JP2006349054A - Geared motor and connection member for geared motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To utilize a motor with a pinion as a motor of a hypoid geared motor. <P>SOLUTION: A hypoid gear 30 is connected with a tip of a motor shaft 20 through the motor M1 forming a helical pinion 22 and a connection member CM. The connection member CM is composed of a first shaft member 24 and a second shaft member 25. The first shaft member 24 has a first connection part 26 connected with the helical pinion 22 at one end and a second connection part 27 at the other end. The second shaft member 25 has a third connection part 28 connected with the second connection part 27 at one end and forms a hypoid pinion 29 meshing with the hypoid gear 30 on the other end side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a geared motor, in particular, a geared motor using a motor with a pinion having a pinion on a motor shaft, and a connection member suitable for use in the geared motor.

  A hypoid gear set composed of a hypoid pinion and a hypoid gear is known as a so-called orthogonal transformation mechanism because the direction of the rotation axis can be changed to a right angle. The orthogonal transformation mechanism with a hypoid gear set can reduce the size of the device, is more efficient than a worm gear set with similar functions, and can be operated with lower noise and vibration than a bevel gear set. In addition, a high reduction ratio can be secured in one stage. For this reason, there is a strong need in a specific field for a drive device incorporating an orthogonal transformation mechanism using a hypoid gear set. For example, a so-called `` hypoid geared motor '' in which a gear box containing a quadrature conversion mechanism by a hypoid gear set and a motor are integrally assembled so that an output adjusted to an optimum torque and rotation speed can be obtained independently. This is an example (see Patent Document 1, for example).

  By the way, a gear box used as a geared motor has an overwhelmingly large number of parallel shaft gear mechanisms on a quantity basis because of cost. Therefore, in response to this phenomenon, a spur pinion (spur gear) or a helical pinion (slope gear) is formed in advance on the motor shaft, and the motor shaft is also used as the input shaft function of the first stage of the reduction gear. Many motors with pinions are also shipped.

  On the other hand, in recent factories, in order to realize the production of a small variety of products, “modification” is frequently performed to rearrange the mechanical equipment and transport equipment in the factory or to change to a more appropriate torque and transport speed. It has come to be. For this reason, for example, in a machine that has previously used a parallel shaft gear mechanism, there is often a demand for converting the rotation direction of the output shaft to a perpendicular direction. In response to such a request, in Patent Document 2, in order to make use of an existing motor part with a pinion, after the motor is rotated once by a gear (intermediate stage) meshing with a pinion formed on the motor shaft, A configuration for transmitting the power to the hypoid pinion is disclosed.

JP 2001-74110 A Japanese Patent Laid-Open No. 10-278846

  “Geared motor” is one part of the entire transport system, for example, but it is considered that one of its major advantages is that the specifications of the entire device can be changed by replacing this part. It was. In this sense, it can be said that the geared motor has been positioned as “the smallest unit component” in the system.

  Geared motors are roughly classified into parallel axis series and orthogonal axis series. From such a background, conventionally, for example, a motor in which a parallel axis spur pinion or a helical pinion is formed at the tip of a motor shaft is designed with a motor in which an orthogonal axis hypoid pinion is formed, The fact is that each series was almost completely separated in both production and sales.

  If technology such as that described in Patent Document 2 is used, it is possible to use “motor diversion”. However, once a gear (intermediate stage) meshes with a pinion formed on the motor shaft. After receiving the rotation of the motor once, the power is transmitted to the original hypoid pinion, so the hypoid gear set cannot be used in the "first stage", and the hypoid gear set can be increased in size and cost can be greatly increased. Increases nature. On the other hand, if the intermediate stage is used without being decelerated and idled, the cost is increased as much as the intermediate stage is interposed, and the space efficiency is also deteriorated.

  The present invention focuses on a problem that has existed under such a background, and solves this problem by a novel idea, and originally, a gear box for a parallel shaft and An object of the present invention is to make it possible to use a motor with a pinion to be used in combination as a motor of a geared motor having a hypoid gear set.

  It is another object of the present invention to provide a geared motor connecting member suitable for utilizing a parallel shaft type pinion motor as a hypoid geared motor.

  The present invention includes a motor having a pinion formed on a motor shaft, a first connecting member connected to the pinion at one end, a first shaft member having a second connecting member at the other end, A second shaft member having a third connecting portion connected to the second connecting portion and having a hypoid pinion formed at the other end; and a hypoid gear meshing with the hypoid pinion, the pinion and the first Of the connection with the connection part and the connection between the second connection part and the third connection part, at least one of the connections has a structure capable of sliding in the axial direction. Settled.

