JP3769406B2 - Motor with pinion and orthogonal shaft geared motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor with a pinion having a bevel or a hypoid pinion at the tip of a motor shaft, and an orthogonal shaft geared motor formed by combining the motor with a pinion and an orthogonal shaft gear transmission.
[0002]
[Prior art]
Generally, in the case of a swinging intermeshing planetary gear structure geared motor, a gear transmission and a motor may be prepared in different series so that they can be appropriately selected and combined. Therefore, a wide variety of general-purpose motors can be selected as the motor combined with the gear transmission.
[0003]
However, in the case of an orthogonal shaft geared motor using a bevel type or a hypoid, the pinion is directly cut off on the motor output shaft (motor shaft) so that the pinion is placed in the gear case in a cantilever state, and the gear case and motor Often has a structure that connects Therefore, it is difficult to prepare many combinations of motors and gear transmissions, and it is actually difficult to use a wide variety of general-purpose motors.
[0004]
FIG. 4 shows a known example of a geared motor in which a pinion is directly cut on the output shaft of the motor (see Japanese Patent No. 2628983). In this figure, 110 is a reduction gear (orthogonal shaft gear transmission) using a hypoid gear, and 150 is a motor. The hypoid reducer 110 has an input shaft 111, an intermediate shaft 112, and an output shaft 113.
[0005]
The input shaft 111 and the intermediate shaft 112 are in a perpendicular relationship, and the intermediate shaft 112 and the output shaft 113 are in a parallel relationship. Accordingly, the input axis L1 and the output axis L2 are in a relationship (twisted state) orthogonal to each other in plan view. The input shaft 111 in this case is constituted by the output shaft 151 itself of the motor 150, and is inserted into the gear case 119 from the outside of the gear case 119, and the hypoid pinion 114 is directly cut at the tip of the input shaft 111. Yes.
[0006]
The motor output shaft 151 is rotatably supported by bearings 152 and 153 arranged at the front and rear portions of the motor casing 159, and the front end portion of the motor output shaft 151 protrudes outside the bearing 152 on the front side. This portion functions as the input shaft 111 of the hypoid reducer 110. Therefore, the hypoid pinion 114 is inserted into the gear case 119 while being cantilevered by the front bearing 152.
[0007]
The hypoid pinion 114 meshes with a hypoid gear 115 provided on the intermediate shaft 112, and the gear 116 provided on the intermediate shaft 112 meshes with a gear 117 provided on the output shaft 113. The rotation input from the hypoid pinion 114 is transmitted in the order of the hypoid gear 115 → the intermediate shaft 112 → the gear 116 → the gear 117 → the output shaft 113, and the decelerated rotation output is extracted from the output shaft 113.
[0008]
FIG. 5 shows another known example of an orthogonal shaft geared motor (see Japanese Patent Laid-Open No. 5-300695). This geared motor, for example, allows a reduction gear and a motor to be separated into independent shapes, such as a geared motor according to a swinging intermeshing idler gear structure, so that the combination of the reduction gear and the motor can be freely selected. It is a thing.
[0009]
In FIG. 5, 210 is a hypoid reducer, and 250 is a motor. In the hypoid reducer 210, 211 is an input shaft, 212 is an intermediate shaft, 213 is an output shaft, the intermediate shaft 212 is provided with a hypoid gear 215 and a gear 216, and the output shaft 213 is provided with a gear 217. 4 is the same as the hypoid reducer of FIG. 4 (in the figure, the same two parts are indicated by the same reference numerals for the same component elements).
[0010]
The difference is that the connecting case portion 219B is combined with the main body case portion 219A of the gear case 219 (corresponding to the gear case 119 of FIG. 4), and the input shaft 211 is made independent of the motor 250, so It is equipped.
[0011]
The input shaft 211 has a distal end inserted into the gear case main body 219 from the outside of the gear case main body 219, and a hypoid pinion 214 is formed at the distal end thereof. The input shaft 211 is rotatably supported by two bearings 218A and 218B arranged at intervals in the connection case portion 219B.
