Orthogonal axis gear reducer
Patent Information
- Application Number
- JP2023108305
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-06-30
- Publication Date
- 2025-01-17
Smart Images
Figure 2025007115000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to an orthogonal shaft gear reducer. [Background technology]
[0002] 5 and 6 of Patent Document 1 show a worm geared motor in which a motor M2 and a two-stage worm reducer G2 are integrated. The worm reducer G2 is composed of a first-stage reduction section 400 of a parallel shaft (helical) gear mechanism and a second-stage reduction section 420 of a worm gear mechanism. The rotation of the motor shaft 280 of the motor M2 directly rotates the input shaft 340 of the first-stage reduction section 400 of the two-stage worm reducer G2, and the first stage reduction is performed by meshing between the helical pinion 440 and the helical gear 460. The rotation of the helical gear 460 is transmitted to the worm shaft 480 of the second-stage reduction section 420, and the rotation direction is changed by 90° by meshing between the worm 500 and the worm gear 520, and the second stage reduction is performed. The rotation of the worm gear 520 is directly transmitted to the input shaft of the mating machine via the output shaft 540.
[0003] 1 to 3 of the above-mentioned Patent Document 1 show a worm geared motor composed of a low-speed worm gear unit 10 and a high-speed multi-stage helical gear unit (including a motor) 20. The helical gear unit 20 includes a motor M housed in a case 40 and a reduction section 50. The reduction section 50 is composed of a motor output shaft 23, a pinion 24 at the tip of the output shaft, an intermediate stage gear 25, an intermediate stage gear pinion 26, and an output stage gear 28. A helical unit output shaft 27 protrudes to the outside.
[0004] Meanwhile, in the low-speed worm gear unit 10, the worm shaft 11 including the worm gear 12 and the output shaft 30 are housed in a case 41, and a reduction gear section 51 is built in. The worm shaft 11 is structured so that the output shaft 27 of the helical gear unit 20 is inserted and connected to it. Specifically, torque is transmitted to the key groove of the female hole machined section of the worm shaft 11 via a key 27' attached to the output shaft 27 of the helical gear unit 20.
[0005] When the output shaft 23 of the motor M rotates, the rotation is reduced and transmitted from the pinion 24 at the end to the intermediate stage gear 25, and then reduced and transmitted from the intermediate stage pinion 26 of the intermediate shaft to the output stage gear 28 of the helical gear unit output shaft 27. 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 reduced by the worm gear 12 on the worm shaft 11 and transmitted to the output shaft 30, which rotates with a predetermined torque.
[0006] The case 22 of the reduction gear portion 50 of the helical gear unit 20 and the case 42 of the motor M can be separated as necessary. Therefore, by preparing three types of helical gear units (A, B, C) for one type of worm gear unit in advance, it becomes possible to meet multiple purposes according to customer applications by selecting the helical gear unit according to the application. [Prior art documents] [Patent documents]
[0007] [Patent Document 1] JP 2006-200605 A Summary of the Invention [Problem to be solved by the invention]
[0008] When using a worm geared motor equipped with the above-mentioned worm reducer G2, it is considered necessary to prepare a plurality of worm reducers G2 with different reduction ratios in order to obtain a reduction ratio suited to a customer's application.
[0009] In addition, when using a worm gear unit 10 and a helical gear unit 20, it is possible to use one type of worm gear unit 10 and prepare multiple helical gear units 20 with different reduction ratios of the reduction section 50, and select the helical gear unit 20 according to the application.
[0010] However, when a worm geared motor with a relatively low reduction ratio is required, it is considered that there is no need to reduce the speed with the reduction section 50 of the helical gear unit 20. Nevertheless, by adding the reduction section 50, only a worm geared motor with a relatively high reduction ratio can be constructed, the reduction section 50 is costly, and the size of the entire worm geared motor is expected to increase.
[0011] In view of the above circumstances, an object of the present invention is to enable a motor and a geared motor to be selectively combined with an orthogonal shaft gear reducer. [Means for solving the problem]
[0012] In order to achieve the above object, the orthogonal axis gear reducer of the present invention is configured to be selectively combined with a motor having a solid output shaft of a motor with a pinion, and a parallel axis gear reducer having an input gear and a solid output shaft. Effect of the Invention
[0013] According to the present invention, a motor and a geared motor can be selectively combined with the orthogonal shaft gear reducer. [Brief description of the drawings]
[0014] [Figure 1] FIG. 2 is a cross-sectional view of a worm gear reducer. [Figure 2A] FIG. 2 is a side view of the input shaft of the worm gear reducer. [Figure 2B] FIG. 2 is a perspective view of an input shaft of the worm gear reducer. [Figure 3A] FIG. 2 is a cross-sectional view showing a state in which a worm gear reducer, a parallel shaft gear reducer, and a motor are combined. [Figure 3B] FIG. 2 is a cross-sectional view showing a state in which a worm gear reducer, a parallel shaft gear reducer, and a motor are combined. [Figure 4A] FIG. 2 is a cross-sectional view showing a state in which the worm gear reducer and a motor are combined. [Figure 4B]FIG. 2 is a cross-sectional view showing a state in which a worm gear reducer and a motor are combined. [Diagram 5] FIG. 11 is an explanatory diagram showing combination patterns. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0015] Hereinafter, the present invention will be described based on the illustrated embodiment, however, the present invention is not limited to the embodiment described below.