  A motor having a hypoid pinion formed on the motor shaft has a very special tooth profile, and therefore has a number of potential problems such as difficulty in changing the reduction ratio, for example. On the other hand, motors with spur pinions and helical pinions are abundant on the market. According to the present invention, a hypoid gear which takes out a motor with a pinion currently in stock by a manufacturer or a motor with a pinion currently in operation at each factory etc. from the output shaft orthogonal to the motor shaft. There is a way to use it as a motor.

  Further, since the motor is a parallel axis pinion motor to the last, and the hypoid pinion does not exist on the “motor” side, a design change such as a change in reduction ratio can be facilitated. Furthermore, since either or both of the connection between the pinion and the first connection part, the connection between the second connection part and the third connection part is slidably connected in the axial direction, the motor or the deceleration Various dimensional errors and assembly errors on the machine side can be absorbed very easily, and the thrust force generated in the hypoid gear set can be effectively cut off. Furthermore, since the hypoid pinion is on the “connecting member” side separated from the motor, and the connecting member itself is divided into two shaft members, machining is easy and variations of different reduction ratios are constructed. easy.

  Further, according to the present invention, compared to a structure in which the pinion of the motor shaft is received by, for example, a normal parallel shaft gear mechanism and the hypoid gear set is connected to the subsequent stage, a high-cost hypoid gear set can be used in the “first stage” with small torque The advantage of being able to do it is also obtained.

  In addition, this invention can also be grasped | ascertained from a viewpoint of the connection member for geared motors for transmitting rotation of the motor shaft which has a pinion in the front-end | tip to the reduction part side.

  According to the present invention, a motor with a pinion that is often used in existing factories (or in the market of geared motors) can be used as a motor of a hypoid geared motor as it is, and it is useful and designed to prevent waste. A geared motor with a high degree of freedom can be obtained.

  In addition, the manufacturer has a high degree of freedom in changing the reduction ratio, and the effect that a product group of hypoid geared motors covering a large number of reduction ratios can be easily constructed.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 are respectively a front sectional view and a developed plan sectional view of a geared motor according to an example of an embodiment of the present invention.

  The motor M1 of the geared motor GM1 (only the front cover 18 is shown) is integrally provided with a helical pinion 22 at the tip of the motor shaft 20.

  The helical pinion 22 is connected to the connecting member CM. The connecting member CM is composed of two shaft members, that is, a first shaft member 24 and a second shaft member 25.

  A first connecting portion 26 is formed on one end side of the first shaft member 24. When the first connecting portion 26 is connected to the helical pinion 22, the helical pinion 22 and the first shaft member 24 are integrated. Can be rotated (at a constant speed).

  In this embodiment, the first connecting portion 26 includes friction fastening means and is configured to be frictionally connected to the helical pinion 22 from the outside in the radial direction of the helical pinion 22.

  A second connecting portion 27 is formed on the other end side of the first shaft member 24, while a third connecting portion 28 corresponding to the second connecting portion 27 is formed on one end side of the second shaft member 25. Has been. The specific structures of the second connecting portion 27 and the third connecting portion 28 are both “key grooves” in this embodiment, and the second connecting portion 27 and the third connecting portion 28 are connected via a key Ke. It is set as the structure. Since the connection is made by the key Ke, the first shaft member 24 and the second shaft member 25 can move relative to each other in the axial direction and can rotate integrally (at a constant speed) in the circumferential direction. In this case, the key Ke may be regarded as a component part of the second connection part 27 or a component part of the third connection part 28.

  A hypoid pinion 29 is integrally formed on the other end side of the second shaft member 25. The hypoid pinion 29 meshes with the hypoid gear 30, and together with the hypoid gear 30, forms a hypoid reduction mechanism 32 corresponding to the first stage of the reduction part G1.

  The first and second parallel shaft gear speed reduction mechanisms 34 and 36 are arranged at the subsequent stage of the hypoid speed reduction mechanism 32 and are finally taken out from the output shaft 40.