[0012]
In this case, the input shaft 211 is composed of a hollow shaft, and the rear end portion 211a of the input shaft 211 supported by both bearings 218A and 218B is connected to the front end of the output shaft 251 of the motor 250 from the rear end surface opening. The parts are fitted and connected. A motor mounting flange 220 is provided at the end of the connection case portion 219 </ b> B, and a flange 260 on the motor 250 side is connected to the motor mounting flange 220.
[0013]
As described above, the hollow-type input shaft 211 having the hypoid pinion 214 at the tip is rotatably attached independently to the connection case portion 219B, so that the hypoid reduction gear 210 of FIG. For example, a motor of another series of geared motor can be used in common.
[0014]
[Problems to be solved by the invention]
By the way, both of the above-mentioned two known techniques have problems to be solved.
[0015]
First, as in the technique of FIG. 4, when the hypoid pinion 114 is directly cut at the tip of the motor output shaft 151, many kinds of motor outputs are prepared by directly cutting the pinion in order to prepare many kinds of motors. An axis must be prepared. That is, the hypoid pinion 114 must be processed for each motor type (because the motor type changes in diameter and length when the motor type changes). For example, even if only one type of hypoid pinion 151 needs to be prepared, each time the type of the main mechanism part of the motor (the part that functions as a normal motor other than the pinion) is different, a pinion is attached to the motor output shaft. I had to process it.
[0016]
However, as is well known, hypoid pinions and bevel pinions require accuracy in both the radial dimension and the dimension from the machining reference surface, and a tool is prepared for each different shaft length in the machining process. Therefore, it is very expensive to prepare a large number of types of pinion shafts.
[0017]
Therefore, it is practically difficult to prepare all types of motors so that they can be combined with the gear transmission. When combining motors other than those prepared so that they can be handled immediately in advance, the customer must After receiving an order, pinion processing is often started including preparation of the equipment, and there is a problem that it is difficult to deliver at a low cost and in a short delivery time.
[0018]
In the case of the geared motor shown in FIG. 5, since the hypoid pinion does not need to be cut directly to the motor output shaft as in FIG. 4, the selection range of the motor to be combined is extended to the general-purpose motor as in the case of the cyclo-type geared motor. There is another problem that can be.
[0019]
That is, since the right half of the input shaft 211 of the hypoid reduction gear 210 is supported at both ends by two bearings 218A and 218B, when the geared motor is completed by connecting to the motor 250, the front end of the motor 250 The bearings 252 and the bearings 218A and 218B that support the input shaft 211 are arranged in close proximity to each other. Therefore, there is a problem that not only is the design excessively, the cost increases but also the axial dimension increases. there were.
[0020]
In consideration of the above circumstances, the present invention can easily prepare many kinds of combinations of pinions and main motor mechanisms, and can assemble many kinds of geared motors at low cost and with short delivery time. It is an object of the present invention to provide a motor with a pinion that can minimize the number of bearings and axial dimensions when configured, and an orthogonal shaft geared motor using the motor with a pinion.
[0021]
[Means for Solving the Problems]
According to the first aspect of the present invention, the motor shaft is rotatably supported by two bearings arranged at the front and rear portions of the motor casing, and a gear speed change is provided at the front end portion of the motor shaft protruding outward from the front bearing. In a motor with a pinion provided with a pinion for giving input rotation to the machine, the motor shaft is integrated with a rotor and cantilevered by the rear bearing, and the front end has the pinion at the front end. The main shaft and the rear end of the main shaft are connected to each other by a shaft coupling between the front end and the rear end of the main shaft. Thus, the above-described problems are solved.
[0022]
In the present invention, the motor shaft is divided into the main shaft and the pinion shaft in two axial directions, and the two shafts are joined between the two bearings in the motor casing. Therefore, the number of bearings is not increased, and the axial dimension is reduced accordingly. Without any increase, you can freely select the combination of the main mechanism of the motor including the main shaft and the pinion shaft with the pinion at the tip, and prepare various types of motors with pinions easily and at low cost. it can.
[0023]
As a result, for example, it is possible to easily combine many types of main motor mechanisms with one type of pinion shaft, and as a result, many types of motors with pinions can be easily prepared.
[0024]
In that case, in order to make it possible to easily change the combination of the pinion shaft side and the main shaft side (the main mechanism portion side of the motor), in the invention of claim 2, the motor casing is connected to the main shaft via the rear bearing. And a front cover holding the pinion shaft via the front bearing, and the front cover is coupled to the front end of the main body casing.
