion of the input shaft 11 and the intermediate shaft 13. The input shaft 11 and the intermediate shaft 13 can be regarded as “input side shafts”. Further, a bevel pinion 23 is provided at the tip of the intermediate shaft 13, and a bevel gear 22 is provided at an intermediate position of the output shaft 12, and the bevel reduction unit 20 is engaged with the bevel gear 22 and the bevel pinion 23. Is formed. The input shaft 11, the output shaft 12, and the intermediate shaft 13 are all supported by a plurality of bearings 40.

  The specific shape of each axis is not particularly limited, and a known configuration can be suitably employed. For example, the output shaft 12 may be a solid shaft or a hollow shaft. Similarly, the specific configurations of the planetary reduction unit 30 and the bevel reduction unit 20 are not particularly limited, and a known gear shape or a combination thereof can be suitably used.

  The input shaft 11 can be rotated by being coupled to a drive source such as a motor, and the intermediate shaft 13 is coupled to the input shaft 11 via the planetary speed reduction unit 30 to be rotated from the drive source. Power is transmitted via the input shaft 11. In other words, the input shaft 11 and the intermediate shaft 13 can be collectively viewed as an “input shaft” (or input side shaft) in a broad sense. In this case, the narrowly defined “input shaft 11” is directly coupled to the drive source. Can be viewed as a “drive shaft”. Thus, in this embodiment, the two-stage orthogonal reduction gear provided with the planetary reduction part 30 and the bevel reduction part 20 is illustrated.

  For example, as shown in FIG. 3, the appearance of the orthogonal reduction gear is L-shaped, and the rotational power of a motor (drive source) (not shown) is transmitted from the lateral direction in the figure, and the planetary reduction unit 30 and the bevel reduction unit. 20 is transmitted as rotational power of the output shaft 12 in the vertical direction in the figure. That is, the rotation shaft of the motor is coupled to the input shaft 11 shown in FIG. 2, and the rotational power of the motor is converted to the orthogonal direction, decelerated and transmitted to the output shaft 12. In this embodiment, both FIG. 2 and FIG. 3 show only the main configuration including the casing 41, and other detailed configurations can adopt a conventionally known configuration suitably. Not specifically described.

In the orthogonal reduction gear according to the present invention, the length of the shaft of the intermediate shaft 13 is set to a predetermined ratio at the coupling portion between the intermediate shaft 13 and the output shaft 12 that are the input side shafts of the bevel reduction unit 20. It is set. Specifically, as shown in the upper part of FIG. 1, the intermediate shaft 13 includes an intermediate shaft main body portion 13a connected to the input shaft 11 side, and a main shaft portion protruding from the intermediate shaft main body portion 13a to the bevel gear 22 side. 13b and a pinion insertion portion 13c having a diameter smaller than that of the main shaft portion 13b and fixing the bevel pinion 23. The bevel pinion 23 has at least a fitting hole 23a formed in the bevel pinion 23 fitted in the pinion insertion portion 13c, and then the tip of the pinion insertion portion 13c (the intermediate shaft 13 on the bevel gear 22 side). The fixing member 42 that maintains the fixed state of the bevel pinion 23 is attached to the tip end of the bevel pinion 23. Here, when the length of the position from the mounting position of the fixing member 42 in the pinion insertion portion 13c to the main shaft portion 13b has a pinion insertion length L _P, the pinion insertion length L _P to the length L _S of the main spindle section The ratio L _P / L _S is set in a range of 1.0 or more and less than 1.8, more preferably in a range of 1.0 or more and less than 1.5.

If L _P / L _S is within the above range, the shaft diameter of the pinion insertion portion 13c can be increased and the pinion insertion length L _P can be shortened. As a result, the strength of the pinion insertion portion 13c, that is, the intermediate shaft 13 can be improved, and the length of the intermediate shaft 13 can be shortened to make the bevel reduction portion 20 compact. As shown in the examples described later, the shaft diameter can be improved within a range of 8 to 11% as compared with the prior art, and the pinion insertion length L _P is shortened within a range of 7 to 10%. It becomes possible.

On the other hand, if L _P / L _S is less than 1.0, the pinion insertion length L _P becomes too short, and interference occurs in the meshing state of the bevel pinion 23 and the bevel gear 22, which is not preferable. . Further, when L _P / L _S is less than 1.0, the shaft diameter can be increased to exceed 11%, but in this case, the thickness of the bevel pinion 23 must be reduced, Since it becomes impossible to use the bevel pinion 23 having an appropriate performance, it is not preferable. On the other hand, if L _P / L _S is 1.8 or more, the configuration is the same as that of the conventional intermediate shaft 13, and it is not preferable because it is impossible to obtain strength and effect of compactness. In addition, it is more preferable that L _P / L _S is less than 1.5 because the effects of strength improvement and compactness can be further improved.