[0016] 1 shows a worm gear reducer 100, which is an example of an orthogonal shaft gear reducer. The worm gear reducer 100 includes a worm 120 and a worm wheel 130 housed in a reducer case 110. The worm 120 is rotatably supported by ball bearings 150 and 151, which are an example of bearings. The worm wheel 130 is also rotatably supported by a bearing (not shown). The worm 120 and the worm wheel 130 mesh with each other.
[0017] The worm 120 is connected to an input shaft 140 of the worm gear reducer 100. The input shaft 140 is connected to a rotation output section (an output shaft 210 of a motor 200 or an output shaft 310 of a parallel shaft gear reducer 300, which will be described later) located outside the worm gear reducer 100. When the input shaft 140 rotates, the worm 120 also rotates, causing the worm wheel 130 to rotate. As a result, the hollow output shaft 131 provided in the center of the worm wheel 130 rotates. The axial directions of the input shaft 140 and the hollow output shaft 131 are perpendicular to each other. The input shaft 140 is cylindrical and includes a hollow section 141 and an input gear section 142 formed on the outer circumferential surface.
[0018] The worm 120 and the input shaft 140 can be connected by press-fitting the connecting shaft portion 121 of the worm 120 into the hollow portion 141 of the input shaft 140. The above press-fitting may be performed after knurling the connecting shaft portion 121. The worm 120 and the input shaft 140 can also be connected by other methods including adhesive. In this case, the output side end face 144 of the input shaft 140 also serves to fix the inner ring of the ball bearing 151. Alternatively, the worm 120 and the input shaft 140 may be molded as a single unit.
[0019] 2A and 2B show the input shaft 140 connected to the worm 120 of the worm gear reducer 100. As described above, the input shaft 140 is cylindrical, and includes a hollow portion 141 and an input gear portion 142 formed on the outer circumferential surface. A key groove 141a is formed on the circumferential surface of the hollow portion 141.
[0020] The worm gear reducer 100 can be combined with a geared motor 400 comprising a parallel shaft gear reducer 300 having a solid output shaft 310 with a key (not shown) and a motor 200, as described below with reference to Figures 3A and 3B. Alternatively, the worm gear reducer 100 can be combined with a motor 200 having a solid output shaft 210 with a motor pinion 211 formed thereon, as described below with reference to Figures 4A and 4B.
[0021] <Combination with geared motor> Fig. 3A shows a state in which a geared motor 400, which is formed by combining a motor 200 and a parallel shaft gear reducer 300, is combined with the worm gear reducer 100. Fig. 3B shows a state before the motor 200, the parallel shaft gear reducer 300, and the worm gear reducer 100 are combined.
[0022] The parallel shaft gear reducer 300 includes a first gear 313 as an input section, a second gear 312 mounted on the same gear shaft as the first gear 313, a third gear 311 meshing with the second gear 312, and a solid output shaft 310 rotating integrally with the third gear 311. A motor pinion 211 formed on a motor output shaft 210 of a motor 200 meshes with the first gear 313. The motor 200 receives power from an external power source (not shown), and the motor output shaft 210 rotates. The first gear 313 meshing with the motor pinion 211 rotates at a reduced speed, and the rotation output further reduced by the second gear 312 and the third gear 311 in the parallel shaft gear reducer 300 is output from the output shaft 310 of the parallel shaft gear reducer 300.
[0023] The hollow portion 141, in which the key groove 141a is formed, of the input shaft 140 of the worm gear reducer 100 is fitted with an output shaft 310 with a key (not shown) of the parallel shaft gear reducer 300. In this way, the geared motor 400 and the worm gear reducer 100 are combined with each other based on the input shaft 140 of the worm gear reducer 100 and the output shaft 310 of the parallel shaft gear reducer 300.
[0024] In the parallel shaft gear reducer 300, a boss portion 321 that holds a bearing 323 and an oil seal 322 that support the output shaft 310 is formed so as to protrude in the output shaft direction from a flange surface (mounting surface) 320 of the parallel shaft gear reducer 300. This boss portion 321 is adapted to be accommodated in a space provided between a mounting surface 111 for mounting the geared motor 400 (parallel shaft gear reducer 300) of the worm gear reducer 100 and an input side end surface 143 of the input shaft 140.