[0025]
Accordingly, in the present invention, if a front cover in which a pinion shaft is pre-assembled and a main body casing in which a main shaft integrated with a rotor is preliminarily prepared and appropriately selected and combined, various types can be easily obtained. A motor with a pinion can be prepared.
[0026]
In the invention of claim 3, as the shaft coupling, a fitting hole for fitting the other is provided at either the front end of the main shaft or the rear end of the pinion shaft, and the one and the other are press-fitted, shrink-fitted, bonded, etc. It is connected by the combination method.
[0027]
When coupled by such means, no key or spline is required, so that the cost can be reduced and the size can be reduced.
[0028]
Further, the orthogonal shaft geared motor of the invention of claim 4 is constituted by combining the motor with a pinion according to any one of claims 1 to 3 with an orthogonal shaft gear transmission.
[0029]
That is, the invention according to claim 4 is such that the input axis and the output axis are orthogonal to each other in plan view, and the pinion inserted into the gear case from the outside of the gear case on the input axis is rotated around the axis parallel to the output axis. 2. An orthogonal shaft geared motor in which an orthogonal shaft gear transmission in which an input rotation is applied to a rotating gear and a motor with a pinion provided with the pinion at a tip portion of a motor shaft is used as the motor with a pinion. The above-mentioned problems are solved by using the motor with a pinion according to any one of claims 1 to 3 and combining and integrating the motor casing of the motor with the pinion and the gear case of the orthogonal shaft gear transmission.
[0030]
According to a fifth aspect of the present invention, the pinion and the gear meshing with the pinion are hypoid gears.
[0031]
In the present invention, the shape of the pinion formed at the tip of the motor shaft is not particularly limited, but the effect is particularly effective when the pinion is not a parallel axis type pinion but an orthogonal type pinion such as a hypoid pinion. Become prominent. The reason is as described above.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0033]
FIG. 1 is a sectional view of a hypoid geared motor shown as the first embodiment of the present invention. In this geared motor, reference numeral 310 denotes a hypoid reduction gear (orthogonal shaft gear transmission), and 350 denotes a motor with a pinion.
[0034]
In this hypoid reduction gear 310, L1 is an input axis, L2 is an output axis, and these are in a relationship (twisted state) orthogonal to each other in plan view. The output shaft 313 is on the output axis L2, and an intermediate shaft 312 is disposed in parallel therewith, and a hypoid pinion 382 (corresponding to the input shaft) extending from the motor 350 in a relationship orthogonal to the intermediate shaft 312 is connected to the intermediate shaft 312. It is placed at an offset position.
[0035]
The output shaft 313 and the intermediate shaft 312 are rotatably supported by the gear case 319 by bearings 321, 322, 323, and 324, respectively. The intermediate shaft 312 is provided with a hypoid gear 315 and a gear 316, and the output shaft 313 is provided with the intermediate shaft 312. A gear 317 that meshes with the upper gear 316 is provided.
[0036]
On the other hand, the motor 350 has a motor casing 359 and a motor shaft 351, and the hypoid pinion 382 is provided at the tip of the motor shaft 351. The motor shaft 351 is supported on both ends of the motor casing 359 so as to be rotatable by two bearings 352 and 353 arranged at the front end and the rear end of the motor casing 359.
[0037]
The motor shaft 351 is separated into two in the axial direction, the front half is a pinion shaft 381, and the rear half is a main shaft (corresponding to the original motor shaft) 391. The main shaft 391 is integrated with a rotor 361 constituting a motor main mechanism portion, and is cantilevered by the bearing 353 on the rear side (before the pinion shaft 381 is mounted). The pinion shaft 381 is supported by the front-side bearing 352 at an intermediate portion in the length direction of the pinion shaft 381, and has a hypoid pinion 382 at a tip portion protruding outward from the bearing 352. The front end of the main shaft 391 and the rear end of the pinion shaft 381 are coupled by a shaft coupling 380.