  1, it appears that the hypoid gear 30 and the pinion 33 are meshed with each other, but this is incorporated in the same rotating shaft 31 as the hypoid gear 30 as is apparent from the developed flat section shown in FIG. Further, a first parallel shaft gear reduction mechanism 34 for the purpose of speed increase is formed by engaging a spar (or helical) gear 35 having substantially the same diameter with the pinion 33.

  The motor shaft 20 and the output shaft 40 are orthogonal to each other, and the geared motor GM1 constitutes a “hypoid geared motor”. The axis 20A of the motor shaft 20 and the axis 40A of the output shaft 40 do not intersect on the same plane, but in this specification, the term “orthogonal” is used including such an intersection. Shall.

  A cylindrical portion 44 is formed on the joint cover 42 of the deceleration portion G1. Bearings 46 and 48 are disposed inside the cylindrical portion 44, and the bearings 46 and 48 rotatably support the second shaft member 25. Further, a projection 50 for restricting movement of the bearing 48 in the axial direction (right direction in the drawing) is formed at the end of the cylindrical portion 44. The second shaft member 25 is formed with a ring-shaped step portion 25T in order to define the position in the axial direction with respect to the bearings 46 and 48. Furthermore, a retaining ring 52 is arranged on the motor M side of the cylindrical portion 44, and restricts movement of the bearing 46 in the axial direction (left direction in the figure). Reference numeral 53 denotes a shim for adjusting the positions of the three members (the bearing 46, the second shaft member 25, and the bearing 48) with respect to the joint cover 42.

  Next, the operation of the geared motor GM1 according to this embodiment will be described.

  When the helical pinion 22 of the motor shaft 20 rotates in a specific direction, the first shaft member 24 frictionally engaged with the helical pinion 22 via the first connecting portion 26 rotates integrally (at a constant speed). . This rotation is transmitted to the second shaft member 25 by key connection, that is, connection between the second and third connection portions 27 and 28. As a result, the hypoid pinion 29 formed on the other end side of the second shaft member 25 rotates, and the hypoid gear 30 engaged with the hypoid pinion 29 rotates.

  The rotation of the hypoid gear 30 is speed-up transmitted from the spur gear 35 of the first parallel shaft gear reduction mechanism 34 incorporated in the same rotation shaft 31 to the pinion 33 and then decelerated again via the second parallel shaft gear reduction mechanism 36. And taken out from the output shaft 40. The reason why the speed is once increased in the middle of the power transmission path is that various reduction ratios (from a reduction speed ratio to a high reduction ratio) are to be realized with the same number of stages. A reduction speed ratio (for example, a total reduction ratio of 5) can be realized by inserting the speed increasing stage.

  The shaft center 40A of the output shaft 40 is orthogonal (broadly defined) to the shaft center 20A of the motor shaft 20, and the rotation of the motor shaft 20 is performed from the output shaft 40 with the shaft center 20A rotated by 90 degrees. It will be taken out.

  Here, in this embodiment, since the helical pinion 22 and the first connecting portion 26 of the first shaft member 24 are connected by frictional fastening, a thrust force is not generated by the connection of this portion.

  On the other hand, the thrust force generated in the second shaft member 25 due to the meshing of the hypoid pinion 29 and the hypoid gear 30 is caused by the retaining ring 52 via the bearing 46 regardless of the direction in which the motor shaft 20 rotates. Alternatively, it is received by the protrusion 50 via the bearing 48. In this case, the second shaft member 25 slightly slides in the axial direction within the range of play of the bearings 46 and 48. However, in this embodiment, the connection between the first shaft member 24 and the second shaft member 25 (connection between the second connection portion 27 and the third connection portion 28) allows sliding in the axial direction. Since the second shaft member 25 is slightly slid in the axial direction because the connection is realized, the first shaft member 24 does not slide in conjunction with the second shaft member 25. Therefore, although the hypoid pinion 29 is connected to the motor shaft 20 having the helical pinion 22 so as to be integrally rotatable, the thrust force due to the meshing of the hypoid pinion 29 and the hypoid gear 30 is not exerted on the motor shaft 20 at all. In addition, the motor M1 does not require any design change in terms of strength (it can be used as it is).

  In addition, the hypoid pinion 29 is independent from the motor side while forming the hypoid geared motor GM1 that uses the hypoid gear set in the first stage, so that the motor side can be easily procured. Further, since the connecting member CM is divided into two shaft members (the first shaft member 24 and the second shaft member 25), the hypoid pinion 29 itself can be easily processed, and a geared motor group covering a plurality of reduction ratios. Even when building a product series consisting of the above, the degree of freedom in design can be greatly increased.