[0025] When the output shaft 310 of the parallel shaft gear reducer 300 rotates, the worm 120 rotates, and the hollow output shaft 131 of the worm wheel 130 rotates. The axial direction of the hollow output shaft 131 is perpendicular to the axial direction of the output shaft 210 of the motor 200.
[0026] The motor 200 and the parallel shaft gear reducer 300 that constitute the geared motor 400 can be freely combined. Parallel shaft gear reducers 300 with various reduction ratios can be combined with the motor 200. Although the two-stage parallel shaft gear reducer 300 is shown in Figures 3A and 3B, another parallel shaft gear reducer with a different number of stages may also be used.
[0027] In this way, parallel shaft gear reducers 300 with various reduction ratios can be combined with the motor 200. Therefore, by changing the parallel shaft gear reducer 300 to another one, the rotation output of the worm gear reducer 100 can also be made to have a required reduction ratio.
[0028] The motor 200 and the parallel shaft gear reducer 300 can be combined based on the fit between the spigot portion 220 of the motor 200 and the spigot portion 331 of the parallel shaft gear reducer 300. The motor 200, the parallel shaft gear reducer 300, and the orthogonal shaft gear reducer 100 can then be fastened together with screws (not shown).
[0029] <Combination with motor> Fig. 4A shows a state in which the worm gear reducer 100 and the motor 200 are assembled together. Fig. 4B shows a state before the worm gear reducer 100 and the motor 200 are assembled together.
[0030] A pinion 211 of a motor output shaft 210 of the motor 200 meshes with an input gear portion 142 formed on the outer circumferential surface of an input shaft 140 connected to a worm 120 of the worm gear reducer 100. When the motor output shaft 210 rotates, the worm 120 rotates, and the hollow output shaft 131 of the worm wheel 130 rotates. The axial direction of the hollow output shaft 131 is perpendicular to the axial direction of the output shaft 210 of the motor 200.
[0031] The motor 200 and the worm gear reducer 100 are combined based on the fit between the spigot portion 220 of the motor 200 and the spigot portion 112 of the worm gear reducer 100 .
[0032] When a high reduction ratio is required for the output rotation speed of the worm gear reducer 100 relative to the rotation speed of the motor 200, this can be achieved by combining the worm gear reducer 100 with a geared motor 400, as shown in Figures 3A and 3B. In this case, the required reduction ratio can be obtained as a whole of the geared motor 400 and the worm gear reducer 100 by appropriately selecting a parallel shaft gear reducer 300 from among a number of parallel shaft gear reducers with different reduction ratios. On the other hand, if a low reduction ratio is required for the output rotation speed of the worm gear reducer 100 relative to the rotation speed of the motor 200, it can be directly combined with the motor 200 instead of the geared motor 400, as shown in Figures 4A and 4B. Since the parallel shaft gear reducer 300 is not required, miniaturization and cost reduction can be achieved.
[0033] <Drive mechanism series> The gear 313 of the input portion of the parallel shaft gear reducer 300 and the input gear portion 142 of the input shaft 140 of the worm gear reducer 100 can have the same specifications. In this case, the same motor can be used for the motor 200 indirectly combined with the worm gear reducer 100 via the parallel shaft gear reducer 300 and the motor 200 directly combined with the worm gear reducer 100. As an example, as shown in Figures 4A and 4B, a direct combination of the worm gear reducer 100 and the motor 200 may be adopted at first, but the output torque of the worm gear reducer 100 may be insufficient or further reduction in speed may be required. In this case, the parallel shaft gear reducer 300 can be added later.
[0034] As for the motor 200, various motors can be used as long as the motor pinion 211 has the same specifications. The motor may be changed to one with a different output. Alternatively, the type of motor (for example, an induction motor, a brushless DC motor, a stepping motor, a servo motor, etc.) can be changed.
[0035] 5, a common motor 200 can be used in both the combination of the worm gear reducer 100 and the geared motor 400 and the direct combination of the worm gear reducer 100 and the motor 200. Also, it is possible to configure a series of drive mechanisms including a first group consisting of a plurality of worm gear reducers (including the worm gear reducer 100) with different reduction ratios, a second group consisting of a plurality of motors (including the motor 200) with different outputs or types, and a third group consisting of a plurality of parallel shaft gear reducers (including the parallel shaft gear reducer 300) with different reduction ratios.
[0036] <Other> The motor 200 constituting the geared motor 400 and the motor directly combined with the worm gear reducer 100 may be separate motors. Furthermore, the orthogonal shaft gear reducer is not limited to the worm gear reducer 100. As the orthogonal shaft gear reducer, a screw gear reducer, a hypoid gear reducer, a bevel gear reducer, a face gear reducer, or the like may be used. Furthermore, although the hollow output shaft 131 has been shown as an example of the output shaft of the orthogonal shaft gear reducer, a solid output shaft may also be used.