[0038]
Here, as the shaft coupling 380, a fitting shaft portion 383 is provided at the rear end of the pinion shaft 381, a fitting cylinder portion 354 having a fitting hole 354 a is provided at the front end of the main shaft 391, and the fitting shaft portion 383. Is fitted into the fitting hole 354a of the fitting cylinder portion 354 via the key 390, so that the main shaft 391 and the pinion shaft 381 are interposed between the front-side bearing 352 and the rear-side bearing 353. They are joined together.
[0039]
The motor casing 359 has a rear cover 356 disposed at the rear end of the cylindrical casing 355 and a front cover 357 disposed at the front end, which are integrally coupled with a through bolt 363. 355 and the rear cover 356 constitute a main body casing 358 that constitutes a main component of the motor.
[0040]
A rear-side bearing 353 that supports the rear end of the main shaft 391 is fitted into the rear cover 356, and a front-side bearing 352 that supports the pinion shaft 381 is fitted into the front cover 357. The front-side bearing 352 is prevented from coming off by a spacer 364 coupled to the front cover 357 with a bolt 365, and the pinion shaft 381 is provided on the opposite side to the flange portion 384 that contacts the side surface of the bearing 352. A stop ring 386 provides axial positioning. A seal member 385 for sealing a penetrating portion of the pinion shaft 381 is disposed next to the bearing 352.
[0041]
Then, the axis of the motor 350 is arranged on the input axis L1 of the hypoid reduction gear 310, and the hypoid pinion 382 is inserted into the gear case 319 of the hypoid reduction gear 310 and meshed with the hypoid gear 315. The cover 357 is coupled to the gear case 319 with a bolt 399, whereby the geared motor shown in FIG.
[0042]
In the case of this geared motor, the motor shaft 351 of the motor 350 with a pinion is divided into two parts, a main shaft 391 and a pinion shaft 381, and is spliced, so the main mechanism portion of the motor including the main shaft 391 and the pinion shaft 381 Can be freely selected. That is, many types of motor main mechanisms can be freely combined with the pinion shaft 381 selected according to the hypoid reduction gear 310. Therefore, it is not necessary to process the hypoid pinion 382 for each type of motor main mechanism, and not only the processing cost and parts cost can be reduced, but also the geared motor can be delivered to the customer at a short delivery time and at a low cost.
[0043]
Also, as a configuration for that purpose, the configuration is basically the same as that of the pinion direct cutting type of FIG. 4 except that a new bearing is not added as in the known example of FIG. 5 and the shaft is separated and spliced. Therefore, it can be set as the compact structure which does not use a useless bearing.
[0044]
When changing the combination of the pinion shaft 381 side and the main shaft 391 side (the main mechanism part side of the motor), the main body casing 358 holding the main shaft 391 via the rear bearing 353 and the front bearing 352 are used. The front cover 357 that holds the pinion shaft 381 can be separated from the front cover 357 and newly coupled, so that it is possible to easily prepare various types of motors with pinions 350 and easily assemble various types of geared motors. it can.
[0045]
For example, as in the geared motor of the embodiment of FIG. 2, it is possible to easily combine the motor 450 with the brake 475, and it is also possible to easily combine motors with different capacities. In that case, only the main motor mechanism except for the front cover and the pinion shaft needs to be changed.
[0046]
Further, as shown in FIG. 3, as the shaft coupling 580, a fitting shaft portion 583 is provided at the front end of the main shaft 591 and a fitting cylinder portion 554 having a fitting hole 554a is provided at the rear end of the pinion shaft 581. The main shaft 581 and the pinion shaft 591 are connected to the front-side bearing 552 and the rear-side bearing 553 by fitting the combination shaft portion 583 into the fitting hole 554a of the fitting cylinder portion 554 via the key 590. You may make it couple | bond together.
[0047]
2 and 3, the same components as those in FIG. 1 are denoted by the same reference numerals in the last two digits in the 400s and 500s, and the description of the other components is omitted.
[0048]
In the shaft joints 380, 480, and 580, the fitting cylinder portions 354, 454, and 554 and the fitting shaft portions 383, 483 and 583 are coupled to rotate integrally using the keys 390, 490 and 590. You may combine using a spline. Alternatively, the fitting cylinder portions 354, 454, and 554 and the fitting shaft portions 383, 483, and 583 may be coupled by interference fitting such as press fitting and shrink fitting, adhesion, or a combination thereof. When they are joined by press fitting, shrink fitting, or adhesion, parts such as a key and a spline are unnecessary, so that the cost can be reduced and further downsizing can be achieved.