  3-5 show examples of other embodiments of the present invention.

  In the geared motor GM2 according to this embodiment, the first connecting portion 126 of the first shaft member 124 to be connected to the helical pinion 122 is not a clamp-type frictional fastening structure, and the screw 160 is a circle as shown in FIG. A structure that is screwed in the radial direction from two places in the circumferential direction and press-contacted to the helical pinion 122 is adopted. The tip of the screw 160 may be pressed against a tooth tip (not shown) of the helical pinion 122 to use frictional stress, or may be screwed between teeth to use the shearing stress of the screw 160. May be.

  When frictional stress is used, since a thrust force due to fastening does not occur in this portion, the same operation as in the previous embodiment can be obtained.

  On the other hand, when the tip of the screw 160 is screwed between the teeth, the shear stress of the screw 160 can be used, so that an effect that no slip occurs in the connecting portion is obtained. In this embodiment, since the connection between the second and third connecting portions 127 and 128 is realized by a key connection that is allowed to move in the axial direction, the thrust force of this portion is generated by the motor shaft 120 and the first shaft. It is possible to prevent the thrust force generated only on the member 124 from being propagated to the second shaft member 125 side. Conversely, the thrust force from the hypoid gear set (29, 30) side can also be blocked from propagating to the first shaft member 124 and the motor shaft 120 side.

  Since other configurations and operations are basically the same as those of the previous embodiment, the same reference numerals in the last two digits are given to the same or similar parts in the drawings, and redundant description is omitted.

  6 and 7 show an example of still another embodiment of the present invention.

  In the geared motor GM3 in this embodiment, a spur pinion 222 is formed at the tip of the motor shaft 220 of the motor M2. The first connecting portion 226 includes two plates 270, and the spur pinion 222 and the first connecting portion 226 are connected via the two plates 270.

  As shown in FIG. 7, each plate 270 has an internal tooth-shaped through hole 274 and a bolt hole 276 that can be engaged with the teeth of the spar pinion 222, and the first shaft member in a state of being overlapped with each other. It is fixed to one end of 224 via a bolt 278 (see FIG. 6). The reason why two plates 270 are prepared is to provide a sufficient capacity.

  The plate 270 of the first connecting portion 226 is slidable in the axial direction along the teeth of the spar pinion 222. Therefore, the motor shaft 220 and the first shaft member 224 can move relative to each other in the axial direction, and can rotate integrally in the circumferential direction.

  In this embodiment, since the “slidable connection in the axial direction” is realized in this portion, the connection between the first shaft member 224 and the second shaft member 225 (the second connection portion 227 and the third connection). This is realized by press fitting and integrated. That is, this portion is not connected so as to be slidable in the axial direction.

  In this embodiment, the pinion formed on the motor shaft 220 is a spar pinion 222, and the “spinning in the axial direction” is made between the spar pinion 222 and the first connecting portion 226. Therefore, the geared motor GM3 having a simple structure, a small number of parts, a low cost, and a compact size can be obtained.

  Other configurations are almost the same as those of the previous embodiment, and therefore, the same or similar parts in the figure are given the same reference numerals with the last two digits, and redundant description is omitted.

  As described above, in the present invention, at least one of the connection between the pinion and the first connection part and the connection between the second connection part and the third connection part is a connection capable of sliding in the axial direction. If it is done, it is enough. Further, various configurations can be adopted as the slidable configuration. For example, as shown in FIG. 8, the second connecting portion 327 of the first shaft member 324 and the third connecting portion 328 of the second shaft member 325 are used. May be coupled by D-cut coupling.

  In the examples shown so far, the joint covers 42, 142, 242 for housing the joint shafts 24, 124, 224 are prepared so that the gear box on the hypoid gear side can be used as it is. If the hypoid pinion and the bearing that supports it are supported by a joint cover that is separate from the motor or hypoid gear box, the low-cost bearing and joint cover can be exchanged only for thrust force and torque changes. Good. On the other hand, when it is known in advance how much thrust force is applied, for example, as shown in FIGS. 9 and 10, a cylindrical portion 464 is integrally formed in a gear box 462 on the hypoid gear 430 side. The cylindrical shaft 464 may support the joint shaft 424. Similar modifications are possible in the embodiments shown in FIGS. 3 to 5, 6, and 7. 9 and 10, the other configurations are the same as those of the previous embodiment. Therefore, in the drawings, the same or similar parts are denoted by the same reference numerals with the last two digits, and a duplicate description is provided. Omitted.