[0037] <Summary> As described above, the input shaft 140 of the orthogonal shaft gear reducer has a hollow portion 141 with a key groove that fits with the reducer output shaft 310 having a key, and an input gear portion 142 formed on the outer circumferential surface and meshing with the motor output shaft 210 having the pinion 211. Therefore, an orthogonal shaft gear reducer is provided that can be combined with both a motor having a motor output shaft with a pinion and a parallel shaft gear reducer having a reducer output shaft with a key.
[0038] The input shaft of the orthogonal shaft gear reducer may be formed of separate components, a hollow input shaft portion and a gear portion. That is, two components can be prepared: a hollow input shaft portion having a hollow portion with a key groove that fits with a reducer output shaft having a key and having no gear cutting on its outer circumferential surface, and a cylindrical gear portion having gear cutting on its outer circumferential surface. Then, when combining with a motor having a motor output shaft with a pinion, the above two components can be combined by press-fitting or the like.
[0039] Furthermore, a mechanism having an input shaft having a hollow portion with a key groove that fits with a reducer output shaft having a key, and an input gear portion formed on the outer surface and meshing with a motor output shaft having a pinion, is not limited to orthogonal shaft gear reducers, and can be applied to any mechanism that transmits power using gears, such as a linear motion mechanism using a rack and pinion mechanism.
[0040] According to the embodiments described so far, the overall reduction ratio is determined by the orthogonal shaft gear reducer and the input rotation speed. When the reduction ratio of the orthogonal shaft gear reducer is the same, a high reduction ratio can be obtained by reducing the rotation speed of the motor with the parallel shaft gear reducer and inputting the reduced rotation speed to the orthogonal shaft gear reducer, while a low reduction ratio can be obtained by inputting the rotation speed of the motor directly to the orthogonal shaft gear reducer without reducing the rotation speed. In other words, the user has a wider range of options.
[0041] In addition, the orthogonal shaft gear reducer having a hollow shaft with teeth cut on the outer circumferential surface can be combined with either the parallel shaft gear reducer 300 or the motor 200 having an output shaft with a pinion. By appropriately arranging multiple orthogonal shaft gear reducers, it is possible to realize a rich series that provides various final reduction ratios between the orthogonal shaft gear reducers, parallel shaft gear reducers, and motors.
[0042] Regarding the embodiments described above, the following supplementary notes are disclosed. <Appendix 1> a motor having a solid motor output shaft with a pinion; A parallel shaft gear reducer having an input gear and a solid output shaft; An orthogonal shaft gear reducer configured to be selectively combined with the above. <Appendix 2> The input shaft of the orthogonal shaft gear reducer is It is cylindrical, a hollow portion that fits with a solid output shaft of the parallel shaft gear reducer; an outer periphery on which a gear portion that meshes with a pinion of the solid output shaft of the motor is formed; 2. The orthogonal shaft gear reducer according to claim 1, <Appendix 3> A first group including a plurality of orthogonal shaft gear reducers according to Supplementary Note 1 or 2; a second group having a plurality of motors according to appendix 1 or 2; A series of drive mechanisms equipped with <Appendix 4> 4. The series of drive mechanisms according to claim 3, further comprising a third group having a plurality of parallel shaft gear reducers according to claim 1 or 2.
[0043] Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical concept of the present invention. [Explanation of symbols]
[0044] 100 Worm gear reducer (orthogonal shaft gear reducer) 110 Gearbox case 120 Warm 130 Worm Wheel 131 Hollow output shaft 140 Input shaft 141 Hollow part 142 Input gear section 150, 151 Bearings 200 Motor 210 Output shaft 211 Pinion 300 Parallel shaft gear reducer 310 Output shaft 311, 312, 313 Gears 400 Geared Motor
Claims
1. a motor having a solid motor output shaft with a pinion; A parallel shaft gear reducer having an input gear and a solid output shaft; An orthogonal shaft gear reducer configured to be selectively combined with the above.
2. The input shaft of the orthogonal shaft gear reducer is It is cylindrical, a hollow portion that fits with a solid output shaft of the parallel shaft gear reducer; an outer periphery on which a gear portion that meshes with a pinion of the solid output shaft of the motor is formed; The orthogonal shaft gear reducer according to claim 1 .
3. A first group including a plurality of orthogonal shaft gear reducers according to claim 1 or 2; a second group including a plurality of motors according to claim 1 or 2; A series of drive mechanisms equipped with
4. 4. The series of drive mechanisms according to claim 3, further comprising a third group having a plurality of parallel shaft gear reducers according to claim 1 or 2.