[0049]
In each of the above embodiments, the case where the orthogonal gear reducers are hypoid reducers 310, 410, and 510 is shown, but the same applies to the case of bevel reducers.
[0050]
Note that the parallel axis pinion itself is easy to process, and therefore has little merit from the viewpoint of the original effect of the present invention. However, the present invention does not exclude this.
[0051]
【The invention's effect】
As described above, according to the present invention, the motor shaft of a motor with a pinion is split into a main shaft and a pinion shaft, and the shaft is spliced. Therefore, the main mechanism portion of the motor including the main shaft and the pinion A combination of shafts can be freely selected.
[0052]
Therefore, it is not necessary to perform pinion processing for each type of motor main mechanism, so that processing costs and component costs can be reduced, and the geared motor can be delivered to the customer with a short delivery time and low cost.
[0053]
Moreover, the structure is basically the same as the pinion direct-cut type except that a new bearing is not added and the shaft is separated and spliced, so a compact structure that does not use unnecessary bearings. Can be realized.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a geared motor according to an embodiment of the present invention. FIG. 2 is a sectional view showing a geared motor according to another embodiment of the present invention. FIG. 3 is a sectional view showing a geared motor according to still another embodiment of the present invention. FIG. 4 is a sectional view showing an example of a conventional hypoid geared motor. FIG. 5 is a sectional view showing an example of another conventional hypoid geared motor.
310, 410, 510 ... hypoid reducer (orthogonal shaft gear transmission)
315, 415, 515 ... hypoid gear (gear)
319, 419, 519 ... Gear cases 350, 450, 550 ... Motors 351, 451, 551 with pinions ... Motor shafts 352, 452, 552 ... Front side bearings 353, 453, 553 ... Rear side bearings 354a, 454a, 554a ... fitting holes 357, 457, 557 ... front covers 358, 458, 558 ... main body casings 359, 459, 559 ... motor casings 361, 461, 561 ... rotors 380, 480, 580 ... shaft couplings 381, 481, 581 ... Pinion shafts 382, 482, 582 ... hypoid pinions 391, 491, 591 ... main shaft L1 ... input axis L2 ... output axis

Claims (5)

The motor shaft is rotatably supported by two bearings arranged at the front and rear portions of the motor casing, and an input rotation is applied to the gear transmission at the tip of the motor shaft protruding outward from the front bearing. In a motor with a pinion provided with a pinion of
The motor shaft is divided into two axially, a main shaft that is integrated with a rotor and cantilevered by the rear bearing, and a pinion shaft that has the pinion at the tip and is supported by the front bearing,
A motor with a pinion, wherein a front end of the main shaft and a rear end of the pinion shaft are coupled by a shaft coupling between the front bearing and the rear bearing. In claim 1,
The motor casing is divided into a main body casing that holds a main shaft via the rear bearing and a front cover that holds a pinion shaft via the front bearing, and the front cover is arranged at the front end of the main body casing. A motor with a pinion, characterized in that In claim 1 or 2,
As the shaft coupling, either one of the front end of the main shaft or the rear end of the pinion shaft is provided with a fitting hole for fitting the other, and the one and the other are joined by at least one of press fitting, shrink fitting, and adhesion. A motor with a pinion. The input axis line and the output axis line are orthogonal to each other in plan view, and an input rotation is applied to the gear rotating around the axis parallel to the output axis by a pinion inserted from the outside of the gear case to the inside of the gear case on the input axis. In the orthogonal shaft geared motor formed by combining the orthogonal shaft gear transmission and the motor with the pinion provided with the pinion at the tip of the motor shaft,
A motor with a pinion according to any one of claims 1 to 3 is used as the motor with a pinion, and a motor casing of the motor with a pinion and a gear case of the orthogonal shaft gear transmission are combined and integrated. A featured orthogonal shaft geared motor. In claim 4,
An orthogonal shaft geared motor, wherein the pinion and the gear meshing with the pinion are hypoid gears.

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