  The present invention can be applied in various situations.

  For example, as described in the above-mentioned Patent Document 1, the rotation of the motor is once received by a gear (intermediate stage) that meshes with a pinion formed on the motor shaft in an attempt to make use of an existing motor part with a pinion. Later, when the configuration for transmitting the power to the original hypoid pinion is adopted, the hypoid gear set cannot be used in the “first stage”, so that the hypoid gear set is increased in size and the cost is likely to increase significantly. However, if the intermediate stage is used in an idle state without being decelerated, not only the cost is increased as much as the intermediate stage is interposed, but also the space efficiency is deteriorated.

  In this respect, the present invention can use an existing motor with a pinion as it is, and the hypoid gear set can be used in the “first stage” only through the connecting member, and the advantage obtained in this application scene is great.

  As another application scene of the present invention, it is conceivable to actively convert the motor with a pinion of a parallel shaft system to an orthogonal geared motor. For example, manufacturers of geared motors or large factories often have a large inventory of motors with ordinary parallel shaft pinions. When the present invention is applied in such a situation, a hypoid geared motor can be realized only by procurement other than the motor system. As a result, there are cases where delivery time and cost can be greatly reduced as compared with the case where a new hypoid geared motor including a motor is procured.

  However, the industrial applicability of the present invention is not limited to these application scenes, and can be effectively used in all situations where a motor with a pinion is more widely used as a motor of a hypoid geared motor.

Front sectional view of a hypoid geared motor according to an example of an embodiment of the present invention Same expanded flat section Front sectional view of a hypoid geared motor according to another example of the present invention Same expanded flat section 4 is a side view of the vicinity of the first connecting portion in the embodiment of FIG. Front sectional view of a hypoid geared motor according to another example of the present invention The front view of the plate used in the 1st connection part of embodiment of FIG. Sectional drawing which shows the structural example of the 2nd connection part which concerns on further another embodiment of this invention, and a 3rd connection part. FIG. 1 is a front sectional view corresponding to FIG. 1, showing a modification of the embodiment of FIG. Same as above, Fig. 2

Explanation of symbols

GM1 ... Hypoid geared motor M1 ... Motor CM ... Connecting member 20 ... Motor shaft 22 ... Helical pinion 24 ... First shaft member 25 ... Second shaft member 26 ... First connecting portion 27 ... Second connecting portion 28 ... Third connecting portion DESCRIPTION OF SYMBOLS 29 ... Hypoid pinion 30 ... Hypoid gear 34, 36 ... 1st, 2nd parallel shaft gear reduction mechanism 40 ... Output shaft 46, 48 ... Bearing

Claims (6)

A motor with a pinion having a pinion formed on the motor shaft;
A first shaft member having a first connecting part connected to the pinion at one end and a second connecting part at the other end;
A second shaft member having a third connection part connected to the second connection part at one end and a hypoid pinion formed at the other end;
A hypoid gear meshing with the hypoid pinion,
Of the connection between the pinion and the first connection part and the connection between the second connection part and the third connection part, at least one of the connections is an axially slidable connection. Geared motor. In claim 1,
A geared motor characterized in that a pinion formed on the motor shaft is a helical pinion, and the connection between the second connection portion and the third connection portion is a connection that is slidable in the axial direction. . In claim 1 or 2,
The geared motor, wherein the connection between the pinion and the first connecting portion is realized by frictional engagement. In any one of Claims 1-3,
The geared motor is characterized in that the connection between the second connection portion and the third connection portion is realized by D-cut coupling. In claim 1,
A geared motor, wherein the pinion formed on the motor shaft is a spar pinion, and the connection between the spar pinion and the first connecting portion is a slidable connection in the axial direction. A connecting member used for a geared motor that transmits rotation of a motor shaft having a pinion at a tip to a speed reduction unit side,
The connecting member is
A first shaft member having a first connection part connected to the pinion at one end and a second connection part at the other end;
A second shaft having a third connection portion connected to the second connection portion at one end and a hypoid pinion that engages with the hypoid gear at the other end and can form a speed reduction mechanism of the speed reduction portion together with the hypoid gear. A connection member for a geared motor, wherein the connection between the second shaft member and the third connection portion is a connection that is slidable in the axial direction.

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