In FIG. 1, the upper side of the intermediate shaft 13 is the length setting based on the present invention, while the lower side is the conventional length setting. As apparent from the comparison vertically without change the length L _S of the main shaft portion 13b, by shortening the pinion insertion length L _P, increasing the shaft diameter of the pinion insertion part 13c from d0 d1 Can do. By increasing the shaft diameter, not only the strength of the shaft itself is improved, but also by reducing the length of the shaft, the force applied to the shaft by the principle of the lever due to the load applied to the bevel reduction unit 20 can be reduced. It becomes possible. Therefore, the strength of the intermediate shaft 13 can be further improved.

  Here, the specific configuration of the fixing member is not particularly limited, and the fixing member is attached to the tip of the pinion insertion portion 13c in a state where the pinion insertion portion 13c is fitted in the fitting hole 23a of the bevel pinion 23. If the bevel pinion 23 can be integrally fixed to the intermediate shaft 13, a known configuration can be adopted. In the present invention, for example, after the tip of the pinion insertion part 13 is processed into a bolt shape, a nut having a loosening prevention function may be attached as a fixing member, or a general nut having no loosening prevention function may be fixed. You may make it avoid loosening of a nut using a screw lock agent, after attaching as a member.

  As the screw lock agent, a known anaerobic sealant can be suitably used. Specifically, for example, a sealing agent containing a (meth) acrylic acid ester monomer as a main component can be mentioned. This type of sealant does not polymerize (meth) acrylic acid ester monomer while exposed to air, but the monomer undergoes a polymerization reaction when entering the fastening part of the nut and bolt part, and (meth) acrylic. A polymer is formed and cured. This prevents the nut from loosening and seals the fastening portion. From the viewpoint of cost, a method of fixing a nut using a screw lock agent is preferable.

Further, when the bevel pinion 23 is fixed to the pinion insertion portion 13c, in order to prevent the bevel pinion 23 from moving in the rotation direction, a key groove is formed in the bevel pinion 23 and the pinion insertion portion 13c to interpose a key. It is preferable. Here, if the L _P / L _S is less than 1.0 and the shaft diameter is set too large, the strength of the key may be lowered, which is not preferable. From this point of view, the lower limit of L _P / L _S is preferably 1.0.

  In addition, in the present invention, as shown in FIGS. 4A and 4B, by changing the shape of the output shaft 12, not only the strength of the bevel reduction unit 20 but also the number of parts can be reduced. That is, as shown in FIG. 2, in the orthogonal reduction gear according to the present embodiment, the output shaft 12 is supported by the bearings 40 at least in two upper and lower portions, and the bevel gear 22 is fixed to an intermediate portion thereof. Here, in the conventional output shaft 102, as shown in FIG. 4C, the tubular spacer 130 is disposed between the upper bearing 40 and the bevel gear 112. Processing was costly.

  Therefore, as shown in FIG. 4A, the transmission side (lower side in the figure) of the rotational driving force in the output shaft 12 is the downstream side, and the meshing position side of the bevel gear 22 and the bevel pinion 23 in the output shaft is the upstream side. In the output shaft 12, the shaft diameter from the contact position of the fixed bevel gear 22 to the position where the bearing 40 provided at the upstream end of the output shaft 12 is larger than the downstream shaft diameter. To do. As a result, it is not necessary to provide the tubular spacer 130. Instead, it is only necessary to provide the annular spacer 43 on the downstream side. In either case, there is no change in the number of members in that the tubular spacer 130 and the annular spacer 43 are provided. However, the cost of the annular spacer 43 is lower than that of the tubular spacer 130 from the processing surface, so that the cost can be reduced. it can.

  Furthermore, as shown in FIG. 4B, the shape of the bevel gear 22 can be changed depending on the specifications of the orthogonal reduction gear. That is, if the bevel gear 22 is configured to be thick on the output side, the annular spacer 43 can be omitted, and the number of members can be reduced, so that further cost reduction can be achieved. In addition, about the process which changes the shaft diameter of the output shaft 12, since the same process is required in any of Fig.4 (a)-(c), the cost reduction effect by the change of a spacer shape or the shape of the bevel gear 22 is effective. Will be bigger.

  In the present embodiment, as a specific configuration of the orthogonal reduction gear for explaining the present invention, a configuration including the intermediate shaft 13, in other words, a two-stage type reduction gear illustrated in FIG. However, the present invention is of course not limited to this, and may be a one-stage type speed reducer illustrated in FIG. In this case, a configuration in which the intermediate shaft 13 and the planetary reduction unit 30 are not provided, that is, a configuration in which a bevel pinion 23 is attached to the input shaft 11 instead of the sun gear 31 and meshes with the bevel gear 22 of the output shaft 12. Furthermore, it goes without saying that the present invention can also be applied to known orthogonal reduction gears other than the one-stage reduction gears and the two-stage reduction gears.

  Hereinafter, based on a more specific Example, Embodiment of this invention is described in more detail. Of course, the present invention is not limited to the following examples, and it goes without saying that various aspects are possible in detail.

In Able reducer NEV series orthogonal reducer (manufactured by Nidec Sympo Co., Ltd.), change the design of the intermediate shaft for each of frame numbers B, C, D and E, and insert the pinion length before and after the design change. is L _P, the main shaft portion length L _S, shaft diameter, and the assembly distance of the bevel decelerating portion (distance from the output shaft of the center line to the main shaft portion immediately before the intermediate shaft) is measured, the rate of change and L _{P /} L _S The ratio of was calculated. The results are shown in Table 1.

As shown in Table 1, in the prior art (lower stage of each frame number in the table), L _P / L _S is 1.8 or more, whereas in the present invention (upper stage of each frame number in the table) Accordingly, it can be seen that L _P / L _S is 1.4 or less. It can also be seen that both the shaft diameter and the assembly distance are better in the present invention than in the prior art.

  As described above, according to the present invention, in the bevel reduction portion of the orthogonal reduction gear, the length of the fixed portion of the bevel pinion fixed to the input side shaft is shortened, thereby increasing the diameter of the input side shaft. The bevel reduction part is made compact by improving the strength of the reduction part and shortening the shaft length. Therefore, according to the present invention, it is possible to obtain an orthogonal reduction gear with further improved reliability and reduced size. Therefore, the present invention can be suitably used in the entire technical field related to an orthogonal speed reducer including a bevel speed reducing unit.

In the orthogonal reduction gear according to the present invention, a schematic diagram showing a state in which the input-side shaft configuration of the present invention is compared with the conventional input-side shaft configuration of the bevel reduction portion that is the meshing portion of the bevel pinion and the bevel gear. It is. It is a typical perspective view which shows an example of an internal shaft structure as a specific example of the orthogonal reduction gear shown in FIG. It is a side view which shows an example of the external appearance of the orthogonal reduction gear shown in FIG. (A) And (b) is typical sectional drawing which shows an example of the shaft shape of the output shaft in the orthogonal reduction gear based on this invention, (c) is the shaft shape of the output shaft in the conventional orthogonal reduction device. It is a typical sectional view showing an example. (A) And (b) is a schematic diagram which shows the typical structural example of the shaft structure of the orthogonal reduction gear which can apply this invention, (a) is a 1 step | paragraph type reduction gear, (b) is a 2 step | paragraph. A type reduction gear is shown.

Explanation of symbols

11 Input shaft (input side shaft / drive shaft)
12 Output shaft 13 Intermediate shaft (input side shaft)
13a Intermediate shaft body (shaft body)
13b Main shaft portion 13c Pinion insertion portion 22 Bevel gear 23 Bevel pinion 23a Fitting hole 40 Bearing 42 Fixing member L _P pinion insertion length L _S Length of main shaft portion

Claims (3)

An input side shaft that is rotatable by being directly or indirectly coupled to a drive source;
A bevel pinion provided on the input shaft;
A bevel gear meshing with the bevel pinion,
An orthogonal reduction device provided on the bevel gear and provided with an output shaft disposed in a direction orthogonal to the input side axis;
The input side shaft includes a shaft main body connected to a drive source, a main shaft protruding from the shaft main body toward the bevel gear, and a pinion insertion that is smaller in diameter than the main shaft and fixes the bevel pinion Part and
The bevel pinion has at least a fitting hole formed in the bevel pinion inserted in the pinion insertion portion, and the bevel pinion at the tip of the input side shaft on the bevel gear side of the pinion insertion portion. By attaching a fixing member that maintains the fixed state, it is fixed to the input side shaft,
Furthermore, when the length from the mounting position of the fixing member to the main shaft portion in the pinion insertion portion is the pinion insertion length, the ratio of the pinion insertion length to the length of the main shaft portion is 1.0 or more and 1. The orthogonal speed reducer, wherein the input side shaft is formed so as to be within a range of less than 8. The input side shaft is composed of at least a drive shaft directly coupled to a drive source, and an intermediate shaft provided between the drive shaft and the output shaft,
2. The orthogonal reduction device according to claim 1, wherein the intermediate shaft includes an intermediate shaft main body coupled to the drive shaft, and the main shaft projects from the intermediate shaft main body toward the bevel gear. . Furthermore, when the transmission side of the rotational driving force in the output shaft is the downstream side, and the meshing position side of the bevel gear and bevel pinion in the output shaft is the upstream side,
In the output shaft, the shaft diameter from the contact position of the fixed bevel gear to the position of the bearing provided at the upstream end of the output shaft is larger than the shaft diameter on the downstream side. Item 3. The orthogonal reduction device according to item 1 or 2.

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